From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/s390/Makefile | 9 + drivers/s390/block/Kconfig | 86 + drivers/s390/block/Makefile | 23 + drivers/s390/block/dasd.c | 4149 ++++++++++++++++++++ drivers/s390/block/dasd_3990_erp.c | 2854 ++++++++++++++ drivers/s390/block/dasd_alias.c | 976 +++++ drivers/s390/block/dasd_devmap.c | 1747 +++++++++ drivers/s390/block/dasd_diag.c | 662 ++++ drivers/s390/block/dasd_diag.h | 81 + drivers/s390/block/dasd_eckd.c | 5840 ++++++++++++++++++++++++++++ drivers/s390/block/dasd_eckd.h | 578 +++ drivers/s390/block/dasd_eer.c | 723 ++++ drivers/s390/block/dasd_erp.c | 203 + drivers/s390/block/dasd_fba.c | 835 ++++ drivers/s390/block/dasd_fba.h | 72 + drivers/s390/block/dasd_genhd.c | 191 + drivers/s390/block/dasd_int.h | 1254 ++++++ drivers/s390/block/dasd_ioctl.c | 618 +++ drivers/s390/block/dasd_proc.c | 370 ++ drivers/s390/block/dcssblk.c | 1136 ++++++ drivers/s390/block/scm_blk.c | 591 +++ drivers/s390/block/scm_blk.h | 77 + drivers/s390/block/scm_drv.c | 93 + drivers/s390/block/xpram.c | 481 +++ drivers/s390/char/Kconfig | 208 + drivers/s390/char/Makefile | 55 + drivers/s390/char/con3215.c | 1218 ++++++ drivers/s390/char/con3270.c | 649 ++++ drivers/s390/char/ctrlchar.c | 79 + drivers/s390/char/ctrlchar.h | 32 + drivers/s390/char/defkeymap.c | 161 + drivers/s390/char/defkeymap.map | 192 + drivers/s390/char/diag_ftp.c | 240 ++ drivers/s390/char/diag_ftp.h | 22 + drivers/s390/char/fs3270.c | 576 +++ drivers/s390/char/hmcdrv_cache.c | 253 ++ drivers/s390/char/hmcdrv_cache.h | 25 + drivers/s390/char/hmcdrv_dev.c | 369 ++ drivers/s390/char/hmcdrv_dev.h | 15 + drivers/s390/char/hmcdrv_ftp.c | 344 ++ drivers/s390/char/hmcdrv_ftp.h | 64 + drivers/s390/char/hmcdrv_mod.c | 64 + drivers/s390/char/keyboard.c | 579 +++ drivers/s390/char/keyboard.h | 68 + drivers/s390/char/monreader.c | 652 ++++ drivers/s390/char/monwriter.c | 399 ++ drivers/s390/char/raw3270.c | 1358 +++++++ drivers/s390/char/raw3270.h | 285 ++ drivers/s390/char/sclp.c | 1259 ++++++ drivers/s390/char/sclp.h | 348 ++ drivers/s390/char/sclp_async.c | 189 + drivers/s390/char/sclp_cmd.c | 673 ++++ drivers/s390/char/sclp_con.c | 354 ++ drivers/s390/char/sclp_config.c | 180 + drivers/s390/char/sclp_cpi_sys.c | 428 ++ drivers/s390/char/sclp_cpi_sys.h | 15 + drivers/s390/char/sclp_ctl.c | 129 + drivers/s390/char/sclp_diag.h | 90 + drivers/s390/char/sclp_early.c | 273 ++ drivers/s390/char/sclp_early_core.c | 236 ++ drivers/s390/char/sclp_ftp.c | 276 ++ drivers/s390/char/sclp_ftp.h | 22 + drivers/s390/char/sclp_ocf.c | 152 + drivers/s390/char/sclp_pci.c | 194 + drivers/s390/char/sclp_quiesce.c | 83 + drivers/s390/char/sclp_rw.c | 468 +++ drivers/s390/char/sclp_rw.h | 99 + drivers/s390/char/sclp_sd.c | 569 +++ drivers/s390/char/sclp_sdias.c | 277 ++ drivers/s390/char/sclp_sdias.h | 47 + drivers/s390/char/sclp_tty.c | 575 +++ drivers/s390/char/sclp_tty.h | 18 + drivers/s390/char/sclp_vt220.c | 898 +++++ drivers/s390/char/tape.h | 371 ++ drivers/s390/char/tape_34xx.c | 1233 ++++++ drivers/s390/char/tape_3590.c | 1702 ++++++++ drivers/s390/char/tape_3590.h | 175 + drivers/s390/char/tape_char.c | 501 +++ drivers/s390/char/tape_class.c | 132 + drivers/s390/char/tape_class.h | 59 + drivers/s390/char/tape_core.c | 1374 +++++++ drivers/s390/char/tape_proc.c | 129 + drivers/s390/char/tape_std.c | 744 ++++ drivers/s390/char/tape_std.h | 155 + drivers/s390/char/tty3270.c | 1981 ++++++++++ drivers/s390/char/tty3270.h | 15 + drivers/s390/char/vmcp.c | 274 ++ drivers/s390/char/vmlogrdr.c | 902 +++++ drivers/s390/char/vmur.c | 1058 +++++ drivers/s390/char/vmur.h | 113 + drivers/s390/char/zcore.c | 366 ++ drivers/s390/cio/Makefile | 24 + drivers/s390/cio/airq.c | 277 ++ drivers/s390/cio/blacklist.c | 424 ++ drivers/s390/cio/blacklist.h | 7 + drivers/s390/cio/ccwgroup.c | 656 ++++ drivers/s390/cio/ccwreq.c | 367 ++ drivers/s390/cio/chp.c | 834 ++++ drivers/s390/cio/chp.h | 74 + drivers/s390/cio/chsc.c | 1382 +++++++ drivers/s390/cio/chsc.h | 264 ++ drivers/s390/cio/chsc_sch.c | 1012 +++++ drivers/s390/cio/chsc_sch.h | 14 + drivers/s390/cio/cio.c | 762 ++++ drivers/s390/cio/cio.h | 149 + drivers/s390/cio/cio_debug.h | 29 + drivers/s390/cio/cmf.c | 1309 +++++++ drivers/s390/cio/crw.c | 163 + drivers/s390/cio/css.c | 1404 +++++++ drivers/s390/cio/css.h | 157 + drivers/s390/cio/device.c | 2127 ++++++++++ drivers/s390/cio/device.h | 149 + drivers/s390/cio/device_fsm.c | 1125 ++++++ drivers/s390/cio/device_id.c | 223 ++ drivers/s390/cio/device_ops.c | 715 ++++ drivers/s390/cio/device_pgid.c | 724 ++++ drivers/s390/cio/device_status.c | 399 ++ drivers/s390/cio/eadm_sch.c | 411 ++ drivers/s390/cio/eadm_sch.h | 23 + drivers/s390/cio/fcx.c | 351 ++ drivers/s390/cio/idset.c | 112 + drivers/s390/cio/idset.h | 25 + drivers/s390/cio/io_sch.h | 175 + drivers/s390/cio/ioasm.c | 276 ++ drivers/s390/cio/ioasm.h | 28 + drivers/s390/cio/isc.c | 69 + drivers/s390/cio/itcw.c | 370 ++ drivers/s390/cio/orb.h | 92 + drivers/s390/cio/qdio.h | 418 ++ drivers/s390/cio/qdio_debug.c | 372 ++ drivers/s390/cio/qdio_debug.h | 75 + drivers/s390/cio/qdio_main.c | 1873 +++++++++ drivers/s390/cio/qdio_setup.c | 595 +++ drivers/s390/cio/qdio_thinint.c | 299 ++ drivers/s390/cio/scm.c | 289 ++ drivers/s390/cio/trace.c | 25 + drivers/s390/cio/trace.h | 426 ++ drivers/s390/cio/vfio_ccw_cp.c | 882 +++++ drivers/s390/cio/vfio_ccw_cp.h | 43 + drivers/s390/cio/vfio_ccw_drv.c | 284 ++ drivers/s390/cio/vfio_ccw_fsm.c | 229 ++ drivers/s390/cio/vfio_ccw_ops.c | 435 +++ drivers/s390/cio/vfio_ccw_private.h | 97 + drivers/s390/cio/vfio_ccw_trace.h | 54 + drivers/s390/crypto/Makefile | 17 + drivers/s390/crypto/ap_bus.c | 1620 ++++++++ drivers/s390/crypto/ap_bus.h | 284 ++ drivers/s390/crypto/ap_card.c | 191 + drivers/s390/crypto/ap_debug.h | 26 + drivers/s390/crypto/ap_queue.c | 758 ++++ drivers/s390/crypto/pkey_api.c | 1227 ++++++ drivers/s390/crypto/zcrypt_api.c | 1306 +++++++ drivers/s390/crypto/zcrypt_api.h | 160 + drivers/s390/crypto/zcrypt_card.c | 189 + drivers/s390/crypto/zcrypt_cca_key.h | 250 ++ drivers/s390/crypto/zcrypt_cex2a.c | 238 ++ drivers/s390/crypto/zcrypt_cex2a.h | 136 + drivers/s390/crypto/zcrypt_cex4.c | 313 ++ drivers/s390/crypto/zcrypt_cex4.h | 13 + drivers/s390/crypto/zcrypt_debug.h | 30 + drivers/s390/crypto/zcrypt_error.h | 143 + drivers/s390/crypto/zcrypt_msgtype50.c | 560 +++ drivers/s390/crypto/zcrypt_msgtype50.h | 31 + drivers/s390/crypto/zcrypt_msgtype6.c | 1377 +++++++ drivers/s390/crypto/zcrypt_msgtype6.h | 171 + drivers/s390/crypto/zcrypt_pcixcc.c | 316 ++ drivers/s390/crypto/zcrypt_pcixcc.h | 20 + drivers/s390/crypto/zcrypt_queue.c | 228 ++ drivers/s390/net/Kconfig | 108 + drivers/s390/net/Makefile | 20 + drivers/s390/net/ctcm_dbug.c | 78 + drivers/s390/net/ctcm_dbug.h | 142 + drivers/s390/net/ctcm_fsms.c | 2300 +++++++++++ drivers/s390/net/ctcm_fsms.h | 357 ++ drivers/s390/net/ctcm_main.c | 1872 +++++++++ drivers/s390/net/ctcm_main.h | 316 ++ drivers/s390/net/ctcm_mpc.c | 2151 ++++++++++ drivers/s390/net/ctcm_mpc.h | 239 ++ drivers/s390/net/ctcm_sysfs.c | 210 + drivers/s390/net/fsm.c | 210 + drivers/s390/net/fsm.h | 266 ++ drivers/s390/net/ism.h | 221 ++ drivers/s390/net/ism_drv.c | 629 +++ drivers/s390/net/lcs.c | 2471 ++++++++++++ drivers/s390/net/lcs.h | 342 ++ drivers/s390/net/netiucv.c | 2216 +++++++++++ drivers/s390/net/qeth_core.h | 1073 +++++ drivers/s390/net/qeth_core_main.c | 6687 ++++++++++++++++++++++++++++++++ drivers/s390/net/qeth_core_mpc.c | 278 ++ drivers/s390/net/qeth_core_mpc.h | 910 +++++ drivers/s390/net/qeth_core_sys.c | 773 ++++ drivers/s390/net/qeth_l2.h | 35 + drivers/s390/net/qeth_l2_main.c | 2405 ++++++++++++ drivers/s390/net/qeth_l2_sys.c | 451 +++ drivers/s390/net/qeth_l3.h | 133 + drivers/s390/net/qeth_l3_main.c | 3000 ++++++++++++++ drivers/s390/net/qeth_l3_sys.c | 1007 +++++ drivers/s390/net/smsgiucv.c | 245 ++ drivers/s390/net/smsgiucv.h | 15 + drivers/s390/net/smsgiucv_app.c | 219 ++ drivers/s390/scsi/Makefile | 10 + drivers/s390/scsi/zfcp_aux.c | 586 +++ drivers/s390/scsi/zfcp_ccw.c | 341 ++ drivers/s390/scsi/zfcp_dbf.c | 817 ++++ drivers/s390/scsi/zfcp_dbf.h | 443 +++ drivers/s390/scsi/zfcp_def.h | 324 ++ drivers/s390/scsi/zfcp_erp.c | 1734 +++++++++ drivers/s390/scsi/zfcp_ext.h | 178 + drivers/s390/scsi/zfcp_fc.c | 1073 +++++ drivers/s390/scsi/zfcp_fc.h | 301 ++ drivers/s390/scsi/zfcp_fsf.c | 2431 ++++++++++++ drivers/s390/scsi/zfcp_fsf.h | 459 +++ drivers/s390/scsi/zfcp_qdio.c | 505 +++ drivers/s390/scsi/zfcp_qdio.h | 255 ++ drivers/s390/scsi/zfcp_reqlist.h | 212 + drivers/s390/scsi/zfcp_scsi.c | 868 +++++ drivers/s390/scsi/zfcp_sysfs.c | 666 ++++ drivers/s390/scsi/zfcp_unit.c | 263 ++ drivers/s390/virtio/Makefile | 6 + drivers/s390/virtio/virtio_ccw.c | 1467 +++++++ 220 files changed, 127712 insertions(+) create mode 100644 drivers/s390/Makefile create mode 100644 drivers/s390/block/Kconfig create mode 100644 drivers/s390/block/Makefile create mode 100644 drivers/s390/block/dasd.c create mode 100644 drivers/s390/block/dasd_3990_erp.c create mode 100644 drivers/s390/block/dasd_alias.c create mode 100644 drivers/s390/block/dasd_devmap.c create mode 100644 drivers/s390/block/dasd_diag.c create mode 100644 drivers/s390/block/dasd_diag.h create mode 100644 drivers/s390/block/dasd_eckd.c create mode 100644 drivers/s390/block/dasd_eckd.h create mode 100644 drivers/s390/block/dasd_eer.c create mode 100644 drivers/s390/block/dasd_erp.c create mode 100644 drivers/s390/block/dasd_fba.c create mode 100644 drivers/s390/block/dasd_fba.h create mode 100644 drivers/s390/block/dasd_genhd.c create mode 100644 drivers/s390/block/dasd_int.h create mode 100644 drivers/s390/block/dasd_ioctl.c create mode 100644 drivers/s390/block/dasd_proc.c create mode 100644 drivers/s390/block/dcssblk.c create mode 100644 drivers/s390/block/scm_blk.c create mode 100644 drivers/s390/block/scm_blk.h create mode 100644 drivers/s390/block/scm_drv.c create mode 100644 drivers/s390/block/xpram.c create mode 100644 drivers/s390/char/Kconfig create mode 100644 drivers/s390/char/Makefile create mode 100644 drivers/s390/char/con3215.c create mode 100644 drivers/s390/char/con3270.c create mode 100644 drivers/s390/char/ctrlchar.c create mode 100644 drivers/s390/char/ctrlchar.h create mode 100644 drivers/s390/char/defkeymap.c create mode 100644 drivers/s390/char/defkeymap.map create mode 100644 drivers/s390/char/diag_ftp.c create mode 100644 drivers/s390/char/diag_ftp.h create mode 100644 drivers/s390/char/fs3270.c create mode 100644 drivers/s390/char/hmcdrv_cache.c create mode 100644 drivers/s390/char/hmcdrv_cache.h create mode 100644 drivers/s390/char/hmcdrv_dev.c create mode 100644 drivers/s390/char/hmcdrv_dev.h create mode 100644 drivers/s390/char/hmcdrv_ftp.c create mode 100644 drivers/s390/char/hmcdrv_ftp.h create mode 100644 drivers/s390/char/hmcdrv_mod.c create mode 100644 drivers/s390/char/keyboard.c create mode 100644 drivers/s390/char/keyboard.h create mode 100644 drivers/s390/char/monreader.c create mode 100644 drivers/s390/char/monwriter.c create mode 100644 drivers/s390/char/raw3270.c create mode 100644 drivers/s390/char/raw3270.h create mode 100644 drivers/s390/char/sclp.c create mode 100644 drivers/s390/char/sclp.h create mode 100644 drivers/s390/char/sclp_async.c create mode 100644 drivers/s390/char/sclp_cmd.c create mode 100644 drivers/s390/char/sclp_con.c create mode 100644 drivers/s390/char/sclp_config.c create mode 100644 drivers/s390/char/sclp_cpi_sys.c create mode 100644 drivers/s390/char/sclp_cpi_sys.h create mode 100644 drivers/s390/char/sclp_ctl.c create mode 100644 drivers/s390/char/sclp_diag.h create mode 100644 drivers/s390/char/sclp_early.c create mode 100644 drivers/s390/char/sclp_early_core.c create mode 100644 drivers/s390/char/sclp_ftp.c create mode 100644 drivers/s390/char/sclp_ftp.h create mode 100644 drivers/s390/char/sclp_ocf.c create mode 100644 drivers/s390/char/sclp_pci.c create mode 100644 drivers/s390/char/sclp_quiesce.c create mode 100644 drivers/s390/char/sclp_rw.c create mode 100644 drivers/s390/char/sclp_rw.h create mode 100644 drivers/s390/char/sclp_sd.c create mode 100644 drivers/s390/char/sclp_sdias.c create mode 100644 drivers/s390/char/sclp_sdias.h create mode 100644 drivers/s390/char/sclp_tty.c create mode 100644 drivers/s390/char/sclp_tty.h create mode 100644 drivers/s390/char/sclp_vt220.c create mode 100644 drivers/s390/char/tape.h create mode 100644 drivers/s390/char/tape_34xx.c create mode 100644 drivers/s390/char/tape_3590.c create mode 100644 drivers/s390/char/tape_3590.h create mode 100644 drivers/s390/char/tape_char.c create mode 100644 drivers/s390/char/tape_class.c create mode 100644 drivers/s390/char/tape_class.h create mode 100644 drivers/s390/char/tape_core.c create mode 100644 drivers/s390/char/tape_proc.c create mode 100644 drivers/s390/char/tape_std.c create mode 100644 drivers/s390/char/tape_std.h create mode 100644 drivers/s390/char/tty3270.c create mode 100644 drivers/s390/char/tty3270.h create mode 100644 drivers/s390/char/vmcp.c create mode 100644 drivers/s390/char/vmlogrdr.c create mode 100644 drivers/s390/char/vmur.c create mode 100644 drivers/s390/char/vmur.h create mode 100644 drivers/s390/char/zcore.c create mode 100644 drivers/s390/cio/Makefile create mode 100644 drivers/s390/cio/airq.c create mode 100644 drivers/s390/cio/blacklist.c create mode 100644 drivers/s390/cio/blacklist.h create mode 100644 drivers/s390/cio/ccwgroup.c create mode 100644 drivers/s390/cio/ccwreq.c create mode 100644 drivers/s390/cio/chp.c create mode 100644 drivers/s390/cio/chp.h create mode 100644 drivers/s390/cio/chsc.c create mode 100644 drivers/s390/cio/chsc.h create mode 100644 drivers/s390/cio/chsc_sch.c create mode 100644 drivers/s390/cio/chsc_sch.h create mode 100644 drivers/s390/cio/cio.c create mode 100644 drivers/s390/cio/cio.h create mode 100644 drivers/s390/cio/cio_debug.h create mode 100644 drivers/s390/cio/cmf.c create mode 100644 drivers/s390/cio/crw.c create mode 100644 drivers/s390/cio/css.c create mode 100644 drivers/s390/cio/css.h create mode 100644 drivers/s390/cio/device.c create mode 100644 drivers/s390/cio/device.h create mode 100644 drivers/s390/cio/device_fsm.c create mode 100644 drivers/s390/cio/device_id.c create mode 100644 drivers/s390/cio/device_ops.c create mode 100644 drivers/s390/cio/device_pgid.c create mode 100644 drivers/s390/cio/device_status.c create mode 100644 drivers/s390/cio/eadm_sch.c create mode 100644 drivers/s390/cio/eadm_sch.h create mode 100644 drivers/s390/cio/fcx.c create mode 100644 drivers/s390/cio/idset.c create mode 100644 drivers/s390/cio/idset.h create mode 100644 drivers/s390/cio/io_sch.h create mode 100644 drivers/s390/cio/ioasm.c create mode 100644 drivers/s390/cio/ioasm.h create mode 100644 drivers/s390/cio/isc.c create mode 100644 drivers/s390/cio/itcw.c create mode 100644 drivers/s390/cio/orb.h create mode 100644 drivers/s390/cio/qdio.h create mode 100644 drivers/s390/cio/qdio_debug.c create mode 100644 drivers/s390/cio/qdio_debug.h create mode 100644 drivers/s390/cio/qdio_main.c create mode 100644 drivers/s390/cio/qdio_setup.c create mode 100644 drivers/s390/cio/qdio_thinint.c create mode 100644 drivers/s390/cio/scm.c create mode 100644 drivers/s390/cio/trace.c create mode 100644 drivers/s390/cio/trace.h create mode 100644 drivers/s390/cio/vfio_ccw_cp.c create mode 100644 drivers/s390/cio/vfio_ccw_cp.h create mode 100644 drivers/s390/cio/vfio_ccw_drv.c create mode 100644 drivers/s390/cio/vfio_ccw_fsm.c create mode 100644 drivers/s390/cio/vfio_ccw_ops.c create mode 100644 drivers/s390/cio/vfio_ccw_private.h create mode 100644 drivers/s390/cio/vfio_ccw_trace.h create mode 100644 drivers/s390/crypto/Makefile create mode 100644 drivers/s390/crypto/ap_bus.c create mode 100644 drivers/s390/crypto/ap_bus.h create mode 100644 drivers/s390/crypto/ap_card.c create mode 100644 drivers/s390/crypto/ap_debug.h create mode 100644 drivers/s390/crypto/ap_queue.c create mode 100644 drivers/s390/crypto/pkey_api.c create mode 100644 drivers/s390/crypto/zcrypt_api.c create mode 100644 drivers/s390/crypto/zcrypt_api.h create mode 100644 drivers/s390/crypto/zcrypt_card.c create mode 100644 drivers/s390/crypto/zcrypt_cca_key.h create mode 100644 drivers/s390/crypto/zcrypt_cex2a.c create mode 100644 drivers/s390/crypto/zcrypt_cex2a.h create mode 100644 drivers/s390/crypto/zcrypt_cex4.c create mode 100644 drivers/s390/crypto/zcrypt_cex4.h create mode 100644 drivers/s390/crypto/zcrypt_debug.h create mode 100644 drivers/s390/crypto/zcrypt_error.h create mode 100644 drivers/s390/crypto/zcrypt_msgtype50.c create mode 100644 drivers/s390/crypto/zcrypt_msgtype50.h create mode 100644 drivers/s390/crypto/zcrypt_msgtype6.c create mode 100644 drivers/s390/crypto/zcrypt_msgtype6.h create mode 100644 drivers/s390/crypto/zcrypt_pcixcc.c create mode 100644 drivers/s390/crypto/zcrypt_pcixcc.h create mode 100644 drivers/s390/crypto/zcrypt_queue.c create mode 100644 drivers/s390/net/Kconfig create mode 100644 drivers/s390/net/Makefile create mode 100644 drivers/s390/net/ctcm_dbug.c create mode 100644 drivers/s390/net/ctcm_dbug.h create mode 100644 drivers/s390/net/ctcm_fsms.c create mode 100644 drivers/s390/net/ctcm_fsms.h create mode 100644 drivers/s390/net/ctcm_main.c create mode 100644 drivers/s390/net/ctcm_main.h create mode 100644 drivers/s390/net/ctcm_mpc.c create mode 100644 drivers/s390/net/ctcm_mpc.h create mode 100644 drivers/s390/net/ctcm_sysfs.c create mode 100644 drivers/s390/net/fsm.c create mode 100644 drivers/s390/net/fsm.h create mode 100644 drivers/s390/net/ism.h create mode 100644 drivers/s390/net/ism_drv.c create mode 100644 drivers/s390/net/lcs.c create mode 100644 drivers/s390/net/lcs.h create mode 100644 drivers/s390/net/netiucv.c create mode 100644 drivers/s390/net/qeth_core.h create mode 100644 drivers/s390/net/qeth_core_main.c create mode 100644 drivers/s390/net/qeth_core_mpc.c create mode 100644 drivers/s390/net/qeth_core_mpc.h create mode 100644 drivers/s390/net/qeth_core_sys.c create mode 100644 drivers/s390/net/qeth_l2.h create mode 100644 drivers/s390/net/qeth_l2_main.c create mode 100644 drivers/s390/net/qeth_l2_sys.c create mode 100644 drivers/s390/net/qeth_l3.h create mode 100644 drivers/s390/net/qeth_l3_main.c create mode 100644 drivers/s390/net/qeth_l3_sys.c create mode 100644 drivers/s390/net/smsgiucv.c create mode 100644 drivers/s390/net/smsgiucv.h create mode 100644 drivers/s390/net/smsgiucv_app.c create mode 100644 drivers/s390/scsi/Makefile create mode 100644 drivers/s390/scsi/zfcp_aux.c create mode 100644 drivers/s390/scsi/zfcp_ccw.c create mode 100644 drivers/s390/scsi/zfcp_dbf.c create mode 100644 drivers/s390/scsi/zfcp_dbf.h create mode 100644 drivers/s390/scsi/zfcp_def.h create mode 100644 drivers/s390/scsi/zfcp_erp.c create mode 100644 drivers/s390/scsi/zfcp_ext.h create mode 100644 drivers/s390/scsi/zfcp_fc.c create mode 100644 drivers/s390/scsi/zfcp_fc.h create mode 100644 drivers/s390/scsi/zfcp_fsf.c create mode 100644 drivers/s390/scsi/zfcp_fsf.h create mode 100644 drivers/s390/scsi/zfcp_qdio.c create mode 100644 drivers/s390/scsi/zfcp_qdio.h create mode 100644 drivers/s390/scsi/zfcp_reqlist.h create mode 100644 drivers/s390/scsi/zfcp_scsi.c create mode 100644 drivers/s390/scsi/zfcp_sysfs.c create mode 100644 drivers/s390/scsi/zfcp_unit.c create mode 100644 drivers/s390/virtio/Makefile create mode 100644 drivers/s390/virtio/virtio_ccw.c (limited to 'drivers/s390') diff --git a/drivers/s390/Makefile b/drivers/s390/Makefile new file mode 100644 index 000000000..a863b0462 --- /dev/null +++ b/drivers/s390/Makefile @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the S/390 specific device drivers +# + +obj-y += cio/ block/ char/ crypto/ net/ scsi/ virtio/ + +drivers-y += drivers/s390/built-in.a + diff --git a/drivers/s390/block/Kconfig b/drivers/s390/block/Kconfig new file mode 100644 index 000000000..9ac7574e3 --- /dev/null +++ b/drivers/s390/block/Kconfig @@ -0,0 +1,86 @@ +# SPDX-License-Identifier: GPL-2.0 +comment "S/390 block device drivers" + depends on S390 && BLOCK + +config BLK_DEV_XPRAM + def_tristate m + prompt "XPRAM disk support" + depends on S390 && BLOCK + help + Select this option if you want to use your expanded storage on S/390 + or zSeries as a disk. This is useful as a _fast_ swap device if you + want to access more than 2G of memory when running in 31 bit mode. + This option is also available as a module which will be called + xpram. If unsure, say "N". + +config DCSSBLK + def_tristate m + select FS_DAX_LIMITED + select DAX_DRIVER + prompt "DCSSBLK support" + depends on S390 && BLOCK + help + Support for dcss block device + +config DASD + def_tristate y + prompt "Support for DASD devices" + depends on CCW && BLOCK + select IOSCHED_DEADLINE + help + Enable this option if you want to access DASDs directly utilizing + S/390s channel subsystem commands. This is necessary for running + natively on a single image or an LPAR. + +config DASD_PROFILE + def_bool y + prompt "Profiling support for dasd devices" + depends on DASD + help + Enable this option if you want to see profiling information + in /proc/dasd/statistics. + +config DASD_ECKD + def_tristate y + prompt "Support for ECKD Disks" + depends on DASD + help + ECKD devices are the most commonly used devices. You should enable + this option unless you are very sure to have no ECKD device. + +config DASD_FBA + def_tristate y + prompt "Support for FBA Disks" + depends on DASD + help + Select this option to be able to access FBA devices. It is safe to + say "Y". + +config DASD_DIAG + def_tristate y + prompt "Support for DIAG access to Disks" + depends on DASD + help + Select this option if you want to use Diagnose250 command to access + Disks under VM. If you are not running under VM or unsure what it is, + say "N". + +config DASD_EER + def_bool y + prompt "Extended error reporting (EER)" + depends on DASD + help + This driver provides a character device interface to the + DASD extended error reporting. This is only needed if you want to + use applications written for the EER facility. + +config SCM_BLOCK + def_tristate m + prompt "Support for Storage Class Memory" + depends on S390 && BLOCK && EADM_SCH && SCM_BUS + help + Block device driver for Storage Class Memory (SCM). This driver + provides a block device interface for each available SCM increment. + + To compile this driver as a module, choose M here: the + module will be called scm_block. diff --git a/drivers/s390/block/Makefile b/drivers/s390/block/Makefile new file mode 100644 index 000000000..60c85cff5 --- /dev/null +++ b/drivers/s390/block/Makefile @@ -0,0 +1,23 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# S/390 block devices +# + +dasd_eckd_mod-objs := dasd_eckd.o dasd_3990_erp.o dasd_alias.o +dasd_fba_mod-objs := dasd_fba.o +dasd_diag_mod-objs := dasd_diag.o +dasd_mod-objs := dasd.o dasd_ioctl.o dasd_proc.o dasd_devmap.o \ + dasd_genhd.o dasd_erp.o +ifdef CONFIG_DASD_EER +dasd_mod-objs += dasd_eer.o +endif + +obj-$(CONFIG_DASD) += dasd_mod.o +obj-$(CONFIG_DASD_DIAG) += dasd_diag_mod.o +obj-$(CONFIG_DASD_ECKD) += dasd_eckd_mod.o +obj-$(CONFIG_DASD_FBA) += dasd_fba_mod.o +obj-$(CONFIG_BLK_DEV_XPRAM) += xpram.o +obj-$(CONFIG_DCSSBLK) += dcssblk.o + +scm_block-objs := scm_drv.o scm_blk.o +obj-$(CONFIG_SCM_BLOCK) += scm_block.o diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c new file mode 100644 index 000000000..7beda20cf --- /dev/null +++ b/drivers/s390/block/dasd.c @@ -0,0 +1,4149 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Holger Smolinski + * Horst Hummel + * Carsten Otte + * Martin Schwidefsky + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2009 + */ + +#define KMSG_COMPONENT "dasd" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +/* This is ugly... */ +#define PRINTK_HEADER "dasd:" + +#include "dasd_int.h" +/* + * SECTION: Constant definitions to be used within this file + */ +#define DASD_CHANQ_MAX_SIZE 4 + +#define DASD_DIAG_MOD "dasd_diag_mod" + +static unsigned int queue_depth = 32; +static unsigned int nr_hw_queues = 4; + +module_param(queue_depth, uint, 0444); +MODULE_PARM_DESC(queue_depth, "Default queue depth for new DASD devices"); + +module_param(nr_hw_queues, uint, 0444); +MODULE_PARM_DESC(nr_hw_queues, "Default number of hardware queues for new DASD devices"); + +/* + * SECTION: exported variables of dasd.c + */ +debug_info_t *dasd_debug_area; +EXPORT_SYMBOL(dasd_debug_area); +static struct dentry *dasd_debugfs_root_entry; +struct dasd_discipline *dasd_diag_discipline_pointer; +EXPORT_SYMBOL(dasd_diag_discipline_pointer); +void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); + +MODULE_AUTHOR("Holger Smolinski "); +MODULE_DESCRIPTION("Linux on S/390 DASD device driver," + " Copyright IBM Corp. 2000"); +MODULE_SUPPORTED_DEVICE("dasd"); +MODULE_LICENSE("GPL"); + +/* + * SECTION: prototypes for static functions of dasd.c + */ +static int dasd_alloc_queue(struct dasd_block *); +static void dasd_setup_queue(struct dasd_block *); +static void dasd_free_queue(struct dasd_block *); +static int dasd_flush_block_queue(struct dasd_block *); +static void dasd_device_tasklet(unsigned long); +static void dasd_block_tasklet(unsigned long); +static void do_kick_device(struct work_struct *); +static void do_restore_device(struct work_struct *); +static void do_reload_device(struct work_struct *); +static void do_requeue_requests(struct work_struct *); +static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); +static void dasd_device_timeout(struct timer_list *); +static void dasd_block_timeout(struct timer_list *); +static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); +static void dasd_profile_init(struct dasd_profile *, struct dentry *); +static void dasd_profile_exit(struct dasd_profile *); +static void dasd_hosts_init(struct dentry *, struct dasd_device *); +static void dasd_hosts_exit(struct dasd_device *); + +/* + * SECTION: Operations on the device structure. + */ +static wait_queue_head_t dasd_init_waitq; +static wait_queue_head_t dasd_flush_wq; +static wait_queue_head_t generic_waitq; +static wait_queue_head_t shutdown_waitq; + +/* + * Allocate memory for a new device structure. + */ +struct dasd_device *dasd_alloc_device(void) +{ + struct dasd_device *device; + + device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); + if (!device) + return ERR_PTR(-ENOMEM); + + /* Get two pages for normal block device operations. */ + device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); + if (!device->ccw_mem) { + kfree(device); + return ERR_PTR(-ENOMEM); + } + /* Get one page for error recovery. */ + device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); + if (!device->erp_mem) { + free_pages((unsigned long) device->ccw_mem, 1); + kfree(device); + return ERR_PTR(-ENOMEM); + } + + dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); + dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); + spin_lock_init(&device->mem_lock); + atomic_set(&device->tasklet_scheduled, 0); + tasklet_init(&device->tasklet, dasd_device_tasklet, + (unsigned long) device); + INIT_LIST_HEAD(&device->ccw_queue); + timer_setup(&device->timer, dasd_device_timeout, 0); + INIT_WORK(&device->kick_work, do_kick_device); + INIT_WORK(&device->restore_device, do_restore_device); + INIT_WORK(&device->reload_device, do_reload_device); + INIT_WORK(&device->requeue_requests, do_requeue_requests); + device->state = DASD_STATE_NEW; + device->target = DASD_STATE_NEW; + mutex_init(&device->state_mutex); + spin_lock_init(&device->profile.lock); + return device; +} + +/* + * Free memory of a device structure. + */ +void dasd_free_device(struct dasd_device *device) +{ + kfree(device->private); + free_page((unsigned long) device->erp_mem); + free_pages((unsigned long) device->ccw_mem, 1); + kfree(device); +} + +/* + * Allocate memory for a new device structure. + */ +struct dasd_block *dasd_alloc_block(void) +{ + struct dasd_block *block; + + block = kzalloc(sizeof(*block), GFP_ATOMIC); + if (!block) + return ERR_PTR(-ENOMEM); + /* open_count = 0 means device online but not in use */ + atomic_set(&block->open_count, -1); + + atomic_set(&block->tasklet_scheduled, 0); + tasklet_init(&block->tasklet, dasd_block_tasklet, + (unsigned long) block); + INIT_LIST_HEAD(&block->ccw_queue); + spin_lock_init(&block->queue_lock); + timer_setup(&block->timer, dasd_block_timeout, 0); + spin_lock_init(&block->profile.lock); + + return block; +} +EXPORT_SYMBOL_GPL(dasd_alloc_block); + +/* + * Free memory of a device structure. + */ +void dasd_free_block(struct dasd_block *block) +{ + kfree(block); +} +EXPORT_SYMBOL_GPL(dasd_free_block); + +/* + * Make a new device known to the system. + */ +static int dasd_state_new_to_known(struct dasd_device *device) +{ + int rc; + + /* + * As long as the device is not in state DASD_STATE_NEW we want to + * keep the reference count > 0. + */ + dasd_get_device(device); + + if (device->block) { + rc = dasd_alloc_queue(device->block); + if (rc) { + dasd_put_device(device); + return rc; + } + } + device->state = DASD_STATE_KNOWN; + return 0; +} + +/* + * Let the system forget about a device. + */ +static int dasd_state_known_to_new(struct dasd_device *device) +{ + /* Disable extended error reporting for this device. */ + dasd_eer_disable(device); + device->state = DASD_STATE_NEW; + + if (device->block) + dasd_free_queue(device->block); + + /* Give up reference we took in dasd_state_new_to_known. */ + dasd_put_device(device); + return 0; +} + +static struct dentry *dasd_debugfs_setup(const char *name, + struct dentry *base_dentry) +{ + struct dentry *pde; + + if (!base_dentry) + return NULL; + pde = debugfs_create_dir(name, base_dentry); + if (!pde || IS_ERR(pde)) + return NULL; + return pde; +} + +/* + * Request the irq line for the device. + */ +static int dasd_state_known_to_basic(struct dasd_device *device) +{ + struct dasd_block *block = device->block; + int rc = 0; + + /* Allocate and register gendisk structure. */ + if (block) { + rc = dasd_gendisk_alloc(block); + if (rc) + return rc; + block->debugfs_dentry = + dasd_debugfs_setup(block->gdp->disk_name, + dasd_debugfs_root_entry); + dasd_profile_init(&block->profile, block->debugfs_dentry); + if (dasd_global_profile_level == DASD_PROFILE_ON) + dasd_profile_on(&device->block->profile); + } + device->debugfs_dentry = + dasd_debugfs_setup(dev_name(&device->cdev->dev), + dasd_debugfs_root_entry); + dasd_profile_init(&device->profile, device->debugfs_dentry); + dasd_hosts_init(device->debugfs_dentry, device); + + /* register 'device' debug area, used for all DBF_DEV_XXX calls */ + device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, + 8 * sizeof(long)); + debug_register_view(device->debug_area, &debug_sprintf_view); + debug_set_level(device->debug_area, DBF_WARNING); + DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); + + device->state = DASD_STATE_BASIC; + + return rc; +} + +/* + * Release the irq line for the device. Terminate any running i/o. + */ +static int dasd_state_basic_to_known(struct dasd_device *device) +{ + int rc; + + if (device->discipline->basic_to_known) { + rc = device->discipline->basic_to_known(device); + if (rc) + return rc; + } + + if (device->block) { + dasd_profile_exit(&device->block->profile); + debugfs_remove(device->block->debugfs_dentry); + dasd_gendisk_free(device->block); + dasd_block_clear_timer(device->block); + } + rc = dasd_flush_device_queue(device); + if (rc) + return rc; + dasd_device_clear_timer(device); + dasd_profile_exit(&device->profile); + dasd_hosts_exit(device); + debugfs_remove(device->debugfs_dentry); + DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); + if (device->debug_area != NULL) { + debug_unregister(device->debug_area); + device->debug_area = NULL; + } + device->state = DASD_STATE_KNOWN; + return 0; +} + +/* + * Do the initial analysis. The do_analysis function may return + * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC + * until the discipline decides to continue the startup sequence + * by calling the function dasd_change_state. The eckd disciplines + * uses this to start a ccw that detects the format. The completion + * interrupt for this detection ccw uses the kernel event daemon to + * trigger the call to dasd_change_state. All this is done in the + * discipline code, see dasd_eckd.c. + * After the analysis ccw is done (do_analysis returned 0) the block + * device is setup. + * In case the analysis returns an error, the device setup is stopped + * (a fake disk was already added to allow formatting). + */ +static int dasd_state_basic_to_ready(struct dasd_device *device) +{ + int rc; + struct dasd_block *block; + struct gendisk *disk; + + rc = 0; + block = device->block; + /* make disk known with correct capacity */ + if (block) { + if (block->base->discipline->do_analysis != NULL) + rc = block->base->discipline->do_analysis(block); + if (rc) { + if (rc != -EAGAIN) { + device->state = DASD_STATE_UNFMT; + disk = device->block->gdp; + kobject_uevent(&disk_to_dev(disk)->kobj, + KOBJ_CHANGE); + goto out; + } + return rc; + } + dasd_setup_queue(block); + set_capacity(block->gdp, + block->blocks << block->s2b_shift); + device->state = DASD_STATE_READY; + rc = dasd_scan_partitions(block); + if (rc) { + device->state = DASD_STATE_BASIC; + return rc; + } + } else { + device->state = DASD_STATE_READY; + } +out: + if (device->discipline->basic_to_ready) + rc = device->discipline->basic_to_ready(device); + return rc; +} + +static inline +int _wait_for_empty_queues(struct dasd_device *device) +{ + if (device->block) + return list_empty(&device->ccw_queue) && + list_empty(&device->block->ccw_queue); + else + return list_empty(&device->ccw_queue); +} + +/* + * Remove device from block device layer. Destroy dirty buffers. + * Forget format information. Check if the target level is basic + * and if it is create fake disk for formatting. + */ +static int dasd_state_ready_to_basic(struct dasd_device *device) +{ + int rc; + + device->state = DASD_STATE_BASIC; + if (device->block) { + struct dasd_block *block = device->block; + rc = dasd_flush_block_queue(block); + if (rc) { + device->state = DASD_STATE_READY; + return rc; + } + dasd_destroy_partitions(block); + block->blocks = 0; + block->bp_block = 0; + block->s2b_shift = 0; + } + return 0; +} + +/* + * Back to basic. + */ +static int dasd_state_unfmt_to_basic(struct dasd_device *device) +{ + device->state = DASD_STATE_BASIC; + return 0; +} + +/* + * Make the device online and schedule the bottom half to start + * the requeueing of requests from the linux request queue to the + * ccw queue. + */ +static int +dasd_state_ready_to_online(struct dasd_device * device) +{ + struct gendisk *disk; + struct disk_part_iter piter; + struct hd_struct *part; + + device->state = DASD_STATE_ONLINE; + if (device->block) { + dasd_schedule_block_bh(device->block); + if ((device->features & DASD_FEATURE_USERAW)) { + disk = device->block->gdp; + kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); + return 0; + } + disk = device->block->bdev->bd_disk; + disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); + while ((part = disk_part_iter_next(&piter))) + kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); + disk_part_iter_exit(&piter); + } + return 0; +} + +/* + * Stop the requeueing of requests again. + */ +static int dasd_state_online_to_ready(struct dasd_device *device) +{ + int rc; + struct gendisk *disk; + struct disk_part_iter piter; + struct hd_struct *part; + + if (device->discipline->online_to_ready) { + rc = device->discipline->online_to_ready(device); + if (rc) + return rc; + } + + device->state = DASD_STATE_READY; + if (device->block && !(device->features & DASD_FEATURE_USERAW)) { + disk = device->block->bdev->bd_disk; + disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); + while ((part = disk_part_iter_next(&piter))) + kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); + disk_part_iter_exit(&piter); + } + return 0; +} + +/* + * Device startup state changes. + */ +static int dasd_increase_state(struct dasd_device *device) +{ + int rc; + + rc = 0; + if (device->state == DASD_STATE_NEW && + device->target >= DASD_STATE_KNOWN) + rc = dasd_state_new_to_known(device); + + if (!rc && + device->state == DASD_STATE_KNOWN && + device->target >= DASD_STATE_BASIC) + rc = dasd_state_known_to_basic(device); + + if (!rc && + device->state == DASD_STATE_BASIC && + device->target >= DASD_STATE_READY) + rc = dasd_state_basic_to_ready(device); + + if (!rc && + device->state == DASD_STATE_UNFMT && + device->target > DASD_STATE_UNFMT) + rc = -EPERM; + + if (!rc && + device->state == DASD_STATE_READY && + device->target >= DASD_STATE_ONLINE) + rc = dasd_state_ready_to_online(device); + + return rc; +} + +/* + * Device shutdown state changes. + */ +static int dasd_decrease_state(struct dasd_device *device) +{ + int rc; + + rc = 0; + if (device->state == DASD_STATE_ONLINE && + device->target <= DASD_STATE_READY) + rc = dasd_state_online_to_ready(device); + + if (!rc && + device->state == DASD_STATE_READY && + device->target <= DASD_STATE_BASIC) + rc = dasd_state_ready_to_basic(device); + + if (!rc && + device->state == DASD_STATE_UNFMT && + device->target <= DASD_STATE_BASIC) + rc = dasd_state_unfmt_to_basic(device); + + if (!rc && + device->state == DASD_STATE_BASIC && + device->target <= DASD_STATE_KNOWN) + rc = dasd_state_basic_to_known(device); + + if (!rc && + device->state == DASD_STATE_KNOWN && + device->target <= DASD_STATE_NEW) + rc = dasd_state_known_to_new(device); + + return rc; +} + +/* + * This is the main startup/shutdown routine. + */ +static void dasd_change_state(struct dasd_device *device) +{ + int rc; + + if (device->state == device->target) + /* Already where we want to go today... */ + return; + if (device->state < device->target) + rc = dasd_increase_state(device); + else + rc = dasd_decrease_state(device); + if (rc == -EAGAIN) + return; + if (rc) + device->target = device->state; + + /* let user-space know that the device status changed */ + kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); + + if (device->state == device->target) + wake_up(&dasd_init_waitq); +} + +/* + * Kick starter for devices that did not complete the startup/shutdown + * procedure or were sleeping because of a pending state. + * dasd_kick_device will schedule a call do do_kick_device to the kernel + * event daemon. + */ +static void do_kick_device(struct work_struct *work) +{ + struct dasd_device *device = container_of(work, struct dasd_device, kick_work); + mutex_lock(&device->state_mutex); + dasd_change_state(device); + mutex_unlock(&device->state_mutex); + dasd_schedule_device_bh(device); + dasd_put_device(device); +} + +void dasd_kick_device(struct dasd_device *device) +{ + dasd_get_device(device); + /* queue call to dasd_kick_device to the kernel event daemon. */ + if (!schedule_work(&device->kick_work)) + dasd_put_device(device); +} +EXPORT_SYMBOL(dasd_kick_device); + +/* + * dasd_reload_device will schedule a call do do_reload_device to the kernel + * event daemon. + */ +static void do_reload_device(struct work_struct *work) +{ + struct dasd_device *device = container_of(work, struct dasd_device, + reload_device); + device->discipline->reload(device); + dasd_put_device(device); +} + +void dasd_reload_device(struct dasd_device *device) +{ + dasd_get_device(device); + /* queue call to dasd_reload_device to the kernel event daemon. */ + if (!schedule_work(&device->reload_device)) + dasd_put_device(device); +} +EXPORT_SYMBOL(dasd_reload_device); + +/* + * dasd_restore_device will schedule a call do do_restore_device to the kernel + * event daemon. + */ +static void do_restore_device(struct work_struct *work) +{ + struct dasd_device *device = container_of(work, struct dasd_device, + restore_device); + device->cdev->drv->restore(device->cdev); + dasd_put_device(device); +} + +void dasd_restore_device(struct dasd_device *device) +{ + dasd_get_device(device); + /* queue call to dasd_restore_device to the kernel event daemon. */ + if (!schedule_work(&device->restore_device)) + dasd_put_device(device); +} + +/* + * Set the target state for a device and starts the state change. + */ +void dasd_set_target_state(struct dasd_device *device, int target) +{ + dasd_get_device(device); + mutex_lock(&device->state_mutex); + /* If we are in probeonly mode stop at DASD_STATE_READY. */ + if (dasd_probeonly && target > DASD_STATE_READY) + target = DASD_STATE_READY; + if (device->target != target) { + if (device->state == target) + wake_up(&dasd_init_waitq); + device->target = target; + } + if (device->state != device->target) + dasd_change_state(device); + mutex_unlock(&device->state_mutex); + dasd_put_device(device); +} +EXPORT_SYMBOL(dasd_set_target_state); + +/* + * Enable devices with device numbers in [from..to]. + */ +static inline int _wait_for_device(struct dasd_device *device) +{ + return (device->state == device->target); +} + +void dasd_enable_device(struct dasd_device *device) +{ + dasd_set_target_state(device, DASD_STATE_ONLINE); + if (device->state <= DASD_STATE_KNOWN) + /* No discipline for device found. */ + dasd_set_target_state(device, DASD_STATE_NEW); + /* Now wait for the devices to come up. */ + wait_event(dasd_init_waitq, _wait_for_device(device)); + + dasd_reload_device(device); + if (device->discipline->kick_validate) + device->discipline->kick_validate(device); +} +EXPORT_SYMBOL(dasd_enable_device); + +/* + * SECTION: device operation (interrupt handler, start i/o, term i/o ...) + */ + +unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; + +#ifdef CONFIG_DASD_PROFILE +struct dasd_profile dasd_global_profile = { + .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock), +}; +static struct dentry *dasd_debugfs_global_entry; + +/* + * Add profiling information for cqr before execution. + */ +static void dasd_profile_start(struct dasd_block *block, + struct dasd_ccw_req *cqr, + struct request *req) +{ + struct list_head *l; + unsigned int counter; + struct dasd_device *device; + + /* count the length of the chanq for statistics */ + counter = 0; + if (dasd_global_profile_level || block->profile.data) + list_for_each(l, &block->ccw_queue) + if (++counter >= 31) + break; + + spin_lock(&dasd_global_profile.lock); + if (dasd_global_profile.data) { + dasd_global_profile.data->dasd_io_nr_req[counter]++; + if (rq_data_dir(req) == READ) + dasd_global_profile.data->dasd_read_nr_req[counter]++; + } + spin_unlock(&dasd_global_profile.lock); + + spin_lock(&block->profile.lock); + if (block->profile.data) { + block->profile.data->dasd_io_nr_req[counter]++; + if (rq_data_dir(req) == READ) + block->profile.data->dasd_read_nr_req[counter]++; + } + spin_unlock(&block->profile.lock); + + /* + * We count the request for the start device, even though it may run on + * some other device due to error recovery. This way we make sure that + * we count each request only once. + */ + device = cqr->startdev; + if (device->profile.data) { + counter = 1; /* request is not yet queued on the start device */ + list_for_each(l, &device->ccw_queue) + if (++counter >= 31) + break; + } + spin_lock(&device->profile.lock); + if (device->profile.data) { + device->profile.data->dasd_io_nr_req[counter]++; + if (rq_data_dir(req) == READ) + device->profile.data->dasd_read_nr_req[counter]++; + } + spin_unlock(&device->profile.lock); +} + +/* + * Add profiling information for cqr after execution. + */ + +#define dasd_profile_counter(value, index) \ +{ \ + for (index = 0; index < 31 && value >> (2+index); index++) \ + ; \ +} + +static void dasd_profile_end_add_data(struct dasd_profile_info *data, + int is_alias, + int is_tpm, + int is_read, + long sectors, + int sectors_ind, + int tottime_ind, + int tottimeps_ind, + int strtime_ind, + int irqtime_ind, + int irqtimeps_ind, + int endtime_ind) +{ + /* in case of an overflow, reset the whole profile */ + if (data->dasd_io_reqs == UINT_MAX) { + memset(data, 0, sizeof(*data)); + ktime_get_real_ts64(&data->starttod); + } + data->dasd_io_reqs++; + data->dasd_io_sects += sectors; + if (is_alias) + data->dasd_io_alias++; + if (is_tpm) + data->dasd_io_tpm++; + + data->dasd_io_secs[sectors_ind]++; + data->dasd_io_times[tottime_ind]++; + data->dasd_io_timps[tottimeps_ind]++; + data->dasd_io_time1[strtime_ind]++; + data->dasd_io_time2[irqtime_ind]++; + data->dasd_io_time2ps[irqtimeps_ind]++; + data->dasd_io_time3[endtime_ind]++; + + if (is_read) { + data->dasd_read_reqs++; + data->dasd_read_sects += sectors; + if (is_alias) + data->dasd_read_alias++; + if (is_tpm) + data->dasd_read_tpm++; + data->dasd_read_secs[sectors_ind]++; + data->dasd_read_times[tottime_ind]++; + data->dasd_read_time1[strtime_ind]++; + data->dasd_read_time2[irqtime_ind]++; + data->dasd_read_time3[endtime_ind]++; + } +} + +static void dasd_profile_end(struct dasd_block *block, + struct dasd_ccw_req *cqr, + struct request *req) +{ + unsigned long strtime, irqtime, endtime, tottime; + unsigned long tottimeps, sectors; + struct dasd_device *device; + int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; + int irqtime_ind, irqtimeps_ind, endtime_ind; + struct dasd_profile_info *data; + + device = cqr->startdev; + if (!(dasd_global_profile_level || + block->profile.data || + device->profile.data)) + return; + + sectors = blk_rq_sectors(req); + if (!cqr->buildclk || !cqr->startclk || + !cqr->stopclk || !cqr->endclk || + !sectors) + return; + + strtime = ((cqr->startclk - cqr->buildclk) >> 12); + irqtime = ((cqr->stopclk - cqr->startclk) >> 12); + endtime = ((cqr->endclk - cqr->stopclk) >> 12); + tottime = ((cqr->endclk - cqr->buildclk) >> 12); + tottimeps = tottime / sectors; + + dasd_profile_counter(sectors, sectors_ind); + dasd_profile_counter(tottime, tottime_ind); + dasd_profile_counter(tottimeps, tottimeps_ind); + dasd_profile_counter(strtime, strtime_ind); + dasd_profile_counter(irqtime, irqtime_ind); + dasd_profile_counter(irqtime / sectors, irqtimeps_ind); + dasd_profile_counter(endtime, endtime_ind); + + spin_lock(&dasd_global_profile.lock); + if (dasd_global_profile.data) { + data = dasd_global_profile.data; + data->dasd_sum_times += tottime; + data->dasd_sum_time_str += strtime; + data->dasd_sum_time_irq += irqtime; + data->dasd_sum_time_end += endtime; + dasd_profile_end_add_data(dasd_global_profile.data, + cqr->startdev != block->base, + cqr->cpmode == 1, + rq_data_dir(req) == READ, + sectors, sectors_ind, tottime_ind, + tottimeps_ind, strtime_ind, + irqtime_ind, irqtimeps_ind, + endtime_ind); + } + spin_unlock(&dasd_global_profile.lock); + + spin_lock(&block->profile.lock); + if (block->profile.data) { + data = block->profile.data; + data->dasd_sum_times += tottime; + data->dasd_sum_time_str += strtime; + data->dasd_sum_time_irq += irqtime; + data->dasd_sum_time_end += endtime; + dasd_profile_end_add_data(block->profile.data, + cqr->startdev != block->base, + cqr->cpmode == 1, + rq_data_dir(req) == READ, + sectors, sectors_ind, tottime_ind, + tottimeps_ind, strtime_ind, + irqtime_ind, irqtimeps_ind, + endtime_ind); + } + spin_unlock(&block->profile.lock); + + spin_lock(&device->profile.lock); + if (device->profile.data) { + data = device->profile.data; + data->dasd_sum_times += tottime; + data->dasd_sum_time_str += strtime; + data->dasd_sum_time_irq += irqtime; + data->dasd_sum_time_end += endtime; + dasd_profile_end_add_data(device->profile.data, + cqr->startdev != block->base, + cqr->cpmode == 1, + rq_data_dir(req) == READ, + sectors, sectors_ind, tottime_ind, + tottimeps_ind, strtime_ind, + irqtime_ind, irqtimeps_ind, + endtime_ind); + } + spin_unlock(&device->profile.lock); +} + +void dasd_profile_reset(struct dasd_profile *profile) +{ + struct dasd_profile_info *data; + + spin_lock_bh(&profile->lock); + data = profile->data; + if (!data) { + spin_unlock_bh(&profile->lock); + return; + } + memset(data, 0, sizeof(*data)); + ktime_get_real_ts64(&data->starttod); + spin_unlock_bh(&profile->lock); +} + +int dasd_profile_on(struct dasd_profile *profile) +{ + struct dasd_profile_info *data; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + spin_lock_bh(&profile->lock); + if (profile->data) { + spin_unlock_bh(&profile->lock); + kfree(data); + return 0; + } + ktime_get_real_ts64(&data->starttod); + profile->data = data; + spin_unlock_bh(&profile->lock); + return 0; +} + +void dasd_profile_off(struct dasd_profile *profile) +{ + spin_lock_bh(&profile->lock); + kfree(profile->data); + profile->data = NULL; + spin_unlock_bh(&profile->lock); +} + +char *dasd_get_user_string(const char __user *user_buf, size_t user_len) +{ + char *buffer; + + buffer = vmalloc(user_len + 1); + if (buffer == NULL) + return ERR_PTR(-ENOMEM); + if (copy_from_user(buffer, user_buf, user_len) != 0) { + vfree(buffer); + return ERR_PTR(-EFAULT); + } + /* got the string, now strip linefeed. */ + if (buffer[user_len - 1] == '\n') + buffer[user_len - 1] = 0; + else + buffer[user_len] = 0; + return buffer; +} + +static ssize_t dasd_stats_write(struct file *file, + const char __user *user_buf, + size_t user_len, loff_t *pos) +{ + char *buffer, *str; + int rc; + struct seq_file *m = (struct seq_file *)file->private_data; + struct dasd_profile *prof = m->private; + + if (user_len > 65536) + user_len = 65536; + buffer = dasd_get_user_string(user_buf, user_len); + if (IS_ERR(buffer)) + return PTR_ERR(buffer); + + str = skip_spaces(buffer); + rc = user_len; + if (strncmp(str, "reset", 5) == 0) { + dasd_profile_reset(prof); + } else if (strncmp(str, "on", 2) == 0) { + rc = dasd_profile_on(prof); + if (rc) + goto out; + rc = user_len; + if (prof == &dasd_global_profile) { + dasd_profile_reset(prof); + dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; + } + } else if (strncmp(str, "off", 3) == 0) { + if (prof == &dasd_global_profile) + dasd_global_profile_level = DASD_PROFILE_OFF; + dasd_profile_off(prof); + } else + rc = -EINVAL; +out: + vfree(buffer); + return rc; +} + +static void dasd_stats_array(struct seq_file *m, unsigned int *array) +{ + int i; + + for (i = 0; i < 32; i++) + seq_printf(m, "%u ", array[i]); + seq_putc(m, '\n'); +} + +static void dasd_stats_seq_print(struct seq_file *m, + struct dasd_profile_info *data) +{ + seq_printf(m, "start_time %lld.%09ld\n", + (s64)data->starttod.tv_sec, data->starttod.tv_nsec); + seq_printf(m, "total_requests %u\n", data->dasd_io_reqs); + seq_printf(m, "total_sectors %u\n", data->dasd_io_sects); + seq_printf(m, "total_pav %u\n", data->dasd_io_alias); + seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm); + seq_printf(m, "avg_total %lu\n", data->dasd_io_reqs ? + data->dasd_sum_times / data->dasd_io_reqs : 0UL); + seq_printf(m, "avg_build_to_ssch %lu\n", data->dasd_io_reqs ? + data->dasd_sum_time_str / data->dasd_io_reqs : 0UL); + seq_printf(m, "avg_ssch_to_irq %lu\n", data->dasd_io_reqs ? + data->dasd_sum_time_irq / data->dasd_io_reqs : 0UL); + seq_printf(m, "avg_irq_to_end %lu\n", data->dasd_io_reqs ? + data->dasd_sum_time_end / data->dasd_io_reqs : 0UL); + seq_puts(m, "histogram_sectors "); + dasd_stats_array(m, data->dasd_io_secs); + seq_puts(m, "histogram_io_times "); + dasd_stats_array(m, data->dasd_io_times); + seq_puts(m, "histogram_io_times_weighted "); + dasd_stats_array(m, data->dasd_io_timps); + seq_puts(m, "histogram_time_build_to_ssch "); + dasd_stats_array(m, data->dasd_io_time1); + seq_puts(m, "histogram_time_ssch_to_irq "); + dasd_stats_array(m, data->dasd_io_time2); + seq_puts(m, "histogram_time_ssch_to_irq_weighted "); + dasd_stats_array(m, data->dasd_io_time2ps); + seq_puts(m, "histogram_time_irq_to_end "); + dasd_stats_array(m, data->dasd_io_time3); + seq_puts(m, "histogram_ccw_queue_length "); + dasd_stats_array(m, data->dasd_io_nr_req); + seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs); + seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects); + seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias); + seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm); + seq_puts(m, "histogram_read_sectors "); + dasd_stats_array(m, data->dasd_read_secs); + seq_puts(m, "histogram_read_times "); + dasd_stats_array(m, data->dasd_read_times); + seq_puts(m, "histogram_read_time_build_to_ssch "); + dasd_stats_array(m, data->dasd_read_time1); + seq_puts(m, "histogram_read_time_ssch_to_irq "); + dasd_stats_array(m, data->dasd_read_time2); + seq_puts(m, "histogram_read_time_irq_to_end "); + dasd_stats_array(m, data->dasd_read_time3); + seq_puts(m, "histogram_read_ccw_queue_length "); + dasd_stats_array(m, data->dasd_read_nr_req); +} + +static int dasd_stats_show(struct seq_file *m, void *v) +{ + struct dasd_profile *profile; + struct dasd_profile_info *data; + + profile = m->private; + spin_lock_bh(&profile->lock); + data = profile->data; + if (!data) { + spin_unlock_bh(&profile->lock); + seq_puts(m, "disabled\n"); + return 0; + } + dasd_stats_seq_print(m, data); + spin_unlock_bh(&profile->lock); + return 0; +} + +static int dasd_stats_open(struct inode *inode, struct file *file) +{ + struct dasd_profile *profile = inode->i_private; + return single_open(file, dasd_stats_show, profile); +} + +static const struct file_operations dasd_stats_raw_fops = { + .owner = THIS_MODULE, + .open = dasd_stats_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .write = dasd_stats_write, +}; + +static void dasd_profile_init(struct dasd_profile *profile, + struct dentry *base_dentry) +{ + umode_t mode; + struct dentry *pde; + + if (!base_dentry) + return; + profile->dentry = NULL; + profile->data = NULL; + mode = (S_IRUSR | S_IWUSR | S_IFREG); + pde = debugfs_create_file("statistics", mode, base_dentry, + profile, &dasd_stats_raw_fops); + if (pde && !IS_ERR(pde)) + profile->dentry = pde; + return; +} + +static void dasd_profile_exit(struct dasd_profile *profile) +{ + dasd_profile_off(profile); + debugfs_remove(profile->dentry); + profile->dentry = NULL; +} + +static void dasd_statistics_removeroot(void) +{ + dasd_global_profile_level = DASD_PROFILE_OFF; + dasd_profile_exit(&dasd_global_profile); + debugfs_remove(dasd_debugfs_global_entry); + debugfs_remove(dasd_debugfs_root_entry); +} + +static void dasd_statistics_createroot(void) +{ + struct dentry *pde; + + dasd_debugfs_root_entry = NULL; + pde = debugfs_create_dir("dasd", NULL); + if (!pde || IS_ERR(pde)) + goto error; + dasd_debugfs_root_entry = pde; + pde = debugfs_create_dir("global", dasd_debugfs_root_entry); + if (!pde || IS_ERR(pde)) + goto error; + dasd_debugfs_global_entry = pde; + dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry); + return; + +error: + DBF_EVENT(DBF_ERR, "%s", + "Creation of the dasd debugfs interface failed"); + dasd_statistics_removeroot(); + return; +} + +#else +#define dasd_profile_start(block, cqr, req) do {} while (0) +#define dasd_profile_end(block, cqr, req) do {} while (0) + +static void dasd_statistics_createroot(void) +{ + return; +} + +static void dasd_statistics_removeroot(void) +{ + return; +} + +int dasd_stats_generic_show(struct seq_file *m, void *v) +{ + seq_puts(m, "Statistics are not activated in this kernel\n"); + return 0; +} + +static void dasd_profile_init(struct dasd_profile *profile, + struct dentry *base_dentry) +{ + return; +} + +static void dasd_profile_exit(struct dasd_profile *profile) +{ + return; +} + +int dasd_profile_on(struct dasd_profile *profile) +{ + return 0; +} + +#endif /* CONFIG_DASD_PROFILE */ + +static int dasd_hosts_show(struct seq_file *m, void *v) +{ + struct dasd_device *device; + int rc = -EOPNOTSUPP; + + device = m->private; + dasd_get_device(device); + + if (device->discipline->hosts_print) + rc = device->discipline->hosts_print(device, m); + + dasd_put_device(device); + return rc; +} + +static int dasd_hosts_open(struct inode *inode, struct file *file) +{ + struct dasd_device *device = inode->i_private; + + return single_open(file, dasd_hosts_show, device); +} + +static const struct file_operations dasd_hosts_fops = { + .owner = THIS_MODULE, + .open = dasd_hosts_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void dasd_hosts_exit(struct dasd_device *device) +{ + debugfs_remove(device->hosts_dentry); + device->hosts_dentry = NULL; +} + +static void dasd_hosts_init(struct dentry *base_dentry, + struct dasd_device *device) +{ + struct dentry *pde; + umode_t mode; + + if (!base_dentry) + return; + + mode = S_IRUSR | S_IFREG; + pde = debugfs_create_file("host_access_list", mode, base_dentry, + device, &dasd_hosts_fops); + if (pde && !IS_ERR(pde)) + device->hosts_dentry = pde; +} + +struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, int datasize, + struct dasd_device *device, + struct dasd_ccw_req *cqr) +{ + unsigned long flags; + char *data, *chunk; + int size = 0; + + if (cplength > 0) + size += cplength * sizeof(struct ccw1); + if (datasize > 0) + size += datasize; + if (!cqr) + size += (sizeof(*cqr) + 7L) & -8L; + + spin_lock_irqsave(&device->mem_lock, flags); + data = chunk = dasd_alloc_chunk(&device->ccw_chunks, size); + spin_unlock_irqrestore(&device->mem_lock, flags); + if (!chunk) + return ERR_PTR(-ENOMEM); + if (!cqr) { + cqr = (void *) data; + data += (sizeof(*cqr) + 7L) & -8L; + } + memset(cqr, 0, sizeof(*cqr)); + cqr->mem_chunk = chunk; + if (cplength > 0) { + cqr->cpaddr = data; + data += cplength * sizeof(struct ccw1); + memset(cqr->cpaddr, 0, cplength * sizeof(struct ccw1)); + } + if (datasize > 0) { + cqr->data = data; + memset(cqr->data, 0, datasize); + } + cqr->magic = magic; + set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + dasd_get_device(device); + return cqr; +} +EXPORT_SYMBOL(dasd_smalloc_request); + +void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) +{ + unsigned long flags; + + spin_lock_irqsave(&device->mem_lock, flags); + dasd_free_chunk(&device->ccw_chunks, cqr->mem_chunk); + spin_unlock_irqrestore(&device->mem_lock, flags); + dasd_put_device(device); +} +EXPORT_SYMBOL(dasd_sfree_request); + +/* + * Check discipline magic in cqr. + */ +static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device; + + if (cqr == NULL) + return -EINVAL; + device = cqr->startdev; + if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { + DBF_DEV_EVENT(DBF_WARNING, device, + " dasd_ccw_req 0x%08x magic doesn't match" + " discipline 0x%08x", + cqr->magic, + *(unsigned int *) device->discipline->name); + return -EINVAL; + } + return 0; +} + +/* + * Terminate the current i/o and set the request to clear_pending. + * Timer keeps device runnig. + * ccw_device_clear can fail if the i/o subsystem + * is in a bad mood. + */ +int dasd_term_IO(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device; + int retries, rc; + char errorstring[ERRORLENGTH]; + + /* Check the cqr */ + rc = dasd_check_cqr(cqr); + if (rc) + return rc; + retries = 0; + device = (struct dasd_device *) cqr->startdev; + while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { + rc = ccw_device_clear(device->cdev, (long) cqr); + switch (rc) { + case 0: /* termination successful */ + cqr->status = DASD_CQR_CLEAR_PENDING; + cqr->stopclk = get_tod_clock(); + cqr->starttime = 0; + DBF_DEV_EVENT(DBF_DEBUG, device, + "terminate cqr %p successful", + cqr); + break; + case -ENODEV: + DBF_DEV_EVENT(DBF_ERR, device, "%s", + "device gone, retry"); + break; + case -EINVAL: + /* + * device not valid so no I/O could be running + * handle CQR as termination successful + */ + cqr->status = DASD_CQR_CLEARED; + cqr->stopclk = get_tod_clock(); + cqr->starttime = 0; + /* no retries for invalid devices */ + cqr->retries = -1; + DBF_DEV_EVENT(DBF_ERR, device, "%s", + "EINVAL, handle as terminated"); + /* fake rc to success */ + rc = 0; + break; + default: + /* internal error 10 - unknown rc*/ + snprintf(errorstring, ERRORLENGTH, "10 %d", rc); + dev_err(&device->cdev->dev, "An error occurred in the " + "DASD device driver, reason=%s\n", errorstring); + BUG(); + break; + } + retries++; + } + dasd_schedule_device_bh(device); + return rc; +} +EXPORT_SYMBOL(dasd_term_IO); + +/* + * Start the i/o. This start_IO can fail if the channel is really busy. + * In that case set up a timer to start the request later. + */ +int dasd_start_IO(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device; + int rc; + char errorstring[ERRORLENGTH]; + + /* Check the cqr */ + rc = dasd_check_cqr(cqr); + if (rc) { + cqr->intrc = rc; + return rc; + } + device = (struct dasd_device *) cqr->startdev; + if (((cqr->block && + test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || + test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && + !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { + DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " + "because of stolen lock", cqr); + cqr->status = DASD_CQR_ERROR; + cqr->intrc = -EPERM; + return -EPERM; + } + if (cqr->retries < 0) { + /* internal error 14 - start_IO run out of retries */ + sprintf(errorstring, "14 %p", cqr); + dev_err(&device->cdev->dev, "An error occurred in the DASD " + "device driver, reason=%s\n", errorstring); + cqr->status = DASD_CQR_ERROR; + return -EIO; + } + cqr->startclk = get_tod_clock(); + cqr->starttime = jiffies; + cqr->retries--; + if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { + cqr->lpm &= dasd_path_get_opm(device); + if (!cqr->lpm) + cqr->lpm = dasd_path_get_opm(device); + } + if (cqr->cpmode == 1) { + rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, + (long) cqr, cqr->lpm); + } else { + rc = ccw_device_start(device->cdev, cqr->cpaddr, + (long) cqr, cqr->lpm, 0); + } + switch (rc) { + case 0: + cqr->status = DASD_CQR_IN_IO; + break; + case -EBUSY: + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "start_IO: device busy, retry later"); + break; + case -EACCES: + /* -EACCES indicates that the request used only a subset of the + * available paths and all these paths are gone. If the lpm of + * this request was only a subset of the opm (e.g. the ppm) then + * we just do a retry with all available paths. + * If we already use the full opm, something is amiss, and we + * need a full path verification. + */ + if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { + DBF_DEV_EVENT(DBF_WARNING, device, + "start_IO: selected paths gone (%x)", + cqr->lpm); + } else if (cqr->lpm != dasd_path_get_opm(device)) { + cqr->lpm = dasd_path_get_opm(device); + DBF_DEV_EVENT(DBF_DEBUG, device, "%s", + "start_IO: selected paths gone," + " retry on all paths"); + } else { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "start_IO: all paths in opm gone," + " do path verification"); + dasd_generic_last_path_gone(device); + dasd_path_no_path(device); + dasd_path_set_tbvpm(device, + ccw_device_get_path_mask( + device->cdev)); + } + break; + case -ENODEV: + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "start_IO: -ENODEV device gone, retry"); + break; + case -EIO: + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "start_IO: -EIO device gone, retry"); + break; + case -EINVAL: + /* most likely caused in power management context */ + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "start_IO: -EINVAL device currently " + "not accessible"); + break; + default: + /* internal error 11 - unknown rc */ + snprintf(errorstring, ERRORLENGTH, "11 %d", rc); + dev_err(&device->cdev->dev, + "An error occurred in the DASD device driver, " + "reason=%s\n", errorstring); + BUG(); + break; + } + cqr->intrc = rc; + return rc; +} +EXPORT_SYMBOL(dasd_start_IO); + +/* + * Timeout function for dasd devices. This is used for different purposes + * 1) missing interrupt handler for normal operation + * 2) delayed start of request where start_IO failed with -EBUSY + * 3) timeout for missing state change interrupts + * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), + * DASD_CQR_QUEUED for 2) and 3). + */ +static void dasd_device_timeout(struct timer_list *t) +{ + unsigned long flags; + struct dasd_device *device; + + device = from_timer(device, t, timer); + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + /* re-activate request queue */ + dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + dasd_schedule_device_bh(device); +} + +/* + * Setup timeout for a device in jiffies. + */ +void dasd_device_set_timer(struct dasd_device *device, int expires) +{ + if (expires == 0) + del_timer(&device->timer); + else + mod_timer(&device->timer, jiffies + expires); +} +EXPORT_SYMBOL(dasd_device_set_timer); + +/* + * Clear timeout for a device. + */ +void dasd_device_clear_timer(struct dasd_device *device) +{ + del_timer(&device->timer); +} +EXPORT_SYMBOL(dasd_device_clear_timer); + +static void dasd_handle_killed_request(struct ccw_device *cdev, + unsigned long intparm) +{ + struct dasd_ccw_req *cqr; + struct dasd_device *device; + + if (!intparm) + return; + cqr = (struct dasd_ccw_req *) intparm; + if (cqr->status != DASD_CQR_IN_IO) { + DBF_EVENT_DEVID(DBF_DEBUG, cdev, + "invalid status in handle_killed_request: " + "%02x", cqr->status); + return; + } + + device = dasd_device_from_cdev_locked(cdev); + if (IS_ERR(device)) { + DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", + "unable to get device from cdev"); + return; + } + + if (!cqr->startdev || + device != cqr->startdev || + strncmp(cqr->startdev->discipline->ebcname, + (char *) &cqr->magic, 4)) { + DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", + "invalid device in request"); + dasd_put_device(device); + return; + } + + /* Schedule request to be retried. */ + cqr->status = DASD_CQR_QUEUED; + + dasd_device_clear_timer(device); + dasd_schedule_device_bh(device); + dasd_put_device(device); +} + +void dasd_generic_handle_state_change(struct dasd_device *device) +{ + /* First of all start sense subsystem status request. */ + dasd_eer_snss(device); + + dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); + dasd_schedule_device_bh(device); + if (device->block) { + dasd_schedule_block_bh(device->block); + if (device->block->request_queue) + blk_mq_run_hw_queues(device->block->request_queue, + true); + } +} +EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); + +static int dasd_check_hpf_error(struct irb *irb) +{ + return (scsw_tm_is_valid_schxs(&irb->scsw) && + (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX || + irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX)); +} + +/* + * Interrupt handler for "normal" ssch-io based dasd devices. + */ +void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, + struct irb *irb) +{ + struct dasd_ccw_req *cqr, *next; + struct dasd_device *device; + unsigned long now; + int nrf_suppressed = 0; + int fp_suppressed = 0; + u8 *sense = NULL; + int expires; + + cqr = (struct dasd_ccw_req *) intparm; + if (IS_ERR(irb)) { + switch (PTR_ERR(irb)) { + case -EIO: + if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) { + device = cqr->startdev; + cqr->status = DASD_CQR_CLEARED; + dasd_device_clear_timer(device); + wake_up(&dasd_flush_wq); + dasd_schedule_device_bh(device); + return; + } + break; + case -ETIMEDOUT: + DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " + "request timed out\n", __func__); + break; + default: + DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " + "unknown error %ld\n", __func__, + PTR_ERR(irb)); + } + dasd_handle_killed_request(cdev, intparm); + return; + } + + now = get_tod_clock(); + /* check for conditions that should be handled immediately */ + if (!cqr || + !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && + scsw_cstat(&irb->scsw) == 0)) { + if (cqr) + memcpy(&cqr->irb, irb, sizeof(*irb)); + device = dasd_device_from_cdev_locked(cdev); + if (IS_ERR(device)) + return; + /* ignore unsolicited interrupts for DIAG discipline */ + if (device->discipline == dasd_diag_discipline_pointer) { + dasd_put_device(device); + return; + } + + /* + * In some cases 'File Protected' or 'No Record Found' errors + * might be expected and debug log messages for the + * corresponding interrupts shouldn't be written then. + * Check if either of the according suppress bits is set. + */ + sense = dasd_get_sense(irb); + if (sense) { + fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) && + test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags); + nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) && + test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags); + } + if (!(fp_suppressed || nrf_suppressed)) + device->discipline->dump_sense_dbf(device, irb, "int"); + + if (device->features & DASD_FEATURE_ERPLOG) + device->discipline->dump_sense(device, cqr, irb); + device->discipline->check_for_device_change(device, cqr, irb); + dasd_put_device(device); + } + + /* check for for attention message */ + if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) { + device = dasd_device_from_cdev_locked(cdev); + if (!IS_ERR(device)) { + device->discipline->check_attention(device, + irb->esw.esw1.lpum); + dasd_put_device(device); + } + } + + if (!cqr) + return; + + device = (struct dasd_device *) cqr->startdev; + if (!device || + strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { + DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", + "invalid device in request"); + return; + } + + /* Check for clear pending */ + if (cqr->status == DASD_CQR_CLEAR_PENDING && + scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { + cqr->status = DASD_CQR_CLEARED; + dasd_device_clear_timer(device); + wake_up(&dasd_flush_wq); + dasd_schedule_device_bh(device); + return; + } + + /* check status - the request might have been killed by dyn detach */ + if (cqr->status != DASD_CQR_IN_IO) { + DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " + "status %02x", dev_name(&cdev->dev), cqr->status); + return; + } + + next = NULL; + expires = 0; + if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && + scsw_cstat(&irb->scsw) == 0) { + /* request was completed successfully */ + cqr->status = DASD_CQR_SUCCESS; + cqr->stopclk = now; + /* Start first request on queue if possible -> fast_io. */ + if (cqr->devlist.next != &device->ccw_queue) { + next = list_entry(cqr->devlist.next, + struct dasd_ccw_req, devlist); + } + } else { /* error */ + /* check for HPF error + * call discipline function to requeue all requests + * and disable HPF accordingly + */ + if (cqr->cpmode && dasd_check_hpf_error(irb) && + device->discipline->handle_hpf_error) + device->discipline->handle_hpf_error(device, irb); + /* + * If we don't want complex ERP for this request, then just + * reset this and retry it in the fastpath + */ + if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && + cqr->retries > 0) { + if (cqr->lpm == dasd_path_get_opm(device)) + DBF_DEV_EVENT(DBF_DEBUG, device, + "default ERP in fastpath " + "(%i retries left)", + cqr->retries); + if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) + cqr->lpm = dasd_path_get_opm(device); + cqr->status = DASD_CQR_QUEUED; + next = cqr; + } else + cqr->status = DASD_CQR_ERROR; + } + if (next && (next->status == DASD_CQR_QUEUED) && + (!device->stopped)) { + if (device->discipline->start_IO(next) == 0) + expires = next->expires; + } + if (expires != 0) + dasd_device_set_timer(device, expires); + else + dasd_device_clear_timer(device); + dasd_schedule_device_bh(device); +} +EXPORT_SYMBOL(dasd_int_handler); + +enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) +{ + struct dasd_device *device; + + device = dasd_device_from_cdev_locked(cdev); + + if (IS_ERR(device)) + goto out; + if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || + device->state != device->target || + !device->discipline->check_for_device_change){ + dasd_put_device(device); + goto out; + } + if (device->discipline->dump_sense_dbf) + device->discipline->dump_sense_dbf(device, irb, "uc"); + device->discipline->check_for_device_change(device, NULL, irb); + dasd_put_device(device); +out: + return UC_TODO_RETRY; +} +EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); + +/* + * If we have an error on a dasd_block layer request then we cancel + * and return all further requests from the same dasd_block as well. + */ +static void __dasd_device_recovery(struct dasd_device *device, + struct dasd_ccw_req *ref_cqr) +{ + struct list_head *l, *n; + struct dasd_ccw_req *cqr; + + /* + * only requeue request that came from the dasd_block layer + */ + if (!ref_cqr->block) + return; + + list_for_each_safe(l, n, &device->ccw_queue) { + cqr = list_entry(l, struct dasd_ccw_req, devlist); + if (cqr->status == DASD_CQR_QUEUED && + ref_cqr->block == cqr->block) { + cqr->status = DASD_CQR_CLEARED; + } + } +}; + +/* + * Remove those ccw requests from the queue that need to be returned + * to the upper layer. + */ +static void __dasd_device_process_ccw_queue(struct dasd_device *device, + struct list_head *final_queue) +{ + struct list_head *l, *n; + struct dasd_ccw_req *cqr; + + /* Process request with final status. */ + list_for_each_safe(l, n, &device->ccw_queue) { + cqr = list_entry(l, struct dasd_ccw_req, devlist); + + /* Skip any non-final request. */ + if (cqr->status == DASD_CQR_QUEUED || + cqr->status == DASD_CQR_IN_IO || + cqr->status == DASD_CQR_CLEAR_PENDING) + continue; + if (cqr->status == DASD_CQR_ERROR) { + __dasd_device_recovery(device, cqr); + } + /* Rechain finished requests to final queue */ + list_move_tail(&cqr->devlist, final_queue); + } +} + +static void __dasd_process_cqr(struct dasd_device *device, + struct dasd_ccw_req *cqr) +{ + char errorstring[ERRORLENGTH]; + + switch (cqr->status) { + case DASD_CQR_SUCCESS: + cqr->status = DASD_CQR_DONE; + break; + case DASD_CQR_ERROR: + cqr->status = DASD_CQR_NEED_ERP; + break; + case DASD_CQR_CLEARED: + cqr->status = DASD_CQR_TERMINATED; + break; + default: + /* internal error 12 - wrong cqr status*/ + snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); + dev_err(&device->cdev->dev, + "An error occurred in the DASD device driver, " + "reason=%s\n", errorstring); + BUG(); + } + if (cqr->callback) + cqr->callback(cqr, cqr->callback_data); +} + +/* + * the cqrs from the final queue are returned to the upper layer + * by setting a dasd_block state and calling the callback function + */ +static void __dasd_device_process_final_queue(struct dasd_device *device, + struct list_head *final_queue) +{ + struct list_head *l, *n; + struct dasd_ccw_req *cqr; + struct dasd_block *block; + + list_for_each_safe(l, n, final_queue) { + cqr = list_entry(l, struct dasd_ccw_req, devlist); + list_del_init(&cqr->devlist); + block = cqr->block; + if (!block) { + __dasd_process_cqr(device, cqr); + } else { + spin_lock_bh(&block->queue_lock); + __dasd_process_cqr(device, cqr); + spin_unlock_bh(&block->queue_lock); + } + } +} + +/* + * Take a look at the first request on the ccw queue and check + * if it reached its expire time. If so, terminate the IO. + */ +static void __dasd_device_check_expire(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr; + + if (list_empty(&device->ccw_queue)) + return; + cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); + if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && + (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { + if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { + /* + * IO in safe offline processing should not + * run out of retries + */ + cqr->retries++; + } + if (device->discipline->term_IO(cqr) != 0) { + /* Hmpf, try again in 5 sec */ + dev_err(&device->cdev->dev, + "cqr %p timed out (%lus) but cannot be " + "ended, retrying in 5 s\n", + cqr, (cqr->expires/HZ)); + cqr->expires += 5*HZ; + dasd_device_set_timer(device, 5*HZ); + } else { + dev_err(&device->cdev->dev, + "cqr %p timed out (%lus), %i retries " + "remaining\n", cqr, (cqr->expires/HZ), + cqr->retries); + } + } +} + +/* + * return 1 when device is not eligible for IO + */ +static int __dasd_device_is_unusable(struct dasd_device *device, + struct dasd_ccw_req *cqr) +{ + int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM); + + if (test_bit(DASD_FLAG_OFFLINE, &device->flags) && + !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { + /* + * dasd is being set offline + * but it is no safe offline where we have to allow I/O + */ + return 1; + } + if (device->stopped) { + if (device->stopped & mask) { + /* stopped and CQR will not change that. */ + return 1; + } + if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { + /* CQR is not able to change device to + * operational. */ + return 1; + } + /* CQR required to get device operational. */ + } + return 0; +} + +/* + * Take a look at the first request on the ccw queue and check + * if it needs to be started. + */ +static void __dasd_device_start_head(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr; + int rc; + + if (list_empty(&device->ccw_queue)) + return; + cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); + if (cqr->status != DASD_CQR_QUEUED) + return; + /* if device is not usable return request to upper layer */ + if (__dasd_device_is_unusable(device, cqr)) { + cqr->intrc = -EAGAIN; + cqr->status = DASD_CQR_CLEARED; + dasd_schedule_device_bh(device); + return; + } + + rc = device->discipline->start_IO(cqr); + if (rc == 0) + dasd_device_set_timer(device, cqr->expires); + else if (rc == -EACCES) { + dasd_schedule_device_bh(device); + } else + /* Hmpf, try again in 1/2 sec */ + dasd_device_set_timer(device, 50); +} + +static void __dasd_device_check_path_events(struct dasd_device *device) +{ + int rc; + + if (!dasd_path_get_tbvpm(device)) + return; + + if (device->stopped & + ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM)) + return; + rc = device->discipline->verify_path(device, + dasd_path_get_tbvpm(device)); + if (rc) + dasd_device_set_timer(device, 50); + else + dasd_path_clear_all_verify(device); +}; + +/* + * Go through all request on the dasd_device request queue, + * terminate them on the cdev if necessary, and return them to the + * submitting layer via callback. + * Note: + * Make sure that all 'submitting layers' still exist when + * this function is called!. In other words, when 'device' is a base + * device then all block layer requests must have been removed before + * via dasd_flush_block_queue. + */ +int dasd_flush_device_queue(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr, *n; + int rc; + struct list_head flush_queue; + + INIT_LIST_HEAD(&flush_queue); + spin_lock_irq(get_ccwdev_lock(device->cdev)); + rc = 0; + list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { + /* Check status and move request to flush_queue */ + switch (cqr->status) { + case DASD_CQR_IN_IO: + rc = device->discipline->term_IO(cqr); + if (rc) { + /* unable to terminate requeust */ + dev_err(&device->cdev->dev, + "Flushing the DASD request queue " + "failed for request %p\n", cqr); + /* stop flush processing */ + goto finished; + } + break; + case DASD_CQR_QUEUED: + cqr->stopclk = get_tod_clock(); + cqr->status = DASD_CQR_CLEARED; + break; + default: /* no need to modify the others */ + break; + } + list_move_tail(&cqr->devlist, &flush_queue); + } +finished: + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + /* + * After this point all requests must be in state CLEAR_PENDING, + * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become + * one of the others. + */ + list_for_each_entry_safe(cqr, n, &flush_queue, devlist) + wait_event(dasd_flush_wq, + (cqr->status != DASD_CQR_CLEAR_PENDING)); + /* + * Now set each request back to TERMINATED, DONE or NEED_ERP + * and call the callback function of flushed requests + */ + __dasd_device_process_final_queue(device, &flush_queue); + return rc; +} +EXPORT_SYMBOL_GPL(dasd_flush_device_queue); + +/* + * Acquire the device lock and process queues for the device. + */ +static void dasd_device_tasklet(unsigned long data) +{ + struct dasd_device *device = (struct dasd_device *) data; + struct list_head final_queue; + + atomic_set (&device->tasklet_scheduled, 0); + INIT_LIST_HEAD(&final_queue); + spin_lock_irq(get_ccwdev_lock(device->cdev)); + /* Check expire time of first request on the ccw queue. */ + __dasd_device_check_expire(device); + /* find final requests on ccw queue */ + __dasd_device_process_ccw_queue(device, &final_queue); + __dasd_device_check_path_events(device); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + /* Now call the callback function of requests with final status */ + __dasd_device_process_final_queue(device, &final_queue); + spin_lock_irq(get_ccwdev_lock(device->cdev)); + /* Now check if the head of the ccw queue needs to be started. */ + __dasd_device_start_head(device); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + if (waitqueue_active(&shutdown_waitq)) + wake_up(&shutdown_waitq); + dasd_put_device(device); +} + +/* + * Schedules a call to dasd_tasklet over the device tasklet. + */ +void dasd_schedule_device_bh(struct dasd_device *device) +{ + /* Protect against rescheduling. */ + if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) + return; + dasd_get_device(device); + tasklet_hi_schedule(&device->tasklet); +} +EXPORT_SYMBOL(dasd_schedule_device_bh); + +void dasd_device_set_stop_bits(struct dasd_device *device, int bits) +{ + device->stopped |= bits; +} +EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); + +void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) +{ + device->stopped &= ~bits; + if (!device->stopped) + wake_up(&generic_waitq); +} +EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); + +/* + * Queue a request to the head of the device ccw_queue. + * Start the I/O if possible. + */ +void dasd_add_request_head(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device; + unsigned long flags; + + device = cqr->startdev; + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + cqr->status = DASD_CQR_QUEUED; + list_add(&cqr->devlist, &device->ccw_queue); + /* let the bh start the request to keep them in order */ + dasd_schedule_device_bh(device); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); +} +EXPORT_SYMBOL(dasd_add_request_head); + +/* + * Queue a request to the tail of the device ccw_queue. + * Start the I/O if possible. + */ +void dasd_add_request_tail(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device; + unsigned long flags; + + device = cqr->startdev; + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + cqr->status = DASD_CQR_QUEUED; + list_add_tail(&cqr->devlist, &device->ccw_queue); + /* let the bh start the request to keep them in order */ + dasd_schedule_device_bh(device); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); +} +EXPORT_SYMBOL(dasd_add_request_tail); + +/* + * Wakeup helper for the 'sleep_on' functions. + */ +void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) +{ + spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); + cqr->callback_data = DASD_SLEEPON_END_TAG; + spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); + wake_up(&generic_waitq); +} +EXPORT_SYMBOL_GPL(dasd_wakeup_cb); + +static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device; + int rc; + + device = cqr->startdev; + spin_lock_irq(get_ccwdev_lock(device->cdev)); + rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + return rc; +} + +/* + * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. + */ +static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device; + dasd_erp_fn_t erp_fn; + + if (cqr->status == DASD_CQR_FILLED) + return 0; + device = cqr->startdev; + if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { + if (cqr->status == DASD_CQR_TERMINATED) { + device->discipline->handle_terminated_request(cqr); + return 1; + } + if (cqr->status == DASD_CQR_NEED_ERP) { + erp_fn = device->discipline->erp_action(cqr); + erp_fn(cqr); + return 1; + } + if (cqr->status == DASD_CQR_FAILED) + dasd_log_sense(cqr, &cqr->irb); + if (cqr->refers) { + __dasd_process_erp(device, cqr); + return 1; + } + } + return 0; +} + +static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) +{ + if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { + if (cqr->refers) /* erp is not done yet */ + return 1; + return ((cqr->status != DASD_CQR_DONE) && + (cqr->status != DASD_CQR_FAILED)); + } else + return (cqr->status == DASD_CQR_FILLED); +} + +static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) +{ + struct dasd_device *device; + int rc; + struct list_head ccw_queue; + struct dasd_ccw_req *cqr; + + INIT_LIST_HEAD(&ccw_queue); + maincqr->status = DASD_CQR_FILLED; + device = maincqr->startdev; + list_add(&maincqr->blocklist, &ccw_queue); + for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); + cqr = list_first_entry(&ccw_queue, + struct dasd_ccw_req, blocklist)) { + + if (__dasd_sleep_on_erp(cqr)) + continue; + if (cqr->status != DASD_CQR_FILLED) /* could be failed */ + continue; + if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && + !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { + cqr->status = DASD_CQR_FAILED; + cqr->intrc = -EPERM; + continue; + } + /* Non-temporary stop condition will trigger fail fast */ + if (device->stopped & ~DASD_STOPPED_PENDING && + test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && + (!dasd_eer_enabled(device))) { + cqr->status = DASD_CQR_FAILED; + cqr->intrc = -ENOLINK; + continue; + } + /* + * Don't try to start requests if device is in + * offline processing, it might wait forever + */ + if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { + cqr->status = DASD_CQR_FAILED; + cqr->intrc = -ENODEV; + continue; + } + /* + * Don't try to start requests if device is stopped + * except path verification requests + */ + if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { + if (interruptible) { + rc = wait_event_interruptible( + generic_waitq, !(device->stopped)); + if (rc == -ERESTARTSYS) { + cqr->status = DASD_CQR_FAILED; + maincqr->intrc = rc; + continue; + } + } else + wait_event(generic_waitq, !(device->stopped)); + } + if (!cqr->callback) + cqr->callback = dasd_wakeup_cb; + + cqr->callback_data = DASD_SLEEPON_START_TAG; + dasd_add_request_tail(cqr); + if (interruptible) { + rc = wait_event_interruptible( + generic_waitq, _wait_for_wakeup(cqr)); + if (rc == -ERESTARTSYS) { + dasd_cancel_req(cqr); + /* wait (non-interruptible) for final status */ + wait_event(generic_waitq, + _wait_for_wakeup(cqr)); + cqr->status = DASD_CQR_FAILED; + maincqr->intrc = rc; + continue; + } + } else + wait_event(generic_waitq, _wait_for_wakeup(cqr)); + } + + maincqr->endclk = get_tod_clock(); + if ((maincqr->status != DASD_CQR_DONE) && + (maincqr->intrc != -ERESTARTSYS)) + dasd_log_sense(maincqr, &maincqr->irb); + if (maincqr->status == DASD_CQR_DONE) + rc = 0; + else if (maincqr->intrc) + rc = maincqr->intrc; + else + rc = -EIO; + return rc; +} + +static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue) +{ + struct dasd_ccw_req *cqr; + + list_for_each_entry(cqr, ccw_queue, blocklist) { + if (cqr->callback_data != DASD_SLEEPON_END_TAG) + return 0; + } + + return 1; +} + +static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible) +{ + struct dasd_device *device; + struct dasd_ccw_req *cqr, *n; + u8 *sense = NULL; + int rc; + +retry: + list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { + device = cqr->startdev; + if (cqr->status != DASD_CQR_FILLED) /*could be failed*/ + continue; + + if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && + !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { + cqr->status = DASD_CQR_FAILED; + cqr->intrc = -EPERM; + continue; + } + /*Non-temporary stop condition will trigger fail fast*/ + if (device->stopped & ~DASD_STOPPED_PENDING && + test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && + !dasd_eer_enabled(device)) { + cqr->status = DASD_CQR_FAILED; + cqr->intrc = -EAGAIN; + continue; + } + + /*Don't try to start requests if device is stopped*/ + if (interruptible) { + rc = wait_event_interruptible( + generic_waitq, !device->stopped); + if (rc == -ERESTARTSYS) { + cqr->status = DASD_CQR_FAILED; + cqr->intrc = rc; + continue; + } + } else + wait_event(generic_waitq, !(device->stopped)); + + if (!cqr->callback) + cqr->callback = dasd_wakeup_cb; + cqr->callback_data = DASD_SLEEPON_START_TAG; + dasd_add_request_tail(cqr); + } + + wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue)); + + rc = 0; + list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { + /* + * In some cases the 'File Protected' or 'Incorrect Length' + * error might be expected and error recovery would be + * unnecessary in these cases. Check if the according suppress + * bit is set. + */ + sense = dasd_get_sense(&cqr->irb); + if (sense && sense[1] & SNS1_FILE_PROTECTED && + test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags)) + continue; + if (scsw_cstat(&cqr->irb.scsw) == 0x40 && + test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags)) + continue; + + /* + * for alias devices simplify error recovery and + * return to upper layer + * do not skip ERP requests + */ + if (cqr->startdev != cqr->basedev && !cqr->refers && + (cqr->status == DASD_CQR_TERMINATED || + cqr->status == DASD_CQR_NEED_ERP)) + return -EAGAIN; + + /* normal recovery for basedev IO */ + if (__dasd_sleep_on_erp(cqr)) + /* handle erp first */ + goto retry; + } + + return 0; +} + +/* + * Queue a request to the tail of the device ccw_queue and wait for + * it's completion. + */ +int dasd_sleep_on(struct dasd_ccw_req *cqr) +{ + return _dasd_sleep_on(cqr, 0); +} +EXPORT_SYMBOL(dasd_sleep_on); + +/* + * Start requests from a ccw_queue and wait for their completion. + */ +int dasd_sleep_on_queue(struct list_head *ccw_queue) +{ + return _dasd_sleep_on_queue(ccw_queue, 0); +} +EXPORT_SYMBOL(dasd_sleep_on_queue); + +/* + * Queue a request to the tail of the device ccw_queue and wait + * interruptible for it's completion. + */ +int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) +{ + return _dasd_sleep_on(cqr, 1); +} +EXPORT_SYMBOL(dasd_sleep_on_interruptible); + +/* + * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock + * for eckd devices) the currently running request has to be terminated + * and be put back to status queued, before the special request is added + * to the head of the queue. Then the special request is waited on normally. + */ +static inline int _dasd_term_running_cqr(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr; + int rc; + + if (list_empty(&device->ccw_queue)) + return 0; + cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); + rc = device->discipline->term_IO(cqr); + if (!rc) + /* + * CQR terminated because a more important request is pending. + * Undo decreasing of retry counter because this is + * not an error case. + */ + cqr->retries++; + return rc; +} + +int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device; + int rc; + + device = cqr->startdev; + if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && + !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { + cqr->status = DASD_CQR_FAILED; + cqr->intrc = -EPERM; + return -EIO; + } + spin_lock_irq(get_ccwdev_lock(device->cdev)); + rc = _dasd_term_running_cqr(device); + if (rc) { + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + return rc; + } + cqr->callback = dasd_wakeup_cb; + cqr->callback_data = DASD_SLEEPON_START_TAG; + cqr->status = DASD_CQR_QUEUED; + /* + * add new request as second + * first the terminated cqr needs to be finished + */ + list_add(&cqr->devlist, device->ccw_queue.next); + + /* let the bh start the request to keep them in order */ + dasd_schedule_device_bh(device); + + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + + wait_event(generic_waitq, _wait_for_wakeup(cqr)); + + if (cqr->status == DASD_CQR_DONE) + rc = 0; + else if (cqr->intrc) + rc = cqr->intrc; + else + rc = -EIO; + + /* kick tasklets */ + dasd_schedule_device_bh(device); + if (device->block) + dasd_schedule_block_bh(device->block); + + return rc; +} +EXPORT_SYMBOL(dasd_sleep_on_immediatly); + +/* + * Cancels a request that was started with dasd_sleep_on_req. + * This is useful to timeout requests. The request will be + * terminated if it is currently in i/o. + * Returns 0 if request termination was successful + * negative error code if termination failed + * Cancellation of a request is an asynchronous operation! The calling + * function has to wait until the request is properly returned via callback. + */ +static int __dasd_cancel_req(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device = cqr->startdev; + int rc = 0; + + switch (cqr->status) { + case DASD_CQR_QUEUED: + /* request was not started - just set to cleared */ + cqr->status = DASD_CQR_CLEARED; + break; + case DASD_CQR_IN_IO: + /* request in IO - terminate IO and release again */ + rc = device->discipline->term_IO(cqr); + if (rc) { + dev_err(&device->cdev->dev, + "Cancelling request %p failed with rc=%d\n", + cqr, rc); + } else { + cqr->stopclk = get_tod_clock(); + } + break; + default: /* already finished or clear pending - do nothing */ + break; + } + dasd_schedule_device_bh(device); + return rc; +} + +int dasd_cancel_req(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device = cqr->startdev; + unsigned long flags; + int rc; + + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + rc = __dasd_cancel_req(cqr); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + return rc; +} + +/* + * SECTION: Operations of the dasd_block layer. + */ + +/* + * Timeout function for dasd_block. This is used when the block layer + * is waiting for something that may not come reliably, (e.g. a state + * change interrupt) + */ +static void dasd_block_timeout(struct timer_list *t) +{ + unsigned long flags; + struct dasd_block *block; + + block = from_timer(block, t, timer); + spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); + /* re-activate request queue */ + dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); + spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); + dasd_schedule_block_bh(block); + blk_mq_run_hw_queues(block->request_queue, true); +} + +/* + * Setup timeout for a dasd_block in jiffies. + */ +void dasd_block_set_timer(struct dasd_block *block, int expires) +{ + if (expires == 0) + del_timer(&block->timer); + else + mod_timer(&block->timer, jiffies + expires); +} +EXPORT_SYMBOL(dasd_block_set_timer); + +/* + * Clear timeout for a dasd_block. + */ +void dasd_block_clear_timer(struct dasd_block *block) +{ + del_timer(&block->timer); +} +EXPORT_SYMBOL(dasd_block_clear_timer); + +/* + * Process finished error recovery ccw. + */ +static void __dasd_process_erp(struct dasd_device *device, + struct dasd_ccw_req *cqr) +{ + dasd_erp_fn_t erp_fn; + + if (cqr->status == DASD_CQR_DONE) + DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); + else + dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); + erp_fn = device->discipline->erp_postaction(cqr); + erp_fn(cqr); +} + +static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) +{ + struct request *req; + blk_status_t error = BLK_STS_OK; + int status; + + req = (struct request *) cqr->callback_data; + dasd_profile_end(cqr->block, cqr, req); + + status = cqr->block->base->discipline->free_cp(cqr, req); + if (status < 0) + error = errno_to_blk_status(status); + else if (status == 0) { + switch (cqr->intrc) { + case -EPERM: + error = BLK_STS_NEXUS; + break; + case -ENOLINK: + error = BLK_STS_TRANSPORT; + break; + case -ETIMEDOUT: + error = BLK_STS_TIMEOUT; + break; + default: + error = BLK_STS_IOERR; + break; + } + } + + /* + * We need to take care for ETIMEDOUT errors here since the + * complete callback does not get called in this case. + * Take care of all errors here and avoid additional code to + * transfer the error value to the complete callback. + */ + if (error) { + blk_mq_end_request(req, error); + blk_mq_run_hw_queues(req->q, true); + } else { + blk_mq_complete_request(req); + } +} + +/* + * Process ccw request queue. + */ +static void __dasd_process_block_ccw_queue(struct dasd_block *block, + struct list_head *final_queue) +{ + struct list_head *l, *n; + struct dasd_ccw_req *cqr; + dasd_erp_fn_t erp_fn; + unsigned long flags; + struct dasd_device *base = block->base; + +restart: + /* Process request with final status. */ + list_for_each_safe(l, n, &block->ccw_queue) { + cqr = list_entry(l, struct dasd_ccw_req, blocklist); + if (cqr->status != DASD_CQR_DONE && + cqr->status != DASD_CQR_FAILED && + cqr->status != DASD_CQR_NEED_ERP && + cqr->status != DASD_CQR_TERMINATED) + continue; + + if (cqr->status == DASD_CQR_TERMINATED) { + base->discipline->handle_terminated_request(cqr); + goto restart; + } + + /* Process requests that may be recovered */ + if (cqr->status == DASD_CQR_NEED_ERP) { + erp_fn = base->discipline->erp_action(cqr); + if (IS_ERR(erp_fn(cqr))) + continue; + goto restart; + } + + /* log sense for fatal error */ + if (cqr->status == DASD_CQR_FAILED) { + dasd_log_sense(cqr, &cqr->irb); + } + + /* First of all call extended error reporting. */ + if (dasd_eer_enabled(base) && + cqr->status == DASD_CQR_FAILED) { + dasd_eer_write(base, cqr, DASD_EER_FATALERROR); + + /* restart request */ + cqr->status = DASD_CQR_FILLED; + cqr->retries = 255; + spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); + dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); + spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), + flags); + goto restart; + } + + /* Process finished ERP request. */ + if (cqr->refers) { + __dasd_process_erp(base, cqr); + goto restart; + } + + /* Rechain finished requests to final queue */ + cqr->endclk = get_tod_clock(); + list_move_tail(&cqr->blocklist, final_queue); + } +} + +static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) +{ + dasd_schedule_block_bh(cqr->block); +} + +static void __dasd_block_start_head(struct dasd_block *block) +{ + struct dasd_ccw_req *cqr; + + if (list_empty(&block->ccw_queue)) + return; + /* We allways begin with the first requests on the queue, as some + * of previously started requests have to be enqueued on a + * dasd_device again for error recovery. + */ + list_for_each_entry(cqr, &block->ccw_queue, blocklist) { + if (cqr->status != DASD_CQR_FILLED) + continue; + if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && + !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { + cqr->status = DASD_CQR_FAILED; + cqr->intrc = -EPERM; + dasd_schedule_block_bh(block); + continue; + } + /* Non-temporary stop condition will trigger fail fast */ + if (block->base->stopped & ~DASD_STOPPED_PENDING && + test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && + (!dasd_eer_enabled(block->base))) { + cqr->status = DASD_CQR_FAILED; + cqr->intrc = -ENOLINK; + dasd_schedule_block_bh(block); + continue; + } + /* Don't try to start requests if device is stopped */ + if (block->base->stopped) + return; + + /* just a fail safe check, should not happen */ + if (!cqr->startdev) + cqr->startdev = block->base; + + /* make sure that the requests we submit find their way back */ + cqr->callback = dasd_return_cqr_cb; + + dasd_add_request_tail(cqr); + } +} + +/* + * Central dasd_block layer routine. Takes requests from the generic + * block layer request queue, creates ccw requests, enqueues them on + * a dasd_device and processes ccw requests that have been returned. + */ +static void dasd_block_tasklet(unsigned long data) +{ + struct dasd_block *block = (struct dasd_block *) data; + struct list_head final_queue; + struct list_head *l, *n; + struct dasd_ccw_req *cqr; + struct dasd_queue *dq; + + atomic_set(&block->tasklet_scheduled, 0); + INIT_LIST_HEAD(&final_queue); + spin_lock_irq(&block->queue_lock); + /* Finish off requests on ccw queue */ + __dasd_process_block_ccw_queue(block, &final_queue); + spin_unlock_irq(&block->queue_lock); + + /* Now call the callback function of requests with final status */ + list_for_each_safe(l, n, &final_queue) { + cqr = list_entry(l, struct dasd_ccw_req, blocklist); + dq = cqr->dq; + spin_lock_irq(&dq->lock); + list_del_init(&cqr->blocklist); + __dasd_cleanup_cqr(cqr); + spin_unlock_irq(&dq->lock); + } + + spin_lock_irq(&block->queue_lock); + /* Now check if the head of the ccw queue needs to be started. */ + __dasd_block_start_head(block); + spin_unlock_irq(&block->queue_lock); + + if (waitqueue_active(&shutdown_waitq)) + wake_up(&shutdown_waitq); + dasd_put_device(block->base); +} + +static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) +{ + wake_up(&dasd_flush_wq); +} + +/* + * Requeue a request back to the block request queue + * only works for block requests + */ +static int _dasd_requeue_request(struct dasd_ccw_req *cqr) +{ + struct dasd_block *block = cqr->block; + struct request *req; + + if (!block) + return -EINVAL; + /* + * If the request is an ERP request there is nothing to requeue. + * This will be done with the remaining original request. + */ + if (cqr->refers) + return 0; + spin_lock_irq(&cqr->dq->lock); + req = (struct request *) cqr->callback_data; + blk_mq_requeue_request(req, false); + spin_unlock_irq(&cqr->dq->lock); + + return 0; +} + +/* + * Go through all request on the dasd_block request queue, cancel them + * on the respective dasd_device, and return them to the generic + * block layer. + */ +static int dasd_flush_block_queue(struct dasd_block *block) +{ + struct dasd_ccw_req *cqr, *n; + int rc, i; + struct list_head flush_queue; + unsigned long flags; + + INIT_LIST_HEAD(&flush_queue); + spin_lock_bh(&block->queue_lock); + rc = 0; +restart: + list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { + /* if this request currently owned by a dasd_device cancel it */ + if (cqr->status >= DASD_CQR_QUEUED) + rc = dasd_cancel_req(cqr); + if (rc < 0) + break; + /* Rechain request (including erp chain) so it won't be + * touched by the dasd_block_tasklet anymore. + * Replace the callback so we notice when the request + * is returned from the dasd_device layer. + */ + cqr->callback = _dasd_wake_block_flush_cb; + for (i = 0; cqr != NULL; cqr = cqr->refers, i++) + list_move_tail(&cqr->blocklist, &flush_queue); + if (i > 1) + /* moved more than one request - need to restart */ + goto restart; + } + spin_unlock_bh(&block->queue_lock); + /* Now call the callback function of flushed requests */ +restart_cb: + list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { + wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); + /* Process finished ERP request. */ + if (cqr->refers) { + spin_lock_bh(&block->queue_lock); + __dasd_process_erp(block->base, cqr); + spin_unlock_bh(&block->queue_lock); + /* restart list_for_xx loop since dasd_process_erp + * might remove multiple elements */ + goto restart_cb; + } + /* call the callback function */ + spin_lock_irqsave(&cqr->dq->lock, flags); + cqr->endclk = get_tod_clock(); + list_del_init(&cqr->blocklist); + __dasd_cleanup_cqr(cqr); + spin_unlock_irqrestore(&cqr->dq->lock, flags); + } + return rc; +} + +/* + * Schedules a call to dasd_tasklet over the device tasklet. + */ +void dasd_schedule_block_bh(struct dasd_block *block) +{ + /* Protect against rescheduling. */ + if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) + return; + /* life cycle of block is bound to it's base device */ + dasd_get_device(block->base); + tasklet_hi_schedule(&block->tasklet); +} +EXPORT_SYMBOL(dasd_schedule_block_bh); + + +/* + * SECTION: external block device operations + * (request queue handling, open, release, etc.) + */ + +/* + * Dasd request queue function. Called from ll_rw_blk.c + */ +static blk_status_t do_dasd_request(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *qd) +{ + struct dasd_block *block = hctx->queue->queuedata; + struct dasd_queue *dq = hctx->driver_data; + struct request *req = qd->rq; + struct dasd_device *basedev; + struct dasd_ccw_req *cqr; + blk_status_t rc = BLK_STS_OK; + + basedev = block->base; + spin_lock_irq(&dq->lock); + if (basedev->state < DASD_STATE_READY || + test_bit(DASD_FLAG_OFFLINE, &basedev->flags)) { + DBF_DEV_EVENT(DBF_ERR, basedev, + "device not ready for request %p", req); + rc = BLK_STS_IOERR; + goto out; + } + + /* + * if device is stopped do not fetch new requests + * except failfast is active which will let requests fail + * immediately in __dasd_block_start_head() + */ + if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST)) { + DBF_DEV_EVENT(DBF_ERR, basedev, + "device stopped request %p", req); + rc = BLK_STS_RESOURCE; + goto out; + } + + if (basedev->features & DASD_FEATURE_READONLY && + rq_data_dir(req) == WRITE) { + DBF_DEV_EVENT(DBF_ERR, basedev, + "Rejecting write request %p", req); + rc = BLK_STS_IOERR; + goto out; + } + + if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) && + (basedev->features & DASD_FEATURE_FAILFAST || + blk_noretry_request(req))) { + DBF_DEV_EVENT(DBF_ERR, basedev, + "Rejecting failfast request %p", req); + rc = BLK_STS_IOERR; + goto out; + } + + cqr = basedev->discipline->build_cp(basedev, block, req); + if (IS_ERR(cqr)) { + if (PTR_ERR(cqr) == -EBUSY || + PTR_ERR(cqr) == -ENOMEM || + PTR_ERR(cqr) == -EAGAIN) { + rc = BLK_STS_RESOURCE; + goto out; + } + DBF_DEV_EVENT(DBF_ERR, basedev, + "CCW creation failed (rc=%ld) on request %p", + PTR_ERR(cqr), req); + rc = BLK_STS_IOERR; + goto out; + } + /* + * Note: callback is set to dasd_return_cqr_cb in + * __dasd_block_start_head to cover erp requests as well + */ + cqr->callback_data = req; + cqr->status = DASD_CQR_FILLED; + cqr->dq = dq; + + blk_mq_start_request(req); + spin_lock(&block->queue_lock); + list_add_tail(&cqr->blocklist, &block->ccw_queue); + INIT_LIST_HEAD(&cqr->devlist); + dasd_profile_start(block, cqr, req); + dasd_schedule_block_bh(block); + spin_unlock(&block->queue_lock); + +out: + spin_unlock_irq(&dq->lock); + return rc; +} + +/* + * Block timeout callback, called from the block layer + * + * Return values: + * BLK_EH_RESET_TIMER if the request should be left running + * BLK_EH_DONE if the request is handled or terminated + * by the driver. + */ +enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved) +{ + struct dasd_block *block = req->q->queuedata; + struct dasd_device *device; + struct dasd_ccw_req *cqr; + unsigned long flags; + int rc = 0; + + cqr = blk_mq_rq_to_pdu(req); + if (!cqr) + return BLK_EH_DONE; + + spin_lock_irqsave(&cqr->dq->lock, flags); + device = cqr->startdev ? cqr->startdev : block->base; + if (!device->blk_timeout) { + spin_unlock_irqrestore(&cqr->dq->lock, flags); + return BLK_EH_RESET_TIMER; + } + DBF_DEV_EVENT(DBF_WARNING, device, + " dasd_times_out cqr %p status %x", + cqr, cqr->status); + + spin_lock(&block->queue_lock); + spin_lock(get_ccwdev_lock(device->cdev)); + cqr->retries = -1; + cqr->intrc = -ETIMEDOUT; + if (cqr->status >= DASD_CQR_QUEUED) { + rc = __dasd_cancel_req(cqr); + } else if (cqr->status == DASD_CQR_FILLED || + cqr->status == DASD_CQR_NEED_ERP) { + cqr->status = DASD_CQR_TERMINATED; + } else if (cqr->status == DASD_CQR_IN_ERP) { + struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr; + + list_for_each_entry_safe(searchcqr, nextcqr, + &block->ccw_queue, blocklist) { + tmpcqr = searchcqr; + while (tmpcqr->refers) + tmpcqr = tmpcqr->refers; + if (tmpcqr != cqr) + continue; + /* searchcqr is an ERP request for cqr */ + searchcqr->retries = -1; + searchcqr->intrc = -ETIMEDOUT; + if (searchcqr->status >= DASD_CQR_QUEUED) { + rc = __dasd_cancel_req(searchcqr); + } else if ((searchcqr->status == DASD_CQR_FILLED) || + (searchcqr->status == DASD_CQR_NEED_ERP)) { + searchcqr->status = DASD_CQR_TERMINATED; + rc = 0; + } else if (searchcqr->status == DASD_CQR_IN_ERP) { + /* + * Shouldn't happen; most recent ERP + * request is at the front of queue + */ + continue; + } + break; + } + } + spin_unlock(get_ccwdev_lock(device->cdev)); + dasd_schedule_block_bh(block); + spin_unlock(&block->queue_lock); + spin_unlock_irqrestore(&cqr->dq->lock, flags); + + return rc ? BLK_EH_RESET_TIMER : BLK_EH_DONE; +} + +static int dasd_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int idx) +{ + struct dasd_queue *dq = kzalloc(sizeof(*dq), GFP_KERNEL); + + if (!dq) + return -ENOMEM; + + spin_lock_init(&dq->lock); + hctx->driver_data = dq; + + return 0; +} + +static void dasd_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int idx) +{ + kfree(hctx->driver_data); + hctx->driver_data = NULL; +} + +static void dasd_request_done(struct request *req) +{ + blk_mq_end_request(req, 0); + blk_mq_run_hw_queues(req->q, true); +} + +static struct blk_mq_ops dasd_mq_ops = { + .queue_rq = do_dasd_request, + .complete = dasd_request_done, + .timeout = dasd_times_out, + .init_hctx = dasd_init_hctx, + .exit_hctx = dasd_exit_hctx, +}; + +/* + * Allocate and initialize request queue and default I/O scheduler. + */ +static int dasd_alloc_queue(struct dasd_block *block) +{ + int rc; + + block->tag_set.ops = &dasd_mq_ops; + block->tag_set.cmd_size = sizeof(struct dasd_ccw_req); + block->tag_set.nr_hw_queues = nr_hw_queues; + block->tag_set.queue_depth = queue_depth; + block->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; + block->tag_set.numa_node = NUMA_NO_NODE; + + rc = blk_mq_alloc_tag_set(&block->tag_set); + if (rc) + return rc; + + block->request_queue = blk_mq_init_queue(&block->tag_set); + if (IS_ERR(block->request_queue)) + return PTR_ERR(block->request_queue); + + block->request_queue->queuedata = block; + + return 0; +} + +/* + * Allocate and initialize request queue. + */ +static void dasd_setup_queue(struct dasd_block *block) +{ + unsigned int logical_block_size = block->bp_block; + struct request_queue *q = block->request_queue; + unsigned int max_bytes, max_discard_sectors; + int max; + + if (block->base->features & DASD_FEATURE_USERAW) { + /* + * the max_blocks value for raw_track access is 256 + * it is higher than the native ECKD value because we + * only need one ccw per track + * so the max_hw_sectors are + * 2048 x 512B = 1024kB = 16 tracks + */ + max = 2048; + } else { + max = block->base->discipline->max_blocks << block->s2b_shift; + } + blk_queue_flag_set(QUEUE_FLAG_NONROT, q); + q->limits.max_dev_sectors = max; + blk_queue_logical_block_size(q, logical_block_size); + blk_queue_max_hw_sectors(q, max); + blk_queue_max_segments(q, USHRT_MAX); + /* with page sized segments we can translate each segement into + * one idaw/tidaw + */ + blk_queue_max_segment_size(q, PAGE_SIZE); + blk_queue_segment_boundary(q, PAGE_SIZE - 1); + + /* Only activate blocklayer discard support for devices that support it */ + if (block->base->features & DASD_FEATURE_DISCARD) { + q->limits.discard_granularity = logical_block_size; + q->limits.discard_alignment = PAGE_SIZE; + + /* Calculate max_discard_sectors and make it PAGE aligned */ + max_bytes = USHRT_MAX * logical_block_size; + max_bytes = ALIGN(max_bytes, PAGE_SIZE) - PAGE_SIZE; + max_discard_sectors = max_bytes / logical_block_size; + + blk_queue_max_discard_sectors(q, max_discard_sectors); + blk_queue_max_write_zeroes_sectors(q, max_discard_sectors); + blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); + } +} + +/* + * Deactivate and free request queue. + */ +static void dasd_free_queue(struct dasd_block *block) +{ + if (block->request_queue) { + blk_cleanup_queue(block->request_queue); + blk_mq_free_tag_set(&block->tag_set); + block->request_queue = NULL; + } +} + +static int dasd_open(struct block_device *bdev, fmode_t mode) +{ + struct dasd_device *base; + int rc; + + base = dasd_device_from_gendisk(bdev->bd_disk); + if (!base) + return -ENODEV; + + atomic_inc(&base->block->open_count); + if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { + rc = -ENODEV; + goto unlock; + } + + if (!try_module_get(base->discipline->owner)) { + rc = -EINVAL; + goto unlock; + } + + if (dasd_probeonly) { + dev_info(&base->cdev->dev, + "Accessing the DASD failed because it is in " + "probeonly mode\n"); + rc = -EPERM; + goto out; + } + + if (base->state <= DASD_STATE_BASIC) { + DBF_DEV_EVENT(DBF_ERR, base, " %s", + " Cannot open unrecognized device"); + rc = -ENODEV; + goto out; + } + + if ((mode & FMODE_WRITE) && + (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || + (base->features & DASD_FEATURE_READONLY))) { + rc = -EROFS; + goto out; + } + + dasd_put_device(base); + return 0; + +out: + module_put(base->discipline->owner); +unlock: + atomic_dec(&base->block->open_count); + dasd_put_device(base); + return rc; +} + +static void dasd_release(struct gendisk *disk, fmode_t mode) +{ + struct dasd_device *base = dasd_device_from_gendisk(disk); + if (base) { + atomic_dec(&base->block->open_count); + module_put(base->discipline->owner); + dasd_put_device(base); + } +} + +/* + * Return disk geometry. + */ +static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + struct dasd_device *base; + + base = dasd_device_from_gendisk(bdev->bd_disk); + if (!base) + return -ENODEV; + + if (!base->discipline || + !base->discipline->fill_geometry) { + dasd_put_device(base); + return -EINVAL; + } + base->discipline->fill_geometry(base->block, geo); + geo->start = get_start_sect(bdev) >> base->block->s2b_shift; + dasd_put_device(base); + return 0; +} + +const struct block_device_operations +dasd_device_operations = { + .owner = THIS_MODULE, + .open = dasd_open, + .release = dasd_release, + .ioctl = dasd_ioctl, + .compat_ioctl = dasd_ioctl, + .getgeo = dasd_getgeo, +}; + +/******************************************************************************* + * end of block device operations + */ + +static void +dasd_exit(void) +{ +#ifdef CONFIG_PROC_FS + dasd_proc_exit(); +#endif + dasd_eer_exit(); + if (dasd_page_cache != NULL) { + kmem_cache_destroy(dasd_page_cache); + dasd_page_cache = NULL; + } + dasd_gendisk_exit(); + dasd_devmap_exit(); + if (dasd_debug_area != NULL) { + debug_unregister(dasd_debug_area); + dasd_debug_area = NULL; + } + dasd_statistics_removeroot(); +} + +/* + * SECTION: common functions for ccw_driver use + */ + +/* + * Is the device read-only? + * Note that this function does not report the setting of the + * readonly device attribute, but how it is configured in z/VM. + */ +int dasd_device_is_ro(struct dasd_device *device) +{ + struct ccw_dev_id dev_id; + struct diag210 diag_data; + int rc; + + if (!MACHINE_IS_VM) + return 0; + ccw_device_get_id(device->cdev, &dev_id); + memset(&diag_data, 0, sizeof(diag_data)); + diag_data.vrdcdvno = dev_id.devno; + diag_data.vrdclen = sizeof(diag_data); + rc = diag210(&diag_data); + if (rc == 0 || rc == 2) { + return diag_data.vrdcvfla & 0x80; + } else { + DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", + dev_id.devno, rc); + return 0; + } +} +EXPORT_SYMBOL_GPL(dasd_device_is_ro); + +static void dasd_generic_auto_online(void *data, async_cookie_t cookie) +{ + struct ccw_device *cdev = data; + int ret; + + ret = ccw_device_set_online(cdev); + if (ret) + pr_warn("%s: Setting the DASD online failed with rc=%d\n", + dev_name(&cdev->dev), ret); +} + +/* + * Initial attempt at a probe function. this can be simplified once + * the other detection code is gone. + */ +int dasd_generic_probe(struct ccw_device *cdev, + struct dasd_discipline *discipline) +{ + int ret; + + ret = dasd_add_sysfs_files(cdev); + if (ret) { + DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", + "dasd_generic_probe: could not add " + "sysfs entries"); + return ret; + } + cdev->handler = &dasd_int_handler; + + /* + * Automatically online either all dasd devices (dasd_autodetect) + * or all devices specified with dasd= parameters during + * initial probe. + */ + if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || + (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) + async_schedule(dasd_generic_auto_online, cdev); + return 0; +} +EXPORT_SYMBOL_GPL(dasd_generic_probe); + +void dasd_generic_free_discipline(struct dasd_device *device) +{ + /* Forget the discipline information. */ + if (device->discipline) { + if (device->discipline->uncheck_device) + device->discipline->uncheck_device(device); + module_put(device->discipline->owner); + device->discipline = NULL; + } + if (device->base_discipline) { + module_put(device->base_discipline->owner); + device->base_discipline = NULL; + } +} +EXPORT_SYMBOL_GPL(dasd_generic_free_discipline); + +/* + * This will one day be called from a global not_oper handler. + * It is also used by driver_unregister during module unload. + */ +void dasd_generic_remove(struct ccw_device *cdev) +{ + struct dasd_device *device; + struct dasd_block *block; + + device = dasd_device_from_cdev(cdev); + if (IS_ERR(device)) { + dasd_remove_sysfs_files(cdev); + return; + } + if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) && + !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { + /* Already doing offline processing */ + dasd_put_device(device); + dasd_remove_sysfs_files(cdev); + return; + } + /* + * This device is removed unconditionally. Set offline + * flag to prevent dasd_open from opening it while it is + * no quite down yet. + */ + dasd_set_target_state(device, DASD_STATE_NEW); + cdev->handler = NULL; + /* dasd_delete_device destroys the device reference. */ + block = device->block; + dasd_delete_device(device); + /* + * life cycle of block is bound to device, so delete it after + * device was safely removed + */ + if (block) + dasd_free_block(block); + + dasd_remove_sysfs_files(cdev); +} +EXPORT_SYMBOL_GPL(dasd_generic_remove); + +/* + * Activate a device. This is called from dasd_{eckd,fba}_probe() when either + * the device is detected for the first time and is supposed to be used + * or the user has started activation through sysfs. + */ +int dasd_generic_set_online(struct ccw_device *cdev, + struct dasd_discipline *base_discipline) +{ + struct dasd_discipline *discipline; + struct dasd_device *device; + int rc; + + /* first online clears initial online feature flag */ + dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); + device = dasd_create_device(cdev); + if (IS_ERR(device)) + return PTR_ERR(device); + + discipline = base_discipline; + if (device->features & DASD_FEATURE_USEDIAG) { + if (!dasd_diag_discipline_pointer) { + /* Try to load the required module. */ + rc = request_module(DASD_DIAG_MOD); + if (rc) { + pr_warn("%s Setting the DASD online failed " + "because the required module %s " + "could not be loaded (rc=%d)\n", + dev_name(&cdev->dev), DASD_DIAG_MOD, + rc); + dasd_delete_device(device); + return -ENODEV; + } + } + /* Module init could have failed, so check again here after + * request_module(). */ + if (!dasd_diag_discipline_pointer) { + pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n", + dev_name(&cdev->dev)); + dasd_delete_device(device); + return -ENODEV; + } + discipline = dasd_diag_discipline_pointer; + } + if (!try_module_get(base_discipline->owner)) { + dasd_delete_device(device); + return -EINVAL; + } + if (!try_module_get(discipline->owner)) { + module_put(base_discipline->owner); + dasd_delete_device(device); + return -EINVAL; + } + device->base_discipline = base_discipline; + device->discipline = discipline; + + /* check_device will allocate block device if necessary */ + rc = discipline->check_device(device); + if (rc) { + pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n", + dev_name(&cdev->dev), discipline->name, rc); + module_put(discipline->owner); + module_put(base_discipline->owner); + dasd_delete_device(device); + return rc; + } + + dasd_set_target_state(device, DASD_STATE_ONLINE); + if (device->state <= DASD_STATE_KNOWN) { + pr_warn("%s Setting the DASD online failed because of a missing discipline\n", + dev_name(&cdev->dev)); + rc = -ENODEV; + dasd_set_target_state(device, DASD_STATE_NEW); + if (device->block) + dasd_free_block(device->block); + dasd_delete_device(device); + } else + pr_debug("dasd_generic device %s found\n", + dev_name(&cdev->dev)); + + wait_event(dasd_init_waitq, _wait_for_device(device)); + + dasd_put_device(device); + return rc; +} +EXPORT_SYMBOL_GPL(dasd_generic_set_online); + +int dasd_generic_set_offline(struct ccw_device *cdev) +{ + struct dasd_device *device; + struct dasd_block *block; + int max_count, open_count, rc; + unsigned long flags; + + rc = 0; + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + device = dasd_device_from_cdev_locked(cdev); + if (IS_ERR(device)) { + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + return PTR_ERR(device); + } + + /* + * We must make sure that this device is currently not in use. + * The open_count is increased for every opener, that includes + * the blkdev_get in dasd_scan_partitions. We are only interested + * in the other openers. + */ + if (device->block) { + max_count = device->block->bdev ? 0 : -1; + open_count = atomic_read(&device->block->open_count); + if (open_count > max_count) { + if (open_count > 0) + pr_warn("%s: The DASD cannot be set offline with open count %i\n", + dev_name(&cdev->dev), open_count); + else + pr_warn("%s: The DASD cannot be set offline while it is in use\n", + dev_name(&cdev->dev)); + rc = -EBUSY; + goto out_err; + } + } + + /* + * Test if the offline processing is already running and exit if so. + * If a safe offline is being processed this could only be a normal + * offline that should be able to overtake the safe offline and + * cancel any I/O we do not want to wait for any longer + */ + if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { + if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { + clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, + &device->flags); + } else { + rc = -EBUSY; + goto out_err; + } + } + set_bit(DASD_FLAG_OFFLINE, &device->flags); + + /* + * if safe_offline is called set safe_offline_running flag and + * clear safe_offline so that a call to normal offline + * can overrun safe_offline processing + */ + if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) && + !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { + /* need to unlock here to wait for outstanding I/O */ + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + /* + * If we want to set the device safe offline all IO operations + * should be finished before continuing the offline process + * so sync bdev first and then wait for our queues to become + * empty + */ + if (device->block) { + rc = fsync_bdev(device->block->bdev); + if (rc != 0) + goto interrupted; + } + dasd_schedule_device_bh(device); + rc = wait_event_interruptible(shutdown_waitq, + _wait_for_empty_queues(device)); + if (rc != 0) + goto interrupted; + + /* + * check if a normal offline process overtook the offline + * processing in this case simply do nothing beside returning + * that we got interrupted + * otherwise mark safe offline as not running any longer and + * continue with normal offline + */ + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + if (!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { + rc = -ERESTARTSYS; + goto out_err; + } + clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags); + } + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + + dasd_set_target_state(device, DASD_STATE_NEW); + /* dasd_delete_device destroys the device reference. */ + block = device->block; + dasd_delete_device(device); + /* + * life cycle of block is bound to device, so delete it after + * device was safely removed + */ + if (block) + dasd_free_block(block); + + return 0; + +interrupted: + /* interrupted by signal */ + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags); + clear_bit(DASD_FLAG_OFFLINE, &device->flags); +out_err: + dasd_put_device(device); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + return rc; +} +EXPORT_SYMBOL_GPL(dasd_generic_set_offline); + +int dasd_generic_last_path_gone(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr; + + dev_warn(&device->cdev->dev, "No operational channel path is left " + "for the device\n"); + DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); + /* First of all call extended error reporting. */ + dasd_eer_write(device, NULL, DASD_EER_NOPATH); + + if (device->state < DASD_STATE_BASIC) + return 0; + /* Device is active. We want to keep it. */ + list_for_each_entry(cqr, &device->ccw_queue, devlist) + if ((cqr->status == DASD_CQR_IN_IO) || + (cqr->status == DASD_CQR_CLEAR_PENDING)) { + cqr->status = DASD_CQR_QUEUED; + cqr->retries++; + } + dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); + dasd_device_clear_timer(device); + dasd_schedule_device_bh(device); + return 1; +} +EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); + +int dasd_generic_path_operational(struct dasd_device *device) +{ + dev_info(&device->cdev->dev, "A channel path to the device has become " + "operational\n"); + DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); + dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); + if (device->stopped & DASD_UNRESUMED_PM) { + dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); + dasd_restore_device(device); + return 1; + } + dasd_schedule_device_bh(device); + if (device->block) { + dasd_schedule_block_bh(device->block); + if (device->block->request_queue) + blk_mq_run_hw_queues(device->block->request_queue, + true); + } + + if (!device->stopped) + wake_up(&generic_waitq); + + return 1; +} +EXPORT_SYMBOL_GPL(dasd_generic_path_operational); + +int dasd_generic_notify(struct ccw_device *cdev, int event) +{ + struct dasd_device *device; + int ret; + + device = dasd_device_from_cdev_locked(cdev); + if (IS_ERR(device)) + return 0; + ret = 0; + switch (event) { + case CIO_GONE: + case CIO_BOXED: + case CIO_NO_PATH: + dasd_path_no_path(device); + ret = dasd_generic_last_path_gone(device); + break; + case CIO_OPER: + ret = 1; + if (dasd_path_get_opm(device)) + ret = dasd_generic_path_operational(device); + break; + } + dasd_put_device(device); + return ret; +} +EXPORT_SYMBOL_GPL(dasd_generic_notify); + +void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) +{ + struct dasd_device *device; + int chp, oldopm, hpfpm, ifccpm; + + device = dasd_device_from_cdev_locked(cdev); + if (IS_ERR(device)) + return; + + oldopm = dasd_path_get_opm(device); + for (chp = 0; chp < 8; chp++) { + if (path_event[chp] & PE_PATH_GONE) { + dasd_path_notoper(device, chp); + } + if (path_event[chp] & PE_PATH_AVAILABLE) { + dasd_path_available(device, chp); + dasd_schedule_device_bh(device); + } + if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) { + if (!dasd_path_is_operational(device, chp) && + !dasd_path_need_verify(device, chp)) { + /* + * we can not establish a pathgroup on an + * unavailable path, so trigger a path + * verification first + */ + dasd_path_available(device, chp); + dasd_schedule_device_bh(device); + } + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Pathgroup re-established\n"); + if (device->discipline->kick_validate) + device->discipline->kick_validate(device); + } + } + hpfpm = dasd_path_get_hpfpm(device); + ifccpm = dasd_path_get_ifccpm(device); + if (!dasd_path_get_opm(device) && hpfpm) { + /* + * device has no operational paths but at least one path is + * disabled due to HPF errors + * disable HPF at all and use the path(s) again + */ + if (device->discipline->disable_hpf) + device->discipline->disable_hpf(device); + dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC); + dasd_path_set_tbvpm(device, hpfpm); + dasd_schedule_device_bh(device); + dasd_schedule_requeue(device); + } else if (!dasd_path_get_opm(device) && ifccpm) { + /* + * device has no operational paths but at least one path is + * disabled due to IFCC errors + * trigger path verification on paths with IFCC errors + */ + dasd_path_set_tbvpm(device, ifccpm); + dasd_schedule_device_bh(device); + } + if (oldopm && !dasd_path_get_opm(device) && !hpfpm && !ifccpm) { + dev_warn(&device->cdev->dev, + "No verified channel paths remain for the device\n"); + DBF_DEV_EVENT(DBF_WARNING, device, + "%s", "last verified path gone"); + dasd_eer_write(device, NULL, DASD_EER_NOPATH); + dasd_device_set_stop_bits(device, + DASD_STOPPED_DC_WAIT); + } + dasd_put_device(device); +} +EXPORT_SYMBOL_GPL(dasd_generic_path_event); + +int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) +{ + if (!dasd_path_get_opm(device) && lpm) { + dasd_path_set_opm(device, lpm); + dasd_generic_path_operational(device); + } else + dasd_path_add_opm(device, lpm); + return 0; +} +EXPORT_SYMBOL_GPL(dasd_generic_verify_path); + +/* + * clear active requests and requeue them to block layer if possible + */ +static int dasd_generic_requeue_all_requests(struct dasd_device *device) +{ + struct list_head requeue_queue; + struct dasd_ccw_req *cqr, *n; + struct dasd_ccw_req *refers; + int rc; + + INIT_LIST_HEAD(&requeue_queue); + spin_lock_irq(get_ccwdev_lock(device->cdev)); + rc = 0; + list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { + /* Check status and move request to flush_queue */ + if (cqr->status == DASD_CQR_IN_IO) { + rc = device->discipline->term_IO(cqr); + if (rc) { + /* unable to terminate requeust */ + dev_err(&device->cdev->dev, + "Unable to terminate request %p " + "on suspend\n", cqr); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + dasd_put_device(device); + return rc; + } + } + list_move_tail(&cqr->devlist, &requeue_queue); + } + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + + list_for_each_entry_safe(cqr, n, &requeue_queue, devlist) { + wait_event(dasd_flush_wq, + (cqr->status != DASD_CQR_CLEAR_PENDING)); + + /* + * requeue requests to blocklayer will only work + * for block device requests + */ + if (_dasd_requeue_request(cqr)) + continue; + + /* remove requests from device and block queue */ + list_del_init(&cqr->devlist); + while (cqr->refers != NULL) { + refers = cqr->refers; + /* remove the request from the block queue */ + list_del(&cqr->blocklist); + /* free the finished erp request */ + dasd_free_erp_request(cqr, cqr->memdev); + cqr = refers; + } + + /* + * _dasd_requeue_request already checked for a valid + * blockdevice, no need to check again + * all erp requests (cqr->refers) have a cqr->block + * pointer copy from the original cqr + */ + list_del_init(&cqr->blocklist); + cqr->block->base->discipline->free_cp( + cqr, (struct request *) cqr->callback_data); + } + + /* + * if requests remain then they are internal request + * and go back to the device queue + */ + if (!list_empty(&requeue_queue)) { + /* move freeze_queue to start of the ccw_queue */ + spin_lock_irq(get_ccwdev_lock(device->cdev)); + list_splice_tail(&requeue_queue, &device->ccw_queue); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + } + dasd_schedule_device_bh(device); + return rc; +} + +static void do_requeue_requests(struct work_struct *work) +{ + struct dasd_device *device = container_of(work, struct dasd_device, + requeue_requests); + dasd_generic_requeue_all_requests(device); + dasd_device_remove_stop_bits(device, DASD_STOPPED_NOT_ACC); + if (device->block) + dasd_schedule_block_bh(device->block); + dasd_put_device(device); +} + +void dasd_schedule_requeue(struct dasd_device *device) +{ + dasd_get_device(device); + /* queue call to dasd_reload_device to the kernel event daemon. */ + if (!schedule_work(&device->requeue_requests)) + dasd_put_device(device); +} +EXPORT_SYMBOL(dasd_schedule_requeue); + +int dasd_generic_pm_freeze(struct ccw_device *cdev) +{ + struct dasd_device *device = dasd_device_from_cdev(cdev); + + if (IS_ERR(device)) + return PTR_ERR(device); + + /* mark device as suspended */ + set_bit(DASD_FLAG_SUSPENDED, &device->flags); + + if (device->discipline->freeze) + device->discipline->freeze(device); + + /* disallow new I/O */ + dasd_device_set_stop_bits(device, DASD_STOPPED_PM); + + return dasd_generic_requeue_all_requests(device); +} +EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); + +int dasd_generic_restore_device(struct ccw_device *cdev) +{ + struct dasd_device *device = dasd_device_from_cdev(cdev); + int rc = 0; + + if (IS_ERR(device)) + return PTR_ERR(device); + + /* allow new IO again */ + dasd_device_remove_stop_bits(device, + (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); + + dasd_schedule_device_bh(device); + + /* + * call discipline restore function + * if device is stopped do nothing e.g. for disconnected devices + */ + if (device->discipline->restore && !(device->stopped)) + rc = device->discipline->restore(device); + if (rc || device->stopped) + /* + * if the resume failed for the DASD we put it in + * an UNRESUMED stop state + */ + device->stopped |= DASD_UNRESUMED_PM; + + if (device->block) { + dasd_schedule_block_bh(device->block); + if (device->block->request_queue) + blk_mq_run_hw_queues(device->block->request_queue, + true); + } + + clear_bit(DASD_FLAG_SUSPENDED, &device->flags); + dasd_put_device(device); + return 0; +} +EXPORT_SYMBOL_GPL(dasd_generic_restore_device); + +static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, + void *rdc_buffer, + int rdc_buffer_size, + int magic) +{ + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + unsigned long *idaw; + + cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device, + NULL); + + if (IS_ERR(cqr)) { + /* internal error 13 - Allocating the RDC request failed*/ + dev_err(&device->cdev->dev, + "An error occurred in the DASD device driver, " + "reason=%s\n", "13"); + return cqr; + } + + ccw = cqr->cpaddr; + ccw->cmd_code = CCW_CMD_RDC; + if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { + idaw = (unsigned long *) (cqr->data); + ccw->cda = (__u32)(addr_t) idaw; + ccw->flags = CCW_FLAG_IDA; + idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); + } else { + ccw->cda = (__u32)(addr_t) rdc_buffer; + ccw->flags = 0; + } + + ccw->count = rdc_buffer_size; + cqr->startdev = device; + cqr->memdev = device; + cqr->expires = 10*HZ; + cqr->retries = 256; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + return cqr; +} + + +int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, + void *rdc_buffer, int rdc_buffer_size) +{ + int ret; + struct dasd_ccw_req *cqr; + + cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, + magic); + if (IS_ERR(cqr)) + return PTR_ERR(cqr); + + ret = dasd_sleep_on(cqr); + dasd_sfree_request(cqr, cqr->memdev); + return ret; +} +EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); + +/* + * In command mode and transport mode we need to look for sense + * data in different places. The sense data itself is allways + * an array of 32 bytes, so we can unify the sense data access + * for both modes. + */ +char *dasd_get_sense(struct irb *irb) +{ + struct tsb *tsb = NULL; + char *sense = NULL; + + if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { + if (irb->scsw.tm.tcw) + tsb = tcw_get_tsb((struct tcw *)(unsigned long) + irb->scsw.tm.tcw); + if (tsb && tsb->length == 64 && tsb->flags) + switch (tsb->flags & 0x07) { + case 1: /* tsa_iostat */ + sense = tsb->tsa.iostat.sense; + break; + case 2: /* tsa_ddpc */ + sense = tsb->tsa.ddpc.sense; + break; + default: + /* currently we don't use interrogate data */ + break; + } + } else if (irb->esw.esw0.erw.cons) { + sense = irb->ecw; + } + return sense; +} +EXPORT_SYMBOL_GPL(dasd_get_sense); + +void dasd_generic_shutdown(struct ccw_device *cdev) +{ + struct dasd_device *device; + + device = dasd_device_from_cdev(cdev); + if (IS_ERR(device)) + return; + + if (device->block) + dasd_schedule_block_bh(device->block); + + dasd_schedule_device_bh(device); + + wait_event(shutdown_waitq, _wait_for_empty_queues(device)); +} +EXPORT_SYMBOL_GPL(dasd_generic_shutdown); + +static int __init dasd_init(void) +{ + int rc; + + init_waitqueue_head(&dasd_init_waitq); + init_waitqueue_head(&dasd_flush_wq); + init_waitqueue_head(&generic_waitq); + init_waitqueue_head(&shutdown_waitq); + + /* register 'common' DASD debug area, used for all DBF_XXX calls */ + dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); + if (dasd_debug_area == NULL) { + rc = -ENOMEM; + goto failed; + } + debug_register_view(dasd_debug_area, &debug_sprintf_view); + debug_set_level(dasd_debug_area, DBF_WARNING); + + DBF_EVENT(DBF_EMERG, "%s", "debug area created"); + + dasd_diag_discipline_pointer = NULL; + + dasd_statistics_createroot(); + + rc = dasd_devmap_init(); + if (rc) + goto failed; + rc = dasd_gendisk_init(); + if (rc) + goto failed; + rc = dasd_parse(); + if (rc) + goto failed; + rc = dasd_eer_init(); + if (rc) + goto failed; +#ifdef CONFIG_PROC_FS + rc = dasd_proc_init(); + if (rc) + goto failed; +#endif + + return 0; +failed: + pr_info("The DASD device driver could not be initialized\n"); + dasd_exit(); + return rc; +} + +module_init(dasd_init); +module_exit(dasd_exit); diff --git a/drivers/s390/block/dasd_3990_erp.c b/drivers/s390/block/dasd_3990_erp.c new file mode 100644 index 000000000..ee73b0607 --- /dev/null +++ b/drivers/s390/block/dasd_3990_erp.c @@ -0,0 +1,2854 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Horst Hummel + * Holger Smolinski + * Bugreports.to..: + * Copyright IBM Corp. 2000, 2001 + * + */ + +#define KMSG_COMPONENT "dasd-eckd" + +#include +#include + +#define PRINTK_HEADER "dasd_erp(3990): " + +#include "dasd_int.h" +#include "dasd_eckd.h" + + +struct DCTL_data { + unsigned char subcommand; /* e.g Inhibit Write, Enable Write,... */ + unsigned char modifier; /* Subcommand modifier */ + unsigned short res; /* reserved */ +} __attribute__ ((packed)); + +/* + ***************************************************************************** + * SECTION ERP HANDLING + ***************************************************************************** + */ +/* + ***************************************************************************** + * 24 and 32 byte sense ERP functions + ***************************************************************************** + */ + +/* + * DASD_3990_ERP_CLEANUP + * + * DESCRIPTION + * Removes the already build but not necessary ERP request and sets + * the status of the original cqr / erp to the given (final) status + * + * PARAMETER + * erp request to be blocked + * final_status either DASD_CQR_DONE or DASD_CQR_FAILED + * + * RETURN VALUES + * cqr original cqr + */ +static struct dasd_ccw_req * +dasd_3990_erp_cleanup(struct dasd_ccw_req * erp, char final_status) +{ + struct dasd_ccw_req *cqr = erp->refers; + + dasd_free_erp_request(erp, erp->memdev); + cqr->status = final_status; + return cqr; + +} /* end dasd_3990_erp_cleanup */ + +/* + * DASD_3990_ERP_BLOCK_QUEUE + * + * DESCRIPTION + * Block the given device request queue to prevent from further + * processing until the started timer has expired or an related + * interrupt was received. + */ +static void dasd_3990_erp_block_queue(struct dasd_ccw_req *erp, int expires) +{ + + struct dasd_device *device = erp->startdev; + unsigned long flags; + + DBF_DEV_EVENT(DBF_INFO, device, + "blocking request queue for %is", expires/HZ); + + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + dasd_device_set_stop_bits(device, DASD_STOPPED_PENDING); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + erp->status = DASD_CQR_FILLED; + if (erp->block) + dasd_block_set_timer(erp->block, expires); + else + dasd_device_set_timer(device, expires); +} + +/* + * DASD_3990_ERP_INT_REQ + * + * DESCRIPTION + * Handles 'Intervention Required' error. + * This means either device offline or not installed. + * + * PARAMETER + * erp current erp + * RETURN VALUES + * erp modified erp + */ +static struct dasd_ccw_req * +dasd_3990_erp_int_req(struct dasd_ccw_req * erp) +{ + + struct dasd_device *device = erp->startdev; + + /* first time set initial retry counter and erp_function */ + /* and retry once without blocking queue */ + /* (this enables easier enqueing of the cqr) */ + if (erp->function != dasd_3990_erp_int_req) { + + erp->retries = 256; + erp->function = dasd_3990_erp_int_req; + + } else { + + /* issue a message and wait for 'device ready' interrupt */ + dev_err(&device->cdev->dev, + "is offline or not installed - " + "INTERVENTION REQUIRED!!\n"); + + dasd_3990_erp_block_queue(erp, 60*HZ); + } + + return erp; + +} /* end dasd_3990_erp_int_req */ + +/* + * DASD_3990_ERP_ALTERNATE_PATH + * + * DESCRIPTION + * Repeat the operation on a different channel path. + * If all alternate paths have been tried, the request is posted with a + * permanent error. + * + * PARAMETER + * erp pointer to the current ERP + * + * RETURN VALUES + * erp modified pointer to the ERP + */ +static void +dasd_3990_erp_alternate_path(struct dasd_ccw_req * erp) +{ + struct dasd_device *device = erp->startdev; + __u8 opm; + unsigned long flags; + + /* try alternate valid path */ + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + opm = ccw_device_get_path_mask(device->cdev); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + if (erp->lpm == 0) + erp->lpm = dasd_path_get_opm(device) & + ~(erp->irb.esw.esw0.sublog.lpum); + else + erp->lpm &= ~(erp->irb.esw.esw0.sublog.lpum); + + if ((erp->lpm & opm) != 0x00) { + + DBF_DEV_EVENT(DBF_WARNING, device, + "try alternate lpm=%x (lpum=%x / opm=%x)", + erp->lpm, erp->irb.esw.esw0.sublog.lpum, opm); + + /* reset status to submit the request again... */ + erp->status = DASD_CQR_FILLED; + erp->retries = 10; + } else { + dev_err(&device->cdev->dev, + "The DASD cannot be reached on any path (lpum=%x" + "/opm=%x)\n", erp->irb.esw.esw0.sublog.lpum, opm); + + /* post request with permanent error */ + erp->status = DASD_CQR_FAILED; + } +} /* end dasd_3990_erp_alternate_path */ + +/* + * DASD_3990_ERP_DCTL + * + * DESCRIPTION + * Setup cqr to do the Diagnostic Control (DCTL) command with an + * Inhibit Write subcommand (0x20) and the given modifier. + * + * PARAMETER + * erp pointer to the current (failed) ERP + * modifier subcommand modifier + * + * RETURN VALUES + * dctl_cqr pointer to NEW dctl_cqr + * + */ +static struct dasd_ccw_req * +dasd_3990_erp_DCTL(struct dasd_ccw_req * erp, char modifier) +{ + + struct dasd_device *device = erp->startdev; + struct DCTL_data *DCTL_data; + struct ccw1 *ccw; + struct dasd_ccw_req *dctl_cqr; + + dctl_cqr = dasd_alloc_erp_request((char *) &erp->magic, 1, + sizeof(struct DCTL_data), + device); + if (IS_ERR(dctl_cqr)) { + dev_err(&device->cdev->dev, + "Unable to allocate DCTL-CQR\n"); + erp->status = DASD_CQR_FAILED; + return erp; + } + + DCTL_data = dctl_cqr->data; + + DCTL_data->subcommand = 0x02; /* Inhibit Write */ + DCTL_data->modifier = modifier; + + ccw = dctl_cqr->cpaddr; + memset(ccw, 0, sizeof(struct ccw1)); + ccw->cmd_code = CCW_CMD_DCTL; + ccw->count = 4; + ccw->cda = (__u32)(addr_t) DCTL_data; + dctl_cqr->flags = erp->flags; + dctl_cqr->function = dasd_3990_erp_DCTL; + dctl_cqr->refers = erp; + dctl_cqr->startdev = device; + dctl_cqr->memdev = device; + dctl_cqr->magic = erp->magic; + dctl_cqr->expires = 5 * 60 * HZ; + dctl_cqr->retries = 2; + + dctl_cqr->buildclk = get_tod_clock(); + + dctl_cqr->status = DASD_CQR_FILLED; + + return dctl_cqr; + +} /* end dasd_3990_erp_DCTL */ + +/* + * DASD_3990_ERP_ACTION_1 + * + * DESCRIPTION + * Setup ERP to do the ERP action 1 (see Reference manual). + * Repeat the operation on a different channel path. + * As deviation from the recommended recovery action, we reset the path mask + * after we have tried each path and go through all paths a second time. + * This will cover situations where only one path at a time is actually down, + * but all paths fail and recover just with the same sequence and timing as + * we try to use them (flapping links). + * If all alternate paths have been tried twice, the request is posted with + * a permanent error. + * + * PARAMETER + * erp pointer to the current ERP + * + * RETURN VALUES + * erp pointer to the ERP + * + */ +static struct dasd_ccw_req *dasd_3990_erp_action_1_sec(struct dasd_ccw_req *erp) +{ + erp->function = dasd_3990_erp_action_1_sec; + dasd_3990_erp_alternate_path(erp); + return erp; +} + +static struct dasd_ccw_req *dasd_3990_erp_action_1(struct dasd_ccw_req *erp) +{ + erp->function = dasd_3990_erp_action_1; + dasd_3990_erp_alternate_path(erp); + if (erp->status == DASD_CQR_FAILED && + !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) { + erp->status = DASD_CQR_FILLED; + erp->retries = 10; + erp->lpm = dasd_path_get_opm(erp->startdev); + erp->function = dasd_3990_erp_action_1_sec; + } + return erp; +} /* end dasd_3990_erp_action_1(b) */ + +/* + * DASD_3990_ERP_ACTION_4 + * + * DESCRIPTION + * Setup ERP to do the ERP action 4 (see Reference manual). + * Set the current request to PENDING to block the CQR queue for that device + * until the state change interrupt appears. + * Use a timer (20 seconds) to retry the cqr if the interrupt is still + * missing. + * + * PARAMETER + * sense sense data of the actual error + * erp pointer to the current ERP + * + * RETURN VALUES + * erp pointer to the ERP + * + */ +static struct dasd_ccw_req * +dasd_3990_erp_action_4(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_device *device = erp->startdev; + + /* first time set initial retry counter and erp_function */ + /* and retry once without waiting for state change pending */ + /* interrupt (this enables easier enqueing of the cqr) */ + if (erp->function != dasd_3990_erp_action_4) { + + DBF_DEV_EVENT(DBF_INFO, device, "%s", + "dasd_3990_erp_action_4: first time retry"); + + erp->retries = 256; + erp->function = dasd_3990_erp_action_4; + + } else { + if (sense && (sense[25] == 0x1D)) { /* state change pending */ + + DBF_DEV_EVENT(DBF_INFO, device, + "waiting for state change pending " + "interrupt, %d retries left", + erp->retries); + + dasd_3990_erp_block_queue(erp, 30*HZ); + + } else if (sense && (sense[25] == 0x1E)) { /* busy */ + DBF_DEV_EVENT(DBF_INFO, device, + "busy - redriving request later, " + "%d retries left", + erp->retries); + dasd_3990_erp_block_queue(erp, HZ); + } else { + /* no state change pending - retry */ + DBF_DEV_EVENT(DBF_INFO, device, + "redriving request immediately, " + "%d retries left", + erp->retries); + erp->status = DASD_CQR_FILLED; + } + } + + return erp; + +} /* end dasd_3990_erp_action_4 */ + +/* + ***************************************************************************** + * 24 byte sense ERP functions (only) + ***************************************************************************** + */ + +/* + * DASD_3990_ERP_ACTION_5 + * + * DESCRIPTION + * Setup ERP to do the ERP action 5 (see Reference manual). + * NOTE: Further handling is done in xxx_further_erp after the retries. + * + * PARAMETER + * erp pointer to the current ERP + * + * RETURN VALUES + * erp pointer to the ERP + * + */ +static struct dasd_ccw_req * +dasd_3990_erp_action_5(struct dasd_ccw_req * erp) +{ + + /* first of all retry */ + erp->retries = 10; + erp->function = dasd_3990_erp_action_5; + + return erp; + +} /* end dasd_3990_erp_action_5 */ + +/* + * DASD_3990_HANDLE_ENV_DATA + * + * DESCRIPTION + * Handles 24 byte 'Environmental data present'. + * Does a analysis of the sense data (message Format) + * and prints the error messages. + * + * PARAMETER + * sense current sense data + * + * RETURN VALUES + * void + */ +static void +dasd_3990_handle_env_data(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_device *device = erp->startdev; + char msg_format = (sense[7] & 0xF0); + char msg_no = (sense[7] & 0x0F); + char errorstring[ERRORLENGTH]; + + switch (msg_format) { + case 0x00: /* Format 0 - Program or System Checks */ + + if (sense[1] & 0x10) { /* check message to operator bit */ + + switch (msg_no) { + case 0x00: /* No Message */ + break; + case 0x01: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Invalid Command\n"); + break; + case 0x02: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Invalid Command " + "Sequence\n"); + break; + case 0x03: + dev_warn(&device->cdev->dev, + "FORMAT 0 - CCW Count less than " + "required\n"); + break; + case 0x04: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Invalid Parameter\n"); + break; + case 0x05: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Diagnostic of Special" + " Command Violates File Mask\n"); + break; + case 0x07: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Channel Returned with " + "Incorrect retry CCW\n"); + break; + case 0x08: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Reset Notification\n"); + break; + case 0x09: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Storage Path Restart\n"); + break; + case 0x0A: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Channel requested " + "... %02x\n", sense[8]); + break; + case 0x0B: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Invalid Defective/" + "Alternate Track Pointer\n"); + break; + case 0x0C: + dev_warn(&device->cdev->dev, + "FORMAT 0 - DPS Installation " + "Check\n"); + break; + case 0x0E: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Command Invalid on " + "Secondary Address\n"); + break; + case 0x0F: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Status Not As " + "Required: reason %02x\n", + sense[8]); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Reserved\n"); + } + } else { + switch (msg_no) { + case 0x00: /* No Message */ + break; + case 0x01: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Device Error " + "Source\n"); + break; + case 0x02: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Reserved\n"); + break; + case 0x03: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Device Fenced - " + "device = %02x\n", sense[4]); + break; + case 0x04: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Data Pinned for " + "Device\n"); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 0 - Reserved\n"); + } + } + break; + + case 0x10: /* Format 1 - Device Equipment Checks */ + switch (msg_no) { + case 0x00: /* No Message */ + break; + case 0x01: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Device Status 1 not as " + "expected\n"); + break; + case 0x03: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Index missing\n"); + break; + case 0x04: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Interruption cannot be " + "reset\n"); + break; + case 0x05: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Device did not respond to " + "selection\n"); + break; + case 0x06: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Device check-2 error or Set " + "Sector is not complete\n"); + break; + case 0x07: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Head address does not " + "compare\n"); + break; + case 0x08: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Device status 1 not valid\n"); + break; + case 0x09: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Device not ready\n"); + break; + case 0x0A: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Track physical address did " + "not compare\n"); + break; + case 0x0B: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Missing device address bit\n"); + break; + case 0x0C: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Drive motor switch is off\n"); + break; + case 0x0D: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Seek incomplete\n"); + break; + case 0x0E: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Cylinder address did not " + "compare\n"); + break; + case 0x0F: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Offset active cannot be " + "reset\n"); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 1 - Reserved\n"); + } + break; + + case 0x20: /* Format 2 - 3990 Equipment Checks */ + switch (msg_no) { + case 0x08: + dev_warn(&device->cdev->dev, + "FORMAT 2 - 3990 check-2 error\n"); + break; + case 0x0E: + dev_warn(&device->cdev->dev, + "FORMAT 2 - Support facility errors\n"); + break; + case 0x0F: + dev_warn(&device->cdev->dev, + "FORMAT 2 - Microcode detected error " + "%02x\n", + sense[8]); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 2 - Reserved\n"); + } + break; + + case 0x30: /* Format 3 - 3990 Control Checks */ + switch (msg_no) { + case 0x0F: + dev_warn(&device->cdev->dev, + "FORMAT 3 - Allegiance terminated\n"); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 3 - Reserved\n"); + } + break; + + case 0x40: /* Format 4 - Data Checks */ + switch (msg_no) { + case 0x00: + dev_warn(&device->cdev->dev, + "FORMAT 4 - Home address area error\n"); + break; + case 0x01: + dev_warn(&device->cdev->dev, + "FORMAT 4 - Count area error\n"); + break; + case 0x02: + dev_warn(&device->cdev->dev, + "FORMAT 4 - Key area error\n"); + break; + case 0x03: + dev_warn(&device->cdev->dev, + "FORMAT 4 - Data area error\n"); + break; + case 0x04: + dev_warn(&device->cdev->dev, + "FORMAT 4 - No sync byte in home address " + "area\n"); + break; + case 0x05: + dev_warn(&device->cdev->dev, + "FORMAT 4 - No sync byte in count address " + "area\n"); + break; + case 0x06: + dev_warn(&device->cdev->dev, + "FORMAT 4 - No sync byte in key area\n"); + break; + case 0x07: + dev_warn(&device->cdev->dev, + "FORMAT 4 - No sync byte in data area\n"); + break; + case 0x08: + dev_warn(&device->cdev->dev, + "FORMAT 4 - Home address area error; " + "offset active\n"); + break; + case 0x09: + dev_warn(&device->cdev->dev, + "FORMAT 4 - Count area error; offset " + "active\n"); + break; + case 0x0A: + dev_warn(&device->cdev->dev, + "FORMAT 4 - Key area error; offset " + "active\n"); + break; + case 0x0B: + dev_warn(&device->cdev->dev, + "FORMAT 4 - Data area error; " + "offset active\n"); + break; + case 0x0C: + dev_warn(&device->cdev->dev, + "FORMAT 4 - No sync byte in home " + "address area; offset active\n"); + break; + case 0x0D: + dev_warn(&device->cdev->dev, + "FORMAT 4 - No sync byte in count " + "address area; offset active\n"); + break; + case 0x0E: + dev_warn(&device->cdev->dev, + "FORMAT 4 - No sync byte in key area; " + "offset active\n"); + break; + case 0x0F: + dev_warn(&device->cdev->dev, + "FORMAT 4 - No sync byte in data area; " + "offset active\n"); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 4 - Reserved\n"); + } + break; + + case 0x50: /* Format 5 - Data Check with displacement information */ + switch (msg_no) { + case 0x00: + dev_warn(&device->cdev->dev, + "FORMAT 5 - Data Check in the " + "home address area\n"); + break; + case 0x01: + dev_warn(&device->cdev->dev, + "FORMAT 5 - Data Check in the count " + "area\n"); + break; + case 0x02: + dev_warn(&device->cdev->dev, + "FORMAT 5 - Data Check in the key area\n"); + break; + case 0x03: + dev_warn(&device->cdev->dev, + "FORMAT 5 - Data Check in the data " + "area\n"); + break; + case 0x08: + dev_warn(&device->cdev->dev, + "FORMAT 5 - Data Check in the " + "home address area; offset active\n"); + break; + case 0x09: + dev_warn(&device->cdev->dev, + "FORMAT 5 - Data Check in the count area; " + "offset active\n"); + break; + case 0x0A: + dev_warn(&device->cdev->dev, + "FORMAT 5 - Data Check in the key area; " + "offset active\n"); + break; + case 0x0B: + dev_warn(&device->cdev->dev, + "FORMAT 5 - Data Check in the data area; " + "offset active\n"); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 5 - Reserved\n"); + } + break; + + case 0x60: /* Format 6 - Usage Statistics/Overrun Errors */ + switch (msg_no) { + case 0x00: + dev_warn(&device->cdev->dev, + "FORMAT 6 - Overrun on channel A\n"); + break; + case 0x01: + dev_warn(&device->cdev->dev, + "FORMAT 6 - Overrun on channel B\n"); + break; + case 0x02: + dev_warn(&device->cdev->dev, + "FORMAT 6 - Overrun on channel C\n"); + break; + case 0x03: + dev_warn(&device->cdev->dev, + "FORMAT 6 - Overrun on channel D\n"); + break; + case 0x04: + dev_warn(&device->cdev->dev, + "FORMAT 6 - Overrun on channel E\n"); + break; + case 0x05: + dev_warn(&device->cdev->dev, + "FORMAT 6 - Overrun on channel F\n"); + break; + case 0x06: + dev_warn(&device->cdev->dev, + "FORMAT 6 - Overrun on channel G\n"); + break; + case 0x07: + dev_warn(&device->cdev->dev, + "FORMAT 6 - Overrun on channel H\n"); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 6 - Reserved\n"); + } + break; + + case 0x70: /* Format 7 - Device Connection Control Checks */ + switch (msg_no) { + case 0x00: + dev_warn(&device->cdev->dev, + "FORMAT 7 - RCC initiated by a connection " + "check alert\n"); + break; + case 0x01: + dev_warn(&device->cdev->dev, + "FORMAT 7 - RCC 1 sequence not " + "successful\n"); + break; + case 0x02: + dev_warn(&device->cdev->dev, + "FORMAT 7 - RCC 1 and RCC 2 sequences not " + "successful\n"); + break; + case 0x03: + dev_warn(&device->cdev->dev, + "FORMAT 7 - Invalid tag-in during " + "selection sequence\n"); + break; + case 0x04: + dev_warn(&device->cdev->dev, + "FORMAT 7 - extra RCC required\n"); + break; + case 0x05: + dev_warn(&device->cdev->dev, + "FORMAT 7 - Invalid DCC selection " + "response or timeout\n"); + break; + case 0x06: + dev_warn(&device->cdev->dev, + "FORMAT 7 - Missing end operation; device " + "transfer complete\n"); + break; + case 0x07: + dev_warn(&device->cdev->dev, + "FORMAT 7 - Missing end operation; device " + "transfer incomplete\n"); + break; + case 0x08: + dev_warn(&device->cdev->dev, + "FORMAT 7 - Invalid tag-in for an " + "immediate command sequence\n"); + break; + case 0x09: + dev_warn(&device->cdev->dev, + "FORMAT 7 - Invalid tag-in for an " + "extended command sequence\n"); + break; + case 0x0A: + dev_warn(&device->cdev->dev, + "FORMAT 7 - 3990 microcode time out when " + "stopping selection\n"); + break; + case 0x0B: + dev_warn(&device->cdev->dev, + "FORMAT 7 - No response to selection " + "after a poll interruption\n"); + break; + case 0x0C: + dev_warn(&device->cdev->dev, + "FORMAT 7 - Permanent path error (DASD " + "controller not available)\n"); + break; + case 0x0D: + dev_warn(&device->cdev->dev, + "FORMAT 7 - DASD controller not available" + " on disconnected command chain\n"); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 7 - Reserved\n"); + } + break; + + case 0x80: /* Format 8 - Additional Device Equipment Checks */ + switch (msg_no) { + case 0x00: /* No Message */ + case 0x01: + dev_warn(&device->cdev->dev, + "FORMAT 8 - Error correction code " + "hardware fault\n"); + break; + case 0x03: + dev_warn(&device->cdev->dev, + "FORMAT 8 - Unexpected end operation " + "response code\n"); + break; + case 0x04: + dev_warn(&device->cdev->dev, + "FORMAT 8 - End operation with transfer " + "count not zero\n"); + break; + case 0x05: + dev_warn(&device->cdev->dev, + "FORMAT 8 - End operation with transfer " + "count zero\n"); + break; + case 0x06: + dev_warn(&device->cdev->dev, + "FORMAT 8 - DPS checks after a system " + "reset or selective reset\n"); + break; + case 0x07: + dev_warn(&device->cdev->dev, + "FORMAT 8 - DPS cannot be filled\n"); + break; + case 0x08: + dev_warn(&device->cdev->dev, + "FORMAT 8 - Short busy time-out during " + "device selection\n"); + break; + case 0x09: + dev_warn(&device->cdev->dev, + "FORMAT 8 - DASD controller failed to " + "set or reset the long busy latch\n"); + break; + case 0x0A: + dev_warn(&device->cdev->dev, + "FORMAT 8 - No interruption from device " + "during a command chain\n"); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 8 - Reserved\n"); + } + break; + + case 0x90: /* Format 9 - Device Read, Write, and Seek Checks */ + switch (msg_no) { + case 0x00: + break; /* No Message */ + case 0x06: + dev_warn(&device->cdev->dev, + "FORMAT 9 - Device check-2 error\n"); + break; + case 0x07: + dev_warn(&device->cdev->dev, + "FORMAT 9 - Head address did not " + "compare\n"); + break; + case 0x0A: + dev_warn(&device->cdev->dev, + "FORMAT 9 - Track physical address did " + "not compare while oriented\n"); + break; + case 0x0E: + dev_warn(&device->cdev->dev, + "FORMAT 9 - Cylinder address did not " + "compare\n"); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT 9 - Reserved\n"); + } + break; + + case 0xF0: /* Format F - Cache Storage Checks */ + switch (msg_no) { + case 0x00: + dev_warn(&device->cdev->dev, + "FORMAT F - Operation Terminated\n"); + break; + case 0x01: + dev_warn(&device->cdev->dev, + "FORMAT F - Subsystem Processing Error\n"); + break; + case 0x02: + dev_warn(&device->cdev->dev, + "FORMAT F - Cache or nonvolatile storage " + "equipment failure\n"); + break; + case 0x04: + dev_warn(&device->cdev->dev, + "FORMAT F - Caching terminated\n"); + break; + case 0x06: + dev_warn(&device->cdev->dev, + "FORMAT F - Cache fast write access not " + "authorized\n"); + break; + case 0x07: + dev_warn(&device->cdev->dev, + "FORMAT F - Track format incorrect\n"); + break; + case 0x09: + dev_warn(&device->cdev->dev, + "FORMAT F - Caching reinitiated\n"); + break; + case 0x0A: + dev_warn(&device->cdev->dev, + "FORMAT F - Nonvolatile storage " + "terminated\n"); + break; + case 0x0B: + dev_warn(&device->cdev->dev, + "FORMAT F - Volume is suspended duplex\n"); + /* call extended error reporting (EER) */ + dasd_eer_write(device, erp->refers, + DASD_EER_PPRCSUSPEND); + break; + case 0x0C: + dev_warn(&device->cdev->dev, + "FORMAT F - Subsystem status cannot be " + "determined\n"); + break; + case 0x0D: + dev_warn(&device->cdev->dev, + "FORMAT F - Caching status reset to " + "default\n"); + break; + case 0x0E: + dev_warn(&device->cdev->dev, + "FORMAT F - DASD Fast Write inhibited\n"); + break; + default: + dev_warn(&device->cdev->dev, + "FORMAT F - Reserved\n"); + } + break; + + default: /* unknown message format - should not happen + internal error 03 - unknown message format */ + snprintf(errorstring, ERRORLENGTH, "03 %x02", msg_format); + dev_err(&device->cdev->dev, + "An error occurred in the DASD device driver, " + "reason=%s\n", errorstring); + break; + } /* end switch message format */ + +} /* end dasd_3990_handle_env_data */ + +/* + * DASD_3990_ERP_COM_REJ + * + * DESCRIPTION + * Handles 24 byte 'Command Reject' error. + * + * PARAMETER + * erp current erp_head + * sense current sense data + * + * RETURN VALUES + * erp 'new' erp_head - pointer to new ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_com_rej(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_device *device = erp->startdev; + + erp->function = dasd_3990_erp_com_rej; + + /* env data present (ACTION 10 - retry should work) */ + if (sense[2] & SNS2_ENV_DATA_PRESENT) { + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Command Reject - environmental data present"); + + dasd_3990_handle_env_data(erp, sense); + + erp->retries = 5; + + } else if (sense[1] & SNS1_WRITE_INHIBITED) { + dev_err(&device->cdev->dev, "An I/O request was rejected" + " because writing is inhibited\n"); + erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); + } else { + /* fatal error - set status to FAILED + internal error 09 - Command Reject */ + if (!test_bit(DASD_CQR_SUPPRESS_CR, &erp->flags)) + dev_err(&device->cdev->dev, + "An error occurred in the DASD device driver, reason=09\n"); + + erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); + } + + return erp; + +} /* end dasd_3990_erp_com_rej */ + +/* + * DASD_3990_ERP_BUS_OUT + * + * DESCRIPTION + * Handles 24 byte 'Bus Out Parity Check' error. + * + * PARAMETER + * erp current erp_head + * RETURN VALUES + * erp new erp_head - pointer to new ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_bus_out(struct dasd_ccw_req * erp) +{ + + struct dasd_device *device = erp->startdev; + + /* first time set initial retry counter and erp_function */ + /* and retry once without blocking queue */ + /* (this enables easier enqueing of the cqr) */ + if (erp->function != dasd_3990_erp_bus_out) { + erp->retries = 256; + erp->function = dasd_3990_erp_bus_out; + + } else { + + /* issue a message and wait for 'device ready' interrupt */ + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "bus out parity error or BOPC requested by " + "channel"); + + dasd_3990_erp_block_queue(erp, 60*HZ); + + } + + return erp; + +} /* end dasd_3990_erp_bus_out */ + +/* + * DASD_3990_ERP_EQUIP_CHECK + * + * DESCRIPTION + * Handles 24 byte 'Equipment Check' error. + * + * PARAMETER + * erp current erp_head + * RETURN VALUES + * erp new erp_head - pointer to new ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_equip_check(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_device *device = erp->startdev; + + erp->function = dasd_3990_erp_equip_check; + + if (sense[1] & SNS1_WRITE_INHIBITED) { + dev_info(&device->cdev->dev, + "Write inhibited path encountered\n"); + + /* vary path offline + internal error 04 - Path should be varied off-line.*/ + dev_err(&device->cdev->dev, "An error occurred in the DASD " + "device driver, reason=%s\n", "04"); + + erp = dasd_3990_erp_action_1(erp); + + } else if (sense[2] & SNS2_ENV_DATA_PRESENT) { + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Equipment Check - " "environmental data present"); + + dasd_3990_handle_env_data(erp, sense); + + erp = dasd_3990_erp_action_4(erp, sense); + + } else if (sense[1] & SNS1_PERM_ERR) { + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Equipment Check - retry exhausted or " + "undesirable"); + + erp = dasd_3990_erp_action_1(erp); + + } else { + /* all other equipment checks - Action 5 */ + /* rest is done when retries == 0 */ + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Equipment check or processing error"); + + erp = dasd_3990_erp_action_5(erp); + } + return erp; + +} /* end dasd_3990_erp_equip_check */ + +/* + * DASD_3990_ERP_DATA_CHECK + * + * DESCRIPTION + * Handles 24 byte 'Data Check' error. + * + * PARAMETER + * erp current erp_head + * RETURN VALUES + * erp new erp_head - pointer to new ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_data_check(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_device *device = erp->startdev; + + erp->function = dasd_3990_erp_data_check; + + if (sense[2] & SNS2_CORRECTABLE) { /* correctable data check */ + + /* issue message that the data has been corrected */ + dev_emerg(&device->cdev->dev, + "Data recovered during retry with PCI " + "fetch mode active\n"); + + /* not possible to handle this situation in Linux */ + panic("No way to inform application about the possibly " + "incorrect data"); + + } else if (sense[2] & SNS2_ENV_DATA_PRESENT) { + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Uncorrectable data check recovered secondary " + "addr of duplex pair"); + + erp = dasd_3990_erp_action_4(erp, sense); + + } else if (sense[1] & SNS1_PERM_ERR) { + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Uncorrectable data check with internal " + "retry exhausted"); + + erp = dasd_3990_erp_action_1(erp); + + } else { + /* all other data checks */ + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Uncorrectable data check with retry count " + "exhausted..."); + + erp = dasd_3990_erp_action_5(erp); + } + + return erp; + +} /* end dasd_3990_erp_data_check */ + +/* + * DASD_3990_ERP_OVERRUN + * + * DESCRIPTION + * Handles 24 byte 'Overrun' error. + * + * PARAMETER + * erp current erp_head + * RETURN VALUES + * erp new erp_head - pointer to new ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_overrun(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_device *device = erp->startdev; + + erp->function = dasd_3990_erp_overrun; + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Overrun - service overrun or overrun" + " error requested by channel"); + + erp = dasd_3990_erp_action_5(erp); + + return erp; + +} /* end dasd_3990_erp_overrun */ + +/* + * DASD_3990_ERP_INV_FORMAT + * + * DESCRIPTION + * Handles 24 byte 'Invalid Track Format' error. + * + * PARAMETER + * erp current erp_head + * RETURN VALUES + * erp new erp_head - pointer to new ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_inv_format(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_device *device = erp->startdev; + + erp->function = dasd_3990_erp_inv_format; + + if (sense[2] & SNS2_ENV_DATA_PRESENT) { + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Track format error when destaging or " + "staging data"); + + dasd_3990_handle_env_data(erp, sense); + + erp = dasd_3990_erp_action_4(erp, sense); + + } else { + /* internal error 06 - The track format is not valid*/ + dev_err(&device->cdev->dev, + "An error occurred in the DASD device driver, " + "reason=%s\n", "06"); + + erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); + } + + return erp; + +} /* end dasd_3990_erp_inv_format */ + +/* + * DASD_3990_ERP_EOC + * + * DESCRIPTION + * Handles 24 byte 'End-of-Cylinder' error. + * + * PARAMETER + * erp already added default erp + * RETURN VALUES + * erp pointer to original (failed) cqr. + */ +static struct dasd_ccw_req * +dasd_3990_erp_EOC(struct dasd_ccw_req * default_erp, char *sense) +{ + + struct dasd_device *device = default_erp->startdev; + + dev_err(&device->cdev->dev, + "The cylinder data for accessing the DASD is inconsistent\n"); + + /* implement action 7 - BUG */ + return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED); + +} /* end dasd_3990_erp_EOC */ + +/* + * DASD_3990_ERP_ENV_DATA + * + * DESCRIPTION + * Handles 24 byte 'Environmental-Data Present' error. + * + * PARAMETER + * erp current erp_head + * RETURN VALUES + * erp new erp_head - pointer to new ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_env_data(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_device *device = erp->startdev; + + erp->function = dasd_3990_erp_env_data; + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Environmental data present"); + + dasd_3990_handle_env_data(erp, sense); + + /* don't retry on disabled interface */ + if (sense[7] != 0x0F) { + erp = dasd_3990_erp_action_4(erp, sense); + } else { + erp->status = DASD_CQR_FILLED; + } + + return erp; + +} /* end dasd_3990_erp_env_data */ + +/* + * DASD_3990_ERP_NO_REC + * + * DESCRIPTION + * Handles 24 byte 'No Record Found' error. + * + * PARAMETER + * erp already added default ERP + * + * RETURN VALUES + * erp new erp_head - pointer to new ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_no_rec(struct dasd_ccw_req * default_erp, char *sense) +{ + + struct dasd_device *device = default_erp->startdev; + + /* + * In some cases the 'No Record Found' error might be expected and + * log messages shouldn't be written then. + * Check if the according suppress bit is set. + */ + if (!test_bit(DASD_CQR_SUPPRESS_NRF, &default_erp->flags)) + dev_err(&device->cdev->dev, + "The specified record was not found\n"); + + return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED); + +} /* end dasd_3990_erp_no_rec */ + +/* + * DASD_3990_ERP_FILE_PROT + * + * DESCRIPTION + * Handles 24 byte 'File Protected' error. + * Note: Seek related recovery is not implemented because + * wee don't use the seek command yet. + * + * PARAMETER + * erp current erp_head + * RETURN VALUES + * erp new erp_head - pointer to new ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_file_prot(struct dasd_ccw_req * erp) +{ + + struct dasd_device *device = erp->startdev; + + /* + * In some cases the 'File Protected' error might be expected and + * log messages shouldn't be written then. + * Check if the according suppress bit is set. + */ + if (!test_bit(DASD_CQR_SUPPRESS_FP, &erp->flags)) + dev_err(&device->cdev->dev, + "Accessing the DASD failed because of a hardware error\n"); + + return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); + +} /* end dasd_3990_erp_file_prot */ + +/* + * DASD_3990_ERP_INSPECT_ALIAS + * + * DESCRIPTION + * Checks if the original request was started on an alias device. + * If yes, it modifies the original and the erp request so that + * the erp request can be started on a base device. + * + * PARAMETER + * erp pointer to the currently created default ERP + * + * RETURN VALUES + * erp pointer to the modified ERP, or NULL + */ + +static struct dasd_ccw_req *dasd_3990_erp_inspect_alias( + struct dasd_ccw_req *erp) +{ + struct dasd_ccw_req *cqr = erp->refers; + char *sense; + + if (cqr->block && + (cqr->block->base != cqr->startdev)) { + + sense = dasd_get_sense(&erp->refers->irb); + /* + * dynamic pav may have changed base alias mapping + */ + if (!test_bit(DASD_FLAG_OFFLINE, &cqr->startdev->flags) && sense + && (sense[0] == 0x10) && (sense[7] == 0x0F) + && (sense[8] == 0x67)) { + /* + * remove device from alias handling to prevent new + * requests from being scheduled on the + * wrong alias device + */ + dasd_alias_remove_device(cqr->startdev); + + /* schedule worker to reload device */ + dasd_reload_device(cqr->startdev); + } + + if (cqr->startdev->features & DASD_FEATURE_ERPLOG) { + DBF_DEV_EVENT(DBF_ERR, cqr->startdev, + "ERP on alias device for request %p," + " recover on base device %s", cqr, + dev_name(&cqr->block->base->cdev->dev)); + } + dasd_eckd_reset_ccw_to_base_io(cqr); + erp->startdev = cqr->block->base; + erp->function = dasd_3990_erp_inspect_alias; + return erp; + } else + return NULL; +} + + +/* + * DASD_3990_ERP_INSPECT_24 + * + * DESCRIPTION + * Does a detailed inspection of the 24 byte sense data + * and sets up a related error recovery action. + * + * PARAMETER + * sense sense data of the actual error + * erp pointer to the currently created default ERP + * + * RETURN VALUES + * erp pointer to the (addtitional) ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_inspect_24(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_ccw_req *erp_filled = NULL; + + /* Check sense for .... */ + /* 'Command Reject' */ + if ((erp_filled == NULL) && (sense[0] & SNS0_CMD_REJECT)) { + erp_filled = dasd_3990_erp_com_rej(erp, sense); + } + /* 'Intervention Required' */ + if ((erp_filled == NULL) && (sense[0] & SNS0_INTERVENTION_REQ)) { + erp_filled = dasd_3990_erp_int_req(erp); + } + /* 'Bus Out Parity Check' */ + if ((erp_filled == NULL) && (sense[0] & SNS0_BUS_OUT_CHECK)) { + erp_filled = dasd_3990_erp_bus_out(erp); + } + /* 'Equipment Check' */ + if ((erp_filled == NULL) && (sense[0] & SNS0_EQUIPMENT_CHECK)) { + erp_filled = dasd_3990_erp_equip_check(erp, sense); + } + /* 'Data Check' */ + if ((erp_filled == NULL) && (sense[0] & SNS0_DATA_CHECK)) { + erp_filled = dasd_3990_erp_data_check(erp, sense); + } + /* 'Overrun' */ + if ((erp_filled == NULL) && (sense[0] & SNS0_OVERRUN)) { + erp_filled = dasd_3990_erp_overrun(erp, sense); + } + /* 'Invalid Track Format' */ + if ((erp_filled == NULL) && (sense[1] & SNS1_INV_TRACK_FORMAT)) { + erp_filled = dasd_3990_erp_inv_format(erp, sense); + } + /* 'End-of-Cylinder' */ + if ((erp_filled == NULL) && (sense[1] & SNS1_EOC)) { + erp_filled = dasd_3990_erp_EOC(erp, sense); + } + /* 'Environmental Data' */ + if ((erp_filled == NULL) && (sense[2] & SNS2_ENV_DATA_PRESENT)) { + erp_filled = dasd_3990_erp_env_data(erp, sense); + } + /* 'No Record Found' */ + if ((erp_filled == NULL) && (sense[1] & SNS1_NO_REC_FOUND)) { + erp_filled = dasd_3990_erp_no_rec(erp, sense); + } + /* 'File Protected' */ + if ((erp_filled == NULL) && (sense[1] & SNS1_FILE_PROTECTED)) { + erp_filled = dasd_3990_erp_file_prot(erp); + } + /* other (unknown) error - do default ERP */ + if (erp_filled == NULL) { + + erp_filled = erp; + } + + return erp_filled; + +} /* END dasd_3990_erp_inspect_24 */ + +/* + ***************************************************************************** + * 32 byte sense ERP functions (only) + ***************************************************************************** + */ + +/* + * DASD_3990_ERPACTION_10_32 + * + * DESCRIPTION + * Handles 32 byte 'Action 10' of Single Program Action Codes. + * Just retry and if retry doesn't work, return with error. + * + * PARAMETER + * erp current erp_head + * sense current sense data + * RETURN VALUES + * erp modified erp_head + */ +static struct dasd_ccw_req * +dasd_3990_erp_action_10_32(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_device *device = erp->startdev; + + erp->retries = 256; + erp->function = dasd_3990_erp_action_10_32; + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Perform logging requested"); + + return erp; + +} /* end dasd_3990_erp_action_10_32 */ + +/* + * DASD_3990_ERP_ACTION_1B_32 + * + * DESCRIPTION + * Handles 32 byte 'Action 1B' of Single Program Action Codes. + * A write operation could not be finished because of an unexpected + * condition. + * The already created 'default erp' is used to get the link to + * the erp chain, but it can not be used for this recovery + * action because it contains no DE/LO data space. + * + * PARAMETER + * default_erp already added default erp. + * sense current sense data + * + * RETURN VALUES + * erp new erp or + * default_erp in case of imprecise ending or error + */ +static struct dasd_ccw_req * +dasd_3990_erp_action_1B_32(struct dasd_ccw_req * default_erp, char *sense) +{ + + struct dasd_device *device = default_erp->startdev; + __u32 cpa = 0; + struct dasd_ccw_req *cqr; + struct dasd_ccw_req *erp; + struct DE_eckd_data *DE_data; + struct PFX_eckd_data *PFX_data; + char *LO_data; /* LO_eckd_data_t */ + struct ccw1 *ccw, *oldccw; + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Write not finished because of unexpected condition"); + + default_erp->function = dasd_3990_erp_action_1B_32; + + /* determine the original cqr */ + cqr = default_erp; + + while (cqr->refers != NULL) { + cqr = cqr->refers; + } + + if (scsw_is_tm(&cqr->irb.scsw)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "32 bit sense, action 1B is not defined" + " in transport mode - just retry"); + return default_erp; + } + + /* for imprecise ending just do default erp */ + if (sense[1] & 0x01) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Imprecise ending is set - just retry"); + + return default_erp; + } + + /* determine the address of the CCW to be restarted */ + /* Imprecise ending is not set -> addr from IRB-SCSW */ + cpa = default_erp->refers->irb.scsw.cmd.cpa; + + if (cpa == 0) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Unable to determine address of the CCW " + "to be restarted"); + + return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED); + } + + /* Build new ERP request including DE/LO */ + erp = dasd_alloc_erp_request((char *) &cqr->magic, + 2 + 1,/* DE/LO + TIC */ + sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data), device); + + if (IS_ERR(erp)) { + /* internal error 01 - Unable to allocate ERP */ + dev_err(&device->cdev->dev, "An error occurred in the DASD " + "device driver, reason=%s\n", "01"); + return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED); + } + + /* use original DE */ + DE_data = erp->data; + oldccw = cqr->cpaddr; + if (oldccw->cmd_code == DASD_ECKD_CCW_PFX) { + PFX_data = cqr->data; + memcpy(DE_data, &PFX_data->define_extent, + sizeof(struct DE_eckd_data)); + } else + memcpy(DE_data, cqr->data, sizeof(struct DE_eckd_data)); + + /* create LO */ + LO_data = erp->data + sizeof(struct DE_eckd_data); + + if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) { + /* should not */ + return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED); + } + + if ((sense[7] & 0x3F) == 0x01) { + /* operation code is WRITE DATA -> data area orientation */ + LO_data[0] = 0x81; + + } else if ((sense[7] & 0x3F) == 0x03) { + /* operation code is FORMAT WRITE -> index orientation */ + LO_data[0] = 0xC3; + + } else { + LO_data[0] = sense[7]; /* operation */ + } + + LO_data[1] = sense[8]; /* auxiliary */ + LO_data[2] = sense[9]; + LO_data[3] = sense[3]; /* count */ + LO_data[4] = sense[29]; /* seek_addr.cyl */ + LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */ + LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */ + + memcpy(&(LO_data[8]), &(sense[11]), 8); + + /* create DE ccw */ + ccw = erp->cpaddr; + memset(ccw, 0, sizeof(struct ccw1)); + ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT; + ccw->flags = CCW_FLAG_CC; + ccw->count = 16; + ccw->cda = (__u32)(addr_t) DE_data; + + /* create LO ccw */ + ccw++; + memset(ccw, 0, sizeof(struct ccw1)); + ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD; + ccw->flags = CCW_FLAG_CC; + ccw->count = 16; + ccw->cda = (__u32)(addr_t) LO_data; + + /* TIC to the failed ccw */ + ccw++; + ccw->cmd_code = CCW_CMD_TIC; + ccw->cda = cpa; + + /* fill erp related fields */ + erp->flags = default_erp->flags; + erp->function = dasd_3990_erp_action_1B_32; + erp->refers = default_erp->refers; + erp->startdev = device; + erp->memdev = device; + erp->magic = default_erp->magic; + erp->expires = default_erp->expires; + erp->retries = 256; + erp->buildclk = get_tod_clock(); + erp->status = DASD_CQR_FILLED; + + /* remove the default erp */ + dasd_free_erp_request(default_erp, device); + + return erp; + +} /* end dasd_3990_erp_action_1B_32 */ + +/* + * DASD_3990_UPDATE_1B + * + * DESCRIPTION + * Handles the update to the 32 byte 'Action 1B' of Single Program + * Action Codes in case the first action was not successful. + * The already created 'previous_erp' is the currently not successful + * ERP. + * + * PARAMETER + * previous_erp already created previous erp. + * sense current sense data + * RETURN VALUES + * erp modified erp + */ +static struct dasd_ccw_req * +dasd_3990_update_1B(struct dasd_ccw_req * previous_erp, char *sense) +{ + + struct dasd_device *device = previous_erp->startdev; + __u32 cpa = 0; + struct dasd_ccw_req *cqr; + struct dasd_ccw_req *erp; + char *LO_data; /* struct LO_eckd_data */ + struct ccw1 *ccw; + + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Write not finished because of unexpected condition" + " - follow on"); + + /* determine the original cqr */ + cqr = previous_erp; + + while (cqr->refers != NULL) { + cqr = cqr->refers; + } + + if (scsw_is_tm(&cqr->irb.scsw)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "32 bit sense, action 1B, update," + " in transport mode - just retry"); + return previous_erp; + } + + /* for imprecise ending just do default erp */ + if (sense[1] & 0x01) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Imprecise ending is set - just retry"); + + previous_erp->status = DASD_CQR_FILLED; + + return previous_erp; + } + + /* determine the address of the CCW to be restarted */ + /* Imprecise ending is not set -> addr from IRB-SCSW */ + cpa = previous_erp->irb.scsw.cmd.cpa; + + if (cpa == 0) { + /* internal error 02 - + Unable to determine address of the CCW to be restarted */ + dev_err(&device->cdev->dev, "An error occurred in the DASD " + "device driver, reason=%s\n", "02"); + + previous_erp->status = DASD_CQR_FAILED; + + return previous_erp; + } + + erp = previous_erp; + + /* update the LO with the new returned sense data */ + LO_data = erp->data + sizeof(struct DE_eckd_data); + + if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) { + /* should not happen */ + previous_erp->status = DASD_CQR_FAILED; + + return previous_erp; + } + + if ((sense[7] & 0x3F) == 0x01) { + /* operation code is WRITE DATA -> data area orientation */ + LO_data[0] = 0x81; + + } else if ((sense[7] & 0x3F) == 0x03) { + /* operation code is FORMAT WRITE -> index orientation */ + LO_data[0] = 0xC3; + + } else { + LO_data[0] = sense[7]; /* operation */ + } + + LO_data[1] = sense[8]; /* auxiliary */ + LO_data[2] = sense[9]; + LO_data[3] = sense[3]; /* count */ + LO_data[4] = sense[29]; /* seek_addr.cyl */ + LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */ + LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */ + + memcpy(&(LO_data[8]), &(sense[11]), 8); + + /* TIC to the failed ccw */ + ccw = erp->cpaddr; /* addr of DE ccw */ + ccw++; /* addr of LE ccw */ + ccw++; /* addr of TIC ccw */ + ccw->cda = cpa; + + erp->status = DASD_CQR_FILLED; + + return erp; + +} /* end dasd_3990_update_1B */ + +/* + * DASD_3990_ERP_COMPOUND_RETRY + * + * DESCRIPTION + * Handles the compound ERP action retry code. + * NOTE: At least one retry is done even if zero is specified + * by the sense data. This makes enqueueing of the request + * easier. + * + * PARAMETER + * sense sense data of the actual error + * erp pointer to the currently created ERP + * + * RETURN VALUES + * erp modified ERP pointer + * + */ +static void +dasd_3990_erp_compound_retry(struct dasd_ccw_req * erp, char *sense) +{ + + switch (sense[25] & 0x03) { + case 0x00: /* no not retry */ + erp->retries = 1; + break; + + case 0x01: /* retry 2 times */ + erp->retries = 2; + break; + + case 0x02: /* retry 10 times */ + erp->retries = 10; + break; + + case 0x03: /* retry 256 times */ + erp->retries = 256; + break; + + default: + BUG(); + } + + erp->function = dasd_3990_erp_compound_retry; + +} /* end dasd_3990_erp_compound_retry */ + +/* + * DASD_3990_ERP_COMPOUND_PATH + * + * DESCRIPTION + * Handles the compound ERP action for retry on alternate + * channel path. + * + * PARAMETER + * sense sense data of the actual error + * erp pointer to the currently created ERP + * + * RETURN VALUES + * erp modified ERP pointer + * + */ +static void +dasd_3990_erp_compound_path(struct dasd_ccw_req * erp, char *sense) +{ + if (sense[25] & DASD_SENSE_BIT_3) { + dasd_3990_erp_alternate_path(erp); + + if (erp->status == DASD_CQR_FAILED && + !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) { + /* reset the lpm and the status to be able to + * try further actions. */ + erp->lpm = dasd_path_get_opm(erp->startdev); + erp->status = DASD_CQR_NEED_ERP; + } + } + + erp->function = dasd_3990_erp_compound_path; + +} /* end dasd_3990_erp_compound_path */ + +/* + * DASD_3990_ERP_COMPOUND_CODE + * + * DESCRIPTION + * Handles the compound ERP action for retry code. + * + * PARAMETER + * sense sense data of the actual error + * erp pointer to the currently created ERP + * + * RETURN VALUES + * erp NEW ERP pointer + * + */ +static struct dasd_ccw_req * +dasd_3990_erp_compound_code(struct dasd_ccw_req * erp, char *sense) +{ + + if (sense[25] & DASD_SENSE_BIT_2) { + + switch (sense[28]) { + case 0x17: + /* issue a Diagnostic Control command with an + * Inhibit Write subcommand and controller modifier */ + erp = dasd_3990_erp_DCTL(erp, 0x20); + break; + + case 0x25: + /* wait for 5 seconds and retry again */ + erp->retries = 1; + + dasd_3990_erp_block_queue (erp, 5*HZ); + break; + + default: + /* should not happen - continue */ + break; + } + } + + erp->function = dasd_3990_erp_compound_code; + + return erp; + +} /* end dasd_3990_erp_compound_code */ + +/* + * DASD_3990_ERP_COMPOUND_CONFIG + * + * DESCRIPTION + * Handles the compound ERP action for configruation + * dependent error. + * Note: duplex handling is not implemented (yet). + * + * PARAMETER + * sense sense data of the actual error + * erp pointer to the currently created ERP + * + * RETURN VALUES + * erp modified ERP pointer + * + */ +static void +dasd_3990_erp_compound_config(struct dasd_ccw_req * erp, char *sense) +{ + + if ((sense[25] & DASD_SENSE_BIT_1) && (sense[26] & DASD_SENSE_BIT_2)) { + + /* set to suspended duplex state then restart + internal error 05 - Set device to suspended duplex state + should be done */ + struct dasd_device *device = erp->startdev; + dev_err(&device->cdev->dev, + "An error occurred in the DASD device driver, " + "reason=%s\n", "05"); + + } + + erp->function = dasd_3990_erp_compound_config; + +} /* end dasd_3990_erp_compound_config */ + +/* + * DASD_3990_ERP_COMPOUND + * + * DESCRIPTION + * Does the further compound program action if + * compound retry was not successful. + * + * PARAMETER + * sense sense data of the actual error + * erp pointer to the current (failed) ERP + * + * RETURN VALUES + * erp (additional) ERP pointer + * + */ +static struct dasd_ccw_req * +dasd_3990_erp_compound(struct dasd_ccw_req * erp, char *sense) +{ + + if ((erp->function == dasd_3990_erp_compound_retry) && + (erp->status == DASD_CQR_NEED_ERP)) { + + dasd_3990_erp_compound_path(erp, sense); + } + + if ((erp->function == dasd_3990_erp_compound_path) && + (erp->status == DASD_CQR_NEED_ERP)) { + + erp = dasd_3990_erp_compound_code(erp, sense); + } + + if ((erp->function == dasd_3990_erp_compound_code) && + (erp->status == DASD_CQR_NEED_ERP)) { + + dasd_3990_erp_compound_config(erp, sense); + } + + /* if no compound action ERP specified, the request failed */ + if (erp->status == DASD_CQR_NEED_ERP) + erp->status = DASD_CQR_FAILED; + + return erp; + +} /* end dasd_3990_erp_compound */ + +/* + *DASD_3990_ERP_HANDLE_SIM + * + *DESCRIPTION + * inspects the SIM SENSE data and starts an appropriate action + * + * PARAMETER + * sense sense data of the actual error + * + * RETURN VALUES + * none + */ +void +dasd_3990_erp_handle_sim(struct dasd_device *device, char *sense) +{ + /* print message according to log or message to operator mode */ + if ((sense[24] & DASD_SIM_MSG_TO_OP) || (sense[1] & 0x10)) { + /* print SIM SRC from RefCode */ + dev_err(&device->cdev->dev, "SIM - SRC: " + "%02x%02x%02x%02x\n", sense[22], + sense[23], sense[11], sense[12]); + } else if (sense[24] & DASD_SIM_LOG) { + /* print SIM SRC Refcode */ + dev_warn(&device->cdev->dev, "log SIM - SRC: " + "%02x%02x%02x%02x\n", sense[22], + sense[23], sense[11], sense[12]); + } +} + +/* + * DASD_3990_ERP_INSPECT_32 + * + * DESCRIPTION + * Does a detailed inspection of the 32 byte sense data + * and sets up a related error recovery action. + * + * PARAMETER + * sense sense data of the actual error + * erp pointer to the currently created default ERP + * + * RETURN VALUES + * erp_filled pointer to the ERP + * + */ +static struct dasd_ccw_req * +dasd_3990_erp_inspect_32(struct dasd_ccw_req * erp, char *sense) +{ + + struct dasd_device *device = erp->startdev; + + erp->function = dasd_3990_erp_inspect_32; + + /* check for SIM sense data */ + if ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE) + dasd_3990_erp_handle_sim(device, sense); + + if (sense[25] & DASD_SENSE_BIT_0) { + + /* compound program action codes (byte25 bit 0 == '1') */ + dasd_3990_erp_compound_retry(erp, sense); + + } else { + + /* single program action codes (byte25 bit 0 == '0') */ + switch (sense[25]) { + + case 0x00: /* success - use default ERP for retries */ + DBF_DEV_EVENT(DBF_DEBUG, device, "%s", + "ERP called for successful request" + " - just retry"); + break; + + case 0x01: /* fatal error */ + dev_err(&device->cdev->dev, + "ERP failed for the DASD\n"); + + erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); + break; + + case 0x02: /* intervention required */ + case 0x03: /* intervention required during dual copy */ + erp = dasd_3990_erp_int_req(erp); + break; + + case 0x0F: /* length mismatch during update write command + internal error 08 - update write command error*/ + dev_err(&device->cdev->dev, "An error occurred in the " + "DASD device driver, reason=%s\n", "08"); + + erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); + break; + + case 0x10: /* logging required for other channel program */ + erp = dasd_3990_erp_action_10_32(erp, sense); + break; + + case 0x15: /* next track outside defined extend + internal error 07 - The next track is not + within the defined storage extent */ + dev_err(&device->cdev->dev, + "An error occurred in the DASD device driver, " + "reason=%s\n", "07"); + + erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); + break; + + case 0x1B: /* unexpected condition during write */ + + erp = dasd_3990_erp_action_1B_32(erp, sense); + break; + + case 0x1C: /* invalid data */ + dev_emerg(&device->cdev->dev, + "Data recovered during retry with PCI " + "fetch mode active\n"); + + /* not possible to handle this situation in Linux */ + panic + ("Invalid data - No way to inform application " + "about the possibly incorrect data"); + break; + + case 0x1D: /* state-change pending */ + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "A State change pending condition exists " + "for the subsystem or device"); + + erp = dasd_3990_erp_action_4(erp, sense); + break; + + case 0x1E: /* busy */ + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Busy condition exists " + "for the subsystem or device"); + erp = dasd_3990_erp_action_4(erp, sense); + break; + + default: /* all others errors - default erp */ + break; + } + } + + return erp; + +} /* end dasd_3990_erp_inspect_32 */ + +static void dasd_3990_erp_disable_path(struct dasd_device *device, __u8 lpum) +{ + int pos = pathmask_to_pos(lpum); + + if (!(device->features & DASD_FEATURE_PATH_AUTODISABLE)) { + dev_err(&device->cdev->dev, + "Path %x.%02x (pathmask %02x) is operational despite excessive IFCCs\n", + device->path[pos].cssid, device->path[pos].chpid, lpum); + goto out; + } + + /* no remaining path, cannot disable */ + if (!(dasd_path_get_opm(device) & ~lpum)) { + dev_err(&device->cdev->dev, + "Last path %x.%02x (pathmask %02x) is operational despite excessive IFCCs\n", + device->path[pos].cssid, device->path[pos].chpid, lpum); + goto out; + } + + dev_err(&device->cdev->dev, + "Path %x.%02x (pathmask %02x) is disabled - IFCC threshold exceeded\n", + device->path[pos].cssid, device->path[pos].chpid, lpum); + dasd_path_remove_opm(device, lpum); + dasd_path_add_ifccpm(device, lpum); + +out: + device->path[pos].errorclk = 0; + atomic_set(&device->path[pos].error_count, 0); +} + +static void dasd_3990_erp_account_error(struct dasd_ccw_req *erp) +{ + struct dasd_device *device = erp->startdev; + __u8 lpum = erp->refers->irb.esw.esw1.lpum; + int pos = pathmask_to_pos(lpum); + unsigned long clk; + + if (!device->path_thrhld) + return; + + clk = get_tod_clock(); + /* + * check if the last error is longer ago than the timeout, + * if so reset error state + */ + if ((tod_to_ns(clk - device->path[pos].errorclk) / NSEC_PER_SEC) + >= device->path_interval) { + atomic_set(&device->path[pos].error_count, 0); + device->path[pos].errorclk = 0; + } + atomic_inc(&device->path[pos].error_count); + device->path[pos].errorclk = clk; + /* threshold exceeded disable path if possible */ + if (atomic_read(&device->path[pos].error_count) >= + device->path_thrhld) + dasd_3990_erp_disable_path(device, lpum); +} + +/* + ***************************************************************************** + * main ERP control functions (24 and 32 byte sense) + ***************************************************************************** + */ + +/* + * DASD_3990_ERP_CONTROL_CHECK + * + * DESCRIPTION + * Does a generic inspection if a control check occurred and sets up + * the related error recovery procedure + * + * PARAMETER + * erp pointer to the currently created default ERP + * + * RETURN VALUES + * erp_filled pointer to the erp + */ + +static struct dasd_ccw_req * +dasd_3990_erp_control_check(struct dasd_ccw_req *erp) +{ + struct dasd_device *device = erp->startdev; + + if (scsw_cstat(&erp->refers->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK + | SCHN_STAT_CHN_CTRL_CHK)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "channel or interface control check"); + dasd_3990_erp_account_error(erp); + erp = dasd_3990_erp_action_4(erp, NULL); + } + return erp; +} + +/* + * DASD_3990_ERP_INSPECT + * + * DESCRIPTION + * Does a detailed inspection for sense data by calling either + * the 24-byte or the 32-byte inspection routine. + * + * PARAMETER + * erp pointer to the currently created default ERP + * RETURN VALUES + * erp_new contens was possibly modified + */ +static struct dasd_ccw_req * +dasd_3990_erp_inspect(struct dasd_ccw_req *erp) +{ + + struct dasd_ccw_req *erp_new = NULL; + char *sense; + + /* if this problem occurred on an alias retry on base */ + erp_new = dasd_3990_erp_inspect_alias(erp); + if (erp_new) + return erp_new; + + /* sense data are located in the refers record of the + * already set up new ERP ! + * check if concurrent sens is available + */ + sense = dasd_get_sense(&erp->refers->irb); + if (!sense) + erp_new = dasd_3990_erp_control_check(erp); + /* distinguish between 24 and 32 byte sense data */ + else if (sense[27] & DASD_SENSE_BIT_0) { + + /* inspect the 24 byte sense data */ + erp_new = dasd_3990_erp_inspect_24(erp, sense); + + } else { + + /* inspect the 32 byte sense data */ + erp_new = dasd_3990_erp_inspect_32(erp, sense); + + } /* end distinguish between 24 and 32 byte sense data */ + + return erp_new; +} + +/* + * DASD_3990_ERP_ADD_ERP + * + * DESCRIPTION + * This function adds an additional request block (ERP) to the head of + * the given cqr (or erp). + * For a command mode cqr the erp is initialized as an default erp + * (retry TIC). + * For transport mode we make a copy of the original TCW (points to + * the original TCCB, TIDALs, etc.) but give it a fresh + * TSB so the original sense data will not be changed. + * + * PARAMETER + * cqr head of the current ERP-chain (or single cqr if + * first error) + * RETURN VALUES + * erp pointer to new ERP-chain head + */ +static struct dasd_ccw_req *dasd_3990_erp_add_erp(struct dasd_ccw_req *cqr) +{ + + struct dasd_device *device = cqr->startdev; + struct ccw1 *ccw; + struct dasd_ccw_req *erp; + int cplength, datasize; + struct tcw *tcw; + struct tsb *tsb; + + if (cqr->cpmode == 1) { + cplength = 0; + /* TCW needs to be 64 byte aligned, so leave enough room */ + datasize = 64 + sizeof(struct tcw) + sizeof(struct tsb); + } else { + cplength = 2; + datasize = 0; + } + + /* allocate additional request block */ + erp = dasd_alloc_erp_request((char *) &cqr->magic, + cplength, datasize, device); + if (IS_ERR(erp)) { + if (cqr->retries <= 0) { + DBF_DEV_EVENT(DBF_ERR, device, "%s", + "Unable to allocate ERP request"); + cqr->status = DASD_CQR_FAILED; + cqr->stopclk = get_tod_clock(); + } else { + DBF_DEV_EVENT(DBF_ERR, device, + "Unable to allocate ERP request " + "(%i retries left)", + cqr->retries); + dasd_block_set_timer(device->block, (HZ << 3)); + } + return erp; + } + + ccw = cqr->cpaddr; + if (cqr->cpmode == 1) { + /* make a shallow copy of the original tcw but set new tsb */ + erp->cpmode = 1; + erp->cpaddr = PTR_ALIGN(erp->data, 64); + tcw = erp->cpaddr; + tsb = (struct tsb *) &tcw[1]; + *tcw = *((struct tcw *)cqr->cpaddr); + tcw->tsb = (long)tsb; + } else if (ccw->cmd_code == DASD_ECKD_CCW_PSF) { + /* PSF cannot be chained from NOOP/TIC */ + erp->cpaddr = cqr->cpaddr; + } else { + /* initialize request with default TIC to current ERP/CQR */ + ccw = erp->cpaddr; + ccw->cmd_code = CCW_CMD_NOOP; + ccw->flags = CCW_FLAG_CC; + ccw++; + ccw->cmd_code = CCW_CMD_TIC; + ccw->cda = (long)(cqr->cpaddr); + } + + erp->flags = cqr->flags; + erp->function = dasd_3990_erp_add_erp; + erp->refers = cqr; + erp->startdev = device; + erp->memdev = device; + erp->block = cqr->block; + erp->magic = cqr->magic; + erp->expires = cqr->expires; + erp->retries = 256; + erp->buildclk = get_tod_clock(); + erp->status = DASD_CQR_FILLED; + + return erp; +} + +/* + * DASD_3990_ERP_ADDITIONAL_ERP + * + * DESCRIPTION + * An additional ERP is needed to handle the current error. + * Add ERP to the head of the ERP-chain containing the ERP processing + * determined based on the sense data. + * + * PARAMETER + * cqr head of the current ERP-chain (or single cqr if + * first error) + * + * RETURN VALUES + * erp pointer to new ERP-chain head + */ +static struct dasd_ccw_req * +dasd_3990_erp_additional_erp(struct dasd_ccw_req * cqr) +{ + + struct dasd_ccw_req *erp = NULL; + + /* add erp and initialize with default TIC */ + erp = dasd_3990_erp_add_erp(cqr); + + if (IS_ERR(erp)) + return erp; + + /* inspect sense, determine specific ERP if possible */ + if (erp != cqr) { + + erp = dasd_3990_erp_inspect(erp); + } + + return erp; + +} /* end dasd_3990_erp_additional_erp */ + +/* + * DASD_3990_ERP_ERROR_MATCH + * + * DESCRIPTION + * Check if the device status of the given cqr is the same. + * This means that the failed CCW and the relevant sense data + * must match. + * I don't distinguish between 24 and 32 byte sense because in case of + * 24 byte sense byte 25 and 27 is set as well. + * + * PARAMETER + * cqr1 first cqr, which will be compared with the + * cqr2 second cqr. + * + * RETURN VALUES + * match 'boolean' for match found + * returns 1 if match found, otherwise 0. + */ +static int dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1, + struct dasd_ccw_req *cqr2) +{ + char *sense1, *sense2; + + if (cqr1->startdev != cqr2->startdev) + return 0; + + sense1 = dasd_get_sense(&cqr1->irb); + sense2 = dasd_get_sense(&cqr2->irb); + + /* one request has sense data, the other not -> no match, return 0 */ + if (!sense1 != !sense2) + return 0; + /* no sense data in both cases -> check cstat for IFCC */ + if (!sense1 && !sense2) { + if ((scsw_cstat(&cqr1->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK | + SCHN_STAT_CHN_CTRL_CHK)) == + (scsw_cstat(&cqr2->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK | + SCHN_STAT_CHN_CTRL_CHK))) + return 1; /* match with ifcc*/ + } + /* check sense data; byte 0-2,25,27 */ + if (!(sense1 && sense2 && + (memcmp(sense1, sense2, 3) == 0) && + (sense1[27] == sense2[27]) && + (sense1[25] == sense2[25]))) { + + return 0; /* sense doesn't match */ + } + + return 1; /* match */ + +} /* end dasd_3990_erp_error_match */ + +/* + * DASD_3990_ERP_IN_ERP + * + * DESCRIPTION + * check if the current error already happened before. + * quick exit if current cqr is not an ERP (cqr->refers=NULL) + * + * PARAMETER + * cqr failed cqr (either original cqr or already an erp) + * + * RETURN VALUES + * erp erp-pointer to the already defined error + * recovery procedure OR + * NULL if a 'new' error occurred. + */ +static struct dasd_ccw_req * +dasd_3990_erp_in_erp(struct dasd_ccw_req *cqr) +{ + + struct dasd_ccw_req *erp_head = cqr, /* save erp chain head */ + *erp_match = NULL; /* save erp chain head */ + int match = 0; /* 'boolean' for matching error found */ + + if (cqr->refers == NULL) { /* return if not in erp */ + return NULL; + } + + /* check the erp/cqr chain for current error */ + do { + match = dasd_3990_erp_error_match(erp_head, cqr->refers); + erp_match = cqr; /* save possible matching erp */ + cqr = cqr->refers; /* check next erp/cqr in queue */ + + } while ((cqr->refers != NULL) && (!match)); + + if (!match) { + return NULL; /* no match was found */ + } + + return erp_match; /* return address of matching erp */ + +} /* END dasd_3990_erp_in_erp */ + +/* + * DASD_3990_ERP_FURTHER_ERP (24 & 32 byte sense) + * + * DESCRIPTION + * No retry is left for the current ERP. Check what has to be done + * with the ERP. + * - do further defined ERP action or + * - wait for interrupt or + * - exit with permanent error + * + * PARAMETER + * erp ERP which is in progress with no retry left + * + * RETURN VALUES + * erp modified/additional ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_further_erp(struct dasd_ccw_req *erp) +{ + + struct dasd_device *device = erp->startdev; + char *sense = dasd_get_sense(&erp->irb); + + /* check for 24 byte sense ERP */ + if ((erp->function == dasd_3990_erp_bus_out) || + (erp->function == dasd_3990_erp_action_1) || + (erp->function == dasd_3990_erp_action_4)) { + + erp = dasd_3990_erp_action_1(erp); + + } else if (erp->function == dasd_3990_erp_action_1_sec) { + erp = dasd_3990_erp_action_1_sec(erp); + } else if (erp->function == dasd_3990_erp_action_5) { + + /* retries have not been successful */ + /* prepare erp for retry on different channel path */ + erp = dasd_3990_erp_action_1(erp); + + if (sense && !(sense[2] & DASD_SENSE_BIT_0)) { + + /* issue a Diagnostic Control command with an + * Inhibit Write subcommand */ + + switch (sense[25]) { + case 0x17: + case 0x57:{ /* controller */ + erp = dasd_3990_erp_DCTL(erp, 0x20); + break; + } + case 0x18: + case 0x58:{ /* channel path */ + erp = dasd_3990_erp_DCTL(erp, 0x40); + break; + } + case 0x19: + case 0x59:{ /* storage director */ + erp = dasd_3990_erp_DCTL(erp, 0x80); + break; + } + default: + DBF_DEV_EVENT(DBF_WARNING, device, + "invalid subcommand modifier 0x%x " + "for Diagnostic Control Command", + sense[25]); + } + } + + /* check for 32 byte sense ERP */ + } else if (sense && + ((erp->function == dasd_3990_erp_compound_retry) || + (erp->function == dasd_3990_erp_compound_path) || + (erp->function == dasd_3990_erp_compound_code) || + (erp->function == dasd_3990_erp_compound_config))) { + + erp = dasd_3990_erp_compound(erp, sense); + + } else { + /* + * No retry left and no additional special handling + * necessary + */ + dev_err(&device->cdev->dev, + "ERP %p has run out of retries and failed\n", erp); + + erp->status = DASD_CQR_FAILED; + } + + return erp; + +} /* end dasd_3990_erp_further_erp */ + +/* + * DASD_3990_ERP_HANDLE_MATCH_ERP + * + * DESCRIPTION + * An error occurred again and an ERP has been detected which is already + * used to handle this error (e.g. retries). + * All prior ERP's are asumed to be successful and therefore removed + * from queue. + * If retry counter of matching erp is already 0, it is checked if further + * action is needed (besides retry) or if the ERP has failed. + * + * PARAMETER + * erp_head first ERP in ERP-chain + * erp ERP that handles the actual error. + * (matching erp) + * + * RETURN VALUES + * erp modified/additional ERP + */ +static struct dasd_ccw_req * +dasd_3990_erp_handle_match_erp(struct dasd_ccw_req *erp_head, + struct dasd_ccw_req *erp) +{ + + struct dasd_device *device = erp_head->startdev; + struct dasd_ccw_req *erp_done = erp_head; /* finished req */ + struct dasd_ccw_req *erp_free = NULL; /* req to be freed */ + + /* loop over successful ERPs and remove them from chanq */ + while (erp_done != erp) { + + if (erp_done == NULL) /* end of chain reached */ + panic(PRINTK_HEADER "Programming error in ERP! The " + "original request was lost\n"); + + /* remove the request from the device queue */ + list_del(&erp_done->blocklist); + + erp_free = erp_done; + erp_done = erp_done->refers; + + /* free the finished erp request */ + dasd_free_erp_request(erp_free, erp_free->memdev); + + } /* end while */ + + if (erp->retries > 0) { + + char *sense = dasd_get_sense(&erp->refers->irb); + + /* check for special retries */ + if (sense && erp->function == dasd_3990_erp_action_4) { + + erp = dasd_3990_erp_action_4(erp, sense); + + } else if (sense && + erp->function == dasd_3990_erp_action_1B_32) { + + erp = dasd_3990_update_1B(erp, sense); + + } else if (sense && erp->function == dasd_3990_erp_int_req) { + + erp = dasd_3990_erp_int_req(erp); + + } else { + /* simple retry */ + DBF_DEV_EVENT(DBF_DEBUG, device, + "%i retries left for erp %p", + erp->retries, erp); + + /* handle the request again... */ + erp->status = DASD_CQR_FILLED; + } + + } else { + /* no retry left - check for further necessary action */ + /* if no further actions, handle rest as permanent error */ + erp = dasd_3990_erp_further_erp(erp); + } + + return erp; + +} /* end dasd_3990_erp_handle_match_erp */ + +/* + * DASD_3990_ERP_ACTION + * + * DESCRIPTION + * control routine for 3990 erp actions. + * Has to be called with the queue lock (namely the s390_irq_lock) acquired. + * + * PARAMETER + * cqr failed cqr (either original cqr or already an erp) + * + * RETURN VALUES + * erp erp-pointer to the head of the ERP action chain. + * This means: + * - either a ptr to an additional ERP cqr or + * - the original given cqr (which's status might + * be modified) + */ +struct dasd_ccw_req * +dasd_3990_erp_action(struct dasd_ccw_req * cqr) +{ + struct dasd_ccw_req *erp = NULL; + struct dasd_device *device = cqr->startdev; + struct dasd_ccw_req *temp_erp = NULL; + + if (device->features & DASD_FEATURE_ERPLOG) { + /* print current erp_chain */ + dev_err(&device->cdev->dev, + "ERP chain at BEGINNING of ERP-ACTION\n"); + for (temp_erp = cqr; + temp_erp != NULL; temp_erp = temp_erp->refers) { + + dev_err(&device->cdev->dev, + "ERP %p (%02x) refers to %p\n", + temp_erp, temp_erp->status, + temp_erp->refers); + } + } + + /* double-check if current erp/cqr was successful */ + if ((scsw_cstat(&cqr->irb.scsw) == 0x00) && + (scsw_dstat(&cqr->irb.scsw) == + (DEV_STAT_CHN_END | DEV_STAT_DEV_END))) { + + DBF_DEV_EVENT(DBF_DEBUG, device, + "ERP called for successful request %p" + " - NO ERP necessary", cqr); + + cqr->status = DASD_CQR_DONE; + + return cqr; + } + + /* check if error happened before */ + erp = dasd_3990_erp_in_erp(cqr); + + if (erp == NULL) { + /* no matching erp found - set up erp */ + erp = dasd_3990_erp_additional_erp(cqr); + if (IS_ERR(erp)) + return erp; + } else { + /* matching erp found - set all leading erp's to DONE */ + erp = dasd_3990_erp_handle_match_erp(cqr, erp); + } + + + /* + * For path verification work we need to stick with the path that was + * originally chosen so that the per path configuration data is + * assigned correctly. + */ + if (test_bit(DASD_CQR_VERIFY_PATH, &erp->flags) && cqr->lpm) { + erp->lpm = cqr->lpm; + } + + if (device->features & DASD_FEATURE_ERPLOG) { + /* print current erp_chain */ + dev_err(&device->cdev->dev, + "ERP chain at END of ERP-ACTION\n"); + for (temp_erp = erp; + temp_erp != NULL; temp_erp = temp_erp->refers) { + + dev_err(&device->cdev->dev, + "ERP %p (%02x) refers to %p\n", + temp_erp, temp_erp->status, + temp_erp->refers); + } + } + + /* enqueue ERP request if it's a new one */ + if (list_empty(&erp->blocklist)) { + cqr->status = DASD_CQR_IN_ERP; + /* add erp request before the cqr */ + list_add_tail(&erp->blocklist, &cqr->blocklist); + } + + + + return erp; + +} /* end dasd_3990_erp_action */ diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c new file mode 100644 index 000000000..dc78a523a --- /dev/null +++ b/drivers/s390/block/dasd_alias.c @@ -0,0 +1,976 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PAV alias management for the DASD ECKD discipline + * + * Copyright IBM Corp. 2007 + * Author(s): Stefan Weinhuber + */ + +#define KMSG_COMPONENT "dasd-eckd" + +#include +#include +#include +#include "dasd_int.h" +#include "dasd_eckd.h" + +#ifdef PRINTK_HEADER +#undef PRINTK_HEADER +#endif /* PRINTK_HEADER */ +#define PRINTK_HEADER "dasd(eckd):" + + +/* + * General concept of alias management: + * - PAV and DASD alias management is specific to the eckd discipline. + * - A device is connected to an lcu as long as the device exists. + * dasd_alias_make_device_known_to_lcu will be called wenn the + * device is checked by the eckd discipline and + * dasd_alias_disconnect_device_from_lcu will be called + * before the device is deleted. + * - The dasd_alias_add_device / dasd_alias_remove_device + * functions mark the point when a device is 'ready for service'. + * - A summary unit check is a rare occasion, but it is mandatory to + * support it. It requires some complex recovery actions before the + * devices can be used again (see dasd_alias_handle_summary_unit_check). + * - dasd_alias_get_start_dev will find an alias device that can be used + * instead of the base device and does some (very simple) load balancing. + * This is the function that gets called for each I/O, so when improving + * something, this function should get faster or better, the rest has just + * to be correct. + */ + + +static void summary_unit_check_handling_work(struct work_struct *); +static void lcu_update_work(struct work_struct *); +static int _schedule_lcu_update(struct alias_lcu *, struct dasd_device *); + +static struct alias_root aliastree = { + .serverlist = LIST_HEAD_INIT(aliastree.serverlist), + .lock = __SPIN_LOCK_UNLOCKED(aliastree.lock), +}; + +static struct alias_server *_find_server(struct dasd_uid *uid) +{ + struct alias_server *pos; + list_for_each_entry(pos, &aliastree.serverlist, server) { + if (!strncmp(pos->uid.vendor, uid->vendor, + sizeof(uid->vendor)) + && !strncmp(pos->uid.serial, uid->serial, + sizeof(uid->serial))) + return pos; + } + return NULL; +} + +static struct alias_lcu *_find_lcu(struct alias_server *server, + struct dasd_uid *uid) +{ + struct alias_lcu *pos; + list_for_each_entry(pos, &server->lculist, lcu) { + if (pos->uid.ssid == uid->ssid) + return pos; + } + return NULL; +} + +static struct alias_pav_group *_find_group(struct alias_lcu *lcu, + struct dasd_uid *uid) +{ + struct alias_pav_group *pos; + __u8 search_unit_addr; + + /* for hyper pav there is only one group */ + if (lcu->pav == HYPER_PAV) { + if (list_empty(&lcu->grouplist)) + return NULL; + else + return list_first_entry(&lcu->grouplist, + struct alias_pav_group, group); + } + + /* for base pav we have to find the group that matches the base */ + if (uid->type == UA_BASE_DEVICE) + search_unit_addr = uid->real_unit_addr; + else + search_unit_addr = uid->base_unit_addr; + list_for_each_entry(pos, &lcu->grouplist, group) { + if (pos->uid.base_unit_addr == search_unit_addr && + !strncmp(pos->uid.vduit, uid->vduit, sizeof(uid->vduit))) + return pos; + } + return NULL; +} + +static struct alias_server *_allocate_server(struct dasd_uid *uid) +{ + struct alias_server *server; + + server = kzalloc(sizeof(*server), GFP_KERNEL); + if (!server) + return ERR_PTR(-ENOMEM); + memcpy(server->uid.vendor, uid->vendor, sizeof(uid->vendor)); + memcpy(server->uid.serial, uid->serial, sizeof(uid->serial)); + INIT_LIST_HEAD(&server->server); + INIT_LIST_HEAD(&server->lculist); + return server; +} + +static void _free_server(struct alias_server *server) +{ + kfree(server); +} + +static struct alias_lcu *_allocate_lcu(struct dasd_uid *uid) +{ + struct alias_lcu *lcu; + + lcu = kzalloc(sizeof(*lcu), GFP_KERNEL); + if (!lcu) + return ERR_PTR(-ENOMEM); + lcu->uac = kzalloc(sizeof(*(lcu->uac)), GFP_KERNEL | GFP_DMA); + if (!lcu->uac) + goto out_err1; + lcu->rsu_cqr = kzalloc(sizeof(*lcu->rsu_cqr), GFP_KERNEL | GFP_DMA); + if (!lcu->rsu_cqr) + goto out_err2; + lcu->rsu_cqr->cpaddr = kzalloc(sizeof(struct ccw1), + GFP_KERNEL | GFP_DMA); + if (!lcu->rsu_cqr->cpaddr) + goto out_err3; + lcu->rsu_cqr->data = kzalloc(16, GFP_KERNEL | GFP_DMA); + if (!lcu->rsu_cqr->data) + goto out_err4; + + memcpy(lcu->uid.vendor, uid->vendor, sizeof(uid->vendor)); + memcpy(lcu->uid.serial, uid->serial, sizeof(uid->serial)); + lcu->uid.ssid = uid->ssid; + lcu->pav = NO_PAV; + lcu->flags = NEED_UAC_UPDATE | UPDATE_PENDING; + INIT_LIST_HEAD(&lcu->lcu); + INIT_LIST_HEAD(&lcu->inactive_devices); + INIT_LIST_HEAD(&lcu->active_devices); + INIT_LIST_HEAD(&lcu->grouplist); + INIT_WORK(&lcu->suc_data.worker, summary_unit_check_handling_work); + INIT_DELAYED_WORK(&lcu->ruac_data.dwork, lcu_update_work); + spin_lock_init(&lcu->lock); + init_completion(&lcu->lcu_setup); + return lcu; + +out_err4: + kfree(lcu->rsu_cqr->cpaddr); +out_err3: + kfree(lcu->rsu_cqr); +out_err2: + kfree(lcu->uac); +out_err1: + kfree(lcu); + return ERR_PTR(-ENOMEM); +} + +static void _free_lcu(struct alias_lcu *lcu) +{ + kfree(lcu->rsu_cqr->data); + kfree(lcu->rsu_cqr->cpaddr); + kfree(lcu->rsu_cqr); + kfree(lcu->uac); + kfree(lcu); +} + +/* + * This is the function that will allocate all the server and lcu data, + * so this function must be called first for a new device. + * If the return value is 1, the lcu was already known before, if it + * is 0, this is a new lcu. + * Negative return code indicates that something went wrong (e.g. -ENOMEM) + */ +int dasd_alias_make_device_known_to_lcu(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + unsigned long flags; + struct alias_server *server, *newserver; + struct alias_lcu *lcu, *newlcu; + struct dasd_uid uid; + + device->discipline->get_uid(device, &uid); + spin_lock_irqsave(&aliastree.lock, flags); + server = _find_server(&uid); + if (!server) { + spin_unlock_irqrestore(&aliastree.lock, flags); + newserver = _allocate_server(&uid); + if (IS_ERR(newserver)) + return PTR_ERR(newserver); + spin_lock_irqsave(&aliastree.lock, flags); + server = _find_server(&uid); + if (!server) { + list_add(&newserver->server, &aliastree.serverlist); + server = newserver; + } else { + /* someone was faster */ + _free_server(newserver); + } + } + + lcu = _find_lcu(server, &uid); + if (!lcu) { + spin_unlock_irqrestore(&aliastree.lock, flags); + newlcu = _allocate_lcu(&uid); + if (IS_ERR(newlcu)) + return PTR_ERR(newlcu); + spin_lock_irqsave(&aliastree.lock, flags); + lcu = _find_lcu(server, &uid); + if (!lcu) { + list_add(&newlcu->lcu, &server->lculist); + lcu = newlcu; + } else { + /* someone was faster */ + _free_lcu(newlcu); + } + } + spin_lock(&lcu->lock); + list_add(&device->alias_list, &lcu->inactive_devices); + private->lcu = lcu; + spin_unlock(&lcu->lock); + spin_unlock_irqrestore(&aliastree.lock, flags); + + return 0; +} + +/* + * This function removes a device from the scope of alias management. + * The complicated part is to make sure that it is not in use by + * any of the workers. If necessary cancel the work. + */ +void dasd_alias_disconnect_device_from_lcu(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + unsigned long flags; + struct alias_lcu *lcu; + struct alias_server *server; + int was_pending; + struct dasd_uid uid; + + lcu = private->lcu; + /* nothing to do if already disconnected */ + if (!lcu) + return; + device->discipline->get_uid(device, &uid); + spin_lock_irqsave(&lcu->lock, flags); + /* make sure that the workers don't use this device */ + if (device == lcu->suc_data.device) { + spin_unlock_irqrestore(&lcu->lock, flags); + cancel_work_sync(&lcu->suc_data.worker); + spin_lock_irqsave(&lcu->lock, flags); + if (device == lcu->suc_data.device) { + dasd_put_device(device); + lcu->suc_data.device = NULL; + } + } + was_pending = 0; + if (device == lcu->ruac_data.device) { + spin_unlock_irqrestore(&lcu->lock, flags); + was_pending = 1; + cancel_delayed_work_sync(&lcu->ruac_data.dwork); + spin_lock_irqsave(&lcu->lock, flags); + if (device == lcu->ruac_data.device) { + dasd_put_device(device); + lcu->ruac_data.device = NULL; + } + } + private->lcu = NULL; + spin_unlock_irqrestore(&lcu->lock, flags); + + spin_lock_irqsave(&aliastree.lock, flags); + spin_lock(&lcu->lock); + list_del_init(&device->alias_list); + if (list_empty(&lcu->grouplist) && + list_empty(&lcu->active_devices) && + list_empty(&lcu->inactive_devices)) { + list_del(&lcu->lcu); + spin_unlock(&lcu->lock); + _free_lcu(lcu); + lcu = NULL; + } else { + if (was_pending) + _schedule_lcu_update(lcu, NULL); + spin_unlock(&lcu->lock); + } + server = _find_server(&uid); + if (server && list_empty(&server->lculist)) { + list_del(&server->server); + _free_server(server); + } + spin_unlock_irqrestore(&aliastree.lock, flags); +} + +/* + * This function assumes that the unit address configuration stored + * in the lcu is up to date and will update the device uid before + * adding it to a pav group. + */ + +static int _add_device_to_lcu(struct alias_lcu *lcu, + struct dasd_device *device, + struct dasd_device *pos) +{ + + struct dasd_eckd_private *private = device->private; + struct alias_pav_group *group; + struct dasd_uid uid; + + spin_lock(get_ccwdev_lock(device->cdev)); + private->uid.type = lcu->uac->unit[private->uid.real_unit_addr].ua_type; + private->uid.base_unit_addr = + lcu->uac->unit[private->uid.real_unit_addr].base_ua; + uid = private->uid; + spin_unlock(get_ccwdev_lock(device->cdev)); + /* if we have no PAV anyway, we don't need to bother with PAV groups */ + if (lcu->pav == NO_PAV) { + list_move(&device->alias_list, &lcu->active_devices); + return 0; + } + group = _find_group(lcu, &uid); + if (!group) { + group = kzalloc(sizeof(*group), GFP_ATOMIC); + if (!group) + return -ENOMEM; + memcpy(group->uid.vendor, uid.vendor, sizeof(uid.vendor)); + memcpy(group->uid.serial, uid.serial, sizeof(uid.serial)); + group->uid.ssid = uid.ssid; + if (uid.type == UA_BASE_DEVICE) + group->uid.base_unit_addr = uid.real_unit_addr; + else + group->uid.base_unit_addr = uid.base_unit_addr; + memcpy(group->uid.vduit, uid.vduit, sizeof(uid.vduit)); + INIT_LIST_HEAD(&group->group); + INIT_LIST_HEAD(&group->baselist); + INIT_LIST_HEAD(&group->aliaslist); + list_add(&group->group, &lcu->grouplist); + } + if (uid.type == UA_BASE_DEVICE) + list_move(&device->alias_list, &group->baselist); + else + list_move(&device->alias_list, &group->aliaslist); + private->pavgroup = group; + return 0; +}; + +static void _remove_device_from_lcu(struct alias_lcu *lcu, + struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + struct alias_pav_group *group; + + list_move(&device->alias_list, &lcu->inactive_devices); + group = private->pavgroup; + if (!group) + return; + private->pavgroup = NULL; + if (list_empty(&group->baselist) && list_empty(&group->aliaslist)) { + list_del(&group->group); + kfree(group); + return; + } + if (group->next == device) + group->next = NULL; +}; + +static int +suborder_not_supported(struct dasd_ccw_req *cqr) +{ + char *sense; + char reason; + char msg_format; + char msg_no; + + /* + * intrc values ENODEV, ENOLINK and EPERM + * will be optained from sleep_on to indicate that no + * IO operation can be started + */ + if (cqr->intrc == -ENODEV) + return 1; + + if (cqr->intrc == -ENOLINK) + return 1; + + if (cqr->intrc == -EPERM) + return 1; + + sense = dasd_get_sense(&cqr->irb); + if (!sense) + return 0; + + reason = sense[0]; + msg_format = (sense[7] & 0xF0); + msg_no = (sense[7] & 0x0F); + + /* command reject, Format 0 MSG 4 - invalid parameter */ + if ((reason == 0x80) && (msg_format == 0x00) && (msg_no == 0x04)) + return 1; + + return 0; +} + +static int read_unit_address_configuration(struct dasd_device *device, + struct alias_lcu *lcu) +{ + struct dasd_psf_prssd_data *prssdp; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + int rc; + unsigned long flags; + + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */, + (sizeof(struct dasd_psf_prssd_data)), + device, NULL); + if (IS_ERR(cqr)) + return PTR_ERR(cqr); + cqr->startdev = device; + cqr->memdev = device; + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + cqr->retries = 10; + cqr->expires = 20 * HZ; + + /* Prepare for Read Subsystem Data */ + prssdp = (struct dasd_psf_prssd_data *) cqr->data; + memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data)); + prssdp->order = PSF_ORDER_PRSSD; + prssdp->suborder = 0x0e; /* Read unit address configuration */ + /* all other bytes of prssdp must be zero */ + + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_PSF; + ccw->count = sizeof(struct dasd_psf_prssd_data); + ccw->flags |= CCW_FLAG_CC; + ccw->cda = (__u32)(addr_t) prssdp; + + /* Read Subsystem Data - feature codes */ + memset(lcu->uac, 0, sizeof(*(lcu->uac))); + + ccw++; + ccw->cmd_code = DASD_ECKD_CCW_RSSD; + ccw->count = sizeof(*(lcu->uac)); + ccw->cda = (__u32)(addr_t) lcu->uac; + + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + + /* need to unset flag here to detect race with summary unit check */ + spin_lock_irqsave(&lcu->lock, flags); + lcu->flags &= ~NEED_UAC_UPDATE; + spin_unlock_irqrestore(&lcu->lock, flags); + + rc = dasd_sleep_on(cqr); + if (!rc) + goto out; + + if (suborder_not_supported(cqr)) { + /* suborder not supported or device unusable for IO */ + rc = -EOPNOTSUPP; + } else { + /* IO failed but should be retried */ + spin_lock_irqsave(&lcu->lock, flags); + lcu->flags |= NEED_UAC_UPDATE; + spin_unlock_irqrestore(&lcu->lock, flags); + } +out: + dasd_sfree_request(cqr, cqr->memdev); + return rc; +} + +static int _lcu_update(struct dasd_device *refdev, struct alias_lcu *lcu) +{ + unsigned long flags; + struct alias_pav_group *pavgroup, *tempgroup; + struct dasd_device *device, *tempdev; + int i, rc; + struct dasd_eckd_private *private; + + spin_lock_irqsave(&lcu->lock, flags); + list_for_each_entry_safe(pavgroup, tempgroup, &lcu->grouplist, group) { + list_for_each_entry_safe(device, tempdev, &pavgroup->baselist, + alias_list) { + list_move(&device->alias_list, &lcu->active_devices); + private = device->private; + private->pavgroup = NULL; + } + list_for_each_entry_safe(device, tempdev, &pavgroup->aliaslist, + alias_list) { + list_move(&device->alias_list, &lcu->active_devices); + private = device->private; + private->pavgroup = NULL; + } + list_del(&pavgroup->group); + kfree(pavgroup); + } + spin_unlock_irqrestore(&lcu->lock, flags); + + rc = read_unit_address_configuration(refdev, lcu); + if (rc) + return rc; + + spin_lock_irqsave(&lcu->lock, flags); + /* + * there is another update needed skip the remaining handling + * the data might already be outdated + * but especially do not add the device to an LCU with pending + * update + */ + if (lcu->flags & NEED_UAC_UPDATE) + goto out; + lcu->pav = NO_PAV; + for (i = 0; i < MAX_DEVICES_PER_LCU; ++i) { + switch (lcu->uac->unit[i].ua_type) { + case UA_BASE_PAV_ALIAS: + lcu->pav = BASE_PAV; + break; + case UA_HYPER_PAV_ALIAS: + lcu->pav = HYPER_PAV; + break; + } + if (lcu->pav != NO_PAV) + break; + } + + list_for_each_entry_safe(device, tempdev, &lcu->active_devices, + alias_list) { + _add_device_to_lcu(lcu, device, refdev); + } +out: + spin_unlock_irqrestore(&lcu->lock, flags); + return 0; +} + +static void lcu_update_work(struct work_struct *work) +{ + struct alias_lcu *lcu; + struct read_uac_work_data *ruac_data; + struct dasd_device *device; + unsigned long flags; + int rc; + + ruac_data = container_of(work, struct read_uac_work_data, dwork.work); + lcu = container_of(ruac_data, struct alias_lcu, ruac_data); + device = ruac_data->device; + rc = _lcu_update(device, lcu); + /* + * Need to check flags again, as there could have been another + * prepare_update or a new device a new device while we were still + * processing the data + */ + spin_lock_irqsave(&lcu->lock, flags); + if ((rc && (rc != -EOPNOTSUPP)) || (lcu->flags & NEED_UAC_UPDATE)) { + DBF_DEV_EVENT(DBF_WARNING, device, "could not update" + " alias data in lcu (rc = %d), retry later", rc); + if (!schedule_delayed_work(&lcu->ruac_data.dwork, 30*HZ)) + dasd_put_device(device); + } else { + dasd_put_device(device); + lcu->ruac_data.device = NULL; + lcu->flags &= ~UPDATE_PENDING; + } + spin_unlock_irqrestore(&lcu->lock, flags); +} + +static int _schedule_lcu_update(struct alias_lcu *lcu, + struct dasd_device *device) +{ + struct dasd_device *usedev = NULL; + struct alias_pav_group *group; + + lcu->flags |= NEED_UAC_UPDATE; + if (lcu->ruac_data.device) { + /* already scheduled or running */ + return 0; + } + if (device && !list_empty(&device->alias_list)) + usedev = device; + + if (!usedev && !list_empty(&lcu->grouplist)) { + group = list_first_entry(&lcu->grouplist, + struct alias_pav_group, group); + if (!list_empty(&group->baselist)) + usedev = list_first_entry(&group->baselist, + struct dasd_device, + alias_list); + else if (!list_empty(&group->aliaslist)) + usedev = list_first_entry(&group->aliaslist, + struct dasd_device, + alias_list); + } + if (!usedev && !list_empty(&lcu->active_devices)) { + usedev = list_first_entry(&lcu->active_devices, + struct dasd_device, alias_list); + } + /* + * if we haven't found a proper device yet, give up for now, the next + * device that will be set active will trigger an lcu update + */ + if (!usedev) + return -EINVAL; + dasd_get_device(usedev); + lcu->ruac_data.device = usedev; + if (!schedule_delayed_work(&lcu->ruac_data.dwork, 0)) + dasd_put_device(usedev); + return 0; +} + +int dasd_alias_add_device(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + __u8 uaddr = private->uid.real_unit_addr; + struct alias_lcu *lcu = private->lcu; + unsigned long flags; + int rc; + + rc = 0; + spin_lock_irqsave(&lcu->lock, flags); + /* + * Check if device and lcu type differ. If so, the uac data may be + * outdated and needs to be updated. + */ + if (private->uid.type != lcu->uac->unit[uaddr].ua_type) { + lcu->flags |= UPDATE_PENDING; + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "uid type mismatch - trigger rescan"); + } + if (!(lcu->flags & UPDATE_PENDING)) { + rc = _add_device_to_lcu(lcu, device, device); + if (rc) + lcu->flags |= UPDATE_PENDING; + } + if (lcu->flags & UPDATE_PENDING) { + list_move(&device->alias_list, &lcu->active_devices); + private->pavgroup = NULL; + _schedule_lcu_update(lcu, device); + } + spin_unlock_irqrestore(&lcu->lock, flags); + return rc; +} + +int dasd_alias_update_add_device(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + + private->lcu->flags |= UPDATE_PENDING; + return dasd_alias_add_device(device); +} + +int dasd_alias_remove_device(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + struct alias_lcu *lcu = private->lcu; + unsigned long flags; + + /* nothing to do if already removed */ + if (!lcu) + return 0; + spin_lock_irqsave(&lcu->lock, flags); + _remove_device_from_lcu(lcu, device); + spin_unlock_irqrestore(&lcu->lock, flags); + return 0; +} + +struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *base_device) +{ + struct dasd_eckd_private *alias_priv, *private = base_device->private; + struct alias_pav_group *group = private->pavgroup; + struct alias_lcu *lcu = private->lcu; + struct dasd_device *alias_device; + unsigned long flags; + + if (!group || !lcu) + return NULL; + if (lcu->pav == NO_PAV || + lcu->flags & (NEED_UAC_UPDATE | UPDATE_PENDING)) + return NULL; + if (unlikely(!(private->features.feature[8] & 0x01))) { + /* + * PAV enabled but prefix not, very unlikely + * seems to be a lost pathgroup + * use base device to do IO + */ + DBF_DEV_EVENT(DBF_ERR, base_device, "%s", + "Prefix not enabled with PAV enabled\n"); + return NULL; + } + + spin_lock_irqsave(&lcu->lock, flags); + alias_device = group->next; + if (!alias_device) { + if (list_empty(&group->aliaslist)) { + spin_unlock_irqrestore(&lcu->lock, flags); + return NULL; + } else { + alias_device = list_first_entry(&group->aliaslist, + struct dasd_device, + alias_list); + } + } + if (list_is_last(&alias_device->alias_list, &group->aliaslist)) + group->next = list_first_entry(&group->aliaslist, + struct dasd_device, alias_list); + else + group->next = list_first_entry(&alias_device->alias_list, + struct dasd_device, alias_list); + spin_unlock_irqrestore(&lcu->lock, flags); + alias_priv = alias_device->private; + if ((alias_priv->count < private->count) && !alias_device->stopped && + !test_bit(DASD_FLAG_OFFLINE, &alias_device->flags)) + return alias_device; + else + return NULL; +} + +/* + * Summary unit check handling depends on the way alias devices + * are handled so it is done here rather then in dasd_eckd.c + */ +static int reset_summary_unit_check(struct alias_lcu *lcu, + struct dasd_device *device, + char reason) +{ + struct dasd_ccw_req *cqr; + int rc = 0; + struct ccw1 *ccw; + + cqr = lcu->rsu_cqr; + memcpy((char *) &cqr->magic, "ECKD", 4); + ASCEBC((char *) &cqr->magic, 4); + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_RSCK; + ccw->flags = CCW_FLAG_SLI; + ccw->count = 16; + ccw->cda = (__u32)(addr_t) cqr->data; + ((char *)cqr->data)[0] = reason; + + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + cqr->retries = 255; /* set retry counter to enable basic ERP */ + cqr->startdev = device; + cqr->memdev = device; + cqr->block = NULL; + cqr->expires = 5 * HZ; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + + rc = dasd_sleep_on_immediatly(cqr); + return rc; +} + +static void _restart_all_base_devices_on_lcu(struct alias_lcu *lcu) +{ + struct alias_pav_group *pavgroup; + struct dasd_device *device; + struct dasd_eckd_private *private; + + /* active and inactive list can contain alias as well as base devices */ + list_for_each_entry(device, &lcu->active_devices, alias_list) { + private = device->private; + if (private->uid.type != UA_BASE_DEVICE) + continue; + dasd_schedule_block_bh(device->block); + dasd_schedule_device_bh(device); + } + list_for_each_entry(device, &lcu->inactive_devices, alias_list) { + private = device->private; + if (private->uid.type != UA_BASE_DEVICE) + continue; + dasd_schedule_block_bh(device->block); + dasd_schedule_device_bh(device); + } + list_for_each_entry(pavgroup, &lcu->grouplist, group) { + list_for_each_entry(device, &pavgroup->baselist, alias_list) { + dasd_schedule_block_bh(device->block); + dasd_schedule_device_bh(device); + } + } +} + +static void flush_all_alias_devices_on_lcu(struct alias_lcu *lcu) +{ + struct alias_pav_group *pavgroup; + struct dasd_device *device, *temp; + struct dasd_eckd_private *private; + unsigned long flags; + LIST_HEAD(active); + + /* + * Problem here ist that dasd_flush_device_queue may wait + * for termination of a request to complete. We can't keep + * the lcu lock during that time, so we must assume that + * the lists may have changed. + * Idea: first gather all active alias devices in a separate list, + * then flush the first element of this list unlocked, and afterwards + * check if it is still on the list before moving it to the + * active_devices list. + */ + + spin_lock_irqsave(&lcu->lock, flags); + list_for_each_entry_safe(device, temp, &lcu->active_devices, + alias_list) { + private = device->private; + if (private->uid.type == UA_BASE_DEVICE) + continue; + list_move(&device->alias_list, &active); + } + + list_for_each_entry(pavgroup, &lcu->grouplist, group) { + list_splice_init(&pavgroup->aliaslist, &active); + } + while (!list_empty(&active)) { + device = list_first_entry(&active, struct dasd_device, + alias_list); + spin_unlock_irqrestore(&lcu->lock, flags); + dasd_flush_device_queue(device); + spin_lock_irqsave(&lcu->lock, flags); + /* + * only move device around if it wasn't moved away while we + * were waiting for the flush + */ + if (device == list_first_entry(&active, + struct dasd_device, alias_list)) { + list_move(&device->alias_list, &lcu->active_devices); + private = device->private; + private->pavgroup = NULL; + } + } + spin_unlock_irqrestore(&lcu->lock, flags); +} + +static void _stop_all_devices_on_lcu(struct alias_lcu *lcu) +{ + struct alias_pav_group *pavgroup; + struct dasd_device *device; + + list_for_each_entry(device, &lcu->active_devices, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); + dasd_device_set_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } + list_for_each_entry(device, &lcu->inactive_devices, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); + dasd_device_set_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } + list_for_each_entry(pavgroup, &lcu->grouplist, group) { + list_for_each_entry(device, &pavgroup->baselist, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); + dasd_device_set_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } + list_for_each_entry(device, &pavgroup->aliaslist, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); + dasd_device_set_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } + } +} + +static void _unstop_all_devices_on_lcu(struct alias_lcu *lcu) +{ + struct alias_pav_group *pavgroup; + struct dasd_device *device; + + list_for_each_entry(device, &lcu->active_devices, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); + dasd_device_remove_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } + list_for_each_entry(device, &lcu->inactive_devices, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); + dasd_device_remove_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } + list_for_each_entry(pavgroup, &lcu->grouplist, group) { + list_for_each_entry(device, &pavgroup->baselist, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); + dasd_device_remove_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } + list_for_each_entry(device, &pavgroup->aliaslist, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); + dasd_device_remove_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } + } +} + +static void summary_unit_check_handling_work(struct work_struct *work) +{ + struct alias_lcu *lcu; + struct summary_unit_check_work_data *suc_data; + unsigned long flags; + struct dasd_device *device; + + suc_data = container_of(work, struct summary_unit_check_work_data, + worker); + lcu = container_of(suc_data, struct alias_lcu, suc_data); + device = suc_data->device; + + /* 1. flush alias devices */ + flush_all_alias_devices_on_lcu(lcu); + + /* 2. reset summary unit check */ + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + dasd_device_remove_stop_bits(device, + (DASD_STOPPED_SU | DASD_STOPPED_PENDING)); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + reset_summary_unit_check(lcu, device, suc_data->reason); + + spin_lock_irqsave(&lcu->lock, flags); + _unstop_all_devices_on_lcu(lcu); + _restart_all_base_devices_on_lcu(lcu); + /* 3. read new alias configuration */ + _schedule_lcu_update(lcu, device); + lcu->suc_data.device = NULL; + dasd_put_device(device); + spin_unlock_irqrestore(&lcu->lock, flags); +} + +void dasd_alias_handle_summary_unit_check(struct work_struct *work) +{ + struct dasd_device *device = container_of(work, struct dasd_device, + suc_work); + struct dasd_eckd_private *private = device->private; + struct alias_lcu *lcu; + unsigned long flags; + + lcu = private->lcu; + if (!lcu) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "device not ready to handle summary" + " unit check (no lcu structure)"); + goto out; + } + spin_lock_irqsave(&lcu->lock, flags); + /* If this device is about to be removed just return and wait for + * the next interrupt on a different device + */ + if (list_empty(&device->alias_list)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "device is in offline processing," + " don't do summary unit check handling"); + goto out_unlock; + } + if (lcu->suc_data.device) { + /* already scheduled or running */ + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "previous instance of summary unit check worker" + " still pending"); + goto out_unlock; + } + _stop_all_devices_on_lcu(lcu); + /* prepare for lcu_update */ + lcu->flags |= NEED_UAC_UPDATE | UPDATE_PENDING; + lcu->suc_data.reason = private->suc_reason; + lcu->suc_data.device = device; + dasd_get_device(device); + if (!schedule_work(&lcu->suc_data.worker)) + dasd_put_device(device); +out_unlock: + spin_unlock_irqrestore(&lcu->lock, flags); +out: + clear_bit(DASD_FLAG_SUC, &device->flags); + dasd_put_device(device); +}; diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c new file mode 100644 index 000000000..fab35c617 --- /dev/null +++ b/drivers/s390/block/dasd_devmap.c @@ -0,0 +1,1747 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Holger Smolinski + * Horst Hummel + * Carsten Otte + * Martin Schwidefsky + * Bugreports.to..: + * Copyright IBM Corp. 1999,2001 + * + * Device mapping and dasd= parameter parsing functions. All devmap + * functions may not be called from interrupt context. In particular + * dasd_get_device is a no-no from interrupt context. + * + */ + +#define KMSG_COMPONENT "dasd" + +#include +#include +#include +#include + +#include +#include +#include + +/* This is ugly... */ +#define PRINTK_HEADER "dasd_devmap:" +#define DASD_BUS_ID_SIZE 20 +#define DASD_MAX_PARAMS 256 + +#include "dasd_int.h" + +struct kmem_cache *dasd_page_cache; +EXPORT_SYMBOL_GPL(dasd_page_cache); + +/* + * dasd_devmap_t is used to store the features and the relation + * between device number and device index. To find a dasd_devmap_t + * that corresponds to a device number of a device index each + * dasd_devmap_t is added to two linked lists, one to search by + * the device number and one to search by the device index. As + * soon as big minor numbers are available the device index list + * can be removed since the device number will then be identical + * to the device index. + */ +struct dasd_devmap { + struct list_head list; + char bus_id[DASD_BUS_ID_SIZE]; + unsigned int devindex; + unsigned short features; + struct dasd_device *device; +}; + +/* + * Parameter parsing functions for dasd= parameter. The syntax is: + * : (0x)?[0-9a-fA-F]+ + * : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ + * : ro + * : \((:)*\) + * : (-)?? + * : (-)?? + * : | + * : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod + * + * : autodetect|probeonly|(,)* + */ + +int dasd_probeonly = 0; /* is true, when probeonly mode is active */ +int dasd_autodetect = 0; /* is true, when autodetection is active */ +int dasd_nopav = 0; /* is true, when PAV is disabled */ +EXPORT_SYMBOL_GPL(dasd_nopav); +int dasd_nofcx; /* disable High Performance Ficon */ +EXPORT_SYMBOL_GPL(dasd_nofcx); + +/* + * char *dasd[] is intended to hold the ranges supplied by the dasd= statement + * it is named 'dasd' to directly be filled by insmod with the comma separated + * strings when running as a module. + */ +static char *dasd[DASD_MAX_PARAMS]; +module_param_array(dasd, charp, NULL, S_IRUGO); + +/* + * Single spinlock to protect devmap and servermap structures and lists. + */ +static DEFINE_SPINLOCK(dasd_devmap_lock); + +/* + * Hash lists for devmap structures. + */ +static struct list_head dasd_hashlists[256]; +int dasd_max_devindex; + +static struct dasd_devmap *dasd_add_busid(const char *, int); + +static inline int +dasd_hash_busid(const char *bus_id) +{ + int hash, i; + + hash = 0; + for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++) + hash += *bus_id; + return hash & 0xff; +} + +#ifndef MODULE +static int __init dasd_call_setup(char *opt) +{ + static int i __initdata; + char *tmp; + + while (i < DASD_MAX_PARAMS) { + tmp = strsep(&opt, ","); + if (!tmp) + break; + + dasd[i++] = tmp; + } + + return 1; +} + +__setup ("dasd=", dasd_call_setup); +#endif /* #ifndef MODULE */ + +#define DASD_IPLDEV "ipldev" + +/* + * Read a device busid/devno from a string. + */ +static int __init dasd_busid(char *str, int *id0, int *id1, int *devno) +{ + unsigned int val; + char *tok; + + /* Interpret ipldev busid */ + if (strncmp(DASD_IPLDEV, str, strlen(DASD_IPLDEV)) == 0) { + if (ipl_info.type != IPL_TYPE_CCW) { + pr_err("The IPL device is not a CCW device\n"); + return -EINVAL; + } + *id0 = 0; + *id1 = ipl_info.data.ccw.dev_id.ssid; + *devno = ipl_info.data.ccw.dev_id.devno; + + return 0; + } + + /* Old style 0xXXXX or XXXX */ + if (!kstrtouint(str, 16, &val)) { + *id0 = *id1 = 0; + if (val > 0xffff) + return -EINVAL; + *devno = val; + return 0; + } + + /* New style x.y.z busid */ + tok = strsep(&str, "."); + if (kstrtouint(tok, 16, &val) || val > 0xff) + return -EINVAL; + *id0 = val; + + tok = strsep(&str, "."); + if (kstrtouint(tok, 16, &val) || val > 0xff) + return -EINVAL; + *id1 = val; + + tok = strsep(&str, "."); + if (kstrtouint(tok, 16, &val) || val > 0xffff) + return -EINVAL; + *devno = val; + + return 0; +} + +/* + * Read colon separated list of dasd features. + */ +static int __init dasd_feature_list(char *str) +{ + int features, len, rc; + + features = 0; + rc = 0; + + if (!str) + return DASD_FEATURE_DEFAULT; + + while (1) { + for (len = 0; + str[len] && str[len] != ':' && str[len] != ')'; len++); + if (len == 2 && !strncmp(str, "ro", 2)) + features |= DASD_FEATURE_READONLY; + else if (len == 4 && !strncmp(str, "diag", 4)) + features |= DASD_FEATURE_USEDIAG; + else if (len == 3 && !strncmp(str, "raw", 3)) + features |= DASD_FEATURE_USERAW; + else if (len == 6 && !strncmp(str, "erplog", 6)) + features |= DASD_FEATURE_ERPLOG; + else if (len == 8 && !strncmp(str, "failfast", 8)) + features |= DASD_FEATURE_FAILFAST; + else { + pr_warn("%*s is not a supported device option\n", + len, str); + rc = -EINVAL; + } + str += len; + if (*str != ':') + break; + str++; + } + + return rc ? : features; +} + +/* + * Try to match the first element on the comma separated parse string + * with one of the known keywords. If a keyword is found, take the approprate + * action and return a pointer to the residual string. If the first element + * could not be matched to any keyword then return an error code. + */ +static int __init dasd_parse_keyword(char *keyword) +{ + int length = strlen(keyword); + + if (strncmp("autodetect", keyword, length) == 0) { + dasd_autodetect = 1; + pr_info("The autodetection mode has been activated\n"); + return 0; + } + if (strncmp("probeonly", keyword, length) == 0) { + dasd_probeonly = 1; + pr_info("The probeonly mode has been activated\n"); + return 0; + } + if (strncmp("nopav", keyword, length) == 0) { + if (MACHINE_IS_VM) + pr_info("'nopav' is not supported on z/VM\n"); + else { + dasd_nopav = 1; + pr_info("PAV support has be deactivated\n"); + } + return 0; + } + if (strncmp("nofcx", keyword, length) == 0) { + dasd_nofcx = 1; + pr_info("High Performance FICON support has been " + "deactivated\n"); + return 0; + } + if (strncmp("fixedbuffers", keyword, length) == 0) { + if (dasd_page_cache) + return 0; + dasd_page_cache = + kmem_cache_create("dasd_page_cache", PAGE_SIZE, + PAGE_SIZE, SLAB_CACHE_DMA, + NULL); + if (!dasd_page_cache) + DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, " + "fixed buffer mode disabled."); + else + DBF_EVENT(DBF_INFO, "%s", + "turning on fixed buffer mode"); + return 0; + } + + return -EINVAL; +} + +/* + * Split a string of a device range into its pieces and return the from, to, and + * feature parts separately. + * e.g.: + * 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog + * 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw + * 0x4321 -> from: 0x4321 to: null features: null + */ +static int __init dasd_evaluate_range_param(char *range, char **from_str, + char **to_str, char **features_str) +{ + int rc = 0; + + /* Do we have a range or a single device? */ + if (strchr(range, '-')) { + *from_str = strsep(&range, "-"); + *to_str = strsep(&range, "("); + *features_str = strsep(&range, ")"); + } else { + *from_str = strsep(&range, "("); + *features_str = strsep(&range, ")"); + } + + if (*features_str && !range) { + pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n"); + rc = -EINVAL; + } + + return rc; +} + +/* + * Try to interprete the range string as a device number or a range of devices. + * If the interpretation is successful, create the matching dasd_devmap entries. + * If interpretation fails or in case of an error, return an error code. + */ +static int __init dasd_parse_range(const char *range) +{ + struct dasd_devmap *devmap; + int from, from_id0, from_id1; + int to, to_id0, to_id1; + int features; + char bus_id[DASD_BUS_ID_SIZE + 1]; + char *features_str = NULL; + char *from_str = NULL; + char *to_str = NULL; + int rc = 0; + char *tmp; + + tmp = kstrdup(range, GFP_KERNEL); + if (!tmp) + return -ENOMEM; + + if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) { + rc = -EINVAL; + goto out; + } + + if (dasd_busid(from_str, &from_id0, &from_id1, &from)) { + rc = -EINVAL; + goto out; + } + + to = from; + to_id0 = from_id0; + to_id1 = from_id1; + if (to_str) { + if (dasd_busid(to_str, &to_id0, &to_id1, &to)) { + rc = -EINVAL; + goto out; + } + if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) { + pr_err("%s is not a valid device range\n", range); + rc = -EINVAL; + goto out; + } + } + + features = dasd_feature_list(features_str); + if (features < 0) { + rc = -EINVAL; + goto out; + } + /* each device in dasd= parameter should be set initially online */ + features |= DASD_FEATURE_INITIAL_ONLINE; + while (from <= to) { + sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++); + devmap = dasd_add_busid(bus_id, features); + if (IS_ERR(devmap)) { + rc = PTR_ERR(devmap); + goto out; + } + } + +out: + kfree(tmp); + + return rc; +} + +/* + * Parse parameters stored in dasd[] + * The 'dasd=...' parameter allows to specify a comma separated list of + * keywords and device ranges. The parameters in that list will be stored as + * separate elementes in dasd[]. + */ +int __init dasd_parse(void) +{ + int rc, i; + char *cur; + + rc = 0; + for (i = 0; i < DASD_MAX_PARAMS; i++) { + cur = dasd[i]; + if (!cur) + break; + if (*cur == '\0') + continue; + + rc = dasd_parse_keyword(cur); + if (rc) + rc = dasd_parse_range(cur); + + if (rc) + break; + } + + return rc; +} + +/* + * Add a devmap for the device specified by busid. It is possible that + * the devmap already exists (dasd= parameter). The order of the devices + * added through this function will define the kdevs for the individual + * devices. + */ +static struct dasd_devmap * +dasd_add_busid(const char *bus_id, int features) +{ + struct dasd_devmap *devmap, *new, *tmp; + int hash; + + new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); + if (!new) + return ERR_PTR(-ENOMEM); + spin_lock(&dasd_devmap_lock); + devmap = NULL; + hash = dasd_hash_busid(bus_id); + list_for_each_entry(tmp, &dasd_hashlists[hash], list) + if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { + devmap = tmp; + break; + } + if (!devmap) { + /* This bus_id is new. */ + new->devindex = dasd_max_devindex++; + strlcpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE); + new->features = features; + new->device = NULL; + list_add(&new->list, &dasd_hashlists[hash]); + devmap = new; + new = NULL; + } + spin_unlock(&dasd_devmap_lock); + kfree(new); + return devmap; +} + +/* + * Find devmap for device with given bus_id. + */ +static struct dasd_devmap * +dasd_find_busid(const char *bus_id) +{ + struct dasd_devmap *devmap, *tmp; + int hash; + + spin_lock(&dasd_devmap_lock); + devmap = ERR_PTR(-ENODEV); + hash = dasd_hash_busid(bus_id); + list_for_each_entry(tmp, &dasd_hashlists[hash], list) { + if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { + devmap = tmp; + break; + } + } + spin_unlock(&dasd_devmap_lock); + return devmap; +} + +/* + * Check if busid has been added to the list of dasd ranges. + */ +int +dasd_busid_known(const char *bus_id) +{ + return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; +} + +/* + * Forget all about the device numbers added so far. + * This may only be called at module unload or system shutdown. + */ +static void +dasd_forget_ranges(void) +{ + struct dasd_devmap *devmap, *n; + int i; + + spin_lock(&dasd_devmap_lock); + for (i = 0; i < 256; i++) { + list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { + BUG_ON(devmap->device != NULL); + list_del(&devmap->list); + kfree(devmap); + } + } + spin_unlock(&dasd_devmap_lock); +} + +/* + * Find the device struct by its device index. + */ +struct dasd_device * +dasd_device_from_devindex(int devindex) +{ + struct dasd_devmap *devmap, *tmp; + struct dasd_device *device; + int i; + + spin_lock(&dasd_devmap_lock); + devmap = NULL; + for (i = 0; (i < 256) && !devmap; i++) + list_for_each_entry(tmp, &dasd_hashlists[i], list) + if (tmp->devindex == devindex) { + /* Found the devmap for the device. */ + devmap = tmp; + break; + } + if (devmap && devmap->device) { + device = devmap->device; + dasd_get_device(device); + } else + device = ERR_PTR(-ENODEV); + spin_unlock(&dasd_devmap_lock); + return device; +} + +/* + * Return devmap for cdev. If no devmap exists yet, create one and + * connect it to the cdev. + */ +static struct dasd_devmap * +dasd_devmap_from_cdev(struct ccw_device *cdev) +{ + struct dasd_devmap *devmap; + + devmap = dasd_find_busid(dev_name(&cdev->dev)); + if (IS_ERR(devmap)) + devmap = dasd_add_busid(dev_name(&cdev->dev), + DASD_FEATURE_DEFAULT); + return devmap; +} + +/* + * Create a dasd device structure for cdev. + */ +struct dasd_device * +dasd_create_device(struct ccw_device *cdev) +{ + struct dasd_devmap *devmap; + struct dasd_device *device; + unsigned long flags; + int rc; + + devmap = dasd_devmap_from_cdev(cdev); + if (IS_ERR(devmap)) + return (void *) devmap; + + device = dasd_alloc_device(); + if (IS_ERR(device)) + return device; + atomic_set(&device->ref_count, 3); + + spin_lock(&dasd_devmap_lock); + if (!devmap->device) { + devmap->device = device; + device->devindex = devmap->devindex; + device->features = devmap->features; + get_device(&cdev->dev); + device->cdev = cdev; + rc = 0; + } else + /* Someone else was faster. */ + rc = -EBUSY; + spin_unlock(&dasd_devmap_lock); + + if (rc) { + dasd_free_device(device); + return ERR_PTR(rc); + } + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + dev_set_drvdata(&cdev->dev, device); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + + return device; +} + +/* + * Wait queue for dasd_delete_device waits. + */ +static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); + +/* + * Remove a dasd device structure. The passed referenced + * is destroyed. + */ +void +dasd_delete_device(struct dasd_device *device) +{ + struct ccw_device *cdev; + struct dasd_devmap *devmap; + unsigned long flags; + + /* First remove device pointer from devmap. */ + devmap = dasd_find_busid(dev_name(&device->cdev->dev)); + BUG_ON(IS_ERR(devmap)); + spin_lock(&dasd_devmap_lock); + if (devmap->device != device) { + spin_unlock(&dasd_devmap_lock); + dasd_put_device(device); + return; + } + devmap->device = NULL; + spin_unlock(&dasd_devmap_lock); + + /* Disconnect dasd_device structure from ccw_device structure. */ + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + dev_set_drvdata(&device->cdev->dev, NULL); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + + /* + * Drop ref_count by 3, one for the devmap reference, one for + * the cdev reference and one for the passed reference. + */ + atomic_sub(3, &device->ref_count); + + /* Wait for reference counter to drop to zero. */ + wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); + + dasd_generic_free_discipline(device); + /* Disconnect dasd_device structure from ccw_device structure. */ + cdev = device->cdev; + device->cdev = NULL; + + /* Put ccw_device structure. */ + put_device(&cdev->dev); + + /* Now the device structure can be freed. */ + dasd_free_device(device); +} + +/* + * Reference counter dropped to zero. Wake up waiter + * in dasd_delete_device. + */ +void +dasd_put_device_wake(struct dasd_device *device) +{ + wake_up(&dasd_delete_wq); +} +EXPORT_SYMBOL_GPL(dasd_put_device_wake); + +/* + * Return dasd_device structure associated with cdev. + * This function needs to be called with the ccw device + * lock held. It can be used from interrupt context. + */ +struct dasd_device * +dasd_device_from_cdev_locked(struct ccw_device *cdev) +{ + struct dasd_device *device = dev_get_drvdata(&cdev->dev); + + if (!device) + return ERR_PTR(-ENODEV); + dasd_get_device(device); + return device; +} + +/* + * Return dasd_device structure associated with cdev. + */ +struct dasd_device * +dasd_device_from_cdev(struct ccw_device *cdev) +{ + struct dasd_device *device; + unsigned long flags; + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + device = dasd_device_from_cdev_locked(cdev); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + return device; +} + +void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device) +{ + struct dasd_devmap *devmap; + + devmap = dasd_find_busid(dev_name(&device->cdev->dev)); + if (IS_ERR(devmap)) + return; + spin_lock(&dasd_devmap_lock); + gdp->private_data = devmap; + spin_unlock(&dasd_devmap_lock); +} + +struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp) +{ + struct dasd_device *device; + struct dasd_devmap *devmap; + + if (!gdp->private_data) + return NULL; + device = NULL; + spin_lock(&dasd_devmap_lock); + devmap = gdp->private_data; + if (devmap && devmap->device) { + device = devmap->device; + dasd_get_device(device); + } + spin_unlock(&dasd_devmap_lock); + return device; +} + +/* + * SECTION: files in sysfs + */ + +/* + * failfast controls the behaviour, if no path is available + */ +static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_devmap *devmap; + int ff_flag; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0; + else + ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0; + return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n"); +} + +static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned int val; + int rc; + + if (kstrtouint(buf, 0, &val) || val > 1) + return -EINVAL; + + rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val); + + return rc ? : count; +} + +static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store); + +/* + * readonly controls the readonly status of a dasd + */ +static ssize_t +dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + struct dasd_device *device; + int ro_flag = 0; + + devmap = dasd_find_busid(dev_name(dev)); + if (IS_ERR(devmap)) + goto out; + + ro_flag = !!(devmap->features & DASD_FEATURE_READONLY); + + spin_lock(&dasd_devmap_lock); + device = devmap->device; + if (device) + ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags); + spin_unlock(&dasd_devmap_lock); + +out: + return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); +} + +static ssize_t +dasd_ro_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct dasd_device *device; + unsigned long flags; + unsigned int val; + int rc; + + if (kstrtouint(buf, 0, &val) || val > 1) + return -EINVAL; + + rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val); + if (rc) + return rc; + + device = dasd_device_from_cdev(cdev); + if (IS_ERR(device)) + return count; + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags); + + if (!device->block || !device->block->gdp || + test_bit(DASD_FLAG_OFFLINE, &device->flags)) { + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + goto out; + } + /* Increase open_count to avoid losing the block device */ + atomic_inc(&device->block->open_count); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + + set_disk_ro(device->block->gdp, val); + atomic_dec(&device->block->open_count); + +out: + dasd_put_device(device); + + return count; +} + +static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); +/* + * erplog controls the logging of ERP related data + * (e.g. failing channel programs). + */ +static ssize_t +dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int erplog; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0; + else + erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0; + return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n"); +} + +static ssize_t +dasd_erplog_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned int val; + int rc; + + if (kstrtouint(buf, 0, &val) || val > 1) + return -EINVAL; + + rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val); + + return rc ? : count; +} + +static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store); + +/* + * use_diag controls whether the driver should use diag rather than ssch + * to talk to the device + */ +static ssize_t +dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int use_diag; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0; + else + use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0; + return sprintf(buf, use_diag ? "1\n" : "0\n"); +} + +static ssize_t +dasd_use_diag_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + unsigned int val; + ssize_t rc; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + if (kstrtouint(buf, 0, &val) || val > 1) + return -EINVAL; + + spin_lock(&dasd_devmap_lock); + /* Changing diag discipline flag is only allowed in offline state. */ + rc = count; + if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) { + if (val) + devmap->features |= DASD_FEATURE_USEDIAG; + else + devmap->features &= ~DASD_FEATURE_USEDIAG; + } else + rc = -EPERM; + spin_unlock(&dasd_devmap_lock); + return rc; +} + +static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); + +/* + * use_raw controls whether the driver should give access to raw eckd data or + * operate in standard mode + */ +static ssize_t +dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int use_raw; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0; + else + use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0; + return sprintf(buf, use_raw ? "1\n" : "0\n"); +} + +static ssize_t +dasd_use_raw_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + ssize_t rc; + unsigned long val; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + if ((kstrtoul(buf, 10, &val) != 0) || val > 1) + return -EINVAL; + + spin_lock(&dasd_devmap_lock); + /* Changing diag discipline flag is only allowed in offline state. */ + rc = count; + if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) { + if (val) + devmap->features |= DASD_FEATURE_USERAW; + else + devmap->features &= ~DASD_FEATURE_USERAW; + } else + rc = -EPERM; + spin_unlock(&dasd_devmap_lock); + return rc; +} + +static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show, + dasd_use_raw_store); + +static ssize_t +dasd_safe_offline_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct dasd_device *device; + unsigned long flags; + int rc; + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + device = dasd_device_from_cdev_locked(cdev); + if (IS_ERR(device)) { + rc = PTR_ERR(device); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + goto out; + } + + if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || + test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { + /* Already doing offline processing */ + dasd_put_device(device); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + rc = -EBUSY; + goto out; + } + + set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); + dasd_put_device(device); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + + rc = ccw_device_set_offline(cdev); + +out: + return rc ? rc : count; +} + +static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store); + +static ssize_t +dasd_access_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct dasd_device *device; + int count; + + device = dasd_device_from_cdev(cdev); + if (IS_ERR(device)) + return PTR_ERR(device); + + if (!device->discipline) + count = -ENODEV; + else if (!device->discipline->host_access_count) + count = -EOPNOTSUPP; + else + count = device->discipline->host_access_count(device); + + dasd_put_device(device); + if (count < 0) + return count; + + return sprintf(buf, "%d\n", count); +} + +static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL); + +static ssize_t +dasd_discipline_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_device *device; + ssize_t len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + goto out; + else if (!device->discipline) { + dasd_put_device(device); + goto out; + } else { + len = snprintf(buf, PAGE_SIZE, "%s\n", + device->discipline->name); + dasd_put_device(device); + return len; + } +out: + len = snprintf(buf, PAGE_SIZE, "none\n"); + return len; +} + +static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); + +static ssize_t +dasd_device_status_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_device *device; + ssize_t len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (!IS_ERR(device)) { + switch (device->state) { + case DASD_STATE_NEW: + len = snprintf(buf, PAGE_SIZE, "new\n"); + break; + case DASD_STATE_KNOWN: + len = snprintf(buf, PAGE_SIZE, "detected\n"); + break; + case DASD_STATE_BASIC: + len = snprintf(buf, PAGE_SIZE, "basic\n"); + break; + case DASD_STATE_UNFMT: + len = snprintf(buf, PAGE_SIZE, "unformatted\n"); + break; + case DASD_STATE_READY: + len = snprintf(buf, PAGE_SIZE, "ready\n"); + break; + case DASD_STATE_ONLINE: + len = snprintf(buf, PAGE_SIZE, "online\n"); + break; + default: + len = snprintf(buf, PAGE_SIZE, "no stat\n"); + break; + } + dasd_put_device(device); + } else + len = snprintf(buf, PAGE_SIZE, "unknown\n"); + return len; +} + +static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL); + +static ssize_t dasd_alias_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + struct dasd_uid uid; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return sprintf(buf, "0\n"); + + if (device->discipline && device->discipline->get_uid && + !device->discipline->get_uid(device, &uid)) { + if (uid.type == UA_BASE_PAV_ALIAS || + uid.type == UA_HYPER_PAV_ALIAS) { + dasd_put_device(device); + return sprintf(buf, "1\n"); + } + } + dasd_put_device(device); + + return sprintf(buf, "0\n"); +} + +static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); + +static ssize_t dasd_vendor_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + struct dasd_uid uid; + char *vendor; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + vendor = ""; + if (IS_ERR(device)) + return snprintf(buf, PAGE_SIZE, "%s\n", vendor); + + if (device->discipline && device->discipline->get_uid && + !device->discipline->get_uid(device, &uid)) + vendor = uid.vendor; + + dasd_put_device(device); + + return snprintf(buf, PAGE_SIZE, "%s\n", vendor); +} + +static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); + +#define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\ + /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\ + /* vduit */ 32 + 1) + +static ssize_t +dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + struct dasd_uid uid; + char uid_string[UID_STRLEN]; + char ua_string[3]; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + uid_string[0] = 0; + if (IS_ERR(device)) + return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); + + if (device->discipline && device->discipline->get_uid && + !device->discipline->get_uid(device, &uid)) { + switch (uid.type) { + case UA_BASE_DEVICE: + snprintf(ua_string, sizeof(ua_string), "%02x", + uid.real_unit_addr); + break; + case UA_BASE_PAV_ALIAS: + snprintf(ua_string, sizeof(ua_string), "%02x", + uid.base_unit_addr); + break; + case UA_HYPER_PAV_ALIAS: + snprintf(ua_string, sizeof(ua_string), "xx"); + break; + default: + /* should not happen, treat like base device */ + snprintf(ua_string, sizeof(ua_string), "%02x", + uid.real_unit_addr); + break; + } + + if (strlen(uid.vduit) > 0) + snprintf(uid_string, sizeof(uid_string), + "%s.%s.%04x.%s.%s", + uid.vendor, uid.serial, uid.ssid, ua_string, + uid.vduit); + else + snprintf(uid_string, sizeof(uid_string), + "%s.%s.%04x.%s", + uid.vendor, uid.serial, uid.ssid, ua_string); + } + dasd_put_device(device); + + return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); +} +static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); + +/* + * extended error-reporting + */ +static ssize_t +dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int eer_flag; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap) && devmap->device) + eer_flag = dasd_eer_enabled(devmap->device); + else + eer_flag = 0; + return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); +} + +static ssize_t +dasd_eer_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + unsigned int val; + int rc = 0; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return PTR_ERR(device); + + if (kstrtouint(buf, 0, &val) || val > 1) + return -EINVAL; + + if (val) + rc = dasd_eer_enable(device); + else + dasd_eer_disable(device); + + dasd_put_device(device); + + return rc ? : count; +} + +static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); + +/* + * expiration time for default requests + */ +static ssize_t +dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + int len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_expires_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + unsigned long val; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + + if ((kstrtoul(buf, 10, &val) != 0) || + (val > DASD_EXPIRES_MAX) || val == 0) { + dasd_put_device(device); + return -EINVAL; + } + + if (val) + device->default_expires = val; + + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store); + +static ssize_t +dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + int len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_retries_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + unsigned long val; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + + if ((kstrtoul(buf, 10, &val) != 0) || + (val > DASD_RETRIES_MAX)) { + dasd_put_device(device); + return -EINVAL; + } + + if (val) + device->default_retries = val; + + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store); + +static ssize_t +dasd_timeout_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_device *device; + int len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_timeout_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + struct request_queue *q; + unsigned long val; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device) || !device->block) + return -ENODEV; + + if ((kstrtoul(buf, 10, &val) != 0) || + val > UINT_MAX / HZ) { + dasd_put_device(device); + return -EINVAL; + } + q = device->block->request_queue; + if (!q) { + dasd_put_device(device); + return -ENODEV; + } + + device->blk_timeout = val; + + blk_queue_rq_timeout(q, device->blk_timeout * HZ); + + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(timeout, 0644, + dasd_timeout_show, dasd_timeout_store); + + +static ssize_t +dasd_path_reset_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + unsigned int val; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + + if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff) + val = 0; + + if (device->discipline && device->discipline->reset_path) + device->discipline->reset_path(device, (__u8) val); + + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store); + +static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_device *device; + int hpf; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + if (!device->discipline || !device->discipline->hpf_enabled) { + dasd_put_device(device); + return snprintf(buf, PAGE_SIZE, "%d\n", dasd_nofcx); + } + hpf = device->discipline->hpf_enabled(device); + dasd_put_device(device); + return snprintf(buf, PAGE_SIZE, "%d\n", hpf); +} + +static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL); + +static ssize_t dasd_reservation_policy_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct dasd_devmap *devmap; + int rc = 0; + + devmap = dasd_find_busid(dev_name(dev)); + if (IS_ERR(devmap)) { + rc = snprintf(buf, PAGE_SIZE, "ignore\n"); + } else { + spin_lock(&dasd_devmap_lock); + if (devmap->features & DASD_FEATURE_FAILONSLCK) + rc = snprintf(buf, PAGE_SIZE, "fail\n"); + else + rc = snprintf(buf, PAGE_SIZE, "ignore\n"); + spin_unlock(&dasd_devmap_lock); + } + return rc; +} + +static ssize_t dasd_reservation_policy_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ccw_device *cdev = to_ccwdev(dev); + int rc; + + if (sysfs_streq("ignore", buf)) + rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0); + else if (sysfs_streq("fail", buf)) + rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1); + else + rc = -EINVAL; + + return rc ? : count; +} + +static DEVICE_ATTR(reservation_policy, 0644, + dasd_reservation_policy_show, dasd_reservation_policy_store); + +static ssize_t dasd_reservation_state_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct dasd_device *device; + int rc = 0; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return snprintf(buf, PAGE_SIZE, "none\n"); + + if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) + rc = snprintf(buf, PAGE_SIZE, "reserved\n"); + else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) + rc = snprintf(buf, PAGE_SIZE, "lost\n"); + else + rc = snprintf(buf, PAGE_SIZE, "none\n"); + dasd_put_device(device); + return rc; +} + +static ssize_t dasd_reservation_state_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + int rc = 0; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + if (sysfs_streq("reset", buf)) + clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags); + else + rc = -EINVAL; + dasd_put_device(device); + + if (rc) + return rc; + else + return count; +} + +static DEVICE_ATTR(last_known_reservation_state, 0644, + dasd_reservation_state_show, dasd_reservation_state_store); + +static ssize_t dasd_pm_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return sprintf(buf, "0\n"); + + opm = dasd_path_get_opm(device); + nppm = dasd_path_get_nppm(device); + cablepm = dasd_path_get_cablepm(device); + cuirpm = dasd_path_get_cuirpm(device); + hpfpm = dasd_path_get_hpfpm(device); + ifccpm = dasd_path_get_ifccpm(device); + dasd_put_device(device); + + return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm, + cablepm, cuirpm, hpfpm, ifccpm); +} + +static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL); + +/* + * threshold value for IFCC/CCC errors + */ +static ssize_t +dasd_path_threshold_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + int len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_thrhld); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_path_threshold_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + unsigned long flags; + unsigned long val; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + + if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) { + dasd_put_device(device); + return -EINVAL; + } + spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); + device->path_thrhld = val; + spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); + dasd_put_device(device); + return count; +} +static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show, + dasd_path_threshold_store); + +/* + * configure if path is disabled after IFCC/CCC error threshold is + * exceeded + */ +static ssize_t +dasd_path_autodisable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int flag; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0; + else + flag = (DASD_FEATURE_DEFAULT & + DASD_FEATURE_PATH_AUTODISABLE) != 0; + return snprintf(buf, PAGE_SIZE, flag ? "1\n" : "0\n"); +} + +static ssize_t +dasd_path_autodisable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned int val; + int rc; + + if (kstrtouint(buf, 0, &val) || val > 1) + return -EINVAL; + + rc = dasd_set_feature(to_ccwdev(dev), + DASD_FEATURE_PATH_AUTODISABLE, val); + + return rc ? : count; +} + +static DEVICE_ATTR(path_autodisable, 0644, + dasd_path_autodisable_show, + dasd_path_autodisable_store); +/* + * interval for IFCC/CCC checks + * meaning time with no IFCC/CCC error before the error counter + * gets reset + */ +static ssize_t +dasd_path_interval_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + int len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_interval); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_path_interval_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + unsigned long flags; + unsigned long val; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + + if ((kstrtoul(buf, 10, &val) != 0) || + (val > DASD_INTERVAL_MAX) || val == 0) { + dasd_put_device(device); + return -EINVAL; + } + spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); + if (val) + device->path_interval = val; + spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show, + dasd_path_interval_store); + + +static struct attribute * dasd_attrs[] = { + &dev_attr_readonly.attr, + &dev_attr_discipline.attr, + &dev_attr_status.attr, + &dev_attr_alias.attr, + &dev_attr_vendor.attr, + &dev_attr_uid.attr, + &dev_attr_use_diag.attr, + &dev_attr_raw_track_access.attr, + &dev_attr_eer_enabled.attr, + &dev_attr_erplog.attr, + &dev_attr_failfast.attr, + &dev_attr_expires.attr, + &dev_attr_retries.attr, + &dev_attr_timeout.attr, + &dev_attr_reservation_policy.attr, + &dev_attr_last_known_reservation_state.attr, + &dev_attr_safe_offline.attr, + &dev_attr_host_access_count.attr, + &dev_attr_path_masks.attr, + &dev_attr_path_threshold.attr, + &dev_attr_path_autodisable.attr, + &dev_attr_path_interval.attr, + &dev_attr_path_reset.attr, + &dev_attr_hpf.attr, + NULL, +}; + +static const struct attribute_group dasd_attr_group = { + .attrs = dasd_attrs, +}; + +/* + * Return value of the specified feature. + */ +int +dasd_get_feature(struct ccw_device *cdev, int feature) +{ + struct dasd_devmap *devmap; + + devmap = dasd_find_busid(dev_name(&cdev->dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + return ((devmap->features & feature) != 0); +} + +/* + * Set / reset given feature. + * Flag indicates whether to set (!=0) or the reset (=0) the feature. + */ +int +dasd_set_feature(struct ccw_device *cdev, int feature, int flag) +{ + struct dasd_devmap *devmap; + + devmap = dasd_devmap_from_cdev(cdev); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + spin_lock(&dasd_devmap_lock); + if (flag) + devmap->features |= feature; + else + devmap->features &= ~feature; + if (devmap->device) + devmap->device->features = devmap->features; + spin_unlock(&dasd_devmap_lock); + return 0; +} +EXPORT_SYMBOL(dasd_set_feature); + + +int +dasd_add_sysfs_files(struct ccw_device *cdev) +{ + return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group); +} + +void +dasd_remove_sysfs_files(struct ccw_device *cdev) +{ + sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group); +} + + +int +dasd_devmap_init(void) +{ + int i; + + /* Initialize devmap structures. */ + dasd_max_devindex = 0; + for (i = 0; i < 256; i++) + INIT_LIST_HEAD(&dasd_hashlists[i]); + return 0; +} + +void +dasd_devmap_exit(void) +{ + dasd_forget_ranges(); +} diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c new file mode 100644 index 000000000..e1fe02477 --- /dev/null +++ b/drivers/s390/block/dasd_diag.c @@ -0,0 +1,662 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Holger Smolinski + * Based on.......: linux/drivers/s390/block/mdisk.c + * ...............: by Hartmunt Penner + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2000 + * + */ + +#define KMSG_COMPONENT "dasd" + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "dasd_int.h" +#include "dasd_diag.h" + +#define PRINTK_HEADER "dasd(diag):" + +MODULE_LICENSE("GPL"); + +/* The maximum number of blocks per request (max_blocks) is dependent on the + * amount of storage that is available in the static I/O buffer for each + * device. Currently each device gets 2 pages. We want to fit two requests + * into the available memory so that we can immediately start the next if one + * finishes. */ +#define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ + sizeof(struct dasd_diag_req)) / \ + sizeof(struct dasd_diag_bio)) / 2) +#define DIAG_MAX_RETRIES 32 +#define DIAG_TIMEOUT 50 + +static struct dasd_discipline dasd_diag_discipline; + +struct dasd_diag_private { + struct dasd_diag_characteristics rdc_data; + struct dasd_diag_rw_io iob; + struct dasd_diag_init_io iib; + blocknum_t pt_block; + struct ccw_dev_id dev_id; +}; + +struct dasd_diag_req { + unsigned int block_count; + struct dasd_diag_bio bio[0]; +}; + +static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */ + +/* Perform DIAG250 call with block I/O parameter list iob (input and output) + * and function code cmd. + * In case of an exception return 3. Otherwise return result of bitwise OR of + * resulting condition code and DIAG return code. */ +static inline int __dia250(void *iob, int cmd) +{ + register unsigned long reg2 asm ("2") = (unsigned long) iob; + typedef union { + struct dasd_diag_init_io init_io; + struct dasd_diag_rw_io rw_io; + } addr_type; + int rc; + + rc = 3; + asm volatile( + " diag 2,%2,0x250\n" + "0: ipm %0\n" + " srl %0,28\n" + " or %0,3\n" + "1:\n" + EX_TABLE(0b,1b) + : "+d" (rc), "=m" (*(addr_type *) iob) + : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob) + : "3", "cc"); + return rc; +} + +static inline int dia250(void *iob, int cmd) +{ + diag_stat_inc(DIAG_STAT_X250); + return __dia250(iob, cmd); +} + +/* Initialize block I/O to DIAG device using the specified blocksize and + * block offset. On success, return zero and set end_block to contain the + * number of blocks on the device minus the specified offset. Return non-zero + * otherwise. */ +static inline int +mdsk_init_io(struct dasd_device *device, unsigned int blocksize, + blocknum_t offset, blocknum_t *end_block) +{ + struct dasd_diag_private *private = device->private; + struct dasd_diag_init_io *iib = &private->iib; + int rc; + + memset(iib, 0, sizeof (struct dasd_diag_init_io)); + + iib->dev_nr = private->dev_id.devno; + iib->block_size = blocksize; + iib->offset = offset; + iib->flaga = DASD_DIAG_FLAGA_DEFAULT; + + rc = dia250(iib, INIT_BIO); + + if ((rc & 3) == 0 && end_block) + *end_block = iib->end_block; + + return rc; +} + +/* Remove block I/O environment for device. Return zero on success, non-zero + * otherwise. */ +static inline int +mdsk_term_io(struct dasd_device * device) +{ + struct dasd_diag_private *private = device->private; + struct dasd_diag_init_io *iib = &private->iib; + int rc; + + memset(iib, 0, sizeof (struct dasd_diag_init_io)); + iib->dev_nr = private->dev_id.devno; + rc = dia250(iib, TERM_BIO); + return rc; +} + +/* Error recovery for failed DIAG requests - try to reestablish the DIAG + * environment. */ +static void +dasd_diag_erp(struct dasd_device *device) +{ + int rc; + + mdsk_term_io(device); + rc = mdsk_init_io(device, device->block->bp_block, 0, NULL); + if (rc == 4) { + if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags))) + pr_warn("%s: The access mode of a DIAG device changed to read-only\n", + dev_name(&device->cdev->dev)); + rc = 0; + } + if (rc) + pr_warn("%s: DIAG ERP failed with rc=%d\n", + dev_name(&device->cdev->dev), rc); +} + +/* Start a given request at the device. Return zero on success, non-zero + * otherwise. */ +static int +dasd_start_diag(struct dasd_ccw_req * cqr) +{ + struct dasd_device *device; + struct dasd_diag_private *private; + struct dasd_diag_req *dreq; + int rc; + + device = cqr->startdev; + if (cqr->retries < 0) { + DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p " + "- no retry left)", cqr); + cqr->status = DASD_CQR_ERROR; + return -EIO; + } + private = device->private; + dreq = cqr->data; + + private->iob.dev_nr = private->dev_id.devno; + private->iob.key = 0; + private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; + private->iob.block_count = dreq->block_count; + private->iob.interrupt_params = (addr_t) cqr; + private->iob.bio_list = dreq->bio; + private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; + + cqr->startclk = get_tod_clock(); + cqr->starttime = jiffies; + cqr->retries--; + + rc = dia250(&private->iob, RW_BIO); + switch (rc) { + case 0: /* Synchronous I/O finished successfully */ + cqr->stopclk = get_tod_clock(); + cqr->status = DASD_CQR_SUCCESS; + /* Indicate to calling function that only a dasd_schedule_bh() + and no timer is needed */ + rc = -EACCES; + break; + case 8: /* Asynchronous I/O was started */ + cqr->status = DASD_CQR_IN_IO; + rc = 0; + break; + default: /* Error condition */ + cqr->status = DASD_CQR_QUEUED; + DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc); + dasd_diag_erp(device); + rc = -EIO; + break; + } + cqr->intrc = rc; + return rc; +} + +/* Terminate given request at the device. */ +static int +dasd_diag_term_IO(struct dasd_ccw_req * cqr) +{ + struct dasd_device *device; + + device = cqr->startdev; + mdsk_term_io(device); + mdsk_init_io(device, device->block->bp_block, 0, NULL); + cqr->status = DASD_CQR_CLEAR_PENDING; + cqr->stopclk = get_tod_clock(); + dasd_schedule_device_bh(device); + return 0; +} + +/* Handle external interruption. */ +static void dasd_ext_handler(struct ext_code ext_code, + unsigned int param32, unsigned long param64) +{ + struct dasd_ccw_req *cqr, *next; + struct dasd_device *device; + unsigned long expires; + unsigned long flags; + addr_t ip; + int rc; + + switch (ext_code.subcode >> 8) { + case DASD_DIAG_CODE_31BIT: + ip = (addr_t) param32; + break; + case DASD_DIAG_CODE_64BIT: + ip = (addr_t) param64; + break; + default: + return; + } + inc_irq_stat(IRQEXT_DSD); + if (!ip) { /* no intparm: unsolicited interrupt */ + DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited " + "interrupt"); + return; + } + cqr = (struct dasd_ccw_req *) ip; + device = (struct dasd_device *) cqr->startdev; + if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { + DBF_DEV_EVENT(DBF_WARNING, device, + " magic number of dasd_ccw_req 0x%08X doesn't" + " match discipline 0x%08X", + cqr->magic, *(int *) (&device->discipline->name)); + return; + } + + /* get irq lock to modify request queue */ + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + + /* Check for a pending clear operation */ + if (cqr->status == DASD_CQR_CLEAR_PENDING) { + cqr->status = DASD_CQR_CLEARED; + dasd_device_clear_timer(device); + dasd_schedule_device_bh(device); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + return; + } + + cqr->stopclk = get_tod_clock(); + + expires = 0; + if ((ext_code.subcode & 0xff) == 0) { + cqr->status = DASD_CQR_SUCCESS; + /* Start first request on queue if possible -> fast_io. */ + if (!list_empty(&device->ccw_queue)) { + next = list_entry(device->ccw_queue.next, + struct dasd_ccw_req, devlist); + if (next->status == DASD_CQR_QUEUED) { + rc = dasd_start_diag(next); + if (rc == 0) + expires = next->expires; + } + } + } else { + cqr->status = DASD_CQR_QUEUED; + DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for " + "request %p was %d (%d retries left)", cqr, + ext_code.subcode & 0xff, cqr->retries); + dasd_diag_erp(device); + } + + if (expires != 0) + dasd_device_set_timer(device, expires); + else + dasd_device_clear_timer(device); + dasd_schedule_device_bh(device); + + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); +} + +/* Check whether device can be controlled by DIAG discipline. Return zero on + * success, non-zero otherwise. */ +static int +dasd_diag_check_device(struct dasd_device *device) +{ + struct dasd_diag_private *private = device->private; + struct dasd_diag_characteristics *rdc_data; + struct vtoc_cms_label *label; + struct dasd_block *block; + struct dasd_diag_bio bio; + unsigned int sb, bsize; + blocknum_t end_block; + int rc; + + if (private == NULL) { + private = kzalloc(sizeof(*private), GFP_KERNEL); + if (private == NULL) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Allocating memory for private DASD data " + "failed\n"); + return -ENOMEM; + } + ccw_device_get_id(device->cdev, &private->dev_id); + device->private = private; + } + block = dasd_alloc_block(); + if (IS_ERR(block)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "could not allocate dasd block structure"); + device->private = NULL; + kfree(private); + return PTR_ERR(block); + } + device->block = block; + block->base = device; + + /* Read Device Characteristics */ + rdc_data = &private->rdc_data; + rdc_data->dev_nr = private->dev_id.devno; + rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); + + rc = diag210((struct diag210 *) rdc_data); + if (rc) { + DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device " + "information (rc=%d)", rc); + rc = -EOPNOTSUPP; + goto out; + } + + device->default_expires = DIAG_TIMEOUT; + device->default_retries = DIAG_MAX_RETRIES; + + /* Figure out position of label block */ + switch (private->rdc_data.vdev_class) { + case DEV_CLASS_FBA: + private->pt_block = 1; + break; + case DEV_CLASS_ECKD: + private->pt_block = 2; + break; + default: + pr_warn("%s: Device type %d is not supported in DIAG mode\n", + dev_name(&device->cdev->dev), + private->rdc_data.vdev_class); + rc = -EOPNOTSUPP; + goto out; + } + + DBF_DEV_EVENT(DBF_INFO, device, + "%04X: %04X on real %04X/%02X", + rdc_data->dev_nr, + rdc_data->vdev_type, + rdc_data->rdev_type, rdc_data->rdev_model); + + /* terminate all outstanding operations */ + mdsk_term_io(device); + + /* figure out blocksize of device */ + label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); + if (label == NULL) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "No memory to allocate initialization request"); + rc = -ENOMEM; + goto out; + } + rc = 0; + end_block = 0; + /* try all sizes - needed for ECKD devices */ + for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { + mdsk_init_io(device, bsize, 0, &end_block); + memset(&bio, 0, sizeof (struct dasd_diag_bio)); + bio.type = MDSK_READ_REQ; + bio.block_number = private->pt_block + 1; + bio.buffer = label; + memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); + private->iob.dev_nr = rdc_data->dev_nr; + private->iob.key = 0; + private->iob.flags = 0; /* do synchronous io */ + private->iob.block_count = 1; + private->iob.interrupt_params = 0; + private->iob.bio_list = &bio; + private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; + rc = dia250(&private->iob, RW_BIO); + if (rc == 3) { + pr_warn("%s: A 64-bit DIAG call failed\n", + dev_name(&device->cdev->dev)); + rc = -EOPNOTSUPP; + goto out_label; + } + mdsk_term_io(device); + if (rc == 0) + break; + } + if (bsize > PAGE_SIZE) { + pr_warn("%s: Accessing the DASD failed because of an incorrect format (rc=%d)\n", + dev_name(&device->cdev->dev), rc); + rc = -EIO; + goto out_label; + } + /* check for label block */ + if (memcmp(label->label_id, DASD_DIAG_CMS1, + sizeof(DASD_DIAG_CMS1)) == 0) { + /* get formatted blocksize from label block */ + bsize = (unsigned int) label->block_size; + block->blocks = (unsigned long) label->block_count; + } else + block->blocks = end_block; + block->bp_block = bsize; + block->s2b_shift = 0; /* bits to shift 512 to get a block */ + for (sb = 512; sb < bsize; sb = sb << 1) + block->s2b_shift++; + rc = mdsk_init_io(device, block->bp_block, 0, NULL); + if (rc && (rc != 4)) { + pr_warn("%s: DIAG initialization failed with rc=%d\n", + dev_name(&device->cdev->dev), rc); + rc = -EIO; + } else { + if (rc == 4) + set_bit(DASD_FLAG_DEVICE_RO, &device->flags); + pr_info("%s: New DASD with %ld byte/block, total size %ld " + "KB%s\n", dev_name(&device->cdev->dev), + (unsigned long) block->bp_block, + (unsigned long) (block->blocks << + block->s2b_shift) >> 1, + (rc == 4) ? ", read-only device" : ""); + rc = 0; + } +out_label: + free_page((long) label); +out: + if (rc) { + device->block = NULL; + dasd_free_block(block); + device->private = NULL; + kfree(private); + } + return rc; +} + +/* Fill in virtual disk geometry for device. Return zero on success, non-zero + * otherwise. */ +static int +dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) +{ + if (dasd_check_blocksize(block->bp_block) != 0) + return -EINVAL; + geo->cylinders = (block->blocks << block->s2b_shift) >> 10; + geo->heads = 16; + geo->sectors = 128 >> block->s2b_shift; + return 0; +} + +static dasd_erp_fn_t +dasd_diag_erp_action(struct dasd_ccw_req * cqr) +{ + return dasd_default_erp_action; +} + +static dasd_erp_fn_t +dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) +{ + return dasd_default_erp_postaction; +} + +/* Create DASD request from block device request. Return pointer to new + * request on success, ERR_PTR otherwise. */ +static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, + struct dasd_block *block, + struct request *req) +{ + struct dasd_ccw_req *cqr; + struct dasd_diag_req *dreq; + struct dasd_diag_bio *dbio; + struct req_iterator iter; + struct bio_vec bv; + char *dst; + unsigned int count, datasize; + sector_t recid, first_rec, last_rec; + unsigned int blksize, off; + unsigned char rw_cmd; + + if (rq_data_dir(req) == READ) + rw_cmd = MDSK_READ_REQ; + else if (rq_data_dir(req) == WRITE) + rw_cmd = MDSK_WRITE_REQ; + else + return ERR_PTR(-EINVAL); + blksize = block->bp_block; + /* Calculate record id of first and last block. */ + first_rec = blk_rq_pos(req) >> block->s2b_shift; + last_rec = + (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; + /* Check struct bio and count the number of blocks for the request. */ + count = 0; + rq_for_each_segment(bv, req, iter) { + if (bv.bv_len & (blksize - 1)) + /* Fba can only do full blocks. */ + return ERR_PTR(-EINVAL); + count += bv.bv_len >> (block->s2b_shift + 9); + } + /* Paranoia. */ + if (count != last_rec - first_rec + 1) + return ERR_PTR(-EINVAL); + /* Build the request */ + datasize = sizeof(struct dasd_diag_req) + + count*sizeof(struct dasd_diag_bio); + cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev, + blk_mq_rq_to_pdu(req)); + if (IS_ERR(cqr)) + return cqr; + + dreq = (struct dasd_diag_req *) cqr->data; + dreq->block_count = count; + dbio = dreq->bio; + recid = first_rec; + rq_for_each_segment(bv, req, iter) { + dst = page_address(bv.bv_page) + bv.bv_offset; + for (off = 0; off < bv.bv_len; off += blksize) { + memset(dbio, 0, sizeof (struct dasd_diag_bio)); + dbio->type = rw_cmd; + dbio->block_number = recid + 1; + dbio->buffer = dst; + dbio++; + dst += blksize; + recid++; + } + } + cqr->retries = memdev->default_retries; + cqr->buildclk = get_tod_clock(); + if (blk_noretry_request(req) || + block->base->features & DASD_FEATURE_FAILFAST) + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + cqr->startdev = memdev; + cqr->memdev = memdev; + cqr->block = block; + cqr->expires = memdev->default_expires * HZ; + cqr->status = DASD_CQR_FILLED; + return cqr; +} + +/* Release DASD request. Return non-zero if request was successful, zero + * otherwise. */ +static int +dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) +{ + int status; + + status = cqr->status == DASD_CQR_DONE; + dasd_sfree_request(cqr, cqr->memdev); + return status; +} + +static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr) +{ + if (cqr->retries < 0) + cqr->status = DASD_CQR_FAILED; + else + cqr->status = DASD_CQR_FILLED; +}; + +/* Fill in IOCTL data for device. */ +static int +dasd_diag_fill_info(struct dasd_device * device, + struct dasd_information2_t * info) +{ + struct dasd_diag_private *private = device->private; + + info->label_block = (unsigned int) private->pt_block; + info->FBA_layout = 1; + info->format = DASD_FORMAT_LDL; + info->characteristics_size = sizeof(private->rdc_data); + memcpy(info->characteristics, &private->rdc_data, + sizeof(private->rdc_data)); + info->confdata_size = 0; + return 0; +} + +static void +dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, + struct irb *stat) +{ + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "dump sense not available for DIAG data"); +} + +static struct dasd_discipline dasd_diag_discipline = { + .owner = THIS_MODULE, + .name = "DIAG", + .ebcname = "DIAG", + .max_blocks = DIAG_MAX_BLOCKS, + .check_device = dasd_diag_check_device, + .verify_path = dasd_generic_verify_path, + .fill_geometry = dasd_diag_fill_geometry, + .start_IO = dasd_start_diag, + .term_IO = dasd_diag_term_IO, + .handle_terminated_request = dasd_diag_handle_terminated_request, + .erp_action = dasd_diag_erp_action, + .erp_postaction = dasd_diag_erp_postaction, + .build_cp = dasd_diag_build_cp, + .free_cp = dasd_diag_free_cp, + .dump_sense = dasd_diag_dump_sense, + .fill_info = dasd_diag_fill_info, +}; + +static int __init +dasd_diag_init(void) +{ + if (!MACHINE_IS_VM) { + pr_info("Discipline %s cannot be used without z/VM\n", + dasd_diag_discipline.name); + return -ENODEV; + } + ASCEBC(dasd_diag_discipline.ebcname, 4); + + irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); + register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); + dasd_diag_discipline_pointer = &dasd_diag_discipline; + return 0; +} + +static void __exit +dasd_diag_cleanup(void) +{ + unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); + irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL); + dasd_diag_discipline_pointer = NULL; +} + +module_init(dasd_diag_init); +module_exit(dasd_diag_cleanup); diff --git a/drivers/s390/block/dasd_diag.h b/drivers/s390/block/dasd_diag.h new file mode 100644 index 000000000..405b6feed --- /dev/null +++ b/drivers/s390/block/dasd_diag.h @@ -0,0 +1,81 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Author(s)......: Holger Smolinski + * Based on.......: linux/drivers/s390/block/mdisk.h + * ...............: by Hartmunt Penner + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2000 + * + */ + +#define MDSK_WRITE_REQ 0x01 +#define MDSK_READ_REQ 0x02 + +#define INIT_BIO 0x00 +#define RW_BIO 0x01 +#define TERM_BIO 0x02 + +#define DEV_CLASS_FBA 0x01 +#define DEV_CLASS_ECKD 0x04 + +#define DASD_DIAG_CODE_31BIT 0x03 +#define DASD_DIAG_CODE_64BIT 0x07 + +#define DASD_DIAG_RWFLAG_ASYNC 0x02 +#define DASD_DIAG_RWFLAG_NOCACHE 0x01 + +#define DASD_DIAG_FLAGA_FORMAT_64BIT 0x80 + +struct dasd_diag_characteristics { + u16 dev_nr; + u16 rdc_len; + u8 vdev_class; + u8 vdev_type; + u8 vdev_status; + u8 vdev_flags; + u8 rdev_class; + u8 rdev_type; + u8 rdev_model; + u8 rdev_features; +} __attribute__ ((packed, aligned(4))); + +#define DASD_DIAG_FLAGA_DEFAULT DASD_DIAG_FLAGA_FORMAT_64BIT + +typedef u64 blocknum_t; +typedef s64 sblocknum_t; + +struct dasd_diag_bio { + u8 type; + u8 status; + u8 spare1[2]; + u32 alet; + blocknum_t block_number; + void *buffer; +} __attribute__ ((packed, aligned(8))); + +struct dasd_diag_init_io { + u16 dev_nr; + u8 flaga; + u8 spare1[21]; + u32 block_size; + u8 spare2[4]; + blocknum_t offset; + sblocknum_t start_block; + blocknum_t end_block; + u8 spare3[8]; +} __attribute__ ((packed, aligned(8))); + +struct dasd_diag_rw_io { + u16 dev_nr; + u8 flaga; + u8 spare1[21]; + u8 key; + u8 flags; + u8 spare2[2]; + u32 block_count; + u32 alet; + u8 spare3[4]; + u64 interrupt_params; + struct dasd_diag_bio *bio_list; + u8 spare4[8]; +} __attribute__ ((packed, aligned(8))); diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c new file mode 100644 index 000000000..a2e34c853 --- /dev/null +++ b/drivers/s390/block/dasd_eckd.c @@ -0,0 +1,5840 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Holger Smolinski + * Horst Hummel + * Carsten Otte + * Martin Schwidefsky + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2009 + * EMC Symmetrix ioctl Copyright EMC Corporation, 2008 + * Author.........: Nigel Hislop + */ + +#define KMSG_COMPONENT "dasd-eckd" + +#include +#include +#include +#include /* HDIO_GETGEO */ +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "dasd_int.h" +#include "dasd_eckd.h" + +#ifdef PRINTK_HEADER +#undef PRINTK_HEADER +#endif /* PRINTK_HEADER */ +#define PRINTK_HEADER "dasd(eckd):" + +#define ECKD_C0(i) (i->home_bytes) +#define ECKD_F(i) (i->formula) +#define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\ + (i->factors.f_0x02.f1)) +#define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\ + (i->factors.f_0x02.f2)) +#define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\ + (i->factors.f_0x02.f3)) +#define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0) +#define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0) +#define ECKD_F6(i) (i->factor6) +#define ECKD_F7(i) (i->factor7) +#define ECKD_F8(i) (i->factor8) + +/* + * raw track access always map to 64k in memory + * so it maps to 16 blocks of 4k per track + */ +#define DASD_RAW_BLOCK_PER_TRACK 16 +#define DASD_RAW_BLOCKSIZE 4096 +/* 64k are 128 x 512 byte sectors */ +#define DASD_RAW_SECTORS_PER_TRACK 128 + +MODULE_LICENSE("GPL"); + +static struct dasd_discipline dasd_eckd_discipline; + +/* The ccw bus type uses this table to find devices that it sends to + * dasd_eckd_probe */ +static struct ccw_device_id dasd_eckd_ids[] = { + { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1}, + { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2}, + { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3}, + { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4}, + { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5}, + { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6}, + { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7}, + { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8}, + { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9}, + { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa}, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids); + +static struct ccw_driver dasd_eckd_driver; /* see below */ + +static void *rawpadpage; + +#define INIT_CQR_OK 0 +#define INIT_CQR_UNFORMATTED 1 +#define INIT_CQR_ERROR 2 + +/* emergency request for reserve/release */ +static struct { + struct dasd_ccw_req cqr; + struct ccw1 ccw; + char data[32]; +} *dasd_reserve_req; +static DEFINE_MUTEX(dasd_reserve_mutex); + +/* definitions for the path verification worker */ +struct path_verification_work_data { + struct work_struct worker; + struct dasd_device *device; + struct dasd_ccw_req cqr; + struct ccw1 ccw; + __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE]; + int isglobal; + __u8 tbvpm; +}; +static struct path_verification_work_data *path_verification_worker; +static DEFINE_MUTEX(dasd_path_verification_mutex); + +struct check_attention_work_data { + struct work_struct worker; + struct dasd_device *device; + __u8 lpum; +}; + +static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int, + struct dasd_device *, struct dasd_device *, + unsigned int, int, unsigned int, unsigned int, + unsigned int, unsigned int); + +/* initial attempt at a probe function. this can be simplified once + * the other detection code is gone */ +static int +dasd_eckd_probe (struct ccw_device *cdev) +{ + int ret; + + /* set ECKD specific ccw-device options */ + ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE | + CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH); + if (ret) { + DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", + "dasd_eckd_probe: could not set " + "ccw-device options"); + return ret; + } + ret = dasd_generic_probe(cdev, &dasd_eckd_discipline); + return ret; +} + +static int +dasd_eckd_set_online(struct ccw_device *cdev) +{ + return dasd_generic_set_online(cdev, &dasd_eckd_discipline); +} + +static const int sizes_trk0[] = { 28, 148, 84 }; +#define LABEL_SIZE 140 + +/* head and record addresses of count_area read in analysis ccw */ +static const int count_area_head[] = { 0, 0, 0, 0, 2 }; +static const int count_area_rec[] = { 1, 2, 3, 4, 1 }; + +static inline unsigned int +round_up_multiple(unsigned int no, unsigned int mult) +{ + int rem = no % mult; + return (rem ? no - rem + mult : no); +} + +static inline unsigned int +ceil_quot(unsigned int d1, unsigned int d2) +{ + return (d1 + (d2 - 1)) / d2; +} + +static unsigned int +recs_per_track(struct dasd_eckd_characteristics * rdc, + unsigned int kl, unsigned int dl) +{ + int dn, kn; + + switch (rdc->dev_type) { + case 0x3380: + if (kl) + return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) + + ceil_quot(dl + 12, 32)); + else + return 1499 / (15 + ceil_quot(dl + 12, 32)); + case 0x3390: + dn = ceil_quot(dl + 6, 232) + 1; + if (kl) { + kn = ceil_quot(kl + 6, 232) + 1; + return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) + + 9 + ceil_quot(dl + 6 * dn, 34)); + } else + return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34)); + case 0x9345: + dn = ceil_quot(dl + 6, 232) + 1; + if (kl) { + kn = ceil_quot(kl + 6, 232) + 1; + return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) + + ceil_quot(dl + 6 * dn, 34)); + } else + return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34)); + } + return 0; +} + +static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head) +{ + geo->cyl = (__u16) cyl; + geo->head = cyl >> 16; + geo->head <<= 4; + geo->head |= head; +} + +static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data, + struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + int rc; + + rc = get_phys_clock(&data->ep_sys_time); + /* + * Ignore return code if XRC is not supported or + * sync clock is switched off + */ + if ((rc && !private->rdc_data.facilities.XRC_supported) || + rc == -EOPNOTSUPP || rc == -EACCES) + return 0; + + /* switch on System Time Stamp - needed for XRC Support */ + data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */ + data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */ + + if (ccw) { + ccw->count = sizeof(struct DE_eckd_data); + ccw->flags |= CCW_FLAG_SLI; + } + + return rc; +} + +static int +define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk, + unsigned int totrk, int cmd, struct dasd_device *device, + int blksize) +{ + struct dasd_eckd_private *private = device->private; + u16 heads, beghead, endhead; + u32 begcyl, endcyl; + int rc = 0; + + if (ccw) { + ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT; + ccw->flags = 0; + ccw->count = 16; + ccw->cda = (__u32)__pa(data); + } + + memset(data, 0, sizeof(struct DE_eckd_data)); + switch (cmd) { + case DASD_ECKD_CCW_READ_HOME_ADDRESS: + case DASD_ECKD_CCW_READ_RECORD_ZERO: + case DASD_ECKD_CCW_READ: + case DASD_ECKD_CCW_READ_MT: + case DASD_ECKD_CCW_READ_CKD: + case DASD_ECKD_CCW_READ_CKD_MT: + case DASD_ECKD_CCW_READ_KD: + case DASD_ECKD_CCW_READ_KD_MT: + data->mask.perm = 0x1; + data->attributes.operation = private->attrib.operation; + break; + case DASD_ECKD_CCW_READ_COUNT: + data->mask.perm = 0x1; + data->attributes.operation = DASD_BYPASS_CACHE; + break; + case DASD_ECKD_CCW_READ_TRACK: + case DASD_ECKD_CCW_READ_TRACK_DATA: + data->mask.perm = 0x1; + data->attributes.operation = private->attrib.operation; + data->blk_size = 0; + break; + case DASD_ECKD_CCW_WRITE: + case DASD_ECKD_CCW_WRITE_MT: + case DASD_ECKD_CCW_WRITE_KD: + case DASD_ECKD_CCW_WRITE_KD_MT: + data->mask.perm = 0x02; + data->attributes.operation = private->attrib.operation; + rc = set_timestamp(ccw, data, device); + break; + case DASD_ECKD_CCW_WRITE_CKD: + case DASD_ECKD_CCW_WRITE_CKD_MT: + data->attributes.operation = DASD_BYPASS_CACHE; + rc = set_timestamp(ccw, data, device); + break; + case DASD_ECKD_CCW_ERASE: + case DASD_ECKD_CCW_WRITE_HOME_ADDRESS: + case DASD_ECKD_CCW_WRITE_RECORD_ZERO: + data->mask.perm = 0x3; + data->mask.auth = 0x1; + data->attributes.operation = DASD_BYPASS_CACHE; + rc = set_timestamp(ccw, data, device); + break; + case DASD_ECKD_CCW_WRITE_FULL_TRACK: + data->mask.perm = 0x03; + data->attributes.operation = private->attrib.operation; + data->blk_size = 0; + break; + case DASD_ECKD_CCW_WRITE_TRACK_DATA: + data->mask.perm = 0x02; + data->attributes.operation = private->attrib.operation; + data->blk_size = blksize; + rc = set_timestamp(ccw, data, device); + break; + default: + dev_err(&device->cdev->dev, + "0x%x is not a known command\n", cmd); + break; + } + + data->attributes.mode = 0x3; /* ECKD */ + + if ((private->rdc_data.cu_type == 0x2105 || + private->rdc_data.cu_type == 0x2107 || + private->rdc_data.cu_type == 0x1750) + && !(private->uses_cdl && trk < 2)) + data->ga_extended |= 0x40; /* Regular Data Format Mode */ + + heads = private->rdc_data.trk_per_cyl; + begcyl = trk / heads; + beghead = trk % heads; + endcyl = totrk / heads; + endhead = totrk % heads; + + /* check for sequential prestage - enhance cylinder range */ + if (data->attributes.operation == DASD_SEQ_PRESTAGE || + data->attributes.operation == DASD_SEQ_ACCESS) { + + if (endcyl + private->attrib.nr_cyl < private->real_cyl) + endcyl += private->attrib.nr_cyl; + else + endcyl = (private->real_cyl - 1); + } + + set_ch_t(&data->beg_ext, begcyl, beghead); + set_ch_t(&data->end_ext, endcyl, endhead); + return rc; +} + + +static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data, + unsigned int trk, unsigned int rec_on_trk, + int count, int cmd, struct dasd_device *device, + unsigned int reclen, unsigned int tlf) +{ + struct dasd_eckd_private *private = device->private; + int sector; + int dn, d; + + if (ccw) { + ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT; + ccw->flags = 0; + if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) + ccw->count = 22; + else + ccw->count = 20; + ccw->cda = (__u32)__pa(data); + } + + memset(data, 0, sizeof(*data)); + sector = 0; + if (rec_on_trk) { + switch (private->rdc_data.dev_type) { + case 0x3390: + dn = ceil_quot(reclen + 6, 232); + d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34); + sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8; + break; + case 0x3380: + d = 7 + ceil_quot(reclen + 12, 32); + sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7; + break; + } + } + data->sector = sector; + /* note: meaning of count depends on the operation + * for record based I/O it's the number of records, but for + * track based I/O it's the number of tracks + */ + data->count = count; + switch (cmd) { + case DASD_ECKD_CCW_WRITE_HOME_ADDRESS: + data->operation.orientation = 0x3; + data->operation.operation = 0x03; + break; + case DASD_ECKD_CCW_READ_HOME_ADDRESS: + data->operation.orientation = 0x3; + data->operation.operation = 0x16; + break; + case DASD_ECKD_CCW_WRITE_RECORD_ZERO: + data->operation.orientation = 0x1; + data->operation.operation = 0x03; + data->count++; + break; + case DASD_ECKD_CCW_READ_RECORD_ZERO: + data->operation.orientation = 0x3; + data->operation.operation = 0x16; + data->count++; + break; + case DASD_ECKD_CCW_WRITE: + case DASD_ECKD_CCW_WRITE_MT: + case DASD_ECKD_CCW_WRITE_KD: + case DASD_ECKD_CCW_WRITE_KD_MT: + data->auxiliary.length_valid = 0x1; + data->length = reclen; + data->operation.operation = 0x01; + break; + case DASD_ECKD_CCW_WRITE_CKD: + case DASD_ECKD_CCW_WRITE_CKD_MT: + data->auxiliary.length_valid = 0x1; + data->length = reclen; + data->operation.operation = 0x03; + break; + case DASD_ECKD_CCW_WRITE_FULL_TRACK: + data->operation.orientation = 0x0; + data->operation.operation = 0x3F; + data->extended_operation = 0x11; + data->length = 0; + data->extended_parameter_length = 0x02; + if (data->count > 8) { + data->extended_parameter[0] = 0xFF; + data->extended_parameter[1] = 0xFF; + data->extended_parameter[1] <<= (16 - count); + } else { + data->extended_parameter[0] = 0xFF; + data->extended_parameter[0] <<= (8 - count); + data->extended_parameter[1] = 0x00; + } + data->sector = 0xFF; + break; + case DASD_ECKD_CCW_WRITE_TRACK_DATA: + data->auxiliary.length_valid = 0x1; + data->length = reclen; /* not tlf, as one might think */ + data->operation.operation = 0x3F; + data->extended_operation = 0x23; + break; + case DASD_ECKD_CCW_READ: + case DASD_ECKD_CCW_READ_MT: + case DASD_ECKD_CCW_READ_KD: + case DASD_ECKD_CCW_READ_KD_MT: + data->auxiliary.length_valid = 0x1; + data->length = reclen; + data->operation.operation = 0x06; + break; + case DASD_ECKD_CCW_READ_CKD: + case DASD_ECKD_CCW_READ_CKD_MT: + data->auxiliary.length_valid = 0x1; + data->length = reclen; + data->operation.operation = 0x16; + break; + case DASD_ECKD_CCW_READ_COUNT: + data->operation.operation = 0x06; + break; + case DASD_ECKD_CCW_READ_TRACK: + data->operation.orientation = 0x1; + data->operation.operation = 0x0C; + data->extended_parameter_length = 0; + data->sector = 0xFF; + break; + case DASD_ECKD_CCW_READ_TRACK_DATA: + data->auxiliary.length_valid = 0x1; + data->length = tlf; + data->operation.operation = 0x0C; + break; + case DASD_ECKD_CCW_ERASE: + data->length = reclen; + data->auxiliary.length_valid = 0x1; + data->operation.operation = 0x0b; + break; + default: + DBF_DEV_EVENT(DBF_ERR, device, + "fill LRE unknown opcode 0x%x", cmd); + BUG(); + } + set_ch_t(&data->seek_addr, + trk / private->rdc_data.trk_per_cyl, + trk % private->rdc_data.trk_per_cyl); + data->search_arg.cyl = data->seek_addr.cyl; + data->search_arg.head = data->seek_addr.head; + data->search_arg.record = rec_on_trk; +} + +static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, + unsigned int trk, unsigned int totrk, int cmd, + struct dasd_device *basedev, struct dasd_device *startdev, + unsigned int format, unsigned int rec_on_trk, int count, + unsigned int blksize, unsigned int tlf) +{ + struct dasd_eckd_private *basepriv, *startpriv; + struct LRE_eckd_data *lredata; + struct DE_eckd_data *dedata; + int rc = 0; + + basepriv = basedev->private; + startpriv = startdev->private; + dedata = &pfxdata->define_extent; + lredata = &pfxdata->locate_record; + + ccw->cmd_code = DASD_ECKD_CCW_PFX; + ccw->flags = 0; + if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) { + ccw->count = sizeof(*pfxdata) + 2; + ccw->cda = (__u32) __pa(pfxdata); + memset(pfxdata, 0, sizeof(*pfxdata) + 2); + } else { + ccw->count = sizeof(*pfxdata); + ccw->cda = (__u32) __pa(pfxdata); + memset(pfxdata, 0, sizeof(*pfxdata)); + } + + /* prefix data */ + if (format > 1) { + DBF_DEV_EVENT(DBF_ERR, basedev, + "PFX LRE unknown format 0x%x", format); + BUG(); + return -EINVAL; + } + pfxdata->format = format; + pfxdata->base_address = basepriv->ned->unit_addr; + pfxdata->base_lss = basepriv->ned->ID; + pfxdata->validity.define_extent = 1; + + /* private uid is kept up to date, conf_data may be outdated */ + if (startpriv->uid.type == UA_BASE_PAV_ALIAS) + pfxdata->validity.verify_base = 1; + + if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) { + pfxdata->validity.verify_base = 1; + pfxdata->validity.hyper_pav = 1; + } + + rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize); + + /* + * For some commands the System Time Stamp is set in the define extent + * data when XRC is supported. The validity of the time stamp must be + * reflected in the prefix data as well. + */ + if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02) + pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */ + + if (format == 1) { + locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd, + basedev, blksize, tlf); + } + + return rc; +} + +static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, + unsigned int trk, unsigned int totrk, int cmd, + struct dasd_device *basedev, struct dasd_device *startdev) +{ + return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev, + 0, 0, 0, 0, 0); +} + +static void +locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk, + unsigned int rec_on_trk, int no_rec, int cmd, + struct dasd_device * device, int reclen) +{ + struct dasd_eckd_private *private = device->private; + int sector; + int dn, d; + + DBF_DEV_EVENT(DBF_INFO, device, + "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d", + trk, rec_on_trk, no_rec, cmd, reclen); + + ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD; + ccw->flags = 0; + ccw->count = 16; + ccw->cda = (__u32) __pa(data); + + memset(data, 0, sizeof(struct LO_eckd_data)); + sector = 0; + if (rec_on_trk) { + switch (private->rdc_data.dev_type) { + case 0x3390: + dn = ceil_quot(reclen + 6, 232); + d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34); + sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8; + break; + case 0x3380: + d = 7 + ceil_quot(reclen + 12, 32); + sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7; + break; + } + } + data->sector = sector; + data->count = no_rec; + switch (cmd) { + case DASD_ECKD_CCW_WRITE_HOME_ADDRESS: + data->operation.orientation = 0x3; + data->operation.operation = 0x03; + break; + case DASD_ECKD_CCW_READ_HOME_ADDRESS: + data->operation.orientation = 0x3; + data->operation.operation = 0x16; + break; + case DASD_ECKD_CCW_WRITE_RECORD_ZERO: + data->operation.orientation = 0x1; + data->operation.operation = 0x03; + data->count++; + break; + case DASD_ECKD_CCW_READ_RECORD_ZERO: + data->operation.orientation = 0x3; + data->operation.operation = 0x16; + data->count++; + break; + case DASD_ECKD_CCW_WRITE: + case DASD_ECKD_CCW_WRITE_MT: + case DASD_ECKD_CCW_WRITE_KD: + case DASD_ECKD_CCW_WRITE_KD_MT: + data->auxiliary.last_bytes_used = 0x1; + data->length = reclen; + data->operation.operation = 0x01; + break; + case DASD_ECKD_CCW_WRITE_CKD: + case DASD_ECKD_CCW_WRITE_CKD_MT: + data->auxiliary.last_bytes_used = 0x1; + data->length = reclen; + data->operation.operation = 0x03; + break; + case DASD_ECKD_CCW_READ: + case DASD_ECKD_CCW_READ_MT: + case DASD_ECKD_CCW_READ_KD: + case DASD_ECKD_CCW_READ_KD_MT: + data->auxiliary.last_bytes_used = 0x1; + data->length = reclen; + data->operation.operation = 0x06; + break; + case DASD_ECKD_CCW_READ_CKD: + case DASD_ECKD_CCW_READ_CKD_MT: + data->auxiliary.last_bytes_used = 0x1; + data->length = reclen; + data->operation.operation = 0x16; + break; + case DASD_ECKD_CCW_READ_COUNT: + data->operation.operation = 0x06; + break; + case DASD_ECKD_CCW_ERASE: + data->length = reclen; + data->auxiliary.last_bytes_used = 0x1; + data->operation.operation = 0x0b; + break; + default: + DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record " + "opcode 0x%x", cmd); + } + set_ch_t(&data->seek_addr, + trk / private->rdc_data.trk_per_cyl, + trk % private->rdc_data.trk_per_cyl); + data->search_arg.cyl = data->seek_addr.cyl; + data->search_arg.head = data->seek_addr.head; + data->search_arg.record = rec_on_trk; +} + +/* + * Returns 1 if the block is one of the special blocks that needs + * to get read/written with the KD variant of the command. + * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and + * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT. + * Luckily the KD variants differ only by one bit (0x08) from the + * normal variant. So don't wonder about code like: + * if (dasd_eckd_cdl_special(blk_per_trk, recid)) + * ccw->cmd_code |= 0x8; + */ +static inline int +dasd_eckd_cdl_special(int blk_per_trk, int recid) +{ + if (recid < 3) + return 1; + if (recid < blk_per_trk) + return 0; + if (recid < 2 * blk_per_trk) + return 1; + return 0; +} + +/* + * Returns the record size for the special blocks of the cdl format. + * Only returns something useful if dasd_eckd_cdl_special is true + * for the recid. + */ +static inline int +dasd_eckd_cdl_reclen(int recid) +{ + if (recid < 3) + return sizes_trk0[recid]; + return LABEL_SIZE; +} +/* create unique id from private structure. */ +static void create_uid(struct dasd_eckd_private *private) +{ + int count; + struct dasd_uid *uid; + + uid = &private->uid; + memset(uid, 0, sizeof(struct dasd_uid)); + memcpy(uid->vendor, private->ned->HDA_manufacturer, + sizeof(uid->vendor) - 1); + EBCASC(uid->vendor, sizeof(uid->vendor) - 1); + memcpy(uid->serial, private->ned->HDA_location, + sizeof(uid->serial) - 1); + EBCASC(uid->serial, sizeof(uid->serial) - 1); + uid->ssid = private->gneq->subsystemID; + uid->real_unit_addr = private->ned->unit_addr; + if (private->sneq) { + uid->type = private->sneq->sua_flags; + if (uid->type == UA_BASE_PAV_ALIAS) + uid->base_unit_addr = private->sneq->base_unit_addr; + } else { + uid->type = UA_BASE_DEVICE; + } + if (private->vdsneq) { + for (count = 0; count < 16; count++) { + sprintf(uid->vduit+2*count, "%02x", + private->vdsneq->uit[count]); + } + } +} + +/* + * Generate device unique id that specifies the physical device. + */ +static int dasd_eckd_generate_uid(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + unsigned long flags; + + if (!private) + return -ENODEV; + if (!private->ned || !private->gneq) + return -ENODEV; + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + create_uid(private); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + return 0; +} + +static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid) +{ + struct dasd_eckd_private *private = device->private; + unsigned long flags; + + if (private) { + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + *uid = private->uid; + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + return 0; + } + return -EINVAL; +} + +/* + * compare device UID with data of a given dasd_eckd_private structure + * return 0 for match + */ +static int dasd_eckd_compare_path_uid(struct dasd_device *device, + struct dasd_eckd_private *private) +{ + struct dasd_uid device_uid; + + create_uid(private); + dasd_eckd_get_uid(device, &device_uid); + + return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid)); +} + +static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device, + struct dasd_ccw_req *cqr, + __u8 *rcd_buffer, + __u8 lpm) +{ + struct ccw1 *ccw; + /* + * buffer has to start with EBCDIC "V1.0" to show + * support for virtual device SNEQ + */ + rcd_buffer[0] = 0xE5; + rcd_buffer[1] = 0xF1; + rcd_buffer[2] = 0x4B; + rcd_buffer[3] = 0xF0; + + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_RCD; + ccw->flags = 0; + ccw->cda = (__u32)(addr_t)rcd_buffer; + ccw->count = DASD_ECKD_RCD_DATA_SIZE; + cqr->magic = DASD_ECKD_MAGIC; + + cqr->startdev = device; + cqr->memdev = device; + cqr->block = NULL; + cqr->expires = 10*HZ; + cqr->lpm = lpm; + cqr->retries = 256; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags); +} + +/* + * Wakeup helper for read_conf + * if the cqr is not done and needs some error recovery + * the buffer has to be re-initialized with the EBCDIC "V1.0" + * to show support for virtual device SNEQ + */ +static void read_conf_cb(struct dasd_ccw_req *cqr, void *data) +{ + struct ccw1 *ccw; + __u8 *rcd_buffer; + + if (cqr->status != DASD_CQR_DONE) { + ccw = cqr->cpaddr; + rcd_buffer = (__u8 *)((addr_t) ccw->cda); + memset(rcd_buffer, 0, sizeof(*rcd_buffer)); + + rcd_buffer[0] = 0xE5; + rcd_buffer[1] = 0xF1; + rcd_buffer[2] = 0x4B; + rcd_buffer[3] = 0xF0; + } + dasd_wakeup_cb(cqr, data); +} + +static int dasd_eckd_read_conf_immediately(struct dasd_device *device, + struct dasd_ccw_req *cqr, + __u8 *rcd_buffer, + __u8 lpm) +{ + struct ciw *ciw; + int rc; + /* + * sanity check: scan for RCD command in extended SenseID data + * some devices do not support RCD + */ + ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD); + if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) + return -EOPNOTSUPP; + + dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm); + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags); + cqr->retries = 5; + cqr->callback = read_conf_cb; + rc = dasd_sleep_on_immediatly(cqr); + return rc; +} + +static int dasd_eckd_read_conf_lpm(struct dasd_device *device, + void **rcd_buffer, + int *rcd_buffer_size, __u8 lpm) +{ + struct ciw *ciw; + char *rcd_buf = NULL; + int ret; + struct dasd_ccw_req *cqr; + + /* + * sanity check: scan for RCD command in extended SenseID data + * some devices do not support RCD + */ + ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD); + if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) { + ret = -EOPNOTSUPP; + goto out_error; + } + rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA); + if (!rcd_buf) { + ret = -ENOMEM; + goto out_error; + } + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */, + 0, /* use rcd_buf as data ara */ + device, NULL); + if (IS_ERR(cqr)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Could not allocate RCD request"); + ret = -ENOMEM; + goto out_error; + } + dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm); + cqr->callback = read_conf_cb; + ret = dasd_sleep_on(cqr); + /* + * on success we update the user input parms + */ + dasd_sfree_request(cqr, cqr->memdev); + if (ret) + goto out_error; + + *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE; + *rcd_buffer = rcd_buf; + return 0; +out_error: + kfree(rcd_buf); + *rcd_buffer = NULL; + *rcd_buffer_size = 0; + return ret; +} + +static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private) +{ + + struct dasd_sneq *sneq; + int i, count; + + private->ned = NULL; + private->sneq = NULL; + private->vdsneq = NULL; + private->gneq = NULL; + count = private->conf_len / sizeof(struct dasd_sneq); + sneq = (struct dasd_sneq *)private->conf_data; + for (i = 0; i < count; ++i) { + if (sneq->flags.identifier == 1 && sneq->format == 1) + private->sneq = sneq; + else if (sneq->flags.identifier == 1 && sneq->format == 4) + private->vdsneq = (struct vd_sneq *)sneq; + else if (sneq->flags.identifier == 2) + private->gneq = (struct dasd_gneq *)sneq; + else if (sneq->flags.identifier == 3 && sneq->res1 == 1) + private->ned = (struct dasd_ned *)sneq; + sneq++; + } + if (!private->ned || !private->gneq) { + private->ned = NULL; + private->sneq = NULL; + private->vdsneq = NULL; + private->gneq = NULL; + return -EINVAL; + } + return 0; + +}; + +static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len) +{ + struct dasd_gneq *gneq; + int i, count, found; + + count = conf_len / sizeof(*gneq); + gneq = (struct dasd_gneq *)conf_data; + found = 0; + for (i = 0; i < count; ++i) { + if (gneq->flags.identifier == 2) { + found = 1; + break; + } + gneq++; + } + if (found) + return ((char *)gneq)[18] & 0x07; + else + return 0; +} + +static void dasd_eckd_clear_conf_data(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + int i; + + private->conf_data = NULL; + private->conf_len = 0; + for (i = 0; i < 8; i++) { + kfree(device->path[i].conf_data); + device->path[i].conf_data = NULL; + device->path[i].cssid = 0; + device->path[i].ssid = 0; + device->path[i].chpid = 0; + } +} + + +static int dasd_eckd_read_conf(struct dasd_device *device) +{ + void *conf_data; + int conf_len, conf_data_saved; + int rc, path_err, pos; + __u8 lpm, opm; + struct dasd_eckd_private *private, path_private; + struct dasd_uid *uid; + char print_path_uid[60], print_device_uid[60]; + struct channel_path_desc_fmt0 *chp_desc; + struct subchannel_id sch_id; + + private = device->private; + opm = ccw_device_get_path_mask(device->cdev); + ccw_device_get_schid(device->cdev, &sch_id); + conf_data_saved = 0; + path_err = 0; + /* get configuration data per operational path */ + for (lpm = 0x80; lpm; lpm>>= 1) { + if (!(lpm & opm)) + continue; + rc = dasd_eckd_read_conf_lpm(device, &conf_data, + &conf_len, lpm); + if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */ + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, + "Read configuration data returned " + "error %d", rc); + return rc; + } + if (conf_data == NULL) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", + "No configuration data " + "retrieved"); + /* no further analysis possible */ + dasd_path_add_opm(device, opm); + continue; /* no error */ + } + /* save first valid configuration data */ + if (!conf_data_saved) { + /* initially clear previously stored conf_data */ + dasd_eckd_clear_conf_data(device); + private->conf_data = conf_data; + private->conf_len = conf_len; + if (dasd_eckd_identify_conf_parts(private)) { + private->conf_data = NULL; + private->conf_len = 0; + kfree(conf_data); + continue; + } + pos = pathmask_to_pos(lpm); + /* store per path conf_data */ + device->path[pos].conf_data = conf_data; + device->path[pos].cssid = sch_id.cssid; + device->path[pos].ssid = sch_id.ssid; + chp_desc = ccw_device_get_chp_desc(device->cdev, pos); + if (chp_desc) + device->path[pos].chpid = chp_desc->chpid; + kfree(chp_desc); + /* + * build device UID that other path data + * can be compared to it + */ + dasd_eckd_generate_uid(device); + conf_data_saved++; + } else { + path_private.conf_data = conf_data; + path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE; + if (dasd_eckd_identify_conf_parts( + &path_private)) { + path_private.conf_data = NULL; + path_private.conf_len = 0; + kfree(conf_data); + continue; + } + if (dasd_eckd_compare_path_uid( + device, &path_private)) { + uid = &path_private.uid; + if (strlen(uid->vduit) > 0) + snprintf(print_path_uid, + sizeof(print_path_uid), + "%s.%s.%04x.%02x.%s", + uid->vendor, uid->serial, + uid->ssid, uid->real_unit_addr, + uid->vduit); + else + snprintf(print_path_uid, + sizeof(print_path_uid), + "%s.%s.%04x.%02x", + uid->vendor, uid->serial, + uid->ssid, + uid->real_unit_addr); + uid = &private->uid; + if (strlen(uid->vduit) > 0) + snprintf(print_device_uid, + sizeof(print_device_uid), + "%s.%s.%04x.%02x.%s", + uid->vendor, uid->serial, + uid->ssid, uid->real_unit_addr, + uid->vduit); + else + snprintf(print_device_uid, + sizeof(print_device_uid), + "%s.%s.%04x.%02x", + uid->vendor, uid->serial, + uid->ssid, + uid->real_unit_addr); + dev_err(&device->cdev->dev, + "Not all channel paths lead to " + "the same device, path %02X leads to " + "device %s instead of %s\n", lpm, + print_path_uid, print_device_uid); + path_err = -EINVAL; + dasd_path_add_cablepm(device, lpm); + continue; + } + pos = pathmask_to_pos(lpm); + /* store per path conf_data */ + device->path[pos].conf_data = conf_data; + device->path[pos].cssid = sch_id.cssid; + device->path[pos].ssid = sch_id.ssid; + chp_desc = ccw_device_get_chp_desc(device->cdev, pos); + if (chp_desc) + device->path[pos].chpid = chp_desc->chpid; + kfree(chp_desc); + path_private.conf_data = NULL; + path_private.conf_len = 0; + } + switch (dasd_eckd_path_access(conf_data, conf_len)) { + case 0x02: + dasd_path_add_nppm(device, lpm); + break; + case 0x03: + dasd_path_add_ppm(device, lpm); + break; + } + if (!dasd_path_get_opm(device)) { + dasd_path_set_opm(device, lpm); + dasd_generic_path_operational(device); + } else { + dasd_path_add_opm(device, lpm); + } + } + + return path_err; +} + +static u32 get_fcx_max_data(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + int fcx_in_css, fcx_in_gneq, fcx_in_features; + unsigned int mdc; + int tpm; + + if (dasd_nofcx) + return 0; + /* is transport mode supported? */ + fcx_in_css = css_general_characteristics.fcx; + fcx_in_gneq = private->gneq->reserved2[7] & 0x04; + fcx_in_features = private->features.feature[40] & 0x80; + tpm = fcx_in_css && fcx_in_gneq && fcx_in_features; + + if (!tpm) + return 0; + + mdc = ccw_device_get_mdc(device->cdev, 0); + if (mdc == 0) { + dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n"); + return 0; + } else { + return (u32)mdc * FCX_MAX_DATA_FACTOR; + } +} + +static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm) +{ + struct dasd_eckd_private *private = device->private; + unsigned int mdc; + u32 fcx_max_data; + + if (private->fcx_max_data) { + mdc = ccw_device_get_mdc(device->cdev, lpm); + if (mdc == 0) { + dev_warn(&device->cdev->dev, + "Detecting the maximum data size for zHPF " + "requests failed (rc=%d) for a new path %x\n", + mdc, lpm); + return mdc; + } + fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR; + if (fcx_max_data < private->fcx_max_data) { + dev_warn(&device->cdev->dev, + "The maximum data size for zHPF requests %u " + "on a new path %x is below the active maximum " + "%u\n", fcx_max_data, lpm, + private->fcx_max_data); + return -EACCES; + } + } + return 0; +} + +static int rebuild_device_uid(struct dasd_device *device, + struct path_verification_work_data *data) +{ + struct dasd_eckd_private *private = device->private; + __u8 lpm, opm = dasd_path_get_opm(device); + int rc = -ENODEV; + + for (lpm = 0x80; lpm; lpm >>= 1) { + if (!(lpm & opm)) + continue; + memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer)); + memset(&data->cqr, 0, sizeof(data->cqr)); + data->cqr.cpaddr = &data->ccw; + rc = dasd_eckd_read_conf_immediately(device, &data->cqr, + data->rcd_buffer, + lpm); + + if (rc) { + if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */ + continue; + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, + "Read configuration data " + "returned error %d", rc); + break; + } + memcpy(private->conf_data, data->rcd_buffer, + DASD_ECKD_RCD_DATA_SIZE); + if (dasd_eckd_identify_conf_parts(private)) { + rc = -ENODEV; + } else /* first valid path is enough */ + break; + } + + if (!rc) + rc = dasd_eckd_generate_uid(device); + + return rc; +} + +static void do_path_verification_work(struct work_struct *work) +{ + struct path_verification_work_data *data; + struct dasd_device *device; + struct dasd_eckd_private path_private; + struct dasd_uid *uid; + __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE]; + __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm; + unsigned long flags; + char print_uid[60]; + int rc; + + data = container_of(work, struct path_verification_work_data, worker); + device = data->device; + + /* delay path verification until device was resumed */ + if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) { + schedule_work(work); + return; + } + /* check if path verification already running and delay if so */ + if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) { + schedule_work(work); + return; + } + opm = 0; + npm = 0; + ppm = 0; + epm = 0; + hpfpm = 0; + cablepm = 0; + + for (lpm = 0x80; lpm; lpm >>= 1) { + if (!(lpm & data->tbvpm)) + continue; + memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer)); + memset(&data->cqr, 0, sizeof(data->cqr)); + data->cqr.cpaddr = &data->ccw; + rc = dasd_eckd_read_conf_immediately(device, &data->cqr, + data->rcd_buffer, + lpm); + if (!rc) { + switch (dasd_eckd_path_access(data->rcd_buffer, + DASD_ECKD_RCD_DATA_SIZE) + ) { + case 0x02: + npm |= lpm; + break; + case 0x03: + ppm |= lpm; + break; + } + opm |= lpm; + } else if (rc == -EOPNOTSUPP) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", + "path verification: No configuration " + "data retrieved"); + opm |= lpm; + } else if (rc == -EAGAIN) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", + "path verification: device is stopped," + " try again later"); + epm |= lpm; + } else { + dev_warn(&device->cdev->dev, + "Reading device feature codes failed " + "(rc=%d) for new path %x\n", rc, lpm); + continue; + } + if (verify_fcx_max_data(device, lpm)) { + opm &= ~lpm; + npm &= ~lpm; + ppm &= ~lpm; + hpfpm |= lpm; + continue; + } + + /* + * save conf_data for comparison after + * rebuild_device_uid may have changed + * the original data + */ + memcpy(&path_rcd_buf, data->rcd_buffer, + DASD_ECKD_RCD_DATA_SIZE); + path_private.conf_data = (void *) &path_rcd_buf; + path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE; + if (dasd_eckd_identify_conf_parts(&path_private)) { + path_private.conf_data = NULL; + path_private.conf_len = 0; + continue; + } + + /* + * compare path UID with device UID only if at least + * one valid path is left + * in other case the device UID may have changed and + * the first working path UID will be used as device UID + */ + if (dasd_path_get_opm(device) && + dasd_eckd_compare_path_uid(device, &path_private)) { + /* + * the comparison was not successful + * rebuild the device UID with at least one + * known path in case a z/VM hyperswap command + * has changed the device + * + * after this compare again + * + * if either the rebuild or the recompare fails + * the path can not be used + */ + if (rebuild_device_uid(device, data) || + dasd_eckd_compare_path_uid( + device, &path_private)) { + uid = &path_private.uid; + if (strlen(uid->vduit) > 0) + snprintf(print_uid, sizeof(print_uid), + "%s.%s.%04x.%02x.%s", + uid->vendor, uid->serial, + uid->ssid, uid->real_unit_addr, + uid->vduit); + else + snprintf(print_uid, sizeof(print_uid), + "%s.%s.%04x.%02x", + uid->vendor, uid->serial, + uid->ssid, + uid->real_unit_addr); + dev_err(&device->cdev->dev, + "The newly added channel path %02X " + "will not be used because it leads " + "to a different device %s\n", + lpm, print_uid); + opm &= ~lpm; + npm &= ~lpm; + ppm &= ~lpm; + cablepm |= lpm; + continue; + } + } + + /* + * There is a small chance that a path is lost again between + * above path verification and the following modification of + * the device opm mask. We could avoid that race here by using + * yet another path mask, but we rather deal with this unlikely + * situation in dasd_start_IO. + */ + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + if (!dasd_path_get_opm(device) && opm) { + dasd_path_set_opm(device, opm); + dasd_generic_path_operational(device); + } else { + dasd_path_add_opm(device, opm); + } + dasd_path_add_nppm(device, npm); + dasd_path_add_ppm(device, ppm); + dasd_path_add_tbvpm(device, epm); + dasd_path_add_cablepm(device, cablepm); + dasd_path_add_nohpfpm(device, hpfpm); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + } + clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags); + dasd_put_device(device); + if (data->isglobal) + mutex_unlock(&dasd_path_verification_mutex); + else + kfree(data); +} + +static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm) +{ + struct path_verification_work_data *data; + + data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA); + if (!data) { + if (mutex_trylock(&dasd_path_verification_mutex)) { + data = path_verification_worker; + data->isglobal = 1; + } else + return -ENOMEM; + } else { + memset(data, 0, sizeof(*data)); + data->isglobal = 0; + } + INIT_WORK(&data->worker, do_path_verification_work); + dasd_get_device(device); + data->device = device; + data->tbvpm = lpm; + schedule_work(&data->worker); + return 0; +} + +static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm) +{ + struct dasd_eckd_private *private = device->private; + unsigned long flags; + + if (!private->fcx_max_data) + private->fcx_max_data = get_fcx_max_data(device); + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device)); + dasd_schedule_device_bh(device); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); +} + +static int dasd_eckd_read_features(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + struct dasd_psf_prssd_data *prssdp; + struct dasd_rssd_features *features; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + int rc; + + memset(&private->features, 0, sizeof(struct dasd_rssd_features)); + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */, + (sizeof(struct dasd_psf_prssd_data) + + sizeof(struct dasd_rssd_features)), + device, NULL); + if (IS_ERR(cqr)) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not " + "allocate initialization request"); + return PTR_ERR(cqr); + } + cqr->startdev = device; + cqr->memdev = device; + cqr->block = NULL; + cqr->retries = 256; + cqr->expires = 10 * HZ; + + /* Prepare for Read Subsystem Data */ + prssdp = (struct dasd_psf_prssd_data *) cqr->data; + memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data)); + prssdp->order = PSF_ORDER_PRSSD; + prssdp->suborder = 0x41; /* Read Feature Codes */ + /* all other bytes of prssdp must be zero */ + + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_PSF; + ccw->count = sizeof(struct dasd_psf_prssd_data); + ccw->flags |= CCW_FLAG_CC; + ccw->cda = (__u32)(addr_t) prssdp; + + /* Read Subsystem Data - feature codes */ + features = (struct dasd_rssd_features *) (prssdp + 1); + memset(features, 0, sizeof(struct dasd_rssd_features)); + + ccw++; + ccw->cmd_code = DASD_ECKD_CCW_RSSD; + ccw->count = sizeof(struct dasd_rssd_features); + ccw->cda = (__u32)(addr_t) features; + + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + rc = dasd_sleep_on(cqr); + if (rc == 0) { + prssdp = (struct dasd_psf_prssd_data *) cqr->data; + features = (struct dasd_rssd_features *) (prssdp + 1); + memcpy(&private->features, features, + sizeof(struct dasd_rssd_features)); + } else + dev_warn(&device->cdev->dev, "Reading device feature codes" + " failed with rc=%d\n", rc); + dasd_sfree_request(cqr, cqr->memdev); + return rc; +} + + +/* + * Build CP for Perform Subsystem Function - SSC. + */ +static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device, + int enable_pav) +{ + struct dasd_ccw_req *cqr; + struct dasd_psf_ssc_data *psf_ssc_data; + struct ccw1 *ccw; + + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ , + sizeof(struct dasd_psf_ssc_data), + device, NULL); + + if (IS_ERR(cqr)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Could not allocate PSF-SSC request"); + return cqr; + } + psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data; + psf_ssc_data->order = PSF_ORDER_SSC; + psf_ssc_data->suborder = 0xc0; + if (enable_pav) { + psf_ssc_data->suborder |= 0x08; + psf_ssc_data->reserved[0] = 0x88; + } + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_PSF; + ccw->cda = (__u32)(addr_t)psf_ssc_data; + ccw->count = 66; + + cqr->startdev = device; + cqr->memdev = device; + cqr->block = NULL; + cqr->retries = 256; + cqr->expires = 10*HZ; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + return cqr; +} + +/* + * Perform Subsystem Function. + * It is necessary to trigger CIO for channel revalidation since this + * call might change behaviour of DASD devices. + */ +static int +dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav, + unsigned long flags) +{ + struct dasd_ccw_req *cqr; + int rc; + + cqr = dasd_eckd_build_psf_ssc(device, enable_pav); + if (IS_ERR(cqr)) + return PTR_ERR(cqr); + + /* + * set flags e.g. turn on failfast, to prevent blocking + * the calling function should handle failed requests + */ + cqr->flags |= flags; + + rc = dasd_sleep_on(cqr); + if (!rc) + /* trigger CIO to reprobe devices */ + css_schedule_reprobe(); + else if (cqr->intrc == -EAGAIN) + rc = -EAGAIN; + + dasd_sfree_request(cqr, cqr->memdev); + return rc; +} + +/* + * Valide storage server of current device. + */ +static int dasd_eckd_validate_server(struct dasd_device *device, + unsigned long flags) +{ + struct dasd_eckd_private *private = device->private; + int enable_pav, rc; + + if (private->uid.type == UA_BASE_PAV_ALIAS || + private->uid.type == UA_HYPER_PAV_ALIAS) + return 0; + if (dasd_nopav || MACHINE_IS_VM) + enable_pav = 0; + else + enable_pav = 1; + rc = dasd_eckd_psf_ssc(device, enable_pav, flags); + + /* may be requested feature is not available on server, + * therefore just report error and go ahead */ + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x " + "returned rc=%d", private->uid.ssid, rc); + return rc; +} + +/* + * worker to do a validate server in case of a lost pathgroup + */ +static void dasd_eckd_do_validate_server(struct work_struct *work) +{ + struct dasd_device *device = container_of(work, struct dasd_device, + kick_validate); + unsigned long flags = 0; + + set_bit(DASD_CQR_FLAGS_FAILFAST, &flags); + if (dasd_eckd_validate_server(device, flags) + == -EAGAIN) { + /* schedule worker again if failed */ + schedule_work(&device->kick_validate); + return; + } + + dasd_put_device(device); +} + +static void dasd_eckd_kick_validate_server(struct dasd_device *device) +{ + dasd_get_device(device); + /* exit if device not online or in offline processing */ + if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || + device->state < DASD_STATE_ONLINE) { + dasd_put_device(device); + return; + } + /* queue call to do_validate_server to the kernel event daemon. */ + if (!schedule_work(&device->kick_validate)) + dasd_put_device(device); +} + +/* + * Check device characteristics. + * If the device is accessible using ECKD discipline, the device is enabled. + */ +static int +dasd_eckd_check_characteristics(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + struct dasd_block *block; + struct dasd_uid temp_uid; + int rc, i; + int readonly; + unsigned long value; + + /* setup work queue for validate server*/ + INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server); + /* setup work queue for summary unit check */ + INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check); + + if (!ccw_device_is_pathgroup(device->cdev)) { + dev_warn(&device->cdev->dev, + "A channel path group could not be established\n"); + return -EIO; + } + if (!ccw_device_is_multipath(device->cdev)) { + dev_info(&device->cdev->dev, + "The DASD is not operating in multipath mode\n"); + } + if (!private) { + private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); + if (!private) { + dev_warn(&device->cdev->dev, + "Allocating memory for private DASD data " + "failed\n"); + return -ENOMEM; + } + device->private = private; + } else { + memset(private, 0, sizeof(*private)); + } + /* Invalidate status of initial analysis. */ + private->init_cqr_status = -1; + /* Set default cache operations. */ + private->attrib.operation = DASD_NORMAL_CACHE; + private->attrib.nr_cyl = 0; + + /* Read Configuration Data */ + rc = dasd_eckd_read_conf(device); + if (rc) + goto out_err1; + + /* set some default values */ + device->default_expires = DASD_EXPIRES; + device->default_retries = DASD_RETRIES; + device->path_thrhld = DASD_ECKD_PATH_THRHLD; + device->path_interval = DASD_ECKD_PATH_INTERVAL; + + if (private->gneq) { + value = 1; + for (i = 0; i < private->gneq->timeout.value; i++) + value = 10 * value; + value = value * private->gneq->timeout.number; + /* do not accept useless values */ + if (value != 0 && value <= DASD_EXPIRES_MAX) + device->default_expires = value; + } + + dasd_eckd_get_uid(device, &temp_uid); + if (temp_uid.type == UA_BASE_DEVICE) { + block = dasd_alloc_block(); + if (IS_ERR(block)) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", + "could not allocate dasd " + "block structure"); + rc = PTR_ERR(block); + goto out_err1; + } + device->block = block; + block->base = device; + } + + /* register lcu with alias handling, enable PAV */ + rc = dasd_alias_make_device_known_to_lcu(device); + if (rc) + goto out_err2; + + dasd_eckd_validate_server(device, 0); + + /* device may report different configuration data after LCU setup */ + rc = dasd_eckd_read_conf(device); + if (rc) + goto out_err3; + + /* Read Feature Codes */ + dasd_eckd_read_features(device); + + /* Read Device Characteristics */ + rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC, + &private->rdc_data, 64); + if (rc) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, + "Read device characteristic failed, rc=%d", rc); + goto out_err3; + } + + if ((device->features & DASD_FEATURE_USERAW) && + !(private->rdc_data.facilities.RT_in_LR)) { + dev_err(&device->cdev->dev, "The storage server does not " + "support raw-track access\n"); + rc = -EINVAL; + goto out_err3; + } + + /* find the valid cylinder size */ + if (private->rdc_data.no_cyl == LV_COMPAT_CYL && + private->rdc_data.long_no_cyl) + private->real_cyl = private->rdc_data.long_no_cyl; + else + private->real_cyl = private->rdc_data.no_cyl; + + private->fcx_max_data = get_fcx_max_data(device); + + readonly = dasd_device_is_ro(device); + if (readonly) + set_bit(DASD_FLAG_DEVICE_RO, &device->flags); + + dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) " + "with %d cylinders, %d heads, %d sectors%s\n", + private->rdc_data.dev_type, + private->rdc_data.dev_model, + private->rdc_data.cu_type, + private->rdc_data.cu_model.model, + private->real_cyl, + private->rdc_data.trk_per_cyl, + private->rdc_data.sec_per_trk, + readonly ? ", read-only device" : ""); + return 0; + +out_err3: + dasd_alias_disconnect_device_from_lcu(device); +out_err2: + dasd_free_block(device->block); + device->block = NULL; +out_err1: + dasd_eckd_clear_conf_data(device); + kfree(device->private); + device->private = NULL; + return rc; +} + +static void dasd_eckd_uncheck_device(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + + if (!private) + return; + + dasd_alias_disconnect_device_from_lcu(device); + private->ned = NULL; + private->sneq = NULL; + private->vdsneq = NULL; + private->gneq = NULL; + dasd_eckd_clear_conf_data(device); +} + +static struct dasd_ccw_req * +dasd_eckd_analysis_ccw(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + struct eckd_count *count_data; + struct LO_eckd_data *LO_data; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + int cplength, datasize; + int i; + + cplength = 8; + datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data); + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device, + NULL); + if (IS_ERR(cqr)) + return cqr; + ccw = cqr->cpaddr; + /* Define extent for the first 3 tracks. */ + define_extent(ccw++, cqr->data, 0, 2, + DASD_ECKD_CCW_READ_COUNT, device, 0); + LO_data = cqr->data + sizeof(struct DE_eckd_data); + /* Locate record for the first 4 records on track 0. */ + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, 0, 0, 4, + DASD_ECKD_CCW_READ_COUNT, device, 0); + + count_data = private->count_area; + for (i = 0; i < 4; i++) { + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT; + ccw->flags = 0; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) count_data; + ccw++; + count_data++; + } + + /* Locate record for the first record on track 2. */ + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, 2, 0, 1, + DASD_ECKD_CCW_READ_COUNT, device, 0); + /* Read count ccw. */ + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT; + ccw->flags = 0; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) count_data; + + cqr->block = NULL; + cqr->startdev = device; + cqr->memdev = device; + cqr->retries = 255; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + return cqr; +} + +/* differentiate between 'no record found' and any other error */ +static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr) +{ + char *sense; + if (init_cqr->status == DASD_CQR_DONE) + return INIT_CQR_OK; + else if (init_cqr->status == DASD_CQR_NEED_ERP || + init_cqr->status == DASD_CQR_FAILED) { + sense = dasd_get_sense(&init_cqr->irb); + if (sense && (sense[1] & SNS1_NO_REC_FOUND)) + return INIT_CQR_UNFORMATTED; + else + return INIT_CQR_ERROR; + } else + return INIT_CQR_ERROR; +} + +/* + * This is the callback function for the init_analysis cqr. It saves + * the status of the initial analysis ccw before it frees it and kicks + * the device to continue the startup sequence. This will call + * dasd_eckd_do_analysis again (if the devices has not been marked + * for deletion in the meantime). + */ +static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, + void *data) +{ + struct dasd_device *device = init_cqr->startdev; + struct dasd_eckd_private *private = device->private; + + private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr); + dasd_sfree_request(init_cqr, device); + dasd_kick_device(device); +} + +static int dasd_eckd_start_analysis(struct dasd_block *block) +{ + struct dasd_ccw_req *init_cqr; + + init_cqr = dasd_eckd_analysis_ccw(block->base); + if (IS_ERR(init_cqr)) + return PTR_ERR(init_cqr); + init_cqr->callback = dasd_eckd_analysis_callback; + init_cqr->callback_data = NULL; + init_cqr->expires = 5*HZ; + /* first try without ERP, so we can later handle unformatted + * devices as special case + */ + clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags); + init_cqr->retries = 0; + dasd_add_request_head(init_cqr); + return -EAGAIN; +} + +static int dasd_eckd_end_analysis(struct dasd_block *block) +{ + struct dasd_device *device = block->base; + struct dasd_eckd_private *private = device->private; + struct eckd_count *count_area; + unsigned int sb, blk_per_trk; + int status, i; + struct dasd_ccw_req *init_cqr; + + status = private->init_cqr_status; + private->init_cqr_status = -1; + if (status == INIT_CQR_ERROR) { + /* try again, this time with full ERP */ + init_cqr = dasd_eckd_analysis_ccw(device); + dasd_sleep_on(init_cqr); + status = dasd_eckd_analysis_evaluation(init_cqr); + dasd_sfree_request(init_cqr, device); + } + + if (device->features & DASD_FEATURE_USERAW) { + block->bp_block = DASD_RAW_BLOCKSIZE; + blk_per_trk = DASD_RAW_BLOCK_PER_TRACK; + block->s2b_shift = 3; + goto raw; + } + + if (status == INIT_CQR_UNFORMATTED) { + dev_warn(&device->cdev->dev, "The DASD is not formatted\n"); + return -EMEDIUMTYPE; + } else if (status == INIT_CQR_ERROR) { + dev_err(&device->cdev->dev, + "Detecting the DASD disk layout failed because " + "of an I/O error\n"); + return -EIO; + } + + private->uses_cdl = 1; + /* Check Track 0 for Compatible Disk Layout */ + count_area = NULL; + for (i = 0; i < 3; i++) { + if (private->count_area[i].kl != 4 || + private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 || + private->count_area[i].cyl != 0 || + private->count_area[i].head != count_area_head[i] || + private->count_area[i].record != count_area_rec[i]) { + private->uses_cdl = 0; + break; + } + } + if (i == 3) + count_area = &private->count_area[4]; + + if (private->uses_cdl == 0) { + for (i = 0; i < 5; i++) { + if ((private->count_area[i].kl != 0) || + (private->count_area[i].dl != + private->count_area[0].dl) || + private->count_area[i].cyl != 0 || + private->count_area[i].head != count_area_head[i] || + private->count_area[i].record != count_area_rec[i]) + break; + } + if (i == 5) + count_area = &private->count_area[0]; + } else { + if (private->count_area[3].record == 1) + dev_warn(&device->cdev->dev, + "Track 0 has no records following the VTOC\n"); + } + + if (count_area != NULL && count_area->kl == 0) { + /* we found notthing violating our disk layout */ + if (dasd_check_blocksize(count_area->dl) == 0) + block->bp_block = count_area->dl; + } + if (block->bp_block == 0) { + dev_warn(&device->cdev->dev, + "The disk layout of the DASD is not supported\n"); + return -EMEDIUMTYPE; + } + block->s2b_shift = 0; /* bits to shift 512 to get a block */ + for (sb = 512; sb < block->bp_block; sb = sb << 1) + block->s2b_shift++; + + blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block); + +raw: + block->blocks = ((unsigned long) private->real_cyl * + private->rdc_data.trk_per_cyl * + blk_per_trk); + + dev_info(&device->cdev->dev, + "DASD with %u KB/block, %lu KB total size, %u KB/track, " + "%s\n", (block->bp_block >> 10), + (((unsigned long) private->real_cyl * + private->rdc_data.trk_per_cyl * + blk_per_trk * (block->bp_block >> 9)) >> 1), + ((blk_per_trk * block->bp_block) >> 10), + private->uses_cdl ? + "compatible disk layout" : "linux disk layout"); + + return 0; +} + +static int dasd_eckd_do_analysis(struct dasd_block *block) +{ + struct dasd_eckd_private *private = block->base->private; + + if (private->init_cqr_status < 0) + return dasd_eckd_start_analysis(block); + else + return dasd_eckd_end_analysis(block); +} + +static int dasd_eckd_basic_to_ready(struct dasd_device *device) +{ + return dasd_alias_add_device(device); +}; + +static int dasd_eckd_online_to_ready(struct dasd_device *device) +{ + if (cancel_work_sync(&device->reload_device)) + dasd_put_device(device); + if (cancel_work_sync(&device->kick_validate)) + dasd_put_device(device); + + return 0; +}; + +static int dasd_eckd_basic_to_known(struct dasd_device *device) +{ + return dasd_alias_remove_device(device); +}; + +static int +dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) +{ + struct dasd_eckd_private *private = block->base->private; + + if (dasd_check_blocksize(block->bp_block) == 0) { + geo->sectors = recs_per_track(&private->rdc_data, + 0, block->bp_block); + } + geo->cylinders = private->rdc_data.no_cyl; + geo->heads = private->rdc_data.trk_per_cyl; + return 0; +} + +/* + * Build the TCW request for the format check + */ +static struct dasd_ccw_req * +dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata, + int enable_pav, struct eckd_count *fmt_buffer, + int rpt) +{ + struct dasd_eckd_private *start_priv; + struct dasd_device *startdev = NULL; + struct tidaw *last_tidaw = NULL; + struct dasd_ccw_req *cqr; + struct itcw *itcw; + int itcw_size; + int count; + int rc; + int i; + + if (enable_pav) + startdev = dasd_alias_get_start_dev(base); + + if (!startdev) + startdev = base; + + start_priv = startdev->private; + + count = rpt * (fdata->stop_unit - fdata->start_unit + 1); + + /* + * we're adding 'count' amount of tidaw to the itcw. + * calculate the corresponding itcw_size + */ + itcw_size = itcw_calc_size(0, count, 0); + + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev, + NULL); + if (IS_ERR(cqr)) + return cqr; + + start_priv->count++; + + itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0); + if (IS_ERR(itcw)) { + rc = -EINVAL; + goto out_err; + } + + cqr->cpaddr = itcw_get_tcw(itcw); + rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count, + sizeof(struct eckd_count), + count * sizeof(struct eckd_count), 0, rpt); + if (rc) + goto out_err; + + for (i = 0; i < count; i++) { + last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++, + sizeof(struct eckd_count)); + if (IS_ERR(last_tidaw)) { + rc = -EINVAL; + goto out_err; + } + } + + last_tidaw->flags |= TIDAW_FLAGS_LAST; + itcw_finalize(itcw); + + cqr->cpmode = 1; + cqr->startdev = startdev; + cqr->memdev = startdev; + cqr->basedev = base; + cqr->retries = startdev->default_retries; + cqr->expires = startdev->default_expires * HZ; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + /* Set flags to suppress output for expected errors */ + set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags); + set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags); + + return cqr; + +out_err: + dasd_sfree_request(cqr, startdev); + + return ERR_PTR(rc); +} + +/* + * Build the CCW request for the format check + */ +static struct dasd_ccw_req * +dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata, + int enable_pav, struct eckd_count *fmt_buffer, int rpt) +{ + struct dasd_eckd_private *start_priv; + struct dasd_eckd_private *base_priv; + struct dasd_device *startdev = NULL; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + void *data; + int cplength, datasize; + int use_prefix; + int count; + int i; + + if (enable_pav) + startdev = dasd_alias_get_start_dev(base); + + if (!startdev) + startdev = base; + + start_priv = startdev->private; + base_priv = base->private; + + count = rpt * (fdata->stop_unit - fdata->start_unit + 1); + + use_prefix = base_priv->features.feature[8] & 0x01; + + if (use_prefix) { + cplength = 1; + datasize = sizeof(struct PFX_eckd_data); + } else { + cplength = 2; + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data); + } + cplength += count; + + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, + startdev, NULL); + if (IS_ERR(cqr)) + return cqr; + + start_priv->count++; + data = cqr->data; + ccw = cqr->cpaddr; + + if (use_prefix) { + prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0, + count, 0, 0); + } else { + define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_READ_COUNT, startdev, 0); + + data += sizeof(struct DE_eckd_data); + ccw[-1].flags |= CCW_FLAG_CC; + + locate_record(ccw++, data, fdata->start_unit, 0, count, + DASD_ECKD_CCW_READ_COUNT, base, 0); + } + + for (i = 0; i < count; i++) { + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT; + ccw->flags = CCW_FLAG_SLI; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) fmt_buffer; + ccw++; + fmt_buffer++; + } + + cqr->startdev = startdev; + cqr->memdev = startdev; + cqr->basedev = base; + cqr->retries = DASD_RETRIES; + cqr->expires = startdev->default_expires * HZ; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + /* Set flags to suppress output for expected errors */ + set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags); + + return cqr; +} + +static struct dasd_ccw_req * +dasd_eckd_build_format(struct dasd_device *base, + struct format_data_t *fdata, + int enable_pav) +{ + struct dasd_eckd_private *base_priv; + struct dasd_eckd_private *start_priv; + struct dasd_device *startdev = NULL; + struct dasd_ccw_req *fcp; + struct eckd_count *ect; + struct ch_t address; + struct ccw1 *ccw; + void *data; + int rpt; + int cplength, datasize; + int i, j; + int intensity = 0; + int r0_perm; + int nr_tracks; + int use_prefix; + + if (enable_pav) + startdev = dasd_alias_get_start_dev(base); + + if (!startdev) + startdev = base; + + start_priv = startdev->private; + base_priv = base->private; + + rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize); + + nr_tracks = fdata->stop_unit - fdata->start_unit + 1; + + /* + * fdata->intensity is a bit string that tells us what to do: + * Bit 0: write record zero + * Bit 1: write home address, currently not supported + * Bit 2: invalidate tracks + * Bit 3: use OS/390 compatible disk layout (cdl) + * Bit 4: do not allow storage subsystem to modify record zero + * Only some bit combinations do make sense. + */ + if (fdata->intensity & 0x10) { + r0_perm = 0; + intensity = fdata->intensity & ~0x10; + } else { + r0_perm = 1; + intensity = fdata->intensity; + } + + use_prefix = base_priv->features.feature[8] & 0x01; + + switch (intensity) { + case 0x00: /* Normal format */ + case 0x08: /* Normal format, use cdl. */ + cplength = 2 + (rpt*nr_tracks); + if (use_prefix) + datasize = sizeof(struct PFX_eckd_data) + + sizeof(struct LO_eckd_data) + + rpt * nr_tracks * sizeof(struct eckd_count); + else + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data) + + rpt * nr_tracks * sizeof(struct eckd_count); + break; + case 0x01: /* Write record zero and format track. */ + case 0x09: /* Write record zero and format track, use cdl. */ + cplength = 2 + rpt * nr_tracks; + if (use_prefix) + datasize = sizeof(struct PFX_eckd_data) + + sizeof(struct LO_eckd_data) + + sizeof(struct eckd_count) + + rpt * nr_tracks * sizeof(struct eckd_count); + else + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data) + + sizeof(struct eckd_count) + + rpt * nr_tracks * sizeof(struct eckd_count); + break; + case 0x04: /* Invalidate track. */ + case 0x0c: /* Invalidate track, use cdl. */ + cplength = 3; + if (use_prefix) + datasize = sizeof(struct PFX_eckd_data) + + sizeof(struct LO_eckd_data) + + sizeof(struct eckd_count); + else + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data) + + sizeof(struct eckd_count); + break; + default: + dev_warn(&startdev->cdev->dev, + "An I/O control call used incorrect flags 0x%x\n", + fdata->intensity); + return ERR_PTR(-EINVAL); + } + /* Allocate the format ccw request. */ + fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, + datasize, startdev, NULL); + if (IS_ERR(fcp)) + return fcp; + + start_priv->count++; + data = fcp->data; + ccw = fcp->cpaddr; + + switch (intensity & ~0x08) { + case 0x00: /* Normal format. */ + if (use_prefix) { + prefix(ccw++, (struct PFX_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_CKD, base, startdev); + /* grant subsystem permission to format R0 */ + if (r0_perm) + ((struct PFX_eckd_data *)data) + ->define_extent.ga_extended |= 0x04; + data += sizeof(struct PFX_eckd_data); + } else { + define_extent(ccw++, (struct DE_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_CKD, startdev, 0); + /* grant subsystem permission to format R0 */ + if (r0_perm) + ((struct DE_eckd_data *) data) + ->ga_extended |= 0x04; + data += sizeof(struct DE_eckd_data); + } + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, (struct LO_eckd_data *) data, + fdata->start_unit, 0, rpt*nr_tracks, + DASD_ECKD_CCW_WRITE_CKD, base, + fdata->blksize); + data += sizeof(struct LO_eckd_data); + break; + case 0x01: /* Write record zero + format track. */ + if (use_prefix) { + prefix(ccw++, (struct PFX_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_RECORD_ZERO, + base, startdev); + data += sizeof(struct PFX_eckd_data); + } else { + define_extent(ccw++, (struct DE_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0); + data += sizeof(struct DE_eckd_data); + } + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, (struct LO_eckd_data *) data, + fdata->start_unit, 0, rpt * nr_tracks + 1, + DASD_ECKD_CCW_WRITE_RECORD_ZERO, base, + base->block->bp_block); + data += sizeof(struct LO_eckd_data); + break; + case 0x04: /* Invalidate track. */ + if (use_prefix) { + prefix(ccw++, (struct PFX_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_CKD, base, startdev); + data += sizeof(struct PFX_eckd_data); + } else { + define_extent(ccw++, (struct DE_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_CKD, startdev, 0); + data += sizeof(struct DE_eckd_data); + } + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, (struct LO_eckd_data *) data, + fdata->start_unit, 0, 1, + DASD_ECKD_CCW_WRITE_CKD, base, 8); + data += sizeof(struct LO_eckd_data); + break; + } + + for (j = 0; j < nr_tracks; j++) { + /* calculate cylinder and head for the current track */ + set_ch_t(&address, + (fdata->start_unit + j) / + base_priv->rdc_data.trk_per_cyl, + (fdata->start_unit + j) % + base_priv->rdc_data.trk_per_cyl); + if (intensity & 0x01) { /* write record zero */ + ect = (struct eckd_count *) data; + data += sizeof(struct eckd_count); + ect->cyl = address.cyl; + ect->head = address.head; + ect->record = 0; + ect->kl = 0; + ect->dl = 8; + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO; + ccw->flags = CCW_FLAG_SLI; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) ect; + ccw++; + } + if ((intensity & ~0x08) & 0x04) { /* erase track */ + ect = (struct eckd_count *) data; + data += sizeof(struct eckd_count); + ect->cyl = address.cyl; + ect->head = address.head; + ect->record = 1; + ect->kl = 0; + ect->dl = 0; + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD; + ccw->flags = CCW_FLAG_SLI; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) ect; + } else { /* write remaining records */ + for (i = 0; i < rpt; i++) { + ect = (struct eckd_count *) data; + data += sizeof(struct eckd_count); + ect->cyl = address.cyl; + ect->head = address.head; + ect->record = i + 1; + ect->kl = 0; + ect->dl = fdata->blksize; + /* + * Check for special tracks 0-1 + * when formatting CDL + */ + if ((intensity & 0x08) && + address.cyl == 0 && address.head == 0) { + if (i < 3) { + ect->kl = 4; + ect->dl = sizes_trk0[i] - 4; + } + } + if ((intensity & 0x08) && + address.cyl == 0 && address.head == 1) { + ect->kl = 44; + ect->dl = LABEL_SIZE - 44; + } + ccw[-1].flags |= CCW_FLAG_CC; + if (i != 0 || j == 0) + ccw->cmd_code = + DASD_ECKD_CCW_WRITE_CKD; + else + ccw->cmd_code = + DASD_ECKD_CCW_WRITE_CKD_MT; + ccw->flags = CCW_FLAG_SLI; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) ect; + ccw++; + } + } + } + + fcp->startdev = startdev; + fcp->memdev = startdev; + fcp->basedev = base; + fcp->retries = 256; + fcp->expires = startdev->default_expires * HZ; + fcp->buildclk = get_tod_clock(); + fcp->status = DASD_CQR_FILLED; + + return fcp; +} + +/* + * Wrapper function to build a CCW request depending on input data + */ +static struct dasd_ccw_req * +dasd_eckd_format_build_ccw_req(struct dasd_device *base, + struct format_data_t *fdata, int enable_pav, + int tpm, struct eckd_count *fmt_buffer, int rpt) +{ + struct dasd_ccw_req *ccw_req; + + if (!fmt_buffer) { + ccw_req = dasd_eckd_build_format(base, fdata, enable_pav); + } else { + if (tpm) + ccw_req = dasd_eckd_build_check_tcw(base, fdata, + enable_pav, + fmt_buffer, rpt); + else + ccw_req = dasd_eckd_build_check(base, fdata, enable_pav, + fmt_buffer, rpt); + } + + return ccw_req; +} + +/* + * Sanity checks on format_data + */ +static int dasd_eckd_format_sanity_checks(struct dasd_device *base, + struct format_data_t *fdata) +{ + struct dasd_eckd_private *private = base->private; + + if (fdata->start_unit >= + (private->real_cyl * private->rdc_data.trk_per_cyl)) { + dev_warn(&base->cdev->dev, + "Start track number %u used in formatting is too big\n", + fdata->start_unit); + return -EINVAL; + } + if (fdata->stop_unit >= + (private->real_cyl * private->rdc_data.trk_per_cyl)) { + dev_warn(&base->cdev->dev, + "Stop track number %u used in formatting is too big\n", + fdata->stop_unit); + return -EINVAL; + } + if (fdata->start_unit > fdata->stop_unit) { + dev_warn(&base->cdev->dev, + "Start track %u used in formatting exceeds end track\n", + fdata->start_unit); + return -EINVAL; + } + if (dasd_check_blocksize(fdata->blksize) != 0) { + dev_warn(&base->cdev->dev, + "The DASD cannot be formatted with block size %u\n", + fdata->blksize); + return -EINVAL; + } + return 0; +} + +/* + * This function will process format_data originally coming from an IOCTL + */ +static int dasd_eckd_format_process_data(struct dasd_device *base, + struct format_data_t *fdata, + int enable_pav, int tpm, + struct eckd_count *fmt_buffer, int rpt, + struct irb *irb) +{ + struct dasd_eckd_private *private = base->private; + struct dasd_ccw_req *cqr, *n; + struct list_head format_queue; + struct dasd_device *device; + char *sense = NULL; + int old_start, old_stop, format_step; + int step, retry; + int rc; + + rc = dasd_eckd_format_sanity_checks(base, fdata); + if (rc) + return rc; + + INIT_LIST_HEAD(&format_queue); + + old_start = fdata->start_unit; + old_stop = fdata->stop_unit; + + if (!tpm && fmt_buffer != NULL) { + /* Command Mode / Format Check */ + format_step = 1; + } else if (tpm && fmt_buffer != NULL) { + /* Transport Mode / Format Check */ + format_step = DASD_CQR_MAX_CCW / rpt; + } else { + /* Normal Formatting */ + format_step = DASD_CQR_MAX_CCW / + recs_per_track(&private->rdc_data, 0, fdata->blksize); + } + + do { + retry = 0; + while (fdata->start_unit <= old_stop) { + step = fdata->stop_unit - fdata->start_unit + 1; + if (step > format_step) { + fdata->stop_unit = + fdata->start_unit + format_step - 1; + } + + cqr = dasd_eckd_format_build_ccw_req(base, fdata, + enable_pav, tpm, + fmt_buffer, rpt); + if (IS_ERR(cqr)) { + rc = PTR_ERR(cqr); + if (rc == -ENOMEM) { + if (list_empty(&format_queue)) + goto out; + /* + * not enough memory available, start + * requests retry after first requests + * were finished + */ + retry = 1; + break; + } + goto out_err; + } + list_add_tail(&cqr->blocklist, &format_queue); + + if (fmt_buffer) { + step = fdata->stop_unit - fdata->start_unit + 1; + fmt_buffer += rpt * step; + } + fdata->start_unit = fdata->stop_unit + 1; + fdata->stop_unit = old_stop; + } + + rc = dasd_sleep_on_queue(&format_queue); + +out_err: + list_for_each_entry_safe(cqr, n, &format_queue, blocklist) { + device = cqr->startdev; + private = device->private; + + if (cqr->status == DASD_CQR_FAILED) { + /* + * Only get sense data if called by format + * check + */ + if (fmt_buffer && irb) { + sense = dasd_get_sense(&cqr->irb); + memcpy(irb, &cqr->irb, sizeof(*irb)); + } + rc = -EIO; + } + list_del_init(&cqr->blocklist); + dasd_sfree_request(cqr, device); + private->count--; + } + + if (rc && rc != -EIO) + goto out; + if (rc == -EIO) { + /* + * In case fewer than the expected records are on the + * track, we will most likely get a 'No Record Found' + * error (in command mode) or a 'File Protected' error + * (in transport mode). Those particular cases shouldn't + * pass the -EIO to the IOCTL, therefore reset the rc + * and continue. + */ + if (sense && + (sense[1] & SNS1_NO_REC_FOUND || + sense[1] & SNS1_FILE_PROTECTED)) + retry = 1; + else + goto out; + } + + } while (retry); + +out: + fdata->start_unit = old_start; + fdata->stop_unit = old_stop; + + return rc; +} + +static int dasd_eckd_format_device(struct dasd_device *base, + struct format_data_t *fdata, int enable_pav) +{ + return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL, + 0, NULL); +} + +/* + * Helper function to count consecutive records of a single track. + */ +static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start, + int max) +{ + int head; + int i; + + head = fmt_buffer[start].head; + + /* + * There are 3 conditions where we stop counting: + * - if data reoccurs (same head and record may reoccur), which may + * happen due to the way DASD_ECKD_CCW_READ_COUNT works + * - when the head changes, because we're iterating over several tracks + * then (DASD_ECKD_CCW_READ_COUNT_MT) + * - when we've reached the end of sensible data in the buffer (the + * record will be 0 then) + */ + for (i = start; i < max; i++) { + if (i > start) { + if ((fmt_buffer[i].head == head && + fmt_buffer[i].record == 1) || + fmt_buffer[i].head != head || + fmt_buffer[i].record == 0) + break; + } + } + + return i - start; +} + +/* + * Evaluate a given range of tracks. Data like number of records, blocksize, + * record ids, and key length are compared with expected data. + * + * If a mismatch occurs, the corresponding error bit is set, as well as + * additional information, depending on the error. + */ +static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer, + struct format_check_t *cdata, + int rpt_max, int rpt_exp, + int trk_per_cyl, int tpm) +{ + struct ch_t geo; + int max_entries; + int count = 0; + int trkcount; + int blksize; + int pos = 0; + int i, j; + int kl; + + trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1; + max_entries = trkcount * rpt_max; + + for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) { + /* Calculate the correct next starting position in the buffer */ + if (tpm) { + while (fmt_buffer[pos].record == 0 && + fmt_buffer[pos].dl == 0) { + if (pos++ > max_entries) + break; + } + } else { + if (i != cdata->expect.start_unit) + pos += rpt_max - count; + } + + /* Calculate the expected geo values for the current track */ + set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl); + + /* Count and check number of records */ + count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max); + + if (count < rpt_exp) { + cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS; + break; + } + if (count > rpt_exp) { + cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS; + break; + } + + for (j = 0; j < count; j++, pos++) { + blksize = cdata->expect.blksize; + kl = 0; + + /* + * Set special values when checking CDL formatted + * devices. + */ + if ((cdata->expect.intensity & 0x08) && + geo.cyl == 0 && geo.head == 0) { + if (j < 3) { + blksize = sizes_trk0[j] - 4; + kl = 4; + } + } + if ((cdata->expect.intensity & 0x08) && + geo.cyl == 0 && geo.head == 1) { + blksize = LABEL_SIZE - 44; + kl = 44; + } + + /* Check blocksize */ + if (fmt_buffer[pos].dl != blksize) { + cdata->result = DASD_FMT_ERR_BLKSIZE; + goto out; + } + /* Check if key length is 0 */ + if (fmt_buffer[pos].kl != kl) { + cdata->result = DASD_FMT_ERR_KEY_LENGTH; + goto out; + } + /* Check if record_id is correct */ + if (fmt_buffer[pos].cyl != geo.cyl || + fmt_buffer[pos].head != geo.head || + fmt_buffer[pos].record != (j + 1)) { + cdata->result = DASD_FMT_ERR_RECORD_ID; + goto out; + } + } + } + +out: + /* + * In case of no errors, we need to decrease by one + * to get the correct positions. + */ + if (!cdata->result) { + i--; + pos--; + } + + cdata->unit = i; + cdata->num_records = count; + cdata->rec = fmt_buffer[pos].record; + cdata->blksize = fmt_buffer[pos].dl; + cdata->key_length = fmt_buffer[pos].kl; +} + +/* + * Check the format of a range of tracks of a DASD. + */ +static int dasd_eckd_check_device_format(struct dasd_device *base, + struct format_check_t *cdata, + int enable_pav) +{ + struct dasd_eckd_private *private = base->private; + struct eckd_count *fmt_buffer; + struct irb irb; + int rpt_max, rpt_exp; + int fmt_buffer_size; + int trk_per_cyl; + int trkcount; + int tpm = 0; + int rc; + + trk_per_cyl = private->rdc_data.trk_per_cyl; + + /* Get maximum and expected amount of records per track */ + rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1; + rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize); + + trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1; + fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count); + + fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA); + if (!fmt_buffer) + return -ENOMEM; + + /* + * A certain FICON feature subset is needed to operate in transport + * mode. Additionally, the support for transport mode is implicitly + * checked by comparing the buffer size with fcx_max_data. As long as + * the buffer size is smaller we can operate in transport mode and + * process multiple tracks. If not, only one track at once is being + * processed using command mode. + */ + if ((private->features.feature[40] & 0x04) && + fmt_buffer_size <= private->fcx_max_data) + tpm = 1; + + rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav, + tpm, fmt_buffer, rpt_max, &irb); + if (rc && rc != -EIO) + goto out; + if (rc == -EIO) { + /* + * If our first attempt with transport mode enabled comes back + * with an incorrect length error, we're going to retry the + * check with command mode. + */ + if (tpm && scsw_cstat(&irb.scsw) == 0x40) { + tpm = 0; + rc = dasd_eckd_format_process_data(base, &cdata->expect, + enable_pav, tpm, + fmt_buffer, rpt_max, + &irb); + if (rc) + goto out; + } else { + goto out; + } + } + + dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp, + trk_per_cyl, tpm); + +out: + kfree(fmt_buffer); + + return rc; +} + +static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr) +{ + if (cqr->retries < 0) { + cqr->status = DASD_CQR_FAILED; + return; + } + cqr->status = DASD_CQR_FILLED; + if (cqr->block && (cqr->startdev != cqr->block->base)) { + dasd_eckd_reset_ccw_to_base_io(cqr); + cqr->startdev = cqr->block->base; + cqr->lpm = dasd_path_get_opm(cqr->block->base); + } +}; + +static dasd_erp_fn_t +dasd_eckd_erp_action(struct dasd_ccw_req * cqr) +{ + struct dasd_device *device = (struct dasd_device *) cqr->startdev; + struct ccw_device *cdev = device->cdev; + + switch (cdev->id.cu_type) { + case 0x3990: + case 0x2105: + case 0x2107: + case 0x1750: + return dasd_3990_erp_action; + case 0x9343: + case 0x3880: + default: + return dasd_default_erp_action; + } +} + +static dasd_erp_fn_t +dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr) +{ + return dasd_default_erp_postaction; +} + +static void dasd_eckd_check_for_device_change(struct dasd_device *device, + struct dasd_ccw_req *cqr, + struct irb *irb) +{ + char mask; + char *sense = NULL; + struct dasd_eckd_private *private = device->private; + + /* first of all check for state change pending interrupt */ + mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; + if ((scsw_dstat(&irb->scsw) & mask) == mask) { + /* + * for alias only, not in offline processing + * and only if not suspended + */ + if (!device->block && private->lcu && + device->state == DASD_STATE_ONLINE && + !test_bit(DASD_FLAG_OFFLINE, &device->flags) && + !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) { + /* schedule worker to reload device */ + dasd_reload_device(device); + } + dasd_generic_handle_state_change(device); + return; + } + + sense = dasd_get_sense(irb); + if (!sense) + return; + + /* summary unit check */ + if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) && + (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) { + if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "eckd suc: device already notified"); + return; + } + sense = dasd_get_sense(irb); + if (!sense) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "eckd suc: no reason code available"); + clear_bit(DASD_FLAG_SUC, &device->flags); + return; + + } + private->suc_reason = sense[8]; + DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x", + "eckd handle summary unit check: reason", + private->suc_reason); + dasd_get_device(device); + if (!schedule_work(&device->suc_work)) + dasd_put_device(device); + + return; + } + + /* service information message SIM */ + if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) && + ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) { + dasd_3990_erp_handle_sim(device, sense); + return; + } + + /* loss of device reservation is handled via base devices only + * as alias devices may be used with several bases + */ + if (device->block && (sense[27] & DASD_SENSE_BIT_0) && + (sense[7] == 0x3F) && + (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && + test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) { + if (device->features & DASD_FEATURE_FAILONSLCK) + set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags); + clear_bit(DASD_FLAG_IS_RESERVED, &device->flags); + dev_err(&device->cdev->dev, + "The device reservation was lost\n"); + } +} + +static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single( + struct dasd_device *startdev, + struct dasd_block *block, + struct request *req, + sector_t first_rec, + sector_t last_rec, + sector_t first_trk, + sector_t last_trk, + unsigned int first_offs, + unsigned int last_offs, + unsigned int blk_per_trk, + unsigned int blksize) +{ + struct dasd_eckd_private *private; + unsigned long *idaws; + struct LO_eckd_data *LO_data; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + struct req_iterator iter; + struct bio_vec bv; + char *dst; + unsigned int off; + int count, cidaw, cplength, datasize; + sector_t recid; + unsigned char cmd, rcmd; + int use_prefix; + struct dasd_device *basedev; + + basedev = block->base; + private = basedev->private; + if (rq_data_dir(req) == READ) + cmd = DASD_ECKD_CCW_READ_MT; + else if (rq_data_dir(req) == WRITE) + cmd = DASD_ECKD_CCW_WRITE_MT; + else + return ERR_PTR(-EINVAL); + + /* Check struct bio and count the number of blocks for the request. */ + count = 0; + cidaw = 0; + rq_for_each_segment(bv, req, iter) { + if (bv.bv_len & (blksize - 1)) + /* Eckd can only do full blocks. */ + return ERR_PTR(-EINVAL); + count += bv.bv_len >> (block->s2b_shift + 9); + if (idal_is_needed (page_address(bv.bv_page), bv.bv_len)) + cidaw += bv.bv_len >> (block->s2b_shift + 9); + } + /* Paranoia. */ + if (count != last_rec - first_rec + 1) + return ERR_PTR(-EINVAL); + + /* use the prefix command if available */ + use_prefix = private->features.feature[8] & 0x01; + if (use_prefix) { + /* 1x prefix + number of blocks */ + cplength = 2 + count; + /* 1x prefix + cidaws*sizeof(long) */ + datasize = sizeof(struct PFX_eckd_data) + + sizeof(struct LO_eckd_data) + + cidaw * sizeof(unsigned long); + } else { + /* 1x define extent + 1x locate record + number of blocks */ + cplength = 2 + count; + /* 1x define extent + 1x locate record + cidaws*sizeof(long) */ + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data) + + cidaw * sizeof(unsigned long); + } + /* Find out the number of additional locate record ccws for cdl. */ + if (private->uses_cdl && first_rec < 2*blk_per_trk) { + if (last_rec >= 2*blk_per_trk) + count = 2*blk_per_trk - first_rec; + cplength += count; + datasize += count*sizeof(struct LO_eckd_data); + } + /* Allocate the ccw request. */ + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, + startdev, blk_mq_rq_to_pdu(req)); + if (IS_ERR(cqr)) + return cqr; + ccw = cqr->cpaddr; + /* First ccw is define extent or prefix. */ + if (use_prefix) { + if (prefix(ccw++, cqr->data, first_trk, + last_trk, cmd, basedev, startdev) == -EAGAIN) { + /* Clock not in sync and XRC is enabled. + * Try again later. + */ + dasd_sfree_request(cqr, startdev); + return ERR_PTR(-EAGAIN); + } + idaws = (unsigned long *) (cqr->data + + sizeof(struct PFX_eckd_data)); + } else { + if (define_extent(ccw++, cqr->data, first_trk, + last_trk, cmd, basedev, 0) == -EAGAIN) { + /* Clock not in sync and XRC is enabled. + * Try again later. + */ + dasd_sfree_request(cqr, startdev); + return ERR_PTR(-EAGAIN); + } + idaws = (unsigned long *) (cqr->data + + sizeof(struct DE_eckd_data)); + } + /* Build locate_record+read/write/ccws. */ + LO_data = (struct LO_eckd_data *) (idaws + cidaw); + recid = first_rec; + if (private->uses_cdl == 0 || recid > 2*blk_per_trk) { + /* Only standard blocks so there is just one locate record. */ + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, first_trk, first_offs + 1, + last_rec - recid + 1, cmd, basedev, blksize); + } + rq_for_each_segment(bv, req, iter) { + dst = page_address(bv.bv_page) + bv.bv_offset; + if (dasd_page_cache) { + char *copy = kmem_cache_alloc(dasd_page_cache, + GFP_DMA | __GFP_NOWARN); + if (copy && rq_data_dir(req) == WRITE) + memcpy(copy + bv.bv_offset, dst, bv.bv_len); + if (copy) + dst = copy + bv.bv_offset; + } + for (off = 0; off < bv.bv_len; off += blksize) { + sector_t trkid = recid; + unsigned int recoffs = sector_div(trkid, blk_per_trk); + rcmd = cmd; + count = blksize; + /* Locate record for cdl special block ? */ + if (private->uses_cdl && recid < 2*blk_per_trk) { + if (dasd_eckd_cdl_special(blk_per_trk, recid)){ + rcmd |= 0x8; + count = dasd_eckd_cdl_reclen(recid); + if (count < blksize && + rq_data_dir(req) == READ) + memset(dst + count, 0xe5, + blksize - count); + } + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, + trkid, recoffs + 1, + 1, rcmd, basedev, count); + } + /* Locate record for standard blocks ? */ + if (private->uses_cdl && recid == 2*blk_per_trk) { + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, + trkid, recoffs + 1, + last_rec - recid + 1, + cmd, basedev, count); + } + /* Read/write ccw. */ + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = rcmd; + ccw->count = count; + if (idal_is_needed(dst, blksize)) { + ccw->cda = (__u32)(addr_t) idaws; + ccw->flags = CCW_FLAG_IDA; + idaws = idal_create_words(idaws, dst, blksize); + } else { + ccw->cda = (__u32)(addr_t) dst; + ccw->flags = 0; + } + ccw++; + dst += blksize; + recid++; + } + } + if (blk_noretry_request(req) || + block->base->features & DASD_FEATURE_FAILFAST) + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + cqr->startdev = startdev; + cqr->memdev = startdev; + cqr->block = block; + cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */ + cqr->lpm = dasd_path_get_ppm(startdev); + cqr->retries = startdev->default_retries; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + return cqr; +} + +static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track( + struct dasd_device *startdev, + struct dasd_block *block, + struct request *req, + sector_t first_rec, + sector_t last_rec, + sector_t first_trk, + sector_t last_trk, + unsigned int first_offs, + unsigned int last_offs, + unsigned int blk_per_trk, + unsigned int blksize) +{ + unsigned long *idaws; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + struct req_iterator iter; + struct bio_vec bv; + char *dst, *idaw_dst; + unsigned int cidaw, cplength, datasize; + unsigned int tlf; + sector_t recid; + unsigned char cmd; + struct dasd_device *basedev; + unsigned int trkcount, count, count_to_trk_end; + unsigned int idaw_len, seg_len, part_len, len_to_track_end; + unsigned char new_track, end_idaw; + sector_t trkid; + unsigned int recoffs; + + basedev = block->base; + if (rq_data_dir(req) == READ) + cmd = DASD_ECKD_CCW_READ_TRACK_DATA; + else if (rq_data_dir(req) == WRITE) + cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA; + else + return ERR_PTR(-EINVAL); + + /* Track based I/O needs IDAWs for each page, and not just for + * 64 bit addresses. We need additional idals for pages + * that get filled from two tracks, so we use the number + * of records as upper limit. + */ + cidaw = last_rec - first_rec + 1; + trkcount = last_trk - first_trk + 1; + + /* 1x prefix + one read/write ccw per track */ + cplength = 1 + trkcount; + + datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long); + + /* Allocate the ccw request. */ + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, + startdev, blk_mq_rq_to_pdu(req)); + if (IS_ERR(cqr)) + return cqr; + ccw = cqr->cpaddr; + /* transfer length factor: how many bytes to read from the last track */ + if (first_trk == last_trk) + tlf = last_offs - first_offs + 1; + else + tlf = last_offs + 1; + tlf *= blksize; + + if (prefix_LRE(ccw++, cqr->data, first_trk, + last_trk, cmd, basedev, startdev, + 1 /* format */, first_offs + 1, + trkcount, blksize, + tlf) == -EAGAIN) { + /* Clock not in sync and XRC is enabled. + * Try again later. + */ + dasd_sfree_request(cqr, startdev); + return ERR_PTR(-EAGAIN); + } + + /* + * The translation of request into ccw programs must meet the + * following conditions: + * - all idaws but the first and the last must address full pages + * (or 2K blocks on 31-bit) + * - the scope of a ccw and it's idal ends with the track boundaries + */ + idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data)); + recid = first_rec; + new_track = 1; + end_idaw = 0; + len_to_track_end = 0; + idaw_dst = NULL; + idaw_len = 0; + rq_for_each_segment(bv, req, iter) { + dst = page_address(bv.bv_page) + bv.bv_offset; + seg_len = bv.bv_len; + while (seg_len) { + if (new_track) { + trkid = recid; + recoffs = sector_div(trkid, blk_per_trk); + count_to_trk_end = blk_per_trk - recoffs; + count = min((last_rec - recid + 1), + (sector_t)count_to_trk_end); + len_to_track_end = count * blksize; + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = cmd; + ccw->count = len_to_track_end; + ccw->cda = (__u32)(addr_t)idaws; + ccw->flags = CCW_FLAG_IDA; + ccw++; + recid += count; + new_track = 0; + /* first idaw for a ccw may start anywhere */ + if (!idaw_dst) + idaw_dst = dst; + } + /* If we start a new idaw, we must make sure that it + * starts on an IDA_BLOCK_SIZE boundary. + * If we continue an idaw, we must make sure that the + * current segment begins where the so far accumulated + * idaw ends + */ + if (!idaw_dst) { + if (__pa(dst) & (IDA_BLOCK_SIZE-1)) { + dasd_sfree_request(cqr, startdev); + return ERR_PTR(-ERANGE); + } else + idaw_dst = dst; + } + if ((idaw_dst + idaw_len) != dst) { + dasd_sfree_request(cqr, startdev); + return ERR_PTR(-ERANGE); + } + part_len = min(seg_len, len_to_track_end); + seg_len -= part_len; + dst += part_len; + idaw_len += part_len; + len_to_track_end -= part_len; + /* collected memory area ends on an IDA_BLOCK border, + * -> create an idaw + * idal_create_words will handle cases where idaw_len + * is larger then IDA_BLOCK_SIZE + */ + if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1))) + end_idaw = 1; + /* We also need to end the idaw at track end */ + if (!len_to_track_end) { + new_track = 1; + end_idaw = 1; + } + if (end_idaw) { + idaws = idal_create_words(idaws, idaw_dst, + idaw_len); + idaw_dst = NULL; + idaw_len = 0; + end_idaw = 0; + } + } + } + + if (blk_noretry_request(req) || + block->base->features & DASD_FEATURE_FAILFAST) + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + cqr->startdev = startdev; + cqr->memdev = startdev; + cqr->block = block; + cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */ + cqr->lpm = dasd_path_get_ppm(startdev); + cqr->retries = startdev->default_retries; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + return cqr; +} + +static int prepare_itcw(struct itcw *itcw, + unsigned int trk, unsigned int totrk, int cmd, + struct dasd_device *basedev, + struct dasd_device *startdev, + unsigned int rec_on_trk, int count, + unsigned int blksize, + unsigned int total_data_size, + unsigned int tlf, + unsigned int blk_per_trk) +{ + struct PFX_eckd_data pfxdata; + struct dasd_eckd_private *basepriv, *startpriv; + struct DE_eckd_data *dedata; + struct LRE_eckd_data *lredata; + struct dcw *dcw; + + u32 begcyl, endcyl; + u16 heads, beghead, endhead; + u8 pfx_cmd; + + int rc = 0; + int sector = 0; + int dn, d; + + + /* setup prefix data */ + basepriv = basedev->private; + startpriv = startdev->private; + dedata = &pfxdata.define_extent; + lredata = &pfxdata.locate_record; + + memset(&pfxdata, 0, sizeof(pfxdata)); + pfxdata.format = 1; /* PFX with LRE */ + pfxdata.base_address = basepriv->ned->unit_addr; + pfxdata.base_lss = basepriv->ned->ID; + pfxdata.validity.define_extent = 1; + + /* private uid is kept up to date, conf_data may be outdated */ + if (startpriv->uid.type == UA_BASE_PAV_ALIAS) + pfxdata.validity.verify_base = 1; + + if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) { + pfxdata.validity.verify_base = 1; + pfxdata.validity.hyper_pav = 1; + } + + switch (cmd) { + case DASD_ECKD_CCW_READ_TRACK_DATA: + dedata->mask.perm = 0x1; + dedata->attributes.operation = basepriv->attrib.operation; + dedata->blk_size = blksize; + dedata->ga_extended |= 0x42; + lredata->operation.orientation = 0x0; + lredata->operation.operation = 0x0C; + lredata->auxiliary.check_bytes = 0x01; + pfx_cmd = DASD_ECKD_CCW_PFX_READ; + break; + case DASD_ECKD_CCW_WRITE_TRACK_DATA: + dedata->mask.perm = 0x02; + dedata->attributes.operation = basepriv->attrib.operation; + dedata->blk_size = blksize; + rc = set_timestamp(NULL, dedata, basedev); + dedata->ga_extended |= 0x42; + lredata->operation.orientation = 0x0; + lredata->operation.operation = 0x3F; + lredata->extended_operation = 0x23; + lredata->auxiliary.check_bytes = 0x2; + /* + * If XRC is supported the System Time Stamp is set. The + * validity of the time stamp must be reflected in the prefix + * data as well. + */ + if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02) + pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */ + pfx_cmd = DASD_ECKD_CCW_PFX; + break; + case DASD_ECKD_CCW_READ_COUNT_MT: + dedata->mask.perm = 0x1; + dedata->attributes.operation = DASD_BYPASS_CACHE; + dedata->ga_extended |= 0x42; + dedata->blk_size = blksize; + lredata->operation.orientation = 0x2; + lredata->operation.operation = 0x16; + lredata->auxiliary.check_bytes = 0x01; + pfx_cmd = DASD_ECKD_CCW_PFX_READ; + break; + default: + DBF_DEV_EVENT(DBF_ERR, basedev, + "prepare itcw, unknown opcode 0x%x", cmd); + BUG(); + break; + } + if (rc) + return rc; + + dedata->attributes.mode = 0x3; /* ECKD */ + + heads = basepriv->rdc_data.trk_per_cyl; + begcyl = trk / heads; + beghead = trk % heads; + endcyl = totrk / heads; + endhead = totrk % heads; + + /* check for sequential prestage - enhance cylinder range */ + if (dedata->attributes.operation == DASD_SEQ_PRESTAGE || + dedata->attributes.operation == DASD_SEQ_ACCESS) { + + if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl) + endcyl += basepriv->attrib.nr_cyl; + else + endcyl = (basepriv->real_cyl - 1); + } + + set_ch_t(&dedata->beg_ext, begcyl, beghead); + set_ch_t(&dedata->end_ext, endcyl, endhead); + + dedata->ep_format = 0x20; /* records per track is valid */ + dedata->ep_rec_per_track = blk_per_trk; + + if (rec_on_trk) { + switch (basepriv->rdc_data.dev_type) { + case 0x3390: + dn = ceil_quot(blksize + 6, 232); + d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34); + sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8; + break; + case 0x3380: + d = 7 + ceil_quot(blksize + 12, 32); + sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7; + break; + } + } + + if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) { + lredata->auxiliary.length_valid = 0; + lredata->auxiliary.length_scope = 0; + lredata->sector = 0xff; + } else { + lredata->auxiliary.length_valid = 1; + lredata->auxiliary.length_scope = 1; + lredata->sector = sector; + } + lredata->auxiliary.imbedded_ccw_valid = 1; + lredata->length = tlf; + lredata->imbedded_ccw = cmd; + lredata->count = count; + set_ch_t(&lredata->seek_addr, begcyl, beghead); + lredata->search_arg.cyl = lredata->seek_addr.cyl; + lredata->search_arg.head = lredata->seek_addr.head; + lredata->search_arg.record = rec_on_trk; + + dcw = itcw_add_dcw(itcw, pfx_cmd, 0, + &pfxdata, sizeof(pfxdata), total_data_size); + return PTR_ERR_OR_ZERO(dcw); +} + +static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track( + struct dasd_device *startdev, + struct dasd_block *block, + struct request *req, + sector_t first_rec, + sector_t last_rec, + sector_t first_trk, + sector_t last_trk, + unsigned int first_offs, + unsigned int last_offs, + unsigned int blk_per_trk, + unsigned int blksize) +{ + struct dasd_ccw_req *cqr; + struct req_iterator iter; + struct bio_vec bv; + char *dst; + unsigned int trkcount, ctidaw; + unsigned char cmd; + struct dasd_device *basedev; + unsigned int tlf; + struct itcw *itcw; + struct tidaw *last_tidaw = NULL; + int itcw_op; + size_t itcw_size; + u8 tidaw_flags; + unsigned int seg_len, part_len, len_to_track_end; + unsigned char new_track; + sector_t recid, trkid; + unsigned int offs; + unsigned int count, count_to_trk_end; + int ret; + + basedev = block->base; + if (rq_data_dir(req) == READ) { + cmd = DASD_ECKD_CCW_READ_TRACK_DATA; + itcw_op = ITCW_OP_READ; + } else if (rq_data_dir(req) == WRITE) { + cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA; + itcw_op = ITCW_OP_WRITE; + } else + return ERR_PTR(-EINVAL); + + /* trackbased I/O needs address all memory via TIDAWs, + * not just for 64 bit addresses. This allows us to map + * each segment directly to one tidaw. + * In the case of write requests, additional tidaws may + * be needed when a segment crosses a track boundary. + */ + trkcount = last_trk - first_trk + 1; + ctidaw = 0; + rq_for_each_segment(bv, req, iter) { + ++ctidaw; + } + if (rq_data_dir(req) == WRITE) + ctidaw += (last_trk - first_trk); + + /* Allocate the ccw request. */ + itcw_size = itcw_calc_size(0, ctidaw, 0); + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev, + blk_mq_rq_to_pdu(req)); + if (IS_ERR(cqr)) + return cqr; + + /* transfer length factor: how many bytes to read from the last track */ + if (first_trk == last_trk) + tlf = last_offs - first_offs + 1; + else + tlf = last_offs + 1; + tlf *= blksize; + + itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0); + if (IS_ERR(itcw)) { + ret = -EINVAL; + goto out_error; + } + cqr->cpaddr = itcw_get_tcw(itcw); + if (prepare_itcw(itcw, first_trk, last_trk, + cmd, basedev, startdev, + first_offs + 1, + trkcount, blksize, + (last_rec - first_rec + 1) * blksize, + tlf, blk_per_trk) == -EAGAIN) { + /* Clock not in sync and XRC is enabled. + * Try again later. + */ + ret = -EAGAIN; + goto out_error; + } + len_to_track_end = 0; + /* + * A tidaw can address 4k of memory, but must not cross page boundaries + * We can let the block layer handle this by setting + * blk_queue_segment_boundary to page boundaries and + * blk_max_segment_size to page size when setting up the request queue. + * For write requests, a TIDAW must not cross track boundaries, because + * we have to set the CBC flag on the last tidaw for each track. + */ + if (rq_data_dir(req) == WRITE) { + new_track = 1; + recid = first_rec; + rq_for_each_segment(bv, req, iter) { + dst = page_address(bv.bv_page) + bv.bv_offset; + seg_len = bv.bv_len; + while (seg_len) { + if (new_track) { + trkid = recid; + offs = sector_div(trkid, blk_per_trk); + count_to_trk_end = blk_per_trk - offs; + count = min((last_rec - recid + 1), + (sector_t)count_to_trk_end); + len_to_track_end = count * blksize; + recid += count; + new_track = 0; + } + part_len = min(seg_len, len_to_track_end); + seg_len -= part_len; + len_to_track_end -= part_len; + /* We need to end the tidaw at track end */ + if (!len_to_track_end) { + new_track = 1; + tidaw_flags = TIDAW_FLAGS_INSERT_CBC; + } else + tidaw_flags = 0; + last_tidaw = itcw_add_tidaw(itcw, tidaw_flags, + dst, part_len); + if (IS_ERR(last_tidaw)) { + ret = -EINVAL; + goto out_error; + } + dst += part_len; + } + } + } else { + rq_for_each_segment(bv, req, iter) { + dst = page_address(bv.bv_page) + bv.bv_offset; + last_tidaw = itcw_add_tidaw(itcw, 0x00, + dst, bv.bv_len); + if (IS_ERR(last_tidaw)) { + ret = -EINVAL; + goto out_error; + } + } + } + last_tidaw->flags |= TIDAW_FLAGS_LAST; + last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC; + itcw_finalize(itcw); + + if (blk_noretry_request(req) || + block->base->features & DASD_FEATURE_FAILFAST) + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + cqr->cpmode = 1; + cqr->startdev = startdev; + cqr->memdev = startdev; + cqr->block = block; + cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */ + cqr->lpm = dasd_path_get_ppm(startdev); + cqr->retries = startdev->default_retries; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + return cqr; +out_error: + dasd_sfree_request(cqr, startdev); + return ERR_PTR(ret); +} + +static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev, + struct dasd_block *block, + struct request *req) +{ + int cmdrtd, cmdwtd; + int use_prefix; + int fcx_multitrack; + struct dasd_eckd_private *private; + struct dasd_device *basedev; + sector_t first_rec, last_rec; + sector_t first_trk, last_trk; + unsigned int first_offs, last_offs; + unsigned int blk_per_trk, blksize; + int cdlspecial; + unsigned int data_size; + struct dasd_ccw_req *cqr; + + basedev = block->base; + private = basedev->private; + + /* Calculate number of blocks/records per track. */ + blksize = block->bp_block; + blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize); + if (blk_per_trk == 0) + return ERR_PTR(-EINVAL); + /* Calculate record id of first and last block. */ + first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift; + first_offs = sector_div(first_trk, blk_per_trk); + last_rec = last_trk = + (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; + last_offs = sector_div(last_trk, blk_per_trk); + cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk); + + fcx_multitrack = private->features.feature[40] & 0x20; + data_size = blk_rq_bytes(req); + if (data_size % blksize) + return ERR_PTR(-EINVAL); + /* tpm write request add CBC data on each track boundary */ + if (rq_data_dir(req) == WRITE) + data_size += (last_trk - first_trk) * 4; + + /* is read track data and write track data in command mode supported? */ + cmdrtd = private->features.feature[9] & 0x20; + cmdwtd = private->features.feature[12] & 0x40; + use_prefix = private->features.feature[8] & 0x01; + + cqr = NULL; + if (cdlspecial || dasd_page_cache) { + /* do nothing, just fall through to the cmd mode single case */ + } else if ((data_size <= private->fcx_max_data) + && (fcx_multitrack || (first_trk == last_trk))) { + cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req, + first_rec, last_rec, + first_trk, last_trk, + first_offs, last_offs, + blk_per_trk, blksize); + if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) && + (PTR_ERR(cqr) != -ENOMEM)) + cqr = NULL; + } else if (use_prefix && + (((rq_data_dir(req) == READ) && cmdrtd) || + ((rq_data_dir(req) == WRITE) && cmdwtd))) { + cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req, + first_rec, last_rec, + first_trk, last_trk, + first_offs, last_offs, + blk_per_trk, blksize); + if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) && + (PTR_ERR(cqr) != -ENOMEM)) + cqr = NULL; + } + if (!cqr) + cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req, + first_rec, last_rec, + first_trk, last_trk, + first_offs, last_offs, + blk_per_trk, blksize); + return cqr; +} + +static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev, + struct dasd_block *block, + struct request *req) +{ + sector_t start_padding_sectors, end_sector_offset, end_padding_sectors; + unsigned int seg_len, len_to_track_end; + unsigned int cidaw, cplength, datasize; + sector_t first_trk, last_trk, sectors; + struct dasd_eckd_private *base_priv; + struct dasd_device *basedev; + struct req_iterator iter; + struct dasd_ccw_req *cqr; + unsigned int first_offs; + unsigned int trkcount; + unsigned long *idaws; + unsigned int size; + unsigned char cmd; + struct bio_vec bv; + struct ccw1 *ccw; + int use_prefix; + void *data; + char *dst; + + /* + * raw track access needs to be mutiple of 64k and on 64k boundary + * For read requests we can fix an incorrect alignment by padding + * the request with dummy pages. + */ + start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK; + end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) % + DASD_RAW_SECTORS_PER_TRACK; + end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) % + DASD_RAW_SECTORS_PER_TRACK; + basedev = block->base; + if ((start_padding_sectors || end_padding_sectors) && + (rq_data_dir(req) == WRITE)) { + DBF_DEV_EVENT(DBF_ERR, basedev, + "raw write not track aligned (%lu,%lu) req %p", + start_padding_sectors, end_padding_sectors, req); + return ERR_PTR(-EINVAL); + } + + first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK; + last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) / + DASD_RAW_SECTORS_PER_TRACK; + trkcount = last_trk - first_trk + 1; + first_offs = 0; + + if (rq_data_dir(req) == READ) + cmd = DASD_ECKD_CCW_READ_TRACK; + else if (rq_data_dir(req) == WRITE) + cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK; + else + return ERR_PTR(-EINVAL); + + /* + * Raw track based I/O needs IDAWs for each page, + * and not just for 64 bit addresses. + */ + cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK; + + /* + * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes + * of extended parameter. This is needed for write full track. + */ + base_priv = basedev->private; + use_prefix = base_priv->features.feature[8] & 0x01; + if (use_prefix) { + cplength = 1 + trkcount; + size = sizeof(struct PFX_eckd_data) + 2; + } else { + cplength = 2 + trkcount; + size = sizeof(struct DE_eckd_data) + + sizeof(struct LRE_eckd_data) + 2; + } + size = ALIGN(size, 8); + + datasize = size + cidaw * sizeof(unsigned long); + + /* Allocate the ccw request. */ + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, + datasize, startdev, blk_mq_rq_to_pdu(req)); + if (IS_ERR(cqr)) + return cqr; + + ccw = cqr->cpaddr; + data = cqr->data; + + if (use_prefix) { + prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev, + startdev, 1, first_offs + 1, trkcount, 0, 0); + } else { + define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0); + ccw[-1].flags |= CCW_FLAG_CC; + + data += sizeof(struct DE_eckd_data); + locate_record_ext(ccw++, data, first_trk, first_offs + 1, + trkcount, cmd, basedev, 0, 0); + } + + idaws = (unsigned long *)(cqr->data + size); + len_to_track_end = 0; + if (start_padding_sectors) { + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = cmd; + /* maximum 3390 track size */ + ccw->count = 57326; + /* 64k map to one track */ + len_to_track_end = 65536 - start_padding_sectors * 512; + ccw->cda = (__u32)(addr_t)idaws; + ccw->flags |= CCW_FLAG_IDA; + ccw->flags |= CCW_FLAG_SLI; + ccw++; + for (sectors = 0; sectors < start_padding_sectors; sectors += 8) + idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE); + } + rq_for_each_segment(bv, req, iter) { + dst = page_address(bv.bv_page) + bv.bv_offset; + seg_len = bv.bv_len; + if (cmd == DASD_ECKD_CCW_READ_TRACK) + memset(dst, 0, seg_len); + if (!len_to_track_end) { + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = cmd; + /* maximum 3390 track size */ + ccw->count = 57326; + /* 64k map to one track */ + len_to_track_end = 65536; + ccw->cda = (__u32)(addr_t)idaws; + ccw->flags |= CCW_FLAG_IDA; + ccw->flags |= CCW_FLAG_SLI; + ccw++; + } + len_to_track_end -= seg_len; + idaws = idal_create_words(idaws, dst, seg_len); + } + for (sectors = 0; sectors < end_padding_sectors; sectors += 8) + idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE); + if (blk_noretry_request(req) || + block->base->features & DASD_FEATURE_FAILFAST) + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + cqr->startdev = startdev; + cqr->memdev = startdev; + cqr->block = block; + cqr->expires = startdev->default_expires * HZ; + cqr->lpm = dasd_path_get_ppm(startdev); + cqr->retries = startdev->default_retries; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + + return cqr; +} + + +static int +dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req) +{ + struct dasd_eckd_private *private; + struct ccw1 *ccw; + struct req_iterator iter; + struct bio_vec bv; + char *dst, *cda; + unsigned int blksize, blk_per_trk, off; + sector_t recid; + int status; + + if (!dasd_page_cache) + goto out; + private = cqr->block->base->private; + blksize = cqr->block->bp_block; + blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize); + recid = blk_rq_pos(req) >> cqr->block->s2b_shift; + ccw = cqr->cpaddr; + /* Skip over define extent & locate record. */ + ccw++; + if (private->uses_cdl == 0 || recid > 2*blk_per_trk) + ccw++; + rq_for_each_segment(bv, req, iter) { + dst = page_address(bv.bv_page) + bv.bv_offset; + for (off = 0; off < bv.bv_len; off += blksize) { + /* Skip locate record. */ + if (private->uses_cdl && recid <= 2*blk_per_trk) + ccw++; + if (dst) { + if (ccw->flags & CCW_FLAG_IDA) + cda = *((char **)((addr_t) ccw->cda)); + else + cda = (char *)((addr_t) ccw->cda); + if (dst != cda) { + if (rq_data_dir(req) == READ) + memcpy(dst, cda, bv.bv_len); + kmem_cache_free(dasd_page_cache, + (void *)((addr_t)cda & PAGE_MASK)); + } + dst = NULL; + } + ccw++; + recid++; + } + } +out: + status = cqr->status == DASD_CQR_DONE; + dasd_sfree_request(cqr, cqr->memdev); + return status; +} + +/* + * Modify ccw/tcw in cqr so it can be started on a base device. + * + * Note that this is not enough to restart the cqr! + * Either reset cqr->startdev as well (summary unit check handling) + * or restart via separate cqr (as in ERP handling). + */ +void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr) +{ + struct ccw1 *ccw; + struct PFX_eckd_data *pfxdata; + struct tcw *tcw; + struct tccb *tccb; + struct dcw *dcw; + + if (cqr->cpmode == 1) { + tcw = cqr->cpaddr; + tccb = tcw_get_tccb(tcw); + dcw = (struct dcw *)&tccb->tca[0]; + pfxdata = (struct PFX_eckd_data *)&dcw->cd[0]; + pfxdata->validity.verify_base = 0; + pfxdata->validity.hyper_pav = 0; + } else { + ccw = cqr->cpaddr; + pfxdata = cqr->data; + if (ccw->cmd_code == DASD_ECKD_CCW_PFX) { + pfxdata->validity.verify_base = 0; + pfxdata->validity.hyper_pav = 0; + } + } +} + +#define DASD_ECKD_CHANQ_MAX_SIZE 4 + +static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base, + struct dasd_block *block, + struct request *req) +{ + struct dasd_eckd_private *private; + struct dasd_device *startdev; + unsigned long flags; + struct dasd_ccw_req *cqr; + + startdev = dasd_alias_get_start_dev(base); + if (!startdev) + startdev = base; + private = startdev->private; + if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE) + return ERR_PTR(-EBUSY); + + spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags); + private->count++; + if ((base->features & DASD_FEATURE_USERAW)) + cqr = dasd_eckd_build_cp_raw(startdev, block, req); + else + cqr = dasd_eckd_build_cp(startdev, block, req); + if (IS_ERR(cqr)) + private->count--; + spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags); + return cqr; +} + +static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr, + struct request *req) +{ + struct dasd_eckd_private *private; + unsigned long flags; + + spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags); + private = cqr->memdev->private; + private->count--; + spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags); + return dasd_eckd_free_cp(cqr, req); +} + +static int +dasd_eckd_fill_info(struct dasd_device * device, + struct dasd_information2_t * info) +{ + struct dasd_eckd_private *private = device->private; + + info->label_block = 2; + info->FBA_layout = private->uses_cdl ? 0 : 1; + info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL; + info->characteristics_size = sizeof(private->rdc_data); + memcpy(info->characteristics, &private->rdc_data, + sizeof(private->rdc_data)); + info->confdata_size = min((unsigned long)private->conf_len, + sizeof(info->configuration_data)); + memcpy(info->configuration_data, private->conf_data, + info->confdata_size); + return 0; +} + +/* + * SECTION: ioctl functions for eckd devices. + */ + +/* + * Release device ioctl. + * Buils a channel programm to releases a prior reserved + * (see dasd_eckd_reserve) device. + */ +static int +dasd_eckd_release(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr; + int rc; + struct ccw1 *ccw; + int useglobal; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + useglobal = 0; + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL); + if (IS_ERR(cqr)) { + mutex_lock(&dasd_reserve_mutex); + useglobal = 1; + cqr = &dasd_reserve_req->cqr; + memset(cqr, 0, sizeof(*cqr)); + memset(&dasd_reserve_req->ccw, 0, + sizeof(dasd_reserve_req->ccw)); + cqr->cpaddr = &dasd_reserve_req->ccw; + cqr->data = &dasd_reserve_req->data; + cqr->magic = DASD_ECKD_MAGIC; + } + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_RELEASE; + ccw->flags |= CCW_FLAG_SLI; + ccw->count = 32; + ccw->cda = (__u32)(addr_t) cqr->data; + cqr->startdev = device; + cqr->memdev = device; + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + cqr->retries = 2; /* set retry counter to enable basic ERP */ + cqr->expires = 2 * HZ; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + + rc = dasd_sleep_on_immediatly(cqr); + if (!rc) + clear_bit(DASD_FLAG_IS_RESERVED, &device->flags); + + if (useglobal) + mutex_unlock(&dasd_reserve_mutex); + else + dasd_sfree_request(cqr, cqr->memdev); + return rc; +} + +/* + * Reserve device ioctl. + * Options are set to 'synchronous wait for interrupt' and + * 'timeout the request'. This leads to a terminate IO if + * the interrupt is outstanding for a certain time. + */ +static int +dasd_eckd_reserve(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr; + int rc; + struct ccw1 *ccw; + int useglobal; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + useglobal = 0; + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL); + if (IS_ERR(cqr)) { + mutex_lock(&dasd_reserve_mutex); + useglobal = 1; + cqr = &dasd_reserve_req->cqr; + memset(cqr, 0, sizeof(*cqr)); + memset(&dasd_reserve_req->ccw, 0, + sizeof(dasd_reserve_req->ccw)); + cqr->cpaddr = &dasd_reserve_req->ccw; + cqr->data = &dasd_reserve_req->data; + cqr->magic = DASD_ECKD_MAGIC; + } + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_RESERVE; + ccw->flags |= CCW_FLAG_SLI; + ccw->count = 32; + ccw->cda = (__u32)(addr_t) cqr->data; + cqr->startdev = device; + cqr->memdev = device; + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + cqr->retries = 2; /* set retry counter to enable basic ERP */ + cqr->expires = 2 * HZ; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + + rc = dasd_sleep_on_immediatly(cqr); + if (!rc) + set_bit(DASD_FLAG_IS_RESERVED, &device->flags); + + if (useglobal) + mutex_unlock(&dasd_reserve_mutex); + else + dasd_sfree_request(cqr, cqr->memdev); + return rc; +} + +/* + * Steal lock ioctl - unconditional reserve device. + * Buils a channel programm to break a device's reservation. + * (unconditional reserve) + */ +static int +dasd_eckd_steal_lock(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr; + int rc; + struct ccw1 *ccw; + int useglobal; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + useglobal = 0; + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL); + if (IS_ERR(cqr)) { + mutex_lock(&dasd_reserve_mutex); + useglobal = 1; + cqr = &dasd_reserve_req->cqr; + memset(cqr, 0, sizeof(*cqr)); + memset(&dasd_reserve_req->ccw, 0, + sizeof(dasd_reserve_req->ccw)); + cqr->cpaddr = &dasd_reserve_req->ccw; + cqr->data = &dasd_reserve_req->data; + cqr->magic = DASD_ECKD_MAGIC; + } + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_SLCK; + ccw->flags |= CCW_FLAG_SLI; + ccw->count = 32; + ccw->cda = (__u32)(addr_t) cqr->data; + cqr->startdev = device; + cqr->memdev = device; + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + cqr->retries = 2; /* set retry counter to enable basic ERP */ + cqr->expires = 2 * HZ; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + + rc = dasd_sleep_on_immediatly(cqr); + if (!rc) + set_bit(DASD_FLAG_IS_RESERVED, &device->flags); + + if (useglobal) + mutex_unlock(&dasd_reserve_mutex); + else + dasd_sfree_request(cqr, cqr->memdev); + return rc; +} + +/* + * SNID - Sense Path Group ID + * This ioctl may be used in situations where I/O is stalled due to + * a reserve, so if the normal dasd_smalloc_request fails, we use the + * preallocated dasd_reserve_req. + */ +static int dasd_eckd_snid(struct dasd_device *device, + void __user *argp) +{ + struct dasd_ccw_req *cqr; + int rc; + struct ccw1 *ccw; + int useglobal; + struct dasd_snid_ioctl_data usrparm; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (copy_from_user(&usrparm, argp, sizeof(usrparm))) + return -EFAULT; + + useglobal = 0; + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, + sizeof(struct dasd_snid_data), device, + NULL); + if (IS_ERR(cqr)) { + mutex_lock(&dasd_reserve_mutex); + useglobal = 1; + cqr = &dasd_reserve_req->cqr; + memset(cqr, 0, sizeof(*cqr)); + memset(&dasd_reserve_req->ccw, 0, + sizeof(dasd_reserve_req->ccw)); + cqr->cpaddr = &dasd_reserve_req->ccw; + cqr->data = &dasd_reserve_req->data; + cqr->magic = DASD_ECKD_MAGIC; + } + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_SNID; + ccw->flags |= CCW_FLAG_SLI; + ccw->count = 12; + ccw->cda = (__u32)(addr_t) cqr->data; + cqr->startdev = device; + cqr->memdev = device; + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags); + cqr->retries = 5; + cqr->expires = 10 * HZ; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + cqr->lpm = usrparm.path_mask; + + rc = dasd_sleep_on_immediatly(cqr); + /* verify that I/O processing didn't modify the path mask */ + if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask)) + rc = -EIO; + if (!rc) { + usrparm.data = *((struct dasd_snid_data *)cqr->data); + if (copy_to_user(argp, &usrparm, sizeof(usrparm))) + rc = -EFAULT; + } + + if (useglobal) + mutex_unlock(&dasd_reserve_mutex); + else + dasd_sfree_request(cqr, cqr->memdev); + return rc; +} + +/* + * Read performance statistics + */ +static int +dasd_eckd_performance(struct dasd_device *device, void __user *argp) +{ + struct dasd_psf_prssd_data *prssdp; + struct dasd_rssd_perf_stats_t *stats; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + int rc; + + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */, + (sizeof(struct dasd_psf_prssd_data) + + sizeof(struct dasd_rssd_perf_stats_t)), + device, NULL); + if (IS_ERR(cqr)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Could not allocate initialization request"); + return PTR_ERR(cqr); + } + cqr->startdev = device; + cqr->memdev = device; + cqr->retries = 0; + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + cqr->expires = 10 * HZ; + + /* Prepare for Read Subsystem Data */ + prssdp = (struct dasd_psf_prssd_data *) cqr->data; + memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data)); + prssdp->order = PSF_ORDER_PRSSD; + prssdp->suborder = 0x01; /* Performance Statistics */ + prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */ + + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_PSF; + ccw->count = sizeof(struct dasd_psf_prssd_data); + ccw->flags |= CCW_FLAG_CC; + ccw->cda = (__u32)(addr_t) prssdp; + + /* Read Subsystem Data - Performance Statistics */ + stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1); + memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t)); + + ccw++; + ccw->cmd_code = DASD_ECKD_CCW_RSSD; + ccw->count = sizeof(struct dasd_rssd_perf_stats_t); + ccw->cda = (__u32)(addr_t) stats; + + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + rc = dasd_sleep_on(cqr); + if (rc == 0) { + prssdp = (struct dasd_psf_prssd_data *) cqr->data; + stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1); + if (copy_to_user(argp, stats, + sizeof(struct dasd_rssd_perf_stats_t))) + rc = -EFAULT; + } + dasd_sfree_request(cqr, cqr->memdev); + return rc; +} + +/* + * Get attributes (cache operations) + * Returnes the cache attributes used in Define Extend (DE). + */ +static int +dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp) +{ + struct dasd_eckd_private *private = device->private; + struct attrib_data_t attrib = private->attrib; + int rc; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (!argp) + return -EINVAL; + + rc = 0; + if (copy_to_user(argp, (long *) &attrib, + sizeof(struct attrib_data_t))) + rc = -EFAULT; + + return rc; +} + +/* + * Set attributes (cache operations) + * Stores the attributes for cache operation to be used in Define Extend (DE). + */ +static int +dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp) +{ + struct dasd_eckd_private *private = device->private; + struct attrib_data_t attrib; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (!argp) + return -EINVAL; + + if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t))) + return -EFAULT; + private->attrib = attrib; + + dev_info(&device->cdev->dev, + "The DASD cache mode was set to %x (%i cylinder prestage)\n", + private->attrib.operation, private->attrib.nr_cyl); + return 0; +} + +/* + * Issue syscall I/O to EMC Symmetrix array. + * CCWs are PSF and RSSD + */ +static int dasd_symm_io(struct dasd_device *device, void __user *argp) +{ + struct dasd_symmio_parms usrparm; + char *psf_data, *rssd_result; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + char psf0, psf1; + int rc; + + if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO)) + return -EACCES; + psf0 = psf1 = 0; + + /* Copy parms from caller */ + rc = -EFAULT; + if (copy_from_user(&usrparm, argp, sizeof(usrparm))) + goto out; + if (is_compat_task()) { + /* Make sure pointers are sane even on 31 bit. */ + rc = -EINVAL; + if ((usrparm.psf_data >> 32) != 0) + goto out; + if ((usrparm.rssd_result >> 32) != 0) + goto out; + usrparm.psf_data &= 0x7fffffffULL; + usrparm.rssd_result &= 0x7fffffffULL; + } + /* at least 2 bytes are accessed and should be allocated */ + if (usrparm.psf_data_len < 2) { + DBF_DEV_EVENT(DBF_WARNING, device, + "Symmetrix ioctl invalid data length %d", + usrparm.psf_data_len); + rc = -EINVAL; + goto out; + } + /* alloc I/O data area */ + psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA); + rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA); + if (!psf_data || !rssd_result) { + rc = -ENOMEM; + goto out_free; + } + + /* get syscall header from user space */ + rc = -EFAULT; + if (copy_from_user(psf_data, + (void __user *)(unsigned long) usrparm.psf_data, + usrparm.psf_data_len)) + goto out_free; + psf0 = psf_data[0]; + psf1 = psf_data[1]; + + /* setup CCWs for PSF + RSSD */ + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL); + if (IS_ERR(cqr)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Could not allocate initialization request"); + rc = PTR_ERR(cqr); + goto out_free; + } + + cqr->startdev = device; + cqr->memdev = device; + cqr->retries = 3; + cqr->expires = 10 * HZ; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + + /* Build the ccws */ + ccw = cqr->cpaddr; + + /* PSF ccw */ + ccw->cmd_code = DASD_ECKD_CCW_PSF; + ccw->count = usrparm.psf_data_len; + ccw->flags |= CCW_FLAG_CC; + ccw->cda = (__u32)(addr_t) psf_data; + + ccw++; + + /* RSSD ccw */ + ccw->cmd_code = DASD_ECKD_CCW_RSSD; + ccw->count = usrparm.rssd_result_len; + ccw->flags = CCW_FLAG_SLI ; + ccw->cda = (__u32)(addr_t) rssd_result; + + rc = dasd_sleep_on(cqr); + if (rc) + goto out_sfree; + + rc = -EFAULT; + if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result, + rssd_result, usrparm.rssd_result_len)) + goto out_sfree; + rc = 0; + +out_sfree: + dasd_sfree_request(cqr, cqr->memdev); +out_free: + kfree(rssd_result); + kfree(psf_data); +out: + DBF_DEV_EVENT(DBF_WARNING, device, + "Symmetrix ioctl (0x%02x 0x%02x): rc=%d", + (int) psf0, (int) psf1, rc); + return rc; +} + +static int +dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp) +{ + struct dasd_device *device = block->base; + + switch (cmd) { + case BIODASDGATTR: + return dasd_eckd_get_attrib(device, argp); + case BIODASDSATTR: + return dasd_eckd_set_attrib(device, argp); + case BIODASDPSRD: + return dasd_eckd_performance(device, argp); + case BIODASDRLSE: + return dasd_eckd_release(device); + case BIODASDRSRV: + return dasd_eckd_reserve(device); + case BIODASDSLCK: + return dasd_eckd_steal_lock(device); + case BIODASDSNID: + return dasd_eckd_snid(device, argp); + case BIODASDSYMMIO: + return dasd_symm_io(device, argp); + default: + return -ENOTTY; + } +} + +/* + * Dump the range of CCWs into 'page' buffer + * and return number of printed chars. + */ +static int +dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page) +{ + int len, count; + char *datap; + + len = 0; + while (from <= to) { + len += sprintf(page + len, PRINTK_HEADER + " CCW %p: %08X %08X DAT:", + from, ((int *) from)[0], ((int *) from)[1]); + + /* get pointer to data (consider IDALs) */ + if (from->flags & CCW_FLAG_IDA) + datap = (char *) *((addr_t *) (addr_t) from->cda); + else + datap = (char *) ((addr_t) from->cda); + + /* dump data (max 32 bytes) */ + for (count = 0; count < from->count && count < 32; count++) { + if (count % 8 == 0) len += sprintf(page + len, " "); + if (count % 4 == 0) len += sprintf(page + len, " "); + len += sprintf(page + len, "%02x", datap[count]); + } + len += sprintf(page + len, "\n"); + from++; + } + return len; +} + +static void +dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb, + char *reason) +{ + u64 *sense; + u64 *stat; + + sense = (u64 *) dasd_get_sense(irb); + stat = (u64 *) &irb->scsw; + if (sense) { + DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : " + "%016llx %016llx %016llx %016llx", + reason, *stat, *((u32 *) (stat + 1)), + sense[0], sense[1], sense[2], sense[3]); + } else { + DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s", + reason, *stat, *((u32 *) (stat + 1)), + "NO VALID SENSE"); + } +} + +/* + * Print sense data and related channel program. + * Parts are printed because printk buffer is only 1024 bytes. + */ +static void dasd_eckd_dump_sense_ccw(struct dasd_device *device, + struct dasd_ccw_req *req, struct irb *irb) +{ + char *page; + struct ccw1 *first, *last, *fail, *from, *to; + int len, sl, sct; + + page = (char *) get_zeroed_page(GFP_ATOMIC); + if (page == NULL) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "No memory to dump sense data\n"); + return; + } + /* dump the sense data */ + len = sprintf(page, PRINTK_HEADER + " I/O status report for device %s:\n", + dev_name(&device->cdev->dev)); + len += sprintf(page + len, PRINTK_HEADER + " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X " + "CS:%02X RC:%d\n", + req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw), + scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw), + scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw), + req ? req->intrc : 0); + len += sprintf(page + len, PRINTK_HEADER + " device %s: Failing CCW: %p\n", + dev_name(&device->cdev->dev), + (void *) (addr_t) irb->scsw.cmd.cpa); + if (irb->esw.esw0.erw.cons) { + for (sl = 0; sl < 4; sl++) { + len += sprintf(page + len, PRINTK_HEADER + " Sense(hex) %2d-%2d:", + (8 * sl), ((8 * sl) + 7)); + + for (sct = 0; sct < 8; sct++) { + len += sprintf(page + len, " %02x", + irb->ecw[8 * sl + sct]); + } + len += sprintf(page + len, "\n"); + } + + if (irb->ecw[27] & DASD_SENSE_BIT_0) { + /* 24 Byte Sense Data */ + sprintf(page + len, PRINTK_HEADER + " 24 Byte: %x MSG %x, " + "%s MSGb to SYSOP\n", + irb->ecw[7] >> 4, irb->ecw[7] & 0x0f, + irb->ecw[1] & 0x10 ? "" : "no"); + } else { + /* 32 Byte Sense Data */ + sprintf(page + len, PRINTK_HEADER + " 32 Byte: Format: %x " + "Exception class %x\n", + irb->ecw[6] & 0x0f, irb->ecw[22] >> 4); + } + } else { + sprintf(page + len, PRINTK_HEADER + " SORRY - NO VALID SENSE AVAILABLE\n"); + } + printk(KERN_ERR "%s", page); + + if (req) { + /* req == NULL for unsolicited interrupts */ + /* dump the Channel Program (max 140 Bytes per line) */ + /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */ + first = req->cpaddr; + for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++); + to = min(first + 6, last); + len = sprintf(page, PRINTK_HEADER + " Related CP in req: %p\n", req); + dasd_eckd_dump_ccw_range(first, to, page + len); + printk(KERN_ERR "%s", page); + + /* print failing CCW area (maximum 4) */ + /* scsw->cda is either valid or zero */ + len = 0; + from = ++to; + fail = (struct ccw1 *)(addr_t) + irb->scsw.cmd.cpa; /* failing CCW */ + if (from < fail - 2) { + from = fail - 2; /* there is a gap - print header */ + len += sprintf(page, PRINTK_HEADER "......\n"); + } + to = min(fail + 1, last); + len += dasd_eckd_dump_ccw_range(from, to, page + len); + + /* print last CCWs (maximum 2) */ + from = max(from, ++to); + if (from < last - 1) { + from = last - 1; /* there is a gap - print header */ + len += sprintf(page + len, PRINTK_HEADER "......\n"); + } + len += dasd_eckd_dump_ccw_range(from, last, page + len); + if (len > 0) + printk(KERN_ERR "%s", page); + } + free_page((unsigned long) page); +} + + +/* + * Print sense data from a tcw. + */ +static void dasd_eckd_dump_sense_tcw(struct dasd_device *device, + struct dasd_ccw_req *req, struct irb *irb) +{ + char *page; + int len, sl, sct, residual; + struct tsb *tsb; + u8 *sense, *rcq; + + page = (char *) get_zeroed_page(GFP_ATOMIC); + if (page == NULL) { + DBF_DEV_EVENT(DBF_WARNING, device, " %s", + "No memory to dump sense data"); + return; + } + /* dump the sense data */ + len = sprintf(page, PRINTK_HEADER + " I/O status report for device %s:\n", + dev_name(&device->cdev->dev)); + len += sprintf(page + len, PRINTK_HEADER + " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X " + "CS:%02X fcxs:%02X schxs:%02X RC:%d\n", + req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw), + scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw), + scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw), + irb->scsw.tm.fcxs, + (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq, + req ? req->intrc : 0); + len += sprintf(page + len, PRINTK_HEADER + " device %s: Failing TCW: %p\n", + dev_name(&device->cdev->dev), + (void *) (addr_t) irb->scsw.tm.tcw); + + tsb = NULL; + sense = NULL; + if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01)) + tsb = tcw_get_tsb( + (struct tcw *)(unsigned long)irb->scsw.tm.tcw); + + if (tsb) { + len += sprintf(page + len, PRINTK_HEADER + " tsb->length %d\n", tsb->length); + len += sprintf(page + len, PRINTK_HEADER + " tsb->flags %x\n", tsb->flags); + len += sprintf(page + len, PRINTK_HEADER + " tsb->dcw_offset %d\n", tsb->dcw_offset); + len += sprintf(page + len, PRINTK_HEADER + " tsb->count %d\n", tsb->count); + residual = tsb->count - 28; + len += sprintf(page + len, PRINTK_HEADER + " residual %d\n", residual); + + switch (tsb->flags & 0x07) { + case 1: /* tsa_iostat */ + len += sprintf(page + len, PRINTK_HEADER + " tsb->tsa.iostat.dev_time %d\n", + tsb->tsa.iostat.dev_time); + len += sprintf(page + len, PRINTK_HEADER + " tsb->tsa.iostat.def_time %d\n", + tsb->tsa.iostat.def_time); + len += sprintf(page + len, PRINTK_HEADER + " tsb->tsa.iostat.queue_time %d\n", + tsb->tsa.iostat.queue_time); + len += sprintf(page + len, PRINTK_HEADER + " tsb->tsa.iostat.dev_busy_time %d\n", + tsb->tsa.iostat.dev_busy_time); + len += sprintf(page + len, PRINTK_HEADER + " tsb->tsa.iostat.dev_act_time %d\n", + tsb->tsa.iostat.dev_act_time); + sense = tsb->tsa.iostat.sense; + break; + case 2: /* ts_ddpc */ + len += sprintf(page + len, PRINTK_HEADER + " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc); + for (sl = 0; sl < 2; sl++) { + len += sprintf(page + len, PRINTK_HEADER + " tsb->tsa.ddpc.rcq %2d-%2d: ", + (8 * sl), ((8 * sl) + 7)); + rcq = tsb->tsa.ddpc.rcq; + for (sct = 0; sct < 8; sct++) { + len += sprintf(page + len, " %02x", + rcq[8 * sl + sct]); + } + len += sprintf(page + len, "\n"); + } + sense = tsb->tsa.ddpc.sense; + break; + case 3: /* tsa_intrg */ + len += sprintf(page + len, PRINTK_HEADER + " tsb->tsa.intrg.: not supported yet\n"); + break; + } + + if (sense) { + for (sl = 0; sl < 4; sl++) { + len += sprintf(page + len, PRINTK_HEADER + " Sense(hex) %2d-%2d:", + (8 * sl), ((8 * sl) + 7)); + for (sct = 0; sct < 8; sct++) { + len += sprintf(page + len, " %02x", + sense[8 * sl + sct]); + } + len += sprintf(page + len, "\n"); + } + + if (sense[27] & DASD_SENSE_BIT_0) { + /* 24 Byte Sense Data */ + sprintf(page + len, PRINTK_HEADER + " 24 Byte: %x MSG %x, " + "%s MSGb to SYSOP\n", + sense[7] >> 4, sense[7] & 0x0f, + sense[1] & 0x10 ? "" : "no"); + } else { + /* 32 Byte Sense Data */ + sprintf(page + len, PRINTK_HEADER + " 32 Byte: Format: %x " + "Exception class %x\n", + sense[6] & 0x0f, sense[22] >> 4); + } + } else { + sprintf(page + len, PRINTK_HEADER + " SORRY - NO VALID SENSE AVAILABLE\n"); + } + } else { + sprintf(page + len, PRINTK_HEADER + " SORRY - NO TSB DATA AVAILABLE\n"); + } + printk(KERN_ERR "%s", page); + free_page((unsigned long) page); +} + +static void dasd_eckd_dump_sense(struct dasd_device *device, + struct dasd_ccw_req *req, struct irb *irb) +{ + u8 *sense = dasd_get_sense(irb); + + if (scsw_is_tm(&irb->scsw)) { + /* + * In some cases the 'File Protected' or 'Incorrect Length' + * error might be expected and log messages shouldn't be written + * then. Check if the according suppress bit is set. + */ + if (sense && (sense[1] & SNS1_FILE_PROTECTED) && + test_bit(DASD_CQR_SUPPRESS_FP, &req->flags)) + return; + if (scsw_cstat(&irb->scsw) == 0x40 && + test_bit(DASD_CQR_SUPPRESS_IL, &req->flags)) + return; + + dasd_eckd_dump_sense_tcw(device, req, irb); + } else { + /* + * In some cases the 'Command Reject' or 'No Record Found' + * error might be expected and log messages shouldn't be + * written then. Check if the according suppress bit is set. + */ + if (sense && sense[0] & SNS0_CMD_REJECT && + test_bit(DASD_CQR_SUPPRESS_CR, &req->flags)) + return; + + if (sense && sense[1] & SNS1_NO_REC_FOUND && + test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags)) + return; + + dasd_eckd_dump_sense_ccw(device, req, irb); + } +} + +static int dasd_eckd_pm_freeze(struct dasd_device *device) +{ + /* + * the device should be disconnected from our LCU structure + * on restore we will reconnect it and reread LCU specific + * information like PAV support that might have changed + */ + dasd_alias_remove_device(device); + dasd_alias_disconnect_device_from_lcu(device); + + return 0; +} + +static int dasd_eckd_restore_device(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + struct dasd_eckd_characteristics temp_rdc_data; + int rc; + struct dasd_uid temp_uid; + unsigned long flags; + unsigned long cqr_flags = 0; + + /* Read Configuration Data */ + rc = dasd_eckd_read_conf(device); + if (rc) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, + "Read configuration data failed, rc=%d", rc); + goto out_err; + } + + dasd_eckd_get_uid(device, &temp_uid); + /* Generate device unique id */ + rc = dasd_eckd_generate_uid(device); + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0) + dev_err(&device->cdev->dev, "The UID of the DASD has " + "changed\n"); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + if (rc) + goto out_err; + + /* register lcu with alias handling, enable PAV if this is a new lcu */ + rc = dasd_alias_make_device_known_to_lcu(device); + if (rc) + goto out_err; + + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags); + dasd_eckd_validate_server(device, cqr_flags); + + /* RE-Read Configuration Data */ + rc = dasd_eckd_read_conf(device); + if (rc) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, + "Read configuration data failed, rc=%d", rc); + goto out_err2; + } + + /* Read Feature Codes */ + dasd_eckd_read_features(device); + + /* Read Device Characteristics */ + rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC, + &temp_rdc_data, 64); + if (rc) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, + "Read device characteristic failed, rc=%d", rc); + goto out_err2; + } + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data)); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + + /* add device to alias management */ + dasd_alias_add_device(device); + + return 0; + +out_err2: + dasd_alias_disconnect_device_from_lcu(device); +out_err: + return -1; +} + +static int dasd_eckd_reload_device(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + int rc, old_base; + char print_uid[60]; + struct dasd_uid uid; + unsigned long flags; + + /* + * remove device from alias handling to prevent new requests + * from being scheduled on the wrong alias device + */ + dasd_alias_remove_device(device); + + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + old_base = private->uid.base_unit_addr; + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + + /* Read Configuration Data */ + rc = dasd_eckd_read_conf(device); + if (rc) + goto out_err; + + rc = dasd_eckd_generate_uid(device); + if (rc) + goto out_err; + /* + * update unit address configuration and + * add device to alias management + */ + dasd_alias_update_add_device(device); + + dasd_eckd_get_uid(device, &uid); + + if (old_base != uid.base_unit_addr) { + if (strlen(uid.vduit) > 0) + snprintf(print_uid, sizeof(print_uid), + "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial, + uid.ssid, uid.base_unit_addr, uid.vduit); + else + snprintf(print_uid, sizeof(print_uid), + "%s.%s.%04x.%02x", uid.vendor, uid.serial, + uid.ssid, uid.base_unit_addr); + + dev_info(&device->cdev->dev, + "An Alias device was reassigned to a new base device " + "with UID: %s\n", print_uid); + } + return 0; + +out_err: + return -1; +} + +static int dasd_eckd_read_message_buffer(struct dasd_device *device, + struct dasd_rssd_messages *messages, + __u8 lpum) +{ + struct dasd_rssd_messages *message_buf; + struct dasd_psf_prssd_data *prssdp; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + int rc; + + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */, + (sizeof(struct dasd_psf_prssd_data) + + sizeof(struct dasd_rssd_messages)), + device, NULL); + if (IS_ERR(cqr)) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", + "Could not allocate read message buffer request"); + return PTR_ERR(cqr); + } + + cqr->lpm = lpum; +retry: + cqr->startdev = device; + cqr->memdev = device; + cqr->block = NULL; + cqr->expires = 10 * HZ; + set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags); + /* dasd_sleep_on_immediatly does not do complex error + * recovery so clear erp flag and set retry counter to + * do basic erp */ + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + cqr->retries = 256; + + /* Prepare for Read Subsystem Data */ + prssdp = (struct dasd_psf_prssd_data *) cqr->data; + memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data)); + prssdp->order = PSF_ORDER_PRSSD; + prssdp->suborder = 0x03; /* Message Buffer */ + /* all other bytes of prssdp must be zero */ + + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_PSF; + ccw->count = sizeof(struct dasd_psf_prssd_data); + ccw->flags |= CCW_FLAG_CC; + ccw->flags |= CCW_FLAG_SLI; + ccw->cda = (__u32)(addr_t) prssdp; + + /* Read Subsystem Data - message buffer */ + message_buf = (struct dasd_rssd_messages *) (prssdp + 1); + memset(message_buf, 0, sizeof(struct dasd_rssd_messages)); + + ccw++; + ccw->cmd_code = DASD_ECKD_CCW_RSSD; + ccw->count = sizeof(struct dasd_rssd_messages); + ccw->flags |= CCW_FLAG_SLI; + ccw->cda = (__u32)(addr_t) message_buf; + + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + rc = dasd_sleep_on_immediatly(cqr); + if (rc == 0) { + prssdp = (struct dasd_psf_prssd_data *) cqr->data; + message_buf = (struct dasd_rssd_messages *) + (prssdp + 1); + memcpy(messages, message_buf, + sizeof(struct dasd_rssd_messages)); + } else if (cqr->lpm) { + /* + * on z/VM we might not be able to do I/O on the requested path + * but instead we get the required information on any path + * so retry with open path mask + */ + cqr->lpm = 0; + goto retry; + } else + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, + "Reading messages failed with rc=%d\n" + , rc); + dasd_sfree_request(cqr, cqr->memdev); + return rc; +} + +static int dasd_eckd_query_host_access(struct dasd_device *device, + struct dasd_psf_query_host_access *data) +{ + struct dasd_eckd_private *private = device->private; + struct dasd_psf_query_host_access *host_access; + struct dasd_psf_prssd_data *prssdp; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + int rc; + + /* not available for HYPER PAV alias devices */ + if (!device->block && private->lcu->pav == HYPER_PAV) + return -EOPNOTSUPP; + + /* may not be supported by the storage server */ + if (!(private->features.feature[14] & 0x80)) + return -EOPNOTSUPP; + + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */, + sizeof(struct dasd_psf_prssd_data) + 1, + device, NULL); + if (IS_ERR(cqr)) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", + "Could not allocate read message buffer request"); + return PTR_ERR(cqr); + } + host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA); + if (!host_access) { + dasd_sfree_request(cqr, device); + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", + "Could not allocate host_access buffer"); + return -ENOMEM; + } + cqr->startdev = device; + cqr->memdev = device; + cqr->block = NULL; + cqr->retries = 256; + cqr->expires = 10 * HZ; + + /* Prepare for Read Subsystem Data */ + prssdp = (struct dasd_psf_prssd_data *) cqr->data; + memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data)); + prssdp->order = PSF_ORDER_PRSSD; + prssdp->suborder = PSF_SUBORDER_QHA; /* query host access */ + /* LSS and Volume that will be queried */ + prssdp->lss = private->ned->ID; + prssdp->volume = private->ned->unit_addr; + /* all other bytes of prssdp must be zero */ + + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_PSF; + ccw->count = sizeof(struct dasd_psf_prssd_data); + ccw->flags |= CCW_FLAG_CC; + ccw->flags |= CCW_FLAG_SLI; + ccw->cda = (__u32)(addr_t) prssdp; + + /* Read Subsystem Data - query host access */ + ccw++; + ccw->cmd_code = DASD_ECKD_CCW_RSSD; + ccw->count = sizeof(struct dasd_psf_query_host_access); + ccw->flags |= CCW_FLAG_SLI; + ccw->cda = (__u32)(addr_t) host_access; + + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + /* the command might not be supported, suppress error message */ + __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags); + rc = dasd_sleep_on_interruptible(cqr); + if (rc == 0) { + *data = *host_access; + } else { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, + "Reading host access data failed with rc=%d\n", + rc); + rc = -EOPNOTSUPP; + } + + dasd_sfree_request(cqr, cqr->memdev); + kfree(host_access); + return rc; +} +/* + * return number of grouped devices + */ +static int dasd_eckd_host_access_count(struct dasd_device *device) +{ + struct dasd_psf_query_host_access *access; + struct dasd_ckd_path_group_entry *entry; + struct dasd_ckd_host_information *info; + int count = 0; + int rc, i; + + access = kzalloc(sizeof(*access), GFP_NOIO); + if (!access) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", + "Could not allocate access buffer"); + return -ENOMEM; + } + rc = dasd_eckd_query_host_access(device, access); + if (rc) { + kfree(access); + return rc; + } + + info = (struct dasd_ckd_host_information *) + access->host_access_information; + for (i = 0; i < info->entry_count; i++) { + entry = (struct dasd_ckd_path_group_entry *) + (info->entry + i * info->entry_size); + if (entry->status_flags & DASD_ECKD_PG_GROUPED) + count++; + } + + kfree(access); + return count; +} + +/* + * write host access information to a sequential file + */ +static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m) +{ + struct dasd_psf_query_host_access *access; + struct dasd_ckd_path_group_entry *entry; + struct dasd_ckd_host_information *info; + char sysplex[9] = ""; + int rc, i; + + access = kzalloc(sizeof(*access), GFP_NOIO); + if (!access) { + DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", + "Could not allocate access buffer"); + return -ENOMEM; + } + rc = dasd_eckd_query_host_access(device, access); + if (rc) { + kfree(access); + return rc; + } + + info = (struct dasd_ckd_host_information *) + access->host_access_information; + for (i = 0; i < info->entry_count; i++) { + entry = (struct dasd_ckd_path_group_entry *) + (info->entry + i * info->entry_size); + /* PGID */ + seq_printf(m, "pgid %*phN\n", 11, entry->pgid); + /* FLAGS */ + seq_printf(m, "status_flags %02x\n", entry->status_flags); + /* SYSPLEX NAME */ + memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1); + EBCASC(sysplex, sizeof(sysplex)); + seq_printf(m, "sysplex_name %8s\n", sysplex); + /* SUPPORTED CYLINDER */ + seq_printf(m, "supported_cylinder %d\n", entry->cylinder); + /* TIMESTAMP */ + seq_printf(m, "timestamp %lu\n", (unsigned long) + entry->timestamp); + } + kfree(access); + + return 0; +} + +/* + * Perform Subsystem Function - CUIR response + */ +static int +dasd_eckd_psf_cuir_response(struct dasd_device *device, int response, + __u32 message_id, __u8 lpum) +{ + struct dasd_psf_cuir_response *psf_cuir; + int pos = pathmask_to_pos(lpum); + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + int rc; + + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ , + sizeof(struct dasd_psf_cuir_response), + device, NULL); + + if (IS_ERR(cqr)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Could not allocate PSF-CUIR request"); + return PTR_ERR(cqr); + } + + psf_cuir = (struct dasd_psf_cuir_response *)cqr->data; + psf_cuir->order = PSF_ORDER_CUIR_RESPONSE; + psf_cuir->cc = response; + psf_cuir->chpid = device->path[pos].chpid; + psf_cuir->message_id = message_id; + psf_cuir->cssid = device->path[pos].cssid; + psf_cuir->ssid = device->path[pos].ssid; + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_PSF; + ccw->cda = (__u32)(addr_t)psf_cuir; + ccw->flags = CCW_FLAG_SLI; + ccw->count = sizeof(struct dasd_psf_cuir_response); + + cqr->startdev = device; + cqr->memdev = device; + cqr->block = NULL; + cqr->retries = 256; + cqr->expires = 10*HZ; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags); + + rc = dasd_sleep_on(cqr); + + dasd_sfree_request(cqr, cqr->memdev); + return rc; +} + +/* + * return configuration data that is referenced by record selector + * if a record selector is specified or per default return the + * conf_data pointer for the path specified by lpum + */ +static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device, + __u8 lpum, + struct dasd_cuir_message *cuir) +{ + struct dasd_conf_data *conf_data; + int path, pos; + + if (cuir->record_selector == 0) + goto out; + for (path = 0x80, pos = 0; path; path >>= 1, pos++) { + conf_data = device->path[pos].conf_data; + if (conf_data->gneq.record_selector == + cuir->record_selector) + return conf_data; + } +out: + return device->path[pathmask_to_pos(lpum)].conf_data; +} + +/* + * This function determines the scope of a reconfiguration request by + * analysing the path and device selection data provided in the CUIR request. + * Returns a path mask containing CUIR affected paths for the give device. + * + * If the CUIR request does not contain the required information return the + * path mask of the path the attention message for the CUIR request was reveived + * on. + */ +static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum, + struct dasd_cuir_message *cuir) +{ + struct dasd_conf_data *ref_conf_data; + unsigned long bitmask = 0, mask = 0; + struct dasd_conf_data *conf_data; + unsigned int pos, path; + char *ref_gneq, *gneq; + char *ref_ned, *ned; + int tbcpm = 0; + + /* if CUIR request does not specify the scope use the path + the attention message was presented on */ + if (!cuir->ned_map || + !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2])) + return lpum; + + /* get reference conf data */ + ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir); + /* reference ned is determined by ned_map field */ + pos = 8 - ffs(cuir->ned_map); + ref_ned = (char *)&ref_conf_data->neds[pos]; + ref_gneq = (char *)&ref_conf_data->gneq; + /* transfer 24 bit neq_map to mask */ + mask = cuir->neq_map[2]; + mask |= cuir->neq_map[1] << 8; + mask |= cuir->neq_map[0] << 16; + + for (path = 0; path < 8; path++) { + /* initialise data per path */ + bitmask = mask; + conf_data = device->path[path].conf_data; + pos = 8 - ffs(cuir->ned_map); + ned = (char *) &conf_data->neds[pos]; + /* compare reference ned and per path ned */ + if (memcmp(ref_ned, ned, sizeof(*ned)) != 0) + continue; + gneq = (char *)&conf_data->gneq; + /* compare reference gneq and per_path gneq under + 24 bit mask where mask bit 0 equals byte 7 of + the gneq and mask bit 24 equals byte 31 */ + while (bitmask) { + pos = ffs(bitmask) - 1; + if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1) + != 0) + break; + clear_bit(pos, &bitmask); + } + if (bitmask) + continue; + /* device and path match the reference values + add path to CUIR scope */ + tbcpm |= 0x80 >> path; + } + return tbcpm; +} + +static void dasd_eckd_cuir_notify_user(struct dasd_device *device, + unsigned long paths, int action) +{ + int pos; + + while (paths) { + /* get position of bit in mask */ + pos = 8 - ffs(paths); + /* get channel path descriptor from this position */ + if (action == CUIR_QUIESCE) + pr_warn("Service on the storage server caused path %x.%02x to go offline", + device->path[pos].cssid, + device->path[pos].chpid); + else if (action == CUIR_RESUME) + pr_info("Path %x.%02x is back online after service on the storage server", + device->path[pos].cssid, + device->path[pos].chpid); + clear_bit(7 - pos, &paths); + } +} + +static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum, + struct dasd_cuir_message *cuir) +{ + unsigned long tbcpm; + + tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir); + /* nothing to do if path is not in use */ + if (!(dasd_path_get_opm(device) & tbcpm)) + return 0; + if (!(dasd_path_get_opm(device) & ~tbcpm)) { + /* no path would be left if the CUIR action is taken + return error */ + return -EINVAL; + } + /* remove device from operational path mask */ + dasd_path_remove_opm(device, tbcpm); + dasd_path_add_cuirpm(device, tbcpm); + return tbcpm; +} + +/* + * walk through all devices and build a path mask to quiesce them + * return an error if the last path to a device would be removed + * + * if only part of the devices are quiesced and an error + * occurs no onlining necessary, the storage server will + * notify the already set offline devices again + */ +static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum, + struct dasd_cuir_message *cuir) +{ + struct dasd_eckd_private *private = device->private; + struct alias_pav_group *pavgroup, *tempgroup; + struct dasd_device *dev, *n; + unsigned long paths = 0; + unsigned long flags; + int tbcpm; + + /* active devices */ + list_for_each_entry_safe(dev, n, &private->lcu->active_devices, + alias_list) { + spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags); + tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir); + spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags); + if (tbcpm < 0) + goto out_err; + paths |= tbcpm; + } + /* inactive devices */ + list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices, + alias_list) { + spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags); + tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir); + spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags); + if (tbcpm < 0) + goto out_err; + paths |= tbcpm; + } + /* devices in PAV groups */ + list_for_each_entry_safe(pavgroup, tempgroup, + &private->lcu->grouplist, group) { + list_for_each_entry_safe(dev, n, &pavgroup->baselist, + alias_list) { + spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags); + tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir); + spin_unlock_irqrestore( + get_ccwdev_lock(dev->cdev), flags); + if (tbcpm < 0) + goto out_err; + paths |= tbcpm; + } + list_for_each_entry_safe(dev, n, &pavgroup->aliaslist, + alias_list) { + spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags); + tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir); + spin_unlock_irqrestore( + get_ccwdev_lock(dev->cdev), flags); + if (tbcpm < 0) + goto out_err; + paths |= tbcpm; + } + } + /* notify user about all paths affected by CUIR action */ + dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE); + return 0; +out_err: + return tbcpm; +} + +static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum, + struct dasd_cuir_message *cuir) +{ + struct dasd_eckd_private *private = device->private; + struct alias_pav_group *pavgroup, *tempgroup; + struct dasd_device *dev, *n; + unsigned long paths = 0; + int tbcpm; + + /* + * the path may have been added through a generic path event before + * only trigger path verification if the path is not already in use + */ + list_for_each_entry_safe(dev, n, + &private->lcu->active_devices, + alias_list) { + tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir); + paths |= tbcpm; + if (!(dasd_path_get_opm(dev) & tbcpm)) { + dasd_path_add_tbvpm(dev, tbcpm); + dasd_schedule_device_bh(dev); + } + } + list_for_each_entry_safe(dev, n, + &private->lcu->inactive_devices, + alias_list) { + tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir); + paths |= tbcpm; + if (!(dasd_path_get_opm(dev) & tbcpm)) { + dasd_path_add_tbvpm(dev, tbcpm); + dasd_schedule_device_bh(dev); + } + } + /* devices in PAV groups */ + list_for_each_entry_safe(pavgroup, tempgroup, + &private->lcu->grouplist, + group) { + list_for_each_entry_safe(dev, n, + &pavgroup->baselist, + alias_list) { + tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir); + paths |= tbcpm; + if (!(dasd_path_get_opm(dev) & tbcpm)) { + dasd_path_add_tbvpm(dev, tbcpm); + dasd_schedule_device_bh(dev); + } + } + list_for_each_entry_safe(dev, n, + &pavgroup->aliaslist, + alias_list) { + tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir); + paths |= tbcpm; + if (!(dasd_path_get_opm(dev) & tbcpm)) { + dasd_path_add_tbvpm(dev, tbcpm); + dasd_schedule_device_bh(dev); + } + } + } + /* notify user about all paths affected by CUIR action */ + dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME); + return 0; +} + +static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages, + __u8 lpum) +{ + struct dasd_cuir_message *cuir = messages; + int response; + + DBF_DEV_EVENT(DBF_WARNING, device, + "CUIR request: %016llx %016llx %016llx %08x", + ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2], + ((u32 *)cuir)[3]); + + if (cuir->code == CUIR_QUIESCE) { + /* quiesce */ + if (dasd_eckd_cuir_quiesce(device, lpum, cuir)) + response = PSF_CUIR_LAST_PATH; + else + response = PSF_CUIR_COMPLETED; + } else if (cuir->code == CUIR_RESUME) { + /* resume */ + dasd_eckd_cuir_resume(device, lpum, cuir); + response = PSF_CUIR_COMPLETED; + } else + response = PSF_CUIR_NOT_SUPPORTED; + + dasd_eckd_psf_cuir_response(device, response, + cuir->message_id, lpum); + DBF_DEV_EVENT(DBF_WARNING, device, + "CUIR response: %d on message ID %08x", response, + cuir->message_id); + /* to make sure there is no attention left schedule work again */ + device->discipline->check_attention(device, lpum); +} + +static void dasd_eckd_check_attention_work(struct work_struct *work) +{ + struct check_attention_work_data *data; + struct dasd_rssd_messages *messages; + struct dasd_device *device; + int rc; + + data = container_of(work, struct check_attention_work_data, worker); + device = data->device; + messages = kzalloc(sizeof(*messages), GFP_KERNEL); + if (!messages) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Could not allocate attention message buffer"); + goto out; + } + rc = dasd_eckd_read_message_buffer(device, messages, data->lpum); + if (rc) + goto out; + if (messages->length == ATTENTION_LENGTH_CUIR && + messages->format == ATTENTION_FORMAT_CUIR) + dasd_eckd_handle_cuir(device, messages, data->lpum); +out: + dasd_put_device(device); + kfree(messages); + kfree(data); +} + +static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum) +{ + struct check_attention_work_data *data; + + data = kzalloc(sizeof(*data), GFP_ATOMIC); + if (!data) + return -ENOMEM; + INIT_WORK(&data->worker, dasd_eckd_check_attention_work); + dasd_get_device(device); + data->device = device; + data->lpum = lpum; + schedule_work(&data->worker); + return 0; +} + +static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum) +{ + if (~lpum & dasd_path_get_opm(device)) { + dasd_path_add_nohpfpm(device, lpum); + dasd_path_remove_opm(device, lpum); + dev_err(&device->cdev->dev, + "Channel path %02X lost HPF functionality and is disabled\n", + lpum); + return 1; + } + return 0; +} + +static void dasd_eckd_disable_hpf_device(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + + dev_err(&device->cdev->dev, + "High Performance FICON disabled\n"); + private->fcx_max_data = 0; +} + +static int dasd_eckd_hpf_enabled(struct dasd_device *device) +{ + struct dasd_eckd_private *private = device->private; + + return private->fcx_max_data ? 1 : 0; +} + +static void dasd_eckd_handle_hpf_error(struct dasd_device *device, + struct irb *irb) +{ + struct dasd_eckd_private *private = device->private; + + if (!private->fcx_max_data) { + /* sanity check for no HPF, the error makes no sense */ + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "Trying to disable HPF for a non HPF device"); + return; + } + if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) { + dasd_eckd_disable_hpf_device(device); + } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) { + if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum)) + return; + dasd_eckd_disable_hpf_device(device); + dasd_path_set_tbvpm(device, + dasd_path_get_hpfpm(device)); + } + /* + * prevent that any new I/O ist started on the device and schedule a + * requeue of existing requests + */ + dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC); + dasd_schedule_requeue(device); +} + +static struct ccw_driver dasd_eckd_driver = { + .driver = { + .name = "dasd-eckd", + .owner = THIS_MODULE, + }, + .ids = dasd_eckd_ids, + .probe = dasd_eckd_probe, + .remove = dasd_generic_remove, + .set_offline = dasd_generic_set_offline, + .set_online = dasd_eckd_set_online, + .notify = dasd_generic_notify, + .path_event = dasd_generic_path_event, + .shutdown = dasd_generic_shutdown, + .freeze = dasd_generic_pm_freeze, + .thaw = dasd_generic_restore_device, + .restore = dasd_generic_restore_device, + .uc_handler = dasd_generic_uc_handler, + .int_class = IRQIO_DAS, +}; + +/* + * max_blocks is dependent on the amount of storage that is available + * in the static io buffer for each device. Currently each device has + * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has + * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use + * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In + * addition we have one define extent ccw + 16 bytes of data and one + * locate record ccw + 16 bytes of data. That makes: + * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum. + * We want to fit two into the available memory so that we can immediately + * start the next request if one finishes off. That makes 249.5 blocks + * for one request. Give a little safety and the result is 240. + */ +static struct dasd_discipline dasd_eckd_discipline = { + .owner = THIS_MODULE, + .name = "ECKD", + .ebcname = "ECKD", + .max_blocks = 190, + .check_device = dasd_eckd_check_characteristics, + .uncheck_device = dasd_eckd_uncheck_device, + .do_analysis = dasd_eckd_do_analysis, + .verify_path = dasd_eckd_verify_path, + .basic_to_ready = dasd_eckd_basic_to_ready, + .online_to_ready = dasd_eckd_online_to_ready, + .basic_to_known = dasd_eckd_basic_to_known, + .fill_geometry = dasd_eckd_fill_geometry, + .start_IO = dasd_start_IO, + .term_IO = dasd_term_IO, + .handle_terminated_request = dasd_eckd_handle_terminated_request, + .format_device = dasd_eckd_format_device, + .check_device_format = dasd_eckd_check_device_format, + .erp_action = dasd_eckd_erp_action, + .erp_postaction = dasd_eckd_erp_postaction, + .check_for_device_change = dasd_eckd_check_for_device_change, + .build_cp = dasd_eckd_build_alias_cp, + .free_cp = dasd_eckd_free_alias_cp, + .dump_sense = dasd_eckd_dump_sense, + .dump_sense_dbf = dasd_eckd_dump_sense_dbf, + .fill_info = dasd_eckd_fill_info, + .ioctl = dasd_eckd_ioctl, + .freeze = dasd_eckd_pm_freeze, + .restore = dasd_eckd_restore_device, + .reload = dasd_eckd_reload_device, + .get_uid = dasd_eckd_get_uid, + .kick_validate = dasd_eckd_kick_validate_server, + .check_attention = dasd_eckd_check_attention, + .host_access_count = dasd_eckd_host_access_count, + .hosts_print = dasd_hosts_print, + .handle_hpf_error = dasd_eckd_handle_hpf_error, + .disable_hpf = dasd_eckd_disable_hpf_device, + .hpf_enabled = dasd_eckd_hpf_enabled, + .reset_path = dasd_eckd_reset_path, +}; + +static int __init +dasd_eckd_init(void) +{ + int ret; + + ASCEBC(dasd_eckd_discipline.ebcname, 4); + dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req), + GFP_KERNEL | GFP_DMA); + if (!dasd_reserve_req) + return -ENOMEM; + path_verification_worker = kmalloc(sizeof(*path_verification_worker), + GFP_KERNEL | GFP_DMA); + if (!path_verification_worker) { + kfree(dasd_reserve_req); + return -ENOMEM; + } + rawpadpage = (void *)__get_free_page(GFP_KERNEL); + if (!rawpadpage) { + kfree(path_verification_worker); + kfree(dasd_reserve_req); + return -ENOMEM; + } + ret = ccw_driver_register(&dasd_eckd_driver); + if (!ret) + wait_for_device_probe(); + else { + kfree(path_verification_worker); + kfree(dasd_reserve_req); + free_page((unsigned long)rawpadpage); + } + return ret; +} + +static void __exit +dasd_eckd_cleanup(void) +{ + ccw_driver_unregister(&dasd_eckd_driver); + kfree(path_verification_worker); + kfree(dasd_reserve_req); + free_page((unsigned long)rawpadpage); +} + +module_init(dasd_eckd_init); +module_exit(dasd_eckd_cleanup); diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h new file mode 100644 index 000000000..5869d2fed --- /dev/null +++ b/drivers/s390/block/dasd_eckd.h @@ -0,0 +1,578 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Author(s)......: Holger Smolinski + * Horst Hummel + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2000 + * + */ + +#ifndef DASD_ECKD_H +#define DASD_ECKD_H + +/***************************************************************************** + * SECTION: CCW Definitions + ****************************************************************************/ +#define DASD_ECKD_CCW_WRITE 0x05 +#define DASD_ECKD_CCW_READ 0x06 +#define DASD_ECKD_CCW_WRITE_HOME_ADDRESS 0x09 +#define DASD_ECKD_CCW_READ_HOME_ADDRESS 0x0a +#define DASD_ECKD_CCW_WRITE_KD 0x0d +#define DASD_ECKD_CCW_READ_KD 0x0e +#define DASD_ECKD_CCW_ERASE 0x11 +#define DASD_ECKD_CCW_READ_COUNT 0x12 +#define DASD_ECKD_CCW_SLCK 0x14 +#define DASD_ECKD_CCW_WRITE_RECORD_ZERO 0x15 +#define DASD_ECKD_CCW_READ_RECORD_ZERO 0x16 +#define DASD_ECKD_CCW_WRITE_CKD 0x1d +#define DASD_ECKD_CCW_READ_CKD 0x1e +#define DASD_ECKD_CCW_PSF 0x27 +#define DASD_ECKD_CCW_SNID 0x34 +#define DASD_ECKD_CCW_RSSD 0x3e +#define DASD_ECKD_CCW_LOCATE_RECORD 0x47 +#define DASD_ECKD_CCW_LOCATE_RECORD_EXT 0x4b +#define DASD_ECKD_CCW_SNSS 0x54 +#define DASD_ECKD_CCW_DEFINE_EXTENT 0x63 +#define DASD_ECKD_CCW_WRITE_MT 0x85 +#define DASD_ECKD_CCW_READ_MT 0x86 +#define DASD_ECKD_CCW_WRITE_KD_MT 0x8d +#define DASD_ECKD_CCW_READ_KD_MT 0x8e +#define DASD_ECKD_CCW_READ_COUNT_MT 0x92 +#define DASD_ECKD_CCW_RELEASE 0x94 +#define DASD_ECKD_CCW_WRITE_FULL_TRACK 0x95 +#define DASD_ECKD_CCW_READ_CKD_MT 0x9e +#define DASD_ECKD_CCW_WRITE_CKD_MT 0x9d +#define DASD_ECKD_CCW_WRITE_TRACK_DATA 0xA5 +#define DASD_ECKD_CCW_READ_TRACK_DATA 0xA6 +#define DASD_ECKD_CCW_RESERVE 0xB4 +#define DASD_ECKD_CCW_READ_TRACK 0xDE +#define DASD_ECKD_CCW_PFX 0xE7 +#define DASD_ECKD_CCW_PFX_READ 0xEA +#define DASD_ECKD_CCW_RSCK 0xF9 +#define DASD_ECKD_CCW_RCD 0xFA + +/* + * Perform Subsystem Function / Sub-Orders + */ +#define PSF_ORDER_PRSSD 0x18 +#define PSF_ORDER_CUIR_RESPONSE 0x1A +#define PSF_SUBORDER_QHA 0x1C +#define PSF_ORDER_SSC 0x1D + +/* + * CUIR response condition codes + */ +#define PSF_CUIR_INVALID 0x00 +#define PSF_CUIR_COMPLETED 0x01 +#define PSF_CUIR_NOT_SUPPORTED 0x02 +#define PSF_CUIR_ERROR_IN_REQ 0x03 +#define PSF_CUIR_DENIED 0x04 +#define PSF_CUIR_LAST_PATH 0x05 +#define PSF_CUIR_DEVICE_ONLINE 0x06 +#define PSF_CUIR_VARY_FAILURE 0x07 +#define PSF_CUIR_SOFTWARE_FAILURE 0x08 +#define PSF_CUIR_NOT_RECOGNIZED 0x09 + +/* + * CUIR codes + */ +#define CUIR_QUIESCE 0x01 +#define CUIR_RESUME 0x02 + +/* + * attention message definitions + */ +#define ATTENTION_LENGTH_CUIR 0x0e +#define ATTENTION_FORMAT_CUIR 0x01 + +#define DASD_ECKD_PG_GROUPED 0x10 + +/* + * Size that is reportet for large volumes in the old 16-bit no_cyl field + */ +#define LV_COMPAT_CYL 0xFFFE + + +#define FCX_MAX_DATA_FACTOR 65536 +#define DASD_ECKD_RCD_DATA_SIZE 256 + +#define DASD_ECKD_PATH_THRHLD 256 +#define DASD_ECKD_PATH_INTERVAL 300 + +/***************************************************************************** + * SECTION: Type Definitions + ****************************************************************************/ + +struct eckd_count { + __u16 cyl; + __u16 head; + __u8 record; + __u8 kl; + __u16 dl; +} __attribute__ ((packed)); + +struct ch_t { + __u16 cyl; + __u16 head; +} __attribute__ ((packed)); + +struct chs_t { + __u16 cyl; + __u16 head; + __u32 sector; +} __attribute__ ((packed)); + +struct chr_t { + __u16 cyl; + __u16 head; + __u8 record; +} __attribute__ ((packed)); + +struct geom_t { + __u16 cyl; + __u16 head; + __u32 sector; +} __attribute__ ((packed)); + +struct eckd_home { + __u8 skip_control[14]; + __u16 cell_number; + __u8 physical_addr[3]; + __u8 flag; + struct ch_t track_addr; + __u8 reserved; + __u8 key_length; + __u8 reserved2[2]; +} __attribute__ ((packed)); + +struct DE_eckd_data { + struct { + unsigned char perm:2; /* Permissions on this extent */ + unsigned char reserved:1; + unsigned char seek:2; /* Seek control */ + unsigned char auth:2; /* Access authorization */ + unsigned char pci:1; /* PCI Fetch mode */ + } __attribute__ ((packed)) mask; + struct { + unsigned char mode:2; /* Architecture mode */ + unsigned char ckd:1; /* CKD Conversion */ + unsigned char operation:3; /* Operation mode */ + unsigned char cfw:1; /* Cache fast write */ + unsigned char dfw:1; /* DASD fast write */ + } __attribute__ ((packed)) attributes; + __u16 blk_size; /* Blocksize */ + __u16 fast_write_id; + __u8 ga_additional; /* Global Attributes Additional */ + __u8 ga_extended; /* Global Attributes Extended */ + struct ch_t beg_ext; + struct ch_t end_ext; + unsigned long ep_sys_time; /* Ext Parameter - System Time Stamp */ + __u8 ep_format; /* Extended Parameter format byte */ + __u8 ep_prio; /* Extended Parameter priority I/O byte */ + __u8 ep_reserved1; /* Extended Parameter Reserved */ + __u8 ep_rec_per_track; /* Number of records on a track */ + __u8 ep_reserved[4]; /* Extended Parameter Reserved */ +} __attribute__ ((packed)); + +struct LO_eckd_data { + struct { + unsigned char orientation:2; + unsigned char operation:6; + } __attribute__ ((packed)) operation; + struct { + unsigned char last_bytes_used:1; + unsigned char reserved:6; + unsigned char read_count_suffix:1; + } __attribute__ ((packed)) auxiliary; + __u8 unused; + __u8 count; + struct ch_t seek_addr; + struct chr_t search_arg; + __u8 sector; + __u16 length; +} __attribute__ ((packed)); + +struct LRE_eckd_data { + struct { + unsigned char orientation:2; + unsigned char operation:6; + } __attribute__ ((packed)) operation; + struct { + unsigned char length_valid:1; + unsigned char length_scope:1; + unsigned char imbedded_ccw_valid:1; + unsigned char check_bytes:2; + unsigned char imbedded_count_valid:1; + unsigned char reserved:1; + unsigned char read_count_suffix:1; + } __attribute__ ((packed)) auxiliary; + __u8 imbedded_ccw; + __u8 count; + struct ch_t seek_addr; + struct chr_t search_arg; + __u8 sector; + __u16 length; + __u8 imbedded_count; + __u8 extended_operation; + __u16 extended_parameter_length; + __u8 extended_parameter[0]; +} __attribute__ ((packed)); + +/* Prefix data for format 0x00 and 0x01 */ +struct PFX_eckd_data { + unsigned char format; + struct { + unsigned char define_extent:1; + unsigned char time_stamp:1; + unsigned char verify_base:1; + unsigned char hyper_pav:1; + unsigned char reserved:4; + } __attribute__ ((packed)) validity; + __u8 base_address; + __u8 aux; + __u8 base_lss; + __u8 reserved[7]; + struct DE_eckd_data define_extent; + struct LRE_eckd_data locate_record; +} __attribute__ ((packed)); + +struct dasd_eckd_characteristics { + __u16 cu_type; + struct { + unsigned char support:2; + unsigned char async:1; + unsigned char reserved:1; + unsigned char cache_info:1; + unsigned char model:3; + } __attribute__ ((packed)) cu_model; + __u16 dev_type; + __u8 dev_model; + struct { + unsigned char mult_burst:1; + unsigned char RT_in_LR:1; + unsigned char reserved1:1; + unsigned char RD_IN_LR:1; + unsigned char reserved2:4; + unsigned char reserved3:8; + unsigned char defect_wr:1; + unsigned char XRC_supported:1; + unsigned char reserved4:1; + unsigned char striping:1; + unsigned char reserved5:4; + unsigned char cfw:1; + unsigned char reserved6:2; + unsigned char cache:1; + unsigned char dual_copy:1; + unsigned char dfw:1; + unsigned char reset_alleg:1; + unsigned char sense_down:1; + } __attribute__ ((packed)) facilities; + __u8 dev_class; + __u8 unit_type; + __u16 no_cyl; + __u16 trk_per_cyl; + __u8 sec_per_trk; + __u8 byte_per_track[3]; + __u16 home_bytes; + __u8 formula; + union { + struct { + __u8 f1; + __u16 f2; + __u16 f3; + } __attribute__ ((packed)) f_0x01; + struct { + __u8 f1; + __u8 f2; + __u8 f3; + __u8 f4; + __u8 f5; + } __attribute__ ((packed)) f_0x02; + } __attribute__ ((packed)) factors; + __u16 first_alt_trk; + __u16 no_alt_trk; + __u16 first_dia_trk; + __u16 no_dia_trk; + __u16 first_sup_trk; + __u16 no_sup_trk; + __u8 MDR_ID; + __u8 OBR_ID; + __u8 director; + __u8 rd_trk_set; + __u16 max_rec_zero; + __u8 reserved1; + __u8 RWANY_in_LR; + __u8 factor6; + __u8 factor7; + __u8 factor8; + __u8 reserved2[3]; + __u8 reserved3[6]; + __u32 long_no_cyl; +} __attribute__ ((packed)); + +/* elements of the configuration data */ +struct dasd_ned { + struct { + __u8 identifier:2; + __u8 token_id:1; + __u8 sno_valid:1; + __u8 subst_sno:1; + __u8 recNED:1; + __u8 emuNED:1; + __u8 reserved:1; + } __attribute__ ((packed)) flags; + __u8 descriptor; + __u8 dev_class; + __u8 reserved; + __u8 dev_type[6]; + __u8 dev_model[3]; + __u8 HDA_manufacturer[3]; + __u8 HDA_location[2]; + __u8 HDA_seqno[12]; + __u8 ID; + __u8 unit_addr; +} __attribute__ ((packed)); + +struct dasd_sneq { + struct { + __u8 identifier:2; + __u8 reserved:6; + } __attribute__ ((packed)) flags; + __u8 res1; + __u16 format; + __u8 res2[4]; /* byte 4- 7 */ + __u8 sua_flags; /* byte 8 */ + __u8 base_unit_addr; /* byte 9 */ + __u8 res3[22]; /* byte 10-31 */ +} __attribute__ ((packed)); + +struct vd_sneq { + struct { + __u8 identifier:2; + __u8 reserved:6; + } __attribute__ ((packed)) flags; + __u8 res1; + __u16 format; + __u8 res2[4]; /* byte 4- 7 */ + __u8 uit[16]; /* byte 8-23 */ + __u8 res3[8]; /* byte 24-31 */ +} __attribute__ ((packed)); + +struct dasd_gneq { + struct { + __u8 identifier:2; + __u8 reserved:6; + } __attribute__ ((packed)) flags; + __u8 record_selector; + __u8 reserved[4]; + struct { + __u8 value:2; + __u8 number:6; + } __attribute__ ((packed)) timeout; + __u8 reserved3; + __u16 subsystemID; + __u8 reserved2[22]; +} __attribute__ ((packed)); + +struct dasd_rssd_features { + char feature[256]; +} __attribute__((packed)); + +struct dasd_rssd_messages { + __u16 length; + __u8 format; + __u8 code; + __u32 message_id; + __u8 flags; + char messages[4087]; +} __packed; + +struct dasd_cuir_message { + __u16 length; + __u8 format; + __u8 code; + __u32 message_id; + __u8 flags; + __u8 neq_map[3]; + __u8 ned_map; + __u8 record_selector; +} __packed; + +struct dasd_psf_cuir_response { + __u8 order; + __u8 flags; + __u8 cc; + __u8 chpid; + __u16 device_nr; + __u16 reserved; + __u32 message_id; + __u64 system_id; + __u8 cssid; + __u8 ssid; +} __packed; + +struct dasd_ckd_path_group_entry { + __u8 status_flags; + __u8 pgid[11]; + __u8 sysplex_name[8]; + __u32 timestamp; + __u32 cylinder; + __u8 reserved[4]; +} __packed; + +struct dasd_ckd_host_information { + __u8 access_flags; + __u8 entry_size; + __u16 entry_count; + __u8 entry[16390]; +} __packed; + +struct dasd_psf_query_host_access { + __u8 access_flag; + __u8 version; + __u16 CKD_length; + __u16 SCSI_length; + __u8 unused[10]; + __u8 host_access_information[16394]; +} __packed; + +/* + * Perform Subsystem Function - Prepare for Read Subsystem Data + */ +struct dasd_psf_prssd_data { + unsigned char order; + unsigned char flags; + unsigned char reserved1; + unsigned char reserved2; + unsigned char lss; + unsigned char volume; + unsigned char suborder; + unsigned char varies[5]; +} __attribute__ ((packed)); + +/* + * Perform Subsystem Function - Set Subsystem Characteristics + */ +struct dasd_psf_ssc_data { + unsigned char order; + unsigned char flags; + unsigned char cu_type[4]; + unsigned char suborder; + unsigned char reserved[59]; +} __attribute__((packed)); + + +/* + * some structures and definitions for alias handling + */ +struct dasd_unit_address_configuration { + struct { + char ua_type; + char base_ua; + } unit[256]; +} __attribute__((packed)); + + +#define MAX_DEVICES_PER_LCU 256 + +/* flags on the LCU */ +#define NEED_UAC_UPDATE 0x01 +#define UPDATE_PENDING 0x02 + +enum pavtype {NO_PAV, BASE_PAV, HYPER_PAV}; + + +struct alias_root { + struct list_head serverlist; + spinlock_t lock; +}; + +struct alias_server { + struct list_head server; + struct dasd_uid uid; + struct list_head lculist; +}; + +struct summary_unit_check_work_data { + char reason; + struct dasd_device *device; + struct work_struct worker; +}; + +struct read_uac_work_data { + struct dasd_device *device; + struct delayed_work dwork; +}; + +struct alias_lcu { + struct list_head lcu; + struct dasd_uid uid; + enum pavtype pav; + char flags; + spinlock_t lock; + struct list_head grouplist; + struct list_head active_devices; + struct list_head inactive_devices; + struct dasd_unit_address_configuration *uac; + struct summary_unit_check_work_data suc_data; + struct read_uac_work_data ruac_data; + struct dasd_ccw_req *rsu_cqr; + struct completion lcu_setup; +}; + +struct alias_pav_group { + struct list_head group; + struct dasd_uid uid; + struct alias_lcu *lcu; + struct list_head baselist; + struct list_head aliaslist; + struct dasd_device *next; +}; + +struct dasd_conf_data { + struct dasd_ned neds[5]; + u8 reserved[64]; + struct dasd_gneq gneq; +} __packed; + +struct dasd_eckd_private { + struct dasd_eckd_characteristics rdc_data; + u8 *conf_data; + int conf_len; + + /* pointers to specific parts in the conf_data */ + struct dasd_ned *ned; + struct dasd_sneq *sneq; + struct vd_sneq *vdsneq; + struct dasd_gneq *gneq; + + struct eckd_count count_area[5]; + int init_cqr_status; + int uses_cdl; + struct attrib_data_t attrib; /* e.g. cache operations */ + struct dasd_rssd_features features; + u32 real_cyl; + + /* alias managemnet */ + struct dasd_uid uid; + struct alias_pav_group *pavgroup; + struct alias_lcu *lcu; + int count; + + u32 fcx_max_data; + char suc_reason; +}; + + + +int dasd_alias_make_device_known_to_lcu(struct dasd_device *); +void dasd_alias_disconnect_device_from_lcu(struct dasd_device *); +int dasd_alias_add_device(struct dasd_device *); +int dasd_alias_remove_device(struct dasd_device *); +struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *); +void dasd_alias_handle_summary_unit_check(struct work_struct *); +void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *); +void dasd_alias_lcu_setup_complete(struct dasd_device *); +void dasd_alias_wait_for_lcu_setup(struct dasd_device *); +int dasd_alias_update_add_device(struct dasd_device *); +#endif /* DASD_ECKD_H */ diff --git a/drivers/s390/block/dasd_eer.c b/drivers/s390/block/dasd_eer.c new file mode 100644 index 000000000..93bb09da7 --- /dev/null +++ b/drivers/s390/block/dasd_eer.c @@ -0,0 +1,723 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Character device driver for extended error reporting. + * + * Copyright IBM Corp. 2005 + * extended error reporting for DASD ECKD devices + * Author(s): Stefan Weinhuber + */ + +#define KMSG_COMPONENT "dasd-eckd" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "dasd_int.h" +#include "dasd_eckd.h" + +#ifdef PRINTK_HEADER +#undef PRINTK_HEADER +#endif /* PRINTK_HEADER */ +#define PRINTK_HEADER "dasd(eer):" + +/* + * SECTION: the internal buffer + */ + +/* + * The internal buffer is meant to store obaque blobs of data, so it does + * not know of higher level concepts like triggers. + * It consists of a number of pages that are used as a ringbuffer. Each data + * blob is stored in a simple record that consists of an integer, which + * contains the size of the following data, and the data bytes themselfes. + * + * To allow for multiple independent readers we create one internal buffer + * each time the device is opened and destroy the buffer when the file is + * closed again. The number of pages used for this buffer is determined by + * the module parmeter eer_pages. + * + * One record can be written to a buffer by using the functions + * - dasd_eer_start_record (one time per record to write the size to the + * buffer and reserve the space for the data) + * - dasd_eer_write_buffer (one or more times per record to write the data) + * The data can be written in several steps but you will have to compute + * the total size up front for the invocation of dasd_eer_start_record. + * If the ringbuffer is full, dasd_eer_start_record will remove the required + * number of old records. + * + * A record is typically read in two steps, first read the integer that + * specifies the size of the following data, then read the data. + * Both can be done by + * - dasd_eer_read_buffer + * + * For all mentioned functions you need to get the bufferlock first and keep + * it until a complete record is written or read. + * + * All information necessary to keep track of an internal buffer is kept in + * a struct eerbuffer. The buffer specific to a file pointer is strored in + * the private_data field of that file. To be able to write data to all + * existing buffers, each buffer is also added to the bufferlist. + * If the user does not want to read a complete record in one go, we have to + * keep track of the rest of the record. residual stores the number of bytes + * that are still to deliver. If the rest of the record is invalidated between + * two reads then residual will be set to -1 so that the next read will fail. + * All entries in the eerbuffer structure are protected with the bufferlock. + * To avoid races between writing to a buffer on the one side and creating + * and destroying buffers on the other side, the bufferlock must also be used + * to protect the bufferlist. + */ + +static int eer_pages = 5; +module_param(eer_pages, int, S_IRUGO|S_IWUSR); + +struct eerbuffer { + struct list_head list; + char **buffer; + int buffersize; + int buffer_page_count; + int head; + int tail; + int residual; +}; + +static LIST_HEAD(bufferlist); +static DEFINE_SPINLOCK(bufferlock); +static DECLARE_WAIT_QUEUE_HEAD(dasd_eer_read_wait_queue); + +/* + * How many free bytes are available on the buffer. + * Needs to be called with bufferlock held. + */ +static int dasd_eer_get_free_bytes(struct eerbuffer *eerb) +{ + if (eerb->head < eerb->tail) + return eerb->tail - eerb->head - 1; + return eerb->buffersize - eerb->head + eerb->tail -1; +} + +/* + * How many bytes of buffer space are used. + * Needs to be called with bufferlock held. + */ +static int dasd_eer_get_filled_bytes(struct eerbuffer *eerb) +{ + + if (eerb->head >= eerb->tail) + return eerb->head - eerb->tail; + return eerb->buffersize - eerb->tail + eerb->head; +} + +/* + * The dasd_eer_write_buffer function just copies count bytes of data + * to the buffer. Make sure to call dasd_eer_start_record first, to + * make sure that enough free space is available. + * Needs to be called with bufferlock held. + */ +static void dasd_eer_write_buffer(struct eerbuffer *eerb, + char *data, int count) +{ + + unsigned long headindex,localhead; + unsigned long rest, len; + char *nextdata; + + nextdata = data; + rest = count; + while (rest > 0) { + headindex = eerb->head / PAGE_SIZE; + localhead = eerb->head % PAGE_SIZE; + len = min(rest, PAGE_SIZE - localhead); + memcpy(eerb->buffer[headindex]+localhead, nextdata, len); + nextdata += len; + rest -= len; + eerb->head += len; + if (eerb->head == eerb->buffersize) + eerb->head = 0; /* wrap around */ + BUG_ON(eerb->head > eerb->buffersize); + } +} + +/* + * Needs to be called with bufferlock held. + */ +static int dasd_eer_read_buffer(struct eerbuffer *eerb, char *data, int count) +{ + + unsigned long tailindex,localtail; + unsigned long rest, len, finalcount; + char *nextdata; + + finalcount = min(count, dasd_eer_get_filled_bytes(eerb)); + nextdata = data; + rest = finalcount; + while (rest > 0) { + tailindex = eerb->tail / PAGE_SIZE; + localtail = eerb->tail % PAGE_SIZE; + len = min(rest, PAGE_SIZE - localtail); + memcpy(nextdata, eerb->buffer[tailindex] + localtail, len); + nextdata += len; + rest -= len; + eerb->tail += len; + if (eerb->tail == eerb->buffersize) + eerb->tail = 0; /* wrap around */ + BUG_ON(eerb->tail > eerb->buffersize); + } + return finalcount; +} + +/* + * Whenever you want to write a blob of data to the internal buffer you + * have to start by using this function first. It will write the number + * of bytes that will be written to the buffer. If necessary it will remove + * old records to make room for the new one. + * Needs to be called with bufferlock held. + */ +static int dasd_eer_start_record(struct eerbuffer *eerb, int count) +{ + int tailcount; + + if (count + sizeof(count) > eerb->buffersize) + return -ENOMEM; + while (dasd_eer_get_free_bytes(eerb) < count + sizeof(count)) { + if (eerb->residual > 0) { + eerb->tail += eerb->residual; + if (eerb->tail >= eerb->buffersize) + eerb->tail -= eerb->buffersize; + eerb->residual = -1; + } + dasd_eer_read_buffer(eerb, (char *) &tailcount, + sizeof(tailcount)); + eerb->tail += tailcount; + if (eerb->tail >= eerb->buffersize) + eerb->tail -= eerb->buffersize; + } + dasd_eer_write_buffer(eerb, (char*) &count, sizeof(count)); + + return 0; +}; + +/* + * Release pages that are not used anymore. + */ +static void dasd_eer_free_buffer_pages(char **buf, int no_pages) +{ + int i; + + for (i = 0; i < no_pages; i++) + free_page((unsigned long) buf[i]); +} + +/* + * Allocate a new set of memory pages. + */ +static int dasd_eer_allocate_buffer_pages(char **buf, int no_pages) +{ + int i; + + for (i = 0; i < no_pages; i++) { + buf[i] = (char *) get_zeroed_page(GFP_KERNEL); + if (!buf[i]) { + dasd_eer_free_buffer_pages(buf, i); + return -ENOMEM; + } + } + return 0; +} + +/* + * SECTION: The extended error reporting functionality + */ + +/* + * When a DASD device driver wants to report an error, it calls the + * function dasd_eer_write and gives the respective trigger ID as + * parameter. Currently there are four kinds of triggers: + * + * DASD_EER_FATALERROR: all kinds of unrecoverable I/O problems + * DASD_EER_PPRCSUSPEND: PPRC was suspended + * DASD_EER_NOPATH: There is no path to the device left. + * DASD_EER_STATECHANGE: The state of the device has changed. + * + * For the first three triggers all required information can be supplied by + * the caller. For these triggers a record is written by the function + * dasd_eer_write_standard_trigger. + * + * The DASD_EER_STATECHANGE trigger is special since a sense subsystem + * status ccw need to be executed to gather the necessary sense data first. + * The dasd_eer_snss function will queue the SNSS request and the request + * callback will then call dasd_eer_write with the DASD_EER_STATCHANGE + * trigger. + * + * To avoid memory allocations at runtime, the necessary memory is allocated + * when the extended error reporting is enabled for a device (by + * dasd_eer_probe). There is one sense subsystem status request for each + * eer enabled DASD device. The presence of the cqr in device->eer_cqr + * indicates that eer is enable for the device. The use of the snss request + * is protected by the DASD_FLAG_EER_IN_USE bit. When this flag indicates + * that the cqr is currently in use, dasd_eer_snss cannot start a second + * request but sets the DASD_FLAG_EER_SNSS flag instead. The callback of + * the SNSS request will check the bit and call dasd_eer_snss again. + */ + +#define SNSS_DATA_SIZE 44 + +#define DASD_EER_BUSID_SIZE 10 +struct dasd_eer_header { + __u32 total_size; + __u32 trigger; + __u64 tv_sec; + __u64 tv_usec; + char busid[DASD_EER_BUSID_SIZE]; +} __attribute__ ((packed)); + +/* + * The following function can be used for those triggers that have + * all necessary data available when the function is called. + * If the parameter cqr is not NULL, the chain of requests will be searched + * for valid sense data, and all valid sense data sets will be added to + * the triggers data. + */ +static void dasd_eer_write_standard_trigger(struct dasd_device *device, + struct dasd_ccw_req *cqr, + int trigger) +{ + struct dasd_ccw_req *temp_cqr; + int data_size; + struct timespec64 ts; + struct dasd_eer_header header; + unsigned long flags; + struct eerbuffer *eerb; + char *sense; + + /* go through cqr chain and count the valid sense data sets */ + data_size = 0; + for (temp_cqr = cqr; temp_cqr; temp_cqr = temp_cqr->refers) + if (dasd_get_sense(&temp_cqr->irb)) + data_size += 32; + + header.total_size = sizeof(header) + data_size + 4; /* "EOR" */ + header.trigger = trigger; + ktime_get_real_ts64(&ts); + header.tv_sec = ts.tv_sec; + header.tv_usec = ts.tv_nsec / NSEC_PER_USEC; + strlcpy(header.busid, dev_name(&device->cdev->dev), + DASD_EER_BUSID_SIZE); + + spin_lock_irqsave(&bufferlock, flags); + list_for_each_entry(eerb, &bufferlist, list) { + dasd_eer_start_record(eerb, header.total_size); + dasd_eer_write_buffer(eerb, (char *) &header, sizeof(header)); + for (temp_cqr = cqr; temp_cqr; temp_cqr = temp_cqr->refers) { + sense = dasd_get_sense(&temp_cqr->irb); + if (sense) + dasd_eer_write_buffer(eerb, sense, 32); + } + dasd_eer_write_buffer(eerb, "EOR", 4); + } + spin_unlock_irqrestore(&bufferlock, flags); + wake_up_interruptible(&dasd_eer_read_wait_queue); +} + +/* + * This function writes a DASD_EER_STATECHANGE trigger. + */ +static void dasd_eer_write_snss_trigger(struct dasd_device *device, + struct dasd_ccw_req *cqr, + int trigger) +{ + int data_size; + int snss_rc; + struct timespec64 ts; + struct dasd_eer_header header; + unsigned long flags; + struct eerbuffer *eerb; + + snss_rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; + if (snss_rc) + data_size = 0; + else + data_size = SNSS_DATA_SIZE; + + header.total_size = sizeof(header) + data_size + 4; /* "EOR" */ + header.trigger = DASD_EER_STATECHANGE; + ktime_get_real_ts64(&ts); + header.tv_sec = ts.tv_sec; + header.tv_usec = ts.tv_nsec / NSEC_PER_USEC; + strlcpy(header.busid, dev_name(&device->cdev->dev), + DASD_EER_BUSID_SIZE); + + spin_lock_irqsave(&bufferlock, flags); + list_for_each_entry(eerb, &bufferlist, list) { + dasd_eer_start_record(eerb, header.total_size); + dasd_eer_write_buffer(eerb, (char *) &header , sizeof(header)); + if (!snss_rc) + dasd_eer_write_buffer(eerb, cqr->data, SNSS_DATA_SIZE); + dasd_eer_write_buffer(eerb, "EOR", 4); + } + spin_unlock_irqrestore(&bufferlock, flags); + wake_up_interruptible(&dasd_eer_read_wait_queue); +} + +/* + * This function is called for all triggers. It calls the appropriate + * function that writes the actual trigger records. + */ +void dasd_eer_write(struct dasd_device *device, struct dasd_ccw_req *cqr, + unsigned int id) +{ + if (!device->eer_cqr) + return; + switch (id) { + case DASD_EER_FATALERROR: + case DASD_EER_PPRCSUSPEND: + dasd_eer_write_standard_trigger(device, cqr, id); + break; + case DASD_EER_NOPATH: + dasd_eer_write_standard_trigger(device, NULL, id); + break; + case DASD_EER_STATECHANGE: + dasd_eer_write_snss_trigger(device, cqr, id); + break; + default: /* unknown trigger, so we write it without any sense data */ + dasd_eer_write_standard_trigger(device, NULL, id); + break; + } +} +EXPORT_SYMBOL(dasd_eer_write); + +/* + * Start a sense subsystem status request. + * Needs to be called with the device held. + */ +void dasd_eer_snss(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr; + + cqr = device->eer_cqr; + if (!cqr) /* Device not eer enabled. */ + return; + if (test_and_set_bit(DASD_FLAG_EER_IN_USE, &device->flags)) { + /* Sense subsystem status request in use. */ + set_bit(DASD_FLAG_EER_SNSS, &device->flags); + return; + } + /* cdev is already locked, can't use dasd_add_request_head */ + clear_bit(DASD_FLAG_EER_SNSS, &device->flags); + cqr->status = DASD_CQR_QUEUED; + list_add(&cqr->devlist, &device->ccw_queue); + dasd_schedule_device_bh(device); +} + +/* + * Callback function for use with sense subsystem status request. + */ +static void dasd_eer_snss_cb(struct dasd_ccw_req *cqr, void *data) +{ + struct dasd_device *device = cqr->startdev; + unsigned long flags; + + dasd_eer_write(device, cqr, DASD_EER_STATECHANGE); + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + if (device->eer_cqr == cqr) { + clear_bit(DASD_FLAG_EER_IN_USE, &device->flags); + if (test_bit(DASD_FLAG_EER_SNSS, &device->flags)) + /* Another SNSS has been requested in the meantime. */ + dasd_eer_snss(device); + cqr = NULL; + } + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + if (cqr) + /* + * Extended error recovery has been switched off while + * the SNSS request was running. It could even have + * been switched off and on again in which case there + * is a new ccw in device->eer_cqr. Free the "old" + * snss request now. + */ + dasd_sfree_request(cqr, device); +} + +/* + * Enable error reporting on a given device. + */ +int dasd_eer_enable(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr = NULL; + unsigned long flags; + struct ccw1 *ccw; + int rc = 0; + + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + if (device->eer_cqr) + goto out; + else if (!device->discipline || + strcmp(device->discipline->name, "ECKD")) + rc = -EMEDIUMTYPE; + else if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) + rc = -EBUSY; + + if (rc) + goto out; + + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* SNSS */, + SNSS_DATA_SIZE, device, NULL); + if (IS_ERR(cqr)) { + rc = -ENOMEM; + cqr = NULL; + goto out; + } + + cqr->startdev = device; + cqr->retries = 255; + cqr->expires = 10 * HZ; + clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags); + + ccw = cqr->cpaddr; + ccw->cmd_code = DASD_ECKD_CCW_SNSS; + ccw->count = SNSS_DATA_SIZE; + ccw->flags = 0; + ccw->cda = (__u32)(addr_t) cqr->data; + + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + cqr->callback = dasd_eer_snss_cb; + + if (!device->eer_cqr) { + device->eer_cqr = cqr; + cqr = NULL; + } + +out: + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + + if (cqr) + dasd_sfree_request(cqr, device); + + return rc; +} + +/* + * Disable error reporting on a given device. + */ +void dasd_eer_disable(struct dasd_device *device) +{ + struct dasd_ccw_req *cqr; + unsigned long flags; + int in_use; + + if (!device->eer_cqr) + return; + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + cqr = device->eer_cqr; + device->eer_cqr = NULL; + clear_bit(DASD_FLAG_EER_SNSS, &device->flags); + in_use = test_and_clear_bit(DASD_FLAG_EER_IN_USE, &device->flags); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + if (cqr && !in_use) + dasd_sfree_request(cqr, device); +} + +/* + * SECTION: the device operations + */ + +/* + * On the one side we need a lock to access our internal buffer, on the + * other side a copy_to_user can sleep. So we need to copy the data we have + * to transfer in a readbuffer, which is protected by the readbuffer_mutex. + */ +static char readbuffer[PAGE_SIZE]; +static DEFINE_MUTEX(readbuffer_mutex); + +static int dasd_eer_open(struct inode *inp, struct file *filp) +{ + struct eerbuffer *eerb; + unsigned long flags; + + eerb = kzalloc(sizeof(struct eerbuffer), GFP_KERNEL); + if (!eerb) + return -ENOMEM; + eerb->buffer_page_count = eer_pages; + if (eerb->buffer_page_count < 1 || + eerb->buffer_page_count > INT_MAX / PAGE_SIZE) { + kfree(eerb); + DBF_EVENT(DBF_WARNING, "can't open device since module " + "parameter eer_pages is smaller than 1 or" + " bigger than %d", (int)(INT_MAX / PAGE_SIZE)); + return -EINVAL; + } + eerb->buffersize = eerb->buffer_page_count * PAGE_SIZE; + eerb->buffer = kmalloc_array(eerb->buffer_page_count, sizeof(char *), + GFP_KERNEL); + if (!eerb->buffer) { + kfree(eerb); + return -ENOMEM; + } + if (dasd_eer_allocate_buffer_pages(eerb->buffer, + eerb->buffer_page_count)) { + kfree(eerb->buffer); + kfree(eerb); + return -ENOMEM; + } + filp->private_data = eerb; + spin_lock_irqsave(&bufferlock, flags); + list_add(&eerb->list, &bufferlist); + spin_unlock_irqrestore(&bufferlock, flags); + + return nonseekable_open(inp,filp); +} + +static int dasd_eer_close(struct inode *inp, struct file *filp) +{ + struct eerbuffer *eerb; + unsigned long flags; + + eerb = (struct eerbuffer *) filp->private_data; + spin_lock_irqsave(&bufferlock, flags); + list_del(&eerb->list); + spin_unlock_irqrestore(&bufferlock, flags); + dasd_eer_free_buffer_pages(eerb->buffer, eerb->buffer_page_count); + kfree(eerb->buffer); + kfree(eerb); + + return 0; +} + +static ssize_t dasd_eer_read(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + int tc,rc; + int tailcount,effective_count; + unsigned long flags; + struct eerbuffer *eerb; + + eerb = (struct eerbuffer *) filp->private_data; + if (mutex_lock_interruptible(&readbuffer_mutex)) + return -ERESTARTSYS; + + spin_lock_irqsave(&bufferlock, flags); + + if (eerb->residual < 0) { /* the remainder of this record */ + /* has been deleted */ + eerb->residual = 0; + spin_unlock_irqrestore(&bufferlock, flags); + mutex_unlock(&readbuffer_mutex); + return -EIO; + } else if (eerb->residual > 0) { + /* OK we still have a second half of a record to deliver */ + effective_count = min(eerb->residual, (int) count); + eerb->residual -= effective_count; + } else { + tc = 0; + while (!tc) { + tc = dasd_eer_read_buffer(eerb, (char *) &tailcount, + sizeof(tailcount)); + if (!tc) { + /* no data available */ + spin_unlock_irqrestore(&bufferlock, flags); + mutex_unlock(&readbuffer_mutex); + if (filp->f_flags & O_NONBLOCK) + return -EAGAIN; + rc = wait_event_interruptible( + dasd_eer_read_wait_queue, + eerb->head != eerb->tail); + if (rc) + return rc; + if (mutex_lock_interruptible(&readbuffer_mutex)) + return -ERESTARTSYS; + spin_lock_irqsave(&bufferlock, flags); + } + } + WARN_ON(tc != sizeof(tailcount)); + effective_count = min(tailcount,(int)count); + eerb->residual = tailcount - effective_count; + } + + tc = dasd_eer_read_buffer(eerb, readbuffer, effective_count); + WARN_ON(tc != effective_count); + + spin_unlock_irqrestore(&bufferlock, flags); + + if (copy_to_user(buf, readbuffer, effective_count)) { + mutex_unlock(&readbuffer_mutex); + return -EFAULT; + } + + mutex_unlock(&readbuffer_mutex); + return effective_count; +} + +static __poll_t dasd_eer_poll(struct file *filp, poll_table *ptable) +{ + __poll_t mask; + unsigned long flags; + struct eerbuffer *eerb; + + eerb = (struct eerbuffer *) filp->private_data; + poll_wait(filp, &dasd_eer_read_wait_queue, ptable); + spin_lock_irqsave(&bufferlock, flags); + if (eerb->head != eerb->tail) + mask = EPOLLIN | EPOLLRDNORM ; + else + mask = 0; + spin_unlock_irqrestore(&bufferlock, flags); + return mask; +} + +static const struct file_operations dasd_eer_fops = { + .open = &dasd_eer_open, + .release = &dasd_eer_close, + .read = &dasd_eer_read, + .poll = &dasd_eer_poll, + .owner = THIS_MODULE, + .llseek = noop_llseek, +}; + +static struct miscdevice *dasd_eer_dev = NULL; + +int __init dasd_eer_init(void) +{ + int rc; + + dasd_eer_dev = kzalloc(sizeof(*dasd_eer_dev), GFP_KERNEL); + if (!dasd_eer_dev) + return -ENOMEM; + + dasd_eer_dev->minor = MISC_DYNAMIC_MINOR; + dasd_eer_dev->name = "dasd_eer"; + dasd_eer_dev->fops = &dasd_eer_fops; + + rc = misc_register(dasd_eer_dev); + if (rc) { + kfree(dasd_eer_dev); + dasd_eer_dev = NULL; + DBF_EVENT(DBF_ERR, "%s", "dasd_eer_init could not " + "register misc device"); + return rc; + } + + return 0; +} + +void dasd_eer_exit(void) +{ + if (dasd_eer_dev) { + misc_deregister(dasd_eer_dev); + kfree(dasd_eer_dev); + dasd_eer_dev = NULL; + } +} diff --git a/drivers/s390/block/dasd_erp.c b/drivers/s390/block/dasd_erp.c new file mode 100644 index 000000000..ba4fa372d --- /dev/null +++ b/drivers/s390/block/dasd_erp.c @@ -0,0 +1,203 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Holger Smolinski + * Horst Hummel + * Carsten Otte + * Martin Schwidefsky + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2001 + * + */ + +#define KMSG_COMPONENT "dasd" + +#include +#include + +#include +#include +#include + +/* This is ugly... */ +#define PRINTK_HEADER "dasd_erp:" + +#include "dasd_int.h" + +struct dasd_ccw_req * +dasd_alloc_erp_request(char *magic, int cplength, int datasize, + struct dasd_device * device) +{ + unsigned long flags; + struct dasd_ccw_req *cqr; + char *data; + int size; + + /* Sanity checks */ + BUG_ON( magic == NULL || datasize > PAGE_SIZE || + (cplength*sizeof(struct ccw1)) > PAGE_SIZE); + + size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; + if (cplength > 0) + size += cplength * sizeof(struct ccw1); + if (datasize > 0) + size += datasize; + spin_lock_irqsave(&device->mem_lock, flags); + cqr = (struct dasd_ccw_req *) + dasd_alloc_chunk(&device->erp_chunks, size); + spin_unlock_irqrestore(&device->mem_lock, flags); + if (cqr == NULL) + return ERR_PTR(-ENOMEM); + memset(cqr, 0, sizeof(struct dasd_ccw_req)); + INIT_LIST_HEAD(&cqr->devlist); + INIT_LIST_HEAD(&cqr->blocklist); + data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); + cqr->cpaddr = NULL; + if (cplength > 0) { + cqr->cpaddr = (struct ccw1 *) data; + data += cplength*sizeof(struct ccw1); + memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); + } + cqr->data = NULL; + if (datasize > 0) { + cqr->data = data; + memset(cqr->data, 0, datasize); + } + strncpy((char *) &cqr->magic, magic, 4); + ASCEBC((char *) &cqr->magic, 4); + set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); + dasd_get_device(device); + return cqr; +} + +void +dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device) +{ + unsigned long flags; + + spin_lock_irqsave(&device->mem_lock, flags); + dasd_free_chunk(&device->erp_chunks, cqr); + spin_unlock_irqrestore(&device->mem_lock, flags); + atomic_dec(&device->ref_count); +} + + +/* + * dasd_default_erp_action just retries the current cqr + */ +struct dasd_ccw_req * +dasd_default_erp_action(struct dasd_ccw_req *cqr) +{ + struct dasd_device *device; + + device = cqr->startdev; + + /* just retry - there is nothing to save ... I got no sense data.... */ + if (cqr->retries > 0) { + DBF_DEV_EVENT(DBF_DEBUG, device, + "default ERP called (%i retries left)", + cqr->retries); + if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) + cqr->lpm = dasd_path_get_opm(device); + cqr->status = DASD_CQR_FILLED; + } else { + pr_err("%s: default ERP has run out of retries and failed\n", + dev_name(&device->cdev->dev)); + cqr->status = DASD_CQR_FAILED; + cqr->stopclk = get_tod_clock(); + } + return cqr; +} /* end dasd_default_erp_action */ + +/* + * DESCRIPTION + * Frees all ERPs of the current ERP Chain and set the status + * of the original CQR either to DASD_CQR_DONE if ERP was successful + * or to DASD_CQR_FAILED if ERP was NOT successful. + * NOTE: This function is only called if no discipline postaction + * is available + * + * PARAMETER + * erp current erp_head + * + * RETURN VALUES + * cqr pointer to the original CQR + */ +struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr) +{ + int success; + unsigned long startclk, stopclk; + struct dasd_device *startdev; + + BUG_ON(cqr->refers == NULL || cqr->function == NULL); + + success = cqr->status == DASD_CQR_DONE; + startclk = cqr->startclk; + stopclk = cqr->stopclk; + startdev = cqr->startdev; + + /* free all ERPs - but NOT the original cqr */ + while (cqr->refers != NULL) { + struct dasd_ccw_req *refers; + + refers = cqr->refers; + /* remove the request from the block queue */ + list_del(&cqr->blocklist); + /* free the finished erp request */ + dasd_free_erp_request(cqr, cqr->memdev); + cqr = refers; + } + + /* set corresponding status to original cqr */ + cqr->startclk = startclk; + cqr->stopclk = stopclk; + cqr->startdev = startdev; + if (success) + cqr->status = DASD_CQR_DONE; + else { + cqr->status = DASD_CQR_FAILED; + cqr->stopclk = get_tod_clock(); + } + + return cqr; + +} /* end default_erp_postaction */ + +void +dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb) +{ + struct dasd_device *device; + + device = cqr->startdev; + if (cqr->intrc == -ETIMEDOUT) { + dev_err(&device->cdev->dev, + "A timeout error occurred for cqr %p\n", cqr); + return; + } + if (cqr->intrc == -ENOLINK) { + dev_err(&device->cdev->dev, + "A transport error occurred for cqr %p\n", cqr); + return; + } + /* dump sense data */ + if (device->discipline && device->discipline->dump_sense) + device->discipline->dump_sense(device, cqr, irb); +} + +void +dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb) +{ + struct dasd_device *device; + + device = cqr->startdev; + /* dump sense data to s390 debugfeature*/ + if (device->discipline && device->discipline->dump_sense_dbf) + device->discipline->dump_sense_dbf(device, irb, "log"); +} +EXPORT_SYMBOL(dasd_log_sense_dbf); + +EXPORT_SYMBOL(dasd_default_erp_action); +EXPORT_SYMBOL(dasd_default_erp_postaction); +EXPORT_SYMBOL(dasd_alloc_erp_request); +EXPORT_SYMBOL(dasd_free_erp_request); +EXPORT_SYMBOL(dasd_log_sense); + diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c new file mode 100644 index 000000000..fab09455b --- /dev/null +++ b/drivers/s390/block/dasd_fba.c @@ -0,0 +1,835 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Holger Smolinski + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2009 + */ + +#define KMSG_COMPONENT "dasd-fba" + +#include +#include +#include + +#include +#include /* HDIO_GETGEO */ +#include +#include +#include + +#include +#include +#include +#include + +#include "dasd_int.h" +#include "dasd_fba.h" + +#ifdef PRINTK_HEADER +#undef PRINTK_HEADER +#endif /* PRINTK_HEADER */ +#define PRINTK_HEADER "dasd(fba):" + +#define FBA_DEFAULT_RETRIES 32 + +#define DASD_FBA_CCW_WRITE 0x41 +#define DASD_FBA_CCW_READ 0x42 +#define DASD_FBA_CCW_LOCATE 0x43 +#define DASD_FBA_CCW_DEFINE_EXTENT 0x63 + +MODULE_LICENSE("GPL"); + +static struct dasd_discipline dasd_fba_discipline; +static void *dasd_fba_zero_page; + +struct dasd_fba_private { + struct dasd_fba_characteristics rdc_data; +}; + +static struct ccw_device_id dasd_fba_ids[] = { + { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1}, + { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2}, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ccw, dasd_fba_ids); + +static struct ccw_driver dasd_fba_driver; /* see below */ +static int +dasd_fba_probe(struct ccw_device *cdev) +{ + return dasd_generic_probe(cdev, &dasd_fba_discipline); +} + +static int +dasd_fba_set_online(struct ccw_device *cdev) +{ + return dasd_generic_set_online(cdev, &dasd_fba_discipline); +} + +static struct ccw_driver dasd_fba_driver = { + .driver = { + .name = "dasd-fba", + .owner = THIS_MODULE, + }, + .ids = dasd_fba_ids, + .probe = dasd_fba_probe, + .remove = dasd_generic_remove, + .set_offline = dasd_generic_set_offline, + .set_online = dasd_fba_set_online, + .notify = dasd_generic_notify, + .path_event = dasd_generic_path_event, + .freeze = dasd_generic_pm_freeze, + .thaw = dasd_generic_restore_device, + .restore = dasd_generic_restore_device, + .int_class = IRQIO_DAS, +}; + +static void +define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw, + int blksize, int beg, int nr) +{ + ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT; + ccw->flags = 0; + ccw->count = 16; + ccw->cda = (__u32) __pa(data); + memset(data, 0, sizeof (struct DE_fba_data)); + if (rw == WRITE) + (data->mask).perm = 0x0; + else if (rw == READ) + (data->mask).perm = 0x1; + else + data->mask.perm = 0x2; + data->blk_size = blksize; + data->ext_loc = beg; + data->ext_end = nr - 1; +} + +static void +locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw, + int block_nr, int block_ct) +{ + ccw->cmd_code = DASD_FBA_CCW_LOCATE; + ccw->flags = 0; + ccw->count = 8; + ccw->cda = (__u32) __pa(data); + memset(data, 0, sizeof (struct LO_fba_data)); + if (rw == WRITE) + data->operation.cmd = 0x5; + else if (rw == READ) + data->operation.cmd = 0x6; + else + data->operation.cmd = 0x8; + data->blk_nr = block_nr; + data->blk_ct = block_ct; +} + +static int +dasd_fba_check_characteristics(struct dasd_device *device) +{ + struct dasd_fba_private *private = device->private; + struct ccw_device *cdev = device->cdev; + struct dasd_block *block; + int readonly, rc; + + if (!private) { + private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); + if (!private) { + dev_warn(&device->cdev->dev, + "Allocating memory for private DASD " + "data failed\n"); + return -ENOMEM; + } + device->private = private; + } else { + memset(private, 0, sizeof(*private)); + } + block = dasd_alloc_block(); + if (IS_ERR(block)) { + DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate " + "dasd block structure"); + device->private = NULL; + kfree(private); + return PTR_ERR(block); + } + device->block = block; + block->base = device; + + /* Read Device Characteristics */ + rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC, + &private->rdc_data, 32); + if (rc) { + DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device " + "characteristics returned error %d", rc); + device->block = NULL; + dasd_free_block(block); + device->private = NULL; + kfree(private); + return rc; + } + + device->default_expires = DASD_EXPIRES; + device->default_retries = FBA_DEFAULT_RETRIES; + dasd_path_set_opm(device, LPM_ANYPATH); + + readonly = dasd_device_is_ro(device); + if (readonly) + set_bit(DASD_FLAG_DEVICE_RO, &device->flags); + + /* FBA supports discard, set the according feature bit */ + dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1); + + dev_info(&device->cdev->dev, + "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB " + "and %d B/blk%s\n", + cdev->id.dev_type, + cdev->id.dev_model, + cdev->id.cu_type, + cdev->id.cu_model, + ((private->rdc_data.blk_bdsa * + (private->rdc_data.blk_size >> 9)) >> 11), + private->rdc_data.blk_size, + readonly ? ", read-only device" : ""); + return 0; +} + +static int dasd_fba_do_analysis(struct dasd_block *block) +{ + struct dasd_fba_private *private = block->base->private; + int sb, rc; + + rc = dasd_check_blocksize(private->rdc_data.blk_size); + if (rc) { + DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d", + private->rdc_data.blk_size); + return rc; + } + block->blocks = private->rdc_data.blk_bdsa; + block->bp_block = private->rdc_data.blk_size; + block->s2b_shift = 0; /* bits to shift 512 to get a block */ + for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1) + block->s2b_shift++; + return 0; +} + +static int dasd_fba_fill_geometry(struct dasd_block *block, + struct hd_geometry *geo) +{ + if (dasd_check_blocksize(block->bp_block) != 0) + return -EINVAL; + geo->cylinders = (block->blocks << block->s2b_shift) >> 10; + geo->heads = 16; + geo->sectors = 128 >> block->s2b_shift; + return 0; +} + +static dasd_erp_fn_t +dasd_fba_erp_action(struct dasd_ccw_req * cqr) +{ + return dasd_default_erp_action; +} + +static dasd_erp_fn_t +dasd_fba_erp_postaction(struct dasd_ccw_req * cqr) +{ + if (cqr->function == dasd_default_erp_action) + return dasd_default_erp_postaction; + + DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p", + cqr->function); + return NULL; +} + +static void dasd_fba_check_for_device_change(struct dasd_device *device, + struct dasd_ccw_req *cqr, + struct irb *irb) +{ + char mask; + + /* first of all check for state change pending interrupt */ + mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; + if ((irb->scsw.cmd.dstat & mask) == mask) + dasd_generic_handle_state_change(device); +}; + + +/* + * Builds a CCW with no data payload + */ +static void ccw_write_no_data(struct ccw1 *ccw) +{ + ccw->cmd_code = DASD_FBA_CCW_WRITE; + ccw->flags |= CCW_FLAG_SLI; + ccw->count = 0; +} + +/* + * Builds a CCW that writes only zeroes. + */ +static void ccw_write_zero(struct ccw1 *ccw, int count) +{ + ccw->cmd_code = DASD_FBA_CCW_WRITE; + ccw->flags |= CCW_FLAG_SLI; + ccw->count = count; + ccw->cda = (__u32) (addr_t) dasd_fba_zero_page; +} + +/* + * Helper function to count the amount of necessary CCWs within a given range + * with 4k alignment and command chaining in mind. + */ +static int count_ccws(sector_t first_rec, sector_t last_rec, + unsigned int blocks_per_page) +{ + sector_t wz_stop = 0, d_stop = 0; + int cur_pos = 0; + int count = 0; + + if (first_rec % blocks_per_page != 0) { + wz_stop = first_rec + blocks_per_page - + (first_rec % blocks_per_page) - 1; + if (wz_stop > last_rec) + wz_stop = last_rec; + cur_pos = wz_stop - first_rec + 1; + count++; + } + + if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) { + if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0) + d_stop = last_rec - ((last_rec - blocks_per_page + 1) % + blocks_per_page); + else + d_stop = last_rec; + + cur_pos += d_stop - (first_rec + cur_pos) + 1; + count++; + } + + if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) + count++; + + return count; +} + +/* + * This function builds a CCW request for block layer discard requests. + * Each page in the z/VM hypervisor that represents certain records of an FBA + * device will be padded with zeros. This is a special behaviour of the WRITE + * command which is triggered when no data payload is added to the CCW. + * + * Note: Due to issues in some z/VM versions, we can't fully utilise this + * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to + * work around those issues and write actual zeroes to the unaligned parts in + * the request. This workaround might be removed in the future. + */ +static struct dasd_ccw_req *dasd_fba_build_cp_discard( + struct dasd_device *memdev, + struct dasd_block *block, + struct request *req) +{ + struct LO_fba_data *LO_data; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + + sector_t wz_stop = 0, d_stop = 0; + sector_t first_rec, last_rec; + + unsigned int blksize = block->bp_block; + unsigned int blocks_per_page; + int wz_count = 0; + int d_count = 0; + int cur_pos = 0; /* Current position within the extent */ + int count = 0; + int cplength; + int datasize; + int nr_ccws; + + first_rec = blk_rq_pos(req) >> block->s2b_shift; + last_rec = + (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; + count = last_rec - first_rec + 1; + + blocks_per_page = BLOCKS_PER_PAGE(blksize); + nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page); + + /* define extent + nr_ccws * locate record + nr_ccws * single CCW */ + cplength = 1 + 2 * nr_ccws; + datasize = sizeof(struct DE_fba_data) + + nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1)); + + cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev, + blk_mq_rq_to_pdu(req)); + if (IS_ERR(cqr)) + return cqr; + + ccw = cqr->cpaddr; + + define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count); + LO_data = cqr->data + sizeof(struct DE_fba_data); + + /* First part is not aligned. Calculate range to write zeroes. */ + if (first_rec % blocks_per_page != 0) { + wz_stop = first_rec + blocks_per_page - + (first_rec % blocks_per_page) - 1; + if (wz_stop > last_rec) + wz_stop = last_rec; + wz_count = wz_stop - first_rec + 1; + + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count); + + ccw[-1].flags |= CCW_FLAG_CC; + ccw_write_zero(ccw++, wz_count * blksize); + + cur_pos = wz_count; + } + + /* We can do proper discard when we've got at least blocks_per_page blocks. */ + if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) { + /* is last record at page boundary? */ + if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0) + d_stop = last_rec - ((last_rec - blocks_per_page + 1) % + blocks_per_page); + else + d_stop = last_rec; + + d_count = d_stop - (first_rec + cur_pos) + 1; + + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count); + + ccw[-1].flags |= CCW_FLAG_CC; + ccw_write_no_data(ccw++); + + cur_pos += d_count; + } + + /* We might still have some bits left which need to be zeroed. */ + if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) { + if (d_stop != 0) + wz_count = last_rec - d_stop; + else if (wz_stop != 0) + wz_count = last_rec - wz_stop; + else + wz_count = count; + + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count); + + ccw[-1].flags |= CCW_FLAG_CC; + ccw_write_zero(ccw++, wz_count * blksize); + } + + if (blk_noretry_request(req) || + block->base->features & DASD_FEATURE_FAILFAST) + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + + cqr->startdev = memdev; + cqr->memdev = memdev; + cqr->block = block; + cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */ + cqr->retries = memdev->default_retries; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + + return cqr; +} + +static struct dasd_ccw_req *dasd_fba_build_cp_regular( + struct dasd_device *memdev, + struct dasd_block *block, + struct request *req) +{ + struct dasd_fba_private *private = block->base->private; + unsigned long *idaws; + struct LO_fba_data *LO_data; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + struct req_iterator iter; + struct bio_vec bv; + char *dst; + int count, cidaw, cplength, datasize; + sector_t recid, first_rec, last_rec; + unsigned int blksize, off; + unsigned char cmd; + + if (rq_data_dir(req) == READ) { + cmd = DASD_FBA_CCW_READ; + } else if (rq_data_dir(req) == WRITE) { + cmd = DASD_FBA_CCW_WRITE; + } else + return ERR_PTR(-EINVAL); + blksize = block->bp_block; + /* Calculate record id of first and last block. */ + first_rec = blk_rq_pos(req) >> block->s2b_shift; + last_rec = + (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; + /* Check struct bio and count the number of blocks for the request. */ + count = 0; + cidaw = 0; + rq_for_each_segment(bv, req, iter) { + if (bv.bv_len & (blksize - 1)) + /* Fba can only do full blocks. */ + return ERR_PTR(-EINVAL); + count += bv.bv_len >> (block->s2b_shift + 9); + if (idal_is_needed (page_address(bv.bv_page), bv.bv_len)) + cidaw += bv.bv_len / blksize; + } + /* Paranoia. */ + if (count != last_rec - first_rec + 1) + return ERR_PTR(-EINVAL); + /* 1x define extent + 1x locate record + number of blocks */ + cplength = 2 + count; + /* 1x define extent + 1x locate record */ + datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) + + cidaw * sizeof(unsigned long); + /* + * Find out number of additional locate record ccws if the device + * can't do data chaining. + */ + if (private->rdc_data.mode.bits.data_chain == 0) { + cplength += count - 1; + datasize += (count - 1)*sizeof(struct LO_fba_data); + } + /* Allocate the ccw request. */ + cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev, + blk_mq_rq_to_pdu(req)); + if (IS_ERR(cqr)) + return cqr; + ccw = cqr->cpaddr; + /* First ccw is define extent. */ + define_extent(ccw++, cqr->data, rq_data_dir(req), + block->bp_block, blk_rq_pos(req), blk_rq_sectors(req)); + /* Build locate_record + read/write ccws. */ + idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data)); + LO_data = (struct LO_fba_data *) (idaws + cidaw); + /* Locate record for all blocks for smart devices. */ + if (private->rdc_data.mode.bits.data_chain != 0) { + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count); + } + recid = first_rec; + rq_for_each_segment(bv, req, iter) { + dst = page_address(bv.bv_page) + bv.bv_offset; + if (dasd_page_cache) { + char *copy = kmem_cache_alloc(dasd_page_cache, + GFP_DMA | __GFP_NOWARN); + if (copy && rq_data_dir(req) == WRITE) + memcpy(copy + bv.bv_offset, dst, bv.bv_len); + if (copy) + dst = copy + bv.bv_offset; + } + for (off = 0; off < bv.bv_len; off += blksize) { + /* Locate record for stupid devices. */ + if (private->rdc_data.mode.bits.data_chain == 0) { + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw, LO_data++, + rq_data_dir(req), + recid - first_rec, 1); + ccw->flags = CCW_FLAG_CC; + ccw++; + } else { + if (recid > first_rec) + ccw[-1].flags |= CCW_FLAG_DC; + else + ccw[-1].flags |= CCW_FLAG_CC; + } + ccw->cmd_code = cmd; + ccw->count = block->bp_block; + if (idal_is_needed(dst, blksize)) { + ccw->cda = (__u32)(addr_t) idaws; + ccw->flags = CCW_FLAG_IDA; + idaws = idal_create_words(idaws, dst, blksize); + } else { + ccw->cda = (__u32)(addr_t) dst; + ccw->flags = 0; + } + ccw++; + dst += blksize; + recid++; + } + } + if (blk_noretry_request(req) || + block->base->features & DASD_FEATURE_FAILFAST) + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + cqr->startdev = memdev; + cqr->memdev = memdev; + cqr->block = block; + cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */ + cqr->retries = memdev->default_retries; + cqr->buildclk = get_tod_clock(); + cqr->status = DASD_CQR_FILLED; + return cqr; +} + +static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev, + struct dasd_block *block, + struct request *req) +{ + if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES) + return dasd_fba_build_cp_discard(memdev, block, req); + else + return dasd_fba_build_cp_regular(memdev, block, req); +} + +static int +dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req) +{ + struct dasd_fba_private *private = cqr->block->base->private; + struct ccw1 *ccw; + struct req_iterator iter; + struct bio_vec bv; + char *dst, *cda; + unsigned int blksize, off; + int status; + + if (!dasd_page_cache) + goto out; + blksize = cqr->block->bp_block; + ccw = cqr->cpaddr; + /* Skip over define extent & locate record. */ + ccw++; + if (private->rdc_data.mode.bits.data_chain != 0) + ccw++; + rq_for_each_segment(bv, req, iter) { + dst = page_address(bv.bv_page) + bv.bv_offset; + for (off = 0; off < bv.bv_len; off += blksize) { + /* Skip locate record. */ + if (private->rdc_data.mode.bits.data_chain == 0) + ccw++; + if (dst) { + if (ccw->flags & CCW_FLAG_IDA) + cda = *((char **)((addr_t) ccw->cda)); + else + cda = (char *)((addr_t) ccw->cda); + if (dst != cda) { + if (rq_data_dir(req) == READ) + memcpy(dst, cda, bv.bv_len); + kmem_cache_free(dasd_page_cache, + (void *)((addr_t)cda & PAGE_MASK)); + } + dst = NULL; + } + ccw++; + } + } +out: + status = cqr->status == DASD_CQR_DONE; + dasd_sfree_request(cqr, cqr->memdev); + return status; +} + +static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr) +{ + if (cqr->retries < 0) + cqr->status = DASD_CQR_FAILED; + else + cqr->status = DASD_CQR_FILLED; +}; + +static int +dasd_fba_fill_info(struct dasd_device * device, + struct dasd_information2_t * info) +{ + struct dasd_fba_private *private = device->private; + + info->label_block = 1; + info->FBA_layout = 1; + info->format = DASD_FORMAT_LDL; + info->characteristics_size = sizeof(private->rdc_data); + memcpy(info->characteristics, &private->rdc_data, + sizeof(private->rdc_data)); + info->confdata_size = 0; + return 0; +} + +static void +dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb, + char *reason) +{ + u64 *sense; + + sense = (u64 *) dasd_get_sense(irb); + if (sense) { + DBF_DEV_EVENT(DBF_EMERG, device, + "%s: %s %02x%02x%02x %016llx %016llx %016llx " + "%016llx", reason, + scsw_is_tm(&irb->scsw) ? "t" : "c", + scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw), + scsw_dstat(&irb->scsw), sense[0], sense[1], + sense[2], sense[3]); + } else { + DBF_DEV_EVENT(DBF_EMERG, device, "%s", + "SORRY - NO VALID SENSE AVAILABLE\n"); + } +} + + +static void +dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, + struct irb *irb) +{ + char *page; + struct ccw1 *act, *end, *last; + int len, sl, sct, count; + + page = (char *) get_zeroed_page(GFP_ATOMIC); + if (page == NULL) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "No memory to dump sense data"); + return; + } + len = sprintf(page, PRINTK_HEADER + " I/O status report for device %s:\n", + dev_name(&device->cdev->dev)); + len += sprintf(page + len, PRINTK_HEADER + " in req: %p CS: 0x%02X DS: 0x%02X\n", req, + irb->scsw.cmd.cstat, irb->scsw.cmd.dstat); + len += sprintf(page + len, PRINTK_HEADER + " device %s: Failing CCW: %p\n", + dev_name(&device->cdev->dev), + (void *) (addr_t) irb->scsw.cmd.cpa); + if (irb->esw.esw0.erw.cons) { + for (sl = 0; sl < 4; sl++) { + len += sprintf(page + len, PRINTK_HEADER + " Sense(hex) %2d-%2d:", + (8 * sl), ((8 * sl) + 7)); + + for (sct = 0; sct < 8; sct++) { + len += sprintf(page + len, " %02x", + irb->ecw[8 * sl + sct]); + } + len += sprintf(page + len, "\n"); + } + } else { + len += sprintf(page + len, PRINTK_HEADER + " SORRY - NO VALID SENSE AVAILABLE\n"); + } + printk(KERN_ERR "%s", page); + + /* dump the Channel Program */ + /* print first CCWs (maximum 8) */ + act = req->cpaddr; + for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++); + end = min(act + 8, last); + len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req); + while (act <= end) { + len += sprintf(page + len, PRINTK_HEADER + " CCW %p: %08X %08X DAT:", + act, ((int *) act)[0], ((int *) act)[1]); + for (count = 0; count < 32 && count < act->count; + count += sizeof(int)) + len += sprintf(page + len, " %08X", + ((int *) (addr_t) act->cda) + [(count>>2)]); + len += sprintf(page + len, "\n"); + act++; + } + printk(KERN_ERR "%s", page); + + + /* print failing CCW area */ + len = 0; + if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) { + act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2; + len += sprintf(page + len, PRINTK_HEADER "......\n"); + } + end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last); + while (act <= end) { + len += sprintf(page + len, PRINTK_HEADER + " CCW %p: %08X %08X DAT:", + act, ((int *) act)[0], ((int *) act)[1]); + for (count = 0; count < 32 && count < act->count; + count += sizeof(int)) + len += sprintf(page + len, " %08X", + ((int *) (addr_t) act->cda) + [(count>>2)]); + len += sprintf(page + len, "\n"); + act++; + } + + /* print last CCWs */ + if (act < last - 2) { + act = last - 2; + len += sprintf(page + len, PRINTK_HEADER "......\n"); + } + while (act <= last) { + len += sprintf(page + len, PRINTK_HEADER + " CCW %p: %08X %08X DAT:", + act, ((int *) act)[0], ((int *) act)[1]); + for (count = 0; count < 32 && count < act->count; + count += sizeof(int)) + len += sprintf(page + len, " %08X", + ((int *) (addr_t) act->cda) + [(count>>2)]); + len += sprintf(page + len, "\n"); + act++; + } + if (len > 0) + printk(KERN_ERR "%s", page); + free_page((unsigned long) page); +} + +/* + * max_blocks is dependent on the amount of storage that is available + * in the static io buffer for each device. Currently each device has + * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has + * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use + * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In + * addition we have one define extent ccw + 16 bytes of data and a + * locate record ccw for each block (stupid devices!) + 16 bytes of data. + * That makes: + * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum. + * We want to fit two into the available memory so that we can immediately + * start the next request if one finishes off. That makes 100.1 blocks + * for one request. Give a little safety and the result is 96. + */ +static struct dasd_discipline dasd_fba_discipline = { + .owner = THIS_MODULE, + .name = "FBA ", + .ebcname = "FBA ", + .max_blocks = 96, + .check_device = dasd_fba_check_characteristics, + .do_analysis = dasd_fba_do_analysis, + .verify_path = dasd_generic_verify_path, + .fill_geometry = dasd_fba_fill_geometry, + .start_IO = dasd_start_IO, + .term_IO = dasd_term_IO, + .handle_terminated_request = dasd_fba_handle_terminated_request, + .erp_action = dasd_fba_erp_action, + .erp_postaction = dasd_fba_erp_postaction, + .check_for_device_change = dasd_fba_check_for_device_change, + .build_cp = dasd_fba_build_cp, + .free_cp = dasd_fba_free_cp, + .dump_sense = dasd_fba_dump_sense, + .dump_sense_dbf = dasd_fba_dump_sense_dbf, + .fill_info = dasd_fba_fill_info, +}; + +static int __init +dasd_fba_init(void) +{ + int ret; + + ASCEBC(dasd_fba_discipline.ebcname, 4); + + dasd_fba_zero_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!dasd_fba_zero_page) + return -ENOMEM; + + ret = ccw_driver_register(&dasd_fba_driver); + if (!ret) + wait_for_device_probe(); + + return ret; +} + +static void __exit +dasd_fba_cleanup(void) +{ + ccw_driver_unregister(&dasd_fba_driver); + free_page((unsigned long)dasd_fba_zero_page); +} + +module_init(dasd_fba_init); +module_exit(dasd_fba_cleanup); diff --git a/drivers/s390/block/dasd_fba.h b/drivers/s390/block/dasd_fba.h new file mode 100644 index 000000000..b14bf1b2c --- /dev/null +++ b/drivers/s390/block/dasd_fba.h @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Author(s)......: Holger Smolinski + * Bugreports.to..: + * Coypright IBM Corp. 1999, 2000 + * + */ + +#ifndef DASD_FBA_H +#define DASD_FBA_H + +struct DE_fba_data { + struct { + unsigned char perm:2; /* Permissions on this extent */ + unsigned char zero:2; /* Must be zero */ + unsigned char da:1; /* usually zero */ + unsigned char diag:1; /* allow diagnose */ + unsigned char zero2:2; /* zero */ + } __attribute__ ((packed)) mask; + __u8 zero; /* Must be zero */ + __u16 blk_size; /* Blocksize */ + __u32 ext_loc; /* Extent locator */ + __u32 ext_beg; /* logical number of block 0 in extent */ + __u32 ext_end; /* logocal number of last block in extent */ +} __attribute__ ((packed)); + +struct LO_fba_data { + struct { + unsigned char zero:4; + unsigned char cmd:4; + } __attribute__ ((packed)) operation; + __u8 auxiliary; + __u16 blk_ct; + __u32 blk_nr; +} __attribute__ ((packed)); + +struct dasd_fba_characteristics { + union { + __u8 c; + struct { + unsigned char reserved:1; + unsigned char overrunnable:1; + unsigned char burst_byte:1; + unsigned char data_chain:1; + unsigned char zeros:4; + } __attribute__ ((packed)) bits; + } __attribute__ ((packed)) mode; + union { + __u8 c; + struct { + unsigned char zero0:1; + unsigned char removable:1; + unsigned char shared:1; + unsigned char zero1:1; + unsigned char mam:1; + unsigned char zeros:3; + } __attribute__ ((packed)) bits; + } __attribute__ ((packed)) features; + __u8 dev_class; + __u8 unit_type; + __u16 blk_size; + __u32 blk_per_cycl; + __u32 blk_per_bound; + __u32 blk_bdsa; + __u32 reserved0; + __u16 reserved1; + __u16 blk_ce; + __u32 reserved2; + __u16 reserved3; +} __attribute__ ((packed)); + +#endif /* DASD_FBA_H */ diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c new file mode 100644 index 000000000..5542d9ead --- /dev/null +++ b/drivers/s390/block/dasd_genhd.c @@ -0,0 +1,191 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Holger Smolinski + * Horst Hummel + * Carsten Otte + * Martin Schwidefsky + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2001 + * + * gendisk related functions for the dasd driver. + * + */ + +#define KMSG_COMPONENT "dasd" + +#include +#include +#include + +#include + +/* This is ugly... */ +#define PRINTK_HEADER "dasd_gendisk:" + +#include "dasd_int.h" + +/* + * Allocate and register gendisk structure for device. + */ +int dasd_gendisk_alloc(struct dasd_block *block) +{ + struct gendisk *gdp; + struct dasd_device *base; + int len; + + /* Make sure the minor for this device exists. */ + base = block->base; + if (base->devindex >= DASD_PER_MAJOR) + return -EBUSY; + + gdp = alloc_disk(1 << DASD_PARTN_BITS); + if (!gdp) + return -ENOMEM; + + /* Initialize gendisk structure. */ + gdp->major = DASD_MAJOR; + gdp->first_minor = base->devindex << DASD_PARTN_BITS; + gdp->fops = &dasd_device_operations; + + /* + * Set device name. + * dasda - dasdz : 26 devices + * dasdaa - dasdzz : 676 devices, added up = 702 + * dasdaaa - dasdzzz : 17576 devices, added up = 18278 + * dasdaaaa - dasdzzzz : 456976 devices, added up = 475252 + */ + len = sprintf(gdp->disk_name, "dasd"); + if (base->devindex > 25) { + if (base->devindex > 701) { + if (base->devindex > 18277) + len += sprintf(gdp->disk_name + len, "%c", + 'a'+(((base->devindex-18278) + /17576)%26)); + len += sprintf(gdp->disk_name + len, "%c", + 'a'+(((base->devindex-702)/676)%26)); + } + len += sprintf(gdp->disk_name + len, "%c", + 'a'+(((base->devindex-26)/26)%26)); + } + len += sprintf(gdp->disk_name + len, "%c", 'a'+(base->devindex%26)); + + if (base->features & DASD_FEATURE_READONLY || + test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) + set_disk_ro(gdp, 1); + dasd_add_link_to_gendisk(gdp, base); + gdp->queue = block->request_queue; + block->gdp = gdp; + set_capacity(block->gdp, 0); + device_add_disk(&base->cdev->dev, block->gdp, NULL); + return 0; +} + +/* + * Unregister and free gendisk structure for device. + */ +void dasd_gendisk_free(struct dasd_block *block) +{ + if (block->gdp) { + del_gendisk(block->gdp); + block->gdp->private_data = NULL; + put_disk(block->gdp); + block->gdp = NULL; + } +} + +/* + * Trigger a partition detection. + */ +int dasd_scan_partitions(struct dasd_block *block) +{ + struct block_device *bdev; + int rc; + + bdev = bdget_disk(block->gdp, 0); + if (!bdev) { + DBF_DEV_EVENT(DBF_ERR, block->base, "%s", + "scan partitions error, bdget returned NULL"); + return -ENODEV; + } + + rc = blkdev_get(bdev, FMODE_READ, NULL); + if (rc < 0) { + DBF_DEV_EVENT(DBF_ERR, block->base, + "scan partitions error, blkdev_get returned %d", + rc); + return -ENODEV; + } + + rc = blkdev_reread_part(bdev); + if (rc) + DBF_DEV_EVENT(DBF_ERR, block->base, + "scan partitions error, rc %d", rc); + + /* + * Since the matching blkdev_put call to the blkdev_get in + * this function is not called before dasd_destroy_partitions + * the offline open_count limit needs to be increased from + * 0 to 1. This is done by setting device->bdev (see + * dasd_generic_set_offline). As long as the partition + * detection is running no offline should be allowed. That + * is why the assignment to device->bdev is done AFTER + * the BLKRRPART ioctl. + */ + block->bdev = bdev; + return 0; +} + +/* + * Remove all inodes in the system for a device, delete the + * partitions and make device unusable by setting its size to zero. + */ +void dasd_destroy_partitions(struct dasd_block *block) +{ + /* The two structs have 168/176 byte on 31/64 bit. */ + struct blkpg_partition bpart; + struct blkpg_ioctl_arg barg; + struct block_device *bdev; + + /* + * Get the bdev pointer from the device structure and clear + * device->bdev to lower the offline open_count limit again. + */ + bdev = block->bdev; + block->bdev = NULL; + + /* + * See fs/partition/check.c:delete_partition + * Can't call delete_partitions directly. Use ioctl. + * The ioctl also does locking and invalidation. + */ + memset(&bpart, 0, sizeof(struct blkpg_partition)); + memset(&barg, 0, sizeof(struct blkpg_ioctl_arg)); + barg.data = (void __force __user *) &bpart; + barg.op = BLKPG_DEL_PARTITION; + for (bpart.pno = block->gdp->minors - 1; bpart.pno > 0; bpart.pno--) + ioctl_by_bdev(bdev, BLKPG, (unsigned long) &barg); + + invalidate_partition(block->gdp, 0); + /* Matching blkdev_put to the blkdev_get in dasd_scan_partitions. */ + blkdev_put(bdev, FMODE_READ); + set_capacity(block->gdp, 0); +} + +int dasd_gendisk_init(void) +{ + int rc; + + /* Register to static dasd major 94 */ + rc = register_blkdev(DASD_MAJOR, "dasd"); + if (rc != 0) { + pr_warn("Registering the device driver with major number %d failed\n", + DASD_MAJOR); + return rc; + } + return 0; +} + +void dasd_gendisk_exit(void) +{ + unregister_blkdev(DASD_MAJOR, "dasd"); +} diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h new file mode 100644 index 000000000..de6b96036 --- /dev/null +++ b/drivers/s390/block/dasd_int.h @@ -0,0 +1,1254 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Author(s)......: Holger Smolinski + * Horst Hummel + * Martin Schwidefsky + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2009 + */ + +#ifndef DASD_INT_H +#define DASD_INT_H + +/* we keep old device allocation scheme; IOW, minors are still in 0..255 */ +#define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS)) +#define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1) + +/* + * States a dasd device can have: + * new: the dasd_device structure is allocated. + * known: the discipline for the device is identified. + * basic: the device can do basic i/o. + * unfmt: the device could not be analyzed (format is unknown). + * ready: partition detection is done and the device is can do block io. + * online: the device accepts requests from the block device queue. + * + * Things to do for startup state transitions: + * new -> known: find discipline for the device and create devfs entries. + * known -> basic: request irq line for the device. + * basic -> ready: do the initial analysis, e.g. format detection, + * do block device setup and detect partitions. + * ready -> online: schedule the device tasklet. + * Things to do for shutdown state transitions: + * online -> ready: just set the new device state. + * ready -> basic: flush requests from the block device layer, clear + * partition information and reset format information. + * basic -> known: terminate all requests and free irq. + * known -> new: remove devfs entries and forget discipline. + */ + +#define DASD_STATE_NEW 0 +#define DASD_STATE_KNOWN 1 +#define DASD_STATE_BASIC 2 +#define DASD_STATE_UNFMT 3 +#define DASD_STATE_READY 4 +#define DASD_STATE_ONLINE 5 + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* DASD discipline magic */ +#define DASD_ECKD_MAGIC 0xC5C3D2C4 +#define DASD_DIAG_MAGIC 0xC4C9C1C7 +#define DASD_FBA_MAGIC 0xC6C2C140 + +/* + * SECTION: Type definitions + */ +struct dasd_device; +struct dasd_block; + +/* BIT DEFINITIONS FOR SENSE DATA */ +#define DASD_SENSE_BIT_0 0x80 +#define DASD_SENSE_BIT_1 0x40 +#define DASD_SENSE_BIT_2 0x20 +#define DASD_SENSE_BIT_3 0x10 + +/* BIT DEFINITIONS FOR SIM SENSE */ +#define DASD_SIM_SENSE 0x0F +#define DASD_SIM_MSG_TO_OP 0x03 +#define DASD_SIM_LOG 0x0C + +/* lock class for nested cdev lock */ +#define CDEV_NESTED_FIRST 1 +#define CDEV_NESTED_SECOND 2 + +/* + * SECTION: MACROs for klogd and s390 debug feature (dbf) + */ +#define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \ +do { \ + debug_sprintf_event(d_device->debug_area, \ + d_level, \ + d_str "\n", \ + d_data); \ +} while(0) + +#define DBF_EVENT(d_level, d_str, d_data...)\ +do { \ + debug_sprintf_event(dasd_debug_area, \ + d_level,\ + d_str "\n", \ + d_data); \ +} while(0) + +#define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \ +do { \ + struct ccw_dev_id __dev_id; \ + ccw_device_get_id(d_cdev, &__dev_id); \ + debug_sprintf_event(dasd_debug_area, \ + d_level, \ + "0.%x.%04x " d_str "\n", \ + __dev_id.ssid, __dev_id.devno, d_data); \ +} while (0) + +/* limit size for an errorstring */ +#define ERRORLENGTH 30 + +/* definition of dbf debug levels */ +#define DBF_EMERG 0 /* system is unusable */ +#define DBF_ALERT 1 /* action must be taken immediately */ +#define DBF_CRIT 2 /* critical conditions */ +#define DBF_ERR 3 /* error conditions */ +#define DBF_WARNING 4 /* warning conditions */ +#define DBF_NOTICE 5 /* normal but significant condition */ +#define DBF_INFO 6 /* informational */ +#define DBF_DEBUG 6 /* debug-level messages */ + +/* messages to be written via klogd and dbf */ +#define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\ +do { \ + printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ + dev_name(&d_device->cdev->dev), d_args); \ + DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \ +} while(0) + +#define MESSAGE(d_loglevel,d_string,d_args...)\ +do { \ + printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ + DBF_EVENT(DBF_ALERT, d_string, d_args); \ +} while(0) + +/* messages to be written via klogd only */ +#define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\ +do { \ + printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ + dev_name(&d_device->cdev->dev), d_args); \ +} while(0) + +#define MESSAGE_LOG(d_loglevel,d_string,d_args...)\ +do { \ + printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ +} while(0) + +/* Macro to calculate number of blocks per page */ +#define BLOCKS_PER_PAGE(blksize) (PAGE_SIZE / blksize) + +struct dasd_ccw_req { + unsigned int magic; /* Eye catcher */ + int intrc; /* internal error, e.g. from start_IO */ + struct list_head devlist; /* for dasd_device request queue */ + struct list_head blocklist; /* for dasd_block request queue */ + struct dasd_block *block; /* the originating block device */ + struct dasd_device *memdev; /* the device used to allocate this */ + struct dasd_device *startdev; /* device the request is started on */ + struct dasd_device *basedev; /* base device if no block->base */ + void *cpaddr; /* address of ccw or tcw */ + short retries; /* A retry counter */ + unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */ + char status; /* status of this request */ + char lpm; /* logical path mask */ + unsigned long flags; /* flags of this request */ + struct dasd_queue *dq; + unsigned long starttime; /* jiffies time of request start */ + unsigned long expires; /* expiration period in jiffies */ + void *data; /* pointer to data area */ + struct irb irb; /* device status in case of an error */ + struct dasd_ccw_req *refers; /* ERP-chain queueing. */ + void *function; /* originating ERP action */ + void *mem_chunk; + + unsigned long buildclk; /* TOD-clock of request generation */ + unsigned long startclk; /* TOD-clock of request start */ + unsigned long stopclk; /* TOD-clock of request interrupt */ + unsigned long endclk; /* TOD-clock of request termination */ + + void (*callback)(struct dasd_ccw_req *, void *data); + void *callback_data; +}; + +/* + * dasd_ccw_req -> status can be: + */ +#define DASD_CQR_FILLED 0x00 /* request is ready to be processed */ +#define DASD_CQR_DONE 0x01 /* request is completed successfully */ +#define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */ +#define DASD_CQR_IN_ERP 0x03 /* request is in recovery */ +#define DASD_CQR_FAILED 0x04 /* request is finally failed */ +#define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */ + +#define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */ +#define DASD_CQR_IN_IO 0x81 /* request is currently in IO */ +#define DASD_CQR_ERROR 0x82 /* request is completed with error */ +#define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */ +#define DASD_CQR_CLEARED 0x84 /* request was cleared */ +#define DASD_CQR_SUCCESS 0x85 /* request was successful */ + +/* default expiration time*/ +#define DASD_EXPIRES 300 +#define DASD_EXPIRES_MAX 40000000 +#define DASD_RETRIES 256 +#define DASD_RETRIES_MAX 32768 + +/* per dasd_ccw_req flags */ +#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ +#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ +#define DASD_CQR_VERIFY_PATH 2 /* path verification request */ +#define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was + * stolen. Should not be combined with + * DASD_CQR_FLAGS_USE_ERP + */ +/* + * The following flags are used to suppress output of certain errors. + */ +#define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */ +#define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/ +#define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */ +#define DASD_CQR_SUPPRESS_CR 7 /* Suppress 'Command Reject' error */ + +#define DASD_REQ_PER_DEV 4 + +/* Signature for error recovery functions. */ +typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); + +/* + * A single CQR can only contain a maximum of 255 CCWs. It is limited by + * the locate record and locate record extended count value which can only hold + * 1 Byte max. + */ +#define DASD_CQR_MAX_CCW 255 + +/* + * Unique identifier for dasd device. + */ +#define UA_NOT_CONFIGURED 0x00 +#define UA_BASE_DEVICE 0x01 +#define UA_BASE_PAV_ALIAS 0x02 +#define UA_HYPER_PAV_ALIAS 0x03 + +struct dasd_uid { + __u8 type; + char vendor[4]; + char serial[15]; + __u16 ssid; + __u8 real_unit_addr; + __u8 base_unit_addr; + char vduit[33]; +}; + +/* + * the struct dasd_discipline is + * sth like a table of virtual functions, if you think of dasd_eckd + * inheriting dasd... + * no, currently we are not planning to reimplement the driver in C++ + */ +struct dasd_discipline { + struct module *owner; + char ebcname[8]; /* a name used for tagging and printks */ + char name[8]; /* a name used for tagging and printks */ + int max_blocks; /* maximum number of blocks to be chained */ + + struct list_head list; /* used for list of disciplines */ + + /* + * Device recognition functions. check_device is used to verify + * the sense data and the information returned by read device + * characteristics. It returns 0 if the discipline can be used + * for the device in question. uncheck_device is called during + * device shutdown to deregister a device from its discipline. + */ + int (*check_device) (struct dasd_device *); + void (*uncheck_device) (struct dasd_device *); + + /* + * do_analysis is used in the step from device state "basic" to + * state "accept". It returns 0 if the device can be made ready, + * it returns -EMEDIUMTYPE if the device can't be made ready or + * -EAGAIN if do_analysis started a ccw that needs to complete + * before the analysis may be repeated. + */ + int (*do_analysis) (struct dasd_block *); + + /* + * This function is called, when new paths become available. + * Disciplins may use this callback to do necessary setup work, + * e.g. verify that new path is compatible with the current + * configuration. + */ + int (*verify_path)(struct dasd_device *, __u8); + + /* + * Last things to do when a device is set online, and first things + * when it is set offline. + */ + int (*basic_to_ready) (struct dasd_device *); + int (*online_to_ready) (struct dasd_device *); + int (*basic_to_known)(struct dasd_device *); + + /* (struct dasd_device *); + * Device operation functions. build_cp creates a ccw chain for + * a block device request, start_io starts the request and + * term_IO cancels it (e.g. in case of a timeout). format_device + * formats the device and check_device_format compares the format of + * a device with the expected format_data. + * handle_terminated_request allows to examine a cqr and prepare + * it for retry. + */ + struct dasd_ccw_req *(*build_cp) (struct dasd_device *, + struct dasd_block *, + struct request *); + int (*start_IO) (struct dasd_ccw_req *); + int (*term_IO) (struct dasd_ccw_req *); + void (*handle_terminated_request) (struct dasd_ccw_req *); + int (*format_device) (struct dasd_device *, + struct format_data_t *, int); + int (*check_device_format)(struct dasd_device *, + struct format_check_t *, int); + int (*free_cp) (struct dasd_ccw_req *, struct request *); + + /* + * Error recovery functions. examine_error() returns a value that + * indicates what to do for an error condition. If examine_error() + * returns 'dasd_era_recover' erp_action() is called to create a + * special error recovery ccw. erp_postaction() is called after + * an error recovery ccw has finished its execution. dump_sense + * is called for every error condition to print the sense data + * to the console. + */ + dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); + dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); + void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, + struct irb *); + void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); + void (*check_for_device_change) (struct dasd_device *, + struct dasd_ccw_req *, + struct irb *); + + /* i/o control functions. */ + int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); + int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); + int (*ioctl) (struct dasd_block *, unsigned int, void __user *); + + /* suspend/resume functions */ + int (*freeze) (struct dasd_device *); + int (*restore) (struct dasd_device *); + + /* reload device after state change */ + int (*reload) (struct dasd_device *); + + int (*get_uid) (struct dasd_device *, struct dasd_uid *); + void (*kick_validate) (struct dasd_device *); + int (*check_attention)(struct dasd_device *, __u8); + int (*host_access_count)(struct dasd_device *); + int (*hosts_print)(struct dasd_device *, struct seq_file *); + void (*handle_hpf_error)(struct dasd_device *, struct irb *); + void (*disable_hpf)(struct dasd_device *); + int (*hpf_enabled)(struct dasd_device *); + void (*reset_path)(struct dasd_device *, __u8); +}; + +extern struct dasd_discipline *dasd_diag_discipline_pointer; + +/* + * Notification numbers for extended error reporting notifications: + * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's + * eer pointer) is freed. The error reporting module needs to do all necessary + * cleanup steps. + * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). + */ +#define DASD_EER_DISABLE 0 +#define DASD_EER_TRIGGER 1 + +/* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ +#define DASD_EER_FATALERROR 1 +#define DASD_EER_NOPATH 2 +#define DASD_EER_STATECHANGE 3 +#define DASD_EER_PPRCSUSPEND 4 + +/* DASD path handling */ + +#define DASD_PATH_OPERATIONAL 1 +#define DASD_PATH_TBV 2 +#define DASD_PATH_PP 3 +#define DASD_PATH_NPP 4 +#define DASD_PATH_MISCABLED 5 +#define DASD_PATH_NOHPF 6 +#define DASD_PATH_CUIR 7 +#define DASD_PATH_IFCC 8 + +#define DASD_THRHLD_MAX 4294967295U +#define DASD_INTERVAL_MAX 4294967295U + +struct dasd_path { + unsigned long flags; + u8 cssid; + u8 ssid; + u8 chpid; + struct dasd_conf_data *conf_data; + atomic_t error_count; + unsigned long errorclk; +}; + + +struct dasd_profile_info { + /* legacy part of profile data, as in dasd_profile_info_t */ + unsigned int dasd_io_reqs; /* number of requests processed */ + unsigned int dasd_io_sects; /* number of sectors processed */ + unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ + unsigned int dasd_io_times[32]; /* histogram of requests's times */ + unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ + unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ + unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ + unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ + unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ + unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ + + /* new data */ + struct timespec64 starttod; /* time of start or last reset */ + unsigned int dasd_io_alias; /* requests using an alias */ + unsigned int dasd_io_tpm; /* requests using transport mode */ + unsigned int dasd_read_reqs; /* total number of read requests */ + unsigned int dasd_read_sects; /* total number read sectors */ + unsigned int dasd_read_alias; /* read request using an alias */ + unsigned int dasd_read_tpm; /* read requests in transport mode */ + unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ + unsigned int dasd_read_times[32]; /* histogram of requests's times */ + unsigned int dasd_read_time1[32]; /* hist. time from build to start */ + unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ + unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ + unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ + unsigned long dasd_sum_times; /* sum of request times */ + unsigned long dasd_sum_time_str; /* sum of time from build to start */ + unsigned long dasd_sum_time_irq; /* sum of time from start to irq */ + unsigned long dasd_sum_time_end; /* sum of time from irq to end */ +}; + +struct dasd_profile { + struct dentry *dentry; + struct dasd_profile_info *data; + spinlock_t lock; +}; + +struct dasd_device { + /* Block device stuff. */ + struct dasd_block *block; + + unsigned int devindex; + unsigned long flags; /* per device flags */ + unsigned short features; /* copy of devmap-features (read-only!) */ + + /* extended error reporting stuff (eer) */ + struct dasd_ccw_req *eer_cqr; + + /* Device discipline stuff. */ + struct dasd_discipline *discipline; + struct dasd_discipline *base_discipline; + void *private; + struct dasd_path path[8]; + __u8 opm; + + /* Device state and target state. */ + int state, target; + struct mutex state_mutex; + int stopped; /* device (ccw_device_start) was stopped */ + + /* reference count. */ + atomic_t ref_count; + + /* ccw queue and memory for static ccw/erp buffers. */ + struct list_head ccw_queue; + spinlock_t mem_lock; + void *ccw_mem; + void *erp_mem; + struct list_head ccw_chunks; + struct list_head erp_chunks; + + atomic_t tasklet_scheduled; + struct tasklet_struct tasklet; + struct work_struct kick_work; + struct work_struct restore_device; + struct work_struct reload_device; + struct work_struct kick_validate; + struct work_struct suc_work; + struct work_struct requeue_requests; + struct timer_list timer; + + debug_info_t *debug_area; + + struct ccw_device *cdev; + + /* hook for alias management */ + struct list_head alias_list; + + /* default expiration time in s */ + unsigned long default_expires; + unsigned long default_retries; + + unsigned long blk_timeout; + + unsigned long path_thrhld; + unsigned long path_interval; + + struct dentry *debugfs_dentry; + struct dentry *hosts_dentry; + struct dasd_profile profile; +}; + +struct dasd_block { + /* Block device stuff. */ + struct gendisk *gdp; + struct request_queue *request_queue; + spinlock_t request_queue_lock; + struct blk_mq_tag_set tag_set; + struct block_device *bdev; + atomic_t open_count; + + unsigned long blocks; /* size of volume in blocks */ + unsigned int bp_block; /* bytes per block */ + unsigned int s2b_shift; /* log2 (bp_block/512) */ + + struct dasd_device *base; + struct list_head ccw_queue; + spinlock_t queue_lock; + + atomic_t tasklet_scheduled; + struct tasklet_struct tasklet; + struct timer_list timer; + + struct dentry *debugfs_dentry; + struct dasd_profile profile; +}; + +struct dasd_attention_data { + struct dasd_device *device; + __u8 lpum; +}; + +struct dasd_queue { + spinlock_t lock; +}; + +/* reasons why device (ccw_device_start) was stopped */ +#define DASD_STOPPED_NOT_ACC 1 /* not accessible */ +#define DASD_STOPPED_QUIESCE 2 /* Quiesced */ +#define DASD_STOPPED_PENDING 4 /* long busy */ +#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ +#define DASD_STOPPED_SU 16 /* summary unit check handling */ +#define DASD_STOPPED_PM 32 /* pm state transition */ +#define DASD_UNRESUMED_PM 64 /* pm resume failed state */ + +/* per device flags */ +#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ +#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ +#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ +#define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't + * confuse this with the user specified + * read-only feature. + */ +#define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ +#define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ +#define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ +#define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/ +#define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ +#define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ +#define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */ +#define DASD_FLAG_SUC 14 /* unhandled summary unit check */ + +#define DASD_SLEEPON_START_TAG ((void *) 1) +#define DASD_SLEEPON_END_TAG ((void *) 2) + +void dasd_put_device_wake(struct dasd_device *); + +/* + * Reference count inliners + */ +static inline void +dasd_get_device(struct dasd_device *device) +{ + atomic_inc(&device->ref_count); +} + +static inline void +dasd_put_device(struct dasd_device *device) +{ + if (atomic_dec_return(&device->ref_count) == 0) + dasd_put_device_wake(device); +} + +/* + * The static memory in ccw_mem and erp_mem is managed by a sorted + * list of free memory chunks. + */ +struct dasd_mchunk +{ + struct list_head list; + unsigned long size; +} __attribute__ ((aligned(8))); + +static inline void +dasd_init_chunklist(struct list_head *chunk_list, void *mem, + unsigned long size) +{ + struct dasd_mchunk *chunk; + + INIT_LIST_HEAD(chunk_list); + chunk = (struct dasd_mchunk *) mem; + chunk->size = size - sizeof(struct dasd_mchunk); + list_add(&chunk->list, chunk_list); +} + +static inline void * +dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) +{ + struct dasd_mchunk *chunk, *tmp; + + size = (size + 7L) & -8L; + list_for_each_entry(chunk, chunk_list, list) { + if (chunk->size < size) + continue; + if (chunk->size > size + sizeof(struct dasd_mchunk)) { + char *endaddr = (char *) (chunk + 1) + chunk->size; + tmp = (struct dasd_mchunk *) (endaddr - size) - 1; + tmp->size = size; + chunk->size -= size + sizeof(struct dasd_mchunk); + chunk = tmp; + } else + list_del(&chunk->list); + return (void *) (chunk + 1); + } + return NULL; +} + +static inline void +dasd_free_chunk(struct list_head *chunk_list, void *mem) +{ + struct dasd_mchunk *chunk, *tmp; + struct list_head *p, *left; + + chunk = (struct dasd_mchunk *) + ((char *) mem - sizeof(struct dasd_mchunk)); + /* Find out the left neighbour in chunk_list. */ + left = chunk_list; + list_for_each(p, chunk_list) { + if (list_entry(p, struct dasd_mchunk, list) > chunk) + break; + left = p; + } + /* Try to merge with right neighbour = next element from left. */ + if (left->next != chunk_list) { + tmp = list_entry(left->next, struct dasd_mchunk, list); + if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { + list_del(&tmp->list); + chunk->size += tmp->size + sizeof(struct dasd_mchunk); + } + } + /* Try to merge with left neighbour. */ + if (left != chunk_list) { + tmp = list_entry(left, struct dasd_mchunk, list); + if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { + tmp->size += chunk->size + sizeof(struct dasd_mchunk); + return; + } + } + __list_add(&chunk->list, left, left->next); +} + +/* + * Check if bsize is in { 512, 1024, 2048, 4096 } + */ +static inline int +dasd_check_blocksize(int bsize) +{ + if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) + return -EMEDIUMTYPE; + return 0; +} + +/* externals in dasd.c */ +#define DASD_PROFILE_OFF 0 +#define DASD_PROFILE_ON 1 +#define DASD_PROFILE_GLOBAL_ONLY 2 + +extern debug_info_t *dasd_debug_area; +extern struct dasd_profile dasd_global_profile; +extern unsigned int dasd_global_profile_level; +extern const struct block_device_operations dasd_device_operations; + +extern struct kmem_cache *dasd_page_cache; + +struct dasd_ccw_req * +dasd_smalloc_request(int, int, int, struct dasd_device *, struct dasd_ccw_req *); +void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); +void dasd_wakeup_cb(struct dasd_ccw_req *, void *); + +struct dasd_device *dasd_alloc_device(void); +void dasd_free_device(struct dasd_device *); + +struct dasd_block *dasd_alloc_block(void); +void dasd_free_block(struct dasd_block *); + +enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved); + +void dasd_enable_device(struct dasd_device *); +void dasd_set_target_state(struct dasd_device *, int); +void dasd_kick_device(struct dasd_device *); +void dasd_restore_device(struct dasd_device *); +void dasd_reload_device(struct dasd_device *); +void dasd_schedule_requeue(struct dasd_device *); + +void dasd_add_request_head(struct dasd_ccw_req *); +void dasd_add_request_tail(struct dasd_ccw_req *); +int dasd_start_IO(struct dasd_ccw_req *); +int dasd_term_IO(struct dasd_ccw_req *); +void dasd_schedule_device_bh(struct dasd_device *); +void dasd_schedule_block_bh(struct dasd_block *); +int dasd_sleep_on(struct dasd_ccw_req *); +int dasd_sleep_on_queue(struct list_head *); +int dasd_sleep_on_immediatly(struct dasd_ccw_req *); +int dasd_sleep_on_interruptible(struct dasd_ccw_req *); +void dasd_device_set_timer(struct dasd_device *, int); +void dasd_device_clear_timer(struct dasd_device *); +void dasd_block_set_timer(struct dasd_block *, int); +void dasd_block_clear_timer(struct dasd_block *); +int dasd_cancel_req(struct dasd_ccw_req *); +int dasd_flush_device_queue(struct dasd_device *); +int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); +void dasd_generic_free_discipline(struct dasd_device *); +void dasd_generic_remove (struct ccw_device *cdev); +int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); +int dasd_generic_set_offline (struct ccw_device *cdev); +int dasd_generic_notify(struct ccw_device *, int); +int dasd_generic_last_path_gone(struct dasd_device *); +int dasd_generic_path_operational(struct dasd_device *); +void dasd_generic_shutdown(struct ccw_device *); + +void dasd_generic_handle_state_change(struct dasd_device *); +int dasd_generic_pm_freeze(struct ccw_device *); +int dasd_generic_restore_device(struct ccw_device *); +enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); +void dasd_generic_path_event(struct ccw_device *, int *); +int dasd_generic_verify_path(struct dasd_device *, __u8); + +int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); +char *dasd_get_sense(struct irb *); + +void dasd_device_set_stop_bits(struct dasd_device *, int); +void dasd_device_remove_stop_bits(struct dasd_device *, int); + +int dasd_device_is_ro(struct dasd_device *); + +void dasd_profile_reset(struct dasd_profile *); +int dasd_profile_on(struct dasd_profile *); +void dasd_profile_off(struct dasd_profile *); +char *dasd_get_user_string(const char __user *, size_t); + +/* externals in dasd_devmap.c */ +extern int dasd_max_devindex; +extern int dasd_probeonly; +extern int dasd_autodetect; +extern int dasd_nopav; +extern int dasd_nofcx; + +int dasd_devmap_init(void); +void dasd_devmap_exit(void); + +struct dasd_device *dasd_create_device(struct ccw_device *); +void dasd_delete_device(struct dasd_device *); + +int dasd_get_feature(struct ccw_device *, int); +int dasd_set_feature(struct ccw_device *, int, int); + +int dasd_add_sysfs_files(struct ccw_device *); +void dasd_remove_sysfs_files(struct ccw_device *); + +struct dasd_device *dasd_device_from_cdev(struct ccw_device *); +struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); +struct dasd_device *dasd_device_from_devindex(int); + +void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); +struct dasd_device *dasd_device_from_gendisk(struct gendisk *); + +int dasd_parse(void) __init; +int dasd_busid_known(const char *); + +/* externals in dasd_gendisk.c */ +int dasd_gendisk_init(void); +void dasd_gendisk_exit(void); +int dasd_gendisk_alloc(struct dasd_block *); +void dasd_gendisk_free(struct dasd_block *); +int dasd_scan_partitions(struct dasd_block *); +void dasd_destroy_partitions(struct dasd_block *); + +/* externals in dasd_ioctl.c */ +int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); + +/* externals in dasd_proc.c */ +int dasd_proc_init(void); +void dasd_proc_exit(void); + +/* externals in dasd_erp.c */ +struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); +struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); +struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, + struct dasd_device *); +void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); +void dasd_log_sense(struct dasd_ccw_req *, struct irb *); +void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); + +/* externals in dasd_3990_erp.c */ +struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); +void dasd_3990_erp_handle_sim(struct dasd_device *, char *); + +/* externals in dasd_eer.c */ +#ifdef CONFIG_DASD_EER +int dasd_eer_init(void); +void dasd_eer_exit(void); +int dasd_eer_enable(struct dasd_device *); +void dasd_eer_disable(struct dasd_device *); +void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, + unsigned int id); +void dasd_eer_snss(struct dasd_device *); + +static inline int dasd_eer_enabled(struct dasd_device *device) +{ + return device->eer_cqr != NULL; +} +#else +#define dasd_eer_init() (0) +#define dasd_eer_exit() do { } while (0) +#define dasd_eer_enable(d) (0) +#define dasd_eer_disable(d) do { } while (0) +#define dasd_eer_write(d,c,i) do { } while (0) +#define dasd_eer_snss(d) do { } while (0) +#define dasd_eer_enabled(d) (0) +#endif /* CONFIG_DASD_ERR */ + + +/* DASD path handling functions */ + +/* + * helper functions to modify bit masks for a given channel path for a device + */ +static inline int dasd_path_is_operational(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); +} + +static inline int dasd_path_need_verify(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_TBV, &device->path[chp].flags); +} + +static inline void dasd_path_verify(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_TBV, &device->path[chp].flags); +} + +static inline void dasd_path_clear_verify(struct dasd_device *device, int chp) +{ + __clear_bit(DASD_PATH_TBV, &device->path[chp].flags); +} + +static inline void dasd_path_clear_all_verify(struct dasd_device *device) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + dasd_path_clear_verify(device, chp); +} + +static inline void dasd_path_operational(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); + device->opm |= (0x80 >> chp); +} + +static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_NPP, &device->path[chp].flags); +} + +static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_NPP, &device->path[chp].flags); +} + +static inline void dasd_path_clear_nonpreferred(struct dasd_device *device, + int chp) +{ + __clear_bit(DASD_PATH_NPP, &device->path[chp].flags); +} + +static inline void dasd_path_preferred(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_PP, &device->path[chp].flags); +} + +static inline int dasd_path_is_preferred(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_PP, &device->path[chp].flags); +} + +static inline void dasd_path_clear_preferred(struct dasd_device *device, + int chp) +{ + __clear_bit(DASD_PATH_PP, &device->path[chp].flags); +} + +static inline void dasd_path_clear_oper(struct dasd_device *device, int chp) +{ + __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); + device->opm &= ~(0x80 >> chp); +} + +static inline void dasd_path_clear_cable(struct dasd_device *device, int chp) +{ + __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); +} + +static inline void dasd_path_cuir(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_CUIR, &device->path[chp].flags); +} + +static inline int dasd_path_is_cuir(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_CUIR, &device->path[chp].flags); +} + +static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp) +{ + __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags); +} + +static inline void dasd_path_ifcc(struct dasd_device *device, int chp) +{ + set_bit(DASD_PATH_IFCC, &device->path[chp].flags); +} + +static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_IFCC, &device->path[chp].flags); +} + +static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp) +{ + clear_bit(DASD_PATH_IFCC, &device->path[chp].flags); +} + +static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp) +{ + __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags); +} + +static inline void dasd_path_miscabled(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); +} + +static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); +} + +static inline void dasd_path_nohpf(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags); +} + +static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags); +} + +/* + * get functions for path masks + * will return a path masks for the given device + */ + +static inline __u8 dasd_path_get_opm(struct dasd_device *device) +{ + return device->opm; +} + +static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device) +{ + int chp; + __u8 tbvpm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_need_verify(device, chp)) + tbvpm |= 0x80 >> chp; + return tbvpm; +} + +static inline __u8 dasd_path_get_nppm(struct dasd_device *device) +{ + int chp; + __u8 npm = 0x00; + + for (chp = 0; chp < 8; chp++) { + if (dasd_path_is_nonpreferred(device, chp)) + npm |= 0x80 >> chp; + } + return npm; +} + +static inline __u8 dasd_path_get_ppm(struct dasd_device *device) +{ + int chp; + __u8 ppm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_preferred(device, chp)) + ppm |= 0x80 >> chp; + return ppm; +} + +static inline __u8 dasd_path_get_cablepm(struct dasd_device *device) +{ + int chp; + __u8 cablepm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_miscabled(device, chp)) + cablepm |= 0x80 >> chp; + return cablepm; +} + +static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device) +{ + int chp; + __u8 cuirpm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_cuir(device, chp)) + cuirpm |= 0x80 >> chp; + return cuirpm; +} + +static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device) +{ + int chp; + __u8 ifccpm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_ifcc(device, chp)) + ifccpm |= 0x80 >> chp; + return ifccpm; +} + +static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device) +{ + int chp; + __u8 hpfpm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_nohpf(device, chp)) + hpfpm |= 0x80 >> chp; + return hpfpm; +} + +/* + * add functions for path masks + * the existing path mask will be extended by the given path mask + */ +static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_verify(device, chp); +} + +static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device) +{ + int chp; + __u8 nopm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_nohpf(device, chp) || + dasd_path_is_ifcc(device, chp) || + dasd_path_is_cuir(device, chp) || + dasd_path_is_miscabled(device, chp)) + nopm |= 0x80 >> chp; + return nopm; +} + +static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) { + dasd_path_operational(device, chp); + /* + * if the path is used + * it should not be in one of the negative lists + */ + dasd_path_clear_nohpf(device, chp); + dasd_path_clear_cuir(device, chp); + dasd_path_clear_cable(device, chp); + dasd_path_clear_ifcc(device, chp); + } +} + +static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_miscabled(device, chp); +} + +static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_cuir(device, chp); +} + +static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_ifcc(device, chp); +} + +static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_nonpreferred(device, chp); +} + +static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_nohpf(device, chp); +} + +static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_preferred(device, chp); +} + +/* + * set functions for path masks + * the existing path mask will be replaced by the given path mask + */ +static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_verify(device, chp); + else + dasd_path_clear_verify(device, chp); +} + +static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) { + dasd_path_clear_oper(device, chp); + if (pm & (0x80 >> chp)) { + dasd_path_operational(device, chp); + /* + * if the path is used + * it should not be in one of the negative lists + */ + dasd_path_clear_nohpf(device, chp); + dasd_path_clear_cuir(device, chp); + dasd_path_clear_cable(device, chp); + dasd_path_clear_ifcc(device, chp); + } + } +} + +/* + * remove functions for path masks + * the existing path mask will be cleared with the given path mask + */ +static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) { + if (pm & (0x80 >> chp)) + dasd_path_clear_oper(device, chp); + } +} + +/* + * add the newly available path to the to be verified pm and remove it from + * normal operation until it is verified + */ +static inline void dasd_path_available(struct dasd_device *device, int chp) +{ + dasd_path_clear_oper(device, chp); + dasd_path_verify(device, chp); +} + +static inline void dasd_path_notoper(struct dasd_device *device, int chp) +{ + dasd_path_clear_oper(device, chp); + dasd_path_clear_preferred(device, chp); + dasd_path_clear_nonpreferred(device, chp); +} + +/* + * remove all paths from normal operation + */ +static inline void dasd_path_no_path(struct dasd_device *device) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + dasd_path_notoper(device, chp); + + dasd_path_clear_all_verify(device); +} + +/* end - path handling */ + +#endif /* DASD_H */ diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c new file mode 100644 index 000000000..2016e0ed5 --- /dev/null +++ b/drivers/s390/block/dasd_ioctl.c @@ -0,0 +1,618 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Holger Smolinski + * Horst Hummel + * Carsten Otte + * Martin Schwidefsky + * Bugreports.to..: + * Copyright IBM Corp. 1999, 2001 + * + * i/o controls for the dasd driver. + */ + +#define KMSG_COMPONENT "dasd" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* This is ugly... */ +#define PRINTK_HEADER "dasd_ioctl:" + +#include "dasd_int.h" + + +static int +dasd_ioctl_api_version(void __user *argp) +{ + int ver = DASD_API_VERSION; + return put_user(ver, (int __user *)argp); +} + +/* + * Enable device. + * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection + */ +static int +dasd_ioctl_enable(struct block_device *bdev) +{ + struct dasd_device *base; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + base = dasd_device_from_gendisk(bdev->bd_disk); + if (!base) + return -ENODEV; + + dasd_enable_device(base); + /* Formatting the dasd device can change the capacity. */ + mutex_lock(&bdev->bd_mutex); + i_size_write(bdev->bd_inode, + (loff_t)get_capacity(base->block->gdp) << 9); + mutex_unlock(&bdev->bd_mutex); + dasd_put_device(base); + return 0; +} + +/* + * Disable device. + * Used by dasdfmt. Disable I/O operations but allow ioctls. + */ +static int +dasd_ioctl_disable(struct block_device *bdev) +{ + struct dasd_device *base; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + base = dasd_device_from_gendisk(bdev->bd_disk); + if (!base) + return -ENODEV; + /* + * Man this is sick. We don't do a real disable but only downgrade + * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses + * BIODASDDISABLE to disable accesses to the device via the block + * device layer but it still wants to do i/o on the device by + * using the BIODASDFMT ioctl. Therefore the correct state for the + * device is DASD_STATE_BASIC that allows to do basic i/o. + */ + dasd_set_target_state(base, DASD_STATE_BASIC); + /* + * Set i_size to zero, since read, write, etc. check against this + * value. + */ + mutex_lock(&bdev->bd_mutex); + i_size_write(bdev->bd_inode, 0); + mutex_unlock(&bdev->bd_mutex); + dasd_put_device(base); + return 0; +} + +/* + * Quiesce device. + */ +static int dasd_ioctl_quiesce(struct dasd_block *block) +{ + unsigned long flags; + struct dasd_device *base; + + base = block->base; + if (!capable (CAP_SYS_ADMIN)) + return -EACCES; + + pr_info("%s: The DASD has been put in the quiesce " + "state\n", dev_name(&base->cdev->dev)); + spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); + dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); + spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); + return 0; +} + + +/* + * Resume device. + */ +static int dasd_ioctl_resume(struct dasd_block *block) +{ + unsigned long flags; + struct dasd_device *base; + + base = block->base; + if (!capable (CAP_SYS_ADMIN)) + return -EACCES; + + pr_info("%s: I/O operations have been resumed " + "on the DASD\n", dev_name(&base->cdev->dev)); + spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); + dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE); + spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); + + dasd_schedule_block_bh(block); + return 0; +} + +/* + * Abort all failfast I/O on a device. + */ +static int dasd_ioctl_abortio(struct dasd_block *block) +{ + unsigned long flags; + struct dasd_device *base; + struct dasd_ccw_req *cqr, *n; + + base = block->base; + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags)) + return 0; + DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set"); + + spin_lock_irqsave(&block->request_queue_lock, flags); + spin_lock(&block->queue_lock); + list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { + if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && + cqr->callback_data && + cqr->callback_data != DASD_SLEEPON_START_TAG && + cqr->callback_data != DASD_SLEEPON_END_TAG) { + spin_unlock(&block->queue_lock); + blk_abort_request(cqr->callback_data); + spin_lock(&block->queue_lock); + } + } + spin_unlock(&block->queue_lock); + spin_unlock_irqrestore(&block->request_queue_lock, flags); + + dasd_schedule_block_bh(block); + return 0; +} + +/* + * Allow I/O on a device + */ +static int dasd_ioctl_allowio(struct dasd_block *block) +{ + struct dasd_device *base; + + base = block->base; + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags)) + DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset"); + + return 0; +} + +/* + * performs formatting of _device_ according to _fdata_ + * Note: The discipline's format_function is assumed to deliver formatting + * commands to format multiple units of the device. In terms of the ECKD + * devices this means CCWs are generated to format multiple tracks. + */ +static int +dasd_format(struct dasd_block *block, struct format_data_t *fdata) +{ + struct dasd_device *base; + int rc; + + base = block->base; + if (base->discipline->format_device == NULL) + return -EPERM; + + if (base->state != DASD_STATE_BASIC) { + pr_warn("%s: The DASD cannot be formatted while it is enabled\n", + dev_name(&base->cdev->dev)); + return -EBUSY; + } + + DBF_DEV_EVENT(DBF_NOTICE, base, + "formatting units %u to %u (%u B blocks) flags %u", + fdata->start_unit, + fdata->stop_unit, fdata->blksize, fdata->intensity); + + /* Since dasdfmt keeps the device open after it was disabled, + * there still exists an inode for this device. + * We must update i_blkbits, otherwise we might get errors when + * enabling the device later. + */ + if (fdata->start_unit == 0) { + struct block_device *bdev = bdget_disk(block->gdp, 0); + bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); + bdput(bdev); + } + + rc = base->discipline->format_device(base, fdata, 1); + if (rc == -EAGAIN) + rc = base->discipline->format_device(base, fdata, 0); + + return rc; +} + +static int dasd_check_format(struct dasd_block *block, + struct format_check_t *cdata) +{ + struct dasd_device *base; + int rc; + + base = block->base; + if (!base->discipline->check_device_format) + return -ENOTTY; + + rc = base->discipline->check_device_format(base, cdata, 1); + if (rc == -EAGAIN) + rc = base->discipline->check_device_format(base, cdata, 0); + + return rc; +} + +/* + * Format device. + */ +static int +dasd_ioctl_format(struct block_device *bdev, void __user *argp) +{ + struct dasd_device *base; + struct format_data_t fdata; + int rc; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (!argp) + return -EINVAL; + base = dasd_device_from_gendisk(bdev->bd_disk); + if (!base) + return -ENODEV; + if (base->features & DASD_FEATURE_READONLY || + test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { + dasd_put_device(base); + return -EROFS; + } + if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) { + dasd_put_device(base); + return -EFAULT; + } + if (bdev != bdev->bd_contains) { + pr_warn("%s: The specified DASD is a partition and cannot be formatted\n", + dev_name(&base->cdev->dev)); + dasd_put_device(base); + return -EINVAL; + } + rc = dasd_format(base->block, &fdata); + dasd_put_device(base); + + return rc; +} + +/* + * Check device format + */ +static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp) +{ + struct format_check_t cdata; + struct dasd_device *base; + int rc = 0; + + if (!argp) + return -EINVAL; + + base = dasd_device_from_gendisk(bdev->bd_disk); + if (!base) + return -ENODEV; + if (bdev != bdev->bd_contains) { + pr_warn("%s: The specified DASD is a partition and cannot be checked\n", + dev_name(&base->cdev->dev)); + rc = -EINVAL; + goto out_err; + } + + if (copy_from_user(&cdata, argp, sizeof(cdata))) { + rc = -EFAULT; + goto out_err; + } + + rc = dasd_check_format(base->block, &cdata); + if (rc) + goto out_err; + + if (copy_to_user(argp, &cdata, sizeof(cdata))) + rc = -EFAULT; + +out_err: + dasd_put_device(base); + + return rc; +} + +#ifdef CONFIG_DASD_PROFILE +/* + * Reset device profile information + */ +static int dasd_ioctl_reset_profile(struct dasd_block *block) +{ + dasd_profile_reset(&block->profile); + return 0; +} + +/* + * Return device profile information + */ +static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) +{ + struct dasd_profile_info_t *data; + int rc = 0; + + data = kmalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + spin_lock_bh(&block->profile.lock); + if (block->profile.data) { + data->dasd_io_reqs = block->profile.data->dasd_io_reqs; + data->dasd_io_sects = block->profile.data->dasd_io_sects; + memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs, + sizeof(data->dasd_io_secs)); + memcpy(data->dasd_io_times, block->profile.data->dasd_io_times, + sizeof(data->dasd_io_times)); + memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps, + sizeof(data->dasd_io_timps)); + memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1, + sizeof(data->dasd_io_time1)); + memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2, + sizeof(data->dasd_io_time2)); + memcpy(data->dasd_io_time2ps, + block->profile.data->dasd_io_time2ps, + sizeof(data->dasd_io_time2ps)); + memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3, + sizeof(data->dasd_io_time3)); + memcpy(data->dasd_io_nr_req, + block->profile.data->dasd_io_nr_req, + sizeof(data->dasd_io_nr_req)); + spin_unlock_bh(&block->profile.lock); + } else { + spin_unlock_bh(&block->profile.lock); + rc = -EIO; + goto out; + } + if (copy_to_user(argp, data, sizeof(*data))) + rc = -EFAULT; +out: + kfree(data); + return rc; +} +#else +static int dasd_ioctl_reset_profile(struct dasd_block *block) +{ + return -ENOTTY; +} + +static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) +{ + return -ENOTTY; +} +#endif + +/* + * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. + */ +static int dasd_ioctl_information(struct dasd_block *block, + unsigned int cmd, void __user *argp) +{ + struct dasd_information2_t *dasd_info; + struct subchannel_id sch_id; + struct ccw_dev_id dev_id; + struct dasd_device *base; + struct ccw_device *cdev; + unsigned long flags; + int rc; + + base = block->base; + if (!base->discipline || !base->discipline->fill_info) + return -EINVAL; + + dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); + if (dasd_info == NULL) + return -ENOMEM; + + rc = base->discipline->fill_info(base, dasd_info); + if (rc) { + kfree(dasd_info); + return rc; + } + + cdev = base->cdev; + ccw_device_get_id(cdev, &dev_id); + ccw_device_get_schid(cdev, &sch_id); + + dasd_info->devno = dev_id.devno; + dasd_info->schid = sch_id.sch_no; + dasd_info->cu_type = cdev->id.cu_type; + dasd_info->cu_model = cdev->id.cu_model; + dasd_info->dev_type = cdev->id.dev_type; + dasd_info->dev_model = cdev->id.dev_model; + dasd_info->status = base->state; + /* + * The open_count is increased for every opener, that includes + * the blkdev_get in dasd_scan_partitions. + * This must be hidden from user-space. + */ + dasd_info->open_count = atomic_read(&block->open_count); + if (!block->bdev) + dasd_info->open_count++; + + /* + * check if device is really formatted + * LDL / CDL was returned by 'fill_info' + */ + if ((base->state < DASD_STATE_READY) || + (dasd_check_blocksize(block->bp_block))) + dasd_info->format = DASD_FORMAT_NONE; + + dasd_info->features |= + ((base->features & DASD_FEATURE_READONLY) != 0); + + memcpy(dasd_info->type, base->discipline->name, 4); + + if (block->request_queue->request_fn) { + struct list_head *l; +#ifdef DASD_EXTENDED_PROFILING + { + struct list_head *l; + spin_lock_irqsave(&block->lock, flags); + list_for_each(l, &block->request_queue->queue_head) + dasd_info->req_queue_len++; + spin_unlock_irqrestore(&block->lock, flags); + } +#endif /* DASD_EXTENDED_PROFILING */ + spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); + list_for_each(l, &base->ccw_queue) + dasd_info->chanq_len++; + spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), + flags); + } + + rc = 0; + if (copy_to_user(argp, dasd_info, + ((cmd == (unsigned int) BIODASDINFO2) ? + sizeof(struct dasd_information2_t) : + sizeof(struct dasd_information_t)))) + rc = -EFAULT; + kfree(dasd_info); + return rc; +} + +/* + * Set read only + */ +static int +dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) +{ + struct dasd_device *base; + int intval, rc; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + if (bdev != bdev->bd_contains) + // ro setting is not allowed for partitions + return -EINVAL; + if (get_user(intval, (int __user *)argp)) + return -EFAULT; + base = dasd_device_from_gendisk(bdev->bd_disk); + if (!base) + return -ENODEV; + if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { + dasd_put_device(base); + return -EROFS; + } + set_disk_ro(bdev->bd_disk, intval); + rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval); + dasd_put_device(base); + return rc; +} + +static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, + struct cmbdata __user *argp) +{ + size_t size = _IOC_SIZE(cmd); + struct cmbdata data; + int ret; + + ret = cmf_readall(block->base->cdev, &data); + if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) + return -EFAULT; + return ret; +} + +int dasd_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + struct dasd_block *block; + struct dasd_device *base; + void __user *argp; + int rc; + + if (is_compat_task()) + argp = compat_ptr(arg); + else + argp = (void __user *)arg; + + if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { + PRINT_DEBUG("empty data ptr"); + return -EINVAL; + } + + base = dasd_device_from_gendisk(bdev->bd_disk); + if (!base) + return -ENODEV; + block = base->block; + rc = 0; + switch (cmd) { + case BIODASDDISABLE: + rc = dasd_ioctl_disable(bdev); + break; + case BIODASDENABLE: + rc = dasd_ioctl_enable(bdev); + break; + case BIODASDQUIESCE: + rc = dasd_ioctl_quiesce(block); + break; + case BIODASDRESUME: + rc = dasd_ioctl_resume(block); + break; + case BIODASDABORTIO: + rc = dasd_ioctl_abortio(block); + break; + case BIODASDALLOWIO: + rc = dasd_ioctl_allowio(block); + break; + case BIODASDFMT: + rc = dasd_ioctl_format(bdev, argp); + break; + case BIODASDCHECKFMT: + rc = dasd_ioctl_check_format(bdev, argp); + break; + case BIODASDINFO: + rc = dasd_ioctl_information(block, cmd, argp); + break; + case BIODASDINFO2: + rc = dasd_ioctl_information(block, cmd, argp); + break; + case BIODASDPRRD: + rc = dasd_ioctl_read_profile(block, argp); + break; + case BIODASDPRRST: + rc = dasd_ioctl_reset_profile(block); + break; + case BLKROSET: + rc = dasd_ioctl_set_ro(bdev, argp); + break; + case DASDAPIVER: + rc = dasd_ioctl_api_version(argp); + break; + case BIODASDCMFENABLE: + rc = enable_cmf(base->cdev); + break; + case BIODASDCMFDISABLE: + rc = disable_cmf(base->cdev); + break; + case BIODASDREADALLCMB: + rc = dasd_ioctl_readall_cmb(block, cmd, argp); + break; + default: + /* if the discipline has an ioctl method try it. */ + rc = -ENOTTY; + if (base->discipline->ioctl) + rc = base->discipline->ioctl(block, cmd, argp); + } + dasd_put_device(base); + return rc; +} diff --git a/drivers/s390/block/dasd_proc.c b/drivers/s390/block/dasd_proc.c new file mode 100644 index 000000000..5cb80c645 --- /dev/null +++ b/drivers/s390/block/dasd_proc.c @@ -0,0 +1,370 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author(s)......: Holger Smolinski + * Horst Hummel + * Carsten Otte + * Martin Schwidefsky + * Bugreports.to..: + * Coypright IBM Corp. 1999, 2002 + * + * /proc interface for the dasd driver. + * + */ + +#define KMSG_COMPONENT "dasd" + +#include +#include +#include +#include +#include +#include + +#include +#include + +/* This is ugly... */ +#define PRINTK_HEADER "dasd_proc:" + +#include "dasd_int.h" + +static struct proc_dir_entry *dasd_proc_root_entry = NULL; +static struct proc_dir_entry *dasd_devices_entry = NULL; +static struct proc_dir_entry *dasd_statistics_entry = NULL; + +static int +dasd_devices_show(struct seq_file *m, void *v) +{ + struct dasd_device *device; + struct dasd_block *block; + char *substr; + + device = dasd_device_from_devindex((unsigned long) v - 1); + if (IS_ERR(device)) + return 0; + if (device->block) + block = device->block; + else { + dasd_put_device(device); + return 0; + } + /* Print device number. */ + seq_printf(m, "%s", dev_name(&device->cdev->dev)); + /* Print discipline string. */ + if (device->discipline != NULL) + seq_printf(m, "(%s)", device->discipline->name); + else + seq_printf(m, "(none)"); + /* Print kdev. */ + if (block->gdp) + seq_printf(m, " at (%3d:%6d)", + MAJOR(disk_devt(block->gdp)), + MINOR(disk_devt(block->gdp))); + else + seq_printf(m, " at (???:??????)"); + /* Print device name. */ + if (block->gdp) + seq_printf(m, " is %-8s", block->gdp->disk_name); + else + seq_printf(m, " is ????????"); + /* Print devices features. */ + substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; + seq_printf(m, "%4s: ", substr); + /* Print device status information. */ + switch (device->state) { + case DASD_STATE_NEW: + seq_printf(m, "new"); + break; + case DASD_STATE_KNOWN: + seq_printf(m, "detected"); + break; + case DASD_STATE_BASIC: + seq_printf(m, "basic"); + break; + case DASD_STATE_UNFMT: + seq_printf(m, "unformatted"); + break; + case DASD_STATE_READY: + case DASD_STATE_ONLINE: + seq_printf(m, "active "); + if (dasd_check_blocksize(block->bp_block)) + seq_printf(m, "n/f "); + else + seq_printf(m, + "at blocksize: %u, %lu blocks, %lu MB", + block->bp_block, block->blocks, + ((block->bp_block >> 9) * + block->blocks) >> 11); + break; + default: + seq_printf(m, "no stat"); + break; + } + dasd_put_device(device); + if (dasd_probeonly) + seq_printf(m, "(probeonly)"); + seq_printf(m, "\n"); + return 0; +} + +static void *dasd_devices_start(struct seq_file *m, loff_t *pos) +{ + if (*pos >= dasd_max_devindex) + return NULL; + return (void *)((unsigned long) *pos + 1); +} + +static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) +{ + ++*pos; + return dasd_devices_start(m, pos); +} + +static void dasd_devices_stop(struct seq_file *m, void *v) +{ +} + +static const struct seq_operations dasd_devices_seq_ops = { + .start = dasd_devices_start, + .next = dasd_devices_next, + .stop = dasd_devices_stop, + .show = dasd_devices_show, +}; + +#ifdef CONFIG_DASD_PROFILE +static int dasd_stats_all_block_on(void) +{ + int i, rc; + struct dasd_device *device; + + rc = 0; + for (i = 0; i < dasd_max_devindex; ++i) { + device = dasd_device_from_devindex(i); + if (IS_ERR(device)) + continue; + if (device->block) + rc = dasd_profile_on(&device->block->profile); + dasd_put_device(device); + if (rc) + return rc; + } + return 0; +} + +static void dasd_stats_all_block_off(void) +{ + int i; + struct dasd_device *device; + + for (i = 0; i < dasd_max_devindex; ++i) { + device = dasd_device_from_devindex(i); + if (IS_ERR(device)) + continue; + if (device->block) + dasd_profile_off(&device->block->profile); + dasd_put_device(device); + } +} + +static void dasd_stats_all_block_reset(void) +{ + int i; + struct dasd_device *device; + + for (i = 0; i < dasd_max_devindex; ++i) { + device = dasd_device_from_devindex(i); + if (IS_ERR(device)) + continue; + if (device->block) + dasd_profile_reset(&device->block->profile); + dasd_put_device(device); + } +} + +static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor) +{ + int i; + + for (i = 0; i < 32; i++) { + seq_printf(m, "%7d ", array[i] / factor); + if (i == 15) + seq_putc(m, '\n'); + } + seq_putc(m, '\n'); +} +#endif /* CONFIG_DASD_PROFILE */ + +static int dasd_stats_proc_show(struct seq_file *m, void *v) +{ +#ifdef CONFIG_DASD_PROFILE + struct dasd_profile_info *prof; + int factor; + + spin_lock_bh(&dasd_global_profile.lock); + prof = dasd_global_profile.data; + if (!prof) { + spin_unlock_bh(&dasd_global_profile.lock); + seq_printf(m, "Statistics are off - they might be " + "switched on using 'echo set on > " + "/proc/dasd/statistics'\n"); + return 0; + } + + /* prevent counter 'overflow' on output */ + for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; + factor *= 10); + + seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs); + seq_printf(m, "with %u sectors(512B each)\n", + prof->dasd_io_sects); + seq_printf(m, "Scale Factor is %d\n", factor); + seq_printf(m, + " __<4 ___8 __16 __32 __64 _128 " + " _256 _512 __1k __2k __4k __8k " + " _16k _32k _64k 128k\n"); + seq_printf(m, + " _256 _512 __1M __2M __4M __8M " + " _16M _32M _64M 128M 256M 512M " + " __1G __2G __4G " " _>4G\n"); + + seq_printf(m, "Histogram of sizes (512B secs)\n"); + dasd_statistics_array(m, prof->dasd_io_secs, factor); + seq_printf(m, "Histogram of I/O times (microseconds)\n"); + dasd_statistics_array(m, prof->dasd_io_times, factor); + seq_printf(m, "Histogram of I/O times per sector\n"); + dasd_statistics_array(m, prof->dasd_io_timps, factor); + seq_printf(m, "Histogram of I/O time till ssch\n"); + dasd_statistics_array(m, prof->dasd_io_time1, factor); + seq_printf(m, "Histogram of I/O time between ssch and irq\n"); + dasd_statistics_array(m, prof->dasd_io_time2, factor); + seq_printf(m, "Histogram of I/O time between ssch " + "and irq per sector\n"); + dasd_statistics_array(m, prof->dasd_io_time2ps, factor); + seq_printf(m, "Histogram of I/O time between irq and end\n"); + dasd_statistics_array(m, prof->dasd_io_time3, factor); + seq_printf(m, "# of req in chanq at enqueuing (1..32) \n"); + dasd_statistics_array(m, prof->dasd_io_nr_req, factor); + spin_unlock_bh(&dasd_global_profile.lock); +#else + seq_printf(m, "Statistics are not activated in this kernel\n"); +#endif + return 0; +} + +static int dasd_stats_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, dasd_stats_proc_show, NULL); +} + +static ssize_t dasd_stats_proc_write(struct file *file, + const char __user *user_buf, size_t user_len, loff_t *pos) +{ +#ifdef CONFIG_DASD_PROFILE + char *buffer, *str; + int rc; + + if (user_len > 65536) + user_len = 65536; + buffer = dasd_get_user_string(user_buf, user_len); + if (IS_ERR(buffer)) + return PTR_ERR(buffer); + + /* check for valid verbs */ + str = skip_spaces(buffer); + if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { + /* 'set xxx' was given */ + str = skip_spaces(str + 4); + if (strcmp(str, "on") == 0) { + /* switch on statistics profiling */ + rc = dasd_stats_all_block_on(); + if (rc) { + dasd_stats_all_block_off(); + goto out_error; + } + rc = dasd_profile_on(&dasd_global_profile); + if (rc) { + dasd_stats_all_block_off(); + goto out_error; + } + dasd_profile_reset(&dasd_global_profile); + dasd_global_profile_level = DASD_PROFILE_ON; + pr_info("The statistics feature has been switched " + "on\n"); + } else if (strcmp(str, "off") == 0) { + /* switch off statistics profiling */ + dasd_global_profile_level = DASD_PROFILE_OFF; + dasd_profile_off(&dasd_global_profile); + dasd_stats_all_block_off(); + pr_info("The statistics feature has been switched " + "off\n"); + } else + goto out_parse_error; + } else if (strncmp(str, "reset", 5) == 0) { + /* reset the statistics */ + dasd_profile_reset(&dasd_global_profile); + dasd_stats_all_block_reset(); + pr_info("The statistics have been reset\n"); + } else + goto out_parse_error; + vfree(buffer); + return user_len; +out_parse_error: + rc = -EINVAL; + pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str); +out_error: + vfree(buffer); + return rc; +#else + pr_warn("/proc/dasd/statistics: is not activated in this kernel\n"); + return user_len; +#endif /* CONFIG_DASD_PROFILE */ +} + +static const struct file_operations dasd_stats_proc_fops = { + .owner = THIS_MODULE, + .open = dasd_stats_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .write = dasd_stats_proc_write, +}; + +/* + * Create dasd proc-fs entries. + * In case creation failed, cleanup and return -ENOENT. + */ +int +dasd_proc_init(void) +{ + dasd_proc_root_entry = proc_mkdir("dasd", NULL); + if (!dasd_proc_root_entry) + goto out_nodasd; + dasd_devices_entry = proc_create_seq("devices", + S_IFREG | S_IRUGO | S_IWUSR, + dasd_proc_root_entry, + &dasd_devices_seq_ops); + if (!dasd_devices_entry) + goto out_nodevices; + dasd_statistics_entry = proc_create("statistics", + S_IFREG | S_IRUGO | S_IWUSR, + dasd_proc_root_entry, + &dasd_stats_proc_fops); + if (!dasd_statistics_entry) + goto out_nostatistics; + return 0; + + out_nostatistics: + remove_proc_entry("devices", dasd_proc_root_entry); + out_nodevices: + remove_proc_entry("dasd", NULL); + out_nodasd: + return -ENOENT; +} + +void +dasd_proc_exit(void) +{ + remove_proc_entry("devices", dasd_proc_root_entry); + remove_proc_entry("statistics", dasd_proc_root_entry); + remove_proc_entry("dasd", NULL); +} diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c new file mode 100644 index 000000000..4e8aedd50 --- /dev/null +++ b/drivers/s390/block/dcssblk.c @@ -0,0 +1,1136 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * dcssblk.c -- the S/390 block driver for dcss memory + * + * Authors: Carsten Otte, Stefan Weinhuber, Gerald Schaefer + */ + +#define KMSG_COMPONENT "dcssblk" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DCSSBLK_NAME "dcssblk" +#define DCSSBLK_MINORS_PER_DISK 1 +#define DCSSBLK_PARM_LEN 400 +#define DCSS_BUS_ID_SIZE 20 + +static int dcssblk_open(struct block_device *bdev, fmode_t mode); +static void dcssblk_release(struct gendisk *disk, fmode_t mode); +static blk_qc_t dcssblk_make_request(struct request_queue *q, + struct bio *bio); +static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, + long nr_pages, void **kaddr, pfn_t *pfn); + +static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0"; + +static int dcssblk_major; +static const struct block_device_operations dcssblk_devops = { + .owner = THIS_MODULE, + .open = dcssblk_open, + .release = dcssblk_release, +}; + +static size_t dcssblk_dax_copy_from_iter(struct dax_device *dax_dev, + pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) +{ + return copy_from_iter(addr, bytes, i); +} + +static size_t dcssblk_dax_copy_to_iter(struct dax_device *dax_dev, + pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) +{ + return copy_to_iter(addr, bytes, i); +} + +static const struct dax_operations dcssblk_dax_ops = { + .direct_access = dcssblk_dax_direct_access, + .copy_from_iter = dcssblk_dax_copy_from_iter, + .copy_to_iter = dcssblk_dax_copy_to_iter, +}; + +struct dcssblk_dev_info { + struct list_head lh; + struct device dev; + char segment_name[DCSS_BUS_ID_SIZE]; + atomic_t use_count; + struct gendisk *gd; + unsigned long start; + unsigned long end; + int segment_type; + unsigned char save_pending; + unsigned char is_shared; + struct request_queue *dcssblk_queue; + int num_of_segments; + struct list_head seg_list; + struct dax_device *dax_dev; +}; + +struct segment_info { + struct list_head lh; + char segment_name[DCSS_BUS_ID_SIZE]; + unsigned long start; + unsigned long end; + int segment_type; +}; + +static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf, + size_t count); +static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf, + size_t count); + +static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); +static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); + +static struct device *dcssblk_root_dev; + +static LIST_HEAD(dcssblk_devices); +static struct rw_semaphore dcssblk_devices_sem; + +/* + * release function for segment device. + */ +static void +dcssblk_release_segment(struct device *dev) +{ + struct dcssblk_dev_info *dev_info; + struct segment_info *entry, *temp; + + dev_info = container_of(dev, struct dcssblk_dev_info, dev); + list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { + list_del(&entry->lh); + kfree(entry); + } + kfree(dev_info); + module_put(THIS_MODULE); +} + +/* + * get a minor number. needs to be called with + * down_write(&dcssblk_devices_sem) and the + * device needs to be enqueued before the semaphore is + * freed. + */ +static int +dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) +{ + int minor, found; + struct dcssblk_dev_info *entry; + + if (dev_info == NULL) + return -EINVAL; + for (minor = 0; minor < (1<gd->first_minor) + found++; + if (!found) break; // got unused minor + } + if (found) + return -EBUSY; + dev_info->gd->first_minor = minor; + return 0; +} + +/* + * get the struct dcssblk_dev_info from dcssblk_devices + * for the given name. + * down_read(&dcssblk_devices_sem) must be held. + */ +static struct dcssblk_dev_info * +dcssblk_get_device_by_name(char *name) +{ + struct dcssblk_dev_info *entry; + + list_for_each_entry(entry, &dcssblk_devices, lh) { + if (!strcmp(name, entry->segment_name)) { + return entry; + } + } + return NULL; +} + +/* + * get the struct segment_info from seg_list + * for the given name. + * down_read(&dcssblk_devices_sem) must be held. + */ +static struct segment_info * +dcssblk_get_segment_by_name(char *name) +{ + struct dcssblk_dev_info *dev_info; + struct segment_info *entry; + + list_for_each_entry(dev_info, &dcssblk_devices, lh) { + list_for_each_entry(entry, &dev_info->seg_list, lh) { + if (!strcmp(name, entry->segment_name)) + return entry; + } + } + return NULL; +} + +/* + * get the highest address of the multi-segment block. + */ +static unsigned long +dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) +{ + unsigned long highest_addr; + struct segment_info *entry; + + highest_addr = 0; + list_for_each_entry(entry, &dev_info->seg_list, lh) { + if (highest_addr < entry->end) + highest_addr = entry->end; + } + return highest_addr; +} + +/* + * get the lowest address of the multi-segment block. + */ +static unsigned long +dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) +{ + int set_first; + unsigned long lowest_addr; + struct segment_info *entry; + + set_first = 0; + lowest_addr = 0; + list_for_each_entry(entry, &dev_info->seg_list, lh) { + if (set_first == 0) { + lowest_addr = entry->start; + set_first = 1; + } else { + if (lowest_addr > entry->start) + lowest_addr = entry->start; + } + } + return lowest_addr; +} + +/* + * Check continuity of segments. + */ +static int +dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) +{ + int i, j, rc; + struct segment_info *sort_list, *entry, temp; + + if (dev_info->num_of_segments <= 1) + return 0; + + sort_list = kcalloc(dev_info->num_of_segments, + sizeof(struct segment_info), + GFP_KERNEL); + if (sort_list == NULL) + return -ENOMEM; + i = 0; + list_for_each_entry(entry, &dev_info->seg_list, lh) { + memcpy(&sort_list[i], entry, sizeof(struct segment_info)); + i++; + } + + /* sort segments */ + for (i = 0; i < dev_info->num_of_segments; i++) + for (j = 0; j < dev_info->num_of_segments; j++) + if (sort_list[j].start > sort_list[i].start) { + memcpy(&temp, &sort_list[i], + sizeof(struct segment_info)); + memcpy(&sort_list[i], &sort_list[j], + sizeof(struct segment_info)); + memcpy(&sort_list[j], &temp, + sizeof(struct segment_info)); + } + + /* check continuity */ + for (i = 0; i < dev_info->num_of_segments - 1; i++) { + if ((sort_list[i].end + 1) != sort_list[i+1].start) { + pr_err("Adjacent DCSSs %s and %s are not " + "contiguous\n", sort_list[i].segment_name, + sort_list[i+1].segment_name); + rc = -EINVAL; + goto out; + } + /* EN and EW are allowed in a block device */ + if (sort_list[i].segment_type != sort_list[i+1].segment_type) { + if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || + (sort_list[i].segment_type == SEG_TYPE_ER) || + !(sort_list[i+1].segment_type & + SEGMENT_EXCLUSIVE) || + (sort_list[i+1].segment_type == SEG_TYPE_ER)) { + pr_err("DCSS %s and DCSS %s have " + "incompatible types\n", + sort_list[i].segment_name, + sort_list[i+1].segment_name); + rc = -EINVAL; + goto out; + } + } + } + rc = 0; +out: + kfree(sort_list); + return rc; +} + +/* + * Load a segment + */ +static int +dcssblk_load_segment(char *name, struct segment_info **seg_info) +{ + int rc; + + /* already loaded? */ + down_read(&dcssblk_devices_sem); + *seg_info = dcssblk_get_segment_by_name(name); + up_read(&dcssblk_devices_sem); + if (*seg_info != NULL) + return -EEXIST; + + /* get a struct segment_info */ + *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); + if (*seg_info == NULL) + return -ENOMEM; + + strcpy((*seg_info)->segment_name, name); + + /* load the segment */ + rc = segment_load(name, SEGMENT_SHARED, + &(*seg_info)->start, &(*seg_info)->end); + if (rc < 0) { + segment_warning(rc, (*seg_info)->segment_name); + kfree(*seg_info); + } else { + INIT_LIST_HEAD(&(*seg_info)->lh); + (*seg_info)->segment_type = rc; + } + return rc; +} + +/* + * device attribute for switching shared/nonshared (exclusive) + * operation (show + store) + */ +static ssize_t +dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dcssblk_dev_info *dev_info; + + dev_info = container_of(dev, struct dcssblk_dev_info, dev); + return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n"); +} + +static ssize_t +dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) +{ + struct dcssblk_dev_info *dev_info; + struct segment_info *entry, *temp; + int rc; + + if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) + return -EINVAL; + down_write(&dcssblk_devices_sem); + dev_info = container_of(dev, struct dcssblk_dev_info, dev); + if (atomic_read(&dev_info->use_count)) { + rc = -EBUSY; + goto out; + } + if (inbuf[0] == '1') { + /* reload segments in shared mode */ + list_for_each_entry(entry, &dev_info->seg_list, lh) { + rc = segment_modify_shared(entry->segment_name, + SEGMENT_SHARED); + if (rc < 0) { + BUG_ON(rc == -EINVAL); + if (rc != -EAGAIN) + goto removeseg; + } + } + dev_info->is_shared = 1; + switch (dev_info->segment_type) { + case SEG_TYPE_SR: + case SEG_TYPE_ER: + case SEG_TYPE_SC: + set_disk_ro(dev_info->gd, 1); + } + } else if (inbuf[0] == '0') { + /* reload segments in exclusive mode */ + if (dev_info->segment_type == SEG_TYPE_SC) { + pr_err("DCSS %s is of type SC and cannot be " + "loaded as exclusive-writable\n", + dev_info->segment_name); + rc = -EINVAL; + goto out; + } + list_for_each_entry(entry, &dev_info->seg_list, lh) { + rc = segment_modify_shared(entry->segment_name, + SEGMENT_EXCLUSIVE); + if (rc < 0) { + BUG_ON(rc == -EINVAL); + if (rc != -EAGAIN) + goto removeseg; + } + } + dev_info->is_shared = 0; + set_disk_ro(dev_info->gd, 0); + } else { + rc = -EINVAL; + goto out; + } + rc = count; + goto out; + +removeseg: + pr_err("DCSS device %s is removed after a failed access mode " + "change\n", dev_info->segment_name); + temp = entry; + list_for_each_entry(entry, &dev_info->seg_list, lh) { + if (entry != temp) + segment_unload(entry->segment_name); + } + list_del(&dev_info->lh); + + kill_dax(dev_info->dax_dev); + put_dax(dev_info->dax_dev); + del_gendisk(dev_info->gd); + blk_cleanup_queue(dev_info->dcssblk_queue); + dev_info->gd->queue = NULL; + put_disk(dev_info->gd); + up_write(&dcssblk_devices_sem); + + if (device_remove_file_self(dev, attr)) { + device_unregister(dev); + put_device(dev); + } + return rc; +out: + up_write(&dcssblk_devices_sem); + return rc; +} +static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, + dcssblk_shared_store); + +/* + * device attribute for save operation on current copy + * of the segment. If the segment is busy, saving will + * become pending until it gets released, which can be + * undone by storing a non-true value to this entry. + * (show + store) + */ +static ssize_t +dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dcssblk_dev_info *dev_info; + + dev_info = container_of(dev, struct dcssblk_dev_info, dev); + return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n"); +} + +static ssize_t +dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) +{ + struct dcssblk_dev_info *dev_info; + struct segment_info *entry; + + if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) + return -EINVAL; + dev_info = container_of(dev, struct dcssblk_dev_info, dev); + + down_write(&dcssblk_devices_sem); + if (inbuf[0] == '1') { + if (atomic_read(&dev_info->use_count) == 0) { + // device is idle => we save immediately + pr_info("All DCSSs that map to device %s are " + "saved\n", dev_info->segment_name); + list_for_each_entry(entry, &dev_info->seg_list, lh) { + if (entry->segment_type == SEG_TYPE_EN || + entry->segment_type == SEG_TYPE_SN) + pr_warn("DCSS %s is of type SN or EN" + " and cannot be saved\n", + entry->segment_name); + else + segment_save(entry->segment_name); + } + } else { + // device is busy => we save it when it becomes + // idle in dcssblk_release + pr_info("Device %s is in use, its DCSSs will be " + "saved when it becomes idle\n", + dev_info->segment_name); + dev_info->save_pending = 1; + } + } else if (inbuf[0] == '0') { + if (dev_info->save_pending) { + // device is busy & the user wants to undo his save + // request + dev_info->save_pending = 0; + pr_info("A pending save request for device %s " + "has been canceled\n", + dev_info->segment_name); + } + } else { + up_write(&dcssblk_devices_sem); + return -EINVAL; + } + up_write(&dcssblk_devices_sem); + return count; +} +static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, + dcssblk_save_store); + +/* + * device attribute for showing all segments in a device + */ +static ssize_t +dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int i; + + struct dcssblk_dev_info *dev_info; + struct segment_info *entry; + + down_read(&dcssblk_devices_sem); + dev_info = container_of(dev, struct dcssblk_dev_info, dev); + i = 0; + buf[0] = '\0'; + list_for_each_entry(entry, &dev_info->seg_list, lh) { + strcpy(&buf[i], entry->segment_name); + i += strlen(entry->segment_name); + buf[i] = '\n'; + i++; + } + up_read(&dcssblk_devices_sem); + return i; +} +static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); + +static struct attribute *dcssblk_dev_attrs[] = { + &dev_attr_shared.attr, + &dev_attr_save.attr, + &dev_attr_seglist.attr, + NULL, +}; +static struct attribute_group dcssblk_dev_attr_group = { + .attrs = dcssblk_dev_attrs, +}; +static const struct attribute_group *dcssblk_dev_attr_groups[] = { + &dcssblk_dev_attr_group, + NULL, +}; + +/* + * device attribute for adding devices + */ +static ssize_t +dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + int rc, i, j, num_of_segments; + struct dcssblk_dev_info *dev_info; + struct segment_info *seg_info, *temp; + char *local_buf; + unsigned long seg_byte_size; + + dev_info = NULL; + seg_info = NULL; + if (dev != dcssblk_root_dev) { + rc = -EINVAL; + goto out_nobuf; + } + if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { + rc = -ENAMETOOLONG; + goto out_nobuf; + } + + local_buf = kmalloc(count + 1, GFP_KERNEL); + if (local_buf == NULL) { + rc = -ENOMEM; + goto out_nobuf; + } + + /* + * parse input + */ + num_of_segments = 0; + for (i = 0; (i < count && (buf[i] != '\0') && (buf[i] != '\n')); i++) { + for (j = i; j < count && + (buf[j] != ':') && + (buf[j] != '\0') && + (buf[j] != '\n'); j++) { + local_buf[j-i] = toupper(buf[j]); + } + local_buf[j-i] = '\0'; + if (((j - i) == 0) || ((j - i) > 8)) { + rc = -ENAMETOOLONG; + goto seg_list_del; + } + + rc = dcssblk_load_segment(local_buf, &seg_info); + if (rc < 0) + goto seg_list_del; + /* + * get a struct dcssblk_dev_info + */ + if (num_of_segments == 0) { + dev_info = kzalloc(sizeof(struct dcssblk_dev_info), + GFP_KERNEL); + if (dev_info == NULL) { + rc = -ENOMEM; + goto out; + } + strcpy(dev_info->segment_name, local_buf); + dev_info->segment_type = seg_info->segment_type; + INIT_LIST_HEAD(&dev_info->seg_list); + } + list_add_tail(&seg_info->lh, &dev_info->seg_list); + num_of_segments++; + i = j; + + if ((buf[j] == '\0') || (buf[j] == '\n')) + break; + } + + /* no trailing colon at the end of the input */ + if ((i > 0) && (buf[i-1] == ':')) { + rc = -ENAMETOOLONG; + goto seg_list_del; + } + strlcpy(local_buf, buf, i + 1); + dev_info->num_of_segments = num_of_segments; + rc = dcssblk_is_continuous(dev_info); + if (rc < 0) + goto seg_list_del; + + dev_info->start = dcssblk_find_lowest_addr(dev_info); + dev_info->end = dcssblk_find_highest_addr(dev_info); + + dev_set_name(&dev_info->dev, "%s", dev_info->segment_name); + dev_info->dev.release = dcssblk_release_segment; + dev_info->dev.groups = dcssblk_dev_attr_groups; + INIT_LIST_HEAD(&dev_info->lh); + dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); + if (dev_info->gd == NULL) { + rc = -ENOMEM; + goto seg_list_del; + } + dev_info->gd->major = dcssblk_major; + dev_info->gd->fops = &dcssblk_devops; + dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL); + dev_info->gd->queue = dev_info->dcssblk_queue; + dev_info->gd->private_data = dev_info; + blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); + blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096); + blk_queue_flag_set(QUEUE_FLAG_DAX, dev_info->dcssblk_queue); + + seg_byte_size = (dev_info->end - dev_info->start + 1); + set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors + pr_info("Loaded %s with total size %lu bytes and capacity %lu " + "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); + + dev_info->save_pending = 0; + dev_info->is_shared = 1; + dev_info->dev.parent = dcssblk_root_dev; + + /* + *get minor, add to list + */ + down_write(&dcssblk_devices_sem); + if (dcssblk_get_segment_by_name(local_buf)) { + rc = -EEXIST; + goto release_gd; + } + rc = dcssblk_assign_free_minor(dev_info); + if (rc) + goto release_gd; + sprintf(dev_info->gd->disk_name, "dcssblk%d", + dev_info->gd->first_minor); + list_add_tail(&dev_info->lh, &dcssblk_devices); + + if (!try_module_get(THIS_MODULE)) { + rc = -ENODEV; + goto dev_list_del; + } + /* + * register the device + */ + rc = device_register(&dev_info->dev); + if (rc) + goto put_dev; + + dev_info->dax_dev = alloc_dax(dev_info, dev_info->gd->disk_name, + &dcssblk_dax_ops); + if (!dev_info->dax_dev) { + rc = -ENOMEM; + goto put_dev; + } + + get_device(&dev_info->dev); + device_add_disk(&dev_info->dev, dev_info->gd, NULL); + + switch (dev_info->segment_type) { + case SEG_TYPE_SR: + case SEG_TYPE_ER: + case SEG_TYPE_SC: + set_disk_ro(dev_info->gd,1); + break; + default: + set_disk_ro(dev_info->gd,0); + break; + } + up_write(&dcssblk_devices_sem); + rc = count; + goto out; + +put_dev: + list_del(&dev_info->lh); + blk_cleanup_queue(dev_info->dcssblk_queue); + dev_info->gd->queue = NULL; + put_disk(dev_info->gd); + list_for_each_entry(seg_info, &dev_info->seg_list, lh) { + segment_unload(seg_info->segment_name); + } + put_device(&dev_info->dev); + up_write(&dcssblk_devices_sem); + goto out; +dev_list_del: + list_del(&dev_info->lh); +release_gd: + blk_cleanup_queue(dev_info->dcssblk_queue); + dev_info->gd->queue = NULL; + put_disk(dev_info->gd); + up_write(&dcssblk_devices_sem); +seg_list_del: + if (dev_info == NULL) + goto out; + list_for_each_entry_safe(seg_info, temp, &dev_info->seg_list, lh) { + list_del(&seg_info->lh); + segment_unload(seg_info->segment_name); + kfree(seg_info); + } + kfree(dev_info); +out: + kfree(local_buf); +out_nobuf: + return rc; +} + +/* + * device attribute for removing devices + */ +static ssize_t +dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + struct dcssblk_dev_info *dev_info; + struct segment_info *entry; + int rc, i; + char *local_buf; + + if (dev != dcssblk_root_dev) { + return -EINVAL; + } + local_buf = kmalloc(count + 1, GFP_KERNEL); + if (local_buf == NULL) { + return -ENOMEM; + } + /* + * parse input + */ + for (i = 0; (i < count && (*(buf+i)!='\0') && (*(buf+i)!='\n')); i++) { + local_buf[i] = toupper(buf[i]); + } + local_buf[i] = '\0'; + if ((i == 0) || (i > 8)) { + rc = -ENAMETOOLONG; + goto out_buf; + } + + down_write(&dcssblk_devices_sem); + dev_info = dcssblk_get_device_by_name(local_buf); + if (dev_info == NULL) { + up_write(&dcssblk_devices_sem); + pr_warn("Device %s cannot be removed because it is not a known device\n", + local_buf); + rc = -ENODEV; + goto out_buf; + } + if (atomic_read(&dev_info->use_count) != 0) { + up_write(&dcssblk_devices_sem); + pr_warn("Device %s cannot be removed while it is in use\n", + local_buf); + rc = -EBUSY; + goto out_buf; + } + + list_del(&dev_info->lh); + kill_dax(dev_info->dax_dev); + put_dax(dev_info->dax_dev); + del_gendisk(dev_info->gd); + blk_cleanup_queue(dev_info->dcssblk_queue); + dev_info->gd->queue = NULL; + put_disk(dev_info->gd); + + /* unload all related segments */ + list_for_each_entry(entry, &dev_info->seg_list, lh) + segment_unload(entry->segment_name); + + up_write(&dcssblk_devices_sem); + + device_unregister(&dev_info->dev); + put_device(&dev_info->dev); + + rc = count; +out_buf: + kfree(local_buf); + return rc; +} + +static int +dcssblk_open(struct block_device *bdev, fmode_t mode) +{ + struct dcssblk_dev_info *dev_info; + int rc; + + dev_info = bdev->bd_disk->private_data; + if (NULL == dev_info) { + rc = -ENODEV; + goto out; + } + atomic_inc(&dev_info->use_count); + bdev->bd_block_size = 4096; + rc = 0; +out: + return rc; +} + +static void +dcssblk_release(struct gendisk *disk, fmode_t mode) +{ + struct dcssblk_dev_info *dev_info = disk->private_data; + struct segment_info *entry; + + if (!dev_info) { + WARN_ON(1); + return; + } + down_write(&dcssblk_devices_sem); + if (atomic_dec_and_test(&dev_info->use_count) + && (dev_info->save_pending)) { + pr_info("Device %s has become idle and is being saved " + "now\n", dev_info->segment_name); + list_for_each_entry(entry, &dev_info->seg_list, lh) { + if (entry->segment_type == SEG_TYPE_EN || + entry->segment_type == SEG_TYPE_SN) + pr_warn("DCSS %s is of type SN or EN and cannot" + " be saved\n", entry->segment_name); + else + segment_save(entry->segment_name); + } + dev_info->save_pending = 0; + } + up_write(&dcssblk_devices_sem); +} + +static blk_qc_t +dcssblk_make_request(struct request_queue *q, struct bio *bio) +{ + struct dcssblk_dev_info *dev_info; + struct bio_vec bvec; + struct bvec_iter iter; + unsigned long index; + unsigned long page_addr; + unsigned long source_addr; + unsigned long bytes_done; + + blk_queue_split(q, &bio); + + bytes_done = 0; + dev_info = bio->bi_disk->private_data; + if (dev_info == NULL) + goto fail; + if ((bio->bi_iter.bi_sector & 7) != 0 || + (bio->bi_iter.bi_size & 4095) != 0) + /* Request is not page-aligned. */ + goto fail; + if (bio_end_sector(bio) > get_capacity(bio->bi_disk)) { + /* Request beyond end of DCSS segment. */ + goto fail; + } + /* verify data transfer direction */ + if (dev_info->is_shared) { + switch (dev_info->segment_type) { + case SEG_TYPE_SR: + case SEG_TYPE_ER: + case SEG_TYPE_SC: + /* cannot write to these segments */ + if (bio_data_dir(bio) == WRITE) { + pr_warn("Writing to %s failed because it is a read-only device\n", + dev_name(&dev_info->dev)); + goto fail; + } + } + } + + index = (bio->bi_iter.bi_sector >> 3); + bio_for_each_segment(bvec, bio, iter) { + page_addr = (unsigned long) + page_address(bvec.bv_page) + bvec.bv_offset; + source_addr = dev_info->start + (index<<12) + bytes_done; + if (unlikely((page_addr & 4095) != 0) || (bvec.bv_len & 4095) != 0) + // More paranoia. + goto fail; + if (bio_data_dir(bio) == READ) { + memcpy((void*)page_addr, (void*)source_addr, + bvec.bv_len); + } else { + memcpy((void*)source_addr, (void*)page_addr, + bvec.bv_len); + } + bytes_done += bvec.bv_len; + } + bio_endio(bio); + return BLK_QC_T_NONE; +fail: + bio_io_error(bio); + return BLK_QC_T_NONE; +} + +static long +__dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff, + long nr_pages, void **kaddr, pfn_t *pfn) +{ + resource_size_t offset = pgoff * PAGE_SIZE; + unsigned long dev_sz; + + dev_sz = dev_info->end - dev_info->start + 1; + if (kaddr) + *kaddr = (void *) dev_info->start + offset; + if (pfn) + *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), + PFN_DEV|PFN_SPECIAL); + + return (dev_sz - offset) / PAGE_SIZE; +} + +static long +dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, + long nr_pages, void **kaddr, pfn_t *pfn) +{ + struct dcssblk_dev_info *dev_info = dax_get_private(dax_dev); + + return __dcssblk_direct_access(dev_info, pgoff, nr_pages, kaddr, pfn); +} + +static void +dcssblk_check_params(void) +{ + int rc, i, j, k; + char buf[DCSSBLK_PARM_LEN + 1]; + struct dcssblk_dev_info *dev_info; + + for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); + i++) { + for (j = i; (j < DCSSBLK_PARM_LEN) && + (dcssblk_segments[j] != ',') && + (dcssblk_segments[j] != '\0') && + (dcssblk_segments[j] != '('); j++) + { + buf[j-i] = dcssblk_segments[j]; + } + buf[j-i] = '\0'; + rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); + if ((rc >= 0) && (dcssblk_segments[j] == '(')) { + for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++) + buf[k] = toupper(buf[k]); + buf[k] = '\0'; + if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { + down_read(&dcssblk_devices_sem); + dev_info = dcssblk_get_device_by_name(buf); + up_read(&dcssblk_devices_sem); + if (dev_info) + dcssblk_shared_store(&dev_info->dev, + NULL, "0\n", 2); + } + } + while ((dcssblk_segments[j] != ',') && + (dcssblk_segments[j] != '\0')) + { + j++; + } + if (dcssblk_segments[j] == '\0') + break; + i = j; + } +} + +/* + * Suspend / Resume + */ +static int dcssblk_freeze(struct device *dev) +{ + struct dcssblk_dev_info *dev_info; + int rc = 0; + + list_for_each_entry(dev_info, &dcssblk_devices, lh) { + switch (dev_info->segment_type) { + case SEG_TYPE_SR: + case SEG_TYPE_ER: + case SEG_TYPE_SC: + if (!dev_info->is_shared) + rc = -EINVAL; + break; + default: + rc = -EINVAL; + break; + } + if (rc) + break; + } + if (rc) + pr_err("Suspending the system failed because DCSS device %s " + "is writable\n", + dev_info->segment_name); + return rc; +} + +static int dcssblk_restore(struct device *dev) +{ + struct dcssblk_dev_info *dev_info; + struct segment_info *entry; + unsigned long start, end; + int rc = 0; + + list_for_each_entry(dev_info, &dcssblk_devices, lh) { + list_for_each_entry(entry, &dev_info->seg_list, lh) { + segment_unload(entry->segment_name); + rc = segment_load(entry->segment_name, SEGMENT_SHARED, + &start, &end); + if (rc < 0) { +// TODO in_use check ? + segment_warning(rc, entry->segment_name); + goto out_panic; + } + if (start != entry->start || end != entry->end) { + pr_err("The address range of DCSS %s changed " + "while the system was suspended\n", + entry->segment_name); + goto out_panic; + } + } + } + return 0; +out_panic: + panic("fatal dcssblk resume error\n"); +} + +static int dcssblk_thaw(struct device *dev) +{ + return 0; +} + +static const struct dev_pm_ops dcssblk_pm_ops = { + .freeze = dcssblk_freeze, + .thaw = dcssblk_thaw, + .restore = dcssblk_restore, +}; + +static struct platform_driver dcssblk_pdrv = { + .driver = { + .name = "dcssblk", + .pm = &dcssblk_pm_ops, + }, +}; + +static struct platform_device *dcssblk_pdev; + + +/* + * The init/exit functions. + */ +static void __exit +dcssblk_exit(void) +{ + platform_device_unregister(dcssblk_pdev); + platform_driver_unregister(&dcssblk_pdrv); + root_device_unregister(dcssblk_root_dev); + unregister_blkdev(dcssblk_major, DCSSBLK_NAME); +} + +static int __init +dcssblk_init(void) +{ + int rc; + + rc = platform_driver_register(&dcssblk_pdrv); + if (rc) + return rc; + + dcssblk_pdev = platform_device_register_simple("dcssblk", -1, NULL, + 0); + if (IS_ERR(dcssblk_pdev)) { + rc = PTR_ERR(dcssblk_pdev); + goto out_pdrv; + } + + dcssblk_root_dev = root_device_register("dcssblk"); + if (IS_ERR(dcssblk_root_dev)) { + rc = PTR_ERR(dcssblk_root_dev); + goto out_pdev; + } + rc = device_create_file(dcssblk_root_dev, &dev_attr_add); + if (rc) + goto out_root; + rc = device_create_file(dcssblk_root_dev, &dev_attr_remove); + if (rc) + goto out_root; + rc = register_blkdev(0, DCSSBLK_NAME); + if (rc < 0) + goto out_root; + dcssblk_major = rc; + init_rwsem(&dcssblk_devices_sem); + + dcssblk_check_params(); + return 0; + +out_root: + root_device_unregister(dcssblk_root_dev); +out_pdev: + platform_device_unregister(dcssblk_pdev); +out_pdrv: + platform_driver_unregister(&dcssblk_pdrv); + return rc; +} + +module_init(dcssblk_init); +module_exit(dcssblk_exit); + +module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444); +MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, " + "comma-separated list, names in each set separated " + "by commas are separated by colons, each set contains " + "names of contiguous segments and each name max. 8 chars.\n" + "Adding \"(local)\" to the end of each set equals echoing 0 " + "to /sys/devices/dcssblk//shared after loading " + "the contiguous segments - \n" + "e.g. segments=\"mydcss1,mydcss2:mydcss3,mydcss4(local)\""); + +MODULE_LICENSE("GPL"); diff --git a/drivers/s390/block/scm_blk.c b/drivers/s390/block/scm_blk.c new file mode 100644 index 000000000..e01889394 --- /dev/null +++ b/drivers/s390/block/scm_blk.c @@ -0,0 +1,591 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Block driver for s390 storage class memory. + * + * Copyright IBM Corp. 2012 + * Author(s): Sebastian Ott + */ + +#define KMSG_COMPONENT "scm_block" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "scm_blk.h" + +debug_info_t *scm_debug; +static int scm_major; +static mempool_t *aidaw_pool; +static DEFINE_SPINLOCK(list_lock); +static LIST_HEAD(inactive_requests); +static unsigned int nr_requests = 64; +static unsigned int nr_requests_per_io = 8; +static atomic_t nr_devices = ATOMIC_INIT(0); +module_param(nr_requests, uint, S_IRUGO); +MODULE_PARM_DESC(nr_requests, "Number of parallel requests."); + +module_param(nr_requests_per_io, uint, S_IRUGO); +MODULE_PARM_DESC(nr_requests_per_io, "Number of requests per IO."); + +MODULE_DESCRIPTION("Block driver for s390 storage class memory."); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("scm:scmdev*"); + +static void __scm_free_rq(struct scm_request *scmrq) +{ + struct aob_rq_header *aobrq = to_aobrq(scmrq); + + free_page((unsigned long) scmrq->aob); + kfree(scmrq->request); + kfree(aobrq); +} + +static void scm_free_rqs(void) +{ + struct list_head *iter, *safe; + struct scm_request *scmrq; + + spin_lock_irq(&list_lock); + list_for_each_safe(iter, safe, &inactive_requests) { + scmrq = list_entry(iter, struct scm_request, list); + list_del(&scmrq->list); + __scm_free_rq(scmrq); + } + spin_unlock_irq(&list_lock); + + mempool_destroy(aidaw_pool); +} + +static int __scm_alloc_rq(void) +{ + struct aob_rq_header *aobrq; + struct scm_request *scmrq; + + aobrq = kzalloc(sizeof(*aobrq) + sizeof(*scmrq), GFP_KERNEL); + if (!aobrq) + return -ENOMEM; + + scmrq = (void *) aobrq->data; + scmrq->aob = (void *) get_zeroed_page(GFP_DMA); + if (!scmrq->aob) + goto free; + + scmrq->request = kcalloc(nr_requests_per_io, sizeof(scmrq->request[0]), + GFP_KERNEL); + if (!scmrq->request) + goto free; + + INIT_LIST_HEAD(&scmrq->list); + spin_lock_irq(&list_lock); + list_add(&scmrq->list, &inactive_requests); + spin_unlock_irq(&list_lock); + + return 0; +free: + __scm_free_rq(scmrq); + return -ENOMEM; +} + +static int scm_alloc_rqs(unsigned int nrqs) +{ + int ret = 0; + + aidaw_pool = mempool_create_page_pool(max(nrqs/8, 1U), 0); + if (!aidaw_pool) + return -ENOMEM; + + while (nrqs-- && !ret) + ret = __scm_alloc_rq(); + + return ret; +} + +static struct scm_request *scm_request_fetch(void) +{ + struct scm_request *scmrq = NULL; + + spin_lock_irq(&list_lock); + if (list_empty(&inactive_requests)) + goto out; + scmrq = list_first_entry(&inactive_requests, struct scm_request, list); + list_del(&scmrq->list); +out: + spin_unlock_irq(&list_lock); + return scmrq; +} + +static void scm_request_done(struct scm_request *scmrq) +{ + unsigned long flags; + struct msb *msb; + u64 aidaw; + int i; + + for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++) { + msb = &scmrq->aob->msb[i]; + aidaw = msb->data_addr; + + if ((msb->flags & MSB_FLAG_IDA) && aidaw && + IS_ALIGNED(aidaw, PAGE_SIZE)) + mempool_free(virt_to_page(aidaw), aidaw_pool); + } + + spin_lock_irqsave(&list_lock, flags); + list_add(&scmrq->list, &inactive_requests); + spin_unlock_irqrestore(&list_lock, flags); +} + +static bool scm_permit_request(struct scm_blk_dev *bdev, struct request *req) +{ + return rq_data_dir(req) != WRITE || bdev->state != SCM_WR_PROHIBIT; +} + +static inline struct aidaw *scm_aidaw_alloc(void) +{ + struct page *page = mempool_alloc(aidaw_pool, GFP_ATOMIC); + + return page ? page_address(page) : NULL; +} + +static inline unsigned long scm_aidaw_bytes(struct aidaw *aidaw) +{ + unsigned long _aidaw = (unsigned long) aidaw; + unsigned long bytes = ALIGN(_aidaw, PAGE_SIZE) - _aidaw; + + return (bytes / sizeof(*aidaw)) * PAGE_SIZE; +} + +struct aidaw *scm_aidaw_fetch(struct scm_request *scmrq, unsigned int bytes) +{ + struct aidaw *aidaw; + + if (scm_aidaw_bytes(scmrq->next_aidaw) >= bytes) + return scmrq->next_aidaw; + + aidaw = scm_aidaw_alloc(); + if (aidaw) + memset(aidaw, 0, PAGE_SIZE); + return aidaw; +} + +static int scm_request_prepare(struct scm_request *scmrq) +{ + struct scm_blk_dev *bdev = scmrq->bdev; + struct scm_device *scmdev = bdev->gendisk->private_data; + int pos = scmrq->aob->request.msb_count; + struct msb *msb = &scmrq->aob->msb[pos]; + struct request *req = scmrq->request[pos]; + struct req_iterator iter; + struct aidaw *aidaw; + struct bio_vec bv; + + aidaw = scm_aidaw_fetch(scmrq, blk_rq_bytes(req)); + if (!aidaw) + return -ENOMEM; + + msb->bs = MSB_BS_4K; + scmrq->aob->request.msb_count++; + msb->scm_addr = scmdev->address + ((u64) blk_rq_pos(req) << 9); + msb->oc = (rq_data_dir(req) == READ) ? MSB_OC_READ : MSB_OC_WRITE; + msb->flags |= MSB_FLAG_IDA; + msb->data_addr = (u64) aidaw; + + rq_for_each_segment(bv, req, iter) { + WARN_ON(bv.bv_offset); + msb->blk_count += bv.bv_len >> 12; + aidaw->data_addr = (u64) page_address(bv.bv_page); + aidaw++; + } + + scmrq->next_aidaw = aidaw; + return 0; +} + +static inline void scm_request_set(struct scm_request *scmrq, + struct request *req) +{ + scmrq->request[scmrq->aob->request.msb_count] = req; +} + +static inline void scm_request_init(struct scm_blk_dev *bdev, + struct scm_request *scmrq) +{ + struct aob_rq_header *aobrq = to_aobrq(scmrq); + struct aob *aob = scmrq->aob; + + memset(scmrq->request, 0, + nr_requests_per_io * sizeof(scmrq->request[0])); + memset(aob, 0, sizeof(*aob)); + aobrq->scmdev = bdev->scmdev; + aob->request.cmd_code = ARQB_CMD_MOVE; + aob->request.data = (u64) aobrq; + scmrq->bdev = bdev; + scmrq->retries = 4; + scmrq->error = BLK_STS_OK; + /* We don't use all msbs - place aidaws at the end of the aob page. */ + scmrq->next_aidaw = (void *) &aob->msb[nr_requests_per_io]; +} + +static void scm_request_requeue(struct scm_request *scmrq) +{ + struct scm_blk_dev *bdev = scmrq->bdev; + int i; + + for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++) + blk_mq_requeue_request(scmrq->request[i], false); + + atomic_dec(&bdev->queued_reqs); + scm_request_done(scmrq); + blk_mq_kick_requeue_list(bdev->rq); +} + +static void scm_request_finish(struct scm_request *scmrq) +{ + struct scm_blk_dev *bdev = scmrq->bdev; + blk_status_t *error; + int i; + + for (i = 0; i < nr_requests_per_io && scmrq->request[i]; i++) { + error = blk_mq_rq_to_pdu(scmrq->request[i]); + *error = scmrq->error; + blk_mq_complete_request(scmrq->request[i]); + } + + atomic_dec(&bdev->queued_reqs); + scm_request_done(scmrq); +} + +static void scm_request_start(struct scm_request *scmrq) +{ + struct scm_blk_dev *bdev = scmrq->bdev; + + atomic_inc(&bdev->queued_reqs); + if (eadm_start_aob(scmrq->aob)) { + SCM_LOG(5, "no subchannel"); + scm_request_requeue(scmrq); + } +} + +struct scm_queue { + struct scm_request *scmrq; + spinlock_t lock; +}; + +static blk_status_t scm_blk_request(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *qd) +{ + struct scm_device *scmdev = hctx->queue->queuedata; + struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev); + struct scm_queue *sq = hctx->driver_data; + struct request *req = qd->rq; + struct scm_request *scmrq; + + spin_lock(&sq->lock); + if (!scm_permit_request(bdev, req)) { + spin_unlock(&sq->lock); + return BLK_STS_RESOURCE; + } + + scmrq = sq->scmrq; + if (!scmrq) { + scmrq = scm_request_fetch(); + if (!scmrq) { + SCM_LOG(5, "no request"); + spin_unlock(&sq->lock); + return BLK_STS_RESOURCE; + } + scm_request_init(bdev, scmrq); + sq->scmrq = scmrq; + } + scm_request_set(scmrq, req); + + if (scm_request_prepare(scmrq)) { + SCM_LOG(5, "aidaw alloc failed"); + scm_request_set(scmrq, NULL); + + if (scmrq->aob->request.msb_count) + scm_request_start(scmrq); + + sq->scmrq = NULL; + spin_unlock(&sq->lock); + return BLK_STS_RESOURCE; + } + blk_mq_start_request(req); + + if (qd->last || scmrq->aob->request.msb_count == nr_requests_per_io) { + scm_request_start(scmrq); + sq->scmrq = NULL; + } + spin_unlock(&sq->lock); + return BLK_STS_OK; +} + +static int scm_blk_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, + unsigned int idx) +{ + struct scm_queue *qd = kzalloc(sizeof(*qd), GFP_KERNEL); + + if (!qd) + return -ENOMEM; + + spin_lock_init(&qd->lock); + hctx->driver_data = qd; + + return 0; +} + +static void scm_blk_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int idx) +{ + struct scm_queue *qd = hctx->driver_data; + + WARN_ON(qd->scmrq); + kfree(hctx->driver_data); + hctx->driver_data = NULL; +} + +static void __scmrq_log_error(struct scm_request *scmrq) +{ + struct aob *aob = scmrq->aob; + + if (scmrq->error == BLK_STS_TIMEOUT) + SCM_LOG(1, "Request timeout"); + else { + SCM_LOG(1, "Request error"); + SCM_LOG_HEX(1, &aob->response, sizeof(aob->response)); + } + if (scmrq->retries) + SCM_LOG(1, "Retry request"); + else + pr_err("An I/O operation to SCM failed with rc=%d\n", + scmrq->error); +} + +static void scm_blk_handle_error(struct scm_request *scmrq) +{ + struct scm_blk_dev *bdev = scmrq->bdev; + unsigned long flags; + + if (scmrq->error != BLK_STS_IOERR) + goto restart; + + /* For -EIO the response block is valid. */ + switch (scmrq->aob->response.eqc) { + case EQC_WR_PROHIBIT: + spin_lock_irqsave(&bdev->lock, flags); + if (bdev->state != SCM_WR_PROHIBIT) + pr_info("%lx: Write access to the SCM increment is suspended\n", + (unsigned long) bdev->scmdev->address); + bdev->state = SCM_WR_PROHIBIT; + spin_unlock_irqrestore(&bdev->lock, flags); + goto requeue; + default: + break; + } + +restart: + if (!eadm_start_aob(scmrq->aob)) + return; + +requeue: + scm_request_requeue(scmrq); +} + +void scm_blk_irq(struct scm_device *scmdev, void *data, blk_status_t error) +{ + struct scm_request *scmrq = data; + + scmrq->error = error; + if (error) { + __scmrq_log_error(scmrq); + if (scmrq->retries-- > 0) { + scm_blk_handle_error(scmrq); + return; + } + } + + scm_request_finish(scmrq); +} + +static void scm_blk_request_done(struct request *req) +{ + blk_status_t *error = blk_mq_rq_to_pdu(req); + + blk_mq_end_request(req, *error); +} + +static const struct block_device_operations scm_blk_devops = { + .owner = THIS_MODULE, +}; + +static const struct blk_mq_ops scm_mq_ops = { + .queue_rq = scm_blk_request, + .complete = scm_blk_request_done, + .init_hctx = scm_blk_init_hctx, + .exit_hctx = scm_blk_exit_hctx, +}; + +int scm_blk_dev_setup(struct scm_blk_dev *bdev, struct scm_device *scmdev) +{ + unsigned int devindex, nr_max_blk; + struct request_queue *rq; + int len, ret; + + devindex = atomic_inc_return(&nr_devices) - 1; + /* scma..scmz + scmaa..scmzz */ + if (devindex > 701) { + ret = -ENODEV; + goto out; + } + + bdev->scmdev = scmdev; + bdev->state = SCM_OPER; + spin_lock_init(&bdev->lock); + atomic_set(&bdev->queued_reqs, 0); + + bdev->tag_set.ops = &scm_mq_ops; + bdev->tag_set.cmd_size = sizeof(blk_status_t); + bdev->tag_set.nr_hw_queues = nr_requests; + bdev->tag_set.queue_depth = nr_requests_per_io * nr_requests; + bdev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; + bdev->tag_set.numa_node = NUMA_NO_NODE; + + ret = blk_mq_alloc_tag_set(&bdev->tag_set); + if (ret) + goto out; + + rq = blk_mq_init_queue(&bdev->tag_set); + if (IS_ERR(rq)) { + ret = PTR_ERR(rq); + goto out_tag; + } + bdev->rq = rq; + nr_max_blk = min(scmdev->nr_max_block, + (unsigned int) (PAGE_SIZE / sizeof(struct aidaw))); + + blk_queue_logical_block_size(rq, 1 << 12); + blk_queue_max_hw_sectors(rq, nr_max_blk << 3); /* 8 * 512 = blk_size */ + blk_queue_max_segments(rq, nr_max_blk); + blk_queue_flag_set(QUEUE_FLAG_NONROT, rq); + blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, rq); + + bdev->gendisk = alloc_disk(SCM_NR_PARTS); + if (!bdev->gendisk) { + ret = -ENOMEM; + goto out_queue; + } + rq->queuedata = scmdev; + bdev->gendisk->private_data = scmdev; + bdev->gendisk->fops = &scm_blk_devops; + bdev->gendisk->queue = rq; + bdev->gendisk->major = scm_major; + bdev->gendisk->first_minor = devindex * SCM_NR_PARTS; + + len = snprintf(bdev->gendisk->disk_name, DISK_NAME_LEN, "scm"); + if (devindex > 25) { + len += snprintf(bdev->gendisk->disk_name + len, + DISK_NAME_LEN - len, "%c", + 'a' + (devindex / 26) - 1); + devindex = devindex % 26; + } + snprintf(bdev->gendisk->disk_name + len, DISK_NAME_LEN - len, "%c", + 'a' + devindex); + + /* 512 byte sectors */ + set_capacity(bdev->gendisk, scmdev->size >> 9); + device_add_disk(&scmdev->dev, bdev->gendisk, NULL); + return 0; + +out_queue: + blk_cleanup_queue(rq); +out_tag: + blk_mq_free_tag_set(&bdev->tag_set); +out: + atomic_dec(&nr_devices); + return ret; +} + +void scm_blk_dev_cleanup(struct scm_blk_dev *bdev) +{ + del_gendisk(bdev->gendisk); + blk_cleanup_queue(bdev->gendisk->queue); + blk_mq_free_tag_set(&bdev->tag_set); + put_disk(bdev->gendisk); +} + +void scm_blk_set_available(struct scm_blk_dev *bdev) +{ + unsigned long flags; + + spin_lock_irqsave(&bdev->lock, flags); + if (bdev->state == SCM_WR_PROHIBIT) + pr_info("%lx: Write access to the SCM increment is restored\n", + (unsigned long) bdev->scmdev->address); + bdev->state = SCM_OPER; + spin_unlock_irqrestore(&bdev->lock, flags); +} + +static bool __init scm_blk_params_valid(void) +{ + if (!nr_requests_per_io || nr_requests_per_io > 64) + return false; + + return true; +} + +static int __init scm_blk_init(void) +{ + int ret = -EINVAL; + + if (!scm_blk_params_valid()) + goto out; + + ret = register_blkdev(0, "scm"); + if (ret < 0) + goto out; + + scm_major = ret; + ret = scm_alloc_rqs(nr_requests); + if (ret) + goto out_free; + + scm_debug = debug_register("scm_log", 16, 1, 16); + if (!scm_debug) { + ret = -ENOMEM; + goto out_free; + } + + debug_register_view(scm_debug, &debug_hex_ascii_view); + debug_set_level(scm_debug, 2); + + ret = scm_drv_init(); + if (ret) + goto out_dbf; + + return ret; + +out_dbf: + debug_unregister(scm_debug); +out_free: + scm_free_rqs(); + unregister_blkdev(scm_major, "scm"); +out: + return ret; +} +module_init(scm_blk_init); + +static void __exit scm_blk_cleanup(void) +{ + scm_drv_cleanup(); + debug_unregister(scm_debug); + scm_free_rqs(); + unregister_blkdev(scm_major, "scm"); +} +module_exit(scm_blk_cleanup); diff --git a/drivers/s390/block/scm_blk.h b/drivers/s390/block/scm_blk.h new file mode 100644 index 000000000..a05a4297c --- /dev/null +++ b/drivers/s390/block/scm_blk.h @@ -0,0 +1,77 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef SCM_BLK_H +#define SCM_BLK_H + +#include +#include +#include +#include +#include +#include + +#include +#include + +#define SCM_NR_PARTS 8 +#define SCM_QUEUE_DELAY 5 + +struct scm_blk_dev { + struct request_queue *rq; + struct gendisk *gendisk; + struct blk_mq_tag_set tag_set; + struct scm_device *scmdev; + spinlock_t lock; + atomic_t queued_reqs; + enum {SCM_OPER, SCM_WR_PROHIBIT} state; + struct list_head finished_requests; +}; + +struct scm_request { + struct scm_blk_dev *bdev; + struct aidaw *next_aidaw; + struct request **request; + struct aob *aob; + struct list_head list; + u8 retries; + blk_status_t error; +}; + +#define to_aobrq(rq) container_of((void *) rq, struct aob_rq_header, data) + +int scm_blk_dev_setup(struct scm_blk_dev *, struct scm_device *); +void scm_blk_dev_cleanup(struct scm_blk_dev *); +void scm_blk_set_available(struct scm_blk_dev *); +void scm_blk_irq(struct scm_device *, void *, blk_status_t); + +struct aidaw *scm_aidaw_fetch(struct scm_request *scmrq, unsigned int bytes); + +int scm_drv_init(void); +void scm_drv_cleanup(void); + +extern debug_info_t *scm_debug; + +#define SCM_LOG(imp, txt) do { \ + debug_text_event(scm_debug, imp, txt); \ + } while (0) + +static inline void SCM_LOG_HEX(int level, void *data, int length) +{ + debug_event(scm_debug, level, data, length); +} + +static inline void SCM_LOG_STATE(int level, struct scm_device *scmdev) +{ + struct { + u64 address; + u8 oper_state; + u8 rank; + } __packed data = { + .address = scmdev->address, + .oper_state = scmdev->attrs.oper_state, + .rank = scmdev->attrs.rank, + }; + + SCM_LOG_HEX(level, &data, sizeof(data)); +} + +#endif /* SCM_BLK_H */ diff --git a/drivers/s390/block/scm_drv.c b/drivers/s390/block/scm_drv.c new file mode 100644 index 000000000..3134fd6e0 --- /dev/null +++ b/drivers/s390/block/scm_drv.c @@ -0,0 +1,93 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Device driver for s390 storage class memory. + * + * Copyright IBM Corp. 2012 + * Author(s): Sebastian Ott + */ + +#define KMSG_COMPONENT "scm_block" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include "scm_blk.h" + +static void scm_notify(struct scm_device *scmdev, enum scm_event event) +{ + struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev); + + switch (event) { + case SCM_CHANGE: + pr_info("%lx: The capabilities of the SCM increment changed\n", + (unsigned long) scmdev->address); + SCM_LOG(2, "State changed"); + SCM_LOG_STATE(2, scmdev); + break; + case SCM_AVAIL: + SCM_LOG(2, "Increment available"); + SCM_LOG_STATE(2, scmdev); + scm_blk_set_available(bdev); + break; + } +} + +static int scm_probe(struct scm_device *scmdev) +{ + struct scm_blk_dev *bdev; + int ret; + + SCM_LOG(2, "probe"); + SCM_LOG_STATE(2, scmdev); + + if (scmdev->attrs.oper_state != OP_STATE_GOOD) + return -EINVAL; + + bdev = kzalloc(sizeof(*bdev), GFP_KERNEL); + if (!bdev) + return -ENOMEM; + + dev_set_drvdata(&scmdev->dev, bdev); + ret = scm_blk_dev_setup(bdev, scmdev); + if (ret) { + dev_set_drvdata(&scmdev->dev, NULL); + kfree(bdev); + goto out; + } + +out: + return ret; +} + +static int scm_remove(struct scm_device *scmdev) +{ + struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev); + + scm_blk_dev_cleanup(bdev); + dev_set_drvdata(&scmdev->dev, NULL); + kfree(bdev); + + return 0; +} + +static struct scm_driver scm_drv = { + .drv = { + .name = "scm_block", + .owner = THIS_MODULE, + }, + .notify = scm_notify, + .probe = scm_probe, + .remove = scm_remove, + .handler = scm_blk_irq, +}; + +int __init scm_drv_init(void) +{ + return scm_driver_register(&scm_drv); +} + +void scm_drv_cleanup(void) +{ + scm_driver_unregister(&scm_drv); +} diff --git a/drivers/s390/block/xpram.c b/drivers/s390/block/xpram.c new file mode 100644 index 000000000..3df5d68d0 --- /dev/null +++ b/drivers/s390/block/xpram.c @@ -0,0 +1,481 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Xpram.c -- the S/390 expanded memory RAM-disk + * + * significant parts of this code are based on + * the sbull device driver presented in + * A. Rubini: Linux Device Drivers + * + * Author of XPRAM specific coding: Reinhard Buendgen + * buendgen@de.ibm.com + * Rewrite for 2.5: Martin Schwidefsky + * + * External interfaces: + * Interfaces to linux kernel + * xpram_setup: read kernel parameters + * Device specific file operations + * xpram_iotcl + * xpram_open + * + * "ad-hoc" partitioning: + * the expanded memory can be partitioned among several devices + * (with different minors). The partitioning set up can be + * set by kernel or module parameters (int devs & int sizes[]) + * + * Potential future improvements: + * generic hard disk support to replace ad-hoc partitioning + */ + +#define KMSG_COMPONENT "xpram" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include /* isdigit, isxdigit */ +#include +#include +#include +#include +#include /* HDIO_GETGEO */ +#include +#include +#include +#include +#include +#include + +#define XPRAM_NAME "xpram" +#define XPRAM_DEVS 1 /* one partition */ +#define XPRAM_MAX_DEVS 32 /* maximal number of devices (partitions) */ + +typedef struct { + unsigned int size; /* size of xpram segment in pages */ + unsigned int offset; /* start page of xpram segment */ +} xpram_device_t; + +static xpram_device_t xpram_devices[XPRAM_MAX_DEVS]; +static unsigned int xpram_sizes[XPRAM_MAX_DEVS]; +static struct gendisk *xpram_disks[XPRAM_MAX_DEVS]; +static struct request_queue *xpram_queues[XPRAM_MAX_DEVS]; +static unsigned int xpram_pages; +static int xpram_devs; + +/* + * Parameter parsing functions. + */ +static int devs = XPRAM_DEVS; +static char *sizes[XPRAM_MAX_DEVS]; + +module_param(devs, int, 0); +module_param_array(sizes, charp, NULL, 0); + +MODULE_PARM_DESC(devs, "number of devices (\"partitions\"), " \ + "the default is " __MODULE_STRING(XPRAM_DEVS) "\n"); +MODULE_PARM_DESC(sizes, "list of device (partition) sizes " \ + "the defaults are 0s \n" \ + "All devices with size 0 equally partition the " + "remaining space on the expanded strorage not " + "claimed by explicit sizes\n"); +MODULE_LICENSE("GPL"); + +/* + * Copy expanded memory page (4kB) into main memory + * Arguments + * page_addr: address of target page + * xpage_index: index of expandeded memory page + * Return value + * 0: if operation succeeds + * -EIO: if pgin failed + * -ENXIO: if xpram has vanished + */ +static int xpram_page_in (unsigned long page_addr, unsigned int xpage_index) +{ + int cc = 2; /* return unused cc 2 if pgin traps */ + + asm volatile( + " .insn rre,0xb22e0000,%1,%2\n" /* pgin %1,%2 */ + "0: ipm %0\n" + " srl %0,28\n" + "1:\n" + EX_TABLE(0b,1b) + : "+d" (cc) : "a" (__pa(page_addr)), "d" (xpage_index) : "cc"); + if (cc == 3) + return -ENXIO; + if (cc == 2) + return -ENXIO; + if (cc == 1) + return -EIO; + return 0; +} + +/* + * Copy a 4kB page of main memory to an expanded memory page + * Arguments + * page_addr: address of source page + * xpage_index: index of expandeded memory page + * Return value + * 0: if operation succeeds + * -EIO: if pgout failed + * -ENXIO: if xpram has vanished + */ +static long xpram_page_out (unsigned long page_addr, unsigned int xpage_index) +{ + int cc = 2; /* return unused cc 2 if pgin traps */ + + asm volatile( + " .insn rre,0xb22f0000,%1,%2\n" /* pgout %1,%2 */ + "0: ipm %0\n" + " srl %0,28\n" + "1:\n" + EX_TABLE(0b,1b) + : "+d" (cc) : "a" (__pa(page_addr)), "d" (xpage_index) : "cc"); + if (cc == 3) + return -ENXIO; + if (cc == 2) + return -ENXIO; + if (cc == 1) + return -EIO; + return 0; +} + +/* + * Check if xpram is available. + */ +static int xpram_present(void) +{ + unsigned long mem_page; + int rc; + + mem_page = (unsigned long) __get_free_page(GFP_KERNEL); + if (!mem_page) + return -ENOMEM; + rc = xpram_page_in(mem_page, 0); + free_page(mem_page); + return rc ? -ENXIO : 0; +} + +/* + * Return index of the last available xpram page. + */ +static unsigned long xpram_highest_page_index(void) +{ + unsigned int page_index, add_bit; + unsigned long mem_page; + + mem_page = (unsigned long) __get_free_page(GFP_KERNEL); + if (!mem_page) + return 0; + + page_index = 0; + add_bit = 1ULL << (sizeof(unsigned int)*8 - 1); + while (add_bit > 0) { + if (xpram_page_in(mem_page, page_index | add_bit) == 0) + page_index |= add_bit; + add_bit >>= 1; + } + + free_page (mem_page); + + return page_index; +} + +/* + * Block device make request function. + */ +static blk_qc_t xpram_make_request(struct request_queue *q, struct bio *bio) +{ + xpram_device_t *xdev = bio->bi_disk->private_data; + struct bio_vec bvec; + struct bvec_iter iter; + unsigned int index; + unsigned long page_addr; + unsigned long bytes; + + blk_queue_split(q, &bio); + + if ((bio->bi_iter.bi_sector & 7) != 0 || + (bio->bi_iter.bi_size & 4095) != 0) + /* Request is not page-aligned. */ + goto fail; + if ((bio->bi_iter.bi_size >> 12) > xdev->size) + /* Request size is no page-aligned. */ + goto fail; + if ((bio->bi_iter.bi_sector >> 3) > 0xffffffffU - xdev->offset) + goto fail; + index = (bio->bi_iter.bi_sector >> 3) + xdev->offset; + bio_for_each_segment(bvec, bio, iter) { + page_addr = (unsigned long) + kmap(bvec.bv_page) + bvec.bv_offset; + bytes = bvec.bv_len; + if ((page_addr & 4095) != 0 || (bytes & 4095) != 0) + /* More paranoia. */ + goto fail; + while (bytes > 0) { + if (bio_data_dir(bio) == READ) { + if (xpram_page_in(page_addr, index) != 0) + goto fail; + } else { + if (xpram_page_out(page_addr, index) != 0) + goto fail; + } + page_addr += 4096; + bytes -= 4096; + index++; + } + } + bio_endio(bio); + return BLK_QC_T_NONE; +fail: + bio_io_error(bio); + return BLK_QC_T_NONE; +} + +static int xpram_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + unsigned long size; + + /* + * get geometry: we have to fake one... trim the size to a + * multiple of 64 (32k): tell we have 16 sectors, 4 heads, + * whatever cylinders. Tell also that data starts at sector. 4. + */ + size = (xpram_pages * 8) & ~0x3f; + geo->cylinders = size >> 6; + geo->heads = 4; + geo->sectors = 16; + geo->start = 4; + return 0; +} + +static const struct block_device_operations xpram_devops = +{ + .owner = THIS_MODULE, + .getgeo = xpram_getgeo, +}; + +/* + * Setup xpram_sizes array. + */ +static int __init xpram_setup_sizes(unsigned long pages) +{ + unsigned long mem_needed; + unsigned long mem_auto; + unsigned long long size; + char *sizes_end; + int mem_auto_no; + int i; + + /* Check number of devices. */ + if (devs <= 0 || devs > XPRAM_MAX_DEVS) { + pr_err("%d is not a valid number of XPRAM devices\n",devs); + return -EINVAL; + } + xpram_devs = devs; + + /* + * Copy sizes array to xpram_sizes and align partition + * sizes to page boundary. + */ + mem_needed = 0; + mem_auto_no = 0; + for (i = 0; i < xpram_devs; i++) { + if (sizes[i]) { + size = simple_strtoull(sizes[i], &sizes_end, 0); + switch (*sizes_end) { + case 'g': + case 'G': + size <<= 20; + break; + case 'm': + case 'M': + size <<= 10; + } + xpram_sizes[i] = (size + 3) & -4UL; + } + if (xpram_sizes[i]) + mem_needed += xpram_sizes[i]; + else + mem_auto_no++; + } + + pr_info(" number of devices (partitions): %d \n", xpram_devs); + for (i = 0; i < xpram_devs; i++) { + if (xpram_sizes[i]) + pr_info(" size of partition %d: %u kB\n", + i, xpram_sizes[i]); + else + pr_info(" size of partition %d to be set " + "automatically\n",i); + } + pr_info(" memory needed (for sized partitions): %lu kB\n", + mem_needed); + pr_info(" partitions to be sized automatically: %d\n", + mem_auto_no); + + if (mem_needed > pages * 4) { + pr_err("Not enough expanded memory available\n"); + return -EINVAL; + } + + /* + * partitioning: + * xpram_sizes[i] != 0; partition i has size xpram_sizes[i] kB + * else: ; all partitions with zero xpram_sizes[i] + * partition equally the remaining space + */ + if (mem_auto_no) { + mem_auto = ((pages - mem_needed / 4) / mem_auto_no) * 4; + pr_info(" automatically determined " + "partition size: %lu kB\n", mem_auto); + for (i = 0; i < xpram_devs; i++) + if (xpram_sizes[i] == 0) + xpram_sizes[i] = mem_auto; + } + return 0; +} + +static int __init xpram_setup_blkdev(void) +{ + unsigned long offset; + int i, rc = -ENOMEM; + + for (i = 0; i < xpram_devs; i++) { + xpram_disks[i] = alloc_disk(1); + if (!xpram_disks[i]) + goto out; + xpram_queues[i] = blk_alloc_queue(GFP_KERNEL); + if (!xpram_queues[i]) { + put_disk(xpram_disks[i]); + goto out; + } + blk_queue_flag_set(QUEUE_FLAG_NONROT, xpram_queues[i]); + blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, xpram_queues[i]); + blk_queue_make_request(xpram_queues[i], xpram_make_request); + blk_queue_logical_block_size(xpram_queues[i], 4096); + } + + /* + * Register xpram major. + */ + rc = register_blkdev(XPRAM_MAJOR, XPRAM_NAME); + if (rc < 0) + goto out; + + /* + * Setup device structures. + */ + offset = 0; + for (i = 0; i < xpram_devs; i++) { + struct gendisk *disk = xpram_disks[i]; + + xpram_devices[i].size = xpram_sizes[i] / 4; + xpram_devices[i].offset = offset; + offset += xpram_devices[i].size; + disk->major = XPRAM_MAJOR; + disk->first_minor = i; + disk->fops = &xpram_devops; + disk->private_data = &xpram_devices[i]; + disk->queue = xpram_queues[i]; + sprintf(disk->disk_name, "slram%d", i); + set_capacity(disk, xpram_sizes[i] << 1); + add_disk(disk); + } + + return 0; +out: + while (i--) { + blk_cleanup_queue(xpram_queues[i]); + put_disk(xpram_disks[i]); + } + return rc; +} + +/* + * Resume failed: Print error message and call panic. + */ +static void xpram_resume_error(const char *message) +{ + pr_err("Resuming the system failed: %s\n", message); + panic("xpram resume error\n"); +} + +/* + * Check if xpram setup changed between suspend and resume. + */ +static int xpram_restore(struct device *dev) +{ + if (!xpram_pages) + return 0; + if (xpram_present() != 0) + xpram_resume_error("xpram disappeared"); + if (xpram_pages != xpram_highest_page_index() + 1) + xpram_resume_error("Size of xpram changed"); + return 0; +} + +static const struct dev_pm_ops xpram_pm_ops = { + .restore = xpram_restore, +}; + +static struct platform_driver xpram_pdrv = { + .driver = { + .name = XPRAM_NAME, + .pm = &xpram_pm_ops, + }, +}; + +static struct platform_device *xpram_pdev; + +/* + * Finally, the init/exit functions. + */ +static void __exit xpram_exit(void) +{ + int i; + for (i = 0; i < xpram_devs; i++) { + del_gendisk(xpram_disks[i]); + blk_cleanup_queue(xpram_queues[i]); + put_disk(xpram_disks[i]); + } + unregister_blkdev(XPRAM_MAJOR, XPRAM_NAME); + platform_device_unregister(xpram_pdev); + platform_driver_unregister(&xpram_pdrv); +} + +static int __init xpram_init(void) +{ + int rc; + + /* Find out size of expanded memory. */ + if (xpram_present() != 0) { + pr_err("No expanded memory available\n"); + return -ENODEV; + } + xpram_pages = xpram_highest_page_index() + 1; + pr_info(" %u pages expanded memory found (%lu KB).\n", + xpram_pages, (unsigned long) xpram_pages*4); + rc = xpram_setup_sizes(xpram_pages); + if (rc) + return rc; + rc = platform_driver_register(&xpram_pdrv); + if (rc) + return rc; + xpram_pdev = platform_device_register_simple(XPRAM_NAME, -1, NULL, 0); + if (IS_ERR(xpram_pdev)) { + rc = PTR_ERR(xpram_pdev); + goto fail_platform_driver_unregister; + } + rc = xpram_setup_blkdev(); + if (rc) + goto fail_platform_device_unregister; + return 0; + +fail_platform_device_unregister: + platform_device_unregister(xpram_pdev); +fail_platform_driver_unregister: + platform_driver_unregister(&xpram_pdrv); + return rc; +} + +module_init(xpram_init); +module_exit(xpram_exit); diff --git a/drivers/s390/char/Kconfig b/drivers/s390/char/Kconfig new file mode 100644 index 000000000..ab0b243a9 --- /dev/null +++ b/drivers/s390/char/Kconfig @@ -0,0 +1,208 @@ +# SPDX-License-Identifier: GPL-2.0 +comment "S/390 character device drivers" + depends on S390 + +config TN3270 + def_tristate y + prompt "Support for locally attached 3270 terminals" + depends on CCW + help + Include support for IBM 3270 terminals. + +config TN3270_TTY + def_tristate y + prompt "Support for tty input/output on 3270 terminals" + depends on TN3270 && TTY + help + Include support for using an IBM 3270 terminal as a Linux tty. + +config TN3270_FS + def_tristate m + prompt "Support for fullscreen applications on 3270 terminals" + depends on TN3270 + help + Include support for fullscreen applications on an IBM 3270 terminal. + +config TN3270_CONSOLE + def_bool y + prompt "Support for console on 3270 terminal" + depends on TN3270=y && TN3270_TTY=y + help + Include support for using an IBM 3270 terminal as a Linux system + console. Available only if 3270 support is compiled in statically. + +config TN3215 + def_bool y + prompt "Support for 3215 line mode terminal" + depends on CCW && TTY + help + Include support for IBM 3215 line-mode terminals. + +config TN3215_CONSOLE + def_bool y + prompt "Support for console on 3215 line mode terminal" + depends on TN3215 + help + Include support for using an IBM 3215 line-mode terminal as a + Linux system console. + +config CCW_CONSOLE + def_bool y if TN3215_CONSOLE || TN3270_CONSOLE + +config SCLP_TTY + def_bool y + prompt "Support for SCLP line mode terminal" + depends on S390 && TTY + help + Include support for IBM SCLP line-mode terminals. + +config SCLP_CONSOLE + def_bool y + prompt "Support for console on SCLP line mode terminal" + depends on SCLP_TTY + help + Include support for using an IBM HWC line-mode terminal as the Linux + system console. + +config SCLP_VT220_TTY + def_bool y + prompt "Support for SCLP VT220-compatible terminal" + depends on S390 && TTY + help + Include support for an IBM SCLP VT220-compatible terminal. + +config SCLP_VT220_CONSOLE + def_bool y + prompt "Support for console on SCLP VT220-compatible terminal" + depends on SCLP_VT220_TTY + help + Include support for using an IBM SCLP VT220-compatible terminal as a + Linux system console. + +config SCLP_ASYNC + def_tristate m + prompt "Support for Call Home via Asynchronous SCLP Records" + depends on S390 + help + This option enables the call home function, which is able to inform + the service element and connected organisations about a kernel panic. + You should only select this option if you know what you are doing, + want for inform other people about your kernel panics, + need this feature and intend to run your kernel in LPAR. + +config SCLP_ASYNC_ID + string "Component ID for Call Home" + depends on SCLP_ASYNC + default "000000000" + help + The Component ID for Call Home is used to identify the correct + problem reporting queue the call home records should be sent to. + + If your are unsure, please use the default value "000000000". + +config HMC_DRV + def_tristate m + prompt "Support for file transfers from HMC drive CD/DVD-ROM" + depends on S390 + select CRC16 + help + This option enables support for file transfers from a Hardware + Management Console (HMC) drive CD/DVD-ROM. It is available as a + module, called 'hmcdrv', and also as kernel built-in. There is one + optional parameter for this module: cachesize=N, which modifies the + transfer cache size from it's default value 0.5MB to N bytes. If N + is zero, then no caching is performed. + +config SCLP_OFB + def_bool n + prompt "Support for Open-for-Business SCLP Event" + depends on S390 + help + This option enables the Open-for-Business interface to the s390 + Service Element. + +config S390_TAPE + def_tristate m + prompt "S/390 tape device support" + depends on CCW + help + Select this option if you want to access channel-attached tape + devices on IBM S/390 or zSeries. + If you select this option you will also want to select at + least one of the tape interface options and one of the tape + hardware options in order to access a tape device. + This option is also available as a module. The module will be + called tape390 and include all selected interfaces and + hardware drivers. + +comment "S/390 tape hardware support" + depends on S390_TAPE + +config S390_TAPE_34XX + def_tristate m + prompt "Support for 3480/3490 tape hardware" + depends on S390_TAPE + help + Select this option if you want to access IBM 3480/3490 magnetic + tape subsystems and 100% compatibles. + It is safe to say "Y" here. + +config S390_TAPE_3590 + def_tristate m + prompt "Support for 3590 tape hardware" + depends on S390_TAPE + help + Select this option if you want to access IBM 3590 magnetic + tape subsystems and 100% compatibles. + It is safe to say "Y" here. + +config VMLOGRDR + def_tristate m + prompt "Support for the z/VM recording system services (VM only)" + depends on IUCV + help + Select this option if you want to be able to receive records collected + by the z/VM recording system services, eg. from *LOGREC, *ACCOUNT or + *SYMPTOM. + This driver depends on the IUCV support driver. + +config VMCP + def_bool y + prompt "Support for the z/VM CP interface" + depends on S390 + select CMA + help + Select this option if you want to be able to interact with the control + program on z/VM + +config VMCP_CMA_SIZE + int "Memory in MiB reserved for z/VM CP interface" + default "4" + depends on VMCP + help + Specify the default amount of memory in MiB reserved for the z/VM CP + interface. If needed this memory is used for large contiguous memory + allocations. The default can be changed with the kernel command line + parameter "vmcp_cma". + +config MONREADER + def_tristate m + prompt "API for reading z/VM monitor service records" + depends on IUCV + help + Character device driver for reading z/VM monitor service records + +config MONWRITER + def_tristate m + prompt "API for writing z/VM monitor service records" + depends on S390 + help + Character device driver for writing z/VM monitor service records + +config S390_VMUR + def_tristate m + prompt "z/VM unit record device driver" + depends on S390 + help + Character device driver for z/VM reader, puncher and printer. + diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile new file mode 100644 index 000000000..3072b8978 --- /dev/null +++ b/drivers/s390/char/Makefile @@ -0,0 +1,55 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# S/390 character devices +# + +ifdef CONFIG_FUNCTION_TRACER +# Do not trace early setup code +CFLAGS_REMOVE_sclp_early_core.o = $(CC_FLAGS_FTRACE) +endif + +GCOV_PROFILE_sclp_early_core.o := n +KCOV_INSTRUMENT_sclp_early_core.o := n +UBSAN_SANITIZE_sclp_early_core.o := n +KASAN_SANITIZE_sclp_early_core.o := n + +CFLAGS_sclp_early_core.o += -D__NO_FORTIFY + +CFLAGS_REMOVE_sclp_early_core.o += $(CC_FLAGS_EXPOLINE) + +obj-y += ctrlchar.o keyboard.o defkeymap.o sclp.o sclp_rw.o sclp_quiesce.o \ + sclp_cmd.o sclp_config.o sclp_cpi_sys.o sclp_ocf.o sclp_ctl.o \ + sclp_early.o sclp_early_core.o sclp_sd.o + +obj-$(CONFIG_TN3270) += raw3270.o +obj-$(CONFIG_TN3270_CONSOLE) += con3270.o +obj-$(CONFIG_TN3270_TTY) += tty3270.o +obj-$(CONFIG_TN3270_FS) += fs3270.o + +obj-$(CONFIG_TN3215) += con3215.o + +obj-$(CONFIG_SCLP_TTY) += sclp_tty.o +obj-$(CONFIG_SCLP_CONSOLE) += sclp_con.o +obj-$(CONFIG_SCLP_VT220_TTY) += sclp_vt220.o +obj-$(CONFIG_SCLP_ASYNC) += sclp_async.o + +obj-$(CONFIG_PCI) += sclp_pci.o + +obj-$(CONFIG_VMLOGRDR) += vmlogrdr.o +obj-$(CONFIG_VMCP) += vmcp.o + +tape-$(CONFIG_PROC_FS) += tape_proc.o +tape-objs := tape_core.o tape_std.o tape_char.o $(tape-y) +obj-$(CONFIG_S390_TAPE) += tape.o tape_class.o +obj-$(CONFIG_S390_TAPE_34XX) += tape_34xx.o +obj-$(CONFIG_S390_TAPE_3590) += tape_3590.o +obj-$(CONFIG_MONREADER) += monreader.o +obj-$(CONFIG_MONWRITER) += monwriter.o +obj-$(CONFIG_S390_VMUR) += vmur.o +obj-$(CONFIG_CRASH_DUMP) += sclp_sdias.o zcore.o + +hmcdrv-objs := hmcdrv_mod.o hmcdrv_dev.o hmcdrv_ftp.o hmcdrv_cache.o diag_ftp.o sclp_ftp.o +obj-$(CONFIG_HMC_DRV) += hmcdrv.o + +chkbss := sclp_early_core.o +include $(srctree)/arch/s390/scripts/Makefile.chkbss diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c new file mode 100644 index 000000000..8c9d412b6 --- /dev/null +++ b/drivers/s390/char/con3215.c @@ -0,0 +1,1218 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 3215 line mode terminal driver. + * + * Copyright IBM Corp. 1999, 2009 + * Author(s): Martin Schwidefsky + * + * Updated: + * Aug-2000: Added tab support + * Dan Morrison, IBM Corporation + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include /* ASYNC_* flags */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "ctrlchar.h" + +#define NR_3215 1 +#define NR_3215_REQ (4*NR_3215) +#define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ +#define RAW3215_INBUF_SIZE 256 /* input buffer size */ +#define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ +#define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ +#define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ +#define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ +#define RAW3215_NR_CCWS 3 +#define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ + +#define RAW3215_FIXED 1 /* 3215 console device is not be freed */ +#define RAW3215_WORKING 4 /* set if a request is being worked on */ +#define RAW3215_THROTTLED 8 /* set if reading is disabled */ +#define RAW3215_STOPPED 16 /* set if writing is disabled */ +#define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ +#define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ + +#define TAB_STOP_SIZE 8 /* tab stop size */ + +/* + * Request types for a 3215 device + */ +enum raw3215_type { + RAW3215_FREE, RAW3215_READ, RAW3215_WRITE +}; + +/* + * Request structure for a 3215 device + */ +struct raw3215_req { + enum raw3215_type type; /* type of the request */ + int start, len; /* start index & len in output buffer */ + int delayable; /* indication to wait for more data */ + int residual; /* residual count for read request */ + struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ + struct raw3215_info *info; /* pointer to main structure */ + struct raw3215_req *next; /* pointer to next request */ +} __attribute__ ((aligned(8))); + +struct raw3215_info { + struct tty_port port; + struct ccw_device *cdev; /* device for tty driver */ + spinlock_t *lock; /* pointer to irq lock */ + int flags; /* state flags */ + char *buffer; /* pointer to output buffer */ + char *inbuf; /* pointer to input buffer */ + int head; /* first free byte in output buffer */ + int count; /* number of bytes in output buffer */ + int written; /* number of bytes in write requests */ + struct raw3215_req *queued_read; /* pointer to queued read requests */ + struct raw3215_req *queued_write;/* pointer to queued write requests */ + struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */ + wait_queue_head_t empty_wait; /* wait queue for flushing */ + struct timer_list timer; /* timer for delayed output */ + int line_pos; /* position on the line (for tabs) */ + char ubuffer[80]; /* copy_from_user buffer */ +}; + +/* array of 3215 devices structures */ +static struct raw3215_info *raw3215[NR_3215]; +/* spinlock to protect the raw3215 array */ +static DEFINE_SPINLOCK(raw3215_device_lock); +/* list of free request structures */ +static struct raw3215_req *raw3215_freelist; +/* spinlock to protect free list */ +static spinlock_t raw3215_freelist_lock; + +static struct tty_driver *tty3215_driver; + +/* + * Get a request structure from the free list + */ +static inline struct raw3215_req *raw3215_alloc_req(void) +{ + struct raw3215_req *req; + unsigned long flags; + + spin_lock_irqsave(&raw3215_freelist_lock, flags); + req = raw3215_freelist; + raw3215_freelist = req->next; + spin_unlock_irqrestore(&raw3215_freelist_lock, flags); + return req; +} + +/* + * Put a request structure back to the free list + */ +static inline void raw3215_free_req(struct raw3215_req *req) +{ + unsigned long flags; + + if (req->type == RAW3215_FREE) + return; /* don't free a free request */ + req->type = RAW3215_FREE; + spin_lock_irqsave(&raw3215_freelist_lock, flags); + req->next = raw3215_freelist; + raw3215_freelist = req; + spin_unlock_irqrestore(&raw3215_freelist_lock, flags); +} + +/* + * Set up a read request that reads up to 160 byte from the 3215 device. + * If there is a queued read request it is used, but that shouldn't happen + * because a 3215 terminal won't accept a new read before the old one is + * completed. + */ +static void raw3215_mk_read_req(struct raw3215_info *raw) +{ + struct raw3215_req *req; + struct ccw1 *ccw; + + /* there can only be ONE read request at a time */ + req = raw->queued_read; + if (req == NULL) { + /* no queued read request, use new req structure */ + req = raw3215_alloc_req(); + req->type = RAW3215_READ; + req->info = raw; + raw->queued_read = req; + } + + ccw = req->ccws; + ccw->cmd_code = 0x0A; /* read inquiry */ + ccw->flags = 0x20; /* ignore incorrect length */ + ccw->count = 160; + ccw->cda = (__u32) __pa(raw->inbuf); +} + +/* + * Set up a write request with the information from the main structure. + * A ccw chain is created that writes as much as possible from the output + * buffer to the 3215 device. If a queued write exists it is replaced by + * the new, probably lengthened request. + */ +static void raw3215_mk_write_req(struct raw3215_info *raw) +{ + struct raw3215_req *req; + struct ccw1 *ccw; + int len, count, ix, lines; + + if (raw->count <= raw->written) + return; + /* check if there is a queued write request */ + req = raw->queued_write; + if (req == NULL) { + /* no queued write request, use new req structure */ + req = raw3215_alloc_req(); + req->type = RAW3215_WRITE; + req->info = raw; + raw->queued_write = req; + } else { + raw->written -= req->len; + } + + ccw = req->ccws; + req->start = (raw->head - raw->count + raw->written) & + (RAW3215_BUFFER_SIZE - 1); + /* + * now we have to count newlines. We can at max accept + * RAW3215_MAX_NEWLINE newlines in a single ssch due to + * a restriction in VM + */ + lines = 0; + ix = req->start; + while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { + if (raw->buffer[ix] == 0x15) + lines++; + ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); + } + len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; + if (len > RAW3215_MAX_BYTES) + len = RAW3215_MAX_BYTES; + req->len = len; + raw->written += len; + + /* set the indication if we should try to enlarge this request */ + req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); + + ix = req->start; + while (len > 0) { + if (ccw > req->ccws) + ccw[-1].flags |= 0x40; /* use command chaining */ + ccw->cmd_code = 0x01; /* write, auto carrier return */ + ccw->flags = 0x20; /* ignore incorrect length ind. */ + ccw->cda = + (__u32) __pa(raw->buffer + ix); + count = len; + if (ix + count > RAW3215_BUFFER_SIZE) + count = RAW3215_BUFFER_SIZE - ix; + ccw->count = count; + len -= count; + ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); + ccw++; + } + /* + * Add a NOP to the channel program. 3215 devices are purely + * emulated and its much better to avoid the channel end + * interrupt in this case. + */ + if (ccw > req->ccws) + ccw[-1].flags |= 0x40; /* use command chaining */ + ccw->cmd_code = 0x03; /* NOP */ + ccw->flags = 0; + ccw->cda = 0; + ccw->count = 1; +} + +/* + * Start a read or a write request + */ +static void raw3215_start_io(struct raw3215_info *raw) +{ + struct raw3215_req *req; + int res; + + req = raw->queued_read; + if (req != NULL && + !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { + /* dequeue request */ + raw->queued_read = NULL; + res = ccw_device_start(raw->cdev, req->ccws, + (unsigned long) req, 0, 0); + if (res != 0) { + /* do_IO failed, put request back to queue */ + raw->queued_read = req; + } else { + raw->flags |= RAW3215_WORKING; + } + } + req = raw->queued_write; + if (req != NULL && + !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { + /* dequeue request */ + raw->queued_write = NULL; + res = ccw_device_start(raw->cdev, req->ccws, + (unsigned long) req, 0, 0); + if (res != 0) { + /* do_IO failed, put request back to queue */ + raw->queued_write = req; + } else { + raw->flags |= RAW3215_WORKING; + } + } +} + +/* + * Function to start a delayed output after RAW3215_TIMEOUT seconds + */ +static void raw3215_timeout(struct timer_list *t) +{ + struct raw3215_info *raw = from_timer(raw, t, timer); + unsigned long flags; + + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + raw->flags &= ~RAW3215_TIMER_RUNS; + if (!tty_port_suspended(&raw->port)) { + raw3215_mk_write_req(raw); + raw3215_start_io(raw); + if ((raw->queued_read || raw->queued_write) && + !(raw->flags & RAW3215_WORKING) && + !(raw->flags & RAW3215_TIMER_RUNS)) { + raw->timer.expires = RAW3215_TIMEOUT + jiffies; + add_timer(&raw->timer); + raw->flags |= RAW3215_TIMER_RUNS; + } + } + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); +} + +/* + * Function to conditionally start an IO. A read is started immediately, + * a write is only started immediately if the flush flag is on or the + * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not + * done immediately a timer is started with a delay of RAW3215_TIMEOUT. + */ +static inline void raw3215_try_io(struct raw3215_info *raw) +{ + if (!tty_port_initialized(&raw->port) || tty_port_suspended(&raw->port)) + return; + if (raw->queued_read != NULL) + raw3215_start_io(raw); + else if (raw->queued_write != NULL) { + if ((raw->queued_write->delayable == 0) || + (raw->flags & RAW3215_FLUSHING)) { + /* execute write requests bigger than minimum size */ + raw3215_start_io(raw); + } + } + if ((raw->queued_read || raw->queued_write) && + !(raw->flags & RAW3215_WORKING) && + !(raw->flags & RAW3215_TIMER_RUNS)) { + raw->timer.expires = RAW3215_TIMEOUT + jiffies; + add_timer(&raw->timer); + raw->flags |= RAW3215_TIMER_RUNS; + } +} + +/* + * Call tty_wakeup from tasklet context + */ +static void raw3215_wakeup(unsigned long data) +{ + struct raw3215_info *raw = (struct raw3215_info *) data; + struct tty_struct *tty; + + tty = tty_port_tty_get(&raw->port); + if (tty) { + tty_wakeup(tty); + tty_kref_put(tty); + } +} + +/* + * Try to start the next IO and wake up processes waiting on the tty. + */ +static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty) +{ + raw3215_mk_write_req(raw); + raw3215_try_io(raw); + if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) + tasklet_schedule(&raw->tlet); +} + +/* + * Interrupt routine, called from common io layer + */ +static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, + struct irb *irb) +{ + struct raw3215_info *raw; + struct raw3215_req *req; + struct tty_struct *tty; + int cstat, dstat; + int count; + + raw = dev_get_drvdata(&cdev->dev); + req = (struct raw3215_req *) intparm; + tty = tty_port_tty_get(&raw->port); + cstat = irb->scsw.cmd.cstat; + dstat = irb->scsw.cmd.dstat; + if (cstat != 0) + raw3215_next_io(raw, tty); + if (dstat & 0x01) { /* we got a unit exception */ + dstat &= ~0x01; /* we can ignore it */ + } + switch (dstat) { + case 0x80: + if (cstat != 0) + break; + /* Attention interrupt, someone hit the enter key */ + raw3215_mk_read_req(raw); + raw3215_next_io(raw, tty); + break; + case 0x08: + case 0x0C: + /* Channel end interrupt. */ + if ((raw = req->info) == NULL) + goto put_tty; /* That shouldn't happen ... */ + if (req->type == RAW3215_READ) { + /* store residual count, then wait for device end */ + req->residual = irb->scsw.cmd.count; + } + if (dstat == 0x08) + break; + case 0x04: + /* Device end interrupt. */ + if ((raw = req->info) == NULL) + goto put_tty; /* That shouldn't happen ... */ + if (req->type == RAW3215_READ && tty != NULL) { + unsigned int cchar; + + count = 160 - req->residual; + EBCASC(raw->inbuf, count); + cchar = ctrlchar_handle(raw->inbuf, count, tty); + switch (cchar & CTRLCHAR_MASK) { + case CTRLCHAR_SYSRQ: + break; + + case CTRLCHAR_CTRL: + tty_insert_flip_char(&raw->port, cchar, + TTY_NORMAL); + tty_flip_buffer_push(&raw->port); + break; + + case CTRLCHAR_NONE: + if (count < 2 || + (strncmp(raw->inbuf+count-2, "\252n", 2) && + strncmp(raw->inbuf+count-2, "^n", 2)) ) { + /* add the auto \n */ + raw->inbuf[count] = '\n'; + count++; + } else + count -= 2; + tty_insert_flip_string(&raw->port, raw->inbuf, + count); + tty_flip_buffer_push(&raw->port); + break; + } + } else if (req->type == RAW3215_WRITE) { + raw->count -= req->len; + raw->written -= req->len; + } + raw->flags &= ~RAW3215_WORKING; + raw3215_free_req(req); + /* check for empty wait */ + if (waitqueue_active(&raw->empty_wait) && + raw->queued_write == NULL && + raw->queued_read == NULL) { + wake_up_interruptible(&raw->empty_wait); + } + raw3215_next_io(raw, tty); + break; + default: + /* Strange interrupt, I'll do my best to clean up */ + if (req != NULL && req->type != RAW3215_FREE) { + if (req->type == RAW3215_WRITE) { + raw->count -= req->len; + raw->written -= req->len; + } + raw->flags &= ~RAW3215_WORKING; + raw3215_free_req(req); + } + raw3215_next_io(raw, tty); + } +put_tty: + tty_kref_put(tty); +} + +/* + * Drop the oldest line from the output buffer. + */ +static void raw3215_drop_line(struct raw3215_info *raw) +{ + int ix; + char ch; + + BUG_ON(raw->written != 0); + ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); + while (raw->count > 0) { + ch = raw->buffer[ix]; + ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); + raw->count--; + if (ch == 0x15) + break; + } + raw->head = ix; +} + +/* + * Wait until length bytes are available int the output buffer. + * Has to be called with the s390irq lock held. Can be called + * disabled. + */ +static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) +{ + while (RAW3215_BUFFER_SIZE - raw->count < length) { + /* While console is frozen for suspend we have no other + * choice but to drop message from the buffer to make + * room for even more messages. */ + if (tty_port_suspended(&raw->port)) { + raw3215_drop_line(raw); + continue; + } + /* there might be a request pending */ + raw->flags |= RAW3215_FLUSHING; + raw3215_mk_write_req(raw); + raw3215_try_io(raw); + raw->flags &= ~RAW3215_FLUSHING; +#ifdef CONFIG_TN3215_CONSOLE + ccw_device_wait_idle(raw->cdev); +#endif + /* Enough room freed up ? */ + if (RAW3215_BUFFER_SIZE - raw->count >= length) + break; + /* there might be another cpu waiting for the lock */ + spin_unlock(get_ccwdev_lock(raw->cdev)); + udelay(100); + spin_lock(get_ccwdev_lock(raw->cdev)); + } +} + +/* + * String write routine for 3215 devices + */ +static void raw3215_write(struct raw3215_info *raw, const char *str, + unsigned int length) +{ + unsigned long flags; + int c, count; + + while (length > 0) { + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + count = (length > RAW3215_BUFFER_SIZE) ? + RAW3215_BUFFER_SIZE : length; + length -= count; + + raw3215_make_room(raw, count); + + /* copy string to output buffer and convert it to EBCDIC */ + while (1) { + c = min_t(int, count, + min(RAW3215_BUFFER_SIZE - raw->count, + RAW3215_BUFFER_SIZE - raw->head)); + if (c <= 0) + break; + memcpy(raw->buffer + raw->head, str, c); + ASCEBC(raw->buffer + raw->head, c); + raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); + raw->count += c; + raw->line_pos += c; + str += c; + count -= c; + } + if (!(raw->flags & RAW3215_WORKING)) { + raw3215_mk_write_req(raw); + /* start or queue request */ + raw3215_try_io(raw); + } + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); + } +} + +/* + * Put character routine for 3215 devices + */ +static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) +{ + unsigned long flags; + unsigned int length, i; + + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + if (ch == '\t') { + length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); + raw->line_pos += length; + ch = ' '; + } else if (ch == '\n') { + length = 1; + raw->line_pos = 0; + } else { + length = 1; + raw->line_pos++; + } + raw3215_make_room(raw, length); + + for (i = 0; i < length; i++) { + raw->buffer[raw->head] = (char) _ascebc[(int) ch]; + raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); + raw->count++; + } + if (!(raw->flags & RAW3215_WORKING)) { + raw3215_mk_write_req(raw); + /* start or queue request */ + raw3215_try_io(raw); + } + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); +} + +/* + * Flush routine, it simply sets the flush flag and tries to start + * pending IO. + */ +static void raw3215_flush_buffer(struct raw3215_info *raw) +{ + unsigned long flags; + + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + if (raw->count > 0) { + raw->flags |= RAW3215_FLUSHING; + raw3215_try_io(raw); + raw->flags &= ~RAW3215_FLUSHING; + } + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); +} + +/* + * Fire up a 3215 device. + */ +static int raw3215_startup(struct raw3215_info *raw) +{ + unsigned long flags; + + if (tty_port_initialized(&raw->port)) + return 0; + raw->line_pos = 0; + tty_port_set_initialized(&raw->port, 1); + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + raw3215_try_io(raw); + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); + + return 0; +} + +/* + * Shutdown a 3215 device. + */ +static void raw3215_shutdown(struct raw3215_info *raw) +{ + DECLARE_WAITQUEUE(wait, current); + unsigned long flags; + + if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED)) + return; + /* Wait for outstanding requests, then free irq */ + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + if ((raw->flags & RAW3215_WORKING) || + raw->queued_write != NULL || + raw->queued_read != NULL) { + add_wait_queue(&raw->empty_wait, &wait); + set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); + schedule(); + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + remove_wait_queue(&raw->empty_wait, &wait); + set_current_state(TASK_RUNNING); + tty_port_set_initialized(&raw->port, 1); + } + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); +} + +static struct raw3215_info *raw3215_alloc_info(void) +{ + struct raw3215_info *info; + + info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); + if (!info) + return NULL; + + info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); + info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); + if (!info->buffer || !info->inbuf) { + kfree(info->inbuf); + kfree(info->buffer); + kfree(info); + return NULL; + } + + timer_setup(&info->timer, raw3215_timeout, 0); + init_waitqueue_head(&info->empty_wait); + tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); + tty_port_init(&info->port); + + return info; +} + +static void raw3215_free_info(struct raw3215_info *raw) +{ + kfree(raw->inbuf); + kfree(raw->buffer); + tty_port_destroy(&raw->port); + kfree(raw); +} + +static int raw3215_probe (struct ccw_device *cdev) +{ + struct raw3215_info *raw; + int line; + + /* Console is special. */ + if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) + return 0; + + raw = raw3215_alloc_info(); + if (raw == NULL) + return -ENOMEM; + + raw->cdev = cdev; + dev_set_drvdata(&cdev->dev, raw); + cdev->handler = raw3215_irq; + + spin_lock(&raw3215_device_lock); + for (line = 0; line < NR_3215; line++) { + if (!raw3215[line]) { + raw3215[line] = raw; + break; + } + } + spin_unlock(&raw3215_device_lock); + if (line == NR_3215) { + raw3215_free_info(raw); + return -ENODEV; + } + + return 0; +} + +static void raw3215_remove (struct ccw_device *cdev) +{ + struct raw3215_info *raw; + unsigned int line; + + ccw_device_set_offline(cdev); + raw = dev_get_drvdata(&cdev->dev); + if (raw) { + spin_lock(&raw3215_device_lock); + for (line = 0; line < NR_3215; line++) + if (raw3215[line] == raw) + break; + raw3215[line] = NULL; + spin_unlock(&raw3215_device_lock); + dev_set_drvdata(&cdev->dev, NULL); + raw3215_free_info(raw); + } +} + +static int raw3215_set_online (struct ccw_device *cdev) +{ + struct raw3215_info *raw; + + raw = dev_get_drvdata(&cdev->dev); + if (!raw) + return -ENODEV; + + return raw3215_startup(raw); +} + +static int raw3215_set_offline (struct ccw_device *cdev) +{ + struct raw3215_info *raw; + + raw = dev_get_drvdata(&cdev->dev); + if (!raw) + return -ENODEV; + + raw3215_shutdown(raw); + + return 0; +} + +static int raw3215_pm_stop(struct ccw_device *cdev) +{ + struct raw3215_info *raw; + unsigned long flags; + + /* Empty the output buffer, then prevent new I/O. */ + raw = dev_get_drvdata(&cdev->dev); + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + raw3215_make_room(raw, RAW3215_BUFFER_SIZE); + tty_port_set_suspended(&raw->port, 1); + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); + return 0; +} + +static int raw3215_pm_start(struct ccw_device *cdev) +{ + struct raw3215_info *raw; + unsigned long flags; + + /* Allow I/O again and flush output buffer. */ + raw = dev_get_drvdata(&cdev->dev); + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + tty_port_set_suspended(&raw->port, 0); + raw->flags |= RAW3215_FLUSHING; + raw3215_try_io(raw); + raw->flags &= ~RAW3215_FLUSHING; + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); + return 0; +} + +static struct ccw_device_id raw3215_id[] = { + { CCW_DEVICE(0x3215, 0) }, + { /* end of list */ }, +}; + +static struct ccw_driver raw3215_ccw_driver = { + .driver = { + .name = "3215", + .owner = THIS_MODULE, + }, + .ids = raw3215_id, + .probe = &raw3215_probe, + .remove = &raw3215_remove, + .set_online = &raw3215_set_online, + .set_offline = &raw3215_set_offline, + .freeze = &raw3215_pm_stop, + .thaw = &raw3215_pm_start, + .restore = &raw3215_pm_start, + .int_class = IRQIO_C15, +}; + +#ifdef CONFIG_TN3215_CONSOLE +/* + * Write a string to the 3215 console + */ +static void con3215_write(struct console *co, const char *str, + unsigned int count) +{ + struct raw3215_info *raw; + int i; + + if (count <= 0) + return; + raw = raw3215[0]; /* console 3215 is the first one */ + while (count > 0) { + for (i = 0; i < count; i++) + if (str[i] == '\t' || str[i] == '\n') + break; + raw3215_write(raw, str, i); + count -= i; + str += i; + if (count > 0) { + raw3215_putchar(raw, *str); + count--; + str++; + } + } +} + +static struct tty_driver *con3215_device(struct console *c, int *index) +{ + *index = c->index; + return tty3215_driver; +} + +/* + * panic() calls con3215_flush through a panic_notifier + * before the system enters a disabled, endless loop. + */ +static void con3215_flush(void) +{ + struct raw3215_info *raw; + unsigned long flags; + + raw = raw3215[0]; /* console 3215 is the first one */ + if (tty_port_suspended(&raw->port)) + /* The console is still frozen for suspend. */ + if (ccw_device_force_console(raw->cdev)) + /* Forcing didn't work, no panic message .. */ + return; + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + raw3215_make_room(raw, RAW3215_BUFFER_SIZE); + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); +} + +static int con3215_notify(struct notifier_block *self, + unsigned long event, void *data) +{ + con3215_flush(); + return NOTIFY_OK; +} + +static struct notifier_block on_panic_nb = { + .notifier_call = con3215_notify, + .priority = 0, +}; + +static struct notifier_block on_reboot_nb = { + .notifier_call = con3215_notify, + .priority = 0, +}; + +/* + * The console structure for the 3215 console + */ +static struct console con3215 = { + .name = "ttyS", + .write = con3215_write, + .device = con3215_device, + .flags = CON_PRINTBUFFER, +}; + +/* + * 3215 console initialization code called from console_init(). + */ +static int __init con3215_init(void) +{ + struct ccw_device *cdev; + struct raw3215_info *raw; + struct raw3215_req *req; + int i; + + /* Check if 3215 is to be the console */ + if (!CONSOLE_IS_3215) + return -ENODEV; + + /* Set the console mode for VM */ + if (MACHINE_IS_VM) { + cpcmd("TERM CONMODE 3215", NULL, 0, NULL); + cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); + } + + /* allocate 3215 request structures */ + raw3215_freelist = NULL; + spin_lock_init(&raw3215_freelist_lock); + for (i = 0; i < NR_3215_REQ; i++) { + req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); + if (!req) + return -ENOMEM; + req->next = raw3215_freelist; + raw3215_freelist = req; + } + + cdev = ccw_device_create_console(&raw3215_ccw_driver); + if (IS_ERR(cdev)) + return -ENODEV; + + raw3215[0] = raw = raw3215_alloc_info(); + raw->cdev = cdev; + dev_set_drvdata(&cdev->dev, raw); + cdev->handler = raw3215_irq; + + raw->flags |= RAW3215_FIXED; + if (ccw_device_enable_console(cdev)) { + ccw_device_destroy_console(cdev); + raw3215_free_info(raw); + raw3215[0] = NULL; + return -ENODEV; + } + + /* Request the console irq */ + if (raw3215_startup(raw) != 0) { + raw3215_free_info(raw); + raw3215[0] = NULL; + return -ENODEV; + } + atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); + register_reboot_notifier(&on_reboot_nb); + register_console(&con3215); + return 0; +} +console_initcall(con3215_init); +#endif + +static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) +{ + struct raw3215_info *raw; + + raw = raw3215[tty->index]; + if (raw == NULL) + return -ENODEV; + + tty->driver_data = raw; + + return tty_port_install(&raw->port, driver, tty); +} + +/* + * tty3215_open + * + * This routine is called whenever a 3215 tty is opened. + */ +static int tty3215_open(struct tty_struct *tty, struct file * filp) +{ + struct raw3215_info *raw = tty->driver_data; + int retval; + + tty_port_tty_set(&raw->port, tty); + + raw->port.low_latency = 0; /* don't use bottom half for pushing chars */ + /* + * Start up 3215 device + */ + retval = raw3215_startup(raw); + if (retval) + return retval; + + return 0; +} + +/* + * tty3215_close() + * + * This routine is called when the 3215 tty is closed. We wait + * for the remaining request to be completed. Then we clean up. + */ +static void tty3215_close(struct tty_struct *tty, struct file * filp) +{ + struct raw3215_info *raw; + + raw = (struct raw3215_info *) tty->driver_data; + if (raw == NULL || tty->count > 1) + return; + tty->closing = 1; + /* Shutdown the terminal */ + raw3215_shutdown(raw); + tasklet_kill(&raw->tlet); + tty->closing = 0; + tty_port_tty_set(&raw->port, NULL); +} + +/* + * Returns the amount of free space in the output buffer. + */ +static int tty3215_write_room(struct tty_struct *tty) +{ + struct raw3215_info *raw; + + raw = (struct raw3215_info *) tty->driver_data; + + /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ + if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) + return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; + else + return 0; +} + +/* + * String write routine for 3215 ttys + */ +static int tty3215_write(struct tty_struct * tty, + const unsigned char *buf, int count) +{ + struct raw3215_info *raw; + int i, written; + + if (!tty) + return 0; + raw = (struct raw3215_info *) tty->driver_data; + written = count; + while (count > 0) { + for (i = 0; i < count; i++) + if (buf[i] == '\t' || buf[i] == '\n') + break; + raw3215_write(raw, buf, i); + count -= i; + buf += i; + if (count > 0) { + raw3215_putchar(raw, *buf); + count--; + buf++; + } + } + return written; +} + +/* + * Put character routine for 3215 ttys + */ +static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) +{ + struct raw3215_info *raw; + + if (!tty) + return 0; + raw = (struct raw3215_info *) tty->driver_data; + raw3215_putchar(raw, ch); + return 1; +} + +static void tty3215_flush_chars(struct tty_struct *tty) +{ +} + +/* + * Returns the number of characters in the output buffer + */ +static int tty3215_chars_in_buffer(struct tty_struct *tty) +{ + struct raw3215_info *raw; + + raw = (struct raw3215_info *) tty->driver_data; + return raw->count; +} + +static void tty3215_flush_buffer(struct tty_struct *tty) +{ + struct raw3215_info *raw; + + raw = (struct raw3215_info *) tty->driver_data; + raw3215_flush_buffer(raw); + tty_wakeup(tty); +} + +/* + * Disable reading from a 3215 tty + */ +static void tty3215_throttle(struct tty_struct * tty) +{ + struct raw3215_info *raw; + + raw = (struct raw3215_info *) tty->driver_data; + raw->flags |= RAW3215_THROTTLED; +} + +/* + * Enable reading from a 3215 tty + */ +static void tty3215_unthrottle(struct tty_struct * tty) +{ + struct raw3215_info *raw; + unsigned long flags; + + raw = (struct raw3215_info *) tty->driver_data; + if (raw->flags & RAW3215_THROTTLED) { + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + raw->flags &= ~RAW3215_THROTTLED; + raw3215_try_io(raw); + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); + } +} + +/* + * Disable writing to a 3215 tty + */ +static void tty3215_stop(struct tty_struct *tty) +{ + struct raw3215_info *raw; + + raw = (struct raw3215_info *) tty->driver_data; + raw->flags |= RAW3215_STOPPED; +} + +/* + * Enable writing to a 3215 tty + */ +static void tty3215_start(struct tty_struct *tty) +{ + struct raw3215_info *raw; + unsigned long flags; + + raw = (struct raw3215_info *) tty->driver_data; + if (raw->flags & RAW3215_STOPPED) { + spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); + raw->flags &= ~RAW3215_STOPPED; + raw3215_try_io(raw); + spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); + } +} + +static const struct tty_operations tty3215_ops = { + .install = tty3215_install, + .open = tty3215_open, + .close = tty3215_close, + .write = tty3215_write, + .put_char = tty3215_put_char, + .flush_chars = tty3215_flush_chars, + .write_room = tty3215_write_room, + .chars_in_buffer = tty3215_chars_in_buffer, + .flush_buffer = tty3215_flush_buffer, + .throttle = tty3215_throttle, + .unthrottle = tty3215_unthrottle, + .stop = tty3215_stop, + .start = tty3215_start, +}; + +/* + * 3215 tty registration code called from tty_init(). + * Most kernel services (incl. kmalloc) are available at this poimt. + */ +static int __init tty3215_init(void) +{ + struct tty_driver *driver; + int ret; + + if (!CONSOLE_IS_3215) + return 0; + + driver = alloc_tty_driver(NR_3215); + if (!driver) + return -ENOMEM; + + ret = ccw_driver_register(&raw3215_ccw_driver); + if (ret) { + put_tty_driver(driver); + return ret; + } + /* + * Initialize the tty_driver structure + * Entries in tty3215_driver that are NOT initialized: + * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc + */ + + driver->driver_name = "tty3215"; + driver->name = "ttyS"; + driver->major = TTY_MAJOR; + driver->minor_start = 64; + driver->type = TTY_DRIVER_TYPE_SYSTEM; + driver->subtype = SYSTEM_TYPE_TTY; + driver->init_termios = tty_std_termios; + driver->init_termios.c_iflag = IGNBRK | IGNPAR; + driver->init_termios.c_oflag = ONLCR; + driver->init_termios.c_lflag = ISIG; + driver->flags = TTY_DRIVER_REAL_RAW; + tty_set_operations(driver, &tty3215_ops); + ret = tty_register_driver(driver); + if (ret) { + put_tty_driver(driver); + return ret; + } + tty3215_driver = driver; + return 0; +} +device_initcall(tty3215_init); diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c new file mode 100644 index 000000000..e17364e13 --- /dev/null +++ b/drivers/s390/char/con3270.c @@ -0,0 +1,649 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * IBM/3270 Driver - console view. + * + * Author(s): + * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global) + * Rewritten for 2.5 by Martin Schwidefsky + * Copyright IBM Corp. 2003, 2009 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "raw3270.h" +#include "tty3270.h" +#include "ctrlchar.h" + +#define CON3270_OUTPUT_BUFFER_SIZE 1024 +#define CON3270_STRING_PAGES 4 + +static struct raw3270_fn con3270_fn; + +static bool auto_update = true; +module_param(auto_update, bool, 0); + +/* + * Main 3270 console view data structure. + */ +struct con3270 { + struct raw3270_view view; + struct list_head freemem; /* list of free memory for strings. */ + + /* Output stuff. */ + struct list_head lines; /* list of lines. */ + struct list_head update; /* list of lines to update. */ + int line_nr; /* line number for next update. */ + int nr_lines; /* # lines in list. */ + int nr_up; /* # lines up in history. */ + unsigned long update_flags; /* Update indication bits. */ + struct string *cline; /* current output line. */ + struct string *status; /* last line of display. */ + struct raw3270_request *write; /* single write request. */ + struct timer_list timer; + + /* Input stuff. */ + struct string *input; /* input string for read request. */ + struct raw3270_request *read; /* single read request. */ + struct raw3270_request *kreset; /* single keyboard reset request. */ + struct tasklet_struct readlet; /* tasklet to issue read request. */ +}; + +static struct con3270 *condev; + +/* con3270->update_flags. See con3270_update for details. */ +#define CON_UPDATE_ERASE 1 /* Use EWRITEA instead of WRITE. */ +#define CON_UPDATE_LIST 2 /* Update lines in tty3270->update. */ +#define CON_UPDATE_STATUS 4 /* Update status line. */ +#define CON_UPDATE_ALL 8 /* Recreate screen. */ + +static void con3270_update(struct timer_list *); + +/* + * Setup timeout for a device. On timeout trigger an update. + */ +static void con3270_set_timer(struct con3270 *cp, int expires) +{ + if (expires == 0) + del_timer(&cp->timer); + else + mod_timer(&cp->timer, jiffies + expires); +} + +/* + * The status line is the last line of the screen. It shows the string + * "console view" in the lower left corner and "Running"/"More..."/"Holding" + * in the lower right corner of the screen. + */ +static void +con3270_update_status(struct con3270 *cp) +{ + char *str; + + str = (cp->nr_up != 0) ? "History" : "Running"; + memcpy(cp->status->string + 24, str, 7); + codepage_convert(cp->view.ascebc, cp->status->string + 24, 7); + cp->update_flags |= CON_UPDATE_STATUS; +} + +static void +con3270_create_status(struct con3270 *cp) +{ + static const unsigned char blueprint[] = + { TO_SBA, 0, 0, TO_SF,TF_LOG,TO_SA,TAT_COLOR, TAC_GREEN, + 'c','o','n','s','o','l','e',' ','v','i','e','w', + TO_RA,0,0,0,'R','u','n','n','i','n','g',TO_SF,TF_LOG }; + + cp->status = alloc_string(&cp->freemem, sizeof(blueprint)); + /* Copy blueprint to status line */ + memcpy(cp->status->string, blueprint, sizeof(blueprint)); + /* Set TO_RA addresses. */ + raw3270_buffer_address(cp->view.dev, cp->status->string + 1, + cp->view.cols * (cp->view.rows - 1)); + raw3270_buffer_address(cp->view.dev, cp->status->string + 21, + cp->view.cols * cp->view.rows - 8); + /* Convert strings to ebcdic. */ + codepage_convert(cp->view.ascebc, cp->status->string + 8, 12); + codepage_convert(cp->view.ascebc, cp->status->string + 24, 7); +} + +/* + * Set output offsets to 3270 datastream fragment of a console string. + */ +static void +con3270_update_string(struct con3270 *cp, struct string *s, int nr) +{ + if (s->len < 4) { + /* This indicates a bug, but printing a warning would + * cause a deadlock. */ + return; + } + if (s->string[s->len - 4] != TO_RA) + return; + raw3270_buffer_address(cp->view.dev, s->string + s->len - 3, + cp->view.cols * (nr + 1)); +} + +/* + * Rebuild update list to print all lines. + */ +static void +con3270_rebuild_update(struct con3270 *cp) +{ + struct string *s, *n; + int nr; + + /* + * Throw away update list and create a new one, + * containing all lines that will fit on the screen. + */ + list_for_each_entry_safe(s, n, &cp->update, update) + list_del_init(&s->update); + nr = cp->view.rows - 2 + cp->nr_up; + list_for_each_entry_reverse(s, &cp->lines, list) { + if (nr < cp->view.rows - 1) + list_add(&s->update, &cp->update); + if (--nr < 0) + break; + } + cp->line_nr = 0; + cp->update_flags |= CON_UPDATE_LIST; +} + +/* + * Alloc string for size bytes. Free strings from history if necessary. + */ +static struct string * +con3270_alloc_string(struct con3270 *cp, size_t size) +{ + struct string *s, *n; + + s = alloc_string(&cp->freemem, size); + if (s) + return s; + list_for_each_entry_safe(s, n, &cp->lines, list) { + list_del(&s->list); + if (!list_empty(&s->update)) + list_del(&s->update); + cp->nr_lines--; + if (free_string(&cp->freemem, s) >= size) + break; + } + s = alloc_string(&cp->freemem, size); + BUG_ON(!s); + if (cp->nr_up != 0 && cp->nr_up + cp->view.rows > cp->nr_lines) { + cp->nr_up = cp->nr_lines - cp->view.rows + 1; + con3270_rebuild_update(cp); + con3270_update_status(cp); + } + return s; +} + +/* + * Write completion callback. + */ +static void +con3270_write_callback(struct raw3270_request *rq, void *data) +{ + raw3270_request_reset(rq); + xchg(&((struct con3270 *) rq->view)->write, rq); +} + +/* + * Update console display. + */ +static void +con3270_update(struct timer_list *t) +{ + struct con3270 *cp = from_timer(cp, t, timer); + struct raw3270_request *wrq; + char wcc, prolog[6]; + unsigned long flags; + unsigned long updated; + struct string *s, *n; + int rc; + + if (!auto_update && !raw3270_view_active(&cp->view)) + return; + if (cp->view.dev) + raw3270_activate_view(&cp->view); + + wrq = xchg(&cp->write, 0); + if (!wrq) { + con3270_set_timer(cp, 1); + return; + } + + spin_lock_irqsave(&cp->view.lock, flags); + updated = 0; + if (cp->update_flags & CON_UPDATE_ALL) { + con3270_rebuild_update(cp); + con3270_update_status(cp); + cp->update_flags = CON_UPDATE_ERASE | CON_UPDATE_LIST | + CON_UPDATE_STATUS; + } + if (cp->update_flags & CON_UPDATE_ERASE) { + /* Use erase write alternate to initialize display. */ + raw3270_request_set_cmd(wrq, TC_EWRITEA); + updated |= CON_UPDATE_ERASE; + } else + raw3270_request_set_cmd(wrq, TC_WRITE); + + wcc = TW_NONE; + raw3270_request_add_data(wrq, &wcc, 1); + + /* + * Update status line. + */ + if (cp->update_flags & CON_UPDATE_STATUS) + if (raw3270_request_add_data(wrq, cp->status->string, + cp->status->len) == 0) + updated |= CON_UPDATE_STATUS; + + if (cp->update_flags & CON_UPDATE_LIST) { + prolog[0] = TO_SBA; + prolog[3] = TO_SA; + prolog[4] = TAT_COLOR; + prolog[5] = TAC_TURQ; + raw3270_buffer_address(cp->view.dev, prolog + 1, + cp->view.cols * cp->line_nr); + raw3270_request_add_data(wrq, prolog, 6); + /* Write strings in the update list to the screen. */ + list_for_each_entry_safe(s, n, &cp->update, update) { + if (s != cp->cline) + con3270_update_string(cp, s, cp->line_nr); + if (raw3270_request_add_data(wrq, s->string, + s->len) != 0) + break; + list_del_init(&s->update); + if (s != cp->cline) + cp->line_nr++; + } + if (list_empty(&cp->update)) + updated |= CON_UPDATE_LIST; + } + wrq->callback = con3270_write_callback; + rc = raw3270_start(&cp->view, wrq); + if (rc == 0) { + cp->update_flags &= ~updated; + if (cp->update_flags) + con3270_set_timer(cp, 1); + } else { + raw3270_request_reset(wrq); + xchg(&cp->write, wrq); + } + spin_unlock_irqrestore(&cp->view.lock, flags); +} + +/* + * Read tasklet. + */ +static void +con3270_read_tasklet(struct raw3270_request *rrq) +{ + static char kreset_data = TW_KR; + struct con3270 *cp; + unsigned long flags; + int nr_up, deactivate; + + cp = (struct con3270 *) rrq->view; + spin_lock_irqsave(&cp->view.lock, flags); + nr_up = cp->nr_up; + deactivate = 0; + /* Check aid byte. */ + switch (cp->input->string[0]) { + case 0x7d: /* enter: jump to bottom. */ + nr_up = 0; + break; + case 0xf3: /* PF3: deactivate the console view. */ + deactivate = 1; + break; + case 0x6d: /* clear: start from scratch. */ + cp->update_flags = CON_UPDATE_ALL; + con3270_set_timer(cp, 1); + break; + case 0xf7: /* PF7: do a page up in the console log. */ + nr_up += cp->view.rows - 2; + if (nr_up + cp->view.rows - 1 > cp->nr_lines) { + nr_up = cp->nr_lines - cp->view.rows + 1; + if (nr_up < 0) + nr_up = 0; + } + break; + case 0xf8: /* PF8: do a page down in the console log. */ + nr_up -= cp->view.rows - 2; + if (nr_up < 0) + nr_up = 0; + break; + } + if (nr_up != cp->nr_up) { + cp->nr_up = nr_up; + con3270_rebuild_update(cp); + con3270_update_status(cp); + con3270_set_timer(cp, 1); + } + spin_unlock_irqrestore(&cp->view.lock, flags); + + /* Start keyboard reset command. */ + raw3270_request_reset(cp->kreset); + raw3270_request_set_cmd(cp->kreset, TC_WRITE); + raw3270_request_add_data(cp->kreset, &kreset_data, 1); + raw3270_start(&cp->view, cp->kreset); + + if (deactivate) + raw3270_deactivate_view(&cp->view); + + raw3270_request_reset(rrq); + xchg(&cp->read, rrq); + raw3270_put_view(&cp->view); +} + +/* + * Read request completion callback. + */ +static void +con3270_read_callback(struct raw3270_request *rq, void *data) +{ + raw3270_get_view(rq->view); + /* Schedule tasklet to pass input to tty. */ + tasklet_schedule(&((struct con3270 *) rq->view)->readlet); +} + +/* + * Issue a read request. Called only from interrupt function. + */ +static void +con3270_issue_read(struct con3270 *cp) +{ + struct raw3270_request *rrq; + int rc; + + rrq = xchg(&cp->read, 0); + if (!rrq) + /* Read already scheduled. */ + return; + rrq->callback = con3270_read_callback; + rrq->callback_data = cp; + raw3270_request_set_cmd(rrq, TC_READMOD); + raw3270_request_set_data(rrq, cp->input->string, cp->input->len); + /* Issue the read modified request. */ + rc = raw3270_start_irq(&cp->view, rrq); + if (rc) + raw3270_request_reset(rrq); +} + +/* + * Switch to the console view. + */ +static int +con3270_activate(struct raw3270_view *view) +{ + struct con3270 *cp; + + cp = (struct con3270 *) view; + cp->update_flags = CON_UPDATE_ALL; + con3270_set_timer(cp, 1); + return 0; +} + +static void +con3270_deactivate(struct raw3270_view *view) +{ + struct con3270 *cp; + + cp = (struct con3270 *) view; + del_timer(&cp->timer); +} + +static void +con3270_irq(struct con3270 *cp, struct raw3270_request *rq, struct irb *irb) +{ + /* Handle ATTN. Schedule tasklet to read aid. */ + if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) + con3270_issue_read(cp); + + if (rq) { + if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) + rq->rc = -EIO; + else + /* Normal end. Copy residual count. */ + rq->rescnt = irb->scsw.cmd.count; + } else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) { + /* Interrupt without an outstanding request -> update all */ + cp->update_flags = CON_UPDATE_ALL; + con3270_set_timer(cp, 1); + } +} + +/* Console view to a 3270 device. */ +static struct raw3270_fn con3270_fn = { + .activate = con3270_activate, + .deactivate = con3270_deactivate, + .intv = (void *) con3270_irq +}; + +static inline void +con3270_cline_add(struct con3270 *cp) +{ + if (!list_empty(&cp->cline->list)) + /* Already added. */ + return; + list_add_tail(&cp->cline->list, &cp->lines); + cp->nr_lines++; + con3270_rebuild_update(cp); +} + +static inline void +con3270_cline_insert(struct con3270 *cp, unsigned char c) +{ + cp->cline->string[cp->cline->len++] = + cp->view.ascebc[(c < ' ') ? ' ' : c]; + if (list_empty(&cp->cline->update)) { + list_add_tail(&cp->cline->update, &cp->update); + cp->update_flags |= CON_UPDATE_LIST; + } +} + +static inline void +con3270_cline_end(struct con3270 *cp) +{ + struct string *s; + unsigned int size; + + /* Copy cline. */ + size = (cp->cline->len < cp->view.cols - 5) ? + cp->cline->len + 4 : cp->view.cols; + s = con3270_alloc_string(cp, size); + memcpy(s->string, cp->cline->string, cp->cline->len); + if (cp->cline->len < cp->view.cols - 5) { + s->string[s->len - 4] = TO_RA; + s->string[s->len - 1] = 0; + } else { + while (--size >= cp->cline->len) + s->string[size] = cp->view.ascebc[' ']; + } + /* Replace cline with allocated line s and reset cline. */ + list_add(&s->list, &cp->cline->list); + list_del_init(&cp->cline->list); + if (!list_empty(&cp->cline->update)) { + list_add(&s->update, &cp->cline->update); + list_del_init(&cp->cline->update); + } + cp->cline->len = 0; +} + +/* + * Write a string to the 3270 console + */ +static void +con3270_write(struct console *co, const char *str, unsigned int count) +{ + struct con3270 *cp; + unsigned long flags; + unsigned char c; + + cp = condev; + spin_lock_irqsave(&cp->view.lock, flags); + while (count-- > 0) { + c = *str++; + if (cp->cline->len == 0) + con3270_cline_add(cp); + if (c != '\n') + con3270_cline_insert(cp, c); + if (c == '\n' || cp->cline->len >= cp->view.cols) + con3270_cline_end(cp); + } + /* Setup timer to output current console buffer after 1/10 second */ + cp->nr_up = 0; + if (cp->view.dev && !timer_pending(&cp->timer)) + con3270_set_timer(cp, HZ/10); + spin_unlock_irqrestore(&cp->view.lock,flags); +} + +static struct tty_driver * +con3270_device(struct console *c, int *index) +{ + *index = c->index; + return tty3270_driver; +} + +/* + * Wait for end of write request. + */ +static void +con3270_wait_write(struct con3270 *cp) +{ + while (!cp->write) { + raw3270_wait_cons_dev(cp->view.dev); + barrier(); + } +} + +/* + * panic() calls con3270_flush through a panic_notifier + * before the system enters a disabled, endless loop. + */ +static void +con3270_flush(void) +{ + struct con3270 *cp; + unsigned long flags; + + cp = condev; + if (!cp->view.dev) + return; + raw3270_pm_unfreeze(&cp->view); + raw3270_activate_view(&cp->view); + spin_lock_irqsave(&cp->view.lock, flags); + con3270_wait_write(cp); + cp->nr_up = 0; + con3270_rebuild_update(cp); + con3270_update_status(cp); + while (cp->update_flags != 0) { + spin_unlock_irqrestore(&cp->view.lock, flags); + con3270_update(&cp->timer); + spin_lock_irqsave(&cp->view.lock, flags); + con3270_wait_write(cp); + } + spin_unlock_irqrestore(&cp->view.lock, flags); +} + +static int con3270_notify(struct notifier_block *self, + unsigned long event, void *data) +{ + con3270_flush(); + return NOTIFY_OK; +} + +static struct notifier_block on_panic_nb = { + .notifier_call = con3270_notify, + .priority = 0, +}; + +static struct notifier_block on_reboot_nb = { + .notifier_call = con3270_notify, + .priority = 0, +}; + +/* + * The console structure for the 3270 console + */ +static struct console con3270 = { + .name = "tty3270", + .write = con3270_write, + .device = con3270_device, + .flags = CON_PRINTBUFFER, +}; + +/* + * 3270 console initialization code called from console_init(). + */ +static int __init +con3270_init(void) +{ + struct raw3270 *rp; + void *cbuf; + int i; + + /* Check if 3270 is to be the console */ + if (!CONSOLE_IS_3270) + return -ENODEV; + + /* Set the console mode for VM */ + if (MACHINE_IS_VM) { + cpcmd("TERM CONMODE 3270", NULL, 0, NULL); + cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); + } + + rp = raw3270_setup_console(); + if (IS_ERR(rp)) + return PTR_ERR(rp); + + condev = kzalloc(sizeof(struct con3270), GFP_KERNEL | GFP_DMA); + if (!condev) + return -ENOMEM; + condev->view.dev = rp; + + condev->read = raw3270_request_alloc(0); + condev->read->callback = con3270_read_callback; + condev->read->callback_data = condev; + condev->write = raw3270_request_alloc(CON3270_OUTPUT_BUFFER_SIZE); + condev->kreset = raw3270_request_alloc(1); + + INIT_LIST_HEAD(&condev->lines); + INIT_LIST_HEAD(&condev->update); + timer_setup(&condev->timer, con3270_update, 0); + tasklet_init(&condev->readlet, + (void (*)(unsigned long)) con3270_read_tasklet, + (unsigned long) condev->read); + + raw3270_add_view(&condev->view, &con3270_fn, 1, RAW3270_VIEW_LOCK_IRQ); + + INIT_LIST_HEAD(&condev->freemem); + for (i = 0; i < CON3270_STRING_PAGES; i++) { + cbuf = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + add_string_memory(&condev->freemem, cbuf, PAGE_SIZE); + } + condev->cline = alloc_string(&condev->freemem, condev->view.cols); + condev->cline->len = 0; + con3270_create_status(condev); + condev->input = alloc_string(&condev->freemem, 80); + atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); + register_reboot_notifier(&on_reboot_nb); + register_console(&con3270); + return 0; +} + +console_initcall(con3270_init); diff --git a/drivers/s390/char/ctrlchar.c b/drivers/s390/char/ctrlchar.c new file mode 100644 index 000000000..e1686a69a --- /dev/null +++ b/drivers/s390/char/ctrlchar.c @@ -0,0 +1,79 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Unified handling of special chars. + * + * Copyright IBM Corp. 2001 + * Author(s): Fritz Elfert + * + */ + +#include +#include +#include +#include + +#include "ctrlchar.h" + +#ifdef CONFIG_MAGIC_SYSRQ +static struct sysrq_work ctrlchar_sysrq; + +static void +ctrlchar_handle_sysrq(struct work_struct *work) +{ + struct sysrq_work *sysrq = container_of(work, struct sysrq_work, work); + + handle_sysrq(sysrq->key); +} + +void schedule_sysrq_work(struct sysrq_work *sw) +{ + INIT_WORK(&sw->work, ctrlchar_handle_sysrq); + schedule_work(&sw->work); +} +#endif + + +/** + * Check for special chars at start of input. + * + * @param buf Console input buffer. + * @param len Length of valid data in buffer. + * @param tty The tty struct for this console. + * @return CTRLCHAR_NONE, if nothing matched, + * CTRLCHAR_SYSRQ, if sysrq was encountered + * otherwise char to be inserted logically or'ed + * with CTRLCHAR_CTRL + */ +unsigned int +ctrlchar_handle(const unsigned char *buf, int len, struct tty_struct *tty) +{ + if ((len < 2) || (len > 3)) + return CTRLCHAR_NONE; + + /* hat is 0xb1 in codepage 037 (US etc.) and thus */ + /* converted to 0x5e in ascii ('^') */ + if ((buf[0] != '^') && (buf[0] != '\252')) + return CTRLCHAR_NONE; + +#ifdef CONFIG_MAGIC_SYSRQ + /* racy */ + if (len == 3 && buf[1] == '-') { + ctrlchar_sysrq.key = buf[2]; + schedule_sysrq_work(&ctrlchar_sysrq); + return CTRLCHAR_SYSRQ; + } +#endif + + if (len != 2) + return CTRLCHAR_NONE; + + switch (tolower(buf[1])) { + case 'c': + return INTR_CHAR(tty) | CTRLCHAR_CTRL; + case 'd': + return EOF_CHAR(tty) | CTRLCHAR_CTRL; + case 'z': + return SUSP_CHAR(tty) | CTRLCHAR_CTRL; + } + return CTRLCHAR_NONE; +} diff --git a/drivers/s390/char/ctrlchar.h b/drivers/s390/char/ctrlchar.h new file mode 100644 index 000000000..e52afa3b8 --- /dev/null +++ b/drivers/s390/char/ctrlchar.h @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Unified handling of special chars. + * + * Copyright IBM Corp. 2001 + * Author(s): Fritz Elfert + * + */ + +#include +#include +#include + +extern unsigned int +ctrlchar_handle(const unsigned char *buf, int len, struct tty_struct *tty); + + +#define CTRLCHAR_NONE (1 << 8) +#define CTRLCHAR_CTRL (2 << 8) +#define CTRLCHAR_SYSRQ (3 << 8) + +#define CTRLCHAR_MASK (~0xffu) + + +#ifdef CONFIG_MAGIC_SYSRQ +struct sysrq_work { + int key; + struct work_struct work; +}; + +void schedule_sysrq_work(struct sysrq_work *sw); +#endif diff --git a/drivers/s390/char/defkeymap.c b/drivers/s390/char/defkeymap.c new file mode 100644 index 000000000..60845d467 --- /dev/null +++ b/drivers/s390/char/defkeymap.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* Do not edit this file! It was automatically generated by */ +/* loadkeys --mktable defkeymap.map > defkeymap.c */ + +#include +#include +#include +#include +#include + +#include "keyboard.h" + +u_short ebc_plain_map[NR_KEYS] = { + 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, + 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, + 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, + 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, + 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, + 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, + 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, + 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, 0xf000, + 0xf020, 0xf000, 0xf0e2, 0xf0e4, 0xf0e0, 0xf0e1, 0xf0e3, 0xf0e5, + 0xf0e7, 0xf0f1, 0xf0a2, 0xf02e, 0xf03c, 0xf028, 0xf02b, 0xf07c, + 0xf026, 0xf0e9, 0xf0e2, 0xf0eb, 0xf0e8, 0xf0ed, 0xf0ee, 0xf0ef, + 0xf0ec, 0xf0df, 0xf021, 0xf024, 0xf02a, 0xf029, 0xf03b, 0xf0ac, + 0xf02d, 0xf02f, 0xf0c2, 0xf0c4, 0xf0c0, 0xf0c1, 0xf0c3, 0xf0c5, + 0xf0c7, 0xf0d1, 0xf0a6, 0xf02c, 0xf025, 0xf05f, 0xf03e, 0xf03f, + 0xf0f8, 0xf0c9, 0xf0ca, 0xf0cb, 0xf0c8, 0xf0cd, 0xf0ce, 0xf0cf, + 0xf0cc, 0xf060, 0xf03a, 0xf023, 0xf040, 0xf027, 0xf03d, 0xf022, +}; + +static u_short shift_map[NR_KEYS] = { + 0xf0d8, 0xf061, 0xf062, 0xf063, 0xf064, 0xf065, 0xf066, 0xf067, + 0xf068, 0xf069, 0xf0ab, 0xf0bb, 0xf0f0, 0xf0fd, 0xf0fe, 0xf0b1, + 0xf0b0, 0xf06a, 0xf06b, 0xf06c, 0xf06d, 0xf06e, 0xf06f, 0xf070, + 0xf071, 0xf072, 0xf000, 0xf000, 0xf0e6, 0xf0b8, 0xf0c6, 0xf0a4, + 0xf0b5, 0xf07e, 0xf073, 0xf074, 0xf075, 0xf076, 0xf077, 0xf078, + 0xf079, 0xf07a, 0xf0a1, 0xf0bf, 0xf0d0, 0xf0dd, 0xf0de, 0xf0ae, + 0xf402, 0xf0a3, 0xf0a5, 0xf0b7, 0xf0a9, 0xf0a7, 0xf0b6, 0xf0bc, + 0xf0bd, 0xf0be, 0xf05b, 0xf05d, 0xf000, 0xf0a8, 0xf0b4, 0xf0d7, + 0xf07b, 0xf041, 0xf042, 0xf043, 0xf044, 0xf045, 0xf046, 0xf047, + 0xf048, 0xf049, 0xf000, 0xf0f4, 0xf0f6, 0xf0f2, 0xf0f3, 0xf0f5, + 0xf07d, 0xf04a, 0xf04b, 0xf04c, 0xf04d, 0xf04e, 0xf04f, 0xf050, + 0xf051, 0xf052, 0xf0b9, 0xf0fb, 0xf0fc, 0xf0f9, 0xf0fa, 0xf0ff, + 0xf05c, 0xf0f7, 0xf053, 0xf054, 0xf055, 0xf056, 0xf057, 0xf058, + 0xf059, 0xf05a, 0xf0b2, 0xf0d4, 0xf0d6, 0xf0d2, 0xf0d3, 0xf0d5, + 0xf030, 0xf031, 0xf032, 0xf033, 0xf034, 0xf035, 0xf036, 0xf037, + 0xf038, 0xf039, 0xf0b3, 0xf0db, 0xf0dc, 0xf0d9, 0xf0da, 0xf000, +}; + +static u_short ctrl_map[NR_KEYS] = { + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf11f, 0xf120, 0xf121, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf01a, 0xf003, 0xf212, 0xf004, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf109, 0xf10a, 0xf206, 0xf00a, 0xf200, 0xf200, +}; + +static u_short shift_ctrl_map[NR_KEYS] = { + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf10c, 0xf10d, 0xf10e, 0xf10f, 0xf110, 0xf111, 0xf112, + 0xf113, 0xf11e, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, + 0xf200, 0xf100, 0xf101, 0xf211, 0xf103, 0xf104, 0xf105, 0xf20b, + 0xf20a, 0xf108, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, +}; + +ushort *ebc_key_maps[MAX_NR_KEYMAPS] = { + ebc_plain_map, shift_map, NULL, NULL, + ctrl_map, shift_ctrl_map, NULL, +}; + +unsigned int ebc_keymap_count = 4; + + +/* + * Philosophy: most people do not define more strings, but they who do + * often want quite a lot of string space. So, we statically allocate + * the default and allocate dynamically in chunks of 512 bytes. + */ + +char ebc_func_buf[] = { + '\033', '[', '[', 'A', 0, + '\033', '[', '[', 'B', 0, + '\033', '[', '[', 'C', 0, + '\033', '[', '[', 'D', 0, + '\033', '[', '[', 'E', 0, + '\033', '[', '1', '7', '~', 0, + '\033', '[', '1', '8', '~', 0, + '\033', '[', '1', '9', '~', 0, + '\033', '[', '2', '0', '~', 0, + '\033', '[', '2', '1', '~', 0, + '\033', '[', '2', '3', '~', 0, + '\033', '[', '2', '4', '~', 0, + '\033', '[', '2', '5', '~', 0, + '\033', '[', '2', '6', '~', 0, + '\033', '[', '2', '8', '~', 0, + '\033', '[', '2', '9', '~', 0, + '\033', '[', '3', '1', '~', 0, + '\033', '[', '3', '2', '~', 0, + '\033', '[', '3', '3', '~', 0, + '\033', '[', '3', '4', '~', 0, +}; + + +char *ebc_funcbufptr = ebc_func_buf; +int ebc_funcbufsize = sizeof(ebc_func_buf); +int ebc_funcbufleft; /* space left */ + +char *ebc_func_table[MAX_NR_FUNC] = { + ebc_func_buf + 0, + ebc_func_buf + 5, + ebc_func_buf + 10, + ebc_func_buf + 15, + ebc_func_buf + 20, + ebc_func_buf + 25, + ebc_func_buf + 31, + ebc_func_buf + 37, + ebc_func_buf + 43, + ebc_func_buf + 49, + ebc_func_buf + 55, + ebc_func_buf + 61, + ebc_func_buf + 67, + ebc_func_buf + 73, + ebc_func_buf + 79, + ebc_func_buf + 85, + ebc_func_buf + 91, + ebc_func_buf + 97, + ebc_func_buf + 103, + ebc_func_buf + 109, + NULL, +}; + +struct kbdiacruc ebc_accent_table[MAX_DIACR] = { + {'^', 'c', 0003}, {'^', 'd', 0004}, + {'^', 'z', 0032}, {'^', 0012, 0000}, +}; + +unsigned int ebc_accent_table_size = 4; diff --git a/drivers/s390/char/defkeymap.map b/drivers/s390/char/defkeymap.map new file mode 100644 index 000000000..f4c095612 --- /dev/null +++ b/drivers/s390/char/defkeymap.map @@ -0,0 +1,192 @@ +# SPDX-License-Identifier: GPL-2.0 +# Default keymap for 3270 (ebcdic codepage 037). +keymaps 0-1,4-5 + +keycode 0 = nul Oslash +keycode 1 = nul a +keycode 2 = nul b +keycode 3 = nul c +keycode 4 = nul d +keycode 5 = nul e +keycode 6 = nul f +keycode 7 = nul g +keycode 8 = nul h +keycode 9 = nul i +keycode 10 = nul guillemotleft +keycode 11 = nul guillemotright +keycode 12 = nul eth +keycode 13 = nul yacute +keycode 14 = nul thorn +keycode 15 = nul plusminus +keycode 16 = nul degree +keycode 17 = nul j +keycode 18 = nul k +keycode 19 = nul l +keycode 20 = nul m +keycode 21 = nul n +keycode 22 = nul o +keycode 23 = nul p +keycode 24 = nul q +keycode 25 = nul r +keycode 26 = nul nul +keycode 27 = nul nul +keycode 28 = nul ae +keycode 29 = nul cedilla +keycode 30 = nul AE +keycode 31 = nul currency +keycode 32 = nul mu +keycode 33 = nul tilde +keycode 34 = nul s +keycode 35 = nul t +keycode 36 = nul u +keycode 37 = nul v +keycode 38 = nul w +keycode 39 = nul x +keycode 40 = nul y +keycode 41 = nul z +keycode 42 = nul exclamdown +keycode 43 = nul questiondown +keycode 44 = nul ETH +keycode 45 = nul Yacute +keycode 46 = nul THORN +keycode 47 = nul registered +keycode 48 = nul dead_circumflex +keycode 49 = nul sterling +keycode 50 = nul yen +keycode 51 = nul periodcentered +keycode 52 = nul copyright +keycode 53 = nul section +keycode 54 = nul paragraph +keycode 55 = nul onequarter +keycode 56 = nul onehalf +keycode 57 = nul threequarters +keycode 58 = nul bracketleft +keycode 59 = nul bracketright +keycode 60 = nul nul +keycode 61 = nul diaeresis +keycode 62 = nul acute +keycode 63 = nul multiply +keycode 64 = space braceleft +keycode 65 = nul A +keycode 66 = acircumflex B +keycode 67 = adiaeresis C +keycode 68 = agrave D +keycode 69 = aacute E +keycode 70 = atilde F +keycode 71 = aring G +keycode 72 = ccedilla H +keycode 73 = ntilde I +keycode 74 = cent nul +keycode 75 = period ocircumflex +keycode 76 = less odiaeresis +keycode 77 = parenleft ograve +keycode 78 = plus oacute +keycode 79 = bar otilde +keycode 80 = ampersand braceright +keycode 81 = eacute J +keycode 82 = acircumflex K +keycode 83 = ediaeresis L +keycode 84 = egrave M +keycode 85 = iacute N +keycode 86 = icircumflex O +keycode 87 = idiaeresis P +keycode 88 = igrave Q +keycode 89 = ssharp R +keycode 90 = exclam onesuperior +keycode 91 = dollar ucircumflex +keycode 92 = asterisk udiaeresis +keycode 93 = parenright ugrave +keycode 94 = semicolon uacute +keycode 95 = notsign ydiaeresis +keycode 96 = minus backslash +keycode 97 = slash division +keycode 98 = Acircumflex S +keycode 99 = Adiaeresis T +keycode 100 = Agrave U +keycode 101 = Aacute V +keycode 102 = Atilde W +keycode 103 = Aring X +keycode 104 = Ccedilla Y +keycode 105 = Ntilde Z +keycode 106 = brokenbar twosuperior +keycode 107 = comma Ocircumflex +keycode 108 = percent Odiaeresis +keycode 109 = underscore Ograve +keycode 110 = greater Oacute +keycode 111 = question Otilde +keycode 112 = oslash zero +keycode 113 = Eacute one +keycode 114 = Ecircumflex two +keycode 115 = Ediaeresis three +keycode 116 = Egrave four +keycode 117 = Iacute five +keycode 118 = Icircumflex six +keycode 119 = Idiaeresis seven +keycode 120 = Igrave eight +keycode 121 = grave nine +keycode 122 = colon threesuperior +keycode 123 = numbersign Ucircumflex +keycode 124 = at Udiaeresis +keycode 125 = apostrophe Ugrave +keycode 126 = equal Uacute +keycode 127 = quotedbl nul + +# AID keys +control keycode 74 = F22 +control keycode 75 = F23 +control keycode 76 = F24 +control keycode 107 = Control_z # PA3 +control keycode 108 = Control_c # PA1 +control keycode 109 = KeyboardSignal # Clear +control keycode 110 = Control_d # PA2 +control keycode 122 = F10 +control keycode 123 = F11 # F11 +control keycode 124 = Last_Console # F12 +control keycode 125 = Linefeed +shift control keycode 65 = F13 +shift control keycode 66 = F14 +shift control keycode 67 = F15 +shift control keycode 68 = F16 +shift control keycode 69 = F17 +shift control keycode 70 = F18 +shift control keycode 71 = F19 +shift control keycode 72 = F20 +shift control keycode 73 = F21 +shift control keycode 113 = F1 +shift control keycode 114 = F2 +shift control keycode 115 = Incr_Console +shift control keycode 116 = F4 +shift control keycode 117 = F5 +shift control keycode 118 = F6 +shift control keycode 119 = Scroll_Backward +shift control keycode 120 = Scroll_Forward +shift control keycode 121 = F9 + +string F1 = "\033[[A" +string F2 = "\033[[B" +string F3 = "\033[[C" +string F4 = "\033[[D" +string F5 = "\033[[E" +string F6 = "\033[17~" +string F7 = "\033[18~" +string F8 = "\033[19~" +string F9 = "\033[20~" +string F10 = "\033[21~" +string F11 = "\033[23~" +string F12 = "\033[24~" +string F13 = "\033[25~" +string F14 = "\033[26~" +string F15 = "\033[28~" +string F16 = "\033[29~" +string F17 = "\033[31~" +string F18 = "\033[32~" +string F19 = "\033[33~" +string F20 = "\033[34~" +# string F21 ?? +# string F22 ?? +# string F23 ?? +# string F24 ?? +compose '^' 'c' to Control_c +compose '^' 'd' to Control_d +compose '^' 'z' to Control_z +compose '^' '\012' to nul diff --git a/drivers/s390/char/diag_ftp.c b/drivers/s390/char/diag_ftp.c new file mode 100644 index 000000000..6bf1058de --- /dev/null +++ b/drivers/s390/char/diag_ftp.c @@ -0,0 +1,240 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DIAGNOSE X'2C4' instruction based HMC FTP services, useable on z/VM + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + * + */ + +#define KMSG_COMPONENT "hmcdrv" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include + +#include "hmcdrv_ftp.h" +#include "diag_ftp.h" + +/* DIAGNOSE X'2C4' return codes in Ry */ +#define DIAG_FTP_RET_OK 0 /* HMC FTP started successfully */ +#define DIAG_FTP_RET_EBUSY 4 /* HMC FTP service currently busy */ +#define DIAG_FTP_RET_EIO 8 /* HMC FTP service I/O error */ +/* and an artificial extension */ +#define DIAG_FTP_RET_EPERM 2 /* HMC FTP service privilege error */ + +/* FTP service status codes (after INTR at guest real location 133) */ +#define DIAG_FTP_STAT_OK 0U /* request completed successfully */ +#define DIAG_FTP_STAT_PGCC 4U /* program check condition */ +#define DIAG_FTP_STAT_PGIOE 8U /* paging I/O error */ +#define DIAG_FTP_STAT_TIMEOUT 12U /* timeout */ +#define DIAG_FTP_STAT_EBASE 16U /* base of error codes from SCLP */ +#define DIAG_FTP_STAT_LDFAIL (DIAG_FTP_STAT_EBASE + 1U) /* failed */ +#define DIAG_FTP_STAT_LDNPERM (DIAG_FTP_STAT_EBASE + 2U) /* not allowed */ +#define DIAG_FTP_STAT_LDRUNS (DIAG_FTP_STAT_EBASE + 3U) /* runs */ +#define DIAG_FTP_STAT_LDNRUNS (DIAG_FTP_STAT_EBASE + 4U) /* not runs */ + +/** + * struct diag_ftp_ldfpl - load file FTP parameter list (LDFPL) + * @bufaddr: real buffer address (at 4k boundary) + * @buflen: length of buffer + * @offset: dir/file offset + * @intparm: interruption parameter (unused) + * @transferred: bytes transferred + * @fsize: file size, filled on GET + * @failaddr: failing address + * @spare: padding + * @fident: file name - ASCII + */ +struct diag_ftp_ldfpl { + u64 bufaddr; + u64 buflen; + u64 offset; + u64 intparm; + u64 transferred; + u64 fsize; + u64 failaddr; + u64 spare; + u8 fident[HMCDRV_FTP_FIDENT_MAX]; +} __packed; + +static DECLARE_COMPLETION(diag_ftp_rx_complete); +static int diag_ftp_subcode; + +/** + * diag_ftp_handler() - FTP services IRQ handler + * @extirq: external interrupt (sub-) code + * @param32: 32-bit interruption parameter from &struct diag_ftp_ldfpl + * @param64: unused (for 64-bit interrupt parameters) + */ +static void diag_ftp_handler(struct ext_code extirq, + unsigned int param32, + unsigned long param64) +{ + if ((extirq.subcode >> 8) != 8) + return; /* not a FTP services sub-code */ + + inc_irq_stat(IRQEXT_FTP); + diag_ftp_subcode = extirq.subcode & 0xffU; + complete(&diag_ftp_rx_complete); +} + +/** + * diag_ftp_2c4() - DIAGNOSE X'2C4' service call + * @fpl: pointer to prepared LDFPL + * @cmd: FTP command to be executed + * + * Performs a DIAGNOSE X'2C4' call with (input/output) FTP parameter list + * @fpl and FTP function code @cmd. In case of an error the function does + * nothing and returns an (negative) error code. + * + * Notes: + * 1. This function only initiates a transfer, so the caller must wait + * for completion (asynchronous execution). + * 2. The FTP parameter list @fpl must be aligned to a double-word boundary. + * 3. fpl->bufaddr must be a real address, 4k aligned + */ +static int diag_ftp_2c4(struct diag_ftp_ldfpl *fpl, + enum hmcdrv_ftp_cmdid cmd) +{ + int rc; + + diag_stat_inc(DIAG_STAT_X2C4); + asm volatile( + " diag %[addr],%[cmd],0x2c4\n" + "0: j 2f\n" + "1: la %[rc],%[err]\n" + "2:\n" + EX_TABLE(0b, 1b) + : [rc] "=d" (rc), "+m" (*fpl) + : [cmd] "0" (cmd), [addr] "d" (virt_to_phys(fpl)), + [err] "i" (DIAG_FTP_RET_EPERM) + : "cc"); + + switch (rc) { + case DIAG_FTP_RET_OK: + return 0; + case DIAG_FTP_RET_EBUSY: + return -EBUSY; + case DIAG_FTP_RET_EPERM: + return -EPERM; + case DIAG_FTP_RET_EIO: + default: + return -EIO; + } +} + +/** + * diag_ftp_cmd() - executes a DIAG X'2C4' FTP command, targeting a HMC + * @ftp: pointer to FTP command specification + * @fsize: return of file size (or NULL if undesirable) + * + * Attention: Notice that this function is not reentrant - so the caller + * must ensure locking. + * + * Return: number of bytes read/written or a (negative) error code + */ +ssize_t diag_ftp_cmd(const struct hmcdrv_ftp_cmdspec *ftp, size_t *fsize) +{ + struct diag_ftp_ldfpl *ldfpl; + ssize_t len; +#ifdef DEBUG + unsigned long start_jiffies; + + pr_debug("starting DIAG X'2C4' on '%s', requesting %zd bytes\n", + ftp->fname, ftp->len); + start_jiffies = jiffies; +#endif + init_completion(&diag_ftp_rx_complete); + + ldfpl = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!ldfpl) { + len = -ENOMEM; + goto out; + } + + len = strlcpy(ldfpl->fident, ftp->fname, sizeof(ldfpl->fident)); + if (len >= HMCDRV_FTP_FIDENT_MAX) { + len = -EINVAL; + goto out_free; + } + + ldfpl->transferred = 0; + ldfpl->fsize = 0; + ldfpl->offset = ftp->ofs; + ldfpl->buflen = ftp->len; + ldfpl->bufaddr = virt_to_phys(ftp->buf); + + len = diag_ftp_2c4(ldfpl, ftp->id); + if (len) + goto out_free; + + /* + * There is no way to cancel the running diag X'2C4', the code + * needs to wait unconditionally until the transfer is complete. + */ + wait_for_completion(&diag_ftp_rx_complete); + +#ifdef DEBUG + pr_debug("completed DIAG X'2C4' after %lu ms\n", + (jiffies - start_jiffies) * 1000 / HZ); + pr_debug("status of DIAG X'2C4' is %u, with %lld/%lld bytes\n", + diag_ftp_subcode, ldfpl->transferred, ldfpl->fsize); +#endif + + switch (diag_ftp_subcode) { + case DIAG_FTP_STAT_OK: /* success */ + len = ldfpl->transferred; + if (fsize) + *fsize = ldfpl->fsize; + break; + case DIAG_FTP_STAT_LDNPERM: + len = -EPERM; + break; + case DIAG_FTP_STAT_LDRUNS: + len = -EBUSY; + break; + case DIAG_FTP_STAT_LDFAIL: + len = -ENOENT; /* no such file or media */ + break; + default: + len = -EIO; + break; + } + +out_free: + free_page((unsigned long) ldfpl); +out: + return len; +} + +/** + * diag_ftp_startup() - startup of FTP services, when running on z/VM + * + * Return: 0 on success, else an (negative) error code + */ +int diag_ftp_startup(void) +{ + int rc; + + rc = register_external_irq(EXT_IRQ_CP_SERVICE, diag_ftp_handler); + if (rc) + return rc; + + irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); + return 0; +} + +/** + * diag_ftp_shutdown() - shutdown of FTP services, when running on z/VM + */ +void diag_ftp_shutdown(void) +{ + irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL); + unregister_external_irq(EXT_IRQ_CP_SERVICE, diag_ftp_handler); +} diff --git a/drivers/s390/char/diag_ftp.h b/drivers/s390/char/diag_ftp.h new file mode 100644 index 000000000..5d036ba71 --- /dev/null +++ b/drivers/s390/char/diag_ftp.h @@ -0,0 +1,22 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * DIAGNOSE X'2C4' instruction based SE/HMC FTP Services, useable on z/VM + * + * Notice that all functions exported here are not reentrant. + * So usage should be exclusive, ensured by the caller (e.g. using a + * mutex). + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + */ + +#ifndef __DIAG_FTP_H__ +#define __DIAG_FTP_H__ + +#include "hmcdrv_ftp.h" + +int diag_ftp_startup(void); +void diag_ftp_shutdown(void); +ssize_t diag_ftp_cmd(const struct hmcdrv_ftp_cmdspec *ftp, size_t *fsize); + +#endif /* __DIAG_FTP_H__ */ diff --git a/drivers/s390/char/fs3270.c b/drivers/s390/char/fs3270.c new file mode 100644 index 000000000..2f9905ee0 --- /dev/null +++ b/drivers/s390/char/fs3270.c @@ -0,0 +1,576 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * IBM/3270 Driver - fullscreen driver. + * + * Author(s): + * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global) + * Rewritten for 2.5/2.6 by Martin Schwidefsky + * Copyright IBM Corp. 2003, 2009 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "raw3270.h" +#include "ctrlchar.h" + +static struct raw3270_fn fs3270_fn; + +struct fs3270 { + struct raw3270_view view; + struct pid *fs_pid; /* Pid of controlling program. */ + int read_command; /* ccw command to use for reads. */ + int write_command; /* ccw command to use for writes. */ + int attention; /* Got attention. */ + int active; /* Fullscreen view is active. */ + struct raw3270_request *init; /* single init request. */ + wait_queue_head_t wait; /* Init & attention wait queue. */ + struct idal_buffer *rdbuf; /* full-screen-deactivate buffer */ + size_t rdbuf_size; /* size of data returned by RDBUF */ +}; + +static DEFINE_MUTEX(fs3270_mutex); + +static void +fs3270_wake_up(struct raw3270_request *rq, void *data) +{ + wake_up((wait_queue_head_t *) data); +} + +static inline int +fs3270_working(struct fs3270 *fp) +{ + /* + * The fullscreen view is in working order if the view + * has been activated AND the initial request is finished. + */ + return fp->active && raw3270_request_final(fp->init); +} + +static int +fs3270_do_io(struct raw3270_view *view, struct raw3270_request *rq) +{ + struct fs3270 *fp; + int rc; + + fp = (struct fs3270 *) view; + rq->callback = fs3270_wake_up; + rq->callback_data = &fp->wait; + + do { + if (!fs3270_working(fp)) { + /* Fullscreen view isn't ready yet. */ + rc = wait_event_interruptible(fp->wait, + fs3270_working(fp)); + if (rc != 0) + break; + } + rc = raw3270_start(view, rq); + if (rc == 0) { + /* Started successfully. Now wait for completion. */ + wait_event(fp->wait, raw3270_request_final(rq)); + } + } while (rc == -EACCES); + return rc; +} + +/* + * Switch to the fullscreen view. + */ +static void +fs3270_reset_callback(struct raw3270_request *rq, void *data) +{ + struct fs3270 *fp; + + fp = (struct fs3270 *) rq->view; + raw3270_request_reset(rq); + wake_up(&fp->wait); +} + +static void +fs3270_restore_callback(struct raw3270_request *rq, void *data) +{ + struct fs3270 *fp; + + fp = (struct fs3270 *) rq->view; + if (rq->rc != 0 || rq->rescnt != 0) { + if (fp->fs_pid) + kill_pid(fp->fs_pid, SIGHUP, 1); + } + fp->rdbuf_size = 0; + raw3270_request_reset(rq); + wake_up(&fp->wait); +} + +static int +fs3270_activate(struct raw3270_view *view) +{ + struct fs3270 *fp; + char *cp; + int rc; + + fp = (struct fs3270 *) view; + + /* If an old init command is still running just return. */ + if (!raw3270_request_final(fp->init)) + return 0; + + if (fp->rdbuf_size == 0) { + /* No saved buffer. Just clear the screen. */ + raw3270_request_set_cmd(fp->init, TC_EWRITEA); + fp->init->callback = fs3270_reset_callback; + } else { + /* Restore fullscreen buffer saved by fs3270_deactivate. */ + raw3270_request_set_cmd(fp->init, TC_EWRITEA); + raw3270_request_set_idal(fp->init, fp->rdbuf); + fp->init->ccw.count = fp->rdbuf_size; + cp = fp->rdbuf->data[0]; + cp[0] = TW_KR; + cp[1] = TO_SBA; + cp[2] = cp[6]; + cp[3] = cp[7]; + cp[4] = TO_IC; + cp[5] = TO_SBA; + cp[6] = 0x40; + cp[7] = 0x40; + fp->init->rescnt = 0; + fp->init->callback = fs3270_restore_callback; + } + rc = fp->init->rc = raw3270_start_locked(view, fp->init); + if (rc) + fp->init->callback(fp->init, NULL); + else + fp->active = 1; + return rc; +} + +/* + * Shutdown fullscreen view. + */ +static void +fs3270_save_callback(struct raw3270_request *rq, void *data) +{ + struct fs3270 *fp; + + fp = (struct fs3270 *) rq->view; + + /* Correct idal buffer element 0 address. */ + fp->rdbuf->data[0] -= 5; + fp->rdbuf->size += 5; + + /* + * If the rdbuf command failed or the idal buffer is + * to small for the amount of data returned by the + * rdbuf command, then we have no choice but to send + * a SIGHUP to the application. + */ + if (rq->rc != 0 || rq->rescnt == 0) { + if (fp->fs_pid) + kill_pid(fp->fs_pid, SIGHUP, 1); + fp->rdbuf_size = 0; + } else + fp->rdbuf_size = fp->rdbuf->size - rq->rescnt; + raw3270_request_reset(rq); + wake_up(&fp->wait); +} + +static void +fs3270_deactivate(struct raw3270_view *view) +{ + struct fs3270 *fp; + + fp = (struct fs3270 *) view; + fp->active = 0; + + /* If an old init command is still running just return. */ + if (!raw3270_request_final(fp->init)) + return; + + /* Prepare read-buffer request. */ + raw3270_request_set_cmd(fp->init, TC_RDBUF); + /* + * Hackish: skip first 5 bytes of the idal buffer to make + * room for the TW_KR/TO_SBA/
/
/TO_IC sequence + * in the activation command. + */ + fp->rdbuf->data[0] += 5; + fp->rdbuf->size -= 5; + raw3270_request_set_idal(fp->init, fp->rdbuf); + fp->init->rescnt = 0; + fp->init->callback = fs3270_save_callback; + + /* Start I/O to read in the 3270 buffer. */ + fp->init->rc = raw3270_start_locked(view, fp->init); + if (fp->init->rc) + fp->init->callback(fp->init, NULL); +} + +static void +fs3270_irq(struct fs3270 *fp, struct raw3270_request *rq, struct irb *irb) +{ + /* Handle ATTN. Set indication and wake waiters for attention. */ + if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { + fp->attention = 1; + wake_up(&fp->wait); + } + + if (rq) { + if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) + rq->rc = -EIO; + else + /* Normal end. Copy residual count. */ + rq->rescnt = irb->scsw.cmd.count; + } +} + +/* + * Process reads from fullscreen 3270. + */ +static ssize_t +fs3270_read(struct file *filp, char __user *data, size_t count, loff_t *off) +{ + struct fs3270 *fp; + struct raw3270_request *rq; + struct idal_buffer *ib; + ssize_t rc; + + if (count == 0 || count > 65535) + return -EINVAL; + fp = filp->private_data; + if (!fp) + return -ENODEV; + ib = idal_buffer_alloc(count, 0); + if (IS_ERR(ib)) + return -ENOMEM; + rq = raw3270_request_alloc(0); + if (!IS_ERR(rq)) { + if (fp->read_command == 0 && fp->write_command != 0) + fp->read_command = 6; + raw3270_request_set_cmd(rq, fp->read_command ? : 2); + raw3270_request_set_idal(rq, ib); + rc = wait_event_interruptible(fp->wait, fp->attention); + fp->attention = 0; + if (rc == 0) { + rc = fs3270_do_io(&fp->view, rq); + if (rc == 0) { + count -= rq->rescnt; + if (idal_buffer_to_user(ib, data, count) != 0) + rc = -EFAULT; + else + rc = count; + + } + } + raw3270_request_free(rq); + } else + rc = PTR_ERR(rq); + idal_buffer_free(ib); + return rc; +} + +/* + * Process writes to fullscreen 3270. + */ +static ssize_t +fs3270_write(struct file *filp, const char __user *data, size_t count, loff_t *off) +{ + struct fs3270 *fp; + struct raw3270_request *rq; + struct idal_buffer *ib; + int write_command; + ssize_t rc; + + fp = filp->private_data; + if (!fp) + return -ENODEV; + ib = idal_buffer_alloc(count, 0); + if (IS_ERR(ib)) + return -ENOMEM; + rq = raw3270_request_alloc(0); + if (!IS_ERR(rq)) { + if (idal_buffer_from_user(ib, data, count) == 0) { + write_command = fp->write_command ? : 1; + if (write_command == 5) + write_command = 13; + raw3270_request_set_cmd(rq, write_command); + raw3270_request_set_idal(rq, ib); + rc = fs3270_do_io(&fp->view, rq); + if (rc == 0) + rc = count - rq->rescnt; + } else + rc = -EFAULT; + raw3270_request_free(rq); + } else + rc = PTR_ERR(rq); + idal_buffer_free(ib); + return rc; +} + +/* + * process ioctl commands for the tube driver + */ +static long +fs3270_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + char __user *argp; + struct fs3270 *fp; + struct raw3270_iocb iocb; + int rc; + + fp = filp->private_data; + if (!fp) + return -ENODEV; + if (is_compat_task()) + argp = compat_ptr(arg); + else + argp = (char __user *)arg; + rc = 0; + mutex_lock(&fs3270_mutex); + switch (cmd) { + case TUBICMD: + fp->read_command = arg; + break; + case TUBOCMD: + fp->write_command = arg; + break; + case TUBGETI: + rc = put_user(fp->read_command, argp); + break; + case TUBGETO: + rc = put_user(fp->write_command, argp); + break; + case TUBGETMOD: + iocb.model = fp->view.model; + iocb.line_cnt = fp->view.rows; + iocb.col_cnt = fp->view.cols; + iocb.pf_cnt = 24; + iocb.re_cnt = 20; + iocb.map = 0; + if (copy_to_user(argp, &iocb, sizeof(struct raw3270_iocb))) + rc = -EFAULT; + break; + } + mutex_unlock(&fs3270_mutex); + return rc; +} + +/* + * Allocate fs3270 structure. + */ +static struct fs3270 * +fs3270_alloc_view(void) +{ + struct fs3270 *fp; + + fp = kzalloc(sizeof(struct fs3270),GFP_KERNEL); + if (!fp) + return ERR_PTR(-ENOMEM); + fp->init = raw3270_request_alloc(0); + if (IS_ERR(fp->init)) { + kfree(fp); + return ERR_PTR(-ENOMEM); + } + return fp; +} + +/* + * Free fs3270 structure. + */ +static void +fs3270_free_view(struct raw3270_view *view) +{ + struct fs3270 *fp; + + fp = (struct fs3270 *) view; + if (fp->rdbuf) + idal_buffer_free(fp->rdbuf); + raw3270_request_free(((struct fs3270 *) view)->init); + kfree(view); +} + +/* + * Unlink fs3270 data structure from filp. + */ +static void +fs3270_release(struct raw3270_view *view) +{ + struct fs3270 *fp; + + fp = (struct fs3270 *) view; + if (fp->fs_pid) + kill_pid(fp->fs_pid, SIGHUP, 1); +} + +/* View to a 3270 device. Can be console, tty or fullscreen. */ +static struct raw3270_fn fs3270_fn = { + .activate = fs3270_activate, + .deactivate = fs3270_deactivate, + .intv = (void *) fs3270_irq, + .release = fs3270_release, + .free = fs3270_free_view +}; + +/* + * This routine is called whenever a 3270 fullscreen device is opened. + */ +static int +fs3270_open(struct inode *inode, struct file *filp) +{ + struct fs3270 *fp; + struct idal_buffer *ib; + int minor, rc = 0; + + if (imajor(file_inode(filp)) != IBM_FS3270_MAJOR) + return -ENODEV; + minor = iminor(file_inode(filp)); + /* Check for minor 0 multiplexer. */ + if (minor == 0) { + struct tty_struct *tty = get_current_tty(); + if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) { + tty_kref_put(tty); + return -ENODEV; + } + minor = tty->index; + tty_kref_put(tty); + } + mutex_lock(&fs3270_mutex); + /* Check if some other program is already using fullscreen mode. */ + fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor); + if (!IS_ERR(fp)) { + raw3270_put_view(&fp->view); + rc = -EBUSY; + goto out; + } + /* Allocate fullscreen view structure. */ + fp = fs3270_alloc_view(); + if (IS_ERR(fp)) { + rc = PTR_ERR(fp); + goto out; + } + + init_waitqueue_head(&fp->wait); + fp->fs_pid = get_pid(task_pid(current)); + rc = raw3270_add_view(&fp->view, &fs3270_fn, minor, + RAW3270_VIEW_LOCK_BH); + if (rc) { + fs3270_free_view(&fp->view); + goto out; + } + + /* Allocate idal-buffer. */ + ib = idal_buffer_alloc(2*fp->view.rows*fp->view.cols + 5, 0); + if (IS_ERR(ib)) { + raw3270_put_view(&fp->view); + raw3270_del_view(&fp->view); + rc = PTR_ERR(ib); + goto out; + } + fp->rdbuf = ib; + + rc = raw3270_activate_view(&fp->view); + if (rc) { + raw3270_put_view(&fp->view); + raw3270_del_view(&fp->view); + goto out; + } + nonseekable_open(inode, filp); + filp->private_data = fp; +out: + mutex_unlock(&fs3270_mutex); + return rc; +} + +/* + * This routine is called when the 3270 tty is closed. We wait + * for the remaining request to be completed. Then we clean up. + */ +static int +fs3270_close(struct inode *inode, struct file *filp) +{ + struct fs3270 *fp; + + fp = filp->private_data; + filp->private_data = NULL; + if (fp) { + put_pid(fp->fs_pid); + fp->fs_pid = NULL; + raw3270_reset(&fp->view); + raw3270_put_view(&fp->view); + raw3270_del_view(&fp->view); + } + return 0; +} + +static const struct file_operations fs3270_fops = { + .owner = THIS_MODULE, /* owner */ + .read = fs3270_read, /* read */ + .write = fs3270_write, /* write */ + .unlocked_ioctl = fs3270_ioctl, /* ioctl */ + .compat_ioctl = fs3270_ioctl, /* ioctl */ + .open = fs3270_open, /* open */ + .release = fs3270_close, /* release */ + .llseek = no_llseek, +}; + +static void fs3270_create_cb(int minor) +{ + __register_chrdev(IBM_FS3270_MAJOR, minor, 1, "tub", &fs3270_fops); + device_create(class3270, NULL, MKDEV(IBM_FS3270_MAJOR, minor), + NULL, "3270/tub%d", minor); +} + +static void fs3270_destroy_cb(int minor) +{ + device_destroy(class3270, MKDEV(IBM_FS3270_MAJOR, minor)); + __unregister_chrdev(IBM_FS3270_MAJOR, minor, 1, "tub"); +} + +static struct raw3270_notifier fs3270_notifier = +{ + .create = fs3270_create_cb, + .destroy = fs3270_destroy_cb, +}; + +/* + * 3270 fullscreen driver initialization. + */ +static int __init +fs3270_init(void) +{ + int rc; + + rc = __register_chrdev(IBM_FS3270_MAJOR, 0, 1, "fs3270", &fs3270_fops); + if (rc) + return rc; + device_create(class3270, NULL, MKDEV(IBM_FS3270_MAJOR, 0), + NULL, "3270/tub"); + raw3270_register_notifier(&fs3270_notifier); + return 0; +} + +static void __exit +fs3270_exit(void) +{ + raw3270_unregister_notifier(&fs3270_notifier); + device_destroy(class3270, MKDEV(IBM_FS3270_MAJOR, 0)); + __unregister_chrdev(IBM_FS3270_MAJOR, 0, 1, "fs3270"); +} + +MODULE_LICENSE("GPL"); +MODULE_ALIAS_CHARDEV_MAJOR(IBM_FS3270_MAJOR); + +module_init(fs3270_init); +module_exit(fs3270_exit); diff --git a/drivers/s390/char/hmcdrv_cache.c b/drivers/s390/char/hmcdrv_cache.c new file mode 100644 index 000000000..1f5bdb237 --- /dev/null +++ b/drivers/s390/char/hmcdrv_cache.c @@ -0,0 +1,253 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SE/HMC Drive (Read) Cache Functions + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + * + */ + +#define KMSG_COMPONENT "hmcdrv" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include + +#include "hmcdrv_ftp.h" +#include "hmcdrv_cache.h" + +#define HMCDRV_CACHE_TIMEOUT 30 /* aging timeout in seconds */ + +/** + * struct hmcdrv_cache_entry - file cache (only used on read/dir) + * @id: FTP command ID + * @content: kernel-space buffer, 4k aligned + * @len: size of @content cache (0 if caching disabled) + * @ofs: start of content within file (-1 if no cached content) + * @fname: file name + * @fsize: file size + * @timeout: cache timeout in jiffies + * + * Notice that the first three members (id, fname, fsize) are cached on all + * read/dir requests. But content is cached only under some preconditions. + * Uncached content is signalled by a negative value of @ofs. + */ +struct hmcdrv_cache_entry { + enum hmcdrv_ftp_cmdid id; + char fname[HMCDRV_FTP_FIDENT_MAX]; + size_t fsize; + loff_t ofs; + unsigned long timeout; + void *content; + size_t len; +}; + +static int hmcdrv_cache_order; /* cache allocated page order */ + +static struct hmcdrv_cache_entry hmcdrv_cache_file = { + .fsize = SIZE_MAX, + .ofs = -1, + .len = 0, + .fname = {'\0'} +}; + +/** + * hmcdrv_cache_get() - looks for file data/content in read cache + * @ftp: pointer to FTP command specification + * + * Return: number of bytes read from cache or a negative number if nothing + * in content cache (for the file/cmd specified in @ftp) + */ +static ssize_t hmcdrv_cache_get(const struct hmcdrv_ftp_cmdspec *ftp) +{ + loff_t pos; /* position in cache (signed) */ + ssize_t len; + + if ((ftp->id != hmcdrv_cache_file.id) || + strcmp(hmcdrv_cache_file.fname, ftp->fname)) + return -1; + + if (ftp->ofs >= hmcdrv_cache_file.fsize) /* EOF ? */ + return 0; + + if ((hmcdrv_cache_file.ofs < 0) || /* has content? */ + time_after(jiffies, hmcdrv_cache_file.timeout)) + return -1; + + /* there seems to be cached content - calculate the maximum number + * of bytes that can be returned (regarding file size and offset) + */ + len = hmcdrv_cache_file.fsize - ftp->ofs; + + if (len > ftp->len) + len = ftp->len; + + /* check if the requested chunk falls into our cache (which starts + * at offset 'hmcdrv_cache_file.ofs' in the file of interest) + */ + pos = ftp->ofs - hmcdrv_cache_file.ofs; + + if ((pos >= 0) && + ((pos + len) <= hmcdrv_cache_file.len)) { + + memcpy(ftp->buf, + hmcdrv_cache_file.content + pos, + len); + pr_debug("using cached content of '%s', returning %zd/%zd bytes\n", + hmcdrv_cache_file.fname, len, + hmcdrv_cache_file.fsize); + + return len; + } + + return -1; +} + +/** + * hmcdrv_cache_do() - do a HMC drive CD/DVD transfer with cache update + * @ftp: pointer to FTP command specification + * @func: FTP transfer function to be used + * + * Return: number of bytes read/written or a (negative) error code + */ +static ssize_t hmcdrv_cache_do(const struct hmcdrv_ftp_cmdspec *ftp, + hmcdrv_cache_ftpfunc func) +{ + ssize_t len; + + /* only cache content if the read/dir cache really exists + * (hmcdrv_cache_file.len > 0), is large enough to handle the + * request (hmcdrv_cache_file.len >= ftp->len) and there is a need + * to do so (ftp->len > 0) + */ + if ((ftp->len > 0) && (hmcdrv_cache_file.len >= ftp->len)) { + + /* because the cache is not located at ftp->buf, we have to + * assemble a new HMC drive FTP cmd specification (pointing + * to our cache, and using the increased size) + */ + struct hmcdrv_ftp_cmdspec cftp = *ftp; /* make a copy */ + cftp.buf = hmcdrv_cache_file.content; /* and update */ + cftp.len = hmcdrv_cache_file.len; /* buffer data */ + + len = func(&cftp, &hmcdrv_cache_file.fsize); /* now do */ + + if (len > 0) { + pr_debug("caching %zd bytes content for '%s'\n", + len, ftp->fname); + + if (len > ftp->len) + len = ftp->len; + + hmcdrv_cache_file.ofs = ftp->ofs; + hmcdrv_cache_file.timeout = jiffies + + HMCDRV_CACHE_TIMEOUT * HZ; + memcpy(ftp->buf, hmcdrv_cache_file.content, len); + } + } else { + len = func(ftp, &hmcdrv_cache_file.fsize); + hmcdrv_cache_file.ofs = -1; /* invalidate content */ + } + + if (len > 0) { + /* cache some file info (FTP command, file name and file + * size) unconditionally + */ + strlcpy(hmcdrv_cache_file.fname, ftp->fname, + HMCDRV_FTP_FIDENT_MAX); + hmcdrv_cache_file.id = ftp->id; + pr_debug("caching cmd %d, file size %zu for '%s'\n", + ftp->id, hmcdrv_cache_file.fsize, ftp->fname); + } + + return len; +} + +/** + * hmcdrv_cache_cmd() - perform a cached HMC drive CD/DVD transfer + * @ftp: pointer to FTP command specification + * @func: FTP transfer function to be used + * + * Attention: Notice that this function is not reentrant - so the caller + * must ensure exclusive execution. + * + * Return: number of bytes read/written or a (negative) error code + */ +ssize_t hmcdrv_cache_cmd(const struct hmcdrv_ftp_cmdspec *ftp, + hmcdrv_cache_ftpfunc func) +{ + ssize_t len; + + if ((ftp->id == HMCDRV_FTP_DIR) || /* read cache */ + (ftp->id == HMCDRV_FTP_NLIST) || + (ftp->id == HMCDRV_FTP_GET)) { + + len = hmcdrv_cache_get(ftp); + + if (len >= 0) /* got it from cache ? */ + return len; /* yes */ + + len = hmcdrv_cache_do(ftp, func); + + if (len >= 0) + return len; + + } else { + len = func(ftp, NULL); /* simply do original command */ + } + + /* invalidate the (read) cache in case there was a write operation + * or an error on read/dir + */ + hmcdrv_cache_file.id = HMCDRV_FTP_NOOP; + hmcdrv_cache_file.fsize = LLONG_MAX; + hmcdrv_cache_file.ofs = -1; + + return len; +} + +/** + * hmcdrv_cache_startup() - startup of HMC drive cache + * @cachesize: cache size + * + * Return: 0 on success, else a (negative) error code + */ +int hmcdrv_cache_startup(size_t cachesize) +{ + if (cachesize > 0) { /* perform caching ? */ + hmcdrv_cache_order = get_order(cachesize); + hmcdrv_cache_file.content = + (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, + hmcdrv_cache_order); + + if (!hmcdrv_cache_file.content) { + pr_err("Allocating the requested cache size of %zu bytes failed\n", + cachesize); + return -ENOMEM; + } + + pr_debug("content cache enabled, size is %zu bytes\n", + cachesize); + } + + hmcdrv_cache_file.len = cachesize; + return 0; +} + +/** + * hmcdrv_cache_shutdown() - shutdown of HMC drive cache + */ +void hmcdrv_cache_shutdown(void) +{ + if (hmcdrv_cache_file.content) { + free_pages((unsigned long) hmcdrv_cache_file.content, + hmcdrv_cache_order); + hmcdrv_cache_file.content = NULL; + } + + hmcdrv_cache_file.id = HMCDRV_FTP_NOOP; + hmcdrv_cache_file.fsize = LLONG_MAX; + hmcdrv_cache_file.ofs = -1; + hmcdrv_cache_file.len = 0; /* no cache */ +} diff --git a/drivers/s390/char/hmcdrv_cache.h b/drivers/s390/char/hmcdrv_cache.h new file mode 100644 index 000000000..d69f9fe87 --- /dev/null +++ b/drivers/s390/char/hmcdrv_cache.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * SE/HMC Drive (Read) Cache Functions + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + */ + +#ifndef __HMCDRV_CACHE_H__ +#define __HMCDRV_CACHE_H__ + +#include +#include "hmcdrv_ftp.h" + +#define HMCDRV_CACHE_SIZE_DFLT (MAX_ORDER_NR_PAGES * PAGE_SIZE / 2UL) + +typedef ssize_t (*hmcdrv_cache_ftpfunc)(const struct hmcdrv_ftp_cmdspec *ftp, + size_t *fsize); + +ssize_t hmcdrv_cache_cmd(const struct hmcdrv_ftp_cmdspec *ftp, + hmcdrv_cache_ftpfunc func); +int hmcdrv_cache_startup(size_t cachesize); +void hmcdrv_cache_shutdown(void); + +#endif /* __HMCDRV_CACHE_H__ */ diff --git a/drivers/s390/char/hmcdrv_dev.c b/drivers/s390/char/hmcdrv_dev.c new file mode 100644 index 000000000..20e9cd542 --- /dev/null +++ b/drivers/s390/char/hmcdrv_dev.c @@ -0,0 +1,369 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * HMC Drive CD/DVD Device + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + * + * This file provides a Linux "misc" character device for access to an + * assigned HMC drive CD/DVD-ROM. It works as follows: First create the + * device by calling hmcdrv_dev_init(). After open() a lseek(fd, 0, + * SEEK_END) indicates that a new FTP command follows (not needed on the + * first command after open). Then write() the FTP command ASCII string + * to it, e.g. "dir /" or "nls " or "get ". At the + * end read() the response. + */ + +#define KMSG_COMPONENT "hmcdrv" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "hmcdrv_dev.h" +#include "hmcdrv_ftp.h" + +/* If the following macro is defined, then the HMC device creates it's own + * separated device class (and dynamically assigns a major number). If not + * defined then the HMC device is assigned to the "misc" class devices. + * +#define HMCDRV_DEV_CLASS "hmcftp" + */ + +#define HMCDRV_DEV_NAME "hmcdrv" +#define HMCDRV_DEV_BUSY_DELAY 500 /* delay between -EBUSY trials in ms */ +#define HMCDRV_DEV_BUSY_RETRIES 3 /* number of retries on -EBUSY */ + +struct hmcdrv_dev_node { + +#ifdef HMCDRV_DEV_CLASS + struct cdev dev; /* character device structure */ + umode_t mode; /* mode of device node (unused, zero) */ +#else + struct miscdevice dev; /* "misc" device structure */ +#endif + +}; + +static int hmcdrv_dev_open(struct inode *inode, struct file *fp); +static int hmcdrv_dev_release(struct inode *inode, struct file *fp); +static loff_t hmcdrv_dev_seek(struct file *fp, loff_t pos, int whence); +static ssize_t hmcdrv_dev_read(struct file *fp, char __user *ubuf, + size_t len, loff_t *pos); +static ssize_t hmcdrv_dev_write(struct file *fp, const char __user *ubuf, + size_t len, loff_t *pos); +static ssize_t hmcdrv_dev_transfer(char __kernel *cmd, loff_t offset, + char __user *buf, size_t len); + +/* + * device operations + */ +static const struct file_operations hmcdrv_dev_fops = { + .open = hmcdrv_dev_open, + .llseek = hmcdrv_dev_seek, + .release = hmcdrv_dev_release, + .read = hmcdrv_dev_read, + .write = hmcdrv_dev_write, +}; + +static struct hmcdrv_dev_node hmcdrv_dev; /* HMC device struct (static) */ + +#ifdef HMCDRV_DEV_CLASS + +static struct class *hmcdrv_dev_class; /* device class pointer */ +static dev_t hmcdrv_dev_no; /* device number (major/minor) */ + +/** + * hmcdrv_dev_name() - provides a naming hint for a device node in /dev + * @dev: device for which the naming/mode hint is + * @mode: file mode for device node created in /dev + * + * See: devtmpfs.c, function devtmpfs_create_node() + * + * Return: recommended device file name in /dev + */ +static char *hmcdrv_dev_name(struct device *dev, umode_t *mode) +{ + char *nodename = NULL; + const char *devname = dev_name(dev); /* kernel device name */ + + if (devname) + nodename = kasprintf(GFP_KERNEL, "%s", devname); + + /* on device destroy (rmmod) the mode pointer may be NULL + */ + if (mode) + *mode = hmcdrv_dev.mode; + + return nodename; +} + +#endif /* HMCDRV_DEV_CLASS */ + +/* + * open() + */ +static int hmcdrv_dev_open(struct inode *inode, struct file *fp) +{ + int rc; + + /* check for non-blocking access, which is really unsupported + */ + if (fp->f_flags & O_NONBLOCK) + return -EINVAL; + + /* Because it makes no sense to open this device read-only (then a + * FTP command cannot be emitted), we respond with an error. + */ + if ((fp->f_flags & O_ACCMODE) == O_RDONLY) + return -EINVAL; + + /* prevent unloading this module as long as anyone holds the + * device file open - so increment the reference count here + */ + if (!try_module_get(THIS_MODULE)) + return -ENODEV; + + fp->private_data = NULL; /* no command yet */ + rc = hmcdrv_ftp_startup(); + if (rc) + module_put(THIS_MODULE); + + pr_debug("open file '/dev/%pD' with return code %d\n", fp, rc); + return rc; +} + +/* + * release() + */ +static int hmcdrv_dev_release(struct inode *inode, struct file *fp) +{ + pr_debug("closing file '/dev/%pD'\n", fp); + kfree(fp->private_data); + fp->private_data = NULL; + hmcdrv_ftp_shutdown(); + module_put(THIS_MODULE); + return 0; +} + +/* + * lseek() + */ +static loff_t hmcdrv_dev_seek(struct file *fp, loff_t pos, int whence) +{ + switch (whence) { + case SEEK_CUR: /* relative to current file position */ + pos += fp->f_pos; /* new position stored in 'pos' */ + break; + + case SEEK_SET: /* absolute (relative to beginning of file) */ + break; /* SEEK_SET */ + + /* We use SEEK_END as a special indicator for a SEEK_SET + * (set absolute position), combined with a FTP command + * clear. + */ + case SEEK_END: + if (fp->private_data) { + kfree(fp->private_data); + fp->private_data = NULL; + } + + break; /* SEEK_END */ + + default: /* SEEK_DATA, SEEK_HOLE: unsupported */ + return -EINVAL; + } + + if (pos < 0) + return -EINVAL; + + if (fp->f_pos != pos) + ++fp->f_version; + + fp->f_pos = pos; + return pos; +} + +/* + * transfer (helper function) + */ +static ssize_t hmcdrv_dev_transfer(char __kernel *cmd, loff_t offset, + char __user *buf, size_t len) +{ + ssize_t retlen; + unsigned trials = HMCDRV_DEV_BUSY_RETRIES; + + do { + retlen = hmcdrv_ftp_cmd(cmd, offset, buf, len); + + if (retlen != -EBUSY) + break; + + msleep(HMCDRV_DEV_BUSY_DELAY); + + } while (--trials > 0); + + return retlen; +} + +/* + * read() + */ +static ssize_t hmcdrv_dev_read(struct file *fp, char __user *ubuf, + size_t len, loff_t *pos) +{ + ssize_t retlen; + + if (((fp->f_flags & O_ACCMODE) == O_WRONLY) || + (fp->private_data == NULL)) { /* no FTP cmd defined ? */ + return -EBADF; + } + + retlen = hmcdrv_dev_transfer((char *) fp->private_data, + *pos, ubuf, len); + + pr_debug("read from file '/dev/%pD' at %lld returns %zd/%zu\n", + fp, (long long) *pos, retlen, len); + + if (retlen > 0) + *pos += retlen; + + return retlen; +} + +/* + * write() + */ +static ssize_t hmcdrv_dev_write(struct file *fp, const char __user *ubuf, + size_t len, loff_t *pos) +{ + ssize_t retlen; + + pr_debug("writing file '/dev/%pD' at pos. %lld with length %zd\n", + fp, (long long) *pos, len); + + if (!fp->private_data) { /* first expect a cmd write */ + fp->private_data = kmalloc(len + 1, GFP_KERNEL); + + if (!fp->private_data) + return -ENOMEM; + + if (!copy_from_user(fp->private_data, ubuf, len)) { + ((char *)fp->private_data)[len] = '\0'; + return len; + } + + kfree(fp->private_data); + fp->private_data = NULL; + return -EFAULT; + } + + retlen = hmcdrv_dev_transfer((char *) fp->private_data, + *pos, (char __user *) ubuf, len); + if (retlen > 0) + *pos += retlen; + + pr_debug("write to file '/dev/%pD' returned %zd\n", fp, retlen); + + return retlen; +} + +/** + * hmcdrv_dev_init() - creates a HMC drive CD/DVD device + * + * This function creates a HMC drive CD/DVD kernel device and an associated + * device under /dev, using a dynamically allocated major number. + * + * Return: 0 on success, else an error code. + */ +int hmcdrv_dev_init(void) +{ + int rc; + +#ifdef HMCDRV_DEV_CLASS + struct device *dev; + + rc = alloc_chrdev_region(&hmcdrv_dev_no, 0, 1, HMCDRV_DEV_NAME); + + if (rc) + goto out_err; + + cdev_init(&hmcdrv_dev.dev, &hmcdrv_dev_fops); + hmcdrv_dev.dev.owner = THIS_MODULE; + rc = cdev_add(&hmcdrv_dev.dev, hmcdrv_dev_no, 1); + + if (rc) + goto out_unreg; + + /* At this point the character device exists in the kernel (see + * /proc/devices), but not under /dev nor /sys/devices/virtual. So + * we have to create an associated class (see /sys/class). + */ + hmcdrv_dev_class = class_create(THIS_MODULE, HMCDRV_DEV_CLASS); + + if (IS_ERR(hmcdrv_dev_class)) { + rc = PTR_ERR(hmcdrv_dev_class); + goto out_devdel; + } + + /* Finally a device node in /dev has to be established (as 'mkdev' + * does from the command line). Notice that assignment of a device + * node name/mode function is optional (only for mode != 0600). + */ + hmcdrv_dev.mode = 0; /* "unset" */ + hmcdrv_dev_class->devnode = hmcdrv_dev_name; + + dev = device_create(hmcdrv_dev_class, NULL, hmcdrv_dev_no, NULL, + "%s", HMCDRV_DEV_NAME); + if (!IS_ERR(dev)) + return 0; + + rc = PTR_ERR(dev); + class_destroy(hmcdrv_dev_class); + hmcdrv_dev_class = NULL; + +out_devdel: + cdev_del(&hmcdrv_dev.dev); + +out_unreg: + unregister_chrdev_region(hmcdrv_dev_no, 1); + +out_err: + +#else /* !HMCDRV_DEV_CLASS */ + hmcdrv_dev.dev.minor = MISC_DYNAMIC_MINOR; + hmcdrv_dev.dev.name = HMCDRV_DEV_NAME; + hmcdrv_dev.dev.fops = &hmcdrv_dev_fops; + hmcdrv_dev.dev.mode = 0; /* finally produces 0600 */ + rc = misc_register(&hmcdrv_dev.dev); +#endif /* HMCDRV_DEV_CLASS */ + + return rc; +} + +/** + * hmcdrv_dev_exit() - destroys a HMC drive CD/DVD device + */ +void hmcdrv_dev_exit(void) +{ +#ifdef HMCDRV_DEV_CLASS + if (!IS_ERR_OR_NULL(hmcdrv_dev_class)) { + device_destroy(hmcdrv_dev_class, hmcdrv_dev_no); + class_destroy(hmcdrv_dev_class); + } + + cdev_del(&hmcdrv_dev.dev); + unregister_chrdev_region(hmcdrv_dev_no, 1); +#else /* !HMCDRV_DEV_CLASS */ + misc_deregister(&hmcdrv_dev.dev); +#endif /* HMCDRV_DEV_CLASS */ +} diff --git a/drivers/s390/char/hmcdrv_dev.h b/drivers/s390/char/hmcdrv_dev.h new file mode 100644 index 000000000..558eba929 --- /dev/null +++ b/drivers/s390/char/hmcdrv_dev.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * SE/HMC Drive FTP Device + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + */ + +#ifndef __HMCDRV_DEV_H__ +#define __HMCDRV_DEV_H__ + +int hmcdrv_dev_init(void); +void hmcdrv_dev_exit(void); + +#endif /* __HMCDRV_DEV_H__ */ diff --git a/drivers/s390/char/hmcdrv_ftp.c b/drivers/s390/char/hmcdrv_ftp.c new file mode 100644 index 000000000..0e70397d6 --- /dev/null +++ b/drivers/s390/char/hmcdrv_ftp.c @@ -0,0 +1,344 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * HMC Drive FTP Services + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + */ + +#define KMSG_COMPONENT "hmcdrv" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include + +#include +#include + +#include "hmcdrv_ftp.h" +#include "hmcdrv_cache.h" +#include "sclp_ftp.h" +#include "diag_ftp.h" + +/** + * struct hmcdrv_ftp_ops - HMC drive FTP operations + * @startup: startup function + * @shutdown: shutdown function + * @cmd: FTP transfer function + */ +struct hmcdrv_ftp_ops { + int (*startup)(void); + void (*shutdown)(void); + ssize_t (*transfer)(const struct hmcdrv_ftp_cmdspec *ftp, + size_t *fsize); +}; + +static enum hmcdrv_ftp_cmdid hmcdrv_ftp_cmd_getid(const char *cmd, int len); +static int hmcdrv_ftp_parse(char *cmd, struct hmcdrv_ftp_cmdspec *ftp); + +static const struct hmcdrv_ftp_ops *hmcdrv_ftp_funcs; /* current operations */ +static DEFINE_MUTEX(hmcdrv_ftp_mutex); /* mutex for hmcdrv_ftp_funcs */ +static unsigned hmcdrv_ftp_refcnt; /* start/shutdown reference counter */ + +/** + * hmcdrv_ftp_cmd_getid() - determine FTP command ID from a command string + * @cmd: FTP command string (NOT zero-terminated) + * @len: length of FTP command string in @cmd + */ +static enum hmcdrv_ftp_cmdid hmcdrv_ftp_cmd_getid(const char *cmd, int len) +{ + /* HMC FTP command descriptor */ + struct hmcdrv_ftp_cmd_desc { + const char *str; /* command string */ + enum hmcdrv_ftp_cmdid cmd; /* associated command as enum */ + }; + + /* Description of all HMC drive FTP commands + * + * Notes: + * 1. Array size should be a prime number. + * 2. Do not change the order of commands in table (because the + * index is determined by CRC % ARRAY_SIZE). + * 3. Original command 'nlist' was renamed, else the CRC would + * collide with 'append' (see point 2). + */ + static const struct hmcdrv_ftp_cmd_desc ftpcmds[7] = { + + {.str = "get", /* [0] get (CRC = 0x68eb) */ + .cmd = HMCDRV_FTP_GET}, + {.str = "dir", /* [1] dir (CRC = 0x6a9e) */ + .cmd = HMCDRV_FTP_DIR}, + {.str = "delete", /* [2] delete (CRC = 0x53ae) */ + .cmd = HMCDRV_FTP_DELETE}, + {.str = "nls", /* [3] nls (CRC = 0xf87c) */ + .cmd = HMCDRV_FTP_NLIST}, + {.str = "put", /* [4] put (CRC = 0xac56) */ + .cmd = HMCDRV_FTP_PUT}, + {.str = "append", /* [5] append (CRC = 0xf56e) */ + .cmd = HMCDRV_FTP_APPEND}, + {.str = NULL} /* [6] unused */ + }; + + const struct hmcdrv_ftp_cmd_desc *pdesc; + + u16 crc = 0xffffU; + + if (len == 0) + return HMCDRV_FTP_NOOP; /* error indiactor */ + + crc = crc16(crc, cmd, len); + pdesc = ftpcmds + (crc % ARRAY_SIZE(ftpcmds)); + pr_debug("FTP command '%s' has CRC 0x%04x, at table pos. %lu\n", + cmd, crc, (crc % ARRAY_SIZE(ftpcmds))); + + if (!pdesc->str || strncmp(pdesc->str, cmd, len)) + return HMCDRV_FTP_NOOP; + + pr_debug("FTP command '%s' found, with ID %d\n", + pdesc->str, pdesc->cmd); + + return pdesc->cmd; +} + +/** + * hmcdrv_ftp_parse() - HMC drive FTP command parser + * @cmd: FTP command string " " + * @ftp: Pointer to FTP command specification buffer (output) + * + * Return: 0 on success, else a (negative) error code + */ +static int hmcdrv_ftp_parse(char *cmd, struct hmcdrv_ftp_cmdspec *ftp) +{ + char *start; + int argc = 0; + + ftp->id = HMCDRV_FTP_NOOP; + ftp->fname = NULL; + + while (*cmd != '\0') { + + while (isspace(*cmd)) + ++cmd; + + if (*cmd == '\0') + break; + + start = cmd; + + switch (argc) { + case 0: /* 1st argument (FTP command) */ + while ((*cmd != '\0') && !isspace(*cmd)) + ++cmd; + ftp->id = hmcdrv_ftp_cmd_getid(start, cmd - start); + break; + case 1: /* 2nd / last argument (rest of line) */ + while ((*cmd != '\0') && !iscntrl(*cmd)) + ++cmd; + ftp->fname = start; + /* fall through */ + default: + *cmd = '\0'; + break; + } /* switch */ + + ++argc; + } /* while */ + + if (!ftp->fname || (ftp->id == HMCDRV_FTP_NOOP)) + return -EINVAL; + + return 0; +} + +/** + * hmcdrv_ftp_do() - perform a HMC drive FTP, with data from kernel-space + * @ftp: pointer to FTP command specification + * + * Return: number of bytes read/written or a negative error code + */ +ssize_t hmcdrv_ftp_do(const struct hmcdrv_ftp_cmdspec *ftp) +{ + ssize_t len; + + mutex_lock(&hmcdrv_ftp_mutex); + + if (hmcdrv_ftp_funcs && hmcdrv_ftp_refcnt) { + pr_debug("starting transfer, cmd %d for '%s' at %lld with %zd bytes\n", + ftp->id, ftp->fname, (long long) ftp->ofs, ftp->len); + len = hmcdrv_cache_cmd(ftp, hmcdrv_ftp_funcs->transfer); + } else { + len = -ENXIO; + } + + mutex_unlock(&hmcdrv_ftp_mutex); + return len; +} +EXPORT_SYMBOL(hmcdrv_ftp_do); + +/** + * hmcdrv_ftp_probe() - probe for the HMC drive FTP service + * + * Return: 0 if service is available, else an (negative) error code + */ +int hmcdrv_ftp_probe(void) +{ + int rc; + + struct hmcdrv_ftp_cmdspec ftp = { + .id = HMCDRV_FTP_NOOP, + .ofs = 0, + .fname = "", + .len = PAGE_SIZE + }; + + ftp.buf = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + + if (!ftp.buf) + return -ENOMEM; + + rc = hmcdrv_ftp_startup(); + + if (rc) + goto out; + + rc = hmcdrv_ftp_do(&ftp); + hmcdrv_ftp_shutdown(); + + switch (rc) { + case -ENOENT: /* no such file/media or currently busy, */ + case -EBUSY: /* but service seems to be available */ + rc = 0; + break; + default: /* leave 'rc' as it is for [0, -EPERM, -E...] */ + if (rc > 0) + rc = 0; /* clear length (success) */ + break; + } /* switch */ +out: + free_page((unsigned long) ftp.buf); + return rc; +} +EXPORT_SYMBOL(hmcdrv_ftp_probe); + +/** + * hmcdrv_ftp_cmd() - Perform a HMC drive FTP, with data from user-space + * + * @cmd: FTP command string " " + * @offset: file position to read/write + * @buf: user-space buffer for read/written directory/file + * @len: size of @buf (read/dir) or number of bytes to write + * + * This function must not be called before hmcdrv_ftp_startup() was called. + * + * Return: number of bytes read/written or a negative error code + */ +ssize_t hmcdrv_ftp_cmd(char __kernel *cmd, loff_t offset, + char __user *buf, size_t len) +{ + int order; + + struct hmcdrv_ftp_cmdspec ftp = {.len = len, .ofs = offset}; + ssize_t retlen = hmcdrv_ftp_parse(cmd, &ftp); + + if (retlen) + return retlen; + + order = get_order(ftp.len); + ftp.buf = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, order); + + if (!ftp.buf) + return -ENOMEM; + + switch (ftp.id) { + case HMCDRV_FTP_DIR: + case HMCDRV_FTP_NLIST: + case HMCDRV_FTP_GET: + retlen = hmcdrv_ftp_do(&ftp); + + if ((retlen >= 0) && + copy_to_user(buf, ftp.buf, retlen)) + retlen = -EFAULT; + break; + + case HMCDRV_FTP_PUT: + case HMCDRV_FTP_APPEND: + if (!copy_from_user(ftp.buf, buf, ftp.len)) + retlen = hmcdrv_ftp_do(&ftp); + else + retlen = -EFAULT; + break; + + case HMCDRV_FTP_DELETE: + retlen = hmcdrv_ftp_do(&ftp); + break; + + default: + retlen = -EOPNOTSUPP; + break; + } + + free_pages((unsigned long) ftp.buf, order); + return retlen; +} + +/** + * hmcdrv_ftp_startup() - startup of HMC drive FTP functionality for a + * dedicated (owner) instance + * + * Return: 0 on success, else an (negative) error code + */ +int hmcdrv_ftp_startup(void) +{ + static const struct hmcdrv_ftp_ops hmcdrv_ftp_zvm = { + .startup = diag_ftp_startup, + .shutdown = diag_ftp_shutdown, + .transfer = diag_ftp_cmd + }; + + static const struct hmcdrv_ftp_ops hmcdrv_ftp_lpar = { + .startup = sclp_ftp_startup, + .shutdown = sclp_ftp_shutdown, + .transfer = sclp_ftp_cmd + }; + + int rc = 0; + + mutex_lock(&hmcdrv_ftp_mutex); /* block transfers while start-up */ + + if (hmcdrv_ftp_refcnt == 0) { + if (MACHINE_IS_VM) + hmcdrv_ftp_funcs = &hmcdrv_ftp_zvm; + else if (MACHINE_IS_LPAR || MACHINE_IS_KVM) + hmcdrv_ftp_funcs = &hmcdrv_ftp_lpar; + else + rc = -EOPNOTSUPP; + + if (hmcdrv_ftp_funcs) + rc = hmcdrv_ftp_funcs->startup(); + } + + if (!rc) + ++hmcdrv_ftp_refcnt; + + mutex_unlock(&hmcdrv_ftp_mutex); + return rc; +} +EXPORT_SYMBOL(hmcdrv_ftp_startup); + +/** + * hmcdrv_ftp_shutdown() - shutdown of HMC drive FTP functionality for a + * dedicated (owner) instance + */ +void hmcdrv_ftp_shutdown(void) +{ + mutex_lock(&hmcdrv_ftp_mutex); + --hmcdrv_ftp_refcnt; + + if ((hmcdrv_ftp_refcnt == 0) && hmcdrv_ftp_funcs) + hmcdrv_ftp_funcs->shutdown(); + + mutex_unlock(&hmcdrv_ftp_mutex); +} +EXPORT_SYMBOL(hmcdrv_ftp_shutdown); diff --git a/drivers/s390/char/hmcdrv_ftp.h b/drivers/s390/char/hmcdrv_ftp.h new file mode 100644 index 000000000..d12ca12b5 --- /dev/null +++ b/drivers/s390/char/hmcdrv_ftp.h @@ -0,0 +1,64 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * SE/HMC Drive FTP Services + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + */ + +#ifndef __HMCDRV_FTP_H__ +#define __HMCDRV_FTP_H__ + +#include /* size_t, loff_t */ + +/* + * HMC drive FTP Service max. length of path (w/ EOS) + */ +#define HMCDRV_FTP_FIDENT_MAX 192 + +/** + * enum hmcdrv_ftp_cmdid - HMC drive FTP commands + * @HMCDRV_FTP_NOOP: do nothing (only for probing) + * @HMCDRV_FTP_GET: read a file + * @HMCDRV_FTP_PUT: (over-) write a file + * @HMCDRV_FTP_APPEND: append to a file + * @HMCDRV_FTP_DIR: list directory long (ls -l) + * @HMCDRV_FTP_NLIST: list files, no directories (name list) + * @HMCDRV_FTP_DELETE: delete a file + * @HMCDRV_FTP_CANCEL: cancel operation (SCLP/LPAR only) + */ +enum hmcdrv_ftp_cmdid { + HMCDRV_FTP_NOOP = 0, + HMCDRV_FTP_GET = 1, + HMCDRV_FTP_PUT = 2, + HMCDRV_FTP_APPEND = 3, + HMCDRV_FTP_DIR = 4, + HMCDRV_FTP_NLIST = 5, + HMCDRV_FTP_DELETE = 6, + HMCDRV_FTP_CANCEL = 7 +}; + +/** + * struct hmcdrv_ftp_cmdspec - FTP command specification + * @id: FTP command ID + * @ofs: offset in file + * @fname: filename (ASCII), null-terminated + * @buf: kernel-space transfer data buffer, 4k aligned + * @len: (max) number of bytes to transfer from/to @buf + */ +struct hmcdrv_ftp_cmdspec { + enum hmcdrv_ftp_cmdid id; + loff_t ofs; + const char *fname; + void __kernel *buf; + size_t len; +}; + +int hmcdrv_ftp_startup(void); +void hmcdrv_ftp_shutdown(void); +int hmcdrv_ftp_probe(void); +ssize_t hmcdrv_ftp_do(const struct hmcdrv_ftp_cmdspec *ftp); +ssize_t hmcdrv_ftp_cmd(char __kernel *cmd, loff_t offset, + char __user *buf, size_t len); + +#endif /* __HMCDRV_FTP_H__ */ diff --git a/drivers/s390/char/hmcdrv_mod.c b/drivers/s390/char/hmcdrv_mod.c new file mode 100644 index 000000000..1447d0887 --- /dev/null +++ b/drivers/s390/char/hmcdrv_mod.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * HMC Drive DVD Module + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + */ + +#define KMSG_COMPONENT "hmcdrv" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include + +#include "hmcdrv_ftp.h" +#include "hmcdrv_dev.h" +#include "hmcdrv_cache.h" + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Copyright 2013 IBM Corporation"); +MODULE_DESCRIPTION("HMC drive DVD access"); + +/* + * module parameter 'cachesize' + */ +static size_t hmcdrv_mod_cachesize = HMCDRV_CACHE_SIZE_DFLT; +module_param_named(cachesize, hmcdrv_mod_cachesize, ulong, S_IRUGO); + +/** + * hmcdrv_mod_init() - module init function + */ +static int __init hmcdrv_mod_init(void) +{ + int rc = hmcdrv_ftp_probe(); /* perform w/o cache */ + + if (rc) + return rc; + + rc = hmcdrv_cache_startup(hmcdrv_mod_cachesize); + + if (rc) + return rc; + + rc = hmcdrv_dev_init(); + + if (rc) + hmcdrv_cache_shutdown(); + + return rc; +} + +/** + * hmcdrv_mod_exit() - module exit function + */ +static void __exit hmcdrv_mod_exit(void) +{ + hmcdrv_dev_exit(); + hmcdrv_cache_shutdown(); +} + +module_init(hmcdrv_mod_init); +module_exit(hmcdrv_mod_exit); diff --git a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c new file mode 100644 index 000000000..567aedc03 --- /dev/null +++ b/drivers/s390/char/keyboard.c @@ -0,0 +1,579 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ebcdic keycode functions for s390 console drivers + * + * S390 version + * Copyright IBM Corp. 2003 + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), + */ + +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "keyboard.h" + +/* + * Handler Tables. + */ +#define K_HANDLERS\ + k_self, k_fn, k_spec, k_ignore,\ + k_dead, k_ignore, k_ignore, k_ignore,\ + k_ignore, k_ignore, k_ignore, k_ignore,\ + k_ignore, k_ignore, k_ignore, k_ignore + +typedef void (k_handler_fn)(struct kbd_data *, unsigned char); +static k_handler_fn K_HANDLERS; +static k_handler_fn *k_handler[16] = { K_HANDLERS }; + +/* maximum values each key_handler can handle */ +static const int kbd_max_vals[] = { + 255, ARRAY_SIZE(func_table) - 1, NR_FN_HANDLER - 1, 0, + NR_DEAD - 1, 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; +static const int KBD_NR_TYPES = ARRAY_SIZE(kbd_max_vals); + +static const unsigned char ret_diacr[NR_DEAD] = { + '`', /* dead_grave */ + '\'', /* dead_acute */ + '^', /* dead_circumflex */ + '~', /* dead_tilda */ + '"', /* dead_diaeresis */ + ',', /* dead_cedilla */ + '_', /* dead_macron */ + 'U', /* dead_breve */ + '.', /* dead_abovedot */ + '*', /* dead_abovering */ + '=', /* dead_doubleacute */ + 'c', /* dead_caron */ + 'k', /* dead_ogonek */ + 'i', /* dead_iota */ + '#', /* dead_voiced_sound */ + 'o', /* dead_semivoiced_sound */ + '!', /* dead_belowdot */ + '?', /* dead_hook */ + '+', /* dead_horn */ + '-', /* dead_stroke */ + ')', /* dead_abovecomma */ + '(', /* dead_abovereversedcomma */ + ':', /* dead_doublegrave */ + 'n', /* dead_invertedbreve */ + ';', /* dead_belowcomma */ + '$', /* dead_currency */ + '@', /* dead_greek */ +}; + +/* + * Alloc/free of kbd_data structures. + */ +struct kbd_data * +kbd_alloc(void) { + struct kbd_data *kbd; + int i; + + kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL); + if (!kbd) + goto out; + kbd->key_maps = kzalloc(sizeof(ebc_key_maps), GFP_KERNEL); + if (!kbd->key_maps) + goto out_kbd; + for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++) { + if (ebc_key_maps[i]) { + kbd->key_maps[i] = kmemdup(ebc_key_maps[i], + sizeof(u_short) * NR_KEYS, + GFP_KERNEL); + if (!kbd->key_maps[i]) + goto out_maps; + } + } + kbd->func_table = kzalloc(sizeof(ebc_func_table), GFP_KERNEL); + if (!kbd->func_table) + goto out_maps; + for (i = 0; i < ARRAY_SIZE(ebc_func_table); i++) { + if (ebc_func_table[i]) { + kbd->func_table[i] = kstrdup(ebc_func_table[i], + GFP_KERNEL); + if (!kbd->func_table[i]) + goto out_func; + } + } + kbd->fn_handler = + kcalloc(NR_FN_HANDLER, sizeof(fn_handler_fn *), GFP_KERNEL); + if (!kbd->fn_handler) + goto out_func; + kbd->accent_table = kmemdup(ebc_accent_table, + sizeof(struct kbdiacruc) * MAX_DIACR, + GFP_KERNEL); + if (!kbd->accent_table) + goto out_fn_handler; + kbd->accent_table_size = ebc_accent_table_size; + return kbd; + +out_fn_handler: + kfree(kbd->fn_handler); +out_func: + for (i = 0; i < ARRAY_SIZE(ebc_func_table); i++) + kfree(kbd->func_table[i]); + kfree(kbd->func_table); +out_maps: + for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++) + kfree(kbd->key_maps[i]); + kfree(kbd->key_maps); +out_kbd: + kfree(kbd); +out: + return NULL; +} + +void +kbd_free(struct kbd_data *kbd) +{ + int i; + + kfree(kbd->accent_table); + kfree(kbd->fn_handler); + for (i = 0; i < ARRAY_SIZE(ebc_func_table); i++) + kfree(kbd->func_table[i]); + kfree(kbd->func_table); + for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++) + kfree(kbd->key_maps[i]); + kfree(kbd->key_maps); + kfree(kbd); +} + +/* + * Generate ascii -> ebcdic translation table from kbd_data. + */ +void +kbd_ascebc(struct kbd_data *kbd, unsigned char *ascebc) +{ + unsigned short *keymap, keysym; + int i, j, k; + + memset(ascebc, 0x40, 256); + for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++) { + keymap = kbd->key_maps[i]; + if (!keymap) + continue; + for (j = 0; j < NR_KEYS; j++) { + k = ((i & 1) << 7) + j; + keysym = keymap[j]; + if (KTYP(keysym) == (KT_LATIN | 0xf0) || + KTYP(keysym) == (KT_LETTER | 0xf0)) + ascebc[KVAL(keysym)] = k; + else if (KTYP(keysym) == (KT_DEAD | 0xf0)) + ascebc[ret_diacr[KVAL(keysym)]] = k; + } + } +} + +#if 0 +/* + * Generate ebcdic -> ascii translation table from kbd_data. + */ +void +kbd_ebcasc(struct kbd_data *kbd, unsigned char *ebcasc) +{ + unsigned short *keymap, keysym; + int i, j, k; + + memset(ebcasc, ' ', 256); + for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++) { + keymap = kbd->key_maps[i]; + if (!keymap) + continue; + for (j = 0; j < NR_KEYS; j++) { + keysym = keymap[j]; + k = ((i & 1) << 7) + j; + if (KTYP(keysym) == (KT_LATIN | 0xf0) || + KTYP(keysym) == (KT_LETTER | 0xf0)) + ebcasc[k] = KVAL(keysym); + else if (KTYP(keysym) == (KT_DEAD | 0xf0)) + ebcasc[k] = ret_diacr[KVAL(keysym)]; + } + } +} +#endif + +/* + * We have a combining character DIACR here, followed by the character CH. + * If the combination occurs in the table, return the corresponding value. + * Otherwise, if CH is a space or equals DIACR, return DIACR. + * Otherwise, conclude that DIACR was not combining after all, + * queue it and return CH. + */ +static unsigned int +handle_diacr(struct kbd_data *kbd, unsigned int ch) +{ + int i, d; + + d = kbd->diacr; + kbd->diacr = 0; + + for (i = 0; i < kbd->accent_table_size; i++) { + if (kbd->accent_table[i].diacr == d && + kbd->accent_table[i].base == ch) + return kbd->accent_table[i].result; + } + + if (ch == ' ' || ch == d) + return d; + + kbd_put_queue(kbd->port, d); + return ch; +} + +/* + * Handle dead key. + */ +static void +k_dead(struct kbd_data *kbd, unsigned char value) +{ + value = ret_diacr[value]; + kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value); +} + +/* + * Normal character handler. + */ +static void +k_self(struct kbd_data *kbd, unsigned char value) +{ + if (kbd->diacr) + value = handle_diacr(kbd, value); + kbd_put_queue(kbd->port, value); +} + +/* + * Special key handlers + */ +static void +k_ignore(struct kbd_data *kbd, unsigned char value) +{ +} + +/* + * Function key handler. + */ +static void +k_fn(struct kbd_data *kbd, unsigned char value) +{ + if (kbd->func_table[value]) + kbd_puts_queue(kbd->port, kbd->func_table[value]); +} + +static void +k_spec(struct kbd_data *kbd, unsigned char value) +{ + if (value >= NR_FN_HANDLER) + return; + if (kbd->fn_handler[value]) + kbd->fn_handler[value](kbd); +} + +/* + * Put utf8 character to tty flip buffer. + * UTF-8 is defined for words of up to 31 bits, + * but we need only 16 bits here + */ +static void +to_utf8(struct tty_port *port, ushort c) +{ + if (c < 0x80) + /* 0******* */ + kbd_put_queue(port, c); + else if (c < 0x800) { + /* 110***** 10****** */ + kbd_put_queue(port, 0xc0 | (c >> 6)); + kbd_put_queue(port, 0x80 | (c & 0x3f)); + } else { + /* 1110**** 10****** 10****** */ + kbd_put_queue(port, 0xe0 | (c >> 12)); + kbd_put_queue(port, 0x80 | ((c >> 6) & 0x3f)); + kbd_put_queue(port, 0x80 | (c & 0x3f)); + } +} + +/* + * Process keycode. + */ +void +kbd_keycode(struct kbd_data *kbd, unsigned int keycode) +{ + unsigned short keysym; + unsigned char type, value; + + if (!kbd) + return; + + if (keycode >= 384) + keysym = kbd->key_maps[5][keycode - 384]; + else if (keycode >= 256) + keysym = kbd->key_maps[4][keycode - 256]; + else if (keycode >= 128) + keysym = kbd->key_maps[1][keycode - 128]; + else + keysym = kbd->key_maps[0][keycode]; + + type = KTYP(keysym); + if (type >= 0xf0) { + type -= 0xf0; + if (type == KT_LETTER) + type = KT_LATIN; + value = KVAL(keysym); +#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */ + if (kbd->sysrq) { + if (kbd->sysrq == K(KT_LATIN, '-')) { + kbd->sysrq = 0; + handle_sysrq(value); + return; + } + if (value == '-') { + kbd->sysrq = K(KT_LATIN, '-'); + return; + } + /* Incomplete sysrq sequence. */ + (*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq)); + kbd->sysrq = 0; + } else if ((type == KT_LATIN && value == '^') || + (type == KT_DEAD && ret_diacr[value] == '^')) { + kbd->sysrq = K(type, value); + return; + } +#endif + (*k_handler[type])(kbd, value); + } else + to_utf8(kbd->port, keysym); +} + +/* + * Ioctl stuff. + */ +static int +do_kdsk_ioctl(struct kbd_data *kbd, struct kbentry __user *user_kbe, + int cmd, int perm) +{ + struct kbentry tmp; + unsigned long kb_index, kb_table; + ushort *key_map, val, ov; + + if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry))) + return -EFAULT; + kb_index = (unsigned long) tmp.kb_index; +#if NR_KEYS < 256 + if (kb_index >= NR_KEYS) + return -EINVAL; +#endif + kb_table = (unsigned long) tmp.kb_table; +#if MAX_NR_KEYMAPS < 256 + if (kb_table >= MAX_NR_KEYMAPS) + return -EINVAL; + kb_table = array_index_nospec(kb_table , MAX_NR_KEYMAPS); +#endif + + switch (cmd) { + case KDGKBENT: + key_map = kbd->key_maps[kb_table]; + if (key_map) { + val = U(key_map[kb_index]); + if (KTYP(val) >= KBD_NR_TYPES) + val = K_HOLE; + } else + val = (kb_index ? K_HOLE : K_NOSUCHMAP); + return put_user(val, &user_kbe->kb_value); + case KDSKBENT: + if (!perm) + return -EPERM; + if (!kb_index && tmp.kb_value == K_NOSUCHMAP) { + /* disallocate map */ + key_map = kbd->key_maps[kb_table]; + if (key_map) { + kbd->key_maps[kb_table] = NULL; + kfree(key_map); + } + break; + } + + if (KTYP(tmp.kb_value) >= KBD_NR_TYPES) + return -EINVAL; + if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)]) + return -EINVAL; + + if (!(key_map = kbd->key_maps[kb_table])) { + int j; + + key_map = kmalloc(sizeof(plain_map), + GFP_KERNEL); + if (!key_map) + return -ENOMEM; + kbd->key_maps[kb_table] = key_map; + for (j = 0; j < NR_KEYS; j++) + key_map[j] = U(K_HOLE); + } + ov = U(key_map[kb_index]); + if (tmp.kb_value == ov) + break; /* nothing to do */ + /* + * Attention Key. + */ + if (((ov == K_SAK) || (tmp.kb_value == K_SAK)) && + !capable(CAP_SYS_ADMIN)) + return -EPERM; + key_map[kb_index] = U(tmp.kb_value); + break; + } + return 0; +} + +static int +do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs, + int cmd, int perm) +{ + unsigned char kb_func; + char *p; + int len; + + /* Get u_kbs->kb_func. */ + if (get_user(kb_func, &u_kbs->kb_func)) + return -EFAULT; +#if MAX_NR_FUNC < 256 + if (kb_func >= MAX_NR_FUNC) + return -EINVAL; +#endif + + switch (cmd) { + case KDGKBSENT: + p = kbd->func_table[kb_func]; + if (p) { + len = strlen(p); + if (len >= sizeof(u_kbs->kb_string)) + len = sizeof(u_kbs->kb_string) - 1; + if (copy_to_user(u_kbs->kb_string, p, len)) + return -EFAULT; + } else + len = 0; + if (put_user('\0', u_kbs->kb_string + len)) + return -EFAULT; + break; + case KDSKBSENT: + if (!perm) + return -EPERM; + p = strndup_user(u_kbs->kb_string, sizeof(u_kbs->kb_string)); + if (IS_ERR(p)) + return PTR_ERR(p); + kfree(kbd->func_table[kb_func]); + kbd->func_table[kb_func] = p; + break; + } + return 0; +} + +int kbd_ioctl(struct kbd_data *kbd, unsigned int cmd, unsigned long arg) +{ + struct tty_struct *tty; + void __user *argp; + unsigned int ct; + int perm; + + argp = (void __user *)arg; + + /* + * To have permissions to do most of the vt ioctls, we either have + * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. + */ + tty = tty_port_tty_get(kbd->port); + /* FIXME this test is pretty racy */ + perm = current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG); + tty_kref_put(tty); + switch (cmd) { + case KDGKBTYPE: + return put_user(KB_101, (char __user *)argp); + case KDGKBENT: + case KDSKBENT: + return do_kdsk_ioctl(kbd, argp, cmd, perm); + case KDGKBSENT: + case KDSKBSENT: + return do_kdgkb_ioctl(kbd, argp, cmd, perm); + case KDGKBDIACR: + { + struct kbdiacrs __user *a = argp; + struct kbdiacr diacr; + int i; + + if (put_user(kbd->accent_table_size, &a->kb_cnt)) + return -EFAULT; + for (i = 0; i < kbd->accent_table_size; i++) { + diacr.diacr = kbd->accent_table[i].diacr; + diacr.base = kbd->accent_table[i].base; + diacr.result = kbd->accent_table[i].result; + if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) + return -EFAULT; + } + return 0; + } + case KDGKBDIACRUC: + { + struct kbdiacrsuc __user *a = argp; + + ct = kbd->accent_table_size; + if (put_user(ct, &a->kb_cnt)) + return -EFAULT; + if (copy_to_user(a->kbdiacruc, kbd->accent_table, + ct * sizeof(struct kbdiacruc))) + return -EFAULT; + return 0; + } + case KDSKBDIACR: + { + struct kbdiacrs __user *a = argp; + struct kbdiacr diacr; + int i; + + if (!perm) + return -EPERM; + if (get_user(ct, &a->kb_cnt)) + return -EFAULT; + if (ct >= MAX_DIACR) + return -EINVAL; + kbd->accent_table_size = ct; + for (i = 0; i < ct; i++) { + if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) + return -EFAULT; + kbd->accent_table[i].diacr = diacr.diacr; + kbd->accent_table[i].base = diacr.base; + kbd->accent_table[i].result = diacr.result; + } + return 0; + } + case KDSKBDIACRUC: + { + struct kbdiacrsuc __user *a = argp; + + if (!perm) + return -EPERM; + if (get_user(ct, &a->kb_cnt)) + return -EFAULT; + if (ct >= MAX_DIACR) + return -EINVAL; + kbd->accent_table_size = ct; + if (copy_from_user(kbd->accent_table, a->kbdiacruc, + ct * sizeof(struct kbdiacruc))) + return -EFAULT; + return 0; + } + default: + return -ENOIOCTLCMD; + } +} + +EXPORT_SYMBOL(kbd_ioctl); +EXPORT_SYMBOL(kbd_ascebc); +EXPORT_SYMBOL(kbd_free); +EXPORT_SYMBOL(kbd_alloc); +EXPORT_SYMBOL(kbd_keycode); diff --git a/drivers/s390/char/keyboard.h b/drivers/s390/char/keyboard.h new file mode 100644 index 000000000..c467589c7 --- /dev/null +++ b/drivers/s390/char/keyboard.h @@ -0,0 +1,68 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * ebcdic keycode functions for s390 console drivers + * + * Copyright IBM Corp. 2003 + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), + */ + +#include +#include +#include + +#define NR_FN_HANDLER 20 + +struct kbd_data; + +extern int ebc_funcbufsize, ebc_funcbufleft; +extern char *ebc_func_table[MAX_NR_FUNC]; +extern char ebc_func_buf[]; +extern char *ebc_funcbufptr; +extern unsigned int ebc_keymap_count; + +extern struct kbdiacruc ebc_accent_table[]; +extern unsigned int ebc_accent_table_size; +extern unsigned short *ebc_key_maps[MAX_NR_KEYMAPS]; +extern unsigned short ebc_plain_map[NR_KEYS]; + +typedef void (fn_handler_fn)(struct kbd_data *); + +/* + * FIXME: explain key_maps tricks. + */ + +struct kbd_data { + struct tty_port *port; + unsigned short **key_maps; + char **func_table; + fn_handler_fn **fn_handler; + struct kbdiacruc *accent_table; + unsigned int accent_table_size; + unsigned int diacr; + unsigned short sysrq; +}; + +struct kbd_data *kbd_alloc(void); +void kbd_free(struct kbd_data *); +void kbd_ascebc(struct kbd_data *, unsigned char *); + +void kbd_keycode(struct kbd_data *, unsigned int); +int kbd_ioctl(struct kbd_data *, unsigned int, unsigned long); + +/* + * Helper Functions. + */ +static inline void +kbd_put_queue(struct tty_port *port, int ch) +{ + tty_insert_flip_char(port, ch, 0); + tty_schedule_flip(port); +} + +static inline void +kbd_puts_queue(struct tty_port *port, char *cp) +{ + while (*cp) + tty_insert_flip_char(port, *cp++, 0); + tty_schedule_flip(port); +} diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c new file mode 100644 index 000000000..7bc616b25 --- /dev/null +++ b/drivers/s390/char/monreader.c @@ -0,0 +1,652 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Character device driver for reading z/VM *MONITOR service records. + * + * Copyright IBM Corp. 2004, 2009 + * + * Author: Gerald Schaefer + */ + +#define KMSG_COMPONENT "monreader" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#define MON_COLLECT_SAMPLE 0x80 +#define MON_COLLECT_EVENT 0x40 +#define MON_SERVICE "*MONITOR" +#define MON_IN_USE 0x01 +#define MON_MSGLIM 255 + +static char mon_dcss_name[9] = "MONDCSS\0"; + +struct mon_msg { + u32 pos; + u32 mca_offset; + struct iucv_message msg; + char msglim_reached; + char replied_msglim; +}; + +struct mon_private { + struct iucv_path *path; + struct mon_msg *msg_array[MON_MSGLIM]; + unsigned int write_index; + unsigned int read_index; + atomic_t msglim_count; + atomic_t read_ready; + atomic_t iucv_connected; + atomic_t iucv_severed; +}; + +static unsigned long mon_in_use = 0; + +static unsigned long mon_dcss_start; +static unsigned long mon_dcss_end; + +static DECLARE_WAIT_QUEUE_HEAD(mon_read_wait_queue); +static DECLARE_WAIT_QUEUE_HEAD(mon_conn_wait_queue); + +static u8 user_data_connect[16] = { + /* Version code, must be 0x01 for shared mode */ + 0x01, + /* what to collect */ + MON_COLLECT_SAMPLE | MON_COLLECT_EVENT, + /* DCSS name in EBCDIC, 8 bytes padded with blanks */ + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, +}; + +static u8 user_data_sever[16] = { + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, +}; + +static struct device *monreader_device; + +/****************************************************************************** + * helper functions * + *****************************************************************************/ +/* + * Create the 8 bytes EBCDIC DCSS segment name from + * an ASCII name, incl. padding + */ +static void dcss_mkname(char *ascii_name, char *ebcdic_name) +{ + int i; + + for (i = 0; i < 8; i++) { + if (ascii_name[i] == '\0') + break; + ebcdic_name[i] = toupper(ascii_name[i]); + } + for (; i < 8; i++) + ebcdic_name[i] = ' '; + ASCEBC(ebcdic_name, 8); +} + +static inline unsigned long mon_mca_start(struct mon_msg *monmsg) +{ + return *(u32 *) &monmsg->msg.rmmsg; +} + +static inline unsigned long mon_mca_end(struct mon_msg *monmsg) +{ + return *(u32 *) &monmsg->msg.rmmsg[4]; +} + +static inline u8 mon_mca_type(struct mon_msg *monmsg, u8 index) +{ + return *((u8 *) mon_mca_start(monmsg) + monmsg->mca_offset + index); +} + +static inline u32 mon_mca_size(struct mon_msg *monmsg) +{ + return mon_mca_end(monmsg) - mon_mca_start(monmsg) + 1; +} + +static inline u32 mon_rec_start(struct mon_msg *monmsg) +{ + return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 4)); +} + +static inline u32 mon_rec_end(struct mon_msg *monmsg) +{ + return *((u32 *) (mon_mca_start(monmsg) + monmsg->mca_offset + 8)); +} + +static int mon_check_mca(struct mon_msg *monmsg) +{ + if ((mon_rec_end(monmsg) <= mon_rec_start(monmsg)) || + (mon_rec_start(monmsg) < mon_dcss_start) || + (mon_rec_end(monmsg) > mon_dcss_end) || + (mon_mca_type(monmsg, 0) == 0) || + (mon_mca_size(monmsg) % 12 != 0) || + (mon_mca_end(monmsg) <= mon_mca_start(monmsg)) || + (mon_mca_end(monmsg) > mon_dcss_end) || + (mon_mca_start(monmsg) < mon_dcss_start) || + ((mon_mca_type(monmsg, 1) == 0) && (mon_mca_type(monmsg, 2) == 0))) + return -EINVAL; + return 0; +} + +static int mon_send_reply(struct mon_msg *monmsg, + struct mon_private *monpriv) +{ + int rc; + + rc = iucv_message_reply(monpriv->path, &monmsg->msg, + IUCV_IPRMDATA, NULL, 0); + atomic_dec(&monpriv->msglim_count); + if (likely(!monmsg->msglim_reached)) { + monmsg->pos = 0; + monmsg->mca_offset = 0; + monpriv->read_index = (monpriv->read_index + 1) % + MON_MSGLIM; + atomic_dec(&monpriv->read_ready); + } else + monmsg->replied_msglim = 1; + if (rc) { + pr_err("Reading monitor data failed with rc=%i\n", rc); + return -EIO; + } + return 0; +} + +static void mon_free_mem(struct mon_private *monpriv) +{ + int i; + + for (i = 0; i < MON_MSGLIM; i++) + kfree(monpriv->msg_array[i]); + kfree(monpriv); +} + +static struct mon_private *mon_alloc_mem(void) +{ + int i; + struct mon_private *monpriv; + + monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL); + if (!monpriv) + return NULL; + for (i = 0; i < MON_MSGLIM; i++) { + monpriv->msg_array[i] = kzalloc(sizeof(struct mon_msg), + GFP_KERNEL); + if (!monpriv->msg_array[i]) { + mon_free_mem(monpriv); + return NULL; + } + } + return monpriv; +} + +static inline void mon_next_mca(struct mon_msg *monmsg) +{ + if (likely((mon_mca_size(monmsg) - monmsg->mca_offset) == 12)) + return; + monmsg->mca_offset += 12; + monmsg->pos = 0; +} + +static struct mon_msg *mon_next_message(struct mon_private *monpriv) +{ + struct mon_msg *monmsg; + + if (!atomic_read(&monpriv->read_ready)) + return NULL; + monmsg = monpriv->msg_array[monpriv->read_index]; + if (unlikely(monmsg->replied_msglim)) { + monmsg->replied_msglim = 0; + monmsg->msglim_reached = 0; + monmsg->pos = 0; + monmsg->mca_offset = 0; + monpriv->read_index = (monpriv->read_index + 1) % + MON_MSGLIM; + atomic_dec(&monpriv->read_ready); + return ERR_PTR(-EOVERFLOW); + } + return monmsg; +} + + +/****************************************************************************** + * IUCV handler * + *****************************************************************************/ +static void mon_iucv_path_complete(struct iucv_path *path, u8 *ipuser) +{ + struct mon_private *monpriv = path->private; + + atomic_set(&monpriv->iucv_connected, 1); + wake_up(&mon_conn_wait_queue); +} + +static void mon_iucv_path_severed(struct iucv_path *path, u8 *ipuser) +{ + struct mon_private *monpriv = path->private; + + pr_err("z/VM *MONITOR system service disconnected with rc=%i\n", + ipuser[0]); + iucv_path_sever(path, NULL); + atomic_set(&monpriv->iucv_severed, 1); + wake_up(&mon_conn_wait_queue); + wake_up_interruptible(&mon_read_wait_queue); +} + +static void mon_iucv_message_pending(struct iucv_path *path, + struct iucv_message *msg) +{ + struct mon_private *monpriv = path->private; + + memcpy(&monpriv->msg_array[monpriv->write_index]->msg, + msg, sizeof(*msg)); + if (atomic_inc_return(&monpriv->msglim_count) == MON_MSGLIM) { + pr_warn("The read queue for monitor data is full\n"); + monpriv->msg_array[monpriv->write_index]->msglim_reached = 1; + } + monpriv->write_index = (monpriv->write_index + 1) % MON_MSGLIM; + atomic_inc(&monpriv->read_ready); + wake_up_interruptible(&mon_read_wait_queue); +} + +static struct iucv_handler monreader_iucv_handler = { + .path_complete = mon_iucv_path_complete, + .path_severed = mon_iucv_path_severed, + .message_pending = mon_iucv_message_pending, +}; + +/****************************************************************************** + * file operations * + *****************************************************************************/ +static int mon_open(struct inode *inode, struct file *filp) +{ + struct mon_private *monpriv; + int rc; + + /* + * only one user allowed + */ + rc = -EBUSY; + if (test_and_set_bit(MON_IN_USE, &mon_in_use)) + goto out; + + rc = -ENOMEM; + monpriv = mon_alloc_mem(); + if (!monpriv) + goto out_use; + + /* + * Connect to *MONITOR service + */ + monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL); + if (!monpriv->path) + goto out_priv; + rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler, + MON_SERVICE, NULL, user_data_connect, monpriv); + if (rc) { + pr_err("Connecting to the z/VM *MONITOR system service " + "failed with rc=%i\n", rc); + rc = -EIO; + goto out_path; + } + /* + * Wait for connection confirmation + */ + wait_event(mon_conn_wait_queue, + atomic_read(&monpriv->iucv_connected) || + atomic_read(&monpriv->iucv_severed)); + if (atomic_read(&monpriv->iucv_severed)) { + atomic_set(&monpriv->iucv_severed, 0); + atomic_set(&monpriv->iucv_connected, 0); + rc = -EIO; + goto out_path; + } + filp->private_data = monpriv; + dev_set_drvdata(monreader_device, monpriv); + return nonseekable_open(inode, filp); + +out_path: + iucv_path_free(monpriv->path); +out_priv: + mon_free_mem(monpriv); +out_use: + clear_bit(MON_IN_USE, &mon_in_use); +out: + return rc; +} + +static int mon_close(struct inode *inode, struct file *filp) +{ + int rc, i; + struct mon_private *monpriv = filp->private_data; + + /* + * Close IUCV connection and unregister + */ + if (monpriv->path) { + rc = iucv_path_sever(monpriv->path, user_data_sever); + if (rc) + pr_warn("Disconnecting the z/VM *MONITOR system service failed with rc=%i\n", + rc); + iucv_path_free(monpriv->path); + } + + atomic_set(&monpriv->iucv_severed, 0); + atomic_set(&monpriv->iucv_connected, 0); + atomic_set(&monpriv->read_ready, 0); + atomic_set(&monpriv->msglim_count, 0); + monpriv->write_index = 0; + monpriv->read_index = 0; + dev_set_drvdata(monreader_device, NULL); + + for (i = 0; i < MON_MSGLIM; i++) + kfree(monpriv->msg_array[i]); + kfree(monpriv); + clear_bit(MON_IN_USE, &mon_in_use); + return 0; +} + +static ssize_t mon_read(struct file *filp, char __user *data, + size_t count, loff_t *ppos) +{ + struct mon_private *monpriv = filp->private_data; + struct mon_msg *monmsg; + int ret; + u32 mce_start; + + monmsg = mon_next_message(monpriv); + if (IS_ERR(monmsg)) + return PTR_ERR(monmsg); + + if (!monmsg) { + if (filp->f_flags & O_NONBLOCK) + return -EAGAIN; + ret = wait_event_interruptible(mon_read_wait_queue, + atomic_read(&monpriv->read_ready) || + atomic_read(&monpriv->iucv_severed)); + if (ret) + return ret; + if (unlikely(atomic_read(&monpriv->iucv_severed))) + return -EIO; + monmsg = monpriv->msg_array[monpriv->read_index]; + } + + if (!monmsg->pos) + monmsg->pos = mon_mca_start(monmsg) + monmsg->mca_offset; + if (mon_check_mca(monmsg)) + goto reply; + + /* read monitor control element (12 bytes) first */ + mce_start = mon_mca_start(monmsg) + monmsg->mca_offset; + if ((monmsg->pos >= mce_start) && (monmsg->pos < mce_start + 12)) { + count = min(count, (size_t) mce_start + 12 - monmsg->pos); + ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos, + count); + if (ret) + return -EFAULT; + monmsg->pos += count; + if (monmsg->pos == mce_start + 12) + monmsg->pos = mon_rec_start(monmsg); + goto out_copy; + } + + /* read records */ + if (monmsg->pos <= mon_rec_end(monmsg)) { + count = min(count, (size_t) mon_rec_end(monmsg) - monmsg->pos + + 1); + ret = copy_to_user(data, (void *) (unsigned long) monmsg->pos, + count); + if (ret) + return -EFAULT; + monmsg->pos += count; + if (monmsg->pos > mon_rec_end(monmsg)) + mon_next_mca(monmsg); + goto out_copy; + } +reply: + ret = mon_send_reply(monmsg, monpriv); + return ret; + +out_copy: + *ppos += count; + return count; +} + +static __poll_t mon_poll(struct file *filp, struct poll_table_struct *p) +{ + struct mon_private *monpriv = filp->private_data; + + poll_wait(filp, &mon_read_wait_queue, p); + if (unlikely(atomic_read(&monpriv->iucv_severed))) + return EPOLLERR; + if (atomic_read(&monpriv->read_ready)) + return EPOLLIN | EPOLLRDNORM; + return 0; +} + +static const struct file_operations mon_fops = { + .owner = THIS_MODULE, + .open = &mon_open, + .release = &mon_close, + .read = &mon_read, + .poll = &mon_poll, + .llseek = noop_llseek, +}; + +static struct miscdevice mon_dev = { + .name = "monreader", + .fops = &mon_fops, + .minor = MISC_DYNAMIC_MINOR, +}; + + +/****************************************************************************** + * suspend / resume * + *****************************************************************************/ +static int monreader_freeze(struct device *dev) +{ + struct mon_private *monpriv = dev_get_drvdata(dev); + int rc; + + if (!monpriv) + return 0; + if (monpriv->path) { + rc = iucv_path_sever(monpriv->path, user_data_sever); + if (rc) + pr_warn("Disconnecting the z/VM *MONITOR system service failed with rc=%i\n", + rc); + iucv_path_free(monpriv->path); + } + atomic_set(&monpriv->iucv_severed, 0); + atomic_set(&monpriv->iucv_connected, 0); + atomic_set(&monpriv->read_ready, 0); + atomic_set(&monpriv->msglim_count, 0); + monpriv->write_index = 0; + monpriv->read_index = 0; + monpriv->path = NULL; + return 0; +} + +static int monreader_thaw(struct device *dev) +{ + struct mon_private *monpriv = dev_get_drvdata(dev); + int rc; + + if (!monpriv) + return 0; + rc = -ENOMEM; + monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL); + if (!monpriv->path) + goto out; + rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler, + MON_SERVICE, NULL, user_data_connect, monpriv); + if (rc) { + pr_err("Connecting to the z/VM *MONITOR system service " + "failed with rc=%i\n", rc); + goto out_path; + } + wait_event(mon_conn_wait_queue, + atomic_read(&monpriv->iucv_connected) || + atomic_read(&monpriv->iucv_severed)); + if (atomic_read(&monpriv->iucv_severed)) + goto out_path; + return 0; +out_path: + rc = -EIO; + iucv_path_free(monpriv->path); + monpriv->path = NULL; +out: + atomic_set(&monpriv->iucv_severed, 1); + return rc; +} + +static int monreader_restore(struct device *dev) +{ + int rc; + + segment_unload(mon_dcss_name); + rc = segment_load(mon_dcss_name, SEGMENT_SHARED, + &mon_dcss_start, &mon_dcss_end); + if (rc < 0) { + segment_warning(rc, mon_dcss_name); + panic("fatal monreader resume error: no monitor dcss\n"); + } + return monreader_thaw(dev); +} + +static const struct dev_pm_ops monreader_pm_ops = { + .freeze = monreader_freeze, + .thaw = monreader_thaw, + .restore = monreader_restore, +}; + +static struct device_driver monreader_driver = { + .name = "monreader", + .bus = &iucv_bus, + .pm = &monreader_pm_ops, +}; + + +/****************************************************************************** + * module init/exit * + *****************************************************************************/ +static int __init mon_init(void) +{ + int rc; + + if (!MACHINE_IS_VM) { + pr_err("The z/VM *MONITOR record device driver cannot be " + "loaded without z/VM\n"); + return -ENODEV; + } + + /* + * Register with IUCV and connect to *MONITOR service + */ + rc = iucv_register(&monreader_iucv_handler, 1); + if (rc) { + pr_err("The z/VM *MONITOR record device driver failed to " + "register with IUCV\n"); + return rc; + } + + rc = driver_register(&monreader_driver); + if (rc) + goto out_iucv; + monreader_device = kzalloc(sizeof(struct device), GFP_KERNEL); + if (!monreader_device) { + rc = -ENOMEM; + goto out_driver; + } + + dev_set_name(monreader_device, "monreader-dev"); + monreader_device->bus = &iucv_bus; + monreader_device->parent = iucv_root; + monreader_device->driver = &monreader_driver; + monreader_device->release = (void (*)(struct device *))kfree; + rc = device_register(monreader_device); + if (rc) { + put_device(monreader_device); + goto out_driver; + } + + rc = segment_type(mon_dcss_name); + if (rc < 0) { + segment_warning(rc, mon_dcss_name); + goto out_device; + } + if (rc != SEG_TYPE_SC) { + pr_err("The specified *MONITOR DCSS %s does not have the " + "required type SC\n", mon_dcss_name); + rc = -EINVAL; + goto out_device; + } + + rc = segment_load(mon_dcss_name, SEGMENT_SHARED, + &mon_dcss_start, &mon_dcss_end); + if (rc < 0) { + segment_warning(rc, mon_dcss_name); + rc = -EINVAL; + goto out_device; + } + dcss_mkname(mon_dcss_name, &user_data_connect[8]); + + /* + * misc_register() has to be the last action in module_init(), because + * file operations will be available right after this. + */ + rc = misc_register(&mon_dev); + if (rc < 0 ) + goto out; + return 0; + +out: + segment_unload(mon_dcss_name); +out_device: + device_unregister(monreader_device); +out_driver: + driver_unregister(&monreader_driver); +out_iucv: + iucv_unregister(&monreader_iucv_handler, 1); + return rc; +} + +static void __exit mon_exit(void) +{ + segment_unload(mon_dcss_name); + misc_deregister(&mon_dev); + device_unregister(monreader_device); + driver_unregister(&monreader_driver); + iucv_unregister(&monreader_iucv_handler, 1); + return; +} + + +module_init(mon_init); +module_exit(mon_exit); + +module_param_string(mondcss, mon_dcss_name, 9, 0444); +MODULE_PARM_DESC(mondcss, "Name of DCSS segment to be used for *MONITOR " + "service, max. 8 chars. Default is MONDCSS"); + +MODULE_AUTHOR("Gerald Schaefer "); +MODULE_DESCRIPTION("Character device driver for reading z/VM " + "monitor service records."); +MODULE_LICENSE("GPL"); diff --git a/drivers/s390/char/monwriter.c b/drivers/s390/char/monwriter.c new file mode 100644 index 000000000..4f1a69c9d --- /dev/null +++ b/drivers/s390/char/monwriter.c @@ -0,0 +1,399 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Character device driver for writing z/VM *MONITOR service records. + * + * Copyright IBM Corp. 2006, 2009 + * + * Author(s): Melissa Howland + */ + +#define KMSG_COMPONENT "monwriter" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MONWRITE_MAX_DATALEN 4010 + +static int mon_max_bufs = 255; +static int mon_buf_count; + +struct mon_buf { + struct list_head list; + struct monwrite_hdr hdr; + int diag_done; + char *data; +}; + +static LIST_HEAD(mon_priv_list); + +struct mon_private { + struct list_head priv_list; + struct list_head list; + struct monwrite_hdr hdr; + size_t hdr_to_read; + size_t data_to_read; + struct mon_buf *current_buf; + struct mutex thread_mutex; +}; + +/* + * helper functions + */ + +static int monwrite_diag(struct monwrite_hdr *myhdr, char *buffer, int fcn) +{ + struct appldata_product_id id; + int rc; + + memcpy(id.prod_nr, "LNXAPPL", 7); + id.prod_fn = myhdr->applid; + id.record_nr = myhdr->record_num; + id.version_nr = myhdr->version; + id.release_nr = myhdr->release; + id.mod_lvl = myhdr->mod_level; + rc = appldata_asm(&id, fcn, (void *) buffer, myhdr->datalen); + if (rc <= 0) + return rc; + pr_err("Writing monitor data failed with rc=%i\n", rc); + if (rc == 5) + return -EPERM; + return -EINVAL; +} + +static struct mon_buf *monwrite_find_hdr(struct mon_private *monpriv, + struct monwrite_hdr *monhdr) +{ + struct mon_buf *entry, *next; + + list_for_each_entry_safe(entry, next, &monpriv->list, list) + if ((entry->hdr.mon_function == monhdr->mon_function || + monhdr->mon_function == MONWRITE_STOP_INTERVAL) && + entry->hdr.applid == monhdr->applid && + entry->hdr.record_num == monhdr->record_num && + entry->hdr.version == monhdr->version && + entry->hdr.release == monhdr->release && + entry->hdr.mod_level == monhdr->mod_level) + return entry; + + return NULL; +} + +static int monwrite_new_hdr(struct mon_private *monpriv) +{ + struct monwrite_hdr *monhdr = &monpriv->hdr; + struct mon_buf *monbuf; + int rc = 0; + + if (monhdr->datalen > MONWRITE_MAX_DATALEN || + monhdr->mon_function > MONWRITE_START_CONFIG || + monhdr->hdrlen != sizeof(struct monwrite_hdr)) + return -EINVAL; + monbuf = NULL; + if (monhdr->mon_function != MONWRITE_GEN_EVENT) + monbuf = monwrite_find_hdr(monpriv, monhdr); + if (monbuf) { + if (monhdr->mon_function == MONWRITE_STOP_INTERVAL) { + monhdr->datalen = monbuf->hdr.datalen; + rc = monwrite_diag(monhdr, monbuf->data, + APPLDATA_STOP_REC); + list_del(&monbuf->list); + mon_buf_count--; + kfree(monbuf->data); + kfree(monbuf); + monbuf = NULL; + } + } else if (monhdr->mon_function != MONWRITE_STOP_INTERVAL) { + if (mon_buf_count >= mon_max_bufs) + return -ENOSPC; + monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL); + if (!monbuf) + return -ENOMEM; + monbuf->data = kzalloc(monhdr->datalen, + GFP_KERNEL | GFP_DMA); + if (!monbuf->data) { + kfree(monbuf); + return -ENOMEM; + } + monbuf->hdr = *monhdr; + list_add_tail(&monbuf->list, &monpriv->list); + if (monhdr->mon_function != MONWRITE_GEN_EVENT) + mon_buf_count++; + } + monpriv->current_buf = monbuf; + return rc; +} + +static int monwrite_new_data(struct mon_private *monpriv) +{ + struct monwrite_hdr *monhdr = &monpriv->hdr; + struct mon_buf *monbuf = monpriv->current_buf; + int rc = 0; + + switch (monhdr->mon_function) { + case MONWRITE_START_INTERVAL: + if (!monbuf->diag_done) { + rc = monwrite_diag(monhdr, monbuf->data, + APPLDATA_START_INTERVAL_REC); + monbuf->diag_done = 1; + } + break; + case MONWRITE_START_CONFIG: + if (!monbuf->diag_done) { + rc = monwrite_diag(monhdr, monbuf->data, + APPLDATA_START_CONFIG_REC); + monbuf->diag_done = 1; + } + break; + case MONWRITE_GEN_EVENT: + rc = monwrite_diag(monhdr, monbuf->data, + APPLDATA_GEN_EVENT_REC); + list_del(&monpriv->current_buf->list); + kfree(monpriv->current_buf->data); + kfree(monpriv->current_buf); + monpriv->current_buf = NULL; + break; + default: + /* monhdr->mon_function is checked in monwrite_new_hdr */ + BUG(); + } + return rc; +} + +/* + * file operations + */ + +static int monwrite_open(struct inode *inode, struct file *filp) +{ + struct mon_private *monpriv; + + monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL); + if (!monpriv) + return -ENOMEM; + INIT_LIST_HEAD(&monpriv->list); + monpriv->hdr_to_read = sizeof(monpriv->hdr); + mutex_init(&monpriv->thread_mutex); + filp->private_data = monpriv; + list_add_tail(&monpriv->priv_list, &mon_priv_list); + return nonseekable_open(inode, filp); +} + +static int monwrite_close(struct inode *inode, struct file *filp) +{ + struct mon_private *monpriv = filp->private_data; + struct mon_buf *entry, *next; + + list_for_each_entry_safe(entry, next, &monpriv->list, list) { + if (entry->hdr.mon_function != MONWRITE_GEN_EVENT) + monwrite_diag(&entry->hdr, entry->data, + APPLDATA_STOP_REC); + mon_buf_count--; + list_del(&entry->list); + kfree(entry->data); + kfree(entry); + } + list_del(&monpriv->priv_list); + kfree(monpriv); + return 0; +} + +static ssize_t monwrite_write(struct file *filp, const char __user *data, + size_t count, loff_t *ppos) +{ + struct mon_private *monpriv = filp->private_data; + size_t len, written; + void *to; + int rc; + + mutex_lock(&monpriv->thread_mutex); + for (written = 0; written < count; ) { + if (monpriv->hdr_to_read) { + len = min(count - written, monpriv->hdr_to_read); + to = (char *) &monpriv->hdr + + sizeof(monpriv->hdr) - monpriv->hdr_to_read; + if (copy_from_user(to, data + written, len)) { + rc = -EFAULT; + goto out_error; + } + monpriv->hdr_to_read -= len; + written += len; + if (monpriv->hdr_to_read > 0) + continue; + rc = monwrite_new_hdr(monpriv); + if (rc) + goto out_error; + monpriv->data_to_read = monpriv->current_buf ? + monpriv->current_buf->hdr.datalen : 0; + } + + if (monpriv->data_to_read) { + len = min(count - written, monpriv->data_to_read); + to = monpriv->current_buf->data + + monpriv->hdr.datalen - monpriv->data_to_read; + if (copy_from_user(to, data + written, len)) { + rc = -EFAULT; + goto out_error; + } + monpriv->data_to_read -= len; + written += len; + if (monpriv->data_to_read > 0) + continue; + rc = monwrite_new_data(monpriv); + if (rc) + goto out_error; + } + monpriv->hdr_to_read = sizeof(monpriv->hdr); + } + mutex_unlock(&monpriv->thread_mutex); + return written; + +out_error: + monpriv->data_to_read = 0; + monpriv->hdr_to_read = sizeof(struct monwrite_hdr); + mutex_unlock(&monpriv->thread_mutex); + return rc; +} + +static const struct file_operations monwrite_fops = { + .owner = THIS_MODULE, + .open = &monwrite_open, + .release = &monwrite_close, + .write = &monwrite_write, + .llseek = noop_llseek, +}; + +static struct miscdevice mon_dev = { + .name = "monwriter", + .fops = &monwrite_fops, + .minor = MISC_DYNAMIC_MINOR, +}; + +/* + * suspend/resume + */ + +static int monwriter_freeze(struct device *dev) +{ + struct mon_private *monpriv; + struct mon_buf *monbuf; + + list_for_each_entry(monpriv, &mon_priv_list, priv_list) { + list_for_each_entry(monbuf, &monpriv->list, list) { + if (monbuf->hdr.mon_function != MONWRITE_GEN_EVENT) + monwrite_diag(&monbuf->hdr, monbuf->data, + APPLDATA_STOP_REC); + } + } + return 0; +} + +static int monwriter_restore(struct device *dev) +{ + struct mon_private *monpriv; + struct mon_buf *monbuf; + + list_for_each_entry(monpriv, &mon_priv_list, priv_list) { + list_for_each_entry(monbuf, &monpriv->list, list) { + if (monbuf->hdr.mon_function == MONWRITE_START_INTERVAL) + monwrite_diag(&monbuf->hdr, monbuf->data, + APPLDATA_START_INTERVAL_REC); + if (monbuf->hdr.mon_function == MONWRITE_START_CONFIG) + monwrite_diag(&monbuf->hdr, monbuf->data, + APPLDATA_START_CONFIG_REC); + } + } + return 0; +} + +static int monwriter_thaw(struct device *dev) +{ + return monwriter_restore(dev); +} + +static const struct dev_pm_ops monwriter_pm_ops = { + .freeze = monwriter_freeze, + .thaw = monwriter_thaw, + .restore = monwriter_restore, +}; + +static struct platform_driver monwriter_pdrv = { + .driver = { + .name = "monwriter", + .pm = &monwriter_pm_ops, + }, +}; + +static struct platform_device *monwriter_pdev; + +/* + * module init/exit + */ + +static int __init mon_init(void) +{ + int rc; + + if (!MACHINE_IS_VM) + return -ENODEV; + + rc = platform_driver_register(&monwriter_pdrv); + if (rc) + return rc; + + monwriter_pdev = platform_device_register_simple("monwriter", -1, NULL, + 0); + if (IS_ERR(monwriter_pdev)) { + rc = PTR_ERR(monwriter_pdev); + goto out_driver; + } + + /* + * misc_register() has to be the last action in module_init(), because + * file operations will be available right after this. + */ + rc = misc_register(&mon_dev); + if (rc) + goto out_device; + return 0; + +out_device: + platform_device_unregister(monwriter_pdev); +out_driver: + platform_driver_unregister(&monwriter_pdrv); + return rc; +} + +static void __exit mon_exit(void) +{ + misc_deregister(&mon_dev); + platform_device_unregister(monwriter_pdev); + platform_driver_unregister(&monwriter_pdrv); +} + +module_init(mon_init); +module_exit(mon_exit); + +module_param_named(max_bufs, mon_max_bufs, int, 0644); +MODULE_PARM_DESC(max_bufs, "Maximum number of sample monitor data buffers " + "that can be active at one time"); + +MODULE_AUTHOR("Melissa Howland "); +MODULE_DESCRIPTION("Character device driver for writing z/VM " + "APPLDATA monitor records."); +MODULE_LICENSE("GPL"); diff --git a/drivers/s390/char/raw3270.c b/drivers/s390/char/raw3270.c new file mode 100644 index 000000000..63a41b168 --- /dev/null +++ b/drivers/s390/char/raw3270.c @@ -0,0 +1,1358 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * IBM/3270 Driver - core functions. + * + * Author(s): + * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global) + * Rewritten for 2.5 by Martin Schwidefsky + * Copyright IBM Corp. 2003, 2009 + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "raw3270.h" + +#include +#include +#include +#include + +struct class *class3270; + +/* The main 3270 data structure. */ +struct raw3270 { + struct list_head list; + struct ccw_device *cdev; + int minor; + + short model, rows, cols; + unsigned int state; + unsigned long flags; + + struct list_head req_queue; /* Request queue. */ + struct list_head view_list; /* List of available views. */ + struct raw3270_view *view; /* Active view. */ + + struct timer_list timer; /* Device timer. */ + + unsigned char *ascebc; /* ascii -> ebcdic table */ + + struct raw3270_view init_view; + struct raw3270_request init_reset; + struct raw3270_request init_readpart; + struct raw3270_request init_readmod; + unsigned char init_data[256]; +}; + +/* raw3270->state */ +#define RAW3270_STATE_INIT 0 /* Initial state */ +#define RAW3270_STATE_RESET 1 /* Reset command is pending */ +#define RAW3270_STATE_W4ATTN 2 /* Wait for attention interrupt */ +#define RAW3270_STATE_READMOD 3 /* Read partition is pending */ +#define RAW3270_STATE_READY 4 /* Device is usable by views */ + +/* raw3270->flags */ +#define RAW3270_FLAGS_14BITADDR 0 /* 14-bit buffer addresses */ +#define RAW3270_FLAGS_BUSY 1 /* Device busy, leave it alone */ +#define RAW3270_FLAGS_CONSOLE 2 /* Device is the console. */ +#define RAW3270_FLAGS_FROZEN 3 /* set if 3270 is frozen for suspend */ + +/* Semaphore to protect global data of raw3270 (devices, views, etc). */ +static DEFINE_MUTEX(raw3270_mutex); + +/* List of 3270 devices. */ +static LIST_HEAD(raw3270_devices); + +/* + * Flag to indicate if the driver has been registered. Some operations + * like waiting for the end of i/o need to be done differently as long + * as the kernel is still starting up (console support). + */ +static int raw3270_registered; + +/* Module parameters */ +static bool tubxcorrect; +module_param(tubxcorrect, bool, 0); + +/* + * Wait queue for device init/delete, view delete. + */ +DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue); + +static void __raw3270_disconnect(struct raw3270 *rp); + +/* + * Encode array for 12 bit 3270 addresses. + */ +static unsigned char raw3270_ebcgraf[64] = { + 0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, + 0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, + 0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, + 0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, + 0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, + 0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, + 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, + 0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f +}; + +static inline int raw3270_state_ready(struct raw3270 *rp) +{ + return rp->state == RAW3270_STATE_READY; +} + +static inline int raw3270_state_final(struct raw3270 *rp) +{ + return rp->state == RAW3270_STATE_INIT || + rp->state == RAW3270_STATE_READY; +} + +void +raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr) +{ + if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) { + cp[0] = (addr >> 8) & 0x3f; + cp[1] = addr & 0xff; + } else { + cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f]; + cp[1] = raw3270_ebcgraf[addr & 0x3f]; + } +} + +/* + * Allocate a new 3270 ccw request + */ +struct raw3270_request * +raw3270_request_alloc(size_t size) +{ + struct raw3270_request *rq; + + /* Allocate request structure */ + rq = kzalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA); + if (!rq) + return ERR_PTR(-ENOMEM); + + /* alloc output buffer. */ + if (size > 0) { + rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA); + if (!rq->buffer) { + kfree(rq); + return ERR_PTR(-ENOMEM); + } + } + rq->size = size; + INIT_LIST_HEAD(&rq->list); + + /* + * Setup ccw. + */ + rq->ccw.cda = __pa(rq->buffer); + rq->ccw.flags = CCW_FLAG_SLI; + + return rq; +} + +/* + * Free 3270 ccw request + */ +void +raw3270_request_free (struct raw3270_request *rq) +{ + kfree(rq->buffer); + kfree(rq); +} + +/* + * Reset request to initial state. + */ +void +raw3270_request_reset(struct raw3270_request *rq) +{ + BUG_ON(!list_empty(&rq->list)); + rq->ccw.cmd_code = 0; + rq->ccw.count = 0; + rq->ccw.cda = __pa(rq->buffer); + rq->ccw.flags = CCW_FLAG_SLI; + rq->rescnt = 0; + rq->rc = 0; +} + +/* + * Set command code to ccw of a request. + */ +void +raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd) +{ + rq->ccw.cmd_code = cmd; +} + +/* + * Add data fragment to output buffer. + */ +int +raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size) +{ + if (size + rq->ccw.count > rq->size) + return -E2BIG; + memcpy(rq->buffer + rq->ccw.count, data, size); + rq->ccw.count += size; + return 0; +} + +/* + * Set address/length pair to ccw of a request. + */ +void +raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size) +{ + rq->ccw.cda = __pa(data); + rq->ccw.count = size; +} + +/* + * Set idal buffer to ccw of a request. + */ +void +raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib) +{ + rq->ccw.cda = __pa(ib->data); + rq->ccw.count = ib->size; + rq->ccw.flags |= CCW_FLAG_IDA; +} + +/* + * Add the request to the request queue, try to start it if the + * 3270 device is idle. Return without waiting for end of i/o. + */ +static int +__raw3270_start(struct raw3270 *rp, struct raw3270_view *view, + struct raw3270_request *rq) +{ + rq->view = view; + raw3270_get_view(view); + if (list_empty(&rp->req_queue) && + !test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) { + /* No other requests are on the queue. Start this one. */ + rq->rc = ccw_device_start(rp->cdev, &rq->ccw, + (unsigned long) rq, 0, 0); + if (rq->rc) { + raw3270_put_view(view); + return rq->rc; + } + } + list_add_tail(&rq->list, &rp->req_queue); + return 0; +} + +int +raw3270_view_active(struct raw3270_view *view) +{ + struct raw3270 *rp = view->dev; + + return rp && rp->view == view && + !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags); +} + +int +raw3270_start(struct raw3270_view *view, struct raw3270_request *rq) +{ + unsigned long flags; + struct raw3270 *rp; + int rc; + + spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags); + rp = view->dev; + if (!rp || rp->view != view || + test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) + rc = -EACCES; + else if (!raw3270_state_ready(rp)) + rc = -EBUSY; + else + rc = __raw3270_start(rp, view, rq); + spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags); + return rc; +} + +int +raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq) +{ + struct raw3270 *rp; + int rc; + + rp = view->dev; + if (!rp || rp->view != view || + test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) + rc = -EACCES; + else if (!raw3270_state_ready(rp)) + rc = -EBUSY; + else + rc = __raw3270_start(rp, view, rq); + return rc; +} + +int +raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq) +{ + struct raw3270 *rp; + + rp = view->dev; + rq->view = view; + raw3270_get_view(view); + list_add_tail(&rq->list, &rp->req_queue); + return 0; +} + +/* + * 3270 interrupt routine, called from the ccw_device layer + */ +static void +raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) +{ + struct raw3270 *rp; + struct raw3270_view *view; + struct raw3270_request *rq; + + rp = dev_get_drvdata(&cdev->dev); + if (!rp) + return; + rq = (struct raw3270_request *) intparm; + view = rq ? rq->view : rp->view; + + if (!IS_ERR(irb)) { + /* Handle CE-DE-UE and subsequent UDE */ + if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) + clear_bit(RAW3270_FLAGS_BUSY, &rp->flags); + if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | + DEV_STAT_DEV_END | + DEV_STAT_UNIT_EXCEP)) + set_bit(RAW3270_FLAGS_BUSY, &rp->flags); + /* Handle disconnected devices */ + if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && + (irb->ecw[0] & SNS0_INTERVENTION_REQ)) { + set_bit(RAW3270_FLAGS_BUSY, &rp->flags); + if (rp->state > RAW3270_STATE_RESET) + __raw3270_disconnect(rp); + } + /* Call interrupt handler of the view */ + if (view) + view->fn->intv(view, rq, irb); + } + + if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) + /* Device busy, do not start I/O */ + return; + + if (rq && !list_empty(&rq->list)) { + /* The request completed, remove from queue and do callback. */ + list_del_init(&rq->list); + if (rq->callback) + rq->callback(rq, rq->callback_data); + /* Do put_device for get_device in raw3270_start. */ + raw3270_put_view(view); + } + + /* + * Try to start each request on request queue until one is + * started successful. + */ + while (!list_empty(&rp->req_queue)) { + rq = list_entry(rp->req_queue.next,struct raw3270_request,list); + rq->rc = ccw_device_start(rp->cdev, &rq->ccw, + (unsigned long) rq, 0, 0); + if (rq->rc == 0) + break; + /* Start failed. Remove request and do callback. */ + list_del_init(&rq->list); + if (rq->callback) + rq->callback(rq, rq->callback_data); + /* Do put_device for get_device in raw3270_start. */ + raw3270_put_view(view); + } +} + +/* + * To determine the size of the 3270 device we need to do: + * 1) send a 'read partition' data stream to the device + * 2) wait for the attn interrupt that precedes the query reply + * 3) do a read modified to get the query reply + * To make things worse we have to cope with intervention + * required (3270 device switched to 'stand-by') and command + * rejects (old devices that can't do 'read partition'). + */ +struct raw3270_ua { /* Query Reply structure for Usable Area */ + struct { /* Usable Area Query Reply Base */ + short l; /* Length of this structured field */ + char sfid; /* 0x81 if Query Reply */ + char qcode; /* 0x81 if Usable Area */ + char flags0; + char flags1; + short w; /* Width of usable area */ + short h; /* Heigth of usavle area */ + char units; /* 0x00:in; 0x01:mm */ + int xr; + int yr; + char aw; + char ah; + short buffsz; /* Character buffer size, bytes */ + char xmin; + char ymin; + char xmax; + char ymax; + } __attribute__ ((packed)) uab; + struct { /* Alternate Usable Area Self-Defining Parameter */ + char l; /* Length of this Self-Defining Parm */ + char sdpid; /* 0x02 if Alternate Usable Area */ + char res; + char auaid; /* 0x01 is Id for the A U A */ + short wauai; /* Width of AUAi */ + short hauai; /* Height of AUAi */ + char auaunits; /* 0x00:in, 0x01:mm */ + int auaxr; + int auayr; + char awauai; + char ahauai; + } __attribute__ ((packed)) aua; +} __attribute__ ((packed)); + +static void +raw3270_size_device_vm(struct raw3270 *rp) +{ + int rc, model; + struct ccw_dev_id dev_id; + struct diag210 diag_data; + + ccw_device_get_id(rp->cdev, &dev_id); + diag_data.vrdcdvno = dev_id.devno; + diag_data.vrdclen = sizeof(struct diag210); + rc = diag210(&diag_data); + model = diag_data.vrdccrmd; + /* Use default model 2 if the size could not be detected */ + if (rc || model < 2 || model > 5) + model = 2; + switch (model) { + case 2: + rp->model = model; + rp->rows = 24; + rp->cols = 80; + break; + case 3: + rp->model = model; + rp->rows = 32; + rp->cols = 80; + break; + case 4: + rp->model = model; + rp->rows = 43; + rp->cols = 80; + break; + case 5: + rp->model = model; + rp->rows = 27; + rp->cols = 132; + break; + } +} + +static void +raw3270_size_device(struct raw3270 *rp) +{ + struct raw3270_ua *uap; + + /* Got a Query Reply */ + uap = (struct raw3270_ua *) (rp->init_data + 1); + /* Paranoia check. */ + if (rp->init_readmod.rc || rp->init_data[0] != 0x88 || + uap->uab.qcode != 0x81) { + /* Couldn't detect size. Use default model 2. */ + rp->model = 2; + rp->rows = 24; + rp->cols = 80; + return; + } + /* Copy rows/columns of default Usable Area */ + rp->rows = uap->uab.h; + rp->cols = uap->uab.w; + /* Check for 14 bit addressing */ + if ((uap->uab.flags0 & 0x0d) == 0x01) + set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags); + /* Check for Alternate Usable Area */ + if (uap->uab.l == sizeof(struct raw3270_ua) && + uap->aua.sdpid == 0x02) { + rp->rows = uap->aua.hauai; + rp->cols = uap->aua.wauai; + } + /* Try to find a model. */ + rp->model = 0; + if (rp->rows == 24 && rp->cols == 80) + rp->model = 2; + if (rp->rows == 32 && rp->cols == 80) + rp->model = 3; + if (rp->rows == 43 && rp->cols == 80) + rp->model = 4; + if (rp->rows == 27 && rp->cols == 132) + rp->model = 5; +} + +static void +raw3270_size_device_done(struct raw3270 *rp) +{ + struct raw3270_view *view; + + rp->view = NULL; + rp->state = RAW3270_STATE_READY; + /* Notify views about new size */ + list_for_each_entry(view, &rp->view_list, list) + if (view->fn->resize) + view->fn->resize(view, rp->model, rp->rows, rp->cols); + /* Setup processing done, now activate a view */ + list_for_each_entry(view, &rp->view_list, list) { + rp->view = view; + if (view->fn->activate(view) == 0) + break; + rp->view = NULL; + } +} + +static void +raw3270_read_modified_cb(struct raw3270_request *rq, void *data) +{ + struct raw3270 *rp = rq->view->dev; + + raw3270_size_device(rp); + raw3270_size_device_done(rp); +} + +static void +raw3270_read_modified(struct raw3270 *rp) +{ + if (rp->state != RAW3270_STATE_W4ATTN) + return; + /* Use 'read modified' to get the result of a read partition. */ + memset(&rp->init_readmod, 0, sizeof(rp->init_readmod)); + memset(&rp->init_data, 0, sizeof(rp->init_data)); + rp->init_readmod.ccw.cmd_code = TC_READMOD; + rp->init_readmod.ccw.flags = CCW_FLAG_SLI; + rp->init_readmod.ccw.count = sizeof(rp->init_data); + rp->init_readmod.ccw.cda = (__u32) __pa(rp->init_data); + rp->init_readmod.callback = raw3270_read_modified_cb; + rp->state = RAW3270_STATE_READMOD; + raw3270_start_irq(&rp->init_view, &rp->init_readmod); +} + +static void +raw3270_writesf_readpart(struct raw3270 *rp) +{ + static const unsigned char wbuf[] = + { 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 }; + + /* Store 'read partition' data stream to init_data */ + memset(&rp->init_readpart, 0, sizeof(rp->init_readpart)); + memset(&rp->init_data, 0, sizeof(rp->init_data)); + memcpy(&rp->init_data, wbuf, sizeof(wbuf)); + rp->init_readpart.ccw.cmd_code = TC_WRITESF; + rp->init_readpart.ccw.flags = CCW_FLAG_SLI; + rp->init_readpart.ccw.count = sizeof(wbuf); + rp->init_readpart.ccw.cda = (__u32) __pa(&rp->init_data); + rp->state = RAW3270_STATE_W4ATTN; + raw3270_start_irq(&rp->init_view, &rp->init_readpart); +} + +/* + * Device reset + */ +static void +raw3270_reset_device_cb(struct raw3270_request *rq, void *data) +{ + struct raw3270 *rp = rq->view->dev; + + if (rp->state != RAW3270_STATE_RESET) + return; + if (rq->rc) { + /* Reset command failed. */ + rp->state = RAW3270_STATE_INIT; + } else if (MACHINE_IS_VM) { + raw3270_size_device_vm(rp); + raw3270_size_device_done(rp); + } else + raw3270_writesf_readpart(rp); + memset(&rp->init_reset, 0, sizeof(rp->init_reset)); +} + +static int +__raw3270_reset_device(struct raw3270 *rp) +{ + int rc; + + /* Check if reset is already pending */ + if (rp->init_reset.view) + return -EBUSY; + /* Store reset data stream to init_data/init_reset */ + rp->init_data[0] = TW_KR; + rp->init_reset.ccw.cmd_code = TC_EWRITEA; + rp->init_reset.ccw.flags = CCW_FLAG_SLI; + rp->init_reset.ccw.count = 1; + rp->init_reset.ccw.cda = (__u32) __pa(rp->init_data); + rp->init_reset.callback = raw3270_reset_device_cb; + rc = __raw3270_start(rp, &rp->init_view, &rp->init_reset); + if (rc == 0 && rp->state == RAW3270_STATE_INIT) + rp->state = RAW3270_STATE_RESET; + return rc; +} + +static int +raw3270_reset_device(struct raw3270 *rp) +{ + unsigned long flags; + int rc; + + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + rc = __raw3270_reset_device(rp); + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + return rc; +} + +int +raw3270_reset(struct raw3270_view *view) +{ + struct raw3270 *rp; + int rc; + + rp = view->dev; + if (!rp || rp->view != view || + test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) + rc = -EACCES; + else if (!raw3270_state_ready(rp)) + rc = -EBUSY; + else + rc = raw3270_reset_device(view->dev); + return rc; +} + +static void +__raw3270_disconnect(struct raw3270 *rp) +{ + struct raw3270_request *rq; + struct raw3270_view *view; + + rp->state = RAW3270_STATE_INIT; + rp->view = &rp->init_view; + /* Cancel all queued requests */ + while (!list_empty(&rp->req_queue)) { + rq = list_entry(rp->req_queue.next,struct raw3270_request,list); + view = rq->view; + rq->rc = -EACCES; + list_del_init(&rq->list); + if (rq->callback) + rq->callback(rq, rq->callback_data); + raw3270_put_view(view); + } + /* Start from scratch */ + __raw3270_reset_device(rp); +} + +static void +raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq, + struct irb *irb) +{ + struct raw3270 *rp; + + if (rq) { + if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { + if (irb->ecw[0] & SNS0_CMD_REJECT) + rq->rc = -EOPNOTSUPP; + else + rq->rc = -EIO; + } + } + if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { + /* Queue read modified after attention interrupt */ + rp = view->dev; + raw3270_read_modified(rp); + } +} + +static struct raw3270_fn raw3270_init_fn = { + .intv = raw3270_init_irq +}; + +/* + * Setup new 3270 device. + */ +static int +raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc) +{ + struct list_head *l; + struct raw3270 *tmp; + int minor; + + memset(rp, 0, sizeof(struct raw3270)); + /* Copy ebcdic -> ascii translation table. */ + memcpy(ascebc, _ascebc, 256); + if (tubxcorrect) { + /* correct brackets and circumflex */ + ascebc['['] = 0xad; + ascebc[']'] = 0xbd; + ascebc['^'] = 0xb0; + } + rp->ascebc = ascebc; + + /* Set defaults. */ + rp->rows = 24; + rp->cols = 80; + + INIT_LIST_HEAD(&rp->req_queue); + INIT_LIST_HEAD(&rp->view_list); + + rp->init_view.dev = rp; + rp->init_view.fn = &raw3270_init_fn; + rp->view = &rp->init_view; + + /* + * Add device to list and find the smallest unused minor + * number for it. Note: there is no device with minor 0, + * see special case for fs3270.c:fs3270_open(). + */ + mutex_lock(&raw3270_mutex); + /* Keep the list sorted. */ + minor = RAW3270_FIRSTMINOR; + rp->minor = -1; + list_for_each(l, &raw3270_devices) { + tmp = list_entry(l, struct raw3270, list); + if (tmp->minor > minor) { + rp->minor = minor; + __list_add(&rp->list, l->prev, l); + break; + } + minor++; + } + if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) { + rp->minor = minor; + list_add_tail(&rp->list, &raw3270_devices); + } + mutex_unlock(&raw3270_mutex); + /* No free minor number? Then give up. */ + if (rp->minor == -1) + return -EUSERS; + rp->cdev = cdev; + dev_set_drvdata(&cdev->dev, rp); + cdev->handler = raw3270_irq; + return 0; +} + +#ifdef CONFIG_TN3270_CONSOLE +/* Tentative definition - see below for actual definition. */ +static struct ccw_driver raw3270_ccw_driver; + +/* + * Setup 3270 device configured as console. + */ +struct raw3270 __init *raw3270_setup_console(void) +{ + struct ccw_device *cdev; + unsigned long flags; + struct raw3270 *rp; + char *ascebc; + int rc; + + cdev = ccw_device_create_console(&raw3270_ccw_driver); + if (IS_ERR(cdev)) + return ERR_CAST(cdev); + + rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA); + ascebc = kzalloc(256, GFP_KERNEL); + rc = raw3270_setup_device(cdev, rp, ascebc); + if (rc) + return ERR_PTR(rc); + set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags); + + rc = ccw_device_enable_console(cdev); + if (rc) { + ccw_device_destroy_console(cdev); + return ERR_PTR(rc); + } + + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + do { + __raw3270_reset_device(rp); + while (!raw3270_state_final(rp)) { + ccw_device_wait_idle(rp->cdev); + barrier(); + } + } while (rp->state != RAW3270_STATE_READY); + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + return rp; +} + +void +raw3270_wait_cons_dev(struct raw3270 *rp) +{ + unsigned long flags; + + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + ccw_device_wait_idle(rp->cdev); + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); +} + +#endif + +/* + * Create a 3270 device structure. + */ +static struct raw3270 * +raw3270_create_device(struct ccw_device *cdev) +{ + struct raw3270 *rp; + char *ascebc; + int rc; + + rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA); + if (!rp) + return ERR_PTR(-ENOMEM); + ascebc = kmalloc(256, GFP_KERNEL); + if (!ascebc) { + kfree(rp); + return ERR_PTR(-ENOMEM); + } + rc = raw3270_setup_device(cdev, rp, ascebc); + if (rc) { + kfree(rp->ascebc); + kfree(rp); + rp = ERR_PTR(rc); + } + /* Get reference to ccw_device structure. */ + get_device(&cdev->dev); + return rp; +} + +/* + * Activate a view. + */ +int +raw3270_activate_view(struct raw3270_view *view) +{ + struct raw3270 *rp; + struct raw3270_view *oldview, *nv; + unsigned long flags; + int rc; + + rp = view->dev; + if (!rp) + return -ENODEV; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + if (rp->view == view) + rc = 0; + else if (!raw3270_state_ready(rp)) + rc = -EBUSY; + else if (test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) + rc = -EACCES; + else { + oldview = NULL; + if (rp->view && rp->view->fn->deactivate) { + oldview = rp->view; + oldview->fn->deactivate(oldview); + } + rp->view = view; + rc = view->fn->activate(view); + if (rc) { + /* Didn't work. Try to reactivate the old view. */ + rp->view = oldview; + if (!oldview || oldview->fn->activate(oldview) != 0) { + /* Didn't work as well. Try any other view. */ + list_for_each_entry(nv, &rp->view_list, list) + if (nv != view && nv != oldview) { + rp->view = nv; + if (nv->fn->activate(nv) == 0) + break; + rp->view = NULL; + } + } + } + } + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + return rc; +} + +/* + * Deactivate current view. + */ +void +raw3270_deactivate_view(struct raw3270_view *view) +{ + unsigned long flags; + struct raw3270 *rp; + + rp = view->dev; + if (!rp) + return; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + if (rp->view == view) { + view->fn->deactivate(view); + rp->view = NULL; + /* Move deactivated view to end of list. */ + list_del_init(&view->list); + list_add_tail(&view->list, &rp->view_list); + /* Try to activate another view. */ + if (raw3270_state_ready(rp) && + !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) { + list_for_each_entry(view, &rp->view_list, list) { + rp->view = view; + if (view->fn->activate(view) == 0) + break; + rp->view = NULL; + } + } + } + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); +} + +/* + * Add view to device with minor "minor". + */ +int +raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor, int subclass) +{ + unsigned long flags; + struct raw3270 *rp; + int rc; + + if (minor <= 0) + return -ENODEV; + mutex_lock(&raw3270_mutex); + rc = -ENODEV; + list_for_each_entry(rp, &raw3270_devices, list) { + if (rp->minor != minor) + continue; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + atomic_set(&view->ref_count, 2); + view->dev = rp; + view->fn = fn; + view->model = rp->model; + view->rows = rp->rows; + view->cols = rp->cols; + view->ascebc = rp->ascebc; + spin_lock_init(&view->lock); + lockdep_set_subclass(&view->lock, subclass); + list_add(&view->list, &rp->view_list); + rc = 0; + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + break; + } + mutex_unlock(&raw3270_mutex); + return rc; +} + +/* + * Find specific view of device with minor "minor". + */ +struct raw3270_view * +raw3270_find_view(struct raw3270_fn *fn, int minor) +{ + struct raw3270 *rp; + struct raw3270_view *view, *tmp; + unsigned long flags; + + mutex_lock(&raw3270_mutex); + view = ERR_PTR(-ENODEV); + list_for_each_entry(rp, &raw3270_devices, list) { + if (rp->minor != minor) + continue; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + list_for_each_entry(tmp, &rp->view_list, list) { + if (tmp->fn == fn) { + raw3270_get_view(tmp); + view = tmp; + break; + } + } + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + break; + } + mutex_unlock(&raw3270_mutex); + return view; +} + +/* + * Remove view from device and free view structure via call to view->fn->free. + */ +void +raw3270_del_view(struct raw3270_view *view) +{ + unsigned long flags; + struct raw3270 *rp; + struct raw3270_view *nv; + + rp = view->dev; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + if (rp->view == view) { + view->fn->deactivate(view); + rp->view = NULL; + } + list_del_init(&view->list); + if (!rp->view && raw3270_state_ready(rp) && + !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) { + /* Try to activate another view. */ + list_for_each_entry(nv, &rp->view_list, list) { + if (nv->fn->activate(nv) == 0) { + rp->view = nv; + break; + } + } + } + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + /* Wait for reference counter to drop to zero. */ + atomic_dec(&view->ref_count); + wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0); + if (view->fn->free) + view->fn->free(view); +} + +/* + * Remove a 3270 device structure. + */ +static void +raw3270_delete_device(struct raw3270 *rp) +{ + struct ccw_device *cdev; + + /* Remove from device chain. */ + mutex_lock(&raw3270_mutex); + list_del_init(&rp->list); + mutex_unlock(&raw3270_mutex); + + /* Disconnect from ccw_device. */ + cdev = rp->cdev; + rp->cdev = NULL; + dev_set_drvdata(&cdev->dev, NULL); + cdev->handler = NULL; + + /* Put ccw_device structure. */ + put_device(&cdev->dev); + + /* Now free raw3270 structure. */ + kfree(rp->ascebc); + kfree(rp); +} + +static int +raw3270_probe (struct ccw_device *cdev) +{ + return 0; +} + +/* + * Additional attributes for a 3270 device + */ +static ssize_t +raw3270_model_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%i\n", + ((struct raw3270 *) dev_get_drvdata(dev))->model); +} +static DEVICE_ATTR(model, 0444, raw3270_model_show, NULL); + +static ssize_t +raw3270_rows_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%i\n", + ((struct raw3270 *) dev_get_drvdata(dev))->rows); +} +static DEVICE_ATTR(rows, 0444, raw3270_rows_show, NULL); + +static ssize_t +raw3270_columns_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%i\n", + ((struct raw3270 *) dev_get_drvdata(dev))->cols); +} +static DEVICE_ATTR(columns, 0444, raw3270_columns_show, NULL); + +static struct attribute * raw3270_attrs[] = { + &dev_attr_model.attr, + &dev_attr_rows.attr, + &dev_attr_columns.attr, + NULL, +}; + +static const struct attribute_group raw3270_attr_group = { + .attrs = raw3270_attrs, +}; + +static int raw3270_create_attributes(struct raw3270 *rp) +{ + return sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group); +} + +/* + * Notifier for device addition/removal + */ +static LIST_HEAD(raw3270_notifier); + +int raw3270_register_notifier(struct raw3270_notifier *notifier) +{ + struct raw3270 *rp; + + mutex_lock(&raw3270_mutex); + list_add_tail(¬ifier->list, &raw3270_notifier); + list_for_each_entry(rp, &raw3270_devices, list) + notifier->create(rp->minor); + mutex_unlock(&raw3270_mutex); + return 0; +} + +void raw3270_unregister_notifier(struct raw3270_notifier *notifier) +{ + struct raw3270 *rp; + + mutex_lock(&raw3270_mutex); + list_for_each_entry(rp, &raw3270_devices, list) + notifier->destroy(rp->minor); + list_del(¬ifier->list); + mutex_unlock(&raw3270_mutex); +} + +/* + * Set 3270 device online. + */ +static int +raw3270_set_online (struct ccw_device *cdev) +{ + struct raw3270_notifier *np; + struct raw3270 *rp; + int rc; + + rp = raw3270_create_device(cdev); + if (IS_ERR(rp)) + return PTR_ERR(rp); + rc = raw3270_create_attributes(rp); + if (rc) + goto failure; + raw3270_reset_device(rp); + mutex_lock(&raw3270_mutex); + list_for_each_entry(np, &raw3270_notifier, list) + np->create(rp->minor); + mutex_unlock(&raw3270_mutex); + return 0; + +failure: + raw3270_delete_device(rp); + return rc; +} + +/* + * Remove 3270 device structure. + */ +static void +raw3270_remove (struct ccw_device *cdev) +{ + unsigned long flags; + struct raw3270 *rp; + struct raw3270_view *v; + struct raw3270_notifier *np; + + rp = dev_get_drvdata(&cdev->dev); + /* + * _remove is the opposite of _probe; it's probe that + * should set up rp. raw3270_remove gets entered for + * devices even if they haven't been varied online. + * Thus, rp may validly be NULL here. + */ + if (rp == NULL) + return; + + sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group); + + /* Deactivate current view and remove all views. */ + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + if (rp->view) { + if (rp->view->fn->deactivate) + rp->view->fn->deactivate(rp->view); + rp->view = NULL; + } + while (!list_empty(&rp->view_list)) { + v = list_entry(rp->view_list.next, struct raw3270_view, list); + if (v->fn->release) + v->fn->release(v); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + raw3270_del_view(v); + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + } + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + + mutex_lock(&raw3270_mutex); + list_for_each_entry(np, &raw3270_notifier, list) + np->destroy(rp->minor); + mutex_unlock(&raw3270_mutex); + + /* Reset 3270 device. */ + raw3270_reset_device(rp); + /* And finally remove it. */ + raw3270_delete_device(rp); +} + +/* + * Set 3270 device offline. + */ +static int +raw3270_set_offline (struct ccw_device *cdev) +{ + struct raw3270 *rp; + + rp = dev_get_drvdata(&cdev->dev); + if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) + return -EBUSY; + raw3270_remove(cdev); + return 0; +} + +static int raw3270_pm_stop(struct ccw_device *cdev) +{ + struct raw3270 *rp; + struct raw3270_view *view; + unsigned long flags; + + rp = dev_get_drvdata(&cdev->dev); + if (!rp) + return 0; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + if (rp->view && rp->view->fn->deactivate) + rp->view->fn->deactivate(rp->view); + if (!test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) { + /* + * Release tty and fullscreen for all non-console + * devices. + */ + list_for_each_entry(view, &rp->view_list, list) { + if (view->fn->release) + view->fn->release(view); + } + } + set_bit(RAW3270_FLAGS_FROZEN, &rp->flags); + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + return 0; +} + +static int raw3270_pm_start(struct ccw_device *cdev) +{ + struct raw3270 *rp; + unsigned long flags; + + rp = dev_get_drvdata(&cdev->dev); + if (!rp) + return 0; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + clear_bit(RAW3270_FLAGS_FROZEN, &rp->flags); + if (rp->view && rp->view->fn->activate) + rp->view->fn->activate(rp->view); + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + return 0; +} + +void raw3270_pm_unfreeze(struct raw3270_view *view) +{ +#ifdef CONFIG_TN3270_CONSOLE + struct raw3270 *rp; + + rp = view->dev; + if (rp && test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) + ccw_device_force_console(rp->cdev); +#endif +} + +static struct ccw_device_id raw3270_id[] = { + { CCW_DEVICE(0x3270, 0) }, + { CCW_DEVICE(0x3271, 0) }, + { CCW_DEVICE(0x3272, 0) }, + { CCW_DEVICE(0x3273, 0) }, + { CCW_DEVICE(0x3274, 0) }, + { CCW_DEVICE(0x3275, 0) }, + { CCW_DEVICE(0x3276, 0) }, + { CCW_DEVICE(0x3277, 0) }, + { CCW_DEVICE(0x3278, 0) }, + { CCW_DEVICE(0x3279, 0) }, + { CCW_DEVICE(0x3174, 0) }, + { /* end of list */ }, +}; + +static struct ccw_driver raw3270_ccw_driver = { + .driver = { + .name = "3270", + .owner = THIS_MODULE, + }, + .ids = raw3270_id, + .probe = &raw3270_probe, + .remove = &raw3270_remove, + .set_online = &raw3270_set_online, + .set_offline = &raw3270_set_offline, + .freeze = &raw3270_pm_stop, + .thaw = &raw3270_pm_start, + .restore = &raw3270_pm_start, + .int_class = IRQIO_C70, +}; + +static int +raw3270_init(void) +{ + struct raw3270 *rp; + int rc; + + if (raw3270_registered) + return 0; + raw3270_registered = 1; + rc = ccw_driver_register(&raw3270_ccw_driver); + if (rc == 0) { + /* Create attributes for early (= console) device. */ + mutex_lock(&raw3270_mutex); + class3270 = class_create(THIS_MODULE, "3270"); + list_for_each_entry(rp, &raw3270_devices, list) { + get_device(&rp->cdev->dev); + raw3270_create_attributes(rp); + } + mutex_unlock(&raw3270_mutex); + } + return rc; +} + +static void +raw3270_exit(void) +{ + ccw_driver_unregister(&raw3270_ccw_driver); + class_destroy(class3270); +} + +MODULE_LICENSE("GPL"); + +module_init(raw3270_init); +module_exit(raw3270_exit); + +EXPORT_SYMBOL(class3270); +EXPORT_SYMBOL(raw3270_request_alloc); +EXPORT_SYMBOL(raw3270_request_free); +EXPORT_SYMBOL(raw3270_request_reset); +EXPORT_SYMBOL(raw3270_request_set_cmd); +EXPORT_SYMBOL(raw3270_request_add_data); +EXPORT_SYMBOL(raw3270_request_set_data); +EXPORT_SYMBOL(raw3270_request_set_idal); +EXPORT_SYMBOL(raw3270_buffer_address); +EXPORT_SYMBOL(raw3270_add_view); +EXPORT_SYMBOL(raw3270_del_view); +EXPORT_SYMBOL(raw3270_find_view); +EXPORT_SYMBOL(raw3270_activate_view); +EXPORT_SYMBOL(raw3270_deactivate_view); +EXPORT_SYMBOL(raw3270_start); +EXPORT_SYMBOL(raw3270_start_locked); +EXPORT_SYMBOL(raw3270_start_irq); +EXPORT_SYMBOL(raw3270_reset); +EXPORT_SYMBOL(raw3270_register_notifier); +EXPORT_SYMBOL(raw3270_unregister_notifier); +EXPORT_SYMBOL(raw3270_wait_queue); diff --git a/drivers/s390/char/raw3270.h b/drivers/s390/char/raw3270.h new file mode 100644 index 000000000..3afaa35f7 --- /dev/null +++ b/drivers/s390/char/raw3270.h @@ -0,0 +1,285 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * IBM/3270 Driver + * + * Author(s): + * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global) + * Rewritten for 2.5 by Martin Schwidefsky + * Copyright IBM Corp. 2003, 2009 + */ + +#include +#include + +/* ioctls for fullscreen 3270 */ +#define TUBICMD _IO('3', 3) /* set ccw command for fs reads. */ +#define TUBOCMD _IO('3', 4) /* set ccw command for fs writes. */ +#define TUBGETI _IO('3', 7) /* get ccw command for fs reads. */ +#define TUBGETO _IO('3', 8) /* get ccw command for fs writes. */ +#define TUBSETMOD _IO('3',12) /* FIXME: what does it do ?*/ +#define TUBGETMOD _IO('3',13) /* FIXME: what does it do ?*/ + +/* Local Channel Commands */ +#define TC_WRITE 0x01 /* Write */ +#define TC_RDBUF 0x02 /* Read Buffer */ +#define TC_EWRITE 0x05 /* Erase write */ +#define TC_READMOD 0x06 /* Read modified */ +#define TC_EWRITEA 0x0d /* Erase write alternate */ +#define TC_WRITESF 0x11 /* Write structured field */ + +/* Buffer Control Orders */ +#define TO_SF 0x1d /* Start field */ +#define TO_SBA 0x11 /* Set buffer address */ +#define TO_IC 0x13 /* Insert cursor */ +#define TO_PT 0x05 /* Program tab */ +#define TO_RA 0x3c /* Repeat to address */ +#define TO_SFE 0x29 /* Start field extended */ +#define TO_EUA 0x12 /* Erase unprotected to address */ +#define TO_MF 0x2c /* Modify field */ +#define TO_SA 0x28 /* Set attribute */ + +/* Field Attribute Bytes */ +#define TF_INPUT 0x40 /* Visible input */ +#define TF_INPUTN 0x4c /* Invisible input */ +#define TF_INMDT 0xc1 /* Visible, Set-MDT */ +#define TF_LOG 0x60 + +/* Character Attribute Bytes */ +#define TAT_RESET 0x00 +#define TAT_FIELD 0xc0 +#define TAT_EXTHI 0x41 +#define TAT_COLOR 0x42 +#define TAT_CHARS 0x43 +#define TAT_TRANS 0x46 + +/* Extended-Highlighting Bytes */ +#define TAX_RESET 0x00 +#define TAX_BLINK 0xf1 +#define TAX_REVER 0xf2 +#define TAX_UNDER 0xf4 + +/* Reset value */ +#define TAR_RESET 0x00 + +/* Color values */ +#define TAC_RESET 0x00 +#define TAC_BLUE 0xf1 +#define TAC_RED 0xf2 +#define TAC_PINK 0xf3 +#define TAC_GREEN 0xf4 +#define TAC_TURQ 0xf5 +#define TAC_YELLOW 0xf6 +#define TAC_WHITE 0xf7 +#define TAC_DEFAULT 0x00 + +/* Write Control Characters */ +#define TW_NONE 0x40 /* No particular action */ +#define TW_KR 0xc2 /* Keyboard restore */ +#define TW_PLUSALARM 0x04 /* Add this bit for alarm */ + +#define RAW3270_FIRSTMINOR 1 /* First minor number */ +#define RAW3270_MAXDEVS 255 /* Max number of 3270 devices */ + +/* For TUBGETMOD and TUBSETMOD. Should include. */ +struct raw3270_iocb { + short model; + short line_cnt; + short col_cnt; + short pf_cnt; + short re_cnt; + short map; +}; + +struct raw3270; +struct raw3270_view; +extern struct class *class3270; + +/* 3270 CCW request */ +struct raw3270_request { + struct list_head list; /* list head for request queueing. */ + struct raw3270_view *view; /* view of this request */ + struct ccw1 ccw; /* single ccw. */ + void *buffer; /* output buffer. */ + size_t size; /* size of output buffer. */ + int rescnt; /* residual count from devstat. */ + int rc; /* return code for this request. */ + + /* Callback for delivering final status. */ + void (*callback)(struct raw3270_request *, void *); + void *callback_data; +}; + +struct raw3270_request *raw3270_request_alloc(size_t size); +struct raw3270_request *raw3270_request_alloc_bootmem(size_t size); +void raw3270_request_free(struct raw3270_request *); +void raw3270_request_reset(struct raw3270_request *); +void raw3270_request_set_cmd(struct raw3270_request *, u8 cmd); +int raw3270_request_add_data(struct raw3270_request *, void *, size_t); +void raw3270_request_set_data(struct raw3270_request *, void *, size_t); +void raw3270_request_set_idal(struct raw3270_request *, struct idal_buffer *); + +static inline int +raw3270_request_final(struct raw3270_request *rq) +{ + return list_empty(&rq->list); +} + +void raw3270_buffer_address(struct raw3270 *, char *, unsigned short); + +/* + * Functions of a 3270 view. + */ +struct raw3270_fn { + int (*activate)(struct raw3270_view *); + void (*deactivate)(struct raw3270_view *); + void (*intv)(struct raw3270_view *, + struct raw3270_request *, struct irb *); + void (*release)(struct raw3270_view *); + void (*free)(struct raw3270_view *); + void (*resize)(struct raw3270_view *, int, int, int); +}; + +/* + * View structure chaining. The raw3270_view structure is meant to + * be embedded at the start of the real view data structure, e.g.: + * struct example { + * struct raw3270_view view; + * ... + * }; + */ +struct raw3270_view { + struct list_head list; + spinlock_t lock; +#define RAW3270_VIEW_LOCK_IRQ 0 +#define RAW3270_VIEW_LOCK_BH 1 + atomic_t ref_count; + struct raw3270 *dev; + struct raw3270_fn *fn; + unsigned int model; + unsigned int rows, cols; /* # of rows & colums of the view */ + unsigned char *ascebc; /* ascii -> ebcdic table */ +}; + +int raw3270_add_view(struct raw3270_view *, struct raw3270_fn *, int, int); +int raw3270_activate_view(struct raw3270_view *); +void raw3270_del_view(struct raw3270_view *); +void raw3270_deactivate_view(struct raw3270_view *); +struct raw3270_view *raw3270_find_view(struct raw3270_fn *, int); +int raw3270_start(struct raw3270_view *, struct raw3270_request *); +int raw3270_start_locked(struct raw3270_view *, struct raw3270_request *); +int raw3270_start_irq(struct raw3270_view *, struct raw3270_request *); +int raw3270_reset(struct raw3270_view *); +struct raw3270_view *raw3270_view(struct raw3270_view *); +int raw3270_view_active(struct raw3270_view *); + +/* Reference count inliner for view structures. */ +static inline void +raw3270_get_view(struct raw3270_view *view) +{ + atomic_inc(&view->ref_count); +} + +extern wait_queue_head_t raw3270_wait_queue; + +static inline void +raw3270_put_view(struct raw3270_view *view) +{ + if (atomic_dec_return(&view->ref_count) == 0) + wake_up(&raw3270_wait_queue); +} + +struct raw3270 *raw3270_setup_console(void); +void raw3270_wait_cons_dev(struct raw3270 *); + +/* Notifier for device addition/removal */ +struct raw3270_notifier { + struct list_head list; + void (*create)(int minor); + void (*destroy)(int minor); +}; + +int raw3270_register_notifier(struct raw3270_notifier *); +void raw3270_unregister_notifier(struct raw3270_notifier *); +void raw3270_pm_unfreeze(struct raw3270_view *); + +/* + * Little memory allocator for string objects. + */ +struct string +{ + struct list_head list; + struct list_head update; + unsigned long size; + unsigned long len; + char string[0]; +} __attribute__ ((aligned(8))); + +static inline struct string * +alloc_string(struct list_head *free_list, unsigned long len) +{ + struct string *cs, *tmp; + unsigned long size; + + size = (len + 7L) & -8L; + list_for_each_entry(cs, free_list, list) { + if (cs->size < size) + continue; + if (cs->size > size + sizeof(struct string)) { + char *endaddr = (char *) (cs + 1) + cs->size; + tmp = (struct string *) (endaddr - size) - 1; + tmp->size = size; + cs->size -= size + sizeof(struct string); + cs = tmp; + } else + list_del(&cs->list); + cs->len = len; + INIT_LIST_HEAD(&cs->list); + INIT_LIST_HEAD(&cs->update); + return cs; + } + return NULL; +} + +static inline unsigned long +free_string(struct list_head *free_list, struct string *cs) +{ + struct string *tmp; + struct list_head *p, *left; + + /* Find out the left neighbour in free memory list. */ + left = free_list; + list_for_each(p, free_list) { + if (list_entry(p, struct string, list) > cs) + break; + left = p; + } + /* Try to merge with right neighbour = next element from left. */ + if (left->next != free_list) { + tmp = list_entry(left->next, struct string, list); + if ((char *) (cs + 1) + cs->size == (char *) tmp) { + list_del(&tmp->list); + cs->size += tmp->size + sizeof(struct string); + } + } + /* Try to merge with left neighbour. */ + if (left != free_list) { + tmp = list_entry(left, struct string, list); + if ((char *) (tmp + 1) + tmp->size == (char *) cs) { + tmp->size += cs->size + sizeof(struct string); + return tmp->size; + } + } + __list_add(&cs->list, left, left->next); + return cs->size; +} + +static inline void +add_string_memory(struct list_head *free_list, void *mem, unsigned long size) +{ + struct string *cs; + + cs = (struct string *) mem; + cs->size = size - sizeof(struct string); + free_string(free_list, cs); +} + diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c new file mode 100644 index 000000000..e9aa71cdf --- /dev/null +++ b/drivers/s390/char/sclp.c @@ -0,0 +1,1259 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * core function to access sclp interface + * + * Copyright IBM Corp. 1999, 2009 + * + * Author(s): Martin Peschke + * Martin Schwidefsky + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" + +#define SCLP_HEADER "sclp: " + +/* Lock to protect internal data consistency. */ +static DEFINE_SPINLOCK(sclp_lock); + +/* Mask of events that we can send to the sclp interface. */ +static sccb_mask_t sclp_receive_mask; + +/* Mask of events that we can receive from the sclp interface. */ +static sccb_mask_t sclp_send_mask; + +/* List of registered event listeners and senders. */ +static struct list_head sclp_reg_list; + +/* List of queued requests. */ +static struct list_head sclp_req_queue; + +/* Data for read and and init requests. */ +static struct sclp_req sclp_read_req; +static struct sclp_req sclp_init_req; +static char sclp_read_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); +static char sclp_init_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); + +/* Suspend request */ +static DECLARE_COMPLETION(sclp_request_queue_flushed); + +/* Number of console pages to allocate, used by sclp_con.c and sclp_vt220.c */ +int sclp_console_pages = SCLP_CONSOLE_PAGES; +/* Flag to indicate if buffer pages are dropped on buffer full condition */ +int sclp_console_drop = 1; +/* Number of times the console dropped buffer pages */ +unsigned long sclp_console_full; + +static void sclp_suspend_req_cb(struct sclp_req *req, void *data) +{ + complete(&sclp_request_queue_flushed); +} + +static int __init sclp_setup_console_pages(char *str) +{ + int pages, rc; + + rc = kstrtoint(str, 0, &pages); + if (!rc && pages >= SCLP_CONSOLE_PAGES) + sclp_console_pages = pages; + return 1; +} + +__setup("sclp_con_pages=", sclp_setup_console_pages); + +static int __init sclp_setup_console_drop(char *str) +{ + int drop, rc; + + rc = kstrtoint(str, 0, &drop); + if (!rc) + sclp_console_drop = drop; + return 1; +} + +__setup("sclp_con_drop=", sclp_setup_console_drop); + +static struct sclp_req sclp_suspend_req; + +/* Timer for request retries. */ +static struct timer_list sclp_request_timer; + +/* Timer for queued requests. */ +static struct timer_list sclp_queue_timer; + +/* Internal state: is a request active at the sclp? */ +static volatile enum sclp_running_state_t { + sclp_running_state_idle, + sclp_running_state_running, + sclp_running_state_reset_pending +} sclp_running_state = sclp_running_state_idle; + +/* Internal state: is a read request pending? */ +static volatile enum sclp_reading_state_t { + sclp_reading_state_idle, + sclp_reading_state_reading +} sclp_reading_state = sclp_reading_state_idle; + +/* Internal state: is the driver currently serving requests? */ +static volatile enum sclp_activation_state_t { + sclp_activation_state_active, + sclp_activation_state_deactivating, + sclp_activation_state_inactive, + sclp_activation_state_activating +} sclp_activation_state = sclp_activation_state_active; + +/* Internal state: is an init mask request pending? */ +static volatile enum sclp_mask_state_t { + sclp_mask_state_idle, + sclp_mask_state_initializing +} sclp_mask_state = sclp_mask_state_idle; + +/* Internal state: is the driver suspended? */ +static enum sclp_suspend_state_t { + sclp_suspend_state_running, + sclp_suspend_state_suspended, +} sclp_suspend_state = sclp_suspend_state_running; + +/* Maximum retry counts */ +#define SCLP_INIT_RETRY 3 +#define SCLP_MASK_RETRY 3 + +/* Timeout intervals in seconds.*/ +#define SCLP_BUSY_INTERVAL 10 +#define SCLP_RETRY_INTERVAL 30 + +static void sclp_request_timeout(bool force_restart); +static void sclp_process_queue(void); +static void __sclp_make_read_req(void); +static int sclp_init_mask(int calculate); +static int sclp_init(void); + +static void +__sclp_queue_read_req(void) +{ + if (sclp_reading_state == sclp_reading_state_idle) { + sclp_reading_state = sclp_reading_state_reading; + __sclp_make_read_req(); + /* Add request to head of queue */ + list_add(&sclp_read_req.list, &sclp_req_queue); + } +} + +/* Set up request retry timer. Called while sclp_lock is locked. */ +static inline void +__sclp_set_request_timer(unsigned long time, void (*cb)(struct timer_list *)) +{ + del_timer(&sclp_request_timer); + sclp_request_timer.function = cb; + sclp_request_timer.expires = jiffies + time; + add_timer(&sclp_request_timer); +} + +static void sclp_request_timeout_restart(struct timer_list *unused) +{ + sclp_request_timeout(true); +} + +static void sclp_request_timeout_normal(struct timer_list *unused) +{ + sclp_request_timeout(false); +} + +/* Request timeout handler. Restart the request queue. If force_restart, + * force restart of running request. */ +static void sclp_request_timeout(bool force_restart) +{ + unsigned long flags; + + spin_lock_irqsave(&sclp_lock, flags); + if (force_restart) { + if (sclp_running_state == sclp_running_state_running) { + /* Break running state and queue NOP read event request + * to get a defined interface state. */ + __sclp_queue_read_req(); + sclp_running_state = sclp_running_state_idle; + } + } else { + __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, + sclp_request_timeout_normal); + } + spin_unlock_irqrestore(&sclp_lock, flags); + sclp_process_queue(); +} + +/* + * Returns the expire value in jiffies of the next pending request timeout, + * if any. Needs to be called with sclp_lock. + */ +static unsigned long __sclp_req_queue_find_next_timeout(void) +{ + unsigned long expires_next = 0; + struct sclp_req *req; + + list_for_each_entry(req, &sclp_req_queue, list) { + if (!req->queue_expires) + continue; + if (!expires_next || + (time_before(req->queue_expires, expires_next))) + expires_next = req->queue_expires; + } + return expires_next; +} + +/* + * Returns expired request, if any, and removes it from the list. + */ +static struct sclp_req *__sclp_req_queue_remove_expired_req(void) +{ + unsigned long flags, now; + struct sclp_req *req; + + spin_lock_irqsave(&sclp_lock, flags); + now = jiffies; + /* Don't need list_for_each_safe because we break out after list_del */ + list_for_each_entry(req, &sclp_req_queue, list) { + if (!req->queue_expires) + continue; + if (time_before_eq(req->queue_expires, now)) { + if (req->status == SCLP_REQ_QUEUED) { + req->status = SCLP_REQ_QUEUED_TIMEOUT; + list_del(&req->list); + goto out; + } + } + } + req = NULL; +out: + spin_unlock_irqrestore(&sclp_lock, flags); + return req; +} + +/* + * Timeout handler for queued requests. Removes request from list and + * invokes callback. This timer can be set per request in situations where + * waiting too long would be harmful to the system, e.g. during SE reboot. + */ +static void sclp_req_queue_timeout(struct timer_list *unused) +{ + unsigned long flags, expires_next; + struct sclp_req *req; + + do { + req = __sclp_req_queue_remove_expired_req(); + if (req && req->callback) + req->callback(req, req->callback_data); + } while (req); + + spin_lock_irqsave(&sclp_lock, flags); + expires_next = __sclp_req_queue_find_next_timeout(); + if (expires_next) + mod_timer(&sclp_queue_timer, expires_next); + spin_unlock_irqrestore(&sclp_lock, flags); +} + +/* Try to start a request. Return zero if the request was successfully + * started or if it will be started at a later time. Return non-zero otherwise. + * Called while sclp_lock is locked. */ +static int +__sclp_start_request(struct sclp_req *req) +{ + int rc; + + if (sclp_running_state != sclp_running_state_idle) + return 0; + del_timer(&sclp_request_timer); + rc = sclp_service_call(req->command, req->sccb); + req->start_count++; + + if (rc == 0) { + /* Successfully started request */ + req->status = SCLP_REQ_RUNNING; + sclp_running_state = sclp_running_state_running; + __sclp_set_request_timer(SCLP_RETRY_INTERVAL * HZ, + sclp_request_timeout_restart); + return 0; + } else if (rc == -EBUSY) { + /* Try again later */ + __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, + sclp_request_timeout_normal); + return 0; + } + /* Request failed */ + req->status = SCLP_REQ_FAILED; + return rc; +} + +/* Try to start queued requests. */ +static void +sclp_process_queue(void) +{ + struct sclp_req *req; + int rc; + unsigned long flags; + + spin_lock_irqsave(&sclp_lock, flags); + if (sclp_running_state != sclp_running_state_idle) { + spin_unlock_irqrestore(&sclp_lock, flags); + return; + } + del_timer(&sclp_request_timer); + while (!list_empty(&sclp_req_queue)) { + req = list_entry(sclp_req_queue.next, struct sclp_req, list); + if (!req->sccb) + goto do_post; + rc = __sclp_start_request(req); + if (rc == 0) + break; + /* Request failed */ + if (req->start_count > 1) { + /* Cannot abort already submitted request - could still + * be active at the SCLP */ + __sclp_set_request_timer(SCLP_BUSY_INTERVAL * HZ, + sclp_request_timeout_normal); + break; + } +do_post: + /* Post-processing for aborted request */ + list_del(&req->list); + if (req->callback) { + spin_unlock_irqrestore(&sclp_lock, flags); + req->callback(req, req->callback_data); + spin_lock_irqsave(&sclp_lock, flags); + } + } + spin_unlock_irqrestore(&sclp_lock, flags); +} + +static int __sclp_can_add_request(struct sclp_req *req) +{ + if (req == &sclp_suspend_req || req == &sclp_init_req) + return 1; + if (sclp_suspend_state != sclp_suspend_state_running) + return 0; + if (sclp_init_state != sclp_init_state_initialized) + return 0; + if (sclp_activation_state != sclp_activation_state_active) + return 0; + return 1; +} + +/* Queue a new request. Return zero on success, non-zero otherwise. */ +int +sclp_add_request(struct sclp_req *req) +{ + unsigned long flags; + int rc; + + spin_lock_irqsave(&sclp_lock, flags); + if (!__sclp_can_add_request(req)) { + spin_unlock_irqrestore(&sclp_lock, flags); + return -EIO; + } + req->status = SCLP_REQ_QUEUED; + req->start_count = 0; + list_add_tail(&req->list, &sclp_req_queue); + rc = 0; + if (req->queue_timeout) { + req->queue_expires = jiffies + req->queue_timeout * HZ; + if (!timer_pending(&sclp_queue_timer) || + time_after(sclp_queue_timer.expires, req->queue_expires)) + mod_timer(&sclp_queue_timer, req->queue_expires); + } else + req->queue_expires = 0; + /* Start if request is first in list */ + if (sclp_running_state == sclp_running_state_idle && + req->list.prev == &sclp_req_queue) { + if (!req->sccb) { + list_del(&req->list); + rc = -ENODATA; + goto out; + } + rc = __sclp_start_request(req); + if (rc) + list_del(&req->list); + } +out: + spin_unlock_irqrestore(&sclp_lock, flags); + return rc; +} + +EXPORT_SYMBOL(sclp_add_request); + +/* Dispatch events found in request buffer to registered listeners. Return 0 + * if all events were dispatched, non-zero otherwise. */ +static int +sclp_dispatch_evbufs(struct sccb_header *sccb) +{ + unsigned long flags; + struct evbuf_header *evbuf; + struct list_head *l; + struct sclp_register *reg; + int offset; + int rc; + + spin_lock_irqsave(&sclp_lock, flags); + rc = 0; + for (offset = sizeof(struct sccb_header); offset < sccb->length; + offset += evbuf->length) { + evbuf = (struct evbuf_header *) ((addr_t) sccb + offset); + /* Check for malformed hardware response */ + if (evbuf->length == 0) + break; + /* Search for event handler */ + reg = NULL; + list_for_each(l, &sclp_reg_list) { + reg = list_entry(l, struct sclp_register, list); + if (reg->receive_mask & SCLP_EVTYP_MASK(evbuf->type)) + break; + else + reg = NULL; + } + if (reg && reg->receiver_fn) { + spin_unlock_irqrestore(&sclp_lock, flags); + reg->receiver_fn(evbuf); + spin_lock_irqsave(&sclp_lock, flags); + } else if (reg == NULL) + rc = -EOPNOTSUPP; + } + spin_unlock_irqrestore(&sclp_lock, flags); + return rc; +} + +/* Read event data request callback. */ +static void +sclp_read_cb(struct sclp_req *req, void *data) +{ + unsigned long flags; + struct sccb_header *sccb; + + sccb = (struct sccb_header *) req->sccb; + if (req->status == SCLP_REQ_DONE && (sccb->response_code == 0x20 || + sccb->response_code == 0x220)) + sclp_dispatch_evbufs(sccb); + spin_lock_irqsave(&sclp_lock, flags); + sclp_reading_state = sclp_reading_state_idle; + spin_unlock_irqrestore(&sclp_lock, flags); +} + +/* Prepare read event data request. Called while sclp_lock is locked. */ +static void __sclp_make_read_req(void) +{ + struct sccb_header *sccb; + + sccb = (struct sccb_header *) sclp_read_sccb; + clear_page(sccb); + memset(&sclp_read_req, 0, sizeof(struct sclp_req)); + sclp_read_req.command = SCLP_CMDW_READ_EVENT_DATA; + sclp_read_req.status = SCLP_REQ_QUEUED; + sclp_read_req.start_count = 0; + sclp_read_req.callback = sclp_read_cb; + sclp_read_req.sccb = sccb; + sccb->length = PAGE_SIZE; + sccb->function_code = 0; + sccb->control_mask[2] = 0x80; +} + +/* Search request list for request with matching sccb. Return request if found, + * NULL otherwise. Called while sclp_lock is locked. */ +static inline struct sclp_req * +__sclp_find_req(u32 sccb) +{ + struct list_head *l; + struct sclp_req *req; + + list_for_each(l, &sclp_req_queue) { + req = list_entry(l, struct sclp_req, list); + if (sccb == (u32) (addr_t) req->sccb) + return req; + } + return NULL; +} + +/* Handler for external interruption. Perform request post-processing. + * Prepare read event data request if necessary. Start processing of next + * request on queue. */ +static void sclp_interrupt_handler(struct ext_code ext_code, + unsigned int param32, unsigned long param64) +{ + struct sclp_req *req; + u32 finished_sccb; + u32 evbuf_pending; + + inc_irq_stat(IRQEXT_SCP); + spin_lock(&sclp_lock); + finished_sccb = param32 & 0xfffffff8; + evbuf_pending = param32 & 0x3; + if (finished_sccb) { + del_timer(&sclp_request_timer); + sclp_running_state = sclp_running_state_reset_pending; + req = __sclp_find_req(finished_sccb); + if (req) { + /* Request post-processing */ + list_del(&req->list); + req->status = SCLP_REQ_DONE; + if (req->callback) { + spin_unlock(&sclp_lock); + req->callback(req, req->callback_data); + spin_lock(&sclp_lock); + } + } + sclp_running_state = sclp_running_state_idle; + } + if (evbuf_pending && + sclp_activation_state == sclp_activation_state_active) + __sclp_queue_read_req(); + spin_unlock(&sclp_lock); + sclp_process_queue(); +} + +/* Convert interval in jiffies to TOD ticks. */ +static inline u64 +sclp_tod_from_jiffies(unsigned long jiffies) +{ + return (u64) (jiffies / HZ) << 32; +} + +/* Wait until a currently running request finished. Note: while this function + * is running, no timers are served on the calling CPU. */ +void +sclp_sync_wait(void) +{ + unsigned long long old_tick; + unsigned long flags; + unsigned long cr0, cr0_sync; + u64 timeout; + int irq_context; + + /* We'll be disabling timer interrupts, so we need a custom timeout + * mechanism */ + timeout = 0; + if (timer_pending(&sclp_request_timer)) { + /* Get timeout TOD value */ + timeout = get_tod_clock_fast() + + sclp_tod_from_jiffies(sclp_request_timer.expires - + jiffies); + } + local_irq_save(flags); + /* Prevent bottom half from executing once we force interrupts open */ + irq_context = in_interrupt(); + if (!irq_context) + local_bh_disable(); + /* Enable service-signal interruption, disable timer interrupts */ + old_tick = local_tick_disable(); + trace_hardirqs_on(); + __ctl_store(cr0, 0, 0); + cr0_sync = cr0 & ~CR0_IRQ_SUBCLASS_MASK; + cr0_sync |= 1UL << (63 - 54); + __ctl_load(cr0_sync, 0, 0); + __arch_local_irq_stosm(0x01); + /* Loop until driver state indicates finished request */ + while (sclp_running_state != sclp_running_state_idle) { + /* Check for expired request timer */ + if (timer_pending(&sclp_request_timer) && + get_tod_clock_fast() > timeout && + del_timer(&sclp_request_timer)) + sclp_request_timer.function(&sclp_request_timer); + cpu_relax(); + } + local_irq_disable(); + __ctl_load(cr0, 0, 0); + if (!irq_context) + _local_bh_enable(); + local_tick_enable(old_tick); + local_irq_restore(flags); +} +EXPORT_SYMBOL(sclp_sync_wait); + +/* Dispatch changes in send and receive mask to registered listeners. */ +static void +sclp_dispatch_state_change(void) +{ + struct list_head *l; + struct sclp_register *reg; + unsigned long flags; + sccb_mask_t receive_mask; + sccb_mask_t send_mask; + + do { + spin_lock_irqsave(&sclp_lock, flags); + reg = NULL; + list_for_each(l, &sclp_reg_list) { + reg = list_entry(l, struct sclp_register, list); + receive_mask = reg->send_mask & sclp_receive_mask; + send_mask = reg->receive_mask & sclp_send_mask; + if (reg->sclp_receive_mask != receive_mask || + reg->sclp_send_mask != send_mask) { + reg->sclp_receive_mask = receive_mask; + reg->sclp_send_mask = send_mask; + break; + } else + reg = NULL; + } + spin_unlock_irqrestore(&sclp_lock, flags); + if (reg && reg->state_change_fn) + reg->state_change_fn(reg); + } while (reg); +} + +struct sclp_statechangebuf { + struct evbuf_header header; + u8 validity_sclp_active_facility_mask : 1; + u8 validity_sclp_receive_mask : 1; + u8 validity_sclp_send_mask : 1; + u8 validity_read_data_function_mask : 1; + u16 _zeros : 12; + u16 mask_length; + u64 sclp_active_facility_mask; + u8 masks[2 * 1021 + 4]; /* variable length */ + /* + * u8 sclp_receive_mask[mask_length]; + * u8 sclp_send_mask[mask_length]; + * u32 read_data_function_mask; + */ +} __attribute__((packed)); + + +/* State change event callback. Inform listeners of changes. */ +static void +sclp_state_change_cb(struct evbuf_header *evbuf) +{ + unsigned long flags; + struct sclp_statechangebuf *scbuf; + + BUILD_BUG_ON(sizeof(struct sclp_statechangebuf) > PAGE_SIZE); + + scbuf = (struct sclp_statechangebuf *) evbuf; + spin_lock_irqsave(&sclp_lock, flags); + if (scbuf->validity_sclp_receive_mask) + sclp_receive_mask = sccb_get_recv_mask(scbuf); + if (scbuf->validity_sclp_send_mask) + sclp_send_mask = sccb_get_send_mask(scbuf); + spin_unlock_irqrestore(&sclp_lock, flags); + if (scbuf->validity_sclp_active_facility_mask) + sclp.facilities = scbuf->sclp_active_facility_mask; + sclp_dispatch_state_change(); +} + +static struct sclp_register sclp_state_change_event = { + .receive_mask = EVTYP_STATECHANGE_MASK, + .receiver_fn = sclp_state_change_cb +}; + +/* Calculate receive and send mask of currently registered listeners. + * Called while sclp_lock is locked. */ +static inline void +__sclp_get_mask(sccb_mask_t *receive_mask, sccb_mask_t *send_mask) +{ + struct list_head *l; + struct sclp_register *t; + + *receive_mask = 0; + *send_mask = 0; + list_for_each(l, &sclp_reg_list) { + t = list_entry(l, struct sclp_register, list); + *receive_mask |= t->receive_mask; + *send_mask |= t->send_mask; + } +} + +/* Register event listener. Return 0 on success, non-zero otherwise. */ +int +sclp_register(struct sclp_register *reg) +{ + unsigned long flags; + sccb_mask_t receive_mask; + sccb_mask_t send_mask; + int rc; + + rc = sclp_init(); + if (rc) + return rc; + spin_lock_irqsave(&sclp_lock, flags); + /* Check event mask for collisions */ + __sclp_get_mask(&receive_mask, &send_mask); + if (reg->receive_mask & receive_mask || reg->send_mask & send_mask) { + spin_unlock_irqrestore(&sclp_lock, flags); + return -EBUSY; + } + /* Trigger initial state change callback */ + reg->sclp_receive_mask = 0; + reg->sclp_send_mask = 0; + reg->pm_event_posted = 0; + list_add(®->list, &sclp_reg_list); + spin_unlock_irqrestore(&sclp_lock, flags); + rc = sclp_init_mask(1); + if (rc) { + spin_lock_irqsave(&sclp_lock, flags); + list_del(®->list); + spin_unlock_irqrestore(&sclp_lock, flags); + } + return rc; +} + +EXPORT_SYMBOL(sclp_register); + +/* Unregister event listener. */ +void +sclp_unregister(struct sclp_register *reg) +{ + unsigned long flags; + + spin_lock_irqsave(&sclp_lock, flags); + list_del(®->list); + spin_unlock_irqrestore(&sclp_lock, flags); + sclp_init_mask(1); +} + +EXPORT_SYMBOL(sclp_unregister); + +/* Remove event buffers which are marked processed. Return the number of + * remaining event buffers. */ +int +sclp_remove_processed(struct sccb_header *sccb) +{ + struct evbuf_header *evbuf; + int unprocessed; + u16 remaining; + + evbuf = (struct evbuf_header *) (sccb + 1); + unprocessed = 0; + remaining = sccb->length - sizeof(struct sccb_header); + while (remaining > 0) { + remaining -= evbuf->length; + if (evbuf->flags & 0x80) { + sccb->length -= evbuf->length; + memcpy(evbuf, (void *) ((addr_t) evbuf + evbuf->length), + remaining); + } else { + unprocessed++; + evbuf = (struct evbuf_header *) + ((addr_t) evbuf + evbuf->length); + } + } + return unprocessed; +} + +EXPORT_SYMBOL(sclp_remove_processed); + +/* Prepare init mask request. Called while sclp_lock is locked. */ +static inline void +__sclp_make_init_req(sccb_mask_t receive_mask, sccb_mask_t send_mask) +{ + struct init_sccb *sccb; + + sccb = (struct init_sccb *) sclp_init_sccb; + clear_page(sccb); + memset(&sclp_init_req, 0, sizeof(struct sclp_req)); + sclp_init_req.command = SCLP_CMDW_WRITE_EVENT_MASK; + sclp_init_req.status = SCLP_REQ_FILLED; + sclp_init_req.start_count = 0; + sclp_init_req.callback = NULL; + sclp_init_req.callback_data = NULL; + sclp_init_req.sccb = sccb; + sccb->header.length = sizeof(*sccb); + if (sclp_mask_compat_mode) + sccb->mask_length = SCLP_MASK_SIZE_COMPAT; + else + sccb->mask_length = sizeof(sccb_mask_t); + sccb_set_recv_mask(sccb, receive_mask); + sccb_set_send_mask(sccb, send_mask); + sccb_set_sclp_recv_mask(sccb, 0); + sccb_set_sclp_send_mask(sccb, 0); +} + +/* Start init mask request. If calculate is non-zero, calculate the mask as + * requested by registered listeners. Use zero mask otherwise. Return 0 on + * success, non-zero otherwise. */ +static int +sclp_init_mask(int calculate) +{ + unsigned long flags; + struct init_sccb *sccb = (struct init_sccb *) sclp_init_sccb; + sccb_mask_t receive_mask; + sccb_mask_t send_mask; + int retry; + int rc; + unsigned long wait; + + spin_lock_irqsave(&sclp_lock, flags); + /* Check if interface is in appropriate state */ + if (sclp_mask_state != sclp_mask_state_idle) { + spin_unlock_irqrestore(&sclp_lock, flags); + return -EBUSY; + } + if (sclp_activation_state == sclp_activation_state_inactive) { + spin_unlock_irqrestore(&sclp_lock, flags); + return -EINVAL; + } + sclp_mask_state = sclp_mask_state_initializing; + /* Determine mask */ + if (calculate) + __sclp_get_mask(&receive_mask, &send_mask); + else { + receive_mask = 0; + send_mask = 0; + } + rc = -EIO; + for (retry = 0; retry <= SCLP_MASK_RETRY; retry++) { + /* Prepare request */ + __sclp_make_init_req(receive_mask, send_mask); + spin_unlock_irqrestore(&sclp_lock, flags); + if (sclp_add_request(&sclp_init_req)) { + /* Try again later */ + wait = jiffies + SCLP_BUSY_INTERVAL * HZ; + while (time_before(jiffies, wait)) + sclp_sync_wait(); + spin_lock_irqsave(&sclp_lock, flags); + continue; + } + while (sclp_init_req.status != SCLP_REQ_DONE && + sclp_init_req.status != SCLP_REQ_FAILED) + sclp_sync_wait(); + spin_lock_irqsave(&sclp_lock, flags); + if (sclp_init_req.status == SCLP_REQ_DONE && + sccb->header.response_code == 0x20) { + /* Successful request */ + if (calculate) { + sclp_receive_mask = sccb_get_sclp_recv_mask(sccb); + sclp_send_mask = sccb_get_sclp_send_mask(sccb); + } else { + sclp_receive_mask = 0; + sclp_send_mask = 0; + } + spin_unlock_irqrestore(&sclp_lock, flags); + sclp_dispatch_state_change(); + spin_lock_irqsave(&sclp_lock, flags); + rc = 0; + break; + } + } + sclp_mask_state = sclp_mask_state_idle; + spin_unlock_irqrestore(&sclp_lock, flags); + return rc; +} + +/* Deactivate SCLP interface. On success, new requests will be rejected, + * events will no longer be dispatched. Return 0 on success, non-zero + * otherwise. */ +int +sclp_deactivate(void) +{ + unsigned long flags; + int rc; + + spin_lock_irqsave(&sclp_lock, flags); + /* Deactivate can only be called when active */ + if (sclp_activation_state != sclp_activation_state_active) { + spin_unlock_irqrestore(&sclp_lock, flags); + return -EINVAL; + } + sclp_activation_state = sclp_activation_state_deactivating; + spin_unlock_irqrestore(&sclp_lock, flags); + rc = sclp_init_mask(0); + spin_lock_irqsave(&sclp_lock, flags); + if (rc == 0) + sclp_activation_state = sclp_activation_state_inactive; + else + sclp_activation_state = sclp_activation_state_active; + spin_unlock_irqrestore(&sclp_lock, flags); + return rc; +} + +EXPORT_SYMBOL(sclp_deactivate); + +/* Reactivate SCLP interface after sclp_deactivate. On success, new + * requests will be accepted, events will be dispatched again. Return 0 on + * success, non-zero otherwise. */ +int +sclp_reactivate(void) +{ + unsigned long flags; + int rc; + + spin_lock_irqsave(&sclp_lock, flags); + /* Reactivate can only be called when inactive */ + if (sclp_activation_state != sclp_activation_state_inactive) { + spin_unlock_irqrestore(&sclp_lock, flags); + return -EINVAL; + } + sclp_activation_state = sclp_activation_state_activating; + spin_unlock_irqrestore(&sclp_lock, flags); + rc = sclp_init_mask(1); + spin_lock_irqsave(&sclp_lock, flags); + if (rc == 0) + sclp_activation_state = sclp_activation_state_active; + else + sclp_activation_state = sclp_activation_state_inactive; + spin_unlock_irqrestore(&sclp_lock, flags); + return rc; +} + +EXPORT_SYMBOL(sclp_reactivate); + +/* Handler for external interruption used during initialization. Modify + * request state to done. */ +static void sclp_check_handler(struct ext_code ext_code, + unsigned int param32, unsigned long param64) +{ + u32 finished_sccb; + + inc_irq_stat(IRQEXT_SCP); + finished_sccb = param32 & 0xfffffff8; + /* Is this the interrupt we are waiting for? */ + if (finished_sccb == 0) + return; + if (finished_sccb != (u32) (addr_t) sclp_init_sccb) + panic("sclp: unsolicited interrupt for buffer at 0x%x\n", + finished_sccb); + spin_lock(&sclp_lock); + if (sclp_running_state == sclp_running_state_running) { + sclp_init_req.status = SCLP_REQ_DONE; + sclp_running_state = sclp_running_state_idle; + } + spin_unlock(&sclp_lock); +} + +/* Initial init mask request timed out. Modify request state to failed. */ +static void +sclp_check_timeout(struct timer_list *unused) +{ + unsigned long flags; + + spin_lock_irqsave(&sclp_lock, flags); + if (sclp_running_state == sclp_running_state_running) { + sclp_init_req.status = SCLP_REQ_FAILED; + sclp_running_state = sclp_running_state_idle; + } + spin_unlock_irqrestore(&sclp_lock, flags); +} + +/* Perform a check of the SCLP interface. Return zero if the interface is + * available and there are no pending requests from a previous instance. + * Return non-zero otherwise. */ +static int +sclp_check_interface(void) +{ + struct init_sccb *sccb; + unsigned long flags; + int retry; + int rc; + + spin_lock_irqsave(&sclp_lock, flags); + /* Prepare init mask command */ + rc = register_external_irq(EXT_IRQ_SERVICE_SIG, sclp_check_handler); + if (rc) { + spin_unlock_irqrestore(&sclp_lock, flags); + return rc; + } + for (retry = 0; retry <= SCLP_INIT_RETRY; retry++) { + __sclp_make_init_req(0, 0); + sccb = (struct init_sccb *) sclp_init_req.sccb; + rc = sclp_service_call(sclp_init_req.command, sccb); + if (rc == -EIO) + break; + sclp_init_req.status = SCLP_REQ_RUNNING; + sclp_running_state = sclp_running_state_running; + __sclp_set_request_timer(SCLP_RETRY_INTERVAL * HZ, + sclp_check_timeout); + spin_unlock_irqrestore(&sclp_lock, flags); + /* Enable service-signal interruption - needs to happen + * with IRQs enabled. */ + irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); + /* Wait for signal from interrupt or timeout */ + sclp_sync_wait(); + /* Disable service-signal interruption - needs to happen + * with IRQs enabled. */ + irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL); + spin_lock_irqsave(&sclp_lock, flags); + del_timer(&sclp_request_timer); + rc = -EBUSY; + if (sclp_init_req.status == SCLP_REQ_DONE) { + if (sccb->header.response_code == 0x20) { + rc = 0; + break; + } else if (sccb->header.response_code == 0x74f0) { + if (!sclp_mask_compat_mode) { + sclp_mask_compat_mode = true; + retry = 0; + } + } + } + } + unregister_external_irq(EXT_IRQ_SERVICE_SIG, sclp_check_handler); + spin_unlock_irqrestore(&sclp_lock, flags); + return rc; +} + +/* Reboot event handler. Reset send and receive mask to prevent pending SCLP + * events from interfering with rebooted system. */ +static int +sclp_reboot_event(struct notifier_block *this, unsigned long event, void *ptr) +{ + sclp_deactivate(); + return NOTIFY_DONE; +} + +static struct notifier_block sclp_reboot_notifier = { + .notifier_call = sclp_reboot_event +}; + +/* + * Suspend/resume SCLP notifier implementation + */ + +static void sclp_pm_event(enum sclp_pm_event sclp_pm_event, int rollback) +{ + struct sclp_register *reg; + unsigned long flags; + + if (!rollback) { + spin_lock_irqsave(&sclp_lock, flags); + list_for_each_entry(reg, &sclp_reg_list, list) + reg->pm_event_posted = 0; + spin_unlock_irqrestore(&sclp_lock, flags); + } + do { + spin_lock_irqsave(&sclp_lock, flags); + list_for_each_entry(reg, &sclp_reg_list, list) { + if (rollback && reg->pm_event_posted) + goto found; + if (!rollback && !reg->pm_event_posted) + goto found; + } + spin_unlock_irqrestore(&sclp_lock, flags); + return; +found: + spin_unlock_irqrestore(&sclp_lock, flags); + if (reg->pm_event_fn) + reg->pm_event_fn(reg, sclp_pm_event); + reg->pm_event_posted = rollback ? 0 : 1; + } while (1); +} + +/* + * Susend/resume callbacks for platform device + */ + +static int sclp_freeze(struct device *dev) +{ + unsigned long flags; + int rc; + + sclp_pm_event(SCLP_PM_EVENT_FREEZE, 0); + + spin_lock_irqsave(&sclp_lock, flags); + sclp_suspend_state = sclp_suspend_state_suspended; + spin_unlock_irqrestore(&sclp_lock, flags); + + /* Init supend data */ + memset(&sclp_suspend_req, 0, sizeof(sclp_suspend_req)); + sclp_suspend_req.callback = sclp_suspend_req_cb; + sclp_suspend_req.status = SCLP_REQ_FILLED; + init_completion(&sclp_request_queue_flushed); + + rc = sclp_add_request(&sclp_suspend_req); + if (rc == 0) + wait_for_completion(&sclp_request_queue_flushed); + else if (rc != -ENODATA) + goto fail_thaw; + + rc = sclp_deactivate(); + if (rc) + goto fail_thaw; + return 0; + +fail_thaw: + spin_lock_irqsave(&sclp_lock, flags); + sclp_suspend_state = sclp_suspend_state_running; + spin_unlock_irqrestore(&sclp_lock, flags); + sclp_pm_event(SCLP_PM_EVENT_THAW, 1); + return rc; +} + +static int sclp_undo_suspend(enum sclp_pm_event event) +{ + unsigned long flags; + int rc; + + rc = sclp_reactivate(); + if (rc) + return rc; + + spin_lock_irqsave(&sclp_lock, flags); + sclp_suspend_state = sclp_suspend_state_running; + spin_unlock_irqrestore(&sclp_lock, flags); + + sclp_pm_event(event, 0); + return 0; +} + +static int sclp_thaw(struct device *dev) +{ + return sclp_undo_suspend(SCLP_PM_EVENT_THAW); +} + +static int sclp_restore(struct device *dev) +{ + return sclp_undo_suspend(SCLP_PM_EVENT_RESTORE); +} + +static const struct dev_pm_ops sclp_pm_ops = { + .freeze = sclp_freeze, + .thaw = sclp_thaw, + .restore = sclp_restore, +}; + +static ssize_t con_pages_show(struct device_driver *dev, char *buf) +{ + return sprintf(buf, "%i\n", sclp_console_pages); +} + +static DRIVER_ATTR_RO(con_pages); + +static ssize_t con_drop_show(struct device_driver *dev, char *buf) +{ + return sprintf(buf, "%i\n", sclp_console_drop); +} + +static DRIVER_ATTR_RO(con_drop); + +static ssize_t con_full_show(struct device_driver *dev, char *buf) +{ + return sprintf(buf, "%lu\n", sclp_console_full); +} + +static DRIVER_ATTR_RO(con_full); + +static struct attribute *sclp_drv_attrs[] = { + &driver_attr_con_pages.attr, + &driver_attr_con_drop.attr, + &driver_attr_con_full.attr, + NULL, +}; +static struct attribute_group sclp_drv_attr_group = { + .attrs = sclp_drv_attrs, +}; +static const struct attribute_group *sclp_drv_attr_groups[] = { + &sclp_drv_attr_group, + NULL, +}; + +static struct platform_driver sclp_pdrv = { + .driver = { + .name = "sclp", + .pm = &sclp_pm_ops, + .groups = sclp_drv_attr_groups, + }, +}; + +static struct platform_device *sclp_pdev; + +/* Initialize SCLP driver. Return zero if driver is operational, non-zero + * otherwise. */ +static int +sclp_init(void) +{ + unsigned long flags; + int rc = 0; + + spin_lock_irqsave(&sclp_lock, flags); + /* Check for previous or running initialization */ + if (sclp_init_state != sclp_init_state_uninitialized) + goto fail_unlock; + sclp_init_state = sclp_init_state_initializing; + /* Set up variables */ + INIT_LIST_HEAD(&sclp_req_queue); + INIT_LIST_HEAD(&sclp_reg_list); + list_add(&sclp_state_change_event.list, &sclp_reg_list); + timer_setup(&sclp_request_timer, NULL, 0); + timer_setup(&sclp_queue_timer, sclp_req_queue_timeout, 0); + /* Check interface */ + spin_unlock_irqrestore(&sclp_lock, flags); + rc = sclp_check_interface(); + spin_lock_irqsave(&sclp_lock, flags); + if (rc) + goto fail_init_state_uninitialized; + /* Register reboot handler */ + rc = register_reboot_notifier(&sclp_reboot_notifier); + if (rc) + goto fail_init_state_uninitialized; + /* Register interrupt handler */ + rc = register_external_irq(EXT_IRQ_SERVICE_SIG, sclp_interrupt_handler); + if (rc) + goto fail_unregister_reboot_notifier; + sclp_init_state = sclp_init_state_initialized; + spin_unlock_irqrestore(&sclp_lock, flags); + /* Enable service-signal external interruption - needs to happen with + * IRQs enabled. */ + irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); + sclp_init_mask(1); + return 0; + +fail_unregister_reboot_notifier: + unregister_reboot_notifier(&sclp_reboot_notifier); +fail_init_state_uninitialized: + sclp_init_state = sclp_init_state_uninitialized; +fail_unlock: + spin_unlock_irqrestore(&sclp_lock, flags); + return rc; +} + +/* + * SCLP panic notifier: If we are suspended, we thaw SCLP in order to be able + * to print the panic message. + */ +static int sclp_panic_notify(struct notifier_block *self, + unsigned long event, void *data) +{ + if (sclp_suspend_state == sclp_suspend_state_suspended) + sclp_undo_suspend(SCLP_PM_EVENT_THAW); + return NOTIFY_OK; +} + +static struct notifier_block sclp_on_panic_nb = { + .notifier_call = sclp_panic_notify, + .priority = SCLP_PANIC_PRIO, +}; + +static __init int sclp_initcall(void) +{ + int rc; + + rc = platform_driver_register(&sclp_pdrv); + if (rc) + return rc; + + sclp_pdev = platform_device_register_simple("sclp", -1, NULL, 0); + rc = PTR_ERR_OR_ZERO(sclp_pdev); + if (rc) + goto fail_platform_driver_unregister; + + rc = atomic_notifier_chain_register(&panic_notifier_list, + &sclp_on_panic_nb); + if (rc) + goto fail_platform_device_unregister; + + return sclp_init(); + +fail_platform_device_unregister: + platform_device_unregister(sclp_pdev); +fail_platform_driver_unregister: + platform_driver_unregister(&sclp_pdrv); + return rc; +} + +arch_initcall(sclp_initcall); diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h new file mode 100644 index 000000000..1fe491808 --- /dev/null +++ b/drivers/s390/char/sclp.h @@ -0,0 +1,348 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 1999,2012 + * + * Author(s): Martin Peschke + * Martin Schwidefsky + */ + +#ifndef __SCLP_H__ +#define __SCLP_H__ + +#include +#include +#include +#include + +/* maximum number of pages concerning our own memory management */ +#define MAX_KMEM_PAGES (sizeof(unsigned long) << 3) +#define SCLP_CONSOLE_PAGES 6 + +#define SCLP_EVTYP_MASK(T) (1UL << (sizeof(sccb_mask_t) * BITS_PER_BYTE - (T))) + +#define EVTYP_OPCMD 0x01 +#define EVTYP_MSG 0x02 +#define EVTYP_CONFMGMDATA 0x04 +#define EVTYP_DIAG_TEST 0x07 +#define EVTYP_STATECHANGE 0x08 +#define EVTYP_PMSGCMD 0x09 +#define EVTYP_ASYNC 0x0A +#define EVTYP_CTLPROGIDENT 0x0B +#define EVTYP_STORE_DATA 0x0C +#define EVTYP_ERRNOTIFY 0x18 +#define EVTYP_VT220MSG 0x1A +#define EVTYP_SDIAS 0x1C +#define EVTYP_SIGQUIESCE 0x1D +#define EVTYP_OCF 0x1E + +#define EVTYP_OPCMD_MASK SCLP_EVTYP_MASK(EVTYP_OPCMD) +#define EVTYP_MSG_MASK SCLP_EVTYP_MASK(EVTYP_MSG) +#define EVTYP_CONFMGMDATA_MASK SCLP_EVTYP_MASK(EVTYP_CONFMGMDATA) +#define EVTYP_DIAG_TEST_MASK SCLP_EVTYP_MASK(EVTYP_DIAG_TEST) +#define EVTYP_STATECHANGE_MASK SCLP_EVTYP_MASK(EVTYP_STATECHANGE) +#define EVTYP_PMSGCMD_MASK SCLP_EVTYP_MASK(EVTYP_PMSGCMD) +#define EVTYP_ASYNC_MASK SCLP_EVTYP_MASK(EVTYP_ASYNC) +#define EVTYP_CTLPROGIDENT_MASK SCLP_EVTYP_MASK(EVTYP_CTLPROGIDENT) +#define EVTYP_STORE_DATA_MASK SCLP_EVTYP_MASK(EVTYP_STORE_DATA) +#define EVTYP_ERRNOTIFY_MASK SCLP_EVTYP_MASK(EVTYP_ERRNOTIFY) +#define EVTYP_VT220MSG_MASK SCLP_EVTYP_MASK(EVTYP_VT220MSG) +#define EVTYP_SDIAS_MASK SCLP_EVTYP_MASK(EVTYP_SDIAS) +#define EVTYP_SIGQUIESCE_MASK SCLP_EVTYP_MASK(EVTYP_SIGQUIESCE) +#define EVTYP_OCF_MASK SCLP_EVTYP_MASK(EVTYP_OCF) + +#define GNRLMSGFLGS_DOM 0x8000 +#define GNRLMSGFLGS_SNDALRM 0x4000 +#define GNRLMSGFLGS_HOLDMSG 0x2000 + +#define LNTPFLGS_CNTLTEXT 0x8000 +#define LNTPFLGS_LABELTEXT 0x4000 +#define LNTPFLGS_DATATEXT 0x2000 +#define LNTPFLGS_ENDTEXT 0x1000 +#define LNTPFLGS_PROMPTTEXT 0x0800 + +typedef unsigned int sclp_cmdw_t; + +#define SCLP_CMDW_READ_CPU_INFO 0x00010001 +#define SCLP_CMDW_READ_EVENT_DATA 0x00770005 +#define SCLP_CMDW_WRITE_EVENT_DATA 0x00760005 +#define SCLP_CMDW_WRITE_EVENT_MASK 0x00780005 + +#define GDS_ID_MDSMU 0x1310 +#define GDS_ID_MDSROUTEINFO 0x1311 +#define GDS_ID_AGUNWRKCORR 0x1549 +#define GDS_ID_SNACONDREPORT 0x1532 +#define GDS_ID_CPMSU 0x1212 +#define GDS_ID_ROUTTARGINSTR 0x154D +#define GDS_ID_OPREQ 0x8070 +#define GDS_ID_TEXTCMD 0x1320 + +#define GDS_KEY_SELFDEFTEXTMSG 0x31 + +enum sclp_pm_event { + SCLP_PM_EVENT_FREEZE, + SCLP_PM_EVENT_THAW, + SCLP_PM_EVENT_RESTORE, +}; + +#define SCLP_PANIC_PRIO 1 +#define SCLP_PANIC_PRIO_CLIENT 0 + +typedef u64 sccb_mask_t; + +struct sccb_header { + u16 length; + u8 function_code; + u8 control_mask[3]; + u16 response_code; +} __attribute__((packed)); + +struct init_sccb { + struct sccb_header header; + u16 _reserved; + u16 mask_length; + u8 masks[4 * 1021]; /* variable length */ + /* + * u8 receive_mask[mask_length]; + * u8 send_mask[mask_length]; + * u8 sclp_receive_mask[mask_length]; + * u8 sclp_send_mask[mask_length]; + */ +} __attribute__((packed)); + +#define SCLP_MASK_SIZE_COMPAT 4 + +static inline sccb_mask_t sccb_get_mask(u8 *masks, size_t len, int i) +{ + sccb_mask_t res = 0; + + memcpy(&res, masks + i * len, min(sizeof(res), len)); + return res; +} + +static inline void sccb_set_mask(u8 *masks, size_t len, int i, sccb_mask_t val) +{ + memset(masks + i * len, 0, len); + memcpy(masks + i * len, &val, min(sizeof(val), len)); +} + +#define sccb_get_generic_mask(sccb, i) \ +({ \ + __typeof__(sccb) __sccb = sccb; \ + \ + sccb_get_mask(__sccb->masks, __sccb->mask_length, i); \ +}) +#define sccb_get_recv_mask(sccb) sccb_get_generic_mask(sccb, 0) +#define sccb_get_send_mask(sccb) sccb_get_generic_mask(sccb, 1) +#define sccb_get_sclp_recv_mask(sccb) sccb_get_generic_mask(sccb, 2) +#define sccb_get_sclp_send_mask(sccb) sccb_get_generic_mask(sccb, 3) + +#define sccb_set_generic_mask(sccb, i, val) \ +({ \ + __typeof__(sccb) __sccb = sccb; \ + \ + sccb_set_mask(__sccb->masks, __sccb->mask_length, i, val); \ +}) +#define sccb_set_recv_mask(sccb, val) sccb_set_generic_mask(sccb, 0, val) +#define sccb_set_send_mask(sccb, val) sccb_set_generic_mask(sccb, 1, val) +#define sccb_set_sclp_recv_mask(sccb, val) sccb_set_generic_mask(sccb, 2, val) +#define sccb_set_sclp_send_mask(sccb, val) sccb_set_generic_mask(sccb, 3, val) + +struct read_cpu_info_sccb { + struct sccb_header header; + u16 nr_configured; + u16 offset_configured; + u16 nr_standby; + u16 offset_standby; + u8 reserved[4096 - 16]; +} __attribute__((packed, aligned(PAGE_SIZE))); + +static inline void sclp_fill_core_info(struct sclp_core_info *info, + struct read_cpu_info_sccb *sccb) +{ + char *page = (char *) sccb; + + memset(info, 0, sizeof(*info)); + info->configured = sccb->nr_configured; + info->standby = sccb->nr_standby; + info->combined = sccb->nr_configured + sccb->nr_standby; + memcpy(&info->core, page + sccb->offset_configured, + info->combined * sizeof(struct sclp_core_entry)); +} + +#define SCLP_HAS_CHP_INFO (sclp.facilities & 0x8000000000000000ULL) +#define SCLP_HAS_CHP_RECONFIG (sclp.facilities & 0x2000000000000000ULL) +#define SCLP_HAS_CPU_INFO (sclp.facilities & 0x0800000000000000ULL) +#define SCLP_HAS_CPU_RECONFIG (sclp.facilities & 0x0400000000000000ULL) +#define SCLP_HAS_PCI_RECONFIG (sclp.facilities & 0x0000000040000000ULL) + + +struct gds_subvector { + u8 length; + u8 key; +} __attribute__((packed)); + +struct gds_vector { + u16 length; + u16 gds_id; +} __attribute__((packed)); + +struct evbuf_header { + u16 length; + u8 type; + u8 flags; + u16 _reserved; +} __attribute__((packed)); + +struct sclp_req { + struct list_head list; /* list_head for request queueing. */ + sclp_cmdw_t command; /* sclp command to execute */ + void *sccb; /* pointer to the sccb to execute */ + char status; /* status of this request */ + int start_count; /* number of SVCs done for this req */ + /* Callback that is called after reaching final status. */ + void (*callback)(struct sclp_req *, void *data); + void *callback_data; + int queue_timeout; /* request queue timeout (sec), set by + caller of sclp_add_request(), if + needed */ + /* Internal fields */ + unsigned long queue_expires; /* request queue timeout (jiffies) */ +}; + +#define SCLP_REQ_FILLED 0x00 /* request is ready to be processed */ +#define SCLP_REQ_QUEUED 0x01 /* request is queued to be processed */ +#define SCLP_REQ_RUNNING 0x02 /* request is currently running */ +#define SCLP_REQ_DONE 0x03 /* request is completed successfully */ +#define SCLP_REQ_FAILED 0x05 /* request is finally failed */ +#define SCLP_REQ_QUEUED_TIMEOUT 0x06 /* request on queue timed out */ + +#define SCLP_QUEUE_INTERVAL 5 /* timeout interval for request queue */ + +/* function pointers that a high level driver has to use for registration */ +/* of some routines it wants to be called from the low level driver */ +struct sclp_register { + struct list_head list; + /* User wants to receive: */ + sccb_mask_t receive_mask; + /* User wants to send: */ + sccb_mask_t send_mask; + /* H/W can receive: */ + sccb_mask_t sclp_receive_mask; + /* H/W can send: */ + sccb_mask_t sclp_send_mask; + /* called if event type availability changes */ + void (*state_change_fn)(struct sclp_register *); + /* called for events in cp_receive_mask/sclp_receive_mask */ + void (*receiver_fn)(struct evbuf_header *); + /* called for power management events */ + void (*pm_event_fn)(struct sclp_register *, enum sclp_pm_event); + /* pm event posted flag */ + int pm_event_posted; +}; + +/* externals from sclp.c */ +int sclp_add_request(struct sclp_req *req); +void sclp_sync_wait(void); +int sclp_register(struct sclp_register *reg); +void sclp_unregister(struct sclp_register *reg); +int sclp_remove_processed(struct sccb_header *sccb); +int sclp_deactivate(void); +int sclp_reactivate(void); +int sclp_sync_request(sclp_cmdw_t command, void *sccb); +int sclp_sync_request_timeout(sclp_cmdw_t command, void *sccb, int timeout); + +int sclp_sdias_init(void); +void sclp_sdias_exit(void); + +enum { + sclp_init_state_uninitialized, + sclp_init_state_initializing, + sclp_init_state_initialized +}; + +extern int sclp_init_state; +extern int sclp_console_pages; +extern int sclp_console_drop; +extern unsigned long sclp_console_full; +extern bool sclp_mask_compat_mode; + +extern char sclp_early_sccb[PAGE_SIZE]; + +void sclp_early_wait_irq(void); +int sclp_early_cmd(sclp_cmdw_t cmd, void *sccb); +unsigned int sclp_early_con_check_linemode(struct init_sccb *sccb); +unsigned int sclp_early_con_check_vt220(struct init_sccb *sccb); +int sclp_early_set_event_mask(struct init_sccb *sccb, + sccb_mask_t receive_mask, + sccb_mask_t send_mask); + +/* useful inlines */ + +/* Perform service call. Return 0 on success, non-zero otherwise. */ +static inline int sclp_service_call(sclp_cmdw_t command, void *sccb) +{ + int cc = 4; /* Initialize for program check handling */ + + asm volatile( + "0: .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */ + "1: ipm %0\n" + " srl %0,28\n" + "2:\n" + EX_TABLE(0b, 2b) + EX_TABLE(1b, 2b) + : "+&d" (cc) : "d" (command), "a" ((unsigned long)sccb) + : "cc", "memory"); + if (cc == 4) + return -EINVAL; + if (cc == 3) + return -EIO; + if (cc == 2) + return -EBUSY; + return 0; +} + +/* VM uses EBCDIC 037, LPAR+native(SE+HMC) use EBCDIC 500 */ +/* translate single character from ASCII to EBCDIC */ +static inline unsigned char +sclp_ascebc(unsigned char ch) +{ + return (MACHINE_IS_VM) ? _ascebc[ch] : _ascebc_500[ch]; +} + +/* translate string from EBCDIC to ASCII */ +static inline void +sclp_ebcasc_str(unsigned char *str, int nr) +{ + (MACHINE_IS_VM) ? EBCASC(str, nr) : EBCASC_500(str, nr); +} + +/* translate string from ASCII to EBCDIC */ +static inline void +sclp_ascebc_str(unsigned char *str, int nr) +{ + (MACHINE_IS_VM) ? ASCEBC(str, nr) : ASCEBC_500(str, nr); +} + +static inline struct gds_vector * +sclp_find_gds_vector(void *start, void *end, u16 id) +{ + struct gds_vector *v; + + for (v = start; (void *) v < end; v = (void *) v + v->length) + if (v->gds_id == id) + return v; + return NULL; +} + +static inline struct gds_subvector * +sclp_find_gds_subvector(void *start, void *end, u8 key) +{ + struct gds_subvector *sv; + + for (sv = start; (void *) sv < end; sv = (void *) sv + sv->length) + if (sv->key == key) + return sv; + return NULL; +} + +#endif /* __SCLP_H__ */ diff --git a/drivers/s390/char/sclp_async.c b/drivers/s390/char/sclp_async.c new file mode 100644 index 000000000..e69b12a40 --- /dev/null +++ b/drivers/s390/char/sclp_async.c @@ -0,0 +1,189 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Enable Asynchronous Notification via SCLP. + * + * Copyright IBM Corp. 2009 + * Author(s): Hans-Joachim Picht + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "sclp.h" + +static int callhome_enabled; +static struct sclp_req *request; +static struct sclp_async_sccb *sccb; +static int sclp_async_send_wait(char *message); +static struct ctl_table_header *callhome_sysctl_header; +static DEFINE_SPINLOCK(sclp_async_lock); +#define SCLP_NORMAL_WRITE 0x00 + +struct async_evbuf { + struct evbuf_header header; + u64 reserved; + u8 rflags; + u8 empty; + u8 rtype; + u8 otype; + char comp_id[12]; + char data[3000]; /* there is still some space left */ +} __attribute__((packed)); + +struct sclp_async_sccb { + struct sccb_header header; + struct async_evbuf evbuf; +} __attribute__((packed)); + +static struct sclp_register sclp_async_register = { + .send_mask = EVTYP_ASYNC_MASK, +}; + +static int call_home_on_panic(struct notifier_block *self, + unsigned long event, void *data) +{ + strncat(data, init_utsname()->nodename, + sizeof(init_utsname()->nodename)); + sclp_async_send_wait(data); + return NOTIFY_DONE; +} + +static struct notifier_block call_home_panic_nb = { + .notifier_call = call_home_on_panic, + .priority = INT_MAX, +}; + +static int zero; +static int one = 1; + +static struct ctl_table callhome_table[] = { + { + .procname = "callhome", + .data = &callhome_enabled, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &one, + }, + {} +}; + +static struct ctl_table kern_dir_table[] = { + { + .procname = "kernel", + .maxlen = 0, + .mode = 0555, + .child = callhome_table, + }, + {} +}; + +/* + * Function used to transfer asynchronous notification + * records which waits for send completion + */ +static int sclp_async_send_wait(char *message) +{ + struct async_evbuf *evb; + int rc; + unsigned long flags; + + if (!callhome_enabled) + return 0; + sccb->evbuf.header.type = EVTYP_ASYNC; + sccb->evbuf.rtype = 0xA5; + sccb->evbuf.otype = 0x00; + evb = &sccb->evbuf; + request->command = SCLP_CMDW_WRITE_EVENT_DATA; + request->sccb = sccb; + request->status = SCLP_REQ_FILLED; + strncpy(sccb->evbuf.data, message, sizeof(sccb->evbuf.data)); + /* + * Retain Queue + * e.g. 5639CC140 500 Red Hat RHEL5 Linux for zSeries (RHEL AS) + */ + strncpy(sccb->evbuf.comp_id, CONFIG_SCLP_ASYNC_ID, + sizeof(sccb->evbuf.comp_id)); + sccb->evbuf.header.length = sizeof(sccb->evbuf); + sccb->header.length = sizeof(sccb->evbuf) + sizeof(sccb->header); + sccb->header.function_code = SCLP_NORMAL_WRITE; + rc = sclp_add_request(request); + if (rc) + return rc; + spin_lock_irqsave(&sclp_async_lock, flags); + while (request->status != SCLP_REQ_DONE && + request->status != SCLP_REQ_FAILED) { + sclp_sync_wait(); + } + spin_unlock_irqrestore(&sclp_async_lock, flags); + if (request->status != SCLP_REQ_DONE) + return -EIO; + rc = ((struct sclp_async_sccb *) + request->sccb)->header.response_code; + if (rc != 0x0020) + return -EIO; + if (evb->header.flags != 0x80) + return -EIO; + return rc; +} + +static int __init sclp_async_init(void) +{ + int rc; + + rc = sclp_register(&sclp_async_register); + if (rc) + return rc; + rc = -EOPNOTSUPP; + if (!(sclp_async_register.sclp_receive_mask & EVTYP_ASYNC_MASK)) + goto out_sclp; + rc = -ENOMEM; + callhome_sysctl_header = register_sysctl_table(kern_dir_table); + if (!callhome_sysctl_header) + goto out_sclp; + request = kzalloc(sizeof(struct sclp_req), GFP_KERNEL); + sccb = (struct sclp_async_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!request || !sccb) + goto out_mem; + rc = atomic_notifier_chain_register(&panic_notifier_list, + &call_home_panic_nb); + if (!rc) + goto out; +out_mem: + kfree(request); + free_page((unsigned long) sccb); + unregister_sysctl_table(callhome_sysctl_header); +out_sclp: + sclp_unregister(&sclp_async_register); +out: + return rc; +} +module_init(sclp_async_init); + +static void __exit sclp_async_exit(void) +{ + atomic_notifier_chain_unregister(&panic_notifier_list, + &call_home_panic_nb); + unregister_sysctl_table(callhome_sysctl_header); + sclp_unregister(&sclp_async_register); + free_page((unsigned long) sccb); + kfree(request); +} +module_exit(sclp_async_exit); + +MODULE_AUTHOR("Copyright IBM Corp. 2009"); +MODULE_AUTHOR("Hans-Joachim Picht "); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("SCLP Asynchronous Notification Records"); diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c new file mode 100644 index 000000000..d7686a68c --- /dev/null +++ b/drivers/s390/char/sclp_cmd.c @@ -0,0 +1,673 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2007,2012 + * + * Author(s): Heiko Carstens , + * Peter Oberparleiter + */ + +#define KMSG_COMPONENT "sclp_cmd" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" + +static void sclp_sync_callback(struct sclp_req *req, void *data) +{ + struct completion *completion = data; + + complete(completion); +} + +int sclp_sync_request(sclp_cmdw_t cmd, void *sccb) +{ + return sclp_sync_request_timeout(cmd, sccb, 0); +} + +int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout) +{ + struct completion completion; + struct sclp_req *request; + int rc; + + request = kzalloc(sizeof(*request), GFP_KERNEL); + if (!request) + return -ENOMEM; + if (timeout) + request->queue_timeout = timeout; + request->command = cmd; + request->sccb = sccb; + request->status = SCLP_REQ_FILLED; + request->callback = sclp_sync_callback; + request->callback_data = &completion; + init_completion(&completion); + + /* Perform sclp request. */ + rc = sclp_add_request(request); + if (rc) + goto out; + wait_for_completion(&completion); + + /* Check response. */ + if (request->status != SCLP_REQ_DONE) { + pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n", + cmd, request->status); + rc = -EIO; + } +out: + kfree(request); + return rc; +} + +/* + * CPU configuration related functions. + */ + +#define SCLP_CMDW_CONFIGURE_CPU 0x00110001 +#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001 + +int _sclp_get_core_info(struct sclp_core_info *info) +{ + int rc; + struct read_cpu_info_sccb *sccb; + + if (!SCLP_HAS_CPU_INFO) + return -EOPNOTSUPP; + sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + sccb->header.length = sizeof(*sccb); + rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb, + SCLP_QUEUE_INTERVAL); + if (rc) + goto out; + if (sccb->header.response_code != 0x0010) { + pr_warn("readcpuinfo failed (response=0x%04x)\n", + sccb->header.response_code); + rc = -EIO; + goto out; + } + sclp_fill_core_info(info, sccb); +out: + free_page((unsigned long) sccb); + return rc; +} + +struct cpu_configure_sccb { + struct sccb_header header; +} __attribute__((packed, aligned(8))); + +static int do_core_configure(sclp_cmdw_t cmd) +{ + struct cpu_configure_sccb *sccb; + int rc; + + if (!SCLP_HAS_CPU_RECONFIG) + return -EOPNOTSUPP; + /* + * This is not going to cross a page boundary since we force + * kmalloc to have a minimum alignment of 8 bytes on s390. + */ + sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + sccb->header.length = sizeof(*sccb); + rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL); + if (rc) + goto out; + switch (sccb->header.response_code) { + case 0x0020: + case 0x0120: + break; + default: + pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n", + cmd, sccb->header.response_code); + rc = -EIO; + break; + } +out: + kfree(sccb); + return rc; +} + +int sclp_core_configure(u8 core) +{ + return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8); +} + +int sclp_core_deconfigure(u8 core) +{ + return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8); +} + +#ifdef CONFIG_MEMORY_HOTPLUG + +static DEFINE_MUTEX(sclp_mem_mutex); +static LIST_HEAD(sclp_mem_list); +static u8 sclp_max_storage_id; +static DECLARE_BITMAP(sclp_storage_ids, 256); +static int sclp_mem_state_changed; + +struct memory_increment { + struct list_head list; + u16 rn; + int standby; +}; + +struct assign_storage_sccb { + struct sccb_header header; + u16 rn; +} __packed; + +int arch_get_memory_phys_device(unsigned long start_pfn) +{ + if (!sclp.rzm) + return 0; + return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm); +} + +static unsigned long long rn2addr(u16 rn) +{ + return (unsigned long long) (rn - 1) * sclp.rzm; +} + +static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) +{ + struct assign_storage_sccb *sccb; + int rc; + + sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + sccb->header.length = PAGE_SIZE; + sccb->rn = rn; + rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL); + if (rc) + goto out; + switch (sccb->header.response_code) { + case 0x0020: + case 0x0120: + break; + default: + pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n", + cmd, sccb->header.response_code, rn); + rc = -EIO; + break; + } +out: + free_page((unsigned long) sccb); + return rc; +} + +static int sclp_assign_storage(u16 rn) +{ + unsigned long long start; + int rc; + + rc = do_assign_storage(0x000d0001, rn); + if (rc) + return rc; + start = rn2addr(rn); + storage_key_init_range(start, start + sclp.rzm); + return 0; +} + +static int sclp_unassign_storage(u16 rn) +{ + return do_assign_storage(0x000c0001, rn); +} + +struct attach_storage_sccb { + struct sccb_header header; + u16 :16; + u16 assigned; + u32 :32; + u32 entries[0]; +} __packed; + +static int sclp_attach_storage(u8 id) +{ + struct attach_storage_sccb *sccb; + int rc; + int i; + + sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + sccb->header.length = PAGE_SIZE; + sccb->header.function_code = 0x40; + rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb, + SCLP_QUEUE_INTERVAL); + if (rc) + goto out; + switch (sccb->header.response_code) { + case 0x0020: + set_bit(id, sclp_storage_ids); + for (i = 0; i < sccb->assigned; i++) { + if (sccb->entries[i]) + sclp_unassign_storage(sccb->entries[i] >> 16); + } + break; + default: + rc = -EIO; + break; + } +out: + free_page((unsigned long) sccb); + return rc; +} + +static int sclp_mem_change_state(unsigned long start, unsigned long size, + int online) +{ + struct memory_increment *incr; + unsigned long long istart; + int rc = 0; + + list_for_each_entry(incr, &sclp_mem_list, list) { + istart = rn2addr(incr->rn); + if (start + size - 1 < istart) + break; + if (start > istart + sclp.rzm - 1) + continue; + if (online) + rc |= sclp_assign_storage(incr->rn); + else + sclp_unassign_storage(incr->rn); + if (rc == 0) + incr->standby = online ? 0 : 1; + } + return rc ? -EIO : 0; +} + +static bool contains_standby_increment(unsigned long start, unsigned long end) +{ + struct memory_increment *incr; + unsigned long istart; + + list_for_each_entry(incr, &sclp_mem_list, list) { + istart = rn2addr(incr->rn); + if (end - 1 < istart) + continue; + if (start > istart + sclp.rzm - 1) + continue; + if (incr->standby) + return true; + } + return false; +} + +static int sclp_mem_notifier(struct notifier_block *nb, + unsigned long action, void *data) +{ + unsigned long start, size; + struct memory_notify *arg; + unsigned char id; + int rc = 0; + + arg = data; + start = arg->start_pfn << PAGE_SHIFT; + size = arg->nr_pages << PAGE_SHIFT; + mutex_lock(&sclp_mem_mutex); + for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1) + sclp_attach_storage(id); + switch (action) { + case MEM_GOING_OFFLINE: + /* + * We do not allow to set memory blocks offline that contain + * standby memory. This is done to simplify the "memory online" + * case. + */ + if (contains_standby_increment(start, start + size)) + rc = -EPERM; + break; + case MEM_ONLINE: + case MEM_CANCEL_OFFLINE: + break; + case MEM_GOING_ONLINE: + rc = sclp_mem_change_state(start, size, 1); + break; + case MEM_CANCEL_ONLINE: + sclp_mem_change_state(start, size, 0); + break; + case MEM_OFFLINE: + sclp_mem_change_state(start, size, 0); + break; + default: + rc = -EINVAL; + break; + } + if (!rc) + sclp_mem_state_changed = 1; + mutex_unlock(&sclp_mem_mutex); + return rc ? NOTIFY_BAD : NOTIFY_OK; +} + +static struct notifier_block sclp_mem_nb = { + .notifier_call = sclp_mem_notifier, +}; + +static void __init align_to_block_size(unsigned long long *start, + unsigned long long *size, + unsigned long long alignment) +{ + unsigned long long start_align, size_align; + + start_align = roundup(*start, alignment); + size_align = rounddown(*start + *size, alignment) - start_align; + + pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n", + *start, size_align >> 20, *size >> 20); + *start = start_align; + *size = size_align; +} + +static void __init add_memory_merged(u16 rn) +{ + unsigned long long start, size, addr, block_size; + static u16 first_rn, num; + + if (rn && first_rn && (first_rn + num == rn)) { + num++; + return; + } + if (!first_rn) + goto skip_add; + start = rn2addr(first_rn); + size = (unsigned long long) num * sclp.rzm; + if (start >= VMEM_MAX_PHYS) + goto skip_add; + if (start + size > VMEM_MAX_PHYS) + size = VMEM_MAX_PHYS - start; + if (memory_end_set && (start >= memory_end)) + goto skip_add; + if (memory_end_set && (start + size > memory_end)) + size = memory_end - start; + block_size = memory_block_size_bytes(); + align_to_block_size(&start, &size, block_size); + if (!size) + goto skip_add; + for (addr = start; addr < start + size; addr += block_size) + add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size); +skip_add: + first_rn = rn; + num = 1; +} + +static void __init sclp_add_standby_memory(void) +{ + struct memory_increment *incr; + + list_for_each_entry(incr, &sclp_mem_list, list) + if (incr->standby) + add_memory_merged(incr->rn); + add_memory_merged(0); +} + +static void __init insert_increment(u16 rn, int standby, int assigned) +{ + struct memory_increment *incr, *new_incr; + struct list_head *prev; + u16 last_rn; + + new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); + if (!new_incr) + return; + new_incr->rn = rn; + new_incr->standby = standby; + last_rn = 0; + prev = &sclp_mem_list; + list_for_each_entry(incr, &sclp_mem_list, list) { + if (assigned && incr->rn > rn) + break; + if (!assigned && incr->rn - last_rn > 1) + break; + last_rn = incr->rn; + prev = &incr->list; + } + if (!assigned) + new_incr->rn = last_rn + 1; + if (new_incr->rn > sclp.rnmax) { + kfree(new_incr); + return; + } + list_add(&new_incr->list, prev); +} + +static int sclp_mem_freeze(struct device *dev) +{ + if (!sclp_mem_state_changed) + return 0; + pr_err("Memory hotplug state changed, suspend refused.\n"); + return -EPERM; +} + +struct read_storage_sccb { + struct sccb_header header; + u16 max_id; + u16 assigned; + u16 standby; + u16 :16; + u32 entries[0]; +} __packed; + +static const struct dev_pm_ops sclp_mem_pm_ops = { + .freeze = sclp_mem_freeze, +}; + +static struct platform_driver sclp_mem_pdrv = { + .driver = { + .name = "sclp_mem", + .pm = &sclp_mem_pm_ops, + }, +}; + +static int __init sclp_detect_standby_memory(void) +{ + struct platform_device *sclp_pdev; + struct read_storage_sccb *sccb; + int i, id, assigned, rc; + + if (OLDMEM_BASE) /* No standby memory in kdump mode */ + return 0; + if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL) + return 0; + rc = -ENOMEM; + sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + goto out; + assigned = 0; + for (id = 0; id <= sclp_max_storage_id; id++) { + memset(sccb, 0, PAGE_SIZE); + sccb->header.length = PAGE_SIZE; + rc = sclp_sync_request(0x00040001 | id << 8, sccb); + if (rc) + goto out; + switch (sccb->header.response_code) { + case 0x0010: + set_bit(id, sclp_storage_ids); + for (i = 0; i < sccb->assigned; i++) { + if (!sccb->entries[i]) + continue; + assigned++; + insert_increment(sccb->entries[i] >> 16, 0, 1); + } + break; + case 0x0310: + break; + case 0x0410: + for (i = 0; i < sccb->assigned; i++) { + if (!sccb->entries[i]) + continue; + assigned++; + insert_increment(sccb->entries[i] >> 16, 1, 1); + } + break; + default: + rc = -EIO; + break; + } + if (!rc) + sclp_max_storage_id = sccb->max_id; + } + if (rc || list_empty(&sclp_mem_list)) + goto out; + for (i = 1; i <= sclp.rnmax - assigned; i++) + insert_increment(0, 1, 0); + rc = register_memory_notifier(&sclp_mem_nb); + if (rc) + goto out; + rc = platform_driver_register(&sclp_mem_pdrv); + if (rc) + goto out; + sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0); + rc = PTR_ERR_OR_ZERO(sclp_pdev); + if (rc) + goto out_driver; + sclp_add_standby_memory(); + goto out; +out_driver: + platform_driver_unregister(&sclp_mem_pdrv); +out: + free_page((unsigned long) sccb); + return rc; +} +__initcall(sclp_detect_standby_memory); + +#endif /* CONFIG_MEMORY_HOTPLUG */ + +/* + * Channel path configuration related functions. + */ + +#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 +#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 +#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 + +struct chp_cfg_sccb { + struct sccb_header header; + u8 ccm; + u8 reserved[6]; + u8 cssid; +} __attribute__((packed)); + +static int do_chp_configure(sclp_cmdw_t cmd) +{ + struct chp_cfg_sccb *sccb; + int rc; + + if (!SCLP_HAS_CHP_RECONFIG) + return -EOPNOTSUPP; + /* Prepare sccb. */ + sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + sccb->header.length = sizeof(*sccb); + rc = sclp_sync_request(cmd, sccb); + if (rc) + goto out; + switch (sccb->header.response_code) { + case 0x0020: + case 0x0120: + case 0x0440: + case 0x0450: + break; + default: + pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n", + cmd, sccb->header.response_code); + rc = -EIO; + break; + } +out: + free_page((unsigned long) sccb); + return rc; +} + +/** + * sclp_chp_configure - perform configure channel-path sclp command + * @chpid: channel-path ID + * + * Perform configure channel-path command sclp command for specified chpid. + * Return 0 after command successfully finished, non-zero otherwise. + */ +int sclp_chp_configure(struct chp_id chpid) +{ + return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); +} + +/** + * sclp_chp_deconfigure - perform deconfigure channel-path sclp command + * @chpid: channel-path ID + * + * Perform deconfigure channel-path command sclp command for specified chpid + * and wait for completion. On success return 0. Return non-zero otherwise. + */ +int sclp_chp_deconfigure(struct chp_id chpid) +{ + return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); +} + +struct chp_info_sccb { + struct sccb_header header; + u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; + u8 standby[SCLP_CHP_INFO_MASK_SIZE]; + u8 configured[SCLP_CHP_INFO_MASK_SIZE]; + u8 ccm; + u8 reserved[6]; + u8 cssid; +} __attribute__((packed)); + +/** + * sclp_chp_read_info - perform read channel-path information sclp command + * @info: resulting channel-path information data + * + * Perform read channel-path information sclp command and wait for completion. + * On success, store channel-path information in @info and return 0. Return + * non-zero otherwise. + */ +int sclp_chp_read_info(struct sclp_chp_info *info) +{ + struct chp_info_sccb *sccb; + int rc; + + if (!SCLP_HAS_CHP_INFO) + return -EOPNOTSUPP; + /* Prepare sccb. */ + sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + sccb->header.length = sizeof(*sccb); + rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); + if (rc) + goto out; + if (sccb->header.response_code != 0x0010) { + pr_warn("read channel-path info failed (response=0x%04x)\n", + sccb->header.response_code); + rc = -EIO; + goto out; + } + memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); + memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); + memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); +out: + free_page((unsigned long) sccb); + return rc; +} diff --git a/drivers/s390/char/sclp_con.c b/drivers/s390/char/sclp_con.c new file mode 100644 index 000000000..8966a1c1b --- /dev/null +++ b/drivers/s390/char/sclp_con.c @@ -0,0 +1,354 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCLP line mode console driver + * + * Copyright IBM Corp. 1999, 2009 + * Author(s): Martin Peschke + * Martin Schwidefsky + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" +#include "sclp_rw.h" +#include "sclp_tty.h" + +#define sclp_console_major 4 /* TTYAUX_MAJOR */ +#define sclp_console_minor 64 +#define sclp_console_name "ttyS" + +/* Lock to guard over changes to global variables */ +static spinlock_t sclp_con_lock; +/* List of free pages that can be used for console output buffering */ +static struct list_head sclp_con_pages; +/* List of full struct sclp_buffer structures ready for output */ +static struct list_head sclp_con_outqueue; +/* Pointer to current console buffer */ +static struct sclp_buffer *sclp_conbuf; +/* Timer for delayed output of console messages */ +static struct timer_list sclp_con_timer; +/* Suspend mode flag */ +static int sclp_con_suspended; +/* Flag that output queue is currently running */ +static int sclp_con_queue_running; + +/* Output format for console messages */ +static unsigned short sclp_con_columns; +static unsigned short sclp_con_width_htab; + +static void +sclp_conbuf_callback(struct sclp_buffer *buffer, int rc) +{ + unsigned long flags; + void *page; + + do { + page = sclp_unmake_buffer(buffer); + spin_lock_irqsave(&sclp_con_lock, flags); + + /* Remove buffer from outqueue */ + list_del(&buffer->list); + list_add_tail((struct list_head *) page, &sclp_con_pages); + + /* Check if there is a pending buffer on the out queue. */ + buffer = NULL; + if (!list_empty(&sclp_con_outqueue)) + buffer = list_first_entry(&sclp_con_outqueue, + struct sclp_buffer, list); + if (!buffer || sclp_con_suspended) { + sclp_con_queue_running = 0; + spin_unlock_irqrestore(&sclp_con_lock, flags); + break; + } + spin_unlock_irqrestore(&sclp_con_lock, flags); + } while (sclp_emit_buffer(buffer, sclp_conbuf_callback)); +} + +/* + * Finalize and emit first pending buffer. + */ +static void sclp_conbuf_emit(void) +{ + struct sclp_buffer* buffer; + unsigned long flags; + int rc; + + spin_lock_irqsave(&sclp_con_lock, flags); + if (sclp_conbuf) + list_add_tail(&sclp_conbuf->list, &sclp_con_outqueue); + sclp_conbuf = NULL; + if (sclp_con_queue_running || sclp_con_suspended) + goto out_unlock; + if (list_empty(&sclp_con_outqueue)) + goto out_unlock; + buffer = list_first_entry(&sclp_con_outqueue, struct sclp_buffer, + list); + sclp_con_queue_running = 1; + spin_unlock_irqrestore(&sclp_con_lock, flags); + + rc = sclp_emit_buffer(buffer, sclp_conbuf_callback); + if (rc) + sclp_conbuf_callback(buffer, rc); + return; +out_unlock: + spin_unlock_irqrestore(&sclp_con_lock, flags); +} + +/* + * Wait until out queue is empty + */ +static void sclp_console_sync_queue(void) +{ + unsigned long flags; + + spin_lock_irqsave(&sclp_con_lock, flags); + if (timer_pending(&sclp_con_timer)) + del_timer(&sclp_con_timer); + while (sclp_con_queue_running) { + spin_unlock_irqrestore(&sclp_con_lock, flags); + sclp_sync_wait(); + spin_lock_irqsave(&sclp_con_lock, flags); + } + spin_unlock_irqrestore(&sclp_con_lock, flags); +} + +/* + * When this routine is called from the timer then we flush the + * temporary write buffer without further waiting on a final new line. + */ +static void +sclp_console_timeout(struct timer_list *unused) +{ + sclp_conbuf_emit(); +} + +/* + * Drop oldest console buffer if sclp_con_drop is set + */ +static int +sclp_console_drop_buffer(void) +{ + struct list_head *list; + struct sclp_buffer *buffer; + void *page; + + if (!sclp_console_drop) + return 0; + list = sclp_con_outqueue.next; + if (sclp_con_queue_running) + /* The first element is in I/O */ + list = list->next; + if (list == &sclp_con_outqueue) + return 0; + list_del(list); + buffer = list_entry(list, struct sclp_buffer, list); + page = sclp_unmake_buffer(buffer); + list_add_tail((struct list_head *) page, &sclp_con_pages); + return 1; +} + +/* + * Writes the given message to S390 system console + */ +static void +sclp_console_write(struct console *console, const char *message, + unsigned int count) +{ + unsigned long flags; + void *page; + int written; + + if (count == 0) + return; + spin_lock_irqsave(&sclp_con_lock, flags); + /* + * process escape characters, write message into buffer, + * send buffer to SCLP + */ + do { + /* make sure we have a console output buffer */ + if (sclp_conbuf == NULL) { + if (list_empty(&sclp_con_pages)) + sclp_console_full++; + while (list_empty(&sclp_con_pages)) { + if (sclp_con_suspended) + goto out; + if (sclp_console_drop_buffer()) + break; + spin_unlock_irqrestore(&sclp_con_lock, flags); + sclp_sync_wait(); + spin_lock_irqsave(&sclp_con_lock, flags); + } + page = sclp_con_pages.next; + list_del((struct list_head *) page); + sclp_conbuf = sclp_make_buffer(page, sclp_con_columns, + sclp_con_width_htab); + } + /* try to write the string to the current output buffer */ + written = sclp_write(sclp_conbuf, (const unsigned char *) + message, count); + if (written == count) + break; + /* + * Not all characters could be written to the current + * output buffer. Emit the buffer, create a new buffer + * and then output the rest of the string. + */ + spin_unlock_irqrestore(&sclp_con_lock, flags); + sclp_conbuf_emit(); + spin_lock_irqsave(&sclp_con_lock, flags); + message += written; + count -= written; + } while (count > 0); + /* Setup timer to output current console buffer after 1/10 second */ + if (sclp_conbuf != NULL && sclp_chars_in_buffer(sclp_conbuf) != 0 && + !timer_pending(&sclp_con_timer)) { + mod_timer(&sclp_con_timer, jiffies + HZ / 10); + } +out: + spin_unlock_irqrestore(&sclp_con_lock, flags); +} + +static struct tty_driver * +sclp_console_device(struct console *c, int *index) +{ + *index = c->index; + return sclp_tty_driver; +} + +/* + * Make sure that all buffers will be flushed to the SCLP. + */ +static void +sclp_console_flush(void) +{ + sclp_conbuf_emit(); + sclp_console_sync_queue(); +} + +/* + * Resume console: If there are cached messages, emit them. + */ +static void sclp_console_resume(void) +{ + unsigned long flags; + + spin_lock_irqsave(&sclp_con_lock, flags); + sclp_con_suspended = 0; + spin_unlock_irqrestore(&sclp_con_lock, flags); + sclp_conbuf_emit(); +} + +/* + * Suspend console: Set suspend flag and flush console + */ +static void sclp_console_suspend(void) +{ + unsigned long flags; + + spin_lock_irqsave(&sclp_con_lock, flags); + sclp_con_suspended = 1; + spin_unlock_irqrestore(&sclp_con_lock, flags); + sclp_console_flush(); +} + +static int sclp_console_notify(struct notifier_block *self, + unsigned long event, void *data) +{ + sclp_console_flush(); + return NOTIFY_OK; +} + +static struct notifier_block on_panic_nb = { + .notifier_call = sclp_console_notify, + .priority = SCLP_PANIC_PRIO_CLIENT, +}; + +static struct notifier_block on_reboot_nb = { + .notifier_call = sclp_console_notify, + .priority = 1, +}; + +/* + * used to register the SCLP console to the kernel and to + * give printk necessary information + */ +static struct console sclp_console = +{ + .name = sclp_console_name, + .write = sclp_console_write, + .device = sclp_console_device, + .flags = CON_PRINTBUFFER, + .index = 0 /* ttyS0 */ +}; + +/* + * This function is called for SCLP suspend and resume events. + */ +void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event) +{ + switch (sclp_pm_event) { + case SCLP_PM_EVENT_FREEZE: + sclp_console_suspend(); + break; + case SCLP_PM_EVENT_RESTORE: + case SCLP_PM_EVENT_THAW: + sclp_console_resume(); + break; + } +} + +/* + * called by console_init() in drivers/char/tty_io.c at boot-time. + */ +static int __init +sclp_console_init(void) +{ + void *page; + int i; + int rc; + + /* SCLP consoles are handled together */ + if (!(CONSOLE_IS_SCLP || CONSOLE_IS_VT220)) + return 0; + rc = sclp_rw_init(); + if (rc) + return rc; + /* Allocate pages for output buffering */ + INIT_LIST_HEAD(&sclp_con_pages); + for (i = 0; i < sclp_console_pages; i++) { + page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + list_add_tail(page, &sclp_con_pages); + } + INIT_LIST_HEAD(&sclp_con_outqueue); + spin_lock_init(&sclp_con_lock); + sclp_conbuf = NULL; + timer_setup(&sclp_con_timer, sclp_console_timeout, 0); + + /* Set output format */ + if (MACHINE_IS_VM) + /* + * save 4 characters for the CPU number + * written at start of each line by VM/CP + */ + sclp_con_columns = 76; + else + sclp_con_columns = 80; + sclp_con_width_htab = 8; + + /* enable printk-access to this driver */ + atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); + register_reboot_notifier(&on_reboot_nb); + register_console(&sclp_console); + return 0; +} + +console_initcall(sclp_console_init); diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c new file mode 100644 index 000000000..039b2074d --- /dev/null +++ b/drivers/s390/char/sclp_config.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2007 + * Author(s): Heiko Carstens + */ + +#define KMSG_COMPONENT "sclp_config" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" + +struct conf_mgm_data { + u8 reserved; + u8 ev_qualifier; +} __attribute__((packed)); + +#define OFB_DATA_MAX 64 + +struct sclp_ofb_evbuf { + struct evbuf_header header; + struct conf_mgm_data cm_data; + char ev_data[OFB_DATA_MAX]; +} __packed; + +struct sclp_ofb_sccb { + struct sccb_header header; + struct sclp_ofb_evbuf ofb_evbuf; +} __packed; + +#define EV_QUAL_CPU_CHANGE 1 +#define EV_QUAL_CAP_CHANGE 3 +#define EV_QUAL_OPEN4BUSINESS 5 + +static struct work_struct sclp_cpu_capability_work; +static struct work_struct sclp_cpu_change_work; + +static void sclp_cpu_capability_notify(struct work_struct *work) +{ + int cpu; + struct device *dev; + + s390_update_cpu_mhz(); + pr_info("CPU capability may have changed\n"); + get_online_cpus(); + for_each_online_cpu(cpu) { + dev = get_cpu_device(cpu); + kobject_uevent(&dev->kobj, KOBJ_CHANGE); + } + put_online_cpus(); +} + +static void __ref sclp_cpu_change_notify(struct work_struct *work) +{ + lock_device_hotplug(); + smp_rescan_cpus(); + unlock_device_hotplug(); +} + +static void sclp_conf_receiver_fn(struct evbuf_header *evbuf) +{ + struct conf_mgm_data *cdata; + + cdata = (struct conf_mgm_data *)(evbuf + 1); + switch (cdata->ev_qualifier) { + case EV_QUAL_CPU_CHANGE: + schedule_work(&sclp_cpu_change_work); + break; + case EV_QUAL_CAP_CHANGE: + schedule_work(&sclp_cpu_capability_work); + break; + } +} + +static struct sclp_register sclp_conf_register = +{ +#ifdef CONFIG_SCLP_OFB + .send_mask = EVTYP_CONFMGMDATA_MASK, +#endif + .receive_mask = EVTYP_CONFMGMDATA_MASK, + .receiver_fn = sclp_conf_receiver_fn, +}; + +#ifdef CONFIG_SCLP_OFB +static int sclp_ofb_send_req(char *ev_data, size_t len) +{ + static DEFINE_MUTEX(send_mutex); + struct sclp_ofb_sccb *sccb; + int rc, response; + + if (len > OFB_DATA_MAX) + return -EINVAL; + sccb = (struct sclp_ofb_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + /* Setup SCCB for Control-Program Identification */ + sccb->header.length = sizeof(struct sclp_ofb_sccb); + sccb->ofb_evbuf.header.length = sizeof(struct sclp_ofb_evbuf); + sccb->ofb_evbuf.header.type = EVTYP_CONFMGMDATA; + sccb->ofb_evbuf.cm_data.ev_qualifier = EV_QUAL_OPEN4BUSINESS; + memcpy(sccb->ofb_evbuf.ev_data, ev_data, len); + + if (!(sclp_conf_register.sclp_receive_mask & EVTYP_CONFMGMDATA_MASK)) + pr_warn("SCLP receiver did not register to receive " + "Configuration Management Data Events.\n"); + + mutex_lock(&send_mutex); + rc = sclp_sync_request(SCLP_CMDW_WRITE_EVENT_DATA, sccb); + mutex_unlock(&send_mutex); + if (rc) + goto out; + response = sccb->header.response_code; + if (response != 0x0020) { + pr_err("Open for Business request failed with response code " + "0x%04x\n", response); + rc = -EIO; + } +out: + free_page((unsigned long)sccb); + return rc; +} + +static ssize_t sysfs_ofb_data_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + int rc; + + rc = sclp_ofb_send_req(buf, count); + return rc ?: count; +} + +static const struct bin_attribute ofb_bin_attr = { + .attr = { + .name = "event_data", + .mode = S_IWUSR, + }, + .write = sysfs_ofb_data_write, +}; +#endif + +static int __init sclp_ofb_setup(void) +{ +#ifdef CONFIG_SCLP_OFB + struct kset *ofb_kset; + int rc; + + ofb_kset = kset_create_and_add("ofb", NULL, firmware_kobj); + if (!ofb_kset) + return -ENOMEM; + rc = sysfs_create_bin_file(&ofb_kset->kobj, &ofb_bin_attr); + if (rc) { + kset_unregister(ofb_kset); + return rc; + } +#endif + return 0; +} + +static int __init sclp_conf_init(void) +{ + int rc; + + INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify); + INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify); + rc = sclp_register(&sclp_conf_register); + if (rc) + return rc; + return sclp_ofb_setup(); +} + +__initcall(sclp_conf_init); diff --git a/drivers/s390/char/sclp_cpi_sys.c b/drivers/s390/char/sclp_cpi_sys.c new file mode 100644 index 000000000..f60d7ea82 --- /dev/null +++ b/drivers/s390/char/sclp_cpi_sys.c @@ -0,0 +1,428 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCLP control program identification sysfs interface + * + * Copyright IBM Corp. 2001, 2007 + * Author(s): Martin Peschke + * Michael Ernst + */ + +#define KMSG_COMPONENT "sclp_cpi" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" +#include "sclp_rw.h" +#include "sclp_cpi_sys.h" + +#define CPI_LENGTH_NAME 8 +#define CPI_LENGTH_LEVEL 16 + +static DEFINE_MUTEX(sclp_cpi_mutex); + +struct cpi_evbuf { + struct evbuf_header header; + u8 id_format; + u8 reserved0; + u8 system_type[CPI_LENGTH_NAME]; + u64 reserved1; + u8 system_name[CPI_LENGTH_NAME]; + u64 reserved2; + u64 system_level; + u64 reserved3; + u8 sysplex_name[CPI_LENGTH_NAME]; + u8 reserved4[16]; +} __attribute__((packed)); + +struct cpi_sccb { + struct sccb_header header; + struct cpi_evbuf cpi_evbuf; +} __attribute__((packed)); + +static struct sclp_register sclp_cpi_event = { + .send_mask = EVTYP_CTLPROGIDENT_MASK, +}; + +static char system_name[CPI_LENGTH_NAME + 1]; +static char sysplex_name[CPI_LENGTH_NAME + 1]; +static char system_type[CPI_LENGTH_NAME + 1]; +static u64 system_level; + +static void set_data(char *field, char *data) +{ + memset(field, ' ', CPI_LENGTH_NAME); + memcpy(field, data, strlen(data)); + sclp_ascebc_str(field, CPI_LENGTH_NAME); +} + +static void cpi_callback(struct sclp_req *req, void *data) +{ + struct completion *completion = data; + + complete(completion); +} + +static struct sclp_req *cpi_prepare_req(void) +{ + struct sclp_req *req; + struct cpi_sccb *sccb; + struct cpi_evbuf *evb; + + req = kzalloc(sizeof(struct sclp_req), GFP_KERNEL); + if (!req) + return ERR_PTR(-ENOMEM); + sccb = (struct cpi_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) { + kfree(req); + return ERR_PTR(-ENOMEM); + } + + /* setup SCCB for Control-Program Identification */ + sccb->header.length = sizeof(struct cpi_sccb); + sccb->cpi_evbuf.header.length = sizeof(struct cpi_evbuf); + sccb->cpi_evbuf.header.type = EVTYP_CTLPROGIDENT; + evb = &sccb->cpi_evbuf; + + /* set system type */ + set_data(evb->system_type, system_type); + + /* set system name */ + set_data(evb->system_name, system_name); + + /* set system level */ + evb->system_level = system_level; + + /* set sysplex name */ + set_data(evb->sysplex_name, sysplex_name); + + /* prepare request data structure presented to SCLP driver */ + req->command = SCLP_CMDW_WRITE_EVENT_DATA; + req->sccb = sccb; + req->status = SCLP_REQ_FILLED; + req->callback = cpi_callback; + return req; +} + +static void cpi_free_req(struct sclp_req *req) +{ + free_page((unsigned long) req->sccb); + kfree(req); +} + +static int cpi_req(void) +{ + struct completion completion; + struct sclp_req *req; + int rc; + int response; + + rc = sclp_register(&sclp_cpi_event); + if (rc) + goto out; + if (!(sclp_cpi_event.sclp_receive_mask & EVTYP_CTLPROGIDENT_MASK)) { + rc = -EOPNOTSUPP; + goto out_unregister; + } + + req = cpi_prepare_req(); + if (IS_ERR(req)) { + rc = PTR_ERR(req); + goto out_unregister; + } + + init_completion(&completion); + req->callback_data = &completion; + + /* Add request to sclp queue */ + rc = sclp_add_request(req); + if (rc) + goto out_free_req; + + wait_for_completion(&completion); + + if (req->status != SCLP_REQ_DONE) { + pr_warn("request failed (status=0x%02x)\n", req->status); + rc = -EIO; + goto out_free_req; + } + + response = ((struct cpi_sccb *) req->sccb)->header.response_code; + if (response != 0x0020) { + pr_warn("request failed with response code 0x%x\n", response); + rc = -EIO; + } + +out_free_req: + cpi_free_req(req); + +out_unregister: + sclp_unregister(&sclp_cpi_event); + +out: + return rc; +} + +static int check_string(const char *attr, const char *str) +{ + size_t len; + size_t i; + + len = strlen(str); + + if ((len > 0) && (str[len - 1] == '\n')) + len--; + + if (len > CPI_LENGTH_NAME) + return -EINVAL; + + for (i = 0; i < len ; i++) { + if (isalpha(str[i]) || isdigit(str[i]) || + strchr("$@# ", str[i])) + continue; + return -EINVAL; + } + + return 0; +} + +static void set_string(char *attr, const char *value) +{ + size_t len; + size_t i; + + len = strlen(value); + + if ((len > 0) && (value[len - 1] == '\n')) + len--; + + for (i = 0; i < CPI_LENGTH_NAME; i++) { + if (i < len) + attr[i] = toupper(value[i]); + else + attr[i] = ' '; + } +} + +static ssize_t system_name_show(struct kobject *kobj, + struct kobj_attribute *attr, char *page) +{ + int rc; + + mutex_lock(&sclp_cpi_mutex); + rc = snprintf(page, PAGE_SIZE, "%s\n", system_name); + mutex_unlock(&sclp_cpi_mutex); + return rc; +} + +static ssize_t system_name_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, + size_t len) +{ + int rc; + + rc = check_string("system_name", buf); + if (rc) + return rc; + + mutex_lock(&sclp_cpi_mutex); + set_string(system_name, buf); + mutex_unlock(&sclp_cpi_mutex); + + return len; +} + +static struct kobj_attribute system_name_attr = + __ATTR(system_name, 0644, system_name_show, system_name_store); + +static ssize_t sysplex_name_show(struct kobject *kobj, + struct kobj_attribute *attr, char *page) +{ + int rc; + + mutex_lock(&sclp_cpi_mutex); + rc = snprintf(page, PAGE_SIZE, "%s\n", sysplex_name); + mutex_unlock(&sclp_cpi_mutex); + return rc; +} + +static ssize_t sysplex_name_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, + size_t len) +{ + int rc; + + rc = check_string("sysplex_name", buf); + if (rc) + return rc; + + mutex_lock(&sclp_cpi_mutex); + set_string(sysplex_name, buf); + mutex_unlock(&sclp_cpi_mutex); + + return len; +} + +static struct kobj_attribute sysplex_name_attr = + __ATTR(sysplex_name, 0644, sysplex_name_show, sysplex_name_store); + +static ssize_t system_type_show(struct kobject *kobj, + struct kobj_attribute *attr, char *page) +{ + int rc; + + mutex_lock(&sclp_cpi_mutex); + rc = snprintf(page, PAGE_SIZE, "%s\n", system_type); + mutex_unlock(&sclp_cpi_mutex); + return rc; +} + +static ssize_t system_type_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, + size_t len) +{ + int rc; + + rc = check_string("system_type", buf); + if (rc) + return rc; + + mutex_lock(&sclp_cpi_mutex); + set_string(system_type, buf); + mutex_unlock(&sclp_cpi_mutex); + + return len; +} + +static struct kobj_attribute system_type_attr = + __ATTR(system_type, 0644, system_type_show, system_type_store); + +static ssize_t system_level_show(struct kobject *kobj, + struct kobj_attribute *attr, char *page) +{ + unsigned long long level; + + mutex_lock(&sclp_cpi_mutex); + level = system_level; + mutex_unlock(&sclp_cpi_mutex); + return snprintf(page, PAGE_SIZE, "%#018llx\n", level); +} + +static ssize_t system_level_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, + size_t len) +{ + unsigned long long level; + char *endp; + + level = simple_strtoull(buf, &endp, 16); + + if (endp == buf) + return -EINVAL; + if (*endp == '\n') + endp++; + if (*endp) + return -EINVAL; + + mutex_lock(&sclp_cpi_mutex); + system_level = level; + mutex_unlock(&sclp_cpi_mutex); + return len; +} + +static struct kobj_attribute system_level_attr = + __ATTR(system_level, 0644, system_level_show, system_level_store); + +static ssize_t set_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t len) +{ + int rc; + + mutex_lock(&sclp_cpi_mutex); + rc = cpi_req(); + mutex_unlock(&sclp_cpi_mutex); + if (rc) + return rc; + + return len; +} + +static struct kobj_attribute set_attr = __ATTR(set, 0200, NULL, set_store); + +static struct attribute *cpi_attrs[] = { + &system_name_attr.attr, + &sysplex_name_attr.attr, + &system_type_attr.attr, + &system_level_attr.attr, + &set_attr.attr, + NULL, +}; + +static struct attribute_group cpi_attr_group = { + .attrs = cpi_attrs, +}; + +static struct kset *cpi_kset; + +int sclp_cpi_set_data(const char *system, const char *sysplex, const char *type, + const u64 level) +{ + int rc; + + rc = check_string("system_name", system); + if (rc) + return rc; + rc = check_string("sysplex_name", sysplex); + if (rc) + return rc; + rc = check_string("system_type", type); + if (rc) + return rc; + + mutex_lock(&sclp_cpi_mutex); + set_string(system_name, system); + set_string(sysplex_name, sysplex); + set_string(system_type, type); + system_level = level; + + rc = cpi_req(); + mutex_unlock(&sclp_cpi_mutex); + + return rc; +} +EXPORT_SYMBOL(sclp_cpi_set_data); + +static int __init cpi_init(void) +{ + int rc; + + cpi_kset = kset_create_and_add("cpi", NULL, firmware_kobj); + if (!cpi_kset) + return -ENOMEM; + + rc = sysfs_create_group(&cpi_kset->kobj, &cpi_attr_group); + if (rc) + kset_unregister(cpi_kset); + + return rc; +} + +__initcall(cpi_init); diff --git a/drivers/s390/char/sclp_cpi_sys.h b/drivers/s390/char/sclp_cpi_sys.h new file mode 100644 index 000000000..edf60d1ca --- /dev/null +++ b/drivers/s390/char/sclp_cpi_sys.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * SCLP control program identification sysfs interface + * + * Copyright IBM Corp. 2007 + * Author(s): Michael Ernst + */ + +#ifndef __SCLP_CPI_SYS_H__ +#define __SCLP_CPI_SYS_H__ + +int sclp_cpi_set_data(const char *system, const char *sysplex, + const char *type, u64 level); + +#endif /* __SCLP_CPI_SYS_H__ */ diff --git a/drivers/s390/char/sclp_ctl.c b/drivers/s390/char/sclp_ctl.c new file mode 100644 index 000000000..248b5db3e --- /dev/null +++ b/drivers/s390/char/sclp_ctl.c @@ -0,0 +1,129 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * IOCTL interface for SCLP + * + * Copyright IBM Corp. 2012 + * + * Author: Michael Holzheu + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" + +/* + * Supported command words + */ +static unsigned int sclp_ctl_sccb_wlist[] = { + 0x00400002, + 0x00410002, +}; + +/* + * Check if command word is supported + */ +static int sclp_ctl_cmdw_supported(unsigned int cmdw) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(sclp_ctl_sccb_wlist); i++) { + if (cmdw == sclp_ctl_sccb_wlist[i]) + return 1; + } + return 0; +} + +static void __user *u64_to_uptr(u64 value) +{ + if (is_compat_task()) + return compat_ptr(value); + else + return (void __user *)(unsigned long)value; +} + +/* + * Start SCLP request + */ +static int sclp_ctl_ioctl_sccb(void __user *user_area) +{ + struct sclp_ctl_sccb ctl_sccb; + struct sccb_header *sccb; + unsigned long copied; + int rc; + + if (copy_from_user(&ctl_sccb, user_area, sizeof(ctl_sccb))) + return -EFAULT; + if (!sclp_ctl_cmdw_supported(ctl_sccb.cmdw)) + return -EOPNOTSUPP; + sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + copied = PAGE_SIZE - + copy_from_user(sccb, u64_to_uptr(ctl_sccb.sccb), PAGE_SIZE); + if (offsetof(struct sccb_header, length) + + sizeof(sccb->length) > copied || sccb->length > copied) { + rc = -EFAULT; + goto out_free; + } + if (sccb->length < 8) { + rc = -EINVAL; + goto out_free; + } + rc = sclp_sync_request(ctl_sccb.cmdw, sccb); + if (rc) + goto out_free; + if (copy_to_user(u64_to_uptr(ctl_sccb.sccb), sccb, sccb->length)) + rc = -EFAULT; +out_free: + free_page((unsigned long) sccb); + return rc; +} + +/* + * SCLP SCCB ioctl function + */ +static long sclp_ctl_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + void __user *argp; + + if (is_compat_task()) + argp = compat_ptr(arg); + else + argp = (void __user *) arg; + switch (cmd) { + case SCLP_CTL_SCCB: + return sclp_ctl_ioctl_sccb(argp); + default: /* unknown ioctl number */ + return -ENOTTY; + } +} + +/* + * File operations + */ +static const struct file_operations sclp_ctl_fops = { + .owner = THIS_MODULE, + .open = nonseekable_open, + .unlocked_ioctl = sclp_ctl_ioctl, + .compat_ioctl = sclp_ctl_ioctl, + .llseek = no_llseek, +}; + +/* + * Misc device definition + */ +static struct miscdevice sclp_ctl_device = { + .minor = MISC_DYNAMIC_MINOR, + .name = "sclp", + .fops = &sclp_ctl_fops, +}; +builtin_misc_device(sclp_ctl_device); diff --git a/drivers/s390/char/sclp_diag.h b/drivers/s390/char/sclp_diag.h new file mode 100644 index 000000000..796c5311b --- /dev/null +++ b/drivers/s390/char/sclp_diag.h @@ -0,0 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + */ + +#ifndef _SCLP_DIAG_H +#define _SCLP_DIAG_H + +#include + +/* return codes for Diagnostic Test FTP Service, as indicated in member + * sclp_diag_ftp::ldflg + */ +#define SCLP_DIAG_FTP_OK 0x80U /* success */ +#define SCLP_DIAG_FTP_LDFAIL 0x01U /* load failed */ +#define SCLP_DIAG_FTP_LDNPERM 0x02U /* not allowed */ +#define SCLP_DIAG_FTP_LDRUNS 0x03U /* LD runs */ +#define SCLP_DIAG_FTP_LDNRUNS 0x04U /* LD does not run */ + +#define SCLP_DIAG_FTP_XPCX 0x80 /* PCX communication code */ +#define SCLP_DIAG_FTP_ROUTE 4 /* routing code for new FTP service */ + +/* + * length of Diagnostic Test FTP Service event buffer + */ +#define SCLP_DIAG_FTP_EVBUF_LEN \ + (offsetof(struct sclp_diag_evbuf, mdd) + \ + sizeof(struct sclp_diag_ftp)) + +/** + * struct sclp_diag_ftp - Diagnostic Test FTP Service model-dependent data + * @pcx: code for PCX communication (should be 0x80) + * @ldflg: load flag (see defines above) + * @cmd: FTP command + * @pgsize: page size (0 = 4kB, 1 = large page size) + * @srcflg: source flag + * @spare: reserved (zeroes) + * @offset: file offset + * @fsize: file size + * @length: buffer size resp. bytes transferred + * @failaddr: failing address + * @bufaddr: buffer address, virtual + * @asce: region or segment table designation + * @fident: file name (ASCII, zero-terminated) + */ +struct sclp_diag_ftp { + u8 pcx; + u8 ldflg; + u8 cmd; + u8 pgsize; + u8 srcflg; + u8 spare; + u64 offset; + u64 fsize; + u64 length; + u64 failaddr; + u64 bufaddr; + u64 asce; + + u8 fident[256]; +} __packed; + +/** + * struct sclp_diag_evbuf - Diagnostic Test (ET7) Event Buffer + * @hdr: event buffer header + * @route: diagnostic route + * @mdd: model-dependent data (@route dependent) + */ +struct sclp_diag_evbuf { + struct evbuf_header hdr; + u16 route; + + union { + struct sclp_diag_ftp ftp; + } mdd; +} __packed; + +/** + * struct sclp_diag_sccb - Diagnostic Test (ET7) SCCB + * @hdr: SCCB header + * @evbuf: event buffer + */ +struct sclp_diag_sccb { + + struct sccb_header hdr; + struct sclp_diag_evbuf evbuf; +} __packed; + +#endif /* _SCLP_DIAG_H */ diff --git a/drivers/s390/char/sclp_early.c b/drivers/s390/char/sclp_early.c new file mode 100644 index 000000000..9a74abb92 --- /dev/null +++ b/drivers/s390/char/sclp_early.c @@ -0,0 +1,273 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCLP early driver + * + * Copyright IBM Corp. 2013 + */ + +#define KMSG_COMPONENT "sclp_early" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include "sclp_sdias.h" +#include "sclp.h" + +#define SCLP_CMDW_READ_SCP_INFO 0x00020001 +#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 + +struct read_info_sccb { + struct sccb_header header; /* 0-7 */ + u16 rnmax; /* 8-9 */ + u8 rnsize; /* 10 */ + u8 _pad_11[16 - 11]; /* 11-15 */ + u16 ncpurl; /* 16-17 */ + u16 cpuoff; /* 18-19 */ + u8 _pad_20[24 - 20]; /* 20-23 */ + u8 loadparm[8]; /* 24-31 */ + u8 _pad_32[42 - 32]; /* 32-41 */ + u8 fac42; /* 42 */ + u8 fac43; /* 43 */ + u8 _pad_44[48 - 44]; /* 44-47 */ + u64 facilities; /* 48-55 */ + u8 _pad_56[66 - 56]; /* 56-65 */ + u8 fac66; /* 66 */ + u8 _pad_67[76 - 67]; /* 67-83 */ + u32 ibc; /* 76-79 */ + u8 _pad80[84 - 80]; /* 80-83 */ + u8 fac84; /* 84 */ + u8 fac85; /* 85 */ + u8 _pad_86[91 - 86]; /* 86-90 */ + u8 fac91; /* 91 */ + u8 _pad_92[98 - 92]; /* 92-97 */ + u8 fac98; /* 98 */ + u8 hamaxpow; /* 99 */ + u32 rnsize2; /* 100-103 */ + u64 rnmax2; /* 104-111 */ + u8 _pad_112[116 - 112]; /* 112-115 */ + u8 fac116; /* 116 */ + u8 fac117; /* 117 */ + u8 fac118; /* 118 */ + u8 fac119; /* 119 */ + u16 hcpua; /* 120-121 */ + u8 _pad_122[124 - 122]; /* 122-123 */ + u32 hmfai; /* 124-127 */ + u8 _pad_128[4096 - 128]; /* 128-4095 */ +} __packed __aligned(PAGE_SIZE); + +static struct sclp_ipl_info sclp_ipl_info; + +struct sclp_info sclp; +EXPORT_SYMBOL(sclp); + +static int __init sclp_early_read_info(struct read_info_sccb *sccb) +{ + int i; + sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, + SCLP_CMDW_READ_SCP_INFO}; + + for (i = 0; i < ARRAY_SIZE(commands); i++) { + memset(sccb, 0, sizeof(*sccb)); + sccb->header.length = sizeof(*sccb); + sccb->header.function_code = 0x80; + sccb->header.control_mask[2] = 0x80; + if (sclp_early_cmd(commands[i], sccb)) + break; + if (sccb->header.response_code == 0x10) + return 0; + if (sccb->header.response_code != 0x1f0) + break; + } + return -EIO; +} + +static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb) +{ + struct sclp_core_entry *cpue; + u16 boot_cpu_address, cpu; + + if (sclp_early_read_info(sccb)) + return; + + sclp.facilities = sccb->facilities; + sclp.has_sprp = !!(sccb->fac84 & 0x02); + sclp.has_core_type = !!(sccb->fac84 & 0x01); + sclp.has_gsls = !!(sccb->fac85 & 0x80); + sclp.has_64bscao = !!(sccb->fac116 & 0x80); + sclp.has_cmma = !!(sccb->fac116 & 0x40); + sclp.has_esca = !!(sccb->fac116 & 0x08); + sclp.has_pfmfi = !!(sccb->fac117 & 0x40); + sclp.has_ibs = !!(sccb->fac117 & 0x20); + sclp.has_gisaf = !!(sccb->fac118 & 0x08); + sclp.has_hvs = !!(sccb->fac119 & 0x80); + sclp.has_kss = !!(sccb->fac98 & 0x01); + if (sccb->fac85 & 0x02) + S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; + if (sccb->fac91 & 0x40) + S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST; + sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; + sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; + sclp.rzm <<= 20; + sclp.ibc = sccb->ibc; + + if (sccb->hamaxpow && sccb->hamaxpow < 64) + sclp.hamax = (1UL << sccb->hamaxpow) - 1; + else + sclp.hamax = U64_MAX; + + if (!sccb->hcpua) { + if (MACHINE_IS_VM) + sclp.max_cores = 64; + else + sclp.max_cores = sccb->ncpurl; + } else { + sclp.max_cores = sccb->hcpua + 1; + } + + boot_cpu_address = stap(); + cpue = (void *)sccb + sccb->cpuoff; + for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { + if (boot_cpu_address != cpue->core_id) + continue; + sclp.has_siif = cpue->siif; + sclp.has_sigpif = cpue->sigpif; + sclp.has_sief2 = cpue->sief2; + sclp.has_gpere = cpue->gpere; + sclp.has_ib = cpue->ib; + sclp.has_cei = cpue->cei; + sclp.has_skey = cpue->skey; + break; + } + + /* Save IPL information */ + sclp_ipl_info.is_valid = 1; + if (sccb->fac91 & 0x2) + sclp_ipl_info.has_dump = 1; + memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); + + sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; + sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; + sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; + + sclp.hmfai = sccb->hmfai; +} + +/* + * This function will be called after sclp_early_facilities_detect(), which gets + * called from early.c code. The sclp_early_facilities_detect() function retrieves + * and saves the IPL information. + */ +void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) +{ + *info = sclp_ipl_info; +} + +static struct sclp_core_info sclp_early_core_info __initdata; +static int sclp_early_core_info_valid __initdata; + +static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb) +{ + if (!SCLP_HAS_CPU_INFO) + return; + memset(sccb, 0, sizeof(*sccb)); + sccb->header.length = sizeof(*sccb); + if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) + return; + if (sccb->header.response_code != 0x0010) + return; + sclp_fill_core_info(&sclp_early_core_info, sccb); + sclp_early_core_info_valid = 1; +} + +int __init sclp_early_get_core_info(struct sclp_core_info *info) +{ + if (!sclp_early_core_info_valid) + return -EIO; + *info = sclp_early_core_info; + return 0; +} + +static long __init sclp_early_hsa_size_init(struct sdias_sccb *sccb) +{ + memset(sccb, 0, sizeof(*sccb)); + sccb->hdr.length = sizeof(*sccb); + sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); + sccb->evbuf.hdr.type = EVTYP_SDIAS; + sccb->evbuf.event_qual = SDIAS_EQ_SIZE; + sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; + sccb->evbuf.event_id = 4712; + sccb->evbuf.dbs = 1; + if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) + return -EIO; + if (sccb->hdr.response_code != 0x20) + return -EIO; + if (sccb->evbuf.blk_cnt == 0) + return 0; + return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; +} + +static long __init sclp_early_hsa_copy_wait(struct sdias_sccb *sccb) +{ + memset(sccb, 0, PAGE_SIZE); + sccb->hdr.length = PAGE_SIZE; + if (sclp_early_cmd(SCLP_CMDW_READ_EVENT_DATA, sccb)) + return -EIO; + if ((sccb->hdr.response_code != 0x20) && (sccb->hdr.response_code != 0x220)) + return -EIO; + if (sccb->evbuf.blk_cnt == 0) + return 0; + return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; +} + +static void __init sclp_early_hsa_size_detect(void *sccb) +{ + unsigned long flags; + long size = -EIO; + + raw_local_irq_save(flags); + if (sclp_early_set_event_mask(sccb, EVTYP_SDIAS_MASK, EVTYP_SDIAS_MASK)) + goto out; + size = sclp_early_hsa_size_init(sccb); + /* First check for synchronous response (LPAR) */ + if (size) + goto out_mask; + if (!(S390_lowcore.ext_params & 1)) + sclp_early_wait_irq(); + size = sclp_early_hsa_copy_wait(sccb); +out_mask: + sclp_early_set_event_mask(sccb, 0, 0); +out: + raw_local_irq_restore(flags); + if (size > 0) + sclp.hsa_size = size; +} + +static void __init sclp_early_console_detect(struct init_sccb *sccb) +{ + if (sccb->header.response_code != 0x20) + return; + + if (sclp_early_con_check_vt220(sccb)) + sclp.has_vt220 = 1; + + if (sclp_early_con_check_linemode(sccb)) + sclp.has_linemode = 1; +} + +void __init sclp_early_detect(void) +{ + void *sccb = &sclp_early_sccb; + + sclp_early_facilities_detect(sccb); + sclp_early_init_core_info(sccb); + sclp_early_hsa_size_detect(sccb); + + /* + * Turn off SCLP event notifications. Also save remote masks in the + * sccb. These are sufficient to detect sclp console capabilities. + */ + sclp_early_set_event_mask(sccb, 0, 0); + sclp_early_console_detect(sccb); +} diff --git a/drivers/s390/char/sclp_early_core.c b/drivers/s390/char/sclp_early_core.c new file mode 100644 index 000000000..2f61f5579 --- /dev/null +++ b/drivers/s390/char/sclp_early_core.c @@ -0,0 +1,236 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2015 + * Author(s): Martin Schwidefsky + */ + +#include +#include +#include +#include +#include +#include "sclp.h" +#include "sclp_rw.h" + +char sclp_early_sccb[PAGE_SIZE] __aligned(PAGE_SIZE) __section(.data); +int sclp_init_state __section(.data) = sclp_init_state_uninitialized; +/* + * Used to keep track of the size of the event masks. Qemu until version 2.11 + * only supports 4 and needs a workaround. + */ +bool sclp_mask_compat_mode __section(.data); + +void sclp_early_wait_irq(void) +{ + unsigned long psw_mask, addr; + psw_t psw_ext_save, psw_wait; + union ctlreg0 cr0, cr0_new; + + __ctl_store(cr0.val, 0, 0); + cr0_new.val = cr0.val & ~CR0_IRQ_SUBCLASS_MASK; + cr0_new.lap = 0; + cr0_new.sssm = 1; + __ctl_load(cr0_new.val, 0, 0); + + psw_ext_save = S390_lowcore.external_new_psw; + psw_mask = __extract_psw(); + S390_lowcore.external_new_psw.mask = psw_mask; + psw_wait.mask = psw_mask | PSW_MASK_EXT | PSW_MASK_WAIT; + S390_lowcore.ext_int_code = 0; + + do { + asm volatile( + " larl %[addr],0f\n" + " stg %[addr],%[psw_wait_addr]\n" + " stg %[addr],%[psw_ext_addr]\n" + " lpswe %[psw_wait]\n" + "0:\n" + : [addr] "=&d" (addr), + [psw_wait_addr] "=Q" (psw_wait.addr), + [psw_ext_addr] "=Q" (S390_lowcore.external_new_psw.addr) + : [psw_wait] "Q" (psw_wait) + : "cc", "memory"); + } while (S390_lowcore.ext_int_code != EXT_IRQ_SERVICE_SIG); + + S390_lowcore.external_new_psw = psw_ext_save; + __ctl_load(cr0.val, 0, 0); +} + +int sclp_early_cmd(sclp_cmdw_t cmd, void *sccb) +{ + unsigned long flags; + int rc; + + raw_local_irq_save(flags); + rc = sclp_service_call(cmd, sccb); + if (rc) + goto out; + sclp_early_wait_irq(); +out: + raw_local_irq_restore(flags); + return rc; +} + +struct write_sccb { + struct sccb_header header; + struct msg_buf msg; +} __packed; + +/* Output multi-line text using SCLP Message interface. */ +static void sclp_early_print_lm(const char *str, unsigned int len) +{ + unsigned char *ptr, *end, ch; + unsigned int count, offset; + struct write_sccb *sccb; + struct msg_buf *msg; + struct mdb *mdb; + struct mto *mto; + struct go *go; + + sccb = (struct write_sccb *) &sclp_early_sccb; + end = (unsigned char *) sccb + sizeof(sclp_early_sccb) - 1; + memset(sccb, 0, sizeof(*sccb)); + ptr = (unsigned char *) &sccb->msg.mdb.mto; + offset = 0; + do { + for (count = sizeof(*mto); offset < len; count++) { + ch = str[offset++]; + if ((ch == 0x0a) || (ptr + count > end)) + break; + ptr[count] = _ascebc[ch]; + } + mto = (struct mto *) ptr; + memset(mto, 0, sizeof(*mto)); + mto->length = count; + mto->type = 4; + mto->line_type_flags = LNTPFLGS_ENDTEXT; + ptr += count; + } while ((offset < len) && (ptr + sizeof(*mto) <= end)); + len = ptr - (unsigned char *) sccb; + sccb->header.length = len - offsetof(struct write_sccb, header); + msg = &sccb->msg; + msg->header.type = EVTYP_MSG; + msg->header.length = len - offsetof(struct write_sccb, msg.header); + mdb = &msg->mdb; + mdb->header.type = 1; + mdb->header.tag = 0xD4C4C240; + mdb->header.revision_code = 1; + mdb->header.length = len - offsetof(struct write_sccb, msg.mdb.header); + go = &mdb->go; + go->length = sizeof(*go); + go->type = 1; + sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb); +} + +struct vt220_sccb { + struct sccb_header header; + struct { + struct evbuf_header header; + char data[]; + } msg; +} __packed; + +/* Output multi-line text using SCLP VT220 interface. */ +static void sclp_early_print_vt220(const char *str, unsigned int len) +{ + struct vt220_sccb *sccb; + + sccb = (struct vt220_sccb *) &sclp_early_sccb; + if (sizeof(*sccb) + len >= sizeof(sclp_early_sccb)) + len = sizeof(sclp_early_sccb) - sizeof(*sccb); + memset(sccb, 0, sizeof(*sccb)); + memcpy(&sccb->msg.data, str, len); + sccb->header.length = sizeof(*sccb) + len; + sccb->msg.header.length = sizeof(sccb->msg) + len; + sccb->msg.header.type = EVTYP_VT220MSG; + sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb); +} + +int sclp_early_set_event_mask(struct init_sccb *sccb, + sccb_mask_t receive_mask, + sccb_mask_t send_mask) +{ +retry: + memset(sccb, 0, sizeof(*sccb)); + sccb->header.length = sizeof(*sccb); + if (sclp_mask_compat_mode) + sccb->mask_length = SCLP_MASK_SIZE_COMPAT; + else + sccb->mask_length = sizeof(sccb_mask_t); + sccb_set_recv_mask(sccb, receive_mask); + sccb_set_send_mask(sccb, send_mask); + if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_MASK, sccb)) + return -EIO; + if ((sccb->header.response_code == 0x74f0) && !sclp_mask_compat_mode) { + sclp_mask_compat_mode = true; + goto retry; + } + if (sccb->header.response_code != 0x20) + return -EIO; + return 0; +} + +unsigned int sclp_early_con_check_linemode(struct init_sccb *sccb) +{ + if (!(sccb_get_sclp_send_mask(sccb) & EVTYP_OPCMD_MASK)) + return 0; + if (!(sccb_get_sclp_recv_mask(sccb) & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))) + return 0; + return 1; +} + +unsigned int sclp_early_con_check_vt220(struct init_sccb *sccb) +{ + if (sccb_get_sclp_send_mask(sccb) & EVTYP_VT220MSG_MASK) + return 1; + return 0; +} + +static int sclp_early_setup(int disable, int *have_linemode, int *have_vt220) +{ + unsigned long receive_mask, send_mask; + struct init_sccb *sccb; + int rc; + + BUILD_BUG_ON(sizeof(struct init_sccb) > PAGE_SIZE); + + *have_linemode = *have_vt220 = 0; + sccb = (struct init_sccb *) &sclp_early_sccb; + receive_mask = disable ? 0 : EVTYP_OPCMD_MASK; + send_mask = disable ? 0 : EVTYP_VT220MSG_MASK | EVTYP_MSG_MASK; + rc = sclp_early_set_event_mask(sccb, receive_mask, send_mask); + if (rc) + return rc; + *have_linemode = sclp_early_con_check_linemode(sccb); + *have_vt220 = !!(sccb_get_send_mask(sccb) & EVTYP_VT220MSG_MASK); + return rc; +} + +/* + * Output one or more lines of text on the SCLP console (VT220 and / + * or line-mode). + */ +void __sclp_early_printk(const char *str, unsigned int len, unsigned int force) +{ + int have_linemode, have_vt220; + + if (!force && sclp_init_state != sclp_init_state_uninitialized) + return; + if (sclp_early_setup(0, &have_linemode, &have_vt220) != 0) + return; + if (have_linemode) + sclp_early_print_lm(str, len); + if (have_vt220) + sclp_early_print_vt220(str, len); + sclp_early_setup(1, &have_linemode, &have_vt220); +} + +void sclp_early_printk(const char *str) +{ + __sclp_early_printk(str, strlen(str), 0); +} + +void sclp_early_printk_force(const char *str) +{ + __sclp_early_printk(str, strlen(str), 1); +} diff --git a/drivers/s390/char/sclp_ftp.c b/drivers/s390/char/sclp_ftp.c new file mode 100644 index 000000000..dfdd6c8fd --- /dev/null +++ b/drivers/s390/char/sclp_ftp.c @@ -0,0 +1,276 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCLP Event Type (ET) 7 - Diagnostic Test FTP Services, useable on LPAR + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + * + */ + +#define KMSG_COMPONENT "hmcdrv" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" +#include "sclp_diag.h" +#include "sclp_ftp.h" + +static DECLARE_COMPLETION(sclp_ftp_rx_complete); +static u8 sclp_ftp_ldflg; +static u64 sclp_ftp_fsize; +static u64 sclp_ftp_length; + +/** + * sclp_ftp_txcb() - Diagnostic Test FTP services SCLP command callback + */ +static void sclp_ftp_txcb(struct sclp_req *req, void *data) +{ + struct completion *completion = data; + +#ifdef DEBUG + pr_debug("SCLP (ET7) TX-IRQ, SCCB @ 0x%p: %*phN\n", + req->sccb, 24, req->sccb); +#endif + complete(completion); +} + +/** + * sclp_ftp_rxcb() - Diagnostic Test FTP services receiver event callback + */ +static void sclp_ftp_rxcb(struct evbuf_header *evbuf) +{ + struct sclp_diag_evbuf *diag = (struct sclp_diag_evbuf *) evbuf; + + /* + * Check for Diagnostic Test FTP Service + */ + if (evbuf->type != EVTYP_DIAG_TEST || + diag->route != SCLP_DIAG_FTP_ROUTE || + diag->mdd.ftp.pcx != SCLP_DIAG_FTP_XPCX || + evbuf->length < SCLP_DIAG_FTP_EVBUF_LEN) + return; + +#ifdef DEBUG + pr_debug("SCLP (ET7) RX-IRQ, Event @ 0x%p: %*phN\n", + evbuf, 24, evbuf); +#endif + + /* + * Because the event buffer is located in a page which is owned + * by the SCLP core, all data of interest must be copied. The + * error indication is in 'sclp_ftp_ldflg' + */ + sclp_ftp_ldflg = diag->mdd.ftp.ldflg; + sclp_ftp_fsize = diag->mdd.ftp.fsize; + sclp_ftp_length = diag->mdd.ftp.length; + + complete(&sclp_ftp_rx_complete); +} + +/** + * sclp_ftp_et7() - start a Diagnostic Test FTP Service SCLP request + * @ftp: pointer to FTP descriptor + * + * Return: 0 on success, else a (negative) error code + */ +static int sclp_ftp_et7(const struct hmcdrv_ftp_cmdspec *ftp) +{ + struct completion completion; + struct sclp_diag_sccb *sccb; + struct sclp_req *req; + size_t len; + int rc; + + req = kzalloc(sizeof(*req), GFP_KERNEL); + sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!req || !sccb) { + rc = -ENOMEM; + goto out_free; + } + + sccb->hdr.length = SCLP_DIAG_FTP_EVBUF_LEN + + sizeof(struct sccb_header); + sccb->evbuf.hdr.type = EVTYP_DIAG_TEST; + sccb->evbuf.hdr.length = SCLP_DIAG_FTP_EVBUF_LEN; + sccb->evbuf.hdr.flags = 0; /* clear processed-buffer */ + sccb->evbuf.route = SCLP_DIAG_FTP_ROUTE; + sccb->evbuf.mdd.ftp.pcx = SCLP_DIAG_FTP_XPCX; + sccb->evbuf.mdd.ftp.srcflg = 0; + sccb->evbuf.mdd.ftp.pgsize = 0; + sccb->evbuf.mdd.ftp.asce = _ASCE_REAL_SPACE; + sccb->evbuf.mdd.ftp.ldflg = SCLP_DIAG_FTP_LDFAIL; + sccb->evbuf.mdd.ftp.fsize = 0; + sccb->evbuf.mdd.ftp.cmd = ftp->id; + sccb->evbuf.mdd.ftp.offset = ftp->ofs; + sccb->evbuf.mdd.ftp.length = ftp->len; + sccb->evbuf.mdd.ftp.bufaddr = virt_to_phys(ftp->buf); + + len = strlcpy(sccb->evbuf.mdd.ftp.fident, ftp->fname, + HMCDRV_FTP_FIDENT_MAX); + if (len >= HMCDRV_FTP_FIDENT_MAX) { + rc = -EINVAL; + goto out_free; + } + + req->command = SCLP_CMDW_WRITE_EVENT_DATA; + req->sccb = sccb; + req->status = SCLP_REQ_FILLED; + req->callback = sclp_ftp_txcb; + req->callback_data = &completion; + + init_completion(&completion); + + rc = sclp_add_request(req); + if (rc) + goto out_free; + + /* Wait for end of ftp sclp command. */ + wait_for_completion(&completion); + +#ifdef DEBUG + pr_debug("status of SCLP (ET7) request is 0x%04x (0x%02x)\n", + sccb->hdr.response_code, sccb->evbuf.hdr.flags); +#endif + + /* + * Check if sclp accepted the request. The data transfer runs + * asynchronously and the completion is indicated with an + * sclp ET7 event. + */ + if (req->status != SCLP_REQ_DONE || + (sccb->evbuf.hdr.flags & 0x80) == 0 || /* processed-buffer */ + (sccb->hdr.response_code & 0xffU) != 0x20U) { + rc = -EIO; + } + +out_free: + free_page((unsigned long) sccb); + kfree(req); + return rc; +} + +/** + * sclp_ftp_cmd() - executes a HMC related SCLP Diagnose (ET7) FTP command + * @ftp: pointer to FTP command specification + * @fsize: return of file size (or NULL if undesirable) + * + * Attention: Notice that this function is not reentrant - so the caller + * must ensure locking. + * + * Return: number of bytes read/written or a (negative) error code + */ +ssize_t sclp_ftp_cmd(const struct hmcdrv_ftp_cmdspec *ftp, size_t *fsize) +{ + ssize_t len; +#ifdef DEBUG + unsigned long start_jiffies; + + pr_debug("starting SCLP (ET7), cmd %d for '%s' at %lld with %zd bytes\n", + ftp->id, ftp->fname, (long long) ftp->ofs, ftp->len); + start_jiffies = jiffies; +#endif + + init_completion(&sclp_ftp_rx_complete); + + /* Start ftp sclp command. */ + len = sclp_ftp_et7(ftp); + if (len) + goto out_unlock; + + /* + * There is no way to cancel the sclp ET7 request, the code + * needs to wait unconditionally until the transfer is complete. + */ + wait_for_completion(&sclp_ftp_rx_complete); + +#ifdef DEBUG + pr_debug("completed SCLP (ET7) request after %lu ms (all)\n", + (jiffies - start_jiffies) * 1000 / HZ); + pr_debug("return code of SCLP (ET7) FTP Service is 0x%02x, with %lld/%lld bytes\n", + sclp_ftp_ldflg, sclp_ftp_length, sclp_ftp_fsize); +#endif + + switch (sclp_ftp_ldflg) { + case SCLP_DIAG_FTP_OK: + len = sclp_ftp_length; + if (fsize) + *fsize = sclp_ftp_fsize; + break; + case SCLP_DIAG_FTP_LDNPERM: + len = -EPERM; + break; + case SCLP_DIAG_FTP_LDRUNS: + len = -EBUSY; + break; + case SCLP_DIAG_FTP_LDFAIL: + len = -ENOENT; + break; + default: + len = -EIO; + break; + } + +out_unlock: + return len; +} + +/* + * ET7 event listener + */ +static struct sclp_register sclp_ftp_event = { + .send_mask = EVTYP_DIAG_TEST_MASK, /* want tx events */ + .receive_mask = EVTYP_DIAG_TEST_MASK, /* want rx events */ + .receiver_fn = sclp_ftp_rxcb, /* async callback (rx) */ + .state_change_fn = NULL, + .pm_event_fn = NULL, +}; + +/** + * sclp_ftp_startup() - startup of FTP services, when running on LPAR + */ +int sclp_ftp_startup(void) +{ +#ifdef DEBUG + unsigned long info; +#endif + int rc; + + rc = sclp_register(&sclp_ftp_event); + if (rc) + return rc; + +#ifdef DEBUG + info = get_zeroed_page(GFP_KERNEL); + + if (info != 0) { + struct sysinfo_2_2_2 *info222 = (struct sysinfo_2_2_2 *)info; + + if (!stsi(info222, 2, 2, 2)) { /* get SYSIB 2.2.2 */ + info222->name[sizeof(info222->name) - 1] = '\0'; + EBCASC_500(info222->name, sizeof(info222->name) - 1); + pr_debug("SCLP (ET7) FTP Service working on LPAR %u (%s)\n", + info222->lpar_number, info222->name); + } + + free_page(info); + } +#endif /* DEBUG */ + return 0; +} + +/** + * sclp_ftp_shutdown() - shutdown of FTP services, when running on LPAR + */ +void sclp_ftp_shutdown(void) +{ + sclp_unregister(&sclp_ftp_event); +} diff --git a/drivers/s390/char/sclp_ftp.h b/drivers/s390/char/sclp_ftp.h new file mode 100644 index 000000000..d64da18c1 --- /dev/null +++ b/drivers/s390/char/sclp_ftp.h @@ -0,0 +1,22 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * SCLP Event Type (ET) 7 - Diagnostic Test FTP Services, useable on LPAR + * + * Notice that all functions exported here are not reentrant. + * So usage should be exclusive, ensured by the caller (e.g. using a + * mutex). + * + * Copyright IBM Corp. 2013 + * Author(s): Ralf Hoppe (rhoppe@de.ibm.com) + */ + +#ifndef __SCLP_FTP_H__ +#define __SCLP_FTP_H__ + +#include "hmcdrv_ftp.h" + +int sclp_ftp_startup(void); +void sclp_ftp_shutdown(void); +ssize_t sclp_ftp_cmd(const struct hmcdrv_ftp_cmdspec *ftp, size_t *fsize); + +#endif /* __SCLP_FTP_H__ */ diff --git a/drivers/s390/char/sclp_ocf.c b/drivers/s390/char/sclp_ocf.c new file mode 100644 index 000000000..d35f10ea5 --- /dev/null +++ b/drivers/s390/char/sclp_ocf.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCLP OCF communication parameters sysfs interface + * + * Copyright IBM Corp. 2011 + * Author(s): Martin Schwidefsky + */ + +#define KMSG_COMPONENT "sclp_ocf" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" + +#define OCF_LENGTH_HMC_NETWORK 8UL +#define OCF_LENGTH_CPC_NAME 8UL + +static char hmc_network[OCF_LENGTH_HMC_NETWORK + 1]; +static char cpc_name[OCF_LENGTH_CPC_NAME]; /* in EBCDIC */ + +static DEFINE_SPINLOCK(sclp_ocf_lock); +static struct work_struct sclp_ocf_change_work; + +static struct kset *ocf_kset; + +static void sclp_ocf_change_notify(struct work_struct *work) +{ + kobject_uevent(&ocf_kset->kobj, KOBJ_CHANGE); +} + +/* Handler for OCF event. Look for the CPC image name. */ +static void sclp_ocf_handler(struct evbuf_header *evbuf) +{ + struct gds_vector *v; + struct gds_subvector *sv, *netid, *cpc; + size_t size; + + /* Find the 0x9f00 block. */ + v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length, + 0x9f00); + if (!v) + return; + /* Find the 0x9f22 block inside the 0x9f00 block. */ + v = sclp_find_gds_vector(v + 1, (void *) v + v->length, 0x9f22); + if (!v) + return; + /* Find the 0x81 block inside the 0x9f22 block. */ + sv = sclp_find_gds_subvector(v + 1, (void *) v + v->length, 0x81); + if (!sv) + return; + /* Find the 0x01 block inside the 0x81 block. */ + netid = sclp_find_gds_subvector(sv + 1, (void *) sv + sv->length, 1); + /* Find the 0x02 block inside the 0x81 block. */ + cpc = sclp_find_gds_subvector(sv + 1, (void *) sv + sv->length, 2); + /* Copy network name and cpc name. */ + spin_lock(&sclp_ocf_lock); + if (netid) { + size = min(OCF_LENGTH_HMC_NETWORK, (size_t) netid->length); + memcpy(hmc_network, netid + 1, size); + EBCASC(hmc_network, size); + hmc_network[size] = 0; + } + if (cpc) { + size = min(OCF_LENGTH_CPC_NAME, (size_t) cpc->length); + memset(cpc_name, 0, OCF_LENGTH_CPC_NAME); + memcpy(cpc_name, cpc + 1, size); + } + spin_unlock(&sclp_ocf_lock); + schedule_work(&sclp_ocf_change_work); +} + +static struct sclp_register sclp_ocf_event = { + .receive_mask = EVTYP_OCF_MASK, + .receiver_fn = sclp_ocf_handler, +}; + +void sclp_ocf_cpc_name_copy(char *dst) +{ + spin_lock_irq(&sclp_ocf_lock); + memcpy(dst, cpc_name, OCF_LENGTH_CPC_NAME); + spin_unlock_irq(&sclp_ocf_lock); +} +EXPORT_SYMBOL(sclp_ocf_cpc_name_copy); + +static ssize_t cpc_name_show(struct kobject *kobj, + struct kobj_attribute *attr, char *page) +{ + char name[OCF_LENGTH_CPC_NAME + 1]; + + sclp_ocf_cpc_name_copy(name); + name[OCF_LENGTH_CPC_NAME] = 0; + EBCASC(name, OCF_LENGTH_CPC_NAME); + return snprintf(page, PAGE_SIZE, "%s\n", name); +} + +static struct kobj_attribute cpc_name_attr = + __ATTR(cpc_name, 0444, cpc_name_show, NULL); + +static ssize_t hmc_network_show(struct kobject *kobj, + struct kobj_attribute *attr, char *page) +{ + int rc; + + spin_lock_irq(&sclp_ocf_lock); + rc = snprintf(page, PAGE_SIZE, "%s\n", hmc_network); + spin_unlock_irq(&sclp_ocf_lock); + return rc; +} + +static struct kobj_attribute hmc_network_attr = + __ATTR(hmc_network, 0444, hmc_network_show, NULL); + +static struct attribute *ocf_attrs[] = { + &cpc_name_attr.attr, + &hmc_network_attr.attr, + NULL, +}; + +static const struct attribute_group ocf_attr_group = { + .attrs = ocf_attrs, +}; + +static int __init ocf_init(void) +{ + int rc; + + INIT_WORK(&sclp_ocf_change_work, sclp_ocf_change_notify); + ocf_kset = kset_create_and_add("ocf", NULL, firmware_kobj); + if (!ocf_kset) + return -ENOMEM; + + rc = sysfs_create_group(&ocf_kset->kobj, &ocf_attr_group); + if (rc) { + kset_unregister(ocf_kset); + return rc; + } + + return sclp_register(&sclp_ocf_event); +} + +device_initcall(ocf_init); diff --git a/drivers/s390/char/sclp_pci.c b/drivers/s390/char/sclp_pci.c new file mode 100644 index 000000000..e7c84a4e5 --- /dev/null +++ b/drivers/s390/char/sclp_pci.c @@ -0,0 +1,194 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCI I/O adapter configuration related functions. + * + * Copyright IBM Corp. 2016 + */ +#define KMSG_COMPONENT "sclp_cmd" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "sclp.h" + +#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001 +#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001 + +#define SCLP_ATYPE_PCI 2 + +#define SCLP_ERRNOTIFY_AQ_REPAIR 1 +#define SCLP_ERRNOTIFY_AQ_INFO_LOG 2 + +static DEFINE_MUTEX(sclp_pci_mutex); +static struct sclp_register sclp_pci_event = { + .send_mask = EVTYP_ERRNOTIFY_MASK, +}; + +struct err_notify_evbuf { + struct evbuf_header header; + u8 action; + u8 atype; + u32 fh; + u32 fid; + u8 data[0]; +} __packed; + +struct err_notify_sccb { + struct sccb_header header; + struct err_notify_evbuf evbuf; +} __packed; + +struct pci_cfg_sccb { + struct sccb_header header; + u8 atype; /* adapter type */ + u8 reserved1; + u16 reserved2; + u32 aid; /* adapter identifier */ +} __packed; + +static int do_pci_configure(sclp_cmdw_t cmd, u32 fid) +{ + struct pci_cfg_sccb *sccb; + int rc; + + if (!SCLP_HAS_PCI_RECONFIG) + return -EOPNOTSUPP; + + sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) + return -ENOMEM; + + sccb->header.length = PAGE_SIZE; + sccb->atype = SCLP_ATYPE_PCI; + sccb->aid = fid; + rc = sclp_sync_request(cmd, sccb); + if (rc) + goto out; + switch (sccb->header.response_code) { + case 0x0020: + case 0x0120: + break; + default: + pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n", + cmd, sccb->header.response_code); + rc = -EIO; + break; + } +out: + free_page((unsigned long) sccb); + return rc; +} + +int sclp_pci_configure(u32 fid) +{ + return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid); +} +EXPORT_SYMBOL(sclp_pci_configure); + +int sclp_pci_deconfigure(u32 fid) +{ + return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid); +} +EXPORT_SYMBOL(sclp_pci_deconfigure); + +static void sclp_pci_callback(struct sclp_req *req, void *data) +{ + struct completion *completion = data; + + complete(completion); +} + +static int sclp_pci_check_report(struct zpci_report_error_header *report) +{ + if (report->version != 1) + return -EINVAL; + + if (report->action != SCLP_ERRNOTIFY_AQ_REPAIR && + report->action != SCLP_ERRNOTIFY_AQ_INFO_LOG) + return -EINVAL; + + if (report->length > (PAGE_SIZE - sizeof(struct err_notify_sccb))) + return -EINVAL; + + return 0; +} + +int sclp_pci_report(struct zpci_report_error_header *report, u32 fh, u32 fid) +{ + DECLARE_COMPLETION_ONSTACK(completion); + struct err_notify_sccb *sccb; + struct sclp_req req; + int ret; + + ret = sclp_pci_check_report(report); + if (ret) + return ret; + + mutex_lock(&sclp_pci_mutex); + ret = sclp_register(&sclp_pci_event); + if (ret) + goto out_unlock; + + if (!(sclp_pci_event.sclp_receive_mask & EVTYP_ERRNOTIFY_MASK)) { + ret = -EOPNOTSUPP; + goto out_unregister; + } + + sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccb) { + ret = -ENOMEM; + goto out_unregister; + } + + memset(&req, 0, sizeof(req)); + req.callback_data = &completion; + req.callback = sclp_pci_callback; + req.command = SCLP_CMDW_WRITE_EVENT_DATA; + req.status = SCLP_REQ_FILLED; + req.sccb = sccb; + + sccb->evbuf.header.length = sizeof(sccb->evbuf) + report->length; + sccb->evbuf.header.type = EVTYP_ERRNOTIFY; + sccb->header.length = sizeof(sccb->header) + sccb->evbuf.header.length; + + sccb->evbuf.action = report->action; + sccb->evbuf.atype = SCLP_ATYPE_PCI; + sccb->evbuf.fh = fh; + sccb->evbuf.fid = fid; + + memcpy(sccb->evbuf.data, report->data, report->length); + + ret = sclp_add_request(&req); + if (ret) + goto out_free_req; + + wait_for_completion(&completion); + if (req.status != SCLP_REQ_DONE) { + pr_warn("request failed (status=0x%02x)\n", + req.status); + ret = -EIO; + goto out_free_req; + } + + if (sccb->header.response_code != 0x0020) { + pr_warn("request failed with response code 0x%x\n", + sccb->header.response_code); + ret = -EIO; + } + +out_free_req: + free_page((unsigned long) sccb); +out_unregister: + sclp_unregister(&sclp_pci_event); +out_unlock: + mutex_unlock(&sclp_pci_mutex); + return ret; +} diff --git a/drivers/s390/char/sclp_quiesce.c b/drivers/s390/char/sclp_quiesce.c new file mode 100644 index 000000000..76956c213 --- /dev/null +++ b/drivers/s390/char/sclp_quiesce.c @@ -0,0 +1,83 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * signal quiesce handler + * + * Copyright IBM Corp. 1999, 2004 + * Author(s): Martin Schwidefsky + * Peter Oberparleiter + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" + +static void (*old_machine_restart)(char *); +static void (*old_machine_halt)(void); +static void (*old_machine_power_off)(void); + +/* Shutdown handler. Signal completion of shutdown by loading special PSW. */ +static void do_machine_quiesce(void) +{ + psw_t quiesce_psw; + + smp_send_stop(); + quiesce_psw.mask = + PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA | PSW_MASK_WAIT; + quiesce_psw.addr = 0xfff; + __load_psw(quiesce_psw); +} + +/* Handler for quiesce event. Start shutdown procedure. */ +static void sclp_quiesce_handler(struct evbuf_header *evbuf) +{ + if (_machine_restart != (void *) do_machine_quiesce) { + old_machine_restart = _machine_restart; + old_machine_halt = _machine_halt; + old_machine_power_off = _machine_power_off; + _machine_restart = (void *) do_machine_quiesce; + _machine_halt = do_machine_quiesce; + _machine_power_off = do_machine_quiesce; + } + ctrl_alt_del(); +} + +/* Undo machine restart/halt/power_off modification on resume */ +static void sclp_quiesce_pm_event(struct sclp_register *reg, + enum sclp_pm_event sclp_pm_event) +{ + switch (sclp_pm_event) { + case SCLP_PM_EVENT_RESTORE: + if (old_machine_restart) { + _machine_restart = old_machine_restart; + _machine_halt = old_machine_halt; + _machine_power_off = old_machine_power_off; + old_machine_restart = NULL; + old_machine_halt = NULL; + old_machine_power_off = NULL; + } + break; + case SCLP_PM_EVENT_FREEZE: + case SCLP_PM_EVENT_THAW: + break; + } +} + +static struct sclp_register sclp_quiesce_event = { + .receive_mask = EVTYP_SIGQUIESCE_MASK, + .receiver_fn = sclp_quiesce_handler, + .pm_event_fn = sclp_quiesce_pm_event +}; + +/* Initialize quiesce driver. */ +static int __init sclp_quiesce_init(void) +{ + return sclp_register(&sclp_quiesce_event); +} +device_initcall(sclp_quiesce_init); diff --git a/drivers/s390/char/sclp_rw.c b/drivers/s390/char/sclp_rw.c new file mode 100644 index 000000000..44594a492 --- /dev/null +++ b/drivers/s390/char/sclp_rw.c @@ -0,0 +1,468 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * driver: reading from and writing to system console on S/390 via SCLP + * + * Copyright IBM Corp. 1999, 2009 + * + * Author(s): Martin Peschke + * Martin Schwidefsky + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "sclp.h" +#include "sclp_rw.h" + +/* + * The room for the SCCB (only for writing) is not equal to a pages size + * (as it is specified as the maximum size in the SCLP documentation) + * because of the additional data structure described above. + */ +#define MAX_SCCB_ROOM (PAGE_SIZE - sizeof(struct sclp_buffer)) + +static void sclp_rw_pm_event(struct sclp_register *reg, + enum sclp_pm_event sclp_pm_event) +{ + sclp_console_pm_event(sclp_pm_event); +} + +/* Event type structure for write message and write priority message */ +static struct sclp_register sclp_rw_event = { + .send_mask = EVTYP_MSG_MASK, + .pm_event_fn = sclp_rw_pm_event, +}; + +/* + * Setup a sclp write buffer. Gets a page as input (4K) and returns + * a pointer to a struct sclp_buffer structure that is located at the + * end of the input page. This reduces the buffer space by a few + * bytes but simplifies things. + */ +struct sclp_buffer * +sclp_make_buffer(void *page, unsigned short columns, unsigned short htab) +{ + struct sclp_buffer *buffer; + struct sccb_header *sccb; + + sccb = (struct sccb_header *) page; + /* + * We keep the struct sclp_buffer structure at the end + * of the sccb page. + */ + buffer = ((struct sclp_buffer *) ((addr_t) sccb + PAGE_SIZE)) - 1; + buffer->sccb = sccb; + buffer->retry_count = 0; + buffer->messages = 0; + buffer->char_sum = 0; + buffer->current_line = NULL; + buffer->current_length = 0; + buffer->columns = columns; + buffer->htab = htab; + + /* initialize sccb */ + memset(sccb, 0, sizeof(struct sccb_header)); + sccb->length = sizeof(struct sccb_header); + + return buffer; +} + +/* + * Return a pointer to the original page that has been used to create + * the buffer. + */ +void * +sclp_unmake_buffer(struct sclp_buffer *buffer) +{ + return buffer->sccb; +} + +/* + * Initialize a new message the end of the provided buffer with + * enough room for max_len characters. Return 0 on success. + */ +static int +sclp_initialize_mto(struct sclp_buffer *buffer, int max_len) +{ + struct sccb_header *sccb; + struct msg_buf *msg; + struct mdb *mdb; + struct go *go; + struct mto *mto; + int msg_size; + + /* max size of new message including message text */ + msg_size = sizeof(struct msg_buf) + max_len; + + /* check if current buffer sccb can contain the mto */ + sccb = buffer->sccb; + if ((MAX_SCCB_ROOM - sccb->length) < msg_size) + return -ENOMEM; + + msg = (struct msg_buf *)((addr_t) sccb + sccb->length); + memset(msg, 0, sizeof(struct msg_buf)); + msg->header.length = sizeof(struct msg_buf); + msg->header.type = EVTYP_MSG; + + mdb = &msg->mdb; + mdb->header.length = sizeof(struct mdb); + mdb->header.type = 1; + mdb->header.tag = 0xD4C4C240; /* ebcdic "MDB " */ + mdb->header.revision_code = 1; + + go = &mdb->go; + go->length = sizeof(struct go); + go->type = 1; + + mto = &mdb->mto; + mto->length = sizeof(struct mto); + mto->type = 4; /* message text object */ + mto->line_type_flags = LNTPFLGS_ENDTEXT; /* end text */ + + /* set pointer to first byte after struct mto. */ + buffer->current_msg = msg; + buffer->current_line = (char *) (mto + 1); + buffer->current_length = 0; + + return 0; +} + +/* + * Finalize message initialized by sclp_initialize_mto(), + * updating the sizes of MTO, enclosing MDB, event buffer and SCCB. + */ +static void +sclp_finalize_mto(struct sclp_buffer *buffer) +{ + struct sccb_header *sccb; + struct msg_buf *msg; + + /* + * update values of sizes + * (SCCB, Event(Message) Buffer, Message Data Block) + */ + sccb = buffer->sccb; + msg = buffer->current_msg; + msg->header.length += buffer->current_length; + msg->mdb.header.length += buffer->current_length; + msg->mdb.mto.length += buffer->current_length; + sccb->length += msg->header.length; + + /* + * count number of buffered messages (= number of Message Text + * Objects) and number of buffered characters + * for the SCCB currently used for buffering and at all + */ + buffer->messages++; + buffer->char_sum += buffer->current_length; + + buffer->current_line = NULL; + buffer->current_length = 0; + buffer->current_msg = NULL; +} + +/* + * processing of a message including escape characters, + * returns number of characters written to the output sccb + * ("processed" means that is not guaranteed that the character have already + * been sent to the SCLP but that it will be done at least next time the SCLP + * is not busy) + */ +int +sclp_write(struct sclp_buffer *buffer, const unsigned char *msg, int count) +{ + int spaces, i_msg; + int rc; + + /* + * parse msg for escape sequences (\t,\v ...) and put formated + * msg into an mto (created by sclp_initialize_mto). + * + * We have to do this work ourselfs because there is no support for + * these characters on the native machine and only partial support + * under VM (Why does VM interpret \n but the native machine doesn't ?) + * + * Depending on i/o-control setting the message is always written + * immediately or we wait for a final new line maybe coming with the + * next message. Besides we avoid a buffer overrun by writing its + * content. + * + * RESTRICTIONS: + * + * \r and \b work within one line because we are not able to modify + * previous output that have already been accepted by the SCLP. + * + * \t combined with following \r is not correctly represented because + * \t is expanded to some spaces but \r does not know about a + * previous \t and decreases the current position by one column. + * This is in order to a slim and quick implementation. + */ + for (i_msg = 0; i_msg < count; i_msg++) { + switch (msg[i_msg]) { + case '\n': /* new line, line feed (ASCII) */ + /* check if new mto needs to be created */ + if (buffer->current_line == NULL) { + rc = sclp_initialize_mto(buffer, 0); + if (rc) + return i_msg; + } + sclp_finalize_mto(buffer); + break; + case '\a': /* bell, one for several times */ + /* set SCLP sound alarm bit in General Object */ + if (buffer->current_line == NULL) { + rc = sclp_initialize_mto(buffer, + buffer->columns); + if (rc) + return i_msg; + } + buffer->current_msg->mdb.go.general_msg_flags |= + GNRLMSGFLGS_SNDALRM; + break; + case '\t': /* horizontal tabulator */ + /* check if new mto needs to be created */ + if (buffer->current_line == NULL) { + rc = sclp_initialize_mto(buffer, + buffer->columns); + if (rc) + return i_msg; + } + /* "go to (next htab-boundary + 1, same line)" */ + do { + if (buffer->current_length >= buffer->columns) + break; + /* ok, add a blank */ + *buffer->current_line++ = 0x40; + buffer->current_length++; + } while (buffer->current_length % buffer->htab); + break; + case '\f': /* form feed */ + case '\v': /* vertical tabulator */ + /* "go to (actual column, actual line + 1)" */ + /* = new line, leading spaces */ + if (buffer->current_line != NULL) { + spaces = buffer->current_length; + sclp_finalize_mto(buffer); + rc = sclp_initialize_mto(buffer, + buffer->columns); + if (rc) + return i_msg; + memset(buffer->current_line, 0x40, spaces); + buffer->current_line += spaces; + buffer->current_length = spaces; + } else { + /* one an empty line this is the same as \n */ + rc = sclp_initialize_mto(buffer, + buffer->columns); + if (rc) + return i_msg; + sclp_finalize_mto(buffer); + } + break; + case '\b': /* backspace */ + /* "go to (actual column - 1, actual line)" */ + /* decrement counter indicating position, */ + /* do not remove last character */ + if (buffer->current_line != NULL && + buffer->current_length > 0) { + buffer->current_length--; + buffer->current_line--; + } + break; + case 0x00: /* end of string */ + /* transfer current line to SCCB */ + if (buffer->current_line != NULL) + sclp_finalize_mto(buffer); + /* skip the rest of the message including the 0 byte */ + i_msg = count - 1; + break; + default: /* no escape character */ + /* do not output unprintable characters */ + if (!isprint(msg[i_msg])) + break; + /* check if new mto needs to be created */ + if (buffer->current_line == NULL) { + rc = sclp_initialize_mto(buffer, + buffer->columns); + if (rc) + return i_msg; + } + *buffer->current_line++ = sclp_ascebc(msg[i_msg]); + buffer->current_length++; + break; + } + /* check if current mto is full */ + if (buffer->current_line != NULL && + buffer->current_length >= buffer->columns) + sclp_finalize_mto(buffer); + } + + /* return number of processed characters */ + return i_msg; +} + +/* + * Return the number of free bytes in the sccb + */ +int +sclp_buffer_space(struct sclp_buffer *buffer) +{ + struct sccb_header *sccb; + int count; + + sccb = buffer->sccb; + count = MAX_SCCB_ROOM - sccb->length; + if (buffer->current_line != NULL) + count -= sizeof(struct msg_buf) + buffer->current_length; + return count; +} + +/* + * Return number of characters in buffer + */ +int +sclp_chars_in_buffer(struct sclp_buffer *buffer) +{ + int count; + + count = buffer->char_sum; + if (buffer->current_line != NULL) + count += buffer->current_length; + return count; +} + +/* + * sets or provides some values that influence the drivers behaviour + */ +void +sclp_set_columns(struct sclp_buffer *buffer, unsigned short columns) +{ + buffer->columns = columns; + if (buffer->current_line != NULL && + buffer->current_length > buffer->columns) + sclp_finalize_mto(buffer); +} + +void +sclp_set_htab(struct sclp_buffer *buffer, unsigned short htab) +{ + buffer->htab = htab; +} + +/* + * called by sclp_console_init and/or sclp_tty_init + */ +int +sclp_rw_init(void) +{ + static int init_done = 0; + int rc; + + if (init_done) + return 0; + + rc = sclp_register(&sclp_rw_event); + if (rc == 0) + init_done = 1; + return rc; +} + +#define SCLP_BUFFER_MAX_RETRY 1 + +/* + * second half of Write Event Data-function that has to be done after + * interruption indicating completion of Service Call. + */ +static void +sclp_writedata_callback(struct sclp_req *request, void *data) +{ + int rc; + struct sclp_buffer *buffer; + struct sccb_header *sccb; + + buffer = (struct sclp_buffer *) data; + sccb = buffer->sccb; + + if (request->status == SCLP_REQ_FAILED) { + if (buffer->callback != NULL) + buffer->callback(buffer, -EIO); + return; + } + /* check SCLP response code and choose suitable action */ + switch (sccb->response_code) { + case 0x0020 : + /* Normal completion, buffer processed, message(s) sent */ + rc = 0; + break; + + case 0x0340: /* Contained SCLP equipment check */ + if (++buffer->retry_count > SCLP_BUFFER_MAX_RETRY) { + rc = -EIO; + break; + } + /* remove processed buffers and requeue rest */ + if (sclp_remove_processed((struct sccb_header *) sccb) > 0) { + /* not all buffers were processed */ + sccb->response_code = 0x0000; + buffer->request.status = SCLP_REQ_FILLED; + rc = sclp_add_request(request); + if (rc == 0) + return; + } else + rc = 0; + break; + + case 0x0040: /* SCLP equipment check */ + case 0x05f0: /* Target resource in improper state */ + if (++buffer->retry_count > SCLP_BUFFER_MAX_RETRY) { + rc = -EIO; + break; + } + /* retry request */ + sccb->response_code = 0x0000; + buffer->request.status = SCLP_REQ_FILLED; + rc = sclp_add_request(request); + if (rc == 0) + return; + break; + default: + if (sccb->response_code == 0x71f0) + rc = -ENOMEM; + else + rc = -EINVAL; + break; + } + if (buffer->callback != NULL) + buffer->callback(buffer, rc); +} + +/* + * Setup the request structure in the struct sclp_buffer to do SCLP Write + * Event Data and pass the request to the core SCLP loop. Return zero on + * success, non-zero otherwise. + */ +int +sclp_emit_buffer(struct sclp_buffer *buffer, + void (*callback)(struct sclp_buffer *, int)) +{ + /* add current line if there is one */ + if (buffer->current_line != NULL) + sclp_finalize_mto(buffer); + + /* Are there messages in the output buffer ? */ + if (buffer->messages == 0) + return -EIO; + + buffer->request.command = SCLP_CMDW_WRITE_EVENT_DATA; + buffer->request.status = SCLP_REQ_FILLED; + buffer->request.callback = sclp_writedata_callback; + buffer->request.callback_data = buffer; + buffer->request.sccb = buffer->sccb; + buffer->callback = callback; + return sclp_add_request(&buffer->request); +} diff --git a/drivers/s390/char/sclp_rw.h b/drivers/s390/char/sclp_rw.h new file mode 100644 index 000000000..a2eb22f67 --- /dev/null +++ b/drivers/s390/char/sclp_rw.h @@ -0,0 +1,99 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * interface to the SCLP-read/write driver + * + * Copyright IBM Corporation 1999, 2009 + * + * Author(s): Martin Peschke + * Martin Schwidefsky + */ + +#ifndef __SCLP_RW_H__ +#define __SCLP_RW_H__ + +#include + +struct mto { + u16 length; + u16 type; + u16 line_type_flags; + u8 alarm_control; + u8 _reserved[3]; +} __attribute__((packed)); + +struct go { + u16 length; + u16 type; + u32 domid; + u8 hhmmss_time[8]; + u8 th_time[3]; + u8 reserved_0; + u8 dddyyyy_date[7]; + u8 _reserved_1; + u16 general_msg_flags; + u8 _reserved_2[10]; + u8 originating_system_name[8]; + u8 job_guest_name[8]; +} __attribute__((packed)); + +struct mdb_header { + u16 length; + u16 type; + u32 tag; + u32 revision_code; +} __attribute__((packed)); + +struct mdb { + struct mdb_header header; + struct go go; + struct mto mto; +} __attribute__((packed)); + +struct msg_buf { + struct evbuf_header header; + struct mdb mdb; +} __attribute__((packed)); + +/* The number of empty mto buffers that can be contained in a single sccb. */ +#define NR_EMPTY_MSG_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \ + sizeof(struct sccb_header)) / sizeof(struct msg_buf)) + +/* + * data structure for information about list of SCCBs (only for writing), + * will be located at the end of a SCCBs page + */ +struct sclp_buffer { + struct list_head list; /* list_head for sccb_info chain */ + struct sclp_req request; + void *sccb; + struct msg_buf *current_msg; + char *current_line; + int current_length; + int retry_count; + /* output format settings */ + unsigned short columns; + unsigned short htab; + /* statistics about this buffer */ + unsigned int char_sum; /* # chars in sccb */ + unsigned int messages; /* # messages in sccb */ + /* Callback that is called after reaching final status. */ + void (*callback)(struct sclp_buffer *, int); +}; + +int sclp_rw_init(void); +struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short); +void *sclp_unmake_buffer(struct sclp_buffer *); +int sclp_buffer_space(struct sclp_buffer *); +int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int); +int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int)); +void sclp_set_columns(struct sclp_buffer *, unsigned short); +void sclp_set_htab(struct sclp_buffer *, unsigned short); +int sclp_chars_in_buffer(struct sclp_buffer *); + +#ifdef CONFIG_SCLP_CONSOLE +void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event); +#else +static inline void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event) { } +#endif + +#endif /* __SCLP_RW_H__ */ diff --git a/drivers/s390/char/sclp_sd.c b/drivers/s390/char/sclp_sd.c new file mode 100644 index 000000000..1e244f78f --- /dev/null +++ b/drivers/s390/char/sclp_sd.c @@ -0,0 +1,569 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCLP Store Data support and sysfs interface + * + * Copyright IBM Corp. 2017 + */ + +#define KMSG_COMPONENT "sclp_sd" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "sclp.h" + +#define SD_EQ_STORE_DATA 0 +#define SD_EQ_HALT 1 +#define SD_EQ_SIZE 2 + +#define SD_DI_CONFIG 3 + +struct sclp_sd_evbuf { + struct evbuf_header hdr; + u8 eq; + u8 di; + u8 rflags; + u64 :56; + u32 id; + u16 :16; + u8 fmt; + u8 status; + u64 sat; + u64 sa; + u32 esize; + u32 dsize; +} __packed; + +struct sclp_sd_sccb { + struct sccb_header hdr; + struct sclp_sd_evbuf evbuf; +} __packed __aligned(PAGE_SIZE); + +/** + * struct sclp_sd_data - Result of a Store Data request + * @esize_bytes: Resulting esize in bytes + * @dsize_bytes: Resulting dsize in bytes + * @data: Pointer to data - must be released using vfree() + */ +struct sclp_sd_data { + size_t esize_bytes; + size_t dsize_bytes; + void *data; +}; + +/** + * struct sclp_sd_listener - Listener for asynchronous Store Data response + * @list: For enqueueing this struct + * @id: Event ID of response to listen for + * @completion: Can be used to wait for response + * @evbuf: Contains the resulting Store Data response after completion + */ +struct sclp_sd_listener { + struct list_head list; + u32 id; + struct completion completion; + struct sclp_sd_evbuf evbuf; +}; + +/** + * struct sclp_sd_file - Sysfs representation of a Store Data entity + * @kobj: Kobject + * @data_attr: Attribute for accessing data contents + * @data_mutex: Mutex to serialize access and updates to @data + * @data: Data associated with this entity + * @di: DI value associated with this entity + */ +struct sclp_sd_file { + struct kobject kobj; + struct bin_attribute data_attr; + struct mutex data_mutex; + struct sclp_sd_data data; + u8 di; +}; +#define to_sd_file(x) container_of(x, struct sclp_sd_file, kobj) + +static struct kset *sclp_sd_kset; +static struct sclp_sd_file *config_file; + +static LIST_HEAD(sclp_sd_queue); +static DEFINE_SPINLOCK(sclp_sd_queue_lock); + +/** + * sclp_sd_listener_add() - Add listener for Store Data responses + * @listener: Listener to add + */ +static void sclp_sd_listener_add(struct sclp_sd_listener *listener) +{ + spin_lock_irq(&sclp_sd_queue_lock); + list_add_tail(&listener->list, &sclp_sd_queue); + spin_unlock_irq(&sclp_sd_queue_lock); +} + +/** + * sclp_sd_listener_remove() - Remove listener for Store Data responses + * @listener: Listener to remove + */ +static void sclp_sd_listener_remove(struct sclp_sd_listener *listener) +{ + spin_lock_irq(&sclp_sd_queue_lock); + list_del(&listener->list); + spin_unlock_irq(&sclp_sd_queue_lock); +} + +/** + * sclp_sd_listener_init() - Initialize a Store Data response listener + * @id: Event ID to listen for + * + * Initialize a listener for asynchronous Store Data responses. This listener + * can afterwards be used to wait for a specific response and to retrieve + * the associated response data. + */ +static void sclp_sd_listener_init(struct sclp_sd_listener *listener, u32 id) +{ + memset(listener, 0, sizeof(*listener)); + listener->id = id; + init_completion(&listener->completion); +} + +/** + * sclp_sd_receiver() - Receiver for Store Data events + * @evbuf_hdr: Header of received events + * + * Process Store Data events and complete listeners with matching event IDs. + */ +static void sclp_sd_receiver(struct evbuf_header *evbuf_hdr) +{ + struct sclp_sd_evbuf *evbuf = (struct sclp_sd_evbuf *) evbuf_hdr; + struct sclp_sd_listener *listener; + int found = 0; + + pr_debug("received event (id=0x%08x)\n", evbuf->id); + spin_lock(&sclp_sd_queue_lock); + list_for_each_entry(listener, &sclp_sd_queue, list) { + if (listener->id != evbuf->id) + continue; + + listener->evbuf = *evbuf; + complete(&listener->completion); + found = 1; + break; + } + spin_unlock(&sclp_sd_queue_lock); + + if (!found) + pr_debug("unsolicited event (id=0x%08x)\n", evbuf->id); +} + +static struct sclp_register sclp_sd_register = { + .send_mask = EVTYP_STORE_DATA_MASK, + .receive_mask = EVTYP_STORE_DATA_MASK, + .receiver_fn = sclp_sd_receiver, +}; + +/** + * sclp_sd_sync() - Perform Store Data request synchronously + * @page: Address of work page - must be below 2GB + * @eq: Input EQ value + * @di: Input DI value + * @sat: Input SAT value + * @sa: Input SA value used to specify the address of the target buffer + * @dsize_ptr: Optional pointer to input and output DSIZE value + * @esize_ptr: Optional pointer to output ESIZE value + * + * Perform Store Data request with specified parameters and wait for completion. + * + * Return %0 on success and store resulting DSIZE and ESIZE values in + * @dsize_ptr and @esize_ptr (if provided). Return non-zero on error. + */ +static int sclp_sd_sync(unsigned long page, u8 eq, u8 di, u64 sat, u64 sa, + u32 *dsize_ptr, u32 *esize_ptr) +{ + struct sclp_sd_sccb *sccb = (void *) page; + struct sclp_sd_listener listener; + struct sclp_sd_evbuf *evbuf; + int rc; + + sclp_sd_listener_init(&listener, (u32) (addr_t) sccb); + sclp_sd_listener_add(&listener); + + /* Prepare SCCB */ + memset(sccb, 0, PAGE_SIZE); + sccb->hdr.length = sizeof(sccb->hdr) + sizeof(sccb->evbuf); + evbuf = &sccb->evbuf; + evbuf->hdr.length = sizeof(*evbuf); + evbuf->hdr.type = EVTYP_STORE_DATA; + evbuf->eq = eq; + evbuf->di = di; + evbuf->id = listener.id; + evbuf->fmt = 1; + evbuf->sat = sat; + evbuf->sa = sa; + if (dsize_ptr) + evbuf->dsize = *dsize_ptr; + + /* Perform command */ + pr_debug("request (eq=%d, di=%d, id=0x%08x)\n", eq, di, listener.id); + rc = sclp_sync_request(SCLP_CMDW_WRITE_EVENT_DATA, sccb); + pr_debug("request done (rc=%d)\n", rc); + if (rc) + goto out; + + /* Evaluate response */ + if (sccb->hdr.response_code == 0x73f0) { + pr_debug("event not supported\n"); + rc = -EIO; + goto out_remove; + } + if (sccb->hdr.response_code != 0x0020 || !(evbuf->hdr.flags & 0x80)) { + rc = -EIO; + goto out; + } + if (!(evbuf->rflags & 0x80)) { + rc = wait_for_completion_interruptible(&listener.completion); + if (rc) + goto out; + evbuf = &listener.evbuf; + } + switch (evbuf->status) { + case 0: + if (dsize_ptr) + *dsize_ptr = evbuf->dsize; + if (esize_ptr) + *esize_ptr = evbuf->esize; + pr_debug("success (dsize=%u, esize=%u)\n", evbuf->dsize, + evbuf->esize); + break; + case 3: + rc = -ENOENT; + break; + default: + rc = -EIO; + break; + + } + +out: + if (rc && rc != -ENOENT) { + /* Provide some information about what went wrong */ + pr_warn("Store Data request failed (eq=%d, di=%d, " + "response=0x%04x, flags=0x%02x, status=%d, rc=%d)\n", + eq, di, sccb->hdr.response_code, evbuf->hdr.flags, + evbuf->status, rc); + } + +out_remove: + sclp_sd_listener_remove(&listener); + + return rc; +} + +/** + * sclp_sd_store_data() - Obtain data for specified Store Data entity + * @result: Resulting data + * @di: DI value associated with this entity + * + * Perform a series of Store Data requests to obtain the size and contents of + * the specified Store Data entity. + * + * Return: + * %0: Success - result is stored in @result. @result->data must be + * released using vfree() after use. + * %-ENOENT: No data available for this entity + * %<0: Other error + */ +static int sclp_sd_store_data(struct sclp_sd_data *result, u8 di) +{ + u32 dsize = 0, esize = 0; + unsigned long page, asce = 0; + void *data = NULL; + int rc; + + page = __get_free_page(GFP_KERNEL | GFP_DMA); + if (!page) + return -ENOMEM; + + /* Get size */ + rc = sclp_sd_sync(page, SD_EQ_SIZE, di, 0, 0, &dsize, &esize); + if (rc) + goto out; + if (dsize == 0) + goto out_result; + + /* Allocate memory */ + data = vzalloc(array_size((size_t)dsize, PAGE_SIZE)); + if (!data) { + rc = -ENOMEM; + goto out; + } + + /* Get translation table for buffer */ + asce = base_asce_alloc((unsigned long) data, dsize); + if (!asce) { + vfree(data); + rc = -ENOMEM; + goto out; + } + + /* Get data */ + rc = sclp_sd_sync(page, SD_EQ_STORE_DATA, di, asce, (u64) data, &dsize, + &esize); + if (rc) { + /* Cancel running request if interrupted */ + if (rc == -ERESTARTSYS) + sclp_sd_sync(page, SD_EQ_HALT, di, 0, 0, NULL, NULL); + vfree(data); + goto out; + } + +out_result: + result->esize_bytes = (size_t) esize * PAGE_SIZE; + result->dsize_bytes = (size_t) dsize * PAGE_SIZE; + result->data = data; + +out: + base_asce_free(asce); + free_page(page); + + return rc; +} + +/** + * sclp_sd_data_reset() - Reset Store Data result buffer + * @data: Data buffer to reset + * + * Reset @data to initial state and release associated memory. + */ +static void sclp_sd_data_reset(struct sclp_sd_data *data) +{ + vfree(data->data); + data->data = NULL; + data->dsize_bytes = 0; + data->esize_bytes = 0; +} + +/** + * sclp_sd_file_release() - Release function for sclp_sd_file object + * @kobj: Kobject embedded in sclp_sd_file object + */ +static void sclp_sd_file_release(struct kobject *kobj) +{ + struct sclp_sd_file *sd_file = to_sd_file(kobj); + + sclp_sd_data_reset(&sd_file->data); + kfree(sd_file); +} + +/** + * sclp_sd_file_update() - Update contents of sclp_sd_file object + * @sd_file: Object to update + * + * Obtain the current version of data associated with the Store Data entity + * @sd_file. + * + * On success, return %0 and generate a KOBJ_CHANGE event to indicate that the + * data may have changed. Return non-zero otherwise. + */ +static int sclp_sd_file_update(struct sclp_sd_file *sd_file) +{ + const char *name = kobject_name(&sd_file->kobj); + struct sclp_sd_data data; + int rc; + + rc = sclp_sd_store_data(&data, sd_file->di); + if (rc) { + if (rc == -ENOENT) { + pr_info("No data is available for the %s data entity\n", + name); + } + return rc; + } + + mutex_lock(&sd_file->data_mutex); + sclp_sd_data_reset(&sd_file->data); + sd_file->data = data; + mutex_unlock(&sd_file->data_mutex); + + pr_info("A %zu-byte %s data entity was retrieved\n", data.dsize_bytes, + name); + kobject_uevent(&sd_file->kobj, KOBJ_CHANGE); + + return 0; +} + +/** + * sclp_sd_file_update_async() - Wrapper for asynchronous update call + * @data: Object to update + */ +static void sclp_sd_file_update_async(void *data, async_cookie_t cookie) +{ + struct sclp_sd_file *sd_file = data; + + sclp_sd_file_update(sd_file); +} + +/** + * reload_store() - Store function for "reload" sysfs attribute + * @kobj: Kobject of sclp_sd_file object + * + * Initiate a reload of the data associated with an sclp_sd_file object. + */ +static ssize_t reload_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count) +{ + struct sclp_sd_file *sd_file = to_sd_file(kobj); + + sclp_sd_file_update(sd_file); + + return count; +} + +static struct kobj_attribute reload_attr = __ATTR_WO(reload); + +static struct attribute *sclp_sd_file_default_attrs[] = { + &reload_attr.attr, + NULL, +}; + +static struct kobj_type sclp_sd_file_ktype = { + .sysfs_ops = &kobj_sysfs_ops, + .release = sclp_sd_file_release, + .default_attrs = sclp_sd_file_default_attrs, +}; + +/** + * data_read() - Read function for "read" sysfs attribute + * @kobj: Kobject of sclp_sd_file object + * @buffer: Target buffer + * @off: Requested file offset + * @size: Requested number of bytes + * + * Store the requested portion of the Store Data entity contents into the + * specified buffer. Return the number of bytes stored on success, or %0 + * on EOF. + */ +static ssize_t data_read(struct file *file, struct kobject *kobj, + struct bin_attribute *attr, char *buffer, + loff_t off, size_t size) +{ + struct sclp_sd_file *sd_file = to_sd_file(kobj); + size_t data_size; + char *data; + + mutex_lock(&sd_file->data_mutex); + + data = sd_file->data.data; + data_size = sd_file->data.dsize_bytes; + if (!data || off >= data_size) { + size = 0; + } else { + if (off + size > data_size) + size = data_size - off; + memcpy(buffer, data + off, size); + } + + mutex_unlock(&sd_file->data_mutex); + + return size; +} + +/** + * sclp_sd_file_create() - Add a sysfs file representing a Store Data entity + * @name: Name of file + * @di: DI value associated with this entity + * + * Create a sysfs directory with the given @name located under + * + * /sys/firmware/sclp_sd/ + * + * The files in this directory can be used to access the contents of the Store + * Data entity associated with @DI. + * + * Return pointer to resulting sclp_sd_file object on success, %NULL otherwise. + * The object must be freed by calling kobject_put() on the embedded kobject + * pointer after use. + */ +static __init struct sclp_sd_file *sclp_sd_file_create(const char *name, u8 di) +{ + struct sclp_sd_file *sd_file; + int rc; + + sd_file = kzalloc(sizeof(*sd_file), GFP_KERNEL); + if (!sd_file) + return NULL; + sd_file->di = di; + mutex_init(&sd_file->data_mutex); + + /* Create kobject located under /sys/firmware/sclp_sd/ */ + sd_file->kobj.kset = sclp_sd_kset; + rc = kobject_init_and_add(&sd_file->kobj, &sclp_sd_file_ktype, NULL, + "%s", name); + if (rc) { + kobject_put(&sd_file->kobj); + return NULL; + } + + sysfs_bin_attr_init(&sd_file->data_attr); + sd_file->data_attr.attr.name = "data"; + sd_file->data_attr.attr.mode = 0444; + sd_file->data_attr.read = data_read; + + rc = sysfs_create_bin_file(&sd_file->kobj, &sd_file->data_attr); + if (rc) { + kobject_put(&sd_file->kobj); + return NULL; + } + + /* + * For completeness only - users interested in entity data should listen + * for KOBJ_CHANGE instead. + */ + kobject_uevent(&sd_file->kobj, KOBJ_ADD); + + /* Don't let a slow Store Data request delay further initialization */ + async_schedule(sclp_sd_file_update_async, sd_file); + + return sd_file; +} + +/** + * sclp_sd_init() - Initialize sclp_sd support and register sysfs files + */ +static __init int sclp_sd_init(void) +{ + int rc; + + rc = sclp_register(&sclp_sd_register); + if (rc) + return rc; + + /* Create kset named "sclp_sd" located under /sys/firmware/ */ + rc = -ENOMEM; + sclp_sd_kset = kset_create_and_add("sclp_sd", NULL, firmware_kobj); + if (!sclp_sd_kset) + goto err_kset; + + rc = -EINVAL; + config_file = sclp_sd_file_create("config", SD_DI_CONFIG); + if (!config_file) + goto err_config; + + return 0; + +err_config: + kset_unregister(sclp_sd_kset); +err_kset: + sclp_unregister(&sclp_sd_register); + + return rc; +} +device_initcall(sclp_sd_init); diff --git a/drivers/s390/char/sclp_sdias.c b/drivers/s390/char/sclp_sdias.c new file mode 100644 index 000000000..8e0b69a2f --- /dev/null +++ b/drivers/s390/char/sclp_sdias.c @@ -0,0 +1,277 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCLP "store data in absolute storage" + * + * Copyright IBM Corp. 2003, 2013 + * Author(s): Michael Holzheu + */ + +#define KMSG_COMPONENT "sclp_sdias" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include + +#include "sclp_sdias.h" +#include "sclp.h" +#include "sclp_rw.h" + +#define TRACE(x...) debug_sprintf_event(sdias_dbf, 1, x) + +#define SDIAS_RETRIES 300 + +static struct debug_info *sdias_dbf; + +static struct sclp_register sclp_sdias_register = { + .send_mask = EVTYP_SDIAS_MASK, +}; + +static struct sdias_sccb sccb __attribute__((aligned(4096))); +static struct sdias_evbuf sdias_evbuf; + +static DECLARE_COMPLETION(evbuf_accepted); +static DECLARE_COMPLETION(evbuf_done); +static DEFINE_MUTEX(sdias_mutex); + +/* + * Called by SCLP base when read event data has been completed (async mode only) + */ +static void sclp_sdias_receiver_fn(struct evbuf_header *evbuf) +{ + memcpy(&sdias_evbuf, evbuf, + min_t(unsigned long, sizeof(sdias_evbuf), evbuf->length)); + complete(&evbuf_done); + TRACE("sclp_sdias_receiver_fn done\n"); +} + +/* + * Called by SCLP base when sdias event has been accepted + */ +static void sdias_callback(struct sclp_req *request, void *data) +{ + complete(&evbuf_accepted); + TRACE("callback done\n"); +} + +static int sdias_sclp_send(struct sclp_req *req) +{ + int retries; + int rc; + + for (retries = SDIAS_RETRIES; retries; retries--) { + TRACE("add request\n"); + rc = sclp_add_request(req); + if (rc) { + /* not initiated, wait some time and retry */ + set_current_state(TASK_INTERRUPTIBLE); + TRACE("add request failed: rc = %i\n",rc); + schedule_timeout(msecs_to_jiffies(500)); + continue; + } + /* initiated, wait for completion of service call */ + wait_for_completion(&evbuf_accepted); + if (req->status == SCLP_REQ_FAILED) { + TRACE("sclp request failed\n"); + continue; + } + /* if not accepted, retry */ + if (!(sccb.evbuf.hdr.flags & 0x80)) { + TRACE("sclp request failed: flags=%x\n", + sccb.evbuf.hdr.flags); + continue; + } + /* + * for the sync interface the response is in the initial sccb + */ + if (!sclp_sdias_register.receiver_fn) { + memcpy(&sdias_evbuf, &sccb.evbuf, sizeof(sdias_evbuf)); + TRACE("sync request done\n"); + return 0; + } + /* otherwise we wait for completion */ + wait_for_completion(&evbuf_done); + TRACE("request done\n"); + return 0; + } + return -EIO; +} + +/* + * Get number of blocks (4K) available in the HSA + */ +int sclp_sdias_blk_count(void) +{ + struct sclp_req request; + int rc; + + mutex_lock(&sdias_mutex); + + memset(&sccb, 0, sizeof(sccb)); + memset(&request, 0, sizeof(request)); + + sccb.hdr.length = sizeof(sccb); + sccb.evbuf.hdr.length = sizeof(struct sdias_evbuf); + sccb.evbuf.hdr.type = EVTYP_SDIAS; + sccb.evbuf.event_qual = SDIAS_EQ_SIZE; + sccb.evbuf.data_id = SDIAS_DI_FCP_DUMP; + sccb.evbuf.event_id = 4712; + sccb.evbuf.dbs = 1; + + request.sccb = &sccb; + request.command = SCLP_CMDW_WRITE_EVENT_DATA; + request.status = SCLP_REQ_FILLED; + request.callback = sdias_callback; + + rc = sdias_sclp_send(&request); + if (rc) { + pr_err("sclp_send failed for get_nr_blocks\n"); + goto out; + } + if (sccb.hdr.response_code != 0x0020) { + TRACE("send failed: %x\n", sccb.hdr.response_code); + rc = -EIO; + goto out; + } + + switch (sdias_evbuf.event_status) { + case 0: + rc = sdias_evbuf.blk_cnt; + break; + default: + pr_err("SCLP error: %x\n", sdias_evbuf.event_status); + rc = -EIO; + goto out; + } + TRACE("%i blocks\n", rc); +out: + mutex_unlock(&sdias_mutex); + return rc; +} + +/* + * Copy from HSA to absolute storage (not reentrant): + * + * @dest : Address of buffer where data should be copied + * @start_blk: Start Block (beginning with 1) + * @nr_blks : Number of 4K blocks to copy + * + * Return Value: 0 : Requested 'number' of blocks of data copied + * <0: ERROR - negative event status + */ +int sclp_sdias_copy(void *dest, int start_blk, int nr_blks) +{ + struct sclp_req request; + int rc; + + mutex_lock(&sdias_mutex); + + memset(&sccb, 0, sizeof(sccb)); + memset(&request, 0, sizeof(request)); + + sccb.hdr.length = sizeof(sccb); + sccb.evbuf.hdr.length = sizeof(struct sdias_evbuf); + sccb.evbuf.hdr.type = EVTYP_SDIAS; + sccb.evbuf.hdr.flags = 0; + sccb.evbuf.event_qual = SDIAS_EQ_STORE_DATA; + sccb.evbuf.data_id = SDIAS_DI_FCP_DUMP; + sccb.evbuf.event_id = 4712; + sccb.evbuf.asa_size = SDIAS_ASA_SIZE_64; + sccb.evbuf.event_status = 0; + sccb.evbuf.blk_cnt = nr_blks; + sccb.evbuf.asa = (unsigned long)dest; + sccb.evbuf.fbn = start_blk; + sccb.evbuf.lbn = 0; + sccb.evbuf.dbs = 1; + + request.sccb = &sccb; + request.command = SCLP_CMDW_WRITE_EVENT_DATA; + request.status = SCLP_REQ_FILLED; + request.callback = sdias_callback; + + rc = sdias_sclp_send(&request); + if (rc) { + pr_err("sclp_send failed: %x\n", rc); + goto out; + } + if (sccb.hdr.response_code != 0x0020) { + TRACE("copy failed: %x\n", sccb.hdr.response_code); + rc = -EIO; + goto out; + } + + switch (sdias_evbuf.event_status) { + case SDIAS_EVSTATE_ALL_STORED: + TRACE("all stored\n"); + break; + case SDIAS_EVSTATE_PART_STORED: + TRACE("part stored: %i\n", sdias_evbuf.blk_cnt); + break; + case SDIAS_EVSTATE_NO_DATA: + TRACE("no data\n"); + /* fall through */ + default: + pr_err("Error from SCLP while copying hsa. Event status = %x\n", + sdias_evbuf.event_status); + rc = -EIO; + } +out: + mutex_unlock(&sdias_mutex); + return rc; +} + +static int __init sclp_sdias_register_check(void) +{ + int rc; + + rc = sclp_register(&sclp_sdias_register); + if (rc) + return rc; + if (sclp_sdias_blk_count() == 0) { + sclp_unregister(&sclp_sdias_register); + return -ENODEV; + } + return 0; +} + +static int __init sclp_sdias_init_sync(void) +{ + TRACE("Try synchronous mode\n"); + sclp_sdias_register.receive_mask = 0; + sclp_sdias_register.receiver_fn = NULL; + return sclp_sdias_register_check(); +} + +static int __init sclp_sdias_init_async(void) +{ + TRACE("Try asynchronous mode\n"); + sclp_sdias_register.receive_mask = EVTYP_SDIAS_MASK; + sclp_sdias_register.receiver_fn = sclp_sdias_receiver_fn; + return sclp_sdias_register_check(); +} + +int __init sclp_sdias_init(void) +{ + if (ipl_info.type != IPL_TYPE_FCP_DUMP) + return 0; + sdias_dbf = debug_register("dump_sdias", 4, 1, 4 * sizeof(long)); + debug_register_view(sdias_dbf, &debug_sprintf_view); + debug_set_level(sdias_dbf, 6); + if (sclp_sdias_init_sync() == 0) + goto out; + if (sclp_sdias_init_async() == 0) + goto out; + TRACE("init failed\n"); + return -ENODEV; +out: + TRACE("init done\n"); + return 0; +} + +void __exit sclp_sdias_exit(void) +{ + debug_unregister(sdias_dbf); + sclp_unregister(&sclp_sdias_register); +} diff --git a/drivers/s390/char/sclp_sdias.h b/drivers/s390/char/sclp_sdias.h new file mode 100644 index 000000000..bc36cf881 --- /dev/null +++ b/drivers/s390/char/sclp_sdias.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * SCLP "store data in absolute storage" + * + * Copyright IBM Corp. 2003, 2013 + */ + +#ifndef SCLP_SDIAS_H +#define SCLP_SDIAS_H + +#include "sclp.h" + +#define SDIAS_EQ_STORE_DATA 0x0 +#define SDIAS_EQ_SIZE 0x1 +#define SDIAS_DI_FCP_DUMP 0x0 +#define SDIAS_ASA_SIZE_32 0x0 +#define SDIAS_ASA_SIZE_64 0x1 +#define SDIAS_EVSTATE_ALL_STORED 0x0 +#define SDIAS_EVSTATE_NO_DATA 0x3 +#define SDIAS_EVSTATE_PART_STORED 0x10 + +struct sdias_evbuf { + struct evbuf_header hdr; + u8 event_qual; + u8 data_id; + u64 reserved2; + u32 event_id; + u16 reserved3; + u8 asa_size; + u8 event_status; + u32 reserved4; + u32 blk_cnt; + u64 asa; + u32 reserved5; + u32 fbn; + u32 reserved6; + u32 lbn; + u16 reserved7; + u16 dbs; +} __packed; + +struct sdias_sccb { + struct sccb_header hdr; + struct sdias_evbuf evbuf; +} __packed; + +#endif /* SCLP_SDIAS_H */ diff --git a/drivers/s390/char/sclp_tty.c b/drivers/s390/char/sclp_tty.c new file mode 100644 index 000000000..5aff8b684 --- /dev/null +++ b/drivers/s390/char/sclp_tty.c @@ -0,0 +1,575 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCLP line mode terminal driver. + * + * S390 version + * Copyright IBM Corp. 1999 + * Author(s): Martin Peschke + * Martin Schwidefsky + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "ctrlchar.h" +#include "sclp.h" +#include "sclp_rw.h" +#include "sclp_tty.h" + +/* + * size of a buffer that collects single characters coming in + * via sclp_tty_put_char() + */ +#define SCLP_TTY_BUF_SIZE 512 + +/* + * There is exactly one SCLP terminal, so we can keep things simple + * and allocate all variables statically. + */ + +/* Lock to guard over changes to global variables. */ +static spinlock_t sclp_tty_lock; +/* List of free pages that can be used for console output buffering. */ +static struct list_head sclp_tty_pages; +/* List of full struct sclp_buffer structures ready for output. */ +static struct list_head sclp_tty_outqueue; +/* Counter how many buffers are emitted. */ +static int sclp_tty_buffer_count; +/* Pointer to current console buffer. */ +static struct sclp_buffer *sclp_ttybuf; +/* Timer for delayed output of console messages. */ +static struct timer_list sclp_tty_timer; + +static struct tty_port sclp_port; +static unsigned char sclp_tty_chars[SCLP_TTY_BUF_SIZE]; +static unsigned short int sclp_tty_chars_count; + +struct tty_driver *sclp_tty_driver; + +static int sclp_tty_tolower; +static int sclp_tty_columns = 80; + +#define SPACES_PER_TAB 8 +#define CASE_DELIMITER 0x6c /* to separate upper and lower case (% in EBCDIC) */ + +/* This routine is called whenever we try to open a SCLP terminal. */ +static int +sclp_tty_open(struct tty_struct *tty, struct file *filp) +{ + tty_port_tty_set(&sclp_port, tty); + tty->driver_data = NULL; + sclp_port.low_latency = 0; + return 0; +} + +/* This routine is called when the SCLP terminal is closed. */ +static void +sclp_tty_close(struct tty_struct *tty, struct file *filp) +{ + if (tty->count > 1) + return; + tty_port_tty_set(&sclp_port, NULL); +} + +/* + * This routine returns the numbers of characters the tty driver + * will accept for queuing to be written. This number is subject + * to change as output buffers get emptied, or if the output flow + * control is acted. This is not an exact number because not every + * character needs the same space in the sccb. The worst case is + * a string of newlines. Every newline creates a new message which + * needs 82 bytes. + */ +static int +sclp_tty_write_room (struct tty_struct *tty) +{ + unsigned long flags; + struct list_head *l; + int count; + + spin_lock_irqsave(&sclp_tty_lock, flags); + count = 0; + if (sclp_ttybuf != NULL) + count = sclp_buffer_space(sclp_ttybuf) / sizeof(struct msg_buf); + list_for_each(l, &sclp_tty_pages) + count += NR_EMPTY_MSG_PER_SCCB; + spin_unlock_irqrestore(&sclp_tty_lock, flags); + return count; +} + +static void +sclp_ttybuf_callback(struct sclp_buffer *buffer, int rc) +{ + unsigned long flags; + void *page; + + do { + page = sclp_unmake_buffer(buffer); + spin_lock_irqsave(&sclp_tty_lock, flags); + /* Remove buffer from outqueue */ + list_del(&buffer->list); + sclp_tty_buffer_count--; + list_add_tail((struct list_head *) page, &sclp_tty_pages); + /* Check if there is a pending buffer on the out queue. */ + buffer = NULL; + if (!list_empty(&sclp_tty_outqueue)) + buffer = list_entry(sclp_tty_outqueue.next, + struct sclp_buffer, list); + spin_unlock_irqrestore(&sclp_tty_lock, flags); + } while (buffer && sclp_emit_buffer(buffer, sclp_ttybuf_callback)); + + tty_port_tty_wakeup(&sclp_port); +} + +static inline void +__sclp_ttybuf_emit(struct sclp_buffer *buffer) +{ + unsigned long flags; + int count; + int rc; + + spin_lock_irqsave(&sclp_tty_lock, flags); + list_add_tail(&buffer->list, &sclp_tty_outqueue); + count = sclp_tty_buffer_count++; + spin_unlock_irqrestore(&sclp_tty_lock, flags); + if (count) + return; + rc = sclp_emit_buffer(buffer, sclp_ttybuf_callback); + if (rc) + sclp_ttybuf_callback(buffer, rc); +} + +/* + * When this routine is called from the timer then we flush the + * temporary write buffer. + */ +static void +sclp_tty_timeout(struct timer_list *unused) +{ + unsigned long flags; + struct sclp_buffer *buf; + + spin_lock_irqsave(&sclp_tty_lock, flags); + buf = sclp_ttybuf; + sclp_ttybuf = NULL; + spin_unlock_irqrestore(&sclp_tty_lock, flags); + + if (buf != NULL) { + __sclp_ttybuf_emit(buf); + } +} + +/* + * Write a string to the sclp tty. + */ +static int sclp_tty_write_string(const unsigned char *str, int count, int may_fail) +{ + unsigned long flags; + void *page; + int written; + int overall_written; + struct sclp_buffer *buf; + + if (count <= 0) + return 0; + overall_written = 0; + spin_lock_irqsave(&sclp_tty_lock, flags); + do { + /* Create a sclp output buffer if none exists yet */ + if (sclp_ttybuf == NULL) { + while (list_empty(&sclp_tty_pages)) { + spin_unlock_irqrestore(&sclp_tty_lock, flags); + if (may_fail) + goto out; + else + sclp_sync_wait(); + spin_lock_irqsave(&sclp_tty_lock, flags); + } + page = sclp_tty_pages.next; + list_del((struct list_head *) page); + sclp_ttybuf = sclp_make_buffer(page, sclp_tty_columns, + SPACES_PER_TAB); + } + /* try to write the string to the current output buffer */ + written = sclp_write(sclp_ttybuf, str, count); + overall_written += written; + if (written == count) + break; + /* + * Not all characters could be written to the current + * output buffer. Emit the buffer, create a new buffer + * and then output the rest of the string. + */ + buf = sclp_ttybuf; + sclp_ttybuf = NULL; + spin_unlock_irqrestore(&sclp_tty_lock, flags); + __sclp_ttybuf_emit(buf); + spin_lock_irqsave(&sclp_tty_lock, flags); + str += written; + count -= written; + } while (count > 0); + /* Setup timer to output current console buffer after 1/10 second */ + if (sclp_ttybuf && sclp_chars_in_buffer(sclp_ttybuf) && + !timer_pending(&sclp_tty_timer)) { + mod_timer(&sclp_tty_timer, jiffies + HZ / 10); + } + spin_unlock_irqrestore(&sclp_tty_lock, flags); +out: + return overall_written; +} + +/* + * This routine is called by the kernel to write a series of characters to the + * tty device. The characters may come from user space or kernel space. This + * routine will return the number of characters actually accepted for writing. + */ +static int +sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) +{ + if (sclp_tty_chars_count > 0) { + sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0); + sclp_tty_chars_count = 0; + } + return sclp_tty_write_string(buf, count, 1); +} + +/* + * This routine is called by the kernel to write a single character to the tty + * device. If the kernel uses this routine, it must call the flush_chars() + * routine (if defined) when it is done stuffing characters into the driver. + * + * Characters provided to sclp_tty_put_char() are buffered by the SCLP driver. + * If the given character is a '\n' the contents of the SCLP write buffer + * - including previous characters from sclp_tty_put_char() and strings from + * sclp_write() without final '\n' - will be written. + */ +static int +sclp_tty_put_char(struct tty_struct *tty, unsigned char ch) +{ + sclp_tty_chars[sclp_tty_chars_count++] = ch; + if (ch == '\n' || sclp_tty_chars_count >= SCLP_TTY_BUF_SIZE) { + sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0); + sclp_tty_chars_count = 0; + } + return 1; +} + +/* + * This routine is called by the kernel after it has written a series of + * characters to the tty device using put_char(). + */ +static void +sclp_tty_flush_chars(struct tty_struct *tty) +{ + if (sclp_tty_chars_count > 0) { + sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0); + sclp_tty_chars_count = 0; + } +} + +/* + * This routine returns the number of characters in the write buffer of the + * SCLP driver. The provided number includes all characters that are stored + * in the SCCB (will be written next time the SCLP is not busy) as well as + * characters in the write buffer (will not be written as long as there is a + * final line feed missing). + */ +static int +sclp_tty_chars_in_buffer(struct tty_struct *tty) +{ + unsigned long flags; + struct list_head *l; + struct sclp_buffer *t; + int count; + + spin_lock_irqsave(&sclp_tty_lock, flags); + count = 0; + if (sclp_ttybuf != NULL) + count = sclp_chars_in_buffer(sclp_ttybuf); + list_for_each(l, &sclp_tty_outqueue) { + t = list_entry(l, struct sclp_buffer, list); + count += sclp_chars_in_buffer(t); + } + spin_unlock_irqrestore(&sclp_tty_lock, flags); + return count; +} + +/* + * removes all content from buffers of low level driver + */ +static void +sclp_tty_flush_buffer(struct tty_struct *tty) +{ + if (sclp_tty_chars_count > 0) { + sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0); + sclp_tty_chars_count = 0; + } +} + +/* + * push input to tty + */ +static void +sclp_tty_input(unsigned char* buf, unsigned int count) +{ + struct tty_struct *tty = tty_port_tty_get(&sclp_port); + unsigned int cchar; + + /* + * If this tty driver is currently closed + * then throw the received input away. + */ + if (tty == NULL) + return; + cchar = ctrlchar_handle(buf, count, tty); + switch (cchar & CTRLCHAR_MASK) { + case CTRLCHAR_SYSRQ: + break; + case CTRLCHAR_CTRL: + tty_insert_flip_char(&sclp_port, cchar, TTY_NORMAL); + tty_flip_buffer_push(&sclp_port); + break; + case CTRLCHAR_NONE: + /* send (normal) input to line discipline */ + if (count < 2 || + (strncmp((const char *) buf + count - 2, "^n", 2) && + strncmp((const char *) buf + count - 2, "\252n", 2))) { + /* add the auto \n */ + tty_insert_flip_string(&sclp_port, buf, count); + tty_insert_flip_char(&sclp_port, '\n', TTY_NORMAL); + } else + tty_insert_flip_string(&sclp_port, buf, count - 2); + tty_flip_buffer_push(&sclp_port); + break; + } + tty_kref_put(tty); +} + +/* + * get a EBCDIC string in upper/lower case, + * find out characters in lower/upper case separated by a special character, + * modifiy original string, + * returns length of resulting string + */ +static int sclp_switch_cases(unsigned char *buf, int count) +{ + unsigned char *ip, *op; + int toggle; + + /* initially changing case is off */ + toggle = 0; + ip = op = buf; + while (count-- > 0) { + /* compare with special character */ + if (*ip == CASE_DELIMITER) { + /* followed by another special character? */ + if (count && ip[1] == CASE_DELIMITER) { + /* + * ... then put a single copy of the special + * character to the output string + */ + *op++ = *ip++; + count--; + } else + /* + * ... special character follower by a normal + * character toggles the case change behaviour + */ + toggle = ~toggle; + /* skip special character */ + ip++; + } else + /* not the special character */ + if (toggle) + /* but case switching is on */ + if (sclp_tty_tolower) + /* switch to uppercase */ + *op++ = _ebc_toupper[(int) *ip++]; + else + /* switch to lowercase */ + *op++ = _ebc_tolower[(int) *ip++]; + else + /* no case switching, copy the character */ + *op++ = *ip++; + } + /* return length of reformatted string. */ + return op - buf; +} + +static void sclp_get_input(struct gds_subvector *sv) +{ + unsigned char *str; + int count; + + str = (unsigned char *) (sv + 1); + count = sv->length - sizeof(*sv); + if (sclp_tty_tolower) + EBC_TOLOWER(str, count); + count = sclp_switch_cases(str, count); + /* convert EBCDIC to ASCII (modify original input in SCCB) */ + sclp_ebcasc_str(str, count); + + /* transfer input to high level driver */ + sclp_tty_input(str, count); +} + +static inline void sclp_eval_selfdeftextmsg(struct gds_subvector *sv) +{ + void *end; + + end = (void *) sv + sv->length; + for (sv = sv + 1; (void *) sv < end; sv = (void *) sv + sv->length) + if (sv->key == 0x30) + sclp_get_input(sv); +} + +static inline void sclp_eval_textcmd(struct gds_vector *v) +{ + struct gds_subvector *sv; + void *end; + + end = (void *) v + v->length; + for (sv = (struct gds_subvector *) (v + 1); + (void *) sv < end; sv = (void *) sv + sv->length) + if (sv->key == GDS_KEY_SELFDEFTEXTMSG) + sclp_eval_selfdeftextmsg(sv); + +} + +static inline void sclp_eval_cpmsu(struct gds_vector *v) +{ + void *end; + + end = (void *) v + v->length; + for (v = v + 1; (void *) v < end; v = (void *) v + v->length) + if (v->gds_id == GDS_ID_TEXTCMD) + sclp_eval_textcmd(v); +} + + +static inline void sclp_eval_mdsmu(struct gds_vector *v) +{ + v = sclp_find_gds_vector(v + 1, (void *) v + v->length, GDS_ID_CPMSU); + if (v) + sclp_eval_cpmsu(v); +} + +static void sclp_tty_receiver(struct evbuf_header *evbuf) +{ + struct gds_vector *v; + + v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length, + GDS_ID_MDSMU); + if (v) + sclp_eval_mdsmu(v); +} + +static void +sclp_tty_state_change(struct sclp_register *reg) +{ +} + +static struct sclp_register sclp_input_event = +{ + .receive_mask = EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK, + .state_change_fn = sclp_tty_state_change, + .receiver_fn = sclp_tty_receiver +}; + +static const struct tty_operations sclp_ops = { + .open = sclp_tty_open, + .close = sclp_tty_close, + .write = sclp_tty_write, + .put_char = sclp_tty_put_char, + .flush_chars = sclp_tty_flush_chars, + .write_room = sclp_tty_write_room, + .chars_in_buffer = sclp_tty_chars_in_buffer, + .flush_buffer = sclp_tty_flush_buffer, +}; + +static int __init +sclp_tty_init(void) +{ + struct tty_driver *driver; + void *page; + int i; + int rc; + + /* z/VM multiplexes the line mode output on the 32xx screen */ + if (MACHINE_IS_VM && !CONSOLE_IS_SCLP) + return 0; + if (!sclp.has_linemode) + return 0; + driver = alloc_tty_driver(1); + if (!driver) + return -ENOMEM; + + rc = sclp_rw_init(); + if (rc) { + put_tty_driver(driver); + return rc; + } + /* Allocate pages for output buffering */ + INIT_LIST_HEAD(&sclp_tty_pages); + for (i = 0; i < MAX_KMEM_PAGES; i++) { + page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (page == NULL) { + put_tty_driver(driver); + return -ENOMEM; + } + list_add_tail((struct list_head *) page, &sclp_tty_pages); + } + INIT_LIST_HEAD(&sclp_tty_outqueue); + spin_lock_init(&sclp_tty_lock); + timer_setup(&sclp_tty_timer, sclp_tty_timeout, 0); + sclp_ttybuf = NULL; + sclp_tty_buffer_count = 0; + if (MACHINE_IS_VM) { + /* + * save 4 characters for the CPU number + * written at start of each line by VM/CP + */ + sclp_tty_columns = 76; + /* case input lines to lowercase */ + sclp_tty_tolower = 1; + } + sclp_tty_chars_count = 0; + + rc = sclp_register(&sclp_input_event); + if (rc) { + put_tty_driver(driver); + return rc; + } + + tty_port_init(&sclp_port); + + driver->driver_name = "sclp_line"; + driver->name = "sclp_line"; + driver->major = TTY_MAJOR; + driver->minor_start = 64; + driver->type = TTY_DRIVER_TYPE_SYSTEM; + driver->subtype = SYSTEM_TYPE_TTY; + driver->init_termios = tty_std_termios; + driver->init_termios.c_iflag = IGNBRK | IGNPAR; + driver->init_termios.c_oflag = ONLCR; + driver->init_termios.c_lflag = ISIG | ECHO; + driver->flags = TTY_DRIVER_REAL_RAW; + tty_set_operations(driver, &sclp_ops); + tty_port_link_device(&sclp_port, driver, 0); + rc = tty_register_driver(driver); + if (rc) { + put_tty_driver(driver); + tty_port_destroy(&sclp_port); + return rc; + } + sclp_tty_driver = driver; + return 0; +} +device_initcall(sclp_tty_init); diff --git a/drivers/s390/char/sclp_tty.h b/drivers/s390/char/sclp_tty.h new file mode 100644 index 000000000..0fa2d5971 --- /dev/null +++ b/drivers/s390/char/sclp_tty.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * interface to the SCLP-read/write driver + * + * S390 version + * Copyright IBM Corp. 1999 + * Author(s): Martin Peschke + * Martin Schwidefsky + */ + +#ifndef __SCLP_TTY_H__ +#define __SCLP_TTY_H__ + +#include + +extern struct tty_driver *sclp_tty_driver; + +#endif /* __SCLP_TTY_H__ */ diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c new file mode 100644 index 000000000..3c2ed6d01 --- /dev/null +++ b/drivers/s390/char/sclp_vt220.c @@ -0,0 +1,898 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCLP VT220 terminal driver. + * + * Copyright IBM Corp. 2003, 2009 + * + * Author(s): Peter Oberparleiter + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include "sclp.h" +#include "ctrlchar.h" + +#define SCLP_VT220_MAJOR TTY_MAJOR +#define SCLP_VT220_MINOR 65 +#define SCLP_VT220_DRIVER_NAME "sclp_vt220" +#define SCLP_VT220_DEVICE_NAME "ttysclp" +#define SCLP_VT220_CONSOLE_NAME "ttysclp" +#define SCLP_VT220_CONSOLE_INDEX 0 /* console=ttysclp0 */ + +/* Representation of a single write request */ +struct sclp_vt220_request { + struct list_head list; + struct sclp_req sclp_req; + int retry_count; +}; + +/* VT220 SCCB */ +struct sclp_vt220_sccb { + struct sccb_header header; + struct evbuf_header evbuf; +}; + +#define SCLP_VT220_MAX_CHARS_PER_BUFFER (PAGE_SIZE - \ + sizeof(struct sclp_vt220_request) - \ + sizeof(struct sclp_vt220_sccb)) + +/* Structures and data needed to register tty driver */ +static struct tty_driver *sclp_vt220_driver; + +static struct tty_port sclp_vt220_port; + +/* Lock to protect internal data from concurrent access */ +static spinlock_t sclp_vt220_lock; + +/* List of empty pages to be used as write request buffers */ +static struct list_head sclp_vt220_empty; + +/* List of pending requests */ +static struct list_head sclp_vt220_outqueue; + +/* Suspend mode flag */ +static int sclp_vt220_suspended; + +/* Flag that output queue is currently running */ +static int sclp_vt220_queue_running; + +/* Timer used for delaying write requests to merge subsequent messages into + * a single buffer */ +static struct timer_list sclp_vt220_timer; + +/* Pointer to current request buffer which has been partially filled but not + * yet sent */ +static struct sclp_vt220_request *sclp_vt220_current_request; + +/* Number of characters in current request buffer */ +static int sclp_vt220_buffered_chars; + +/* Counter controlling core driver initialization. */ +static int __initdata sclp_vt220_init_count; + +/* Flag indicating that sclp_vt220_current_request should really + * have been already queued but wasn't because the SCLP was processing + * another buffer */ +static int sclp_vt220_flush_later; + +static void sclp_vt220_receiver_fn(struct evbuf_header *evbuf); +static void sclp_vt220_pm_event_fn(struct sclp_register *reg, + enum sclp_pm_event sclp_pm_event); +static int __sclp_vt220_emit(struct sclp_vt220_request *request); +static void sclp_vt220_emit_current(void); + +/* Registration structure for SCLP output event buffers */ +static struct sclp_register sclp_vt220_register = { + .send_mask = EVTYP_VT220MSG_MASK, + .pm_event_fn = sclp_vt220_pm_event_fn, +}; + +/* Registration structure for SCLP input event buffers */ +static struct sclp_register sclp_vt220_register_input = { + .receive_mask = EVTYP_VT220MSG_MASK, + .receiver_fn = sclp_vt220_receiver_fn, +}; + + +/* + * Put provided request buffer back into queue and check emit pending + * buffers if necessary. + */ +static void +sclp_vt220_process_queue(struct sclp_vt220_request *request) +{ + unsigned long flags; + void *page; + + do { + /* Put buffer back to list of empty buffers */ + page = request->sclp_req.sccb; + spin_lock_irqsave(&sclp_vt220_lock, flags); + /* Move request from outqueue to empty queue */ + list_del(&request->list); + list_add_tail((struct list_head *) page, &sclp_vt220_empty); + /* Check if there is a pending buffer on the out queue. */ + request = NULL; + if (!list_empty(&sclp_vt220_outqueue)) + request = list_entry(sclp_vt220_outqueue.next, + struct sclp_vt220_request, list); + if (!request || sclp_vt220_suspended) { + sclp_vt220_queue_running = 0; + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + break; + } + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + } while (__sclp_vt220_emit(request)); + if (request == NULL && sclp_vt220_flush_later) + sclp_vt220_emit_current(); + tty_port_tty_wakeup(&sclp_vt220_port); +} + +#define SCLP_BUFFER_MAX_RETRY 1 + +/* + * Callback through which the result of a write request is reported by the + * SCLP. + */ +static void +sclp_vt220_callback(struct sclp_req *request, void *data) +{ + struct sclp_vt220_request *vt220_request; + struct sclp_vt220_sccb *sccb; + + vt220_request = (struct sclp_vt220_request *) data; + if (request->status == SCLP_REQ_FAILED) { + sclp_vt220_process_queue(vt220_request); + return; + } + sccb = (struct sclp_vt220_sccb *) vt220_request->sclp_req.sccb; + + /* Check SCLP response code and choose suitable action */ + switch (sccb->header.response_code) { + case 0x0020 : + break; + + case 0x05f0: /* Target resource in improper state */ + break; + + case 0x0340: /* Contained SCLP equipment check */ + if (++vt220_request->retry_count > SCLP_BUFFER_MAX_RETRY) + break; + /* Remove processed buffers and requeue rest */ + if (sclp_remove_processed((struct sccb_header *) sccb) > 0) { + /* Not all buffers were processed */ + sccb->header.response_code = 0x0000; + vt220_request->sclp_req.status = SCLP_REQ_FILLED; + if (sclp_add_request(request) == 0) + return; + } + break; + + case 0x0040: /* SCLP equipment check */ + if (++vt220_request->retry_count > SCLP_BUFFER_MAX_RETRY) + break; + sccb->header.response_code = 0x0000; + vt220_request->sclp_req.status = SCLP_REQ_FILLED; + if (sclp_add_request(request) == 0) + return; + break; + + default: + break; + } + sclp_vt220_process_queue(vt220_request); +} + +/* + * Emit vt220 request buffer to SCLP. Return zero on success, non-zero + * otherwise. + */ +static int +__sclp_vt220_emit(struct sclp_vt220_request *request) +{ + request->sclp_req.command = SCLP_CMDW_WRITE_EVENT_DATA; + request->sclp_req.status = SCLP_REQ_FILLED; + request->sclp_req.callback = sclp_vt220_callback; + request->sclp_req.callback_data = (void *) request; + + return sclp_add_request(&request->sclp_req); +} + +/* + * Queue and emit current request. + */ +static void +sclp_vt220_emit_current(void) +{ + unsigned long flags; + struct sclp_vt220_request *request; + struct sclp_vt220_sccb *sccb; + + spin_lock_irqsave(&sclp_vt220_lock, flags); + if (sclp_vt220_current_request) { + sccb = (struct sclp_vt220_sccb *) + sclp_vt220_current_request->sclp_req.sccb; + /* Only emit buffers with content */ + if (sccb->header.length != sizeof(struct sclp_vt220_sccb)) { + list_add_tail(&sclp_vt220_current_request->list, + &sclp_vt220_outqueue); + sclp_vt220_current_request = NULL; + if (timer_pending(&sclp_vt220_timer)) + del_timer(&sclp_vt220_timer); + } + sclp_vt220_flush_later = 0; + } + if (sclp_vt220_queue_running || sclp_vt220_suspended) + goto out_unlock; + if (list_empty(&sclp_vt220_outqueue)) + goto out_unlock; + request = list_first_entry(&sclp_vt220_outqueue, + struct sclp_vt220_request, list); + sclp_vt220_queue_running = 1; + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + + if (__sclp_vt220_emit(request)) + sclp_vt220_process_queue(request); + return; +out_unlock: + spin_unlock_irqrestore(&sclp_vt220_lock, flags); +} + +#define SCLP_NORMAL_WRITE 0x00 + +/* + * Helper function to initialize a page with the sclp request structure. + */ +static struct sclp_vt220_request * +sclp_vt220_initialize_page(void *page) +{ + struct sclp_vt220_request *request; + struct sclp_vt220_sccb *sccb; + + /* Place request structure at end of page */ + request = ((struct sclp_vt220_request *) + ((addr_t) page + PAGE_SIZE)) - 1; + request->retry_count = 0; + request->sclp_req.sccb = page; + /* SCCB goes at start of page */ + sccb = (struct sclp_vt220_sccb *) page; + memset((void *) sccb, 0, sizeof(struct sclp_vt220_sccb)); + sccb->header.length = sizeof(struct sclp_vt220_sccb); + sccb->header.function_code = SCLP_NORMAL_WRITE; + sccb->header.response_code = 0x0000; + sccb->evbuf.type = EVTYP_VT220MSG; + sccb->evbuf.length = sizeof(struct evbuf_header); + + return request; +} + +static inline unsigned int +sclp_vt220_space_left(struct sclp_vt220_request *request) +{ + struct sclp_vt220_sccb *sccb; + sccb = (struct sclp_vt220_sccb *) request->sclp_req.sccb; + return PAGE_SIZE - sizeof(struct sclp_vt220_request) - + sccb->header.length; +} + +static inline unsigned int +sclp_vt220_chars_stored(struct sclp_vt220_request *request) +{ + struct sclp_vt220_sccb *sccb; + sccb = (struct sclp_vt220_sccb *) request->sclp_req.sccb; + return sccb->evbuf.length - sizeof(struct evbuf_header); +} + +/* + * Add msg to buffer associated with request. Return the number of characters + * added. + */ +static int +sclp_vt220_add_msg(struct sclp_vt220_request *request, + const unsigned char *msg, int count, int convertlf) +{ + struct sclp_vt220_sccb *sccb; + void *buffer; + unsigned char c; + int from; + int to; + + if (count > sclp_vt220_space_left(request)) + count = sclp_vt220_space_left(request); + if (count <= 0) + return 0; + + sccb = (struct sclp_vt220_sccb *) request->sclp_req.sccb; + buffer = (void *) ((addr_t) sccb + sccb->header.length); + + if (convertlf) { + /* Perform Linefeed conversion (0x0a -> 0x0a 0x0d)*/ + for (from=0, to=0; + (from < count) && (to < sclp_vt220_space_left(request)); + from++) { + /* Retrieve character */ + c = msg[from]; + /* Perform conversion */ + if (c == 0x0a) { + if (to + 1 < sclp_vt220_space_left(request)) { + ((unsigned char *) buffer)[to++] = c; + ((unsigned char *) buffer)[to++] = 0x0d; + } else + break; + + } else + ((unsigned char *) buffer)[to++] = c; + } + sccb->header.length += to; + sccb->evbuf.length += to; + return from; + } else { + memcpy(buffer, (const void *) msg, count); + sccb->header.length += count; + sccb->evbuf.length += count; + return count; + } +} + +/* + * Emit buffer after having waited long enough for more data to arrive. + */ +static void +sclp_vt220_timeout(struct timer_list *unused) +{ + sclp_vt220_emit_current(); +} + +#define BUFFER_MAX_DELAY HZ/20 + +/* + * Drop oldest console buffer if sclp_con_drop is set + */ +static int +sclp_vt220_drop_buffer(void) +{ + struct list_head *list; + struct sclp_vt220_request *request; + void *page; + + if (!sclp_console_drop) + return 0; + list = sclp_vt220_outqueue.next; + if (sclp_vt220_queue_running) + /* The first element is in I/O */ + list = list->next; + if (list == &sclp_vt220_outqueue) + return 0; + list_del(list); + request = list_entry(list, struct sclp_vt220_request, list); + page = request->sclp_req.sccb; + list_add_tail((struct list_head *) page, &sclp_vt220_empty); + return 1; +} + +/* + * Internal implementation of the write function. Write COUNT bytes of data + * from memory at BUF + * to the SCLP interface. In case that the data does not fit into the current + * write buffer, emit the current one and allocate a new one. If there are no + * more empty buffers available, wait until one gets emptied. If DO_SCHEDULE + * is non-zero, the buffer will be scheduled for emitting after a timeout - + * otherwise the user has to explicitly call the flush function. + * A non-zero CONVERTLF parameter indicates that 0x0a characters in the message + * buffer should be converted to 0x0a 0x0d. After completion, return the number + * of bytes written. + */ +static int +__sclp_vt220_write(const unsigned char *buf, int count, int do_schedule, + int convertlf, int may_fail) +{ + unsigned long flags; + void *page; + int written; + int overall_written; + + if (count <= 0) + return 0; + overall_written = 0; + spin_lock_irqsave(&sclp_vt220_lock, flags); + do { + /* Create an sclp output buffer if none exists yet */ + if (sclp_vt220_current_request == NULL) { + if (list_empty(&sclp_vt220_empty)) + sclp_console_full++; + while (list_empty(&sclp_vt220_empty)) { + if (may_fail || sclp_vt220_suspended) + goto out; + if (sclp_vt220_drop_buffer()) + break; + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + + sclp_sync_wait(); + spin_lock_irqsave(&sclp_vt220_lock, flags); + } + page = (void *) sclp_vt220_empty.next; + list_del((struct list_head *) page); + sclp_vt220_current_request = + sclp_vt220_initialize_page(page); + } + /* Try to write the string to the current request buffer */ + written = sclp_vt220_add_msg(sclp_vt220_current_request, + buf, count, convertlf); + overall_written += written; + if (written == count) + break; + /* + * Not all characters could be written to the current + * output buffer. Emit the buffer, create a new buffer + * and then output the rest of the string. + */ + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + sclp_vt220_emit_current(); + spin_lock_irqsave(&sclp_vt220_lock, flags); + buf += written; + count -= written; + } while (count > 0); + /* Setup timer to output current console buffer after some time */ + if (sclp_vt220_current_request != NULL && + !timer_pending(&sclp_vt220_timer) && do_schedule) { + sclp_vt220_timer.expires = jiffies + BUFFER_MAX_DELAY; + add_timer(&sclp_vt220_timer); + } +out: + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + return overall_written; +} + +/* + * This routine is called by the kernel to write a series of + * characters to the tty device. The characters may come from + * user space or kernel space. This routine will return the + * number of characters actually accepted for writing. + */ +static int +sclp_vt220_write(struct tty_struct *tty, const unsigned char *buf, int count) +{ + return __sclp_vt220_write(buf, count, 1, 0, 1); +} + +#define SCLP_VT220_SESSION_ENDED 0x01 +#define SCLP_VT220_SESSION_STARTED 0x80 +#define SCLP_VT220_SESSION_DATA 0x00 + +#ifdef CONFIG_MAGIC_SYSRQ + +static int sysrq_pressed; +static struct sysrq_work sysrq; + +static void sclp_vt220_reset_session(void) +{ + sysrq_pressed = 0; +} + +static void sclp_vt220_handle_input(const char *buffer, unsigned int count) +{ + int i; + + for (i = 0; i < count; i++) { + /* Handle magic sys request */ + if (buffer[i] == ('O' ^ 0100)) { /* CTRL-O */ + /* + * If pressed again, reset sysrq_pressed + * and flip CTRL-O character + */ + sysrq_pressed = !sysrq_pressed; + if (sysrq_pressed) + continue; + } else if (sysrq_pressed) { + sysrq.key = buffer[i]; + schedule_sysrq_work(&sysrq); + sysrq_pressed = 0; + continue; + } + tty_insert_flip_char(&sclp_vt220_port, buffer[i], 0); + } +} + +#else + +static void sclp_vt220_reset_session(void) +{ +} + +static void sclp_vt220_handle_input(const char *buffer, unsigned int count) +{ + tty_insert_flip_string(&sclp_vt220_port, buffer, count); +} + +#endif + +/* + * Called by the SCLP to report incoming event buffers. + */ +static void +sclp_vt220_receiver_fn(struct evbuf_header *evbuf) +{ + char *buffer; + unsigned int count; + + buffer = (char *) ((addr_t) evbuf + sizeof(struct evbuf_header)); + count = evbuf->length - sizeof(struct evbuf_header); + + switch (*buffer) { + case SCLP_VT220_SESSION_ENDED: + case SCLP_VT220_SESSION_STARTED: + sclp_vt220_reset_session(); + break; + case SCLP_VT220_SESSION_DATA: + /* Send input to line discipline */ + buffer++; + count--; + sclp_vt220_handle_input(buffer, count); + tty_flip_buffer_push(&sclp_vt220_port); + break; + } +} + +/* + * This routine is called when a particular tty device is opened. + */ +static int +sclp_vt220_open(struct tty_struct *tty, struct file *filp) +{ + if (tty->count == 1) { + tty_port_tty_set(&sclp_vt220_port, tty); + sclp_vt220_port.low_latency = 0; + if (!tty->winsize.ws_row && !tty->winsize.ws_col) { + tty->winsize.ws_row = 24; + tty->winsize.ws_col = 80; + } + } + return 0; +} + +/* + * This routine is called when a particular tty device is closed. + */ +static void +sclp_vt220_close(struct tty_struct *tty, struct file *filp) +{ + if (tty->count == 1) + tty_port_tty_set(&sclp_vt220_port, NULL); +} + +/* + * This routine is called by the kernel to write a single + * character to the tty device. If the kernel uses this routine, + * it must call the flush_chars() routine (if defined) when it is + * done stuffing characters into the driver. + */ +static int +sclp_vt220_put_char(struct tty_struct *tty, unsigned char ch) +{ + return __sclp_vt220_write(&ch, 1, 0, 0, 1); +} + +/* + * This routine is called by the kernel after it has written a + * series of characters to the tty device using put_char(). + */ +static void +sclp_vt220_flush_chars(struct tty_struct *tty) +{ + if (!sclp_vt220_queue_running) + sclp_vt220_emit_current(); + else + sclp_vt220_flush_later = 1; +} + +/* + * This routine returns the numbers of characters the tty driver + * will accept for queuing to be written. This number is subject + * to change as output buffers get emptied, or if the output flow + * control is acted. + */ +static int +sclp_vt220_write_room(struct tty_struct *tty) +{ + unsigned long flags; + struct list_head *l; + int count; + + spin_lock_irqsave(&sclp_vt220_lock, flags); + count = 0; + if (sclp_vt220_current_request != NULL) + count = sclp_vt220_space_left(sclp_vt220_current_request); + list_for_each(l, &sclp_vt220_empty) + count += SCLP_VT220_MAX_CHARS_PER_BUFFER; + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + return count; +} + +/* + * Return number of buffered chars. + */ +static int +sclp_vt220_chars_in_buffer(struct tty_struct *tty) +{ + unsigned long flags; + struct list_head *l; + struct sclp_vt220_request *r; + int count; + + spin_lock_irqsave(&sclp_vt220_lock, flags); + count = 0; + if (sclp_vt220_current_request != NULL) + count = sclp_vt220_chars_stored(sclp_vt220_current_request); + list_for_each(l, &sclp_vt220_outqueue) { + r = list_entry(l, struct sclp_vt220_request, list); + count += sclp_vt220_chars_stored(r); + } + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + return count; +} + +/* + * Pass on all buffers to the hardware. Return only when there are no more + * buffers pending. + */ +static void +sclp_vt220_flush_buffer(struct tty_struct *tty) +{ + sclp_vt220_emit_current(); +} + +/* Release allocated pages. */ +static void __init __sclp_vt220_free_pages(void) +{ + struct list_head *page, *p; + + list_for_each_safe(page, p, &sclp_vt220_empty) { + list_del(page); + free_page((unsigned long) page); + } +} + +/* Release memory and unregister from sclp core. Controlled by init counting - + * only the last invoker will actually perform these actions. */ +static void __init __sclp_vt220_cleanup(void) +{ + sclp_vt220_init_count--; + if (sclp_vt220_init_count != 0) + return; + sclp_unregister(&sclp_vt220_register); + __sclp_vt220_free_pages(); + tty_port_destroy(&sclp_vt220_port); +} + +/* Allocate buffer pages and register with sclp core. Controlled by init + * counting - only the first invoker will actually perform these actions. */ +static int __init __sclp_vt220_init(int num_pages) +{ + void *page; + int i; + int rc; + + sclp_vt220_init_count++; + if (sclp_vt220_init_count != 1) + return 0; + spin_lock_init(&sclp_vt220_lock); + INIT_LIST_HEAD(&sclp_vt220_empty); + INIT_LIST_HEAD(&sclp_vt220_outqueue); + timer_setup(&sclp_vt220_timer, sclp_vt220_timeout, 0); + tty_port_init(&sclp_vt220_port); + sclp_vt220_current_request = NULL; + sclp_vt220_buffered_chars = 0; + sclp_vt220_flush_later = 0; + + /* Allocate pages for output buffering */ + rc = -ENOMEM; + for (i = 0; i < num_pages; i++) { + page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!page) + goto out; + list_add_tail(page, &sclp_vt220_empty); + } + rc = sclp_register(&sclp_vt220_register); +out: + if (rc) { + __sclp_vt220_free_pages(); + sclp_vt220_init_count--; + tty_port_destroy(&sclp_vt220_port); + } + return rc; +} + +static const struct tty_operations sclp_vt220_ops = { + .open = sclp_vt220_open, + .close = sclp_vt220_close, + .write = sclp_vt220_write, + .put_char = sclp_vt220_put_char, + .flush_chars = sclp_vt220_flush_chars, + .write_room = sclp_vt220_write_room, + .chars_in_buffer = sclp_vt220_chars_in_buffer, + .flush_buffer = sclp_vt220_flush_buffer, +}; + +/* + * Register driver with SCLP and Linux and initialize internal tty structures. + */ +static int __init sclp_vt220_tty_init(void) +{ + struct tty_driver *driver; + int rc; + + /* Note: we're not testing for CONSOLE_IS_SCLP here to preserve + * symmetry between VM and LPAR systems regarding ttyS1. */ + driver = alloc_tty_driver(1); + if (!driver) + return -ENOMEM; + rc = __sclp_vt220_init(MAX_KMEM_PAGES); + if (rc) + goto out_driver; + + driver->driver_name = SCLP_VT220_DRIVER_NAME; + driver->name = SCLP_VT220_DEVICE_NAME; + driver->major = SCLP_VT220_MAJOR; + driver->minor_start = SCLP_VT220_MINOR; + driver->type = TTY_DRIVER_TYPE_SYSTEM; + driver->subtype = SYSTEM_TYPE_TTY; + driver->init_termios = tty_std_termios; + driver->flags = TTY_DRIVER_REAL_RAW; + tty_set_operations(driver, &sclp_vt220_ops); + tty_port_link_device(&sclp_vt220_port, driver, 0); + + rc = tty_register_driver(driver); + if (rc) + goto out_init; + rc = sclp_register(&sclp_vt220_register_input); + if (rc) + goto out_reg; + sclp_vt220_driver = driver; + return 0; + +out_reg: + tty_unregister_driver(driver); +out_init: + __sclp_vt220_cleanup(); +out_driver: + put_tty_driver(driver); + return rc; +} +__initcall(sclp_vt220_tty_init); + +static void __sclp_vt220_flush_buffer(void) +{ + unsigned long flags; + + sclp_vt220_emit_current(); + spin_lock_irqsave(&sclp_vt220_lock, flags); + if (timer_pending(&sclp_vt220_timer)) + del_timer(&sclp_vt220_timer); + while (sclp_vt220_queue_running) { + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + sclp_sync_wait(); + spin_lock_irqsave(&sclp_vt220_lock, flags); + } + spin_unlock_irqrestore(&sclp_vt220_lock, flags); +} + +/* + * Resume console: If there are cached messages, emit them. + */ +static void sclp_vt220_resume(void) +{ + unsigned long flags; + + spin_lock_irqsave(&sclp_vt220_lock, flags); + sclp_vt220_suspended = 0; + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + sclp_vt220_emit_current(); +} + +/* + * Suspend console: Set suspend flag and flush console + */ +static void sclp_vt220_suspend(void) +{ + unsigned long flags; + + spin_lock_irqsave(&sclp_vt220_lock, flags); + sclp_vt220_suspended = 1; + spin_unlock_irqrestore(&sclp_vt220_lock, flags); + __sclp_vt220_flush_buffer(); +} + +static void sclp_vt220_pm_event_fn(struct sclp_register *reg, + enum sclp_pm_event sclp_pm_event) +{ + switch (sclp_pm_event) { + case SCLP_PM_EVENT_FREEZE: + sclp_vt220_suspend(); + break; + case SCLP_PM_EVENT_RESTORE: + case SCLP_PM_EVENT_THAW: + sclp_vt220_resume(); + break; + } +} + +#ifdef CONFIG_SCLP_VT220_CONSOLE + +static void +sclp_vt220_con_write(struct console *con, const char *buf, unsigned int count) +{ + __sclp_vt220_write((const unsigned char *) buf, count, 1, 1, 0); +} + +static struct tty_driver * +sclp_vt220_con_device(struct console *c, int *index) +{ + *index = 0; + return sclp_vt220_driver; +} + +static int +sclp_vt220_notify(struct notifier_block *self, + unsigned long event, void *data) +{ + __sclp_vt220_flush_buffer(); + return NOTIFY_OK; +} + +static struct notifier_block on_panic_nb = { + .notifier_call = sclp_vt220_notify, + .priority = 1, +}; + +static struct notifier_block on_reboot_nb = { + .notifier_call = sclp_vt220_notify, + .priority = 1, +}; + +/* Structure needed to register with printk */ +static struct console sclp_vt220_console = +{ + .name = SCLP_VT220_CONSOLE_NAME, + .write = sclp_vt220_con_write, + .device = sclp_vt220_con_device, + .flags = CON_PRINTBUFFER, + .index = SCLP_VT220_CONSOLE_INDEX +}; + +static int __init +sclp_vt220_con_init(void) +{ + int rc; + + rc = __sclp_vt220_init(sclp_console_pages); + if (rc) + return rc; + /* Attach linux console */ + atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); + register_reboot_notifier(&on_reboot_nb); + register_console(&sclp_vt220_console); + return 0; +} + +console_initcall(sclp_vt220_con_init); +#endif /* CONFIG_SCLP_VT220_CONSOLE */ + diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h new file mode 100644 index 000000000..8bec5f9ea --- /dev/null +++ b/drivers/s390/char/tape.h @@ -0,0 +1,371 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * tape device driver for 3480/3490E/3590 tapes. + * + * S390 and zSeries version + * Copyright IBM Corp. 2001, 2009 + * Author(s): Carsten Otte + * Tuan Ngo-Anh + * Martin Schwidefsky + * Stefan Bader + */ + +#ifndef _TAPE_H +#define _TAPE_H + +#include +#include +#include +#include +#include +#include +#include +#include + +struct gendisk; + +/* + * Define DBF_LIKE_HELL for lots of messages in the debug feature. + */ +#define DBF_LIKE_HELL +#ifdef DBF_LIKE_HELL +#define DBF_LH(level, str, ...) \ +do { \ + debug_sprintf_event(TAPE_DBF_AREA, level, str, ## __VA_ARGS__); \ +} while (0) +#else +#define DBF_LH(level, str, ...) do {} while(0) +#endif + +/* + * macros s390 debug feature (dbf) + */ +#define DBF_EVENT(d_level, d_str...) \ +do { \ + debug_sprintf_event(TAPE_DBF_AREA, d_level, d_str); \ +} while (0) + +#define DBF_EXCEPTION(d_level, d_str...) \ +do { \ + debug_sprintf_exception(TAPE_DBF_AREA, d_level, d_str); \ +} while (0) + +#define TAPE_VERSION_MAJOR 2 +#define TAPE_VERSION_MINOR 0 +#define TAPE_MAGIC "tape" + +#define TAPE_MINORS_PER_DEV 2 /* two minors per device */ +#define TAPEBLOCK_HSEC_SIZE 2048 +#define TAPEBLOCK_HSEC_S2B 2 +#define TAPEBLOCK_RETRIES 5 + +enum tape_medium_state { + MS_UNKNOWN, + MS_LOADED, + MS_UNLOADED, + MS_SIZE +}; + +enum tape_state { + TS_UNUSED=0, + TS_IN_USE, + TS_BLKUSE, + TS_INIT, + TS_NOT_OPER, + TS_SIZE +}; + +enum tape_op { + TO_BLOCK, /* Block read */ + TO_BSB, /* Backward space block */ + TO_BSF, /* Backward space filemark */ + TO_DSE, /* Data security erase */ + TO_FSB, /* Forward space block */ + TO_FSF, /* Forward space filemark */ + TO_LBL, /* Locate block label */ + TO_NOP, /* No operation */ + TO_RBA, /* Read backward */ + TO_RBI, /* Read block information */ + TO_RFO, /* Read forward */ + TO_REW, /* Rewind tape */ + TO_RUN, /* Rewind and unload tape */ + TO_WRI, /* Write block */ + TO_WTM, /* Write tape mark */ + TO_MSEN, /* Medium sense */ + TO_LOAD, /* Load tape */ + TO_READ_CONFIG, /* Read configuration data */ + TO_READ_ATTMSG, /* Read attention message */ + TO_DIS, /* Tape display */ + TO_ASSIGN, /* Assign tape to channel path */ + TO_UNASSIGN, /* Unassign tape from channel path */ + TO_CRYPT_ON, /* Enable encrpytion */ + TO_CRYPT_OFF, /* Disable encrpytion */ + TO_KEKL_SET, /* Set KEK label */ + TO_KEKL_QUERY, /* Query KEK label */ + TO_RDC, /* Read device characteristics */ + TO_SIZE, /* #entries in tape_op_t */ +}; + +/* Forward declaration */ +struct tape_device; + +/* tape_request->status can be: */ +enum tape_request_status { + TAPE_REQUEST_INIT, /* request is ready to be processed */ + TAPE_REQUEST_QUEUED, /* request is queued to be processed */ + TAPE_REQUEST_IN_IO, /* request is currently in IO */ + TAPE_REQUEST_DONE, /* request is completed. */ + TAPE_REQUEST_CANCEL, /* request should be canceled. */ + TAPE_REQUEST_LONG_BUSY, /* request has to be restarted after long busy */ +}; + +/* Tape CCW request */ +struct tape_request { + struct list_head list; /* list head for request queueing. */ + struct tape_device *device; /* tape device of this request */ + struct ccw1 *cpaddr; /* address of the channel program. */ + void *cpdata; /* pointer to ccw data. */ + enum tape_request_status status;/* status of this request */ + int options; /* options for execution. */ + int retries; /* retry counter for error recovery. */ + int rescnt; /* residual count from devstat. */ + struct timer_list timer; /* timer for std_assign_timeout(). */ + + /* Callback for delivering final status. */ + void (*callback)(struct tape_request *, void *); + void *callback_data; + + enum tape_op op; + int rc; +}; + +/* Function type for magnetic tape commands */ +typedef int (*tape_mtop_fn)(struct tape_device *, int); + +/* Size of the array containing the mtops for a discipline */ +#define TAPE_NR_MTOPS (MTMKPART+1) + +/* Tape Discipline */ +struct tape_discipline { + struct module *owner; + int (*setup_device)(struct tape_device *); + void (*cleanup_device)(struct tape_device *); + int (*irq)(struct tape_device *, struct tape_request *, struct irb *); + struct tape_request *(*read_block)(struct tape_device *, size_t); + struct tape_request *(*write_block)(struct tape_device *, size_t); + void (*process_eov)(struct tape_device*); + /* ioctl function for additional ioctls. */ + int (*ioctl_fn)(struct tape_device *, unsigned int, unsigned long); + /* Array of tape commands with TAPE_NR_MTOPS entries */ + tape_mtop_fn *mtop_array; +}; + +/* + * The discipline irq function either returns an error code (<0) which + * means that the request has failed with an error or one of the following: + */ +#define TAPE_IO_SUCCESS 0 /* request successful */ +#define TAPE_IO_PENDING 1 /* request still running */ +#define TAPE_IO_RETRY 2 /* retry to current request */ +#define TAPE_IO_STOP 3 /* stop the running request */ +#define TAPE_IO_LONG_BUSY 4 /* delay the running request */ + +/* Char Frontend Data */ +struct tape_char_data { + struct idal_buffer *idal_buf; /* idal buffer for user char data */ + int block_size; /* of size block_size. */ +}; + +/* Tape Info */ +struct tape_device { + /* entry in tape_device_list */ + struct list_head node; + + int cdev_id; + struct ccw_device * cdev; + struct tape_class_device * nt; + struct tape_class_device * rt; + + /* Device mutex to serialize tape commands. */ + struct mutex mutex; + + /* Device discipline information. */ + struct tape_discipline * discipline; + void * discdata; + + /* Generic status flags */ + long tape_generic_status; + + /* Device state information. */ + wait_queue_head_t state_change_wq; + enum tape_state tape_state; + enum tape_medium_state medium_state; + unsigned char * modeset_byte; + + /* Reference count. */ + atomic_t ref_count; + + /* Request queue. */ + struct list_head req_queue; + + /* Request wait queue. */ + wait_queue_head_t wait_queue; + + /* Each tape device has (currently) two minor numbers. */ + int first_minor; + + /* Number of tapemarks required for correct termination. */ + int required_tapemarks; + + /* Block ID of the BOF */ + unsigned int bof; + + /* Character device frontend data */ + struct tape_char_data char_data; + + /* Function to start or stop the next request later. */ + struct delayed_work tape_dnr; + + /* Timer for long busy */ + struct timer_list lb_timeout; + +}; + +/* Externals from tape_core.c */ +extern struct tape_request *tape_alloc_request(int cplength, int datasize); +extern void tape_free_request(struct tape_request *); +extern int tape_do_io(struct tape_device *, struct tape_request *); +extern int tape_do_io_async(struct tape_device *, struct tape_request *); +extern int tape_do_io_interruptible(struct tape_device *, struct tape_request *); +extern int tape_cancel_io(struct tape_device *, struct tape_request *); +void tape_hotplug_event(struct tape_device *, int major, int action); + +static inline int +tape_do_io_free(struct tape_device *device, struct tape_request *request) +{ + int rc; + + rc = tape_do_io(device, request); + tape_free_request(request); + return rc; +} + +static inline void +tape_do_io_async_free(struct tape_device *device, struct tape_request *request) +{ + request->callback = (void *) tape_free_request; + request->callback_data = NULL; + tape_do_io_async(device, request); +} + +extern int tape_oper_handler(int irq, int status); +extern void tape_noper_handler(int irq, int status); +extern int tape_open(struct tape_device *); +extern int tape_release(struct tape_device *); +extern int tape_mtop(struct tape_device *, int, int); +extern void tape_state_set(struct tape_device *, enum tape_state); + +extern int tape_generic_online(struct tape_device *, struct tape_discipline *); +extern int tape_generic_offline(struct ccw_device *); +extern int tape_generic_pm_suspend(struct ccw_device *); + +/* Externals from tape_devmap.c */ +extern int tape_generic_probe(struct ccw_device *); +extern void tape_generic_remove(struct ccw_device *); + +extern struct tape_device *tape_find_device(int devindex); +extern struct tape_device *tape_get_device(struct tape_device *); +extern void tape_put_device(struct tape_device *); + +/* Externals from tape_char.c */ +extern int tapechar_init(void); +extern void tapechar_exit(void); +extern int tapechar_setup_device(struct tape_device *); +extern void tapechar_cleanup_device(struct tape_device *); + +/* tape initialisation functions */ +#ifdef CONFIG_PROC_FS +extern void tape_proc_init (void); +extern void tape_proc_cleanup (void); +#else +static inline void tape_proc_init (void) {;} +static inline void tape_proc_cleanup (void) {;} +#endif + +/* a function for dumping device sense info */ +extern void tape_dump_sense_dbf(struct tape_device *, struct tape_request *, + struct irb *); + +/* functions for handling the status of a device */ +extern void tape_med_state_set(struct tape_device *, enum tape_medium_state); + +/* The debug area */ +extern debug_info_t *TAPE_DBF_AREA; + +/* functions for building ccws */ +static inline struct ccw1 * +tape_ccw_cc(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda) +{ + ccw->cmd_code = cmd_code; + ccw->flags = CCW_FLAG_CC; + ccw->count = memsize; + ccw->cda = (__u32)(addr_t) cda; + return ccw + 1; +} + +static inline struct ccw1 * +tape_ccw_end(struct ccw1 *ccw, __u8 cmd_code, __u16 memsize, void *cda) +{ + ccw->cmd_code = cmd_code; + ccw->flags = 0; + ccw->count = memsize; + ccw->cda = (__u32)(addr_t) cda; + return ccw + 1; +} + +static inline struct ccw1 * +tape_ccw_cmd(struct ccw1 *ccw, __u8 cmd_code) +{ + ccw->cmd_code = cmd_code; + ccw->flags = 0; + ccw->count = 0; + ccw->cda = (__u32)(addr_t) &ccw->cmd_code; + return ccw + 1; +} + +static inline struct ccw1 * +tape_ccw_repeat(struct ccw1 *ccw, __u8 cmd_code, int count) +{ + while (count-- > 0) { + ccw->cmd_code = cmd_code; + ccw->flags = CCW_FLAG_CC; + ccw->count = 0; + ccw->cda = (__u32)(addr_t) &ccw->cmd_code; + ccw++; + } + return ccw; +} + +static inline struct ccw1 * +tape_ccw_cc_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal) +{ + ccw->cmd_code = cmd_code; + ccw->flags = CCW_FLAG_CC; + idal_buffer_set_cda(idal, ccw); + return ccw++; +} + +static inline struct ccw1 * +tape_ccw_end_idal(struct ccw1 *ccw, __u8 cmd_code, struct idal_buffer *idal) +{ + ccw->cmd_code = cmd_code; + ccw->flags = 0; + idal_buffer_set_cda(idal, ccw); + return ccw++; +} + +/* Global vars */ +extern const char *tape_state_verbose[]; +extern const char *tape_op_verbose[]; + +#endif /* for ifdef tape.h */ diff --git a/drivers/s390/char/tape_34xx.c b/drivers/s390/char/tape_34xx.c new file mode 100644 index 000000000..6d73ee3f8 --- /dev/null +++ b/drivers/s390/char/tape_34xx.c @@ -0,0 +1,1233 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * tape device discipline for 3480/3490 tapes. + * + * Copyright IBM Corp. 2001, 2009 + * Author(s): Carsten Otte + * Tuan Ngo-Anh + * Martin Schwidefsky + */ + +#define KMSG_COMPONENT "tape_34xx" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include + +#define TAPE_DBF_AREA tape_34xx_dbf + +#include "tape.h" +#include "tape_std.h" + +/* + * Pointer to debug area. + */ +debug_info_t *TAPE_DBF_AREA = NULL; +EXPORT_SYMBOL(TAPE_DBF_AREA); + +#define TAPE34XX_FMT_3480 0 +#define TAPE34XX_FMT_3480_2_XF 1 +#define TAPE34XX_FMT_3480_XF 2 + +struct tape_34xx_block_id { + unsigned int wrap : 1; + unsigned int segment : 7; + unsigned int format : 2; + unsigned int block : 22; +}; + +/* + * A list of block ID's is used to faster seek blocks. + */ +struct tape_34xx_sbid { + struct list_head list; + struct tape_34xx_block_id bid; +}; + +static void tape_34xx_delete_sbid_from(struct tape_device *, int); + +/* + * Medium sense for 34xx tapes. There is no 'real' medium sense call. + * So we just do a normal sense. + */ +static void __tape_34xx_medium_sense(struct tape_request *request) +{ + struct tape_device *device = request->device; + unsigned char *sense; + + if (request->rc == 0) { + sense = request->cpdata; + + /* + * This isn't quite correct. But since INTERVENTION_REQUIRED + * means that the drive is 'neither ready nor on-line' it is + * only slightly inaccurate to say there is no tape loaded if + * the drive isn't online... + */ + if (sense[0] & SENSE_INTERVENTION_REQUIRED) + tape_med_state_set(device, MS_UNLOADED); + else + tape_med_state_set(device, MS_LOADED); + + if (sense[1] & SENSE_WRITE_PROTECT) + device->tape_generic_status |= GMT_WR_PROT(~0); + else + device->tape_generic_status &= ~GMT_WR_PROT(~0); + } else + DBF_EVENT(4, "tape_34xx: medium sense failed with rc=%d\n", + request->rc); + tape_free_request(request); +} + +static int tape_34xx_medium_sense(struct tape_device *device) +{ + struct tape_request *request; + int rc; + + request = tape_alloc_request(1, 32); + if (IS_ERR(request)) { + DBF_EXCEPTION(6, "MSEN fail\n"); + return PTR_ERR(request); + } + + request->op = TO_MSEN; + tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata); + rc = tape_do_io_interruptible(device, request); + __tape_34xx_medium_sense(request); + return rc; +} + +static void tape_34xx_medium_sense_async(struct tape_device *device) +{ + struct tape_request *request; + + request = tape_alloc_request(1, 32); + if (IS_ERR(request)) { + DBF_EXCEPTION(6, "MSEN fail\n"); + return; + } + + request->op = TO_MSEN; + tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata); + request->callback = (void *) __tape_34xx_medium_sense; + request->callback_data = NULL; + tape_do_io_async(device, request); +} + +struct tape_34xx_work { + struct tape_device *device; + enum tape_op op; + struct work_struct work; +}; + +/* + * These functions are currently used only to schedule a medium_sense for + * later execution. This is because we get an interrupt whenever a medium + * is inserted but cannot call tape_do_io* from an interrupt context. + * Maybe that's useful for other actions we want to start from the + * interrupt handler. + * Note: the work handler is called by the system work queue. The tape + * commands started by the handler need to be asynchrounous, otherwise + * a deadlock can occur e.g. in case of a deferred cc=1 (see __tape_do_irq). + */ +static void +tape_34xx_work_handler(struct work_struct *work) +{ + struct tape_34xx_work *p = + container_of(work, struct tape_34xx_work, work); + struct tape_device *device = p->device; + + switch(p->op) { + case TO_MSEN: + tape_34xx_medium_sense_async(device); + break; + default: + DBF_EVENT(3, "T34XX: internal error: unknown work\n"); + } + tape_put_device(device); + kfree(p); +} + +static int +tape_34xx_schedule_work(struct tape_device *device, enum tape_op op) +{ + struct tape_34xx_work *p; + + if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL) + return -ENOMEM; + + INIT_WORK(&p->work, tape_34xx_work_handler); + + p->device = tape_get_device(device); + p->op = op; + + schedule_work(&p->work); + return 0; +} + +/* + * Done Handler is called when dev stat = DEVICE-END (successful operation) + */ +static inline int +tape_34xx_done(struct tape_request *request) +{ + DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]); + + switch (request->op) { + case TO_DSE: + case TO_RUN: + case TO_WRI: + case TO_WTM: + case TO_ASSIGN: + case TO_UNASSIGN: + tape_34xx_delete_sbid_from(request->device, 0); + break; + default: + ; + } + return TAPE_IO_SUCCESS; +} + +static inline int +tape_34xx_erp_failed(struct tape_request *request, int rc) +{ + DBF_EVENT(3, "Error recovery failed for %s (RC=%d)\n", + tape_op_verbose[request->op], rc); + return rc; +} + +static inline int +tape_34xx_erp_succeeded(struct tape_request *request) +{ + DBF_EVENT(3, "Error Recovery successful for %s\n", + tape_op_verbose[request->op]); + return tape_34xx_done(request); +} + +static inline int +tape_34xx_erp_retry(struct tape_request *request) +{ + DBF_EVENT(3, "xerp retr %s\n", tape_op_verbose[request->op]); + return TAPE_IO_RETRY; +} + +/* + * This function is called, when no request is outstanding and we get an + * interrupt + */ +static int +tape_34xx_unsolicited_irq(struct tape_device *device, struct irb *irb) +{ + if (irb->scsw.cmd.dstat == 0x85) { /* READY */ + /* A medium was inserted in the drive. */ + DBF_EVENT(6, "xuud med\n"); + tape_34xx_delete_sbid_from(device, 0); + tape_34xx_schedule_work(device, TO_MSEN); + } else { + DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id); + tape_dump_sense_dbf(device, NULL, irb); + } + return TAPE_IO_SUCCESS; +} + +/* + * Read Opposite Error Recovery Function: + * Used, when Read Forward does not work + */ +static int +tape_34xx_erp_read_opposite(struct tape_device *device, + struct tape_request *request) +{ + if (request->op == TO_RFO) { + /* + * We did read forward, but the data could not be read + * *correctly*. We transform the request to a read backward + * and try again. + */ + tape_std_read_backward(device, request); + return tape_34xx_erp_retry(request); + } + + /* + * We tried to read forward and backward, but hat no + * success -> failed. + */ + return tape_34xx_erp_failed(request, -EIO); +} + +static int +tape_34xx_erp_bug(struct tape_device *device, struct tape_request *request, + struct irb *irb, int no) +{ + if (request->op != TO_ASSIGN) { + dev_err(&device->cdev->dev, "An unexpected condition %d " + "occurred in tape error recovery\n", no); + tape_dump_sense_dbf(device, request, irb); + } + return tape_34xx_erp_failed(request, -EIO); +} + +/* + * Handle data overrun between cu and drive. The channel speed might + * be too slow. + */ +static int +tape_34xx_erp_overrun(struct tape_device *device, struct tape_request *request, + struct irb *irb) +{ + if (irb->ecw[3] == 0x40) { + dev_warn (&device->cdev->dev, "A data overrun occurred between" + " the control unit and tape unit\n"); + return tape_34xx_erp_failed(request, -EIO); + } + return tape_34xx_erp_bug(device, request, irb, -1); +} + +/* + * Handle record sequence error. + */ +static int +tape_34xx_erp_sequence(struct tape_device *device, + struct tape_request *request, struct irb *irb) +{ + if (irb->ecw[3] == 0x41) { + /* + * cu detected incorrect block-id sequence on tape. + */ + dev_warn (&device->cdev->dev, "The block ID sequence on the " + "tape is incorrect\n"); + return tape_34xx_erp_failed(request, -EIO); + } + /* + * Record sequence error bit is set, but erpa does not + * show record sequence error. + */ + return tape_34xx_erp_bug(device, request, irb, -2); +} + +/* + * This function analyses the tape's sense-data in case of a unit-check. + * If possible, it tries to recover from the error. Else the user is + * informed about the problem. + */ +static int +tape_34xx_unit_check(struct tape_device *device, struct tape_request *request, + struct irb *irb) +{ + int inhibit_cu_recovery; + __u8* sense; + + inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0; + sense = irb->ecw; + + if ( + sense[0] & SENSE_COMMAND_REJECT && + sense[1] & SENSE_WRITE_PROTECT + ) { + if ( + request->op == TO_DSE || + request->op == TO_WRI || + request->op == TO_WTM + ) { + /* medium is write protected */ + return tape_34xx_erp_failed(request, -EACCES); + } else { + return tape_34xx_erp_bug(device, request, irb, -3); + } + } + + /* + * Special cases for various tape-states when reaching + * end of recorded area + * + * FIXME: Maybe a special case of the special case: + * sense[0] == SENSE_EQUIPMENT_CHECK && + * sense[1] == SENSE_DRIVE_ONLINE && + * sense[3] == 0x47 (Volume Fenced) + * + * This was caused by continued FSF or FSR after an + * 'End Of Data'. + */ + if (( + sense[0] == SENSE_DATA_CHECK || + sense[0] == SENSE_EQUIPMENT_CHECK || + sense[0] == SENSE_EQUIPMENT_CHECK + SENSE_DEFERRED_UNIT_CHECK + ) && ( + sense[1] == SENSE_DRIVE_ONLINE || + sense[1] == SENSE_BEGINNING_OF_TAPE + SENSE_WRITE_MODE + )) { + switch (request->op) { + /* + * sense[0] == SENSE_DATA_CHECK && + * sense[1] == SENSE_DRIVE_ONLINE + * sense[3] == 0x36 (End Of Data) + * + * Further seeks might return a 'Volume Fenced'. + */ + case TO_FSF: + case TO_FSB: + /* Trying to seek beyond end of recorded area */ + return tape_34xx_erp_failed(request, -ENOSPC); + case TO_BSB: + return tape_34xx_erp_retry(request); + + /* + * sense[0] == SENSE_DATA_CHECK && + * sense[1] == SENSE_DRIVE_ONLINE && + * sense[3] == 0x36 (End Of Data) + */ + case TO_LBL: + /* Block could not be located. */ + tape_34xx_delete_sbid_from(device, 0); + return tape_34xx_erp_failed(request, -EIO); + + case TO_RFO: + /* Read beyond end of recorded area -> 0 bytes read */ + return tape_34xx_erp_failed(request, 0); + + /* + * sense[0] == SENSE_EQUIPMENT_CHECK && + * sense[1] == SENSE_DRIVE_ONLINE && + * sense[3] == 0x38 (Physical End Of Volume) + */ + case TO_WRI: + /* Writing at physical end of volume */ + return tape_34xx_erp_failed(request, -ENOSPC); + default: + return tape_34xx_erp_failed(request, 0); + } + } + + /* Sensing special bits */ + if (sense[0] & SENSE_BUS_OUT_CHECK) + return tape_34xx_erp_retry(request); + + if (sense[0] & SENSE_DATA_CHECK) { + /* + * hardware failure, damaged tape or improper + * operating conditions + */ + switch (sense[3]) { + case 0x23: + /* a read data check occurred */ + if ((sense[2] & SENSE_TAPE_SYNC_MODE) || + inhibit_cu_recovery) + // data check is not permanent, may be + // recovered. We always use async-mode with + // cu-recovery, so this should *never* happen. + return tape_34xx_erp_bug(device, request, + irb, -4); + + /* data check is permanent, CU recovery has failed */ + dev_warn (&device->cdev->dev, "A read error occurred " + "that cannot be recovered\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x25: + // a write data check occurred + if ((sense[2] & SENSE_TAPE_SYNC_MODE) || + inhibit_cu_recovery) + // data check is not permanent, may be + // recovered. We always use async-mode with + // cu-recovery, so this should *never* happen. + return tape_34xx_erp_bug(device, request, + irb, -5); + + // data check is permanent, cu-recovery has failed + dev_warn (&device->cdev->dev, "A write error on the " + "tape cannot be recovered\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x26: + /* Data Check (read opposite) occurred. */ + return tape_34xx_erp_read_opposite(device, request); + case 0x28: + /* ID-Mark at tape start couldn't be written */ + dev_warn (&device->cdev->dev, "Writing the ID-mark " + "failed\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x31: + /* Tape void. Tried to read beyond end of device. */ + dev_warn (&device->cdev->dev, "Reading the tape beyond" + " the end of the recorded area failed\n"); + return tape_34xx_erp_failed(request, -ENOSPC); + case 0x41: + /* Record sequence error. */ + dev_warn (&device->cdev->dev, "The tape contains an " + "incorrect block ID sequence\n"); + return tape_34xx_erp_failed(request, -EIO); + default: + /* all data checks for 3480 should result in one of + * the above erpa-codes. For 3490, other data-check + * conditions do exist. */ + if (device->cdev->id.driver_info == tape_3480) + return tape_34xx_erp_bug(device, request, + irb, -6); + } + } + + if (sense[0] & SENSE_OVERRUN) + return tape_34xx_erp_overrun(device, request, irb); + + if (sense[1] & SENSE_RECORD_SEQUENCE_ERR) + return tape_34xx_erp_sequence(device, request, irb); + + /* Sensing erpa codes */ + switch (sense[3]) { + case 0x00: + /* Unit check with erpa code 0. Report and ignore. */ + return TAPE_IO_SUCCESS; + case 0x21: + /* + * Data streaming not operational. CU will switch to + * interlock mode. Reissue the command. + */ + return tape_34xx_erp_retry(request); + case 0x22: + /* + * Path equipment check. Might be drive adapter error, buffer + * error on the lower interface, internal path not usable, + * or error during cartridge load. + */ + dev_warn (&device->cdev->dev, "A path equipment check occurred" + " for the tape device\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x24: + /* + * Load display check. Load display was command was issued, + * but the drive is displaying a drive check message. Can + * be threated as "device end". + */ + return tape_34xx_erp_succeeded(request); + case 0x27: + /* + * Command reject. May indicate illegal channel program or + * buffer over/underrun. Since all channel programs are + * issued by this driver and ought be correct, we assume a + * over/underrun situation and retry the channel program. + */ + return tape_34xx_erp_retry(request); + case 0x29: + /* + * Function incompatible. Either the tape is idrc compressed + * but the hardware isn't capable to do idrc, or a perform + * subsystem func is issued and the CU is not on-line. + */ + return tape_34xx_erp_failed(request, -EIO); + case 0x2a: + /* + * Unsolicited environmental data. An internal counter + * overflows, we can ignore this and reissue the cmd. + */ + return tape_34xx_erp_retry(request); + case 0x2b: + /* + * Environmental data present. Indicates either unload + * completed ok or read buffered log command completed ok. + */ + if (request->op == TO_RUN) { + /* Rewind unload completed ok. */ + tape_med_state_set(device, MS_UNLOADED); + return tape_34xx_erp_succeeded(request); + } + /* tape_34xx doesn't use read buffered log commands. */ + return tape_34xx_erp_bug(device, request, irb, sense[3]); + case 0x2c: + /* + * Permanent equipment check. CU has tried recovery, but + * did not succeed. + */ + return tape_34xx_erp_failed(request, -EIO); + case 0x2d: + /* Data security erase failure. */ + if (request->op == TO_DSE) + return tape_34xx_erp_failed(request, -EIO); + /* Data security erase failure, but no such command issued. */ + return tape_34xx_erp_bug(device, request, irb, sense[3]); + case 0x2e: + /* + * Not capable. This indicates either that the drive fails + * reading the format id mark or that that format specified + * is not supported by the drive. + */ + dev_warn (&device->cdev->dev, "The tape unit cannot process " + "the tape format\n"); + return tape_34xx_erp_failed(request, -EMEDIUMTYPE); + case 0x30: + /* The medium is write protected. */ + dev_warn (&device->cdev->dev, "The tape medium is write-" + "protected\n"); + return tape_34xx_erp_failed(request, -EACCES); + case 0x32: + // Tension loss. We cannot recover this, it's an I/O error. + dev_warn (&device->cdev->dev, "The tape does not have the " + "required tape tension\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x33: + /* + * Load Failure. The cartridge was not inserted correctly or + * the tape is not threaded correctly. + */ + dev_warn (&device->cdev->dev, "The tape unit failed to load" + " the cartridge\n"); + tape_34xx_delete_sbid_from(device, 0); + return tape_34xx_erp_failed(request, -EIO); + case 0x34: + /* + * Unload failure. The drive cannot maintain tape tension + * and control tape movement during an unload operation. + */ + dev_warn (&device->cdev->dev, "Automatic unloading of the tape" + " cartridge failed\n"); + if (request->op == TO_RUN) + return tape_34xx_erp_failed(request, -EIO); + return tape_34xx_erp_bug(device, request, irb, sense[3]); + case 0x35: + /* + * Drive equipment check. One of the following: + * - cu cannot recover from a drive detected error + * - a check code message is shown on drive display + * - the cartridge loader does not respond correctly + * - a failure occurs during an index, load, or unload cycle + */ + dev_warn (&device->cdev->dev, "An equipment check has occurred" + " on the tape unit\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x36: + if (device->cdev->id.driver_info == tape_3490) + /* End of data. */ + return tape_34xx_erp_failed(request, -EIO); + /* This erpa is reserved for 3480 */ + return tape_34xx_erp_bug(device, request, irb, sense[3]); + case 0x37: + /* + * Tape length error. The tape is shorter than reported in + * the beginning-of-tape data. + */ + dev_warn (&device->cdev->dev, "The tape information states an" + " incorrect length\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x38: + /* + * Physical end of tape. A read/write operation reached + * the physical end of tape. + */ + if (request->op==TO_WRI || + request->op==TO_DSE || + request->op==TO_WTM) + return tape_34xx_erp_failed(request, -ENOSPC); + return tape_34xx_erp_failed(request, -EIO); + case 0x39: + /* Backward at Beginning of tape. */ + return tape_34xx_erp_failed(request, -EIO); + case 0x3a: + /* Drive switched to not ready. */ + dev_warn (&device->cdev->dev, "The tape unit is not ready\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x3b: + /* Manual rewind or unload. This causes an I/O error. */ + dev_warn (&device->cdev->dev, "The tape medium has been " + "rewound or unloaded manually\n"); + tape_34xx_delete_sbid_from(device, 0); + return tape_34xx_erp_failed(request, -EIO); + case 0x42: + /* + * Degraded mode. A condition that can cause degraded + * performance is detected. + */ + dev_warn (&device->cdev->dev, "The tape subsystem is running " + "in degraded mode\n"); + return tape_34xx_erp_retry(request); + case 0x43: + /* Drive not ready. */ + tape_34xx_delete_sbid_from(device, 0); + tape_med_state_set(device, MS_UNLOADED); + /* Some commands commands are successful even in this case */ + if (sense[1] & SENSE_DRIVE_ONLINE) { + switch(request->op) { + case TO_ASSIGN: + case TO_UNASSIGN: + case TO_DIS: + case TO_NOP: + return tape_34xx_done(request); + break; + default: + break; + } + } + return tape_34xx_erp_failed(request, -ENOMEDIUM); + case 0x44: + /* Locate Block unsuccessful. */ + if (request->op != TO_BLOCK && request->op != TO_LBL) + /* No locate block was issued. */ + return tape_34xx_erp_bug(device, request, + irb, sense[3]); + return tape_34xx_erp_failed(request, -EIO); + case 0x45: + /* The drive is assigned to a different channel path. */ + dev_warn (&device->cdev->dev, "The tape unit is already " + "assigned\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x46: + /* + * Drive not on-line. Drive may be switched offline, + * the power supply may be switched off or + * the drive address may not be set correctly. + */ + dev_warn (&device->cdev->dev, "The tape unit is not online\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x47: + /* Volume fenced. CU reports volume integrity is lost. */ + dev_warn (&device->cdev->dev, "The control unit has fenced " + "access to the tape volume\n"); + tape_34xx_delete_sbid_from(device, 0); + return tape_34xx_erp_failed(request, -EIO); + case 0x48: + /* Log sense data and retry request. */ + return tape_34xx_erp_retry(request); + case 0x49: + /* Bus out check. A parity check error on the bus was found. */ + dev_warn (&device->cdev->dev, "A parity error occurred on the " + "tape bus\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x4a: + /* Control unit erp failed. */ + dev_warn (&device->cdev->dev, "I/O error recovery failed on " + "the tape control unit\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x4b: + /* + * CU and drive incompatible. The drive requests micro-program + * patches, which are not available on the CU. + */ + dev_warn (&device->cdev->dev, "The tape unit requires a " + "firmware update\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x4c: + /* + * Recovered Check-One failure. Cu develops a hardware error, + * but is able to recover. + */ + return tape_34xx_erp_retry(request); + case 0x4d: + if (device->cdev->id.driver_info == tape_3490) + /* + * Resetting event received. Since the driver does + * not support resetting event recovery (which has to + * be handled by the I/O Layer), retry our command. + */ + return tape_34xx_erp_retry(request); + /* This erpa is reserved for 3480. */ + return tape_34xx_erp_bug(device, request, irb, sense[3]); + case 0x4e: + if (device->cdev->id.driver_info == tape_3490) { + /* + * Maximum block size exceeded. This indicates, that + * the block to be written is larger than allowed for + * buffered mode. + */ + dev_warn (&device->cdev->dev, "The maximum block size" + " for buffered mode is exceeded\n"); + return tape_34xx_erp_failed(request, -ENOBUFS); + } + /* This erpa is reserved for 3480. */ + return tape_34xx_erp_bug(device, request, irb, sense[3]); + case 0x50: + /* + * Read buffered log (Overflow). CU is running in extended + * buffered log mode, and a counter overflows. This should + * never happen, since we're never running in extended + * buffered log mode. + */ + return tape_34xx_erp_retry(request); + case 0x51: + /* + * Read buffered log (EOV). EOF processing occurs while the + * CU is in extended buffered log mode. This should never + * happen, since we're never running in extended buffered + * log mode. + */ + return tape_34xx_erp_retry(request); + case 0x52: + /* End of Volume complete. Rewind unload completed ok. */ + if (request->op == TO_RUN) { + tape_med_state_set(device, MS_UNLOADED); + tape_34xx_delete_sbid_from(device, 0); + return tape_34xx_erp_succeeded(request); + } + return tape_34xx_erp_bug(device, request, irb, sense[3]); + case 0x53: + /* Global command intercept. */ + return tape_34xx_erp_retry(request); + case 0x54: + /* Channel interface recovery (temporary). */ + return tape_34xx_erp_retry(request); + case 0x55: + /* Channel interface recovery (permanent). */ + dev_warn (&device->cdev->dev, "A channel interface error cannot be" + " recovered\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x56: + /* Channel protocol error. */ + dev_warn (&device->cdev->dev, "A channel protocol error " + "occurred\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x57: + /* + * 3480: Attention intercept. + * 3490: Global status intercept. + */ + return tape_34xx_erp_retry(request); + case 0x5a: + /* + * Tape length incompatible. The tape inserted is too long, + * which could cause damage to the tape or the drive. + */ + dev_warn (&device->cdev->dev, "The tape unit does not support " + "the tape length\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x5b: + /* Format 3480 XF incompatible */ + if (sense[1] & SENSE_BEGINNING_OF_TAPE) + /* The tape will get overwritten. */ + return tape_34xx_erp_retry(request); + dev_warn (&device->cdev->dev, "The tape unit does not support" + " format 3480 XF\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x5c: + /* Format 3480-2 XF incompatible */ + dev_warn (&device->cdev->dev, "The tape unit does not support tape " + "format 3480-2 XF\n"); + return tape_34xx_erp_failed(request, -EIO); + case 0x5d: + /* Tape length violation. */ + dev_warn (&device->cdev->dev, "The tape unit does not support" + " the current tape length\n"); + return tape_34xx_erp_failed(request, -EMEDIUMTYPE); + case 0x5e: + /* Compaction algorithm incompatible. */ + dev_warn (&device->cdev->dev, "The tape unit does not support" + " the compaction algorithm\n"); + return tape_34xx_erp_failed(request, -EMEDIUMTYPE); + + /* The following erpas should have been covered earlier. */ + case 0x23: /* Read data check. */ + case 0x25: /* Write data check. */ + case 0x26: /* Data check (read opposite). */ + case 0x28: /* Write id mark check. */ + case 0x31: /* Tape void. */ + case 0x40: /* Overrun error. */ + case 0x41: /* Record sequence error. */ + /* All other erpas are reserved for future use. */ + default: + return tape_34xx_erp_bug(device, request, irb, sense[3]); + } +} + +/* + * 3480/3490 interrupt handler + */ +static int +tape_34xx_irq(struct tape_device *device, struct tape_request *request, + struct irb *irb) +{ + if (request == NULL) + return tape_34xx_unsolicited_irq(device, irb); + + if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) && + (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) && + (request->op == TO_WRI)) { + /* Write at end of volume */ + return tape_34xx_erp_failed(request, -ENOSPC); + } + + if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) + return tape_34xx_unit_check(device, request, irb); + + if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) { + /* + * A unit exception occurs on skipping over a tapemark block. + */ + if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) { + if (request->op == TO_BSB || request->op == TO_FSB) + request->rescnt++; + else + DBF_EVENT(5, "Unit Exception!\n"); + } + return tape_34xx_done(request); + } + + DBF_EVENT(6, "xunknownirq\n"); + tape_dump_sense_dbf(device, request, irb); + return TAPE_IO_STOP; +} + +/* + * ioctl_overload + */ +static int +tape_34xx_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg) +{ + if (cmd == TAPE390_DISPLAY) { + struct display_struct disp; + + if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)) != 0) + return -EFAULT; + + return tape_std_display(device, &disp); + } else + return -EINVAL; +} + +static inline void +tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l) +{ + struct tape_34xx_sbid * new_sbid; + + new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC); + if (!new_sbid) + return; + + new_sbid->bid = bid; + list_add(&new_sbid->list, l); +} + +/* + * Build up the search block ID list. The block ID consists of a logical + * block number and a hardware specific part. The hardware specific part + * helps the tape drive to speed up searching for a specific block. + */ +static void +tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid) +{ + struct list_head * sbid_list; + struct tape_34xx_sbid * sbid; + struct list_head * l; + + /* + * immediately return if there is no list at all or the block to add + * is located in segment 1 of wrap 0 because this position is used + * if no hardware position data is supplied. + */ + sbid_list = (struct list_head *) device->discdata; + if (!sbid_list || (bid.segment < 2 && bid.wrap == 0)) + return; + + /* + * Search the position where to insert the new entry. Hardware + * acceleration uses only the segment and wrap number. So we + * need only one entry for a specific wrap/segment combination. + * If there is a block with a lower number but the same hard- + * ware position data we just update the block number in the + * existing entry. + */ + list_for_each(l, sbid_list) { + sbid = list_entry(l, struct tape_34xx_sbid, list); + + if ( + (sbid->bid.segment == bid.segment) && + (sbid->bid.wrap == bid.wrap) + ) { + if (bid.block < sbid->bid.block) + sbid->bid = bid; + else return; + break; + } + + /* Sort in according to logical block number. */ + if (bid.block < sbid->bid.block) { + tape_34xx_append_new_sbid(bid, l->prev); + break; + } + } + /* List empty or new block bigger than last entry. */ + if (l == sbid_list) + tape_34xx_append_new_sbid(bid, l->prev); + + DBF_LH(4, "Current list is:\n"); + list_for_each(l, sbid_list) { + sbid = list_entry(l, struct tape_34xx_sbid, list); + DBF_LH(4, "%d:%03d@%05d\n", + sbid->bid.wrap, + sbid->bid.segment, + sbid->bid.block + ); + } +} + +/* + * Delete all entries from the search block ID list that belong to tape blocks + * equal or higher than the given number. + */ +static void +tape_34xx_delete_sbid_from(struct tape_device *device, int from) +{ + struct list_head * sbid_list; + struct tape_34xx_sbid * sbid; + struct list_head * l; + struct list_head * n; + + sbid_list = (struct list_head *) device->discdata; + if (!sbid_list) + return; + + list_for_each_safe(l, n, sbid_list) { + sbid = list_entry(l, struct tape_34xx_sbid, list); + if (sbid->bid.block >= from) { + DBF_LH(4, "Delete sbid %d:%03d@%05d\n", + sbid->bid.wrap, + sbid->bid.segment, + sbid->bid.block + ); + list_del(l); + kfree(sbid); + } + } +} + +/* + * Merge hardware position data into a block id. + */ +static void +tape_34xx_merge_sbid( + struct tape_device * device, + struct tape_34xx_block_id * bid +) { + struct tape_34xx_sbid * sbid; + struct tape_34xx_sbid * sbid_to_use; + struct list_head * sbid_list; + struct list_head * l; + + sbid_list = (struct list_head *) device->discdata; + bid->wrap = 0; + bid->segment = 1; + + if (!sbid_list || list_empty(sbid_list)) + return; + + sbid_to_use = NULL; + list_for_each(l, sbid_list) { + sbid = list_entry(l, struct tape_34xx_sbid, list); + + if (sbid->bid.block >= bid->block) + break; + sbid_to_use = sbid; + } + if (sbid_to_use) { + bid->wrap = sbid_to_use->bid.wrap; + bid->segment = sbid_to_use->bid.segment; + DBF_LH(4, "Use %d:%03d@%05d for %05d\n", + sbid_to_use->bid.wrap, + sbid_to_use->bid.segment, + sbid_to_use->bid.block, + bid->block + ); + } +} + +static int +tape_34xx_setup_device(struct tape_device * device) +{ + int rc; + struct list_head * discdata; + + DBF_EVENT(6, "34xx device setup\n"); + if ((rc = tape_std_assign(device)) == 0) { + if ((rc = tape_34xx_medium_sense(device)) != 0) { + DBF_LH(3, "34xx medium sense returned %d\n", rc); + } + } + discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL); + if (discdata) { + INIT_LIST_HEAD(discdata); + device->discdata = discdata; + } + + return rc; +} + +static void +tape_34xx_cleanup_device(struct tape_device *device) +{ + tape_std_unassign(device); + + if (device->discdata) { + tape_34xx_delete_sbid_from(device, 0); + kfree(device->discdata); + device->discdata = NULL; + } +} + + +/* + * MTTELL: Tell block. Return the number of block relative to current file. + */ +static int +tape_34xx_mttell(struct tape_device *device, int mt_count) +{ + struct { + struct tape_34xx_block_id cbid; + struct tape_34xx_block_id dbid; + } __attribute__ ((packed)) block_id; + int rc; + + rc = tape_std_read_block_id(device, (__u64 *) &block_id); + if (rc) + return rc; + + tape_34xx_add_sbid(device, block_id.cbid); + return block_id.cbid.block; +} + +/* + * MTSEEK: seek to the specified block. + */ +static int +tape_34xx_mtseek(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + struct tape_34xx_block_id * bid; + + if (mt_count > 0x3fffff) { + DBF_EXCEPTION(6, "xsee parm\n"); + return -EINVAL; + } + request = tape_alloc_request(3, 4); + if (IS_ERR(request)) + return PTR_ERR(request); + + /* setup ccws */ + request->op = TO_LBL; + bid = (struct tape_34xx_block_id *) request->cpdata; + bid->format = (*device->modeset_byte & 0x08) ? + TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480; + bid->block = mt_count; + tape_34xx_merge_sbid(device, bid); + + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); + tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); + + /* execute it */ + return tape_do_io_free(device, request); +} + +/* + * List of 3480/3490 magnetic tape commands. + */ +static tape_mtop_fn tape_34xx_mtop[TAPE_NR_MTOPS] = { + [MTRESET] = tape_std_mtreset, + [MTFSF] = tape_std_mtfsf, + [MTBSF] = tape_std_mtbsf, + [MTFSR] = tape_std_mtfsr, + [MTBSR] = tape_std_mtbsr, + [MTWEOF] = tape_std_mtweof, + [MTREW] = tape_std_mtrew, + [MTOFFL] = tape_std_mtoffl, + [MTNOP] = tape_std_mtnop, + [MTRETEN] = tape_std_mtreten, + [MTBSFM] = tape_std_mtbsfm, + [MTFSFM] = tape_std_mtfsfm, + [MTEOM] = tape_std_mteom, + [MTERASE] = tape_std_mterase, + [MTRAS1] = NULL, + [MTRAS2] = NULL, + [MTRAS3] = NULL, + [MTSETBLK] = tape_std_mtsetblk, + [MTSETDENSITY] = NULL, + [MTSEEK] = tape_34xx_mtseek, + [MTTELL] = tape_34xx_mttell, + [MTSETDRVBUFFER] = NULL, + [MTFSS] = NULL, + [MTBSS] = NULL, + [MTWSM] = NULL, + [MTLOCK] = NULL, + [MTUNLOCK] = NULL, + [MTLOAD] = tape_std_mtload, + [MTUNLOAD] = tape_std_mtunload, + [MTCOMPRESSION] = tape_std_mtcompression, + [MTSETPART] = NULL, + [MTMKPART] = NULL +}; + +/* + * Tape discipline structure for 3480 and 3490. + */ +static struct tape_discipline tape_discipline_34xx = { + .owner = THIS_MODULE, + .setup_device = tape_34xx_setup_device, + .cleanup_device = tape_34xx_cleanup_device, + .process_eov = tape_std_process_eov, + .irq = tape_34xx_irq, + .read_block = tape_std_read_block, + .write_block = tape_std_write_block, + .ioctl_fn = tape_34xx_ioctl, + .mtop_array = tape_34xx_mtop +}; + +static struct ccw_device_id tape_34xx_ids[] = { + { CCW_DEVICE_DEVTYPE(0x3480, 0, 0x3480, 0), .driver_info = tape_3480}, + { CCW_DEVICE_DEVTYPE(0x3490, 0, 0x3490, 0), .driver_info = tape_3490}, + { /* end of list */ }, +}; + +static int +tape_34xx_online(struct ccw_device *cdev) +{ + return tape_generic_online( + dev_get_drvdata(&cdev->dev), + &tape_discipline_34xx + ); +} + +static struct ccw_driver tape_34xx_driver = { + .driver = { + .name = "tape_34xx", + .owner = THIS_MODULE, + }, + .ids = tape_34xx_ids, + .probe = tape_generic_probe, + .remove = tape_generic_remove, + .set_online = tape_34xx_online, + .set_offline = tape_generic_offline, + .freeze = tape_generic_pm_suspend, + .int_class = IRQIO_TAP, +}; + +static int +tape_34xx_init (void) +{ + int rc; + + TAPE_DBF_AREA = debug_register ( "tape_34xx", 2, 2, 4*sizeof(long)); + debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); +#ifdef DBF_LIKE_HELL + debug_set_level(TAPE_DBF_AREA, 6); +#endif + + DBF_EVENT(3, "34xx init\n"); + /* Register driver for 3480/3490 tapes. */ + rc = ccw_driver_register(&tape_34xx_driver); + if (rc) + DBF_EVENT(3, "34xx init failed\n"); + else + DBF_EVENT(3, "34xx registered\n"); + return rc; +} + +static void +tape_34xx_exit(void) +{ + ccw_driver_unregister(&tape_34xx_driver); + + debug_unregister(TAPE_DBF_AREA); +} + +MODULE_DEVICE_TABLE(ccw, tape_34xx_ids); +MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH"); +MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape device driver"); +MODULE_LICENSE("GPL"); + +module_init(tape_34xx_init); +module_exit(tape_34xx_exit); diff --git a/drivers/s390/char/tape_3590.c b/drivers/s390/char/tape_3590.c new file mode 100644 index 000000000..cdcde18e7 --- /dev/null +++ b/drivers/s390/char/tape_3590.c @@ -0,0 +1,1702 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * tape device discipline for 3590 tapes. + * + * Copyright IBM Corp. 2001, 2009 + * Author(s): Stefan Bader + * Michael Holzheu + * Martin Schwidefsky + */ + +#define KMSG_COMPONENT "tape_3590" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include + +#define TAPE_DBF_AREA tape_3590_dbf +#define BUFSIZE 512 /* size of buffers for dynamic generated messages */ + +#include "tape.h" +#include "tape_std.h" +#include "tape_3590.h" + +static struct workqueue_struct *tape_3590_wq; + +/* + * Pointer to debug area. + */ +debug_info_t *TAPE_DBF_AREA = NULL; +EXPORT_SYMBOL(TAPE_DBF_AREA); + +/******************************************************************* + * Error Recovery functions: + * - Read Opposite: implemented + * - Read Device (buffered) log: BRA + * - Read Library log: BRA + * - Swap Devices: BRA + * - Long Busy: implemented + * - Special Intercept: BRA + * - Read Alternate: implemented + *******************************************************************/ + +static const char *tape_3590_msg[TAPE_3590_MAX_MSG] = { + [0x00] = "", + [0x10] = "Lost Sense", + [0x11] = "Assigned Elsewhere", + [0x12] = "Allegiance Reset", + [0x13] = "Shared Access Violation", + [0x20] = "Command Reject", + [0x21] = "Configuration Error", + [0x22] = "Protection Exception", + [0x23] = "Write Protect", + [0x24] = "Write Length", + [0x25] = "Read-Only Format", + [0x31] = "Beginning of Partition", + [0x33] = "End of Partition", + [0x34] = "End of Data", + [0x35] = "Block not found", + [0x40] = "Device Intervention", + [0x41] = "Loader Intervention", + [0x42] = "Library Intervention", + [0x50] = "Write Error", + [0x51] = "Erase Error", + [0x52] = "Formatting Error", + [0x53] = "Read Error", + [0x54] = "Unsupported Format", + [0x55] = "No Formatting", + [0x56] = "Positioning lost", + [0x57] = "Read Length", + [0x60] = "Unsupported Medium", + [0x61] = "Medium Length Error", + [0x62] = "Medium removed", + [0x64] = "Load Check", + [0x65] = "Unload Check", + [0x70] = "Equipment Check", + [0x71] = "Bus out Check", + [0x72] = "Protocol Error", + [0x73] = "Interface Error", + [0x74] = "Overrun", + [0x75] = "Halt Signal", + [0x90] = "Device fenced", + [0x91] = "Device Path fenced", + [0xa0] = "Volume misplaced", + [0xa1] = "Volume inaccessible", + [0xa2] = "Volume in input", + [0xa3] = "Volume ejected", + [0xa4] = "All categories reserved", + [0xa5] = "Duplicate Volume", + [0xa6] = "Library Manager Offline", + [0xa7] = "Library Output Station full", + [0xa8] = "Vision System non-operational", + [0xa9] = "Library Manager Equipment Check", + [0xaa] = "Library Equipment Check", + [0xab] = "All Library Cells full", + [0xac] = "No Cleaner Volumes in Library", + [0xad] = "I/O Station door open", + [0xae] = "Subsystem environmental alert", +}; + +static int crypt_supported(struct tape_device *device) +{ + return TAPE390_CRYPT_SUPPORTED(TAPE_3590_CRYPT_INFO(device)); +} + +static int crypt_enabled(struct tape_device *device) +{ + return TAPE390_CRYPT_ON(TAPE_3590_CRYPT_INFO(device)); +} + +static void ext_to_int_kekl(struct tape390_kekl *in, + struct tape3592_kekl *out) +{ + int len; + + memset(out, 0, sizeof(*out)); + if (in->type == TAPE390_KEKL_TYPE_HASH) + out->flags |= 0x40; + if (in->type_on_tape == TAPE390_KEKL_TYPE_HASH) + out->flags |= 0x80; + len = min(sizeof(out->label), strlen(in->label)); + memcpy(out->label, in->label, len); + memset(out->label + len, ' ', sizeof(out->label) - len); + ASCEBC(out->label, sizeof(out->label)); +} + +static void int_to_ext_kekl(struct tape3592_kekl *in, + struct tape390_kekl *out) +{ + memset(out, 0, sizeof(*out)); + if(in->flags & 0x40) + out->type = TAPE390_KEKL_TYPE_HASH; + else + out->type = TAPE390_KEKL_TYPE_LABEL; + if(in->flags & 0x80) + out->type_on_tape = TAPE390_KEKL_TYPE_HASH; + else + out->type_on_tape = TAPE390_KEKL_TYPE_LABEL; + memcpy(out->label, in->label, sizeof(in->label)); + EBCASC(out->label, sizeof(in->label)); + strim(out->label); +} + +static void int_to_ext_kekl_pair(struct tape3592_kekl_pair *in, + struct tape390_kekl_pair *out) +{ + if (in->count == 0) { + out->kekl[0].type = TAPE390_KEKL_TYPE_NONE; + out->kekl[0].type_on_tape = TAPE390_KEKL_TYPE_NONE; + out->kekl[1].type = TAPE390_KEKL_TYPE_NONE; + out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE; + } else if (in->count == 1) { + int_to_ext_kekl(&in->kekl[0], &out->kekl[0]); + out->kekl[1].type = TAPE390_KEKL_TYPE_NONE; + out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE; + } else if (in->count == 2) { + int_to_ext_kekl(&in->kekl[0], &out->kekl[0]); + int_to_ext_kekl(&in->kekl[1], &out->kekl[1]); + } else { + printk("Invalid KEKL number: %d\n", in->count); + BUG(); + } +} + +static int check_ext_kekl(struct tape390_kekl *kekl) +{ + if (kekl->type == TAPE390_KEKL_TYPE_NONE) + goto invalid; + if (kekl->type > TAPE390_KEKL_TYPE_HASH) + goto invalid; + if (kekl->type_on_tape == TAPE390_KEKL_TYPE_NONE) + goto invalid; + if (kekl->type_on_tape > TAPE390_KEKL_TYPE_HASH) + goto invalid; + if ((kekl->type == TAPE390_KEKL_TYPE_HASH) && + (kekl->type_on_tape == TAPE390_KEKL_TYPE_LABEL)) + goto invalid; + + return 0; +invalid: + return -EINVAL; +} + +static int check_ext_kekl_pair(struct tape390_kekl_pair *kekls) +{ + if (check_ext_kekl(&kekls->kekl[0])) + goto invalid; + if (check_ext_kekl(&kekls->kekl[1])) + goto invalid; + + return 0; +invalid: + return -EINVAL; +} + +/* + * Query KEKLs + */ +static int tape_3592_kekl_query(struct tape_device *device, + struct tape390_kekl_pair *ext_kekls) +{ + struct tape_request *request; + struct tape3592_kekl_query_order *order; + struct tape3592_kekl_query_data *int_kekls; + int rc; + + DBF_EVENT(6, "tape3592_kekl_query\n"); + int_kekls = kmalloc(sizeof(*int_kekls), GFP_KERNEL|GFP_DMA); + if (!int_kekls) + return -ENOMEM; + request = tape_alloc_request(2, sizeof(*order)); + if (IS_ERR(request)) { + rc = PTR_ERR(request); + goto fail_malloc; + } + order = request->cpdata; + memset(order,0,sizeof(*order)); + order->code = 0xe2; + order->max_count = 2; + request->op = TO_KEKL_QUERY; + tape_ccw_cc(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order); + tape_ccw_end(request->cpaddr + 1, READ_SS_DATA, sizeof(*int_kekls), + int_kekls); + rc = tape_do_io(device, request); + if (rc) + goto fail_request; + int_to_ext_kekl_pair(&int_kekls->kekls, ext_kekls); + + rc = 0; +fail_request: + tape_free_request(request); +fail_malloc: + kfree(int_kekls); + return rc; +} + +/* + * IOCTL: Query KEKLs + */ +static int tape_3592_ioctl_kekl_query(struct tape_device *device, + unsigned long arg) +{ + int rc; + struct tape390_kekl_pair *ext_kekls; + + DBF_EVENT(6, "tape_3592_ioctl_kekl_query\n"); + if (!crypt_supported(device)) + return -ENOSYS; + if (!crypt_enabled(device)) + return -EUNATCH; + ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL); + if (!ext_kekls) + return -ENOMEM; + rc = tape_3592_kekl_query(device, ext_kekls); + if (rc != 0) + goto fail; + if (copy_to_user((char __user *) arg, ext_kekls, sizeof(*ext_kekls))) { + rc = -EFAULT; + goto fail; + } + rc = 0; +fail: + kfree(ext_kekls); + return rc; +} + +static int tape_3590_mttell(struct tape_device *device, int mt_count); + +/* + * Set KEKLs + */ +static int tape_3592_kekl_set(struct tape_device *device, + struct tape390_kekl_pair *ext_kekls) +{ + struct tape_request *request; + struct tape3592_kekl_set_order *order; + + DBF_EVENT(6, "tape3592_kekl_set\n"); + if (check_ext_kekl_pair(ext_kekls)) { + DBF_EVENT(6, "invalid kekls\n"); + return -EINVAL; + } + if (tape_3590_mttell(device, 0) != 0) + return -EBADSLT; + request = tape_alloc_request(1, sizeof(*order)); + if (IS_ERR(request)) + return PTR_ERR(request); + order = request->cpdata; + memset(order, 0, sizeof(*order)); + order->code = 0xe3; + order->kekls.count = 2; + ext_to_int_kekl(&ext_kekls->kekl[0], &order->kekls.kekl[0]); + ext_to_int_kekl(&ext_kekls->kekl[1], &order->kekls.kekl[1]); + request->op = TO_KEKL_SET; + tape_ccw_end(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order); + + return tape_do_io_free(device, request); +} + +/* + * IOCTL: Set KEKLs + */ +static int tape_3592_ioctl_kekl_set(struct tape_device *device, + unsigned long arg) +{ + int rc; + struct tape390_kekl_pair *ext_kekls; + + DBF_EVENT(6, "tape_3592_ioctl_kekl_set\n"); + if (!crypt_supported(device)) + return -ENOSYS; + if (!crypt_enabled(device)) + return -EUNATCH; + ext_kekls = memdup_user((char __user *)arg, sizeof(*ext_kekls)); + if (IS_ERR(ext_kekls)) + return PTR_ERR(ext_kekls); + rc = tape_3592_kekl_set(device, ext_kekls); + kfree(ext_kekls); + return rc; +} + +/* + * Enable encryption + */ +static struct tape_request *__tape_3592_enable_crypt(struct tape_device *device) +{ + struct tape_request *request; + char *data; + + DBF_EVENT(6, "tape_3592_enable_crypt\n"); + if (!crypt_supported(device)) + return ERR_PTR(-ENOSYS); + request = tape_alloc_request(2, 72); + if (IS_ERR(request)) + return request; + data = request->cpdata; + memset(data,0,72); + + data[0] = 0x05; + data[36 + 0] = 0x03; + data[36 + 1] = 0x03; + data[36 + 4] = 0x40; + data[36 + 6] = 0x01; + data[36 + 14] = 0x2f; + data[36 + 18] = 0xc3; + data[36 + 35] = 0x72; + request->op = TO_CRYPT_ON; + tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data); + tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36); + return request; +} + +static int tape_3592_enable_crypt(struct tape_device *device) +{ + struct tape_request *request; + + request = __tape_3592_enable_crypt(device); + if (IS_ERR(request)) + return PTR_ERR(request); + return tape_do_io_free(device, request); +} + +static void tape_3592_enable_crypt_async(struct tape_device *device) +{ + struct tape_request *request; + + request = __tape_3592_enable_crypt(device); + if (!IS_ERR(request)) + tape_do_io_async_free(device, request); +} + +/* + * Disable encryption + */ +static struct tape_request *__tape_3592_disable_crypt(struct tape_device *device) +{ + struct tape_request *request; + char *data; + + DBF_EVENT(6, "tape_3592_disable_crypt\n"); + if (!crypt_supported(device)) + return ERR_PTR(-ENOSYS); + request = tape_alloc_request(2, 72); + if (IS_ERR(request)) + return request; + data = request->cpdata; + memset(data,0,72); + + data[0] = 0x05; + data[36 + 0] = 0x03; + data[36 + 1] = 0x03; + data[36 + 35] = 0x32; + + request->op = TO_CRYPT_OFF; + tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data); + tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36); + + return request; +} + +static int tape_3592_disable_crypt(struct tape_device *device) +{ + struct tape_request *request; + + request = __tape_3592_disable_crypt(device); + if (IS_ERR(request)) + return PTR_ERR(request); + return tape_do_io_free(device, request); +} + +static void tape_3592_disable_crypt_async(struct tape_device *device) +{ + struct tape_request *request; + + request = __tape_3592_disable_crypt(device); + if (!IS_ERR(request)) + tape_do_io_async_free(device, request); +} + +/* + * IOCTL: Set encryption status + */ +static int tape_3592_ioctl_crypt_set(struct tape_device *device, + unsigned long arg) +{ + struct tape390_crypt_info info; + + DBF_EVENT(6, "tape_3592_ioctl_crypt_set\n"); + if (!crypt_supported(device)) + return -ENOSYS; + if (copy_from_user(&info, (char __user *)arg, sizeof(info))) + return -EFAULT; + if (info.status & ~TAPE390_CRYPT_ON_MASK) + return -EINVAL; + if (info.status & TAPE390_CRYPT_ON_MASK) + return tape_3592_enable_crypt(device); + else + return tape_3592_disable_crypt(device); +} + +static int tape_3590_sense_medium(struct tape_device *device); + +/* + * IOCTL: Query enryption status + */ +static int tape_3592_ioctl_crypt_query(struct tape_device *device, + unsigned long arg) +{ + DBF_EVENT(6, "tape_3592_ioctl_crypt_query\n"); + if (!crypt_supported(device)) + return -ENOSYS; + tape_3590_sense_medium(device); + if (copy_to_user((char __user *) arg, &TAPE_3590_CRYPT_INFO(device), + sizeof(TAPE_3590_CRYPT_INFO(device)))) + return -EFAULT; + else + return 0; +} + +/* + * 3590 IOCTL Overload + */ +static int +tape_3590_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg) +{ + switch (cmd) { + case TAPE390_DISPLAY: { + struct display_struct disp; + + if (copy_from_user(&disp, (char __user *) arg, sizeof(disp))) + return -EFAULT; + + return tape_std_display(device, &disp); + } + case TAPE390_KEKL_SET: + return tape_3592_ioctl_kekl_set(device, arg); + case TAPE390_KEKL_QUERY: + return tape_3592_ioctl_kekl_query(device, arg); + case TAPE390_CRYPT_SET: + return tape_3592_ioctl_crypt_set(device, arg); + case TAPE390_CRYPT_QUERY: + return tape_3592_ioctl_crypt_query(device, arg); + default: + return -EINVAL; /* no additional ioctls */ + } +} + +/* + * SENSE Medium: Get Sense data about medium state + */ +static int tape_3590_sense_medium(struct tape_device *device) +{ + struct tape_request *request; + + request = tape_alloc_request(1, 128); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_MSEN; + tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata); + return tape_do_io_free(device, request); +} + +static void tape_3590_sense_medium_async(struct tape_device *device) +{ + struct tape_request *request; + + request = tape_alloc_request(1, 128); + if (IS_ERR(request)) + return; + request->op = TO_MSEN; + tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata); + tape_do_io_async_free(device, request); +} + +/* + * MTTELL: Tell block. Return the number of block relative to current file. + */ +static int +tape_3590_mttell(struct tape_device *device, int mt_count) +{ + __u64 block_id; + int rc; + + rc = tape_std_read_block_id(device, &block_id); + if (rc) + return rc; + return block_id >> 32; +} + +/* + * MTSEEK: seek to the specified block. + */ +static int +tape_3590_mtseek(struct tape_device *device, int count) +{ + struct tape_request *request; + + DBF_EVENT(6, "xsee id: %x\n", count); + request = tape_alloc_request(3, 4); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_LBL; + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + *(__u32 *) request->cpdata = count; + tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); + tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); + return tape_do_io_free(device, request); +} + +/* + * Read Opposite Error Recovery Function: + * Used, when Read Forward does not work + */ +static void +tape_3590_read_opposite(struct tape_device *device, + struct tape_request *request) +{ + struct tape_3590_disc_data *data; + + /* + * We have allocated 4 ccws in tape_std_read, so we can now + * transform the request to a read backward, followed by a + * forward space block. + */ + request->op = TO_RBA; + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + data = device->discdata; + tape_ccw_cc_idal(request->cpaddr + 1, data->read_back_op, + device->char_data.idal_buf); + tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL); + tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL); + DBF_EVENT(6, "xrop ccwg\n"); +} + +/* + * Read Attention Msg + * This should be done after an interrupt with attention bit (0x80) + * in device state. + * + * After a "read attention message" request there are two possible + * results: + * + * 1. A unit check is presented, when attention sense is present (e.g. when + * a medium has been unloaded). The attention sense comes then + * together with the unit check. The recovery action is either "retry" + * (in case there is an attention message pending) or "permanent error". + * + * 2. The attention msg is written to the "read subsystem data" buffer. + * In this case we probably should print it to the console. + */ +static void tape_3590_read_attmsg_async(struct tape_device *device) +{ + struct tape_request *request; + char *buf; + + request = tape_alloc_request(3, 4096); + if (IS_ERR(request)) + return; + request->op = TO_READ_ATTMSG; + buf = request->cpdata; + buf[0] = PREP_RD_SS_DATA; + buf[6] = RD_ATTMSG; /* read att msg */ + tape_ccw_cc(request->cpaddr, PERFORM_SS_FUNC, 12, buf); + tape_ccw_cc(request->cpaddr + 1, READ_SS_DATA, 4096 - 12, buf + 12); + tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); + tape_do_io_async_free(device, request); +} + +/* + * These functions are used to schedule follow-up actions from within an + * interrupt context (like unsolicited interrupts). + * Note: the work handler is called by the system work queue. The tape + * commands started by the handler need to be asynchrounous, otherwise + * a deadlock can occur e.g. in case of a deferred cc=1 (see __tape_do_irq). + */ +struct work_handler_data { + struct tape_device *device; + enum tape_op op; + struct work_struct work; +}; + +static void +tape_3590_work_handler(struct work_struct *work) +{ + struct work_handler_data *p = + container_of(work, struct work_handler_data, work); + + switch (p->op) { + case TO_MSEN: + tape_3590_sense_medium_async(p->device); + break; + case TO_READ_ATTMSG: + tape_3590_read_attmsg_async(p->device); + break; + case TO_CRYPT_ON: + tape_3592_enable_crypt_async(p->device); + break; + case TO_CRYPT_OFF: + tape_3592_disable_crypt_async(p->device); + break; + default: + DBF_EVENT(3, "T3590: work handler undefined for " + "operation 0x%02x\n", p->op); + } + tape_put_device(p->device); + kfree(p); +} + +static int +tape_3590_schedule_work(struct tape_device *device, enum tape_op op) +{ + struct work_handler_data *p; + + if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL) + return -ENOMEM; + + INIT_WORK(&p->work, tape_3590_work_handler); + + p->device = tape_get_device(device); + p->op = op; + + queue_work(tape_3590_wq, &p->work); + return 0; +} + +static void tape_3590_med_state_set(struct tape_device *device, + struct tape_3590_med_sense *sense) +{ + struct tape390_crypt_info *c_info; + + c_info = &TAPE_3590_CRYPT_INFO(device); + + DBF_EVENT(6, "medium state: %x:%x\n", sense->macst, sense->masst); + switch (sense->macst) { + case 0x04: + case 0x05: + case 0x06: + tape_med_state_set(device, MS_UNLOADED); + TAPE_3590_CRYPT_INFO(device).medium_status = 0; + return; + case 0x08: + case 0x09: + tape_med_state_set(device, MS_LOADED); + break; + default: + tape_med_state_set(device, MS_UNKNOWN); + return; + } + c_info->medium_status |= TAPE390_MEDIUM_LOADED_MASK; + if (sense->flags & MSENSE_CRYPT_MASK) { + DBF_EVENT(6, "Medium is encrypted (%04x)\n", sense->flags); + c_info->medium_status |= TAPE390_MEDIUM_ENCRYPTED_MASK; + } else { + DBF_EVENT(6, "Medium is not encrypted %04x\n", sense->flags); + c_info->medium_status &= ~TAPE390_MEDIUM_ENCRYPTED_MASK; + } +} + +/* + * The done handler is called at device/channel end and wakes up the sleeping + * process + */ +static int +tape_3590_done(struct tape_device *device, struct tape_request *request) +{ + + DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]); + + switch (request->op) { + case TO_BSB: + case TO_BSF: + case TO_DSE: + case TO_FSB: + case TO_FSF: + case TO_LBL: + case TO_RFO: + case TO_RBA: + case TO_REW: + case TO_WRI: + case TO_WTM: + case TO_BLOCK: + case TO_LOAD: + tape_med_state_set(device, MS_LOADED); + break; + case TO_RUN: + tape_med_state_set(device, MS_UNLOADED); + tape_3590_schedule_work(device, TO_CRYPT_OFF); + break; + case TO_MSEN: + tape_3590_med_state_set(device, request->cpdata); + break; + case TO_CRYPT_ON: + TAPE_3590_CRYPT_INFO(device).status + |= TAPE390_CRYPT_ON_MASK; + *(device->modeset_byte) |= 0x03; + break; + case TO_CRYPT_OFF: + TAPE_3590_CRYPT_INFO(device).status + &= ~TAPE390_CRYPT_ON_MASK; + *(device->modeset_byte) &= ~0x03; + break; + case TO_RBI: /* RBI seems to succeed even without medium loaded. */ + case TO_NOP: /* Same to NOP. */ + case TO_READ_CONFIG: + case TO_READ_ATTMSG: + case TO_DIS: + case TO_ASSIGN: + case TO_UNASSIGN: + case TO_SIZE: + case TO_KEKL_SET: + case TO_KEKL_QUERY: + case TO_RDC: + break; + } + return TAPE_IO_SUCCESS; +} + +/* + * This function is called, when error recovery was successful + */ +static inline int +tape_3590_erp_succeded(struct tape_device *device, struct tape_request *request) +{ + DBF_EVENT(3, "Error Recovery successful for %s\n", + tape_op_verbose[request->op]); + return tape_3590_done(device, request); +} + +/* + * This function is called, when error recovery was not successful + */ +static inline int +tape_3590_erp_failed(struct tape_device *device, struct tape_request *request, + struct irb *irb, int rc) +{ + DBF_EVENT(3, "Error Recovery failed for %s\n", + tape_op_verbose[request->op]); + tape_dump_sense_dbf(device, request, irb); + return rc; +} + +/* + * Error Recovery do retry + */ +static inline int +tape_3590_erp_retry(struct tape_device *device, struct tape_request *request, + struct irb *irb) +{ + DBF_EVENT(2, "Retry: %s\n", tape_op_verbose[request->op]); + tape_dump_sense_dbf(device, request, irb); + return TAPE_IO_RETRY; +} + +/* + * Handle unsolicited interrupts + */ +static int +tape_3590_unsolicited_irq(struct tape_device *device, struct irb *irb) +{ + if (irb->scsw.cmd.dstat == DEV_STAT_CHN_END) + /* Probably result of halt ssch */ + return TAPE_IO_PENDING; + else if (irb->scsw.cmd.dstat == 0x85) + /* Device Ready */ + DBF_EVENT(3, "unsol.irq! tape ready: %08x\n", device->cdev_id); + else if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { + tape_3590_schedule_work(device, TO_READ_ATTMSG); + } else { + DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id); + tape_dump_sense_dbf(device, NULL, irb); + } + /* check medium state */ + tape_3590_schedule_work(device, TO_MSEN); + return TAPE_IO_SUCCESS; +} + +/* + * Basic Recovery routine + */ +static int +tape_3590_erp_basic(struct tape_device *device, struct tape_request *request, + struct irb *irb, int rc) +{ + struct tape_3590_sense *sense; + + sense = (struct tape_3590_sense *) irb->ecw; + + switch (sense->bra) { + case SENSE_BRA_PER: + return tape_3590_erp_failed(device, request, irb, rc); + case SENSE_BRA_CONT: + return tape_3590_erp_succeded(device, request); + case SENSE_BRA_RE: + return tape_3590_erp_retry(device, request, irb); + case SENSE_BRA_DRE: + return tape_3590_erp_failed(device, request, irb, rc); + default: + BUG(); + return TAPE_IO_STOP; + } +} + +/* + * RDL: Read Device (buffered) log + */ +static int +tape_3590_erp_read_buf_log(struct tape_device *device, + struct tape_request *request, struct irb *irb) +{ + /* + * We just do the basic error recovery at the moment (retry). + * Perhaps in the future, we read the log and dump it somewhere... + */ + return tape_3590_erp_basic(device, request, irb, -EIO); +} + +/* + * SWAP: Swap Devices + */ +static int +tape_3590_erp_swap(struct tape_device *device, struct tape_request *request, + struct irb *irb) +{ + /* + * This error recovery should swap the tapes + * if the original has a problem. The operation + * should proceed with the new tape... this + * should probably be done in user space! + */ + dev_warn (&device->cdev->dev, "The tape medium must be loaded into a " + "different tape unit\n"); + return tape_3590_erp_basic(device, request, irb, -EIO); +} + +/* + * LBY: Long Busy + */ +static int +tape_3590_erp_long_busy(struct tape_device *device, + struct tape_request *request, struct irb *irb) +{ + DBF_EVENT(6, "Device is busy\n"); + return TAPE_IO_LONG_BUSY; +} + +/* + * SPI: Special Intercept + */ +static int +tape_3590_erp_special_interrupt(struct tape_device *device, + struct tape_request *request, struct irb *irb) +{ + return tape_3590_erp_basic(device, request, irb, -EIO); +} + +/* + * RDA: Read Alternate + */ +static int +tape_3590_erp_read_alternate(struct tape_device *device, + struct tape_request *request, struct irb *irb) +{ + struct tape_3590_disc_data *data; + + /* + * The issued Read Backward or Read Previous command is not + * supported by the device + * The recovery action should be to issue another command: + * Read Revious: if Read Backward is not supported + * Read Backward: if Read Previous is not supported + */ + data = device->discdata; + if (data->read_back_op == READ_PREVIOUS) { + DBF_EVENT(2, "(%08x): No support for READ_PREVIOUS command\n", + device->cdev_id); + data->read_back_op = READ_BACKWARD; + } else { + DBF_EVENT(2, "(%08x): No support for READ_BACKWARD command\n", + device->cdev_id); + data->read_back_op = READ_PREVIOUS; + } + tape_3590_read_opposite(device, request); + return tape_3590_erp_retry(device, request, irb); +} + +/* + * Error Recovery read opposite + */ +static int +tape_3590_erp_read_opposite(struct tape_device *device, + struct tape_request *request, struct irb *irb) +{ + switch (request->op) { + case TO_RFO: + /* + * We did read forward, but the data could not be read. + * We will read backward and then skip forward again. + */ + tape_3590_read_opposite(device, request); + return tape_3590_erp_retry(device, request, irb); + case TO_RBA: + /* We tried to read forward and backward, but hat no success */ + return tape_3590_erp_failed(device, request, irb, -EIO); + break; + default: + return tape_3590_erp_failed(device, request, irb, -EIO); + } +} + +/* + * Print an MIM (Media Information Message) (message code f0) + */ +static void +tape_3590_print_mim_msg_f0(struct tape_device *device, struct irb *irb) +{ + struct tape_3590_sense *sense; + char *exception, *service; + + exception = kmalloc(BUFSIZE, GFP_ATOMIC); + service = kmalloc(BUFSIZE, GFP_ATOMIC); + + if (!exception || !service) + goto out_nomem; + + sense = (struct tape_3590_sense *) irb->ecw; + /* Exception Message */ + switch (sense->fmt.f70.emc) { + case 0x02: + snprintf(exception, BUFSIZE, "Data degraded"); + break; + case 0x03: + snprintf(exception, BUFSIZE, "Data degraded in partion %i", + sense->fmt.f70.mp); + break; + case 0x04: + snprintf(exception, BUFSIZE, "Medium degraded"); + break; + case 0x05: + snprintf(exception, BUFSIZE, "Medium degraded in partition %i", + sense->fmt.f70.mp); + break; + case 0x06: + snprintf(exception, BUFSIZE, "Block 0 Error"); + break; + case 0x07: + snprintf(exception, BUFSIZE, "Medium Exception 0x%02x", + sense->fmt.f70.md); + break; + default: + snprintf(exception, BUFSIZE, "0x%02x", + sense->fmt.f70.emc); + break; + } + /* Service Message */ + switch (sense->fmt.f70.smc) { + case 0x02: + snprintf(service, BUFSIZE, "Reference Media maintenance " + "procedure %i", sense->fmt.f70.md); + break; + default: + snprintf(service, BUFSIZE, "0x%02x", + sense->fmt.f70.smc); + break; + } + + dev_warn (&device->cdev->dev, "Tape media information: exception %s, " + "service %s\n", exception, service); + +out_nomem: + kfree(exception); + kfree(service); +} + +/* + * Print an I/O Subsystem Service Information Message (message code f1) + */ +static void +tape_3590_print_io_sim_msg_f1(struct tape_device *device, struct irb *irb) +{ + struct tape_3590_sense *sense; + char *exception, *service; + + exception = kmalloc(BUFSIZE, GFP_ATOMIC); + service = kmalloc(BUFSIZE, GFP_ATOMIC); + + if (!exception || !service) + goto out_nomem; + + sense = (struct tape_3590_sense *) irb->ecw; + /* Exception Message */ + switch (sense->fmt.f71.emc) { + case 0x01: + snprintf(exception, BUFSIZE, "Effect of failure is unknown"); + break; + case 0x02: + snprintf(exception, BUFSIZE, "CU Exception - no performance " + "impact"); + break; + case 0x03: + snprintf(exception, BUFSIZE, "CU Exception on channel " + "interface 0x%02x", sense->fmt.f71.md[0]); + break; + case 0x04: + snprintf(exception, BUFSIZE, "CU Exception on device path " + "0x%02x", sense->fmt.f71.md[0]); + break; + case 0x05: + snprintf(exception, BUFSIZE, "CU Exception on library path " + "0x%02x", sense->fmt.f71.md[0]); + break; + case 0x06: + snprintf(exception, BUFSIZE, "CU Exception on node 0x%02x", + sense->fmt.f71.md[0]); + break; + case 0x07: + snprintf(exception, BUFSIZE, "CU Exception on partition " + "0x%02x", sense->fmt.f71.md[0]); + break; + default: + snprintf(exception, BUFSIZE, "0x%02x", + sense->fmt.f71.emc); + } + /* Service Message */ + switch (sense->fmt.f71.smc) { + case 0x01: + snprintf(service, BUFSIZE, "Repair impact is unknown"); + break; + case 0x02: + snprintf(service, BUFSIZE, "Repair will not impact cu " + "performance"); + break; + case 0x03: + if (sense->fmt.f71.mdf == 0) + snprintf(service, BUFSIZE, "Repair will disable node " + "0x%x on CU", sense->fmt.f71.md[1]); + else + snprintf(service, BUFSIZE, "Repair will disable " + "nodes (0x%x-0x%x) on CU", sense->fmt.f71.md[1], + sense->fmt.f71.md[2]); + break; + case 0x04: + if (sense->fmt.f71.mdf == 0) + snprintf(service, BUFSIZE, "Repair will disable " + "channel path 0x%x on CU", + sense->fmt.f71.md[1]); + else + snprintf(service, BUFSIZE, "Repair will disable channel" + " paths (0x%x-0x%x) on CU", + sense->fmt.f71.md[1], sense->fmt.f71.md[2]); + break; + case 0x05: + if (sense->fmt.f71.mdf == 0) + snprintf(service, BUFSIZE, "Repair will disable device" + " path 0x%x on CU", sense->fmt.f71.md[1]); + else + snprintf(service, BUFSIZE, "Repair will disable device" + " paths (0x%x-0x%x) on CU", + sense->fmt.f71.md[1], sense->fmt.f71.md[2]); + break; + case 0x06: + if (sense->fmt.f71.mdf == 0) + snprintf(service, BUFSIZE, "Repair will disable " + "library path 0x%x on CU", + sense->fmt.f71.md[1]); + else + snprintf(service, BUFSIZE, "Repair will disable " + "library paths (0x%x-0x%x) on CU", + sense->fmt.f71.md[1], sense->fmt.f71.md[2]); + break; + case 0x07: + snprintf(service, BUFSIZE, "Repair will disable access to CU"); + break; + default: + snprintf(service, BUFSIZE, "0x%02x", + sense->fmt.f71.smc); + } + + dev_warn (&device->cdev->dev, "I/O subsystem information: exception" + " %s, service %s\n", exception, service); +out_nomem: + kfree(exception); + kfree(service); +} + +/* + * Print an Device Subsystem Service Information Message (message code f2) + */ +static void +tape_3590_print_dev_sim_msg_f2(struct tape_device *device, struct irb *irb) +{ + struct tape_3590_sense *sense; + char *exception, *service; + + exception = kmalloc(BUFSIZE, GFP_ATOMIC); + service = kmalloc(BUFSIZE, GFP_ATOMIC); + + if (!exception || !service) + goto out_nomem; + + sense = (struct tape_3590_sense *) irb->ecw; + /* Exception Message */ + switch (sense->fmt.f71.emc) { + case 0x01: + snprintf(exception, BUFSIZE, "Effect of failure is unknown"); + break; + case 0x02: + snprintf(exception, BUFSIZE, "DV Exception - no performance" + " impact"); + break; + case 0x03: + snprintf(exception, BUFSIZE, "DV Exception on channel " + "interface 0x%02x", sense->fmt.f71.md[0]); + break; + case 0x04: + snprintf(exception, BUFSIZE, "DV Exception on loader 0x%02x", + sense->fmt.f71.md[0]); + break; + case 0x05: + snprintf(exception, BUFSIZE, "DV Exception on message display" + " 0x%02x", sense->fmt.f71.md[0]); + break; + case 0x06: + snprintf(exception, BUFSIZE, "DV Exception in tape path"); + break; + case 0x07: + snprintf(exception, BUFSIZE, "DV Exception in drive"); + break; + default: + snprintf(exception, BUFSIZE, "0x%02x", + sense->fmt.f71.emc); + } + /* Service Message */ + switch (sense->fmt.f71.smc) { + case 0x01: + snprintf(service, BUFSIZE, "Repair impact is unknown"); + break; + case 0x02: + snprintf(service, BUFSIZE, "Repair will not impact device " + "performance"); + break; + case 0x03: + if (sense->fmt.f71.mdf == 0) + snprintf(service, BUFSIZE, "Repair will disable " + "channel path 0x%x on DV", + sense->fmt.f71.md[1]); + else + snprintf(service, BUFSIZE, "Repair will disable " + "channel path (0x%x-0x%x) on DV", + sense->fmt.f71.md[1], sense->fmt.f71.md[2]); + break; + case 0x04: + if (sense->fmt.f71.mdf == 0) + snprintf(service, BUFSIZE, "Repair will disable " + "interface 0x%x on DV", sense->fmt.f71.md[1]); + else + snprintf(service, BUFSIZE, "Repair will disable " + "interfaces (0x%x-0x%x) on DV", + sense->fmt.f71.md[1], sense->fmt.f71.md[2]); + break; + case 0x05: + if (sense->fmt.f71.mdf == 0) + snprintf(service, BUFSIZE, "Repair will disable loader" + " 0x%x on DV", sense->fmt.f71.md[1]); + else + snprintf(service, BUFSIZE, "Repair will disable loader" + " (0x%x-0x%x) on DV", + sense->fmt.f71.md[1], sense->fmt.f71.md[2]); + break; + case 0x07: + snprintf(service, BUFSIZE, "Repair will disable access to DV"); + break; + case 0x08: + if (sense->fmt.f71.mdf == 0) + snprintf(service, BUFSIZE, "Repair will disable " + "message display 0x%x on DV", + sense->fmt.f71.md[1]); + else + snprintf(service, BUFSIZE, "Repair will disable " + "message displays (0x%x-0x%x) on DV", + sense->fmt.f71.md[1], sense->fmt.f71.md[2]); + break; + case 0x09: + snprintf(service, BUFSIZE, "Clean DV"); + break; + default: + snprintf(service, BUFSIZE, "0x%02x", + sense->fmt.f71.smc); + } + + dev_warn (&device->cdev->dev, "Device subsystem information: exception" + " %s, service %s\n", exception, service); +out_nomem: + kfree(exception); + kfree(service); +} + +/* + * Print standard ERA Message + */ +static void +tape_3590_print_era_msg(struct tape_device *device, struct irb *irb) +{ + struct tape_3590_sense *sense; + + sense = (struct tape_3590_sense *) irb->ecw; + if (sense->mc == 0) + return; + if ((sense->mc > 0) && (sense->mc < TAPE_3590_MAX_MSG)) { + if (tape_3590_msg[sense->mc] != NULL) + dev_warn (&device->cdev->dev, "The tape unit has " + "issued sense message %s\n", + tape_3590_msg[sense->mc]); + else + dev_warn (&device->cdev->dev, "The tape unit has " + "issued an unknown sense message code 0x%x\n", + sense->mc); + return; + } + if (sense->mc == 0xf0) { + /* Standard Media Information Message */ + dev_warn (&device->cdev->dev, "MIM SEV=%i, MC=%02x, ES=%x/%x, " + "RC=%02x-%04x-%02x\n", sense->fmt.f70.sev, sense->mc, + sense->fmt.f70.emc, sense->fmt.f70.smc, + sense->fmt.f70.refcode, sense->fmt.f70.mid, + sense->fmt.f70.fid); + tape_3590_print_mim_msg_f0(device, irb); + return; + } + if (sense->mc == 0xf1) { + /* Standard I/O Subsystem Service Information Message */ + dev_warn (&device->cdev->dev, "IOSIM SEV=%i, DEVTYPE=3590/%02x," + " MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n", + sense->fmt.f71.sev, device->cdev->id.dev_model, + sense->mc, sense->fmt.f71.emc, sense->fmt.f71.smc, + sense->fmt.f71.refcode1, sense->fmt.f71.refcode2, + sense->fmt.f71.refcode3); + tape_3590_print_io_sim_msg_f1(device, irb); + return; + } + if (sense->mc == 0xf2) { + /* Standard Device Service Information Message */ + dev_warn (&device->cdev->dev, "DEVSIM SEV=%i, DEVTYPE=3590/%02x" + ", MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n", + sense->fmt.f71.sev, device->cdev->id.dev_model, + sense->mc, sense->fmt.f71.emc, sense->fmt.f71.smc, + sense->fmt.f71.refcode1, sense->fmt.f71.refcode2, + sense->fmt.f71.refcode3); + tape_3590_print_dev_sim_msg_f2(device, irb); + return; + } + if (sense->mc == 0xf3) { + /* Standard Library Service Information Message */ + return; + } + dev_warn (&device->cdev->dev, "The tape unit has issued an unknown " + "sense message code %x\n", sense->mc); +} + +static int tape_3590_crypt_error(struct tape_device *device, + struct tape_request *request, struct irb *irb) +{ + u8 cu_rc; + u16 ekm_rc2; + char *sense; + + sense = ((struct tape_3590_sense *) irb->ecw)->fmt.data; + cu_rc = sense[0]; + ekm_rc2 = *((u16*) &sense[10]); + if ((cu_rc == 0) && (ekm_rc2 == 0xee31)) + /* key not defined on EKM */ + return tape_3590_erp_basic(device, request, irb, -EKEYREJECTED); + if ((cu_rc == 1) || (cu_rc == 2)) + /* No connection to EKM */ + return tape_3590_erp_basic(device, request, irb, -ENOTCONN); + + dev_err (&device->cdev->dev, "The tape unit failed to obtain the " + "encryption key from EKM\n"); + + return tape_3590_erp_basic(device, request, irb, -ENOKEY); +} + +/* + * 3590 error Recovery routine: + * If possible, it tries to recover from the error. If this is not possible, + * inform the user about the problem. + */ +static int +tape_3590_unit_check(struct tape_device *device, struct tape_request *request, + struct irb *irb) +{ + struct tape_3590_sense *sense; + + sense = (struct tape_3590_sense *) irb->ecw; + + DBF_EVENT(6, "Unit Check: RQC = %x\n", sense->rc_rqc); + + /* + * First check all RC-QRCs where we want to do something special + * - "break": basic error recovery is done + * - "goto out:": just print error message if available + */ + switch (sense->rc_rqc) { + + case 0x1110: + tape_3590_print_era_msg(device, irb); + return tape_3590_erp_read_buf_log(device, request, irb); + + case 0x2011: + tape_3590_print_era_msg(device, irb); + return tape_3590_erp_read_alternate(device, request, irb); + + case 0x2230: + case 0x2231: + tape_3590_print_era_msg(device, irb); + return tape_3590_erp_special_interrupt(device, request, irb); + case 0x2240: + return tape_3590_crypt_error(device, request, irb); + + case 0x3010: + DBF_EVENT(2, "(%08x): Backward at Beginning of Partition\n", + device->cdev_id); + return tape_3590_erp_basic(device, request, irb, -ENOSPC); + case 0x3012: + DBF_EVENT(2, "(%08x): Forward at End of Partition\n", + device->cdev_id); + return tape_3590_erp_basic(device, request, irb, -ENOSPC); + case 0x3020: + DBF_EVENT(2, "(%08x): End of Data Mark\n", device->cdev_id); + return tape_3590_erp_basic(device, request, irb, -ENOSPC); + + case 0x3122: + DBF_EVENT(2, "(%08x): Rewind Unload initiated\n", + device->cdev_id); + return tape_3590_erp_basic(device, request, irb, -EIO); + case 0x3123: + DBF_EVENT(2, "(%08x): Rewind Unload complete\n", + device->cdev_id); + tape_med_state_set(device, MS_UNLOADED); + tape_3590_schedule_work(device, TO_CRYPT_OFF); + return tape_3590_erp_basic(device, request, irb, 0); + + case 0x4010: + /* + * print additional msg since default msg + * "device intervention" is not very meaningfull + */ + tape_med_state_set(device, MS_UNLOADED); + tape_3590_schedule_work(device, TO_CRYPT_OFF); + return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM); + case 0x4012: /* Device Long Busy */ + /* XXX: Also use long busy handling here? */ + DBF_EVENT(6, "(%08x): LONG BUSY\n", device->cdev_id); + tape_3590_print_era_msg(device, irb); + return tape_3590_erp_basic(device, request, irb, -EBUSY); + case 0x4014: + DBF_EVENT(6, "(%08x): Crypto LONG BUSY\n", device->cdev_id); + return tape_3590_erp_long_busy(device, request, irb); + + case 0x5010: + if (sense->rac == 0xd0) { + /* Swap */ + tape_3590_print_era_msg(device, irb); + return tape_3590_erp_swap(device, request, irb); + } + if (sense->rac == 0x26) { + /* Read Opposite */ + tape_3590_print_era_msg(device, irb); + return tape_3590_erp_read_opposite(device, request, + irb); + } + return tape_3590_erp_basic(device, request, irb, -EIO); + case 0x5020: + case 0x5021: + case 0x5022: + case 0x5040: + case 0x5041: + case 0x5042: + tape_3590_print_era_msg(device, irb); + return tape_3590_erp_swap(device, request, irb); + + case 0x5110: + case 0x5111: + return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE); + + case 0x5120: + case 0x1120: + tape_med_state_set(device, MS_UNLOADED); + tape_3590_schedule_work(device, TO_CRYPT_OFF); + return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM); + + case 0x6020: + return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE); + + case 0x8011: + return tape_3590_erp_basic(device, request, irb, -EPERM); + case 0x8013: + dev_warn (&device->cdev->dev, "A different host has privileged" + " access to the tape unit\n"); + return tape_3590_erp_basic(device, request, irb, -EPERM); + default: + return tape_3590_erp_basic(device, request, irb, -EIO); + } +} + +/* + * 3590 interrupt handler: + */ +static int +tape_3590_irq(struct tape_device *device, struct tape_request *request, + struct irb *irb) +{ + if (request == NULL) + return tape_3590_unsolicited_irq(device, irb); + + if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) && + (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) && + (request->op == TO_WRI)) { + /* Write at end of volume */ + DBF_EVENT(2, "End of volume\n"); + return tape_3590_erp_failed(device, request, irb, -ENOSPC); + } + + if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) + return tape_3590_unit_check(device, request, irb); + + if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) { + if (irb->scsw.cmd.dstat == DEV_STAT_UNIT_EXCEP) { + if (request->op == TO_FSB || request->op == TO_BSB) + request->rescnt++; + else + DBF_EVENT(5, "Unit Exception!\n"); + } + + return tape_3590_done(device, request); + } + + if (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) { + DBF_EVENT(2, "channel end\n"); + return TAPE_IO_PENDING; + } + + if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { + DBF_EVENT(2, "Unit Attention when busy..\n"); + return TAPE_IO_PENDING; + } + + DBF_EVENT(6, "xunknownirq\n"); + tape_dump_sense_dbf(device, request, irb); + return TAPE_IO_STOP; +} + + +static int tape_3590_read_dev_chars(struct tape_device *device, + struct tape_3590_rdc_data *rdc_data) +{ + int rc; + struct tape_request *request; + + request = tape_alloc_request(1, sizeof(*rdc_data)); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_RDC; + tape_ccw_end(request->cpaddr, CCW_CMD_RDC, sizeof(*rdc_data), + request->cpdata); + rc = tape_do_io(device, request); + if (rc == 0) + memcpy(rdc_data, request->cpdata, sizeof(*rdc_data)); + tape_free_request(request); + return rc; +} + +/* + * Setup device function + */ +static int +tape_3590_setup_device(struct tape_device *device) +{ + int rc; + struct tape_3590_disc_data *data; + struct tape_3590_rdc_data *rdc_data; + + DBF_EVENT(6, "3590 device setup\n"); + data = kzalloc(sizeof(struct tape_3590_disc_data), GFP_KERNEL | GFP_DMA); + if (data == NULL) + return -ENOMEM; + data->read_back_op = READ_PREVIOUS; + device->discdata = data; + + rdc_data = kmalloc(sizeof(*rdc_data), GFP_KERNEL | GFP_DMA); + if (!rdc_data) { + rc = -ENOMEM; + goto fail_kmalloc; + } + rc = tape_3590_read_dev_chars(device, rdc_data); + if (rc) { + DBF_LH(3, "Read device characteristics failed!\n"); + goto fail_rdc_data; + } + rc = tape_std_assign(device); + if (rc) + goto fail_rdc_data; + if (rdc_data->data[31] == 0x13) { + data->crypt_info.capability |= TAPE390_CRYPT_SUPPORTED_MASK; + tape_3592_disable_crypt(device); + } else { + DBF_EVENT(6, "Device has NO crypto support\n"); + } + /* Try to find out if medium is loaded */ + rc = tape_3590_sense_medium(device); + if (rc) { + DBF_LH(3, "3590 medium sense returned %d\n", rc); + goto fail_rdc_data; + } + return 0; + +fail_rdc_data: + kfree(rdc_data); +fail_kmalloc: + kfree(data); + return rc; +} + +/* + * Cleanup device function + */ +static void +tape_3590_cleanup_device(struct tape_device *device) +{ + flush_workqueue(tape_3590_wq); + tape_std_unassign(device); + + kfree(device->discdata); + device->discdata = NULL; +} + +/* + * List of 3590 magnetic tape commands. + */ +static tape_mtop_fn tape_3590_mtop[TAPE_NR_MTOPS] = { + [MTRESET] = tape_std_mtreset, + [MTFSF] = tape_std_mtfsf, + [MTBSF] = tape_std_mtbsf, + [MTFSR] = tape_std_mtfsr, + [MTBSR] = tape_std_mtbsr, + [MTWEOF] = tape_std_mtweof, + [MTREW] = tape_std_mtrew, + [MTOFFL] = tape_std_mtoffl, + [MTNOP] = tape_std_mtnop, + [MTRETEN] = tape_std_mtreten, + [MTBSFM] = tape_std_mtbsfm, + [MTFSFM] = tape_std_mtfsfm, + [MTEOM] = tape_std_mteom, + [MTERASE] = tape_std_mterase, + [MTRAS1] = NULL, + [MTRAS2] = NULL, + [MTRAS3] = NULL, + [MTSETBLK] = tape_std_mtsetblk, + [MTSETDENSITY] = NULL, + [MTSEEK] = tape_3590_mtseek, + [MTTELL] = tape_3590_mttell, + [MTSETDRVBUFFER] = NULL, + [MTFSS] = NULL, + [MTBSS] = NULL, + [MTWSM] = NULL, + [MTLOCK] = NULL, + [MTUNLOCK] = NULL, + [MTLOAD] = tape_std_mtload, + [MTUNLOAD] = tape_std_mtunload, + [MTCOMPRESSION] = tape_std_mtcompression, + [MTSETPART] = NULL, + [MTMKPART] = NULL +}; + +/* + * Tape discipline structure for 3590. + */ +static struct tape_discipline tape_discipline_3590 = { + .owner = THIS_MODULE, + .setup_device = tape_3590_setup_device, + .cleanup_device = tape_3590_cleanup_device, + .process_eov = tape_std_process_eov, + .irq = tape_3590_irq, + .read_block = tape_std_read_block, + .write_block = tape_std_write_block, + .ioctl_fn = tape_3590_ioctl, + .mtop_array = tape_3590_mtop +}; + +static struct ccw_device_id tape_3590_ids[] = { + {CCW_DEVICE_DEVTYPE(0x3590, 0, 0x3590, 0), .driver_info = tape_3590}, + {CCW_DEVICE_DEVTYPE(0x3592, 0, 0x3592, 0), .driver_info = tape_3592}, + { /* end of list */ } +}; + +static int +tape_3590_online(struct ccw_device *cdev) +{ + return tape_generic_online(dev_get_drvdata(&cdev->dev), + &tape_discipline_3590); +} + +static struct ccw_driver tape_3590_driver = { + .driver = { + .name = "tape_3590", + .owner = THIS_MODULE, + }, + .ids = tape_3590_ids, + .probe = tape_generic_probe, + .remove = tape_generic_remove, + .set_offline = tape_generic_offline, + .set_online = tape_3590_online, + .freeze = tape_generic_pm_suspend, + .int_class = IRQIO_TAP, +}; + +/* + * Setup discipline structure. + */ +static int +tape_3590_init(void) +{ + int rc; + + TAPE_DBF_AREA = debug_register("tape_3590", 2, 2, 4 * sizeof(long)); + debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); +#ifdef DBF_LIKE_HELL + debug_set_level(TAPE_DBF_AREA, 6); +#endif + + DBF_EVENT(3, "3590 init\n"); + + tape_3590_wq = alloc_workqueue("tape_3590", 0, 0); + if (!tape_3590_wq) + return -ENOMEM; + + /* Register driver for 3590 tapes. */ + rc = ccw_driver_register(&tape_3590_driver); + if (rc) { + destroy_workqueue(tape_3590_wq); + DBF_EVENT(3, "3590 init failed\n"); + } else + DBF_EVENT(3, "3590 registered\n"); + return rc; +} + +static void +tape_3590_exit(void) +{ + ccw_driver_unregister(&tape_3590_driver); + destroy_workqueue(tape_3590_wq); + debug_unregister(TAPE_DBF_AREA); +} + +MODULE_DEVICE_TABLE(ccw, tape_3590_ids); +MODULE_AUTHOR("(C) 2001,2006 IBM Corporation"); +MODULE_DESCRIPTION("Linux on zSeries channel attached 3590 tape device driver"); +MODULE_LICENSE("GPL"); + +module_init(tape_3590_init); +module_exit(tape_3590_exit); diff --git a/drivers/s390/char/tape_3590.h b/drivers/s390/char/tape_3590.h new file mode 100644 index 000000000..b398d8a3e --- /dev/null +++ b/drivers/s390/char/tape_3590.h @@ -0,0 +1,175 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * tape device discipline for 3590 tapes. + * + * Copyright IBM Corp. 2001, 2006 + * Author(s): Stefan Bader + * Michael Holzheu + * Martin Schwidefsky + */ + +#ifndef _TAPE_3590_H +#define _TAPE_3590_H + +#define MEDIUM_SENSE 0xc2 +#define READ_PREVIOUS 0x0a +#define MODE_SENSE 0xcf +#define PERFORM_SS_FUNC 0x77 +#define READ_SS_DATA 0x3e + +#define PREP_RD_SS_DATA 0x18 +#define RD_ATTMSG 0x3 + +#define SENSE_BRA_PER 0 +#define SENSE_BRA_CONT 1 +#define SENSE_BRA_RE 2 +#define SENSE_BRA_DRE 3 + +#define SENSE_FMT_LIBRARY 0x23 +#define SENSE_FMT_UNSOLICITED 0x40 +#define SENSE_FMT_COMMAND_REJ 0x41 +#define SENSE_FMT_COMMAND_EXEC0 0x50 +#define SENSE_FMT_COMMAND_EXEC1 0x51 +#define SENSE_FMT_EVENT0 0x60 +#define SENSE_FMT_EVENT1 0x61 +#define SENSE_FMT_MIM 0x70 +#define SENSE_FMT_SIM 0x71 + +#define MSENSE_UNASSOCIATED 0x00 +#define MSENSE_ASSOCIATED_MOUNT 0x01 +#define MSENSE_ASSOCIATED_UMOUNT 0x02 +#define MSENSE_CRYPT_MASK 0x00000010 + +#define TAPE_3590_MAX_MSG 0xb0 + +/* Datatypes */ + +struct tape_3590_disc_data { + struct tape390_crypt_info crypt_info; + int read_back_op; +}; + +#define TAPE_3590_CRYPT_INFO(device) \ + ((struct tape_3590_disc_data*)(device->discdata))->crypt_info +#define TAPE_3590_READ_BACK_OP(device) \ + ((struct tape_3590_disc_data*)(device->discdata))->read_back_op + +struct tape_3590_sense { + + unsigned int command_rej:1; + unsigned int interv_req:1; + unsigned int bus_out_check:1; + unsigned int eq_check:1; + unsigned int data_check:1; + unsigned int overrun:1; + unsigned int def_unit_check:1; + unsigned int assgnd_elsew:1; + + unsigned int locate_fail:1; + unsigned int inst_online:1; + unsigned int reserved:1; + unsigned int blk_seq_err:1; + unsigned int begin_part:1; + unsigned int wr_mode:1; + unsigned int wr_prot:1; + unsigned int not_cap:1; + + unsigned int bra:2; + unsigned int lc:3; + unsigned int vlf_active:1; + unsigned int stm:1; + unsigned int med_pos:1; + + unsigned int rac:8; + + unsigned int rc_rqc:16; + + unsigned int mc:8; + + unsigned int sense_fmt:8; + + union { + struct { + unsigned int emc:4; + unsigned int smc:4; + unsigned int sev:2; + unsigned int reserved:6; + unsigned int md:8; + unsigned int refcode:8; + unsigned int mid:16; + unsigned int mp:16; + unsigned char volid[6]; + unsigned int fid:8; + } f70; + struct { + unsigned int emc:4; + unsigned int smc:4; + unsigned int sev:2; + unsigned int reserved1:5; + unsigned int mdf:1; + unsigned char md[3]; + unsigned int simid:8; + unsigned int uid:16; + unsigned int refcode1:16; + unsigned int refcode2:16; + unsigned int refcode3:16; + unsigned int reserved2:8; + } f71; + unsigned char data[14]; + } fmt; + unsigned char pad[10]; + +} __attribute__ ((packed)); + +struct tape_3590_med_sense { + unsigned int macst:4; + unsigned int masst:4; + char pad1[7]; + unsigned int flags; + char pad2[116]; +} __attribute__ ((packed)); + +struct tape_3590_rdc_data { + char data[64]; +} __attribute__ ((packed)); + +/* Datastructures for 3592 encryption support */ + +struct tape3592_kekl { + __u8 flags; + char label[64]; +} __attribute__ ((packed)); + +struct tape3592_kekl_pair { + __u8 count; + struct tape3592_kekl kekl[2]; +} __attribute__ ((packed)); + +struct tape3592_kekl_query_data { + __u16 len; + __u8 fmt; + __u8 mc; + __u32 id; + __u8 flags; + struct tape3592_kekl_pair kekls; + char reserved[116]; +} __attribute__ ((packed)); + +struct tape3592_kekl_query_order { + __u8 code; + __u8 flags; + char reserved1[2]; + __u8 max_count; + char reserved2[35]; +} __attribute__ ((packed)); + +struct tape3592_kekl_set_order { + __u8 code; + __u8 flags; + char reserved1[2]; + __u8 op; + struct tape3592_kekl_pair kekls; + char reserved2[120]; +} __attribute__ ((packed)); + +#endif /* _TAPE_3590_H */ diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c new file mode 100644 index 000000000..fc206c9d1 --- /dev/null +++ b/drivers/s390/char/tape_char.c @@ -0,0 +1,501 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * character device frontend for tape device driver + * + * S390 and zSeries version + * Copyright IBM Corp. 2001, 2006 + * Author(s): Carsten Otte + * Michael Holzheu + * Tuan Ngo-Anh + * Martin Schwidefsky + */ + +#define KMSG_COMPONENT "tape" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include + +#include + +#define TAPE_DBF_AREA tape_core_dbf + +#include "tape.h" +#include "tape_std.h" +#include "tape_class.h" + +#define TAPECHAR_MAJOR 0 /* get dynamic major */ + +/* + * file operation structure for tape character frontend + */ +static ssize_t tapechar_read(struct file *, char __user *, size_t, loff_t *); +static ssize_t tapechar_write(struct file *, const char __user *, size_t, loff_t *); +static int tapechar_open(struct inode *,struct file *); +static int tapechar_release(struct inode *,struct file *); +static long tapechar_ioctl(struct file *, unsigned int, unsigned long); +#ifdef CONFIG_COMPAT +static long tapechar_compat_ioctl(struct file *, unsigned int, unsigned long); +#endif + +static const struct file_operations tape_fops = +{ + .owner = THIS_MODULE, + .read = tapechar_read, + .write = tapechar_write, + .unlocked_ioctl = tapechar_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = tapechar_compat_ioctl, +#endif + .open = tapechar_open, + .release = tapechar_release, + .llseek = no_llseek, +}; + +static int tapechar_major = TAPECHAR_MAJOR; + +/* + * This function is called for every new tapedevice + */ +int +tapechar_setup_device(struct tape_device * device) +{ + char device_name[20]; + + sprintf(device_name, "ntibm%i", device->first_minor / 2); + device->nt = register_tape_dev( + &device->cdev->dev, + MKDEV(tapechar_major, device->first_minor), + &tape_fops, + device_name, + "non-rewinding" + ); + device_name[0] = 'r'; + device->rt = register_tape_dev( + &device->cdev->dev, + MKDEV(tapechar_major, device->first_minor + 1), + &tape_fops, + device_name, + "rewinding" + ); + + return 0; +} + +void +tapechar_cleanup_device(struct tape_device *device) +{ + unregister_tape_dev(&device->cdev->dev, device->rt); + device->rt = NULL; + unregister_tape_dev(&device->cdev->dev, device->nt); + device->nt = NULL; +} + +static int +tapechar_check_idalbuffer(struct tape_device *device, size_t block_size) +{ + struct idal_buffer *new; + + if (device->char_data.idal_buf != NULL && + device->char_data.idal_buf->size == block_size) + return 0; + + if (block_size > MAX_BLOCKSIZE) { + DBF_EVENT(3, "Invalid blocksize (%zd > %d)\n", + block_size, MAX_BLOCKSIZE); + return -EINVAL; + } + + /* The current idal buffer is not correct. Allocate a new one. */ + new = idal_buffer_alloc(block_size, 0); + if (IS_ERR(new)) + return -ENOMEM; + + if (device->char_data.idal_buf != NULL) + idal_buffer_free(device->char_data.idal_buf); + + device->char_data.idal_buf = new; + + return 0; +} + +/* + * Tape device read function + */ +static ssize_t +tapechar_read(struct file *filp, char __user *data, size_t count, loff_t *ppos) +{ + struct tape_device *device; + struct tape_request *request; + size_t block_size; + int rc; + + DBF_EVENT(6, "TCHAR:read\n"); + device = (struct tape_device *) filp->private_data; + + /* + * If the tape isn't terminated yet, do it now. And since we then + * are at the end of the tape there wouldn't be anything to read + * anyways. So we return immediately. + */ + if(device->required_tapemarks) { + return tape_std_terminate_write(device); + } + + /* Find out block size to use */ + if (device->char_data.block_size != 0) { + if (count < device->char_data.block_size) { + DBF_EVENT(3, "TCHAR:read smaller than block " + "size was requested\n"); + return -EINVAL; + } + block_size = device->char_data.block_size; + } else { + block_size = count; + } + + rc = tapechar_check_idalbuffer(device, block_size); + if (rc) + return rc; + + DBF_EVENT(6, "TCHAR:nbytes: %lx\n", block_size); + /* Let the discipline build the ccw chain. */ + request = device->discipline->read_block(device, block_size); + if (IS_ERR(request)) + return PTR_ERR(request); + /* Execute it. */ + rc = tape_do_io(device, request); + if (rc == 0) { + rc = block_size - request->rescnt; + DBF_EVENT(6, "TCHAR:rbytes: %x\n", rc); + /* Copy data from idal buffer to user space. */ + if (idal_buffer_to_user(device->char_data.idal_buf, + data, rc) != 0) + rc = -EFAULT; + } + tape_free_request(request); + return rc; +} + +/* + * Tape device write function + */ +static ssize_t +tapechar_write(struct file *filp, const char __user *data, size_t count, loff_t *ppos) +{ + struct tape_device *device; + struct tape_request *request; + size_t block_size; + size_t written; + int nblocks; + int i, rc; + + DBF_EVENT(6, "TCHAR:write\n"); + device = (struct tape_device *) filp->private_data; + /* Find out block size and number of blocks */ + if (device->char_data.block_size != 0) { + if (count < device->char_data.block_size) { + DBF_EVENT(3, "TCHAR:write smaller than block " + "size was requested\n"); + return -EINVAL; + } + block_size = device->char_data.block_size; + nblocks = count / block_size; + } else { + block_size = count; + nblocks = 1; + } + + rc = tapechar_check_idalbuffer(device, block_size); + if (rc) + return rc; + + DBF_EVENT(6,"TCHAR:nbytes: %lx\n", block_size); + DBF_EVENT(6, "TCHAR:nblocks: %x\n", nblocks); + /* Let the discipline build the ccw chain. */ + request = device->discipline->write_block(device, block_size); + if (IS_ERR(request)) + return PTR_ERR(request); + rc = 0; + written = 0; + for (i = 0; i < nblocks; i++) { + /* Copy data from user space to idal buffer. */ + if (idal_buffer_from_user(device->char_data.idal_buf, + data, block_size)) { + rc = -EFAULT; + break; + } + rc = tape_do_io(device, request); + if (rc) + break; + DBF_EVENT(6, "TCHAR:wbytes: %lx\n", + block_size - request->rescnt); + written += block_size - request->rescnt; + if (request->rescnt != 0) + break; + data += block_size; + } + tape_free_request(request); + if (rc == -ENOSPC) { + /* + * Ok, the device has no more space. It has NOT written + * the block. + */ + if (device->discipline->process_eov) + device->discipline->process_eov(device); + if (written > 0) + rc = 0; + + } + + /* + * After doing a write we always need two tapemarks to correctly + * terminate the tape (one to terminate the file, the second to + * flag the end of recorded data. + * Since process_eov positions the tape in front of the written + * tapemark it doesn't hurt to write two marks again. + */ + if (!rc) + device->required_tapemarks = 2; + + return rc ? rc : written; +} + +/* + * Character frontend tape device open function. + */ +static int +tapechar_open (struct inode *inode, struct file *filp) +{ + struct tape_device *device; + int minor, rc; + + DBF_EVENT(6, "TCHAR:open: %i:%i\n", + imajor(file_inode(filp)), + iminor(file_inode(filp))); + + if (imajor(file_inode(filp)) != tapechar_major) + return -ENODEV; + + minor = iminor(file_inode(filp)); + device = tape_find_device(minor / TAPE_MINORS_PER_DEV); + if (IS_ERR(device)) { + DBF_EVENT(3, "TCHAR:open: tape_find_device() failed\n"); + return PTR_ERR(device); + } + + rc = tape_open(device); + if (rc == 0) { + filp->private_data = device; + nonseekable_open(inode, filp); + } else + tape_put_device(device); + + return rc; +} + +/* + * Character frontend tape device release function. + */ + +static int +tapechar_release(struct inode *inode, struct file *filp) +{ + struct tape_device *device; + + DBF_EVENT(6, "TCHAR:release: %x\n", iminor(inode)); + device = (struct tape_device *) filp->private_data; + + /* + * If this is the rewinding tape minor then rewind. In that case we + * write all required tapemarks. Otherwise only one to terminate the + * file. + */ + if ((iminor(inode) & 1) != 0) { + if (device->required_tapemarks) + tape_std_terminate_write(device); + tape_mtop(device, MTREW, 1); + } else { + if (device->required_tapemarks > 1) { + if (tape_mtop(device, MTWEOF, 1) == 0) + device->required_tapemarks--; + } + } + + if (device->char_data.idal_buf != NULL) { + idal_buffer_free(device->char_data.idal_buf); + device->char_data.idal_buf = NULL; + } + tape_release(device); + filp->private_data = NULL; + tape_put_device(device); + + return 0; +} + +/* + * Tape device io controls. + */ +static int +__tapechar_ioctl(struct tape_device *device, + unsigned int no, unsigned long data) +{ + int rc; + + if (no == MTIOCTOP) { + struct mtop op; + + if (copy_from_user(&op, (char __user *) data, sizeof(op)) != 0) + return -EFAULT; + if (op.mt_count < 0) + return -EINVAL; + + /* + * Operations that change tape position should write final + * tapemarks. + */ + switch (op.mt_op) { + case MTFSF: + case MTBSF: + case MTFSR: + case MTBSR: + case MTREW: + case MTOFFL: + case MTEOM: + case MTRETEN: + case MTBSFM: + case MTFSFM: + case MTSEEK: + if (device->required_tapemarks) + tape_std_terminate_write(device); + default: + ; + } + rc = tape_mtop(device, op.mt_op, op.mt_count); + + if (op.mt_op == MTWEOF && rc == 0) { + if (op.mt_count > device->required_tapemarks) + device->required_tapemarks = 0; + else + device->required_tapemarks -= op.mt_count; + } + return rc; + } + if (no == MTIOCPOS) { + /* MTIOCPOS: query the tape position. */ + struct mtpos pos; + + rc = tape_mtop(device, MTTELL, 1); + if (rc < 0) + return rc; + pos.mt_blkno = rc; + if (copy_to_user((char __user *) data, &pos, sizeof(pos)) != 0) + return -EFAULT; + return 0; + } + if (no == MTIOCGET) { + /* MTIOCGET: query the tape drive status. */ + struct mtget get; + + memset(&get, 0, sizeof(get)); + get.mt_type = MT_ISUNKNOWN; + get.mt_resid = 0 /* device->devstat.rescnt */; + get.mt_dsreg = + ((device->char_data.block_size << MT_ST_BLKSIZE_SHIFT) + & MT_ST_BLKSIZE_MASK); + /* FIXME: mt_gstat, mt_erreg, mt_fileno */ + get.mt_gstat = 0; + get.mt_erreg = 0; + get.mt_fileno = 0; + get.mt_gstat = device->tape_generic_status; + + if (device->medium_state == MS_LOADED) { + rc = tape_mtop(device, MTTELL, 1); + + if (rc < 0) + return rc; + + if (rc == 0) + get.mt_gstat |= GMT_BOT(~0); + + get.mt_blkno = rc; + } + + if (copy_to_user((char __user *) data, &get, sizeof(get)) != 0) + return -EFAULT; + + return 0; + } + /* Try the discipline ioctl function. */ + if (device->discipline->ioctl_fn == NULL) + return -EINVAL; + return device->discipline->ioctl_fn(device, no, data); +} + +static long +tapechar_ioctl(struct file *filp, unsigned int no, unsigned long data) +{ + struct tape_device *device; + long rc; + + DBF_EVENT(6, "TCHAR:ioct\n"); + + device = (struct tape_device *) filp->private_data; + mutex_lock(&device->mutex); + rc = __tapechar_ioctl(device, no, data); + mutex_unlock(&device->mutex); + return rc; +} + +#ifdef CONFIG_COMPAT +static long +tapechar_compat_ioctl(struct file *filp, unsigned int no, unsigned long data) +{ + struct tape_device *device = filp->private_data; + int rval = -ENOIOCTLCMD; + unsigned long argp; + + /* The 'arg' argument of any ioctl function may only be used for + * pointers because of the compat pointer conversion. + * Consider this when adding new ioctls. + */ + argp = (unsigned long) compat_ptr(data); + if (device->discipline->ioctl_fn) { + mutex_lock(&device->mutex); + rval = device->discipline->ioctl_fn(device, no, argp); + mutex_unlock(&device->mutex); + if (rval == -EINVAL) + rval = -ENOIOCTLCMD; + } + + return rval; +} +#endif /* CONFIG_COMPAT */ + +/* + * Initialize character device frontend. + */ +int +tapechar_init (void) +{ + dev_t dev; + + if (alloc_chrdev_region(&dev, 0, 256, "tape") != 0) + return -1; + + tapechar_major = MAJOR(dev); + + return 0; +} + +/* + * cleanup + */ +void +tapechar_exit(void) +{ + unregister_chrdev_region(MKDEV(tapechar_major, 0), 256); +} diff --git a/drivers/s390/char/tape_class.c b/drivers/s390/char/tape_class.c new file mode 100644 index 000000000..b58df0dd0 --- /dev/null +++ b/drivers/s390/char/tape_class.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2004 + * + * Tape class device support + * + * Author: Stefan Bader + * Based on simple class device code by Greg K-H + */ + +#define KMSG_COMPONENT "tape" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include + +#include "tape_class.h" + +MODULE_AUTHOR("Stefan Bader "); +MODULE_DESCRIPTION( + "Copyright IBM Corp. 2004 All Rights Reserved.\n" + "tape_class.c" +); +MODULE_LICENSE("GPL"); + +static struct class *tape_class; + +/* + * Register a tape device and return a pointer to the cdev structure. + * + * device + * The pointer to the struct device of the physical (base) device. + * drivername + * The pointer to the drivers name for it's character devices. + * dev + * The intended major/minor number. The major number may be 0 to + * get a dynamic major number. + * fops + * The pointer to the drivers file operations for the tape device. + * devname + * The pointer to the name of the character device. + */ +struct tape_class_device *register_tape_dev( + struct device * device, + dev_t dev, + const struct file_operations *fops, + char * device_name, + char * mode_name) +{ + struct tape_class_device * tcd; + int rc; + char * s; + + tcd = kzalloc(sizeof(struct tape_class_device), GFP_KERNEL); + if (!tcd) + return ERR_PTR(-ENOMEM); + + strlcpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN); + for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/')) + *s = '!'; + strlcpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN); + for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/')) + *s = '!'; + + tcd->char_device = cdev_alloc(); + if (!tcd->char_device) { + rc = -ENOMEM; + goto fail_with_tcd; + } + + tcd->char_device->owner = fops->owner; + tcd->char_device->ops = fops; + + rc = cdev_add(tcd->char_device, dev, 1); + if (rc) + goto fail_with_cdev; + + tcd->class_device = device_create(tape_class, device, + tcd->char_device->dev, NULL, + "%s", tcd->device_name); + rc = PTR_ERR_OR_ZERO(tcd->class_device); + if (rc) + goto fail_with_cdev; + rc = sysfs_create_link( + &device->kobj, + &tcd->class_device->kobj, + tcd->mode_name + ); + if (rc) + goto fail_with_class_device; + + return tcd; + +fail_with_class_device: + device_destroy(tape_class, tcd->char_device->dev); + +fail_with_cdev: + cdev_del(tcd->char_device); + +fail_with_tcd: + kfree(tcd); + + return ERR_PTR(rc); +} +EXPORT_SYMBOL(register_tape_dev); + +void unregister_tape_dev(struct device *device, struct tape_class_device *tcd) +{ + if (tcd != NULL && !IS_ERR(tcd)) { + sysfs_remove_link(&device->kobj, tcd->mode_name); + device_destroy(tape_class, tcd->char_device->dev); + cdev_del(tcd->char_device); + kfree(tcd); + } +} +EXPORT_SYMBOL(unregister_tape_dev); + + +static int __init tape_init(void) +{ + tape_class = class_create(THIS_MODULE, "tape390"); + + return 0; +} + +static void __exit tape_exit(void) +{ + class_destroy(tape_class); + tape_class = NULL; +} + +postcore_initcall(tape_init); +module_exit(tape_exit); diff --git a/drivers/s390/char/tape_class.h b/drivers/s390/char/tape_class.h new file mode 100644 index 000000000..d25ac075b --- /dev/null +++ b/drivers/s390/char/tape_class.h @@ -0,0 +1,59 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2004 All Rights Reserved. + * + * Tape class device support + * + * Author: Stefan Bader + * Based on simple class device code by Greg K-H + */ +#ifndef __TAPE_CLASS_H__ +#define __TAPE_CLASS_H__ + +#include +#include +#include +#include +#include + +#include +#include + +#define TAPECLASS_NAME_LEN 32 + +struct tape_class_device { + struct cdev *char_device; + struct device *class_device; + char device_name[TAPECLASS_NAME_LEN]; + char mode_name[TAPECLASS_NAME_LEN]; +}; + +/* + * Register a tape device and return a pointer to the tape class device + * created by the call. + * + * device + * The pointer to the struct device of the physical (base) device. + * dev + * The intended major/minor number. The major number may be 0 to + * get a dynamic major number. + * fops + * The pointer to the drivers file operations for the tape device. + * device_name + * Pointer to the logical device name (will also be used as kobject name + * of the cdev). This can also be called the name of the tape class + * device. + * mode_name + * Points to the name of the tape mode. This creates a link with that + * name from the physical device to the logical device (class). + */ +struct tape_class_device *register_tape_dev( + struct device * device, + dev_t dev, + const struct file_operations *fops, + char * device_name, + char * node_name +); +void unregister_tape_dev(struct device *device, struct tape_class_device *tcd); + +#endif /* __TAPE_CLASS_H__ */ diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c new file mode 100644 index 000000000..8d3370da2 --- /dev/null +++ b/drivers/s390/char/tape_core.c @@ -0,0 +1,1374 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * basic function of the tape device driver + * + * S390 and zSeries version + * Copyright IBM Corp. 2001, 2009 + * Author(s): Carsten Otte + * Michael Holzheu + * Tuan Ngo-Anh + * Martin Schwidefsky + * Stefan Bader + */ + +#define KMSG_COMPONENT "tape" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include // for kernel parameters +#include // for requesting modules +#include // for locks +#include +#include +#include + +#include // for variable types + +#define TAPE_DBF_AREA tape_core_dbf + +#include "tape.h" +#include "tape_std.h" + +#define LONG_BUSY_TIMEOUT 180 /* seconds */ + +static void __tape_do_irq (struct ccw_device *, unsigned long, struct irb *); +static void tape_delayed_next_request(struct work_struct *); +static void tape_long_busy_timeout(struct timer_list *t); + +/* + * One list to contain all tape devices of all disciplines, so + * we can assign the devices to minor numbers of the same major + * The list is protected by the rwlock + */ +static LIST_HEAD(tape_device_list); +static DEFINE_RWLOCK(tape_device_lock); + +/* + * Pointer to debug area. + */ +debug_info_t *TAPE_DBF_AREA = NULL; +EXPORT_SYMBOL(TAPE_DBF_AREA); + +/* + * Printable strings for tape enumerations. + */ +const char *tape_state_verbose[TS_SIZE] = +{ + [TS_UNUSED] = "UNUSED", + [TS_IN_USE] = "IN_USE", + [TS_BLKUSE] = "BLKUSE", + [TS_INIT] = "INIT ", + [TS_NOT_OPER] = "NOT_OP" +}; + +const char *tape_op_verbose[TO_SIZE] = +{ + [TO_BLOCK] = "BLK", [TO_BSB] = "BSB", + [TO_BSF] = "BSF", [TO_DSE] = "DSE", + [TO_FSB] = "FSB", [TO_FSF] = "FSF", + [TO_LBL] = "LBL", [TO_NOP] = "NOP", + [TO_RBA] = "RBA", [TO_RBI] = "RBI", + [TO_RFO] = "RFO", [TO_REW] = "REW", + [TO_RUN] = "RUN", [TO_WRI] = "WRI", + [TO_WTM] = "WTM", [TO_MSEN] = "MSN", + [TO_LOAD] = "LOA", [TO_READ_CONFIG] = "RCF", + [TO_READ_ATTMSG] = "RAT", + [TO_DIS] = "DIS", [TO_ASSIGN] = "ASS", + [TO_UNASSIGN] = "UAS", [TO_CRYPT_ON] = "CON", + [TO_CRYPT_OFF] = "COF", [TO_KEKL_SET] = "KLS", + [TO_KEKL_QUERY] = "KLQ",[TO_RDC] = "RDC", +}; + +static int devid_to_int(struct ccw_dev_id *dev_id) +{ + return dev_id->devno + (dev_id->ssid << 16); +} + +/* + * Some channel attached tape specific attributes. + * + * FIXME: In the future the first_minor and blocksize attribute should be + * replaced by a link to the cdev tree. + */ +static ssize_t +tape_medium_state_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct tape_device *tdev; + + tdev = dev_get_drvdata(dev); + return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->medium_state); +} + +static +DEVICE_ATTR(medium_state, 0444, tape_medium_state_show, NULL); + +static ssize_t +tape_first_minor_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct tape_device *tdev; + + tdev = dev_get_drvdata(dev); + return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->first_minor); +} + +static +DEVICE_ATTR(first_minor, 0444, tape_first_minor_show, NULL); + +static ssize_t +tape_state_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct tape_device *tdev; + + tdev = dev_get_drvdata(dev); + return scnprintf(buf, PAGE_SIZE, "%s\n", (tdev->first_minor < 0) ? + "OFFLINE" : tape_state_verbose[tdev->tape_state]); +} + +static +DEVICE_ATTR(state, 0444, tape_state_show, NULL); + +static ssize_t +tape_operation_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct tape_device *tdev; + ssize_t rc; + + tdev = dev_get_drvdata(dev); + if (tdev->first_minor < 0) + return scnprintf(buf, PAGE_SIZE, "N/A\n"); + + spin_lock_irq(get_ccwdev_lock(tdev->cdev)); + if (list_empty(&tdev->req_queue)) + rc = scnprintf(buf, PAGE_SIZE, "---\n"); + else { + struct tape_request *req; + + req = list_entry(tdev->req_queue.next, struct tape_request, + list); + rc = scnprintf(buf,PAGE_SIZE, "%s\n", tape_op_verbose[req->op]); + } + spin_unlock_irq(get_ccwdev_lock(tdev->cdev)); + return rc; +} + +static +DEVICE_ATTR(operation, 0444, tape_operation_show, NULL); + +static ssize_t +tape_blocksize_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct tape_device *tdev; + + tdev = dev_get_drvdata(dev); + + return scnprintf(buf, PAGE_SIZE, "%i\n", tdev->char_data.block_size); +} + +static +DEVICE_ATTR(blocksize, 0444, tape_blocksize_show, NULL); + +static struct attribute *tape_attrs[] = { + &dev_attr_medium_state.attr, + &dev_attr_first_minor.attr, + &dev_attr_state.attr, + &dev_attr_operation.attr, + &dev_attr_blocksize.attr, + NULL +}; + +static const struct attribute_group tape_attr_group = { + .attrs = tape_attrs, +}; + +/* + * Tape state functions + */ +void +tape_state_set(struct tape_device *device, enum tape_state newstate) +{ + const char *str; + + if (device->tape_state == TS_NOT_OPER) { + DBF_EVENT(3, "ts_set err: not oper\n"); + return; + } + DBF_EVENT(4, "ts. dev: %x\n", device->first_minor); + DBF_EVENT(4, "old ts:\t\n"); + if (device->tape_state < TS_SIZE && device->tape_state >=0 ) + str = tape_state_verbose[device->tape_state]; + else + str = "UNKNOWN TS"; + DBF_EVENT(4, "%s\n", str); + DBF_EVENT(4, "new ts:\t\n"); + if (newstate < TS_SIZE && newstate >= 0) + str = tape_state_verbose[newstate]; + else + str = "UNKNOWN TS"; + DBF_EVENT(4, "%s\n", str); + device->tape_state = newstate; + wake_up(&device->state_change_wq); +} + +struct tape_med_state_work_data { + struct tape_device *device; + enum tape_medium_state state; + struct work_struct work; +}; + +static void +tape_med_state_work_handler(struct work_struct *work) +{ + static char env_state_loaded[] = "MEDIUM_STATE=LOADED"; + static char env_state_unloaded[] = "MEDIUM_STATE=UNLOADED"; + struct tape_med_state_work_data *p = + container_of(work, struct tape_med_state_work_data, work); + struct tape_device *device = p->device; + char *envp[] = { NULL, NULL }; + + switch (p->state) { + case MS_UNLOADED: + pr_info("%s: The tape cartridge has been successfully " + "unloaded\n", dev_name(&device->cdev->dev)); + envp[0] = env_state_unloaded; + kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp); + break; + case MS_LOADED: + pr_info("%s: A tape cartridge has been mounted\n", + dev_name(&device->cdev->dev)); + envp[0] = env_state_loaded; + kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp); + break; + default: + break; + } + tape_put_device(device); + kfree(p); +} + +static void +tape_med_state_work(struct tape_device *device, enum tape_medium_state state) +{ + struct tape_med_state_work_data *p; + + p = kzalloc(sizeof(*p), GFP_ATOMIC); + if (p) { + INIT_WORK(&p->work, tape_med_state_work_handler); + p->device = tape_get_device(device); + p->state = state; + schedule_work(&p->work); + } +} + +void +tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate) +{ + enum tape_medium_state oldstate; + + oldstate = device->medium_state; + if (oldstate == newstate) + return; + device->medium_state = newstate; + switch(newstate){ + case MS_UNLOADED: + device->tape_generic_status |= GMT_DR_OPEN(~0); + if (oldstate == MS_LOADED) + tape_med_state_work(device, MS_UNLOADED); + break; + case MS_LOADED: + device->tape_generic_status &= ~GMT_DR_OPEN(~0); + if (oldstate == MS_UNLOADED) + tape_med_state_work(device, MS_LOADED); + break; + default: + break; + } + wake_up(&device->state_change_wq); +} + +/* + * Stop running ccw. Has to be called with the device lock held. + */ +static int +__tape_cancel_io(struct tape_device *device, struct tape_request *request) +{ + int retries; + int rc; + + /* Check if interrupt has already been processed */ + if (request->callback == NULL) + return 0; + + rc = 0; + for (retries = 0; retries < 5; retries++) { + rc = ccw_device_clear(device->cdev, (long) request); + + switch (rc) { + case 0: + request->status = TAPE_REQUEST_DONE; + return 0; + case -EBUSY: + request->status = TAPE_REQUEST_CANCEL; + schedule_delayed_work(&device->tape_dnr, 0); + return 0; + case -ENODEV: + DBF_EXCEPTION(2, "device gone, retry\n"); + break; + case -EIO: + DBF_EXCEPTION(2, "I/O error, retry\n"); + break; + default: + BUG(); + } + } + + return rc; +} + +/* + * Add device into the sorted list, giving it the first + * available minor number. + */ +static int +tape_assign_minor(struct tape_device *device) +{ + struct tape_device *tmp; + int minor; + + minor = 0; + write_lock(&tape_device_lock); + list_for_each_entry(tmp, &tape_device_list, node) { + if (minor < tmp->first_minor) + break; + minor += TAPE_MINORS_PER_DEV; + } + if (minor >= 256) { + write_unlock(&tape_device_lock); + return -ENODEV; + } + device->first_minor = minor; + list_add_tail(&device->node, &tmp->node); + write_unlock(&tape_device_lock); + return 0; +} + +/* remove device from the list */ +static void +tape_remove_minor(struct tape_device *device) +{ + write_lock(&tape_device_lock); + list_del_init(&device->node); + device->first_minor = -1; + write_unlock(&tape_device_lock); +} + +/* + * Set a device online. + * + * This function is called by the common I/O layer to move a device from the + * detected but offline into the online state. + * If we return an error (RC < 0) the device remains in the offline state. This + * can happen if the device is assigned somewhere else, for example. + */ +int +tape_generic_online(struct tape_device *device, + struct tape_discipline *discipline) +{ + int rc; + + DBF_LH(6, "tape_enable_device(%p, %p)\n", device, discipline); + + if (device->tape_state != TS_INIT) { + DBF_LH(3, "Tapestate not INIT (%d)\n", device->tape_state); + return -EINVAL; + } + + timer_setup(&device->lb_timeout, tape_long_busy_timeout, 0); + + /* Let the discipline have a go at the device. */ + device->discipline = discipline; + if (!try_module_get(discipline->owner)) { + return -EINVAL; + } + + rc = discipline->setup_device(device); + if (rc) + goto out; + rc = tape_assign_minor(device); + if (rc) + goto out_discipline; + + rc = tapechar_setup_device(device); + if (rc) + goto out_minor; + + tape_state_set(device, TS_UNUSED); + + DBF_LH(3, "(%08x): Drive set online\n", device->cdev_id); + + return 0; + +out_minor: + tape_remove_minor(device); +out_discipline: + device->discipline->cleanup_device(device); + device->discipline = NULL; +out: + module_put(discipline->owner); + return rc; +} + +static void +tape_cleanup_device(struct tape_device *device) +{ + tapechar_cleanup_device(device); + device->discipline->cleanup_device(device); + module_put(device->discipline->owner); + tape_remove_minor(device); + tape_med_state_set(device, MS_UNKNOWN); +} + +/* + * Suspend device. + * + * Called by the common I/O layer if the drive should be suspended on user + * request. We refuse to suspend if the device is loaded or in use for the + * following reason: + * While the Linux guest is suspended, it might be logged off which causes + * devices to be detached. Tape devices are automatically rewound and unloaded + * during DETACH processing (unless the tape device was attached with the + * NOASSIGN or MULTIUSER option). After rewind/unload, there is no way to + * resume the original state of the tape device, since we would need to + * manually re-load the cartridge which was active at suspend time. + */ +int tape_generic_pm_suspend(struct ccw_device *cdev) +{ + struct tape_device *device; + + device = dev_get_drvdata(&cdev->dev); + if (!device) { + return -ENODEV; + } + + DBF_LH(3, "(%08x): tape_generic_pm_suspend(%p)\n", + device->cdev_id, device); + + if (device->medium_state != MS_UNLOADED) { + pr_err("A cartridge is loaded in tape device %s, " + "refusing to suspend\n", dev_name(&cdev->dev)); + return -EBUSY; + } + + spin_lock_irq(get_ccwdev_lock(device->cdev)); + switch (device->tape_state) { + case TS_INIT: + case TS_NOT_OPER: + case TS_UNUSED: + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + break; + default: + pr_err("Tape device %s is busy, refusing to " + "suspend\n", dev_name(&cdev->dev)); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + return -EBUSY; + } + + DBF_LH(3, "(%08x): Drive suspended.\n", device->cdev_id); + return 0; +} + +/* + * Set device offline. + * + * Called by the common I/O layer if the drive should set offline on user + * request. We may prevent this by returning an error. + * Manual offline is only allowed while the drive is not in use. + */ +int +tape_generic_offline(struct ccw_device *cdev) +{ + struct tape_device *device; + + device = dev_get_drvdata(&cdev->dev); + if (!device) { + return -ENODEV; + } + + DBF_LH(3, "(%08x): tape_generic_offline(%p)\n", + device->cdev_id, device); + + spin_lock_irq(get_ccwdev_lock(device->cdev)); + switch (device->tape_state) { + case TS_INIT: + case TS_NOT_OPER: + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + break; + case TS_UNUSED: + tape_state_set(device, TS_INIT); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + tape_cleanup_device(device); + break; + default: + DBF_EVENT(3, "(%08x): Set offline failed " + "- drive in use.\n", + device->cdev_id); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + return -EBUSY; + } + + DBF_LH(3, "(%08x): Drive set offline.\n", device->cdev_id); + return 0; +} + +/* + * Allocate memory for a new device structure. + */ +static struct tape_device * +tape_alloc_device(void) +{ + struct tape_device *device; + + device = kzalloc(sizeof(struct tape_device), GFP_KERNEL); + if (device == NULL) { + DBF_EXCEPTION(2, "ti:no mem\n"); + return ERR_PTR(-ENOMEM); + } + device->modeset_byte = kmalloc(1, GFP_KERNEL | GFP_DMA); + if (device->modeset_byte == NULL) { + DBF_EXCEPTION(2, "ti:no mem\n"); + kfree(device); + return ERR_PTR(-ENOMEM); + } + mutex_init(&device->mutex); + INIT_LIST_HEAD(&device->req_queue); + INIT_LIST_HEAD(&device->node); + init_waitqueue_head(&device->state_change_wq); + init_waitqueue_head(&device->wait_queue); + device->tape_state = TS_INIT; + device->medium_state = MS_UNKNOWN; + *device->modeset_byte = 0; + device->first_minor = -1; + atomic_set(&device->ref_count, 1); + INIT_DELAYED_WORK(&device->tape_dnr, tape_delayed_next_request); + + return device; +} + +/* + * Get a reference to an existing device structure. This will automatically + * increment the reference count. + */ +struct tape_device * +tape_get_device(struct tape_device *device) +{ + int count; + + count = atomic_inc_return(&device->ref_count); + DBF_EVENT(4, "tape_get_device(%p) = %i\n", device, count); + return device; +} + +/* + * Decrease the reference counter of a devices structure. If the + * reference counter reaches zero free the device structure. + * The function returns a NULL pointer to be used by the caller + * for clearing reference pointers. + */ +void +tape_put_device(struct tape_device *device) +{ + int count; + + count = atomic_dec_return(&device->ref_count); + DBF_EVENT(4, "tape_put_device(%p) -> %i\n", device, count); + BUG_ON(count < 0); + if (count == 0) { + kfree(device->modeset_byte); + kfree(device); + } +} + +/* + * Find tape device by a device index. + */ +struct tape_device * +tape_find_device(int devindex) +{ + struct tape_device *device, *tmp; + + device = ERR_PTR(-ENODEV); + read_lock(&tape_device_lock); + list_for_each_entry(tmp, &tape_device_list, node) { + if (tmp->first_minor / TAPE_MINORS_PER_DEV == devindex) { + device = tape_get_device(tmp); + break; + } + } + read_unlock(&tape_device_lock); + return device; +} + +/* + * Driverfs tape probe function. + */ +int +tape_generic_probe(struct ccw_device *cdev) +{ + struct tape_device *device; + int ret; + struct ccw_dev_id dev_id; + + device = tape_alloc_device(); + if (IS_ERR(device)) + return -ENODEV; + ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP | + CCWDEV_DO_MULTIPATH); + ret = sysfs_create_group(&cdev->dev.kobj, &tape_attr_group); + if (ret) { + tape_put_device(device); + return ret; + } + dev_set_drvdata(&cdev->dev, device); + cdev->handler = __tape_do_irq; + device->cdev = cdev; + ccw_device_get_id(cdev, &dev_id); + device->cdev_id = devid_to_int(&dev_id); + return ret; +} + +static void +__tape_discard_requests(struct tape_device *device) +{ + struct tape_request * request; + struct list_head * l, *n; + + list_for_each_safe(l, n, &device->req_queue) { + request = list_entry(l, struct tape_request, list); + if (request->status == TAPE_REQUEST_IN_IO) + request->status = TAPE_REQUEST_DONE; + list_del(&request->list); + + /* Decrease ref_count for removed request. */ + request->device = NULL; + tape_put_device(device); + request->rc = -EIO; + if (request->callback != NULL) + request->callback(request, request->callback_data); + } +} + +/* + * Driverfs tape remove function. + * + * This function is called whenever the common I/O layer detects the device + * gone. This can happen at any time and we cannot refuse. + */ +void +tape_generic_remove(struct ccw_device *cdev) +{ + struct tape_device * device; + + device = dev_get_drvdata(&cdev->dev); + if (!device) { + return; + } + DBF_LH(3, "(%08x): tape_generic_remove(%p)\n", device->cdev_id, cdev); + + spin_lock_irq(get_ccwdev_lock(device->cdev)); + switch (device->tape_state) { + case TS_INIT: + tape_state_set(device, TS_NOT_OPER); + case TS_NOT_OPER: + /* + * Nothing to do. + */ + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + break; + case TS_UNUSED: + /* + * Need only to release the device. + */ + tape_state_set(device, TS_NOT_OPER); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + tape_cleanup_device(device); + break; + default: + /* + * There may be requests on the queue. We will not get + * an interrupt for a request that was running. So we + * just post them all as I/O errors. + */ + DBF_EVENT(3, "(%08x): Drive in use vanished!\n", + device->cdev_id); + pr_warn("%s: A tape unit was detached while in use\n", + dev_name(&device->cdev->dev)); + tape_state_set(device, TS_NOT_OPER); + __tape_discard_requests(device); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + tape_cleanup_device(device); + } + + device = dev_get_drvdata(&cdev->dev); + if (device) { + sysfs_remove_group(&cdev->dev.kobj, &tape_attr_group); + dev_set_drvdata(&cdev->dev, NULL); + tape_put_device(device); + } +} + +/* + * Allocate a new tape ccw request + */ +struct tape_request * +tape_alloc_request(int cplength, int datasize) +{ + struct tape_request *request; + + BUG_ON(datasize > PAGE_SIZE || (cplength*sizeof(struct ccw1)) > PAGE_SIZE); + + DBF_LH(6, "tape_alloc_request(%d, %d)\n", cplength, datasize); + + request = kzalloc(sizeof(struct tape_request), GFP_KERNEL); + if (request == NULL) { + DBF_EXCEPTION(1, "cqra nomem\n"); + return ERR_PTR(-ENOMEM); + } + /* allocate channel program */ + if (cplength > 0) { + request->cpaddr = kcalloc(cplength, sizeof(struct ccw1), + GFP_ATOMIC | GFP_DMA); + if (request->cpaddr == NULL) { + DBF_EXCEPTION(1, "cqra nomem\n"); + kfree(request); + return ERR_PTR(-ENOMEM); + } + } + /* alloc small kernel buffer */ + if (datasize > 0) { + request->cpdata = kzalloc(datasize, GFP_KERNEL | GFP_DMA); + if (request->cpdata == NULL) { + DBF_EXCEPTION(1, "cqra nomem\n"); + kfree(request->cpaddr); + kfree(request); + return ERR_PTR(-ENOMEM); + } + } + DBF_LH(6, "New request %p(%p/%p)\n", request, request->cpaddr, + request->cpdata); + + return request; +} + +/* + * Free tape ccw request + */ +void +tape_free_request (struct tape_request * request) +{ + DBF_LH(6, "Free request %p\n", request); + + if (request->device) + tape_put_device(request->device); + kfree(request->cpdata); + kfree(request->cpaddr); + kfree(request); +} + +static int +__tape_start_io(struct tape_device *device, struct tape_request *request) +{ + int rc; + + rc = ccw_device_start( + device->cdev, + request->cpaddr, + (unsigned long) request, + 0x00, + request->options + ); + if (rc == 0) { + request->status = TAPE_REQUEST_IN_IO; + } else if (rc == -EBUSY) { + /* The common I/O subsystem is currently busy. Retry later. */ + request->status = TAPE_REQUEST_QUEUED; + schedule_delayed_work(&device->tape_dnr, 0); + rc = 0; + } else { + /* Start failed. Remove request and indicate failure. */ + DBF_EVENT(1, "tape: start request failed with RC = %i\n", rc); + } + return rc; +} + +static void +__tape_start_next_request(struct tape_device *device) +{ + struct list_head *l, *n; + struct tape_request *request; + int rc; + + DBF_LH(6, "__tape_start_next_request(%p)\n", device); + /* + * Try to start each request on request queue until one is + * started successful. + */ + list_for_each_safe(l, n, &device->req_queue) { + request = list_entry(l, struct tape_request, list); + + /* + * Avoid race condition if bottom-half was triggered more than + * once. + */ + if (request->status == TAPE_REQUEST_IN_IO) + return; + /* + * Request has already been stopped. We have to wait until + * the request is removed from the queue in the interrupt + * handling. + */ + if (request->status == TAPE_REQUEST_DONE) + return; + + /* + * We wanted to cancel the request but the common I/O layer + * was busy at that time. This can only happen if this + * function is called by delayed_next_request. + * Otherwise we start the next request on the queue. + */ + if (request->status == TAPE_REQUEST_CANCEL) { + rc = __tape_cancel_io(device, request); + } else { + rc = __tape_start_io(device, request); + } + if (rc == 0) + return; + + /* Set ending status. */ + request->rc = rc; + request->status = TAPE_REQUEST_DONE; + + /* Remove from request queue. */ + list_del(&request->list); + + /* Do callback. */ + if (request->callback != NULL) + request->callback(request, request->callback_data); + } +} + +static void +tape_delayed_next_request(struct work_struct *work) +{ + struct tape_device *device = + container_of(work, struct tape_device, tape_dnr.work); + + DBF_LH(6, "tape_delayed_next_request(%p)\n", device); + spin_lock_irq(get_ccwdev_lock(device->cdev)); + __tape_start_next_request(device); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); +} + +static void tape_long_busy_timeout(struct timer_list *t) +{ + struct tape_device *device = from_timer(device, t, lb_timeout); + struct tape_request *request; + + spin_lock_irq(get_ccwdev_lock(device->cdev)); + request = list_entry(device->req_queue.next, struct tape_request, list); + BUG_ON(request->status != TAPE_REQUEST_LONG_BUSY); + DBF_LH(6, "%08x: Long busy timeout.\n", device->cdev_id); + __tape_start_next_request(device); + tape_put_device(device); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); +} + +static void +__tape_end_request( + struct tape_device * device, + struct tape_request * request, + int rc) +{ + DBF_LH(6, "__tape_end_request(%p, %p, %i)\n", device, request, rc); + if (request) { + request->rc = rc; + request->status = TAPE_REQUEST_DONE; + + /* Remove from request queue. */ + list_del(&request->list); + + /* Do callback. */ + if (request->callback != NULL) + request->callback(request, request->callback_data); + } + + /* Start next request. */ + if (!list_empty(&device->req_queue)) + __tape_start_next_request(device); +} + +/* + * Write sense data to dbf + */ +void +tape_dump_sense_dbf(struct tape_device *device, struct tape_request *request, + struct irb *irb) +{ + unsigned int *sptr; + const char* op; + + if (request != NULL) + op = tape_op_verbose[request->op]; + else + op = "---"; + DBF_EVENT(3, "DSTAT : %02x CSTAT: %02x\n", + irb->scsw.cmd.dstat, irb->scsw.cmd.cstat); + DBF_EVENT(3, "DEVICE: %08x OP\t: %s\n", device->cdev_id, op); + sptr = (unsigned int *) irb->ecw; + DBF_EVENT(3, "%08x %08x\n", sptr[0], sptr[1]); + DBF_EVENT(3, "%08x %08x\n", sptr[2], sptr[3]); + DBF_EVENT(3, "%08x %08x\n", sptr[4], sptr[5]); + DBF_EVENT(3, "%08x %08x\n", sptr[6], sptr[7]); +} + +/* + * I/O helper function. Adds the request to the request queue + * and starts it if the tape is idle. Has to be called with + * the device lock held. + */ +static int +__tape_start_request(struct tape_device *device, struct tape_request *request) +{ + int rc; + + switch (request->op) { + case TO_MSEN: + case TO_ASSIGN: + case TO_UNASSIGN: + case TO_READ_ATTMSG: + case TO_RDC: + if (device->tape_state == TS_INIT) + break; + if (device->tape_state == TS_UNUSED) + break; + default: + if (device->tape_state == TS_BLKUSE) + break; + if (device->tape_state != TS_IN_USE) + return -ENODEV; + } + + /* Increase use count of device for the added request. */ + request->device = tape_get_device(device); + + if (list_empty(&device->req_queue)) { + /* No other requests are on the queue. Start this one. */ + rc = __tape_start_io(device, request); + if (rc) + return rc; + + DBF_LH(5, "Request %p added for execution.\n", request); + list_add(&request->list, &device->req_queue); + } else { + DBF_LH(5, "Request %p add to queue.\n", request); + request->status = TAPE_REQUEST_QUEUED; + list_add_tail(&request->list, &device->req_queue); + } + return 0; +} + +/* + * Add the request to the request queue, try to start it if the + * tape is idle. Return without waiting for end of i/o. + */ +int +tape_do_io_async(struct tape_device *device, struct tape_request *request) +{ + int rc; + + DBF_LH(6, "tape_do_io_async(%p, %p)\n", device, request); + + spin_lock_irq(get_ccwdev_lock(device->cdev)); + /* Add request to request queue and try to start it. */ + rc = __tape_start_request(device, request); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + return rc; +} + +/* + * tape_do_io/__tape_wake_up + * Add the request to the request queue, try to start it if the + * tape is idle and wait uninterruptible for its completion. + */ +static void +__tape_wake_up(struct tape_request *request, void *data) +{ + request->callback = NULL; + wake_up((wait_queue_head_t *) data); +} + +int +tape_do_io(struct tape_device *device, struct tape_request *request) +{ + int rc; + + spin_lock_irq(get_ccwdev_lock(device->cdev)); + /* Setup callback */ + request->callback = __tape_wake_up; + request->callback_data = &device->wait_queue; + /* Add request to request queue and try to start it. */ + rc = __tape_start_request(device, request); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + if (rc) + return rc; + /* Request added to the queue. Wait for its completion. */ + wait_event(device->wait_queue, (request->callback == NULL)); + /* Get rc from request */ + return request->rc; +} + +/* + * tape_do_io_interruptible/__tape_wake_up_interruptible + * Add the request to the request queue, try to start it if the + * tape is idle and wait uninterruptible for its completion. + */ +static void +__tape_wake_up_interruptible(struct tape_request *request, void *data) +{ + request->callback = NULL; + wake_up_interruptible((wait_queue_head_t *) data); +} + +int +tape_do_io_interruptible(struct tape_device *device, + struct tape_request *request) +{ + int rc; + + spin_lock_irq(get_ccwdev_lock(device->cdev)); + /* Setup callback */ + request->callback = __tape_wake_up_interruptible; + request->callback_data = &device->wait_queue; + rc = __tape_start_request(device, request); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + if (rc) + return rc; + /* Request added to the queue. Wait for its completion. */ + rc = wait_event_interruptible(device->wait_queue, + (request->callback == NULL)); + if (rc != -ERESTARTSYS) + /* Request finished normally. */ + return request->rc; + + /* Interrupted by a signal. We have to stop the current request. */ + spin_lock_irq(get_ccwdev_lock(device->cdev)); + rc = __tape_cancel_io(device, request); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + if (rc == 0) { + /* Wait for the interrupt that acknowledges the halt. */ + do { + rc = wait_event_interruptible( + device->wait_queue, + (request->callback == NULL) + ); + } while (rc == -ERESTARTSYS); + + DBF_EVENT(3, "IO stopped on %08x\n", device->cdev_id); + rc = -ERESTARTSYS; + } + return rc; +} + +/* + * Stop running ccw. + */ +int +tape_cancel_io(struct tape_device *device, struct tape_request *request) +{ + int rc; + + spin_lock_irq(get_ccwdev_lock(device->cdev)); + rc = __tape_cancel_io(device, request); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + return rc; +} + +/* + * Tape interrupt routine, called from the ccw_device layer + */ +static void +__tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) +{ + struct tape_device *device; + struct tape_request *request; + int rc; + + device = dev_get_drvdata(&cdev->dev); + if (device == NULL) { + return; + } + request = (struct tape_request *) intparm; + + DBF_LH(6, "__tape_do_irq(device=%p, request=%p)\n", device, request); + + /* On special conditions irb is an error pointer */ + if (IS_ERR(irb)) { + /* FIXME: What to do with the request? */ + switch (PTR_ERR(irb)) { + case -ETIMEDOUT: + DBF_LH(1, "(%08x): Request timed out\n", + device->cdev_id); + case -EIO: + __tape_end_request(device, request, -EIO); + break; + default: + DBF_LH(1, "(%08x): Unexpected i/o error %li\n", + device->cdev_id, PTR_ERR(irb)); + } + return; + } + + /* + * If the condition code is not zero and the start function bit is + * still set, this is an deferred error and the last start I/O did + * not succeed. At this point the condition that caused the deferred + * error might still apply. So we just schedule the request to be + * started later. + */ + if (irb->scsw.cmd.cc != 0 && + (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) && + (request->status == TAPE_REQUEST_IN_IO)) { + DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n", + device->cdev_id, irb->scsw.cmd.cc, irb->scsw.cmd.fctl); + request->status = TAPE_REQUEST_QUEUED; + schedule_delayed_work(&device->tape_dnr, HZ); + return; + } + + /* May be an unsolicited irq */ + if(request != NULL) + request->rescnt = irb->scsw.cmd.count; + else if ((irb->scsw.cmd.dstat == 0x85 || irb->scsw.cmd.dstat == 0x80) && + !list_empty(&device->req_queue)) { + /* Not Ready to Ready after long busy ? */ + struct tape_request *req; + req = list_entry(device->req_queue.next, + struct tape_request, list); + if (req->status == TAPE_REQUEST_LONG_BUSY) { + DBF_EVENT(3, "(%08x): del timer\n", device->cdev_id); + if (del_timer(&device->lb_timeout)) { + tape_put_device(device); + __tape_start_next_request(device); + } + return; + } + } + if (irb->scsw.cmd.dstat != 0x0c) { + /* Set the 'ONLINE' flag depending on sense byte 1 */ + if(*(((__u8 *) irb->ecw) + 1) & SENSE_DRIVE_ONLINE) + device->tape_generic_status |= GMT_ONLINE(~0); + else + device->tape_generic_status &= ~GMT_ONLINE(~0); + + /* + * Any request that does not come back with channel end + * and device end is unusual. Log the sense data. + */ + DBF_EVENT(3,"-- Tape Interrupthandler --\n"); + tape_dump_sense_dbf(device, request, irb); + } else { + /* Upon normal completion the device _is_ online */ + device->tape_generic_status |= GMT_ONLINE(~0); + } + if (device->tape_state == TS_NOT_OPER) { + DBF_EVENT(6, "tape:device is not operational\n"); + return; + } + + /* + * Request that were canceled still come back with an interrupt. + * To detect these request the state will be set to TAPE_REQUEST_DONE. + */ + if(request != NULL && request->status == TAPE_REQUEST_DONE) { + __tape_end_request(device, request, -EIO); + return; + } + + rc = device->discipline->irq(device, request, irb); + /* + * rc < 0 : request finished unsuccessfully. + * rc == TAPE_IO_SUCCESS: request finished successfully. + * rc == TAPE_IO_PENDING: request is still running. Ignore rc. + * rc == TAPE_IO_RETRY: request finished but needs another go. + * rc == TAPE_IO_STOP: request needs to get terminated. + */ + switch (rc) { + case TAPE_IO_SUCCESS: + /* Upon normal completion the device _is_ online */ + device->tape_generic_status |= GMT_ONLINE(~0); + __tape_end_request(device, request, rc); + break; + case TAPE_IO_PENDING: + break; + case TAPE_IO_LONG_BUSY: + device->lb_timeout.expires = jiffies + + LONG_BUSY_TIMEOUT * HZ; + DBF_EVENT(3, "(%08x): add timer\n", device->cdev_id); + add_timer(&device->lb_timeout); + request->status = TAPE_REQUEST_LONG_BUSY; + break; + case TAPE_IO_RETRY: + rc = __tape_start_io(device, request); + if (rc) + __tape_end_request(device, request, rc); + break; + case TAPE_IO_STOP: + rc = __tape_cancel_io(device, request); + if (rc) + __tape_end_request(device, request, rc); + break; + default: + if (rc > 0) { + DBF_EVENT(6, "xunknownrc\n"); + __tape_end_request(device, request, -EIO); + } else { + __tape_end_request(device, request, rc); + } + break; + } +} + +/* + * Tape device open function used by tape_char frontend. + */ +int +tape_open(struct tape_device *device) +{ + int rc; + + spin_lock_irq(get_ccwdev_lock(device->cdev)); + if (device->tape_state == TS_NOT_OPER) { + DBF_EVENT(6, "TAPE:nodev\n"); + rc = -ENODEV; + } else if (device->tape_state == TS_IN_USE) { + DBF_EVENT(6, "TAPE:dbusy\n"); + rc = -EBUSY; + } else if (device->tape_state == TS_BLKUSE) { + DBF_EVENT(6, "TAPE:dbusy\n"); + rc = -EBUSY; + } else if (device->discipline != NULL && + !try_module_get(device->discipline->owner)) { + DBF_EVENT(6, "TAPE:nodisc\n"); + rc = -ENODEV; + } else { + tape_state_set(device, TS_IN_USE); + rc = 0; + } + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + return rc; +} + +/* + * Tape device release function used by tape_char frontend. + */ +int +tape_release(struct tape_device *device) +{ + spin_lock_irq(get_ccwdev_lock(device->cdev)); + if (device->tape_state == TS_IN_USE) + tape_state_set(device, TS_UNUSED); + module_put(device->discipline->owner); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + return 0; +} + +/* + * Execute a magnetic tape command a number of times. + */ +int +tape_mtop(struct tape_device *device, int mt_op, int mt_count) +{ + tape_mtop_fn fn; + int rc; + + DBF_EVENT(6, "TAPE:mtio\n"); + DBF_EVENT(6, "TAPE:ioop: %x\n", mt_op); + DBF_EVENT(6, "TAPE:arg: %x\n", mt_count); + + if (mt_op < 0 || mt_op >= TAPE_NR_MTOPS) + return -EINVAL; + fn = device->discipline->mtop_array[mt_op]; + if (fn == NULL) + return -EINVAL; + + /* We assume that the backends can handle count up to 500. */ + if (mt_op == MTBSR || mt_op == MTFSR || mt_op == MTFSF || + mt_op == MTBSF || mt_op == MTFSFM || mt_op == MTBSFM) { + rc = 0; + for (; mt_count > 500; mt_count -= 500) + if ((rc = fn(device, 500)) != 0) + break; + if (rc == 0) + rc = fn(device, mt_count); + } else + rc = fn(device, mt_count); + return rc; + +} + +/* + * Tape init function. + */ +static int +tape_init (void) +{ + TAPE_DBF_AREA = debug_register ( "tape", 2, 2, 4*sizeof(long)); + debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); +#ifdef DBF_LIKE_HELL + debug_set_level(TAPE_DBF_AREA, 6); +#endif + DBF_EVENT(3, "tape init\n"); + tape_proc_init(); + tapechar_init (); + return 0; +} + +/* + * Tape exit function. + */ +static void +tape_exit(void) +{ + DBF_EVENT(6, "tape exit\n"); + + /* Get rid of the frontends */ + tapechar_exit(); + tape_proc_cleanup(); + debug_unregister (TAPE_DBF_AREA); +} + +MODULE_AUTHOR("(C) 2001 IBM Deutschland Entwicklung GmbH by Carsten Otte and " + "Michael Holzheu (cotte@de.ibm.com,holzheu@de.ibm.com)"); +MODULE_DESCRIPTION("Linux on zSeries channel attached tape device driver"); +MODULE_LICENSE("GPL"); + +module_init(tape_init); +module_exit(tape_exit); + +EXPORT_SYMBOL(tape_generic_remove); +EXPORT_SYMBOL(tape_generic_probe); +EXPORT_SYMBOL(tape_generic_online); +EXPORT_SYMBOL(tape_generic_offline); +EXPORT_SYMBOL(tape_generic_pm_suspend); +EXPORT_SYMBOL(tape_put_device); +EXPORT_SYMBOL(tape_get_device); +EXPORT_SYMBOL(tape_state_verbose); +EXPORT_SYMBOL(tape_op_verbose); +EXPORT_SYMBOL(tape_state_set); +EXPORT_SYMBOL(tape_med_state_set); +EXPORT_SYMBOL(tape_alloc_request); +EXPORT_SYMBOL(tape_free_request); +EXPORT_SYMBOL(tape_dump_sense_dbf); +EXPORT_SYMBOL(tape_do_io); +EXPORT_SYMBOL(tape_do_io_async); +EXPORT_SYMBOL(tape_do_io_interruptible); +EXPORT_SYMBOL(tape_cancel_io); +EXPORT_SYMBOL(tape_mtop); diff --git a/drivers/s390/char/tape_proc.c b/drivers/s390/char/tape_proc.c new file mode 100644 index 000000000..32a14ee31 --- /dev/null +++ b/drivers/s390/char/tape_proc.c @@ -0,0 +1,129 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * tape device driver for S/390 and zSeries tapes. + * + * S390 and zSeries version + * Copyright IBM Corp. 2001 + * Author(s): Carsten Otte + * Michael Holzheu + * Tuan Ngo-Anh + * + * PROCFS Functions + */ + +#define KMSG_COMPONENT "tape" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include + +#define TAPE_DBF_AREA tape_core_dbf + +#include "tape.h" + +static const char *tape_med_st_verbose[MS_SIZE] = +{ + [MS_UNKNOWN] = "UNKNOWN ", + [MS_LOADED] = "LOADED ", + [MS_UNLOADED] = "UNLOADED" +}; + +/* our proc tapedevices entry */ +static struct proc_dir_entry *tape_proc_devices; + +/* + * Show function for /proc/tapedevices + */ +static int tape_proc_show(struct seq_file *m, void *v) +{ + struct tape_device *device; + struct tape_request *request; + const char *str; + unsigned long n; + + n = (unsigned long) v - 1; + if (!n) { + seq_printf(m, "TapeNo\tBusID CuType/Model\t" + "DevType/Model\tBlkSize\tState\tOp\tMedState\n"); + } + device = tape_find_device(n); + if (IS_ERR(device)) + return 0; + spin_lock_irq(get_ccwdev_lock(device->cdev)); + seq_printf(m, "%d\t", (int) n); + seq_printf(m, "%-10.10s ", dev_name(&device->cdev->dev)); + seq_printf(m, "%04X/", device->cdev->id.cu_type); + seq_printf(m, "%02X\t", device->cdev->id.cu_model); + seq_printf(m, "%04X/", device->cdev->id.dev_type); + seq_printf(m, "%02X\t\t", device->cdev->id.dev_model); + if (device->char_data.block_size == 0) + seq_printf(m, "auto\t"); + else + seq_printf(m, "%i\t", device->char_data.block_size); + if (device->tape_state >= 0 && + device->tape_state < TS_SIZE) + str = tape_state_verbose[device->tape_state]; + else + str = "UNKNOWN"; + seq_printf(m, "%s\t", str); + if (!list_empty(&device->req_queue)) { + request = list_entry(device->req_queue.next, + struct tape_request, list); + str = tape_op_verbose[request->op]; + } else + str = "---"; + seq_printf(m, "%s\t", str); + seq_printf(m, "%s\n", tape_med_st_verbose[device->medium_state]); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + tape_put_device(device); + return 0; +} + +static void *tape_proc_start(struct seq_file *m, loff_t *pos) +{ + if (*pos >= 256 / TAPE_MINORS_PER_DEV) + return NULL; + return (void *)((unsigned long) *pos + 1); +} + +static void *tape_proc_next(struct seq_file *m, void *v, loff_t *pos) +{ + ++*pos; + return tape_proc_start(m, pos); +} + +static void tape_proc_stop(struct seq_file *m, void *v) +{ +} + +static const struct seq_operations tape_proc_seq = { + .start = tape_proc_start, + .next = tape_proc_next, + .stop = tape_proc_stop, + .show = tape_proc_show, +}; + +/* + * Initialize procfs stuff on startup + */ +void +tape_proc_init(void) +{ + tape_proc_devices = proc_create_seq("tapedevices", + S_IFREG | S_IRUGO | S_IWUSR, NULL, &tape_proc_seq); + if (tape_proc_devices == NULL) { + return; + } +} + +/* + * Cleanup all stuff registered to the procfs + */ +void +tape_proc_cleanup(void) +{ + if (tape_proc_devices != NULL) + remove_proc_entry ("tapedevices", NULL); +} diff --git a/drivers/s390/char/tape_std.c b/drivers/s390/char/tape_std.c new file mode 100644 index 000000000..f7e75d9fe --- /dev/null +++ b/drivers/s390/char/tape_std.c @@ -0,0 +1,744 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * standard tape device functions for ibm tapes. + * + * S390 and zSeries version + * Copyright IBM Corp. 2001, 2002 + * Author(s): Carsten Otte + * Michael Holzheu + * Tuan Ngo-Anh + * Martin Schwidefsky + * Stefan Bader + */ + +#define KMSG_COMPONENT "tape" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include + +#include +#include +#include +#include + +#define TAPE_DBF_AREA tape_core_dbf + +#include "tape.h" +#include "tape_std.h" + +/* + * tape_std_assign + */ +static void +tape_std_assign_timeout(struct timer_list *t) +{ + struct tape_request * request = from_timer(request, t, timer); + struct tape_device * device = request->device; + int rc; + + BUG_ON(!device); + + DBF_EVENT(3, "%08x: Assignment timeout. Device busy.\n", + device->cdev_id); + rc = tape_cancel_io(device, request); + if(rc) + DBF_EVENT(3, "(%08x): Assign timeout: Cancel failed with rc = " + "%i\n", device->cdev_id, rc); +} + +int +tape_std_assign(struct tape_device *device) +{ + int rc; + struct tape_request *request; + + request = tape_alloc_request(2, 11); + if (IS_ERR(request)) + return PTR_ERR(request); + + request->op = TO_ASSIGN; + tape_ccw_cc(request->cpaddr, ASSIGN, 11, request->cpdata); + tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); + + /* + * The assign command sometimes blocks if the device is assigned + * to another host (actually this shouldn't happen but it does). + * So we set up a timeout for this call. + */ + timer_setup(&request->timer, tape_std_assign_timeout, 0); + mod_timer(&request->timer, jiffies + msecs_to_jiffies(2000)); + + rc = tape_do_io_interruptible(device, request); + + del_timer_sync(&request->timer); + + if (rc != 0) { + DBF_EVENT(3, "%08x: assign failed - device might be busy\n", + device->cdev_id); + } else { + DBF_EVENT(3, "%08x: Tape assigned\n", device->cdev_id); + } + tape_free_request(request); + return rc; +} + +/* + * tape_std_unassign + */ +int +tape_std_unassign (struct tape_device *device) +{ + int rc; + struct tape_request *request; + + if (device->tape_state == TS_NOT_OPER) { + DBF_EVENT(3, "(%08x): Can't unassign device\n", + device->cdev_id); + return -EIO; + } + + request = tape_alloc_request(2, 11); + if (IS_ERR(request)) + return PTR_ERR(request); + + request->op = TO_UNASSIGN; + tape_ccw_cc(request->cpaddr, UNASSIGN, 11, request->cpdata); + tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); + + if ((rc = tape_do_io(device, request)) != 0) { + DBF_EVENT(3, "%08x: Unassign failed\n", device->cdev_id); + } else { + DBF_EVENT(3, "%08x: Tape unassigned\n", device->cdev_id); + } + tape_free_request(request); + return rc; +} + +/* + * TAPE390_DISPLAY: Show a string on the tape display. + */ +int +tape_std_display(struct tape_device *device, struct display_struct *disp) +{ + struct tape_request *request; + int rc; + + request = tape_alloc_request(2, 17); + if (IS_ERR(request)) { + DBF_EVENT(3, "TAPE: load display failed\n"); + return PTR_ERR(request); + } + request->op = TO_DIS; + + *(unsigned char *) request->cpdata = disp->cntrl; + DBF_EVENT(5, "TAPE: display cntrl=%04x\n", disp->cntrl); + memcpy(((unsigned char *) request->cpdata) + 1, disp->message1, 8); + memcpy(((unsigned char *) request->cpdata) + 9, disp->message2, 8); + ASCEBC(((unsigned char*) request->cpdata) + 1, 16); + + tape_ccw_cc(request->cpaddr, LOAD_DISPLAY, 17, request->cpdata); + tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); + + rc = tape_do_io_interruptible(device, request); + tape_free_request(request); + return rc; +} + +/* + * Read block id. + */ +int +tape_std_read_block_id(struct tape_device *device, __u64 *id) +{ + struct tape_request *request; + int rc; + + request = tape_alloc_request(3, 8); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_RBI; + /* setup ccws */ + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + tape_ccw_cc(request->cpaddr + 1, READ_BLOCK_ID, 8, request->cpdata); + tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); + /* execute it */ + rc = tape_do_io(device, request); + if (rc == 0) + /* Get result from read buffer. */ + *id = *(__u64 *) request->cpdata; + tape_free_request(request); + return rc; +} + +int +tape_std_terminate_write(struct tape_device *device) +{ + int rc; + + if(device->required_tapemarks == 0) + return 0; + + DBF_LH(5, "tape%d: terminate write %dxEOF\n", device->first_minor, + device->required_tapemarks); + + rc = tape_mtop(device, MTWEOF, device->required_tapemarks); + if (rc) + return rc; + + device->required_tapemarks = 0; + return tape_mtop(device, MTBSR, 1); +} + +/* + * MTLOAD: Loads the tape. + * The default implementation just wait until the tape medium state changes + * to MS_LOADED. + */ +int +tape_std_mtload(struct tape_device *device, int count) +{ + return wait_event_interruptible(device->state_change_wq, + (device->medium_state == MS_LOADED)); +} + +/* + * MTSETBLK: Set block size. + */ +int +tape_std_mtsetblk(struct tape_device *device, int count) +{ + struct idal_buffer *new; + + DBF_LH(6, "tape_std_mtsetblk(%d)\n", count); + if (count <= 0) { + /* + * Just set block_size to 0. tapechar_read/tapechar_write + * will realloc the idal buffer if a bigger one than the + * current is needed. + */ + device->char_data.block_size = 0; + return 0; + } + if (device->char_data.idal_buf != NULL && + device->char_data.idal_buf->size == count) + /* We already have a idal buffer of that size. */ + return 0; + + if (count > MAX_BLOCKSIZE) { + DBF_EVENT(3, "Invalid block size (%d > %d) given.\n", + count, MAX_BLOCKSIZE); + return -EINVAL; + } + + /* Allocate a new idal buffer. */ + new = idal_buffer_alloc(count, 0); + if (IS_ERR(new)) + return -ENOMEM; + if (device->char_data.idal_buf != NULL) + idal_buffer_free(device->char_data.idal_buf); + device->char_data.idal_buf = new; + device->char_data.block_size = count; + + DBF_LH(6, "new blocksize is %d\n", device->char_data.block_size); + + return 0; +} + +/* + * MTRESET: Set block size to 0. + */ +int +tape_std_mtreset(struct tape_device *device, int count) +{ + DBF_EVENT(6, "TCHAR:devreset:\n"); + device->char_data.block_size = 0; + return 0; +} + +/* + * MTFSF: Forward space over 'count' file marks. The tape is positioned + * at the EOT (End of Tape) side of the file mark. + */ +int +tape_std_mtfsf(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + struct ccw1 *ccw; + + request = tape_alloc_request(mt_count + 2, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_FSF; + /* setup ccws */ + ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, + device->modeset_byte); + ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); + ccw = tape_ccw_end(ccw, NOP, 0, NULL); + + /* execute it */ + return tape_do_io_free(device, request); +} + +/* + * MTFSR: Forward space over 'count' tape blocks (blocksize is set + * via MTSETBLK. + */ +int +tape_std_mtfsr(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + struct ccw1 *ccw; + int rc; + + request = tape_alloc_request(mt_count + 2, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_FSB; + /* setup ccws */ + ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, + device->modeset_byte); + ccw = tape_ccw_repeat(ccw, FORSPACEBLOCK, mt_count); + ccw = tape_ccw_end(ccw, NOP, 0, NULL); + + /* execute it */ + rc = tape_do_io(device, request); + if (rc == 0 && request->rescnt > 0) { + DBF_LH(3, "FSR over tapemark\n"); + rc = 1; + } + tape_free_request(request); + + return rc; +} + +/* + * MTBSR: Backward space over 'count' tape blocks. + * (blocksize is set via MTSETBLK. + */ +int +tape_std_mtbsr(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + struct ccw1 *ccw; + int rc; + + request = tape_alloc_request(mt_count + 2, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_BSB; + /* setup ccws */ + ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, + device->modeset_byte); + ccw = tape_ccw_repeat(ccw, BACKSPACEBLOCK, mt_count); + ccw = tape_ccw_end(ccw, NOP, 0, NULL); + + /* execute it */ + rc = tape_do_io(device, request); + if (rc == 0 && request->rescnt > 0) { + DBF_LH(3, "BSR over tapemark\n"); + rc = 1; + } + tape_free_request(request); + + return rc; +} + +/* + * MTWEOF: Write 'count' file marks at the current position. + */ +int +tape_std_mtweof(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + struct ccw1 *ccw; + + request = tape_alloc_request(mt_count + 2, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_WTM; + /* setup ccws */ + ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, + device->modeset_byte); + ccw = tape_ccw_repeat(ccw, WRITETAPEMARK, mt_count); + ccw = tape_ccw_end(ccw, NOP, 0, NULL); + + /* execute it */ + return tape_do_io_free(device, request); +} + +/* + * MTBSFM: Backward space over 'count' file marks. + * The tape is positioned at the BOT (Begin Of Tape) side of the + * last skipped file mark. + */ +int +tape_std_mtbsfm(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + struct ccw1 *ccw; + + request = tape_alloc_request(mt_count + 2, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_BSF; + /* setup ccws */ + ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, + device->modeset_byte); + ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); + ccw = tape_ccw_end(ccw, NOP, 0, NULL); + + /* execute it */ + return tape_do_io_free(device, request); +} + +/* + * MTBSF: Backward space over 'count' file marks. The tape is positioned at + * the EOT (End of Tape) side of the last skipped file mark. + */ +int +tape_std_mtbsf(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + struct ccw1 *ccw; + int rc; + + request = tape_alloc_request(mt_count + 2, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_BSF; + /* setup ccws */ + ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, + device->modeset_byte); + ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count); + ccw = tape_ccw_end(ccw, NOP, 0, NULL); + /* execute it */ + rc = tape_do_io_free(device, request); + if (rc == 0) { + rc = tape_mtop(device, MTFSR, 1); + if (rc > 0) + rc = 0; + } + return rc; +} + +/* + * MTFSFM: Forward space over 'count' file marks. + * The tape is positioned at the BOT (Begin Of Tape) side + * of the last skipped file mark. + */ +int +tape_std_mtfsfm(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + struct ccw1 *ccw; + int rc; + + request = tape_alloc_request(mt_count + 2, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_FSF; + /* setup ccws */ + ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, + device->modeset_byte); + ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count); + ccw = tape_ccw_end(ccw, NOP, 0, NULL); + /* execute it */ + rc = tape_do_io_free(device, request); + if (rc == 0) { + rc = tape_mtop(device, MTBSR, 1); + if (rc > 0) + rc = 0; + } + + return rc; +} + +/* + * MTREW: Rewind the tape. + */ +int +tape_std_mtrew(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + + request = tape_alloc_request(3, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_REW; + /* setup ccws */ + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, + device->modeset_byte); + tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); + tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); + + /* execute it */ + return tape_do_io_free(device, request); +} + +/* + * MTOFFL: Rewind the tape and put the drive off-line. + * Implement 'rewind unload' + */ +int +tape_std_mtoffl(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + + request = tape_alloc_request(3, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_RUN; + /* setup ccws */ + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + tape_ccw_cc(request->cpaddr + 1, REWIND_UNLOAD, 0, NULL); + tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); + + /* execute it */ + return tape_do_io_free(device, request); +} + +/* + * MTNOP: 'No operation'. + */ +int +tape_std_mtnop(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + + request = tape_alloc_request(2, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_NOP; + /* setup ccws */ + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); + /* execute it */ + return tape_do_io_free(device, request); +} + +/* + * MTEOM: positions at the end of the portion of the tape already used + * for recordind data. MTEOM positions after the last file mark, ready for + * appending another file. + */ +int +tape_std_mteom(struct tape_device *device, int mt_count) +{ + int rc; + + /* + * Seek from the beginning of tape (rewind). + */ + if ((rc = tape_mtop(device, MTREW, 1)) < 0) + return rc; + + /* + * The logical end of volume is given by two sewuential tapemarks. + * Look for this by skipping to the next file (over one tapemark) + * and then test for another one (fsr returns 1 if a tapemark was + * encountered). + */ + do { + if ((rc = tape_mtop(device, MTFSF, 1)) < 0) + return rc; + if ((rc = tape_mtop(device, MTFSR, 1)) < 0) + return rc; + } while (rc == 0); + + return tape_mtop(device, MTBSR, 1); +} + +/* + * MTRETEN: Retension the tape, i.e. forward space to end of tape and rewind. + */ +int +tape_std_mtreten(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + + request = tape_alloc_request(4, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_FSF; + /* setup ccws */ + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + tape_ccw_cc(request->cpaddr + 1,FORSPACEFILE, 0, NULL); + tape_ccw_cc(request->cpaddr + 2, NOP, 0, NULL); + tape_ccw_end(request->cpaddr + 3, CCW_CMD_TIC, 0, request->cpaddr); + /* execute it, MTRETEN rc gets ignored */ + tape_do_io_interruptible(device, request); + tape_free_request(request); + return tape_mtop(device, MTREW, 1); +} + +/* + * MTERASE: erases the tape. + */ +int +tape_std_mterase(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + + request = tape_alloc_request(6, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_DSE; + /* setup ccws */ + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL); + tape_ccw_cc(request->cpaddr + 2, ERASE_GAP, 0, NULL); + tape_ccw_cc(request->cpaddr + 3, DATA_SEC_ERASE, 0, NULL); + tape_ccw_cc(request->cpaddr + 4, REWIND, 0, NULL); + tape_ccw_end(request->cpaddr + 5, NOP, 0, NULL); + + /* execute it */ + return tape_do_io_free(device, request); +} + +/* + * MTUNLOAD: Rewind the tape and unload it. + */ +int +tape_std_mtunload(struct tape_device *device, int mt_count) +{ + return tape_mtop(device, MTOFFL, mt_count); +} + +/* + * MTCOMPRESSION: used to enable compression. + * Sets the IDRC on/off. + */ +int +tape_std_mtcompression(struct tape_device *device, int mt_count) +{ + struct tape_request *request; + + if (mt_count < 0 || mt_count > 1) { + DBF_EXCEPTION(6, "xcom parm\n"); + return -EINVAL; + } + request = tape_alloc_request(2, 0); + if (IS_ERR(request)) + return PTR_ERR(request); + request->op = TO_NOP; + /* setup ccws */ + if (mt_count == 0) + *device->modeset_byte &= ~0x08; + else + *device->modeset_byte |= 0x08; + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL); + /* execute it */ + return tape_do_io_free(device, request); +} + +/* + * Read Block + */ +struct tape_request * +tape_std_read_block(struct tape_device *device, size_t count) +{ + struct tape_request *request; + + /* + * We have to alloc 4 ccws in order to be able to transform request + * into a read backward request in error case. + */ + request = tape_alloc_request(4, 0); + if (IS_ERR(request)) { + DBF_EXCEPTION(6, "xrbl fail"); + return request; + } + request->op = TO_RFO; + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + tape_ccw_end_idal(request->cpaddr + 1, READ_FORWARD, + device->char_data.idal_buf); + DBF_EVENT(6, "xrbl ccwg\n"); + return request; +} + +/* + * Read Block backward transformation function. + */ +void +tape_std_read_backward(struct tape_device *device, struct tape_request *request) +{ + /* + * We have allocated 4 ccws in tape_std_read, so we can now + * transform the request to a read backward, followed by a + * forward space block. + */ + request->op = TO_RBA; + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + tape_ccw_cc_idal(request->cpaddr + 1, READ_BACKWARD, + device->char_data.idal_buf); + tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL); + tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL); + DBF_EVENT(6, "xrop ccwg");} + +/* + * Write Block + */ +struct tape_request * +tape_std_write_block(struct tape_device *device, size_t count) +{ + struct tape_request *request; + + request = tape_alloc_request(2, 0); + if (IS_ERR(request)) { + DBF_EXCEPTION(6, "xwbl fail\n"); + return request; + } + request->op = TO_WRI; + tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); + tape_ccw_end_idal(request->cpaddr + 1, WRITE_CMD, + device->char_data.idal_buf); + DBF_EVENT(6, "xwbl ccwg\n"); + return request; +} + +/* + * This routine is called by frontend after an ENOSP on write + */ +void +tape_std_process_eov(struct tape_device *device) +{ + /* + * End of volume: We have to backspace the last written record, then + * we TRY to write a tapemark and then backspace over the written TM + */ + if (tape_mtop(device, MTBSR, 1) == 0 && + tape_mtop(device, MTWEOF, 1) == 0) { + tape_mtop(device, MTBSR, 1); + } +} + +EXPORT_SYMBOL(tape_std_assign); +EXPORT_SYMBOL(tape_std_unassign); +EXPORT_SYMBOL(tape_std_display); +EXPORT_SYMBOL(tape_std_read_block_id); +EXPORT_SYMBOL(tape_std_mtload); +EXPORT_SYMBOL(tape_std_mtsetblk); +EXPORT_SYMBOL(tape_std_mtreset); +EXPORT_SYMBOL(tape_std_mtfsf); +EXPORT_SYMBOL(tape_std_mtfsr); +EXPORT_SYMBOL(tape_std_mtbsr); +EXPORT_SYMBOL(tape_std_mtweof); +EXPORT_SYMBOL(tape_std_mtbsfm); +EXPORT_SYMBOL(tape_std_mtbsf); +EXPORT_SYMBOL(tape_std_mtfsfm); +EXPORT_SYMBOL(tape_std_mtrew); +EXPORT_SYMBOL(tape_std_mtoffl); +EXPORT_SYMBOL(tape_std_mtnop); +EXPORT_SYMBOL(tape_std_mteom); +EXPORT_SYMBOL(tape_std_mtreten); +EXPORT_SYMBOL(tape_std_mterase); +EXPORT_SYMBOL(tape_std_mtunload); +EXPORT_SYMBOL(tape_std_mtcompression); +EXPORT_SYMBOL(tape_std_read_block); +EXPORT_SYMBOL(tape_std_read_backward); +EXPORT_SYMBOL(tape_std_write_block); +EXPORT_SYMBOL(tape_std_process_eov); diff --git a/drivers/s390/char/tape_std.h b/drivers/s390/char/tape_std.h new file mode 100644 index 000000000..53ec8e287 --- /dev/null +++ b/drivers/s390/char/tape_std.h @@ -0,0 +1,155 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * standard tape device functions for ibm tapes. + * + * Copyright IBM Corp. 2001, 2006 + * Author(s): Carsten Otte + * Tuan Ngo-Anh + * Martin Schwidefsky + */ + +#ifndef _TAPE_STD_H +#define _TAPE_STD_H + +#include + +/* + * Biggest block size to handle. Currently 64K because we only build + * channel programs without data chaining. + */ +#define MAX_BLOCKSIZE 65535 + +/* + * The CCW commands for the Tape type of command. + */ +#define INVALID_00 0x00 /* Invalid cmd */ +#define BACKSPACEBLOCK 0x27 /* Back Space block */ +#define BACKSPACEFILE 0x2f /* Back Space file */ +#define DATA_SEC_ERASE 0x97 /* Data security erase */ +#define ERASE_GAP 0x17 /* Erase Gap */ +#define FORSPACEBLOCK 0x37 /* Forward space block */ +#define FORSPACEFILE 0x3F /* Forward Space file */ +#define FORCE_STREAM_CNT 0xEB /* Forced streaming count # */ +#define NOP 0x03 /* No operation */ +#define READ_FORWARD 0x02 /* Read forward */ +#define REWIND 0x07 /* Rewind */ +#define REWIND_UNLOAD 0x0F /* Rewind and Unload */ +#define SENSE 0x04 /* Sense */ +#define NEW_MODE_SET 0xEB /* Guess it is Mode set */ +#define WRITE_CMD 0x01 /* Write */ +#define WRITETAPEMARK 0x1F /* Write Tape Mark */ + +#define ASSIGN 0xB7 /* 3420 REJECT,3480 OK */ +#define CONTROL_ACCESS 0xE3 /* Set high speed */ +#define DIAG_MODE_SET 0x0B /* 3420 NOP, 3480 REJECT */ +#define LOAD_DISPLAY 0x9F /* 3420 REJECT,3480 OK */ +#define LOCATE 0x4F /* 3420 REJ, 3480 NOP */ +#define LOOP_WRITE_TO_READ 0x8B /* 3480 REJECT */ +#define MODE_SET_DB 0xDB /* 3420 REJECT,3480 OK */ +#define MODE_SET_C3 0xC3 /* for 3420 */ +#define MODE_SET_CB 0xCB /* for 3420 */ +#define MODE_SET_D3 0xD3 /* for 3420 */ +#define READ_BACKWARD 0x0C /* */ +#define READ_BLOCK_ID 0x22 /* 3420 REJECT,3480 OK */ +#define READ_BUFFER 0x12 /* 3420 REJECT,3480 OK */ +#define READ_BUFF_LOG 0x24 /* 3420 REJECT,3480 OK */ +#define RELEASE 0xD4 /* 3420 NOP, 3480 REJECT */ +#define REQ_TRK_IN_ERROR 0x1B /* 3420 NOP, 3480 REJECT */ +#define RESERVE 0xF4 /* 3420 NOP, 3480 REJECT */ +#define SENSE_GROUP_ID 0x34 /* 3420 REJECT,3480 OK */ +#define SENSE_ID 0xE4 /* 3420 REJECT,3480 OK */ +#define READ_DEV_CHAR 0x64 /* Read device characteristics */ +#define SET_DIAGNOSE 0x4B /* 3420 NOP, 3480 REJECT */ +#define SET_GROUP_ID 0xAF /* 3420 REJECT,3480 OK */ +#define SET_TAPE_WRITE_IMMED 0xC3 /* for 3480 */ +#define SUSPEND 0x5B /* 3420 REJ, 3480 NOP */ +#define SYNC 0x43 /* Synchronize (flush buffer) */ +#define UNASSIGN 0xC7 /* 3420 REJECT,3480 OK */ +#define PERF_SUBSYS_FUNC 0x77 /* 3490 CMD */ +#define READ_CONFIG_DATA 0xFA /* 3490 CMD */ +#define READ_MESSAGE_ID 0x4E /* 3490 CMD */ +#define READ_SUBSYS_DATA 0x3E /* 3490 CMD */ +#define SET_INTERFACE_ID 0x73 /* 3490 CMD */ + +#define SENSE_COMMAND_REJECT 0x80 +#define SENSE_INTERVENTION_REQUIRED 0x40 +#define SENSE_BUS_OUT_CHECK 0x20 +#define SENSE_EQUIPMENT_CHECK 0x10 +#define SENSE_DATA_CHECK 0x08 +#define SENSE_OVERRUN 0x04 +#define SENSE_DEFERRED_UNIT_CHECK 0x02 +#define SENSE_ASSIGNED_ELSEWHERE 0x01 + +#define SENSE_LOCATE_FAILURE 0x80 +#define SENSE_DRIVE_ONLINE 0x40 +#define SENSE_RESERVED 0x20 +#define SENSE_RECORD_SEQUENCE_ERR 0x10 +#define SENSE_BEGINNING_OF_TAPE 0x08 +#define SENSE_WRITE_MODE 0x04 +#define SENSE_WRITE_PROTECT 0x02 +#define SENSE_NOT_CAPABLE 0x01 + +#define SENSE_CHANNEL_ADAPTER_CODE 0xE0 +#define SENSE_CHANNEL_ADAPTER_LOC 0x10 +#define SENSE_REPORTING_CU 0x08 +#define SENSE_AUTOMATIC_LOADER 0x04 +#define SENSE_TAPE_SYNC_MODE 0x02 +#define SENSE_TAPE_POSITIONING 0x01 + +/* discipline functions */ +struct tape_request *tape_std_read_block(struct tape_device *, size_t); +void tape_std_read_backward(struct tape_device *device, + struct tape_request *request); +struct tape_request *tape_std_write_block(struct tape_device *, size_t); +void tape_std_check_locate(struct tape_device *, struct tape_request *); + +/* Some non-mtop commands. */ +int tape_std_assign(struct tape_device *); +int tape_std_unassign(struct tape_device *); +int tape_std_read_block_id(struct tape_device *device, __u64 *id); +int tape_std_display(struct tape_device *, struct display_struct *disp); +int tape_std_terminate_write(struct tape_device *); + +/* Standard magnetic tape commands. */ +int tape_std_mtbsf(struct tape_device *, int); +int tape_std_mtbsfm(struct tape_device *, int); +int tape_std_mtbsr(struct tape_device *, int); +int tape_std_mtcompression(struct tape_device *, int); +int tape_std_mteom(struct tape_device *, int); +int tape_std_mterase(struct tape_device *, int); +int tape_std_mtfsf(struct tape_device *, int); +int tape_std_mtfsfm(struct tape_device *, int); +int tape_std_mtfsr(struct tape_device *, int); +int tape_std_mtload(struct tape_device *, int); +int tape_std_mtnop(struct tape_device *, int); +int tape_std_mtoffl(struct tape_device *, int); +int tape_std_mtreset(struct tape_device *, int); +int tape_std_mtreten(struct tape_device *, int); +int tape_std_mtrew(struct tape_device *, int); +int tape_std_mtsetblk(struct tape_device *, int); +int tape_std_mtunload(struct tape_device *, int); +int tape_std_mtweof(struct tape_device *, int); + +/* Event handlers */ +void tape_std_default_handler(struct tape_device *); +void tape_std_unexpect_uchk_handler(struct tape_device *); +void tape_std_irq(struct tape_device *); +void tape_std_process_eov(struct tape_device *); + +// the error recovery stuff: +void tape_std_error_recovery(struct tape_device *); +void tape_std_error_recovery_has_failed(struct tape_device *,int error_id); +void tape_std_error_recovery_succeded(struct tape_device *); +void tape_std_error_recovery_do_retry(struct tape_device *); +void tape_std_error_recovery_read_opposite(struct tape_device *); +void tape_std_error_recovery_HWBUG(struct tape_device *, int condno); + +/* S390 tape types */ +enum s390_tape_type { + tape_3480, + tape_3490, + tape_3590, + tape_3592, +}; + +#endif // _TAPE_STD_H diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c new file mode 100644 index 000000000..81067f5bb --- /dev/null +++ b/drivers/s390/char/tty3270.c @@ -0,0 +1,1981 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * IBM/3270 Driver - tty functions. + * + * Author(s): + * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global) + * Rewritten for 2.5 by Martin Schwidefsky + * -- Copyright IBM Corp. 2003 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include +#include +#include + +#include "raw3270.h" +#include "tty3270.h" +#include "keyboard.h" + +#define TTY3270_CHAR_BUF_SIZE 256 +#define TTY3270_OUTPUT_BUFFER_SIZE 1024 +#define TTY3270_STRING_PAGES 5 + +struct tty_driver *tty3270_driver; +static int tty3270_max_index; + +static struct raw3270_fn tty3270_fn; + +struct tty3270_cell { + unsigned char character; + unsigned char highlight; + unsigned char f_color; +}; + +struct tty3270_line { + struct tty3270_cell *cells; + int len; +}; + +#define ESCAPE_NPAR 8 + +/* + * The main tty view data structure. + * FIXME: + * 1) describe line orientation & lines list concept against screen + * 2) describe conversion of screen to lines + * 3) describe line format. + */ +struct tty3270 { + struct raw3270_view view; + struct tty_port port; + void **freemem_pages; /* Array of pages used for freemem. */ + struct list_head freemem; /* List of free memory for strings. */ + + /* Output stuff. */ + struct list_head lines; /* List of lines. */ + struct list_head update; /* List of lines to update. */ + unsigned char wcc; /* Write control character. */ + int nr_lines; /* # lines in list. */ + int nr_up; /* # lines up in history. */ + unsigned long update_flags; /* Update indication bits. */ + struct string *status; /* Lower right of display. */ + struct raw3270_request *write; /* Single write request. */ + struct timer_list timer; /* Output delay timer. */ + + /* Current tty screen. */ + unsigned int cx, cy; /* Current output position. */ + unsigned int highlight; /* Blink/reverse/underscore */ + unsigned int f_color; /* Foreground color */ + struct tty3270_line *screen; + unsigned int n_model, n_cols, n_rows; /* New model & size */ + struct work_struct resize_work; + + /* Input stuff. */ + struct string *prompt; /* Output string for input area. */ + struct string *input; /* Input string for read request. */ + struct raw3270_request *read; /* Single read request. */ + struct raw3270_request *kreset; /* Single keyboard reset request. */ + unsigned char inattr; /* Visible/invisible input. */ + int throttle, attn; /* tty throttle/unthrottle. */ + struct tasklet_struct readlet; /* Tasklet to issue read request. */ + struct tasklet_struct hanglet; /* Tasklet to hang up the tty. */ + struct kbd_data *kbd; /* key_maps stuff. */ + + /* Escape sequence parsing. */ + int esc_state, esc_ques, esc_npar; + int esc_par[ESCAPE_NPAR]; + unsigned int saved_cx, saved_cy; + unsigned int saved_highlight, saved_f_color; + + /* Command recalling. */ + struct list_head rcl_lines; /* List of recallable lines. */ + struct list_head *rcl_walk; /* Point in rcl_lines list. */ + int rcl_nr, rcl_max; /* Number/max number of rcl_lines. */ + + /* Character array for put_char/flush_chars. */ + unsigned int char_count; + char char_buf[TTY3270_CHAR_BUF_SIZE]; +}; + +/* tty3270->update_flags. See tty3270_update for details. */ +#define TTY_UPDATE_ERASE 1 /* Use EWRITEA instead of WRITE. */ +#define TTY_UPDATE_LIST 2 /* Update lines in tty3270->update. */ +#define TTY_UPDATE_INPUT 4 /* Update input line. */ +#define TTY_UPDATE_STATUS 8 /* Update status line. */ +#define TTY_UPDATE_ALL 16 /* Recreate screen. */ + +static void tty3270_update(struct timer_list *); +static void tty3270_resize_work(struct work_struct *work); + +/* + * Setup timeout for a device. On timeout trigger an update. + */ +static void tty3270_set_timer(struct tty3270 *tp, int expires) +{ + mod_timer(&tp->timer, jiffies + expires); +} + +/* + * The input line are the two last lines of the screen. + */ +static void +tty3270_update_prompt(struct tty3270 *tp, char *input, int count) +{ + struct string *line; + unsigned int off; + + line = tp->prompt; + if (count != 0) + line->string[5] = TF_INMDT; + else + line->string[5] = tp->inattr; + if (count > tp->view.cols * 2 - 11) + count = tp->view.cols * 2 - 11; + memcpy(line->string + 6, input, count); + line->string[6 + count] = TO_IC; + /* Clear to end of input line. */ + if (count < tp->view.cols * 2 - 11) { + line->string[7 + count] = TO_RA; + line->string[10 + count] = 0; + off = tp->view.cols * tp->view.rows - 9; + raw3270_buffer_address(tp->view.dev, line->string+count+8, off); + line->len = 11 + count; + } else + line->len = 7 + count; + tp->update_flags |= TTY_UPDATE_INPUT; +} + +static void +tty3270_create_prompt(struct tty3270 *tp) +{ + static const unsigned char blueprint[] = + { TO_SBA, 0, 0, 0x6e, TO_SF, TF_INPUT, + /* empty input string */ + TO_IC, TO_RA, 0, 0, 0 }; + struct string *line; + unsigned int offset; + + line = alloc_string(&tp->freemem, + sizeof(blueprint) + tp->view.cols * 2 - 9); + tp->prompt = line; + tp->inattr = TF_INPUT; + /* Copy blueprint to status line */ + memcpy(line->string, blueprint, sizeof(blueprint)); + line->len = sizeof(blueprint); + /* Set output offsets. */ + offset = tp->view.cols * (tp->view.rows - 2); + raw3270_buffer_address(tp->view.dev, line->string + 1, offset); + offset = tp->view.cols * tp->view.rows - 9; + raw3270_buffer_address(tp->view.dev, line->string + 8, offset); + + /* Allocate input string for reading. */ + tp->input = alloc_string(&tp->freemem, tp->view.cols * 2 - 9 + 6); +} + +/* + * The status line is the last line of the screen. It shows the string + * "Running"/"Holding" in the lower right corner of the screen. + */ +static void +tty3270_update_status(struct tty3270 * tp) +{ + char *str; + + str = (tp->nr_up != 0) ? "History" : "Running"; + memcpy(tp->status->string + 8, str, 7); + codepage_convert(tp->view.ascebc, tp->status->string + 8, 7); + tp->update_flags |= TTY_UPDATE_STATUS; +} + +static void +tty3270_create_status(struct tty3270 * tp) +{ + static const unsigned char blueprint[] = + { TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, TAC_GREEN, + 0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_COLOR, + TAC_RESET }; + struct string *line; + unsigned int offset; + + line = alloc_string(&tp->freemem,sizeof(blueprint)); + tp->status = line; + /* Copy blueprint to status line */ + memcpy(line->string, blueprint, sizeof(blueprint)); + /* Set address to start of status string (= last 9 characters). */ + offset = tp->view.cols * tp->view.rows - 9; + raw3270_buffer_address(tp->view.dev, line->string + 1, offset); +} + +/* + * Set output offsets to 3270 datastream fragment of a tty string. + * (TO_SBA offset at the start and TO_RA offset at the end of the string) + */ +static void +tty3270_update_string(struct tty3270 *tp, struct string *line, int nr) +{ + unsigned char *cp; + + raw3270_buffer_address(tp->view.dev, line->string + 1, + tp->view.cols * nr); + cp = line->string + line->len - 4; + if (*cp == TO_RA) + raw3270_buffer_address(tp->view.dev, cp + 1, + tp->view.cols * (nr + 1)); +} + +/* + * Rebuild update list to print all lines. + */ +static void +tty3270_rebuild_update(struct tty3270 *tp) +{ + struct string *s, *n; + int line, nr_up; + + /* + * Throw away update list and create a new one, + * containing all lines that will fit on the screen. + */ + list_for_each_entry_safe(s, n, &tp->update, update) + list_del_init(&s->update); + line = tp->view.rows - 3; + nr_up = tp->nr_up; + list_for_each_entry_reverse(s, &tp->lines, list) { + if (nr_up > 0) { + nr_up--; + continue; + } + tty3270_update_string(tp, s, line); + list_add(&s->update, &tp->update); + if (--line < 0) + break; + } + tp->update_flags |= TTY_UPDATE_LIST; +} + +/* + * Alloc string for size bytes. If there is not enough room in + * freemem, free strings until there is room. + */ +static struct string * +tty3270_alloc_string(struct tty3270 *tp, size_t size) +{ + struct string *s, *n; + + s = alloc_string(&tp->freemem, size); + if (s) + return s; + list_for_each_entry_safe(s, n, &tp->lines, list) { + BUG_ON(tp->nr_lines <= tp->view.rows - 2); + list_del(&s->list); + if (!list_empty(&s->update)) + list_del(&s->update); + tp->nr_lines--; + if (free_string(&tp->freemem, s) >= size) + break; + } + s = alloc_string(&tp->freemem, size); + BUG_ON(!s); + if (tp->nr_up != 0 && + tp->nr_up + tp->view.rows - 2 >= tp->nr_lines) { + tp->nr_up = tp->nr_lines - tp->view.rows + 2; + tty3270_rebuild_update(tp); + tty3270_update_status(tp); + } + return s; +} + +/* + * Add an empty line to the list. + */ +static void +tty3270_blank_line(struct tty3270 *tp) +{ + static const unsigned char blueprint[] = + { TO_SBA, 0, 0, TO_SA, TAT_EXTHI, TAX_RESET, + TO_SA, TAT_COLOR, TAC_RESET, TO_RA, 0, 0, 0 }; + struct string *s; + + s = tty3270_alloc_string(tp, sizeof(blueprint)); + memcpy(s->string, blueprint, sizeof(blueprint)); + s->len = sizeof(blueprint); + list_add_tail(&s->list, &tp->lines); + tp->nr_lines++; + if (tp->nr_up != 0) + tp->nr_up++; +} + +/* + * Create a blank screen and remove all lines from the history. + */ +static void +tty3270_blank_screen(struct tty3270 *tp) +{ + struct string *s, *n; + int i; + + for (i = 0; i < tp->view.rows - 2; i++) + tp->screen[i].len = 0; + tp->nr_up = 0; + list_for_each_entry_safe(s, n, &tp->lines, list) { + list_del(&s->list); + if (!list_empty(&s->update)) + list_del(&s->update); + tp->nr_lines--; + free_string(&tp->freemem, s); + } +} + +/* + * Write request completion callback. + */ +static void +tty3270_write_callback(struct raw3270_request *rq, void *data) +{ + struct tty3270 *tp = container_of(rq->view, struct tty3270, view); + + if (rq->rc != 0) { + /* Write wasn't successful. Refresh all. */ + tp->update_flags = TTY_UPDATE_ALL; + tty3270_set_timer(tp, 1); + } + raw3270_request_reset(rq); + xchg(&tp->write, rq); +} + +/* + * Update 3270 display. + */ +static void +tty3270_update(struct timer_list *t) +{ + struct tty3270 *tp = from_timer(tp, t, timer); + static char invalid_sba[2] = { 0xff, 0xff }; + struct raw3270_request *wrq; + unsigned long updated; + struct string *s, *n; + char *sba, *str; + int rc, len; + + wrq = xchg(&tp->write, 0); + if (!wrq) { + tty3270_set_timer(tp, 1); + return; + } + + spin_lock(&tp->view.lock); + updated = 0; + if (tp->update_flags & TTY_UPDATE_ALL) { + tty3270_rebuild_update(tp); + tty3270_update_status(tp); + tp->update_flags = TTY_UPDATE_ERASE | TTY_UPDATE_LIST | + TTY_UPDATE_INPUT | TTY_UPDATE_STATUS; + } + if (tp->update_flags & TTY_UPDATE_ERASE) { + /* Use erase write alternate to erase display. */ + raw3270_request_set_cmd(wrq, TC_EWRITEA); + updated |= TTY_UPDATE_ERASE; + } else + raw3270_request_set_cmd(wrq, TC_WRITE); + + raw3270_request_add_data(wrq, &tp->wcc, 1); + tp->wcc = TW_NONE; + + /* + * Update status line. + */ + if (tp->update_flags & TTY_UPDATE_STATUS) + if (raw3270_request_add_data(wrq, tp->status->string, + tp->status->len) == 0) + updated |= TTY_UPDATE_STATUS; + + /* + * Write input line. + */ + if (tp->update_flags & TTY_UPDATE_INPUT) + if (raw3270_request_add_data(wrq, tp->prompt->string, + tp->prompt->len) == 0) + updated |= TTY_UPDATE_INPUT; + + sba = invalid_sba; + + if (tp->update_flags & TTY_UPDATE_LIST) { + /* Write strings in the update list to the screen. */ + list_for_each_entry_safe(s, n, &tp->update, update) { + str = s->string; + len = s->len; + /* + * Skip TO_SBA at the start of the string if the + * last output position matches the start address + * of this line. + */ + if (s->string[1] == sba[0] && s->string[2] == sba[1]) + str += 3, len -= 3; + if (raw3270_request_add_data(wrq, str, len) != 0) + break; + list_del_init(&s->update); + if (s->string[s->len - 4] == TO_RA) + sba = s->string + s->len - 3; + else + sba = invalid_sba; + } + if (list_empty(&tp->update)) + updated |= TTY_UPDATE_LIST; + } + wrq->callback = tty3270_write_callback; + rc = raw3270_start(&tp->view, wrq); + if (rc == 0) { + tp->update_flags &= ~updated; + if (tp->update_flags) + tty3270_set_timer(tp, 1); + } else { + raw3270_request_reset(wrq); + xchg(&tp->write, wrq); + } + spin_unlock(&tp->view.lock); +} + +/* + * Command recalling. + */ +static void +tty3270_rcl_add(struct tty3270 *tp, char *input, int len) +{ + struct string *s; + + tp->rcl_walk = NULL; + if (len <= 0) + return; + if (tp->rcl_nr >= tp->rcl_max) { + s = list_entry(tp->rcl_lines.next, struct string, list); + list_del(&s->list); + free_string(&tp->freemem, s); + tp->rcl_nr--; + } + s = tty3270_alloc_string(tp, len); + memcpy(s->string, input, len); + list_add_tail(&s->list, &tp->rcl_lines); + tp->rcl_nr++; +} + +static void +tty3270_rcl_backward(struct kbd_data *kbd) +{ + struct tty3270 *tp = container_of(kbd->port, struct tty3270, port); + struct string *s; + + spin_lock_bh(&tp->view.lock); + if (tp->inattr == TF_INPUT) { + if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines) + tp->rcl_walk = tp->rcl_walk->prev; + else if (!list_empty(&tp->rcl_lines)) + tp->rcl_walk = tp->rcl_lines.prev; + s = tp->rcl_walk ? + list_entry(tp->rcl_walk, struct string, list) : NULL; + if (tp->rcl_walk) { + s = list_entry(tp->rcl_walk, struct string, list); + tty3270_update_prompt(tp, s->string, s->len); + } else + tty3270_update_prompt(tp, NULL, 0); + tty3270_set_timer(tp, 1); + } + spin_unlock_bh(&tp->view.lock); +} + +/* + * Deactivate tty view. + */ +static void +tty3270_exit_tty(struct kbd_data *kbd) +{ + struct tty3270 *tp = container_of(kbd->port, struct tty3270, port); + + raw3270_deactivate_view(&tp->view); +} + +/* + * Scroll forward in history. + */ +static void +tty3270_scroll_forward(struct kbd_data *kbd) +{ + struct tty3270 *tp = container_of(kbd->port, struct tty3270, port); + int nr_up; + + spin_lock_bh(&tp->view.lock); + nr_up = tp->nr_up - tp->view.rows + 2; + if (nr_up < 0) + nr_up = 0; + if (nr_up != tp->nr_up) { + tp->nr_up = nr_up; + tty3270_rebuild_update(tp); + tty3270_update_status(tp); + tty3270_set_timer(tp, 1); + } + spin_unlock_bh(&tp->view.lock); +} + +/* + * Scroll backward in history. + */ +static void +tty3270_scroll_backward(struct kbd_data *kbd) +{ + struct tty3270 *tp = container_of(kbd->port, struct tty3270, port); + int nr_up; + + spin_lock_bh(&tp->view.lock); + nr_up = tp->nr_up + tp->view.rows - 2; + if (nr_up + tp->view.rows - 2 > tp->nr_lines) + nr_up = tp->nr_lines - tp->view.rows + 2; + if (nr_up != tp->nr_up) { + tp->nr_up = nr_up; + tty3270_rebuild_update(tp); + tty3270_update_status(tp); + tty3270_set_timer(tp, 1); + } + spin_unlock_bh(&tp->view.lock); +} + +/* + * Pass input line to tty. + */ +static void +tty3270_read_tasklet(struct raw3270_request *rrq) +{ + static char kreset_data = TW_KR; + struct tty3270 *tp = container_of(rrq->view, struct tty3270, view); + char *input; + int len; + + spin_lock_bh(&tp->view.lock); + /* + * Two AID keys are special: For 0x7d (enter) the input line + * has to be emitted to the tty and for 0x6d the screen + * needs to be redrawn. + */ + input = NULL; + len = 0; + if (tp->input->string[0] == 0x7d) { + /* Enter: write input to tty. */ + input = tp->input->string + 6; + len = tp->input->len - 6 - rrq->rescnt; + if (tp->inattr != TF_INPUTN) + tty3270_rcl_add(tp, input, len); + if (tp->nr_up > 0) { + tp->nr_up = 0; + tty3270_rebuild_update(tp); + tty3270_update_status(tp); + } + /* Clear input area. */ + tty3270_update_prompt(tp, NULL, 0); + tty3270_set_timer(tp, 1); + } else if (tp->input->string[0] == 0x6d) { + /* Display has been cleared. Redraw. */ + tp->update_flags = TTY_UPDATE_ALL; + tty3270_set_timer(tp, 1); + } + spin_unlock_bh(&tp->view.lock); + + /* Start keyboard reset command. */ + raw3270_request_reset(tp->kreset); + raw3270_request_set_cmd(tp->kreset, TC_WRITE); + raw3270_request_add_data(tp->kreset, &kreset_data, 1); + raw3270_start(&tp->view, tp->kreset); + + while (len-- > 0) + kbd_keycode(tp->kbd, *input++); + /* Emit keycode for AID byte. */ + kbd_keycode(tp->kbd, 256 + tp->input->string[0]); + + raw3270_request_reset(rrq); + xchg(&tp->read, rrq); + raw3270_put_view(&tp->view); +} + +/* + * Read request completion callback. + */ +static void +tty3270_read_callback(struct raw3270_request *rq, void *data) +{ + struct tty3270 *tp = container_of(rq->view, struct tty3270, view); + raw3270_get_view(rq->view); + /* Schedule tasklet to pass input to tty. */ + tasklet_schedule(&tp->readlet); +} + +/* + * Issue a read request. Call with device lock. + */ +static void +tty3270_issue_read(struct tty3270 *tp, int lock) +{ + struct raw3270_request *rrq; + int rc; + + rrq = xchg(&tp->read, 0); + if (!rrq) + /* Read already scheduled. */ + return; + rrq->callback = tty3270_read_callback; + rrq->callback_data = tp; + raw3270_request_set_cmd(rrq, TC_READMOD); + raw3270_request_set_data(rrq, tp->input->string, tp->input->len); + /* Issue the read modified request. */ + if (lock) { + rc = raw3270_start(&tp->view, rrq); + } else + rc = raw3270_start_irq(&tp->view, rrq); + if (rc) { + raw3270_request_reset(rrq); + xchg(&tp->read, rrq); + } +} + +/* + * Hang up the tty + */ +static void +tty3270_hangup_tasklet(struct tty3270 *tp) +{ + tty_port_tty_hangup(&tp->port, true); + raw3270_put_view(&tp->view); +} + +/* + * Switch to the tty view. + */ +static int +tty3270_activate(struct raw3270_view *view) +{ + struct tty3270 *tp = container_of(view, struct tty3270, view); + + tp->update_flags = TTY_UPDATE_ALL; + tty3270_set_timer(tp, 1); + return 0; +} + +static void +tty3270_deactivate(struct raw3270_view *view) +{ + struct tty3270 *tp = container_of(view, struct tty3270, view); + + del_timer(&tp->timer); +} + +static void +tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb) +{ + /* Handle ATTN. Schedule tasklet to read aid. */ + if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { + if (!tp->throttle) + tty3270_issue_read(tp, 0); + else + tp->attn = 1; + } + + if (rq) { + if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { + rq->rc = -EIO; + raw3270_get_view(&tp->view); + tasklet_schedule(&tp->hanglet); + } else { + /* Normal end. Copy residual count. */ + rq->rescnt = irb->scsw.cmd.count; + } + } else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) { + /* Interrupt without an outstanding request -> update all */ + tp->update_flags = TTY_UPDATE_ALL; + tty3270_set_timer(tp, 1); + } +} + +/* + * Allocate tty3270 structure. + */ +static struct tty3270 * +tty3270_alloc_view(void) +{ + struct tty3270 *tp; + int pages; + + tp = kzalloc(sizeof(struct tty3270), GFP_KERNEL); + if (!tp) + goto out_err; + tp->freemem_pages = + kmalloc_array(TTY3270_STRING_PAGES, sizeof(void *), + GFP_KERNEL); + if (!tp->freemem_pages) + goto out_tp; + INIT_LIST_HEAD(&tp->freemem); + INIT_LIST_HEAD(&tp->lines); + INIT_LIST_HEAD(&tp->update); + INIT_LIST_HEAD(&tp->rcl_lines); + tp->rcl_max = 20; + + for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) { + tp->freemem_pages[pages] = (void *) + __get_free_pages(GFP_KERNEL|GFP_DMA, 0); + if (!tp->freemem_pages[pages]) + goto out_pages; + add_string_memory(&tp->freemem, + tp->freemem_pages[pages], PAGE_SIZE); + } + tp->write = raw3270_request_alloc(TTY3270_OUTPUT_BUFFER_SIZE); + if (IS_ERR(tp->write)) + goto out_pages; + tp->read = raw3270_request_alloc(0); + if (IS_ERR(tp->read)) + goto out_write; + tp->kreset = raw3270_request_alloc(1); + if (IS_ERR(tp->kreset)) + goto out_read; + tp->kbd = kbd_alloc(); + if (!tp->kbd) + goto out_reset; + + tty_port_init(&tp->port); + timer_setup(&tp->timer, tty3270_update, 0); + tasklet_init(&tp->readlet, + (void (*)(unsigned long)) tty3270_read_tasklet, + (unsigned long) tp->read); + tasklet_init(&tp->hanglet, + (void (*)(unsigned long)) tty3270_hangup_tasklet, + (unsigned long) tp); + INIT_WORK(&tp->resize_work, tty3270_resize_work); + + return tp; + +out_reset: + raw3270_request_free(tp->kreset); +out_read: + raw3270_request_free(tp->read); +out_write: + raw3270_request_free(tp->write); +out_pages: + while (pages--) + free_pages((unsigned long) tp->freemem_pages[pages], 0); + kfree(tp->freemem_pages); + tty_port_destroy(&tp->port); +out_tp: + kfree(tp); +out_err: + return ERR_PTR(-ENOMEM); +} + +/* + * Free tty3270 structure. + */ +static void +tty3270_free_view(struct tty3270 *tp) +{ + int pages; + + kbd_free(tp->kbd); + raw3270_request_free(tp->kreset); + raw3270_request_free(tp->read); + raw3270_request_free(tp->write); + for (pages = 0; pages < TTY3270_STRING_PAGES; pages++) + free_pages((unsigned long) tp->freemem_pages[pages], 0); + kfree(tp->freemem_pages); + tty_port_destroy(&tp->port); + kfree(tp); +} + +/* + * Allocate tty3270 screen. + */ +static struct tty3270_line * +tty3270_alloc_screen(unsigned int rows, unsigned int cols) +{ + struct tty3270_line *screen; + unsigned long size; + int lines; + + size = sizeof(struct tty3270_line) * (rows - 2); + screen = kzalloc(size, GFP_KERNEL); + if (!screen) + goto out_err; + for (lines = 0; lines < rows - 2; lines++) { + size = sizeof(struct tty3270_cell) * cols; + screen[lines].cells = kzalloc(size, GFP_KERNEL); + if (!screen[lines].cells) + goto out_screen; + } + return screen; +out_screen: + while (lines--) + kfree(screen[lines].cells); + kfree(screen); +out_err: + return ERR_PTR(-ENOMEM); +} + +/* + * Free tty3270 screen. + */ +static void +tty3270_free_screen(struct tty3270_line *screen, unsigned int rows) +{ + int lines; + + for (lines = 0; lines < rows - 2; lines++) + kfree(screen[lines].cells); + kfree(screen); +} + +/* + * Resize tty3270 screen + */ +static void tty3270_resize_work(struct work_struct *work) +{ + struct tty3270 *tp = container_of(work, struct tty3270, resize_work); + struct tty3270_line *screen, *oscreen; + struct tty_struct *tty; + unsigned int orows; + struct winsize ws; + + screen = tty3270_alloc_screen(tp->n_rows, tp->n_cols); + if (IS_ERR(screen)) + return; + /* Switch to new output size */ + spin_lock_bh(&tp->view.lock); + tty3270_blank_screen(tp); + oscreen = tp->screen; + orows = tp->view.rows; + tp->view.model = tp->n_model; + tp->view.rows = tp->n_rows; + tp->view.cols = tp->n_cols; + tp->screen = screen; + free_string(&tp->freemem, tp->prompt); + free_string(&tp->freemem, tp->status); + tty3270_create_prompt(tp); + tty3270_create_status(tp); + while (tp->nr_lines < tp->view.rows - 2) + tty3270_blank_line(tp); + tp->update_flags = TTY_UPDATE_ALL; + spin_unlock_bh(&tp->view.lock); + tty3270_free_screen(oscreen, orows); + tty3270_set_timer(tp, 1); + /* Informat tty layer about new size */ + tty = tty_port_tty_get(&tp->port); + if (!tty) + return; + ws.ws_row = tp->view.rows - 2; + ws.ws_col = tp->view.cols; + tty_do_resize(tty, &ws); + tty_kref_put(tty); +} + +static void +tty3270_resize(struct raw3270_view *view, int model, int rows, int cols) +{ + struct tty3270 *tp = container_of(view, struct tty3270, view); + + if (tp->n_model == model && tp->n_rows == rows && tp->n_cols == cols) + return; + tp->n_model = model; + tp->n_rows = rows; + tp->n_cols = cols; + schedule_work(&tp->resize_work); +} + +/* + * Unlink tty3270 data structure from tty. + */ +static void +tty3270_release(struct raw3270_view *view) +{ + struct tty3270 *tp = container_of(view, struct tty3270, view); + struct tty_struct *tty = tty_port_tty_get(&tp->port); + + if (tty) { + tty->driver_data = NULL; + tty_port_tty_set(&tp->port, NULL); + tty_hangup(tty); + raw3270_put_view(&tp->view); + tty_kref_put(tty); + } +} + +/* + * Free tty3270 data structure + */ +static void +tty3270_free(struct raw3270_view *view) +{ + struct tty3270 *tp = container_of(view, struct tty3270, view); + + del_timer_sync(&tp->timer); + tty3270_free_screen(tp->screen, tp->view.rows); + tty3270_free_view(tp); +} + +/* + * Delayed freeing of tty3270 views. + */ +static void +tty3270_del_views(void) +{ + int i; + + for (i = RAW3270_FIRSTMINOR; i <= tty3270_max_index; i++) { + struct raw3270_view *view = raw3270_find_view(&tty3270_fn, i); + if (!IS_ERR(view)) + raw3270_del_view(view); + } +} + +static struct raw3270_fn tty3270_fn = { + .activate = tty3270_activate, + .deactivate = tty3270_deactivate, + .intv = (void *) tty3270_irq, + .release = tty3270_release, + .free = tty3270_free, + .resize = tty3270_resize +}; + +/* + * This routine is called whenever a 3270 tty is opened first time. + */ +static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty) +{ + struct raw3270_view *view; + struct tty3270 *tp; + int i, rc; + + /* Check if the tty3270 is already there. */ + view = raw3270_find_view(&tty3270_fn, tty->index + RAW3270_FIRSTMINOR); + if (!IS_ERR(view)) { + tp = container_of(view, struct tty3270, view); + tty->driver_data = tp; + tty->winsize.ws_row = tp->view.rows - 2; + tty->winsize.ws_col = tp->view.cols; + tp->port.low_latency = 0; + tp->inattr = TF_INPUT; + goto port_install; + } + if (tty3270_max_index < tty->index + 1) + tty3270_max_index = tty->index + 1; + + /* Allocate tty3270 structure on first open. */ + tp = tty3270_alloc_view(); + if (IS_ERR(tp)) + return PTR_ERR(tp); + + rc = raw3270_add_view(&tp->view, &tty3270_fn, + tty->index + RAW3270_FIRSTMINOR, + RAW3270_VIEW_LOCK_BH); + if (rc) { + tty3270_free_view(tp); + return rc; + } + + tp->screen = tty3270_alloc_screen(tp->view.rows, tp->view.cols); + if (IS_ERR(tp->screen)) { + rc = PTR_ERR(tp->screen); + raw3270_put_view(&tp->view); + raw3270_del_view(&tp->view); + tty3270_free_view(tp); + return rc; + } + + tp->port.low_latency = 0; + tty->winsize.ws_row = tp->view.rows - 2; + tty->winsize.ws_col = tp->view.cols; + + tty3270_create_prompt(tp); + tty3270_create_status(tp); + tty3270_update_status(tp); + + /* Create blank line for every line in the tty output area. */ + for (i = 0; i < tp->view.rows - 2; i++) + tty3270_blank_line(tp); + + tp->kbd->port = &tp->port; + tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty; + tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward; + tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward; + tp->kbd->fn_handler[KVAL(K_CONS)] = tty3270_rcl_backward; + kbd_ascebc(tp->kbd, tp->view.ascebc); + + raw3270_activate_view(&tp->view); + +port_install: + rc = tty_port_install(&tp->port, driver, tty); + if (rc) { + raw3270_put_view(&tp->view); + return rc; + } + + tty->driver_data = tp; + + return 0; +} + +/* + * This routine is called whenever a 3270 tty is opened. + */ +static int +tty3270_open(struct tty_struct *tty, struct file *filp) +{ + struct tty3270 *tp = tty->driver_data; + struct tty_port *port = &tp->port; + + port->count++; + tty_port_tty_set(port, tty); + return 0; +} + +/* + * This routine is called when the 3270 tty is closed. We wait + * for the remaining request to be completed. Then we clean up. + */ +static void +tty3270_close(struct tty_struct *tty, struct file * filp) +{ + struct tty3270 *tp = tty->driver_data; + + if (tty->count > 1) + return; + if (tp) + tty_port_tty_set(&tp->port, NULL); +} + +static void tty3270_cleanup(struct tty_struct *tty) +{ + struct tty3270 *tp = tty->driver_data; + + if (tp) { + tty->driver_data = NULL; + raw3270_put_view(&tp->view); + } +} + +/* + * We always have room. + */ +static int +tty3270_write_room(struct tty_struct *tty) +{ + return INT_MAX; +} + +/* + * Insert character into the screen at the current position with the + * current color and highlight. This function does NOT do cursor movement. + */ +static void tty3270_put_character(struct tty3270 *tp, char ch) +{ + struct tty3270_line *line; + struct tty3270_cell *cell; + + line = tp->screen + tp->cy; + if (line->len <= tp->cx) { + while (line->len < tp->cx) { + cell = line->cells + line->len; + cell->character = tp->view.ascebc[' ']; + cell->highlight = tp->highlight; + cell->f_color = tp->f_color; + line->len++; + } + line->len++; + } + cell = line->cells + tp->cx; + cell->character = tp->view.ascebc[(unsigned int) ch]; + cell->highlight = tp->highlight; + cell->f_color = tp->f_color; +} + +/* + * Convert a tty3270_line to a 3270 data fragment usable for output. + */ +static void +tty3270_convert_line(struct tty3270 *tp, int line_nr) +{ + struct tty3270_line *line; + struct tty3270_cell *cell; + struct string *s, *n; + unsigned char highlight; + unsigned char f_color; + char *cp; + int flen, i; + + /* Determine how long the fragment will be. */ + flen = 3; /* Prefix (TO_SBA). */ + line = tp->screen + line_nr; + flen += line->len; + highlight = TAX_RESET; + f_color = TAC_RESET; + for (i = 0, cell = line->cells; i < line->len; i++, cell++) { + if (cell->highlight != highlight) { + flen += 3; /* TO_SA to switch highlight. */ + highlight = cell->highlight; + } + if (cell->f_color != f_color) { + flen += 3; /* TO_SA to switch color. */ + f_color = cell->f_color; + } + } + if (highlight != TAX_RESET) + flen += 3; /* TO_SA to reset hightlight. */ + if (f_color != TAC_RESET) + flen += 3; /* TO_SA to reset color. */ + if (line->len < tp->view.cols) + flen += 4; /* Postfix (TO_RA). */ + + /* Find the line in the list. */ + i = tp->view.rows - 2 - line_nr; + list_for_each_entry_reverse(s, &tp->lines, list) + if (--i <= 0) + break; + /* + * Check if the line needs to get reallocated. + */ + if (s->len != flen) { + /* Reallocate string. */ + n = tty3270_alloc_string(tp, flen); + list_add(&n->list, &s->list); + list_del_init(&s->list); + if (!list_empty(&s->update)) + list_del_init(&s->update); + free_string(&tp->freemem, s); + s = n; + } + + /* Write 3270 data fragment. */ + cp = s->string; + *cp++ = TO_SBA; + *cp++ = 0; + *cp++ = 0; + + highlight = TAX_RESET; + f_color = TAC_RESET; + for (i = 0, cell = line->cells; i < line->len; i++, cell++) { + if (cell->highlight != highlight) { + *cp++ = TO_SA; + *cp++ = TAT_EXTHI; + *cp++ = cell->highlight; + highlight = cell->highlight; + } + if (cell->f_color != f_color) { + *cp++ = TO_SA; + *cp++ = TAT_COLOR; + *cp++ = cell->f_color; + f_color = cell->f_color; + } + *cp++ = cell->character; + } + if (highlight != TAX_RESET) { + *cp++ = TO_SA; + *cp++ = TAT_EXTHI; + *cp++ = TAX_RESET; + } + if (f_color != TAC_RESET) { + *cp++ = TO_SA; + *cp++ = TAT_COLOR; + *cp++ = TAC_RESET; + } + if (line->len < tp->view.cols) { + *cp++ = TO_RA; + *cp++ = 0; + *cp++ = 0; + *cp++ = 0; + } + + if (tp->nr_up + line_nr < tp->view.rows - 2) { + /* Line is currently visible on screen. */ + tty3270_update_string(tp, s, line_nr); + /* Add line to update list. */ + if (list_empty(&s->update)) { + list_add_tail(&s->update, &tp->update); + tp->update_flags |= TTY_UPDATE_LIST; + } + } +} + +/* + * Do carriage return. + */ +static void +tty3270_cr(struct tty3270 *tp) +{ + tp->cx = 0; +} + +/* + * Do line feed. + */ +static void +tty3270_lf(struct tty3270 *tp) +{ + struct tty3270_line temp; + int i; + + tty3270_convert_line(tp, tp->cy); + if (tp->cy < tp->view.rows - 3) { + tp->cy++; + return; + } + /* Last line just filled up. Add new, blank line. */ + tty3270_blank_line(tp); + temp = tp->screen[0]; + temp.len = 0; + for (i = 0; i < tp->view.rows - 3; i++) + tp->screen[i] = tp->screen[i+1]; + tp->screen[tp->view.rows - 3] = temp; + tty3270_rebuild_update(tp); +} + +static void +tty3270_ri(struct tty3270 *tp) +{ + if (tp->cy > 0) { + tty3270_convert_line(tp, tp->cy); + tp->cy--; + } +} + +/* + * Insert characters at current position. + */ +static void +tty3270_insert_characters(struct tty3270 *tp, int n) +{ + struct tty3270_line *line; + int k; + + line = tp->screen + tp->cy; + while (line->len < tp->cx) { + line->cells[line->len].character = tp->view.ascebc[' ']; + line->cells[line->len].highlight = TAX_RESET; + line->cells[line->len].f_color = TAC_RESET; + line->len++; + } + if (n > tp->view.cols - tp->cx) + n = tp->view.cols - tp->cx; + k = min_t(int, line->len - tp->cx, tp->view.cols - tp->cx - n); + while (k--) + line->cells[tp->cx + n + k] = line->cells[tp->cx + k]; + line->len += n; + if (line->len > tp->view.cols) + line->len = tp->view.cols; + while (n-- > 0) { + line->cells[tp->cx + n].character = tp->view.ascebc[' ']; + line->cells[tp->cx + n].highlight = tp->highlight; + line->cells[tp->cx + n].f_color = tp->f_color; + } +} + +/* + * Delete characters at current position. + */ +static void +tty3270_delete_characters(struct tty3270 *tp, int n) +{ + struct tty3270_line *line; + int i; + + line = tp->screen + tp->cy; + if (line->len <= tp->cx) + return; + if (line->len - tp->cx <= n) { + line->len = tp->cx; + return; + } + for (i = tp->cx; i + n < line->len; i++) + line->cells[i] = line->cells[i + n]; + line->len -= n; +} + +/* + * Erase characters at current position. + */ +static void +tty3270_erase_characters(struct tty3270 *tp, int n) +{ + struct tty3270_line *line; + struct tty3270_cell *cell; + + line = tp->screen + tp->cy; + while (line->len > tp->cx && n-- > 0) { + cell = line->cells + tp->cx++; + cell->character = ' '; + cell->highlight = TAX_RESET; + cell->f_color = TAC_RESET; + } + tp->cx += n; + tp->cx = min_t(int, tp->cx, tp->view.cols - 1); +} + +/* + * Erase line, 3 different cases: + * Esc [ 0 K Erase from current position to end of line inclusive + * Esc [ 1 K Erase from beginning of line to current position inclusive + * Esc [ 2 K Erase entire line (without moving cursor) + */ +static void +tty3270_erase_line(struct tty3270 *tp, int mode) +{ + struct tty3270_line *line; + struct tty3270_cell *cell; + int i; + + line = tp->screen + tp->cy; + if (mode == 0) + line->len = tp->cx; + else if (mode == 1) { + for (i = 0; i < tp->cx; i++) { + cell = line->cells + i; + cell->character = ' '; + cell->highlight = TAX_RESET; + cell->f_color = TAC_RESET; + } + if (line->len <= tp->cx) + line->len = tp->cx + 1; + } else if (mode == 2) + line->len = 0; + tty3270_convert_line(tp, tp->cy); +} + +/* + * Erase display, 3 different cases: + * Esc [ 0 J Erase from current position to bottom of screen inclusive + * Esc [ 1 J Erase from top of screen to current position inclusive + * Esc [ 2 J Erase entire screen (without moving the cursor) + */ +static void +tty3270_erase_display(struct tty3270 *tp, int mode) +{ + int i; + + if (mode == 0) { + tty3270_erase_line(tp, 0); + for (i = tp->cy + 1; i < tp->view.rows - 2; i++) { + tp->screen[i].len = 0; + tty3270_convert_line(tp, i); + } + } else if (mode == 1) { + for (i = 0; i < tp->cy; i++) { + tp->screen[i].len = 0; + tty3270_convert_line(tp, i); + } + tty3270_erase_line(tp, 1); + } else if (mode == 2) { + for (i = 0; i < tp->view.rows - 2; i++) { + tp->screen[i].len = 0; + tty3270_convert_line(tp, i); + } + } + tty3270_rebuild_update(tp); +} + +/* + * Set attributes found in an escape sequence. + * Esc [ ; ; ... m + */ +static void +tty3270_set_attributes(struct tty3270 *tp) +{ + static unsigned char f_colors[] = { + TAC_DEFAULT, TAC_RED, TAC_GREEN, TAC_YELLOW, TAC_BLUE, + TAC_PINK, TAC_TURQ, TAC_WHITE, 0, TAC_DEFAULT + }; + int i, attr; + + for (i = 0; i <= tp->esc_npar; i++) { + attr = tp->esc_par[i]; + switch (attr) { + case 0: /* Reset */ + tp->highlight = TAX_RESET; + tp->f_color = TAC_RESET; + break; + /* Highlight. */ + case 4: /* Start underlining. */ + tp->highlight = TAX_UNDER; + break; + case 5: /* Start blink. */ + tp->highlight = TAX_BLINK; + break; + case 7: /* Start reverse. */ + tp->highlight = TAX_REVER; + break; + case 24: /* End underlining */ + if (tp->highlight == TAX_UNDER) + tp->highlight = TAX_RESET; + break; + case 25: /* End blink. */ + if (tp->highlight == TAX_BLINK) + tp->highlight = TAX_RESET; + break; + case 27: /* End reverse. */ + if (tp->highlight == TAX_REVER) + tp->highlight = TAX_RESET; + break; + /* Foreground color. */ + case 30: /* Black */ + case 31: /* Red */ + case 32: /* Green */ + case 33: /* Yellow */ + case 34: /* Blue */ + case 35: /* Magenta */ + case 36: /* Cyan */ + case 37: /* White */ + case 39: /* Black */ + tp->f_color = f_colors[attr - 30]; + break; + } + } +} + +static inline int +tty3270_getpar(struct tty3270 *tp, int ix) +{ + return (tp->esc_par[ix] > 0) ? tp->esc_par[ix] : 1; +} + +static void +tty3270_goto_xy(struct tty3270 *tp, int cx, int cy) +{ + int max_cx = max(0, cx); + int max_cy = max(0, cy); + + tp->cx = min_t(int, tp->view.cols - 1, max_cx); + cy = min_t(int, tp->view.rows - 3, max_cy); + if (cy != tp->cy) { + tty3270_convert_line(tp, tp->cy); + tp->cy = cy; + } +} + +/* + * Process escape sequences. Known sequences: + * Esc 7 Save Cursor Position + * Esc 8 Restore Cursor Position + * Esc [ Pn ; Pn ; .. m Set attributes + * Esc [ Pn ; Pn H Cursor Position + * Esc [ Pn ; Pn f Cursor Position + * Esc [ Pn A Cursor Up + * Esc [ Pn B Cursor Down + * Esc [ Pn C Cursor Forward + * Esc [ Pn D Cursor Backward + * Esc [ Pn G Cursor Horizontal Absolute + * Esc [ Pn X Erase Characters + * Esc [ Ps J Erase in Display + * Esc [ Ps K Erase in Line + * // FIXME: add all the new ones. + * + * Pn is a numeric parameter, a string of zero or more decimal digits. + * Ps is a selective parameter. + */ +static void +tty3270_escape_sequence(struct tty3270 *tp, char ch) +{ + enum { ESnormal, ESesc, ESsquare, ESgetpars }; + + if (tp->esc_state == ESnormal) { + if (ch == 0x1b) + /* Starting new escape sequence. */ + tp->esc_state = ESesc; + return; + } + if (tp->esc_state == ESesc) { + tp->esc_state = ESnormal; + switch (ch) { + case '[': + tp->esc_state = ESsquare; + break; + case 'E': + tty3270_cr(tp); + tty3270_lf(tp); + break; + case 'M': + tty3270_ri(tp); + break; + case 'D': + tty3270_lf(tp); + break; + case 'Z': /* Respond ID. */ + kbd_puts_queue(&tp->port, "\033[?6c"); + break; + case '7': /* Save cursor position. */ + tp->saved_cx = tp->cx; + tp->saved_cy = tp->cy; + tp->saved_highlight = tp->highlight; + tp->saved_f_color = tp->f_color; + break; + case '8': /* Restore cursor position. */ + tty3270_convert_line(tp, tp->cy); + tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy); + tp->highlight = tp->saved_highlight; + tp->f_color = tp->saved_f_color; + break; + case 'c': /* Reset terminal. */ + tp->cx = tp->saved_cx = 0; + tp->cy = tp->saved_cy = 0; + tp->highlight = tp->saved_highlight = TAX_RESET; + tp->f_color = tp->saved_f_color = TAC_RESET; + tty3270_erase_display(tp, 2); + break; + } + return; + } + if (tp->esc_state == ESsquare) { + tp->esc_state = ESgetpars; + memset(tp->esc_par, 0, sizeof(tp->esc_par)); + tp->esc_npar = 0; + tp->esc_ques = (ch == '?'); + if (tp->esc_ques) + return; + } + if (tp->esc_state == ESgetpars) { + if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) { + tp->esc_npar++; + return; + } + if (ch >= '0' && ch <= '9') { + tp->esc_par[tp->esc_npar] *= 10; + tp->esc_par[tp->esc_npar] += ch - '0'; + return; + } + } + tp->esc_state = ESnormal; + if (ch == 'n' && !tp->esc_ques) { + if (tp->esc_par[0] == 5) /* Status report. */ + kbd_puts_queue(&tp->port, "\033[0n"); + else if (tp->esc_par[0] == 6) { /* Cursor report. */ + char buf[40]; + sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1); + kbd_puts_queue(&tp->port, buf); + } + return; + } + if (tp->esc_ques) + return; + switch (ch) { + case 'm': + tty3270_set_attributes(tp); + break; + case 'H': /* Set cursor position. */ + case 'f': + tty3270_goto_xy(tp, tty3270_getpar(tp, 1) - 1, + tty3270_getpar(tp, 0) - 1); + break; + case 'd': /* Set y position. */ + tty3270_goto_xy(tp, tp->cx, tty3270_getpar(tp, 0) - 1); + break; + case 'A': /* Cursor up. */ + case 'F': + tty3270_goto_xy(tp, tp->cx, tp->cy - tty3270_getpar(tp, 0)); + break; + case 'B': /* Cursor down. */ + case 'e': + case 'E': + tty3270_goto_xy(tp, tp->cx, tp->cy + tty3270_getpar(tp, 0)); + break; + case 'C': /* Cursor forward. */ + case 'a': + tty3270_goto_xy(tp, tp->cx + tty3270_getpar(tp, 0), tp->cy); + break; + case 'D': /* Cursor backward. */ + tty3270_goto_xy(tp, tp->cx - tty3270_getpar(tp, 0), tp->cy); + break; + case 'G': /* Set x position. */ + case '`': + tty3270_goto_xy(tp, tty3270_getpar(tp, 0), tp->cy); + break; + case 'X': /* Erase Characters. */ + tty3270_erase_characters(tp, tty3270_getpar(tp, 0)); + break; + case 'J': /* Erase display. */ + tty3270_erase_display(tp, tp->esc_par[0]); + break; + case 'K': /* Erase line. */ + tty3270_erase_line(tp, tp->esc_par[0]); + break; + case 'P': /* Delete characters. */ + tty3270_delete_characters(tp, tty3270_getpar(tp, 0)); + break; + case '@': /* Insert characters. */ + tty3270_insert_characters(tp, tty3270_getpar(tp, 0)); + break; + case 's': /* Save cursor position. */ + tp->saved_cx = tp->cx; + tp->saved_cy = tp->cy; + tp->saved_highlight = tp->highlight; + tp->saved_f_color = tp->f_color; + break; + case 'u': /* Restore cursor position. */ + tty3270_convert_line(tp, tp->cy); + tty3270_goto_xy(tp, tp->saved_cx, tp->saved_cy); + tp->highlight = tp->saved_highlight; + tp->f_color = tp->saved_f_color; + break; + } +} + +/* + * String write routine for 3270 ttys + */ +static void +tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty, + const unsigned char *buf, int count) +{ + int i_msg, i; + + spin_lock_bh(&tp->view.lock); + for (i_msg = 0; !tty->stopped && i_msg < count; i_msg++) { + if (tp->esc_state != 0) { + /* Continue escape sequence. */ + tty3270_escape_sequence(tp, buf[i_msg]); + continue; + } + + switch (buf[i_msg]) { + case 0x07: /* '\a' -- Alarm */ + tp->wcc |= TW_PLUSALARM; + break; + case 0x08: /* Backspace. */ + if (tp->cx > 0) { + tp->cx--; + tty3270_put_character(tp, ' '); + } + break; + case 0x09: /* '\t' -- Tabulate */ + for (i = tp->cx % 8; i < 8; i++) { + if (tp->cx >= tp->view.cols) { + tty3270_cr(tp); + tty3270_lf(tp); + break; + } + tty3270_put_character(tp, ' '); + tp->cx++; + } + break; + case 0x0a: /* '\n' -- New Line */ + tty3270_cr(tp); + tty3270_lf(tp); + break; + case 0x0c: /* '\f' -- Form Feed */ + tty3270_erase_display(tp, 2); + tp->cx = tp->cy = 0; + break; + case 0x0d: /* '\r' -- Carriage Return */ + tp->cx = 0; + break; + case 0x0f: /* SuSE "exit alternate mode" */ + break; + case 0x1b: /* Start escape sequence. */ + tty3270_escape_sequence(tp, buf[i_msg]); + break; + default: /* Insert normal character. */ + if (tp->cx >= tp->view.cols) { + tty3270_cr(tp); + tty3270_lf(tp); + } + tty3270_put_character(tp, buf[i_msg]); + tp->cx++; + break; + } + } + /* Convert current line to 3270 data fragment. */ + tty3270_convert_line(tp, tp->cy); + + /* Setup timer to update display after 1/10 second */ + if (!timer_pending(&tp->timer)) + tty3270_set_timer(tp, HZ/10); + + spin_unlock_bh(&tp->view.lock); +} + +/* + * String write routine for 3270 ttys + */ +static int +tty3270_write(struct tty_struct * tty, + const unsigned char *buf, int count) +{ + struct tty3270 *tp; + + tp = tty->driver_data; + if (!tp) + return 0; + if (tp->char_count > 0) { + tty3270_do_write(tp, tty, tp->char_buf, tp->char_count); + tp->char_count = 0; + } + tty3270_do_write(tp, tty, buf, count); + return count; +} + +/* + * Put single characters to the ttys character buffer + */ +static int tty3270_put_char(struct tty_struct *tty, unsigned char ch) +{ + struct tty3270 *tp; + + tp = tty->driver_data; + if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE) + return 0; + tp->char_buf[tp->char_count++] = ch; + return 1; +} + +/* + * Flush all characters from the ttys characeter buffer put there + * by tty3270_put_char. + */ +static void +tty3270_flush_chars(struct tty_struct *tty) +{ + struct tty3270 *tp; + + tp = tty->driver_data; + if (!tp) + return; + if (tp->char_count > 0) { + tty3270_do_write(tp, tty, tp->char_buf, tp->char_count); + tp->char_count = 0; + } +} + +/* + * Returns the number of characters in the output buffer. This is + * used in tty_wait_until_sent to wait until all characters have + * appeared on the screen. + */ +static int +tty3270_chars_in_buffer(struct tty_struct *tty) +{ + return 0; +} + +static void +tty3270_flush_buffer(struct tty_struct *tty) +{ +} + +/* + * Check for visible/invisible input switches + */ +static void +tty3270_set_termios(struct tty_struct *tty, struct ktermios *old) +{ + struct tty3270 *tp; + int new; + + tp = tty->driver_data; + if (!tp) + return; + spin_lock_bh(&tp->view.lock); + if (L_ICANON(tty)) { + new = L_ECHO(tty) ? TF_INPUT: TF_INPUTN; + if (new != tp->inattr) { + tp->inattr = new; + tty3270_update_prompt(tp, NULL, 0); + tty3270_set_timer(tp, 1); + } + } + spin_unlock_bh(&tp->view.lock); +} + +/* + * Disable reading from a 3270 tty + */ +static void +tty3270_throttle(struct tty_struct * tty) +{ + struct tty3270 *tp; + + tp = tty->driver_data; + if (!tp) + return; + tp->throttle = 1; +} + +/* + * Enable reading from a 3270 tty + */ +static void +tty3270_unthrottle(struct tty_struct * tty) +{ + struct tty3270 *tp; + + tp = tty->driver_data; + if (!tp) + return; + tp->throttle = 0; + if (tp->attn) + tty3270_issue_read(tp, 1); +} + +/* + * Hang up the tty device. + */ +static void +tty3270_hangup(struct tty_struct *tty) +{ + struct tty3270 *tp; + + tp = tty->driver_data; + if (!tp) + return; + spin_lock_bh(&tp->view.lock); + tp->cx = tp->saved_cx = 0; + tp->cy = tp->saved_cy = 0; + tp->highlight = tp->saved_highlight = TAX_RESET; + tp->f_color = tp->saved_f_color = TAC_RESET; + tty3270_blank_screen(tp); + while (tp->nr_lines < tp->view.rows - 2) + tty3270_blank_line(tp); + tp->update_flags = TTY_UPDATE_ALL; + spin_unlock_bh(&tp->view.lock); + tty3270_set_timer(tp, 1); +} + +static void +tty3270_wait_until_sent(struct tty_struct *tty, int timeout) +{ +} + +static int tty3270_ioctl(struct tty_struct *tty, unsigned int cmd, + unsigned long arg) +{ + struct tty3270 *tp; + + tp = tty->driver_data; + if (!tp) + return -ENODEV; + if (tty_io_error(tty)) + return -EIO; + return kbd_ioctl(tp->kbd, cmd, arg); +} + +#ifdef CONFIG_COMPAT +static long tty3270_compat_ioctl(struct tty_struct *tty, + unsigned int cmd, unsigned long arg) +{ + struct tty3270 *tp; + + tp = tty->driver_data; + if (!tp) + return -ENODEV; + if (tty_io_error(tty)) + return -EIO; + return kbd_ioctl(tp->kbd, cmd, (unsigned long)compat_ptr(arg)); +} +#endif + +static const struct tty_operations tty3270_ops = { + .install = tty3270_install, + .cleanup = tty3270_cleanup, + .open = tty3270_open, + .close = tty3270_close, + .write = tty3270_write, + .put_char = tty3270_put_char, + .flush_chars = tty3270_flush_chars, + .write_room = tty3270_write_room, + .chars_in_buffer = tty3270_chars_in_buffer, + .flush_buffer = tty3270_flush_buffer, + .throttle = tty3270_throttle, + .unthrottle = tty3270_unthrottle, + .hangup = tty3270_hangup, + .wait_until_sent = tty3270_wait_until_sent, + .ioctl = tty3270_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = tty3270_compat_ioctl, +#endif + .set_termios = tty3270_set_termios +}; + +static void tty3270_create_cb(int minor) +{ + tty_register_device(tty3270_driver, minor - RAW3270_FIRSTMINOR, NULL); +} + +static void tty3270_destroy_cb(int minor) +{ + tty_unregister_device(tty3270_driver, minor - RAW3270_FIRSTMINOR); +} + +static struct raw3270_notifier tty3270_notifier = +{ + .create = tty3270_create_cb, + .destroy = tty3270_destroy_cb, +}; + +/* + * 3270 tty registration code called from tty_init(). + * Most kernel services (incl. kmalloc) are available at this poimt. + */ +static int __init tty3270_init(void) +{ + struct tty_driver *driver; + int ret; + + driver = tty_alloc_driver(RAW3270_MAXDEVS, + TTY_DRIVER_REAL_RAW | + TTY_DRIVER_DYNAMIC_DEV | + TTY_DRIVER_RESET_TERMIOS); + if (IS_ERR(driver)) + return PTR_ERR(driver); + + /* + * Initialize the tty_driver structure + * Entries in tty3270_driver that are NOT initialized: + * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc + */ + driver->driver_name = "tty3270"; + driver->name = "3270/tty"; + driver->major = IBM_TTY3270_MAJOR; + driver->minor_start = RAW3270_FIRSTMINOR; + driver->name_base = RAW3270_FIRSTMINOR; + driver->type = TTY_DRIVER_TYPE_SYSTEM; + driver->subtype = SYSTEM_TYPE_TTY; + driver->init_termios = tty_std_termios; + tty_set_operations(driver, &tty3270_ops); + ret = tty_register_driver(driver); + if (ret) { + put_tty_driver(driver); + return ret; + } + tty3270_driver = driver; + raw3270_register_notifier(&tty3270_notifier); + return 0; +} + +static void __exit +tty3270_exit(void) +{ + struct tty_driver *driver; + + raw3270_unregister_notifier(&tty3270_notifier); + driver = tty3270_driver; + tty3270_driver = NULL; + tty_unregister_driver(driver); + put_tty_driver(driver); + tty3270_del_views(); +} + +MODULE_LICENSE("GPL"); +MODULE_ALIAS_CHARDEV_MAJOR(IBM_TTY3270_MAJOR); + +module_init(tty3270_init); +module_exit(tty3270_exit); diff --git a/drivers/s390/char/tty3270.h b/drivers/s390/char/tty3270.h new file mode 100644 index 000000000..52ceed6f8 --- /dev/null +++ b/drivers/s390/char/tty3270.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2007 + * + */ + +#ifndef __DRIVERS_S390_CHAR_TTY3270_H +#define __DRIVERS_S390_CHAR_TTY3270_H + +#include +#include + +extern struct tty_driver *tty3270_driver; + +#endif /* __DRIVERS_S390_CHAR_TTY3270_H */ diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c new file mode 100644 index 000000000..0fa1b6b14 --- /dev/null +++ b/drivers/s390/char/vmcp.c @@ -0,0 +1,274 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2004, 2010 + * Interface implementation for communication with the z/VM control program + * + * Author(s): Christian Borntraeger + * + * z/VMs CP offers the possibility to issue commands via the diagnose code 8 + * this driver implements a character device that issues these commands and + * returns the answer of CP. + * + * The idea of this driver is based on cpint from Neale Ferguson and #CP in CMS + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct vmcp_session { + char *response; + unsigned int bufsize; + unsigned int cma_alloc : 1; + int resp_size; + int resp_code; + struct mutex mutex; +}; + +static debug_info_t *vmcp_debug; + +static unsigned long vmcp_cma_size __initdata = CONFIG_VMCP_CMA_SIZE * 1024 * 1024; +static struct cma *vmcp_cma; + +static int __init early_parse_vmcp_cma(char *p) +{ + vmcp_cma_size = ALIGN(memparse(p, NULL), PAGE_SIZE); + return 0; +} +early_param("vmcp_cma", early_parse_vmcp_cma); + +void __init vmcp_cma_reserve(void) +{ + if (!MACHINE_IS_VM) + return; + cma_declare_contiguous(0, vmcp_cma_size, 0, 0, 0, false, "vmcp", &vmcp_cma); +} + +static void vmcp_response_alloc(struct vmcp_session *session) +{ + struct page *page = NULL; + int nr_pages, order; + + order = get_order(session->bufsize); + nr_pages = ALIGN(session->bufsize, PAGE_SIZE) >> PAGE_SHIFT; + /* + * For anything below order 3 allocations rely on the buddy + * allocator. If such low-order allocations can't be handled + * anymore the system won't work anyway. + */ + if (order > 2) + page = cma_alloc(vmcp_cma, nr_pages, 0, false); + if (page) { + session->response = (char *)page_to_phys(page); + session->cma_alloc = 1; + return; + } + session->response = (char *)__get_free_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL, order); +} + +static void vmcp_response_free(struct vmcp_session *session) +{ + int nr_pages, order; + struct page *page; + + if (!session->response) + return; + order = get_order(session->bufsize); + nr_pages = ALIGN(session->bufsize, PAGE_SIZE) >> PAGE_SHIFT; + if (session->cma_alloc) { + page = phys_to_page((unsigned long)session->response); + cma_release(vmcp_cma, page, nr_pages); + session->cma_alloc = 0; + } else { + free_pages((unsigned long)session->response, order); + } + session->response = NULL; +} + +static int vmcp_open(struct inode *inode, struct file *file) +{ + struct vmcp_session *session; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + session = kmalloc(sizeof(*session), GFP_KERNEL); + if (!session) + return -ENOMEM; + + session->bufsize = PAGE_SIZE; + session->response = NULL; + session->resp_size = 0; + mutex_init(&session->mutex); + file->private_data = session; + return nonseekable_open(inode, file); +} + +static int vmcp_release(struct inode *inode, struct file *file) +{ + struct vmcp_session *session; + + session = file->private_data; + file->private_data = NULL; + vmcp_response_free(session); + kfree(session); + return 0; +} + +static ssize_t +vmcp_read(struct file *file, char __user *buff, size_t count, loff_t *ppos) +{ + ssize_t ret; + size_t size; + struct vmcp_session *session; + + session = file->private_data; + if (mutex_lock_interruptible(&session->mutex)) + return -ERESTARTSYS; + if (!session->response) { + mutex_unlock(&session->mutex); + return 0; + } + size = min_t(size_t, session->resp_size, session->bufsize); + ret = simple_read_from_buffer(buff, count, ppos, + session->response, size); + + mutex_unlock(&session->mutex); + + return ret; +} + +static ssize_t +vmcp_write(struct file *file, const char __user *buff, size_t count, + loff_t *ppos) +{ + char *cmd; + struct vmcp_session *session; + + if (count > 240) + return -EINVAL; + cmd = memdup_user_nul(buff, count); + if (IS_ERR(cmd)) + return PTR_ERR(cmd); + session = file->private_data; + if (mutex_lock_interruptible(&session->mutex)) { + kfree(cmd); + return -ERESTARTSYS; + } + if (!session->response) + vmcp_response_alloc(session); + if (!session->response) { + mutex_unlock(&session->mutex); + kfree(cmd); + return -ENOMEM; + } + debug_text_event(vmcp_debug, 1, cmd); + session->resp_size = cpcmd(cmd, session->response, session->bufsize, + &session->resp_code); + mutex_unlock(&session->mutex); + kfree(cmd); + *ppos = 0; /* reset the file pointer after a command */ + return count; +} + + +/* + * These ioctls are available, as the semantics of the diagnose 8 call + * does not fit very well into a Linux call. Diagnose X'08' is described in + * CP Programming Services SC24-6084-00 + * + * VMCP_GETCODE: gives the CP return code back to user space + * VMCP_SETBUF: sets the response buffer for the next write call. diagnose 8 + * expects adjacent pages in real storage and to make matters worse, we + * dont know the size of the response. Therefore we default to PAGESIZE and + * let userspace to change the response size, if userspace expects a bigger + * response + */ +static long vmcp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct vmcp_session *session; + int ret = -ENOTTY; + int __user *argp; + + session = file->private_data; + if (is_compat_task()) + argp = compat_ptr(arg); + else + argp = (int __user *)arg; + if (mutex_lock_interruptible(&session->mutex)) + return -ERESTARTSYS; + switch (cmd) { + case VMCP_GETCODE: + ret = put_user(session->resp_code, argp); + break; + case VMCP_SETBUF: + vmcp_response_free(session); + ret = get_user(session->bufsize, argp); + if (ret) + session->bufsize = PAGE_SIZE; + if (!session->bufsize || get_order(session->bufsize) > 8) { + session->bufsize = PAGE_SIZE; + ret = -EINVAL; + } + break; + case VMCP_GETSIZE: + ret = put_user(session->resp_size, argp); + break; + default: + break; + } + mutex_unlock(&session->mutex); + return ret; +} + +static const struct file_operations vmcp_fops = { + .owner = THIS_MODULE, + .open = vmcp_open, + .release = vmcp_release, + .read = vmcp_read, + .write = vmcp_write, + .unlocked_ioctl = vmcp_ioctl, + .compat_ioctl = vmcp_ioctl, + .llseek = no_llseek, +}; + +static struct miscdevice vmcp_dev = { + .name = "vmcp", + .minor = MISC_DYNAMIC_MINOR, + .fops = &vmcp_fops, +}; + +static int __init vmcp_init(void) +{ + int ret; + + if (!MACHINE_IS_VM) + return 0; + + vmcp_debug = debug_register("vmcp", 1, 1, 240); + if (!vmcp_debug) + return -ENOMEM; + + ret = debug_register_view(vmcp_debug, &debug_hex_ascii_view); + if (ret) { + debug_unregister(vmcp_debug); + return ret; + } + + ret = misc_register(&vmcp_dev); + if (ret) + debug_unregister(vmcp_debug); + return ret; +} +device_initcall(vmcp_init); diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c new file mode 100644 index 000000000..069b9ef08 --- /dev/null +++ b/drivers/s390/char/vmlogrdr.c @@ -0,0 +1,902 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * character device driver for reading z/VM system service records + * + * + * Copyright IBM Corp. 2004, 2009 + * character device driver for reading z/VM system service records, + * Version 1.0 + * Author(s): Xenia Tkatschow + * Stefan Weinhuber + * + */ + +#define KMSG_COMPONENT "vmlogrdr" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +MODULE_AUTHOR + ("(C) 2004 IBM Corporation by Xenia Tkatschow (xenia@us.ibm.com)\n" + " Stefan Weinhuber (wein@de.ibm.com)"); +MODULE_DESCRIPTION ("Character device driver for reading z/VM " + "system service records."); +MODULE_LICENSE("GPL"); + + +/* + * The size of the buffer for iucv data transfer is one page, + * but in addition to the data we read from iucv we also + * place an integer and some characters into that buffer, + * so the maximum size for record data is a little less then + * one page. + */ +#define NET_BUFFER_SIZE (PAGE_SIZE - sizeof(int) - sizeof(FENCE)) + +/* + * The elements that are concurrently accessed by bottom halves are + * connection_established, iucv_path_severed, local_interrupt_buffer + * and receive_ready. The first three can be protected by + * priv_lock. receive_ready is atomic, so it can be incremented and + * decremented without holding a lock. + * The variable dev_in_use needs to be protected by the lock, since + * it's a flag used by open to make sure that the device is opened only + * by one user at the same time. + */ +struct vmlogrdr_priv_t { + char system_service[8]; + char internal_name[8]; + char recording_name[8]; + struct iucv_path *path; + int connection_established; + int iucv_path_severed; + struct iucv_message local_interrupt_buffer; + atomic_t receive_ready; + int minor_num; + char * buffer; + char * current_position; + int remaining; + ulong residual_length; + int buffer_free; + int dev_in_use; /* 1: already opened, 0: not opened*/ + spinlock_t priv_lock; + struct device *device; + struct device *class_device; + int autorecording; + int autopurge; +}; + + +/* + * File operation structure for vmlogrdr devices + */ +static int vmlogrdr_open(struct inode *, struct file *); +static int vmlogrdr_release(struct inode *, struct file *); +static ssize_t vmlogrdr_read (struct file *filp, char __user *data, + size_t count, loff_t * ppos); + +static const struct file_operations vmlogrdr_fops = { + .owner = THIS_MODULE, + .open = vmlogrdr_open, + .release = vmlogrdr_release, + .read = vmlogrdr_read, + .llseek = no_llseek, +}; + + +static void vmlogrdr_iucv_path_complete(struct iucv_path *, u8 *ipuser); +static void vmlogrdr_iucv_path_severed(struct iucv_path *, u8 *ipuser); +static void vmlogrdr_iucv_message_pending(struct iucv_path *, + struct iucv_message *); + + +static struct iucv_handler vmlogrdr_iucv_handler = { + .path_complete = vmlogrdr_iucv_path_complete, + .path_severed = vmlogrdr_iucv_path_severed, + .message_pending = vmlogrdr_iucv_message_pending, +}; + + +static DECLARE_WAIT_QUEUE_HEAD(conn_wait_queue); +static DECLARE_WAIT_QUEUE_HEAD(read_wait_queue); + +/* + * pointer to system service private structure + * minor number 0 --> logrec + * minor number 1 --> account + * minor number 2 --> symptom + */ + +static struct vmlogrdr_priv_t sys_ser[] = { + { .system_service = "*LOGREC ", + .internal_name = "logrec", + .recording_name = "EREP", + .minor_num = 0, + .buffer_free = 1, + .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[0].priv_lock), + .autorecording = 1, + .autopurge = 1, + }, + { .system_service = "*ACCOUNT", + .internal_name = "account", + .recording_name = "ACCOUNT", + .minor_num = 1, + .buffer_free = 1, + .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[1].priv_lock), + .autorecording = 1, + .autopurge = 1, + }, + { .system_service = "*SYMPTOM", + .internal_name = "symptom", + .recording_name = "SYMPTOM", + .minor_num = 2, + .buffer_free = 1, + .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[2].priv_lock), + .autorecording = 1, + .autopurge = 1, + } +}; + +#define MAXMINOR (sizeof(sys_ser)/sizeof(struct vmlogrdr_priv_t)) + +static char FENCE[] = {"EOR"}; +static int vmlogrdr_major = 0; +static struct cdev *vmlogrdr_cdev = NULL; +static int recording_class_AB; + + +static void vmlogrdr_iucv_path_complete(struct iucv_path *path, u8 *ipuser) +{ + struct vmlogrdr_priv_t * logptr = path->private; + + spin_lock(&logptr->priv_lock); + logptr->connection_established = 1; + spin_unlock(&logptr->priv_lock); + wake_up(&conn_wait_queue); +} + + +static void vmlogrdr_iucv_path_severed(struct iucv_path *path, u8 *ipuser) +{ + struct vmlogrdr_priv_t * logptr = path->private; + u8 reason = (u8) ipuser[8]; + + pr_err("vmlogrdr: connection severed with reason %i\n", reason); + + iucv_path_sever(path, NULL); + kfree(path); + logptr->path = NULL; + + spin_lock(&logptr->priv_lock); + logptr->connection_established = 0; + logptr->iucv_path_severed = 1; + spin_unlock(&logptr->priv_lock); + + wake_up(&conn_wait_queue); + /* just in case we're sleeping waiting for a record */ + wake_up_interruptible(&read_wait_queue); +} + + +static void vmlogrdr_iucv_message_pending(struct iucv_path *path, + struct iucv_message *msg) +{ + struct vmlogrdr_priv_t * logptr = path->private; + + /* + * This function is the bottom half so it should be quick. + * Copy the external interrupt data into our local eib and increment + * the usage count + */ + spin_lock(&logptr->priv_lock); + memcpy(&logptr->local_interrupt_buffer, msg, sizeof(*msg)); + atomic_inc(&logptr->receive_ready); + spin_unlock(&logptr->priv_lock); + wake_up_interruptible(&read_wait_queue); +} + + +static int vmlogrdr_get_recording_class_AB(void) +{ + static const char cp_command[] = "QUERY COMMAND RECORDING "; + char cp_response[80]; + char *tail; + int len,i; + + cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); + len = strnlen(cp_response,sizeof(cp_response)); + // now the parsing + tail=strnchr(cp_response,len,'='); + if (!tail) + return 0; + tail++; + if (!strncmp("ANY",tail,3)) + return 1; + if (!strncmp("NONE",tail,4)) + return 0; + /* + * expect comma separated list of classes here, if one of them + * is A or B return 1 otherwise 0 + */ + for (i=tail-cp_response; irecording_name, + qid_string); + cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); + } + + memset(cp_command, 0x00, sizeof(cp_command)); + memset(cp_response, 0x00, sizeof(cp_response)); + snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s", + logptr->recording_name, + onoff, + qid_string); + cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); + /* The recording command will usually answer with 'Command complete' + * on success, but when the specific service was never connected + * before then there might be an additional informational message + * 'HCPCRC8072I Recording entry not found' before the + * 'Command complete'. So I use strstr rather then the strncmp. + */ + if (strstr(cp_response,"Command complete")) + rc = 0; + else + rc = -EIO; + /* + * If we turn recording off, we have to purge any remaining records + * afterwards, as a large number of queued records may impact z/VM + * performance. + */ + if (purge && (action == 0)) { + memset(cp_command, 0x00, sizeof(cp_command)); + memset(cp_response, 0x00, sizeof(cp_response)); + snprintf(cp_command, sizeof(cp_command), + "RECORDING %s PURGE %s", + logptr->recording_name, + qid_string); + cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); + } + + return rc; +} + + +static int vmlogrdr_open (struct inode *inode, struct file *filp) +{ + int dev_num = 0; + struct vmlogrdr_priv_t * logptr = NULL; + int connect_rc = 0; + int ret; + + dev_num = iminor(inode); + if (dev_num >= MAXMINOR) + return -ENODEV; + logptr = &sys_ser[dev_num]; + + /* + * only allow for blocking reads to be open + */ + if (filp->f_flags & O_NONBLOCK) + return -EOPNOTSUPP; + + /* Besure this device hasn't already been opened */ + spin_lock_bh(&logptr->priv_lock); + if (logptr->dev_in_use) { + spin_unlock_bh(&logptr->priv_lock); + return -EBUSY; + } + logptr->dev_in_use = 1; + logptr->connection_established = 0; + logptr->iucv_path_severed = 0; + atomic_set(&logptr->receive_ready, 0); + logptr->buffer_free = 1; + spin_unlock_bh(&logptr->priv_lock); + + /* set the file options */ + filp->private_data = logptr; + + /* start recording for this service*/ + if (logptr->autorecording) { + ret = vmlogrdr_recording(logptr,1,logptr->autopurge); + if (ret) + pr_warn("vmlogrdr: failed to start recording automatically\n"); + } + + /* create connection to the system service */ + logptr->path = iucv_path_alloc(10, 0, GFP_KERNEL); + if (!logptr->path) + goto out_dev; + connect_rc = iucv_path_connect(logptr->path, &vmlogrdr_iucv_handler, + logptr->system_service, NULL, NULL, + logptr); + if (connect_rc) { + pr_err("vmlogrdr: iucv connection to %s " + "failed with rc %i \n", + logptr->system_service, connect_rc); + goto out_path; + } + + /* We've issued the connect and now we must wait for a + * ConnectionComplete or ConnectinSevered Interrupt + * before we can continue to process. + */ + wait_event(conn_wait_queue, (logptr->connection_established) + || (logptr->iucv_path_severed)); + if (logptr->iucv_path_severed) + goto out_record; + nonseekable_open(inode, filp); + return 0; + +out_record: + if (logptr->autorecording) + vmlogrdr_recording(logptr,0,logptr->autopurge); +out_path: + kfree(logptr->path); /* kfree(NULL) is ok. */ + logptr->path = NULL; +out_dev: + logptr->dev_in_use = 0; + return -EIO; +} + + +static int vmlogrdr_release (struct inode *inode, struct file *filp) +{ + int ret; + + struct vmlogrdr_priv_t * logptr = filp->private_data; + + iucv_path_sever(logptr->path, NULL); + kfree(logptr->path); + logptr->path = NULL; + if (logptr->autorecording) { + ret = vmlogrdr_recording(logptr,0,logptr->autopurge); + if (ret) + pr_warn("vmlogrdr: failed to stop recording automatically\n"); + } + logptr->dev_in_use = 0; + + return 0; +} + + +static int vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv) +{ + int rc, *temp; + /* we need to keep track of two data sizes here: + * The number of bytes we need to receive from iucv and + * the total number of bytes we actually write into the buffer. + */ + int user_data_count, iucv_data_count; + char * buffer; + + if (atomic_read(&priv->receive_ready)) { + spin_lock_bh(&priv->priv_lock); + if (priv->residual_length){ + /* receive second half of a record */ + iucv_data_count = priv->residual_length; + user_data_count = 0; + buffer = priv->buffer; + } else { + /* receive a new record: + * We need to return the total length of the record + * + size of FENCE in the first 4 bytes of the buffer. + */ + iucv_data_count = priv->local_interrupt_buffer.length; + user_data_count = sizeof(int); + temp = (int*)priv->buffer; + *temp= iucv_data_count + sizeof(FENCE); + buffer = priv->buffer + sizeof(int); + } + /* + * If the record is bigger than our buffer, we receive only + * a part of it. We can get the rest later. + */ + if (iucv_data_count > NET_BUFFER_SIZE) + iucv_data_count = NET_BUFFER_SIZE; + rc = iucv_message_receive(priv->path, + &priv->local_interrupt_buffer, + 0, buffer, iucv_data_count, + &priv->residual_length); + spin_unlock_bh(&priv->priv_lock); + /* An rc of 5 indicates that the record was bigger than + * the buffer, which is OK for us. A 9 indicates that the + * record was purged befor we could receive it. + */ + if (rc == 5) + rc = 0; + if (rc == 9) + atomic_set(&priv->receive_ready, 0); + } else { + rc = 1; + } + if (!rc) { + priv->buffer_free = 0; + user_data_count += iucv_data_count; + priv->current_position = priv->buffer; + if (priv->residual_length == 0){ + /* the whole record has been captured, + * now add the fence */ + atomic_dec(&priv->receive_ready); + buffer = priv->buffer + user_data_count; + memcpy(buffer, FENCE, sizeof(FENCE)); + user_data_count += sizeof(FENCE); + } + priv->remaining = user_data_count; + } + + return rc; +} + + +static ssize_t vmlogrdr_read(struct file *filp, char __user *data, + size_t count, loff_t * ppos) +{ + int rc; + struct vmlogrdr_priv_t * priv = filp->private_data; + + while (priv->buffer_free) { + rc = vmlogrdr_receive_data(priv); + if (rc) { + rc = wait_event_interruptible(read_wait_queue, + atomic_read(&priv->receive_ready)); + if (rc) + return rc; + } + } + /* copy only up to end of record */ + if (count > priv->remaining) + count = priv->remaining; + + if (copy_to_user(data, priv->current_position, count)) + return -EFAULT; + + *ppos += count; + priv->current_position += count; + priv->remaining -= count; + + /* if all data has been transferred, set buffer free */ + if (priv->remaining == 0) + priv->buffer_free = 1; + + return count; +} + +static ssize_t vmlogrdr_autopurge_store(struct device * dev, + struct device_attribute *attr, + const char * buf, size_t count) +{ + struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); + ssize_t ret = count; + + switch (buf[0]) { + case '0': + priv->autopurge=0; + break; + case '1': + priv->autopurge=1; + break; + default: + ret = -EINVAL; + } + return ret; +} + + +static ssize_t vmlogrdr_autopurge_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); + return sprintf(buf, "%u\n", priv->autopurge); +} + + +static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show, + vmlogrdr_autopurge_store); + + +static ssize_t vmlogrdr_purge_store(struct device * dev, + struct device_attribute *attr, + const char * buf, size_t count) +{ + + char cp_command[80]; + char cp_response[80]; + struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); + + if (buf[0] != '1') + return -EINVAL; + + memset(cp_command, 0x00, sizeof(cp_command)); + memset(cp_response, 0x00, sizeof(cp_response)); + + /* + * The recording command needs to be called with option QID + * for guests that have previlege classes A or B. + * Other guests will not recognize the command and we have to + * issue the same command without the QID parameter. + */ + + if (recording_class_AB) + snprintf(cp_command, sizeof(cp_command), + "RECORDING %s PURGE QID * ", + priv->recording_name); + else + snprintf(cp_command, sizeof(cp_command), + "RECORDING %s PURGE ", + priv->recording_name); + + cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); + + return count; +} + + +static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store); + + +static ssize_t vmlogrdr_autorecording_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); + ssize_t ret = count; + + switch (buf[0]) { + case '0': + priv->autorecording=0; + break; + case '1': + priv->autorecording=1; + break; + default: + ret = -EINVAL; + } + return ret; +} + + +static ssize_t vmlogrdr_autorecording_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); + return sprintf(buf, "%u\n", priv->autorecording); +} + + +static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show, + vmlogrdr_autorecording_store); + + +static ssize_t vmlogrdr_recording_store(struct device * dev, + struct device_attribute *attr, + const char * buf, size_t count) +{ + struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); + ssize_t ret; + + switch (buf[0]) { + case '0': + ret = vmlogrdr_recording(priv,0,0); + break; + case '1': + ret = vmlogrdr_recording(priv,1,0); + break; + default: + ret = -EINVAL; + } + if (ret) + return ret; + else + return count; + +} + + +static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store); + + +static ssize_t recording_status_show(struct device_driver *driver, char *buf) +{ + static const char cp_command[] = "QUERY RECORDING "; + int len; + + cpcmd(cp_command, buf, 4096, NULL); + len = strlen(buf); + return len; +} +static DRIVER_ATTR_RO(recording_status); +static struct attribute *vmlogrdr_drv_attrs[] = { + &driver_attr_recording_status.attr, + NULL, +}; +static struct attribute_group vmlogrdr_drv_attr_group = { + .attrs = vmlogrdr_drv_attrs, +}; +static const struct attribute_group *vmlogrdr_drv_attr_groups[] = { + &vmlogrdr_drv_attr_group, + NULL, +}; + +static struct attribute *vmlogrdr_attrs[] = { + &dev_attr_autopurge.attr, + &dev_attr_purge.attr, + &dev_attr_autorecording.attr, + &dev_attr_recording.attr, + NULL, +}; +static struct attribute_group vmlogrdr_attr_group = { + .attrs = vmlogrdr_attrs, +}; +static const struct attribute_group *vmlogrdr_attr_groups[] = { + &vmlogrdr_attr_group, + NULL, +}; + +static int vmlogrdr_pm_prepare(struct device *dev) +{ + int rc; + struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev); + + rc = 0; + if (priv) { + spin_lock_bh(&priv->priv_lock); + if (priv->dev_in_use) + rc = -EBUSY; + spin_unlock_bh(&priv->priv_lock); + } + if (rc) + pr_err("vmlogrdr: device %s is busy. Refuse to suspend.\n", + dev_name(dev)); + return rc; +} + + +static const struct dev_pm_ops vmlogrdr_pm_ops = { + .prepare = vmlogrdr_pm_prepare, +}; + +static struct class *vmlogrdr_class; +static struct device_driver vmlogrdr_driver = { + .name = "vmlogrdr", + .bus = &iucv_bus, + .pm = &vmlogrdr_pm_ops, + .groups = vmlogrdr_drv_attr_groups, +}; + +static int vmlogrdr_register_driver(void) +{ + int ret; + + /* Register with iucv driver */ + ret = iucv_register(&vmlogrdr_iucv_handler, 1); + if (ret) + goto out; + + ret = driver_register(&vmlogrdr_driver); + if (ret) + goto out_iucv; + + vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr"); + if (IS_ERR(vmlogrdr_class)) { + ret = PTR_ERR(vmlogrdr_class); + vmlogrdr_class = NULL; + goto out_driver; + } + return 0; + +out_driver: + driver_unregister(&vmlogrdr_driver); +out_iucv: + iucv_unregister(&vmlogrdr_iucv_handler, 1); +out: + return ret; +} + + +static void vmlogrdr_unregister_driver(void) +{ + class_destroy(vmlogrdr_class); + vmlogrdr_class = NULL; + driver_unregister(&vmlogrdr_driver); + iucv_unregister(&vmlogrdr_iucv_handler, 1); +} + + +static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv) +{ + struct device *dev; + int ret; + + dev = kzalloc(sizeof(struct device), GFP_KERNEL); + if (dev) { + dev_set_name(dev, "%s", priv->internal_name); + dev->bus = &iucv_bus; + dev->parent = iucv_root; + dev->driver = &vmlogrdr_driver; + dev->groups = vmlogrdr_attr_groups; + dev_set_drvdata(dev, priv); + /* + * The release function could be called after the + * module has been unloaded. It's _only_ task is to + * free the struct. Therefore, we specify kfree() + * directly here. (Probably a little bit obfuscating + * but legitime ...). + */ + dev->release = (void (*)(struct device *))kfree; + } else + return -ENOMEM; + ret = device_register(dev); + if (ret) { + put_device(dev); + return ret; + } + + priv->class_device = device_create(vmlogrdr_class, dev, + MKDEV(vmlogrdr_major, + priv->minor_num), + priv, "%s", dev_name(dev)); + if (IS_ERR(priv->class_device)) { + ret = PTR_ERR(priv->class_device); + priv->class_device=NULL; + device_unregister(dev); + return ret; + } + priv->device = dev; + return 0; +} + + +static int vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv) +{ + device_destroy(vmlogrdr_class, MKDEV(vmlogrdr_major, priv->minor_num)); + if (priv->device != NULL) { + device_unregister(priv->device); + priv->device=NULL; + } + return 0; +} + + +static int vmlogrdr_register_cdev(dev_t dev) +{ + int rc = 0; + vmlogrdr_cdev = cdev_alloc(); + if (!vmlogrdr_cdev) { + return -ENOMEM; + } + vmlogrdr_cdev->owner = THIS_MODULE; + vmlogrdr_cdev->ops = &vmlogrdr_fops; + rc = cdev_add(vmlogrdr_cdev, dev, MAXMINOR); + if (!rc) + return 0; + + // cleanup: cdev is not fully registered, no cdev_del here! + kobject_put(&vmlogrdr_cdev->kobj); + vmlogrdr_cdev=NULL; + return rc; +} + + +static void vmlogrdr_cleanup(void) +{ + int i; + + if (vmlogrdr_cdev) { + cdev_del(vmlogrdr_cdev); + vmlogrdr_cdev=NULL; + } + for (i=0; i < MAXMINOR; ++i ) { + vmlogrdr_unregister_device(&sys_ser[i]); + free_page((unsigned long)sys_ser[i].buffer); + } + vmlogrdr_unregister_driver(); + if (vmlogrdr_major) { + unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR); + vmlogrdr_major=0; + } +} + + +static int __init vmlogrdr_init(void) +{ + int rc; + int i; + dev_t dev; + + if (! MACHINE_IS_VM) { + pr_err("not running under VM, driver not loaded.\n"); + return -ENODEV; + } + + recording_class_AB = vmlogrdr_get_recording_class_AB(); + + rc = alloc_chrdev_region(&dev, 0, MAXMINOR, "vmlogrdr"); + if (rc) + return rc; + vmlogrdr_major = MAJOR(dev); + + rc=vmlogrdr_register_driver(); + if (rc) + goto cleanup; + + for (i=0; i < MAXMINOR; ++i ) { + sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sys_ser[i].buffer) { + rc = -ENOMEM; + break; + } + sys_ser[i].current_position = sys_ser[i].buffer; + rc=vmlogrdr_register_device(&sys_ser[i]); + if (rc) + break; + } + if (rc) + goto cleanup; + + rc = vmlogrdr_register_cdev(dev); + if (rc) + goto cleanup; + return 0; + +cleanup: + vmlogrdr_cleanup(); + return rc; +} + + +static void __exit vmlogrdr_exit(void) +{ + vmlogrdr_cleanup(); + return; +} + + +module_init(vmlogrdr_init); +module_exit(vmlogrdr_exit); diff --git a/drivers/s390/char/vmur.c b/drivers/s390/char/vmur.c new file mode 100644 index 000000000..cbde65ab2 --- /dev/null +++ b/drivers/s390/char/vmur.c @@ -0,0 +1,1058 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Linux driver for System z and s390 unit record devices + * (z/VM virtual punch, reader, printer) + * + * Copyright IBM Corp. 2001, 2009 + * Authors: Malcolm Beattie + * Michael Holzheu + * Frank Munzert + */ + +#define KMSG_COMPONENT "vmur" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "vmur.h" + +/* + * Driver overview + * + * Unit record device support is implemented as a character device driver. + * We can fit at least 16 bits into a device minor number and use the + * simple method of mapping a character device number with minor abcd + * to the unit record device with devno abcd. + * I/O to virtual unit record devices is handled as follows: + * Reads: Diagnose code 0x14 (input spool file manipulation) + * is used to read spool data page-wise. + * Writes: The CCW used is WRITE_CCW_CMD (0x01). The device's record length + * is available by reading sysfs attr reclen. Each write() to the device + * must specify an integral multiple (maximal 511) of reclen. + */ + +static char ur_banner[] = "z/VM virtual unit record device driver"; + +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver"); +MODULE_LICENSE("GPL"); + +static dev_t ur_first_dev_maj_min; +static struct class *vmur_class; +static struct debug_info *vmur_dbf; + +/* We put the device's record length (for writes) in the driver_info field */ +static struct ccw_device_id ur_ids[] = { + { CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) }, + { CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) }, + { /* end of list */ } +}; + +MODULE_DEVICE_TABLE(ccw, ur_ids); + +static int ur_probe(struct ccw_device *cdev); +static void ur_remove(struct ccw_device *cdev); +static int ur_set_online(struct ccw_device *cdev); +static int ur_set_offline(struct ccw_device *cdev); +static int ur_pm_suspend(struct ccw_device *cdev); + +static struct ccw_driver ur_driver = { + .driver = { + .name = "vmur", + .owner = THIS_MODULE, + }, + .ids = ur_ids, + .probe = ur_probe, + .remove = ur_remove, + .set_online = ur_set_online, + .set_offline = ur_set_offline, + .freeze = ur_pm_suspend, + .int_class = IRQIO_VMR, +}; + +static DEFINE_MUTEX(vmur_mutex); + +/* + * Allocation, freeing, getting and putting of urdev structures + * + * Each ur device (urd) contains a reference to its corresponding ccw device + * (cdev) using the urd->cdev pointer. Each ccw device has a reference to the + * ur device using dev_get_drvdata(&cdev->dev) pointer. + * + * urd references: + * - ur_probe gets a urd reference, ur_remove drops the reference + * dev_get_drvdata(&cdev->dev) + * - ur_open gets a urd reference, ur_release drops the reference + * (urf->urd) + * + * cdev references: + * - urdev_alloc get a cdev reference (urd->cdev) + * - urdev_free drops the cdev reference (urd->cdev) + * + * Setting and clearing of dev_get_drvdata(&cdev->dev) is protected by the ccwdev lock + */ +static struct urdev *urdev_alloc(struct ccw_device *cdev) +{ + struct urdev *urd; + + urd = kzalloc(sizeof(struct urdev), GFP_KERNEL); + if (!urd) + return NULL; + urd->reclen = cdev->id.driver_info; + ccw_device_get_id(cdev, &urd->dev_id); + mutex_init(&urd->io_mutex); + init_waitqueue_head(&urd->wait); + spin_lock_init(&urd->open_lock); + refcount_set(&urd->ref_count, 1); + urd->cdev = cdev; + get_device(&cdev->dev); + return urd; +} + +static void urdev_free(struct urdev *urd) +{ + TRACE("urdev_free: %p\n", urd); + if (urd->cdev) + put_device(&urd->cdev->dev); + kfree(urd); +} + +static void urdev_get(struct urdev *urd) +{ + refcount_inc(&urd->ref_count); +} + +static struct urdev *urdev_get_from_cdev(struct ccw_device *cdev) +{ + struct urdev *urd; + unsigned long flags; + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + urd = dev_get_drvdata(&cdev->dev); + if (urd) + urdev_get(urd); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + return urd; +} + +static struct urdev *urdev_get_from_devno(u16 devno) +{ + char bus_id[16]; + struct ccw_device *cdev; + struct urdev *urd; + + sprintf(bus_id, "0.0.%04x", devno); + cdev = get_ccwdev_by_busid(&ur_driver, bus_id); + if (!cdev) + return NULL; + urd = urdev_get_from_cdev(cdev); + put_device(&cdev->dev); + return urd; +} + +static void urdev_put(struct urdev *urd) +{ + if (refcount_dec_and_test(&urd->ref_count)) + urdev_free(urd); +} + +/* + * State and contents of ur devices can be changed by class D users issuing + * CP commands such as PURGE or TRANSFER, while the Linux guest is suspended. + * Also the Linux guest might be logged off, which causes all active spool + * files to be closed. + * So we cannot guarantee that spool files are still the same when the Linux + * guest is resumed. In order to avoid unpredictable results at resume time + * we simply refuse to suspend if a ur device node is open. + */ +static int ur_pm_suspend(struct ccw_device *cdev) +{ + struct urdev *urd = dev_get_drvdata(&cdev->dev); + + TRACE("ur_pm_suspend: cdev=%p\n", cdev); + if (urd->open_flag) { + pr_err("Unit record device %s is busy, %s refusing to " + "suspend.\n", dev_name(&cdev->dev), ur_banner); + return -EBUSY; + } + return 0; +} + +/* + * Low-level functions to do I/O to a ur device. + * alloc_chan_prog + * free_chan_prog + * do_ur_io + * ur_int_handler + * + * alloc_chan_prog allocates and builds the channel program + * free_chan_prog frees memory of the channel program + * + * do_ur_io issues the channel program to the device and blocks waiting + * on a completion event it publishes at urd->io_done. The function + * serialises itself on the device's mutex so that only one I/O + * is issued at a time (and that I/O is synchronous). + * + * ur_int_handler catches the "I/O done" interrupt, writes the + * subchannel status word into the scsw member of the urdev structure + * and complete()s the io_done to wake the waiting do_ur_io. + * + * The caller of do_ur_io is responsible for kfree()ing the channel program + * address pointer that alloc_chan_prog returned. + */ + +static void free_chan_prog(struct ccw1 *cpa) +{ + struct ccw1 *ptr = cpa; + + while (ptr->cda) { + kfree((void *)(addr_t) ptr->cda); + ptr++; + } + kfree(cpa); +} + +/* + * alloc_chan_prog + * The channel program we use is write commands chained together + * with a final NOP CCW command-chained on (which ensures that CE and DE + * are presented together in a single interrupt instead of as separate + * interrupts unless an incorrect length indication kicks in first). The + * data length in each CCW is reclen. + */ +static struct ccw1 *alloc_chan_prog(const char __user *ubuf, int rec_count, + int reclen) +{ + struct ccw1 *cpa; + void *kbuf; + int i; + + TRACE("alloc_chan_prog(%p, %i, %i)\n", ubuf, rec_count, reclen); + + /* + * We chain a NOP onto the writes to force CE+DE together. + * That means we allocate room for CCWs to cover count/reclen + * records plus a NOP. + */ + cpa = kcalloc(rec_count + 1, sizeof(struct ccw1), + GFP_KERNEL | GFP_DMA); + if (!cpa) + return ERR_PTR(-ENOMEM); + + for (i = 0; i < rec_count; i++) { + cpa[i].cmd_code = WRITE_CCW_CMD; + cpa[i].flags = CCW_FLAG_CC | CCW_FLAG_SLI; + cpa[i].count = reclen; + kbuf = kmalloc(reclen, GFP_KERNEL | GFP_DMA); + if (!kbuf) { + free_chan_prog(cpa); + return ERR_PTR(-ENOMEM); + } + cpa[i].cda = (u32)(addr_t) kbuf; + if (copy_from_user(kbuf, ubuf, reclen)) { + free_chan_prog(cpa); + return ERR_PTR(-EFAULT); + } + ubuf += reclen; + } + /* The following NOP CCW forces CE+DE to be presented together */ + cpa[i].cmd_code = CCW_CMD_NOOP; + return cpa; +} + +static int do_ur_io(struct urdev *urd, struct ccw1 *cpa) +{ + int rc; + struct ccw_device *cdev = urd->cdev; + DECLARE_COMPLETION_ONSTACK(event); + + TRACE("do_ur_io: cpa=%p\n", cpa); + + rc = mutex_lock_interruptible(&urd->io_mutex); + if (rc) + return rc; + + urd->io_done = &event; + + spin_lock_irq(get_ccwdev_lock(cdev)); + rc = ccw_device_start(cdev, cpa, 1, 0, 0); + spin_unlock_irq(get_ccwdev_lock(cdev)); + + TRACE("do_ur_io: ccw_device_start returned %d\n", rc); + if (rc) + goto out; + + wait_for_completion(&event); + TRACE("do_ur_io: I/O complete\n"); + rc = 0; + +out: + mutex_unlock(&urd->io_mutex); + return rc; +} + +/* + * ur interrupt handler, called from the ccw_device layer + */ +static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm, + struct irb *irb) +{ + struct urdev *urd; + + if (!IS_ERR(irb)) { + TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n", + intparm, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat, + irb->scsw.cmd.count); + } + if (!intparm) { + TRACE("ur_int_handler: unsolicited interrupt\n"); + return; + } + urd = dev_get_drvdata(&cdev->dev); + BUG_ON(!urd); + /* On special conditions irb is an error pointer */ + if (IS_ERR(irb)) + urd->io_request_rc = PTR_ERR(irb); + else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END)) + urd->io_request_rc = 0; + else + urd->io_request_rc = -EIO; + + complete(urd->io_done); +} + +/* + * reclen sysfs attribute - The record length to be used for write CCWs + */ +static ssize_t ur_attr_reclen_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct urdev *urd; + int rc; + + urd = urdev_get_from_cdev(to_ccwdev(dev)); + if (!urd) + return -ENODEV; + rc = sprintf(buf, "%zu\n", urd->reclen); + urdev_put(urd); + return rc; +} + +static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL); + +static int ur_create_attributes(struct device *dev) +{ + return device_create_file(dev, &dev_attr_reclen); +} + +static void ur_remove_attributes(struct device *dev) +{ + device_remove_file(dev, &dev_attr_reclen); +} + +/* + * diagnose code 0x210 - retrieve device information + * cc=0 normal completion, we have a real device + * cc=1 CP paging error + * cc=2 The virtual device exists, but is not associated with a real device + * cc=3 Invalid device address, or the virtual device does not exist + */ +static int get_urd_class(struct urdev *urd) +{ + static struct diag210 ur_diag210; + int cc; + + ur_diag210.vrdcdvno = urd->dev_id.devno; + ur_diag210.vrdclen = sizeof(struct diag210); + + cc = diag210(&ur_diag210); + switch (cc) { + case 0: + return -EOPNOTSUPP; + case 2: + return ur_diag210.vrdcvcla; /* virtual device class */ + case 3: + return -ENODEV; + default: + return -EIO; + } +} + +/* + * Allocation and freeing of urfile structures + */ +static struct urfile *urfile_alloc(struct urdev *urd) +{ + struct urfile *urf; + + urf = kzalloc(sizeof(struct urfile), GFP_KERNEL); + if (!urf) + return NULL; + urf->urd = urd; + + TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf, + urf->dev_reclen); + + return urf; +} + +static void urfile_free(struct urfile *urf) +{ + TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd); + kfree(urf); +} + +/* + * The fops implementation of the character device driver + */ +static ssize_t do_write(struct urdev *urd, const char __user *udata, + size_t count, size_t reclen, loff_t *ppos) +{ + struct ccw1 *cpa; + int rc; + + cpa = alloc_chan_prog(udata, count / reclen, reclen); + if (IS_ERR(cpa)) + return PTR_ERR(cpa); + + rc = do_ur_io(urd, cpa); + if (rc) + goto fail_kfree_cpa; + + if (urd->io_request_rc) { + rc = urd->io_request_rc; + goto fail_kfree_cpa; + } + *ppos += count; + rc = count; + +fail_kfree_cpa: + free_chan_prog(cpa); + return rc; +} + +static ssize_t ur_write(struct file *file, const char __user *udata, + size_t count, loff_t *ppos) +{ + struct urfile *urf = file->private_data; + + TRACE("ur_write: count=%zu\n", count); + + if (count == 0) + return 0; + + if (count % urf->dev_reclen) + return -EINVAL; /* count must be a multiple of reclen */ + + if (count > urf->dev_reclen * MAX_RECS_PER_IO) + count = urf->dev_reclen * MAX_RECS_PER_IO; + + return do_write(urf->urd, udata, count, urf->dev_reclen, ppos); +} + +/* + * diagnose code 0x14 subcode 0x0028 - position spool file to designated + * record + * cc=0 normal completion + * cc=2 no file active on the virtual reader or device not ready + * cc=3 record specified is beyond EOF + */ +static int diag_position_to_record(int devno, int record) +{ + int cc; + + cc = diag14(record, devno, 0x28); + switch (cc) { + case 0: + return 0; + case 2: + return -ENOMEDIUM; + case 3: + return -ENODATA; /* position beyond end of file */ + default: + return -EIO; + } +} + +/* + * diagnose code 0x14 subcode 0x0000 - read next spool file buffer + * cc=0 normal completion + * cc=1 EOF reached + * cc=2 no file active on the virtual reader, and no file eligible + * cc=3 file already active on the virtual reader or specified virtual + * reader does not exist or is not a reader + */ +static int diag_read_file(int devno, char *buf) +{ + int cc; + + cc = diag14((unsigned long) buf, devno, 0x00); + switch (cc) { + case 0: + return 0; + case 1: + return -ENODATA; + case 2: + return -ENOMEDIUM; + default: + return -EIO; + } +} + +static ssize_t diag14_read(struct file *file, char __user *ubuf, size_t count, + loff_t *offs) +{ + size_t len, copied, res; + char *buf; + int rc; + u16 reclen; + struct urdev *urd; + + urd = ((struct urfile *) file->private_data)->urd; + reclen = ((struct urfile *) file->private_data)->file_reclen; + + rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1); + if (rc == -ENODATA) + return 0; + if (rc) + return rc; + + len = min((size_t) PAGE_SIZE, count); + buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA); + if (!buf) + return -ENOMEM; + + copied = 0; + res = (size_t) (*offs % PAGE_SIZE); + do { + rc = diag_read_file(urd->dev_id.devno, buf); + if (rc == -ENODATA) { + break; + } + if (rc) + goto fail; + if (reclen && (copied == 0) && (*offs < PAGE_SIZE)) + *((u16 *) &buf[FILE_RECLEN_OFFSET]) = reclen; + len = min(count - copied, PAGE_SIZE - res); + if (copy_to_user(ubuf + copied, buf + res, len)) { + rc = -EFAULT; + goto fail; + } + res = 0; + copied += len; + } while (copied != count); + + *offs += copied; + rc = copied; +fail: + free_page((unsigned long) buf); + return rc; +} + +static ssize_t ur_read(struct file *file, char __user *ubuf, size_t count, + loff_t *offs) +{ + struct urdev *urd; + int rc; + + TRACE("ur_read: count=%zu ppos=%li\n", count, (unsigned long) *offs); + + if (count == 0) + return 0; + + urd = ((struct urfile *) file->private_data)->urd; + rc = mutex_lock_interruptible(&urd->io_mutex); + if (rc) + return rc; + rc = diag14_read(file, ubuf, count, offs); + mutex_unlock(&urd->io_mutex); + return rc; +} + +/* + * diagnose code 0x14 subcode 0x0fff - retrieve next file descriptor + * cc=0 normal completion + * cc=1 no files on reader queue or no subsequent file + * cc=2 spid specified is invalid + */ +static int diag_read_next_file_info(struct file_control_block *buf, int spid) +{ + int cc; + + cc = diag14((unsigned long) buf, spid, 0xfff); + switch (cc) { + case 0: + return 0; + default: + return -ENODATA; + } +} + +static int verify_uri_device(struct urdev *urd) +{ + struct file_control_block *fcb; + char *buf; + int rc; + + fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA); + if (!fcb) + return -ENOMEM; + + /* check for empty reader device (beginning of chain) */ + rc = diag_read_next_file_info(fcb, 0); + if (rc) + goto fail_free_fcb; + + /* if file is in hold status, we do not read it */ + if (fcb->file_stat & (FLG_SYSTEM_HOLD | FLG_USER_HOLD)) { + rc = -EPERM; + goto fail_free_fcb; + } + + /* open file on virtual reader */ + buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA); + if (!buf) { + rc = -ENOMEM; + goto fail_free_fcb; + } + rc = diag_read_file(urd->dev_id.devno, buf); + if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */ + goto fail_free_buf; + + /* check if the file on top of the queue is open now */ + rc = diag_read_next_file_info(fcb, 0); + if (rc) + goto fail_free_buf; + if (!(fcb->file_stat & FLG_IN_USE)) { + rc = -EMFILE; + goto fail_free_buf; + } + rc = 0; + +fail_free_buf: + free_page((unsigned long) buf); +fail_free_fcb: + kfree(fcb); + return rc; +} + +static int verify_device(struct urdev *urd) +{ + switch (urd->class) { + case DEV_CLASS_UR_O: + return 0; /* no check needed here */ + case DEV_CLASS_UR_I: + return verify_uri_device(urd); + default: + return -EOPNOTSUPP; + } +} + +static int get_uri_file_reclen(struct urdev *urd) +{ + struct file_control_block *fcb; + int rc; + + fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA); + if (!fcb) + return -ENOMEM; + rc = diag_read_next_file_info(fcb, 0); + if (rc) + goto fail_free; + if (fcb->file_stat & FLG_CP_DUMP) + rc = 0; + else + rc = fcb->rec_len; + +fail_free: + kfree(fcb); + return rc; +} + +static int get_file_reclen(struct urdev *urd) +{ + switch (urd->class) { + case DEV_CLASS_UR_O: + return 0; + case DEV_CLASS_UR_I: + return get_uri_file_reclen(urd); + default: + return -EOPNOTSUPP; + } +} + +static int ur_open(struct inode *inode, struct file *file) +{ + u16 devno; + struct urdev *urd; + struct urfile *urf; + unsigned short accmode; + int rc; + + accmode = file->f_flags & O_ACCMODE; + + if (accmode == O_RDWR) + return -EACCES; + /* + * We treat the minor number as the devno of the ur device + * to find in the driver tree. + */ + devno = MINOR(file_inode(file)->i_rdev); + + urd = urdev_get_from_devno(devno); + if (!urd) { + rc = -ENXIO; + goto out; + } + + spin_lock(&urd->open_lock); + while (urd->open_flag) { + spin_unlock(&urd->open_lock); + if (file->f_flags & O_NONBLOCK) { + rc = -EBUSY; + goto fail_put; + } + if (wait_event_interruptible(urd->wait, urd->open_flag == 0)) { + rc = -ERESTARTSYS; + goto fail_put; + } + spin_lock(&urd->open_lock); + } + urd->open_flag++; + spin_unlock(&urd->open_lock); + + TRACE("ur_open\n"); + + if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) || + ((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) { + TRACE("ur_open: unsupported dev class (%d)\n", urd->class); + rc = -EACCES; + goto fail_unlock; + } + + rc = verify_device(urd); + if (rc) + goto fail_unlock; + + urf = urfile_alloc(urd); + if (!urf) { + rc = -ENOMEM; + goto fail_unlock; + } + + urf->dev_reclen = urd->reclen; + rc = get_file_reclen(urd); + if (rc < 0) + goto fail_urfile_free; + urf->file_reclen = rc; + file->private_data = urf; + return 0; + +fail_urfile_free: + urfile_free(urf); +fail_unlock: + spin_lock(&urd->open_lock); + urd->open_flag--; + spin_unlock(&urd->open_lock); +fail_put: + urdev_put(urd); +out: + return rc; +} + +static int ur_release(struct inode *inode, struct file *file) +{ + struct urfile *urf = file->private_data; + + TRACE("ur_release\n"); + spin_lock(&urf->urd->open_lock); + urf->urd->open_flag--; + spin_unlock(&urf->urd->open_lock); + wake_up_interruptible(&urf->urd->wait); + urdev_put(urf->urd); + urfile_free(urf); + return 0; +} + +static loff_t ur_llseek(struct file *file, loff_t offset, int whence) +{ + if ((file->f_flags & O_ACCMODE) != O_RDONLY) + return -ESPIPE; /* seek allowed only for reader */ + if (offset % PAGE_SIZE) + return -ESPIPE; /* only multiples of 4K allowed */ + return no_seek_end_llseek(file, offset, whence); +} + +static const struct file_operations ur_fops = { + .owner = THIS_MODULE, + .open = ur_open, + .release = ur_release, + .read = ur_read, + .write = ur_write, + .llseek = ur_llseek, +}; + +/* + * ccw_device infrastructure: + * ur_probe creates the struct urdev (with refcount = 1), the device + * attributes, sets up the interrupt handler and validates the virtual + * unit record device. + * ur_remove removes the device attributes and drops the reference to + * struct urdev. + * + * ur_probe, ur_remove, ur_set_online and ur_set_offline are serialized + * by the vmur_mutex lock. + * + * urd->char_device is used as indication that the online function has + * been completed successfully. + */ +static int ur_probe(struct ccw_device *cdev) +{ + struct urdev *urd; + int rc; + + TRACE("ur_probe: cdev=%p\n", cdev); + + mutex_lock(&vmur_mutex); + urd = urdev_alloc(cdev); + if (!urd) { + rc = -ENOMEM; + goto fail_unlock; + } + + rc = ur_create_attributes(&cdev->dev); + if (rc) { + rc = -ENOMEM; + goto fail_urdev_put; + } + cdev->handler = ur_int_handler; + + /* validate virtual unit record device */ + urd->class = get_urd_class(urd); + if (urd->class < 0) { + rc = urd->class; + goto fail_remove_attr; + } + if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) { + rc = -EOPNOTSUPP; + goto fail_remove_attr; + } + spin_lock_irq(get_ccwdev_lock(cdev)); + dev_set_drvdata(&cdev->dev, urd); + spin_unlock_irq(get_ccwdev_lock(cdev)); + + mutex_unlock(&vmur_mutex); + return 0; + +fail_remove_attr: + ur_remove_attributes(&cdev->dev); +fail_urdev_put: + urdev_put(urd); +fail_unlock: + mutex_unlock(&vmur_mutex); + return rc; +} + +static int ur_set_online(struct ccw_device *cdev) +{ + struct urdev *urd; + int minor, major, rc; + char node_id[16]; + + TRACE("ur_set_online: cdev=%p\n", cdev); + + mutex_lock(&vmur_mutex); + urd = urdev_get_from_cdev(cdev); + if (!urd) { + /* ur_remove already deleted our urd */ + rc = -ENODEV; + goto fail_unlock; + } + + if (urd->char_device) { + /* Another ur_set_online was faster */ + rc = -EBUSY; + goto fail_urdev_put; + } + + minor = urd->dev_id.devno; + major = MAJOR(ur_first_dev_maj_min); + + urd->char_device = cdev_alloc(); + if (!urd->char_device) { + rc = -ENOMEM; + goto fail_urdev_put; + } + + urd->char_device->ops = &ur_fops; + urd->char_device->owner = ur_fops.owner; + + rc = cdev_add(urd->char_device, MKDEV(major, minor), 1); + if (rc) + goto fail_free_cdev; + if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) { + if (urd->class == DEV_CLASS_UR_I) + sprintf(node_id, "vmrdr-%s", dev_name(&cdev->dev)); + if (urd->class == DEV_CLASS_UR_O) + sprintf(node_id, "vmpun-%s", dev_name(&cdev->dev)); + } else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) { + sprintf(node_id, "vmprt-%s", dev_name(&cdev->dev)); + } else { + rc = -EOPNOTSUPP; + goto fail_free_cdev; + } + + urd->device = device_create(vmur_class, &cdev->dev, + urd->char_device->dev, NULL, "%s", node_id); + if (IS_ERR(urd->device)) { + rc = PTR_ERR(urd->device); + TRACE("ur_set_online: device_create rc=%d\n", rc); + goto fail_free_cdev; + } + urdev_put(urd); + mutex_unlock(&vmur_mutex); + return 0; + +fail_free_cdev: + cdev_del(urd->char_device); + urd->char_device = NULL; +fail_urdev_put: + urdev_put(urd); +fail_unlock: + mutex_unlock(&vmur_mutex); + return rc; +} + +static int ur_set_offline_force(struct ccw_device *cdev, int force) +{ + struct urdev *urd; + int rc; + + TRACE("ur_set_offline: cdev=%p\n", cdev); + urd = urdev_get_from_cdev(cdev); + if (!urd) + /* ur_remove already deleted our urd */ + return -ENODEV; + if (!urd->char_device) { + /* Another ur_set_offline was faster */ + rc = -EBUSY; + goto fail_urdev_put; + } + if (!force && (refcount_read(&urd->ref_count) > 2)) { + /* There is still a user of urd (e.g. ur_open) */ + TRACE("ur_set_offline: BUSY\n"); + rc = -EBUSY; + goto fail_urdev_put; + } + device_destroy(vmur_class, urd->char_device->dev); + cdev_del(urd->char_device); + urd->char_device = NULL; + rc = 0; + +fail_urdev_put: + urdev_put(urd); + return rc; +} + +static int ur_set_offline(struct ccw_device *cdev) +{ + int rc; + + mutex_lock(&vmur_mutex); + rc = ur_set_offline_force(cdev, 0); + mutex_unlock(&vmur_mutex); + return rc; +} + +static void ur_remove(struct ccw_device *cdev) +{ + unsigned long flags; + + TRACE("ur_remove\n"); + + mutex_lock(&vmur_mutex); + + if (cdev->online) + ur_set_offline_force(cdev, 1); + ur_remove_attributes(&cdev->dev); + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + urdev_put(dev_get_drvdata(&cdev->dev)); + dev_set_drvdata(&cdev->dev, NULL); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + + mutex_unlock(&vmur_mutex); +} + +/* + * Module initialisation and cleanup + */ +static int __init ur_init(void) +{ + int rc; + dev_t dev; + + if (!MACHINE_IS_VM) { + pr_err("The %s cannot be loaded without z/VM\n", + ur_banner); + return -ENODEV; + } + + vmur_dbf = debug_register("vmur", 4, 1, 4 * sizeof(long)); + if (!vmur_dbf) + return -ENOMEM; + rc = debug_register_view(vmur_dbf, &debug_sprintf_view); + if (rc) + goto fail_free_dbf; + + debug_set_level(vmur_dbf, 6); + + vmur_class = class_create(THIS_MODULE, "vmur"); + if (IS_ERR(vmur_class)) { + rc = PTR_ERR(vmur_class); + goto fail_free_dbf; + } + + rc = ccw_driver_register(&ur_driver); + if (rc) + goto fail_class_destroy; + + rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur"); + if (rc) { + pr_err("Kernel function alloc_chrdev_region failed with " + "error code %d\n", rc); + goto fail_unregister_driver; + } + ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0); + + pr_info("%s loaded.\n", ur_banner); + return 0; + +fail_unregister_driver: + ccw_driver_unregister(&ur_driver); +fail_class_destroy: + class_destroy(vmur_class); +fail_free_dbf: + debug_unregister(vmur_dbf); + return rc; +} + +static void __exit ur_exit(void) +{ + unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS); + ccw_driver_unregister(&ur_driver); + class_destroy(vmur_class); + debug_unregister(vmur_dbf); + pr_info("%s unloaded.\n", ur_banner); +} + +module_init(ur_init); +module_exit(ur_exit); diff --git a/drivers/s390/char/vmur.h b/drivers/s390/char/vmur.h new file mode 100644 index 000000000..608b0719c --- /dev/null +++ b/drivers/s390/char/vmur.h @@ -0,0 +1,113 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Linux driver for System z and s390 unit record devices + * (z/VM virtual punch, reader, printer) + * + * Copyright IBM Corp. 2001, 2007 + * Authors: Malcolm Beattie + * Michael Holzheu + * Frank Munzert + */ + +#ifndef _VMUR_H_ +#define _VMUR_H_ + +#include + +#define DEV_CLASS_UR_I 0x20 /* diag210 unit record input device class */ +#define DEV_CLASS_UR_O 0x10 /* diag210 unit record output device class */ +/* + * we only support z/VM's default unit record devices: + * both in SPOOL directory control statement and in CP DEFINE statement + * RDR defaults to 2540 reader + * PUN defaults to 2540 punch + * PRT defaults to 1403 printer + */ +#define READER_PUNCH_DEVTYPE 0x2540 +#define PRINTER_DEVTYPE 0x1403 + +/* z/VM spool file control block SFBLOK */ +struct file_control_block { + char reserved_1[8]; + char user_owner[8]; + char user_orig[8]; + __s32 data_recs; + __s16 rec_len; + __s16 file_num; + __u8 file_stat; + __u8 dev_type; + char reserved_2[6]; + char file_name[12]; + char file_type[12]; + char create_date[8]; + char create_time[8]; + char reserved_3[6]; + __u8 file_class; + __u8 sfb_lok; + __u64 distr_code; + __u32 reserved_4; + __u8 current_starting_copy_number; + __u8 sfblock_cntrl_flags; + __u8 reserved_5; + __u8 more_status_flags; + char rest[200]; +} __attribute__ ((packed)); + +#define FLG_SYSTEM_HOLD 0x04 +#define FLG_CP_DUMP 0x10 +#define FLG_USER_HOLD 0x20 +#define FLG_IN_USE 0x80 + +/* + * A struct urdev is created for each ur device that is made available + * via the ccw_device driver model. + */ +struct urdev { + struct ccw_device *cdev; /* Backpointer to ccw device */ + struct mutex io_mutex; /* Serialises device IO */ + struct completion *io_done; /* do_ur_io waits; irq completes */ + struct device *device; + struct cdev *char_device; + struct ccw_dev_id dev_id; /* device id */ + size_t reclen; /* Record length for *write* CCWs */ + int class; /* VM device class */ + int io_request_rc; /* return code from I/O request */ + refcount_t ref_count; /* reference counter */ + wait_queue_head_t wait; /* wait queue to serialize open */ + int open_flag; /* "urdev is open" flag */ + spinlock_t open_lock; /* serialize critical sections */ +}; + +/* + * A struct urfile is allocated at open() time for each device and + * freed on release(). + */ +struct urfile { + struct urdev *urd; + unsigned int flags; + size_t dev_reclen; + __u16 file_reclen; +}; + +/* + * Device major/minor definitions. + */ + +#define UR_MAJOR 0 /* get dynamic major */ +/* + * We map minor numbers directly to device numbers (0-FFFF) for simplicity. + * This avoids having to allocate (and manage) slot numbers. + */ +#define NUM_MINORS 65536 + +/* Limiting each I/O to 511 records limits chan prog to 4KB (511 r/w + 1 NOP) */ +#define MAX_RECS_PER_IO 511 +#define WRITE_CCW_CMD 0x01 + +#define TRACE(x...) debug_sprintf_event(vmur_dbf, 1, x) +#define CCWDEV_CU_DI(cutype, di) \ + CCW_DEVICE(cutype, 0x00), .driver_info = (di) + +#define FILE_RECLEN_OFFSET 4064 /* reclen offset in spool data block */ + +#endif /* _VMUR_H_ */ diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c new file mode 100644 index 000000000..76d3c50bf --- /dev/null +++ b/drivers/s390/char/zcore.c @@ -0,0 +1,366 @@ +// SPDX-License-Identifier: GPL-1.0+ +/* + * zcore module to export memory content and register sets for creating system + * dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same + * dump format as s390 standalone dumps. + * + * For more information please refer to Documentation/s390/zfcpdump.txt + * + * Copyright IBM Corp. 2003, 2008 + * Author(s): Michael Holzheu + */ + +#define KMSG_COMPONENT "zdump" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "sclp.h" + +#define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) + +#define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */ + +enum arch_id { + ARCH_S390 = 0, + ARCH_S390X = 1, +}; + +struct ipib_info { + unsigned long ipib; + u32 checksum; +} __attribute__((packed)); + +static struct debug_info *zcore_dbf; +static int hsa_available; +static struct dentry *zcore_dir; +static struct dentry *zcore_memmap_file; +static struct dentry *zcore_reipl_file; +static struct dentry *zcore_hsa_file; +static struct ipl_parameter_block *ipl_block; + +static char hsa_buf[PAGE_SIZE] __aligned(PAGE_SIZE); + +/* + * Copy memory from HSA to user memory (not reentrant): + * + * @dest: User buffer where memory should be copied to + * @src: Start address within HSA where data should be copied + * @count: Size of buffer, which should be copied + */ +int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count) +{ + unsigned long offset, bytes; + + if (!hsa_available) + return -ENODATA; + + while (count) { + if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) { + TRACE("sclp_sdias_copy() failed\n"); + return -EIO; + } + offset = src % PAGE_SIZE; + bytes = min(PAGE_SIZE - offset, count); + if (copy_to_user(dest, hsa_buf + offset, bytes)) + return -EFAULT; + src += bytes; + dest += bytes; + count -= bytes; + } + return 0; +} + +/* + * Copy memory from HSA to kernel memory (not reentrant): + * + * @dest: Kernel or user buffer where memory should be copied to + * @src: Start address within HSA where data should be copied + * @count: Size of buffer, which should be copied + */ +int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count) +{ + unsigned long offset, bytes; + + if (!hsa_available) + return -ENODATA; + + while (count) { + if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) { + TRACE("sclp_sdias_copy() failed\n"); + return -EIO; + } + offset = src % PAGE_SIZE; + bytes = min(PAGE_SIZE - offset, count); + memcpy(dest, hsa_buf + offset, bytes); + src += bytes; + dest += bytes; + count -= bytes; + } + return 0; +} + +static int __init init_cpu_info(void) +{ + struct save_area *sa; + + /* get info for boot cpu from lowcore, stored in the HSA */ + sa = save_area_boot_cpu(); + if (!sa) + return -ENOMEM; + if (memcpy_hsa_kernel(hsa_buf, __LC_FPREGS_SAVE_AREA, 512) < 0) { + TRACE("could not copy from HSA\n"); + return -EIO; + } + save_area_add_regs(sa, hsa_buf); /* vx registers are saved in smp.c */ + return 0; +} + +/* + * Release the HSA + */ +static void release_hsa(void) +{ + diag308(DIAG308_REL_HSA, NULL); + hsa_available = 0; +} + +static ssize_t zcore_memmap_read(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + return simple_read_from_buffer(buf, count, ppos, filp->private_data, + memblock.memory.cnt * CHUNK_INFO_SIZE); +} + +static int zcore_memmap_open(struct inode *inode, struct file *filp) +{ + struct memblock_region *reg; + char *buf; + int i = 0; + + buf = kcalloc(memblock.memory.cnt, CHUNK_INFO_SIZE, GFP_KERNEL); + if (!buf) { + return -ENOMEM; + } + for_each_memblock(memory, reg) { + sprintf(buf + (i++ * CHUNK_INFO_SIZE), "%016llx %016llx ", + (unsigned long long) reg->base, + (unsigned long long) reg->size); + } + filp->private_data = buf; + return nonseekable_open(inode, filp); +} + +static int zcore_memmap_release(struct inode *inode, struct file *filp) +{ + kfree(filp->private_data); + return 0; +} + +static const struct file_operations zcore_memmap_fops = { + .owner = THIS_MODULE, + .read = zcore_memmap_read, + .open = zcore_memmap_open, + .release = zcore_memmap_release, + .llseek = no_llseek, +}; + +static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf, + size_t count, loff_t *ppos) +{ + if (ipl_block) { + diag308(DIAG308_SET, ipl_block); + diag308(DIAG308_LOAD_CLEAR, NULL); + } + return count; +} + +static int zcore_reipl_open(struct inode *inode, struct file *filp) +{ + return nonseekable_open(inode, filp); +} + +static int zcore_reipl_release(struct inode *inode, struct file *filp) +{ + return 0; +} + +static const struct file_operations zcore_reipl_fops = { + .owner = THIS_MODULE, + .write = zcore_reipl_write, + .open = zcore_reipl_open, + .release = zcore_reipl_release, + .llseek = no_llseek, +}; + +static ssize_t zcore_hsa_read(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + static char str[18]; + + if (hsa_available) + snprintf(str, sizeof(str), "%lx\n", sclp.hsa_size); + else + snprintf(str, sizeof(str), "0\n"); + return simple_read_from_buffer(buf, count, ppos, str, strlen(str)); +} + +static ssize_t zcore_hsa_write(struct file *filp, const char __user *buf, + size_t count, loff_t *ppos) +{ + char value; + + if (*ppos != 0) + return -EPIPE; + if (copy_from_user(&value, buf, 1)) + return -EFAULT; + if (value != '0') + return -EINVAL; + release_hsa(); + return count; +} + +static const struct file_operations zcore_hsa_fops = { + .owner = THIS_MODULE, + .write = zcore_hsa_write, + .read = zcore_hsa_read, + .open = nonseekable_open, + .llseek = no_llseek, +}; + +static int __init check_sdias(void) +{ + if (!sclp.hsa_size) { + TRACE("Could not determine HSA size\n"); + return -ENODEV; + } + return 0; +} + +/* + * Provide IPL parameter information block from either HSA or memory + * for future reipl + */ +static int __init zcore_reipl_init(void) +{ + struct ipib_info ipib_info; + int rc; + + rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info)); + if (rc) + return rc; + if (ipib_info.ipib == 0) + return 0; + ipl_block = (void *) __get_free_page(GFP_KERNEL); + if (!ipl_block) + return -ENOMEM; + if (ipib_info.ipib < sclp.hsa_size) + rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE); + else + rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE); + if (rc || (__force u32)csum_partial(ipl_block, ipl_block->hdr.len, 0) != + ipib_info.checksum) { + TRACE("Checksum does not match\n"); + free_page((unsigned long) ipl_block); + ipl_block = NULL; + } + return 0; +} + +static int __init zcore_init(void) +{ + unsigned char arch; + int rc; + + if (ipl_info.type != IPL_TYPE_FCP_DUMP) + return -ENODATA; + if (OLDMEM_BASE) + return -ENODATA; + + zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long)); + debug_register_view(zcore_dbf, &debug_sprintf_view); + debug_set_level(zcore_dbf, 6); + + TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno); + TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn); + TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun); + + rc = sclp_sdias_init(); + if (rc) + goto fail; + + rc = check_sdias(); + if (rc) + goto fail; + hsa_available = 1; + + rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1); + if (rc) + goto fail; + + if (arch == ARCH_S390) { + pr_alert("The 64-bit dump tool cannot be used for a " + "32-bit system\n"); + rc = -EINVAL; + goto fail; + } + + pr_alert("The dump process started for a 64-bit operating system\n"); + rc = init_cpu_info(); + if (rc) + goto fail; + + rc = zcore_reipl_init(); + if (rc) + goto fail; + + zcore_dir = debugfs_create_dir("zcore" , NULL); + if (!zcore_dir) { + rc = -ENOMEM; + goto fail; + } + zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir, + NULL, &zcore_memmap_fops); + if (!zcore_memmap_file) { + rc = -ENOMEM; + goto fail_dir; + } + zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir, + NULL, &zcore_reipl_fops); + if (!zcore_reipl_file) { + rc = -ENOMEM; + goto fail_memmap_file; + } + zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir, + NULL, &zcore_hsa_fops); + if (!zcore_hsa_file) { + rc = -ENOMEM; + goto fail_reipl_file; + } + return 0; + +fail_reipl_file: + debugfs_remove(zcore_reipl_file); +fail_memmap_file: + debugfs_remove(zcore_memmap_file); +fail_dir: + debugfs_remove(zcore_dir); +fail: + diag308(DIAG308_REL_HSA, NULL); + return rc; +} +subsys_initcall(zcore_init); diff --git a/drivers/s390/cio/Makefile b/drivers/s390/cio/Makefile new file mode 100644 index 000000000..f230516ab --- /dev/null +++ b/drivers/s390/cio/Makefile @@ -0,0 +1,24 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the S/390 common i/o drivers +# + +# The following is required for define_trace.h to find ./trace.h +CFLAGS_trace.o := -I$(src) +CFLAGS_vfio_ccw_fsm.o := -I$(src) + +obj-y += airq.o blacklist.o chsc.o cio.o css.o chp.o idset.o isc.o \ + fcx.o itcw.o crw.o ccwreq.o trace.o ioasm.o +ccw_device-objs += device.o device_fsm.o device_ops.o +ccw_device-objs += device_id.o device_pgid.o device_status.o +obj-y += ccw_device.o cmf.o +obj-$(CONFIG_CHSC_SCH) += chsc_sch.o +obj-$(CONFIG_EADM_SCH) += eadm_sch.o +obj-$(CONFIG_SCM_BUS) += scm.o +obj-$(CONFIG_CCWGROUP) += ccwgroup.o + +qdio-objs := qdio_main.o qdio_thinint.o qdio_debug.o qdio_setup.o +obj-$(CONFIG_QDIO) += qdio.o + +vfio_ccw-objs += vfio_ccw_drv.o vfio_ccw_cp.o vfio_ccw_ops.o vfio_ccw_fsm.o +obj-$(CONFIG_VFIO_CCW) += vfio_ccw.o diff --git a/drivers/s390/cio/airq.c b/drivers/s390/cio/airq.c new file mode 100644 index 000000000..a45011e45 --- /dev/null +++ b/drivers/s390/cio/airq.c @@ -0,0 +1,277 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support for adapter interruptions + * + * Copyright IBM Corp. 1999, 2007 + * Author(s): Ingo Adlung + * Cornelia Huck + * Arnd Bergmann + * Peter Oberparleiter + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "cio.h" +#include "cio_debug.h" +#include "ioasm.h" + +static DEFINE_SPINLOCK(airq_lists_lock); +static struct hlist_head airq_lists[MAX_ISC+1]; + +/** + * register_adapter_interrupt() - register adapter interrupt handler + * @airq: pointer to adapter interrupt descriptor + * + * Returns 0 on success, or -EINVAL. + */ +int register_adapter_interrupt(struct airq_struct *airq) +{ + char dbf_txt[32]; + + if (!airq->handler || airq->isc > MAX_ISC) + return -EINVAL; + if (!airq->lsi_ptr) { + airq->lsi_ptr = kzalloc(1, GFP_KERNEL); + if (!airq->lsi_ptr) + return -ENOMEM; + airq->flags |= AIRQ_PTR_ALLOCATED; + } + if (!airq->lsi_mask) + airq->lsi_mask = 0xff; + snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%p", airq); + CIO_TRACE_EVENT(4, dbf_txt); + isc_register(airq->isc); + spin_lock(&airq_lists_lock); + hlist_add_head_rcu(&airq->list, &airq_lists[airq->isc]); + spin_unlock(&airq_lists_lock); + return 0; +} +EXPORT_SYMBOL(register_adapter_interrupt); + +/** + * unregister_adapter_interrupt - unregister adapter interrupt handler + * @airq: pointer to adapter interrupt descriptor + */ +void unregister_adapter_interrupt(struct airq_struct *airq) +{ + char dbf_txt[32]; + + if (hlist_unhashed(&airq->list)) + return; + snprintf(dbf_txt, sizeof(dbf_txt), "urairq:%p", airq); + CIO_TRACE_EVENT(4, dbf_txt); + spin_lock(&airq_lists_lock); + hlist_del_rcu(&airq->list); + spin_unlock(&airq_lists_lock); + synchronize_rcu(); + isc_unregister(airq->isc); + if (airq->flags & AIRQ_PTR_ALLOCATED) { + kfree(airq->lsi_ptr); + airq->lsi_ptr = NULL; + airq->flags &= ~AIRQ_PTR_ALLOCATED; + } +} +EXPORT_SYMBOL(unregister_adapter_interrupt); + +static irqreturn_t do_airq_interrupt(int irq, void *dummy) +{ + struct tpi_info *tpi_info; + struct airq_struct *airq; + struct hlist_head *head; + + set_cpu_flag(CIF_NOHZ_DELAY); + tpi_info = (struct tpi_info *) &get_irq_regs()->int_code; + trace_s390_cio_adapter_int(tpi_info); + head = &airq_lists[tpi_info->isc]; + rcu_read_lock(); + hlist_for_each_entry_rcu(airq, head, list) + if ((*airq->lsi_ptr & airq->lsi_mask) != 0) + airq->handler(airq); + rcu_read_unlock(); + + return IRQ_HANDLED; +} + +static struct irqaction airq_interrupt = { + .name = "AIO", + .handler = do_airq_interrupt, +}; + +void __init init_airq_interrupts(void) +{ + irq_set_chip_and_handler(THIN_INTERRUPT, + &dummy_irq_chip, handle_percpu_irq); + setup_irq(THIN_INTERRUPT, &airq_interrupt); +} + +/** + * airq_iv_create - create an interrupt vector + * @bits: number of bits in the interrupt vector + * @flags: allocation flags + * + * Returns a pointer to an interrupt vector structure + */ +struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags) +{ + struct airq_iv *iv; + unsigned long size; + + iv = kzalloc(sizeof(*iv), GFP_KERNEL); + if (!iv) + goto out; + iv->bits = bits; + size = BITS_TO_LONGS(bits) * sizeof(unsigned long); + iv->vector = kzalloc(size, GFP_KERNEL); + if (!iv->vector) + goto out_free; + if (flags & AIRQ_IV_ALLOC) { + iv->avail = kmalloc(size, GFP_KERNEL); + if (!iv->avail) + goto out_free; + memset(iv->avail, 0xff, size); + iv->end = 0; + } else + iv->end = bits; + if (flags & AIRQ_IV_BITLOCK) { + iv->bitlock = kzalloc(size, GFP_KERNEL); + if (!iv->bitlock) + goto out_free; + } + if (flags & AIRQ_IV_PTR) { + size = bits * sizeof(unsigned long); + iv->ptr = kzalloc(size, GFP_KERNEL); + if (!iv->ptr) + goto out_free; + } + if (flags & AIRQ_IV_DATA) { + size = bits * sizeof(unsigned int); + iv->data = kzalloc(size, GFP_KERNEL); + if (!iv->data) + goto out_free; + } + spin_lock_init(&iv->lock); + return iv; + +out_free: + kfree(iv->ptr); + kfree(iv->bitlock); + kfree(iv->avail); + kfree(iv->vector); + kfree(iv); +out: + return NULL; +} +EXPORT_SYMBOL(airq_iv_create); + +/** + * airq_iv_release - release an interrupt vector + * @iv: pointer to interrupt vector structure + */ +void airq_iv_release(struct airq_iv *iv) +{ + kfree(iv->data); + kfree(iv->ptr); + kfree(iv->bitlock); + kfree(iv->vector); + kfree(iv->avail); + kfree(iv); +} +EXPORT_SYMBOL(airq_iv_release); + +/** + * airq_iv_alloc - allocate irq bits from an interrupt vector + * @iv: pointer to an interrupt vector structure + * @num: number of consecutive irq bits to allocate + * + * Returns the bit number of the first irq in the allocated block of irqs, + * or -1UL if no bit is available or the AIRQ_IV_ALLOC flag has not been + * specified + */ +unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num) +{ + unsigned long bit, i, flags; + + if (!iv->avail || num == 0) + return -1UL; + spin_lock_irqsave(&iv->lock, flags); + bit = find_first_bit_inv(iv->avail, iv->bits); + while (bit + num <= iv->bits) { + for (i = 1; i < num; i++) + if (!test_bit_inv(bit + i, iv->avail)) + break; + if (i >= num) { + /* Found a suitable block of irqs */ + for (i = 0; i < num; i++) + clear_bit_inv(bit + i, iv->avail); + if (bit + num >= iv->end) + iv->end = bit + num + 1; + break; + } + bit = find_next_bit_inv(iv->avail, iv->bits, bit + i + 1); + } + if (bit + num > iv->bits) + bit = -1UL; + spin_unlock_irqrestore(&iv->lock, flags); + return bit; +} +EXPORT_SYMBOL(airq_iv_alloc); + +/** + * airq_iv_free - free irq bits of an interrupt vector + * @iv: pointer to interrupt vector structure + * @bit: number of the first irq bit to free + * @num: number of consecutive irq bits to free + */ +void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num) +{ + unsigned long i, flags; + + if (!iv->avail || num == 0) + return; + spin_lock_irqsave(&iv->lock, flags); + for (i = 0; i < num; i++) { + /* Clear (possibly left over) interrupt bit */ + clear_bit_inv(bit + i, iv->vector); + /* Make the bit positions available again */ + set_bit_inv(bit + i, iv->avail); + } + if (bit + num >= iv->end) { + /* Find new end of bit-field */ + while (iv->end > 0 && !test_bit_inv(iv->end - 1, iv->avail)) + iv->end--; + } + spin_unlock_irqrestore(&iv->lock, flags); +} +EXPORT_SYMBOL(airq_iv_free); + +/** + * airq_iv_scan - scan interrupt vector for non-zero bits + * @iv: pointer to interrupt vector structure + * @start: bit number to start the search + * @end: bit number to end the search + * + * Returns the bit number of the next non-zero interrupt bit, or + * -1UL if the scan completed without finding any more any non-zero bits. + */ +unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start, + unsigned long end) +{ + unsigned long bit; + + /* Find non-zero bit starting from 'ivs->next'. */ + bit = find_next_bit_inv(iv->vector, end, start); + if (bit >= end) + return -1UL; + clear_bit_inv(bit, iv->vector); + return bit; +} +EXPORT_SYMBOL(airq_iv_scan); diff --git a/drivers/s390/cio/blacklist.c b/drivers/s390/cio/blacklist.c new file mode 100644 index 000000000..9cebff8e8 --- /dev/null +++ b/drivers/s390/cio/blacklist.c @@ -0,0 +1,424 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * S/390 common I/O routines -- blacklisting of specific devices + * + * Copyright IBM Corp. 1999, 2013 + * Author(s): Ingo Adlung (adlung@de.ibm.com) + * Cornelia Huck (cornelia.huck@de.ibm.com) + * Arnd Bergmann (arndb@de.ibm.com) + */ + +#define KMSG_COMPONENT "cio" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "blacklist.h" +#include "cio.h" +#include "cio_debug.h" +#include "css.h" +#include "device.h" + +/* + * "Blacklisting" of certain devices: + * Device numbers given in the commandline as cio_ignore=... won't be known + * to Linux. + * + * These can be single devices or ranges of devices + */ + +/* 65536 bits for each set to indicate if a devno is blacklisted or not */ +#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ + (8*sizeof(long))) +static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS]; +typedef enum {add, free} range_action; + +/* + * Function: blacklist_range + * (Un-)blacklist the devices from-to + */ +static int blacklist_range(range_action action, unsigned int from_ssid, + unsigned int to_ssid, unsigned int from, + unsigned int to, int msgtrigger) +{ + if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) { + if (msgtrigger) + pr_warn("0.%x.%04x to 0.%x.%04x is not a valid range for cio_ignore\n", + from_ssid, from, to_ssid, to); + + return 1; + } + + while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) && + (from <= to))) { + if (action == add) + set_bit(from, bl_dev[from_ssid]); + else + clear_bit(from, bl_dev[from_ssid]); + from++; + if (from > __MAX_SUBCHANNEL) { + from_ssid++; + from = 0; + } + } + + return 0; +} + +static int pure_hex(char **cp, unsigned int *val, int min_digit, + int max_digit, int max_val) +{ + int diff; + + diff = 0; + *val = 0; + + while (diff <= max_digit) { + int value = hex_to_bin(**cp); + + if (value < 0) + break; + *val = *val * 16 + value; + (*cp)++; + diff++; + } + + if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) + return 1; + + return 0; +} + +static int parse_busid(char *str, unsigned int *cssid, unsigned int *ssid, + unsigned int *devno, int msgtrigger) +{ + char *str_work; + int val, rc, ret; + + rc = 1; + + if (*str == '\0') + goto out; + + /* old style */ + str_work = str; + val = simple_strtoul(str, &str_work, 16); + + if (*str_work == '\0') { + if (val <= __MAX_SUBCHANNEL) { + *devno = val; + *ssid = 0; + *cssid = 0; + rc = 0; + } + goto out; + } + + /* new style */ + str_work = str; + ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); + if (ret || (str_work[0] != '.')) + goto out; + str_work++; + ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); + if (ret || (str_work[0] != '.')) + goto out; + str_work++; + ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); + if (ret || (str_work[0] != '\0')) + goto out; + + rc = 0; +out: + if (rc && msgtrigger) + pr_warn("%s is not a valid device for the cio_ignore kernel parameter\n", + str); + + return rc; +} + +static int blacklist_parse_parameters(char *str, range_action action, + int msgtrigger) +{ + unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; + int rc, totalrc; + char *parm; + range_action ra; + + totalrc = 0; + + while ((parm = strsep(&str, ","))) { + rc = 0; + ra = action; + if (*parm == '!') { + if (ra == add) + ra = free; + else + ra = add; + parm++; + } + if (strcmp(parm, "all") == 0) { + from_cssid = 0; + from_ssid = 0; + from = 0; + to_cssid = __MAX_CSSID; + to_ssid = __MAX_SSID; + to = __MAX_SUBCHANNEL; + } else if (strcmp(parm, "ipldev") == 0) { + if (ipl_info.type == IPL_TYPE_CCW) { + from_cssid = 0; + from_ssid = ipl_info.data.ccw.dev_id.ssid; + from = ipl_info.data.ccw.dev_id.devno; + } else if (ipl_info.type == IPL_TYPE_FCP || + ipl_info.type == IPL_TYPE_FCP_DUMP) { + from_cssid = 0; + from_ssid = ipl_info.data.fcp.dev_id.ssid; + from = ipl_info.data.fcp.dev_id.devno; + } else { + continue; + } + to_cssid = from_cssid; + to_ssid = from_ssid; + to = from; + } else if (strcmp(parm, "condev") == 0) { + if (console_devno == -1) + continue; + + from_cssid = to_cssid = 0; + from_ssid = to_ssid = 0; + from = to = console_devno; + } else { + rc = parse_busid(strsep(&parm, "-"), &from_cssid, + &from_ssid, &from, msgtrigger); + if (!rc) { + if (parm != NULL) + rc = parse_busid(parm, &to_cssid, + &to_ssid, &to, + msgtrigger); + else { + to_cssid = from_cssid; + to_ssid = from_ssid; + to = from; + } + } + } + if (!rc) { + rc = blacklist_range(ra, from_ssid, to_ssid, from, to, + msgtrigger); + if (rc) + totalrc = -EINVAL; + } else + totalrc = -EINVAL; + } + + return totalrc; +} + +static int __init +blacklist_setup (char *str) +{ + CIO_MSG_EVENT(6, "Reading blacklist parameters\n"); + if (blacklist_parse_parameters(str, add, 1)) + return 0; + return 1; +} + +__setup ("cio_ignore=", blacklist_setup); + +/* Checking if devices are blacklisted */ + +/* + * Function: is_blacklisted + * Returns 1 if the given devicenumber can be found in the blacklist, + * otherwise 0. + * Used by validate_subchannel() + */ +int +is_blacklisted (int ssid, int devno) +{ + return test_bit (devno, bl_dev[ssid]); +} + +#ifdef CONFIG_PROC_FS +/* + * Function: blacklist_parse_proc_parameters + * parse the stuff which is piped to /proc/cio_ignore + */ +static int blacklist_parse_proc_parameters(char *buf) +{ + int rc; + char *parm; + + parm = strsep(&buf, " "); + + if (strcmp("free", parm) == 0) { + rc = blacklist_parse_parameters(buf, free, 0); + css_schedule_eval_all_unreg(0); + } else if (strcmp("add", parm) == 0) + rc = blacklist_parse_parameters(buf, add, 0); + else if (strcmp("purge", parm) == 0) + return ccw_purge_blacklisted(); + else + return -EINVAL; + + + return rc; +} + +/* Iterator struct for all devices. */ +struct ccwdev_iter { + int devno; + int ssid; + int in_range; +}; + +static void * +cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset) +{ + struct ccwdev_iter *iter = s->private; + + if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) + return NULL; + memset(iter, 0, sizeof(*iter)); + iter->ssid = *offset / (__MAX_SUBCHANNEL + 1); + iter->devno = *offset % (__MAX_SUBCHANNEL + 1); + return iter; +} + +static void +cio_ignore_proc_seq_stop(struct seq_file *s, void *it) +{ +} + +static void * +cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset) +{ + struct ccwdev_iter *iter; + loff_t p = *offset; + + (*offset)++; + if (p >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1)) + return NULL; + iter = it; + if (iter->devno == __MAX_SUBCHANNEL) { + iter->devno = 0; + iter->ssid++; + if (iter->ssid > __MAX_SSID) + return NULL; + } else + iter->devno++; + return iter; +} + +static int +cio_ignore_proc_seq_show(struct seq_file *s, void *it) +{ + struct ccwdev_iter *iter; + + iter = it; + if (!is_blacklisted(iter->ssid, iter->devno)) + /* Not blacklisted, nothing to output. */ + return 0; + if (!iter->in_range) { + /* First device in range. */ + if ((iter->devno == __MAX_SUBCHANNEL) || + !is_blacklisted(iter->ssid, iter->devno + 1)) { + /* Singular device. */ + seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno); + return 0; + } + iter->in_range = 1; + seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno); + return 0; + } + if ((iter->devno == __MAX_SUBCHANNEL) || + !is_blacklisted(iter->ssid, iter->devno + 1)) { + /* Last device in range. */ + iter->in_range = 0; + seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno); + } + return 0; +} + +static ssize_t +cio_ignore_write(struct file *file, const char __user *user_buf, + size_t user_len, loff_t *offset) +{ + char *buf; + ssize_t rc, ret, i; + + if (*offset) + return -EINVAL; + if (user_len > 65536) + user_len = 65536; + buf = vzalloc(user_len + 1); /* maybe better use the stack? */ + if (buf == NULL) + return -ENOMEM; + + if (strncpy_from_user (buf, user_buf, user_len) < 0) { + rc = -EFAULT; + goto out_free; + } + + i = user_len - 1; + while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) { + buf[i] = '\0'; + i--; + } + ret = blacklist_parse_proc_parameters(buf); + if (ret) + rc = ret; + else + rc = user_len; + +out_free: + vfree (buf); + return rc; +} + +static const struct seq_operations cio_ignore_proc_seq_ops = { + .start = cio_ignore_proc_seq_start, + .stop = cio_ignore_proc_seq_stop, + .next = cio_ignore_proc_seq_next, + .show = cio_ignore_proc_seq_show, +}; + +static int +cio_ignore_proc_open(struct inode *inode, struct file *file) +{ + return seq_open_private(file, &cio_ignore_proc_seq_ops, + sizeof(struct ccwdev_iter)); +} + +static const struct file_operations cio_ignore_proc_fops = { + .open = cio_ignore_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, + .write = cio_ignore_write, +}; + +static int +cio_ignore_proc_init (void) +{ + struct proc_dir_entry *entry; + + entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL, + &cio_ignore_proc_fops); + if (!entry) + return -ENOENT; + return 0; +} + +__initcall (cio_ignore_proc_init); + +#endif /* CONFIG_PROC_FS */ diff --git a/drivers/s390/cio/blacklist.h b/drivers/s390/cio/blacklist.h new file mode 100644 index 000000000..140e3e4ee --- /dev/null +++ b/drivers/s390/cio/blacklist.h @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef S390_BLACKLIST_H +#define S390_BLACKLIST_H + +extern int is_blacklisted (int ssid, int devno); + +#endif diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c new file mode 100644 index 000000000..674d848e3 --- /dev/null +++ b/drivers/s390/cio/ccwgroup.c @@ -0,0 +1,656 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * bus driver for ccwgroup + * + * Copyright IBM Corp. 2002, 2012 + * + * Author(s): Arnd Bergmann (arndb@de.ibm.com) + * Cornelia Huck (cornelia.huck@de.ibm.com) + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "device.h" + +#define CCW_BUS_ID_SIZE 10 + +/* In Linux 2.4, we had a channel device layer called "chandev" + * that did all sorts of obscure stuff for networking devices. + * This is another driver that serves as a replacement for just + * one of its functions, namely the translation of single subchannels + * to devices that use multiple subchannels. + */ + +static struct bus_type ccwgroup_bus_type; + +static void __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev) +{ + int i; + char str[16]; + + for (i = 0; i < gdev->count; i++) { + sprintf(str, "cdev%d", i); + sysfs_remove_link(&gdev->dev.kobj, str); + sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device"); + } +} + +/* + * Remove references from ccw devices to ccw group device and from + * ccw group device to ccw devices. + */ +static void __ccwgroup_remove_cdev_refs(struct ccwgroup_device *gdev) +{ + struct ccw_device *cdev; + int i; + + for (i = 0; i < gdev->count; i++) { + cdev = gdev->cdev[i]; + if (!cdev) + continue; + spin_lock_irq(cdev->ccwlock); + dev_set_drvdata(&cdev->dev, NULL); + spin_unlock_irq(cdev->ccwlock); + gdev->cdev[i] = NULL; + put_device(&cdev->dev); + } +} + +/** + * ccwgroup_set_online() - enable a ccwgroup device + * @gdev: target ccwgroup device + * + * This function attempts to put the ccwgroup device into the online state. + * Returns: + * %0 on success and a negative error value on failure. + */ +int ccwgroup_set_online(struct ccwgroup_device *gdev) +{ + struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); + int ret = -EINVAL; + + if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) + return -EAGAIN; + if (gdev->state == CCWGROUP_ONLINE) + goto out; + if (gdrv->set_online) + ret = gdrv->set_online(gdev); + if (ret) + goto out; + + gdev->state = CCWGROUP_ONLINE; +out: + atomic_set(&gdev->onoff, 0); + return ret; +} +EXPORT_SYMBOL(ccwgroup_set_online); + +/** + * ccwgroup_set_offline() - disable a ccwgroup device + * @gdev: target ccwgroup device + * + * This function attempts to put the ccwgroup device into the offline state. + * Returns: + * %0 on success and a negative error value on failure. + */ +int ccwgroup_set_offline(struct ccwgroup_device *gdev) +{ + struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); + int ret = -EINVAL; + + if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) + return -EAGAIN; + if (gdev->state == CCWGROUP_OFFLINE) + goto out; + if (gdrv->set_offline) + ret = gdrv->set_offline(gdev); + if (ret) + goto out; + + gdev->state = CCWGROUP_OFFLINE; +out: + atomic_set(&gdev->onoff, 0); + return ret; +} +EXPORT_SYMBOL(ccwgroup_set_offline); + +static ssize_t ccwgroup_online_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + unsigned long value; + int ret; + + device_lock(dev); + if (!dev->driver) { + ret = -EINVAL; + goto out; + } + + ret = kstrtoul(buf, 0, &value); + if (ret) + goto out; + + if (value == 1) + ret = ccwgroup_set_online(gdev); + else if (value == 0) + ret = ccwgroup_set_offline(gdev); + else + ret = -EINVAL; +out: + device_unlock(dev); + return (ret == 0) ? count : ret; +} + +static ssize_t ccwgroup_online_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + int online; + + online = (gdev->state == CCWGROUP_ONLINE) ? 1 : 0; + + return scnprintf(buf, PAGE_SIZE, "%d\n", online); +} + +/* + * Provide an 'ungroup' attribute so the user can remove group devices no + * longer needed or accidentially created. Saves memory :) + */ +static void ccwgroup_ungroup(struct ccwgroup_device *gdev) +{ + mutex_lock(&gdev->reg_mutex); + if (device_is_registered(&gdev->dev)) { + __ccwgroup_remove_symlinks(gdev); + device_unregister(&gdev->dev); + __ccwgroup_remove_cdev_refs(gdev); + } + mutex_unlock(&gdev->reg_mutex); +} + +static ssize_t ccwgroup_ungroup_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + int rc = 0; + + /* Prevent concurrent online/offline processing and ungrouping. */ + if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) + return -EAGAIN; + if (gdev->state != CCWGROUP_OFFLINE) { + rc = -EINVAL; + goto out; + } + + if (device_remove_file_self(dev, attr)) + ccwgroup_ungroup(gdev); + else + rc = -ENODEV; +out: + if (rc) { + /* Release onoff "lock" when ungrouping failed. */ + atomic_set(&gdev->onoff, 0); + return rc; + } + return count; +} +static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store); +static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store); + +static struct attribute *ccwgroup_attrs[] = { + &dev_attr_online.attr, + &dev_attr_ungroup.attr, + NULL, +}; +static struct attribute_group ccwgroup_attr_group = { + .attrs = ccwgroup_attrs, +}; +static const struct attribute_group *ccwgroup_attr_groups[] = { + &ccwgroup_attr_group, + NULL, +}; + +static void ccwgroup_ungroup_workfn(struct work_struct *work) +{ + struct ccwgroup_device *gdev = + container_of(work, struct ccwgroup_device, ungroup_work); + + ccwgroup_ungroup(gdev); + put_device(&gdev->dev); +} + +static void ccwgroup_release(struct device *dev) +{ + kfree(to_ccwgroupdev(dev)); +} + +static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev) +{ + char str[16]; + int i, rc; + + for (i = 0; i < gdev->count; i++) { + rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, + &gdev->dev.kobj, "group_device"); + if (rc) { + for (--i; i >= 0; i--) + sysfs_remove_link(&gdev->cdev[i]->dev.kobj, + "group_device"); + return rc; + } + } + for (i = 0; i < gdev->count; i++) { + sprintf(str, "cdev%d", i); + rc = sysfs_create_link(&gdev->dev.kobj, + &gdev->cdev[i]->dev.kobj, str); + if (rc) { + for (--i; i >= 0; i--) { + sprintf(str, "cdev%d", i); + sysfs_remove_link(&gdev->dev.kobj, str); + } + for (i = 0; i < gdev->count; i++) + sysfs_remove_link(&gdev->cdev[i]->dev.kobj, + "group_device"); + return rc; + } + } + return 0; +} + +static int __get_next_id(const char **buf, struct ccw_dev_id *id) +{ + unsigned int cssid, ssid, devno; + int ret = 0, len; + char *start, *end; + + start = (char *)*buf; + end = strchr(start, ','); + if (!end) { + /* Last entry. Strip trailing newline, if applicable. */ + end = strchr(start, '\n'); + if (end) + *end = '\0'; + len = strlen(start) + 1; + } else { + len = end - start + 1; + end++; + } + if (len <= CCW_BUS_ID_SIZE) { + if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3) + ret = -EINVAL; + } else + ret = -EINVAL; + + if (!ret) { + id->ssid = ssid; + id->devno = devno; + } + *buf = end; + return ret; +} + +/** + * ccwgroup_create_dev() - create and register a ccw group device + * @parent: parent device for the new device + * @gdrv: driver for the new group device + * @num_devices: number of slave devices + * @buf: buffer containing comma separated bus ids of slave devices + * + * Create and register a new ccw group device as a child of @parent. Slave + * devices are obtained from the list of bus ids given in @buf. + * Returns: + * %0 on success and an error code on failure. + * Context: + * non-atomic + */ +int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv, + int num_devices, const char *buf) +{ + struct ccwgroup_device *gdev; + struct ccw_dev_id dev_id; + int rc, i; + + if (num_devices < 1) + return -EINVAL; + + gdev = kzalloc(struct_size(gdev, cdev, num_devices), GFP_KERNEL); + if (!gdev) + return -ENOMEM; + + atomic_set(&gdev->onoff, 0); + mutex_init(&gdev->reg_mutex); + mutex_lock(&gdev->reg_mutex); + INIT_WORK(&gdev->ungroup_work, ccwgroup_ungroup_workfn); + gdev->count = num_devices; + gdev->dev.bus = &ccwgroup_bus_type; + gdev->dev.parent = parent; + gdev->dev.release = ccwgroup_release; + device_initialize(&gdev->dev); + + for (i = 0; i < num_devices && buf; i++) { + rc = __get_next_id(&buf, &dev_id); + if (rc != 0) + goto error; + gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id); + /* + * All devices have to be of the same type in + * order to be grouped. + */ + if (!gdev->cdev[i] || !gdev->cdev[i]->drv || + gdev->cdev[i]->drv != gdev->cdev[0]->drv || + gdev->cdev[i]->id.driver_info != + gdev->cdev[0]->id.driver_info) { + rc = -EINVAL; + goto error; + } + /* Don't allow a device to belong to more than one group. */ + spin_lock_irq(gdev->cdev[i]->ccwlock); + if (dev_get_drvdata(&gdev->cdev[i]->dev)) { + spin_unlock_irq(gdev->cdev[i]->ccwlock); + rc = -EINVAL; + goto error; + } + dev_set_drvdata(&gdev->cdev[i]->dev, gdev); + spin_unlock_irq(gdev->cdev[i]->ccwlock); + } + /* Check for sufficient number of bus ids. */ + if (i < num_devices) { + rc = -EINVAL; + goto error; + } + /* Check for trailing stuff. */ + if (i == num_devices && buf && strlen(buf) > 0) { + rc = -EINVAL; + goto error; + } + /* Check if the devices are bound to the required ccw driver. */ + if (gdrv && gdrv->ccw_driver && + gdev->cdev[0]->drv != gdrv->ccw_driver) { + rc = -EINVAL; + goto error; + } + + dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev)); + gdev->dev.groups = ccwgroup_attr_groups; + + if (gdrv) { + gdev->dev.driver = &gdrv->driver; + rc = gdrv->setup ? gdrv->setup(gdev) : 0; + if (rc) + goto error; + } + rc = device_add(&gdev->dev); + if (rc) + goto error; + rc = __ccwgroup_create_symlinks(gdev); + if (rc) { + device_del(&gdev->dev); + goto error; + } + mutex_unlock(&gdev->reg_mutex); + return 0; +error: + for (i = 0; i < num_devices; i++) + if (gdev->cdev[i]) { + spin_lock_irq(gdev->cdev[i]->ccwlock); + if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) + dev_set_drvdata(&gdev->cdev[i]->dev, NULL); + spin_unlock_irq(gdev->cdev[i]->ccwlock); + put_device(&gdev->cdev[i]->dev); + gdev->cdev[i] = NULL; + } + mutex_unlock(&gdev->reg_mutex); + put_device(&gdev->dev); + return rc; +} +EXPORT_SYMBOL(ccwgroup_create_dev); + +static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action, + void *data) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(data); + + if (action == BUS_NOTIFY_UNBIND_DRIVER) { + get_device(&gdev->dev); + schedule_work(&gdev->ungroup_work); + } + + return NOTIFY_OK; +} + +static struct notifier_block ccwgroup_nb = { + .notifier_call = ccwgroup_notifier +}; + +static int __init init_ccwgroup(void) +{ + int ret; + + ret = bus_register(&ccwgroup_bus_type); + if (ret) + return ret; + + ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb); + if (ret) + bus_unregister(&ccwgroup_bus_type); + + return ret; +} + +static void __exit cleanup_ccwgroup(void) +{ + bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb); + bus_unregister(&ccwgroup_bus_type); +} + +module_init(init_ccwgroup); +module_exit(cleanup_ccwgroup); + +/************************** driver stuff ******************************/ + +static int ccwgroup_remove(struct device *dev) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); + + if (!dev->driver) + return 0; + if (gdrv->remove) + gdrv->remove(gdev); + + return 0; +} + +static void ccwgroup_shutdown(struct device *dev) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); + + if (!dev->driver) + return; + if (gdrv->shutdown) + gdrv->shutdown(gdev); +} + +static int ccwgroup_pm_prepare(struct device *dev) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); + + /* Fail while device is being set online/offline. */ + if (atomic_read(&gdev->onoff)) + return -EAGAIN; + + if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) + return 0; + + return gdrv->prepare ? gdrv->prepare(gdev) : 0; +} + +static void ccwgroup_pm_complete(struct device *dev) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); + + if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) + return; + + if (gdrv->complete) + gdrv->complete(gdev); +} + +static int ccwgroup_pm_freeze(struct device *dev) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); + + if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) + return 0; + + return gdrv->freeze ? gdrv->freeze(gdev) : 0; +} + +static int ccwgroup_pm_thaw(struct device *dev) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); + + if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) + return 0; + + return gdrv->thaw ? gdrv->thaw(gdev) : 0; +} + +static int ccwgroup_pm_restore(struct device *dev) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); + + if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) + return 0; + + return gdrv->restore ? gdrv->restore(gdev) : 0; +} + +static const struct dev_pm_ops ccwgroup_pm_ops = { + .prepare = ccwgroup_pm_prepare, + .complete = ccwgroup_pm_complete, + .freeze = ccwgroup_pm_freeze, + .thaw = ccwgroup_pm_thaw, + .restore = ccwgroup_pm_restore, +}; + +static struct bus_type ccwgroup_bus_type = { + .name = "ccwgroup", + .remove = ccwgroup_remove, + .shutdown = ccwgroup_shutdown, + .pm = &ccwgroup_pm_ops, +}; + +bool dev_is_ccwgroup(struct device *dev) +{ + return dev->bus == &ccwgroup_bus_type; +} +EXPORT_SYMBOL(dev_is_ccwgroup); + +/** + * ccwgroup_driver_register() - register a ccw group driver + * @cdriver: driver to be registered + * + * This function is mainly a wrapper around driver_register(). + */ +int ccwgroup_driver_register(struct ccwgroup_driver *cdriver) +{ + /* register our new driver with the core */ + cdriver->driver.bus = &ccwgroup_bus_type; + + return driver_register(&cdriver->driver); +} +EXPORT_SYMBOL(ccwgroup_driver_register); + +static int __ccwgroup_match_all(struct device *dev, void *data) +{ + return 1; +} + +/** + * ccwgroup_driver_unregister() - deregister a ccw group driver + * @cdriver: driver to be deregistered + * + * This function is mainly a wrapper around driver_unregister(). + */ +void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver) +{ + struct device *dev; + + /* We don't want ccwgroup devices to live longer than their driver. */ + while ((dev = driver_find_device(&cdriver->driver, NULL, NULL, + __ccwgroup_match_all))) { + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + + ccwgroup_ungroup(gdev); + put_device(dev); + } + driver_unregister(&cdriver->driver); +} +EXPORT_SYMBOL(ccwgroup_driver_unregister); + +/** + * ccwgroup_probe_ccwdev() - probe function for slave devices + * @cdev: ccw device to be probed + * + * This is a dummy probe function for ccw devices that are slave devices in + * a ccw group device. + * Returns: + * always %0 + */ +int ccwgroup_probe_ccwdev(struct ccw_device *cdev) +{ + return 0; +} +EXPORT_SYMBOL(ccwgroup_probe_ccwdev); + +/** + * ccwgroup_remove_ccwdev() - remove function for slave devices + * @cdev: ccw device to be removed + * + * This is a remove function for ccw devices that are slave devices in a ccw + * group device. It sets the ccw device offline and also deregisters the + * embedding ccw group device. + */ +void ccwgroup_remove_ccwdev(struct ccw_device *cdev) +{ + struct ccwgroup_device *gdev; + + /* Ignore offlining errors, device is gone anyway. */ + ccw_device_set_offline(cdev); + /* If one of its devices is gone, the whole group is done for. */ + spin_lock_irq(cdev->ccwlock); + gdev = dev_get_drvdata(&cdev->dev); + if (!gdev) { + spin_unlock_irq(cdev->ccwlock); + return; + } + /* Get ccwgroup device reference for local processing. */ + get_device(&gdev->dev); + spin_unlock_irq(cdev->ccwlock); + /* Unregister group device. */ + ccwgroup_ungroup(gdev); + /* Release ccwgroup device reference for local processing. */ + put_device(&gdev->dev); +} +EXPORT_SYMBOL(ccwgroup_remove_ccwdev); +MODULE_LICENSE("GPL"); diff --git a/drivers/s390/cio/ccwreq.c b/drivers/s390/cio/ccwreq.c new file mode 100644 index 000000000..603268a33 --- /dev/null +++ b/drivers/s390/cio/ccwreq.c @@ -0,0 +1,367 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Handling of internal CCW device requests. + * + * Copyright IBM Corp. 2009, 2011 + * Author(s): Peter Oberparleiter + */ + +#define KMSG_COMPONENT "cio" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include + +#include "io_sch.h" +#include "cio.h" +#include "device.h" +#include "cio_debug.h" + +/** + * lpm_adjust - adjust path mask + * @lpm: path mask to adjust + * @mask: mask of available paths + * + * Shift @lpm right until @lpm and @mask have at least one bit in common or + * until @lpm is zero. Return the resulting lpm. + */ +int lpm_adjust(int lpm, int mask) +{ + while (lpm && ((lpm & mask) == 0)) + lpm >>= 1; + return lpm; +} + +/* + * Adjust path mask to use next path and reset retry count. Return resulting + * path mask. + */ +static u16 ccwreq_next_path(struct ccw_device *cdev) +{ + struct ccw_request *req = &cdev->private->req; + + if (!req->singlepath) { + req->mask = 0; + goto out; + } + req->retries = req->maxretries; + req->mask = lpm_adjust(req->mask >> 1, req->lpm); +out: + return req->mask; +} + +/* + * Clean up device state and report to callback. + */ +static void ccwreq_stop(struct ccw_device *cdev, int rc) +{ + struct ccw_request *req = &cdev->private->req; + + if (req->done) + return; + req->done = 1; + ccw_device_set_timeout(cdev, 0); + memset(&cdev->private->irb, 0, sizeof(struct irb)); + if (rc && rc != -ENODEV && req->drc) + rc = req->drc; + req->callback(cdev, req->data, rc); +} + +/* + * (Re-)Start the operation until retries and paths are exhausted. + */ +static void ccwreq_do(struct ccw_device *cdev) +{ + struct ccw_request *req = &cdev->private->req; + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw1 *cp = req->cp; + int rc = -EACCES; + + while (req->mask) { + if (req->retries-- == 0) { + /* Retries exhausted, try next path. */ + ccwreq_next_path(cdev); + continue; + } + /* Perform start function. */ + memset(&cdev->private->irb, 0, sizeof(struct irb)); + rc = cio_start(sch, cp, (u8) req->mask); + if (rc == 0) { + /* I/O started successfully. */ + ccw_device_set_timeout(cdev, req->timeout); + return; + } + if (rc == -ENODEV) { + /* Permanent device error. */ + break; + } + if (rc == -EACCES) { + /* Permant path error. */ + ccwreq_next_path(cdev); + continue; + } + /* Temporary improper status. */ + rc = cio_clear(sch); + if (rc) + break; + return; + } + ccwreq_stop(cdev, rc); +} + +/** + * ccw_request_start - perform I/O request + * @cdev: ccw device + * + * Perform the I/O request specified by cdev->req. + */ +void ccw_request_start(struct ccw_device *cdev) +{ + struct ccw_request *req = &cdev->private->req; + + if (req->singlepath) { + /* Try all paths twice to counter link flapping. */ + req->mask = 0x8080; + } else + req->mask = req->lpm; + + req->retries = req->maxretries; + req->mask = lpm_adjust(req->mask, req->lpm); + req->drc = 0; + req->done = 0; + req->cancel = 0; + if (!req->mask) + goto out_nopath; + ccwreq_do(cdev); + return; + +out_nopath: + ccwreq_stop(cdev, -EACCES); +} + +/** + * ccw_request_cancel - cancel running I/O request + * @cdev: ccw device + * + * Cancel the I/O request specified by cdev->req. Return non-zero if request + * has already finished, zero otherwise. + */ +int ccw_request_cancel(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + int rc; + + if (req->done) + return 1; + req->cancel = 1; + rc = cio_clear(sch); + if (rc) + ccwreq_stop(cdev, rc); + return 0; +} + +/* + * Return the status of the internal I/O started on the specified ccw device. + * Perform BASIC SENSE if required. + */ +static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb) +{ + struct irb *irb = &cdev->private->irb; + struct cmd_scsw *scsw = &irb->scsw.cmd; + enum uc_todo todo; + + /* Perform BASIC SENSE if needed. */ + if (ccw_device_accumulate_and_sense(cdev, lcirb)) + return IO_RUNNING; + /* Check for halt/clear interrupt. */ + if (scsw->fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) + return IO_KILLED; + /* Check for path error. */ + if (scsw->cc == 3 || scsw->pno) + return IO_PATH_ERROR; + /* Handle BASIC SENSE data. */ + if (irb->esw.esw0.erw.cons) { + CIO_TRACE_EVENT(2, "sensedata"); + CIO_HEX_EVENT(2, &cdev->private->dev_id, + sizeof(struct ccw_dev_id)); + CIO_HEX_EVENT(2, &cdev->private->irb.ecw, SENSE_MAX_COUNT); + /* Check for command reject. */ + if (irb->ecw[0] & SNS0_CMD_REJECT) + return IO_REJECTED; + /* Ask the driver what to do */ + if (cdev->drv && cdev->drv->uc_handler) { + todo = cdev->drv->uc_handler(cdev, lcirb); + CIO_TRACE_EVENT(2, "uc_response"); + CIO_HEX_EVENT(2, &todo, sizeof(todo)); + switch (todo) { + case UC_TODO_RETRY: + return IO_STATUS_ERROR; + case UC_TODO_RETRY_ON_NEW_PATH: + return IO_PATH_ERROR; + case UC_TODO_STOP: + return IO_REJECTED; + default: + return IO_STATUS_ERROR; + } + } + /* Assume that unexpected SENSE data implies an error. */ + return IO_STATUS_ERROR; + } + /* Check for channel errors. */ + if (scsw->cstat != 0) + return IO_STATUS_ERROR; + /* Check for device errors. */ + if (scsw->dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) + return IO_STATUS_ERROR; + /* Check for final state. */ + if (!(scsw->dstat & DEV_STAT_DEV_END)) + return IO_RUNNING; + /* Check for other improper status. */ + if (scsw->cc == 1 && (scsw->stctl & SCSW_STCTL_ALERT_STATUS)) + return IO_STATUS_ERROR; + return IO_DONE; +} + +/* + * Log ccw request status. + */ +static void ccwreq_log_status(struct ccw_device *cdev, enum io_status status) +{ + struct ccw_request *req = &cdev->private->req; + struct { + struct ccw_dev_id dev_id; + u16 retries; + u8 lpm; + u8 status; + } __attribute__ ((packed)) data; + data.dev_id = cdev->private->dev_id; + data.retries = req->retries; + data.lpm = (u8) req->mask; + data.status = (u8) status; + CIO_TRACE_EVENT(2, "reqstat"); + CIO_HEX_EVENT(2, &data, sizeof(data)); +} + +/** + * ccw_request_handler - interrupt handler for I/O request procedure. + * @cdev: ccw device + * + * Handle interrupt during I/O request procedure. + */ +void ccw_request_handler(struct ccw_device *cdev) +{ + struct irb *irb = this_cpu_ptr(&cio_irb); + struct ccw_request *req = &cdev->private->req; + enum io_status status; + int rc = -EOPNOTSUPP; + + /* Check status of I/O request. */ + status = ccwreq_status(cdev, irb); + if (req->filter) + status = req->filter(cdev, req->data, irb, status); + if (status != IO_RUNNING) + ccw_device_set_timeout(cdev, 0); + if (status != IO_DONE && status != IO_RUNNING) + ccwreq_log_status(cdev, status); + switch (status) { + case IO_DONE: + break; + case IO_RUNNING: + return; + case IO_REJECTED: + goto err; + case IO_PATH_ERROR: + goto out_next_path; + case IO_STATUS_ERROR: + goto out_restart; + case IO_KILLED: + /* Check if request was cancelled on purpose. */ + if (req->cancel) { + rc = -EIO; + goto err; + } + goto out_restart; + } + /* Check back with request initiator. */ + if (!req->check) + goto out; + switch (req->check(cdev, req->data)) { + case 0: + break; + case -EAGAIN: + goto out_restart; + case -EACCES: + goto out_next_path; + default: + goto err; + } +out: + ccwreq_stop(cdev, 0); + return; + +out_next_path: + /* Try next path and restart I/O. */ + if (!ccwreq_next_path(cdev)) { + rc = -EACCES; + goto err; + } +out_restart: + /* Restart. */ + ccwreq_do(cdev); + return; +err: + ccwreq_stop(cdev, rc); +} + + +/** + * ccw_request_timeout - timeout handler for I/O request procedure + * @cdev: ccw device + * + * Handle timeout during I/O request procedure. + */ +void ccw_request_timeout(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + int rc = -ENODEV, chp; + + if (cio_update_schib(sch)) + goto err; + + for (chp = 0; chp < 8; chp++) { + if ((0x80 >> chp) & sch->schib.pmcw.lpum) + pr_warn("%s: No interrupt was received within %lus (CS=%02x, DS=%02x, CHPID=%x.%02x)\n", + dev_name(&cdev->dev), req->timeout / HZ, + scsw_cstat(&sch->schib.scsw), + scsw_dstat(&sch->schib.scsw), + sch->schid.cssid, + sch->schib.pmcw.chpid[chp]); + } + + if (!ccwreq_next_path(cdev)) { + /* set the final return code for this request */ + req->drc = -ETIME; + } + rc = cio_clear(sch); + if (rc) + goto err; + return; + +err: + ccwreq_stop(cdev, rc); +} + +/** + * ccw_request_notoper - notoper handler for I/O request procedure + * @cdev: ccw device + * + * Handle notoper during I/O request procedure. + */ +void ccw_request_notoper(struct ccw_device *cdev) +{ + ccwreq_stop(cdev, -ENODEV); +} diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c new file mode 100644 index 000000000..1fd982b4d --- /dev/null +++ b/drivers/s390/cio/chp.c @@ -0,0 +1,834 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 1999, 2010 + * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) + * Arnd Bergmann (arndb@de.ibm.com) + * Peter Oberparleiter + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "cio.h" +#include "css.h" +#include "ioasm.h" +#include "cio_debug.h" +#include "chp.h" + +#define to_channelpath(device) container_of(device, struct channel_path, dev) +#define CHP_INFO_UPDATE_INTERVAL 1*HZ + +enum cfg_task_t { + cfg_none, + cfg_configure, + cfg_deconfigure +}; + +/* Map for pending configure tasks. */ +static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1]; +static DEFINE_SPINLOCK(cfg_lock); + +/* Map for channel-path status. */ +static struct sclp_chp_info chp_info; +static DEFINE_MUTEX(info_lock); + +/* Time after which channel-path status may be outdated. */ +static unsigned long chp_info_expires; + +static struct work_struct cfg_work; + +/* Wait queue for configure completion events. */ +static wait_queue_head_t cfg_wait_queue; + +/* Set vary state for given chpid. */ +static void set_chp_logically_online(struct chp_id chpid, int onoff) +{ + chpid_to_chp(chpid)->state = onoff; +} + +/* On success return 0 if channel-path is varied offline, 1 if it is varied + * online. Return -ENODEV if channel-path is not registered. */ +int chp_get_status(struct chp_id chpid) +{ + return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); +} + +/** + * chp_get_sch_opm - return opm for subchannel + * @sch: subchannel + * + * Calculate and return the operational path mask (opm) based on the chpids + * used by the subchannel and the status of the associated channel-paths. + */ +u8 chp_get_sch_opm(struct subchannel *sch) +{ + struct chp_id chpid; + int opm; + int i; + + opm = 0; + chp_id_init(&chpid); + for (i = 0; i < 8; i++) { + opm <<= 1; + chpid.id = sch->schib.pmcw.chpid[i]; + if (chp_get_status(chpid) != 0) + opm |= 1; + } + return opm; +} +EXPORT_SYMBOL_GPL(chp_get_sch_opm); + +/** + * chp_is_registered - check if a channel-path is registered + * @chpid: channel-path ID + * + * Return non-zero if a channel-path with the given chpid is registered, + * zero otherwise. + */ +int chp_is_registered(struct chp_id chpid) +{ + return chpid_to_chp(chpid) != NULL; +} + +/* + * Function: s390_vary_chpid + * Varies the specified chpid online or offline + */ +static int s390_vary_chpid(struct chp_id chpid, int on) +{ + char dbf_text[15]; + int status; + + sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, + chpid.id); + CIO_TRACE_EVENT(2, dbf_text); + + status = chp_get_status(chpid); + if (!on && !status) + return 0; + + set_chp_logically_online(chpid, on); + chsc_chp_vary(chpid, on); + return 0; +} + +/* + * Channel measurement related functions + */ +static ssize_t chp_measurement_chars_read(struct file *filp, + struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + struct channel_path *chp; + struct device *device; + + device = container_of(kobj, struct device, kobj); + chp = to_channelpath(device); + if (chp->cmg == -1) + return 0; + + return memory_read_from_buffer(buf, count, &off, &chp->cmg_chars, + sizeof(chp->cmg_chars)); +} + +static const struct bin_attribute chp_measurement_chars_attr = { + .attr = { + .name = "measurement_chars", + .mode = S_IRUSR, + }, + .size = sizeof(struct cmg_chars), + .read = chp_measurement_chars_read, +}; + +static void chp_measurement_copy_block(struct cmg_entry *buf, + struct channel_subsystem *css, + struct chp_id chpid) +{ + void *area; + struct cmg_entry *entry, reference_buf; + int idx; + + if (chpid.id < 128) { + area = css->cub_addr1; + idx = chpid.id; + } else { + area = css->cub_addr2; + idx = chpid.id - 128; + } + entry = area + (idx * sizeof(struct cmg_entry)); + do { + memcpy(buf, entry, sizeof(*entry)); + memcpy(&reference_buf, entry, sizeof(*entry)); + } while (reference_buf.values[0] != buf->values[0]); +} + +static ssize_t chp_measurement_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + struct channel_path *chp; + struct channel_subsystem *css; + struct device *device; + unsigned int size; + + device = container_of(kobj, struct device, kobj); + chp = to_channelpath(device); + css = to_css(chp->dev.parent); + + size = sizeof(struct cmg_entry); + + /* Only allow single reads. */ + if (off || count < size) + return 0; + chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); + count = size; + return count; +} + +static const struct bin_attribute chp_measurement_attr = { + .attr = { + .name = "measurement", + .mode = S_IRUSR, + }, + .size = sizeof(struct cmg_entry), + .read = chp_measurement_read, +}; + +void chp_remove_cmg_attr(struct channel_path *chp) +{ + device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); + device_remove_bin_file(&chp->dev, &chp_measurement_attr); +} + +int chp_add_cmg_attr(struct channel_path *chp) +{ + int ret; + + ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); + if (ret) + return ret; + ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); + if (ret) + device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); + return ret; +} + +/* + * Files for the channel path entries. + */ +static ssize_t chp_status_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + int status; + + mutex_lock(&chp->lock); + status = chp->state; + mutex_unlock(&chp->lock); + + return status ? sprintf(buf, "online\n") : sprintf(buf, "offline\n"); +} + +static ssize_t chp_status_write(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct channel_path *cp = to_channelpath(dev); + char cmd[10]; + int num_args; + int error; + + num_args = sscanf(buf, "%5s", cmd); + if (!num_args) + return count; + + /* Wait until previous actions have settled. */ + css_wait_for_slow_path(); + + if (!strncasecmp(cmd, "on", 2) || !strcmp(cmd, "1")) { + mutex_lock(&cp->lock); + error = s390_vary_chpid(cp->chpid, 1); + mutex_unlock(&cp->lock); + } else if (!strncasecmp(cmd, "off", 3) || !strcmp(cmd, "0")) { + mutex_lock(&cp->lock); + error = s390_vary_chpid(cp->chpid, 0); + mutex_unlock(&cp->lock); + } else + error = -EINVAL; + + return error < 0 ? error : count; +} + +static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); + +static ssize_t chp_configure_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct channel_path *cp; + int status; + + cp = to_channelpath(dev); + status = chp_info_get_status(cp->chpid); + if (status < 0) + return status; + + return snprintf(buf, PAGE_SIZE, "%d\n", status); +} + +static int cfg_wait_idle(void); + +static ssize_t chp_configure_write(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct channel_path *cp; + int val; + char delim; + + if (sscanf(buf, "%d %c", &val, &delim) != 1) + return -EINVAL; + if (val != 0 && val != 1) + return -EINVAL; + cp = to_channelpath(dev); + chp_cfg_schedule(cp->chpid, val); + cfg_wait_idle(); + + return count; +} + +static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); + +static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + u8 type; + + mutex_lock(&chp->lock); + type = chp->desc.desc; + mutex_unlock(&chp->lock); + return sprintf(buf, "%x\n", type); +} + +static DEVICE_ATTR(type, 0444, chp_type_show, NULL); + +static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + + if (!chp) + return 0; + if (chp->cmg == -1) /* channel measurements not available */ + return sprintf(buf, "unknown\n"); + return sprintf(buf, "%x\n", chp->cmg); +} + +static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); + +static ssize_t chp_shared_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + + if (!chp) + return 0; + if (chp->shared == -1) /* channel measurements not available */ + return sprintf(buf, "unknown\n"); + return sprintf(buf, "%x\n", chp->shared); +} + +static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); + +static ssize_t chp_chid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + ssize_t rc; + + mutex_lock(&chp->lock); + if (chp->desc_fmt1.flags & 0x10) + rc = sprintf(buf, "%04x\n", chp->desc_fmt1.chid); + else + rc = 0; + mutex_unlock(&chp->lock); + + return rc; +} +static DEVICE_ATTR(chid, 0444, chp_chid_show, NULL); + +static ssize_t chp_chid_external_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + ssize_t rc; + + mutex_lock(&chp->lock); + if (chp->desc_fmt1.flags & 0x10) + rc = sprintf(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0); + else + rc = 0; + mutex_unlock(&chp->lock); + + return rc; +} +static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL); + +static ssize_t util_string_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *attr, char *buf, + loff_t off, size_t count) +{ + struct channel_path *chp = to_channelpath(kobj_to_dev(kobj)); + ssize_t rc; + + mutex_lock(&chp->lock); + rc = memory_read_from_buffer(buf, count, &off, chp->desc_fmt3.util_str, + sizeof(chp->desc_fmt3.util_str)); + mutex_unlock(&chp->lock); + + return rc; +} +static BIN_ATTR_RO(util_string, + sizeof(((struct channel_path_desc_fmt3 *)0)->util_str)); + +static struct bin_attribute *chp_bin_attrs[] = { + &bin_attr_util_string, + NULL, +}; + +static struct attribute *chp_attrs[] = { + &dev_attr_status.attr, + &dev_attr_configure.attr, + &dev_attr_type.attr, + &dev_attr_cmg.attr, + &dev_attr_shared.attr, + &dev_attr_chid.attr, + &dev_attr_chid_external.attr, + NULL, +}; +static struct attribute_group chp_attr_group = { + .attrs = chp_attrs, + .bin_attrs = chp_bin_attrs, +}; +static const struct attribute_group *chp_attr_groups[] = { + &chp_attr_group, + NULL, +}; + +static void chp_release(struct device *dev) +{ + struct channel_path *cp; + + cp = to_channelpath(dev); + kfree(cp); +} + +/** + * chp_update_desc - update channel-path description + * @chp: channel-path + * + * Update the channel-path description of the specified channel-path + * including channel measurement related information. + * Return zero on success, non-zero otherwise. + */ +int chp_update_desc(struct channel_path *chp) +{ + int rc; + + rc = chsc_determine_fmt0_channel_path_desc(chp->chpid, &chp->desc); + if (rc) + return rc; + + /* + * Fetching the following data is optional. Not all machines or + * hypervisors implement the required chsc commands. + */ + chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1); + chsc_determine_fmt3_channel_path_desc(chp->chpid, &chp->desc_fmt3); + chsc_get_channel_measurement_chars(chp); + + return 0; +} + +/** + * chp_new - register a new channel-path + * @chpid: channel-path ID + * + * Create and register data structure representing new channel-path. Return + * zero on success, non-zero otherwise. + */ +int chp_new(struct chp_id chpid) +{ + struct channel_subsystem *css = css_by_id(chpid.cssid); + struct channel_path *chp; + int ret = 0; + + mutex_lock(&css->mutex); + if (chp_is_registered(chpid)) + goto out; + + chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); + if (!chp) { + ret = -ENOMEM; + goto out; + } + /* fill in status, etc. */ + chp->chpid = chpid; + chp->state = 1; + chp->dev.parent = &css->device; + chp->dev.groups = chp_attr_groups; + chp->dev.release = chp_release; + mutex_init(&chp->lock); + + /* Obtain channel path description and fill it in. */ + ret = chp_update_desc(chp); + if (ret) + goto out_free; + if ((chp->desc.flags & 0x80) == 0) { + ret = -ENODEV; + goto out_free; + } + dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); + + /* make it known to the system */ + ret = device_register(&chp->dev); + if (ret) { + CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", + chpid.cssid, chpid.id, ret); + put_device(&chp->dev); + goto out; + } + + if (css->cm_enabled) { + ret = chp_add_cmg_attr(chp); + if (ret) { + device_unregister(&chp->dev); + goto out; + } + } + css->chps[chpid.id] = chp; + goto out; +out_free: + kfree(chp); +out: + mutex_unlock(&css->mutex); + return ret; +} + +/** + * chp_get_chp_desc - return newly allocated channel-path description + * @chpid: channel-path ID + * + * On success return a newly allocated copy of the channel-path description + * data associated with the given channel-path ID. Return %NULL on error. + */ +struct channel_path_desc_fmt0 *chp_get_chp_desc(struct chp_id chpid) +{ + struct channel_path *chp; + struct channel_path_desc_fmt0 *desc; + + chp = chpid_to_chp(chpid); + if (!chp) + return NULL; + desc = kmalloc(sizeof(*desc), GFP_KERNEL); + if (!desc) + return NULL; + + mutex_lock(&chp->lock); + memcpy(desc, &chp->desc, sizeof(*desc)); + mutex_unlock(&chp->lock); + return desc; +} + +/** + * chp_process_crw - process channel-path status change + * @crw0: channel report-word to handler + * @crw1: second channel-report word (always NULL) + * @overflow: crw overflow indication + * + * Handle channel-report-words indicating that the status of a channel-path + * has changed. + */ +static void chp_process_crw(struct crw *crw0, struct crw *crw1, + int overflow) +{ + struct chp_id chpid; + + if (overflow) { + css_schedule_eval_all(); + return; + } + CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " + "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", + crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, + crw0->erc, crw0->rsid); + /* + * Check for solicited machine checks. These are + * created by reset channel path and need not be + * handled here. + */ + if (crw0->slct) { + CIO_CRW_EVENT(2, "solicited machine check for " + "channel path %02X\n", crw0->rsid); + return; + } + chp_id_init(&chpid); + chpid.id = crw0->rsid; + switch (crw0->erc) { + case CRW_ERC_IPARM: /* Path has come. */ + case CRW_ERC_INIT: + chp_new(chpid); + chsc_chp_online(chpid); + break; + case CRW_ERC_PERRI: /* Path has gone. */ + case CRW_ERC_PERRN: + chsc_chp_offline(chpid); + break; + default: + CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", + crw0->erc); + } +} + +int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) +{ + int i; + int mask; + + for (i = 0; i < 8; i++) { + mask = 0x80 >> i; + if (!(ssd->path_mask & mask)) + continue; + if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) + continue; + if ((ssd->fla_valid_mask & mask) && + ((ssd->fla[i] & link->fla_mask) != link->fla)) + continue; + return mask; + } + return 0; +} +EXPORT_SYMBOL_GPL(chp_ssd_get_mask); + +static inline int info_bit_num(struct chp_id id) +{ + return id.id + id.cssid * (__MAX_CHPID + 1); +} + +/* Force chp_info refresh on next call to info_validate(). */ +static void info_expire(void) +{ + mutex_lock(&info_lock); + chp_info_expires = jiffies - 1; + mutex_unlock(&info_lock); +} + +/* Ensure that chp_info is up-to-date. */ +static int info_update(void) +{ + int rc; + + mutex_lock(&info_lock); + rc = 0; + if (time_after(jiffies, chp_info_expires)) { + /* Data is too old, update. */ + rc = sclp_chp_read_info(&chp_info); + chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; + } + mutex_unlock(&info_lock); + + return rc; +} + +/** + * chp_info_get_status - retrieve configure status of a channel-path + * @chpid: channel-path ID + * + * On success, return 0 for standby, 1 for configured, 2 for reserved, + * 3 for not recognized. Return negative error code on error. + */ +int chp_info_get_status(struct chp_id chpid) +{ + int rc; + int bit; + + rc = info_update(); + if (rc) + return rc; + + bit = info_bit_num(chpid); + mutex_lock(&info_lock); + if (!chp_test_bit(chp_info.recognized, bit)) + rc = CHP_STATUS_NOT_RECOGNIZED; + else if (chp_test_bit(chp_info.configured, bit)) + rc = CHP_STATUS_CONFIGURED; + else if (chp_test_bit(chp_info.standby, bit)) + rc = CHP_STATUS_STANDBY; + else + rc = CHP_STATUS_RESERVED; + mutex_unlock(&info_lock); + + return rc; +} + +/* Return configure task for chpid. */ +static enum cfg_task_t cfg_get_task(struct chp_id chpid) +{ + return chp_cfg_task[chpid.cssid][chpid.id]; +} + +/* Set configure task for chpid. */ +static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) +{ + chp_cfg_task[chpid.cssid][chpid.id] = cfg; +} + +/* Fetch the first configure task. Set chpid accordingly. */ +static enum cfg_task_t chp_cfg_fetch_task(struct chp_id *chpid) +{ + enum cfg_task_t t = cfg_none; + + chp_id_for_each(chpid) { + t = cfg_get_task(*chpid); + if (t != cfg_none) + break; + } + + return t; +} + +/* Perform one configure/deconfigure request. Reschedule work function until + * last request. */ +static void cfg_func(struct work_struct *work) +{ + struct chp_id chpid; + enum cfg_task_t t; + int rc; + + spin_lock(&cfg_lock); + t = chp_cfg_fetch_task(&chpid); + spin_unlock(&cfg_lock); + + switch (t) { + case cfg_configure: + rc = sclp_chp_configure(chpid); + if (rc) + CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" + "%d\n", chpid.cssid, chpid.id, rc); + else { + info_expire(); + chsc_chp_online(chpid); + } + break; + case cfg_deconfigure: + rc = sclp_chp_deconfigure(chpid); + if (rc) + CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" + "%d\n", chpid.cssid, chpid.id, rc); + else { + info_expire(); + chsc_chp_offline(chpid); + } + break; + case cfg_none: + /* Get updated information after last change. */ + info_update(); + wake_up_interruptible(&cfg_wait_queue); + return; + } + spin_lock(&cfg_lock); + if (t == cfg_get_task(chpid)) + cfg_set_task(chpid, cfg_none); + spin_unlock(&cfg_lock); + schedule_work(&cfg_work); +} + +/** + * chp_cfg_schedule - schedule chpid configuration request + * @chpid: channel-path ID + * @configure: Non-zero for configure, zero for deconfigure + * + * Schedule a channel-path configuration/deconfiguration request. + */ +void chp_cfg_schedule(struct chp_id chpid, int configure) +{ + CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, + configure); + spin_lock(&cfg_lock); + cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); + spin_unlock(&cfg_lock); + schedule_work(&cfg_work); +} + +/** + * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request + * @chpid: channel-path ID + * + * Cancel an active channel-path deconfiguration request if it has not yet + * been performed. + */ +void chp_cfg_cancel_deconfigure(struct chp_id chpid) +{ + CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); + spin_lock(&cfg_lock); + if (cfg_get_task(chpid) == cfg_deconfigure) + cfg_set_task(chpid, cfg_none); + spin_unlock(&cfg_lock); +} + +static bool cfg_idle(void) +{ + struct chp_id chpid; + enum cfg_task_t t; + + spin_lock(&cfg_lock); + t = chp_cfg_fetch_task(&chpid); + spin_unlock(&cfg_lock); + + return t == cfg_none; +} + +static int cfg_wait_idle(void) +{ + if (wait_event_interruptible(cfg_wait_queue, cfg_idle())) + return -ERESTARTSYS; + return 0; +} + +static int __init chp_init(void) +{ + struct chp_id chpid; + int state, ret; + + ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); + if (ret) + return ret; + INIT_WORK(&cfg_work, cfg_func); + init_waitqueue_head(&cfg_wait_queue); + if (info_update()) + return 0; + /* Register available channel-paths. */ + chp_id_for_each(&chpid) { + state = chp_info_get_status(chpid); + if (state == CHP_STATUS_CONFIGURED || + state == CHP_STATUS_STANDBY) + chp_new(chpid); + } + + return 0; +} + +subsys_initcall(chp_init); diff --git a/drivers/s390/cio/chp.h b/drivers/s390/cio/chp.h new file mode 100644 index 000000000..20259f3fb --- /dev/null +++ b/drivers/s390/cio/chp.h @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2007, 2010 + * Author(s): Peter Oberparleiter + */ + +#ifndef S390_CHP_H +#define S390_CHP_H + +#include +#include +#include +#include +#include "chsc.h" +#include "css.h" + +#define CHP_STATUS_STANDBY 0 +#define CHP_STATUS_CONFIGURED 1 +#define CHP_STATUS_RESERVED 2 +#define CHP_STATUS_NOT_RECOGNIZED 3 + +#define CHP_ONLINE 0 +#define CHP_OFFLINE 1 +#define CHP_VARY_ON 2 +#define CHP_VARY_OFF 3 + +struct chp_link { + struct chp_id chpid; + u32 fla_mask; + u16 fla; +}; + +static inline int chp_test_bit(u8 *bitmap, int num) +{ + int byte = num >> 3; + int mask = 128 >> (num & 7); + + return (bitmap[byte] & mask) ? 1 : 0; +} + + +struct channel_path { + struct device dev; + struct chp_id chpid; + struct mutex lock; /* Serialize access to below members. */ + int state; + struct channel_path_desc_fmt0 desc; + struct channel_path_desc_fmt1 desc_fmt1; + struct channel_path_desc_fmt3 desc_fmt3; + /* Channel-measurement related stuff: */ + int cmg; + int shared; + struct cmg_chars cmg_chars; +}; + +/* Return channel_path struct for given chpid. */ +static inline struct channel_path *chpid_to_chp(struct chp_id chpid) +{ + return css_by_id(chpid.cssid)->chps[chpid.id]; +} + +int chp_get_status(struct chp_id chpid); +u8 chp_get_sch_opm(struct subchannel *sch); +int chp_is_registered(struct chp_id chpid); +struct channel_path_desc_fmt0 *chp_get_chp_desc(struct chp_id chpid); +void chp_remove_cmg_attr(struct channel_path *chp); +int chp_add_cmg_attr(struct channel_path *chp); +int chp_update_desc(struct channel_path *chp); +int chp_new(struct chp_id chpid); +void chp_cfg_schedule(struct chp_id chpid, int configure); +void chp_cfg_cancel_deconfigure(struct chp_id chpid); +int chp_info_get_status(struct chp_id chpid); +int chp_ssd_get_mask(struct chsc_ssd_info *, struct chp_link *); +#endif /* S390_CHP_H */ diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c new file mode 100644 index 000000000..3f03163c7 --- /dev/null +++ b/drivers/s390/cio/chsc.c @@ -0,0 +1,1382 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * S/390 common I/O routines -- channel subsystem call + * + * Copyright IBM Corp. 1999,2012 + * Author(s): Ingo Adlung (adlung@de.ibm.com) + * Cornelia Huck (cornelia.huck@de.ibm.com) + * Arnd Bergmann (arndb@de.ibm.com) + */ + +#define KMSG_COMPONENT "cio" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include "css.h" +#include "cio.h" +#include "cio_debug.h" +#include "ioasm.h" +#include "chp.h" +#include "chsc.h" + +static void *sei_page; +static void *chsc_page; +static DEFINE_SPINLOCK(chsc_page_lock); + +/** + * chsc_error_from_response() - convert a chsc response to an error + * @response: chsc response code + * + * Returns an appropriate Linux error code for @response. + */ +int chsc_error_from_response(int response) +{ + switch (response) { + case 0x0001: + return 0; + case 0x0002: + case 0x0003: + case 0x0006: + case 0x0007: + case 0x0008: + case 0x000a: + case 0x0104: + return -EINVAL; + case 0x0004: + return -EOPNOTSUPP; + case 0x000b: + case 0x0107: /* "Channel busy" for the op 0x003d */ + return -EBUSY; + case 0x0100: + case 0x0102: + return -ENOMEM; + default: + return -EIO; + } +} +EXPORT_SYMBOL_GPL(chsc_error_from_response); + +struct chsc_ssd_area { + struct chsc_header request; + u16 :10; + u16 ssid:2; + u16 :4; + u16 f_sch; /* first subchannel */ + u16 :16; + u16 l_sch; /* last subchannel */ + u32 :32; + struct chsc_header response; + u32 :32; + u8 sch_valid : 1; + u8 dev_valid : 1; + u8 st : 3; /* subchannel type */ + u8 zeroes : 3; + u8 unit_addr; /* unit address */ + u16 devno; /* device number */ + u8 path_mask; + u8 fla_valid_mask; + u16 sch; /* subchannel */ + u8 chpid[8]; /* chpids 0-7 */ + u16 fla[8]; /* full link addresses 0-7 */ +} __packed __aligned(PAGE_SIZE); + +int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd) +{ + struct chsc_ssd_area *ssd_area; + unsigned long flags; + int ccode; + int ret; + int i; + int mask; + + spin_lock_irqsave(&chsc_page_lock, flags); + memset(chsc_page, 0, PAGE_SIZE); + ssd_area = chsc_page; + ssd_area->request.length = 0x0010; + ssd_area->request.code = 0x0004; + ssd_area->ssid = schid.ssid; + ssd_area->f_sch = schid.sch_no; + ssd_area->l_sch = schid.sch_no; + + ccode = chsc(ssd_area); + /* Check response. */ + if (ccode > 0) { + ret = (ccode == 3) ? -ENODEV : -EBUSY; + goto out; + } + ret = chsc_error_from_response(ssd_area->response.code); + if (ret != 0) { + CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n", + schid.ssid, schid.sch_no, + ssd_area->response.code); + goto out; + } + if (!ssd_area->sch_valid) { + ret = -ENODEV; + goto out; + } + /* Copy data */ + ret = 0; + memset(ssd, 0, sizeof(struct chsc_ssd_info)); + if ((ssd_area->st != SUBCHANNEL_TYPE_IO) && + (ssd_area->st != SUBCHANNEL_TYPE_MSG)) + goto out; + ssd->path_mask = ssd_area->path_mask; + ssd->fla_valid_mask = ssd_area->fla_valid_mask; + for (i = 0; i < 8; i++) { + mask = 0x80 >> i; + if (ssd_area->path_mask & mask) { + chp_id_init(&ssd->chpid[i]); + ssd->chpid[i].id = ssd_area->chpid[i]; + } + if (ssd_area->fla_valid_mask & mask) + ssd->fla[i] = ssd_area->fla[i]; + } +out: + spin_unlock_irqrestore(&chsc_page_lock, flags); + return ret; +} + +/** + * chsc_ssqd() - store subchannel QDIO data (SSQD) + * @schid: id of the subchannel on which SSQD is performed + * @ssqd: request and response block for SSQD + * + * Returns 0 on success. + */ +int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd) +{ + memset(ssqd, 0, sizeof(*ssqd)); + ssqd->request.length = 0x0010; + ssqd->request.code = 0x0024; + ssqd->first_sch = schid.sch_no; + ssqd->last_sch = schid.sch_no; + ssqd->ssid = schid.ssid; + + if (chsc(ssqd)) + return -EIO; + + return chsc_error_from_response(ssqd->response.code); +} +EXPORT_SYMBOL_GPL(chsc_ssqd); + +/** + * chsc_sadc() - set adapter device controls (SADC) + * @schid: id of the subchannel on which SADC is performed + * @scssc: request and response block for SADC + * @summary_indicator_addr: summary indicator address + * @subchannel_indicator_addr: subchannel indicator address + * + * Returns 0 on success. + */ +int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc, + u64 summary_indicator_addr, u64 subchannel_indicator_addr) +{ + memset(scssc, 0, sizeof(*scssc)); + scssc->request.length = 0x0fe0; + scssc->request.code = 0x0021; + scssc->operation_code = 0; + + scssc->summary_indicator_addr = summary_indicator_addr; + scssc->subchannel_indicator_addr = subchannel_indicator_addr; + + scssc->ks = PAGE_DEFAULT_KEY >> 4; + scssc->kc = PAGE_DEFAULT_KEY >> 4; + scssc->isc = QDIO_AIRQ_ISC; + scssc->schid = schid; + + /* enable the time delay disablement facility */ + if (css_general_characteristics.aif_tdd) + scssc->word_with_d_bit = 0x10000000; + + if (chsc(scssc)) + return -EIO; + + return chsc_error_from_response(scssc->response.code); +} +EXPORT_SYMBOL_GPL(chsc_sadc); + +static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data) +{ + spin_lock_irq(sch->lock); + if (sch->driver && sch->driver->chp_event) + if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0) + goto out_unreg; + spin_unlock_irq(sch->lock); + return 0; + +out_unreg: + sch->lpm = 0; + spin_unlock_irq(sch->lock); + css_schedule_eval(sch->schid); + return 0; +} + +void chsc_chp_offline(struct chp_id chpid) +{ + struct channel_path *chp = chpid_to_chp(chpid); + struct chp_link link; + char dbf_txt[15]; + + sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id); + CIO_TRACE_EVENT(2, dbf_txt); + + if (chp_get_status(chpid) <= 0) + return; + memset(&link, 0, sizeof(struct chp_link)); + link.chpid = chpid; + /* Wait until previous actions have settled. */ + css_wait_for_slow_path(); + + mutex_lock(&chp->lock); + chp_update_desc(chp); + mutex_unlock(&chp->lock); + + for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link); +} + +static int __s390_process_res_acc(struct subchannel *sch, void *data) +{ + spin_lock_irq(sch->lock); + if (sch->driver && sch->driver->chp_event) + sch->driver->chp_event(sch, data, CHP_ONLINE); + spin_unlock_irq(sch->lock); + + return 0; +} + +static void s390_process_res_acc(struct chp_link *link) +{ + char dbf_txt[15]; + + sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid, + link->chpid.id); + CIO_TRACE_EVENT( 2, dbf_txt); + if (link->fla != 0) { + sprintf(dbf_txt, "fla%x", link->fla); + CIO_TRACE_EVENT( 2, dbf_txt); + } + /* Wait until previous actions have settled. */ + css_wait_for_slow_path(); + /* + * I/O resources may have become accessible. + * Scan through all subchannels that may be concerned and + * do a validation on those. + * The more information we have (info), the less scanning + * will we have to do. + */ + for_each_subchannel_staged(__s390_process_res_acc, NULL, link); + css_schedule_reprobe(); +} + +struct chsc_sei_nt0_area { + u8 flags; + u8 vf; /* validity flags */ + u8 rs; /* reporting source */ + u8 cc; /* content code */ + u16 fla; /* full link address */ + u16 rsid; /* reporting source id */ + u32 reserved1; + u32 reserved2; + /* ccdf has to be big enough for a link-incident record */ + u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */ +} __packed; + +struct chsc_sei_nt2_area { + u8 flags; /* p and v bit */ + u8 reserved1; + u8 reserved2; + u8 cc; /* content code */ + u32 reserved3[13]; + u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */ +} __packed; + +#define CHSC_SEI_NT0 (1ULL << 63) +#define CHSC_SEI_NT2 (1ULL << 61) + +struct chsc_sei { + struct chsc_header request; + u32 reserved1; + u64 ntsm; /* notification type mask */ + struct chsc_header response; + u32 :24; + u8 nt; + union { + struct chsc_sei_nt0_area nt0_area; + struct chsc_sei_nt2_area nt2_area; + u8 nt_area[PAGE_SIZE - 24]; + } u; +} __packed __aligned(PAGE_SIZE); + +/* + * Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands" + */ + +#define ND_VALIDITY_VALID 0 +#define ND_VALIDITY_OUTDATED 1 +#define ND_VALIDITY_INVALID 2 + +struct node_descriptor { + /* Flags. */ + union { + struct { + u32 validity:3; + u32 reserved:5; + } __packed; + u8 byte0; + } __packed; + + /* Node parameters. */ + u32 params:24; + + /* Node ID. */ + char type[6]; + char model[3]; + char manufacturer[3]; + char plant[2]; + char seq[12]; + u16 tag; +} __packed; + +/* + * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface" + */ + +#define LIR_IQ_CLASS_INFO 0 +#define LIR_IQ_CLASS_DEGRADED 1 +#define LIR_IQ_CLASS_NOT_OPERATIONAL 2 + +struct lir { + struct { + u32 null:1; + u32 reserved:3; + u32 class:2; + u32 reserved2:2; + } __packed iq; + u32 ic:8; + u32 reserved:16; + struct node_descriptor incident_node; + struct node_descriptor attached_node; + u8 reserved2[32]; +} __packed; + +#define PARAMS_LEN 10 /* PARAMS=xx,xxxxxx */ +#define NODEID_LEN 35 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */ + +/* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */ +static char *store_ebcdic(char *dest, const char *src, unsigned long len, + char delim) +{ + memcpy(dest, src, len); + EBCASC(dest, len); + + if (delim) + dest[len++] = delim; + + return dest + len; +} + +/* Format node ID and parameters for output in LIR log message. */ +static void format_node_data(char *params, char *id, struct node_descriptor *nd) +{ + memset(params, 0, PARAMS_LEN); + memset(id, 0, NODEID_LEN); + + if (nd->validity != ND_VALIDITY_VALID) { + strncpy(params, "n/a", PARAMS_LEN - 1); + strncpy(id, "n/a", NODEID_LEN - 1); + return; + } + + /* PARAMS=xx,xxxxxx */ + snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params); + /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */ + id = store_ebcdic(id, nd->type, sizeof(nd->type), '/'); + id = store_ebcdic(id, nd->model, sizeof(nd->model), ','); + id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.'); + id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0); + id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ','); + sprintf(id, "%04X", nd->tag); +} + +static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area) +{ + struct lir *lir = (struct lir *) &sei_area->ccdf; + char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN], + aunodeid[NODEID_LEN]; + + CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n", + sei_area->rs, sei_area->rsid, sei_area->ccdf[0]); + + /* Ignore NULL Link Incident Records. */ + if (lir->iq.null) + return; + + /* Inform user that a link requires maintenance actions because it has + * become degraded or not operational. Note that this log message is + * the primary intention behind a Link Incident Record. */ + + format_node_data(iuparams, iunodeid, &lir->incident_node); + format_node_data(auparams, aunodeid, &lir->attached_node); + + switch (lir->iq.class) { + case LIR_IQ_CLASS_DEGRADED: + pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x " + "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n", + sei_area->rs, sei_area->rsid, lir->ic, iuparams, + iunodeid, auparams, aunodeid); + break; + case LIR_IQ_CLASS_NOT_OPERATIONAL: + pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x " + "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n", + sei_area->rs, sei_area->rsid, lir->ic, iuparams, + iunodeid, auparams, aunodeid); + break; + default: + break; + } +} + +static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area) +{ + struct channel_path *chp; + struct chp_link link; + struct chp_id chpid; + int status; + + CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, " + "rs_id=%04x)\n", sei_area->rs, sei_area->rsid); + if (sei_area->rs != 4) + return; + chp_id_init(&chpid); + chpid.id = sei_area->rsid; + /* allocate a new channel path structure, if needed */ + status = chp_get_status(chpid); + if (!status) + return; + + if (status < 0) { + chp_new(chpid); + } else { + chp = chpid_to_chp(chpid); + mutex_lock(&chp->lock); + chp_update_desc(chp); + mutex_unlock(&chp->lock); + } + memset(&link, 0, sizeof(struct chp_link)); + link.chpid = chpid; + if ((sei_area->vf & 0xc0) != 0) { + link.fla = sei_area->fla; + if ((sei_area->vf & 0xc0) == 0xc0) + /* full link address */ + link.fla_mask = 0xffff; + else + /* link address */ + link.fla_mask = 0xff00; + } + s390_process_res_acc(&link); +} + +static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area) +{ + struct channel_path *chp; + struct chp_id chpid; + u8 *data; + int num; + + CIO_CRW_EVENT(4, "chsc: channel path availability information\n"); + if (sei_area->rs != 0) + return; + data = sei_area->ccdf; + chp_id_init(&chpid); + for (num = 0; num <= __MAX_CHPID; num++) { + if (!chp_test_bit(data, num)) + continue; + chpid.id = num; + + CIO_CRW_EVENT(4, "Update information for channel path " + "%x.%02x\n", chpid.cssid, chpid.id); + chp = chpid_to_chp(chpid); + if (!chp) { + chp_new(chpid); + continue; + } + mutex_lock(&chp->lock); + chp_update_desc(chp); + mutex_unlock(&chp->lock); + } +} + +struct chp_config_data { + u8 map[32]; + u8 op; + u8 pc; +}; + +static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area) +{ + struct chp_config_data *data; + struct chp_id chpid; + int num; + char *events[3] = {"configure", "deconfigure", "cancel deconfigure"}; + + CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n"); + if (sei_area->rs != 0) + return; + data = (struct chp_config_data *) &(sei_area->ccdf); + chp_id_init(&chpid); + for (num = 0; num <= __MAX_CHPID; num++) { + if (!chp_test_bit(data->map, num)) + continue; + chpid.id = num; + pr_notice("Processing %s for channel path %x.%02x\n", + events[data->op], chpid.cssid, chpid.id); + switch (data->op) { + case 0: + chp_cfg_schedule(chpid, 1); + break; + case 1: + chp_cfg_schedule(chpid, 0); + break; + case 2: + chp_cfg_cancel_deconfigure(chpid); + break; + } + } +} + +static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area) +{ + int ret; + + CIO_CRW_EVENT(4, "chsc: scm change notification\n"); + if (sei_area->rs != 7) + return; + + ret = scm_update_information(); + if (ret) + CIO_CRW_EVENT(0, "chsc: updating change notification" + " failed (rc=%d).\n", ret); +} + +static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area) +{ + int ret; + + CIO_CRW_EVENT(4, "chsc: scm available information\n"); + if (sei_area->rs != 7) + return; + + ret = scm_process_availability_information(); + if (ret) + CIO_CRW_EVENT(0, "chsc: process availability information" + " failed (rc=%d).\n", ret); +} + +static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area) +{ + switch (sei_area->cc) { + case 1: + zpci_event_error(sei_area->ccdf); + break; + case 2: + zpci_event_availability(sei_area->ccdf); + break; + default: + CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n", + sei_area->cc); + break; + } +} + +static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area) +{ + /* which kind of information was stored? */ + switch (sei_area->cc) { + case 1: /* link incident*/ + chsc_process_sei_link_incident(sei_area); + break; + case 2: /* i/o resource accessibility */ + chsc_process_sei_res_acc(sei_area); + break; + case 7: /* channel-path-availability information */ + chsc_process_sei_chp_avail(sei_area); + break; + case 8: /* channel-path-configuration notification */ + chsc_process_sei_chp_config(sei_area); + break; + case 12: /* scm change notification */ + chsc_process_sei_scm_change(sei_area); + break; + case 14: /* scm available notification */ + chsc_process_sei_scm_avail(sei_area); + break; + default: /* other stuff */ + CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n", + sei_area->cc); + break; + } + + /* Check if we might have lost some information. */ + if (sei_area->flags & 0x40) { + CIO_CRW_EVENT(2, "chsc: event overflow\n"); + css_schedule_eval_all(); + } +} + +static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm) +{ + static int ntsm_unsupported; + + while (true) { + memset(sei, 0, sizeof(*sei)); + sei->request.length = 0x0010; + sei->request.code = 0x000e; + if (!ntsm_unsupported) + sei->ntsm = ntsm; + + if (chsc(sei)) + break; + + if (sei->response.code != 0x0001) { + CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n", + sei->response.code, sei->ntsm); + + if (sei->response.code == 3 && sei->ntsm) { + /* Fallback for old firmware. */ + ntsm_unsupported = 1; + continue; + } + break; + } + + CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt); + switch (sei->nt) { + case 0: + chsc_process_sei_nt0(&sei->u.nt0_area); + break; + case 2: + chsc_process_sei_nt2(&sei->u.nt2_area); + break; + default: + CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt); + break; + } + + if (!(sei->u.nt0_area.flags & 0x80)) + break; + } +} + +/* + * Handle channel subsystem related CRWs. + * Use store event information to find out what's going on. + * + * Note: Access to sei_page is serialized through machine check handler + * thread, so no need for locking. + */ +static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow) +{ + struct chsc_sei *sei = sei_page; + + if (overflow) { + css_schedule_eval_all(); + return; + } + CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " + "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", + crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, + crw0->erc, crw0->rsid); + + CIO_TRACE_EVENT(2, "prcss"); + chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2); +} + +void chsc_chp_online(struct chp_id chpid) +{ + struct channel_path *chp = chpid_to_chp(chpid); + struct chp_link link; + char dbf_txt[15]; + + sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id); + CIO_TRACE_EVENT(2, dbf_txt); + + if (chp_get_status(chpid) != 0) { + memset(&link, 0, sizeof(struct chp_link)); + link.chpid = chpid; + /* Wait until previous actions have settled. */ + css_wait_for_slow_path(); + + mutex_lock(&chp->lock); + chp_update_desc(chp); + mutex_unlock(&chp->lock); + + for_each_subchannel_staged(__s390_process_res_acc, NULL, + &link); + css_schedule_reprobe(); + } +} + +static void __s390_subchannel_vary_chpid(struct subchannel *sch, + struct chp_id chpid, int on) +{ + unsigned long flags; + struct chp_link link; + + memset(&link, 0, sizeof(struct chp_link)); + link.chpid = chpid; + spin_lock_irqsave(sch->lock, flags); + if (sch->driver && sch->driver->chp_event) + sch->driver->chp_event(sch, &link, + on ? CHP_VARY_ON : CHP_VARY_OFF); + spin_unlock_irqrestore(sch->lock, flags); +} + +static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data) +{ + struct chp_id *chpid = data; + + __s390_subchannel_vary_chpid(sch, *chpid, 0); + return 0; +} + +static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data) +{ + struct chp_id *chpid = data; + + __s390_subchannel_vary_chpid(sch, *chpid, 1); + return 0; +} + +/** + * chsc_chp_vary - propagate channel-path vary operation to subchannels + * @chpid: channl-path ID + * @on: non-zero for vary online, zero for vary offline + */ +int chsc_chp_vary(struct chp_id chpid, int on) +{ + struct channel_path *chp = chpid_to_chp(chpid); + + /* + * Redo PathVerification on the devices the chpid connects to + */ + if (on) { + /* Try to update the channel path description. */ + chp_update_desc(chp); + for_each_subchannel_staged(s390_subchannel_vary_chpid_on, + NULL, &chpid); + css_schedule_reprobe(); + } else + for_each_subchannel_staged(s390_subchannel_vary_chpid_off, + NULL, &chpid); + + return 0; +} + +static void +chsc_remove_cmg_attr(struct channel_subsystem *css) +{ + int i; + + for (i = 0; i <= __MAX_CHPID; i++) { + if (!css->chps[i]) + continue; + chp_remove_cmg_attr(css->chps[i]); + } +} + +static int +chsc_add_cmg_attr(struct channel_subsystem *css) +{ + int i, ret; + + ret = 0; + for (i = 0; i <= __MAX_CHPID; i++) { + if (!css->chps[i]) + continue; + ret = chp_add_cmg_attr(css->chps[i]); + if (ret) + goto cleanup; + } + return ret; +cleanup: + for (--i; i >= 0; i--) { + if (!css->chps[i]) + continue; + chp_remove_cmg_attr(css->chps[i]); + } + return ret; +} + +int __chsc_do_secm(struct channel_subsystem *css, int enable) +{ + struct { + struct chsc_header request; + u32 operation_code : 2; + u32 : 30; + u32 key : 4; + u32 : 28; + u32 zeroes1; + u32 cub_addr1; + u32 zeroes2; + u32 cub_addr2; + u32 reserved[13]; + struct chsc_header response; + u32 status : 8; + u32 : 4; + u32 fmt : 4; + u32 : 16; + } *secm_area; + unsigned long flags; + int ret, ccode; + + spin_lock_irqsave(&chsc_page_lock, flags); + memset(chsc_page, 0, PAGE_SIZE); + secm_area = chsc_page; + secm_area->request.length = 0x0050; + secm_area->request.code = 0x0016; + + secm_area->key = PAGE_DEFAULT_KEY >> 4; + secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1; + secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2; + + secm_area->operation_code = enable ? 0 : 1; + + ccode = chsc(secm_area); + if (ccode > 0) { + ret = (ccode == 3) ? -ENODEV : -EBUSY; + goto out; + } + + switch (secm_area->response.code) { + case 0x0102: + case 0x0103: + ret = -EINVAL; + break; + default: + ret = chsc_error_from_response(secm_area->response.code); + } + if (ret != 0) + CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n", + secm_area->response.code); +out: + spin_unlock_irqrestore(&chsc_page_lock, flags); + return ret; +} + +int +chsc_secm(struct channel_subsystem *css, int enable) +{ + int ret; + + if (enable && !css->cm_enabled) { + css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!css->cub_addr1 || !css->cub_addr2) { + free_page((unsigned long)css->cub_addr1); + free_page((unsigned long)css->cub_addr2); + return -ENOMEM; + } + } + ret = __chsc_do_secm(css, enable); + if (!ret) { + css->cm_enabled = enable; + if (css->cm_enabled) { + ret = chsc_add_cmg_attr(css); + if (ret) { + __chsc_do_secm(css, 0); + css->cm_enabled = 0; + } + } else + chsc_remove_cmg_attr(css); + } + if (!css->cm_enabled) { + free_page((unsigned long)css->cub_addr1); + free_page((unsigned long)css->cub_addr2); + } + return ret; +} + +int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt, + int c, int m, void *page) +{ + struct chsc_scpd *scpd_area; + int ccode, ret; + + if ((rfmt == 1 || rfmt == 0) && c == 1 && + !css_general_characteristics.fcs) + return -EINVAL; + if ((rfmt == 2) && !css_general_characteristics.cib) + return -EINVAL; + if ((rfmt == 3) && !css_general_characteristics.util_str) + return -EINVAL; + + memset(page, 0, PAGE_SIZE); + scpd_area = page; + scpd_area->request.length = 0x0010; + scpd_area->request.code = 0x0002; + scpd_area->cssid = chpid.cssid; + scpd_area->first_chpid = chpid.id; + scpd_area->last_chpid = chpid.id; + scpd_area->m = m; + scpd_area->c = c; + scpd_area->fmt = fmt; + scpd_area->rfmt = rfmt; + + ccode = chsc(scpd_area); + if (ccode > 0) + return (ccode == 3) ? -ENODEV : -EBUSY; + + ret = chsc_error_from_response(scpd_area->response.code); + if (ret) + CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n", + scpd_area->response.code); + return ret; +} +EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc); + +#define chsc_det_chp_desc(FMT, c) \ +int chsc_determine_fmt##FMT##_channel_path_desc( \ + struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc) \ +{ \ + struct chsc_scpd *scpd_area; \ + unsigned long flags; \ + int ret; \ + \ + spin_lock_irqsave(&chsc_page_lock, flags); \ + scpd_area = chsc_page; \ + ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0, \ + scpd_area); \ + if (ret) \ + goto out; \ + \ + memcpy(desc, scpd_area->data, sizeof(*desc)); \ +out: \ + spin_unlock_irqrestore(&chsc_page_lock, flags); \ + return ret; \ +} + +chsc_det_chp_desc(0, 0) +chsc_det_chp_desc(1, 1) +chsc_det_chp_desc(3, 0) + +static void +chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv, + struct cmg_chars *chars) +{ + int i, mask; + + for (i = 0; i < NR_MEASUREMENT_CHARS; i++) { + mask = 0x80 >> (i + 3); + if (cmcv & mask) + chp->cmg_chars.values[i] = chars->values[i]; + else + chp->cmg_chars.values[i] = 0; + } +} + +int chsc_get_channel_measurement_chars(struct channel_path *chp) +{ + unsigned long flags; + int ccode, ret; + + struct { + struct chsc_header request; + u32 : 24; + u32 first_chpid : 8; + u32 : 24; + u32 last_chpid : 8; + u32 zeroes1; + struct chsc_header response; + u32 zeroes2; + u32 not_valid : 1; + u32 shared : 1; + u32 : 22; + u32 chpid : 8; + u32 cmcv : 5; + u32 : 11; + u32 cmgq : 8; + u32 cmg : 8; + u32 zeroes3; + u32 data[NR_MEASUREMENT_CHARS]; + } *scmc_area; + + chp->shared = -1; + chp->cmg = -1; + + if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm) + return -EINVAL; + + spin_lock_irqsave(&chsc_page_lock, flags); + memset(chsc_page, 0, PAGE_SIZE); + scmc_area = chsc_page; + scmc_area->request.length = 0x0010; + scmc_area->request.code = 0x0022; + scmc_area->first_chpid = chp->chpid.id; + scmc_area->last_chpid = chp->chpid.id; + + ccode = chsc(scmc_area); + if (ccode > 0) { + ret = (ccode == 3) ? -ENODEV : -EBUSY; + goto out; + } + + ret = chsc_error_from_response(scmc_area->response.code); + if (ret) { + CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n", + scmc_area->response.code); + goto out; + } + if (scmc_area->not_valid) + goto out; + + chp->cmg = scmc_area->cmg; + chp->shared = scmc_area->shared; + if (chp->cmg != 2 && chp->cmg != 3) { + /* No cmg-dependent data. */ + goto out; + } + chsc_initialize_cmg_chars(chp, scmc_area->cmcv, + (struct cmg_chars *) &scmc_area->data); +out: + spin_unlock_irqrestore(&chsc_page_lock, flags); + return ret; +} + +int __init chsc_init(void) +{ + int ret; + + sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sei_page || !chsc_page) { + ret = -ENOMEM; + goto out_err; + } + ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw); + if (ret) + goto out_err; + return ret; +out_err: + free_page((unsigned long)chsc_page); + free_page((unsigned long)sei_page); + return ret; +} + +void __init chsc_init_cleanup(void) +{ + crw_unregister_handler(CRW_RSC_CSS); + free_page((unsigned long)chsc_page); + free_page((unsigned long)sei_page); +} + +int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code) +{ + int ret; + + sda_area->request.length = 0x0400; + sda_area->request.code = 0x0031; + sda_area->operation_code = operation_code; + + ret = chsc(sda_area); + if (ret > 0) { + ret = (ret == 3) ? -ENODEV : -EBUSY; + goto out; + } + + switch (sda_area->response.code) { + case 0x0101: + ret = -EOPNOTSUPP; + break; + default: + ret = chsc_error_from_response(sda_area->response.code); + } +out: + return ret; +} + +int chsc_enable_facility(int operation_code) +{ + struct chsc_sda_area *sda_area; + unsigned long flags; + int ret; + + spin_lock_irqsave(&chsc_page_lock, flags); + memset(chsc_page, 0, PAGE_SIZE); + sda_area = chsc_page; + + ret = __chsc_enable_facility(sda_area, operation_code); + if (ret != 0) + CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n", + operation_code, sda_area->response.code); + + spin_unlock_irqrestore(&chsc_page_lock, flags); + return ret; +} + +int __init chsc_get_cssid(int idx) +{ + struct { + struct chsc_header request; + u8 atype; + u32 : 24; + u32 reserved1[6]; + struct chsc_header response; + u32 reserved2[3]; + struct { + u8 cssid; + u32 : 24; + } list[0]; + } *sdcal_area; + int ret; + + spin_lock_irq(&chsc_page_lock); + memset(chsc_page, 0, PAGE_SIZE); + sdcal_area = chsc_page; + sdcal_area->request.length = 0x0020; + sdcal_area->request.code = 0x0034; + sdcal_area->atype = 4; + + ret = chsc(sdcal_area); + if (ret) { + ret = (ret == 3) ? -ENODEV : -EBUSY; + goto exit; + } + + ret = chsc_error_from_response(sdcal_area->response.code); + if (ret) { + CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n", + sdcal_area->response.code); + goto exit; + } + + if ((addr_t) &sdcal_area->list[idx] < + (addr_t) &sdcal_area->response + sdcal_area->response.length) + ret = sdcal_area->list[idx].cssid; + else + ret = -ENODEV; +exit: + spin_unlock_irq(&chsc_page_lock); + return ret; +} + +struct css_general_char css_general_characteristics; +struct css_chsc_char css_chsc_characteristics; + +int __init +chsc_determine_css_characteristics(void) +{ + unsigned long flags; + int result; + struct { + struct chsc_header request; + u32 reserved1; + u32 reserved2; + u32 reserved3; + struct chsc_header response; + u32 reserved4; + u32 general_char[510]; + u32 chsc_char[508]; + } *scsc_area; + + spin_lock_irqsave(&chsc_page_lock, flags); + memset(chsc_page, 0, PAGE_SIZE); + scsc_area = chsc_page; + scsc_area->request.length = 0x0010; + scsc_area->request.code = 0x0010; + + result = chsc(scsc_area); + if (result) { + result = (result == 3) ? -ENODEV : -EBUSY; + goto exit; + } + + result = chsc_error_from_response(scsc_area->response.code); + if (result == 0) { + memcpy(&css_general_characteristics, scsc_area->general_char, + sizeof(css_general_characteristics)); + memcpy(&css_chsc_characteristics, scsc_area->chsc_char, + sizeof(css_chsc_characteristics)); + } else + CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n", + scsc_area->response.code); +exit: + spin_unlock_irqrestore(&chsc_page_lock, flags); + return result; +} + +EXPORT_SYMBOL_GPL(css_general_characteristics); +EXPORT_SYMBOL_GPL(css_chsc_characteristics); + +int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta) +{ + struct { + struct chsc_header request; + unsigned int rsvd0; + unsigned int op : 8; + unsigned int rsvd1 : 8; + unsigned int ctrl : 16; + unsigned int rsvd2[5]; + struct chsc_header response; + unsigned int rsvd3[3]; + u64 clock_delta; + unsigned int rsvd4[2]; + } *rr; + int rc; + + memset(page, 0, PAGE_SIZE); + rr = page; + rr->request.length = 0x0020; + rr->request.code = 0x0033; + rr->op = op; + rr->ctrl = ctrl; + rc = chsc(rr); + if (rc) + return -EIO; + rc = (rr->response.code == 0x0001) ? 0 : -EIO; + if (clock_delta) + *clock_delta = rr->clock_delta; + return rc; +} + +int chsc_sstpi(void *page, void *result, size_t size) +{ + struct { + struct chsc_header request; + unsigned int rsvd0[3]; + struct chsc_header response; + char data[]; + } *rr; + int rc; + + memset(page, 0, PAGE_SIZE); + rr = page; + rr->request.length = 0x0010; + rr->request.code = 0x0038; + rc = chsc(rr); + if (rc) + return -EIO; + memcpy(result, &rr->data, size); + return (rr->response.code == 0x0001) ? 0 : -EIO; +} + +int chsc_siosl(struct subchannel_id schid) +{ + struct { + struct chsc_header request; + u32 word1; + struct subchannel_id sid; + u32 word3; + struct chsc_header response; + u32 word[11]; + } *siosl_area; + unsigned long flags; + int ccode; + int rc; + + spin_lock_irqsave(&chsc_page_lock, flags); + memset(chsc_page, 0, PAGE_SIZE); + siosl_area = chsc_page; + siosl_area->request.length = 0x0010; + siosl_area->request.code = 0x0046; + siosl_area->word1 = 0x80000000; + siosl_area->sid = schid; + + ccode = chsc(siosl_area); + if (ccode > 0) { + if (ccode == 3) + rc = -ENODEV; + else + rc = -EBUSY; + CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n", + schid.ssid, schid.sch_no, ccode); + goto out; + } + rc = chsc_error_from_response(siosl_area->response.code); + if (rc) + CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n", + schid.ssid, schid.sch_no, + siosl_area->response.code); + else + CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n", + schid.ssid, schid.sch_no); +out: + spin_unlock_irqrestore(&chsc_page_lock, flags); + return rc; +} +EXPORT_SYMBOL_GPL(chsc_siosl); + +/** + * chsc_scm_info() - store SCM information (SSI) + * @scm_area: request and response block for SSI + * @token: continuation token + * + * Returns 0 on success. + */ +int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token) +{ + int ccode, ret; + + memset(scm_area, 0, sizeof(*scm_area)); + scm_area->request.length = 0x0020; + scm_area->request.code = 0x004C; + scm_area->reqtok = token; + + ccode = chsc(scm_area); + if (ccode > 0) { + ret = (ccode == 3) ? -ENODEV : -EBUSY; + goto out; + } + ret = chsc_error_from_response(scm_area->response.code); + if (ret != 0) + CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n", + scm_area->response.code); +out: + return ret; +} +EXPORT_SYMBOL_GPL(chsc_scm_info); + +/** + * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info. + * @schid: id of the subchannel on which PNSO is performed + * @brinfo_area: request and response block for the operation + * @resume_token: resume token for multiblock response + * @cnc: Boolean change-notification control + * + * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL) + * + * Returns 0 on success. + */ +int chsc_pnso_brinfo(struct subchannel_id schid, + struct chsc_pnso_area *brinfo_area, + struct chsc_brinfo_resume_token resume_token, + int cnc) +{ + memset(brinfo_area, 0, sizeof(*brinfo_area)); + brinfo_area->request.length = 0x0030; + brinfo_area->request.code = 0x003d; /* network-subchannel operation */ + brinfo_area->m = schid.m; + brinfo_area->ssid = schid.ssid; + brinfo_area->sch = schid.sch_no; + brinfo_area->cssid = schid.cssid; + brinfo_area->oc = 0; /* Store-network-bridging-information list */ + brinfo_area->resume_token = resume_token; + brinfo_area->n = (cnc != 0); + if (chsc(brinfo_area)) + return -EIO; + return chsc_error_from_response(brinfo_area->response.code); +} +EXPORT_SYMBOL_GPL(chsc_pnso_brinfo); diff --git a/drivers/s390/cio/chsc.h b/drivers/s390/cio/chsc.h new file mode 100644 index 000000000..78aba8d94 --- /dev/null +++ b/drivers/s390/cio/chsc.h @@ -0,0 +1,264 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef S390_CHSC_H +#define S390_CHSC_H + +#include +#include +#include +#include +#include +#include +#include + +#define CHSC_SDA_OC_MSS 0x2 + +#define NR_MEASUREMENT_CHARS 5 +struct cmg_chars { + u32 values[NR_MEASUREMENT_CHARS]; +}; + +#define NR_MEASUREMENT_ENTRIES 8 +struct cmg_entry { + u32 values[NR_MEASUREMENT_ENTRIES]; +}; + +struct channel_path_desc_fmt1 { + u8 flags; + u8 lsn; + u8 desc; + u8 chpid; + u32:24; + u8 chpp; + u32 unused[2]; + u16 chid; + u32:16; + u16 mdc; + u16:13; + u8 r:1; + u8 s:1; + u8 f:1; + u32 zeros[2]; +}; + +struct channel_path_desc_fmt3 { + struct channel_path_desc_fmt1 fmt1_desc; + u8 util_str[64]; +}; + +struct channel_path; + +struct css_chsc_char { + u64 res; + u64 : 20; + u32 secm : 1; /* bit 84 */ + u32 : 1; + u32 scmc : 1; /* bit 86 */ + u32 : 20; + u32 scssc : 1; /* bit 107 */ + u32 scsscf : 1; /* bit 108 */ + u32:7; + u32 pnso:1; /* bit 116 */ + u32:11; +} __packed; + +extern struct css_chsc_char css_chsc_characteristics; + +struct chsc_ssd_info { + u8 path_mask; + u8 fla_valid_mask; + struct chp_id chpid[8]; + u16 fla[8]; +}; + +struct chsc_ssqd_area { + struct chsc_header request; + u16:10; + u8 ssid:2; + u8 fmt:4; + u16 first_sch; + u16:16; + u16 last_sch; + u32:32; + struct chsc_header response; + u32:32; + struct qdio_ssqd_desc qdio_ssqd; +} __packed __aligned(PAGE_SIZE); + +struct chsc_scssc_area { + struct chsc_header request; + u16 operation_code; + u16:16; + u32:32; + u32:32; + u64 summary_indicator_addr; + u64 subchannel_indicator_addr; + u32 ks:4; + u32 kc:4; + u32:21; + u32 isc:3; + u32 word_with_d_bit; + u32:32; + struct subchannel_id schid; + u32 reserved[1004]; + struct chsc_header response; + u32:32; +} __packed __aligned(PAGE_SIZE); + +struct chsc_scpd { + struct chsc_header request; + u32:2; + u32 m:1; + u32 c:1; + u32 fmt:4; + u32 cssid:8; + u32:4; + u32 rfmt:4; + u32 first_chpid:8; + u32:24; + u32 last_chpid:8; + u32 zeroes1; + struct chsc_header response; + u32:32; + u8 data[0]; +} __packed __aligned(PAGE_SIZE); + +struct chsc_sda_area { + struct chsc_header request; + u8 :4; + u8 format:4; + u8 :8; + u16 operation_code; + u32 :32; + u32 :32; + u32 operation_data_area[252]; + struct chsc_header response; + u32 :4; + u32 format2:4; + u32 :24; +} __packed __aligned(PAGE_SIZE); + +extern int chsc_get_ssd_info(struct subchannel_id schid, + struct chsc_ssd_info *ssd); +extern int chsc_determine_css_characteristics(void); +extern int chsc_init(void); +extern void chsc_init_cleanup(void); + +int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code); +extern int chsc_enable_facility(int); +struct channel_subsystem; +extern int chsc_secm(struct channel_subsystem *, int); +int __chsc_do_secm(struct channel_subsystem *css, int enable); + +int chsc_chp_vary(struct chp_id chpid, int on); +int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt, + int c, int m, void *page); +int chsc_determine_fmt0_channel_path_desc(struct chp_id chpid, + struct channel_path_desc_fmt0 *desc); +int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid, + struct channel_path_desc_fmt1 *desc); +int chsc_determine_fmt3_channel_path_desc(struct chp_id chpid, + struct channel_path_desc_fmt3 *desc); +void chsc_chp_online(struct chp_id chpid); +void chsc_chp_offline(struct chp_id chpid); +int chsc_get_channel_measurement_chars(struct channel_path *chp); +int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd); +int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc, + u64 summary_indicator_addr, u64 subchannel_indicator_addr); +int chsc_error_from_response(int response); + +int chsc_siosl(struct subchannel_id schid); + +/* Functions and definitions to query storage-class memory. */ +struct sale { + u64 sa; + u32 p:4; + u32 op_state:4; + u32 data_state:4; + u32 rank:4; + u32 r:1; + u32:7; + u32 rid:8; + u32:32; +} __packed; + +struct chsc_scm_info { + struct chsc_header request; + u32:32; + u64 reqtok; + u32 reserved1[4]; + struct chsc_header response; + u64:56; + u8 rq; + u32 mbc; + u64 msa; + u16 is; + u16 mmc; + u32 mci; + u64 nr_scm_ini; + u64 nr_scm_unini; + u32 reserved2[10]; + u64 restok; + struct sale scmal[248]; +} __packed __aligned(PAGE_SIZE); + +int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token); + +struct chsc_brinfo_resume_token { + u64 t1; + u64 t2; +} __packed; + +struct chsc_brinfo_naihdr { + struct chsc_brinfo_resume_token resume_token; + u32:32; + u32 instance; + u32:24; + u8 naids; + u32 reserved[3]; +} __packed; + +struct chsc_pnso_area { + struct chsc_header request; + u8:2; + u8 m:1; + u8:5; + u8:2; + u8 ssid:2; + u8 fmt:4; + u16 sch; + u8:8; + u8 cssid; + u16:16; + u8 oc; + u32:24; + struct chsc_brinfo_resume_token resume_token; + u32 n:1; + u32:31; + u32 reserved[3]; + struct chsc_header response; + u32:32; + struct chsc_brinfo_naihdr naihdr; + union { + struct qdio_brinfo_entry_l3_ipv6 l3_ipv6[0]; + struct qdio_brinfo_entry_l3_ipv4 l3_ipv4[0]; + struct qdio_brinfo_entry_l2 l2[0]; + } entries; +} __packed __aligned(PAGE_SIZE); + +int chsc_pnso_brinfo(struct subchannel_id schid, + struct chsc_pnso_area *brinfo_area, + struct chsc_brinfo_resume_token resume_token, + int cnc); + +int __init chsc_get_cssid(int idx); + +#ifdef CONFIG_SCM_BUS +int scm_update_information(void); +int scm_process_availability_information(void); +#else /* CONFIG_SCM_BUS */ +static inline int scm_update_information(void) { return 0; } +static inline int scm_process_availability_information(void) { return 0; } +#endif /* CONFIG_SCM_BUS */ + + +#endif diff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c new file mode 100644 index 000000000..8d9f36625 --- /dev/null +++ b/drivers/s390/cio/chsc_sch.c @@ -0,0 +1,1012 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for s390 chsc subchannels + * + * Copyright IBM Corp. 2008, 2011 + * + * Author(s): Cornelia Huck + * + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "cio.h" +#include "cio_debug.h" +#include "css.h" +#include "chsc_sch.h" +#include "ioasm.h" + +static debug_info_t *chsc_debug_msg_id; +static debug_info_t *chsc_debug_log_id; + +static struct chsc_request *on_close_request; +static struct chsc_async_area *on_close_chsc_area; +static DEFINE_MUTEX(on_close_mutex); + +#define CHSC_MSG(imp, args...) do { \ + debug_sprintf_event(chsc_debug_msg_id, imp , ##args); \ + } while (0) + +#define CHSC_LOG(imp, txt) do { \ + debug_text_event(chsc_debug_log_id, imp , txt); \ + } while (0) + +static void CHSC_LOG_HEX(int level, void *data, int length) +{ + debug_event(chsc_debug_log_id, level, data, length); +} + +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("driver for s390 chsc subchannels"); +MODULE_LICENSE("GPL"); + +static void chsc_subchannel_irq(struct subchannel *sch) +{ + struct chsc_private *private = dev_get_drvdata(&sch->dev); + struct chsc_request *request = private->request; + struct irb *irb = this_cpu_ptr(&cio_irb); + + CHSC_LOG(4, "irb"); + CHSC_LOG_HEX(4, irb, sizeof(*irb)); + inc_irq_stat(IRQIO_CSC); + + /* Copy irb to provided request and set done. */ + if (!request) { + CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n", + sch->schid.ssid, sch->schid.sch_no); + return; + } + private->request = NULL; + memcpy(&request->irb, irb, sizeof(*irb)); + cio_update_schib(sch); + complete(&request->completion); + put_device(&sch->dev); +} + +static int chsc_subchannel_probe(struct subchannel *sch) +{ + struct chsc_private *private; + int ret; + + CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n", + sch->schid.ssid, sch->schid.sch_no); + sch->isc = CHSC_SCH_ISC; + private = kzalloc(sizeof(*private), GFP_KERNEL); + if (!private) + return -ENOMEM; + dev_set_drvdata(&sch->dev, private); + ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch); + if (ret) { + CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n", + sch->schid.ssid, sch->schid.sch_no, ret); + dev_set_drvdata(&sch->dev, NULL); + kfree(private); + } else { + if (dev_get_uevent_suppress(&sch->dev)) { + dev_set_uevent_suppress(&sch->dev, 0); + kobject_uevent(&sch->dev.kobj, KOBJ_ADD); + } + } + return ret; +} + +static int chsc_subchannel_remove(struct subchannel *sch) +{ + struct chsc_private *private; + + cio_disable_subchannel(sch); + private = dev_get_drvdata(&sch->dev); + dev_set_drvdata(&sch->dev, NULL); + if (private->request) { + complete(&private->request->completion); + put_device(&sch->dev); + } + kfree(private); + return 0; +} + +static void chsc_subchannel_shutdown(struct subchannel *sch) +{ + cio_disable_subchannel(sch); +} + +static int chsc_subchannel_prepare(struct subchannel *sch) +{ + int cc; + struct schib schib; + /* + * Don't allow suspend while the subchannel is not idle + * since we don't have a way to clear the subchannel and + * cannot disable it with a request running. + */ + cc = stsch(sch->schid, &schib); + if (!cc && scsw_stctl(&schib.scsw)) + return -EAGAIN; + return 0; +} + +static int chsc_subchannel_freeze(struct subchannel *sch) +{ + return cio_disable_subchannel(sch); +} + +static int chsc_subchannel_restore(struct subchannel *sch) +{ + return cio_enable_subchannel(sch, (u32)(unsigned long)sch); +} + +static struct css_device_id chsc_subchannel_ids[] = { + { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, }, + { /* end of list */ }, +}; +MODULE_DEVICE_TABLE(css, chsc_subchannel_ids); + +static struct css_driver chsc_subchannel_driver = { + .drv = { + .owner = THIS_MODULE, + .name = "chsc_subchannel", + }, + .subchannel_type = chsc_subchannel_ids, + .irq = chsc_subchannel_irq, + .probe = chsc_subchannel_probe, + .remove = chsc_subchannel_remove, + .shutdown = chsc_subchannel_shutdown, + .prepare = chsc_subchannel_prepare, + .freeze = chsc_subchannel_freeze, + .thaw = chsc_subchannel_restore, + .restore = chsc_subchannel_restore, +}; + +static int __init chsc_init_dbfs(void) +{ + chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long)); + if (!chsc_debug_msg_id) + goto out; + debug_register_view(chsc_debug_msg_id, &debug_sprintf_view); + debug_set_level(chsc_debug_msg_id, 2); + chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16); + if (!chsc_debug_log_id) + goto out; + debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view); + debug_set_level(chsc_debug_log_id, 2); + return 0; +out: + debug_unregister(chsc_debug_msg_id); + return -ENOMEM; +} + +static void chsc_remove_dbfs(void) +{ + debug_unregister(chsc_debug_log_id); + debug_unregister(chsc_debug_msg_id); +} + +static int __init chsc_init_sch_driver(void) +{ + return css_driver_register(&chsc_subchannel_driver); +} + +static void chsc_cleanup_sch_driver(void) +{ + css_driver_unregister(&chsc_subchannel_driver); +} + +static DEFINE_SPINLOCK(chsc_lock); + +static int chsc_subchannel_match_next_free(struct device *dev, void *data) +{ + struct subchannel *sch = to_subchannel(dev); + + return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw); +} + +static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch) +{ + struct device *dev; + + dev = driver_find_device(&chsc_subchannel_driver.drv, + sch ? &sch->dev : NULL, NULL, + chsc_subchannel_match_next_free); + return dev ? to_subchannel(dev) : NULL; +} + +/** + * chsc_async() - try to start a chsc request asynchronously + * @chsc_area: request to be started + * @request: request structure to associate + * + * Tries to start a chsc request on one of the existing chsc subchannels. + * Returns: + * %0 if the request was performed synchronously + * %-EINPROGRESS if the request was successfully started + * %-EBUSY if all chsc subchannels are busy + * %-ENODEV if no chsc subchannels are available + * Context: + * interrupts disabled, chsc_lock held + */ +static int chsc_async(struct chsc_async_area *chsc_area, + struct chsc_request *request) +{ + int cc; + struct chsc_private *private; + struct subchannel *sch = NULL; + int ret = -ENODEV; + char dbf[10]; + + chsc_area->header.key = PAGE_DEFAULT_KEY >> 4; + while ((sch = chsc_get_next_subchannel(sch))) { + spin_lock(sch->lock); + private = dev_get_drvdata(&sch->dev); + if (private->request) { + spin_unlock(sch->lock); + ret = -EBUSY; + continue; + } + chsc_area->header.sid = sch->schid; + CHSC_LOG(2, "schid"); + CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid)); + cc = chsc(chsc_area); + snprintf(dbf, sizeof(dbf), "cc:%d", cc); + CHSC_LOG(2, dbf); + switch (cc) { + case 0: + ret = 0; + break; + case 1: + sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC; + ret = -EINPROGRESS; + private->request = request; + break; + case 2: + ret = -EBUSY; + break; + default: + ret = -ENODEV; + } + spin_unlock(sch->lock); + CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n", + sch->schid.ssid, sch->schid.sch_no, cc); + if (ret == -EINPROGRESS) + return -EINPROGRESS; + put_device(&sch->dev); + if (ret == 0) + return 0; + } + return ret; +} + +static void chsc_log_command(void *chsc_area) +{ + char dbf[10]; + + snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]); + CHSC_LOG(0, dbf); + CHSC_LOG_HEX(0, chsc_area, 32); +} + +static int chsc_examine_irb(struct chsc_request *request) +{ + int backed_up; + + if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND)) + return -EIO; + backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK; + request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK; + if (scsw_cstat(&request->irb.scsw) == 0) + return 0; + if (!backed_up) + return 0; + if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK) + return -EIO; + if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK) + return -EPERM; + if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK) + return -EAGAIN; + if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK) + return -EAGAIN; + return -EIO; +} + +static int chsc_ioctl_start(void __user *user_area) +{ + struct chsc_request *request; + struct chsc_async_area *chsc_area; + int ret; + char dbf[10]; + + if (!css_general_characteristics.dynio) + /* It makes no sense to try. */ + return -EOPNOTSUPP; + chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL); + if (!chsc_area) + return -ENOMEM; + request = kzalloc(sizeof(*request), GFP_KERNEL); + if (!request) { + ret = -ENOMEM; + goto out_free; + } + init_completion(&request->completion); + if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) { + ret = -EFAULT; + goto out_free; + } + chsc_log_command(chsc_area); + spin_lock_irq(&chsc_lock); + ret = chsc_async(chsc_area, request); + spin_unlock_irq(&chsc_lock); + if (ret == -EINPROGRESS) { + wait_for_completion(&request->completion); + ret = chsc_examine_irb(request); + } + /* copy area back to user */ + if (!ret) + if (copy_to_user(user_area, chsc_area, PAGE_SIZE)) + ret = -EFAULT; +out_free: + snprintf(dbf, sizeof(dbf), "ret:%d", ret); + CHSC_LOG(0, dbf); + kfree(request); + free_page((unsigned long)chsc_area); + return ret; +} + +static int chsc_ioctl_on_close_set(void __user *user_area) +{ + char dbf[13]; + int ret; + + mutex_lock(&on_close_mutex); + if (on_close_chsc_area) { + ret = -EBUSY; + goto out_unlock; + } + on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL); + if (!on_close_request) { + ret = -ENOMEM; + goto out_unlock; + } + on_close_chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL); + if (!on_close_chsc_area) { + ret = -ENOMEM; + goto out_free_request; + } + if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) { + ret = -EFAULT; + goto out_free_chsc; + } + ret = 0; + goto out_unlock; + +out_free_chsc: + free_page((unsigned long)on_close_chsc_area); + on_close_chsc_area = NULL; +out_free_request: + kfree(on_close_request); + on_close_request = NULL; +out_unlock: + mutex_unlock(&on_close_mutex); + snprintf(dbf, sizeof(dbf), "ocsret:%d", ret); + CHSC_LOG(0, dbf); + return ret; +} + +static int chsc_ioctl_on_close_remove(void) +{ + char dbf[13]; + int ret; + + mutex_lock(&on_close_mutex); + if (!on_close_chsc_area) { + ret = -ENOENT; + goto out_unlock; + } + free_page((unsigned long)on_close_chsc_area); + on_close_chsc_area = NULL; + kfree(on_close_request); + on_close_request = NULL; + ret = 0; +out_unlock: + mutex_unlock(&on_close_mutex); + snprintf(dbf, sizeof(dbf), "ocrret:%d", ret); + CHSC_LOG(0, dbf); + return ret; +} + +static int chsc_ioctl_start_sync(void __user *user_area) +{ + struct chsc_sync_area *chsc_area; + int ret, ccode; + + chsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!chsc_area) + return -ENOMEM; + if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) { + ret = -EFAULT; + goto out_free; + } + if (chsc_area->header.code & 0x4000) { + ret = -EINVAL; + goto out_free; + } + chsc_log_command(chsc_area); + ccode = chsc(chsc_area); + if (ccode != 0) { + ret = -EIO; + goto out_free; + } + if (copy_to_user(user_area, chsc_area, PAGE_SIZE)) + ret = -EFAULT; + else + ret = 0; +out_free: + free_page((unsigned long)chsc_area); + return ret; +} + +static int chsc_ioctl_info_channel_path(void __user *user_cd) +{ + struct chsc_chp_cd *cd; + int ret, ccode; + struct { + struct chsc_header request; + u32 : 2; + u32 m : 1; + u32 : 1; + u32 fmt1 : 4; + u32 cssid : 8; + u32 : 8; + u32 first_chpid : 8; + u32 : 24; + u32 last_chpid : 8; + u32 : 32; + struct chsc_header response; + u8 data[PAGE_SIZE - 20]; + } __attribute__ ((packed)) *scpcd_area; + + scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!scpcd_area) + return -ENOMEM; + cd = kzalloc(sizeof(*cd), GFP_KERNEL); + if (!cd) { + ret = -ENOMEM; + goto out_free; + } + if (copy_from_user(cd, user_cd, sizeof(*cd))) { + ret = -EFAULT; + goto out_free; + } + scpcd_area->request.length = 0x0010; + scpcd_area->request.code = 0x0028; + scpcd_area->m = cd->m; + scpcd_area->fmt1 = cd->fmt; + scpcd_area->cssid = cd->chpid.cssid; + scpcd_area->first_chpid = cd->chpid.id; + scpcd_area->last_chpid = cd->chpid.id; + + ccode = chsc(scpcd_area); + if (ccode != 0) { + ret = -EIO; + goto out_free; + } + if (scpcd_area->response.code != 0x0001) { + ret = -EIO; + CHSC_MSG(0, "scpcd: response code=%x\n", + scpcd_area->response.code); + goto out_free; + } + memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length); + if (copy_to_user(user_cd, cd, sizeof(*cd))) + ret = -EFAULT; + else + ret = 0; +out_free: + kfree(cd); + free_page((unsigned long)scpcd_area); + return ret; +} + +static int chsc_ioctl_info_cu(void __user *user_cd) +{ + struct chsc_cu_cd *cd; + int ret, ccode; + struct { + struct chsc_header request; + u32 : 2; + u32 m : 1; + u32 : 1; + u32 fmt1 : 4; + u32 cssid : 8; + u32 : 8; + u32 first_cun : 8; + u32 : 24; + u32 last_cun : 8; + u32 : 32; + struct chsc_header response; + u8 data[PAGE_SIZE - 20]; + } __attribute__ ((packed)) *scucd_area; + + scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!scucd_area) + return -ENOMEM; + cd = kzalloc(sizeof(*cd), GFP_KERNEL); + if (!cd) { + ret = -ENOMEM; + goto out_free; + } + if (copy_from_user(cd, user_cd, sizeof(*cd))) { + ret = -EFAULT; + goto out_free; + } + scucd_area->request.length = 0x0010; + scucd_area->request.code = 0x0026; + scucd_area->m = cd->m; + scucd_area->fmt1 = cd->fmt; + scucd_area->cssid = cd->cssid; + scucd_area->first_cun = cd->cun; + scucd_area->last_cun = cd->cun; + + ccode = chsc(scucd_area); + if (ccode != 0) { + ret = -EIO; + goto out_free; + } + if (scucd_area->response.code != 0x0001) { + ret = -EIO; + CHSC_MSG(0, "scucd: response code=%x\n", + scucd_area->response.code); + goto out_free; + } + memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length); + if (copy_to_user(user_cd, cd, sizeof(*cd))) + ret = -EFAULT; + else + ret = 0; +out_free: + kfree(cd); + free_page((unsigned long)scucd_area); + return ret; +} + +static int chsc_ioctl_info_sch_cu(void __user *user_cud) +{ + struct chsc_sch_cud *cud; + int ret, ccode; + struct { + struct chsc_header request; + u32 : 2; + u32 m : 1; + u32 : 5; + u32 fmt1 : 4; + u32 : 2; + u32 ssid : 2; + u32 first_sch : 16; + u32 : 8; + u32 cssid : 8; + u32 last_sch : 16; + u32 : 32; + struct chsc_header response; + u8 data[PAGE_SIZE - 20]; + } __attribute__ ((packed)) *sscud_area; + + sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sscud_area) + return -ENOMEM; + cud = kzalloc(sizeof(*cud), GFP_KERNEL); + if (!cud) { + ret = -ENOMEM; + goto out_free; + } + if (copy_from_user(cud, user_cud, sizeof(*cud))) { + ret = -EFAULT; + goto out_free; + } + sscud_area->request.length = 0x0010; + sscud_area->request.code = 0x0006; + sscud_area->m = cud->schid.m; + sscud_area->fmt1 = cud->fmt; + sscud_area->ssid = cud->schid.ssid; + sscud_area->first_sch = cud->schid.sch_no; + sscud_area->cssid = cud->schid.cssid; + sscud_area->last_sch = cud->schid.sch_no; + + ccode = chsc(sscud_area); + if (ccode != 0) { + ret = -EIO; + goto out_free; + } + if (sscud_area->response.code != 0x0001) { + ret = -EIO; + CHSC_MSG(0, "sscud: response code=%x\n", + sscud_area->response.code); + goto out_free; + } + memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length); + if (copy_to_user(user_cud, cud, sizeof(*cud))) + ret = -EFAULT; + else + ret = 0; +out_free: + kfree(cud); + free_page((unsigned long)sscud_area); + return ret; +} + +static int chsc_ioctl_conf_info(void __user *user_ci) +{ + struct chsc_conf_info *ci; + int ret, ccode; + struct { + struct chsc_header request; + u32 : 2; + u32 m : 1; + u32 : 1; + u32 fmt1 : 4; + u32 cssid : 8; + u32 : 6; + u32 ssid : 2; + u32 : 8; + u64 : 64; + struct chsc_header response; + u8 data[PAGE_SIZE - 20]; + } __attribute__ ((packed)) *sci_area; + + sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sci_area) + return -ENOMEM; + ci = kzalloc(sizeof(*ci), GFP_KERNEL); + if (!ci) { + ret = -ENOMEM; + goto out_free; + } + if (copy_from_user(ci, user_ci, sizeof(*ci))) { + ret = -EFAULT; + goto out_free; + } + sci_area->request.length = 0x0010; + sci_area->request.code = 0x0012; + sci_area->m = ci->id.m; + sci_area->fmt1 = ci->fmt; + sci_area->cssid = ci->id.cssid; + sci_area->ssid = ci->id.ssid; + + ccode = chsc(sci_area); + if (ccode != 0) { + ret = -EIO; + goto out_free; + } + if (sci_area->response.code != 0x0001) { + ret = -EIO; + CHSC_MSG(0, "sci: response code=%x\n", + sci_area->response.code); + goto out_free; + } + memcpy(&ci->scid, &sci_area->response, sci_area->response.length); + if (copy_to_user(user_ci, ci, sizeof(*ci))) + ret = -EFAULT; + else + ret = 0; +out_free: + kfree(ci); + free_page((unsigned long)sci_area); + return ret; +} + +static int chsc_ioctl_conf_comp_list(void __user *user_ccl) +{ + struct chsc_comp_list *ccl; + int ret, ccode; + struct { + struct chsc_header request; + u32 ctype : 8; + u32 : 4; + u32 fmt : 4; + u32 : 16; + u64 : 64; + u32 list_parm[2]; + u64 : 64; + struct chsc_header response; + u8 data[PAGE_SIZE - 36]; + } __attribute__ ((packed)) *sccl_area; + struct { + u32 m : 1; + u32 : 31; + u32 cssid : 8; + u32 : 16; + u32 chpid : 8; + } __attribute__ ((packed)) *chpid_parm; + struct { + u32 f_cssid : 8; + u32 l_cssid : 8; + u32 : 16; + u32 res; + } __attribute__ ((packed)) *cssids_parm; + + sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sccl_area) + return -ENOMEM; + ccl = kzalloc(sizeof(*ccl), GFP_KERNEL); + if (!ccl) { + ret = -ENOMEM; + goto out_free; + } + if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) { + ret = -EFAULT; + goto out_free; + } + sccl_area->request.length = 0x0020; + sccl_area->request.code = 0x0030; + sccl_area->fmt = ccl->req.fmt; + sccl_area->ctype = ccl->req.ctype; + switch (sccl_area->ctype) { + case CCL_CU_ON_CHP: + case CCL_IOP_CHP: + chpid_parm = (void *)&sccl_area->list_parm; + chpid_parm->m = ccl->req.chpid.m; + chpid_parm->cssid = ccl->req.chpid.chp.cssid; + chpid_parm->chpid = ccl->req.chpid.chp.id; + break; + case CCL_CSS_IMG: + case CCL_CSS_IMG_CONF_CHAR: + cssids_parm = (void *)&sccl_area->list_parm; + cssids_parm->f_cssid = ccl->req.cssids.f_cssid; + cssids_parm->l_cssid = ccl->req.cssids.l_cssid; + break; + } + ccode = chsc(sccl_area); + if (ccode != 0) { + ret = -EIO; + goto out_free; + } + if (sccl_area->response.code != 0x0001) { + ret = -EIO; + CHSC_MSG(0, "sccl: response code=%x\n", + sccl_area->response.code); + goto out_free; + } + memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length); + if (copy_to_user(user_ccl, ccl, sizeof(*ccl))) + ret = -EFAULT; + else + ret = 0; +out_free: + kfree(ccl); + free_page((unsigned long)sccl_area); + return ret; +} + +static int chsc_ioctl_chpd(void __user *user_chpd) +{ + struct chsc_scpd *scpd_area; + struct chsc_cpd_info *chpd; + int ret; + + chpd = kzalloc(sizeof(*chpd), GFP_KERNEL); + scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!scpd_area || !chpd) { + ret = -ENOMEM; + goto out_free; + } + if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) { + ret = -EFAULT; + goto out_free; + } + ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt, + chpd->rfmt, chpd->c, chpd->m, + scpd_area); + if (ret) + goto out_free; + memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length); + if (copy_to_user(user_chpd, chpd, sizeof(*chpd))) + ret = -EFAULT; +out_free: + kfree(chpd); + free_page((unsigned long)scpd_area); + return ret; +} + +static int chsc_ioctl_dcal(void __user *user_dcal) +{ + struct chsc_dcal *dcal; + int ret, ccode; + struct { + struct chsc_header request; + u32 atype : 8; + u32 : 4; + u32 fmt : 4; + u32 : 16; + u32 res0[2]; + u32 list_parm[2]; + u32 res1[2]; + struct chsc_header response; + u8 data[PAGE_SIZE - 36]; + } __attribute__ ((packed)) *sdcal_area; + + sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!sdcal_area) + return -ENOMEM; + dcal = kzalloc(sizeof(*dcal), GFP_KERNEL); + if (!dcal) { + ret = -ENOMEM; + goto out_free; + } + if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) { + ret = -EFAULT; + goto out_free; + } + sdcal_area->request.length = 0x0020; + sdcal_area->request.code = 0x0034; + sdcal_area->atype = dcal->req.atype; + sdcal_area->fmt = dcal->req.fmt; + memcpy(&sdcal_area->list_parm, &dcal->req.list_parm, + sizeof(sdcal_area->list_parm)); + + ccode = chsc(sdcal_area); + if (ccode != 0) { + ret = -EIO; + goto out_free; + } + if (sdcal_area->response.code != 0x0001) { + ret = -EIO; + CHSC_MSG(0, "sdcal: response code=%x\n", + sdcal_area->response.code); + goto out_free; + } + memcpy(&dcal->sdcal, &sdcal_area->response, + sdcal_area->response.length); + if (copy_to_user(user_dcal, dcal, sizeof(*dcal))) + ret = -EFAULT; + else + ret = 0; +out_free: + kfree(dcal); + free_page((unsigned long)sdcal_area); + return ret; +} + +static long chsc_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + void __user *argp; + + CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd); + if (is_compat_task()) + argp = compat_ptr(arg); + else + argp = (void __user *)arg; + switch (cmd) { + case CHSC_START: + return chsc_ioctl_start(argp); + case CHSC_START_SYNC: + return chsc_ioctl_start_sync(argp); + case CHSC_INFO_CHANNEL_PATH: + return chsc_ioctl_info_channel_path(argp); + case CHSC_INFO_CU: + return chsc_ioctl_info_cu(argp); + case CHSC_INFO_SCH_CU: + return chsc_ioctl_info_sch_cu(argp); + case CHSC_INFO_CI: + return chsc_ioctl_conf_info(argp); + case CHSC_INFO_CCL: + return chsc_ioctl_conf_comp_list(argp); + case CHSC_INFO_CPD: + return chsc_ioctl_chpd(argp); + case CHSC_INFO_DCAL: + return chsc_ioctl_dcal(argp); + case CHSC_ON_CLOSE_SET: + return chsc_ioctl_on_close_set(argp); + case CHSC_ON_CLOSE_REMOVE: + return chsc_ioctl_on_close_remove(); + default: /* unknown ioctl number */ + return -ENOIOCTLCMD; + } +} + +static atomic_t chsc_ready_for_use = ATOMIC_INIT(1); + +static int chsc_open(struct inode *inode, struct file *file) +{ + if (!atomic_dec_and_test(&chsc_ready_for_use)) { + atomic_inc(&chsc_ready_for_use); + return -EBUSY; + } + return nonseekable_open(inode, file); +} + +static int chsc_release(struct inode *inode, struct file *filp) +{ + char dbf[13]; + int ret; + + mutex_lock(&on_close_mutex); + if (!on_close_chsc_area) + goto out_unlock; + init_completion(&on_close_request->completion); + CHSC_LOG(0, "on_close"); + chsc_log_command(on_close_chsc_area); + spin_lock_irq(&chsc_lock); + ret = chsc_async(on_close_chsc_area, on_close_request); + spin_unlock_irq(&chsc_lock); + if (ret == -EINPROGRESS) { + wait_for_completion(&on_close_request->completion); + ret = chsc_examine_irb(on_close_request); + } + snprintf(dbf, sizeof(dbf), "relret:%d", ret); + CHSC_LOG(0, dbf); + free_page((unsigned long)on_close_chsc_area); + on_close_chsc_area = NULL; + kfree(on_close_request); + on_close_request = NULL; +out_unlock: + mutex_unlock(&on_close_mutex); + atomic_inc(&chsc_ready_for_use); + return 0; +} + +static const struct file_operations chsc_fops = { + .owner = THIS_MODULE, + .open = chsc_open, + .release = chsc_release, + .unlocked_ioctl = chsc_ioctl, + .compat_ioctl = chsc_ioctl, + .llseek = no_llseek, +}; + +static struct miscdevice chsc_misc_device = { + .minor = MISC_DYNAMIC_MINOR, + .name = "chsc", + .fops = &chsc_fops, +}; + +static int __init chsc_misc_init(void) +{ + return misc_register(&chsc_misc_device); +} + +static void chsc_misc_cleanup(void) +{ + misc_deregister(&chsc_misc_device); +} + +static int __init chsc_sch_init(void) +{ + int ret; + + ret = chsc_init_dbfs(); + if (ret) + return ret; + isc_register(CHSC_SCH_ISC); + ret = chsc_init_sch_driver(); + if (ret) + goto out_dbf; + ret = chsc_misc_init(); + if (ret) + goto out_driver; + return ret; +out_driver: + chsc_cleanup_sch_driver(); +out_dbf: + isc_unregister(CHSC_SCH_ISC); + chsc_remove_dbfs(); + return ret; +} + +static void __exit chsc_sch_exit(void) +{ + chsc_misc_cleanup(); + chsc_cleanup_sch_driver(); + isc_unregister(CHSC_SCH_ISC); + chsc_remove_dbfs(); +} + +module_init(chsc_sch_init); +module_exit(chsc_sch_exit); diff --git a/drivers/s390/cio/chsc_sch.h b/drivers/s390/cio/chsc_sch.h new file mode 100644 index 000000000..ff5328b0b --- /dev/null +++ b/drivers/s390/cio/chsc_sch.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _CHSC_SCH_H +#define _CHSC_SCH_H + +struct chsc_request { + struct completion completion; + struct irb irb; +}; + +struct chsc_private { + struct chsc_request *request; +}; + +#endif diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c new file mode 100644 index 000000000..de744ca15 --- /dev/null +++ b/drivers/s390/cio/cio.c @@ -0,0 +1,762 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * S/390 common I/O routines -- low level i/o calls + * + * Copyright IBM Corp. 1999, 2008 + * Author(s): Ingo Adlung (adlung@de.ibm.com) + * Cornelia Huck (cornelia.huck@de.ibm.com) + * Arnd Bergmann (arndb@de.ibm.com) + * Martin Schwidefsky (schwidefsky@de.ibm.com) + */ + +#define KMSG_COMPONENT "cio" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "cio.h" +#include "css.h" +#include "chsc.h" +#include "ioasm.h" +#include "io_sch.h" +#include "blacklist.h" +#include "cio_debug.h" +#include "chp.h" +#include "trace.h" + +debug_info_t *cio_debug_msg_id; +debug_info_t *cio_debug_trace_id; +debug_info_t *cio_debug_crw_id; + +DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb); +EXPORT_PER_CPU_SYMBOL(cio_irb); + +/* + * Function: cio_debug_init + * Initializes three debug logs for common I/O: + * - cio_msg logs generic cio messages + * - cio_trace logs the calling of different functions + * - cio_crw logs machine check related cio messages + */ +static int __init cio_debug_init(void) +{ + cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long)); + if (!cio_debug_msg_id) + goto out_unregister; + debug_register_view(cio_debug_msg_id, &debug_sprintf_view); + debug_set_level(cio_debug_msg_id, 2); + cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16); + if (!cio_debug_trace_id) + goto out_unregister; + debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view); + debug_set_level(cio_debug_trace_id, 2); + cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long)); + if (!cio_debug_crw_id) + goto out_unregister; + debug_register_view(cio_debug_crw_id, &debug_sprintf_view); + debug_set_level(cio_debug_crw_id, 4); + return 0; + +out_unregister: + debug_unregister(cio_debug_msg_id); + debug_unregister(cio_debug_trace_id); + debug_unregister(cio_debug_crw_id); + return -1; +} + +arch_initcall (cio_debug_init); + +int cio_set_options(struct subchannel *sch, int flags) +{ + struct io_subchannel_private *priv = to_io_private(sch); + + priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0; + priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0; + priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0; + return 0; +} + +static int +cio_start_handle_notoper(struct subchannel *sch, __u8 lpm) +{ + char dbf_text[15]; + + if (lpm != 0) + sch->lpm &= ~lpm; + else + sch->lpm = 0; + + CIO_MSG_EVENT(2, "cio_start: 'not oper' status for " + "subchannel 0.%x.%04x!\n", sch->schid.ssid, + sch->schid.sch_no); + + if (cio_update_schib(sch)) + return -ENODEV; + + sprintf(dbf_text, "no%s", dev_name(&sch->dev)); + CIO_TRACE_EVENT(0, dbf_text); + CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib)); + + return (sch->lpm ? -EACCES : -ENODEV); +} + +int +cio_start_key (struct subchannel *sch, /* subchannel structure */ + struct ccw1 * cpa, /* logical channel prog addr */ + __u8 lpm, /* logical path mask */ + __u8 key) /* storage key */ +{ + struct io_subchannel_private *priv = to_io_private(sch); + union orb *orb = &priv->orb; + int ccode; + + CIO_TRACE_EVENT(5, "stIO"); + CIO_TRACE_EVENT(5, dev_name(&sch->dev)); + + memset(orb, 0, sizeof(union orb)); + /* sch is always under 2G. */ + orb->cmd.intparm = (u32)(addr_t)sch; + orb->cmd.fmt = 1; + + orb->cmd.pfch = priv->options.prefetch == 0; + orb->cmd.spnd = priv->options.suspend; + orb->cmd.ssic = priv->options.suspend && priv->options.inter; + orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm; + /* + * for 64 bit we always support 64 bit IDAWs with 4k page size only + */ + orb->cmd.c64 = 1; + orb->cmd.i2k = 0; + orb->cmd.key = key >> 4; + /* issue "Start Subchannel" */ + orb->cmd.cpa = (__u32) __pa(cpa); + ccode = ssch(sch->schid, orb); + + /* process condition code */ + CIO_HEX_EVENT(5, &ccode, sizeof(ccode)); + + switch (ccode) { + case 0: + /* + * initialize device status information + */ + sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; + return 0; + case 1: /* status pending */ + case 2: /* busy */ + return -EBUSY; + case 3: /* device/path not operational */ + return cio_start_handle_notoper(sch, lpm); + default: + return ccode; + } +} +EXPORT_SYMBOL_GPL(cio_start_key); + +int +cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm) +{ + return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY); +} +EXPORT_SYMBOL_GPL(cio_start); + +/* + * resume suspended I/O operation + */ +int +cio_resume (struct subchannel *sch) +{ + int ccode; + + CIO_TRACE_EVENT(4, "resIO"); + CIO_TRACE_EVENT(4, dev_name(&sch->dev)); + + ccode = rsch (sch->schid); + + CIO_HEX_EVENT(4, &ccode, sizeof(ccode)); + + switch (ccode) { + case 0: + sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND; + return 0; + case 1: + return -EBUSY; + case 2: + return -EINVAL; + default: + /* + * useless to wait for request completion + * as device is no longer operational ! + */ + return -ENODEV; + } +} +EXPORT_SYMBOL_GPL(cio_resume); + +/* + * halt I/O operation + */ +int +cio_halt(struct subchannel *sch) +{ + int ccode; + + if (!sch) + return -ENODEV; + + CIO_TRACE_EVENT(2, "haltIO"); + CIO_TRACE_EVENT(2, dev_name(&sch->dev)); + + /* + * Issue "Halt subchannel" and process condition code + */ + ccode = hsch (sch->schid); + + CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); + + switch (ccode) { + case 0: + sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND; + return 0; + case 1: /* status pending */ + case 2: /* busy */ + return -EBUSY; + default: /* device not operational */ + return -ENODEV; + } +} +EXPORT_SYMBOL_GPL(cio_halt); + +/* + * Clear I/O operation + */ +int +cio_clear(struct subchannel *sch) +{ + int ccode; + + if (!sch) + return -ENODEV; + + CIO_TRACE_EVENT(2, "clearIO"); + CIO_TRACE_EVENT(2, dev_name(&sch->dev)); + + /* + * Issue "Clear subchannel" and process condition code + */ + ccode = csch (sch->schid); + + CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); + + switch (ccode) { + case 0: + sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND; + return 0; + default: /* device not operational */ + return -ENODEV; + } +} +EXPORT_SYMBOL_GPL(cio_clear); + +/* + * Function: cio_cancel + * Issues a "Cancel Subchannel" on the specified subchannel + * Note: We don't need any fancy intparms and flags here + * since xsch is executed synchronously. + * Only for common I/O internal use as for now. + */ +int +cio_cancel (struct subchannel *sch) +{ + int ccode; + + if (!sch) + return -ENODEV; + + CIO_TRACE_EVENT(2, "cancelIO"); + CIO_TRACE_EVENT(2, dev_name(&sch->dev)); + + ccode = xsch (sch->schid); + + CIO_HEX_EVENT(2, &ccode, sizeof(ccode)); + + switch (ccode) { + case 0: /* success */ + /* Update information in scsw. */ + if (cio_update_schib(sch)) + return -ENODEV; + return 0; + case 1: /* status pending */ + return -EBUSY; + case 2: /* not applicable */ + return -EINVAL; + default: /* not oper */ + return -ENODEV; + } +} +EXPORT_SYMBOL_GPL(cio_cancel); + +/** + * cio_cancel_halt_clear - Cancel running I/O by performing cancel, halt + * and clear ordinally if subchannel is valid. + * @sch: subchannel on which to perform the cancel_halt_clear operation + * @iretry: the number of the times remained to retry the next operation + * + * This should be called repeatedly since halt/clear are asynchronous + * operations. We do one try with cio_cancel, three tries with cio_halt, + * 255 tries with cio_clear. The caller should initialize @iretry with + * the value 255 for its first call to this, and keep using the same + * @iretry in the subsequent calls until it gets a non -EBUSY return. + * + * Returns 0 if device now idle, -ENODEV for device not operational, + * -EBUSY if an interrupt is expected (either from halt/clear or from a + * status pending), and -EIO if out of retries. + */ +int cio_cancel_halt_clear(struct subchannel *sch, int *iretry) +{ + int ret; + + if (cio_update_schib(sch)) + return -ENODEV; + if (!sch->schib.pmcw.ena) + /* Not operational -> done. */ + return 0; + /* Stage 1: cancel io. */ + if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) && + !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { + if (!scsw_is_tm(&sch->schib.scsw)) { + ret = cio_cancel(sch); + if (ret != -EINVAL) + return ret; + } + /* + * Cancel io unsuccessful or not applicable (transport mode). + * Continue with asynchronous instructions. + */ + *iretry = 3; /* 3 halt retries. */ + } + /* Stage 2: halt io. */ + if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { + if (*iretry) { + *iretry -= 1; + ret = cio_halt(sch); + if (ret != -EBUSY) + return (ret == 0) ? -EBUSY : ret; + } + /* Halt io unsuccessful. */ + *iretry = 255; /* 255 clear retries. */ + } + /* Stage 3: clear io. */ + if (*iretry) { + *iretry -= 1; + ret = cio_clear(sch); + return (ret == 0) ? -EBUSY : ret; + } + /* Function was unsuccessful */ + return -EIO; +} +EXPORT_SYMBOL_GPL(cio_cancel_halt_clear); + +static void cio_apply_config(struct subchannel *sch, struct schib *schib) +{ + schib->pmcw.intparm = sch->config.intparm; + schib->pmcw.mbi = sch->config.mbi; + schib->pmcw.isc = sch->config.isc; + schib->pmcw.ena = sch->config.ena; + schib->pmcw.mme = sch->config.mme; + schib->pmcw.mp = sch->config.mp; + schib->pmcw.csense = sch->config.csense; + schib->pmcw.mbfc = sch->config.mbfc; + if (sch->config.mbfc) + schib->mba = sch->config.mba; +} + +static int cio_check_config(struct subchannel *sch, struct schib *schib) +{ + return (schib->pmcw.intparm == sch->config.intparm) && + (schib->pmcw.mbi == sch->config.mbi) && + (schib->pmcw.isc == sch->config.isc) && + (schib->pmcw.ena == sch->config.ena) && + (schib->pmcw.mme == sch->config.mme) && + (schib->pmcw.mp == sch->config.mp) && + (schib->pmcw.csense == sch->config.csense) && + (schib->pmcw.mbfc == sch->config.mbfc) && + (!sch->config.mbfc || (schib->mba == sch->config.mba)); +} + +/* + * cio_commit_config - apply configuration to the subchannel + */ +int cio_commit_config(struct subchannel *sch) +{ + int ccode, retry, ret = 0; + struct schib schib; + struct irb irb; + + if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) + return -ENODEV; + + for (retry = 0; retry < 5; retry++) { + /* copy desired changes to local schib */ + cio_apply_config(sch, &schib); + ccode = msch(sch->schid, &schib); + if (ccode < 0) /* -EIO if msch gets a program check. */ + return ccode; + switch (ccode) { + case 0: /* successful */ + if (stsch(sch->schid, &schib) || + !css_sch_is_valid(&schib)) + return -ENODEV; + if (cio_check_config(sch, &schib)) { + /* commit changes from local schib */ + memcpy(&sch->schib, &schib, sizeof(schib)); + return 0; + } + ret = -EAGAIN; + break; + case 1: /* status pending */ + ret = -EBUSY; + if (tsch(sch->schid, &irb)) + return ret; + break; + case 2: /* busy */ + udelay(100); /* allow for recovery */ + ret = -EBUSY; + break; + case 3: /* not operational */ + return -ENODEV; + } + } + return ret; +} +EXPORT_SYMBOL_GPL(cio_commit_config); + +/** + * cio_update_schib - Perform stsch and update schib if subchannel is valid. + * @sch: subchannel on which to perform stsch + * Return zero on success, -ENODEV otherwise. + */ +int cio_update_schib(struct subchannel *sch) +{ + struct schib schib; + + if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib)) + return -ENODEV; + + memcpy(&sch->schib, &schib, sizeof(schib)); + return 0; +} +EXPORT_SYMBOL_GPL(cio_update_schib); + +/** + * cio_enable_subchannel - enable a subchannel. + * @sch: subchannel to be enabled + * @intparm: interruption parameter to set + */ +int cio_enable_subchannel(struct subchannel *sch, u32 intparm) +{ + int ret; + + CIO_TRACE_EVENT(2, "ensch"); + CIO_TRACE_EVENT(2, dev_name(&sch->dev)); + + if (sch_is_pseudo_sch(sch)) + return -EINVAL; + if (cio_update_schib(sch)) + return -ENODEV; + + sch->config.ena = 1; + sch->config.isc = sch->isc; + sch->config.intparm = intparm; + + ret = cio_commit_config(sch); + if (ret == -EIO) { + /* + * Got a program check in msch. Try without + * the concurrent sense bit the next time. + */ + sch->config.csense = 0; + ret = cio_commit_config(sch); + } + CIO_HEX_EVENT(2, &ret, sizeof(ret)); + return ret; +} +EXPORT_SYMBOL_GPL(cio_enable_subchannel); + +/** + * cio_disable_subchannel - disable a subchannel. + * @sch: subchannel to disable + */ +int cio_disable_subchannel(struct subchannel *sch) +{ + int ret; + + CIO_TRACE_EVENT(2, "dissch"); + CIO_TRACE_EVENT(2, dev_name(&sch->dev)); + + if (sch_is_pseudo_sch(sch)) + return 0; + if (cio_update_schib(sch)) + return -ENODEV; + + sch->config.ena = 0; + ret = cio_commit_config(sch); + + CIO_HEX_EVENT(2, &ret, sizeof(ret)); + return ret; +} +EXPORT_SYMBOL_GPL(cio_disable_subchannel); + +/* + * do_cio_interrupt() handles all normal I/O device IRQ's + */ +static irqreturn_t do_cio_interrupt(int irq, void *dummy) +{ + struct tpi_info *tpi_info; + struct subchannel *sch; + struct irb *irb; + + set_cpu_flag(CIF_NOHZ_DELAY); + tpi_info = (struct tpi_info *) &get_irq_regs()->int_code; + trace_s390_cio_interrupt(tpi_info); + irb = this_cpu_ptr(&cio_irb); + sch = (struct subchannel *)(unsigned long) tpi_info->intparm; + if (!sch) { + /* Clear pending interrupt condition. */ + inc_irq_stat(IRQIO_CIO); + tsch(tpi_info->schid, irb); + return IRQ_HANDLED; + } + spin_lock(sch->lock); + /* Store interrupt response block to lowcore. */ + if (tsch(tpi_info->schid, irb) == 0) { + /* Keep subchannel information word up to date. */ + memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw)); + /* Call interrupt handler if there is one. */ + if (sch->driver && sch->driver->irq) + sch->driver->irq(sch); + else + inc_irq_stat(IRQIO_CIO); + } else + inc_irq_stat(IRQIO_CIO); + spin_unlock(sch->lock); + + return IRQ_HANDLED; +} + +static struct irqaction io_interrupt = { + .name = "IO", + .handler = do_cio_interrupt, +}; + +void __init init_cio_interrupts(void) +{ + irq_set_chip_and_handler(IO_INTERRUPT, + &dummy_irq_chip, handle_percpu_irq); + setup_irq(IO_INTERRUPT, &io_interrupt); +} + +#ifdef CONFIG_CCW_CONSOLE +static struct subchannel *console_sch; +static struct lock_class_key console_sch_key; + +/* + * Use cio_tsch to update the subchannel status and call the interrupt handler + * if status had been pending. Called with the subchannel's lock held. + */ +void cio_tsch(struct subchannel *sch) +{ + struct irb *irb; + int irq_context; + + irb = this_cpu_ptr(&cio_irb); + /* Store interrupt response block to lowcore. */ + if (tsch(sch->schid, irb) != 0) + /* Not status pending or not operational. */ + return; + memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw)); + /* Call interrupt handler with updated status. */ + irq_context = in_interrupt(); + if (!irq_context) { + local_bh_disable(); + irq_enter(); + } + kstat_incr_irq_this_cpu(IO_INTERRUPT); + if (sch->driver && sch->driver->irq) + sch->driver->irq(sch); + else + inc_irq_stat(IRQIO_CIO); + if (!irq_context) { + irq_exit(); + _local_bh_enable(); + } +} + +static int cio_test_for_console(struct subchannel_id schid, void *data) +{ + struct schib schib; + + if (stsch(schid, &schib) != 0) + return -ENXIO; + if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv && + (schib.pmcw.dev == console_devno)) { + console_irq = schid.sch_no; + return 1; /* found */ + } + return 0; +} + +static int cio_get_console_sch_no(void) +{ + struct subchannel_id schid; + struct schib schib; + + init_subchannel_id(&schid); + if (console_irq != -1) { + /* VM provided us with the irq number of the console. */ + schid.sch_no = console_irq; + if (stsch(schid, &schib) != 0 || + (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv) + return -1; + console_devno = schib.pmcw.dev; + } else if (console_devno != -1) { + /* At least the console device number is known. */ + for_each_subchannel(cio_test_for_console, NULL); + } + return console_irq; +} + +struct subchannel *cio_probe_console(void) +{ + struct subchannel_id schid; + struct subchannel *sch; + struct schib schib; + int sch_no, ret; + + sch_no = cio_get_console_sch_no(); + if (sch_no == -1) { + pr_warn("No CCW console was found\n"); + return ERR_PTR(-ENODEV); + } + init_subchannel_id(&schid); + schid.sch_no = sch_no; + ret = stsch(schid, &schib); + if (ret) + return ERR_PTR(-ENODEV); + + sch = css_alloc_subchannel(schid, &schib); + if (IS_ERR(sch)) + return sch; + + lockdep_set_class(sch->lock, &console_sch_key); + isc_register(CONSOLE_ISC); + sch->config.isc = CONSOLE_ISC; + sch->config.intparm = (u32)(addr_t)sch; + ret = cio_commit_config(sch); + if (ret) { + isc_unregister(CONSOLE_ISC); + put_device(&sch->dev); + return ERR_PTR(ret); + } + console_sch = sch; + return sch; +} + +int cio_is_console(struct subchannel_id schid) +{ + if (!console_sch) + return 0; + return schid_equal(&schid, &console_sch->schid); +} + +void cio_register_early_subchannels(void) +{ + int ret; + + if (!console_sch) + return; + + ret = css_register_subchannel(console_sch); + if (ret) + put_device(&console_sch->dev); +} +#endif /* CONFIG_CCW_CONSOLE */ + +/** + * cio_tm_start_key - perform start function + * @sch: subchannel on which to perform the start function + * @tcw: transport-command word to be started + * @lpm: mask of paths to use + * @key: storage key to use for storage access + * + * Start the tcw on the given subchannel. Return zero on success, non-zero + * otherwise. + */ +int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key) +{ + int cc; + union orb *orb = &to_io_private(sch)->orb; + + memset(orb, 0, sizeof(union orb)); + orb->tm.intparm = (u32) (addr_t) sch; + orb->tm.key = key >> 4; + orb->tm.b = 1; + orb->tm.lpm = lpm ? lpm : sch->lpm; + orb->tm.tcw = (u32) (addr_t) tcw; + cc = ssch(sch->schid, orb); + switch (cc) { + case 0: + return 0; + case 1: + case 2: + return -EBUSY; + default: + return cio_start_handle_notoper(sch, lpm); + } +} +EXPORT_SYMBOL_GPL(cio_tm_start_key); + +/** + * cio_tm_intrg - perform interrogate function + * @sch: subchannel on which to perform the interrogate function + * + * If the specified subchannel is running in transport-mode, perform the + * interrogate function. Return zero on success, non-zero otherwie. + */ +int cio_tm_intrg(struct subchannel *sch) +{ + int cc; + + if (!to_io_private(sch)->orb.tm.b) + return -EINVAL; + cc = xsch(sch->schid); + switch (cc) { + case 0: + case 2: + return 0; + case 1: + return -EBUSY; + default: + return -ENODEV; + } +} +EXPORT_SYMBOL_GPL(cio_tm_intrg); diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h new file mode 100644 index 000000000..92eabbb5f --- /dev/null +++ b/drivers/s390/cio/cio.h @@ -0,0 +1,149 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef S390_CIO_H +#define S390_CIO_H + +#include +#include +#include +#include +#include +#include +#include +#include "chsc.h" + +/* + * path management control word + */ +struct pmcw { + u32 intparm; /* interruption parameter */ + u32 qf : 1; /* qdio facility */ + u32 w : 1; + u32 isc : 3; /* interruption sublass */ + u32 res5 : 3; /* reserved zeros */ + u32 ena : 1; /* enabled */ + u32 lm : 2; /* limit mode */ + u32 mme : 2; /* measurement-mode enable */ + u32 mp : 1; /* multipath mode */ + u32 tf : 1; /* timing facility */ + u32 dnv : 1; /* device number valid */ + u32 dev : 16; /* device number */ + u8 lpm; /* logical path mask */ + u8 pnom; /* path not operational mask */ + u8 lpum; /* last path used mask */ + u8 pim; /* path installed mask */ + u16 mbi; /* measurement-block index */ + u8 pom; /* path operational mask */ + u8 pam; /* path available mask */ + u8 chpid[8]; /* CHPID 0-7 (if available) */ + u32 unused1 : 8; /* reserved zeros */ + u32 st : 3; /* subchannel type */ + u32 unused2 : 18; /* reserved zeros */ + u32 mbfc : 1; /* measurement block format control */ + u32 xmwme : 1; /* extended measurement word mode enable */ + u32 csense : 1; /* concurrent sense; can be enabled ...*/ + /* ... per MSCH, however, if facility */ + /* ... is not installed, this results */ + /* ... in an operand exception. */ +} __attribute__ ((packed)); + +/* I/O-Interruption Code as stored by TEST PENDING INTERRUPTION (TPI). */ +struct tpi_info { + struct subchannel_id schid; + u32 intparm; + u32 adapter_IO:1; + u32 :1; + u32 isc:3; + u32 :27; + u32 type:3; + u32 :12; +} __packed __aligned(4); + +/* Target SCHIB configuration. */ +struct schib_config { + u64 mba; + u32 intparm; + u16 mbi; + u32 isc:3; + u32 ena:1; + u32 mme:2; + u32 mp:1; + u32 csense:1; + u32 mbfc:1; +} __attribute__ ((packed)); + +/* + * subchannel information block + */ +struct schib { + struct pmcw pmcw; /* path management control word */ + union scsw scsw; /* subchannel status word */ + __u64 mba; /* measurement block address */ + __u8 mda[4]; /* model dependent area */ +} __attribute__ ((packed,aligned(4))); + +/* + * When rescheduled, todo's with higher values will overwrite those + * with lower values. + */ +enum sch_todo { + SCH_TODO_NOTHING, + SCH_TODO_EVAL, + SCH_TODO_UNREG, +}; + +/* subchannel data structure used by I/O subroutines */ +struct subchannel { + struct subchannel_id schid; + spinlock_t *lock; /* subchannel lock */ + struct mutex reg_mutex; + enum { + SUBCHANNEL_TYPE_IO = 0, + SUBCHANNEL_TYPE_CHSC = 1, + SUBCHANNEL_TYPE_MSG = 2, + SUBCHANNEL_TYPE_ADM = 3, + } st; /* subchannel type */ + __u8 vpm; /* verified path mask */ + __u8 lpm; /* logical path mask */ + __u8 opm; /* operational path mask */ + struct schib schib; /* subchannel information block */ + int isc; /* desired interruption subclass */ + struct chsc_ssd_info ssd_info; /* subchannel description */ + struct device dev; /* entry in device tree */ + struct css_driver *driver; + enum sch_todo todo; + struct work_struct todo_work; + struct schib_config config; +} __attribute__ ((aligned(8))); + +DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb); + +#define to_subchannel(n) container_of(n, struct subchannel, dev) + +extern int cio_enable_subchannel(struct subchannel *, u32); +extern int cio_disable_subchannel (struct subchannel *); +extern int cio_cancel (struct subchannel *); +extern int cio_clear (struct subchannel *); +extern int cio_cancel_halt_clear(struct subchannel *, int *); +extern int cio_resume (struct subchannel *); +extern int cio_halt (struct subchannel *); +extern int cio_start (struct subchannel *, struct ccw1 *, __u8); +extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8); +extern int cio_set_options (struct subchannel *, int); +extern int cio_update_schib(struct subchannel *sch); +extern int cio_commit_config(struct subchannel *sch); + +int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key); +int cio_tm_intrg(struct subchannel *sch); + +/* Use with care. */ +#ifdef CONFIG_CCW_CONSOLE +extern struct subchannel *cio_probe_console(void); +extern int cio_is_console(struct subchannel_id); +extern void cio_register_early_subchannels(void); +extern void cio_tsch(struct subchannel *sch); +#else +#define cio_is_console(schid) 0 +static inline void cio_register_early_subchannels(void) {} +#endif + +#endif diff --git a/drivers/s390/cio/cio_debug.h b/drivers/s390/cio/cio_debug.h new file mode 100644 index 000000000..7bdbe7370 --- /dev/null +++ b/drivers/s390/cio/cio_debug.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef CIO_DEBUG_H +#define CIO_DEBUG_H + +#include + +/* for use of debug feature */ +extern debug_info_t *cio_debug_msg_id; +extern debug_info_t *cio_debug_trace_id; +extern debug_info_t *cio_debug_crw_id; + +#define CIO_TRACE_EVENT(imp, txt) do { \ + debug_text_event(cio_debug_trace_id, imp, txt); \ + } while (0) + +#define CIO_MSG_EVENT(imp, args...) do { \ + debug_sprintf_event(cio_debug_msg_id, imp , ##args); \ + } while (0) + +#define CIO_CRW_EVENT(imp, args...) do { \ + debug_sprintf_event(cio_debug_crw_id, imp , ##args); \ + } while (0) + +static inline void CIO_HEX_EVENT(int level, void *data, int length) +{ + debug_event(cio_debug_trace_id, level, data, length); +} + +#endif diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c new file mode 100644 index 000000000..8af4948da --- /dev/null +++ b/drivers/s390/cio/cmf.c @@ -0,0 +1,1309 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Linux on zSeries Channel Measurement Facility support + * + * Copyright IBM Corp. 2000, 2006 + * + * Authors: Arnd Bergmann + * Cornelia Huck + * + * original idea from Natarajan Krishnaswami + */ + +#define KMSG_COMPONENT "cio" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include /* get_tod_clock() */ + +#include +#include +#include +#include + +#include "cio.h" +#include "css.h" +#include "device.h" +#include "ioasm.h" +#include "chsc.h" + +/* + * parameter to enable cmf during boot, possible uses are: + * "s390cmf" -- enable cmf and allocate 2 MB of ram so measuring can be + * used on any subchannel + * "s390cmf=" -- enable cmf and allocate enough memory to measure + * subchannel, where is an integer + * between 1 and 65535, default is 1024 + */ +#define ARGSTRING "s390cmf" + +/* indices for READCMB */ +enum cmb_index { + avg_utilization = -1, + /* basic and exended format: */ + cmb_ssch_rsch_count = 0, + cmb_sample_count, + cmb_device_connect_time, + cmb_function_pending_time, + cmb_device_disconnect_time, + cmb_control_unit_queuing_time, + cmb_device_active_only_time, + /* extended format only: */ + cmb_device_busy_time, + cmb_initial_command_response_time, +}; + +/** + * enum cmb_format - types of supported measurement block formats + * + * @CMF_BASIC: traditional channel measurement blocks supported + * by all machines that we run on + * @CMF_EXTENDED: improved format that was introduced with the z990 + * machine + * @CMF_AUTODETECT: default: use extended format when running on a machine + * supporting extended format, otherwise fall back to + * basic format + */ +enum cmb_format { + CMF_BASIC, + CMF_EXTENDED, + CMF_AUTODETECT = -1, +}; + +/* + * format - actual format for all measurement blocks + * + * The format module parameter can be set to a value of 0 (zero) + * or 1, indicating basic or extended format as described for + * enum cmb_format. + */ +static int format = CMF_AUTODETECT; +module_param(format, bint, 0444); + +/** + * struct cmb_operations - functions to use depending on cmb_format + * + * Most of these functions operate on a struct ccw_device. There is only + * one instance of struct cmb_operations because the format of the measurement + * data is guaranteed to be the same for every ccw_device. + * + * @alloc: allocate memory for a channel measurement block, + * either with the help of a special pool or with kmalloc + * @free: free memory allocated with @alloc + * @set: enable or disable measurement + * @read: read a measurement entry at an index + * @readall: read a measurement block in a common format + * @reset: clear the data in the associated measurement block and + * reset its time stamp + */ +struct cmb_operations { + int (*alloc) (struct ccw_device *); + void (*free) (struct ccw_device *); + int (*set) (struct ccw_device *, u32); + u64 (*read) (struct ccw_device *, int); + int (*readall)(struct ccw_device *, struct cmbdata *); + void (*reset) (struct ccw_device *); +/* private: */ + struct attribute_group *attr_group; +}; +static struct cmb_operations *cmbops; + +struct cmb_data { + void *hw_block; /* Pointer to block updated by hardware */ + void *last_block; /* Last changed block copied from hardware block */ + int size; /* Size of hw_block and last_block */ + unsigned long long last_update; /* when last_block was updated */ +}; + +/* + * Our user interface is designed in terms of nanoseconds, + * while the hardware measures total times in its own + * unit. + */ +static inline u64 time_to_nsec(u32 value) +{ + return ((u64)value) * 128000ull; +} + +/* + * Users are usually interested in average times, + * not accumulated time. + * This also helps us with atomicity problems + * when reading sinlge values. + */ +static inline u64 time_to_avg_nsec(u32 value, u32 count) +{ + u64 ret; + + /* no samples yet, avoid division by 0 */ + if (count == 0) + return 0; + + /* value comes in units of 128 µsec */ + ret = time_to_nsec(value); + do_div(ret, count); + + return ret; +} + +#define CMF_OFF 0 +#define CMF_ON 2 + +/* + * Activate or deactivate the channel monitor. When area is NULL, + * the monitor is deactivated. The channel monitor needs to + * be active in order to measure subchannels, which also need + * to be enabled. + */ +static inline void cmf_activate(void *area, unsigned int onoff) +{ + register void * __gpr2 asm("2"); + register long __gpr1 asm("1"); + + __gpr2 = area; + __gpr1 = onoff; + /* activate channel measurement */ + asm("schm" : : "d" (__gpr2), "d" (__gpr1) ); +} + +static int set_schib(struct ccw_device *cdev, u32 mme, int mbfc, + unsigned long address) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + int ret; + + sch->config.mme = mme; + sch->config.mbfc = mbfc; + /* address can be either a block address or a block index */ + if (mbfc) + sch->config.mba = address; + else + sch->config.mbi = address; + + ret = cio_commit_config(sch); + if (!mme && ret == -ENODEV) { + /* + * The task was to disable measurement block updates but + * the subchannel is already gone. Report success. + */ + ret = 0; + } + return ret; +} + +struct set_schib_struct { + u32 mme; + int mbfc; + unsigned long address; + wait_queue_head_t wait; + int ret; +}; + +#define CMF_PENDING 1 +#define SET_SCHIB_TIMEOUT (10 * HZ) + +static int set_schib_wait(struct ccw_device *cdev, u32 mme, + int mbfc, unsigned long address) +{ + struct set_schib_struct set_data; + int ret = -ENODEV; + + spin_lock_irq(cdev->ccwlock); + if (!cdev->private->cmb) + goto out; + + ret = set_schib(cdev, mme, mbfc, address); + if (ret != -EBUSY) + goto out; + + /* if the device is not online, don't even try again */ + if (cdev->private->state != DEV_STATE_ONLINE) + goto out; + + init_waitqueue_head(&set_data.wait); + set_data.mme = mme; + set_data.mbfc = mbfc; + set_data.address = address; + set_data.ret = CMF_PENDING; + + cdev->private->state = DEV_STATE_CMFCHANGE; + cdev->private->cmb_wait = &set_data; + spin_unlock_irq(cdev->ccwlock); + + ret = wait_event_interruptible_timeout(set_data.wait, + set_data.ret != CMF_PENDING, + SET_SCHIB_TIMEOUT); + spin_lock_irq(cdev->ccwlock); + if (ret <= 0) { + if (set_data.ret == CMF_PENDING) { + set_data.ret = (ret == 0) ? -ETIME : ret; + if (cdev->private->state == DEV_STATE_CMFCHANGE) + cdev->private->state = DEV_STATE_ONLINE; + } + } + cdev->private->cmb_wait = NULL; + ret = set_data.ret; +out: + spin_unlock_irq(cdev->ccwlock); + return ret; +} + +void retry_set_schib(struct ccw_device *cdev) +{ + struct set_schib_struct *set_data = cdev->private->cmb_wait; + + if (!set_data) + return; + + set_data->ret = set_schib(cdev, set_data->mme, set_data->mbfc, + set_data->address); + wake_up(&set_data->wait); +} + +static int cmf_copy_block(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct cmb_data *cmb_data; + void *hw_block; + + if (cio_update_schib(sch)) + return -ENODEV; + + if (scsw_fctl(&sch->schib.scsw) & SCSW_FCTL_START_FUNC) { + /* Don't copy if a start function is in progress. */ + if ((!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_SUSPENDED)) && + (scsw_actl(&sch->schib.scsw) & + (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) && + (!(scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_SEC_STATUS))) + return -EBUSY; + } + cmb_data = cdev->private->cmb; + hw_block = cmb_data->hw_block; + memcpy(cmb_data->last_block, hw_block, cmb_data->size); + cmb_data->last_update = get_tod_clock(); + return 0; +} + +struct copy_block_struct { + wait_queue_head_t wait; + int ret; +}; + +static int cmf_cmb_copy_wait(struct ccw_device *cdev) +{ + struct copy_block_struct copy_block; + int ret = -ENODEV; + + spin_lock_irq(cdev->ccwlock); + if (!cdev->private->cmb) + goto out; + + ret = cmf_copy_block(cdev); + if (ret != -EBUSY) + goto out; + + if (cdev->private->state != DEV_STATE_ONLINE) + goto out; + + init_waitqueue_head(©_block.wait); + copy_block.ret = CMF_PENDING; + + cdev->private->state = DEV_STATE_CMFUPDATE; + cdev->private->cmb_wait = ©_block; + spin_unlock_irq(cdev->ccwlock); + + ret = wait_event_interruptible(copy_block.wait, + copy_block.ret != CMF_PENDING); + spin_lock_irq(cdev->ccwlock); + if (ret) { + if (copy_block.ret == CMF_PENDING) { + copy_block.ret = -ERESTARTSYS; + if (cdev->private->state == DEV_STATE_CMFUPDATE) + cdev->private->state = DEV_STATE_ONLINE; + } + } + cdev->private->cmb_wait = NULL; + ret = copy_block.ret; +out: + spin_unlock_irq(cdev->ccwlock); + return ret; +} + +void cmf_retry_copy_block(struct ccw_device *cdev) +{ + struct copy_block_struct *copy_block = cdev->private->cmb_wait; + + if (!copy_block) + return; + + copy_block->ret = cmf_copy_block(cdev); + wake_up(©_block->wait); +} + +static void cmf_generic_reset(struct ccw_device *cdev) +{ + struct cmb_data *cmb_data; + + spin_lock_irq(cdev->ccwlock); + cmb_data = cdev->private->cmb; + if (cmb_data) { + memset(cmb_data->last_block, 0, cmb_data->size); + /* + * Need to reset hw block as well to make the hardware start + * from 0 again. + */ + memset(cmb_data->hw_block, 0, cmb_data->size); + cmb_data->last_update = 0; + } + cdev->private->cmb_start_time = get_tod_clock(); + spin_unlock_irq(cdev->ccwlock); +} + +/** + * struct cmb_area - container for global cmb data + * + * @mem: pointer to CMBs (only in basic measurement mode) + * @list: contains a linked list of all subchannels + * @num_channels: number of channels to be measured + * @lock: protect concurrent access to @mem and @list + */ +struct cmb_area { + struct cmb *mem; + struct list_head list; + int num_channels; + spinlock_t lock; +}; + +static struct cmb_area cmb_area = { + .lock = __SPIN_LOCK_UNLOCKED(cmb_area.lock), + .list = LIST_HEAD_INIT(cmb_area.list), + .num_channels = 1024, +}; + +/* ****** old style CMB handling ********/ + +/* + * Basic channel measurement blocks are allocated in one contiguous + * block of memory, which can not be moved as long as any channel + * is active. Therefore, a maximum number of subchannels needs to + * be defined somewhere. This is a module parameter, defaulting to + * a reasonable value of 1024, or 32 kb of memory. + * Current kernels don't allow kmalloc with more than 128kb, so the + * maximum is 4096. + */ + +module_param_named(maxchannels, cmb_area.num_channels, uint, 0444); + +/** + * struct cmb - basic channel measurement block + * @ssch_rsch_count: number of ssch and rsch + * @sample_count: number of samples + * @device_connect_time: time of device connect + * @function_pending_time: time of function pending + * @device_disconnect_time: time of device disconnect + * @control_unit_queuing_time: time of control unit queuing + * @device_active_only_time: time of device active only + * @reserved: unused in basic measurement mode + * + * The measurement block as used by the hardware. The fields are described + * further in z/Architecture Principles of Operation, chapter 17. + * + * The cmb area made up from these blocks must be a contiguous array and may + * not be reallocated or freed. + * Only one cmb area can be present in the system. + */ +struct cmb { + u16 ssch_rsch_count; + u16 sample_count; + u32 device_connect_time; + u32 function_pending_time; + u32 device_disconnect_time; + u32 control_unit_queuing_time; + u32 device_active_only_time; + u32 reserved[2]; +}; + +/* + * Insert a single device into the cmb_area list. + * Called with cmb_area.lock held from alloc_cmb. + */ +static int alloc_cmb_single(struct ccw_device *cdev, + struct cmb_data *cmb_data) +{ + struct cmb *cmb; + struct ccw_device_private *node; + int ret; + + spin_lock_irq(cdev->ccwlock); + if (!list_empty(&cdev->private->cmb_list)) { + ret = -EBUSY; + goto out; + } + + /* + * Find first unused cmb in cmb_area.mem. + * This is a little tricky: cmb_area.list + * remains sorted by ->cmb->hw_data pointers. + */ + cmb = cmb_area.mem; + list_for_each_entry(node, &cmb_area.list, cmb_list) { + struct cmb_data *data; + data = node->cmb; + if ((struct cmb*)data->hw_block > cmb) + break; + cmb++; + } + if (cmb - cmb_area.mem >= cmb_area.num_channels) { + ret = -ENOMEM; + goto out; + } + + /* insert new cmb */ + list_add_tail(&cdev->private->cmb_list, &node->cmb_list); + cmb_data->hw_block = cmb; + cdev->private->cmb = cmb_data; + ret = 0; +out: + spin_unlock_irq(cdev->ccwlock); + return ret; +} + +static int alloc_cmb(struct ccw_device *cdev) +{ + int ret; + struct cmb *mem; + ssize_t size; + struct cmb_data *cmb_data; + + /* Allocate private cmb_data. */ + cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL); + if (!cmb_data) + return -ENOMEM; + + cmb_data->last_block = kzalloc(sizeof(struct cmb), GFP_KERNEL); + if (!cmb_data->last_block) { + kfree(cmb_data); + return -ENOMEM; + } + cmb_data->size = sizeof(struct cmb); + spin_lock(&cmb_area.lock); + + if (!cmb_area.mem) { + /* there is no user yet, so we need a new area */ + size = sizeof(struct cmb) * cmb_area.num_channels; + WARN_ON(!list_empty(&cmb_area.list)); + + spin_unlock(&cmb_area.lock); + mem = (void*)__get_free_pages(GFP_KERNEL | GFP_DMA, + get_order(size)); + spin_lock(&cmb_area.lock); + + if (cmb_area.mem) { + /* ok, another thread was faster */ + free_pages((unsigned long)mem, get_order(size)); + } else if (!mem) { + /* no luck */ + ret = -ENOMEM; + goto out; + } else { + /* everything ok */ + memset(mem, 0, size); + cmb_area.mem = mem; + cmf_activate(cmb_area.mem, CMF_ON); + } + } + + /* do the actual allocation */ + ret = alloc_cmb_single(cdev, cmb_data); +out: + spin_unlock(&cmb_area.lock); + if (ret) { + kfree(cmb_data->last_block); + kfree(cmb_data); + } + return ret; +} + +static void free_cmb(struct ccw_device *cdev) +{ + struct ccw_device_private *priv; + struct cmb_data *cmb_data; + + spin_lock(&cmb_area.lock); + spin_lock_irq(cdev->ccwlock); + + priv = cdev->private; + cmb_data = priv->cmb; + priv->cmb = NULL; + if (cmb_data) + kfree(cmb_data->last_block); + kfree(cmb_data); + list_del_init(&priv->cmb_list); + + if (list_empty(&cmb_area.list)) { + ssize_t size; + size = sizeof(struct cmb) * cmb_area.num_channels; + cmf_activate(NULL, CMF_OFF); + free_pages((unsigned long)cmb_area.mem, get_order(size)); + cmb_area.mem = NULL; + } + spin_unlock_irq(cdev->ccwlock); + spin_unlock(&cmb_area.lock); +} + +static int set_cmb(struct ccw_device *cdev, u32 mme) +{ + u16 offset; + struct cmb_data *cmb_data; + unsigned long flags; + + spin_lock_irqsave(cdev->ccwlock, flags); + if (!cdev->private->cmb) { + spin_unlock_irqrestore(cdev->ccwlock, flags); + return -EINVAL; + } + cmb_data = cdev->private->cmb; + offset = mme ? (struct cmb *)cmb_data->hw_block - cmb_area.mem : 0; + spin_unlock_irqrestore(cdev->ccwlock, flags); + + return set_schib_wait(cdev, mme, 0, offset); +} + +/* calculate utilization in 0.1 percent units */ +static u64 __cmb_utilization(u64 device_connect_time, u64 function_pending_time, + u64 device_disconnect_time, u64 start_time) +{ + u64 utilization, elapsed_time; + + utilization = time_to_nsec(device_connect_time + + function_pending_time + + device_disconnect_time); + + elapsed_time = get_tod_clock() - start_time; + elapsed_time = tod_to_ns(elapsed_time); + elapsed_time /= 1000; + + return elapsed_time ? (utilization / elapsed_time) : 0; +} + +static u64 read_cmb(struct ccw_device *cdev, int index) +{ + struct cmb_data *cmb_data; + unsigned long flags; + struct cmb *cmb; + u64 ret = 0; + u32 val; + + spin_lock_irqsave(cdev->ccwlock, flags); + cmb_data = cdev->private->cmb; + if (!cmb_data) + goto out; + + cmb = cmb_data->hw_block; + switch (index) { + case avg_utilization: + ret = __cmb_utilization(cmb->device_connect_time, + cmb->function_pending_time, + cmb->device_disconnect_time, + cdev->private->cmb_start_time); + goto out; + case cmb_ssch_rsch_count: + ret = cmb->ssch_rsch_count; + goto out; + case cmb_sample_count: + ret = cmb->sample_count; + goto out; + case cmb_device_connect_time: + val = cmb->device_connect_time; + break; + case cmb_function_pending_time: + val = cmb->function_pending_time; + break; + case cmb_device_disconnect_time: + val = cmb->device_disconnect_time; + break; + case cmb_control_unit_queuing_time: + val = cmb->control_unit_queuing_time; + break; + case cmb_device_active_only_time: + val = cmb->device_active_only_time; + break; + default: + goto out; + } + ret = time_to_avg_nsec(val, cmb->sample_count); +out: + spin_unlock_irqrestore(cdev->ccwlock, flags); + return ret; +} + +static int readall_cmb(struct ccw_device *cdev, struct cmbdata *data) +{ + struct cmb *cmb; + struct cmb_data *cmb_data; + u64 time; + unsigned long flags; + int ret; + + ret = cmf_cmb_copy_wait(cdev); + if (ret < 0) + return ret; + spin_lock_irqsave(cdev->ccwlock, flags); + cmb_data = cdev->private->cmb; + if (!cmb_data) { + ret = -ENODEV; + goto out; + } + if (cmb_data->last_update == 0) { + ret = -EAGAIN; + goto out; + } + cmb = cmb_data->last_block; + time = cmb_data->last_update - cdev->private->cmb_start_time; + + memset(data, 0, sizeof(struct cmbdata)); + + /* we only know values before device_busy_time */ + data->size = offsetof(struct cmbdata, device_busy_time); + + data->elapsed_time = tod_to_ns(time); + + /* copy data to new structure */ + data->ssch_rsch_count = cmb->ssch_rsch_count; + data->sample_count = cmb->sample_count; + + /* time fields are converted to nanoseconds while copying */ + data->device_connect_time = time_to_nsec(cmb->device_connect_time); + data->function_pending_time = time_to_nsec(cmb->function_pending_time); + data->device_disconnect_time = + time_to_nsec(cmb->device_disconnect_time); + data->control_unit_queuing_time + = time_to_nsec(cmb->control_unit_queuing_time); + data->device_active_only_time + = time_to_nsec(cmb->device_active_only_time); + ret = 0; +out: + spin_unlock_irqrestore(cdev->ccwlock, flags); + return ret; +} + +static void reset_cmb(struct ccw_device *cdev) +{ + cmf_generic_reset(cdev); +} + +static int cmf_enabled(struct ccw_device *cdev) +{ + int enabled; + + spin_lock_irq(cdev->ccwlock); + enabled = !!cdev->private->cmb; + spin_unlock_irq(cdev->ccwlock); + + return enabled; +} + +static struct attribute_group cmf_attr_group; + +static struct cmb_operations cmbops_basic = { + .alloc = alloc_cmb, + .free = free_cmb, + .set = set_cmb, + .read = read_cmb, + .readall = readall_cmb, + .reset = reset_cmb, + .attr_group = &cmf_attr_group, +}; + +/* ******** extended cmb handling ********/ + +/** + * struct cmbe - extended channel measurement block + * @ssch_rsch_count: number of ssch and rsch + * @sample_count: number of samples + * @device_connect_time: time of device connect + * @function_pending_time: time of function pending + * @device_disconnect_time: time of device disconnect + * @control_unit_queuing_time: time of control unit queuing + * @device_active_only_time: time of device active only + * @device_busy_time: time of device busy + * @initial_command_response_time: initial command response time + * @reserved: unused + * + * The measurement block as used by the hardware. May be in any 64 bit physical + * location. + * The fields are described further in z/Architecture Principles of Operation, + * third edition, chapter 17. + */ +struct cmbe { + u32 ssch_rsch_count; + u32 sample_count; + u32 device_connect_time; + u32 function_pending_time; + u32 device_disconnect_time; + u32 control_unit_queuing_time; + u32 device_active_only_time; + u32 device_busy_time; + u32 initial_command_response_time; + u32 reserved[7]; +} __packed __aligned(64); + +static struct kmem_cache *cmbe_cache; + +static int alloc_cmbe(struct ccw_device *cdev) +{ + struct cmb_data *cmb_data; + struct cmbe *cmbe; + int ret = -ENOMEM; + + cmbe = kmem_cache_zalloc(cmbe_cache, GFP_KERNEL); + if (!cmbe) + return ret; + + cmb_data = kzalloc(sizeof(*cmb_data), GFP_KERNEL); + if (!cmb_data) + goto out_free; + + cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL); + if (!cmb_data->last_block) + goto out_free; + + cmb_data->size = sizeof(*cmbe); + cmb_data->hw_block = cmbe; + + spin_lock(&cmb_area.lock); + spin_lock_irq(cdev->ccwlock); + if (cdev->private->cmb) + goto out_unlock; + + cdev->private->cmb = cmb_data; + + /* activate global measurement if this is the first channel */ + if (list_empty(&cmb_area.list)) + cmf_activate(NULL, CMF_ON); + list_add_tail(&cdev->private->cmb_list, &cmb_area.list); + + spin_unlock_irq(cdev->ccwlock); + spin_unlock(&cmb_area.lock); + return 0; + +out_unlock: + spin_unlock_irq(cdev->ccwlock); + spin_unlock(&cmb_area.lock); + ret = -EBUSY; +out_free: + if (cmb_data) + kfree(cmb_data->last_block); + kfree(cmb_data); + kmem_cache_free(cmbe_cache, cmbe); + + return ret; +} + +static void free_cmbe(struct ccw_device *cdev) +{ + struct cmb_data *cmb_data; + + spin_lock(&cmb_area.lock); + spin_lock_irq(cdev->ccwlock); + cmb_data = cdev->private->cmb; + cdev->private->cmb = NULL; + if (cmb_data) { + kfree(cmb_data->last_block); + kmem_cache_free(cmbe_cache, cmb_data->hw_block); + } + kfree(cmb_data); + + /* deactivate global measurement if this is the last channel */ + list_del_init(&cdev->private->cmb_list); + if (list_empty(&cmb_area.list)) + cmf_activate(NULL, CMF_OFF); + spin_unlock_irq(cdev->ccwlock); + spin_unlock(&cmb_area.lock); +} + +static int set_cmbe(struct ccw_device *cdev, u32 mme) +{ + unsigned long mba; + struct cmb_data *cmb_data; + unsigned long flags; + + spin_lock_irqsave(cdev->ccwlock, flags); + if (!cdev->private->cmb) { + spin_unlock_irqrestore(cdev->ccwlock, flags); + return -EINVAL; + } + cmb_data = cdev->private->cmb; + mba = mme ? (unsigned long) cmb_data->hw_block : 0; + spin_unlock_irqrestore(cdev->ccwlock, flags); + + return set_schib_wait(cdev, mme, 1, mba); +} + +static u64 read_cmbe(struct ccw_device *cdev, int index) +{ + struct cmb_data *cmb_data; + unsigned long flags; + struct cmbe *cmb; + u64 ret = 0; + u32 val; + + spin_lock_irqsave(cdev->ccwlock, flags); + cmb_data = cdev->private->cmb; + if (!cmb_data) + goto out; + + cmb = cmb_data->hw_block; + switch (index) { + case avg_utilization: + ret = __cmb_utilization(cmb->device_connect_time, + cmb->function_pending_time, + cmb->device_disconnect_time, + cdev->private->cmb_start_time); + goto out; + case cmb_ssch_rsch_count: + ret = cmb->ssch_rsch_count; + goto out; + case cmb_sample_count: + ret = cmb->sample_count; + goto out; + case cmb_device_connect_time: + val = cmb->device_connect_time; + break; + case cmb_function_pending_time: + val = cmb->function_pending_time; + break; + case cmb_device_disconnect_time: + val = cmb->device_disconnect_time; + break; + case cmb_control_unit_queuing_time: + val = cmb->control_unit_queuing_time; + break; + case cmb_device_active_only_time: + val = cmb->device_active_only_time; + break; + case cmb_device_busy_time: + val = cmb->device_busy_time; + break; + case cmb_initial_command_response_time: + val = cmb->initial_command_response_time; + break; + default: + goto out; + } + ret = time_to_avg_nsec(val, cmb->sample_count); +out: + spin_unlock_irqrestore(cdev->ccwlock, flags); + return ret; +} + +static int readall_cmbe(struct ccw_device *cdev, struct cmbdata *data) +{ + struct cmbe *cmb; + struct cmb_data *cmb_data; + u64 time; + unsigned long flags; + int ret; + + ret = cmf_cmb_copy_wait(cdev); + if (ret < 0) + return ret; + spin_lock_irqsave(cdev->ccwlock, flags); + cmb_data = cdev->private->cmb; + if (!cmb_data) { + ret = -ENODEV; + goto out; + } + if (cmb_data->last_update == 0) { + ret = -EAGAIN; + goto out; + } + time = cmb_data->last_update - cdev->private->cmb_start_time; + + memset (data, 0, sizeof(struct cmbdata)); + + /* we only know values before device_busy_time */ + data->size = offsetof(struct cmbdata, device_busy_time); + + data->elapsed_time = tod_to_ns(time); + + cmb = cmb_data->last_block; + /* copy data to new structure */ + data->ssch_rsch_count = cmb->ssch_rsch_count; + data->sample_count = cmb->sample_count; + + /* time fields are converted to nanoseconds while copying */ + data->device_connect_time = time_to_nsec(cmb->device_connect_time); + data->function_pending_time = time_to_nsec(cmb->function_pending_time); + data->device_disconnect_time = + time_to_nsec(cmb->device_disconnect_time); + data->control_unit_queuing_time + = time_to_nsec(cmb->control_unit_queuing_time); + data->device_active_only_time + = time_to_nsec(cmb->device_active_only_time); + data->device_busy_time = time_to_nsec(cmb->device_busy_time); + data->initial_command_response_time + = time_to_nsec(cmb->initial_command_response_time); + + ret = 0; +out: + spin_unlock_irqrestore(cdev->ccwlock, flags); + return ret; +} + +static void reset_cmbe(struct ccw_device *cdev) +{ + cmf_generic_reset(cdev); +} + +static struct attribute_group cmf_attr_group_ext; + +static struct cmb_operations cmbops_extended = { + .alloc = alloc_cmbe, + .free = free_cmbe, + .set = set_cmbe, + .read = read_cmbe, + .readall = readall_cmbe, + .reset = reset_cmbe, + .attr_group = &cmf_attr_group_ext, +}; + +static ssize_t cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx) +{ + return sprintf(buf, "%lld\n", + (unsigned long long) cmf_read(to_ccwdev(dev), idx)); +} + +static ssize_t cmb_show_avg_sample_interval(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ccw_device *cdev = to_ccwdev(dev); + unsigned long count; + long interval; + + count = cmf_read(cdev, cmb_sample_count); + spin_lock_irq(cdev->ccwlock); + if (count) { + interval = get_tod_clock() - cdev->private->cmb_start_time; + interval = tod_to_ns(interval); + interval /= count; + } else + interval = -1; + spin_unlock_irq(cdev->ccwlock); + return sprintf(buf, "%ld\n", interval); +} + +static ssize_t cmb_show_avg_utilization(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + unsigned long u = cmf_read(to_ccwdev(dev), avg_utilization); + + return sprintf(buf, "%02lu.%01lu%%\n", u / 10, u % 10); +} + +#define cmf_attr(name) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ return cmb_show_attr((dev), buf, cmb_##name); } \ +static DEVICE_ATTR(name, 0444, show_##name, NULL); + +#define cmf_attr_avg(name) \ +static ssize_t show_avg_##name(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ return cmb_show_attr((dev), buf, cmb_##name); } \ +static DEVICE_ATTR(avg_##name, 0444, show_avg_##name, NULL); + +cmf_attr(ssch_rsch_count); +cmf_attr(sample_count); +cmf_attr_avg(device_connect_time); +cmf_attr_avg(function_pending_time); +cmf_attr_avg(device_disconnect_time); +cmf_attr_avg(control_unit_queuing_time); +cmf_attr_avg(device_active_only_time); +cmf_attr_avg(device_busy_time); +cmf_attr_avg(initial_command_response_time); + +static DEVICE_ATTR(avg_sample_interval, 0444, cmb_show_avg_sample_interval, + NULL); +static DEVICE_ATTR(avg_utilization, 0444, cmb_show_avg_utilization, NULL); + +static struct attribute *cmf_attributes[] = { + &dev_attr_avg_sample_interval.attr, + &dev_attr_avg_utilization.attr, + &dev_attr_ssch_rsch_count.attr, + &dev_attr_sample_count.attr, + &dev_attr_avg_device_connect_time.attr, + &dev_attr_avg_function_pending_time.attr, + &dev_attr_avg_device_disconnect_time.attr, + &dev_attr_avg_control_unit_queuing_time.attr, + &dev_attr_avg_device_active_only_time.attr, + NULL, +}; + +static struct attribute_group cmf_attr_group = { + .name = "cmf", + .attrs = cmf_attributes, +}; + +static struct attribute *cmf_attributes_ext[] = { + &dev_attr_avg_sample_interval.attr, + &dev_attr_avg_utilization.attr, + &dev_attr_ssch_rsch_count.attr, + &dev_attr_sample_count.attr, + &dev_attr_avg_device_connect_time.attr, + &dev_attr_avg_function_pending_time.attr, + &dev_attr_avg_device_disconnect_time.attr, + &dev_attr_avg_control_unit_queuing_time.attr, + &dev_attr_avg_device_active_only_time.attr, + &dev_attr_avg_device_busy_time.attr, + &dev_attr_avg_initial_command_response_time.attr, + NULL, +}; + +static struct attribute_group cmf_attr_group_ext = { + .name = "cmf", + .attrs = cmf_attributes_ext, +}; + +static ssize_t cmb_enable_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ccw_device *cdev = to_ccwdev(dev); + + return sprintf(buf, "%d\n", cmf_enabled(cdev)); +} + +static ssize_t cmb_enable_store(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t c) +{ + struct ccw_device *cdev = to_ccwdev(dev); + unsigned long val; + int ret; + + ret = kstrtoul(buf, 16, &val); + if (ret) + return ret; + + switch (val) { + case 0: + ret = disable_cmf(cdev); + break; + case 1: + ret = enable_cmf(cdev); + break; + default: + ret = -EINVAL; + } + + return ret ? ret : c; +} +DEVICE_ATTR_RW(cmb_enable); + +int ccw_set_cmf(struct ccw_device *cdev, int enable) +{ + return cmbops->set(cdev, enable ? 2 : 0); +} + +/** + * enable_cmf() - switch on the channel measurement for a specific device + * @cdev: The ccw device to be enabled + * + * Enable channel measurements for @cdev. If this is called on a device + * for which channel measurement is already enabled a reset of the + * measurement data is triggered. + * Returns: %0 for success or a negative error value. + * Context: + * non-atomic + */ +int enable_cmf(struct ccw_device *cdev) +{ + int ret = 0; + + device_lock(&cdev->dev); + if (cmf_enabled(cdev)) { + cmbops->reset(cdev); + goto out_unlock; + } + get_device(&cdev->dev); + ret = cmbops->alloc(cdev); + if (ret) + goto out; + cmbops->reset(cdev); + ret = sysfs_create_group(&cdev->dev.kobj, cmbops->attr_group); + if (ret) { + cmbops->free(cdev); + goto out; + } + ret = cmbops->set(cdev, 2); + if (ret) { + sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group); + cmbops->free(cdev); + } +out: + if (ret) + put_device(&cdev->dev); +out_unlock: + device_unlock(&cdev->dev); + return ret; +} + +/** + * __disable_cmf() - switch off the channel measurement for a specific device + * @cdev: The ccw device to be disabled + * + * Returns: %0 for success or a negative error value. + * + * Context: + * non-atomic, device_lock() held. + */ +int __disable_cmf(struct ccw_device *cdev) +{ + int ret; + + ret = cmbops->set(cdev, 0); + if (ret) + return ret; + + sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group); + cmbops->free(cdev); + put_device(&cdev->dev); + + return ret; +} + +/** + * disable_cmf() - switch off the channel measurement for a specific device + * @cdev: The ccw device to be disabled + * + * Returns: %0 for success or a negative error value. + * + * Context: + * non-atomic + */ +int disable_cmf(struct ccw_device *cdev) +{ + int ret; + + device_lock(&cdev->dev); + ret = __disable_cmf(cdev); + device_unlock(&cdev->dev); + + return ret; +} + +/** + * cmf_read() - read one value from the current channel measurement block + * @cdev: the channel to be read + * @index: the index of the value to be read + * + * Returns: The value read or %0 if the value cannot be read. + * + * Context: + * any + */ +u64 cmf_read(struct ccw_device *cdev, int index) +{ + return cmbops->read(cdev, index); +} + +/** + * cmf_readall() - read the current channel measurement block + * @cdev: the channel to be read + * @data: a pointer to a data block that will be filled + * + * Returns: %0 on success, a negative error value otherwise. + * + * Context: + * any + */ +int cmf_readall(struct ccw_device *cdev, struct cmbdata *data) +{ + return cmbops->readall(cdev, data); +} + +/* Reenable cmf when a disconnected device becomes available again. */ +int cmf_reenable(struct ccw_device *cdev) +{ + cmbops->reset(cdev); + return cmbops->set(cdev, 2); +} + +/** + * cmf_reactivate() - reactivate measurement block updates + * + * Use this during resume from hibernate. + */ +void cmf_reactivate(void) +{ + spin_lock(&cmb_area.lock); + if (!list_empty(&cmb_area.list)) + cmf_activate(cmb_area.mem, CMF_ON); + spin_unlock(&cmb_area.lock); +} + +static int __init init_cmbe(void) +{ + cmbe_cache = kmem_cache_create("cmbe_cache", sizeof(struct cmbe), + __alignof__(struct cmbe), 0, NULL); + + return cmbe_cache ? 0 : -ENOMEM; +} + +static int __init init_cmf(void) +{ + char *format_string; + char *detect_string; + int ret; + + /* + * If the user did not give a parameter, see if we are running on a + * machine supporting extended measurement blocks, otherwise fall back + * to basic mode. + */ + if (format == CMF_AUTODETECT) { + if (!css_general_characteristics.ext_mb) { + format = CMF_BASIC; + } else { + format = CMF_EXTENDED; + } + detect_string = "autodetected"; + } else { + detect_string = "parameter"; + } + + switch (format) { + case CMF_BASIC: + format_string = "basic"; + cmbops = &cmbops_basic; + break; + case CMF_EXTENDED: + format_string = "extended"; + cmbops = &cmbops_extended; + + ret = init_cmbe(); + if (ret) + return ret; + break; + default: + return -EINVAL; + } + pr_info("Channel measurement facility initialized using format " + "%s (mode %s)\n", format_string, detect_string); + return 0; +} +device_initcall(init_cmf); + +EXPORT_SYMBOL_GPL(enable_cmf); +EXPORT_SYMBOL_GPL(disable_cmf); +EXPORT_SYMBOL_GPL(cmf_read); +EXPORT_SYMBOL_GPL(cmf_readall); diff --git a/drivers/s390/cio/crw.c b/drivers/s390/cio/crw.c new file mode 100644 index 000000000..fc285ca41 --- /dev/null +++ b/drivers/s390/cio/crw.c @@ -0,0 +1,163 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Channel report handling code + * + * Copyright IBM Corp. 2000, 2009 + * Author(s): Ingo Adlung , + * Martin Schwidefsky , + * Cornelia Huck , + * Heiko Carstens , + */ + +#include +#include +#include +#include +#include +#include +#include "ioasm.h" + +static DEFINE_MUTEX(crw_handler_mutex); +static crw_handler_t crw_handlers[NR_RSCS]; +static atomic_t crw_nr_req = ATOMIC_INIT(0); +static DECLARE_WAIT_QUEUE_HEAD(crw_handler_wait_q); + +/** + * crw_register_handler() - register a channel report word handler + * @rsc: reporting source code to handle + * @handler: handler to be registered + * + * Returns %0 on success and a negative error value otherwise. + */ +int crw_register_handler(int rsc, crw_handler_t handler) +{ + int rc = 0; + + if ((rsc < 0) || (rsc >= NR_RSCS)) + return -EINVAL; + mutex_lock(&crw_handler_mutex); + if (crw_handlers[rsc]) + rc = -EBUSY; + else + crw_handlers[rsc] = handler; + mutex_unlock(&crw_handler_mutex); + return rc; +} + +/** + * crw_unregister_handler() - unregister a channel report word handler + * @rsc: reporting source code to handle + */ +void crw_unregister_handler(int rsc) +{ + if ((rsc < 0) || (rsc >= NR_RSCS)) + return; + mutex_lock(&crw_handler_mutex); + crw_handlers[rsc] = NULL; + mutex_unlock(&crw_handler_mutex); +} + +/* + * Retrieve CRWs and call function to handle event. + */ +static int crw_collect_info(void *unused) +{ + struct crw crw[2]; + int ccode, signal; + unsigned int chain; + +repeat: + signal = wait_event_interruptible(crw_handler_wait_q, + atomic_read(&crw_nr_req) > 0); + if (unlikely(signal)) + atomic_inc(&crw_nr_req); + chain = 0; + while (1) { + crw_handler_t handler; + + if (unlikely(chain > 1)) { + struct crw tmp_crw; + + printk(KERN_WARNING"%s: Code does not support more " + "than two chained crws; please report to " + "linux390@de.ibm.com!\n", __func__); + ccode = stcrw(&tmp_crw); + printk(KERN_WARNING"%s: crw reports slct=%d, oflw=%d, " + "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", + __func__, tmp_crw.slct, tmp_crw.oflw, + tmp_crw.chn, tmp_crw.rsc, tmp_crw.anc, + tmp_crw.erc, tmp_crw.rsid); + printk(KERN_WARNING"%s: This was crw number %x in the " + "chain\n", __func__, chain); + if (ccode != 0) + break; + chain = tmp_crw.chn ? chain + 1 : 0; + continue; + } + ccode = stcrw(&crw[chain]); + if (ccode != 0) + break; + printk(KERN_DEBUG "crw_info : CRW reports slct=%d, oflw=%d, " + "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", + crw[chain].slct, crw[chain].oflw, crw[chain].chn, + crw[chain].rsc, crw[chain].anc, crw[chain].erc, + crw[chain].rsid); + /* Check for overflows. */ + if (crw[chain].oflw) { + int i; + + pr_debug("%s: crw overflow detected!\n", __func__); + mutex_lock(&crw_handler_mutex); + for (i = 0; i < NR_RSCS; i++) { + if (crw_handlers[i]) + crw_handlers[i](NULL, NULL, 1); + } + mutex_unlock(&crw_handler_mutex); + chain = 0; + continue; + } + if (crw[0].chn && !chain) { + chain++; + continue; + } + mutex_lock(&crw_handler_mutex); + handler = crw_handlers[crw[chain].rsc]; + if (handler) + handler(&crw[0], chain ? &crw[1] : NULL, 0); + mutex_unlock(&crw_handler_mutex); + /* chain is always 0 or 1 here. */ + chain = crw[chain].chn ? chain + 1 : 0; + } + if (atomic_dec_and_test(&crw_nr_req)) + wake_up(&crw_handler_wait_q); + goto repeat; + return 0; +} + +void crw_handle_channel_report(void) +{ + atomic_inc(&crw_nr_req); + wake_up(&crw_handler_wait_q); +} + +void crw_wait_for_channel_report(void) +{ + crw_handle_channel_report(); + wait_event(crw_handler_wait_q, atomic_read(&crw_nr_req) == 0); +} + +/* + * Machine checks for the channel subsystem must be enabled + * after the channel subsystem is initialized + */ +static int __init crw_machine_check_init(void) +{ + struct task_struct *task; + + task = kthread_run(crw_collect_info, NULL, "kmcheck"); + if (IS_ERR(task)) + return PTR_ERR(task); + ctl_set_bit(14, 28); /* enable channel report MCH */ + return 0; +} +device_initcall(crw_machine_check_init); diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c new file mode 100644 index 000000000..10e8b3b15 --- /dev/null +++ b/drivers/s390/cio/css.c @@ -0,0 +1,1404 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * driver for channel subsystem + * + * Copyright IBM Corp. 2002, 2010 + * + * Author(s): Arnd Bergmann (arndb@de.ibm.com) + * Cornelia Huck (cornelia.huck@de.ibm.com) + */ + +#define KMSG_COMPONENT "cio" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "css.h" +#include "cio.h" +#include "blacklist.h" +#include "cio_debug.h" +#include "ioasm.h" +#include "chsc.h" +#include "device.h" +#include "idset.h" +#include "chp.h" + +int css_init_done = 0; +int max_ssid; + +#define MAX_CSS_IDX 0 +struct channel_subsystem *channel_subsystems[MAX_CSS_IDX + 1]; +static struct bus_type css_bus_type; + +int +for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) +{ + struct subchannel_id schid; + int ret; + + init_subchannel_id(&schid); + do { + do { + ret = fn(schid, data); + if (ret) + break; + } while (schid.sch_no++ < __MAX_SUBCHANNEL); + schid.sch_no = 0; + } while (schid.ssid++ < max_ssid); + return ret; +} + +struct cb_data { + void *data; + struct idset *set; + int (*fn_known_sch)(struct subchannel *, void *); + int (*fn_unknown_sch)(struct subchannel_id, void *); +}; + +static int call_fn_known_sch(struct device *dev, void *data) +{ + struct subchannel *sch = to_subchannel(dev); + struct cb_data *cb = data; + int rc = 0; + + if (cb->set) + idset_sch_del(cb->set, sch->schid); + if (cb->fn_known_sch) + rc = cb->fn_known_sch(sch, cb->data); + return rc; +} + +static int call_fn_unknown_sch(struct subchannel_id schid, void *data) +{ + struct cb_data *cb = data; + int rc = 0; + + if (idset_sch_contains(cb->set, schid)) + rc = cb->fn_unknown_sch(schid, cb->data); + return rc; +} + +static int call_fn_all_sch(struct subchannel_id schid, void *data) +{ + struct cb_data *cb = data; + struct subchannel *sch; + int rc = 0; + + sch = get_subchannel_by_schid(schid); + if (sch) { + if (cb->fn_known_sch) + rc = cb->fn_known_sch(sch, cb->data); + put_device(&sch->dev); + } else { + if (cb->fn_unknown_sch) + rc = cb->fn_unknown_sch(schid, cb->data); + } + + return rc; +} + +int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), + int (*fn_unknown)(struct subchannel_id, + void *), void *data) +{ + struct cb_data cb; + int rc; + + cb.data = data; + cb.fn_known_sch = fn_known; + cb.fn_unknown_sch = fn_unknown; + + if (fn_known && !fn_unknown) { + /* Skip idset allocation in case of known-only loop. */ + cb.set = NULL; + return bus_for_each_dev(&css_bus_type, NULL, &cb, + call_fn_known_sch); + } + + cb.set = idset_sch_new(); + if (!cb.set) + /* fall back to brute force scanning in case of oom */ + return for_each_subchannel(call_fn_all_sch, &cb); + + idset_fill(cb.set); + + /* Process registered subchannels. */ + rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch); + if (rc) + goto out; + /* Process unregistered subchannels. */ + if (fn_unknown) + rc = for_each_subchannel(call_fn_unknown_sch, &cb); +out: + idset_free(cb.set); + + return rc; +} + +static void css_sch_todo(struct work_struct *work); + +static int css_sch_create_locks(struct subchannel *sch) +{ + sch->lock = kmalloc(sizeof(*sch->lock), GFP_KERNEL); + if (!sch->lock) + return -ENOMEM; + + spin_lock_init(sch->lock); + mutex_init(&sch->reg_mutex); + + return 0; +} + +static void css_subchannel_release(struct device *dev) +{ + struct subchannel *sch = to_subchannel(dev); + + sch->config.intparm = 0; + cio_commit_config(sch); + kfree(sch->lock); + kfree(sch); +} + +static int css_validate_subchannel(struct subchannel_id schid, + struct schib *schib) +{ + int err; + + switch (schib->pmcw.st) { + case SUBCHANNEL_TYPE_IO: + case SUBCHANNEL_TYPE_MSG: + if (!css_sch_is_valid(schib)) + err = -ENODEV; + else if (is_blacklisted(schid.ssid, schib->pmcw.dev)) { + CIO_MSG_EVENT(6, "Blacklisted device detected " + "at devno %04X, subchannel set %x\n", + schib->pmcw.dev, schid.ssid); + err = -ENODEV; + } else + err = 0; + break; + default: + err = 0; + } + if (err) + goto out; + + CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n", + schid.ssid, schid.sch_no, schib->pmcw.st); +out: + return err; +} + +struct subchannel *css_alloc_subchannel(struct subchannel_id schid, + struct schib *schib) +{ + struct subchannel *sch; + int ret; + + ret = css_validate_subchannel(schid, schib); + if (ret < 0) + return ERR_PTR(ret); + + sch = kzalloc(sizeof(*sch), GFP_KERNEL | GFP_DMA); + if (!sch) + return ERR_PTR(-ENOMEM); + + sch->schid = schid; + sch->schib = *schib; + sch->st = schib->pmcw.st; + + ret = css_sch_create_locks(sch); + if (ret) + goto err; + + INIT_WORK(&sch->todo_work, css_sch_todo); + sch->dev.release = &css_subchannel_release; + device_initialize(&sch->dev); + return sch; + +err: + kfree(sch); + return ERR_PTR(ret); +} + +static int css_sch_device_register(struct subchannel *sch) +{ + int ret; + + mutex_lock(&sch->reg_mutex); + dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid, + sch->schid.sch_no); + ret = device_add(&sch->dev); + mutex_unlock(&sch->reg_mutex); + return ret; +} + +/** + * css_sch_device_unregister - unregister a subchannel + * @sch: subchannel to be unregistered + */ +void css_sch_device_unregister(struct subchannel *sch) +{ + mutex_lock(&sch->reg_mutex); + if (device_is_registered(&sch->dev)) + device_unregister(&sch->dev); + mutex_unlock(&sch->reg_mutex); +} +EXPORT_SYMBOL_GPL(css_sch_device_unregister); + +static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw) +{ + int i; + int mask; + + memset(ssd, 0, sizeof(struct chsc_ssd_info)); + ssd->path_mask = pmcw->pim; + for (i = 0; i < 8; i++) { + mask = 0x80 >> i; + if (pmcw->pim & mask) { + chp_id_init(&ssd->chpid[i]); + ssd->chpid[i].id = pmcw->chpid[i]; + } + } +} + +static void ssd_register_chpids(struct chsc_ssd_info *ssd) +{ + int i; + int mask; + + for (i = 0; i < 8; i++) { + mask = 0x80 >> i; + if (ssd->path_mask & mask) + chp_new(ssd->chpid[i]); + } +} + +void css_update_ssd_info(struct subchannel *sch) +{ + int ret; + + ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info); + if (ret) + ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw); + + ssd_register_chpids(&sch->ssd_info); +} + +static ssize_t type_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct subchannel *sch = to_subchannel(dev); + + return sprintf(buf, "%01x\n", sch->st); +} + +static DEVICE_ATTR_RO(type); + +static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct subchannel *sch = to_subchannel(dev); + + return sprintf(buf, "css:t%01X\n", sch->st); +} + +static DEVICE_ATTR_RO(modalias); + +static struct attribute *subch_attrs[] = { + &dev_attr_type.attr, + &dev_attr_modalias.attr, + NULL, +}; + +static struct attribute_group subch_attr_group = { + .attrs = subch_attrs, +}; + +static const struct attribute_group *default_subch_attr_groups[] = { + &subch_attr_group, + NULL, +}; + +static ssize_t chpids_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct subchannel *sch = to_subchannel(dev); + struct chsc_ssd_info *ssd = &sch->ssd_info; + ssize_t ret = 0; + int mask; + int chp; + + for (chp = 0; chp < 8; chp++) { + mask = 0x80 >> chp; + if (ssd->path_mask & mask) + ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id); + else + ret += sprintf(buf + ret, "00 "); + } + ret += sprintf(buf + ret, "\n"); + return ret; +} +static DEVICE_ATTR_RO(chpids); + +static ssize_t pimpampom_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct subchannel *sch = to_subchannel(dev); + struct pmcw *pmcw = &sch->schib.pmcw; + + return sprintf(buf, "%02x %02x %02x\n", + pmcw->pim, pmcw->pam, pmcw->pom); +} +static DEVICE_ATTR_RO(pimpampom); + +static ssize_t dev_busid_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct subchannel *sch = to_subchannel(dev); + struct pmcw *pmcw = &sch->schib.pmcw; + + if ((pmcw->st == SUBCHANNEL_TYPE_IO && pmcw->dnv) || + (pmcw->st == SUBCHANNEL_TYPE_MSG && pmcw->w)) + return sysfs_emit(buf, "0.%x.%04x\n", sch->schid.ssid, + pmcw->dev); + else + return sysfs_emit(buf, "none\n"); +} +static DEVICE_ATTR_RO(dev_busid); + +static struct attribute *io_subchannel_type_attrs[] = { + &dev_attr_chpids.attr, + &dev_attr_pimpampom.attr, + &dev_attr_dev_busid.attr, + NULL, +}; +ATTRIBUTE_GROUPS(io_subchannel_type); + +static const struct device_type io_subchannel_type = { + .groups = io_subchannel_type_groups, +}; + +int css_register_subchannel(struct subchannel *sch) +{ + int ret; + + /* Initialize the subchannel structure */ + sch->dev.parent = &channel_subsystems[0]->device; + sch->dev.bus = &css_bus_type; + sch->dev.groups = default_subch_attr_groups; + + if (sch->st == SUBCHANNEL_TYPE_IO) + sch->dev.type = &io_subchannel_type; + + /* + * We don't want to generate uevents for I/O subchannels that don't + * have a working ccw device behind them since they will be + * unregistered before they can be used anyway, so we delay the add + * uevent until after device recognition was successful. + * Note that we suppress the uevent for all subchannel types; + * the subchannel driver can decide itself when it wants to inform + * userspace of its existence. + */ + dev_set_uevent_suppress(&sch->dev, 1); + css_update_ssd_info(sch); + /* make it known to the system */ + ret = css_sch_device_register(sch); + if (ret) { + CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n", + sch->schid.ssid, sch->schid.sch_no, ret); + return ret; + } + if (!sch->driver) { + /* + * No driver matched. Generate the uevent now so that + * a fitting driver module may be loaded based on the + * modalias. + */ + dev_set_uevent_suppress(&sch->dev, 0); + kobject_uevent(&sch->dev.kobj, KOBJ_ADD); + } + return ret; +} + +static int css_probe_device(struct subchannel_id schid, struct schib *schib) +{ + struct subchannel *sch; + int ret; + + sch = css_alloc_subchannel(schid, schib); + if (IS_ERR(sch)) + return PTR_ERR(sch); + + ret = css_register_subchannel(sch); + if (ret) + put_device(&sch->dev); + + return ret; +} + +static int +check_subchannel(struct device * dev, void * data) +{ + struct subchannel *sch; + struct subchannel_id *schid = data; + + sch = to_subchannel(dev); + return schid_equal(&sch->schid, schid); +} + +struct subchannel * +get_subchannel_by_schid(struct subchannel_id schid) +{ + struct device *dev; + + dev = bus_find_device(&css_bus_type, NULL, + &schid, check_subchannel); + + return dev ? to_subchannel(dev) : NULL; +} + +/** + * css_sch_is_valid() - check if a subchannel is valid + * @schib: subchannel information block for the subchannel + */ +int css_sch_is_valid(struct schib *schib) +{ + if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv) + return 0; + if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w) + return 0; + return 1; +} +EXPORT_SYMBOL_GPL(css_sch_is_valid); + +static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow) +{ + struct schib schib; + int ccode; + + if (!slow) { + /* Will be done on the slow path. */ + return -EAGAIN; + } + /* + * The first subchannel that is not-operational (ccode==3) + * indicates that there aren't any more devices available. + * If stsch gets an exception, it means the current subchannel set + * is not valid. + */ + ccode = stsch(schid, &schib); + if (ccode) + return (ccode == 3) ? -ENXIO : ccode; + + return css_probe_device(schid, &schib); +} + +static int css_evaluate_known_subchannel(struct subchannel *sch, int slow) +{ + int ret = 0; + + if (sch->driver) { + if (sch->driver->sch_event) + ret = sch->driver->sch_event(sch, slow); + else + dev_dbg(&sch->dev, + "Got subchannel machine check but " + "no sch_event handler provided.\n"); + } + if (ret != 0 && ret != -EAGAIN) { + CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n", + sch->schid.ssid, sch->schid.sch_no, ret); + } + return ret; +} + +static void css_evaluate_subchannel(struct subchannel_id schid, int slow) +{ + struct subchannel *sch; + int ret; + + sch = get_subchannel_by_schid(schid); + if (sch) { + ret = css_evaluate_known_subchannel(sch, slow); + put_device(&sch->dev); + } else + ret = css_evaluate_new_subchannel(schid, slow); + if (ret == -EAGAIN) + css_schedule_eval(schid); +} + +/** + * css_sched_sch_todo - schedule a subchannel operation + * @sch: subchannel + * @todo: todo + * + * Schedule the operation identified by @todo to be performed on the slow path + * workqueue. Do nothing if another operation with higher priority is already + * scheduled. Needs to be called with subchannel lock held. + */ +void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo) +{ + CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d\n", + sch->schid.ssid, sch->schid.sch_no, todo); + if (sch->todo >= todo) + return; + /* Get workqueue ref. */ + if (!get_device(&sch->dev)) + return; + sch->todo = todo; + if (!queue_work(cio_work_q, &sch->todo_work)) { + /* Already queued, release workqueue ref. */ + put_device(&sch->dev); + } +} +EXPORT_SYMBOL_GPL(css_sched_sch_todo); + +static void css_sch_todo(struct work_struct *work) +{ + struct subchannel *sch; + enum sch_todo todo; + int ret; + + sch = container_of(work, struct subchannel, todo_work); + /* Find out todo. */ + spin_lock_irq(sch->lock); + todo = sch->todo; + CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid, + sch->schid.sch_no, todo); + sch->todo = SCH_TODO_NOTHING; + spin_unlock_irq(sch->lock); + /* Perform todo. */ + switch (todo) { + case SCH_TODO_NOTHING: + break; + case SCH_TODO_EVAL: + ret = css_evaluate_known_subchannel(sch, 1); + if (ret == -EAGAIN) { + spin_lock_irq(sch->lock); + css_sched_sch_todo(sch, todo); + spin_unlock_irq(sch->lock); + } + break; + case SCH_TODO_UNREG: + css_sch_device_unregister(sch); + break; + } + /* Release workqueue ref. */ + put_device(&sch->dev); +} + +static struct idset *slow_subchannel_set; +static spinlock_t slow_subchannel_lock; +static wait_queue_head_t css_eval_wq; +static atomic_t css_eval_scheduled; + +static int __init slow_subchannel_init(void) +{ + spin_lock_init(&slow_subchannel_lock); + atomic_set(&css_eval_scheduled, 0); + init_waitqueue_head(&css_eval_wq); + slow_subchannel_set = idset_sch_new(); + if (!slow_subchannel_set) { + CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n"); + return -ENOMEM; + } + return 0; +} + +static int slow_eval_known_fn(struct subchannel *sch, void *data) +{ + int eval; + int rc; + + spin_lock_irq(&slow_subchannel_lock); + eval = idset_sch_contains(slow_subchannel_set, sch->schid); + idset_sch_del(slow_subchannel_set, sch->schid); + spin_unlock_irq(&slow_subchannel_lock); + if (eval) { + rc = css_evaluate_known_subchannel(sch, 1); + if (rc == -EAGAIN) + css_schedule_eval(sch->schid); + /* + * The loop might take long time for platforms with lots of + * known devices. Allow scheduling here. + */ + cond_resched(); + } + return 0; +} + +static int slow_eval_unknown_fn(struct subchannel_id schid, void *data) +{ + int eval; + int rc = 0; + + spin_lock_irq(&slow_subchannel_lock); + eval = idset_sch_contains(slow_subchannel_set, schid); + idset_sch_del(slow_subchannel_set, schid); + spin_unlock_irq(&slow_subchannel_lock); + if (eval) { + rc = css_evaluate_new_subchannel(schid, 1); + switch (rc) { + case -EAGAIN: + css_schedule_eval(schid); + rc = 0; + break; + case -ENXIO: + case -ENOMEM: + case -EIO: + /* These should abort looping */ + spin_lock_irq(&slow_subchannel_lock); + idset_sch_del_subseq(slow_subchannel_set, schid); + spin_unlock_irq(&slow_subchannel_lock); + break; + default: + rc = 0; + } + /* Allow scheduling here since the containing loop might + * take a while. */ + cond_resched(); + } + return rc; +} + +static void css_slow_path_func(struct work_struct *unused) +{ + unsigned long flags; + + CIO_TRACE_EVENT(4, "slowpath"); + for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn, + NULL); + spin_lock_irqsave(&slow_subchannel_lock, flags); + if (idset_is_empty(slow_subchannel_set)) { + atomic_set(&css_eval_scheduled, 0); + wake_up(&css_eval_wq); + } + spin_unlock_irqrestore(&slow_subchannel_lock, flags); +} + +static DECLARE_DELAYED_WORK(slow_path_work, css_slow_path_func); +struct workqueue_struct *cio_work_q; + +void css_schedule_eval(struct subchannel_id schid) +{ + unsigned long flags; + + spin_lock_irqsave(&slow_subchannel_lock, flags); + idset_sch_add(slow_subchannel_set, schid); + atomic_set(&css_eval_scheduled, 1); + queue_delayed_work(cio_work_q, &slow_path_work, 0); + spin_unlock_irqrestore(&slow_subchannel_lock, flags); +} + +void css_schedule_eval_all(void) +{ + unsigned long flags; + + spin_lock_irqsave(&slow_subchannel_lock, flags); + idset_fill(slow_subchannel_set); + atomic_set(&css_eval_scheduled, 1); + queue_delayed_work(cio_work_q, &slow_path_work, 0); + spin_unlock_irqrestore(&slow_subchannel_lock, flags); +} + +static int __unset_registered(struct device *dev, void *data) +{ + struct idset *set = data; + struct subchannel *sch = to_subchannel(dev); + + idset_sch_del(set, sch->schid); + return 0; +} + +void css_schedule_eval_all_unreg(unsigned long delay) +{ + unsigned long flags; + struct idset *unreg_set; + + /* Find unregistered subchannels. */ + unreg_set = idset_sch_new(); + if (!unreg_set) { + /* Fallback. */ + css_schedule_eval_all(); + return; + } + idset_fill(unreg_set); + bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered); + /* Apply to slow_subchannel_set. */ + spin_lock_irqsave(&slow_subchannel_lock, flags); + idset_add_set(slow_subchannel_set, unreg_set); + atomic_set(&css_eval_scheduled, 1); + queue_delayed_work(cio_work_q, &slow_path_work, delay); + spin_unlock_irqrestore(&slow_subchannel_lock, flags); + idset_free(unreg_set); +} + +void css_wait_for_slow_path(void) +{ + flush_workqueue(cio_work_q); +} + +/* Schedule reprobing of all unregistered subchannels. */ +void css_schedule_reprobe(void) +{ + /* Schedule with a delay to allow merging of subsequent calls. */ + css_schedule_eval_all_unreg(1 * HZ); +} +EXPORT_SYMBOL_GPL(css_schedule_reprobe); + +/* + * Called from the machine check handler for subchannel report words. + */ +static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) +{ + struct subchannel_id mchk_schid; + struct subchannel *sch; + + if (overflow) { + css_schedule_eval_all(); + return; + } + CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, " + "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", + crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, + crw0->erc, crw0->rsid); + if (crw1) + CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, " + "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", + crw1->slct, crw1->oflw, crw1->chn, crw1->rsc, + crw1->anc, crw1->erc, crw1->rsid); + init_subchannel_id(&mchk_schid); + mchk_schid.sch_no = crw0->rsid; + if (crw1) + mchk_schid.ssid = (crw1->rsid >> 4) & 3; + + if (crw0->erc == CRW_ERC_PMOD) { + sch = get_subchannel_by_schid(mchk_schid); + if (sch) { + css_update_ssd_info(sch); + put_device(&sch->dev); + } + } + /* + * Since we are always presented with IPI in the CRW, we have to + * use stsch() to find out if the subchannel in question has come + * or gone. + */ + css_evaluate_subchannel(mchk_schid, 0); +} + +static void __init +css_generate_pgid(struct channel_subsystem *css, u32 tod_high) +{ + struct cpuid cpu_id; + + if (css_general_characteristics.mcss) { + css->global_pgid.pgid_high.ext_cssid.version = 0x80; + css->global_pgid.pgid_high.ext_cssid.cssid = + (css->cssid < 0) ? 0 : css->cssid; + } else { + css->global_pgid.pgid_high.cpu_addr = stap(); + } + get_cpu_id(&cpu_id); + css->global_pgid.cpu_id = cpu_id.ident; + css->global_pgid.cpu_model = cpu_id.machine; + css->global_pgid.tod_high = tod_high; +} + +static void channel_subsystem_release(struct device *dev) +{ + struct channel_subsystem *css = to_css(dev); + + mutex_destroy(&css->mutex); + kfree(css); +} + +static ssize_t real_cssid_show(struct device *dev, struct device_attribute *a, + char *buf) +{ + struct channel_subsystem *css = to_css(dev); + + if (css->cssid < 0) + return -EINVAL; + + return sprintf(buf, "%x\n", css->cssid); +} +static DEVICE_ATTR_RO(real_cssid); + +static ssize_t cm_enable_show(struct device *dev, struct device_attribute *a, + char *buf) +{ + struct channel_subsystem *css = to_css(dev); + int ret; + + mutex_lock(&css->mutex); + ret = sprintf(buf, "%x\n", css->cm_enabled); + mutex_unlock(&css->mutex); + return ret; +} + +static ssize_t cm_enable_store(struct device *dev, struct device_attribute *a, + const char *buf, size_t count) +{ + struct channel_subsystem *css = to_css(dev); + unsigned long val; + int ret; + + ret = kstrtoul(buf, 16, &val); + if (ret) + return ret; + mutex_lock(&css->mutex); + switch (val) { + case 0: + ret = css->cm_enabled ? chsc_secm(css, 0) : 0; + break; + case 1: + ret = css->cm_enabled ? 0 : chsc_secm(css, 1); + break; + default: + ret = -EINVAL; + } + mutex_unlock(&css->mutex); + return ret < 0 ? ret : count; +} +static DEVICE_ATTR_RW(cm_enable); + +static umode_t cm_enable_mode(struct kobject *kobj, struct attribute *attr, + int index) +{ + return css_chsc_characteristics.secm ? attr->mode : 0; +} + +static struct attribute *cssdev_attrs[] = { + &dev_attr_real_cssid.attr, + NULL, +}; + +static struct attribute_group cssdev_attr_group = { + .attrs = cssdev_attrs, +}; + +static struct attribute *cssdev_cm_attrs[] = { + &dev_attr_cm_enable.attr, + NULL, +}; + +static struct attribute_group cssdev_cm_attr_group = { + .attrs = cssdev_cm_attrs, + .is_visible = cm_enable_mode, +}; + +static const struct attribute_group *cssdev_attr_groups[] = { + &cssdev_attr_group, + &cssdev_cm_attr_group, + NULL, +}; + +static int __init setup_css(int nr) +{ + struct channel_subsystem *css; + int ret; + + css = kzalloc(sizeof(*css), GFP_KERNEL); + if (!css) + return -ENOMEM; + + channel_subsystems[nr] = css; + dev_set_name(&css->device, "css%x", nr); + css->device.groups = cssdev_attr_groups; + css->device.release = channel_subsystem_release; + + mutex_init(&css->mutex); + css->cssid = chsc_get_cssid(nr); + css_generate_pgid(css, (u32) (get_tod_clock() >> 32)); + + ret = device_register(&css->device); + if (ret) { + put_device(&css->device); + goto out_err; + } + + css->pseudo_subchannel = kzalloc(sizeof(*css->pseudo_subchannel), + GFP_KERNEL); + if (!css->pseudo_subchannel) { + device_unregister(&css->device); + ret = -ENOMEM; + goto out_err; + } + + css->pseudo_subchannel->dev.parent = &css->device; + css->pseudo_subchannel->dev.release = css_subchannel_release; + mutex_init(&css->pseudo_subchannel->reg_mutex); + ret = css_sch_create_locks(css->pseudo_subchannel); + if (ret) { + kfree(css->pseudo_subchannel); + device_unregister(&css->device); + goto out_err; + } + + dev_set_name(&css->pseudo_subchannel->dev, "defunct"); + ret = device_register(&css->pseudo_subchannel->dev); + if (ret) { + put_device(&css->pseudo_subchannel->dev); + device_unregister(&css->device); + goto out_err; + } + + return ret; +out_err: + channel_subsystems[nr] = NULL; + return ret; +} + +static int css_reboot_event(struct notifier_block *this, + unsigned long event, + void *ptr) +{ + struct channel_subsystem *css; + int ret; + + ret = NOTIFY_DONE; + for_each_css(css) { + mutex_lock(&css->mutex); + if (css->cm_enabled) + if (chsc_secm(css, 0)) + ret = NOTIFY_BAD; + mutex_unlock(&css->mutex); + } + + return ret; +} + +static struct notifier_block css_reboot_notifier = { + .notifier_call = css_reboot_event, +}; + +/* + * Since the css devices are neither on a bus nor have a class + * nor have a special device type, we cannot stop/restart channel + * path measurements via the normal suspend/resume callbacks, but have + * to use notifiers. + */ +static int css_power_event(struct notifier_block *this, unsigned long event, + void *ptr) +{ + struct channel_subsystem *css; + int ret; + + switch (event) { + case PM_HIBERNATION_PREPARE: + case PM_SUSPEND_PREPARE: + ret = NOTIFY_DONE; + for_each_css(css) { + mutex_lock(&css->mutex); + if (!css->cm_enabled) { + mutex_unlock(&css->mutex); + continue; + } + ret = __chsc_do_secm(css, 0); + ret = notifier_from_errno(ret); + mutex_unlock(&css->mutex); + } + break; + case PM_POST_HIBERNATION: + case PM_POST_SUSPEND: + ret = NOTIFY_DONE; + for_each_css(css) { + mutex_lock(&css->mutex); + if (!css->cm_enabled) { + mutex_unlock(&css->mutex); + continue; + } + ret = __chsc_do_secm(css, 1); + ret = notifier_from_errno(ret); + mutex_unlock(&css->mutex); + } + /* search for subchannels, which appeared during hibernation */ + css_schedule_reprobe(); + break; + default: + ret = NOTIFY_DONE; + } + return ret; + +} +static struct notifier_block css_power_notifier = { + .notifier_call = css_power_event, +}; + +/* + * Now that the driver core is running, we can setup our channel subsystem. + * The struct subchannel's are created during probing. + */ +static int __init css_bus_init(void) +{ + int ret, i; + + ret = chsc_init(); + if (ret) + return ret; + + chsc_determine_css_characteristics(); + /* Try to enable MSS. */ + ret = chsc_enable_facility(CHSC_SDA_OC_MSS); + if (ret) + max_ssid = 0; + else /* Success. */ + max_ssid = __MAX_SSID; + + ret = slow_subchannel_init(); + if (ret) + goto out; + + ret = crw_register_handler(CRW_RSC_SCH, css_process_crw); + if (ret) + goto out; + + if ((ret = bus_register(&css_bus_type))) + goto out; + + /* Setup css structure. */ + for (i = 0; i <= MAX_CSS_IDX; i++) { + ret = setup_css(i); + if (ret) + goto out_unregister; + } + ret = register_reboot_notifier(&css_reboot_notifier); + if (ret) + goto out_unregister; + ret = register_pm_notifier(&css_power_notifier); + if (ret) { + unregister_reboot_notifier(&css_reboot_notifier); + goto out_unregister; + } + css_init_done = 1; + + /* Enable default isc for I/O subchannels. */ + isc_register(IO_SCH_ISC); + + return 0; +out_unregister: + while (i-- > 0) { + struct channel_subsystem *css = channel_subsystems[i]; + device_unregister(&css->pseudo_subchannel->dev); + device_unregister(&css->device); + } + bus_unregister(&css_bus_type); +out: + crw_unregister_handler(CRW_RSC_SCH); + idset_free(slow_subchannel_set); + chsc_init_cleanup(); + pr_alert("The CSS device driver initialization failed with " + "errno=%d\n", ret); + return ret; +} + +static void __init css_bus_cleanup(void) +{ + struct channel_subsystem *css; + + for_each_css(css) { + device_unregister(&css->pseudo_subchannel->dev); + device_unregister(&css->device); + } + bus_unregister(&css_bus_type); + crw_unregister_handler(CRW_RSC_SCH); + idset_free(slow_subchannel_set); + chsc_init_cleanup(); + isc_unregister(IO_SCH_ISC); +} + +static int __init channel_subsystem_init(void) +{ + int ret; + + ret = css_bus_init(); + if (ret) + return ret; + cio_work_q = create_singlethread_workqueue("cio"); + if (!cio_work_q) { + ret = -ENOMEM; + goto out_bus; + } + ret = io_subchannel_init(); + if (ret) + goto out_wq; + + /* Register subchannels which are already in use. */ + cio_register_early_subchannels(); + /* Start initial subchannel evaluation. */ + css_schedule_eval_all(); + + return ret; +out_wq: + destroy_workqueue(cio_work_q); +out_bus: + css_bus_cleanup(); + return ret; +} +subsys_initcall(channel_subsystem_init); + +static int css_settle(struct device_driver *drv, void *unused) +{ + struct css_driver *cssdrv = to_cssdriver(drv); + + if (cssdrv->settle) + return cssdrv->settle(); + return 0; +} + +int css_complete_work(void) +{ + int ret; + + /* Wait for the evaluation of subchannels to finish. */ + ret = wait_event_interruptible(css_eval_wq, + atomic_read(&css_eval_scheduled) == 0); + if (ret) + return -EINTR; + flush_workqueue(cio_work_q); + /* Wait for the subchannel type specific initialization to finish */ + return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle); +} + + +/* + * Wait for the initialization of devices to finish, to make sure we are + * done with our setup if the search for the root device starts. + */ +static int __init channel_subsystem_init_sync(void) +{ + css_complete_work(); + return 0; +} +subsys_initcall_sync(channel_subsystem_init_sync); + +void channel_subsystem_reinit(void) +{ + struct channel_path *chp; + struct chp_id chpid; + + chsc_enable_facility(CHSC_SDA_OC_MSS); + chp_id_for_each(&chpid) { + chp = chpid_to_chp(chpid); + if (chp) + chp_update_desc(chp); + } + cmf_reactivate(); +} + +#ifdef CONFIG_PROC_FS +static ssize_t cio_settle_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + int ret; + + /* Handle pending CRW's. */ + crw_wait_for_channel_report(); + ret = css_complete_work(); + + return ret ? ret : count; +} + +static const struct file_operations cio_settle_proc_fops = { + .open = nonseekable_open, + .write = cio_settle_write, + .llseek = no_llseek, +}; + +static int __init cio_settle_init(void) +{ + struct proc_dir_entry *entry; + + entry = proc_create("cio_settle", S_IWUSR, NULL, + &cio_settle_proc_fops); + if (!entry) + return -ENOMEM; + return 0; +} +device_initcall(cio_settle_init); +#endif /*CONFIG_PROC_FS*/ + +int sch_is_pseudo_sch(struct subchannel *sch) +{ + if (!sch->dev.parent) + return 0; + return sch == to_css(sch->dev.parent)->pseudo_subchannel; +} + +static int css_bus_match(struct device *dev, struct device_driver *drv) +{ + struct subchannel *sch = to_subchannel(dev); + struct css_driver *driver = to_cssdriver(drv); + struct css_device_id *id; + + for (id = driver->subchannel_type; id->match_flags; id++) { + if (sch->st == id->type) + return 1; + } + + return 0; +} + +static int css_probe(struct device *dev) +{ + struct subchannel *sch; + int ret; + + sch = to_subchannel(dev); + sch->driver = to_cssdriver(dev->driver); + ret = sch->driver->probe ? sch->driver->probe(sch) : 0; + if (ret) + sch->driver = NULL; + return ret; +} + +static int css_remove(struct device *dev) +{ + struct subchannel *sch; + int ret; + + sch = to_subchannel(dev); + ret = sch->driver->remove ? sch->driver->remove(sch) : 0; + sch->driver = NULL; + return ret; +} + +static void css_shutdown(struct device *dev) +{ + struct subchannel *sch; + + sch = to_subchannel(dev); + if (sch->driver && sch->driver->shutdown) + sch->driver->shutdown(sch); +} + +static int css_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct subchannel *sch = to_subchannel(dev); + int ret; + + ret = add_uevent_var(env, "ST=%01X", sch->st); + if (ret) + return ret; + ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st); + return ret; +} + +static int css_pm_prepare(struct device *dev) +{ + struct subchannel *sch = to_subchannel(dev); + struct css_driver *drv; + + if (mutex_is_locked(&sch->reg_mutex)) + return -EAGAIN; + if (!sch->dev.driver) + return 0; + drv = to_cssdriver(sch->dev.driver); + /* Notify drivers that they may not register children. */ + return drv->prepare ? drv->prepare(sch) : 0; +} + +static void css_pm_complete(struct device *dev) +{ + struct subchannel *sch = to_subchannel(dev); + struct css_driver *drv; + + if (!sch->dev.driver) + return; + drv = to_cssdriver(sch->dev.driver); + if (drv->complete) + drv->complete(sch); +} + +static int css_pm_freeze(struct device *dev) +{ + struct subchannel *sch = to_subchannel(dev); + struct css_driver *drv; + + if (!sch->dev.driver) + return 0; + drv = to_cssdriver(sch->dev.driver); + return drv->freeze ? drv->freeze(sch) : 0; +} + +static int css_pm_thaw(struct device *dev) +{ + struct subchannel *sch = to_subchannel(dev); + struct css_driver *drv; + + if (!sch->dev.driver) + return 0; + drv = to_cssdriver(sch->dev.driver); + return drv->thaw ? drv->thaw(sch) : 0; +} + +static int css_pm_restore(struct device *dev) +{ + struct subchannel *sch = to_subchannel(dev); + struct css_driver *drv; + + css_update_ssd_info(sch); + if (!sch->dev.driver) + return 0; + drv = to_cssdriver(sch->dev.driver); + return drv->restore ? drv->restore(sch) : 0; +} + +static const struct dev_pm_ops css_pm_ops = { + .prepare = css_pm_prepare, + .complete = css_pm_complete, + .freeze = css_pm_freeze, + .thaw = css_pm_thaw, + .restore = css_pm_restore, +}; + +static struct bus_type css_bus_type = { + .name = "css", + .match = css_bus_match, + .probe = css_probe, + .remove = css_remove, + .shutdown = css_shutdown, + .uevent = css_uevent, + .pm = &css_pm_ops, +}; + +/** + * css_driver_register - register a css driver + * @cdrv: css driver to register + * + * This is mainly a wrapper around driver_register that sets name + * and bus_type in the embedded struct device_driver correctly. + */ +int css_driver_register(struct css_driver *cdrv) +{ + cdrv->drv.bus = &css_bus_type; + return driver_register(&cdrv->drv); +} +EXPORT_SYMBOL_GPL(css_driver_register); + +/** + * css_driver_unregister - unregister a css driver + * @cdrv: css driver to unregister + * + * This is a wrapper around driver_unregister. + */ +void css_driver_unregister(struct css_driver *cdrv) +{ + driver_unregister(&cdrv->drv); +} +EXPORT_SYMBOL_GPL(css_driver_unregister); diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h new file mode 100644 index 000000000..8d832900a --- /dev/null +++ b/drivers/s390/cio/css.h @@ -0,0 +1,157 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _CSS_H +#define _CSS_H + +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "cio.h" + +/* + * path grouping stuff + */ +#define SPID_FUNC_SINGLE_PATH 0x00 +#define SPID_FUNC_MULTI_PATH 0x80 +#define SPID_FUNC_ESTABLISH 0x00 +#define SPID_FUNC_RESIGN 0x40 +#define SPID_FUNC_DISBAND 0x20 + +#define SNID_STATE1_RESET 0 +#define SNID_STATE1_UNGROUPED 2 +#define SNID_STATE1_GROUPED 3 + +#define SNID_STATE2_NOT_RESVD 0 +#define SNID_STATE2_RESVD_ELSE 2 +#define SNID_STATE2_RESVD_SELF 3 + +#define SNID_STATE3_MULTI_PATH 1 +#define SNID_STATE3_SINGLE_PATH 0 + +struct path_state { + __u8 state1 : 2; /* path state value 1 */ + __u8 state2 : 2; /* path state value 2 */ + __u8 state3 : 1; /* path state value 3 */ + __u8 resvd : 3; /* reserved */ +} __attribute__ ((packed)); + +struct extended_cssid { + u8 version; + u8 cssid; +} __attribute__ ((packed)); + +struct pgid { + union { + __u8 fc; /* SPID function code */ + struct path_state ps; /* SNID path state */ + } __attribute__ ((packed)) inf; + union { + __u32 cpu_addr : 16; /* CPU address */ + struct extended_cssid ext_cssid; + } __attribute__ ((packed)) pgid_high; + __u32 cpu_id : 24; /* CPU identification */ + __u32 cpu_model : 16; /* CPU model */ + __u32 tod_high; /* high word TOD clock */ +} __attribute__ ((packed)); + +struct subchannel; +struct chp_link; +/** + * struct css_driver - device driver for subchannels + * @subchannel_type: subchannel type supported by this driver + * @drv: embedded device driver structure + * @irq: called on interrupts + * @chp_event: called for events affecting a channel path + * @sch_event: called for events affecting the subchannel + * @probe: function called on probe + * @remove: function called on remove + * @shutdown: called at device shutdown + * @prepare: prepare for pm state transition + * @complete: undo work done in @prepare + * @freeze: callback for freezing during hibernation snapshotting + * @thaw: undo work done in @freeze + * @restore: callback for restoring after hibernation + * @settle: wait for asynchronous work to finish + */ +struct css_driver { + struct css_device_id *subchannel_type; + struct device_driver drv; + void (*irq)(struct subchannel *); + int (*chp_event)(struct subchannel *, struct chp_link *, int); + int (*sch_event)(struct subchannel *, int); + int (*probe)(struct subchannel *); + int (*remove)(struct subchannel *); + void (*shutdown)(struct subchannel *); + int (*prepare) (struct subchannel *); + void (*complete) (struct subchannel *); + int (*freeze)(struct subchannel *); + int (*thaw) (struct subchannel *); + int (*restore)(struct subchannel *); + int (*settle)(void); +}; + +#define to_cssdriver(n) container_of(n, struct css_driver, drv) + +extern int css_driver_register(struct css_driver *); +extern void css_driver_unregister(struct css_driver *); + +extern void css_sch_device_unregister(struct subchannel *); +extern int css_register_subchannel(struct subchannel *); +extern struct subchannel *css_alloc_subchannel(struct subchannel_id, + struct schib *schib); +extern struct subchannel *get_subchannel_by_schid(struct subchannel_id); +extern int css_init_done; +extern int max_ssid; +int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), + int (*fn_unknown)(struct subchannel_id, + void *), void *data); +extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); +void css_update_ssd_info(struct subchannel *sch); + +struct channel_subsystem { + int cssid; + struct channel_path *chps[__MAX_CHPID + 1]; + struct device device; + struct pgid global_pgid; + struct mutex mutex; + /* channel measurement related */ + int cm_enabled; + void *cub_addr1; + void *cub_addr2; + /* for orphaned ccw devices */ + struct subchannel *pseudo_subchannel; +}; +#define to_css(dev) container_of(dev, struct channel_subsystem, device) + +extern struct channel_subsystem *channel_subsystems[]; + +/* Dummy helper which needs to change once we support more than one css. */ +static inline struct channel_subsystem *css_by_id(u8 cssid) +{ + return channel_subsystems[0]; +} + +/* Dummy iterator which needs to change once we support more than one css. */ +#define for_each_css(css) \ + for ((css) = channel_subsystems[0]; (css); (css) = NULL) + +/* Helper functions to build lists for the slow path. */ +void css_schedule_eval(struct subchannel_id schid); +void css_schedule_eval_all(void); +void css_schedule_eval_all_unreg(unsigned long delay); +int css_complete_work(void); + +int sch_is_pseudo_sch(struct subchannel *); +struct schib; +int css_sch_is_valid(struct schib *); + +extern struct workqueue_struct *cio_work_q; +void css_wait_for_slow_path(void); +void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo); +#endif diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c new file mode 100644 index 000000000..c9bc9a6bd --- /dev/null +++ b/drivers/s390/cio/device.c @@ -0,0 +1,2127 @@ +// SPDX-License-Identifier: GPL-1.0+ +/* + * bus driver for ccw devices + * + * Copyright IBM Corp. 2002, 2008 + * Author(s): Arnd Bergmann (arndb@de.ibm.com) + * Cornelia Huck (cornelia.huck@de.ibm.com) + * Martin Schwidefsky (schwidefsky@de.ibm.com) + */ + +#define KMSG_COMPONENT "cio" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include /* HZ */ +#include +#include + +#include "chp.h" +#include "cio.h" +#include "cio_debug.h" +#include "css.h" +#include "device.h" +#include "ioasm.h" +#include "io_sch.h" +#include "blacklist.h" +#include "chsc.h" + +static struct timer_list recovery_timer; +static DEFINE_SPINLOCK(recovery_lock); +static int recovery_phase; +static const unsigned long recovery_delay[] = { 3, 30, 300 }; + +static atomic_t ccw_device_init_count = ATOMIC_INIT(0); +static DECLARE_WAIT_QUEUE_HEAD(ccw_device_init_wq); +static struct bus_type ccw_bus_type; + +/******************* bus type handling ***********************/ + +/* The Linux driver model distinguishes between a bus type and + * the bus itself. Of course we only have one channel + * subsystem driver and one channel system per machine, but + * we still use the abstraction. T.R. says it's a good idea. */ +static int +ccw_bus_match (struct device * dev, struct device_driver * drv) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct ccw_driver *cdrv = to_ccwdrv(drv); + const struct ccw_device_id *ids = cdrv->ids, *found; + + if (!ids) + return 0; + + found = ccw_device_id_match(ids, &cdev->id); + if (!found) + return 0; + + cdev->id.driver_info = found->driver_info; + + return 1; +} + +/* Store modalias string delimited by prefix/suffix string into buffer with + * specified size. Return length of resulting string (excluding trailing '\0') + * even if string doesn't fit buffer (snprintf semantics). */ +static int snprint_alias(char *buf, size_t size, + struct ccw_device_id *id, const char *suffix) +{ + int len; + + len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model); + if (len > size) + return len; + buf += len; + size -= len; + + if (id->dev_type != 0) + len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type, + id->dev_model, suffix); + else + len += snprintf(buf, size, "dtdm%s", suffix); + + return len; +} + +/* Set up environment variables for ccw device uevent. Return 0 on success, + * non-zero otherwise. */ +static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct ccw_device_id *id = &(cdev->id); + int ret; + char modalias_buf[30]; + + /* CU_TYPE= */ + ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type); + if (ret) + return ret; + + /* CU_MODEL= */ + ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model); + if (ret) + return ret; + + /* The next two can be zero, that's ok for us */ + /* DEV_TYPE= */ + ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type); + if (ret) + return ret; + + /* DEV_MODEL= */ + ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model); + if (ret) + return ret; + + /* MODALIAS= */ + snprint_alias(modalias_buf, sizeof(modalias_buf), id, ""); + ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf); + return ret; +} + +static void io_subchannel_irq(struct subchannel *); +static int io_subchannel_probe(struct subchannel *); +static int io_subchannel_remove(struct subchannel *); +static void io_subchannel_shutdown(struct subchannel *); +static int io_subchannel_sch_event(struct subchannel *, int); +static int io_subchannel_chp_event(struct subchannel *, struct chp_link *, + int); +static void recovery_func(struct timer_list *unused); + +static struct css_device_id io_subchannel_ids[] = { + { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, + { /* end of list */ }, +}; + +static int io_subchannel_prepare(struct subchannel *sch) +{ + struct ccw_device *cdev; + /* + * Don't allow suspend while a ccw device registration + * is still outstanding. + */ + cdev = sch_get_cdev(sch); + if (cdev && !device_is_registered(&cdev->dev)) + return -EAGAIN; + return 0; +} + +static int io_subchannel_settle(void) +{ + int ret; + + ret = wait_event_interruptible(ccw_device_init_wq, + atomic_read(&ccw_device_init_count) == 0); + if (ret) + return -EINTR; + flush_workqueue(cio_work_q); + return 0; +} + +static struct css_driver io_subchannel_driver = { + .drv = { + .owner = THIS_MODULE, + .name = "io_subchannel", + }, + .subchannel_type = io_subchannel_ids, + .irq = io_subchannel_irq, + .sch_event = io_subchannel_sch_event, + .chp_event = io_subchannel_chp_event, + .probe = io_subchannel_probe, + .remove = io_subchannel_remove, + .shutdown = io_subchannel_shutdown, + .prepare = io_subchannel_prepare, + .settle = io_subchannel_settle, +}; + +int __init io_subchannel_init(void) +{ + int ret; + + timer_setup(&recovery_timer, recovery_func, 0); + ret = bus_register(&ccw_bus_type); + if (ret) + return ret; + ret = css_driver_register(&io_subchannel_driver); + if (ret) + bus_unregister(&ccw_bus_type); + + return ret; +} + + +/************************ device handling **************************/ + +static ssize_t +devtype_show (struct device *dev, struct device_attribute *attr, char *buf) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct ccw_device_id *id = &(cdev->id); + + if (id->dev_type != 0) + return sprintf(buf, "%04x/%02x\n", + id->dev_type, id->dev_model); + else + return sprintf(buf, "n/a\n"); +} + +static ssize_t +cutype_show (struct device *dev, struct device_attribute *attr, char *buf) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct ccw_device_id *id = &(cdev->id); + + return sprintf(buf, "%04x/%02x\n", + id->cu_type, id->cu_model); +} + +static ssize_t +modalias_show (struct device *dev, struct device_attribute *attr, char *buf) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct ccw_device_id *id = &(cdev->id); + int len; + + len = snprint_alias(buf, PAGE_SIZE, id, "\n"); + + return len > PAGE_SIZE ? PAGE_SIZE : len; +} + +static ssize_t +online_show (struct device *dev, struct device_attribute *attr, char *buf) +{ + struct ccw_device *cdev = to_ccwdev(dev); + + return sprintf(buf, cdev->online ? "1\n" : "0\n"); +} + +int ccw_device_is_orphan(struct ccw_device *cdev) +{ + return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent)); +} + +static void ccw_device_unregister(struct ccw_device *cdev) +{ + if (device_is_registered(&cdev->dev)) { + /* Undo device_add(). */ + device_del(&cdev->dev); + } + if (cdev->private->flags.initialized) { + cdev->private->flags.initialized = 0; + /* Release reference from device_initialize(). */ + put_device(&cdev->dev); + } +} + +static void io_subchannel_quiesce(struct subchannel *); + +/** + * ccw_device_set_offline() - disable a ccw device for I/O + * @cdev: target ccw device + * + * This function calls the driver's set_offline() function for @cdev, if + * given, and then disables @cdev. + * Returns: + * %0 on success and a negative error value on failure. + * Context: + * enabled, ccw device lock not held + */ +int ccw_device_set_offline(struct ccw_device *cdev) +{ + struct subchannel *sch; + int ret, state; + + if (!cdev) + return -ENODEV; + if (!cdev->online || !cdev->drv) + return -EINVAL; + + if (cdev->drv->set_offline) { + ret = cdev->drv->set_offline(cdev); + if (ret != 0) + return ret; + } + spin_lock_irq(cdev->ccwlock); + sch = to_subchannel(cdev->dev.parent); + cdev->online = 0; + /* Wait until a final state or DISCONNECTED is reached */ + while (!dev_fsm_final_state(cdev) && + cdev->private->state != DEV_STATE_DISCONNECTED) { + spin_unlock_irq(cdev->ccwlock); + wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || + cdev->private->state == DEV_STATE_DISCONNECTED)); + spin_lock_irq(cdev->ccwlock); + } + do { + ret = ccw_device_offline(cdev); + if (!ret) + break; + CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device " + "0.%x.%04x\n", ret, cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + if (ret != -EBUSY) + goto error; + state = cdev->private->state; + spin_unlock_irq(cdev->ccwlock); + io_subchannel_quiesce(sch); + spin_lock_irq(cdev->ccwlock); + cdev->private->state = state; + } while (ret == -EBUSY); + spin_unlock_irq(cdev->ccwlock); + wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || + cdev->private->state == DEV_STATE_DISCONNECTED)); + /* Inform the user if set offline failed. */ + if (cdev->private->state == DEV_STATE_BOXED) { + pr_warn("%s: The device entered boxed state while being set offline\n", + dev_name(&cdev->dev)); + } else if (cdev->private->state == DEV_STATE_NOT_OPER) { + pr_warn("%s: The device stopped operating while being set offline\n", + dev_name(&cdev->dev)); + } + /* Give up reference from ccw_device_set_online(). */ + put_device(&cdev->dev); + return 0; + +error: + cdev->private->state = DEV_STATE_OFFLINE; + dev_fsm_event(cdev, DEV_EVENT_NOTOPER); + spin_unlock_irq(cdev->ccwlock); + /* Give up reference from ccw_device_set_online(). */ + put_device(&cdev->dev); + return -ENODEV; +} + +/** + * ccw_device_set_online() - enable a ccw device for I/O + * @cdev: target ccw device + * + * This function first enables @cdev and then calls the driver's set_online() + * function for @cdev, if given. If set_online() returns an error, @cdev is + * disabled again. + * Returns: + * %0 on success and a negative error value on failure. + * Context: + * enabled, ccw device lock not held + */ +int ccw_device_set_online(struct ccw_device *cdev) +{ + int ret; + int ret2; + + if (!cdev) + return -ENODEV; + if (cdev->online || !cdev->drv) + return -EINVAL; + /* Hold on to an extra reference while device is online. */ + if (!get_device(&cdev->dev)) + return -ENODEV; + + spin_lock_irq(cdev->ccwlock); + ret = ccw_device_online(cdev); + spin_unlock_irq(cdev->ccwlock); + if (ret == 0) + wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); + else { + CIO_MSG_EVENT(0, "ccw_device_online returned %d, " + "device 0.%x.%04x\n", + ret, cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + /* Give up online reference since onlining failed. */ + put_device(&cdev->dev); + return ret; + } + spin_lock_irq(cdev->ccwlock); + /* Check if online processing was successful */ + if ((cdev->private->state != DEV_STATE_ONLINE) && + (cdev->private->state != DEV_STATE_W4SENSE)) { + spin_unlock_irq(cdev->ccwlock); + /* Inform the user that set online failed. */ + if (cdev->private->state == DEV_STATE_BOXED) { + pr_warn("%s: Setting the device online failed because it is boxed\n", + dev_name(&cdev->dev)); + } else if (cdev->private->state == DEV_STATE_NOT_OPER) { + pr_warn("%s: Setting the device online failed because it is not operational\n", + dev_name(&cdev->dev)); + } + /* Give up online reference since onlining failed. */ + put_device(&cdev->dev); + return -ENODEV; + } + spin_unlock_irq(cdev->ccwlock); + if (cdev->drv->set_online) + ret = cdev->drv->set_online(cdev); + if (ret) + goto rollback; + + spin_lock_irq(cdev->ccwlock); + cdev->online = 1; + spin_unlock_irq(cdev->ccwlock); + return 0; + +rollback: + spin_lock_irq(cdev->ccwlock); + /* Wait until a final state or DISCONNECTED is reached */ + while (!dev_fsm_final_state(cdev) && + cdev->private->state != DEV_STATE_DISCONNECTED) { + spin_unlock_irq(cdev->ccwlock); + wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || + cdev->private->state == DEV_STATE_DISCONNECTED)); + spin_lock_irq(cdev->ccwlock); + } + ret2 = ccw_device_offline(cdev); + if (ret2) + goto error; + spin_unlock_irq(cdev->ccwlock); + wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) || + cdev->private->state == DEV_STATE_DISCONNECTED)); + /* Give up online reference since onlining failed. */ + put_device(&cdev->dev); + return ret; + +error: + CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, " + "device 0.%x.%04x\n", + ret2, cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + cdev->private->state = DEV_STATE_OFFLINE; + spin_unlock_irq(cdev->ccwlock); + /* Give up online reference since onlining failed. */ + put_device(&cdev->dev); + return ret; +} + +static int online_store_handle_offline(struct ccw_device *cdev) +{ + if (cdev->private->state == DEV_STATE_DISCONNECTED) { + spin_lock_irq(cdev->ccwlock); + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL); + spin_unlock_irq(cdev->ccwlock); + return 0; + } + if (cdev->drv && cdev->drv->set_offline) + return ccw_device_set_offline(cdev); + return -EINVAL; +} + +static int online_store_recog_and_online(struct ccw_device *cdev) +{ + /* Do device recognition, if needed. */ + if (cdev->private->state == DEV_STATE_BOXED) { + spin_lock_irq(cdev->ccwlock); + ccw_device_recognition(cdev); + spin_unlock_irq(cdev->ccwlock); + wait_event(cdev->private->wait_q, + cdev->private->flags.recog_done); + if (cdev->private->state != DEV_STATE_OFFLINE) + /* recognition failed */ + return -EAGAIN; + } + if (cdev->drv && cdev->drv->set_online) + return ccw_device_set_online(cdev); + return -EINVAL; +} + +static int online_store_handle_online(struct ccw_device *cdev, int force) +{ + int ret; + + ret = online_store_recog_and_online(cdev); + if (ret && !force) + return ret; + if (force && cdev->private->state == DEV_STATE_BOXED) { + ret = ccw_device_stlck(cdev); + if (ret) + return ret; + if (cdev->id.cu_type == 0) + cdev->private->state = DEV_STATE_NOT_OPER; + ret = online_store_recog_and_online(cdev); + if (ret) + return ret; + } + return 0; +} + +static ssize_t online_store (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ccw_device *cdev = to_ccwdev(dev); + int force, ret; + unsigned long i; + + /* Prevent conflict between multiple on-/offline processing requests. */ + if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) + return -EAGAIN; + /* Prevent conflict between internal I/Os and on-/offline processing. */ + if (!dev_fsm_final_state(cdev) && + cdev->private->state != DEV_STATE_DISCONNECTED) { + ret = -EAGAIN; + goto out; + } + /* Prevent conflict between pending work and on-/offline processing.*/ + if (work_pending(&cdev->private->todo_work)) { + ret = -EAGAIN; + goto out; + } + if (!strncmp(buf, "force\n", count)) { + force = 1; + i = 1; + ret = 0; + } else { + force = 0; + ret = kstrtoul(buf, 16, &i); + } + if (ret) + goto out; + + device_lock(dev); + switch (i) { + case 0: + ret = online_store_handle_offline(cdev); + break; + case 1: + ret = online_store_handle_online(cdev, force); + break; + default: + ret = -EINVAL; + } + device_unlock(dev); + +out: + atomic_set(&cdev->private->onoff, 0); + return (ret < 0) ? ret : count; +} + +static ssize_t +available_show (struct device *dev, struct device_attribute *attr, char *buf) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct subchannel *sch; + + if (ccw_device_is_orphan(cdev)) + return sprintf(buf, "no device\n"); + switch (cdev->private->state) { + case DEV_STATE_BOXED: + return sprintf(buf, "boxed\n"); + case DEV_STATE_DISCONNECTED: + case DEV_STATE_DISCONNECTED_SENSE_ID: + case DEV_STATE_NOT_OPER: + sch = to_subchannel(dev->parent); + if (!sch->lpm) + return sprintf(buf, "no path\n"); + else + return sprintf(buf, "no device\n"); + default: + /* All other states considered fine. */ + return sprintf(buf, "good\n"); + } +} + +static ssize_t +initiate_logging(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct subchannel *sch = to_subchannel(dev); + int rc; + + rc = chsc_siosl(sch->schid); + if (rc < 0) { + pr_warn("Logging for subchannel 0.%x.%04x failed with errno=%d\n", + sch->schid.ssid, sch->schid.sch_no, rc); + return rc; + } + pr_notice("Logging for subchannel 0.%x.%04x was triggered\n", + sch->schid.ssid, sch->schid.sch_no); + return count; +} + +static ssize_t vpm_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct subchannel *sch = to_subchannel(dev); + + return sprintf(buf, "%02x\n", sch->vpm); +} + +static DEVICE_ATTR_RO(devtype); +static DEVICE_ATTR_RO(cutype); +static DEVICE_ATTR_RO(modalias); +static DEVICE_ATTR_RW(online); +static DEVICE_ATTR(availability, 0444, available_show, NULL); +static DEVICE_ATTR(logging, 0200, NULL, initiate_logging); +static DEVICE_ATTR_RO(vpm); + +static struct attribute *io_subchannel_attrs[] = { + &dev_attr_logging.attr, + &dev_attr_vpm.attr, + NULL, +}; + +static const struct attribute_group io_subchannel_attr_group = { + .attrs = io_subchannel_attrs, +}; + +static struct attribute * ccwdev_attrs[] = { + &dev_attr_devtype.attr, + &dev_attr_cutype.attr, + &dev_attr_modalias.attr, + &dev_attr_online.attr, + &dev_attr_cmb_enable.attr, + &dev_attr_availability.attr, + NULL, +}; + +static const struct attribute_group ccwdev_attr_group = { + .attrs = ccwdev_attrs, +}; + +static const struct attribute_group *ccwdev_attr_groups[] = { + &ccwdev_attr_group, + NULL, +}; + +static int ccw_device_add(struct ccw_device *cdev) +{ + struct device *dev = &cdev->dev; + + dev->bus = &ccw_bus_type; + return device_add(dev); +} + +static int match_dev_id(struct device *dev, void *data) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct ccw_dev_id *dev_id = data; + + return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id); +} + +/** + * get_ccwdev_by_dev_id() - obtain device from a ccw device id + * @dev_id: id of the device to be searched + * + * This function searches all devices attached to the ccw bus for a device + * matching @dev_id. + * Returns: + * If a device is found its reference count is increased and returned; + * else %NULL is returned. + */ +struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id) +{ + struct device *dev; + + dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id); + + return dev ? to_ccwdev(dev) : NULL; +} +EXPORT_SYMBOL_GPL(get_ccwdev_by_dev_id); + +static void ccw_device_do_unbind_bind(struct ccw_device *cdev) +{ + int ret; + + if (device_is_registered(&cdev->dev)) { + device_release_driver(&cdev->dev); + ret = device_attach(&cdev->dev); + WARN_ON(ret == -ENODEV); + } +} + +static void +ccw_device_release(struct device *dev) +{ + struct ccw_device *cdev; + + cdev = to_ccwdev(dev); + /* Release reference of parent subchannel. */ + put_device(cdev->dev.parent); + kfree(cdev->private); + kfree(cdev); +} + +static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch) +{ + struct ccw_device *cdev; + + cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); + if (cdev) { + cdev->private = kzalloc(sizeof(struct ccw_device_private), + GFP_KERNEL | GFP_DMA); + if (cdev->private) + return cdev; + } + kfree(cdev); + return ERR_PTR(-ENOMEM); +} + +static void ccw_device_todo(struct work_struct *work); + +static int io_subchannel_initialize_dev(struct subchannel *sch, + struct ccw_device *cdev) +{ + struct ccw_device_private *priv = cdev->private; + int ret; + + priv->cdev = cdev; + priv->int_class = IRQIO_CIO; + priv->state = DEV_STATE_NOT_OPER; + priv->dev_id.devno = sch->schib.pmcw.dev; + priv->dev_id.ssid = sch->schid.ssid; + + INIT_WORK(&priv->todo_work, ccw_device_todo); + INIT_LIST_HEAD(&priv->cmb_list); + init_waitqueue_head(&priv->wait_q); + timer_setup(&priv->timer, ccw_device_timeout, 0); + + atomic_set(&priv->onoff, 0); + cdev->ccwlock = sch->lock; + cdev->dev.parent = &sch->dev; + cdev->dev.release = ccw_device_release; + cdev->dev.groups = ccwdev_attr_groups; + /* Do first half of device_register. */ + device_initialize(&cdev->dev); + ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + if (ret) + goto out_put; + if (!get_device(&sch->dev)) { + ret = -ENODEV; + goto out_put; + } + priv->flags.initialized = 1; + spin_lock_irq(sch->lock); + sch_set_cdev(sch, cdev); + spin_unlock_irq(sch->lock); + return 0; + +out_put: + /* Release reference from device_initialize(). */ + put_device(&cdev->dev); + return ret; +} + +static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch) +{ + struct ccw_device *cdev; + int ret; + + cdev = io_subchannel_allocate_dev(sch); + if (!IS_ERR(cdev)) { + ret = io_subchannel_initialize_dev(sch, cdev); + if (ret) + cdev = ERR_PTR(ret); + } + return cdev; +} + +static void io_subchannel_recog(struct ccw_device *, struct subchannel *); + +static void sch_create_and_recog_new_device(struct subchannel *sch) +{ + struct ccw_device *cdev; + + /* Need to allocate a new ccw device. */ + cdev = io_subchannel_create_ccwdev(sch); + if (IS_ERR(cdev)) { + /* OK, we did everything we could... */ + css_sch_device_unregister(sch); + return; + } + /* Start recognition for the new ccw device. */ + io_subchannel_recog(cdev, sch); +} + +/* + * Register recognized device. + */ +static void io_subchannel_register(struct ccw_device *cdev) +{ + struct subchannel *sch; + int ret, adjust_init_count = 1; + unsigned long flags; + + sch = to_subchannel(cdev->dev.parent); + /* + * Check if subchannel is still registered. It may have become + * unregistered if a machine check hit us after finishing + * device recognition but before the register work could be + * queued. + */ + if (!device_is_registered(&sch->dev)) + goto out_err; + css_update_ssd_info(sch); + /* + * io_subchannel_register() will also be called after device + * recognition has been done for a boxed device (which will already + * be registered). We need to reprobe since we may now have sense id + * information. + */ + if (device_is_registered(&cdev->dev)) { + if (!cdev->drv) { + ret = device_reprobe(&cdev->dev); + if (ret) + /* We can't do much here. */ + CIO_MSG_EVENT(0, "device_reprobe() returned" + " %d for 0.%x.%04x\n", ret, + cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + } + adjust_init_count = 0; + goto out; + } + /* + * Now we know this subchannel will stay, we can throw + * our delayed uevent. + */ + if (dev_get_uevent_suppress(&sch->dev)) { + dev_set_uevent_suppress(&sch->dev, 0); + kobject_uevent(&sch->dev.kobj, KOBJ_ADD); + } + /* make it known to the system */ + ret = ccw_device_add(cdev); + if (ret) { + CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n", + cdev->private->dev_id.ssid, + cdev->private->dev_id.devno, ret); + spin_lock_irqsave(sch->lock, flags); + sch_set_cdev(sch, NULL); + spin_unlock_irqrestore(sch->lock, flags); + /* Release initial device reference. */ + put_device(&cdev->dev); + goto out_err; + } +out: + cdev->private->flags.recog_done = 1; + wake_up(&cdev->private->wait_q); +out_err: + if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count)) + wake_up(&ccw_device_init_wq); +} + +static void ccw_device_call_sch_unregister(struct ccw_device *cdev) +{ + struct subchannel *sch; + + /* Get subchannel reference for local processing. */ + if (!get_device(cdev->dev.parent)) + return; + sch = to_subchannel(cdev->dev.parent); + css_sch_device_unregister(sch); + /* Release subchannel reference for local processing. */ + put_device(&sch->dev); +} + +/* + * subchannel recognition done. Called from the state machine. + */ +void +io_subchannel_recog_done(struct ccw_device *cdev) +{ + if (css_init_done == 0) { + cdev->private->flags.recog_done = 1; + return; + } + switch (cdev->private->state) { + case DEV_STATE_BOXED: + /* Device did not respond in time. */ + case DEV_STATE_NOT_OPER: + cdev->private->flags.recog_done = 1; + /* Remove device found not operational. */ + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + if (atomic_dec_and_test(&ccw_device_init_count)) + wake_up(&ccw_device_init_wq); + break; + case DEV_STATE_OFFLINE: + /* + * We can't register the device in interrupt context so + * we schedule a work item. + */ + ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER); + break; + } +} + +static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) +{ + /* Increase counter of devices currently in recognition. */ + atomic_inc(&ccw_device_init_count); + + /* Start async. device sensing. */ + spin_lock_irq(sch->lock); + ccw_device_recognition(cdev); + spin_unlock_irq(sch->lock); +} + +static int ccw_device_move_to_sch(struct ccw_device *cdev, + struct subchannel *sch) +{ + struct subchannel *old_sch; + int rc, old_enabled = 0; + + old_sch = to_subchannel(cdev->dev.parent); + /* Obtain child reference for new parent. */ + if (!get_device(&sch->dev)) + return -ENODEV; + + if (!sch_is_pseudo_sch(old_sch)) { + spin_lock_irq(old_sch->lock); + old_enabled = old_sch->schib.pmcw.ena; + rc = 0; + if (old_enabled) + rc = cio_disable_subchannel(old_sch); + spin_unlock_irq(old_sch->lock); + if (rc == -EBUSY) { + /* Release child reference for new parent. */ + put_device(&sch->dev); + return rc; + } + } + + mutex_lock(&sch->reg_mutex); + rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV); + mutex_unlock(&sch->reg_mutex); + if (rc) { + CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n", + cdev->private->dev_id.ssid, + cdev->private->dev_id.devno, sch->schid.ssid, + sch->schib.pmcw.dev, rc); + if (old_enabled) { + /* Try to reenable the old subchannel. */ + spin_lock_irq(old_sch->lock); + cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch); + spin_unlock_irq(old_sch->lock); + } + /* Release child reference for new parent. */ + put_device(&sch->dev); + return rc; + } + /* Clean up old subchannel. */ + if (!sch_is_pseudo_sch(old_sch)) { + spin_lock_irq(old_sch->lock); + sch_set_cdev(old_sch, NULL); + spin_unlock_irq(old_sch->lock); + css_schedule_eval(old_sch->schid); + } + /* Release child reference for old parent. */ + put_device(&old_sch->dev); + /* Initialize new subchannel. */ + spin_lock_irq(sch->lock); + cdev->ccwlock = sch->lock; + if (!sch_is_pseudo_sch(sch)) + sch_set_cdev(sch, cdev); + spin_unlock_irq(sch->lock); + if (!sch_is_pseudo_sch(sch)) + css_update_ssd_info(sch); + return 0; +} + +static int ccw_device_move_to_orph(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct channel_subsystem *css = to_css(sch->dev.parent); + + return ccw_device_move_to_sch(cdev, css->pseudo_subchannel); +} + +static void io_subchannel_irq(struct subchannel *sch) +{ + struct ccw_device *cdev; + + cdev = sch_get_cdev(sch); + + CIO_TRACE_EVENT(6, "IRQ"); + CIO_TRACE_EVENT(6, dev_name(&sch->dev)); + if (cdev) + dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); + else + inc_irq_stat(IRQIO_CIO); +} + +void io_subchannel_init_config(struct subchannel *sch) +{ + memset(&sch->config, 0, sizeof(sch->config)); + sch->config.csense = 1; +} + +static void io_subchannel_init_fields(struct subchannel *sch) +{ + if (cio_is_console(sch->schid)) + sch->opm = 0xff; + else + sch->opm = chp_get_sch_opm(sch); + sch->lpm = sch->schib.pmcw.pam & sch->opm; + sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC; + + CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X" + " - PIM = %02X, PAM = %02X, POM = %02X\n", + sch->schib.pmcw.dev, sch->schid.ssid, + sch->schid.sch_no, sch->schib.pmcw.pim, + sch->schib.pmcw.pam, sch->schib.pmcw.pom); + + io_subchannel_init_config(sch); +} + +/* + * Note: We always return 0 so that we bind to the device even on error. + * This is needed so that our remove function is called on unregister. + */ +static int io_subchannel_probe(struct subchannel *sch) +{ + struct io_subchannel_private *io_priv; + struct ccw_device *cdev; + int rc; + + if (cio_is_console(sch->schid)) { + rc = sysfs_create_group(&sch->dev.kobj, + &io_subchannel_attr_group); + if (rc) + CIO_MSG_EVENT(0, "Failed to create io subchannel " + "attributes for subchannel " + "0.%x.%04x (rc=%d)\n", + sch->schid.ssid, sch->schid.sch_no, rc); + /* + * The console subchannel already has an associated ccw_device. + * Throw the delayed uevent for the subchannel, register + * the ccw_device and exit. + */ + if (dev_get_uevent_suppress(&sch->dev)) { + /* should always be the case for the console */ + dev_set_uevent_suppress(&sch->dev, 0); + kobject_uevent(&sch->dev.kobj, KOBJ_ADD); + } + cdev = sch_get_cdev(sch); + rc = ccw_device_add(cdev); + if (rc) { + /* Release online reference. */ + put_device(&cdev->dev); + goto out_schedule; + } + if (atomic_dec_and_test(&ccw_device_init_count)) + wake_up(&ccw_device_init_wq); + return 0; + } + io_subchannel_init_fields(sch); + rc = cio_commit_config(sch); + if (rc) + goto out_schedule; + rc = sysfs_create_group(&sch->dev.kobj, + &io_subchannel_attr_group); + if (rc) + goto out_schedule; + /* Allocate I/O subchannel private data. */ + io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); + if (!io_priv) + goto out_schedule; + + set_io_private(sch, io_priv); + css_schedule_eval(sch->schid); + return 0; + +out_schedule: + spin_lock_irq(sch->lock); + css_sched_sch_todo(sch, SCH_TODO_UNREG); + spin_unlock_irq(sch->lock); + return 0; +} + +static int io_subchannel_remove(struct subchannel *sch) +{ + struct io_subchannel_private *io_priv = to_io_private(sch); + struct ccw_device *cdev; + + cdev = sch_get_cdev(sch); + if (!cdev) + goto out_free; + + ccw_device_unregister(cdev); + spin_lock_irq(sch->lock); + sch_set_cdev(sch, NULL); + set_io_private(sch, NULL); + spin_unlock_irq(sch->lock); +out_free: + kfree(io_priv); + sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group); + return 0; +} + +static void io_subchannel_verify(struct subchannel *sch) +{ + struct ccw_device *cdev; + + cdev = sch_get_cdev(sch); + if (cdev) + dev_fsm_event(cdev, DEV_EVENT_VERIFY); +} + +static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask) +{ + struct ccw_device *cdev; + + cdev = sch_get_cdev(sch); + if (!cdev) + return; + if (cio_update_schib(sch)) + goto err; + /* Check for I/O on path. */ + if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask) + goto out; + if (cdev->private->state == DEV_STATE_ONLINE) { + ccw_device_kill_io(cdev); + goto out; + } + if (cio_clear(sch)) + goto err; +out: + /* Trigger path verification. */ + dev_fsm_event(cdev, DEV_EVENT_VERIFY); + return; + +err: + dev_fsm_event(cdev, DEV_EVENT_NOTOPER); +} + +static int io_subchannel_chp_event(struct subchannel *sch, + struct chp_link *link, int event) +{ + struct ccw_device *cdev = sch_get_cdev(sch); + int mask; + + mask = chp_ssd_get_mask(&sch->ssd_info, link); + if (!mask) + return 0; + switch (event) { + case CHP_VARY_OFF: + sch->opm &= ~mask; + sch->lpm &= ~mask; + if (cdev) + cdev->private->path_gone_mask |= mask; + io_subchannel_terminate_path(sch, mask); + break; + case CHP_VARY_ON: + sch->opm |= mask; + sch->lpm |= mask; + if (cdev) + cdev->private->path_new_mask |= mask; + io_subchannel_verify(sch); + break; + case CHP_OFFLINE: + if (cio_update_schib(sch)) + return -ENODEV; + if (cdev) + cdev->private->path_gone_mask |= mask; + io_subchannel_terminate_path(sch, mask); + break; + case CHP_ONLINE: + if (cio_update_schib(sch)) + return -ENODEV; + sch->lpm |= mask & sch->opm; + if (cdev) + cdev->private->path_new_mask |= mask; + io_subchannel_verify(sch); + break; + } + return 0; +} + +static void io_subchannel_quiesce(struct subchannel *sch) +{ + struct ccw_device *cdev; + int ret; + + spin_lock_irq(sch->lock); + cdev = sch_get_cdev(sch); + if (cio_is_console(sch->schid)) + goto out_unlock; + if (!sch->schib.pmcw.ena) + goto out_unlock; + ret = cio_disable_subchannel(sch); + if (ret != -EBUSY) + goto out_unlock; + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO)); + while (ret == -EBUSY) { + cdev->private->state = DEV_STATE_QUIESCE; + cdev->private->iretry = 255; + ret = ccw_device_cancel_halt_clear(cdev); + if (ret == -EBUSY) { + ccw_device_set_timeout(cdev, HZ/10); + spin_unlock_irq(sch->lock); + wait_event(cdev->private->wait_q, + cdev->private->state != DEV_STATE_QUIESCE); + spin_lock_irq(sch->lock); + } + ret = cio_disable_subchannel(sch); + } +out_unlock: + spin_unlock_irq(sch->lock); +} + +static void io_subchannel_shutdown(struct subchannel *sch) +{ + io_subchannel_quiesce(sch); +} + +static int device_is_disconnected(struct ccw_device *cdev) +{ + if (!cdev) + return 0; + return (cdev->private->state == DEV_STATE_DISCONNECTED || + cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); +} + +static int recovery_check(struct device *dev, void *data) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct subchannel *sch; + int *redo = data; + + spin_lock_irq(cdev->ccwlock); + switch (cdev->private->state) { + case DEV_STATE_ONLINE: + sch = to_subchannel(cdev->dev.parent); + if ((sch->schib.pmcw.pam & sch->opm) == sch->vpm) + break; + /* fall through */ + case DEV_STATE_DISCONNECTED: + CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n", + cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + dev_fsm_event(cdev, DEV_EVENT_VERIFY); + *redo = 1; + break; + case DEV_STATE_DISCONNECTED_SENSE_ID: + *redo = 1; + break; + } + spin_unlock_irq(cdev->ccwlock); + + return 0; +} + +static void recovery_work_func(struct work_struct *unused) +{ + int redo = 0; + + bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check); + if (redo) { + spin_lock_irq(&recovery_lock); + if (!timer_pending(&recovery_timer)) { + if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1) + recovery_phase++; + mod_timer(&recovery_timer, jiffies + + recovery_delay[recovery_phase] * HZ); + } + spin_unlock_irq(&recovery_lock); + } else + CIO_MSG_EVENT(3, "recovery: end\n"); +} + +static DECLARE_WORK(recovery_work, recovery_work_func); + +static void recovery_func(struct timer_list *unused) +{ + /* + * We can't do our recovery in softirq context and it's not + * performance critical, so we schedule it. + */ + schedule_work(&recovery_work); +} + +void ccw_device_schedule_recovery(void) +{ + unsigned long flags; + + CIO_MSG_EVENT(3, "recovery: schedule\n"); + spin_lock_irqsave(&recovery_lock, flags); + if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) { + recovery_phase = 0; + mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ); + } + spin_unlock_irqrestore(&recovery_lock, flags); +} + +static int purge_fn(struct device *dev, void *data) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct ccw_dev_id *id = &cdev->private->dev_id; + + spin_lock_irq(cdev->ccwlock); + if (is_blacklisted(id->ssid, id->devno) && + (cdev->private->state == DEV_STATE_OFFLINE) && + (atomic_cmpxchg(&cdev->private->onoff, 0, 1) == 0)) { + CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid, + id->devno); + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + atomic_set(&cdev->private->onoff, 0); + } + spin_unlock_irq(cdev->ccwlock); + /* Abort loop in case of pending signal. */ + if (signal_pending(current)) + return -EINTR; + + return 0; +} + +/** + * ccw_purge_blacklisted - purge unused, blacklisted devices + * + * Unregister all ccw devices that are offline and on the blacklist. + */ +int ccw_purge_blacklisted(void) +{ + CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n"); + bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn); + return 0; +} + +void ccw_device_set_disconnected(struct ccw_device *cdev) +{ + if (!cdev) + return; + ccw_device_set_timeout(cdev, 0); + cdev->private->flags.fake_irb = 0; + cdev->private->state = DEV_STATE_DISCONNECTED; + if (cdev->online) + ccw_device_schedule_recovery(); +} + +void ccw_device_set_notoper(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + CIO_TRACE_EVENT(2, "notoper"); + CIO_TRACE_EVENT(2, dev_name(&sch->dev)); + ccw_device_set_timeout(cdev, 0); + cio_disable_subchannel(sch); + cdev->private->state = DEV_STATE_NOT_OPER; +} + +enum io_sch_action { + IO_SCH_UNREG, + IO_SCH_ORPH_UNREG, + IO_SCH_ATTACH, + IO_SCH_UNREG_ATTACH, + IO_SCH_ORPH_ATTACH, + IO_SCH_REPROBE, + IO_SCH_VERIFY, + IO_SCH_DISC, + IO_SCH_NOP, +}; + +static enum io_sch_action sch_get_action(struct subchannel *sch) +{ + struct ccw_device *cdev; + + cdev = sch_get_cdev(sch); + if (cio_update_schib(sch)) { + /* Not operational. */ + if (!cdev) + return IO_SCH_UNREG; + if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) + return IO_SCH_UNREG; + return IO_SCH_ORPH_UNREG; + } + /* Operational. */ + if (!cdev) + return IO_SCH_ATTACH; + if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { + if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) + return IO_SCH_UNREG_ATTACH; + return IO_SCH_ORPH_ATTACH; + } + if ((sch->schib.pmcw.pam & sch->opm) == 0) { + if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) + return IO_SCH_UNREG; + return IO_SCH_DISC; + } + if (device_is_disconnected(cdev)) + return IO_SCH_REPROBE; + if (cdev->online && !cdev->private->flags.resuming) + return IO_SCH_VERIFY; + if (cdev->private->state == DEV_STATE_NOT_OPER) + return IO_SCH_UNREG_ATTACH; + return IO_SCH_NOP; +} + +/** + * io_subchannel_sch_event - process subchannel event + * @sch: subchannel + * @process: non-zero if function is called in process context + * + * An unspecified event occurred for this subchannel. Adjust data according + * to the current operational state of the subchannel and device. Return + * zero when the event has been handled sufficiently or -EAGAIN when this + * function should be called again in process context. + */ +static int io_subchannel_sch_event(struct subchannel *sch, int process) +{ + unsigned long flags; + struct ccw_device *cdev; + struct ccw_dev_id dev_id; + enum io_sch_action action; + int rc = -EAGAIN; + + spin_lock_irqsave(sch->lock, flags); + if (!device_is_registered(&sch->dev)) + goto out_unlock; + if (work_pending(&sch->todo_work)) + goto out_unlock; + cdev = sch_get_cdev(sch); + if (cdev && work_pending(&cdev->private->todo_work)) + goto out_unlock; + action = sch_get_action(sch); + CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n", + sch->schid.ssid, sch->schid.sch_no, process, + action); + /* Perform immediate actions while holding the lock. */ + switch (action) { + case IO_SCH_REPROBE: + /* Trigger device recognition. */ + ccw_device_trigger_reprobe(cdev); + rc = 0; + goto out_unlock; + case IO_SCH_VERIFY: + /* Trigger path verification. */ + io_subchannel_verify(sch); + rc = 0; + goto out_unlock; + case IO_SCH_DISC: + ccw_device_set_disconnected(cdev); + rc = 0; + goto out_unlock; + case IO_SCH_ORPH_UNREG: + case IO_SCH_ORPH_ATTACH: + ccw_device_set_disconnected(cdev); + break; + case IO_SCH_UNREG_ATTACH: + case IO_SCH_UNREG: + if (!cdev) + break; + if (cdev->private->state == DEV_STATE_SENSE_ID) { + /* + * Note: delayed work triggered by this event + * and repeated calls to sch_event are synchronized + * by the above check for work_pending(cdev). + */ + dev_fsm_event(cdev, DEV_EVENT_NOTOPER); + } else + ccw_device_set_notoper(cdev); + break; + case IO_SCH_NOP: + rc = 0; + goto out_unlock; + default: + break; + } + spin_unlock_irqrestore(sch->lock, flags); + /* All other actions require process context. */ + if (!process) + goto out; + /* Handle attached ccw device. */ + switch (action) { + case IO_SCH_ORPH_UNREG: + case IO_SCH_ORPH_ATTACH: + /* Move ccw device to orphanage. */ + rc = ccw_device_move_to_orph(cdev); + if (rc) + goto out; + break; + case IO_SCH_UNREG_ATTACH: + spin_lock_irqsave(sch->lock, flags); + if (cdev->private->flags.resuming) { + /* Device will be handled later. */ + rc = 0; + goto out_unlock; + } + sch_set_cdev(sch, NULL); + spin_unlock_irqrestore(sch->lock, flags); + /* Unregister ccw device. */ + ccw_device_unregister(cdev); + break; + default: + break; + } + /* Handle subchannel. */ + switch (action) { + case IO_SCH_ORPH_UNREG: + case IO_SCH_UNREG: + if (!cdev || !cdev->private->flags.resuming) + css_sch_device_unregister(sch); + break; + case IO_SCH_ORPH_ATTACH: + case IO_SCH_UNREG_ATTACH: + case IO_SCH_ATTACH: + dev_id.ssid = sch->schid.ssid; + dev_id.devno = sch->schib.pmcw.dev; + cdev = get_ccwdev_by_dev_id(&dev_id); + if (!cdev) { + sch_create_and_recog_new_device(sch); + break; + } + rc = ccw_device_move_to_sch(cdev, sch); + if (rc) { + /* Release reference from get_ccwdev_by_dev_id() */ + put_device(&cdev->dev); + goto out; + } + spin_lock_irqsave(sch->lock, flags); + ccw_device_trigger_reprobe(cdev); + spin_unlock_irqrestore(sch->lock, flags); + /* Release reference from get_ccwdev_by_dev_id() */ + put_device(&cdev->dev); + break; + default: + break; + } + return 0; + +out_unlock: + spin_unlock_irqrestore(sch->lock, flags); +out: + return rc; +} + +static void ccw_device_set_int_class(struct ccw_device *cdev) +{ + struct ccw_driver *cdrv = cdev->drv; + + /* Note: we interpret class 0 in this context as an uninitialized + * field since it translates to a non-I/O interrupt class. */ + if (cdrv->int_class != 0) + cdev->private->int_class = cdrv->int_class; + else + cdev->private->int_class = IRQIO_CIO; +} + +#ifdef CONFIG_CCW_CONSOLE +int __init ccw_device_enable_console(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + int rc; + + if (!cdev->drv || !cdev->handler) + return -EINVAL; + + io_subchannel_init_fields(sch); + rc = cio_commit_config(sch); + if (rc) + return rc; + sch->driver = &io_subchannel_driver; + io_subchannel_recog(cdev, sch); + /* Now wait for the async. recognition to come to an end. */ + spin_lock_irq(cdev->ccwlock); + while (!dev_fsm_final_state(cdev)) + ccw_device_wait_idle(cdev); + + /* Hold on to an extra reference while device is online. */ + get_device(&cdev->dev); + rc = ccw_device_online(cdev); + if (rc) + goto out_unlock; + + while (!dev_fsm_final_state(cdev)) + ccw_device_wait_idle(cdev); + + if (cdev->private->state == DEV_STATE_ONLINE) + cdev->online = 1; + else + rc = -EIO; +out_unlock: + spin_unlock_irq(cdev->ccwlock); + if (rc) /* Give up online reference since onlining failed. */ + put_device(&cdev->dev); + return rc; +} + +struct ccw_device * __init ccw_device_create_console(struct ccw_driver *drv) +{ + struct io_subchannel_private *io_priv; + struct ccw_device *cdev; + struct subchannel *sch; + + sch = cio_probe_console(); + if (IS_ERR(sch)) + return ERR_CAST(sch); + + io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA); + if (!io_priv) { + put_device(&sch->dev); + return ERR_PTR(-ENOMEM); + } + set_io_private(sch, io_priv); + cdev = io_subchannel_create_ccwdev(sch); + if (IS_ERR(cdev)) { + put_device(&sch->dev); + kfree(io_priv); + return cdev; + } + cdev->drv = drv; + ccw_device_set_int_class(cdev); + return cdev; +} + +void __init ccw_device_destroy_console(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct io_subchannel_private *io_priv = to_io_private(sch); + + set_io_private(sch, NULL); + put_device(&sch->dev); + put_device(&cdev->dev); + kfree(io_priv); +} + +/** + * ccw_device_wait_idle() - busy wait for device to become idle + * @cdev: ccw device + * + * Poll until activity control is zero, that is, no function or data + * transfer is pending/active. + * Called with device lock being held. + */ +void ccw_device_wait_idle(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + while (1) { + cio_tsch(sch); + if (sch->schib.scsw.cmd.actl == 0) + break; + udelay_simple(100); + } +} + +static int ccw_device_pm_restore(struct device *dev); + +int ccw_device_force_console(struct ccw_device *cdev) +{ + return ccw_device_pm_restore(&cdev->dev); +} +EXPORT_SYMBOL_GPL(ccw_device_force_console); +#endif + +/* + * get ccw_device matching the busid, but only if owned by cdrv + */ +static int +__ccwdev_check_busid(struct device *dev, void *id) +{ + char *bus_id; + + bus_id = id; + + return (strcmp(bus_id, dev_name(dev)) == 0); +} + + +/** + * get_ccwdev_by_busid() - obtain device from a bus id + * @cdrv: driver the device is owned by + * @bus_id: bus id of the device to be searched + * + * This function searches all devices owned by @cdrv for a device with a bus + * id matching @bus_id. + * Returns: + * If a match is found, its reference count of the found device is increased + * and it is returned; else %NULL is returned. + */ +struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, + const char *bus_id) +{ + struct device *dev; + + dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id, + __ccwdev_check_busid); + + return dev ? to_ccwdev(dev) : NULL; +} + +/************************** device driver handling ************************/ + +/* This is the implementation of the ccw_driver class. The probe, remove + * and release methods are initially very similar to the device_driver + * implementations, with the difference that they have ccw_device + * arguments. + * + * A ccw driver also contains the information that is needed for + * device matching. + */ +static int +ccw_device_probe (struct device *dev) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct ccw_driver *cdrv = to_ccwdrv(dev->driver); + int ret; + + cdev->drv = cdrv; /* to let the driver call _set_online */ + ccw_device_set_int_class(cdev); + ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; + if (ret) { + cdev->drv = NULL; + cdev->private->int_class = IRQIO_CIO; + return ret; + } + + return 0; +} + +static int ccw_device_remove(struct device *dev) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct ccw_driver *cdrv = cdev->drv; + struct subchannel *sch; + int ret; + + if (cdrv->remove) + cdrv->remove(cdev); + + spin_lock_irq(cdev->ccwlock); + if (cdev->online) { + cdev->online = 0; + ret = ccw_device_offline(cdev); + spin_unlock_irq(cdev->ccwlock); + if (ret == 0) + wait_event(cdev->private->wait_q, + dev_fsm_final_state(cdev)); + else + CIO_MSG_EVENT(0, "ccw_device_offline returned %d, " + "device 0.%x.%04x\n", + ret, cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + /* Give up reference obtained in ccw_device_set_online(). */ + put_device(&cdev->dev); + spin_lock_irq(cdev->ccwlock); + } + ccw_device_set_timeout(cdev, 0); + cdev->drv = NULL; + cdev->private->int_class = IRQIO_CIO; + sch = to_subchannel(cdev->dev.parent); + spin_unlock_irq(cdev->ccwlock); + io_subchannel_quiesce(sch); + __disable_cmf(cdev); + + return 0; +} + +static void ccw_device_shutdown(struct device *dev) +{ + struct ccw_device *cdev; + + cdev = to_ccwdev(dev); + if (cdev->drv && cdev->drv->shutdown) + cdev->drv->shutdown(cdev); + __disable_cmf(cdev); +} + +static int ccw_device_pm_prepare(struct device *dev) +{ + struct ccw_device *cdev = to_ccwdev(dev); + + if (work_pending(&cdev->private->todo_work)) + return -EAGAIN; + /* Fail while device is being set online/offline. */ + if (atomic_read(&cdev->private->onoff)) + return -EAGAIN; + + if (cdev->online && cdev->drv && cdev->drv->prepare) + return cdev->drv->prepare(cdev); + + return 0; +} + +static void ccw_device_pm_complete(struct device *dev) +{ + struct ccw_device *cdev = to_ccwdev(dev); + + if (cdev->online && cdev->drv && cdev->drv->complete) + cdev->drv->complete(cdev); +} + +static int ccw_device_pm_freeze(struct device *dev) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct subchannel *sch = to_subchannel(cdev->dev.parent); + int ret, cm_enabled; + + /* Fail suspend while device is in transistional state. */ + if (!dev_fsm_final_state(cdev)) + return -EAGAIN; + if (!cdev->online) + return 0; + if (cdev->drv && cdev->drv->freeze) { + ret = cdev->drv->freeze(cdev); + if (ret) + return ret; + } + + spin_lock_irq(sch->lock); + cm_enabled = cdev->private->cmb != NULL; + spin_unlock_irq(sch->lock); + if (cm_enabled) { + /* Don't have the css write on memory. */ + ret = ccw_set_cmf(cdev, 0); + if (ret) + return ret; + } + /* From here on, disallow device driver I/O. */ + spin_lock_irq(sch->lock); + ret = cio_disable_subchannel(sch); + spin_unlock_irq(sch->lock); + + return ret; +} + +static int ccw_device_pm_thaw(struct device *dev) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct subchannel *sch = to_subchannel(cdev->dev.parent); + int ret, cm_enabled; + + if (!cdev->online) + return 0; + + spin_lock_irq(sch->lock); + /* Allow device driver I/O again. */ + ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); + cm_enabled = cdev->private->cmb != NULL; + spin_unlock_irq(sch->lock); + if (ret) + return ret; + + if (cm_enabled) { + ret = ccw_set_cmf(cdev, 1); + if (ret) + return ret; + } + + if (cdev->drv && cdev->drv->thaw) + ret = cdev->drv->thaw(cdev); + + return ret; +} + +static void __ccw_device_pm_restore(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + spin_lock_irq(sch->lock); + if (cio_is_console(sch->schid)) { + cio_enable_subchannel(sch, (u32)(addr_t)sch); + goto out_unlock; + } + /* + * While we were sleeping, devices may have gone or become + * available again. Kick re-detection. + */ + cdev->private->flags.resuming = 1; + cdev->private->path_new_mask = LPM_ANYPATH; + css_sched_sch_todo(sch, SCH_TODO_EVAL); + spin_unlock_irq(sch->lock); + css_wait_for_slow_path(); + + /* cdev may have been moved to a different subchannel. */ + sch = to_subchannel(cdev->dev.parent); + spin_lock_irq(sch->lock); + if (cdev->private->state != DEV_STATE_ONLINE && + cdev->private->state != DEV_STATE_OFFLINE) + goto out_unlock; + + ccw_device_recognition(cdev); + spin_unlock_irq(sch->lock); + wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) || + cdev->private->state == DEV_STATE_DISCONNECTED); + spin_lock_irq(sch->lock); + +out_unlock: + cdev->private->flags.resuming = 0; + spin_unlock_irq(sch->lock); +} + +static int resume_handle_boxed(struct ccw_device *cdev) +{ + cdev->private->state = DEV_STATE_BOXED; + if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK) + return 0; + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + return -ENODEV; +} + +static int resume_handle_disc(struct ccw_device *cdev) +{ + cdev->private->state = DEV_STATE_DISCONNECTED; + if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK) + return 0; + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + return -ENODEV; +} + +static int ccw_device_pm_restore(struct device *dev) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct subchannel *sch; + int ret = 0; + + __ccw_device_pm_restore(cdev); + sch = to_subchannel(cdev->dev.parent); + spin_lock_irq(sch->lock); + if (cio_is_console(sch->schid)) + goto out_restore; + + /* check recognition results */ + switch (cdev->private->state) { + case DEV_STATE_OFFLINE: + case DEV_STATE_ONLINE: + cdev->private->flags.donotify = 0; + break; + case DEV_STATE_BOXED: + ret = resume_handle_boxed(cdev); + if (ret) + goto out_unlock; + goto out_restore; + default: + ret = resume_handle_disc(cdev); + if (ret) + goto out_unlock; + goto out_restore; + } + /* check if the device type has changed */ + if (!ccw_device_test_sense_data(cdev)) { + ccw_device_update_sense_data(cdev); + ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); + ret = -ENODEV; + goto out_unlock; + } + if (!cdev->online) + goto out_unlock; + + if (ccw_device_online(cdev)) { + ret = resume_handle_disc(cdev); + if (ret) + goto out_unlock; + goto out_restore; + } + spin_unlock_irq(sch->lock); + wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); + spin_lock_irq(sch->lock); + + if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) { + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + ret = -ENODEV; + goto out_unlock; + } + + /* reenable cmf, if needed */ + if (cdev->private->cmb) { + spin_unlock_irq(sch->lock); + ret = ccw_set_cmf(cdev, 1); + spin_lock_irq(sch->lock); + if (ret) { + CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " + "(rc=%d)\n", cdev->private->dev_id.ssid, + cdev->private->dev_id.devno, ret); + ret = 0; + } + } + +out_restore: + spin_unlock_irq(sch->lock); + if (cdev->online && cdev->drv && cdev->drv->restore) + ret = cdev->drv->restore(cdev); + return ret; + +out_unlock: + spin_unlock_irq(sch->lock); + return ret; +} + +static const struct dev_pm_ops ccw_pm_ops = { + .prepare = ccw_device_pm_prepare, + .complete = ccw_device_pm_complete, + .freeze = ccw_device_pm_freeze, + .thaw = ccw_device_pm_thaw, + .restore = ccw_device_pm_restore, +}; + +static struct bus_type ccw_bus_type = { + .name = "ccw", + .match = ccw_bus_match, + .uevent = ccw_uevent, + .probe = ccw_device_probe, + .remove = ccw_device_remove, + .shutdown = ccw_device_shutdown, + .pm = &ccw_pm_ops, +}; + +/** + * ccw_driver_register() - register a ccw driver + * @cdriver: driver to be registered + * + * This function is mainly a wrapper around driver_register(). + * Returns: + * %0 on success and a negative error value on failure. + */ +int ccw_driver_register(struct ccw_driver *cdriver) +{ + struct device_driver *drv = &cdriver->driver; + + drv->bus = &ccw_bus_type; + + return driver_register(drv); +} + +/** + * ccw_driver_unregister() - deregister a ccw driver + * @cdriver: driver to be deregistered + * + * This function is mainly a wrapper around driver_unregister(). + */ +void ccw_driver_unregister(struct ccw_driver *cdriver) +{ + driver_unregister(&cdriver->driver); +} + +static void ccw_device_todo(struct work_struct *work) +{ + struct ccw_device_private *priv; + struct ccw_device *cdev; + struct subchannel *sch; + enum cdev_todo todo; + + priv = container_of(work, struct ccw_device_private, todo_work); + cdev = priv->cdev; + sch = to_subchannel(cdev->dev.parent); + /* Find out todo. */ + spin_lock_irq(cdev->ccwlock); + todo = priv->todo; + priv->todo = CDEV_TODO_NOTHING; + CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n", + priv->dev_id.ssid, priv->dev_id.devno, todo); + spin_unlock_irq(cdev->ccwlock); + /* Perform todo. */ + switch (todo) { + case CDEV_TODO_ENABLE_CMF: + cmf_reenable(cdev); + break; + case CDEV_TODO_REBIND: + ccw_device_do_unbind_bind(cdev); + break; + case CDEV_TODO_REGISTER: + io_subchannel_register(cdev); + break; + case CDEV_TODO_UNREG_EVAL: + if (!sch_is_pseudo_sch(sch)) + css_schedule_eval(sch->schid); + /* fall-through */ + case CDEV_TODO_UNREG: + if (sch_is_pseudo_sch(sch)) + ccw_device_unregister(cdev); + else + ccw_device_call_sch_unregister(cdev); + break; + default: + break; + } + /* Release workqueue ref. */ + put_device(&cdev->dev); +} + +/** + * ccw_device_sched_todo - schedule ccw device operation + * @cdev: ccw device + * @todo: todo + * + * Schedule the operation identified by @todo to be performed on the slow path + * workqueue. Do nothing if another operation with higher priority is already + * scheduled. Needs to be called with ccwdev lock held. + */ +void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo) +{ + CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n", + cdev->private->dev_id.ssid, cdev->private->dev_id.devno, + todo); + if (cdev->private->todo >= todo) + return; + cdev->private->todo = todo; + /* Get workqueue ref. */ + if (!get_device(&cdev->dev)) + return; + if (!queue_work(cio_work_q, &cdev->private->todo_work)) { + /* Already queued, release workqueue ref. */ + put_device(&cdev->dev); + } +} + +/** + * ccw_device_siosl() - initiate logging + * @cdev: ccw device + * + * This function is used to invoke model-dependent logging within the channel + * subsystem. + */ +int ccw_device_siosl(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + return chsc_siosl(sch->schid); +} +EXPORT_SYMBOL_GPL(ccw_device_siosl); + +EXPORT_SYMBOL(ccw_device_set_online); +EXPORT_SYMBOL(ccw_device_set_offline); +EXPORT_SYMBOL(ccw_driver_register); +EXPORT_SYMBOL(ccw_driver_unregister); +EXPORT_SYMBOL(get_ccwdev_by_busid); diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h new file mode 100644 index 000000000..f5c427ec2 --- /dev/null +++ b/drivers/s390/cio/device.h @@ -0,0 +1,149 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef S390_DEVICE_H +#define S390_DEVICE_H + +#include +#include +#include +#include +#include +#include +#include "io_sch.h" + +/* + * states of the device statemachine + */ +enum dev_state { + DEV_STATE_NOT_OPER, + DEV_STATE_SENSE_ID, + DEV_STATE_OFFLINE, + DEV_STATE_VERIFY, + DEV_STATE_ONLINE, + DEV_STATE_W4SENSE, + DEV_STATE_DISBAND_PGID, + DEV_STATE_BOXED, + /* states to wait for i/o completion before doing something */ + DEV_STATE_TIMEOUT_KILL, + DEV_STATE_QUIESCE, + /* special states for devices gone not operational */ + DEV_STATE_DISCONNECTED, + DEV_STATE_DISCONNECTED_SENSE_ID, + DEV_STATE_CMFCHANGE, + DEV_STATE_CMFUPDATE, + DEV_STATE_STEAL_LOCK, + /* last element! */ + NR_DEV_STATES +}; + +/* + * asynchronous events of the device statemachine + */ +enum dev_event { + DEV_EVENT_NOTOPER, + DEV_EVENT_INTERRUPT, + DEV_EVENT_TIMEOUT, + DEV_EVENT_VERIFY, + /* last element! */ + NR_DEV_EVENTS +}; + +struct ccw_device; + +/* + * action called through jumptable + */ +typedef void (fsm_func_t)(struct ccw_device *, enum dev_event); +extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS]; + +static inline void +dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event) +{ + int state = cdev->private->state; + + if (dev_event == DEV_EVENT_INTERRUPT) { + if (state == DEV_STATE_ONLINE) + inc_irq_stat(cdev->private->int_class); + else if (state != DEV_STATE_CMFCHANGE && + state != DEV_STATE_CMFUPDATE) + inc_irq_stat(IRQIO_CIO); + } + dev_jumptable[state][dev_event](cdev, dev_event); +} + +/* + * Delivers 1 if the device state is final. + */ +static inline int +dev_fsm_final_state(struct ccw_device *cdev) +{ + return (cdev->private->state == DEV_STATE_NOT_OPER || + cdev->private->state == DEV_STATE_OFFLINE || + cdev->private->state == DEV_STATE_ONLINE || + cdev->private->state == DEV_STATE_BOXED); +} + +int __init io_subchannel_init(void); + +void io_subchannel_recog_done(struct ccw_device *cdev); +void io_subchannel_init_config(struct subchannel *sch); + +int ccw_device_cancel_halt_clear(struct ccw_device *); + +int ccw_device_is_orphan(struct ccw_device *); + +void ccw_device_recognition(struct ccw_device *); +int ccw_device_online(struct ccw_device *); +int ccw_device_offline(struct ccw_device *); +void ccw_device_update_sense_data(struct ccw_device *); +int ccw_device_test_sense_data(struct ccw_device *); +void ccw_device_schedule_sch_unregister(struct ccw_device *); +int ccw_purge_blacklisted(void); +void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo); +struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id); + +/* Function prototypes for device status and basic sense stuff. */ +void ccw_device_accumulate_irb(struct ccw_device *, struct irb *); +void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *); +int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *); +int ccw_device_do_sense(struct ccw_device *, struct irb *); + +/* Function prototype for internal request handling. */ +int lpm_adjust(int lpm, int mask); +void ccw_request_start(struct ccw_device *); +int ccw_request_cancel(struct ccw_device *cdev); +void ccw_request_handler(struct ccw_device *cdev); +void ccw_request_timeout(struct ccw_device *cdev); +void ccw_request_notoper(struct ccw_device *cdev); + +/* Function prototypes for sense id stuff. */ +void ccw_device_sense_id_start(struct ccw_device *); +void ccw_device_sense_id_done(struct ccw_device *, int); + +/* Function prototypes for path grouping stuff. */ +void ccw_device_verify_start(struct ccw_device *); +void ccw_device_verify_done(struct ccw_device *, int); + +void ccw_device_disband_start(struct ccw_device *); +void ccw_device_disband_done(struct ccw_device *, int); + +int ccw_device_stlck(struct ccw_device *); + +/* Helper function for machine check handling. */ +void ccw_device_trigger_reprobe(struct ccw_device *); +void ccw_device_kill_io(struct ccw_device *); +int ccw_device_notify(struct ccw_device *, int); +void ccw_device_set_disconnected(struct ccw_device *cdev); +void ccw_device_set_notoper(struct ccw_device *cdev); + +void ccw_device_timeout(struct timer_list *t); +void ccw_device_set_timeout(struct ccw_device *, int); +void ccw_device_schedule_recovery(void); + +/* Channel measurement facility related */ +void retry_set_schib(struct ccw_device *cdev); +void cmf_retry_copy_block(struct ccw_device *); +int cmf_reenable(struct ccw_device *); +void cmf_reactivate(void); +int ccw_set_cmf(struct ccw_device *cdev, int enable); +extern struct device_attribute dev_attr_cmb_enable; +#endif diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c new file mode 100644 index 000000000..9169af7db --- /dev/null +++ b/drivers/s390/cio/device_fsm.c @@ -0,0 +1,1125 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * finite state machine for device handling + * + * Copyright IBM Corp. 2002, 2008 + * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) + * Martin Schwidefsky (schwidefsky@de.ibm.com) + */ + +#include +#include +#include +#include + +#include +#include +#include + +#include "cio.h" +#include "cio_debug.h" +#include "css.h" +#include "device.h" +#include "chsc.h" +#include "ioasm.h" +#include "chp.h" + +static int timeout_log_enabled; + +static int __init ccw_timeout_log_setup(char *unused) +{ + timeout_log_enabled = 1; + return 1; +} + +__setup("ccw_timeout_log", ccw_timeout_log_setup); + +static void ccw_timeout_log(struct ccw_device *cdev) +{ + struct schib schib; + struct subchannel *sch; + struct io_subchannel_private *private; + union orb *orb; + int cc; + + sch = to_subchannel(cdev->dev.parent); + private = to_io_private(sch); + orb = &private->orb; + cc = stsch(sch->schid, &schib); + + printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, " + "device information:\n", get_tod_clock()); + printk(KERN_WARNING "cio: orb:\n"); + print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, + orb, sizeof(*orb), 0); + printk(KERN_WARNING "cio: ccw device bus id: %s\n", + dev_name(&cdev->dev)); + printk(KERN_WARNING "cio: subchannel bus id: %s\n", + dev_name(&sch->dev)); + printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, " + "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm); + + if (orb->tm.b) { + printk(KERN_WARNING "cio: orb indicates transport mode\n"); + printk(KERN_WARNING "cio: last tcw:\n"); + print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, + (void *)(addr_t)orb->tm.tcw, + sizeof(struct tcw), 0); + } else { + printk(KERN_WARNING "cio: orb indicates command mode\n"); + if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw || + (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws) + printk(KERN_WARNING "cio: last channel program " + "(intern):\n"); + else + printk(KERN_WARNING "cio: last channel program:\n"); + + print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, + (void *)(addr_t)orb->cmd.cpa, + sizeof(struct ccw1), 0); + } + printk(KERN_WARNING "cio: ccw device state: %d\n", + cdev->private->state); + printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc); + printk(KERN_WARNING "cio: schib:\n"); + print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, + &schib, sizeof(schib), 0); + printk(KERN_WARNING "cio: ccw device flags:\n"); + print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, + &cdev->private->flags, sizeof(cdev->private->flags), 0); +} + +/* + * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. + */ +void +ccw_device_timeout(struct timer_list *t) +{ + struct ccw_device_private *priv = from_timer(priv, t, timer); + struct ccw_device *cdev = priv->cdev; + + spin_lock_irq(cdev->ccwlock); + if (timeout_log_enabled) + ccw_timeout_log(cdev); + dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); + spin_unlock_irq(cdev->ccwlock); +} + +/* + * Set timeout + */ +void +ccw_device_set_timeout(struct ccw_device *cdev, int expires) +{ + if (expires == 0) { + del_timer(&cdev->private->timer); + return; + } + if (timer_pending(&cdev->private->timer)) { + if (mod_timer(&cdev->private->timer, jiffies + expires)) + return; + } + cdev->private->timer.expires = jiffies + expires; + add_timer(&cdev->private->timer); +} + +int +ccw_device_cancel_halt_clear(struct ccw_device *cdev) +{ + struct subchannel *sch; + int ret; + + sch = to_subchannel(cdev->dev.parent); + ret = cio_cancel_halt_clear(sch, &cdev->private->iretry); + + if (ret == -EIO) + CIO_MSG_EVENT(0, "0.%x.%04x: could not stop I/O\n", + cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + + return ret; +} + +void ccw_device_update_sense_data(struct ccw_device *cdev) +{ + memset(&cdev->id, 0, sizeof(cdev->id)); + cdev->id.cu_type = cdev->private->senseid.cu_type; + cdev->id.cu_model = cdev->private->senseid.cu_model; + cdev->id.dev_type = cdev->private->senseid.dev_type; + cdev->id.dev_model = cdev->private->senseid.dev_model; +} + +int ccw_device_test_sense_data(struct ccw_device *cdev) +{ + return cdev->id.cu_type == cdev->private->senseid.cu_type && + cdev->id.cu_model == cdev->private->senseid.cu_model && + cdev->id.dev_type == cdev->private->senseid.dev_type && + cdev->id.dev_model == cdev->private->senseid.dev_model; +} + +/* + * The machine won't give us any notification by machine check if a chpid has + * been varied online on the SE so we have to find out by magic (i. e. driving + * the channel subsystem to device selection and updating our path masks). + */ +static void +__recover_lost_chpids(struct subchannel *sch, int old_lpm) +{ + int mask, i; + struct chp_id chpid; + + chp_id_init(&chpid); + for (i = 0; i<8; i++) { + mask = 0x80 >> i; + if (!(sch->lpm & mask)) + continue; + if (old_lpm & mask) + continue; + chpid.id = sch->schib.pmcw.chpid[i]; + if (!chp_is_registered(chpid)) + css_schedule_eval_all(); + } +} + +/* + * Stop device recognition. + */ +static void +ccw_device_recog_done(struct ccw_device *cdev, int state) +{ + struct subchannel *sch; + int old_lpm; + + sch = to_subchannel(cdev->dev.parent); + + if (cio_disable_subchannel(sch)) + state = DEV_STATE_NOT_OPER; + /* + * Now that we tried recognition, we have performed device selection + * through ssch() and the path information is up to date. + */ + old_lpm = sch->lpm; + + /* Check since device may again have become not operational. */ + if (cio_update_schib(sch)) + state = DEV_STATE_NOT_OPER; + else + sch->lpm = sch->schib.pmcw.pam & sch->opm; + + if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) + /* Force reprobe on all chpids. */ + old_lpm = 0; + if (sch->lpm != old_lpm) + __recover_lost_chpids(sch, old_lpm); + if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID && + (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) { + cdev->private->flags.recog_done = 1; + cdev->private->state = DEV_STATE_DISCONNECTED; + wake_up(&cdev->private->wait_q); + return; + } + if (cdev->private->flags.resuming) { + cdev->private->state = state; + cdev->private->flags.recog_done = 1; + wake_up(&cdev->private->wait_q); + return; + } + switch (state) { + case DEV_STATE_NOT_OPER: + break; + case DEV_STATE_OFFLINE: + if (!cdev->online) { + ccw_device_update_sense_data(cdev); + break; + } + cdev->private->state = DEV_STATE_OFFLINE; + cdev->private->flags.recog_done = 1; + if (ccw_device_test_sense_data(cdev)) { + cdev->private->flags.donotify = 1; + ccw_device_online(cdev); + wake_up(&cdev->private->wait_q); + } else { + ccw_device_update_sense_data(cdev); + ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); + } + return; + case DEV_STATE_BOXED: + if (cdev->id.cu_type != 0) { /* device was recognized before */ + cdev->private->flags.recog_done = 1; + cdev->private->state = DEV_STATE_BOXED; + wake_up(&cdev->private->wait_q); + return; + } + break; + } + cdev->private->state = state; + io_subchannel_recog_done(cdev); + wake_up(&cdev->private->wait_q); +} + +/* + * Function called from device_id.c after sense id has completed. + */ +void +ccw_device_sense_id_done(struct ccw_device *cdev, int err) +{ + switch (err) { + case 0: + ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); + break; + case -ETIME: /* Sense id stopped by timeout. */ + ccw_device_recog_done(cdev, DEV_STATE_BOXED); + break; + default: + ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); + break; + } +} + +/** + * ccw_device_notify() - inform the device's driver about an event + * @cdev: device for which an event occurred + * @event: event that occurred + * + * Returns: + * -%EINVAL if the device is offline or has no driver. + * -%EOPNOTSUPP if the device's driver has no notifier registered. + * %NOTIFY_OK if the driver wants to keep the device. + * %NOTIFY_BAD if the driver doesn't want to keep the device. + */ +int ccw_device_notify(struct ccw_device *cdev, int event) +{ + int ret = -EINVAL; + + if (!cdev->drv) + goto out; + if (!cdev->online) + goto out; + CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", + cdev->private->dev_id.ssid, cdev->private->dev_id.devno, + event); + if (!cdev->drv->notify) { + ret = -EOPNOTSUPP; + goto out; + } + if (cdev->drv->notify(cdev, event)) + ret = NOTIFY_OK; + else + ret = NOTIFY_BAD; +out: + return ret; +} + +static void ccw_device_oper_notify(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) { + /* Reenable channel measurements, if needed. */ + ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF); + /* Save indication for new paths. */ + cdev->private->path_new_mask = sch->vpm; + return; + } + /* Driver doesn't want device back. */ + ccw_device_set_notoper(cdev); + ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); +} + +/* + * Finished with online/offline processing. + */ +static void +ccw_device_done(struct ccw_device *cdev, int state) +{ + struct subchannel *sch; + + sch = to_subchannel(cdev->dev.parent); + + ccw_device_set_timeout(cdev, 0); + + if (state != DEV_STATE_ONLINE) + cio_disable_subchannel(sch); + + /* Reset device status. */ + memset(&cdev->private->irb, 0, sizeof(struct irb)); + + cdev->private->state = state; + + switch (state) { + case DEV_STATE_BOXED: + CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", + cdev->private->dev_id.devno, sch->schid.sch_no); + if (cdev->online && + ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK) + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + cdev->private->flags.donotify = 0; + break; + case DEV_STATE_NOT_OPER: + CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n", + cdev->private->dev_id.devno, sch->schid.sch_no); + if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + else + ccw_device_set_disconnected(cdev); + cdev->private->flags.donotify = 0; + break; + case DEV_STATE_DISCONNECTED: + CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel " + "%04x\n", cdev->private->dev_id.devno, + sch->schid.sch_no); + if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) { + cdev->private->state = DEV_STATE_NOT_OPER; + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + } else + ccw_device_set_disconnected(cdev); + cdev->private->flags.donotify = 0; + break; + default: + break; + } + + if (cdev->private->flags.donotify) { + cdev->private->flags.donotify = 0; + ccw_device_oper_notify(cdev); + } + wake_up(&cdev->private->wait_q); +} + +/* + * Start device recognition. + */ +void ccw_device_recognition(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + /* + * We used to start here with a sense pgid to find out whether a device + * is locked by someone else. Unfortunately, the sense pgid command + * code has other meanings on devices predating the path grouping + * algorithm, so we start with sense id and box the device after an + * timeout (or if sense pgid during path verification detects the device + * is locked, as may happen on newer devices). + */ + cdev->private->flags.recog_done = 0; + cdev->private->state = DEV_STATE_SENSE_ID; + if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) { + ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); + return; + } + ccw_device_sense_id_start(cdev); +} + +/* + * Handle events for states that use the ccw request infrastructure. + */ +static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e) +{ + switch (e) { + case DEV_EVENT_NOTOPER: + ccw_request_notoper(cdev); + break; + case DEV_EVENT_INTERRUPT: + ccw_request_handler(cdev); + break; + case DEV_EVENT_TIMEOUT: + ccw_request_timeout(cdev); + break; + default: + break; + } +} + +static void ccw_device_report_path_events(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + int path_event[8]; + int chp, mask; + + for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) { + path_event[chp] = PE_NONE; + if (mask & cdev->private->path_gone_mask & ~(sch->vpm)) + path_event[chp] |= PE_PATH_GONE; + if (mask & cdev->private->path_new_mask & sch->vpm) + path_event[chp] |= PE_PATH_AVAILABLE; + if (mask & cdev->private->pgid_reset_mask & sch->vpm) + path_event[chp] |= PE_PATHGROUP_ESTABLISHED; + } + if (cdev->online && cdev->drv->path_event) + cdev->drv->path_event(cdev, path_event); +} + +static void ccw_device_reset_path_events(struct ccw_device *cdev) +{ + cdev->private->path_gone_mask = 0; + cdev->private->path_new_mask = 0; + cdev->private->pgid_reset_mask = 0; +} + +static void create_fake_irb(struct irb *irb, int type) +{ + memset(irb, 0, sizeof(*irb)); + if (type == FAKE_CMD_IRB) { + struct cmd_scsw *scsw = &irb->scsw.cmd; + scsw->cc = 1; + scsw->fctl = SCSW_FCTL_START_FUNC; + scsw->actl = SCSW_ACTL_START_PEND; + scsw->stctl = SCSW_STCTL_STATUS_PEND; + } else if (type == FAKE_TM_IRB) { + struct tm_scsw *scsw = &irb->scsw.tm; + scsw->x = 1; + scsw->cc = 1; + scsw->fctl = SCSW_FCTL_START_FUNC; + scsw->actl = SCSW_ACTL_START_PEND; + scsw->stctl = SCSW_STCTL_STATUS_PEND; + } +} + +static void ccw_device_handle_broken_paths(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + u8 broken_paths = (sch->schib.pmcw.pam & sch->opm) ^ sch->vpm; + + if (broken_paths && (cdev->private->path_broken_mask != broken_paths)) + ccw_device_schedule_recovery(); + + cdev->private->path_broken_mask = broken_paths; +} + +void ccw_device_verify_done(struct ccw_device *cdev, int err) +{ + struct subchannel *sch; + + sch = to_subchannel(cdev->dev.parent); + /* Update schib - pom may have changed. */ + if (cio_update_schib(sch)) { + err = -ENODEV; + goto callback; + } + /* Update lpm with verified path mask. */ + sch->lpm = sch->vpm; + /* Repeat path verification? */ + if (cdev->private->flags.doverify) { + ccw_device_verify_start(cdev); + return; + } +callback: + switch (err) { + case 0: + ccw_device_done(cdev, DEV_STATE_ONLINE); + /* Deliver fake irb to device driver, if needed. */ + if (cdev->private->flags.fake_irb) { + create_fake_irb(&cdev->private->irb, + cdev->private->flags.fake_irb); + cdev->private->flags.fake_irb = 0; + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + &cdev->private->irb); + memset(&cdev->private->irb, 0, sizeof(struct irb)); + } + ccw_device_report_path_events(cdev); + ccw_device_handle_broken_paths(cdev); + break; + case -ETIME: + case -EUSERS: + /* Reset oper notify indication after verify error. */ + cdev->private->flags.donotify = 0; + ccw_device_done(cdev, DEV_STATE_BOXED); + break; + case -EACCES: + /* Reset oper notify indication after verify error. */ + cdev->private->flags.donotify = 0; + ccw_device_done(cdev, DEV_STATE_DISCONNECTED); + break; + default: + /* Reset oper notify indication after verify error. */ + cdev->private->flags.donotify = 0; + ccw_device_done(cdev, DEV_STATE_NOT_OPER); + break; + } + ccw_device_reset_path_events(cdev); +} + +/* + * Get device online. + */ +int +ccw_device_online(struct ccw_device *cdev) +{ + struct subchannel *sch; + int ret; + + if ((cdev->private->state != DEV_STATE_OFFLINE) && + (cdev->private->state != DEV_STATE_BOXED)) + return -EINVAL; + sch = to_subchannel(cdev->dev.parent); + ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); + if (ret != 0) { + /* Couldn't enable the subchannel for i/o. Sick device. */ + if (ret == -ENODEV) + dev_fsm_event(cdev, DEV_EVENT_NOTOPER); + return ret; + } + /* Start initial path verification. */ + cdev->private->state = DEV_STATE_VERIFY; + ccw_device_verify_start(cdev); + return 0; +} + +void +ccw_device_disband_done(struct ccw_device *cdev, int err) +{ + switch (err) { + case 0: + ccw_device_done(cdev, DEV_STATE_OFFLINE); + break; + case -ETIME: + ccw_device_done(cdev, DEV_STATE_BOXED); + break; + default: + cdev->private->flags.donotify = 0; + ccw_device_done(cdev, DEV_STATE_NOT_OPER); + break; + } +} + +/* + * Shutdown device. + */ +int +ccw_device_offline(struct ccw_device *cdev) +{ + struct subchannel *sch; + + /* Allow ccw_device_offline while disconnected. */ + if (cdev->private->state == DEV_STATE_DISCONNECTED || + cdev->private->state == DEV_STATE_NOT_OPER) { + cdev->private->flags.donotify = 0; + ccw_device_done(cdev, DEV_STATE_NOT_OPER); + return 0; + } + if (cdev->private->state == DEV_STATE_BOXED) { + ccw_device_done(cdev, DEV_STATE_BOXED); + return 0; + } + if (ccw_device_is_orphan(cdev)) { + ccw_device_done(cdev, DEV_STATE_OFFLINE); + return 0; + } + sch = to_subchannel(cdev->dev.parent); + if (cio_update_schib(sch)) + return -ENODEV; + if (scsw_actl(&sch->schib.scsw) != 0) + return -EBUSY; + if (cdev->private->state != DEV_STATE_ONLINE) + return -EINVAL; + /* Are we doing path grouping? */ + if (!cdev->private->flags.pgroup) { + /* No, set state offline immediately. */ + ccw_device_done(cdev, DEV_STATE_OFFLINE); + return 0; + } + /* Start Set Path Group commands. */ + cdev->private->state = DEV_STATE_DISBAND_PGID; + ccw_device_disband_start(cdev); + return 0; +} + +/* + * Handle not operational event in non-special state. + */ +static void ccw_device_generic_notoper(struct ccw_device *cdev, + enum dev_event dev_event) +{ + if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) + ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); + else + ccw_device_set_disconnected(cdev); +} + +/* + * Handle path verification event in offline state. + */ +static void ccw_device_offline_verify(struct ccw_device *cdev, + enum dev_event dev_event) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + css_schedule_eval(sch->schid); +} + +/* + * Handle path verification event. + */ +static void +ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) +{ + struct subchannel *sch; + + if (cdev->private->state == DEV_STATE_W4SENSE) { + cdev->private->flags.doverify = 1; + return; + } + sch = to_subchannel(cdev->dev.parent); + /* + * Since we might not just be coming from an interrupt from the + * subchannel we have to update the schib. + */ + if (cio_update_schib(sch)) { + ccw_device_verify_done(cdev, -ENODEV); + return; + } + + if (scsw_actl(&sch->schib.scsw) != 0 || + (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || + (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { + /* + * No final status yet or final status not yet delivered + * to the device driver. Can't do path verification now, + * delay until final status was delivered. + */ + cdev->private->flags.doverify = 1; + return; + } + /* Device is idle, we can do the path verification. */ + cdev->private->state = DEV_STATE_VERIFY; + ccw_device_verify_start(cdev); +} + +/* + * Handle path verification event in boxed state. + */ +static void ccw_device_boxed_verify(struct ccw_device *cdev, + enum dev_event dev_event) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + if (cdev->online) { + if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) + ccw_device_done(cdev, DEV_STATE_NOT_OPER); + else + ccw_device_online_verify(cdev, dev_event); + } else + css_schedule_eval(sch->schid); +} + +/* + * Pass interrupt to device driver. + */ +static int ccw_device_call_handler(struct ccw_device *cdev) +{ + unsigned int stctl; + int ending_status; + + /* + * we allow for the device action handler if . + * - we received ending status + * - the action handler requested to see all interrupts + * - we received an intermediate status + * - fast notification was requested (primary status) + * - unsolicited interrupts + */ + stctl = scsw_stctl(&cdev->private->irb.scsw); + ending_status = (stctl & SCSW_STCTL_SEC_STATUS) || + (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) || + (stctl == SCSW_STCTL_STATUS_PEND); + if (!ending_status && + !cdev->private->options.repall && + !(stctl & SCSW_STCTL_INTER_STATUS) && + !(cdev->private->options.fast && + (stctl & SCSW_STCTL_PRIM_STATUS))) + return 0; + + if (ending_status) + ccw_device_set_timeout(cdev, 0); + + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + &cdev->private->irb); + + memset(&cdev->private->irb, 0, sizeof(struct irb)); + return 1; +} + +/* + * Got an interrupt for a normal io (state online). + */ +static void +ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) +{ + struct irb *irb; + int is_cmd; + + irb = this_cpu_ptr(&cio_irb); + is_cmd = !scsw_is_tm(&irb->scsw); + /* Check for unsolicited interrupt. */ + if (!scsw_is_solicited(&irb->scsw)) { + if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && + !irb->esw.esw0.erw.cons) { + /* Unit check but no sense data. Need basic sense. */ + if (ccw_device_do_sense(cdev, irb) != 0) + goto call_handler_unsol; + memcpy(&cdev->private->irb, irb, sizeof(struct irb)); + cdev->private->state = DEV_STATE_W4SENSE; + cdev->private->intparm = 0; + return; + } +call_handler_unsol: + if (cdev->handler) + cdev->handler (cdev, 0, irb); + if (cdev->private->flags.doverify) + ccw_device_online_verify(cdev, 0); + return; + } + /* Accumulate status and find out if a basic sense is needed. */ + ccw_device_accumulate_irb(cdev, irb); + if (is_cmd && cdev->private->flags.dosense) { + if (ccw_device_do_sense(cdev, irb) == 0) { + cdev->private->state = DEV_STATE_W4SENSE; + } + return; + } + /* Call the handler. */ + if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) + /* Start delayed path verification. */ + ccw_device_online_verify(cdev, 0); +} + +/* + * Got an timeout in online state. + */ +static void +ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) +{ + int ret; + + ccw_device_set_timeout(cdev, 0); + cdev->private->iretry = 255; + cdev->private->async_kill_io_rc = -ETIMEDOUT; + ret = ccw_device_cancel_halt_clear(cdev); + if (ret == -EBUSY) { + ccw_device_set_timeout(cdev, 3*HZ); + cdev->private->state = DEV_STATE_TIMEOUT_KILL; + return; + } + if (ret) + dev_fsm_event(cdev, DEV_EVENT_NOTOPER); + else if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + ERR_PTR(-ETIMEDOUT)); +} + +/* + * Got an interrupt for a basic sense. + */ +static void +ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) +{ + struct irb *irb; + + irb = this_cpu_ptr(&cio_irb); + /* Check for unsolicited interrupt. */ + if (scsw_stctl(&irb->scsw) == + (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { + if (scsw_cc(&irb->scsw) == 1) + /* Basic sense hasn't started. Try again. */ + ccw_device_do_sense(cdev, irb); + else { + CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " + "interrupt during w4sense...\n", + cdev->private->dev_id.ssid, + cdev->private->dev_id.devno); + if (cdev->handler) + cdev->handler (cdev, 0, irb); + } + return; + } + /* + * Check if a halt or clear has been issued in the meanwhile. If yes, + * only deliver the halt/clear interrupt to the device driver as if it + * had killed the original request. + */ + if (scsw_fctl(&irb->scsw) & + (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { + cdev->private->flags.dosense = 0; + memset(&cdev->private->irb, 0, sizeof(struct irb)); + ccw_device_accumulate_irb(cdev, irb); + goto call_handler; + } + /* Add basic sense info to irb. */ + ccw_device_accumulate_basic_sense(cdev, irb); + if (cdev->private->flags.dosense) { + /* Another basic sense is needed. */ + ccw_device_do_sense(cdev, irb); + return; + } +call_handler: + cdev->private->state = DEV_STATE_ONLINE; + /* In case sensing interfered with setting the device online */ + wake_up(&cdev->private->wait_q); + /* Call the handler. */ + if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) + /* Start delayed path verification. */ + ccw_device_online_verify(cdev, 0); +} + +static void +ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) +{ + ccw_device_set_timeout(cdev, 0); + /* Start delayed path verification. */ + ccw_device_online_verify(cdev, 0); + /* OK, i/o is dead now. Call interrupt handler. */ + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + ERR_PTR(cdev->private->async_kill_io_rc)); +} + +static void +ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) +{ + int ret; + + ret = ccw_device_cancel_halt_clear(cdev); + if (ret == -EBUSY) { + ccw_device_set_timeout(cdev, 3*HZ); + return; + } + /* Start delayed path verification. */ + ccw_device_online_verify(cdev, 0); + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + ERR_PTR(cdev->private->async_kill_io_rc)); +} + +void ccw_device_kill_io(struct ccw_device *cdev) +{ + int ret; + + ccw_device_set_timeout(cdev, 0); + cdev->private->iretry = 255; + cdev->private->async_kill_io_rc = -EIO; + ret = ccw_device_cancel_halt_clear(cdev); + if (ret == -EBUSY) { + ccw_device_set_timeout(cdev, 3*HZ); + cdev->private->state = DEV_STATE_TIMEOUT_KILL; + return; + } + /* Start delayed path verification. */ + ccw_device_online_verify(cdev, 0); + if (cdev->handler) + cdev->handler(cdev, cdev->private->intparm, + ERR_PTR(-EIO)); +} + +static void +ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) +{ + /* Start verification after current task finished. */ + cdev->private->flags.doverify = 1; +} + +static void +ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) +{ + struct subchannel *sch; + + sch = to_subchannel(cdev->dev.parent); + if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) + /* Couldn't enable the subchannel for i/o. Sick device. */ + return; + cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; + ccw_device_sense_id_start(cdev); +} + +void ccw_device_trigger_reprobe(struct ccw_device *cdev) +{ + struct subchannel *sch; + + if (cdev->private->state != DEV_STATE_DISCONNECTED) + return; + + sch = to_subchannel(cdev->dev.parent); + /* Update some values. */ + if (cio_update_schib(sch)) + return; + /* + * The pim, pam, pom values may not be accurate, but they are the best + * we have before performing device selection :/ + */ + sch->lpm = sch->schib.pmcw.pam & sch->opm; + /* + * Use the initial configuration since we can't be shure that the old + * paths are valid. + */ + io_subchannel_init_config(sch); + if (cio_commit_config(sch)) + return; + + /* We should also udate ssd info, but this has to wait. */ + /* Check if this is another device which appeared on the same sch. */ + if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) + css_schedule_eval(sch->schid); + else + ccw_device_start_id(cdev, 0); +} + +static void ccw_device_disabled_irq(struct ccw_device *cdev, + enum dev_event dev_event) +{ + struct subchannel *sch; + + sch = to_subchannel(cdev->dev.parent); + /* + * An interrupt in a disabled state means a previous disable was not + * successful - should not happen, but we try to disable again. + */ + cio_disable_subchannel(sch); +} + +static void +ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) +{ + retry_set_schib(cdev); + cdev->private->state = DEV_STATE_ONLINE; + dev_fsm_event(cdev, dev_event); +} + +static void ccw_device_update_cmfblock(struct ccw_device *cdev, + enum dev_event dev_event) +{ + cmf_retry_copy_block(cdev); + cdev->private->state = DEV_STATE_ONLINE; + dev_fsm_event(cdev, dev_event); +} + +static void +ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) +{ + ccw_device_set_timeout(cdev, 0); + cdev->private->state = DEV_STATE_NOT_OPER; + wake_up(&cdev->private->wait_q); +} + +static void +ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) +{ + int ret; + + ret = ccw_device_cancel_halt_clear(cdev); + if (ret == -EBUSY) { + ccw_device_set_timeout(cdev, HZ/10); + } else { + cdev->private->state = DEV_STATE_NOT_OPER; + wake_up(&cdev->private->wait_q); + } +} + +/* + * No operation action. This is used e.g. to ignore a timeout event in + * state offline. + */ +static void +ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) +{ +} + +/* + * device statemachine + */ +fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { + [DEV_STATE_NOT_OPER] = { + [DEV_EVENT_NOTOPER] = ccw_device_nop, + [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, + [DEV_EVENT_TIMEOUT] = ccw_device_nop, + [DEV_EVENT_VERIFY] = ccw_device_nop, + }, + [DEV_STATE_SENSE_ID] = { + [DEV_EVENT_NOTOPER] = ccw_device_request_event, + [DEV_EVENT_INTERRUPT] = ccw_device_request_event, + [DEV_EVENT_TIMEOUT] = ccw_device_request_event, + [DEV_EVENT_VERIFY] = ccw_device_nop, + }, + [DEV_STATE_OFFLINE] = { + [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, + [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, + [DEV_EVENT_TIMEOUT] = ccw_device_nop, + [DEV_EVENT_VERIFY] = ccw_device_offline_verify, + }, + [DEV_STATE_VERIFY] = { + [DEV_EVENT_NOTOPER] = ccw_device_request_event, + [DEV_EVENT_INTERRUPT] = ccw_device_request_event, + [DEV_EVENT_TIMEOUT] = ccw_device_request_event, + [DEV_EVENT_VERIFY] = ccw_device_delay_verify, + }, + [DEV_STATE_ONLINE] = { + [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, + [DEV_EVENT_INTERRUPT] = ccw_device_irq, + [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, + [DEV_EVENT_VERIFY] = ccw_device_online_verify, + }, + [DEV_STATE_W4SENSE] = { + [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, + [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, + [DEV_EVENT_TIMEOUT] = ccw_device_nop, + [DEV_EVENT_VERIFY] = ccw_device_online_verify, + }, + [DEV_STATE_DISBAND_PGID] = { + [DEV_EVENT_NOTOPER] = ccw_device_request_event, + [DEV_EVENT_INTERRUPT] = ccw_device_request_event, + [DEV_EVENT_TIMEOUT] = ccw_device_request_event, + [DEV_EVENT_VERIFY] = ccw_device_nop, + }, + [DEV_STATE_BOXED] = { + [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, + [DEV_EVENT_INTERRUPT] = ccw_device_nop, + [DEV_EVENT_TIMEOUT] = ccw_device_nop, + [DEV_EVENT_VERIFY] = ccw_device_boxed_verify, + }, + /* states to wait for i/o completion before doing something */ + [DEV_STATE_TIMEOUT_KILL] = { + [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, + [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, + [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, + [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME + }, + [DEV_STATE_QUIESCE] = { + [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, + [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, + [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, + [DEV_EVENT_VERIFY] = ccw_device_nop, + }, + /* special states for devices gone not operational */ + [DEV_STATE_DISCONNECTED] = { + [DEV_EVENT_NOTOPER] = ccw_device_nop, + [DEV_EVENT_INTERRUPT] = ccw_device_start_id, + [DEV_EVENT_TIMEOUT] = ccw_device_nop, + [DEV_EVENT_VERIFY] = ccw_device_start_id, + }, + [DEV_STATE_DISCONNECTED_SENSE_ID] = { + [DEV_EVENT_NOTOPER] = ccw_device_request_event, + [DEV_EVENT_INTERRUPT] = ccw_device_request_event, + [DEV_EVENT_TIMEOUT] = ccw_device_request_event, + [DEV_EVENT_VERIFY] = ccw_device_nop, + }, + [DEV_STATE_CMFCHANGE] = { + [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, + [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, + [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, + [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, + }, + [DEV_STATE_CMFUPDATE] = { + [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, + [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, + [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, + [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, + }, + [DEV_STATE_STEAL_LOCK] = { + [DEV_EVENT_NOTOPER] = ccw_device_request_event, + [DEV_EVENT_INTERRUPT] = ccw_device_request_event, + [DEV_EVENT_TIMEOUT] = ccw_device_request_event, + [DEV_EVENT_VERIFY] = ccw_device_nop, + }, +}; + +EXPORT_SYMBOL_GPL(ccw_device_set_timeout); diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c new file mode 100644 index 000000000..f6df83a9d --- /dev/null +++ b/drivers/s390/cio/device_id.c @@ -0,0 +1,223 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * CCW device SENSE ID I/O handling. + * + * Copyright IBM Corp. 2002, 2009 + * Author(s): Cornelia Huck + * Martin Schwidefsky + * Peter Oberparleiter + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "cio.h" +#include "cio_debug.h" +#include "device.h" +#include "io_sch.h" + +#define SENSE_ID_RETRIES 256 +#define SENSE_ID_TIMEOUT (10 * HZ) +#define SENSE_ID_MIN_LEN 4 +#define SENSE_ID_BASIC_LEN 7 + +/** + * diag210_to_senseid - convert diag 0x210 data to sense id information + * @senseid: sense id + * @diag: diag 0x210 data + * + * Return 0 on success, non-zero otherwise. + */ +static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag) +{ + static struct { + int class, type, cu_type; + } vm_devices[] = { + { 0x08, 0x01, 0x3480 }, + { 0x08, 0x02, 0x3430 }, + { 0x08, 0x10, 0x3420 }, + { 0x08, 0x42, 0x3424 }, + { 0x08, 0x44, 0x9348 }, + { 0x08, 0x81, 0x3490 }, + { 0x08, 0x82, 0x3422 }, + { 0x10, 0x41, 0x1403 }, + { 0x10, 0x42, 0x3211 }, + { 0x10, 0x43, 0x3203 }, + { 0x10, 0x45, 0x3800 }, + { 0x10, 0x47, 0x3262 }, + { 0x10, 0x48, 0x3820 }, + { 0x10, 0x49, 0x3800 }, + { 0x10, 0x4a, 0x4245 }, + { 0x10, 0x4b, 0x4248 }, + { 0x10, 0x4d, 0x3800 }, + { 0x10, 0x4e, 0x3820 }, + { 0x10, 0x4f, 0x3820 }, + { 0x10, 0x82, 0x2540 }, + { 0x10, 0x84, 0x3525 }, + { 0x20, 0x81, 0x2501 }, + { 0x20, 0x82, 0x2540 }, + { 0x20, 0x84, 0x3505 }, + { 0x40, 0x01, 0x3278 }, + { 0x40, 0x04, 0x3277 }, + { 0x40, 0x80, 0x2250 }, + { 0x40, 0xc0, 0x5080 }, + { 0x80, 0x00, 0x3215 }, + }; + int i; + + /* Special case for osa devices. */ + if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) { + senseid->cu_type = 0x3088; + senseid->cu_model = 0x60; + senseid->reserved = 0xff; + return 0; + } + for (i = 0; i < ARRAY_SIZE(vm_devices); i++) { + if (diag->vrdcvcla == vm_devices[i].class && + diag->vrdcvtyp == vm_devices[i].type) { + senseid->cu_type = vm_devices[i].cu_type; + senseid->reserved = 0xff; + return 0; + } + } + + return -ENODEV; +} + +/** + * diag_get_dev_info - retrieve device information via diag 0x210 + * @cdev: ccw device + * + * Returns zero on success, non-zero otherwise. + */ +static int diag210_get_dev_info(struct ccw_device *cdev) +{ + struct ccw_dev_id *dev_id = &cdev->private->dev_id; + struct senseid *senseid = &cdev->private->senseid; + struct diag210 diag_data; + int rc; + + if (dev_id->ssid != 0) + return -ENODEV; + memset(&diag_data, 0, sizeof(diag_data)); + diag_data.vrdcdvno = dev_id->devno; + diag_data.vrdclen = sizeof(diag_data); + rc = diag210(&diag_data); + CIO_TRACE_EVENT(4, "diag210"); + CIO_HEX_EVENT(4, &rc, sizeof(rc)); + CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data)); + if (rc != 0 && rc != 2) + goto err_failed; + if (diag210_to_senseid(senseid, &diag_data)) + goto err_unknown; + return 0; + +err_unknown: + CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n", + dev_id->ssid, dev_id->devno); + return -ENODEV; +err_failed: + CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n", + dev_id->ssid, dev_id->devno, rc); + return -ENODEV; +} + +/* + * Initialize SENSE ID data. + */ +static void snsid_init(struct ccw_device *cdev) +{ + cdev->private->flags.esid = 0; + memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid)); + cdev->private->senseid.cu_type = 0xffff; +} + +/* + * Check for complete SENSE ID data. + */ +static int snsid_check(struct ccw_device *cdev, void *data) +{ + struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd; + int len = sizeof(struct senseid) - scsw->count; + + /* Check for incomplete SENSE ID data. */ + if (len < SENSE_ID_MIN_LEN) + goto out_restart; + if (cdev->private->senseid.cu_type == 0xffff) + goto out_restart; + /* Check for incompatible SENSE ID data. */ + if (cdev->private->senseid.reserved != 0xff) + return -EOPNOTSUPP; + /* Check for extended-identification information. */ + if (len > SENSE_ID_BASIC_LEN) + cdev->private->flags.esid = 1; + return 0; + +out_restart: + snsid_init(cdev); + return -EAGAIN; +} + +/* + * Process SENSE ID request result. + */ +static void snsid_callback(struct ccw_device *cdev, void *data, int rc) +{ + struct ccw_dev_id *id = &cdev->private->dev_id; + struct senseid *senseid = &cdev->private->senseid; + int vm = 0; + + if (rc && MACHINE_IS_VM) { + /* Try diag 0x210 fallback on z/VM. */ + snsid_init(cdev); + if (diag210_get_dev_info(cdev) == 0) { + rc = 0; + vm = 1; + } + } + CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x " + "%04x/%02x%s\n", id->ssid, id->devno, rc, + senseid->cu_type, senseid->cu_model, senseid->dev_type, + senseid->dev_model, vm ? " (diag210)" : ""); + ccw_device_sense_id_done(cdev, rc); +} + +/** + * ccw_device_sense_id_start - perform SENSE ID + * @cdev: ccw device + * + * Execute a SENSE ID channel program on @cdev to update its sense id + * information. When finished, call ccw_device_sense_id_done with a + * return code specifying the result. + */ +void ccw_device_sense_id_start(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + struct ccw1 *cp = cdev->private->iccws; + + CIO_TRACE_EVENT(4, "snsid"); + CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); + /* Data setup. */ + snsid_init(cdev); + /* Channel program setup. */ + cp->cmd_code = CCW_CMD_SENSE_ID; + cp->cda = (u32) (addr_t) &cdev->private->senseid; + cp->count = sizeof(struct senseid); + cp->flags = CCW_FLAG_SLI; + /* Request setup. */ + memset(req, 0, sizeof(*req)); + req->cp = cp; + req->timeout = SENSE_ID_TIMEOUT; + req->maxretries = SENSE_ID_RETRIES; + req->lpm = sch->schib.pmcw.pam & sch->opm; + req->check = snsid_check; + req->callback = snsid_callback; + ccw_request_start(cdev); +} diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c new file mode 100644 index 000000000..f0cae1973 --- /dev/null +++ b/drivers/s390/cio/device_ops.c @@ -0,0 +1,715 @@ +// SPDX-License-Identifier: GPL-1.0+ +/* + * Copyright IBM Corp. 2002, 2009 + * + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) + * Cornelia Huck (cornelia.huck@de.ibm.com) + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "cio.h" +#include "cio_debug.h" +#include "css.h" +#include "chsc.h" +#include "device.h" +#include "chp.h" + +/** + * ccw_device_set_options_mask() - set some options and unset the rest + * @cdev: device for which the options are to be set + * @flags: options to be set + * + * All flags specified in @flags are set, all flags not specified in @flags + * are cleared. + * Returns: + * %0 on success, -%EINVAL on an invalid flag combination. + */ +int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags) +{ + /* + * The flag usage is mutal exclusive ... + */ + if ((flags & CCWDEV_EARLY_NOTIFICATION) && + (flags & CCWDEV_REPORT_ALL)) + return -EINVAL; + cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0; + cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0; + cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0; + cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0; + cdev->private->options.mpath = (flags & CCWDEV_DO_MULTIPATH) != 0; + return 0; +} + +/** + * ccw_device_set_options() - set some options + * @cdev: device for which the options are to be set + * @flags: options to be set + * + * All flags specified in @flags are set, the remainder is left untouched. + * Returns: + * %0 on success, -%EINVAL if an invalid flag combination would ensue. + */ +int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags) +{ + /* + * The flag usage is mutal exclusive ... + */ + if (((flags & CCWDEV_EARLY_NOTIFICATION) && + (flags & CCWDEV_REPORT_ALL)) || + ((flags & CCWDEV_EARLY_NOTIFICATION) && + cdev->private->options.repall) || + ((flags & CCWDEV_REPORT_ALL) && + cdev->private->options.fast)) + return -EINVAL; + cdev->private->options.fast |= (flags & CCWDEV_EARLY_NOTIFICATION) != 0; + cdev->private->options.repall |= (flags & CCWDEV_REPORT_ALL) != 0; + cdev->private->options.pgroup |= (flags & CCWDEV_DO_PATHGROUP) != 0; + cdev->private->options.force |= (flags & CCWDEV_ALLOW_FORCE) != 0; + cdev->private->options.mpath |= (flags & CCWDEV_DO_MULTIPATH) != 0; + return 0; +} + +/** + * ccw_device_clear_options() - clear some options + * @cdev: device for which the options are to be cleared + * @flags: options to be cleared + * + * All flags specified in @flags are cleared, the remainder is left untouched. + */ +void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags) +{ + cdev->private->options.fast &= (flags & CCWDEV_EARLY_NOTIFICATION) == 0; + cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0; + cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0; + cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0; + cdev->private->options.mpath &= (flags & CCWDEV_DO_MULTIPATH) == 0; +} + +/** + * ccw_device_is_pathgroup() - determine if paths to this device are grouped + * @cdev: ccw device + * + * Return non-zero if there is a path group, zero otherwise. + */ +int ccw_device_is_pathgroup(struct ccw_device *cdev) +{ + return cdev->private->flags.pgroup; +} +EXPORT_SYMBOL(ccw_device_is_pathgroup); + +/** + * ccw_device_is_multipath() - determine if device is operating in multipath mode + * @cdev: ccw device + * + * Return non-zero if device is operating in multipath mode, zero otherwise. + */ +int ccw_device_is_multipath(struct ccw_device *cdev) +{ + return cdev->private->flags.mpath; +} +EXPORT_SYMBOL(ccw_device_is_multipath); + +/** + * ccw_device_clear() - terminate I/O request processing + * @cdev: target ccw device + * @intparm: interruption parameter; value is only used if no I/O is + * outstanding, otherwise the intparm associated with the I/O request + * is returned + * + * ccw_device_clear() calls csch on @cdev's subchannel. + * Returns: + * %0 on success, + * -%ENODEV on device not operational, + * -%EINVAL on invalid device state. + * Context: + * Interrupts disabled, ccw device lock held + */ +int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm) +{ + struct subchannel *sch; + int ret; + + if (!cdev || !cdev->dev.parent) + return -ENODEV; + sch = to_subchannel(cdev->dev.parent); + if (!sch->schib.pmcw.ena) + return -EINVAL; + if (cdev->private->state == DEV_STATE_NOT_OPER) + return -ENODEV; + if (cdev->private->state != DEV_STATE_ONLINE && + cdev->private->state != DEV_STATE_W4SENSE) + return -EINVAL; + + ret = cio_clear(sch); + if (ret == 0) + cdev->private->intparm = intparm; + return ret; +} + +/** + * ccw_device_start_timeout_key() - start a s390 channel program with timeout and key + * @cdev: target ccw device + * @cpa: logical start address of channel program + * @intparm: user specific interruption parameter; will be presented back to + * @cdev's interrupt handler. Allows a device driver to associate + * the interrupt with a particular I/O request. + * @lpm: defines the channel path to be used for a specific I/O request. A + * value of 0 will make cio use the opm. + * @key: storage key to be used for the I/O + * @flags: additional flags; defines the action to be performed for I/O + * processing. + * @expires: timeout value in jiffies + * + * Start a S/390 channel program. When the interrupt arrives, the + * IRQ handler is called, either immediately, delayed (dev-end missing, + * or sense required) or never (no IRQ handler registered). + * This function notifies the device driver if the channel program has not + * completed during the time specified by @expires. If a timeout occurs, the + * channel program is terminated via xsch, hsch or csch, and the device's + * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT). + * Returns: + * %0, if the operation was successful; + * -%EBUSY, if the device is busy, or status pending; + * -%EACCES, if no path specified in @lpm is operational; + * -%ENODEV, if the device is not operational. + * Context: + * Interrupts disabled, ccw device lock held + */ +int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa, + unsigned long intparm, __u8 lpm, __u8 key, + unsigned long flags, int expires) +{ + struct subchannel *sch; + int ret; + + if (!cdev || !cdev->dev.parent) + return -ENODEV; + sch = to_subchannel(cdev->dev.parent); + if (!sch->schib.pmcw.ena) + return -EINVAL; + if (cdev->private->state == DEV_STATE_NOT_OPER) + return -ENODEV; + if (cdev->private->state == DEV_STATE_VERIFY) { + /* Remember to fake irb when finished. */ + if (!cdev->private->flags.fake_irb) { + cdev->private->flags.fake_irb = FAKE_CMD_IRB; + cdev->private->intparm = intparm; + return 0; + } else + /* There's already a fake I/O around. */ + return -EBUSY; + } + if (cdev->private->state != DEV_STATE_ONLINE || + ((sch->schib.scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) && + !(sch->schib.scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS)) || + cdev->private->flags.doverify) + return -EBUSY; + ret = cio_set_options (sch, flags); + if (ret) + return ret; + /* Adjust requested path mask to exclude unusable paths. */ + if (lpm) { + lpm &= sch->lpm; + if (lpm == 0) + return -EACCES; + } + ret = cio_start_key (sch, cpa, lpm, key); + switch (ret) { + case 0: + cdev->private->intparm = intparm; + if (expires) + ccw_device_set_timeout(cdev, expires); + break; + case -EACCES: + case -ENODEV: + dev_fsm_event(cdev, DEV_EVENT_VERIFY); + break; + } + return ret; +} + +/** + * ccw_device_start_key() - start a s390 channel program with key + * @cdev: target ccw device + * @cpa: logical start address of channel program + * @intparm: user specific interruption parameter; will be presented back to + * @cdev's interrupt handler. Allows a device driver to associate + * the interrupt with a particular I/O request. + * @lpm: defines the channel path to be used for a specific I/O request. A + * value of 0 will make cio use the opm. + * @key: storage key to be used for the I/O + * @flags: additional flags; defines the action to be performed for I/O + * processing. + * + * Start a S/390 channel program. When the interrupt arrives, the + * IRQ handler is called, either immediately, delayed (dev-end missing, + * or sense required) or never (no IRQ handler registered). + * Returns: + * %0, if the operation was successful; + * -%EBUSY, if the device is busy, or status pending; + * -%EACCES, if no path specified in @lpm is operational; + * -%ENODEV, if the device is not operational. + * Context: + * Interrupts disabled, ccw device lock held + */ +int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa, + unsigned long intparm, __u8 lpm, __u8 key, + unsigned long flags) +{ + return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm, key, + flags, 0); +} + +/** + * ccw_device_start() - start a s390 channel program + * @cdev: target ccw device + * @cpa: logical start address of channel program + * @intparm: user specific interruption parameter; will be presented back to + * @cdev's interrupt handler. Allows a device driver to associate + * the interrupt with a particular I/O request. + * @lpm: defines the channel path to be used for a specific I/O request. A + * value of 0 will make cio use the opm. + * @flags: additional flags; defines the action to be performed for I/O + * processing. + * + * Start a S/390 channel program. When the interrupt arrives, the + * IRQ handler is called, either immediately, delayed (dev-end missing, + * or sense required) or never (no IRQ handler registered). + * Returns: + * %0, if the operation was successful; + * -%EBUSY, if the device is busy, or status pending; + * -%EACCES, if no path specified in @lpm is operational; + * -%ENODEV, if the device is not operational. + * Context: + * Interrupts disabled, ccw device lock held + */ +int ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa, + unsigned long intparm, __u8 lpm, unsigned long flags) +{ + return ccw_device_start_key(cdev, cpa, intparm, lpm, + PAGE_DEFAULT_KEY, flags); +} + +/** + * ccw_device_start_timeout() - start a s390 channel program with timeout + * @cdev: target ccw device + * @cpa: logical start address of channel program + * @intparm: user specific interruption parameter; will be presented back to + * @cdev's interrupt handler. Allows a device driver to associate + * the interrupt with a particular I/O request. + * @lpm: defines the channel path to be used for a specific I/O request. A + * value of 0 will make cio use the opm. + * @flags: additional flags; defines the action to be performed for I/O + * processing. + * @expires: timeout value in jiffies + * + * Start a S/390 channel program. When the interrupt arrives, the + * IRQ handler is called, either immediately, delayed (dev-end missing, + * or sense required) or never (no IRQ handler registered). + * This function notifies the device driver if the channel program has not + * completed during the time specified by @expires. If a timeout occurs, the + * channel program is terminated via xsch, hsch or csch, and the device's + * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT). + * Returns: + * %0, if the operation was successful; + * -%EBUSY, if the device is busy, or status pending; + * -%EACCES, if no path specified in @lpm is operational; + * -%ENODEV, if the device is not operational. + * Context: + * Interrupts disabled, ccw device lock held + */ +int ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa, + unsigned long intparm, __u8 lpm, + unsigned long flags, int expires) +{ + return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm, + PAGE_DEFAULT_KEY, flags, + expires); +} + + +/** + * ccw_device_halt() - halt I/O request processing + * @cdev: target ccw device + * @intparm: interruption parameter; value is only used if no I/O is + * outstanding, otherwise the intparm associated with the I/O request + * is returned + * + * ccw_device_halt() calls hsch on @cdev's subchannel. + * Returns: + * %0 on success, + * -%ENODEV on device not operational, + * -%EINVAL on invalid device state, + * -%EBUSY on device busy or interrupt pending. + * Context: + * Interrupts disabled, ccw device lock held + */ +int ccw_device_halt(struct ccw_device *cdev, unsigned long intparm) +{ + struct subchannel *sch; + int ret; + + if (!cdev || !cdev->dev.parent) + return -ENODEV; + sch = to_subchannel(cdev->dev.parent); + if (!sch->schib.pmcw.ena) + return -EINVAL; + if (cdev->private->state == DEV_STATE_NOT_OPER) + return -ENODEV; + if (cdev->private->state != DEV_STATE_ONLINE && + cdev->private->state != DEV_STATE_W4SENSE) + return -EINVAL; + + ret = cio_halt(sch); + if (ret == 0) + cdev->private->intparm = intparm; + return ret; +} + +/** + * ccw_device_resume() - resume channel program execution + * @cdev: target ccw device + * + * ccw_device_resume() calls rsch on @cdev's subchannel. + * Returns: + * %0 on success, + * -%ENODEV on device not operational, + * -%EINVAL on invalid device state, + * -%EBUSY on device busy or interrupt pending. + * Context: + * Interrupts disabled, ccw device lock held + */ +int ccw_device_resume(struct ccw_device *cdev) +{ + struct subchannel *sch; + + if (!cdev || !cdev->dev.parent) + return -ENODEV; + sch = to_subchannel(cdev->dev.parent); + if (!sch->schib.pmcw.ena) + return -EINVAL; + if (cdev->private->state == DEV_STATE_NOT_OPER) + return -ENODEV; + if (cdev->private->state != DEV_STATE_ONLINE || + !(sch->schib.scsw.cmd.actl & SCSW_ACTL_SUSPENDED)) + return -EINVAL; + return cio_resume(sch); +} + +/** + * ccw_device_get_ciw() - Search for CIW command in extended sense data. + * @cdev: ccw device to inspect + * @ct: command type to look for + * + * During SenseID, command information words (CIWs) describing special + * commands available to the device may have been stored in the extended + * sense data. This function searches for CIWs of a specified command + * type in the extended sense data. + * Returns: + * %NULL if no extended sense data has been stored or if no CIW of the + * specified command type could be found, + * else a pointer to the CIW of the specified command type. + */ +struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct) +{ + int ciw_cnt; + + if (cdev->private->flags.esid == 0) + return NULL; + for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++) + if (cdev->private->senseid.ciw[ciw_cnt].ct == ct) + return cdev->private->senseid.ciw + ciw_cnt; + return NULL; +} + +/** + * ccw_device_get_path_mask() - get currently available paths + * @cdev: ccw device to be queried + * Returns: + * %0 if no subchannel for the device is available, + * else the mask of currently available paths for the ccw device's subchannel. + */ +__u8 ccw_device_get_path_mask(struct ccw_device *cdev) +{ + struct subchannel *sch; + + if (!cdev->dev.parent) + return 0; + + sch = to_subchannel(cdev->dev.parent); + return sch->lpm; +} + +/** + * ccw_device_get_chp_desc() - return newly allocated channel-path descriptor + * @cdev: device to obtain the descriptor for + * @chp_idx: index of the channel path + * + * On success return a newly allocated copy of the channel-path description + * data associated with the given channel path. Return %NULL on error. + */ +struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *cdev, + int chp_idx) +{ + struct subchannel *sch; + struct chp_id chpid; + + sch = to_subchannel(cdev->dev.parent); + chp_id_init(&chpid); + chpid.id = sch->schib.pmcw.chpid[chp_idx]; + return chp_get_chp_desc(chpid); +} + +/** + * ccw_device_get_util_str() - return newly allocated utility strings + * @cdev: device to obtain the utility strings for + * @chp_idx: index of the channel path + * + * On success return a newly allocated copy of the utility strings + * associated with the given channel path. Return %NULL on error. + */ +u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct channel_path *chp; + struct chp_id chpid; + u8 *util_str; + + chp_id_init(&chpid); + chpid.id = sch->schib.pmcw.chpid[chp_idx]; + chp = chpid_to_chp(chpid); + + util_str = kmalloc(sizeof(chp->desc_fmt3.util_str), GFP_KERNEL); + if (!util_str) + return NULL; + + mutex_lock(&chp->lock); + memcpy(util_str, chp->desc_fmt3.util_str, sizeof(chp->desc_fmt3.util_str)); + mutex_unlock(&chp->lock); + + return util_str; +} + +/** + * ccw_device_get_id() - obtain a ccw device id + * @cdev: device to obtain the id for + * @dev_id: where to fill in the values + */ +void ccw_device_get_id(struct ccw_device *cdev, struct ccw_dev_id *dev_id) +{ + *dev_id = cdev->private->dev_id; +} +EXPORT_SYMBOL(ccw_device_get_id); + +/** + * ccw_device_tm_start_timeout_key() - perform start function + * @cdev: ccw device on which to perform the start function + * @tcw: transport-command word to be started + * @intparm: user defined parameter to be passed to the interrupt handler + * @lpm: mask of paths to use + * @key: storage key to use for storage access + * @expires: time span in jiffies after which to abort request + * + * Start the tcw on the given ccw device. Return zero on success, non-zero + * otherwise. + */ +int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw, + unsigned long intparm, u8 lpm, u8 key, + int expires) +{ + struct subchannel *sch; + int rc; + + sch = to_subchannel(cdev->dev.parent); + if (!sch->schib.pmcw.ena) + return -EINVAL; + if (cdev->private->state == DEV_STATE_VERIFY) { + /* Remember to fake irb when finished. */ + if (!cdev->private->flags.fake_irb) { + cdev->private->flags.fake_irb = FAKE_TM_IRB; + cdev->private->intparm = intparm; + return 0; + } else + /* There's already a fake I/O around. */ + return -EBUSY; + } + if (cdev->private->state != DEV_STATE_ONLINE) + return -EIO; + /* Adjust requested path mask to exclude unusable paths. */ + if (lpm) { + lpm &= sch->lpm; + if (lpm == 0) + return -EACCES; + } + rc = cio_tm_start_key(sch, tcw, lpm, key); + if (rc == 0) { + cdev->private->intparm = intparm; + if (expires) + ccw_device_set_timeout(cdev, expires); + } + return rc; +} +EXPORT_SYMBOL(ccw_device_tm_start_timeout_key); + +/** + * ccw_device_tm_start_key() - perform start function + * @cdev: ccw device on which to perform the start function + * @tcw: transport-command word to be started + * @intparm: user defined parameter to be passed to the interrupt handler + * @lpm: mask of paths to use + * @key: storage key to use for storage access + * + * Start the tcw on the given ccw device. Return zero on success, non-zero + * otherwise. + */ +int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw, + unsigned long intparm, u8 lpm, u8 key) +{ + return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm, key, 0); +} +EXPORT_SYMBOL(ccw_device_tm_start_key); + +/** + * ccw_device_tm_start() - perform start function + * @cdev: ccw device on which to perform the start function + * @tcw: transport-command word to be started + * @intparm: user defined parameter to be passed to the interrupt handler + * @lpm: mask of paths to use + * + * Start the tcw on the given ccw device. Return zero on success, non-zero + * otherwise. + */ +int ccw_device_tm_start(struct ccw_device *cdev, struct tcw *tcw, + unsigned long intparm, u8 lpm) +{ + return ccw_device_tm_start_key(cdev, tcw, intparm, lpm, + PAGE_DEFAULT_KEY); +} +EXPORT_SYMBOL(ccw_device_tm_start); + +/** + * ccw_device_tm_start_timeout() - perform start function + * @cdev: ccw device on which to perform the start function + * @tcw: transport-command word to be started + * @intparm: user defined parameter to be passed to the interrupt handler + * @lpm: mask of paths to use + * @expires: time span in jiffies after which to abort request + * + * Start the tcw on the given ccw device. Return zero on success, non-zero + * otherwise. + */ +int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw, + unsigned long intparm, u8 lpm, int expires) +{ + return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm, + PAGE_DEFAULT_KEY, expires); +} +EXPORT_SYMBOL(ccw_device_tm_start_timeout); + +/** + * ccw_device_get_mdc() - accumulate max data count + * @cdev: ccw device for which the max data count is accumulated + * @mask: mask of paths to use + * + * Return the number of 64K-bytes blocks all paths at least support + * for a transport command. Return value 0 indicates failure. + */ +int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct channel_path *chp; + struct chp_id chpid; + int mdc = 0, i; + + /* Adjust requested path mask to excluded varied off paths. */ + if (mask) + mask &= sch->lpm; + else + mask = sch->lpm; + + chp_id_init(&chpid); + for (i = 0; i < 8; i++) { + if (!(mask & (0x80 >> i))) + continue; + chpid.id = sch->schib.pmcw.chpid[i]; + chp = chpid_to_chp(chpid); + if (!chp) + continue; + + mutex_lock(&chp->lock); + if (!chp->desc_fmt1.f) { + mutex_unlock(&chp->lock); + return 0; + } + if (!chp->desc_fmt1.r) + mdc = 1; + mdc = mdc ? min_t(int, mdc, chp->desc_fmt1.mdc) : + chp->desc_fmt1.mdc; + mutex_unlock(&chp->lock); + } + + return mdc; +} +EXPORT_SYMBOL(ccw_device_get_mdc); + +/** + * ccw_device_tm_intrg() - perform interrogate function + * @cdev: ccw device on which to perform the interrogate function + * + * Perform an interrogate function on the given ccw device. Return zero on + * success, non-zero otherwise. + */ +int ccw_device_tm_intrg(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + if (!sch->schib.pmcw.ena) + return -EINVAL; + if (cdev->private->state != DEV_STATE_ONLINE) + return -EIO; + if (!scsw_is_tm(&sch->schib.scsw) || + !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_START_PEND)) + return -EINVAL; + return cio_tm_intrg(sch); +} +EXPORT_SYMBOL(ccw_device_tm_intrg); + +/** + * ccw_device_get_schid() - obtain a subchannel id + * @cdev: device to obtain the id for + * @schid: where to fill in the values + */ +void ccw_device_get_schid(struct ccw_device *cdev, struct subchannel_id *schid) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + + *schid = sch->schid; +} +EXPORT_SYMBOL_GPL(ccw_device_get_schid); + +EXPORT_SYMBOL(ccw_device_set_options_mask); +EXPORT_SYMBOL(ccw_device_set_options); +EXPORT_SYMBOL(ccw_device_clear_options); +EXPORT_SYMBOL(ccw_device_clear); +EXPORT_SYMBOL(ccw_device_halt); +EXPORT_SYMBOL(ccw_device_resume); +EXPORT_SYMBOL(ccw_device_start_timeout); +EXPORT_SYMBOL(ccw_device_start); +EXPORT_SYMBOL(ccw_device_start_timeout_key); +EXPORT_SYMBOL(ccw_device_start_key); +EXPORT_SYMBOL(ccw_device_get_ciw); +EXPORT_SYMBOL(ccw_device_get_path_mask); +EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc); +EXPORT_SYMBOL_GPL(ccw_device_get_util_str); diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c new file mode 100644 index 000000000..d30a3babf --- /dev/null +++ b/drivers/s390/cio/device_pgid.c @@ -0,0 +1,724 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * CCW device PGID and path verification I/O handling. + * + * Copyright IBM Corp. 2002, 2009 + * Author(s): Cornelia Huck + * Martin Schwidefsky + * Peter Oberparleiter + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "cio.h" +#include "cio_debug.h" +#include "device.h" +#include "io_sch.h" + +#define PGID_RETRIES 256 +#define PGID_TIMEOUT (10 * HZ) + +static void verify_start(struct ccw_device *cdev); + +/* + * Process path verification data and report result. + */ +static void verify_done(struct ccw_device *cdev, int rc) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_dev_id *id = &cdev->private->dev_id; + int mpath = cdev->private->flags.mpath; + int pgroup = cdev->private->flags.pgroup; + + if (rc) + goto out; + /* Ensure consistent multipathing state at device and channel. */ + if (sch->config.mp != mpath) { + sch->config.mp = mpath; + rc = cio_commit_config(sch); + } +out: + CIO_MSG_EVENT(2, "vrfy: device 0.%x.%04x: rc=%d pgroup=%d mpath=%d " + "vpm=%02x\n", id->ssid, id->devno, rc, pgroup, mpath, + sch->vpm); + ccw_device_verify_done(cdev, rc); +} + +/* + * Create channel program to perform a NOOP. + */ +static void nop_build_cp(struct ccw_device *cdev) +{ + struct ccw_request *req = &cdev->private->req; + struct ccw1 *cp = cdev->private->iccws; + + cp->cmd_code = CCW_CMD_NOOP; + cp->cda = 0; + cp->count = 0; + cp->flags = CCW_FLAG_SLI; + req->cp = cp; +} + +/* + * Perform NOOP on a single path. + */ +static void nop_do(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + + req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & sch->opm & + ~cdev->private->path_noirq_mask); + if (!req->lpm) + goto out_nopath; + nop_build_cp(cdev); + ccw_request_start(cdev); + return; + +out_nopath: + verify_done(cdev, sch->vpm ? 0 : -EACCES); +} + +/* + * Adjust NOOP I/O status. + */ +static enum io_status nop_filter(struct ccw_device *cdev, void *data, + struct irb *irb, enum io_status status) +{ + /* Only subchannel status might indicate a path error. */ + if (status == IO_STATUS_ERROR && irb->scsw.cmd.cstat == 0) + return IO_DONE; + return status; +} + +/* + * Process NOOP request result for a single path. + */ +static void nop_callback(struct ccw_device *cdev, void *data, int rc) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + + switch (rc) { + case 0: + sch->vpm |= req->lpm; + break; + case -ETIME: + cdev->private->path_noirq_mask |= req->lpm; + break; + case -EACCES: + cdev->private->path_notoper_mask |= req->lpm; + break; + default: + goto err; + } + /* Continue on the next path. */ + req->lpm >>= 1; + nop_do(cdev); + return; + +err: + verify_done(cdev, rc); +} + +/* + * Create channel program to perform SET PGID on a single path. + */ +static void spid_build_cp(struct ccw_device *cdev, u8 fn) +{ + struct ccw_request *req = &cdev->private->req; + struct ccw1 *cp = cdev->private->iccws; + int i = pathmask_to_pos(req->lpm); + struct pgid *pgid = &cdev->private->pgid[i]; + + pgid->inf.fc = fn; + cp->cmd_code = CCW_CMD_SET_PGID; + cp->cda = (u32) (addr_t) pgid; + cp->count = sizeof(*pgid); + cp->flags = CCW_FLAG_SLI; + req->cp = cp; +} + +static void pgid_wipeout_callback(struct ccw_device *cdev, void *data, int rc) +{ + if (rc) { + /* We don't know the path groups' state. Abort. */ + verify_done(cdev, rc); + return; + } + /* + * Path groups have been reset. Restart path verification but + * leave paths in path_noirq_mask out. + */ + cdev->private->flags.pgid_unknown = 0; + verify_start(cdev); +} + +/* + * Reset pathgroups and restart path verification, leave unusable paths out. + */ +static void pgid_wipeout_start(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_dev_id *id = &cdev->private->dev_id; + struct ccw_request *req = &cdev->private->req; + u8 fn; + + CIO_MSG_EVENT(2, "wipe: device 0.%x.%04x: pvm=%02x nim=%02x\n", + id->ssid, id->devno, cdev->private->pgid_valid_mask, + cdev->private->path_noirq_mask); + + /* Initialize request data. */ + memset(req, 0, sizeof(*req)); + req->timeout = PGID_TIMEOUT; + req->maxretries = PGID_RETRIES; + req->lpm = sch->schib.pmcw.pam; + req->callback = pgid_wipeout_callback; + fn = SPID_FUNC_DISBAND; + if (cdev->private->flags.mpath) + fn |= SPID_FUNC_MULTI_PATH; + spid_build_cp(cdev, fn); + ccw_request_start(cdev); +} + +/* + * Perform establish/resign SET PGID on a single path. + */ +static void spid_do(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + u8 fn; + + /* Use next available path that is not already in correct state. */ + req->lpm = lpm_adjust(req->lpm, cdev->private->pgid_todo_mask); + if (!req->lpm) + goto out_nopath; + /* Channel program setup. */ + if (req->lpm & sch->opm) + fn = SPID_FUNC_ESTABLISH; + else + fn = SPID_FUNC_RESIGN; + if (cdev->private->flags.mpath) + fn |= SPID_FUNC_MULTI_PATH; + spid_build_cp(cdev, fn); + ccw_request_start(cdev); + return; + +out_nopath: + if (cdev->private->flags.pgid_unknown) { + /* At least one SPID could be partially done. */ + pgid_wipeout_start(cdev); + return; + } + verify_done(cdev, sch->vpm ? 0 : -EACCES); +} + +/* + * Process SET PGID request result for a single path. + */ +static void spid_callback(struct ccw_device *cdev, void *data, int rc) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + + switch (rc) { + case 0: + sch->vpm |= req->lpm & sch->opm; + break; + case -ETIME: + cdev->private->flags.pgid_unknown = 1; + cdev->private->path_noirq_mask |= req->lpm; + break; + case -EACCES: + cdev->private->path_notoper_mask |= req->lpm; + break; + case -EOPNOTSUPP: + if (cdev->private->flags.mpath) { + /* Try without multipathing. */ + cdev->private->flags.mpath = 0; + goto out_restart; + } + /* Try without pathgrouping. */ + cdev->private->flags.pgroup = 0; + goto out_restart; + default: + goto err; + } + req->lpm >>= 1; + spid_do(cdev); + return; + +out_restart: + verify_start(cdev); + return; +err: + verify_done(cdev, rc); +} + +static void spid_start(struct ccw_device *cdev) +{ + struct ccw_request *req = &cdev->private->req; + + /* Initialize request data. */ + memset(req, 0, sizeof(*req)); + req->timeout = PGID_TIMEOUT; + req->maxretries = PGID_RETRIES; + req->lpm = 0x80; + req->singlepath = 1; + req->callback = spid_callback; + spid_do(cdev); +} + +static int pgid_is_reset(struct pgid *p) +{ + char *c; + + for (c = (char *)p + 1; c < (char *)(p + 1); c++) { + if (*c != 0) + return 0; + } + return 1; +} + +static int pgid_cmp(struct pgid *p1, struct pgid *p2) +{ + return memcmp((char *) p1 + 1, (char *) p2 + 1, + sizeof(struct pgid) - 1); +} + +/* + * Determine pathgroup state from PGID data. + */ +static void pgid_analyze(struct ccw_device *cdev, struct pgid **p, + int *mismatch, u8 *reserved, u8 *reset) +{ + struct pgid *pgid = &cdev->private->pgid[0]; + struct pgid *first = NULL; + int lpm; + int i; + + *mismatch = 0; + *reserved = 0; + *reset = 0; + for (i = 0, lpm = 0x80; i < 8; i++, pgid++, lpm >>= 1) { + if ((cdev->private->pgid_valid_mask & lpm) == 0) + continue; + if (pgid->inf.ps.state2 == SNID_STATE2_RESVD_ELSE) + *reserved |= lpm; + if (pgid_is_reset(pgid)) { + *reset |= lpm; + continue; + } + if (!first) { + first = pgid; + continue; + } + if (pgid_cmp(pgid, first) != 0) + *mismatch = 1; + } + if (!first) + first = &channel_subsystems[0]->global_pgid; + *p = first; +} + +static u8 pgid_to_donepm(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct pgid *pgid; + int i; + int lpm; + u8 donepm = 0; + + /* Set bits for paths which are already in the target state. */ + for (i = 0; i < 8; i++) { + lpm = 0x80 >> i; + if ((cdev->private->pgid_valid_mask & lpm) == 0) + continue; + pgid = &cdev->private->pgid[i]; + if (sch->opm & lpm) { + if (pgid->inf.ps.state1 != SNID_STATE1_GROUPED) + continue; + } else { + if (pgid->inf.ps.state1 != SNID_STATE1_UNGROUPED) + continue; + } + if (cdev->private->flags.mpath) { + if (pgid->inf.ps.state3 != SNID_STATE3_MULTI_PATH) + continue; + } else { + if (pgid->inf.ps.state3 != SNID_STATE3_SINGLE_PATH) + continue; + } + donepm |= lpm; + } + + return donepm; +} + +static void pgid_fill(struct ccw_device *cdev, struct pgid *pgid) +{ + int i; + + for (i = 0; i < 8; i++) + memcpy(&cdev->private->pgid[i], pgid, sizeof(struct pgid)); +} + +/* + * Process SENSE PGID data and report result. + */ +static void snid_done(struct ccw_device *cdev, int rc) +{ + struct ccw_dev_id *id = &cdev->private->dev_id; + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct pgid *pgid; + int mismatch = 0; + u8 reserved = 0; + u8 reset = 0; + u8 donepm; + + if (rc) + goto out; + pgid_analyze(cdev, &pgid, &mismatch, &reserved, &reset); + if (reserved == cdev->private->pgid_valid_mask) + rc = -EUSERS; + else if (mismatch) + rc = -EOPNOTSUPP; + else { + donepm = pgid_to_donepm(cdev); + sch->vpm = donepm & sch->opm; + cdev->private->pgid_reset_mask |= reset; + cdev->private->pgid_todo_mask &= + ~(donepm | cdev->private->path_noirq_mask); + pgid_fill(cdev, pgid); + } +out: + CIO_MSG_EVENT(2, "snid: device 0.%x.%04x: rc=%d pvm=%02x vpm=%02x " + "todo=%02x mism=%d rsvd=%02x reset=%02x\n", id->ssid, + id->devno, rc, cdev->private->pgid_valid_mask, sch->vpm, + cdev->private->pgid_todo_mask, mismatch, reserved, reset); + switch (rc) { + case 0: + if (cdev->private->flags.pgid_unknown) { + pgid_wipeout_start(cdev); + return; + } + /* Anything left to do? */ + if (cdev->private->pgid_todo_mask == 0) { + verify_done(cdev, sch->vpm == 0 ? -EACCES : 0); + return; + } + /* Perform path-grouping. */ + spid_start(cdev); + break; + case -EOPNOTSUPP: + /* Path-grouping not supported. */ + cdev->private->flags.pgroup = 0; + cdev->private->flags.mpath = 0; + verify_start(cdev); + break; + default: + verify_done(cdev, rc); + } +} + +/* + * Create channel program to perform a SENSE PGID on a single path. + */ +static void snid_build_cp(struct ccw_device *cdev) +{ + struct ccw_request *req = &cdev->private->req; + struct ccw1 *cp = cdev->private->iccws; + int i = pathmask_to_pos(req->lpm); + + /* Channel program setup. */ + cp->cmd_code = CCW_CMD_SENSE_PGID; + cp->cda = (u32) (addr_t) &cdev->private->pgid[i]; + cp->count = sizeof(struct pgid); + cp->flags = CCW_FLAG_SLI; + req->cp = cp; +} + +/* + * Perform SENSE PGID on a single path. + */ +static void snid_do(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + int ret; + + req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & + ~cdev->private->path_noirq_mask); + if (!req->lpm) + goto out_nopath; + snid_build_cp(cdev); + ccw_request_start(cdev); + return; + +out_nopath: + if (cdev->private->pgid_valid_mask) + ret = 0; + else if (cdev->private->path_noirq_mask) + ret = -ETIME; + else + ret = -EACCES; + snid_done(cdev, ret); +} + +/* + * Process SENSE PGID request result for single path. + */ +static void snid_callback(struct ccw_device *cdev, void *data, int rc) +{ + struct ccw_request *req = &cdev->private->req; + + switch (rc) { + case 0: + cdev->private->pgid_valid_mask |= req->lpm; + break; + case -ETIME: + cdev->private->flags.pgid_unknown = 1; + cdev->private->path_noirq_mask |= req->lpm; + break; + case -EACCES: + cdev->private->path_notoper_mask |= req->lpm; + break; + default: + goto err; + } + /* Continue on the next path. */ + req->lpm >>= 1; + snid_do(cdev); + return; + +err: + snid_done(cdev, rc); +} + +/* + * Perform path verification. + */ +static void verify_start(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + struct ccw_dev_id *devid = &cdev->private->dev_id; + + sch->vpm = 0; + sch->lpm = sch->schib.pmcw.pam; + + /* Initialize PGID data. */ + memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid)); + cdev->private->pgid_valid_mask = 0; + cdev->private->pgid_todo_mask = sch->schib.pmcw.pam; + cdev->private->path_notoper_mask = 0; + + /* Initialize request data. */ + memset(req, 0, sizeof(*req)); + req->timeout = PGID_TIMEOUT; + req->maxretries = PGID_RETRIES; + req->lpm = 0x80; + req->singlepath = 1; + if (cdev->private->flags.pgroup) { + CIO_TRACE_EVENT(4, "snid"); + CIO_HEX_EVENT(4, devid, sizeof(*devid)); + req->callback = snid_callback; + snid_do(cdev); + } else { + CIO_TRACE_EVENT(4, "nop"); + CIO_HEX_EVENT(4, devid, sizeof(*devid)); + req->filter = nop_filter; + req->callback = nop_callback; + nop_do(cdev); + } +} + +/** + * ccw_device_verify_start - perform path verification + * @cdev: ccw device + * + * Perform an I/O on each available channel path to @cdev to determine which + * paths are operational. The resulting path mask is stored in sch->vpm. + * If device options specify pathgrouping, establish a pathgroup for the + * operational paths. When finished, call ccw_device_verify_done with a + * return code specifying the result. + */ +void ccw_device_verify_start(struct ccw_device *cdev) +{ + CIO_TRACE_EVENT(4, "vrfy"); + CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); + /* + * Initialize pathgroup and multipath state with target values. + * They may change in the course of path verification. + */ + cdev->private->flags.pgroup = cdev->private->options.pgroup; + cdev->private->flags.mpath = cdev->private->options.mpath; + cdev->private->flags.doverify = 0; + cdev->private->path_noirq_mask = 0; + verify_start(cdev); +} + +/* + * Process disband SET PGID request result. + */ +static void disband_callback(struct ccw_device *cdev, void *data, int rc) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_dev_id *id = &cdev->private->dev_id; + + if (rc) + goto out; + /* Ensure consistent multipathing state at device and channel. */ + cdev->private->flags.mpath = 0; + if (sch->config.mp) { + sch->config.mp = 0; + rc = cio_commit_config(sch); + } +out: + CIO_MSG_EVENT(0, "disb: device 0.%x.%04x: rc=%d\n", id->ssid, id->devno, + rc); + ccw_device_disband_done(cdev, rc); +} + +/** + * ccw_device_disband_start - disband pathgroup + * @cdev: ccw device + * + * Execute a SET PGID channel program on @cdev to disband a previously + * established pathgroup. When finished, call ccw_device_disband_done with + * a return code specifying the result. + */ +void ccw_device_disband_start(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + u8 fn; + + CIO_TRACE_EVENT(4, "disb"); + CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); + /* Request setup. */ + memset(req, 0, sizeof(*req)); + req->timeout = PGID_TIMEOUT; + req->maxretries = PGID_RETRIES; + req->lpm = sch->schib.pmcw.pam & sch->opm; + req->singlepath = 1; + req->callback = disband_callback; + fn = SPID_FUNC_DISBAND; + if (cdev->private->flags.mpath) + fn |= SPID_FUNC_MULTI_PATH; + spid_build_cp(cdev, fn); + ccw_request_start(cdev); +} + +struct stlck_data { + struct completion done; + int rc; +}; + +static void stlck_build_cp(struct ccw_device *cdev, void *buf1, void *buf2) +{ + struct ccw_request *req = &cdev->private->req; + struct ccw1 *cp = cdev->private->iccws; + + cp[0].cmd_code = CCW_CMD_STLCK; + cp[0].cda = (u32) (addr_t) buf1; + cp[0].count = 32; + cp[0].flags = CCW_FLAG_CC; + cp[1].cmd_code = CCW_CMD_RELEASE; + cp[1].cda = (u32) (addr_t) buf2; + cp[1].count = 32; + cp[1].flags = 0; + req->cp = cp; +} + +static void stlck_callback(struct ccw_device *cdev, void *data, int rc) +{ + struct stlck_data *sdata = data; + + sdata->rc = rc; + complete(&sdata->done); +} + +/** + * ccw_device_stlck_start - perform unconditional release + * @cdev: ccw device + * @data: data pointer to be passed to ccw_device_stlck_done + * @buf1: data pointer used in channel program + * @buf2: data pointer used in channel program + * + * Execute a channel program on @cdev to release an existing PGID reservation. + */ +static void ccw_device_stlck_start(struct ccw_device *cdev, void *data, + void *buf1, void *buf2) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + + CIO_TRACE_EVENT(4, "stlck"); + CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); + /* Request setup. */ + memset(req, 0, sizeof(*req)); + req->timeout = PGID_TIMEOUT; + req->maxretries = PGID_RETRIES; + req->lpm = sch->schib.pmcw.pam & sch->opm; + req->data = data; + req->callback = stlck_callback; + stlck_build_cp(cdev, buf1, buf2); + ccw_request_start(cdev); +} + +/* + * Perform unconditional reserve + release. + */ +int ccw_device_stlck(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct stlck_data data; + u8 *buffer; + int rc; + + /* Check if steal lock operation is valid for this device. */ + if (cdev->drv) { + if (!cdev->private->options.force) + return -EINVAL; + } + buffer = kzalloc(64, GFP_DMA | GFP_KERNEL); + if (!buffer) + return -ENOMEM; + init_completion(&data.done); + data.rc = -EIO; + spin_lock_irq(sch->lock); + rc = cio_enable_subchannel(sch, (u32) (addr_t) sch); + if (rc) + goto out_unlock; + /* Perform operation. */ + cdev->private->state = DEV_STATE_STEAL_LOCK; + ccw_device_stlck_start(cdev, &data, &buffer[0], &buffer[32]); + spin_unlock_irq(sch->lock); + /* Wait for operation to finish. */ + if (wait_for_completion_interruptible(&data.done)) { + /* Got a signal. */ + spin_lock_irq(sch->lock); + ccw_request_cancel(cdev); + spin_unlock_irq(sch->lock); + wait_for_completion(&data.done); + } + rc = data.rc; + /* Check results. */ + spin_lock_irq(sch->lock); + cio_disable_subchannel(sch); + cdev->private->state = DEV_STATE_BOXED; +out_unlock: + spin_unlock_irq(sch->lock); + kfree(buffer); + + return rc; +} diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c new file mode 100644 index 000000000..7d5c7892b --- /dev/null +++ b/drivers/s390/cio/device_status.c @@ -0,0 +1,399 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2002 + * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) + * Martin Schwidefsky (schwidefsky@de.ibm.com) + * + * Status accumulation and basic sense functions. + */ + +#include +#include + +#include +#include + +#include "cio.h" +#include "cio_debug.h" +#include "css.h" +#include "device.h" +#include "ioasm.h" +#include "io_sch.h" + +/* + * Check for any kind of channel or interface control check but don't + * issue the message for the console device + */ +static void +ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + char dbf_text[15]; + + if (!scsw_is_valid_cstat(&irb->scsw) || + !(scsw_cstat(&irb->scsw) & (SCHN_STAT_CHN_DATA_CHK | + SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK))) + return; + CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check " + "received" + " ... device %04x on subchannel 0.%x.%04x, dev_stat " + ": %02X sch_stat : %02X\n", + cdev->private->dev_id.devno, sch->schid.ssid, + sch->schid.sch_no, + scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw)); + sprintf(dbf_text, "chk%x", sch->schid.sch_no); + CIO_TRACE_EVENT(0, dbf_text); + CIO_HEX_EVENT(0, irb, sizeof(struct irb)); +} + +/* + * Some paths became not operational (pno bit in scsw is set). + */ +static void +ccw_device_path_notoper(struct ccw_device *cdev) +{ + struct subchannel *sch; + + sch = to_subchannel(cdev->dev.parent); + if (cio_update_schib(sch)) + goto doverify; + + CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are " + "not operational \n", __func__, + sch->schid.ssid, sch->schid.sch_no, + sch->schib.pmcw.pnom); + + sch->lpm &= ~sch->schib.pmcw.pnom; +doverify: + cdev->private->flags.doverify = 1; +} + +/* + * Copy valid bits from the extended control word to device irb. + */ +static void +ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb) +{ + /* + * Copy extended control bit if it is valid... yes there + * are condition that have to be met for the extended control + * bit to have meaning. Sick. + */ + cdev->private->irb.scsw.cmd.ectl = 0; + if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) && + !(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS)) + cdev->private->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl; + /* Check if extended control word is valid. */ + if (!cdev->private->irb.scsw.cmd.ectl) + return; + /* Copy concurrent sense / model dependent information. */ + memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw)); +} + +/* + * Check if extended status word is valid. + */ +static int +ccw_device_accumulate_esw_valid(struct irb *irb) +{ + if (!irb->scsw.cmd.eswf && + (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND)) + return 0; + if (irb->scsw.cmd.stctl == + (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) && + !(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)) + return 0; + return 1; +} + +/* + * Copy valid bits from the extended status word to device irb. + */ +static void +ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb) +{ + struct irb *cdev_irb; + struct sublog *cdev_sublog, *sublog; + + if (!ccw_device_accumulate_esw_valid(irb)) + return; + + cdev_irb = &cdev->private->irb; + + /* Copy last path used mask. */ + cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum; + + /* Copy subchannel logout information if esw is of format 0. */ + if (irb->scsw.cmd.eswf) { + cdev_sublog = &cdev_irb->esw.esw0.sublog; + sublog = &irb->esw.esw0.sublog; + /* Copy extended status flags. */ + cdev_sublog->esf = sublog->esf; + /* + * Copy fields that have a meaning for channel data check + * channel control check and interface control check. + */ + if (irb->scsw.cmd.cstat & (SCHN_STAT_CHN_DATA_CHK | + SCHN_STAT_CHN_CTRL_CHK | + SCHN_STAT_INTF_CTRL_CHK)) { + /* Copy ancillary report bit. */ + cdev_sublog->arep = sublog->arep; + /* Copy field-validity-flags. */ + cdev_sublog->fvf = sublog->fvf; + /* Copy storage access code. */ + cdev_sublog->sacc = sublog->sacc; + /* Copy termination code. */ + cdev_sublog->termc = sublog->termc; + /* Copy sequence code. */ + cdev_sublog->seqc = sublog->seqc; + } + /* Copy device status check. */ + cdev_sublog->devsc = sublog->devsc; + /* Copy secondary error. */ + cdev_sublog->serr = sublog->serr; + /* Copy i/o-error alert. */ + cdev_sublog->ioerr = sublog->ioerr; + /* Copy channel path timeout bit. */ + if (irb->scsw.cmd.cstat & SCHN_STAT_INTF_CTRL_CHK) + cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt; + /* Copy failing storage address validity flag. */ + cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf; + if (cdev_irb->esw.esw0.erw.fsavf) { + /* ... and copy the failing storage address. */ + memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr, + sizeof (irb->esw.esw0.faddr)); + /* ... and copy the failing storage address format. */ + cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf; + } + /* Copy secondary ccw address validity bit. */ + cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf; + if (irb->esw.esw0.erw.scavf) + /* ... and copy the secondary ccw address. */ + cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr; + + } + /* FIXME: DCTI for format 2? */ + + /* Copy authorization bit. */ + cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth; + /* Copy path verification required flag. */ + cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf; + if (irb->esw.esw0.erw.pvrf) + cdev->private->flags.doverify = 1; + /* Copy concurrent sense bit. */ + cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons; + if (irb->esw.esw0.erw.cons) + cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt; +} + +/* + * Accumulate status from irb to devstat. + */ +void +ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb) +{ + struct irb *cdev_irb; + + /* + * Check if the status pending bit is set in stctl. + * If not, the remaining bit have no meaning and we must ignore them. + * The esw is not meaningful as well... + */ + if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) + return; + + /* Check for channel checks and interface control checks. */ + ccw_device_msg_control_check(cdev, irb); + + /* Check for path not operational. */ + if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw)) + ccw_device_path_notoper(cdev); + /* No irb accumulation for transport mode irbs. */ + if (scsw_is_tm(&irb->scsw)) { + memcpy(&cdev->private->irb, irb, sizeof(struct irb)); + return; + } + /* + * Don't accumulate unsolicited interrupts. + */ + if (!scsw_is_solicited(&irb->scsw)) + return; + + cdev_irb = &cdev->private->irb; + + /* + * If the clear function had been performed, all formerly pending + * status at the subchannel has been cleared and we must not pass + * intermediate accumulated status to the device driver. + */ + if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC) + memset(&cdev->private->irb, 0, sizeof(struct irb)); + + /* Copy bits which are valid only for the start function. */ + if (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) { + /* Copy key. */ + cdev_irb->scsw.cmd.key = irb->scsw.cmd.key; + /* Copy suspend control bit. */ + cdev_irb->scsw.cmd.sctl = irb->scsw.cmd.sctl; + /* Accumulate deferred condition code. */ + cdev_irb->scsw.cmd.cc |= irb->scsw.cmd.cc; + /* Copy ccw format bit. */ + cdev_irb->scsw.cmd.fmt = irb->scsw.cmd.fmt; + /* Copy prefetch bit. */ + cdev_irb->scsw.cmd.pfch = irb->scsw.cmd.pfch; + /* Copy initial-status-interruption-control. */ + cdev_irb->scsw.cmd.isic = irb->scsw.cmd.isic; + /* Copy address limit checking control. */ + cdev_irb->scsw.cmd.alcc = irb->scsw.cmd.alcc; + /* Copy suppress suspend bit. */ + cdev_irb->scsw.cmd.ssi = irb->scsw.cmd.ssi; + } + + /* Take care of the extended control bit and extended control word. */ + ccw_device_accumulate_ecw(cdev, irb); + + /* Accumulate function control. */ + cdev_irb->scsw.cmd.fctl |= irb->scsw.cmd.fctl; + /* Copy activity control. */ + cdev_irb->scsw.cmd.actl = irb->scsw.cmd.actl; + /* Accumulate status control. */ + cdev_irb->scsw.cmd.stctl |= irb->scsw.cmd.stctl; + /* + * Copy ccw address if it is valid. This is a bit simplified + * but should be close enough for all practical purposes. + */ + if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) || + ((irb->scsw.cmd.stctl == + (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) && + (irb->scsw.cmd.actl & SCSW_ACTL_DEVACT) && + (irb->scsw.cmd.actl & SCSW_ACTL_SCHACT)) || + (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)) + cdev_irb->scsw.cmd.cpa = irb->scsw.cmd.cpa; + /* Accumulate device status, but not the device busy flag. */ + cdev_irb->scsw.cmd.dstat &= ~DEV_STAT_BUSY; + /* dstat is not always valid. */ + if (irb->scsw.cmd.stctl & + (SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS + | SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS)) + cdev_irb->scsw.cmd.dstat |= irb->scsw.cmd.dstat; + /* Accumulate subchannel status. */ + cdev_irb->scsw.cmd.cstat |= irb->scsw.cmd.cstat; + /* Copy residual count if it is valid. */ + if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) && + (irb->scsw.cmd.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN)) + == 0) + cdev_irb->scsw.cmd.count = irb->scsw.cmd.count; + + /* Take care of bits in the extended status word. */ + ccw_device_accumulate_esw(cdev, irb); + + /* + * Check whether we must issue a SENSE CCW ourselves if there is no + * concurrent sense facility installed for the subchannel. + * No sense is required if no delayed sense is pending + * and we did not get a unit check without sense information. + * + * Note: We should check for ioinfo[irq]->flags.consns but VM + * violates the ESA/390 architecture and doesn't present an + * operand exception for virtual devices without concurrent + * sense facility available/supported when enabling the + * concurrent sense facility. + */ + if ((cdev_irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && + !(cdev_irb->esw.esw0.erw.cons)) + cdev->private->flags.dosense = 1; +} + +/* + * Do a basic sense. + */ +int +ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb) +{ + struct subchannel *sch; + struct ccw1 *sense_ccw; + int rc; + + sch = to_subchannel(cdev->dev.parent); + + /* A sense is required, can we do it now ? */ + if (scsw_actl(&irb->scsw) & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) + /* + * we received an Unit Check but we have no final + * status yet, therefore we must delay the SENSE + * processing. We must not report this intermediate + * status to the device interrupt handler. + */ + return -EBUSY; + + /* + * We have ending status but no sense information. Do a basic sense. + */ + sense_ccw = &to_io_private(sch)->sense_ccw; + sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE; + sense_ccw->cda = (__u32) __pa(cdev->private->irb.ecw); + sense_ccw->count = SENSE_MAX_COUNT; + sense_ccw->flags = CCW_FLAG_SLI; + + rc = cio_start(sch, sense_ccw, 0xff); + if (rc == -ENODEV || rc == -EACCES) + dev_fsm_event(cdev, DEV_EVENT_VERIFY); + return rc; +} + +/* + * Add information from basic sense to devstat. + */ +void +ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb) +{ + /* + * Check if the status pending bit is set in stctl. + * If not, the remaining bit have no meaning and we must ignore them. + * The esw is not meaningful as well... + */ + if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) + return; + + /* Check for channel checks and interface control checks. */ + ccw_device_msg_control_check(cdev, irb); + + /* Check for path not operational. */ + if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw)) + ccw_device_path_notoper(cdev); + + if (!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && + (irb->scsw.cmd.dstat & DEV_STAT_CHN_END)) { + cdev->private->irb.esw.esw0.erw.cons = 1; + cdev->private->flags.dosense = 0; + } + /* Check if path verification is required. */ + if (ccw_device_accumulate_esw_valid(irb) && + irb->esw.esw0.erw.pvrf) + cdev->private->flags.doverify = 1; +} + +/* + * This function accumulates the status into the private devstat and + * starts a basic sense if one is needed. + */ +int +ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb) +{ + ccw_device_accumulate_irb(cdev, irb); + if ((irb->scsw.cmd.actl & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0) + return -EBUSY; + /* Check for basic sense. */ + if (cdev->private->flags.dosense && + !(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) { + cdev->private->irb.esw.esw0.erw.cons = 1; + cdev->private->flags.dosense = 0; + return 0; + } + if (cdev->private->flags.dosense) { + ccw_device_do_sense(cdev, irb); + return -EBUSY; + } + return 0; +} + diff --git a/drivers/s390/cio/eadm_sch.c b/drivers/s390/cio/eadm_sch.c new file mode 100644 index 000000000..53468ae64 --- /dev/null +++ b/drivers/s390/cio/eadm_sch.c @@ -0,0 +1,411 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for s390 eadm subchannels + * + * Copyright IBM Corp. 2012 + * Author(s): Sebastian Ott + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include "eadm_sch.h" +#include "ioasm.h" +#include "cio.h" +#include "css.h" +#include "orb.h" + +MODULE_DESCRIPTION("driver for s390 eadm subchannels"); +MODULE_LICENSE("GPL"); + +#define EADM_TIMEOUT (7 * HZ) +static DEFINE_SPINLOCK(list_lock); +static LIST_HEAD(eadm_list); + +static debug_info_t *eadm_debug; + +#define EADM_LOG(imp, txt) do { \ + debug_text_event(eadm_debug, imp, txt); \ + } while (0) + +static void EADM_LOG_HEX(int level, void *data, int length) +{ + debug_event(eadm_debug, level, data, length); +} + +static void orb_init(union orb *orb) +{ + memset(orb, 0, sizeof(union orb)); + orb->eadm.compat1 = 1; + orb->eadm.compat2 = 1; + orb->eadm.fmt = 1; + orb->eadm.x = 1; +} + +static int eadm_subchannel_start(struct subchannel *sch, struct aob *aob) +{ + union orb *orb = &get_eadm_private(sch)->orb; + int cc; + + orb_init(orb); + orb->eadm.aob = (u32)__pa(aob); + orb->eadm.intparm = (u32)(addr_t)sch; + orb->eadm.key = PAGE_DEFAULT_KEY >> 4; + + EADM_LOG(6, "start"); + EADM_LOG_HEX(6, &sch->schid, sizeof(sch->schid)); + + cc = ssch(sch->schid, orb); + switch (cc) { + case 0: + sch->schib.scsw.eadm.actl |= SCSW_ACTL_START_PEND; + break; + case 1: /* status pending */ + case 2: /* busy */ + return -EBUSY; + case 3: /* not operational */ + return -ENODEV; + } + return 0; +} + +static int eadm_subchannel_clear(struct subchannel *sch) +{ + int cc; + + cc = csch(sch->schid); + if (cc) + return -ENODEV; + + sch->schib.scsw.eadm.actl |= SCSW_ACTL_CLEAR_PEND; + return 0; +} + +static void eadm_subchannel_timeout(struct timer_list *t) +{ + struct eadm_private *private = from_timer(private, t, timer); + struct subchannel *sch = private->sch; + + spin_lock_irq(sch->lock); + EADM_LOG(1, "timeout"); + EADM_LOG_HEX(1, &sch->schid, sizeof(sch->schid)); + if (eadm_subchannel_clear(sch)) + EADM_LOG(0, "clear failed"); + spin_unlock_irq(sch->lock); +} + +static void eadm_subchannel_set_timeout(struct subchannel *sch, int expires) +{ + struct eadm_private *private = get_eadm_private(sch); + + if (expires == 0) { + del_timer(&private->timer); + return; + } + if (timer_pending(&private->timer)) { + if (mod_timer(&private->timer, jiffies + expires)) + return; + } + private->timer.expires = jiffies + expires; + add_timer(&private->timer); +} + +static void eadm_subchannel_irq(struct subchannel *sch) +{ + struct eadm_private *private = get_eadm_private(sch); + struct eadm_scsw *scsw = &sch->schib.scsw.eadm; + struct irb *irb = this_cpu_ptr(&cio_irb); + blk_status_t error = BLK_STS_OK; + + EADM_LOG(6, "irq"); + EADM_LOG_HEX(6, irb, sizeof(*irb)); + + inc_irq_stat(IRQIO_ADM); + + if ((scsw->stctl & (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) + && scsw->eswf == 1 && irb->esw.eadm.erw.r) + error = BLK_STS_IOERR; + + if (scsw->fctl & SCSW_FCTL_CLEAR_FUNC) + error = BLK_STS_TIMEOUT; + + eadm_subchannel_set_timeout(sch, 0); + + if (private->state != EADM_BUSY) { + EADM_LOG(1, "irq unsol"); + EADM_LOG_HEX(1, irb, sizeof(*irb)); + private->state = EADM_NOT_OPER; + css_sched_sch_todo(sch, SCH_TODO_EVAL); + return; + } + scm_irq_handler((struct aob *)(unsigned long)scsw->aob, error); + private->state = EADM_IDLE; + + if (private->completion) + complete(private->completion); +} + +static struct subchannel *eadm_get_idle_sch(void) +{ + struct eadm_private *private; + struct subchannel *sch; + unsigned long flags; + + spin_lock_irqsave(&list_lock, flags); + list_for_each_entry(private, &eadm_list, head) { + sch = private->sch; + spin_lock(sch->lock); + if (private->state == EADM_IDLE) { + private->state = EADM_BUSY; + list_move_tail(&private->head, &eadm_list); + spin_unlock(sch->lock); + spin_unlock_irqrestore(&list_lock, flags); + + return sch; + } + spin_unlock(sch->lock); + } + spin_unlock_irqrestore(&list_lock, flags); + + return NULL; +} + +int eadm_start_aob(struct aob *aob) +{ + struct eadm_private *private; + struct subchannel *sch; + unsigned long flags; + int ret; + + sch = eadm_get_idle_sch(); + if (!sch) + return -EBUSY; + + spin_lock_irqsave(sch->lock, flags); + eadm_subchannel_set_timeout(sch, EADM_TIMEOUT); + ret = eadm_subchannel_start(sch, aob); + if (!ret) + goto out_unlock; + + /* Handle start subchannel failure. */ + eadm_subchannel_set_timeout(sch, 0); + private = get_eadm_private(sch); + private->state = EADM_NOT_OPER; + css_sched_sch_todo(sch, SCH_TODO_EVAL); + +out_unlock: + spin_unlock_irqrestore(sch->lock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(eadm_start_aob); + +static int eadm_subchannel_probe(struct subchannel *sch) +{ + struct eadm_private *private; + int ret; + + private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); + if (!private) + return -ENOMEM; + + INIT_LIST_HEAD(&private->head); + timer_setup(&private->timer, eadm_subchannel_timeout, 0); + + spin_lock_irq(sch->lock); + set_eadm_private(sch, private); + private->state = EADM_IDLE; + private->sch = sch; + sch->isc = EADM_SCH_ISC; + ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch); + if (ret) { + set_eadm_private(sch, NULL); + spin_unlock_irq(sch->lock); + kfree(private); + goto out; + } + spin_unlock_irq(sch->lock); + + spin_lock_irq(&list_lock); + list_add(&private->head, &eadm_list); + spin_unlock_irq(&list_lock); + + if (dev_get_uevent_suppress(&sch->dev)) { + dev_set_uevent_suppress(&sch->dev, 0); + kobject_uevent(&sch->dev.kobj, KOBJ_ADD); + } +out: + return ret; +} + +static void eadm_quiesce(struct subchannel *sch) +{ + struct eadm_private *private = get_eadm_private(sch); + DECLARE_COMPLETION_ONSTACK(completion); + int ret; + + spin_lock_irq(sch->lock); + if (private->state != EADM_BUSY) + goto disable; + + if (eadm_subchannel_clear(sch)) + goto disable; + + private->completion = &completion; + spin_unlock_irq(sch->lock); + + wait_for_completion_io(&completion); + + spin_lock_irq(sch->lock); + private->completion = NULL; + +disable: + eadm_subchannel_set_timeout(sch, 0); + do { + ret = cio_disable_subchannel(sch); + } while (ret == -EBUSY); + + spin_unlock_irq(sch->lock); +} + +static int eadm_subchannel_remove(struct subchannel *sch) +{ + struct eadm_private *private = get_eadm_private(sch); + + spin_lock_irq(&list_lock); + list_del(&private->head); + spin_unlock_irq(&list_lock); + + eadm_quiesce(sch); + + spin_lock_irq(sch->lock); + set_eadm_private(sch, NULL); + spin_unlock_irq(sch->lock); + + kfree(private); + + return 0; +} + +static void eadm_subchannel_shutdown(struct subchannel *sch) +{ + eadm_quiesce(sch); +} + +static int eadm_subchannel_freeze(struct subchannel *sch) +{ + return cio_disable_subchannel(sch); +} + +static int eadm_subchannel_restore(struct subchannel *sch) +{ + return cio_enable_subchannel(sch, (u32)(unsigned long)sch); +} + +/** + * eadm_subchannel_sch_event - process subchannel event + * @sch: subchannel + * @process: non-zero if function is called in process context + * + * An unspecified event occurred for this subchannel. Adjust data according + * to the current operational state of the subchannel. Return zero when the + * event has been handled sufficiently or -EAGAIN when this function should + * be called again in process context. + */ +static int eadm_subchannel_sch_event(struct subchannel *sch, int process) +{ + struct eadm_private *private; + unsigned long flags; + + spin_lock_irqsave(sch->lock, flags); + if (!device_is_registered(&sch->dev)) + goto out_unlock; + + if (work_pending(&sch->todo_work)) + goto out_unlock; + + if (cio_update_schib(sch)) { + css_sched_sch_todo(sch, SCH_TODO_UNREG); + goto out_unlock; + } + private = get_eadm_private(sch); + if (private->state == EADM_NOT_OPER) + private->state = EADM_IDLE; + +out_unlock: + spin_unlock_irqrestore(sch->lock, flags); + + return 0; +} + +static struct css_device_id eadm_subchannel_ids[] = { + { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_ADM, }, + { /* end of list */ }, +}; +MODULE_DEVICE_TABLE(css, eadm_subchannel_ids); + +static struct css_driver eadm_subchannel_driver = { + .drv = { + .name = "eadm_subchannel", + .owner = THIS_MODULE, + }, + .subchannel_type = eadm_subchannel_ids, + .irq = eadm_subchannel_irq, + .probe = eadm_subchannel_probe, + .remove = eadm_subchannel_remove, + .shutdown = eadm_subchannel_shutdown, + .sch_event = eadm_subchannel_sch_event, + .freeze = eadm_subchannel_freeze, + .thaw = eadm_subchannel_restore, + .restore = eadm_subchannel_restore, +}; + +static int __init eadm_sch_init(void) +{ + int ret; + + if (!css_general_characteristics.eadm) + return -ENXIO; + + eadm_debug = debug_register("eadm_log", 16, 1, 16); + if (!eadm_debug) + return -ENOMEM; + + debug_register_view(eadm_debug, &debug_hex_ascii_view); + debug_set_level(eadm_debug, 2); + + isc_register(EADM_SCH_ISC); + ret = css_driver_register(&eadm_subchannel_driver); + if (ret) + goto cleanup; + + return ret; + +cleanup: + isc_unregister(EADM_SCH_ISC); + debug_unregister(eadm_debug); + return ret; +} + +static void __exit eadm_sch_exit(void) +{ + css_driver_unregister(&eadm_subchannel_driver); + isc_unregister(EADM_SCH_ISC); + debug_unregister(eadm_debug); +} +module_init(eadm_sch_init); +module_exit(eadm_sch_exit); diff --git a/drivers/s390/cio/eadm_sch.h b/drivers/s390/cio/eadm_sch.h new file mode 100644 index 000000000..390ab5a6b --- /dev/null +++ b/drivers/s390/cio/eadm_sch.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef EADM_SCH_H +#define EADM_SCH_H + +#include +#include +#include +#include +#include "orb.h" + +struct eadm_private { + union orb orb; + enum {EADM_IDLE, EADM_BUSY, EADM_NOT_OPER} state; + struct completion *completion; + struct subchannel *sch; + struct timer_list timer; + struct list_head head; +} __aligned(8); + +#define get_eadm_private(n) ((struct eadm_private *)dev_get_drvdata(&n->dev)) +#define set_eadm_private(n, p) (dev_set_drvdata(&n->dev, p)) + +#endif diff --git a/drivers/s390/cio/fcx.c b/drivers/s390/cio/fcx.c new file mode 100644 index 000000000..99c900cc3 --- /dev/null +++ b/drivers/s390/cio/fcx.c @@ -0,0 +1,351 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions for assembling fcx enabled I/O control blocks. + * + * Copyright IBM Corp. 2008 + * Author(s): Peter Oberparleiter + */ + +#include +#include +#include +#include +#include +#include +#include +#include "cio.h" + +/** + * tcw_get_intrg - return pointer to associated interrogate tcw + * @tcw: pointer to the original tcw + * + * Return a pointer to the interrogate tcw associated with the specified tcw + * or %NULL if there is no associated interrogate tcw. + */ +struct tcw *tcw_get_intrg(struct tcw *tcw) +{ + return (struct tcw *) ((addr_t) tcw->intrg); +} +EXPORT_SYMBOL(tcw_get_intrg); + +/** + * tcw_get_data - return pointer to input/output data associated with tcw + * @tcw: pointer to the tcw + * + * Return the input or output data address specified in the tcw depending + * on whether the r-bit or the w-bit is set. If neither bit is set, return + * %NULL. + */ +void *tcw_get_data(struct tcw *tcw) +{ + if (tcw->r) + return (void *) ((addr_t) tcw->input); + if (tcw->w) + return (void *) ((addr_t) tcw->output); + return NULL; +} +EXPORT_SYMBOL(tcw_get_data); + +/** + * tcw_get_tccb - return pointer to tccb associated with tcw + * @tcw: pointer to the tcw + * + * Return pointer to the tccb associated with this tcw. + */ +struct tccb *tcw_get_tccb(struct tcw *tcw) +{ + return (struct tccb *) ((addr_t) tcw->tccb); +} +EXPORT_SYMBOL(tcw_get_tccb); + +/** + * tcw_get_tsb - return pointer to tsb associated with tcw + * @tcw: pointer to the tcw + * + * Return pointer to the tsb associated with this tcw. + */ +struct tsb *tcw_get_tsb(struct tcw *tcw) +{ + return (struct tsb *) ((addr_t) tcw->tsb); +} +EXPORT_SYMBOL(tcw_get_tsb); + +/** + * tcw_init - initialize tcw data structure + * @tcw: pointer to the tcw to be initialized + * @r: initial value of the r-bit + * @w: initial value of the w-bit + * + * Initialize all fields of the specified tcw data structure with zero and + * fill in the format, flags, r and w fields. + */ +void tcw_init(struct tcw *tcw, int r, int w) +{ + memset(tcw, 0, sizeof(struct tcw)); + tcw->format = TCW_FORMAT_DEFAULT; + tcw->flags = TCW_FLAGS_TIDAW_FORMAT(TCW_TIDAW_FORMAT_DEFAULT); + if (r) + tcw->r = 1; + if (w) + tcw->w = 1; +} +EXPORT_SYMBOL(tcw_init); + +static inline size_t tca_size(struct tccb *tccb) +{ + return tccb->tcah.tcal - 12; +} + +static u32 calc_dcw_count(struct tccb *tccb) +{ + int offset; + struct dcw *dcw; + u32 count = 0; + size_t size; + + size = tca_size(tccb); + for (offset = 0; offset < size;) { + dcw = (struct dcw *) &tccb->tca[offset]; + count += dcw->count; + if (!(dcw->flags & DCW_FLAGS_CC)) + break; + offset += sizeof(struct dcw) + ALIGN((int) dcw->cd_count, 4); + } + return count; +} + +static u32 calc_cbc_size(struct tidaw *tidaw, int num) +{ + int i; + u32 cbc_data; + u32 cbc_count = 0; + u64 data_count = 0; + + for (i = 0; i < num; i++) { + if (tidaw[i].flags & TIDAW_FLAGS_LAST) + break; + /* TODO: find out if padding applies to total of data + * transferred or data transferred by this tidaw. Assumption: + * applies to total. */ + data_count += tidaw[i].count; + if (tidaw[i].flags & TIDAW_FLAGS_INSERT_CBC) { + cbc_data = 4 + ALIGN(data_count, 4) - data_count; + cbc_count += cbc_data; + data_count += cbc_data; + } + } + return cbc_count; +} + +/** + * tcw_finalize - finalize tcw length fields and tidaw list + * @tcw: pointer to the tcw + * @num_tidaws: the number of tidaws used to address input/output data or zero + * if no tida is used + * + * Calculate the input-/output-count and tccbl field in the tcw, add a + * tcat the tccb and terminate the data tidaw list if used. + * + * Note: in case input- or output-tida is used, the tidaw-list must be stored + * in contiguous storage (no ttic). The tcal field in the tccb must be + * up-to-date. + */ +void tcw_finalize(struct tcw *tcw, int num_tidaws) +{ + struct tidaw *tidaw; + struct tccb *tccb; + struct tccb_tcat *tcat; + u32 count; + + /* Terminate tidaw list. */ + tidaw = tcw_get_data(tcw); + if (num_tidaws > 0) + tidaw[num_tidaws - 1].flags |= TIDAW_FLAGS_LAST; + /* Add tcat to tccb. */ + tccb = tcw_get_tccb(tcw); + tcat = (struct tccb_tcat *) &tccb->tca[tca_size(tccb)]; + memset(tcat, 0, sizeof(*tcat)); + /* Calculate tcw input/output count and tcat transport count. */ + count = calc_dcw_count(tccb); + if (tcw->w && (tcw->flags & TCW_FLAGS_OUTPUT_TIDA)) + count += calc_cbc_size(tidaw, num_tidaws); + if (tcw->r) + tcw->input_count = count; + else if (tcw->w) + tcw->output_count = count; + tcat->count = ALIGN(count, 4) + 4; + /* Calculate tccbl. */ + tcw->tccbl = (sizeof(struct tccb) + tca_size(tccb) + + sizeof(struct tccb_tcat) - 20) >> 2; +} +EXPORT_SYMBOL(tcw_finalize); + +/** + * tcw_set_intrg - set the interrogate tcw address of a tcw + * @tcw: the tcw address + * @intrg_tcw: the address of the interrogate tcw + * + * Set the address of the interrogate tcw in the specified tcw. + */ +void tcw_set_intrg(struct tcw *tcw, struct tcw *intrg_tcw) +{ + tcw->intrg = (u32) ((addr_t) intrg_tcw); +} +EXPORT_SYMBOL(tcw_set_intrg); + +/** + * tcw_set_data - set data address and tida flag of a tcw + * @tcw: the tcw address + * @data: the data address + * @use_tidal: zero of the data address specifies a contiguous block of data, + * non-zero if it specifies a list if tidaws. + * + * Set the input/output data address of a tcw (depending on the value of the + * r-flag and w-flag). If @use_tidal is non-zero, the corresponding tida flag + * is set as well. + */ +void tcw_set_data(struct tcw *tcw, void *data, int use_tidal) +{ + if (tcw->r) { + tcw->input = (u64) ((addr_t) data); + if (use_tidal) + tcw->flags |= TCW_FLAGS_INPUT_TIDA; + } else if (tcw->w) { + tcw->output = (u64) ((addr_t) data); + if (use_tidal) + tcw->flags |= TCW_FLAGS_OUTPUT_TIDA; + } +} +EXPORT_SYMBOL(tcw_set_data); + +/** + * tcw_set_tccb - set tccb address of a tcw + * @tcw: the tcw address + * @tccb: the tccb address + * + * Set the address of the tccb in the specified tcw. + */ +void tcw_set_tccb(struct tcw *tcw, struct tccb *tccb) +{ + tcw->tccb = (u64) ((addr_t) tccb); +} +EXPORT_SYMBOL(tcw_set_tccb); + +/** + * tcw_set_tsb - set tsb address of a tcw + * @tcw: the tcw address + * @tsb: the tsb address + * + * Set the address of the tsb in the specified tcw. + */ +void tcw_set_tsb(struct tcw *tcw, struct tsb *tsb) +{ + tcw->tsb = (u64) ((addr_t) tsb); +} +EXPORT_SYMBOL(tcw_set_tsb); + +/** + * tccb_init - initialize tccb + * @tccb: the tccb address + * @size: the maximum size of the tccb + * @sac: the service-action-code to be user + * + * Initialize the header of the specified tccb by resetting all values to zero + * and filling in defaults for format, sac and initial tcal fields. + */ +void tccb_init(struct tccb *tccb, size_t size, u32 sac) +{ + memset(tccb, 0, size); + tccb->tcah.format = TCCB_FORMAT_DEFAULT; + tccb->tcah.sac = sac; + tccb->tcah.tcal = 12; +} +EXPORT_SYMBOL(tccb_init); + +/** + * tsb_init - initialize tsb + * @tsb: the tsb address + * + * Initialize the specified tsb by resetting all values to zero. + */ +void tsb_init(struct tsb *tsb) +{ + memset(tsb, 0, sizeof(*tsb)); +} +EXPORT_SYMBOL(tsb_init); + +/** + * tccb_add_dcw - add a dcw to the tccb + * @tccb: the tccb address + * @tccb_size: the maximum tccb size + * @cmd: the dcw command + * @flags: flags for the dcw + * @cd: pointer to control data for this dcw or NULL if none is required + * @cd_count: number of control data bytes for this dcw + * @count: number of data bytes for this dcw + * + * Add a new dcw to the specified tccb by writing the dcw information specified + * by @cmd, @flags, @cd, @cd_count and @count to the tca of the tccb. Return + * a pointer to the newly added dcw on success or -%ENOSPC if the new dcw + * would exceed the available space as defined by @tccb_size. + * + * Note: the tcal field of the tccb header will be updates to reflect added + * content. + */ +struct dcw *tccb_add_dcw(struct tccb *tccb, size_t tccb_size, u8 cmd, u8 flags, + void *cd, u8 cd_count, u32 count) +{ + struct dcw *dcw; + int size; + int tca_offset; + + /* Check for space. */ + tca_offset = tca_size(tccb); + size = ALIGN(sizeof(struct dcw) + cd_count, 4); + if (sizeof(struct tccb_tcah) + tca_offset + size + + sizeof(struct tccb_tcat) > tccb_size) + return ERR_PTR(-ENOSPC); + /* Add dcw to tca. */ + dcw = (struct dcw *) &tccb->tca[tca_offset]; + memset(dcw, 0, size); + dcw->cmd = cmd; + dcw->flags = flags; + dcw->count = count; + dcw->cd_count = cd_count; + if (cd) + memcpy(&dcw->cd[0], cd, cd_count); + tccb->tcah.tcal += size; + return dcw; +} +EXPORT_SYMBOL(tccb_add_dcw); + +/** + * tcw_add_tidaw - add a tidaw to a tcw + * @tcw: the tcw address + * @num_tidaws: the current number of tidaws + * @flags: flags for the new tidaw + * @addr: address value for the new tidaw + * @count: count value for the new tidaw + * + * Add a new tidaw to the input/output data tidaw-list of the specified tcw + * (depending on the value of the r-flag and w-flag) and return a pointer to + * the new tidaw. + * + * Note: the tidaw-list is assumed to be contiguous with no ttics. The caller + * must ensure that there is enough space for the new tidaw. The last-tidaw + * flag for the last tidaw in the list will be set by tcw_finalize. + */ +struct tidaw *tcw_add_tidaw(struct tcw *tcw, int num_tidaws, u8 flags, + void *addr, u32 count) +{ + struct tidaw *tidaw; + + /* Add tidaw to tidaw-list. */ + tidaw = ((struct tidaw *) tcw_get_data(tcw)) + num_tidaws; + memset(tidaw, 0, sizeof(struct tidaw)); + tidaw->flags = flags; + tidaw->count = count; + tidaw->addr = (u64) ((addr_t) addr); + return tidaw; +} +EXPORT_SYMBOL(tcw_add_tidaw); diff --git a/drivers/s390/cio/idset.c b/drivers/s390/cio/idset.c new file mode 100644 index 000000000..835de44db --- /dev/null +++ b/drivers/s390/cio/idset.c @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2007, 2012 + * Author(s): Peter Oberparleiter + */ + +#include +#include +#include +#include "idset.h" +#include "css.h" + +struct idset { + int num_ssid; + int num_id; + unsigned long bitmap[0]; +}; + +static inline unsigned long bitmap_size(int num_ssid, int num_id) +{ + return BITS_TO_LONGS(num_ssid * num_id) * sizeof(unsigned long); +} + +static struct idset *idset_new(int num_ssid, int num_id) +{ + struct idset *set; + + set = vmalloc(sizeof(struct idset) + bitmap_size(num_ssid, num_id)); + if (set) { + set->num_ssid = num_ssid; + set->num_id = num_id; + memset(set->bitmap, 0, bitmap_size(num_ssid, num_id)); + } + return set; +} + +void idset_free(struct idset *set) +{ + vfree(set); +} + +void idset_fill(struct idset *set) +{ + memset(set->bitmap, 0xff, bitmap_size(set->num_ssid, set->num_id)); +} + +static inline void idset_add(struct idset *set, int ssid, int id) +{ + set_bit(ssid * set->num_id + id, set->bitmap); +} + +static inline void idset_del(struct idset *set, int ssid, int id) +{ + clear_bit(ssid * set->num_id + id, set->bitmap); +} + +static inline int idset_contains(struct idset *set, int ssid, int id) +{ + return test_bit(ssid * set->num_id + id, set->bitmap); +} + +static inline int idset_get_first(struct idset *set, int *ssid, int *id) +{ + int bitnum; + + bitnum = find_first_bit(set->bitmap, set->num_ssid * set->num_id); + if (bitnum >= set->num_ssid * set->num_id) + return 0; + *ssid = bitnum / set->num_id; + *id = bitnum % set->num_id; + return 1; +} + +struct idset *idset_sch_new(void) +{ + return idset_new(max_ssid + 1, __MAX_SUBCHANNEL + 1); +} + +void idset_sch_add(struct idset *set, struct subchannel_id schid) +{ + idset_add(set, schid.ssid, schid.sch_no); +} + +void idset_sch_del(struct idset *set, struct subchannel_id schid) +{ + idset_del(set, schid.ssid, schid.sch_no); +} + +/* Clear ids starting from @schid up to end of subchannel set. */ +void idset_sch_del_subseq(struct idset *set, struct subchannel_id schid) +{ + int pos = schid.ssid * set->num_id + schid.sch_no; + + bitmap_clear(set->bitmap, pos, set->num_id - schid.sch_no); +} + +int idset_sch_contains(struct idset *set, struct subchannel_id schid) +{ + return idset_contains(set, schid.ssid, schid.sch_no); +} + +int idset_is_empty(struct idset *set) +{ + return bitmap_empty(set->bitmap, set->num_ssid * set->num_id); +} + +void idset_add_set(struct idset *to, struct idset *from) +{ + int len = min(to->num_ssid * to->num_id, from->num_ssid * from->num_id); + + bitmap_or(to->bitmap, to->bitmap, from->bitmap, len); +} diff --git a/drivers/s390/cio/idset.h b/drivers/s390/cio/idset.h new file mode 100644 index 000000000..a3ece8d80 --- /dev/null +++ b/drivers/s390/cio/idset.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2007, 2012 + * Author(s): Peter Oberparleiter + */ + +#ifndef S390_IDSET_H +#define S390_IDSET_H + +#include + +struct idset; + +void idset_free(struct idset *set); +void idset_fill(struct idset *set); + +struct idset *idset_sch_new(void); +void idset_sch_add(struct idset *set, struct subchannel_id id); +void idset_sch_del(struct idset *set, struct subchannel_id id); +void idset_sch_del_subseq(struct idset *set, struct subchannel_id schid); +int idset_sch_contains(struct idset *set, struct subchannel_id id); +int idset_is_empty(struct idset *set); +void idset_add_set(struct idset *to, struct idset *from); + +#endif /* S390_IDSET_H */ diff --git a/drivers/s390/cio/io_sch.h b/drivers/s390/cio/io_sch.h new file mode 100644 index 000000000..90e4e3a78 --- /dev/null +++ b/drivers/s390/cio/io_sch.h @@ -0,0 +1,175 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef S390_IO_SCH_H +#define S390_IO_SCH_H + +#include +#include +#include +#include +#include "css.h" +#include "orb.h" + +struct io_subchannel_private { + union orb orb; /* operation request block */ + struct ccw1 sense_ccw; /* static ccw for sense command */ + struct ccw_device *cdev;/* pointer to the child ccw device */ + struct { + unsigned int suspend:1; /* allow suspend */ + unsigned int prefetch:1;/* deny prefetch */ + unsigned int inter:1; /* suppress intermediate interrupts */ + } __packed options; +} __aligned(8); + +#define to_io_private(n) ((struct io_subchannel_private *) \ + dev_get_drvdata(&(n)->dev)) +#define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p)) + +static inline struct ccw_device *sch_get_cdev(struct subchannel *sch) +{ + struct io_subchannel_private *priv = to_io_private(sch); + return priv ? priv->cdev : NULL; +} + +static inline void sch_set_cdev(struct subchannel *sch, + struct ccw_device *cdev) +{ + struct io_subchannel_private *priv = to_io_private(sch); + if (priv) + priv->cdev = cdev; +} + +#define MAX_CIWS 8 + +/* + * Possible status values for a CCW request's I/O. + */ +enum io_status { + IO_DONE, + IO_RUNNING, + IO_STATUS_ERROR, + IO_PATH_ERROR, + IO_REJECTED, + IO_KILLED +}; + +/** + * ccw_request - Internal CCW request. + * @cp: channel program to start + * @timeout: maximum allowable time in jiffies between start I/O and interrupt + * @maxretries: number of retries per I/O operation and path + * @lpm: mask of paths to use + * @check: optional callback that determines if results are final + * @filter: optional callback to adjust request status based on IRB data + * @callback: final callback + * @data: user-defined pointer passed to all callbacks + * @singlepath: if set, use only one path from @lpm per start I/O + * @cancel: non-zero if request was cancelled + * @done: non-zero if request was finished + * @mask: current path mask + * @retries: current number of retries + * @drc: delayed return code + */ +struct ccw_request { + struct ccw1 *cp; + unsigned long timeout; + u16 maxretries; + u8 lpm; + int (*check)(struct ccw_device *, void *); + enum io_status (*filter)(struct ccw_device *, void *, struct irb *, + enum io_status); + void (*callback)(struct ccw_device *, void *, int); + void *data; + unsigned int singlepath:1; + /* These fields are used internally. */ + unsigned int cancel:1; + unsigned int done:1; + u16 mask; + u16 retries; + int drc; +} __attribute__((packed)); + +/* + * sense-id response buffer layout + */ +struct senseid { + /* common part */ + u8 reserved; /* always 0x'FF' */ + u16 cu_type; /* control unit type */ + u8 cu_model; /* control unit model */ + u16 dev_type; /* device type */ + u8 dev_model; /* device model */ + u8 unused; /* padding byte */ + /* extended part */ + struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */ +} __attribute__ ((packed, aligned(4))); + +enum cdev_todo { + CDEV_TODO_NOTHING, + CDEV_TODO_ENABLE_CMF, + CDEV_TODO_REBIND, + CDEV_TODO_REGISTER, + CDEV_TODO_UNREG, + CDEV_TODO_UNREG_EVAL, +}; + +#define FAKE_CMD_IRB 1 +#define FAKE_TM_IRB 2 + +struct ccw_device_private { + struct ccw_device *cdev; + struct subchannel *sch; + int state; /* device state */ + atomic_t onoff; + struct ccw_dev_id dev_id; /* device id */ + struct ccw_request req; /* internal I/O request */ + int iretry; + u8 pgid_valid_mask; /* mask of valid PGIDs */ + u8 pgid_todo_mask; /* mask of PGIDs to be adjusted */ + u8 pgid_reset_mask; /* mask of PGIDs which were reset */ + u8 path_noirq_mask; /* mask of paths for which no irq was + received */ + u8 path_notoper_mask; /* mask of paths which were found + not operable */ + u8 path_gone_mask; /* mask of paths, that became unavailable */ + u8 path_new_mask; /* mask of paths, that became available */ + u8 path_broken_mask; /* mask of paths, which were found to be + unusable */ + struct { + unsigned int fast:1; /* post with "channel end" */ + unsigned int repall:1; /* report every interrupt status */ + unsigned int pgroup:1; /* do path grouping */ + unsigned int force:1; /* allow forced online */ + unsigned int mpath:1; /* do multipathing */ + } __attribute__ ((packed)) options; + struct { + unsigned int esid:1; /* Ext. SenseID supported by HW */ + unsigned int dosense:1; /* delayed SENSE required */ + unsigned int doverify:1; /* delayed path verification */ + unsigned int donotify:1; /* call notify function */ + unsigned int recog_done:1; /* dev. recog. complete */ + unsigned int fake_irb:2; /* deliver faked irb */ + unsigned int resuming:1; /* recognition while resume */ + unsigned int pgroup:1; /* pathgroup is set up */ + unsigned int mpath:1; /* multipathing is set up */ + unsigned int pgid_unknown:1;/* unknown pgid state */ + unsigned int initialized:1; /* set if initial reference held */ + } __attribute__((packed)) flags; + unsigned long intparm; /* user interruption parameter */ + struct qdio_irq *qdio_data; + struct irb irb; /* device status */ + int async_kill_io_rc; + struct senseid senseid; /* SenseID info */ + struct pgid pgid[8]; /* path group IDs per chpid*/ + struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */ + struct work_struct todo_work; + enum cdev_todo todo; + wait_queue_head_t wait_q; + struct timer_list timer; + void *cmb; /* measurement information */ + struct list_head cmb_list; /* list of measured devices */ + u64 cmb_start_time; /* clock value of cmb reset */ + void *cmb_wait; /* deferred cmb enable/disable */ + enum interruption_class int_class; +}; + +#endif diff --git a/drivers/s390/cio/ioasm.c b/drivers/s390/cio/ioasm.c new file mode 100644 index 000000000..14d328338 --- /dev/null +++ b/drivers/s390/cio/ioasm.c @@ -0,0 +1,276 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Channel subsystem I/O instructions. + */ + +#include + +#include +#include +#include + +#include "ioasm.h" +#include "orb.h" +#include "cio.h" + +static inline int __stsch(struct subchannel_id schid, struct schib *addr) +{ + register struct subchannel_id reg1 asm ("1") = schid; + int ccode = -EIO; + + asm volatile( + " stsch 0(%3)\n" + "0: ipm %0\n" + " srl %0,28\n" + "1:\n" + EX_TABLE(0b, 1b) + : "+d" (ccode), "=m" (*addr) + : "d" (reg1), "a" (addr) + : "cc"); + return ccode; +} + +int stsch(struct subchannel_id schid, struct schib *addr) +{ + int ccode; + + ccode = __stsch(schid, addr); + trace_s390_cio_stsch(schid, addr, ccode); + + return ccode; +} +EXPORT_SYMBOL(stsch); + +static inline int __msch(struct subchannel_id schid, struct schib *addr) +{ + register struct subchannel_id reg1 asm ("1") = schid; + int ccode = -EIO; + + asm volatile( + " msch 0(%2)\n" + "0: ipm %0\n" + " srl %0,28\n" + "1:\n" + EX_TABLE(0b, 1b) + : "+d" (ccode) + : "d" (reg1), "a" (addr), "m" (*addr) + : "cc"); + return ccode; +} + +int msch(struct subchannel_id schid, struct schib *addr) +{ + int ccode; + + ccode = __msch(schid, addr); + trace_s390_cio_msch(schid, addr, ccode); + + return ccode; +} + +static inline int __tsch(struct subchannel_id schid, struct irb *addr) +{ + register struct subchannel_id reg1 asm ("1") = schid; + int ccode; + + asm volatile( + " tsch 0(%3)\n" + " ipm %0\n" + " srl %0,28" + : "=d" (ccode), "=m" (*addr) + : "d" (reg1), "a" (addr) + : "cc"); + return ccode; +} + +int tsch(struct subchannel_id schid, struct irb *addr) +{ + int ccode; + + ccode = __tsch(schid, addr); + trace_s390_cio_tsch(schid, addr, ccode); + + return ccode; +} + +static inline int __ssch(struct subchannel_id schid, union orb *addr) +{ + register struct subchannel_id reg1 asm("1") = schid; + int ccode = -EIO; + + asm volatile( + " ssch 0(%2)\n" + "0: ipm %0\n" + " srl %0,28\n" + "1:\n" + EX_TABLE(0b, 1b) + : "+d" (ccode) + : "d" (reg1), "a" (addr), "m" (*addr) + : "cc", "memory"); + return ccode; +} + +int ssch(struct subchannel_id schid, union orb *addr) +{ + int ccode; + + ccode = __ssch(schid, addr); + trace_s390_cio_ssch(schid, addr, ccode); + + return ccode; +} +EXPORT_SYMBOL(ssch); + +static inline int __csch(struct subchannel_id schid) +{ + register struct subchannel_id reg1 asm("1") = schid; + int ccode; + + asm volatile( + " csch\n" + " ipm %0\n" + " srl %0,28" + : "=d" (ccode) + : "d" (reg1) + : "cc"); + return ccode; +} + +int csch(struct subchannel_id schid) +{ + int ccode; + + ccode = __csch(schid); + trace_s390_cio_csch(schid, ccode); + + return ccode; +} +EXPORT_SYMBOL(csch); + +int tpi(struct tpi_info *addr) +{ + int ccode; + + asm volatile( + " tpi 0(%2)\n" + " ipm %0\n" + " srl %0,28" + : "=d" (ccode), "=m" (*addr) + : "a" (addr) + : "cc"); + trace_s390_cio_tpi(addr, ccode); + + return ccode; +} + +int chsc(void *chsc_area) +{ + typedef struct { char _[4096]; } addr_type; + int cc = -EIO; + + asm volatile( + " .insn rre,0xb25f0000,%2,0\n" + "0: ipm %0\n" + " srl %0,28\n" + "1:\n" + EX_TABLE(0b, 1b) + : "+d" (cc), "=m" (*(addr_type *) chsc_area) + : "d" (chsc_area), "m" (*(addr_type *) chsc_area) + : "cc"); + trace_s390_cio_chsc(chsc_area, cc); + + return cc; +} +EXPORT_SYMBOL(chsc); + +static inline int __rsch(struct subchannel_id schid) +{ + register struct subchannel_id reg1 asm("1") = schid; + int ccode; + + asm volatile( + " rsch\n" + " ipm %0\n" + " srl %0,28" + : "=d" (ccode) + : "d" (reg1) + : "cc", "memory"); + + return ccode; +} + +int rsch(struct subchannel_id schid) +{ + int ccode; + + ccode = __rsch(schid); + trace_s390_cio_rsch(schid, ccode); + + return ccode; +} + +static inline int __hsch(struct subchannel_id schid) +{ + register struct subchannel_id reg1 asm("1") = schid; + int ccode; + + asm volatile( + " hsch\n" + " ipm %0\n" + " srl %0,28" + : "=d" (ccode) + : "d" (reg1) + : "cc"); + return ccode; +} + +int hsch(struct subchannel_id schid) +{ + int ccode; + + ccode = __hsch(schid); + trace_s390_cio_hsch(schid, ccode); + + return ccode; +} + +static inline int __xsch(struct subchannel_id schid) +{ + register struct subchannel_id reg1 asm("1") = schid; + int ccode; + + asm volatile( + " xsch\n" + " ipm %0\n" + " srl %0,28" + : "=d" (ccode) + : "d" (reg1) + : "cc"); + return ccode; +} + +int xsch(struct subchannel_id schid) +{ + int ccode; + + ccode = __xsch(schid); + trace_s390_cio_xsch(schid, ccode); + + return ccode; +} + +int stcrw(struct crw *crw) +{ + int ccode; + + asm volatile( + " stcrw 0(%2)\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (ccode), "=m" (*crw) + : "a" (crw) + : "cc"); + trace_s390_cio_stcrw(crw, ccode); + + return ccode; +} diff --git a/drivers/s390/cio/ioasm.h b/drivers/s390/cio/ioasm.h new file mode 100644 index 000000000..4be539cb9 --- /dev/null +++ b/drivers/s390/cio/ioasm.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef S390_CIO_IOASM_H +#define S390_CIO_IOASM_H + +#include +#include +#include +#include "orb.h" +#include "cio.h" +#include "trace.h" + +/* + * Some S390 specific IO instructions + */ + +int stsch(struct subchannel_id schid, struct schib *addr); +int msch(struct subchannel_id schid, struct schib *addr); +int tsch(struct subchannel_id schid, struct irb *addr); +int ssch(struct subchannel_id schid, union orb *addr); +int csch(struct subchannel_id schid); +int tpi(struct tpi_info *addr); +int chsc(void *chsc_area); +int rsch(struct subchannel_id schid); +int hsch(struct subchannel_id schid); +int xsch(struct subchannel_id schid); +int stcrw(struct crw *crw); + +#endif diff --git a/drivers/s390/cio/isc.c b/drivers/s390/cio/isc.c new file mode 100644 index 000000000..77fde9f5e --- /dev/null +++ b/drivers/s390/cio/isc.c @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions for registration of I/O interruption subclasses on s390. + * + * Copyright IBM Corp. 2008 + * Authors: Sebastian Ott + */ + +#include +#include +#include + +static unsigned int isc_refs[MAX_ISC + 1]; +static DEFINE_SPINLOCK(isc_ref_lock); + + +/** + * isc_register - register an I/O interruption subclass. + * @isc: I/O interruption subclass to register + * + * The number of users for @isc is increased. If this is the first user to + * register @isc, the corresponding I/O interruption subclass mask is enabled. + * + * Context: + * This function must not be called in interrupt context. + */ +void isc_register(unsigned int isc) +{ + if (isc > MAX_ISC) { + WARN_ON(1); + return; + } + + spin_lock(&isc_ref_lock); + if (isc_refs[isc] == 0) + ctl_set_bit(6, 31 - isc); + isc_refs[isc]++; + spin_unlock(&isc_ref_lock); +} +EXPORT_SYMBOL_GPL(isc_register); + +/** + * isc_unregister - unregister an I/O interruption subclass. + * @isc: I/O interruption subclass to unregister + * + * The number of users for @isc is decreased. If this is the last user to + * unregister @isc, the corresponding I/O interruption subclass mask is + * disabled. + * Note: This function must not be called if isc_register() hasn't been called + * before by the driver for @isc. + * + * Context: + * This function must not be called in interrupt context. + */ +void isc_unregister(unsigned int isc) +{ + spin_lock(&isc_ref_lock); + /* check for misuse */ + if (isc > MAX_ISC || isc_refs[isc] == 0) { + WARN_ON(1); + goto out_unlock; + } + if (isc_refs[isc] == 1) + ctl_clear_bit(6, 31 - isc); + isc_refs[isc]--; +out_unlock: + spin_unlock(&isc_ref_lock); +} +EXPORT_SYMBOL_GPL(isc_unregister); diff --git a/drivers/s390/cio/itcw.c b/drivers/s390/cio/itcw.c new file mode 100644 index 000000000..19e463633 --- /dev/null +++ b/drivers/s390/cio/itcw.c @@ -0,0 +1,370 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions for incremental construction of fcx enabled I/O control blocks. + * + * Copyright IBM Corp. 2008 + * Author(s): Peter Oberparleiter + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * struct itcw - incremental tcw helper data type + * + * This structure serves as a handle for the incremental construction of a + * tcw and associated tccb, tsb, data tidaw-list plus an optional interrogate + * tcw and associated data. The data structures are contained inside a single + * contiguous buffer provided by the user. + * + * The itcw construction functions take care of overall data integrity: + * - reset unused fields to zero + * - fill in required pointers + * - ensure required alignment for data structures + * - prevent data structures to cross 4k-byte boundary where required + * - calculate tccb-related length fields + * - optionally provide ready-made interrogate tcw and associated structures + * + * Restrictions apply to the itcws created with these construction functions: + * - tida only supported for data address, not for tccb + * - only contiguous tidaw-lists (no ttic) + * - total number of bytes required per itcw may not exceed 4k bytes + * - either read or write operation (may not work with r=0 and w=0) + * + * Example: + * struct itcw *itcw; + * void *buffer; + * size_t size; + * + * size = itcw_calc_size(1, 2, 0); + * buffer = kmalloc(size, GFP_KERNEL | GFP_DMA); + * if (!buffer) + * return -ENOMEM; + * itcw = itcw_init(buffer, size, ITCW_OP_READ, 1, 2, 0); + * if (IS_ERR(itcw)) + * return PTR_ER(itcw); + * itcw_add_dcw(itcw, 0x2, 0, NULL, 0, 72); + * itcw_add_tidaw(itcw, 0, 0x30000, 20); + * itcw_add_tidaw(itcw, 0, 0x40000, 52); + * itcw_finalize(itcw); + * + */ +struct itcw { + struct tcw *tcw; + struct tcw *intrg_tcw; + int num_tidaws; + int max_tidaws; + int intrg_num_tidaws; + int intrg_max_tidaws; +}; + +/** + * itcw_get_tcw - return pointer to tcw associated with the itcw + * @itcw: address of the itcw + * + * Return pointer to the tcw associated with the itcw. + */ +struct tcw *itcw_get_tcw(struct itcw *itcw) +{ + return itcw->tcw; +} +EXPORT_SYMBOL(itcw_get_tcw); + +/** + * itcw_calc_size - return the size of an itcw with the given parameters + * @intrg: if non-zero, add an interrogate tcw + * @max_tidaws: maximum number of tidaws to be used for data addressing or zero + * if no tida is to be used. + * @intrg_max_tidaws: maximum number of tidaws to be used for data addressing + * by the interrogate tcw, if specified + * + * Calculate and return the number of bytes required to hold an itcw with the + * given parameters and assuming tccbs with maximum size. + * + * Note that the resulting size also contains bytes needed for alignment + * padding as well as padding to ensure that data structures don't cross a + * 4k-boundary where required. + */ +size_t itcw_calc_size(int intrg, int max_tidaws, int intrg_max_tidaws) +{ + size_t len; + int cross_count; + + /* Main data. */ + len = sizeof(struct itcw); + len += /* TCW */ sizeof(struct tcw) + /* TCCB */ TCCB_MAX_SIZE + + /* TSB */ sizeof(struct tsb) + + /* TIDAL */ max_tidaws * sizeof(struct tidaw); + /* Interrogate data. */ + if (intrg) { + len += /* TCW */ sizeof(struct tcw) + /* TCCB */ TCCB_MAX_SIZE + + /* TSB */ sizeof(struct tsb) + + /* TIDAL */ intrg_max_tidaws * sizeof(struct tidaw); + } + + /* Maximum required alignment padding. */ + len += /* Initial TCW */ 63 + /* Interrogate TCCB */ 7; + + /* TIDAW lists may not cross a 4k boundary. To cross a + * boundary we need to add a TTIC TIDAW. We need to reserve + * one additional TIDAW for a TTIC that we may need to add due + * to the placement of the data chunk in memory, and a further + * TIDAW for each page boundary that the TIDAW list may cross + * due to it's own size. + */ + if (max_tidaws) { + cross_count = 1 + ((max_tidaws * sizeof(struct tidaw) - 1) + >> PAGE_SHIFT); + len += cross_count * sizeof(struct tidaw); + } + if (intrg_max_tidaws) { + cross_count = 1 + ((intrg_max_tidaws * sizeof(struct tidaw) - 1) + >> PAGE_SHIFT); + len += cross_count * sizeof(struct tidaw); + } + return len; +} +EXPORT_SYMBOL(itcw_calc_size); + +#define CROSS4K(x, l) (((x) & ~4095) != ((x + l) & ~4095)) + +static inline void *fit_chunk(addr_t *start, addr_t end, size_t len, + int align, int check_4k) +{ + addr_t addr; + + addr = ALIGN(*start, align); + if (check_4k && CROSS4K(addr, len)) { + addr = ALIGN(addr, 4096); + addr = ALIGN(addr, align); + } + if (addr + len > end) + return ERR_PTR(-ENOSPC); + *start = addr + len; + return (void *) addr; +} + +/** + * itcw_init - initialize incremental tcw data structure + * @buffer: address of buffer to use for data structures + * @size: number of bytes in buffer + * @op: %ITCW_OP_READ for a read operation tcw, %ITCW_OP_WRITE for a write + * operation tcw + * @intrg: if non-zero, add and initialize an interrogate tcw + * @max_tidaws: maximum number of tidaws to be used for data addressing or zero + * if no tida is to be used. + * @intrg_max_tidaws: maximum number of tidaws to be used for data addressing + * by the interrogate tcw, if specified + * + * Prepare the specified buffer to be used as an incremental tcw, i.e. a + * helper data structure that can be used to construct a valid tcw by + * successive calls to other helper functions. Note: the buffer needs to be + * located below the 2G address limit. The resulting tcw has the following + * restrictions: + * - no tccb tidal + * - input/output tidal is contiguous (no ttic) + * - total data should not exceed 4k + * - tcw specifies either read or write operation + * + * On success, return pointer to the resulting incremental tcw data structure, + * ERR_PTR otherwise. + */ +struct itcw *itcw_init(void *buffer, size_t size, int op, int intrg, + int max_tidaws, int intrg_max_tidaws) +{ + struct itcw *itcw; + void *chunk; + addr_t start; + addr_t end; + int cross_count; + + /* Check for 2G limit. */ + start = (addr_t) buffer; + end = start + size; + if (end > (1 << 31)) + return ERR_PTR(-EINVAL); + memset(buffer, 0, size); + /* ITCW. */ + chunk = fit_chunk(&start, end, sizeof(struct itcw), 1, 0); + if (IS_ERR(chunk)) + return chunk; + itcw = chunk; + /* allow for TTIC tidaws that may be needed to cross a page boundary */ + cross_count = 0; + if (max_tidaws) + cross_count = 1 + ((max_tidaws * sizeof(struct tidaw) - 1) + >> PAGE_SHIFT); + itcw->max_tidaws = max_tidaws + cross_count; + cross_count = 0; + if (intrg_max_tidaws) + cross_count = 1 + ((intrg_max_tidaws * sizeof(struct tidaw) - 1) + >> PAGE_SHIFT); + itcw->intrg_max_tidaws = intrg_max_tidaws + cross_count; + /* Main TCW. */ + chunk = fit_chunk(&start, end, sizeof(struct tcw), 64, 0); + if (IS_ERR(chunk)) + return chunk; + itcw->tcw = chunk; + tcw_init(itcw->tcw, (op == ITCW_OP_READ) ? 1 : 0, + (op == ITCW_OP_WRITE) ? 1 : 0); + /* Interrogate TCW. */ + if (intrg) { + chunk = fit_chunk(&start, end, sizeof(struct tcw), 64, 0); + if (IS_ERR(chunk)) + return chunk; + itcw->intrg_tcw = chunk; + tcw_init(itcw->intrg_tcw, 1, 0); + tcw_set_intrg(itcw->tcw, itcw->intrg_tcw); + } + /* Data TIDAL. */ + if (max_tidaws > 0) { + chunk = fit_chunk(&start, end, sizeof(struct tidaw) * + itcw->max_tidaws, 16, 0); + if (IS_ERR(chunk)) + return chunk; + tcw_set_data(itcw->tcw, chunk, 1); + } + /* Interrogate data TIDAL. */ + if (intrg && (intrg_max_tidaws > 0)) { + chunk = fit_chunk(&start, end, sizeof(struct tidaw) * + itcw->intrg_max_tidaws, 16, 0); + if (IS_ERR(chunk)) + return chunk; + tcw_set_data(itcw->intrg_tcw, chunk, 1); + } + /* TSB. */ + chunk = fit_chunk(&start, end, sizeof(struct tsb), 8, 0); + if (IS_ERR(chunk)) + return chunk; + tsb_init(chunk); + tcw_set_tsb(itcw->tcw, chunk); + /* Interrogate TSB. */ + if (intrg) { + chunk = fit_chunk(&start, end, sizeof(struct tsb), 8, 0); + if (IS_ERR(chunk)) + return chunk; + tsb_init(chunk); + tcw_set_tsb(itcw->intrg_tcw, chunk); + } + /* TCCB. */ + chunk = fit_chunk(&start, end, TCCB_MAX_SIZE, 8, 0); + if (IS_ERR(chunk)) + return chunk; + tccb_init(chunk, TCCB_MAX_SIZE, TCCB_SAC_DEFAULT); + tcw_set_tccb(itcw->tcw, chunk); + /* Interrogate TCCB. */ + if (intrg) { + chunk = fit_chunk(&start, end, TCCB_MAX_SIZE, 8, 0); + if (IS_ERR(chunk)) + return chunk; + tccb_init(chunk, TCCB_MAX_SIZE, TCCB_SAC_INTRG); + tcw_set_tccb(itcw->intrg_tcw, chunk); + tccb_add_dcw(chunk, TCCB_MAX_SIZE, DCW_CMD_INTRG, 0, NULL, + sizeof(struct dcw_intrg_data), 0); + tcw_finalize(itcw->intrg_tcw, 0); + } + return itcw; +} +EXPORT_SYMBOL(itcw_init); + +/** + * itcw_add_dcw - add a dcw to the itcw + * @itcw: address of the itcw + * @cmd: the dcw command + * @flags: flags for the dcw + * @cd: address of control data for this dcw or NULL if none is required + * @cd_count: number of control data bytes for this dcw + * @count: number of data bytes for this dcw + * + * Add a new dcw to the specified itcw by writing the dcw information specified + * by @cmd, @flags, @cd, @cd_count and @count to the tca of the tccb. Return + * a pointer to the newly added dcw on success or -%ENOSPC if the new dcw + * would exceed the available space. + * + * Note: the tcal field of the tccb header will be updated to reflect added + * content. + */ +struct dcw *itcw_add_dcw(struct itcw *itcw, u8 cmd, u8 flags, void *cd, + u8 cd_count, u32 count) +{ + return tccb_add_dcw(tcw_get_tccb(itcw->tcw), TCCB_MAX_SIZE, cmd, + flags, cd, cd_count, count); +} +EXPORT_SYMBOL(itcw_add_dcw); + +/** + * itcw_add_tidaw - add a tidaw to the itcw + * @itcw: address of the itcw + * @flags: flags for the new tidaw + * @addr: address value for the new tidaw + * @count: count value for the new tidaw + * + * Add a new tidaw to the input/output data tidaw-list of the specified itcw + * (depending on the value of the r-flag and w-flag). Return a pointer to + * the new tidaw on success or -%ENOSPC if the new tidaw would exceed the + * available space. + * + * Note: TTIC tidaws are automatically added when needed, so explicitly calling + * this interface with the TTIC flag is not supported. The last-tidaw flag + * for the last tidaw in the list will be set by itcw_finalize. + */ +struct tidaw *itcw_add_tidaw(struct itcw *itcw, u8 flags, void *addr, u32 count) +{ + struct tidaw *following; + + if (itcw->num_tidaws >= itcw->max_tidaws) + return ERR_PTR(-ENOSPC); + /* + * Is the tidaw, which follows the one we are about to fill, on the next + * page? Then we have to insert a TTIC tidaw first, that points to the + * tidaw on the new page. + */ + following = ((struct tidaw *) tcw_get_data(itcw->tcw)) + + itcw->num_tidaws + 1; + if (itcw->num_tidaws && !((unsigned long) following & ~PAGE_MASK)) { + tcw_add_tidaw(itcw->tcw, itcw->num_tidaws++, + TIDAW_FLAGS_TTIC, following, 0); + if (itcw->num_tidaws >= itcw->max_tidaws) + return ERR_PTR(-ENOSPC); + } + return tcw_add_tidaw(itcw->tcw, itcw->num_tidaws++, flags, addr, count); +} +EXPORT_SYMBOL(itcw_add_tidaw); + +/** + * itcw_set_data - set data address and tida flag of the itcw + * @itcw: address of the itcw + * @addr: the data address + * @use_tidal: zero of the data address specifies a contiguous block of data, + * non-zero if it specifies a list if tidaws. + * + * Set the input/output data address of the itcw (depending on the value of the + * r-flag and w-flag). If @use_tidal is non-zero, the corresponding tida flag + * is set as well. + */ +void itcw_set_data(struct itcw *itcw, void *addr, int use_tidal) +{ + tcw_set_data(itcw->tcw, addr, use_tidal); +} +EXPORT_SYMBOL(itcw_set_data); + +/** + * itcw_finalize - calculate length and count fields of the itcw + * @itcw: address of the itcw + * + * Calculate tcw input-/output-count and tccbl fields and add a tcat the tccb. + * In case input- or output-tida is used, the tidaw-list must be stored in + * continuous storage (no ttic). The tcal field in the tccb must be + * up-to-date. + */ +void itcw_finalize(struct itcw *itcw) +{ + tcw_finalize(itcw->tcw, itcw->num_tidaws); +} +EXPORT_SYMBOL(itcw_finalize); diff --git a/drivers/s390/cio/orb.h b/drivers/s390/cio/orb.h new file mode 100644 index 000000000..a2d3778b2 --- /dev/null +++ b/drivers/s390/cio/orb.h @@ -0,0 +1,92 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Orb related data structures. + * + * Copyright IBM Corp. 2007, 2011 + * + * Author(s): Cornelia Huck + * Peter Oberparleiter + * Sebastian Ott + */ + +#ifndef S390_ORB_H +#define S390_ORB_H + +/* + * Command-mode operation request block + */ +struct cmd_orb { + u32 intparm; /* interruption parameter */ + u32 key:4; /* flags, like key, suspend control, etc. */ + u32 spnd:1; /* suspend control */ + u32 res1:1; /* reserved */ + u32 mod:1; /* modification control */ + u32 sync:1; /* synchronize control */ + u32 fmt:1; /* format control */ + u32 pfch:1; /* prefetch control */ + u32 isic:1; /* initial-status-interruption control */ + u32 alcc:1; /* address-limit-checking control */ + u32 ssic:1; /* suppress-suspended-interr. control */ + u32 res2:1; /* reserved */ + u32 c64:1; /* IDAW/QDIO 64 bit control */ + u32 i2k:1; /* IDAW 2/4kB block size control */ + u32 lpm:8; /* logical path mask */ + u32 ils:1; /* incorrect length */ + u32 zero:6; /* reserved zeros */ + u32 orbx:1; /* ORB extension control */ + u32 cpa; /* channel program address */ +} __packed __aligned(4); + +/* + * Transport-mode operation request block + */ +struct tm_orb { + u32 intparm; + u32 key:4; + u32:9; + u32 b:1; + u32:2; + u32 lpm:8; + u32:7; + u32 x:1; + u32 tcw; + u32 prio:8; + u32:8; + u32 rsvpgm:8; + u32:8; + u32:32; + u32:32; + u32:32; + u32:32; +} __packed __aligned(4); + +/* + * eadm operation request block + */ +struct eadm_orb { + u32 intparm; + u32 key:4; + u32:4; + u32 compat1:1; + u32 compat2:1; + u32:21; + u32 x:1; + u32 aob; + u32 css_prio:8; + u32:8; + u32 scm_prio:8; + u32:8; + u32:29; + u32 fmt:3; + u32:32; + u32:32; + u32:32; +} __packed __aligned(4); + +union orb { + struct cmd_orb cmd; + struct tm_orb tm; + struct eadm_orb eadm; +} __packed __aligned(4); + +#endif /* S390_ORB_H */ diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h new file mode 100644 index 000000000..ed60b8d4e --- /dev/null +++ b/drivers/s390/cio/qdio.h @@ -0,0 +1,418 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2000, 2009 + * Author(s): Utz Bacher + * Jan Glauber + */ +#ifndef _CIO_QDIO_H +#define _CIO_QDIO_H + +#include +#include +#include +#include "chsc.h" + +#define QDIO_BUSY_BIT_PATIENCE (100 << 12) /* 100 microseconds */ +#define QDIO_BUSY_BIT_RETRY_DELAY 10 /* 10 milliseconds */ +#define QDIO_BUSY_BIT_RETRIES 1000 /* = 10s retry time */ +#define QDIO_INPUT_THRESHOLD (500 << 12) /* 500 microseconds */ + +enum qdio_irq_states { + QDIO_IRQ_STATE_INACTIVE, + QDIO_IRQ_STATE_ESTABLISHED, + QDIO_IRQ_STATE_ACTIVE, + QDIO_IRQ_STATE_STOPPED, + QDIO_IRQ_STATE_CLEANUP, + QDIO_IRQ_STATE_ERR, + NR_QDIO_IRQ_STATES, +}; + +/* used as intparm in do_IO */ +#define QDIO_DOING_ESTABLISH 1 +#define QDIO_DOING_ACTIVATE 2 +#define QDIO_DOING_CLEANUP 3 + +#define SLSB_STATE_NOT_INIT 0x0 +#define SLSB_STATE_EMPTY 0x1 +#define SLSB_STATE_PRIMED 0x2 +#define SLSB_STATE_PENDING 0x3 +#define SLSB_STATE_HALTED 0xe +#define SLSB_STATE_ERROR 0xf +#define SLSB_TYPE_INPUT 0x0 +#define SLSB_TYPE_OUTPUT 0x20 +#define SLSB_OWNER_PROG 0x80 +#define SLSB_OWNER_CU 0x40 + +#define SLSB_P_INPUT_NOT_INIT \ + (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_NOT_INIT) /* 0x80 */ +#define SLSB_P_INPUT_ACK \ + (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY) /* 0x81 */ +#define SLSB_CU_INPUT_EMPTY \ + (SLSB_OWNER_CU | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY) /* 0x41 */ +#define SLSB_P_INPUT_PRIMED \ + (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_PRIMED) /* 0x82 */ +#define SLSB_P_INPUT_HALTED \ + (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_HALTED) /* 0x8e */ +#define SLSB_P_INPUT_ERROR \ + (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_ERROR) /* 0x8f */ +#define SLSB_P_OUTPUT_NOT_INIT \ + (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_NOT_INIT) /* 0xa0 */ +#define SLSB_P_OUTPUT_EMPTY \ + (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_EMPTY) /* 0xa1 */ +#define SLSB_P_OUTPUT_PENDING \ + (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_PENDING) /* 0xa3 */ +#define SLSB_CU_OUTPUT_PRIMED \ + (SLSB_OWNER_CU | SLSB_TYPE_OUTPUT | SLSB_STATE_PRIMED) /* 0x62 */ +#define SLSB_P_OUTPUT_HALTED \ + (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_HALTED) /* 0xae */ +#define SLSB_P_OUTPUT_ERROR \ + (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_ERROR) /* 0xaf */ + +#define SLSB_ERROR_DURING_LOOKUP 0xff + +/* additional CIWs returned by extended Sense-ID */ +#define CIW_TYPE_EQUEUE 0x3 /* establish QDIO queues */ +#define CIW_TYPE_AQUEUE 0x4 /* activate QDIO queues */ + +/* flags for st qdio sch data */ +#define CHSC_FLAG_QDIO_CAPABILITY 0x80 +#define CHSC_FLAG_VALIDITY 0x40 + +/* SIGA flags */ +#define QDIO_SIGA_WRITE 0x00 +#define QDIO_SIGA_READ 0x01 +#define QDIO_SIGA_SYNC 0x02 +#define QDIO_SIGA_WRITEQ 0x04 +#define QDIO_SIGA_QEBSM_FLAG 0x80 + +static inline int do_sqbs(u64 token, unsigned char state, int queue, + int *start, int *count) +{ + register unsigned long _ccq asm ("0") = *count; + register unsigned long _token asm ("1") = token; + unsigned long _queuestart = ((unsigned long)queue << 32) | *start; + + asm volatile( + " .insn rsy,0xeb000000008A,%1,0,0(%2)" + : "+d" (_ccq), "+d" (_queuestart) + : "d" ((unsigned long)state), "d" (_token) + : "memory", "cc"); + *count = _ccq & 0xff; + *start = _queuestart & 0xff; + + return (_ccq >> 32) & 0xff; +} + +static inline int do_eqbs(u64 token, unsigned char *state, int queue, + int *start, int *count, int ack) +{ + register unsigned long _ccq asm ("0") = *count; + register unsigned long _token asm ("1") = token; + unsigned long _queuestart = ((unsigned long)queue << 32) | *start; + unsigned long _state = (unsigned long)ack << 63; + + asm volatile( + " .insn rrf,0xB99c0000,%1,%2,0,0" + : "+d" (_ccq), "+d" (_queuestart), "+d" (_state) + : "d" (_token) + : "memory", "cc"); + *count = _ccq & 0xff; + *start = _queuestart & 0xff; + *state = _state & 0xff; + + return (_ccq >> 32) & 0xff; +} + +struct qdio_irq; + +struct siga_flag { + u8 input:1; + u8 output:1; + u8 sync:1; + u8 sync_after_ai:1; + u8 sync_out_after_pci:1; + u8:3; +} __attribute__ ((packed)); + +struct qdio_dev_perf_stat { + unsigned int adapter_int; + unsigned int qdio_int; + unsigned int pci_request_int; + + unsigned int tasklet_inbound; + unsigned int tasklet_inbound_resched; + unsigned int tasklet_inbound_resched2; + unsigned int tasklet_outbound; + + unsigned int siga_read; + unsigned int siga_write; + unsigned int siga_sync; + + unsigned int inbound_call; + unsigned int inbound_handler; + unsigned int stop_polling; + unsigned int inbound_queue_full; + unsigned int outbound_call; + unsigned int outbound_handler; + unsigned int outbound_queue_full; + unsigned int fast_requeue; + unsigned int target_full; + unsigned int eqbs; + unsigned int eqbs_partial; + unsigned int sqbs; + unsigned int sqbs_partial; + unsigned int int_discarded; +} ____cacheline_aligned; + +struct qdio_queue_perf_stat { + /* + * Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128. + * Since max. 127 SBALs are scanned reuse entry for 128 as queue full + * aka 127 SBALs found. + */ + unsigned int nr_sbals[8]; + unsigned int nr_sbal_error; + unsigned int nr_sbal_nop; + unsigned int nr_sbal_total; +}; + +enum qdio_queue_irq_states { + QDIO_QUEUE_IRQS_DISABLED, +}; + +struct qdio_input_q { + /* input buffer acknowledgement flag */ + int polling; + /* first ACK'ed buffer */ + int ack_start; + /* how much sbals are acknowledged with qebsm */ + int ack_count; + /* last time of noticing incoming data */ + u64 timestamp; + /* upper-layer polling flag */ + unsigned long queue_irq_state; + /* callback to start upper-layer polling */ + void (*queue_start_poll) (struct ccw_device *, int, unsigned long); +}; + +struct qdio_output_q { + /* PCIs are enabled for the queue */ + int pci_out_enabled; + /* cq: use asynchronous output buffers */ + int use_cq; + /* cq: aobs used for particual SBAL */ + struct qaob **aobs; + /* cq: sbal state related to asynchronous operation */ + struct qdio_outbuf_state *sbal_state; + /* timer to check for more outbound work */ + struct timer_list timer; + /* used SBALs before tasklet schedule */ + int scan_threshold; +}; + +/* + * Note on cache alignment: grouped slsb and write mostly data at the beginning + * sbal[] is read-only and starts on a new cacheline followed by read mostly. + */ +struct qdio_q { + struct slsb slsb; + + union { + struct qdio_input_q in; + struct qdio_output_q out; + } u; + + /* + * inbound: next buffer the program should check for + * outbound: next buffer to check if adapter processed it + */ + int first_to_check; + + /* first_to_check of the last time */ + int last_move; + + /* beginning position for calling the program */ + int first_to_kick; + + /* number of buffers in use by the adapter */ + atomic_t nr_buf_used; + + /* error condition during a data transfer */ + unsigned int qdio_error; + + /* last scan of the queue */ + u64 timestamp; + + struct tasklet_struct tasklet; + struct qdio_queue_perf_stat q_stats; + + struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned; + + /* queue number */ + int nr; + + /* bitmask of queue number */ + int mask; + + /* input or output queue */ + int is_input_q; + + /* list of thinint input queues */ + struct list_head entry; + + /* upper-layer program handler */ + qdio_handler_t (*handler); + + struct dentry *debugfs_q; + struct qdio_irq *irq_ptr; + struct sl *sl; + /* + * A page is allocated under this pointer and used for slib and sl. + * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2. + */ + struct slib *slib; +} __attribute__ ((aligned(256))); + +struct qdio_irq { + struct qib qib; + u32 *dsci; /* address of device state change indicator */ + struct ccw_device *cdev; + struct dentry *debugfs_dev; + struct dentry *debugfs_perf; + + unsigned long int_parm; + struct subchannel_id schid; + unsigned long sch_token; /* QEBSM facility */ + + enum qdio_irq_states state; + + struct siga_flag siga_flag; /* siga sync information from qdioac */ + + int nr_input_qs; + int nr_output_qs; + + struct ccw1 ccw; + struct ciw equeue; + struct ciw aqueue; + + struct qdio_ssqd_desc ssqd_desc; + void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *); + + int perf_stat_enabled; + + struct qdr *qdr; + unsigned long chsc_page; + + struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ]; + struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ]; + + debug_info_t *debug_area; + struct mutex setup_mutex; + struct qdio_dev_perf_stat perf_stat; +}; + +/* helper functions */ +#define queue_type(q) q->irq_ptr->qib.qfmt +#define SCH_NO(q) (q->irq_ptr->schid.sch_no) + +#define is_thinint_irq(irq) \ + (irq->qib.qfmt == QDIO_IQDIO_QFMT || \ + css_general_characteristics.aif_osa) + +#define qperf(__qdev, __attr) ((__qdev)->perf_stat.(__attr)) + +#define qperf_inc(__q, __attr) \ +({ \ + struct qdio_irq *qdev = (__q)->irq_ptr; \ + if (qdev->perf_stat_enabled) \ + (qdev->perf_stat.__attr)++; \ +}) + +static inline void account_sbals_error(struct qdio_q *q, int count) +{ + q->q_stats.nr_sbal_error += count; + q->q_stats.nr_sbal_total += count; +} + +/* the highest iqdio queue is used for multicast */ +static inline int multicast_outbound(struct qdio_q *q) +{ + return (q->irq_ptr->nr_output_qs > 1) && + (q->nr == q->irq_ptr->nr_output_qs - 1); +} + +#define pci_out_supported(q) \ + (q->irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) +#define is_qebsm(q) (q->irq_ptr->sch_token != 0) + +#define need_siga_in(q) (q->irq_ptr->siga_flag.input) +#define need_siga_out(q) (q->irq_ptr->siga_flag.output) +#define need_siga_sync(q) (unlikely(q->irq_ptr->siga_flag.sync)) +#define need_siga_sync_after_ai(q) \ + (unlikely(q->irq_ptr->siga_flag.sync_after_ai)) +#define need_siga_sync_out_after_pci(q) \ + (unlikely(q->irq_ptr->siga_flag.sync_out_after_pci)) + +#define for_each_input_queue(irq_ptr, q, i) \ + for (i = 0; i < irq_ptr->nr_input_qs && \ + ({ q = irq_ptr->input_qs[i]; 1; }); i++) +#define for_each_output_queue(irq_ptr, q, i) \ + for (i = 0; i < irq_ptr->nr_output_qs && \ + ({ q = irq_ptr->output_qs[i]; 1; }); i++) + +#define prev_buf(bufnr) \ + ((bufnr + QDIO_MAX_BUFFERS_MASK) & QDIO_MAX_BUFFERS_MASK) +#define next_buf(bufnr) \ + ((bufnr + 1) & QDIO_MAX_BUFFERS_MASK) +#define add_buf(bufnr, inc) \ + ((bufnr + inc) & QDIO_MAX_BUFFERS_MASK) +#define sub_buf(bufnr, dec) \ + ((bufnr - dec) & QDIO_MAX_BUFFERS_MASK) + +#define queue_irqs_enabled(q) \ + (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) == 0) +#define queue_irqs_disabled(q) \ + (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) != 0) + +extern u64 last_ai_time; + +/* prototypes for thin interrupt */ +int qdio_establish_thinint(struct qdio_irq *irq_ptr); +void qdio_shutdown_thinint(struct qdio_irq *irq_ptr); +void tiqdio_add_input_queues(struct qdio_irq *irq_ptr); +void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr); +void tiqdio_inbound_processing(unsigned long q); +int tiqdio_allocate_memory(void); +void tiqdio_free_memory(void); +int tiqdio_register_thinints(void); +void tiqdio_unregister_thinints(void); +void clear_nonshared_ind(struct qdio_irq *); +int test_nonshared_ind(struct qdio_irq *); + +/* prototypes for setup */ +void qdio_inbound_processing(unsigned long data); +void qdio_outbound_processing(unsigned long data); +void qdio_outbound_timer(struct timer_list *t); +void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, + struct irb *irb); +int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, + int nr_output_qs); +void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr); +int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr, + struct subchannel_id *schid, + struct qdio_ssqd_desc *data); +int qdio_setup_irq(struct qdio_initialize *init_data); +void qdio_print_subchannel_info(struct qdio_irq *irq_ptr, + struct ccw_device *cdev); +void qdio_release_memory(struct qdio_irq *irq_ptr); +int qdio_setup_create_sysfs(struct ccw_device *cdev); +void qdio_setup_destroy_sysfs(struct ccw_device *cdev); +int qdio_setup_init(void); +void qdio_setup_exit(void); +int qdio_enable_async_operation(struct qdio_output_q *q); +void qdio_disable_async_operation(struct qdio_output_q *q); +struct qaob *qdio_allocate_aob(void); + +int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, + unsigned char *state); +#endif /* _CIO_QDIO_H */ diff --git a/drivers/s390/cio/qdio_debug.c b/drivers/s390/cio/qdio_debug.c new file mode 100644 index 000000000..68a82f3e2 --- /dev/null +++ b/drivers/s390/cio/qdio_debug.c @@ -0,0 +1,372 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2008, 2009 + * + * Author: Jan Glauber (jang@linux.vnet.ibm.com) + */ +#include +#include +#include +#include +#include +#include +#include "qdio_debug.h" +#include "qdio.h" + +debug_info_t *qdio_dbf_setup; +debug_info_t *qdio_dbf_error; + +static struct dentry *debugfs_root; +#define QDIO_DEBUGFS_NAME_LEN 10 +#define QDIO_DBF_NAME_LEN 20 + +struct qdio_dbf_entry { + char dbf_name[QDIO_DBF_NAME_LEN]; + debug_info_t *dbf_info; + struct list_head dbf_list; +}; + +static LIST_HEAD(qdio_dbf_list); +static DEFINE_MUTEX(qdio_dbf_list_mutex); + +static debug_info_t *qdio_get_dbf_entry(char *name) +{ + struct qdio_dbf_entry *entry; + debug_info_t *rc = NULL; + + mutex_lock(&qdio_dbf_list_mutex); + list_for_each_entry(entry, &qdio_dbf_list, dbf_list) { + if (strcmp(entry->dbf_name, name) == 0) { + rc = entry->dbf_info; + break; + } + } + mutex_unlock(&qdio_dbf_list_mutex); + return rc; +} + +static void qdio_clear_dbf_list(void) +{ + struct qdio_dbf_entry *entry, *tmp; + + mutex_lock(&qdio_dbf_list_mutex); + list_for_each_entry_safe(entry, tmp, &qdio_dbf_list, dbf_list) { + list_del(&entry->dbf_list); + debug_unregister(entry->dbf_info); + kfree(entry); + } + mutex_unlock(&qdio_dbf_list_mutex); +} + +int qdio_allocate_dbf(struct qdio_initialize *init_data, + struct qdio_irq *irq_ptr) +{ + char text[QDIO_DBF_NAME_LEN]; + struct qdio_dbf_entry *new_entry; + + DBF_EVENT("qfmt:%1d", init_data->q_format); + DBF_HEX(init_data->adapter_name, 8); + DBF_EVENT("qpff%4x", init_data->qib_param_field_format); + DBF_HEX(&init_data->qib_param_field, sizeof(void *)); + DBF_HEX(&init_data->input_slib_elements, sizeof(void *)); + DBF_HEX(&init_data->output_slib_elements, sizeof(void *)); + DBF_EVENT("niq:%1d noq:%1d", init_data->no_input_qs, + init_data->no_output_qs); + DBF_HEX(&init_data->input_handler, sizeof(void *)); + DBF_HEX(&init_data->output_handler, sizeof(void *)); + DBF_HEX(&init_data->int_parm, sizeof(long)); + DBF_HEX(&init_data->input_sbal_addr_array, sizeof(void *)); + DBF_HEX(&init_data->output_sbal_addr_array, sizeof(void *)); + DBF_EVENT("irq:%8lx", (unsigned long)irq_ptr); + + /* allocate trace view for the interface */ + snprintf(text, QDIO_DBF_NAME_LEN, "qdio_%s", + dev_name(&init_data->cdev->dev)); + irq_ptr->debug_area = qdio_get_dbf_entry(text); + if (irq_ptr->debug_area) + DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf reused"); + else { + irq_ptr->debug_area = debug_register(text, 2, 1, 16); + if (!irq_ptr->debug_area) + return -ENOMEM; + if (debug_register_view(irq_ptr->debug_area, + &debug_hex_ascii_view)) { + debug_unregister(irq_ptr->debug_area); + return -ENOMEM; + } + debug_set_level(irq_ptr->debug_area, DBF_WARN); + DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf created"); + new_entry = kzalloc(sizeof(struct qdio_dbf_entry), GFP_KERNEL); + if (!new_entry) { + debug_unregister(irq_ptr->debug_area); + return -ENOMEM; + } + strlcpy(new_entry->dbf_name, text, QDIO_DBF_NAME_LEN); + new_entry->dbf_info = irq_ptr->debug_area; + mutex_lock(&qdio_dbf_list_mutex); + list_add(&new_entry->dbf_list, &qdio_dbf_list); + mutex_unlock(&qdio_dbf_list_mutex); + } + return 0; +} + +static int qstat_show(struct seq_file *m, void *v) +{ + unsigned char state; + struct qdio_q *q = m->private; + int i; + + if (!q) + return 0; + + seq_printf(m, "Timestamp: %Lx Last AI: %Lx\n", + q->timestamp, last_ai_time); + seq_printf(m, "nr_used: %d ftc: %d last_move: %d\n", + atomic_read(&q->nr_buf_used), + q->first_to_check, q->last_move); + if (q->is_input_q) { + seq_printf(m, "polling: %d ack start: %d ack count: %d\n", + q->u.in.polling, q->u.in.ack_start, + q->u.in.ack_count); + seq_printf(m, "DSCI: %d IRQs disabled: %u\n", + *(u32 *)q->irq_ptr->dsci, + test_bit(QDIO_QUEUE_IRQS_DISABLED, + &q->u.in.queue_irq_state)); + } + seq_printf(m, "SBAL states:\n"); + seq_printf(m, "|0 |8 |16 |24 |32 |40 |48 |56 63|\n"); + + for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) { + debug_get_buf_state(q, i, &state); + switch (state) { + case SLSB_P_INPUT_NOT_INIT: + case SLSB_P_OUTPUT_NOT_INIT: + seq_printf(m, "N"); + break; + case SLSB_P_OUTPUT_PENDING: + seq_printf(m, "P"); + break; + case SLSB_P_INPUT_PRIMED: + case SLSB_CU_OUTPUT_PRIMED: + seq_printf(m, "+"); + break; + case SLSB_P_INPUT_ACK: + seq_printf(m, "A"); + break; + case SLSB_P_INPUT_ERROR: + case SLSB_P_OUTPUT_ERROR: + seq_printf(m, "x"); + break; + case SLSB_CU_INPUT_EMPTY: + case SLSB_P_OUTPUT_EMPTY: + seq_printf(m, "-"); + break; + case SLSB_P_INPUT_HALTED: + case SLSB_P_OUTPUT_HALTED: + seq_printf(m, "."); + break; + default: + seq_printf(m, "?"); + } + if (i == 63) + seq_printf(m, "\n"); + } + seq_printf(m, "\n"); + seq_printf(m, "|64 |72 |80 |88 |96 |104 |112 | 127|\n"); + + seq_printf(m, "\nSBAL statistics:"); + if (!q->irq_ptr->perf_stat_enabled) { + seq_printf(m, " disabled\n"); + return 0; + } + + seq_printf(m, "\n1 2.. 4.. 8.. " + "16.. 32.. 64.. 127\n"); + for (i = 0; i < ARRAY_SIZE(q->q_stats.nr_sbals); i++) + seq_printf(m, "%-10u ", q->q_stats.nr_sbals[i]); + seq_printf(m, "\nError NOP Total\n%-10u %-10u %-10u\n\n", + q->q_stats.nr_sbal_error, q->q_stats.nr_sbal_nop, + q->q_stats.nr_sbal_total); + return 0; +} + +static int qstat_seq_open(struct inode *inode, struct file *filp) +{ + return single_open(filp, qstat_show, + file_inode(filp)->i_private); +} + +static const struct file_operations debugfs_fops = { + .owner = THIS_MODULE, + .open = qstat_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static char *qperf_names[] = { + "Assumed adapter interrupts", + "QDIO interrupts", + "Requested PCIs", + "Inbound tasklet runs", + "Inbound tasklet resched", + "Inbound tasklet resched2", + "Outbound tasklet runs", + "SIGA read", + "SIGA write", + "SIGA sync", + "Inbound calls", + "Inbound handler", + "Inbound stop_polling", + "Inbound queue full", + "Outbound calls", + "Outbound handler", + "Outbound queue full", + "Outbound fast_requeue", + "Outbound target_full", + "QEBSM eqbs", + "QEBSM eqbs partial", + "QEBSM sqbs", + "QEBSM sqbs partial", + "Discarded interrupts" +}; + +static int qperf_show(struct seq_file *m, void *v) +{ + struct qdio_irq *irq_ptr = m->private; + unsigned int *stat; + int i; + + if (!irq_ptr) + return 0; + if (!irq_ptr->perf_stat_enabled) { + seq_printf(m, "disabled\n"); + return 0; + } + stat = (unsigned int *)&irq_ptr->perf_stat; + + for (i = 0; i < ARRAY_SIZE(qperf_names); i++) + seq_printf(m, "%26s:\t%u\n", + qperf_names[i], *(stat + i)); + return 0; +} + +static ssize_t qperf_seq_write(struct file *file, const char __user *ubuf, + size_t count, loff_t *off) +{ + struct seq_file *seq = file->private_data; + struct qdio_irq *irq_ptr = seq->private; + struct qdio_q *q; + unsigned long val; + int ret, i; + + if (!irq_ptr) + return 0; + + ret = kstrtoul_from_user(ubuf, count, 10, &val); + if (ret) + return ret; + + switch (val) { + case 0: + irq_ptr->perf_stat_enabled = 0; + memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat)); + for_each_input_queue(irq_ptr, q, i) + memset(&q->q_stats, 0, sizeof(q->q_stats)); + for_each_output_queue(irq_ptr, q, i) + memset(&q->q_stats, 0, sizeof(q->q_stats)); + break; + case 1: + irq_ptr->perf_stat_enabled = 1; + break; + } + return count; +} + +static int qperf_seq_open(struct inode *inode, struct file *filp) +{ + return single_open(filp, qperf_show, + file_inode(filp)->i_private); +} + +static const struct file_operations debugfs_perf_fops = { + .owner = THIS_MODULE, + .open = qperf_seq_open, + .read = seq_read, + .write = qperf_seq_write, + .llseek = seq_lseek, + .release = single_release, +}; + +static void setup_debugfs_entry(struct qdio_q *q) +{ + char name[QDIO_DEBUGFS_NAME_LEN]; + + snprintf(name, QDIO_DEBUGFS_NAME_LEN, "%s_%d", + q->is_input_q ? "input" : "output", + q->nr); + q->debugfs_q = debugfs_create_file(name, S_IFREG | S_IRUGO | S_IWUSR, + q->irq_ptr->debugfs_dev, q, &debugfs_fops); + if (IS_ERR(q->debugfs_q)) + q->debugfs_q = NULL; +} + +void qdio_setup_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev) +{ + struct qdio_q *q; + int i; + + irq_ptr->debugfs_dev = debugfs_create_dir(dev_name(&cdev->dev), + debugfs_root); + if (IS_ERR(irq_ptr->debugfs_dev)) + irq_ptr->debugfs_dev = NULL; + + irq_ptr->debugfs_perf = debugfs_create_file("statistics", + S_IFREG | S_IRUGO | S_IWUSR, + irq_ptr->debugfs_dev, irq_ptr, + &debugfs_perf_fops); + if (IS_ERR(irq_ptr->debugfs_perf)) + irq_ptr->debugfs_perf = NULL; + + for_each_input_queue(irq_ptr, q, i) + setup_debugfs_entry(q); + for_each_output_queue(irq_ptr, q, i) + setup_debugfs_entry(q); +} + +void qdio_shutdown_debug_entries(struct qdio_irq *irq_ptr) +{ + struct qdio_q *q; + int i; + + for_each_input_queue(irq_ptr, q, i) + debugfs_remove(q->debugfs_q); + for_each_output_queue(irq_ptr, q, i) + debugfs_remove(q->debugfs_q); + debugfs_remove(irq_ptr->debugfs_perf); + debugfs_remove(irq_ptr->debugfs_dev); +} + +int __init qdio_debug_init(void) +{ + debugfs_root = debugfs_create_dir("qdio", NULL); + + qdio_dbf_setup = debug_register("qdio_setup", 16, 1, 16); + debug_register_view(qdio_dbf_setup, &debug_hex_ascii_view); + debug_set_level(qdio_dbf_setup, DBF_INFO); + DBF_EVENT("dbf created\n"); + + qdio_dbf_error = debug_register("qdio_error", 4, 1, 16); + debug_register_view(qdio_dbf_error, &debug_hex_ascii_view); + debug_set_level(qdio_dbf_error, DBF_INFO); + DBF_ERROR("dbf created\n"); + return 0; +} + +void qdio_debug_exit(void) +{ + qdio_clear_dbf_list(); + debugfs_remove(debugfs_root); + debug_unregister(qdio_dbf_setup); + debug_unregister(qdio_dbf_error); +} diff --git a/drivers/s390/cio/qdio_debug.h b/drivers/s390/cio/qdio_debug.h new file mode 100644 index 000000000..f85f5fa7c --- /dev/null +++ b/drivers/s390/cio/qdio_debug.h @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2008 + * + * Author: Jan Glauber (jang@linux.vnet.ibm.com) + */ +#ifndef QDIO_DEBUG_H +#define QDIO_DEBUG_H + +#include +#include +#include "qdio.h" + +/* that gives us 15 characters in the text event views */ +#define QDIO_DBF_LEN 32 + +extern debug_info_t *qdio_dbf_setup; +extern debug_info_t *qdio_dbf_error; + +#define DBF_ERR 3 /* error conditions */ +#define DBF_WARN 4 /* warning conditions */ +#define DBF_INFO 6 /* informational */ + +#undef DBF_EVENT +#undef DBF_ERROR +#undef DBF_DEV_EVENT + +#define DBF_EVENT(text...) \ + do { \ + char debug_buffer[QDIO_DBF_LEN]; \ + snprintf(debug_buffer, QDIO_DBF_LEN, text); \ + debug_text_event(qdio_dbf_setup, DBF_ERR, debug_buffer); \ + } while (0) + +static inline void DBF_HEX(void *addr, int len) +{ + debug_event(qdio_dbf_setup, DBF_ERR, addr, len); +} + +#define DBF_ERROR(text...) \ + do { \ + char debug_buffer[QDIO_DBF_LEN]; \ + snprintf(debug_buffer, QDIO_DBF_LEN, text); \ + debug_text_event(qdio_dbf_error, DBF_ERR, debug_buffer); \ + } while (0) + +static inline void DBF_ERROR_HEX(void *addr, int len) +{ + debug_event(qdio_dbf_error, DBF_ERR, addr, len); +} + +#define DBF_DEV_EVENT(level, device, text...) \ + do { \ + char debug_buffer[QDIO_DBF_LEN]; \ + if (debug_level_enabled(device->debug_area, level)) { \ + snprintf(debug_buffer, QDIO_DBF_LEN, text); \ + debug_text_event(device->debug_area, level, debug_buffer); \ + } \ + } while (0) + +static inline void DBF_DEV_HEX(struct qdio_irq *dev, void *addr, + int len, int level) +{ + debug_event(dev->debug_area, level, addr, len); +} + +int qdio_allocate_dbf(struct qdio_initialize *init_data, + struct qdio_irq *irq_ptr); +void qdio_setup_debug_entries(struct qdio_irq *irq_ptr, + struct ccw_device *cdev); +void qdio_shutdown_debug_entries(struct qdio_irq *irq_ptr); +int qdio_debug_init(void); +void qdio_debug_exit(void); + +#endif diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c new file mode 100644 index 000000000..4b7cc8d42 --- /dev/null +++ b/drivers/s390/cio/qdio_main.c @@ -0,0 +1,1873 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Linux for s390 qdio support, buffer handling, qdio API and module support. + * + * Copyright IBM Corp. 2000, 2008 + * Author(s): Utz Bacher + * Jan Glauber + * 2.6 cio integration by Cornelia Huck + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "cio.h" +#include "css.h" +#include "device.h" +#include "qdio.h" +#include "qdio_debug.h" + +MODULE_AUTHOR("Utz Bacher ,"\ + "Jan Glauber "); +MODULE_DESCRIPTION("QDIO base support"); +MODULE_LICENSE("GPL"); + +static inline int do_siga_sync(unsigned long schid, + unsigned int out_mask, unsigned int in_mask, + unsigned int fc) +{ + register unsigned long __fc asm ("0") = fc; + register unsigned long __schid asm ("1") = schid; + register unsigned long out asm ("2") = out_mask; + register unsigned long in asm ("3") = in_mask; + int cc; + + asm volatile( + " siga 0\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (cc) + : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); + return cc; +} + +static inline int do_siga_input(unsigned long schid, unsigned int mask, + unsigned int fc) +{ + register unsigned long __fc asm ("0") = fc; + register unsigned long __schid asm ("1") = schid; + register unsigned long __mask asm ("2") = mask; + int cc; + + asm volatile( + " siga 0\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (cc) + : "d" (__fc), "d" (__schid), "d" (__mask) : "cc"); + return cc; +} + +/** + * do_siga_output - perform SIGA-w/wt function + * @schid: subchannel id or in case of QEBSM the subchannel token + * @mask: which output queues to process + * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer + * @fc: function code to perform + * @aob: asynchronous operation block + * + * Returns condition code. + * Note: For IQDC unicast queues only the highest priority queue is processed. + */ +static inline int do_siga_output(unsigned long schid, unsigned long mask, + unsigned int *bb, unsigned int fc, + unsigned long aob) +{ + register unsigned long __fc asm("0") = fc; + register unsigned long __schid asm("1") = schid; + register unsigned long __mask asm("2") = mask; + register unsigned long __aob asm("3") = aob; + int cc; + + asm volatile( + " siga 0\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (cc), "+d" (__fc), "+d" (__aob) + : "d" (__schid), "d" (__mask) + : "cc"); + *bb = __fc >> 31; + return cc; +} + +/** + * qdio_do_eqbs - extract buffer states for QEBSM + * @q: queue to manipulate + * @state: state of the extracted buffers + * @start: buffer number to start at + * @count: count of buffers to examine + * @auto_ack: automatically acknowledge buffers + * + * Returns the number of successfully extracted equal buffer states. + * Stops processing if a state is different from the last buffers state. + */ +static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, + int start, int count, int auto_ack) +{ + int tmp_count = count, tmp_start = start, nr = q->nr; + unsigned int ccq = 0; + + qperf_inc(q, eqbs); + + if (!q->is_input_q) + nr += q->irq_ptr->nr_input_qs; +again: + ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, + auto_ack); + + switch (ccq) { + case 0: + case 32: + /* all done, or next buffer state different */ + return count - tmp_count; + case 96: + /* not all buffers processed */ + qperf_inc(q, eqbs_partial); + DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x", + tmp_count); + return count - tmp_count; + case 97: + /* no buffer processed */ + DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); + goto again; + default: + DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); + DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); + DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); + q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, q->nr, + q->first_to_kick, count, q->irq_ptr->int_parm); + return 0; + } +} + +/** + * qdio_do_sqbs - set buffer states for QEBSM + * @q: queue to manipulate + * @state: new state of the buffers + * @start: first buffer number to change + * @count: how many buffers to change + * + * Returns the number of successfully changed buffers. + * Does retrying until the specified count of buffer states is set or an + * error occurs. + */ +static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, + int count) +{ + unsigned int ccq = 0; + int tmp_count = count, tmp_start = start; + int nr = q->nr; + + if (!count) + return 0; + qperf_inc(q, sqbs); + + if (!q->is_input_q) + nr += q->irq_ptr->nr_input_qs; +again: + ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); + + switch (ccq) { + case 0: + case 32: + /* all done, or active buffer adapter-owned */ + WARN_ON_ONCE(tmp_count); + return count - tmp_count; + case 96: + /* not all buffers processed */ + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); + qperf_inc(q, sqbs_partial); + goto again; + default: + DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); + DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); + DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); + q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, q->nr, + q->first_to_kick, count, q->irq_ptr->int_parm); + return 0; + } +} + +/* + * Returns number of examined buffers and their common state in *state. + * Requested number of buffers-to-examine must be > 0. + */ +static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, + unsigned char *state, unsigned int count, + int auto_ack, int merge_pending) +{ + unsigned char __state = 0; + int i; + + if (is_qebsm(q)) + return qdio_do_eqbs(q, state, bufnr, count, auto_ack); + + /* get initial state: */ + __state = q->slsb.val[bufnr]; + if (merge_pending && __state == SLSB_P_OUTPUT_PENDING) + __state = SLSB_P_OUTPUT_EMPTY; + + for (i = 1; i < count; i++) { + bufnr = next_buf(bufnr); + + /* merge PENDING into EMPTY: */ + if (merge_pending && + q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING && + __state == SLSB_P_OUTPUT_EMPTY) + continue; + + /* stop if next state differs from initial state: */ + if (q->slsb.val[bufnr] != __state) + break; + } + *state = __state; + return i; +} + +static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, + unsigned char *state, int auto_ack) +{ + return get_buf_states(q, bufnr, state, 1, auto_ack, 0); +} + +/* wrap-around safe setting of slsb states, returns number of changed buffers */ +static inline int set_buf_states(struct qdio_q *q, int bufnr, + unsigned char state, int count) +{ + int i; + + if (is_qebsm(q)) + return qdio_do_sqbs(q, state, bufnr, count); + + for (i = 0; i < count; i++) { + xchg(&q->slsb.val[bufnr], state); + bufnr = next_buf(bufnr); + } + return count; +} + +static inline int set_buf_state(struct qdio_q *q, int bufnr, + unsigned char state) +{ + return set_buf_states(q, bufnr, state, 1); +} + +/* set slsb states to initial state */ +static void qdio_init_buf_states(struct qdio_irq *irq_ptr) +{ + struct qdio_q *q; + int i; + + for_each_input_queue(irq_ptr, q, i) + set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, + QDIO_MAX_BUFFERS_PER_Q); + for_each_output_queue(irq_ptr, q, i) + set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, + QDIO_MAX_BUFFERS_PER_Q); +} + +static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, + unsigned int input) +{ + unsigned long schid = *((u32 *) &q->irq_ptr->schid); + unsigned int fc = QDIO_SIGA_SYNC; + int cc; + + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); + qperf_inc(q, siga_sync); + + if (is_qebsm(q)) { + schid = q->irq_ptr->sch_token; + fc |= QDIO_SIGA_QEBSM_FLAG; + } + + cc = do_siga_sync(schid, output, input, fc); + if (unlikely(cc)) + DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); + return (cc) ? -EIO : 0; +} + +static inline int qdio_siga_sync_q(struct qdio_q *q) +{ + if (q->is_input_q) + return qdio_siga_sync(q, 0, q->mask); + else + return qdio_siga_sync(q, q->mask, 0); +} + +static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit, + unsigned long aob) +{ + unsigned long schid = *((u32 *) &q->irq_ptr->schid); + unsigned int fc = QDIO_SIGA_WRITE; + u64 start_time = 0; + int retries = 0, cc; + unsigned long laob = 0; + + WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) || + !q->u.out.use_cq)); + if (q->u.out.use_cq && aob != 0) { + fc = QDIO_SIGA_WRITEQ; + laob = aob; + } + + if (is_qebsm(q)) { + schid = q->irq_ptr->sch_token; + fc |= QDIO_SIGA_QEBSM_FLAG; + } +again: + cc = do_siga_output(schid, q->mask, busy_bit, fc, laob); + + /* hipersocket busy condition */ + if (unlikely(*busy_bit)) { + retries++; + + if (!start_time) { + start_time = get_tod_clock_fast(); + goto again; + } + if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE) + goto again; + } + if (retries) { + DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, + "%4x cc2 BB1:%1d", SCH_NO(q), q->nr); + DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries); + } + return cc; +} + +static inline int qdio_siga_input(struct qdio_q *q) +{ + unsigned long schid = *((u32 *) &q->irq_ptr->schid); + unsigned int fc = QDIO_SIGA_READ; + int cc; + + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); + qperf_inc(q, siga_read); + + if (is_qebsm(q)) { + schid = q->irq_ptr->sch_token; + fc |= QDIO_SIGA_QEBSM_FLAG; + } + + cc = do_siga_input(schid, q->mask, fc); + if (unlikely(cc)) + DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); + return (cc) ? -EIO : 0; +} + +#define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0) +#define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U) + +static inline void qdio_sync_queues(struct qdio_q *q) +{ + /* PCI capable outbound queues will also be scanned so sync them too */ + if (pci_out_supported(q)) + qdio_siga_sync_all(q); + else + qdio_siga_sync_q(q); +} + +int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, + unsigned char *state) +{ + if (need_siga_sync(q)) + qdio_siga_sync_q(q); + return get_buf_states(q, bufnr, state, 1, 0, 0); +} + +static inline void qdio_stop_polling(struct qdio_q *q) +{ + if (!q->u.in.polling) + return; + + q->u.in.polling = 0; + qperf_inc(q, stop_polling); + + /* show the card that we are not polling anymore */ + if (is_qebsm(q)) { + set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, + q->u.in.ack_count); + q->u.in.ack_count = 0; + } else + set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); +} + +static inline void account_sbals(struct qdio_q *q, unsigned int count) +{ + int pos; + + q->q_stats.nr_sbal_total += count; + if (count == QDIO_MAX_BUFFERS_MASK) { + q->q_stats.nr_sbals[7]++; + return; + } + pos = ilog2(count); + q->q_stats.nr_sbals[pos]++; +} + +static void process_buffer_error(struct qdio_q *q, int count) +{ + unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT : + SLSB_P_OUTPUT_NOT_INIT; + + q->qdio_error = QDIO_ERROR_SLSB_STATE; + + /* special handling for no target buffer empty */ + if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q && + q->sbal[q->first_to_check]->element[15].sflags == 0x10) { + qperf_inc(q, target_full); + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", + q->first_to_check); + goto set; + } + + DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); + DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); + DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); + DBF_ERROR("F14:%2x F15:%2x", + q->sbal[q->first_to_check]->element[14].sflags, + q->sbal[q->first_to_check]->element[15].sflags); + +set: + /* + * Interrupts may be avoided as long as the error is present + * so change the buffer state immediately to avoid starvation. + */ + set_buf_states(q, q->first_to_check, state, count); +} + +static inline void inbound_primed(struct qdio_q *q, int count) +{ + int new; + + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count); + + /* for QEBSM the ACK was already set by EQBS */ + if (is_qebsm(q)) { + if (!q->u.in.polling) { + q->u.in.polling = 1; + q->u.in.ack_count = count; + q->u.in.ack_start = q->first_to_check; + return; + } + + /* delete the previous ACK's */ + set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, + q->u.in.ack_count); + q->u.in.ack_count = count; + q->u.in.ack_start = q->first_to_check; + return; + } + + /* + * ACK the newest buffer. The ACK will be removed in qdio_stop_polling + * or by the next inbound run. + */ + new = add_buf(q->first_to_check, count - 1); + if (q->u.in.polling) { + /* reset the previous ACK but first set the new one */ + set_buf_state(q, new, SLSB_P_INPUT_ACK); + set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); + } else { + q->u.in.polling = 1; + set_buf_state(q, new, SLSB_P_INPUT_ACK); + } + + q->u.in.ack_start = new; + count--; + if (!count) + return; + /* need to change ALL buffers to get more interrupts */ + set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); +} + +static int get_inbound_buffer_frontier(struct qdio_q *q) +{ + unsigned char state = 0; + int count; + + q->timestamp = get_tod_clock_fast(); + + /* + * Don't check 128 buffers, as otherwise qdio_inbound_q_moved + * would return 0. + */ + count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); + if (!count) + goto out; + + /* + * No siga sync here, as a PCI or we after a thin interrupt + * already sync'ed the queues. + */ + count = get_buf_states(q, q->first_to_check, &state, count, 1, 0); + if (!count) + goto out; + + switch (state) { + case SLSB_P_INPUT_PRIMED: + inbound_primed(q, count); + q->first_to_check = add_buf(q->first_to_check, count); + if (atomic_sub_return(count, &q->nr_buf_used) == 0) + qperf_inc(q, inbound_queue_full); + if (q->irq_ptr->perf_stat_enabled) + account_sbals(q, count); + break; + case SLSB_P_INPUT_ERROR: + process_buffer_error(q, count); + q->first_to_check = add_buf(q->first_to_check, count); + if (atomic_sub_return(count, &q->nr_buf_used) == 0) + qperf_inc(q, inbound_queue_full); + if (q->irq_ptr->perf_stat_enabled) + account_sbals_error(q, count); + break; + case SLSB_CU_INPUT_EMPTY: + case SLSB_P_INPUT_NOT_INIT: + case SLSB_P_INPUT_ACK: + if (q->irq_ptr->perf_stat_enabled) + q->q_stats.nr_sbal_nop++; + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x", + q->nr, q->first_to_check); + break; + default: + WARN_ON_ONCE(1); + } +out: + return q->first_to_check; +} + +static int qdio_inbound_q_moved(struct qdio_q *q) +{ + int bufnr; + + bufnr = get_inbound_buffer_frontier(q); + + if (bufnr != q->last_move) { + q->last_move = bufnr; + if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) + q->u.in.timestamp = get_tod_clock(); + return 1; + } else + return 0; +} + +static inline int qdio_inbound_q_done(struct qdio_q *q) +{ + unsigned char state = 0; + + if (!atomic_read(&q->nr_buf_used)) + return 1; + + if (need_siga_sync(q)) + qdio_siga_sync_q(q); + get_buf_state(q, q->first_to_check, &state, 0); + + if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) + /* more work coming */ + return 0; + + if (is_thinint_irq(q->irq_ptr)) + return 1; + + /* don't poll under z/VM */ + if (MACHINE_IS_VM) + return 1; + + /* + * At this point we know, that inbound first_to_check + * has (probably) not moved (see qdio_inbound_processing). + */ + if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", + q->first_to_check); + return 1; + } else + return 0; +} + +static inline int contains_aobs(struct qdio_q *q) +{ + return !q->is_input_q && q->u.out.use_cq; +} + +static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count) +{ + unsigned char state = 0; + int j, b = start; + + if (!contains_aobs(q)) + return; + + for (j = 0; j < count; ++j) { + get_buf_state(q, b, &state, 0); + if (state == SLSB_P_OUTPUT_PENDING) { + struct qaob *aob = q->u.out.aobs[b]; + if (aob == NULL) + continue; + + q->u.out.sbal_state[b].flags |= + QDIO_OUTBUF_STATE_FLAG_PENDING; + q->u.out.aobs[b] = NULL; + } else if (state == SLSB_P_OUTPUT_EMPTY) { + q->u.out.sbal_state[b].aob = NULL; + } + b = next_buf(b); + } +} + +static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q, + int bufnr) +{ + unsigned long phys_aob = 0; + + if (!q->use_cq) + return 0; + + if (!q->aobs[bufnr]) { + struct qaob *aob = qdio_allocate_aob(); + q->aobs[bufnr] = aob; + } + if (q->aobs[bufnr]) { + q->sbal_state[bufnr].aob = q->aobs[bufnr]; + q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user; + phys_aob = virt_to_phys(q->aobs[bufnr]); + WARN_ON_ONCE(phys_aob & 0xFF); + } + + q->sbal_state[bufnr].flags = 0; + return phys_aob; +} + +static void qdio_kick_handler(struct qdio_q *q) +{ + int start = q->first_to_kick; + int end = q->first_to_check; + int count; + + if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) + return; + + count = sub_buf(end, start); + + if (q->is_input_q) { + qperf_inc(q, inbound_handler); + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); + } else { + qperf_inc(q, outbound_handler); + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", + start, count); + } + + qdio_handle_aobs(q, start, count); + + q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, + q->irq_ptr->int_parm); + + /* for the next time */ + q->first_to_kick = end; + q->qdio_error = 0; +} + +static inline int qdio_tasklet_schedule(struct qdio_q *q) +{ + if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) { + tasklet_schedule(&q->tasklet); + return 0; + } + return -EPERM; +} + +static void __qdio_inbound_processing(struct qdio_q *q) +{ + qperf_inc(q, tasklet_inbound); + + if (!qdio_inbound_q_moved(q)) + return; + + qdio_kick_handler(q); + + if (!qdio_inbound_q_done(q)) { + /* means poll time is not yet over */ + qperf_inc(q, tasklet_inbound_resched); + if (!qdio_tasklet_schedule(q)) + return; + } + + qdio_stop_polling(q); + /* + * We need to check again to not lose initiative after + * resetting the ACK state. + */ + if (!qdio_inbound_q_done(q)) { + qperf_inc(q, tasklet_inbound_resched2); + qdio_tasklet_schedule(q); + } +} + +void qdio_inbound_processing(unsigned long data) +{ + struct qdio_q *q = (struct qdio_q *)data; + __qdio_inbound_processing(q); +} + +static int get_outbound_buffer_frontier(struct qdio_q *q) +{ + unsigned char state = 0; + int count; + + q->timestamp = get_tod_clock_fast(); + + if (need_siga_sync(q)) + if (((queue_type(q) != QDIO_IQDIO_QFMT) && + !pci_out_supported(q)) || + (queue_type(q) == QDIO_IQDIO_QFMT && + multicast_outbound(q))) + qdio_siga_sync_q(q); + + /* + * Don't check 128 buffers, as otherwise qdio_inbound_q_moved + * would return 0. + */ + count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); + if (!count) + goto out; + + count = get_buf_states(q, q->first_to_check, &state, count, 0, + q->u.out.use_cq); + if (!count) + goto out; + + switch (state) { + case SLSB_P_OUTPUT_EMPTY: + case SLSB_P_OUTPUT_PENDING: + /* the adapter got it */ + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, + "out empty:%1d %02x", q->nr, count); + + atomic_sub(count, &q->nr_buf_used); + q->first_to_check = add_buf(q->first_to_check, count); + if (q->irq_ptr->perf_stat_enabled) + account_sbals(q, count); + + break; + case SLSB_P_OUTPUT_ERROR: + process_buffer_error(q, count); + q->first_to_check = add_buf(q->first_to_check, count); + atomic_sub(count, &q->nr_buf_used); + if (q->irq_ptr->perf_stat_enabled) + account_sbals_error(q, count); + break; + case SLSB_CU_OUTPUT_PRIMED: + /* the adapter has not fetched the output yet */ + if (q->irq_ptr->perf_stat_enabled) + q->q_stats.nr_sbal_nop++; + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", + q->nr); + break; + case SLSB_P_OUTPUT_NOT_INIT: + case SLSB_P_OUTPUT_HALTED: + break; + default: + WARN_ON_ONCE(1); + } + +out: + return q->first_to_check; +} + +/* all buffers processed? */ +static inline int qdio_outbound_q_done(struct qdio_q *q) +{ + return atomic_read(&q->nr_buf_used) == 0; +} + +static inline int qdio_outbound_q_moved(struct qdio_q *q) +{ + int bufnr; + + bufnr = get_outbound_buffer_frontier(q); + + if (bufnr != q->last_move) { + q->last_move = bufnr; + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); + return 1; + } else + return 0; +} + +static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob) +{ + int retries = 0, cc; + unsigned int busy_bit; + + if (!need_siga_out(q)) + return 0; + + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); +retry: + qperf_inc(q, siga_write); + + cc = qdio_siga_output(q, &busy_bit, aob); + switch (cc) { + case 0: + break; + case 2: + if (busy_bit) { + while (++retries < QDIO_BUSY_BIT_RETRIES) { + mdelay(QDIO_BUSY_BIT_RETRY_DELAY); + goto retry; + } + DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); + cc = -EBUSY; + } else { + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); + cc = -ENOBUFS; + } + break; + case 1: + case 3: + DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); + cc = -EIO; + break; + } + if (retries) { + DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); + DBF_ERROR("count:%u", retries); + } + return cc; +} + +static void __qdio_outbound_processing(struct qdio_q *q) +{ + qperf_inc(q, tasklet_outbound); + WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0); + + if (qdio_outbound_q_moved(q)) + qdio_kick_handler(q); + + if (queue_type(q) == QDIO_ZFCP_QFMT) + if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) + goto sched; + + if (q->u.out.pci_out_enabled) + return; + + /* + * Now we know that queue type is either qeth without pci enabled + * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY + * is noticed and outbound_handler is called after some time. + */ + if (qdio_outbound_q_done(q)) + del_timer_sync(&q->u.out.timer); + else + if (!timer_pending(&q->u.out.timer) && + likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) + mod_timer(&q->u.out.timer, jiffies + 10 * HZ); + return; + +sched: + qdio_tasklet_schedule(q); +} + +/* outbound tasklet */ +void qdio_outbound_processing(unsigned long data) +{ + struct qdio_q *q = (struct qdio_q *)data; + __qdio_outbound_processing(q); +} + +void qdio_outbound_timer(struct timer_list *t) +{ + struct qdio_q *q = from_timer(q, t, u.out.timer); + + qdio_tasklet_schedule(q); +} + +static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) +{ + struct qdio_q *out; + int i; + + if (!pci_out_supported(q)) + return; + + for_each_output_queue(q->irq_ptr, out, i) + if (!qdio_outbound_q_done(out)) + qdio_tasklet_schedule(out); +} + +static void __tiqdio_inbound_processing(struct qdio_q *q) +{ + qperf_inc(q, tasklet_inbound); + if (need_siga_sync(q) && need_siga_sync_after_ai(q)) + qdio_sync_queues(q); + + /* + * The interrupt could be caused by a PCI request. Check the + * PCI capable outbound queues. + */ + qdio_check_outbound_after_thinint(q); + + if (!qdio_inbound_q_moved(q)) + return; + + qdio_kick_handler(q); + + if (!qdio_inbound_q_done(q)) { + qperf_inc(q, tasklet_inbound_resched); + if (!qdio_tasklet_schedule(q)) + return; + } + + qdio_stop_polling(q); + /* + * We need to check again to not lose initiative after + * resetting the ACK state. + */ + if (!qdio_inbound_q_done(q)) { + qperf_inc(q, tasklet_inbound_resched2); + qdio_tasklet_schedule(q); + } +} + +void tiqdio_inbound_processing(unsigned long data) +{ + struct qdio_q *q = (struct qdio_q *)data; + __tiqdio_inbound_processing(q); +} + +static inline void qdio_set_state(struct qdio_irq *irq_ptr, + enum qdio_irq_states state) +{ + DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); + + irq_ptr->state = state; + mb(); +} + +static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) +{ + if (irb->esw.esw0.erw.cons) { + DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); + DBF_ERROR_HEX(irb, 64); + DBF_ERROR_HEX(irb->ecw, 64); + } +} + +/* PCI interrupt handler */ +static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) +{ + int i; + struct qdio_q *q; + + if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) + return; + + for_each_input_queue(irq_ptr, q, i) { + if (q->u.in.queue_start_poll) { + /* skip if polling is enabled or already in work */ + if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, + &q->u.in.queue_irq_state)) { + qperf_inc(q, int_discarded); + continue; + } + q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, + q->irq_ptr->int_parm); + } else { + tasklet_schedule(&q->tasklet); + } + } + + if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) + return; + + for_each_output_queue(irq_ptr, q, i) { + if (qdio_outbound_q_done(q)) + continue; + if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) + qdio_siga_sync_q(q); + qdio_tasklet_schedule(q); + } +} + +static void qdio_handle_activate_check(struct ccw_device *cdev, + unsigned long intparm, int cstat, int dstat) +{ + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + struct qdio_q *q; + int count; + + DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); + DBF_ERROR("intp :%lx", intparm); + DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); + + if (irq_ptr->nr_input_qs) { + q = irq_ptr->input_qs[0]; + } else if (irq_ptr->nr_output_qs) { + q = irq_ptr->output_qs[0]; + } else { + dump_stack(); + goto no_handler; + } + + count = sub_buf(q->first_to_check, q->first_to_kick); + q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE, + q->nr, q->first_to_kick, count, irq_ptr->int_parm); +no_handler: + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); + /* + * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. + * Therefore we call the LGR detection function here. + */ + lgr_info_log(); +} + +static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, + int dstat) +{ + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + + DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); + + if (cstat) + goto error; + if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) + goto error; + if (!(dstat & DEV_STAT_DEV_END)) + goto error; + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); + return; + +error: + DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); + DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); +} + +/* qdio interrupt handler */ +void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, + struct irb *irb) +{ + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + struct subchannel_id schid; + int cstat, dstat; + + if (!intparm || !irq_ptr) { + ccw_device_get_schid(cdev, &schid); + DBF_ERROR("qint:%4x", schid.sch_no); + return; + } + + if (irq_ptr->perf_stat_enabled) + irq_ptr->perf_stat.qdio_int++; + + if (IS_ERR(irb)) { + DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); + wake_up(&cdev->private->wait_q); + return; + } + qdio_irq_check_sense(irq_ptr, irb); + cstat = irb->scsw.cmd.cstat; + dstat = irb->scsw.cmd.dstat; + + switch (irq_ptr->state) { + case QDIO_IRQ_STATE_INACTIVE: + qdio_establish_handle_irq(cdev, cstat, dstat); + break; + case QDIO_IRQ_STATE_CLEANUP: + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); + break; + case QDIO_IRQ_STATE_ESTABLISHED: + case QDIO_IRQ_STATE_ACTIVE: + if (cstat & SCHN_STAT_PCI) { + qdio_int_handler_pci(irq_ptr); + return; + } + if (cstat || dstat) + qdio_handle_activate_check(cdev, intparm, cstat, + dstat); + break; + case QDIO_IRQ_STATE_STOPPED: + break; + default: + WARN_ON_ONCE(1); + } + wake_up(&cdev->private->wait_q); +} + +/** + * qdio_get_ssqd_desc - get qdio subchannel description + * @cdev: ccw device to get description for + * @data: where to store the ssqd + * + * Returns 0 or an error code. The results of the chsc are stored in the + * specified structure. + */ +int qdio_get_ssqd_desc(struct ccw_device *cdev, + struct qdio_ssqd_desc *data) +{ + struct subchannel_id schid; + + if (!cdev || !cdev->private) + return -EINVAL; + + ccw_device_get_schid(cdev, &schid); + DBF_EVENT("get ssqd:%4x", schid.sch_no); + return qdio_setup_get_ssqd(NULL, &schid, data); +} +EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); + +static void qdio_shutdown_queues(struct ccw_device *cdev) +{ + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + struct qdio_q *q; + int i; + + for_each_input_queue(irq_ptr, q, i) + tasklet_kill(&q->tasklet); + + for_each_output_queue(irq_ptr, q, i) { + del_timer_sync(&q->u.out.timer); + tasklet_kill(&q->tasklet); + } +} + +/** + * qdio_shutdown - shut down a qdio subchannel + * @cdev: associated ccw device + * @how: use halt or clear to shutdown + */ +int qdio_shutdown(struct ccw_device *cdev, int how) +{ + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + struct subchannel_id schid; + int rc; + + if (!irq_ptr) + return -ENODEV; + + WARN_ON_ONCE(irqs_disabled()); + ccw_device_get_schid(cdev, &schid); + DBF_EVENT("qshutdown:%4x", schid.sch_no); + + mutex_lock(&irq_ptr->setup_mutex); + /* + * Subchannel was already shot down. We cannot prevent being called + * twice since cio may trigger a shutdown asynchronously. + */ + if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { + mutex_unlock(&irq_ptr->setup_mutex); + return 0; + } + + /* + * Indicate that the device is going down. Scheduling the queue + * tasklets is forbidden from here on. + */ + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); + + tiqdio_remove_input_queues(irq_ptr); + qdio_shutdown_queues(cdev); + qdio_shutdown_debug_entries(irq_ptr); + + /* cleanup subchannel */ + spin_lock_irq(get_ccwdev_lock(cdev)); + + if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) + rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); + else + /* default behaviour is halt */ + rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); + if (rc) { + DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); + DBF_ERROR("rc:%4d", rc); + goto no_cleanup; + } + + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); + spin_unlock_irq(get_ccwdev_lock(cdev)); + wait_event_interruptible_timeout(cdev->private->wait_q, + irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || + irq_ptr->state == QDIO_IRQ_STATE_ERR, + 10 * HZ); + spin_lock_irq(get_ccwdev_lock(cdev)); + +no_cleanup: + qdio_shutdown_thinint(irq_ptr); + + /* restore interrupt handler */ + if ((void *)cdev->handler == (void *)qdio_int_handler) { + cdev->handler = irq_ptr->orig_handler; + cdev->private->intparm = 0; + } + spin_unlock_irq(get_ccwdev_lock(cdev)); + + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); + mutex_unlock(&irq_ptr->setup_mutex); + if (rc) + return rc; + return 0; +} +EXPORT_SYMBOL_GPL(qdio_shutdown); + +/** + * qdio_free - free data structures for a qdio subchannel + * @cdev: associated ccw device + */ +int qdio_free(struct ccw_device *cdev) +{ + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + struct subchannel_id schid; + + if (!irq_ptr) + return -ENODEV; + + ccw_device_get_schid(cdev, &schid); + DBF_EVENT("qfree:%4x", schid.sch_no); + DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned"); + mutex_lock(&irq_ptr->setup_mutex); + + irq_ptr->debug_area = NULL; + cdev->private->qdio_data = NULL; + mutex_unlock(&irq_ptr->setup_mutex); + + qdio_release_memory(irq_ptr); + return 0; +} +EXPORT_SYMBOL_GPL(qdio_free); + +/** + * qdio_allocate - allocate qdio queues and associated data + * @init_data: initialization data + */ +int qdio_allocate(struct qdio_initialize *init_data) +{ + struct subchannel_id schid; + struct qdio_irq *irq_ptr; + + ccw_device_get_schid(init_data->cdev, &schid); + DBF_EVENT("qallocate:%4x", schid.sch_no); + + if ((init_data->no_input_qs && !init_data->input_handler) || + (init_data->no_output_qs && !init_data->output_handler)) + return -EINVAL; + + if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || + (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) + return -EINVAL; + + if ((!init_data->input_sbal_addr_array) || + (!init_data->output_sbal_addr_array)) + return -EINVAL; + + /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ + irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!irq_ptr) + goto out_err; + + mutex_init(&irq_ptr->setup_mutex); + if (qdio_allocate_dbf(init_data, irq_ptr)) + goto out_rel; + + /* + * Allocate a page for the chsc calls in qdio_establish. + * Must be pre-allocated since a zfcp recovery will call + * qdio_establish. In case of low memory and swap on a zfcp disk + * we may not be able to allocate memory otherwise. + */ + irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); + if (!irq_ptr->chsc_page) + goto out_rel; + + /* qdr is used in ccw1.cda which is u32 */ + irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!irq_ptr->qdr) + goto out_rel; + + if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, + init_data->no_output_qs)) + goto out_rel; + + init_data->cdev->private->qdio_data = irq_ptr; + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); + return 0; +out_rel: + qdio_release_memory(irq_ptr); +out_err: + return -ENOMEM; +} +EXPORT_SYMBOL_GPL(qdio_allocate); + +static void qdio_detect_hsicq(struct qdio_irq *irq_ptr) +{ + struct qdio_q *q = irq_ptr->input_qs[0]; + int i, use_cq = 0; + + if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT) + use_cq = 1; + + for_each_output_queue(irq_ptr, q, i) { + if (use_cq) { + if (qdio_enable_async_operation(&q->u.out) < 0) { + use_cq = 0; + continue; + } + } else + qdio_disable_async_operation(&q->u.out); + } + DBF_EVENT("use_cq:%d", use_cq); +} + +/** + * qdio_establish - establish queues on a qdio subchannel + * @init_data: initialization data + */ +int qdio_establish(struct qdio_initialize *init_data) +{ + struct ccw_device *cdev = init_data->cdev; + struct subchannel_id schid; + struct qdio_irq *irq_ptr; + int rc; + + ccw_device_get_schid(cdev, &schid); + DBF_EVENT("qestablish:%4x", schid.sch_no); + + irq_ptr = cdev->private->qdio_data; + if (!irq_ptr) + return -ENODEV; + + mutex_lock(&irq_ptr->setup_mutex); + qdio_setup_irq(init_data); + + rc = qdio_establish_thinint(irq_ptr); + if (rc) { + mutex_unlock(&irq_ptr->setup_mutex); + qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); + return rc; + } + + /* establish q */ + irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; + irq_ptr->ccw.flags = CCW_FLAG_SLI; + irq_ptr->ccw.count = irq_ptr->equeue.count; + irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); + + spin_lock_irq(get_ccwdev_lock(cdev)); + ccw_device_set_options_mask(cdev, 0); + + rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); + spin_unlock_irq(get_ccwdev_lock(cdev)); + if (rc) { + DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); + DBF_ERROR("rc:%4x", rc); + mutex_unlock(&irq_ptr->setup_mutex); + qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); + return rc; + } + + wait_event_interruptible_timeout(cdev->private->wait_q, + irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || + irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); + + if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { + mutex_unlock(&irq_ptr->setup_mutex); + qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); + return -EIO; + } + + qdio_setup_ssqd_info(irq_ptr); + + qdio_detect_hsicq(irq_ptr); + + /* qebsm is now setup if available, initialize buffer states */ + qdio_init_buf_states(irq_ptr); + + mutex_unlock(&irq_ptr->setup_mutex); + qdio_print_subchannel_info(irq_ptr, cdev); + qdio_setup_debug_entries(irq_ptr, cdev); + return 0; +} +EXPORT_SYMBOL_GPL(qdio_establish); + +/** + * qdio_activate - activate queues on a qdio subchannel + * @cdev: associated cdev + */ +int qdio_activate(struct ccw_device *cdev) +{ + struct subchannel_id schid; + struct qdio_irq *irq_ptr; + int rc; + + ccw_device_get_schid(cdev, &schid); + DBF_EVENT("qactivate:%4x", schid.sch_no); + + irq_ptr = cdev->private->qdio_data; + if (!irq_ptr) + return -ENODEV; + + mutex_lock(&irq_ptr->setup_mutex); + if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { + rc = -EBUSY; + goto out; + } + + irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; + irq_ptr->ccw.flags = CCW_FLAG_SLI; + irq_ptr->ccw.count = irq_ptr->aqueue.count; + irq_ptr->ccw.cda = 0; + + spin_lock_irq(get_ccwdev_lock(cdev)); + ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); + + rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, + 0, DOIO_DENY_PREFETCH); + spin_unlock_irq(get_ccwdev_lock(cdev)); + if (rc) { + DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); + DBF_ERROR("rc:%4x", rc); + goto out; + } + + if (is_thinint_irq(irq_ptr)) + tiqdio_add_input_queues(irq_ptr); + + /* wait for subchannel to become active */ + msleep(5); + + switch (irq_ptr->state) { + case QDIO_IRQ_STATE_STOPPED: + case QDIO_IRQ_STATE_ERR: + rc = -EIO; + break; + default: + qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); + rc = 0; + } +out: + mutex_unlock(&irq_ptr->setup_mutex); + return rc; +} +EXPORT_SYMBOL_GPL(qdio_activate); + +static inline int buf_in_between(int bufnr, int start, int count) +{ + int end = add_buf(start, count); + + if (end > start) { + if (bufnr >= start && bufnr < end) + return 1; + else + return 0; + } + + /* wrap-around case */ + if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || + (bufnr < end)) + return 1; + else + return 0; +} + +/** + * handle_inbound - reset processed input buffers + * @q: queue containing the buffers + * @callflags: flags + * @bufnr: first buffer to process + * @count: how many buffers are emptied + */ +static int handle_inbound(struct qdio_q *q, unsigned int callflags, + int bufnr, int count) +{ + int diff; + + qperf_inc(q, inbound_call); + + if (!q->u.in.polling) + goto set; + + /* protect against stop polling setting an ACK for an emptied slsb */ + if (count == QDIO_MAX_BUFFERS_PER_Q) { + /* overwriting everything, just delete polling status */ + q->u.in.polling = 0; + q->u.in.ack_count = 0; + goto set; + } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { + if (is_qebsm(q)) { + /* partial overwrite, just update ack_start */ + diff = add_buf(bufnr, count); + diff = sub_buf(diff, q->u.in.ack_start); + q->u.in.ack_count -= diff; + if (q->u.in.ack_count <= 0) { + q->u.in.polling = 0; + q->u.in.ack_count = 0; + goto set; + } + q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); + } + else + /* the only ACK will be deleted, so stop polling */ + q->u.in.polling = 0; + } + +set: + count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); + atomic_add(count, &q->nr_buf_used); + + if (need_siga_in(q)) + return qdio_siga_input(q); + + return 0; +} + +/** + * handle_outbound - process filled outbound buffers + * @q: queue containing the buffers + * @callflags: flags + * @bufnr: first buffer to process + * @count: how many buffers are filled + */ +static int handle_outbound(struct qdio_q *q, unsigned int callflags, + int bufnr, int count) +{ + unsigned char state = 0; + int used, rc = 0; + + qperf_inc(q, outbound_call); + + count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); + used = atomic_add_return(count, &q->nr_buf_used); + + if (used == QDIO_MAX_BUFFERS_PER_Q) + qperf_inc(q, outbound_queue_full); + + if (callflags & QDIO_FLAG_PCI_OUT) { + q->u.out.pci_out_enabled = 1; + qperf_inc(q, pci_request_int); + } else + q->u.out.pci_out_enabled = 0; + + if (queue_type(q) == QDIO_IQDIO_QFMT) { + unsigned long phys_aob = 0; + + /* One SIGA-W per buffer required for unicast HSI */ + WARN_ON_ONCE(count > 1 && !multicast_outbound(q)); + + phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr); + + rc = qdio_kick_outbound_q(q, phys_aob); + } else if (need_siga_sync(q)) { + rc = qdio_siga_sync_q(q); + } else if (count < QDIO_MAX_BUFFERS_PER_Q && + get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 && + state == SLSB_CU_OUTPUT_PRIMED) { + /* The previous buffer is not processed yet, tack on. */ + qperf_inc(q, fast_requeue); + } else { + rc = qdio_kick_outbound_q(q, 0); + } + + /* in case of SIGA errors we must process the error immediately */ + if (used >= q->u.out.scan_threshold || rc) + qdio_tasklet_schedule(q); + else + /* free the SBALs in case of no further traffic */ + if (!timer_pending(&q->u.out.timer) && + likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) + mod_timer(&q->u.out.timer, jiffies + HZ); + return rc; +} + +/** + * do_QDIO - process input or output buffers + * @cdev: associated ccw_device for the qdio subchannel + * @callflags: input or output and special flags from the program + * @q_nr: queue number + * @bufnr: buffer number + * @count: how many buffers to process + */ +int do_QDIO(struct ccw_device *cdev, unsigned int callflags, + int q_nr, unsigned int bufnr, unsigned int count) +{ + struct qdio_irq *irq_ptr; + + if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) + return -EINVAL; + + irq_ptr = cdev->private->qdio_data; + if (!irq_ptr) + return -ENODEV; + + DBF_DEV_EVENT(DBF_INFO, irq_ptr, + "do%02x b:%02x c:%02x", callflags, bufnr, count); + + if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) + return -EIO; + if (!count) + return 0; + if (callflags & QDIO_FLAG_SYNC_INPUT) + return handle_inbound(irq_ptr->input_qs[q_nr], + callflags, bufnr, count); + else if (callflags & QDIO_FLAG_SYNC_OUTPUT) + return handle_outbound(irq_ptr->output_qs[q_nr], + callflags, bufnr, count); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(do_QDIO); + +/** + * qdio_start_irq - process input buffers + * @cdev: associated ccw_device for the qdio subchannel + * @nr: input queue number + * + * Return codes + * 0 - success + * 1 - irqs not started since new data is available + */ +int qdio_start_irq(struct ccw_device *cdev, int nr) +{ + struct qdio_q *q; + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + + if (!irq_ptr) + return -ENODEV; + q = irq_ptr->input_qs[nr]; + + clear_nonshared_ind(irq_ptr); + qdio_stop_polling(q); + clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); + + /* + * We need to check again to not lose initiative after + * resetting the ACK state. + */ + if (test_nonshared_ind(irq_ptr)) + goto rescan; + if (!qdio_inbound_q_done(q)) + goto rescan; + return 0; + +rescan: + if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, + &q->u.in.queue_irq_state)) + return 0; + else + return 1; + +} +EXPORT_SYMBOL(qdio_start_irq); + +/** + * qdio_get_next_buffers - process input buffers + * @cdev: associated ccw_device for the qdio subchannel + * @nr: input queue number + * @bufnr: first filled buffer number + * @error: buffers are in error state + * + * Return codes + * < 0 - error + * = 0 - no new buffers found + * > 0 - number of processed buffers + */ +int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, + int *error) +{ + struct qdio_q *q; + int start, end; + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + + if (!irq_ptr) + return -ENODEV; + q = irq_ptr->input_qs[nr]; + + /* + * Cannot rely on automatic sync after interrupt since queues may + * also be examined without interrupt. + */ + if (need_siga_sync(q)) + qdio_sync_queues(q); + + /* check the PCI capable outbound queues. */ + qdio_check_outbound_after_thinint(q); + + if (!qdio_inbound_q_moved(q)) + return 0; + + /* Note: upper-layer MUST stop processing immediately here ... */ + if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) + return -EIO; + + start = q->first_to_kick; + end = q->first_to_check; + *bufnr = start; + *error = q->qdio_error; + + /* for the next time */ + q->first_to_kick = end; + q->qdio_error = 0; + return sub_buf(end, start); +} +EXPORT_SYMBOL(qdio_get_next_buffers); + +/** + * qdio_stop_irq - disable interrupt processing for the device + * @cdev: associated ccw_device for the qdio subchannel + * @nr: input queue number + * + * Return codes + * 0 - interrupts were already disabled + * 1 - interrupts successfully disabled + */ +int qdio_stop_irq(struct ccw_device *cdev, int nr) +{ + struct qdio_q *q; + struct qdio_irq *irq_ptr = cdev->private->qdio_data; + + if (!irq_ptr) + return -ENODEV; + q = irq_ptr->input_qs[nr]; + + if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, + &q->u.in.queue_irq_state)) + return 0; + else + return 1; +} +EXPORT_SYMBOL(qdio_stop_irq); + +/** + * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info. + * @schid: Subchannel ID. + * @cnc: Boolean Change-Notification Control + * @response: Response code will be stored at this address + * @cb: Callback function will be executed for each element + * of the address list + * @priv: Pointer to pass to the callback function. + * + * Performs "Store-network-bridging-information list" operation and calls + * the callback function for every entry in the list. If "change- + * notification-control" is set, further changes in the address list + * will be reported via the IPA command. + */ +int qdio_pnso_brinfo(struct subchannel_id schid, + int cnc, u16 *response, + void (*cb)(void *priv, enum qdio_brinfo_entry_type type, + void *entry), + void *priv) +{ + struct chsc_pnso_area *rr; + int rc; + u32 prev_instance = 0; + int isfirstblock = 1; + int i, size, elems; + + rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL); + if (rr == NULL) + return -ENOMEM; + do { + /* on the first iteration, naihdr.resume_token will be zero */ + rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc); + if (rc != 0 && rc != -EBUSY) + goto out; + if (rr->response.code != 1) { + rc = -EIO; + continue; + } else + rc = 0; + + if (cb == NULL) + continue; + + size = rr->naihdr.naids; + elems = (rr->response.length - + sizeof(struct chsc_header) - + sizeof(struct chsc_brinfo_naihdr)) / + size; + + if (!isfirstblock && (rr->naihdr.instance != prev_instance)) { + /* Inform the caller that they need to scrap */ + /* the data that was already reported via cb */ + rc = -EAGAIN; + break; + } + isfirstblock = 0; + prev_instance = rr->naihdr.instance; + for (i = 0; i < elems; i++) + switch (size) { + case sizeof(struct qdio_brinfo_entry_l3_ipv6): + (*cb)(priv, l3_ipv6_addr, + &rr->entries.l3_ipv6[i]); + break; + case sizeof(struct qdio_brinfo_entry_l3_ipv4): + (*cb)(priv, l3_ipv4_addr, + &rr->entries.l3_ipv4[i]); + break; + case sizeof(struct qdio_brinfo_entry_l2): + (*cb)(priv, l2_addr_lnid, + &rr->entries.l2[i]); + break; + default: + WARN_ON_ONCE(1); + rc = -EIO; + goto out; + } + } while (rr->response.code == 0x0107 || /* channel busy */ + (rr->response.code == 1 && /* list stored */ + /* resume token is non-zero => list incomplete */ + (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2))); + (*response) = rr->response.code; + +out: + free_page((unsigned long)rr); + return rc; +} +EXPORT_SYMBOL_GPL(qdio_pnso_brinfo); + +static int __init init_QDIO(void) +{ + int rc; + + rc = qdio_debug_init(); + if (rc) + return rc; + rc = qdio_setup_init(); + if (rc) + goto out_debug; + rc = tiqdio_allocate_memory(); + if (rc) + goto out_cache; + rc = tiqdio_register_thinints(); + if (rc) + goto out_ti; + return 0; + +out_ti: + tiqdio_free_memory(); +out_cache: + qdio_setup_exit(); +out_debug: + qdio_debug_exit(); + return rc; +} + +static void __exit exit_QDIO(void) +{ + tiqdio_unregister_thinints(); + tiqdio_free_memory(); + qdio_setup_exit(); + qdio_debug_exit(); +} + +module_init(init_QDIO); +module_exit(exit_QDIO); diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c new file mode 100644 index 000000000..b8955e20f --- /dev/null +++ b/drivers/s390/cio/qdio_setup.c @@ -0,0 +1,595 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * qdio queue initialization + * + * Copyright IBM Corp. 2008 + * Author(s): Jan Glauber + */ +#include +#include +#include +#include +#include + +#include "cio.h" +#include "css.h" +#include "device.h" +#include "ioasm.h" +#include "chsc.h" +#include "qdio.h" +#include "qdio_debug.h" + +#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer)) + +static struct kmem_cache *qdio_q_cache; +static struct kmem_cache *qdio_aob_cache; + +struct qaob *qdio_allocate_aob(void) +{ + return kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC); +} +EXPORT_SYMBOL_GPL(qdio_allocate_aob); + +void qdio_release_aob(struct qaob *aob) +{ + kmem_cache_free(qdio_aob_cache, aob); +} +EXPORT_SYMBOL_GPL(qdio_release_aob); + +/** + * qdio_free_buffers() - free qdio buffers + * @buf: array of pointers to qdio buffers + * @count: number of qdio buffers to free + */ +void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count) +{ + int pos; + + for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) + free_page((unsigned long) buf[pos]); +} +EXPORT_SYMBOL_GPL(qdio_free_buffers); + +/** + * qdio_alloc_buffers() - allocate qdio buffers + * @buf: array of pointers to qdio buffers + * @count: number of qdio buffers to allocate + */ +int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count) +{ + int pos; + + for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) { + buf[pos] = (void *) get_zeroed_page(GFP_KERNEL); + if (!buf[pos]) { + qdio_free_buffers(buf, count); + return -ENOMEM; + } + } + for (pos = 0; pos < count; pos++) + if (pos % QBUFF_PER_PAGE) + buf[pos] = buf[pos - 1] + 1; + return 0; +} +EXPORT_SYMBOL_GPL(qdio_alloc_buffers); + +/** + * qdio_reset_buffers() - reset qdio buffers + * @buf: array of pointers to qdio buffers + * @count: number of qdio buffers that will be zeroed + */ +void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count) +{ + int pos; + + for (pos = 0; pos < count; pos++) + memset(buf[pos], 0, sizeof(struct qdio_buffer)); +} +EXPORT_SYMBOL_GPL(qdio_reset_buffers); + +/* + * qebsm is only available under 64bit but the adapter sets the feature + * flag anyway, so we manually override it. + */ +static inline int qebsm_possible(void) +{ + return css_general_characteristics.qebsm; +} + +/* + * qib_param_field: pointer to 128 bytes or NULL, if no param field + * nr_input_qs: pointer to nr_queues*128 words of data or NULL + */ +static void set_impl_params(struct qdio_irq *irq_ptr, + unsigned int qib_param_field_format, + unsigned char *qib_param_field, + unsigned long *input_slib_elements, + unsigned long *output_slib_elements) +{ + struct qdio_q *q; + int i, j; + + if (!irq_ptr) + return; + + irq_ptr->qib.pfmt = qib_param_field_format; + if (qib_param_field) + memcpy(irq_ptr->qib.parm, qib_param_field, + QDIO_MAX_BUFFERS_PER_Q); + + if (!input_slib_elements) + goto output; + + for_each_input_queue(irq_ptr, q, i) { + for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) + q->slib->slibe[j].parms = + input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j]; + } +output: + if (!output_slib_elements) + return; + + for_each_output_queue(irq_ptr, q, i) { + for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) + q->slib->slibe[j].parms = + output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j]; + } +} + +static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues) +{ + struct qdio_q *q; + int i; + + for (i = 0; i < nr_queues; i++) { + q = kmem_cache_zalloc(qdio_q_cache, GFP_KERNEL); + if (!q) + return -ENOMEM; + + q->slib = (struct slib *) __get_free_page(GFP_KERNEL); + if (!q->slib) { + kmem_cache_free(qdio_q_cache, q); + return -ENOMEM; + } + irq_ptr_qs[i] = q; + INIT_LIST_HEAD(&q->entry); + } + return 0; +} + +int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs) +{ + int rc; + + rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs); + if (rc) + return rc; + rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs); + return rc; +} + +static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr, + qdio_handler_t *handler, int i) +{ + struct slib *slib = q->slib; + + /* queue must be cleared for qdio_establish */ + memset(q, 0, sizeof(*q)); + memset(slib, 0, PAGE_SIZE); + q->slib = slib; + q->irq_ptr = irq_ptr; + q->mask = 1 << (31 - i); + q->nr = i; + q->handler = handler; + INIT_LIST_HEAD(&q->entry); +} + +static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr, + void **sbals_array, int i) +{ + struct qdio_q *prev; + int j; + + DBF_HEX(&q, sizeof(void *)); + q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2); + + /* fill in sbal */ + for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) + q->sbal[j] = *sbals_array++; + + /* fill in slib */ + if (i > 0) { + prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1] + : irq_ptr->output_qs[i - 1]; + prev->slib->nsliba = (unsigned long)q->slib; + } + + q->slib->sla = (unsigned long)q->sl; + q->slib->slsba = (unsigned long)&q->slsb.val[0]; + + /* fill in sl */ + for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) + q->sl->element[j].sbal = virt_to_phys(q->sbal[j]); +} + +static void setup_queues(struct qdio_irq *irq_ptr, + struct qdio_initialize *qdio_init) +{ + struct qdio_q *q; + void **input_sbal_array = qdio_init->input_sbal_addr_array; + void **output_sbal_array = qdio_init->output_sbal_addr_array; + struct qdio_outbuf_state *output_sbal_state_array = + qdio_init->output_sbal_state_array; + int i; + + for_each_input_queue(irq_ptr, q, i) { + DBF_EVENT("inq:%1d", i); + setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i); + + q->is_input_q = 1; + q->u.in.queue_start_poll = qdio_init->queue_start_poll_array ? + qdio_init->queue_start_poll_array[i] : NULL; + + setup_storage_lists(q, irq_ptr, input_sbal_array, i); + input_sbal_array += QDIO_MAX_BUFFERS_PER_Q; + + if (is_thinint_irq(irq_ptr)) { + tasklet_init(&q->tasklet, tiqdio_inbound_processing, + (unsigned long) q); + } else { + tasklet_init(&q->tasklet, qdio_inbound_processing, + (unsigned long) q); + } + } + + for_each_output_queue(irq_ptr, q, i) { + DBF_EVENT("outq:%1d", i); + setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i); + + q->u.out.sbal_state = output_sbal_state_array; + output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q; + + q->is_input_q = 0; + q->u.out.scan_threshold = qdio_init->scan_threshold; + setup_storage_lists(q, irq_ptr, output_sbal_array, i); + output_sbal_array += QDIO_MAX_BUFFERS_PER_Q; + + tasklet_init(&q->tasklet, qdio_outbound_processing, + (unsigned long) q); + timer_setup(&q->u.out.timer, qdio_outbound_timer, 0); + } +} + +static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac) +{ + if (qdioac & AC1_SIGA_INPUT_NEEDED) + irq_ptr->siga_flag.input = 1; + if (qdioac & AC1_SIGA_OUTPUT_NEEDED) + irq_ptr->siga_flag.output = 1; + if (qdioac & AC1_SIGA_SYNC_NEEDED) + irq_ptr->siga_flag.sync = 1; + if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT)) + irq_ptr->siga_flag.sync_after_ai = 1; + if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI)) + irq_ptr->siga_flag.sync_out_after_pci = 1; +} + +static void check_and_setup_qebsm(struct qdio_irq *irq_ptr, + unsigned char qdioac, unsigned long token) +{ + if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM)) + goto no_qebsm; + if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) || + (!(qdioac & AC1_SC_QEBSM_ENABLED))) + goto no_qebsm; + + irq_ptr->sch_token = token; + + DBF_EVENT("V=V:1"); + DBF_EVENT("%8lx", irq_ptr->sch_token); + return; + +no_qebsm: + irq_ptr->sch_token = 0; + irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM; + DBF_EVENT("noV=V"); +} + +/* + * If there is a qdio_irq we use the chsc_page and store the information + * in the qdio_irq, otherwise we copy it to the specified structure. + */ +int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr, + struct subchannel_id *schid, + struct qdio_ssqd_desc *data) +{ + struct chsc_ssqd_area *ssqd; + int rc; + + DBF_EVENT("getssqd:%4x", schid->sch_no); + if (!irq_ptr) { + ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL); + if (!ssqd) + return -ENOMEM; + } else { + ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page; + } + + rc = chsc_ssqd(*schid, ssqd); + if (rc) + goto out; + + if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) || + !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) || + (ssqd->qdio_ssqd.sch != schid->sch_no)) + rc = -EINVAL; + + if (!rc) + memcpy(data, &ssqd->qdio_ssqd, sizeof(*data)); + +out: + if (!irq_ptr) + free_page((unsigned long)ssqd); + + return rc; +} + +void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr) +{ + unsigned char qdioac; + int rc; + + rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc); + if (rc) { + DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no); + DBF_ERROR("rc:%x", rc); + /* all flags set, worst case */ + qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED | + AC1_SIGA_SYNC_NEEDED; + } else + qdioac = irq_ptr->ssqd_desc.qdioac1; + + check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token); + process_ac_flags(irq_ptr, qdioac); + DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2); + DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac); +} + +void qdio_release_memory(struct qdio_irq *irq_ptr) +{ + struct qdio_q *q; + int i; + + /* + * Must check queue array manually since irq_ptr->nr_input_queues / + * irq_ptr->nr_input_queues may not yet be set. + */ + for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) { + q = irq_ptr->input_qs[i]; + if (q) { + free_page((unsigned long) q->slib); + kmem_cache_free(qdio_q_cache, q); + } + } + for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) { + q = irq_ptr->output_qs[i]; + if (q) { + if (q->u.out.use_cq) { + int n; + + for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) { + struct qaob *aob = q->u.out.aobs[n]; + if (aob) { + qdio_release_aob(aob); + q->u.out.aobs[n] = NULL; + } + } + + qdio_disable_async_operation(&q->u.out); + } + free_page((unsigned long) q->slib); + kmem_cache_free(qdio_q_cache, q); + } + } + free_page((unsigned long) irq_ptr->qdr); + free_page(irq_ptr->chsc_page); + free_page((unsigned long) irq_ptr); +} + +static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr, + struct qdio_q **irq_ptr_qs, + int i, int nr) +{ + irq_ptr->qdr->qdf0[i + nr].sliba = + (unsigned long)irq_ptr_qs[i]->slib; + + irq_ptr->qdr->qdf0[i + nr].sla = + (unsigned long)irq_ptr_qs[i]->sl; + + irq_ptr->qdr->qdf0[i + nr].slsba = + (unsigned long)&irq_ptr_qs[i]->slsb.val[0]; + + irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4; + irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4; + irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4; + irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4; +} + +static void setup_qdr(struct qdio_irq *irq_ptr, + struct qdio_initialize *qdio_init) +{ + int i; + + irq_ptr->qdr->qfmt = qdio_init->q_format; + irq_ptr->qdr->ac = qdio_init->qdr_ac; + irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs; + irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs; + irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */ + irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4; + irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib; + irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4; + + for (i = 0; i < qdio_init->no_input_qs; i++) + __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0); + + for (i = 0; i < qdio_init->no_output_qs; i++) + __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i, + qdio_init->no_input_qs); +} + +static void setup_qib(struct qdio_irq *irq_ptr, + struct qdio_initialize *init_data) +{ + if (qebsm_possible()) + irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM; + + irq_ptr->qib.rflags |= init_data->qib_rflags; + + irq_ptr->qib.qfmt = init_data->q_format; + if (init_data->no_input_qs) + irq_ptr->qib.isliba = + (unsigned long)(irq_ptr->input_qs[0]->slib); + if (init_data->no_output_qs) + irq_ptr->qib.osliba = + (unsigned long)(irq_ptr->output_qs[0]->slib); + memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8); +} + +int qdio_setup_irq(struct qdio_initialize *init_data) +{ + struct ciw *ciw; + struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data; + + memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib)); + memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag)); + memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw)); + memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc)); + memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat)); + + irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL; + irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0; + + /* wipes qib.ac, required by ar7063 */ + memset(irq_ptr->qdr, 0, sizeof(struct qdr)); + + irq_ptr->int_parm = init_data->int_parm; + irq_ptr->nr_input_qs = init_data->no_input_qs; + irq_ptr->nr_output_qs = init_data->no_output_qs; + irq_ptr->cdev = init_data->cdev; + ccw_device_get_schid(irq_ptr->cdev, &irq_ptr->schid); + setup_queues(irq_ptr, init_data); + + setup_qib(irq_ptr, init_data); + set_impl_params(irq_ptr, init_data->qib_param_field_format, + init_data->qib_param_field, + init_data->input_slib_elements, + init_data->output_slib_elements); + + /* fill input and output descriptors */ + setup_qdr(irq_ptr, init_data); + + /* qdr, qib, sls, slsbs, slibs, sbales are filled now */ + + /* get qdio commands */ + ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE); + if (!ciw) { + DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no); + return -EINVAL; + } + irq_ptr->equeue = *ciw; + + ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE); + if (!ciw) { + DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no); + return -EINVAL; + } + irq_ptr->aqueue = *ciw; + + /* set new interrupt handler */ + spin_lock_irq(get_ccwdev_lock(irq_ptr->cdev)); + irq_ptr->orig_handler = init_data->cdev->handler; + init_data->cdev->handler = qdio_int_handler; + spin_unlock_irq(get_ccwdev_lock(irq_ptr->cdev)); + return 0; +} + +void qdio_print_subchannel_info(struct qdio_irq *irq_ptr, + struct ccw_device *cdev) +{ + char s[80]; + + snprintf(s, 80, "qdio: %s %s on SC %x using " + "AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s%s%s\n", + dev_name(&cdev->dev), + (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" : + ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"), + irq_ptr->schid.sch_no, + is_thinint_irq(irq_ptr), + (irq_ptr->sch_token) ? 1 : 0, + (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0, + css_general_characteristics.aif_tdd, + (irq_ptr->siga_flag.input) ? "R" : " ", + (irq_ptr->siga_flag.output) ? "W" : " ", + (irq_ptr->siga_flag.sync) ? "S" : " ", + (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ", + (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " "); + printk(KERN_INFO "%s", s); +} + +int qdio_enable_async_operation(struct qdio_output_q *outq) +{ + outq->aobs = kcalloc(QDIO_MAX_BUFFERS_PER_Q, sizeof(struct qaob *), + GFP_ATOMIC); + if (!outq->aobs) { + outq->use_cq = 0; + return -ENOMEM; + } + outq->use_cq = 1; + return 0; +} + +void qdio_disable_async_operation(struct qdio_output_q *q) +{ + kfree(q->aobs); + q->aobs = NULL; + q->use_cq = 0; +} + +int __init qdio_setup_init(void) +{ + int rc; + + qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q), + 256, 0, NULL); + if (!qdio_q_cache) + return -ENOMEM; + + qdio_aob_cache = kmem_cache_create("qdio_aob", + sizeof(struct qaob), + sizeof(struct qaob), + 0, + NULL); + if (!qdio_aob_cache) { + rc = -ENOMEM; + goto free_qdio_q_cache; + } + + /* Check for OSA/FCP thin interrupts (bit 67). */ + DBF_EVENT("thinint:%1d", + (css_general_characteristics.aif_osa) ? 1 : 0); + + /* Check for QEBSM support in general (bit 58). */ + DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0); + rc = 0; +out: + return rc; +free_qdio_q_cache: + kmem_cache_destroy(qdio_q_cache); + goto out; +} + +void qdio_setup_exit(void) +{ + kmem_cache_destroy(qdio_aob_cache); + kmem_cache_destroy(qdio_q_cache); +} diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c new file mode 100644 index 000000000..e6b22a581 --- /dev/null +++ b/drivers/s390/cio/qdio_thinint.c @@ -0,0 +1,299 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2000, 2009 + * Author(s): Utz Bacher + * Cornelia Huck + * Jan Glauber + */ +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "cio.h" +#include "ioasm.h" +#include "qdio.h" +#include "qdio_debug.h" + +/* + * Restriction: only 63 iqdio subchannels would have its own indicator, + * after that, subsequent subchannels share one indicator + */ +#define TIQDIO_NR_NONSHARED_IND 63 +#define TIQDIO_NR_INDICATORS (TIQDIO_NR_NONSHARED_IND + 1) +#define TIQDIO_SHARED_IND 63 + +/* device state change indicators */ +struct indicator_t { + u32 ind; /* u32 because of compare-and-swap performance */ + atomic_t count; /* use count, 0 or 1 for non-shared indicators */ +}; + +/* list of thin interrupt input queues */ +static LIST_HEAD(tiq_list); +static DEFINE_MUTEX(tiq_list_lock); + +/* Adapter interrupt definitions */ +static void tiqdio_thinint_handler(struct airq_struct *airq); + +static struct airq_struct tiqdio_airq = { + .handler = tiqdio_thinint_handler, + .isc = QDIO_AIRQ_ISC, +}; + +static struct indicator_t *q_indicators; + +u64 last_ai_time; + +/* returns addr for the device state change indicator */ +static u32 *get_indicator(void) +{ + int i; + + for (i = 0; i < TIQDIO_NR_NONSHARED_IND; i++) + if (!atomic_cmpxchg(&q_indicators[i].count, 0, 1)) + return &q_indicators[i].ind; + + /* use the shared indicator */ + atomic_inc(&q_indicators[TIQDIO_SHARED_IND].count); + return &q_indicators[TIQDIO_SHARED_IND].ind; +} + +static void put_indicator(u32 *addr) +{ + struct indicator_t *ind = container_of(addr, struct indicator_t, ind); + + if (!addr) + return; + atomic_dec(&ind->count); +} + +void tiqdio_add_input_queues(struct qdio_irq *irq_ptr) +{ + mutex_lock(&tiq_list_lock); + list_add_rcu(&irq_ptr->input_qs[0]->entry, &tiq_list); + mutex_unlock(&tiq_list_lock); +} + +void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr) +{ + struct qdio_q *q; + + q = irq_ptr->input_qs[0]; + if (!q) + return; + + mutex_lock(&tiq_list_lock); + list_del_rcu(&q->entry); + mutex_unlock(&tiq_list_lock); + synchronize_rcu(); + INIT_LIST_HEAD(&q->entry); +} + +static inline int has_multiple_inq_on_dsci(struct qdio_irq *irq_ptr) +{ + return irq_ptr->nr_input_qs > 1; +} + +static inline int references_shared_dsci(struct qdio_irq *irq_ptr) +{ + return irq_ptr->dsci == &q_indicators[TIQDIO_SHARED_IND].ind; +} + +static inline int shared_ind(struct qdio_irq *irq_ptr) +{ + return references_shared_dsci(irq_ptr) || + has_multiple_inq_on_dsci(irq_ptr); +} + +void clear_nonshared_ind(struct qdio_irq *irq_ptr) +{ + if (!is_thinint_irq(irq_ptr)) + return; + if (shared_ind(irq_ptr)) + return; + xchg(irq_ptr->dsci, 0); +} + +int test_nonshared_ind(struct qdio_irq *irq_ptr) +{ + if (!is_thinint_irq(irq_ptr)) + return 0; + if (shared_ind(irq_ptr)) + return 0; + if (*irq_ptr->dsci) + return 1; + else + return 0; +} + +static inline u32 clear_shared_ind(void) +{ + if (!atomic_read(&q_indicators[TIQDIO_SHARED_IND].count)) + return 0; + return xchg(&q_indicators[TIQDIO_SHARED_IND].ind, 0); +} + +static inline void tiqdio_call_inq_handlers(struct qdio_irq *irq) +{ + struct qdio_q *q; + int i; + + if (!references_shared_dsci(irq) && + has_multiple_inq_on_dsci(irq)) + xchg(irq->dsci, 0); + + for_each_input_queue(irq, q, i) { + if (q->u.in.queue_start_poll) { + /* skip if polling is enabled or already in work */ + if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, + &q->u.in.queue_irq_state)) { + qperf_inc(q, int_discarded); + continue; + } + + /* avoid dsci clear here, done after processing */ + q->u.in.queue_start_poll(irq->cdev, q->nr, + irq->int_parm); + } else { + if (!shared_ind(irq)) + xchg(irq->dsci, 0); + + /* + * Call inbound processing but not directly + * since that could starve other thinint queues. + */ + tasklet_schedule(&q->tasklet); + } + } +} + +/** + * tiqdio_thinint_handler - thin interrupt handler for qdio + * @airq: pointer to adapter interrupt descriptor + */ +static void tiqdio_thinint_handler(struct airq_struct *airq) +{ + u32 si_used = clear_shared_ind(); + struct qdio_q *q; + + last_ai_time = S390_lowcore.int_clock; + inc_irq_stat(IRQIO_QAI); + + /* protect tiq_list entries, only changed in activate or shutdown */ + rcu_read_lock(); + + /* check for work on all inbound thinint queues */ + list_for_each_entry_rcu(q, &tiq_list, entry) { + struct qdio_irq *irq; + + /* only process queues from changed sets */ + irq = q->irq_ptr; + if (unlikely(references_shared_dsci(irq))) { + if (!si_used) + continue; + } else if (!*irq->dsci) + continue; + + tiqdio_call_inq_handlers(irq); + + qperf_inc(q, adapter_int); + } + rcu_read_unlock(); +} + +static int set_subchannel_ind(struct qdio_irq *irq_ptr, int reset) +{ + struct chsc_scssc_area *scssc = (void *)irq_ptr->chsc_page; + u64 summary_indicator_addr, subchannel_indicator_addr; + int rc; + + if (reset) { + summary_indicator_addr = 0; + subchannel_indicator_addr = 0; + } else { + summary_indicator_addr = virt_to_phys(tiqdio_airq.lsi_ptr); + subchannel_indicator_addr = virt_to_phys(irq_ptr->dsci); + } + + rc = chsc_sadc(irq_ptr->schid, scssc, summary_indicator_addr, + subchannel_indicator_addr); + if (rc) { + DBF_ERROR("%4x SSI r:%4x", irq_ptr->schid.sch_no, + scssc->response.code); + goto out; + } + + DBF_EVENT("setscind"); + DBF_HEX(&summary_indicator_addr, sizeof(summary_indicator_addr)); + DBF_HEX(&subchannel_indicator_addr, sizeof(subchannel_indicator_addr)); +out: + return rc; +} + +/* allocate non-shared indicators and shared indicator */ +int __init tiqdio_allocate_memory(void) +{ + q_indicators = kcalloc(TIQDIO_NR_INDICATORS, + sizeof(struct indicator_t), + GFP_KERNEL); + if (!q_indicators) + return -ENOMEM; + return 0; +} + +void tiqdio_free_memory(void) +{ + kfree(q_indicators); +} + +int __init tiqdio_register_thinints(void) +{ + int rc; + + rc = register_adapter_interrupt(&tiqdio_airq); + if (rc) { + DBF_EVENT("RTI:%x", rc); + return rc; + } + return 0; +} + +int qdio_establish_thinint(struct qdio_irq *irq_ptr) +{ + int rc; + + if (!is_thinint_irq(irq_ptr)) + return 0; + + irq_ptr->dsci = get_indicator(); + DBF_HEX(&irq_ptr->dsci, sizeof(void *)); + + rc = set_subchannel_ind(irq_ptr, 0); + if (rc) + put_indicator(irq_ptr->dsci); + + return rc; +} + +void qdio_shutdown_thinint(struct qdio_irq *irq_ptr) +{ + if (!is_thinint_irq(irq_ptr)) + return; + + /* reset adapter interrupt indicators */ + set_subchannel_ind(irq_ptr, 1); + put_indicator(irq_ptr->dsci); +} + +void __exit tiqdio_unregister_thinints(void) +{ + WARN_ON(!list_empty(&tiq_list)); + unregister_adapter_interrupt(&tiqdio_airq); +} diff --git a/drivers/s390/cio/scm.c b/drivers/s390/cio/scm.c new file mode 100644 index 000000000..6bca1d545 --- /dev/null +++ b/drivers/s390/cio/scm.c @@ -0,0 +1,289 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Recognize and maintain s390 storage class memory. + * + * Copyright IBM Corp. 2012 + * Author(s): Sebastian Ott + */ + +#include +#include +#include +#include +#include +#include +#include +#include "chsc.h" + +static struct device *scm_root; + +#define to_scm_dev(n) container_of(n, struct scm_device, dev) +#define to_scm_drv(d) container_of(d, struct scm_driver, drv) + +static int scmdev_probe(struct device *dev) +{ + struct scm_device *scmdev = to_scm_dev(dev); + struct scm_driver *scmdrv = to_scm_drv(dev->driver); + + return scmdrv->probe ? scmdrv->probe(scmdev) : -ENODEV; +} + +static int scmdev_remove(struct device *dev) +{ + struct scm_device *scmdev = to_scm_dev(dev); + struct scm_driver *scmdrv = to_scm_drv(dev->driver); + + return scmdrv->remove ? scmdrv->remove(scmdev) : -ENODEV; +} + +static int scmdev_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + return add_uevent_var(env, "MODALIAS=scm:scmdev"); +} + +static struct bus_type scm_bus_type = { + .name = "scm", + .probe = scmdev_probe, + .remove = scmdev_remove, + .uevent = scmdev_uevent, +}; + +/** + * scm_driver_register() - register a scm driver + * @scmdrv: driver to be registered + */ +int scm_driver_register(struct scm_driver *scmdrv) +{ + struct device_driver *drv = &scmdrv->drv; + + drv->bus = &scm_bus_type; + + return driver_register(drv); +} +EXPORT_SYMBOL_GPL(scm_driver_register); + +/** + * scm_driver_unregister() - deregister a scm driver + * @scmdrv: driver to be deregistered + */ +void scm_driver_unregister(struct scm_driver *scmdrv) +{ + driver_unregister(&scmdrv->drv); +} +EXPORT_SYMBOL_GPL(scm_driver_unregister); + +void scm_irq_handler(struct aob *aob, blk_status_t error) +{ + struct aob_rq_header *aobrq = (void *) aob->request.data; + struct scm_device *scmdev = aobrq->scmdev; + struct scm_driver *scmdrv = to_scm_drv(scmdev->dev.driver); + + scmdrv->handler(scmdev, aobrq->data, error); +} +EXPORT_SYMBOL_GPL(scm_irq_handler); + +#define scm_attr(name) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct scm_device *scmdev = to_scm_dev(dev); \ + int ret; \ + \ + device_lock(dev); \ + ret = sprintf(buf, "%u\n", scmdev->attrs.name); \ + device_unlock(dev); \ + \ + return ret; \ +} \ +static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); + +scm_attr(persistence); +scm_attr(oper_state); +scm_attr(data_state); +scm_attr(rank); +scm_attr(release); +scm_attr(res_id); + +static struct attribute *scmdev_attrs[] = { + &dev_attr_persistence.attr, + &dev_attr_oper_state.attr, + &dev_attr_data_state.attr, + &dev_attr_rank.attr, + &dev_attr_release.attr, + &dev_attr_res_id.attr, + NULL, +}; + +static struct attribute_group scmdev_attr_group = { + .attrs = scmdev_attrs, +}; + +static const struct attribute_group *scmdev_attr_groups[] = { + &scmdev_attr_group, + NULL, +}; + +static void scmdev_release(struct device *dev) +{ + struct scm_device *scmdev = to_scm_dev(dev); + + kfree(scmdev); +} + +static void scmdev_setup(struct scm_device *scmdev, struct sale *sale, + unsigned int size, unsigned int max_blk_count) +{ + dev_set_name(&scmdev->dev, "%016llx", (unsigned long long) sale->sa); + scmdev->nr_max_block = max_blk_count; + scmdev->address = sale->sa; + scmdev->size = 1UL << size; + scmdev->attrs.rank = sale->rank; + scmdev->attrs.persistence = sale->p; + scmdev->attrs.oper_state = sale->op_state; + scmdev->attrs.data_state = sale->data_state; + scmdev->attrs.rank = sale->rank; + scmdev->attrs.release = sale->r; + scmdev->attrs.res_id = sale->rid; + scmdev->dev.parent = scm_root; + scmdev->dev.bus = &scm_bus_type; + scmdev->dev.release = scmdev_release; + scmdev->dev.groups = scmdev_attr_groups; +} + +/* + * Check for state-changes, notify the driver and userspace. + */ +static void scmdev_update(struct scm_device *scmdev, struct sale *sale) +{ + struct scm_driver *scmdrv; + bool changed; + + device_lock(&scmdev->dev); + changed = scmdev->attrs.rank != sale->rank || + scmdev->attrs.oper_state != sale->op_state; + scmdev->attrs.rank = sale->rank; + scmdev->attrs.oper_state = sale->op_state; + if (!scmdev->dev.driver) + goto out; + scmdrv = to_scm_drv(scmdev->dev.driver); + if (changed && scmdrv->notify) + scmdrv->notify(scmdev, SCM_CHANGE); +out: + device_unlock(&scmdev->dev); + if (changed) + kobject_uevent(&scmdev->dev.kobj, KOBJ_CHANGE); +} + +static int check_address(struct device *dev, void *data) +{ + struct scm_device *scmdev = to_scm_dev(dev); + struct sale *sale = data; + + return scmdev->address == sale->sa; +} + +static struct scm_device *scmdev_find(struct sale *sale) +{ + struct device *dev; + + dev = bus_find_device(&scm_bus_type, NULL, sale, check_address); + + return dev ? to_scm_dev(dev) : NULL; +} + +static int scm_add(struct chsc_scm_info *scm_info, size_t num) +{ + struct sale *sale, *scmal = scm_info->scmal; + struct scm_device *scmdev; + int ret; + + for (sale = scmal; sale < scmal + num; sale++) { + scmdev = scmdev_find(sale); + if (scmdev) { + scmdev_update(scmdev, sale); + /* Release reference from scm_find(). */ + put_device(&scmdev->dev); + continue; + } + scmdev = kzalloc(sizeof(*scmdev), GFP_KERNEL); + if (!scmdev) + return -ENODEV; + scmdev_setup(scmdev, sale, scm_info->is, scm_info->mbc); + ret = device_register(&scmdev->dev); + if (ret) { + /* Release reference from device_initialize(). */ + put_device(&scmdev->dev); + return ret; + } + } + + return 0; +} + +int scm_update_information(void) +{ + struct chsc_scm_info *scm_info; + u64 token = 0; + size_t num; + int ret; + + scm_info = (void *)__get_free_page(GFP_KERNEL | GFP_DMA); + if (!scm_info) + return -ENOMEM; + + do { + ret = chsc_scm_info(scm_info, token); + if (ret) + break; + + num = (scm_info->response.length - + (offsetof(struct chsc_scm_info, scmal) - + offsetof(struct chsc_scm_info, response)) + ) / sizeof(struct sale); + + ret = scm_add(scm_info, num); + if (ret) + break; + + token = scm_info->restok; + } while (token); + + free_page((unsigned long)scm_info); + + return ret; +} + +static int scm_dev_avail(struct device *dev, void *unused) +{ + struct scm_driver *scmdrv = to_scm_drv(dev->driver); + struct scm_device *scmdev = to_scm_dev(dev); + + if (dev->driver && scmdrv->notify) + scmdrv->notify(scmdev, SCM_AVAIL); + + return 0; +} + +int scm_process_availability_information(void) +{ + return bus_for_each_dev(&scm_bus_type, NULL, NULL, scm_dev_avail); +} + +static int __init scm_init(void) +{ + int ret; + + ret = bus_register(&scm_bus_type); + if (ret) + return ret; + + scm_root = root_device_register("scm"); + if (IS_ERR(scm_root)) { + bus_unregister(&scm_bus_type); + return PTR_ERR(scm_root); + } + + scm_update_information(); + return 0; +} +subsys_initcall_sync(scm_init); diff --git a/drivers/s390/cio/trace.c b/drivers/s390/cio/trace.c new file mode 100644 index 000000000..e331cd97e --- /dev/null +++ b/drivers/s390/cio/trace.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Tracepoint definitions for s390_cio + * + * Copyright IBM Corp. 2015 + * Author(s): Peter Oberparleiter + */ + +#include +#include "cio.h" + +#define CREATE_TRACE_POINTS +#include "trace.h" + +EXPORT_TRACEPOINT_SYMBOL(s390_cio_stsch); +EXPORT_TRACEPOINT_SYMBOL(s390_cio_msch); +EXPORT_TRACEPOINT_SYMBOL(s390_cio_tsch); +EXPORT_TRACEPOINT_SYMBOL(s390_cio_tpi); +EXPORT_TRACEPOINT_SYMBOL(s390_cio_ssch); +EXPORT_TRACEPOINT_SYMBOL(s390_cio_csch); +EXPORT_TRACEPOINT_SYMBOL(s390_cio_hsch); +EXPORT_TRACEPOINT_SYMBOL(s390_cio_xsch); +EXPORT_TRACEPOINT_SYMBOL(s390_cio_rsch); +EXPORT_TRACEPOINT_SYMBOL(s390_cio_rchp); +EXPORT_TRACEPOINT_SYMBOL(s390_cio_chsc); diff --git a/drivers/s390/cio/trace.h b/drivers/s390/cio/trace.h new file mode 100644 index 000000000..0ebb29b6f --- /dev/null +++ b/drivers/s390/cio/trace.h @@ -0,0 +1,426 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Tracepoint header for the s390 Common I/O layer (CIO) + * + * Copyright IBM Corp. 2015 + * Author(s): Peter Oberparleiter + */ + +#include +#include +#include +#include +#include "cio.h" +#include "orb.h" + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM s390 + +#if !defined(_TRACE_S390_CIO_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_S390_CIO_H + +#include + +DECLARE_EVENT_CLASS(s390_class_schib, + TP_PROTO(struct subchannel_id schid, struct schib *schib, int cc), + TP_ARGS(schid, schib, cc), + TP_STRUCT__entry( + __field(u8, cssid) + __field(u8, ssid) + __field(u16, schno) + __field(u16, devno) + __field_struct(struct schib, schib) + __field(u8, pmcw_ena) + __field(u8, pmcw_st) + __field(u8, pmcw_dnv) + __field(u16, pmcw_dev) + __field(u8, pmcw_lpm) + __field(u8, pmcw_pnom) + __field(u8, pmcw_lpum) + __field(u8, pmcw_pim) + __field(u8, pmcw_pam) + __field(u8, pmcw_pom) + __field(u64, pmcw_chpid) + __field(int, cc) + ), + TP_fast_assign( + __entry->cssid = schid.cssid; + __entry->ssid = schid.ssid; + __entry->schno = schid.sch_no; + __entry->devno = schib->pmcw.dev; + __entry->schib = *schib; + __entry->pmcw_ena = schib->pmcw.ena; + __entry->pmcw_st = schib->pmcw.ena; + __entry->pmcw_dnv = schib->pmcw.dnv; + __entry->pmcw_dev = schib->pmcw.dev; + __entry->pmcw_lpm = schib->pmcw.lpm; + __entry->pmcw_pnom = schib->pmcw.pnom; + __entry->pmcw_lpum = schib->pmcw.lpum; + __entry->pmcw_pim = schib->pmcw.pim; + __entry->pmcw_pam = schib->pmcw.pam; + __entry->pmcw_pom = schib->pmcw.pom; + memcpy(&__entry->pmcw_chpid, &schib->pmcw.chpid, 8); + __entry->cc = cc; + ), + TP_printk("schid=%x.%x.%04x cc=%d ena=%d st=%d dnv=%d dev=%04x " + "lpm=0x%02x pnom=0x%02x lpum=0x%02x pim=0x%02x pam=0x%02x " + "pom=0x%02x chpids=%016llx", + __entry->cssid, __entry->ssid, __entry->schno, __entry->cc, + __entry->pmcw_ena, __entry->pmcw_st, + __entry->pmcw_dnv, __entry->pmcw_dev, + __entry->pmcw_lpm, __entry->pmcw_pnom, + __entry->pmcw_lpum, __entry->pmcw_pim, + __entry->pmcw_pam, __entry->pmcw_pom, + __entry->pmcw_chpid + ) +); + +/** + * s390_cio_stsch - Store Subchannel instruction (STSCH) was performed + * @schid: Subchannel ID + * @schib: Subchannel-Information block + * @cc: Condition code + */ +DEFINE_EVENT(s390_class_schib, s390_cio_stsch, + TP_PROTO(struct subchannel_id schid, struct schib *schib, int cc), + TP_ARGS(schid, schib, cc) +); + +/** + * s390_cio_msch - Modify Subchannel instruction (MSCH) was performed + * @schid: Subchannel ID + * @schib: Subchannel-Information block + * @cc: Condition code + */ +DEFINE_EVENT(s390_class_schib, s390_cio_msch, + TP_PROTO(struct subchannel_id schid, struct schib *schib, int cc), + TP_ARGS(schid, schib, cc) +); + +/** + * s390_cio_tsch - Test Subchannel instruction (TSCH) was performed + * @schid: Subchannel ID + * @irb: Interruption-Response Block + * @cc: Condition code + */ +TRACE_EVENT(s390_cio_tsch, + TP_PROTO(struct subchannel_id schid, struct irb *irb, int cc), + TP_ARGS(schid, irb, cc), + TP_STRUCT__entry( + __field(u8, cssid) + __field(u8, ssid) + __field(u16, schno) + __field_struct(struct irb, irb) + __field(u8, scsw_dcc) + __field(u8, scsw_pno) + __field(u8, scsw_fctl) + __field(u8, scsw_actl) + __field(u8, scsw_stctl) + __field(u8, scsw_dstat) + __field(u8, scsw_cstat) + __field(int, cc) + ), + TP_fast_assign( + __entry->cssid = schid.cssid; + __entry->ssid = schid.ssid; + __entry->schno = schid.sch_no; + __entry->irb = *irb; + __entry->scsw_dcc = scsw_cc(&irb->scsw); + __entry->scsw_pno = scsw_pno(&irb->scsw); + __entry->scsw_fctl = scsw_fctl(&irb->scsw); + __entry->scsw_actl = scsw_actl(&irb->scsw); + __entry->scsw_stctl = scsw_stctl(&irb->scsw); + __entry->scsw_dstat = scsw_dstat(&irb->scsw); + __entry->scsw_cstat = scsw_cstat(&irb->scsw); + __entry->cc = cc; + ), + TP_printk("schid=%x.%x.%04x cc=%d dcc=%d pno=%d fctl=0x%x actl=0x%x " + "stctl=0x%x dstat=0x%x cstat=0x%x", + __entry->cssid, __entry->ssid, __entry->schno, __entry->cc, + __entry->scsw_dcc, __entry->scsw_pno, + __entry->scsw_fctl, __entry->scsw_actl, + __entry->scsw_stctl, + __entry->scsw_dstat, __entry->scsw_cstat + ) +); + +/** + * s390_cio_tpi - Test Pending Interruption instruction (TPI) was performed + * @addr: Address of the I/O interruption code or %NULL + * @cc: Condition code + */ +TRACE_EVENT(s390_cio_tpi, + TP_PROTO(struct tpi_info *addr, int cc), + TP_ARGS(addr, cc), + TP_STRUCT__entry( + __field(int, cc) + __field_struct(struct tpi_info, tpi_info) + __field(u8, cssid) + __field(u8, ssid) + __field(u16, schno) + __field(u8, adapter_IO) + __field(u8, isc) + __field(u8, type) + ), + TP_fast_assign( + __entry->cc = cc; + if (cc != 0) + memset(&__entry->tpi_info, 0, sizeof(struct tpi_info)); + else if (addr) + __entry->tpi_info = *addr; + else { + memcpy(&__entry->tpi_info, &S390_lowcore.subchannel_id, + sizeof(struct tpi_info)); + } + __entry->cssid = __entry->tpi_info.schid.cssid; + __entry->ssid = __entry->tpi_info.schid.ssid; + __entry->schno = __entry->tpi_info.schid.sch_no; + __entry->adapter_IO = __entry->tpi_info.adapter_IO; + __entry->isc = __entry->tpi_info.isc; + __entry->type = __entry->tpi_info.type; + ), + TP_printk("schid=%x.%x.%04x cc=%d a=%d isc=%d type=%d", + __entry->cssid, __entry->ssid, __entry->schno, __entry->cc, + __entry->adapter_IO, __entry->isc, + __entry->type + ) +); + +/** + * s390_cio_ssch - Start Subchannel instruction (SSCH) was performed + * @schid: Subchannel ID + * @orb: Operation-Request Block + * @cc: Condition code + */ +TRACE_EVENT(s390_cio_ssch, + TP_PROTO(struct subchannel_id schid, union orb *orb, int cc), + TP_ARGS(schid, orb, cc), + TP_STRUCT__entry( + __field(u8, cssid) + __field(u8, ssid) + __field(u16, schno) + __field_struct(union orb, orb) + __field(int, cc) + ), + TP_fast_assign( + __entry->cssid = schid.cssid; + __entry->ssid = schid.ssid; + __entry->schno = schid.sch_no; + __entry->orb = *orb; + __entry->cc = cc; + ), + TP_printk("schid=%x.%x.%04x cc=%d", __entry->cssid, __entry->ssid, + __entry->schno, __entry->cc + ) +); + +DECLARE_EVENT_CLASS(s390_class_schid, + TP_PROTO(struct subchannel_id schid, int cc), + TP_ARGS(schid, cc), + TP_STRUCT__entry( + __field(u8, cssid) + __field(u8, ssid) + __field(u16, schno) + __field(int, cc) + ), + TP_fast_assign( + __entry->cssid = schid.cssid; + __entry->ssid = schid.ssid; + __entry->schno = schid.sch_no; + __entry->cc = cc; + ), + TP_printk("schid=%x.%x.%04x cc=%d", __entry->cssid, __entry->ssid, + __entry->schno, __entry->cc + ) +); + +/** + * s390_cio_csch - Clear Subchannel instruction (CSCH) was performed + * @schid: Subchannel ID + * @cc: Condition code + */ +DEFINE_EVENT(s390_class_schid, s390_cio_csch, + TP_PROTO(struct subchannel_id schid, int cc), + TP_ARGS(schid, cc) +); + +/** + * s390_cio_hsch - Halt Subchannel instruction (HSCH) was performed + * @schid: Subchannel ID + * @cc: Condition code + */ +DEFINE_EVENT(s390_class_schid, s390_cio_hsch, + TP_PROTO(struct subchannel_id schid, int cc), + TP_ARGS(schid, cc) +); + +/** + * s390_cio_xsch - Cancel Subchannel instruction (XSCH) was performed + * @schid: Subchannel ID + * @cc: Condition code + */ +DEFINE_EVENT(s390_class_schid, s390_cio_xsch, + TP_PROTO(struct subchannel_id schid, int cc), + TP_ARGS(schid, cc) +); + +/** + * s390_cio_rsch - Resume Subchannel instruction (RSCH) was performed + * @schid: Subchannel ID + * @cc: Condition code + */ +DEFINE_EVENT(s390_class_schid, s390_cio_rsch, + TP_PROTO(struct subchannel_id schid, int cc), + TP_ARGS(schid, cc) +); + +/** + * s390_cio_rchp - Reset Channel Path (RCHP) instruction was performed + * @chpid: Channel-Path Identifier + * @cc: Condition code + */ +TRACE_EVENT(s390_cio_rchp, + TP_PROTO(struct chp_id chpid, int cc), + TP_ARGS(chpid, cc), + TP_STRUCT__entry( + __field(u8, cssid) + __field(u8, id) + __field(int, cc) + ), + TP_fast_assign( + __entry->cssid = chpid.cssid; + __entry->id = chpid.id; + __entry->cc = cc; + ), + TP_printk("chpid=%x.%02x cc=%d", __entry->cssid, __entry->id, + __entry->cc + ) +); + +#define CHSC_MAX_REQUEST_LEN 64 +#define CHSC_MAX_RESPONSE_LEN 64 + +/** + * s390_cio_chsc - Channel Subsystem Call (CHSC) instruction was performed + * @chsc: CHSC block + * @cc: Condition code + */ +TRACE_EVENT(s390_cio_chsc, + TP_PROTO(struct chsc_header *chsc, int cc), + TP_ARGS(chsc, cc), + TP_STRUCT__entry( + __field(int, cc) + __field(u16, code) + __field(u16, rcode) + __array(u8, request, CHSC_MAX_REQUEST_LEN) + __array(u8, response, CHSC_MAX_RESPONSE_LEN) + ), + TP_fast_assign( + __entry->cc = cc; + __entry->code = chsc->code; + memcpy(&entry->request, chsc, + min_t(u16, chsc->length, CHSC_MAX_REQUEST_LEN)); + chsc = (struct chsc_header *) ((char *) chsc + chsc->length); + __entry->rcode = chsc->code; + memcpy(&entry->response, chsc, + min_t(u16, chsc->length, CHSC_MAX_RESPONSE_LEN)); + ), + TP_printk("code=0x%04x cc=%d rcode=0x%04x", __entry->code, + __entry->cc, __entry->rcode) +); + +/** + * s390_cio_interrupt - An I/O interrupt occurred + * @tpi_info: Address of the I/O interruption code + */ +TRACE_EVENT(s390_cio_interrupt, + TP_PROTO(struct tpi_info *tpi_info), + TP_ARGS(tpi_info), + TP_STRUCT__entry( + __field_struct(struct tpi_info, tpi_info) + __field(u8, cssid) + __field(u8, ssid) + __field(u16, schno) + __field(u8, isc) + __field(u8, type) + ), + TP_fast_assign( + __entry->tpi_info = *tpi_info; + __entry->cssid = tpi_info->schid.cssid; + __entry->ssid = tpi_info->schid.ssid; + __entry->schno = tpi_info->schid.sch_no; + __entry->isc = tpi_info->isc; + __entry->type = tpi_info->type; + ), + TP_printk("schid=%x.%x.%04x isc=%d type=%d", + __entry->cssid, __entry->ssid, __entry->schno, + __entry->isc, __entry->type + ) +); + +/** + * s390_cio_adapter_int - An adapter interrupt occurred + * @tpi_info: Address of the I/O interruption code + */ +TRACE_EVENT(s390_cio_adapter_int, + TP_PROTO(struct tpi_info *tpi_info), + TP_ARGS(tpi_info), + TP_STRUCT__entry( + __field_struct(struct tpi_info, tpi_info) + __field(u8, isc) + ), + TP_fast_assign( + __entry->tpi_info = *tpi_info; + __entry->isc = tpi_info->isc; + ), + TP_printk("isc=%d", __entry->isc) +); + +/** + * s390_cio_stcrw - Store Channel Report Word (STCRW) was performed + * @crw: Channel Report Word + * @cc: Condition code + */ +TRACE_EVENT(s390_cio_stcrw, + TP_PROTO(struct crw *crw, int cc), + TP_ARGS(crw, cc), + TP_STRUCT__entry( + __field_struct(struct crw, crw) + __field(int, cc) + __field(u8, slct) + __field(u8, oflw) + __field(u8, chn) + __field(u8, rsc) + __field(u8, anc) + __field(u8, erc) + __field(u16, rsid) + ), + TP_fast_assign( + __entry->crw = *crw; + __entry->cc = cc; + __entry->slct = crw->slct; + __entry->oflw = crw->oflw; + __entry->chn = crw->chn; + __entry->rsc = crw->rsc; + __entry->anc = crw->anc; + __entry->erc = crw->erc; + __entry->rsid = crw->rsid; + ), + TP_printk("cc=%d slct=%d oflw=%d chn=%d rsc=%d anc=%d erc=0x%x " + "rsid=0x%x", + __entry->cc, __entry->slct, __entry->oflw, + __entry->chn, __entry->rsc, __entry->anc, + __entry->erc, __entry->rsid + ) +); + +#endif /* _TRACE_S390_CIO_H */ + +/* This part must be outside protection */ +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . + +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE trace + +#include diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c new file mode 100644 index 000000000..4fe06ff7b --- /dev/null +++ b/drivers/s390/cio/vfio_ccw_cp.c @@ -0,0 +1,882 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * channel program interfaces + * + * Copyright IBM Corp. 2017 + * + * Author(s): Dong Jia Shi + * Xiao Feng Ren + */ + +#include +#include +#include +#include +#include + +#include "vfio_ccw_cp.h" + +/* + * Max length for ccw chain. + * XXX: Limit to 256, need to check more? + */ +#define CCWCHAIN_LEN_MAX 256 + +struct pfn_array { + /* Starting guest physical I/O address. */ + unsigned long pa_iova; + /* Array that stores PFNs of the pages need to pin. */ + unsigned long *pa_iova_pfn; + /* Array that receives PFNs of the pages pinned. */ + unsigned long *pa_pfn; + /* Number of pages pinned from @pa_iova. */ + int pa_nr; +}; + +struct pfn_array_table { + struct pfn_array *pat_pa; + int pat_nr; +}; + +struct ccwchain { + struct list_head next; + struct ccw1 *ch_ccw; + /* Guest physical address of the current chain. */ + u64 ch_iova; + /* Count of the valid ccws in chain. */ + int ch_len; + /* Pinned PAGEs for the original data. */ + struct pfn_array_table *ch_pat; +}; + +/* + * pfn_array_alloc_pin() - alloc memory for PFNs, then pin user pages in memory + * @pa: pfn_array on which to perform the operation + * @mdev: the mediated device to perform pin/unpin operations + * @iova: target guest physical address + * @len: number of bytes that should be pinned from @iova + * + * Attempt to allocate memory for PFNs, and pin user pages in memory. + * + * Usage of pfn_array: + * We expect (pa_nr == 0) and (pa_iova_pfn == NULL), any field in + * this structure will be filled in by this function. + * + * Returns: + * Number of pages pinned on success. + * If @pa->pa_nr is not 0, or @pa->pa_iova_pfn is not NULL initially, + * returns -EINVAL. + * If no pages were pinned, returns -errno. + */ +static int pfn_array_alloc_pin(struct pfn_array *pa, struct device *mdev, + u64 iova, unsigned int len) +{ + int i, ret = 0; + + if (!len) + return 0; + + if (pa->pa_nr || pa->pa_iova_pfn) + return -EINVAL; + + pa->pa_iova = iova; + + pa->pa_nr = ((iova & ~PAGE_MASK) + len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; + if (!pa->pa_nr) + return -EINVAL; + + pa->pa_iova_pfn = kcalloc(pa->pa_nr, + sizeof(*pa->pa_iova_pfn) + + sizeof(*pa->pa_pfn), + GFP_KERNEL); + if (unlikely(!pa->pa_iova_pfn)) { + pa->pa_nr = 0; + return -ENOMEM; + } + pa->pa_pfn = pa->pa_iova_pfn + pa->pa_nr; + + pa->pa_iova_pfn[0] = pa->pa_iova >> PAGE_SHIFT; + for (i = 1; i < pa->pa_nr; i++) + pa->pa_iova_pfn[i] = pa->pa_iova_pfn[i - 1] + 1; + + ret = vfio_pin_pages(mdev, pa->pa_iova_pfn, pa->pa_nr, + IOMMU_READ | IOMMU_WRITE, pa->pa_pfn); + + if (ret < 0) { + goto err_out; + } else if (ret > 0 && ret != pa->pa_nr) { + vfio_unpin_pages(mdev, pa->pa_iova_pfn, ret); + ret = -EINVAL; + goto err_out; + } + + return ret; + +err_out: + pa->pa_nr = 0; + kfree(pa->pa_iova_pfn); + pa->pa_iova_pfn = NULL; + + return ret; +} + +/* Unpin the pages before releasing the memory. */ +static void pfn_array_unpin_free(struct pfn_array *pa, struct device *mdev) +{ + vfio_unpin_pages(mdev, pa->pa_iova_pfn, pa->pa_nr); + pa->pa_nr = 0; + kfree(pa->pa_iova_pfn); +} + +static int pfn_array_table_init(struct pfn_array_table *pat, int nr) +{ + pat->pat_pa = kcalloc(nr, sizeof(*pat->pat_pa), GFP_KERNEL); + if (unlikely(ZERO_OR_NULL_PTR(pat->pat_pa))) { + pat->pat_nr = 0; + return -ENOMEM; + } + + pat->pat_nr = nr; + + return 0; +} + +static void pfn_array_table_unpin_free(struct pfn_array_table *pat, + struct device *mdev) +{ + int i; + + for (i = 0; i < pat->pat_nr; i++) + pfn_array_unpin_free(pat->pat_pa + i, mdev); + + if (pat->pat_nr) { + kfree(pat->pat_pa); + pat->pat_pa = NULL; + pat->pat_nr = 0; + } +} + +static bool pfn_array_table_iova_pinned(struct pfn_array_table *pat, + unsigned long iova) +{ + struct pfn_array *pa = pat->pat_pa; + unsigned long iova_pfn = iova >> PAGE_SHIFT; + int i, j; + + for (i = 0; i < pat->pat_nr; i++, pa++) + for (j = 0; j < pa->pa_nr; j++) + if (pa->pa_iova_pfn[j] == iova_pfn) + return true; + + return false; +} +/* Create the list idal words for a pfn_array_table. */ +static inline void pfn_array_table_idal_create_words( + struct pfn_array_table *pat, + unsigned long *idaws) +{ + struct pfn_array *pa; + int i, j, k; + + /* + * Idal words (execept the first one) rely on the memory being 4k + * aligned. If a user virtual address is 4K aligned, then it's + * corresponding kernel physical address will also be 4K aligned. Thus + * there will be no problem here to simply use the phys to create an + * idaw. + */ + k = 0; + for (i = 0; i < pat->pat_nr; i++) { + pa = pat->pat_pa + i; + for (j = 0; j < pa->pa_nr; j++) { + idaws[k] = pa->pa_pfn[j] << PAGE_SHIFT; + if (k == 0) + idaws[k] += pa->pa_iova & (PAGE_SIZE - 1); + k++; + } + } +} + + +/* + * Within the domain (@mdev), copy @n bytes from a guest physical + * address (@iova) to a host physical address (@to). + */ +static long copy_from_iova(struct device *mdev, + void *to, u64 iova, + unsigned long n) +{ + struct pfn_array pa = {0}; + u64 from; + int i, ret; + unsigned long l, m; + + ret = pfn_array_alloc_pin(&pa, mdev, iova, n); + if (ret <= 0) + return ret; + + l = n; + for (i = 0; i < pa.pa_nr; i++) { + from = pa.pa_pfn[i] << PAGE_SHIFT; + m = PAGE_SIZE; + if (i == 0) { + from += iova & (PAGE_SIZE - 1); + m -= iova & (PAGE_SIZE - 1); + } + + m = min(l, m); + memcpy(to + (n - l), (void *)from, m); + + l -= m; + if (l == 0) + break; + } + + pfn_array_unpin_free(&pa, mdev); + + return l; +} + +static long copy_ccw_from_iova(struct channel_program *cp, + struct ccw1 *to, u64 iova, + unsigned long len) +{ + struct ccw0 ccw0; + struct ccw1 *pccw1; + int ret; + int i; + + ret = copy_from_iova(cp->mdev, to, iova, len * sizeof(struct ccw1)); + if (ret) + return ret; + + if (!cp->orb.cmd.fmt) { + pccw1 = to; + for (i = 0; i < len; i++) { + ccw0 = *(struct ccw0 *)pccw1; + if ((pccw1->cmd_code & 0x0f) == CCW_CMD_TIC) { + pccw1->cmd_code = CCW_CMD_TIC; + pccw1->flags = 0; + pccw1->count = 0; + } else { + pccw1->cmd_code = ccw0.cmd_code; + pccw1->flags = ccw0.flags; + pccw1->count = ccw0.count; + } + pccw1->cda = ccw0.cda; + pccw1++; + } + } + + return ret; +} + +/* + * Helpers to operate ccwchain. + */ +#define ccw_is_test(_ccw) (((_ccw)->cmd_code & 0x0F) == 0) + +#define ccw_is_noop(_ccw) ((_ccw)->cmd_code == CCW_CMD_NOOP) + +#define ccw_is_tic(_ccw) ((_ccw)->cmd_code == CCW_CMD_TIC) + +#define ccw_is_idal(_ccw) ((_ccw)->flags & CCW_FLAG_IDA) + + +#define ccw_is_chain(_ccw) ((_ccw)->flags & (CCW_FLAG_CC | CCW_FLAG_DC)) + +static struct ccwchain *ccwchain_alloc(struct channel_program *cp, int len) +{ + struct ccwchain *chain; + void *data; + size_t size; + + /* Make ccw address aligned to 8. */ + size = ((sizeof(*chain) + 7L) & -8L) + + sizeof(*chain->ch_ccw) * len + + sizeof(*chain->ch_pat) * len; + chain = kzalloc(size, GFP_DMA | GFP_KERNEL); + if (!chain) + return NULL; + + data = (u8 *)chain + ((sizeof(*chain) + 7L) & -8L); + chain->ch_ccw = (struct ccw1 *)data; + + data = (u8 *)(chain->ch_ccw) + sizeof(*chain->ch_ccw) * len; + chain->ch_pat = (struct pfn_array_table *)data; + + chain->ch_len = len; + + list_add_tail(&chain->next, &cp->ccwchain_list); + + return chain; +} + +static void ccwchain_free(struct ccwchain *chain) +{ + list_del(&chain->next); + kfree(chain); +} + +/* Free resource for a ccw that allocated memory for its cda. */ +static void ccwchain_cda_free(struct ccwchain *chain, int idx) +{ + struct ccw1 *ccw = chain->ch_ccw + idx; + + if (ccw_is_test(ccw) || ccw_is_noop(ccw) || ccw_is_tic(ccw)) + return; + if (!ccw->count) + return; + + kfree((void *)(u64)ccw->cda); +} + +/* Unpin the pages then free the memory resources. */ +static void cp_unpin_free(struct channel_program *cp) +{ + struct ccwchain *chain, *temp; + int i; + + list_for_each_entry_safe(chain, temp, &cp->ccwchain_list, next) { + for (i = 0; i < chain->ch_len; i++) { + pfn_array_table_unpin_free(chain->ch_pat + i, + cp->mdev); + ccwchain_cda_free(chain, i); + } + ccwchain_free(chain); + } +} + +/** + * ccwchain_calc_length - calculate the length of the ccw chain. + * @iova: guest physical address of the target ccw chain + * @cp: channel_program on which to perform the operation + * + * This is the chain length not considering any TICs. + * You need to do a new round for each TIC target. + * + * The program is also validated for absence of not yet supported + * indirect data addressing scenarios. + * + * Returns: the length of the ccw chain or -errno. + */ +static int ccwchain_calc_length(u64 iova, struct channel_program *cp) +{ + struct ccw1 *ccw, *p; + int cnt; + + /* + * Copy current chain from guest to host kernel. + * Currently the chain length is limited to CCWCHAIN_LEN_MAX (256). + * So copying 2K is enough (safe). + */ + p = ccw = kcalloc(CCWCHAIN_LEN_MAX, sizeof(*ccw), GFP_KERNEL); + if (!ccw) + return -ENOMEM; + + cnt = copy_ccw_from_iova(cp, ccw, iova, CCWCHAIN_LEN_MAX); + if (cnt) { + kfree(ccw); + return cnt; + } + + cnt = 0; + do { + cnt++; + + /* + * As we don't want to fail direct addressing even if the + * orb specified one of the unsupported formats, we defer + * checking for IDAWs in unsupported formats to here. + */ + if ((!cp->orb.cmd.c64 || cp->orb.cmd.i2k) && ccw_is_idal(ccw)) { + kfree(p); + return -EOPNOTSUPP; + } + + if ((!ccw_is_chain(ccw)) && (!ccw_is_tic(ccw))) + break; + + ccw++; + } while (cnt < CCWCHAIN_LEN_MAX + 1); + + if (cnt == CCWCHAIN_LEN_MAX + 1) + cnt = -EINVAL; + + kfree(p); + return cnt; +} + +static int tic_target_chain_exists(struct ccw1 *tic, struct channel_program *cp) +{ + struct ccwchain *chain; + u32 ccw_head, ccw_tail; + + list_for_each_entry(chain, &cp->ccwchain_list, next) { + ccw_head = chain->ch_iova; + ccw_tail = ccw_head + (chain->ch_len - 1) * sizeof(struct ccw1); + + if ((ccw_head <= tic->cda) && (tic->cda <= ccw_tail)) + return 1; + } + + return 0; +} + +static int ccwchain_loop_tic(struct ccwchain *chain, + struct channel_program *cp); + +static int ccwchain_handle_tic(struct ccw1 *tic, struct channel_program *cp) +{ + struct ccwchain *chain; + int len, ret; + + /* May transfer to an existing chain. */ + if (tic_target_chain_exists(tic, cp)) + return 0; + + /* Get chain length. */ + len = ccwchain_calc_length(tic->cda, cp); + if (len < 0) + return len; + + /* Need alloc a new chain for this one. */ + chain = ccwchain_alloc(cp, len); + if (!chain) + return -ENOMEM; + chain->ch_iova = tic->cda; + + /* Copy the new chain from user. */ + ret = copy_ccw_from_iova(cp, chain->ch_ccw, tic->cda, len); + if (ret) { + ccwchain_free(chain); + return ret; + } + + /* Loop for tics on this new chain. */ + return ccwchain_loop_tic(chain, cp); +} + +/* Loop for TICs. */ +static int ccwchain_loop_tic(struct ccwchain *chain, struct channel_program *cp) +{ + struct ccw1 *tic; + int i, ret; + + for (i = 0; i < chain->ch_len; i++) { + tic = chain->ch_ccw + i; + + if (!ccw_is_tic(tic)) + continue; + + ret = ccwchain_handle_tic(tic, cp); + if (ret) + return ret; + } + + return 0; +} + +static int ccwchain_fetch_tic(struct ccwchain *chain, + int idx, + struct channel_program *cp) +{ + struct ccw1 *ccw = chain->ch_ccw + idx; + struct ccwchain *iter; + u32 ccw_head, ccw_tail; + + list_for_each_entry(iter, &cp->ccwchain_list, next) { + ccw_head = iter->ch_iova; + ccw_tail = ccw_head + (iter->ch_len - 1) * sizeof(struct ccw1); + + if ((ccw_head <= ccw->cda) && (ccw->cda <= ccw_tail)) { + ccw->cda = (__u32) (addr_t) (((char *)iter->ch_ccw) + + (ccw->cda - ccw_head)); + return 0; + } + } + + return -EFAULT; +} + +static int ccwchain_fetch_direct(struct ccwchain *chain, + int idx, + struct channel_program *cp) +{ + struct ccw1 *ccw; + struct pfn_array_table *pat; + unsigned long *idaws; + int ret; + + ccw = chain->ch_ccw + idx; + + if (!ccw->count) { + /* + * We just want the translation result of any direct ccw + * to be an IDA ccw, so let's add the IDA flag for it. + * Although the flag will be ignored by firmware. + */ + ccw->flags |= CCW_FLAG_IDA; + return 0; + } + + /* + * Pin data page(s) in memory. + * The number of pages actually is the count of the idaws which will be + * needed when translating a direct ccw to a idal ccw. + */ + pat = chain->ch_pat + idx; + ret = pfn_array_table_init(pat, 1); + if (ret) + goto out_init; + + ret = pfn_array_alloc_pin(pat->pat_pa, cp->mdev, ccw->cda, ccw->count); + if (ret < 0) + goto out_unpin; + + /* Translate this direct ccw to a idal ccw. */ + idaws = kcalloc(ret, sizeof(*idaws), GFP_DMA | GFP_KERNEL); + if (!idaws) { + ret = -ENOMEM; + goto out_unpin; + } + ccw->cda = (__u32) virt_to_phys(idaws); + ccw->flags |= CCW_FLAG_IDA; + + pfn_array_table_idal_create_words(pat, idaws); + + return 0; + +out_unpin: + pfn_array_table_unpin_free(pat, cp->mdev); +out_init: + ccw->cda = 0; + return ret; +} + +static int ccwchain_fetch_idal(struct ccwchain *chain, + int idx, + struct channel_program *cp) +{ + struct ccw1 *ccw; + struct pfn_array_table *pat; + unsigned long *idaws; + u64 idaw_iova; + unsigned int idaw_nr, idaw_len; + int i, ret; + + ccw = chain->ch_ccw + idx; + + if (!ccw->count) + return 0; + + /* Calculate size of idaws. */ + ret = copy_from_iova(cp->mdev, &idaw_iova, ccw->cda, sizeof(idaw_iova)); + if (ret) + return ret; + idaw_nr = idal_nr_words((void *)(idaw_iova), ccw->count); + idaw_len = idaw_nr * sizeof(*idaws); + + /* Pin data page(s) in memory. */ + pat = chain->ch_pat + idx; + ret = pfn_array_table_init(pat, idaw_nr); + if (ret) + goto out_init; + + /* Translate idal ccw to use new allocated idaws. */ + idaws = kzalloc(idaw_len, GFP_DMA | GFP_KERNEL); + if (!idaws) { + ret = -ENOMEM; + goto out_unpin; + } + + ret = copy_from_iova(cp->mdev, idaws, ccw->cda, idaw_len); + if (ret) + goto out_free_idaws; + + ccw->cda = virt_to_phys(idaws); + + for (i = 0; i < idaw_nr; i++) { + idaw_iova = *(idaws + i); + + ret = pfn_array_alloc_pin(pat->pat_pa + i, cp->mdev, + idaw_iova, 1); + if (ret < 0) + goto out_free_idaws; + } + + pfn_array_table_idal_create_words(pat, idaws); + + return 0; + +out_free_idaws: + kfree(idaws); +out_unpin: + pfn_array_table_unpin_free(pat, cp->mdev); +out_init: + ccw->cda = 0; + return ret; +} + +/* + * Fetch one ccw. + * To reduce memory copy, we'll pin the cda page in memory, + * and to get rid of the cda 2G limitiaion of ccw1, we'll translate + * direct ccws to idal ccws. + */ +static int ccwchain_fetch_one(struct ccwchain *chain, + int idx, + struct channel_program *cp) +{ + struct ccw1 *ccw = chain->ch_ccw + idx; + + if (ccw_is_test(ccw) || ccw_is_noop(ccw)) + return 0; + + if (ccw_is_tic(ccw)) + return ccwchain_fetch_tic(chain, idx, cp); + + if (ccw_is_idal(ccw)) + return ccwchain_fetch_idal(chain, idx, cp); + + return ccwchain_fetch_direct(chain, idx, cp); +} + +/** + * cp_init() - allocate ccwchains for a channel program. + * @cp: channel_program on which to perform the operation + * @mdev: the mediated device to perform pin/unpin operations + * @orb: control block for the channel program from the guest + * + * This creates one or more ccwchain(s), and copies the raw data of + * the target channel program from @orb->cmd.iova to the new ccwchain(s). + * + * Limitations: + * 1. Supports only prefetch enabled mode. + * 2. Supports idal(c64) ccw chaining. + * 3. Supports 4k idaw. + * + * Returns: + * %0 on success and a negative error value on failure. + */ +int cp_init(struct channel_program *cp, struct device *mdev, union orb *orb) +{ + u64 iova = orb->cmd.cpa; + struct ccwchain *chain; + int len, ret; + + /* + * XXX: + * Only support prefetch enable mode now. + */ + if (!orb->cmd.pfch) + return -EOPNOTSUPP; + + INIT_LIST_HEAD(&cp->ccwchain_list); + memcpy(&cp->orb, orb, sizeof(*orb)); + cp->mdev = mdev; + + /* Get chain length. */ + len = ccwchain_calc_length(iova, cp); + if (len < 0) + return len; + + /* Alloc mem for the head chain. */ + chain = ccwchain_alloc(cp, len); + if (!chain) + return -ENOMEM; + chain->ch_iova = iova; + + /* Copy the head chain from guest. */ + ret = copy_ccw_from_iova(cp, chain->ch_ccw, iova, len); + if (ret) { + ccwchain_free(chain); + return ret; + } + + /* Now loop for its TICs. */ + ret = ccwchain_loop_tic(chain, cp); + if (ret) + cp_unpin_free(cp); + /* It is safe to force: if not set but idals used + * ccwchain_calc_length returns an error. + */ + cp->orb.cmd.c64 = 1; + + return ret; +} + + +/** + * cp_free() - free resources for channel program. + * @cp: channel_program on which to perform the operation + * + * This unpins the memory pages and frees the memory space occupied by + * @cp, which must have been returned by a previous call to cp_init(). + * Otherwise, undefined behavior occurs. + */ +void cp_free(struct channel_program *cp) +{ + cp_unpin_free(cp); +} + +/** + * cp_prefetch() - translate a guest physical address channel program to + * a real-device runnable channel program. + * @cp: channel_program on which to perform the operation + * + * This function translates the guest-physical-address channel program + * and stores the result to ccwchain list. @cp must have been + * initialized by a previous call with cp_init(). Otherwise, undefined + * behavior occurs. + * For each chain composing the channel program: + * - On entry ch_len holds the count of CCWs to be translated. + * - On exit ch_len is adjusted to the count of successfully translated CCWs. + * This allows cp_free to find in ch_len the count of CCWs to free in a chain. + * + * The S/390 CCW Translation APIS (prefixed by 'cp_') are introduced + * as helpers to do ccw chain translation inside the kernel. Basically + * they accept a channel program issued by a virtual machine, and + * translate the channel program to a real-device runnable channel + * program. + * + * These APIs will copy the ccws into kernel-space buffers, and update + * the guest phsical addresses with their corresponding host physical + * addresses. Then channel I/O device drivers could issue the + * translated channel program to real devices to perform an I/O + * operation. + * + * These interfaces are designed to support translation only for + * channel programs, which are generated and formatted by a + * guest. Thus this will make it possible for things like VFIO to + * leverage the interfaces to passthrough a channel I/O mediated + * device in QEMU. + * + * We support direct ccw chaining by translating them to idal ccws. + * + * Returns: + * %0 on success and a negative error value on failure. + */ +int cp_prefetch(struct channel_program *cp) +{ + struct ccwchain *chain; + int len, idx, ret; + + list_for_each_entry(chain, &cp->ccwchain_list, next) { + len = chain->ch_len; + for (idx = 0; idx < len; idx++) { + ret = ccwchain_fetch_one(chain, idx, cp); + if (ret) + goto out_err; + } + } + + return 0; +out_err: + /* Only cleanup the chain elements that were actually translated. */ + chain->ch_len = idx; + list_for_each_entry_continue(chain, &cp->ccwchain_list, next) { + chain->ch_len = 0; + } + return ret; +} + +/** + * cp_get_orb() - get the orb of the channel program + * @cp: channel_program on which to perform the operation + * @intparm: new intparm for the returned orb + * @lpm: candidate value of the logical-path mask for the returned orb + * + * This function returns the address of the updated orb of the channel + * program. Channel I/O device drivers could use this orb to issue a + * ssch. + */ +union orb *cp_get_orb(struct channel_program *cp, u32 intparm, u8 lpm) +{ + union orb *orb; + struct ccwchain *chain; + struct ccw1 *cpa; + + orb = &cp->orb; + + orb->cmd.intparm = intparm; + orb->cmd.fmt = 1; + orb->cmd.key = PAGE_DEFAULT_KEY >> 4; + + if (orb->cmd.lpm == 0) + orb->cmd.lpm = lpm; + + chain = list_first_entry(&cp->ccwchain_list, struct ccwchain, next); + cpa = chain->ch_ccw; + orb->cmd.cpa = (__u32) __pa(cpa); + + return orb; +} + +/** + * cp_update_scsw() - update scsw for a channel program. + * @cp: channel_program on which to perform the operation + * @scsw: I/O results of the channel program and also the target to be + * updated + * + * @scsw contains the I/O results of the channel program that pointed + * to by @cp. However what @scsw->cpa stores is a host physical + * address, which is meaningless for the guest, which is waiting for + * the I/O results. + * + * This function updates @scsw->cpa to its coressponding guest physical + * address. + */ +void cp_update_scsw(struct channel_program *cp, union scsw *scsw) +{ + struct ccwchain *chain; + u32 cpa = scsw->cmd.cpa; + u32 ccw_head, ccw_tail; + + /* + * LATER: + * For now, only update the cmd.cpa part. We may need to deal with + * other portions of the schib as well, even if we don't return them + * in the ioctl directly. Path status changes etc. + */ + list_for_each_entry(chain, &cp->ccwchain_list, next) { + ccw_head = (u32)(u64)chain->ch_ccw; + ccw_tail = (u32)(u64)(chain->ch_ccw + chain->ch_len - 1); + + if ((ccw_head <= cpa) && (cpa <= ccw_tail)) { + /* + * (cpa - ccw_head) is the offset value of the host + * physical ccw to its chain head. + * Adding this value to the guest physical ccw chain + * head gets us the guest cpa. + */ + cpa = chain->ch_iova + (cpa - ccw_head); + break; + } + } + + scsw->cmd.cpa = cpa; +} + +/** + * cp_iova_pinned() - check if an iova is pinned for a ccw chain. + * @cp: channel_program on which to perform the operation + * @iova: the iova to check + * + * If the @iova is currently pinned for the ccw chain, return true; + * else return false. + */ +bool cp_iova_pinned(struct channel_program *cp, u64 iova) +{ + struct ccwchain *chain; + int i; + + list_for_each_entry(chain, &cp->ccwchain_list, next) { + for (i = 0; i < chain->ch_len; i++) + if (pfn_array_table_iova_pinned(chain->ch_pat + i, + iova)) + return true; + } + + return false; +} diff --git a/drivers/s390/cio/vfio_ccw_cp.h b/drivers/s390/cio/vfio_ccw_cp.h new file mode 100644 index 000000000..a4b74fb1a --- /dev/null +++ b/drivers/s390/cio/vfio_ccw_cp.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * channel program interfaces + * + * Copyright IBM Corp. 2017 + * + * Author(s): Dong Jia Shi + * Xiao Feng Ren + */ + +#ifndef _VFIO_CCW_CP_H_ +#define _VFIO_CCW_CP_H_ + +#include +#include + +#include "orb.h" + +/** + * struct channel_program - manage information for channel program + * @ccwchain_list: list head of ccwchains + * @orb: orb for the currently processed ssch request + * @mdev: the mediated device to perform page pinning/unpinning + * + * @ccwchain_list is the head of a ccwchain list, that contents the + * translated result of the guest channel program that pointed out by + * the iova parameter when calling cp_init. + */ +struct channel_program { + struct list_head ccwchain_list; + union orb orb; + struct device *mdev; +}; + +extern int cp_init(struct channel_program *cp, struct device *mdev, + union orb *orb); +extern void cp_free(struct channel_program *cp); +extern int cp_prefetch(struct channel_program *cp); +extern union orb *cp_get_orb(struct channel_program *cp, u32 intparm, u8 lpm); +extern void cp_update_scsw(struct channel_program *cp, union scsw *scsw); +extern bool cp_iova_pinned(struct channel_program *cp, u64 iova); + +#endif diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c new file mode 100644 index 000000000..7a06cdff6 --- /dev/null +++ b/drivers/s390/cio/vfio_ccw_drv.c @@ -0,0 +1,284 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * VFIO based Physical Subchannel device driver + * + * Copyright IBM Corp. 2017 + * + * Author(s): Dong Jia Shi + * Xiao Feng Ren + */ + +#include +#include +#include +#include +#include +#include + +#include + +#include "ioasm.h" +#include "css.h" +#include "vfio_ccw_private.h" + +struct workqueue_struct *vfio_ccw_work_q; +struct kmem_cache *vfio_ccw_io_region; + +/* + * Helpers + */ +int vfio_ccw_sch_quiesce(struct subchannel *sch) +{ + struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev); + DECLARE_COMPLETION_ONSTACK(completion); + int iretry, ret = 0; + + spin_lock_irq(sch->lock); + if (!sch->schib.pmcw.ena) + goto out_unlock; + ret = cio_disable_subchannel(sch); + if (ret != -EBUSY) + goto out_unlock; + + iretry = 255; + do { + + ret = cio_cancel_halt_clear(sch, &iretry); + + if (ret == -EIO) { + pr_err("vfio_ccw: could not quiesce subchannel 0.%x.%04x!\n", + sch->schid.ssid, sch->schid.sch_no); + break; + } + + /* + * Flush all I/O and wait for + * cancel/halt/clear completion. + */ + private->completion = &completion; + spin_unlock_irq(sch->lock); + + if (ret == -EBUSY) + wait_for_completion_timeout(&completion, 3*HZ); + + private->completion = NULL; + flush_workqueue(vfio_ccw_work_q); + spin_lock_irq(sch->lock); + ret = cio_disable_subchannel(sch); + } while (ret == -EBUSY); +out_unlock: + private->state = VFIO_CCW_STATE_NOT_OPER; + spin_unlock_irq(sch->lock); + return ret; +} + +static void vfio_ccw_sch_io_todo(struct work_struct *work) +{ + struct vfio_ccw_private *private; + struct irb *irb; + bool is_final; + + private = container_of(work, struct vfio_ccw_private, io_work); + irb = &private->irb; + + is_final = !(scsw_actl(&irb->scsw) & + (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)); + if (scsw_is_solicited(&irb->scsw)) { + cp_update_scsw(&private->cp, &irb->scsw); + if (is_final) + cp_free(&private->cp); + } + memcpy(private->io_region->irb_area, irb, sizeof(*irb)); + + if (private->io_trigger) + eventfd_signal(private->io_trigger, 1); + + if (private->mdev && is_final) + private->state = VFIO_CCW_STATE_IDLE; +} + +/* + * Css driver callbacks + */ +static void vfio_ccw_sch_irq(struct subchannel *sch) +{ + struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev); + + inc_irq_stat(IRQIO_CIO); + vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_INTERRUPT); +} + +static int vfio_ccw_sch_probe(struct subchannel *sch) +{ + struct pmcw *pmcw = &sch->schib.pmcw; + struct vfio_ccw_private *private; + int ret; + + if (pmcw->qf) { + dev_warn(&sch->dev, "vfio: ccw: does not support QDIO: %s\n", + dev_name(&sch->dev)); + return -ENODEV; + } + + private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); + if (!private) + return -ENOMEM; + + private->io_region = kmem_cache_zalloc(vfio_ccw_io_region, + GFP_KERNEL | GFP_DMA); + if (!private->io_region) { + kfree(private); + return -ENOMEM; + } + + private->sch = sch; + dev_set_drvdata(&sch->dev, private); + + spin_lock_irq(sch->lock); + private->state = VFIO_CCW_STATE_NOT_OPER; + sch->isc = VFIO_CCW_ISC; + ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch); + spin_unlock_irq(sch->lock); + if (ret) + goto out_free; + + ret = vfio_ccw_mdev_reg(sch); + if (ret) + goto out_disable; + + INIT_WORK(&private->io_work, vfio_ccw_sch_io_todo); + atomic_set(&private->avail, 1); + private->state = VFIO_CCW_STATE_STANDBY; + + return 0; + +out_disable: + cio_disable_subchannel(sch); +out_free: + dev_set_drvdata(&sch->dev, NULL); + kmem_cache_free(vfio_ccw_io_region, private->io_region); + kfree(private); + return ret; +} + +static int vfio_ccw_sch_remove(struct subchannel *sch) +{ + struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev); + + vfio_ccw_sch_quiesce(sch); + + vfio_ccw_mdev_unreg(sch); + + dev_set_drvdata(&sch->dev, NULL); + + kmem_cache_free(vfio_ccw_io_region, private->io_region); + kfree(private); + + return 0; +} + +static void vfio_ccw_sch_shutdown(struct subchannel *sch) +{ + vfio_ccw_sch_quiesce(sch); +} + +/** + * vfio_ccw_sch_event - process subchannel event + * @sch: subchannel + * @process: non-zero if function is called in process context + * + * An unspecified event occurred for this subchannel. Adjust data according + * to the current operational state of the subchannel. Return zero when the + * event has been handled sufficiently or -EAGAIN when this function should + * be called again in process context. + */ +static int vfio_ccw_sch_event(struct subchannel *sch, int process) +{ + struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev); + unsigned long flags; + int rc = -EAGAIN; + + spin_lock_irqsave(sch->lock, flags); + if (!device_is_registered(&sch->dev)) + goto out_unlock; + + if (work_pending(&sch->todo_work)) + goto out_unlock; + + if (cio_update_schib(sch)) { + vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER); + rc = 0; + goto out_unlock; + } + + private = dev_get_drvdata(&sch->dev); + if (private->state == VFIO_CCW_STATE_NOT_OPER) { + private->state = private->mdev ? VFIO_CCW_STATE_IDLE : + VFIO_CCW_STATE_STANDBY; + } + rc = 0; + +out_unlock: + spin_unlock_irqrestore(sch->lock, flags); + + return rc; +} + +static struct css_device_id vfio_ccw_sch_ids[] = { + { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, }, + { /* end of list */ }, +}; +MODULE_DEVICE_TABLE(css, vfio_ccw_sch_ids); + +static struct css_driver vfio_ccw_sch_driver = { + .drv = { + .name = "vfio_ccw", + .owner = THIS_MODULE, + }, + .subchannel_type = vfio_ccw_sch_ids, + .irq = vfio_ccw_sch_irq, + .probe = vfio_ccw_sch_probe, + .remove = vfio_ccw_sch_remove, + .shutdown = vfio_ccw_sch_shutdown, + .sch_event = vfio_ccw_sch_event, +}; + +static int __init vfio_ccw_sch_init(void) +{ + int ret; + + vfio_ccw_work_q = create_singlethread_workqueue("vfio-ccw"); + if (!vfio_ccw_work_q) + return -ENOMEM; + + vfio_ccw_io_region = kmem_cache_create_usercopy("vfio_ccw_io_region", + sizeof(struct ccw_io_region), 0, + SLAB_ACCOUNT, 0, + sizeof(struct ccw_io_region), NULL); + if (!vfio_ccw_io_region) { + destroy_workqueue(vfio_ccw_work_q); + return -ENOMEM; + } + + isc_register(VFIO_CCW_ISC); + ret = css_driver_register(&vfio_ccw_sch_driver); + if (ret) { + isc_unregister(VFIO_CCW_ISC); + kmem_cache_destroy(vfio_ccw_io_region); + destroy_workqueue(vfio_ccw_work_q); + } + + return ret; +} + +static void __exit vfio_ccw_sch_exit(void) +{ + css_driver_unregister(&vfio_ccw_sch_driver); + isc_unregister(VFIO_CCW_ISC); + kmem_cache_destroy(vfio_ccw_io_region); + destroy_workqueue(vfio_ccw_work_q); +} +module_init(vfio_ccw_sch_init); +module_exit(vfio_ccw_sch_exit); + +MODULE_LICENSE("GPL v2"); diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c new file mode 100644 index 000000000..f94aa01f9 --- /dev/null +++ b/drivers/s390/cio/vfio_ccw_fsm.c @@ -0,0 +1,229 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Finite state machine for vfio-ccw device handling + * + * Copyright IBM Corp. 2017 + * + * Author(s): Dong Jia Shi + */ + +#include +#include + +#include "ioasm.h" +#include "vfio_ccw_private.h" + +#define CREATE_TRACE_POINTS +#include "vfio_ccw_trace.h" + +static int fsm_io_helper(struct vfio_ccw_private *private) +{ + struct subchannel *sch; + union orb *orb; + int ccode; + __u8 lpm; + unsigned long flags; + int ret; + + sch = private->sch; + + spin_lock_irqsave(sch->lock, flags); + private->state = VFIO_CCW_STATE_BUSY; + + orb = cp_get_orb(&private->cp, (u32)(addr_t)sch, sch->lpm); + + /* Issue "Start Subchannel" */ + ccode = ssch(sch->schid, orb); + + switch (ccode) { + case 0: + /* + * Initialize device status information + */ + sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND; + ret = 0; + break; + case 1: /* Status pending */ + case 2: /* Busy */ + ret = -EBUSY; + break; + case 3: /* Device/path not operational */ + { + lpm = orb->cmd.lpm; + if (lpm != 0) + sch->lpm &= ~lpm; + else + sch->lpm = 0; + + if (cio_update_schib(sch)) + ret = -ENODEV; + else + ret = sch->lpm ? -EACCES : -ENODEV; + break; + } + default: + ret = ccode; + } + spin_unlock_irqrestore(sch->lock, flags); + return ret; +} + +static void fsm_notoper(struct vfio_ccw_private *private, + enum vfio_ccw_event event) +{ + struct subchannel *sch = private->sch; + + /* + * TODO: + * Probably we should send the machine check to the guest. + */ + css_sched_sch_todo(sch, SCH_TODO_UNREG); + private->state = VFIO_CCW_STATE_NOT_OPER; +} + +/* + * No operation action. + */ +static void fsm_nop(struct vfio_ccw_private *private, + enum vfio_ccw_event event) +{ +} + +static void fsm_io_error(struct vfio_ccw_private *private, + enum vfio_ccw_event event) +{ + pr_err("vfio-ccw: FSM: I/O request from state:%d\n", private->state); + private->io_region->ret_code = -EIO; +} + +static void fsm_io_busy(struct vfio_ccw_private *private, + enum vfio_ccw_event event) +{ + private->io_region->ret_code = -EBUSY; +} + +static void fsm_disabled_irq(struct vfio_ccw_private *private, + enum vfio_ccw_event event) +{ + struct subchannel *sch = private->sch; + + /* + * An interrupt in a disabled state means a previous disable was not + * successful - should not happen, but we try to disable again. + */ + cio_disable_subchannel(sch); +} +inline struct subchannel_id get_schid(struct vfio_ccw_private *p) +{ + return p->sch->schid; +} + +/* + * Deal with the ccw command request from the userspace. + */ +static void fsm_io_request(struct vfio_ccw_private *private, + enum vfio_ccw_event event) +{ + union orb *orb; + union scsw *scsw = &private->scsw; + struct ccw_io_region *io_region = private->io_region; + struct mdev_device *mdev = private->mdev; + char *errstr = "request"; + + private->state = VFIO_CCW_STATE_BOXED; + + memcpy(scsw, io_region->scsw_area, sizeof(*scsw)); + + if (scsw->cmd.fctl & SCSW_FCTL_START_FUNC) { + orb = (union orb *)io_region->orb_area; + + /* Don't try to build a cp if transport mode is specified. */ + if (orb->tm.b) { + io_region->ret_code = -EOPNOTSUPP; + errstr = "transport mode"; + goto err_out; + } + io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev), + orb); + if (io_region->ret_code) { + errstr = "cp init"; + goto err_out; + } + + io_region->ret_code = cp_prefetch(&private->cp); + if (io_region->ret_code) { + errstr = "cp prefetch"; + cp_free(&private->cp); + goto err_out; + } + + /* Start channel program and wait for I/O interrupt. */ + io_region->ret_code = fsm_io_helper(private); + if (io_region->ret_code) { + errstr = "cp fsm_io_helper"; + cp_free(&private->cp); + goto err_out; + } + return; + } else if (scsw->cmd.fctl & SCSW_FCTL_HALT_FUNC) { + /* XXX: Handle halt. */ + io_region->ret_code = -EOPNOTSUPP; + goto err_out; + } else if (scsw->cmd.fctl & SCSW_FCTL_CLEAR_FUNC) { + /* XXX: Handle clear. */ + io_region->ret_code = -EOPNOTSUPP; + goto err_out; + } + +err_out: + private->state = VFIO_CCW_STATE_IDLE; + trace_vfio_ccw_io_fctl(scsw->cmd.fctl, get_schid(private), + io_region->ret_code, errstr); +} + +/* + * Got an interrupt for a normal io (state busy). + */ +static void fsm_irq(struct vfio_ccw_private *private, + enum vfio_ccw_event event) +{ + struct irb *irb = this_cpu_ptr(&cio_irb); + + memcpy(&private->irb, irb, sizeof(*irb)); + + queue_work(vfio_ccw_work_q, &private->io_work); + + if (private->completion) + complete(private->completion); +} + +/* + * Device statemachine + */ +fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS] = { + [VFIO_CCW_STATE_NOT_OPER] = { + [VFIO_CCW_EVENT_NOT_OPER] = fsm_nop, + [VFIO_CCW_EVENT_IO_REQ] = fsm_io_error, + [VFIO_CCW_EVENT_INTERRUPT] = fsm_disabled_irq, + }, + [VFIO_CCW_STATE_STANDBY] = { + [VFIO_CCW_EVENT_NOT_OPER] = fsm_notoper, + [VFIO_CCW_EVENT_IO_REQ] = fsm_io_error, + [VFIO_CCW_EVENT_INTERRUPT] = fsm_irq, + }, + [VFIO_CCW_STATE_IDLE] = { + [VFIO_CCW_EVENT_NOT_OPER] = fsm_notoper, + [VFIO_CCW_EVENT_IO_REQ] = fsm_io_request, + [VFIO_CCW_EVENT_INTERRUPT] = fsm_irq, + }, + [VFIO_CCW_STATE_BOXED] = { + [VFIO_CCW_EVENT_NOT_OPER] = fsm_notoper, + [VFIO_CCW_EVENT_IO_REQ] = fsm_io_busy, + [VFIO_CCW_EVENT_INTERRUPT] = fsm_irq, + }, + [VFIO_CCW_STATE_BUSY] = { + [VFIO_CCW_EVENT_NOT_OPER] = fsm_notoper, + [VFIO_CCW_EVENT_IO_REQ] = fsm_io_busy, + [VFIO_CCW_EVENT_INTERRUPT] = fsm_irq, + }, +}; diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c new file mode 100644 index 000000000..6873ab5fe --- /dev/null +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -0,0 +1,435 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Physical device callbacks for vfio_ccw + * + * Copyright IBM Corp. 2017 + * + * Author(s): Dong Jia Shi + * Xiao Feng Ren + */ + +#include +#include + +#include "vfio_ccw_private.h" + +static int vfio_ccw_mdev_reset(struct mdev_device *mdev) +{ + struct vfio_ccw_private *private; + struct subchannel *sch; + int ret; + + private = dev_get_drvdata(mdev_parent_dev(mdev)); + sch = private->sch; + /* + * TODO: + * In the cureent stage, some things like "no I/O running" and "no + * interrupt pending" are clear, but we are not sure what other state + * we need to care about. + * There are still a lot more instructions need to be handled. We + * should come back here later. + */ + ret = vfio_ccw_sch_quiesce(sch); + if (ret) + return ret; + + ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch); + if (!ret) + private->state = VFIO_CCW_STATE_IDLE; + + return ret; +} + +static int vfio_ccw_mdev_notifier(struct notifier_block *nb, + unsigned long action, + void *data) +{ + struct vfio_ccw_private *private = + container_of(nb, struct vfio_ccw_private, nb); + + /* + * Vendor drivers MUST unpin pages in response to an + * invalidation. + */ + if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) { + struct vfio_iommu_type1_dma_unmap *unmap = data; + + if (!cp_iova_pinned(&private->cp, unmap->iova)) + return NOTIFY_OK; + + if (vfio_ccw_mdev_reset(private->mdev)) + return NOTIFY_BAD; + + cp_free(&private->cp); + return NOTIFY_OK; + } + + return NOTIFY_DONE; +} + +static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf) +{ + return sprintf(buf, "I/O subchannel (Non-QDIO)\n"); +} +static MDEV_TYPE_ATTR_RO(name); + +static ssize_t device_api_show(struct kobject *kobj, struct device *dev, + char *buf) +{ + return sprintf(buf, "%s\n", VFIO_DEVICE_API_CCW_STRING); +} +static MDEV_TYPE_ATTR_RO(device_api); + +static ssize_t available_instances_show(struct kobject *kobj, + struct device *dev, char *buf) +{ + struct vfio_ccw_private *private = dev_get_drvdata(dev); + + return sprintf(buf, "%d\n", atomic_read(&private->avail)); +} +static MDEV_TYPE_ATTR_RO(available_instances); + +static struct attribute *mdev_types_attrs[] = { + &mdev_type_attr_name.attr, + &mdev_type_attr_device_api.attr, + &mdev_type_attr_available_instances.attr, + NULL, +}; + +static struct attribute_group mdev_type_group = { + .name = "io", + .attrs = mdev_types_attrs, +}; + +static struct attribute_group *mdev_type_groups[] = { + &mdev_type_group, + NULL, +}; + +static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) +{ + struct vfio_ccw_private *private = + dev_get_drvdata(mdev_parent_dev(mdev)); + + if (private->state == VFIO_CCW_STATE_NOT_OPER) + return -ENODEV; + + if (atomic_dec_if_positive(&private->avail) < 0) + return -EPERM; + + private->mdev = mdev; + private->state = VFIO_CCW_STATE_IDLE; + + return 0; +} + +static int vfio_ccw_mdev_remove(struct mdev_device *mdev) +{ + struct vfio_ccw_private *private = + dev_get_drvdata(mdev_parent_dev(mdev)); + + if ((private->state != VFIO_CCW_STATE_NOT_OPER) && + (private->state != VFIO_CCW_STATE_STANDBY)) { + if (!vfio_ccw_sch_quiesce(private->sch)) + private->state = VFIO_CCW_STATE_STANDBY; + /* The state will be NOT_OPER on error. */ + } + + cp_free(&private->cp); + private->mdev = NULL; + atomic_inc(&private->avail); + + return 0; +} + +static int vfio_ccw_mdev_open(struct mdev_device *mdev) +{ + struct vfio_ccw_private *private = + dev_get_drvdata(mdev_parent_dev(mdev)); + unsigned long events = VFIO_IOMMU_NOTIFY_DMA_UNMAP; + + private->nb.notifier_call = vfio_ccw_mdev_notifier; + + return vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, + &events, &private->nb); +} + +static void vfio_ccw_mdev_release(struct mdev_device *mdev) +{ + struct vfio_ccw_private *private = + dev_get_drvdata(mdev_parent_dev(mdev)); + + if ((private->state != VFIO_CCW_STATE_NOT_OPER) && + (private->state != VFIO_CCW_STATE_STANDBY)) { + if (!vfio_ccw_mdev_reset(mdev)) + private->state = VFIO_CCW_STATE_STANDBY; + /* The state will be NOT_OPER on error. */ + } + + cp_free(&private->cp); + vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, + &private->nb); +} + +static ssize_t vfio_ccw_mdev_read(struct mdev_device *mdev, + char __user *buf, + size_t count, + loff_t *ppos) +{ + struct vfio_ccw_private *private; + struct ccw_io_region *region; + + if (*ppos + count > sizeof(*region)) + return -EINVAL; + + private = dev_get_drvdata(mdev_parent_dev(mdev)); + region = private->io_region; + if (copy_to_user(buf, (void *)region + *ppos, count)) + return -EFAULT; + + return count; +} + +static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev, + const char __user *buf, + size_t count, + loff_t *ppos) +{ + struct vfio_ccw_private *private; + struct ccw_io_region *region; + + if (*ppos + count > sizeof(*region)) + return -EINVAL; + + private = dev_get_drvdata(mdev_parent_dev(mdev)); + if (private->state != VFIO_CCW_STATE_IDLE) + return -EACCES; + + region = private->io_region; + if (copy_from_user((void *)region + *ppos, buf, count)) + return -EFAULT; + + vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_IO_REQ); + if (region->ret_code != 0) { + private->state = VFIO_CCW_STATE_IDLE; + return region->ret_code; + } + + return count; +} + +static int vfio_ccw_mdev_get_device_info(struct vfio_device_info *info) +{ + info->flags = VFIO_DEVICE_FLAGS_CCW | VFIO_DEVICE_FLAGS_RESET; + info->num_regions = VFIO_CCW_NUM_REGIONS; + info->num_irqs = VFIO_CCW_NUM_IRQS; + + return 0; +} + +static int vfio_ccw_mdev_get_region_info(struct vfio_region_info *info, + u16 *cap_type_id, + void **cap_type) +{ + switch (info->index) { + case VFIO_CCW_CONFIG_REGION_INDEX: + info->offset = 0; + info->size = sizeof(struct ccw_io_region); + info->flags = VFIO_REGION_INFO_FLAG_READ + | VFIO_REGION_INFO_FLAG_WRITE; + return 0; + default: + return -EINVAL; + } +} + +static int vfio_ccw_mdev_get_irq_info(struct vfio_irq_info *info) +{ + if (info->index != VFIO_CCW_IO_IRQ_INDEX) + return -EINVAL; + + info->count = 1; + info->flags = VFIO_IRQ_INFO_EVENTFD; + + return 0; +} + +static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev, + uint32_t flags, + void __user *data) +{ + struct vfio_ccw_private *private; + struct eventfd_ctx **ctx; + + if (!(flags & VFIO_IRQ_SET_ACTION_TRIGGER)) + return -EINVAL; + + private = dev_get_drvdata(mdev_parent_dev(mdev)); + ctx = &private->io_trigger; + + switch (flags & VFIO_IRQ_SET_DATA_TYPE_MASK) { + case VFIO_IRQ_SET_DATA_NONE: + { + if (*ctx) + eventfd_signal(*ctx, 1); + return 0; + } + case VFIO_IRQ_SET_DATA_BOOL: + { + uint8_t trigger; + + if (get_user(trigger, (uint8_t __user *)data)) + return -EFAULT; + + if (trigger && *ctx) + eventfd_signal(*ctx, 1); + return 0; + } + case VFIO_IRQ_SET_DATA_EVENTFD: + { + int32_t fd; + + if (get_user(fd, (int32_t __user *)data)) + return -EFAULT; + + if (fd == -1) { + if (*ctx) + eventfd_ctx_put(*ctx); + *ctx = NULL; + } else if (fd >= 0) { + struct eventfd_ctx *efdctx; + + efdctx = eventfd_ctx_fdget(fd); + if (IS_ERR(efdctx)) + return PTR_ERR(efdctx); + + if (*ctx) + eventfd_ctx_put(*ctx); + + *ctx = efdctx; + } else + return -EINVAL; + + return 0; + } + default: + return -EINVAL; + } +} + +static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, + unsigned int cmd, + unsigned long arg) +{ + int ret = 0; + unsigned long minsz; + + switch (cmd) { + case VFIO_DEVICE_GET_INFO: + { + struct vfio_device_info info; + + minsz = offsetofend(struct vfio_device_info, num_irqs); + + if (copy_from_user(&info, (void __user *)arg, minsz)) + return -EFAULT; + + if (info.argsz < minsz) + return -EINVAL; + + ret = vfio_ccw_mdev_get_device_info(&info); + if (ret) + return ret; + + return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0; + } + case VFIO_DEVICE_GET_REGION_INFO: + { + struct vfio_region_info info; + u16 cap_type_id = 0; + void *cap_type = NULL; + + minsz = offsetofend(struct vfio_region_info, offset); + + if (copy_from_user(&info, (void __user *)arg, minsz)) + return -EFAULT; + + if (info.argsz < minsz) + return -EINVAL; + + ret = vfio_ccw_mdev_get_region_info(&info, &cap_type_id, + &cap_type); + if (ret) + return ret; + + return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0; + } + case VFIO_DEVICE_GET_IRQ_INFO: + { + struct vfio_irq_info info; + + minsz = offsetofend(struct vfio_irq_info, count); + + if (copy_from_user(&info, (void __user *)arg, minsz)) + return -EFAULT; + + if (info.argsz < minsz || info.index >= VFIO_CCW_NUM_IRQS) + return -EINVAL; + + ret = vfio_ccw_mdev_get_irq_info(&info); + if (ret) + return ret; + + if (info.count == -1) + return -EINVAL; + + return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0; + } + case VFIO_DEVICE_SET_IRQS: + { + struct vfio_irq_set hdr; + size_t data_size; + void __user *data; + + minsz = offsetofend(struct vfio_irq_set, count); + + if (copy_from_user(&hdr, (void __user *)arg, minsz)) + return -EFAULT; + + ret = vfio_set_irqs_validate_and_prepare(&hdr, 1, + VFIO_CCW_NUM_IRQS, + &data_size); + if (ret) + return ret; + + data = (void __user *)(arg + minsz); + return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, data); + } + case VFIO_DEVICE_RESET: + return vfio_ccw_mdev_reset(mdev); + default: + return -ENOTTY; + } +} + +static const struct mdev_parent_ops vfio_ccw_mdev_ops = { + .owner = THIS_MODULE, + .supported_type_groups = mdev_type_groups, + .create = vfio_ccw_mdev_create, + .remove = vfio_ccw_mdev_remove, + .open = vfio_ccw_mdev_open, + .release = vfio_ccw_mdev_release, + .read = vfio_ccw_mdev_read, + .write = vfio_ccw_mdev_write, + .ioctl = vfio_ccw_mdev_ioctl, +}; + +int vfio_ccw_mdev_reg(struct subchannel *sch) +{ + return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops); +} + +void vfio_ccw_mdev_unreg(struct subchannel *sch) +{ + mdev_unregister_device(&sch->dev); +} diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h new file mode 100644 index 000000000..078e46f96 --- /dev/null +++ b/drivers/s390/cio/vfio_ccw_private.h @@ -0,0 +1,97 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Private stuff for vfio_ccw driver + * + * Copyright IBM Corp. 2017 + * + * Author(s): Dong Jia Shi + * Xiao Feng Ren + */ + +#ifndef _VFIO_CCW_PRIVATE_H_ +#define _VFIO_CCW_PRIVATE_H_ + +#include +#include +#include +#include + +#include "css.h" +#include "vfio_ccw_cp.h" + +/** + * struct vfio_ccw_private + * @sch: pointer to the subchannel + * @state: internal state of the device + * @completion: synchronization helper of the I/O completion + * @avail: available for creating a mediated device + * @mdev: pointer to the mediated device + * @nb: notifier for vfio events + * @io_region: MMIO region to input/output I/O arguments/results + * @cp: channel program for the current I/O operation + * @irb: irb info received from interrupt + * @scsw: scsw info + * @io_trigger: eventfd ctx for signaling userspace I/O results + * @io_work: work for deferral process of I/O handling + */ +struct vfio_ccw_private { + struct subchannel *sch; + int state; + struct completion *completion; + atomic_t avail; + struct mdev_device *mdev; + struct notifier_block nb; + struct ccw_io_region *io_region; + + struct channel_program cp; + struct irb irb; + union scsw scsw; + + struct eventfd_ctx *io_trigger; + struct work_struct io_work; +} __aligned(8); + +extern int vfio_ccw_mdev_reg(struct subchannel *sch); +extern void vfio_ccw_mdev_unreg(struct subchannel *sch); + +extern int vfio_ccw_sch_quiesce(struct subchannel *sch); + +/* + * States of the device statemachine. + */ +enum vfio_ccw_state { + VFIO_CCW_STATE_NOT_OPER, + VFIO_CCW_STATE_STANDBY, + VFIO_CCW_STATE_IDLE, + VFIO_CCW_STATE_BOXED, + VFIO_CCW_STATE_BUSY, + /* last element! */ + NR_VFIO_CCW_STATES +}; + +/* + * Asynchronous events of the device statemachine. + */ +enum vfio_ccw_event { + VFIO_CCW_EVENT_NOT_OPER, + VFIO_CCW_EVENT_IO_REQ, + VFIO_CCW_EVENT_INTERRUPT, + /* last element! */ + NR_VFIO_CCW_EVENTS +}; + +/* + * Action called through jumptable. + */ +typedef void (fsm_func_t)(struct vfio_ccw_private *, enum vfio_ccw_event); +extern fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS]; + +static inline void vfio_ccw_fsm_event(struct vfio_ccw_private *private, + int event) +{ + vfio_ccw_jumptable[private->state][event](private, event); +} + +extern struct workqueue_struct *vfio_ccw_work_q; + +#endif diff --git a/drivers/s390/cio/vfio_ccw_trace.h b/drivers/s390/cio/vfio_ccw_trace.h new file mode 100644 index 000000000..b1da53dde --- /dev/null +++ b/drivers/s390/cio/vfio_ccw_trace.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0 + * Tracepoints for vfio_ccw driver + * + * Copyright IBM Corp. 2018 + * + * Author(s): Dong Jia Shi + * Halil Pasic + */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM vfio_ccw + +#if !defined(_VFIO_CCW_TRACE_) || defined(TRACE_HEADER_MULTI_READ) +#define _VFIO_CCW_TRACE_ + +#include + +TRACE_EVENT(vfio_ccw_io_fctl, + TP_PROTO(int fctl, struct subchannel_id schid, int errno, char *errstr), + TP_ARGS(fctl, schid, errno, errstr), + + TP_STRUCT__entry( + __field(int, fctl) + __field_struct(struct subchannel_id, schid) + __field(int, errno) + __field(char*, errstr) + ), + + TP_fast_assign( + __entry->fctl = fctl; + __entry->schid = schid; + __entry->errno = errno; + __entry->errstr = errstr; + ), + + TP_printk("schid=%x.%x.%04x fctl=%x errno=%d info=%s", + __entry->schid.cssid, + __entry->schid.ssid, + __entry->schid.sch_no, + __entry->fctl, + __entry->errno, + __entry->errstr) +); + +#endif /* _VFIO_CCW_TRACE_ */ + +/* This part must be outside protection */ + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE vfio_ccw_trace + +#include diff --git a/drivers/s390/crypto/Makefile b/drivers/s390/crypto/Makefile new file mode 100644 index 000000000..b59af548e --- /dev/null +++ b/drivers/s390/crypto/Makefile @@ -0,0 +1,17 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# S/390 crypto devices +# + +ap-objs := ap_bus.o ap_card.o ap_queue.o +obj-$(subst m,y,$(CONFIG_ZCRYPT)) += ap.o +# zcrypt_api.o and zcrypt_msgtype*.o depend on ap.o +zcrypt-objs := zcrypt_api.o zcrypt_card.o zcrypt_queue.o +zcrypt-objs += zcrypt_msgtype6.o zcrypt_msgtype50.o +obj-$(CONFIG_ZCRYPT) += zcrypt.o +# adapter drivers depend on ap.o and zcrypt.o +obj-$(CONFIG_ZCRYPT) += zcrypt_pcixcc.o zcrypt_cex2a.o zcrypt_cex4.o + +# pkey kernel module +pkey-objs := pkey_api.o +obj-$(CONFIG_PKEY) += pkey.o diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c new file mode 100644 index 000000000..027a53eec --- /dev/null +++ b/drivers/s390/crypto/ap_bus.c @@ -0,0 +1,1620 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright IBM Corp. 2006, 2012 + * Author(s): Cornelia Huck + * Martin Schwidefsky + * Ralph Wuerthner + * Felix Beck + * Holger Dengler + * + * Adjunct processor bus. + */ + +#define KMSG_COMPONENT "ap" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "ap_bus.h" +#include "ap_debug.h" + +/* + * Module parameters; note though this file itself isn't modular. + */ +int ap_domain_index = -1; /* Adjunct Processor Domain Index */ +static DEFINE_SPINLOCK(ap_domain_lock); +module_param_named(domain, ap_domain_index, int, 0440); +MODULE_PARM_DESC(domain, "domain index for ap devices"); +EXPORT_SYMBOL(ap_domain_index); + +static int ap_thread_flag; +module_param_named(poll_thread, ap_thread_flag, int, 0440); +MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); + +static char *apm_str; +module_param_named(apmask, apm_str, charp, 0440); +MODULE_PARM_DESC(apmask, "AP bus adapter mask."); + +static char *aqm_str; +module_param_named(aqmask, aqm_str, charp, 0440); +MODULE_PARM_DESC(aqmask, "AP bus domain mask."); + +static struct device *ap_root_device; + +DEFINE_SPINLOCK(ap_list_lock); +LIST_HEAD(ap_card_list); + +/* Default permissions (card and domain masking) */ +static struct ap_perms { + DECLARE_BITMAP(apm, AP_DEVICES); + DECLARE_BITMAP(aqm, AP_DOMAINS); +} ap_perms; +static DEFINE_MUTEX(ap_perms_mutex); + +static struct ap_config_info *ap_configuration; +static bool initialised; + +/* + * AP bus related debug feature things. + */ +debug_info_t *ap_dbf_info; + +/* + * Workqueue timer for bus rescan. + */ +static struct timer_list ap_config_timer; +static int ap_config_time = AP_CONFIG_TIME; +static void ap_scan_bus(struct work_struct *); +static DECLARE_WORK(ap_scan_work, ap_scan_bus); + +/* + * Tasklet & timer for AP request polling and interrupts + */ +static void ap_tasklet_fn(unsigned long); +static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 0); +static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); +static struct task_struct *ap_poll_kthread; +static DEFINE_MUTEX(ap_poll_thread_mutex); +static DEFINE_SPINLOCK(ap_poll_timer_lock); +static struct hrtimer ap_poll_timer; +/* + * In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. + * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling. + */ +static unsigned long long poll_timeout = 250000; + +/* Suspend flag */ +static int ap_suspend_flag; +/* Maximum domain id */ +static int ap_max_domain_id; +/* + * Flag to check if domain was set through module parameter domain=. This is + * important when supsend and resume is done in a z/VM environment where the + * domain might change. + */ +static int user_set_domain; +static struct bus_type ap_bus_type; + +/* Adapter interrupt definitions */ +static void ap_interrupt_handler(struct airq_struct *airq); + +static int ap_airq_flag; + +static struct airq_struct ap_airq = { + .handler = ap_interrupt_handler, + .isc = AP_ISC, +}; + +/** + * ap_using_interrupts() - Returns non-zero if interrupt support is + * available. + */ +static inline int ap_using_interrupts(void) +{ + return ap_airq_flag; +} + +/** + * ap_airq_ptr() - Get the address of the adapter interrupt indicator + * + * Returns the address of the local-summary-indicator of the adapter + * interrupt handler for AP, or NULL if adapter interrupts are not + * available. + */ +void *ap_airq_ptr(void) +{ + if (ap_using_interrupts()) + return ap_airq.lsi_ptr; + return NULL; +} + +/** + * ap_interrupts_available(): Test if AP interrupts are available. + * + * Returns 1 if AP interrupts are available. + */ +static int ap_interrupts_available(void) +{ + return test_facility(65); +} + +/** + * ap_configuration_available(): Test if AP configuration + * information is available. + * + * Returns 1 if AP configuration information is available. + */ +static int ap_configuration_available(void) +{ + return test_facility(12); +} + +/** + * ap_apft_available(): Test if AP facilities test (APFT) + * facility is available. + * + * Returns 1 if APFT is is available. + */ +static int ap_apft_available(void) +{ + return test_facility(15); +} + +/* + * ap_qact_available(): Test if the PQAP(QACT) subfunction is available. + * + * Returns 1 if the QACT subfunction is available. + */ +static inline int ap_qact_available(void) +{ + if (ap_configuration) + return ap_configuration->qact; + return 0; +} + +/* + * ap_query_configuration(): Fetch cryptographic config info + * + * Returns the ap configuration info fetched via PQAP(QCI). + * On success 0 is returned, on failure a negative errno + * is returned, e.g. if the PQAP(QCI) instruction is not + * available, the return value will be -EOPNOTSUPP. + */ +static inline int ap_query_configuration(struct ap_config_info *info) +{ + if (!ap_configuration_available()) + return -EOPNOTSUPP; + if (!info) + return -EINVAL; + return ap_qci(info); +} +EXPORT_SYMBOL(ap_query_configuration); + +/** + * ap_init_configuration(): Allocate and query configuration array. + */ +static void ap_init_configuration(void) +{ + if (!ap_configuration_available()) + return; + + ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL); + if (!ap_configuration) + return; + if (ap_query_configuration(ap_configuration) != 0) { + kfree(ap_configuration); + ap_configuration = NULL; + return; + } +} + +/* + * ap_test_config(): helper function to extract the nrth bit + * within the unsigned int array field. + */ +static inline int ap_test_config(unsigned int *field, unsigned int nr) +{ + return ap_test_bit((field + (nr >> 5)), (nr & 0x1f)); +} + +/* + * ap_test_config_card_id(): Test, whether an AP card ID is configured. + * @id AP card ID + * + * Returns 0 if the card is not configured + * 1 if the card is configured or + * if the configuration information is not available + */ +static inline int ap_test_config_card_id(unsigned int id) +{ + if (!ap_configuration) /* QCI not supported */ + /* only ids 0...3F may be probed */ + return id < 0x40 ? 1 : 0; + return ap_test_config(ap_configuration->apm, id); +} + +/* + * ap_test_config_domain(): Test, whether an AP usage domain is configured. + * @domain AP usage domain ID + * + * Returns 0 if the usage domain is not configured + * 1 if the usage domain is configured or + * if the configuration information is not available + */ +static inline int ap_test_config_domain(unsigned int domain) +{ + if (!ap_configuration) /* QCI not supported */ + return domain < 16; + return ap_test_config(ap_configuration->aqm, domain); +} + +/** + * ap_query_queue(): Check if an AP queue is available. + * @qid: The AP queue number + * @queue_depth: Pointer to queue depth value + * @device_type: Pointer to device type value + * @facilities: Pointer to facility indicator + */ +static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type, + unsigned int *facilities) +{ + struct ap_queue_status status; + unsigned long info; + int nd; + + if (!ap_test_config_card_id(AP_QID_CARD(qid))) + return -ENODEV; + + status = ap_test_queue(qid, ap_apft_available(), &info); + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + *queue_depth = (int)(info & 0xff); + *device_type = (int)((info >> 24) & 0xff); + *facilities = (unsigned int)(info >> 32); + /* Update maximum domain id */ + nd = (info >> 16) & 0xff; + /* if N bit is available, z13 and newer */ + if ((info & (1UL << 57)) && nd > 0) + ap_max_domain_id = nd; + else /* older machine types */ + ap_max_domain_id = 15; + switch (*device_type) { + /* For CEX2 and CEX3 the available functions + * are not refrected by the facilities bits. + * Instead it is coded into the type. So here + * modify the function bits based on the type. + */ + case AP_DEVICE_TYPE_CEX2A: + case AP_DEVICE_TYPE_CEX3A: + *facilities |= 0x08000000; + break; + case AP_DEVICE_TYPE_CEX2C: + case AP_DEVICE_TYPE_CEX3C: + *facilities |= 0x10000000; + break; + default: + break; + } + return 0; + case AP_RESPONSE_Q_NOT_AVAIL: + case AP_RESPONSE_DECONFIGURED: + case AP_RESPONSE_CHECKSTOPPED: + case AP_RESPONSE_INVALID_ADDRESS: + return -ENODEV; + case AP_RESPONSE_RESET_IN_PROGRESS: + case AP_RESPONSE_OTHERWISE_CHANGED: + case AP_RESPONSE_BUSY: + return -EBUSY; + default: + BUG(); + } +} + +void ap_wait(enum ap_wait wait) +{ + ktime_t hr_time; + + switch (wait) { + case AP_WAIT_AGAIN: + case AP_WAIT_INTERRUPT: + if (ap_using_interrupts()) + break; + if (ap_poll_kthread) { + wake_up(&ap_poll_wait); + break; + } + /* Fall through */ + case AP_WAIT_TIMEOUT: + spin_lock_bh(&ap_poll_timer_lock); + if (!hrtimer_is_queued(&ap_poll_timer)) { + hr_time = poll_timeout; + hrtimer_forward_now(&ap_poll_timer, hr_time); + hrtimer_restart(&ap_poll_timer); + } + spin_unlock_bh(&ap_poll_timer_lock); + break; + case AP_WAIT_NONE: + default: + break; + } +} + +/** + * ap_request_timeout(): Handling of request timeouts + * @t: timer making this callback + * + * Handles request timeouts. + */ +void ap_request_timeout(struct timer_list *t) +{ + struct ap_queue *aq = from_timer(aq, t, timeout); + + if (ap_suspend_flag) + return; + spin_lock_bh(&aq->lock); + ap_wait(ap_sm_event(aq, AP_EVENT_TIMEOUT)); + spin_unlock_bh(&aq->lock); +} + +/** + * ap_poll_timeout(): AP receive polling for finished AP requests. + * @unused: Unused pointer. + * + * Schedules the AP tasklet using a high resolution timer. + */ +static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) +{ + if (!ap_suspend_flag) + tasklet_schedule(&ap_tasklet); + return HRTIMER_NORESTART; +} + +/** + * ap_interrupt_handler() - Schedule ap_tasklet on interrupt + * @airq: pointer to adapter interrupt descriptor + */ +static void ap_interrupt_handler(struct airq_struct *airq) +{ + inc_irq_stat(IRQIO_APB); + if (!ap_suspend_flag) + tasklet_schedule(&ap_tasklet); +} + +/** + * ap_tasklet_fn(): Tasklet to poll all AP devices. + * @dummy: Unused variable + * + * Poll all AP devices on the bus. + */ +static void ap_tasklet_fn(unsigned long dummy) +{ + struct ap_card *ac; + struct ap_queue *aq; + enum ap_wait wait = AP_WAIT_NONE; + + /* Reset the indicator if interrupts are used. Thus new interrupts can + * be received. Doing it in the beginning of the tasklet is therefor + * important that no requests on any AP get lost. + */ + if (ap_using_interrupts()) + xchg(ap_airq.lsi_ptr, 0); + + spin_lock_bh(&ap_list_lock); + for_each_ap_card(ac) { + for_each_ap_queue(aq, ac) { + spin_lock_bh(&aq->lock); + wait = min(wait, ap_sm_event_loop(aq, AP_EVENT_POLL)); + spin_unlock_bh(&aq->lock); + } + } + spin_unlock_bh(&ap_list_lock); + + ap_wait(wait); +} + +static int ap_pending_requests(void) +{ + struct ap_card *ac; + struct ap_queue *aq; + + spin_lock_bh(&ap_list_lock); + for_each_ap_card(ac) { + for_each_ap_queue(aq, ac) { + if (aq->queue_count == 0) + continue; + spin_unlock_bh(&ap_list_lock); + return 1; + } + } + spin_unlock_bh(&ap_list_lock); + return 0; +} + +/** + * ap_poll_thread(): Thread that polls for finished requests. + * @data: Unused pointer + * + * AP bus poll thread. The purpose of this thread is to poll for + * finished requests in a loop if there is a "free" cpu - that is + * a cpu that doesn't have anything better to do. The polling stops + * as soon as there is another task or if all messages have been + * delivered. + */ +static int ap_poll_thread(void *data) +{ + DECLARE_WAITQUEUE(wait, current); + + set_user_nice(current, MAX_NICE); + set_freezable(); + while (!kthread_should_stop()) { + add_wait_queue(&ap_poll_wait, &wait); + set_current_state(TASK_INTERRUPTIBLE); + if (ap_suspend_flag || !ap_pending_requests()) { + schedule(); + try_to_freeze(); + } + set_current_state(TASK_RUNNING); + remove_wait_queue(&ap_poll_wait, &wait); + if (need_resched()) { + schedule(); + try_to_freeze(); + continue; + } + ap_tasklet_fn(0); + } + + return 0; +} + +static int ap_poll_thread_start(void) +{ + int rc; + + if (ap_using_interrupts() || ap_poll_kthread) + return 0; + mutex_lock(&ap_poll_thread_mutex); + ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); + rc = PTR_ERR_OR_ZERO(ap_poll_kthread); + if (rc) + ap_poll_kthread = NULL; + mutex_unlock(&ap_poll_thread_mutex); + return rc; +} + +static void ap_poll_thread_stop(void) +{ + if (!ap_poll_kthread) + return; + mutex_lock(&ap_poll_thread_mutex); + kthread_stop(ap_poll_kthread); + ap_poll_kthread = NULL; + mutex_unlock(&ap_poll_thread_mutex); +} + +#define is_card_dev(x) ((x)->parent == ap_root_device) +#define is_queue_dev(x) ((x)->parent != ap_root_device) + +/** + * ap_bus_match() + * @dev: Pointer to device + * @drv: Pointer to device_driver + * + * AP bus driver registration/unregistration. + */ +static int ap_bus_match(struct device *dev, struct device_driver *drv) +{ + struct ap_driver *ap_drv = to_ap_drv(drv); + struct ap_device_id *id; + + /* + * Compare device type of the device with the list of + * supported types of the device_driver. + */ + for (id = ap_drv->ids; id->match_flags; id++) { + if (is_card_dev(dev) && + id->match_flags & AP_DEVICE_ID_MATCH_CARD_TYPE && + id->dev_type == to_ap_dev(dev)->device_type) + return 1; + if (is_queue_dev(dev) && + id->match_flags & AP_DEVICE_ID_MATCH_QUEUE_TYPE && + id->dev_type == to_ap_dev(dev)->device_type) + return 1; + } + return 0; +} + +/** + * ap_uevent(): Uevent function for AP devices. + * @dev: Pointer to device + * @env: Pointer to kobj_uevent_env + * + * It sets up a single environment variable DEV_TYPE which contains the + * hardware device type. + */ +static int ap_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct ap_device *ap_dev = to_ap_dev(dev); + int retval = 0; + + if (!ap_dev) + return -ENODEV; + + /* Set up DEV_TYPE environment variable. */ + retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); + if (retval) + return retval; + + /* Add MODALIAS= */ + retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); + + return retval; +} + +static int ap_dev_suspend(struct device *dev) +{ + struct ap_device *ap_dev = to_ap_dev(dev); + + if (ap_dev->drv && ap_dev->drv->suspend) + ap_dev->drv->suspend(ap_dev); + return 0; +} + +static int ap_dev_resume(struct device *dev) +{ + struct ap_device *ap_dev = to_ap_dev(dev); + + if (ap_dev->drv && ap_dev->drv->resume) + ap_dev->drv->resume(ap_dev); + return 0; +} + +static void ap_bus_suspend(void) +{ + AP_DBF(DBF_DEBUG, "%s running\n", __func__); + + ap_suspend_flag = 1; + /* + * Disable scanning for devices, thus we do not want to scan + * for them after removing. + */ + flush_work(&ap_scan_work); + tasklet_disable(&ap_tasklet); +} + +static int __ap_card_devices_unregister(struct device *dev, void *dummy) +{ + if (is_card_dev(dev)) + device_unregister(dev); + return 0; +} + +static int __ap_queue_devices_unregister(struct device *dev, void *dummy) +{ + if (is_queue_dev(dev)) + device_unregister(dev); + return 0; +} + +static int __ap_queue_devices_with_id_unregister(struct device *dev, void *data) +{ + if (is_queue_dev(dev) && + AP_QID_CARD(to_ap_queue(dev)->qid) == (int)(long) data) + device_unregister(dev); + return 0; +} + +static void ap_bus_resume(void) +{ + int rc; + + AP_DBF(DBF_DEBUG, "%s running\n", __func__); + + /* remove all queue devices */ + bus_for_each_dev(&ap_bus_type, NULL, NULL, + __ap_queue_devices_unregister); + /* remove all card devices */ + bus_for_each_dev(&ap_bus_type, NULL, NULL, + __ap_card_devices_unregister); + + /* Reset thin interrupt setting */ + if (ap_interrupts_available() && !ap_using_interrupts()) { + rc = register_adapter_interrupt(&ap_airq); + ap_airq_flag = (rc == 0); + } + if (!ap_interrupts_available() && ap_using_interrupts()) { + unregister_adapter_interrupt(&ap_airq); + ap_airq_flag = 0; + } + /* Reset domain */ + if (!user_set_domain) + ap_domain_index = -1; + /* Get things going again */ + ap_suspend_flag = 0; + if (ap_airq_flag) + xchg(ap_airq.lsi_ptr, 0); + tasklet_enable(&ap_tasklet); + queue_work(system_long_wq, &ap_scan_work); +} + +static int ap_power_event(struct notifier_block *this, unsigned long event, + void *ptr) +{ + switch (event) { + case PM_HIBERNATION_PREPARE: + case PM_SUSPEND_PREPARE: + ap_bus_suspend(); + break; + case PM_POST_HIBERNATION: + case PM_POST_SUSPEND: + ap_bus_resume(); + break; + default: + break; + } + return NOTIFY_DONE; +} +static struct notifier_block ap_power_notifier = { + .notifier_call = ap_power_event, +}; + +static SIMPLE_DEV_PM_OPS(ap_bus_pm_ops, ap_dev_suspend, ap_dev_resume); + +static struct bus_type ap_bus_type = { + .name = "ap", + .match = &ap_bus_match, + .uevent = &ap_uevent, + .pm = &ap_bus_pm_ops, +}; + +static int __ap_revise_reserved(struct device *dev, void *dummy) +{ + int rc, card, queue, devres, drvres; + + if (is_queue_dev(dev)) { + card = AP_QID_CARD(to_ap_queue(dev)->qid); + queue = AP_QID_QUEUE(to_ap_queue(dev)->qid); + mutex_lock(&ap_perms_mutex); + devres = test_bit_inv(card, ap_perms.apm) + && test_bit_inv(queue, ap_perms.aqm); + mutex_unlock(&ap_perms_mutex); + drvres = to_ap_drv(dev->driver)->flags + & AP_DRIVER_FLAG_DEFAULT; + if (!!devres != !!drvres) { + AP_DBF(DBF_DEBUG, "reprobing queue=%02x.%04x\n", + card, queue); + rc = device_reprobe(dev); + } + } + + return 0; +} + +static void ap_bus_revise_bindings(void) +{ + bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revise_reserved); +} + +int ap_owned_by_def_drv(int card, int queue) +{ + int rc = 0; + + if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS) + return -EINVAL; + + mutex_lock(&ap_perms_mutex); + + if (test_bit_inv(card, ap_perms.apm) + && test_bit_inv(queue, ap_perms.aqm)) + rc = 1; + + mutex_unlock(&ap_perms_mutex); + + return rc; +} +EXPORT_SYMBOL(ap_owned_by_def_drv); + +int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm, + unsigned long *aqm) +{ + int card, queue, rc = 0; + + mutex_lock(&ap_perms_mutex); + + for (card = 0; !rc && card < AP_DEVICES; card++) + if (test_bit_inv(card, apm) && + test_bit_inv(card, ap_perms.apm)) + for (queue = 0; !rc && queue < AP_DOMAINS; queue++) + if (test_bit_inv(queue, aqm) && + test_bit_inv(queue, ap_perms.aqm)) + rc = 1; + + mutex_unlock(&ap_perms_mutex); + + return rc; +} +EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv); + +static int ap_device_probe(struct device *dev) +{ + struct ap_device *ap_dev = to_ap_dev(dev); + struct ap_driver *ap_drv = to_ap_drv(dev->driver); + int card, queue, devres, drvres, rc; + + if (is_queue_dev(dev)) { + /* + * If the apqn is marked as reserved/used by ap bus and + * default drivers, only probe with drivers with the default + * flag set. If it is not marked, only probe with drivers + * with the default flag not set. + */ + card = AP_QID_CARD(to_ap_queue(dev)->qid); + queue = AP_QID_QUEUE(to_ap_queue(dev)->qid); + mutex_lock(&ap_perms_mutex); + devres = test_bit_inv(card, ap_perms.apm) + && test_bit_inv(queue, ap_perms.aqm); + mutex_unlock(&ap_perms_mutex); + drvres = ap_drv->flags & AP_DRIVER_FLAG_DEFAULT; + if (!!devres != !!drvres) + return -ENODEV; + /* (re-)init queue's state machine */ + ap_queue_reinit_state(to_ap_queue(dev)); + } + + /* Add queue/card to list of active queues/cards */ + spin_lock_bh(&ap_list_lock); + if (is_card_dev(dev)) + list_add(&to_ap_card(dev)->list, &ap_card_list); + else + list_add(&to_ap_queue(dev)->list, + &to_ap_queue(dev)->card->queues); + spin_unlock_bh(&ap_list_lock); + + ap_dev->drv = ap_drv; + rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; + + if (rc) { + spin_lock_bh(&ap_list_lock); + if (is_card_dev(dev)) + list_del_init(&to_ap_card(dev)->list); + else + list_del_init(&to_ap_queue(dev)->list); + spin_unlock_bh(&ap_list_lock); + ap_dev->drv = NULL; + } + + return rc; +} + +static int ap_device_remove(struct device *dev) +{ + struct ap_device *ap_dev = to_ap_dev(dev); + struct ap_driver *ap_drv = ap_dev->drv; + + if (is_queue_dev(dev)) + ap_queue_remove(to_ap_queue(dev)); + if (ap_drv->remove) + ap_drv->remove(ap_dev); + + /* Remove queue/card from list of active queues/cards */ + spin_lock_bh(&ap_list_lock); + if (is_card_dev(dev)) + list_del_init(&to_ap_card(dev)->list); + else + list_del_init(&to_ap_queue(dev)->list); + spin_unlock_bh(&ap_list_lock); + + return 0; +} + +int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, + char *name) +{ + struct device_driver *drv = &ap_drv->driver; + + if (!initialised) + return -ENODEV; + + drv->bus = &ap_bus_type; + drv->probe = ap_device_probe; + drv->remove = ap_device_remove; + drv->owner = owner; + drv->name = name; + return driver_register(drv); +} +EXPORT_SYMBOL(ap_driver_register); + +void ap_driver_unregister(struct ap_driver *ap_drv) +{ + driver_unregister(&ap_drv->driver); +} +EXPORT_SYMBOL(ap_driver_unregister); + +void ap_bus_force_rescan(void) +{ + if (ap_suspend_flag) + return; + /* processing a asynchronous bus rescan */ + del_timer(&ap_config_timer); + queue_work(system_long_wq, &ap_scan_work); + flush_work(&ap_scan_work); +} +EXPORT_SYMBOL(ap_bus_force_rescan); + +/* + * hex2bitmap() - parse hex mask string and set bitmap. + * Valid strings are "0x012345678" with at least one valid hex number. + * Rest of the bitmap to the right is padded with 0. No spaces allowed + * within the string, the leading 0x may be omitted. + * Returns the bitmask with exactly the bits set as given by the hex + * string (both in big endian order). + */ +static int hex2bitmap(const char *str, unsigned long *bitmap, int bits) +{ + int i, n, b; + + /* bits needs to be a multiple of 8 */ + if (bits & 0x07) + return -EINVAL; + + if (str[0] == '0' && str[1] == 'x') + str++; + if (*str == 'x') + str++; + + for (i = 0; isxdigit(*str) && i < bits; str++) { + b = hex_to_bin(*str); + for (n = 0; n < 4; n++) + if (b & (0x08 >> n)) + set_bit_inv(i + n, bitmap); + i += 4; + } + + if (*str == '\n') + str++; + if (*str) + return -EINVAL; + return 0; +} + +/* + * modify_bitmap() - parse bitmask argument and modify an existing + * bit mask accordingly. A concatenation (done with ',') of these + * terms is recognized: + * +[-] or -[-] + * may be any valid number (hex, decimal or octal) in the range + * 0...bits-1; the leading + or - is required. Here are some examples: + * +0-15,+32,-128,-0xFF + * -0-255,+1-16,+0x128 + * +1,+2,+3,+4,-5,-7-10 + * Returns the new bitmap after all changes have been applied. Every + * positive value in the string will set a bit and every negative value + * in the string will clear a bit. As a bit may be touched more than once, + * the last 'operation' wins: + * +0-255,-128 = first bits 0-255 will be set, then bit 128 will be + * cleared again. All other bits are unmodified. + */ +static int modify_bitmap(const char *str, unsigned long *bitmap, int bits) +{ + int a, i, z; + char *np, sign; + + /* bits needs to be a multiple of 8 */ + if (bits & 0x07) + return -EINVAL; + + while (*str) { + sign = *str++; + if (sign != '+' && sign != '-') + return -EINVAL; + a = z = simple_strtoul(str, &np, 0); + if (str == np || a >= bits) + return -EINVAL; + str = np; + if (*str == '-') { + z = simple_strtoul(++str, &np, 0); + if (str == np || a > z || z >= bits) + return -EINVAL; + str = np; + } + for (i = a; i <= z; i++) + if (sign == '+') + set_bit_inv(i, bitmap); + else + clear_bit_inv(i, bitmap); + while (*str == ',' || *str == '\n') + str++; + } + + return 0; +} + +/* + * process_mask_arg() - parse a bitmap string and clear/set the + * bits in the bitmap accordingly. The string may be given as + * absolute value, a hex string like 0x1F2E3D4C5B6A" simple over- + * writing the current content of the bitmap. Or as relative string + * like "+1-16,-32,-0x40,+128" where only single bits or ranges of + * bits are cleared or set. Distinction is done based on the very + * first character which may be '+' or '-' for the relative string + * and othewise assume to be an absolute value string. If parsing fails + * a negative errno value is returned. All arguments and bitmaps are + * big endian order. + */ +static int process_mask_arg(const char *str, + unsigned long *bitmap, int bits, + struct mutex *lock) +{ + unsigned long *newmap, size; + int rc; + + /* bits needs to be a multiple of 8 */ + if (bits & 0x07) + return -EINVAL; + + size = BITS_TO_LONGS(bits)*sizeof(unsigned long); + newmap = kmalloc(size, GFP_KERNEL); + if (!newmap) + return -ENOMEM; + if (mutex_lock_interruptible(lock)) { + kfree(newmap); + return -ERESTARTSYS; + } + + if (*str == '+' || *str == '-') { + memcpy(newmap, bitmap, size); + rc = modify_bitmap(str, newmap, bits); + } else { + memset(newmap, 0, size); + rc = hex2bitmap(str, newmap, bits); + } + if (rc == 0) + memcpy(bitmap, newmap, size); + mutex_unlock(lock); + kfree(newmap); + return rc; +} + +/* + * AP bus attributes. + */ + +static ssize_t ap_domain_show(struct bus_type *bus, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); +} + +static ssize_t ap_domain_store(struct bus_type *bus, + const char *buf, size_t count) +{ + int domain; + + if (sscanf(buf, "%i\n", &domain) != 1 || + domain < 0 || domain > ap_max_domain_id || + !test_bit_inv(domain, ap_perms.aqm)) + return -EINVAL; + spin_lock_bh(&ap_domain_lock); + ap_domain_index = domain; + spin_unlock_bh(&ap_domain_lock); + + AP_DBF(DBF_DEBUG, "stored new default domain=%d\n", domain); + + return count; +} + +static BUS_ATTR_RW(ap_domain); + +static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf) +{ + if (!ap_configuration) /* QCI not supported */ + return snprintf(buf, PAGE_SIZE, "not supported\n"); + + return snprintf(buf, PAGE_SIZE, + "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", + ap_configuration->adm[0], ap_configuration->adm[1], + ap_configuration->adm[2], ap_configuration->adm[3], + ap_configuration->adm[4], ap_configuration->adm[5], + ap_configuration->adm[6], ap_configuration->adm[7]); +} + +static BUS_ATTR_RO(ap_control_domain_mask); + +static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf) +{ + if (!ap_configuration) /* QCI not supported */ + return snprintf(buf, PAGE_SIZE, "not supported\n"); + + return snprintf(buf, PAGE_SIZE, + "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", + ap_configuration->aqm[0], ap_configuration->aqm[1], + ap_configuration->aqm[2], ap_configuration->aqm[3], + ap_configuration->aqm[4], ap_configuration->aqm[5], + ap_configuration->aqm[6], ap_configuration->aqm[7]); +} + +static BUS_ATTR_RO(ap_usage_domain_mask); + +static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", + ap_using_interrupts() ? 1 : 0); +} + +static BUS_ATTR_RO(ap_interrupts); + +static ssize_t config_time_show(struct bus_type *bus, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); +} + +static ssize_t config_time_store(struct bus_type *bus, + const char *buf, size_t count) +{ + int time; + + if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) + return -EINVAL; + ap_config_time = time; + mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); + return count; +} + +static BUS_ATTR_RW(config_time); + +static ssize_t poll_thread_show(struct bus_type *bus, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); +} + +static ssize_t poll_thread_store(struct bus_type *bus, + const char *buf, size_t count) +{ + int flag, rc; + + if (sscanf(buf, "%d\n", &flag) != 1) + return -EINVAL; + if (flag) { + rc = ap_poll_thread_start(); + if (rc) + count = rc; + } else + ap_poll_thread_stop(); + return count; +} + +static BUS_ATTR_RW(poll_thread); + +static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); +} + +static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, + size_t count) +{ + unsigned long long time; + ktime_t hr_time; + + /* 120 seconds = maximum poll interval */ + if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || + time > 120000000000ULL) + return -EINVAL; + poll_timeout = time; + hr_time = poll_timeout; + + spin_lock_bh(&ap_poll_timer_lock); + hrtimer_cancel(&ap_poll_timer); + hrtimer_set_expires(&ap_poll_timer, hr_time); + hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); + spin_unlock_bh(&ap_poll_timer_lock); + + return count; +} + +static BUS_ATTR_RW(poll_timeout); + +static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf) +{ + int max_domain_id; + + if (ap_configuration) + max_domain_id = ap_max_domain_id ? : -1; + else + max_domain_id = 15; + return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id); +} + +static BUS_ATTR_RO(ap_max_domain_id); + +static ssize_t apmask_show(struct bus_type *bus, char *buf) +{ + int rc; + + if (mutex_lock_interruptible(&ap_perms_mutex)) + return -ERESTARTSYS; + rc = snprintf(buf, PAGE_SIZE, + "0x%016lx%016lx%016lx%016lx\n", + ap_perms.apm[0], ap_perms.apm[1], + ap_perms.apm[2], ap_perms.apm[3]); + mutex_unlock(&ap_perms_mutex); + + return rc; +} + +static ssize_t apmask_store(struct bus_type *bus, const char *buf, + size_t count) +{ + int rc; + + rc = process_mask_arg(buf, ap_perms.apm, AP_DEVICES, &ap_perms_mutex); + if (rc) + return rc; + + ap_bus_revise_bindings(); + + return count; +} + +static BUS_ATTR_RW(apmask); + +static ssize_t aqmask_show(struct bus_type *bus, char *buf) +{ + int rc; + + if (mutex_lock_interruptible(&ap_perms_mutex)) + return -ERESTARTSYS; + rc = snprintf(buf, PAGE_SIZE, + "0x%016lx%016lx%016lx%016lx\n", + ap_perms.aqm[0], ap_perms.aqm[1], + ap_perms.aqm[2], ap_perms.aqm[3]); + mutex_unlock(&ap_perms_mutex); + + return rc; +} + +static ssize_t aqmask_store(struct bus_type *bus, const char *buf, + size_t count) +{ + int rc; + + rc = process_mask_arg(buf, ap_perms.aqm, AP_DOMAINS, &ap_perms_mutex); + if (rc) + return rc; + + ap_bus_revise_bindings(); + + return count; +} + +static BUS_ATTR_RW(aqmask); + +static struct bus_attribute *const ap_bus_attrs[] = { + &bus_attr_ap_domain, + &bus_attr_ap_control_domain_mask, + &bus_attr_ap_usage_domain_mask, + &bus_attr_config_time, + &bus_attr_poll_thread, + &bus_attr_ap_interrupts, + &bus_attr_poll_timeout, + &bus_attr_ap_max_domain_id, + &bus_attr_apmask, + &bus_attr_aqmask, + NULL, +}; + +/** + * ap_select_domain(): Select an AP domain if possible and we haven't + * already done so before. + */ +static void ap_select_domain(void) +{ + int count, max_count, best_domain; + struct ap_queue_status status; + int i, j; + + /* + * We want to use a single domain. Either the one specified with + * the "domain=" parameter or the domain with the maximum number + * of devices. + */ + spin_lock_bh(&ap_domain_lock); + if (ap_domain_index >= 0) { + /* Domain has already been selected. */ + spin_unlock_bh(&ap_domain_lock); + return; + } + best_domain = -1; + max_count = 0; + for (i = 0; i < AP_DOMAINS; i++) { + if (!ap_test_config_domain(i) || + !test_bit_inv(i, ap_perms.aqm)) + continue; + count = 0; + for (j = 0; j < AP_DEVICES; j++) { + if (!ap_test_config_card_id(j)) + continue; + status = ap_test_queue(AP_MKQID(j, i), + ap_apft_available(), + NULL); + if (status.response_code != AP_RESPONSE_NORMAL) + continue; + count++; + } + if (count > max_count) { + max_count = count; + best_domain = i; + } + } + if (best_domain >= 0) { + ap_domain_index = best_domain; + AP_DBF(DBF_DEBUG, "new ap_domain_index=%d\n", ap_domain_index); + } + spin_unlock_bh(&ap_domain_lock); +} + +/* + * This function checks the type and returns either 0 for not + * supported or the highest compatible type value (which may + * include the input type value). + */ +static int ap_get_compatible_type(ap_qid_t qid, int rawtype, unsigned int func) +{ + int comp_type = 0; + + /* < CEX2A is not supported */ + if (rawtype < AP_DEVICE_TYPE_CEX2A) + return 0; + /* up to CEX6 known and fully supported */ + if (rawtype <= AP_DEVICE_TYPE_CEX6) + return rawtype; + /* + * unknown new type > CEX6, check for compatibility + * to the highest known and supported type which is + * currently CEX6 with the help of the QACT function. + */ + if (ap_qact_available()) { + struct ap_queue_status status; + union ap_qact_ap_info apinfo = {0}; + + apinfo.mode = (func >> 26) & 0x07; + apinfo.cat = AP_DEVICE_TYPE_CEX6; + status = ap_qact(qid, 0, &apinfo); + if (status.response_code == AP_RESPONSE_NORMAL + && apinfo.cat >= AP_DEVICE_TYPE_CEX2A + && apinfo.cat <= AP_DEVICE_TYPE_CEX6) + comp_type = apinfo.cat; + } + if (!comp_type) + AP_DBF(DBF_WARN, "queue=%02x.%04x unable to map type %d\n", + AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype); + else if (comp_type != rawtype) + AP_DBF(DBF_INFO, "queue=%02x.%04x map type %d to %d\n", + AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype, comp_type); + return comp_type; +} + +/* + * helper function to be used with bus_find_dev + * matches for the card device with the given id + */ +static int __match_card_device_with_id(struct device *dev, void *data) +{ + return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long) data; +} + +/* helper function to be used with bus_find_dev + * matches for the queue device with a given qid + */ +static int __match_queue_device_with_qid(struct device *dev, void *data) +{ + return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data; +} + +/** + * ap_scan_bus(): Scan the AP bus for new devices + * Runs periodically, workqueue timer (ap_config_time) + */ +static void ap_scan_bus(struct work_struct *unused) +{ + struct ap_queue *aq; + struct ap_card *ac; + struct device *dev; + ap_qid_t qid; + int comp_type, depth = 0, type = 0; + unsigned int func = 0; + int rc, id, dom, borked, domains, defdomdevs = 0; + + AP_DBF(DBF_DEBUG, "%s running\n", __func__); + + ap_query_configuration(ap_configuration); + ap_select_domain(); + + for (id = 0; id < AP_DEVICES; id++) { + /* check if device is registered */ + dev = bus_find_device(&ap_bus_type, NULL, + (void *)(long) id, + __match_card_device_with_id); + ac = dev ? to_ap_card(dev) : NULL; + if (!ap_test_config_card_id(id)) { + if (dev) { + /* Card device has been removed from + * configuration, remove the belonging + * queue devices. + */ + bus_for_each_dev(&ap_bus_type, NULL, + (void *)(long) id, + __ap_queue_devices_with_id_unregister); + /* now remove the card device */ + device_unregister(dev); + put_device(dev); + } + continue; + } + /* According to the configuration there should be a card + * device, so check if there is at least one valid queue + * and maybe create queue devices and the card device. + */ + domains = 0; + for (dom = 0; dom < AP_DOMAINS; dom++) { + qid = AP_MKQID(id, dom); + dev = bus_find_device(&ap_bus_type, NULL, + (void *)(long) qid, + __match_queue_device_with_qid); + aq = dev ? to_ap_queue(dev) : NULL; + if (!ap_test_config_domain(dom)) { + if (dev) { + /* Queue device exists but has been + * removed from configuration. + */ + device_unregister(dev); + put_device(dev); + } + continue; + } + rc = ap_query_queue(qid, &depth, &type, &func); + if (dev) { + spin_lock_bh(&aq->lock); + if (rc == -ENODEV || + /* adapter reconfiguration */ + (ac && ac->functions != func)) + aq->state = AP_STATE_BORKED; + borked = aq->state == AP_STATE_BORKED; + spin_unlock_bh(&aq->lock); + if (borked) /* Remove broken device */ + device_unregister(dev); + put_device(dev); + if (!borked) { + domains++; + if (dom == ap_domain_index) + defdomdevs++; + continue; + } + } + if (rc) + continue; + /* a new queue device is needed, check out comp type */ + comp_type = ap_get_compatible_type(qid, type, func); + if (!comp_type) + continue; + /* maybe a card device needs to be created first */ + if (!ac) { + ac = ap_card_create(id, depth, type, + comp_type, func); + if (!ac) + continue; + ac->ap_dev.device.bus = &ap_bus_type; + ac->ap_dev.device.parent = ap_root_device; + dev_set_name(&ac->ap_dev.device, + "card%02x", id); + /* Register card with AP bus */ + rc = device_register(&ac->ap_dev.device); + if (rc) { + put_device(&ac->ap_dev.device); + ac = NULL; + break; + } + /* get it and thus adjust reference counter */ + get_device(&ac->ap_dev.device); + } + /* now create the new queue device */ + aq = ap_queue_create(qid, comp_type); + if (!aq) + continue; + aq->card = ac; + aq->ap_dev.device.bus = &ap_bus_type; + aq->ap_dev.device.parent = &ac->ap_dev.device; + dev_set_name(&aq->ap_dev.device, + "%02x.%04x", id, dom); + /* Register device */ + rc = device_register(&aq->ap_dev.device); + if (rc) { + put_device(&aq->ap_dev.device); + continue; + } + domains++; + if (dom == ap_domain_index) + defdomdevs++; + } /* end domain loop */ + if (ac) { + /* remove card dev if there are no queue devices */ + if (!domains) + device_unregister(&ac->ap_dev.device); + put_device(&ac->ap_dev.device); + } + } /* end device loop */ + + if (ap_domain_index >= 0 && defdomdevs < 1) + AP_DBF(DBF_INFO, + "no queue device with default domain %d available\n", + ap_domain_index); + + mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); +} + +static void ap_config_timeout(struct timer_list *unused) +{ + if (ap_suspend_flag) + return; + queue_work(system_long_wq, &ap_scan_work); +} + +static int __init ap_debug_init(void) +{ + ap_dbf_info = debug_register("ap", 1, 1, + DBF_MAX_SPRINTF_ARGS * sizeof(long)); + debug_register_view(ap_dbf_info, &debug_sprintf_view); + debug_set_level(ap_dbf_info, DBF_ERR); + + return 0; +} + +static void __init ap_perms_init(void) +{ + /* all resources useable if no kernel parameter string given */ + memset(&ap_perms.apm, 0xFF, sizeof(ap_perms.apm)); + memset(&ap_perms.aqm, 0xFF, sizeof(ap_perms.aqm)); + + /* apm kernel parameter string */ + if (apm_str) { + memset(&ap_perms.apm, 0, sizeof(ap_perms.apm)); + process_mask_arg(apm_str, ap_perms.apm, AP_DEVICES, + &ap_perms_mutex); + } + + /* aqm kernel parameter string */ + if (aqm_str) { + memset(&ap_perms.aqm, 0, sizeof(ap_perms.aqm)); + process_mask_arg(aqm_str, ap_perms.aqm, AP_DOMAINS, + &ap_perms_mutex); + } +} + +/** + * ap_module_init(): The module initialization code. + * + * Initializes the module. + */ +static int __init ap_module_init(void) +{ + int max_domain_id; + int rc, i; + + rc = ap_debug_init(); + if (rc) + return rc; + + if (!ap_instructions_available()) { + pr_warn("The hardware system does not support AP instructions\n"); + return -ENODEV; + } + + /* set up the AP permissions (ap and aq masks) */ + ap_perms_init(); + + /* Get AP configuration data if available */ + ap_init_configuration(); + + if (ap_configuration) + max_domain_id = + ap_max_domain_id ? ap_max_domain_id : AP_DOMAINS - 1; + else + max_domain_id = 15; + if (ap_domain_index < -1 || ap_domain_index > max_domain_id || + (ap_domain_index >= 0 && + !test_bit_inv(ap_domain_index, ap_perms.aqm))) { + pr_warn("%d is not a valid cryptographic domain\n", + ap_domain_index); + ap_domain_index = -1; + } + /* In resume callback we need to know if the user had set the domain. + * If so, we can not just reset it. + */ + if (ap_domain_index >= 0) + user_set_domain = 1; + + if (ap_interrupts_available()) { + rc = register_adapter_interrupt(&ap_airq); + ap_airq_flag = (rc == 0); + } + + /* Create /sys/bus/ap. */ + rc = bus_register(&ap_bus_type); + if (rc) + goto out; + for (i = 0; ap_bus_attrs[i]; i++) { + rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); + if (rc) + goto out_bus; + } + + /* Create /sys/devices/ap. */ + ap_root_device = root_device_register("ap"); + rc = PTR_ERR_OR_ZERO(ap_root_device); + if (rc) + goto out_bus; + + /* Setup the AP bus rescan timer. */ + timer_setup(&ap_config_timer, ap_config_timeout, 0); + + /* + * Setup the high resultion poll timer. + * If we are running under z/VM adjust polling to z/VM polling rate. + */ + if (MACHINE_IS_VM) + poll_timeout = 1500000; + spin_lock_init(&ap_poll_timer_lock); + hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + ap_poll_timer.function = ap_poll_timeout; + + /* Start the low priority AP bus poll thread. */ + if (ap_thread_flag) { + rc = ap_poll_thread_start(); + if (rc) + goto out_work; + } + + rc = register_pm_notifier(&ap_power_notifier); + if (rc) + goto out_pm; + + queue_work(system_long_wq, &ap_scan_work); + initialised = true; + + return 0; + +out_pm: + ap_poll_thread_stop(); +out_work: + hrtimer_cancel(&ap_poll_timer); + root_device_unregister(ap_root_device); +out_bus: + while (i--) + bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); + bus_unregister(&ap_bus_type); +out: + if (ap_using_interrupts()) + unregister_adapter_interrupt(&ap_airq); + kfree(ap_configuration); + return rc; +} +device_initcall(ap_module_init); diff --git a/drivers/s390/crypto/ap_bus.h b/drivers/s390/crypto/ap_bus.h new file mode 100644 index 000000000..1c799ddd9 --- /dev/null +++ b/drivers/s390/crypto/ap_bus.h @@ -0,0 +1,284 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright IBM Corp. 2006, 2012 + * Author(s): Cornelia Huck + * Martin Schwidefsky + * Ralph Wuerthner + * Felix Beck + * Holger Dengler + * + * Adjunct processor bus header file. + */ + +#ifndef _AP_BUS_H_ +#define _AP_BUS_H_ + +#include +#include +#include +#include + +#define AP_DEVICES 256 /* Number of AP devices. */ +#define AP_DOMAINS 256 /* Number of AP domains. */ +#define AP_RESET_TIMEOUT (HZ*0.7) /* Time in ticks for reset timeouts. */ +#define AP_CONFIG_TIME 30 /* Time in seconds between AP bus rescans. */ +#define AP_POLL_TIME 1 /* Time in ticks between receive polls. */ + +extern int ap_domain_index; + +extern spinlock_t ap_list_lock; +extern struct list_head ap_card_list; + +static inline int ap_test_bit(unsigned int *ptr, unsigned int nr) +{ + return (*ptr & (0x80000000u >> nr)) != 0; +} + +#define AP_RESPONSE_NORMAL 0x00 +#define AP_RESPONSE_Q_NOT_AVAIL 0x01 +#define AP_RESPONSE_RESET_IN_PROGRESS 0x02 +#define AP_RESPONSE_DECONFIGURED 0x03 +#define AP_RESPONSE_CHECKSTOPPED 0x04 +#define AP_RESPONSE_BUSY 0x05 +#define AP_RESPONSE_INVALID_ADDRESS 0x06 +#define AP_RESPONSE_OTHERWISE_CHANGED 0x07 +#define AP_RESPONSE_Q_FULL 0x10 +#define AP_RESPONSE_NO_PENDING_REPLY 0x10 +#define AP_RESPONSE_INDEX_TOO_BIG 0x11 +#define AP_RESPONSE_NO_FIRST_PART 0x13 +#define AP_RESPONSE_MESSAGE_TOO_BIG 0x15 +#define AP_RESPONSE_REQ_FAC_NOT_INST 0x16 + +/* + * Known device types + */ +#define AP_DEVICE_TYPE_PCICC 3 +#define AP_DEVICE_TYPE_PCICA 4 +#define AP_DEVICE_TYPE_PCIXCC 5 +#define AP_DEVICE_TYPE_CEX2A 6 +#define AP_DEVICE_TYPE_CEX2C 7 +#define AP_DEVICE_TYPE_CEX3A 8 +#define AP_DEVICE_TYPE_CEX3C 9 +#define AP_DEVICE_TYPE_CEX4 10 +#define AP_DEVICE_TYPE_CEX5 11 +#define AP_DEVICE_TYPE_CEX6 12 + +/* + * Known function facilities + */ +#define AP_FUNC_MEX4K 1 +#define AP_FUNC_CRT4K 2 +#define AP_FUNC_COPRO 3 +#define AP_FUNC_ACCEL 4 +#define AP_FUNC_EP11 5 +#define AP_FUNC_APXA 6 + +/* + * AP interrupt states + */ +#define AP_INTR_DISABLED 0 /* AP interrupt disabled */ +#define AP_INTR_ENABLED 1 /* AP interrupt enabled */ + +/* + * AP device states + */ +enum ap_state { + AP_STATE_RESET_START, + AP_STATE_RESET_WAIT, + AP_STATE_SETIRQ_WAIT, + AP_STATE_IDLE, + AP_STATE_WORKING, + AP_STATE_QUEUE_FULL, + AP_STATE_SUSPEND_WAIT, + AP_STATE_BORKED, + NR_AP_STATES +}; + +/* + * AP device events + */ +enum ap_event { + AP_EVENT_POLL, + AP_EVENT_TIMEOUT, + NR_AP_EVENTS +}; + +/* + * AP wait behaviour + */ +enum ap_wait { + AP_WAIT_AGAIN, /* retry immediately */ + AP_WAIT_TIMEOUT, /* wait for timeout */ + AP_WAIT_INTERRUPT, /* wait for thin interrupt (if available) */ + AP_WAIT_NONE, /* no wait */ + NR_AP_WAIT +}; + +struct ap_device; +struct ap_message; + +/* + * The ap driver struct includes a flags field which holds some info for + * the ap bus about the driver. Currently only one flag is supported and + * used: The DEFAULT flag marks an ap driver as a default driver which is + * used together with the apmask and aqmask whitelisting of the ap bus. + */ +#define AP_DRIVER_FLAG_DEFAULT 0x0001 + +struct ap_driver { + struct device_driver driver; + struct ap_device_id *ids; + unsigned int flags; + + int (*probe)(struct ap_device *); + void (*remove)(struct ap_device *); + void (*suspend)(struct ap_device *); + void (*resume)(struct ap_device *); +}; + +#define to_ap_drv(x) container_of((x), struct ap_driver, driver) + +int ap_driver_register(struct ap_driver *, struct module *, char *); +void ap_driver_unregister(struct ap_driver *); + +struct ap_device { + struct device device; + struct ap_driver *drv; /* Pointer to AP device driver. */ + int device_type; /* AP device type. */ +}; + +#define to_ap_dev(x) container_of((x), struct ap_device, device) + +struct ap_card { + struct ap_device ap_dev; + struct list_head list; /* Private list of AP cards. */ + struct list_head queues; /* List of assoc. AP queues */ + void *private; /* ap driver private pointer. */ + int raw_hwtype; /* AP raw hardware type. */ + unsigned int functions; /* AP device function bitfield. */ + int queue_depth; /* AP queue depth.*/ + int id; /* AP card number. */ + atomic64_t total_request_count; /* # requests ever for this AP device.*/ +}; + +#define to_ap_card(x) container_of((x), struct ap_card, ap_dev.device) + +struct ap_queue { + struct ap_device ap_dev; + struct list_head list; /* Private list of AP queues. */ + struct ap_card *card; /* Ptr to assoc. AP card. */ + spinlock_t lock; /* Per device lock. */ + void *private; /* ap driver private pointer. */ + ap_qid_t qid; /* AP queue id. */ + int interrupt; /* indicate if interrupts are enabled */ + int queue_count; /* # messages currently on AP queue. */ + enum ap_state state; /* State of the AP device. */ + int pendingq_count; /* # requests on pendingq list. */ + int requestq_count; /* # requests on requestq list. */ + u64 total_request_count; /* # requests ever for this AP device.*/ + int request_timeout; /* Request timeout in jiffies. */ + struct timer_list timeout; /* Timer for request timeouts. */ + struct list_head pendingq; /* List of message sent to AP queue. */ + struct list_head requestq; /* List of message yet to be sent. */ + struct ap_message *reply; /* Per device reply message. */ +}; + +#define to_ap_queue(x) container_of((x), struct ap_queue, ap_dev.device) + +typedef enum ap_wait (ap_func_t)(struct ap_queue *queue); + +struct ap_message { + struct list_head list; /* Request queueing. */ + unsigned long long psmid; /* Message id. */ + void *message; /* Pointer to message buffer. */ + size_t length; /* Message length. */ + int rc; /* Return code for this message */ + + void *private; /* ap driver private pointer. */ + unsigned int special:1; /* Used for special commands. */ + /* receive is called from tasklet context */ + void (*receive)(struct ap_queue *, struct ap_message *, + struct ap_message *); +}; + +/** + * ap_init_message() - Initialize ap_message. + * Initialize a message before using. Otherwise this might result in + * unexpected behaviour. + */ +static inline void ap_init_message(struct ap_message *ap_msg) +{ + memset(ap_msg, 0, sizeof(*ap_msg)); +} + +/** + * ap_release_message() - Release ap_message. + * Releases all memory used internal within the ap_message struct + * Currently this is the message and private field. + */ +static inline void ap_release_message(struct ap_message *ap_msg) +{ + kzfree(ap_msg->message); + kzfree(ap_msg->private); +} + +#define for_each_ap_card(_ac) \ + list_for_each_entry(_ac, &ap_card_list, list) + +#define for_each_ap_queue(_aq, _ac) \ + list_for_each_entry(_aq, &(_ac)->queues, list) + +/* + * Note: don't use ap_send/ap_recv after using ap_queue_message + * for the first time. Otherwise the ap message queue will get + * confused. + */ +int ap_send(ap_qid_t, unsigned long long, void *, size_t); +int ap_recv(ap_qid_t, unsigned long long *, void *, size_t); + +enum ap_wait ap_sm_event(struct ap_queue *aq, enum ap_event event); +enum ap_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_event event); + +void ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg); +void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg); +void ap_flush_queue(struct ap_queue *aq); + +void *ap_airq_ptr(void); +void ap_wait(enum ap_wait wait); +void ap_request_timeout(struct timer_list *t); +void ap_bus_force_rescan(void); + +void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *ap_msg); +struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type); +void ap_queue_remove(struct ap_queue *aq); +void ap_queue_suspend(struct ap_device *ap_dev); +void ap_queue_resume(struct ap_device *ap_dev); +void ap_queue_reinit_state(struct ap_queue *aq); + +struct ap_card *ap_card_create(int id, int queue_depth, int raw_device_type, + int comp_device_type, unsigned int functions); + +/* + * check APQN for owned/reserved by ap bus and default driver(s). + * Checks if this APQN is or will be in use by the ap bus + * and the default set of drivers. + * If yes, returns 1, if not returns 0. On error a negative + * errno value is returned. + */ +int ap_owned_by_def_drv(int card, int queue); + +/* + * check 'matrix' of APQNs for owned/reserved by ap bus and + * default driver(s). + * Checks if there is at least one APQN in the given 'matrix' + * marked as owned/reserved by the ap bus and default driver(s). + * If such an APQN is found the return value is 1, otherwise + * 0 is returned. On error a negative errno value is returned. + * The parameter apm is a bitmask which should be declared + * as DECLARE_BITMAP(apm, AP_DEVICES), the aqm parameter is + * similar, should be declared as DECLARE_BITMAP(aqm, AP_DOMAINS). + */ +int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm, + unsigned long *aqm); + +#endif /* _AP_BUS_H_ */ diff --git a/drivers/s390/crypto/ap_card.c b/drivers/s390/crypto/ap_card.c new file mode 100644 index 000000000..e85bfca1e --- /dev/null +++ b/drivers/s390/crypto/ap_card.c @@ -0,0 +1,191 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2016 + * Author(s): Martin Schwidefsky + * + * Adjunct processor bus, card related code. + */ + +#define KMSG_COMPONENT "ap" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include + +#include "ap_bus.h" + +/* + * AP card related attributes. + */ +static ssize_t hwtype_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ap_card *ac = to_ap_card(dev); + + return snprintf(buf, PAGE_SIZE, "%d\n", ac->ap_dev.device_type); +} + +static DEVICE_ATTR_RO(hwtype); + +static ssize_t raw_hwtype_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ap_card *ac = to_ap_card(dev); + + return snprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype); +} + +static DEVICE_ATTR_RO(raw_hwtype); + +static ssize_t depth_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct ap_card *ac = to_ap_card(dev); + + return snprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth); +} + +static DEVICE_ATTR_RO(depth); + +static ssize_t ap_functions_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ap_card *ac = to_ap_card(dev); + + return snprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions); +} + +static DEVICE_ATTR_RO(ap_functions); + +static ssize_t request_count_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ap_card *ac = to_ap_card(dev); + u64 req_cnt; + + req_cnt = 0; + spin_lock_bh(&ap_list_lock); + req_cnt = atomic64_read(&ac->total_request_count); + spin_unlock_bh(&ap_list_lock); + return snprintf(buf, PAGE_SIZE, "%llu\n", req_cnt); +} + +static ssize_t request_count_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ap_card *ac = to_ap_card(dev); + struct ap_queue *aq; + + spin_lock_bh(&ap_list_lock); + for_each_ap_queue(aq, ac) + aq->total_request_count = 0; + spin_unlock_bh(&ap_list_lock); + atomic64_set(&ac->total_request_count, 0); + + return count; +} + +static DEVICE_ATTR_RW(request_count); + +static ssize_t requestq_count_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ap_card *ac = to_ap_card(dev); + struct ap_queue *aq; + unsigned int reqq_cnt; + + reqq_cnt = 0; + spin_lock_bh(&ap_list_lock); + for_each_ap_queue(aq, ac) + reqq_cnt += aq->requestq_count; + spin_unlock_bh(&ap_list_lock); + return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt); +} + +static DEVICE_ATTR_RO(requestq_count); + +static ssize_t pendingq_count_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ap_card *ac = to_ap_card(dev); + struct ap_queue *aq; + unsigned int penq_cnt; + + penq_cnt = 0; + spin_lock_bh(&ap_list_lock); + for_each_ap_queue(aq, ac) + penq_cnt += aq->pendingq_count; + spin_unlock_bh(&ap_list_lock); + return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt); +} + +static DEVICE_ATTR_RO(pendingq_count); + +static ssize_t modalias_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type); +} + +static DEVICE_ATTR_RO(modalias); + +static struct attribute *ap_card_dev_attrs[] = { + &dev_attr_hwtype.attr, + &dev_attr_raw_hwtype.attr, + &dev_attr_depth.attr, + &dev_attr_ap_functions.attr, + &dev_attr_request_count.attr, + &dev_attr_requestq_count.attr, + &dev_attr_pendingq_count.attr, + &dev_attr_modalias.attr, + NULL +}; + +static struct attribute_group ap_card_dev_attr_group = { + .attrs = ap_card_dev_attrs +}; + +static const struct attribute_group *ap_card_dev_attr_groups[] = { + &ap_card_dev_attr_group, + NULL +}; + +static struct device_type ap_card_type = { + .name = "ap_card", + .groups = ap_card_dev_attr_groups, +}; + +static void ap_card_device_release(struct device *dev) +{ + struct ap_card *ac = to_ap_card(dev); + + if (!list_empty(&ac->list)) { + spin_lock_bh(&ap_list_lock); + list_del_init(&ac->list); + spin_unlock_bh(&ap_list_lock); + } + kfree(ac); +} + +struct ap_card *ap_card_create(int id, int queue_depth, int raw_type, + int comp_type, unsigned int functions) +{ + struct ap_card *ac; + + ac = kzalloc(sizeof(*ac), GFP_KERNEL); + if (!ac) + return NULL; + INIT_LIST_HEAD(&ac->list); + INIT_LIST_HEAD(&ac->queues); + ac->ap_dev.device.release = ap_card_device_release; + ac->ap_dev.device.type = &ap_card_type; + ac->ap_dev.device_type = comp_type; + ac->raw_hwtype = raw_type; + ac->queue_depth = queue_depth; + ac->functions = functions; + ac->id = id; + return ac; +} diff --git a/drivers/s390/crypto/ap_debug.h b/drivers/s390/crypto/ap_debug.h new file mode 100644 index 000000000..dc675eb5a --- /dev/null +++ b/drivers/s390/crypto/ap_debug.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2016 + * Author(s): Harald Freudenberger + */ +#ifndef AP_DEBUG_H +#define AP_DEBUG_H + +#include + +#define DBF_ERR 3 /* error conditions */ +#define DBF_WARN 4 /* warning conditions */ +#define DBF_INFO 5 /* informational */ +#define DBF_DEBUG 6 /* for debugging only */ + +#define RC2ERR(rc) ((rc) ? DBF_ERR : DBF_INFO) +#define RC2WARN(rc) ((rc) ? DBF_WARN : DBF_INFO) + +#define DBF_MAX_SPRINTF_ARGS 5 + +#define AP_DBF(...) \ + debug_sprintf_event(ap_dbf_info, ##__VA_ARGS__) + +extern debug_info_t *ap_dbf_info; + +#endif /* AP_DEBUG_H */ diff --git a/drivers/s390/crypto/ap_queue.c b/drivers/s390/crypto/ap_queue.c new file mode 100644 index 000000000..e1647da12 --- /dev/null +++ b/drivers/s390/crypto/ap_queue.c @@ -0,0 +1,758 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2016 + * Author(s): Martin Schwidefsky + * + * Adjunct processor bus, queue related code. + */ + +#define KMSG_COMPONENT "ap" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include + +#include "ap_bus.h" +#include "ap_debug.h" + +static void __ap_flush_queue(struct ap_queue *aq); + +/** + * ap_queue_enable_interruption(): Enable interruption on an AP queue. + * @qid: The AP queue number + * @ind: the notification indicator byte + * + * Enables interruption on AP queue via ap_aqic(). Based on the return + * value it waits a while and tests the AP queue if interrupts + * have been switched on using ap_test_queue(). + */ +static int ap_queue_enable_interruption(struct ap_queue *aq, void *ind) +{ + struct ap_queue_status status; + struct ap_qirq_ctrl qirqctrl = { 0 }; + + qirqctrl.ir = 1; + qirqctrl.isc = AP_ISC; + status = ap_aqic(aq->qid, qirqctrl, ind); + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + case AP_RESPONSE_OTHERWISE_CHANGED: + return 0; + case AP_RESPONSE_Q_NOT_AVAIL: + case AP_RESPONSE_DECONFIGURED: + case AP_RESPONSE_CHECKSTOPPED: + case AP_RESPONSE_INVALID_ADDRESS: + pr_err("Registering adapter interrupts for AP device %02x.%04x failed\n", + AP_QID_CARD(aq->qid), + AP_QID_QUEUE(aq->qid)); + return -EOPNOTSUPP; + case AP_RESPONSE_RESET_IN_PROGRESS: + case AP_RESPONSE_BUSY: + default: + return -EBUSY; + } +} + +/** + * __ap_send(): Send message to adjunct processor queue. + * @qid: The AP queue number + * @psmid: The program supplied message identifier + * @msg: The message text + * @length: The message length + * @special: Special Bit + * + * Returns AP queue status structure. + * Condition code 1 on NQAP can't happen because the L bit is 1. + * Condition code 2 on NQAP also means the send is incomplete, + * because a segment boundary was reached. The NQAP is repeated. + */ +static inline struct ap_queue_status +__ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, + unsigned int special) +{ + if (special == 1) + qid |= 0x400000UL; + return ap_nqap(qid, psmid, msg, length); +} + +int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) +{ + struct ap_queue_status status; + + status = __ap_send(qid, psmid, msg, length, 0); + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + return 0; + case AP_RESPONSE_Q_FULL: + case AP_RESPONSE_RESET_IN_PROGRESS: + return -EBUSY; + case AP_RESPONSE_REQ_FAC_NOT_INST: + return -EINVAL; + default: /* Device is gone. */ + return -ENODEV; + } +} +EXPORT_SYMBOL(ap_send); + +int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) +{ + struct ap_queue_status status; + + if (msg == NULL) + return -EINVAL; + status = ap_dqap(qid, psmid, msg, length); + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + return 0; + case AP_RESPONSE_NO_PENDING_REPLY: + if (status.queue_empty) + return -ENOENT; + return -EBUSY; + case AP_RESPONSE_RESET_IN_PROGRESS: + return -EBUSY; + default: + return -ENODEV; + } +} +EXPORT_SYMBOL(ap_recv); + +/* State machine definitions and helpers */ + +static enum ap_wait ap_sm_nop(struct ap_queue *aq) +{ + return AP_WAIT_NONE; +} + +/** + * ap_sm_recv(): Receive pending reply messages from an AP queue but do + * not change the state of the device. + * @aq: pointer to the AP queue + * + * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT + */ +static struct ap_queue_status ap_sm_recv(struct ap_queue *aq) +{ + struct ap_queue_status status; + struct ap_message *ap_msg; + + status = ap_dqap(aq->qid, &aq->reply->psmid, + aq->reply->message, aq->reply->length); + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + aq->queue_count--; + if (aq->queue_count > 0) + mod_timer(&aq->timeout, + jiffies + aq->request_timeout); + list_for_each_entry(ap_msg, &aq->pendingq, list) { + if (ap_msg->psmid != aq->reply->psmid) + continue; + list_del_init(&ap_msg->list); + aq->pendingq_count--; + ap_msg->receive(aq, ap_msg, aq->reply); + break; + } + case AP_RESPONSE_NO_PENDING_REPLY: + if (!status.queue_empty || aq->queue_count <= 0) + break; + /* The card shouldn't forget requests but who knows. */ + aq->queue_count = 0; + list_splice_init(&aq->pendingq, &aq->requestq); + aq->requestq_count += aq->pendingq_count; + aq->pendingq_count = 0; + break; + default: + break; + } + return status; +} + +/** + * ap_sm_read(): Receive pending reply messages from an AP queue. + * @aq: pointer to the AP queue + * + * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT + */ +static enum ap_wait ap_sm_read(struct ap_queue *aq) +{ + struct ap_queue_status status; + + if (!aq->reply) + return AP_WAIT_NONE; + status = ap_sm_recv(aq); + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + if (aq->queue_count > 0) { + aq->state = AP_STATE_WORKING; + return AP_WAIT_AGAIN; + } + aq->state = AP_STATE_IDLE; + return AP_WAIT_NONE; + case AP_RESPONSE_NO_PENDING_REPLY: + if (aq->queue_count > 0) + return AP_WAIT_INTERRUPT; + aq->state = AP_STATE_IDLE; + return AP_WAIT_NONE; + default: + aq->state = AP_STATE_BORKED; + return AP_WAIT_NONE; + } +} + +/** + * ap_sm_suspend_read(): Receive pending reply messages from an AP queue + * without changing the device state in between. In suspend mode we don't + * allow sending new requests, therefore just fetch pending replies. + * @aq: pointer to the AP queue + * + * Returns AP_WAIT_NONE or AP_WAIT_AGAIN + */ +static enum ap_wait ap_sm_suspend_read(struct ap_queue *aq) +{ + struct ap_queue_status status; + + if (!aq->reply) + return AP_WAIT_NONE; + status = ap_sm_recv(aq); + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + if (aq->queue_count > 0) + return AP_WAIT_AGAIN; + /* fall through */ + default: + return AP_WAIT_NONE; + } +} + +/** + * ap_sm_write(): Send messages from the request queue to an AP queue. + * @aq: pointer to the AP queue + * + * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT + */ +static enum ap_wait ap_sm_write(struct ap_queue *aq) +{ + struct ap_queue_status status; + struct ap_message *ap_msg; + + if (aq->requestq_count <= 0) + return AP_WAIT_NONE; + /* Start the next request on the queue. */ + ap_msg = list_entry(aq->requestq.next, struct ap_message, list); + status = __ap_send(aq->qid, ap_msg->psmid, + ap_msg->message, ap_msg->length, ap_msg->special); + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + aq->queue_count++; + if (aq->queue_count == 1) + mod_timer(&aq->timeout, jiffies + aq->request_timeout); + list_move_tail(&ap_msg->list, &aq->pendingq); + aq->requestq_count--; + aq->pendingq_count++; + if (aq->queue_count < aq->card->queue_depth) { + aq->state = AP_STATE_WORKING; + return AP_WAIT_AGAIN; + } + /* fall through */ + case AP_RESPONSE_Q_FULL: + aq->state = AP_STATE_QUEUE_FULL; + return AP_WAIT_INTERRUPT; + case AP_RESPONSE_RESET_IN_PROGRESS: + aq->state = AP_STATE_RESET_WAIT; + return AP_WAIT_TIMEOUT; + case AP_RESPONSE_MESSAGE_TOO_BIG: + case AP_RESPONSE_REQ_FAC_NOT_INST: + list_del_init(&ap_msg->list); + aq->requestq_count--; + ap_msg->rc = -EINVAL; + ap_msg->receive(aq, ap_msg, NULL); + return AP_WAIT_AGAIN; + default: + aq->state = AP_STATE_BORKED; + return AP_WAIT_NONE; + } +} + +/** + * ap_sm_read_write(): Send and receive messages to/from an AP queue. + * @aq: pointer to the AP queue + * + * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT + */ +static enum ap_wait ap_sm_read_write(struct ap_queue *aq) +{ + return min(ap_sm_read(aq), ap_sm_write(aq)); +} + +/** + * ap_sm_reset(): Reset an AP queue. + * @qid: The AP queue number + * + * Submit the Reset command to an AP queue. + */ +static enum ap_wait ap_sm_reset(struct ap_queue *aq) +{ + struct ap_queue_status status; + + status = ap_rapq(aq->qid); + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + case AP_RESPONSE_RESET_IN_PROGRESS: + aq->state = AP_STATE_RESET_WAIT; + aq->interrupt = AP_INTR_DISABLED; + return AP_WAIT_TIMEOUT; + case AP_RESPONSE_BUSY: + return AP_WAIT_TIMEOUT; + case AP_RESPONSE_Q_NOT_AVAIL: + case AP_RESPONSE_DECONFIGURED: + case AP_RESPONSE_CHECKSTOPPED: + default: + aq->state = AP_STATE_BORKED; + return AP_WAIT_NONE; + } +} + +/** + * ap_sm_reset_wait(): Test queue for completion of the reset operation + * @aq: pointer to the AP queue + * + * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0. + */ +static enum ap_wait ap_sm_reset_wait(struct ap_queue *aq) +{ + struct ap_queue_status status; + void *lsi_ptr; + + if (aq->queue_count > 0 && aq->reply) + /* Try to read a completed message and get the status */ + status = ap_sm_recv(aq); + else + /* Get the status with TAPQ */ + status = ap_tapq(aq->qid, NULL); + + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + lsi_ptr = ap_airq_ptr(); + if (lsi_ptr && ap_queue_enable_interruption(aq, lsi_ptr) == 0) + aq->state = AP_STATE_SETIRQ_WAIT; + else + aq->state = (aq->queue_count > 0) ? + AP_STATE_WORKING : AP_STATE_IDLE; + return AP_WAIT_AGAIN; + case AP_RESPONSE_BUSY: + case AP_RESPONSE_RESET_IN_PROGRESS: + return AP_WAIT_TIMEOUT; + case AP_RESPONSE_Q_NOT_AVAIL: + case AP_RESPONSE_DECONFIGURED: + case AP_RESPONSE_CHECKSTOPPED: + default: + aq->state = AP_STATE_BORKED; + return AP_WAIT_NONE; + } +} + +/** + * ap_sm_setirq_wait(): Test queue for completion of the irq enablement + * @aq: pointer to the AP queue + * + * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0. + */ +static enum ap_wait ap_sm_setirq_wait(struct ap_queue *aq) +{ + struct ap_queue_status status; + + if (aq->queue_count > 0 && aq->reply) + /* Try to read a completed message and get the status */ + status = ap_sm_recv(aq); + else + /* Get the status with TAPQ */ + status = ap_tapq(aq->qid, NULL); + + if (status.irq_enabled == 1) { + /* Irqs are now enabled */ + aq->interrupt = AP_INTR_ENABLED; + aq->state = (aq->queue_count > 0) ? + AP_STATE_WORKING : AP_STATE_IDLE; + } + + switch (status.response_code) { + case AP_RESPONSE_NORMAL: + if (aq->queue_count > 0) + return AP_WAIT_AGAIN; + /* fallthrough */ + case AP_RESPONSE_NO_PENDING_REPLY: + return AP_WAIT_TIMEOUT; + default: + aq->state = AP_STATE_BORKED; + return AP_WAIT_NONE; + } +} + +/* + * AP state machine jump table + */ +static ap_func_t *ap_jumptable[NR_AP_STATES][NR_AP_EVENTS] = { + [AP_STATE_RESET_START] = { + [AP_EVENT_POLL] = ap_sm_reset, + [AP_EVENT_TIMEOUT] = ap_sm_nop, + }, + [AP_STATE_RESET_WAIT] = { + [AP_EVENT_POLL] = ap_sm_reset_wait, + [AP_EVENT_TIMEOUT] = ap_sm_nop, + }, + [AP_STATE_SETIRQ_WAIT] = { + [AP_EVENT_POLL] = ap_sm_setirq_wait, + [AP_EVENT_TIMEOUT] = ap_sm_nop, + }, + [AP_STATE_IDLE] = { + [AP_EVENT_POLL] = ap_sm_write, + [AP_EVENT_TIMEOUT] = ap_sm_nop, + }, + [AP_STATE_WORKING] = { + [AP_EVENT_POLL] = ap_sm_read_write, + [AP_EVENT_TIMEOUT] = ap_sm_reset, + }, + [AP_STATE_QUEUE_FULL] = { + [AP_EVENT_POLL] = ap_sm_read, + [AP_EVENT_TIMEOUT] = ap_sm_reset, + }, + [AP_STATE_SUSPEND_WAIT] = { + [AP_EVENT_POLL] = ap_sm_suspend_read, + [AP_EVENT_TIMEOUT] = ap_sm_nop, + }, + [AP_STATE_BORKED] = { + [AP_EVENT_POLL] = ap_sm_nop, + [AP_EVENT_TIMEOUT] = ap_sm_nop, + }, +}; + +enum ap_wait ap_sm_event(struct ap_queue *aq, enum ap_event event) +{ + return ap_jumptable[aq->state][event](aq); +} + +enum ap_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_event event) +{ + enum ap_wait wait; + + while ((wait = ap_sm_event(aq, event)) == AP_WAIT_AGAIN) + ; + return wait; +} + +/* + * Power management for queue devices + */ +void ap_queue_suspend(struct ap_device *ap_dev) +{ + struct ap_queue *aq = to_ap_queue(&ap_dev->device); + + /* Poll on the device until all requests are finished. */ + spin_lock_bh(&aq->lock); + aq->state = AP_STATE_SUSPEND_WAIT; + while (ap_sm_event(aq, AP_EVENT_POLL) != AP_WAIT_NONE) + ; + aq->state = AP_STATE_BORKED; + spin_unlock_bh(&aq->lock); +} +EXPORT_SYMBOL(ap_queue_suspend); + +void ap_queue_resume(struct ap_device *ap_dev) +{ +} +EXPORT_SYMBOL(ap_queue_resume); + +/* + * AP queue related attributes. + */ +static ssize_t request_count_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ap_queue *aq = to_ap_queue(dev); + u64 req_cnt; + + spin_lock_bh(&aq->lock); + req_cnt = aq->total_request_count; + spin_unlock_bh(&aq->lock); + return snprintf(buf, PAGE_SIZE, "%llu\n", req_cnt); +} + +static ssize_t request_count_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ap_queue *aq = to_ap_queue(dev); + + spin_lock_bh(&aq->lock); + aq->total_request_count = 0; + spin_unlock_bh(&aq->lock); + + return count; +} + +static DEVICE_ATTR_RW(request_count); + +static ssize_t requestq_count_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ap_queue *aq = to_ap_queue(dev); + unsigned int reqq_cnt = 0; + + spin_lock_bh(&aq->lock); + reqq_cnt = aq->requestq_count; + spin_unlock_bh(&aq->lock); + return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt); +} + +static DEVICE_ATTR_RO(requestq_count); + +static ssize_t pendingq_count_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ap_queue *aq = to_ap_queue(dev); + unsigned int penq_cnt = 0; + + spin_lock_bh(&aq->lock); + penq_cnt = aq->pendingq_count; + spin_unlock_bh(&aq->lock); + return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt); +} + +static DEVICE_ATTR_RO(pendingq_count); + +static ssize_t reset_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ap_queue *aq = to_ap_queue(dev); + int rc = 0; + + spin_lock_bh(&aq->lock); + switch (aq->state) { + case AP_STATE_RESET_START: + case AP_STATE_RESET_WAIT: + rc = snprintf(buf, PAGE_SIZE, "Reset in progress.\n"); + break; + case AP_STATE_WORKING: + case AP_STATE_QUEUE_FULL: + rc = snprintf(buf, PAGE_SIZE, "Reset Timer armed.\n"); + break; + default: + rc = snprintf(buf, PAGE_SIZE, "No Reset Timer set.\n"); + } + spin_unlock_bh(&aq->lock); + return rc; +} + +static ssize_t reset_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ap_queue *aq = to_ap_queue(dev); + + spin_lock_bh(&aq->lock); + __ap_flush_queue(aq); + aq->state = AP_STATE_RESET_START; + ap_wait(ap_sm_event(aq, AP_EVENT_POLL)); + spin_unlock_bh(&aq->lock); + + AP_DBF(DBF_INFO, "reset queue=%02x.%04x triggered by user\n", + AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid)); + + return count; +} + +static DEVICE_ATTR_RW(reset); + +static ssize_t interrupt_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ap_queue *aq = to_ap_queue(dev); + int rc = 0; + + spin_lock_bh(&aq->lock); + if (aq->state == AP_STATE_SETIRQ_WAIT) + rc = snprintf(buf, PAGE_SIZE, "Enable Interrupt pending.\n"); + else if (aq->interrupt == AP_INTR_ENABLED) + rc = snprintf(buf, PAGE_SIZE, "Interrupts enabled.\n"); + else + rc = snprintf(buf, PAGE_SIZE, "Interrupts disabled.\n"); + spin_unlock_bh(&aq->lock); + return rc; +} + +static DEVICE_ATTR_RO(interrupt); + +static struct attribute *ap_queue_dev_attrs[] = { + &dev_attr_request_count.attr, + &dev_attr_requestq_count.attr, + &dev_attr_pendingq_count.attr, + &dev_attr_reset.attr, + &dev_attr_interrupt.attr, + NULL +}; + +static struct attribute_group ap_queue_dev_attr_group = { + .attrs = ap_queue_dev_attrs +}; + +static const struct attribute_group *ap_queue_dev_attr_groups[] = { + &ap_queue_dev_attr_group, + NULL +}; + +static struct device_type ap_queue_type = { + .name = "ap_queue", + .groups = ap_queue_dev_attr_groups, +}; + +static void ap_queue_device_release(struct device *dev) +{ + struct ap_queue *aq = to_ap_queue(dev); + + if (!list_empty(&aq->list)) { + spin_lock_bh(&ap_list_lock); + list_del_init(&aq->list); + spin_unlock_bh(&ap_list_lock); + } + kfree(aq); +} + +struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type) +{ + struct ap_queue *aq; + + aq = kzalloc(sizeof(*aq), GFP_KERNEL); + if (!aq) + return NULL; + aq->ap_dev.device.release = ap_queue_device_release; + aq->ap_dev.device.type = &ap_queue_type; + aq->ap_dev.device_type = device_type; + aq->qid = qid; + aq->state = AP_STATE_RESET_START; + aq->interrupt = AP_INTR_DISABLED; + spin_lock_init(&aq->lock); + INIT_LIST_HEAD(&aq->list); + INIT_LIST_HEAD(&aq->pendingq); + INIT_LIST_HEAD(&aq->requestq); + timer_setup(&aq->timeout, ap_request_timeout, 0); + + return aq; +} + +void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *reply) +{ + aq->reply = reply; + + spin_lock_bh(&aq->lock); + ap_wait(ap_sm_event(aq, AP_EVENT_POLL)); + spin_unlock_bh(&aq->lock); +} +EXPORT_SYMBOL(ap_queue_init_reply); + +/** + * ap_queue_message(): Queue a request to an AP device. + * @aq: The AP device to queue the message to + * @ap_msg: The message that is to be added + */ +void ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg) +{ + /* For asynchronous message handling a valid receive-callback + * is required. + */ + BUG_ON(!ap_msg->receive); + + spin_lock_bh(&aq->lock); + /* Queue the message. */ + list_add_tail(&ap_msg->list, &aq->requestq); + aq->requestq_count++; + aq->total_request_count++; + atomic64_inc(&aq->card->total_request_count); + /* Send/receive as many request from the queue as possible. */ + ap_wait(ap_sm_event_loop(aq, AP_EVENT_POLL)); + spin_unlock_bh(&aq->lock); +} +EXPORT_SYMBOL(ap_queue_message); + +/** + * ap_cancel_message(): Cancel a crypto request. + * @aq: The AP device that has the message queued + * @ap_msg: The message that is to be removed + * + * Cancel a crypto request. This is done by removing the request + * from the device pending or request queue. Note that the + * request stays on the AP queue. When it finishes the message + * reply will be discarded because the psmid can't be found. + */ +void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg) +{ + struct ap_message *tmp; + + spin_lock_bh(&aq->lock); + if (!list_empty(&ap_msg->list)) { + list_for_each_entry(tmp, &aq->pendingq, list) + if (tmp->psmid == ap_msg->psmid) { + aq->pendingq_count--; + goto found; + } + aq->requestq_count--; +found: + list_del_init(&ap_msg->list); + } + spin_unlock_bh(&aq->lock); +} +EXPORT_SYMBOL(ap_cancel_message); + +/** + * __ap_flush_queue(): Flush requests. + * @aq: Pointer to the AP queue + * + * Flush all requests from the request/pending queue of an AP device. + */ +static void __ap_flush_queue(struct ap_queue *aq) +{ + struct ap_message *ap_msg, *next; + + list_for_each_entry_safe(ap_msg, next, &aq->pendingq, list) { + list_del_init(&ap_msg->list); + aq->pendingq_count--; + ap_msg->rc = -EAGAIN; + ap_msg->receive(aq, ap_msg, NULL); + } + list_for_each_entry_safe(ap_msg, next, &aq->requestq, list) { + list_del_init(&ap_msg->list); + aq->requestq_count--; + ap_msg->rc = -EAGAIN; + ap_msg->receive(aq, ap_msg, NULL); + } +} + +void ap_flush_queue(struct ap_queue *aq) +{ + spin_lock_bh(&aq->lock); + __ap_flush_queue(aq); + spin_unlock_bh(&aq->lock); +} +EXPORT_SYMBOL(ap_flush_queue); + +void ap_queue_remove(struct ap_queue *aq) +{ + ap_flush_queue(aq); + del_timer_sync(&aq->timeout); + + /* reset with zero, also clears irq registration */ + spin_lock_bh(&aq->lock); + ap_zapq(aq->qid); + aq->state = AP_STATE_BORKED; + spin_unlock_bh(&aq->lock); +} +EXPORT_SYMBOL(ap_queue_remove); + +void ap_queue_reinit_state(struct ap_queue *aq) +{ + spin_lock_bh(&aq->lock); + aq->state = AP_STATE_RESET_START; + ap_wait(ap_sm_event(aq, AP_EVENT_POLL)); + spin_unlock_bh(&aq->lock); +} +EXPORT_SYMBOL(ap_queue_reinit_state); diff --git a/drivers/s390/crypto/pkey_api.c b/drivers/s390/crypto/pkey_api.c new file mode 100644 index 000000000..b16344479 --- /dev/null +++ b/drivers/s390/crypto/pkey_api.c @@ -0,0 +1,1227 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * pkey device driver + * + * Copyright IBM Corp. 2017 + * Author(s): Harald Freudenberger + */ + +#define KMSG_COMPONENT "pkey" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "zcrypt_api.h" + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("s390 protected key interface"); + +/* Size of parameter block used for all cca requests/replies */ +#define PARMBSIZE 512 + +/* Size of vardata block used for some of the cca requests/replies */ +#define VARDATASIZE 4096 + +/* + * debug feature data and functions + */ + +static debug_info_t *debug_info; + +#define DEBUG_DBG(...) debug_sprintf_event(debug_info, 6, ##__VA_ARGS__) +#define DEBUG_INFO(...) debug_sprintf_event(debug_info, 5, ##__VA_ARGS__) +#define DEBUG_WARN(...) debug_sprintf_event(debug_info, 4, ##__VA_ARGS__) +#define DEBUG_ERR(...) debug_sprintf_event(debug_info, 3, ##__VA_ARGS__) + +static void __init pkey_debug_init(void) +{ + /* 5 arguments per dbf entry (including the format string ptr) */ + debug_info = debug_register("pkey", 1, 1, 5 * sizeof(long)); + debug_register_view(debug_info, &debug_sprintf_view); + debug_set_level(debug_info, 3); +} + +static void __exit pkey_debug_exit(void) +{ + debug_unregister(debug_info); +} + +/* inside view of a secure key token (only type 0x01 version 0x04) */ +struct secaeskeytoken { + u8 type; /* 0x01 for internal key token */ + u8 res0[3]; + u8 version; /* should be 0x04 */ + u8 res1[1]; + u8 flag; /* key flags */ + u8 res2[1]; + u64 mkvp; /* master key verification pattern */ + u8 key[32]; /* key value (encrypted) */ + u8 cv[8]; /* control vector */ + u16 bitsize; /* key bit size */ + u16 keysize; /* key byte size */ + u8 tvv[4]; /* token validation value */ +} __packed; + +/* + * Simple check if the token is a valid CCA secure AES key + * token. If keybitsize is given, the bitsize of the key is + * also checked. Returns 0 on success or errno value on failure. + */ +static int check_secaeskeytoken(const u8 *token, int keybitsize) +{ + struct secaeskeytoken *t = (struct secaeskeytoken *) token; + + if (t->type != 0x01) { + DEBUG_ERR( + "%s secure token check failed, type mismatch 0x%02x != 0x01\n", + __func__, (int) t->type); + return -EINVAL; + } + if (t->version != 0x04) { + DEBUG_ERR( + "%s secure token check failed, version mismatch 0x%02x != 0x04\n", + __func__, (int) t->version); + return -EINVAL; + } + if (keybitsize > 0 && t->bitsize != keybitsize) { + DEBUG_ERR( + "%s secure token check failed, bitsize mismatch %d != %d\n", + __func__, (int) t->bitsize, keybitsize); + return -EINVAL; + } + + return 0; +} + +/* + * Allocate consecutive memory for request CPRB, request param + * block, reply CPRB and reply param block and fill in values + * for the common fields. Returns 0 on success or errno value + * on failure. + */ +static int alloc_and_prep_cprbmem(size_t paramblen, + u8 **pcprbmem, + struct CPRBX **preqCPRB, + struct CPRBX **prepCPRB) +{ + u8 *cprbmem; + size_t cprbplusparamblen = sizeof(struct CPRBX) + paramblen; + struct CPRBX *preqcblk, *prepcblk; + + /* + * allocate consecutive memory for request CPRB, request param + * block, reply CPRB and reply param block + */ + cprbmem = kcalloc(2, cprbplusparamblen, GFP_KERNEL); + if (!cprbmem) + return -ENOMEM; + + preqcblk = (struct CPRBX *) cprbmem; + prepcblk = (struct CPRBX *) (cprbmem + cprbplusparamblen); + + /* fill request cprb struct */ + preqcblk->cprb_len = sizeof(struct CPRBX); + preqcblk->cprb_ver_id = 0x02; + memcpy(preqcblk->func_id, "T2", 2); + preqcblk->rpl_msgbl = cprbplusparamblen; + if (paramblen) { + preqcblk->req_parmb = + ((u8 *) preqcblk) + sizeof(struct CPRBX); + preqcblk->rpl_parmb = + ((u8 *) prepcblk) + sizeof(struct CPRBX); + } + + *pcprbmem = cprbmem; + *preqCPRB = preqcblk; + *prepCPRB = prepcblk; + + return 0; +} + +/* + * Free the cprb memory allocated with the function above. + * If the scrub value is not zero, the memory is filled + * with zeros before freeing (useful if there was some + * clear key material in there). + */ +static void free_cprbmem(void *mem, size_t paramblen, int scrub) +{ + if (scrub) + memzero_explicit(mem, 2 * (sizeof(struct CPRBX) + paramblen)); + kfree(mem); +} + +/* + * Helper function to prepare the xcrb struct + */ +static inline void prep_xcrb(struct ica_xcRB *pxcrb, + u16 cardnr, + struct CPRBX *preqcblk, + struct CPRBX *prepcblk) +{ + memset(pxcrb, 0, sizeof(*pxcrb)); + pxcrb->agent_ID = 0x4341; /* 'CA' */ + pxcrb->user_defined = (cardnr == 0xFFFF ? AUTOSELECT : cardnr); + pxcrb->request_control_blk_length = + preqcblk->cprb_len + preqcblk->req_parml; + pxcrb->request_control_blk_addr = (void __user *) preqcblk; + pxcrb->reply_control_blk_length = preqcblk->rpl_msgbl; + pxcrb->reply_control_blk_addr = (void __user *) prepcblk; +} + +/* + * Helper function which calls zcrypt_send_cprb with + * memory management segment adjusted to kernel space + * so that the copy_from_user called within this + * function do in fact copy from kernel space. + */ +static inline int _zcrypt_send_cprb(struct ica_xcRB *xcrb) +{ + int rc; + mm_segment_t old_fs = get_fs(); + + set_fs(KERNEL_DS); + rc = zcrypt_send_cprb(xcrb); + set_fs(old_fs); + + return rc; +} + +/* + * Generate (random) AES secure key. + */ +int pkey_genseckey(u16 cardnr, u16 domain, + u32 keytype, struct pkey_seckey *seckey) +{ + int i, rc, keysize; + int seckeysize; + u8 *mem; + struct CPRBX *preqcblk, *prepcblk; + struct ica_xcRB xcrb; + struct kgreqparm { + u8 subfunc_code[2]; + u16 rule_array_len; + struct lv1 { + u16 len; + char key_form[8]; + char key_length[8]; + char key_type1[8]; + char key_type2[8]; + } lv1; + struct lv2 { + u16 len; + struct keyid { + u16 len; + u16 attr; + u8 data[SECKEYBLOBSIZE]; + } keyid[6]; + } lv2; + } *preqparm; + struct kgrepparm { + u8 subfunc_code[2]; + u16 rule_array_len; + struct lv3 { + u16 len; + u16 keyblocklen; + struct { + u16 toklen; + u16 tokattr; + u8 tok[0]; + /* ... some more data ... */ + } keyblock; + } lv3; + } *prepparm; + + /* get already prepared memory for 2 cprbs with param block each */ + rc = alloc_and_prep_cprbmem(PARMBSIZE, &mem, &preqcblk, &prepcblk); + if (rc) + return rc; + + /* fill request cprb struct */ + preqcblk->domain = domain; + + /* fill request cprb param block with KG request */ + preqparm = (struct kgreqparm *) preqcblk->req_parmb; + memcpy(preqparm->subfunc_code, "KG", 2); + preqparm->rule_array_len = sizeof(preqparm->rule_array_len); + preqparm->lv1.len = sizeof(struct lv1); + memcpy(preqparm->lv1.key_form, "OP ", 8); + switch (keytype) { + case PKEY_KEYTYPE_AES_128: + keysize = 16; + memcpy(preqparm->lv1.key_length, "KEYLN16 ", 8); + break; + case PKEY_KEYTYPE_AES_192: + keysize = 24; + memcpy(preqparm->lv1.key_length, "KEYLN24 ", 8); + break; + case PKEY_KEYTYPE_AES_256: + keysize = 32; + memcpy(preqparm->lv1.key_length, "KEYLN32 ", 8); + break; + default: + DEBUG_ERR( + "%s unknown/unsupported keytype %d\n", + __func__, keytype); + rc = -EINVAL; + goto out; + } + memcpy(preqparm->lv1.key_type1, "AESDATA ", 8); + preqparm->lv2.len = sizeof(struct lv2); + for (i = 0; i < 6; i++) { + preqparm->lv2.keyid[i].len = sizeof(struct keyid); + preqparm->lv2.keyid[i].attr = (i == 2 ? 0x30 : 0x10); + } + preqcblk->req_parml = sizeof(struct kgreqparm); + + /* fill xcrb struct */ + prep_xcrb(&xcrb, cardnr, preqcblk, prepcblk); + + /* forward xcrb with request CPRB and reply CPRB to zcrypt dd */ + rc = _zcrypt_send_cprb(&xcrb); + if (rc) { + DEBUG_ERR( + "%s zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n", + __func__, (int) cardnr, (int) domain, rc); + goto out; + } + + /* check response returncode and reasoncode */ + if (prepcblk->ccp_rtcode != 0) { + DEBUG_ERR( + "%s secure key generate failure, card response %d/%d\n", + __func__, + (int) prepcblk->ccp_rtcode, + (int) prepcblk->ccp_rscode); + rc = -EIO; + goto out; + } + + /* process response cprb param block */ + prepcblk->rpl_parmb = ((u8 *) prepcblk) + sizeof(struct CPRBX); + prepparm = (struct kgrepparm *) prepcblk->rpl_parmb; + + /* check length of the returned secure key token */ + seckeysize = prepparm->lv3.keyblock.toklen + - sizeof(prepparm->lv3.keyblock.toklen) + - sizeof(prepparm->lv3.keyblock.tokattr); + if (seckeysize != SECKEYBLOBSIZE) { + DEBUG_ERR( + "%s secure token size mismatch %d != %d bytes\n", + __func__, seckeysize, SECKEYBLOBSIZE); + rc = -EIO; + goto out; + } + + /* check secure key token */ + rc = check_secaeskeytoken(prepparm->lv3.keyblock.tok, 8*keysize); + if (rc) { + rc = -EIO; + goto out; + } + + /* copy the generated secure key token */ + memcpy(seckey->seckey, prepparm->lv3.keyblock.tok, SECKEYBLOBSIZE); + +out: + free_cprbmem(mem, PARMBSIZE, 0); + return rc; +} +EXPORT_SYMBOL(pkey_genseckey); + +/* + * Generate an AES secure key with given key value. + */ +int pkey_clr2seckey(u16 cardnr, u16 domain, u32 keytype, + const struct pkey_clrkey *clrkey, + struct pkey_seckey *seckey) +{ + int rc, keysize, seckeysize; + u8 *mem; + struct CPRBX *preqcblk, *prepcblk; + struct ica_xcRB xcrb; + struct cmreqparm { + u8 subfunc_code[2]; + u16 rule_array_len; + char rule_array[8]; + struct lv1 { + u16 len; + u8 clrkey[0]; + } lv1; + struct lv2 { + u16 len; + struct keyid { + u16 len; + u16 attr; + u8 data[SECKEYBLOBSIZE]; + } keyid; + } lv2; + } *preqparm; + struct lv2 *plv2; + struct cmrepparm { + u8 subfunc_code[2]; + u16 rule_array_len; + struct lv3 { + u16 len; + u16 keyblocklen; + struct { + u16 toklen; + u16 tokattr; + u8 tok[0]; + /* ... some more data ... */ + } keyblock; + } lv3; + } *prepparm; + + /* get already prepared memory for 2 cprbs with param block each */ + rc = alloc_and_prep_cprbmem(PARMBSIZE, &mem, &preqcblk, &prepcblk); + if (rc) + return rc; + + /* fill request cprb struct */ + preqcblk->domain = domain; + + /* fill request cprb param block with CM request */ + preqparm = (struct cmreqparm *) preqcblk->req_parmb; + memcpy(preqparm->subfunc_code, "CM", 2); + memcpy(preqparm->rule_array, "AES ", 8); + preqparm->rule_array_len = + sizeof(preqparm->rule_array_len) + sizeof(preqparm->rule_array); + switch (keytype) { + case PKEY_KEYTYPE_AES_128: + keysize = 16; + break; + case PKEY_KEYTYPE_AES_192: + keysize = 24; + break; + case PKEY_KEYTYPE_AES_256: + keysize = 32; + break; + default: + DEBUG_ERR( + "%s unknown/unsupported keytype %d\n", + __func__, keytype); + rc = -EINVAL; + goto out; + } + preqparm->lv1.len = sizeof(struct lv1) + keysize; + memcpy(preqparm->lv1.clrkey, clrkey->clrkey, keysize); + plv2 = (struct lv2 *) (((u8 *) &preqparm->lv2) + keysize); + plv2->len = sizeof(struct lv2); + plv2->keyid.len = sizeof(struct keyid); + plv2->keyid.attr = 0x30; + preqcblk->req_parml = sizeof(struct cmreqparm) + keysize; + + /* fill xcrb struct */ + prep_xcrb(&xcrb, cardnr, preqcblk, prepcblk); + + /* forward xcrb with request CPRB and reply CPRB to zcrypt dd */ + rc = _zcrypt_send_cprb(&xcrb); + if (rc) { + DEBUG_ERR( + "%s zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n", + __func__, (int) cardnr, (int) domain, rc); + goto out; + } + + /* check response returncode and reasoncode */ + if (prepcblk->ccp_rtcode != 0) { + DEBUG_ERR( + "%s clear key import failure, card response %d/%d\n", + __func__, + (int) prepcblk->ccp_rtcode, + (int) prepcblk->ccp_rscode); + rc = -EIO; + goto out; + } + + /* process response cprb param block */ + prepcblk->rpl_parmb = ((u8 *) prepcblk) + sizeof(struct CPRBX); + prepparm = (struct cmrepparm *) prepcblk->rpl_parmb; + + /* check length of the returned secure key token */ + seckeysize = prepparm->lv3.keyblock.toklen + - sizeof(prepparm->lv3.keyblock.toklen) + - sizeof(prepparm->lv3.keyblock.tokattr); + if (seckeysize != SECKEYBLOBSIZE) { + DEBUG_ERR( + "%s secure token size mismatch %d != %d bytes\n", + __func__, seckeysize, SECKEYBLOBSIZE); + rc = -EIO; + goto out; + } + + /* check secure key token */ + rc = check_secaeskeytoken(prepparm->lv3.keyblock.tok, 8*keysize); + if (rc) { + rc = -EIO; + goto out; + } + + /* copy the generated secure key token */ + memcpy(seckey->seckey, prepparm->lv3.keyblock.tok, SECKEYBLOBSIZE); + +out: + free_cprbmem(mem, PARMBSIZE, 1); + return rc; +} +EXPORT_SYMBOL(pkey_clr2seckey); + +/* + * Derive a proteced key from the secure key blob. + */ +int pkey_sec2protkey(u16 cardnr, u16 domain, + const struct pkey_seckey *seckey, + struct pkey_protkey *protkey) +{ + int rc; + u8 *mem; + struct CPRBX *preqcblk, *prepcblk; + struct ica_xcRB xcrb; + struct uskreqparm { + u8 subfunc_code[2]; + u16 rule_array_len; + struct lv1 { + u16 len; + u16 attr_len; + u16 attr_flags; + } lv1; + struct lv2 { + u16 len; + u16 attr_len; + u16 attr_flags; + u8 token[0]; /* cca secure key token */ + } lv2 __packed; + } *preqparm; + struct uskrepparm { + u8 subfunc_code[2]; + u16 rule_array_len; + struct lv3 { + u16 len; + u16 attr_len; + u16 attr_flags; + struct cpacfkeyblock { + u8 version; /* version of this struct */ + u8 flags[2]; + u8 algo; + u8 form; + u8 pad1[3]; + u16 keylen; + u8 key[64]; /* the key (keylen bytes) */ + u16 keyattrlen; + u8 keyattr[32]; + u8 pad2[1]; + u8 vptype; + u8 vp[32]; /* verification pattern */ + } keyblock; + } lv3 __packed; + } *prepparm; + + /* get already prepared memory for 2 cprbs with param block each */ + rc = alloc_and_prep_cprbmem(PARMBSIZE, &mem, &preqcblk, &prepcblk); + if (rc) + return rc; + + /* fill request cprb struct */ + preqcblk->domain = domain; + + /* fill request cprb param block with USK request */ + preqparm = (struct uskreqparm *) preqcblk->req_parmb; + memcpy(preqparm->subfunc_code, "US", 2); + preqparm->rule_array_len = sizeof(preqparm->rule_array_len); + preqparm->lv1.len = sizeof(struct lv1); + preqparm->lv1.attr_len = sizeof(struct lv1) - sizeof(preqparm->lv1.len); + preqparm->lv1.attr_flags = 0x0001; + preqparm->lv2.len = sizeof(struct lv2) + SECKEYBLOBSIZE; + preqparm->lv2.attr_len = sizeof(struct lv2) + - sizeof(preqparm->lv2.len) + SECKEYBLOBSIZE; + preqparm->lv2.attr_flags = 0x0000; + memcpy(preqparm->lv2.token, seckey->seckey, SECKEYBLOBSIZE); + preqcblk->req_parml = sizeof(struct uskreqparm) + SECKEYBLOBSIZE; + + /* fill xcrb struct */ + prep_xcrb(&xcrb, cardnr, preqcblk, prepcblk); + + /* forward xcrb with request CPRB and reply CPRB to zcrypt dd */ + rc = _zcrypt_send_cprb(&xcrb); + if (rc) { + DEBUG_ERR( + "%s zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n", + __func__, (int) cardnr, (int) domain, rc); + goto out; + } + + /* check response returncode and reasoncode */ + if (prepcblk->ccp_rtcode != 0) { + DEBUG_ERR( + "%s unwrap secure key failure, card response %d/%d\n", + __func__, + (int) prepcblk->ccp_rtcode, + (int) prepcblk->ccp_rscode); + rc = -EIO; + goto out; + } + if (prepcblk->ccp_rscode != 0) { + DEBUG_WARN( + "%s unwrap secure key warning, card response %d/%d\n", + __func__, + (int) prepcblk->ccp_rtcode, + (int) prepcblk->ccp_rscode); + } + + /* process response cprb param block */ + prepcblk->rpl_parmb = ((u8 *) prepcblk) + sizeof(struct CPRBX); + prepparm = (struct uskrepparm *) prepcblk->rpl_parmb; + + /* check the returned keyblock */ + if (prepparm->lv3.keyblock.version != 0x01) { + DEBUG_ERR( + "%s reply param keyblock version mismatch 0x%02x != 0x01\n", + __func__, (int) prepparm->lv3.keyblock.version); + rc = -EIO; + goto out; + } + + /* copy the tanslated protected key */ + switch (prepparm->lv3.keyblock.keylen) { + case 16+32: + protkey->type = PKEY_KEYTYPE_AES_128; + break; + case 24+32: + protkey->type = PKEY_KEYTYPE_AES_192; + break; + case 32+32: + protkey->type = PKEY_KEYTYPE_AES_256; + break; + default: + DEBUG_ERR("%s unknown/unsupported keytype %d\n", + __func__, prepparm->lv3.keyblock.keylen); + rc = -EIO; + goto out; + } + protkey->len = prepparm->lv3.keyblock.keylen; + memcpy(protkey->protkey, prepparm->lv3.keyblock.key, protkey->len); + +out: + free_cprbmem(mem, PARMBSIZE, 0); + return rc; +} +EXPORT_SYMBOL(pkey_sec2protkey); + +/* + * Create a protected key from a clear key value. + */ +int pkey_clr2protkey(u32 keytype, + const struct pkey_clrkey *clrkey, + struct pkey_protkey *protkey) +{ + long fc; + int keysize; + u8 paramblock[64]; + + switch (keytype) { + case PKEY_KEYTYPE_AES_128: + keysize = 16; + fc = CPACF_PCKMO_ENC_AES_128_KEY; + break; + case PKEY_KEYTYPE_AES_192: + keysize = 24; + fc = CPACF_PCKMO_ENC_AES_192_KEY; + break; + case PKEY_KEYTYPE_AES_256: + keysize = 32; + fc = CPACF_PCKMO_ENC_AES_256_KEY; + break; + default: + DEBUG_ERR("%s unknown/unsupported keytype %d\n", + __func__, keytype); + return -EINVAL; + } + + /* prepare param block */ + memset(paramblock, 0, sizeof(paramblock)); + memcpy(paramblock, clrkey->clrkey, keysize); + + /* call the pckmo instruction */ + cpacf_pckmo(fc, paramblock); + + /* copy created protected key */ + protkey->type = keytype; + protkey->len = keysize + 32; + memcpy(protkey->protkey, paramblock, keysize + 32); + + return 0; +} +EXPORT_SYMBOL(pkey_clr2protkey); + +/* + * query cryptographic facility from adapter + */ +static int query_crypto_facility(u16 cardnr, u16 domain, + const char *keyword, + u8 *rarray, size_t *rarraylen, + u8 *varray, size_t *varraylen) +{ + int rc; + u16 len; + u8 *mem, *ptr; + struct CPRBX *preqcblk, *prepcblk; + struct ica_xcRB xcrb; + struct fqreqparm { + u8 subfunc_code[2]; + u16 rule_array_len; + char rule_array[8]; + struct lv1 { + u16 len; + u8 data[VARDATASIZE]; + } lv1; + u16 dummylen; + } *preqparm; + size_t parmbsize = sizeof(struct fqreqparm); + struct fqrepparm { + u8 subfunc_code[2]; + u8 lvdata[0]; + } *prepparm; + + /* get already prepared memory for 2 cprbs with param block each */ + rc = alloc_and_prep_cprbmem(parmbsize, &mem, &preqcblk, &prepcblk); + if (rc) + return rc; + + /* fill request cprb struct */ + preqcblk->domain = domain; + + /* fill request cprb param block with FQ request */ + preqparm = (struct fqreqparm *) preqcblk->req_parmb; + memcpy(preqparm->subfunc_code, "FQ", 2); + memcpy(preqparm->rule_array, keyword, sizeof(preqparm->rule_array)); + preqparm->rule_array_len = + sizeof(preqparm->rule_array_len) + sizeof(preqparm->rule_array); + preqparm->lv1.len = sizeof(preqparm->lv1); + preqparm->dummylen = sizeof(preqparm->dummylen); + preqcblk->req_parml = parmbsize; + + /* fill xcrb struct */ + prep_xcrb(&xcrb, cardnr, preqcblk, prepcblk); + + /* forward xcrb with request CPRB and reply CPRB to zcrypt dd */ + rc = _zcrypt_send_cprb(&xcrb); + if (rc) { + DEBUG_ERR( + "%s zcrypt_send_cprb (cardnr=%d domain=%d) failed with errno %d\n", + __func__, (int) cardnr, (int) domain, rc); + goto out; + } + + /* check response returncode and reasoncode */ + if (prepcblk->ccp_rtcode != 0) { + DEBUG_ERR( + "%s unwrap secure key failure, card response %d/%d\n", + __func__, + (int) prepcblk->ccp_rtcode, + (int) prepcblk->ccp_rscode); + rc = -EIO; + goto out; + } + + /* process response cprb param block */ + prepcblk->rpl_parmb = ((u8 *) prepcblk) + sizeof(struct CPRBX); + prepparm = (struct fqrepparm *) prepcblk->rpl_parmb; + ptr = prepparm->lvdata; + + /* check and possibly copy reply rule array */ + len = *((u16 *) ptr); + if (len > sizeof(u16)) { + ptr += sizeof(u16); + len -= sizeof(u16); + if (rarray && rarraylen && *rarraylen > 0) { + *rarraylen = (len > *rarraylen ? *rarraylen : len); + memcpy(rarray, ptr, *rarraylen); + } + ptr += len; + } + /* check and possible copy reply var array */ + len = *((u16 *) ptr); + if (len > sizeof(u16)) { + ptr += sizeof(u16); + len -= sizeof(u16); + if (varray && varraylen && *varraylen > 0) { + *varraylen = (len > *varraylen ? *varraylen : len); + memcpy(varray, ptr, *varraylen); + } + ptr += len; + } + +out: + free_cprbmem(mem, parmbsize, 0); + return rc; +} + +/* + * Fetch the current and old mkvp values via + * query_crypto_facility from adapter. + */ +static int fetch_mkvp(u16 cardnr, u16 domain, u64 mkvp[2]) +{ + int rc, found = 0; + size_t rlen, vlen; + u8 *rarray, *varray, *pg; + + pg = (u8 *) __get_free_page(GFP_KERNEL); + if (!pg) + return -ENOMEM; + rarray = pg; + varray = pg + PAGE_SIZE/2; + rlen = vlen = PAGE_SIZE/2; + + rc = query_crypto_facility(cardnr, domain, "STATICSA", + rarray, &rlen, varray, &vlen); + if (rc == 0 && rlen > 8*8 && vlen > 184+8) { + if (rarray[8*8] == '2') { + /* current master key state is valid */ + mkvp[0] = *((u64 *)(varray + 184)); + mkvp[1] = *((u64 *)(varray + 172)); + found = 1; + } + } + + free_page((unsigned long) pg); + + return found ? 0 : -ENOENT; +} + +/* struct to hold cached mkvp info for each card/domain */ +struct mkvp_info { + struct list_head list; + u16 cardnr; + u16 domain; + u64 mkvp[2]; +}; + +/* a list with mkvp_info entries */ +static LIST_HEAD(mkvp_list); +static DEFINE_SPINLOCK(mkvp_list_lock); + +static int mkvp_cache_fetch(u16 cardnr, u16 domain, u64 mkvp[2]) +{ + int rc = -ENOENT; + struct mkvp_info *ptr; + + spin_lock_bh(&mkvp_list_lock); + list_for_each_entry(ptr, &mkvp_list, list) { + if (ptr->cardnr == cardnr && + ptr->domain == domain) { + memcpy(mkvp, ptr->mkvp, 2 * sizeof(u64)); + rc = 0; + break; + } + } + spin_unlock_bh(&mkvp_list_lock); + + return rc; +} + +static void mkvp_cache_update(u16 cardnr, u16 domain, u64 mkvp[2]) +{ + int found = 0; + struct mkvp_info *ptr; + + spin_lock_bh(&mkvp_list_lock); + list_for_each_entry(ptr, &mkvp_list, list) { + if (ptr->cardnr == cardnr && + ptr->domain == domain) { + memcpy(ptr->mkvp, mkvp, 2 * sizeof(u64)); + found = 1; + break; + } + } + if (!found) { + ptr = kmalloc(sizeof(*ptr), GFP_ATOMIC); + if (!ptr) { + spin_unlock_bh(&mkvp_list_lock); + return; + } + ptr->cardnr = cardnr; + ptr->domain = domain; + memcpy(ptr->mkvp, mkvp, 2 * sizeof(u64)); + list_add(&ptr->list, &mkvp_list); + } + spin_unlock_bh(&mkvp_list_lock); +} + +static void mkvp_cache_scrub(u16 cardnr, u16 domain) +{ + struct mkvp_info *ptr; + + spin_lock_bh(&mkvp_list_lock); + list_for_each_entry(ptr, &mkvp_list, list) { + if (ptr->cardnr == cardnr && + ptr->domain == domain) { + list_del(&ptr->list); + kfree(ptr); + break; + } + } + spin_unlock_bh(&mkvp_list_lock); +} + +static void __exit mkvp_cache_free(void) +{ + struct mkvp_info *ptr, *pnext; + + spin_lock_bh(&mkvp_list_lock); + list_for_each_entry_safe(ptr, pnext, &mkvp_list, list) { + list_del(&ptr->list); + kfree(ptr); + } + spin_unlock_bh(&mkvp_list_lock); +} + +/* + * Search for a matching crypto card based on the Master Key + * Verification Pattern provided inside a secure key. + */ +int pkey_findcard(const struct pkey_seckey *seckey, + u16 *pcardnr, u16 *pdomain, int verify) +{ + struct secaeskeytoken *t = (struct secaeskeytoken *) seckey; + struct zcrypt_device_status_ext *device_status; + u16 card, dom; + u64 mkvp[2]; + int i, rc, oi = -1; + + /* mkvp must not be zero */ + if (t->mkvp == 0) + return -EINVAL; + + /* fetch status of all crypto cards */ + device_status = kmalloc_array(MAX_ZDEV_ENTRIES_EXT, + sizeof(struct zcrypt_device_status_ext), + GFP_KERNEL); + if (!device_status) + return -ENOMEM; + zcrypt_device_status_mask_ext(device_status); + + /* walk through all crypto cards */ + for (i = 0; i < MAX_ZDEV_ENTRIES_EXT; i++) { + card = AP_QID_CARD(device_status[i].qid); + dom = AP_QID_QUEUE(device_status[i].qid); + if (device_status[i].online && + device_status[i].functions & 0x04) { + /* an enabled CCA Coprocessor card */ + /* try cached mkvp */ + if (mkvp_cache_fetch(card, dom, mkvp) == 0 && + t->mkvp == mkvp[0]) { + if (!verify) + break; + /* verify: fetch mkvp from adapter */ + if (fetch_mkvp(card, dom, mkvp) == 0) { + mkvp_cache_update(card, dom, mkvp); + if (t->mkvp == mkvp[0]) + break; + } + } + } else { + /* Card is offline and/or not a CCA card. */ + /* del mkvp entry from cache if it exists */ + mkvp_cache_scrub(card, dom); + } + } + if (i >= MAX_ZDEV_ENTRIES_EXT) { + /* nothing found, so this time without cache */ + for (i = 0; i < MAX_ZDEV_ENTRIES_EXT; i++) { + if (!(device_status[i].online && + device_status[i].functions & 0x04)) + continue; + card = AP_QID_CARD(device_status[i].qid); + dom = AP_QID_QUEUE(device_status[i].qid); + /* fresh fetch mkvp from adapter */ + if (fetch_mkvp(card, dom, mkvp) == 0) { + mkvp_cache_update(card, dom, mkvp); + if (t->mkvp == mkvp[0]) + break; + if (t->mkvp == mkvp[1] && oi < 0) + oi = i; + } + } + if (i >= MAX_ZDEV_ENTRIES_EXT && oi >= 0) { + /* old mkvp matched, use this card then */ + card = AP_QID_CARD(device_status[oi].qid); + dom = AP_QID_QUEUE(device_status[oi].qid); + } + } + if (i < MAX_ZDEV_ENTRIES_EXT || oi >= 0) { + if (pcardnr) + *pcardnr = card; + if (pdomain) + *pdomain = dom; + rc = 0; + } else + rc = -ENODEV; + + kfree(device_status); + return rc; +} +EXPORT_SYMBOL(pkey_findcard); + +/* + * Find card and transform secure key into protected key. + */ +int pkey_skey2pkey(const struct pkey_seckey *seckey, + struct pkey_protkey *protkey) +{ + u16 cardnr, domain; + int rc, verify; + + /* + * The pkey_sec2protkey call may fail when a card has been + * addressed where the master key was changed after last fetch + * of the mkvp into the cache. So first try without verify then + * with verify enabled (thus refreshing the mkvp for each card). + */ + for (verify = 0; verify < 2; verify++) { + rc = pkey_findcard(seckey, &cardnr, &domain, verify); + if (rc) + continue; + rc = pkey_sec2protkey(cardnr, domain, seckey, protkey); + if (rc == 0) + break; + } + + if (rc) + DEBUG_DBG("%s failed rc=%d\n", __func__, rc); + + return rc; +} +EXPORT_SYMBOL(pkey_skey2pkey); + +/* + * Verify key and give back some info about the key. + */ +int pkey_verifykey(const struct pkey_seckey *seckey, + u16 *pcardnr, u16 *pdomain, + u16 *pkeysize, u32 *pattributes) +{ + struct secaeskeytoken *t = (struct secaeskeytoken *) seckey; + u16 cardnr, domain; + u64 mkvp[2]; + int rc; + + /* check the secure key for valid AES secure key */ + rc = check_secaeskeytoken((u8 *) seckey, 0); + if (rc) + goto out; + if (pattributes) + *pattributes = PKEY_VERIFY_ATTR_AES; + if (pkeysize) + *pkeysize = t->bitsize; + + /* try to find a card which can handle this key */ + rc = pkey_findcard(seckey, &cardnr, &domain, 1); + if (rc) + goto out; + + /* check mkvp for old mkvp match */ + rc = mkvp_cache_fetch(cardnr, domain, mkvp); + if (rc) + goto out; + if (t->mkvp == mkvp[1]) { + DEBUG_DBG("%s secure key has old mkvp\n", __func__); + if (pattributes) + *pattributes |= PKEY_VERIFY_ATTR_OLD_MKVP; + } + + if (pcardnr) + *pcardnr = cardnr; + if (pdomain) + *pdomain = domain; + +out: + DEBUG_DBG("%s rc=%d\n", __func__, rc); + return rc; +} +EXPORT_SYMBOL(pkey_verifykey); + +/* + * File io functions + */ + +static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + int rc; + + switch (cmd) { + case PKEY_GENSECK: { + struct pkey_genseck __user *ugs = (void __user *) arg; + struct pkey_genseck kgs; + + if (copy_from_user(&kgs, ugs, sizeof(kgs))) + return -EFAULT; + rc = pkey_genseckey(kgs.cardnr, kgs.domain, + kgs.keytype, &kgs.seckey); + DEBUG_DBG("%s pkey_genseckey()=%d\n", __func__, rc); + if (rc) + break; + if (copy_to_user(ugs, &kgs, sizeof(kgs))) + return -EFAULT; + break; + } + case PKEY_CLR2SECK: { + struct pkey_clr2seck __user *ucs = (void __user *) arg; + struct pkey_clr2seck kcs; + + if (copy_from_user(&kcs, ucs, sizeof(kcs))) + return -EFAULT; + rc = pkey_clr2seckey(kcs.cardnr, kcs.domain, kcs.keytype, + &kcs.clrkey, &kcs.seckey); + DEBUG_DBG("%s pkey_clr2seckey()=%d\n", __func__, rc); + if (rc) + break; + if (copy_to_user(ucs, &kcs, sizeof(kcs))) + return -EFAULT; + memzero_explicit(&kcs, sizeof(kcs)); + break; + } + case PKEY_SEC2PROTK: { + struct pkey_sec2protk __user *usp = (void __user *) arg; + struct pkey_sec2protk ksp; + + if (copy_from_user(&ksp, usp, sizeof(ksp))) + return -EFAULT; + rc = pkey_sec2protkey(ksp.cardnr, ksp.domain, + &ksp.seckey, &ksp.protkey); + DEBUG_DBG("%s pkey_sec2protkey()=%d\n", __func__, rc); + if (rc) + break; + if (copy_to_user(usp, &ksp, sizeof(ksp))) + return -EFAULT; + break; + } + case PKEY_CLR2PROTK: { + struct pkey_clr2protk __user *ucp = (void __user *) arg; + struct pkey_clr2protk kcp; + + if (copy_from_user(&kcp, ucp, sizeof(kcp))) + return -EFAULT; + rc = pkey_clr2protkey(kcp.keytype, + &kcp.clrkey, &kcp.protkey); + DEBUG_DBG("%s pkey_clr2protkey()=%d\n", __func__, rc); + if (rc) + break; + if (copy_to_user(ucp, &kcp, sizeof(kcp))) + return -EFAULT; + memzero_explicit(&kcp, sizeof(kcp)); + break; + } + case PKEY_FINDCARD: { + struct pkey_findcard __user *ufc = (void __user *) arg; + struct pkey_findcard kfc; + + if (copy_from_user(&kfc, ufc, sizeof(kfc))) + return -EFAULT; + rc = pkey_findcard(&kfc.seckey, + &kfc.cardnr, &kfc.domain, 1); + DEBUG_DBG("%s pkey_findcard()=%d\n", __func__, rc); + if (rc) + break; + if (copy_to_user(ufc, &kfc, sizeof(kfc))) + return -EFAULT; + break; + } + case PKEY_SKEY2PKEY: { + struct pkey_skey2pkey __user *usp = (void __user *) arg; + struct pkey_skey2pkey ksp; + + if (copy_from_user(&ksp, usp, sizeof(ksp))) + return -EFAULT; + rc = pkey_skey2pkey(&ksp.seckey, &ksp.protkey); + DEBUG_DBG("%s pkey_skey2pkey()=%d\n", __func__, rc); + if (rc) + break; + if (copy_to_user(usp, &ksp, sizeof(ksp))) + return -EFAULT; + break; + } + case PKEY_VERIFYKEY: { + struct pkey_verifykey __user *uvk = (void __user *) arg; + struct pkey_verifykey kvk; + + if (copy_from_user(&kvk, uvk, sizeof(kvk))) + return -EFAULT; + rc = pkey_verifykey(&kvk.seckey, &kvk.cardnr, &kvk.domain, + &kvk.keysize, &kvk.attributes); + DEBUG_DBG("%s pkey_verifykey()=%d\n", __func__, rc); + if (rc) + break; + if (copy_to_user(uvk, &kvk, sizeof(kvk))) + return -EFAULT; + break; + } + default: + /* unknown/unsupported ioctl cmd */ + return -ENOTTY; + } + + return rc; +} + +/* + * Sysfs and file io operations + */ +static const struct file_operations pkey_fops = { + .owner = THIS_MODULE, + .open = nonseekable_open, + .llseek = no_llseek, + .unlocked_ioctl = pkey_unlocked_ioctl, +}; + +static struct miscdevice pkey_dev = { + .name = "pkey", + .minor = MISC_DYNAMIC_MINOR, + .mode = 0666, + .fops = &pkey_fops, +}; + +/* + * Module init + */ +static int __init pkey_init(void) +{ + cpacf_mask_t pckmo_functions; + + /* check for pckmo instructions available */ + if (!cpacf_query(CPACF_PCKMO, &pckmo_functions)) + return -EOPNOTSUPP; + if (!cpacf_test_func(&pckmo_functions, CPACF_PCKMO_ENC_AES_128_KEY) || + !cpacf_test_func(&pckmo_functions, CPACF_PCKMO_ENC_AES_192_KEY) || + !cpacf_test_func(&pckmo_functions, CPACF_PCKMO_ENC_AES_256_KEY)) + return -EOPNOTSUPP; + + pkey_debug_init(); + + return misc_register(&pkey_dev); +} + +/* + * Module exit + */ +static void __exit pkey_exit(void) +{ + misc_deregister(&pkey_dev); + mkvp_cache_free(); + pkey_debug_exit(); +} + +module_init(pkey_init); +module_exit(pkey_exit); diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c new file mode 100644 index 000000000..b7cb897cd --- /dev/null +++ b/drivers/s390/crypto/zcrypt_api.c @@ -0,0 +1,1306 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * Cornelia Huck + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * Ralph Wuerthner + * MSGTYPE restruct: Holger Dengler + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CREATE_TRACE_POINTS +#include + +#include "zcrypt_api.h" +#include "zcrypt_debug.h" + +#include "zcrypt_msgtype6.h" +#include "zcrypt_msgtype50.h" + +/* + * Module description. + */ +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("Cryptographic Coprocessor interface, " \ + "Copyright IBM Corp. 2001, 2012"); +MODULE_LICENSE("GPL"); + +/* + * zcrypt tracepoint functions + */ +EXPORT_TRACEPOINT_SYMBOL(s390_zcrypt_req); +EXPORT_TRACEPOINT_SYMBOL(s390_zcrypt_rep); + +static int zcrypt_hwrng_seed = 1; +module_param_named(hwrng_seed, zcrypt_hwrng_seed, int, 0440); +MODULE_PARM_DESC(hwrng_seed, "Turn on/off hwrng auto seed, default is 1 (on)."); + +DEFINE_SPINLOCK(zcrypt_list_lock); +LIST_HEAD(zcrypt_card_list); +int zcrypt_device_count; + +static atomic_t zcrypt_open_count = ATOMIC_INIT(0); +static atomic_t zcrypt_rescan_count = ATOMIC_INIT(0); + +atomic_t zcrypt_rescan_req = ATOMIC_INIT(0); +EXPORT_SYMBOL(zcrypt_rescan_req); + +static LIST_HEAD(zcrypt_ops_list); + +/* Zcrypt related debug feature stuff. */ +debug_info_t *zcrypt_dbf_info; + +/** + * Process a rescan of the transport layer. + * + * Returns 1, if the rescan has been processed, otherwise 0. + */ +static inline int zcrypt_process_rescan(void) +{ + if (atomic_read(&zcrypt_rescan_req)) { + atomic_set(&zcrypt_rescan_req, 0); + atomic_inc(&zcrypt_rescan_count); + ap_bus_force_rescan(); + ZCRYPT_DBF(DBF_INFO, "rescan count=%07d\n", + atomic_inc_return(&zcrypt_rescan_count)); + return 1; + } + return 0; +} + +void zcrypt_msgtype_register(struct zcrypt_ops *zops) +{ + list_add_tail(&zops->list, &zcrypt_ops_list); +} + +void zcrypt_msgtype_unregister(struct zcrypt_ops *zops) +{ + list_del_init(&zops->list); +} + +struct zcrypt_ops *zcrypt_msgtype(unsigned char *name, int variant) +{ + struct zcrypt_ops *zops; + + list_for_each_entry(zops, &zcrypt_ops_list, list) + if ((zops->variant == variant) && + (!strncmp(zops->name, name, sizeof(zops->name)))) + return zops; + return NULL; +} +EXPORT_SYMBOL(zcrypt_msgtype); + +/** + * zcrypt_read (): Not supported beyond zcrypt 1.3.1. + * + * This function is not supported beyond zcrypt 1.3.1. + */ +static ssize_t zcrypt_read(struct file *filp, char __user *buf, + size_t count, loff_t *f_pos) +{ + return -EPERM; +} + +/** + * zcrypt_write(): Not allowed. + * + * Write is is not allowed + */ +static ssize_t zcrypt_write(struct file *filp, const char __user *buf, + size_t count, loff_t *f_pos) +{ + return -EPERM; +} + +/** + * zcrypt_open(): Count number of users. + * + * Device open function to count number of users. + */ +static int zcrypt_open(struct inode *inode, struct file *filp) +{ + atomic_inc(&zcrypt_open_count); + return nonseekable_open(inode, filp); +} + +/** + * zcrypt_release(): Count number of users. + * + * Device close function to count number of users. + */ +static int zcrypt_release(struct inode *inode, struct file *filp) +{ + atomic_dec(&zcrypt_open_count); + return 0; +} + +static inline struct zcrypt_queue *zcrypt_pick_queue(struct zcrypt_card *zc, + struct zcrypt_queue *zq, + unsigned int weight) +{ + if (!zq || !try_module_get(zq->queue->ap_dev.drv->driver.owner)) + return NULL; + zcrypt_queue_get(zq); + get_device(&zq->queue->ap_dev.device); + atomic_add(weight, &zc->load); + atomic_add(weight, &zq->load); + zq->request_count++; + return zq; +} + +static inline void zcrypt_drop_queue(struct zcrypt_card *zc, + struct zcrypt_queue *zq, + unsigned int weight) +{ + struct module *mod = zq->queue->ap_dev.drv->driver.owner; + + zq->request_count--; + atomic_sub(weight, &zc->load); + atomic_sub(weight, &zq->load); + put_device(&zq->queue->ap_dev.device); + zcrypt_queue_put(zq); + module_put(mod); +} + +static inline bool zcrypt_card_compare(struct zcrypt_card *zc, + struct zcrypt_card *pref_zc, + unsigned int weight, + unsigned int pref_weight) +{ + if (!pref_zc) + return false; + weight += atomic_read(&zc->load); + pref_weight += atomic_read(&pref_zc->load); + if (weight == pref_weight) + return atomic64_read(&zc->card->total_request_count) > + atomic64_read(&pref_zc->card->total_request_count); + return weight > pref_weight; +} + +static inline bool zcrypt_queue_compare(struct zcrypt_queue *zq, + struct zcrypt_queue *pref_zq, + unsigned int weight, + unsigned int pref_weight) +{ + if (!pref_zq) + return false; + weight += atomic_read(&zq->load); + pref_weight += atomic_read(&pref_zq->load); + if (weight == pref_weight) + return zq->queue->total_request_count > + pref_zq->queue->total_request_count; + return weight > pref_weight; +} + +/* + * zcrypt ioctls. + */ +static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex) +{ + struct zcrypt_card *zc, *pref_zc; + struct zcrypt_queue *zq, *pref_zq; + unsigned int weight, pref_weight; + unsigned int func_code; + int qid = 0, rc = -ENODEV; + + trace_s390_zcrypt_req(mex, TP_ICARSAMODEXPO); + + if (mex->outputdatalength < mex->inputdatalength) { + func_code = 0; + rc = -EINVAL; + goto out; + } + + /* + * As long as outputdatalength is big enough, we can set the + * outputdatalength equal to the inputdatalength, since that is the + * number of bytes we will copy in any case + */ + mex->outputdatalength = mex->inputdatalength; + + rc = get_rsa_modex_fc(mex, &func_code); + if (rc) + goto out; + + pref_zc = NULL; + pref_zq = NULL; + spin_lock(&zcrypt_list_lock); + for_each_zcrypt_card(zc) { + /* Check for online accelarator and CCA cards */ + if (!zc->online || !(zc->card->functions & 0x18000000)) + continue; + /* Check for size limits */ + if (zc->min_mod_size > mex->inputdatalength || + zc->max_mod_size < mex->inputdatalength) + continue; + /* get weight index of the card device */ + weight = zc->speed_rating[func_code]; + if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight)) + continue; + for_each_zcrypt_queue(zq, zc) { + /* check if device is online and eligible */ + if (!zq->online || !zq->ops->rsa_modexpo) + continue; + if (zcrypt_queue_compare(zq, pref_zq, + weight, pref_weight)) + continue; + pref_zc = zc; + pref_zq = zq; + pref_weight = weight; + } + } + pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, weight); + spin_unlock(&zcrypt_list_lock); + + if (!pref_zq) { + rc = -ENODEV; + goto out; + } + + qid = pref_zq->queue->qid; + rc = pref_zq->ops->rsa_modexpo(pref_zq, mex); + + spin_lock(&zcrypt_list_lock); + zcrypt_drop_queue(pref_zc, pref_zq, weight); + spin_unlock(&zcrypt_list_lock); + +out: + trace_s390_zcrypt_rep(mex, func_code, rc, + AP_QID_CARD(qid), AP_QID_QUEUE(qid)); + return rc; +} + +static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt) +{ + struct zcrypt_card *zc, *pref_zc; + struct zcrypt_queue *zq, *pref_zq; + unsigned int weight, pref_weight; + unsigned int func_code; + int qid = 0, rc = -ENODEV; + + trace_s390_zcrypt_req(crt, TP_ICARSACRT); + + if (crt->outputdatalength < crt->inputdatalength) { + func_code = 0; + rc = -EINVAL; + goto out; + } + + /* + * As long as outputdatalength is big enough, we can set the + * outputdatalength equal to the inputdatalength, since that is the + * number of bytes we will copy in any case + */ + crt->outputdatalength = crt->inputdatalength; + + rc = get_rsa_crt_fc(crt, &func_code); + if (rc) + goto out; + + pref_zc = NULL; + pref_zq = NULL; + spin_lock(&zcrypt_list_lock); + for_each_zcrypt_card(zc) { + /* Check for online accelarator and CCA cards */ + if (!zc->online || !(zc->card->functions & 0x18000000)) + continue; + /* Check for size limits */ + if (zc->min_mod_size > crt->inputdatalength || + zc->max_mod_size < crt->inputdatalength) + continue; + /* get weight index of the card device */ + weight = zc->speed_rating[func_code]; + if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight)) + continue; + for_each_zcrypt_queue(zq, zc) { + /* check if device is online and eligible */ + if (!zq->online || !zq->ops->rsa_modexpo_crt) + continue; + if (zcrypt_queue_compare(zq, pref_zq, + weight, pref_weight)) + continue; + pref_zc = zc; + pref_zq = zq; + pref_weight = weight; + } + } + pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, weight); + spin_unlock(&zcrypt_list_lock); + + if (!pref_zq) { + rc = -ENODEV; + goto out; + } + + qid = pref_zq->queue->qid; + rc = pref_zq->ops->rsa_modexpo_crt(pref_zq, crt); + + spin_lock(&zcrypt_list_lock); + zcrypt_drop_queue(pref_zc, pref_zq, weight); + spin_unlock(&zcrypt_list_lock); + +out: + trace_s390_zcrypt_rep(crt, func_code, rc, + AP_QID_CARD(qid), AP_QID_QUEUE(qid)); + return rc; +} + +long zcrypt_send_cprb(struct ica_xcRB *xcRB) +{ + struct zcrypt_card *zc, *pref_zc; + struct zcrypt_queue *zq, *pref_zq; + struct ap_message ap_msg; + unsigned int weight, pref_weight; + unsigned int func_code; + unsigned short *domain; + int qid = 0, rc = -ENODEV; + + trace_s390_zcrypt_req(xcRB, TB_ZSECSENDCPRB); + + ap_init_message(&ap_msg); + rc = get_cprb_fc(xcRB, &ap_msg, &func_code, &domain); + if (rc) + goto out; + + pref_zc = NULL; + pref_zq = NULL; + spin_lock(&zcrypt_list_lock); + for_each_zcrypt_card(zc) { + /* Check for online CCA cards */ + if (!zc->online || !(zc->card->functions & 0x10000000)) + continue; + /* Check for user selected CCA card */ + if (xcRB->user_defined != AUTOSELECT && + xcRB->user_defined != zc->card->id) + continue; + /* get weight index of the card device */ + weight = speed_idx_cca(func_code) * zc->speed_rating[SECKEY]; + if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight)) + continue; + for_each_zcrypt_queue(zq, zc) { + /* check if device is online and eligible */ + if (!zq->online || + !zq->ops->send_cprb || + ((*domain != (unsigned short) AUTOSELECT) && + (*domain != AP_QID_QUEUE(zq->queue->qid)))) + continue; + if (zcrypt_queue_compare(zq, pref_zq, + weight, pref_weight)) + continue; + pref_zc = zc; + pref_zq = zq; + pref_weight = weight; + } + } + pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, weight); + spin_unlock(&zcrypt_list_lock); + + if (!pref_zq) { + rc = -ENODEV; + goto out; + } + + /* in case of auto select, provide the correct domain */ + qid = pref_zq->queue->qid; + if (*domain == (unsigned short) AUTOSELECT) + *domain = AP_QID_QUEUE(qid); + + rc = pref_zq->ops->send_cprb(pref_zq, xcRB, &ap_msg); + + spin_lock(&zcrypt_list_lock); + zcrypt_drop_queue(pref_zc, pref_zq, weight); + spin_unlock(&zcrypt_list_lock); + +out: + ap_release_message(&ap_msg); + trace_s390_zcrypt_rep(xcRB, func_code, rc, + AP_QID_CARD(qid), AP_QID_QUEUE(qid)); + return rc; +} +EXPORT_SYMBOL(zcrypt_send_cprb); + +static bool is_desired_ep11_card(unsigned int dev_id, + unsigned short target_num, + struct ep11_target_dev *targets) +{ + while (target_num-- > 0) { + if (dev_id == targets->ap_id) + return true; + targets++; + } + return false; +} + +static bool is_desired_ep11_queue(unsigned int dev_qid, + unsigned short target_num, + struct ep11_target_dev *targets) +{ + while (target_num-- > 0) { + if (AP_MKQID(targets->ap_id, targets->dom_id) == dev_qid) + return true; + targets++; + } + return false; +} + +static long zcrypt_send_ep11_cprb(struct ep11_urb *xcrb) +{ + struct zcrypt_card *zc, *pref_zc; + struct zcrypt_queue *zq, *pref_zq; + struct ep11_target_dev *targets; + unsigned short target_num; + unsigned int weight, pref_weight; + unsigned int func_code; + struct ap_message ap_msg; + int qid = 0, rc = -ENODEV; + + trace_s390_zcrypt_req(xcrb, TP_ZSENDEP11CPRB); + + ap_init_message(&ap_msg); + + target_num = (unsigned short) xcrb->targets_num; + + /* empty list indicates autoselect (all available targets) */ + targets = NULL; + if (target_num != 0) { + struct ep11_target_dev __user *uptr; + + targets = kcalloc(target_num, sizeof(*targets), GFP_KERNEL); + if (!targets) { + func_code = 0; + rc = -ENOMEM; + goto out; + } + + uptr = (struct ep11_target_dev __force __user *) xcrb->targets; + if (copy_from_user(targets, uptr, + target_num * sizeof(*targets))) { + func_code = 0; + rc = -EFAULT; + goto out_free; + } + } + + rc = get_ep11cprb_fc(xcrb, &ap_msg, &func_code); + if (rc) + goto out_free; + + pref_zc = NULL; + pref_zq = NULL; + spin_lock(&zcrypt_list_lock); + for_each_zcrypt_card(zc) { + /* Check for online EP11 cards */ + if (!zc->online || !(zc->card->functions & 0x04000000)) + continue; + /* Check for user selected EP11 card */ + if (targets && + !is_desired_ep11_card(zc->card->id, target_num, targets)) + continue; + /* get weight index of the card device */ + weight = speed_idx_ep11(func_code) * zc->speed_rating[SECKEY]; + if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight)) + continue; + for_each_zcrypt_queue(zq, zc) { + /* check if device is online and eligible */ + if (!zq->online || + !zq->ops->send_ep11_cprb || + (targets && + !is_desired_ep11_queue(zq->queue->qid, + target_num, targets))) + continue; + if (zcrypt_queue_compare(zq, pref_zq, + weight, pref_weight)) + continue; + pref_zc = zc; + pref_zq = zq; + pref_weight = weight; + } + } + pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, weight); + spin_unlock(&zcrypt_list_lock); + + if (!pref_zq) { + rc = -ENODEV; + goto out_free; + } + + qid = pref_zq->queue->qid; + rc = pref_zq->ops->send_ep11_cprb(pref_zq, xcrb, &ap_msg); + + spin_lock(&zcrypt_list_lock); + zcrypt_drop_queue(pref_zc, pref_zq, weight); + spin_unlock(&zcrypt_list_lock); + +out_free: + kfree(targets); +out: + ap_release_message(&ap_msg); + trace_s390_zcrypt_rep(xcrb, func_code, rc, + AP_QID_CARD(qid), AP_QID_QUEUE(qid)); + return rc; +} + +static long zcrypt_rng(char *buffer) +{ + struct zcrypt_card *zc, *pref_zc; + struct zcrypt_queue *zq, *pref_zq; + unsigned int weight, pref_weight; + unsigned int func_code; + struct ap_message ap_msg; + unsigned int domain; + int qid = 0, rc = -ENODEV; + + trace_s390_zcrypt_req(buffer, TP_HWRNGCPRB); + + ap_init_message(&ap_msg); + rc = get_rng_fc(&ap_msg, &func_code, &domain); + if (rc) + goto out; + + pref_zc = NULL; + pref_zq = NULL; + spin_lock(&zcrypt_list_lock); + for_each_zcrypt_card(zc) { + /* Check for online CCA cards */ + if (!zc->online || !(zc->card->functions & 0x10000000)) + continue; + /* get weight index of the card device */ + weight = zc->speed_rating[func_code]; + if (zcrypt_card_compare(zc, pref_zc, weight, pref_weight)) + continue; + for_each_zcrypt_queue(zq, zc) { + /* check if device is online and eligible */ + if (!zq->online || !zq->ops->rng) + continue; + if (zcrypt_queue_compare(zq, pref_zq, + weight, pref_weight)) + continue; + pref_zc = zc; + pref_zq = zq; + pref_weight = weight; + } + } + pref_zq = zcrypt_pick_queue(pref_zc, pref_zq, weight); + spin_unlock(&zcrypt_list_lock); + + if (!pref_zq) { + rc = -ENODEV; + goto out; + } + + qid = pref_zq->queue->qid; + rc = pref_zq->ops->rng(pref_zq, buffer, &ap_msg); + + spin_lock(&zcrypt_list_lock); + zcrypt_drop_queue(pref_zc, pref_zq, weight); + spin_unlock(&zcrypt_list_lock); + +out: + ap_release_message(&ap_msg); + trace_s390_zcrypt_rep(buffer, func_code, rc, + AP_QID_CARD(qid), AP_QID_QUEUE(qid)); + return rc; +} + +static void zcrypt_device_status_mask(struct zcrypt_device_status *devstatus) +{ + struct zcrypt_card *zc; + struct zcrypt_queue *zq; + struct zcrypt_device_status *stat; + int card, queue; + + memset(devstatus, 0, MAX_ZDEV_ENTRIES + * sizeof(struct zcrypt_device_status)); + + spin_lock(&zcrypt_list_lock); + for_each_zcrypt_card(zc) { + for_each_zcrypt_queue(zq, zc) { + card = AP_QID_CARD(zq->queue->qid); + if (card >= MAX_ZDEV_CARDIDS) + continue; + queue = AP_QID_QUEUE(zq->queue->qid); + stat = &devstatus[card * AP_DOMAINS + queue]; + stat->hwtype = zc->card->ap_dev.device_type; + stat->functions = zc->card->functions >> 26; + stat->qid = zq->queue->qid; + stat->online = zq->online ? 0x01 : 0x00; + } + } + spin_unlock(&zcrypt_list_lock); +} + +void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus) +{ + struct zcrypt_card *zc; + struct zcrypt_queue *zq; + struct zcrypt_device_status_ext *stat; + int card, queue; + + memset(devstatus, 0, MAX_ZDEV_ENTRIES_EXT + * sizeof(struct zcrypt_device_status_ext)); + + spin_lock(&zcrypt_list_lock); + for_each_zcrypt_card(zc) { + for_each_zcrypt_queue(zq, zc) { + card = AP_QID_CARD(zq->queue->qid); + queue = AP_QID_QUEUE(zq->queue->qid); + stat = &devstatus[card * AP_DOMAINS + queue]; + stat->hwtype = zc->card->ap_dev.device_type; + stat->functions = zc->card->functions >> 26; + stat->qid = zq->queue->qid; + stat->online = zq->online ? 0x01 : 0x00; + } + } + spin_unlock(&zcrypt_list_lock); +} +EXPORT_SYMBOL(zcrypt_device_status_mask_ext); + +static void zcrypt_status_mask(char status[], size_t max_adapters) +{ + struct zcrypt_card *zc; + struct zcrypt_queue *zq; + int card; + + memset(status, 0, max_adapters); + spin_lock(&zcrypt_list_lock); + for_each_zcrypt_card(zc) { + for_each_zcrypt_queue(zq, zc) { + card = AP_QID_CARD(zq->queue->qid); + if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index + || card >= max_adapters) + continue; + status[card] = zc->online ? zc->user_space_type : 0x0d; + } + } + spin_unlock(&zcrypt_list_lock); +} + +static void zcrypt_qdepth_mask(char qdepth[], size_t max_adapters) +{ + struct zcrypt_card *zc; + struct zcrypt_queue *zq; + int card; + + memset(qdepth, 0, max_adapters); + spin_lock(&zcrypt_list_lock); + local_bh_disable(); + for_each_zcrypt_card(zc) { + for_each_zcrypt_queue(zq, zc) { + card = AP_QID_CARD(zq->queue->qid); + if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index + || card >= max_adapters) + continue; + spin_lock(&zq->queue->lock); + qdepth[card] = + zq->queue->pendingq_count + + zq->queue->requestq_count; + spin_unlock(&zq->queue->lock); + } + } + local_bh_enable(); + spin_unlock(&zcrypt_list_lock); +} + +static void zcrypt_perdev_reqcnt(u32 reqcnt[], size_t max_adapters) +{ + struct zcrypt_card *zc; + struct zcrypt_queue *zq; + int card; + u64 cnt; + + memset(reqcnt, 0, sizeof(int) * max_adapters); + spin_lock(&zcrypt_list_lock); + local_bh_disable(); + for_each_zcrypt_card(zc) { + for_each_zcrypt_queue(zq, zc) { + card = AP_QID_CARD(zq->queue->qid); + if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index + || card >= max_adapters) + continue; + spin_lock(&zq->queue->lock); + cnt = zq->queue->total_request_count; + spin_unlock(&zq->queue->lock); + reqcnt[card] = (cnt < UINT_MAX) ? (u32) cnt : UINT_MAX; + } + } + local_bh_enable(); + spin_unlock(&zcrypt_list_lock); +} + +static int zcrypt_pendingq_count(void) +{ + struct zcrypt_card *zc; + struct zcrypt_queue *zq; + int pendingq_count; + + pendingq_count = 0; + spin_lock(&zcrypt_list_lock); + local_bh_disable(); + for_each_zcrypt_card(zc) { + for_each_zcrypt_queue(zq, zc) { + if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index) + continue; + spin_lock(&zq->queue->lock); + pendingq_count += zq->queue->pendingq_count; + spin_unlock(&zq->queue->lock); + } + } + local_bh_enable(); + spin_unlock(&zcrypt_list_lock); + return pendingq_count; +} + +static int zcrypt_requestq_count(void) +{ + struct zcrypt_card *zc; + struct zcrypt_queue *zq; + int requestq_count; + + requestq_count = 0; + spin_lock(&zcrypt_list_lock); + local_bh_disable(); + for_each_zcrypt_card(zc) { + for_each_zcrypt_queue(zq, zc) { + if (AP_QID_QUEUE(zq->queue->qid) != ap_domain_index) + continue; + spin_lock(&zq->queue->lock); + requestq_count += zq->queue->requestq_count; + spin_unlock(&zq->queue->lock); + } + } + local_bh_enable(); + spin_unlock(&zcrypt_list_lock); + return requestq_count; +} + +static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + int rc = 0; + + switch (cmd) { + case ICARSAMODEXPO: { + struct ica_rsa_modexpo __user *umex = (void __user *) arg; + struct ica_rsa_modexpo mex; + + if (copy_from_user(&mex, umex, sizeof(mex))) + return -EFAULT; + do { + rc = zcrypt_rsa_modexpo(&mex); + } while (rc == -EAGAIN); + /* on failure: retry once again after a requested rescan */ + if ((rc == -ENODEV) && (zcrypt_process_rescan())) + do { + rc = zcrypt_rsa_modexpo(&mex); + } while (rc == -EAGAIN); + if (rc) { + ZCRYPT_DBF(DBF_DEBUG, "ioctl ICARSAMODEXPO rc=%d\n", rc); + return rc; + } + return put_user(mex.outputdatalength, &umex->outputdatalength); + } + case ICARSACRT: { + struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg; + struct ica_rsa_modexpo_crt crt; + + if (copy_from_user(&crt, ucrt, sizeof(crt))) + return -EFAULT; + do { + rc = zcrypt_rsa_crt(&crt); + } while (rc == -EAGAIN); + /* on failure: retry once again after a requested rescan */ + if ((rc == -ENODEV) && (zcrypt_process_rescan())) + do { + rc = zcrypt_rsa_crt(&crt); + } while (rc == -EAGAIN); + if (rc) { + ZCRYPT_DBF(DBF_DEBUG, "ioctl ICARSACRT rc=%d\n", rc); + return rc; + } + return put_user(crt.outputdatalength, &ucrt->outputdatalength); + } + case ZSECSENDCPRB: { + struct ica_xcRB __user *uxcRB = (void __user *) arg; + struct ica_xcRB xcRB; + + if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB))) + return -EFAULT; + do { + rc = zcrypt_send_cprb(&xcRB); + } while (rc == -EAGAIN); + /* on failure: retry once again after a requested rescan */ + if ((rc == -ENODEV) && (zcrypt_process_rescan())) + do { + rc = zcrypt_send_cprb(&xcRB); + } while (rc == -EAGAIN); + if (rc) + ZCRYPT_DBF(DBF_DEBUG, "ioctl ZSENDCPRB rc=%d\n", rc); + if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB))) + return -EFAULT; + return rc; + } + case ZSENDEP11CPRB: { + struct ep11_urb __user *uxcrb = (void __user *)arg; + struct ep11_urb xcrb; + + if (copy_from_user(&xcrb, uxcrb, sizeof(xcrb))) + return -EFAULT; + do { + rc = zcrypt_send_ep11_cprb(&xcrb); + } while (rc == -EAGAIN); + /* on failure: retry once again after a requested rescan */ + if ((rc == -ENODEV) && (zcrypt_process_rescan())) + do { + rc = zcrypt_send_ep11_cprb(&xcrb); + } while (rc == -EAGAIN); + if (rc) + ZCRYPT_DBF(DBF_DEBUG, "ioctl ZSENDEP11CPRB rc=%d\n", rc); + if (copy_to_user(uxcrb, &xcrb, sizeof(xcrb))) + return -EFAULT; + return rc; + } + case ZCRYPT_DEVICE_STATUS: { + struct zcrypt_device_status_ext *device_status; + size_t total_size = MAX_ZDEV_ENTRIES_EXT + * sizeof(struct zcrypt_device_status_ext); + + device_status = kzalloc(total_size, GFP_KERNEL); + if (!device_status) + return -ENOMEM; + zcrypt_device_status_mask_ext(device_status); + if (copy_to_user((char __user *) arg, device_status, + total_size)) + rc = -EFAULT; + kfree(device_status); + return rc; + } + case ZCRYPT_STATUS_MASK: { + char status[AP_DEVICES]; + + zcrypt_status_mask(status, AP_DEVICES); + if (copy_to_user((char __user *) arg, status, sizeof(status))) + return -EFAULT; + return 0; + } + case ZCRYPT_QDEPTH_MASK: { + char qdepth[AP_DEVICES]; + + zcrypt_qdepth_mask(qdepth, AP_DEVICES); + if (copy_to_user((char __user *) arg, qdepth, sizeof(qdepth))) + return -EFAULT; + return 0; + } + case ZCRYPT_PERDEV_REQCNT: { + u32 *reqcnt; + + reqcnt = kcalloc(AP_DEVICES, sizeof(u32), GFP_KERNEL); + if (!reqcnt) + return -ENOMEM; + zcrypt_perdev_reqcnt(reqcnt, AP_DEVICES); + if (copy_to_user((int __user *) arg, reqcnt, + sizeof(u32) * AP_DEVICES)) + rc = -EFAULT; + kfree(reqcnt); + return rc; + } + case Z90STAT_REQUESTQ_COUNT: + return put_user(zcrypt_requestq_count(), (int __user *) arg); + case Z90STAT_PENDINGQ_COUNT: + return put_user(zcrypt_pendingq_count(), (int __user *) arg); + case Z90STAT_TOTALOPEN_COUNT: + return put_user(atomic_read(&zcrypt_open_count), + (int __user *) arg); + case Z90STAT_DOMAIN_INDEX: + return put_user(ap_domain_index, (int __user *) arg); + /* + * Deprecated ioctls + */ + case ZDEVICESTATUS: { + /* the old ioctl supports only 64 adapters */ + struct zcrypt_device_status *device_status; + size_t total_size = MAX_ZDEV_ENTRIES + * sizeof(struct zcrypt_device_status); + + device_status = kzalloc(total_size, GFP_KERNEL); + if (!device_status) + return -ENOMEM; + zcrypt_device_status_mask(device_status); + if (copy_to_user((char __user *) arg, device_status, + total_size)) + rc = -EFAULT; + kfree(device_status); + return rc; + } + case Z90STAT_STATUS_MASK: { + /* the old ioctl supports only 64 adapters */ + char status[MAX_ZDEV_CARDIDS]; + + zcrypt_status_mask(status, MAX_ZDEV_CARDIDS); + if (copy_to_user((char __user *) arg, status, sizeof(status))) + return -EFAULT; + return 0; + } + case Z90STAT_QDEPTH_MASK: { + /* the old ioctl supports only 64 adapters */ + char qdepth[MAX_ZDEV_CARDIDS]; + + zcrypt_qdepth_mask(qdepth, MAX_ZDEV_CARDIDS); + if (copy_to_user((char __user *) arg, qdepth, sizeof(qdepth))) + return -EFAULT; + return 0; + } + case Z90STAT_PERDEV_REQCNT: { + /* the old ioctl supports only 64 adapters */ + u32 reqcnt[MAX_ZDEV_CARDIDS]; + + zcrypt_perdev_reqcnt(reqcnt, MAX_ZDEV_CARDIDS); + if (copy_to_user((int __user *) arg, reqcnt, sizeof(reqcnt))) + return -EFAULT; + return 0; + } + /* unknown ioctl number */ + default: + ZCRYPT_DBF(DBF_DEBUG, "unknown ioctl 0x%08x\n", cmd); + return -ENOIOCTLCMD; + } +} + +#ifdef CONFIG_COMPAT +/* + * ioctl32 conversion routines + */ +struct compat_ica_rsa_modexpo { + compat_uptr_t inputdata; + unsigned int inputdatalength; + compat_uptr_t outputdata; + unsigned int outputdatalength; + compat_uptr_t b_key; + compat_uptr_t n_modulus; +}; + +static long trans_modexpo32(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg); + struct compat_ica_rsa_modexpo mex32; + struct ica_rsa_modexpo mex64; + long rc; + + if (copy_from_user(&mex32, umex32, sizeof(mex32))) + return -EFAULT; + mex64.inputdata = compat_ptr(mex32.inputdata); + mex64.inputdatalength = mex32.inputdatalength; + mex64.outputdata = compat_ptr(mex32.outputdata); + mex64.outputdatalength = mex32.outputdatalength; + mex64.b_key = compat_ptr(mex32.b_key); + mex64.n_modulus = compat_ptr(mex32.n_modulus); + do { + rc = zcrypt_rsa_modexpo(&mex64); + } while (rc == -EAGAIN); + /* on failure: retry once again after a requested rescan */ + if ((rc == -ENODEV) && (zcrypt_process_rescan())) + do { + rc = zcrypt_rsa_modexpo(&mex64); + } while (rc == -EAGAIN); + if (rc) + return rc; + return put_user(mex64.outputdatalength, + &umex32->outputdatalength); +} + +struct compat_ica_rsa_modexpo_crt { + compat_uptr_t inputdata; + unsigned int inputdatalength; + compat_uptr_t outputdata; + unsigned int outputdatalength; + compat_uptr_t bp_key; + compat_uptr_t bq_key; + compat_uptr_t np_prime; + compat_uptr_t nq_prime; + compat_uptr_t u_mult_inv; +}; + +static long trans_modexpo_crt32(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg); + struct compat_ica_rsa_modexpo_crt crt32; + struct ica_rsa_modexpo_crt crt64; + long rc; + + if (copy_from_user(&crt32, ucrt32, sizeof(crt32))) + return -EFAULT; + crt64.inputdata = compat_ptr(crt32.inputdata); + crt64.inputdatalength = crt32.inputdatalength; + crt64.outputdata = compat_ptr(crt32.outputdata); + crt64.outputdatalength = crt32.outputdatalength; + crt64.bp_key = compat_ptr(crt32.bp_key); + crt64.bq_key = compat_ptr(crt32.bq_key); + crt64.np_prime = compat_ptr(crt32.np_prime); + crt64.nq_prime = compat_ptr(crt32.nq_prime); + crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv); + do { + rc = zcrypt_rsa_crt(&crt64); + } while (rc == -EAGAIN); + /* on failure: retry once again after a requested rescan */ + if ((rc == -ENODEV) && (zcrypt_process_rescan())) + do { + rc = zcrypt_rsa_crt(&crt64); + } while (rc == -EAGAIN); + if (rc) + return rc; + return put_user(crt64.outputdatalength, + &ucrt32->outputdatalength); +} + +struct compat_ica_xcRB { + unsigned short agent_ID; + unsigned int user_defined; + unsigned short request_ID; + unsigned int request_control_blk_length; + unsigned char padding1[16 - sizeof(compat_uptr_t)]; + compat_uptr_t request_control_blk_addr; + unsigned int request_data_length; + char padding2[16 - sizeof(compat_uptr_t)]; + compat_uptr_t request_data_address; + unsigned int reply_control_blk_length; + char padding3[16 - sizeof(compat_uptr_t)]; + compat_uptr_t reply_control_blk_addr; + unsigned int reply_data_length; + char padding4[16 - sizeof(compat_uptr_t)]; + compat_uptr_t reply_data_addr; + unsigned short priority_window; + unsigned int status; +} __packed; + +static long trans_xcRB32(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg); + struct compat_ica_xcRB xcRB32; + struct ica_xcRB xcRB64; + long rc; + + if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32))) + return -EFAULT; + xcRB64.agent_ID = xcRB32.agent_ID; + xcRB64.user_defined = xcRB32.user_defined; + xcRB64.request_ID = xcRB32.request_ID; + xcRB64.request_control_blk_length = + xcRB32.request_control_blk_length; + xcRB64.request_control_blk_addr = + compat_ptr(xcRB32.request_control_blk_addr); + xcRB64.request_data_length = + xcRB32.request_data_length; + xcRB64.request_data_address = + compat_ptr(xcRB32.request_data_address); + xcRB64.reply_control_blk_length = + xcRB32.reply_control_blk_length; + xcRB64.reply_control_blk_addr = + compat_ptr(xcRB32.reply_control_blk_addr); + xcRB64.reply_data_length = xcRB32.reply_data_length; + xcRB64.reply_data_addr = + compat_ptr(xcRB32.reply_data_addr); + xcRB64.priority_window = xcRB32.priority_window; + xcRB64.status = xcRB32.status; + do { + rc = zcrypt_send_cprb(&xcRB64); + } while (rc == -EAGAIN); + /* on failure: retry once again after a requested rescan */ + if ((rc == -ENODEV) && (zcrypt_process_rescan())) + do { + rc = zcrypt_send_cprb(&xcRB64); + } while (rc == -EAGAIN); + xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length; + xcRB32.reply_data_length = xcRB64.reply_data_length; + xcRB32.status = xcRB64.status; + if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32))) + return -EFAULT; + return rc; +} + +static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + if (cmd == ICARSAMODEXPO) + return trans_modexpo32(filp, cmd, arg); + if (cmd == ICARSACRT) + return trans_modexpo_crt32(filp, cmd, arg); + if (cmd == ZSECSENDCPRB) + return trans_xcRB32(filp, cmd, arg); + return zcrypt_unlocked_ioctl(filp, cmd, arg); +} +#endif + +/* + * Misc device file operations. + */ +static const struct file_operations zcrypt_fops = { + .owner = THIS_MODULE, + .read = zcrypt_read, + .write = zcrypt_write, + .unlocked_ioctl = zcrypt_unlocked_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = zcrypt_compat_ioctl, +#endif + .open = zcrypt_open, + .release = zcrypt_release, + .llseek = no_llseek, +}; + +/* + * Misc device. + */ +static struct miscdevice zcrypt_misc_device = { + .minor = MISC_DYNAMIC_MINOR, + .name = "z90crypt", + .fops = &zcrypt_fops, +}; + +static int zcrypt_rng_device_count; +static u32 *zcrypt_rng_buffer; +static int zcrypt_rng_buffer_index; +static DEFINE_MUTEX(zcrypt_rng_mutex); + +static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data) +{ + int rc; + + /* + * We don't need locking here because the RNG API guarantees serialized + * read method calls. + */ + if (zcrypt_rng_buffer_index == 0) { + rc = zcrypt_rng((char *) zcrypt_rng_buffer); + /* on failure: retry once again after a requested rescan */ + if ((rc == -ENODEV) && (zcrypt_process_rescan())) + rc = zcrypt_rng((char *) zcrypt_rng_buffer); + if (rc < 0) + return -EIO; + zcrypt_rng_buffer_index = rc / sizeof(*data); + } + *data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index]; + return sizeof(*data); +} + +static struct hwrng zcrypt_rng_dev = { + .name = "zcrypt", + .data_read = zcrypt_rng_data_read, + .quality = 990, +}; + +int zcrypt_rng_device_add(void) +{ + int rc = 0; + + mutex_lock(&zcrypt_rng_mutex); + if (zcrypt_rng_device_count == 0) { + zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL); + if (!zcrypt_rng_buffer) { + rc = -ENOMEM; + goto out; + } + zcrypt_rng_buffer_index = 0; + if (!zcrypt_hwrng_seed) + zcrypt_rng_dev.quality = 0; + rc = hwrng_register(&zcrypt_rng_dev); + if (rc) + goto out_free; + zcrypt_rng_device_count = 1; + } else + zcrypt_rng_device_count++; + mutex_unlock(&zcrypt_rng_mutex); + return 0; + +out_free: + free_page((unsigned long) zcrypt_rng_buffer); +out: + mutex_unlock(&zcrypt_rng_mutex); + return rc; +} + +void zcrypt_rng_device_remove(void) +{ + mutex_lock(&zcrypt_rng_mutex); + zcrypt_rng_device_count--; + if (zcrypt_rng_device_count == 0) { + hwrng_unregister(&zcrypt_rng_dev); + free_page((unsigned long) zcrypt_rng_buffer); + } + mutex_unlock(&zcrypt_rng_mutex); +} + +int __init zcrypt_debug_init(void) +{ + zcrypt_dbf_info = debug_register("zcrypt", 1, 1, + DBF_MAX_SPRINTF_ARGS * sizeof(long)); + debug_register_view(zcrypt_dbf_info, &debug_sprintf_view); + debug_set_level(zcrypt_dbf_info, DBF_ERR); + + return 0; +} + +void zcrypt_debug_exit(void) +{ + debug_unregister(zcrypt_dbf_info); +} + +/** + * zcrypt_api_init(): Module initialization. + * + * The module initialization code. + */ +int __init zcrypt_api_init(void) +{ + int rc; + + rc = zcrypt_debug_init(); + if (rc) + goto out; + + /* Register the request sprayer. */ + rc = misc_register(&zcrypt_misc_device); + if (rc < 0) + goto out; + + zcrypt_msgtype6_init(); + zcrypt_msgtype50_init(); + return 0; + +out: + return rc; +} + +/** + * zcrypt_api_exit(): Module termination. + * + * The module termination code. + */ +void __exit zcrypt_api_exit(void) +{ + misc_deregister(&zcrypt_misc_device); + zcrypt_msgtype6_exit(); + zcrypt_msgtype50_exit(); + zcrypt_debug_exit(); +} + +module_init(zcrypt_api_init); +module_exit(zcrypt_api_exit); diff --git a/drivers/s390/crypto/zcrypt_api.h b/drivers/s390/crypto/zcrypt_api.h new file mode 100644 index 000000000..a848625c1 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_api.h @@ -0,0 +1,160 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * Cornelia Huck + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * Ralph Wuerthner + * MSGTYPE restruct: Holger Dengler + */ + +#ifndef _ZCRYPT_API_H_ +#define _ZCRYPT_API_H_ + +#include +#include +#include +#include "ap_bus.h" + +/** + * device type for an actual device is either PCICA, PCICC, PCIXCC_MCL2, + * PCIXCC_MCL3, CEX2C, or CEX2A + * + * NOTE: PCIXCC_MCL3 refers to a PCIXCC with May 2004 version of Licensed + * Internal Code (LIC) (EC J12220 level 29). + * PCIXCC_MCL2 refers to any LIC before this level. + */ +#define ZCRYPT_PCICA 1 +#define ZCRYPT_PCICC 2 +#define ZCRYPT_PCIXCC_MCL2 3 +#define ZCRYPT_PCIXCC_MCL3 4 +#define ZCRYPT_CEX2C 5 +#define ZCRYPT_CEX2A 6 +#define ZCRYPT_CEX3C 7 +#define ZCRYPT_CEX3A 8 +#define ZCRYPT_CEX4 10 +#define ZCRYPT_CEX5 11 +#define ZCRYPT_CEX6 12 + +/** + * Large random numbers are pulled in 4096 byte chunks from the crypto cards + * and stored in a page. Be careful when increasing this buffer due to size + * limitations for AP requests. + */ +#define ZCRYPT_RNG_BUFFER_SIZE 4096 + +/* + * Identifier for Crypto Request Performance Index + */ +enum crypto_ops { + MEX_1K, + MEX_2K, + MEX_4K, + CRT_1K, + CRT_2K, + CRT_4K, + HWRNG, + SECKEY, + NUM_OPS +}; + +struct zcrypt_queue; + +struct zcrypt_ops { + long (*rsa_modexpo)(struct zcrypt_queue *, struct ica_rsa_modexpo *); + long (*rsa_modexpo_crt)(struct zcrypt_queue *, + struct ica_rsa_modexpo_crt *); + long (*send_cprb)(struct zcrypt_queue *, struct ica_xcRB *, + struct ap_message *); + long (*send_ep11_cprb)(struct zcrypt_queue *, struct ep11_urb *, + struct ap_message *); + long (*rng)(struct zcrypt_queue *, char *, struct ap_message *); + struct list_head list; /* zcrypt ops list. */ + struct module *owner; + int variant; + char name[128]; +}; + +struct zcrypt_card { + struct list_head list; /* Device list. */ + struct list_head zqueues; /* List of zcrypt queues */ + struct kref refcount; /* device refcounting */ + struct ap_card *card; /* The "real" ap card device. */ + int online; /* User online/offline */ + + int user_space_type; /* User space device id. */ + char *type_string; /* User space device name. */ + int min_mod_size; /* Min number of bits. */ + int max_mod_size; /* Max number of bits. */ + int max_exp_bit_length; + int speed_rating[NUM_OPS]; /* Speed idx of crypto ops. */ + atomic_t load; /* Utilization of the crypto device */ + + int request_count; /* # current requests. */ +}; + +struct zcrypt_queue { + struct list_head list; /* Device list. */ + struct kref refcount; /* device refcounting */ + struct zcrypt_card *zcard; + struct zcrypt_ops *ops; /* Crypto operations. */ + struct ap_queue *queue; /* The "real" ap queue device. */ + int online; /* User online/offline */ + + atomic_t load; /* Utilization of the crypto device */ + + int request_count; /* # current requests. */ + + struct ap_message reply; /* Per-device reply structure. */ +}; + +/* transport layer rescanning */ +extern atomic_t zcrypt_rescan_req; + +extern spinlock_t zcrypt_list_lock; +extern int zcrypt_device_count; +extern struct list_head zcrypt_card_list; + +#define for_each_zcrypt_card(_zc) \ + list_for_each_entry(_zc, &zcrypt_card_list, list) + +#define for_each_zcrypt_queue(_zq, _zc) \ + list_for_each_entry(_zq, &(_zc)->zqueues, list) + +struct zcrypt_card *zcrypt_card_alloc(void); +void zcrypt_card_free(struct zcrypt_card *); +void zcrypt_card_get(struct zcrypt_card *); +int zcrypt_card_put(struct zcrypt_card *); +int zcrypt_card_register(struct zcrypt_card *); +void zcrypt_card_unregister(struct zcrypt_card *); +struct zcrypt_card *zcrypt_card_get_best(unsigned int *, + unsigned int, unsigned int); +void zcrypt_card_put_best(struct zcrypt_card *, unsigned int); + +struct zcrypt_queue *zcrypt_queue_alloc(size_t); +void zcrypt_queue_free(struct zcrypt_queue *); +void zcrypt_queue_get(struct zcrypt_queue *); +int zcrypt_queue_put(struct zcrypt_queue *); +int zcrypt_queue_register(struct zcrypt_queue *); +void zcrypt_queue_unregister(struct zcrypt_queue *); +void zcrypt_queue_force_online(struct zcrypt_queue *, int); +struct zcrypt_queue *zcrypt_queue_get_best(unsigned int, unsigned int); +void zcrypt_queue_put_best(struct zcrypt_queue *, unsigned int); + +int zcrypt_rng_device_add(void); +void zcrypt_rng_device_remove(void); + +void zcrypt_msgtype_register(struct zcrypt_ops *); +void zcrypt_msgtype_unregister(struct zcrypt_ops *); +struct zcrypt_ops *zcrypt_msgtype(unsigned char *, int); +int zcrypt_api_init(void); +void zcrypt_api_exit(void); +long zcrypt_send_cprb(struct ica_xcRB *xcRB); +void zcrypt_device_status_mask_ext(struct zcrypt_device_status_ext *devstatus); + +#endif /* _ZCRYPT_API_H_ */ diff --git a/drivers/s390/crypto/zcrypt_card.c b/drivers/s390/crypto/zcrypt_card.c new file mode 100644 index 000000000..40cd4c1c2 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_card.c @@ -0,0 +1,189 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * Cornelia Huck + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * Ralph Wuerthner + * MSGTYPE restruct: Holger Dengler + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "zcrypt_debug.h" +#include "zcrypt_api.h" + +#include "zcrypt_msgtype6.h" +#include "zcrypt_msgtype50.h" + +/* + * Device attributes common for all crypto card devices. + */ + +static ssize_t type_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct zcrypt_card *zc = to_ap_card(dev)->private; + + return snprintf(buf, PAGE_SIZE, "%s\n", zc->type_string); +} + +static DEVICE_ATTR_RO(type); + +static ssize_t online_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct zcrypt_card *zc = to_ap_card(dev)->private; + + return snprintf(buf, PAGE_SIZE, "%d\n", zc->online); +} + +static ssize_t online_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct zcrypt_card *zc = to_ap_card(dev)->private; + struct zcrypt_queue *zq; + int online, id; + + if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1) + return -EINVAL; + + zc->online = online; + id = zc->card->id; + + ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online); + + spin_lock(&zcrypt_list_lock); + list_for_each_entry(zq, &zc->zqueues, list) + zcrypt_queue_force_online(zq, online); + spin_unlock(&zcrypt_list_lock); + return count; +} + +static DEVICE_ATTR_RW(online); + +static ssize_t load_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct zcrypt_card *zc = to_ap_card(dev)->private; + + return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load)); +} + +static DEVICE_ATTR_RO(load); + +static struct attribute *zcrypt_card_attrs[] = { + &dev_attr_type.attr, + &dev_attr_online.attr, + &dev_attr_load.attr, + NULL, +}; + +static const struct attribute_group zcrypt_card_attr_group = { + .attrs = zcrypt_card_attrs, +}; + +struct zcrypt_card *zcrypt_card_alloc(void) +{ + struct zcrypt_card *zc; + + zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL); + if (!zc) + return NULL; + INIT_LIST_HEAD(&zc->list); + INIT_LIST_HEAD(&zc->zqueues); + kref_init(&zc->refcount); + return zc; +} +EXPORT_SYMBOL(zcrypt_card_alloc); + +void zcrypt_card_free(struct zcrypt_card *zc) +{ + kfree(zc); +} +EXPORT_SYMBOL(zcrypt_card_free); + +static void zcrypt_card_release(struct kref *kref) +{ + struct zcrypt_card *zdev = + container_of(kref, struct zcrypt_card, refcount); + zcrypt_card_free(zdev); +} + +void zcrypt_card_get(struct zcrypt_card *zc) +{ + kref_get(&zc->refcount); +} +EXPORT_SYMBOL(zcrypt_card_get); + +int zcrypt_card_put(struct zcrypt_card *zc) +{ + return kref_put(&zc->refcount, zcrypt_card_release); +} +EXPORT_SYMBOL(zcrypt_card_put); + +/** + * zcrypt_card_register() - Register a crypto card device. + * @zc: Pointer to a crypto card device + * + * Register a crypto card device. Returns 0 if successful. + */ +int zcrypt_card_register(struct zcrypt_card *zc) +{ + int rc; + + rc = sysfs_create_group(&zc->card->ap_dev.device.kobj, + &zcrypt_card_attr_group); + if (rc) + return rc; + + spin_lock(&zcrypt_list_lock); + list_add_tail(&zc->list, &zcrypt_card_list); + spin_unlock(&zcrypt_list_lock); + + zc->online = 1; + + ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id); + + return rc; +} +EXPORT_SYMBOL(zcrypt_card_register); + +/** + * zcrypt_card_unregister(): Unregister a crypto card device. + * @zc: Pointer to crypto card device + * + * Unregister a crypto card device. + */ +void zcrypt_card_unregister(struct zcrypt_card *zc) +{ + ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id); + + spin_lock(&zcrypt_list_lock); + list_del_init(&zc->list); + spin_unlock(&zcrypt_list_lock); + sysfs_remove_group(&zc->card->ap_dev.device.kobj, + &zcrypt_card_attr_group); +} +EXPORT_SYMBOL(zcrypt_card_unregister); diff --git a/drivers/s390/crypto/zcrypt_cca_key.h b/drivers/s390/crypto/zcrypt_cca_key.h new file mode 100644 index 000000000..e5b5c02c9 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_cca_key.h @@ -0,0 +1,250 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2006 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + */ + +#ifndef _ZCRYPT_CCA_KEY_H_ +#define _ZCRYPT_CCA_KEY_H_ + +struct T6_keyBlock_hdr { + unsigned short blen; + unsigned short ulen; + unsigned short flags; +}; + +/** + * mapping for the cca private ME key token. + * Three parts of interest here: the header, the private section and + * the public section. + * + * mapping for the cca key token header + */ +struct cca_token_hdr { + unsigned char token_identifier; + unsigned char version; + unsigned short token_length; + unsigned char reserved[4]; +} __packed; + +#define CCA_TKN_HDR_ID_EXT 0x1E + +#define CCA_PVT_USAGE_ALL 0x80 + +/** + * mapping for the cca public section + * In a private key, the modulus doesn't appear in the public + * section. So, an arbitrary public exponent of 0x010001 will be + * used, for a section length of 0x0F always. + */ +struct cca_public_sec { + unsigned char section_identifier; + unsigned char version; + unsigned short section_length; + unsigned char reserved[2]; + unsigned short exponent_len; + unsigned short modulus_bit_len; + unsigned short modulus_byte_len; /* In a private key, this is 0 */ +} __packed; + +/** + * mapping for the cca private CRT key 'token' + * The first three parts (the only parts considered in this release) + * are: the header, the private section and the public section. + * The header and public section are the same as for the + * struct cca_private_ext_ME + * + * Following the structure are the quantities p, q, dp, dq, u, pad, + * and modulus, in that order, where pad_len is the modulo 8 + * complement of the residue modulo 8 of the sum of + * (p_len + q_len + dp_len + dq_len + u_len). + */ +struct cca_pvt_ext_CRT_sec { + unsigned char section_identifier; + unsigned char version; + unsigned short section_length; + unsigned char private_key_hash[20]; + unsigned char reserved1[4]; + unsigned char key_format; + unsigned char reserved2; + unsigned char key_name_hash[20]; + unsigned char key_use_flags[4]; + unsigned short p_len; + unsigned short q_len; + unsigned short dp_len; + unsigned short dq_len; + unsigned short u_len; + unsigned short mod_len; + unsigned char reserved3[4]; + unsigned short pad_len; + unsigned char reserved4[52]; + unsigned char confounder[8]; +} __packed; + +#define CCA_PVT_EXT_CRT_SEC_ID_PVT 0x08 +#define CCA_PVT_EXT_CRT_SEC_FMT_CL 0x40 + +/** + * Set up private key fields of a type6 MEX message. The _pad variant + * strips leading zeroes from the b_key. + * Note that all numerics in the key token are big-endian, + * while the entries in the key block header are little-endian. + * + * @mex: pointer to user input data + * @p: pointer to memory area for the key + * + * Returns the size of the key area or negative errno value. + */ +static inline int zcrypt_type6_mex_key_en(struct ica_rsa_modexpo *mex, void *p) +{ + static struct cca_token_hdr static_pub_hdr = { + .token_identifier = 0x1E, + }; + static struct cca_public_sec static_pub_sec = { + .section_identifier = 0x04, + }; + struct { + struct T6_keyBlock_hdr t6_hdr; + struct cca_token_hdr pubHdr; + struct cca_public_sec pubSec; + char exponent[0]; + } __packed *key = p; + unsigned char *temp; + int i; + + /* + * The inputdatalength was a selection criteria in the dispatching + * function zcrypt_rsa_modexpo(). However, do a plausibility check + * here to make sure the following copy_from_user() can't be utilized + * to compromise the system. + */ + if (WARN_ON_ONCE(mex->inputdatalength > 512)) + return -EINVAL; + + memset(key, 0, sizeof(*key)); + + key->pubHdr = static_pub_hdr; + key->pubSec = static_pub_sec; + + /* key parameter block */ + temp = key->exponent; + if (copy_from_user(temp, mex->b_key, mex->inputdatalength)) + return -EFAULT; + /* Strip leading zeroes from b_key. */ + for (i = 0; i < mex->inputdatalength; i++) + if (temp[i]) + break; + if (i >= mex->inputdatalength) + return -EINVAL; + memmove(temp, temp + i, mex->inputdatalength - i); + temp += mex->inputdatalength - i; + /* modulus */ + if (copy_from_user(temp, mex->n_modulus, mex->inputdatalength)) + return -EFAULT; + + key->pubSec.modulus_bit_len = 8 * mex->inputdatalength; + key->pubSec.modulus_byte_len = mex->inputdatalength; + key->pubSec.exponent_len = mex->inputdatalength - i; + key->pubSec.section_length = sizeof(key->pubSec) + + 2*mex->inputdatalength - i; + key->pubHdr.token_length = + key->pubSec.section_length + sizeof(key->pubHdr); + key->t6_hdr.ulen = key->pubHdr.token_length + 4; + key->t6_hdr.blen = key->pubHdr.token_length + 6; + return sizeof(*key) + 2*mex->inputdatalength - i; +} + +/** + * Set up private key fields of a type6 CRT message. + * Note that all numerics in the key token are big-endian, + * while the entries in the key block header are little-endian. + * + * @mex: pointer to user input data + * @p: pointer to memory area for the key + * + * Returns the size of the key area or -EFAULT + */ +static inline int zcrypt_type6_crt_key(struct ica_rsa_modexpo_crt *crt, void *p) +{ + static struct cca_public_sec static_cca_pub_sec = { + .section_identifier = 4, + .section_length = 0x000f, + .exponent_len = 0x0003, + }; + static char pk_exponent[3] = { 0x01, 0x00, 0x01 }; + struct { + struct T6_keyBlock_hdr t6_hdr; + struct cca_token_hdr token; + struct cca_pvt_ext_CRT_sec pvt; + char key_parts[0]; + } __packed *key = p; + struct cca_public_sec *pub; + int short_len, long_len, pad_len, key_len, size; + + /* + * The inputdatalength was a selection criteria in the dispatching + * function zcrypt_rsa_crt(). However, do a plausibility check + * here to make sure the following copy_from_user() can't be utilized + * to compromise the system. + */ + if (WARN_ON_ONCE(crt->inputdatalength > 512)) + return -EINVAL; + + memset(key, 0, sizeof(*key)); + + short_len = (crt->inputdatalength + 1) / 2; + long_len = short_len + 8; + pad_len = -(3*long_len + 2*short_len) & 7; + key_len = 3*long_len + 2*short_len + pad_len + crt->inputdatalength; + size = sizeof(*key) + key_len + sizeof(*pub) + 3; + + /* parameter block.key block */ + key->t6_hdr.blen = size; + key->t6_hdr.ulen = size - 2; + + /* key token header */ + key->token.token_identifier = CCA_TKN_HDR_ID_EXT; + key->token.token_length = size - 6; + + /* private section */ + key->pvt.section_identifier = CCA_PVT_EXT_CRT_SEC_ID_PVT; + key->pvt.section_length = sizeof(key->pvt) + key_len; + key->pvt.key_format = CCA_PVT_EXT_CRT_SEC_FMT_CL; + key->pvt.key_use_flags[0] = CCA_PVT_USAGE_ALL; + key->pvt.p_len = key->pvt.dp_len = key->pvt.u_len = long_len; + key->pvt.q_len = key->pvt.dq_len = short_len; + key->pvt.mod_len = crt->inputdatalength; + key->pvt.pad_len = pad_len; + + /* key parts */ + if (copy_from_user(key->key_parts, crt->np_prime, long_len) || + copy_from_user(key->key_parts + long_len, + crt->nq_prime, short_len) || + copy_from_user(key->key_parts + long_len + short_len, + crt->bp_key, long_len) || + copy_from_user(key->key_parts + 2*long_len + short_len, + crt->bq_key, short_len) || + copy_from_user(key->key_parts + 2*long_len + 2*short_len, + crt->u_mult_inv, long_len)) + return -EFAULT; + memset(key->key_parts + 3*long_len + 2*short_len + pad_len, + 0xff, crt->inputdatalength); + pub = (struct cca_public_sec *)(key->key_parts + key_len); + *pub = static_cca_pub_sec; + pub->modulus_bit_len = 8 * crt->inputdatalength; + /* + * In a private key, the modulus doesn't appear in the public + * section. So, an arbitrary public exponent of 0x010001 will be + * used. + */ + memcpy((char *) (pub + 1), pk_exponent, 3); + return size; +} + +#endif /* _ZCRYPT_CCA_KEY_H_ */ diff --git a/drivers/s390/crypto/zcrypt_cex2a.c b/drivers/s390/crypto/zcrypt_cex2a.c new file mode 100644 index 000000000..ff17a0027 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_cex2a.c @@ -0,0 +1,238 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * Ralph Wuerthner + * MSGTYPE restruct: Holger Dengler + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "ap_bus.h" +#include "zcrypt_api.h" +#include "zcrypt_error.h" +#include "zcrypt_cex2a.h" +#include "zcrypt_msgtype50.h" + +#define CEX2A_MIN_MOD_SIZE 1 /* 8 bits */ +#define CEX2A_MAX_MOD_SIZE 256 /* 2048 bits */ +#define CEX3A_MIN_MOD_SIZE CEX2A_MIN_MOD_SIZE +#define CEX3A_MAX_MOD_SIZE 512 /* 4096 bits */ + +#define CEX2A_MAX_MESSAGE_SIZE 0x390 /* sizeof(struct type50_crb2_msg) */ +#define CEX2A_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */ + +#define CEX3A_MAX_RESPONSE_SIZE 0x210 /* 512 bit modulus + * (max outputdatalength) + + * type80_hdr*/ +#define CEX3A_MAX_MESSAGE_SIZE sizeof(struct type50_crb3_msg) + +#define CEX2A_CLEANUP_TIME (15*HZ) +#define CEX3A_CLEANUP_TIME CEX2A_CLEANUP_TIME + +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("CEX2A Cryptographic Coprocessor device driver, " \ + "Copyright IBM Corp. 2001, 2012"); +MODULE_LICENSE("GPL"); + +static struct ap_device_id zcrypt_cex2a_card_ids[] = { + { .dev_type = AP_DEVICE_TYPE_CEX2A, + .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX3A, + .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_card_ids); + +static struct ap_device_id zcrypt_cex2a_queue_ids[] = { + { .dev_type = AP_DEVICE_TYPE_CEX2A, + .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX3A, + .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_queue_ids); + +/** + * Probe function for CEX2A card devices. It always accepts the AP device + * since the bus_match already checked the card type. + * @ap_dev: pointer to the AP device. + */ +static int zcrypt_cex2a_card_probe(struct ap_device *ap_dev) +{ + /* + * Normalized speed ratings per crypto adapter + * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY + */ + static const int CEX2A_SPEED_IDX[] = { + 800, 1000, 2000, 900, 1200, 2400, 0, 0}; + static const int CEX3A_SPEED_IDX[] = { + 400, 500, 1000, 450, 550, 1200, 0, 0}; + + struct ap_card *ac = to_ap_card(&ap_dev->device); + struct zcrypt_card *zc; + int rc = 0; + + zc = zcrypt_card_alloc(); + if (!zc) + return -ENOMEM; + zc->card = ac; + ac->private = zc; + + if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A) { + zc->min_mod_size = CEX2A_MIN_MOD_SIZE; + zc->max_mod_size = CEX2A_MAX_MOD_SIZE; + memcpy(zc->speed_rating, CEX2A_SPEED_IDX, + sizeof(CEX2A_SPEED_IDX)); + zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE; + zc->type_string = "CEX2A"; + zc->user_space_type = ZCRYPT_CEX2A; + } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX3A) { + zc->min_mod_size = CEX2A_MIN_MOD_SIZE; + zc->max_mod_size = CEX2A_MAX_MOD_SIZE; + zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE; + if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) && + ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) { + zc->max_mod_size = CEX3A_MAX_MOD_SIZE; + zc->max_exp_bit_length = CEX3A_MAX_MOD_SIZE; + } + memcpy(zc->speed_rating, CEX3A_SPEED_IDX, + sizeof(CEX3A_SPEED_IDX)); + zc->type_string = "CEX3A"; + zc->user_space_type = ZCRYPT_CEX3A; + } else { + zcrypt_card_free(zc); + return -ENODEV; + } + zc->online = 1; + + rc = zcrypt_card_register(zc); + if (rc) { + ac->private = NULL; + zcrypt_card_free(zc); + } + + return rc; +} + +/** + * This is called to remove the CEX2A card driver information + * if an AP card device is removed. + */ +static void zcrypt_cex2a_card_remove(struct ap_device *ap_dev) +{ + struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private; + + if (zc) + zcrypt_card_unregister(zc); +} + +static struct ap_driver zcrypt_cex2a_card_driver = { + .probe = zcrypt_cex2a_card_probe, + .remove = zcrypt_cex2a_card_remove, + .ids = zcrypt_cex2a_card_ids, + .flags = AP_DRIVER_FLAG_DEFAULT, +}; + +/** + * Probe function for CEX2A queue devices. It always accepts the AP device + * since the bus_match already checked the queue type. + * @ap_dev: pointer to the AP device. + */ +static int zcrypt_cex2a_queue_probe(struct ap_device *ap_dev) +{ + struct ap_queue *aq = to_ap_queue(&ap_dev->device); + struct zcrypt_queue *zq = NULL; + int rc; + + switch (ap_dev->device_type) { + case AP_DEVICE_TYPE_CEX2A: + zq = zcrypt_queue_alloc(CEX2A_MAX_RESPONSE_SIZE); + if (!zq) + return -ENOMEM; + break; + case AP_DEVICE_TYPE_CEX3A: + zq = zcrypt_queue_alloc(CEX3A_MAX_RESPONSE_SIZE); + if (!zq) + return -ENOMEM; + break; + } + if (!zq) + return -ENODEV; + zq->ops = zcrypt_msgtype(MSGTYPE50_NAME, MSGTYPE50_VARIANT_DEFAULT); + zq->queue = aq; + zq->online = 1; + atomic_set(&zq->load, 0); + ap_queue_init_reply(aq, &zq->reply); + aq->request_timeout = CEX2A_CLEANUP_TIME, + aq->private = zq; + rc = zcrypt_queue_register(zq); + if (rc) { + aq->private = NULL; + zcrypt_queue_free(zq); + } + + return rc; +} + +/** + * This is called to remove the CEX2A queue driver information + * if an AP queue device is removed. + */ +static void zcrypt_cex2a_queue_remove(struct ap_device *ap_dev) +{ + struct ap_queue *aq = to_ap_queue(&ap_dev->device); + struct zcrypt_queue *zq = aq->private; + + if (zq) + zcrypt_queue_unregister(zq); +} + +static struct ap_driver zcrypt_cex2a_queue_driver = { + .probe = zcrypt_cex2a_queue_probe, + .remove = zcrypt_cex2a_queue_remove, + .suspend = ap_queue_suspend, + .resume = ap_queue_resume, + .ids = zcrypt_cex2a_queue_ids, + .flags = AP_DRIVER_FLAG_DEFAULT, +}; + +int __init zcrypt_cex2a_init(void) +{ + int rc; + + rc = ap_driver_register(&zcrypt_cex2a_card_driver, + THIS_MODULE, "cex2acard"); + if (rc) + return rc; + + rc = ap_driver_register(&zcrypt_cex2a_queue_driver, + THIS_MODULE, "cex2aqueue"); + if (rc) + ap_driver_unregister(&zcrypt_cex2a_card_driver); + + return rc; +} + +void __exit zcrypt_cex2a_exit(void) +{ + ap_driver_unregister(&zcrypt_cex2a_queue_driver); + ap_driver_unregister(&zcrypt_cex2a_card_driver); +} + +module_init(zcrypt_cex2a_init); +module_exit(zcrypt_cex2a_exit); diff --git a/drivers/s390/crypto/zcrypt_cex2a.h b/drivers/s390/crypto/zcrypt_cex2a.h new file mode 100644 index 000000000..66d58bc87 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_cex2a.h @@ -0,0 +1,136 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2006 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + */ + +#ifndef _ZCRYPT_CEX2A_H_ +#define _ZCRYPT_CEX2A_H_ + +/** + * The type 50 message family is associated with a CEX2A card. + * + * The four members of the family are described below. + * + * Note that all unsigned char arrays are right-justified and left-padded + * with zeroes. + * + * Note that all reserved fields must be zeroes. + */ +struct type50_hdr { + unsigned char reserved1; + unsigned char msg_type_code; /* 0x50 */ + unsigned short msg_len; + unsigned char reserved2; + unsigned char ignored; + unsigned short reserved3; +} __packed; + +#define TYPE50_TYPE_CODE 0x50 + +#define TYPE50_MEB1_FMT 0x0001 +#define TYPE50_MEB2_FMT 0x0002 +#define TYPE50_MEB3_FMT 0x0003 +#define TYPE50_CRB1_FMT 0x0011 +#define TYPE50_CRB2_FMT 0x0012 +#define TYPE50_CRB3_FMT 0x0013 + +/* Mod-Exp, with a small modulus */ +struct type50_meb1_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0001 */ + unsigned char reserved[6]; + unsigned char exponent[128]; + unsigned char modulus[128]; + unsigned char message[128]; +} __packed; + +/* Mod-Exp, with a large modulus */ +struct type50_meb2_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0002 */ + unsigned char reserved[6]; + unsigned char exponent[256]; + unsigned char modulus[256]; + unsigned char message[256]; +} __packed; + +/* Mod-Exp, with a larger modulus */ +struct type50_meb3_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0003 */ + unsigned char reserved[6]; + unsigned char exponent[512]; + unsigned char modulus[512]; + unsigned char message[512]; +} __packed; + +/* CRT, with a small modulus */ +struct type50_crb1_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0011 */ + unsigned char reserved[6]; + unsigned char p[64]; + unsigned char q[64]; + unsigned char dp[64]; + unsigned char dq[64]; + unsigned char u[64]; + unsigned char message[128]; +} __packed; + +/* CRT, with a large modulus */ +struct type50_crb2_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0012 */ + unsigned char reserved[6]; + unsigned char p[128]; + unsigned char q[128]; + unsigned char dp[128]; + unsigned char dq[128]; + unsigned char u[128]; + unsigned char message[256]; +} __packed; + +/* CRT, with a larger modulus */ +struct type50_crb3_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0013 */ + unsigned char reserved[6]; + unsigned char p[256]; + unsigned char q[256]; + unsigned char dp[256]; + unsigned char dq[256]; + unsigned char u[256]; + unsigned char message[512]; +} __packed; + +/** + * The type 80 response family is associated with a CEX2A card. + * + * Note that all unsigned char arrays are right-justified and left-padded + * with zeroes. + * + * Note that all reserved fields must be zeroes. + */ + +#define TYPE80_RSP_CODE 0x80 + +struct type80_hdr { + unsigned char reserved1; + unsigned char type; /* 0x80 */ + unsigned short len; + unsigned char code; /* 0x00 */ + unsigned char reserved2[3]; + unsigned char reserved3[8]; +} __packed; + +int zcrypt_cex2a_init(void); +void zcrypt_cex2a_exit(void); + +#endif /* _ZCRYPT_CEX2A_H_ */ diff --git a/drivers/s390/crypto/zcrypt_cex4.c b/drivers/s390/crypto/zcrypt_cex4.c new file mode 100644 index 000000000..2a42e5962 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_cex4.c @@ -0,0 +1,313 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2012 + * Author(s): Holger Dengler + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "ap_bus.h" +#include "zcrypt_api.h" +#include "zcrypt_msgtype6.h" +#include "zcrypt_msgtype50.h" +#include "zcrypt_error.h" +#include "zcrypt_cex4.h" + +#define CEX4A_MIN_MOD_SIZE 1 /* 8 bits */ +#define CEX4A_MAX_MOD_SIZE_2K 256 /* 2048 bits */ +#define CEX4A_MAX_MOD_SIZE_4K 512 /* 4096 bits */ + +#define CEX4C_MIN_MOD_SIZE 16 /* 256 bits */ +#define CEX4C_MAX_MOD_SIZE 512 /* 4096 bits */ + +#define CEX4A_MAX_MESSAGE_SIZE MSGTYPE50_CRB3_MAX_MSG_SIZE +#define CEX4C_MAX_MESSAGE_SIZE MSGTYPE06_MAX_MSG_SIZE + +/* Waiting time for requests to be processed. + * Currently there are some types of request which are not deterministic. + * But the maximum time limit managed by the stomper code is set to 60sec. + * Hence we have to wait at least that time period. + */ +#define CEX4_CLEANUP_TIME (900*HZ) + +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \ + "Copyright IBM Corp. 2012"); +MODULE_LICENSE("GPL"); + +static struct ap_device_id zcrypt_cex4_card_ids[] = { + { .dev_type = AP_DEVICE_TYPE_CEX4, + .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX5, + .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX6, + .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ap, zcrypt_cex4_card_ids); + +static struct ap_device_id zcrypt_cex4_queue_ids[] = { + { .dev_type = AP_DEVICE_TYPE_CEX4, + .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX5, + .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX6, + .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ap, zcrypt_cex4_queue_ids); + +/** + * Probe function for CEX4 card device. It always accepts the AP device + * since the bus_match already checked the hardware type. + * @ap_dev: pointer to the AP device. + */ +static int zcrypt_cex4_card_probe(struct ap_device *ap_dev) +{ + /* + * Normalized speed ratings per crypto adapter + * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY + */ + static const int CEX4A_SPEED_IDX[] = { + 14, 19, 249, 42, 228, 1458, 0, 0}; + static const int CEX5A_SPEED_IDX[] = { + 8, 9, 20, 18, 66, 458, 0, 0}; + static const int CEX6A_SPEED_IDX[] = { + 6, 9, 20, 17, 65, 438, 0, 0}; + + static const int CEX4C_SPEED_IDX[] = { + 59, 69, 308, 83, 278, 2204, 209, 40}; + static const int CEX5C_SPEED_IDX[] = { + 24, 31, 50, 37, 90, 479, 27, 10}; + static const int CEX6C_SPEED_IDX[] = { + 16, 20, 32, 27, 77, 455, 23, 9}; + + static const int CEX4P_SPEED_IDX[] = { + 224, 313, 3560, 359, 605, 2827, 0, 50}; + static const int CEX5P_SPEED_IDX[] = { + 63, 84, 156, 83, 142, 533, 0, 10}; + static const int CEX6P_SPEED_IDX[] = { + 55, 70, 121, 73, 129, 522, 0, 9}; + + struct ap_card *ac = to_ap_card(&ap_dev->device); + struct zcrypt_card *zc; + int rc = 0; + + zc = zcrypt_card_alloc(); + if (!zc) + return -ENOMEM; + zc->card = ac; + ac->private = zc; + if (ap_test_bit(&ac->functions, AP_FUNC_ACCEL)) { + if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) { + zc->type_string = "CEX4A"; + zc->user_space_type = ZCRYPT_CEX4; + memcpy(zc->speed_rating, CEX4A_SPEED_IDX, + sizeof(CEX4A_SPEED_IDX)); + } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) { + zc->type_string = "CEX5A"; + zc->user_space_type = ZCRYPT_CEX5; + memcpy(zc->speed_rating, CEX5A_SPEED_IDX, + sizeof(CEX5A_SPEED_IDX)); + } else { + zc->type_string = "CEX6A"; + zc->user_space_type = ZCRYPT_CEX6; + memcpy(zc->speed_rating, CEX6A_SPEED_IDX, + sizeof(CEX6A_SPEED_IDX)); + } + zc->min_mod_size = CEX4A_MIN_MOD_SIZE; + if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) && + ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) { + zc->max_mod_size = CEX4A_MAX_MOD_SIZE_4K; + zc->max_exp_bit_length = + CEX4A_MAX_MOD_SIZE_4K; + } else { + zc->max_mod_size = CEX4A_MAX_MOD_SIZE_2K; + zc->max_exp_bit_length = + CEX4A_MAX_MOD_SIZE_2K; + } + } else if (ap_test_bit(&ac->functions, AP_FUNC_COPRO)) { + if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) { + zc->type_string = "CEX4C"; + /* wrong user space type, must be CEX4 + * just keep it for cca compatibility + */ + zc->user_space_type = ZCRYPT_CEX3C; + memcpy(zc->speed_rating, CEX4C_SPEED_IDX, + sizeof(CEX4C_SPEED_IDX)); + } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) { + zc->type_string = "CEX5C"; + /* wrong user space type, must be CEX5 + * just keep it for cca compatibility + */ + zc->user_space_type = ZCRYPT_CEX3C; + memcpy(zc->speed_rating, CEX5C_SPEED_IDX, + sizeof(CEX5C_SPEED_IDX)); + } else { + zc->type_string = "CEX6C"; + /* wrong user space type, must be CEX6 + * just keep it for cca compatibility + */ + zc->user_space_type = ZCRYPT_CEX3C; + memcpy(zc->speed_rating, CEX6C_SPEED_IDX, + sizeof(CEX6C_SPEED_IDX)); + } + zc->min_mod_size = CEX4C_MIN_MOD_SIZE; + zc->max_mod_size = CEX4C_MAX_MOD_SIZE; + zc->max_exp_bit_length = CEX4C_MAX_MOD_SIZE; + } else if (ap_test_bit(&ac->functions, AP_FUNC_EP11)) { + if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) { + zc->type_string = "CEX4P"; + zc->user_space_type = ZCRYPT_CEX4; + memcpy(zc->speed_rating, CEX4P_SPEED_IDX, + sizeof(CEX4P_SPEED_IDX)); + } else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) { + zc->type_string = "CEX5P"; + zc->user_space_type = ZCRYPT_CEX5; + memcpy(zc->speed_rating, CEX5P_SPEED_IDX, + sizeof(CEX5P_SPEED_IDX)); + } else { + zc->type_string = "CEX6P"; + zc->user_space_type = ZCRYPT_CEX6; + memcpy(zc->speed_rating, CEX6P_SPEED_IDX, + sizeof(CEX6P_SPEED_IDX)); + } + zc->min_mod_size = CEX4C_MIN_MOD_SIZE; + zc->max_mod_size = CEX4C_MAX_MOD_SIZE; + zc->max_exp_bit_length = CEX4C_MAX_MOD_SIZE; + } else { + zcrypt_card_free(zc); + return -ENODEV; + } + zc->online = 1; + + rc = zcrypt_card_register(zc); + if (rc) { + ac->private = NULL; + zcrypt_card_free(zc); + } + + return rc; +} + +/** + * This is called to remove the CEX4 card driver information + * if an AP card device is removed. + */ +static void zcrypt_cex4_card_remove(struct ap_device *ap_dev) +{ + struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private; + + if (zc) + zcrypt_card_unregister(zc); +} + +static struct ap_driver zcrypt_cex4_card_driver = { + .probe = zcrypt_cex4_card_probe, + .remove = zcrypt_cex4_card_remove, + .ids = zcrypt_cex4_card_ids, + .flags = AP_DRIVER_FLAG_DEFAULT, +}; + +/** + * Probe function for CEX4 queue device. It always accepts the AP device + * since the bus_match already checked the hardware type. + * @ap_dev: pointer to the AP device. + */ +static int zcrypt_cex4_queue_probe(struct ap_device *ap_dev) +{ + struct ap_queue *aq = to_ap_queue(&ap_dev->device); + struct zcrypt_queue *zq; + int rc; + + if (ap_test_bit(&aq->card->functions, AP_FUNC_ACCEL)) { + zq = zcrypt_queue_alloc(CEX4A_MAX_MESSAGE_SIZE); + if (!zq) + return -ENOMEM; + zq->ops = zcrypt_msgtype(MSGTYPE50_NAME, + MSGTYPE50_VARIANT_DEFAULT); + } else if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO)) { + zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE); + if (!zq) + return -ENOMEM; + zq->ops = zcrypt_msgtype(MSGTYPE06_NAME, + MSGTYPE06_VARIANT_DEFAULT); + } else if (ap_test_bit(&aq->card->functions, AP_FUNC_EP11)) { + zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE); + if (!zq) + return -ENOMEM; + zq->ops = zcrypt_msgtype(MSGTYPE06_NAME, + MSGTYPE06_VARIANT_EP11); + } else { + return -ENODEV; + } + zq->queue = aq; + zq->online = 1; + atomic_set(&zq->load, 0); + ap_queue_init_reply(aq, &zq->reply); + aq->request_timeout = CEX4_CLEANUP_TIME, + aq->private = zq; + rc = zcrypt_queue_register(zq); + if (rc) { + aq->private = NULL; + zcrypt_queue_free(zq); + } + + return rc; +} + +/** + * This is called to remove the CEX4 queue driver information + * if an AP queue device is removed. + */ +static void zcrypt_cex4_queue_remove(struct ap_device *ap_dev) +{ + struct ap_queue *aq = to_ap_queue(&ap_dev->device); + struct zcrypt_queue *zq = aq->private; + + if (zq) + zcrypt_queue_unregister(zq); +} + +static struct ap_driver zcrypt_cex4_queue_driver = { + .probe = zcrypt_cex4_queue_probe, + .remove = zcrypt_cex4_queue_remove, + .suspend = ap_queue_suspend, + .resume = ap_queue_resume, + .ids = zcrypt_cex4_queue_ids, + .flags = AP_DRIVER_FLAG_DEFAULT, +}; + +int __init zcrypt_cex4_init(void) +{ + int rc; + + rc = ap_driver_register(&zcrypt_cex4_card_driver, + THIS_MODULE, "cex4card"); + if (rc) + return rc; + + rc = ap_driver_register(&zcrypt_cex4_queue_driver, + THIS_MODULE, "cex4queue"); + if (rc) + ap_driver_unregister(&zcrypt_cex4_card_driver); + + return rc; +} + +void __exit zcrypt_cex4_exit(void) +{ + ap_driver_unregister(&zcrypt_cex4_queue_driver); + ap_driver_unregister(&zcrypt_cex4_card_driver); +} + +module_init(zcrypt_cex4_init); +module_exit(zcrypt_cex4_exit); diff --git a/drivers/s390/crypto/zcrypt_cex4.h b/drivers/s390/crypto/zcrypt_cex4.h new file mode 100644 index 000000000..748390a37 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_cex4.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2012 + * Author(s): Holger Dengler + */ + +#ifndef _ZCRYPT_CEX4_H_ +#define _ZCRYPT_CEX4_H_ + +int zcrypt_cex4_init(void); +void zcrypt_cex4_exit(void); + +#endif /* _ZCRYPT_CEX4_H_ */ diff --git a/drivers/s390/crypto/zcrypt_debug.h b/drivers/s390/crypto/zcrypt_debug.h new file mode 100644 index 000000000..241dbb5f7 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_debug.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2016 + * Author(s): Holger Dengler (hd@linux.vnet.ibm.com) + * Harald Freudenberger + */ +#ifndef ZCRYPT_DEBUG_H +#define ZCRYPT_DEBUG_H + +#include + +#define DBF_ERR 3 /* error conditions */ +#define DBF_WARN 4 /* warning conditions */ +#define DBF_INFO 5 /* informational */ +#define DBF_DEBUG 6 /* for debugging only */ + +#define RC2ERR(rc) ((rc) ? DBF_ERR : DBF_INFO) +#define RC2WARN(rc) ((rc) ? DBF_WARN : DBF_INFO) + +#define DBF_MAX_SPRINTF_ARGS 5 + +#define ZCRYPT_DBF(...) \ + debug_sprintf_event(zcrypt_dbf_info, ##__VA_ARGS__) + +extern debug_info_t *zcrypt_dbf_info; + +int zcrypt_debug_init(void); +void zcrypt_debug_exit(void); + +#endif /* ZCRYPT_DEBUG_H */ diff --git a/drivers/s390/crypto/zcrypt_error.h b/drivers/s390/crypto/zcrypt_error.h new file mode 100644 index 000000000..2126f4cc6 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_error.h @@ -0,0 +1,143 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2006 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + */ + +#ifndef _ZCRYPT_ERROR_H_ +#define _ZCRYPT_ERROR_H_ + +#include +#include "zcrypt_debug.h" +#include "zcrypt_api.h" + +/** + * Reply Messages + * + * Error reply messages are of two types: + * 82: Error (see below) + * 88: Error (see below) + * Both type 82 and type 88 have the same structure in the header. + * + * Request reply messages are of three known types: + * 80: Reply from a Type 50 Request (see CEX2A-RELATED STRUCTS) + * 84: Reply from a Type 4 Request (see PCICA-RELATED STRUCTS) + * 86: Reply from a Type 6 Request (see PCICC/PCIXCC/CEX2C-RELATED STRUCTS) + * + */ +struct error_hdr { + unsigned char reserved1; /* 0x00 */ + unsigned char type; /* 0x82 or 0x88 */ + unsigned char reserved2[2]; /* 0x0000 */ + unsigned char reply_code; /* reply code */ + unsigned char reserved3[3]; /* 0x000000 */ +}; + +#define TYPE82_RSP_CODE 0x82 +#define TYPE88_RSP_CODE 0x88 + +#define REP82_ERROR_MACHINE_FAILURE 0x10 +#define REP82_ERROR_PREEMPT_FAILURE 0x12 +#define REP82_ERROR_CHECKPT_FAILURE 0x14 +#define REP82_ERROR_MESSAGE_TYPE 0x20 +#define REP82_ERROR_INVALID_COMM_CD 0x21 /* Type 84 */ +#define REP82_ERROR_INVALID_MSG_LEN 0x23 +#define REP82_ERROR_RESERVD_FIELD 0x24 /* was 0x50 */ +#define REP82_ERROR_FORMAT_FIELD 0x29 +#define REP82_ERROR_INVALID_COMMAND 0x30 +#define REP82_ERROR_MALFORMED_MSG 0x40 +#define REP82_ERROR_INVALID_SPECIAL_CMD 0x41 +#define REP82_ERROR_INVALID_DOMAIN_PRECHECK 0x42 +#define REP82_ERROR_RESERVED_FIELDO 0x50 /* old value */ +#define REP82_ERROR_WORD_ALIGNMENT 0x60 +#define REP82_ERROR_MESSAGE_LENGTH 0x80 +#define REP82_ERROR_OPERAND_INVALID 0x82 +#define REP82_ERROR_OPERAND_SIZE 0x84 +#define REP82_ERROR_EVEN_MOD_IN_OPND 0x85 +#define REP82_ERROR_RESERVED_FIELD 0x88 +#define REP82_ERROR_INVALID_DOMAIN_PENDING 0x8A +#define REP82_ERROR_FILTERED_BY_HYPERVISOR 0x8B +#define REP82_ERROR_TRANSPORT_FAIL 0x90 +#define REP82_ERROR_PACKET_TRUNCATED 0xA0 +#define REP82_ERROR_ZERO_BUFFER_LEN 0xB0 + +#define REP88_ERROR_MODULE_FAILURE 0x10 + +#define REP88_ERROR_MESSAGE_TYPE 0x20 +#define REP88_ERROR_MESSAGE_MALFORMD 0x22 +#define REP88_ERROR_MESSAGE_LENGTH 0x23 +#define REP88_ERROR_RESERVED_FIELD 0x24 +#define REP88_ERROR_KEY_TYPE 0x34 +#define REP88_ERROR_INVALID_KEY 0x82 /* CEX2A */ +#define REP88_ERROR_OPERAND 0x84 /* CEX2A */ +#define REP88_ERROR_OPERAND_EVEN_MOD 0x85 /* CEX2A */ + +static inline int convert_error(struct zcrypt_queue *zq, + struct ap_message *reply) +{ + struct error_hdr *ehdr = reply->message; + int card = AP_QID_CARD(zq->queue->qid); + int queue = AP_QID_QUEUE(zq->queue->qid); + + switch (ehdr->reply_code) { + case REP82_ERROR_OPERAND_INVALID: + case REP82_ERROR_OPERAND_SIZE: + case REP82_ERROR_EVEN_MOD_IN_OPND: + case REP88_ERROR_MESSAGE_MALFORMD: + case REP82_ERROR_INVALID_DOMAIN_PRECHECK: + case REP82_ERROR_INVALID_DOMAIN_PENDING: + case REP82_ERROR_INVALID_SPECIAL_CMD: + case REP82_ERROR_FILTERED_BY_HYPERVISOR: + // REP88_ERROR_INVALID_KEY // '82' CEX2A + // REP88_ERROR_OPERAND // '84' CEX2A + // REP88_ERROR_OPERAND_EVEN_MOD // '85' CEX2A + /* Invalid input data. */ + ZCRYPT_DBF(DBF_WARN, + "device=%02x.%04x reply=0x%02x => rc=EINVAL\n", + card, queue, ehdr->reply_code); + return -EINVAL; + case REP82_ERROR_MESSAGE_TYPE: + // REP88_ERROR_MESSAGE_TYPE // '20' CEX2A + /* + * To sent a message of the wrong type is a bug in the + * device driver. Send error msg, disable the device + * and then repeat the request. + */ + atomic_set(&zcrypt_rescan_req, 1); + zq->online = 0; + pr_err("Cryptographic device %02x.%04x failed and was set offline\n", + card, queue); + ZCRYPT_DBF(DBF_ERR, + "device=%02x.%04x reply=0x%02x => online=0 rc=EAGAIN\n", + card, queue, ehdr->reply_code); + return -EAGAIN; + case REP82_ERROR_TRANSPORT_FAIL: + case REP82_ERROR_MACHINE_FAILURE: + // REP88_ERROR_MODULE_FAILURE // '10' CEX2A + /* If a card fails disable it and repeat the request. */ + atomic_set(&zcrypt_rescan_req, 1); + zq->online = 0; + pr_err("Cryptographic device %02x.%04x failed and was set offline\n", + card, queue); + ZCRYPT_DBF(DBF_ERR, + "device=%02x.%04x reply=0x%02x => online=0 rc=EAGAIN\n", + card, queue, ehdr->reply_code); + return -EAGAIN; + default: + zq->online = 0; + pr_err("Cryptographic device %02x.%04x failed and was set offline\n", + card, queue); + ZCRYPT_DBF(DBF_ERR, + "device=%02x.%04x reply=0x%02x => online=0 rc=EAGAIN\n", + card, queue, ehdr->reply_code); + return -EAGAIN; /* repeat the request on a different device. */ + } +} + +#endif /* _ZCRYPT_ERROR_H_ */ diff --git a/drivers/s390/crypto/zcrypt_msgtype50.c b/drivers/s390/crypto/zcrypt_msgtype50.c new file mode 100644 index 000000000..f159662c9 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_msgtype50.c @@ -0,0 +1,560 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * Ralph Wuerthner + * MSGTYPE restruct: Holger Dengler + */ + +#define KMSG_COMPONENT "zcrypt" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include + +#include "ap_bus.h" +#include "zcrypt_api.h" +#include "zcrypt_error.h" +#include "zcrypt_msgtype50.h" + +/* 4096 bits */ +#define CEX3A_MAX_MOD_SIZE 512 + +/* max outputdatalength + type80_hdr */ +#define CEX2A_MAX_RESPONSE_SIZE 0x110 + +/* 512 bit modulus, (max outputdatalength) + type80_hdr */ +#define CEX3A_MAX_RESPONSE_SIZE 0x210 + +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("Cryptographic Accelerator (message type 50), " \ + "Copyright IBM Corp. 2001, 2012"); +MODULE_LICENSE("GPL"); + +/** + * The type 50 message family is associated with a CEX2A card. + * + * The four members of the family are described below. + * + * Note that all unsigned char arrays are right-justified and left-padded + * with zeroes. + * + * Note that all reserved fields must be zeroes. + */ +struct type50_hdr { + unsigned char reserved1; + unsigned char msg_type_code; /* 0x50 */ + unsigned short msg_len; + unsigned char reserved2; + unsigned char ignored; + unsigned short reserved3; +} __packed; + +#define TYPE50_TYPE_CODE 0x50 + +#define TYPE50_MEB1_FMT 0x0001 +#define TYPE50_MEB2_FMT 0x0002 +#define TYPE50_MEB3_FMT 0x0003 +#define TYPE50_CRB1_FMT 0x0011 +#define TYPE50_CRB2_FMT 0x0012 +#define TYPE50_CRB3_FMT 0x0013 + +/* Mod-Exp, with a small modulus */ +struct type50_meb1_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0001 */ + unsigned char reserved[6]; + unsigned char exponent[128]; + unsigned char modulus[128]; + unsigned char message[128]; +} __packed; + +/* Mod-Exp, with a large modulus */ +struct type50_meb2_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0002 */ + unsigned char reserved[6]; + unsigned char exponent[256]; + unsigned char modulus[256]; + unsigned char message[256]; +} __packed; + +/* Mod-Exp, with a larger modulus */ +struct type50_meb3_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0003 */ + unsigned char reserved[6]; + unsigned char exponent[512]; + unsigned char modulus[512]; + unsigned char message[512]; +} __packed; + +/* CRT, with a small modulus */ +struct type50_crb1_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0011 */ + unsigned char reserved[6]; + unsigned char p[64]; + unsigned char q[64]; + unsigned char dp[64]; + unsigned char dq[64]; + unsigned char u[64]; + unsigned char message[128]; +} __packed; + +/* CRT, with a large modulus */ +struct type50_crb2_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0012 */ + unsigned char reserved[6]; + unsigned char p[128]; + unsigned char q[128]; + unsigned char dp[128]; + unsigned char dq[128]; + unsigned char u[128]; + unsigned char message[256]; +} __packed; + +/* CRT, with a larger modulus */ +struct type50_crb3_msg { + struct type50_hdr header; + unsigned short keyblock_type; /* 0x0013 */ + unsigned char reserved[6]; + unsigned char p[256]; + unsigned char q[256]; + unsigned char dp[256]; + unsigned char dq[256]; + unsigned char u[256]; + unsigned char message[512]; +} __packed; + +/** + * The type 80 response family is associated with a CEX2A card. + * + * Note that all unsigned char arrays are right-justified and left-padded + * with zeroes. + * + * Note that all reserved fields must be zeroes. + */ + +#define TYPE80_RSP_CODE 0x80 + +struct type80_hdr { + unsigned char reserved1; + unsigned char type; /* 0x80 */ + unsigned short len; + unsigned char code; /* 0x00 */ + unsigned char reserved2[3]; + unsigned char reserved3[8]; +} __packed; + +unsigned int get_rsa_modex_fc(struct ica_rsa_modexpo *mex, int *fcode) +{ + + if (!mex->inputdatalength) + return -EINVAL; + + if (mex->inputdatalength <= 128) /* 1024 bit */ + *fcode = MEX_1K; + else if (mex->inputdatalength <= 256) /* 2048 bit */ + *fcode = MEX_2K; + else /* 4096 bit */ + *fcode = MEX_4K; + + return 0; +} + +unsigned int get_rsa_crt_fc(struct ica_rsa_modexpo_crt *crt, int *fcode) +{ + + if (!crt->inputdatalength) + return -EINVAL; + + if (crt->inputdatalength <= 128) /* 1024 bit */ + *fcode = CRT_1K; + else if (crt->inputdatalength <= 256) /* 2048 bit */ + *fcode = CRT_2K; + else /* 4096 bit */ + *fcode = CRT_4K; + + return 0; +} + +/** + * Convert a ICAMEX message to a type50 MEX message. + * + * @zq: crypto queue pointer + * @ap_msg: crypto request pointer + * @mex: pointer to user input data + * + * Returns 0 on success or -EFAULT. + */ +static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_queue *zq, + struct ap_message *ap_msg, + struct ica_rsa_modexpo *mex) +{ + unsigned char *mod, *exp, *inp; + int mod_len; + + mod_len = mex->inputdatalength; + + if (mod_len <= 128) { + struct type50_meb1_msg *meb1 = ap_msg->message; + + memset(meb1, 0, sizeof(*meb1)); + ap_msg->length = sizeof(*meb1); + meb1->header.msg_type_code = TYPE50_TYPE_CODE; + meb1->header.msg_len = sizeof(*meb1); + meb1->keyblock_type = TYPE50_MEB1_FMT; + mod = meb1->modulus + sizeof(meb1->modulus) - mod_len; + exp = meb1->exponent + sizeof(meb1->exponent) - mod_len; + inp = meb1->message + sizeof(meb1->message) - mod_len; + } else if (mod_len <= 256) { + struct type50_meb2_msg *meb2 = ap_msg->message; + + memset(meb2, 0, sizeof(*meb2)); + ap_msg->length = sizeof(*meb2); + meb2->header.msg_type_code = TYPE50_TYPE_CODE; + meb2->header.msg_len = sizeof(*meb2); + meb2->keyblock_type = TYPE50_MEB2_FMT; + mod = meb2->modulus + sizeof(meb2->modulus) - mod_len; + exp = meb2->exponent + sizeof(meb2->exponent) - mod_len; + inp = meb2->message + sizeof(meb2->message) - mod_len; + } else if (mod_len <= 512) { + struct type50_meb3_msg *meb3 = ap_msg->message; + + memset(meb3, 0, sizeof(*meb3)); + ap_msg->length = sizeof(*meb3); + meb3->header.msg_type_code = TYPE50_TYPE_CODE; + meb3->header.msg_len = sizeof(*meb3); + meb3->keyblock_type = TYPE50_MEB3_FMT; + mod = meb3->modulus + sizeof(meb3->modulus) - mod_len; + exp = meb3->exponent + sizeof(meb3->exponent) - mod_len; + inp = meb3->message + sizeof(meb3->message) - mod_len; + } else + return -EINVAL; + + if (copy_from_user(mod, mex->n_modulus, mod_len) || + copy_from_user(exp, mex->b_key, mod_len) || + copy_from_user(inp, mex->inputdata, mod_len)) + return -EFAULT; + return 0; +} + +/** + * Convert a ICACRT message to a type50 CRT message. + * + * @zq: crypto queue pointer + * @ap_msg: crypto request pointer + * @crt: pointer to user input data + * + * Returns 0 on success or -EFAULT. + */ +static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_queue *zq, + struct ap_message *ap_msg, + struct ica_rsa_modexpo_crt *crt) +{ + int mod_len, short_len; + unsigned char *p, *q, *dp, *dq, *u, *inp; + + mod_len = crt->inputdatalength; + short_len = (mod_len + 1) / 2; + + /* + * CEX2A and CEX3A w/o FW update can handle requests up to + * 256 byte modulus (2k keys). + * CEX3A with FW update and CEX4A cards are able to handle + * 512 byte modulus (4k keys). + */ + if (mod_len <= 128) { /* up to 1024 bit key size */ + struct type50_crb1_msg *crb1 = ap_msg->message; + + memset(crb1, 0, sizeof(*crb1)); + ap_msg->length = sizeof(*crb1); + crb1->header.msg_type_code = TYPE50_TYPE_CODE; + crb1->header.msg_len = sizeof(*crb1); + crb1->keyblock_type = TYPE50_CRB1_FMT; + p = crb1->p + sizeof(crb1->p) - short_len; + q = crb1->q + sizeof(crb1->q) - short_len; + dp = crb1->dp + sizeof(crb1->dp) - short_len; + dq = crb1->dq + sizeof(crb1->dq) - short_len; + u = crb1->u + sizeof(crb1->u) - short_len; + inp = crb1->message + sizeof(crb1->message) - mod_len; + } else if (mod_len <= 256) { /* up to 2048 bit key size */ + struct type50_crb2_msg *crb2 = ap_msg->message; + + memset(crb2, 0, sizeof(*crb2)); + ap_msg->length = sizeof(*crb2); + crb2->header.msg_type_code = TYPE50_TYPE_CODE; + crb2->header.msg_len = sizeof(*crb2); + crb2->keyblock_type = TYPE50_CRB2_FMT; + p = crb2->p + sizeof(crb2->p) - short_len; + q = crb2->q + sizeof(crb2->q) - short_len; + dp = crb2->dp + sizeof(crb2->dp) - short_len; + dq = crb2->dq + sizeof(crb2->dq) - short_len; + u = crb2->u + sizeof(crb2->u) - short_len; + inp = crb2->message + sizeof(crb2->message) - mod_len; + } else if ((mod_len <= 512) && /* up to 4096 bit key size */ + (zq->zcard->max_mod_size == CEX3A_MAX_MOD_SIZE)) { + struct type50_crb3_msg *crb3 = ap_msg->message; + + memset(crb3, 0, sizeof(*crb3)); + ap_msg->length = sizeof(*crb3); + crb3->header.msg_type_code = TYPE50_TYPE_CODE; + crb3->header.msg_len = sizeof(*crb3); + crb3->keyblock_type = TYPE50_CRB3_FMT; + p = crb3->p + sizeof(crb3->p) - short_len; + q = crb3->q + sizeof(crb3->q) - short_len; + dp = crb3->dp + sizeof(crb3->dp) - short_len; + dq = crb3->dq + sizeof(crb3->dq) - short_len; + u = crb3->u + sizeof(crb3->u) - short_len; + inp = crb3->message + sizeof(crb3->message) - mod_len; + } else + return -EINVAL; + + /* + * correct the offset of p, bp and mult_inv according zcrypt.h + * block size right aligned (skip the first byte) + */ + if (copy_from_user(p, crt->np_prime + MSGTYPE_ADJUSTMENT, short_len) || + copy_from_user(q, crt->nq_prime, short_len) || + copy_from_user(dp, crt->bp_key + MSGTYPE_ADJUSTMENT, short_len) || + copy_from_user(dq, crt->bq_key, short_len) || + copy_from_user(u, crt->u_mult_inv + MSGTYPE_ADJUSTMENT, short_len) || + copy_from_user(inp, crt->inputdata, mod_len)) + return -EFAULT; + + return 0; +} + +/** + * Copy results from a type 80 reply message back to user space. + * + * @zq: crypto device pointer + * @reply: reply AP message. + * @data: pointer to user output data + * @length: size of user output data + * + * Returns 0 on success or -EFAULT. + */ +static int convert_type80(struct zcrypt_queue *zq, + struct ap_message *reply, + char __user *outputdata, + unsigned int outputdatalength) +{ + struct type80_hdr *t80h = reply->message; + unsigned char *data; + + if (t80h->len < sizeof(*t80h) + outputdatalength) { + /* The result is too short, the CEX2A card may not do that.. */ + zq->online = 0; + pr_err("Cryptographic device %02x.%04x failed and was set offline\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid)); + ZCRYPT_DBF(DBF_ERR, + "device=%02x.%04x code=0x%02x => online=0 rc=EAGAIN\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + t80h->code); + return -EAGAIN; /* repeat the request on a different device. */ + } + if (zq->zcard->user_space_type == ZCRYPT_CEX2A) + BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE); + else + BUG_ON(t80h->len > CEX3A_MAX_RESPONSE_SIZE); + data = reply->message + t80h->len - outputdatalength; + if (copy_to_user(outputdata, data, outputdatalength)) + return -EFAULT; + return 0; +} + +static int convert_response(struct zcrypt_queue *zq, + struct ap_message *reply, + char __user *outputdata, + unsigned int outputdatalength) +{ + /* Response type byte is the second byte in the response. */ + unsigned char rtype = ((unsigned char *) reply->message)[1]; + + switch (rtype) { + case TYPE82_RSP_CODE: + case TYPE88_RSP_CODE: + return convert_error(zq, reply); + case TYPE80_RSP_CODE: + return convert_type80(zq, reply, + outputdata, outputdatalength); + default: /* Unknown response type, this should NEVER EVER happen */ + zq->online = 0; + pr_err("Cryptographic device %02x.%04x failed and was set offline\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid)); + ZCRYPT_DBF(DBF_ERR, + "device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + (unsigned int) rtype); + return -EAGAIN; /* repeat the request on a different device. */ + } +} + +/** + * This function is called from the AP bus code after a crypto request + * "msg" has finished with the reply message "reply". + * It is called from tasklet context. + * @aq: pointer to the AP device + * @msg: pointer to the AP message + * @reply: pointer to the AP reply message + */ +static void zcrypt_cex2a_receive(struct ap_queue *aq, + struct ap_message *msg, + struct ap_message *reply) +{ + static struct error_hdr error_reply = { + .type = TYPE82_RSP_CODE, + .reply_code = REP82_ERROR_MACHINE_FAILURE, + }; + struct type80_hdr *t80h; + int length; + + /* Copy the reply message to the request message buffer. */ + if (!reply) + goto out; /* ap_msg->rc indicates the error */ + t80h = reply->message; + if (t80h->type == TYPE80_RSP_CODE) { + if (aq->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A) + length = min_t(int, + CEX2A_MAX_RESPONSE_SIZE, t80h->len); + else + length = min_t(int, + CEX3A_MAX_RESPONSE_SIZE, t80h->len); + memcpy(msg->message, reply->message, length); + } else + memcpy(msg->message, reply->message, sizeof(error_reply)); +out: + complete((struct completion *) msg->private); +} + +static atomic_t zcrypt_step = ATOMIC_INIT(0); + +/** + * The request distributor calls this function if it picked the CEX2A + * device to handle a modexpo request. + * @zq: pointer to zcrypt_queue structure that identifies the + * CEX2A device to the request distributor + * @mex: pointer to the modexpo request buffer + */ +static long zcrypt_cex2a_modexpo(struct zcrypt_queue *zq, + struct ica_rsa_modexpo *mex) +{ + struct ap_message ap_msg; + struct completion work; + int rc; + + ap_init_message(&ap_msg); + if (zq->zcard->user_space_type == ZCRYPT_CEX2A) + ap_msg.message = kmalloc(MSGTYPE50_CRB2_MAX_MSG_SIZE, + GFP_KERNEL); + else + ap_msg.message = kmalloc(MSGTYPE50_CRB3_MAX_MSG_SIZE, + GFP_KERNEL); + if (!ap_msg.message) + return -ENOMEM; + ap_msg.receive = zcrypt_cex2a_receive; + ap_msg.psmid = (((unsigned long long) current->pid) << 32) + + atomic_inc_return(&zcrypt_step); + ap_msg.private = &work; + rc = ICAMEX_msg_to_type50MEX_msg(zq, &ap_msg, mex); + if (rc) + goto out_free; + init_completion(&work); + ap_queue_message(zq->queue, &ap_msg); + rc = wait_for_completion_interruptible(&work); + if (rc == 0) { + rc = ap_msg.rc; + if (rc == 0) + rc = convert_response(zq, &ap_msg, mex->outputdata, + mex->outputdatalength); + } else + /* Signal pending. */ + ap_cancel_message(zq->queue, &ap_msg); +out_free: + kfree(ap_msg.message); + return rc; +} + +/** + * The request distributor calls this function if it picked the CEX2A + * device to handle a modexpo_crt request. + * @zq: pointer to zcrypt_queue structure that identifies the + * CEX2A device to the request distributor + * @crt: pointer to the modexpoc_crt request buffer + */ +static long zcrypt_cex2a_modexpo_crt(struct zcrypt_queue *zq, + struct ica_rsa_modexpo_crt *crt) +{ + struct ap_message ap_msg; + struct completion work; + int rc; + + ap_init_message(&ap_msg); + if (zq->zcard->user_space_type == ZCRYPT_CEX2A) + ap_msg.message = kmalloc(MSGTYPE50_CRB2_MAX_MSG_SIZE, + GFP_KERNEL); + else + ap_msg.message = kmalloc(MSGTYPE50_CRB3_MAX_MSG_SIZE, + GFP_KERNEL); + if (!ap_msg.message) + return -ENOMEM; + ap_msg.receive = zcrypt_cex2a_receive; + ap_msg.psmid = (((unsigned long long) current->pid) << 32) + + atomic_inc_return(&zcrypt_step); + ap_msg.private = &work; + rc = ICACRT_msg_to_type50CRT_msg(zq, &ap_msg, crt); + if (rc) + goto out_free; + init_completion(&work); + ap_queue_message(zq->queue, &ap_msg); + rc = wait_for_completion_interruptible(&work); + if (rc == 0) { + rc = ap_msg.rc; + if (rc == 0) + rc = convert_response(zq, &ap_msg, crt->outputdata, + crt->outputdatalength); + } else + /* Signal pending. */ + ap_cancel_message(zq->queue, &ap_msg); +out_free: + kfree(ap_msg.message); + return rc; +} + +/** + * The crypto operations for message type 50. + */ +static struct zcrypt_ops zcrypt_msgtype50_ops = { + .rsa_modexpo = zcrypt_cex2a_modexpo, + .rsa_modexpo_crt = zcrypt_cex2a_modexpo_crt, + .owner = THIS_MODULE, + .name = MSGTYPE50_NAME, + .variant = MSGTYPE50_VARIANT_DEFAULT, +}; + +void __init zcrypt_msgtype50_init(void) +{ + zcrypt_msgtype_register(&zcrypt_msgtype50_ops); +} + +void __exit zcrypt_msgtype50_exit(void) +{ + zcrypt_msgtype_unregister(&zcrypt_msgtype50_ops); +} diff --git a/drivers/s390/crypto/zcrypt_msgtype50.h b/drivers/s390/crypto/zcrypt_msgtype50.h new file mode 100644 index 000000000..8530f652e --- /dev/null +++ b/drivers/s390/crypto/zcrypt_msgtype50.h @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * MSGTYPE restruct: Holger Dengler + */ + +#ifndef _ZCRYPT_MSGTYPE50_H_ +#define _ZCRYPT_MSGTYPE50_H_ + +#define MSGTYPE50_NAME "zcrypt_msgtype50" +#define MSGTYPE50_VARIANT_DEFAULT 0 + +#define MSGTYPE50_CRB2_MAX_MSG_SIZE 0x390 /* sizeof(struct type50_crb2_msg) */ +#define MSGTYPE50_CRB3_MAX_MSG_SIZE 0x710 /* sizeof(struct type50_crb3_msg) */ + +#define MSGTYPE_ADJUSTMENT 0x08 /* type04 extension (not needed in type50) */ + +unsigned int get_rsa_modex_fc(struct ica_rsa_modexpo *, int *); +unsigned int get_rsa_crt_fc(struct ica_rsa_modexpo_crt *, int *); + +void zcrypt_msgtype50_init(void); +void zcrypt_msgtype50_exit(void); + +#endif /* _ZCRYPT_MSGTYPE50_H_ */ diff --git a/drivers/s390/crypto/zcrypt_msgtype6.c b/drivers/s390/crypto/zcrypt_msgtype6.c new file mode 100644 index 000000000..2101776a8 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_msgtype6.c @@ -0,0 +1,1377 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * Ralph Wuerthner + * MSGTYPE restruct: Holger Dengler + */ + +#define KMSG_COMPONENT "zcrypt" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include + +#include "ap_bus.h" +#include "zcrypt_api.h" +#include "zcrypt_error.h" +#include "zcrypt_msgtype6.h" +#include "zcrypt_cca_key.h" + +#define PCIXCC_MIN_MOD_SIZE_OLD 64 /* 512 bits */ +#define PCIXCC_MAX_ICA_RESPONSE_SIZE 0x77c /* max size type86 v2 reply */ + +#define CEIL4(x) ((((x)+3)/4)*4) + +struct response_type { + struct completion work; + int type; +}; +#define PCIXCC_RESPONSE_TYPE_ICA 0 +#define PCIXCC_RESPONSE_TYPE_XCRB 1 +#define PCIXCC_RESPONSE_TYPE_EP11 2 + +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("Cryptographic Coprocessor (message type 6), " \ + "Copyright IBM Corp. 2001, 2012"); +MODULE_LICENSE("GPL"); + +/** + * CPRB + * Note that all shorts, ints and longs are little-endian. + * All pointer fields are 32-bits long, and mean nothing + * + * A request CPRB is followed by a request_parameter_block. + * + * The request (or reply) parameter block is organized thus: + * function code + * VUD block + * key block + */ +struct CPRB { + unsigned short cprb_len; /* CPRB length */ + unsigned char cprb_ver_id; /* CPRB version id. */ + unsigned char pad_000; /* Alignment pad byte. */ + unsigned char srpi_rtcode[4]; /* SRPI return code LELONG */ + unsigned char srpi_verb; /* SRPI verb type */ + unsigned char flags; /* flags */ + unsigned char func_id[2]; /* function id */ + unsigned char checkpoint_flag; /* */ + unsigned char resv2; /* reserved */ + unsigned short req_parml; /* request parameter buffer */ + /* length 16-bit little endian */ + unsigned char req_parmp[4]; /* request parameter buffer * + * pointer (means nothing: the * + * parameter buffer follows * + * the CPRB). */ + unsigned char req_datal[4]; /* request data buffer */ + /* length ULELONG */ + unsigned char req_datap[4]; /* request data buffer */ + /* pointer */ + unsigned short rpl_parml; /* reply parameter buffer */ + /* length 16-bit little endian */ + unsigned char pad_001[2]; /* Alignment pad bytes. ULESHORT */ + unsigned char rpl_parmp[4]; /* reply parameter buffer * + * pointer (means nothing: the * + * parameter buffer follows * + * the CPRB). */ + unsigned char rpl_datal[4]; /* reply data buffer len ULELONG */ + unsigned char rpl_datap[4]; /* reply data buffer */ + /* pointer */ + unsigned short ccp_rscode; /* server reason code ULESHORT */ + unsigned short ccp_rtcode; /* server return code ULESHORT */ + unsigned char repd_parml[2]; /* replied parameter len ULESHORT*/ + unsigned char mac_data_len[2]; /* Mac Data Length ULESHORT */ + unsigned char repd_datal[4]; /* replied data length ULELONG */ + unsigned char req_pc[2]; /* PC identifier */ + unsigned char res_origin[8]; /* resource origin */ + unsigned char mac_value[8]; /* Mac Value */ + unsigned char logon_id[8]; /* Logon Identifier */ + unsigned char usage_domain[2]; /* cdx */ + unsigned char resv3[18]; /* reserved for requestor */ + unsigned short svr_namel; /* server name length ULESHORT */ + unsigned char svr_name[8]; /* server name */ +} __packed; + +struct function_and_rules_block { + unsigned char function_code[2]; + unsigned short ulen; + unsigned char only_rule[8]; +} __packed; + +/** + * The following is used to initialize the CPRBX passed to the PCIXCC/CEX2C + * card in a type6 message. The 3 fields that must be filled in at execution + * time are req_parml, rpl_parml and usage_domain. + * Everything about this interface is ascii/big-endian, since the + * device does *not* have 'Intel inside'. + * + * The CPRBX is followed immediately by the parm block. + * The parm block contains: + * - function code ('PD' 0x5044 or 'PK' 0x504B) + * - rule block (one of:) + * + 0x000A 'PKCS-1.2' (MCL2 'PD') + * + 0x000A 'ZERO-PAD' (MCL2 'PK') + * + 0x000A 'ZERO-PAD' (MCL3 'PD' or CEX2C 'PD') + * + 0x000A 'MRP ' (MCL3 'PK' or CEX2C 'PK') + * - VUD block + */ +static const struct CPRBX static_cprbx = { + .cprb_len = 0x00DC, + .cprb_ver_id = 0x02, + .func_id = {0x54, 0x32}, +}; + +int speed_idx_cca(int req_type) +{ + switch (req_type) { + case 0x4142: + case 0x4149: + case 0x414D: + case 0x4341: + case 0x4344: + case 0x4354: + case 0x4358: + case 0x444B: + case 0x4558: + case 0x4643: + case 0x4651: + case 0x4C47: + case 0x4C4B: + case 0x4C51: + case 0x4F48: + case 0x504F: + case 0x5053: + case 0x5058: + case 0x5343: + case 0x5344: + case 0x5345: + case 0x5350: + return LOW; + case 0x414B: + case 0x4345: + case 0x4349: + case 0x434D: + case 0x4847: + case 0x4849: + case 0x484D: + case 0x4850: + case 0x4851: + case 0x4954: + case 0x4958: + case 0x4B43: + case 0x4B44: + case 0x4B45: + case 0x4B47: + case 0x4B48: + case 0x4B49: + case 0x4B4E: + case 0x4B50: + case 0x4B52: + case 0x4B54: + case 0x4B58: + case 0x4D50: + case 0x4D53: + case 0x4D56: + case 0x4D58: + case 0x5044: + case 0x5045: + case 0x5046: + case 0x5047: + case 0x5049: + case 0x504B: + case 0x504D: + case 0x5254: + case 0x5347: + case 0x5349: + case 0x534B: + case 0x534D: + case 0x5356: + case 0x5358: + case 0x5443: + case 0x544B: + case 0x5647: + return HIGH; + default: + return MEDIUM; + } +} + +int speed_idx_ep11(int req_type) +{ + switch (req_type) { + case 1: + case 2: + case 36: + case 37: + case 38: + case 39: + case 40: + return LOW; + case 17: + case 18: + case 19: + case 20: + case 21: + case 22: + case 26: + case 30: + case 31: + case 32: + case 33: + case 34: + case 35: + return HIGH; + default: + return MEDIUM; + } +} + + +/** + * Convert a ICAMEX message to a type6 MEX message. + * + * @zq: crypto device pointer + * @ap_msg: pointer to AP message + * @mex: pointer to user input data + * + * Returns 0 on success or negative errno value. + */ +static int ICAMEX_msg_to_type6MEX_msgX(struct zcrypt_queue *zq, + struct ap_message *ap_msg, + struct ica_rsa_modexpo *mex) +{ + static struct type6_hdr static_type6_hdrX = { + .type = 0x06, + .offset1 = 0x00000058, + .agent_id = {'C', 'A',}, + .function_code = {'P', 'K'}, + }; + static struct function_and_rules_block static_pke_fnr = { + .function_code = {'P', 'K'}, + .ulen = 10, + .only_rule = {'M', 'R', 'P', ' ', ' ', ' ', ' ', ' '} + }; + struct { + struct type6_hdr hdr; + struct CPRBX cprbx; + struct function_and_rules_block fr; + unsigned short length; + char text[0]; + } __packed * msg = ap_msg->message; + int size; + + /* + * The inputdatalength was a selection criteria in the dispatching + * function zcrypt_rsa_modexpo(). However, make sure the following + * copy_from_user() never exceeds the allocated buffer space. + */ + if (WARN_ON_ONCE(mex->inputdatalength > PAGE_SIZE)) + return -EINVAL; + + /* VUD.ciphertext */ + msg->length = mex->inputdatalength + 2; + if (copy_from_user(msg->text, mex->inputdata, mex->inputdatalength)) + return -EFAULT; + + /* Set up key which is located after the variable length text. */ + size = zcrypt_type6_mex_key_en(mex, msg->text+mex->inputdatalength); + if (size < 0) + return size; + size += sizeof(*msg) + mex->inputdatalength; + + /* message header, cprbx and f&r */ + msg->hdr = static_type6_hdrX; + msg->hdr.ToCardLen1 = size - sizeof(msg->hdr); + msg->hdr.FromCardLen1 = PCIXCC_MAX_ICA_RESPONSE_SIZE - sizeof(msg->hdr); + + msg->cprbx = static_cprbx; + msg->cprbx.domain = AP_QID_QUEUE(zq->queue->qid); + msg->cprbx.rpl_msgbl = msg->hdr.FromCardLen1; + + msg->fr = static_pke_fnr; + + msg->cprbx.req_parml = size - sizeof(msg->hdr) - sizeof(msg->cprbx); + + ap_msg->length = size; + return 0; +} + +/** + * Convert a ICACRT message to a type6 CRT message. + * + * @zq: crypto device pointer + * @ap_msg: pointer to AP message + * @crt: pointer to user input data + * + * Returns 0 on success or negative errno value. + */ +static int ICACRT_msg_to_type6CRT_msgX(struct zcrypt_queue *zq, + struct ap_message *ap_msg, + struct ica_rsa_modexpo_crt *crt) +{ + static struct type6_hdr static_type6_hdrX = { + .type = 0x06, + .offset1 = 0x00000058, + .agent_id = {'C', 'A',}, + .function_code = {'P', 'D'}, + }; + static struct function_and_rules_block static_pkd_fnr = { + .function_code = {'P', 'D'}, + .ulen = 10, + .only_rule = {'Z', 'E', 'R', 'O', '-', 'P', 'A', 'D'} + }; + + struct { + struct type6_hdr hdr; + struct CPRBX cprbx; + struct function_and_rules_block fr; + unsigned short length; + char text[0]; + } __packed * msg = ap_msg->message; + int size; + + /* + * The inputdatalength was a selection criteria in the dispatching + * function zcrypt_rsa_crt(). However, make sure the following + * copy_from_user() never exceeds the allocated buffer space. + */ + if (WARN_ON_ONCE(crt->inputdatalength > PAGE_SIZE)) + return -EINVAL; + + /* VUD.ciphertext */ + msg->length = crt->inputdatalength + 2; + if (copy_from_user(msg->text, crt->inputdata, crt->inputdatalength)) + return -EFAULT; + + /* Set up key which is located after the variable length text. */ + size = zcrypt_type6_crt_key(crt, msg->text + crt->inputdatalength); + if (size < 0) + return size; + size += sizeof(*msg) + crt->inputdatalength; /* total size of msg */ + + /* message header, cprbx and f&r */ + msg->hdr = static_type6_hdrX; + msg->hdr.ToCardLen1 = size - sizeof(msg->hdr); + msg->hdr.FromCardLen1 = PCIXCC_MAX_ICA_RESPONSE_SIZE - sizeof(msg->hdr); + + msg->cprbx = static_cprbx; + msg->cprbx.domain = AP_QID_QUEUE(zq->queue->qid); + msg->cprbx.req_parml = msg->cprbx.rpl_msgbl = + size - sizeof(msg->hdr) - sizeof(msg->cprbx); + + msg->fr = static_pkd_fnr; + + ap_msg->length = size; + return 0; +} + +/** + * Convert a XCRB message to a type6 CPRB message. + * + * @zq: crypto device pointer + * @ap_msg: pointer to AP message + * @xcRB: pointer to user input data + * + * Returns 0 on success or -EFAULT, -EINVAL. + */ +struct type86_fmt2_msg { + struct type86_hdr hdr; + struct type86_fmt2_ext fmt2; +} __packed; + +static int XCRB_msg_to_type6CPRB_msgX(struct ap_message *ap_msg, + struct ica_xcRB *xcRB, + unsigned int *fcode, + unsigned short **dom) +{ + static struct type6_hdr static_type6_hdrX = { + .type = 0x06, + .offset1 = 0x00000058, + }; + struct { + struct type6_hdr hdr; + struct CPRBX cprbx; + } __packed * msg = ap_msg->message; + + int rcblen = CEIL4(xcRB->request_control_blk_length); + int replylen, req_sumlen, resp_sumlen; + char *req_data = ap_msg->message + sizeof(struct type6_hdr) + rcblen; + char *function_code; + + if (CEIL4(xcRB->request_control_blk_length) < + xcRB->request_control_blk_length) + return -EINVAL; /* overflow after alignment*/ + + /* length checks */ + ap_msg->length = sizeof(struct type6_hdr) + + CEIL4(xcRB->request_control_blk_length) + + xcRB->request_data_length; + if (ap_msg->length > MSGTYPE06_MAX_MSG_SIZE) + return -EINVAL; + + /* + * Overflow check + * sum must be greater (or equal) than the largest operand + */ + req_sumlen = CEIL4(xcRB->request_control_blk_length) + + xcRB->request_data_length; + if ((CEIL4(xcRB->request_control_blk_length) <= + xcRB->request_data_length) ? + (req_sumlen < xcRB->request_data_length) : + (req_sumlen < CEIL4(xcRB->request_control_blk_length))) { + return -EINVAL; + } + + if (CEIL4(xcRB->reply_control_blk_length) < + xcRB->reply_control_blk_length) + return -EINVAL; /* overflow after alignment*/ + + replylen = sizeof(struct type86_fmt2_msg) + + CEIL4(xcRB->reply_control_blk_length) + + xcRB->reply_data_length; + if (replylen > MSGTYPE06_MAX_MSG_SIZE) + return -EINVAL; + + /* + * Overflow check + * sum must be greater (or equal) than the largest operand + */ + resp_sumlen = CEIL4(xcRB->reply_control_blk_length) + + xcRB->reply_data_length; + if ((CEIL4(xcRB->reply_control_blk_length) <= xcRB->reply_data_length) ? + (resp_sumlen < xcRB->reply_data_length) : + (resp_sumlen < CEIL4(xcRB->reply_control_blk_length))) { + return -EINVAL; + } + + /* prepare type6 header */ + msg->hdr = static_type6_hdrX; + memcpy(msg->hdr.agent_id, &(xcRB->agent_ID), sizeof(xcRB->agent_ID)); + msg->hdr.ToCardLen1 = xcRB->request_control_blk_length; + if (xcRB->request_data_length) { + msg->hdr.offset2 = msg->hdr.offset1 + rcblen; + msg->hdr.ToCardLen2 = xcRB->request_data_length; + } + msg->hdr.FromCardLen1 = xcRB->reply_control_blk_length; + msg->hdr.FromCardLen2 = xcRB->reply_data_length; + + /* prepare CPRB */ + if (copy_from_user(&(msg->cprbx), xcRB->request_control_blk_addr, + xcRB->request_control_blk_length)) + return -EFAULT; + if (msg->cprbx.cprb_len + sizeof(msg->hdr.function_code) > + xcRB->request_control_blk_length) + return -EINVAL; + function_code = ((unsigned char *)&msg->cprbx) + msg->cprbx.cprb_len; + memcpy(msg->hdr.function_code, function_code, + sizeof(msg->hdr.function_code)); + + *fcode = (msg->hdr.function_code[0] << 8) | msg->hdr.function_code[1]; + *dom = (unsigned short *)&msg->cprbx.domain; + + if (memcmp(function_code, "US", 2) == 0 + || memcmp(function_code, "AU", 2) == 0) + ap_msg->special = 1; + else + ap_msg->special = 0; + + /* copy data block */ + if (xcRB->request_data_length && + copy_from_user(req_data, xcRB->request_data_address, + xcRB->request_data_length)) + return -EFAULT; + + return 0; +} + +static int xcrb_msg_to_type6_ep11cprb_msgx(struct ap_message *ap_msg, + struct ep11_urb *xcRB, + unsigned int *fcode) +{ + unsigned int lfmt; + static struct type6_hdr static_type6_ep11_hdr = { + .type = 0x06, + .rqid = {0x00, 0x01}, + .function_code = {0x00, 0x00}, + .agent_id[0] = 0x58, /* {'X'} */ + .agent_id[1] = 0x43, /* {'C'} */ + .offset1 = 0x00000058, + }; + + struct { + struct type6_hdr hdr; + struct ep11_cprb cprbx; + unsigned char pld_tag; /* fixed value 0x30 */ + unsigned char pld_lenfmt; /* payload length format */ + } __packed * msg = ap_msg->message; + + struct pld_hdr { + unsigned char func_tag; /* fixed value 0x4 */ + unsigned char func_len; /* fixed value 0x4 */ + unsigned int func_val; /* function ID */ + unsigned char dom_tag; /* fixed value 0x4 */ + unsigned char dom_len; /* fixed value 0x4 */ + unsigned int dom_val; /* domain id */ + } __packed * payload_hdr = NULL; + + if (CEIL4(xcRB->req_len) < xcRB->req_len) + return -EINVAL; /* overflow after alignment*/ + + /* length checks */ + ap_msg->length = sizeof(struct type6_hdr) + xcRB->req_len; + if (CEIL4(xcRB->req_len) > MSGTYPE06_MAX_MSG_SIZE - + (sizeof(struct type6_hdr))) + return -EINVAL; + + if (CEIL4(xcRB->resp_len) < xcRB->resp_len) + return -EINVAL; /* overflow after alignment*/ + + if (CEIL4(xcRB->resp_len) > MSGTYPE06_MAX_MSG_SIZE - + (sizeof(struct type86_fmt2_msg))) + return -EINVAL; + + /* prepare type6 header */ + msg->hdr = static_type6_ep11_hdr; + msg->hdr.ToCardLen1 = xcRB->req_len; + msg->hdr.FromCardLen1 = xcRB->resp_len; + + /* Import CPRB data from the ioctl input parameter */ + if (copy_from_user(&(msg->cprbx.cprb_len), + (char __force __user *)xcRB->req, xcRB->req_len)) { + return -EFAULT; + } + + if ((msg->pld_lenfmt & 0x80) == 0x80) { /*ext.len.fmt 2 or 3*/ + switch (msg->pld_lenfmt & 0x03) { + case 1: + lfmt = 2; + break; + case 2: + lfmt = 3; + break; + default: + return -EINVAL; + } + } else { + lfmt = 1; /* length format #1 */ + } + payload_hdr = (struct pld_hdr *)((&(msg->pld_lenfmt))+lfmt); + *fcode = payload_hdr->func_val & 0xFFFF; + + return 0; +} + +/** + * Copy results from a type 86 ICA reply message back to user space. + * + * @zq: crypto device pointer + * @reply: reply AP message. + * @data: pointer to user output data + * @length: size of user output data + * + * Returns 0 on success or -EINVAL, -EFAULT, -EAGAIN in case of an error. + */ +struct type86x_reply { + struct type86_hdr hdr; + struct type86_fmt2_ext fmt2; + struct CPRBX cprbx; + unsigned char pad[4]; /* 4 byte function code/rules block ? */ + unsigned short length; + char text[0]; +} __packed; + +struct type86_ep11_reply { + struct type86_hdr hdr; + struct type86_fmt2_ext fmt2; + struct ep11_cprb cprbx; +} __packed; + +static int convert_type86_ica(struct zcrypt_queue *zq, + struct ap_message *reply, + char __user *outputdata, + unsigned int outputdatalength) +{ + static unsigned char static_pad[] = { + 0x00, 0x02, + 0x1B, 0x7B, 0x5D, 0xB5, 0x75, 0x01, 0x3D, 0xFD, + 0x8D, 0xD1, 0xC7, 0x03, 0x2D, 0x09, 0x23, 0x57, + 0x89, 0x49, 0xB9, 0x3F, 0xBB, 0x99, 0x41, 0x5B, + 0x75, 0x21, 0x7B, 0x9D, 0x3B, 0x6B, 0x51, 0x39, + 0xBB, 0x0D, 0x35, 0xB9, 0x89, 0x0F, 0x93, 0xA5, + 0x0B, 0x47, 0xF1, 0xD3, 0xBB, 0xCB, 0xF1, 0x9D, + 0x23, 0x73, 0x71, 0xFF, 0xF3, 0xF5, 0x45, 0xFB, + 0x61, 0x29, 0x23, 0xFD, 0xF1, 0x29, 0x3F, 0x7F, + 0x17, 0xB7, 0x1B, 0xA9, 0x19, 0xBD, 0x57, 0xA9, + 0xD7, 0x95, 0xA3, 0xCB, 0xED, 0x1D, 0xDB, 0x45, + 0x7D, 0x11, 0xD1, 0x51, 0x1B, 0xED, 0x71, 0xE9, + 0xB1, 0xD1, 0xAB, 0xAB, 0x21, 0x2B, 0x1B, 0x9F, + 0x3B, 0x9F, 0xF7, 0xF7, 0xBD, 0x63, 0xEB, 0xAD, + 0xDF, 0xB3, 0x6F, 0x5B, 0xDB, 0x8D, 0xA9, 0x5D, + 0xE3, 0x7D, 0x77, 0x49, 0x47, 0xF5, 0xA7, 0xFD, + 0xAB, 0x2F, 0x27, 0x35, 0x77, 0xD3, 0x49, 0xC9, + 0x09, 0xEB, 0xB1, 0xF9, 0xBF, 0x4B, 0xCB, 0x2B, + 0xEB, 0xEB, 0x05, 0xFF, 0x7D, 0xC7, 0x91, 0x8B, + 0x09, 0x83, 0xB9, 0xB9, 0x69, 0x33, 0x39, 0x6B, + 0x79, 0x75, 0x19, 0xBF, 0xBB, 0x07, 0x1D, 0xBD, + 0x29, 0xBF, 0x39, 0x95, 0x93, 0x1D, 0x35, 0xC7, + 0xC9, 0x4D, 0xE5, 0x97, 0x0B, 0x43, 0x9B, 0xF1, + 0x16, 0x93, 0x03, 0x1F, 0xA5, 0xFB, 0xDB, 0xF3, + 0x27, 0x4F, 0x27, 0x61, 0x05, 0x1F, 0xB9, 0x23, + 0x2F, 0xC3, 0x81, 0xA9, 0x23, 0x71, 0x55, 0x55, + 0xEB, 0xED, 0x41, 0xE5, 0xF3, 0x11, 0xF1, 0x43, + 0x69, 0x03, 0xBD, 0x0B, 0x37, 0x0F, 0x51, 0x8F, + 0x0B, 0xB5, 0x89, 0x5B, 0x67, 0xA9, 0xD9, 0x4F, + 0x01, 0xF9, 0x21, 0x77, 0x37, 0x73, 0x79, 0xC5, + 0x7F, 0x51, 0xC1, 0xCF, 0x97, 0xA1, 0x75, 0xAD, + 0x35, 0x9D, 0xD3, 0xD3, 0xA7, 0x9D, 0x5D, 0x41, + 0x6F, 0x65, 0x1B, 0xCF, 0xA9, 0x87, 0x91, 0x09 + }; + struct type86x_reply *msg = reply->message; + unsigned short service_rc, service_rs; + unsigned int reply_len, pad_len; + char *data; + + service_rc = msg->cprbx.ccp_rtcode; + if (unlikely(service_rc != 0)) { + service_rs = msg->cprbx.ccp_rscode; + if ((service_rc == 8 && service_rs == 66) || + (service_rc == 8 && service_rs == 65) || + (service_rc == 8 && service_rs == 72) || + (service_rc == 8 && service_rs == 770) || + (service_rc == 12 && service_rs == 769)) { + ZCRYPT_DBF(DBF_DEBUG, + "device=%02x.%04x rc/rs=%d/%d => rc=EINVAL\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + (int) service_rc, (int) service_rs); + return -EINVAL; + } + if (service_rc == 8 && service_rs == 783) { + zq->zcard->min_mod_size = + PCIXCC_MIN_MOD_SIZE_OLD; + ZCRYPT_DBF(DBF_DEBUG, + "device=%02x.%04x rc/rs=%d/%d => rc=EAGAIN\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + (int) service_rc, (int) service_rs); + return -EAGAIN; + } + zq->online = 0; + pr_err("Cryptographic device %02x.%04x failed and was set offline\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid)); + ZCRYPT_DBF(DBF_ERR, + "device=%02x.%04x rc/rs=%d/%d => online=0 rc=EAGAIN\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + (int) service_rc, (int) service_rs); + return -EAGAIN; /* repeat the request on a different device. */ + } + data = msg->text; + reply_len = msg->length - 2; + if (reply_len > outputdatalength) + return -EINVAL; + /* + * For all encipher requests, the length of the ciphertext (reply_len) + * will always equal the modulus length. For MEX decipher requests + * the output needs to get padded. Minimum pad size is 10. + * + * Currently, the cases where padding will be added is for: + * - PCIXCC_MCL2 using a CRT form token (since PKD didn't support + * ZERO-PAD and CRT is only supported for PKD requests) + * - PCICC, always + */ + pad_len = outputdatalength - reply_len; + if (pad_len > 0) { + if (pad_len < 10) + return -EINVAL; + /* 'restore' padding left in the PCICC/PCIXCC card. */ + if (copy_to_user(outputdata, static_pad, pad_len - 1)) + return -EFAULT; + if (put_user(0, outputdata + pad_len - 1)) + return -EFAULT; + } + /* Copy the crypto response to user space. */ + if (copy_to_user(outputdata + pad_len, data, reply_len)) + return -EFAULT; + return 0; +} + +/** + * Copy results from a type 86 XCRB reply message back to user space. + * + * @zq: crypto device pointer + * @reply: reply AP message. + * @xcRB: pointer to XCRB + * + * Returns 0 on success or -EINVAL, -EFAULT, -EAGAIN in case of an error. + */ +static int convert_type86_xcrb(struct zcrypt_queue *zq, + struct ap_message *reply, + struct ica_xcRB *xcRB) +{ + struct type86_fmt2_msg *msg = reply->message; + char *data = reply->message; + + /* Copy CPRB to user */ + if (copy_to_user(xcRB->reply_control_blk_addr, + data + msg->fmt2.offset1, msg->fmt2.count1)) + return -EFAULT; + xcRB->reply_control_blk_length = msg->fmt2.count1; + + /* Copy data buffer to user */ + if (msg->fmt2.count2) + if (copy_to_user(xcRB->reply_data_addr, + data + msg->fmt2.offset2, msg->fmt2.count2)) + return -EFAULT; + xcRB->reply_data_length = msg->fmt2.count2; + return 0; +} + +/** + * Copy results from a type 86 EP11 XCRB reply message back to user space. + * + * @zq: crypto device pointer + * @reply: reply AP message. + * @xcRB: pointer to EP11 user request block + * + * Returns 0 on success or -EINVAL, -EFAULT, -EAGAIN in case of an error. + */ +static int convert_type86_ep11_xcrb(struct zcrypt_queue *zq, + struct ap_message *reply, + struct ep11_urb *xcRB) +{ + struct type86_fmt2_msg *msg = reply->message; + char *data = reply->message; + + if (xcRB->resp_len < msg->fmt2.count1) + return -EINVAL; + + /* Copy response CPRB to user */ + if (copy_to_user((char __force __user *)xcRB->resp, + data + msg->fmt2.offset1, msg->fmt2.count1)) + return -EFAULT; + xcRB->resp_len = msg->fmt2.count1; + return 0; +} + +static int convert_type86_rng(struct zcrypt_queue *zq, + struct ap_message *reply, + char *buffer) +{ + struct { + struct type86_hdr hdr; + struct type86_fmt2_ext fmt2; + struct CPRBX cprbx; + } __packed * msg = reply->message; + char *data = reply->message; + + if (msg->cprbx.ccp_rtcode != 0 || msg->cprbx.ccp_rscode != 0) + return -EINVAL; + memcpy(buffer, data + msg->fmt2.offset2, msg->fmt2.count2); + return msg->fmt2.count2; +} + +static int convert_response_ica(struct zcrypt_queue *zq, + struct ap_message *reply, + char __user *outputdata, + unsigned int outputdatalength) +{ + struct type86x_reply *msg = reply->message; + + switch (msg->hdr.type) { + case TYPE82_RSP_CODE: + case TYPE88_RSP_CODE: + return convert_error(zq, reply); + case TYPE86_RSP_CODE: + if (msg->cprbx.ccp_rtcode && + (msg->cprbx.ccp_rscode == 0x14f) && + (outputdatalength > 256)) { + if (zq->zcard->max_exp_bit_length <= 17) { + zq->zcard->max_exp_bit_length = 17; + return -EAGAIN; + } else + return -EINVAL; + } + if (msg->hdr.reply_code) + return convert_error(zq, reply); + if (msg->cprbx.cprb_ver_id == 0x02) + return convert_type86_ica(zq, reply, + outputdata, outputdatalength); + /* + * Fall through, no break, incorrect cprb version is an unknown + * response + */ + default: /* Unknown response type, this should NEVER EVER happen */ + zq->online = 0; + pr_err("Cryptographic device %02x.%04x failed and was set offline\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid)); + ZCRYPT_DBF(DBF_ERR, + "device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + (int) msg->hdr.type); + return -EAGAIN; /* repeat the request on a different device. */ + } +} + +static int convert_response_xcrb(struct zcrypt_queue *zq, + struct ap_message *reply, + struct ica_xcRB *xcRB) +{ + struct type86x_reply *msg = reply->message; + + switch (msg->hdr.type) { + case TYPE82_RSP_CODE: + case TYPE88_RSP_CODE: + xcRB->status = 0x0008044DL; /* HDD_InvalidParm */ + return convert_error(zq, reply); + case TYPE86_RSP_CODE: + if (msg->hdr.reply_code) { + memcpy(&(xcRB->status), msg->fmt2.apfs, sizeof(u32)); + return convert_error(zq, reply); + } + if (msg->cprbx.cprb_ver_id == 0x02) + return convert_type86_xcrb(zq, reply, xcRB); + /* + * Fall through, no break, incorrect cprb version is an unknown + * response + */ + default: /* Unknown response type, this should NEVER EVER happen */ + xcRB->status = 0x0008044DL; /* HDD_InvalidParm */ + zq->online = 0; + pr_err("Cryptographic device %02x.%04x failed and was set offline\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid)); + ZCRYPT_DBF(DBF_ERR, + "device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + (int) msg->hdr.type); + return -EAGAIN; /* repeat the request on a different device. */ + } +} + +static int convert_response_ep11_xcrb(struct zcrypt_queue *zq, + struct ap_message *reply, struct ep11_urb *xcRB) +{ + struct type86_ep11_reply *msg = reply->message; + + switch (msg->hdr.type) { + case TYPE82_RSP_CODE: + case TYPE87_RSP_CODE: + return convert_error(zq, reply); + case TYPE86_RSP_CODE: + if (msg->hdr.reply_code) + return convert_error(zq, reply); + if (msg->cprbx.cprb_ver_id == 0x04) + return convert_type86_ep11_xcrb(zq, reply, xcRB); + /* Fall through, no break, incorrect cprb version is an unknown resp.*/ + default: /* Unknown response type, this should NEVER EVER happen */ + zq->online = 0; + pr_err("Cryptographic device %02x.%04x failed and was set offline\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid)); + ZCRYPT_DBF(DBF_ERR, + "device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + (int) msg->hdr.type); + return -EAGAIN; /* repeat the request on a different device. */ + } +} + +static int convert_response_rng(struct zcrypt_queue *zq, + struct ap_message *reply, + char *data) +{ + struct type86x_reply *msg = reply->message; + + switch (msg->hdr.type) { + case TYPE82_RSP_CODE: + case TYPE88_RSP_CODE: + return -EINVAL; + case TYPE86_RSP_CODE: + if (msg->hdr.reply_code) + return -EINVAL; + if (msg->cprbx.cprb_ver_id == 0x02) + return convert_type86_rng(zq, reply, data); + /* + * Fall through, no break, incorrect cprb version is an unknown + * response + */ + default: /* Unknown response type, this should NEVER EVER happen */ + zq->online = 0; + pr_err("Cryptographic device %02x.%04x failed and was set offline\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid)); + ZCRYPT_DBF(DBF_ERR, + "device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + (int) msg->hdr.type); + return -EAGAIN; /* repeat the request on a different device. */ + } +} + +/** + * This function is called from the AP bus code after a crypto request + * "msg" has finished with the reply message "reply". + * It is called from tasklet context. + * @aq: pointer to the AP queue + * @msg: pointer to the AP message + * @reply: pointer to the AP reply message + */ +static void zcrypt_msgtype6_receive(struct ap_queue *aq, + struct ap_message *msg, + struct ap_message *reply) +{ + static struct error_hdr error_reply = { + .type = TYPE82_RSP_CODE, + .reply_code = REP82_ERROR_MACHINE_FAILURE, + }; + struct response_type *resp_type = + (struct response_type *) msg->private; + struct type86x_reply *t86r; + int length; + + /* Copy the reply message to the request message buffer. */ + if (!reply) + goto out; /* ap_msg->rc indicates the error */ + t86r = reply->message; + if (t86r->hdr.type == TYPE86_RSP_CODE && + t86r->cprbx.cprb_ver_id == 0x02) { + switch (resp_type->type) { + case PCIXCC_RESPONSE_TYPE_ICA: + length = sizeof(struct type86x_reply) + + t86r->length - 2; + length = min(PCIXCC_MAX_ICA_RESPONSE_SIZE, length); + memcpy(msg->message, reply->message, length); + break; + case PCIXCC_RESPONSE_TYPE_XCRB: + length = t86r->fmt2.offset2 + t86r->fmt2.count2; + length = min(MSGTYPE06_MAX_MSG_SIZE, length); + memcpy(msg->message, reply->message, length); + break; + default: + memcpy(msg->message, &error_reply, + sizeof(error_reply)); + } + } else + memcpy(msg->message, reply->message, sizeof(error_reply)); +out: + complete(&(resp_type->work)); +} + +/** + * This function is called from the AP bus code after a crypto request + * "msg" has finished with the reply message "reply". + * It is called from tasklet context. + * @aq: pointer to the AP queue + * @msg: pointer to the AP message + * @reply: pointer to the AP reply message + */ +static void zcrypt_msgtype6_receive_ep11(struct ap_queue *aq, + struct ap_message *msg, + struct ap_message *reply) +{ + static struct error_hdr error_reply = { + .type = TYPE82_RSP_CODE, + .reply_code = REP82_ERROR_MACHINE_FAILURE, + }; + struct response_type *resp_type = + (struct response_type *)msg->private; + struct type86_ep11_reply *t86r; + int length; + + /* Copy the reply message to the request message buffer. */ + if (!reply) + goto out; /* ap_msg->rc indicates the error */ + t86r = reply->message; + if (t86r->hdr.type == TYPE86_RSP_CODE && + t86r->cprbx.cprb_ver_id == 0x04) { + switch (resp_type->type) { + case PCIXCC_RESPONSE_TYPE_EP11: + length = t86r->fmt2.offset1 + t86r->fmt2.count1; + length = min(MSGTYPE06_MAX_MSG_SIZE, length); + memcpy(msg->message, reply->message, length); + break; + default: + memcpy(msg->message, &error_reply, sizeof(error_reply)); + } + } else { + memcpy(msg->message, reply->message, sizeof(error_reply)); + } +out: + complete(&(resp_type->work)); +} + +static atomic_t zcrypt_step = ATOMIC_INIT(0); + +/** + * The request distributor calls this function if it picked the PCIXCC/CEX2C + * device to handle a modexpo request. + * @zq: pointer to zcrypt_queue structure that identifies the + * PCIXCC/CEX2C device to the request distributor + * @mex: pointer to the modexpo request buffer + */ +static long zcrypt_msgtype6_modexpo(struct zcrypt_queue *zq, + struct ica_rsa_modexpo *mex) +{ + struct ap_message ap_msg; + struct response_type resp_type = { + .type = PCIXCC_RESPONSE_TYPE_ICA, + }; + int rc; + + ap_init_message(&ap_msg); + ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL); + if (!ap_msg.message) + return -ENOMEM; + ap_msg.receive = zcrypt_msgtype6_receive; + ap_msg.psmid = (((unsigned long long) current->pid) << 32) + + atomic_inc_return(&zcrypt_step); + ap_msg.private = &resp_type; + rc = ICAMEX_msg_to_type6MEX_msgX(zq, &ap_msg, mex); + if (rc) + goto out_free; + init_completion(&resp_type.work); + ap_queue_message(zq->queue, &ap_msg); + rc = wait_for_completion_interruptible(&resp_type.work); + if (rc == 0) { + rc = ap_msg.rc; + if (rc == 0) + rc = convert_response_ica(zq, &ap_msg, + mex->outputdata, + mex->outputdatalength); + } else + /* Signal pending. */ + ap_cancel_message(zq->queue, &ap_msg); +out_free: + free_page((unsigned long) ap_msg.message); + return rc; +} + +/** + * The request distributor calls this function if it picked the PCIXCC/CEX2C + * device to handle a modexpo_crt request. + * @zq: pointer to zcrypt_queue structure that identifies the + * PCIXCC/CEX2C device to the request distributor + * @crt: pointer to the modexpoc_crt request buffer + */ +static long zcrypt_msgtype6_modexpo_crt(struct zcrypt_queue *zq, + struct ica_rsa_modexpo_crt *crt) +{ + struct ap_message ap_msg; + struct response_type resp_type = { + .type = PCIXCC_RESPONSE_TYPE_ICA, + }; + int rc; + + ap_init_message(&ap_msg); + ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL); + if (!ap_msg.message) + return -ENOMEM; + ap_msg.receive = zcrypt_msgtype6_receive; + ap_msg.psmid = (((unsigned long long) current->pid) << 32) + + atomic_inc_return(&zcrypt_step); + ap_msg.private = &resp_type; + rc = ICACRT_msg_to_type6CRT_msgX(zq, &ap_msg, crt); + if (rc) + goto out_free; + init_completion(&resp_type.work); + ap_queue_message(zq->queue, &ap_msg); + rc = wait_for_completion_interruptible(&resp_type.work); + if (rc == 0) { + rc = ap_msg.rc; + if (rc == 0) + rc = convert_response_ica(zq, &ap_msg, + crt->outputdata, + crt->outputdatalength); + } else { + /* Signal pending. */ + ap_cancel_message(zq->queue, &ap_msg); + } +out_free: + free_page((unsigned long) ap_msg.message); + return rc; +} + +/** + * Fetch function code from cprb. + * Extracting the fc requires to copy the cprb from userspace. + * So this function allocates memory and needs an ap_msg prepared + * by the caller with ap_init_message(). Also the caller has to + * make sure ap_release_message() is always called even on failure. + */ +unsigned int get_cprb_fc(struct ica_xcRB *xcRB, + struct ap_message *ap_msg, + unsigned int *func_code, unsigned short **dom) +{ + struct response_type resp_type = { + .type = PCIXCC_RESPONSE_TYPE_XCRB, + }; + + ap_msg->message = kmalloc(MSGTYPE06_MAX_MSG_SIZE, GFP_KERNEL); + if (!ap_msg->message) + return -ENOMEM; + ap_msg->receive = zcrypt_msgtype6_receive; + ap_msg->psmid = (((unsigned long long) current->pid) << 32) + + atomic_inc_return(&zcrypt_step); + ap_msg->private = kmalloc(sizeof(resp_type), GFP_KERNEL); + if (!ap_msg->private) + return -ENOMEM; + memcpy(ap_msg->private, &resp_type, sizeof(resp_type)); + return XCRB_msg_to_type6CPRB_msgX(ap_msg, xcRB, func_code, dom); +} + +/** + * The request distributor calls this function if it picked the PCIXCC/CEX2C + * device to handle a send_cprb request. + * @zq: pointer to zcrypt_queue structure that identifies the + * PCIXCC/CEX2C device to the request distributor + * @xcRB: pointer to the send_cprb request buffer + */ +static long zcrypt_msgtype6_send_cprb(struct zcrypt_queue *zq, + struct ica_xcRB *xcRB, + struct ap_message *ap_msg) +{ + int rc; + struct response_type *rtype = (struct response_type *)(ap_msg->private); + + init_completion(&rtype->work); + ap_queue_message(zq->queue, ap_msg); + rc = wait_for_completion_interruptible(&rtype->work); + if (rc == 0) { + rc = ap_msg->rc; + if (rc == 0) + rc = convert_response_xcrb(zq, ap_msg, xcRB); + } else + /* Signal pending. */ + ap_cancel_message(zq->queue, ap_msg); + + return rc; +} + +/** + * Fetch function code from ep11 cprb. + * Extracting the fc requires to copy the ep11 cprb from userspace. + * So this function allocates memory and needs an ap_msg prepared + * by the caller with ap_init_message(). Also the caller has to + * make sure ap_release_message() is always called even on failure. + */ +unsigned int get_ep11cprb_fc(struct ep11_urb *xcrb, + struct ap_message *ap_msg, + unsigned int *func_code) +{ + struct response_type resp_type = { + .type = PCIXCC_RESPONSE_TYPE_EP11, + }; + + ap_msg->message = kmalloc(MSGTYPE06_MAX_MSG_SIZE, GFP_KERNEL); + if (!ap_msg->message) + return -ENOMEM; + ap_msg->receive = zcrypt_msgtype6_receive_ep11; + ap_msg->psmid = (((unsigned long long) current->pid) << 32) + + atomic_inc_return(&zcrypt_step); + ap_msg->private = kmalloc(sizeof(resp_type), GFP_KERNEL); + if (!ap_msg->private) + return -ENOMEM; + memcpy(ap_msg->private, &resp_type, sizeof(resp_type)); + return xcrb_msg_to_type6_ep11cprb_msgx(ap_msg, xcrb, func_code); +} + +/** + * The request distributor calls this function if it picked the CEX4P + * device to handle a send_ep11_cprb request. + * @zq: pointer to zcrypt_queue structure that identifies the + * CEX4P device to the request distributor + * @xcRB: pointer to the ep11 user request block + */ +static long zcrypt_msgtype6_send_ep11_cprb(struct zcrypt_queue *zq, + struct ep11_urb *xcrb, + struct ap_message *ap_msg) +{ + int rc; + unsigned int lfmt; + struct response_type *rtype = (struct response_type *)(ap_msg->private); + struct { + struct type6_hdr hdr; + struct ep11_cprb cprbx; + unsigned char pld_tag; /* fixed value 0x30 */ + unsigned char pld_lenfmt; /* payload length format */ + } __packed * msg = ap_msg->message; + struct pld_hdr { + unsigned char func_tag; /* fixed value 0x4 */ + unsigned char func_len; /* fixed value 0x4 */ + unsigned int func_val; /* function ID */ + unsigned char dom_tag; /* fixed value 0x4 */ + unsigned char dom_len; /* fixed value 0x4 */ + unsigned int dom_val; /* domain id */ + } __packed * payload_hdr = NULL; + + + /** + * The target domain field within the cprb body/payload block will be + * replaced by the usage domain for non-management commands only. + * Therefore we check the first bit of the 'flags' parameter for + * management command indication. + * 0 - non management command + * 1 - management command + */ + if (!((msg->cprbx.flags & 0x80) == 0x80)) { + msg->cprbx.target_id = (unsigned int) + AP_QID_QUEUE(zq->queue->qid); + + if ((msg->pld_lenfmt & 0x80) == 0x80) { /*ext.len.fmt 2 or 3*/ + switch (msg->pld_lenfmt & 0x03) { + case 1: + lfmt = 2; + break; + case 2: + lfmt = 3; + break; + default: + return -EINVAL; + } + } else { + lfmt = 1; /* length format #1 */ + } + payload_hdr = (struct pld_hdr *)((&(msg->pld_lenfmt))+lfmt); + payload_hdr->dom_val = (unsigned int) + AP_QID_QUEUE(zq->queue->qid); + } + + init_completion(&rtype->work); + ap_queue_message(zq->queue, ap_msg); + rc = wait_for_completion_interruptible(&rtype->work); + if (rc == 0) { + rc = ap_msg->rc; + if (rc == 0) + rc = convert_response_ep11_xcrb(zq, ap_msg, xcrb); + } else + /* Signal pending. */ + ap_cancel_message(zq->queue, ap_msg); + + return rc; +} + +unsigned int get_rng_fc(struct ap_message *ap_msg, int *func_code, + unsigned int *domain) +{ + struct response_type resp_type = { + .type = PCIXCC_RESPONSE_TYPE_XCRB, + }; + + ap_msg->message = kmalloc(MSGTYPE06_MAX_MSG_SIZE, GFP_KERNEL); + if (!ap_msg->message) + return -ENOMEM; + ap_msg->receive = zcrypt_msgtype6_receive; + ap_msg->psmid = (((unsigned long long) current->pid) << 32) + + atomic_inc_return(&zcrypt_step); + ap_msg->private = kmalloc(sizeof(resp_type), GFP_KERNEL); + if (!ap_msg->private) + return -ENOMEM; + memcpy(ap_msg->private, &resp_type, sizeof(resp_type)); + + rng_type6CPRB_msgX(ap_msg, ZCRYPT_RNG_BUFFER_SIZE, domain); + + *func_code = HWRNG; + return 0; +} + +/** + * The request distributor calls this function if it picked the PCIXCC/CEX2C + * device to generate random data. + * @zq: pointer to zcrypt_queue structure that identifies the + * PCIXCC/CEX2C device to the request distributor + * @buffer: pointer to a memory page to return random data + */ +static long zcrypt_msgtype6_rng(struct zcrypt_queue *zq, + char *buffer, struct ap_message *ap_msg) +{ + struct { + struct type6_hdr hdr; + struct CPRBX cprbx; + char function_code[2]; + short int rule_length; + char rule[8]; + short int verb_length; + short int key_length; + } __packed * msg = ap_msg->message; + struct response_type *rtype = (struct response_type *)(ap_msg->private); + int rc; + + msg->cprbx.domain = AP_QID_QUEUE(zq->queue->qid); + + init_completion(&rtype->work); + ap_queue_message(zq->queue, ap_msg); + rc = wait_for_completion_interruptible(&rtype->work); + if (rc == 0) { + rc = ap_msg->rc; + if (rc == 0) + rc = convert_response_rng(zq, ap_msg, buffer); + } else + /* Signal pending. */ + ap_cancel_message(zq->queue, ap_msg); + + return rc; +} + +/** + * The crypto operations for a PCIXCC/CEX2C card. + */ +static struct zcrypt_ops zcrypt_msgtype6_norng_ops = { + .owner = THIS_MODULE, + .name = MSGTYPE06_NAME, + .variant = MSGTYPE06_VARIANT_NORNG, + .rsa_modexpo = zcrypt_msgtype6_modexpo, + .rsa_modexpo_crt = zcrypt_msgtype6_modexpo_crt, + .send_cprb = zcrypt_msgtype6_send_cprb, +}; + +static struct zcrypt_ops zcrypt_msgtype6_ops = { + .owner = THIS_MODULE, + .name = MSGTYPE06_NAME, + .variant = MSGTYPE06_VARIANT_DEFAULT, + .rsa_modexpo = zcrypt_msgtype6_modexpo, + .rsa_modexpo_crt = zcrypt_msgtype6_modexpo_crt, + .send_cprb = zcrypt_msgtype6_send_cprb, + .rng = zcrypt_msgtype6_rng, +}; + +static struct zcrypt_ops zcrypt_msgtype6_ep11_ops = { + .owner = THIS_MODULE, + .name = MSGTYPE06_NAME, + .variant = MSGTYPE06_VARIANT_EP11, + .rsa_modexpo = NULL, + .rsa_modexpo_crt = NULL, + .send_ep11_cprb = zcrypt_msgtype6_send_ep11_cprb, +}; + +void __init zcrypt_msgtype6_init(void) +{ + zcrypt_msgtype_register(&zcrypt_msgtype6_norng_ops); + zcrypt_msgtype_register(&zcrypt_msgtype6_ops); + zcrypt_msgtype_register(&zcrypt_msgtype6_ep11_ops); +} + +void __exit zcrypt_msgtype6_exit(void) +{ + zcrypt_msgtype_unregister(&zcrypt_msgtype6_norng_ops); + zcrypt_msgtype_unregister(&zcrypt_msgtype6_ops); + zcrypt_msgtype_unregister(&zcrypt_msgtype6_ep11_ops); +} diff --git a/drivers/s390/crypto/zcrypt_msgtype6.h b/drivers/s390/crypto/zcrypt_msgtype6.h new file mode 100644 index 000000000..e4c2f37d7 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_msgtype6.h @@ -0,0 +1,171 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * MSGTYPE restruct: Holger Dengler + */ + +#ifndef _ZCRYPT_MSGTYPE6_H_ +#define _ZCRYPT_MSGTYPE6_H_ + +#include + +#define MSGTYPE06_NAME "zcrypt_msgtype6" +#define MSGTYPE06_VARIANT_DEFAULT 0 +#define MSGTYPE06_VARIANT_NORNG 1 +#define MSGTYPE06_VARIANT_EP11 2 + +#define MSGTYPE06_MAX_MSG_SIZE (12*1024) + +/** + * The type 6 message family is associated with PCICC or PCIXCC cards. + * + * It contains a message header followed by a CPRB, both of which + * are described below. + * + * Note that all reserved fields must be zeroes. + */ +struct type6_hdr { + unsigned char reserved1; /* 0x00 */ + unsigned char type; /* 0x06 */ + unsigned char reserved2[2]; /* 0x0000 */ + unsigned char right[4]; /* 0x00000000 */ + unsigned char reserved3[2]; /* 0x0000 */ + unsigned char reserved4[2]; /* 0x0000 */ + unsigned char apfs[4]; /* 0x00000000 */ + unsigned int offset1; /* 0x00000058 (offset to CPRB) */ + unsigned int offset2; /* 0x00000000 */ + unsigned int offset3; /* 0x00000000 */ + unsigned int offset4; /* 0x00000000 */ + unsigned char agent_id[16]; /* PCICC: */ + /* 0x0100 */ + /* 0x4343412d4150504c202020 */ + /* 0x010101 */ + /* PCIXCC: */ + /* 0x4341000000000000 */ + /* 0x0000000000000000 */ + unsigned char rqid[2]; /* rqid. internal to 603 */ + unsigned char reserved5[2]; /* 0x0000 */ + unsigned char function_code[2]; /* for PKD, 0x5044 (ascii 'PD') */ + unsigned char reserved6[2]; /* 0x0000 */ + unsigned int ToCardLen1; /* (request CPRB len + 3) & -4 */ + unsigned int ToCardLen2; /* db len 0x00000000 for PKD */ + unsigned int ToCardLen3; /* 0x00000000 */ + unsigned int ToCardLen4; /* 0x00000000 */ + unsigned int FromCardLen1; /* response buffer length */ + unsigned int FromCardLen2; /* db len 0x00000000 for PKD */ + unsigned int FromCardLen3; /* 0x00000000 */ + unsigned int FromCardLen4; /* 0x00000000 */ +} __packed; + +/** + * The type 86 message family is associated with PCICC and PCIXCC cards. + * + * It contains a message header followed by a CPRB. The CPRB is + * the same as the request CPRB, which is described above. + * + * If format is 1, an error condition exists and no data beyond + * the 8-byte message header is of interest. + * + * The non-error message is shown below. + * + * Note that all reserved fields must be zeroes. + */ +struct type86_hdr { + unsigned char reserved1; /* 0x00 */ + unsigned char type; /* 0x86 */ + unsigned char format; /* 0x01 (error) or 0x02 (ok) */ + unsigned char reserved2; /* 0x00 */ + unsigned char reply_code; /* reply code (see above) */ + unsigned char reserved3[3]; /* 0x000000 */ +} __packed; + +#define TYPE86_RSP_CODE 0x86 +#define TYPE87_RSP_CODE 0x87 +#define TYPE86_FMT2 0x02 + +struct type86_fmt2_ext { + unsigned char reserved[4]; /* 0x00000000 */ + unsigned char apfs[4]; /* final status */ + unsigned int count1; /* length of CPRB + parameters */ + unsigned int offset1; /* offset to CPRB */ + unsigned int count2; /* 0x00000000 */ + unsigned int offset2; /* db offset 0x00000000 for PKD */ + unsigned int count3; /* 0x00000000 */ + unsigned int offset3; /* 0x00000000 */ + unsigned int count4; /* 0x00000000 */ + unsigned int offset4; /* 0x00000000 */ +} __packed; + +unsigned int get_cprb_fc(struct ica_xcRB *, struct ap_message *, + unsigned int *, unsigned short **); +unsigned int get_ep11cprb_fc(struct ep11_urb *, struct ap_message *, + unsigned int *); +unsigned int get_rng_fc(struct ap_message *, int *, unsigned int *); + +#define LOW 10 +#define MEDIUM 100 +#define HIGH 500 + +int speed_idx_cca(int); +int speed_idx_ep11(int); + +/** + * Prepare a type6 CPRB message for random number generation + * + * @ap_dev: AP device pointer + * @ap_msg: pointer to AP message + */ +static inline void rng_type6CPRB_msgX(struct ap_message *ap_msg, + unsigned int random_number_length, + unsigned int *domain) +{ + struct { + struct type6_hdr hdr; + struct CPRBX cprbx; + char function_code[2]; + short int rule_length; + char rule[8]; + short int verb_length; + short int key_length; + } __packed * msg = ap_msg->message; + static struct type6_hdr static_type6_hdrX = { + .type = 0x06, + .offset1 = 0x00000058, + .agent_id = {'C', 'A'}, + .function_code = {'R', 'L'}, + .ToCardLen1 = sizeof(*msg) - sizeof(msg->hdr), + .FromCardLen1 = sizeof(*msg) - sizeof(msg->hdr), + }; + static struct CPRBX local_cprbx = { + .cprb_len = 0x00dc, + .cprb_ver_id = 0x02, + .func_id = {0x54, 0x32}, + .req_parml = sizeof(*msg) - sizeof(msg->hdr) - + sizeof(msg->cprbx), + .rpl_msgbl = sizeof(*msg) - sizeof(msg->hdr), + }; + + msg->hdr = static_type6_hdrX; + msg->hdr.FromCardLen2 = random_number_length, + msg->cprbx = local_cprbx; + msg->cprbx.rpl_datal = random_number_length, + memcpy(msg->function_code, msg->hdr.function_code, 0x02); + msg->rule_length = 0x0a; + memcpy(msg->rule, "RANDOM ", 8); + msg->verb_length = 0x02; + msg->key_length = 0x02; + ap_msg->length = sizeof(*msg); + *domain = (unsigned short)msg->cprbx.domain; +} + +void zcrypt_msgtype6_init(void); +void zcrypt_msgtype6_exit(void); + +#endif /* _ZCRYPT_MSGTYPE6_H_ */ diff --git a/drivers/s390/crypto/zcrypt_pcixcc.c b/drivers/s390/crypto/zcrypt_pcixcc.c new file mode 100644 index 000000000..baa683c3f --- /dev/null +++ b/drivers/s390/crypto/zcrypt_pcixcc.c @@ -0,0 +1,316 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * Ralph Wuerthner + * MSGTYPE restruct: Holger Dengler + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "ap_bus.h" +#include "zcrypt_api.h" +#include "zcrypt_error.h" +#include "zcrypt_msgtype6.h" +#include "zcrypt_pcixcc.h" +#include "zcrypt_cca_key.h" + +#define PCIXCC_MIN_MOD_SIZE 16 /* 128 bits */ +#define PCIXCC_MIN_MOD_SIZE_OLD 64 /* 512 bits */ +#define PCIXCC_MAX_MOD_SIZE 256 /* 2048 bits */ +#define CEX3C_MIN_MOD_SIZE PCIXCC_MIN_MOD_SIZE +#define CEX3C_MAX_MOD_SIZE 512 /* 4096 bits */ + +#define PCIXCC_MAX_ICA_MESSAGE_SIZE 0x77c /* max size type6 v2 crt message */ +#define PCIXCC_MAX_ICA_RESPONSE_SIZE 0x77c /* max size type86 v2 reply */ + +#define PCIXCC_MAX_XCRB_MESSAGE_SIZE (12*1024) + +#define PCIXCC_CLEANUP_TIME (15*HZ) + +#define CEIL4(x) ((((x)+3)/4)*4) + +struct response_type { + struct completion work; + int type; +}; +#define PCIXCC_RESPONSE_TYPE_ICA 0 +#define PCIXCC_RESPONSE_TYPE_XCRB 1 + +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("PCIXCC Cryptographic Coprocessor device driver, " \ + "Copyright IBM Corp. 2001, 2012"); +MODULE_LICENSE("GPL"); + +static struct ap_device_id zcrypt_pcixcc_card_ids[] = { + { .dev_type = AP_DEVICE_TYPE_PCIXCC, + .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX2C, + .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX3C, + .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE }, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ap, zcrypt_pcixcc_card_ids); + +static struct ap_device_id zcrypt_pcixcc_queue_ids[] = { + { .dev_type = AP_DEVICE_TYPE_PCIXCC, + .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX2C, + .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, + { .dev_type = AP_DEVICE_TYPE_CEX3C, + .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE }, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ap, zcrypt_pcixcc_queue_ids); + +/** + * Large random number detection function. Its sends a message to a pcixcc + * card to find out if large random numbers are supported. + * @ap_dev: pointer to the AP device. + * + * Returns 1 if large random numbers are supported, 0 if not and < 0 on error. + */ +static int zcrypt_pcixcc_rng_supported(struct ap_queue *aq) +{ + struct ap_message ap_msg; + unsigned long long psmid; + unsigned int domain; + struct { + struct type86_hdr hdr; + struct type86_fmt2_ext fmt2; + struct CPRBX cprbx; + } __packed *reply; + struct { + struct type6_hdr hdr; + struct CPRBX cprbx; + char function_code[2]; + short int rule_length; + char rule[8]; + short int verb_length; + short int key_length; + } __packed *msg; + int rc, i; + + ap_init_message(&ap_msg); + ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL); + if (!ap_msg.message) + return -ENOMEM; + + rng_type6CPRB_msgX(&ap_msg, 4, &domain); + + msg = ap_msg.message; + msg->cprbx.domain = AP_QID_QUEUE(aq->qid); + + rc = ap_send(aq->qid, 0x0102030405060708ULL, ap_msg.message, + ap_msg.length); + if (rc) + goto out_free; + + /* Wait for the test message to complete. */ + for (i = 0; i < 2 * HZ; i++) { + msleep(1000 / HZ); + rc = ap_recv(aq->qid, &psmid, ap_msg.message, 4096); + if (rc == 0 && psmid == 0x0102030405060708ULL) + break; + } + + if (i >= 2 * HZ) { + /* Got no answer. */ + rc = -ENODEV; + goto out_free; + } + + reply = ap_msg.message; + if (reply->cprbx.ccp_rtcode == 0 && reply->cprbx.ccp_rscode == 0) + rc = 1; + else + rc = 0; +out_free: + free_page((unsigned long) ap_msg.message); + return rc; +} + +/** + * Probe function for PCIXCC/CEX2C card devices. It always accepts the + * AP device since the bus_match already checked the hardware type. The + * PCIXCC cards come in two flavours: micro code level 2 and micro code + * level 3. This is checked by sending a test message to the device. + * @ap_dev: pointer to the AP card device. + */ +static int zcrypt_pcixcc_card_probe(struct ap_device *ap_dev) +{ + /* + * Normalized speed ratings per crypto adapter + * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY + */ + static const int CEX2C_SPEED_IDX[] = { + 1000, 1400, 2400, 1100, 1500, 2600, 100, 12}; + static const int CEX3C_SPEED_IDX[] = { + 500, 700, 1400, 550, 800, 1500, 80, 10}; + + struct ap_card *ac = to_ap_card(&ap_dev->device); + struct zcrypt_card *zc; + int rc = 0; + + zc = zcrypt_card_alloc(); + if (!zc) + return -ENOMEM; + zc->card = ac; + ac->private = zc; + switch (ac->ap_dev.device_type) { + case AP_DEVICE_TYPE_CEX2C: + zc->user_space_type = ZCRYPT_CEX2C; + zc->type_string = "CEX2C"; + memcpy(zc->speed_rating, CEX2C_SPEED_IDX, + sizeof(CEX2C_SPEED_IDX)); + zc->min_mod_size = PCIXCC_MIN_MOD_SIZE; + zc->max_mod_size = PCIXCC_MAX_MOD_SIZE; + zc->max_exp_bit_length = PCIXCC_MAX_MOD_SIZE; + break; + case AP_DEVICE_TYPE_CEX3C: + zc->user_space_type = ZCRYPT_CEX3C; + zc->type_string = "CEX3C"; + memcpy(zc->speed_rating, CEX3C_SPEED_IDX, + sizeof(CEX3C_SPEED_IDX)); + zc->min_mod_size = CEX3C_MIN_MOD_SIZE; + zc->max_mod_size = CEX3C_MAX_MOD_SIZE; + zc->max_exp_bit_length = CEX3C_MAX_MOD_SIZE; + break; + default: + zcrypt_card_free(zc); + return -ENODEV; + } + zc->online = 1; + + rc = zcrypt_card_register(zc); + if (rc) { + ac->private = NULL; + zcrypt_card_free(zc); + } + + return rc; +} + +/** + * This is called to remove the PCIXCC/CEX2C card driver information + * if an AP card device is removed. + */ +static void zcrypt_pcixcc_card_remove(struct ap_device *ap_dev) +{ + struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private; + + if (zc) + zcrypt_card_unregister(zc); +} + +static struct ap_driver zcrypt_pcixcc_card_driver = { + .probe = zcrypt_pcixcc_card_probe, + .remove = zcrypt_pcixcc_card_remove, + .ids = zcrypt_pcixcc_card_ids, + .flags = AP_DRIVER_FLAG_DEFAULT, +}; + +/** + * Probe function for PCIXCC/CEX2C queue devices. It always accepts the + * AP device since the bus_match already checked the hardware type. The + * PCIXCC cards come in two flavours: micro code level 2 and micro code + * level 3. This is checked by sending a test message to the device. + * @ap_dev: pointer to the AP card device. + */ +static int zcrypt_pcixcc_queue_probe(struct ap_device *ap_dev) +{ + struct ap_queue *aq = to_ap_queue(&ap_dev->device); + struct zcrypt_queue *zq; + int rc; + + zq = zcrypt_queue_alloc(PCIXCC_MAX_XCRB_MESSAGE_SIZE); + if (!zq) + return -ENOMEM; + zq->queue = aq; + zq->online = 1; + atomic_set(&zq->load, 0); + rc = zcrypt_pcixcc_rng_supported(aq); + if (rc < 0) { + zcrypt_queue_free(zq); + return rc; + } + if (rc) + zq->ops = zcrypt_msgtype(MSGTYPE06_NAME, + MSGTYPE06_VARIANT_DEFAULT); + else + zq->ops = zcrypt_msgtype(MSGTYPE06_NAME, + MSGTYPE06_VARIANT_NORNG); + ap_queue_init_reply(aq, &zq->reply); + aq->request_timeout = PCIXCC_CLEANUP_TIME, + aq->private = zq; + rc = zcrypt_queue_register(zq); + if (rc) { + aq->private = NULL; + zcrypt_queue_free(zq); + } + return rc; +} + +/** + * This is called to remove the PCIXCC/CEX2C queue driver information + * if an AP queue device is removed. + */ +static void zcrypt_pcixcc_queue_remove(struct ap_device *ap_dev) +{ + struct ap_queue *aq = to_ap_queue(&ap_dev->device); + struct zcrypt_queue *zq = aq->private; + + if (zq) + zcrypt_queue_unregister(zq); +} + +static struct ap_driver zcrypt_pcixcc_queue_driver = { + .probe = zcrypt_pcixcc_queue_probe, + .remove = zcrypt_pcixcc_queue_remove, + .suspend = ap_queue_suspend, + .resume = ap_queue_resume, + .ids = zcrypt_pcixcc_queue_ids, + .flags = AP_DRIVER_FLAG_DEFAULT, +}; + +int __init zcrypt_pcixcc_init(void) +{ + int rc; + + rc = ap_driver_register(&zcrypt_pcixcc_card_driver, + THIS_MODULE, "pcixcccard"); + if (rc) + return rc; + + rc = ap_driver_register(&zcrypt_pcixcc_queue_driver, + THIS_MODULE, "pcixccqueue"); + if (rc) + ap_driver_unregister(&zcrypt_pcixcc_card_driver); + + return rc; +} + +void zcrypt_pcixcc_exit(void) +{ + ap_driver_unregister(&zcrypt_pcixcc_queue_driver); + ap_driver_unregister(&zcrypt_pcixcc_card_driver); +} + +module_init(zcrypt_pcixcc_init); +module_exit(zcrypt_pcixcc_exit); diff --git a/drivers/s390/crypto/zcrypt_pcixcc.h b/drivers/s390/crypto/zcrypt_pcixcc.h new file mode 100644 index 000000000..cf73a0f91 --- /dev/null +++ b/drivers/s390/crypto/zcrypt_pcixcc.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * MSGTYPE restruct: Holger Dengler + */ + +#ifndef _ZCRYPT_PCIXCC_H_ +#define _ZCRYPT_PCIXCC_H_ + +int zcrypt_pcixcc_init(void); +void zcrypt_pcixcc_exit(void); + +#endif /* _ZCRYPT_PCIXCC_H_ */ diff --git a/drivers/s390/crypto/zcrypt_queue.c b/drivers/s390/crypto/zcrypt_queue.c new file mode 100644 index 000000000..8df82c6ef --- /dev/null +++ b/drivers/s390/crypto/zcrypt_queue.c @@ -0,0 +1,228 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * zcrypt 2.1.0 + * + * Copyright IBM Corp. 2001, 2012 + * Author(s): Robert Burroughs + * Eric Rossman (edrossma@us.ibm.com) + * Cornelia Huck + * + * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) + * Major cleanup & driver split: Martin Schwidefsky + * Ralph Wuerthner + * MSGTYPE restruct: Holger Dengler + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "zcrypt_debug.h" +#include "zcrypt_api.h" + +#include "zcrypt_msgtype6.h" +#include "zcrypt_msgtype50.h" + +/* + * Device attributes common for all crypto queue devices. + */ + +static ssize_t online_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct zcrypt_queue *zq = to_ap_queue(dev)->private; + + return snprintf(buf, PAGE_SIZE, "%d\n", zq->online); +} + +static ssize_t online_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct zcrypt_queue *zq = to_ap_queue(dev)->private; + struct zcrypt_card *zc = zq->zcard; + int online; + + if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1) + return -EINVAL; + + if (online && !zc->online) + return -EINVAL; + zq->online = online; + + ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + online); + + if (!online) + ap_flush_queue(zq->queue); + return count; +} + +static DEVICE_ATTR_RW(online); + +static ssize_t load_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct zcrypt_queue *zq = to_ap_queue(dev)->private; + + return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load)); +} + +static DEVICE_ATTR_RO(load); + +static struct attribute *zcrypt_queue_attrs[] = { + &dev_attr_online.attr, + &dev_attr_load.attr, + NULL, +}; + +static const struct attribute_group zcrypt_queue_attr_group = { + .attrs = zcrypt_queue_attrs, +}; + +void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online) +{ + zq->online = online; + if (!online) + ap_flush_queue(zq->queue); +} + +struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size) +{ + struct zcrypt_queue *zq; + + zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL); + if (!zq) + return NULL; + zq->reply.message = kmalloc(max_response_size, GFP_KERNEL); + if (!zq->reply.message) + goto out_free; + zq->reply.length = max_response_size; + INIT_LIST_HEAD(&zq->list); + kref_init(&zq->refcount); + return zq; + +out_free: + kfree(zq); + return NULL; +} +EXPORT_SYMBOL(zcrypt_queue_alloc); + +void zcrypt_queue_free(struct zcrypt_queue *zq) +{ + kfree(zq->reply.message); + kfree(zq); +} +EXPORT_SYMBOL(zcrypt_queue_free); + +static void zcrypt_queue_release(struct kref *kref) +{ + struct zcrypt_queue *zq = + container_of(kref, struct zcrypt_queue, refcount); + zcrypt_queue_free(zq); +} + +void zcrypt_queue_get(struct zcrypt_queue *zq) +{ + kref_get(&zq->refcount); +} +EXPORT_SYMBOL(zcrypt_queue_get); + +int zcrypt_queue_put(struct zcrypt_queue *zq) +{ + return kref_put(&zq->refcount, zcrypt_queue_release); +} +EXPORT_SYMBOL(zcrypt_queue_put); + +/** + * zcrypt_queue_register() - Register a crypto queue device. + * @zq: Pointer to a crypto queue device + * + * Register a crypto queue device. Returns 0 if successful. + */ +int zcrypt_queue_register(struct zcrypt_queue *zq) +{ + struct zcrypt_card *zc; + int rc; + + spin_lock(&zcrypt_list_lock); + zc = zq->queue->card->private; + zcrypt_card_get(zc); + zq->zcard = zc; + zq->online = 1; /* New devices are online by default. */ + + ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n", + AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); + + list_add_tail(&zq->list, &zc->zqueues); + zcrypt_device_count++; + spin_unlock(&zcrypt_list_lock); + + rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj, + &zcrypt_queue_attr_group); + if (rc) + goto out; + get_device(&zq->queue->ap_dev.device); + + if (zq->ops->rng) { + rc = zcrypt_rng_device_add(); + if (rc) + goto out_unregister; + } + return 0; + +out_unregister: + sysfs_remove_group(&zq->queue->ap_dev.device.kobj, + &zcrypt_queue_attr_group); + put_device(&zq->queue->ap_dev.device); +out: + spin_lock(&zcrypt_list_lock); + list_del_init(&zq->list); + spin_unlock(&zcrypt_list_lock); + zcrypt_card_put(zc); + return rc; +} +EXPORT_SYMBOL(zcrypt_queue_register); + +/** + * zcrypt_queue_unregister(): Unregister a crypto queue device. + * @zq: Pointer to crypto queue device + * + * Unregister a crypto queue device. + */ +void zcrypt_queue_unregister(struct zcrypt_queue *zq) +{ + struct zcrypt_card *zc; + + ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n", + AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid)); + + zc = zq->zcard; + spin_lock(&zcrypt_list_lock); + list_del_init(&zq->list); + zcrypt_device_count--; + spin_unlock(&zcrypt_list_lock); + zcrypt_card_put(zc); + if (zq->ops->rng) + zcrypt_rng_device_remove(); + sysfs_remove_group(&zq->queue->ap_dev.device.kobj, + &zcrypt_queue_attr_group); + put_device(&zq->queue->ap_dev.device); + zcrypt_queue_put(zq); +} +EXPORT_SYMBOL(zcrypt_queue_unregister); diff --git a/drivers/s390/net/Kconfig b/drivers/s390/net/Kconfig new file mode 100644 index 000000000..7c5a25ddf --- /dev/null +++ b/drivers/s390/net/Kconfig @@ -0,0 +1,108 @@ +# SPDX-License-Identifier: GPL-2.0 +menu "S/390 network device drivers" + depends on NETDEVICES && S390 + +config LCS + def_tristate m + prompt "Lan Channel Station Interface" + depends on CCW && NETDEVICES && (ETHERNET || FDDI) + help + Select this option if you want to use LCS networking on IBM System z. + This device driver supports FDDI (IEEE 802.7) and Ethernet. + To compile as a module, choose M. The module name is lcs. + If you do not know what it is, it's safe to choose Y. + +config CTCM + def_tristate m + prompt "CTC and MPC SNA device support" + depends on CCW && NETDEVICES + help + Select this option if you want to use channel-to-channel + point-to-point networking on IBM System z. + This device driver supports real CTC coupling using ESCON. + It also supports virtual CTCs when running under VM. + This driver also supports channel-to-channel MPC SNA devices. + MPC is an SNA protocol device used by Communication Server for Linux. + To compile as a module, choose M. The module name is ctcm. + To compile into the kernel, choose Y. + If you do not need any channel-to-channel connection, choose N. + +config NETIUCV + def_tristate m + prompt "IUCV network device support (VM only)" + depends on IUCV && NETDEVICES + help + Select this option if you want to use inter-user communication + vehicle networking under VM or VIF. It enables a fast communication + link between VM guests. Using ifconfig a point-to-point connection + can be established to the Linux on IBM System z + running on the other VM guest. To compile as a module, choose M. + The module name is netiucv. If unsure, choose Y. + +config SMSGIUCV + def_tristate m + prompt "IUCV special message support (VM only)" + depends on IUCV + help + Select this option if you want to be able to receive SMSG messages + from other VM guest systems. + +config SMSGIUCV_EVENT + def_tristate m + prompt "Deliver IUCV special messages as uevents (VM only)" + depends on SMSGIUCV + help + Select this option to deliver CP special messages (SMSGs) as + uevents. The driver handles only those special messages that + start with "APP". + + To compile as a module, choose M. The module name is "smsgiucv_app". + +config QETH + def_tristate y + prompt "Gigabit Ethernet device support" + depends on CCW && NETDEVICES && IP_MULTICAST && QDIO && ETHERNET + help + This driver supports the IBM System z OSA Express adapters + in QDIO mode (all media types), HiperSockets interfaces and z/VM + virtual NICs for Guest LAN and VSWITCH. + + For details please refer to the documentation provided by IBM at + + + To compile this driver as a module, choose M. + The module name is qeth. + +config QETH_L2 + def_tristate y + prompt "qeth layer 2 device support" + depends on QETH + help + Select this option to be able to run qeth devices in layer 2 mode. + To compile as a module, choose M. The module name is qeth_l2. + If unsure, choose y. + +config QETH_L3 + def_tristate y + prompt "qeth layer 3 device support" + depends on QETH + help + Select this option to be able to run qeth devices in layer 3 mode. + To compile as a module choose M. The module name is qeth_l3. + If unsure, choose Y. + +config CCWGROUP + tristate + default (LCS || CTCM || QETH) + +config ISM + tristate "Support for ISM vPCI Adapter" + depends on PCI && SMC + default n + help + Select this option if you want to use the Internal Shared Memory + vPCI Adapter. + + To compile as a module choose M. The module name is ism. + If unsure, choose N. +endmenu diff --git a/drivers/s390/net/Makefile b/drivers/s390/net/Makefile new file mode 100644 index 000000000..f2d6bbe57 --- /dev/null +++ b/drivers/s390/net/Makefile @@ -0,0 +1,20 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# S/390 network devices +# + +ctcm-y += ctcm_main.o ctcm_fsms.o ctcm_mpc.o ctcm_sysfs.o ctcm_dbug.o +obj-$(CONFIG_CTCM) += ctcm.o fsm.o +obj-$(CONFIG_NETIUCV) += netiucv.o fsm.o +obj-$(CONFIG_SMSGIUCV) += smsgiucv.o +obj-$(CONFIG_SMSGIUCV_EVENT) += smsgiucv_app.o +obj-$(CONFIG_LCS) += lcs.o +qeth-y += qeth_core_sys.o qeth_core_main.o qeth_core_mpc.o +obj-$(CONFIG_QETH) += qeth.o +qeth_l2-y += qeth_l2_main.o qeth_l2_sys.o +obj-$(CONFIG_QETH_L2) += qeth_l2.o +qeth_l3-y += qeth_l3_main.o qeth_l3_sys.o +obj-$(CONFIG_QETH_L3) += qeth_l3.o + +ism-y := ism_drv.o +obj-$(CONFIG_ISM) += ism.o diff --git a/drivers/s390/net/ctcm_dbug.c b/drivers/s390/net/ctcm_dbug.c new file mode 100644 index 000000000..f7ec51db3 --- /dev/null +++ b/drivers/s390/net/ctcm_dbug.c @@ -0,0 +1,78 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2001, 2007 + * Authors: Peter Tiedemann (ptiedem@de.ibm.com) + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "ctcm_dbug.h" + +/* + * Debug Facility Stuff + */ + +struct ctcm_dbf_info ctcm_dbf[CTCM_DBF_INFOS] = { + [CTCM_DBF_SETUP] = {"ctc_setup", 8, 1, 64, CTC_DBF_INFO, NULL}, + [CTCM_DBF_ERROR] = {"ctc_error", 8, 1, 64, CTC_DBF_ERROR, NULL}, + [CTCM_DBF_TRACE] = {"ctc_trace", 8, 1, 64, CTC_DBF_ERROR, NULL}, + [CTCM_DBF_MPC_SETUP] = {"mpc_setup", 8, 1, 80, CTC_DBF_INFO, NULL}, + [CTCM_DBF_MPC_ERROR] = {"mpc_error", 8, 1, 80, CTC_DBF_ERROR, NULL}, + [CTCM_DBF_MPC_TRACE] = {"mpc_trace", 8, 1, 80, CTC_DBF_ERROR, NULL}, +}; + +void ctcm_unregister_dbf_views(void) +{ + int x; + for (x = 0; x < CTCM_DBF_INFOS; x++) { + debug_unregister(ctcm_dbf[x].id); + ctcm_dbf[x].id = NULL; + } +} + +int ctcm_register_dbf_views(void) +{ + int x; + for (x = 0; x < CTCM_DBF_INFOS; x++) { + /* register the areas */ + ctcm_dbf[x].id = debug_register(ctcm_dbf[x].name, + ctcm_dbf[x].pages, + ctcm_dbf[x].areas, + ctcm_dbf[x].len); + if (ctcm_dbf[x].id == NULL) { + ctcm_unregister_dbf_views(); + return -ENOMEM; + } + + /* register a view */ + debug_register_view(ctcm_dbf[x].id, &debug_hex_ascii_view); + /* set a passing level */ + debug_set_level(ctcm_dbf[x].id, ctcm_dbf[x].level); + } + + return 0; +} + +void ctcm_dbf_longtext(enum ctcm_dbf_names dbf_nix, int level, char *fmt, ...) +{ + char dbf_txt_buf[64]; + va_list args; + + if (!debug_level_enabled(ctcm_dbf[dbf_nix].id, level)) + return; + va_start(args, fmt); + vsnprintf(dbf_txt_buf, sizeof(dbf_txt_buf), fmt, args); + va_end(args); + + debug_text_event(ctcm_dbf[dbf_nix].id, level, dbf_txt_buf); +} + diff --git a/drivers/s390/net/ctcm_dbug.h b/drivers/s390/net/ctcm_dbug.h new file mode 100644 index 000000000..675575ef1 --- /dev/null +++ b/drivers/s390/net/ctcm_dbug.h @@ -0,0 +1,142 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2001, 2007 + * Authors: Peter Tiedemann (ptiedem@de.ibm.com) + * + */ + +#ifndef _CTCM_DBUG_H_ +#define _CTCM_DBUG_H_ + +/* + * Debug Facility stuff + */ + +#include + +#ifdef DEBUG + #define do_debug 1 +#else + #define do_debug 0 +#endif +#ifdef DEBUGCCW + #define do_debug_ccw 1 + #define DEBUGDATA 1 +#else + #define do_debug_ccw 0 +#endif +#ifdef DEBUGDATA + #define do_debug_data 1 +#else + #define do_debug_data 0 +#endif + +/* define dbf debug levels similar to kernel msg levels */ +#define CTC_DBF_ALWAYS 0 /* always print this */ +#define CTC_DBF_EMERG 0 /* system is unusable */ +#define CTC_DBF_ALERT 1 /* action must be taken immediately */ +#define CTC_DBF_CRIT 2 /* critical conditions */ +#define CTC_DBF_ERROR 3 /* error conditions */ +#define CTC_DBF_WARN 4 /* warning conditions */ +#define CTC_DBF_NOTICE 5 /* normal but significant condition */ +#define CTC_DBF_INFO 5 /* informational */ +#define CTC_DBF_DEBUG 6 /* debug-level messages */ + +enum ctcm_dbf_names { + CTCM_DBF_SETUP, + CTCM_DBF_ERROR, + CTCM_DBF_TRACE, + CTCM_DBF_MPC_SETUP, + CTCM_DBF_MPC_ERROR, + CTCM_DBF_MPC_TRACE, + CTCM_DBF_INFOS /* must be last element */ +}; + +struct ctcm_dbf_info { + char name[DEBUG_MAX_NAME_LEN]; + int pages; + int areas; + int len; + int level; + debug_info_t *id; +}; + +extern struct ctcm_dbf_info ctcm_dbf[CTCM_DBF_INFOS]; + +int ctcm_register_dbf_views(void); +void ctcm_unregister_dbf_views(void); +void ctcm_dbf_longtext(enum ctcm_dbf_names dbf_nix, int level, char *text, ...); + +static inline const char *strtail(const char *s, int n) +{ + int l = strlen(s); + return (l > n) ? s + (l - n) : s; +} + +#define CTCM_FUNTAIL strtail((char *)__func__, 16) + +#define CTCM_DBF_TEXT(name, level, text) \ + do { \ + debug_text_event(ctcm_dbf[CTCM_DBF_##name].id, level, text); \ + } while (0) + +#define CTCM_DBF_HEX(name, level, addr, len) \ + do { \ + debug_event(ctcm_dbf[CTCM_DBF_##name].id, \ + level, (void *)(addr), len); \ + } while (0) + +#define CTCM_DBF_TEXT_(name, level, text...) \ + ctcm_dbf_longtext(CTCM_DBF_##name, level, text) + +/* + * cat : one of {setup, mpc_setup, trace, mpc_trace, error, mpc_error}. + * dev : netdevice with valid name field. + * text: any text string. + */ +#define CTCM_DBF_DEV_NAME(cat, dev, text) \ + do { \ + CTCM_DBF_TEXT_(cat, CTC_DBF_INFO, "%s(%s) :- %s", \ + CTCM_FUNTAIL, dev->name, text); \ + } while (0) + +#define MPC_DBF_DEV_NAME(cat, dev, text) \ + do { \ + CTCM_DBF_TEXT_(MPC_##cat, CTC_DBF_INFO, "%s(%s) := %s", \ + CTCM_FUNTAIL, dev->name, text); \ + } while (0) + +#define CTCMY_DBF_DEV_NAME(cat, dev, text) \ + do { \ + if (IS_MPCDEV(dev)) \ + MPC_DBF_DEV_NAME(cat, dev, text); \ + else \ + CTCM_DBF_DEV_NAME(cat, dev, text); \ + } while (0) + +/* + * cat : one of {setup, mpc_setup, trace, mpc_trace, error, mpc_error}. + * dev : netdevice. + * text: any text string. + */ +#define CTCM_DBF_DEV(cat, dev, text) \ + do { \ + CTCM_DBF_TEXT_(cat, CTC_DBF_INFO, "%s(%p) :-: %s", \ + CTCM_FUNTAIL, dev, text); \ + } while (0) + +#define MPC_DBF_DEV(cat, dev, text) \ + do { \ + CTCM_DBF_TEXT_(MPC_##cat, CTC_DBF_INFO, "%s(%p) :=: %s", \ + CTCM_FUNTAIL, dev, text); \ + } while (0) + +#define CTCMY_DBF_DEV(cat, dev, text) \ + do { \ + if (IS_MPCDEV(dev)) \ + MPC_DBF_DEV(cat, dev, text); \ + else \ + CTCM_DBF_DEV(cat, dev, text); \ + } while (0) + +#endif diff --git a/drivers/s390/net/ctcm_fsms.c b/drivers/s390/net/ctcm_fsms.c new file mode 100644 index 000000000..1b4ee570b --- /dev/null +++ b/drivers/s390/net/ctcm_fsms.c @@ -0,0 +1,2300 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2001, 2007 + * Authors: Fritz Elfert (felfert@millenux.com) + * Peter Tiedemann (ptiedem@de.ibm.com) + * MPC additions : + * Belinda Thompson (belindat@us.ibm.com) + * Andy Richter (richtera@us.ibm.com) + */ + +#undef DEBUG +#undef DEBUGDATA +#undef DEBUGCCW + +#define KMSG_COMPONENT "ctcm" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include + +#include "fsm.h" + +#include "ctcm_dbug.h" +#include "ctcm_main.h" +#include "ctcm_fsms.h" + +const char *dev_state_names[] = { + [DEV_STATE_STOPPED] = "Stopped", + [DEV_STATE_STARTWAIT_RXTX] = "StartWait RXTX", + [DEV_STATE_STARTWAIT_RX] = "StartWait RX", + [DEV_STATE_STARTWAIT_TX] = "StartWait TX", + [DEV_STATE_STOPWAIT_RXTX] = "StopWait RXTX", + [DEV_STATE_STOPWAIT_RX] = "StopWait RX", + [DEV_STATE_STOPWAIT_TX] = "StopWait TX", + [DEV_STATE_RUNNING] = "Running", +}; + +const char *dev_event_names[] = { + [DEV_EVENT_START] = "Start", + [DEV_EVENT_STOP] = "Stop", + [DEV_EVENT_RXUP] = "RX up", + [DEV_EVENT_TXUP] = "TX up", + [DEV_EVENT_RXDOWN] = "RX down", + [DEV_EVENT_TXDOWN] = "TX down", + [DEV_EVENT_RESTART] = "Restart", +}; + +const char *ctc_ch_event_names[] = { + [CTC_EVENT_IO_SUCCESS] = "ccw_device success", + [CTC_EVENT_IO_EBUSY] = "ccw_device busy", + [CTC_EVENT_IO_ENODEV] = "ccw_device enodev", + [CTC_EVENT_IO_UNKNOWN] = "ccw_device unknown", + [CTC_EVENT_ATTNBUSY] = "Status ATTN & BUSY", + [CTC_EVENT_ATTN] = "Status ATTN", + [CTC_EVENT_BUSY] = "Status BUSY", + [CTC_EVENT_UC_RCRESET] = "Unit check remote reset", + [CTC_EVENT_UC_RSRESET] = "Unit check remote system reset", + [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout", + [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity", + [CTC_EVENT_UC_HWFAIL] = "Unit check Hardware failure", + [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity", + [CTC_EVENT_UC_ZERO] = "Unit check ZERO", + [CTC_EVENT_UC_UNKNOWN] = "Unit check Unknown", + [CTC_EVENT_SC_UNKNOWN] = "SubChannel check Unknown", + [CTC_EVENT_MC_FAIL] = "Machine check failure", + [CTC_EVENT_MC_GOOD] = "Machine check operational", + [CTC_EVENT_IRQ] = "IRQ normal", + [CTC_EVENT_FINSTAT] = "IRQ final", + [CTC_EVENT_TIMER] = "Timer", + [CTC_EVENT_START] = "Start", + [CTC_EVENT_STOP] = "Stop", + /* + * additional MPC events + */ + [CTC_EVENT_SEND_XID] = "XID Exchange", + [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer", +}; + +const char *ctc_ch_state_names[] = { + [CTC_STATE_IDLE] = "Idle", + [CTC_STATE_STOPPED] = "Stopped", + [CTC_STATE_STARTWAIT] = "StartWait", + [CTC_STATE_STARTRETRY] = "StartRetry", + [CTC_STATE_SETUPWAIT] = "SetupWait", + [CTC_STATE_RXINIT] = "RX init", + [CTC_STATE_TXINIT] = "TX init", + [CTC_STATE_RX] = "RX", + [CTC_STATE_TX] = "TX", + [CTC_STATE_RXIDLE] = "RX idle", + [CTC_STATE_TXIDLE] = "TX idle", + [CTC_STATE_RXERR] = "RX error", + [CTC_STATE_TXERR] = "TX error", + [CTC_STATE_TERM] = "Terminating", + [CTC_STATE_DTERM] = "Restarting", + [CTC_STATE_NOTOP] = "Not operational", + /* + * additional MPC states + */ + [CH_XID0_PENDING] = "Pending XID0 Start", + [CH_XID0_INPROGRESS] = "In XID0 Negotiations ", + [CH_XID7_PENDING] = "Pending XID7 P1 Start", + [CH_XID7_PENDING1] = "Active XID7 P1 Exchange ", + [CH_XID7_PENDING2] = "Pending XID7 P2 Start ", + [CH_XID7_PENDING3] = "Active XID7 P2 Exchange ", + [CH_XID7_PENDING4] = "XID7 Complete - Pending READY ", +}; + +static void ctcm_action_nop(fsm_instance *fi, int event, void *arg); + +/* + * ----- static ctcm actions for channel statemachine ----- + * +*/ +static void chx_txdone(fsm_instance *fi, int event, void *arg); +static void chx_rx(fsm_instance *fi, int event, void *arg); +static void chx_rxidle(fsm_instance *fi, int event, void *arg); +static void chx_firstio(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_start(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg); + +/* + * ----- static ctcmpc actions for ctcmpc channel statemachine ----- + * +*/ +static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg); +static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg); +static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg); +/* shared : +static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_start(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg); +*/ +static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg); +static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *); +static void ctcmpc_chx_resend(fsm_instance *, int, void *); +static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg); + +/** + * Check return code of a preceding ccw_device call, halt_IO etc... + * + * ch : The channel, the error belongs to. + * Returns the error code (!= 0) to inspect. + */ +void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg) +{ + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): %s: %04x\n", + CTCM_FUNTAIL, ch->id, msg, rc); + switch (rc) { + case -EBUSY: + pr_info("%s: The communication peer is busy\n", + ch->id); + fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch); + break; + case -ENODEV: + pr_err("%s: The specified target device is not valid\n", + ch->id); + fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch); + break; + default: + pr_err("An I/O operation resulted in error %04x\n", + rc); + fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch); + } +} + +void ctcm_purge_skb_queue(struct sk_buff_head *q) +{ + struct sk_buff *skb; + + CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__); + + while ((skb = skb_dequeue(q))) { + refcount_dec(&skb->users); + dev_kfree_skb_any(skb); + } +} + +/** + * NOP action for statemachines + */ +static void ctcm_action_nop(fsm_instance *fi, int event, void *arg) +{ +} + +/* + * Actions for channel - statemachines. + */ + +/** + * Normal data has been send. Free the corresponding + * skb (it's in io_queue), reset dev->tbusy and + * revert to idle state. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void chx_txdone(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct sk_buff *skb; + int first = 1; + int i; + unsigned long duration; + unsigned long done_stamp = jiffies; + + CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name); + + duration = done_stamp - ch->prof.send_stamp; + if (duration > ch->prof.tx_time) + ch->prof.tx_time = duration; + + if (ch->irb->scsw.cmd.count != 0) + CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, + "%s(%s): TX not complete, remaining %d bytes", + CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count); + fsm_deltimer(&ch->timer); + while ((skb = skb_dequeue(&ch->io_queue))) { + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; + if (first) { + priv->stats.tx_bytes += 2; + first = 0; + } + refcount_dec(&skb->users); + dev_kfree_skb_irq(skb); + } + spin_lock(&ch->collect_lock); + clear_normalized_cda(&ch->ccw[4]); + if (ch->collect_len > 0) { + int rc; + + if (ctcm_checkalloc_buffer(ch)) { + spin_unlock(&ch->collect_lock); + return; + } + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + if (ch->prof.maxmulti < (ch->collect_len + 2)) + ch->prof.maxmulti = ch->collect_len + 2; + if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) + ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); + *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2; + i = 0; + while ((skb = skb_dequeue(&ch->collect_queue))) { + skb_copy_from_linear_data(skb, + skb_put(ch->trans_skb, skb->len), skb->len); + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; + refcount_dec(&skb->users); + dev_kfree_skb_irq(skb); + i++; + } + ch->collect_len = 0; + spin_unlock(&ch->collect_lock); + ch->ccw[1].count = ch->trans_skb->len; + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + ch->prof.send_stamp = jiffies; + rc = ccw_device_start(ch->cdev, &ch->ccw[0], + (unsigned long)ch, 0xff, 0); + ch->prof.doios_multi++; + if (rc != 0) { + priv->stats.tx_dropped += i; + priv->stats.tx_errors += i; + fsm_deltimer(&ch->timer); + ctcm_ccw_check_rc(ch, rc, "chained TX"); + } + } else { + spin_unlock(&ch->collect_lock); + fsm_newstate(fi, CTC_STATE_TXIDLE); + } + ctcm_clear_busy_do(dev); +} + +/** + * Initial data is sent. + * Notify device statemachine that we are up and + * running. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name); + + fsm_deltimer(&ch->timer); + fsm_newstate(fi, CTC_STATE_TXIDLE); + fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev); +} + +/** + * Got normal data, check for sanity, queue it up, allocate new buffer + * trigger bottom half, and initiate next read. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void chx_rx(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + int len = ch->max_bufsize - ch->irb->scsw.cmd.count; + struct sk_buff *skb = ch->trans_skb; + __u16 block_len = *((__u16 *)skb->data); + int check_len; + int rc; + + fsm_deltimer(&ch->timer); + if (len < 8) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s(%s): got packet with length %d < 8\n", + CTCM_FUNTAIL, dev->name, len); + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + goto again; + } + if (len > ch->max_bufsize) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s(%s): got packet with length %d > %d\n", + CTCM_FUNTAIL, dev->name, len, ch->max_bufsize); + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + goto again; + } + + /* + * VM TCP seems to have a bug sending 2 trailing bytes of garbage. + */ + switch (ch->protocol) { + case CTCM_PROTO_S390: + case CTCM_PROTO_OS390: + check_len = block_len + 2; + break; + default: + check_len = block_len; + break; + } + if ((len < block_len) || (len > check_len)) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s(%s): got block length %d != rx length %d\n", + CTCM_FUNTAIL, dev->name, block_len, len); + if (do_debug) + ctcmpc_dump_skb(skb, 0); + + *((__u16 *)skb->data) = len; + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + goto again; + } + if (block_len > 2) { + *((__u16 *)skb->data) = block_len - 2; + ctcm_unpack_skb(ch, skb); + } + again: + skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(skb); + skb->len = 0; + if (ctcm_checkalloc_buffer(ch)) + return; + ch->ccw[1].count = ch->max_bufsize; + rc = ccw_device_start(ch->cdev, &ch->ccw[0], + (unsigned long)ch, 0xff, 0); + if (rc != 0) + ctcm_ccw_check_rc(ch, rc, "normal RX"); +} + +/** + * Initialize connection by sending a __u16 of value 0. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void chx_firstio(fsm_instance *fi, int event, void *arg) +{ + int rc; + struct channel *ch = arg; + int fsmstate = fsm_getstate(fi); + + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s(%s) : %02x", + CTCM_FUNTAIL, ch->id, fsmstate); + + ch->sense_rc = 0; /* reset unit check report control */ + if (fsmstate == CTC_STATE_TXIDLE) + CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, + "%s(%s): remote side issued READ?, init.\n", + CTCM_FUNTAIL, ch->id); + fsm_deltimer(&ch->timer); + if (ctcm_checkalloc_buffer(ch)) + return; + if ((fsmstate == CTC_STATE_SETUPWAIT) && + (ch->protocol == CTCM_PROTO_OS390)) { + /* OS/390 resp. z/OS */ + if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { + *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, + CTC_EVENT_TIMER, ch); + chx_rxidle(fi, event, arg); + } else { + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + fsm_newstate(fi, CTC_STATE_TXIDLE); + fsm_event(priv->fsm, DEV_EVENT_TXUP, dev); + } + return; + } + /* + * Don't setup a timer for receiving the initial RX frame + * if in compatibility mode, since VM TCP delays the initial + * frame until it has some data to send. + */ + if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) || + (ch->protocol != CTCM_PROTO_S390)) + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + + *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; + ch->ccw[1].count = 2; /* Transfer only length */ + + fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) + ? CTC_STATE_RXINIT : CTC_STATE_TXINIT); + rc = ccw_device_start(ch->cdev, &ch->ccw[0], + (unsigned long)ch, 0xff, 0); + if (rc != 0) { + fsm_deltimer(&ch->timer); + fsm_newstate(fi, CTC_STATE_SETUPWAIT); + ctcm_ccw_check_rc(ch, rc, "init IO"); + } + /* + * If in compatibility mode since we don't setup a timer, we + * also signal RX channel up immediately. This enables us + * to send packets early which in turn usually triggers some + * reply from VM TCP which brings up the RX channel to it's + * final state. + */ + if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) && + (ch->protocol == CTCM_PROTO_S390)) { + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); + } +} + +/** + * Got initial data, check it. If OK, + * notify device statemachine that we are up and + * running. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void chx_rxidle(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + __u16 buflen; + int rc; + + fsm_deltimer(&ch->timer); + buflen = *((__u16 *)ch->trans_skb->data); + CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n", + __func__, dev->name, buflen); + + if (buflen >= CTCM_INITIAL_BLOCKLEN) { + if (ctcm_checkalloc_buffer(ch)) + return; + ch->ccw[1].count = ch->max_bufsize; + fsm_newstate(fi, CTC_STATE_RXIDLE); + rc = ccw_device_start(ch->cdev, &ch->ccw[0], + (unsigned long)ch, 0xff, 0); + if (rc != 0) { + fsm_newstate(fi, CTC_STATE_RXINIT); + ctcm_ccw_check_rc(ch, rc, "initial RX"); + } else + fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); + } else { + CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n", + __func__, dev->name, + buflen, CTCM_INITIAL_BLOCKLEN); + chx_firstio(fi, event, arg); + } +} + +/** + * Set channel into extended mode. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + int rc; + unsigned long saveflags = 0; + int timeout = CTCM_TIME_5_SEC; + + fsm_deltimer(&ch->timer); + if (IS_MPC(ch)) { + timeout = 1500; + CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ch, ch->id); + } + fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch); + fsm_newstate(fi, CTC_STATE_SETUPWAIT); + CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2); + + if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + /* Such conditional locking is undeterministic in + * static view. => ignore sparse warnings here. */ + + rc = ccw_device_start(ch->cdev, &ch->ccw[6], + (unsigned long)ch, 0xff, 0); + if (event == CTC_EVENT_TIMER) /* see above comments */ + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + if (rc != 0) { + fsm_deltimer(&ch->timer); + fsm_newstate(fi, CTC_STATE_STARTWAIT); + ctcm_ccw_check_rc(ch, rc, "set Mode"); + } else + ch->retry = 0; +} + +/** + * Setup channel. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_start(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + unsigned long saveflags; + int rc; + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s", + CTCM_FUNTAIL, ch->id, + (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX"); + + if (ch->trans_skb != NULL) { + clear_normalized_cda(&ch->ccw[1]); + dev_kfree_skb(ch->trans_skb); + ch->trans_skb = NULL; + } + if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { + ch->ccw[1].cmd_code = CCW_CMD_READ; + ch->ccw[1].flags = CCW_FLAG_SLI; + ch->ccw[1].count = 0; + } else { + ch->ccw[1].cmd_code = CCW_CMD_WRITE; + ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[1].count = 0; + } + if (ctcm_checkalloc_buffer(ch)) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, + "%s(%s): %s trans_skb alloc delayed " + "until first transfer", + CTCM_FUNTAIL, ch->id, + (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? + "RX" : "TX"); + } + ch->ccw[0].cmd_code = CCW_CMD_PREPARE; + ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[0].count = 0; + ch->ccw[0].cda = 0; + ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */ + ch->ccw[2].flags = CCW_FLAG_SLI; + ch->ccw[2].count = 0; + ch->ccw[2].cda = 0; + memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3); + ch->ccw[4].cda = 0; + ch->ccw[4].flags &= ~CCW_FLAG_IDA; + + fsm_newstate(fi, CTC_STATE_STARTWAIT); + fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + rc = ccw_device_halt(ch->cdev, (unsigned long)ch); + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + if (rc != 0) { + if (rc != -EBUSY) + fsm_deltimer(&ch->timer); + ctcm_ccw_check_rc(ch, rc, "initial HaltIO"); + } +} + +/** + * Shutdown a channel. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + unsigned long saveflags = 0; + int rc; + int oldstate; + + fsm_deltimer(&ch->timer); + if (IS_MPC(ch)) + fsm_deltimer(&ch->sweep_timer); + + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + + if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + /* Such conditional locking is undeterministic in + * static view. => ignore sparse warnings here. */ + oldstate = fsm_getstate(fi); + fsm_newstate(fi, CTC_STATE_TERM); + rc = ccw_device_halt(ch->cdev, (unsigned long)ch); + + if (event == CTC_EVENT_STOP) + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + /* see remark above about conditional locking */ + + if (rc != 0 && rc != -EBUSY) { + fsm_deltimer(&ch->timer); + if (event != CTC_EVENT_STOP) { + fsm_newstate(fi, oldstate); + ctcm_ccw_check_rc(ch, rc, (char *)__func__); + } + } +} + +/** + * Cleanup helper for chx_fail and chx_stopped + * cleanup channels queue and notify interface statemachine. + * + * fi An instance of a channel statemachine. + * state The next state (depending on caller). + * ch The channel to operate on. + */ +static void ctcm_chx_cleanup(fsm_instance *fi, int state, + struct channel *ch) +{ + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, + "%s(%s): %s[%d]\n", + CTCM_FUNTAIL, dev->name, ch->id, state); + + fsm_deltimer(&ch->timer); + if (IS_MPC(ch)) + fsm_deltimer(&ch->sweep_timer); + + fsm_newstate(fi, state); + if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) { + clear_normalized_cda(&ch->ccw[1]); + dev_kfree_skb_any(ch->trans_skb); + ch->trans_skb = NULL; + } + + ch->th_seg = 0x00; + ch->th_seq_num = 0x00; + if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { + skb_queue_purge(&ch->io_queue); + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); + } else { + ctcm_purge_skb_queue(&ch->io_queue); + if (IS_MPC(ch)) + ctcm_purge_skb_queue(&ch->sweep_queue); + spin_lock(&ch->collect_lock); + ctcm_purge_skb_queue(&ch->collect_queue); + ch->collect_len = 0; + spin_unlock(&ch->collect_lock); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + } +} + +/** + * A channel has successfully been halted. + * Cleanup it's queue and notify interface statemachine. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg) +{ + ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg); +} + +/** + * A stop command from device statemachine arrived and we are in + * not operational mode. Set state to stopped. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg) +{ + fsm_newstate(fi, CTC_STATE_STOPPED); +} + +/** + * A machine check for no path, not operational status or gone device has + * happened. + * Cleanup queue and notify interface statemachine. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg) +{ + ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg); +} + +/** + * Handle error during setup of channel. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + /* + * Special case: Got UC_RCRESET on setmode. + * This means that remote side isn't setup. In this case + * simply retry after some 10 secs... + */ + if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) && + ((event == CTC_EVENT_UC_RCRESET) || + (event == CTC_EVENT_UC_RSRESET))) { + fsm_newstate(fi, CTC_STATE_STARTRETRY); + fsm_deltimer(&ch->timer); + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + if (!IS_MPC(ch) && + (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) { + int rc = ccw_device_halt(ch->cdev, (unsigned long)ch); + if (rc != 0) + ctcm_ccw_check_rc(ch, rc, + "HaltIO in chx_setuperr"); + } + return; + } + + CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, + "%s(%s) : %s error during %s channel setup state=%s\n", + CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event], + (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX", + fsm_getstate_str(fi)); + + if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { + fsm_newstate(fi, CTC_STATE_RXERR); + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); + } else { + fsm_newstate(fi, CTC_STATE_TXERR); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + } +} + +/** + * Restart a channel after an error. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + unsigned long saveflags = 0; + int oldstate; + int rc; + + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s: %s[%d] of %s\n", + CTCM_FUNTAIL, ch->id, event, dev->name); + + fsm_deltimer(&ch->timer); + + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + oldstate = fsm_getstate(fi); + fsm_newstate(fi, CTC_STATE_STARTWAIT); + if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + /* Such conditional locking is a known problem for + * sparse because its undeterministic in static view. + * Warnings should be ignored here. */ + rc = ccw_device_halt(ch->cdev, (unsigned long)ch); + if (event == CTC_EVENT_TIMER) + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + if (rc != 0) { + if (rc != -EBUSY) { + fsm_deltimer(&ch->timer); + fsm_newstate(fi, oldstate); + } + ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart"); + } +} + +/** + * Handle error during RX initial handshake (exchange of + * 0-length block header) + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + if (event == CTC_EVENT_TIMER) { + if (!IS_MPCDEV(dev)) + /* TODO : check if MPC deletes timer somewhere */ + fsm_deltimer(&ch->timer); + if (ch->retry++ < 3) + ctcm_chx_restart(fi, event, arg); + else { + fsm_newstate(fi, CTC_STATE_RXERR); + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); + } + } else { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, + ctc_ch_event_names[event], fsm_getstate_str(fi)); + + dev_warn(&dev->dev, + "Initialization failed with RX/TX init handshake " + "error %s\n", ctc_ch_event_names[event]); + } +} + +/** + * Notify device statemachine if we gave up initialization + * of RX channel. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): RX %s busy, init. fail", + CTCM_FUNTAIL, dev->name, ch->id); + fsm_newstate(fi, CTC_STATE_RXERR); + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); +} + +/** + * Handle RX Unit check remote reset (remote disconnected) + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct channel *ch2; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s: %s: remote disconnect - re-init ...", + CTCM_FUNTAIL, dev->name); + fsm_deltimer(&ch->timer); + /* + * Notify device statemachine + */ + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + + fsm_newstate(fi, CTC_STATE_DTERM); + ch2 = priv->channel[CTCM_WRITE]; + fsm_newstate(ch2->fsm, CTC_STATE_DTERM); + + ccw_device_halt(ch->cdev, (unsigned long)ch); + ccw_device_halt(ch2->cdev, (unsigned long)ch2); +} + +/** + * Handle error during TX channel initialization. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + if (event == CTC_EVENT_TIMER) { + fsm_deltimer(&ch->timer); + if (ch->retry++ < 3) + ctcm_chx_restart(fi, event, arg); + else { + fsm_newstate(fi, CTC_STATE_TXERR); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + } + } else { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, + ctc_ch_event_names[event], fsm_getstate_str(fi)); + + dev_warn(&dev->dev, + "Initialization failed with RX/TX init handshake " + "error %s\n", ctc_ch_event_names[event]); + } +} + +/** + * Handle TX timeout by retrying operation. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct sk_buff *skb; + + CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ch, ch->id); + + fsm_deltimer(&ch->timer); + if (ch->retry++ > 3) { + struct mpc_group *gptr = priv->mpcg; + CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, + "%s: %s: retries exceeded", + CTCM_FUNTAIL, ch->id); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + /* call restart if not MPC or if MPC and mpcg fsm is ready. + use gptr as mpc indicator */ + if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY))) + ctcm_chx_restart(fi, event, arg); + goto done; + } + + CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, + "%s : %s: retry %d", + CTCM_FUNTAIL, ch->id, ch->retry); + skb = skb_peek(&ch->io_queue); + if (skb) { + int rc = 0; + unsigned long saveflags = 0; + clear_normalized_cda(&ch->ccw[4]); + ch->ccw[4].count = skb->len; + if (set_normalized_cda(&ch->ccw[4], skb->data)) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, + "%s: %s: IDAL alloc failed", + CTCM_FUNTAIL, ch->id); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + ctcm_chx_restart(fi, event, arg); + goto done; + } + fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); + if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + /* Such conditional locking is a known problem for + * sparse because its undeterministic in static view. + * Warnings should be ignored here. */ + if (do_debug_ccw) + ctcmpc_dumpit((char *)&ch->ccw[3], + sizeof(struct ccw1) * 3); + + rc = ccw_device_start(ch->cdev, &ch->ccw[3], + (unsigned long)ch, 0xff, 0); + if (event == CTC_EVENT_TIMER) + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), + saveflags); + if (rc != 0) { + fsm_deltimer(&ch->timer); + ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry"); + ctcm_purge_skb_queue(&ch->io_queue); + } + } +done: + return; +} + +/** + * Handle fatal errors during an I/O command. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + int rd = CHANNEL_DIRECTION(ch->flags); + + fsm_deltimer(&ch->timer); + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s: %s: %s unrecoverable channel error", + CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX"); + + if (IS_MPC(ch)) { + priv->stats.tx_dropped++; + priv->stats.tx_errors++; + } + if (rd == CTCM_READ) { + fsm_newstate(fi, CTC_STATE_RXERR); + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); + } else { + fsm_newstate(fi, CTC_STATE_TXERR); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + } +} + +/* + * The ctcm statemachine for a channel. + */ +const fsm_node ch_fsm[] = { + { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop }, + { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start }, + { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop }, + + { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop }, + { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start }, + + { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, + { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr }, + { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode }, + { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail }, + { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio }, + { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx }, + { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc }, + { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx }, + + { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle }, + { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio }, + { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, + { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, + { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart }, + { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped }, + { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart }, + { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, + { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, + { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, + { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone }, + { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry }, + { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry }, + { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry }, + { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, +}; + +int ch_fsm_len = ARRAY_SIZE(ch_fsm); + +/* + * MPC actions for mpc channel statemachine + * handling of MPC protocol requires extra + * statemachine and actions which are prefixed ctcmpc_ . + * The ctc_ch_states and ctc_ch_state_names, + * ctc_ch_events and ctc_ch_event_names share the ctcm definitions + * which are expanded by some elements. + */ + +/* + * Actions for mpc channel statemachine. + */ + +/** + * Normal data has been send. Free the corresponding + * skb (it's in io_queue), reset dev->tbusy and + * revert to idle state. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct sk_buff *skb; + int first = 1; + int i; + __u32 data_space; + unsigned long duration; + struct sk_buff *peekskb; + int rc; + struct th_header *header; + struct pdu *p_header; + unsigned long done_stamp = jiffies; + + CTCM_PR_DEBUG("Enter %s: %s cp:%i\n", + __func__, dev->name, smp_processor_id()); + + duration = done_stamp - ch->prof.send_stamp; + if (duration > ch->prof.tx_time) + ch->prof.tx_time = duration; + + if (ch->irb->scsw.cmd.count != 0) + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, + "%s(%s): TX not complete, remaining %d bytes", + CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count); + fsm_deltimer(&ch->timer); + while ((skb = skb_dequeue(&ch->io_queue))) { + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; + if (first) { + priv->stats.tx_bytes += 2; + first = 0; + } + refcount_dec(&skb->users); + dev_kfree_skb_irq(skb); + } + spin_lock(&ch->collect_lock); + clear_normalized_cda(&ch->ccw[4]); + if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) { + spin_unlock(&ch->collect_lock); + fsm_newstate(fi, CTC_STATE_TXIDLE); + goto done; + } + + if (ctcm_checkalloc_buffer(ch)) { + spin_unlock(&ch->collect_lock); + goto done; + } + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH)) + ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH; + if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) + ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); + i = 0; + p_header = NULL; + data_space = grp->group_max_buflen - TH_HEADER_LENGTH; + + CTCM_PR_DBGDATA("%s: building trans_skb from collect_q" + " data_space:%04x\n", + __func__, data_space); + + while ((skb = skb_dequeue(&ch->collect_queue))) { + skb_put_data(ch->trans_skb, skb->data, skb->len); + p_header = (struct pdu *) + (skb_tail_pointer(ch->trans_skb) - skb->len); + p_header->pdu_flag = 0x00; + if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) + p_header->pdu_flag |= 0x60; + else + p_header->pdu_flag |= 0x20; + + CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", + __func__, ch->trans_skb->len); + CTCM_PR_DBGDATA("%s: pdu header and data for up" + " to 32 bytes sent to vtam\n", __func__); + CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32)); + + ch->collect_len -= skb->len; + data_space -= skb->len; + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len; + refcount_dec(&skb->users); + dev_kfree_skb_any(skb); + peekskb = skb_peek(&ch->collect_queue); + if (peekskb->len > data_space) + break; + i++; + } + /* p_header points to the last one we handled */ + if (p_header) + p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/ + header = kzalloc(TH_HEADER_LENGTH, gfp_type()); + if (!header) { + spin_unlock(&ch->collect_lock); + fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); + goto done; + } + header->th_ch_flag = TH_HAS_PDU; /* Normal data */ + ch->th_seq_num++; + header->th_seq_num = ch->th_seq_num; + + CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" , + __func__, ch->th_seq_num); + + memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header, + TH_HEADER_LENGTH); /* put the TH on the packet */ + + kfree(header); + + CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", + __func__, ch->trans_skb->len); + CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb " + "data to vtam from collect_q\n", __func__); + CTCM_D3_DUMP((char *)ch->trans_skb->data, + min_t(int, ch->trans_skb->len, 50)); + + spin_unlock(&ch->collect_lock); + clear_normalized_cda(&ch->ccw[1]); + + CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n", + (void *)(unsigned long)ch->ccw[1].cda, + ch->trans_skb->data); + ch->ccw[1].count = ch->max_bufsize; + + if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { + dev_kfree_skb_any(ch->trans_skb); + ch->trans_skb = NULL; + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, + "%s: %s: IDAL alloc failed", + CTCM_FUNTAIL, ch->id); + fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); + return; + } + + CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n", + (void *)(unsigned long)ch->ccw[1].cda, + ch->trans_skb->data); + + ch->ccw[1].count = ch->trans_skb->len; + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + ch->prof.send_stamp = jiffies; + if (do_debug_ccw) + ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3); + rc = ccw_device_start(ch->cdev, &ch->ccw[0], + (unsigned long)ch, 0xff, 0); + ch->prof.doios_multi++; + if (rc != 0) { + priv->stats.tx_dropped += i; + priv->stats.tx_errors += i; + fsm_deltimer(&ch->timer); + ctcm_ccw_check_rc(ch, rc, "chained TX"); + } +done: + ctcm_clear_busy(dev); + return; +} + +/** + * Got normal data, check for sanity, queue it up, allocate new buffer + * trigger bottom half, and initiate next read. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct sk_buff *skb = ch->trans_skb; + struct sk_buff *new_skb; + unsigned long saveflags = 0; /* avoids compiler warning */ + int len = ch->max_bufsize - ch->irb->scsw.cmd.count; + + CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n", + CTCM_FUNTAIL, dev->name, smp_processor_id(), + ch->id, ch->max_bufsize, len); + fsm_deltimer(&ch->timer); + + if (skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): TRANS_SKB = NULL", + CTCM_FUNTAIL, dev->name); + goto again; + } + + if (len < TH_HEADER_LENGTH) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): packet length %d to short", + CTCM_FUNTAIL, dev->name, len); + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + } else { + /* must have valid th header or game over */ + __u32 block_len = len; + len = TH_HEADER_LENGTH + XID2_LENGTH + 4; + new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC); + + if (new_skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%d): skb allocation failed", + CTCM_FUNTAIL, dev->name); + fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); + goto again; + } + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_RESET: + case MPCG_STATE_INOP: + dev_kfree_skb_any(new_skb); + break; + case MPCG_STATE_FLOWC: + case MPCG_STATE_READY: + skb_put_data(new_skb, skb->data, block_len); + skb_queue_tail(&ch->io_queue, new_skb); + tasklet_schedule(&ch->ch_tasklet); + break; + default: + skb_put_data(new_skb, skb->data, len); + skb_queue_tail(&ch->io_queue, new_skb); + tasklet_hi_schedule(&ch->ch_tasklet); + break; + } + } + +again: + switch (fsm_getstate(grp->fsm)) { + int rc, dolock; + case MPCG_STATE_FLOWC: + case MPCG_STATE_READY: + if (ctcm_checkalloc_buffer(ch)) + break; + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + ch->ccw[1].count = ch->max_bufsize; + if (do_debug_ccw) + ctcmpc_dumpit((char *)&ch->ccw[0], + sizeof(struct ccw1) * 3); + dolock = !in_irq(); + if (dolock) + spin_lock_irqsave( + get_ccwdev_lock(ch->cdev), saveflags); + rc = ccw_device_start(ch->cdev, &ch->ccw[0], + (unsigned long)ch, 0xff, 0); + if (dolock) /* see remark about conditional locking */ + spin_unlock_irqrestore( + get_ccwdev_lock(ch->cdev), saveflags); + if (rc != 0) + ctcm_ccw_check_rc(ch, rc, "normal RX"); + default: + break; + } + + CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n", + __func__, dev->name, ch, ch->id); + +} + +/** + * Initialize connection by sending a __u16 of value 0. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *gptr = priv->mpcg; + + CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n", + __func__, ch->id, ch); + + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, + "%s: %s: chstate:%i, grpstate:%i, prot:%i\n", + CTCM_FUNTAIL, ch->id, fsm_getstate(fi), + fsm_getstate(gptr->fsm), ch->protocol); + + if (fsm_getstate(fi) == CTC_STATE_TXIDLE) + MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? "); + + fsm_deltimer(&ch->timer); + if (ctcm_checkalloc_buffer(ch)) + goto done; + + switch (fsm_getstate(fi)) { + case CTC_STATE_STARTRETRY: + case CTC_STATE_SETUPWAIT: + if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { + ctcmpc_chx_rxidle(fi, event, arg); + } else { + fsm_newstate(fi, CTC_STATE_TXIDLE); + fsm_event(priv->fsm, DEV_EVENT_TXUP, dev); + } + goto done; + default: + break; + } + + fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) + ? CTC_STATE_RXINIT : CTC_STATE_TXINIT); + +done: + CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n", + __func__, ch->id, ch); + return; +} + +/** + * Got initial data, check it. If OK, + * notify device statemachine that we are up and + * running. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + int rc; + unsigned long saveflags = 0; /* avoids compiler warning */ + + fsm_deltimer(&ch->timer); + CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n", + __func__, ch->id, dev->name, smp_processor_id(), + fsm_getstate(fi), fsm_getstate(grp->fsm)); + + fsm_newstate(fi, CTC_STATE_RXIDLE); + /* XID processing complete */ + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_FLOWC: + case MPCG_STATE_READY: + if (ctcm_checkalloc_buffer(ch)) + goto done; + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + ch->ccw[1].count = ch->max_bufsize; + CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3); + if (event == CTC_EVENT_START) + /* see remark about conditional locking */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + rc = ccw_device_start(ch->cdev, &ch->ccw[0], + (unsigned long)ch, 0xff, 0); + if (event == CTC_EVENT_START) + spin_unlock_irqrestore( + get_ccwdev_lock(ch->cdev), saveflags); + if (rc != 0) { + fsm_newstate(fi, CTC_STATE_RXINIT); + ctcm_ccw_check_rc(ch, rc, "initial RX"); + goto done; + } + break; + default: + break; + } + + fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); +done: + return; +} + +/* + * ctcmpc channel FSM action + * called from several points in ctcmpc_ch_fsm + * ctcmpc only + */ +static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n", + __func__, dev->name, ch->id, ch, smp_processor_id(), + fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm)); + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID2INITW: + /* ok..start yside xid exchanges */ + if (!ch->in_mpcgroup) + break; + if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) { + fsm_deltimer(&grp->timer); + fsm_addtimer(&grp->timer, + MPC_XID_TIMEOUT_VALUE, + MPCG_EVENT_TIMER, dev); + fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); + + } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1) + /* attn rcvd before xid0 processed via bh */ + fsm_newstate(ch->fsm, CH_XID7_PENDING1); + break; + case MPCG_STATE_XID2INITX: + case MPCG_STATE_XID0IOWAIT: + case MPCG_STATE_XID0IOWAIX: + /* attn rcvd before xid0 processed on ch + but mid-xid0 processing for group */ + if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1) + fsm_newstate(ch->fsm, CH_XID7_PENDING1); + break; + case MPCG_STATE_XID7INITW: + case MPCG_STATE_XID7INITX: + case MPCG_STATE_XID7INITI: + case MPCG_STATE_XID7INITZ: + switch (fsm_getstate(ch->fsm)) { + case CH_XID7_PENDING: + fsm_newstate(ch->fsm, CH_XID7_PENDING1); + break; + case CH_XID7_PENDING2: + fsm_newstate(ch->fsm, CH_XID7_PENDING3); + break; + } + fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); + break; + } + + return; +} + +/* + * ctcmpc channel FSM action + * called from one point in ctcmpc_ch_fsm + * ctcmpc only + */ +static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n", + __func__, dev->name, ch->id, + fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm)); + + fsm_deltimer(&ch->timer); + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID0IOWAIT: + /* vtam wants to be primary.start yside xid exchanges*/ + /* only receive one attn-busy at a time so must not */ + /* change state each time */ + grp->changed_side = 1; + fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); + break; + case MPCG_STATE_XID2INITW: + if (grp->changed_side == 1) { + grp->changed_side = 2; + break; + } + /* process began via call to establish_conn */ + /* so must report failure instead of reverting */ + /* back to ready-for-xid passive state */ + if (grp->estconnfunc) + goto done; + /* this attnbusy is NOT the result of xside xid */ + /* collisions so yside must have been triggered */ + /* by an ATTN that was not intended to start XID */ + /* processing. Revert back to ready-for-xid and */ + /* wait for ATTN interrupt to signal xid start */ + if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) { + fsm_newstate(ch->fsm, CH_XID0_PENDING) ; + fsm_deltimer(&grp->timer); + goto done; + } + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + case MPCG_STATE_XID2INITX: + /* XID2 was received before ATTN Busy for second + channel.Send yside xid for second channel. + */ + if (grp->changed_side == 1) { + grp->changed_side = 2; + break; + } + case MPCG_STATE_XID0IOWAIX: + case MPCG_STATE_XID7INITW: + case MPCG_STATE_XID7INITX: + case MPCG_STATE_XID7INITI: + case MPCG_STATE_XID7INITZ: + default: + /* multiple attn-busy indicates too out-of-sync */ + /* and they are certainly not being received as part */ + /* of valid mpc group negotiations.. */ + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + } + + if (grp->changed_side == 1) { + fsm_deltimer(&grp->timer); + fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, + MPCG_EVENT_TIMER, dev); + } + if (ch->in_mpcgroup) + fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); + else + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): channel %s not added to group", + CTCM_FUNTAIL, dev->name, ch->id); + +done: + return; +} + +/* + * ctcmpc channel FSM action + * called from several points in ctcmpc_ch_fsm + * ctcmpc only + */ +static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); + return; +} + +/* + * ctcmpc channel FSM action + * called from several points in ctcmpc_ch_fsm + * ctcmpc only + */ +static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg) +{ + struct channel *ach = arg; + struct net_device *dev = ach->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct channel *wch = priv->channel[CTCM_WRITE]; + struct channel *rch = priv->channel[CTCM_READ]; + struct sk_buff *skb; + struct th_sweep *header; + int rc = 0; + unsigned long saveflags = 0; + + CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ach, ach->id); + + if (grp->in_sweep == 0) + goto done; + + CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" , + __func__, wch->th_seq_num); + CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" , + __func__, rch->th_seq_num); + + if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) { + /* give the previous IO time to complete */ + fsm_addtimer(&wch->sweep_timer, + 200, CTC_EVENT_RSWEEP_TIMER, wch); + goto done; + } + + skb = skb_dequeue(&wch->sweep_queue); + if (!skb) + goto done; + + if (set_normalized_cda(&wch->ccw[4], skb->data)) { + grp->in_sweep = 0; + ctcm_clear_busy_do(dev); + dev_kfree_skb_any(skb); + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + } else { + refcount_inc(&skb->users); + skb_queue_tail(&wch->io_queue, skb); + } + + /* send out the sweep */ + wch->ccw[4].count = skb->len; + + header = (struct th_sweep *)skb->data; + switch (header->th.th_ch_flag) { + case TH_SWEEP_REQ: + grp->sweep_req_pend_num--; + break; + case TH_SWEEP_RESP: + grp->sweep_rsp_pend_num--; + break; + } + + header->sw.th_last_seq = wch->th_seq_num; + + CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3); + CTCM_PR_DBGDATA("%s: sweep packet\n", __func__); + CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH); + + fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch); + fsm_newstate(wch->fsm, CTC_STATE_TX); + + spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags); + wch->prof.send_stamp = jiffies; + rc = ccw_device_start(wch->cdev, &wch->ccw[3], + (unsigned long) wch, 0xff, 0); + spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags); + + if ((grp->sweep_req_pend_num == 0) && + (grp->sweep_rsp_pend_num == 0)) { + grp->in_sweep = 0; + rch->th_seq_num = 0x00; + wch->th_seq_num = 0x00; + ctcm_clear_busy_do(dev); + } + + CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" , + __func__, wch->th_seq_num, rch->th_seq_num); + + if (rc != 0) + ctcm_ccw_check_rc(wch, rc, "send sweep"); + +done: + return; +} + + +/* + * The ctcmpc statemachine for a channel. + */ + +const fsm_node ctcmpc_ch_fsm[] = { + { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop }, + { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start }, + { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop }, + + { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop }, + { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start }, + { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop }, + { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop }, + { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + + { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, + { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr }, + { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode }, + { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, + { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + + { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail }, + { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio }, + { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + + { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy }, + { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc }, + { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, + { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + + { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle }, + { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, + + { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio }, + { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail }, + { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, + { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, + + { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart }, + { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped }, + { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + + { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart }, + { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, + { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, + { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, + { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + + { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone }, + { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail }, + { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, + { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry }, + { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, + { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, +}; + +int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm); + +/* + * Actions for interface - statemachine. + */ + +/** + * Startup channels by sending CTC_EVENT_START to each channel. + * + * fi An instance of an interface statemachine. + * event The event, just happened. + * arg Generic pointer, casted from struct net_device * upon call. + */ +static void dev_action_start(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + int direction; + + CTCMY_DBF_DEV_NAME(SETUP, dev, ""); + + fsm_deltimer(&priv->restart_timer); + fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); + if (IS_MPC(priv)) + priv->mpcg->channels_terminating = 0; + for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { + struct channel *ch = priv->channel[direction]; + fsm_event(ch->fsm, CTC_EVENT_START, ch); + } +} + +/** + * Shutdown channels by sending CTC_EVENT_STOP to each channel. + * + * fi An instance of an interface statemachine. + * event The event, just happened. + * arg Generic pointer, casted from struct net_device * upon call. + */ +static void dev_action_stop(fsm_instance *fi, int event, void *arg) +{ + int direction; + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + + CTCMY_DBF_DEV_NAME(SETUP, dev, ""); + + fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); + for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { + struct channel *ch = priv->channel[direction]; + fsm_event(ch->fsm, CTC_EVENT_STOP, ch); + ch->th_seq_num = 0x00; + CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n", + __func__, ch->th_seq_num); + } + if (IS_MPC(priv)) + fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET); +} + +static void dev_action_restart(fsm_instance *fi, int event, void *arg) +{ + int restart_timer; + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + + CTCMY_DBF_DEV_NAME(TRACE, dev, ""); + + if (IS_MPC(priv)) { + restart_timer = CTCM_TIME_1_SEC; + } else { + restart_timer = CTCM_TIME_5_SEC; + } + dev_info(&dev->dev, "Restarting device\n"); + + dev_action_stop(fi, event, arg); + fsm_event(priv->fsm, DEV_EVENT_STOP, dev); + if (IS_MPC(priv)) + fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET); + + /* going back into start sequence too quickly can */ + /* result in the other side becoming unreachable due */ + /* to sense reported when IO is aborted */ + fsm_addtimer(&priv->restart_timer, restart_timer, + DEV_EVENT_START, dev); +} + +/** + * Called from channel statemachine + * when a channel is up and running. + * + * fi An instance of an interface statemachine. + * event The event, just happened. + * arg Generic pointer, casted from struct net_device * upon call. + */ +static void dev_action_chup(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + int dev_stat = fsm_getstate(fi); + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, + "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL, + dev->name, dev->ml_priv, dev_stat, event); + + switch (fsm_getstate(fi)) { + case DEV_STATE_STARTWAIT_RXTX: + if (event == DEV_EVENT_RXUP) + fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); + else + fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); + break; + case DEV_STATE_STARTWAIT_RX: + if (event == DEV_EVENT_RXUP) { + fsm_newstate(fi, DEV_STATE_RUNNING); + dev_info(&dev->dev, + "Connected with remote side\n"); + ctcm_clear_busy(dev); + } + break; + case DEV_STATE_STARTWAIT_TX: + if (event == DEV_EVENT_TXUP) { + fsm_newstate(fi, DEV_STATE_RUNNING); + dev_info(&dev->dev, + "Connected with remote side\n"); + ctcm_clear_busy(dev); + } + break; + case DEV_STATE_STOPWAIT_TX: + if (event == DEV_EVENT_RXUP) + fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); + break; + case DEV_STATE_STOPWAIT_RX: + if (event == DEV_EVENT_TXUP) + fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); + break; + } + + if (IS_MPC(priv)) { + if (event == DEV_EVENT_RXUP) + mpc_channel_action(priv->channel[CTCM_READ], + CTCM_READ, MPC_CHANNEL_ADD); + else + mpc_channel_action(priv->channel[CTCM_WRITE], + CTCM_WRITE, MPC_CHANNEL_ADD); + } +} + +/** + * Called from device statemachine + * when a channel has been shutdown. + * + * fi An instance of an interface statemachine. + * event The event, just happened. + * arg Generic pointer, casted from struct net_device * upon call. + */ +static void dev_action_chdown(fsm_instance *fi, int event, void *arg) +{ + + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + + CTCMY_DBF_DEV_NAME(SETUP, dev, ""); + + switch (fsm_getstate(fi)) { + case DEV_STATE_RUNNING: + if (event == DEV_EVENT_TXDOWN) + fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); + else + fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); + break; + case DEV_STATE_STARTWAIT_RX: + if (event == DEV_EVENT_TXDOWN) + fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); + break; + case DEV_STATE_STARTWAIT_TX: + if (event == DEV_EVENT_RXDOWN) + fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); + break; + case DEV_STATE_STOPWAIT_RXTX: + if (event == DEV_EVENT_TXDOWN) + fsm_newstate(fi, DEV_STATE_STOPWAIT_RX); + else + fsm_newstate(fi, DEV_STATE_STOPWAIT_TX); + break; + case DEV_STATE_STOPWAIT_RX: + if (event == DEV_EVENT_RXDOWN) + fsm_newstate(fi, DEV_STATE_STOPPED); + break; + case DEV_STATE_STOPWAIT_TX: + if (event == DEV_EVENT_TXDOWN) + fsm_newstate(fi, DEV_STATE_STOPPED); + break; + } + if (IS_MPC(priv)) { + if (event == DEV_EVENT_RXDOWN) + mpc_channel_action(priv->channel[CTCM_READ], + CTCM_READ, MPC_CHANNEL_REMOVE); + else + mpc_channel_action(priv->channel[CTCM_WRITE], + CTCM_WRITE, MPC_CHANNEL_REMOVE); + } +} + +const fsm_node dev_fsm[] = { + { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start }, + { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start }, + { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, + { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, + { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start }, + { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, + { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, + { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown }, + { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start }, + { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, + { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, + { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown }, + { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop }, + { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown }, + { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop }, + { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown }, + { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop }, + { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown }, + { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown }, + { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop }, + { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop }, + { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart }, +}; + +int dev_fsm_len = ARRAY_SIZE(dev_fsm); + +/* --- This is the END my friend --- */ + diff --git a/drivers/s390/net/ctcm_fsms.h b/drivers/s390/net/ctcm_fsms.h new file mode 100644 index 000000000..225737295 --- /dev/null +++ b/drivers/s390/net/ctcm_fsms.h @@ -0,0 +1,357 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2001, 2007 + * Authors: Fritz Elfert (felfert@millenux.com) + * Peter Tiedemann (ptiedem@de.ibm.com) + * MPC additions : + * Belinda Thompson (belindat@us.ibm.com) + * Andy Richter (richtera@us.ibm.com) + */ +#ifndef _CTCM_FSMS_H_ +#define _CTCM_FSMS_H_ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include + +#include "fsm.h" +#include "ctcm_main.h" + +/* + * Definitions for the channel statemachine(s) for ctc and ctcmpc + * + * To allow better kerntyping, prefix-less definitions for channel states + * and channel events have been replaced : + * ch_event... -> ctc_ch_event... + * CH_EVENT... -> CTC_EVENT... + * ch_state... -> ctc_ch_state... + * CH_STATE... -> CTC_STATE... + */ +/* + * Events of the channel statemachine(s) for ctc and ctcmpc + */ +enum ctc_ch_events { + /* + * Events, representing return code of + * I/O operations (ccw_device_start, ccw_device_halt et al.) + */ + CTC_EVENT_IO_SUCCESS, + CTC_EVENT_IO_EBUSY, + CTC_EVENT_IO_ENODEV, + CTC_EVENT_IO_UNKNOWN, + + CTC_EVENT_ATTNBUSY, + CTC_EVENT_ATTN, + CTC_EVENT_BUSY, + /* + * Events, representing unit-check + */ + CTC_EVENT_UC_RCRESET, + CTC_EVENT_UC_RSRESET, + CTC_EVENT_UC_TXTIMEOUT, + CTC_EVENT_UC_TXPARITY, + CTC_EVENT_UC_HWFAIL, + CTC_EVENT_UC_RXPARITY, + CTC_EVENT_UC_ZERO, + CTC_EVENT_UC_UNKNOWN, + /* + * Events, representing subchannel-check + */ + CTC_EVENT_SC_UNKNOWN, + /* + * Events, representing machine checks + */ + CTC_EVENT_MC_FAIL, + CTC_EVENT_MC_GOOD, + /* + * Event, representing normal IRQ + */ + CTC_EVENT_IRQ, + CTC_EVENT_FINSTAT, + /* + * Event, representing timer expiry. + */ + CTC_EVENT_TIMER, + /* + * Events, representing commands from upper levels. + */ + CTC_EVENT_START, + CTC_EVENT_STOP, + CTC_NR_EVENTS, + /* + * additional MPC events + */ + CTC_EVENT_SEND_XID = CTC_NR_EVENTS, + CTC_EVENT_RSWEEP_TIMER, + /* + * MUST be always the last element!! + */ + CTC_MPC_NR_EVENTS, +}; + +/* + * States of the channel statemachine(s) for ctc and ctcmpc. + */ +enum ctc_ch_states { + /* + * Channel not assigned to any device, + * initial state, direction invalid + */ + CTC_STATE_IDLE, + /* + * Channel assigned but not operating + */ + CTC_STATE_STOPPED, + CTC_STATE_STARTWAIT, + CTC_STATE_STARTRETRY, + CTC_STATE_SETUPWAIT, + CTC_STATE_RXINIT, + CTC_STATE_TXINIT, + CTC_STATE_RX, + CTC_STATE_TX, + CTC_STATE_RXIDLE, + CTC_STATE_TXIDLE, + CTC_STATE_RXERR, + CTC_STATE_TXERR, + CTC_STATE_TERM, + CTC_STATE_DTERM, + CTC_STATE_NOTOP, + CTC_NR_STATES, /* MUST be the last element of non-expanded states */ + /* + * additional MPC states + */ + CH_XID0_PENDING = CTC_NR_STATES, + CH_XID0_INPROGRESS, + CH_XID7_PENDING, + CH_XID7_PENDING1, + CH_XID7_PENDING2, + CH_XID7_PENDING3, + CH_XID7_PENDING4, + CTC_MPC_NR_STATES, /* MUST be the last element of expanded mpc states */ +}; + +extern const char *ctc_ch_event_names[]; + +extern const char *ctc_ch_state_names[]; + +void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg); +void ctcm_purge_skb_queue(struct sk_buff_head *q); +void fsm_action_nop(fsm_instance *fi, int event, void *arg); + +/* + * ----- non-static actions for ctcm channel statemachine ----- + * + */ +void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg); + +/* + * ----- FSM (state/event/action) of the ctcm channel statemachine ----- + */ +extern const fsm_node ch_fsm[]; +extern int ch_fsm_len; + + +/* + * ----- non-static actions for ctcmpc channel statemachine ---- + * + */ +/* shared : +void ctcm_chx_txidle(fsm_instance * fi, int event, void *arg); + */ +void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg); + +/* + * ----- FSM (state/event/action) of the ctcmpc channel statemachine ----- + */ +extern const fsm_node ctcmpc_ch_fsm[]; +extern int mpc_ch_fsm_len; + +/* + * Definitions for the device interface statemachine for ctc and mpc + */ + +/* + * States of the device interface statemachine. + */ +enum dev_states { + DEV_STATE_STOPPED, + DEV_STATE_STARTWAIT_RXTX, + DEV_STATE_STARTWAIT_RX, + DEV_STATE_STARTWAIT_TX, + DEV_STATE_STOPWAIT_RXTX, + DEV_STATE_STOPWAIT_RX, + DEV_STATE_STOPWAIT_TX, + DEV_STATE_RUNNING, + /* + * MUST be always the last element!! + */ + CTCM_NR_DEV_STATES +}; + +extern const char *dev_state_names[]; + +/* + * Events of the device interface statemachine. + * ctcm and ctcmpc + */ +enum dev_events { + DEV_EVENT_START, + DEV_EVENT_STOP, + DEV_EVENT_RXUP, + DEV_EVENT_TXUP, + DEV_EVENT_RXDOWN, + DEV_EVENT_TXDOWN, + DEV_EVENT_RESTART, + /* + * MUST be always the last element!! + */ + CTCM_NR_DEV_EVENTS +}; + +extern const char *dev_event_names[]; + +/* + * Actions for the device interface statemachine. + * ctc and ctcmpc + */ +/* +static void dev_action_start(fsm_instance * fi, int event, void *arg); +static void dev_action_stop(fsm_instance * fi, int event, void *arg); +static void dev_action_restart(fsm_instance *fi, int event, void *arg); +static void dev_action_chup(fsm_instance * fi, int event, void *arg); +static void dev_action_chdown(fsm_instance * fi, int event, void *arg); +*/ + +/* + * The (state/event/action) fsm table of the device interface statemachine. + * ctcm and ctcmpc + */ +extern const fsm_node dev_fsm[]; +extern int dev_fsm_len; + + +/* + * Definitions for the MPC Group statemachine + */ + +/* + * MPC Group Station FSM States + +State Name When In This State +====================== ======================================= +MPCG_STATE_RESET Initial State When Driver Loaded + We receive and send NOTHING + +MPCG_STATE_INOP INOP Received. + Group level non-recoverable error + +MPCG_STATE_READY XID exchanges for at least 1 write and + 1 read channel have completed. + Group is ready for data transfer. + +States from ctc_mpc_alloc_channel +============================================================== +MPCG_STATE_XID2INITW Awaiting XID2(0) Initiation + ATTN from other side will start + XID negotiations. + Y-side protocol only. + +MPCG_STATE_XID2INITX XID2(0) negotiations are in progress. + At least 1, but not all, XID2(0)'s + have been received from partner. + +MPCG_STATE_XID7INITW XID2(0) complete + No XID2(7)'s have yet been received. + XID2(7) negotiations pending. + +MPCG_STATE_XID7INITX XID2(7) negotiations in progress. + At least 1, but not all, XID2(7)'s + have been received from partner. + +MPCG_STATE_XID7INITF XID2(7) negotiations complete. + Transitioning to READY. + +MPCG_STATE_READY Ready for Data Transfer. + + +States from ctc_mpc_establish_connectivity call +============================================================== +MPCG_STATE_XID0IOWAIT Initiating XID2(0) negotiations. + X-side protocol only. + ATTN-BUSY from other side will convert + this to Y-side protocol and the + ctc_mpc_alloc_channel flow will begin. + +MPCG_STATE_XID0IOWAIX XID2(0) negotiations are in progress. + At least 1, but not all, XID2(0)'s + have been received from partner. + +MPCG_STATE_XID7INITI XID2(0) complete + No XID2(7)'s have yet been received. + XID2(7) negotiations pending. + +MPCG_STATE_XID7INITZ XID2(7) negotiations in progress. + At least 1, but not all, XID2(7)'s + have been received from partner. + +MPCG_STATE_XID7INITF XID2(7) negotiations complete. + Transitioning to READY. + +MPCG_STATE_READY Ready for Data Transfer. + +*/ + +enum mpcg_events { + MPCG_EVENT_INOP, + MPCG_EVENT_DISCONC, + MPCG_EVENT_XID0DO, + MPCG_EVENT_XID2, + MPCG_EVENT_XID2DONE, + MPCG_EVENT_XID7DONE, + MPCG_EVENT_TIMER, + MPCG_EVENT_DOIO, + MPCG_NR_EVENTS, +}; + +enum mpcg_states { + MPCG_STATE_RESET, + MPCG_STATE_INOP, + MPCG_STATE_XID2INITW, + MPCG_STATE_XID2INITX, + MPCG_STATE_XID7INITW, + MPCG_STATE_XID7INITX, + MPCG_STATE_XID0IOWAIT, + MPCG_STATE_XID0IOWAIX, + MPCG_STATE_XID7INITI, + MPCG_STATE_XID7INITZ, + MPCG_STATE_XID7INITF, + MPCG_STATE_FLOWC, + MPCG_STATE_READY, + MPCG_NR_STATES, +}; + +#endif +/* --- This is the END my friend --- */ diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c new file mode 100644 index 000000000..f63c5c871 --- /dev/null +++ b/drivers/s390/net/ctcm_main.c @@ -0,0 +1,1872 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2001, 2009 + * Author(s): + * Original CTC driver(s): + * Fritz Elfert (felfert@millenux.com) + * Dieter Wellerdiek (wel@de.ibm.com) + * Martin Schwidefsky (schwidefsky@de.ibm.com) + * Denis Joseph Barrow (barrow_dj@yahoo.com) + * Jochen Roehrig (roehrig@de.ibm.com) + * Cornelia Huck + * MPC additions: + * Belinda Thompson (belindat@us.ibm.com) + * Andy Richter (richtera@us.ibm.com) + * Revived by: + * Peter Tiedemann (ptiedem@de.ibm.com) + */ + +#undef DEBUG +#undef DEBUGDATA +#undef DEBUGCCW + +#define KMSG_COMPONENT "ctcm" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include + +#include "ctcm_fsms.h" +#include "ctcm_main.h" + +/* Some common global variables */ + +/** + * The root device for ctcm group devices + */ +static struct device *ctcm_root_dev; + +/* + * Linked list of all detected channels. + */ +struct channel *channels; + +/** + * Unpack a just received skb and hand it over to + * upper layers. + * + * ch The channel where this skb has been received. + * pskb The received skb. + */ +void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb) +{ + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + __u16 len = *((__u16 *) pskb->data); + + skb_put(pskb, 2 + LL_HEADER_LENGTH); + skb_pull(pskb, 2); + pskb->dev = dev; + pskb->ip_summed = CHECKSUM_UNNECESSARY; + while (len > 0) { + struct sk_buff *skb; + int skblen; + struct ll_header *header = (struct ll_header *)pskb->data; + + skb_pull(pskb, LL_HEADER_LENGTH); + if ((ch->protocol == CTCM_PROTO_S390) && + (header->type != ETH_P_IP)) { + if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) { + ch->logflags |= LOG_FLAG_ILLEGALPKT; + /* + * Check packet type only if we stick strictly + * to S/390's protocol of OS390. This only + * supports IP. Otherwise allow any packet + * type. + */ + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): Illegal packet type 0x%04x" + " - dropping", + CTCM_FUNTAIL, dev->name, header->type); + } + priv->stats.rx_dropped++; + priv->stats.rx_frame_errors++; + return; + } + pskb->protocol = cpu_to_be16(header->type); + if ((header->length <= LL_HEADER_LENGTH) || + (len <= LL_HEADER_LENGTH)) { + if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): Illegal packet size %d(%d,%d)" + "- dropping", + CTCM_FUNTAIL, dev->name, + header->length, dev->mtu, len); + ch->logflags |= LOG_FLAG_ILLEGALSIZE; + } + + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + return; + } + header->length -= LL_HEADER_LENGTH; + len -= LL_HEADER_LENGTH; + if ((header->length > skb_tailroom(pskb)) || + (header->length > len)) { + if (!(ch->logflags & LOG_FLAG_OVERRUN)) { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): Packet size %d (overrun)" + " - dropping", CTCM_FUNTAIL, + dev->name, header->length); + ch->logflags |= LOG_FLAG_OVERRUN; + } + + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + return; + } + skb_put(pskb, header->length); + skb_reset_mac_header(pskb); + len -= header->length; + skb = dev_alloc_skb(pskb->len); + if (!skb) { + if (!(ch->logflags & LOG_FLAG_NOMEM)) { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): MEMORY allocation error", + CTCM_FUNTAIL, dev->name); + ch->logflags |= LOG_FLAG_NOMEM; + } + priv->stats.rx_dropped++; + return; + } + skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len), + pskb->len); + skb_reset_mac_header(skb); + skb->dev = pskb->dev; + skb->protocol = pskb->protocol; + pskb->ip_summed = CHECKSUM_UNNECESSARY; + skblen = skb->len; + /* + * reset logflags + */ + ch->logflags = 0; + priv->stats.rx_packets++; + priv->stats.rx_bytes += skblen; + netif_rx_ni(skb); + if (len > 0) { + skb_pull(pskb, header->length); + if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { + CTCM_DBF_DEV_NAME(TRACE, dev, + "Overrun in ctcm_unpack_skb"); + ch->logflags |= LOG_FLAG_OVERRUN; + return; + } + skb_put(pskb, LL_HEADER_LENGTH); + } + } +} + +/** + * Release a specific channel in the channel list. + * + * ch Pointer to channel struct to be released. + */ +static void channel_free(struct channel *ch) +{ + CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id); + ch->flags &= ~CHANNEL_FLAGS_INUSE; + fsm_newstate(ch->fsm, CTC_STATE_IDLE); +} + +/** + * Remove a specific channel in the channel list. + * + * ch Pointer to channel struct to be released. + */ +static void channel_remove(struct channel *ch) +{ + struct channel **c = &channels; + char chid[CTCM_ID_SIZE+1]; + int ok = 0; + + if (ch == NULL) + return; + else + strncpy(chid, ch->id, CTCM_ID_SIZE); + + channel_free(ch); + while (*c) { + if (*c == ch) { + *c = ch->next; + fsm_deltimer(&ch->timer); + if (IS_MPC(ch)) + fsm_deltimer(&ch->sweep_timer); + + kfree_fsm(ch->fsm); + clear_normalized_cda(&ch->ccw[4]); + if (ch->trans_skb != NULL) { + clear_normalized_cda(&ch->ccw[1]); + dev_kfree_skb_any(ch->trans_skb); + } + if (IS_MPC(ch)) { + tasklet_kill(&ch->ch_tasklet); + tasklet_kill(&ch->ch_disc_tasklet); + kfree(ch->discontact_th); + } + kfree(ch->ccw); + kfree(ch->irb); + kfree(ch); + ok = 1; + break; + } + c = &((*c)->next); + } + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL, + chid, ok ? "OK" : "failed"); +} + +/** + * Get a specific channel from the channel list. + * + * type Type of channel we are interested in. + * id Id of channel we are interested in. + * direction Direction we want to use this channel for. + * + * returns Pointer to a channel or NULL if no matching channel available. + */ +static struct channel *channel_get(enum ctcm_channel_types type, + char *id, int direction) +{ + struct channel *ch = channels; + + while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type))) + ch = ch->next; + if (!ch) { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%d, %s, %d) not found in channel list\n", + CTCM_FUNTAIL, type, id, direction); + } else { + if (ch->flags & CHANNEL_FLAGS_INUSE) + ch = NULL; + else { + ch->flags |= CHANNEL_FLAGS_INUSE; + ch->flags &= ~CHANNEL_FLAGS_RWMASK; + ch->flags |= (direction == CTCM_WRITE) + ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; + fsm_newstate(ch->fsm, CTC_STATE_STOPPED); + } + } + return ch; +} + +static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb) +{ + if (!IS_ERR(irb)) + return 0; + + CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN, + "irb error %ld on device %s\n", + PTR_ERR(irb), dev_name(&cdev->dev)); + + switch (PTR_ERR(irb)) { + case -EIO: + dev_err(&cdev->dev, + "An I/O-error occurred on the CTCM device\n"); + break; + case -ETIMEDOUT: + dev_err(&cdev->dev, + "An adapter hardware operation timed out\n"); + break; + default: + dev_err(&cdev->dev, + "An error occurred on the adapter hardware\n"); + } + return PTR_ERR(irb); +} + + +/** + * Check sense of a unit check. + * + * ch The channel, the sense code belongs to. + * sense The sense code to inspect. + */ +static void ccw_unit_check(struct channel *ch, __u8 sense) +{ + CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, + "%s(%s): %02x", + CTCM_FUNTAIL, ch->id, sense); + + if (sense & SNS0_INTERVENTION_REQ) { + if (sense & 0x01) { + if (ch->sense_rc != 0x01) { + pr_notice( + "%s: The communication peer has " + "disconnected\n", ch->id); + ch->sense_rc = 0x01; + } + fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch); + } else { + if (ch->sense_rc != SNS0_INTERVENTION_REQ) { + pr_notice( + "%s: The remote operating system is " + "not available\n", ch->id); + ch->sense_rc = SNS0_INTERVENTION_REQ; + } + fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch); + } + } else if (sense & SNS0_EQUIPMENT_CHECK) { + if (sense & SNS0_BUS_OUT_CHECK) { + if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, + "%s(%s): remote HW error %02x", + CTCM_FUNTAIL, ch->id, sense); + ch->sense_rc = SNS0_BUS_OUT_CHECK; + } + fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch); + } else { + if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, + "%s(%s): remote read parity error %02x", + CTCM_FUNTAIL, ch->id, sense); + ch->sense_rc = SNS0_EQUIPMENT_CHECK; + } + fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch); + } + } else if (sense & SNS0_BUS_OUT_CHECK) { + if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, + "%s(%s): BUS OUT error %02x", + CTCM_FUNTAIL, ch->id, sense); + ch->sense_rc = SNS0_BUS_OUT_CHECK; + } + if (sense & 0x04) /* data-streaming timeout */ + fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch); + else /* Data-transfer parity error */ + fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch); + } else if (sense & SNS0_CMD_REJECT) { + if (ch->sense_rc != SNS0_CMD_REJECT) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, + "%s(%s): Command rejected", + CTCM_FUNTAIL, ch->id); + ch->sense_rc = SNS0_CMD_REJECT; + } + } else if (sense == 0) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, + "%s(%s): Unit check ZERO", + CTCM_FUNTAIL, ch->id); + fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch); + } else { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, + "%s(%s): Unit check code %02x unknown", + CTCM_FUNTAIL, ch->id, sense); + fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch); + } +} + +int ctcm_ch_alloc_buffer(struct channel *ch) +{ + clear_normalized_cda(&ch->ccw[1]); + ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA); + if (ch->trans_skb == NULL) { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): %s trans_skb allocation error", + CTCM_FUNTAIL, ch->id, + (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? + "RX" : "TX"); + return -ENOMEM; + } + + ch->ccw[1].count = ch->max_bufsize; + if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { + dev_kfree_skb(ch->trans_skb); + ch->trans_skb = NULL; + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): %s set norm_cda failed", + CTCM_FUNTAIL, ch->id, + (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? + "RX" : "TX"); + return -ENOMEM; + } + + ch->ccw[1].count = 0; + ch->trans_skb_data = ch->trans_skb->data; + ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; + return 0; +} + +/* + * Interface API for upper network layers + */ + +/** + * Open an interface. + * Called from generic network layer when ifconfig up is run. + * + * dev Pointer to interface struct. + * + * returns 0 on success, -ERRNO on failure. (Never fails.) + */ +int ctcm_open(struct net_device *dev) +{ + struct ctcm_priv *priv = dev->ml_priv; + + CTCMY_DBF_DEV_NAME(SETUP, dev, ""); + if (!IS_MPC(priv)) + fsm_event(priv->fsm, DEV_EVENT_START, dev); + return 0; +} + +/** + * Close an interface. + * Called from generic network layer when ifconfig down is run. + * + * dev Pointer to interface struct. + * + * returns 0 on success, -ERRNO on failure. (Never fails.) + */ +int ctcm_close(struct net_device *dev) +{ + struct ctcm_priv *priv = dev->ml_priv; + + CTCMY_DBF_DEV_NAME(SETUP, dev, ""); + if (!IS_MPC(priv)) + fsm_event(priv->fsm, DEV_EVENT_STOP, dev); + return 0; +} + + +/** + * Transmit a packet. + * This is a helper function for ctcm_tx(). + * + * ch Channel to be used for sending. + * skb Pointer to struct sk_buff of packet to send. + * The linklevel header has already been set up + * by ctcm_tx(). + * + * returns 0 on success, -ERRNO on failure. (Never fails.) + */ +static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb) +{ + unsigned long saveflags; + struct ll_header header; + int rc = 0; + __u16 block_len; + int ccw_idx; + struct sk_buff *nskb; + unsigned long hi; + + /* we need to acquire the lock for testing the state + * otherwise we can have an IRQ changing the state to + * TXIDLE after the test but before acquiring the lock. + */ + spin_lock_irqsave(&ch->collect_lock, saveflags); + if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) { + int l = skb->len + LL_HEADER_LENGTH; + + if (ch->collect_len + l > ch->max_bufsize - 2) { + spin_unlock_irqrestore(&ch->collect_lock, saveflags); + return -EBUSY; + } else { + refcount_inc(&skb->users); + header.length = l; + header.type = be16_to_cpu(skb->protocol); + header.unused = 0; + memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, + LL_HEADER_LENGTH); + skb_queue_tail(&ch->collect_queue, skb); + ch->collect_len += l; + } + spin_unlock_irqrestore(&ch->collect_lock, saveflags); + goto done; + } + spin_unlock_irqrestore(&ch->collect_lock, saveflags); + /* + * Protect skb against beeing free'd by upper + * layers. + */ + refcount_inc(&skb->users); + ch->prof.txlen += skb->len; + header.length = skb->len + LL_HEADER_LENGTH; + header.type = be16_to_cpu(skb->protocol); + header.unused = 0; + memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH); + block_len = skb->len + 2; + *((__u16 *)skb_push(skb, 2)) = block_len; + + /* + * IDAL support in CTCM is broken, so we have to + * care about skb's above 2G ourselves. + */ + hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31; + if (hi) { + nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); + if (!nskb) { + refcount_dec(&skb->users); + skb_pull(skb, LL_HEADER_LENGTH + 2); + ctcm_clear_busy(ch->netdev); + return -ENOMEM; + } else { + skb_put_data(nskb, skb->data, skb->len); + refcount_inc(&nskb->users); + refcount_dec(&skb->users); + dev_kfree_skb_irq(skb); + skb = nskb; + } + } + + ch->ccw[4].count = block_len; + if (set_normalized_cda(&ch->ccw[4], skb->data)) { + /* + * idal allocation failed, try via copying to + * trans_skb. trans_skb usually has a pre-allocated + * idal. + */ + if (ctcm_checkalloc_buffer(ch)) { + /* + * Remove our header. It gets added + * again on retransmit. + */ + refcount_dec(&skb->users); + skb_pull(skb, LL_HEADER_LENGTH + 2); + ctcm_clear_busy(ch->netdev); + return -ENOMEM; + } + + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + ch->ccw[1].count = skb->len; + skb_copy_from_linear_data(skb, + skb_put(ch->trans_skb, skb->len), skb->len); + refcount_dec(&skb->users); + dev_kfree_skb_irq(skb); + ccw_idx = 0; + } else { + skb_queue_tail(&ch->io_queue, skb); + ccw_idx = 3; + } + if (do_debug_ccw) + ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], + sizeof(struct ccw1) * 3); + ch->retry = 0; + fsm_newstate(ch->fsm, CTC_STATE_TX); + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + ch->prof.send_stamp = jiffies; + rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], + (unsigned long)ch, 0xff, 0); + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + if (ccw_idx == 3) + ch->prof.doios_single++; + if (rc != 0) { + fsm_deltimer(&ch->timer); + ctcm_ccw_check_rc(ch, rc, "single skb TX"); + if (ccw_idx == 3) + skb_dequeue_tail(&ch->io_queue); + /* + * Remove our header. It gets added + * again on retransmit. + */ + skb_pull(skb, LL_HEADER_LENGTH + 2); + } else if (ccw_idx == 0) { + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; + } +done: + ctcm_clear_busy(ch->netdev); + return rc; +} + +static void ctcmpc_send_sweep_req(struct channel *rch) +{ + struct net_device *dev = rch->netdev; + struct ctcm_priv *priv; + struct mpc_group *grp; + struct th_sweep *header; + struct sk_buff *sweep_skb; + struct channel *ch; + /* int rc = 0; */ + + priv = dev->ml_priv; + grp = priv->mpcg; + ch = priv->channel[CTCM_WRITE]; + + /* sweep processing is not complete until response and request */ + /* has completed for all read channels in group */ + if (grp->in_sweep == 0) { + grp->in_sweep = 1; + grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; + grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; + } + + sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); + + if (sweep_skb == NULL) { + /* rc = -ENOMEM; */ + goto nomem; + } + + header = kmalloc(TH_SWEEP_LENGTH, gfp_type()); + + if (!header) { + dev_kfree_skb_any(sweep_skb); + /* rc = -ENOMEM; */ + goto nomem; + } + + header->th.th_seg = 0x00 ; + header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */ + header->th.th_blk_flag = 0x00; + header->th.th_is_xid = 0x00; + header->th.th_seq_num = 0x00; + header->sw.th_last_seq = ch->th_seq_num; + + skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH); + + kfree(header); + + netif_trans_update(dev); + skb_queue_tail(&ch->sweep_queue, sweep_skb); + + fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); + + return; + +nomem: + grp->in_sweep = 0; + ctcm_clear_busy(dev); + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + + return; +} + +/* + * MPC mode version of transmit_skb + */ +static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb) +{ + struct pdu *p_header; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct th_header *header; + struct sk_buff *nskb; + int rc = 0; + int ccw_idx; + unsigned long hi; + unsigned long saveflags = 0; /* avoids compiler warning */ + + CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n", + __func__, dev->name, smp_processor_id(), ch, + ch->id, fsm_getstate_str(ch->fsm)); + + if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) { + spin_lock_irqsave(&ch->collect_lock, saveflags); + refcount_inc(&skb->users); + p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); + + if (!p_header) { + spin_unlock_irqrestore(&ch->collect_lock, saveflags); + goto nomem_exit; + } + + p_header->pdu_offset = skb->len; + p_header->pdu_proto = 0x01; + p_header->pdu_flag = 0x00; + if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) { + p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; + } else { + p_header->pdu_flag |= PDU_FIRST; + } + p_header->pdu_seq = 0; + memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, + PDU_HEADER_LENGTH); + + CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n" + "pdu header and data for up to 32 bytes:\n", + __func__, dev->name, skb->len); + CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); + + skb_queue_tail(&ch->collect_queue, skb); + ch->collect_len += skb->len; + kfree(p_header); + + spin_unlock_irqrestore(&ch->collect_lock, saveflags); + goto done; + } + + /* + * Protect skb against beeing free'd by upper + * layers. + */ + refcount_inc(&skb->users); + + /* + * IDAL support in CTCM is broken, so we have to + * care about skb's above 2G ourselves. + */ + hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; + if (hi) { + nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); + if (!nskb) { + goto nomem_exit; + } else { + skb_put_data(nskb, skb->data, skb->len); + refcount_inc(&nskb->users); + refcount_dec(&skb->users); + dev_kfree_skb_irq(skb); + skb = nskb; + } + } + + p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); + + if (!p_header) + goto nomem_exit; + + p_header->pdu_offset = skb->len; + p_header->pdu_proto = 0x01; + p_header->pdu_flag = 0x00; + p_header->pdu_seq = 0; + if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) { + p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; + } else { + p_header->pdu_flag |= PDU_FIRST; + } + memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH); + + kfree(p_header); + + if (ch->collect_len > 0) { + spin_lock_irqsave(&ch->collect_lock, saveflags); + skb_queue_tail(&ch->collect_queue, skb); + ch->collect_len += skb->len; + skb = skb_dequeue(&ch->collect_queue); + ch->collect_len -= skb->len; + spin_unlock_irqrestore(&ch->collect_lock, saveflags); + } + + p_header = (struct pdu *)skb->data; + p_header->pdu_flag |= PDU_LAST; + + ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; + + header = kmalloc(TH_HEADER_LENGTH, gfp_type()); + if (!header) + goto nomem_exit; + + header->th_seg = 0x00; + header->th_ch_flag = TH_HAS_PDU; /* Normal data */ + header->th_blk_flag = 0x00; + header->th_is_xid = 0x00; /* Just data here */ + ch->th_seq_num++; + header->th_seq_num = ch->th_seq_num; + + CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" , + __func__, dev->name, ch->th_seq_num); + + /* put the TH on the packet */ + memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH); + + kfree(header); + + CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for " + "up to 32 bytes sent to vtam:\n", + __func__, dev->name, skb->len); + CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); + + ch->ccw[4].count = skb->len; + if (set_normalized_cda(&ch->ccw[4], skb->data)) { + /* + * idal allocation failed, try via copying to trans_skb. + * trans_skb usually has a pre-allocated idal. + */ + if (ctcm_checkalloc_buffer(ch)) { + /* + * Remove our header. + * It gets added again on retransmit. + */ + goto nomem_exit; + } + + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + ch->ccw[1].count = skb->len; + skb_put_data(ch->trans_skb, skb->data, skb->len); + refcount_dec(&skb->users); + dev_kfree_skb_irq(skb); + ccw_idx = 0; + CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n" + "up to 32 bytes sent to vtam:\n", + __func__, dev->name, ch->trans_skb->len); + CTCM_D3_DUMP((char *)ch->trans_skb->data, + min_t(int, 32, ch->trans_skb->len)); + } else { + skb_queue_tail(&ch->io_queue, skb); + ccw_idx = 3; + } + ch->retry = 0; + fsm_newstate(ch->fsm, CTC_STATE_TX); + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + + if (do_debug_ccw) + ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], + sizeof(struct ccw1) * 3); + + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + ch->prof.send_stamp = jiffies; + rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], + (unsigned long)ch, 0xff, 0); + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + if (ccw_idx == 3) + ch->prof.doios_single++; + if (rc != 0) { + fsm_deltimer(&ch->timer); + ctcm_ccw_check_rc(ch, rc, "single skb TX"); + if (ccw_idx == 3) + skb_dequeue_tail(&ch->io_queue); + } else if (ccw_idx == 0) { + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; + } + if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ + ctcmpc_send_sweep_req(ch); + + goto done; +nomem_exit: + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, + "%s(%s): MEMORY allocation ERROR\n", + CTCM_FUNTAIL, ch->id); + rc = -ENOMEM; + refcount_dec(&skb->users); + dev_kfree_skb_any(skb); + fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); +done: + CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); + return rc; +} + +/** + * Start transmission of a packet. + * Called from generic network device layer. + * + * skb Pointer to buffer containing the packet. + * dev Pointer to interface struct. + * + * returns 0 if packet consumed, !0 if packet rejected. + * Note: If we return !0, then the packet is free'd by + * the generic network layer. + */ +/* first merge version - leaving both functions separated */ +static int ctcm_tx(struct sk_buff *skb, struct net_device *dev) +{ + struct ctcm_priv *priv = dev->ml_priv; + + if (skb == NULL) { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): NULL sk_buff passed", + CTCM_FUNTAIL, dev->name); + priv->stats.tx_dropped++; + return NETDEV_TX_OK; + } + if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): Got sk_buff with head room < %ld bytes", + CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); + dev_kfree_skb(skb); + priv->stats.tx_dropped++; + return NETDEV_TX_OK; + } + + /* + * If channels are not running, try to restart them + * and throw away packet. + */ + if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { + fsm_event(priv->fsm, DEV_EVENT_START, dev); + dev_kfree_skb(skb); + priv->stats.tx_dropped++; + priv->stats.tx_errors++; + priv->stats.tx_carrier_errors++; + return NETDEV_TX_OK; + } + + if (ctcm_test_and_set_busy(dev)) + return NETDEV_TX_BUSY; + + netif_trans_update(dev); + if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) + return NETDEV_TX_BUSY; + return NETDEV_TX_OK; +} + +/* unmerged MPC variant of ctcm_tx */ +static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) +{ + int len = 0; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct sk_buff *newskb = NULL; + + /* + * Some sanity checks ... + */ + if (skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): NULL sk_buff passed", + CTCM_FUNTAIL, dev->name); + priv->stats.tx_dropped++; + goto done; + } + if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, + "%s(%s): Got sk_buff with head room < %ld bytes", + CTCM_FUNTAIL, dev->name, + TH_HEADER_LENGTH + PDU_HEADER_LENGTH); + + CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); + + len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; + newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); + + if (!newskb) { + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, + "%s: %s: __dev_alloc_skb failed", + __func__, dev->name); + + dev_kfree_skb_any(skb); + priv->stats.tx_dropped++; + priv->stats.tx_errors++; + priv->stats.tx_carrier_errors++; + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + } + newskb->protocol = skb->protocol; + skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); + skb_put_data(newskb, skb->data, skb->len); + dev_kfree_skb_any(skb); + skb = newskb; + } + + /* + * If channels are not running, + * notify anybody about a link failure and throw + * away packet. + */ + if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || + (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { + dev_kfree_skb_any(skb); + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): inactive MPCGROUP - dropped", + CTCM_FUNTAIL, dev->name); + priv->stats.tx_dropped++; + priv->stats.tx_errors++; + priv->stats.tx_carrier_errors++; + goto done; + } + + if (ctcm_test_and_set_busy(dev)) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): device busy - dropped", + CTCM_FUNTAIL, dev->name); + dev_kfree_skb_any(skb); + priv->stats.tx_dropped++; + priv->stats.tx_errors++; + priv->stats.tx_carrier_errors++; + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + } + + netif_trans_update(dev); + if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): device error - dropped", + CTCM_FUNTAIL, dev->name); + dev_kfree_skb_any(skb); + priv->stats.tx_dropped++; + priv->stats.tx_errors++; + priv->stats.tx_carrier_errors++; + ctcm_clear_busy(dev); + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + } + ctcm_clear_busy(dev); +done: + if (do_debug) + MPC_DBF_DEV_NAME(TRACE, dev, "exit"); + + return NETDEV_TX_OK; /* handle freeing of skb here */ +} + + +/** + * Sets MTU of an interface. + * + * dev Pointer to interface struct. + * new_mtu The new MTU to use for this interface. + * + * returns 0 on success, -EINVAL if MTU is out of valid range. + * (valid range is 576 .. 65527). If VM is on the + * remote side, maximum MTU is 32760, however this is + * not checked here. + */ +static int ctcm_change_mtu(struct net_device *dev, int new_mtu) +{ + struct ctcm_priv *priv; + int max_bufsize; + + priv = dev->ml_priv; + max_bufsize = priv->channel[CTCM_READ]->max_bufsize; + + if (IS_MPC(priv)) { + if (new_mtu > max_bufsize - TH_HEADER_LENGTH) + return -EINVAL; + dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; + } else { + if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) + return -EINVAL; + dev->hard_header_len = LL_HEADER_LENGTH + 2; + } + dev->mtu = new_mtu; + return 0; +} + +/** + * Returns interface statistics of a device. + * + * dev Pointer to interface struct. + * + * returns Pointer to stats struct of this interface. + */ +static struct net_device_stats *ctcm_stats(struct net_device *dev) +{ + return &((struct ctcm_priv *)dev->ml_priv)->stats; +} + +static void ctcm_free_netdevice(struct net_device *dev) +{ + struct ctcm_priv *priv; + struct mpc_group *grp; + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, + "%s(%s)", CTCM_FUNTAIL, dev->name); + priv = dev->ml_priv; + if (priv) { + grp = priv->mpcg; + if (grp) { + if (grp->fsm) + kfree_fsm(grp->fsm); + if (grp->xid_skb) + dev_kfree_skb(grp->xid_skb); + if (grp->rcvd_xid_skb) + dev_kfree_skb(grp->rcvd_xid_skb); + tasklet_kill(&grp->mpc_tasklet2); + kfree(grp); + priv->mpcg = NULL; + } + if (priv->fsm) { + kfree_fsm(priv->fsm); + priv->fsm = NULL; + } + kfree(priv->xid); + priv->xid = NULL; + /* + * Note: kfree(priv); is done in "opposite" function of + * allocator function probe_device which is remove_device. + */ + } +#ifdef MODULE + free_netdev(dev); +#endif +} + +struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); + +static const struct net_device_ops ctcm_netdev_ops = { + .ndo_open = ctcm_open, + .ndo_stop = ctcm_close, + .ndo_get_stats = ctcm_stats, + .ndo_change_mtu = ctcm_change_mtu, + .ndo_start_xmit = ctcm_tx, +}; + +static const struct net_device_ops ctcm_mpc_netdev_ops = { + .ndo_open = ctcm_open, + .ndo_stop = ctcm_close, + .ndo_get_stats = ctcm_stats, + .ndo_change_mtu = ctcm_change_mtu, + .ndo_start_xmit = ctcmpc_tx, +}; + +static void ctcm_dev_setup(struct net_device *dev) +{ + dev->type = ARPHRD_SLIP; + dev->tx_queue_len = 100; + dev->flags = IFF_POINTOPOINT | IFF_NOARP; + dev->min_mtu = 576; + dev->max_mtu = 65527; +} + +/* + * Initialize everything of the net device except the name and the + * channel structs. + */ +static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) +{ + struct net_device *dev; + struct mpc_group *grp; + if (!priv) + return NULL; + + if (IS_MPC(priv)) + dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN, + ctcm_dev_setup); + else + dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN, + ctcm_dev_setup); + + if (!dev) { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, + "%s: MEMORY allocation ERROR", + CTCM_FUNTAIL); + return NULL; + } + dev->ml_priv = priv; + priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, + CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, + dev_fsm, dev_fsm_len, GFP_KERNEL); + if (priv->fsm == NULL) { + CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); + free_netdev(dev); + return NULL; + } + fsm_newstate(priv->fsm, DEV_STATE_STOPPED); + fsm_settimer(priv->fsm, &priv->restart_timer); + + if (IS_MPC(priv)) { + /* MPC Group Initializations */ + grp = ctcmpc_init_mpc_group(priv); + if (grp == NULL) { + MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); + free_netdev(dev); + return NULL; + } + tasklet_init(&grp->mpc_tasklet2, + mpc_group_ready, (unsigned long)dev); + dev->mtu = MPC_BUFSIZE_DEFAULT - + TH_HEADER_LENGTH - PDU_HEADER_LENGTH; + + dev->netdev_ops = &ctcm_mpc_netdev_ops; + dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; + priv->buffer_size = MPC_BUFSIZE_DEFAULT; + } else { + dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; + dev->netdev_ops = &ctcm_netdev_ops; + dev->hard_header_len = LL_HEADER_LENGTH + 2; + } + + CTCMY_DBF_DEV(SETUP, dev, "finished"); + + return dev; +} + +/** + * Main IRQ handler. + * + * cdev The ccw_device the interrupt is for. + * intparm interruption parameter. + * irb interruption response block. + */ +static void ctcm_irq_handler(struct ccw_device *cdev, + unsigned long intparm, struct irb *irb) +{ + struct channel *ch; + struct net_device *dev; + struct ctcm_priv *priv; + struct ccwgroup_device *cgdev; + int cstat; + int dstat; + + CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, + "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev)); + + if (ctcm_check_irb_error(cdev, irb)) + return; + + cgdev = dev_get_drvdata(&cdev->dev); + + cstat = irb->scsw.cmd.cstat; + dstat = irb->scsw.cmd.dstat; + + /* Check for unsolicited interrupts. */ + if (cgdev == NULL) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR, + "%s(%s) unsolicited irq: c-%02x d-%02x\n", + CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat); + dev_warn(&cdev->dev, + "The adapter received a non-specific IRQ\n"); + return; + } + + priv = dev_get_drvdata(&cgdev->dev); + + /* Try to extract channel from driver data. */ + if (priv->channel[CTCM_READ]->cdev == cdev) + ch = priv->channel[CTCM_READ]; + else if (priv->channel[CTCM_WRITE]->cdev == cdev) + ch = priv->channel[CTCM_WRITE]; + else { + dev_err(&cdev->dev, + "%s: Internal error: Can't determine channel for " + "interrupt device %s\n", + __func__, dev_name(&cdev->dev)); + /* Explain: inconsistent internal structures */ + return; + } + + dev = ch->netdev; + if (dev == NULL) { + dev_err(&cdev->dev, + "%s Internal error: net_device is NULL, ch = 0x%p\n", + __func__, ch); + /* Explain: inconsistent internal structures */ + return; + } + + /* Copy interruption response block. */ + memcpy(ch->irb, irb, sizeof(struct irb)); + + /* Issue error message and return on subchannel error code */ + if (irb->scsw.cmd.cstat) { + fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch); + CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, + "%s(%s): sub-ch check %s: cs=%02x ds=%02x", + CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat); + dev_warn(&cdev->dev, + "A check occurred on the subchannel\n"); + return; + } + + /* Check the reason-code of a unit check */ + if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { + if ((irb->ecw[0] & ch->sense_rc) == 0) + /* print it only once */ + CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, + "%s(%s): sense=%02x, ds=%02x", + CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat); + ccw_unit_check(ch, irb->ecw[0]); + return; + } + if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) { + if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) + fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch); + else + fsm_event(ch->fsm, CTC_EVENT_BUSY, ch); + return; + } + if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { + fsm_event(ch->fsm, CTC_EVENT_ATTN, ch); + return; + } + if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) || + (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) || + (irb->scsw.cmd.stctl == + (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) + fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch); + else + fsm_event(ch->fsm, CTC_EVENT_IRQ, ch); + +} + +static const struct device_type ctcm_devtype = { + .name = "ctcm", + .groups = ctcm_attr_groups, +}; + +/** + * Add ctcm specific attributes. + * Add ctcm private data. + * + * cgdev pointer to ccwgroup_device just added + * + * returns 0 on success, !0 on failure. + */ +static int ctcm_probe_device(struct ccwgroup_device *cgdev) +{ + struct ctcm_priv *priv; + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, + "%s %p", + __func__, cgdev); + + if (!get_device(&cgdev->dev)) + return -ENODEV; + + priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL); + if (!priv) { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s: memory allocation failure", + CTCM_FUNTAIL); + put_device(&cgdev->dev); + return -ENOMEM; + } + priv->buffer_size = CTCM_BUFSIZE_DEFAULT; + cgdev->cdev[0]->handler = ctcm_irq_handler; + cgdev->cdev[1]->handler = ctcm_irq_handler; + dev_set_drvdata(&cgdev->dev, priv); + cgdev->dev.type = &ctcm_devtype; + + return 0; +} + +/** + * Add a new channel to the list of channels. + * Keeps the channel list sorted. + * + * cdev The ccw_device to be added. + * type The type class of the new channel. + * priv Points to the private data of the ccwgroup_device. + * + * returns 0 on success, !0 on error. + */ +static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type, + struct ctcm_priv *priv) +{ + struct channel **c = &channels; + struct channel *ch; + int ccw_num; + int rc = 0; + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, + "%s(%s), type %d, proto %d", + __func__, dev_name(&cdev->dev), type, priv->protocol); + + ch = kzalloc(sizeof(struct channel), GFP_KERNEL); + if (ch == NULL) + return -ENOMEM; + + ch->protocol = priv->protocol; + if (IS_MPC(priv)) { + ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type()); + if (ch->discontact_th == NULL) + goto nomem_return; + + ch->discontact_th->th_blk_flag = TH_DISCONTACT; + tasklet_init(&ch->ch_disc_tasklet, + mpc_action_send_discontact, (unsigned long)ch); + + tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch); + ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35); + ccw_num = 17; + } else + ccw_num = 8; + + ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); + if (ch->ccw == NULL) + goto nomem_return; + + ch->cdev = cdev; + snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev)); + ch->type = type; + + /** + * "static" ccws are used in the following way: + * + * ccw[0..2] (Channel program for generic I/O): + * 0: prepare + * 1: read or write (depending on direction) with fixed + * buffer (idal allocated once when buffer is allocated) + * 2: nop + * ccw[3..5] (Channel program for direct write of packets) + * 3: prepare + * 4: write (idal allocated on every write). + * 5: nop + * ccw[6..7] (Channel program for initial channel setup): + * 6: set extended mode + * 7: nop + * + * ch->ccw[0..5] are initialized in ch_action_start because + * the channel's direction is yet unknown here. + * + * ccws used for xid2 negotiations + * ch-ccw[8-14] need to be used for the XID exchange either + * X side XID2 Processing + * 8: write control + * 9: write th + * 10: write XID + * 11: read th from secondary + * 12: read XID from secondary + * 13: read 4 byte ID + * 14: nop + * Y side XID Processing + * 8: sense + * 9: read th + * 10: read XID + * 11: write th + * 12: write XID + * 13: write 4 byte ID + * 14: nop + * + * ccws used for double noop due to VM timing issues + * which result in unrecoverable Busy on channel + * 15: nop + * 16: nop + */ + ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; + ch->ccw[6].flags = CCW_FLAG_SLI; + + ch->ccw[7].cmd_code = CCW_CMD_NOOP; + ch->ccw[7].flags = CCW_FLAG_SLI; + + if (IS_MPC(priv)) { + ch->ccw[15].cmd_code = CCW_CMD_WRITE; + ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[15].count = TH_HEADER_LENGTH; + ch->ccw[15].cda = virt_to_phys(ch->discontact_th); + + ch->ccw[16].cmd_code = CCW_CMD_NOOP; + ch->ccw[16].flags = CCW_FLAG_SLI; + + ch->fsm = init_fsm(ch->id, ctc_ch_state_names, + ctc_ch_event_names, CTC_MPC_NR_STATES, + CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm, + mpc_ch_fsm_len, GFP_KERNEL); + } else { + ch->fsm = init_fsm(ch->id, ctc_ch_state_names, + ctc_ch_event_names, CTC_NR_STATES, + CTC_NR_EVENTS, ch_fsm, + ch_fsm_len, GFP_KERNEL); + } + if (ch->fsm == NULL) + goto nomem_return; + + fsm_newstate(ch->fsm, CTC_STATE_IDLE); + + ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); + if (ch->irb == NULL) + goto nomem_return; + + while (*c && ctcm_less_than((*c)->id, ch->id)) + c = &(*c)->next; + + if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) { + CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, + "%s (%s) already in list, using old entry", + __func__, (*c)->id); + + goto free_return; + } + + spin_lock_init(&ch->collect_lock); + + fsm_settimer(ch->fsm, &ch->timer); + skb_queue_head_init(&ch->io_queue); + skb_queue_head_init(&ch->collect_queue); + + if (IS_MPC(priv)) { + fsm_settimer(ch->fsm, &ch->sweep_timer); + skb_queue_head_init(&ch->sweep_queue); + } + ch->next = *c; + *c = ch; + return 0; + +nomem_return: + rc = -ENOMEM; + +free_return: /* note that all channel pointers are 0 or valid */ + kfree(ch->ccw); + kfree(ch->discontact_th); + kfree_fsm(ch->fsm); + kfree(ch->irb); + kfree(ch); + return rc; +} + +/* + * Return type of a detected device. + */ +static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id) +{ + enum ctcm_channel_types type; + type = (enum ctcm_channel_types)id->driver_info; + + if (type == ctcm_channel_type_ficon) + type = ctcm_channel_type_escon; + + return type; +} + +/** + * + * Setup an interface. + * + * cgdev Device to be setup. + * + * returns 0 on success, !0 on failure. + */ +static int ctcm_new_device(struct ccwgroup_device *cgdev) +{ + char read_id[CTCM_ID_SIZE]; + char write_id[CTCM_ID_SIZE]; + int direction; + enum ctcm_channel_types type; + struct ctcm_priv *priv; + struct net_device *dev; + struct ccw_device *cdev0; + struct ccw_device *cdev1; + struct channel *readc; + struct channel *writec; + int ret; + int result; + + priv = dev_get_drvdata(&cgdev->dev); + if (!priv) { + result = -ENODEV; + goto out_err_result; + } + + cdev0 = cgdev->cdev[0]; + cdev1 = cgdev->cdev[1]; + + type = get_channel_type(&cdev0->id); + + snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev)); + snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev)); + + ret = add_channel(cdev0, type, priv); + if (ret) { + result = ret; + goto out_err_result; + } + ret = add_channel(cdev1, type, priv); + if (ret) { + result = ret; + goto out_remove_channel1; + } + + ret = ccw_device_set_online(cdev0); + if (ret != 0) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s(%s) set_online rc=%d", + CTCM_FUNTAIL, read_id, ret); + result = -EIO; + goto out_remove_channel2; + } + + ret = ccw_device_set_online(cdev1); + if (ret != 0) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s(%s) set_online rc=%d", + CTCM_FUNTAIL, write_id, ret); + + result = -EIO; + goto out_ccw1; + } + + dev = ctcm_init_netdevice(priv); + if (dev == NULL) { + result = -ENODEV; + goto out_ccw2; + } + + for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { + priv->channel[direction] = + channel_get(type, direction == CTCM_READ ? + read_id : write_id, direction); + if (priv->channel[direction] == NULL) { + if (direction == CTCM_WRITE) + channel_free(priv->channel[CTCM_READ]); + result = -ENODEV; + goto out_dev; + } + priv->channel[direction]->netdev = dev; + priv->channel[direction]->protocol = priv->protocol; + priv->channel[direction]->max_bufsize = priv->buffer_size; + } + /* sysfs magic */ + SET_NETDEV_DEV(dev, &cgdev->dev); + + if (register_netdev(dev)) { + result = -ENODEV; + goto out_dev; + } + + strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); + + dev_info(&dev->dev, + "setup OK : r/w = %s/%s, protocol : %d\n", + priv->channel[CTCM_READ]->id, + priv->channel[CTCM_WRITE]->id, priv->protocol); + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, + "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name, + priv->channel[CTCM_READ]->id, + priv->channel[CTCM_WRITE]->id, priv->protocol); + + return 0; +out_dev: + ctcm_free_netdevice(dev); +out_ccw2: + ccw_device_set_offline(cgdev->cdev[1]); +out_ccw1: + ccw_device_set_offline(cgdev->cdev[0]); +out_remove_channel2: + readc = channel_get(type, read_id, CTCM_READ); + channel_remove(readc); +out_remove_channel1: + writec = channel_get(type, write_id, CTCM_WRITE); + channel_remove(writec); +out_err_result: + return result; +} + +/** + * Shutdown an interface. + * + * cgdev Device to be shut down. + * + * returns 0 on success, !0 on failure. + */ +static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) +{ + struct ctcm_priv *priv; + struct net_device *dev; + + priv = dev_get_drvdata(&cgdev->dev); + if (!priv) + return -ENODEV; + + if (priv->channel[CTCM_READ]) { + dev = priv->channel[CTCM_READ]->netdev; + CTCM_DBF_DEV(SETUP, dev, ""); + /* Close the device */ + ctcm_close(dev); + dev->flags &= ~IFF_RUNNING; + channel_free(priv->channel[CTCM_READ]); + } else + dev = NULL; + + if (priv->channel[CTCM_WRITE]) + channel_free(priv->channel[CTCM_WRITE]); + + if (dev) { + unregister_netdev(dev); + ctcm_free_netdevice(dev); + } + + if (priv->fsm) + kfree_fsm(priv->fsm); + + ccw_device_set_offline(cgdev->cdev[1]); + ccw_device_set_offline(cgdev->cdev[0]); + channel_remove(priv->channel[CTCM_READ]); + channel_remove(priv->channel[CTCM_WRITE]); + priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL; + + return 0; + +} + + +static void ctcm_remove_device(struct ccwgroup_device *cgdev) +{ + struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev); + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, + "removing device %p, proto : %d", + cgdev, priv->protocol); + + if (cgdev->state == CCWGROUP_ONLINE) + ctcm_shutdown_device(cgdev); + dev_set_drvdata(&cgdev->dev, NULL); + kfree(priv); + put_device(&cgdev->dev); +} + +static int ctcm_pm_suspend(struct ccwgroup_device *gdev) +{ + struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); + + if (gdev->state == CCWGROUP_OFFLINE) + return 0; + netif_device_detach(priv->channel[CTCM_READ]->netdev); + ctcm_close(priv->channel[CTCM_READ]->netdev); + if (!wait_event_timeout(priv->fsm->wait_q, + fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) { + netif_device_attach(priv->channel[CTCM_READ]->netdev); + return -EBUSY; + } + ccw_device_set_offline(gdev->cdev[1]); + ccw_device_set_offline(gdev->cdev[0]); + return 0; +} + +static int ctcm_pm_resume(struct ccwgroup_device *gdev) +{ + struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); + int rc; + + if (gdev->state == CCWGROUP_OFFLINE) + return 0; + rc = ccw_device_set_online(gdev->cdev[1]); + if (rc) + goto err_out; + rc = ccw_device_set_online(gdev->cdev[0]); + if (rc) + goto err_out; + ctcm_open(priv->channel[CTCM_READ]->netdev); +err_out: + netif_device_attach(priv->channel[CTCM_READ]->netdev); + return rc; +} + +static struct ccw_device_id ctcm_ids[] = { + {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel}, + {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon}, + {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon}, + {}, +}; +MODULE_DEVICE_TABLE(ccw, ctcm_ids); + +static struct ccw_driver ctcm_ccw_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "ctcm", + }, + .ids = ctcm_ids, + .probe = ccwgroup_probe_ccwdev, + .remove = ccwgroup_remove_ccwdev, + .int_class = IRQIO_CTC, +}; + +static struct ccwgroup_driver ctcm_group_driver = { + .driver = { + .owner = THIS_MODULE, + .name = CTC_DRIVER_NAME, + }, + .ccw_driver = &ctcm_ccw_driver, + .setup = ctcm_probe_device, + .remove = ctcm_remove_device, + .set_online = ctcm_new_device, + .set_offline = ctcm_shutdown_device, + .freeze = ctcm_pm_suspend, + .thaw = ctcm_pm_resume, + .restore = ctcm_pm_resume, +}; + +static ssize_t group_store(struct device_driver *ddrv, const char *buf, + size_t count) +{ + int err; + + err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf); + return err ? err : count; +} +static DRIVER_ATTR_WO(group); + +static struct attribute *ctcm_drv_attrs[] = { + &driver_attr_group.attr, + NULL, +}; +static struct attribute_group ctcm_drv_attr_group = { + .attrs = ctcm_drv_attrs, +}; +static const struct attribute_group *ctcm_drv_attr_groups[] = { + &ctcm_drv_attr_group, + NULL, +}; + +/* + * Module related routines + */ + +/* + * Prepare to be unloaded. Free IRQ's and release all resources. + * This is called just before this module is unloaded. It is + * not called, if the usage count is !0, so we don't need to check + * for that. + */ +static void __exit ctcm_exit(void) +{ + ccwgroup_driver_unregister(&ctcm_group_driver); + ccw_driver_unregister(&ctcm_ccw_driver); + root_device_unregister(ctcm_root_dev); + ctcm_unregister_dbf_views(); + pr_info("CTCM driver unloaded\n"); +} + +/* + * Print Banner. + */ +static void print_banner(void) +{ + pr_info("CTCM driver initialized\n"); +} + +/** + * Initialize module. + * This is called just after the module is loaded. + * + * returns 0 on success, !0 on error. + */ +static int __init ctcm_init(void) +{ + int ret; + + channels = NULL; + + ret = ctcm_register_dbf_views(); + if (ret) + goto out_err; + ctcm_root_dev = root_device_register("ctcm"); + ret = PTR_ERR_OR_ZERO(ctcm_root_dev); + if (ret) + goto register_err; + ret = ccw_driver_register(&ctcm_ccw_driver); + if (ret) + goto ccw_err; + ctcm_group_driver.driver.groups = ctcm_drv_attr_groups; + ret = ccwgroup_driver_register(&ctcm_group_driver); + if (ret) + goto ccwgroup_err; + print_banner(); + return 0; + +ccwgroup_err: + ccw_driver_unregister(&ctcm_ccw_driver); +ccw_err: + root_device_unregister(ctcm_root_dev); +register_err: + ctcm_unregister_dbf_views(); +out_err: + pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n", + __func__, ret); + return ret; +} + +module_init(ctcm_init); +module_exit(ctcm_exit); + +MODULE_AUTHOR("Peter Tiedemann "); +MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); +MODULE_LICENSE("GPL"); + diff --git a/drivers/s390/net/ctcm_main.h b/drivers/s390/net/ctcm_main.h new file mode 100644 index 000000000..16bdf23ee --- /dev/null +++ b/drivers/s390/net/ctcm_main.h @@ -0,0 +1,316 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2001, 2007 + * Authors: Fritz Elfert (felfert@millenux.com) + * Peter Tiedemann (ptiedem@de.ibm.com) + */ + +#ifndef _CTCM_MAIN_H_ +#define _CTCM_MAIN_H_ + +#include +#include + +#include +#include + +#include "fsm.h" +#include "ctcm_dbug.h" +#include "ctcm_mpc.h" + +#define CTC_DRIVER_NAME "ctcm" +#define CTC_DEVICE_NAME "ctc" +#define MPC_DEVICE_NAME "mpc" +#define CTC_DEVICE_GENE CTC_DEVICE_NAME "%d" +#define MPC_DEVICE_GENE MPC_DEVICE_NAME "%d" + +#define CHANNEL_FLAGS_READ 0 +#define CHANNEL_FLAGS_WRITE 1 +#define CHANNEL_FLAGS_INUSE 2 +#define CHANNEL_FLAGS_BUFSIZE_CHANGED 4 +#define CHANNEL_FLAGS_FAILED 8 +#define CHANNEL_FLAGS_WAITIRQ 16 +#define CHANNEL_FLAGS_RWMASK 1 +#define CHANNEL_DIRECTION(f) (f & CHANNEL_FLAGS_RWMASK) + +#define LOG_FLAG_ILLEGALPKT 1 +#define LOG_FLAG_ILLEGALSIZE 2 +#define LOG_FLAG_OVERRUN 4 +#define LOG_FLAG_NOMEM 8 + +#define ctcm_pr_debug(fmt, arg...) printk(KERN_DEBUG fmt, ##arg) + +#define CTCM_PR_DEBUG(fmt, arg...) \ + do { \ + if (do_debug) \ + printk(KERN_DEBUG fmt, ##arg); \ + } while (0) + +#define CTCM_PR_DBGDATA(fmt, arg...) \ + do { \ + if (do_debug_data) \ + printk(KERN_DEBUG fmt, ##arg); \ + } while (0) + +#define CTCM_D3_DUMP(buf, len) \ + do { \ + if (do_debug_data) \ + ctcmpc_dumpit(buf, len); \ + } while (0) + +#define CTCM_CCW_DUMP(buf, len) \ + do { \ + if (do_debug_ccw) \ + ctcmpc_dumpit(buf, len); \ + } while (0) + +/** + * Enum for classifying detected devices + */ +enum ctcm_channel_types { + /* Device is not a channel */ + ctcm_channel_type_none, + + /* Device is a CTC/A */ + ctcm_channel_type_parallel, + + /* Device is a FICON channel */ + ctcm_channel_type_ficon, + + /* Device is a ESCON channel */ + ctcm_channel_type_escon +}; + +/* + * CCW commands, used in this driver. + */ +#define CCW_CMD_WRITE 0x01 +#define CCW_CMD_READ 0x02 +#define CCW_CMD_NOOP 0x03 +#define CCW_CMD_TIC 0x08 +#define CCW_CMD_SENSE_CMD 0x14 +#define CCW_CMD_WRITE_CTL 0x17 +#define CCW_CMD_SET_EXTENDED 0xc3 +#define CCW_CMD_PREPARE 0xe3 + +#define CTCM_PROTO_S390 0 +#define CTCM_PROTO_LINUX 1 +#define CTCM_PROTO_LINUX_TTY 2 +#define CTCM_PROTO_OS390 3 +#define CTCM_PROTO_MPC 4 +#define CTCM_PROTO_MAX 4 + +#define CTCM_BUFSIZE_LIMIT 65535 +#define CTCM_BUFSIZE_DEFAULT 32768 +#define MPC_BUFSIZE_DEFAULT CTCM_BUFSIZE_LIMIT + +#define CTCM_TIME_1_SEC 1000 +#define CTCM_TIME_5_SEC 5000 +#define CTCM_TIME_10_SEC 10000 + +#define CTCM_INITIAL_BLOCKLEN 2 + +#define CTCM_READ 0 +#define CTCM_WRITE 1 + +#define CTCM_ID_SIZE 20+3 + +struct ctcm_profile { + unsigned long maxmulti; + unsigned long maxcqueue; + unsigned long doios_single; + unsigned long doios_multi; + unsigned long txlen; + unsigned long tx_time; + unsigned long send_stamp; +}; + +/* + * Definition of one channel + */ +struct channel { + struct channel *next; + char id[CTCM_ID_SIZE]; + struct ccw_device *cdev; + /* + * Type of this channel. + * CTC/A or Escon for valid channels. + */ + enum ctcm_channel_types type; + /* + * Misc. flags. See CHANNEL_FLAGS_... below + */ + __u32 flags; + __u16 protocol; /* protocol of this channel (4 = MPC) */ + /* + * I/O and irq related stuff + */ + struct ccw1 *ccw; + struct irb *irb; + /* + * RX/TX buffer size + */ + int max_bufsize; + struct sk_buff *trans_skb; /* transmit/receive buffer */ + struct sk_buff_head io_queue; /* universal I/O queue */ + struct tasklet_struct ch_tasklet; /* MPC ONLY */ + /* + * TX queue for collecting skb's during busy. + */ + struct sk_buff_head collect_queue; + /* + * Amount of data in collect_queue. + */ + int collect_len; + /* + * spinlock for collect_queue and collect_len + */ + spinlock_t collect_lock; + /* + * Timer for detecting unresposive + * I/O operations. + */ + fsm_timer timer; + /* MPC ONLY section begin */ + __u32 th_seq_num; /* SNA TH seq number */ + __u8 th_seg; + __u32 pdu_seq; + struct sk_buff *xid_skb; + char *xid_skb_data; + struct th_header *xid_th; + struct xid2 *xid; + char *xid_id; + struct th_header *rcvd_xid_th; + struct xid2 *rcvd_xid; + char *rcvd_xid_id; + __u8 in_mpcgroup; + fsm_timer sweep_timer; + struct sk_buff_head sweep_queue; + struct th_header *discontact_th; + struct tasklet_struct ch_disc_tasklet; + /* MPC ONLY section end */ + + int retry; /* retry counter for misc. operations */ + fsm_instance *fsm; /* finite state machine of this channel */ + struct net_device *netdev; /* corresponding net_device */ + struct ctcm_profile prof; + __u8 *trans_skb_data; + __u16 logflags; + __u8 sense_rc; /* last unit check sense code report control */ +}; + +struct ctcm_priv { + struct net_device_stats stats; + unsigned long tbusy; + + /* The MPC group struct of this interface */ + struct mpc_group *mpcg; /* MPC only */ + struct xid2 *xid; /* MPC only */ + + /* The finite state machine of this interface */ + fsm_instance *fsm; + + /* The protocol of this device */ + __u16 protocol; + + /* Timer for restarting after I/O Errors */ + fsm_timer restart_timer; + + int buffer_size; /* ctc only */ + + struct channel *channel[2]; +}; + +int ctcm_open(struct net_device *dev); +int ctcm_close(struct net_device *dev); + +extern const struct attribute_group *ctcm_attr_groups[]; + +/* + * Compatibility macros for busy handling + * of network devices. + */ +static inline void ctcm_clear_busy_do(struct net_device *dev) +{ + clear_bit(0, &(((struct ctcm_priv *)dev->ml_priv)->tbusy)); + netif_wake_queue(dev); +} + +static inline void ctcm_clear_busy(struct net_device *dev) +{ + struct mpc_group *grp; + grp = ((struct ctcm_priv *)dev->ml_priv)->mpcg; + + if (!(grp && grp->in_sweep)) + ctcm_clear_busy_do(dev); +} + + +static inline int ctcm_test_and_set_busy(struct net_device *dev) +{ + netif_stop_queue(dev); + return test_and_set_bit(0, + &(((struct ctcm_priv *)dev->ml_priv)->tbusy)); +} + +extern int loglevel; +extern struct channel *channels; + +void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb); + +/* + * Functions related to setup and device detection. + */ + +static inline int ctcm_less_than(char *id1, char *id2) +{ + unsigned long dev1, dev2; + + id1 = id1 + 5; + id2 = id2 + 5; + + dev1 = simple_strtoul(id1, &id1, 16); + dev2 = simple_strtoul(id2, &id2, 16); + + return (dev1 < dev2); +} + +int ctcm_ch_alloc_buffer(struct channel *ch); + +static inline int ctcm_checkalloc_buffer(struct channel *ch) +{ + if (ch->trans_skb == NULL) + return ctcm_ch_alloc_buffer(ch); + if (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED) { + dev_kfree_skb(ch->trans_skb); + return ctcm_ch_alloc_buffer(ch); + } + return 0; +} + +struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); + +/* test if protocol attribute (of struct ctcm_priv or struct channel) + * has MPC protocol setting. Type is not checked + */ +#define IS_MPC(p) ((p)->protocol == CTCM_PROTO_MPC) + +/* test if struct ctcm_priv of struct net_device has MPC protocol setting */ +#define IS_MPCDEV(dev) IS_MPC((struct ctcm_priv *)dev->ml_priv) + +static inline gfp_t gfp_type(void) +{ + return in_interrupt() ? GFP_ATOMIC : GFP_KERNEL; +} + +/* + * Definition of our link level header. + */ +struct ll_header { + __u16 length; + __u16 type; + __u16 unused; +}; +#define LL_HEADER_LENGTH (sizeof(struct ll_header)) + +#endif diff --git a/drivers/s390/net/ctcm_mpc.c b/drivers/s390/net/ctcm_mpc.c new file mode 100644 index 000000000..07d966813 --- /dev/null +++ b/drivers/s390/net/ctcm_mpc.c @@ -0,0 +1,2151 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2004, 2007 + * Authors: Belinda Thompson (belindat@us.ibm.com) + * Andy Richter (richtera@us.ibm.com) + * Peter Tiedemann (ptiedem@de.ibm.com) + */ + +/* + This module exports functions to be used by CCS: + EXPORT_SYMBOL(ctc_mpc_alloc_channel); + EXPORT_SYMBOL(ctc_mpc_establish_connectivity); + EXPORT_SYMBOL(ctc_mpc_dealloc_ch); + EXPORT_SYMBOL(ctc_mpc_flow_control); +*/ + +#undef DEBUG +#undef DEBUGDATA +#undef DEBUGCCW + +#define KMSG_COMPONENT "ctcm" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include /* instead of ok ? */ +#include +#include +#include /* instead of ok ? */ +#include /* instead of ok ? */ +#include +#include +#include + +#include "ctcm_main.h" +#include "ctcm_mpc.h" +#include "ctcm_fsms.h" + +static const struct xid2 init_xid = { + .xid2_type_id = XID_FM2, + .xid2_len = 0x45, + .xid2_adj_id = 0, + .xid2_rlen = 0x31, + .xid2_resv1 = 0, + .xid2_flag1 = 0, + .xid2_fmtt = 0, + .xid2_flag4 = 0x80, + .xid2_resv2 = 0, + .xid2_tgnum = 0, + .xid2_sender_id = 0, + .xid2_flag2 = 0, + .xid2_option = XID2_0, + .xid2_resv3 = "\x00", + .xid2_resv4 = 0, + .xid2_dlc_type = XID2_READ_SIDE, + .xid2_resv5 = 0, + .xid2_mpc_flag = 0, + .xid2_resv6 = 0, + .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35), +}; + +static const struct th_header thnorm = { + .th_seg = 0x00, + .th_ch_flag = TH_IS_XID, + .th_blk_flag = TH_DATA_IS_XID, + .th_is_xid = 0x01, + .th_seq_num = 0x00000000, +}; + +static const struct th_header thdummy = { + .th_seg = 0x00, + .th_ch_flag = 0x00, + .th_blk_flag = TH_DATA_IS_XID, + .th_is_xid = 0x01, + .th_seq_num = 0x00000000, +}; + +/* + * Definition of one MPC group + */ + +/* + * Compatibility macros for busy handling + * of network devices. + */ + +static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb); + +/* + * MPC Group state machine actions (static prototypes) + */ +static void mpc_action_nop(fsm_instance *fsm, int event, void *arg); +static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg); +static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg); +static void mpc_action_timeout(fsm_instance *fi, int event, void *arg); +static int mpc_validate_xid(struct mpcg_info *mpcginfo); +static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg); +static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg); +static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg); +static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg); +static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg); +static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg); + +#ifdef DEBUGDATA +/*-------------------------------------------------------------------* +* Dump buffer format * +* * +*--------------------------------------------------------------------*/ +void ctcmpc_dumpit(char *buf, int len) +{ + __u32 ct, sw, rm, dup; + char *ptr, *rptr; + char tbuf[82], tdup[82]; + char addr[22]; + char boff[12]; + char bhex[82], duphex[82]; + char basc[40]; + + sw = 0; + rptr = ptr = buf; + rm = 16; + duphex[0] = 0x00; + dup = 0; + + for (ct = 0; ct < len; ct++, ptr++, rptr++) { + if (sw == 0) { + sprintf(addr, "%16.16llx", (__u64)rptr); + + sprintf(boff, "%4.4X", (__u32)ct); + bhex[0] = '\0'; + basc[0] = '\0'; + } + if ((sw == 4) || (sw == 12)) + strcat(bhex, " "); + if (sw == 8) + strcat(bhex, " "); + + sprintf(tbuf, "%2.2llX", (__u64)*ptr); + + tbuf[2] = '\0'; + strcat(bhex, tbuf); + if ((0 != isprint(*ptr)) && (*ptr >= 0x20)) + basc[sw] = *ptr; + else + basc[sw] = '.'; + + basc[sw+1] = '\0'; + sw++; + rm--; + if (sw != 16) + continue; + if ((strcmp(duphex, bhex)) != 0) { + if (dup != 0) { + sprintf(tdup, + "Duplicate as above to %s", addr); + ctcm_pr_debug(" --- %s ---\n", + tdup); + } + ctcm_pr_debug(" %s (+%s) : %s [%s]\n", + addr, boff, bhex, basc); + dup = 0; + strcpy(duphex, bhex); + } else + dup++; + + sw = 0; + rm = 16; + } /* endfor */ + + if (sw != 0) { + for ( ; rm > 0; rm--, sw++) { + if ((sw == 4) || (sw == 12)) + strcat(bhex, " "); + if (sw == 8) + strcat(bhex, " "); + strcat(bhex, " "); + strcat(basc, " "); + } + if (dup != 0) { + sprintf(tdup, "Duplicate as above to %s", addr); + ctcm_pr_debug(" --- %s ---\n", tdup); + } + ctcm_pr_debug(" %s (+%s) : %s [%s]\n", + addr, boff, bhex, basc); + } else { + if (dup >= 1) { + sprintf(tdup, "Duplicate as above to %s", addr); + ctcm_pr_debug(" --- %s ---\n", tdup); + } + if (dup != 0) { + ctcm_pr_debug(" %s (+%s) : %s [%s]\n", + addr, boff, bhex, basc); + } + } + + return; + +} /* end of ctcmpc_dumpit */ +#endif + +#ifdef DEBUGDATA +/* + * Dump header and first 16 bytes of an sk_buff for debugging purposes. + * + * skb The sk_buff to dump. + * offset Offset relative to skb-data, where to start the dump. + */ +void ctcmpc_dump_skb(struct sk_buff *skb, int offset) +{ + __u8 *p = skb->data; + struct th_header *header; + struct pdu *pheader; + int bl = skb->len; + int i; + + if (p == NULL) + return; + + p += offset; + header = (struct th_header *)p; + + ctcm_pr_debug("dump:\n"); + ctcm_pr_debug("skb len=%d \n", skb->len); + if (skb->len > 2) { + switch (header->th_ch_flag) { + case TH_HAS_PDU: + break; + case 0x00: + case TH_IS_XID: + if ((header->th_blk_flag == TH_DATA_IS_XID) && + (header->th_is_xid == 0x01)) + goto dumpth; + case TH_SWEEP_REQ: + goto dumpth; + case TH_SWEEP_RESP: + goto dumpth; + default: + break; + } + + pheader = (struct pdu *)p; + ctcm_pr_debug("pdu->offset: %d hex: %04x\n", + pheader->pdu_offset, pheader->pdu_offset); + ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag); + ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto); + ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq); + goto dumpdata; + +dumpth: + ctcm_pr_debug("th->seg : %02x\n", header->th_seg); + ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag); + ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag); + ctcm_pr_debug("th->type : %s\n", + (header->th_is_xid) ? "DATA" : "XID"); + ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num); + + } +dumpdata: + if (bl > 32) + bl = 32; + ctcm_pr_debug("data: "); + for (i = 0; i < bl; i++) + ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n"); + ctcm_pr_debug("\n"); +} +#endif + +static struct net_device *ctcmpc_get_dev(int port_num) +{ + char device[20]; + struct net_device *dev; + struct ctcm_priv *priv; + + sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num); + + dev = __dev_get_by_name(&init_net, device); + + if (dev == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s: Device not found by name: %s", + CTCM_FUNTAIL, device); + return NULL; + } + priv = dev->ml_priv; + if (priv == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): dev->ml_priv is NULL", + CTCM_FUNTAIL, device); + return NULL; + } + if (priv->mpcg == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): priv->mpcg is NULL", + CTCM_FUNTAIL, device); + return NULL; + } + return dev; +} + +/* + * ctc_mpc_alloc_channel + * (exported interface) + * + * Device Initialization : + * ACTPATH driven IO operations + */ +int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) +{ + struct net_device *dev; + struct mpc_group *grp; + struct ctcm_priv *priv; + + dev = ctcmpc_get_dev(port_num); + if (dev == NULL) + return 1; + priv = dev->ml_priv; + grp = priv->mpcg; + + grp->allochanfunc = callback; + grp->port_num = port_num; + grp->port_persist = 1; + + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, + "%s(%s): state=%s", + CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_INOP: + /* Group is in the process of terminating */ + grp->alloc_called = 1; + break; + case MPCG_STATE_RESET: + /* MPC Group will transition to state */ + /* MPCG_STATE_XID2INITW iff the minimum number */ + /* of 1 read and 1 write channel have successfully*/ + /* activated */ + /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ + if (callback) + grp->send_qllc_disc = 1; + case MPCG_STATE_XID0IOWAIT: + fsm_deltimer(&grp->timer); + grp->outstanding_xid2 = 0; + grp->outstanding_xid7 = 0; + grp->outstanding_xid7_p2 = 0; + grp->saved_xid2 = NULL; + if (callback) + ctcm_open(dev); + fsm_event(priv->fsm, DEV_EVENT_START, dev); + break; + case MPCG_STATE_READY: + /* XID exchanges completed after PORT was activated */ + /* Link station already active */ + /* Maybe timing issue...retry callback */ + grp->allocchan_callback_retries++; + if (grp->allocchan_callback_retries < 4) { + if (grp->allochanfunc) + grp->allochanfunc(grp->port_num, + grp->group_max_buflen); + } else { + /* there are problems...bail out */ + /* there may be a state mismatch so restart */ + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + grp->allocchan_callback_retries = 0; + } + break; + } + + return 0; +} +EXPORT_SYMBOL(ctc_mpc_alloc_channel); + +/* + * ctc_mpc_establish_connectivity + * (exported interface) + */ +void ctc_mpc_establish_connectivity(int port_num, + void (*callback)(int, int, int)) +{ + struct net_device *dev; + struct mpc_group *grp; + struct ctcm_priv *priv; + struct channel *rch, *wch; + + dev = ctcmpc_get_dev(port_num); + if (dev == NULL) + return; + priv = dev->ml_priv; + grp = priv->mpcg; + rch = priv->channel[CTCM_READ]; + wch = priv->channel[CTCM_WRITE]; + + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, + "%s(%s): state=%s", + CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); + + grp->estconnfunc = callback; + grp->port_num = port_num; + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_READY: + /* XID exchanges completed after PORT was activated */ + /* Link station already active */ + /* Maybe timing issue...retry callback */ + fsm_deltimer(&grp->timer); + grp->estconn_callback_retries++; + if (grp->estconn_callback_retries < 4) { + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, 0, + grp->group_max_buflen); + grp->estconnfunc = NULL; + } + } else { + /* there are problems...bail out */ + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + grp->estconn_callback_retries = 0; + } + break; + case MPCG_STATE_INOP: + case MPCG_STATE_RESET: + /* MPC Group is not ready to start XID - min num of */ + /* 1 read and 1 write channel have not been acquired*/ + + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): REJECTED - inactive channels", + CTCM_FUNTAIL, dev->name); + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, -1, 0); + grp->estconnfunc = NULL; + } + break; + case MPCG_STATE_XID2INITW: + /* alloc channel was called but no XID exchange */ + /* has occurred. initiate xside XID exchange */ + /* make sure yside XID0 processing has not started */ + + if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) || + (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): ABORT - PASSIVE XID", + CTCM_FUNTAIL, dev->name); + break; + } + grp->send_qllc_disc = 1; + fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT); + fsm_deltimer(&grp->timer); + fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, + MPCG_EVENT_TIMER, dev); + grp->outstanding_xid7 = 0; + grp->outstanding_xid7_p2 = 0; + grp->saved_xid2 = NULL; + if ((rch->in_mpcgroup) && + (fsm_getstate(rch->fsm) == CH_XID0_PENDING)) + fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch); + else { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): RX-%s not ready for ACTIVE XID0", + CTCM_FUNTAIL, dev->name, rch->id); + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, -1, 0); + grp->estconnfunc = NULL; + } + fsm_deltimer(&grp->timer); + goto done; + } + if ((wch->in_mpcgroup) && + (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) + fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch); + else { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): WX-%s not ready for ACTIVE XID0", + CTCM_FUNTAIL, dev->name, wch->id); + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, -1, 0); + grp->estconnfunc = NULL; + } + fsm_deltimer(&grp->timer); + goto done; + } + break; + case MPCG_STATE_XID0IOWAIT: + /* already in active XID negotiations */ + default: + break; + } + +done: + CTCM_PR_DEBUG("Exit %s()\n", __func__); + return; +} +EXPORT_SYMBOL(ctc_mpc_establish_connectivity); + +/* + * ctc_mpc_dealloc_ch + * (exported interface) + */ +void ctc_mpc_dealloc_ch(int port_num) +{ + struct net_device *dev; + struct ctcm_priv *priv; + struct mpc_group *grp; + + dev = ctcmpc_get_dev(port_num); + if (dev == NULL) + return; + priv = dev->ml_priv; + grp = priv->mpcg; + + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, + "%s: %s: refcount = %d\n", + CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev)); + + fsm_deltimer(&priv->restart_timer); + grp->channels_terminating = 0; + fsm_deltimer(&grp->timer); + grp->allochanfunc = NULL; + grp->estconnfunc = NULL; + grp->port_persist = 0; + grp->send_qllc_disc = 0; + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + + ctcm_close(dev); + return; +} +EXPORT_SYMBOL(ctc_mpc_dealloc_ch); + +/* + * ctc_mpc_flow_control + * (exported interface) + */ +void ctc_mpc_flow_control(int port_num, int flowc) +{ + struct ctcm_priv *priv; + struct mpc_group *grp; + struct net_device *dev; + struct channel *rch; + int mpcg_state; + + dev = ctcmpc_get_dev(port_num); + if (dev == NULL) + return; + priv = dev->ml_priv; + grp = priv->mpcg; + + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, + "%s: %s: flowc = %d", + CTCM_FUNTAIL, dev->name, flowc); + + rch = priv->channel[CTCM_READ]; + + mpcg_state = fsm_getstate(grp->fsm); + switch (flowc) { + case 1: + if (mpcg_state == MPCG_STATE_FLOWC) + break; + if (mpcg_state == MPCG_STATE_READY) { + if (grp->flow_off_called == 1) + grp->flow_off_called = 0; + else + fsm_newstate(grp->fsm, MPCG_STATE_FLOWC); + break; + } + break; + case 0: + if (mpcg_state == MPCG_STATE_FLOWC) { + fsm_newstate(grp->fsm, MPCG_STATE_READY); + /* ensure any data that has accumulated */ + /* on the io_queue will now be sen t */ + tasklet_schedule(&rch->ch_tasklet); + } + /* possible race condition */ + if (mpcg_state == MPCG_STATE_READY) { + grp->flow_off_called = 1; + break; + } + break; + } + +} +EXPORT_SYMBOL(ctc_mpc_flow_control); + +static int mpc_send_qllc_discontact(struct net_device *); + +/* + * helper function of ctcmpc_unpack_skb +*/ +static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) +{ + struct channel *rch = mpcginfo->ch; + struct net_device *dev = rch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct channel *ch = priv->channel[CTCM_WRITE]; + + CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id); + CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); + + grp->sweep_rsp_pend_num--; + + if ((grp->sweep_req_pend_num == 0) && + (grp->sweep_rsp_pend_num == 0)) { + fsm_deltimer(&ch->sweep_timer); + grp->in_sweep = 0; + rch->th_seq_num = 0x00; + ch->th_seq_num = 0x00; + ctcm_clear_busy_do(dev); + } + + return; + +} + +/* + * helper function of mpc_rcvd_sweep_req + * which is a helper of ctcmpc_unpack_skb + */ +static void ctcmpc_send_sweep_resp(struct channel *rch) +{ + struct net_device *dev = rch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct th_sweep *header; + struct sk_buff *sweep_skb; + struct channel *ch = priv->channel[CTCM_WRITE]; + + CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id); + + sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); + if (sweep_skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): sweep_skb allocation ERROR\n", + CTCM_FUNTAIL, rch->id); + goto done; + } + + header = kmalloc(sizeof(struct th_sweep), gfp_type()); + + if (!header) { + dev_kfree_skb_any(sweep_skb); + goto done; + } + + header->th.th_seg = 0x00 ; + header->th.th_ch_flag = TH_SWEEP_RESP; + header->th.th_blk_flag = 0x00; + header->th.th_is_xid = 0x00; + header->th.th_seq_num = 0x00; + header->sw.th_last_seq = ch->th_seq_num; + + skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH); + + kfree(header); + + netif_trans_update(dev); + skb_queue_tail(&ch->sweep_queue, sweep_skb); + + fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); + + return; + +done: + grp->in_sweep = 0; + ctcm_clear_busy_do(dev); + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + + return; +} + +/* + * helper function of ctcmpc_unpack_skb + */ +static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) +{ + struct channel *rch = mpcginfo->ch; + struct net_device *dev = rch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct channel *ch = priv->channel[CTCM_WRITE]; + + if (do_debug) + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, + " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); + + if (grp->in_sweep == 0) { + grp->in_sweep = 1; + ctcm_test_and_set_busy(dev); + grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; + grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; + } + + CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); + + grp->sweep_req_pend_num--; + ctcmpc_send_sweep_resp(ch); + kfree(mpcginfo); + return; +} + +/* + * MPC Group Station FSM definitions + */ +static const char *mpcg_event_names[] = { + [MPCG_EVENT_INOP] = "INOP Condition", + [MPCG_EVENT_DISCONC] = "Discontact Received", + [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", + [MPCG_EVENT_XID2] = "XID2 Received", + [MPCG_EVENT_XID2DONE] = "XID0 Complete", + [MPCG_EVENT_XID7DONE] = "XID7 Complete", + [MPCG_EVENT_TIMER] = "XID Setup Timer", + [MPCG_EVENT_DOIO] = "XID DoIO", +}; + +static const char *mpcg_state_names[] = { + [MPCG_STATE_RESET] = "Reset", + [MPCG_STATE_INOP] = "INOP", + [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", + [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", + [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", + [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", + [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", + [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", + [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", + [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", + [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", + [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", + [MPCG_STATE_READY] = "READY", +}; + +/* + * The MPC Group Station FSM + * 22 events + */ +static const fsm_node mpcg_fsm[] = { + { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, + { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, + + { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, + + { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, + { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, + { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, + + { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, + { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, + { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, + + { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, + + { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, + { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, + + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, + + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, + + { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, + + { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, + { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, + + { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, +}; + +static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + if (grp == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): No MPC group", + CTCM_FUNTAIL, dev->name); + return; + } + + fsm_deltimer(&grp->timer); + + if (grp->saved_xid2->xid2_flag2 == 0x40) { + priv->xid->xid2_flag2 = 0x00; + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, 1, + grp->group_max_buflen); + grp->estconnfunc = NULL; + } else if (grp->allochanfunc) + grp->send_qllc_disc = 1; + + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): fails", + CTCM_FUNTAIL, dev->name); + return; + } + + grp->port_persist = 1; + grp->out_of_sequence = 0; + grp->estconn_called = 0; + + tasklet_hi_schedule(&grp->mpc_tasklet2); + + return; +} + +/* + * helper of ctcm_init_netdevice + * CTCM_PROTO_MPC only + */ +void mpc_group_ready(unsigned long adev) +{ + struct net_device *dev = (struct net_device *)adev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct channel *ch = NULL; + + if (grp == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): No MPC group", + CTCM_FUNTAIL, dev->name); + return; + } + + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, + "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", + CTCM_FUNTAIL, dev->name, grp->group_max_buflen); + + fsm_newstate(grp->fsm, MPCG_STATE_READY); + + /* Put up a read on the channel */ + ch = priv->channel[CTCM_READ]; + ch->pdu_seq = 0; + CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , + __func__, ch->pdu_seq); + + ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); + /* Put the write channel in idle state */ + ch = priv->channel[CTCM_WRITE]; + if (ch->collect_len > 0) { + spin_lock(&ch->collect_lock); + ctcm_purge_skb_queue(&ch->collect_queue); + ch->collect_len = 0; + spin_unlock(&ch->collect_lock); + } + ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); + ctcm_clear_busy(dev); + + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, 0, + grp->group_max_buflen); + grp->estconnfunc = NULL; + } else if (grp->allochanfunc) + grp->allochanfunc(grp->port_num, grp->group_max_buflen); + + grp->send_qllc_disc = 1; + grp->changed_side = 0; + + return; + +} + +/* + * Increment the MPC Group Active Channel Counts + * helper of dev_action (called from channel fsm) + */ +void mpc_channel_action(struct channel *ch, int direction, int action) +{ + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + if (grp == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): No MPC group", + CTCM_FUNTAIL, dev->name); + return; + } + + CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); + + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, + "%s: %i / Grp:%s total_channels=%i, active_channels: " + "read=%i, write=%i\n", __func__, action, + fsm_getstate_str(grp->fsm), grp->num_channel_paths, + grp->active_channels[CTCM_READ], + grp->active_channels[CTCM_WRITE]); + + if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { + grp->num_channel_paths++; + grp->active_channels[direction]++; + grp->outstanding_xid2++; + ch->in_mpcgroup = 1; + + if (ch->xid_skb != NULL) + dev_kfree_skb_any(ch->xid_skb); + + ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, + GFP_ATOMIC | GFP_DMA); + if (ch->xid_skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): Couldn't alloc ch xid_skb\n", + CTCM_FUNTAIL, dev->name); + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + return; + } + ch->xid_skb_data = ch->xid_skb->data; + ch->xid_th = (struct th_header *)ch->xid_skb->data; + skb_put(ch->xid_skb, TH_HEADER_LENGTH); + ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); + skb_put(ch->xid_skb, XID2_LENGTH); + ch->xid_id = skb_tail_pointer(ch->xid_skb); + ch->xid_skb->data = ch->xid_skb_data; + skb_reset_tail_pointer(ch->xid_skb); + ch->xid_skb->len = 0; + + skb_put_data(ch->xid_skb, grp->xid_skb->data, + grp->xid_skb->len); + + ch->xid->xid2_dlc_type = + ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) + ? XID2_READ_SIDE : XID2_WRITE_SIDE); + + if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) + ch->xid->xid2_buf_len = 0x00; + + ch->xid_skb->data = ch->xid_skb_data; + skb_reset_tail_pointer(ch->xid_skb); + ch->xid_skb->len = 0; + + fsm_newstate(ch->fsm, CH_XID0_PENDING); + + if ((grp->active_channels[CTCM_READ] > 0) && + (grp->active_channels[CTCM_WRITE] > 0) && + (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { + fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, + "%s: %s: MPC GROUP CHANNELS ACTIVE\n", + __func__, dev->name); + } + } else if ((action == MPC_CHANNEL_REMOVE) && + (ch->in_mpcgroup == 1)) { + ch->in_mpcgroup = 0; + grp->num_channel_paths--; + grp->active_channels[direction]--; + + if (ch->xid_skb != NULL) + dev_kfree_skb_any(ch->xid_skb); + ch->xid_skb = NULL; + + if (grp->channels_terminating) + goto done; + + if (((grp->active_channels[CTCM_READ] == 0) && + (grp->active_channels[CTCM_WRITE] > 0)) + || ((grp->active_channels[CTCM_WRITE] == 0) && + (grp->active_channels[CTCM_READ] > 0))) + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + } +done: + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, + "exit %s: %i / Grp:%s total_channels=%i, active_channels: " + "read=%i, write=%i\n", __func__, action, + fsm_getstate_str(grp->fsm), grp->num_channel_paths, + grp->active_channels[CTCM_READ], + grp->active_channels[CTCM_WRITE]); + + CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); +} + +/** + * Unpack a just received skb and hand it over to + * upper layers. + * special MPC version of unpack_skb. + * + * ch The channel where this skb has been received. + * pskb The received skb. + */ +static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) +{ + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct pdu *curr_pdu; + struct mpcg_info *mpcginfo; + struct th_header *header = NULL; + struct th_sweep *sweep = NULL; + int pdu_last_seen = 0; + __u32 new_len; + struct sk_buff *skb; + int skblen; + int sendrc = 0; + + CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", + __func__, dev->name, smp_processor_id(), ch->id); + + header = (struct th_header *)pskb->data; + if ((header->th_seg == 0) && + (header->th_ch_flag == 0) && + (header->th_blk_flag == 0) && + (header->th_seq_num == 0)) + /* nothing for us */ goto done; + + CTCM_PR_DBGDATA("%s: th_header\n", __func__); + CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); + CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); + + pskb->dev = dev; + pskb->ip_summed = CHECKSUM_UNNECESSARY; + skb_pull(pskb, TH_HEADER_LENGTH); + + if (likely(header->th_ch_flag == TH_HAS_PDU)) { + CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); + if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || + ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && + (header->th_seq_num != ch->th_seq_num + 1) && + (ch->th_seq_num != 0))) { + /* This is NOT the next segment * + * we are not the correct race winner * + * go away and let someone else win * + * BUT..this only applies if xid negot * + * is done * + */ + grp->out_of_sequence += 1; + __skb_push(pskb, TH_HEADER_LENGTH); + skb_queue_tail(&ch->io_queue, pskb); + CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " + "got:%08x\n", __func__, + ch->th_seq_num + 1, header->th_seq_num); + + return; + } + grp->out_of_sequence = 0; + ch->th_seq_num = header->th_seq_num; + + CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", + __func__, ch->th_seq_num); + + if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) + goto done; + while ((pskb->len > 0) && !pdu_last_seen) { + curr_pdu = (struct pdu *)pskb->data; + + CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); + CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); + CTCM_PR_DBGDATA("%s: pskb len: %04x \n", + __func__, pskb->len); + + skb_pull(pskb, PDU_HEADER_LENGTH); + + if (curr_pdu->pdu_flag & PDU_LAST) + pdu_last_seen = 1; + if (curr_pdu->pdu_flag & PDU_CNTL) + pskb->protocol = htons(ETH_P_SNAP); + else + pskb->protocol = htons(ETH_P_SNA_DIX); + + if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): Dropping packet with " + "illegal siize %d", + CTCM_FUNTAIL, dev->name, pskb->len); + + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + goto done; + } + skb_reset_mac_header(pskb); + new_len = curr_pdu->pdu_offset; + CTCM_PR_DBGDATA("%s: new_len: %04x \n", + __func__, new_len); + if ((new_len == 0) || (new_len > pskb->len)) { + /* should never happen */ + /* pskb len must be hosed...bail out */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): non valid pdu_offset: %04x", + /* "data may be lost", */ + CTCM_FUNTAIL, dev->name, new_len); + goto done; + } + skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); + + if (!skb) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): MEMORY allocation error", + CTCM_FUNTAIL, dev->name); + priv->stats.rx_dropped++; + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + } + skb_put_data(skb, pskb->data, new_len); + + skb_reset_mac_header(skb); + skb->dev = pskb->dev; + skb->protocol = pskb->protocol; + skb->ip_summed = CHECKSUM_UNNECESSARY; + *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; + ch->pdu_seq++; + + if (do_debug_data) { + ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", + __func__, ch->pdu_seq); + ctcm_pr_debug("%s: skb:%0lx " + "skb len: %d \n", __func__, + (unsigned long)skb, skb->len); + ctcm_pr_debug("%s: up to 32 bytes " + "of pdu_data sent\n", __func__); + ctcmpc_dump32((char *)skb->data, skb->len); + } + + skblen = skb->len; + sendrc = netif_rx(skb); + priv->stats.rx_packets++; + priv->stats.rx_bytes += skblen; + skb_pull(pskb, new_len); /* point to next PDU */ + } + } else { + mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type()); + if (mpcginfo == NULL) + goto done; + + mpcginfo->ch = ch; + mpcginfo->th = header; + mpcginfo->skb = pskb; + CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", + __func__); + /* it's a sweep? */ + sweep = (struct th_sweep *)pskb->data; + mpcginfo->sweep = sweep; + if (header->th_ch_flag == TH_SWEEP_REQ) + mpc_rcvd_sweep_req(mpcginfo); + else if (header->th_ch_flag == TH_SWEEP_RESP) + mpc_rcvd_sweep_resp(mpcginfo); + else if (header->th_blk_flag == TH_DATA_IS_XID) { + struct xid2 *thisxid = (struct xid2 *)pskb->data; + skb_pull(pskb, XID2_LENGTH); + mpcginfo->xid = thisxid; + fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); + } else if (header->th_blk_flag == TH_DISCONTACT) + fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); + else if (header->th_seq_num != 0) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): control pkt expected\n", + CTCM_FUNTAIL, dev->name); + priv->stats.rx_dropped++; + /* mpcginfo only used for non-data transfers */ + if (do_debug_data) + ctcmpc_dump_skb(pskb, -8); + } + kfree(mpcginfo); + } +done: + + dev_kfree_skb_any(pskb); + if (sendrc == NET_RX_DROP) { + dev_warn(&dev->dev, + "The network backlog for %s is exceeded, " + "package dropped\n", __func__); + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + } + + CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", + __func__, dev->name, ch, ch->id); +} + +/** + * tasklet helper for mpc's skb unpacking. + * + * ch The channel to work on. + * Allow flow control back pressure to occur here. + * Throttling back channel can result in excessive + * channel inactivity and system deact of channel + */ +void ctcmpc_bh(unsigned long thischan) +{ + struct channel *ch = (struct channel *)thischan; + struct sk_buff *skb; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", + dev->name, smp_processor_id(), __func__, ch->id); + /* caller has requested driver to throttle back */ + while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && + (skb = skb_dequeue(&ch->io_queue))) { + ctcmpc_unpack_skb(ch, skb); + if (grp->out_of_sequence > 20) { + /* assume data loss has occurred if */ + /* missing seq_num for extended */ + /* period of time */ + grp->out_of_sequence = 0; + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + break; + } + if (skb == skb_peek(&ch->io_queue)) + break; + } + CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", + __func__, dev->name, ch, ch->id); + return; +} + +/* + * MPC Group Initializations + */ +struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) +{ + struct mpc_group *grp; + + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, + "Enter %s(%p)", CTCM_FUNTAIL, priv); + + grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); + if (grp == NULL) + return NULL; + + grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, + MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, + mpcg_fsm_len, GFP_KERNEL); + if (grp->fsm == NULL) { + kfree(grp); + return NULL; + } + + fsm_newstate(grp->fsm, MPCG_STATE_RESET); + fsm_settimer(grp->fsm, &grp->timer); + + grp->xid_skb = + __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); + if (grp->xid_skb == NULL) { + kfree_fsm(grp->fsm); + kfree(grp); + return NULL; + } + /* base xid for all channels in group */ + grp->xid_skb_data = grp->xid_skb->data; + grp->xid_th = (struct th_header *)grp->xid_skb->data; + skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH); + + grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); + skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH); + grp->xid->xid2_adj_id = jiffies | 0xfff00000; + grp->xid->xid2_sender_id = jiffies; + + grp->xid_id = skb_tail_pointer(grp->xid_skb); + skb_put_data(grp->xid_skb, "VTAM", 4); + + grp->rcvd_xid_skb = + __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); + if (grp->rcvd_xid_skb == NULL) { + kfree_fsm(grp->fsm); + dev_kfree_skb(grp->xid_skb); + kfree(grp); + return NULL; + } + grp->rcvd_xid_data = grp->rcvd_xid_skb->data; + grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; + skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); + grp->saved_xid2 = NULL; + priv->xid = grp->xid; + priv->mpcg = grp; + return grp; +} + +/* + * The MPC Group Station FSM + */ + +/* + * MPC Group Station FSM actions + * CTCM_PROTO_MPC only + */ + +/** + * NOP action for statemachines + */ +static void mpc_action_nop(fsm_instance *fi, int event, void *arg) +{ +} + +/* + * invoked when the device transitions to dev_stopped + * MPC will stop each individual channel if a single XID failure + * occurs, or will intitiate all channels be stopped if a GROUP + * level failure occurs. + */ +static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv; + struct mpc_group *grp; + struct channel *wch; + + CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); + + priv = dev->ml_priv; + grp = priv->mpcg; + grp->flow_off_called = 0; + fsm_deltimer(&grp->timer); + if (grp->channels_terminating) + return; + + grp->channels_terminating = 1; + grp->saved_state = fsm_getstate(grp->fsm); + fsm_newstate(grp->fsm, MPCG_STATE_INOP); + if (grp->saved_state > MPCG_STATE_XID7INITF) + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, + "%s(%s): MPC GROUP INOPERATIVE", + CTCM_FUNTAIL, dev->name); + if ((grp->saved_state != MPCG_STATE_RESET) || + /* dealloc_channel has been called */ + (grp->port_persist == 0)) + fsm_deltimer(&priv->restart_timer); + + wch = priv->channel[CTCM_WRITE]; + + switch (grp->saved_state) { + case MPCG_STATE_RESET: + case MPCG_STATE_INOP: + case MPCG_STATE_XID2INITW: + case MPCG_STATE_XID0IOWAIT: + case MPCG_STATE_XID2INITX: + case MPCG_STATE_XID7INITW: + case MPCG_STATE_XID7INITX: + case MPCG_STATE_XID0IOWAIX: + case MPCG_STATE_XID7INITI: + case MPCG_STATE_XID7INITZ: + case MPCG_STATE_XID7INITF: + break; + case MPCG_STATE_FLOWC: + case MPCG_STATE_READY: + default: + tasklet_hi_schedule(&wch->ch_disc_tasklet); + } + + grp->xid2_tgnum = 0; + grp->group_max_buflen = 0; /*min of all received */ + grp->outstanding_xid2 = 0; + grp->outstanding_xid7 = 0; + grp->outstanding_xid7_p2 = 0; + grp->saved_xid2 = NULL; + grp->xidnogood = 0; + grp->changed_side = 0; + + grp->rcvd_xid_skb->data = grp->rcvd_xid_data; + skb_reset_tail_pointer(grp->rcvd_xid_skb); + grp->rcvd_xid_skb->len = 0; + grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; + skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); + + if (grp->send_qllc_disc == 1) { + grp->send_qllc_disc = 0; + mpc_send_qllc_discontact(dev); + } + + /* DO NOT issue DEV_EVENT_STOP directly out of this code */ + /* This can result in INOP of VTAM PU due to halting of */ + /* outstanding IO which causes a sense to be returned */ + /* Only about 3 senses are allowed and then IOS/VTAM will*/ + /* become unreachable without manual intervention */ + if ((grp->port_persist == 1) || (grp->alloc_called)) { + grp->alloc_called = 0; + fsm_deltimer(&priv->restart_timer); + fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); + fsm_newstate(grp->fsm, MPCG_STATE_RESET); + if (grp->saved_state > MPCG_STATE_XID7INITF) + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, + "%s(%s): MPC GROUP RECOVERY SCHEDULED", + CTCM_FUNTAIL, dev->name); + } else { + fsm_deltimer(&priv->restart_timer); + fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); + fsm_newstate(grp->fsm, MPCG_STATE_RESET); + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, + "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", + CTCM_FUNTAIL, dev->name); + } +} + +/** + * Handle mpc group action timeout. + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + * + * fi An instance of an mpc_group fsm. + * event The event, just happened. + * arg Generic pointer, casted from net_device * upon call. + */ +static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv; + struct mpc_group *grp; + struct channel *wch; + struct channel *rch; + + priv = dev->ml_priv; + grp = priv->mpcg; + wch = priv->channel[CTCM_WRITE]; + rch = priv->channel[CTCM_READ]; + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID2INITW: + /* Unless there is outstanding IO on the */ + /* channel just return and wait for ATTN */ + /* interrupt to begin XID negotiations */ + if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && + (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) + break; + default: + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + } + + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, + "%s: dev=%s exit", + CTCM_FUNTAIL, dev->name); + return; +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +void mpc_action_discontact(fsm_instance *fi, int event, void *arg) +{ + struct mpcg_info *mpcginfo = arg; + struct channel *ch = mpcginfo->ch; + struct net_device *dev; + struct ctcm_priv *priv; + struct mpc_group *grp; + + if (ch) { + dev = ch->netdev; + if (dev) { + priv = dev->ml_priv; + if (priv) { + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, + "%s: %s: %s\n", + CTCM_FUNTAIL, dev->name, ch->id); + grp = priv->mpcg; + grp->send_qllc_disc = 1; + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + } + } + } + + return; +} + +/* + * MPC Group Station - not part of FSM + * CTCM_PROTO_MPC only + * called from add_channel in ctcm_main.c + */ +void mpc_action_send_discontact(unsigned long thischan) +{ + int rc; + struct channel *ch = (struct channel *)thischan; + unsigned long saveflags = 0; + + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + rc = ccw_device_start(ch->cdev, &ch->ccw[15], + (unsigned long)ch, 0xff, 0); + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + + if (rc != 0) { + ctcm_ccw_check_rc(ch, rc, (char *)__func__); + } + + return; +} + + +/* + * helper function of mpc FSM + * CTCM_PROTO_MPC only + * mpc_action_rcvd_xid7 +*/ +static int mpc_validate_xid(struct mpcg_info *mpcginfo) +{ + struct channel *ch = mpcginfo->ch; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct xid2 *xid = mpcginfo->xid; + int rc = 0; + __u64 our_id = 0; + __u64 their_id = 0; + int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; + + CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); + + if (xid == NULL) { + rc = 1; + /* XID REJECTED: xid == NULL */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): xid = NULL", + CTCM_FUNTAIL, ch->id); + goto done; + } + + CTCM_D3_DUMP((char *)xid, XID2_LENGTH); + + /*the received direction should be the opposite of ours */ + if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : + XID2_READ_SIDE) != xid->xid2_dlc_type) { + rc = 2; + /* XID REJECTED: r/w channel pairing mismatch */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): r/w channel pairing mismatch", + CTCM_FUNTAIL, ch->id); + goto done; + } + + if (xid->xid2_dlc_type == XID2_READ_SIDE) { + CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, + grp->group_max_buflen, xid->xid2_buf_len); + + if (grp->group_max_buflen == 0 || grp->group_max_buflen > + xid->xid2_buf_len - len) + grp->group_max_buflen = xid->xid2_buf_len - len; + } + + if (grp->saved_xid2 == NULL) { + grp->saved_xid2 = + (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); + + skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH); + grp->rcvd_xid_skb->data = grp->rcvd_xid_data; + + skb_reset_tail_pointer(grp->rcvd_xid_skb); + grp->rcvd_xid_skb->len = 0; + + /* convert two 32 bit numbers into 1 64 bit for id compare */ + our_id = (__u64)priv->xid->xid2_adj_id; + our_id = our_id << 32; + our_id = our_id + priv->xid->xid2_sender_id; + their_id = (__u64)xid->xid2_adj_id; + their_id = their_id << 32; + their_id = their_id + xid->xid2_sender_id; + /* lower id assume the xside role */ + if (our_id < their_id) { + grp->roll = XSIDE; + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, + "%s(%s): WE HAVE LOW ID - TAKE XSIDE", + CTCM_FUNTAIL, ch->id); + } else { + grp->roll = YSIDE; + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, + "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", + CTCM_FUNTAIL, ch->id); + } + + } else { + if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { + rc = 3; + /* XID REJECTED: xid flag byte4 mismatch */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): xid flag byte4 mismatch", + CTCM_FUNTAIL, ch->id); + } + if (xid->xid2_flag2 == 0x40) { + rc = 4; + /* XID REJECTED - xid NOGOOD */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): xid NOGOOD", + CTCM_FUNTAIL, ch->id); + } + if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { + rc = 5; + /* XID REJECTED - Adjacent Station ID Mismatch */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): Adjacent Station ID Mismatch", + CTCM_FUNTAIL, ch->id); + } + if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { + rc = 6; + /* XID REJECTED - Sender Address Mismatch */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): Sender Address Mismatch", + CTCM_FUNTAIL, ch->id); + } + } +done: + if (rc) { + dev_warn(&dev->dev, + "The XID used in the MPC protocol is not valid, " + "rc = %d\n", rc); + priv->xid->xid2_flag2 = 0x40; + grp->saved_xid2->xid2_flag2 = 0x40; + } + + return rc; +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) +{ + struct channel *ch = arg; + int rc = 0; + int gotlock = 0; + unsigned long saveflags = 0; /* avoids compiler warning with + spin_unlock_irqrestore */ + + CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ch, ch->id); + + if (ctcm_checkalloc_buffer(ch)) + goto done; + + /* + * skb data-buffer referencing: + */ + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + /* result of the previous 3 statements is NOT always + * already set after ctcm_checkalloc_buffer + * because of possible reuse of the trans_skb + */ + memset(ch->trans_skb->data, 0, 16); + ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; + /* check is main purpose here: */ + skb_put(ch->trans_skb, TH_HEADER_LENGTH); + ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); + /* check is main purpose here: */ + skb_put(ch->trans_skb, XID2_LENGTH); + ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); + /* cleanup back to startpoint */ + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + + /* non-checking rewrite of above skb data-buffer referencing: */ + /* + memset(ch->trans_skb->data, 0, 16); + ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; + ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); + ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; + */ + + ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[8].count = 0; + ch->ccw[8].cda = 0x00; + + if (!(ch->xid_th && ch->xid && ch->xid_id)) + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, + "%s(%s): xid_th=%p, xid=%p, xid_id=%p", + CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); + + if (side == XSIDE) { + /* mpc_action_xside_xid */ + if (ch->xid_th == NULL) + goto done; + ch->ccw[9].cmd_code = CCW_CMD_WRITE; + ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[9].count = TH_HEADER_LENGTH; + ch->ccw[9].cda = virt_to_phys(ch->xid_th); + + if (ch->xid == NULL) + goto done; + ch->ccw[10].cmd_code = CCW_CMD_WRITE; + ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[10].count = XID2_LENGTH; + ch->ccw[10].cda = virt_to_phys(ch->xid); + + ch->ccw[11].cmd_code = CCW_CMD_READ; + ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[11].count = TH_HEADER_LENGTH; + ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); + + ch->ccw[12].cmd_code = CCW_CMD_READ; + ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[12].count = XID2_LENGTH; + ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); + + ch->ccw[13].cmd_code = CCW_CMD_READ; + ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); + + } else { /* side == YSIDE : mpc_action_yside_xid */ + ch->ccw[9].cmd_code = CCW_CMD_READ; + ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[9].count = TH_HEADER_LENGTH; + ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); + + ch->ccw[10].cmd_code = CCW_CMD_READ; + ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[10].count = XID2_LENGTH; + ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); + + if (ch->xid_th == NULL) + goto done; + ch->ccw[11].cmd_code = CCW_CMD_WRITE; + ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[11].count = TH_HEADER_LENGTH; + ch->ccw[11].cda = virt_to_phys(ch->xid_th); + + if (ch->xid == NULL) + goto done; + ch->ccw[12].cmd_code = CCW_CMD_WRITE; + ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[12].count = XID2_LENGTH; + ch->ccw[12].cda = virt_to_phys(ch->xid); + + if (ch->xid_id == NULL) + goto done; + ch->ccw[13].cmd_code = CCW_CMD_WRITE; + ch->ccw[13].cda = virt_to_phys(ch->xid_id); + + } + ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[13].count = 4; + + ch->ccw[14].cmd_code = CCW_CMD_NOOP; + ch->ccw[14].flags = CCW_FLAG_SLI; + ch->ccw[14].count = 0; + ch->ccw[14].cda = 0; + + CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); + CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); + CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); + CTCM_D3_DUMP((char *)ch->xid_id, 4); + + if (!in_irq()) { + /* Such conditional locking is a known problem for + * sparse because its static undeterministic. + * Warnings should be ignored here. */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + gotlock = 1; + } + + fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); + rc = ccw_device_start(ch->cdev, &ch->ccw[8], + (unsigned long)ch, 0xff, 0); + + if (gotlock) /* see remark above about conditional locking */ + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + + if (rc != 0) { + ctcm_ccw_check_rc(ch, rc, + (side == XSIDE) ? "x-side XID" : "y-side XID"); + } + +done: + CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", + __func__, ch, ch->id); + return; + +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) +{ + mpc_action_side_xid(fsm, arg, XSIDE); +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) +{ + mpc_action_side_xid(fsm, arg, YSIDE); +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ch, ch->id); + + if (ch->xid == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): ch->xid == NULL", + CTCM_FUNTAIL, dev->name); + return; + } + + fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); + + ch->xid->xid2_option = XID2_0; + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID2INITW: + case MPCG_STATE_XID2INITX: + ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; + break; + case MPCG_STATE_XID0IOWAIT: + case MPCG_STATE_XID0IOWAIX: + ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; + break; + } + + fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); + + return; +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only +*/ +static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = NULL; + int direction; + int send = 0; + + if (priv) + grp = priv->mpcg; + if (grp == NULL) + return; + + for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { + struct channel *ch = priv->channel[direction]; + struct xid2 *thisxid = ch->xid; + ch->xid_skb->data = ch->xid_skb_data; + skb_reset_tail_pointer(ch->xid_skb); + ch->xid_skb->len = 0; + thisxid->xid2_option = XID2_7; + send = 0; + + /* xid7 phase 1 */ + if (grp->outstanding_xid7_p2 > 0) { + if (grp->roll == YSIDE) { + if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { + fsm_newstate(ch->fsm, CH_XID7_PENDING2); + ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; + skb_put_data(ch->xid_skb, &thdummy, + TH_HEADER_LENGTH); + send = 1; + } + } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { + fsm_newstate(ch->fsm, CH_XID7_PENDING2); + ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; + skb_put_data(ch->xid_skb, &thnorm, + TH_HEADER_LENGTH); + send = 1; + } + } else { + /* xid7 phase 2 */ + if (grp->roll == YSIDE) { + if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { + fsm_newstate(ch->fsm, CH_XID7_PENDING4); + skb_put_data(ch->xid_skb, &thnorm, + TH_HEADER_LENGTH); + ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; + send = 1; + } + } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { + fsm_newstate(ch->fsm, CH_XID7_PENDING4); + ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; + skb_put_data(ch->xid_skb, &thdummy, + TH_HEADER_LENGTH); + send = 1; + } + } + + if (send) + fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); + } + + return; +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) +{ + + struct mpcg_info *mpcginfo = arg; + struct channel *ch = mpcginfo->ch; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", + __func__, ch->id, grp->outstanding_xid2, + grp->outstanding_xid7, grp->outstanding_xid7_p2); + + if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) + fsm_newstate(ch->fsm, CH_XID7_PENDING); + + grp->outstanding_xid2--; + grp->outstanding_xid7++; + grp->outstanding_xid7_p2++; + + /* must change state before validating xid to */ + /* properly handle interim interrupts received*/ + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID2INITW: + fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); + mpc_validate_xid(mpcginfo); + break; + case MPCG_STATE_XID0IOWAIT: + fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); + mpc_validate_xid(mpcginfo); + break; + case MPCG_STATE_XID2INITX: + if (grp->outstanding_xid2 == 0) { + fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); + mpc_validate_xid(mpcginfo); + fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); + } + break; + case MPCG_STATE_XID0IOWAIX: + if (grp->outstanding_xid2 == 0) { + fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); + mpc_validate_xid(mpcginfo); + fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); + } + break; + } + + CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", + __func__, ch->id, grp->outstanding_xid2, + grp->outstanding_xid7, grp->outstanding_xid7_p2); + CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", + __func__, ch->id, + fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); + return; + +} + + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) +{ + struct mpcg_info *mpcginfo = arg; + struct channel *ch = mpcginfo->ch; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ch, ch->id); + CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", + __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); + + grp->outstanding_xid7--; + ch->xid_skb->data = ch->xid_skb_data; + skb_reset_tail_pointer(ch->xid_skb); + ch->xid_skb->len = 0; + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID7INITI: + fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); + mpc_validate_xid(mpcginfo); + break; + case MPCG_STATE_XID7INITW: + fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); + mpc_validate_xid(mpcginfo); + break; + case MPCG_STATE_XID7INITZ: + case MPCG_STATE_XID7INITX: + if (grp->outstanding_xid7 == 0) { + if (grp->outstanding_xid7_p2 > 0) { + grp->outstanding_xid7 = + grp->outstanding_xid7_p2; + grp->outstanding_xid7_p2 = 0; + } else + fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); + + mpc_validate_xid(mpcginfo); + fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); + break; + } + mpc_validate_xid(mpcginfo); + break; + } + return; +} + +/* + * mpc_action helper of an MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static int mpc_send_qllc_discontact(struct net_device *dev) +{ + __u32 new_len = 0; + struct sk_buff *skb; + struct qllc *qllcptr; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", + __func__, mpcg_state_names[grp->saved_state]); + + switch (grp->saved_state) { + /* + * establish conn callback function is + * preferred method to report failure + */ + case MPCG_STATE_XID0IOWAIT: + case MPCG_STATE_XID0IOWAIX: + case MPCG_STATE_XID7INITI: + case MPCG_STATE_XID7INITZ: + case MPCG_STATE_XID2INITW: + case MPCG_STATE_XID2INITX: + case MPCG_STATE_XID7INITW: + case MPCG_STATE_XID7INITX: + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, -1, 0); + grp->estconnfunc = NULL; + break; + } + case MPCG_STATE_FLOWC: + case MPCG_STATE_READY: + grp->send_qllc_disc = 2; + new_len = sizeof(struct qllc); + qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA); + if (qllcptr == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): qllcptr allocation error", + CTCM_FUNTAIL, dev->name); + return -ENOMEM; + } + + qllcptr->qllc_address = 0xcc; + qllcptr->qllc_commands = 0x03; + + skb = __dev_alloc_skb(new_len, GFP_ATOMIC); + + if (skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): skb allocation error", + CTCM_FUNTAIL, dev->name); + priv->stats.rx_dropped++; + kfree(qllcptr); + return -ENOMEM; + } + + skb_put_data(skb, qllcptr, new_len); + kfree(qllcptr); + + if (skb_headroom(skb) < 4) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): skb_headroom error", + CTCM_FUNTAIL, dev->name); + dev_kfree_skb_any(skb); + return -ENOMEM; + } + + *((__u32 *)skb_push(skb, 4)) = + priv->channel[CTCM_READ]->pdu_seq; + priv->channel[CTCM_READ]->pdu_seq++; + CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", + __func__, priv->channel[CTCM_READ]->pdu_seq); + + /* receipt of CC03 resets anticipated sequence number on + receiving side */ + priv->channel[CTCM_READ]->pdu_seq = 0x00; + skb_reset_mac_header(skb); + skb->dev = dev; + skb->protocol = htons(ETH_P_SNAP); + skb->ip_summed = CHECKSUM_UNNECESSARY; + + CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); + + netif_rx(skb); + break; + default: + break; + + } + + return 0; +} +/* --- This is the END my friend --- */ + diff --git a/drivers/s390/net/ctcm_mpc.h b/drivers/s390/net/ctcm_mpc.h new file mode 100644 index 000000000..441d7b211 --- /dev/null +++ b/drivers/s390/net/ctcm_mpc.h @@ -0,0 +1,239 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2007 + * Authors: Peter Tiedemann (ptiedem@de.ibm.com) + * + * MPC additions: + * Belinda Thompson (belindat@us.ibm.com) + * Andy Richter (richtera@us.ibm.com) + */ + +#ifndef _CTC_MPC_H_ +#define _CTC_MPC_H_ + +#include +#include +#include "fsm.h" + +/* + * MPC external interface + * Note that ctc_mpc_xyz are called with a lock on ................ + */ + +/* port_number is the mpc device 0, 1, 2 etc mpc2 is port_number 2 */ + +/* passive open Just wait for XID2 exchange */ +extern int ctc_mpc_alloc_channel(int port, + void (*callback)(int port_num, int max_write_size)); +/* active open Alloc then send XID2 */ +extern void ctc_mpc_establish_connectivity(int port, + void (*callback)(int port_num, int rc, int max_write_size)); + +extern void ctc_mpc_dealloc_ch(int port); +extern void ctc_mpc_flow_control(int port, int flowc); + +/* + * other MPC Group prototypes and structures + */ + +#define ETH_P_SNA_DIX 0x80D5 + +/* + * Declaration of an XID2 + * + */ +#define ALLZEROS 0x0000000000000000 + +#define XID_FM2 0x20 +#define XID2_0 0x00 +#define XID2_7 0x07 +#define XID2_WRITE_SIDE 0x04 +#define XID2_READ_SIDE 0x05 + +struct xid2 { + __u8 xid2_type_id; + __u8 xid2_len; + __u32 xid2_adj_id; + __u8 xid2_rlen; + __u8 xid2_resv1; + __u8 xid2_flag1; + __u8 xid2_fmtt; + __u8 xid2_flag4; + __u16 xid2_resv2; + __u8 xid2_tgnum; + __u32 xid2_sender_id; + __u8 xid2_flag2; + __u8 xid2_option; + char xid2_resv3[8]; + __u16 xid2_resv4; + __u8 xid2_dlc_type; + __u16 xid2_resv5; + __u8 xid2_mpc_flag; + __u8 xid2_resv6; + __u16 xid2_buf_len; + char xid2_buffer[255 - (13 * sizeof(__u8) + + 2 * sizeof(__u32) + + 4 * sizeof(__u16) + + 8 * sizeof(char))]; +} __attribute__ ((packed)); + +#define XID2_LENGTH (sizeof(struct xid2)) + +struct th_header { + __u8 th_seg; + __u8 th_ch_flag; +#define TH_HAS_PDU 0xf0 +#define TH_IS_XID 0x01 +#define TH_SWEEP_REQ 0xfe +#define TH_SWEEP_RESP 0xff + __u8 th_blk_flag; +#define TH_DATA_IS_XID 0x80 +#define TH_RETRY 0x40 +#define TH_DISCONTACT 0xc0 +#define TH_SEG_BLK 0x20 +#define TH_LAST_SEG 0x10 +#define TH_PDU_PART 0x08 + __u8 th_is_xid; /* is 0x01 if this is XID */ + __u32 th_seq_num; +} __attribute__ ((packed)); + +struct th_addon { + __u32 th_last_seq; + __u32 th_resvd; +} __attribute__ ((packed)); + +struct th_sweep { + struct th_header th; + struct th_addon sw; +} __attribute__ ((packed)); + +#define TH_HEADER_LENGTH (sizeof(struct th_header)) +#define TH_SWEEP_LENGTH (sizeof(struct th_sweep)) + +#define PDU_LAST 0x80 +#define PDU_CNTL 0x40 +#define PDU_FIRST 0x20 + +struct pdu { + __u32 pdu_offset; + __u8 pdu_flag; + __u8 pdu_proto; /* 0x01 is APPN SNA */ + __u16 pdu_seq; +} __attribute__ ((packed)); + +#define PDU_HEADER_LENGTH (sizeof(struct pdu)) + +struct qllc { + __u8 qllc_address; +#define QLLC_REQ 0xFF +#define QLLC_RESP 0x00 + __u8 qllc_commands; +#define QLLC_DISCONNECT 0x53 +#define QLLC_UNSEQACK 0x73 +#define QLLC_SETMODE 0x93 +#define QLLC_EXCHID 0xBF +} __attribute__ ((packed)); + + +/* + * Definition of one MPC group + */ + +#define MAX_MPCGCHAN 10 +#define MPC_XID_TIMEOUT_VALUE 10000 +#define MPC_CHANNEL_ADD 0 +#define MPC_CHANNEL_REMOVE 1 +#define MPC_CHANNEL_ATTN 2 +#define XSIDE 1 +#define YSIDE 0 + +struct mpcg_info { + struct sk_buff *skb; + struct channel *ch; + struct xid2 *xid; + struct th_sweep *sweep; + struct th_header *th; +}; + +struct mpc_group { + struct tasklet_struct mpc_tasklet; + struct tasklet_struct mpc_tasklet2; + int changed_side; + int saved_state; + int channels_terminating; + int out_of_sequence; + int flow_off_called; + int port_num; + int port_persist; + int alloc_called; + __u32 xid2_adj_id; + __u8 xid2_tgnum; + __u32 xid2_sender_id; + int num_channel_paths; + int active_channels[2]; + __u16 group_max_buflen; + int outstanding_xid2; + int outstanding_xid7; + int outstanding_xid7_p2; + int sweep_req_pend_num; + int sweep_rsp_pend_num; + struct sk_buff *xid_skb; + char *xid_skb_data; + struct th_header *xid_th; + struct xid2 *xid; + char *xid_id; + struct th_header *rcvd_xid_th; + struct sk_buff *rcvd_xid_skb; + char *rcvd_xid_data; + __u8 in_sweep; + __u8 roll; + struct xid2 *saved_xid2; + void (*allochanfunc)(int, int); + int allocchan_callback_retries; + void (*estconnfunc)(int, int, int); + int estconn_callback_retries; + int estconn_called; + int xidnogood; + int send_qllc_disc; + fsm_timer timer; + fsm_instance *fsm; /* group xid fsm */ +}; + +#ifdef DEBUGDATA +void ctcmpc_dumpit(char *buf, int len); +#else +static inline void ctcmpc_dumpit(char *buf, int len) +{ +} +#endif + +#ifdef DEBUGDATA +/* + * Dump header and first 16 bytes of an sk_buff for debugging purposes. + * + * skb The struct sk_buff to dump. + * offset Offset relative to skb-data, where to start the dump. + */ +void ctcmpc_dump_skb(struct sk_buff *skb, int offset); +#else +static inline void ctcmpc_dump_skb(struct sk_buff *skb, int offset) +{} +#endif + +static inline void ctcmpc_dump32(char *buf, int len) +{ + if (len < 32) + ctcmpc_dumpit(buf, len); + else + ctcmpc_dumpit(buf, 32); +} + +int ctcmpc_open(struct net_device *); +void ctcm_ccw_check_rc(struct channel *, int, char *); +void mpc_group_ready(unsigned long adev); +void mpc_channel_action(struct channel *ch, int direction, int action); +void mpc_action_send_discontact(unsigned long thischan); +void mpc_action_discontact(fsm_instance *fi, int event, void *arg); +void ctcmpc_bh(unsigned long thischan); +#endif +/* --- This is the END my friend --- */ diff --git a/drivers/s390/net/ctcm_sysfs.c b/drivers/s390/net/ctcm_sysfs.c new file mode 100644 index 000000000..e3813a7aa --- /dev/null +++ b/drivers/s390/net/ctcm_sysfs.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2007, 2007 + * Authors: Peter Tiedemann (ptiedem@de.ibm.com) + * + */ + +#undef DEBUG +#undef DEBUGDATA +#undef DEBUGCCW + +#define KMSG_COMPONENT "ctcm" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include "ctcm_main.h" + +/* + * sysfs attributes + */ + +static ssize_t ctcm_buffer_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ctcm_priv *priv = dev_get_drvdata(dev); + + if (!priv) + return -ENODEV; + return sprintf(buf, "%d\n", priv->buffer_size); +} + +static ssize_t ctcm_buffer_write(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct net_device *ndev; + unsigned int bs1; + struct ctcm_priv *priv = dev_get_drvdata(dev); + int rc; + + if (!(priv && priv->channel[CTCM_READ] && + priv->channel[CTCM_READ]->netdev)) { + CTCM_DBF_TEXT(SETUP, CTC_DBF_ERROR, "bfnondev"); + return -ENODEV; + } + ndev = priv->channel[CTCM_READ]->netdev; + + rc = kstrtouint(buf, 0, &bs1); + if (rc) + goto einval; + if (bs1 > CTCM_BUFSIZE_LIMIT) + goto einval; + if (bs1 < (576 + LL_HEADER_LENGTH + 2)) + goto einval; + priv->buffer_size = bs1; /* just to overwrite the default */ + + if ((ndev->flags & IFF_RUNNING) && + (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2))) + goto einval; + + priv->channel[CTCM_READ]->max_bufsize = bs1; + priv->channel[CTCM_WRITE]->max_bufsize = bs1; + if (!(ndev->flags & IFF_RUNNING)) + ndev->mtu = bs1 - LL_HEADER_LENGTH - 2; + priv->channel[CTCM_READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED; + priv->channel[CTCM_WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED; + + CTCM_DBF_DEV(SETUP, ndev, buf); + return count; + +einval: + CTCM_DBF_DEV(SETUP, ndev, "buff_err"); + return -EINVAL; +} + +static void ctcm_print_statistics(struct ctcm_priv *priv) +{ + char *sbuf; + char *p; + + if (!priv) + return; + sbuf = kmalloc(2048, GFP_KERNEL); + if (sbuf == NULL) + return; + p = sbuf; + + p += sprintf(p, " Device FSM state: %s\n", + fsm_getstate_str(priv->fsm)); + p += sprintf(p, " RX channel FSM state: %s\n", + fsm_getstate_str(priv->channel[CTCM_READ]->fsm)); + p += sprintf(p, " TX channel FSM state: %s\n", + fsm_getstate_str(priv->channel[CTCM_WRITE]->fsm)); + p += sprintf(p, " Max. TX buffer used: %ld\n", + priv->channel[WRITE]->prof.maxmulti); + p += sprintf(p, " Max. chained SKBs: %ld\n", + priv->channel[WRITE]->prof.maxcqueue); + p += sprintf(p, " TX single write ops: %ld\n", + priv->channel[WRITE]->prof.doios_single); + p += sprintf(p, " TX multi write ops: %ld\n", + priv->channel[WRITE]->prof.doios_multi); + p += sprintf(p, " Netto bytes written: %ld\n", + priv->channel[WRITE]->prof.txlen); + p += sprintf(p, " Max. TX IO-time: %u\n", + jiffies_to_usecs(priv->channel[WRITE]->prof.tx_time)); + + printk(KERN_INFO "Statistics for %s:\n%s", + priv->channel[CTCM_WRITE]->netdev->name, sbuf); + kfree(sbuf); + return; +} + +static ssize_t stats_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ccwgroup_device *gdev = to_ccwgroupdev(dev); + struct ctcm_priv *priv = dev_get_drvdata(dev); + + if (!priv || gdev->state != CCWGROUP_ONLINE) + return -ENODEV; + ctcm_print_statistics(priv); + return sprintf(buf, "0\n"); +} + +static ssize_t stats_write(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ctcm_priv *priv = dev_get_drvdata(dev); + if (!priv) + return -ENODEV; + /* Reset statistics */ + memset(&priv->channel[WRITE]->prof, 0, + sizeof(priv->channel[CTCM_WRITE]->prof)); + return count; +} + +static ssize_t ctcm_proto_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ctcm_priv *priv = dev_get_drvdata(dev); + if (!priv) + return -ENODEV; + + return sprintf(buf, "%d\n", priv->protocol); +} + +static ssize_t ctcm_proto_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int value, rc; + struct ctcm_priv *priv = dev_get_drvdata(dev); + + if (!priv) + return -ENODEV; + rc = kstrtoint(buf, 0, &value); + if (rc || + !((value == CTCM_PROTO_S390) || + (value == CTCM_PROTO_LINUX) || + (value == CTCM_PROTO_MPC) || + (value == CTCM_PROTO_OS390))) + return -EINVAL; + priv->protocol = value; + CTCM_DBF_DEV(SETUP, dev, buf); + + return count; +} + +static const char *ctcm_type[] = { + "not a channel", + "CTC/A", + "FICON channel", + "ESCON channel", + "unknown channel type", + "unsupported channel type", +}; + +static ssize_t ctcm_type_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ccwgroup_device *cgdev; + + cgdev = to_ccwgroupdev(dev); + if (!cgdev) + return -ENODEV; + + return sprintf(buf, "%s\n", + ctcm_type[cgdev->cdev[0]->id.driver_info]); +} + +static DEVICE_ATTR(buffer, 0644, ctcm_buffer_show, ctcm_buffer_write); +static DEVICE_ATTR(protocol, 0644, ctcm_proto_show, ctcm_proto_store); +static DEVICE_ATTR(type, 0444, ctcm_type_show, NULL); +static DEVICE_ATTR(stats, 0644, stats_show, stats_write); + +static struct attribute *ctcm_attr[] = { + &dev_attr_protocol.attr, + &dev_attr_type.attr, + &dev_attr_buffer.attr, + &dev_attr_stats.attr, + NULL, +}; + +static struct attribute_group ctcm_attr_group = { + .attrs = ctcm_attr, +}; +const struct attribute_group *ctcm_attr_groups[] = { + &ctcm_attr_group, + NULL, +}; diff --git a/drivers/s390/net/fsm.c b/drivers/s390/net/fsm.c new file mode 100644 index 000000000..eb07862bd --- /dev/null +++ b/drivers/s390/net/fsm.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0 +/** + * A generic FSM based on fsm used in isdn4linux + * + */ + +#include "fsm.h" +#include +#include +#include + +MODULE_AUTHOR("(C) 2000 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); +MODULE_DESCRIPTION("Finite state machine helper functions"); +MODULE_LICENSE("GPL"); + +fsm_instance * +init_fsm(char *name, const char **state_names, const char **event_names, int nr_states, + int nr_events, const fsm_node *tmpl, int tmpl_len, gfp_t order) +{ + int i; + fsm_instance *this; + fsm_function_t *m; + fsm *f; + + this = kzalloc(sizeof(fsm_instance), order); + if (this == NULL) { + printk(KERN_WARNING + "fsm(%s): init_fsm: Couldn't alloc instance\n", name); + return NULL; + } + strlcpy(this->name, name, sizeof(this->name)); + init_waitqueue_head(&this->wait_q); + + f = kzalloc(sizeof(fsm), order); + if (f == NULL) { + printk(KERN_WARNING + "fsm(%s): init_fsm: Couldn't alloc fsm\n", name); + kfree_fsm(this); + return NULL; + } + f->nr_events = nr_events; + f->nr_states = nr_states; + f->event_names = event_names; + f->state_names = state_names; + this->f = f; + + m = kcalloc(nr_states*nr_events, sizeof(fsm_function_t), order); + if (m == NULL) { + printk(KERN_WARNING + "fsm(%s): init_fsm: Couldn't alloc jumptable\n", name); + kfree_fsm(this); + return NULL; + } + f->jumpmatrix = m; + + for (i = 0; i < tmpl_len; i++) { + if ((tmpl[i].cond_state >= nr_states) || + (tmpl[i].cond_event >= nr_events) ) { + printk(KERN_ERR + "fsm(%s): init_fsm: Bad template l=%d st(%ld/%ld) ev(%ld/%ld)\n", + name, i, (long)tmpl[i].cond_state, (long)f->nr_states, + (long)tmpl[i].cond_event, (long)f->nr_events); + kfree_fsm(this); + return NULL; + } else + m[nr_states * tmpl[i].cond_event + tmpl[i].cond_state] = + tmpl[i].function; + } + return this; +} + +void +kfree_fsm(fsm_instance *this) +{ + if (this) { + if (this->f) { + kfree(this->f->jumpmatrix); + kfree(this->f); + } + kfree(this); + } else + printk(KERN_WARNING + "fsm: kfree_fsm called with NULL argument\n"); +} + +#if FSM_DEBUG_HISTORY +void +fsm_print_history(fsm_instance *fi) +{ + int idx = 0; + int i; + + if (fi->history_size >= FSM_HISTORY_SIZE) + idx = fi->history_index; + + printk(KERN_DEBUG "fsm(%s): History:\n", fi->name); + for (i = 0; i < fi->history_size; i++) { + int e = fi->history[idx].event; + int s = fi->history[idx++].state; + idx %= FSM_HISTORY_SIZE; + if (e == -1) + printk(KERN_DEBUG " S=%s\n", + fi->f->state_names[s]); + else + printk(KERN_DEBUG " S=%s E=%s\n", + fi->f->state_names[s], + fi->f->event_names[e]); + } + fi->history_size = fi->history_index = 0; +} + +void +fsm_record_history(fsm_instance *fi, int state, int event) +{ + fi->history[fi->history_index].state = state; + fi->history[fi->history_index++].event = event; + fi->history_index %= FSM_HISTORY_SIZE; + if (fi->history_size < FSM_HISTORY_SIZE) + fi->history_size++; +} +#endif + +const char * +fsm_getstate_str(fsm_instance *fi) +{ + int st = atomic_read(&fi->state); + if (st >= fi->f->nr_states) + return "Invalid"; + return fi->f->state_names[st]; +} + +static void +fsm_expire_timer(struct timer_list *t) +{ + fsm_timer *this = from_timer(this, t, tl); +#if FSM_TIMER_DEBUG + printk(KERN_DEBUG "fsm(%s): Timer %p expired\n", + this->fi->name, this); +#endif + fsm_event(this->fi, this->expire_event, this->event_arg); +} + +void +fsm_settimer(fsm_instance *fi, fsm_timer *this) +{ + this->fi = fi; +#if FSM_TIMER_DEBUG + printk(KERN_DEBUG "fsm(%s): Create timer %p\n", fi->name, + this); +#endif + timer_setup(&this->tl, fsm_expire_timer, 0); +} + +void +fsm_deltimer(fsm_timer *this) +{ +#if FSM_TIMER_DEBUG + printk(KERN_DEBUG "fsm(%s): Delete timer %p\n", this->fi->name, + this); +#endif + del_timer(&this->tl); +} + +int +fsm_addtimer(fsm_timer *this, int millisec, int event, void *arg) +{ + +#if FSM_TIMER_DEBUG + printk(KERN_DEBUG "fsm(%s): Add timer %p %dms\n", + this->fi->name, this, millisec); +#endif + + timer_setup(&this->tl, fsm_expire_timer, 0); + this->expire_event = event; + this->event_arg = arg; + this->tl.expires = jiffies + (millisec * HZ) / 1000; + add_timer(&this->tl); + return 0; +} + +/* FIXME: this function is never used, why */ +void +fsm_modtimer(fsm_timer *this, int millisec, int event, void *arg) +{ + +#if FSM_TIMER_DEBUG + printk(KERN_DEBUG "fsm(%s): Restart timer %p %dms\n", + this->fi->name, this, millisec); +#endif + + del_timer(&this->tl); + timer_setup(&this->tl, fsm_expire_timer, 0); + this->expire_event = event; + this->event_arg = arg; + this->tl.expires = jiffies + (millisec * HZ) / 1000; + add_timer(&this->tl); +} + +EXPORT_SYMBOL(init_fsm); +EXPORT_SYMBOL(kfree_fsm); +EXPORT_SYMBOL(fsm_settimer); +EXPORT_SYMBOL(fsm_deltimer); +EXPORT_SYMBOL(fsm_addtimer); +EXPORT_SYMBOL(fsm_modtimer); +EXPORT_SYMBOL(fsm_getstate_str); + +#if FSM_DEBUG_HISTORY +EXPORT_SYMBOL(fsm_print_history); +EXPORT_SYMBOL(fsm_record_history); +#endif diff --git a/drivers/s390/net/fsm.h b/drivers/s390/net/fsm.h new file mode 100644 index 000000000..16dc071a2 --- /dev/null +++ b/drivers/s390/net/fsm.h @@ -0,0 +1,266 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _FSM_H_ +#define _FSM_H_ + +#include +#include +#include +#include +#include +#include +#include +#include + +/** + * Define this to get debugging messages. + */ +#define FSM_DEBUG 0 + +/** + * Define this to get debugging massages for + * timer handling. + */ +#define FSM_TIMER_DEBUG 0 + +/** + * Define these to record a history of + * Events/Statechanges and print it if a + * action_function is not found. + */ +#define FSM_DEBUG_HISTORY 0 +#define FSM_HISTORY_SIZE 40 + +struct fsm_instance_t; + +/** + * Definition of an action function, called by a FSM + */ +typedef void (*fsm_function_t)(struct fsm_instance_t *, int, void *); + +/** + * Internal jump table for a FSM + */ +typedef struct { + fsm_function_t *jumpmatrix; + int nr_events; + int nr_states; + const char **event_names; + const char **state_names; +} fsm; + +#if FSM_DEBUG_HISTORY +/** + * Element of State/Event history used for debugging. + */ +typedef struct { + int state; + int event; +} fsm_history; +#endif + +/** + * Representation of a FSM + */ +typedef struct fsm_instance_t { + fsm *f; + atomic_t state; + char name[16]; + void *userdata; + int userint; + wait_queue_head_t wait_q; +#if FSM_DEBUG_HISTORY + int history_index; + int history_size; + fsm_history history[FSM_HISTORY_SIZE]; +#endif +} fsm_instance; + +/** + * Description of a state-event combination + */ +typedef struct { + int cond_state; + int cond_event; + fsm_function_t function; +} fsm_node; + +/** + * Description of a FSM Timer. + */ +typedef struct { + fsm_instance *fi; + struct timer_list tl; + int expire_event; + void *event_arg; +} fsm_timer; + +/** + * Creates an FSM + * + * @param name Name of this instance for logging purposes. + * @param state_names An array of names for all states for logging purposes. + * @param event_names An array of names for all events for logging purposes. + * @param nr_states Number of states for this instance. + * @param nr_events Number of events for this instance. + * @param tmpl An array of fsm_nodes, describing this FSM. + * @param tmpl_len Length of the describing array. + * @param order Parameter for allocation of the FSM data structs. + */ +extern fsm_instance * +init_fsm(char *name, const char **state_names, + const char **event_names, + int nr_states, int nr_events, const fsm_node *tmpl, + int tmpl_len, gfp_t order); + +/** + * Releases an FSM + * + * @param fi Pointer to an FSM, previously created with init_fsm. + */ +extern void kfree_fsm(fsm_instance *fi); + +#if FSM_DEBUG_HISTORY +extern void +fsm_print_history(fsm_instance *fi); + +extern void +fsm_record_history(fsm_instance *fi, int state, int event); +#endif + +/** + * Emits an event to a FSM. + * If an action function is defined for the current state/event combination, + * this function is called. + * + * @param fi Pointer to FSM which should receive the event. + * @param event The event do be delivered. + * @param arg A generic argument, handed to the action function. + * + * @return 0 on success, + * 1 if current state or event is out of range + * !0 if state and event in range, but no action defined. + */ +static inline int +fsm_event(fsm_instance *fi, int event, void *arg) +{ + fsm_function_t r; + int state = atomic_read(&fi->state); + + if ((state >= fi->f->nr_states) || + (event >= fi->f->nr_events) ) { + printk(KERN_ERR "fsm(%s): Invalid state st(%ld/%ld) ev(%d/%ld)\n", + fi->name, (long)state,(long)fi->f->nr_states, event, + (long)fi->f->nr_events); +#if FSM_DEBUG_HISTORY + fsm_print_history(fi); +#endif + return 1; + } + r = fi->f->jumpmatrix[fi->f->nr_states * event + state]; + if (r) { +#if FSM_DEBUG + printk(KERN_DEBUG "fsm(%s): state %s event %s\n", + fi->name, fi->f->state_names[state], + fi->f->event_names[event]); +#endif +#if FSM_DEBUG_HISTORY + fsm_record_history(fi, state, event); +#endif + r(fi, event, arg); + return 0; + } else { +#if FSM_DEBUG || FSM_DEBUG_HISTORY + printk(KERN_DEBUG "fsm(%s): no function for event %s in state %s\n", + fi->name, fi->f->event_names[event], + fi->f->state_names[state]); +#endif +#if FSM_DEBUG_HISTORY + fsm_print_history(fi); +#endif + return !0; + } +} + +/** + * Modifies the state of an FSM. + * This does not trigger an event or calls an action function. + * + * @param fi Pointer to FSM + * @param state The new state for this FSM. + */ +static inline void +fsm_newstate(fsm_instance *fi, int newstate) +{ + atomic_set(&fi->state,newstate); +#if FSM_DEBUG_HISTORY + fsm_record_history(fi, newstate, -1); +#endif +#if FSM_DEBUG + printk(KERN_DEBUG "fsm(%s): New state %s\n", fi->name, + fi->f->state_names[newstate]); +#endif + wake_up(&fi->wait_q); +} + +/** + * Retrieves the state of an FSM + * + * @param fi Pointer to FSM + * + * @return The current state of the FSM. + */ +static inline int +fsm_getstate(fsm_instance *fi) +{ + return atomic_read(&fi->state); +} + +/** + * Retrieves the name of the state of an FSM + * + * @param fi Pointer to FSM + * + * @return The current state of the FSM in a human readable form. + */ +extern const char *fsm_getstate_str(fsm_instance *fi); + +/** + * Initializes a timer for an FSM. + * This prepares an fsm_timer for usage with fsm_addtimer. + * + * @param fi Pointer to FSM + * @param timer The timer to be initialized. + */ +extern void fsm_settimer(fsm_instance *fi, fsm_timer *); + +/** + * Clears a pending timer of an FSM instance. + * + * @param timer The timer to clear. + */ +extern void fsm_deltimer(fsm_timer *timer); + +/** + * Adds and starts a timer to an FSM instance. + * + * @param timer The timer to be added. The field fi of that timer + * must have been set to point to the instance. + * @param millisec Duration, after which the timer should expire. + * @param event Event, to trigger if timer expires. + * @param arg Generic argument, provided to expiry function. + * + * @return 0 on success, -1 if timer is already active. + */ +extern int fsm_addtimer(fsm_timer *timer, int millisec, int event, void *arg); + +/** + * Modifies a timer of an FSM. + * + * @param timer The timer to modify. + * @param millisec Duration, after which the timer should expire. + * @param event Event, to trigger if timer expires. + * @param arg Generic argument, provided to expiry function. + */ +extern void fsm_modtimer(fsm_timer *timer, int millisec, int event, void *arg); + +#endif /* _FSM_H_ */ diff --git a/drivers/s390/net/ism.h b/drivers/s390/net/ism.h new file mode 100644 index 000000000..0aab90817 --- /dev/null +++ b/drivers/s390/net/ism.h @@ -0,0 +1,221 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef S390_ISM_H +#define S390_ISM_H + +#include +#include +#include +#include + +#define UTIL_STR_LEN 16 + +/* + * Do not use the first word of the DMB bits to ensure 8 byte aligned access. + */ +#define ISM_DMB_WORD_OFFSET 1 +#define ISM_DMB_BIT_OFFSET (ISM_DMB_WORD_OFFSET * 32) +#define ISM_NR_DMBS 1920 + +#define ISM_REG_SBA 0x1 +#define ISM_REG_IEQ 0x2 +#define ISM_READ_GID 0x3 +#define ISM_ADD_VLAN_ID 0x4 +#define ISM_DEL_VLAN_ID 0x5 +#define ISM_SET_VLAN 0x6 +#define ISM_RESET_VLAN 0x7 +#define ISM_QUERY_INFO 0x8 +#define ISM_QUERY_RGID 0x9 +#define ISM_REG_DMB 0xA +#define ISM_UNREG_DMB 0xB +#define ISM_SIGNAL_IEQ 0xE +#define ISM_UNREG_SBA 0x11 +#define ISM_UNREG_IEQ 0x12 + +#define ISM_ERROR 0xFFFF + +struct ism_req_hdr { + u32 cmd; + u16 : 16; + u16 len; +}; + +struct ism_resp_hdr { + u32 cmd; + u16 ret; + u16 len; +}; + +union ism_reg_sba { + struct { + struct ism_req_hdr hdr; + u64 sba; + } request; + struct { + struct ism_resp_hdr hdr; + } response; +} __aligned(16); + +union ism_reg_ieq { + struct { + struct ism_req_hdr hdr; + u64 ieq; + u64 len; + } request; + struct { + struct ism_resp_hdr hdr; + } response; +} __aligned(16); + +union ism_read_gid { + struct { + struct ism_req_hdr hdr; + } request; + struct { + struct ism_resp_hdr hdr; + u64 gid; + } response; +} __aligned(16); + +union ism_qi { + struct { + struct ism_req_hdr hdr; + } request; + struct { + struct ism_resp_hdr hdr; + u32 version; + u32 max_len; + u64 ism_state; + u64 my_gid; + u64 sba; + u64 ieq; + u32 ieq_len; + u32 : 32; + u32 dmbs_owned; + u32 dmbs_used; + u32 vlan_required; + u32 vlan_nr_ids; + u16 vlan_id[64]; + } response; +} __aligned(64); + +union ism_query_rgid { + struct { + struct ism_req_hdr hdr; + u64 rgid; + u32 vlan_valid; + u32 vlan_id; + } request; + struct { + struct ism_resp_hdr hdr; + } response; +} __aligned(16); + +union ism_reg_dmb { + struct { + struct ism_req_hdr hdr; + u64 dmb; + u32 dmb_len; + u32 sba_idx; + u32 vlan_valid; + u32 vlan_id; + u64 rgid; + } request; + struct { + struct ism_resp_hdr hdr; + u64 dmb_tok; + } response; +} __aligned(32); + +union ism_sig_ieq { + struct { + struct ism_req_hdr hdr; + u64 rgid; + u32 trigger_irq; + u32 event_code; + u64 info; + } request; + struct { + struct ism_resp_hdr hdr; + } response; +} __aligned(32); + +union ism_unreg_dmb { + struct { + struct ism_req_hdr hdr; + u64 dmb_tok; + } request; + struct { + struct ism_resp_hdr hdr; + } response; +} __aligned(16); + +union ism_cmd_simple { + struct { + struct ism_req_hdr hdr; + } request; + struct { + struct ism_resp_hdr hdr; + } response; +} __aligned(8); + +union ism_set_vlan_id { + struct { + struct ism_req_hdr hdr; + u64 vlan_id; + } request; + struct { + struct ism_resp_hdr hdr; + } response; +} __aligned(16); + +struct ism_eq_header { + u64 idx; + u64 ieq_len; + u64 entry_len; + u64 : 64; +}; + +struct ism_eq { + struct ism_eq_header header; + struct smcd_event entry[15]; +}; + +struct ism_sba { + u32 s : 1; /* summary bit */ + u32 e : 1; /* event bit */ + u32 : 30; + u32 dmb_bits[ISM_NR_DMBS / 32]; + u32 reserved[3]; + u16 dmbe_mask[ISM_NR_DMBS]; +}; + +struct ism_dev { + spinlock_t lock; + struct pci_dev *pdev; + struct smcd_dev *smcd; + + void __iomem *ctl; + + struct ism_sba *sba; + dma_addr_t sba_dma_addr; + DECLARE_BITMAP(sba_bitmap, ISM_NR_DMBS); + + struct ism_eq *ieq; + dma_addr_t ieq_dma_addr; + + int ieq_idx; +}; + +#define ISM_CREATE_REQ(dmb, idx, sf, offset) \ + ((dmb) | (idx) << 24 | (sf) << 23 | (offset)) + +static inline int __ism_move(struct ism_dev *ism, u64 dmb_req, void *data, + unsigned int size) +{ + struct zpci_dev *zdev = to_zpci(ism->pdev); + u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, size); + + return zpci_write_block(req, data, dmb_req); +} + +#endif /* S390_ISM_H */ diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c new file mode 100644 index 000000000..00cc96341 --- /dev/null +++ b/drivers/s390/net/ism_drv.c @@ -0,0 +1,629 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ISM driver for s390. + * + * Copyright IBM Corp. 2018 + */ +#define KMSG_COMPONENT "ism" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "ism.h" + +MODULE_DESCRIPTION("ISM driver for s390"); +MODULE_LICENSE("GPL"); + +#define PCI_DEVICE_ID_IBM_ISM 0x04ED +#define DRV_NAME "ism" + +static const struct pci_device_id ism_device_table[] = { + { PCI_VDEVICE(IBM, PCI_DEVICE_ID_IBM_ISM), 0 }, + { 0, } +}; +MODULE_DEVICE_TABLE(pci, ism_device_table); + +static debug_info_t *ism_debug_info; + +static int ism_cmd(struct ism_dev *ism, void *cmd) +{ + struct ism_req_hdr *req = cmd; + struct ism_resp_hdr *resp = cmd; + + memcpy_toio(ism->ctl + sizeof(*req), req + 1, req->len - sizeof(*req)); + memcpy_toio(ism->ctl, req, sizeof(*req)); + + WRITE_ONCE(resp->ret, ISM_ERROR); + + memcpy_fromio(resp, ism->ctl, sizeof(*resp)); + if (resp->ret) { + debug_text_event(ism_debug_info, 0, "cmd failure"); + debug_event(ism_debug_info, 0, resp, sizeof(*resp)); + goto out; + } + memcpy_fromio(resp + 1, ism->ctl + sizeof(*resp), + resp->len - sizeof(*resp)); +out: + return resp->ret; +} + +static int ism_cmd_simple(struct ism_dev *ism, u32 cmd_code) +{ + union ism_cmd_simple cmd; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = cmd_code; + cmd.request.hdr.len = sizeof(cmd.request); + + return ism_cmd(ism, &cmd); +} + +static int query_info(struct ism_dev *ism) +{ + union ism_qi cmd; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = ISM_QUERY_INFO; + cmd.request.hdr.len = sizeof(cmd.request); + + if (ism_cmd(ism, &cmd)) + goto out; + + debug_text_event(ism_debug_info, 3, "query info"); + debug_event(ism_debug_info, 3, &cmd.response, sizeof(cmd.response)); +out: + return 0; +} + +static int register_sba(struct ism_dev *ism) +{ + union ism_reg_sba cmd; + dma_addr_t dma_handle; + struct ism_sba *sba; + + sba = dma_zalloc_coherent(&ism->pdev->dev, PAGE_SIZE, + &dma_handle, GFP_KERNEL); + if (!sba) + return -ENOMEM; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = ISM_REG_SBA; + cmd.request.hdr.len = sizeof(cmd.request); + cmd.request.sba = dma_handle; + + if (ism_cmd(ism, &cmd)) { + dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, sba, dma_handle); + return -EIO; + } + + ism->sba = sba; + ism->sba_dma_addr = dma_handle; + + return 0; +} + +static int register_ieq(struct ism_dev *ism) +{ + union ism_reg_ieq cmd; + dma_addr_t dma_handle; + struct ism_eq *ieq; + + ieq = dma_zalloc_coherent(&ism->pdev->dev, PAGE_SIZE, + &dma_handle, GFP_KERNEL); + if (!ieq) + return -ENOMEM; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = ISM_REG_IEQ; + cmd.request.hdr.len = sizeof(cmd.request); + cmd.request.ieq = dma_handle; + cmd.request.len = sizeof(*ieq); + + if (ism_cmd(ism, &cmd)) { + dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, ieq, dma_handle); + return -EIO; + } + + ism->ieq = ieq; + ism->ieq_idx = -1; + ism->ieq_dma_addr = dma_handle; + + return 0; +} + +static int unregister_sba(struct ism_dev *ism) +{ + int ret; + + if (!ism->sba) + return 0; + + ret = ism_cmd_simple(ism, ISM_UNREG_SBA); + if (ret && ret != ISM_ERROR) + return -EIO; + + dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, + ism->sba, ism->sba_dma_addr); + + ism->sba = NULL; + ism->sba_dma_addr = 0; + + return 0; +} + +static int unregister_ieq(struct ism_dev *ism) +{ + int ret; + + if (!ism->ieq) + return 0; + + ret = ism_cmd_simple(ism, ISM_UNREG_IEQ); + if (ret && ret != ISM_ERROR) + return -EIO; + + dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, + ism->ieq, ism->ieq_dma_addr); + + ism->ieq = NULL; + ism->ieq_dma_addr = 0; + + return 0; +} + +static int ism_read_local_gid(struct ism_dev *ism) +{ + union ism_read_gid cmd; + int ret; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = ISM_READ_GID; + cmd.request.hdr.len = sizeof(cmd.request); + + ret = ism_cmd(ism, &cmd); + if (ret) + goto out; + + ism->smcd->local_gid = cmd.response.gid; +out: + return ret; +} + +static int ism_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid, + u32 vid) +{ + struct ism_dev *ism = smcd->priv; + union ism_query_rgid cmd; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = ISM_QUERY_RGID; + cmd.request.hdr.len = sizeof(cmd.request); + + cmd.request.rgid = rgid; + cmd.request.vlan_valid = vid_valid; + cmd.request.vlan_id = vid; + + return ism_cmd(ism, &cmd); +} + +static void ism_free_dmb(struct ism_dev *ism, struct smcd_dmb *dmb) +{ + clear_bit(dmb->sba_idx, ism->sba_bitmap); + dma_free_coherent(&ism->pdev->dev, dmb->dmb_len, + dmb->cpu_addr, dmb->dma_addr); +} + +static int ism_alloc_dmb(struct ism_dev *ism, struct smcd_dmb *dmb) +{ + unsigned long bit; + + if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(&ism->pdev->dev)) + return -EINVAL; + + if (!dmb->sba_idx) { + bit = find_next_zero_bit(ism->sba_bitmap, ISM_NR_DMBS, + ISM_DMB_BIT_OFFSET); + if (bit == ISM_NR_DMBS) + return -ENOMEM; + + dmb->sba_idx = bit; + } + if (dmb->sba_idx < ISM_DMB_BIT_OFFSET || + test_and_set_bit(dmb->sba_idx, ism->sba_bitmap)) + return -EINVAL; + + dmb->cpu_addr = dma_zalloc_coherent(&ism->pdev->dev, dmb->dmb_len, + &dmb->dma_addr, GFP_KERNEL | + __GFP_NOWARN | __GFP_NOMEMALLOC | + __GFP_COMP | __GFP_NORETRY); + if (!dmb->cpu_addr) + clear_bit(dmb->sba_idx, ism->sba_bitmap); + + return dmb->cpu_addr ? 0 : -ENOMEM; +} + +static int ism_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb) +{ + struct ism_dev *ism = smcd->priv; + union ism_reg_dmb cmd; + int ret; + + ret = ism_alloc_dmb(ism, dmb); + if (ret) + goto out; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = ISM_REG_DMB; + cmd.request.hdr.len = sizeof(cmd.request); + + cmd.request.dmb = dmb->dma_addr; + cmd.request.dmb_len = dmb->dmb_len; + cmd.request.sba_idx = dmb->sba_idx; + cmd.request.vlan_valid = dmb->vlan_valid; + cmd.request.vlan_id = dmb->vlan_id; + cmd.request.rgid = dmb->rgid; + + ret = ism_cmd(ism, &cmd); + if (ret) { + ism_free_dmb(ism, dmb); + goto out; + } + dmb->dmb_tok = cmd.response.dmb_tok; +out: + return ret; +} + +static int ism_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb) +{ + struct ism_dev *ism = smcd->priv; + union ism_unreg_dmb cmd; + int ret; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = ISM_UNREG_DMB; + cmd.request.hdr.len = sizeof(cmd.request); + + cmd.request.dmb_tok = dmb->dmb_tok; + + ret = ism_cmd(ism, &cmd); + if (ret && ret != ISM_ERROR) + goto out; + + ism_free_dmb(ism, dmb); +out: + return ret; +} + +static int ism_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id) +{ + struct ism_dev *ism = smcd->priv; + union ism_set_vlan_id cmd; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = ISM_ADD_VLAN_ID; + cmd.request.hdr.len = sizeof(cmd.request); + + cmd.request.vlan_id = vlan_id; + + return ism_cmd(ism, &cmd); +} + +static int ism_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id) +{ + struct ism_dev *ism = smcd->priv; + union ism_set_vlan_id cmd; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = ISM_DEL_VLAN_ID; + cmd.request.hdr.len = sizeof(cmd.request); + + cmd.request.vlan_id = vlan_id; + + return ism_cmd(ism, &cmd); +} + +static int ism_set_vlan_required(struct smcd_dev *smcd) +{ + return ism_cmd_simple(smcd->priv, ISM_SET_VLAN); +} + +static int ism_reset_vlan_required(struct smcd_dev *smcd) +{ + return ism_cmd_simple(smcd->priv, ISM_RESET_VLAN); +} + +static int ism_signal_ieq(struct smcd_dev *smcd, u64 rgid, u32 trigger_irq, + u32 event_code, u64 info) +{ + struct ism_dev *ism = smcd->priv; + union ism_sig_ieq cmd; + + memset(&cmd, 0, sizeof(cmd)); + cmd.request.hdr.cmd = ISM_SIGNAL_IEQ; + cmd.request.hdr.len = sizeof(cmd.request); + + cmd.request.rgid = rgid; + cmd.request.trigger_irq = trigger_irq; + cmd.request.event_code = event_code; + cmd.request.info = info; + + return ism_cmd(ism, &cmd); +} + +static unsigned int max_bytes(unsigned int start, unsigned int len, + unsigned int boundary) +{ + return min(boundary - (start & (boundary - 1)), len); +} + +static int ism_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx, + bool sf, unsigned int offset, void *data, unsigned int size) +{ + struct ism_dev *ism = smcd->priv; + unsigned int bytes; + u64 dmb_req; + int ret; + + while (size) { + bytes = max_bytes(offset, size, PAGE_SIZE); + dmb_req = ISM_CREATE_REQ(dmb_tok, idx, size == bytes ? sf : 0, + offset); + + ret = __ism_move(ism, dmb_req, data, bytes); + if (ret) + return ret; + + size -= bytes; + data += bytes; + offset += bytes; + } + + return 0; +} + +static void ism_handle_event(struct ism_dev *ism) +{ + struct smcd_event *entry; + + while ((ism->ieq_idx + 1) != READ_ONCE(ism->ieq->header.idx)) { + if (++(ism->ieq_idx) == ARRAY_SIZE(ism->ieq->entry)) + ism->ieq_idx = 0; + + entry = &ism->ieq->entry[ism->ieq_idx]; + debug_event(ism_debug_info, 2, entry, sizeof(*entry)); + smcd_handle_event(ism->smcd, entry); + } +} + +static irqreturn_t ism_handle_irq(int irq, void *data) +{ + struct ism_dev *ism = data; + unsigned long bit, end; + unsigned long *bv; + + bv = (void *) &ism->sba->dmb_bits[ISM_DMB_WORD_OFFSET]; + end = sizeof(ism->sba->dmb_bits) * BITS_PER_BYTE - ISM_DMB_BIT_OFFSET; + + spin_lock(&ism->lock); + ism->sba->s = 0; + barrier(); + for (bit = 0;;) { + bit = find_next_bit_inv(bv, end, bit); + if (bit >= end) + break; + + clear_bit_inv(bit, bv); + ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0; + barrier(); + smcd_handle_irq(ism->smcd, bit + ISM_DMB_BIT_OFFSET); + } + + if (ism->sba->e) { + ism->sba->e = 0; + barrier(); + ism_handle_event(ism); + } + spin_unlock(&ism->lock); + return IRQ_HANDLED; +} + +static const struct smcd_ops ism_ops = { + .query_remote_gid = ism_query_rgid, + .register_dmb = ism_register_dmb, + .unregister_dmb = ism_unregister_dmb, + .add_vlan_id = ism_add_vlan_id, + .del_vlan_id = ism_del_vlan_id, + .set_vlan_required = ism_set_vlan_required, + .reset_vlan_required = ism_reset_vlan_required, + .signal_event = ism_signal_ieq, + .move_data = ism_move, +}; + +static int ism_dev_init(struct ism_dev *ism) +{ + struct pci_dev *pdev = ism->pdev; + int ret; + + ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI); + if (ret <= 0) + goto out; + + ret = request_irq(pci_irq_vector(pdev, 0), ism_handle_irq, 0, + pci_name(pdev), ism); + if (ret) + goto free_vectors; + + ret = register_sba(ism); + if (ret) + goto free_irq; + + ret = register_ieq(ism); + if (ret) + goto unreg_sba; + + ret = ism_read_local_gid(ism); + if (ret) + goto unreg_ieq; + + ret = smcd_register_dev(ism->smcd); + if (ret) + goto unreg_ieq; + + query_info(ism); + return 0; + +unreg_ieq: + unregister_ieq(ism); +unreg_sba: + unregister_sba(ism); +free_irq: + free_irq(pci_irq_vector(pdev, 0), ism); +free_vectors: + pci_free_irq_vectors(pdev); +out: + return ret; +} + +static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + struct ism_dev *ism; + int ret; + + ism = kzalloc(sizeof(*ism), GFP_KERNEL); + if (!ism) + return -ENOMEM; + + spin_lock_init(&ism->lock); + dev_set_drvdata(&pdev->dev, ism); + ism->pdev = pdev; + + ret = pci_enable_device_mem(pdev); + if (ret) + goto err; + + ret = pci_request_mem_regions(pdev, DRV_NAME); + if (ret) + goto err_disable; + + ism->ctl = pci_iomap(pdev, 2, 0); + if (!ism->ctl) + goto err_resource; + + ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); + if (ret) + goto err_unmap; + + pci_set_dma_seg_boundary(pdev, SZ_1M - 1); + pci_set_dma_max_seg_size(pdev, SZ_1M); + pci_set_master(pdev); + + ism->smcd = smcd_alloc_dev(&pdev->dev, dev_name(&pdev->dev), &ism_ops, + ISM_NR_DMBS); + if (!ism->smcd) + goto err_unmap; + + ism->smcd->priv = ism; + ret = ism_dev_init(ism); + if (ret) + goto err_free; + + return 0; + +err_free: + smcd_free_dev(ism->smcd); +err_unmap: + pci_iounmap(pdev, ism->ctl); +err_resource: + pci_release_mem_regions(pdev); +err_disable: + pci_disable_device(pdev); +err: + kfree(ism); + dev_set_drvdata(&pdev->dev, NULL); + return ret; +} + +static void ism_dev_exit(struct ism_dev *ism) +{ + struct pci_dev *pdev = ism->pdev; + + smcd_unregister_dev(ism->smcd); + unregister_ieq(ism); + unregister_sba(ism); + free_irq(pci_irq_vector(pdev, 0), ism); + pci_free_irq_vectors(pdev); +} + +static void ism_remove(struct pci_dev *pdev) +{ + struct ism_dev *ism = dev_get_drvdata(&pdev->dev); + + ism_dev_exit(ism); + + smcd_free_dev(ism->smcd); + pci_iounmap(pdev, ism->ctl); + pci_release_mem_regions(pdev); + pci_disable_device(pdev); + dev_set_drvdata(&pdev->dev, NULL); + kfree(ism); +} + +static int ism_suspend(struct device *dev) +{ + struct ism_dev *ism = dev_get_drvdata(dev); + + ism_dev_exit(ism); + return 0; +} + +static int ism_resume(struct device *dev) +{ + struct ism_dev *ism = dev_get_drvdata(dev); + + return ism_dev_init(ism); +} + +static SIMPLE_DEV_PM_OPS(ism_pm_ops, ism_suspend, ism_resume); + +static struct pci_driver ism_driver = { + .name = DRV_NAME, + .id_table = ism_device_table, + .probe = ism_probe, + .remove = ism_remove, + .driver = { + .pm = &ism_pm_ops, + }, +}; + +static int __init ism_init(void) +{ + int ret; + + ism_debug_info = debug_register("ism", 2, 1, 16); + if (!ism_debug_info) + return -ENODEV; + + debug_register_view(ism_debug_info, &debug_hex_ascii_view); + ret = pci_register_driver(&ism_driver); + if (ret) + debug_unregister(ism_debug_info); + + return ret; +} + +static void __exit ism_exit(void) +{ + pci_unregister_driver(&ism_driver); + debug_unregister(ism_debug_info); +} + +module_init(ism_init); +module_exit(ism_exit); diff --git a/drivers/s390/net/lcs.c b/drivers/s390/net/lcs.c new file mode 100644 index 000000000..d8f99ff53 --- /dev/null +++ b/drivers/s390/net/lcs.c @@ -0,0 +1,2471 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Linux for S/390 Lan Channel Station Network Driver + * + * Copyright IBM Corp. 1999, 2009 + * Author(s): Original Code written by + * DJ Barrow + * Rewritten by + * Frank Pavlic and + * Martin Schwidefsky + */ + +#define KMSG_COMPONENT "lcs" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "lcs.h" + + +#if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI) +#error Cannot compile lcs.c without some net devices switched on. +#endif + +/** + * initialization string for output + */ + +static char version[] __initdata = "LCS driver"; + +/** + * the root device for lcs group devices + */ +static struct device *lcs_root_dev; + +/** + * Some prototypes. + */ +static void lcs_tasklet(unsigned long); +static void lcs_start_kernel_thread(struct work_struct *); +static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *); +#ifdef CONFIG_IP_MULTICAST +static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *); +#endif /* CONFIG_IP_MULTICAST */ +static int lcs_recovery(void *ptr); + +/** + * Debug Facility Stuff + */ +static char debug_buffer[255]; +static debug_info_t *lcs_dbf_setup; +static debug_info_t *lcs_dbf_trace; + +/** + * LCS Debug Facility functions + */ +static void +lcs_unregister_debug_facility(void) +{ + debug_unregister(lcs_dbf_setup); + debug_unregister(lcs_dbf_trace); +} + +static int +lcs_register_debug_facility(void) +{ + lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8); + lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8); + if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) { + pr_err("Not enough memory for debug facility.\n"); + lcs_unregister_debug_facility(); + return -ENOMEM; + } + debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view); + debug_set_level(lcs_dbf_setup, 2); + debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view); + debug_set_level(lcs_dbf_trace, 2); + return 0; +} + +/** + * Allocate io buffers. + */ +static int +lcs_alloc_channel(struct lcs_channel *channel) +{ + int cnt; + + LCS_DBF_TEXT(2, setup, "ichalloc"); + for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { + /* alloc memory fo iobuffer */ + channel->iob[cnt].data = + kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL); + if (channel->iob[cnt].data == NULL) + break; + channel->iob[cnt].state = LCS_BUF_STATE_EMPTY; + } + if (cnt < LCS_NUM_BUFFS) { + /* Not all io buffers could be allocated. */ + LCS_DBF_TEXT(2, setup, "echalloc"); + while (cnt-- > 0) + kfree(channel->iob[cnt].data); + return -ENOMEM; + } + return 0; +} + +/** + * Free io buffers. + */ +static void +lcs_free_channel(struct lcs_channel *channel) +{ + int cnt; + + LCS_DBF_TEXT(2, setup, "ichfree"); + for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { + kfree(channel->iob[cnt].data); + channel->iob[cnt].data = NULL; + } +} + +/* + * Cleanup channel. + */ +static void +lcs_cleanup_channel(struct lcs_channel *channel) +{ + LCS_DBF_TEXT(3, setup, "cleanch"); + /* Kill write channel tasklets. */ + tasklet_kill(&channel->irq_tasklet); + /* Free channel buffers. */ + lcs_free_channel(channel); +} + +/** + * LCS free memory for card and channels. + */ +static void +lcs_free_card(struct lcs_card *card) +{ + LCS_DBF_TEXT(2, setup, "remcard"); + LCS_DBF_HEX(2, setup, &card, sizeof(void*)); + kfree(card); +} + +/** + * LCS alloc memory for card and channels + */ +static struct lcs_card * +lcs_alloc_card(void) +{ + struct lcs_card *card; + int rc; + + LCS_DBF_TEXT(2, setup, "alloclcs"); + + card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA); + if (card == NULL) + return NULL; + card->lan_type = LCS_FRAME_TYPE_AUTO; + card->pkt_seq = 0; + card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT; + /* Allocate io buffers for the read channel. */ + rc = lcs_alloc_channel(&card->read); + if (rc){ + LCS_DBF_TEXT(2, setup, "iccwerr"); + lcs_free_card(card); + return NULL; + } + /* Allocate io buffers for the write channel. */ + rc = lcs_alloc_channel(&card->write); + if (rc) { + LCS_DBF_TEXT(2, setup, "iccwerr"); + lcs_cleanup_channel(&card->read); + lcs_free_card(card); + return NULL; + } + +#ifdef CONFIG_IP_MULTICAST + INIT_LIST_HEAD(&card->ipm_list); +#endif + LCS_DBF_HEX(2, setup, &card, sizeof(void*)); + return card; +} + +/* + * Setup read channel. + */ +static void +lcs_setup_read_ccws(struct lcs_card *card) +{ + int cnt; + + LCS_DBF_TEXT(2, setup, "ireadccw"); + /* Setup read ccws. */ + memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1)); + for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { + card->read.ccws[cnt].cmd_code = LCS_CCW_READ; + card->read.ccws[cnt].count = LCS_IOBUFFERSIZE; + card->read.ccws[cnt].flags = + CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI; + /* + * Note: we have allocated the buffer with GFP_DMA, so + * we do not need to do set_normalized_cda. + */ + card->read.ccws[cnt].cda = + (__u32) __pa(card->read.iob[cnt].data); + ((struct lcs_header *) + card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET; + card->read.iob[cnt].callback = lcs_get_frames_cb; + card->read.iob[cnt].state = LCS_BUF_STATE_READY; + card->read.iob[cnt].count = LCS_IOBUFFERSIZE; + } + card->read.ccws[0].flags &= ~CCW_FLAG_PCI; + card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI; + card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND; + /* Last ccw is a tic (transfer in channel). */ + card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER; + card->read.ccws[LCS_NUM_BUFFS].cda = + (__u32) __pa(card->read.ccws); + /* Setg initial state of the read channel. */ + card->read.state = LCS_CH_STATE_INIT; + + card->read.io_idx = 0; + card->read.buf_idx = 0; +} + +static void +lcs_setup_read(struct lcs_card *card) +{ + LCS_DBF_TEXT(3, setup, "initread"); + + lcs_setup_read_ccws(card); + /* Initialize read channel tasklet. */ + card->read.irq_tasklet.data = (unsigned long) &card->read; + card->read.irq_tasklet.func = lcs_tasklet; + /* Initialize waitqueue. */ + init_waitqueue_head(&card->read.wait_q); +} + +/* + * Setup write channel. + */ +static void +lcs_setup_write_ccws(struct lcs_card *card) +{ + int cnt; + + LCS_DBF_TEXT(3, setup, "iwritccw"); + /* Setup write ccws. */ + memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1)); + for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) { + card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE; + card->write.ccws[cnt].count = 0; + card->write.ccws[cnt].flags = + CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI; + /* + * Note: we have allocated the buffer with GFP_DMA, so + * we do not need to do set_normalized_cda. + */ + card->write.ccws[cnt].cda = + (__u32) __pa(card->write.iob[cnt].data); + } + /* Last ccw is a tic (transfer in channel). */ + card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER; + card->write.ccws[LCS_NUM_BUFFS].cda = + (__u32) __pa(card->write.ccws); + /* Set initial state of the write channel. */ + card->read.state = LCS_CH_STATE_INIT; + + card->write.io_idx = 0; + card->write.buf_idx = 0; +} + +static void +lcs_setup_write(struct lcs_card *card) +{ + LCS_DBF_TEXT(3, setup, "initwrit"); + + lcs_setup_write_ccws(card); + /* Initialize write channel tasklet. */ + card->write.irq_tasklet.data = (unsigned long) &card->write; + card->write.irq_tasklet.func = lcs_tasklet; + /* Initialize waitqueue. */ + init_waitqueue_head(&card->write.wait_q); +} + +static void +lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads) +{ + unsigned long flags; + + spin_lock_irqsave(&card->mask_lock, flags); + card->thread_allowed_mask = threads; + spin_unlock_irqrestore(&card->mask_lock, flags); + wake_up(&card->wait_q); +} +static int lcs_threads_running(struct lcs_card *card, unsigned long threads) +{ + unsigned long flags; + int rc = 0; + + spin_lock_irqsave(&card->mask_lock, flags); + rc = (card->thread_running_mask & threads); + spin_unlock_irqrestore(&card->mask_lock, flags); + return rc; +} + +static int +lcs_wait_for_threads(struct lcs_card *card, unsigned long threads) +{ + return wait_event_interruptible(card->wait_q, + lcs_threads_running(card, threads) == 0); +} + +static int lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread) +{ + unsigned long flags; + + spin_lock_irqsave(&card->mask_lock, flags); + if ( !(card->thread_allowed_mask & thread) || + (card->thread_start_mask & thread) ) { + spin_unlock_irqrestore(&card->mask_lock, flags); + return -EPERM; + } + card->thread_start_mask |= thread; + spin_unlock_irqrestore(&card->mask_lock, flags); + return 0; +} + +static void +lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread) +{ + unsigned long flags; + + spin_lock_irqsave(&card->mask_lock, flags); + card->thread_running_mask &= ~thread; + spin_unlock_irqrestore(&card->mask_lock, flags); + wake_up(&card->wait_q); +} + +static int __lcs_do_run_thread(struct lcs_card *card, unsigned long thread) +{ + unsigned long flags; + int rc = 0; + + spin_lock_irqsave(&card->mask_lock, flags); + if (card->thread_start_mask & thread){ + if ((card->thread_allowed_mask & thread) && + !(card->thread_running_mask & thread)){ + rc = 1; + card->thread_start_mask &= ~thread; + card->thread_running_mask |= thread; + } else + rc = -EPERM; + } + spin_unlock_irqrestore(&card->mask_lock, flags); + return rc; +} + +static int +lcs_do_run_thread(struct lcs_card *card, unsigned long thread) +{ + int rc = 0; + wait_event(card->wait_q, + (rc = __lcs_do_run_thread(card, thread)) >= 0); + return rc; +} + +static int +lcs_do_start_thread(struct lcs_card *card, unsigned long thread) +{ + unsigned long flags; + int rc = 0; + + spin_lock_irqsave(&card->mask_lock, flags); + LCS_DBF_TEXT_(4, trace, " %02x%02x%02x", + (u8) card->thread_start_mask, + (u8) card->thread_allowed_mask, + (u8) card->thread_running_mask); + rc = (card->thread_start_mask & thread); + spin_unlock_irqrestore(&card->mask_lock, flags); + return rc; +} + +/** + * Initialize channels,card and state machines. + */ +static void +lcs_setup_card(struct lcs_card *card) +{ + LCS_DBF_TEXT(2, setup, "initcard"); + LCS_DBF_HEX(2, setup, &card, sizeof(void*)); + + lcs_setup_read(card); + lcs_setup_write(card); + /* Set cards initial state. */ + card->state = DEV_STATE_DOWN; + card->tx_buffer = NULL; + card->tx_emitted = 0; + + init_waitqueue_head(&card->wait_q); + spin_lock_init(&card->lock); + spin_lock_init(&card->ipm_lock); + spin_lock_init(&card->mask_lock); +#ifdef CONFIG_IP_MULTICAST + INIT_LIST_HEAD(&card->ipm_list); +#endif + INIT_LIST_HEAD(&card->lancmd_waiters); +} + +static void lcs_clear_multicast_list(struct lcs_card *card) +{ +#ifdef CONFIG_IP_MULTICAST + struct lcs_ipm_list *ipm; + unsigned long flags; + + /* Free multicast list. */ + LCS_DBF_TEXT(3, setup, "clmclist"); + spin_lock_irqsave(&card->ipm_lock, flags); + while (!list_empty(&card->ipm_list)){ + ipm = list_entry(card->ipm_list.next, + struct lcs_ipm_list, list); + list_del(&ipm->list); + if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){ + spin_unlock_irqrestore(&card->ipm_lock, flags); + lcs_send_delipm(card, ipm); + spin_lock_irqsave(&card->ipm_lock, flags); + } + kfree(ipm); + } + spin_unlock_irqrestore(&card->ipm_lock, flags); +#endif +} +/** + * Cleanup channels,card and state machines. + */ +static void +lcs_cleanup_card(struct lcs_card *card) +{ + + LCS_DBF_TEXT(3, setup, "cleancrd"); + LCS_DBF_HEX(2,setup,&card,sizeof(void*)); + + if (card->dev != NULL) + free_netdev(card->dev); + /* Cleanup channels. */ + lcs_cleanup_channel(&card->write); + lcs_cleanup_channel(&card->read); +} + +/** + * Start channel. + */ +static int +lcs_start_channel(struct lcs_channel *channel) +{ + unsigned long flags; + int rc; + + LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev)); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + rc = ccw_device_start(channel->ccwdev, + channel->ccws + channel->io_idx, 0, 0, + DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND); + if (rc == 0) + channel->state = LCS_CH_STATE_RUNNING; + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + if (rc) { + LCS_DBF_TEXT_(4,trace,"essh%s", + dev_name(&channel->ccwdev->dev)); + dev_err(&channel->ccwdev->dev, + "Starting an LCS device resulted in an error," + " rc=%d!\n", rc); + } + return rc; +} + +static int +lcs_clear_channel(struct lcs_channel *channel) +{ + unsigned long flags; + int rc; + + LCS_DBF_TEXT(4,trace,"clearch"); + LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev)); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + rc = ccw_device_clear(channel->ccwdev, (addr_t) channel); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + if (rc) { + LCS_DBF_TEXT_(4, trace, "ecsc%s", + dev_name(&channel->ccwdev->dev)); + return rc; + } + wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED)); + channel->state = LCS_CH_STATE_STOPPED; + return rc; +} + + +/** + * Stop channel. + */ +static int +lcs_stop_channel(struct lcs_channel *channel) +{ + unsigned long flags; + int rc; + + if (channel->state == LCS_CH_STATE_STOPPED) + return 0; + LCS_DBF_TEXT(4,trace,"haltsch"); + LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev)); + channel->state = LCS_CH_STATE_INIT; + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + rc = ccw_device_halt(channel->ccwdev, (addr_t) channel); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + if (rc) { + LCS_DBF_TEXT_(4, trace, "ehsc%s", + dev_name(&channel->ccwdev->dev)); + return rc; + } + /* Asynchronous halt initialted. Wait for its completion. */ + wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED)); + lcs_clear_channel(channel); + return 0; +} + +/** + * start read and write channel + */ +static int +lcs_start_channels(struct lcs_card *card) +{ + int rc; + + LCS_DBF_TEXT(2, trace, "chstart"); + /* start read channel */ + rc = lcs_start_channel(&card->read); + if (rc) + return rc; + /* start write channel */ + rc = lcs_start_channel(&card->write); + if (rc) + lcs_stop_channel(&card->read); + return rc; +} + +/** + * stop read and write channel + */ +static int +lcs_stop_channels(struct lcs_card *card) +{ + LCS_DBF_TEXT(2, trace, "chhalt"); + lcs_stop_channel(&card->read); + lcs_stop_channel(&card->write); + return 0; +} + +/** + * Get empty buffer. + */ +static struct lcs_buffer * +__lcs_get_buffer(struct lcs_channel *channel) +{ + int index; + + LCS_DBF_TEXT(5, trace, "_getbuff"); + index = channel->io_idx; + do { + if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) { + channel->iob[index].state = LCS_BUF_STATE_LOCKED; + return channel->iob + index; + } + index = (index + 1) & (LCS_NUM_BUFFS - 1); + } while (index != channel->io_idx); + return NULL; +} + +static struct lcs_buffer * +lcs_get_buffer(struct lcs_channel *channel) +{ + struct lcs_buffer *buffer; + unsigned long flags; + + LCS_DBF_TEXT(5, trace, "getbuff"); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + buffer = __lcs_get_buffer(channel); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + return buffer; +} + +/** + * Resume channel program if the channel is suspended. + */ +static int +__lcs_resume_channel(struct lcs_channel *channel) +{ + int rc; + + if (channel->state != LCS_CH_STATE_SUSPENDED) + return 0; + if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND) + return 0; + LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev)); + rc = ccw_device_resume(channel->ccwdev); + if (rc) { + LCS_DBF_TEXT_(4, trace, "ersc%s", + dev_name(&channel->ccwdev->dev)); + dev_err(&channel->ccwdev->dev, + "Sending data from the LCS device to the LAN failed" + " with rc=%d\n",rc); + } else + channel->state = LCS_CH_STATE_RUNNING; + return rc; + +} + +/** + * Make a buffer ready for processing. + */ +static void __lcs_ready_buffer_bits(struct lcs_channel *channel, int index) +{ + int prev, next; + + LCS_DBF_TEXT(5, trace, "rdybits"); + prev = (index - 1) & (LCS_NUM_BUFFS - 1); + next = (index + 1) & (LCS_NUM_BUFFS - 1); + /* Check if we may clear the suspend bit of this buffer. */ + if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) { + /* Check if we have to set the PCI bit. */ + if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND)) + /* Suspend bit of the previous buffer is not set. */ + channel->ccws[index].flags |= CCW_FLAG_PCI; + /* Suspend bit of the next buffer is set. */ + channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND; + } +} + +static int +lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer) +{ + unsigned long flags; + int index, rc; + + LCS_DBF_TEXT(5, trace, "rdybuff"); + BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED && + buffer->state != LCS_BUF_STATE_PROCESSED); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + buffer->state = LCS_BUF_STATE_READY; + index = buffer - channel->iob; + /* Set length. */ + channel->ccws[index].count = buffer->count; + /* Check relevant PCI/suspend bits. */ + __lcs_ready_buffer_bits(channel, index); + rc = __lcs_resume_channel(channel); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + return rc; +} + +/** + * Mark the buffer as processed. Take care of the suspend bit + * of the previous buffer. This function is called from + * interrupt context, so the lock must not be taken. + */ +static int +__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer) +{ + int index, prev, next; + + LCS_DBF_TEXT(5, trace, "prcsbuff"); + BUG_ON(buffer->state != LCS_BUF_STATE_READY); + buffer->state = LCS_BUF_STATE_PROCESSED; + index = buffer - channel->iob; + prev = (index - 1) & (LCS_NUM_BUFFS - 1); + next = (index + 1) & (LCS_NUM_BUFFS - 1); + /* Set the suspend bit and clear the PCI bit of this buffer. */ + channel->ccws[index].flags |= CCW_FLAG_SUSPEND; + channel->ccws[index].flags &= ~CCW_FLAG_PCI; + /* Check the suspend bit of the previous buffer. */ + if (channel->iob[prev].state == LCS_BUF_STATE_READY) { + /* + * Previous buffer is in state ready. It might have + * happened in lcs_ready_buffer that the suspend bit + * has not been cleared to avoid an endless loop. + * Do it now. + */ + __lcs_ready_buffer_bits(channel, prev); + } + /* Clear PCI bit of next buffer. */ + channel->ccws[next].flags &= ~CCW_FLAG_PCI; + return __lcs_resume_channel(channel); +} + +/** + * Put a processed buffer back to state empty. + */ +static void +lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer) +{ + unsigned long flags; + + LCS_DBF_TEXT(5, trace, "relbuff"); + BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED && + buffer->state != LCS_BUF_STATE_PROCESSED); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + buffer->state = LCS_BUF_STATE_EMPTY; + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); +} + +/** + * Get buffer for a lan command. + */ +static struct lcs_buffer * +lcs_get_lancmd(struct lcs_card *card, int count) +{ + struct lcs_buffer *buffer; + struct lcs_cmd *cmd; + + LCS_DBF_TEXT(4, trace, "getlncmd"); + /* Get buffer and wait if none is available. */ + wait_event(card->write.wait_q, + ((buffer = lcs_get_buffer(&card->write)) != NULL)); + count += sizeof(struct lcs_header); + *(__u16 *)(buffer->data + count) = 0; + buffer->count = count + sizeof(__u16); + buffer->callback = lcs_release_buffer; + cmd = (struct lcs_cmd *) buffer->data; + cmd->offset = count; + cmd->type = LCS_FRAME_TYPE_CONTROL; + cmd->slot = 0; + return buffer; +} + + +static void +lcs_get_reply(struct lcs_reply *reply) +{ + refcount_inc(&reply->refcnt); +} + +static void +lcs_put_reply(struct lcs_reply *reply) +{ + if (refcount_dec_and_test(&reply->refcnt)) + kfree(reply); +} + +static struct lcs_reply * +lcs_alloc_reply(struct lcs_cmd *cmd) +{ + struct lcs_reply *reply; + + LCS_DBF_TEXT(4, trace, "getreply"); + + reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC); + if (!reply) + return NULL; + refcount_set(&reply->refcnt, 1); + reply->sequence_no = cmd->sequence_no; + reply->received = 0; + reply->rc = 0; + init_waitqueue_head(&reply->wait_q); + + return reply; +} + +/** + * Notifier function for lancmd replies. Called from read irq. + */ +static void +lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd) +{ + struct list_head *l, *n; + struct lcs_reply *reply; + + LCS_DBF_TEXT(4, trace, "notiwait"); + spin_lock(&card->lock); + list_for_each_safe(l, n, &card->lancmd_waiters) { + reply = list_entry(l, struct lcs_reply, list); + if (reply->sequence_no == cmd->sequence_no) { + lcs_get_reply(reply); + list_del_init(&reply->list); + if (reply->callback != NULL) + reply->callback(card, cmd); + reply->received = 1; + reply->rc = cmd->return_code; + wake_up(&reply->wait_q); + lcs_put_reply(reply); + break; + } + } + spin_unlock(&card->lock); +} + +/** + * Emit buffer of a lan command. + */ +static void +lcs_lancmd_timeout(struct timer_list *t) +{ + struct lcs_reply *reply = from_timer(reply, t, timer); + struct lcs_reply *list_reply, *r; + unsigned long flags; + + LCS_DBF_TEXT(4, trace, "timeout"); + spin_lock_irqsave(&reply->card->lock, flags); + list_for_each_entry_safe(list_reply, r, + &reply->card->lancmd_waiters,list) { + if (reply == list_reply) { + lcs_get_reply(reply); + list_del_init(&reply->list); + spin_unlock_irqrestore(&reply->card->lock, flags); + reply->received = 1; + reply->rc = -ETIME; + wake_up(&reply->wait_q); + lcs_put_reply(reply); + return; + } + } + spin_unlock_irqrestore(&reply->card->lock, flags); +} + +static int +lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer, + void (*reply_callback)(struct lcs_card *, struct lcs_cmd *)) +{ + struct lcs_reply *reply; + struct lcs_cmd *cmd; + unsigned long flags; + int rc; + + LCS_DBF_TEXT(4, trace, "sendcmd"); + cmd = (struct lcs_cmd *) buffer->data; + cmd->return_code = 0; + cmd->sequence_no = card->sequence_no++; + reply = lcs_alloc_reply(cmd); + if (!reply) + return -ENOMEM; + reply->callback = reply_callback; + reply->card = card; + spin_lock_irqsave(&card->lock, flags); + list_add_tail(&reply->list, &card->lancmd_waiters); + spin_unlock_irqrestore(&card->lock, flags); + + buffer->callback = lcs_release_buffer; + rc = lcs_ready_buffer(&card->write, buffer); + if (rc) + return rc; + timer_setup(&reply->timer, lcs_lancmd_timeout, 0); + mod_timer(&reply->timer, jiffies + HZ * card->lancmd_timeout); + wait_event(reply->wait_q, reply->received); + del_timer_sync(&reply->timer); + LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc); + rc = reply->rc; + lcs_put_reply(reply); + return rc ? -EIO : 0; +} + +/** + * LCS startup command + */ +static int +lcs_send_startup(struct lcs_card *card, __u8 initiator) +{ + struct lcs_buffer *buffer; + struct lcs_cmd *cmd; + + LCS_DBF_TEXT(2, trace, "startup"); + buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); + cmd = (struct lcs_cmd *) buffer->data; + cmd->cmd_code = LCS_CMD_STARTUP; + cmd->initiator = initiator; + cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE; + return lcs_send_lancmd(card, buffer, NULL); +} + +/** + * LCS shutdown command + */ +static int +lcs_send_shutdown(struct lcs_card *card) +{ + struct lcs_buffer *buffer; + struct lcs_cmd *cmd; + + LCS_DBF_TEXT(2, trace, "shutdown"); + buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); + cmd = (struct lcs_cmd *) buffer->data; + cmd->cmd_code = LCS_CMD_SHUTDOWN; + cmd->initiator = LCS_INITIATOR_TCPIP; + return lcs_send_lancmd(card, buffer, NULL); +} + +/** + * LCS lanstat command + */ +static void +__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd) +{ + LCS_DBF_TEXT(2, trace, "statcb"); + memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH); +} + +static int +lcs_send_lanstat(struct lcs_card *card) +{ + struct lcs_buffer *buffer; + struct lcs_cmd *cmd; + + LCS_DBF_TEXT(2,trace, "cmdstat"); + buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); + cmd = (struct lcs_cmd *) buffer->data; + /* Setup lanstat command. */ + cmd->cmd_code = LCS_CMD_LANSTAT; + cmd->initiator = LCS_INITIATOR_TCPIP; + cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; + cmd->cmd.lcs_std_cmd.portno = card->portno; + return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb); +} + +/** + * send stoplan command + */ +static int +lcs_send_stoplan(struct lcs_card *card, __u8 initiator) +{ + struct lcs_buffer *buffer; + struct lcs_cmd *cmd; + + LCS_DBF_TEXT(2, trace, "cmdstpln"); + buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); + cmd = (struct lcs_cmd *) buffer->data; + cmd->cmd_code = LCS_CMD_STOPLAN; + cmd->initiator = initiator; + cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; + cmd->cmd.lcs_std_cmd.portno = card->portno; + return lcs_send_lancmd(card, buffer, NULL); +} + +/** + * send startlan command + */ +static void +__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd) +{ + LCS_DBF_TEXT(2, trace, "srtlancb"); + card->lan_type = cmd->cmd.lcs_std_cmd.lan_type; + card->portno = cmd->cmd.lcs_std_cmd.portno; +} + +static int +lcs_send_startlan(struct lcs_card *card, __u8 initiator) +{ + struct lcs_buffer *buffer; + struct lcs_cmd *cmd; + + LCS_DBF_TEXT(2, trace, "cmdstaln"); + buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); + cmd = (struct lcs_cmd *) buffer->data; + cmd->cmd_code = LCS_CMD_STARTLAN; + cmd->initiator = initiator; + cmd->cmd.lcs_std_cmd.lan_type = card->lan_type; + cmd->cmd.lcs_std_cmd.portno = card->portno; + return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb); +} + +#ifdef CONFIG_IP_MULTICAST +/** + * send setipm command (Multicast) + */ +static int +lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list) +{ + struct lcs_buffer *buffer; + struct lcs_cmd *cmd; + + LCS_DBF_TEXT(2, trace, "cmdsetim"); + buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE); + cmd = (struct lcs_cmd *) buffer->data; + cmd->cmd_code = LCS_CMD_SETIPM; + cmd->initiator = LCS_INITIATOR_TCPIP; + cmd->cmd.lcs_qipassist.lan_type = card->lan_type; + cmd->cmd.lcs_qipassist.portno = card->portno; + cmd->cmd.lcs_qipassist.version = 4; + cmd->cmd.lcs_qipassist.num_ip_pairs = 1; + memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair, + &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair)); + LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr); + return lcs_send_lancmd(card, buffer, NULL); +} + +/** + * send delipm command (Multicast) + */ +static int +lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list) +{ + struct lcs_buffer *buffer; + struct lcs_cmd *cmd; + + LCS_DBF_TEXT(2, trace, "cmddelim"); + buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE); + cmd = (struct lcs_cmd *) buffer->data; + cmd->cmd_code = LCS_CMD_DELIPM; + cmd->initiator = LCS_INITIATOR_TCPIP; + cmd->cmd.lcs_qipassist.lan_type = card->lan_type; + cmd->cmd.lcs_qipassist.portno = card->portno; + cmd->cmd.lcs_qipassist.version = 4; + cmd->cmd.lcs_qipassist.num_ip_pairs = 1; + memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair, + &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair)); + LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr); + return lcs_send_lancmd(card, buffer, NULL); +} + +/** + * check if multicast is supported by LCS + */ +static void +__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd) +{ + LCS_DBF_TEXT(2, trace, "chkmccb"); + card->ip_assists_supported = + cmd->cmd.lcs_qipassist.ip_assists_supported; + card->ip_assists_enabled = + cmd->cmd.lcs_qipassist.ip_assists_enabled; +} + +static int +lcs_check_multicast_support(struct lcs_card *card) +{ + struct lcs_buffer *buffer; + struct lcs_cmd *cmd; + int rc; + + LCS_DBF_TEXT(2, trace, "cmdqipa"); + /* Send query ipassist. */ + buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE); + cmd = (struct lcs_cmd *) buffer->data; + cmd->cmd_code = LCS_CMD_QIPASSIST; + cmd->initiator = LCS_INITIATOR_TCPIP; + cmd->cmd.lcs_qipassist.lan_type = card->lan_type; + cmd->cmd.lcs_qipassist.portno = card->portno; + cmd->cmd.lcs_qipassist.version = 4; + cmd->cmd.lcs_qipassist.num_ip_pairs = 1; + rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb); + if (rc != 0) { + pr_err("Query IPAssist failed. Assuming unsupported!\n"); + return -EOPNOTSUPP; + } + if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) + return 0; + return -EOPNOTSUPP; +} + +/** + * set or del multicast address on LCS card + */ +static void +lcs_fix_multicast_list(struct lcs_card *card) +{ + struct list_head failed_list; + struct lcs_ipm_list *ipm, *tmp; + unsigned long flags; + int rc; + + LCS_DBF_TEXT(4,trace, "fixipm"); + INIT_LIST_HEAD(&failed_list); + spin_lock_irqsave(&card->ipm_lock, flags); +list_modified: + list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){ + switch (ipm->ipm_state) { + case LCS_IPM_STATE_SET_REQUIRED: + /* del from ipm_list so no one else can tamper with + * this entry */ + list_del_init(&ipm->list); + spin_unlock_irqrestore(&card->ipm_lock, flags); + rc = lcs_send_setipm(card, ipm); + spin_lock_irqsave(&card->ipm_lock, flags); + if (rc) { + pr_info("Adding multicast address failed." + " Table possibly full!\n"); + /* store ipm in failed list -> will be added + * to ipm_list again, so a retry will be done + * during the next call of this function */ + list_add_tail(&ipm->list, &failed_list); + } else { + ipm->ipm_state = LCS_IPM_STATE_ON_CARD; + /* re-insert into ipm_list */ + list_add_tail(&ipm->list, &card->ipm_list); + } + goto list_modified; + case LCS_IPM_STATE_DEL_REQUIRED: + list_del(&ipm->list); + spin_unlock_irqrestore(&card->ipm_lock, flags); + lcs_send_delipm(card, ipm); + spin_lock_irqsave(&card->ipm_lock, flags); + kfree(ipm); + goto list_modified; + case LCS_IPM_STATE_ON_CARD: + break; + } + } + /* re-insert all entries from the failed_list into ipm_list */ + list_for_each_entry_safe(ipm, tmp, &failed_list, list) + list_move_tail(&ipm->list, &card->ipm_list); + + spin_unlock_irqrestore(&card->ipm_lock, flags); +} + +/** + * get mac address for the relevant Multicast address + */ +static void +lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev) +{ + LCS_DBF_TEXT(4,trace, "getmac"); + ip_eth_mc_map(ipm, mac); +} + +/** + * function called by net device to handle multicast address relevant things + */ +static void lcs_remove_mc_addresses(struct lcs_card *card, + struct in_device *in4_dev) +{ + struct ip_mc_list *im4; + struct list_head *l; + struct lcs_ipm_list *ipm; + unsigned long flags; + char buf[MAX_ADDR_LEN]; + + LCS_DBF_TEXT(4, trace, "remmclst"); + spin_lock_irqsave(&card->ipm_lock, flags); + list_for_each(l, &card->ipm_list) { + ipm = list_entry(l, struct lcs_ipm_list, list); + for (im4 = rcu_dereference(in4_dev->mc_list); + im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) { + lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev); + if ( (ipm->ipm.ip_addr == im4->multiaddr) && + (memcmp(buf, &ipm->ipm.mac_addr, + LCS_MAC_LENGTH) == 0) ) + break; + } + if (im4 == NULL) + ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED; + } + spin_unlock_irqrestore(&card->ipm_lock, flags); +} + +static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card, + struct ip_mc_list *im4, + char *buf) +{ + struct lcs_ipm_list *tmp, *ipm = NULL; + struct list_head *l; + unsigned long flags; + + LCS_DBF_TEXT(4, trace, "chkmcent"); + spin_lock_irqsave(&card->ipm_lock, flags); + list_for_each(l, &card->ipm_list) { + tmp = list_entry(l, struct lcs_ipm_list, list); + if ( (tmp->ipm.ip_addr == im4->multiaddr) && + (memcmp(buf, &tmp->ipm.mac_addr, + LCS_MAC_LENGTH) == 0) ) { + ipm = tmp; + break; + } + } + spin_unlock_irqrestore(&card->ipm_lock, flags); + return ipm; +} + +static void lcs_set_mc_addresses(struct lcs_card *card, + struct in_device *in4_dev) +{ + + struct ip_mc_list *im4; + struct lcs_ipm_list *ipm; + char buf[MAX_ADDR_LEN]; + unsigned long flags; + + LCS_DBF_TEXT(4, trace, "setmclst"); + for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL; + im4 = rcu_dereference(im4->next_rcu)) { + lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev); + ipm = lcs_check_addr_entry(card, im4, buf); + if (ipm != NULL) + continue; /* Address already in list. */ + ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC); + if (ipm == NULL) { + pr_info("Not enough memory to add" + " new multicast entry!\n"); + break; + } + memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH); + ipm->ipm.ip_addr = im4->multiaddr; + ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED; + spin_lock_irqsave(&card->ipm_lock, flags); + LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4); + list_add(&ipm->list, &card->ipm_list); + spin_unlock_irqrestore(&card->ipm_lock, flags); + } +} + +static int +lcs_register_mc_addresses(void *data) +{ + struct lcs_card *card; + struct in_device *in4_dev; + + card = (struct lcs_card *) data; + + if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD)) + return 0; + LCS_DBF_TEXT(4, trace, "regmulti"); + + in4_dev = in_dev_get(card->dev); + if (in4_dev == NULL) + goto out; + rcu_read_lock(); + lcs_remove_mc_addresses(card,in4_dev); + lcs_set_mc_addresses(card, in4_dev); + rcu_read_unlock(); + in_dev_put(in4_dev); + + netif_carrier_off(card->dev); + netif_tx_disable(card->dev); + wait_event(card->write.wait_q, + (card->write.state != LCS_CH_STATE_RUNNING)); + lcs_fix_multicast_list(card); + if (card->state == DEV_STATE_UP) { + netif_carrier_on(card->dev); + netif_wake_queue(card->dev); + } +out: + lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD); + return 0; +} +#endif /* CONFIG_IP_MULTICAST */ + +/** + * function called by net device to + * handle multicast address relevant things + */ +static void +lcs_set_multicast_list(struct net_device *dev) +{ +#ifdef CONFIG_IP_MULTICAST + struct lcs_card *card; + + LCS_DBF_TEXT(4, trace, "setmulti"); + card = (struct lcs_card *) dev->ml_priv; + + if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD)) + schedule_work(&card->kernel_thread_starter); +#endif /* CONFIG_IP_MULTICAST */ +} + +static long +lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb) +{ + if (!IS_ERR(irb)) + return 0; + + switch (PTR_ERR(irb)) { + case -EIO: + dev_warn(&cdev->dev, + "An I/O-error occurred on the LCS device\n"); + LCS_DBF_TEXT(2, trace, "ckirberr"); + LCS_DBF_TEXT_(2, trace, " rc%d", -EIO); + break; + case -ETIMEDOUT: + dev_warn(&cdev->dev, + "A command timed out on the LCS device\n"); + LCS_DBF_TEXT(2, trace, "ckirberr"); + LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT); + break; + default: + dev_warn(&cdev->dev, + "An error occurred on the LCS device, rc=%ld\n", + PTR_ERR(irb)); + LCS_DBF_TEXT(2, trace, "ckirberr"); + LCS_DBF_TEXT(2, trace, " rc???"); + } + return PTR_ERR(irb); +} + +static int +lcs_get_problem(struct ccw_device *cdev, struct irb *irb) +{ + int dstat, cstat; + char *sense; + + sense = (char *) irb->ecw; + cstat = irb->scsw.cmd.cstat; + dstat = irb->scsw.cmd.dstat; + + if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK | + SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK | + SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) { + LCS_DBF_TEXT(2, trace, "CGENCHK"); + return 1; + } + if (dstat & DEV_STAT_UNIT_CHECK) { + if (sense[LCS_SENSE_BYTE_1] & + LCS_SENSE_RESETTING_EVENT) { + LCS_DBF_TEXT(2, trace, "REVIND"); + return 1; + } + if (sense[LCS_SENSE_BYTE_0] & + LCS_SENSE_CMD_REJECT) { + LCS_DBF_TEXT(2, trace, "CMDREJ"); + return 0; + } + if ((!sense[LCS_SENSE_BYTE_0]) && + (!sense[LCS_SENSE_BYTE_1]) && + (!sense[LCS_SENSE_BYTE_2]) && + (!sense[LCS_SENSE_BYTE_3])) { + LCS_DBF_TEXT(2, trace, "ZEROSEN"); + return 0; + } + LCS_DBF_TEXT(2, trace, "DGENCHK"); + return 1; + } + return 0; +} + +static void +lcs_schedule_recovery(struct lcs_card *card) +{ + LCS_DBF_TEXT(2, trace, "startrec"); + if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD)) + schedule_work(&card->kernel_thread_starter); +} + +/** + * IRQ Handler for LCS channels + */ +static void +lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) +{ + struct lcs_card *card; + struct lcs_channel *channel; + int rc, index; + int cstat, dstat; + + if (lcs_check_irb_error(cdev, irb)) + return; + + card = CARD_FROM_DEV(cdev); + if (card->read.ccwdev == cdev) + channel = &card->read; + else + channel = &card->write; + + cstat = irb->scsw.cmd.cstat; + dstat = irb->scsw.cmd.dstat; + LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev)); + LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat, + irb->scsw.cmd.dstat); + LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl, + irb->scsw.cmd.actl); + + /* Check for channel and device errors presented */ + rc = lcs_get_problem(cdev, irb); + if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) { + dev_warn(&cdev->dev, + "The LCS device stopped because of an error," + " dstat=0x%X, cstat=0x%X \n", + dstat, cstat); + if (rc) { + channel->state = LCS_CH_STATE_ERROR; + } + } + if (channel->state == LCS_CH_STATE_ERROR) { + lcs_schedule_recovery(card); + wake_up(&card->wait_q); + return; + } + /* How far in the ccw chain have we processed? */ + if ((channel->state != LCS_CH_STATE_INIT) && + (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) && + (irb->scsw.cmd.cpa != 0)) { + index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa) + - channel->ccws; + if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) || + (irb->scsw.cmd.cstat & SCHN_STAT_PCI)) + /* Bloody io subsystem tells us lies about cpa... */ + index = (index - 1) & (LCS_NUM_BUFFS - 1); + while (channel->io_idx != index) { + __lcs_processed_buffer(channel, + channel->iob + channel->io_idx); + channel->io_idx = + (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1); + } + } + + if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) || + (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) || + (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) + /* Mark channel as stopped. */ + channel->state = LCS_CH_STATE_STOPPED; + else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) + /* CCW execution stopped on a suspend bit. */ + channel->state = LCS_CH_STATE_SUSPENDED; + if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) { + if (irb->scsw.cmd.cc != 0) { + ccw_device_halt(channel->ccwdev, (addr_t) channel); + return; + } + /* The channel has been stopped by halt_IO. */ + channel->state = LCS_CH_STATE_HALTED; + } + if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC) + channel->state = LCS_CH_STATE_CLEARED; + /* Do the rest in the tasklet. */ + tasklet_schedule(&channel->irq_tasklet); +} + +/** + * Tasklet for IRQ handler + */ +static void +lcs_tasklet(unsigned long data) +{ + unsigned long flags; + struct lcs_channel *channel; + struct lcs_buffer *iob; + int buf_idx; + + channel = (struct lcs_channel *) data; + LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev)); + + /* Check for processed buffers. */ + iob = channel->iob; + buf_idx = channel->buf_idx; + while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) { + /* Do the callback thing. */ + if (iob[buf_idx].callback != NULL) + iob[buf_idx].callback(channel, iob + buf_idx); + buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1); + } + channel->buf_idx = buf_idx; + + if (channel->state == LCS_CH_STATE_STOPPED) + lcs_start_channel(channel); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + if (channel->state == LCS_CH_STATE_SUSPENDED && + channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) + __lcs_resume_channel(channel); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + + /* Something happened on the channel. Wake up waiters. */ + wake_up(&channel->wait_q); +} + +/** + * Finish current tx buffer and make it ready for transmit. + */ +static void +__lcs_emit_txbuffer(struct lcs_card *card) +{ + LCS_DBF_TEXT(5, trace, "emittx"); + *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0; + card->tx_buffer->count += 2; + lcs_ready_buffer(&card->write, card->tx_buffer); + card->tx_buffer = NULL; + card->tx_emitted++; +} + +/** + * Callback for finished tx buffers. + */ +static void +lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer) +{ + struct lcs_card *card; + + LCS_DBF_TEXT(5, trace, "txbuffcb"); + /* Put buffer back to pool. */ + lcs_release_buffer(channel, buffer); + card = container_of(channel, struct lcs_card, write); + if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev)) + netif_wake_queue(card->dev); + spin_lock(&card->lock); + card->tx_emitted--; + if (card->tx_emitted <= 0 && card->tx_buffer != NULL) + /* + * Last running tx buffer has finished. Submit partially + * filled current buffer. + */ + __lcs_emit_txbuffer(card); + spin_unlock(&card->lock); +} + +/** + * Packet transmit function called by network stack + */ +static int +__lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb, + struct net_device *dev) +{ + struct lcs_header *header; + int rc = NETDEV_TX_OK; + + LCS_DBF_TEXT(5, trace, "hardxmit"); + if (skb == NULL) { + card->stats.tx_dropped++; + card->stats.tx_errors++; + return NETDEV_TX_OK; + } + if (card->state != DEV_STATE_UP) { + dev_kfree_skb(skb); + card->stats.tx_dropped++; + card->stats.tx_errors++; + card->stats.tx_carrier_errors++; + return NETDEV_TX_OK; + } + if (skb->protocol == htons(ETH_P_IPV6)) { + dev_kfree_skb(skb); + return NETDEV_TX_OK; + } + netif_stop_queue(card->dev); + spin_lock(&card->lock); + if (card->tx_buffer != NULL && + card->tx_buffer->count + sizeof(struct lcs_header) + + skb->len + sizeof(u16) > LCS_IOBUFFERSIZE) + /* skb too big for current tx buffer. */ + __lcs_emit_txbuffer(card); + if (card->tx_buffer == NULL) { + /* Get new tx buffer */ + card->tx_buffer = lcs_get_buffer(&card->write); + if (card->tx_buffer == NULL) { + card->stats.tx_dropped++; + rc = NETDEV_TX_BUSY; + goto out; + } + card->tx_buffer->callback = lcs_txbuffer_cb; + card->tx_buffer->count = 0; + } + header = (struct lcs_header *) + (card->tx_buffer->data + card->tx_buffer->count); + card->tx_buffer->count += skb->len + sizeof(struct lcs_header); + header->offset = card->tx_buffer->count; + header->type = card->lan_type; + header->slot = card->portno; + skb_copy_from_linear_data(skb, header + 1, skb->len); + spin_unlock(&card->lock); + card->stats.tx_bytes += skb->len; + card->stats.tx_packets++; + dev_kfree_skb(skb); + netif_wake_queue(card->dev); + spin_lock(&card->lock); + if (card->tx_emitted <= 0 && card->tx_buffer != NULL) + /* If this is the first tx buffer emit it immediately. */ + __lcs_emit_txbuffer(card); +out: + spin_unlock(&card->lock); + return rc; +} + +static int +lcs_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct lcs_card *card; + int rc; + + LCS_DBF_TEXT(5, trace, "pktxmit"); + card = (struct lcs_card *) dev->ml_priv; + rc = __lcs_start_xmit(card, skb, dev); + return rc; +} + +/** + * send startlan and lanstat command to make LCS device ready + */ +static int +lcs_startlan_auto(struct lcs_card *card) +{ + int rc; + + LCS_DBF_TEXT(2, trace, "strtauto"); +#ifdef CONFIG_ETHERNET + card->lan_type = LCS_FRAME_TYPE_ENET; + rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); + if (rc == 0) + return 0; + +#endif +#ifdef CONFIG_FDDI + card->lan_type = LCS_FRAME_TYPE_FDDI; + rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); + if (rc == 0) + return 0; +#endif + return -EIO; +} + +static int +lcs_startlan(struct lcs_card *card) +{ + int rc, i; + + LCS_DBF_TEXT(2, trace, "startlan"); + rc = 0; + if (card->portno != LCS_INVALID_PORT_NO) { + if (card->lan_type == LCS_FRAME_TYPE_AUTO) + rc = lcs_startlan_auto(card); + else + rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); + } else { + for (i = 0; i <= 16; i++) { + card->portno = i; + if (card->lan_type != LCS_FRAME_TYPE_AUTO) + rc = lcs_send_startlan(card, + LCS_INITIATOR_TCPIP); + else + /* autodetecting lan type */ + rc = lcs_startlan_auto(card); + if (rc == 0) + break; + } + } + if (rc == 0) + return lcs_send_lanstat(card); + return rc; +} + +/** + * LCS detect function + * setup channels and make them I/O ready + */ +static int +lcs_detect(struct lcs_card *card) +{ + int rc = 0; + + LCS_DBF_TEXT(2, setup, "lcsdetct"); + /* start/reset card */ + if (card->dev) + netif_stop_queue(card->dev); + rc = lcs_stop_channels(card); + if (rc == 0) { + rc = lcs_start_channels(card); + if (rc == 0) { + rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP); + if (rc == 0) + rc = lcs_startlan(card); + } + } + if (rc == 0) { + card->state = DEV_STATE_UP; + } else { + card->state = DEV_STATE_DOWN; + card->write.state = LCS_CH_STATE_INIT; + card->read.state = LCS_CH_STATE_INIT; + } + return rc; +} + +/** + * LCS Stop card + */ +static int +lcs_stopcard(struct lcs_card *card) +{ + int rc; + + LCS_DBF_TEXT(3, setup, "stopcard"); + + if (card->read.state != LCS_CH_STATE_STOPPED && + card->write.state != LCS_CH_STATE_STOPPED && + card->read.state != LCS_CH_STATE_ERROR && + card->write.state != LCS_CH_STATE_ERROR && + card->state == DEV_STATE_UP) { + lcs_clear_multicast_list(card); + rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP); + rc = lcs_send_shutdown(card); + } + rc = lcs_stop_channels(card); + card->state = DEV_STATE_DOWN; + + return rc; +} + +/** + * Kernel Thread helper functions for LGW initiated commands + */ +static void +lcs_start_kernel_thread(struct work_struct *work) +{ + struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter); + LCS_DBF_TEXT(5, trace, "krnthrd"); + if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD)) + kthread_run(lcs_recovery, card, "lcs_recover"); +#ifdef CONFIG_IP_MULTICAST + if (lcs_do_start_thread(card, LCS_SET_MC_THREAD)) + kthread_run(lcs_register_mc_addresses, card, "regipm"); +#endif +} + +/** + * Process control frames. + */ +static void +lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd) +{ + LCS_DBF_TEXT(5, trace, "getctrl"); + if (cmd->initiator == LCS_INITIATOR_LGW) { + switch(cmd->cmd_code) { + case LCS_CMD_STARTUP: + case LCS_CMD_STARTLAN: + lcs_schedule_recovery(card); + break; + case LCS_CMD_STOPLAN: + if (card->dev) { + pr_warn("Stoplan for %s initiated by LGW\n", + card->dev->name); + netif_carrier_off(card->dev); + } + break; + default: + LCS_DBF_TEXT(5, trace, "noLGWcmd"); + break; + } + } else + lcs_notify_lancmd_waiters(card, cmd); +} + +/** + * Unpack network packet. + */ +static void +lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len) +{ + struct sk_buff *skb; + + LCS_DBF_TEXT(5, trace, "getskb"); + if (card->dev == NULL || + card->state != DEV_STATE_UP) + /* The card isn't up. Ignore the packet. */ + return; + + skb = dev_alloc_skb(skb_len); + if (skb == NULL) { + dev_err(&card->dev->dev, + " Allocating a socket buffer to interface %s failed\n", + card->dev->name); + card->stats.rx_dropped++; + return; + } + skb_put_data(skb, skb_data, skb_len); + skb->protocol = card->lan_type_trans(skb, card->dev); + card->stats.rx_bytes += skb_len; + card->stats.rx_packets++; + if (skb->protocol == htons(ETH_P_802_2)) + *((__u32 *)skb->cb) = ++card->pkt_seq; + netif_rx(skb); +} + +/** + * LCS main routine to get packets and lancmd replies from the buffers + */ +static void +lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer) +{ + struct lcs_card *card; + struct lcs_header *lcs_hdr; + __u16 offset; + + LCS_DBF_TEXT(5, trace, "lcsgtpkt"); + lcs_hdr = (struct lcs_header *) buffer->data; + if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) { + LCS_DBF_TEXT(4, trace, "-eiogpkt"); + return; + } + card = container_of(channel, struct lcs_card, read); + offset = 0; + while (lcs_hdr->offset != 0) { + if (lcs_hdr->offset <= 0 || + lcs_hdr->offset > LCS_IOBUFFERSIZE || + lcs_hdr->offset < offset) { + /* Offset invalid. */ + card->stats.rx_length_errors++; + card->stats.rx_errors++; + return; + } + /* What kind of frame is it? */ + if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL) + /* Control frame. */ + lcs_get_control(card, (struct lcs_cmd *) lcs_hdr); + else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET || + lcs_hdr->type == LCS_FRAME_TYPE_TR || + lcs_hdr->type == LCS_FRAME_TYPE_FDDI) + /* Normal network packet. */ + lcs_get_skb(card, (char *)(lcs_hdr + 1), + lcs_hdr->offset - offset - + sizeof(struct lcs_header)); + else + /* Unknown frame type. */ + ; // FIXME: error message ? + /* Proceed to next frame. */ + offset = lcs_hdr->offset; + lcs_hdr->offset = LCS_ILLEGAL_OFFSET; + lcs_hdr = (struct lcs_header *) (buffer->data + offset); + } + /* The buffer is now empty. Make it ready again. */ + lcs_ready_buffer(&card->read, buffer); +} + +/** + * get network statistics for ifconfig and other user programs + */ +static struct net_device_stats * +lcs_getstats(struct net_device *dev) +{ + struct lcs_card *card; + + LCS_DBF_TEXT(4, trace, "netstats"); + card = (struct lcs_card *) dev->ml_priv; + return &card->stats; +} + +/** + * stop lcs device + * This function will be called by user doing ifconfig xxx down + */ +static int +lcs_stop_device(struct net_device *dev) +{ + struct lcs_card *card; + int rc; + + LCS_DBF_TEXT(2, trace, "stopdev"); + card = (struct lcs_card *) dev->ml_priv; + netif_carrier_off(dev); + netif_tx_disable(dev); + dev->flags &= ~IFF_UP; + wait_event(card->write.wait_q, + (card->write.state != LCS_CH_STATE_RUNNING)); + rc = lcs_stopcard(card); + if (rc) + dev_err(&card->dev->dev, + " Shutting down the LCS device failed\n"); + return rc; +} + +/** + * start lcs device and make it runnable + * This function will be called by user doing ifconfig xxx up + */ +static int +lcs_open_device(struct net_device *dev) +{ + struct lcs_card *card; + int rc; + + LCS_DBF_TEXT(2, trace, "opendev"); + card = (struct lcs_card *) dev->ml_priv; + /* initialize statistics */ + rc = lcs_detect(card); + if (rc) { + pr_err("Error in opening device!\n"); + + } else { + dev->flags |= IFF_UP; + netif_carrier_on(dev); + netif_wake_queue(dev); + card->state = DEV_STATE_UP; + } + return rc; +} + +/** + * show function for portno called by cat or similar things + */ +static ssize_t +lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf) +{ + struct lcs_card *card; + + card = dev_get_drvdata(dev); + + if (!card) + return 0; + + return sprintf(buf, "%d\n", card->portno); +} + +/** + * store the value which is piped to file portno + */ +static ssize_t +lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + struct lcs_card *card; + int rc; + s16 value; + + card = dev_get_drvdata(dev); + + if (!card) + return 0; + + rc = kstrtos16(buf, 0, &value); + if (rc) + return -EINVAL; + /* TODO: sanity checks */ + card->portno = value; + if (card->dev) + card->dev->dev_port = card->portno; + + return count; + +} + +static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store); + +static const char *lcs_type[] = { + "not a channel", + "2216 parallel", + "2216 channel", + "OSA LCS card", + "unknown channel type", + "unsupported channel type", +}; + +static ssize_t +lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct ccwgroup_device *cgdev; + + cgdev = to_ccwgroupdev(dev); + if (!cgdev) + return -ENODEV; + + return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]); +} + +static DEVICE_ATTR(type, 0444, lcs_type_show, NULL); + +static ssize_t +lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct lcs_card *card; + + card = dev_get_drvdata(dev); + + return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0; +} + +static ssize_t +lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + struct lcs_card *card; + unsigned int value; + int rc; + + card = dev_get_drvdata(dev); + + if (!card) + return 0; + + rc = kstrtouint(buf, 0, &value); + if (rc) + return -EINVAL; + /* TODO: sanity checks */ + card->lancmd_timeout = value; + + return count; + +} + +static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store); + +static ssize_t +lcs_dev_recover_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct lcs_card *card = dev_get_drvdata(dev); + char *tmp; + int i; + + if (!card) + return -EINVAL; + if (card->state != DEV_STATE_UP) + return -EPERM; + i = simple_strtoul(buf, &tmp, 16); + if (i == 1) + lcs_schedule_recovery(card); + return count; +} + +static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store); + +static struct attribute * lcs_attrs[] = { + &dev_attr_portno.attr, + &dev_attr_type.attr, + &dev_attr_lancmd_timeout.attr, + &dev_attr_recover.attr, + NULL, +}; +static struct attribute_group lcs_attr_group = { + .attrs = lcs_attrs, +}; +static const struct attribute_group *lcs_attr_groups[] = { + &lcs_attr_group, + NULL, +}; +static const struct device_type lcs_devtype = { + .name = "lcs", + .groups = lcs_attr_groups, +}; + +/** + * lcs_probe_device is called on establishing a new ccwgroup_device. + */ +static int +lcs_probe_device(struct ccwgroup_device *ccwgdev) +{ + struct lcs_card *card; + + if (!get_device(&ccwgdev->dev)) + return -ENODEV; + + LCS_DBF_TEXT(2, setup, "add_dev"); + card = lcs_alloc_card(); + if (!card) { + LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM); + put_device(&ccwgdev->dev); + return -ENOMEM; + } + dev_set_drvdata(&ccwgdev->dev, card); + ccwgdev->cdev[0]->handler = lcs_irq; + ccwgdev->cdev[1]->handler = lcs_irq; + card->gdev = ccwgdev; + INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread); + card->thread_start_mask = 0; + card->thread_allowed_mask = 0; + card->thread_running_mask = 0; + ccwgdev->dev.type = &lcs_devtype; + + return 0; +} + +static int +lcs_register_netdev(struct ccwgroup_device *ccwgdev) +{ + struct lcs_card *card; + + LCS_DBF_TEXT(2, setup, "regnetdv"); + card = dev_get_drvdata(&ccwgdev->dev); + if (card->dev->reg_state != NETREG_UNINITIALIZED) + return 0; + SET_NETDEV_DEV(card->dev, &ccwgdev->dev); + return register_netdev(card->dev); +} + +/** + * lcs_new_device will be called by setting the group device online. + */ +static const struct net_device_ops lcs_netdev_ops = { + .ndo_open = lcs_open_device, + .ndo_stop = lcs_stop_device, + .ndo_get_stats = lcs_getstats, + .ndo_start_xmit = lcs_start_xmit, +}; + +static const struct net_device_ops lcs_mc_netdev_ops = { + .ndo_open = lcs_open_device, + .ndo_stop = lcs_stop_device, + .ndo_get_stats = lcs_getstats, + .ndo_start_xmit = lcs_start_xmit, + .ndo_set_rx_mode = lcs_set_multicast_list, +}; + +static int +lcs_new_device(struct ccwgroup_device *ccwgdev) +{ + struct lcs_card *card; + struct net_device *dev=NULL; + enum lcs_dev_states recover_state; + int rc; + + card = dev_get_drvdata(&ccwgdev->dev); + if (!card) + return -ENODEV; + + LCS_DBF_TEXT(2, setup, "newdev"); + LCS_DBF_HEX(3, setup, &card, sizeof(void*)); + card->read.ccwdev = ccwgdev->cdev[0]; + card->write.ccwdev = ccwgdev->cdev[1]; + + recover_state = card->state; + rc = ccw_device_set_online(card->read.ccwdev); + if (rc) + goto out_err; + rc = ccw_device_set_online(card->write.ccwdev); + if (rc) + goto out_werr; + + LCS_DBF_TEXT(3, setup, "lcsnewdv"); + + lcs_setup_card(card); + rc = lcs_detect(card); + if (rc) { + LCS_DBF_TEXT(2, setup, "dtctfail"); + dev_err(&ccwgdev->dev, + "Detecting a network adapter for LCS devices" + " failed with rc=%d (0x%x)\n", rc, rc); + lcs_stopcard(card); + goto out; + } + if (card->dev) { + LCS_DBF_TEXT(2, setup, "samedev"); + LCS_DBF_HEX(3, setup, &card, sizeof(void*)); + goto netdev_out; + } + switch (card->lan_type) { +#ifdef CONFIG_ETHERNET + case LCS_FRAME_TYPE_ENET: + card->lan_type_trans = eth_type_trans; + dev = alloc_etherdev(0); + break; +#endif +#ifdef CONFIG_FDDI + case LCS_FRAME_TYPE_FDDI: + card->lan_type_trans = fddi_type_trans; + dev = alloc_fddidev(0); + break; +#endif + default: + LCS_DBF_TEXT(3, setup, "errinit"); + pr_err(" Initialization failed\n"); + goto out; + } + if (!dev) + goto out; + card->dev = dev; + card->dev->ml_priv = card; + card->dev->netdev_ops = &lcs_netdev_ops; + card->dev->dev_port = card->portno; + memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH); +#ifdef CONFIG_IP_MULTICAST + if (!lcs_check_multicast_support(card)) + card->dev->netdev_ops = &lcs_mc_netdev_ops; +#endif +netdev_out: + lcs_set_allowed_threads(card,0xffffffff); + if (recover_state == DEV_STATE_RECOVER) { + lcs_set_multicast_list(card->dev); + card->dev->flags |= IFF_UP; + netif_carrier_on(card->dev); + netif_wake_queue(card->dev); + card->state = DEV_STATE_UP; + } else { + lcs_stopcard(card); + } + + if (lcs_register_netdev(ccwgdev) != 0) + goto out; + + /* Print out supported assists: IPv6 */ + pr_info("LCS device %s %s IPv6 support\n", card->dev->name, + (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ? + "with" : "without"); + /* Print out supported assist: Multicast */ + pr_info("LCS device %s %s Multicast support\n", card->dev->name, + (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ? + "with" : "without"); + return 0; +out: + + ccw_device_set_offline(card->write.ccwdev); +out_werr: + ccw_device_set_offline(card->read.ccwdev); +out_err: + return -ENODEV; +} + +/** + * lcs_shutdown_device, called when setting the group device offline. + */ +static int +__lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode) +{ + struct lcs_card *card; + enum lcs_dev_states recover_state; + int ret = 0, ret2 = 0, ret3 = 0; + + LCS_DBF_TEXT(3, setup, "shtdndev"); + card = dev_get_drvdata(&ccwgdev->dev); + if (!card) + return -ENODEV; + if (recovery_mode == 0) { + lcs_set_allowed_threads(card, 0); + if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD)) + return -ERESTARTSYS; + } + LCS_DBF_HEX(3, setup, &card, sizeof(void*)); + recover_state = card->state; + + ret = lcs_stop_device(card->dev); + ret2 = ccw_device_set_offline(card->read.ccwdev); + ret3 = ccw_device_set_offline(card->write.ccwdev); + if (!ret) + ret = (ret2) ? ret2 : ret3; + if (ret) + LCS_DBF_TEXT_(3, setup, "1err:%d", ret); + if (recover_state == DEV_STATE_UP) { + card->state = DEV_STATE_RECOVER; + } + return 0; +} + +static int +lcs_shutdown_device(struct ccwgroup_device *ccwgdev) +{ + return __lcs_shutdown_device(ccwgdev, 0); +} + +/** + * drive lcs recovery after startup and startlan initiated by Lan Gateway + */ +static int +lcs_recovery(void *ptr) +{ + struct lcs_card *card; + struct ccwgroup_device *gdev; + int rc; + + card = (struct lcs_card *) ptr; + + LCS_DBF_TEXT(4, trace, "recover1"); + if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD)) + return 0; + LCS_DBF_TEXT(4, trace, "recover2"); + gdev = card->gdev; + dev_warn(&gdev->dev, + "A recovery process has been started for the LCS device\n"); + rc = __lcs_shutdown_device(gdev, 1); + rc = lcs_new_device(gdev); + if (!rc) + pr_info("Device %s successfully recovered!\n", + card->dev->name); + else + pr_info("Device %s could not be recovered!\n", + card->dev->name); + lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD); + return 0; +} + +/** + * lcs_remove_device, free buffers and card + */ +static void +lcs_remove_device(struct ccwgroup_device *ccwgdev) +{ + struct lcs_card *card; + + card = dev_get_drvdata(&ccwgdev->dev); + if (!card) + return; + + LCS_DBF_TEXT(3, setup, "remdev"); + LCS_DBF_HEX(3, setup, &card, sizeof(void*)); + if (ccwgdev->state == CCWGROUP_ONLINE) { + lcs_shutdown_device(ccwgdev); + } + if (card->dev) + unregister_netdev(card->dev); + lcs_cleanup_card(card); + lcs_free_card(card); + dev_set_drvdata(&ccwgdev->dev, NULL); + put_device(&ccwgdev->dev); +} + +static int lcs_pm_suspend(struct lcs_card *card) +{ + if (card->dev) + netif_device_detach(card->dev); + lcs_set_allowed_threads(card, 0); + lcs_wait_for_threads(card, 0xffffffff); + if (card->state != DEV_STATE_DOWN) + __lcs_shutdown_device(card->gdev, 1); + return 0; +} + +static int lcs_pm_resume(struct lcs_card *card) +{ + int rc = 0; + + if (card->state == DEV_STATE_RECOVER) + rc = lcs_new_device(card->gdev); + if (card->dev) + netif_device_attach(card->dev); + if (rc) { + dev_warn(&card->gdev->dev, "The lcs device driver " + "failed to recover the device\n"); + } + return rc; +} + +static int lcs_prepare(struct ccwgroup_device *gdev) +{ + return 0; +} + +static void lcs_complete(struct ccwgroup_device *gdev) +{ + return; +} + +static int lcs_freeze(struct ccwgroup_device *gdev) +{ + struct lcs_card *card = dev_get_drvdata(&gdev->dev); + return lcs_pm_suspend(card); +} + +static int lcs_thaw(struct ccwgroup_device *gdev) +{ + struct lcs_card *card = dev_get_drvdata(&gdev->dev); + return lcs_pm_resume(card); +} + +static int lcs_restore(struct ccwgroup_device *gdev) +{ + struct lcs_card *card = dev_get_drvdata(&gdev->dev); + return lcs_pm_resume(card); +} + +static struct ccw_device_id lcs_ids[] = { + {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel}, + {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216}, + {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2}, + {}, +}; +MODULE_DEVICE_TABLE(ccw, lcs_ids); + +static struct ccw_driver lcs_ccw_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "lcs", + }, + .ids = lcs_ids, + .probe = ccwgroup_probe_ccwdev, + .remove = ccwgroup_remove_ccwdev, + .int_class = IRQIO_LCS, +}; + +/** + * LCS ccwgroup driver registration + */ +static struct ccwgroup_driver lcs_group_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "lcs", + }, + .ccw_driver = &lcs_ccw_driver, + .setup = lcs_probe_device, + .remove = lcs_remove_device, + .set_online = lcs_new_device, + .set_offline = lcs_shutdown_device, + .prepare = lcs_prepare, + .complete = lcs_complete, + .freeze = lcs_freeze, + .thaw = lcs_thaw, + .restore = lcs_restore, +}; + +static ssize_t group_store(struct device_driver *ddrv, const char *buf, + size_t count) +{ + int err; + err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf); + return err ? err : count; +} +static DRIVER_ATTR_WO(group); + +static struct attribute *lcs_drv_attrs[] = { + &driver_attr_group.attr, + NULL, +}; +static struct attribute_group lcs_drv_attr_group = { + .attrs = lcs_drv_attrs, +}; +static const struct attribute_group *lcs_drv_attr_groups[] = { + &lcs_drv_attr_group, + NULL, +}; + +/** + * LCS Module/Kernel initialization function + */ +static int +__init lcs_init_module(void) +{ + int rc; + + pr_info("Loading %s\n", version); + rc = lcs_register_debug_facility(); + LCS_DBF_TEXT(0, setup, "lcsinit"); + if (rc) + goto out_err; + lcs_root_dev = root_device_register("lcs"); + rc = PTR_ERR_OR_ZERO(lcs_root_dev); + if (rc) + goto register_err; + rc = ccw_driver_register(&lcs_ccw_driver); + if (rc) + goto ccw_err; + lcs_group_driver.driver.groups = lcs_drv_attr_groups; + rc = ccwgroup_driver_register(&lcs_group_driver); + if (rc) + goto ccwgroup_err; + return 0; + +ccwgroup_err: + ccw_driver_unregister(&lcs_ccw_driver); +ccw_err: + root_device_unregister(lcs_root_dev); +register_err: + lcs_unregister_debug_facility(); +out_err: + pr_err("Initializing the lcs device driver failed\n"); + return rc; +} + + +/** + * LCS module cleanup function + */ +static void +__exit lcs_cleanup_module(void) +{ + pr_info("Terminating lcs module.\n"); + LCS_DBF_TEXT(0, trace, "cleanup"); + ccwgroup_driver_unregister(&lcs_group_driver); + ccw_driver_unregister(&lcs_ccw_driver); + root_device_unregister(lcs_root_dev); + lcs_unregister_debug_facility(); +} + +module_init(lcs_init_module); +module_exit(lcs_cleanup_module); + +MODULE_AUTHOR("Frank Pavlic "); +MODULE_LICENSE("GPL"); + diff --git a/drivers/s390/net/lcs.h b/drivers/s390/net/lcs.h new file mode 100644 index 000000000..bd52caa3b --- /dev/null +++ b/drivers/s390/net/lcs.h @@ -0,0 +1,342 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/*lcs.h*/ + +#include +#include +#include +#include +#include +#include + +#define LCS_DBF_TEXT(level, name, text) \ + do { \ + debug_text_event(lcs_dbf_##name, level, text); \ + } while (0) + +#define LCS_DBF_HEX(level,name,addr,len) \ +do { \ + debug_event(lcs_dbf_##name,level,(void*)(addr),len); \ +} while (0) + +#define LCS_DBF_TEXT_(level,name,text...) \ + do { \ + if (debug_level_enabled(lcs_dbf_##name, level)) { \ + sprintf(debug_buffer, text); \ + debug_text_event(lcs_dbf_##name, level, debug_buffer); \ + } \ + } while (0) + +/** + * sysfs related stuff + */ +#define CARD_FROM_DEV(cdev) \ + (struct lcs_card *) dev_get_drvdata( \ + &((struct ccwgroup_device *)dev_get_drvdata(&cdev->dev))->dev); + +/** + * Enum for classifying detected devices. + */ +enum lcs_channel_types { + /* Device is not a channel */ + lcs_channel_type_none, + + /* Device is a 2216 channel */ + lcs_channel_type_parallel, + + /* Device is a 2216 channel */ + lcs_channel_type_2216, + + /* Device is a OSA2 card */ + lcs_channel_type_osa2 +}; + +/** + * CCW commands used in this driver + */ +#define LCS_CCW_WRITE 0x01 +#define LCS_CCW_READ 0x02 +#define LCS_CCW_TRANSFER 0x08 + +/** + * LCS device status primitives + */ +#define LCS_CMD_STARTLAN 0x01 +#define LCS_CMD_STOPLAN 0x02 +#define LCS_CMD_LANSTAT 0x04 +#define LCS_CMD_STARTUP 0x07 +#define LCS_CMD_SHUTDOWN 0x08 +#define LCS_CMD_QIPASSIST 0xb2 +#define LCS_CMD_SETIPM 0xb4 +#define LCS_CMD_DELIPM 0xb5 + +#define LCS_INITIATOR_TCPIP 0x00 +#define LCS_INITIATOR_LGW 0x01 +#define LCS_STD_CMD_SIZE 16 +#define LCS_MULTICAST_CMD_SIZE 404 + +/** + * LCS IPASSIST MASKS,only used when multicast is switched on + */ +/* Not supported by LCS */ +#define LCS_IPASS_ARP_PROCESSING 0x0001 +#define LCS_IPASS_IN_CHECKSUM_SUPPORT 0x0002 +#define LCS_IPASS_OUT_CHECKSUM_SUPPORT 0x0004 +#define LCS_IPASS_IP_FRAG_REASSEMBLY 0x0008 +#define LCS_IPASS_IP_FILTERING 0x0010 +/* Supported by lcs 3172 */ +#define LCS_IPASS_IPV6_SUPPORT 0x0020 +#define LCS_IPASS_MULTICAST_SUPPORT 0x0040 + +/** + * LCS sense byte definitions + */ +#define LCS_SENSE_BYTE_0 0 +#define LCS_SENSE_BYTE_1 1 +#define LCS_SENSE_BYTE_2 2 +#define LCS_SENSE_BYTE_3 3 +#define LCS_SENSE_INTERFACE_DISCONNECT 0x01 +#define LCS_SENSE_EQUIPMENT_CHECK 0x10 +#define LCS_SENSE_BUS_OUT_CHECK 0x20 +#define LCS_SENSE_INTERVENTION_REQUIRED 0x40 +#define LCS_SENSE_CMD_REJECT 0x80 +#define LCS_SENSE_RESETTING_EVENT 0x80 +#define LCS_SENSE_DEVICE_ONLINE 0x20 + +/** + * LCS packet type definitions + */ +#define LCS_FRAME_TYPE_CONTROL 0 +#define LCS_FRAME_TYPE_ENET 1 +#define LCS_FRAME_TYPE_TR 2 +#define LCS_FRAME_TYPE_FDDI 7 +#define LCS_FRAME_TYPE_AUTO -1 + +/** + * some more definitions,we will sort them later + */ +#define LCS_ILLEGAL_OFFSET 0xffff +#define LCS_IOBUFFERSIZE 0x5000 +#define LCS_NUM_BUFFS 32 /* needs to be power of 2 */ +#define LCS_MAC_LENGTH 6 +#define LCS_INVALID_PORT_NO -1 +#define LCS_LANCMD_TIMEOUT_DEFAULT 5 + +/** + * Multicast state + */ +#define LCS_IPM_STATE_SET_REQUIRED 0 +#define LCS_IPM_STATE_DEL_REQUIRED 1 +#define LCS_IPM_STATE_ON_CARD 2 + +/** + * LCS IP Assist declarations + * seems to be only used for multicast + */ +#define LCS_IPASS_ARP_PROCESSING 0x0001 +#define LCS_IPASS_INBOUND_CSUM_SUPP 0x0002 +#define LCS_IPASS_OUTBOUND_CSUM_SUPP 0x0004 +#define LCS_IPASS_IP_FRAG_REASSEMBLY 0x0008 +#define LCS_IPASS_IP_FILTERING 0x0010 +#define LCS_IPASS_IPV6_SUPPORT 0x0020 +#define LCS_IPASS_MULTICAST_SUPPORT 0x0040 + +/** + * LCS Buffer states + */ +enum lcs_buffer_states { + LCS_BUF_STATE_EMPTY, /* buffer is empty */ + LCS_BUF_STATE_LOCKED, /* buffer is locked, don't touch */ + LCS_BUF_STATE_READY, /* buffer is ready for read/write */ + LCS_BUF_STATE_PROCESSED, +}; + +/** + * LCS Channel State Machine declarations + */ +enum lcs_channel_states { + LCS_CH_STATE_INIT, + LCS_CH_STATE_HALTED, + LCS_CH_STATE_STOPPED, + LCS_CH_STATE_RUNNING, + LCS_CH_STATE_SUSPENDED, + LCS_CH_STATE_CLEARED, + LCS_CH_STATE_ERROR, +}; + +/** + * LCS device state machine + */ +enum lcs_dev_states { + DEV_STATE_DOWN, + DEV_STATE_UP, + DEV_STATE_RECOVER, +}; + +enum lcs_threads { + LCS_SET_MC_THREAD = 1, + LCS_RECOVERY_THREAD = 2, +}; + +/** + * LCS struct declarations + */ +struct lcs_header { + __u16 offset; + __u8 type; + __u8 slot; +} __attribute__ ((packed)); + +struct lcs_ip_mac_pair { + __be32 ip_addr; + __u8 mac_addr[LCS_MAC_LENGTH]; + __u8 reserved[2]; +} __attribute__ ((packed)); + +struct lcs_ipm_list { + struct list_head list; + struct lcs_ip_mac_pair ipm; + __u8 ipm_state; +}; + +struct lcs_cmd { + __u16 offset; + __u8 type; + __u8 slot; + __u8 cmd_code; + __u8 initiator; + __u16 sequence_no; + __u16 return_code; + union { + struct { + __u8 lan_type; + __u8 portno; + __u16 parameter_count; + __u8 operator_flags[3]; + __u8 reserved[3]; + } lcs_std_cmd; + struct { + __u16 unused1; + __u16 buff_size; + __u8 unused2[6]; + } lcs_startup; + struct { + __u8 lan_type; + __u8 portno; + __u8 unused[10]; + __u8 mac_addr[LCS_MAC_LENGTH]; + __u32 num_packets_deblocked; + __u32 num_packets_blocked; + __u32 num_packets_tx_on_lan; + __u32 num_tx_errors_detected; + __u32 num_tx_packets_disgarded; + __u32 num_packets_rx_from_lan; + __u32 num_rx_errors_detected; + __u32 num_rx_discarded_nobuffs_avail; + __u32 num_rx_packets_too_large; + } lcs_lanstat_cmd; +#ifdef CONFIG_IP_MULTICAST + struct { + __u8 lan_type; + __u8 portno; + __u16 num_ip_pairs; + __u16 ip_assists_supported; + __u16 ip_assists_enabled; + __u16 version; + struct { + struct lcs_ip_mac_pair + ip_mac_pair[32]; + __u32 response_data; + } lcs_ipass_ctlmsg __attribute ((packed)); + } lcs_qipassist __attribute__ ((packed)); +#endif /*CONFIG_IP_MULTICAST */ + } cmd __attribute__ ((packed)); +} __attribute__ ((packed)); + +/** + * Forward declarations. + */ +struct lcs_card; +struct lcs_channel; + +/** + * Definition of an lcs buffer. + */ +struct lcs_buffer { + enum lcs_buffer_states state; + void *data; + int count; + /* Callback for completion notification. */ + void (*callback)(struct lcs_channel *, struct lcs_buffer *); +}; + +struct lcs_reply { + struct list_head list; + __u16 sequence_no; + refcount_t refcnt; + /* Callback for completion notification. */ + void (*callback)(struct lcs_card *, struct lcs_cmd *); + wait_queue_head_t wait_q; + struct lcs_card *card; + struct timer_list timer; + int received; + int rc; +}; + +/** + * Definition of an lcs channel + */ +struct lcs_channel { + enum lcs_channel_states state; + struct ccw_device *ccwdev; + struct ccw1 ccws[LCS_NUM_BUFFS + 1]; + wait_queue_head_t wait_q; + struct tasklet_struct irq_tasklet; + struct lcs_buffer iob[LCS_NUM_BUFFS]; + int io_idx; + int buf_idx; +}; + + +/** + * definition of the lcs card + */ +struct lcs_card { + spinlock_t lock; + spinlock_t ipm_lock; + enum lcs_dev_states state; + struct net_device *dev; + struct net_device_stats stats; + __be16 (*lan_type_trans)(struct sk_buff *skb, + struct net_device *dev); + struct ccwgroup_device *gdev; + struct lcs_channel read; + struct lcs_channel write; + struct lcs_buffer *tx_buffer; + int tx_emitted; + struct list_head lancmd_waiters; + int lancmd_timeout; + + struct work_struct kernel_thread_starter; + spinlock_t mask_lock; + unsigned long thread_start_mask; + unsigned long thread_running_mask; + unsigned long thread_allowed_mask; + wait_queue_head_t wait_q; + +#ifdef CONFIG_IP_MULTICAST + struct list_head ipm_list; +#endif + __u8 mac[LCS_MAC_LENGTH]; + __u16 ip_assists_supported; + __u16 ip_assists_enabled; + __s8 lan_type; + __u32 pkt_seq; + __u16 sequence_no; + __s16 portno; + /* Some info copied from probeinfo */ + u8 device_forced; + u8 max_port_no; + u8 hint_port_no; + s16 port_protocol_no; +} __attribute__ ((aligned(8))); + diff --git a/drivers/s390/net/netiucv.c b/drivers/s390/net/netiucv.c new file mode 100644 index 000000000..5ce2424ca --- /dev/null +++ b/drivers/s390/net/netiucv.c @@ -0,0 +1,2216 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * IUCV network driver + * + * Copyright IBM Corp. 2001, 2009 + * + * Author(s): + * Original netiucv driver: + * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com) + * Sysfs integration and all bugs therein: + * Cornelia Huck (cornelia.huck@de.ibm.com) + * PM functions: + * Ursula Braun (ursula.braun@de.ibm.com) + * + * Documentation used: + * the source of the original IUCV driver by: + * Stefan Hegewald + * Hartmut Penner + * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) + * Martin Schwidefsky (schwidefsky@de.ibm.com) + * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000 + */ + +#define KMSG_COMPONENT "netiucv" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#undef DEBUG + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include "fsm.h" + +MODULE_AUTHOR + ("(C) 2001 IBM Corporation by Fritz Elfert (felfert@millenux.com)"); +MODULE_DESCRIPTION ("Linux for S/390 IUCV network driver"); + +/** + * Debug Facility stuff + */ +#define IUCV_DBF_SETUP_NAME "iucv_setup" +#define IUCV_DBF_SETUP_LEN 64 +#define IUCV_DBF_SETUP_PAGES 2 +#define IUCV_DBF_SETUP_NR_AREAS 1 +#define IUCV_DBF_SETUP_LEVEL 3 + +#define IUCV_DBF_DATA_NAME "iucv_data" +#define IUCV_DBF_DATA_LEN 128 +#define IUCV_DBF_DATA_PAGES 2 +#define IUCV_DBF_DATA_NR_AREAS 1 +#define IUCV_DBF_DATA_LEVEL 2 + +#define IUCV_DBF_TRACE_NAME "iucv_trace" +#define IUCV_DBF_TRACE_LEN 16 +#define IUCV_DBF_TRACE_PAGES 4 +#define IUCV_DBF_TRACE_NR_AREAS 1 +#define IUCV_DBF_TRACE_LEVEL 3 + +#define IUCV_DBF_TEXT(name,level,text) \ + do { \ + debug_text_event(iucv_dbf_##name,level,text); \ + } while (0) + +#define IUCV_DBF_HEX(name,level,addr,len) \ + do { \ + debug_event(iucv_dbf_##name,level,(void*)(addr),len); \ + } while (0) + +DECLARE_PER_CPU(char[256], iucv_dbf_txt_buf); + +#define IUCV_DBF_TEXT_(name, level, text...) \ + do { \ + if (debug_level_enabled(iucv_dbf_##name, level)) { \ + char* __buf = get_cpu_var(iucv_dbf_txt_buf); \ + sprintf(__buf, text); \ + debug_text_event(iucv_dbf_##name, level, __buf); \ + put_cpu_var(iucv_dbf_txt_buf); \ + } \ + } while (0) + +#define IUCV_DBF_SPRINTF(name,level,text...) \ + do { \ + debug_sprintf_event(iucv_dbf_trace, level, ##text ); \ + debug_sprintf_event(iucv_dbf_trace, level, text ); \ + } while (0) + +/** + * some more debug stuff + */ +#define PRINTK_HEADER " iucv: " /* for debugging */ + +/* dummy device to make sure netiucv_pm functions are called */ +static struct device *netiucv_dev; + +static int netiucv_pm_prepare(struct device *); +static void netiucv_pm_complete(struct device *); +static int netiucv_pm_freeze(struct device *); +static int netiucv_pm_restore_thaw(struct device *); + +static const struct dev_pm_ops netiucv_pm_ops = { + .prepare = netiucv_pm_prepare, + .complete = netiucv_pm_complete, + .freeze = netiucv_pm_freeze, + .thaw = netiucv_pm_restore_thaw, + .restore = netiucv_pm_restore_thaw, +}; + +static struct device_driver netiucv_driver = { + .owner = THIS_MODULE, + .name = "netiucv", + .bus = &iucv_bus, + .pm = &netiucv_pm_ops, +}; + +static int netiucv_callback_connreq(struct iucv_path *, u8 *, u8 *); +static void netiucv_callback_connack(struct iucv_path *, u8 *); +static void netiucv_callback_connrej(struct iucv_path *, u8 *); +static void netiucv_callback_connsusp(struct iucv_path *, u8 *); +static void netiucv_callback_connres(struct iucv_path *, u8 *); +static void netiucv_callback_rx(struct iucv_path *, struct iucv_message *); +static void netiucv_callback_txdone(struct iucv_path *, struct iucv_message *); + +static struct iucv_handler netiucv_handler = { + .path_pending = netiucv_callback_connreq, + .path_complete = netiucv_callback_connack, + .path_severed = netiucv_callback_connrej, + .path_quiesced = netiucv_callback_connsusp, + .path_resumed = netiucv_callback_connres, + .message_pending = netiucv_callback_rx, + .message_complete = netiucv_callback_txdone +}; + +/** + * Per connection profiling data + */ +struct connection_profile { + unsigned long maxmulti; + unsigned long maxcqueue; + unsigned long doios_single; + unsigned long doios_multi; + unsigned long txlen; + unsigned long tx_time; + unsigned long send_stamp; + unsigned long tx_pending; + unsigned long tx_max_pending; +}; + +/** + * Representation of one iucv connection + */ +struct iucv_connection { + struct list_head list; + struct iucv_path *path; + struct sk_buff *rx_buff; + struct sk_buff *tx_buff; + struct sk_buff_head collect_queue; + struct sk_buff_head commit_queue; + spinlock_t collect_lock; + int collect_len; + int max_buffsize; + fsm_timer timer; + fsm_instance *fsm; + struct net_device *netdev; + struct connection_profile prof; + char userid[9]; + char userdata[17]; +}; + +/** + * Linked list of all connection structs. + */ +static LIST_HEAD(iucv_connection_list); +static DEFINE_RWLOCK(iucv_connection_rwlock); + +/** + * Representation of event-data for the + * connection state machine. + */ +struct iucv_event { + struct iucv_connection *conn; + void *data; +}; + +/** + * Private part of the network device structure + */ +struct netiucv_priv { + struct net_device_stats stats; + unsigned long tbusy; + fsm_instance *fsm; + struct iucv_connection *conn; + struct device *dev; + int pm_state; +}; + +/** + * Link level header for a packet. + */ +struct ll_header { + u16 next; +}; + +#define NETIUCV_HDRLEN (sizeof(struct ll_header)) +#define NETIUCV_BUFSIZE_MAX 65537 +#define NETIUCV_BUFSIZE_DEFAULT NETIUCV_BUFSIZE_MAX +#define NETIUCV_MTU_MAX (NETIUCV_BUFSIZE_MAX - NETIUCV_HDRLEN) +#define NETIUCV_MTU_DEFAULT 9216 +#define NETIUCV_QUEUELEN_DEFAULT 50 +#define NETIUCV_TIMEOUT_5SEC 5000 + +/** + * Compatibility macros for busy handling + * of network devices. + */ +static void netiucv_clear_busy(struct net_device *dev) +{ + struct netiucv_priv *priv = netdev_priv(dev); + clear_bit(0, &priv->tbusy); + netif_wake_queue(dev); +} + +static int netiucv_test_and_set_busy(struct net_device *dev) +{ + struct netiucv_priv *priv = netdev_priv(dev); + netif_stop_queue(dev); + return test_and_set_bit(0, &priv->tbusy); +} + +static u8 iucvMagic_ascii[16] = { + 0x30, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, + 0x30, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20 +}; + +static u8 iucvMagic_ebcdic[16] = { + 0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, + 0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 +}; + +/** + * Convert an iucv userId to its printable + * form (strip whitespace at end). + * + * @param An iucv userId + * + * @returns The printable string (static data!!) + */ +static char *netiucv_printname(char *name, int len) +{ + static char tmp[17]; + char *p = tmp; + memcpy(tmp, name, len); + tmp[len] = '\0'; + while (*p && ((p - tmp) < len) && (!isspace(*p))) + p++; + *p = '\0'; + return tmp; +} + +static char *netiucv_printuser(struct iucv_connection *conn) +{ + static char tmp_uid[9]; + static char tmp_udat[17]; + static char buf[100]; + + if (memcmp(conn->userdata, iucvMagic_ebcdic, 16)) { + tmp_uid[8] = '\0'; + tmp_udat[16] = '\0'; + memcpy(tmp_uid, netiucv_printname(conn->userid, 8), 8); + memcpy(tmp_udat, conn->userdata, 16); + EBCASC(tmp_udat, 16); + memcpy(tmp_udat, netiucv_printname(tmp_udat, 16), 16); + sprintf(buf, "%s.%s", tmp_uid, tmp_udat); + return buf; + } else + return netiucv_printname(conn->userid, 8); +} + +/** + * States of the interface statemachine. + */ +enum dev_states { + DEV_STATE_STOPPED, + DEV_STATE_STARTWAIT, + DEV_STATE_STOPWAIT, + DEV_STATE_RUNNING, + /** + * MUST be always the last element!! + */ + NR_DEV_STATES +}; + +static const char *dev_state_names[] = { + "Stopped", + "StartWait", + "StopWait", + "Running", +}; + +/** + * Events of the interface statemachine. + */ +enum dev_events { + DEV_EVENT_START, + DEV_EVENT_STOP, + DEV_EVENT_CONUP, + DEV_EVENT_CONDOWN, + /** + * MUST be always the last element!! + */ + NR_DEV_EVENTS +}; + +static const char *dev_event_names[] = { + "Start", + "Stop", + "Connection up", + "Connection down", +}; + +/** + * Events of the connection statemachine + */ +enum conn_events { + /** + * Events, representing callbacks from + * lowlevel iucv layer) + */ + CONN_EVENT_CONN_REQ, + CONN_EVENT_CONN_ACK, + CONN_EVENT_CONN_REJ, + CONN_EVENT_CONN_SUS, + CONN_EVENT_CONN_RES, + CONN_EVENT_RX, + CONN_EVENT_TXDONE, + + /** + * Events, representing errors return codes from + * calls to lowlevel iucv layer + */ + + /** + * Event, representing timer expiry. + */ + CONN_EVENT_TIMER, + + /** + * Events, representing commands from upper levels. + */ + CONN_EVENT_START, + CONN_EVENT_STOP, + + /** + * MUST be always the last element!! + */ + NR_CONN_EVENTS, +}; + +static const char *conn_event_names[] = { + "Remote connection request", + "Remote connection acknowledge", + "Remote connection reject", + "Connection suspended", + "Connection resumed", + "Data received", + "Data sent", + + "Timer", + + "Start", + "Stop", +}; + +/** + * States of the connection statemachine. + */ +enum conn_states { + /** + * Connection not assigned to any device, + * initial state, invalid + */ + CONN_STATE_INVALID, + + /** + * Userid assigned but not operating + */ + CONN_STATE_STOPPED, + + /** + * Connection registered, + * no connection request sent yet, + * no connection request received + */ + CONN_STATE_STARTWAIT, + + /** + * Connection registered and connection request sent, + * no acknowledge and no connection request received yet. + */ + CONN_STATE_SETUPWAIT, + + /** + * Connection up and running idle + */ + CONN_STATE_IDLE, + + /** + * Data sent, awaiting CONN_EVENT_TXDONE + */ + CONN_STATE_TX, + + /** + * Error during registration. + */ + CONN_STATE_REGERR, + + /** + * Error during registration. + */ + CONN_STATE_CONNERR, + + /** + * MUST be always the last element!! + */ + NR_CONN_STATES, +}; + +static const char *conn_state_names[] = { + "Invalid", + "Stopped", + "StartWait", + "SetupWait", + "Idle", + "TX", + "Terminating", + "Registration error", + "Connect error", +}; + + +/** + * Debug Facility Stuff + */ +static debug_info_t *iucv_dbf_setup = NULL; +static debug_info_t *iucv_dbf_data = NULL; +static debug_info_t *iucv_dbf_trace = NULL; + +DEFINE_PER_CPU(char[256], iucv_dbf_txt_buf); + +static void iucv_unregister_dbf_views(void) +{ + debug_unregister(iucv_dbf_setup); + debug_unregister(iucv_dbf_data); + debug_unregister(iucv_dbf_trace); +} +static int iucv_register_dbf_views(void) +{ + iucv_dbf_setup = debug_register(IUCV_DBF_SETUP_NAME, + IUCV_DBF_SETUP_PAGES, + IUCV_DBF_SETUP_NR_AREAS, + IUCV_DBF_SETUP_LEN); + iucv_dbf_data = debug_register(IUCV_DBF_DATA_NAME, + IUCV_DBF_DATA_PAGES, + IUCV_DBF_DATA_NR_AREAS, + IUCV_DBF_DATA_LEN); + iucv_dbf_trace = debug_register(IUCV_DBF_TRACE_NAME, + IUCV_DBF_TRACE_PAGES, + IUCV_DBF_TRACE_NR_AREAS, + IUCV_DBF_TRACE_LEN); + + if ((iucv_dbf_setup == NULL) || (iucv_dbf_data == NULL) || + (iucv_dbf_trace == NULL)) { + iucv_unregister_dbf_views(); + return -ENOMEM; + } + debug_register_view(iucv_dbf_setup, &debug_hex_ascii_view); + debug_set_level(iucv_dbf_setup, IUCV_DBF_SETUP_LEVEL); + + debug_register_view(iucv_dbf_data, &debug_hex_ascii_view); + debug_set_level(iucv_dbf_data, IUCV_DBF_DATA_LEVEL); + + debug_register_view(iucv_dbf_trace, &debug_hex_ascii_view); + debug_set_level(iucv_dbf_trace, IUCV_DBF_TRACE_LEVEL); + + return 0; +} + +/* + * Callback-wrappers, called from lowlevel iucv layer. + */ + +static void netiucv_callback_rx(struct iucv_path *path, + struct iucv_message *msg) +{ + struct iucv_connection *conn = path->private; + struct iucv_event ev; + + ev.conn = conn; + ev.data = msg; + fsm_event(conn->fsm, CONN_EVENT_RX, &ev); +} + +static void netiucv_callback_txdone(struct iucv_path *path, + struct iucv_message *msg) +{ + struct iucv_connection *conn = path->private; + struct iucv_event ev; + + ev.conn = conn; + ev.data = msg; + fsm_event(conn->fsm, CONN_EVENT_TXDONE, &ev); +} + +static void netiucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) +{ + struct iucv_connection *conn = path->private; + + fsm_event(conn->fsm, CONN_EVENT_CONN_ACK, conn); +} + +static int netiucv_callback_connreq(struct iucv_path *path, u8 *ipvmid, + u8 *ipuser) +{ + struct iucv_connection *conn = path->private; + struct iucv_event ev; + static char tmp_user[9]; + static char tmp_udat[17]; + int rc; + + rc = -EINVAL; + memcpy(tmp_user, netiucv_printname(ipvmid, 8), 8); + memcpy(tmp_udat, ipuser, 16); + EBCASC(tmp_udat, 16); + read_lock_bh(&iucv_connection_rwlock); + list_for_each_entry(conn, &iucv_connection_list, list) { + if (strncmp(ipvmid, conn->userid, 8) || + strncmp(ipuser, conn->userdata, 16)) + continue; + /* Found a matching connection for this path. */ + conn->path = path; + ev.conn = conn; + ev.data = path; + fsm_event(conn->fsm, CONN_EVENT_CONN_REQ, &ev); + rc = 0; + } + IUCV_DBF_TEXT_(setup, 2, "Connection requested for %s.%s\n", + tmp_user, netiucv_printname(tmp_udat, 16)); + read_unlock_bh(&iucv_connection_rwlock); + return rc; +} + +static void netiucv_callback_connrej(struct iucv_path *path, u8 *ipuser) +{ + struct iucv_connection *conn = path->private; + + fsm_event(conn->fsm, CONN_EVENT_CONN_REJ, conn); +} + +static void netiucv_callback_connsusp(struct iucv_path *path, u8 *ipuser) +{ + struct iucv_connection *conn = path->private; + + fsm_event(conn->fsm, CONN_EVENT_CONN_SUS, conn); +} + +static void netiucv_callback_connres(struct iucv_path *path, u8 *ipuser) +{ + struct iucv_connection *conn = path->private; + + fsm_event(conn->fsm, CONN_EVENT_CONN_RES, conn); +} + +/** + * NOP action for statemachines + */ +static void netiucv_action_nop(fsm_instance *fi, int event, void *arg) +{ +} + +/* + * Actions of the connection statemachine + */ + +/** + * netiucv_unpack_skb + * @conn: The connection where this skb has been received. + * @pskb: The received skb. + * + * Unpack a just received skb and hand it over to upper layers. + * Helper function for conn_action_rx. + */ +static void netiucv_unpack_skb(struct iucv_connection *conn, + struct sk_buff *pskb) +{ + struct net_device *dev = conn->netdev; + struct netiucv_priv *privptr = netdev_priv(dev); + u16 offset = 0; + + skb_put(pskb, NETIUCV_HDRLEN); + pskb->dev = dev; + pskb->ip_summed = CHECKSUM_NONE; + pskb->protocol = cpu_to_be16(ETH_P_IP); + + while (1) { + struct sk_buff *skb; + struct ll_header *header = (struct ll_header *) pskb->data; + + if (!header->next) + break; + + skb_pull(pskb, NETIUCV_HDRLEN); + header->next -= offset; + offset += header->next; + header->next -= NETIUCV_HDRLEN; + if (skb_tailroom(pskb) < header->next) { + IUCV_DBF_TEXT_(data, 2, "Illegal next field: %d > %d\n", + header->next, skb_tailroom(pskb)); + return; + } + skb_put(pskb, header->next); + skb_reset_mac_header(pskb); + skb = dev_alloc_skb(pskb->len); + if (!skb) { + IUCV_DBF_TEXT(data, 2, + "Out of memory in netiucv_unpack_skb\n"); + privptr->stats.rx_dropped++; + return; + } + skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len), + pskb->len); + skb_reset_mac_header(skb); + skb->dev = pskb->dev; + skb->protocol = pskb->protocol; + pskb->ip_summed = CHECKSUM_UNNECESSARY; + privptr->stats.rx_packets++; + privptr->stats.rx_bytes += skb->len; + /* + * Since receiving is always initiated from a tasklet (in iucv.c), + * we must use netif_rx_ni() instead of netif_rx() + */ + netif_rx_ni(skb); + skb_pull(pskb, header->next); + skb_put(pskb, NETIUCV_HDRLEN); + } +} + +static void conn_action_rx(fsm_instance *fi, int event, void *arg) +{ + struct iucv_event *ev = arg; + struct iucv_connection *conn = ev->conn; + struct iucv_message *msg = ev->data; + struct netiucv_priv *privptr = netdev_priv(conn->netdev); + int rc; + + IUCV_DBF_TEXT(trace, 4, __func__); + + if (!conn->netdev) { + iucv_message_reject(conn->path, msg); + IUCV_DBF_TEXT(data, 2, + "Received data for unlinked connection\n"); + return; + } + if (msg->length > conn->max_buffsize) { + iucv_message_reject(conn->path, msg); + privptr->stats.rx_dropped++; + IUCV_DBF_TEXT_(data, 2, "msglen %d > max_buffsize %d\n", + msg->length, conn->max_buffsize); + return; + } + conn->rx_buff->data = conn->rx_buff->head; + skb_reset_tail_pointer(conn->rx_buff); + conn->rx_buff->len = 0; + rc = iucv_message_receive(conn->path, msg, 0, conn->rx_buff->data, + msg->length, NULL); + if (rc || msg->length < 5) { + privptr->stats.rx_errors++; + IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_receive\n", rc); + return; + } + netiucv_unpack_skb(conn, conn->rx_buff); +} + +static void conn_action_txdone(fsm_instance *fi, int event, void *arg) +{ + struct iucv_event *ev = arg; + struct iucv_connection *conn = ev->conn; + struct iucv_message *msg = ev->data; + struct iucv_message txmsg; + struct netiucv_priv *privptr = NULL; + u32 single_flag = msg->tag; + u32 txbytes = 0; + u32 txpackets = 0; + u32 stat_maxcq = 0; + struct sk_buff *skb; + unsigned long saveflags; + struct ll_header header; + int rc; + + IUCV_DBF_TEXT(trace, 4, __func__); + + if (!conn || !conn->netdev) { + IUCV_DBF_TEXT(data, 2, + "Send confirmation for unlinked connection\n"); + return; + } + privptr = netdev_priv(conn->netdev); + conn->prof.tx_pending--; + if (single_flag) { + if ((skb = skb_dequeue(&conn->commit_queue))) { + refcount_dec(&skb->users); + if (privptr) { + privptr->stats.tx_packets++; + privptr->stats.tx_bytes += + (skb->len - NETIUCV_HDRLEN + - NETIUCV_HDRLEN); + } + dev_kfree_skb_any(skb); + } + } + conn->tx_buff->data = conn->tx_buff->head; + skb_reset_tail_pointer(conn->tx_buff); + conn->tx_buff->len = 0; + spin_lock_irqsave(&conn->collect_lock, saveflags); + while ((skb = skb_dequeue(&conn->collect_queue))) { + header.next = conn->tx_buff->len + skb->len + NETIUCV_HDRLEN; + skb_put_data(conn->tx_buff, &header, NETIUCV_HDRLEN); + skb_copy_from_linear_data(skb, + skb_put(conn->tx_buff, skb->len), + skb->len); + txbytes += skb->len; + txpackets++; + stat_maxcq++; + refcount_dec(&skb->users); + dev_kfree_skb_any(skb); + } + if (conn->collect_len > conn->prof.maxmulti) + conn->prof.maxmulti = conn->collect_len; + conn->collect_len = 0; + spin_unlock_irqrestore(&conn->collect_lock, saveflags); + if (conn->tx_buff->len == 0) { + fsm_newstate(fi, CONN_STATE_IDLE); + return; + } + + header.next = 0; + skb_put_data(conn->tx_buff, &header, NETIUCV_HDRLEN); + conn->prof.send_stamp = jiffies; + txmsg.class = 0; + txmsg.tag = 0; + rc = iucv_message_send(conn->path, &txmsg, 0, 0, + conn->tx_buff->data, conn->tx_buff->len); + conn->prof.doios_multi++; + conn->prof.txlen += conn->tx_buff->len; + conn->prof.tx_pending++; + if (conn->prof.tx_pending > conn->prof.tx_max_pending) + conn->prof.tx_max_pending = conn->prof.tx_pending; + if (rc) { + conn->prof.tx_pending--; + fsm_newstate(fi, CONN_STATE_IDLE); + if (privptr) + privptr->stats.tx_errors += txpackets; + IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_send\n", rc); + } else { + if (privptr) { + privptr->stats.tx_packets += txpackets; + privptr->stats.tx_bytes += txbytes; + } + if (stat_maxcq > conn->prof.maxcqueue) + conn->prof.maxcqueue = stat_maxcq; + } +} + +static void conn_action_connaccept(fsm_instance *fi, int event, void *arg) +{ + struct iucv_event *ev = arg; + struct iucv_connection *conn = ev->conn; + struct iucv_path *path = ev->data; + struct net_device *netdev = conn->netdev; + struct netiucv_priv *privptr = netdev_priv(netdev); + int rc; + + IUCV_DBF_TEXT(trace, 3, __func__); + + conn->path = path; + path->msglim = NETIUCV_QUEUELEN_DEFAULT; + path->flags = 0; + rc = iucv_path_accept(path, &netiucv_handler, conn->userdata , conn); + if (rc) { + IUCV_DBF_TEXT_(setup, 2, "rc %d from iucv_accept", rc); + return; + } + fsm_newstate(fi, CONN_STATE_IDLE); + netdev->tx_queue_len = conn->path->msglim; + fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev); +} + +static void conn_action_connreject(fsm_instance *fi, int event, void *arg) +{ + struct iucv_event *ev = arg; + struct iucv_path *path = ev->data; + + IUCV_DBF_TEXT(trace, 3, __func__); + iucv_path_sever(path, NULL); +} + +static void conn_action_connack(fsm_instance *fi, int event, void *arg) +{ + struct iucv_connection *conn = arg; + struct net_device *netdev = conn->netdev; + struct netiucv_priv *privptr = netdev_priv(netdev); + + IUCV_DBF_TEXT(trace, 3, __func__); + fsm_deltimer(&conn->timer); + fsm_newstate(fi, CONN_STATE_IDLE); + netdev->tx_queue_len = conn->path->msglim; + fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev); +} + +static void conn_action_conntimsev(fsm_instance *fi, int event, void *arg) +{ + struct iucv_connection *conn = arg; + + IUCV_DBF_TEXT(trace, 3, __func__); + fsm_deltimer(&conn->timer); + iucv_path_sever(conn->path, conn->userdata); + fsm_newstate(fi, CONN_STATE_STARTWAIT); +} + +static void conn_action_connsever(fsm_instance *fi, int event, void *arg) +{ + struct iucv_connection *conn = arg; + struct net_device *netdev = conn->netdev; + struct netiucv_priv *privptr = netdev_priv(netdev); + + IUCV_DBF_TEXT(trace, 3, __func__); + + fsm_deltimer(&conn->timer); + iucv_path_sever(conn->path, conn->userdata); + dev_info(privptr->dev, "The peer z/VM guest %s has closed the " + "connection\n", netiucv_printuser(conn)); + IUCV_DBF_TEXT(data, 2, + "conn_action_connsever: Remote dropped connection\n"); + fsm_newstate(fi, CONN_STATE_STARTWAIT); + fsm_event(privptr->fsm, DEV_EVENT_CONDOWN, netdev); +} + +static void conn_action_start(fsm_instance *fi, int event, void *arg) +{ + struct iucv_connection *conn = arg; + struct net_device *netdev = conn->netdev; + struct netiucv_priv *privptr = netdev_priv(netdev); + int rc; + + IUCV_DBF_TEXT(trace, 3, __func__); + + fsm_newstate(fi, CONN_STATE_STARTWAIT); + + /* + * We must set the state before calling iucv_connect because the + * callback handler could be called at any point after the connection + * request is sent + */ + + fsm_newstate(fi, CONN_STATE_SETUPWAIT); + conn->path = iucv_path_alloc(NETIUCV_QUEUELEN_DEFAULT, 0, GFP_KERNEL); + IUCV_DBF_TEXT_(setup, 2, "%s: connecting to %s ...\n", + netdev->name, netiucv_printuser(conn)); + + rc = iucv_path_connect(conn->path, &netiucv_handler, conn->userid, + NULL, conn->userdata, conn); + switch (rc) { + case 0: + netdev->tx_queue_len = conn->path->msglim; + fsm_addtimer(&conn->timer, NETIUCV_TIMEOUT_5SEC, + CONN_EVENT_TIMER, conn); + return; + case 11: + dev_warn(privptr->dev, + "The IUCV device failed to connect to z/VM guest %s\n", + netiucv_printname(conn->userid, 8)); + fsm_newstate(fi, CONN_STATE_STARTWAIT); + break; + case 12: + dev_warn(privptr->dev, + "The IUCV device failed to connect to the peer on z/VM" + " guest %s\n", netiucv_printname(conn->userid, 8)); + fsm_newstate(fi, CONN_STATE_STARTWAIT); + break; + case 13: + dev_err(privptr->dev, + "Connecting the IUCV device would exceed the maximum" + " number of IUCV connections\n"); + fsm_newstate(fi, CONN_STATE_CONNERR); + break; + case 14: + dev_err(privptr->dev, + "z/VM guest %s has too many IUCV connections" + " to connect with the IUCV device\n", + netiucv_printname(conn->userid, 8)); + fsm_newstate(fi, CONN_STATE_CONNERR); + break; + case 15: + dev_err(privptr->dev, + "The IUCV device cannot connect to a z/VM guest with no" + " IUCV authorization\n"); + fsm_newstate(fi, CONN_STATE_CONNERR); + break; + default: + dev_err(privptr->dev, + "Connecting the IUCV device failed with error %d\n", + rc); + fsm_newstate(fi, CONN_STATE_CONNERR); + break; + } + IUCV_DBF_TEXT_(setup, 5, "iucv_connect rc is %d\n", rc); + kfree(conn->path); + conn->path = NULL; +} + +static void netiucv_purge_skb_queue(struct sk_buff_head *q) +{ + struct sk_buff *skb; + + while ((skb = skb_dequeue(q))) { + refcount_dec(&skb->users); + dev_kfree_skb_any(skb); + } +} + +static void conn_action_stop(fsm_instance *fi, int event, void *arg) +{ + struct iucv_event *ev = arg; + struct iucv_connection *conn = ev->conn; + struct net_device *netdev = conn->netdev; + struct netiucv_priv *privptr = netdev_priv(netdev); + + IUCV_DBF_TEXT(trace, 3, __func__); + + fsm_deltimer(&conn->timer); + fsm_newstate(fi, CONN_STATE_STOPPED); + netiucv_purge_skb_queue(&conn->collect_queue); + if (conn->path) { + IUCV_DBF_TEXT(trace, 5, "calling iucv_path_sever\n"); + iucv_path_sever(conn->path, conn->userdata); + kfree(conn->path); + conn->path = NULL; + } + netiucv_purge_skb_queue(&conn->commit_queue); + fsm_event(privptr->fsm, DEV_EVENT_CONDOWN, netdev); +} + +static void conn_action_inval(fsm_instance *fi, int event, void *arg) +{ + struct iucv_connection *conn = arg; + struct net_device *netdev = conn->netdev; + + IUCV_DBF_TEXT_(data, 2, "%s('%s'): conn_action_inval called\n", + netdev->name, conn->userid); +} + +static const fsm_node conn_fsm[] = { + { CONN_STATE_INVALID, CONN_EVENT_START, conn_action_inval }, + { CONN_STATE_STOPPED, CONN_EVENT_START, conn_action_start }, + + { CONN_STATE_STOPPED, CONN_EVENT_STOP, conn_action_stop }, + { CONN_STATE_STARTWAIT, CONN_EVENT_STOP, conn_action_stop }, + { CONN_STATE_SETUPWAIT, CONN_EVENT_STOP, conn_action_stop }, + { CONN_STATE_IDLE, CONN_EVENT_STOP, conn_action_stop }, + { CONN_STATE_TX, CONN_EVENT_STOP, conn_action_stop }, + { CONN_STATE_REGERR, CONN_EVENT_STOP, conn_action_stop }, + { CONN_STATE_CONNERR, CONN_EVENT_STOP, conn_action_stop }, + + { CONN_STATE_STOPPED, CONN_EVENT_CONN_REQ, conn_action_connreject }, + { CONN_STATE_STARTWAIT, CONN_EVENT_CONN_REQ, conn_action_connaccept }, + { CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_REQ, conn_action_connaccept }, + { CONN_STATE_IDLE, CONN_EVENT_CONN_REQ, conn_action_connreject }, + { CONN_STATE_TX, CONN_EVENT_CONN_REQ, conn_action_connreject }, + + { CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_ACK, conn_action_connack }, + { CONN_STATE_SETUPWAIT, CONN_EVENT_TIMER, conn_action_conntimsev }, + + { CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_REJ, conn_action_connsever }, + { CONN_STATE_IDLE, CONN_EVENT_CONN_REJ, conn_action_connsever }, + { CONN_STATE_TX, CONN_EVENT_CONN_REJ, conn_action_connsever }, + + { CONN_STATE_IDLE, CONN_EVENT_RX, conn_action_rx }, + { CONN_STATE_TX, CONN_EVENT_RX, conn_action_rx }, + + { CONN_STATE_TX, CONN_EVENT_TXDONE, conn_action_txdone }, + { CONN_STATE_IDLE, CONN_EVENT_TXDONE, conn_action_txdone }, +}; + +static const int CONN_FSM_LEN = sizeof(conn_fsm) / sizeof(fsm_node); + + +/* + * Actions for interface - statemachine. + */ + +/** + * dev_action_start + * @fi: An instance of an interface statemachine. + * @event: The event, just happened. + * @arg: Generic pointer, casted from struct net_device * upon call. + * + * Startup connection by sending CONN_EVENT_START to it. + */ +static void dev_action_start(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct netiucv_priv *privptr = netdev_priv(dev); + + IUCV_DBF_TEXT(trace, 3, __func__); + + fsm_newstate(fi, DEV_STATE_STARTWAIT); + fsm_event(privptr->conn->fsm, CONN_EVENT_START, privptr->conn); +} + +/** + * Shutdown connection by sending CONN_EVENT_STOP to it. + * + * @param fi An instance of an interface statemachine. + * @param event The event, just happened. + * @param arg Generic pointer, casted from struct net_device * upon call. + */ +static void +dev_action_stop(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct netiucv_priv *privptr = netdev_priv(dev); + struct iucv_event ev; + + IUCV_DBF_TEXT(trace, 3, __func__); + + ev.conn = privptr->conn; + + fsm_newstate(fi, DEV_STATE_STOPWAIT); + fsm_event(privptr->conn->fsm, CONN_EVENT_STOP, &ev); +} + +/** + * Called from connection statemachine + * when a connection is up and running. + * + * @param fi An instance of an interface statemachine. + * @param event The event, just happened. + * @param arg Generic pointer, casted from struct net_device * upon call. + */ +static void +dev_action_connup(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct netiucv_priv *privptr = netdev_priv(dev); + + IUCV_DBF_TEXT(trace, 3, __func__); + + switch (fsm_getstate(fi)) { + case DEV_STATE_STARTWAIT: + fsm_newstate(fi, DEV_STATE_RUNNING); + dev_info(privptr->dev, + "The IUCV device has been connected" + " successfully to %s\n", + netiucv_printuser(privptr->conn)); + IUCV_DBF_TEXT(setup, 3, + "connection is up and running\n"); + break; + case DEV_STATE_STOPWAIT: + IUCV_DBF_TEXT(data, 2, + "dev_action_connup: in DEV_STATE_STOPWAIT\n"); + break; + } +} + +/** + * Called from connection statemachine + * when a connection has been shutdown. + * + * @param fi An instance of an interface statemachine. + * @param event The event, just happened. + * @param arg Generic pointer, casted from struct net_device * upon call. + */ +static void +dev_action_conndown(fsm_instance *fi, int event, void *arg) +{ + IUCV_DBF_TEXT(trace, 3, __func__); + + switch (fsm_getstate(fi)) { + case DEV_STATE_RUNNING: + fsm_newstate(fi, DEV_STATE_STARTWAIT); + break; + case DEV_STATE_STOPWAIT: + fsm_newstate(fi, DEV_STATE_STOPPED); + IUCV_DBF_TEXT(setup, 3, "connection is down\n"); + break; + } +} + +static const fsm_node dev_fsm[] = { + { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start }, + + { DEV_STATE_STOPWAIT, DEV_EVENT_START, dev_action_start }, + { DEV_STATE_STOPWAIT, DEV_EVENT_CONDOWN, dev_action_conndown }, + + { DEV_STATE_STARTWAIT, DEV_EVENT_STOP, dev_action_stop }, + { DEV_STATE_STARTWAIT, DEV_EVENT_CONUP, dev_action_connup }, + + { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop }, + { DEV_STATE_RUNNING, DEV_EVENT_CONDOWN, dev_action_conndown }, + { DEV_STATE_RUNNING, DEV_EVENT_CONUP, netiucv_action_nop }, +}; + +static const int DEV_FSM_LEN = sizeof(dev_fsm) / sizeof(fsm_node); + +/** + * Transmit a packet. + * This is a helper function for netiucv_tx(). + * + * @param conn Connection to be used for sending. + * @param skb Pointer to struct sk_buff of packet to send. + * The linklevel header has already been set up + * by netiucv_tx(). + * + * @return 0 on success, -ERRNO on failure. (Never fails.) + */ +static int netiucv_transmit_skb(struct iucv_connection *conn, + struct sk_buff *skb) +{ + struct iucv_message msg; + unsigned long saveflags; + struct ll_header header; + int rc; + + if (fsm_getstate(conn->fsm) != CONN_STATE_IDLE) { + int l = skb->len + NETIUCV_HDRLEN; + + spin_lock_irqsave(&conn->collect_lock, saveflags); + if (conn->collect_len + l > + (conn->max_buffsize - NETIUCV_HDRLEN)) { + rc = -EBUSY; + IUCV_DBF_TEXT(data, 2, + "EBUSY from netiucv_transmit_skb\n"); + } else { + refcount_inc(&skb->users); + skb_queue_tail(&conn->collect_queue, skb); + conn->collect_len += l; + rc = 0; + } + spin_unlock_irqrestore(&conn->collect_lock, saveflags); + } else { + struct sk_buff *nskb = skb; + /** + * Copy the skb to a new allocated skb in lowmem only if the + * data is located above 2G in memory or tailroom is < 2. + */ + unsigned long hi = ((unsigned long)(skb_tail_pointer(skb) + + NETIUCV_HDRLEN)) >> 31; + int copied = 0; + if (hi || (skb_tailroom(skb) < 2)) { + nskb = alloc_skb(skb->len + NETIUCV_HDRLEN + + NETIUCV_HDRLEN, GFP_ATOMIC | GFP_DMA); + if (!nskb) { + IUCV_DBF_TEXT(data, 2, "alloc_skb failed\n"); + rc = -ENOMEM; + return rc; + } else { + skb_reserve(nskb, NETIUCV_HDRLEN); + skb_put_data(nskb, skb->data, skb->len); + } + copied = 1; + } + /** + * skb now is below 2G and has enough room. Add headers. + */ + header.next = nskb->len + NETIUCV_HDRLEN; + memcpy(skb_push(nskb, NETIUCV_HDRLEN), &header, NETIUCV_HDRLEN); + header.next = 0; + skb_put_data(nskb, &header, NETIUCV_HDRLEN); + + fsm_newstate(conn->fsm, CONN_STATE_TX); + conn->prof.send_stamp = jiffies; + + msg.tag = 1; + msg.class = 0; + rc = iucv_message_send(conn->path, &msg, 0, 0, + nskb->data, nskb->len); + conn->prof.doios_single++; + conn->prof.txlen += skb->len; + conn->prof.tx_pending++; + if (conn->prof.tx_pending > conn->prof.tx_max_pending) + conn->prof.tx_max_pending = conn->prof.tx_pending; + if (rc) { + struct netiucv_priv *privptr; + fsm_newstate(conn->fsm, CONN_STATE_IDLE); + conn->prof.tx_pending--; + privptr = netdev_priv(conn->netdev); + if (privptr) + privptr->stats.tx_errors++; + if (copied) + dev_kfree_skb(nskb); + else { + /** + * Remove our headers. They get added + * again on retransmit. + */ + skb_pull(skb, NETIUCV_HDRLEN); + skb_trim(skb, skb->len - NETIUCV_HDRLEN); + } + IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_send\n", rc); + } else { + if (copied) + dev_kfree_skb(skb); + refcount_inc(&nskb->users); + skb_queue_tail(&conn->commit_queue, nskb); + } + } + + return rc; +} + +/* + * Interface API for upper network layers + */ + +/** + * Open an interface. + * Called from generic network layer when ifconfig up is run. + * + * @param dev Pointer to interface struct. + * + * @return 0 on success, -ERRNO on failure. (Never fails.) + */ +static int netiucv_open(struct net_device *dev) +{ + struct netiucv_priv *priv = netdev_priv(dev); + + fsm_event(priv->fsm, DEV_EVENT_START, dev); + return 0; +} + +/** + * Close an interface. + * Called from generic network layer when ifconfig down is run. + * + * @param dev Pointer to interface struct. + * + * @return 0 on success, -ERRNO on failure. (Never fails.) + */ +static int netiucv_close(struct net_device *dev) +{ + struct netiucv_priv *priv = netdev_priv(dev); + + fsm_event(priv->fsm, DEV_EVENT_STOP, dev); + return 0; +} + +static int netiucv_pm_prepare(struct device *dev) +{ + IUCV_DBF_TEXT(trace, 3, __func__); + return 0; +} + +static void netiucv_pm_complete(struct device *dev) +{ + IUCV_DBF_TEXT(trace, 3, __func__); + return; +} + +/** + * netiucv_pm_freeze() - Freeze PM callback + * @dev: netiucv device + * + * close open netiucv interfaces + */ +static int netiucv_pm_freeze(struct device *dev) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + struct net_device *ndev = NULL; + int rc = 0; + + IUCV_DBF_TEXT(trace, 3, __func__); + if (priv && priv->conn) + ndev = priv->conn->netdev; + if (!ndev) + goto out; + netif_device_detach(ndev); + priv->pm_state = fsm_getstate(priv->fsm); + rc = netiucv_close(ndev); +out: + return rc; +} + +/** + * netiucv_pm_restore_thaw() - Thaw and restore PM callback + * @dev: netiucv device + * + * re-open netiucv interfaces closed during freeze + */ +static int netiucv_pm_restore_thaw(struct device *dev) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + struct net_device *ndev = NULL; + int rc = 0; + + IUCV_DBF_TEXT(trace, 3, __func__); + if (priv && priv->conn) + ndev = priv->conn->netdev; + if (!ndev) + goto out; + switch (priv->pm_state) { + case DEV_STATE_RUNNING: + case DEV_STATE_STARTWAIT: + rc = netiucv_open(ndev); + break; + default: + break; + } + netif_device_attach(ndev); +out: + return rc; +} + +/** + * Start transmission of a packet. + * Called from generic network device layer. + * + * @param skb Pointer to buffer containing the packet. + * @param dev Pointer to interface struct. + * + * @return 0 if packet consumed, !0 if packet rejected. + * Note: If we return !0, then the packet is free'd by + * the generic network layer. + */ +static int netiucv_tx(struct sk_buff *skb, struct net_device *dev) +{ + struct netiucv_priv *privptr = netdev_priv(dev); + int rc; + + IUCV_DBF_TEXT(trace, 4, __func__); + /** + * Some sanity checks ... + */ + if (skb == NULL) { + IUCV_DBF_TEXT(data, 2, "netiucv_tx: skb is NULL\n"); + privptr->stats.tx_dropped++; + return NETDEV_TX_OK; + } + if (skb_headroom(skb) < NETIUCV_HDRLEN) { + IUCV_DBF_TEXT(data, 2, + "netiucv_tx: skb_headroom < NETIUCV_HDRLEN\n"); + dev_kfree_skb(skb); + privptr->stats.tx_dropped++; + return NETDEV_TX_OK; + } + + /** + * If connection is not running, try to restart it + * and throw away packet. + */ + if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) { + dev_kfree_skb(skb); + privptr->stats.tx_dropped++; + privptr->stats.tx_errors++; + privptr->stats.tx_carrier_errors++; + return NETDEV_TX_OK; + } + + if (netiucv_test_and_set_busy(dev)) { + IUCV_DBF_TEXT(data, 2, "EBUSY from netiucv_tx\n"); + return NETDEV_TX_BUSY; + } + netif_trans_update(dev); + rc = netiucv_transmit_skb(privptr->conn, skb); + netiucv_clear_busy(dev); + return rc ? NETDEV_TX_BUSY : NETDEV_TX_OK; +} + +/** + * netiucv_stats + * @dev: Pointer to interface struct. + * + * Returns interface statistics of a device. + * + * Returns pointer to stats struct of this interface. + */ +static struct net_device_stats *netiucv_stats (struct net_device * dev) +{ + struct netiucv_priv *priv = netdev_priv(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return &priv->stats; +} + +/* + * attributes in sysfs + */ + +static ssize_t user_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%s\n", netiucv_printuser(priv->conn)); +} + +static int netiucv_check_user(const char *buf, size_t count, char *username, + char *userdata) +{ + const char *p; + int i; + + p = strchr(buf, '.'); + if ((p && ((count > 26) || + ((p - buf) > 8) || + (buf + count - p > 18))) || + (!p && (count > 9))) { + IUCV_DBF_TEXT(setup, 2, "conn_write: too long\n"); + return -EINVAL; + } + + for (i = 0, p = buf; i < 8 && *p && *p != '.'; i++, p++) { + if (isalnum(*p) || *p == '$') { + username[i] = toupper(*p); + continue; + } + if (*p == '\n') + /* trailing lf, grr */ + break; + IUCV_DBF_TEXT_(setup, 2, + "conn_write: invalid character %02x\n", *p); + return -EINVAL; + } + while (i < 8) + username[i++] = ' '; + username[8] = '\0'; + + if (*p == '.') { + p++; + for (i = 0; i < 16 && *p; i++, p++) { + if (*p == '\n') + break; + userdata[i] = toupper(*p); + } + while (i > 0 && i < 16) + userdata[i++] = ' '; + } else + memcpy(userdata, iucvMagic_ascii, 16); + userdata[16] = '\0'; + ASCEBC(userdata, 16); + + return 0; +} + +static ssize_t user_write(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + struct net_device *ndev = priv->conn->netdev; + char username[9]; + char userdata[17]; + int rc; + struct iucv_connection *cp; + + IUCV_DBF_TEXT(trace, 3, __func__); + rc = netiucv_check_user(buf, count, username, userdata); + if (rc) + return rc; + + if (memcmp(username, priv->conn->userid, 9) && + (ndev->flags & (IFF_UP | IFF_RUNNING))) { + /* username changed while the interface is active. */ + IUCV_DBF_TEXT(setup, 2, "user_write: device active\n"); + return -EPERM; + } + read_lock_bh(&iucv_connection_rwlock); + list_for_each_entry(cp, &iucv_connection_list, list) { + if (!strncmp(username, cp->userid, 9) && + !strncmp(userdata, cp->userdata, 17) && cp->netdev != ndev) { + read_unlock_bh(&iucv_connection_rwlock); + IUCV_DBF_TEXT_(setup, 2, "user_write: Connection to %s " + "already exists\n", netiucv_printuser(cp)); + return -EEXIST; + } + } + read_unlock_bh(&iucv_connection_rwlock); + memcpy(priv->conn->userid, username, 9); + memcpy(priv->conn->userdata, userdata, 17); + return count; +} + +static DEVICE_ATTR(user, 0644, user_show, user_write); + +static ssize_t buffer_show (struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%d\n", priv->conn->max_buffsize); +} + +static ssize_t buffer_write (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + struct net_device *ndev = priv->conn->netdev; + unsigned int bs1; + int rc; + + IUCV_DBF_TEXT(trace, 3, __func__); + if (count >= 39) + return -EINVAL; + + rc = kstrtouint(buf, 0, &bs1); + + if (rc == -EINVAL) { + IUCV_DBF_TEXT_(setup, 2, "buffer_write: invalid char %s\n", + buf); + return -EINVAL; + } + if ((rc == -ERANGE) || (bs1 > NETIUCV_BUFSIZE_MAX)) { + IUCV_DBF_TEXT_(setup, 2, + "buffer_write: buffer size %d too large\n", + bs1); + return -EINVAL; + } + if ((ndev->flags & IFF_RUNNING) && + (bs1 < (ndev->mtu + NETIUCV_HDRLEN + 2))) { + IUCV_DBF_TEXT_(setup, 2, + "buffer_write: buffer size %d too small\n", + bs1); + return -EINVAL; + } + if (bs1 < (576 + NETIUCV_HDRLEN + NETIUCV_HDRLEN)) { + IUCV_DBF_TEXT_(setup, 2, + "buffer_write: buffer size %d too small\n", + bs1); + return -EINVAL; + } + + priv->conn->max_buffsize = bs1; + if (!(ndev->flags & IFF_RUNNING)) + ndev->mtu = bs1 - NETIUCV_HDRLEN - NETIUCV_HDRLEN; + + return count; + +} + +static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write); + +static ssize_t dev_fsm_show (struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%s\n", fsm_getstate_str(priv->fsm)); +} + +static DEVICE_ATTR(device_fsm_state, 0444, dev_fsm_show, NULL); + +static ssize_t conn_fsm_show (struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%s\n", fsm_getstate_str(priv->conn->fsm)); +} + +static DEVICE_ATTR(connection_fsm_state, 0444, conn_fsm_show, NULL); + +static ssize_t maxmulti_show (struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%ld\n", priv->conn->prof.maxmulti); +} + +static ssize_t maxmulti_write (struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 4, __func__); + priv->conn->prof.maxmulti = 0; + return count; +} + +static DEVICE_ATTR(max_tx_buffer_used, 0644, maxmulti_show, maxmulti_write); + +static ssize_t maxcq_show (struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%ld\n", priv->conn->prof.maxcqueue); +} + +static ssize_t maxcq_write (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 4, __func__); + priv->conn->prof.maxcqueue = 0; + return count; +} + +static DEVICE_ATTR(max_chained_skbs, 0644, maxcq_show, maxcq_write); + +static ssize_t sdoio_show (struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%ld\n", priv->conn->prof.doios_single); +} + +static ssize_t sdoio_write (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 4, __func__); + priv->conn->prof.doios_single = 0; + return count; +} + +static DEVICE_ATTR(tx_single_write_ops, 0644, sdoio_show, sdoio_write); + +static ssize_t mdoio_show (struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%ld\n", priv->conn->prof.doios_multi); +} + +static ssize_t mdoio_write (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + priv->conn->prof.doios_multi = 0; + return count; +} + +static DEVICE_ATTR(tx_multi_write_ops, 0644, mdoio_show, mdoio_write); + +static ssize_t txlen_show (struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%ld\n", priv->conn->prof.txlen); +} + +static ssize_t txlen_write (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 4, __func__); + priv->conn->prof.txlen = 0; + return count; +} + +static DEVICE_ATTR(netto_bytes, 0644, txlen_show, txlen_write); + +static ssize_t txtime_show (struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%ld\n", priv->conn->prof.tx_time); +} + +static ssize_t txtime_write (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 4, __func__); + priv->conn->prof.tx_time = 0; + return count; +} + +static DEVICE_ATTR(max_tx_io_time, 0644, txtime_show, txtime_write); + +static ssize_t txpend_show (struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%ld\n", priv->conn->prof.tx_pending); +} + +static ssize_t txpend_write (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 4, __func__); + priv->conn->prof.tx_pending = 0; + return count; +} + +static DEVICE_ATTR(tx_pending, 0644, txpend_show, txpend_write); + +static ssize_t txmpnd_show (struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 5, __func__); + return sprintf(buf, "%ld\n", priv->conn->prof.tx_max_pending); +} + +static ssize_t txmpnd_write (struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct netiucv_priv *priv = dev_get_drvdata(dev); + + IUCV_DBF_TEXT(trace, 4, __func__); + priv->conn->prof.tx_max_pending = 0; + return count; +} + +static DEVICE_ATTR(tx_max_pending, 0644, txmpnd_show, txmpnd_write); + +static struct attribute *netiucv_attrs[] = { + &dev_attr_buffer.attr, + &dev_attr_user.attr, + NULL, +}; + +static struct attribute_group netiucv_attr_group = { + .attrs = netiucv_attrs, +}; + +static struct attribute *netiucv_stat_attrs[] = { + &dev_attr_device_fsm_state.attr, + &dev_attr_connection_fsm_state.attr, + &dev_attr_max_tx_buffer_used.attr, + &dev_attr_max_chained_skbs.attr, + &dev_attr_tx_single_write_ops.attr, + &dev_attr_tx_multi_write_ops.attr, + &dev_attr_netto_bytes.attr, + &dev_attr_max_tx_io_time.attr, + &dev_attr_tx_pending.attr, + &dev_attr_tx_max_pending.attr, + NULL, +}; + +static struct attribute_group netiucv_stat_attr_group = { + .name = "stats", + .attrs = netiucv_stat_attrs, +}; + +static const struct attribute_group *netiucv_attr_groups[] = { + &netiucv_stat_attr_group, + &netiucv_attr_group, + NULL, +}; + +static int netiucv_register_device(struct net_device *ndev) +{ + struct netiucv_priv *priv = netdev_priv(ndev); + struct device *dev = kzalloc(sizeof(struct device), GFP_KERNEL); + int ret; + + IUCV_DBF_TEXT(trace, 3, __func__); + + if (dev) { + dev_set_name(dev, "net%s", ndev->name); + dev->bus = &iucv_bus; + dev->parent = iucv_root; + dev->groups = netiucv_attr_groups; + /* + * The release function could be called after the + * module has been unloaded. It's _only_ task is to + * free the struct. Therefore, we specify kfree() + * directly here. (Probably a little bit obfuscating + * but legitime ...). + */ + dev->release = (void (*)(struct device *))kfree; + dev->driver = &netiucv_driver; + } else + return -ENOMEM; + + ret = device_register(dev); + if (ret) { + put_device(dev); + return ret; + } + priv->dev = dev; + dev_set_drvdata(dev, priv); + return 0; +} + +static void netiucv_unregister_device(struct device *dev) +{ + IUCV_DBF_TEXT(trace, 3, __func__); + device_unregister(dev); +} + +/** + * Allocate and initialize a new connection structure. + * Add it to the list of netiucv connections; + */ +static struct iucv_connection *netiucv_new_connection(struct net_device *dev, + char *username, + char *userdata) +{ + struct iucv_connection *conn; + + conn = kzalloc(sizeof(*conn), GFP_KERNEL); + if (!conn) + goto out; + skb_queue_head_init(&conn->collect_queue); + skb_queue_head_init(&conn->commit_queue); + spin_lock_init(&conn->collect_lock); + conn->max_buffsize = NETIUCV_BUFSIZE_DEFAULT; + conn->netdev = dev; + + conn->rx_buff = alloc_skb(conn->max_buffsize, GFP_KERNEL | GFP_DMA); + if (!conn->rx_buff) + goto out_conn; + conn->tx_buff = alloc_skb(conn->max_buffsize, GFP_KERNEL | GFP_DMA); + if (!conn->tx_buff) + goto out_rx; + conn->fsm = init_fsm("netiucvconn", conn_state_names, + conn_event_names, NR_CONN_STATES, + NR_CONN_EVENTS, conn_fsm, CONN_FSM_LEN, + GFP_KERNEL); + if (!conn->fsm) + goto out_tx; + + fsm_settimer(conn->fsm, &conn->timer); + fsm_newstate(conn->fsm, CONN_STATE_INVALID); + + if (userdata) + memcpy(conn->userdata, userdata, 17); + if (username) { + memcpy(conn->userid, username, 9); + fsm_newstate(conn->fsm, CONN_STATE_STOPPED); + } + + write_lock_bh(&iucv_connection_rwlock); + list_add_tail(&conn->list, &iucv_connection_list); + write_unlock_bh(&iucv_connection_rwlock); + return conn; + +out_tx: + kfree_skb(conn->tx_buff); +out_rx: + kfree_skb(conn->rx_buff); +out_conn: + kfree(conn); +out: + return NULL; +} + +/** + * Release a connection structure and remove it from the + * list of netiucv connections. + */ +static void netiucv_remove_connection(struct iucv_connection *conn) +{ + + IUCV_DBF_TEXT(trace, 3, __func__); + write_lock_bh(&iucv_connection_rwlock); + list_del_init(&conn->list); + write_unlock_bh(&iucv_connection_rwlock); + fsm_deltimer(&conn->timer); + netiucv_purge_skb_queue(&conn->collect_queue); + if (conn->path) { + iucv_path_sever(conn->path, conn->userdata); + kfree(conn->path); + conn->path = NULL; + } + netiucv_purge_skb_queue(&conn->commit_queue); + kfree_fsm(conn->fsm); + kfree_skb(conn->rx_buff); + kfree_skb(conn->tx_buff); +} + +/** + * Release everything of a net device. + */ +static void netiucv_free_netdevice(struct net_device *dev) +{ + struct netiucv_priv *privptr = netdev_priv(dev); + + IUCV_DBF_TEXT(trace, 3, __func__); + + if (!dev) + return; + + if (privptr) { + if (privptr->conn) + netiucv_remove_connection(privptr->conn); + if (privptr->fsm) + kfree_fsm(privptr->fsm); + privptr->conn = NULL; privptr->fsm = NULL; + /* privptr gets freed by free_netdev() */ + } +} + +/** + * Initialize a net device. (Called from kernel in alloc_netdev()) + */ +static const struct net_device_ops netiucv_netdev_ops = { + .ndo_open = netiucv_open, + .ndo_stop = netiucv_close, + .ndo_get_stats = netiucv_stats, + .ndo_start_xmit = netiucv_tx, +}; + +static void netiucv_setup_netdevice(struct net_device *dev) +{ + dev->mtu = NETIUCV_MTU_DEFAULT; + dev->min_mtu = 576; + dev->max_mtu = NETIUCV_MTU_MAX; + dev->needs_free_netdev = true; + dev->priv_destructor = netiucv_free_netdevice; + dev->hard_header_len = NETIUCV_HDRLEN; + dev->addr_len = 0; + dev->type = ARPHRD_SLIP; + dev->tx_queue_len = NETIUCV_QUEUELEN_DEFAULT; + dev->flags = IFF_POINTOPOINT | IFF_NOARP; + dev->netdev_ops = &netiucv_netdev_ops; +} + +/** + * Allocate and initialize everything of a net device. + */ +static struct net_device *netiucv_init_netdevice(char *username, char *userdata) +{ + struct netiucv_priv *privptr; + struct net_device *dev; + + dev = alloc_netdev(sizeof(struct netiucv_priv), "iucv%d", + NET_NAME_UNKNOWN, netiucv_setup_netdevice); + if (!dev) + return NULL; + rtnl_lock(); + if (dev_alloc_name(dev, dev->name) < 0) + goto out_netdev; + + privptr = netdev_priv(dev); + privptr->fsm = init_fsm("netiucvdev", dev_state_names, + dev_event_names, NR_DEV_STATES, NR_DEV_EVENTS, + dev_fsm, DEV_FSM_LEN, GFP_KERNEL); + if (!privptr->fsm) + goto out_netdev; + + privptr->conn = netiucv_new_connection(dev, username, userdata); + if (!privptr->conn) { + IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_new_connection\n"); + goto out_fsm; + } + fsm_newstate(privptr->fsm, DEV_STATE_STOPPED); + return dev; + +out_fsm: + kfree_fsm(privptr->fsm); +out_netdev: + rtnl_unlock(); + free_netdev(dev); + return NULL; +} + +static ssize_t connection_store(struct device_driver *drv, const char *buf, + size_t count) +{ + char username[9]; + char userdata[17]; + int rc; + struct net_device *dev; + struct netiucv_priv *priv; + struct iucv_connection *cp; + + IUCV_DBF_TEXT(trace, 3, __func__); + rc = netiucv_check_user(buf, count, username, userdata); + if (rc) + return rc; + + read_lock_bh(&iucv_connection_rwlock); + list_for_each_entry(cp, &iucv_connection_list, list) { + if (!strncmp(username, cp->userid, 9) && + !strncmp(userdata, cp->userdata, 17)) { + read_unlock_bh(&iucv_connection_rwlock); + IUCV_DBF_TEXT_(setup, 2, "conn_write: Connection to %s " + "already exists\n", netiucv_printuser(cp)); + return -EEXIST; + } + } + read_unlock_bh(&iucv_connection_rwlock); + + dev = netiucv_init_netdevice(username, userdata); + if (!dev) { + IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_init_netdevice\n"); + return -ENODEV; + } + + rc = netiucv_register_device(dev); + if (rc) { + rtnl_unlock(); + IUCV_DBF_TEXT_(setup, 2, + "ret %d from netiucv_register_device\n", rc); + goto out_free_ndev; + } + + /* sysfs magic */ + priv = netdev_priv(dev); + SET_NETDEV_DEV(dev, priv->dev); + + rc = register_netdevice(dev); + rtnl_unlock(); + if (rc) + goto out_unreg; + + dev_info(priv->dev, "The IUCV interface to %s has been established " + "successfully\n", + netiucv_printuser(priv->conn)); + + return count; + +out_unreg: + netiucv_unregister_device(priv->dev); +out_free_ndev: + netiucv_free_netdevice(dev); + return rc; +} +static DRIVER_ATTR_WO(connection); + +static ssize_t remove_store(struct device_driver *drv, const char *buf, + size_t count) +{ + struct iucv_connection *cp; + struct net_device *ndev; + struct netiucv_priv *priv; + struct device *dev; + char name[IFNAMSIZ]; + const char *p; + int i; + + IUCV_DBF_TEXT(trace, 3, __func__); + + if (count >= IFNAMSIZ) + count = IFNAMSIZ - 1; + + for (i = 0, p = buf; i < count && *p; i++, p++) { + if (*p == '\n' || *p == ' ') + /* trailing lf, grr */ + break; + name[i] = *p; + } + name[i] = '\0'; + + read_lock_bh(&iucv_connection_rwlock); + list_for_each_entry(cp, &iucv_connection_list, list) { + ndev = cp->netdev; + priv = netdev_priv(ndev); + dev = priv->dev; + if (strncmp(name, ndev->name, count)) + continue; + read_unlock_bh(&iucv_connection_rwlock); + if (ndev->flags & (IFF_UP | IFF_RUNNING)) { + dev_warn(dev, "The IUCV device is connected" + " to %s and cannot be removed\n", + priv->conn->userid); + IUCV_DBF_TEXT(data, 2, "remove_write: still active\n"); + return -EPERM; + } + unregister_netdev(ndev); + netiucv_unregister_device(dev); + return count; + } + read_unlock_bh(&iucv_connection_rwlock); + IUCV_DBF_TEXT(data, 2, "remove_write: unknown device\n"); + return -EINVAL; +} +static DRIVER_ATTR_WO(remove); + +static struct attribute * netiucv_drv_attrs[] = { + &driver_attr_connection.attr, + &driver_attr_remove.attr, + NULL, +}; + +static struct attribute_group netiucv_drv_attr_group = { + .attrs = netiucv_drv_attrs, +}; + +static const struct attribute_group *netiucv_drv_attr_groups[] = { + &netiucv_drv_attr_group, + NULL, +}; + +static void netiucv_banner(void) +{ + pr_info("driver initialized\n"); +} + +static void __exit netiucv_exit(void) +{ + struct iucv_connection *cp; + struct net_device *ndev; + struct netiucv_priv *priv; + struct device *dev; + + IUCV_DBF_TEXT(trace, 3, __func__); + while (!list_empty(&iucv_connection_list)) { + cp = list_entry(iucv_connection_list.next, + struct iucv_connection, list); + ndev = cp->netdev; + priv = netdev_priv(ndev); + dev = priv->dev; + + unregister_netdev(ndev); + netiucv_unregister_device(dev); + } + + device_unregister(netiucv_dev); + driver_unregister(&netiucv_driver); + iucv_unregister(&netiucv_handler, 1); + iucv_unregister_dbf_views(); + + pr_info("driver unloaded\n"); + return; +} + +static int __init netiucv_init(void) +{ + int rc; + + rc = iucv_register_dbf_views(); + if (rc) + goto out; + rc = iucv_register(&netiucv_handler, 1); + if (rc) + goto out_dbf; + IUCV_DBF_TEXT(trace, 3, __func__); + netiucv_driver.groups = netiucv_drv_attr_groups; + rc = driver_register(&netiucv_driver); + if (rc) { + IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_register\n", rc); + goto out_iucv; + } + /* establish dummy device */ + netiucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); + if (!netiucv_dev) { + rc = -ENOMEM; + goto out_driver; + } + dev_set_name(netiucv_dev, "netiucv"); + netiucv_dev->bus = &iucv_bus; + netiucv_dev->parent = iucv_root; + netiucv_dev->release = (void (*)(struct device *))kfree; + netiucv_dev->driver = &netiucv_driver; + rc = device_register(netiucv_dev); + if (rc) { + put_device(netiucv_dev); + goto out_driver; + } + netiucv_banner(); + return rc; + +out_driver: + driver_unregister(&netiucv_driver); +out_iucv: + iucv_unregister(&netiucv_handler, 1); +out_dbf: + iucv_unregister_dbf_views(); +out: + return rc; +} + +module_init(netiucv_init); +module_exit(netiucv_exit); +MODULE_LICENSE("GPL"); diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h new file mode 100644 index 000000000..b2657582c --- /dev/null +++ b/drivers/s390/net/qeth_core.h @@ -0,0 +1,1073 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2007 + * Author(s): Utz Bacher , + * Frank Pavlic , + * Thomas Spatzier , + * Frank Blaschka + */ + +#ifndef __QETH_CORE_H__ +#define __QETH_CORE_H__ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "qeth_core_mpc.h" + +/** + * Debug Facility stuff + */ +enum qeth_dbf_names { + QETH_DBF_SETUP, + QETH_DBF_MSG, + QETH_DBF_CTRL, + QETH_DBF_INFOS /* must be last element */ +}; + +struct qeth_dbf_info { + char name[DEBUG_MAX_NAME_LEN]; + int pages; + int areas; + int len; + int level; + struct debug_view *view; + debug_info_t *id; +}; + +#define QETH_DBF_CTRL_LEN 256 + +#define QETH_DBF_TEXT(name, level, text) \ + debug_text_event(qeth_dbf[QETH_DBF_##name].id, level, text) + +#define QETH_DBF_HEX(name, level, addr, len) \ + debug_event(qeth_dbf[QETH_DBF_##name].id, level, (void *)(addr), len) + +#define QETH_DBF_MESSAGE(level, text...) \ + debug_sprintf_event(qeth_dbf[QETH_DBF_MSG].id, level, text) + +#define QETH_DBF_TEXT_(name, level, text...) \ + qeth_dbf_longtext(qeth_dbf[QETH_DBF_##name].id, level, text) + +#define QETH_CARD_TEXT(card, level, text) \ + debug_text_event(card->debug, level, text) + +#define QETH_CARD_HEX(card, level, addr, len) \ + debug_event(card->debug, level, (void *)(addr), len) + +#define QETH_CARD_MESSAGE(card, text...) \ + debug_sprintf_event(card->debug, level, text) + +#define QETH_CARD_TEXT_(card, level, text...) \ + qeth_dbf_longtext(card->debug, level, text) + +#define SENSE_COMMAND_REJECT_BYTE 0 +#define SENSE_COMMAND_REJECT_FLAG 0x80 +#define SENSE_RESETTING_EVENT_BYTE 1 +#define SENSE_RESETTING_EVENT_FLAG 0x80 + +/* + * Common IO related definitions + */ +#define CARD_RDEV(card) card->read.ccwdev +#define CARD_WDEV(card) card->write.ccwdev +#define CARD_DDEV(card) card->data.ccwdev +#define CARD_BUS_ID(card) dev_name(&card->gdev->dev) +#define CARD_RDEV_ID(card) dev_name(&card->read.ccwdev->dev) +#define CARD_WDEV_ID(card) dev_name(&card->write.ccwdev->dev) +#define CARD_DDEV_ID(card) dev_name(&card->data.ccwdev->dev) +#define CHANNEL_ID(channel) dev_name(&channel->ccwdev->dev) + +/** + * card stuff + */ +struct qeth_perf_stats { + unsigned int bufs_rec; + unsigned int bufs_sent; + unsigned int buf_elements_sent; + + unsigned int skbs_sent_pack; + unsigned int bufs_sent_pack; + + unsigned int sc_dp_p; + unsigned int sc_p_dp; + /* qdio_cq_handler: number of times called, time spent in */ + __u64 cq_start_time; + unsigned int cq_cnt; + unsigned int cq_time; + /* qdio_input_handler: number of times called, time spent in */ + __u64 inbound_start_time; + unsigned int inbound_cnt; + unsigned int inbound_time; + /* qeth_send_packet: number of times called, time spent in */ + __u64 outbound_start_time; + unsigned int outbound_cnt; + unsigned int outbound_time; + /* qdio_output_handler: number of times called, time spent in */ + __u64 outbound_handler_start_time; + unsigned int outbound_handler_cnt; + unsigned int outbound_handler_time; + /* number of calls to and time spent in do_QDIO for inbound queue */ + __u64 inbound_do_qdio_start_time; + unsigned int inbound_do_qdio_cnt; + unsigned int inbound_do_qdio_time; + /* number of calls to and time spent in do_QDIO for outbound queues */ + __u64 outbound_do_qdio_start_time; + unsigned int outbound_do_qdio_cnt; + unsigned int outbound_do_qdio_time; + unsigned int large_send_bytes; + unsigned int large_send_cnt; + unsigned int sg_skbs_sent; + /* initial values when measuring starts */ + unsigned long initial_rx_packets; + unsigned long initial_tx_packets; + /* inbound scatter gather data */ + unsigned int sg_skbs_rx; + unsigned int sg_frags_rx; + unsigned int sg_alloc_page_rx; + unsigned int tx_csum; + unsigned int tx_lin; + unsigned int tx_linfail; + unsigned int rx_csum; +}; + +/* Routing stuff */ +struct qeth_routing_info { + enum qeth_routing_types type; +}; + +/* IPA stuff */ +struct qeth_ipa_info { + __u32 supported_funcs; + __u32 enabled_funcs; +}; + +/* SETBRIDGEPORT stuff */ +enum qeth_sbp_roles { + QETH_SBP_ROLE_NONE = 0, + QETH_SBP_ROLE_PRIMARY = 1, + QETH_SBP_ROLE_SECONDARY = 2, +}; + +enum qeth_sbp_states { + QETH_SBP_STATE_INACTIVE = 0, + QETH_SBP_STATE_STANDBY = 1, + QETH_SBP_STATE_ACTIVE = 2, +}; + +#define QETH_SBP_HOST_NOTIFICATION 1 + +struct qeth_sbp_info { + __u32 supported_funcs; + enum qeth_sbp_roles role; + __u32 hostnotification:1; + __u32 reflect_promisc:1; + __u32 reflect_promisc_primary:1; +}; + +struct qeth_vnicc_info { + /* supported/currently configured VNICCs; updated in IPA exchanges */ + u32 sup_chars; + u32 cur_chars; + /* supported commands: bitmasks which VNICCs support respective cmd */ + u32 set_char_sup; + u32 getset_timeout_sup; + /* timeout value for the learning characteristic */ + u32 learning_timeout; + /* characteristics wanted/configured by user */ + u32 wanted_chars; + /* has user explicitly enabled rx_bcast while online? */ + bool rx_bcast_enabled; +}; + +static inline int qeth_is_adp_supported(struct qeth_ipa_info *ipa, + enum qeth_ipa_setadp_cmd func) +{ + return (ipa->supported_funcs & func); +} + +static inline int qeth_is_ipa_supported(struct qeth_ipa_info *ipa, + enum qeth_ipa_funcs func) +{ + return (ipa->supported_funcs & func); +} + +static inline int qeth_is_ipa_enabled(struct qeth_ipa_info *ipa, + enum qeth_ipa_funcs func) +{ + return (ipa->supported_funcs & ipa->enabled_funcs & func); +} + +#define qeth_adp_supported(c, f) \ + qeth_is_adp_supported(&c->options.adp, f) +#define qeth_is_supported(c, f) \ + qeth_is_ipa_supported(&c->options.ipa4, f) +#define qeth_is_enabled(c, f) \ + qeth_is_ipa_enabled(&c->options.ipa4, f) +#define qeth_is_supported6(c, f) \ + qeth_is_ipa_supported(&c->options.ipa6, f) +#define qeth_is_enabled6(c, f) \ + qeth_is_ipa_enabled(&c->options.ipa6, f) +#define qeth_is_ipafunc_supported(c, prot, f) \ + ((prot == QETH_PROT_IPV6) ? \ + qeth_is_supported6(c, f) : qeth_is_supported(c, f)) +#define qeth_is_ipafunc_enabled(c, prot, f) \ + ((prot == QETH_PROT_IPV6) ? \ + qeth_is_enabled6(c, f) : qeth_is_enabled(c, f)) + +#define QETH_IDX_FUNC_LEVEL_OSD 0x0101 +#define QETH_IDX_FUNC_LEVEL_IQD 0x4108 + +#define QETH_BUFSIZE 4096 +#define CCW_CMD_WRITE 0x01 +#define CCW_CMD_READ 0x02 + +/** + * some more defs + */ +#define QETH_TX_TIMEOUT 100 * HZ +#define QETH_RCD_TIMEOUT 60 * HZ +#define QETH_RECLAIM_WORK_TIME HZ +#define QETH_MAX_PORTNO 15 + +/*IPv6 address autoconfiguration stuff*/ +#define UNIQUE_ID_IF_CREATE_ADDR_FAILED 0xfffe +#define UNIQUE_ID_NOT_BY_CARD 0x10000 + +/*****************************************************************************/ +/* QDIO queue and buffer handling */ +/*****************************************************************************/ +#define QETH_MAX_QUEUES 4 +#define QETH_IN_BUF_SIZE_DEFAULT 65536 +#define QETH_IN_BUF_COUNT_DEFAULT 64 +#define QETH_IN_BUF_COUNT_HSDEFAULT 128 +#define QETH_IN_BUF_COUNT_MIN 8 +#define QETH_IN_BUF_COUNT_MAX 128 +#define QETH_MAX_BUFFER_ELEMENTS(card) ((card)->qdio.in_buf_size >> 12) +#define QETH_IN_BUF_REQUEUE_THRESHOLD(card) \ + ((card)->qdio.in_buf_pool.buf_count / 2) + +/* buffers we have to be behind before we get a PCI */ +#define QETH_PCI_THRESHOLD_A(card) ((card)->qdio.in_buf_pool.buf_count+1) +/*enqueued free buffers left before we get a PCI*/ +#define QETH_PCI_THRESHOLD_B(card) 0 +/*not used unless the microcode gets patched*/ +#define QETH_PCI_TIMER_VALUE(card) 3 + +/* priority queing */ +#define QETH_PRIOQ_DEFAULT QETH_NO_PRIO_QUEUEING +#define QETH_DEFAULT_QUEUE 2 +#define QETH_NO_PRIO_QUEUEING 0 +#define QETH_PRIO_Q_ING_PREC 1 +#define QETH_PRIO_Q_ING_TOS 2 +#define QETH_PRIO_Q_ING_SKB 3 +#define QETH_PRIO_Q_ING_VLAN 4 + +/* Packing */ +#define QETH_LOW_WATERMARK_PACK 2 +#define QETH_HIGH_WATERMARK_PACK 5 +#define QETH_WATERMARK_PACK_FUZZ 1 + +/* large receive scatter gather copy break */ +#define QETH_RX_SG_CB (PAGE_SIZE >> 1) +#define QETH_RX_PULL_LEN 256 + +struct qeth_hdr_layer3 { + __u8 id; + __u8 flags; + __u16 inbound_checksum; /*TSO:__u16 seqno */ + __u32 token; /*TSO: __u32 reserved */ + __u16 length; + __u8 vlan_prio; + __u8 ext_flags; + __u16 vlan_id; + __u16 frame_offset; + union { + /* TX: */ + u8 ipv6_addr[16]; + struct ipv4 { + u8 res[12]; + u32 addr; + } ipv4; + /* RX: */ + struct rx { + u8 res1[2]; + u8 src_mac[6]; + u8 res2[4]; + u16 vlan_id; + u8 res3[2]; + } rx; + } next_hop; +}; + +struct qeth_hdr_layer2 { + __u8 id; + __u8 flags[3]; + __u8 port_no; + __u8 hdr_length; + __u16 pkt_length; + __u16 seq_no; + __u16 vlan_id; + __u32 reserved; + __u8 reserved2[16]; +} __attribute__ ((packed)); + +struct qeth_hdr_osn { + __u8 id; + __u8 reserved; + __u16 seq_no; + __u16 reserved2; + __u16 control_flags; + __u16 pdu_length; + __u8 reserved3[18]; + __u32 ccid; +} __attribute__ ((packed)); + +struct qeth_hdr { + union { + struct qeth_hdr_layer2 l2; + struct qeth_hdr_layer3 l3; + struct qeth_hdr_osn osn; + } hdr; +} __attribute__ ((packed)); + +/*TCP Segmentation Offload header*/ +struct qeth_hdr_ext_tso { + __u16 hdr_tot_len; + __u8 imb_hdr_no; + __u8 reserved; + __u8 hdr_type; + __u8 hdr_version; + __u16 hdr_len; + __u32 payload_len; + __u16 mss; + __u16 dg_hdr_len; + __u8 padding[16]; +} __attribute__ ((packed)); + +struct qeth_hdr_tso { + struct qeth_hdr hdr; /*hdr->hdr.l3.xxx*/ + struct qeth_hdr_ext_tso ext; +} __attribute__ ((packed)); + + +/* flags for qeth_hdr.flags */ +#define QETH_HDR_PASSTHRU 0x10 +#define QETH_HDR_IPV6 0x80 +#define QETH_HDR_CAST_MASK 0x07 +enum qeth_cast_flags { + QETH_CAST_UNICAST = 0x06, + QETH_CAST_MULTICAST = 0x04, + QETH_CAST_BROADCAST = 0x05, + QETH_CAST_ANYCAST = 0x07, + QETH_CAST_NOCAST = 0x00, +}; + +enum qeth_layer2_frame_flags { + QETH_LAYER2_FLAG_MULTICAST = 0x01, + QETH_LAYER2_FLAG_BROADCAST = 0x02, + QETH_LAYER2_FLAG_UNICAST = 0x04, + QETH_LAYER2_FLAG_VLAN = 0x10, +}; + +enum qeth_header_ids { + QETH_HEADER_TYPE_LAYER3 = 0x01, + QETH_HEADER_TYPE_LAYER2 = 0x02, + QETH_HEADER_TYPE_TSO = 0x03, + QETH_HEADER_TYPE_OSN = 0x04, +}; +/* flags for qeth_hdr.ext_flags */ +#define QETH_HDR_EXT_VLAN_FRAME 0x01 +#define QETH_HDR_EXT_TOKEN_ID 0x02 +#define QETH_HDR_EXT_INCLUDE_VLAN_TAG 0x04 +#define QETH_HDR_EXT_SRC_MAC_ADDR 0x08 +#define QETH_HDR_EXT_CSUM_HDR_REQ 0x10 +#define QETH_HDR_EXT_CSUM_TRANSP_REQ 0x20 +#define QETH_HDR_EXT_UDP 0x40 /*bit off for TCP*/ + +enum qeth_qdio_buffer_states { + /* + * inbound: read out by driver; owned by hardware in order to be filled + * outbound: owned by driver in order to be filled + */ + QETH_QDIO_BUF_EMPTY, + /* + * inbound: filled by hardware; owned by driver in order to be read out + * outbound: filled by driver; owned by hardware in order to be sent + */ + QETH_QDIO_BUF_PRIMED, + /* + * inbound: not applicable + * outbound: identified to be pending in TPQ + */ + QETH_QDIO_BUF_PENDING, + /* + * inbound: not applicable + * outbound: found in completion queue + */ + QETH_QDIO_BUF_IN_CQ, + /* + * inbound: not applicable + * outbound: handled via transfer pending / completion queue + */ + QETH_QDIO_BUF_HANDLED_DELAYED, +}; + +enum qeth_qdio_info_states { + QETH_QDIO_UNINITIALIZED, + QETH_QDIO_ALLOCATED, + QETH_QDIO_ESTABLISHED, + QETH_QDIO_CLEANING +}; + +struct qeth_buffer_pool_entry { + struct list_head list; + struct list_head init_list; + void *elements[QDIO_MAX_ELEMENTS_PER_BUFFER]; +}; + +struct qeth_qdio_buffer_pool { + struct list_head entry_list; + int buf_count; +}; + +struct qeth_qdio_buffer { + struct qdio_buffer *buffer; + /* the buffer pool entry currently associated to this buffer */ + struct qeth_buffer_pool_entry *pool_entry; + struct sk_buff *rx_skb; +}; + +struct qeth_qdio_q { + struct qdio_buffer *qdio_bufs[QDIO_MAX_BUFFERS_PER_Q]; + struct qeth_qdio_buffer bufs[QDIO_MAX_BUFFERS_PER_Q]; + int next_buf_to_init; +}; + +struct qeth_qdio_out_buffer { + struct qdio_buffer *buffer; + atomic_t state; + int next_element_to_fill; + struct sk_buff_head skb_list; + int is_header[QDIO_MAX_ELEMENTS_PER_BUFFER]; + + struct qeth_qdio_out_q *q; + struct qeth_qdio_out_buffer *next_pending; +}; + +struct qeth_card; + +enum qeth_out_q_states { + QETH_OUT_Q_UNLOCKED, + QETH_OUT_Q_LOCKED, + QETH_OUT_Q_LOCKED_FLUSH, +}; + +struct qeth_qdio_out_q { + struct qdio_buffer *qdio_bufs[QDIO_MAX_BUFFERS_PER_Q]; + struct qeth_qdio_out_buffer *bufs[QDIO_MAX_BUFFERS_PER_Q]; + struct qdio_outbuf_state *bufstates; /* convenience pointer */ + int queue_no; + struct qeth_card *card; + atomic_t state; + int do_pack; + /* + * index of buffer to be filled by driver; state EMPTY or PACKING + */ + int next_buf_to_fill; + /* + * number of buffers that are currently filled (PRIMED) + * -> these buffers are hardware-owned + */ + atomic_t used_buffers; + /* indicates whether PCI flag must be set (or if one is outstanding) */ + atomic_t set_pci_flags_count; +}; + +struct qeth_qdio_info { + atomic_t state; + /* input */ + int no_in_queues; + struct qeth_qdio_q *in_q; + struct qeth_qdio_q *c_q; + struct qeth_qdio_buffer_pool in_buf_pool; + struct qeth_qdio_buffer_pool init_pool; + int in_buf_size; + + /* output */ + int no_out_queues; + struct qeth_qdio_out_q **out_qs; + struct qdio_outbuf_state *out_bufstates; + + /* priority queueing */ + int do_prio_queueing; + int default_out_queue; +}; + +/** + * buffer stuff for read channel + */ +#define QETH_CMD_BUFFER_NO 8 + +/** + * channel state machine + */ +enum qeth_channel_states { + CH_STATE_UP, + CH_STATE_DOWN, + CH_STATE_ACTIVATING, + CH_STATE_HALTED, + CH_STATE_STOPPED, + CH_STATE_RCD, + CH_STATE_RCD_DONE, +}; +/** + * card state machine + */ +enum qeth_card_states { + CARD_STATE_DOWN, + CARD_STATE_HARDSETUP, + CARD_STATE_SOFTSETUP, + CARD_STATE_UP, + CARD_STATE_RECOVER, +}; + +/** + * Protocol versions + */ +enum qeth_prot_versions { + QETH_PROT_IPV4 = 0x0004, + QETH_PROT_IPV6 = 0x0006, +}; + +enum qeth_cmd_buffer_state { + BUF_STATE_FREE, + BUF_STATE_LOCKED, +}; + +enum qeth_cq { + QETH_CQ_DISABLED = 0, + QETH_CQ_ENABLED = 1, + QETH_CQ_NOTAVAILABLE = 2, +}; + +struct qeth_ipato { + bool enabled; + bool invert4; + bool invert6; + struct list_head entries; +}; + +struct qeth_channel; + +struct qeth_cmd_buffer { + enum qeth_cmd_buffer_state state; + struct qeth_channel *channel; + unsigned char *data; + int rc; + void (*callback) (struct qeth_channel *, struct qeth_cmd_buffer *); +}; + +static inline struct qeth_ipa_cmd *__ipa_cmd(struct qeth_cmd_buffer *iob) +{ + return (struct qeth_ipa_cmd *)(iob->data + IPA_PDU_HEADER_SIZE); +} + +/** + * definition of a qeth channel, used for read and write + */ +struct qeth_channel { + enum qeth_channel_states state; + struct ccw1 *ccw; + spinlock_t iob_lock; + wait_queue_head_t wait_q; + struct ccw_device *ccwdev; +/*command buffer for control data*/ + struct qeth_cmd_buffer iob[QETH_CMD_BUFFER_NO]; + atomic_t irq_pending; + int io_buf_no; +}; + +/** + * OSA card related definitions + */ +struct qeth_token { + __u32 issuer_rm_w; + __u32 issuer_rm_r; + __u32 cm_filter_w; + __u32 cm_filter_r; + __u32 cm_connection_w; + __u32 cm_connection_r; + __u32 ulp_filter_w; + __u32 ulp_filter_r; + __u32 ulp_connection_w; + __u32 ulp_connection_r; +}; + +struct qeth_seqno { + __u32 trans_hdr; + __u32 pdu_hdr; + __u32 pdu_hdr_ack; + __u16 ipa; + __u32 pkt_seqno; +}; + +struct qeth_reply { + struct list_head list; + wait_queue_head_t wait_q; + int (*callback)(struct qeth_card *, struct qeth_reply *, + unsigned long); + u32 seqno; + unsigned long offset; + atomic_t received; + int rc; + void *param; + struct qeth_card *card; + refcount_t refcnt; +}; + +struct qeth_card_blkt { + int time_total; + int inter_packet; + int inter_packet_jumbo; +}; + +#define QETH_BROADCAST_WITH_ECHO 0x01 +#define QETH_BROADCAST_WITHOUT_ECHO 0x02 +#define QETH_LAYER2_MAC_READ 0x01 +#define QETH_LAYER2_MAC_REGISTERED 0x02 +struct qeth_card_info { + unsigned short unit_addr2; + unsigned short cula; + unsigned short chpid; + __u16 func_level; + char mcl_level[QETH_MCL_LENGTH + 1]; + int guestlan; + int mac_bits; + enum qeth_card_types type; + enum qeth_link_types link_type; + int broadcast_capable; + int unique_id; + bool layer_enforced; + struct qeth_card_blkt blkt; + enum qeth_ipa_promisc_modes promisc_mode; + __u32 diagass_support; + __u32 hwtrap; +}; + +struct qeth_card_options { + struct qeth_routing_info route4; + struct qeth_ipa_info ipa4; + struct qeth_ipa_info adp; /*Adapter parameters*/ + struct qeth_routing_info route6; + struct qeth_ipa_info ipa6; + struct qeth_sbp_info sbp; /* SETBRIDGEPORT options */ + struct qeth_vnicc_info vnicc; /* VNICC options */ + int fake_broadcast; + int layer2; + int performance_stats; + int rx_sg_cb; + enum qeth_ipa_isolation_modes isolation; + enum qeth_ipa_isolation_modes prev_isolation; + int sniffer; + enum qeth_cq cq; + char hsuid[9]; +}; + +/* + * thread bits for qeth_card thread masks + */ +enum qeth_threads { + QETH_RECOVER_THREAD = 1, +}; + +struct qeth_osn_info { + int (*assist_cb)(struct net_device *dev, void *data); + int (*data_cb)(struct sk_buff *skb); +}; + +enum qeth_discipline_id { + QETH_DISCIPLINE_UNDETERMINED = -1, + QETH_DISCIPLINE_LAYER3 = 0, + QETH_DISCIPLINE_LAYER2 = 1, +}; + +struct qeth_discipline { + const struct device_type *devtype; + int (*process_rx_buffer)(struct qeth_card *card, int budget, int *done); + int (*recover)(void *ptr); + int (*setup) (struct ccwgroup_device *); + void (*remove) (struct ccwgroup_device *); + int (*set_online) (struct ccwgroup_device *); + int (*set_offline) (struct ccwgroup_device *); + int (*freeze)(struct ccwgroup_device *); + int (*thaw) (struct ccwgroup_device *); + int (*restore)(struct ccwgroup_device *); + int (*do_ioctl)(struct net_device *dev, struct ifreq *rq, int cmd); + int (*control_event_handler)(struct qeth_card *card, + struct qeth_ipa_cmd *cmd); +}; + +struct qeth_vlan_vid { + struct list_head list; + unsigned short vid; +}; + +enum qeth_addr_disposition { + QETH_DISP_ADDR_DELETE = 0, + QETH_DISP_ADDR_DO_NOTHING = 1, + QETH_DISP_ADDR_ADD = 2, +}; + +struct qeth_rx { + int b_count; + int b_index; + struct qdio_buffer_element *b_element; + int e_offset; + int qdio_err; +}; + +struct carrier_info { + __u8 card_type; + __u16 port_mode; + __u32 port_speed; +}; + +struct qeth_switch_info { + __u32 capabilities; + __u32 settings; +}; + +#define QETH_NAPI_WEIGHT NAPI_POLL_WEIGHT + +struct qeth_card { + struct list_head list; + enum qeth_card_states state; + int lan_online; + spinlock_t lock; + struct ccwgroup_device *gdev; + struct qeth_channel read; + struct qeth_channel write; + struct qeth_channel data; + + struct net_device *dev; + struct net_device_stats stats; + + struct qeth_card_info info; + struct qeth_token token; + struct qeth_seqno seqno; + struct qeth_card_options options; + + wait_queue_head_t wait_q; + spinlock_t mclock; + unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)]; + struct mutex vid_list_mutex; /* vid_list */ + struct list_head vid_list; + DECLARE_HASHTABLE(mac_htable, 4); + DECLARE_HASHTABLE(ip_htable, 4); + DECLARE_HASHTABLE(ip_mc_htable, 4); + struct work_struct kernel_thread_starter; + spinlock_t thread_mask_lock; + unsigned long thread_start_mask; + unsigned long thread_allowed_mask; + unsigned long thread_running_mask; + struct task_struct *recovery_task; + spinlock_t ip_lock; + struct qeth_ipato ipato; + struct list_head cmd_waiter_list; + /* QDIO buffer handling */ + struct qeth_qdio_info qdio; + struct qeth_perf_stats perf_stats; + int read_or_write_problem; + struct qeth_osn_info osn_info; + struct qeth_discipline *discipline; + atomic_t force_alloc_skb; + struct service_level qeth_service_level; + struct qdio_ssqd_desc ssqd; + debug_info_t *debug; + struct mutex conf_mutex; + struct mutex discipline_mutex; + struct napi_struct napi; + struct qeth_rx rx; + struct delayed_work buffer_reclaim_work; + int reclaim_index; + struct work_struct close_dev_work; +}; + +struct qeth_card_list_struct { + struct list_head list; + rwlock_t rwlock; +}; + +struct qeth_trap_id { + __u16 lparnr; + char vmname[8]; + __u8 chpid; + __u8 ssid; + __u16 devno; +} __packed; + +/*some helper functions*/ +#define QETH_CARD_IFNAME(card) (((card)->dev)? (card)->dev->name : "") + +static inline bool qeth_netdev_is_registered(struct net_device *dev) +{ + return dev->netdev_ops != NULL; +} + +static inline void qeth_scrub_qdio_buffer(struct qdio_buffer *buf, + unsigned int elements) +{ + unsigned int i; + + for (i = 0; i < elements; i++) + memset(&buf->element[i], 0, sizeof(struct qdio_buffer_element)); + buf->element[14].sflags = 0; + buf->element[15].sflags = 0; +} + +/** + * qeth_get_elements_for_range() - find number of SBALEs to cover range. + * @start: Start of the address range. + * @end: Address after the end of the range. + * + * Returns the number of pages, and thus QDIO buffer elements, needed to cover + * the specified address range. + */ +static inline int qeth_get_elements_for_range(addr_t start, addr_t end) +{ + return PFN_UP(end) - PFN_DOWN(start); +} + +static inline int qeth_get_micros(void) +{ + return (int) (get_tod_clock() >> 12); +} + +static inline int qeth_get_ip_version(struct sk_buff *skb) +{ + struct vlan_ethhdr *veth = vlan_eth_hdr(skb); + __be16 prot = veth->h_vlan_proto; + + if (prot == htons(ETH_P_8021Q)) + prot = veth->h_vlan_encapsulated_proto; + + switch (prot) { + case htons(ETH_P_IPV6): + return 6; + case htons(ETH_P_IP): + return 4; + default: + return 0; + } +} + +static inline void qeth_rx_csum(struct qeth_card *card, struct sk_buff *skb, + u8 flags) +{ + if ((card->dev->features & NETIF_F_RXCSUM) && + (flags & QETH_HDR_EXT_CSUM_TRANSP_REQ)) { + skb->ip_summed = CHECKSUM_UNNECESSARY; + if (card->options.performance_stats) + card->perf_stats.rx_csum++; + } else { + skb->ip_summed = CHECKSUM_NONE; + } +} + +static inline void qeth_tx_csum(struct sk_buff *skb, u8 *flags, int ipv) +{ + *flags |= QETH_HDR_EXT_CSUM_TRANSP_REQ; + if ((ipv == 4 && ip_hdr(skb)->protocol == IPPROTO_UDP) || + (ipv == 6 && ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)) + *flags |= QETH_HDR_EXT_UDP; + if (ipv == 4) { + /* some HW requires combined L3+L4 csum offload: */ + *flags |= QETH_HDR_EXT_CSUM_HDR_REQ; + ip_hdr(skb)->check = 0; + } +} + +static inline void qeth_put_buffer_pool_entry(struct qeth_card *card, + struct qeth_buffer_pool_entry *entry) +{ + list_add_tail(&entry->list, &card->qdio.in_buf_pool.entry_list); +} + +static inline int qeth_is_diagass_supported(struct qeth_card *card, + enum qeth_diags_cmds cmd) +{ + return card->info.diagass_support & (__u32)cmd; +} + +int qeth_send_simple_setassparms_prot(struct qeth_card *card, + enum qeth_ipa_funcs ipa_func, + u16 cmd_code, long data, + enum qeth_prot_versions prot); +/* IPv4 variant */ +static inline int qeth_send_simple_setassparms(struct qeth_card *card, + enum qeth_ipa_funcs ipa_func, + u16 cmd_code, long data) +{ + return qeth_send_simple_setassparms_prot(card, ipa_func, cmd_code, + data, QETH_PROT_IPV4); +} + +static inline int qeth_send_simple_setassparms_v6(struct qeth_card *card, + enum qeth_ipa_funcs ipa_func, + u16 cmd_code, long data) +{ + return qeth_send_simple_setassparms_prot(card, ipa_func, cmd_code, + data, QETH_PROT_IPV6); +} + +int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb, + int ipv); +static inline struct qeth_qdio_out_q *qeth_get_tx_queue(struct qeth_card *card, + struct sk_buff *skb, + int ipv, int cast_type) +{ + if (IS_IQD(card) && cast_type != RTN_UNICAST) + return card->qdio.out_qs[card->qdio.no_out_queues - 1]; + if (!card->qdio.do_prio_queueing) + return card->qdio.out_qs[card->qdio.default_out_queue]; + return card->qdio.out_qs[qeth_get_priority_queue(card, skb, ipv)]; +} + +extern struct qeth_discipline qeth_l2_discipline; +extern struct qeth_discipline qeth_l3_discipline; +extern const struct attribute_group *qeth_generic_attr_groups[]; +extern const struct attribute_group *qeth_osn_attr_groups[]; +extern const struct attribute_group qeth_device_attr_group; +extern const struct attribute_group qeth_device_blkt_group; +extern const struct device_type qeth_generic_devtype; +extern struct workqueue_struct *qeth_wq; + +int qeth_card_hw_is_reachable(struct qeth_card *); +const char *qeth_get_cardname_short(struct qeth_card *); +int qeth_realloc_buffer_pool(struct qeth_card *, int); +int qeth_core_load_discipline(struct qeth_card *, enum qeth_discipline_id); +void qeth_core_free_discipline(struct qeth_card *); + +/* exports for qeth discipline device drivers */ +extern struct qeth_card_list_struct qeth_core_card_list; +extern struct kmem_cache *qeth_core_header_cache; +extern struct qeth_dbf_info qeth_dbf[QETH_DBF_INFOS]; + +struct net_device *qeth_clone_netdev(struct net_device *orig); +void qeth_set_recovery_task(struct qeth_card *); +void qeth_clear_recovery_task(struct qeth_card *); +void qeth_set_allowed_threads(struct qeth_card *, unsigned long , int); +int qeth_threads_running(struct qeth_card *, unsigned long); +int qeth_wait_for_threads(struct qeth_card *, unsigned long); +int qeth_do_run_thread(struct qeth_card *, unsigned long); +void qeth_clear_thread_start_bit(struct qeth_card *, unsigned long); +void qeth_clear_thread_running_bit(struct qeth_card *, unsigned long); +int qeth_core_hardsetup_card(struct qeth_card *); +void qeth_print_status_message(struct qeth_card *); +int qeth_init_qdio_queues(struct qeth_card *); +int qeth_send_ipa_cmd(struct qeth_card *, struct qeth_cmd_buffer *, + int (*reply_cb) + (struct qeth_card *, struct qeth_reply *, unsigned long), + void *); +struct qeth_cmd_buffer *qeth_get_ipacmd_buffer(struct qeth_card *, + enum qeth_ipa_cmds, enum qeth_prot_versions); +struct sk_buff *qeth_core_get_next_skb(struct qeth_card *, + struct qeth_qdio_buffer *, struct qdio_buffer_element **, int *, + struct qeth_hdr **); +void qeth_schedule_recovery(struct qeth_card *); +int qeth_poll(struct napi_struct *napi, int budget); +void qeth_clear_ipacmd_list(struct qeth_card *); +int qeth_qdio_clear_card(struct qeth_card *, int); +void qeth_clear_working_pool_list(struct qeth_card *); +void qeth_clear_cmd_buffers(struct qeth_channel *); +void qeth_clear_qdio_buffers(struct qeth_card *); +void qeth_setadp_promisc_mode(struct qeth_card *); +struct net_device_stats *qeth_get_stats(struct net_device *); +int qeth_setadpparms_change_macaddr(struct qeth_card *); +void qeth_tx_timeout(struct net_device *); +void qeth_prepare_control_data(struct qeth_card *, int, + struct qeth_cmd_buffer *); +void qeth_release_buffer(struct qeth_channel *, struct qeth_cmd_buffer *); +void qeth_prepare_ipa_cmd(struct qeth_card *card, struct qeth_cmd_buffer *iob); +struct qeth_cmd_buffer *qeth_wait_for_buffer(struct qeth_channel *); +int qeth_query_switch_attributes(struct qeth_card *card, + struct qeth_switch_info *sw_info); +int qeth_send_control_data(struct qeth_card *, int, struct qeth_cmd_buffer *, + int (*reply_cb)(struct qeth_card *, struct qeth_reply*, unsigned long), + void *reply_param); +int qeth_get_elements_no(struct qeth_card *card, struct sk_buff *skb, + int extra_elems, int data_offset); +int qeth_get_elements_for_frags(struct sk_buff *); +int qeth_do_send_packet_fast(struct qeth_qdio_out_q *queue, struct sk_buff *skb, + struct qeth_hdr *hdr, unsigned int offset, + unsigned int hd_len); +int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue, + struct sk_buff *skb, struct qeth_hdr *hdr, + unsigned int offset, unsigned int hd_len, + int elements_needed); +int qeth_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); +int qeth_core_get_sset_count(struct net_device *, int); +void qeth_core_get_ethtool_stats(struct net_device *, + struct ethtool_stats *, u64 *); +void qeth_core_get_strings(struct net_device *, u32, u8 *); +void qeth_core_get_drvinfo(struct net_device *, struct ethtool_drvinfo *); +void qeth_dbf_longtext(debug_info_t *id, int level, char *text, ...); +int qeth_core_ethtool_get_link_ksettings(struct net_device *netdev, + struct ethtool_link_ksettings *cmd); +int qeth_set_access_ctrl_online(struct qeth_card *card, int fallback); +int qeth_hdr_chk_and_bounce(struct sk_buff *, struct qeth_hdr **, int); +int qeth_configure_cq(struct qeth_card *, enum qeth_cq); +int qeth_hw_trap(struct qeth_card *, enum qeth_diags_trap_action); +void qeth_trace_features(struct qeth_card *); +void qeth_close_dev(struct qeth_card *); +int qeth_send_setassparms(struct qeth_card *, struct qeth_cmd_buffer *, __u16, + long, + int (*reply_cb)(struct qeth_card *, + struct qeth_reply *, unsigned long), + void *); +int qeth_setassparms_cb(struct qeth_card *, struct qeth_reply *, unsigned long); +struct qeth_cmd_buffer *qeth_get_setassparms_cmd(struct qeth_card *, + enum qeth_ipa_funcs, + __u16, __u16, + enum qeth_prot_versions); +int qeth_set_features(struct net_device *, netdev_features_t); +void qeth_enable_hw_features(struct net_device *dev); +netdev_features_t qeth_fix_features(struct net_device *, netdev_features_t); +netdev_features_t qeth_features_check(struct sk_buff *skb, + struct net_device *dev, + netdev_features_t features); +int qeth_vm_request_mac(struct qeth_card *card); +int qeth_add_hw_header(struct qeth_card *card, struct sk_buff *skb, + struct qeth_hdr **hdr, unsigned int hdr_len, + unsigned int proto_len, unsigned int *elements); + +/* exports for OSN */ +int qeth_osn_assist(struct net_device *, void *, int); +int qeth_osn_register(unsigned char *read_dev_no, struct net_device **, + int (*assist_cb)(struct net_device *, void *), + int (*data_cb)(struct sk_buff *)); +void qeth_osn_deregister(struct net_device *); + +#endif /* __QETH_CORE_H__ */ diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c new file mode 100644 index 000000000..d0aaef937 --- /dev/null +++ b/drivers/s390/net/qeth_core_main.c @@ -0,0 +1,6687 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2007, 2009 + * Author(s): Utz Bacher , + * Frank Pavlic , + * Thomas Spatzier , + * Frank Blaschka + */ + +#define KMSG_COMPONENT "qeth" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "qeth_core.h" + +struct qeth_dbf_info qeth_dbf[QETH_DBF_INFOS] = { + /* define dbf - Name, Pages, Areas, Maxlen, Level, View, Handle */ + /* N P A M L V H */ + [QETH_DBF_SETUP] = {"qeth_setup", + 8, 1, 8, 5, &debug_hex_ascii_view, NULL}, + [QETH_DBF_MSG] = {"qeth_msg", 8, 1, 11 * sizeof(long), 3, + &debug_sprintf_view, NULL}, + [QETH_DBF_CTRL] = {"qeth_control", + 8, 1, QETH_DBF_CTRL_LEN, 5, &debug_hex_ascii_view, NULL}, +}; +EXPORT_SYMBOL_GPL(qeth_dbf); + +struct qeth_card_list_struct qeth_core_card_list; +EXPORT_SYMBOL_GPL(qeth_core_card_list); +struct kmem_cache *qeth_core_header_cache; +EXPORT_SYMBOL_GPL(qeth_core_header_cache); +static struct kmem_cache *qeth_qdio_outbuf_cache; + +static struct device *qeth_core_root_dev; +static struct lock_class_key qdio_out_skb_queue_key; +static struct mutex qeth_mod_mutex; + +static void qeth_send_control_data_cb(struct qeth_channel *, + struct qeth_cmd_buffer *); +static struct qeth_cmd_buffer *qeth_get_buffer(struct qeth_channel *); +static void qeth_free_buffer_pool(struct qeth_card *); +static int qeth_qdio_establish(struct qeth_card *); +static void qeth_free_qdio_buffers(struct qeth_card *); +static void qeth_notify_skbs(struct qeth_qdio_out_q *queue, + struct qeth_qdio_out_buffer *buf, + enum iucv_tx_notify notification); +static void qeth_release_skbs(struct qeth_qdio_out_buffer *buf); +static int qeth_init_qdio_out_buf(struct qeth_qdio_out_q *, int); + +struct workqueue_struct *qeth_wq; +EXPORT_SYMBOL_GPL(qeth_wq); + +int qeth_card_hw_is_reachable(struct qeth_card *card) +{ + return (card->state == CARD_STATE_SOFTSETUP) || + (card->state == CARD_STATE_UP); +} +EXPORT_SYMBOL_GPL(qeth_card_hw_is_reachable); + +static void qeth_close_dev_handler(struct work_struct *work) +{ + struct qeth_card *card; + + card = container_of(work, struct qeth_card, close_dev_work); + QETH_CARD_TEXT(card, 2, "cldevhdl"); + rtnl_lock(); + dev_close(card->dev); + rtnl_unlock(); + ccwgroup_set_offline(card->gdev); +} + +void qeth_close_dev(struct qeth_card *card) +{ + QETH_CARD_TEXT(card, 2, "cldevsubm"); + queue_work(qeth_wq, &card->close_dev_work); +} +EXPORT_SYMBOL_GPL(qeth_close_dev); + +static const char *qeth_get_cardname(struct qeth_card *card) +{ + if (card->info.guestlan) { + switch (card->info.type) { + case QETH_CARD_TYPE_OSD: + return " Virtual NIC QDIO"; + case QETH_CARD_TYPE_IQD: + return " Virtual NIC Hiper"; + case QETH_CARD_TYPE_OSM: + return " Virtual NIC QDIO - OSM"; + case QETH_CARD_TYPE_OSX: + return " Virtual NIC QDIO - OSX"; + default: + return " unknown"; + } + } else { + switch (card->info.type) { + case QETH_CARD_TYPE_OSD: + return " OSD Express"; + case QETH_CARD_TYPE_IQD: + return " HiperSockets"; + case QETH_CARD_TYPE_OSN: + return " OSN QDIO"; + case QETH_CARD_TYPE_OSM: + return " OSM QDIO"; + case QETH_CARD_TYPE_OSX: + return " OSX QDIO"; + default: + return " unknown"; + } + } + return " n/a"; +} + +/* max length to be returned: 14 */ +const char *qeth_get_cardname_short(struct qeth_card *card) +{ + if (card->info.guestlan) { + switch (card->info.type) { + case QETH_CARD_TYPE_OSD: + return "Virt.NIC QDIO"; + case QETH_CARD_TYPE_IQD: + return "Virt.NIC Hiper"; + case QETH_CARD_TYPE_OSM: + return "Virt.NIC OSM"; + case QETH_CARD_TYPE_OSX: + return "Virt.NIC OSX"; + default: + return "unknown"; + } + } else { + switch (card->info.type) { + case QETH_CARD_TYPE_OSD: + switch (card->info.link_type) { + case QETH_LINK_TYPE_FAST_ETH: + return "OSD_100"; + case QETH_LINK_TYPE_HSTR: + return "HSTR"; + case QETH_LINK_TYPE_GBIT_ETH: + return "OSD_1000"; + case QETH_LINK_TYPE_10GBIT_ETH: + return "OSD_10GIG"; + case QETH_LINK_TYPE_LANE_ETH100: + return "OSD_FE_LANE"; + case QETH_LINK_TYPE_LANE_TR: + return "OSD_TR_LANE"; + case QETH_LINK_TYPE_LANE_ETH1000: + return "OSD_GbE_LANE"; + case QETH_LINK_TYPE_LANE: + return "OSD_ATM_LANE"; + default: + return "OSD_Express"; + } + case QETH_CARD_TYPE_IQD: + return "HiperSockets"; + case QETH_CARD_TYPE_OSN: + return "OSN"; + case QETH_CARD_TYPE_OSM: + return "OSM_1000"; + case QETH_CARD_TYPE_OSX: + return "OSX_10GIG"; + default: + return "unknown"; + } + } + return "n/a"; +} + +void qeth_set_recovery_task(struct qeth_card *card) +{ + card->recovery_task = current; +} +EXPORT_SYMBOL_GPL(qeth_set_recovery_task); + +void qeth_clear_recovery_task(struct qeth_card *card) +{ + card->recovery_task = NULL; +} +EXPORT_SYMBOL_GPL(qeth_clear_recovery_task); + +static bool qeth_is_recovery_task(const struct qeth_card *card) +{ + return card->recovery_task == current; +} + +void qeth_set_allowed_threads(struct qeth_card *card, unsigned long threads, + int clear_start_mask) +{ + unsigned long flags; + + spin_lock_irqsave(&card->thread_mask_lock, flags); + card->thread_allowed_mask = threads; + if (clear_start_mask) + card->thread_start_mask &= threads; + spin_unlock_irqrestore(&card->thread_mask_lock, flags); + wake_up(&card->wait_q); +} +EXPORT_SYMBOL_GPL(qeth_set_allowed_threads); + +int qeth_threads_running(struct qeth_card *card, unsigned long threads) +{ + unsigned long flags; + int rc = 0; + + spin_lock_irqsave(&card->thread_mask_lock, flags); + rc = (card->thread_running_mask & threads); + spin_unlock_irqrestore(&card->thread_mask_lock, flags); + return rc; +} +EXPORT_SYMBOL_GPL(qeth_threads_running); + +int qeth_wait_for_threads(struct qeth_card *card, unsigned long threads) +{ + if (qeth_is_recovery_task(card)) + return 0; + return wait_event_interruptible(card->wait_q, + qeth_threads_running(card, threads) == 0); +} +EXPORT_SYMBOL_GPL(qeth_wait_for_threads); + +void qeth_clear_working_pool_list(struct qeth_card *card) +{ + struct qeth_buffer_pool_entry *pool_entry, *tmp; + + QETH_CARD_TEXT(card, 5, "clwrklst"); + list_for_each_entry_safe(pool_entry, tmp, + &card->qdio.in_buf_pool.entry_list, list){ + list_del(&pool_entry->list); + } +} +EXPORT_SYMBOL_GPL(qeth_clear_working_pool_list); + +static int qeth_alloc_buffer_pool(struct qeth_card *card) +{ + struct qeth_buffer_pool_entry *pool_entry; + void *ptr; + int i, j; + + QETH_CARD_TEXT(card, 5, "alocpool"); + for (i = 0; i < card->qdio.init_pool.buf_count; ++i) { + pool_entry = kzalloc(sizeof(*pool_entry), GFP_KERNEL); + if (!pool_entry) { + qeth_free_buffer_pool(card); + return -ENOMEM; + } + for (j = 0; j < QETH_MAX_BUFFER_ELEMENTS(card); ++j) { + ptr = (void *) __get_free_page(GFP_KERNEL); + if (!ptr) { + while (j > 0) + free_page((unsigned long) + pool_entry->elements[--j]); + kfree(pool_entry); + qeth_free_buffer_pool(card); + return -ENOMEM; + } + pool_entry->elements[j] = ptr; + } + list_add(&pool_entry->init_list, + &card->qdio.init_pool.entry_list); + } + return 0; +} + +int qeth_realloc_buffer_pool(struct qeth_card *card, int bufcnt) +{ + QETH_CARD_TEXT(card, 2, "realcbp"); + + if ((card->state != CARD_STATE_DOWN) && + (card->state != CARD_STATE_RECOVER)) + return -EPERM; + + /* TODO: steel/add buffers from/to a running card's buffer pool (?) */ + qeth_clear_working_pool_list(card); + qeth_free_buffer_pool(card); + card->qdio.in_buf_pool.buf_count = bufcnt; + card->qdio.init_pool.buf_count = bufcnt; + return qeth_alloc_buffer_pool(card); +} +EXPORT_SYMBOL_GPL(qeth_realloc_buffer_pool); + +static void qeth_free_qdio_queue(struct qeth_qdio_q *q) +{ + if (!q) + return; + + qdio_free_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q); + kfree(q); +} + +static struct qeth_qdio_q *qeth_alloc_qdio_queue(void) +{ + struct qeth_qdio_q *q = kzalloc(sizeof(*q), GFP_KERNEL); + int i; + + if (!q) + return NULL; + + if (qdio_alloc_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q)) { + kfree(q); + return NULL; + } + + for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; ++i) + q->bufs[i].buffer = q->qdio_bufs[i]; + + QETH_DBF_HEX(SETUP, 2, &q, sizeof(void *)); + return q; +} + +static int qeth_cq_init(struct qeth_card *card) +{ + int rc; + + if (card->options.cq == QETH_CQ_ENABLED) { + QETH_DBF_TEXT(SETUP, 2, "cqinit"); + qdio_reset_buffers(card->qdio.c_q->qdio_bufs, + QDIO_MAX_BUFFERS_PER_Q); + card->qdio.c_q->next_buf_to_init = 127; + rc = do_QDIO(CARD_DDEV(card), QDIO_FLAG_SYNC_INPUT, + card->qdio.no_in_queues - 1, 0, + 127); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "1err%d", rc); + goto out; + } + } + rc = 0; +out: + return rc; +} + +static int qeth_alloc_cq(struct qeth_card *card) +{ + int rc; + + if (card->options.cq == QETH_CQ_ENABLED) { + int i; + struct qdio_outbuf_state *outbuf_states; + + QETH_DBF_TEXT(SETUP, 2, "cqon"); + card->qdio.c_q = qeth_alloc_qdio_queue(); + if (!card->qdio.c_q) { + rc = -1; + goto kmsg_out; + } + card->qdio.no_in_queues = 2; + card->qdio.out_bufstates = + kcalloc(card->qdio.no_out_queues * + QDIO_MAX_BUFFERS_PER_Q, + sizeof(struct qdio_outbuf_state), + GFP_KERNEL); + outbuf_states = card->qdio.out_bufstates; + if (outbuf_states == NULL) { + rc = -1; + goto free_cq_out; + } + for (i = 0; i < card->qdio.no_out_queues; ++i) { + card->qdio.out_qs[i]->bufstates = outbuf_states; + outbuf_states += QDIO_MAX_BUFFERS_PER_Q; + } + } else { + QETH_DBF_TEXT(SETUP, 2, "nocq"); + card->qdio.c_q = NULL; + card->qdio.no_in_queues = 1; + } + QETH_DBF_TEXT_(SETUP, 2, "iqc%d", card->qdio.no_in_queues); + rc = 0; +out: + return rc; +free_cq_out: + qeth_free_qdio_queue(card->qdio.c_q); + card->qdio.c_q = NULL; +kmsg_out: + dev_err(&card->gdev->dev, "Failed to create completion queue\n"); + goto out; +} + +static void qeth_free_cq(struct qeth_card *card) +{ + if (card->qdio.c_q) { + --card->qdio.no_in_queues; + qeth_free_qdio_queue(card->qdio.c_q); + card->qdio.c_q = NULL; + } + kfree(card->qdio.out_bufstates); + card->qdio.out_bufstates = NULL; +} + +static enum iucv_tx_notify qeth_compute_cq_notification(int sbalf15, + int delayed) +{ + enum iucv_tx_notify n; + + switch (sbalf15) { + case 0: + n = delayed ? TX_NOTIFY_DELAYED_OK : TX_NOTIFY_OK; + break; + case 4: + case 16: + case 17: + case 18: + n = delayed ? TX_NOTIFY_DELAYED_UNREACHABLE : + TX_NOTIFY_UNREACHABLE; + break; + default: + n = delayed ? TX_NOTIFY_DELAYED_GENERALERROR : + TX_NOTIFY_GENERALERROR; + break; + } + + return n; +} + +static void qeth_cleanup_handled_pending(struct qeth_qdio_out_q *q, int bidx, + int forced_cleanup) +{ + if (q->card->options.cq != QETH_CQ_ENABLED) + return; + + if (q->bufs[bidx]->next_pending != NULL) { + struct qeth_qdio_out_buffer *head = q->bufs[bidx]; + struct qeth_qdio_out_buffer *c = q->bufs[bidx]->next_pending; + + while (c) { + if (forced_cleanup || + atomic_read(&c->state) == + QETH_QDIO_BUF_HANDLED_DELAYED) { + struct qeth_qdio_out_buffer *f = c; + QETH_CARD_TEXT(f->q->card, 5, "fp"); + QETH_CARD_TEXT_(f->q->card, 5, "%lx", (long) f); + /* release here to avoid interleaving between + outbound tasklet and inbound tasklet + regarding notifications and lifecycle */ + qeth_release_skbs(c); + + c = f->next_pending; + WARN_ON_ONCE(head->next_pending != f); + head->next_pending = c; + kmem_cache_free(qeth_qdio_outbuf_cache, f); + } else { + head = c; + c = c->next_pending; + } + + } + } +} + + +static void qeth_qdio_handle_aob(struct qeth_card *card, + unsigned long phys_aob_addr) +{ + struct qaob *aob; + struct qeth_qdio_out_buffer *buffer; + enum iucv_tx_notify notification; + unsigned int i; + + aob = (struct qaob *) phys_to_virt(phys_aob_addr); + QETH_CARD_TEXT(card, 5, "haob"); + QETH_CARD_TEXT_(card, 5, "%lx", phys_aob_addr); + buffer = (struct qeth_qdio_out_buffer *) aob->user1; + QETH_CARD_TEXT_(card, 5, "%lx", aob->user1); + + if (atomic_cmpxchg(&buffer->state, QETH_QDIO_BUF_PRIMED, + QETH_QDIO_BUF_IN_CQ) == QETH_QDIO_BUF_PRIMED) { + notification = TX_NOTIFY_OK; + } else { + WARN_ON_ONCE(atomic_read(&buffer->state) != + QETH_QDIO_BUF_PENDING); + atomic_set(&buffer->state, QETH_QDIO_BUF_IN_CQ); + notification = TX_NOTIFY_DELAYED_OK; + } + + if (aob->aorc != 0) { + QETH_CARD_TEXT_(card, 2, "aorc%02X", aob->aorc); + notification = qeth_compute_cq_notification(aob->aorc, 1); + } + qeth_notify_skbs(buffer->q, buffer, notification); + + /* Free dangling allocations. The attached skbs are handled by + * qeth_cleanup_handled_pending(). + */ + for (i = 0; + i < aob->sb_count && i < QETH_MAX_BUFFER_ELEMENTS(card); + i++) { + if (aob->sba[i] && buffer->is_header[i]) + kmem_cache_free(qeth_core_header_cache, + (void *) aob->sba[i]); + } + atomic_set(&buffer->state, QETH_QDIO_BUF_HANDLED_DELAYED); + + qdio_release_aob(aob); +} + +static inline int qeth_is_cq(struct qeth_card *card, unsigned int queue) +{ + return card->options.cq == QETH_CQ_ENABLED && + card->qdio.c_q != NULL && + queue != 0 && + queue == card->qdio.no_in_queues - 1; +} + +static void qeth_setup_ccw(struct ccw1 *ccw, u8 cmd_code, u32 len, void *data) +{ + ccw->cmd_code = cmd_code; + ccw->flags = CCW_FLAG_SLI; + ccw->count = len; + ccw->cda = (__u32) __pa(data); +} + +static int __qeth_issue_next_read(struct qeth_card *card) +{ + struct qeth_channel *channel = &card->read; + struct qeth_cmd_buffer *iob; + int rc; + + QETH_CARD_TEXT(card, 5, "issnxrd"); + if (channel->state != CH_STATE_UP) + return -EIO; + iob = qeth_get_buffer(channel); + if (!iob) { + dev_warn(&card->gdev->dev, "The qeth device driver " + "failed to recover an error on the device\n"); + QETH_DBF_MESSAGE(2, "%s issue_next_read failed: no iob " + "available\n", dev_name(&card->gdev->dev)); + return -ENOMEM; + } + qeth_setup_ccw(channel->ccw, CCW_CMD_READ, QETH_BUFSIZE, iob->data); + QETH_CARD_TEXT(card, 6, "noirqpnd"); + rc = ccw_device_start(channel->ccwdev, channel->ccw, + (addr_t) iob, 0, 0); + if (rc) { + QETH_DBF_MESSAGE(2, "%s error in starting next read ccw! " + "rc=%i\n", dev_name(&card->gdev->dev), rc); + atomic_set(&channel->irq_pending, 0); + qeth_release_buffer(channel, iob); + card->read_or_write_problem = 1; + qeth_schedule_recovery(card); + wake_up(&card->wait_q); + } + return rc; +} + +static int qeth_issue_next_read(struct qeth_card *card) +{ + int ret; + + spin_lock_irq(get_ccwdev_lock(CARD_RDEV(card))); + ret = __qeth_issue_next_read(card); + spin_unlock_irq(get_ccwdev_lock(CARD_RDEV(card))); + + return ret; +} + +static struct qeth_reply *qeth_alloc_reply(struct qeth_card *card) +{ + struct qeth_reply *reply; + + reply = kzalloc(sizeof(struct qeth_reply), GFP_ATOMIC); + if (reply) { + refcount_set(&reply->refcnt, 1); + atomic_set(&reply->received, 0); + reply->card = card; + } + return reply; +} + +static void qeth_get_reply(struct qeth_reply *reply) +{ + refcount_inc(&reply->refcnt); +} + +static void qeth_put_reply(struct qeth_reply *reply) +{ + if (refcount_dec_and_test(&reply->refcnt)) + kfree(reply); +} + +static void qeth_issue_ipa_msg(struct qeth_ipa_cmd *cmd, int rc, + struct qeth_card *card) +{ + const char *ipa_name; + int com = cmd->hdr.command; + ipa_name = qeth_get_ipa_cmd_name(com); + if (rc) + QETH_DBF_MESSAGE(2, "IPA: %s(x%X) for %s/%s returned " + "x%X \"%s\"\n", + ipa_name, com, dev_name(&card->gdev->dev), + QETH_CARD_IFNAME(card), rc, + qeth_get_ipa_msg(rc)); + else + QETH_DBF_MESSAGE(5, "IPA: %s(x%X) for %s/%s succeeded\n", + ipa_name, com, dev_name(&card->gdev->dev), + QETH_CARD_IFNAME(card)); +} + +static struct qeth_ipa_cmd *qeth_check_ipa_data(struct qeth_card *card, + struct qeth_cmd_buffer *iob) +{ + struct qeth_ipa_cmd *cmd = NULL; + + QETH_CARD_TEXT(card, 5, "chkipad"); + if (IS_IPA(iob->data)) { + cmd = (struct qeth_ipa_cmd *) PDU_ENCAPSULATION(iob->data); + if (IS_IPA_REPLY(cmd)) { + if (cmd->hdr.command != IPA_CMD_SETCCID && + cmd->hdr.command != IPA_CMD_DELCCID && + cmd->hdr.command != IPA_CMD_MODCCID && + cmd->hdr.command != IPA_CMD_SET_DIAG_ASS) + qeth_issue_ipa_msg(cmd, + cmd->hdr.return_code, card); + return cmd; + } else { + switch (cmd->hdr.command) { + case IPA_CMD_STOPLAN: + if (cmd->hdr.return_code == + IPA_RC_VEPA_TO_VEB_TRANSITION) { + dev_err(&card->gdev->dev, + "Interface %s is down because the " + "adjacent port is no longer in " + "reflective relay mode\n", + QETH_CARD_IFNAME(card)); + qeth_close_dev(card); + } else { + dev_warn(&card->gdev->dev, + "The link for interface %s on CHPID" + " 0x%X failed\n", + QETH_CARD_IFNAME(card), + card->info.chpid); + qeth_issue_ipa_msg(cmd, + cmd->hdr.return_code, card); + } + card->lan_online = 0; + netif_carrier_off(card->dev); + return NULL; + case IPA_CMD_STARTLAN: + dev_info(&card->gdev->dev, + "The link for %s on CHPID 0x%X has" + " been restored\n", + QETH_CARD_IFNAME(card), + card->info.chpid); + netif_carrier_on(card->dev); + card->lan_online = 1; + if (card->info.hwtrap) + card->info.hwtrap = 2; + qeth_schedule_recovery(card); + return NULL; + case IPA_CMD_SETBRIDGEPORT_IQD: + case IPA_CMD_SETBRIDGEPORT_OSA: + case IPA_CMD_ADDRESS_CHANGE_NOTIF: + if (card->discipline->control_event_handler + (card, cmd)) + return cmd; + else + return NULL; + case IPA_CMD_MODCCID: + return cmd; + case IPA_CMD_REGISTER_LOCAL_ADDR: + QETH_CARD_TEXT(card, 3, "irla"); + break; + case IPA_CMD_UNREGISTER_LOCAL_ADDR: + QETH_CARD_TEXT(card, 3, "urla"); + break; + default: + QETH_DBF_MESSAGE(2, "Received data is IPA " + "but not a reply!\n"); + break; + } + } + } + return cmd; +} + +void qeth_clear_ipacmd_list(struct qeth_card *card) +{ + struct qeth_reply *reply, *r; + unsigned long flags; + + QETH_CARD_TEXT(card, 4, "clipalst"); + + spin_lock_irqsave(&card->lock, flags); + list_for_each_entry_safe(reply, r, &card->cmd_waiter_list, list) { + qeth_get_reply(reply); + reply->rc = -EIO; + atomic_inc(&reply->received); + list_del_init(&reply->list); + wake_up(&reply->wait_q); + qeth_put_reply(reply); + } + spin_unlock_irqrestore(&card->lock, flags); +} +EXPORT_SYMBOL_GPL(qeth_clear_ipacmd_list); + +static int qeth_check_idx_response(struct qeth_card *card, + unsigned char *buffer) +{ + if (!buffer) + return 0; + + QETH_DBF_HEX(CTRL, 2, buffer, QETH_DBF_CTRL_LEN); + if ((buffer[2] & 0xc0) == 0xc0) { + QETH_DBF_MESSAGE(2, "received an IDX TERMINATE with cause code %#02x\n", + buffer[4]); + QETH_CARD_TEXT(card, 2, "ckidxres"); + QETH_CARD_TEXT(card, 2, " idxterm"); + QETH_CARD_TEXT_(card, 2, " rc%d", -EIO); + if (buffer[4] == 0xf6) { + dev_err(&card->gdev->dev, + "The qeth device is not configured " + "for the OSI layer required by z/VM\n"); + return -EPERM; + } + return -EIO; + } + return 0; +} + +static struct qeth_card *CARD_FROM_CDEV(struct ccw_device *cdev) +{ + struct qeth_card *card = dev_get_drvdata(&((struct ccwgroup_device *) + dev_get_drvdata(&cdev->dev))->dev); + return card; +} + +static struct qeth_cmd_buffer *__qeth_get_buffer(struct qeth_channel *channel) +{ + __u8 index; + + QETH_CARD_TEXT(CARD_FROM_CDEV(channel->ccwdev), 6, "getbuff"); + index = channel->io_buf_no; + do { + if (channel->iob[index].state == BUF_STATE_FREE) { + channel->iob[index].state = BUF_STATE_LOCKED; + channel->io_buf_no = (channel->io_buf_no + 1) % + QETH_CMD_BUFFER_NO; + memset(channel->iob[index].data, 0, QETH_BUFSIZE); + return channel->iob + index; + } + index = (index + 1) % QETH_CMD_BUFFER_NO; + } while (index != channel->io_buf_no); + + return NULL; +} + +void qeth_release_buffer(struct qeth_channel *channel, + struct qeth_cmd_buffer *iob) +{ + unsigned long flags; + + QETH_CARD_TEXT(CARD_FROM_CDEV(channel->ccwdev), 6, "relbuff"); + spin_lock_irqsave(&channel->iob_lock, flags); + memset(iob->data, 0, QETH_BUFSIZE); + iob->state = BUF_STATE_FREE; + iob->callback = qeth_send_control_data_cb; + iob->rc = 0; + spin_unlock_irqrestore(&channel->iob_lock, flags); + wake_up(&channel->wait_q); +} +EXPORT_SYMBOL_GPL(qeth_release_buffer); + +static struct qeth_cmd_buffer *qeth_get_buffer(struct qeth_channel *channel) +{ + struct qeth_cmd_buffer *buffer = NULL; + unsigned long flags; + + spin_lock_irqsave(&channel->iob_lock, flags); + buffer = __qeth_get_buffer(channel); + spin_unlock_irqrestore(&channel->iob_lock, flags); + return buffer; +} + +struct qeth_cmd_buffer *qeth_wait_for_buffer(struct qeth_channel *channel) +{ + struct qeth_cmd_buffer *buffer; + wait_event(channel->wait_q, + ((buffer = qeth_get_buffer(channel)) != NULL)); + return buffer; +} +EXPORT_SYMBOL_GPL(qeth_wait_for_buffer); + +void qeth_clear_cmd_buffers(struct qeth_channel *channel) +{ + int cnt; + + for (cnt = 0; cnt < QETH_CMD_BUFFER_NO; cnt++) + qeth_release_buffer(channel, &channel->iob[cnt]); + channel->io_buf_no = 0; +} +EXPORT_SYMBOL_GPL(qeth_clear_cmd_buffers); + +static void qeth_send_control_data_cb(struct qeth_channel *channel, + struct qeth_cmd_buffer *iob) +{ + struct qeth_card *card; + struct qeth_reply *reply, *r; + struct qeth_ipa_cmd *cmd; + unsigned long flags; + int keep_reply; + int rc = 0; + + card = CARD_FROM_CDEV(channel->ccwdev); + QETH_CARD_TEXT(card, 4, "sndctlcb"); + rc = qeth_check_idx_response(card, iob->data); + switch (rc) { + case 0: + break; + case -EIO: + qeth_clear_ipacmd_list(card); + qeth_schedule_recovery(card); + /* fall through */ + default: + goto out; + } + + cmd = qeth_check_ipa_data(card, iob); + if ((cmd == NULL) && (card->state != CARD_STATE_DOWN)) + goto out; + /*in case of OSN : check if cmd is set */ + if (card->info.type == QETH_CARD_TYPE_OSN && + cmd && + cmd->hdr.command != IPA_CMD_STARTLAN && + card->osn_info.assist_cb != NULL) { + card->osn_info.assist_cb(card->dev, cmd); + goto out; + } + + spin_lock_irqsave(&card->lock, flags); + list_for_each_entry_safe(reply, r, &card->cmd_waiter_list, list) { + if ((reply->seqno == QETH_IDX_COMMAND_SEQNO) || + ((cmd) && (reply->seqno == cmd->hdr.seqno))) { + qeth_get_reply(reply); + list_del_init(&reply->list); + spin_unlock_irqrestore(&card->lock, flags); + keep_reply = 0; + if (reply->callback != NULL) { + if (cmd) { + reply->offset = (__u16)((char *)cmd - + (char *)iob->data); + keep_reply = reply->callback(card, + reply, + (unsigned long)cmd); + } else + keep_reply = reply->callback(card, + reply, + (unsigned long)iob); + } + if (cmd) + reply->rc = (u16) cmd->hdr.return_code; + else if (iob->rc) + reply->rc = iob->rc; + if (keep_reply) { + spin_lock_irqsave(&card->lock, flags); + list_add_tail(&reply->list, + &card->cmd_waiter_list); + spin_unlock_irqrestore(&card->lock, flags); + } else { + atomic_inc(&reply->received); + wake_up(&reply->wait_q); + } + qeth_put_reply(reply); + goto out; + } + } + spin_unlock_irqrestore(&card->lock, flags); +out: + memcpy(&card->seqno.pdu_hdr_ack, + QETH_PDU_HEADER_SEQ_NO(iob->data), + QETH_SEQ_NO_LENGTH); + qeth_release_buffer(channel, iob); +} + +static int qeth_set_thread_start_bit(struct qeth_card *card, + unsigned long thread) +{ + unsigned long flags; + + spin_lock_irqsave(&card->thread_mask_lock, flags); + if (!(card->thread_allowed_mask & thread) || + (card->thread_start_mask & thread)) { + spin_unlock_irqrestore(&card->thread_mask_lock, flags); + return -EPERM; + } + card->thread_start_mask |= thread; + spin_unlock_irqrestore(&card->thread_mask_lock, flags); + return 0; +} + +void qeth_clear_thread_start_bit(struct qeth_card *card, unsigned long thread) +{ + unsigned long flags; + + spin_lock_irqsave(&card->thread_mask_lock, flags); + card->thread_start_mask &= ~thread; + spin_unlock_irqrestore(&card->thread_mask_lock, flags); + wake_up(&card->wait_q); +} +EXPORT_SYMBOL_GPL(qeth_clear_thread_start_bit); + +void qeth_clear_thread_running_bit(struct qeth_card *card, unsigned long thread) +{ + unsigned long flags; + + spin_lock_irqsave(&card->thread_mask_lock, flags); + card->thread_running_mask &= ~thread; + spin_unlock_irqrestore(&card->thread_mask_lock, flags); + wake_up_all(&card->wait_q); +} +EXPORT_SYMBOL_GPL(qeth_clear_thread_running_bit); + +static int __qeth_do_run_thread(struct qeth_card *card, unsigned long thread) +{ + unsigned long flags; + int rc = 0; + + spin_lock_irqsave(&card->thread_mask_lock, flags); + if (card->thread_start_mask & thread) { + if ((card->thread_allowed_mask & thread) && + !(card->thread_running_mask & thread)) { + rc = 1; + card->thread_start_mask &= ~thread; + card->thread_running_mask |= thread; + } else + rc = -EPERM; + } + spin_unlock_irqrestore(&card->thread_mask_lock, flags); + return rc; +} + +int qeth_do_run_thread(struct qeth_card *card, unsigned long thread) +{ + int rc = 0; + + wait_event(card->wait_q, + (rc = __qeth_do_run_thread(card, thread)) >= 0); + return rc; +} +EXPORT_SYMBOL_GPL(qeth_do_run_thread); + +void qeth_schedule_recovery(struct qeth_card *card) +{ + QETH_CARD_TEXT(card, 2, "startrec"); + if (qeth_set_thread_start_bit(card, QETH_RECOVER_THREAD) == 0) + schedule_work(&card->kernel_thread_starter); +} +EXPORT_SYMBOL_GPL(qeth_schedule_recovery); + +static int qeth_get_problem(struct ccw_device *cdev, struct irb *irb) +{ + int dstat, cstat; + char *sense; + struct qeth_card *card; + + sense = (char *) irb->ecw; + cstat = irb->scsw.cmd.cstat; + dstat = irb->scsw.cmd.dstat; + card = CARD_FROM_CDEV(cdev); + + if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK | + SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK | + SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) { + QETH_CARD_TEXT(card, 2, "CGENCHK"); + dev_warn(&cdev->dev, "The qeth device driver " + "failed to recover an error on the device\n"); + QETH_DBF_MESSAGE(2, "%s check on device dstat=x%x, cstat=x%x\n", + dev_name(&cdev->dev), dstat, cstat); + print_hex_dump(KERN_WARNING, "qeth: irb ", DUMP_PREFIX_OFFSET, + 16, 1, irb, 64, 1); + return 1; + } + + if (dstat & DEV_STAT_UNIT_CHECK) { + if (sense[SENSE_RESETTING_EVENT_BYTE] & + SENSE_RESETTING_EVENT_FLAG) { + QETH_CARD_TEXT(card, 2, "REVIND"); + return 1; + } + if (sense[SENSE_COMMAND_REJECT_BYTE] & + SENSE_COMMAND_REJECT_FLAG) { + QETH_CARD_TEXT(card, 2, "CMDREJi"); + return 1; + } + if ((sense[2] == 0xaf) && (sense[3] == 0xfe)) { + QETH_CARD_TEXT(card, 2, "AFFE"); + return 1; + } + if ((!sense[0]) && (!sense[1]) && (!sense[2]) && (!sense[3])) { + QETH_CARD_TEXT(card, 2, "ZEROSEN"); + return 0; + } + QETH_CARD_TEXT(card, 2, "DGENCHK"); + return 1; + } + return 0; +} + +static long __qeth_check_irb_error(struct ccw_device *cdev, + unsigned long intparm, struct irb *irb) +{ + struct qeth_card *card; + + card = CARD_FROM_CDEV(cdev); + + if (!card || !IS_ERR(irb)) + return 0; + + switch (PTR_ERR(irb)) { + case -EIO: + QETH_DBF_MESSAGE(2, "%s i/o-error on device\n", + dev_name(&cdev->dev)); + QETH_CARD_TEXT(card, 2, "ckirberr"); + QETH_CARD_TEXT_(card, 2, " rc%d", -EIO); + break; + case -ETIMEDOUT: + dev_warn(&cdev->dev, "A hardware operation timed out" + " on the device\n"); + QETH_CARD_TEXT(card, 2, "ckirberr"); + QETH_CARD_TEXT_(card, 2, " rc%d", -ETIMEDOUT); + if (intparm == QETH_RCD_PARM) { + if (card->data.ccwdev == cdev) { + card->data.state = CH_STATE_DOWN; + wake_up(&card->wait_q); + } + } + break; + default: + QETH_DBF_MESSAGE(2, "%s unknown error %ld on device\n", + dev_name(&cdev->dev), PTR_ERR(irb)); + QETH_CARD_TEXT(card, 2, "ckirberr"); + QETH_CARD_TEXT(card, 2, " rc???"); + } + return PTR_ERR(irb); +} + +static void qeth_irq(struct ccw_device *cdev, unsigned long intparm, + struct irb *irb) +{ + int rc; + int cstat, dstat; + struct qeth_cmd_buffer *iob = NULL; + struct qeth_channel *channel; + struct qeth_card *card; + + card = CARD_FROM_CDEV(cdev); + if (!card) + return; + + QETH_CARD_TEXT(card, 5, "irq"); + + if (card->read.ccwdev == cdev) { + channel = &card->read; + QETH_CARD_TEXT(card, 5, "read"); + } else if (card->write.ccwdev == cdev) { + channel = &card->write; + QETH_CARD_TEXT(card, 5, "write"); + } else { + channel = &card->data; + QETH_CARD_TEXT(card, 5, "data"); + } + + if (qeth_intparm_is_iob(intparm)) + iob = (struct qeth_cmd_buffer *) __va((addr_t)intparm); + + if (__qeth_check_irb_error(cdev, intparm, irb)) { + /* IO was terminated, free its resources. */ + if (iob) + qeth_release_buffer(iob->channel, iob); + atomic_set(&channel->irq_pending, 0); + wake_up(&card->wait_q); + return; + } + + atomic_set(&channel->irq_pending, 0); + + if (irb->scsw.cmd.fctl & (SCSW_FCTL_CLEAR_FUNC)) + channel->state = CH_STATE_STOPPED; + + if (irb->scsw.cmd.fctl & (SCSW_FCTL_HALT_FUNC)) + channel->state = CH_STATE_HALTED; + + /*let's wake up immediately on data channel*/ + if ((channel == &card->data) && (intparm != 0) && + (intparm != QETH_RCD_PARM)) + goto out; + + if (intparm == QETH_CLEAR_CHANNEL_PARM) { + QETH_CARD_TEXT(card, 6, "clrchpar"); + /* we don't have to handle this further */ + intparm = 0; + } + if (intparm == QETH_HALT_CHANNEL_PARM) { + QETH_CARD_TEXT(card, 6, "hltchpar"); + /* we don't have to handle this further */ + intparm = 0; + } + + cstat = irb->scsw.cmd.cstat; + dstat = irb->scsw.cmd.dstat; + + if ((dstat & DEV_STAT_UNIT_EXCEP) || + (dstat & DEV_STAT_UNIT_CHECK) || + (cstat)) { + if (irb->esw.esw0.erw.cons) { + dev_warn(&channel->ccwdev->dev, + "The qeth device driver failed to recover " + "an error on the device\n"); + QETH_DBF_MESSAGE(2, "%s sense data available. cstat " + "0x%X dstat 0x%X\n", + dev_name(&channel->ccwdev->dev), cstat, dstat); + print_hex_dump(KERN_WARNING, "qeth: irb ", + DUMP_PREFIX_OFFSET, 16, 1, irb, 32, 1); + print_hex_dump(KERN_WARNING, "qeth: sense data ", + DUMP_PREFIX_OFFSET, 16, 1, irb->ecw, 32, 1); + } + if (intparm == QETH_RCD_PARM) { + channel->state = CH_STATE_DOWN; + goto out; + } + rc = qeth_get_problem(cdev, irb); + if (rc) { + card->read_or_write_problem = 1; + if (iob) + qeth_release_buffer(iob->channel, iob); + qeth_clear_ipacmd_list(card); + qeth_schedule_recovery(card); + goto out; + } + } + + if (intparm == QETH_RCD_PARM) { + channel->state = CH_STATE_RCD_DONE; + goto out; + } + if (channel == &card->data) + return; + if (channel == &card->read && + channel->state == CH_STATE_UP) + __qeth_issue_next_read(card); + + if (iob && iob->callback) + iob->callback(iob->channel, iob); + +out: + wake_up(&card->wait_q); + return; +} + +static void qeth_notify_skbs(struct qeth_qdio_out_q *q, + struct qeth_qdio_out_buffer *buf, + enum iucv_tx_notify notification) +{ + struct sk_buff *skb; + + if (skb_queue_empty(&buf->skb_list)) + goto out; + skb = skb_peek(&buf->skb_list); + while (skb) { + QETH_CARD_TEXT_(q->card, 5, "skbn%d", notification); + QETH_CARD_TEXT_(q->card, 5, "%lx", (long) skb); + if (be16_to_cpu(skb->protocol) == ETH_P_AF_IUCV) { + if (skb->sk) { + struct iucv_sock *iucv = iucv_sk(skb->sk); + iucv->sk_txnotify(skb, notification); + } + } + if (skb_queue_is_last(&buf->skb_list, skb)) + skb = NULL; + else + skb = skb_queue_next(&buf->skb_list, skb); + } +out: + return; +} + +static void qeth_release_skbs(struct qeth_qdio_out_buffer *buf) +{ + struct sk_buff *skb; + struct iucv_sock *iucv; + int notify_general_error = 0; + + if (atomic_read(&buf->state) == QETH_QDIO_BUF_PENDING) + notify_general_error = 1; + + /* release may never happen from within CQ tasklet scope */ + WARN_ON_ONCE(atomic_read(&buf->state) == QETH_QDIO_BUF_IN_CQ); + + skb = skb_dequeue(&buf->skb_list); + while (skb) { + QETH_CARD_TEXT(buf->q->card, 5, "skbr"); + QETH_CARD_TEXT_(buf->q->card, 5, "%lx", (long) skb); + if (notify_general_error && + be16_to_cpu(skb->protocol) == ETH_P_AF_IUCV) { + if (skb->sk) { + iucv = iucv_sk(skb->sk); + iucv->sk_txnotify(skb, TX_NOTIFY_GENERALERROR); + } + } + refcount_dec(&skb->users); + dev_kfree_skb_any(skb); + skb = skb_dequeue(&buf->skb_list); + } +} + +static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue, + struct qeth_qdio_out_buffer *buf) +{ + int i; + + /* is PCI flag set on buffer? */ + if (buf->buffer->element[0].sflags & SBAL_SFLAGS0_PCI_REQ) + atomic_dec(&queue->set_pci_flags_count); + + qeth_release_skbs(buf); + + for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(queue->card); ++i) { + if (buf->buffer->element[i].addr && buf->is_header[i]) + kmem_cache_free(qeth_core_header_cache, + buf->buffer->element[i].addr); + buf->is_header[i] = 0; + } + + qeth_scrub_qdio_buffer(buf->buffer, + QETH_MAX_BUFFER_ELEMENTS(queue->card)); + buf->next_element_to_fill = 0; + atomic_set(&buf->state, QETH_QDIO_BUF_EMPTY); +} + +static void qeth_clear_outq_buffers(struct qeth_qdio_out_q *q, int free) +{ + int j; + + for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) { + if (!q->bufs[j]) + continue; + qeth_cleanup_handled_pending(q, j, 1); + qeth_clear_output_buffer(q, q->bufs[j]); + if (free) { + kmem_cache_free(qeth_qdio_outbuf_cache, q->bufs[j]); + q->bufs[j] = NULL; + } + } +} + +void qeth_clear_qdio_buffers(struct qeth_card *card) +{ + int i; + + QETH_CARD_TEXT(card, 2, "clearqdbf"); + /* clear outbound buffers to free skbs */ + for (i = 0; i < card->qdio.no_out_queues; ++i) { + if (card->qdio.out_qs[i]) { + qeth_clear_outq_buffers(card->qdio.out_qs[i], 0); + } + } +} +EXPORT_SYMBOL_GPL(qeth_clear_qdio_buffers); + +static void qeth_free_buffer_pool(struct qeth_card *card) +{ + struct qeth_buffer_pool_entry *pool_entry, *tmp; + int i = 0; + list_for_each_entry_safe(pool_entry, tmp, + &card->qdio.init_pool.entry_list, init_list){ + for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) + free_page((unsigned long)pool_entry->elements[i]); + list_del(&pool_entry->init_list); + kfree(pool_entry); + } +} + +static void qeth_clean_channel(struct qeth_channel *channel) +{ + struct ccw_device *cdev = channel->ccwdev; + int cnt; + + QETH_DBF_TEXT(SETUP, 2, "freech"); + + spin_lock_irq(get_ccwdev_lock(cdev)); + cdev->handler = NULL; + spin_unlock_irq(get_ccwdev_lock(cdev)); + + for (cnt = 0; cnt < QETH_CMD_BUFFER_NO; cnt++) + kfree(channel->iob[cnt].data); + kfree(channel->ccw); +} + +static int qeth_setup_channel(struct qeth_channel *channel, bool alloc_buffers) +{ + struct ccw_device *cdev = channel->ccwdev; + int cnt; + + QETH_DBF_TEXT(SETUP, 2, "setupch"); + + channel->ccw = kmalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); + if (!channel->ccw) + return -ENOMEM; + channel->state = CH_STATE_DOWN; + atomic_set(&channel->irq_pending, 0); + init_waitqueue_head(&channel->wait_q); + + spin_lock_irq(get_ccwdev_lock(cdev)); + cdev->handler = qeth_irq; + spin_unlock_irq(get_ccwdev_lock(cdev)); + + if (!alloc_buffers) + return 0; + + for (cnt = 0; cnt < QETH_CMD_BUFFER_NO; cnt++) { + channel->iob[cnt].data = + kzalloc(QETH_BUFSIZE, GFP_DMA|GFP_KERNEL); + if (channel->iob[cnt].data == NULL) + break; + channel->iob[cnt].state = BUF_STATE_FREE; + channel->iob[cnt].channel = channel; + channel->iob[cnt].callback = qeth_send_control_data_cb; + channel->iob[cnt].rc = 0; + } + if (cnt < QETH_CMD_BUFFER_NO) { + qeth_clean_channel(channel); + return -ENOMEM; + } + channel->io_buf_no = 0; + spin_lock_init(&channel->iob_lock); + + return 0; +} + +static void qeth_set_single_write_queues(struct qeth_card *card) +{ + if ((atomic_read(&card->qdio.state) != QETH_QDIO_UNINITIALIZED) && + (card->qdio.no_out_queues == 4)) + qeth_free_qdio_buffers(card); + + card->qdio.no_out_queues = 1; + if (card->qdio.default_out_queue != 0) + dev_info(&card->gdev->dev, "Priority Queueing not supported\n"); + + card->qdio.default_out_queue = 0; +} + +static void qeth_set_multiple_write_queues(struct qeth_card *card) +{ + if ((atomic_read(&card->qdio.state) != QETH_QDIO_UNINITIALIZED) && + (card->qdio.no_out_queues == 1)) { + qeth_free_qdio_buffers(card); + card->qdio.default_out_queue = 2; + } + card->qdio.no_out_queues = 4; +} + +static int qeth_update_from_chp_desc(struct qeth_card *card) +{ + struct ccw_device *ccwdev; + struct channel_path_desc_fmt0 *chp_dsc; + + QETH_DBF_TEXT(SETUP, 2, "chp_desc"); + + ccwdev = card->data.ccwdev; + chp_dsc = ccw_device_get_chp_desc(ccwdev, 0); + if (!chp_dsc) + return -ENOMEM; + + card->info.func_level = 0x4100 + chp_dsc->desc; + if (card->info.type == QETH_CARD_TYPE_IQD) + goto out; + + /* CHPP field bit 6 == 1 -> single queue */ + if ((chp_dsc->chpp & 0x02) == 0x02) + qeth_set_single_write_queues(card); + else + qeth_set_multiple_write_queues(card); +out: + kfree(chp_dsc); + QETH_DBF_TEXT_(SETUP, 2, "nr:%x", card->qdio.no_out_queues); + QETH_DBF_TEXT_(SETUP, 2, "lvl:%02x", card->info.func_level); + return 0; +} + +static void qeth_init_qdio_info(struct qeth_card *card) +{ + QETH_DBF_TEXT(SETUP, 4, "intqdinf"); + atomic_set(&card->qdio.state, QETH_QDIO_UNINITIALIZED); + card->qdio.do_prio_queueing = QETH_PRIOQ_DEFAULT; + card->qdio.default_out_queue = QETH_DEFAULT_QUEUE; + card->qdio.no_out_queues = QETH_MAX_QUEUES; + + /* inbound */ + card->qdio.no_in_queues = 1; + card->qdio.in_buf_size = QETH_IN_BUF_SIZE_DEFAULT; + if (card->info.type == QETH_CARD_TYPE_IQD) + card->qdio.init_pool.buf_count = QETH_IN_BUF_COUNT_HSDEFAULT; + else + card->qdio.init_pool.buf_count = QETH_IN_BUF_COUNT_DEFAULT; + card->qdio.in_buf_pool.buf_count = card->qdio.init_pool.buf_count; + INIT_LIST_HEAD(&card->qdio.in_buf_pool.entry_list); + INIT_LIST_HEAD(&card->qdio.init_pool.entry_list); +} + +static void qeth_set_initial_options(struct qeth_card *card) +{ + card->options.route4.type = NO_ROUTER; + card->options.route6.type = NO_ROUTER; + card->options.rx_sg_cb = QETH_RX_SG_CB; + card->options.isolation = ISOLATION_MODE_NONE; + card->options.cq = QETH_CQ_DISABLED; +} + +static int qeth_do_start_thread(struct qeth_card *card, unsigned long thread) +{ + unsigned long flags; + int rc = 0; + + spin_lock_irqsave(&card->thread_mask_lock, flags); + QETH_CARD_TEXT_(card, 4, " %02x%02x%02x", + (u8) card->thread_start_mask, + (u8) card->thread_allowed_mask, + (u8) card->thread_running_mask); + rc = (card->thread_start_mask & thread); + spin_unlock_irqrestore(&card->thread_mask_lock, flags); + return rc; +} + +static void qeth_start_kernel_thread(struct work_struct *work) +{ + struct task_struct *ts; + struct qeth_card *card = container_of(work, struct qeth_card, + kernel_thread_starter); + QETH_CARD_TEXT(card , 2, "strthrd"); + + if (card->read.state != CH_STATE_UP && + card->write.state != CH_STATE_UP) + return; + if (qeth_do_start_thread(card, QETH_RECOVER_THREAD)) { + ts = kthread_run(card->discipline->recover, (void *)card, + "qeth_recover"); + if (IS_ERR(ts)) { + qeth_clear_thread_start_bit(card, QETH_RECOVER_THREAD); + qeth_clear_thread_running_bit(card, + QETH_RECOVER_THREAD); + } + } +} + +static void qeth_buffer_reclaim_work(struct work_struct *); +static void qeth_setup_card(struct qeth_card *card) +{ + QETH_DBF_TEXT(SETUP, 2, "setupcrd"); + QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *)); + + card->info.type = CARD_RDEV(card)->id.driver_info; + card->state = CARD_STATE_DOWN; + spin_lock_init(&card->mclock); + spin_lock_init(&card->lock); + spin_lock_init(&card->ip_lock); + spin_lock_init(&card->thread_mask_lock); + mutex_init(&card->conf_mutex); + mutex_init(&card->discipline_mutex); + mutex_init(&card->vid_list_mutex); + INIT_WORK(&card->kernel_thread_starter, qeth_start_kernel_thread); + INIT_LIST_HEAD(&card->cmd_waiter_list); + init_waitqueue_head(&card->wait_q); + qeth_set_initial_options(card); + /* IP address takeover */ + INIT_LIST_HEAD(&card->ipato.entries); + qeth_init_qdio_info(card); + INIT_DELAYED_WORK(&card->buffer_reclaim_work, qeth_buffer_reclaim_work); + INIT_WORK(&card->close_dev_work, qeth_close_dev_handler); +} + +static void qeth_core_sl_print(struct seq_file *m, struct service_level *slr) +{ + struct qeth_card *card = container_of(slr, struct qeth_card, + qeth_service_level); + if (card->info.mcl_level[0]) + seq_printf(m, "qeth: %s firmware level %s\n", + CARD_BUS_ID(card), card->info.mcl_level); +} + +static struct qeth_card *qeth_alloc_card(struct ccwgroup_device *gdev) +{ + struct qeth_card *card; + + QETH_DBF_TEXT(SETUP, 2, "alloccrd"); + card = kzalloc(sizeof(*card), GFP_KERNEL); + if (!card) + goto out; + QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *)); + + card->gdev = gdev; + CARD_RDEV(card) = gdev->cdev[0]; + CARD_WDEV(card) = gdev->cdev[1]; + CARD_DDEV(card) = gdev->cdev[2]; + if (qeth_setup_channel(&card->read, true)) + goto out_ip; + if (qeth_setup_channel(&card->write, true)) + goto out_channel; + if (qeth_setup_channel(&card->data, false)) + goto out_data; + card->options.layer2 = -1; + card->qeth_service_level.seq_print = qeth_core_sl_print; + register_service_level(&card->qeth_service_level); + return card; + +out_data: + qeth_clean_channel(&card->write); +out_channel: + qeth_clean_channel(&card->read); +out_ip: + kfree(card); +out: + return NULL; +} + +static int qeth_clear_channel(struct qeth_channel *channel) +{ + unsigned long flags; + struct qeth_card *card; + int rc; + + card = CARD_FROM_CDEV(channel->ccwdev); + QETH_CARD_TEXT(card, 3, "clearch"); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + rc = ccw_device_clear(channel->ccwdev, QETH_CLEAR_CHANNEL_PARM); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + + if (rc) + return rc; + rc = wait_event_interruptible_timeout(card->wait_q, + channel->state == CH_STATE_STOPPED, QETH_TIMEOUT); + if (rc == -ERESTARTSYS) + return rc; + if (channel->state != CH_STATE_STOPPED) + return -ETIME; + channel->state = CH_STATE_DOWN; + return 0; +} + +static int qeth_halt_channel(struct qeth_channel *channel) +{ + unsigned long flags; + struct qeth_card *card; + int rc; + + card = CARD_FROM_CDEV(channel->ccwdev); + QETH_CARD_TEXT(card, 3, "haltch"); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + rc = ccw_device_halt(channel->ccwdev, QETH_HALT_CHANNEL_PARM); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + + if (rc) + return rc; + rc = wait_event_interruptible_timeout(card->wait_q, + channel->state == CH_STATE_HALTED, QETH_TIMEOUT); + if (rc == -ERESTARTSYS) + return rc; + if (channel->state != CH_STATE_HALTED) + return -ETIME; + return 0; +} + +static int qeth_halt_channels(struct qeth_card *card) +{ + int rc1 = 0, rc2 = 0, rc3 = 0; + + QETH_CARD_TEXT(card, 3, "haltchs"); + rc1 = qeth_halt_channel(&card->read); + rc2 = qeth_halt_channel(&card->write); + rc3 = qeth_halt_channel(&card->data); + if (rc1) + return rc1; + if (rc2) + return rc2; + return rc3; +} + +static int qeth_clear_channels(struct qeth_card *card) +{ + int rc1 = 0, rc2 = 0, rc3 = 0; + + QETH_CARD_TEXT(card, 3, "clearchs"); + rc1 = qeth_clear_channel(&card->read); + rc2 = qeth_clear_channel(&card->write); + rc3 = qeth_clear_channel(&card->data); + if (rc1) + return rc1; + if (rc2) + return rc2; + return rc3; +} + +static int qeth_clear_halt_card(struct qeth_card *card, int halt) +{ + int rc = 0; + + QETH_CARD_TEXT(card, 3, "clhacrd"); + + if (halt) + rc = qeth_halt_channels(card); + if (rc) + return rc; + return qeth_clear_channels(card); +} + +int qeth_qdio_clear_card(struct qeth_card *card, int use_halt) +{ + int rc = 0; + + QETH_CARD_TEXT(card, 3, "qdioclr"); + switch (atomic_cmpxchg(&card->qdio.state, QETH_QDIO_ESTABLISHED, + QETH_QDIO_CLEANING)) { + case QETH_QDIO_ESTABLISHED: + if (card->info.type == QETH_CARD_TYPE_IQD) + rc = qdio_shutdown(CARD_DDEV(card), + QDIO_FLAG_CLEANUP_USING_HALT); + else + rc = qdio_shutdown(CARD_DDEV(card), + QDIO_FLAG_CLEANUP_USING_CLEAR); + if (rc) + QETH_CARD_TEXT_(card, 3, "1err%d", rc); + atomic_set(&card->qdio.state, QETH_QDIO_ALLOCATED); + break; + case QETH_QDIO_CLEANING: + return rc; + default: + break; + } + rc = qeth_clear_halt_card(card, use_halt); + if (rc) + QETH_CARD_TEXT_(card, 3, "2err%d", rc); + card->state = CARD_STATE_DOWN; + return rc; +} +EXPORT_SYMBOL_GPL(qeth_qdio_clear_card); + +static int qeth_read_conf_data(struct qeth_card *card, void **buffer, + int *length) +{ + struct ciw *ciw; + char *rcd_buf; + int ret; + struct qeth_channel *channel = &card->data; + unsigned long flags; + + /* + * scan for RCD command in extended SenseID data + */ + ciw = ccw_device_get_ciw(channel->ccwdev, CIW_TYPE_RCD); + if (!ciw || ciw->cmd == 0) + return -EOPNOTSUPP; + rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA); + if (!rcd_buf) + return -ENOMEM; + + qeth_setup_ccw(channel->ccw, ciw->cmd, ciw->count, rcd_buf); + channel->state = CH_STATE_RCD; + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + ret = ccw_device_start_timeout(channel->ccwdev, channel->ccw, + QETH_RCD_PARM, LPM_ANYPATH, 0, + QETH_RCD_TIMEOUT); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + if (!ret) + wait_event(card->wait_q, + (channel->state == CH_STATE_RCD_DONE || + channel->state == CH_STATE_DOWN)); + if (channel->state == CH_STATE_DOWN) + ret = -EIO; + else + channel->state = CH_STATE_DOWN; + if (ret) { + kfree(rcd_buf); + *buffer = NULL; + *length = 0; + } else { + *length = ciw->count; + *buffer = rcd_buf; + } + return ret; +} + +static void qeth_configure_unitaddr(struct qeth_card *card, char *prcd) +{ + QETH_DBF_TEXT(SETUP, 2, "cfgunit"); + card->info.chpid = prcd[30]; + card->info.unit_addr2 = prcd[31]; + card->info.cula = prcd[63]; + card->info.guestlan = ((prcd[0x10] == _ascebc['V']) && + (prcd[0x11] == _ascebc['M'])); +} + +static enum qeth_discipline_id qeth_vm_detect_layer(struct qeth_card *card) +{ + enum qeth_discipline_id disc = QETH_DISCIPLINE_UNDETERMINED; + struct diag26c_vnic_resp *response = NULL; + struct diag26c_vnic_req *request = NULL; + struct ccw_dev_id id; + char userid[80]; + int rc = 0; + + QETH_DBF_TEXT(SETUP, 2, "vmlayer"); + + cpcmd("QUERY USERID", userid, sizeof(userid), &rc); + if (rc) + goto out; + + request = kzalloc(sizeof(*request), GFP_KERNEL | GFP_DMA); + response = kzalloc(sizeof(*response), GFP_KERNEL | GFP_DMA); + if (!request || !response) { + rc = -ENOMEM; + goto out; + } + + ccw_device_get_id(CARD_RDEV(card), &id); + request->resp_buf_len = sizeof(*response); + request->resp_version = DIAG26C_VERSION6_VM65918; + request->req_format = DIAG26C_VNIC_INFO; + ASCEBC(userid, 8); + memcpy(&request->sys_name, userid, 8); + request->devno = id.devno; + + QETH_DBF_HEX(CTRL, 2, request, sizeof(*request)); + rc = diag26c(request, response, DIAG26C_PORT_VNIC); + QETH_DBF_HEX(CTRL, 2, request, sizeof(*request)); + if (rc) + goto out; + QETH_DBF_HEX(CTRL, 2, response, sizeof(*response)); + + if (request->resp_buf_len < sizeof(*response) || + response->version != request->resp_version) { + rc = -EIO; + goto out; + } + + if (response->protocol == VNIC_INFO_PROT_L2) + disc = QETH_DISCIPLINE_LAYER2; + else if (response->protocol == VNIC_INFO_PROT_L3) + disc = QETH_DISCIPLINE_LAYER3; + +out: + kfree(response); + kfree(request); + if (rc) + QETH_DBF_TEXT_(SETUP, 2, "err%x", rc); + return disc; +} + +/* Determine whether the device requires a specific layer discipline */ +static enum qeth_discipline_id qeth_enforce_discipline(struct qeth_card *card) +{ + enum qeth_discipline_id disc = QETH_DISCIPLINE_UNDETERMINED; + + if (card->info.type == QETH_CARD_TYPE_OSM || + card->info.type == QETH_CARD_TYPE_OSN) + disc = QETH_DISCIPLINE_LAYER2; + else if (card->info.guestlan) + disc = (card->info.type == QETH_CARD_TYPE_IQD) ? + QETH_DISCIPLINE_LAYER3 : + qeth_vm_detect_layer(card); + + switch (disc) { + case QETH_DISCIPLINE_LAYER2: + QETH_DBF_TEXT(SETUP, 3, "force l2"); + break; + case QETH_DISCIPLINE_LAYER3: + QETH_DBF_TEXT(SETUP, 3, "force l3"); + break; + default: + QETH_DBF_TEXT(SETUP, 3, "force no"); + } + + return disc; +} + +static void qeth_configure_blkt_default(struct qeth_card *card, char *prcd) +{ + QETH_DBF_TEXT(SETUP, 2, "cfgblkt"); + + if (prcd[74] == 0xF0 && prcd[75] == 0xF0 && + prcd[76] >= 0xF1 && prcd[76] <= 0xF4) { + card->info.blkt.time_total = 0; + card->info.blkt.inter_packet = 0; + card->info.blkt.inter_packet_jumbo = 0; + } else { + card->info.blkt.time_total = 250; + card->info.blkt.inter_packet = 5; + card->info.blkt.inter_packet_jumbo = 15; + } +} + +static void qeth_init_tokens(struct qeth_card *card) +{ + card->token.issuer_rm_w = 0x00010103UL; + card->token.cm_filter_w = 0x00010108UL; + card->token.cm_connection_w = 0x0001010aUL; + card->token.ulp_filter_w = 0x0001010bUL; + card->token.ulp_connection_w = 0x0001010dUL; +} + +static void qeth_init_func_level(struct qeth_card *card) +{ + switch (card->info.type) { + case QETH_CARD_TYPE_IQD: + card->info.func_level = QETH_IDX_FUNC_LEVEL_IQD; + break; + case QETH_CARD_TYPE_OSD: + case QETH_CARD_TYPE_OSN: + card->info.func_level = QETH_IDX_FUNC_LEVEL_OSD; + break; + default: + break; + } +} + +static int qeth_idx_activate_get_answer(struct qeth_channel *channel, + void (*idx_reply_cb)(struct qeth_channel *, + struct qeth_cmd_buffer *)) +{ + struct qeth_cmd_buffer *iob; + unsigned long flags; + int rc; + struct qeth_card *card; + + QETH_DBF_TEXT(SETUP, 2, "idxanswr"); + card = CARD_FROM_CDEV(channel->ccwdev); + iob = qeth_get_buffer(channel); + if (!iob) + return -ENOMEM; + iob->callback = idx_reply_cb; + qeth_setup_ccw(channel->ccw, CCW_CMD_READ, QETH_BUFSIZE, iob->data); + + wait_event(card->wait_q, + atomic_cmpxchg(&channel->irq_pending, 0, 1) == 0); + QETH_DBF_TEXT(SETUP, 6, "noirqpnd"); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + rc = ccw_device_start_timeout(channel->ccwdev, channel->ccw, + (addr_t) iob, 0, 0, QETH_TIMEOUT); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + + if (rc) { + QETH_DBF_MESSAGE(2, "Error2 in activating channel rc=%d\n", rc); + QETH_DBF_TEXT_(SETUP, 2, "2err%d", rc); + atomic_set(&channel->irq_pending, 0); + qeth_release_buffer(channel, iob); + wake_up(&card->wait_q); + return rc; + } + rc = wait_event_interruptible_timeout(card->wait_q, + channel->state == CH_STATE_UP, QETH_TIMEOUT); + if (rc == -ERESTARTSYS) + return rc; + if (channel->state != CH_STATE_UP) { + rc = -ETIME; + QETH_DBF_TEXT_(SETUP, 2, "3err%d", rc); + } else + rc = 0; + return rc; +} + +static int qeth_idx_activate_channel(struct qeth_channel *channel, + void (*idx_reply_cb)(struct qeth_channel *, + struct qeth_cmd_buffer *)) +{ + struct qeth_card *card; + struct qeth_cmd_buffer *iob; + unsigned long flags; + __u16 temp; + __u8 tmp; + int rc; + struct ccw_dev_id temp_devid; + + card = CARD_FROM_CDEV(channel->ccwdev); + + QETH_DBF_TEXT(SETUP, 2, "idxactch"); + + iob = qeth_get_buffer(channel); + if (!iob) + return -ENOMEM; + iob->callback = idx_reply_cb; + qeth_setup_ccw(channel->ccw, CCW_CMD_WRITE, IDX_ACTIVATE_SIZE, + iob->data); + if (channel == &card->write) { + memcpy(iob->data, IDX_ACTIVATE_WRITE, IDX_ACTIVATE_SIZE); + memcpy(QETH_TRANSPORT_HEADER_SEQ_NO(iob->data), + &card->seqno.trans_hdr, QETH_SEQ_NO_LENGTH); + card->seqno.trans_hdr++; + } else { + memcpy(iob->data, IDX_ACTIVATE_READ, IDX_ACTIVATE_SIZE); + memcpy(QETH_TRANSPORT_HEADER_SEQ_NO(iob->data), + &card->seqno.trans_hdr, QETH_SEQ_NO_LENGTH); + } + tmp = ((u8)card->dev->dev_port) | 0x80; + memcpy(QETH_IDX_ACT_PNO(iob->data), &tmp, 1); + memcpy(QETH_IDX_ACT_ISSUER_RM_TOKEN(iob->data), + &card->token.issuer_rm_w, QETH_MPC_TOKEN_LENGTH); + memcpy(QETH_IDX_ACT_FUNC_LEVEL(iob->data), + &card->info.func_level, sizeof(__u16)); + ccw_device_get_id(CARD_DDEV(card), &temp_devid); + memcpy(QETH_IDX_ACT_QDIO_DEV_CUA(iob->data), &temp_devid.devno, 2); + temp = (card->info.cula << 8) + card->info.unit_addr2; + memcpy(QETH_IDX_ACT_QDIO_DEV_REALADDR(iob->data), &temp, 2); + + wait_event(card->wait_q, + atomic_cmpxchg(&channel->irq_pending, 0, 1) == 0); + QETH_DBF_TEXT(SETUP, 6, "noirqpnd"); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + rc = ccw_device_start_timeout(channel->ccwdev, channel->ccw, + (addr_t) iob, 0, 0, QETH_TIMEOUT); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + + if (rc) { + QETH_DBF_MESSAGE(2, "Error1 in activating channel. rc=%d\n", + rc); + QETH_DBF_TEXT_(SETUP, 2, "1err%d", rc); + atomic_set(&channel->irq_pending, 0); + qeth_release_buffer(channel, iob); + wake_up(&card->wait_q); + return rc; + } + rc = wait_event_interruptible_timeout(card->wait_q, + channel->state == CH_STATE_ACTIVATING, QETH_TIMEOUT); + if (rc == -ERESTARTSYS) + return rc; + if (channel->state != CH_STATE_ACTIVATING) { + dev_warn(&channel->ccwdev->dev, "The qeth device driver" + " failed to recover an error on the device\n"); + QETH_DBF_MESSAGE(2, "%s IDX activate timed out\n", + dev_name(&channel->ccwdev->dev)); + QETH_DBF_TEXT_(SETUP, 2, "2err%d", -ETIME); + return -ETIME; + } + return qeth_idx_activate_get_answer(channel, idx_reply_cb); +} + +static int qeth_peer_func_level(int level) +{ + if ((level & 0xff) == 8) + return (level & 0xff) + 0x400; + if (((level >> 8) & 3) == 1) + return (level & 0xff) + 0x200; + return level; +} + +static void qeth_idx_write_cb(struct qeth_channel *channel, + struct qeth_cmd_buffer *iob) +{ + struct qeth_card *card; + __u16 temp; + + QETH_DBF_TEXT(SETUP , 2, "idxwrcb"); + + if (channel->state == CH_STATE_DOWN) { + channel->state = CH_STATE_ACTIVATING; + goto out; + } + card = CARD_FROM_CDEV(channel->ccwdev); + + if (!(QETH_IS_IDX_ACT_POS_REPLY(iob->data))) { + if (QETH_IDX_ACT_CAUSE_CODE(iob->data) == QETH_IDX_ACT_ERR_EXCL) + dev_err(&channel->ccwdev->dev, + "The adapter is used exclusively by another " + "host\n"); + else + QETH_DBF_MESSAGE(2, "%s IDX_ACTIVATE on write channel:" + " negative reply\n", + dev_name(&channel->ccwdev->dev)); + goto out; + } + memcpy(&temp, QETH_IDX_ACT_FUNC_LEVEL(iob->data), 2); + if ((temp & ~0x0100) != qeth_peer_func_level(card->info.func_level)) { + QETH_DBF_MESSAGE(2, "%s IDX_ACTIVATE on write channel: " + "function level mismatch (sent: 0x%x, received: " + "0x%x)\n", dev_name(&channel->ccwdev->dev), + card->info.func_level, temp); + goto out; + } + channel->state = CH_STATE_UP; +out: + qeth_release_buffer(channel, iob); +} + +static void qeth_idx_read_cb(struct qeth_channel *channel, + struct qeth_cmd_buffer *iob) +{ + struct qeth_card *card; + __u16 temp; + + QETH_DBF_TEXT(SETUP , 2, "idxrdcb"); + if (channel->state == CH_STATE_DOWN) { + channel->state = CH_STATE_ACTIVATING; + goto out; + } + + card = CARD_FROM_CDEV(channel->ccwdev); + if (qeth_check_idx_response(card, iob->data)) + goto out; + + if (!(QETH_IS_IDX_ACT_POS_REPLY(iob->data))) { + switch (QETH_IDX_ACT_CAUSE_CODE(iob->data)) { + case QETH_IDX_ACT_ERR_EXCL: + dev_err(&channel->ccwdev->dev, + "The adapter is used exclusively by another " + "host\n"); + break; + case QETH_IDX_ACT_ERR_AUTH: + case QETH_IDX_ACT_ERR_AUTH_USER: + dev_err(&channel->ccwdev->dev, + "Setting the device online failed because of " + "insufficient authorization\n"); + break; + default: + QETH_DBF_MESSAGE(2, "%s IDX_ACTIVATE on read channel:" + " negative reply\n", + dev_name(&channel->ccwdev->dev)); + } + QETH_CARD_TEXT_(card, 2, "idxread%c", + QETH_IDX_ACT_CAUSE_CODE(iob->data)); + goto out; + } + + memcpy(&temp, QETH_IDX_ACT_FUNC_LEVEL(iob->data), 2); + if (temp != qeth_peer_func_level(card->info.func_level)) { + QETH_DBF_MESSAGE(2, "%s IDX_ACTIVATE on read channel: function " + "level mismatch (sent: 0x%x, received: 0x%x)\n", + dev_name(&channel->ccwdev->dev), + card->info.func_level, temp); + goto out; + } + memcpy(&card->token.issuer_rm_r, + QETH_IDX_ACT_ISSUER_RM_TOKEN(iob->data), + QETH_MPC_TOKEN_LENGTH); + memcpy(&card->info.mcl_level[0], + QETH_IDX_REPLY_LEVEL(iob->data), QETH_MCL_LENGTH); + channel->state = CH_STATE_UP; +out: + qeth_release_buffer(channel, iob); +} + +void qeth_prepare_control_data(struct qeth_card *card, int len, + struct qeth_cmd_buffer *iob) +{ + qeth_setup_ccw(iob->channel->ccw, CCW_CMD_WRITE, len, iob->data); + iob->callback = qeth_release_buffer; + + memcpy(QETH_TRANSPORT_HEADER_SEQ_NO(iob->data), + &card->seqno.trans_hdr, QETH_SEQ_NO_LENGTH); + card->seqno.trans_hdr++; + memcpy(QETH_PDU_HEADER_SEQ_NO(iob->data), + &card->seqno.pdu_hdr, QETH_SEQ_NO_LENGTH); + card->seqno.pdu_hdr++; + memcpy(QETH_PDU_HEADER_ACK_SEQ_NO(iob->data), + &card->seqno.pdu_hdr_ack, QETH_SEQ_NO_LENGTH); + QETH_DBF_HEX(CTRL, 2, iob->data, QETH_DBF_CTRL_LEN); +} +EXPORT_SYMBOL_GPL(qeth_prepare_control_data); + +/** + * qeth_send_control_data() - send control command to the card + * @card: qeth_card structure pointer + * @len: size of the command buffer + * @iob: qeth_cmd_buffer pointer + * @reply_cb: callback function pointer + * @cb_card: pointer to the qeth_card structure + * @cb_reply: pointer to the qeth_reply structure + * @cb_cmd: pointer to the original iob for non-IPA + * commands, or to the qeth_ipa_cmd structure + * for the IPA commands. + * @reply_param: private pointer passed to the callback + * + * Returns the value of the `return_code' field of the response + * block returned from the hardware, or other error indication. + * Value of zero indicates successful execution of the command. + * + * Callback function gets called one or more times, with cb_cmd + * pointing to the response returned by the hardware. Callback + * function must return non-zero if more reply blocks are expected, + * and zero if the last or only reply block is received. Callback + * function can get the value of the reply_param pointer from the + * field 'param' of the structure qeth_reply. + */ + +int qeth_send_control_data(struct qeth_card *card, int len, + struct qeth_cmd_buffer *iob, + int (*reply_cb)(struct qeth_card *cb_card, + struct qeth_reply *cb_reply, + unsigned long cb_cmd), + void *reply_param) +{ + struct qeth_channel *channel = iob->channel; + int rc; + unsigned long flags; + struct qeth_reply *reply = NULL; + unsigned long timeout, event_timeout; + struct qeth_ipa_cmd *cmd = NULL; + + QETH_CARD_TEXT(card, 2, "sendctl"); + + if (card->read_or_write_problem) { + qeth_release_buffer(channel, iob); + return -EIO; + } + reply = qeth_alloc_reply(card); + if (!reply) { + qeth_release_buffer(channel, iob); + return -ENOMEM; + } + reply->callback = reply_cb; + reply->param = reply_param; + + init_waitqueue_head(&reply->wait_q); + + while (atomic_cmpxchg(&channel->irq_pending, 0, 1)) ; + + if (IS_IPA(iob->data)) { + cmd = __ipa_cmd(iob); + cmd->hdr.seqno = card->seqno.ipa++; + reply->seqno = cmd->hdr.seqno; + event_timeout = QETH_IPA_TIMEOUT; + } else { + reply->seqno = QETH_IDX_COMMAND_SEQNO; + event_timeout = QETH_TIMEOUT; + } + qeth_prepare_control_data(card, len, iob); + + spin_lock_irqsave(&card->lock, flags); + list_add_tail(&reply->list, &card->cmd_waiter_list); + spin_unlock_irqrestore(&card->lock, flags); + + timeout = jiffies + event_timeout; + + QETH_CARD_TEXT(card, 6, "noirqpnd"); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + rc = ccw_device_start_timeout(channel->ccwdev, channel->ccw, + (addr_t) iob, 0, 0, event_timeout); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + if (rc) { + QETH_DBF_MESSAGE(2, "%s qeth_send_control_data: " + "ccw_device_start rc = %i\n", + dev_name(&channel->ccwdev->dev), rc); + QETH_CARD_TEXT_(card, 2, " err%d", rc); + spin_lock_irqsave(&card->lock, flags); + list_del_init(&reply->list); + qeth_put_reply(reply); + spin_unlock_irqrestore(&card->lock, flags); + qeth_release_buffer(channel, iob); + atomic_set(&channel->irq_pending, 0); + wake_up(&card->wait_q); + return rc; + } + + /* we have only one long running ipassist, since we can ensure + process context of this command we can sleep */ + if (cmd && cmd->hdr.command == IPA_CMD_SETIP && + cmd->hdr.prot_version == QETH_PROT_IPV4) { + if (!wait_event_timeout(reply->wait_q, + atomic_read(&reply->received), event_timeout)) + goto time_err; + } else { + while (!atomic_read(&reply->received)) { + if (time_after(jiffies, timeout)) + goto time_err; + cpu_relax(); + } + } + + rc = reply->rc; + qeth_put_reply(reply); + return rc; + +time_err: + reply->rc = -ETIME; + spin_lock_irqsave(&reply->card->lock, flags); + list_del_init(&reply->list); + spin_unlock_irqrestore(&reply->card->lock, flags); + atomic_inc(&reply->received); + rc = reply->rc; + qeth_put_reply(reply); + return rc; +} +EXPORT_SYMBOL_GPL(qeth_send_control_data); + +static int qeth_cm_enable_cb(struct qeth_card *card, struct qeth_reply *reply, + unsigned long data) +{ + struct qeth_cmd_buffer *iob; + + QETH_DBF_TEXT(SETUP, 2, "cmenblcb"); + + iob = (struct qeth_cmd_buffer *) data; + memcpy(&card->token.cm_filter_r, + QETH_CM_ENABLE_RESP_FILTER_TOKEN(iob->data), + QETH_MPC_TOKEN_LENGTH); + QETH_DBF_TEXT_(SETUP, 2, " rc%d", iob->rc); + return 0; +} + +static int qeth_cm_enable(struct qeth_card *card) +{ + int rc; + struct qeth_cmd_buffer *iob; + + QETH_DBF_TEXT(SETUP, 2, "cmenable"); + + iob = qeth_wait_for_buffer(&card->write); + memcpy(iob->data, CM_ENABLE, CM_ENABLE_SIZE); + memcpy(QETH_CM_ENABLE_ISSUER_RM_TOKEN(iob->data), + &card->token.issuer_rm_r, QETH_MPC_TOKEN_LENGTH); + memcpy(QETH_CM_ENABLE_FILTER_TOKEN(iob->data), + &card->token.cm_filter_w, QETH_MPC_TOKEN_LENGTH); + + rc = qeth_send_control_data(card, CM_ENABLE_SIZE, iob, + qeth_cm_enable_cb, NULL); + return rc; +} + +static int qeth_cm_setup_cb(struct qeth_card *card, struct qeth_reply *reply, + unsigned long data) +{ + + struct qeth_cmd_buffer *iob; + + QETH_DBF_TEXT(SETUP, 2, "cmsetpcb"); + + iob = (struct qeth_cmd_buffer *) data; + memcpy(&card->token.cm_connection_r, + QETH_CM_SETUP_RESP_DEST_ADDR(iob->data), + QETH_MPC_TOKEN_LENGTH); + QETH_DBF_TEXT_(SETUP, 2, " rc%d", iob->rc); + return 0; +} + +static int qeth_cm_setup(struct qeth_card *card) +{ + int rc; + struct qeth_cmd_buffer *iob; + + QETH_DBF_TEXT(SETUP, 2, "cmsetup"); + + iob = qeth_wait_for_buffer(&card->write); + memcpy(iob->data, CM_SETUP, CM_SETUP_SIZE); + memcpy(QETH_CM_SETUP_DEST_ADDR(iob->data), + &card->token.issuer_rm_r, QETH_MPC_TOKEN_LENGTH); + memcpy(QETH_CM_SETUP_CONNECTION_TOKEN(iob->data), + &card->token.cm_connection_w, QETH_MPC_TOKEN_LENGTH); + memcpy(QETH_CM_SETUP_FILTER_TOKEN(iob->data), + &card->token.cm_filter_r, QETH_MPC_TOKEN_LENGTH); + rc = qeth_send_control_data(card, CM_SETUP_SIZE, iob, + qeth_cm_setup_cb, NULL); + return rc; + +} + +static int qeth_update_max_mtu(struct qeth_card *card, unsigned int max_mtu) +{ + struct net_device *dev = card->dev; + unsigned int new_mtu; + + if (!max_mtu) { + /* IQD needs accurate max MTU to set up its RX buffers: */ + if (IS_IQD(card)) + return -EINVAL; + /* tolerate quirky HW: */ + max_mtu = ETH_MAX_MTU; + } + + rtnl_lock(); + if (IS_IQD(card)) { + /* move any device with default MTU to new max MTU: */ + new_mtu = (dev->mtu == dev->max_mtu) ? max_mtu : dev->mtu; + + /* adjust RX buffer size to new max MTU: */ + card->qdio.in_buf_size = max_mtu + 2 * PAGE_SIZE; + if (dev->max_mtu && dev->max_mtu != max_mtu) + qeth_free_qdio_buffers(card); + } else { + if (dev->mtu) + new_mtu = dev->mtu; + /* default MTUs for first setup: */ + else if (card->options.layer2) + new_mtu = ETH_DATA_LEN; + else + new_mtu = ETH_DATA_LEN - 8; /* allow for LLC + SNAP */ + } + + dev->max_mtu = max_mtu; + dev->mtu = min(new_mtu, max_mtu); + rtnl_unlock(); + return 0; +} + +static int qeth_get_mtu_outof_framesize(int framesize) +{ + switch (framesize) { + case 0x4000: + return 8192; + case 0x6000: + return 16384; + case 0xa000: + return 32768; + case 0xffff: + return 57344; + default: + return 0; + } +} + +static int qeth_ulp_enable_cb(struct qeth_card *card, struct qeth_reply *reply, + unsigned long data) +{ + + __u16 mtu, framesize; + __u16 len; + __u8 link_type; + struct qeth_cmd_buffer *iob; + + QETH_DBF_TEXT(SETUP, 2, "ulpenacb"); + + iob = (struct qeth_cmd_buffer *) data; + memcpy(&card->token.ulp_filter_r, + QETH_ULP_ENABLE_RESP_FILTER_TOKEN(iob->data), + QETH_MPC_TOKEN_LENGTH); + if (card->info.type == QETH_CARD_TYPE_IQD) { + memcpy(&framesize, QETH_ULP_ENABLE_RESP_MAX_MTU(iob->data), 2); + mtu = qeth_get_mtu_outof_framesize(framesize); + } else { + mtu = *(__u16 *)QETH_ULP_ENABLE_RESP_MAX_MTU(iob->data); + } + *(u16 *)reply->param = mtu; + + memcpy(&len, QETH_ULP_ENABLE_RESP_DIFINFO_LEN(iob->data), 2); + if (len >= QETH_MPC_DIFINFO_LEN_INDICATES_LINK_TYPE) { + memcpy(&link_type, + QETH_ULP_ENABLE_RESP_LINK_TYPE(iob->data), 1); + card->info.link_type = link_type; + } else + card->info.link_type = 0; + QETH_DBF_TEXT_(SETUP, 2, "link%d", card->info.link_type); + QETH_DBF_TEXT_(SETUP, 2, " rc%d", iob->rc); + return 0; +} + +static u8 qeth_mpc_select_prot_type(struct qeth_card *card) +{ + if (IS_OSN(card)) + return QETH_PROT_OSN2; + return (card->options.layer2 == 1) ? QETH_PROT_LAYER2 : QETH_PROT_TCPIP; +} + +static int qeth_ulp_enable(struct qeth_card *card) +{ + u8 prot_type = qeth_mpc_select_prot_type(card); + struct qeth_cmd_buffer *iob; + u16 max_mtu; + int rc; + + /*FIXME: trace view callbacks*/ + QETH_DBF_TEXT(SETUP, 2, "ulpenabl"); + + iob = qeth_wait_for_buffer(&card->write); + memcpy(iob->data, ULP_ENABLE, ULP_ENABLE_SIZE); + + *(QETH_ULP_ENABLE_LINKNUM(iob->data)) = (u8) card->dev->dev_port; + memcpy(QETH_ULP_ENABLE_PROT_TYPE(iob->data), &prot_type, 1); + memcpy(QETH_ULP_ENABLE_DEST_ADDR(iob->data), + &card->token.cm_connection_r, QETH_MPC_TOKEN_LENGTH); + memcpy(QETH_ULP_ENABLE_FILTER_TOKEN(iob->data), + &card->token.ulp_filter_w, QETH_MPC_TOKEN_LENGTH); + rc = qeth_send_control_data(card, ULP_ENABLE_SIZE, iob, + qeth_ulp_enable_cb, &max_mtu); + if (rc) + return rc; + return qeth_update_max_mtu(card, max_mtu); +} + +static int qeth_ulp_setup_cb(struct qeth_card *card, struct qeth_reply *reply, + unsigned long data) +{ + struct qeth_cmd_buffer *iob; + + QETH_DBF_TEXT(SETUP, 2, "ulpstpcb"); + + iob = (struct qeth_cmd_buffer *) data; + memcpy(&card->token.ulp_connection_r, + QETH_ULP_SETUP_RESP_CONNECTION_TOKEN(iob->data), + QETH_MPC_TOKEN_LENGTH); + if (!strncmp("00S", QETH_ULP_SETUP_RESP_CONNECTION_TOKEN(iob->data), + 3)) { + QETH_DBF_TEXT(SETUP, 2, "olmlimit"); + dev_err(&card->gdev->dev, "A connection could not be " + "established because of an OLM limit\n"); + iob->rc = -EMLINK; + } + QETH_DBF_TEXT_(SETUP, 2, " rc%d", iob->rc); + return 0; +} + +static int qeth_ulp_setup(struct qeth_card *card) +{ + int rc; + __u16 temp; + struct qeth_cmd_buffer *iob; + struct ccw_dev_id dev_id; + + QETH_DBF_TEXT(SETUP, 2, "ulpsetup"); + + iob = qeth_wait_for_buffer(&card->write); + memcpy(iob->data, ULP_SETUP, ULP_SETUP_SIZE); + + memcpy(QETH_ULP_SETUP_DEST_ADDR(iob->data), + &card->token.cm_connection_r, QETH_MPC_TOKEN_LENGTH); + memcpy(QETH_ULP_SETUP_CONNECTION_TOKEN(iob->data), + &card->token.ulp_connection_w, QETH_MPC_TOKEN_LENGTH); + memcpy(QETH_ULP_SETUP_FILTER_TOKEN(iob->data), + &card->token.ulp_filter_r, QETH_MPC_TOKEN_LENGTH); + + ccw_device_get_id(CARD_DDEV(card), &dev_id); + memcpy(QETH_ULP_SETUP_CUA(iob->data), &dev_id.devno, 2); + temp = (card->info.cula << 8) + card->info.unit_addr2; + memcpy(QETH_ULP_SETUP_REAL_DEVADDR(iob->data), &temp, 2); + rc = qeth_send_control_data(card, ULP_SETUP_SIZE, iob, + qeth_ulp_setup_cb, NULL); + return rc; +} + +static int qeth_init_qdio_out_buf(struct qeth_qdio_out_q *q, int bidx) +{ + struct qeth_qdio_out_buffer *newbuf; + + newbuf = kmem_cache_zalloc(qeth_qdio_outbuf_cache, GFP_ATOMIC); + if (!newbuf) + return -ENOMEM; + + newbuf->buffer = q->qdio_bufs[bidx]; + skb_queue_head_init(&newbuf->skb_list); + lockdep_set_class(&newbuf->skb_list.lock, &qdio_out_skb_queue_key); + newbuf->q = q; + newbuf->next_pending = q->bufs[bidx]; + atomic_set(&newbuf->state, QETH_QDIO_BUF_EMPTY); + q->bufs[bidx] = newbuf; + return 0; +} + +static void qeth_free_output_queue(struct qeth_qdio_out_q *q) +{ + if (!q) + return; + + qeth_clear_outq_buffers(q, 1); + qdio_free_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q); + kfree(q); +} + +static struct qeth_qdio_out_q *qeth_alloc_qdio_out_buf(void) +{ + struct qeth_qdio_out_q *q = kzalloc(sizeof(*q), GFP_KERNEL); + + if (!q) + return NULL; + + if (qdio_alloc_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q)) { + kfree(q); + return NULL; + } + return q; +} + +static int qeth_alloc_qdio_buffers(struct qeth_card *card) +{ + int i, j; + + QETH_DBF_TEXT(SETUP, 2, "allcqdbf"); + + if (atomic_cmpxchg(&card->qdio.state, QETH_QDIO_UNINITIALIZED, + QETH_QDIO_ALLOCATED) != QETH_QDIO_UNINITIALIZED) + return 0; + + QETH_DBF_TEXT(SETUP, 2, "inq"); + card->qdio.in_q = qeth_alloc_qdio_queue(); + if (!card->qdio.in_q) + goto out_nomem; + + /* inbound buffer pool */ + if (qeth_alloc_buffer_pool(card)) + goto out_freeinq; + + /* outbound */ + card->qdio.out_qs = + kcalloc(card->qdio.no_out_queues, + sizeof(struct qeth_qdio_out_q *), + GFP_KERNEL); + if (!card->qdio.out_qs) + goto out_freepool; + for (i = 0; i < card->qdio.no_out_queues; ++i) { + card->qdio.out_qs[i] = qeth_alloc_qdio_out_buf(); + if (!card->qdio.out_qs[i]) + goto out_freeoutq; + QETH_DBF_TEXT_(SETUP, 2, "outq %i", i); + QETH_DBF_HEX(SETUP, 2, &card->qdio.out_qs[i], sizeof(void *)); + card->qdio.out_qs[i]->queue_no = i; + /* give outbound qeth_qdio_buffers their qdio_buffers */ + for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) { + WARN_ON(card->qdio.out_qs[i]->bufs[j] != NULL); + if (qeth_init_qdio_out_buf(card->qdio.out_qs[i], j)) + goto out_freeoutqbufs; + } + } + + /* completion */ + if (qeth_alloc_cq(card)) + goto out_freeoutq; + + return 0; + +out_freeoutqbufs: + while (j > 0) { + --j; + kmem_cache_free(qeth_qdio_outbuf_cache, + card->qdio.out_qs[i]->bufs[j]); + card->qdio.out_qs[i]->bufs[j] = NULL; + } +out_freeoutq: + while (i > 0) + qeth_free_output_queue(card->qdio.out_qs[--i]); + kfree(card->qdio.out_qs); + card->qdio.out_qs = NULL; +out_freepool: + qeth_free_buffer_pool(card); +out_freeinq: + qeth_free_qdio_queue(card->qdio.in_q); + card->qdio.in_q = NULL; +out_nomem: + atomic_set(&card->qdio.state, QETH_QDIO_UNINITIALIZED); + return -ENOMEM; +} + +static void qeth_free_qdio_buffers(struct qeth_card *card) +{ + int i, j; + + if (atomic_xchg(&card->qdio.state, QETH_QDIO_UNINITIALIZED) == + QETH_QDIO_UNINITIALIZED) + return; + + qeth_free_cq(card); + cancel_delayed_work_sync(&card->buffer_reclaim_work); + for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) { + if (card->qdio.in_q->bufs[j].rx_skb) + dev_kfree_skb_any(card->qdio.in_q->bufs[j].rx_skb); + } + qeth_free_qdio_queue(card->qdio.in_q); + card->qdio.in_q = NULL; + /* inbound buffer pool */ + qeth_free_buffer_pool(card); + /* free outbound qdio_qs */ + if (card->qdio.out_qs) { + for (i = 0; i < card->qdio.no_out_queues; i++) + qeth_free_output_queue(card->qdio.out_qs[i]); + kfree(card->qdio.out_qs); + card->qdio.out_qs = NULL; + } +} + +static void qeth_create_qib_param_field(struct qeth_card *card, + char *param_field) +{ + + param_field[0] = _ascebc['P']; + param_field[1] = _ascebc['C']; + param_field[2] = _ascebc['I']; + param_field[3] = _ascebc['T']; + *((unsigned int *) (¶m_field[4])) = QETH_PCI_THRESHOLD_A(card); + *((unsigned int *) (¶m_field[8])) = QETH_PCI_THRESHOLD_B(card); + *((unsigned int *) (¶m_field[12])) = QETH_PCI_TIMER_VALUE(card); +} + +static void qeth_create_qib_param_field_blkt(struct qeth_card *card, + char *param_field) +{ + param_field[16] = _ascebc['B']; + param_field[17] = _ascebc['L']; + param_field[18] = _ascebc['K']; + param_field[19] = _ascebc['T']; + *((unsigned int *) (¶m_field[20])) = card->info.blkt.time_total; + *((unsigned int *) (¶m_field[24])) = card->info.blkt.inter_packet; + *((unsigned int *) (¶m_field[28])) = + card->info.blkt.inter_packet_jumbo; +} + +static int qeth_qdio_activate(struct qeth_card *card) +{ + QETH_DBF_TEXT(SETUP, 3, "qdioact"); + return qdio_activate(CARD_DDEV(card)); +} + +static int qeth_dm_act(struct qeth_card *card) +{ + int rc; + struct qeth_cmd_buffer *iob; + + QETH_DBF_TEXT(SETUP, 2, "dmact"); + + iob = qeth_wait_for_buffer(&card->write); + memcpy(iob->data, DM_ACT, DM_ACT_SIZE); + + memcpy(QETH_DM_ACT_DEST_ADDR(iob->data), + &card->token.cm_connection_r, QETH_MPC_TOKEN_LENGTH); + memcpy(QETH_DM_ACT_CONNECTION_TOKEN(iob->data), + &card->token.ulp_connection_r, QETH_MPC_TOKEN_LENGTH); + rc = qeth_send_control_data(card, DM_ACT_SIZE, iob, NULL, NULL); + return rc; +} + +static int qeth_mpc_initialize(struct qeth_card *card) +{ + int rc; + + QETH_DBF_TEXT(SETUP, 2, "mpcinit"); + + rc = qeth_issue_next_read(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "1err%d", rc); + return rc; + } + rc = qeth_cm_enable(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "2err%d", rc); + goto out_qdio; + } + rc = qeth_cm_setup(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "3err%d", rc); + goto out_qdio; + } + rc = qeth_ulp_enable(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "4err%d", rc); + goto out_qdio; + } + rc = qeth_ulp_setup(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "5err%d", rc); + goto out_qdio; + } + rc = qeth_alloc_qdio_buffers(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "5err%d", rc); + goto out_qdio; + } + rc = qeth_qdio_establish(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "6err%d", rc); + qeth_free_qdio_buffers(card); + goto out_qdio; + } + rc = qeth_qdio_activate(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "7err%d", rc); + goto out_qdio; + } + rc = qeth_dm_act(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "8err%d", rc); + goto out_qdio; + } + + return 0; +out_qdio: + qeth_qdio_clear_card(card, card->info.type != QETH_CARD_TYPE_IQD); + qdio_free(CARD_DDEV(card)); + return rc; +} + +void qeth_print_status_message(struct qeth_card *card) +{ + switch (card->info.type) { + case QETH_CARD_TYPE_OSD: + case QETH_CARD_TYPE_OSM: + case QETH_CARD_TYPE_OSX: + /* VM will use a non-zero first character + * to indicate a HiperSockets like reporting + * of the level OSA sets the first character to zero + * */ + if (!card->info.mcl_level[0]) { + sprintf(card->info.mcl_level, "%02x%02x", + card->info.mcl_level[2], + card->info.mcl_level[3]); + break; + } + /* fallthrough */ + case QETH_CARD_TYPE_IQD: + if ((card->info.guestlan) || + (card->info.mcl_level[0] & 0x80)) { + card->info.mcl_level[0] = (char) _ebcasc[(__u8) + card->info.mcl_level[0]]; + card->info.mcl_level[1] = (char) _ebcasc[(__u8) + card->info.mcl_level[1]]; + card->info.mcl_level[2] = (char) _ebcasc[(__u8) + card->info.mcl_level[2]]; + card->info.mcl_level[3] = (char) _ebcasc[(__u8) + card->info.mcl_level[3]]; + card->info.mcl_level[QETH_MCL_LENGTH] = 0; + } + break; + default: + memset(&card->info.mcl_level[0], 0, QETH_MCL_LENGTH + 1); + } + dev_info(&card->gdev->dev, + "Device is a%s card%s%s%s\nwith link type %s.\n", + qeth_get_cardname(card), + (card->info.mcl_level[0]) ? " (level: " : "", + (card->info.mcl_level[0]) ? card->info.mcl_level : "", + (card->info.mcl_level[0]) ? ")" : "", + qeth_get_cardname_short(card)); +} +EXPORT_SYMBOL_GPL(qeth_print_status_message); + +static void qeth_initialize_working_pool_list(struct qeth_card *card) +{ + struct qeth_buffer_pool_entry *entry; + + QETH_CARD_TEXT(card, 5, "inwrklst"); + + list_for_each_entry(entry, + &card->qdio.init_pool.entry_list, init_list) { + qeth_put_buffer_pool_entry(card, entry); + } +} + +static struct qeth_buffer_pool_entry *qeth_find_free_buffer_pool_entry( + struct qeth_card *card) +{ + struct list_head *plh; + struct qeth_buffer_pool_entry *entry; + int i, free; + struct page *page; + + if (list_empty(&card->qdio.in_buf_pool.entry_list)) + return NULL; + + list_for_each(plh, &card->qdio.in_buf_pool.entry_list) { + entry = list_entry(plh, struct qeth_buffer_pool_entry, list); + free = 1; + for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) { + if (page_count(virt_to_page(entry->elements[i])) > 1) { + free = 0; + break; + } + } + if (free) { + list_del_init(&entry->list); + return entry; + } + } + + /* no free buffer in pool so take first one and swap pages */ + entry = list_entry(card->qdio.in_buf_pool.entry_list.next, + struct qeth_buffer_pool_entry, list); + for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) { + if (page_count(virt_to_page(entry->elements[i])) > 1) { + page = alloc_page(GFP_ATOMIC); + if (!page) { + return NULL; + } else { + free_page((unsigned long)entry->elements[i]); + entry->elements[i] = page_address(page); + if (card->options.performance_stats) + card->perf_stats.sg_alloc_page_rx++; + } + } + } + list_del_init(&entry->list); + return entry; +} + +static int qeth_init_input_buffer(struct qeth_card *card, + struct qeth_qdio_buffer *buf) +{ + struct qeth_buffer_pool_entry *pool_entry; + int i; + + if ((card->options.cq == QETH_CQ_ENABLED) && (!buf->rx_skb)) { + buf->rx_skb = netdev_alloc_skb(card->dev, + QETH_RX_PULL_LEN + ETH_HLEN); + if (!buf->rx_skb) + return -ENOMEM; + } + + pool_entry = qeth_find_free_buffer_pool_entry(card); + if (!pool_entry) + return -ENOBUFS; + + /* + * since the buffer is accessed only from the input_tasklet + * there shouldn't be a need to synchronize; also, since we use + * the QETH_IN_BUF_REQUEUE_THRESHOLD we should never run out off + * buffers + */ + + buf->pool_entry = pool_entry; + for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) { + buf->buffer->element[i].length = PAGE_SIZE; + buf->buffer->element[i].addr = pool_entry->elements[i]; + if (i == QETH_MAX_BUFFER_ELEMENTS(card) - 1) + buf->buffer->element[i].eflags = SBAL_EFLAGS_LAST_ENTRY; + else + buf->buffer->element[i].eflags = 0; + buf->buffer->element[i].sflags = 0; + } + return 0; +} + +int qeth_init_qdio_queues(struct qeth_card *card) +{ + int i, j; + int rc; + + QETH_DBF_TEXT(SETUP, 2, "initqdqs"); + + /* inbound queue */ + qdio_reset_buffers(card->qdio.in_q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q); + memset(&card->rx, 0, sizeof(struct qeth_rx)); + + qeth_initialize_working_pool_list(card); + /*give only as many buffers to hardware as we have buffer pool entries*/ + for (i = 0; i < card->qdio.in_buf_pool.buf_count - 1; i++) { + rc = qeth_init_input_buffer(card, &card->qdio.in_q->bufs[i]); + if (rc) + return rc; + } + + card->qdio.in_q->next_buf_to_init = + card->qdio.in_buf_pool.buf_count - 1; + rc = do_QDIO(CARD_DDEV(card), QDIO_FLAG_SYNC_INPUT, 0, 0, + card->qdio.in_buf_pool.buf_count - 1); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "1err%d", rc); + return rc; + } + + /* completion */ + rc = qeth_cq_init(card); + if (rc) { + return rc; + } + + /* outbound queue */ + for (i = 0; i < card->qdio.no_out_queues; ++i) { + qdio_reset_buffers(card->qdio.out_qs[i]->qdio_bufs, + QDIO_MAX_BUFFERS_PER_Q); + for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) { + qeth_clear_output_buffer(card->qdio.out_qs[i], + card->qdio.out_qs[i]->bufs[j]); + } + card->qdio.out_qs[i]->card = card; + card->qdio.out_qs[i]->next_buf_to_fill = 0; + card->qdio.out_qs[i]->do_pack = 0; + atomic_set(&card->qdio.out_qs[i]->used_buffers, 0); + atomic_set(&card->qdio.out_qs[i]->set_pci_flags_count, 0); + atomic_set(&card->qdio.out_qs[i]->state, + QETH_OUT_Q_UNLOCKED); + } + return 0; +} +EXPORT_SYMBOL_GPL(qeth_init_qdio_queues); + +static __u8 qeth_get_ipa_adp_type(enum qeth_link_types link_type) +{ + switch (link_type) { + case QETH_LINK_TYPE_HSTR: + return 2; + default: + return 1; + } +} + +static void qeth_fill_ipacmd_header(struct qeth_card *card, + struct qeth_ipa_cmd *cmd, __u8 command, + enum qeth_prot_versions prot) +{ + memset(cmd, 0, sizeof(struct qeth_ipa_cmd)); + cmd->hdr.command = command; + cmd->hdr.initiator = IPA_CMD_INITIATOR_HOST; + /* cmd->hdr.seqno is set by qeth_send_control_data() */ + cmd->hdr.adapter_type = qeth_get_ipa_adp_type(card->info.link_type); + cmd->hdr.rel_adapter_no = (u8) card->dev->dev_port; + if (card->options.layer2) + cmd->hdr.prim_version_no = 2; + else + cmd->hdr.prim_version_no = 1; + cmd->hdr.param_count = 1; + cmd->hdr.prot_version = prot; + cmd->hdr.ipa_supported = 0; + cmd->hdr.ipa_enabled = 0; +} + +struct qeth_cmd_buffer *qeth_get_ipacmd_buffer(struct qeth_card *card, + enum qeth_ipa_cmds ipacmd, enum qeth_prot_versions prot) +{ + struct qeth_cmd_buffer *iob; + + iob = qeth_get_buffer(&card->write); + if (iob) { + qeth_fill_ipacmd_header(card, __ipa_cmd(iob), ipacmd, prot); + } else { + dev_warn(&card->gdev->dev, + "The qeth driver ran out of channel command buffers\n"); + QETH_DBF_MESSAGE(1, "%s The qeth driver ran out of channel command buffers", + dev_name(&card->gdev->dev)); + } + + return iob; +} +EXPORT_SYMBOL_GPL(qeth_get_ipacmd_buffer); + +void qeth_prepare_ipa_cmd(struct qeth_card *card, struct qeth_cmd_buffer *iob) +{ + u8 prot_type = qeth_mpc_select_prot_type(card); + + memcpy(iob->data, IPA_PDU_HEADER, IPA_PDU_HEADER_SIZE); + memcpy(QETH_IPA_CMD_PROT_TYPE(iob->data), &prot_type, 1); + memcpy(QETH_IPA_CMD_DEST_ADDR(iob->data), + &card->token.ulp_connection_r, QETH_MPC_TOKEN_LENGTH); +} +EXPORT_SYMBOL_GPL(qeth_prepare_ipa_cmd); + +/** + * qeth_send_ipa_cmd() - send an IPA command + * + * See qeth_send_control_data() for explanation of the arguments. + */ + +int qeth_send_ipa_cmd(struct qeth_card *card, struct qeth_cmd_buffer *iob, + int (*reply_cb)(struct qeth_card *, struct qeth_reply*, + unsigned long), + void *reply_param) +{ + int rc; + + QETH_CARD_TEXT(card, 4, "sendipa"); + qeth_prepare_ipa_cmd(card, iob); + rc = qeth_send_control_data(card, IPA_CMD_LENGTH, + iob, reply_cb, reply_param); + if (rc == -ETIME) { + qeth_clear_ipacmd_list(card); + qeth_schedule_recovery(card); + } + return rc; +} +EXPORT_SYMBOL_GPL(qeth_send_ipa_cmd); + +static int qeth_send_startlan(struct qeth_card *card) +{ + int rc; + struct qeth_cmd_buffer *iob; + + QETH_DBF_TEXT(SETUP, 2, "strtlan"); + + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_STARTLAN, 0); + if (!iob) + return -ENOMEM; + rc = qeth_send_ipa_cmd(card, iob, NULL, NULL); + return rc; +} + +static int qeth_setadpparms_inspect_rc(struct qeth_ipa_cmd *cmd) +{ + if (!cmd->hdr.return_code) + cmd->hdr.return_code = + cmd->data.setadapterparms.hdr.return_code; + return cmd->hdr.return_code; +} + +static int qeth_query_setadapterparms_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + + QETH_CARD_TEXT(card, 3, "quyadpcb"); + if (qeth_setadpparms_inspect_rc(cmd)) + return 0; + + if (cmd->data.setadapterparms.data.query_cmds_supp.lan_type & 0x7f) { + card->info.link_type = + cmd->data.setadapterparms.data.query_cmds_supp.lan_type; + QETH_DBF_TEXT_(SETUP, 2, "lnk %d", card->info.link_type); + } + card->options.adp.supported_funcs = + cmd->data.setadapterparms.data.query_cmds_supp.supported_cmds; + return 0; +} + +static struct qeth_cmd_buffer *qeth_get_adapter_cmd(struct qeth_card *card, + __u32 command, __u32 cmdlen) +{ + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_SETADAPTERPARMS, + QETH_PROT_IPV4); + if (iob) { + cmd = __ipa_cmd(iob); + cmd->data.setadapterparms.hdr.cmdlength = cmdlen; + cmd->data.setadapterparms.hdr.command_code = command; + cmd->data.setadapterparms.hdr.used_total = 1; + cmd->data.setadapterparms.hdr.seq_no = 1; + } + + return iob; +} + +static int qeth_query_setadapterparms(struct qeth_card *card) +{ + int rc; + struct qeth_cmd_buffer *iob; + + QETH_CARD_TEXT(card, 3, "queryadp"); + iob = qeth_get_adapter_cmd(card, IPA_SETADP_QUERY_COMMANDS_SUPPORTED, + sizeof(struct qeth_ipacmd_setadpparms)); + if (!iob) + return -ENOMEM; + rc = qeth_send_ipa_cmd(card, iob, qeth_query_setadapterparms_cb, NULL); + return rc; +} + +static int qeth_query_ipassists_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd; + + QETH_DBF_TEXT(SETUP, 2, "qipasscb"); + + cmd = (struct qeth_ipa_cmd *) data; + + switch (cmd->hdr.return_code) { + case IPA_RC_NOTSUPP: + case IPA_RC_L2_UNSUPPORTED_CMD: + QETH_DBF_TEXT(SETUP, 2, "ipaunsup"); + card->options.ipa4.supported_funcs |= IPA_SETADAPTERPARMS; + card->options.ipa6.supported_funcs |= IPA_SETADAPTERPARMS; + return -0; + default: + if (cmd->hdr.return_code) { + QETH_DBF_MESSAGE(1, "%s IPA_CMD_QIPASSIST: Unhandled " + "rc=%d\n", + dev_name(&card->gdev->dev), + cmd->hdr.return_code); + return 0; + } + } + + if (cmd->hdr.prot_version == QETH_PROT_IPV4) { + card->options.ipa4.supported_funcs = cmd->hdr.ipa_supported; + card->options.ipa4.enabled_funcs = cmd->hdr.ipa_enabled; + } else if (cmd->hdr.prot_version == QETH_PROT_IPV6) { + card->options.ipa6.supported_funcs = cmd->hdr.ipa_supported; + card->options.ipa6.enabled_funcs = cmd->hdr.ipa_enabled; + } else + QETH_DBF_MESSAGE(1, "%s IPA_CMD_QIPASSIST: Flawed LIC detected" + "\n", dev_name(&card->gdev->dev)); + return 0; +} + +static int qeth_query_ipassists(struct qeth_card *card, + enum qeth_prot_versions prot) +{ + int rc; + struct qeth_cmd_buffer *iob; + + QETH_DBF_TEXT_(SETUP, 2, "qipassi%i", prot); + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_QIPASSIST, prot); + if (!iob) + return -ENOMEM; + rc = qeth_send_ipa_cmd(card, iob, qeth_query_ipassists_cb, NULL); + return rc; +} + +static int qeth_query_switch_attributes_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + struct qeth_query_switch_attributes *attrs; + struct qeth_switch_info *sw_info; + + QETH_CARD_TEXT(card, 2, "qswiatcb"); + if (qeth_setadpparms_inspect_rc(cmd)) + return 0; + + sw_info = (struct qeth_switch_info *)reply->param; + attrs = &cmd->data.setadapterparms.data.query_switch_attributes; + sw_info->capabilities = attrs->capabilities; + sw_info->settings = attrs->settings; + QETH_CARD_TEXT_(card, 2, "%04x%04x", sw_info->capabilities, + sw_info->settings); + return 0; +} + +int qeth_query_switch_attributes(struct qeth_card *card, + struct qeth_switch_info *sw_info) +{ + struct qeth_cmd_buffer *iob; + + QETH_CARD_TEXT(card, 2, "qswiattr"); + if (!qeth_adp_supported(card, IPA_SETADP_QUERY_SWITCH_ATTRIBUTES)) + return -EOPNOTSUPP; + if (!netif_carrier_ok(card->dev)) + return -ENOMEDIUM; + iob = qeth_get_adapter_cmd(card, IPA_SETADP_QUERY_SWITCH_ATTRIBUTES, + sizeof(struct qeth_ipacmd_setadpparms_hdr)); + if (!iob) + return -ENOMEM; + return qeth_send_ipa_cmd(card, iob, + qeth_query_switch_attributes_cb, sw_info); +} + +static int qeth_query_setdiagass_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd; + __u16 rc; + + cmd = (struct qeth_ipa_cmd *)data; + rc = cmd->hdr.return_code; + if (rc) + QETH_CARD_TEXT_(card, 2, "diagq:%x", rc); + else + card->info.diagass_support = cmd->data.diagass.ext; + return 0; +} + +static int qeth_query_setdiagass(struct qeth_card *card) +{ + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + QETH_DBF_TEXT(SETUP, 2, "qdiagass"); + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_SET_DIAG_ASS, 0); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + cmd->data.diagass.subcmd_len = 16; + cmd->data.diagass.subcmd = QETH_DIAGS_CMD_QUERY; + return qeth_send_ipa_cmd(card, iob, qeth_query_setdiagass_cb, NULL); +} + +static void qeth_get_trap_id(struct qeth_card *card, struct qeth_trap_id *tid) +{ + unsigned long info = get_zeroed_page(GFP_KERNEL); + struct sysinfo_2_2_2 *info222 = (struct sysinfo_2_2_2 *)info; + struct sysinfo_3_2_2 *info322 = (struct sysinfo_3_2_2 *)info; + struct ccw_dev_id ccwid; + int level; + + tid->chpid = card->info.chpid; + ccw_device_get_id(CARD_RDEV(card), &ccwid); + tid->ssid = ccwid.ssid; + tid->devno = ccwid.devno; + if (!info) + return; + level = stsi(NULL, 0, 0, 0); + if ((level >= 2) && (stsi(info222, 2, 2, 2) == 0)) + tid->lparnr = info222->lpar_number; + if ((level >= 3) && (stsi(info322, 3, 2, 2) == 0)) { + EBCASC(info322->vm[0].name, sizeof(info322->vm[0].name)); + memcpy(tid->vmname, info322->vm[0].name, sizeof(tid->vmname)); + } + free_page(info); + return; +} + +static int qeth_hw_trap_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd; + __u16 rc; + + cmd = (struct qeth_ipa_cmd *)data; + rc = cmd->hdr.return_code; + if (rc) + QETH_CARD_TEXT_(card, 2, "trapc:%x", rc); + return 0; +} + +int qeth_hw_trap(struct qeth_card *card, enum qeth_diags_trap_action action) +{ + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + QETH_DBF_TEXT(SETUP, 2, "diagtrap"); + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_SET_DIAG_ASS, 0); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + cmd->data.diagass.subcmd_len = 80; + cmd->data.diagass.subcmd = QETH_DIAGS_CMD_TRAP; + cmd->data.diagass.type = 1; + cmd->data.diagass.action = action; + switch (action) { + case QETH_DIAGS_TRAP_ARM: + cmd->data.diagass.options = 0x0003; + cmd->data.diagass.ext = 0x00010000 + + sizeof(struct qeth_trap_id); + qeth_get_trap_id(card, + (struct qeth_trap_id *)cmd->data.diagass.cdata); + break; + case QETH_DIAGS_TRAP_DISARM: + cmd->data.diagass.options = 0x0001; + break; + case QETH_DIAGS_TRAP_CAPTURE: + break; + } + return qeth_send_ipa_cmd(card, iob, qeth_hw_trap_cb, NULL); +} +EXPORT_SYMBOL_GPL(qeth_hw_trap); + +static int qeth_check_qdio_errors(struct qeth_card *card, + struct qdio_buffer *buf, + unsigned int qdio_error, + const char *dbftext) +{ + if (qdio_error) { + QETH_CARD_TEXT(card, 2, dbftext); + QETH_CARD_TEXT_(card, 2, " F15=%02X", + buf->element[15].sflags); + QETH_CARD_TEXT_(card, 2, " F14=%02X", + buf->element[14].sflags); + QETH_CARD_TEXT_(card, 2, " qerr=%X", qdio_error); + if ((buf->element[15].sflags) == 0x12) { + card->stats.rx_dropped++; + return 0; + } else + return 1; + } + return 0; +} + +static void qeth_queue_input_buffer(struct qeth_card *card, int index) +{ + struct qeth_qdio_q *queue = card->qdio.in_q; + struct list_head *lh; + int count; + int i; + int rc; + int newcount = 0; + + count = (index < queue->next_buf_to_init)? + card->qdio.in_buf_pool.buf_count - + (queue->next_buf_to_init - index) : + card->qdio.in_buf_pool.buf_count - + (queue->next_buf_to_init + QDIO_MAX_BUFFERS_PER_Q - index); + /* only requeue at a certain threshold to avoid SIGAs */ + if (count >= QETH_IN_BUF_REQUEUE_THRESHOLD(card)) { + for (i = queue->next_buf_to_init; + i < queue->next_buf_to_init + count; ++i) { + if (qeth_init_input_buffer(card, + &queue->bufs[i % QDIO_MAX_BUFFERS_PER_Q])) { + break; + } else { + newcount++; + } + } + + if (newcount < count) { + /* we are in memory shortage so we switch back to + traditional skb allocation and drop packages */ + atomic_set(&card->force_alloc_skb, 3); + count = newcount; + } else { + atomic_add_unless(&card->force_alloc_skb, -1, 0); + } + + if (!count) { + i = 0; + list_for_each(lh, &card->qdio.in_buf_pool.entry_list) + i++; + if (i == card->qdio.in_buf_pool.buf_count) { + QETH_CARD_TEXT(card, 2, "qsarbw"); + card->reclaim_index = index; + schedule_delayed_work( + &card->buffer_reclaim_work, + QETH_RECLAIM_WORK_TIME); + } + return; + } + + /* + * according to old code it should be avoided to requeue all + * 128 buffers in order to benefit from PCI avoidance. + * this function keeps at least one buffer (the buffer at + * 'index') un-requeued -> this buffer is the first buffer that + * will be requeued the next time + */ + if (card->options.performance_stats) { + card->perf_stats.inbound_do_qdio_cnt++; + card->perf_stats.inbound_do_qdio_start_time = + qeth_get_micros(); + } + rc = do_QDIO(CARD_DDEV(card), QDIO_FLAG_SYNC_INPUT, 0, + queue->next_buf_to_init, count); + if (card->options.performance_stats) + card->perf_stats.inbound_do_qdio_time += + qeth_get_micros() - + card->perf_stats.inbound_do_qdio_start_time; + if (rc) { + QETH_CARD_TEXT(card, 2, "qinberr"); + } + queue->next_buf_to_init = (queue->next_buf_to_init + count) % + QDIO_MAX_BUFFERS_PER_Q; + } +} + +static void qeth_buffer_reclaim_work(struct work_struct *work) +{ + struct qeth_card *card = container_of(work, struct qeth_card, + buffer_reclaim_work.work); + + QETH_CARD_TEXT_(card, 2, "brw:%x", card->reclaim_index); + qeth_queue_input_buffer(card, card->reclaim_index); +} + +static void qeth_handle_send_error(struct qeth_card *card, + struct qeth_qdio_out_buffer *buffer, unsigned int qdio_err) +{ + int sbalf15 = buffer->buffer->element[15].sflags; + + QETH_CARD_TEXT(card, 6, "hdsnderr"); + if (card->info.type == QETH_CARD_TYPE_IQD) { + if (sbalf15 == 0) { + qdio_err = 0; + } else { + qdio_err = 1; + } + } + qeth_check_qdio_errors(card, buffer->buffer, qdio_err, "qouterr"); + + if (!qdio_err) + return; + + if ((sbalf15 >= 15) && (sbalf15 <= 31)) + return; + + QETH_CARD_TEXT(card, 1, "lnkfail"); + QETH_CARD_TEXT_(card, 1, "%04x %02x", + (u16)qdio_err, (u8)sbalf15); +} + +/** + * qeth_prep_flush_pack_buffer - Prepares flushing of a packing buffer. + * @queue: queue to check for packing buffer + * + * Returns number of buffers that were prepared for flush. + */ +static int qeth_prep_flush_pack_buffer(struct qeth_qdio_out_q *queue) +{ + struct qeth_qdio_out_buffer *buffer; + + buffer = queue->bufs[queue->next_buf_to_fill]; + if ((atomic_read(&buffer->state) == QETH_QDIO_BUF_EMPTY) && + (buffer->next_element_to_fill > 0)) { + /* it's a packing buffer */ + atomic_set(&buffer->state, QETH_QDIO_BUF_PRIMED); + queue->next_buf_to_fill = + (queue->next_buf_to_fill + 1) % QDIO_MAX_BUFFERS_PER_Q; + return 1; + } + return 0; +} + +/* + * Switched to packing state if the number of used buffers on a queue + * reaches a certain limit. + */ +static void qeth_switch_to_packing_if_needed(struct qeth_qdio_out_q *queue) +{ + if (!queue->do_pack) { + if (atomic_read(&queue->used_buffers) + >= QETH_HIGH_WATERMARK_PACK){ + /* switch non-PACKING -> PACKING */ + QETH_CARD_TEXT(queue->card, 6, "np->pack"); + if (queue->card->options.performance_stats) + queue->card->perf_stats.sc_dp_p++; + queue->do_pack = 1; + } + } +} + +/* + * Switches from packing to non-packing mode. If there is a packing + * buffer on the queue this buffer will be prepared to be flushed. + * In that case 1 is returned to inform the caller. If no buffer + * has to be flushed, zero is returned. + */ +static int qeth_switch_to_nonpacking_if_needed(struct qeth_qdio_out_q *queue) +{ + if (queue->do_pack) { + if (atomic_read(&queue->used_buffers) + <= QETH_LOW_WATERMARK_PACK) { + /* switch PACKING -> non-PACKING */ + QETH_CARD_TEXT(queue->card, 6, "pack->np"); + if (queue->card->options.performance_stats) + queue->card->perf_stats.sc_p_dp++; + queue->do_pack = 0; + return qeth_prep_flush_pack_buffer(queue); + } + } + return 0; +} + +static void qeth_flush_buffers(struct qeth_qdio_out_q *queue, int index, + int count) +{ + struct qeth_qdio_out_buffer *buf; + int rc; + int i; + unsigned int qdio_flags; + + for (i = index; i < index + count; ++i) { + int bidx = i % QDIO_MAX_BUFFERS_PER_Q; + buf = queue->bufs[bidx]; + buf->buffer->element[buf->next_element_to_fill - 1].eflags |= + SBAL_EFLAGS_LAST_ENTRY; + + if (queue->bufstates) + queue->bufstates[bidx].user = buf; + + if (queue->card->info.type == QETH_CARD_TYPE_IQD) + continue; + + if (!queue->do_pack) { + if ((atomic_read(&queue->used_buffers) >= + (QETH_HIGH_WATERMARK_PACK - + QETH_WATERMARK_PACK_FUZZ)) && + !atomic_read(&queue->set_pci_flags_count)) { + /* it's likely that we'll go to packing + * mode soon */ + atomic_inc(&queue->set_pci_flags_count); + buf->buffer->element[0].sflags |= SBAL_SFLAGS0_PCI_REQ; + } + } else { + if (!atomic_read(&queue->set_pci_flags_count)) { + /* + * there's no outstanding PCI any more, so we + * have to request a PCI to be sure the the PCI + * will wake at some time in the future then we + * can flush packed buffers that might still be + * hanging around, which can happen if no + * further send was requested by the stack + */ + atomic_inc(&queue->set_pci_flags_count); + buf->buffer->element[0].sflags |= SBAL_SFLAGS0_PCI_REQ; + } + } + } + + netif_trans_update(queue->card->dev); + if (queue->card->options.performance_stats) { + queue->card->perf_stats.outbound_do_qdio_cnt++; + queue->card->perf_stats.outbound_do_qdio_start_time = + qeth_get_micros(); + } + qdio_flags = QDIO_FLAG_SYNC_OUTPUT; + if (atomic_read(&queue->set_pci_flags_count)) + qdio_flags |= QDIO_FLAG_PCI_OUT; + atomic_add(count, &queue->used_buffers); + + rc = do_QDIO(CARD_DDEV(queue->card), qdio_flags, + queue->queue_no, index, count); + if (queue->card->options.performance_stats) + queue->card->perf_stats.outbound_do_qdio_time += + qeth_get_micros() - + queue->card->perf_stats.outbound_do_qdio_start_time; + if (rc) { + queue->card->stats.tx_errors += count; + /* ignore temporary SIGA errors without busy condition */ + if (rc == -ENOBUFS) + return; + QETH_CARD_TEXT(queue->card, 2, "flushbuf"); + QETH_CARD_TEXT_(queue->card, 2, " q%d", queue->queue_no); + QETH_CARD_TEXT_(queue->card, 2, " idx%d", index); + QETH_CARD_TEXT_(queue->card, 2, " c%d", count); + QETH_CARD_TEXT_(queue->card, 2, " err%d", rc); + + /* this must not happen under normal circumstances. if it + * happens something is really wrong -> recover */ + qeth_schedule_recovery(queue->card); + return; + } + if (queue->card->options.performance_stats) + queue->card->perf_stats.bufs_sent += count; +} + +static void qeth_check_outbound_queue(struct qeth_qdio_out_q *queue) +{ + int index; + int flush_cnt = 0; + int q_was_packing = 0; + + /* + * check if weed have to switch to non-packing mode or if + * we have to get a pci flag out on the queue + */ + if ((atomic_read(&queue->used_buffers) <= QETH_LOW_WATERMARK_PACK) || + !atomic_read(&queue->set_pci_flags_count)) { + if (atomic_xchg(&queue->state, QETH_OUT_Q_LOCKED_FLUSH) == + QETH_OUT_Q_UNLOCKED) { + /* + * If we get in here, there was no action in + * do_send_packet. So, we check if there is a + * packing buffer to be flushed here. + */ + netif_stop_queue(queue->card->dev); + index = queue->next_buf_to_fill; + q_was_packing = queue->do_pack; + /* queue->do_pack may change */ + barrier(); + flush_cnt += qeth_switch_to_nonpacking_if_needed(queue); + if (!flush_cnt && + !atomic_read(&queue->set_pci_flags_count)) + flush_cnt += qeth_prep_flush_pack_buffer(queue); + if (queue->card->options.performance_stats && + q_was_packing) + queue->card->perf_stats.bufs_sent_pack += + flush_cnt; + if (flush_cnt) + qeth_flush_buffers(queue, index, flush_cnt); + atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED); + } + } +} + +static void qeth_qdio_start_poll(struct ccw_device *ccwdev, int queue, + unsigned long card_ptr) +{ + struct qeth_card *card = (struct qeth_card *)card_ptr; + + if (card->dev->flags & IFF_UP) + napi_schedule(&card->napi); +} + +int qeth_configure_cq(struct qeth_card *card, enum qeth_cq cq) +{ + int rc; + + if (card->options.cq == QETH_CQ_NOTAVAILABLE) { + rc = -1; + goto out; + } else { + if (card->options.cq == cq) { + rc = 0; + goto out; + } + + if (card->state != CARD_STATE_DOWN && + card->state != CARD_STATE_RECOVER) { + rc = -1; + goto out; + } + + qeth_free_qdio_buffers(card); + card->options.cq = cq; + rc = 0; + } +out: + return rc; + +} +EXPORT_SYMBOL_GPL(qeth_configure_cq); + +static void qeth_qdio_cq_handler(struct qeth_card *card, unsigned int qdio_err, + unsigned int queue, int first_element, + int count) +{ + struct qeth_qdio_q *cq = card->qdio.c_q; + int i; + int rc; + + if (!qeth_is_cq(card, queue)) + goto out; + + QETH_CARD_TEXT_(card, 5, "qcqhe%d", first_element); + QETH_CARD_TEXT_(card, 5, "qcqhc%d", count); + QETH_CARD_TEXT_(card, 5, "qcqherr%d", qdio_err); + + if (qdio_err) { + netif_stop_queue(card->dev); + qeth_schedule_recovery(card); + goto out; + } + + if (card->options.performance_stats) { + card->perf_stats.cq_cnt++; + card->perf_stats.cq_start_time = qeth_get_micros(); + } + + for (i = first_element; i < first_element + count; ++i) { + int bidx = i % QDIO_MAX_BUFFERS_PER_Q; + struct qdio_buffer *buffer = cq->qdio_bufs[bidx]; + int e = 0; + + while ((e < QDIO_MAX_ELEMENTS_PER_BUFFER) && + buffer->element[e].addr) { + unsigned long phys_aob_addr; + + phys_aob_addr = (unsigned long) buffer->element[e].addr; + qeth_qdio_handle_aob(card, phys_aob_addr); + ++e; + } + qeth_scrub_qdio_buffer(buffer, QDIO_MAX_ELEMENTS_PER_BUFFER); + } + rc = do_QDIO(CARD_DDEV(card), QDIO_FLAG_SYNC_INPUT, queue, + card->qdio.c_q->next_buf_to_init, + count); + if (rc) { + dev_warn(&card->gdev->dev, + "QDIO reported an error, rc=%i\n", rc); + QETH_CARD_TEXT(card, 2, "qcqherr"); + } + card->qdio.c_q->next_buf_to_init = (card->qdio.c_q->next_buf_to_init + + count) % QDIO_MAX_BUFFERS_PER_Q; + + netif_wake_queue(card->dev); + + if (card->options.performance_stats) { + int delta_t = qeth_get_micros(); + delta_t -= card->perf_stats.cq_start_time; + card->perf_stats.cq_time += delta_t; + } +out: + return; +} + +static void qeth_qdio_input_handler(struct ccw_device *ccwdev, + unsigned int qdio_err, int queue, + int first_elem, int count, + unsigned long card_ptr) +{ + struct qeth_card *card = (struct qeth_card *)card_ptr; + + QETH_CARD_TEXT_(card, 2, "qihq%d", queue); + QETH_CARD_TEXT_(card, 2, "qiec%d", qdio_err); + + if (qeth_is_cq(card, queue)) + qeth_qdio_cq_handler(card, qdio_err, queue, first_elem, count); + else if (qdio_err) + qeth_schedule_recovery(card); +} + +static void qeth_qdio_output_handler(struct ccw_device *ccwdev, + unsigned int qdio_error, int __queue, + int first_element, int count, + unsigned long card_ptr) +{ + struct qeth_card *card = (struct qeth_card *) card_ptr; + struct qeth_qdio_out_q *queue = card->qdio.out_qs[__queue]; + struct qeth_qdio_out_buffer *buffer; + int i; + + QETH_CARD_TEXT(card, 6, "qdouhdl"); + if (qdio_error & QDIO_ERROR_FATAL) { + QETH_CARD_TEXT(card, 2, "achkcond"); + netif_stop_queue(card->dev); + qeth_schedule_recovery(card); + return; + } + if (card->options.performance_stats) { + card->perf_stats.outbound_handler_cnt++; + card->perf_stats.outbound_handler_start_time = + qeth_get_micros(); + } + for (i = first_element; i < (first_element + count); ++i) { + int bidx = i % QDIO_MAX_BUFFERS_PER_Q; + buffer = queue->bufs[bidx]; + qeth_handle_send_error(card, buffer, qdio_error); + + if (queue->bufstates && + (queue->bufstates[bidx].flags & + QDIO_OUTBUF_STATE_FLAG_PENDING) != 0) { + WARN_ON_ONCE(card->options.cq != QETH_CQ_ENABLED); + + if (atomic_cmpxchg(&buffer->state, + QETH_QDIO_BUF_PRIMED, + QETH_QDIO_BUF_PENDING) == + QETH_QDIO_BUF_PRIMED) { + qeth_notify_skbs(queue, buffer, + TX_NOTIFY_PENDING); + } + QETH_CARD_TEXT_(queue->card, 5, "pel%d", bidx); + + /* prepare the queue slot for re-use: */ + qeth_scrub_qdio_buffer(buffer->buffer, + QETH_MAX_BUFFER_ELEMENTS(card)); + if (qeth_init_qdio_out_buf(queue, bidx)) { + QETH_CARD_TEXT(card, 2, "outofbuf"); + qeth_schedule_recovery(card); + } + } else { + if (card->options.cq == QETH_CQ_ENABLED) { + enum iucv_tx_notify n; + + n = qeth_compute_cq_notification( + buffer->buffer->element[15].sflags, 0); + qeth_notify_skbs(queue, buffer, n); + } + + qeth_clear_output_buffer(queue, buffer); + } + qeth_cleanup_handled_pending(queue, bidx, 0); + } + atomic_sub(count, &queue->used_buffers); + /* check if we need to do something on this outbound queue */ + if (card->info.type != QETH_CARD_TYPE_IQD) + qeth_check_outbound_queue(queue); + + netif_wake_queue(queue->card->dev); + if (card->options.performance_stats) + card->perf_stats.outbound_handler_time += qeth_get_micros() - + card->perf_stats.outbound_handler_start_time; +} + +/* We cannot use outbound queue 3 for unicast packets on HiperSockets */ +static inline int qeth_cut_iqd_prio(struct qeth_card *card, int queue_num) +{ + if ((card->info.type == QETH_CARD_TYPE_IQD) && (queue_num == 3)) + return 2; + return queue_num; +} + +/** + * Note: Function assumes that we have 4 outbound queues. + */ +int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb, + int ipv) +{ + __be16 *tci; + u8 tos; + + switch (card->qdio.do_prio_queueing) { + case QETH_PRIO_Q_ING_TOS: + case QETH_PRIO_Q_ING_PREC: + switch (ipv) { + case 4: + tos = ipv4_get_dsfield(ip_hdr(skb)); + break; + case 6: + tos = ipv6_get_dsfield(ipv6_hdr(skb)); + break; + default: + return card->qdio.default_out_queue; + } + if (card->qdio.do_prio_queueing == QETH_PRIO_Q_ING_PREC) + return qeth_cut_iqd_prio(card, ~tos >> 6 & 3); + if (tos & IPTOS_MINCOST) + return qeth_cut_iqd_prio(card, 3); + if (tos & IPTOS_RELIABILITY) + return 2; + if (tos & IPTOS_THROUGHPUT) + return 1; + if (tos & IPTOS_LOWDELAY) + return 0; + break; + case QETH_PRIO_Q_ING_SKB: + if (skb->priority > 5) + return 0; + return qeth_cut_iqd_prio(card, ~skb->priority >> 1 & 3); + case QETH_PRIO_Q_ING_VLAN: + tci = &((struct ethhdr *)skb->data)->h_proto; + if (be16_to_cpu(*tci) == ETH_P_8021Q) + return qeth_cut_iqd_prio(card, + ~be16_to_cpu(*(tci + 1)) >> (VLAN_PRIO_SHIFT + 1) & 3); + break; + default: + break; + } + return card->qdio.default_out_queue; +} +EXPORT_SYMBOL_GPL(qeth_get_priority_queue); + +/** + * qeth_get_elements_for_frags() - find number of SBALEs for skb frags. + * @skb: SKB address + * + * Returns the number of pages, and thus QDIO buffer elements, needed to cover + * fragmented part of the SKB. Returns zero for linear SKB. + */ +int qeth_get_elements_for_frags(struct sk_buff *skb) +{ + int cnt, elements = 0; + + for (cnt = 0; cnt < skb_shinfo(skb)->nr_frags; cnt++) { + struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[cnt]; + + elements += qeth_get_elements_for_range( + (addr_t)skb_frag_address(frag), + (addr_t)skb_frag_address(frag) + skb_frag_size(frag)); + } + return elements; +} +EXPORT_SYMBOL_GPL(qeth_get_elements_for_frags); + +static unsigned int qeth_count_elements(struct sk_buff *skb, int data_offset) +{ + unsigned int elements = qeth_get_elements_for_frags(skb); + addr_t end = (addr_t)skb->data + skb_headlen(skb); + addr_t start = (addr_t)skb->data + data_offset; + + if (start != end) + elements += qeth_get_elements_for_range(start, end); + return elements; +} + +/** + * qeth_get_elements_no() - find number of SBALEs for skb data, inc. frags. + * @card: qeth card structure, to check max. elems. + * @skb: SKB address + * @extra_elems: extra elems needed, to check against max. + * @data_offset: range starts at skb->data + data_offset + * + * Returns the number of pages, and thus QDIO buffer elements, needed to cover + * skb data, including linear part and fragments. Checks if the result plus + * extra_elems fits under the limit for the card. Returns 0 if it does not. + * Note: extra_elems is not included in the returned result. + */ +int qeth_get_elements_no(struct qeth_card *card, + struct sk_buff *skb, int extra_elems, int data_offset) +{ + int elements = qeth_count_elements(skb, data_offset); + + if ((elements + extra_elems) > QETH_MAX_BUFFER_ELEMENTS(card)) { + QETH_DBF_MESSAGE(2, "Invalid size of IP packet " + "(Number=%d / Length=%d). Discarded.\n", + elements + extra_elems, skb->len); + return 0; + } + return elements; +} +EXPORT_SYMBOL_GPL(qeth_get_elements_no); + +int qeth_hdr_chk_and_bounce(struct sk_buff *skb, struct qeth_hdr **hdr, int len) +{ + int hroom, inpage, rest; + + if (((unsigned long)skb->data & PAGE_MASK) != + (((unsigned long)skb->data + len - 1) & PAGE_MASK)) { + hroom = skb_headroom(skb); + inpage = PAGE_SIZE - ((unsigned long) skb->data % PAGE_SIZE); + rest = len - inpage; + if (rest > hroom) + return 1; + memmove(skb->data - rest, skb->data, skb_headlen(skb)); + skb->data -= rest; + skb->tail -= rest; + *hdr = (struct qeth_hdr *)skb->data; + QETH_DBF_MESSAGE(2, "skb bounce len: %d rest: %d\n", len, rest); + } + return 0; +} +EXPORT_SYMBOL_GPL(qeth_hdr_chk_and_bounce); + +/** + * qeth_add_hw_header() - add a HW header to an skb. + * @skb: skb that the HW header should be added to. + * @hdr: double pointer to a qeth_hdr. When returning with >= 0, + * it contains a valid pointer to a qeth_hdr. + * @hdr_len: length of the HW header. + * @proto_len: length of protocol headers that need to be in same page as the + * HW header. + * + * Returns the pushed length. If the header can't be pushed on + * (eg. because it would cross a page boundary), it is allocated from + * the cache instead and 0 is returned. + * The number of needed buffer elements is returned in @elements. + * Error to create the hdr is indicated by returning with < 0. + */ +int qeth_add_hw_header(struct qeth_card *card, struct sk_buff *skb, + struct qeth_hdr **hdr, unsigned int hdr_len, + unsigned int proto_len, unsigned int *elements) +{ + const unsigned int max_elements = QETH_MAX_BUFFER_ELEMENTS(card); + const unsigned int contiguous = proto_len ? proto_len : 1; + unsigned int __elements; + addr_t start, end; + bool push_ok; + int rc; + +check_layout: + start = (addr_t)skb->data - hdr_len; + end = (addr_t)skb->data; + + if (qeth_get_elements_for_range(start, end + contiguous) == 1) { + /* Push HW header into same page as first protocol header. */ + push_ok = true; + __elements = qeth_count_elements(skb, 0); + } else if (!proto_len && qeth_get_elements_for_range(start, end) == 1) { + /* Push HW header into a new page. */ + push_ok = true; + __elements = 1 + qeth_count_elements(skb, 0); + } else { + /* Use header cache, copy protocol headers up. */ + push_ok = false; + __elements = 1 + qeth_count_elements(skb, proto_len); + } + + /* Compress skb to fit into one IO buffer: */ + if (__elements > max_elements) { + if (!skb_is_nonlinear(skb)) { + /* Drop it, no easy way of shrinking it further. */ + QETH_DBF_MESSAGE(2, "Dropped an oversized skb (Max Elements=%u / Actual=%u / Length=%u).\n", + max_elements, __elements, skb->len); + return -E2BIG; + } + + rc = skb_linearize(skb); + if (card->options.performance_stats) { + if (rc) + card->perf_stats.tx_linfail++; + else + card->perf_stats.tx_lin++; + } + if (rc) + return rc; + + /* Linearization changed the layout, re-evaluate: */ + goto check_layout; + } + + *elements = __elements; + /* Add the header: */ + if (push_ok) { + *hdr = skb_push(skb, hdr_len); + return hdr_len; + } + /* fall back */ + *hdr = kmem_cache_alloc(qeth_core_header_cache, GFP_ATOMIC); + if (!*hdr) + return -ENOMEM; + /* Copy protocol headers behind HW header: */ + skb_copy_from_linear_data(skb, ((char *)*hdr) + hdr_len, proto_len); + return 0; +} +EXPORT_SYMBOL_GPL(qeth_add_hw_header); + +static void __qeth_fill_buffer(struct sk_buff *skb, + struct qeth_qdio_out_buffer *buf, + bool is_first_elem, unsigned int offset) +{ + struct qdio_buffer *buffer = buf->buffer; + int element = buf->next_element_to_fill; + int length = skb_headlen(skb) - offset; + char *data = skb->data + offset; + int length_here, cnt; + + /* map linear part into buffer element(s) */ + while (length > 0) { + /* length_here is the remaining amount of data in this page */ + length_here = PAGE_SIZE - ((unsigned long) data % PAGE_SIZE); + if (length < length_here) + length_here = length; + + buffer->element[element].addr = data; + buffer->element[element].length = length_here; + length -= length_here; + if (is_first_elem) { + is_first_elem = false; + if (length || skb_is_nonlinear(skb)) + /* skb needs additional elements */ + buffer->element[element].eflags = + SBAL_EFLAGS_FIRST_FRAG; + else + buffer->element[element].eflags = 0; + } else { + buffer->element[element].eflags = + SBAL_EFLAGS_MIDDLE_FRAG; + } + data += length_here; + element++; + } + + /* map page frags into buffer element(s) */ + for (cnt = 0; cnt < skb_shinfo(skb)->nr_frags; cnt++) { + skb_frag_t *frag = &skb_shinfo(skb)->frags[cnt]; + + data = skb_frag_address(frag); + length = skb_frag_size(frag); + while (length > 0) { + length_here = PAGE_SIZE - + ((unsigned long) data % PAGE_SIZE); + if (length < length_here) + length_here = length; + + buffer->element[element].addr = data; + buffer->element[element].length = length_here; + buffer->element[element].eflags = + SBAL_EFLAGS_MIDDLE_FRAG; + length -= length_here; + data += length_here; + element++; + } + } + + if (buffer->element[element - 1].eflags) + buffer->element[element - 1].eflags = SBAL_EFLAGS_LAST_FRAG; + buf->next_element_to_fill = element; +} + +/** + * qeth_fill_buffer() - map skb into an output buffer + * @queue: QDIO queue to submit the buffer on + * @buf: buffer to transport the skb + * @skb: skb to map into the buffer + * @hdr: qeth_hdr for this skb. Either at skb->data, or allocated + * from qeth_core_header_cache. + * @offset: when mapping the skb, start at skb->data + offset + * @hd_len: if > 0, build a dedicated header element of this size + */ +static int qeth_fill_buffer(struct qeth_qdio_out_q *queue, + struct qeth_qdio_out_buffer *buf, + struct sk_buff *skb, struct qeth_hdr *hdr, + unsigned int offset, unsigned int hd_len) +{ + struct qdio_buffer *buffer = buf->buffer; + bool is_first_elem = true; + int flush_cnt = 0; + + refcount_inc(&skb->users); + skb_queue_tail(&buf->skb_list, skb); + + /* build dedicated header element */ + if (hd_len) { + int element = buf->next_element_to_fill; + is_first_elem = false; + + buffer->element[element].addr = hdr; + buffer->element[element].length = hd_len; + buffer->element[element].eflags = SBAL_EFLAGS_FIRST_FRAG; + /* remember to free cache-allocated qeth_hdr: */ + buf->is_header[element] = ((void *)hdr != skb->data); + buf->next_element_to_fill++; + } + + __qeth_fill_buffer(skb, buf, is_first_elem, offset); + + if (!queue->do_pack) { + QETH_CARD_TEXT(queue->card, 6, "fillbfnp"); + /* set state to PRIMED -> will be flushed */ + atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED); + flush_cnt = 1; + } else { + QETH_CARD_TEXT(queue->card, 6, "fillbfpa"); + if (queue->card->options.performance_stats) + queue->card->perf_stats.skbs_sent_pack++; + if (buf->next_element_to_fill >= + QETH_MAX_BUFFER_ELEMENTS(queue->card)) { + /* + * packed buffer if full -> set state PRIMED + * -> will be flushed + */ + atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED); + flush_cnt = 1; + } + } + return flush_cnt; +} + +int qeth_do_send_packet_fast(struct qeth_qdio_out_q *queue, struct sk_buff *skb, + struct qeth_hdr *hdr, unsigned int offset, + unsigned int hd_len) +{ + int index = queue->next_buf_to_fill; + struct qeth_qdio_out_buffer *buffer = queue->bufs[index]; + + /* + * check if buffer is empty to make sure that we do not 'overtake' + * ourselves and try to fill a buffer that is already primed + */ + if (atomic_read(&buffer->state) != QETH_QDIO_BUF_EMPTY) + return -EBUSY; + queue->next_buf_to_fill = (index + 1) % QDIO_MAX_BUFFERS_PER_Q; + qeth_fill_buffer(queue, buffer, skb, hdr, offset, hd_len); + qeth_flush_buffers(queue, index, 1); + return 0; +} +EXPORT_SYMBOL_GPL(qeth_do_send_packet_fast); + +int qeth_do_send_packet(struct qeth_card *card, struct qeth_qdio_out_q *queue, + struct sk_buff *skb, struct qeth_hdr *hdr, + unsigned int offset, unsigned int hd_len, + int elements_needed) +{ + struct qeth_qdio_out_buffer *buffer; + int start_index; + int flush_count = 0; + int do_pack = 0; + int tmp; + int rc = 0; + + /* spin until we get the queue ... */ + while (atomic_cmpxchg(&queue->state, QETH_OUT_Q_UNLOCKED, + QETH_OUT_Q_LOCKED) != QETH_OUT_Q_UNLOCKED); + start_index = queue->next_buf_to_fill; + buffer = queue->bufs[queue->next_buf_to_fill]; + /* + * check if buffer is empty to make sure that we do not 'overtake' + * ourselves and try to fill a buffer that is already primed + */ + if (atomic_read(&buffer->state) != QETH_QDIO_BUF_EMPTY) { + atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED); + return -EBUSY; + } + /* check if we need to switch packing state of this queue */ + qeth_switch_to_packing_if_needed(queue); + if (queue->do_pack) { + do_pack = 1; + /* does packet fit in current buffer? */ + if ((QETH_MAX_BUFFER_ELEMENTS(card) - + buffer->next_element_to_fill) < elements_needed) { + /* ... no -> set state PRIMED */ + atomic_set(&buffer->state, QETH_QDIO_BUF_PRIMED); + flush_count++; + queue->next_buf_to_fill = + (queue->next_buf_to_fill + 1) % + QDIO_MAX_BUFFERS_PER_Q; + buffer = queue->bufs[queue->next_buf_to_fill]; + /* we did a step forward, so check buffer state + * again */ + if (atomic_read(&buffer->state) != + QETH_QDIO_BUF_EMPTY) { + qeth_flush_buffers(queue, start_index, + flush_count); + atomic_set(&queue->state, + QETH_OUT_Q_UNLOCKED); + rc = -EBUSY; + goto out; + } + } + } + tmp = qeth_fill_buffer(queue, buffer, skb, hdr, offset, hd_len); + queue->next_buf_to_fill = (queue->next_buf_to_fill + tmp) % + QDIO_MAX_BUFFERS_PER_Q; + flush_count += tmp; + if (flush_count) + qeth_flush_buffers(queue, start_index, flush_count); + else if (!atomic_read(&queue->set_pci_flags_count)) + atomic_xchg(&queue->state, QETH_OUT_Q_LOCKED_FLUSH); + /* + * queue->state will go from LOCKED -> UNLOCKED or from + * LOCKED_FLUSH -> LOCKED if output_handler wanted to 'notify' us + * (switch packing state or flush buffer to get another pci flag out). + * In that case we will enter this loop + */ + while (atomic_dec_return(&queue->state)) { + start_index = queue->next_buf_to_fill; + /* check if we can go back to non-packing state */ + tmp = qeth_switch_to_nonpacking_if_needed(queue); + /* + * check if we need to flush a packing buffer to get a pci + * flag out on the queue + */ + if (!tmp && !atomic_read(&queue->set_pci_flags_count)) + tmp = qeth_prep_flush_pack_buffer(queue); + if (tmp) { + qeth_flush_buffers(queue, start_index, tmp); + flush_count += tmp; + } + } +out: + /* at this point the queue is UNLOCKED again */ + if (queue->card->options.performance_stats && do_pack) + queue->card->perf_stats.bufs_sent_pack += flush_count; + + return rc; +} +EXPORT_SYMBOL_GPL(qeth_do_send_packet); + +static int qeth_setadp_promisc_mode_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + struct qeth_ipacmd_setadpparms *setparms; + + QETH_CARD_TEXT(card, 4, "prmadpcb"); + + setparms = &(cmd->data.setadapterparms); + if (qeth_setadpparms_inspect_rc(cmd)) { + QETH_CARD_TEXT_(card, 4, "prmrc%x", cmd->hdr.return_code); + setparms->data.mode = SET_PROMISC_MODE_OFF; + } + card->info.promisc_mode = setparms->data.mode; + return 0; +} + +void qeth_setadp_promisc_mode(struct qeth_card *card) +{ + enum qeth_ipa_promisc_modes mode; + struct net_device *dev = card->dev; + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + QETH_CARD_TEXT(card, 4, "setprom"); + + if (((dev->flags & IFF_PROMISC) && + (card->info.promisc_mode == SET_PROMISC_MODE_ON)) || + (!(dev->flags & IFF_PROMISC) && + (card->info.promisc_mode == SET_PROMISC_MODE_OFF))) + return; + mode = SET_PROMISC_MODE_OFF; + if (dev->flags & IFF_PROMISC) + mode = SET_PROMISC_MODE_ON; + QETH_CARD_TEXT_(card, 4, "mode:%x", mode); + + iob = qeth_get_adapter_cmd(card, IPA_SETADP_SET_PROMISC_MODE, + sizeof(struct qeth_ipacmd_setadpparms_hdr) + 8); + if (!iob) + return; + cmd = __ipa_cmd(iob); + cmd->data.setadapterparms.data.mode = mode; + qeth_send_ipa_cmd(card, iob, qeth_setadp_promisc_mode_cb, NULL); +} +EXPORT_SYMBOL_GPL(qeth_setadp_promisc_mode); + +struct net_device_stats *qeth_get_stats(struct net_device *dev) +{ + struct qeth_card *card; + + card = dev->ml_priv; + + QETH_CARD_TEXT(card, 5, "getstat"); + + return &card->stats; +} +EXPORT_SYMBOL_GPL(qeth_get_stats); + +static int qeth_setadpparms_change_macaddr_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + + QETH_CARD_TEXT(card, 4, "chgmaccb"); + if (qeth_setadpparms_inspect_rc(cmd)) + return 0; + + if (!card->options.layer2 || + !(card->info.mac_bits & QETH_LAYER2_MAC_READ)) { + ether_addr_copy(card->dev->dev_addr, + cmd->data.setadapterparms.data.change_addr.addr); + card->info.mac_bits |= QETH_LAYER2_MAC_READ; + } + return 0; +} + +int qeth_setadpparms_change_macaddr(struct qeth_card *card) +{ + int rc; + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + QETH_CARD_TEXT(card, 4, "chgmac"); + + iob = qeth_get_adapter_cmd(card, IPA_SETADP_ALTER_MAC_ADDRESS, + sizeof(struct qeth_ipacmd_setadpparms_hdr) + + sizeof(struct qeth_change_addr)); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + cmd->data.setadapterparms.data.change_addr.cmd = CHANGE_ADDR_READ_MAC; + cmd->data.setadapterparms.data.change_addr.addr_size = ETH_ALEN; + ether_addr_copy(cmd->data.setadapterparms.data.change_addr.addr, + card->dev->dev_addr); + rc = qeth_send_ipa_cmd(card, iob, qeth_setadpparms_change_macaddr_cb, + NULL); + return rc; +} +EXPORT_SYMBOL_GPL(qeth_setadpparms_change_macaddr); + +static int qeth_setadpparms_set_access_ctrl_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + struct qeth_set_access_ctrl *access_ctrl_req; + int fallback = *(int *)reply->param; + + QETH_CARD_TEXT(card, 4, "setaccb"); + if (cmd->hdr.return_code) + return 0; + qeth_setadpparms_inspect_rc(cmd); + + access_ctrl_req = &cmd->data.setadapterparms.data.set_access_ctrl; + QETH_DBF_TEXT_(SETUP, 2, "setaccb"); + QETH_DBF_TEXT_(SETUP, 2, "%s", card->gdev->dev.kobj.name); + QETH_DBF_TEXT_(SETUP, 2, "rc=%d", + cmd->data.setadapterparms.hdr.return_code); + if (cmd->data.setadapterparms.hdr.return_code != + SET_ACCESS_CTRL_RC_SUCCESS) + QETH_DBF_MESSAGE(3, "ERR:SET_ACCESS_CTRL(%s,%d)==%d\n", + card->gdev->dev.kobj.name, + access_ctrl_req->subcmd_code, + cmd->data.setadapterparms.hdr.return_code); + switch (cmd->data.setadapterparms.hdr.return_code) { + case SET_ACCESS_CTRL_RC_SUCCESS: + if (card->options.isolation == ISOLATION_MODE_NONE) { + dev_info(&card->gdev->dev, + "QDIO data connection isolation is deactivated\n"); + } else { + dev_info(&card->gdev->dev, + "QDIO data connection isolation is activated\n"); + } + break; + case SET_ACCESS_CTRL_RC_ALREADY_NOT_ISOLATED: + QETH_DBF_MESSAGE(2, "%s QDIO data connection isolation already " + "deactivated\n", dev_name(&card->gdev->dev)); + if (fallback) + card->options.isolation = card->options.prev_isolation; + break; + case SET_ACCESS_CTRL_RC_ALREADY_ISOLATED: + QETH_DBF_MESSAGE(2, "%s QDIO data connection isolation already" + " activated\n", dev_name(&card->gdev->dev)); + if (fallback) + card->options.isolation = card->options.prev_isolation; + break; + case SET_ACCESS_CTRL_RC_NOT_SUPPORTED: + dev_err(&card->gdev->dev, "Adapter does not " + "support QDIO data connection isolation\n"); + break; + case SET_ACCESS_CTRL_RC_NONE_SHARED_ADAPTER: + dev_err(&card->gdev->dev, + "Adapter is dedicated. " + "QDIO data connection isolation not supported\n"); + if (fallback) + card->options.isolation = card->options.prev_isolation; + break; + case SET_ACCESS_CTRL_RC_ACTIVE_CHECKSUM_OFF: + dev_err(&card->gdev->dev, + "TSO does not permit QDIO data connection isolation\n"); + if (fallback) + card->options.isolation = card->options.prev_isolation; + break; + case SET_ACCESS_CTRL_RC_REFLREL_UNSUPPORTED: + dev_err(&card->gdev->dev, "The adjacent switch port does not " + "support reflective relay mode\n"); + if (fallback) + card->options.isolation = card->options.prev_isolation; + break; + case SET_ACCESS_CTRL_RC_REFLREL_FAILED: + dev_err(&card->gdev->dev, "The reflective relay mode cannot be " + "enabled at the adjacent switch port"); + if (fallback) + card->options.isolation = card->options.prev_isolation; + break; + case SET_ACCESS_CTRL_RC_REFLREL_DEACT_FAILED: + dev_warn(&card->gdev->dev, "Turning off reflective relay mode " + "at the adjacent switch failed\n"); + break; + default: + /* this should never happen */ + if (fallback) + card->options.isolation = card->options.prev_isolation; + break; + } + return 0; +} + +static int qeth_setadpparms_set_access_ctrl(struct qeth_card *card, + enum qeth_ipa_isolation_modes isolation, int fallback) +{ + int rc; + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + struct qeth_set_access_ctrl *access_ctrl_req; + + QETH_CARD_TEXT(card, 4, "setacctl"); + + QETH_DBF_TEXT_(SETUP, 2, "setacctl"); + QETH_DBF_TEXT_(SETUP, 2, "%s", card->gdev->dev.kobj.name); + + iob = qeth_get_adapter_cmd(card, IPA_SETADP_SET_ACCESS_CONTROL, + sizeof(struct qeth_ipacmd_setadpparms_hdr) + + sizeof(struct qeth_set_access_ctrl)); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + access_ctrl_req = &cmd->data.setadapterparms.data.set_access_ctrl; + access_ctrl_req->subcmd_code = isolation; + + rc = qeth_send_ipa_cmd(card, iob, qeth_setadpparms_set_access_ctrl_cb, + &fallback); + QETH_DBF_TEXT_(SETUP, 2, "rc=%d", rc); + return rc; +} + +int qeth_set_access_ctrl_online(struct qeth_card *card, int fallback) +{ + int rc = 0; + + QETH_CARD_TEXT(card, 4, "setactlo"); + + if ((card->info.type == QETH_CARD_TYPE_OSD || + card->info.type == QETH_CARD_TYPE_OSX) && + qeth_adp_supported(card, IPA_SETADP_SET_ACCESS_CONTROL)) { + rc = qeth_setadpparms_set_access_ctrl(card, + card->options.isolation, fallback); + if (rc) { + QETH_DBF_MESSAGE(3, + "IPA(SET_ACCESS_CTRL,%s,%d) sent failed\n", + card->gdev->dev.kobj.name, + rc); + rc = -EOPNOTSUPP; + } + } else if (card->options.isolation != ISOLATION_MODE_NONE) { + card->options.isolation = ISOLATION_MODE_NONE; + + dev_err(&card->gdev->dev, "Adapter does not " + "support QDIO data connection isolation\n"); + rc = -EOPNOTSUPP; + } + return rc; +} +EXPORT_SYMBOL_GPL(qeth_set_access_ctrl_online); + +void qeth_tx_timeout(struct net_device *dev) +{ + struct qeth_card *card; + + card = dev->ml_priv; + QETH_CARD_TEXT(card, 4, "txtimeo"); + card->stats.tx_errors++; + qeth_schedule_recovery(card); +} +EXPORT_SYMBOL_GPL(qeth_tx_timeout); + +static int qeth_mdio_read(struct net_device *dev, int phy_id, int regnum) +{ + struct qeth_card *card = dev->ml_priv; + int rc = 0; + + switch (regnum) { + case MII_BMCR: /* Basic mode control register */ + rc = BMCR_FULLDPLX; + if ((card->info.link_type != QETH_LINK_TYPE_GBIT_ETH) && + (card->info.link_type != QETH_LINK_TYPE_OSN) && + (card->info.link_type != QETH_LINK_TYPE_10GBIT_ETH)) + rc |= BMCR_SPEED100; + break; + case MII_BMSR: /* Basic mode status register */ + rc = BMSR_ERCAP | BMSR_ANEGCOMPLETE | BMSR_LSTATUS | + BMSR_10HALF | BMSR_10FULL | BMSR_100HALF | BMSR_100FULL | + BMSR_100BASE4; + break; + case MII_PHYSID1: /* PHYS ID 1 */ + rc = (dev->dev_addr[0] << 16) | (dev->dev_addr[1] << 8) | + dev->dev_addr[2]; + rc = (rc >> 5) & 0xFFFF; + break; + case MII_PHYSID2: /* PHYS ID 2 */ + rc = (dev->dev_addr[2] << 10) & 0xFFFF; + break; + case MII_ADVERTISE: /* Advertisement control reg */ + rc = ADVERTISE_ALL; + break; + case MII_LPA: /* Link partner ability reg */ + rc = LPA_10HALF | LPA_10FULL | LPA_100HALF | LPA_100FULL | + LPA_100BASE4 | LPA_LPACK; + break; + case MII_EXPANSION: /* Expansion register */ + break; + case MII_DCOUNTER: /* disconnect counter */ + break; + case MII_FCSCOUNTER: /* false carrier counter */ + break; + case MII_NWAYTEST: /* N-way auto-neg test register */ + break; + case MII_RERRCOUNTER: /* rx error counter */ + rc = card->stats.rx_errors; + break; + case MII_SREVISION: /* silicon revision */ + break; + case MII_RESV1: /* reserved 1 */ + break; + case MII_LBRERROR: /* loopback, rx, bypass error */ + break; + case MII_PHYADDR: /* physical address */ + break; + case MII_RESV2: /* reserved 2 */ + break; + case MII_TPISTATUS: /* TPI status for 10mbps */ + break; + case MII_NCONFIG: /* network interface config */ + break; + default: + break; + } + return rc; +} + +static int qeth_send_ipa_snmp_cmd(struct qeth_card *card, + struct qeth_cmd_buffer *iob, int len, + int (*reply_cb)(struct qeth_card *, struct qeth_reply *, + unsigned long), + void *reply_param) +{ + u16 s1, s2; + + QETH_CARD_TEXT(card, 4, "sendsnmp"); + + memcpy(iob->data, IPA_PDU_HEADER, IPA_PDU_HEADER_SIZE); + memcpy(QETH_IPA_CMD_DEST_ADDR(iob->data), + &card->token.ulp_connection_r, QETH_MPC_TOKEN_LENGTH); + /* adjust PDU length fields in IPA_PDU_HEADER */ + s1 = (u32) IPA_PDU_HEADER_SIZE + len; + s2 = (u32) len; + memcpy(QETH_IPA_PDU_LEN_TOTAL(iob->data), &s1, 2); + memcpy(QETH_IPA_PDU_LEN_PDU1(iob->data), &s2, 2); + memcpy(QETH_IPA_PDU_LEN_PDU2(iob->data), &s2, 2); + memcpy(QETH_IPA_PDU_LEN_PDU3(iob->data), &s2, 2); + return qeth_send_control_data(card, IPA_PDU_HEADER_SIZE + len, iob, + reply_cb, reply_param); +} + +static int qeth_snmp_command_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long sdata) +{ + struct qeth_ipa_cmd *cmd; + struct qeth_arp_query_info *qinfo; + unsigned char *data; + void *snmp_data; + __u16 data_len; + + QETH_CARD_TEXT(card, 3, "snpcmdcb"); + + cmd = (struct qeth_ipa_cmd *) sdata; + data = (unsigned char *)((char *)cmd - reply->offset); + qinfo = (struct qeth_arp_query_info *) reply->param; + + if (cmd->hdr.return_code) { + QETH_CARD_TEXT_(card, 4, "scer1%x", cmd->hdr.return_code); + return 0; + } + if (cmd->data.setadapterparms.hdr.return_code) { + cmd->hdr.return_code = + cmd->data.setadapterparms.hdr.return_code; + QETH_CARD_TEXT_(card, 4, "scer2%x", cmd->hdr.return_code); + return 0; + } + data_len = *((__u16 *)QETH_IPA_PDU_LEN_PDU1(data)); + if (cmd->data.setadapterparms.hdr.seq_no == 1) { + snmp_data = &cmd->data.setadapterparms.data.snmp; + data_len -= offsetof(struct qeth_ipa_cmd, + data.setadapterparms.data.snmp); + } else { + snmp_data = &cmd->data.setadapterparms.data.snmp.request; + data_len -= offsetof(struct qeth_ipa_cmd, + data.setadapterparms.data.snmp.request); + } + + /* check if there is enough room in userspace */ + if ((qinfo->udata_len - qinfo->udata_offset) < data_len) { + QETH_CARD_TEXT_(card, 4, "scer3%i", -ENOMEM); + cmd->hdr.return_code = IPA_RC_ENOMEM; + return 0; + } + QETH_CARD_TEXT_(card, 4, "snore%i", + cmd->data.setadapterparms.hdr.used_total); + QETH_CARD_TEXT_(card, 4, "sseqn%i", + cmd->data.setadapterparms.hdr.seq_no); + /*copy entries to user buffer*/ + memcpy(qinfo->udata + qinfo->udata_offset, snmp_data, data_len); + qinfo->udata_offset += data_len; + + /* check if all replies received ... */ + QETH_CARD_TEXT_(card, 4, "srtot%i", + cmd->data.setadapterparms.hdr.used_total); + QETH_CARD_TEXT_(card, 4, "srseq%i", + cmd->data.setadapterparms.hdr.seq_no); + if (cmd->data.setadapterparms.hdr.seq_no < + cmd->data.setadapterparms.hdr.used_total) + return 1; + return 0; +} + +static int qeth_snmp_command(struct qeth_card *card, char __user *udata) +{ + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + struct qeth_snmp_ureq *ureq; + unsigned int req_len; + struct qeth_arp_query_info qinfo = {0, }; + int rc = 0; + + QETH_CARD_TEXT(card, 3, "snmpcmd"); + + if (card->info.guestlan) + return -EOPNOTSUPP; + + if ((!qeth_adp_supported(card, IPA_SETADP_SET_SNMP_CONTROL)) && + (!card->options.layer2)) { + return -EOPNOTSUPP; + } + /* skip 4 bytes (data_len struct member) to get req_len */ + if (copy_from_user(&req_len, udata + sizeof(int), sizeof(int))) + return -EFAULT; + if (req_len > (QETH_BUFSIZE - IPA_PDU_HEADER_SIZE - + sizeof(struct qeth_ipacmd_hdr) - + sizeof(struct qeth_ipacmd_setadpparms_hdr))) + return -EINVAL; + ureq = memdup_user(udata, req_len + sizeof(struct qeth_snmp_ureq_hdr)); + if (IS_ERR(ureq)) { + QETH_CARD_TEXT(card, 2, "snmpnome"); + return PTR_ERR(ureq); + } + qinfo.udata_len = ureq->hdr.data_len; + qinfo.udata = kzalloc(qinfo.udata_len, GFP_KERNEL); + if (!qinfo.udata) { + kfree(ureq); + return -ENOMEM; + } + qinfo.udata_offset = sizeof(struct qeth_snmp_ureq_hdr); + + iob = qeth_get_adapter_cmd(card, IPA_SETADP_SET_SNMP_CONTROL, + QETH_SNMP_SETADP_CMDLENGTH + req_len); + if (!iob) { + rc = -ENOMEM; + goto out; + } + cmd = __ipa_cmd(iob); + memcpy(&cmd->data.setadapterparms.data.snmp, &ureq->cmd, req_len); + rc = qeth_send_ipa_snmp_cmd(card, iob, QETH_SETADP_BASE_LEN + req_len, + qeth_snmp_command_cb, (void *)&qinfo); + if (rc) + QETH_DBF_MESSAGE(2, "SNMP command failed on %s: (0x%x)\n", + QETH_CARD_IFNAME(card), rc); + else { + if (copy_to_user(udata, qinfo.udata, qinfo.udata_len)) + rc = -EFAULT; + } +out: + kfree(ureq); + kfree(qinfo.udata); + return rc; +} + +static int qeth_setadpparms_query_oat_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *)data; + struct qeth_qoat_priv *priv; + char *resdata; + int resdatalen; + + QETH_CARD_TEXT(card, 3, "qoatcb"); + if (qeth_setadpparms_inspect_rc(cmd)) + return 0; + + priv = (struct qeth_qoat_priv *)reply->param; + resdatalen = cmd->data.setadapterparms.hdr.cmdlength; + resdata = (char *)data + 28; + + if (resdatalen > (priv->buffer_len - priv->response_len)) { + cmd->hdr.return_code = IPA_RC_FFFF; + return 0; + } + + memcpy((priv->buffer + priv->response_len), resdata, + resdatalen); + priv->response_len += resdatalen; + + if (cmd->data.setadapterparms.hdr.seq_no < + cmd->data.setadapterparms.hdr.used_total) + return 1; + return 0; +} + +static int qeth_query_oat_command(struct qeth_card *card, char __user *udata) +{ + int rc = 0; + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + struct qeth_query_oat *oat_req; + struct qeth_query_oat_data oat_data; + struct qeth_qoat_priv priv; + void __user *tmp; + + QETH_CARD_TEXT(card, 3, "qoatcmd"); + + if (!qeth_adp_supported(card, IPA_SETADP_QUERY_OAT)) { + rc = -EOPNOTSUPP; + goto out; + } + + if (copy_from_user(&oat_data, udata, + sizeof(struct qeth_query_oat_data))) { + rc = -EFAULT; + goto out; + } + + priv.buffer_len = oat_data.buffer_len; + priv.response_len = 0; + priv.buffer = vzalloc(oat_data.buffer_len); + if (!priv.buffer) { + rc = -ENOMEM; + goto out; + } + + iob = qeth_get_adapter_cmd(card, IPA_SETADP_QUERY_OAT, + sizeof(struct qeth_ipacmd_setadpparms_hdr) + + sizeof(struct qeth_query_oat)); + if (!iob) { + rc = -ENOMEM; + goto out_free; + } + cmd = __ipa_cmd(iob); + oat_req = &cmd->data.setadapterparms.data.query_oat; + oat_req->subcmd_code = oat_data.command; + + rc = qeth_send_ipa_cmd(card, iob, qeth_setadpparms_query_oat_cb, + &priv); + if (!rc) { + if (is_compat_task()) + tmp = compat_ptr(oat_data.ptr); + else + tmp = (void __user *)(unsigned long)oat_data.ptr; + + if (copy_to_user(tmp, priv.buffer, + priv.response_len)) { + rc = -EFAULT; + goto out_free; + } + + oat_data.response_len = priv.response_len; + + if (copy_to_user(udata, &oat_data, + sizeof(struct qeth_query_oat_data))) + rc = -EFAULT; + } else + if (rc == IPA_RC_FFFF) + rc = -EFAULT; + +out_free: + vfree(priv.buffer); +out: + return rc; +} + +static int qeth_query_card_info_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct carrier_info *carrier_info = (struct carrier_info *)reply->param; + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *)data; + struct qeth_query_card_info *card_info; + + QETH_CARD_TEXT(card, 2, "qcrdincb"); + if (qeth_setadpparms_inspect_rc(cmd)) + return 0; + + card_info = &cmd->data.setadapterparms.data.card_info; + carrier_info->card_type = card_info->card_type; + carrier_info->port_mode = card_info->port_mode; + carrier_info->port_speed = card_info->port_speed; + return 0; +} + +static int qeth_query_card_info(struct qeth_card *card, + struct carrier_info *carrier_info) +{ + struct qeth_cmd_buffer *iob; + + QETH_CARD_TEXT(card, 2, "qcrdinfo"); + if (!qeth_adp_supported(card, IPA_SETADP_QUERY_CARD_INFO)) + return -EOPNOTSUPP; + iob = qeth_get_adapter_cmd(card, IPA_SETADP_QUERY_CARD_INFO, + sizeof(struct qeth_ipacmd_setadpparms_hdr)); + if (!iob) + return -ENOMEM; + return qeth_send_ipa_cmd(card, iob, qeth_query_card_info_cb, + (void *)carrier_info); +} + +/** + * qeth_vm_request_mac() - Request a hypervisor-managed MAC address + * @card: pointer to a qeth_card + * + * Returns + * 0, if a MAC address has been set for the card's netdevice + * a return code, for various error conditions + */ +int qeth_vm_request_mac(struct qeth_card *card) +{ + struct diag26c_mac_resp *response; + struct diag26c_mac_req *request; + struct ccw_dev_id id; + int rc; + + QETH_DBF_TEXT(SETUP, 2, "vmreqmac"); + + request = kzalloc(sizeof(*request), GFP_KERNEL | GFP_DMA); + response = kzalloc(sizeof(*response), GFP_KERNEL | GFP_DMA); + if (!request || !response) { + rc = -ENOMEM; + goto out; + } + + ccw_device_get_id(CARD_DDEV(card), &id); + request->resp_buf_len = sizeof(*response); + request->resp_version = DIAG26C_VERSION2; + request->op_code = DIAG26C_GET_MAC; + request->devno = id.devno; + + QETH_DBF_HEX(CTRL, 2, request, sizeof(*request)); + rc = diag26c(request, response, DIAG26C_MAC_SERVICES); + QETH_DBF_HEX(CTRL, 2, request, sizeof(*request)); + if (rc) + goto out; + QETH_DBF_HEX(CTRL, 2, response, sizeof(*response)); + + if (request->resp_buf_len < sizeof(*response) || + response->version != request->resp_version) { + rc = -EIO; + QETH_DBF_TEXT(SETUP, 2, "badresp"); + QETH_DBF_HEX(SETUP, 2, &request->resp_buf_len, + sizeof(request->resp_buf_len)); + } else if (!is_valid_ether_addr(response->mac)) { + rc = -EINVAL; + QETH_DBF_TEXT(SETUP, 2, "badmac"); + QETH_DBF_HEX(SETUP, 2, response->mac, ETH_ALEN); + } else { + ether_addr_copy(card->dev->dev_addr, response->mac); + } + +out: + kfree(response); + kfree(request); + return rc; +} +EXPORT_SYMBOL_GPL(qeth_vm_request_mac); + +static int qeth_get_qdio_q_format(struct qeth_card *card) +{ + if (card->info.type == QETH_CARD_TYPE_IQD) + return QDIO_IQDIO_QFMT; + else + return QDIO_QETH_QFMT; +} + +static void qeth_determine_capabilities(struct qeth_card *card) +{ + int rc; + int length; + char *prcd; + struct ccw_device *ddev; + int ddev_offline = 0; + + QETH_DBF_TEXT(SETUP, 2, "detcapab"); + ddev = CARD_DDEV(card); + if (!ddev->online) { + ddev_offline = 1; + rc = ccw_device_set_online(ddev); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "3err%d", rc); + goto out; + } + } + + rc = qeth_read_conf_data(card, (void **) &prcd, &length); + if (rc) { + QETH_DBF_MESSAGE(2, "%s qeth_read_conf_data returned %i\n", + dev_name(&card->gdev->dev), rc); + QETH_DBF_TEXT_(SETUP, 2, "5err%d", rc); + goto out_offline; + } + qeth_configure_unitaddr(card, prcd); + if (ddev_offline) + qeth_configure_blkt_default(card, prcd); + kfree(prcd); + + rc = qdio_get_ssqd_desc(ddev, &card->ssqd); + if (rc) + QETH_DBF_TEXT_(SETUP, 2, "6err%d", rc); + + QETH_DBF_TEXT_(SETUP, 2, "qfmt%d", card->ssqd.qfmt); + QETH_DBF_TEXT_(SETUP, 2, "ac1:%02x", card->ssqd.qdioac1); + QETH_DBF_TEXT_(SETUP, 2, "ac2:%04x", card->ssqd.qdioac2); + QETH_DBF_TEXT_(SETUP, 2, "ac3:%04x", card->ssqd.qdioac3); + QETH_DBF_TEXT_(SETUP, 2, "icnt%d", card->ssqd.icnt); + if (!((card->ssqd.qfmt != QDIO_IQDIO_QFMT) || + ((card->ssqd.qdioac1 & CHSC_AC1_INITIATE_INPUTQ) == 0) || + ((card->ssqd.qdioac3 & CHSC_AC3_FORMAT2_CQ_AVAILABLE) == 0))) { + dev_info(&card->gdev->dev, + "Completion Queueing supported\n"); + } else { + card->options.cq = QETH_CQ_NOTAVAILABLE; + } + + +out_offline: + if (ddev_offline == 1) + ccw_device_set_offline(ddev); +out: + return; +} + +static void qeth_qdio_establish_cq(struct qeth_card *card, + struct qdio_buffer **in_sbal_ptrs, + void (**queue_start_poll) + (struct ccw_device *, int, + unsigned long)) +{ + int i; + + if (card->options.cq == QETH_CQ_ENABLED) { + int offset = QDIO_MAX_BUFFERS_PER_Q * + (card->qdio.no_in_queues - 1); + + for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) + in_sbal_ptrs[offset + i] = + card->qdio.c_q->bufs[i].buffer; + + queue_start_poll[card->qdio.no_in_queues - 1] = NULL; + } +} + +static int qeth_qdio_establish(struct qeth_card *card) +{ + struct qdio_initialize init_data; + char *qib_param_field; + struct qdio_buffer **in_sbal_ptrs; + void (**queue_start_poll) (struct ccw_device *, int, unsigned long); + struct qdio_buffer **out_sbal_ptrs; + int i, j, k; + int rc = 0; + + QETH_DBF_TEXT(SETUP, 2, "qdioest"); + + qib_param_field = kzalloc(QDIO_MAX_BUFFERS_PER_Q, + GFP_KERNEL); + if (!qib_param_field) { + rc = -ENOMEM; + goto out_free_nothing; + } + + qeth_create_qib_param_field(card, qib_param_field); + qeth_create_qib_param_field_blkt(card, qib_param_field); + + in_sbal_ptrs = kcalloc(card->qdio.no_in_queues * QDIO_MAX_BUFFERS_PER_Q, + sizeof(void *), + GFP_KERNEL); + if (!in_sbal_ptrs) { + rc = -ENOMEM; + goto out_free_qib_param; + } + + for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) + in_sbal_ptrs[i] = card->qdio.in_q->bufs[i].buffer; + + queue_start_poll = kcalloc(card->qdio.no_in_queues, sizeof(void *), + GFP_KERNEL); + if (!queue_start_poll) { + rc = -ENOMEM; + goto out_free_in_sbals; + } + for (i = 0; i < card->qdio.no_in_queues; ++i) + queue_start_poll[i] = qeth_qdio_start_poll; + + qeth_qdio_establish_cq(card, in_sbal_ptrs, queue_start_poll); + + out_sbal_ptrs = + kcalloc(card->qdio.no_out_queues * QDIO_MAX_BUFFERS_PER_Q, + sizeof(void *), + GFP_KERNEL); + if (!out_sbal_ptrs) { + rc = -ENOMEM; + goto out_free_queue_start_poll; + } + + for (i = 0, k = 0; i < card->qdio.no_out_queues; ++i) + for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++, k++) + out_sbal_ptrs[k] = + card->qdio.out_qs[i]->bufs[j]->buffer; + + memset(&init_data, 0, sizeof(struct qdio_initialize)); + init_data.cdev = CARD_DDEV(card); + init_data.q_format = qeth_get_qdio_q_format(card); + init_data.qib_param_field_format = 0; + init_data.qib_param_field = qib_param_field; + init_data.no_input_qs = card->qdio.no_in_queues; + init_data.no_output_qs = card->qdio.no_out_queues; + init_data.input_handler = qeth_qdio_input_handler; + init_data.output_handler = qeth_qdio_output_handler; + init_data.queue_start_poll_array = queue_start_poll; + init_data.int_parm = (unsigned long) card; + init_data.input_sbal_addr_array = (void **) in_sbal_ptrs; + init_data.output_sbal_addr_array = (void **) out_sbal_ptrs; + init_data.output_sbal_state_array = card->qdio.out_bufstates; + init_data.scan_threshold = + (card->info.type == QETH_CARD_TYPE_IQD) ? 1 : 32; + + if (atomic_cmpxchg(&card->qdio.state, QETH_QDIO_ALLOCATED, + QETH_QDIO_ESTABLISHED) == QETH_QDIO_ALLOCATED) { + rc = qdio_allocate(&init_data); + if (rc) { + atomic_set(&card->qdio.state, QETH_QDIO_ALLOCATED); + goto out; + } + rc = qdio_establish(&init_data); + if (rc) { + atomic_set(&card->qdio.state, QETH_QDIO_ALLOCATED); + qdio_free(CARD_DDEV(card)); + } + } + + switch (card->options.cq) { + case QETH_CQ_ENABLED: + dev_info(&card->gdev->dev, "Completion Queue support enabled"); + break; + case QETH_CQ_DISABLED: + dev_info(&card->gdev->dev, "Completion Queue support disabled"); + break; + default: + break; + } +out: + kfree(out_sbal_ptrs); +out_free_queue_start_poll: + kfree(queue_start_poll); +out_free_in_sbals: + kfree(in_sbal_ptrs); +out_free_qib_param: + kfree(qib_param_field); +out_free_nothing: + return rc; +} + +static void qeth_core_free_card(struct qeth_card *card) +{ + QETH_DBF_TEXT(SETUP, 2, "freecrd"); + QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *)); + qeth_clean_channel(&card->read); + qeth_clean_channel(&card->write); + qeth_clean_channel(&card->data); + qeth_free_qdio_buffers(card); + unregister_service_level(&card->qeth_service_level); + kfree(card); +} + +void qeth_trace_features(struct qeth_card *card) +{ + QETH_CARD_TEXT(card, 2, "features"); + QETH_CARD_HEX(card, 2, &card->options.ipa4, sizeof(card->options.ipa4)); + QETH_CARD_HEX(card, 2, &card->options.ipa6, sizeof(card->options.ipa6)); + QETH_CARD_HEX(card, 2, &card->options.adp, sizeof(card->options.adp)); + QETH_CARD_HEX(card, 2, &card->info.diagass_support, + sizeof(card->info.diagass_support)); +} +EXPORT_SYMBOL_GPL(qeth_trace_features); + +static struct ccw_device_id qeth_ids[] = { + {CCW_DEVICE_DEVTYPE(0x1731, 0x01, 0x1732, 0x01), + .driver_info = QETH_CARD_TYPE_OSD}, + {CCW_DEVICE_DEVTYPE(0x1731, 0x05, 0x1732, 0x05), + .driver_info = QETH_CARD_TYPE_IQD}, + {CCW_DEVICE_DEVTYPE(0x1731, 0x06, 0x1732, 0x06), + .driver_info = QETH_CARD_TYPE_OSN}, + {CCW_DEVICE_DEVTYPE(0x1731, 0x02, 0x1732, 0x03), + .driver_info = QETH_CARD_TYPE_OSM}, + {CCW_DEVICE_DEVTYPE(0x1731, 0x02, 0x1732, 0x02), + .driver_info = QETH_CARD_TYPE_OSX}, + {}, +}; +MODULE_DEVICE_TABLE(ccw, qeth_ids); + +static struct ccw_driver qeth_ccw_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "qeth", + }, + .ids = qeth_ids, + .probe = ccwgroup_probe_ccwdev, + .remove = ccwgroup_remove_ccwdev, +}; + +int qeth_core_hardsetup_card(struct qeth_card *card) +{ + int retries = 3; + int rc; + + QETH_DBF_TEXT(SETUP, 2, "hrdsetup"); + atomic_set(&card->force_alloc_skb, 0); + rc = qeth_update_from_chp_desc(card); + if (rc) + return rc; +retry: + if (retries < 3) + QETH_DBF_MESSAGE(2, "%s Retrying to do IDX activates.\n", + dev_name(&card->gdev->dev)); + rc = qeth_qdio_clear_card(card, card->info.type != QETH_CARD_TYPE_IQD); + ccw_device_set_offline(CARD_DDEV(card)); + ccw_device_set_offline(CARD_WDEV(card)); + ccw_device_set_offline(CARD_RDEV(card)); + qdio_free(CARD_DDEV(card)); + rc = ccw_device_set_online(CARD_RDEV(card)); + if (rc) + goto retriable; + rc = ccw_device_set_online(CARD_WDEV(card)); + if (rc) + goto retriable; + rc = ccw_device_set_online(CARD_DDEV(card)); + if (rc) + goto retriable; +retriable: + if (rc == -ERESTARTSYS) { + QETH_DBF_TEXT(SETUP, 2, "break1"); + return rc; + } else if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "1err%d", rc); + if (--retries < 0) + goto out; + else + goto retry; + } + qeth_determine_capabilities(card); + qeth_init_tokens(card); + qeth_init_func_level(card); + rc = qeth_idx_activate_channel(&card->read, qeth_idx_read_cb); + if (rc == -ERESTARTSYS) { + QETH_DBF_TEXT(SETUP, 2, "break2"); + return rc; + } else if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "3err%d", rc); + if (--retries < 0) + goto out; + else + goto retry; + } + rc = qeth_idx_activate_channel(&card->write, qeth_idx_write_cb); + if (rc == -ERESTARTSYS) { + QETH_DBF_TEXT(SETUP, 2, "break3"); + return rc; + } else if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "4err%d", rc); + if (--retries < 0) + goto out; + else + goto retry; + } + card->read_or_write_problem = 0; + rc = qeth_mpc_initialize(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "5err%d", rc); + goto out; + } + + rc = qeth_send_startlan(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "6err%d", rc); + if (rc == IPA_RC_LAN_OFFLINE) { + dev_warn(&card->gdev->dev, + "The LAN is offline\n"); + card->lan_online = 0; + } else { + rc = -ENODEV; + goto out; + } + } else + card->lan_online = 1; + + card->options.ipa4.supported_funcs = 0; + card->options.ipa6.supported_funcs = 0; + card->options.adp.supported_funcs = 0; + card->options.sbp.supported_funcs = 0; + card->info.diagass_support = 0; + rc = qeth_query_ipassists(card, QETH_PROT_IPV4); + if (rc == -ENOMEM) + goto out; + if (qeth_is_supported(card, IPA_IPV6)) { + rc = qeth_query_ipassists(card, QETH_PROT_IPV6); + if (rc == -ENOMEM) + goto out; + } + if (qeth_is_supported(card, IPA_SETADAPTERPARMS)) { + rc = qeth_query_setadapterparms(card); + if (rc < 0) { + QETH_DBF_TEXT_(SETUP, 2, "7err%d", rc); + goto out; + } + } + if (qeth_adp_supported(card, IPA_SETADP_SET_DIAG_ASSIST)) { + rc = qeth_query_setdiagass(card); + if (rc < 0) { + QETH_DBF_TEXT_(SETUP, 2, "8err%d", rc); + goto out; + } + } + return 0; +out: + dev_warn(&card->gdev->dev, "The qeth device driver failed to recover " + "an error on the device\n"); + QETH_DBF_MESSAGE(2, "%s Initialization in hardsetup failed! rc=%d\n", + dev_name(&card->gdev->dev), rc); + return rc; +} +EXPORT_SYMBOL_GPL(qeth_core_hardsetup_card); + +static void qeth_create_skb_frag(struct qdio_buffer_element *element, + struct sk_buff *skb, int offset, int data_len) +{ + struct page *page = virt_to_page(element->addr); + unsigned int next_frag; + + /* first fill the linear space */ + if (!skb->len) { + unsigned int linear = min(data_len, skb_tailroom(skb)); + + skb_put_data(skb, element->addr + offset, linear); + data_len -= linear; + if (!data_len) + return; + offset += linear; + /* fall through to add page frag for remaining data */ + } + + next_frag = skb_shinfo(skb)->nr_frags; + get_page(page); + skb_add_rx_frag(skb, next_frag, page, offset, data_len, data_len); +} + +static inline int qeth_is_last_sbale(struct qdio_buffer_element *sbale) +{ + return (sbale->eflags & SBAL_EFLAGS_LAST_ENTRY); +} + +struct sk_buff *qeth_core_get_next_skb(struct qeth_card *card, + struct qeth_qdio_buffer *qethbuffer, + struct qdio_buffer_element **__element, int *__offset, + struct qeth_hdr **hdr) +{ + struct qdio_buffer_element *element = *__element; + struct qdio_buffer *buffer = qethbuffer->buffer; + int offset = *__offset; + struct sk_buff *skb; + int skb_len = 0; + void *data_ptr; + int data_len; + int headroom = 0; + int use_rx_sg = 0; + + /* qeth_hdr must not cross element boundaries */ + while (element->length < offset + sizeof(struct qeth_hdr)) { + if (qeth_is_last_sbale(element)) + return NULL; + element++; + offset = 0; + } + *hdr = element->addr + offset; + + offset += sizeof(struct qeth_hdr); + switch ((*hdr)->hdr.l2.id) { + case QETH_HEADER_TYPE_LAYER2: + skb_len = (*hdr)->hdr.l2.pkt_length; + break; + case QETH_HEADER_TYPE_LAYER3: + skb_len = (*hdr)->hdr.l3.length; + headroom = ETH_HLEN; + break; + case QETH_HEADER_TYPE_OSN: + skb_len = (*hdr)->hdr.osn.pdu_length; + headroom = sizeof(struct qeth_hdr); + break; + default: + break; + } + + if (!skb_len) + return NULL; + + if (((skb_len >= card->options.rx_sg_cb) && + (!(card->info.type == QETH_CARD_TYPE_OSN)) && + (!atomic_read(&card->force_alloc_skb))) || + (card->options.cq == QETH_CQ_ENABLED)) + use_rx_sg = 1; + + if (use_rx_sg && qethbuffer->rx_skb) { + /* QETH_CQ_ENABLED only: */ + skb = qethbuffer->rx_skb; + qethbuffer->rx_skb = NULL; + } else { + unsigned int linear = (use_rx_sg) ? QETH_RX_PULL_LEN : skb_len; + + skb = napi_alloc_skb(&card->napi, linear + headroom); + } + if (!skb) + goto no_mem; + if (headroom) + skb_reserve(skb, headroom); + + data_ptr = element->addr + offset; + while (skb_len) { + data_len = min(skb_len, (int)(element->length - offset)); + if (data_len) { + if (use_rx_sg) + qeth_create_skb_frag(element, skb, offset, + data_len); + else + skb_put_data(skb, data_ptr, data_len); + } + skb_len -= data_len; + if (skb_len) { + if (qeth_is_last_sbale(element)) { + QETH_CARD_TEXT(card, 4, "unexeob"); + QETH_CARD_HEX(card, 2, buffer, sizeof(void *)); + dev_kfree_skb_any(skb); + card->stats.rx_errors++; + return NULL; + } + element++; + offset = 0; + data_ptr = element->addr; + } else { + offset += data_len; + } + } + *__element = element; + *__offset = offset; + if (use_rx_sg && card->options.performance_stats) { + card->perf_stats.sg_skbs_rx++; + card->perf_stats.sg_frags_rx += skb_shinfo(skb)->nr_frags; + } + return skb; +no_mem: + if (net_ratelimit()) { + QETH_CARD_TEXT(card, 2, "noskbmem"); + } + card->stats.rx_dropped++; + return NULL; +} +EXPORT_SYMBOL_GPL(qeth_core_get_next_skb); + +int qeth_poll(struct napi_struct *napi, int budget) +{ + struct qeth_card *card = container_of(napi, struct qeth_card, napi); + int work_done = 0; + struct qeth_qdio_buffer *buffer; + int done; + int new_budget = budget; + + if (card->options.performance_stats) { + card->perf_stats.inbound_cnt++; + card->perf_stats.inbound_start_time = qeth_get_micros(); + } + + while (1) { + if (!card->rx.b_count) { + card->rx.qdio_err = 0; + card->rx.b_count = qdio_get_next_buffers( + card->data.ccwdev, 0, &card->rx.b_index, + &card->rx.qdio_err); + if (card->rx.b_count <= 0) { + card->rx.b_count = 0; + break; + } + card->rx.b_element = + &card->qdio.in_q->bufs[card->rx.b_index] + .buffer->element[0]; + card->rx.e_offset = 0; + } + + while (card->rx.b_count) { + buffer = &card->qdio.in_q->bufs[card->rx.b_index]; + if (!(card->rx.qdio_err && + qeth_check_qdio_errors(card, buffer->buffer, + card->rx.qdio_err, "qinerr"))) + work_done += + card->discipline->process_rx_buffer( + card, new_budget, &done); + else + done = 1; + + if (done) { + if (card->options.performance_stats) + card->perf_stats.bufs_rec++; + qeth_put_buffer_pool_entry(card, + buffer->pool_entry); + qeth_queue_input_buffer(card, card->rx.b_index); + card->rx.b_count--; + if (card->rx.b_count) { + card->rx.b_index = + (card->rx.b_index + 1) % + QDIO_MAX_BUFFERS_PER_Q; + card->rx.b_element = + &card->qdio.in_q + ->bufs[card->rx.b_index] + .buffer->element[0]; + card->rx.e_offset = 0; + } + } + + if (work_done >= budget) + goto out; + else + new_budget = budget - work_done; + } + } + + napi_complete_done(napi, work_done); + if (qdio_start_irq(card->data.ccwdev, 0)) + napi_schedule(&card->napi); +out: + if (card->options.performance_stats) + card->perf_stats.inbound_time += qeth_get_micros() - + card->perf_stats.inbound_start_time; + return work_done; +} +EXPORT_SYMBOL_GPL(qeth_poll); + +static int qeth_setassparms_inspect_rc(struct qeth_ipa_cmd *cmd) +{ + if (!cmd->hdr.return_code) + cmd->hdr.return_code = cmd->data.setassparms.hdr.return_code; + return cmd->hdr.return_code; +} + +int qeth_setassparms_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd; + + QETH_CARD_TEXT(card, 4, "defadpcb"); + + cmd = (struct qeth_ipa_cmd *) data; + if (cmd->hdr.return_code == 0) { + cmd->hdr.return_code = cmd->data.setassparms.hdr.return_code; + if (cmd->hdr.prot_version == QETH_PROT_IPV4) + card->options.ipa4.enabled_funcs = cmd->hdr.ipa_enabled; + if (cmd->hdr.prot_version == QETH_PROT_IPV6) + card->options.ipa6.enabled_funcs = cmd->hdr.ipa_enabled; + } + return 0; +} +EXPORT_SYMBOL_GPL(qeth_setassparms_cb); + +struct qeth_cmd_buffer *qeth_get_setassparms_cmd(struct qeth_card *card, + enum qeth_ipa_funcs ipa_func, + __u16 cmd_code, __u16 len, + enum qeth_prot_versions prot) +{ + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + QETH_CARD_TEXT(card, 4, "getasscm"); + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_SETASSPARMS, prot); + + if (iob) { + cmd = __ipa_cmd(iob); + cmd->data.setassparms.hdr.assist_no = ipa_func; + cmd->data.setassparms.hdr.length = 8 + len; + cmd->data.setassparms.hdr.command_code = cmd_code; + cmd->data.setassparms.hdr.return_code = 0; + cmd->data.setassparms.hdr.seq_no = 0; + } + + return iob; +} +EXPORT_SYMBOL_GPL(qeth_get_setassparms_cmd); + +int qeth_send_setassparms(struct qeth_card *card, + struct qeth_cmd_buffer *iob, __u16 len, long data, + int (*reply_cb)(struct qeth_card *, + struct qeth_reply *, unsigned long), + void *reply_param) +{ + int rc; + struct qeth_ipa_cmd *cmd; + + QETH_CARD_TEXT(card, 4, "sendassp"); + + cmd = __ipa_cmd(iob); + if (len <= sizeof(__u32)) + cmd->data.setassparms.data.flags_32bit = (__u32) data; + else /* (len > sizeof(__u32)) */ + memcpy(&cmd->data.setassparms.data, (void *) data, len); + + rc = qeth_send_ipa_cmd(card, iob, reply_cb, reply_param); + return rc; +} +EXPORT_SYMBOL_GPL(qeth_send_setassparms); + +int qeth_send_simple_setassparms_prot(struct qeth_card *card, + enum qeth_ipa_funcs ipa_func, + u16 cmd_code, long data, + enum qeth_prot_versions prot) +{ + int rc; + int length = 0; + struct qeth_cmd_buffer *iob; + + QETH_CARD_TEXT_(card, 4, "simassp%i", prot); + if (data) + length = sizeof(__u32); + iob = qeth_get_setassparms_cmd(card, ipa_func, cmd_code, length, prot); + if (!iob) + return -ENOMEM; + rc = qeth_send_setassparms(card, iob, length, data, + qeth_setassparms_cb, NULL); + return rc; +} +EXPORT_SYMBOL_GPL(qeth_send_simple_setassparms_prot); + +static void qeth_unregister_dbf_views(void) +{ + int x; + for (x = 0; x < QETH_DBF_INFOS; x++) { + debug_unregister(qeth_dbf[x].id); + qeth_dbf[x].id = NULL; + } +} + +void qeth_dbf_longtext(debug_info_t *id, int level, char *fmt, ...) +{ + char dbf_txt_buf[32]; + va_list args; + + if (!debug_level_enabled(id, level)) + return; + va_start(args, fmt); + vsnprintf(dbf_txt_buf, sizeof(dbf_txt_buf), fmt, args); + va_end(args); + debug_text_event(id, level, dbf_txt_buf); +} +EXPORT_SYMBOL_GPL(qeth_dbf_longtext); + +static int qeth_register_dbf_views(void) +{ + int ret; + int x; + + for (x = 0; x < QETH_DBF_INFOS; x++) { + /* register the areas */ + qeth_dbf[x].id = debug_register(qeth_dbf[x].name, + qeth_dbf[x].pages, + qeth_dbf[x].areas, + qeth_dbf[x].len); + if (qeth_dbf[x].id == NULL) { + qeth_unregister_dbf_views(); + return -ENOMEM; + } + + /* register a view */ + ret = debug_register_view(qeth_dbf[x].id, qeth_dbf[x].view); + if (ret) { + qeth_unregister_dbf_views(); + return ret; + } + + /* set a passing level */ + debug_set_level(qeth_dbf[x].id, qeth_dbf[x].level); + } + + return 0; +} + +int qeth_core_load_discipline(struct qeth_card *card, + enum qeth_discipline_id discipline) +{ + int rc = 0; + + mutex_lock(&qeth_mod_mutex); + switch (discipline) { + case QETH_DISCIPLINE_LAYER3: + card->discipline = try_then_request_module( + symbol_get(qeth_l3_discipline), "qeth_l3"); + break; + case QETH_DISCIPLINE_LAYER2: + card->discipline = try_then_request_module( + symbol_get(qeth_l2_discipline), "qeth_l2"); + break; + default: + break; + } + + if (!card->discipline) { + dev_err(&card->gdev->dev, "There is no kernel module to " + "support discipline %d\n", discipline); + rc = -EINVAL; + } + mutex_unlock(&qeth_mod_mutex); + return rc; +} + +void qeth_core_free_discipline(struct qeth_card *card) +{ + if (card->options.layer2) + symbol_put(qeth_l2_discipline); + else + symbol_put(qeth_l3_discipline); + card->discipline = NULL; +} + +const struct device_type qeth_generic_devtype = { + .name = "qeth_generic", + .groups = qeth_generic_attr_groups, +}; +EXPORT_SYMBOL_GPL(qeth_generic_devtype); + +static const struct device_type qeth_osn_devtype = { + .name = "qeth_osn", + .groups = qeth_osn_attr_groups, +}; + +#define DBF_NAME_LEN 20 + +struct qeth_dbf_entry { + char dbf_name[DBF_NAME_LEN]; + debug_info_t *dbf_info; + struct list_head dbf_list; +}; + +static LIST_HEAD(qeth_dbf_list); +static DEFINE_MUTEX(qeth_dbf_list_mutex); + +static debug_info_t *qeth_get_dbf_entry(char *name) +{ + struct qeth_dbf_entry *entry; + debug_info_t *rc = NULL; + + mutex_lock(&qeth_dbf_list_mutex); + list_for_each_entry(entry, &qeth_dbf_list, dbf_list) { + if (strcmp(entry->dbf_name, name) == 0) { + rc = entry->dbf_info; + break; + } + } + mutex_unlock(&qeth_dbf_list_mutex); + return rc; +} + +static int qeth_add_dbf_entry(struct qeth_card *card, char *name) +{ + struct qeth_dbf_entry *new_entry; + + card->debug = debug_register(name, 2, 1, 8); + if (!card->debug) { + QETH_DBF_TEXT_(SETUP, 2, "%s", "qcdbf"); + goto err; + } + if (debug_register_view(card->debug, &debug_hex_ascii_view)) + goto err_dbg; + new_entry = kzalloc(sizeof(struct qeth_dbf_entry), GFP_KERNEL); + if (!new_entry) + goto err_dbg; + strncpy(new_entry->dbf_name, name, DBF_NAME_LEN); + new_entry->dbf_info = card->debug; + mutex_lock(&qeth_dbf_list_mutex); + list_add(&new_entry->dbf_list, &qeth_dbf_list); + mutex_unlock(&qeth_dbf_list_mutex); + + return 0; + +err_dbg: + debug_unregister(card->debug); +err: + return -ENOMEM; +} + +static void qeth_clear_dbf_list(void) +{ + struct qeth_dbf_entry *entry, *tmp; + + mutex_lock(&qeth_dbf_list_mutex); + list_for_each_entry_safe(entry, tmp, &qeth_dbf_list, dbf_list) { + list_del(&entry->dbf_list); + debug_unregister(entry->dbf_info); + kfree(entry); + } + mutex_unlock(&qeth_dbf_list_mutex); +} + +static struct net_device *qeth_alloc_netdev(struct qeth_card *card) +{ + struct net_device *dev; + + switch (card->info.type) { + case QETH_CARD_TYPE_IQD: + dev = alloc_netdev(0, "hsi%d", NET_NAME_UNKNOWN, ether_setup); + break; + case QETH_CARD_TYPE_OSN: + dev = alloc_netdev(0, "osn%d", NET_NAME_UNKNOWN, ether_setup); + break; + default: + dev = alloc_etherdev(0); + } + + if (!dev) + return NULL; + + dev->ml_priv = card; + dev->watchdog_timeo = QETH_TX_TIMEOUT; + dev->min_mtu = IS_OSN(card) ? 64 : 576; + /* initialized when device first goes online: */ + dev->max_mtu = 0; + dev->mtu = 0; + SET_NETDEV_DEV(dev, &card->gdev->dev); + netif_carrier_off(dev); + + if (!IS_OSN(card)) { + dev->priv_flags &= ~IFF_TX_SKB_SHARING; + dev->hw_features |= NETIF_F_SG; + dev->vlan_features |= NETIF_F_SG; + if (IS_IQD(card)) + dev->features |= NETIF_F_SG; + } + + return dev; +} + +struct net_device *qeth_clone_netdev(struct net_device *orig) +{ + struct net_device *clone = qeth_alloc_netdev(orig->ml_priv); + + if (!clone) + return NULL; + + clone->dev_port = orig->dev_port; + return clone; +} + +static int qeth_core_probe_device(struct ccwgroup_device *gdev) +{ + struct qeth_card *card; + struct device *dev; + int rc; + enum qeth_discipline_id enforced_disc; + unsigned long flags; + char dbf_name[DBF_NAME_LEN]; + + QETH_DBF_TEXT(SETUP, 2, "probedev"); + + dev = &gdev->dev; + if (!get_device(dev)) + return -ENODEV; + + QETH_DBF_TEXT_(SETUP, 2, "%s", dev_name(&gdev->dev)); + + card = qeth_alloc_card(gdev); + if (!card) { + QETH_DBF_TEXT_(SETUP, 2, "1err%d", -ENOMEM); + rc = -ENOMEM; + goto err_dev; + } + + snprintf(dbf_name, sizeof(dbf_name), "qeth_card_%s", + dev_name(&gdev->dev)); + card->debug = qeth_get_dbf_entry(dbf_name); + if (!card->debug) { + rc = qeth_add_dbf_entry(card, dbf_name); + if (rc) + goto err_card; + } + + dev_set_drvdata(&gdev->dev, card); + qeth_setup_card(card); + rc = qeth_update_from_chp_desc(card); + if (rc) + goto err_chp_desc; + + card->dev = qeth_alloc_netdev(card); + if (!card->dev) { + rc = -ENOMEM; + goto err_card; + } + + qeth_determine_capabilities(card); + enforced_disc = qeth_enforce_discipline(card); + switch (enforced_disc) { + case QETH_DISCIPLINE_UNDETERMINED: + gdev->dev.type = &qeth_generic_devtype; + break; + default: + card->info.layer_enforced = true; + rc = qeth_core_load_discipline(card, enforced_disc); + if (rc) + goto err_load; + + gdev->dev.type = (card->info.type != QETH_CARD_TYPE_OSN) + ? card->discipline->devtype + : &qeth_osn_devtype; + rc = card->discipline->setup(card->gdev); + if (rc) + goto err_disc; + break; + } + + write_lock_irqsave(&qeth_core_card_list.rwlock, flags); + list_add_tail(&card->list, &qeth_core_card_list.list); + write_unlock_irqrestore(&qeth_core_card_list.rwlock, flags); + return 0; + +err_disc: + qeth_core_free_discipline(card); +err_load: + free_netdev(card->dev); +err_chp_desc: +err_card: + qeth_core_free_card(card); +err_dev: + put_device(dev); + return rc; +} + +static void qeth_core_remove_device(struct ccwgroup_device *gdev) +{ + unsigned long flags; + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + + QETH_DBF_TEXT(SETUP, 2, "removedv"); + + if (card->discipline) { + card->discipline->remove(gdev); + qeth_core_free_discipline(card); + } + + write_lock_irqsave(&qeth_core_card_list.rwlock, flags); + list_del(&card->list); + write_unlock_irqrestore(&qeth_core_card_list.rwlock, flags); + free_netdev(card->dev); + qeth_core_free_card(card); + dev_set_drvdata(&gdev->dev, NULL); + put_device(&gdev->dev); +} + +static int qeth_core_set_online(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + int rc = 0; + enum qeth_discipline_id def_discipline; + + if (!card->discipline) { + if (card->info.type == QETH_CARD_TYPE_IQD) + def_discipline = QETH_DISCIPLINE_LAYER3; + else + def_discipline = QETH_DISCIPLINE_LAYER2; + rc = qeth_core_load_discipline(card, def_discipline); + if (rc) + goto err; + rc = card->discipline->setup(card->gdev); + if (rc) { + qeth_core_free_discipline(card); + goto err; + } + } + rc = card->discipline->set_online(gdev); +err: + return rc; +} + +static int qeth_core_set_offline(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + return card->discipline->set_offline(gdev); +} + +static void qeth_core_shutdown(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + qeth_set_allowed_threads(card, 0, 1); + if ((gdev->state == CCWGROUP_ONLINE) && card->info.hwtrap) + qeth_hw_trap(card, QETH_DIAGS_TRAP_DISARM); + qeth_qdio_clear_card(card, 0); + qeth_clear_qdio_buffers(card); + qdio_free(CARD_DDEV(card)); +} + +static int qeth_core_freeze(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + if (card->discipline && card->discipline->freeze) + return card->discipline->freeze(gdev); + return 0; +} + +static int qeth_core_thaw(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + if (card->discipline && card->discipline->thaw) + return card->discipline->thaw(gdev); + return 0; +} + +static int qeth_core_restore(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + if (card->discipline && card->discipline->restore) + return card->discipline->restore(gdev); + return 0; +} + +static ssize_t group_store(struct device_driver *ddrv, const char *buf, + size_t count) +{ + int err; + + err = ccwgroup_create_dev(qeth_core_root_dev, to_ccwgroupdrv(ddrv), 3, + buf); + + return err ? err : count; +} +static DRIVER_ATTR_WO(group); + +static struct attribute *qeth_drv_attrs[] = { + &driver_attr_group.attr, + NULL, +}; +static struct attribute_group qeth_drv_attr_group = { + .attrs = qeth_drv_attrs, +}; +static const struct attribute_group *qeth_drv_attr_groups[] = { + &qeth_drv_attr_group, + NULL, +}; + +static struct ccwgroup_driver qeth_core_ccwgroup_driver = { + .driver = { + .groups = qeth_drv_attr_groups, + .owner = THIS_MODULE, + .name = "qeth", + }, + .ccw_driver = &qeth_ccw_driver, + .setup = qeth_core_probe_device, + .remove = qeth_core_remove_device, + .set_online = qeth_core_set_online, + .set_offline = qeth_core_set_offline, + .shutdown = qeth_core_shutdown, + .prepare = NULL, + .complete = NULL, + .freeze = qeth_core_freeze, + .thaw = qeth_core_thaw, + .restore = qeth_core_restore, +}; + +int qeth_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) +{ + struct qeth_card *card = dev->ml_priv; + struct mii_ioctl_data *mii_data; + int rc = 0; + + if (!card) + return -ENODEV; + + if (!qeth_card_hw_is_reachable(card)) + return -ENODEV; + + if (card->info.type == QETH_CARD_TYPE_OSN) + return -EPERM; + + switch (cmd) { + case SIOC_QETH_ADP_SET_SNMP_CONTROL: + rc = qeth_snmp_command(card, rq->ifr_ifru.ifru_data); + break; + case SIOC_QETH_GET_CARD_TYPE: + if ((card->info.type == QETH_CARD_TYPE_OSD || + card->info.type == QETH_CARD_TYPE_OSM || + card->info.type == QETH_CARD_TYPE_OSX) && + !card->info.guestlan) + return 1; + else + return 0; + case SIOCGMIIPHY: + mii_data = if_mii(rq); + mii_data->phy_id = 0; + break; + case SIOCGMIIREG: + mii_data = if_mii(rq); + if (mii_data->phy_id != 0) + rc = -EINVAL; + else + mii_data->val_out = qeth_mdio_read(dev, + mii_data->phy_id, mii_data->reg_num); + break; + case SIOC_QETH_QUERY_OAT: + rc = qeth_query_oat_command(card, rq->ifr_ifru.ifru_data); + break; + default: + if (card->discipline->do_ioctl) + rc = card->discipline->do_ioctl(dev, rq, cmd); + else + rc = -EOPNOTSUPP; + } + if (rc) + QETH_CARD_TEXT_(card, 2, "ioce%x", rc); + return rc; +} +EXPORT_SYMBOL_GPL(qeth_do_ioctl); + +static struct { + const char str[ETH_GSTRING_LEN]; +} qeth_ethtool_stats_keys[] = { +/* 0 */{"rx skbs"}, + {"rx buffers"}, + {"tx skbs"}, + {"tx buffers"}, + {"tx skbs no packing"}, + {"tx buffers no packing"}, + {"tx skbs packing"}, + {"tx buffers packing"}, + {"tx sg skbs"}, + {"tx buffer elements"}, +/* 10 */{"rx sg skbs"}, + {"rx sg frags"}, + {"rx sg page allocs"}, + {"tx large kbytes"}, + {"tx large count"}, + {"tx pk state ch n->p"}, + {"tx pk state ch p->n"}, + {"tx pk watermark low"}, + {"tx pk watermark high"}, + {"queue 0 buffer usage"}, +/* 20 */{"queue 1 buffer usage"}, + {"queue 2 buffer usage"}, + {"queue 3 buffer usage"}, + {"rx poll time"}, + {"rx poll count"}, + {"rx do_QDIO time"}, + {"rx do_QDIO count"}, + {"tx handler time"}, + {"tx handler count"}, + {"tx time"}, +/* 30 */{"tx count"}, + {"tx do_QDIO time"}, + {"tx do_QDIO count"}, + {"tx csum"}, + {"tx lin"}, + {"tx linfail"}, + {"cq handler count"}, + {"cq handler time"}, + {"rx csum"} +}; + +int qeth_core_get_sset_count(struct net_device *dev, int stringset) +{ + switch (stringset) { + case ETH_SS_STATS: + return (sizeof(qeth_ethtool_stats_keys) / ETH_GSTRING_LEN); + default: + return -EINVAL; + } +} +EXPORT_SYMBOL_GPL(qeth_core_get_sset_count); + +void qeth_core_get_ethtool_stats(struct net_device *dev, + struct ethtool_stats *stats, u64 *data) +{ + struct qeth_card *card = dev->ml_priv; + data[0] = card->stats.rx_packets - + card->perf_stats.initial_rx_packets; + data[1] = card->perf_stats.bufs_rec; + data[2] = card->stats.tx_packets - + card->perf_stats.initial_tx_packets; + data[3] = card->perf_stats.bufs_sent; + data[4] = card->stats.tx_packets - card->perf_stats.initial_tx_packets + - card->perf_stats.skbs_sent_pack; + data[5] = card->perf_stats.bufs_sent - card->perf_stats.bufs_sent_pack; + data[6] = card->perf_stats.skbs_sent_pack; + data[7] = card->perf_stats.bufs_sent_pack; + data[8] = card->perf_stats.sg_skbs_sent; + data[9] = card->perf_stats.buf_elements_sent; + data[10] = card->perf_stats.sg_skbs_rx; + data[11] = card->perf_stats.sg_frags_rx; + data[12] = card->perf_stats.sg_alloc_page_rx; + data[13] = (card->perf_stats.large_send_bytes >> 10); + data[14] = card->perf_stats.large_send_cnt; + data[15] = card->perf_stats.sc_dp_p; + data[16] = card->perf_stats.sc_p_dp; + data[17] = QETH_LOW_WATERMARK_PACK; + data[18] = QETH_HIGH_WATERMARK_PACK; + data[19] = atomic_read(&card->qdio.out_qs[0]->used_buffers); + data[20] = (card->qdio.no_out_queues > 1) ? + atomic_read(&card->qdio.out_qs[1]->used_buffers) : 0; + data[21] = (card->qdio.no_out_queues > 2) ? + atomic_read(&card->qdio.out_qs[2]->used_buffers) : 0; + data[22] = (card->qdio.no_out_queues > 3) ? + atomic_read(&card->qdio.out_qs[3]->used_buffers) : 0; + data[23] = card->perf_stats.inbound_time; + data[24] = card->perf_stats.inbound_cnt; + data[25] = card->perf_stats.inbound_do_qdio_time; + data[26] = card->perf_stats.inbound_do_qdio_cnt; + data[27] = card->perf_stats.outbound_handler_time; + data[28] = card->perf_stats.outbound_handler_cnt; + data[29] = card->perf_stats.outbound_time; + data[30] = card->perf_stats.outbound_cnt; + data[31] = card->perf_stats.outbound_do_qdio_time; + data[32] = card->perf_stats.outbound_do_qdio_cnt; + data[33] = card->perf_stats.tx_csum; + data[34] = card->perf_stats.tx_lin; + data[35] = card->perf_stats.tx_linfail; + data[36] = card->perf_stats.cq_cnt; + data[37] = card->perf_stats.cq_time; + data[38] = card->perf_stats.rx_csum; +} +EXPORT_SYMBOL_GPL(qeth_core_get_ethtool_stats); + +void qeth_core_get_strings(struct net_device *dev, u32 stringset, u8 *data) +{ + switch (stringset) { + case ETH_SS_STATS: + memcpy(data, &qeth_ethtool_stats_keys, + sizeof(qeth_ethtool_stats_keys)); + break; + default: + WARN_ON(1); + break; + } +} +EXPORT_SYMBOL_GPL(qeth_core_get_strings); + +void qeth_core_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info) +{ + struct qeth_card *card = dev->ml_priv; + + strlcpy(info->driver, card->options.layer2 ? "qeth_l2" : "qeth_l3", + sizeof(info->driver)); + strlcpy(info->version, "1.0", sizeof(info->version)); + strlcpy(info->fw_version, card->info.mcl_level, + sizeof(info->fw_version)); + snprintf(info->bus_info, sizeof(info->bus_info), "%s/%s/%s", + CARD_RDEV_ID(card), CARD_WDEV_ID(card), CARD_DDEV_ID(card)); +} +EXPORT_SYMBOL_GPL(qeth_core_get_drvinfo); + +/* Helper function to fill 'advertising' and 'supported' which are the same. */ +/* Autoneg and full-duplex are supported and advertised unconditionally. */ +/* Always advertise and support all speeds up to specified, and only one */ +/* specified port type. */ +static void qeth_set_cmd_adv_sup(struct ethtool_link_ksettings *cmd, + int maxspeed, int porttype) +{ + ethtool_link_ksettings_zero_link_mode(cmd, supported); + ethtool_link_ksettings_zero_link_mode(cmd, advertising); + ethtool_link_ksettings_zero_link_mode(cmd, lp_advertising); + + ethtool_link_ksettings_add_link_mode(cmd, supported, Autoneg); + ethtool_link_ksettings_add_link_mode(cmd, advertising, Autoneg); + + switch (porttype) { + case PORT_TP: + ethtool_link_ksettings_add_link_mode(cmd, supported, TP); + ethtool_link_ksettings_add_link_mode(cmd, advertising, TP); + break; + case PORT_FIBRE: + ethtool_link_ksettings_add_link_mode(cmd, supported, FIBRE); + ethtool_link_ksettings_add_link_mode(cmd, advertising, FIBRE); + break; + default: + ethtool_link_ksettings_add_link_mode(cmd, supported, TP); + ethtool_link_ksettings_add_link_mode(cmd, advertising, TP); + WARN_ON_ONCE(1); + } + + /* fallthrough from high to low, to select all legal speeds: */ + switch (maxspeed) { + case SPEED_10000: + ethtool_link_ksettings_add_link_mode(cmd, supported, + 10000baseT_Full); + ethtool_link_ksettings_add_link_mode(cmd, advertising, + 10000baseT_Full); + case SPEED_1000: + ethtool_link_ksettings_add_link_mode(cmd, supported, + 1000baseT_Full); + ethtool_link_ksettings_add_link_mode(cmd, advertising, + 1000baseT_Full); + ethtool_link_ksettings_add_link_mode(cmd, supported, + 1000baseT_Half); + ethtool_link_ksettings_add_link_mode(cmd, advertising, + 1000baseT_Half); + case SPEED_100: + ethtool_link_ksettings_add_link_mode(cmd, supported, + 100baseT_Full); + ethtool_link_ksettings_add_link_mode(cmd, advertising, + 100baseT_Full); + ethtool_link_ksettings_add_link_mode(cmd, supported, + 100baseT_Half); + ethtool_link_ksettings_add_link_mode(cmd, advertising, + 100baseT_Half); + case SPEED_10: + ethtool_link_ksettings_add_link_mode(cmd, supported, + 10baseT_Full); + ethtool_link_ksettings_add_link_mode(cmd, advertising, + 10baseT_Full); + ethtool_link_ksettings_add_link_mode(cmd, supported, + 10baseT_Half); + ethtool_link_ksettings_add_link_mode(cmd, advertising, + 10baseT_Half); + /* end fallthrough */ + break; + default: + ethtool_link_ksettings_add_link_mode(cmd, supported, + 10baseT_Full); + ethtool_link_ksettings_add_link_mode(cmd, advertising, + 10baseT_Full); + ethtool_link_ksettings_add_link_mode(cmd, supported, + 10baseT_Half); + ethtool_link_ksettings_add_link_mode(cmd, advertising, + 10baseT_Half); + WARN_ON_ONCE(1); + } +} + +int qeth_core_ethtool_get_link_ksettings(struct net_device *netdev, + struct ethtool_link_ksettings *cmd) +{ + struct qeth_card *card = netdev->ml_priv; + enum qeth_link_types link_type; + struct carrier_info carrier_info; + int rc; + + if ((card->info.type == QETH_CARD_TYPE_IQD) || (card->info.guestlan)) + link_type = QETH_LINK_TYPE_10GBIT_ETH; + else + link_type = card->info.link_type; + + cmd->base.duplex = DUPLEX_FULL; + cmd->base.autoneg = AUTONEG_ENABLE; + cmd->base.phy_address = 0; + cmd->base.mdio_support = 0; + cmd->base.eth_tp_mdix = ETH_TP_MDI_INVALID; + cmd->base.eth_tp_mdix_ctrl = ETH_TP_MDI_INVALID; + + switch (link_type) { + case QETH_LINK_TYPE_FAST_ETH: + case QETH_LINK_TYPE_LANE_ETH100: + cmd->base.speed = SPEED_100; + cmd->base.port = PORT_TP; + break; + case QETH_LINK_TYPE_GBIT_ETH: + case QETH_LINK_TYPE_LANE_ETH1000: + cmd->base.speed = SPEED_1000; + cmd->base.port = PORT_FIBRE; + break; + case QETH_LINK_TYPE_10GBIT_ETH: + cmd->base.speed = SPEED_10000; + cmd->base.port = PORT_FIBRE; + break; + default: + cmd->base.speed = SPEED_10; + cmd->base.port = PORT_TP; + } + qeth_set_cmd_adv_sup(cmd, cmd->base.speed, cmd->base.port); + + /* Check if we can obtain more accurate information. */ + /* If QUERY_CARD_INFO command is not supported or fails, */ + /* just return the heuristics that was filled above. */ + if (!qeth_card_hw_is_reachable(card)) + return -ENODEV; + rc = qeth_query_card_info(card, &carrier_info); + if (rc == -EOPNOTSUPP) /* for old hardware, return heuristic */ + return 0; + if (rc) /* report error from the hardware operation */ + return rc; + /* on success, fill in the information got from the hardware */ + + netdev_dbg(netdev, + "card info: card_type=0x%02x, port_mode=0x%04x, port_speed=0x%08x\n", + carrier_info.card_type, + carrier_info.port_mode, + carrier_info.port_speed); + + /* Update attributes for which we've obtained more authoritative */ + /* information, leave the rest the way they where filled above. */ + switch (carrier_info.card_type) { + case CARD_INFO_TYPE_1G_COPPER_A: + case CARD_INFO_TYPE_1G_COPPER_B: + cmd->base.port = PORT_TP; + qeth_set_cmd_adv_sup(cmd, SPEED_1000, cmd->base.port); + break; + case CARD_INFO_TYPE_1G_FIBRE_A: + case CARD_INFO_TYPE_1G_FIBRE_B: + cmd->base.port = PORT_FIBRE; + qeth_set_cmd_adv_sup(cmd, SPEED_1000, cmd->base.port); + break; + case CARD_INFO_TYPE_10G_FIBRE_A: + case CARD_INFO_TYPE_10G_FIBRE_B: + cmd->base.port = PORT_FIBRE; + qeth_set_cmd_adv_sup(cmd, SPEED_10000, cmd->base.port); + break; + } + + switch (carrier_info.port_mode) { + case CARD_INFO_PORTM_FULLDUPLEX: + cmd->base.duplex = DUPLEX_FULL; + break; + case CARD_INFO_PORTM_HALFDUPLEX: + cmd->base.duplex = DUPLEX_HALF; + break; + } + + switch (carrier_info.port_speed) { + case CARD_INFO_PORTS_10M: + cmd->base.speed = SPEED_10; + break; + case CARD_INFO_PORTS_100M: + cmd->base.speed = SPEED_100; + break; + case CARD_INFO_PORTS_1G: + cmd->base.speed = SPEED_1000; + break; + case CARD_INFO_PORTS_10G: + cmd->base.speed = SPEED_10000; + break; + } + + return 0; +} +EXPORT_SYMBOL_GPL(qeth_core_ethtool_get_link_ksettings); + +/* Callback to handle checksum offload command reply from OSA card. + * Verify that required features have been enabled on the card. + * Return error in hdr->return_code as this value is checked by caller. + * + * Always returns zero to indicate no further messages from the OSA card. + */ +static int qeth_ipa_checksum_run_cmd_cb(struct qeth_card *card, + struct qeth_reply *reply, + unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + struct qeth_checksum_cmd *chksum_cb = + (struct qeth_checksum_cmd *)reply->param; + + QETH_CARD_TEXT(card, 4, "chkdoccb"); + if (qeth_setassparms_inspect_rc(cmd)) + return 0; + + memset(chksum_cb, 0, sizeof(*chksum_cb)); + if (cmd->data.setassparms.hdr.command_code == IPA_CMD_ASS_START) { + chksum_cb->supported = + cmd->data.setassparms.data.chksum.supported; + QETH_CARD_TEXT_(card, 3, "strt:%x", chksum_cb->supported); + } + if (cmd->data.setassparms.hdr.command_code == IPA_CMD_ASS_ENABLE) { + chksum_cb->supported = + cmd->data.setassparms.data.chksum.supported; + chksum_cb->enabled = + cmd->data.setassparms.data.chksum.enabled; + QETH_CARD_TEXT_(card, 3, "supp:%x", chksum_cb->supported); + QETH_CARD_TEXT_(card, 3, "enab:%x", chksum_cb->enabled); + } + return 0; +} + +/* Send command to OSA card and check results. */ +static int qeth_ipa_checksum_run_cmd(struct qeth_card *card, + enum qeth_ipa_funcs ipa_func, + __u16 cmd_code, long data, + struct qeth_checksum_cmd *chksum_cb, + enum qeth_prot_versions prot) +{ + struct qeth_cmd_buffer *iob; + int rc = -ENOMEM; + + QETH_CARD_TEXT(card, 4, "chkdocmd"); + iob = qeth_get_setassparms_cmd(card, ipa_func, cmd_code, + sizeof(__u32), prot); + if (iob) + rc = qeth_send_setassparms(card, iob, sizeof(__u32), data, + qeth_ipa_checksum_run_cmd_cb, + chksum_cb); + return rc; +} + +static int qeth_send_checksum_on(struct qeth_card *card, int cstype, + enum qeth_prot_versions prot) +{ + u32 required_features = QETH_IPA_CHECKSUM_UDP | QETH_IPA_CHECKSUM_TCP; + struct qeth_checksum_cmd chksum_cb; + int rc; + + if (prot == QETH_PROT_IPV4) + required_features |= QETH_IPA_CHECKSUM_IP_HDR; + rc = qeth_ipa_checksum_run_cmd(card, cstype, IPA_CMD_ASS_START, 0, + &chksum_cb, prot); + if (!rc) { + if ((required_features & chksum_cb.supported) != + required_features) + rc = -EIO; + else if (!(QETH_IPA_CHECKSUM_LP2LP & chksum_cb.supported) && + cstype == IPA_INBOUND_CHECKSUM) + dev_warn(&card->gdev->dev, + "Hardware checksumming is performed only if %s and its peer use different OSA Express 3 ports\n", + QETH_CARD_IFNAME(card)); + } + if (rc) { + qeth_send_simple_setassparms_prot(card, cstype, + IPA_CMD_ASS_STOP, 0, prot); + dev_warn(&card->gdev->dev, + "Starting HW IPv%d checksumming for %s failed, using SW checksumming\n", + prot, QETH_CARD_IFNAME(card)); + return rc; + } + rc = qeth_ipa_checksum_run_cmd(card, cstype, IPA_CMD_ASS_ENABLE, + chksum_cb.supported, &chksum_cb, + prot); + if (!rc) { + if ((required_features & chksum_cb.enabled) != + required_features) + rc = -EIO; + } + if (rc) { + qeth_send_simple_setassparms_prot(card, cstype, + IPA_CMD_ASS_STOP, 0, prot); + dev_warn(&card->gdev->dev, + "Enabling HW IPv%d checksumming for %s failed, using SW checksumming\n", + prot, QETH_CARD_IFNAME(card)); + return rc; + } + + dev_info(&card->gdev->dev, "HW Checksumming (%sbound IPv%d) enabled\n", + cstype == IPA_INBOUND_CHECKSUM ? "in" : "out", prot); + return 0; +} + +static int qeth_set_ipa_csum(struct qeth_card *card, bool on, int cstype, + enum qeth_prot_versions prot) +{ + int rc = (on) ? qeth_send_checksum_on(card, cstype, prot) + : qeth_send_simple_setassparms_prot(card, cstype, + IPA_CMD_ASS_STOP, 0, + prot); + return rc ? -EIO : 0; +} + +static int qeth_set_ipa_tso(struct qeth_card *card, int on) +{ + int rc; + + QETH_CARD_TEXT(card, 3, "sttso"); + + if (on) { + rc = qeth_send_simple_setassparms(card, IPA_OUTBOUND_TSO, + IPA_CMD_ASS_START, 0); + if (rc) { + dev_warn(&card->gdev->dev, + "Starting outbound TCP segmentation offload for %s failed\n", + QETH_CARD_IFNAME(card)); + return -EIO; + } + dev_info(&card->gdev->dev, "Outbound TSO enabled\n"); + } else { + rc = qeth_send_simple_setassparms(card, IPA_OUTBOUND_TSO, + IPA_CMD_ASS_STOP, 0); + } + return rc; +} + +static int qeth_set_ipa_rx_csum(struct qeth_card *card, bool on) +{ + int rc_ipv4 = (on) ? -EOPNOTSUPP : 0; + int rc_ipv6; + + if (qeth_is_supported(card, IPA_INBOUND_CHECKSUM)) + rc_ipv4 = qeth_set_ipa_csum(card, on, IPA_INBOUND_CHECKSUM, + QETH_PROT_IPV4); + if (!qeth_is_supported6(card, IPA_INBOUND_CHECKSUM_V6)) + /* no/one Offload Assist available, so the rc is trivial */ + return rc_ipv4; + + rc_ipv6 = qeth_set_ipa_csum(card, on, IPA_INBOUND_CHECKSUM, + QETH_PROT_IPV6); + + if (on) + /* enable: success if any Assist is active */ + return (rc_ipv6) ? rc_ipv4 : 0; + + /* disable: failure if any Assist is still active */ + return (rc_ipv6) ? rc_ipv6 : rc_ipv4; +} + +#define QETH_HW_FEATURES (NETIF_F_RXCSUM | NETIF_F_IP_CSUM | NETIF_F_TSO | \ + NETIF_F_IPV6_CSUM) +/** + * qeth_enable_hw_features() - (Re-)Enable HW functions for device features + * @dev: a net_device + */ +void qeth_enable_hw_features(struct net_device *dev) +{ + struct qeth_card *card = dev->ml_priv; + netdev_features_t features; + + rtnl_lock(); + features = dev->features; + /* force-off any feature that needs an IPA sequence. + * netdev_update_features() will restart them. + */ + dev->features &= ~QETH_HW_FEATURES; + netdev_update_features(dev); + if (features != dev->features) + dev_warn(&card->gdev->dev, + "Device recovery failed to restore all offload features\n"); + rtnl_unlock(); +} +EXPORT_SYMBOL_GPL(qeth_enable_hw_features); + +int qeth_set_features(struct net_device *dev, netdev_features_t features) +{ + struct qeth_card *card = dev->ml_priv; + netdev_features_t changed = dev->features ^ features; + int rc = 0; + + QETH_DBF_TEXT(SETUP, 2, "setfeat"); + QETH_DBF_HEX(SETUP, 2, &features, sizeof(features)); + + if ((changed & NETIF_F_IP_CSUM)) { + rc = qeth_set_ipa_csum(card, features & NETIF_F_IP_CSUM, + IPA_OUTBOUND_CHECKSUM, QETH_PROT_IPV4); + if (rc) + changed ^= NETIF_F_IP_CSUM; + } + if (changed & NETIF_F_IPV6_CSUM) { + rc = qeth_set_ipa_csum(card, features & NETIF_F_IPV6_CSUM, + IPA_OUTBOUND_CHECKSUM, QETH_PROT_IPV6); + if (rc) + changed ^= NETIF_F_IPV6_CSUM; + } + if (changed & NETIF_F_RXCSUM) { + rc = qeth_set_ipa_rx_csum(card, features & NETIF_F_RXCSUM); + if (rc) + changed ^= NETIF_F_RXCSUM; + } + if ((changed & NETIF_F_TSO)) { + rc = qeth_set_ipa_tso(card, features & NETIF_F_TSO ? 1 : 0); + if (rc) + changed ^= NETIF_F_TSO; + } + + /* everything changed successfully? */ + if ((dev->features ^ features) == changed) + return 0; + /* something went wrong. save changed features and return error */ + dev->features ^= changed; + return -EIO; +} +EXPORT_SYMBOL_GPL(qeth_set_features); + +netdev_features_t qeth_fix_features(struct net_device *dev, + netdev_features_t features) +{ + struct qeth_card *card = dev->ml_priv; + + QETH_DBF_TEXT(SETUP, 2, "fixfeat"); + if (!qeth_is_supported(card, IPA_OUTBOUND_CHECKSUM)) + features &= ~NETIF_F_IP_CSUM; + if (!qeth_is_supported6(card, IPA_OUTBOUND_CHECKSUM_V6)) + features &= ~NETIF_F_IPV6_CSUM; + if (!qeth_is_supported(card, IPA_INBOUND_CHECKSUM) && + !qeth_is_supported6(card, IPA_INBOUND_CHECKSUM_V6)) + features &= ~NETIF_F_RXCSUM; + if (!qeth_is_supported(card, IPA_OUTBOUND_TSO)) + features &= ~NETIF_F_TSO; + /* if the card isn't up, remove features that require hw changes */ + if (card->state == CARD_STATE_DOWN || + card->state == CARD_STATE_RECOVER) + features &= ~QETH_HW_FEATURES; + QETH_DBF_HEX(SETUP, 2, &features, sizeof(features)); + return features; +} +EXPORT_SYMBOL_GPL(qeth_fix_features); + +netdev_features_t qeth_features_check(struct sk_buff *skb, + struct net_device *dev, + netdev_features_t features) +{ + /* GSO segmentation builds skbs with + * a (small) linear part for the headers, and + * page frags for the data. + * Compared to a linear skb, the header-only part consumes an + * additional buffer element. This reduces buffer utilization, and + * hurts throughput. So compress small segments into one element. + */ + if (netif_needs_gso(skb, features)) { + /* match skb_segment(): */ + unsigned int doffset = skb->data - skb_mac_header(skb); + unsigned int hsize = skb_shinfo(skb)->gso_size; + unsigned int hroom = skb_headroom(skb); + + /* linearize only if resulting skb allocations are order-0: */ + if (SKB_DATA_ALIGN(hroom + doffset + hsize) <= SKB_MAX_HEAD(0)) + features &= ~NETIF_F_SG; + } + + return vlan_features_check(skb, features); +} +EXPORT_SYMBOL_GPL(qeth_features_check); + +static int __init qeth_core_init(void) +{ + int rc; + + pr_info("loading core functions\n"); + INIT_LIST_HEAD(&qeth_core_card_list.list); + INIT_LIST_HEAD(&qeth_dbf_list); + rwlock_init(&qeth_core_card_list.rwlock); + mutex_init(&qeth_mod_mutex); + + qeth_wq = create_singlethread_workqueue("qeth_wq"); + if (!qeth_wq) { + rc = -ENOMEM; + goto out_err; + } + + rc = qeth_register_dbf_views(); + if (rc) + goto dbf_err; + qeth_core_root_dev = root_device_register("qeth"); + rc = PTR_ERR_OR_ZERO(qeth_core_root_dev); + if (rc) + goto register_err; + qeth_core_header_cache = kmem_cache_create("qeth_hdr", + sizeof(struct qeth_hdr) + ETH_HLEN, 64, 0, NULL); + if (!qeth_core_header_cache) { + rc = -ENOMEM; + goto slab_err; + } + qeth_qdio_outbuf_cache = kmem_cache_create("qeth_buf", + sizeof(struct qeth_qdio_out_buffer), 0, 0, NULL); + if (!qeth_qdio_outbuf_cache) { + rc = -ENOMEM; + goto cqslab_err; + } + rc = ccw_driver_register(&qeth_ccw_driver); + if (rc) + goto ccw_err; + rc = ccwgroup_driver_register(&qeth_core_ccwgroup_driver); + if (rc) + goto ccwgroup_err; + + return 0; + +ccwgroup_err: + ccw_driver_unregister(&qeth_ccw_driver); +ccw_err: + kmem_cache_destroy(qeth_qdio_outbuf_cache); +cqslab_err: + kmem_cache_destroy(qeth_core_header_cache); +slab_err: + root_device_unregister(qeth_core_root_dev); +register_err: + qeth_unregister_dbf_views(); +dbf_err: + destroy_workqueue(qeth_wq); +out_err: + pr_err("Initializing the qeth device driver failed\n"); + return rc; +} + +static void __exit qeth_core_exit(void) +{ + qeth_clear_dbf_list(); + destroy_workqueue(qeth_wq); + ccwgroup_driver_unregister(&qeth_core_ccwgroup_driver); + ccw_driver_unregister(&qeth_ccw_driver); + kmem_cache_destroy(qeth_qdio_outbuf_cache); + kmem_cache_destroy(qeth_core_header_cache); + root_device_unregister(qeth_core_root_dev); + qeth_unregister_dbf_views(); + pr_info("core functions removed\n"); +} + +module_init(qeth_core_init); +module_exit(qeth_core_exit); +MODULE_AUTHOR("Frank Blaschka "); +MODULE_DESCRIPTION("qeth core functions"); +MODULE_LICENSE("GPL"); diff --git a/drivers/s390/net/qeth_core_mpc.c b/drivers/s390/net/qeth_core_mpc.c new file mode 100644 index 000000000..e891c0b52 --- /dev/null +++ b/drivers/s390/net/qeth_core_mpc.c @@ -0,0 +1,278 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2007 + * Author(s): Frank Pavlic , + * Thomas Spatzier , + * Frank Blaschka + */ + +#include +#include +#include "qeth_core_mpc.h" + +unsigned char IDX_ACTIVATE_READ[] = { + 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x19, 0x01, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc8, 0xc1, + 0xd3, 0xd3, 0xd6, 0xd3, 0xc5, 0x40, 0x00, 0x00, + 0x00, 0x00 +}; + +unsigned char IDX_ACTIVATE_WRITE[] = { + 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x15, 0x01, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, + 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xc8, 0xc1, + 0xd3, 0xd3, 0xd6, 0xd3, 0xc5, 0x40, 0x00, 0x00, + 0x00, 0x00 +}; + +unsigned char CM_ENABLE[] = { + 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, + 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x63, + 0x10, 0x00, 0x00, 0x01, + 0x00, 0x00, 0x00, 0x00, + 0x81, 0x7e, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, 0x00, 0x23, + 0x00, 0x00, 0x23, 0x05, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x23, 0x00, 0x00, 0x00, 0x40, + 0x00, 0x0c, 0x41, 0x02, 0x00, 0x17, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, + 0x00, 0x0b, 0x04, 0x01, + 0x7e, 0x04, 0x05, 0x00, 0x01, 0x01, 0x0f, + 0x00, + 0x0c, 0x04, 0x02, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff +}; + +unsigned char CM_SETUP[] = { + 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, + 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x64, + 0x10, 0x00, 0x00, 0x01, + 0x00, 0x00, 0x00, 0x00, + 0x81, 0x7e, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, 0x00, 0x24, + 0x00, 0x00, 0x24, 0x05, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x40, + 0x00, 0x0c, 0x41, 0x04, 0x00, 0x18, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, + 0x00, 0x09, 0x04, 0x04, + 0x05, 0x00, 0x01, 0x01, 0x11, + 0x00, 0x09, 0x04, + 0x05, 0x05, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x06, + 0x04, 0x06, 0xc8, 0x00 +}; + +unsigned char ULP_ENABLE[] = { + 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, + 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x6b, + 0x10, 0x00, 0x00, 0x01, + 0x00, 0x00, 0x00, 0x00, + 0x41, 0x7e, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, 0x00, 0x2b, + 0x00, 0x00, 0x2b, 0x05, 0x20, 0x01, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x2b, 0x00, 0x00, 0x00, 0x40, + 0x00, 0x0c, 0x41, 0x02, 0x00, 0x1f, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, + 0x00, 0x0b, 0x04, 0x01, + 0x03, 0x04, 0x05, 0x00, 0x01, 0x01, 0x12, + 0x00, + 0x14, 0x04, 0x0a, 0x00, 0x20, 0x00, 0x00, 0xff, + 0xff, 0x00, 0x08, 0xc8, 0xe8, 0xc4, 0xf1, 0xc7, + 0xf1, 0x00, 0x00 +}; + +unsigned char ULP_SETUP[] = { + 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, + 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x6c, + 0x10, 0x00, 0x00, 0x01, + 0x00, 0x00, 0x00, 0x00, + 0x41, 0x7e, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, + 0x00, 0x00, 0x00, 0x01, 0x00, 0x24, 0x00, 0x2c, + 0x00, 0x00, 0x2c, 0x05, 0x20, 0x01, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x2c, 0x00, 0x00, 0x00, 0x40, + 0x00, 0x0c, 0x41, 0x04, 0x00, 0x20, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, + 0x00, 0x09, 0x04, 0x04, + 0x05, 0x00, 0x01, 0x01, 0x14, + 0x00, 0x09, 0x04, + 0x05, 0x05, 0x30, 0x01, 0x00, 0x00, + 0x00, 0x06, + 0x04, 0x06, 0x40, 0x00, + 0x00, 0x08, 0x04, 0x0b, + 0x00, 0x00, 0x00, 0x00 +}; + +unsigned char DM_ACT[] = { + 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, + 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x55, + 0x10, 0x00, 0x00, 0x01, + 0x00, 0x00, 0x00, 0x00, + 0x41, 0x7e, 0x00, 0x01, 0x00, 0x00, 0x00, 0x03, + 0x00, 0x00, 0x00, 0x02, 0x00, 0x24, 0x00, 0x15, + 0x00, 0x00, 0x2c, 0x05, 0x20, 0x01, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x15, 0x00, 0x00, 0x00, 0x40, + 0x00, 0x0c, 0x43, 0x60, 0x00, 0x09, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, + 0x00, 0x09, 0x04, 0x04, + 0x05, 0x40, 0x01, 0x01, 0x00 +}; + +unsigned char IPA_PDU_HEADER[] = { + 0x00, 0xe0, 0x00, 0x00, 0x77, 0x77, 0x77, 0x77, + 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, + (IPA_PDU_HEADER_SIZE+sizeof(struct qeth_ipa_cmd)) / 256, + (IPA_PDU_HEADER_SIZE+sizeof(struct qeth_ipa_cmd)) % 256, + 0x10, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, + 0xc1, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, + sizeof(struct qeth_ipa_cmd) / 256, + sizeof(struct qeth_ipa_cmd) % 256, + 0x00, + sizeof(struct qeth_ipa_cmd) / 256, + sizeof(struct qeth_ipa_cmd) % 256, + 0x05, + 0x77, 0x77, 0x77, 0x77, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, + sizeof(struct qeth_ipa_cmd) / 256, + sizeof(struct qeth_ipa_cmd) % 256, + 0x00, 0x00, 0x00, 0x40, +}; +EXPORT_SYMBOL_GPL(IPA_PDU_HEADER); + +struct ipa_rc_msg { + enum qeth_ipa_return_codes rc; + const char *msg; +}; + +static const struct ipa_rc_msg qeth_ipa_rc_msg[] = { + {IPA_RC_SUCCESS, "success"}, + {IPA_RC_NOTSUPP, "Command not supported"}, + {IPA_RC_IP_TABLE_FULL, "Add Addr IP Table Full - ipv6"}, + {IPA_RC_UNKNOWN_ERROR, "IPA command failed - reason unknown"}, + {IPA_RC_UNSUPPORTED_COMMAND, "Command not supported"}, + {IPA_RC_VNICC_OOSEQ, "Command issued out of sequence"}, + {IPA_RC_INVALID_FORMAT, "invalid format or length"}, + {IPA_RC_DUP_IPV6_REMOTE, "ipv6 address already registered remote"}, + {IPA_RC_SBP_IQD_NOT_CONFIGURED, "Not configured for bridgeport"}, + {IPA_RC_DUP_IPV6_HOME, "ipv6 address already registered"}, + {IPA_RC_UNREGISTERED_ADDR, "Address not registered"}, + {IPA_RC_NO_ID_AVAILABLE, "No identifiers available"}, + {IPA_RC_ID_NOT_FOUND, "Identifier not found"}, + {IPA_RC_SBP_IQD_ANO_DEV_PRIMARY, "Primary bridgeport exists already"}, + {IPA_RC_SBP_IQD_CURRENT_SECOND, "Bridgeport is currently secondary"}, + {IPA_RC_SBP_IQD_LIMIT_SECOND, "Limit of secondary bridgeports reached"}, + {IPA_RC_INVALID_IP_VERSION, "IP version incorrect"}, + {IPA_RC_SBP_IQD_CURRENT_PRIMARY, "Bridgeport is currently primary"}, + {IPA_RC_LAN_FRAME_MISMATCH, "LAN and frame mismatch"}, + {IPA_RC_SBP_IQD_NO_QDIO_QUEUES, "QDIO queues not established"}, + {IPA_RC_L2_UNSUPPORTED_CMD, "Unsupported layer 2 command"}, + {IPA_RC_L2_DUP_MAC, "Duplicate MAC address"}, + {IPA_RC_L2_ADDR_TABLE_FULL, "Layer2 address table full"}, + {IPA_RC_L2_DUP_LAYER3_MAC, "Duplicate with layer 3 MAC"}, + {IPA_RC_L2_GMAC_NOT_FOUND, "GMAC not found"}, + {IPA_RC_L2_MAC_NOT_AUTH_BY_HYP, "L2 mac not authorized by hypervisor"}, + {IPA_RC_L2_MAC_NOT_AUTH_BY_ADP, "L2 mac not authorized by adapter"}, + {IPA_RC_L2_MAC_NOT_FOUND, "L2 mac address not found"}, + {IPA_RC_L2_INVALID_VLAN_ID, "L2 invalid vlan id"}, + {IPA_RC_L2_DUP_VLAN_ID, "L2 duplicate vlan id"}, + {IPA_RC_L2_VLAN_ID_NOT_FOUND, "L2 vlan id not found"}, + {IPA_RC_VNICC_VNICBP, "VNIC is BridgePort"}, + {IPA_RC_SBP_OSA_NOT_CONFIGURED, "Not configured for bridgeport"}, + {IPA_RC_SBP_OSA_OS_MISMATCH, "OS mismatch"}, + {IPA_RC_SBP_OSA_ANO_DEV_PRIMARY, "Primary bridgeport exists already"}, + {IPA_RC_SBP_OSA_CURRENT_SECOND, "Bridgeport is currently secondary"}, + {IPA_RC_SBP_OSA_LIMIT_SECOND, "Limit of secondary bridgeports reached"}, + {IPA_RC_SBP_OSA_NOT_AUTHD_BY_ZMAN, "Not authorized by zManager"}, + {IPA_RC_SBP_OSA_CURRENT_PRIMARY, "Bridgeport is currently primary"}, + {IPA_RC_SBP_OSA_NO_QDIO_QUEUES, "QDIO queues not established"}, + {IPA_RC_DATA_MISMATCH, "Data field mismatch (v4/v6 mixed)"}, + {IPA_RC_INVALID_MTU_SIZE, "Invalid MTU size"}, + {IPA_RC_INVALID_LANTYPE, "Invalid LAN type"}, + {IPA_RC_INVALID_LANNUM, "Invalid LAN num"}, + {IPA_RC_DUPLICATE_IP_ADDRESS, "Address already registered"}, + {IPA_RC_IP_ADDR_TABLE_FULL, "IP address table full"}, + {IPA_RC_LAN_PORT_STATE_ERROR, "LAN port state error"}, + {IPA_RC_SETIP_NO_STARTLAN, "Setip no startlan received"}, + {IPA_RC_SETIP_ALREADY_RECEIVED, "Setip already received"}, + {IPA_RC_IP_ADDR_ALREADY_USED, "IP address already in use on LAN"}, + {IPA_RC_MC_ADDR_NOT_FOUND, "Multicast address not found"}, + {IPA_RC_SETIP_INVALID_VERSION, "SETIP invalid IP version"}, + {IPA_RC_UNSUPPORTED_SUBCMD, "Unsupported assist subcommand"}, + {IPA_RC_ARP_ASSIST_NO_ENABLE, "Only partial success, no enable"}, + {IPA_RC_PRIMARY_ALREADY_DEFINED, "Primary already defined"}, + {IPA_RC_SECOND_ALREADY_DEFINED, "Secondary already defined"}, + {IPA_RC_INVALID_SETRTG_INDICATOR, "Invalid SETRTG indicator"}, + {IPA_RC_MC_ADDR_ALREADY_DEFINED, "Multicast address already defined"}, + {IPA_RC_LAN_OFFLINE, "STRTLAN_LAN_DISABLED - LAN offline"}, + {IPA_RC_VEPA_TO_VEB_TRANSITION, "Adj. switch disabled port mode RR"}, + {IPA_RC_INVALID_IP_VERSION2, "Invalid IP version"}, + {IPA_RC_ENOMEM, "Memory problem"}, + {IPA_RC_FFFF, "Unknown Error"} +}; + + + +const char *qeth_get_ipa_msg(enum qeth_ipa_return_codes rc) +{ + int x; + + for (x = 0; x < ARRAY_SIZE(qeth_ipa_rc_msg) - 1; x++) + if (qeth_ipa_rc_msg[x].rc == rc) + return qeth_ipa_rc_msg[x].msg; + return qeth_ipa_rc_msg[x].msg; +} + + +struct ipa_cmd_names { + enum qeth_ipa_cmds cmd; + const char *name; +}; + +static const struct ipa_cmd_names qeth_ipa_cmd_names[] = { + {IPA_CMD_STARTLAN, "startlan"}, + {IPA_CMD_STOPLAN, "stoplan"}, + {IPA_CMD_SETVMAC, "setvmac"}, + {IPA_CMD_DELVMAC, "delvmac"}, + {IPA_CMD_SETGMAC, "setgmac"}, + {IPA_CMD_DELGMAC, "delgmac"}, + {IPA_CMD_SETVLAN, "setvlan"}, + {IPA_CMD_DELVLAN, "delvlan"}, + {IPA_CMD_VNICC, "vnic_characteristics"}, + {IPA_CMD_SETBRIDGEPORT_OSA, "set_bridge_port(osa)"}, + {IPA_CMD_SETCCID, "setccid"}, + {IPA_CMD_DELCCID, "delccid"}, + {IPA_CMD_MODCCID, "modccid"}, + {IPA_CMD_SETIP, "setip"}, + {IPA_CMD_QIPASSIST, "qipassist"}, + {IPA_CMD_SETASSPARMS, "setassparms"}, + {IPA_CMD_SETIPM, "setipm"}, + {IPA_CMD_DELIPM, "delipm"}, + {IPA_CMD_SETRTG, "setrtg"}, + {IPA_CMD_DELIP, "delip"}, + {IPA_CMD_SETADAPTERPARMS, "setadapterparms"}, + {IPA_CMD_SET_DIAG_ASS, "set_diag_ass"}, + {IPA_CMD_SETBRIDGEPORT_IQD, "set_bridge_port(hs)"}, + {IPA_CMD_CREATE_ADDR, "create_addr"}, + {IPA_CMD_DESTROY_ADDR, "destroy_addr"}, + {IPA_CMD_REGISTER_LOCAL_ADDR, "register_local_addr"}, + {IPA_CMD_UNREGISTER_LOCAL_ADDR, "unregister_local_addr"}, + {IPA_CMD_ADDRESS_CHANGE_NOTIF, "address_change_notification"}, + {IPA_CMD_UNKNOWN, "unknown"}, +}; + +const char *qeth_get_ipa_cmd_name(enum qeth_ipa_cmds cmd) +{ + int x; + + for (x = 0; x < ARRAY_SIZE(qeth_ipa_cmd_names) - 1; x++) + if (qeth_ipa_cmd_names[x].cmd == cmd) + return qeth_ipa_cmd_names[x].name; + return qeth_ipa_cmd_names[x].name; +} diff --git a/drivers/s390/net/qeth_core_mpc.h b/drivers/s390/net/qeth_core_mpc.h new file mode 100644 index 000000000..aa5de1fe0 --- /dev/null +++ b/drivers/s390/net/qeth_core_mpc.h @@ -0,0 +1,910 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2007 + * Author(s): Frank Pavlic , + * Thomas Spatzier , + * Frank Blaschka + */ + +#ifndef __QETH_CORE_MPC_H__ +#define __QETH_CORE_MPC_H__ + +#include +#include + +#define IPA_PDU_HEADER_SIZE 0x40 +#define QETH_IPA_PDU_LEN_TOTAL(buffer) (buffer + 0x0e) +#define QETH_IPA_PDU_LEN_PDU1(buffer) (buffer + 0x26) +#define QETH_IPA_PDU_LEN_PDU2(buffer) (buffer + 0x29) +#define QETH_IPA_PDU_LEN_PDU3(buffer) (buffer + 0x3a) + +extern unsigned char IPA_PDU_HEADER[]; +#define QETH_IPA_CMD_DEST_ADDR(buffer) (buffer + 0x2c) + +#define IPA_CMD_LENGTH (IPA_PDU_HEADER_SIZE + sizeof(struct qeth_ipa_cmd)) + +#define QETH_SEQ_NO_LENGTH 4 +#define QETH_MPC_TOKEN_LENGTH 4 +#define QETH_MCL_LENGTH 4 + +#define QETH_TIMEOUT (10 * HZ) +#define QETH_IPA_TIMEOUT (45 * HZ) +#define QETH_IDX_COMMAND_SEQNO 0xffff0000 + +#define QETH_CLEAR_CHANNEL_PARM -10 +#define QETH_HALT_CHANNEL_PARM -11 +#define QETH_RCD_PARM -12 + +static inline bool qeth_intparm_is_iob(unsigned long intparm) +{ + switch (intparm) { + case QETH_CLEAR_CHANNEL_PARM: + case QETH_HALT_CHANNEL_PARM: + case QETH_RCD_PARM: + case 0: + return false; + } + return true; +} + +/*****************************************************************************/ +/* IP Assist related definitions */ +/*****************************************************************************/ +#define IPA_CMD_INITIATOR_HOST 0x00 +#define IPA_CMD_INITIATOR_OSA 0x01 +#define IPA_CMD_INITIATOR_HOST_REPLY 0x80 +#define IPA_CMD_INITIATOR_OSA_REPLY 0x81 +#define IPA_CMD_PRIM_VERSION_NO 0x01 + +enum qeth_card_types { + QETH_CARD_TYPE_OSD = 1, + QETH_CARD_TYPE_IQD = 5, + QETH_CARD_TYPE_OSN = 6, + QETH_CARD_TYPE_OSM = 3, + QETH_CARD_TYPE_OSX = 2, +}; + +#define IS_IQD(card) ((card)->info.type == QETH_CARD_TYPE_IQD) +#define IS_OSN(card) ((card)->info.type == QETH_CARD_TYPE_OSN) + +#define QETH_MPC_DIFINFO_LEN_INDICATES_LINK_TYPE 0x18 +/* only the first two bytes are looked at in qeth_get_cardname_short */ +enum qeth_link_types { + QETH_LINK_TYPE_FAST_ETH = 0x01, + QETH_LINK_TYPE_HSTR = 0x02, + QETH_LINK_TYPE_GBIT_ETH = 0x03, + QETH_LINK_TYPE_OSN = 0x04, + QETH_LINK_TYPE_10GBIT_ETH = 0x10, + QETH_LINK_TYPE_LANE_ETH100 = 0x81, + QETH_LINK_TYPE_LANE_TR = 0x82, + QETH_LINK_TYPE_LANE_ETH1000 = 0x83, + QETH_LINK_TYPE_LANE = 0x88, +}; + +/* + * Routing stuff + */ +#define RESET_ROUTING_FLAG 0x10 /* indicate that routing type shall be set */ +enum qeth_routing_types { + /* TODO: set to bit flag used in IPA Command */ + NO_ROUTER = 0, + PRIMARY_ROUTER = 1, + SECONDARY_ROUTER = 2, + MULTICAST_ROUTER = 3, + PRIMARY_CONNECTOR = 4, + SECONDARY_CONNECTOR = 5, +}; + +/* IPA Commands */ +enum qeth_ipa_cmds { + IPA_CMD_STARTLAN = 0x01, + IPA_CMD_STOPLAN = 0x02, + IPA_CMD_SETVMAC = 0x21, + IPA_CMD_DELVMAC = 0x22, + IPA_CMD_SETGMAC = 0x23, + IPA_CMD_DELGMAC = 0x24, + IPA_CMD_SETVLAN = 0x25, + IPA_CMD_DELVLAN = 0x26, + IPA_CMD_VNICC = 0x2a, + IPA_CMD_SETBRIDGEPORT_OSA = 0x2b, + IPA_CMD_SETCCID = 0x41, + IPA_CMD_DELCCID = 0x42, + IPA_CMD_MODCCID = 0x43, + IPA_CMD_SETIP = 0xb1, + IPA_CMD_QIPASSIST = 0xb2, + IPA_CMD_SETASSPARMS = 0xb3, + IPA_CMD_SETIPM = 0xb4, + IPA_CMD_DELIPM = 0xb5, + IPA_CMD_SETRTG = 0xb6, + IPA_CMD_DELIP = 0xb7, + IPA_CMD_SETADAPTERPARMS = 0xb8, + IPA_CMD_SET_DIAG_ASS = 0xb9, + IPA_CMD_SETBRIDGEPORT_IQD = 0xbe, + IPA_CMD_CREATE_ADDR = 0xc3, + IPA_CMD_DESTROY_ADDR = 0xc4, + IPA_CMD_REGISTER_LOCAL_ADDR = 0xd1, + IPA_CMD_UNREGISTER_LOCAL_ADDR = 0xd2, + IPA_CMD_ADDRESS_CHANGE_NOTIF = 0xd3, + IPA_CMD_UNKNOWN = 0x00 +}; + +enum qeth_ip_ass_cmds { + IPA_CMD_ASS_START = 0x0001, + IPA_CMD_ASS_STOP = 0x0002, + IPA_CMD_ASS_CONFIGURE = 0x0003, + IPA_CMD_ASS_ENABLE = 0x0004, +}; + +enum qeth_arp_process_subcmds { + IPA_CMD_ASS_ARP_SET_NO_ENTRIES = 0x0003, + IPA_CMD_ASS_ARP_QUERY_CACHE = 0x0004, + IPA_CMD_ASS_ARP_ADD_ENTRY = 0x0005, + IPA_CMD_ASS_ARP_REMOVE_ENTRY = 0x0006, + IPA_CMD_ASS_ARP_FLUSH_CACHE = 0x0007, + IPA_CMD_ASS_ARP_QUERY_INFO = 0x0104, + IPA_CMD_ASS_ARP_QUERY_STATS = 0x0204, +}; + + +/* Return Codes for IPA Commands + * according to OSA card Specs */ + +enum qeth_ipa_return_codes { + IPA_RC_SUCCESS = 0x0000, + IPA_RC_NOTSUPP = 0x0001, + IPA_RC_IP_TABLE_FULL = 0x0002, + IPA_RC_UNKNOWN_ERROR = 0x0003, + IPA_RC_UNSUPPORTED_COMMAND = 0x0004, + IPA_RC_TRACE_ALREADY_ACTIVE = 0x0005, + IPA_RC_INVALID_FORMAT = 0x0006, + IPA_RC_DUP_IPV6_REMOTE = 0x0008, + IPA_RC_SBP_IQD_NOT_CONFIGURED = 0x000C, + IPA_RC_DUP_IPV6_HOME = 0x0010, + IPA_RC_UNREGISTERED_ADDR = 0x0011, + IPA_RC_NO_ID_AVAILABLE = 0x0012, + IPA_RC_ID_NOT_FOUND = 0x0013, + IPA_RC_SBP_IQD_ANO_DEV_PRIMARY = 0x0014, + IPA_RC_SBP_IQD_CURRENT_SECOND = 0x0018, + IPA_RC_SBP_IQD_LIMIT_SECOND = 0x001C, + IPA_RC_INVALID_IP_VERSION = 0x0020, + IPA_RC_SBP_IQD_CURRENT_PRIMARY = 0x0024, + IPA_RC_LAN_FRAME_MISMATCH = 0x0040, + IPA_RC_SBP_IQD_NO_QDIO_QUEUES = 0x00EB, + IPA_RC_L2_UNSUPPORTED_CMD = 0x2003, + IPA_RC_L2_DUP_MAC = 0x2005, + IPA_RC_L2_ADDR_TABLE_FULL = 0x2006, + IPA_RC_L2_DUP_LAYER3_MAC = 0x200a, + IPA_RC_L2_GMAC_NOT_FOUND = 0x200b, + IPA_RC_L2_MAC_NOT_AUTH_BY_HYP = 0x200c, + IPA_RC_L2_MAC_NOT_AUTH_BY_ADP = 0x200d, + IPA_RC_L2_MAC_NOT_FOUND = 0x2010, + IPA_RC_L2_INVALID_VLAN_ID = 0x2015, + IPA_RC_L2_DUP_VLAN_ID = 0x2016, + IPA_RC_L2_VLAN_ID_NOT_FOUND = 0x2017, + IPA_RC_L2_VLAN_ID_NOT_ALLOWED = 0x2050, + IPA_RC_VNICC_VNICBP = 0x20B0, + IPA_RC_SBP_OSA_NOT_CONFIGURED = 0x2B0C, + IPA_RC_SBP_OSA_OS_MISMATCH = 0x2B10, + IPA_RC_SBP_OSA_ANO_DEV_PRIMARY = 0x2B14, + IPA_RC_SBP_OSA_CURRENT_SECOND = 0x2B18, + IPA_RC_SBP_OSA_LIMIT_SECOND = 0x2B1C, + IPA_RC_SBP_OSA_NOT_AUTHD_BY_ZMAN = 0x2B20, + IPA_RC_SBP_OSA_CURRENT_PRIMARY = 0x2B24, + IPA_RC_SBP_OSA_NO_QDIO_QUEUES = 0x2BEB, + IPA_RC_DATA_MISMATCH = 0xe001, + IPA_RC_INVALID_MTU_SIZE = 0xe002, + IPA_RC_INVALID_LANTYPE = 0xe003, + IPA_RC_INVALID_LANNUM = 0xe004, + IPA_RC_DUPLICATE_IP_ADDRESS = 0xe005, + IPA_RC_IP_ADDR_TABLE_FULL = 0xe006, + IPA_RC_LAN_PORT_STATE_ERROR = 0xe007, + IPA_RC_SETIP_NO_STARTLAN = 0xe008, + IPA_RC_SETIP_ALREADY_RECEIVED = 0xe009, + IPA_RC_IP_ADDR_ALREADY_USED = 0xe00a, + IPA_RC_MC_ADDR_NOT_FOUND = 0xe00b, + IPA_RC_SETIP_INVALID_VERSION = 0xe00d, + IPA_RC_UNSUPPORTED_SUBCMD = 0xe00e, + IPA_RC_ARP_ASSIST_NO_ENABLE = 0xe00f, + IPA_RC_PRIMARY_ALREADY_DEFINED = 0xe010, + IPA_RC_SECOND_ALREADY_DEFINED = 0xe011, + IPA_RC_INVALID_SETRTG_INDICATOR = 0xe012, + IPA_RC_MC_ADDR_ALREADY_DEFINED = 0xe013, + IPA_RC_LAN_OFFLINE = 0xe080, + IPA_RC_VEPA_TO_VEB_TRANSITION = 0xe090, + IPA_RC_INVALID_IP_VERSION2 = 0xf001, + IPA_RC_ENOMEM = 0xfffe, + IPA_RC_FFFF = 0xffff +}; +/* for VNIC Characteristics */ +#define IPA_RC_VNICC_OOSEQ 0x0005 + +/* for SET_DIAGNOSTIC_ASSIST */ +#define IPA_RC_INVALID_SUBCMD IPA_RC_IP_TABLE_FULL +#define IPA_RC_HARDWARE_AUTH_ERROR IPA_RC_UNKNOWN_ERROR + +/* for SETBRIDGEPORT (double occupancies) */ +#define IPA_RC_SBP_IQD_OS_MISMATCH IPA_RC_DUP_IPV6_HOME +#define IPA_RC_SBP_IQD_NOT_AUTHD_BY_ZMAN IPA_RC_INVALID_IP_VERSION + +/* IPA function flags; each flag marks availability of respective function */ +enum qeth_ipa_funcs { + IPA_ARP_PROCESSING = 0x00000001L, + IPA_INBOUND_CHECKSUM = 0x00000002L, + IPA_OUTBOUND_CHECKSUM = 0x00000004L, + /* RESERVED = 0x00000008L,*/ + IPA_FILTERING = 0x00000010L, + IPA_IPV6 = 0x00000020L, + IPA_MULTICASTING = 0x00000040L, + IPA_IP_REASSEMBLY = 0x00000080L, + IPA_QUERY_ARP_COUNTERS = 0x00000100L, + IPA_QUERY_ARP_ADDR_INFO = 0x00000200L, + IPA_SETADAPTERPARMS = 0x00000400L, + IPA_VLAN_PRIO = 0x00000800L, + IPA_PASSTHRU = 0x00001000L, + IPA_FLUSH_ARP_SUPPORT = 0x00002000L, + IPA_FULL_VLAN = 0x00004000L, + IPA_INBOUND_PASSTHRU = 0x00008000L, + IPA_SOURCE_MAC = 0x00010000L, + IPA_OSA_MC_ROUTER = 0x00020000L, + IPA_QUERY_ARP_ASSIST = 0x00040000L, + IPA_INBOUND_TSO = 0x00080000L, + IPA_OUTBOUND_TSO = 0x00100000L, + IPA_INBOUND_CHECKSUM_V6 = 0x00400000L, + IPA_OUTBOUND_CHECKSUM_V6 = 0x00800000L, +}; + +/* SETIP/DELIP IPA Command: ***************************************************/ +enum qeth_ipa_setdelip_flags { + QETH_IPA_SETDELIP_DEFAULT = 0x00L, /* default */ + QETH_IPA_SETIP_VIPA_FLAG = 0x01L, /* no grat. ARP */ + QETH_IPA_SETIP_TAKEOVER_FLAG = 0x02L, /* nofail on grat. ARP */ + QETH_IPA_DELIP_ADDR_2_B_TAKEN_OVER = 0x20L, + QETH_IPA_DELIP_VIPA_FLAG = 0x40L, + QETH_IPA_DELIP_ADDR_NEEDS_SETIP = 0x80L, +}; + +/* SETADAPTER IPA Command: ****************************************************/ +enum qeth_ipa_setadp_cmd { + IPA_SETADP_QUERY_COMMANDS_SUPPORTED = 0x00000001L, + IPA_SETADP_ALTER_MAC_ADDRESS = 0x00000002L, + IPA_SETADP_ADD_DELETE_GROUP_ADDRESS = 0x00000004L, + IPA_SETADP_ADD_DELETE_FUNCTIONAL_ADDR = 0x00000008L, + IPA_SETADP_SET_ADDRESSING_MODE = 0x00000010L, + IPA_SETADP_SET_CONFIG_PARMS = 0x00000020L, + IPA_SETADP_SET_CONFIG_PARMS_EXTENDED = 0x00000040L, + IPA_SETADP_SET_BROADCAST_MODE = 0x00000080L, + IPA_SETADP_SEND_OSA_MESSAGE = 0x00000100L, + IPA_SETADP_SET_SNMP_CONTROL = 0x00000200L, + IPA_SETADP_QUERY_CARD_INFO = 0x00000400L, + IPA_SETADP_SET_PROMISC_MODE = 0x00000800L, + IPA_SETADP_SET_DIAG_ASSIST = 0x00002000L, + IPA_SETADP_SET_ACCESS_CONTROL = 0x00010000L, + IPA_SETADP_QUERY_OAT = 0x00080000L, + IPA_SETADP_QUERY_SWITCH_ATTRIBUTES = 0x00100000L, +}; +enum qeth_ipa_mac_ops { + CHANGE_ADDR_READ_MAC = 0, + CHANGE_ADDR_REPLACE_MAC = 1, + CHANGE_ADDR_ADD_MAC = 2, + CHANGE_ADDR_DEL_MAC = 4, + CHANGE_ADDR_RESET_MAC = 8, +}; +enum qeth_ipa_addr_ops { + CHANGE_ADDR_READ_ADDR = 0, + CHANGE_ADDR_ADD_ADDR = 1, + CHANGE_ADDR_DEL_ADDR = 2, + CHANGE_ADDR_FLUSH_ADDR_TABLE = 4, +}; +enum qeth_ipa_promisc_modes { + SET_PROMISC_MODE_OFF = 0, + SET_PROMISC_MODE_ON = 1, +}; +enum qeth_ipa_isolation_modes { + ISOLATION_MODE_NONE = 0x00000000L, + ISOLATION_MODE_FWD = 0x00000001L, + ISOLATION_MODE_DROP = 0x00000002L, +}; +enum qeth_ipa_set_access_mode_rc { + SET_ACCESS_CTRL_RC_SUCCESS = 0x0000, + SET_ACCESS_CTRL_RC_NOT_SUPPORTED = 0x0004, + SET_ACCESS_CTRL_RC_ALREADY_NOT_ISOLATED = 0x0008, + SET_ACCESS_CTRL_RC_ALREADY_ISOLATED = 0x0010, + SET_ACCESS_CTRL_RC_NONE_SHARED_ADAPTER = 0x0014, + SET_ACCESS_CTRL_RC_ACTIVE_CHECKSUM_OFF = 0x0018, + SET_ACCESS_CTRL_RC_REFLREL_UNSUPPORTED = 0x0022, + SET_ACCESS_CTRL_RC_REFLREL_FAILED = 0x0024, + SET_ACCESS_CTRL_RC_REFLREL_DEACT_FAILED = 0x0028, +}; +enum qeth_card_info_card_type { + CARD_INFO_TYPE_1G_COPPER_A = 0x61, + CARD_INFO_TYPE_1G_FIBRE_A = 0x71, + CARD_INFO_TYPE_10G_FIBRE_A = 0x91, + CARD_INFO_TYPE_1G_COPPER_B = 0xb1, + CARD_INFO_TYPE_1G_FIBRE_B = 0xa1, + CARD_INFO_TYPE_10G_FIBRE_B = 0xc1, +}; +enum qeth_card_info_port_mode { + CARD_INFO_PORTM_HALFDUPLEX = 0x0002, + CARD_INFO_PORTM_FULLDUPLEX = 0x0003, +}; +enum qeth_card_info_port_speed { + CARD_INFO_PORTS_10M = 0x00000005, + CARD_INFO_PORTS_100M = 0x00000006, + CARD_INFO_PORTS_1G = 0x00000007, + CARD_INFO_PORTS_10G = 0x00000008, +}; + +/* (SET)DELIP(M) IPA stuff ***************************************************/ +struct qeth_ipacmd_setdelip4 { + __u8 ip_addr[4]; + __u8 mask[4]; + __u32 flags; +} __attribute__ ((packed)); + +struct qeth_ipacmd_setdelip6 { + __u8 ip_addr[16]; + __u8 mask[16]; + __u32 flags; +} __attribute__ ((packed)); + +struct qeth_ipacmd_setdelipm { + __u8 mac[6]; + __u8 padding[2]; + __u8 ip6[12]; + __u8 ip4[4]; +} __attribute__ ((packed)); + +struct qeth_ipacmd_layer2setdelmac { + __u32 mac_length; + __u8 mac[6]; +} __attribute__ ((packed)); + +struct qeth_ipacmd_layer2setdelvlan { + __u16 vlan_id; +} __attribute__ ((packed)); + + +struct qeth_ipacmd_setassparms_hdr { + __u32 assist_no; + __u16 length; + __u16 command_code; + __u16 return_code; + __u8 number_of_replies; + __u8 seq_no; +} __attribute__((packed)); + +struct qeth_arp_query_data { + __u16 request_bits; + __u16 reply_bits; + __u32 no_entries; + char data; /* only for replies */ +} __attribute__((packed)); + +/* used as parameter for arp_query reply */ +struct qeth_arp_query_info { + __u32 udata_len; + __u16 mask_bits; + __u32 udata_offset; + __u32 no_entries; + char *udata; +}; + +/* IPA set assist segmentation bit definitions for receive and + * transmit checksum offloading. + */ +enum qeth_ipa_checksum_bits { + QETH_IPA_CHECKSUM_IP_HDR = 0x0002, + QETH_IPA_CHECKSUM_UDP = 0x0008, + QETH_IPA_CHECKSUM_TCP = 0x0010, + QETH_IPA_CHECKSUM_LP2LP = 0x0020 +}; + +/* IPA Assist checksum offload reply layout. */ +struct qeth_checksum_cmd { + __u32 supported; + __u32 enabled; +} __packed; + +/* SETASSPARMS IPA Command: */ +struct qeth_ipacmd_setassparms { + struct qeth_ipacmd_setassparms_hdr hdr; + union { + __u32 flags_32bit; + struct qeth_checksum_cmd chksum; + struct qeth_arp_cache_entry add_arp_entry; + struct qeth_arp_query_data query_arp; + __u8 ip[16]; + } data; +} __attribute__ ((packed)); + + +/* SETRTG IPA Command: ****************************************************/ +struct qeth_set_routing { + __u8 type; +}; + +/* SETADAPTERPARMS IPA Command: *******************************************/ +struct qeth_query_cmds_supp { + __u32 no_lantypes_supp; + __u8 lan_type; + __u8 reserved1[3]; + __u32 supported_cmds; + __u8 reserved2[8]; +} __attribute__ ((packed)); + +struct qeth_change_addr { + u32 cmd; + u32 addr_size; + u32 no_macs; + u8 addr[ETH_ALEN]; +}; + +struct qeth_snmp_cmd { + __u8 token[16]; + __u32 request; + __u32 interface; + __u32 returncode; + __u32 firmwarelevel; + __u32 seqno; + __u8 data; +} __attribute__ ((packed)); + +struct qeth_snmp_ureq_hdr { + __u32 data_len; + __u32 req_len; + __u32 reserved1; + __u32 reserved2; +} __attribute__ ((packed)); + +struct qeth_snmp_ureq { + struct qeth_snmp_ureq_hdr hdr; + struct qeth_snmp_cmd cmd; +} __attribute__((packed)); + +/* SET_ACCESS_CONTROL: same format for request and reply */ +struct qeth_set_access_ctrl { + __u32 subcmd_code; + __u8 reserved[8]; +} __attribute__((packed)); + +struct qeth_query_oat { + __u32 subcmd_code; + __u8 reserved[12]; +} __packed; + +struct qeth_qoat_priv { + __u32 buffer_len; + __u32 response_len; + char *buffer; +}; + +struct qeth_query_card_info { + __u8 card_type; + __u8 reserved1; + __u16 port_mode; + __u32 port_speed; + __u32 reserved2; +}; + +#define QETH_SWITCH_FORW_802_1 0x00000001 +#define QETH_SWITCH_FORW_REFL_RELAY 0x00000002 +#define QETH_SWITCH_CAP_RTE 0x00000004 +#define QETH_SWITCH_CAP_ECP 0x00000008 +#define QETH_SWITCH_CAP_VDP 0x00000010 + +struct qeth_query_switch_attributes { + __u8 version; + __u8 reserved1; + __u16 reserved2; + __u32 capabilities; + __u32 settings; + __u8 reserved3[8]; +}; + +struct qeth_ipacmd_setadpparms_hdr { + __u32 supp_hw_cmds; + __u32 reserved1; + __u16 cmdlength; + __u16 reserved2; + __u32 command_code; + __u16 return_code; + __u8 used_total; + __u8 seq_no; + __u32 reserved3; +} __attribute__ ((packed)); + +struct qeth_ipacmd_setadpparms { + struct qeth_ipacmd_setadpparms_hdr hdr; + union { + struct qeth_query_cmds_supp query_cmds_supp; + struct qeth_change_addr change_addr; + struct qeth_snmp_cmd snmp; + struct qeth_set_access_ctrl set_access_ctrl; + struct qeth_query_oat query_oat; + struct qeth_query_card_info card_info; + struct qeth_query_switch_attributes query_switch_attributes; + __u32 mode; + } data; +} __attribute__ ((packed)); + +/* CREATE_ADDR IPA Command: ***********************************************/ +struct qeth_create_destroy_address { + __u8 unique_id[8]; +} __attribute__ ((packed)); + +/* SET DIAGNOSTIC ASSIST IPA Command: *************************************/ + +enum qeth_diags_cmds { + QETH_DIAGS_CMD_QUERY = 0x0001, + QETH_DIAGS_CMD_TRAP = 0x0002, + QETH_DIAGS_CMD_TRACE = 0x0004, + QETH_DIAGS_CMD_NOLOG = 0x0008, + QETH_DIAGS_CMD_DUMP = 0x0010, +}; + +enum qeth_diags_trace_types { + QETH_DIAGS_TYPE_HIPERSOCKET = 0x02, +}; + +enum qeth_diags_trace_cmds { + QETH_DIAGS_CMD_TRACE_ENABLE = 0x0001, + QETH_DIAGS_CMD_TRACE_DISABLE = 0x0002, + QETH_DIAGS_CMD_TRACE_MODIFY = 0x0004, + QETH_DIAGS_CMD_TRACE_REPLACE = 0x0008, + QETH_DIAGS_CMD_TRACE_QUERY = 0x0010, +}; + +enum qeth_diags_trap_action { + QETH_DIAGS_TRAP_ARM = 0x01, + QETH_DIAGS_TRAP_DISARM = 0x02, + QETH_DIAGS_TRAP_CAPTURE = 0x04, +}; + +struct qeth_ipacmd_diagass { + __u32 host_tod2; + __u32:32; + __u16 subcmd_len; + __u16:16; + __u32 subcmd; + __u8 type; + __u8 action; + __u16 options; + __u32 ext; + __u8 cdata[64]; +} __attribute__ ((packed)); + +/* VNIC Characteristics IPA Command: *****************************************/ +/* IPA commands/sub commands for VNICC */ +#define IPA_VNICC_QUERY_CHARS 0x00000000L +#define IPA_VNICC_QUERY_CMDS 0x00000001L +#define IPA_VNICC_ENABLE 0x00000002L +#define IPA_VNICC_DISABLE 0x00000004L +#define IPA_VNICC_SET_TIMEOUT 0x00000008L +#define IPA_VNICC_GET_TIMEOUT 0x00000010L + +/* VNICC flags */ +#define QETH_VNICC_FLOODING 0x80000000 +#define QETH_VNICC_MCAST_FLOODING 0x40000000 +#define QETH_VNICC_LEARNING 0x20000000 +#define QETH_VNICC_TAKEOVER_SETVMAC 0x10000000 +#define QETH_VNICC_TAKEOVER_LEARNING 0x08000000 +#define QETH_VNICC_BRIDGE_INVISIBLE 0x04000000 +#define QETH_VNICC_RX_BCAST 0x02000000 + +/* VNICC default values */ +#define QETH_VNICC_ALL 0xff000000 +#define QETH_VNICC_DEFAULT QETH_VNICC_RX_BCAST +/* default VNICC timeout in seconds */ +#define QETH_VNICC_DEFAULT_TIMEOUT 600 + +/* VNICC header */ +struct qeth_ipacmd_vnicc_hdr { + u32 sup; + u32 cur; +}; + +/* VNICC sub command header */ +struct qeth_vnicc_sub_hdr { + u16 data_length; + u16 reserved; + u32 sub_command; +}; + +/* query supported commands for VNIC characteristic */ +struct qeth_vnicc_query_cmds { + u32 vnic_char; + u32 sup_cmds; +}; + +/* enable/disable VNIC characteristic */ +struct qeth_vnicc_set_char { + u32 vnic_char; +}; + +/* get/set timeout for VNIC characteristic */ +struct qeth_vnicc_getset_timeout { + u32 vnic_char; + u32 timeout; +}; + +/* complete VNICC IPA command message */ +struct qeth_ipacmd_vnicc { + struct qeth_ipacmd_vnicc_hdr hdr; + struct qeth_vnicc_sub_hdr sub_hdr; + union { + struct qeth_vnicc_query_cmds query_cmds; + struct qeth_vnicc_set_char set_char; + struct qeth_vnicc_getset_timeout getset_timeout; + }; +}; + +/* SETBRIDGEPORT IPA Command: *********************************************/ +enum qeth_ipa_sbp_cmd { + IPA_SBP_QUERY_COMMANDS_SUPPORTED = 0x00000000L, + IPA_SBP_RESET_BRIDGE_PORT_ROLE = 0x00000001L, + IPA_SBP_SET_PRIMARY_BRIDGE_PORT = 0x00000002L, + IPA_SBP_SET_SECONDARY_BRIDGE_PORT = 0x00000004L, + IPA_SBP_QUERY_BRIDGE_PORTS = 0x00000008L, + IPA_SBP_BRIDGE_PORT_STATE_CHANGE = 0x00000010L, +}; + +struct net_if_token { + __u16 devnum; + __u8 cssid; + __u8 iid; + __u8 ssid; + __u8 chpid; + __u16 chid; +} __packed; + +struct mac_addr_lnid { + __u8 mac[6]; + __u16 lnid; +} __packed; + +struct qeth_ipacmd_sbp_hdr { + __u32 supported_sbp_cmds; + __u32 enabled_sbp_cmds; + __u16 cmdlength; + __u16 reserved1; + __u32 command_code; + __u16 return_code; + __u8 used_total; + __u8 seq_no; + __u32 reserved2; +} __packed; + +struct qeth_sbp_query_cmds_supp { + __u32 supported_cmds; + __u32 reserved; +} __packed; + +struct qeth_sbp_reset_role { +} __packed; + +struct qeth_sbp_set_primary { + struct net_if_token token; +} __packed; + +struct qeth_sbp_set_secondary { +} __packed; + +struct qeth_sbp_port_entry { + __u8 role; + __u8 state; + __u8 reserved1; + __u8 reserved2; + struct net_if_token token; +} __packed; + +struct qeth_sbp_query_ports { + __u8 primary_bp_supported; + __u8 secondary_bp_supported; + __u8 num_entries; + __u8 entry_length; + struct qeth_sbp_port_entry entry[]; +} __packed; + +struct qeth_sbp_state_change { + __u8 primary_bp_supported; + __u8 secondary_bp_supported; + __u8 num_entries; + __u8 entry_length; + struct qeth_sbp_port_entry entry[]; +} __packed; + +struct qeth_ipacmd_setbridgeport { + struct qeth_ipacmd_sbp_hdr hdr; + union { + struct qeth_sbp_query_cmds_supp query_cmds_supp; + struct qeth_sbp_reset_role reset_role; + struct qeth_sbp_set_primary set_primary; + struct qeth_sbp_set_secondary set_secondary; + struct qeth_sbp_query_ports query_ports; + struct qeth_sbp_state_change state_change; + } data; +} __packed; + +/* ADDRESS_CHANGE_NOTIFICATION adapter-initiated "command" *******************/ +/* Bitmask for entry->change_code. Both bits may be raised. */ +enum qeth_ipa_addr_change_code { + IPA_ADDR_CHANGE_CODE_VLANID = 0x01, + IPA_ADDR_CHANGE_CODE_MACADDR = 0x02, + IPA_ADDR_CHANGE_CODE_REMOVAL = 0x80, /* else addition */ +}; + +struct qeth_ipacmd_addr_change_entry { + struct net_if_token token; + struct mac_addr_lnid addr_lnid; + __u8 change_code; + __u8 reserved1; + __u16 reserved2; +} __packed; + +struct qeth_ipacmd_addr_change { + __u8 lost_event_mask; + __u8 reserved; + __u16 num_entries; + struct qeth_ipacmd_addr_change_entry entry[]; +} __packed; + +/* Header for each IPA command */ +struct qeth_ipacmd_hdr { + __u8 command; + __u8 initiator; + __u16 seqno; + __u16 return_code; + __u8 adapter_type; + __u8 rel_adapter_no; + __u8 prim_version_no; + __u8 param_count; + __u16 prot_version; + __u32 ipa_supported; + __u32 ipa_enabled; +} __attribute__ ((packed)); + +/* The IPA command itself */ +struct qeth_ipa_cmd { + struct qeth_ipacmd_hdr hdr; + union { + struct qeth_ipacmd_setdelip4 setdelip4; + struct qeth_ipacmd_setdelip6 setdelip6; + struct qeth_ipacmd_setdelipm setdelipm; + struct qeth_ipacmd_setassparms setassparms; + struct qeth_ipacmd_layer2setdelmac setdelmac; + struct qeth_ipacmd_layer2setdelvlan setdelvlan; + struct qeth_create_destroy_address create_destroy_addr; + struct qeth_ipacmd_setadpparms setadapterparms; + struct qeth_set_routing setrtg; + struct qeth_ipacmd_diagass diagass; + struct qeth_ipacmd_setbridgeport sbp; + struct qeth_ipacmd_addr_change addrchange; + struct qeth_ipacmd_vnicc vnicc; + } data; +} __attribute__ ((packed)); + +/* + * special command for ARP processing. + * this is not included in setassparms command before, because we get + * problem with the size of struct qeth_ipacmd_setassparms otherwise + */ +enum qeth_ipa_arp_return_codes { + QETH_IPA_ARP_RC_SUCCESS = 0x0000, + QETH_IPA_ARP_RC_FAILED = 0x0001, + QETH_IPA_ARP_RC_NOTSUPP = 0x0002, + QETH_IPA_ARP_RC_OUT_OF_RANGE = 0x0003, + QETH_IPA_ARP_RC_Q_NOTSUPP = 0x0004, + QETH_IPA_ARP_RC_Q_NO_DATA = 0x0008, +}; + +extern const char *qeth_get_ipa_msg(enum qeth_ipa_return_codes rc); +extern const char *qeth_get_ipa_cmd_name(enum qeth_ipa_cmds cmd); + +#define QETH_SETASS_BASE_LEN (sizeof(struct qeth_ipacmd_hdr) + \ + sizeof(struct qeth_ipacmd_setassparms_hdr)) +#define QETH_IPA_ARP_DATA_POS(buffer) (buffer + IPA_PDU_HEADER_SIZE + \ + QETH_SETASS_BASE_LEN) +#define QETH_SETADP_BASE_LEN (sizeof(struct qeth_ipacmd_hdr) + \ + sizeof(struct qeth_ipacmd_setadpparms_hdr)) +#define QETH_SNMP_SETADP_CMDLENGTH 16 + +#define QETH_ARP_DATA_SIZE 3968 +#define QETH_ARP_CMD_LEN (QETH_ARP_DATA_SIZE + 8) +/* Helper functions */ +#define IS_IPA_REPLY(cmd) ((cmd->hdr.initiator == IPA_CMD_INITIATOR_HOST) || \ + (cmd->hdr.initiator == IPA_CMD_INITIATOR_OSA_REPLY)) + +/*****************************************************************************/ +/* END OF IP Assist related definitions */ +/*****************************************************************************/ + +extern unsigned char CM_ENABLE[]; +#define CM_ENABLE_SIZE 0x63 +#define QETH_CM_ENABLE_ISSUER_RM_TOKEN(buffer) (buffer + 0x2c) +#define QETH_CM_ENABLE_FILTER_TOKEN(buffer) (buffer + 0x53) +#define QETH_CM_ENABLE_USER_DATA(buffer) (buffer + 0x5b) + +#define QETH_CM_ENABLE_RESP_FILTER_TOKEN(buffer) \ + (PDU_ENCAPSULATION(buffer) + 0x13) + + +extern unsigned char CM_SETUP[]; +#define CM_SETUP_SIZE 0x64 +#define QETH_CM_SETUP_DEST_ADDR(buffer) (buffer + 0x2c) +#define QETH_CM_SETUP_CONNECTION_TOKEN(buffer) (buffer + 0x51) +#define QETH_CM_SETUP_FILTER_TOKEN(buffer) (buffer + 0x5a) + +#define QETH_CM_SETUP_RESP_DEST_ADDR(buffer) \ + (PDU_ENCAPSULATION(buffer) + 0x1a) + +extern unsigned char ULP_ENABLE[]; +#define ULP_ENABLE_SIZE 0x6b +#define QETH_ULP_ENABLE_LINKNUM(buffer) (buffer + 0x61) +#define QETH_ULP_ENABLE_DEST_ADDR(buffer) (buffer + 0x2c) +#define QETH_ULP_ENABLE_FILTER_TOKEN(buffer) (buffer + 0x53) +#define QETH_ULP_ENABLE_PORTNAME_AND_LL(buffer) (buffer + 0x62) +#define QETH_ULP_ENABLE_RESP_FILTER_TOKEN(buffer) \ + (PDU_ENCAPSULATION(buffer) + 0x13) +#define QETH_ULP_ENABLE_RESP_MAX_MTU(buffer) \ + (PDU_ENCAPSULATION(buffer) + 0x1f) +#define QETH_ULP_ENABLE_RESP_DIFINFO_LEN(buffer) \ + (PDU_ENCAPSULATION(buffer) + 0x17) +#define QETH_ULP_ENABLE_RESP_LINK_TYPE(buffer) \ + (PDU_ENCAPSULATION(buffer) + 0x2b) +/* Layer 2 definitions */ +#define QETH_PROT_LAYER2 0x08 +#define QETH_PROT_TCPIP 0x03 +#define QETH_PROT_OSN2 0x0a +#define QETH_ULP_ENABLE_PROT_TYPE(buffer) (buffer + 0x50) +#define QETH_IPA_CMD_PROT_TYPE(buffer) (buffer + 0x19) + +extern unsigned char ULP_SETUP[]; +#define ULP_SETUP_SIZE 0x6c +#define QETH_ULP_SETUP_DEST_ADDR(buffer) (buffer + 0x2c) +#define QETH_ULP_SETUP_CONNECTION_TOKEN(buffer) (buffer + 0x51) +#define QETH_ULP_SETUP_FILTER_TOKEN(buffer) (buffer + 0x5a) +#define QETH_ULP_SETUP_CUA(buffer) (buffer + 0x68) +#define QETH_ULP_SETUP_REAL_DEVADDR(buffer) (buffer + 0x6a) + +#define QETH_ULP_SETUP_RESP_CONNECTION_TOKEN(buffer) \ + (PDU_ENCAPSULATION(buffer) + 0x1a) + + +extern unsigned char DM_ACT[]; +#define DM_ACT_SIZE 0x55 +#define QETH_DM_ACT_DEST_ADDR(buffer) (buffer + 0x2c) +#define QETH_DM_ACT_CONNECTION_TOKEN(buffer) (buffer + 0x51) + + + +#define QETH_TRANSPORT_HEADER_SEQ_NO(buffer) (buffer + 4) +#define QETH_PDU_HEADER_SEQ_NO(buffer) (buffer + 0x1c) +#define QETH_PDU_HEADER_ACK_SEQ_NO(buffer) (buffer + 0x20) + +extern unsigned char IDX_ACTIVATE_READ[]; +extern unsigned char IDX_ACTIVATE_WRITE[]; + +#define IDX_ACTIVATE_SIZE 0x22 +#define QETH_IDX_ACT_PNO(buffer) (buffer+0x0b) +#define QETH_IDX_ACT_ISSUER_RM_TOKEN(buffer) (buffer + 0x0c) +#define QETH_IDX_NO_PORTNAME_REQUIRED(buffer) ((buffer)[0x0b] & 0x80) +#define QETH_IDX_ACT_FUNC_LEVEL(buffer) (buffer + 0x10) +#define QETH_IDX_ACT_DATASET_NAME(buffer) (buffer + 0x16) +#define QETH_IDX_ACT_QDIO_DEV_CUA(buffer) (buffer + 0x1e) +#define QETH_IDX_ACT_QDIO_DEV_REALADDR(buffer) (buffer + 0x20) +#define QETH_IS_IDX_ACT_POS_REPLY(buffer) (((buffer)[0x08] & 3) == 2) +#define QETH_IDX_REPLY_LEVEL(buffer) (buffer + 0x12) +#define QETH_IDX_ACT_CAUSE_CODE(buffer) (buffer)[0x09] +#define QETH_IDX_ACT_ERR_EXCL 0x19 +#define QETH_IDX_ACT_ERR_AUTH 0x1E +#define QETH_IDX_ACT_ERR_AUTH_USER 0x20 + +#define PDU_ENCAPSULATION(buffer) \ + (buffer + *(buffer + (*(buffer + 0x0b)) + \ + *(buffer + *(buffer + 0x0b) + 0x11) + 0x07)) + +#define IS_IPA(buffer) \ + ((buffer) && \ + (*(buffer + ((*(buffer + 0x0b)) + 4)) == 0xc1)) + +#endif diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c new file mode 100644 index 000000000..25d0be25b --- /dev/null +++ b/drivers/s390/net/qeth_core_sys.c @@ -0,0 +1,773 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2007 + * Author(s): Utz Bacher , + * Frank Pavlic , + * Thomas Spatzier , + * Frank Blaschka + */ + +#define KMSG_COMPONENT "qeth" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include + +#include "qeth_core.h" + +static ssize_t qeth_dev_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + if (!card) + return -EINVAL; + + switch (card->state) { + case CARD_STATE_DOWN: + return sprintf(buf, "DOWN\n"); + case CARD_STATE_HARDSETUP: + return sprintf(buf, "HARDSETUP\n"); + case CARD_STATE_SOFTSETUP: + return sprintf(buf, "SOFTSETUP\n"); + case CARD_STATE_UP: + if (card->lan_online) + return sprintf(buf, "UP (LAN ONLINE)\n"); + else + return sprintf(buf, "UP (LAN OFFLINE)\n"); + case CARD_STATE_RECOVER: + return sprintf(buf, "RECOVER\n"); + default: + return sprintf(buf, "UNKNOWN\n"); + } +} + +static DEVICE_ATTR(state, 0444, qeth_dev_state_show, NULL); + +static ssize_t qeth_dev_chpid_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + if (!card) + return -EINVAL; + + return sprintf(buf, "%02X\n", card->info.chpid); +} + +static DEVICE_ATTR(chpid, 0444, qeth_dev_chpid_show, NULL); + +static ssize_t qeth_dev_if_name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + if (!card) + return -EINVAL; + return sprintf(buf, "%s\n", QETH_CARD_IFNAME(card)); +} + +static DEVICE_ATTR(if_name, 0444, qeth_dev_if_name_show, NULL); + +static ssize_t qeth_dev_card_type_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + if (!card) + return -EINVAL; + + return sprintf(buf, "%s\n", qeth_get_cardname_short(card)); +} + +static DEVICE_ATTR(card_type, 0444, qeth_dev_card_type_show, NULL); + +static const char *qeth_get_bufsize_str(struct qeth_card *card) +{ + if (card->qdio.in_buf_size == 16384) + return "16k"; + else if (card->qdio.in_buf_size == 24576) + return "24k"; + else if (card->qdio.in_buf_size == 32768) + return "32k"; + else if (card->qdio.in_buf_size == 40960) + return "40k"; + else + return "64k"; +} + +static ssize_t qeth_dev_inbuf_size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + if (!card) + return -EINVAL; + + return sprintf(buf, "%s\n", qeth_get_bufsize_str(card)); +} + +static DEVICE_ATTR(inbuf_size, 0444, qeth_dev_inbuf_size_show, NULL); + +static ssize_t qeth_dev_portno_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + if (!card) + return -EINVAL; + + return sprintf(buf, "%i\n", card->dev->dev_port); +} + +static ssize_t qeth_dev_portno_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + char *tmp; + unsigned int portno, limit; + int rc = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + if ((card->state != CARD_STATE_DOWN) && + (card->state != CARD_STATE_RECOVER)) { + rc = -EPERM; + goto out; + } + + portno = simple_strtoul(buf, &tmp, 16); + if (portno > QETH_MAX_PORTNO) { + rc = -EINVAL; + goto out; + } + limit = (card->ssqd.pcnt ? card->ssqd.pcnt - 1 : card->ssqd.pcnt); + if (portno > limit) { + rc = -EINVAL; + goto out; + } + card->dev->dev_port = portno; +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static DEVICE_ATTR(portno, 0644, qeth_dev_portno_show, qeth_dev_portno_store); + +static ssize_t qeth_dev_portname_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "no portname required\n"); +} + +static ssize_t qeth_dev_portname_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + dev_warn_once(&card->gdev->dev, + "portname is deprecated and is ignored\n"); + return count; +} + +static DEVICE_ATTR(portname, 0644, qeth_dev_portname_show, + qeth_dev_portname_store); + +static ssize_t qeth_dev_prioqing_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + switch (card->qdio.do_prio_queueing) { + case QETH_PRIO_Q_ING_PREC: + return sprintf(buf, "%s\n", "by precedence"); + case QETH_PRIO_Q_ING_TOS: + return sprintf(buf, "%s\n", "by type of service"); + case QETH_PRIO_Q_ING_SKB: + return sprintf(buf, "%s\n", "by skb-priority"); + case QETH_PRIO_Q_ING_VLAN: + return sprintf(buf, "%s\n", "by VLAN headers"); + default: + return sprintf(buf, "always queue %i\n", + card->qdio.default_out_queue); + } +} + +static ssize_t qeth_dev_prioqing_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + int rc = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + if ((card->state != CARD_STATE_DOWN) && + (card->state != CARD_STATE_RECOVER)) { + rc = -EPERM; + goto out; + } + + /* check if 1920 devices are supported , + * if though we have to permit priority queueing + */ + if (card->qdio.no_out_queues == 1) { + card->qdio.do_prio_queueing = QETH_PRIOQ_DEFAULT; + rc = -EPERM; + goto out; + } + + if (sysfs_streq(buf, "prio_queueing_prec")) { + card->qdio.do_prio_queueing = QETH_PRIO_Q_ING_PREC; + card->qdio.default_out_queue = QETH_DEFAULT_QUEUE; + } else if (sysfs_streq(buf, "prio_queueing_skb")) { + card->qdio.do_prio_queueing = QETH_PRIO_Q_ING_SKB; + card->qdio.default_out_queue = QETH_DEFAULT_QUEUE; + } else if (sysfs_streq(buf, "prio_queueing_tos")) { + card->qdio.do_prio_queueing = QETH_PRIO_Q_ING_TOS; + card->qdio.default_out_queue = QETH_DEFAULT_QUEUE; + } else if (sysfs_streq(buf, "prio_queueing_vlan")) { + if (!card->options.layer2) { + rc = -ENOTSUPP; + goto out; + } + card->qdio.do_prio_queueing = QETH_PRIO_Q_ING_VLAN; + card->qdio.default_out_queue = QETH_DEFAULT_QUEUE; + } else if (sysfs_streq(buf, "no_prio_queueing:0")) { + card->qdio.do_prio_queueing = QETH_NO_PRIO_QUEUEING; + card->qdio.default_out_queue = 0; + } else if (sysfs_streq(buf, "no_prio_queueing:1")) { + card->qdio.do_prio_queueing = QETH_NO_PRIO_QUEUEING; + card->qdio.default_out_queue = 1; + } else if (sysfs_streq(buf, "no_prio_queueing:2")) { + card->qdio.do_prio_queueing = QETH_NO_PRIO_QUEUEING; + card->qdio.default_out_queue = 2; + } else if (sysfs_streq(buf, "no_prio_queueing:3")) { + if (card->info.type == QETH_CARD_TYPE_IQD) { + rc = -EPERM; + goto out; + } + card->qdio.do_prio_queueing = QETH_NO_PRIO_QUEUEING; + card->qdio.default_out_queue = 3; + } else if (sysfs_streq(buf, "no_prio_queueing")) { + card->qdio.do_prio_queueing = QETH_NO_PRIO_QUEUEING; + card->qdio.default_out_queue = QETH_DEFAULT_QUEUE; + } else + rc = -EINVAL; +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static DEVICE_ATTR(priority_queueing, 0644, qeth_dev_prioqing_show, + qeth_dev_prioqing_store); + +static ssize_t qeth_dev_bufcnt_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return sprintf(buf, "%i\n", card->qdio.in_buf_pool.buf_count); +} + +static ssize_t qeth_dev_bufcnt_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + char *tmp; + int cnt, old_cnt; + int rc = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + if ((card->state != CARD_STATE_DOWN) && + (card->state != CARD_STATE_RECOVER)) { + rc = -EPERM; + goto out; + } + + old_cnt = card->qdio.in_buf_pool.buf_count; + cnt = simple_strtoul(buf, &tmp, 10); + cnt = (cnt < QETH_IN_BUF_COUNT_MIN) ? QETH_IN_BUF_COUNT_MIN : + ((cnt > QETH_IN_BUF_COUNT_MAX) ? QETH_IN_BUF_COUNT_MAX : cnt); + if (old_cnt != cnt) { + rc = qeth_realloc_buffer_pool(card, cnt); + } +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static DEVICE_ATTR(buffer_count, 0644, qeth_dev_bufcnt_show, + qeth_dev_bufcnt_store); + +static ssize_t qeth_dev_recover_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + char *tmp; + int i; + + if (!card) + return -EINVAL; + + if (card->state != CARD_STATE_UP) + return -EPERM; + + i = simple_strtoul(buf, &tmp, 16); + if (i == 1) + qeth_schedule_recovery(card); + + return count; +} + +static DEVICE_ATTR(recover, 0200, NULL, qeth_dev_recover_store); + +static ssize_t qeth_dev_performance_stats_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return sprintf(buf, "%i\n", card->options.performance_stats ? 1:0); +} + +static ssize_t qeth_dev_performance_stats_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + char *tmp; + int i, rc = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + i = simple_strtoul(buf, &tmp, 16); + if ((i == 0) || (i == 1)) { + if (i == card->options.performance_stats) + goto out; + card->options.performance_stats = i; + if (i == 0) + memset(&card->perf_stats, 0, + sizeof(struct qeth_perf_stats)); + card->perf_stats.initial_rx_packets = card->stats.rx_packets; + card->perf_stats.initial_tx_packets = card->stats.tx_packets; + } else + rc = -EINVAL; +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static DEVICE_ATTR(performance_stats, 0644, qeth_dev_performance_stats_show, + qeth_dev_performance_stats_store); + +static ssize_t qeth_dev_layer2_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return sprintf(buf, "%i\n", card->options.layer2); +} + +static ssize_t qeth_dev_layer2_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + struct net_device *ndev; + char *tmp; + int i, rc = 0; + enum qeth_discipline_id newdis; + + if (!card) + return -EINVAL; + + mutex_lock(&card->discipline_mutex); + if (card->state != CARD_STATE_DOWN) { + rc = -EPERM; + goto out; + } + + i = simple_strtoul(buf, &tmp, 16); + switch (i) { + case 0: + newdis = QETH_DISCIPLINE_LAYER3; + break; + case 1: + newdis = QETH_DISCIPLINE_LAYER2; + break; + default: + rc = -EINVAL; + goto out; + } + + if (card->options.layer2 == newdis) + goto out; + if (card->info.layer_enforced) { + /* fixed layer, can't switch */ + rc = -EOPNOTSUPP; + goto out; + } + + card->info.mac_bits = 0; + if (card->discipline) { + /* start with a new, pristine netdevice: */ + ndev = qeth_clone_netdev(card->dev); + if (!ndev) { + rc = -ENOMEM; + goto out; + } + + card->discipline->remove(card->gdev); + qeth_core_free_discipline(card); + card->options.layer2 = -1; + + free_netdev(card->dev); + card->dev = ndev; + } + + rc = qeth_core_load_discipline(card, newdis); + if (rc) + goto out; + + rc = card->discipline->setup(card->gdev); + if (rc) + qeth_core_free_discipline(card); +out: + mutex_unlock(&card->discipline_mutex); + return rc ? rc : count; +} + +static DEVICE_ATTR(layer2, 0644, qeth_dev_layer2_show, + qeth_dev_layer2_store); + +#define ATTR_QETH_ISOLATION_NONE ("none") +#define ATTR_QETH_ISOLATION_FWD ("forward") +#define ATTR_QETH_ISOLATION_DROP ("drop") + +static ssize_t qeth_dev_isolation_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + switch (card->options.isolation) { + case ISOLATION_MODE_NONE: + return snprintf(buf, 6, "%s\n", ATTR_QETH_ISOLATION_NONE); + case ISOLATION_MODE_FWD: + return snprintf(buf, 9, "%s\n", ATTR_QETH_ISOLATION_FWD); + case ISOLATION_MODE_DROP: + return snprintf(buf, 6, "%s\n", ATTR_QETH_ISOLATION_DROP); + default: + return snprintf(buf, 5, "%s\n", "N/A"); + } +} + +static ssize_t qeth_dev_isolation_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + enum qeth_ipa_isolation_modes isolation; + int rc = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + if (card->info.type != QETH_CARD_TYPE_OSD && + card->info.type != QETH_CARD_TYPE_OSX) { + rc = -EOPNOTSUPP; + dev_err(&card->gdev->dev, "Adapter does not " + "support QDIO data connection isolation\n"); + goto out; + } + + /* parse input into isolation mode */ + if (sysfs_streq(buf, ATTR_QETH_ISOLATION_NONE)) { + isolation = ISOLATION_MODE_NONE; + } else if (sysfs_streq(buf, ATTR_QETH_ISOLATION_FWD)) { + isolation = ISOLATION_MODE_FWD; + } else if (sysfs_streq(buf, ATTR_QETH_ISOLATION_DROP)) { + isolation = ISOLATION_MODE_DROP; + } else { + rc = -EINVAL; + goto out; + } + rc = count; + + /* defer IP assist if device is offline (until discipline->set_online)*/ + card->options.prev_isolation = card->options.isolation; + card->options.isolation = isolation; + if (qeth_card_hw_is_reachable(card)) { + int ipa_rc = qeth_set_access_ctrl_online(card, 1); + if (ipa_rc != 0) + rc = ipa_rc; + } +out: + mutex_unlock(&card->conf_mutex); + return rc; +} + +static DEVICE_ATTR(isolation, 0644, qeth_dev_isolation_show, + qeth_dev_isolation_store); + +static ssize_t qeth_dev_switch_attrs_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + struct qeth_switch_info sw_info; + int rc = 0; + + if (!card) + return -EINVAL; + + if (!qeth_card_hw_is_reachable(card)) + return sprintf(buf, "n/a\n"); + + rc = qeth_query_switch_attributes(card, &sw_info); + if (rc) + return rc; + + if (!sw_info.capabilities) + rc = sprintf(buf, "unknown"); + + if (sw_info.capabilities & QETH_SWITCH_FORW_802_1) + rc = sprintf(buf, (sw_info.settings & QETH_SWITCH_FORW_802_1 ? + "[802.1]" : "802.1")); + if (sw_info.capabilities & QETH_SWITCH_FORW_REFL_RELAY) + rc += sprintf(buf + rc, + (sw_info.settings & QETH_SWITCH_FORW_REFL_RELAY ? + " [rr]" : " rr")); + rc += sprintf(buf + rc, "\n"); + + return rc; +} + +static DEVICE_ATTR(switch_attrs, 0444, + qeth_dev_switch_attrs_show, NULL); + +static ssize_t qeth_hw_trap_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + if (card->info.hwtrap) + return snprintf(buf, 5, "arm\n"); + else + return snprintf(buf, 8, "disarm\n"); +} + +static ssize_t qeth_hw_trap_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + int rc = 0; + int state = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + if (qeth_card_hw_is_reachable(card)) + state = 1; + + if (sysfs_streq(buf, "arm") && !card->info.hwtrap) { + if (state) { + if (qeth_is_diagass_supported(card, + QETH_DIAGS_CMD_TRAP)) { + rc = qeth_hw_trap(card, QETH_DIAGS_TRAP_ARM); + if (!rc) + card->info.hwtrap = 1; + } else + rc = -EINVAL; + } else + card->info.hwtrap = 1; + } else if (sysfs_streq(buf, "disarm") && card->info.hwtrap) { + if (state) { + rc = qeth_hw_trap(card, QETH_DIAGS_TRAP_DISARM); + if (!rc) + card->info.hwtrap = 0; + } else + card->info.hwtrap = 0; + } else if (sysfs_streq(buf, "trap") && state && card->info.hwtrap) + rc = qeth_hw_trap(card, QETH_DIAGS_TRAP_CAPTURE); + else + rc = -EINVAL; + + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static DEVICE_ATTR(hw_trap, 0644, qeth_hw_trap_show, + qeth_hw_trap_store); + +static ssize_t qeth_dev_blkt_show(char *buf, struct qeth_card *card, int value) +{ + + if (!card) + return -EINVAL; + + return sprintf(buf, "%i\n", value); +} + +static ssize_t qeth_dev_blkt_store(struct qeth_card *card, + const char *buf, size_t count, int *value, int max_value) +{ + char *tmp; + int i, rc = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + if ((card->state != CARD_STATE_DOWN) && + (card->state != CARD_STATE_RECOVER)) { + rc = -EPERM; + goto out; + } + i = simple_strtoul(buf, &tmp, 10); + if (i <= max_value) + *value = i; + else + rc = -EINVAL; +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static ssize_t qeth_dev_blkt_total_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + return qeth_dev_blkt_show(buf, card, card->info.blkt.time_total); +} + +static ssize_t qeth_dev_blkt_total_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + return qeth_dev_blkt_store(card, buf, count, + &card->info.blkt.time_total, 5000); +} + + + +static DEVICE_ATTR(total, 0644, qeth_dev_blkt_total_show, + qeth_dev_blkt_total_store); + +static ssize_t qeth_dev_blkt_inter_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + return qeth_dev_blkt_show(buf, card, card->info.blkt.inter_packet); +} + +static ssize_t qeth_dev_blkt_inter_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + return qeth_dev_blkt_store(card, buf, count, + &card->info.blkt.inter_packet, 1000); +} + +static DEVICE_ATTR(inter, 0644, qeth_dev_blkt_inter_show, + qeth_dev_blkt_inter_store); + +static ssize_t qeth_dev_blkt_inter_jumbo_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + return qeth_dev_blkt_show(buf, card, + card->info.blkt.inter_packet_jumbo); +} + +static ssize_t qeth_dev_blkt_inter_jumbo_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + return qeth_dev_blkt_store(card, buf, count, + &card->info.blkt.inter_packet_jumbo, 1000); +} + +static DEVICE_ATTR(inter_jumbo, 0644, qeth_dev_blkt_inter_jumbo_show, + qeth_dev_blkt_inter_jumbo_store); + +static struct attribute *qeth_blkt_device_attrs[] = { + &dev_attr_total.attr, + &dev_attr_inter.attr, + &dev_attr_inter_jumbo.attr, + NULL, +}; +const struct attribute_group qeth_device_blkt_group = { + .name = "blkt", + .attrs = qeth_blkt_device_attrs, +}; +EXPORT_SYMBOL_GPL(qeth_device_blkt_group); + +static struct attribute *qeth_device_attrs[] = { + &dev_attr_state.attr, + &dev_attr_chpid.attr, + &dev_attr_if_name.attr, + &dev_attr_card_type.attr, + &dev_attr_inbuf_size.attr, + &dev_attr_portno.attr, + &dev_attr_portname.attr, + &dev_attr_priority_queueing.attr, + &dev_attr_buffer_count.attr, + &dev_attr_recover.attr, + &dev_attr_performance_stats.attr, + &dev_attr_layer2.attr, + &dev_attr_isolation.attr, + &dev_attr_hw_trap.attr, + &dev_attr_switch_attrs.attr, + NULL, +}; +const struct attribute_group qeth_device_attr_group = { + .attrs = qeth_device_attrs, +}; +EXPORT_SYMBOL_GPL(qeth_device_attr_group); + +const struct attribute_group *qeth_generic_attr_groups[] = { + &qeth_device_attr_group, + &qeth_device_blkt_group, + NULL, +}; + +static struct attribute *qeth_osn_device_attrs[] = { + &dev_attr_state.attr, + &dev_attr_chpid.attr, + &dev_attr_if_name.attr, + &dev_attr_card_type.attr, + &dev_attr_buffer_count.attr, + &dev_attr_recover.attr, + NULL, +}; +static struct attribute_group qeth_osn_device_attr_group = { + .attrs = qeth_osn_device_attrs, +}; +const struct attribute_group *qeth_osn_attr_groups[] = { + &qeth_osn_device_attr_group, + NULL, +}; diff --git a/drivers/s390/net/qeth_l2.h b/drivers/s390/net/qeth_l2.h new file mode 100644 index 000000000..ddc615b43 --- /dev/null +++ b/drivers/s390/net/qeth_l2.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2013 + * Author(s): Eugene Crosser + */ + +#ifndef __QETH_L2_H__ +#define __QETH_L2_H__ + +#include "qeth_core.h" + +extern const struct attribute_group *qeth_l2_attr_groups[]; + +int qeth_l2_create_device_attributes(struct device *); +void qeth_l2_remove_device_attributes(struct device *); +void qeth_l2_setup_bridgeport_attrs(struct qeth_card *card); +int qeth_bridgeport_query_ports(struct qeth_card *card, + enum qeth_sbp_roles *role, + enum qeth_sbp_states *state); +int qeth_bridgeport_setrole(struct qeth_card *card, enum qeth_sbp_roles role); +int qeth_bridgeport_an_set(struct qeth_card *card, int enable); + +int qeth_l2_vnicc_set_state(struct qeth_card *card, u32 vnicc, bool state); +int qeth_l2_vnicc_get_state(struct qeth_card *card, u32 vnicc, bool *state); +int qeth_l2_vnicc_set_timeout(struct qeth_card *card, u32 timeout); +int qeth_l2_vnicc_get_timeout(struct qeth_card *card, u32 *timeout); +bool qeth_l2_vnicc_is_in_use(struct qeth_card *card); + +struct qeth_mac { + u8 mac_addr[ETH_ALEN]; + u8 disp_flag:2; + struct hlist_node hnode; +}; + +#endif /* __QETH_L2_H__ */ diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c new file mode 100644 index 000000000..8d30f9ac3 --- /dev/null +++ b/drivers/s390/net/qeth_l2_main.c @@ -0,0 +1,2405 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2007, 2009 + * Author(s): Utz Bacher , + * Frank Pavlic , + * Thomas Spatzier , + * Frank Blaschka + */ + +#define KMSG_COMPONENT "qeth" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "qeth_core.h" +#include "qeth_l2.h" + +static int qeth_l2_set_offline(struct ccwgroup_device *); +static int qeth_l2_stop(struct net_device *); +static void qeth_bridgeport_query_support(struct qeth_card *card); +static void qeth_bridge_state_change(struct qeth_card *card, + struct qeth_ipa_cmd *cmd); +static void qeth_bridge_host_event(struct qeth_card *card, + struct qeth_ipa_cmd *cmd); +static void qeth_l2_vnicc_set_defaults(struct qeth_card *card); +static void qeth_l2_vnicc_init(struct qeth_card *card); +static bool qeth_l2_vnicc_recover_timeout(struct qeth_card *card, u32 vnicc, + u32 *timeout); + +static struct net_device *qeth_l2_netdev_by_devno(unsigned char *read_dev_no) +{ + struct qeth_card *card; + struct net_device *ndev; + __u16 temp_dev_no; + unsigned long flags; + struct ccw_dev_id read_devid; + + ndev = NULL; + memcpy(&temp_dev_no, read_dev_no, 2); + read_lock_irqsave(&qeth_core_card_list.rwlock, flags); + list_for_each_entry(card, &qeth_core_card_list.list, list) { + ccw_device_get_id(CARD_RDEV(card), &read_devid); + if (read_devid.devno == temp_dev_no) { + ndev = card->dev; + break; + } + } + read_unlock_irqrestore(&qeth_core_card_list.rwlock, flags); + return ndev; +} + +static int qeth_setdelmac_makerc(struct qeth_card *card, int retcode) +{ + int rc; + + if (retcode) + QETH_CARD_TEXT_(card, 2, "err%04x", retcode); + switch (retcode) { + case IPA_RC_SUCCESS: + rc = 0; + break; + case IPA_RC_L2_UNSUPPORTED_CMD: + rc = -EOPNOTSUPP; + break; + case IPA_RC_L2_ADDR_TABLE_FULL: + rc = -ENOSPC; + break; + case IPA_RC_L2_DUP_MAC: + case IPA_RC_L2_DUP_LAYER3_MAC: + rc = -EEXIST; + break; + case IPA_RC_L2_MAC_NOT_AUTH_BY_HYP: + case IPA_RC_L2_MAC_NOT_AUTH_BY_ADP: + rc = -EPERM; + break; + case IPA_RC_L2_MAC_NOT_FOUND: + rc = -ENOENT; + break; + case -ENOMEM: + rc = -ENOMEM; + break; + default: + rc = -EIO; + break; + } + return rc; +} + +static int qeth_l2_send_setdelmac(struct qeth_card *card, __u8 *mac, + enum qeth_ipa_cmds ipacmd) +{ + struct qeth_ipa_cmd *cmd; + struct qeth_cmd_buffer *iob; + + QETH_CARD_TEXT(card, 2, "L2sdmac"); + iob = qeth_get_ipacmd_buffer(card, ipacmd, QETH_PROT_IPV4); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + cmd->data.setdelmac.mac_length = ETH_ALEN; + ether_addr_copy(cmd->data.setdelmac.mac, mac); + return qeth_setdelmac_makerc(card, qeth_send_ipa_cmd(card, iob, + NULL, NULL)); +} + +static int qeth_l2_send_setmac(struct qeth_card *card, __u8 *mac) +{ + int rc; + + QETH_CARD_TEXT(card, 2, "L2Setmac"); + rc = qeth_l2_send_setdelmac(card, mac, IPA_CMD_SETVMAC); + if (rc == 0) { + dev_info(&card->gdev->dev, + "MAC address %pM successfully registered on device %s\n", + mac, card->dev->name); + } else { + switch (rc) { + case -EEXIST: + dev_warn(&card->gdev->dev, + "MAC address %pM already exists\n", mac); + break; + case -EPERM: + dev_warn(&card->gdev->dev, + "MAC address %pM is not authorized\n", mac); + break; + } + } + return rc; +} + +static int qeth_l2_write_mac(struct qeth_card *card, u8 *mac) +{ + enum qeth_ipa_cmds cmd = is_multicast_ether_addr(mac) ? + IPA_CMD_SETGMAC : IPA_CMD_SETVMAC; + int rc; + + QETH_CARD_TEXT(card, 2, "L2Wmac"); + rc = qeth_l2_send_setdelmac(card, mac, cmd); + if (rc == -EEXIST) + QETH_DBF_MESSAGE(2, "MAC %pM already registered on %s\n", + mac, QETH_CARD_IFNAME(card)); + else if (rc) + QETH_DBF_MESSAGE(2, "Failed to register MAC %pM on %s: %d\n", + mac, QETH_CARD_IFNAME(card), rc); + return rc; +} + +static int qeth_l2_remove_mac(struct qeth_card *card, u8 *mac) +{ + enum qeth_ipa_cmds cmd = is_multicast_ether_addr(mac) ? + IPA_CMD_DELGMAC : IPA_CMD_DELVMAC; + int rc; + + QETH_CARD_TEXT(card, 2, "L2Rmac"); + rc = qeth_l2_send_setdelmac(card, mac, cmd); + if (rc) + QETH_DBF_MESSAGE(2, "Failed to delete MAC %pM on %s: %d\n", + mac, QETH_CARD_IFNAME(card), rc); + return rc; +} + +static void qeth_l2_del_all_macs(struct qeth_card *card) +{ + struct qeth_mac *mac; + struct hlist_node *tmp; + int i; + + spin_lock_bh(&card->mclock); + hash_for_each_safe(card->mac_htable, i, tmp, mac, hnode) { + hash_del(&mac->hnode); + kfree(mac); + } + spin_unlock_bh(&card->mclock); +} + +static int qeth_l2_get_cast_type(struct qeth_card *card, struct sk_buff *skb) +{ + if (card->info.type == QETH_CARD_TYPE_OSN) + return RTN_UNICAST; + if (is_broadcast_ether_addr(skb->data)) + return RTN_BROADCAST; + if (is_multicast_ether_addr(skb->data)) + return RTN_MULTICAST; + return RTN_UNICAST; +} + +static void qeth_l2_fill_header(struct qeth_hdr *hdr, struct sk_buff *skb, + int cast_type, unsigned int data_len) +{ + struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb_mac_header(skb); + + memset(hdr, 0, sizeof(struct qeth_hdr)); + hdr->hdr.l2.id = QETH_HEADER_TYPE_LAYER2; + hdr->hdr.l2.pkt_length = data_len; + + /* set byte byte 3 to casting flags */ + if (cast_type == RTN_MULTICAST) + hdr->hdr.l2.flags[2] |= QETH_LAYER2_FLAG_MULTICAST; + else if (cast_type == RTN_BROADCAST) + hdr->hdr.l2.flags[2] |= QETH_LAYER2_FLAG_BROADCAST; + else + hdr->hdr.l2.flags[2] |= QETH_LAYER2_FLAG_UNICAST; + + /* VSWITCH relies on the VLAN + * information to be present in + * the QDIO header */ + if (veth->h_vlan_proto == __constant_htons(ETH_P_8021Q)) { + hdr->hdr.l2.flags[2] |= QETH_LAYER2_FLAG_VLAN; + hdr->hdr.l2.vlan_id = ntohs(veth->h_vlan_TCI); + } +} + +static int qeth_setdelvlan_makerc(struct qeth_card *card, int retcode) +{ + if (retcode) + QETH_CARD_TEXT_(card, 2, "err%04x", retcode); + + switch (retcode) { + case IPA_RC_SUCCESS: + return 0; + case IPA_RC_L2_INVALID_VLAN_ID: + return -EINVAL; + case IPA_RC_L2_DUP_VLAN_ID: + return -EEXIST; + case IPA_RC_L2_VLAN_ID_NOT_FOUND: + return -ENOENT; + case IPA_RC_L2_VLAN_ID_NOT_ALLOWED: + return -EPERM; + case -ENOMEM: + return -ENOMEM; + default: + return -EIO; + } +} + +static int qeth_l2_send_setdelvlan_cb(struct qeth_card *card, + struct qeth_reply *reply, + unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + + QETH_CARD_TEXT(card, 2, "L2sdvcb"); + if (cmd->hdr.return_code) { + QETH_DBF_MESSAGE(2, "Error in processing VLAN %i on %s: 0x%x.\n", + cmd->data.setdelvlan.vlan_id, + QETH_CARD_IFNAME(card), cmd->hdr.return_code); + QETH_CARD_TEXT_(card, 2, "L2VL%4x", cmd->hdr.command); + QETH_CARD_TEXT_(card, 2, "err%d", cmd->hdr.return_code); + } + return 0; +} + +static int qeth_l2_send_setdelvlan(struct qeth_card *card, __u16 i, + enum qeth_ipa_cmds ipacmd) +{ + struct qeth_ipa_cmd *cmd; + struct qeth_cmd_buffer *iob; + + QETH_CARD_TEXT_(card, 4, "L2sdv%x", ipacmd); + iob = qeth_get_ipacmd_buffer(card, ipacmd, QETH_PROT_IPV4); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + cmd->data.setdelvlan.vlan_id = i; + return qeth_setdelvlan_makerc(card, qeth_send_ipa_cmd(card, iob, + qeth_l2_send_setdelvlan_cb, NULL)); +} + +static void qeth_l2_process_vlans(struct qeth_card *card) +{ + struct qeth_vlan_vid *id; + + QETH_CARD_TEXT(card, 3, "L2prcvln"); + mutex_lock(&card->vid_list_mutex); + list_for_each_entry(id, &card->vid_list, list) { + qeth_l2_send_setdelvlan(card, id->vid, IPA_CMD_SETVLAN); + } + mutex_unlock(&card->vid_list_mutex); +} + +static int qeth_l2_vlan_rx_add_vid(struct net_device *dev, + __be16 proto, u16 vid) +{ + struct qeth_card *card = dev->ml_priv; + struct qeth_vlan_vid *id; + int rc; + + QETH_CARD_TEXT_(card, 4, "aid:%d", vid); + if (!vid) + return 0; + if (qeth_wait_for_threads(card, QETH_RECOVER_THREAD)) { + QETH_CARD_TEXT(card, 3, "aidREC"); + return 0; + } + id = kmalloc(sizeof(*id), GFP_KERNEL); + if (id) { + id->vid = vid; + rc = qeth_l2_send_setdelvlan(card, vid, IPA_CMD_SETVLAN); + if (rc) { + kfree(id); + return rc; + } + mutex_lock(&card->vid_list_mutex); + list_add_tail(&id->list, &card->vid_list); + mutex_unlock(&card->vid_list_mutex); + } else { + return -ENOMEM; + } + return 0; +} + +static int qeth_l2_vlan_rx_kill_vid(struct net_device *dev, + __be16 proto, u16 vid) +{ + struct qeth_vlan_vid *id, *tmpid = NULL; + struct qeth_card *card = dev->ml_priv; + int rc = 0; + + QETH_CARD_TEXT_(card, 4, "kid:%d", vid); + if (qeth_wait_for_threads(card, QETH_RECOVER_THREAD)) { + QETH_CARD_TEXT(card, 3, "kidREC"); + return 0; + } + mutex_lock(&card->vid_list_mutex); + list_for_each_entry(id, &card->vid_list, list) { + if (id->vid == vid) { + list_del(&id->list); + tmpid = id; + break; + } + } + mutex_unlock(&card->vid_list_mutex); + if (tmpid) { + rc = qeth_l2_send_setdelvlan(card, vid, IPA_CMD_DELVLAN); + kfree(tmpid); + } + return rc; +} + +static void qeth_l2_stop_card(struct qeth_card *card, int recovery_mode) +{ + QETH_DBF_TEXT(SETUP , 2, "stopcard"); + QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *)); + + qeth_set_allowed_threads(card, 0, 1); + if (card->read.state == CH_STATE_UP && + card->write.state == CH_STATE_UP && + (card->state == CARD_STATE_UP)) { + if (recovery_mode && + card->info.type != QETH_CARD_TYPE_OSN) { + qeth_l2_stop(card->dev); + } else { + rtnl_lock(); + dev_close(card->dev); + rtnl_unlock(); + } + card->info.mac_bits &= ~QETH_LAYER2_MAC_REGISTERED; + card->state = CARD_STATE_SOFTSETUP; + } + if (card->state == CARD_STATE_SOFTSETUP) { + qeth_l2_del_all_macs(card); + qeth_clear_ipacmd_list(card); + card->state = CARD_STATE_HARDSETUP; + } + if (card->state == CARD_STATE_HARDSETUP) { + qeth_qdio_clear_card(card, 0); + qeth_clear_qdio_buffers(card); + qeth_clear_working_pool_list(card); + card->state = CARD_STATE_DOWN; + } + if (card->state == CARD_STATE_DOWN) { + qeth_clear_cmd_buffers(&card->read); + qeth_clear_cmd_buffers(&card->write); + } +} + +static int qeth_l2_process_inbound_buffer(struct qeth_card *card, + int budget, int *done) +{ + int work_done = 0; + struct sk_buff *skb; + struct qeth_hdr *hdr; + unsigned int len; + + *done = 0; + WARN_ON_ONCE(!budget); + while (budget) { + skb = qeth_core_get_next_skb(card, + &card->qdio.in_q->bufs[card->rx.b_index], + &card->rx.b_element, &card->rx.e_offset, &hdr); + if (!skb) { + *done = 1; + break; + } + switch (hdr->hdr.l2.id) { + case QETH_HEADER_TYPE_LAYER2: + skb->protocol = eth_type_trans(skb, skb->dev); + qeth_rx_csum(card, skb, hdr->hdr.l2.flags[1]); + if (skb->protocol == htons(ETH_P_802_2)) + *((__u32 *)skb->cb) = ++card->seqno.pkt_seqno; + len = skb->len; + napi_gro_receive(&card->napi, skb); + break; + case QETH_HEADER_TYPE_OSN: + if (card->info.type == QETH_CARD_TYPE_OSN) { + skb_push(skb, sizeof(struct qeth_hdr)); + skb_copy_to_linear_data(skb, hdr, + sizeof(struct qeth_hdr)); + len = skb->len; + card->osn_info.data_cb(skb); + break; + } + /* else unknown */ + default: + dev_kfree_skb_any(skb); + QETH_CARD_TEXT(card, 3, "inbunkno"); + QETH_DBF_HEX(CTRL, 3, hdr, sizeof(*hdr)); + continue; + } + work_done++; + budget--; + card->stats.rx_packets++; + card->stats.rx_bytes += len; + } + return work_done; +} + +static int qeth_l2_request_initial_mac(struct qeth_card *card) +{ + int rc = 0; + + QETH_DBF_TEXT(SETUP, 2, "l2reqmac"); + QETH_DBF_TEXT_(SETUP, 2, "doL2%s", CARD_BUS_ID(card)); + + if (MACHINE_IS_VM) { + rc = qeth_vm_request_mac(card); + if (!rc) + goto out; + QETH_DBF_MESSAGE(2, "z/VM MAC Service failed on device %s: x%x\n", + CARD_BUS_ID(card), rc); + QETH_DBF_TEXT_(SETUP, 2, "err%04x", rc); + /* fall back to alternative mechanism: */ + } + + if (card->info.type == QETH_CARD_TYPE_IQD || + card->info.type == QETH_CARD_TYPE_OSM || + card->info.type == QETH_CARD_TYPE_OSX || + card->info.guestlan) { + rc = qeth_setadpparms_change_macaddr(card); + if (!rc) + goto out; + QETH_DBF_MESSAGE(2, "READ_MAC Assist failed on device %s: x%x\n", + CARD_BUS_ID(card), rc); + QETH_DBF_TEXT_(SETUP, 2, "1err%04x", rc); + /* fall back once more: */ + } + + /* some devices don't support a custom MAC address: */ + if (card->info.type == QETH_CARD_TYPE_OSM || + card->info.type == QETH_CARD_TYPE_OSX) + return (rc) ? rc : -EADDRNOTAVAIL; + eth_hw_addr_random(card->dev); + +out: + QETH_DBF_HEX(SETUP, 2, card->dev->dev_addr, card->dev->addr_len); + return 0; +} + +static int qeth_l2_set_mac_address(struct net_device *dev, void *p) +{ + struct sockaddr *addr = p; + struct qeth_card *card = dev->ml_priv; + u8 old_addr[ETH_ALEN]; + int rc = 0; + + QETH_CARD_TEXT(card, 3, "setmac"); + + if (card->info.type == QETH_CARD_TYPE_OSN || + card->info.type == QETH_CARD_TYPE_OSM || + card->info.type == QETH_CARD_TYPE_OSX) { + QETH_CARD_TEXT(card, 3, "setmcTYP"); + return -EOPNOTSUPP; + } + QETH_CARD_HEX(card, 3, addr->sa_data, ETH_ALEN); + if (!is_valid_ether_addr(addr->sa_data)) + return -EADDRNOTAVAIL; + + if (qeth_wait_for_threads(card, QETH_RECOVER_THREAD)) { + QETH_CARD_TEXT(card, 3, "setmcREC"); + return -ERESTARTSYS; + } + + /* avoid racing against concurrent state change: */ + if (!mutex_trylock(&card->conf_mutex)) + return -EAGAIN; + + if (!qeth_card_hw_is_reachable(card)) { + ether_addr_copy(dev->dev_addr, addr->sa_data); + goto out_unlock; + } + + /* don't register the same address twice */ + if (ether_addr_equal_64bits(dev->dev_addr, addr->sa_data) && + (card->info.mac_bits & QETH_LAYER2_MAC_REGISTERED)) + goto out_unlock; + + /* add the new address, switch over, drop the old */ + rc = qeth_l2_send_setmac(card, addr->sa_data); + if (rc) + goto out_unlock; + ether_addr_copy(old_addr, dev->dev_addr); + ether_addr_copy(dev->dev_addr, addr->sa_data); + + if (card->info.mac_bits & QETH_LAYER2_MAC_REGISTERED) + qeth_l2_remove_mac(card, old_addr); + card->info.mac_bits |= QETH_LAYER2_MAC_REGISTERED; + +out_unlock: + mutex_unlock(&card->conf_mutex); + return rc; +} + +static void qeth_promisc_to_bridge(struct qeth_card *card) +{ + struct net_device *dev = card->dev; + enum qeth_ipa_promisc_modes promisc_mode; + int role; + int rc; + + QETH_CARD_TEXT(card, 3, "pmisc2br"); + + if (!card->options.sbp.reflect_promisc) + return; + promisc_mode = (dev->flags & IFF_PROMISC) ? SET_PROMISC_MODE_ON + : SET_PROMISC_MODE_OFF; + if (promisc_mode == card->info.promisc_mode) + return; + + if (promisc_mode == SET_PROMISC_MODE_ON) { + if (card->options.sbp.reflect_promisc_primary) + role = QETH_SBP_ROLE_PRIMARY; + else + role = QETH_SBP_ROLE_SECONDARY; + } else + role = QETH_SBP_ROLE_NONE; + + rc = qeth_bridgeport_setrole(card, role); + QETH_DBF_TEXT_(SETUP, 2, "bpm%c%04x", + (promisc_mode == SET_PROMISC_MODE_ON) ? '+' : '-', rc); + if (!rc) { + card->options.sbp.role = role; + card->info.promisc_mode = promisc_mode; + } + +} +/* New MAC address is added to the hash table and marked to be written on card + * only if there is not in the hash table storage already + * +*/ +static void qeth_l2_add_mac(struct qeth_card *card, struct netdev_hw_addr *ha) +{ + u32 mac_hash = get_unaligned((u32 *)(&ha->addr[2])); + struct qeth_mac *mac; + + hash_for_each_possible(card->mac_htable, mac, hnode, mac_hash) { + if (ether_addr_equal_64bits(ha->addr, mac->mac_addr)) { + mac->disp_flag = QETH_DISP_ADDR_DO_NOTHING; + return; + } + } + + mac = kzalloc(sizeof(struct qeth_mac), GFP_ATOMIC); + if (!mac) + return; + + ether_addr_copy(mac->mac_addr, ha->addr); + mac->disp_flag = QETH_DISP_ADDR_ADD; + + hash_add(card->mac_htable, &mac->hnode, mac_hash); +} + +static void qeth_l2_set_rx_mode(struct net_device *dev) +{ + struct qeth_card *card = dev->ml_priv; + struct netdev_hw_addr *ha; + struct qeth_mac *mac; + struct hlist_node *tmp; + int i; + int rc; + + if (card->info.type == QETH_CARD_TYPE_OSN) + return; + + QETH_CARD_TEXT(card, 3, "setmulti"); + if (qeth_threads_running(card, QETH_RECOVER_THREAD) && + (card->state != CARD_STATE_UP)) + return; + + spin_lock_bh(&card->mclock); + + netdev_for_each_mc_addr(ha, dev) + qeth_l2_add_mac(card, ha); + netdev_for_each_uc_addr(ha, dev) + qeth_l2_add_mac(card, ha); + + hash_for_each_safe(card->mac_htable, i, tmp, mac, hnode) { + switch (mac->disp_flag) { + case QETH_DISP_ADDR_DELETE: + qeth_l2_remove_mac(card, mac->mac_addr); + hash_del(&mac->hnode); + kfree(mac); + break; + case QETH_DISP_ADDR_ADD: + rc = qeth_l2_write_mac(card, mac->mac_addr); + if (rc) { + hash_del(&mac->hnode); + kfree(mac); + break; + } + /* fall through */ + default: + /* for next call to set_rx_mode(): */ + mac->disp_flag = QETH_DISP_ADDR_DELETE; + } + } + + spin_unlock_bh(&card->mclock); + + if (qeth_adp_supported(card, IPA_SETADP_SET_PROMISC_MODE)) + qeth_setadp_promisc_mode(card); + else + qeth_promisc_to_bridge(card); +} + +static int qeth_l2_xmit(struct qeth_card *card, struct sk_buff *skb, + struct qeth_qdio_out_q *queue, int cast_type, int ipv) +{ + const unsigned int proto_len = IS_IQD(card) ? ETH_HLEN : 0; + const unsigned int hw_hdr_len = sizeof(struct qeth_hdr); + unsigned int frame_len = skb->len; + unsigned int data_offset = 0; + struct qeth_hdr *hdr = NULL; + unsigned int hd_len = 0; + unsigned int elements; + int push_len, rc; + bool is_sg; + + rc = skb_cow_head(skb, hw_hdr_len); + if (rc) + return rc; + + push_len = qeth_add_hw_header(card, skb, &hdr, hw_hdr_len, proto_len, + &elements); + if (push_len < 0) + return push_len; + if (!push_len) { + /* HW header needs its own buffer element. */ + hd_len = hw_hdr_len + proto_len; + data_offset = proto_len; + } + qeth_l2_fill_header(hdr, skb, cast_type, frame_len); + if (skb->ip_summed == CHECKSUM_PARTIAL) { + qeth_tx_csum(skb, &hdr->hdr.l2.flags[1], ipv); + if (card->options.performance_stats) + card->perf_stats.tx_csum++; + } + + is_sg = skb_is_nonlinear(skb); + if (IS_IQD(card)) { + rc = qeth_do_send_packet_fast(queue, skb, hdr, data_offset, + hd_len); + } else { + /* TODO: drop skb_orphan() once TX completion is fast enough */ + skb_orphan(skb); + rc = qeth_do_send_packet(card, queue, skb, hdr, data_offset, + hd_len, elements); + } + + if (!rc) { + if (card->options.performance_stats) { + card->perf_stats.buf_elements_sent += elements; + if (is_sg) + card->perf_stats.sg_skbs_sent++; + } + } else { + if (!push_len) + kmem_cache_free(qeth_core_header_cache, hdr); + if (rc == -EBUSY) + /* roll back to ETH header */ + skb_pull(skb, push_len); + } + return rc; +} + +static int qeth_l2_xmit_osn(struct qeth_card *card, struct sk_buff *skb, + struct qeth_qdio_out_q *queue) +{ + unsigned int elements; + struct qeth_hdr *hdr; + + if (skb->protocol == htons(ETH_P_IPV6)) + return -EPROTONOSUPPORT; + + hdr = (struct qeth_hdr *)skb->data; + elements = qeth_get_elements_no(card, skb, 0, 0); + if (!elements) + return -E2BIG; + if (qeth_hdr_chk_and_bounce(skb, &hdr, sizeof(*hdr))) + return -EINVAL; + return qeth_do_send_packet(card, queue, skb, hdr, 0, 0, elements); +} + +static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct qeth_card *card = dev->ml_priv; + int cast_type = qeth_l2_get_cast_type(card, skb); + int ipv = qeth_get_ip_version(skb); + struct qeth_qdio_out_q *queue; + int tx_bytes = skb->len; + int rc; + + if ((card->state != CARD_STATE_UP) || !card->lan_online) { + card->stats.tx_carrier_errors++; + goto tx_drop; + } + + queue = qeth_get_tx_queue(card, skb, ipv, cast_type); + + if (card->options.performance_stats) { + card->perf_stats.outbound_cnt++; + card->perf_stats.outbound_start_time = qeth_get_micros(); + } + netif_stop_queue(dev); + + if (IS_OSN(card)) + rc = qeth_l2_xmit_osn(card, skb, queue); + else + rc = qeth_l2_xmit(card, skb, queue, cast_type, ipv); + + if (!rc) { + card->stats.tx_packets++; + card->stats.tx_bytes += tx_bytes; + if (card->options.performance_stats) + card->perf_stats.outbound_time += qeth_get_micros() - + card->perf_stats.outbound_start_time; + netif_wake_queue(dev); + return NETDEV_TX_OK; + } else if (rc == -EBUSY) { + return NETDEV_TX_BUSY; + } /* else fall through */ + +tx_drop: + card->stats.tx_dropped++; + card->stats.tx_errors++; + dev_kfree_skb_any(skb); + netif_wake_queue(dev); + return NETDEV_TX_OK; +} + +static int __qeth_l2_open(struct net_device *dev) +{ + struct qeth_card *card = dev->ml_priv; + int rc = 0; + + QETH_CARD_TEXT(card, 4, "qethopen"); + if (card->state == CARD_STATE_UP) + return rc; + if (card->state != CARD_STATE_SOFTSETUP) + return -ENODEV; + + if ((card->info.type != QETH_CARD_TYPE_OSN) && + (!(card->info.mac_bits & QETH_LAYER2_MAC_REGISTERED))) { + QETH_CARD_TEXT(card, 4, "nomacadr"); + return -EPERM; + } + card->data.state = CH_STATE_UP; + card->state = CARD_STATE_UP; + netif_start_queue(dev); + + if (qdio_stop_irq(card->data.ccwdev, 0) >= 0) { + napi_enable(&card->napi); + local_bh_disable(); + napi_schedule(&card->napi); + /* kick-start the NAPI softirq: */ + local_bh_enable(); + } else + rc = -EIO; + return rc; +} + +static int qeth_l2_open(struct net_device *dev) +{ + struct qeth_card *card = dev->ml_priv; + + QETH_CARD_TEXT(card, 5, "qethope_"); + if (qeth_wait_for_threads(card, QETH_RECOVER_THREAD)) { + QETH_CARD_TEXT(card, 3, "openREC"); + return -ERESTARTSYS; + } + return __qeth_l2_open(dev); +} + +static int qeth_l2_stop(struct net_device *dev) +{ + struct qeth_card *card = dev->ml_priv; + + QETH_CARD_TEXT(card, 4, "qethstop"); + netif_tx_disable(dev); + if (card->state == CARD_STATE_UP) { + card->state = CARD_STATE_SOFTSETUP; + napi_disable(&card->napi); + } + return 0; +} + +static const struct device_type qeth_l2_devtype = { + .name = "qeth_layer2", + .groups = qeth_l2_attr_groups, +}; + +static int qeth_l2_probe_device(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + int rc; + + if (gdev->dev.type == &qeth_generic_devtype) { + rc = qeth_l2_create_device_attributes(&gdev->dev); + if (rc) + return rc; + } + INIT_LIST_HEAD(&card->vid_list); + hash_init(card->mac_htable); + card->options.layer2 = 1; + card->info.hwtrap = 0; + qeth_l2_vnicc_set_defaults(card); + return 0; +} + +static void qeth_l2_remove_device(struct ccwgroup_device *cgdev) +{ + struct qeth_card *card = dev_get_drvdata(&cgdev->dev); + + if (cgdev->dev.type == &qeth_generic_devtype) + qeth_l2_remove_device_attributes(&cgdev->dev); + qeth_set_allowed_threads(card, 0, 1); + wait_event(card->wait_q, qeth_threads_running(card, 0xffffffff) == 0); + + if (cgdev->state == CCWGROUP_ONLINE) + qeth_l2_set_offline(cgdev); + + cancel_work_sync(&card->close_dev_work); + if (qeth_netdev_is_registered(card->dev)) + unregister_netdev(card->dev); +} + +static const struct ethtool_ops qeth_l2_ethtool_ops = { + .get_link = ethtool_op_get_link, + .get_strings = qeth_core_get_strings, + .get_ethtool_stats = qeth_core_get_ethtool_stats, + .get_sset_count = qeth_core_get_sset_count, + .get_drvinfo = qeth_core_get_drvinfo, + .get_link_ksettings = qeth_core_ethtool_get_link_ksettings, +}; + +static const struct ethtool_ops qeth_l2_osn_ops = { + .get_strings = qeth_core_get_strings, + .get_ethtool_stats = qeth_core_get_ethtool_stats, + .get_sset_count = qeth_core_get_sset_count, + .get_drvinfo = qeth_core_get_drvinfo, +}; + +static const struct net_device_ops qeth_l2_netdev_ops = { + .ndo_open = qeth_l2_open, + .ndo_stop = qeth_l2_stop, + .ndo_get_stats = qeth_get_stats, + .ndo_start_xmit = qeth_l2_hard_start_xmit, + .ndo_features_check = qeth_features_check, + .ndo_validate_addr = eth_validate_addr, + .ndo_set_rx_mode = qeth_l2_set_rx_mode, + .ndo_do_ioctl = qeth_do_ioctl, + .ndo_set_mac_address = qeth_l2_set_mac_address, + .ndo_vlan_rx_add_vid = qeth_l2_vlan_rx_add_vid, + .ndo_vlan_rx_kill_vid = qeth_l2_vlan_rx_kill_vid, + .ndo_tx_timeout = qeth_tx_timeout, + .ndo_fix_features = qeth_fix_features, + .ndo_set_features = qeth_set_features +}; + +static int qeth_l2_setup_netdev(struct qeth_card *card) +{ + int rc; + + if (qeth_netdev_is_registered(card->dev)) + return 0; + + card->dev->priv_flags |= IFF_UNICAST_FLT; + card->dev->netdev_ops = &qeth_l2_netdev_ops; + if (card->info.type == QETH_CARD_TYPE_OSN) { + card->dev->ethtool_ops = &qeth_l2_osn_ops; + card->dev->flags |= IFF_NOARP; + } else { + card->dev->ethtool_ops = &qeth_l2_ethtool_ops; + card->dev->needed_headroom = sizeof(struct qeth_hdr); + } + + if (card->info.type == QETH_CARD_TYPE_OSM) + card->dev->features |= NETIF_F_VLAN_CHALLENGED; + else + card->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; + + if (card->info.type == QETH_CARD_TYPE_OSD && !card->info.guestlan) { + card->dev->features |= NETIF_F_SG; + /* OSA 3S and earlier has no RX/TX support */ + if (qeth_is_supported(card, IPA_OUTBOUND_CHECKSUM)) { + card->dev->hw_features |= NETIF_F_IP_CSUM; + card->dev->vlan_features |= NETIF_F_IP_CSUM; + } + } + if (qeth_is_supported6(card, IPA_OUTBOUND_CHECKSUM_V6)) { + card->dev->hw_features |= NETIF_F_IPV6_CSUM; + card->dev->vlan_features |= NETIF_F_IPV6_CSUM; + } + if (qeth_is_supported(card, IPA_INBOUND_CHECKSUM) || + qeth_is_supported6(card, IPA_INBOUND_CHECKSUM_V6)) { + card->dev->hw_features |= NETIF_F_RXCSUM; + card->dev->vlan_features |= NETIF_F_RXCSUM; + } + + qeth_l2_request_initial_mac(card); + netif_napi_add(card->dev, &card->napi, qeth_poll, QETH_NAPI_WEIGHT); + rc = register_netdev(card->dev); + if (rc) + card->dev->netdev_ops = NULL; + return rc; +} + +static int qeth_l2_start_ipassists(struct qeth_card *card) +{ + /* configure isolation level */ + if (qeth_set_access_ctrl_online(card, 0)) + return -ENODEV; + return 0; +} + +static void qeth_l2_trace_features(struct qeth_card *card) +{ + /* Set BridgePort features */ + QETH_CARD_TEXT(card, 2, "featuSBP"); + QETH_CARD_HEX(card, 2, &card->options.sbp.supported_funcs, + sizeof(card->options.sbp.supported_funcs)); + /* VNIC Characteristics features */ + QETH_CARD_TEXT(card, 2, "feaVNICC"); + QETH_CARD_HEX(card, 2, &card->options.vnicc.sup_chars, + sizeof(card->options.vnicc.sup_chars)); +} + +static int __qeth_l2_set_online(struct ccwgroup_device *gdev, int recovery_mode) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + int rc = 0; + enum qeth_card_states recover_flag; + + mutex_lock(&card->discipline_mutex); + mutex_lock(&card->conf_mutex); + QETH_DBF_TEXT(SETUP, 2, "setonlin"); + QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *)); + + recover_flag = card->state; + rc = qeth_core_hardsetup_card(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "2err%04x", rc); + rc = -ENODEV; + goto out_remove; + } + qeth_bridgeport_query_support(card); + if (card->options.sbp.supported_funcs) + dev_info(&card->gdev->dev, + "The device represents a Bridge Capable Port\n"); + + rc = qeth_l2_setup_netdev(card); + if (rc) + goto out_remove; + + if (card->info.type != QETH_CARD_TYPE_OSN && + !qeth_l2_send_setmac(card, card->dev->dev_addr)) + card->info.mac_bits |= QETH_LAYER2_MAC_REGISTERED; + + if (qeth_is_diagass_supported(card, QETH_DIAGS_CMD_TRAP)) { + if (card->info.hwtrap && + qeth_hw_trap(card, QETH_DIAGS_TRAP_ARM)) + card->info.hwtrap = 0; + } else + card->info.hwtrap = 0; + + /* for the rx_bcast characteristic, init VNICC after setmac */ + qeth_l2_vnicc_init(card); + + qeth_trace_features(card); + qeth_l2_trace_features(card); + + qeth_l2_setup_bridgeport_attrs(card); + + card->state = CARD_STATE_HARDSETUP; + qeth_print_status_message(card); + + /* softsetup */ + QETH_DBF_TEXT(SETUP, 2, "softsetp"); + + if ((card->info.type == QETH_CARD_TYPE_OSD) || + (card->info.type == QETH_CARD_TYPE_OSX)) { + rc = qeth_l2_start_ipassists(card); + if (rc) + goto out_remove; + } + + if (card->info.type != QETH_CARD_TYPE_OSN) + qeth_l2_process_vlans(card); + + netif_tx_disable(card->dev); + + rc = qeth_init_qdio_queues(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "6err%d", rc); + rc = -ENODEV; + goto out_remove; + } + card->state = CARD_STATE_SOFTSETUP; + if (card->lan_online) + netif_carrier_on(card->dev); + else + netif_carrier_off(card->dev); + + qeth_set_allowed_threads(card, 0xffffffff, 0); + + qeth_enable_hw_features(card->dev); + if (recover_flag == CARD_STATE_RECOVER) { + if (recovery_mode && + card->info.type != QETH_CARD_TYPE_OSN) { + __qeth_l2_open(card->dev); + qeth_l2_set_rx_mode(card->dev); + } else { + rtnl_lock(); + dev_open(card->dev); + rtnl_unlock(); + } + } + /* let user_space know that device is online */ + kobject_uevent(&gdev->dev.kobj, KOBJ_CHANGE); + mutex_unlock(&card->conf_mutex); + mutex_unlock(&card->discipline_mutex); + return 0; + +out_remove: + qeth_l2_stop_card(card, 0); + ccw_device_set_offline(CARD_DDEV(card)); + ccw_device_set_offline(CARD_WDEV(card)); + ccw_device_set_offline(CARD_RDEV(card)); + qdio_free(CARD_DDEV(card)); + if (recover_flag == CARD_STATE_RECOVER) + card->state = CARD_STATE_RECOVER; + else + card->state = CARD_STATE_DOWN; + mutex_unlock(&card->conf_mutex); + mutex_unlock(&card->discipline_mutex); + return rc; +} + +static int qeth_l2_set_online(struct ccwgroup_device *gdev) +{ + return __qeth_l2_set_online(gdev, 0); +} + +static int __qeth_l2_set_offline(struct ccwgroup_device *cgdev, + int recovery_mode) +{ + struct qeth_card *card = dev_get_drvdata(&cgdev->dev); + int rc = 0, rc2 = 0, rc3 = 0; + enum qeth_card_states recover_flag; + + mutex_lock(&card->discipline_mutex); + mutex_lock(&card->conf_mutex); + QETH_DBF_TEXT(SETUP, 3, "setoffl"); + QETH_DBF_HEX(SETUP, 3, &card, sizeof(void *)); + + netif_carrier_off(card->dev); + recover_flag = card->state; + if ((!recovery_mode && card->info.hwtrap) || card->info.hwtrap == 2) { + qeth_hw_trap(card, QETH_DIAGS_TRAP_DISARM); + card->info.hwtrap = 1; + } + qeth_l2_stop_card(card, recovery_mode); + rc = ccw_device_set_offline(CARD_DDEV(card)); + rc2 = ccw_device_set_offline(CARD_WDEV(card)); + rc3 = ccw_device_set_offline(CARD_RDEV(card)); + if (!rc) + rc = (rc2) ? rc2 : rc3; + if (rc) + QETH_DBF_TEXT_(SETUP, 2, "1err%d", rc); + qdio_free(CARD_DDEV(card)); + if (recover_flag == CARD_STATE_UP) + card->state = CARD_STATE_RECOVER; + /* let user_space know that device is offline */ + kobject_uevent(&cgdev->dev.kobj, KOBJ_CHANGE); + mutex_unlock(&card->conf_mutex); + mutex_unlock(&card->discipline_mutex); + return 0; +} + +static int qeth_l2_set_offline(struct ccwgroup_device *cgdev) +{ + return __qeth_l2_set_offline(cgdev, 0); +} + +static int qeth_l2_recover(void *ptr) +{ + struct qeth_card *card; + int rc = 0; + + card = (struct qeth_card *) ptr; + QETH_CARD_TEXT(card, 2, "recover1"); + if (!qeth_do_run_thread(card, QETH_RECOVER_THREAD)) + return 0; + QETH_CARD_TEXT(card, 2, "recover2"); + dev_warn(&card->gdev->dev, + "A recovery process has been started for the device\n"); + qeth_set_recovery_task(card); + __qeth_l2_set_offline(card->gdev, 1); + rc = __qeth_l2_set_online(card->gdev, 1); + if (!rc) + dev_info(&card->gdev->dev, + "Device successfully recovered!\n"); + else { + qeth_close_dev(card); + dev_warn(&card->gdev->dev, "The qeth device driver " + "failed to recover an error on the device\n"); + } + qeth_clear_recovery_task(card); + qeth_clear_thread_start_bit(card, QETH_RECOVER_THREAD); + qeth_clear_thread_running_bit(card, QETH_RECOVER_THREAD); + return 0; +} + +static int __init qeth_l2_init(void) +{ + pr_info("register layer 2 discipline\n"); + return 0; +} + +static void __exit qeth_l2_exit(void) +{ + pr_info("unregister layer 2 discipline\n"); +} + +static int qeth_l2_pm_suspend(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + + netif_device_detach(card->dev); + qeth_set_allowed_threads(card, 0, 1); + wait_event(card->wait_q, qeth_threads_running(card, 0xffffffff) == 0); + if (gdev->state == CCWGROUP_OFFLINE) + return 0; + if (card->state == CARD_STATE_UP) { + if (card->info.hwtrap) + qeth_hw_trap(card, QETH_DIAGS_TRAP_DISARM); + __qeth_l2_set_offline(card->gdev, 1); + } else + __qeth_l2_set_offline(card->gdev, 0); + return 0; +} + +static int qeth_l2_pm_resume(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + int rc = 0; + + if (gdev->state == CCWGROUP_OFFLINE) + goto out; + + if (card->state == CARD_STATE_RECOVER) { + rc = __qeth_l2_set_online(card->gdev, 1); + if (rc) { + rtnl_lock(); + dev_close(card->dev); + rtnl_unlock(); + } + } else + rc = __qeth_l2_set_online(card->gdev, 0); +out: + qeth_set_allowed_threads(card, 0xffffffff, 0); + netif_device_attach(card->dev); + if (rc) + dev_warn(&card->gdev->dev, "The qeth device driver " + "failed to recover an error on the device\n"); + return rc; +} + +/* Returns zero if the command is successfully "consumed" */ +static int qeth_l2_control_event(struct qeth_card *card, + struct qeth_ipa_cmd *cmd) +{ + switch (cmd->hdr.command) { + case IPA_CMD_SETBRIDGEPORT_OSA: + case IPA_CMD_SETBRIDGEPORT_IQD: + if (cmd->data.sbp.hdr.command_code == + IPA_SBP_BRIDGE_PORT_STATE_CHANGE) { + qeth_bridge_state_change(card, cmd); + return 0; + } else + return 1; + case IPA_CMD_ADDRESS_CHANGE_NOTIF: + qeth_bridge_host_event(card, cmd); + return 0; + default: + return 1; + } +} + +struct qeth_discipline qeth_l2_discipline = { + .devtype = &qeth_l2_devtype, + .process_rx_buffer = qeth_l2_process_inbound_buffer, + .recover = qeth_l2_recover, + .setup = qeth_l2_probe_device, + .remove = qeth_l2_remove_device, + .set_online = qeth_l2_set_online, + .set_offline = qeth_l2_set_offline, + .freeze = qeth_l2_pm_suspend, + .thaw = qeth_l2_pm_resume, + .restore = qeth_l2_pm_resume, + .do_ioctl = NULL, + .control_event_handler = qeth_l2_control_event, +}; +EXPORT_SYMBOL_GPL(qeth_l2_discipline); + +static int qeth_osn_send_control_data(struct qeth_card *card, int len, + struct qeth_cmd_buffer *iob) +{ + struct qeth_channel *channel = iob->channel; + unsigned long flags; + int rc = 0; + + QETH_CARD_TEXT(card, 5, "osndctrd"); + + wait_event(card->wait_q, + atomic_cmpxchg(&channel->irq_pending, 0, 1) == 0); + qeth_prepare_control_data(card, len, iob); + QETH_CARD_TEXT(card, 6, "osnoirqp"); + spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags); + rc = ccw_device_start_timeout(channel->ccwdev, channel->ccw, + (addr_t) iob, 0, 0, QETH_IPA_TIMEOUT); + spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags); + if (rc) { + QETH_DBF_MESSAGE(2, "qeth_osn_send_control_data: " + "ccw_device_start rc = %i\n", rc); + QETH_CARD_TEXT_(card, 2, " err%d", rc); + qeth_release_buffer(channel, iob); + atomic_set(&channel->irq_pending, 0); + wake_up(&card->wait_q); + } + return rc; +} + +static int qeth_osn_send_ipa_cmd(struct qeth_card *card, + struct qeth_cmd_buffer *iob, int data_len) +{ + u16 s1, s2; + + QETH_CARD_TEXT(card, 4, "osndipa"); + + qeth_prepare_ipa_cmd(card, iob); + s1 = (u16)(IPA_PDU_HEADER_SIZE + data_len); + s2 = (u16)data_len; + memcpy(QETH_IPA_PDU_LEN_TOTAL(iob->data), &s1, 2); + memcpy(QETH_IPA_PDU_LEN_PDU1(iob->data), &s2, 2); + memcpy(QETH_IPA_PDU_LEN_PDU2(iob->data), &s2, 2); + memcpy(QETH_IPA_PDU_LEN_PDU3(iob->data), &s2, 2); + return qeth_osn_send_control_data(card, s1, iob); +} + +int qeth_osn_assist(struct net_device *dev, void *data, int data_len) +{ + struct qeth_cmd_buffer *iob; + struct qeth_card *card; + + if (!dev) + return -ENODEV; + card = dev->ml_priv; + if (!card) + return -ENODEV; + QETH_CARD_TEXT(card, 2, "osnsdmc"); + if (!qeth_card_hw_is_reachable(card)) + return -ENODEV; + iob = qeth_wait_for_buffer(&card->write); + memcpy(__ipa_cmd(iob), data, data_len); + return qeth_osn_send_ipa_cmd(card, iob, data_len); +} +EXPORT_SYMBOL(qeth_osn_assist); + +int qeth_osn_register(unsigned char *read_dev_no, struct net_device **dev, + int (*assist_cb)(struct net_device *, void *), + int (*data_cb)(struct sk_buff *)) +{ + struct qeth_card *card; + + *dev = qeth_l2_netdev_by_devno(read_dev_no); + if (*dev == NULL) + return -ENODEV; + card = (*dev)->ml_priv; + if (!card) + return -ENODEV; + QETH_CARD_TEXT(card, 2, "osnreg"); + if ((assist_cb == NULL) || (data_cb == NULL)) + return -EINVAL; + card->osn_info.assist_cb = assist_cb; + card->osn_info.data_cb = data_cb; + return 0; +} +EXPORT_SYMBOL(qeth_osn_register); + +void qeth_osn_deregister(struct net_device *dev) +{ + struct qeth_card *card; + + if (!dev) + return; + card = dev->ml_priv; + if (!card) + return; + QETH_CARD_TEXT(card, 2, "osndereg"); + card->osn_info.assist_cb = NULL; + card->osn_info.data_cb = NULL; + return; +} +EXPORT_SYMBOL(qeth_osn_deregister); + +/* SETBRIDGEPORT support, async notifications */ + +enum qeth_an_event_type {anev_reg_unreg, anev_abort, anev_reset}; + +/** + * qeth_bridge_emit_host_event() - bridgeport address change notification + * @card: qeth_card structure pointer, for udev events. + * @evtype: "normal" register/unregister, or abort, or reset. For abort + * and reset token and addr_lnid are unused and may be NULL. + * @code: event bitmask: high order bit 0x80 value 1 means removal of an + * object, 0 - addition of an object. + * 0x01 - VLAN, 0x02 - MAC, 0x03 - VLAN and MAC. + * @token: "network token" structure identifying physical address of the port. + * @addr_lnid: pointer to structure with MAC address and VLAN ID. + * + * This function is called when registrations and deregistrations are + * reported by the hardware, and also when notifications are enabled - + * for all currently registered addresses. + */ +static void qeth_bridge_emit_host_event(struct qeth_card *card, + enum qeth_an_event_type evtype, + u8 code, struct net_if_token *token, struct mac_addr_lnid *addr_lnid) +{ + char str[7][32]; + char *env[8]; + int i = 0; + + switch (evtype) { + case anev_reg_unreg: + snprintf(str[i], sizeof(str[i]), "BRIDGEDHOST=%s", + (code & IPA_ADDR_CHANGE_CODE_REMOVAL) + ? "deregister" : "register"); + env[i] = str[i]; i++; + if (code & IPA_ADDR_CHANGE_CODE_VLANID) { + snprintf(str[i], sizeof(str[i]), "VLAN=%d", + addr_lnid->lnid); + env[i] = str[i]; i++; + } + if (code & IPA_ADDR_CHANGE_CODE_MACADDR) { + snprintf(str[i], sizeof(str[i]), "MAC=%pM", + addr_lnid->mac); + env[i] = str[i]; i++; + } + snprintf(str[i], sizeof(str[i]), "NTOK_BUSID=%x.%x.%04x", + token->cssid, token->ssid, token->devnum); + env[i] = str[i]; i++; + snprintf(str[i], sizeof(str[i]), "NTOK_IID=%02x", token->iid); + env[i] = str[i]; i++; + snprintf(str[i], sizeof(str[i]), "NTOK_CHPID=%02x", + token->chpid); + env[i] = str[i]; i++; + snprintf(str[i], sizeof(str[i]), "NTOK_CHID=%04x", token->chid); + env[i] = str[i]; i++; + break; + case anev_abort: + snprintf(str[i], sizeof(str[i]), "BRIDGEDHOST=abort"); + env[i] = str[i]; i++; + break; + case anev_reset: + snprintf(str[i], sizeof(str[i]), "BRIDGEDHOST=reset"); + env[i] = str[i]; i++; + break; + } + env[i] = NULL; + kobject_uevent_env(&card->gdev->dev.kobj, KOBJ_CHANGE, env); +} + +struct qeth_bridge_state_data { + struct work_struct worker; + struct qeth_card *card; + struct qeth_sbp_state_change qports; +}; + +static void qeth_bridge_state_change_worker(struct work_struct *work) +{ + struct qeth_bridge_state_data *data = + container_of(work, struct qeth_bridge_state_data, worker); + /* We are only interested in the first entry - local port */ + struct qeth_sbp_port_entry *entry = &data->qports.entry[0]; + char env_locrem[32]; + char env_role[32]; + char env_state[32]; + char *env[] = { + env_locrem, + env_role, + env_state, + NULL + }; + + /* Role should not change by itself, but if it did, */ + /* information from the hardware is authoritative. */ + mutex_lock(&data->card->conf_mutex); + data->card->options.sbp.role = entry->role; + mutex_unlock(&data->card->conf_mutex); + + snprintf(env_locrem, sizeof(env_locrem), "BRIDGEPORT=statechange"); + snprintf(env_role, sizeof(env_role), "ROLE=%s", + (entry->role == QETH_SBP_ROLE_NONE) ? "none" : + (entry->role == QETH_SBP_ROLE_PRIMARY) ? "primary" : + (entry->role == QETH_SBP_ROLE_SECONDARY) ? "secondary" : + ""); + snprintf(env_state, sizeof(env_state), "STATE=%s", + (entry->state == QETH_SBP_STATE_INACTIVE) ? "inactive" : + (entry->state == QETH_SBP_STATE_STANDBY) ? "standby" : + (entry->state == QETH_SBP_STATE_ACTIVE) ? "active" : + ""); + kobject_uevent_env(&data->card->gdev->dev.kobj, + KOBJ_CHANGE, env); + kfree(data); +} + +static void qeth_bridge_state_change(struct qeth_card *card, + struct qeth_ipa_cmd *cmd) +{ + struct qeth_sbp_state_change *qports = + &cmd->data.sbp.data.state_change; + struct qeth_bridge_state_data *data; + int extrasize; + + QETH_CARD_TEXT(card, 2, "brstchng"); + if (qports->num_entries == 0) { + QETH_CARD_TEXT(card, 2, "BPempty"); + return; + } + if (qports->entry_length != sizeof(struct qeth_sbp_port_entry)) { + QETH_CARD_TEXT_(card, 2, "BPsz%04x", qports->entry_length); + return; + } + extrasize = sizeof(struct qeth_sbp_port_entry) * qports->num_entries; + data = kzalloc(sizeof(struct qeth_bridge_state_data) + extrasize, + GFP_ATOMIC); + if (!data) { + QETH_CARD_TEXT(card, 2, "BPSalloc"); + return; + } + INIT_WORK(&data->worker, qeth_bridge_state_change_worker); + data->card = card; + memcpy(&data->qports, qports, + sizeof(struct qeth_sbp_state_change) + extrasize); + queue_work(qeth_wq, &data->worker); +} + +struct qeth_bridge_host_data { + struct work_struct worker; + struct qeth_card *card; + struct qeth_ipacmd_addr_change hostevs; +}; + +static void qeth_bridge_host_event_worker(struct work_struct *work) +{ + struct qeth_bridge_host_data *data = + container_of(work, struct qeth_bridge_host_data, worker); + int i; + + if (data->hostevs.lost_event_mask) { + dev_info(&data->card->gdev->dev, +"Address notification from the Bridge Port stopped %s (%s)\n", + data->card->dev->name, + (data->hostevs.lost_event_mask == 0x01) + ? "Overflow" + : (data->hostevs.lost_event_mask == 0x02) + ? "Bridge port state change" + : "Unknown reason"); + mutex_lock(&data->card->conf_mutex); + data->card->options.sbp.hostnotification = 0; + mutex_unlock(&data->card->conf_mutex); + qeth_bridge_emit_host_event(data->card, anev_abort, + 0, NULL, NULL); + } else + for (i = 0; i < data->hostevs.num_entries; i++) { + struct qeth_ipacmd_addr_change_entry *entry = + &data->hostevs.entry[i]; + qeth_bridge_emit_host_event(data->card, + anev_reg_unreg, + entry->change_code, + &entry->token, &entry->addr_lnid); + } + kfree(data); +} + +static void qeth_bridge_host_event(struct qeth_card *card, + struct qeth_ipa_cmd *cmd) +{ + struct qeth_ipacmd_addr_change *hostevs = + &cmd->data.addrchange; + struct qeth_bridge_host_data *data; + int extrasize; + + QETH_CARD_TEXT(card, 2, "brhostev"); + if (cmd->hdr.return_code != 0x0000) { + if (cmd->hdr.return_code == 0x0010) { + if (hostevs->lost_event_mask == 0x00) + hostevs->lost_event_mask = 0xff; + } else { + QETH_CARD_TEXT_(card, 2, "BPHe%04x", + cmd->hdr.return_code); + return; + } + } + extrasize = sizeof(struct qeth_ipacmd_addr_change_entry) * + hostevs->num_entries; + data = kzalloc(sizeof(struct qeth_bridge_host_data) + extrasize, + GFP_ATOMIC); + if (!data) { + QETH_CARD_TEXT(card, 2, "BPHalloc"); + return; + } + INIT_WORK(&data->worker, qeth_bridge_host_event_worker); + data->card = card; + memcpy(&data->hostevs, hostevs, + sizeof(struct qeth_ipacmd_addr_change) + extrasize); + queue_work(qeth_wq, &data->worker); +} + +/* SETBRIDGEPORT support; sending commands */ + +struct _qeth_sbp_cbctl { + u16 ipa_rc; + u16 cmd_rc; + union { + u32 supported; + struct { + enum qeth_sbp_roles *role; + enum qeth_sbp_states *state; + } qports; + } data; +}; + +/** + * qeth_bridgeport_makerc() - derive "traditional" error from hardware codes. + * @card: qeth_card structure pointer, for debug messages. + * @cbctl: state structure with hardware return codes. + * @setcmd: IPA command code + * + * Returns negative errno-compatible error indication or 0 on success. + */ +static int qeth_bridgeport_makerc(struct qeth_card *card, + struct _qeth_sbp_cbctl *cbctl, enum qeth_ipa_sbp_cmd setcmd) +{ + int rc; + int is_iqd = (card->info.type == QETH_CARD_TYPE_IQD); + + if ((is_iqd && (cbctl->ipa_rc == IPA_RC_SUCCESS)) || + (!is_iqd && (cbctl->ipa_rc == cbctl->cmd_rc))) + switch (cbctl->cmd_rc) { + case IPA_RC_SUCCESS: + rc = 0; + break; + case IPA_RC_L2_UNSUPPORTED_CMD: + case IPA_RC_UNSUPPORTED_COMMAND: + rc = -EOPNOTSUPP; + break; + case IPA_RC_SBP_OSA_NOT_CONFIGURED: + case IPA_RC_SBP_IQD_NOT_CONFIGURED: + rc = -ENODEV; /* maybe not the best code here? */ + dev_err(&card->gdev->dev, + "The device is not configured as a Bridge Port\n"); + break; + case IPA_RC_SBP_OSA_OS_MISMATCH: + case IPA_RC_SBP_IQD_OS_MISMATCH: + rc = -EPERM; + dev_err(&card->gdev->dev, + "A Bridge Port is already configured by a different operating system\n"); + break; + case IPA_RC_SBP_OSA_ANO_DEV_PRIMARY: + case IPA_RC_SBP_IQD_ANO_DEV_PRIMARY: + switch (setcmd) { + case IPA_SBP_SET_PRIMARY_BRIDGE_PORT: + rc = -EEXIST; + dev_err(&card->gdev->dev, + "The LAN already has a primary Bridge Port\n"); + break; + case IPA_SBP_SET_SECONDARY_BRIDGE_PORT: + rc = -EBUSY; + dev_err(&card->gdev->dev, + "The device is already a primary Bridge Port\n"); + break; + default: + rc = -EIO; + } + break; + case IPA_RC_SBP_OSA_CURRENT_SECOND: + case IPA_RC_SBP_IQD_CURRENT_SECOND: + rc = -EBUSY; + dev_err(&card->gdev->dev, + "The device is already a secondary Bridge Port\n"); + break; + case IPA_RC_SBP_OSA_LIMIT_SECOND: + case IPA_RC_SBP_IQD_LIMIT_SECOND: + rc = -EEXIST; + dev_err(&card->gdev->dev, + "The LAN cannot have more secondary Bridge Ports\n"); + break; + case IPA_RC_SBP_OSA_CURRENT_PRIMARY: + case IPA_RC_SBP_IQD_CURRENT_PRIMARY: + rc = -EBUSY; + dev_err(&card->gdev->dev, + "The device is already a primary Bridge Port\n"); + break; + case IPA_RC_SBP_OSA_NOT_AUTHD_BY_ZMAN: + case IPA_RC_SBP_IQD_NOT_AUTHD_BY_ZMAN: + rc = -EACCES; + dev_err(&card->gdev->dev, + "The device is not authorized to be a Bridge Port\n"); + break; + default: + rc = -EIO; + } + else + switch (cbctl->ipa_rc) { + case IPA_RC_NOTSUPP: + rc = -EOPNOTSUPP; + break; + case IPA_RC_UNSUPPORTED_COMMAND: + rc = -EOPNOTSUPP; + break; + default: + rc = -EIO; + } + + if (rc) { + QETH_CARD_TEXT_(card, 2, "SBPi%04x", cbctl->ipa_rc); + QETH_CARD_TEXT_(card, 2, "SBPc%04x", cbctl->cmd_rc); + } + return rc; +} + +static struct qeth_cmd_buffer *qeth_sbp_build_cmd(struct qeth_card *card, + enum qeth_ipa_sbp_cmd sbp_cmd, + unsigned int cmd_length) +{ + enum qeth_ipa_cmds ipa_cmd = (card->info.type == QETH_CARD_TYPE_IQD) ? + IPA_CMD_SETBRIDGEPORT_IQD : + IPA_CMD_SETBRIDGEPORT_OSA; + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + iob = qeth_get_ipacmd_buffer(card, ipa_cmd, 0); + if (!iob) + return iob; + cmd = __ipa_cmd(iob); + cmd->data.sbp.hdr.cmdlength = sizeof(struct qeth_ipacmd_sbp_hdr) + + cmd_length; + cmd->data.sbp.hdr.command_code = sbp_cmd; + cmd->data.sbp.hdr.used_total = 1; + cmd->data.sbp.hdr.seq_no = 1; + return iob; +} + +static int qeth_bridgeport_query_support_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + struct _qeth_sbp_cbctl *cbctl = (struct _qeth_sbp_cbctl *)reply->param; + QETH_CARD_TEXT(card, 2, "brqsupcb"); + cbctl->ipa_rc = cmd->hdr.return_code; + cbctl->cmd_rc = cmd->data.sbp.hdr.return_code; + if ((cbctl->ipa_rc == 0) && (cbctl->cmd_rc == 0)) { + cbctl->data.supported = + cmd->data.sbp.data.query_cmds_supp.supported_cmds; + } else { + cbctl->data.supported = 0; + } + return 0; +} + +/** + * qeth_bridgeport_query_support() - store bitmask of supported subfunctions. + * @card: qeth_card structure pointer. + * + * Sets bitmask of supported setbridgeport subfunctions in the qeth_card + * strucutre: card->options.sbp.supported_funcs. + */ +static void qeth_bridgeport_query_support(struct qeth_card *card) +{ + struct qeth_cmd_buffer *iob; + struct _qeth_sbp_cbctl cbctl; + + QETH_CARD_TEXT(card, 2, "brqsuppo"); + iob = qeth_sbp_build_cmd(card, IPA_SBP_QUERY_COMMANDS_SUPPORTED, + sizeof(struct qeth_sbp_query_cmds_supp)); + if (!iob) + return; + if (qeth_send_ipa_cmd(card, iob, qeth_bridgeport_query_support_cb, + (void *)&cbctl) || + qeth_bridgeport_makerc(card, &cbctl, + IPA_SBP_QUERY_COMMANDS_SUPPORTED)) { + /* non-zero makerc signifies failure, and produce messages */ + card->options.sbp.role = QETH_SBP_ROLE_NONE; + return; + } + card->options.sbp.supported_funcs = cbctl.data.supported; +} + +static int qeth_bridgeport_query_ports_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + struct qeth_sbp_query_ports *qports = &cmd->data.sbp.data.query_ports; + struct _qeth_sbp_cbctl *cbctl = (struct _qeth_sbp_cbctl *)reply->param; + + QETH_CARD_TEXT(card, 2, "brqprtcb"); + cbctl->ipa_rc = cmd->hdr.return_code; + cbctl->cmd_rc = cmd->data.sbp.hdr.return_code; + if ((cbctl->ipa_rc != 0) || (cbctl->cmd_rc != 0)) + return 0; + if (qports->entry_length != sizeof(struct qeth_sbp_port_entry)) { + cbctl->cmd_rc = 0xffff; + QETH_CARD_TEXT_(card, 2, "SBPs%04x", qports->entry_length); + return 0; + } + /* first entry contains the state of the local port */ + if (qports->num_entries > 0) { + if (cbctl->data.qports.role) + *cbctl->data.qports.role = qports->entry[0].role; + if (cbctl->data.qports.state) + *cbctl->data.qports.state = qports->entry[0].state; + } + return 0; +} + +/** + * qeth_bridgeport_query_ports() - query local bridgeport status. + * @card: qeth_card structure pointer. + * @role: Role of the port: 0-none, 1-primary, 2-secondary. + * @state: State of the port: 0-inactive, 1-standby, 2-active. + * + * Returns negative errno-compatible error indication or 0 on success. + * + * 'role' and 'state' are not updated in case of hardware operation failure. + */ +int qeth_bridgeport_query_ports(struct qeth_card *card, + enum qeth_sbp_roles *role, enum qeth_sbp_states *state) +{ + int rc = 0; + struct qeth_cmd_buffer *iob; + struct _qeth_sbp_cbctl cbctl = { + .data = { + .qports = { + .role = role, + .state = state, + }, + }, + }; + + QETH_CARD_TEXT(card, 2, "brqports"); + if (!(card->options.sbp.supported_funcs & IPA_SBP_QUERY_BRIDGE_PORTS)) + return -EOPNOTSUPP; + iob = qeth_sbp_build_cmd(card, IPA_SBP_QUERY_BRIDGE_PORTS, 0); + if (!iob) + return -ENOMEM; + rc = qeth_send_ipa_cmd(card, iob, qeth_bridgeport_query_ports_cb, + (void *)&cbctl); + if (rc < 0) + return rc; + return qeth_bridgeport_makerc(card, &cbctl, IPA_SBP_QUERY_BRIDGE_PORTS); +} + +static int qeth_bridgeport_set_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *)data; + struct _qeth_sbp_cbctl *cbctl = (struct _qeth_sbp_cbctl *)reply->param; + QETH_CARD_TEXT(card, 2, "brsetrcb"); + cbctl->ipa_rc = cmd->hdr.return_code; + cbctl->cmd_rc = cmd->data.sbp.hdr.return_code; + return 0; +} + +/** + * qeth_bridgeport_setrole() - Assign primary role to the port. + * @card: qeth_card structure pointer. + * @role: Role to assign. + * + * Returns negative errno-compatible error indication or 0 on success. + */ +int qeth_bridgeport_setrole(struct qeth_card *card, enum qeth_sbp_roles role) +{ + int rc = 0; + int cmdlength; + struct qeth_cmd_buffer *iob; + struct _qeth_sbp_cbctl cbctl; + enum qeth_ipa_sbp_cmd setcmd; + + QETH_CARD_TEXT(card, 2, "brsetrol"); + switch (role) { + case QETH_SBP_ROLE_NONE: + setcmd = IPA_SBP_RESET_BRIDGE_PORT_ROLE; + cmdlength = sizeof(struct qeth_sbp_reset_role); + break; + case QETH_SBP_ROLE_PRIMARY: + setcmd = IPA_SBP_SET_PRIMARY_BRIDGE_PORT; + cmdlength = sizeof(struct qeth_sbp_set_primary); + break; + case QETH_SBP_ROLE_SECONDARY: + setcmd = IPA_SBP_SET_SECONDARY_BRIDGE_PORT; + cmdlength = sizeof(struct qeth_sbp_set_secondary); + break; + default: + return -EINVAL; + } + if (!(card->options.sbp.supported_funcs & setcmd)) + return -EOPNOTSUPP; + iob = qeth_sbp_build_cmd(card, setcmd, cmdlength); + if (!iob) + return -ENOMEM; + rc = qeth_send_ipa_cmd(card, iob, qeth_bridgeport_set_cb, + (void *)&cbctl); + if (rc < 0) + return rc; + return qeth_bridgeport_makerc(card, &cbctl, setcmd); +} + +/** + * qeth_anset_makerc() - derive "traditional" error from hardware codes. + * @card: qeth_card structure pointer, for debug messages. + * + * Returns negative errno-compatible error indication or 0 on success. + */ +static int qeth_anset_makerc(struct qeth_card *card, int pnso_rc, u16 response) +{ + int rc; + + if (pnso_rc == 0) + switch (response) { + case 0x0001: + rc = 0; + break; + case 0x0004: + case 0x0100: + case 0x0106: + rc = -EOPNOTSUPP; + dev_err(&card->gdev->dev, + "Setting address notification failed\n"); + break; + case 0x0107: + rc = -EAGAIN; + break; + default: + rc = -EIO; + } + else + rc = -EIO; + + if (rc) { + QETH_CARD_TEXT_(card, 2, "SBPp%04x", pnso_rc); + QETH_CARD_TEXT_(card, 2, "SBPr%04x", response); + } + return rc; +} + +static void qeth_bridgeport_an_set_cb(void *priv, + enum qdio_brinfo_entry_type type, void *entry) +{ + struct qeth_card *card = (struct qeth_card *)priv; + struct qdio_brinfo_entry_l2 *l2entry; + u8 code; + + if (type != l2_addr_lnid) { + WARN_ON_ONCE(1); + return; + } + + l2entry = (struct qdio_brinfo_entry_l2 *)entry; + code = IPA_ADDR_CHANGE_CODE_MACADDR; + if (l2entry->addr_lnid.lnid < VLAN_N_VID) + code |= IPA_ADDR_CHANGE_CODE_VLANID; + qeth_bridge_emit_host_event(card, anev_reg_unreg, code, + (struct net_if_token *)&l2entry->nit, + (struct mac_addr_lnid *)&l2entry->addr_lnid); +} + +/** + * qeth_bridgeport_an_set() - Enable or disable bridgeport address notification + * @card: qeth_card structure pointer. + * @enable: 0 - disable, non-zero - enable notifications + * + * Returns negative errno-compatible error indication or 0 on success. + * + * On enable, emits a series of address notifications udev events for all + * currently registered hosts. + */ +int qeth_bridgeport_an_set(struct qeth_card *card, int enable) +{ + int rc; + u16 response; + struct ccw_device *ddev; + struct subchannel_id schid; + + if (!card) + return -EINVAL; + if (!card->options.sbp.supported_funcs) + return -EOPNOTSUPP; + ddev = CARD_DDEV(card); + ccw_device_get_schid(ddev, &schid); + + if (enable) { + qeth_bridge_emit_host_event(card, anev_reset, 0, NULL, NULL); + rc = qdio_pnso_brinfo(schid, 1, &response, + qeth_bridgeport_an_set_cb, card); + } else + rc = qdio_pnso_brinfo(schid, 0, &response, NULL, NULL); + return qeth_anset_makerc(card, rc, response); +} + +static bool qeth_bridgeport_is_in_use(struct qeth_card *card) +{ + return (card->options.sbp.role || card->options.sbp.reflect_promisc || + card->options.sbp.hostnotification); +} + +/* VNIC Characteristics support */ + +/* handle VNICC IPA command return codes; convert to error codes */ +static int qeth_l2_vnicc_makerc(struct qeth_card *card, int ipa_rc) +{ + int rc; + + switch (ipa_rc) { + case IPA_RC_SUCCESS: + return ipa_rc; + case IPA_RC_L2_UNSUPPORTED_CMD: + case IPA_RC_NOTSUPP: + rc = -EOPNOTSUPP; + break; + case IPA_RC_VNICC_OOSEQ: + rc = -EALREADY; + break; + case IPA_RC_VNICC_VNICBP: + rc = -EBUSY; + break; + case IPA_RC_L2_ADDR_TABLE_FULL: + rc = -ENOSPC; + break; + case IPA_RC_L2_MAC_NOT_AUTH_BY_ADP: + rc = -EACCES; + break; + default: + rc = -EIO; + } + + QETH_CARD_TEXT_(card, 2, "err%04x", ipa_rc); + return rc; +} + +/* generic VNICC request call back control */ +struct _qeth_l2_vnicc_request_cbctl { + u32 sub_cmd; + struct { + u32 vnic_char; + u32 timeout; + } param; + struct { + union{ + u32 *sup_cmds; + u32 *timeout; + }; + } result; +}; + +/* generic VNICC request call back */ +static int qeth_l2_vnicc_request_cb(struct qeth_card *card, + struct qeth_reply *reply, + unsigned long data) +{ + struct _qeth_l2_vnicc_request_cbctl *cbctl = + (struct _qeth_l2_vnicc_request_cbctl *) reply->param; + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + struct qeth_ipacmd_vnicc *rep = &cmd->data.vnicc; + + QETH_CARD_TEXT(card, 2, "vniccrcb"); + if (cmd->hdr.return_code) + return 0; + /* return results to caller */ + card->options.vnicc.sup_chars = rep->hdr.sup; + card->options.vnicc.cur_chars = rep->hdr.cur; + + if (cbctl->sub_cmd == IPA_VNICC_QUERY_CMDS) + *cbctl->result.sup_cmds = rep->query_cmds.sup_cmds; + + if (cbctl->sub_cmd == IPA_VNICC_GET_TIMEOUT) + *cbctl->result.timeout = rep->getset_timeout.timeout; + + return 0; +} + +/* generic VNICC request */ +static int qeth_l2_vnicc_request(struct qeth_card *card, + struct _qeth_l2_vnicc_request_cbctl *cbctl) +{ + struct qeth_ipacmd_vnicc *req; + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + int rc; + + QETH_CARD_TEXT(card, 2, "vniccreq"); + + /* get new buffer for request */ + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_VNICC, 0); + if (!iob) + return -ENOMEM; + + /* create header for request */ + cmd = __ipa_cmd(iob); + req = &cmd->data.vnicc; + + /* create sub command header for request */ + req->sub_hdr.data_length = sizeof(req->sub_hdr); + req->sub_hdr.sub_command = cbctl->sub_cmd; + + /* create sub command specific request fields */ + switch (cbctl->sub_cmd) { + case IPA_VNICC_QUERY_CHARS: + break; + case IPA_VNICC_QUERY_CMDS: + req->sub_hdr.data_length += sizeof(req->query_cmds); + req->query_cmds.vnic_char = cbctl->param.vnic_char; + break; + case IPA_VNICC_ENABLE: + case IPA_VNICC_DISABLE: + req->sub_hdr.data_length += sizeof(req->set_char); + req->set_char.vnic_char = cbctl->param.vnic_char; + break; + case IPA_VNICC_SET_TIMEOUT: + req->getset_timeout.timeout = cbctl->param.timeout; + /* fallthrough */ + case IPA_VNICC_GET_TIMEOUT: + req->sub_hdr.data_length += sizeof(req->getset_timeout); + req->getset_timeout.vnic_char = cbctl->param.vnic_char; + break; + default: + qeth_release_buffer(iob->channel, iob); + return -EOPNOTSUPP; + } + + /* send request */ + rc = qeth_send_ipa_cmd(card, iob, qeth_l2_vnicc_request_cb, + (void *) cbctl); + + return qeth_l2_vnicc_makerc(card, rc); +} + +/* VNICC query VNIC characteristics request */ +static int qeth_l2_vnicc_query_chars(struct qeth_card *card) +{ + struct _qeth_l2_vnicc_request_cbctl cbctl; + + /* prepare callback control */ + cbctl.sub_cmd = IPA_VNICC_QUERY_CHARS; + + QETH_CARD_TEXT(card, 2, "vniccqch"); + return qeth_l2_vnicc_request(card, &cbctl); +} + +/* VNICC query sub commands request */ +static int qeth_l2_vnicc_query_cmds(struct qeth_card *card, u32 vnic_char, + u32 *sup_cmds) +{ + struct _qeth_l2_vnicc_request_cbctl cbctl; + + /* prepare callback control */ + cbctl.sub_cmd = IPA_VNICC_QUERY_CMDS; + cbctl.param.vnic_char = vnic_char; + cbctl.result.sup_cmds = sup_cmds; + + QETH_CARD_TEXT(card, 2, "vniccqcm"); + return qeth_l2_vnicc_request(card, &cbctl); +} + +/* VNICC enable/disable characteristic request */ +static int qeth_l2_vnicc_set_char(struct qeth_card *card, u32 vnic_char, + u32 cmd) +{ + struct _qeth_l2_vnicc_request_cbctl cbctl; + + /* prepare callback control */ + cbctl.sub_cmd = cmd; + cbctl.param.vnic_char = vnic_char; + + QETH_CARD_TEXT(card, 2, "vniccedc"); + return qeth_l2_vnicc_request(card, &cbctl); +} + +/* VNICC get/set timeout for characteristic request */ +static int qeth_l2_vnicc_getset_timeout(struct qeth_card *card, u32 vnicc, + u32 cmd, u32 *timeout) +{ + struct _qeth_l2_vnicc_request_cbctl cbctl; + + /* prepare callback control */ + cbctl.sub_cmd = cmd; + cbctl.param.vnic_char = vnicc; + if (cmd == IPA_VNICC_SET_TIMEOUT) + cbctl.param.timeout = *timeout; + if (cmd == IPA_VNICC_GET_TIMEOUT) + cbctl.result.timeout = timeout; + + QETH_CARD_TEXT(card, 2, "vniccgst"); + return qeth_l2_vnicc_request(card, &cbctl); +} + +/* set current VNICC flag state; called from sysfs store function */ +int qeth_l2_vnicc_set_state(struct qeth_card *card, u32 vnicc, bool state) +{ + int rc = 0; + u32 cmd; + + QETH_CARD_TEXT(card, 2, "vniccsch"); + + /* check if characteristic and enable/disable are supported */ + if (!(card->options.vnicc.sup_chars & vnicc) || + !(card->options.vnicc.set_char_sup & vnicc)) + return -EOPNOTSUPP; + + if (qeth_bridgeport_is_in_use(card)) + return -EBUSY; + + /* set enable/disable command and store wanted characteristic */ + if (state) { + cmd = IPA_VNICC_ENABLE; + card->options.vnicc.wanted_chars |= vnicc; + } else { + cmd = IPA_VNICC_DISABLE; + card->options.vnicc.wanted_chars &= ~vnicc; + } + + /* do we need to do anything? */ + if (card->options.vnicc.cur_chars == card->options.vnicc.wanted_chars) + return rc; + + /* if card is not ready, simply stop here */ + if (!qeth_card_hw_is_reachable(card)) { + if (state) + card->options.vnicc.cur_chars |= vnicc; + else + card->options.vnicc.cur_chars &= ~vnicc; + return rc; + } + + rc = qeth_l2_vnicc_set_char(card, vnicc, cmd); + if (rc) + card->options.vnicc.wanted_chars = + card->options.vnicc.cur_chars; + else { + /* successful online VNICC change; handle special cases */ + if (state && vnicc == QETH_VNICC_RX_BCAST) + card->options.vnicc.rx_bcast_enabled = true; + if (!state && vnicc == QETH_VNICC_LEARNING) + qeth_l2_vnicc_recover_timeout(card, vnicc, + &card->options.vnicc.learning_timeout); + } + + return rc; +} + +/* get current VNICC flag state; called from sysfs show function */ +int qeth_l2_vnicc_get_state(struct qeth_card *card, u32 vnicc, bool *state) +{ + int rc = 0; + + QETH_CARD_TEXT(card, 2, "vniccgch"); + + /* check if characteristic is supported */ + if (!(card->options.vnicc.sup_chars & vnicc)) + return -EOPNOTSUPP; + + if (qeth_bridgeport_is_in_use(card)) + return -EBUSY; + + /* if card is ready, query current VNICC state */ + if (qeth_card_hw_is_reachable(card)) + rc = qeth_l2_vnicc_query_chars(card); + + *state = (card->options.vnicc.cur_chars & vnicc) ? true : false; + return rc; +} + +/* set VNICC timeout; called from sysfs store function. Currently, only learning + * supports timeout + */ +int qeth_l2_vnicc_set_timeout(struct qeth_card *card, u32 timeout) +{ + int rc = 0; + + QETH_CARD_TEXT(card, 2, "vniccsto"); + + /* check if characteristic and set_timeout are supported */ + if (!(card->options.vnicc.sup_chars & QETH_VNICC_LEARNING) || + !(card->options.vnicc.getset_timeout_sup & QETH_VNICC_LEARNING)) + return -EOPNOTSUPP; + + if (qeth_bridgeport_is_in_use(card)) + return -EBUSY; + + /* do we need to do anything? */ + if (card->options.vnicc.learning_timeout == timeout) + return rc; + + /* if card is not ready, simply store the value internally and return */ + if (!qeth_card_hw_is_reachable(card)) { + card->options.vnicc.learning_timeout = timeout; + return rc; + } + + /* send timeout value to card; if successful, store value internally */ + rc = qeth_l2_vnicc_getset_timeout(card, QETH_VNICC_LEARNING, + IPA_VNICC_SET_TIMEOUT, &timeout); + if (!rc) + card->options.vnicc.learning_timeout = timeout; + + return rc; +} + +/* get current VNICC timeout; called from sysfs show function. Currently, only + * learning supports timeout + */ +int qeth_l2_vnicc_get_timeout(struct qeth_card *card, u32 *timeout) +{ + int rc = 0; + + QETH_CARD_TEXT(card, 2, "vniccgto"); + + /* check if characteristic and get_timeout are supported */ + if (!(card->options.vnicc.sup_chars & QETH_VNICC_LEARNING) || + !(card->options.vnicc.getset_timeout_sup & QETH_VNICC_LEARNING)) + return -EOPNOTSUPP; + + if (qeth_bridgeport_is_in_use(card)) + return -EBUSY; + + /* if card is ready, get timeout. Otherwise, just return stored value */ + *timeout = card->options.vnicc.learning_timeout; + if (qeth_card_hw_is_reachable(card)) + rc = qeth_l2_vnicc_getset_timeout(card, QETH_VNICC_LEARNING, + IPA_VNICC_GET_TIMEOUT, + timeout); + + return rc; +} + +/* check if VNICC is currently enabled */ +bool qeth_l2_vnicc_is_in_use(struct qeth_card *card) +{ + if (!card->options.vnicc.sup_chars) + return false; + /* default values are only OK if rx_bcast was not enabled by user + * or the card is offline. + */ + if (card->options.vnicc.cur_chars == QETH_VNICC_DEFAULT) { + if (!card->options.vnicc.rx_bcast_enabled || + !qeth_card_hw_is_reachable(card)) + return false; + } + return true; +} + +/* recover user timeout setting */ +static bool qeth_l2_vnicc_recover_timeout(struct qeth_card *card, u32 vnicc, + u32 *timeout) +{ + if (card->options.vnicc.sup_chars & vnicc && + card->options.vnicc.getset_timeout_sup & vnicc && + !qeth_l2_vnicc_getset_timeout(card, vnicc, IPA_VNICC_SET_TIMEOUT, + timeout)) + return false; + *timeout = QETH_VNICC_DEFAULT_TIMEOUT; + return true; +} + +/* recover user characteristic setting */ +static bool qeth_l2_vnicc_recover_char(struct qeth_card *card, u32 vnicc, + bool enable) +{ + u32 cmd = enable ? IPA_VNICC_ENABLE : IPA_VNICC_DISABLE; + + if (card->options.vnicc.sup_chars & vnicc && + card->options.vnicc.set_char_sup & vnicc && + !qeth_l2_vnicc_set_char(card, vnicc, cmd)) + return false; + card->options.vnicc.wanted_chars &= ~vnicc; + card->options.vnicc.wanted_chars |= QETH_VNICC_DEFAULT & vnicc; + return true; +} + +/* (re-)initialize VNICC */ +static void qeth_l2_vnicc_init(struct qeth_card *card) +{ + u32 *timeout = &card->options.vnicc.learning_timeout; + bool enable, error = false; + unsigned int chars_len, i; + unsigned long chars_tmp; + u32 sup_cmds, vnicc; + + QETH_CARD_TEXT(card, 2, "vniccini"); + /* reset rx_bcast */ + card->options.vnicc.rx_bcast_enabled = 0; + /* initial query and storage of VNIC characteristics */ + if (qeth_l2_vnicc_query_chars(card)) { + if (card->options.vnicc.wanted_chars != QETH_VNICC_DEFAULT || + *timeout != QETH_VNICC_DEFAULT_TIMEOUT) + dev_err(&card->gdev->dev, "Configuring the VNIC characteristics failed\n"); + /* fail quietly if user didn't change the default config */ + card->options.vnicc.sup_chars = 0; + card->options.vnicc.cur_chars = 0; + card->options.vnicc.wanted_chars = QETH_VNICC_DEFAULT; + return; + } + /* get supported commands for each supported characteristic */ + chars_tmp = card->options.vnicc.sup_chars; + chars_len = sizeof(card->options.vnicc.sup_chars) * BITS_PER_BYTE; + for_each_set_bit(i, &chars_tmp, chars_len) { + vnicc = BIT(i); + if (qeth_l2_vnicc_query_cmds(card, vnicc, &sup_cmds)) { + sup_cmds = 0; + error = true; + } + if ((sup_cmds & IPA_VNICC_SET_TIMEOUT) && + (sup_cmds & IPA_VNICC_GET_TIMEOUT)) + card->options.vnicc.getset_timeout_sup |= vnicc; + else + card->options.vnicc.getset_timeout_sup &= ~vnicc; + if ((sup_cmds & IPA_VNICC_ENABLE) && + (sup_cmds & IPA_VNICC_DISABLE)) + card->options.vnicc.set_char_sup |= vnicc; + else + card->options.vnicc.set_char_sup &= ~vnicc; + } + /* enforce assumed default values and recover settings, if changed */ + error |= qeth_l2_vnicc_recover_timeout(card, QETH_VNICC_LEARNING, + timeout); + chars_tmp = card->options.vnicc.wanted_chars ^ QETH_VNICC_DEFAULT; + chars_len = sizeof(card->options.vnicc.wanted_chars) * BITS_PER_BYTE; + for_each_set_bit(i, &chars_tmp, chars_len) { + vnicc = BIT(i); + enable = card->options.vnicc.wanted_chars & vnicc; + error |= qeth_l2_vnicc_recover_char(card, vnicc, enable); + } + if (error) + dev_err(&card->gdev->dev, "Configuring the VNIC characteristics failed\n"); +} + +/* configure default values of VNIC characteristics */ +static void qeth_l2_vnicc_set_defaults(struct qeth_card *card) +{ + /* characteristics values */ + card->options.vnicc.sup_chars = QETH_VNICC_ALL; + card->options.vnicc.cur_chars = QETH_VNICC_DEFAULT; + card->options.vnicc.learning_timeout = QETH_VNICC_DEFAULT_TIMEOUT; + /* supported commands */ + card->options.vnicc.set_char_sup = QETH_VNICC_ALL; + card->options.vnicc.getset_timeout_sup = QETH_VNICC_LEARNING; + /* settings wanted by users */ + card->options.vnicc.wanted_chars = QETH_VNICC_DEFAULT; +} + +module_init(qeth_l2_init); +module_exit(qeth_l2_exit); +MODULE_AUTHOR("Frank Blaschka "); +MODULE_DESCRIPTION("qeth layer 2 discipline"); +MODULE_LICENSE("GPL"); diff --git a/drivers/s390/net/qeth_l2_sys.c b/drivers/s390/net/qeth_l2_sys.c new file mode 100644 index 000000000..f2c3b127b --- /dev/null +++ b/drivers/s390/net/qeth_l2_sys.c @@ -0,0 +1,451 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2013 + * Author(s): Eugene Crosser + */ + +#include +#include +#include "qeth_core.h" +#include "qeth_l2.h" + +static ssize_t qeth_bridge_port_role_state_show(struct device *dev, + struct device_attribute *attr, char *buf, + int show_state) +{ + struct qeth_card *card = dev_get_drvdata(dev); + enum qeth_sbp_states state = QETH_SBP_STATE_INACTIVE; + int rc = 0; + char *word; + + if (!card) + return -EINVAL; + + if (qeth_l2_vnicc_is_in_use(card)) + return sprintf(buf, "n/a (VNIC characteristics)\n"); + + if (qeth_card_hw_is_reachable(card) && + card->options.sbp.supported_funcs) + rc = qeth_bridgeport_query_ports(card, + &card->options.sbp.role, &state); + if (!rc) { + if (show_state) + switch (state) { + case QETH_SBP_STATE_INACTIVE: + word = "inactive"; break; + case QETH_SBP_STATE_STANDBY: + word = "standby"; break; + case QETH_SBP_STATE_ACTIVE: + word = "active"; break; + default: + rc = -EIO; + } + else + switch (card->options.sbp.role) { + case QETH_SBP_ROLE_NONE: + word = "none"; break; + case QETH_SBP_ROLE_PRIMARY: + word = "primary"; break; + case QETH_SBP_ROLE_SECONDARY: + word = "secondary"; break; + default: + rc = -EIO; + } + if (rc) + QETH_CARD_TEXT_(card, 2, "SBP%02x:%02x", + card->options.sbp.role, state); + else + rc = sprintf(buf, "%s\n", word); + } + + return rc; +} + +static ssize_t qeth_bridge_port_role_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (qeth_l2_vnicc_is_in_use(card)) + return sprintf(buf, "n/a (VNIC characteristics)\n"); + + return qeth_bridge_port_role_state_show(dev, attr, buf, 0); +} + +static ssize_t qeth_bridge_port_role_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + int rc = 0; + enum qeth_sbp_roles role; + + if (!card) + return -EINVAL; + if (sysfs_streq(buf, "primary")) + role = QETH_SBP_ROLE_PRIMARY; + else if (sysfs_streq(buf, "secondary")) + role = QETH_SBP_ROLE_SECONDARY; + else if (sysfs_streq(buf, "none")) + role = QETH_SBP_ROLE_NONE; + else + return -EINVAL; + + mutex_lock(&card->conf_mutex); + + if (qeth_l2_vnicc_is_in_use(card)) + rc = -EBUSY; + else if (card->options.sbp.reflect_promisc) + /* Forbid direct manipulation */ + rc = -EPERM; + else if (qeth_card_hw_is_reachable(card)) { + rc = qeth_bridgeport_setrole(card, role); + if (!rc) + card->options.sbp.role = role; + } else + card->options.sbp.role = role; + + mutex_unlock(&card->conf_mutex); + + return rc ? rc : count; +} + +static DEVICE_ATTR(bridge_role, 0644, qeth_bridge_port_role_show, + qeth_bridge_port_role_store); + +static ssize_t qeth_bridge_port_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (qeth_l2_vnicc_is_in_use(card)) + return sprintf(buf, "n/a (VNIC characteristics)\n"); + + return qeth_bridge_port_role_state_show(dev, attr, buf, 1); +} + +static DEVICE_ATTR(bridge_state, 0444, qeth_bridge_port_state_show, + NULL); + +static ssize_t qeth_bridgeport_hostnotification_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + int enabled; + + if (!card) + return -EINVAL; + + if (qeth_l2_vnicc_is_in_use(card)) + return sprintf(buf, "n/a (VNIC characteristics)\n"); + + enabled = card->options.sbp.hostnotification; + + return sprintf(buf, "%d\n", enabled); +} + +static ssize_t qeth_bridgeport_hostnotification_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + bool enable; + int rc; + + if (!card) + return -EINVAL; + + rc = kstrtobool(buf, &enable); + if (rc) + return rc; + + mutex_lock(&card->conf_mutex); + + if (qeth_l2_vnicc_is_in_use(card)) + rc = -EBUSY; + else if (qeth_card_hw_is_reachable(card)) { + rc = qeth_bridgeport_an_set(card, enable); + if (!rc) + card->options.sbp.hostnotification = enable; + } else + card->options.sbp.hostnotification = enable; + + mutex_unlock(&card->conf_mutex); + + return rc ? rc : count; +} + +static DEVICE_ATTR(bridge_hostnotify, 0644, + qeth_bridgeport_hostnotification_show, + qeth_bridgeport_hostnotification_store); + +static ssize_t qeth_bridgeport_reflect_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + char *state; + + if (!card) + return -EINVAL; + + if (qeth_l2_vnicc_is_in_use(card)) + return sprintf(buf, "n/a (VNIC characteristics)\n"); + + if (card->options.sbp.reflect_promisc) { + if (card->options.sbp.reflect_promisc_primary) + state = "primary"; + else + state = "secondary"; + } else + state = "none"; + + return sprintf(buf, "%s\n", state); +} + +static ssize_t qeth_bridgeport_reflect_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + int enable, primary; + int rc = 0; + + if (!card) + return -EINVAL; + + if (sysfs_streq(buf, "none")) { + enable = 0; + primary = 0; + } else if (sysfs_streq(buf, "primary")) { + enable = 1; + primary = 1; + } else if (sysfs_streq(buf, "secondary")) { + enable = 1; + primary = 0; + } else + return -EINVAL; + + mutex_lock(&card->conf_mutex); + + if (qeth_l2_vnicc_is_in_use(card)) + rc = -EBUSY; + else if (card->options.sbp.role != QETH_SBP_ROLE_NONE) + rc = -EPERM; + else { + card->options.sbp.reflect_promisc = enable; + card->options.sbp.reflect_promisc_primary = primary; + rc = 0; + } + + mutex_unlock(&card->conf_mutex); + + return rc ? rc : count; +} + +static DEVICE_ATTR(bridge_reflect_promisc, 0644, + qeth_bridgeport_reflect_show, + qeth_bridgeport_reflect_store); + +static struct attribute *qeth_l2_bridgeport_attrs[] = { + &dev_attr_bridge_role.attr, + &dev_attr_bridge_state.attr, + &dev_attr_bridge_hostnotify.attr, + &dev_attr_bridge_reflect_promisc.attr, + NULL, +}; + +static struct attribute_group qeth_l2_bridgeport_attr_group = { + .attrs = qeth_l2_bridgeport_attrs, +}; + +/** + * qeth_l2_setup_bridgeport_attrs() - set/restore attrs when turning online. + * @card: qeth_card structure pointer + * + * Note: this function is called with conf_mutex held by the caller + */ +void qeth_l2_setup_bridgeport_attrs(struct qeth_card *card) +{ + int rc; + + if (!card) + return; + if (!card->options.sbp.supported_funcs) + return; + if (card->options.sbp.role != QETH_SBP_ROLE_NONE) { + /* Conditional to avoid spurious error messages */ + qeth_bridgeport_setrole(card, card->options.sbp.role); + /* Let the callback function refresh the stored role value. */ + qeth_bridgeport_query_ports(card, + &card->options.sbp.role, NULL); + } + if (card->options.sbp.hostnotification) { + rc = qeth_bridgeport_an_set(card, 1); + if (rc) + card->options.sbp.hostnotification = 0; + } else + qeth_bridgeport_an_set(card, 0); +} + +/* VNIC CHARS support */ + +/* convert sysfs attr name to VNIC characteristic */ +static u32 qeth_l2_vnicc_sysfs_attr_to_char(const char *attr_name) +{ + if (sysfs_streq(attr_name, "flooding")) + return QETH_VNICC_FLOODING; + else if (sysfs_streq(attr_name, "mcast_flooding")) + return QETH_VNICC_MCAST_FLOODING; + else if (sysfs_streq(attr_name, "learning")) + return QETH_VNICC_LEARNING; + else if (sysfs_streq(attr_name, "takeover_setvmac")) + return QETH_VNICC_TAKEOVER_SETVMAC; + else if (sysfs_streq(attr_name, "takeover_learning")) + return QETH_VNICC_TAKEOVER_LEARNING; + else if (sysfs_streq(attr_name, "bridge_invisible")) + return QETH_VNICC_BRIDGE_INVISIBLE; + else if (sysfs_streq(attr_name, "rx_bcast")) + return QETH_VNICC_RX_BCAST; + + return 0; +} + +/* get current timeout setting */ +static ssize_t qeth_vnicc_timeout_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + u32 timeout; + int rc; + + if (!card) + return -EINVAL; + + rc = qeth_l2_vnicc_get_timeout(card, &timeout); + if (rc == -EBUSY) + return sprintf(buf, "n/a (BridgePort)\n"); + if (rc == -EOPNOTSUPP) + return sprintf(buf, "n/a\n"); + return rc ? rc : sprintf(buf, "%d\n", timeout); +} + +/* change timeout setting */ +static ssize_t qeth_vnicc_timeout_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + u32 timeout; + int rc; + + if (!card) + return -EINVAL; + + rc = kstrtou32(buf, 10, &timeout); + if (rc) + return rc; + + mutex_lock(&card->conf_mutex); + rc = qeth_l2_vnicc_set_timeout(card, timeout); + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +/* get current setting of characteristic */ +static ssize_t qeth_vnicc_char_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + bool state; + u32 vnicc; + int rc; + + if (!card) + return -EINVAL; + + vnicc = qeth_l2_vnicc_sysfs_attr_to_char(attr->attr.name); + rc = qeth_l2_vnicc_get_state(card, vnicc, &state); + + if (rc == -EBUSY) + return sprintf(buf, "n/a (BridgePort)\n"); + if (rc == -EOPNOTSUPP) + return sprintf(buf, "n/a\n"); + return rc ? rc : sprintf(buf, "%d\n", state); +} + +/* change setting of characteristic */ +static ssize_t qeth_vnicc_char_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + bool state; + u32 vnicc; + int rc; + + if (!card) + return -EINVAL; + + if (kstrtobool(buf, &state)) + return -EINVAL; + + vnicc = qeth_l2_vnicc_sysfs_attr_to_char(attr->attr.name); + mutex_lock(&card->conf_mutex); + rc = qeth_l2_vnicc_set_state(card, vnicc, state); + mutex_unlock(&card->conf_mutex); + + return rc ? rc : count; +} + +static DEVICE_ATTR(flooding, 0644, qeth_vnicc_char_show, qeth_vnicc_char_store); +static DEVICE_ATTR(mcast_flooding, 0644, qeth_vnicc_char_show, + qeth_vnicc_char_store); +static DEVICE_ATTR(learning, 0644, qeth_vnicc_char_show, qeth_vnicc_char_store); +static DEVICE_ATTR(learning_timeout, 0644, qeth_vnicc_timeout_show, + qeth_vnicc_timeout_store); +static DEVICE_ATTR(takeover_setvmac, 0644, qeth_vnicc_char_show, + qeth_vnicc_char_store); +static DEVICE_ATTR(takeover_learning, 0644, qeth_vnicc_char_show, + qeth_vnicc_char_store); +static DEVICE_ATTR(bridge_invisible, 0644, qeth_vnicc_char_show, + qeth_vnicc_char_store); +static DEVICE_ATTR(rx_bcast, 0644, qeth_vnicc_char_show, qeth_vnicc_char_store); + +static struct attribute *qeth_l2_vnicc_attrs[] = { + &dev_attr_flooding.attr, + &dev_attr_mcast_flooding.attr, + &dev_attr_learning.attr, + &dev_attr_learning_timeout.attr, + &dev_attr_takeover_setvmac.attr, + &dev_attr_takeover_learning.attr, + &dev_attr_bridge_invisible.attr, + &dev_attr_rx_bcast.attr, + NULL, +}; + +static struct attribute_group qeth_l2_vnicc_attr_group = { + .attrs = qeth_l2_vnicc_attrs, + .name = "vnicc", +}; + +static const struct attribute_group *qeth_l2_only_attr_groups[] = { + &qeth_l2_bridgeport_attr_group, + &qeth_l2_vnicc_attr_group, + NULL, +}; + +int qeth_l2_create_device_attributes(struct device *dev) +{ + return sysfs_create_groups(&dev->kobj, qeth_l2_only_attr_groups); +} + +void qeth_l2_remove_device_attributes(struct device *dev) +{ + sysfs_remove_groups(&dev->kobj, qeth_l2_only_attr_groups); +} + +const struct attribute_group *qeth_l2_attr_groups[] = { + &qeth_device_attr_group, + &qeth_device_blkt_group, + /* l2 specific, see qeth_l2_only_attr_groups: */ + &qeth_l2_bridgeport_attr_group, + &qeth_l2_vnicc_attr_group, + NULL, +}; diff --git a/drivers/s390/net/qeth_l3.h b/drivers/s390/net/qeth_l3.h new file mode 100644 index 000000000..87659cfc9 --- /dev/null +++ b/drivers/s390/net/qeth_l3.h @@ -0,0 +1,133 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2007 + * Author(s): Utz Bacher , + * Frank Pavlic , + * Thomas Spatzier , + * Frank Blaschka + */ + +#ifndef __QETH_L3_H__ +#define __QETH_L3_H__ + +#include "qeth_core.h" +#include + +#define QETH_SNIFF_AVAIL 0x0008 + +enum qeth_ip_types { + QETH_IP_TYPE_NORMAL, + QETH_IP_TYPE_VIPA, + QETH_IP_TYPE_RXIP, +}; + +struct qeth_ipaddr { + struct hlist_node hnode; + enum qeth_ip_types type; + unsigned char mac[ETH_ALEN]; + u8 is_multicast:1; + u8 in_progress:1; + u8 disp_flag:2; + u8 ipato:1; /* ucast only */ + + /* is changed only for normal ip addresses + * for non-normal addresses it always is 1 + */ + int ref_counter; + enum qeth_prot_versions proto; + union { + struct { + unsigned int addr; + unsigned int mask; + } a4; + struct { + struct in6_addr addr; + unsigned int pfxlen; + } a6; + } u; +}; + +static inline void qeth_l3_init_ipaddr(struct qeth_ipaddr *addr, + enum qeth_ip_types type, + enum qeth_prot_versions proto) +{ + memset(addr, 0, sizeof(*addr)); + addr->type = type; + addr->proto = proto; + addr->disp_flag = QETH_DISP_ADDR_DO_NOTHING; +} + +static inline bool qeth_l3_addr_match_ip(struct qeth_ipaddr *a1, + struct qeth_ipaddr *a2) +{ + if (a1->proto != a2->proto) + return false; + if (a1->proto == QETH_PROT_IPV6) + return ipv6_addr_equal(&a1->u.a6.addr, &a2->u.a6.addr); + return a1->u.a4.addr == a2->u.a4.addr; +} + +static inline bool qeth_l3_addr_match_all(struct qeth_ipaddr *a1, + struct qeth_ipaddr *a2) +{ + /* Assumes that the pair was obtained via qeth_l3_addr_find_by_ip(), + * so 'proto' and 'addr' match for sure. + * + * For ucast: + * - 'mac' is always 0. + * - 'mask'/'pfxlen' for RXIP/VIPA is always 0. For NORMAL, matching + * values are required to avoid mixups in takeover eligibility. + * + * For mcast, + * - 'mac' is mapped from the IP, and thus always matches. + * - 'mask'/'pfxlen' is always 0. + */ + if (a1->type != a2->type) + return false; + if (a1->proto == QETH_PROT_IPV6) + return a1->u.a6.pfxlen == a2->u.a6.pfxlen; + return a1->u.a4.mask == a2->u.a4.mask; +} + +static inline u64 qeth_l3_ipaddr_hash(struct qeth_ipaddr *addr) +{ + u64 ret = 0; + u8 *point; + + if (addr->proto == QETH_PROT_IPV6) { + point = (u8 *) &addr->u.a6.addr; + ret = get_unaligned((u64 *)point) ^ + get_unaligned((u64 *) (point + 8)); + } + if (addr->proto == QETH_PROT_IPV4) { + point = (u8 *) &addr->u.a4.addr; + ret = get_unaligned((u32 *) point); + } + return ret; +} + +struct qeth_ipato_entry { + struct list_head entry; + enum qeth_prot_versions proto; + char addr[16]; + int mask_bits; +}; + +extern const struct attribute_group *qeth_l3_attr_groups[]; + +void qeth_l3_ipaddr_to_string(enum qeth_prot_versions, const __u8 *, char *); +int qeth_l3_create_device_attributes(struct device *); +void qeth_l3_remove_device_attributes(struct device *); +int qeth_l3_setrouting_v4(struct qeth_card *); +int qeth_l3_setrouting_v6(struct qeth_card *); +int qeth_l3_add_ipato_entry(struct qeth_card *, struct qeth_ipato_entry *); +int qeth_l3_del_ipato_entry(struct qeth_card *card, + enum qeth_prot_versions proto, u8 *addr, + int mask_bits); +void qeth_l3_update_ipato(struct qeth_card *card); +int qeth_l3_modify_hsuid(struct qeth_card *card, bool add); +int qeth_l3_modify_rxip_vipa(struct qeth_card *card, bool add, const u8 *ip, + enum qeth_ip_types type, + enum qeth_prot_versions proto); + +#endif /* __QETH_L3_H__ */ diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c new file mode 100644 index 000000000..52e0ae4dc --- /dev/null +++ b/drivers/s390/net/qeth_l3_main.c @@ -0,0 +1,3000 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2007, 2009 + * Author(s): Utz Bacher , + * Frank Pavlic , + * Thomas Spatzier , + * Frank Blaschka + */ + +#define KMSG_COMPONENT "qeth" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "qeth_l3.h" + + +static int qeth_l3_set_offline(struct ccwgroup_device *); +static int qeth_l3_stop(struct net_device *); +static void qeth_l3_set_rx_mode(struct net_device *dev); +static int qeth_l3_register_addr_entry(struct qeth_card *, + struct qeth_ipaddr *); +static int qeth_l3_deregister_addr_entry(struct qeth_card *, + struct qeth_ipaddr *); + +static void qeth_l3_ipaddr4_to_string(const __u8 *addr, char *buf) +{ + sprintf(buf, "%pI4", addr); +} + +static void qeth_l3_ipaddr6_to_string(const __u8 *addr, char *buf) +{ + sprintf(buf, "%pI6", addr); +} + +void qeth_l3_ipaddr_to_string(enum qeth_prot_versions proto, const __u8 *addr, + char *buf) +{ + if (proto == QETH_PROT_IPV4) + qeth_l3_ipaddr4_to_string(addr, buf); + else if (proto == QETH_PROT_IPV6) + qeth_l3_ipaddr6_to_string(addr, buf); +} + +static struct qeth_ipaddr *qeth_l3_get_addr_buffer(enum qeth_prot_versions prot) +{ + struct qeth_ipaddr *addr = kmalloc(sizeof(*addr), GFP_ATOMIC); + + if (addr) + qeth_l3_init_ipaddr(addr, QETH_IP_TYPE_NORMAL, prot); + return addr; +} + +static struct qeth_ipaddr *qeth_l3_find_addr_by_ip(struct qeth_card *card, + struct qeth_ipaddr *query) +{ + u64 key = qeth_l3_ipaddr_hash(query); + struct qeth_ipaddr *addr; + + if (query->is_multicast) { + hash_for_each_possible(card->ip_mc_htable, addr, hnode, key) + if (qeth_l3_addr_match_ip(addr, query)) + return addr; + } else { + hash_for_each_possible(card->ip_htable, addr, hnode, key) + if (qeth_l3_addr_match_ip(addr, query)) + return addr; + } + return NULL; +} + +static void qeth_l3_convert_addr_to_bits(u8 *addr, u8 *bits, int len) +{ + int i, j; + u8 octet; + + for (i = 0; i < len; ++i) { + octet = addr[i]; + for (j = 7; j >= 0; --j) { + bits[i*8 + j] = octet & 1; + octet >>= 1; + } + } +} + +static bool qeth_l3_is_addr_covered_by_ipato(struct qeth_card *card, + struct qeth_ipaddr *addr) +{ + struct qeth_ipato_entry *ipatoe; + u8 addr_bits[128] = {0, }; + u8 ipatoe_bits[128] = {0, }; + int rc = 0; + + if (!card->ipato.enabled) + return false; + if (addr->type != QETH_IP_TYPE_NORMAL) + return false; + + qeth_l3_convert_addr_to_bits((u8 *) &addr->u, addr_bits, + (addr->proto == QETH_PROT_IPV4)? 4:16); + list_for_each_entry(ipatoe, &card->ipato.entries, entry) { + if (addr->proto != ipatoe->proto) + continue; + qeth_l3_convert_addr_to_bits(ipatoe->addr, ipatoe_bits, + (ipatoe->proto == QETH_PROT_IPV4) ? + 4 : 16); + if (addr->proto == QETH_PROT_IPV4) + rc = !memcmp(addr_bits, ipatoe_bits, + min(32, ipatoe->mask_bits)); + else + rc = !memcmp(addr_bits, ipatoe_bits, + min(128, ipatoe->mask_bits)); + if (rc) + break; + } + /* invert? */ + if ((addr->proto == QETH_PROT_IPV4) && card->ipato.invert4) + rc = !rc; + else if ((addr->proto == QETH_PROT_IPV6) && card->ipato.invert6) + rc = !rc; + + return rc; +} + +static int qeth_l3_delete_ip(struct qeth_card *card, + struct qeth_ipaddr *tmp_addr) +{ + int rc = 0; + struct qeth_ipaddr *addr; + + if (tmp_addr->type == QETH_IP_TYPE_RXIP) + QETH_CARD_TEXT(card, 2, "delrxip"); + else if (tmp_addr->type == QETH_IP_TYPE_VIPA) + QETH_CARD_TEXT(card, 2, "delvipa"); + else + QETH_CARD_TEXT(card, 2, "delip"); + + if (tmp_addr->proto == QETH_PROT_IPV4) + QETH_CARD_HEX(card, 4, &tmp_addr->u.a4.addr, 4); + else { + QETH_CARD_HEX(card, 4, &tmp_addr->u.a6.addr, 8); + QETH_CARD_HEX(card, 4, ((char *)&tmp_addr->u.a6.addr) + 8, 8); + } + + addr = qeth_l3_find_addr_by_ip(card, tmp_addr); + if (!addr || !qeth_l3_addr_match_all(addr, tmp_addr)) + return -ENOENT; + + addr->ref_counter--; + if (addr->type == QETH_IP_TYPE_NORMAL && addr->ref_counter > 0) + return rc; + if (addr->in_progress) + return -EINPROGRESS; + + if (qeth_card_hw_is_reachable(card)) + rc = qeth_l3_deregister_addr_entry(card, addr); + + hash_del(&addr->hnode); + kfree(addr); + + return rc; +} + +static int qeth_l3_add_ip(struct qeth_card *card, struct qeth_ipaddr *tmp_addr) +{ + int rc = 0; + struct qeth_ipaddr *addr; + char buf[40]; + + if (tmp_addr->type == QETH_IP_TYPE_RXIP) + QETH_CARD_TEXT(card, 2, "addrxip"); + else if (tmp_addr->type == QETH_IP_TYPE_VIPA) + QETH_CARD_TEXT(card, 2, "addvipa"); + else + QETH_CARD_TEXT(card, 2, "addip"); + + if (tmp_addr->proto == QETH_PROT_IPV4) + QETH_CARD_HEX(card, 4, &tmp_addr->u.a4.addr, 4); + else { + QETH_CARD_HEX(card, 4, &tmp_addr->u.a6.addr, 8); + QETH_CARD_HEX(card, 4, ((char *)&tmp_addr->u.a6.addr) + 8, 8); + } + + addr = qeth_l3_find_addr_by_ip(card, tmp_addr); + if (addr) { + if (tmp_addr->type != QETH_IP_TYPE_NORMAL) + return -EADDRINUSE; + if (qeth_l3_addr_match_all(addr, tmp_addr)) { + addr->ref_counter++; + return 0; + } + qeth_l3_ipaddr_to_string(tmp_addr->proto, (u8 *)&tmp_addr->u, + buf); + dev_warn(&card->gdev->dev, + "Registering IP address %s failed\n", buf); + return -EADDRINUSE; + } else { + addr = qeth_l3_get_addr_buffer(tmp_addr->proto); + if (!addr) + return -ENOMEM; + + memcpy(addr, tmp_addr, sizeof(struct qeth_ipaddr)); + addr->ref_counter = 1; + + if (qeth_l3_is_addr_covered_by_ipato(card, addr)) { + QETH_CARD_TEXT(card, 2, "tkovaddr"); + addr->ipato = 1; + } + hash_add(card->ip_htable, &addr->hnode, + qeth_l3_ipaddr_hash(addr)); + + if (!qeth_card_hw_is_reachable(card)) { + addr->disp_flag = QETH_DISP_ADDR_ADD; + return 0; + } + + /* qeth_l3_register_addr_entry can go to sleep + * if we add a IPV4 addr. It is caused by the reason + * that SETIP ipa cmd starts ARP staff for IPV4 addr. + * Thus we should unlock spinlock, and make a protection + * using in_progress variable to indicate that there is + * an hardware operation with this IPV4 address + */ + if (addr->proto == QETH_PROT_IPV4) { + addr->in_progress = 1; + spin_unlock_bh(&card->ip_lock); + rc = qeth_l3_register_addr_entry(card, addr); + spin_lock_bh(&card->ip_lock); + addr->in_progress = 0; + } else + rc = qeth_l3_register_addr_entry(card, addr); + + if (!rc || (rc == IPA_RC_DUPLICATE_IP_ADDRESS) || + (rc == IPA_RC_LAN_OFFLINE)) { + addr->disp_flag = QETH_DISP_ADDR_DO_NOTHING; + if (addr->ref_counter < 1) { + qeth_l3_deregister_addr_entry(card, addr); + hash_del(&addr->hnode); + kfree(addr); + } + } else { + hash_del(&addr->hnode); + kfree(addr); + } + } + return rc; +} + +static void qeth_l3_clear_ip_htable(struct qeth_card *card, int recover) +{ + struct qeth_ipaddr *addr; + struct hlist_node *tmp; + int i; + + QETH_CARD_TEXT(card, 4, "clearip"); + + spin_lock_bh(&card->ip_lock); + + hash_for_each_safe(card->ip_htable, i, tmp, addr, hnode) { + if (!recover) { + hash_del(&addr->hnode); + kfree(addr); + continue; + } + addr->disp_flag = QETH_DISP_ADDR_ADD; + } + + spin_unlock_bh(&card->ip_lock); + + spin_lock_bh(&card->mclock); + + hash_for_each_safe(card->ip_mc_htable, i, tmp, addr, hnode) { + hash_del(&addr->hnode); + kfree(addr); + } + + spin_unlock_bh(&card->mclock); + + +} +static void qeth_l3_recover_ip(struct qeth_card *card) +{ + struct qeth_ipaddr *addr; + struct hlist_node *tmp; + int i; + int rc; + + QETH_CARD_TEXT(card, 4, "recovrip"); + + spin_lock_bh(&card->ip_lock); + + hash_for_each_safe(card->ip_htable, i, tmp, addr, hnode) { + if (addr->disp_flag == QETH_DISP_ADDR_ADD) { + if (addr->proto == QETH_PROT_IPV4) { + addr->in_progress = 1; + spin_unlock_bh(&card->ip_lock); + rc = qeth_l3_register_addr_entry(card, addr); + spin_lock_bh(&card->ip_lock); + addr->in_progress = 0; + } else + rc = qeth_l3_register_addr_entry(card, addr); + + if (!rc) { + addr->disp_flag = QETH_DISP_ADDR_DO_NOTHING; + if (addr->ref_counter < 1) + qeth_l3_delete_ip(card, addr); + } else { + hash_del(&addr->hnode); + kfree(addr); + } + } + } + + spin_unlock_bh(&card->ip_lock); + +} + +static int qeth_l3_send_setdelmc(struct qeth_card *card, + struct qeth_ipaddr *addr, int ipacmd) +{ + int rc; + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + QETH_CARD_TEXT(card, 4, "setdelmc"); + + iob = qeth_get_ipacmd_buffer(card, ipacmd, addr->proto); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + ether_addr_copy(cmd->data.setdelipm.mac, addr->mac); + if (addr->proto == QETH_PROT_IPV6) + memcpy(cmd->data.setdelipm.ip6, &addr->u.a6.addr, + sizeof(struct in6_addr)); + else + memcpy(&cmd->data.setdelipm.ip4, &addr->u.a4.addr, 4); + + rc = qeth_send_ipa_cmd(card, iob, NULL, NULL); + + return rc; +} + +static void qeth_l3_fill_netmask(u8 *netmask, unsigned int len) +{ + int i, j; + for (i = 0; i < 16; i++) { + j = (len) - (i * 8); + if (j >= 8) + netmask[i] = 0xff; + else if (j > 0) + netmask[i] = (u8)(0xFF00 >> j); + else + netmask[i] = 0; + } +} + +static u32 qeth_l3_get_setdelip_flags(struct qeth_ipaddr *addr, bool set) +{ + switch (addr->type) { + case QETH_IP_TYPE_RXIP: + return (set) ? QETH_IPA_SETIP_TAKEOVER_FLAG : 0; + case QETH_IP_TYPE_VIPA: + return (set) ? QETH_IPA_SETIP_VIPA_FLAG : + QETH_IPA_DELIP_VIPA_FLAG; + default: + return (set && addr->ipato) ? QETH_IPA_SETIP_TAKEOVER_FLAG : 0; + } +} + +static int qeth_l3_send_setdelip(struct qeth_card *card, + struct qeth_ipaddr *addr, + enum qeth_ipa_cmds ipacmd) +{ + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + __u8 netmask[16]; + u32 flags; + + QETH_CARD_TEXT(card, 4, "setdelip"); + + iob = qeth_get_ipacmd_buffer(card, ipacmd, addr->proto); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + + flags = qeth_l3_get_setdelip_flags(addr, ipacmd == IPA_CMD_SETIP); + QETH_CARD_TEXT_(card, 4, "flags%02X", flags); + + if (addr->proto == QETH_PROT_IPV6) { + memcpy(cmd->data.setdelip6.ip_addr, &addr->u.a6.addr, + sizeof(struct in6_addr)); + qeth_l3_fill_netmask(netmask, addr->u.a6.pfxlen); + memcpy(cmd->data.setdelip6.mask, netmask, + sizeof(struct in6_addr)); + cmd->data.setdelip6.flags = flags; + } else { + memcpy(cmd->data.setdelip4.ip_addr, &addr->u.a4.addr, 4); + memcpy(cmd->data.setdelip4.mask, &addr->u.a4.mask, 4); + cmd->data.setdelip4.flags = flags; + } + + return qeth_send_ipa_cmd(card, iob, NULL, NULL); +} + +static int qeth_l3_send_setrouting(struct qeth_card *card, + enum qeth_routing_types type, enum qeth_prot_versions prot) +{ + int rc; + struct qeth_ipa_cmd *cmd; + struct qeth_cmd_buffer *iob; + + QETH_CARD_TEXT(card, 4, "setroutg"); + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_SETRTG, prot); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + cmd->data.setrtg.type = (type); + rc = qeth_send_ipa_cmd(card, iob, NULL, NULL); + + return rc; +} + +static int qeth_l3_correct_routing_type(struct qeth_card *card, + enum qeth_routing_types *type, enum qeth_prot_versions prot) +{ + if (card->info.type == QETH_CARD_TYPE_IQD) { + switch (*type) { + case NO_ROUTER: + case PRIMARY_CONNECTOR: + case SECONDARY_CONNECTOR: + case MULTICAST_ROUTER: + return 0; + default: + goto out_inval; + } + } else { + switch (*type) { + case NO_ROUTER: + case PRIMARY_ROUTER: + case SECONDARY_ROUTER: + return 0; + case MULTICAST_ROUTER: + if (qeth_is_ipafunc_supported(card, prot, + IPA_OSA_MC_ROUTER)) + return 0; + default: + goto out_inval; + } + } +out_inval: + *type = NO_ROUTER; + return -EINVAL; +} + +int qeth_l3_setrouting_v4(struct qeth_card *card) +{ + int rc; + + QETH_CARD_TEXT(card, 3, "setrtg4"); + + rc = qeth_l3_correct_routing_type(card, &card->options.route4.type, + QETH_PROT_IPV4); + if (rc) + return rc; + + rc = qeth_l3_send_setrouting(card, card->options.route4.type, + QETH_PROT_IPV4); + if (rc) { + card->options.route4.type = NO_ROUTER; + QETH_DBF_MESSAGE(2, "Error (0x%04x) while setting routing type" + " on %s. Type set to 'no router'.\n", rc, + QETH_CARD_IFNAME(card)); + } + return rc; +} + +int qeth_l3_setrouting_v6(struct qeth_card *card) +{ + int rc = 0; + + QETH_CARD_TEXT(card, 3, "setrtg6"); + + if (!qeth_is_supported(card, IPA_IPV6)) + return 0; + rc = qeth_l3_correct_routing_type(card, &card->options.route6.type, + QETH_PROT_IPV6); + if (rc) + return rc; + + rc = qeth_l3_send_setrouting(card, card->options.route6.type, + QETH_PROT_IPV6); + if (rc) { + card->options.route6.type = NO_ROUTER; + QETH_DBF_MESSAGE(2, "Error (0x%04x) while setting routing type" + " on %s. Type set to 'no router'.\n", rc, + QETH_CARD_IFNAME(card)); + } + return rc; +} + +/* + * IP address takeover related functions + */ + +/** + * qeth_l3_update_ipato() - Update 'takeover' property, for all NORMAL IPs. + * + * Caller must hold ip_lock. + */ +void qeth_l3_update_ipato(struct qeth_card *card) +{ + struct qeth_ipaddr *addr; + unsigned int i; + + hash_for_each(card->ip_htable, i, addr, hnode) { + if (addr->type != QETH_IP_TYPE_NORMAL) + continue; + addr->ipato = qeth_l3_is_addr_covered_by_ipato(card, addr); + } +} + +static void qeth_l3_clear_ipato_list(struct qeth_card *card) +{ + struct qeth_ipato_entry *ipatoe, *tmp; + + spin_lock_bh(&card->ip_lock); + + list_for_each_entry_safe(ipatoe, tmp, &card->ipato.entries, entry) { + list_del(&ipatoe->entry); + kfree(ipatoe); + } + + qeth_l3_update_ipato(card); + spin_unlock_bh(&card->ip_lock); +} + +int qeth_l3_add_ipato_entry(struct qeth_card *card, + struct qeth_ipato_entry *new) +{ + struct qeth_ipato_entry *ipatoe; + int rc = 0; + + QETH_CARD_TEXT(card, 2, "addipato"); + + spin_lock_bh(&card->ip_lock); + + list_for_each_entry(ipatoe, &card->ipato.entries, entry) { + if (ipatoe->proto != new->proto) + continue; + if (!memcmp(ipatoe->addr, new->addr, + (ipatoe->proto == QETH_PROT_IPV4)? 4:16) && + (ipatoe->mask_bits == new->mask_bits)) { + rc = -EEXIST; + break; + } + } + + if (!rc) { + list_add_tail(&new->entry, &card->ipato.entries); + qeth_l3_update_ipato(card); + } + + spin_unlock_bh(&card->ip_lock); + + return rc; +} + +int qeth_l3_del_ipato_entry(struct qeth_card *card, + enum qeth_prot_versions proto, u8 *addr, + int mask_bits) +{ + struct qeth_ipato_entry *ipatoe, *tmp; + int rc = -ENOENT; + + QETH_CARD_TEXT(card, 2, "delipato"); + + spin_lock_bh(&card->ip_lock); + + list_for_each_entry_safe(ipatoe, tmp, &card->ipato.entries, entry) { + if (ipatoe->proto != proto) + continue; + if (!memcmp(ipatoe->addr, addr, + (proto == QETH_PROT_IPV4)? 4:16) && + (ipatoe->mask_bits == mask_bits)) { + list_del(&ipatoe->entry); + qeth_l3_update_ipato(card); + kfree(ipatoe); + rc = 0; + } + } + + spin_unlock_bh(&card->ip_lock); + return rc; +} + +int qeth_l3_modify_rxip_vipa(struct qeth_card *card, bool add, const u8 *ip, + enum qeth_ip_types type, + enum qeth_prot_versions proto) +{ + struct qeth_ipaddr addr; + int rc; + + qeth_l3_init_ipaddr(&addr, type, proto); + if (proto == QETH_PROT_IPV4) + memcpy(&addr.u.a4.addr, ip, 4); + else + memcpy(&addr.u.a6.addr, ip, 16); + + spin_lock_bh(&card->ip_lock); + rc = add ? qeth_l3_add_ip(card, &addr) : qeth_l3_delete_ip(card, &addr); + spin_unlock_bh(&card->ip_lock); + return rc; +} + +int qeth_l3_modify_hsuid(struct qeth_card *card, bool add) +{ + struct qeth_ipaddr addr; + int rc, i; + + qeth_l3_init_ipaddr(&addr, QETH_IP_TYPE_NORMAL, QETH_PROT_IPV6); + addr.u.a6.addr.s6_addr[0] = 0xfe; + addr.u.a6.addr.s6_addr[1] = 0x80; + for (i = 0; i < 8; i++) + addr.u.a6.addr.s6_addr[8+i] = card->options.hsuid[i]; + + spin_lock_bh(&card->ip_lock); + rc = add ? qeth_l3_add_ip(card, &addr) : qeth_l3_delete_ip(card, &addr); + spin_unlock_bh(&card->ip_lock); + return rc; +} + +static int qeth_l3_register_addr_entry(struct qeth_card *card, + struct qeth_ipaddr *addr) +{ + char buf[50]; + int rc = 0; + int cnt = 3; + + if (card->options.sniffer) + return 0; + + if (addr->proto == QETH_PROT_IPV4) { + QETH_CARD_TEXT(card, 2, "setaddr4"); + QETH_CARD_HEX(card, 3, &addr->u.a4.addr, sizeof(int)); + } else if (addr->proto == QETH_PROT_IPV6) { + QETH_CARD_TEXT(card, 2, "setaddr6"); + QETH_CARD_HEX(card, 3, &addr->u.a6.addr, 8); + QETH_CARD_HEX(card, 3, ((char *)&addr->u.a6.addr) + 8, 8); + } else { + QETH_CARD_TEXT(card, 2, "setaddr?"); + QETH_CARD_HEX(card, 3, addr, sizeof(struct qeth_ipaddr)); + } + do { + if (addr->is_multicast) + rc = qeth_l3_send_setdelmc(card, addr, IPA_CMD_SETIPM); + else + rc = qeth_l3_send_setdelip(card, addr, IPA_CMD_SETIP); + if (rc) + QETH_CARD_TEXT(card, 2, "failed"); + } while ((--cnt > 0) && rc); + if (rc) { + QETH_CARD_TEXT(card, 2, "FAILED"); + qeth_l3_ipaddr_to_string(addr->proto, (u8 *)&addr->u, buf); + dev_warn(&card->gdev->dev, + "Registering IP address %s failed\n", buf); + } + return rc; +} + +static int qeth_l3_deregister_addr_entry(struct qeth_card *card, + struct qeth_ipaddr *addr) +{ + int rc = 0; + + if (card->options.sniffer) + return 0; + + if (addr->proto == QETH_PROT_IPV4) { + QETH_CARD_TEXT(card, 2, "deladdr4"); + QETH_CARD_HEX(card, 3, &addr->u.a4.addr, sizeof(int)); + } else if (addr->proto == QETH_PROT_IPV6) { + QETH_CARD_TEXT(card, 2, "deladdr6"); + QETH_CARD_HEX(card, 3, &addr->u.a6.addr, 8); + QETH_CARD_HEX(card, 3, ((char *)&addr->u.a6.addr) + 8, 8); + } else { + QETH_CARD_TEXT(card, 2, "deladdr?"); + QETH_CARD_HEX(card, 3, addr, sizeof(struct qeth_ipaddr)); + } + if (addr->is_multicast) + rc = qeth_l3_send_setdelmc(card, addr, IPA_CMD_DELIPM); + else + rc = qeth_l3_send_setdelip(card, addr, IPA_CMD_DELIP); + if (rc) + QETH_CARD_TEXT(card, 2, "failed"); + + return rc; +} + +static int qeth_l3_setadapter_parms(struct qeth_card *card) +{ + int rc = 0; + + QETH_DBF_TEXT(SETUP, 2, "setadprm"); + + if (qeth_adp_supported(card, IPA_SETADP_ALTER_MAC_ADDRESS)) { + rc = qeth_setadpparms_change_macaddr(card); + if (rc) + dev_warn(&card->gdev->dev, "Reading the adapter MAC" + " address failed\n"); + } + + return rc; +} + +static int qeth_l3_start_ipa_arp_processing(struct qeth_card *card) +{ + int rc; + + QETH_CARD_TEXT(card, 3, "ipaarp"); + + if (!qeth_is_supported(card, IPA_ARP_PROCESSING)) { + dev_info(&card->gdev->dev, + "ARP processing not supported on %s!\n", + QETH_CARD_IFNAME(card)); + return 0; + } + rc = qeth_send_simple_setassparms(card, IPA_ARP_PROCESSING, + IPA_CMD_ASS_START, 0); + if (rc) { + dev_warn(&card->gdev->dev, + "Starting ARP processing support for %s failed\n", + QETH_CARD_IFNAME(card)); + } + return rc; +} + +static int qeth_l3_start_ipa_source_mac(struct qeth_card *card) +{ + int rc; + + QETH_CARD_TEXT(card, 3, "stsrcmac"); + + if (!qeth_is_supported(card, IPA_SOURCE_MAC)) { + dev_info(&card->gdev->dev, + "Inbound source MAC-address not supported on %s\n", + QETH_CARD_IFNAME(card)); + return -EOPNOTSUPP; + } + + rc = qeth_send_simple_setassparms(card, IPA_SOURCE_MAC, + IPA_CMD_ASS_START, 0); + if (rc) + dev_warn(&card->gdev->dev, + "Starting source MAC-address support for %s failed\n", + QETH_CARD_IFNAME(card)); + return rc; +} + +static int qeth_l3_start_ipa_vlan(struct qeth_card *card) +{ + int rc = 0; + + QETH_CARD_TEXT(card, 3, "strtvlan"); + + if (!qeth_is_supported(card, IPA_FULL_VLAN)) { + dev_info(&card->gdev->dev, + "VLAN not supported on %s\n", QETH_CARD_IFNAME(card)); + return -EOPNOTSUPP; + } + + rc = qeth_send_simple_setassparms(card, IPA_VLAN_PRIO, + IPA_CMD_ASS_START, 0); + if (rc) { + dev_warn(&card->gdev->dev, + "Starting VLAN support for %s failed\n", + QETH_CARD_IFNAME(card)); + } else { + dev_info(&card->gdev->dev, "VLAN enabled\n"); + } + return rc; +} + +static int qeth_l3_start_ipa_multicast(struct qeth_card *card) +{ + int rc; + + QETH_CARD_TEXT(card, 3, "stmcast"); + + if (!qeth_is_supported(card, IPA_MULTICASTING)) { + dev_info(&card->gdev->dev, + "Multicast not supported on %s\n", + QETH_CARD_IFNAME(card)); + return -EOPNOTSUPP; + } + + rc = qeth_send_simple_setassparms(card, IPA_MULTICASTING, + IPA_CMD_ASS_START, 0); + if (rc) { + dev_warn(&card->gdev->dev, + "Starting multicast support for %s failed\n", + QETH_CARD_IFNAME(card)); + } else { + dev_info(&card->gdev->dev, "Multicast enabled\n"); + card->dev->flags |= IFF_MULTICAST; + } + return rc; +} + +static int qeth_l3_softsetup_ipv6(struct qeth_card *card) +{ + int rc; + + QETH_CARD_TEXT(card, 3, "softipv6"); + + if (card->info.type == QETH_CARD_TYPE_IQD) + goto out; + + rc = qeth_send_simple_setassparms(card, IPA_IPV6, + IPA_CMD_ASS_START, 3); + if (rc) { + dev_err(&card->gdev->dev, + "Activating IPv6 support for %s failed\n", + QETH_CARD_IFNAME(card)); + return rc; + } + rc = qeth_send_simple_setassparms_v6(card, IPA_IPV6, + IPA_CMD_ASS_START, 0); + if (rc) { + dev_err(&card->gdev->dev, + "Activating IPv6 support for %s failed\n", + QETH_CARD_IFNAME(card)); + return rc; + } + rc = qeth_send_simple_setassparms_v6(card, IPA_PASSTHRU, + IPA_CMD_ASS_START, 0); + if (rc) { + dev_warn(&card->gdev->dev, + "Enabling the passthrough mode for %s failed\n", + QETH_CARD_IFNAME(card)); + return rc; + } +out: + dev_info(&card->gdev->dev, "IPV6 enabled\n"); + return 0; +} + +static int qeth_l3_start_ipa_ipv6(struct qeth_card *card) +{ + QETH_CARD_TEXT(card, 3, "strtipv6"); + + if (!qeth_is_supported(card, IPA_IPV6)) { + dev_info(&card->gdev->dev, + "IPv6 not supported on %s\n", QETH_CARD_IFNAME(card)); + return 0; + } + return qeth_l3_softsetup_ipv6(card); +} + +static int qeth_l3_start_ipa_broadcast(struct qeth_card *card) +{ + int rc; + + QETH_CARD_TEXT(card, 3, "stbrdcst"); + card->info.broadcast_capable = 0; + if (!qeth_is_supported(card, IPA_FILTERING)) { + dev_info(&card->gdev->dev, + "Broadcast not supported on %s\n", + QETH_CARD_IFNAME(card)); + rc = -EOPNOTSUPP; + goto out; + } + rc = qeth_send_simple_setassparms(card, IPA_FILTERING, + IPA_CMD_ASS_START, 0); + if (rc) { + dev_warn(&card->gdev->dev, "Enabling broadcast filtering for " + "%s failed\n", QETH_CARD_IFNAME(card)); + goto out; + } + + rc = qeth_send_simple_setassparms(card, IPA_FILTERING, + IPA_CMD_ASS_CONFIGURE, 1); + if (rc) { + dev_warn(&card->gdev->dev, + "Setting up broadcast filtering for %s failed\n", + QETH_CARD_IFNAME(card)); + goto out; + } + card->info.broadcast_capable = QETH_BROADCAST_WITH_ECHO; + dev_info(&card->gdev->dev, "Broadcast enabled\n"); + rc = qeth_send_simple_setassparms(card, IPA_FILTERING, + IPA_CMD_ASS_ENABLE, 1); + if (rc) { + dev_warn(&card->gdev->dev, "Setting up broadcast echo " + "filtering for %s failed\n", QETH_CARD_IFNAME(card)); + goto out; + } + card->info.broadcast_capable = QETH_BROADCAST_WITHOUT_ECHO; +out: + if (card->info.broadcast_capable) + card->dev->flags |= IFF_BROADCAST; + else + card->dev->flags &= ~IFF_BROADCAST; + return rc; +} + +static int qeth_l3_start_ipassists(struct qeth_card *card) +{ + QETH_CARD_TEXT(card, 3, "strtipas"); + + if (qeth_set_access_ctrl_online(card, 0)) + return -EIO; + qeth_l3_start_ipa_arp_processing(card); /* go on*/ + qeth_l3_start_ipa_source_mac(card); /* go on*/ + qeth_l3_start_ipa_vlan(card); /* go on*/ + qeth_l3_start_ipa_multicast(card); /* go on*/ + qeth_l3_start_ipa_ipv6(card); /* go on*/ + qeth_l3_start_ipa_broadcast(card); /* go on*/ + return 0; +} + +static int qeth_l3_iqd_read_initial_mac_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd; + + cmd = (struct qeth_ipa_cmd *) data; + if (cmd->hdr.return_code == 0) + ether_addr_copy(card->dev->dev_addr, + cmd->data.create_destroy_addr.unique_id); + else + eth_random_addr(card->dev->dev_addr); + + return 0; +} + +static int qeth_l3_iqd_read_initial_mac(struct qeth_card *card) +{ + int rc = 0; + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + QETH_DBF_TEXT(SETUP, 2, "hsrmac"); + + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_CREATE_ADDR, + QETH_PROT_IPV6); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + *((__u16 *) &cmd->data.create_destroy_addr.unique_id[6]) = + card->info.unique_id; + + rc = qeth_send_ipa_cmd(card, iob, qeth_l3_iqd_read_initial_mac_cb, + NULL); + return rc; +} + +static int qeth_l3_get_unique_id_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd; + + cmd = (struct qeth_ipa_cmd *) data; + if (cmd->hdr.return_code == 0) + card->info.unique_id = *((__u16 *) + &cmd->data.create_destroy_addr.unique_id[6]); + else { + card->info.unique_id = UNIQUE_ID_IF_CREATE_ADDR_FAILED | + UNIQUE_ID_NOT_BY_CARD; + dev_warn(&card->gdev->dev, "The network adapter failed to " + "generate a unique ID\n"); + } + return 0; +} + +static int qeth_l3_get_unique_id(struct qeth_card *card) +{ + int rc = 0; + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + QETH_DBF_TEXT(SETUP, 2, "guniqeid"); + + if (!qeth_is_supported(card, IPA_IPV6)) { + card->info.unique_id = UNIQUE_ID_IF_CREATE_ADDR_FAILED | + UNIQUE_ID_NOT_BY_CARD; + return 0; + } + + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_CREATE_ADDR, + QETH_PROT_IPV6); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + *((__u16 *) &cmd->data.create_destroy_addr.unique_id[6]) = + card->info.unique_id; + + rc = qeth_send_ipa_cmd(card, iob, qeth_l3_get_unique_id_cb, NULL); + return rc; +} + +static int +qeth_diags_trace_cb(struct qeth_card *card, struct qeth_reply *reply, + unsigned long data) +{ + struct qeth_ipa_cmd *cmd; + __u16 rc; + + QETH_DBF_TEXT(SETUP, 2, "diastrcb"); + + cmd = (struct qeth_ipa_cmd *)data; + rc = cmd->hdr.return_code; + if (rc) + QETH_CARD_TEXT_(card, 2, "dxter%x", rc); + switch (cmd->data.diagass.action) { + case QETH_DIAGS_CMD_TRACE_QUERY: + break; + case QETH_DIAGS_CMD_TRACE_DISABLE: + switch (rc) { + case 0: + case IPA_RC_INVALID_SUBCMD: + card->info.promisc_mode = SET_PROMISC_MODE_OFF; + dev_info(&card->gdev->dev, "The HiperSockets network " + "traffic analyzer is deactivated\n"); + break; + default: + break; + } + break; + case QETH_DIAGS_CMD_TRACE_ENABLE: + switch (rc) { + case 0: + card->info.promisc_mode = SET_PROMISC_MODE_ON; + dev_info(&card->gdev->dev, "The HiperSockets network " + "traffic analyzer is activated\n"); + break; + case IPA_RC_HARDWARE_AUTH_ERROR: + dev_warn(&card->gdev->dev, "The device is not " + "authorized to run as a HiperSockets network " + "traffic analyzer\n"); + break; + case IPA_RC_TRACE_ALREADY_ACTIVE: + dev_warn(&card->gdev->dev, "A HiperSockets " + "network traffic analyzer is already " + "active in the HiperSockets LAN\n"); + break; + default: + break; + } + break; + default: + QETH_DBF_MESSAGE(2, "Unknown sniffer action (0x%04x) on %s\n", + cmd->data.diagass.action, QETH_CARD_IFNAME(card)); + } + + return 0; +} + +static int +qeth_diags_trace(struct qeth_card *card, enum qeth_diags_trace_cmds diags_cmd) +{ + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + + QETH_DBF_TEXT(SETUP, 2, "diagtrac"); + + iob = qeth_get_ipacmd_buffer(card, IPA_CMD_SET_DIAG_ASS, 0); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + cmd->data.diagass.subcmd_len = 16; + cmd->data.diagass.subcmd = QETH_DIAGS_CMD_TRACE; + cmd->data.diagass.type = QETH_DIAGS_TYPE_HIPERSOCKET; + cmd->data.diagass.action = diags_cmd; + return qeth_send_ipa_cmd(card, iob, qeth_diags_trace_cb, NULL); +} + +static void +qeth_l3_add_mc_to_hash(struct qeth_card *card, struct in_device *in4_dev) +{ + struct ip_mc_list *im4; + struct qeth_ipaddr *tmp, *ipm; + + QETH_CARD_TEXT(card, 4, "addmc"); + + tmp = qeth_l3_get_addr_buffer(QETH_PROT_IPV4); + if (!tmp) + return; + + for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL; + im4 = rcu_dereference(im4->next_rcu)) { + ip_eth_mc_map(im4->multiaddr, tmp->mac); + tmp->u.a4.addr = be32_to_cpu(im4->multiaddr); + tmp->is_multicast = 1; + + ipm = qeth_l3_find_addr_by_ip(card, tmp); + if (ipm) { + /* for mcast, by-IP match means full match */ + ipm->disp_flag = QETH_DISP_ADDR_DO_NOTHING; + } else { + ipm = qeth_l3_get_addr_buffer(QETH_PROT_IPV4); + if (!ipm) + continue; + ether_addr_copy(ipm->mac, tmp->mac); + ipm->u.a4.addr = be32_to_cpu(im4->multiaddr); + ipm->is_multicast = 1; + ipm->disp_flag = QETH_DISP_ADDR_ADD; + hash_add(card->ip_mc_htable, + &ipm->hnode, qeth_l3_ipaddr_hash(ipm)); + } + } + + kfree(tmp); +} + +/* called with rcu_read_lock */ +static void qeth_l3_add_vlan_mc(struct qeth_card *card) +{ + struct in_device *in_dev; + u16 vid; + + QETH_CARD_TEXT(card, 4, "addmcvl"); + + if (!qeth_is_supported(card, IPA_FULL_VLAN)) + return; + + for_each_set_bit(vid, card->active_vlans, VLAN_N_VID) { + struct net_device *netdev; + + netdev = __vlan_find_dev_deep_rcu(card->dev, htons(ETH_P_8021Q), + vid); + if (netdev == NULL || + !(netdev->flags & IFF_UP)) + continue; + in_dev = __in_dev_get_rcu(netdev); + if (!in_dev) + continue; + qeth_l3_add_mc_to_hash(card, in_dev); + } +} + +static void qeth_l3_add_multicast_ipv4(struct qeth_card *card) +{ + struct in_device *in4_dev; + + QETH_CARD_TEXT(card, 4, "chkmcv4"); + + rcu_read_lock(); + in4_dev = __in_dev_get_rcu(card->dev); + if (in4_dev == NULL) + goto unlock; + qeth_l3_add_mc_to_hash(card, in4_dev); + qeth_l3_add_vlan_mc(card); +unlock: + rcu_read_unlock(); +} + +static void qeth_l3_add_mc6_to_hash(struct qeth_card *card, + struct inet6_dev *in6_dev) +{ + struct qeth_ipaddr *ipm; + struct ifmcaddr6 *im6; + struct qeth_ipaddr *tmp; + + QETH_CARD_TEXT(card, 4, "addmc6"); + + tmp = qeth_l3_get_addr_buffer(QETH_PROT_IPV6); + if (!tmp) + return; + + for (im6 = in6_dev->mc_list; im6 != NULL; im6 = im6->next) { + ipv6_eth_mc_map(&im6->mca_addr, tmp->mac); + memcpy(&tmp->u.a6.addr, &im6->mca_addr.s6_addr, + sizeof(struct in6_addr)); + tmp->is_multicast = 1; + + ipm = qeth_l3_find_addr_by_ip(card, tmp); + if (ipm) { + /* for mcast, by-IP match means full match */ + ipm->disp_flag = QETH_DISP_ADDR_DO_NOTHING; + continue; + } + + ipm = qeth_l3_get_addr_buffer(QETH_PROT_IPV6); + if (!ipm) + continue; + + ether_addr_copy(ipm->mac, tmp->mac); + memcpy(&ipm->u.a6.addr, &im6->mca_addr.s6_addr, + sizeof(struct in6_addr)); + ipm->is_multicast = 1; + ipm->disp_flag = QETH_DISP_ADDR_ADD; + hash_add(card->ip_mc_htable, + &ipm->hnode, qeth_l3_ipaddr_hash(ipm)); + + } + kfree(tmp); +} + +/* called with rcu_read_lock */ +static void qeth_l3_add_vlan_mc6(struct qeth_card *card) +{ + struct inet6_dev *in_dev; + u16 vid; + + QETH_CARD_TEXT(card, 4, "admc6vl"); + + if (!qeth_is_supported(card, IPA_FULL_VLAN)) + return; + + for_each_set_bit(vid, card->active_vlans, VLAN_N_VID) { + struct net_device *netdev; + + netdev = __vlan_find_dev_deep_rcu(card->dev, htons(ETH_P_8021Q), + vid); + if (netdev == NULL || + !(netdev->flags & IFF_UP)) + continue; + in_dev = in6_dev_get(netdev); + if (!in_dev) + continue; + read_lock_bh(&in_dev->lock); + qeth_l3_add_mc6_to_hash(card, in_dev); + read_unlock_bh(&in_dev->lock); + in6_dev_put(in_dev); + } +} + +static void qeth_l3_add_multicast_ipv6(struct qeth_card *card) +{ + struct inet6_dev *in6_dev; + + QETH_CARD_TEXT(card, 4, "chkmcv6"); + + if (!qeth_is_supported(card, IPA_IPV6)) + return ; + in6_dev = in6_dev_get(card->dev); + if (!in6_dev) + return; + + rcu_read_lock(); + read_lock_bh(&in6_dev->lock); + qeth_l3_add_mc6_to_hash(card, in6_dev); + qeth_l3_add_vlan_mc6(card); + read_unlock_bh(&in6_dev->lock); + rcu_read_unlock(); + in6_dev_put(in6_dev); +} + +static int qeth_l3_vlan_rx_add_vid(struct net_device *dev, + __be16 proto, u16 vid) +{ + struct qeth_card *card = dev->ml_priv; + + set_bit(vid, card->active_vlans); + return 0; +} + +static int qeth_l3_vlan_rx_kill_vid(struct net_device *dev, + __be16 proto, u16 vid) +{ + struct qeth_card *card = dev->ml_priv; + + QETH_CARD_TEXT_(card, 4, "kid:%d", vid); + + if (qeth_wait_for_threads(card, QETH_RECOVER_THREAD)) { + QETH_CARD_TEXT(card, 3, "kidREC"); + return 0; + } + clear_bit(vid, card->active_vlans); + qeth_l3_set_rx_mode(dev); + return 0; +} + +static void qeth_l3_rebuild_skb(struct qeth_card *card, struct sk_buff *skb, + struct qeth_hdr *hdr) +{ + if (!(hdr->hdr.l3.flags & QETH_HDR_PASSTHRU)) { + u16 prot = (hdr->hdr.l3.flags & QETH_HDR_IPV6) ? ETH_P_IPV6 : + ETH_P_IP; + unsigned char tg_addr[ETH_ALEN]; + + skb_reset_network_header(skb); + switch (hdr->hdr.l3.flags & QETH_HDR_CAST_MASK) { + case QETH_CAST_MULTICAST: + if (prot == ETH_P_IP) + ip_eth_mc_map(ip_hdr(skb)->daddr, tg_addr); + else + ipv6_eth_mc_map(&ipv6_hdr(skb)->daddr, tg_addr); + + card->stats.multicast++; + break; + case QETH_CAST_BROADCAST: + ether_addr_copy(tg_addr, card->dev->broadcast); + card->stats.multicast++; + break; + default: + if (card->options.sniffer) + skb->pkt_type = PACKET_OTHERHOST; + ether_addr_copy(tg_addr, card->dev->dev_addr); + } + + if (hdr->hdr.l3.ext_flags & QETH_HDR_EXT_SRC_MAC_ADDR) + card->dev->header_ops->create(skb, card->dev, prot, + tg_addr, &hdr->hdr.l3.next_hop.rx.src_mac, + skb->len); + else + card->dev->header_ops->create(skb, card->dev, prot, + tg_addr, "FAKELL", skb->len); + } + + skb->protocol = eth_type_trans(skb, card->dev); + + /* copy VLAN tag from hdr into skb */ + if (!card->options.sniffer && + (hdr->hdr.l3.ext_flags & (QETH_HDR_EXT_VLAN_FRAME | + QETH_HDR_EXT_INCLUDE_VLAN_TAG))) { + u16 tag = (hdr->hdr.l3.ext_flags & QETH_HDR_EXT_VLAN_FRAME) ? + hdr->hdr.l3.vlan_id : + hdr->hdr.l3.next_hop.rx.vlan_id; + __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), tag); + } + + qeth_rx_csum(card, skb, hdr->hdr.l3.ext_flags); +} + +static int qeth_l3_process_inbound_buffer(struct qeth_card *card, + int budget, int *done) +{ + int work_done = 0; + struct sk_buff *skb; + struct qeth_hdr *hdr; + unsigned int len; + __u16 magic; + + *done = 0; + WARN_ON_ONCE(!budget); + while (budget) { + skb = qeth_core_get_next_skb(card, + &card->qdio.in_q->bufs[card->rx.b_index], + &card->rx.b_element, &card->rx.e_offset, &hdr); + if (!skb) { + *done = 1; + break; + } + switch (hdr->hdr.l3.id) { + case QETH_HEADER_TYPE_LAYER3: + magic = *(__u16 *)skb->data; + if ((card->info.type == QETH_CARD_TYPE_IQD) && + (magic == ETH_P_AF_IUCV)) { + skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); + len = skb->len; + card->dev->header_ops->create(skb, card->dev, 0, + card->dev->dev_addr, "FAKELL", len); + skb_reset_mac_header(skb); + netif_receive_skb(skb); + } else { + qeth_l3_rebuild_skb(card, skb, hdr); + len = skb->len; + napi_gro_receive(&card->napi, skb); + } + break; + case QETH_HEADER_TYPE_LAYER2: /* for HiperSockets sniffer */ + skb->protocol = eth_type_trans(skb, skb->dev); + len = skb->len; + netif_receive_skb(skb); + break; + default: + dev_kfree_skb_any(skb); + QETH_CARD_TEXT(card, 3, "inbunkno"); + QETH_DBF_HEX(CTRL, 3, hdr, sizeof(*hdr)); + continue; + } + work_done++; + budget--; + card->stats.rx_packets++; + card->stats.rx_bytes += len; + } + return work_done; +} + +static void qeth_l3_stop_card(struct qeth_card *card, int recovery_mode) +{ + QETH_DBF_TEXT(SETUP, 2, "stopcard"); + QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *)); + + qeth_set_allowed_threads(card, 0, 1); + if (card->options.sniffer && + (card->info.promisc_mode == SET_PROMISC_MODE_ON)) + qeth_diags_trace(card, QETH_DIAGS_CMD_TRACE_DISABLE); + if (card->read.state == CH_STATE_UP && + card->write.state == CH_STATE_UP && + (card->state == CARD_STATE_UP)) { + if (recovery_mode) + qeth_l3_stop(card->dev); + else { + rtnl_lock(); + dev_close(card->dev); + rtnl_unlock(); + } + card->state = CARD_STATE_SOFTSETUP; + } + if (card->state == CARD_STATE_SOFTSETUP) { + qeth_l3_clear_ip_htable(card, 1); + qeth_clear_ipacmd_list(card); + card->state = CARD_STATE_HARDSETUP; + } + if (card->state == CARD_STATE_HARDSETUP) { + qeth_qdio_clear_card(card, 0); + qeth_clear_qdio_buffers(card); + qeth_clear_working_pool_list(card); + card->state = CARD_STATE_DOWN; + } + if (card->state == CARD_STATE_DOWN) { + qeth_clear_cmd_buffers(&card->read); + qeth_clear_cmd_buffers(&card->write); + } +} + +/* + * test for and Switch promiscuous mode (on or off) + * either for guestlan or HiperSocket Sniffer + */ +static void +qeth_l3_handle_promisc_mode(struct qeth_card *card) +{ + struct net_device *dev = card->dev; + + if (((dev->flags & IFF_PROMISC) && + (card->info.promisc_mode == SET_PROMISC_MODE_ON)) || + (!(dev->flags & IFF_PROMISC) && + (card->info.promisc_mode == SET_PROMISC_MODE_OFF))) + return; + + if (card->info.guestlan) { /* Guestlan trace */ + if (qeth_adp_supported(card, IPA_SETADP_SET_PROMISC_MODE)) + qeth_setadp_promisc_mode(card); + } else if (card->options.sniffer && /* HiperSockets trace */ + qeth_adp_supported(card, IPA_SETADP_SET_DIAG_ASSIST)) { + if (dev->flags & IFF_PROMISC) { + QETH_CARD_TEXT(card, 3, "+promisc"); + qeth_diags_trace(card, QETH_DIAGS_CMD_TRACE_ENABLE); + } else { + QETH_CARD_TEXT(card, 3, "-promisc"); + qeth_diags_trace(card, QETH_DIAGS_CMD_TRACE_DISABLE); + } + } +} + +static void qeth_l3_set_rx_mode(struct net_device *dev) +{ + struct qeth_card *card = dev->ml_priv; + struct qeth_ipaddr *addr; + struct hlist_node *tmp; + int i, rc; + + QETH_CARD_TEXT(card, 3, "setmulti"); + if (qeth_threads_running(card, QETH_RECOVER_THREAD) && + (card->state != CARD_STATE_UP)) + return; + if (!card->options.sniffer) { + spin_lock_bh(&card->mclock); + + qeth_l3_add_multicast_ipv4(card); + qeth_l3_add_multicast_ipv6(card); + + hash_for_each_safe(card->ip_mc_htable, i, tmp, addr, hnode) { + switch (addr->disp_flag) { + case QETH_DISP_ADDR_DELETE: + rc = qeth_l3_deregister_addr_entry(card, addr); + if (!rc || rc == IPA_RC_MC_ADDR_NOT_FOUND) { + hash_del(&addr->hnode); + kfree(addr); + } + break; + case QETH_DISP_ADDR_ADD: + rc = qeth_l3_register_addr_entry(card, addr); + if (rc && rc != IPA_RC_LAN_OFFLINE) { + hash_del(&addr->hnode); + kfree(addr); + break; + } + addr->ref_counter = 1; + /* fall through */ + default: + /* for next call to set_rx_mode(): */ + addr->disp_flag = QETH_DISP_ADDR_DELETE; + } + } + + spin_unlock_bh(&card->mclock); + + if (!qeth_adp_supported(card, IPA_SETADP_SET_PROMISC_MODE)) + return; + } + qeth_l3_handle_promisc_mode(card); +} + +static const char *qeth_l3_arp_get_error_cause(int *rc) +{ + switch (*rc) { + case QETH_IPA_ARP_RC_FAILED: + *rc = -EIO; + return "operation failed"; + case QETH_IPA_ARP_RC_NOTSUPP: + *rc = -EOPNOTSUPP; + return "operation not supported"; + case QETH_IPA_ARP_RC_OUT_OF_RANGE: + *rc = -EINVAL; + return "argument out of range"; + case QETH_IPA_ARP_RC_Q_NOTSUPP: + *rc = -EOPNOTSUPP; + return "query operation not supported"; + case QETH_IPA_ARP_RC_Q_NO_DATA: + *rc = -ENOENT; + return "no query data available"; + default: + return "unknown error"; + } +} + +static int qeth_l3_arp_set_no_entries(struct qeth_card *card, int no_entries) +{ + int tmp; + int rc; + + QETH_CARD_TEXT(card, 3, "arpstnoe"); + + /* + * currently GuestLAN only supports the ARP assist function + * IPA_CMD_ASS_ARP_QUERY_INFO, but not IPA_CMD_ASS_ARP_SET_NO_ENTRIES; + * thus we say EOPNOTSUPP for this ARP function + */ + if (card->info.guestlan) + return -EOPNOTSUPP; + if (!qeth_is_supported(card, IPA_ARP_PROCESSING)) { + return -EOPNOTSUPP; + } + rc = qeth_send_simple_setassparms(card, IPA_ARP_PROCESSING, + IPA_CMD_ASS_ARP_SET_NO_ENTRIES, + no_entries); + if (rc) { + tmp = rc; + QETH_DBF_MESSAGE(2, "Could not set number of ARP entries on " + "%s: %s (0x%x/%d)\n", QETH_CARD_IFNAME(card), + qeth_l3_arp_get_error_cause(&rc), tmp, tmp); + } + return rc; +} + +static __u32 get_arp_entry_size(struct qeth_card *card, + struct qeth_arp_query_data *qdata, + struct qeth_arp_entrytype *type, __u8 strip_entries) +{ + __u32 rc; + __u8 is_hsi; + + is_hsi = qdata->reply_bits == 5; + if (type->ip == QETHARP_IP_ADDR_V4) { + QETH_CARD_TEXT(card, 4, "arpev4"); + if (strip_entries) { + rc = is_hsi ? sizeof(struct qeth_arp_qi_entry5_short) : + sizeof(struct qeth_arp_qi_entry7_short); + } else { + rc = is_hsi ? sizeof(struct qeth_arp_qi_entry5) : + sizeof(struct qeth_arp_qi_entry7); + } + } else if (type->ip == QETHARP_IP_ADDR_V6) { + QETH_CARD_TEXT(card, 4, "arpev6"); + if (strip_entries) { + rc = is_hsi ? + sizeof(struct qeth_arp_qi_entry5_short_ipv6) : + sizeof(struct qeth_arp_qi_entry7_short_ipv6); + } else { + rc = is_hsi ? + sizeof(struct qeth_arp_qi_entry5_ipv6) : + sizeof(struct qeth_arp_qi_entry7_ipv6); + } + } else { + QETH_CARD_TEXT(card, 4, "arpinv"); + rc = 0; + } + + return rc; +} + +static int arpentry_matches_prot(struct qeth_arp_entrytype *type, __u16 prot) +{ + return (type->ip == QETHARP_IP_ADDR_V4 && prot == QETH_PROT_IPV4) || + (type->ip == QETHARP_IP_ADDR_V6 && prot == QETH_PROT_IPV6); +} + +static int qeth_l3_arp_query_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd; + struct qeth_arp_query_data *qdata; + struct qeth_arp_query_info *qinfo; + int i; + int e; + int entrybytes_done; + int stripped_bytes; + __u8 do_strip_entries; + + QETH_CARD_TEXT(card, 3, "arpquecb"); + + qinfo = (struct qeth_arp_query_info *) reply->param; + cmd = (struct qeth_ipa_cmd *) data; + QETH_CARD_TEXT_(card, 4, "%i", cmd->hdr.prot_version); + if (cmd->hdr.return_code) { + QETH_CARD_TEXT(card, 4, "arpcberr"); + QETH_CARD_TEXT_(card, 4, "%i", cmd->hdr.return_code); + return 0; + } + if (cmd->data.setassparms.hdr.return_code) { + cmd->hdr.return_code = cmd->data.setassparms.hdr.return_code; + QETH_CARD_TEXT(card, 4, "setaperr"); + QETH_CARD_TEXT_(card, 4, "%i", cmd->hdr.return_code); + return 0; + } + qdata = &cmd->data.setassparms.data.query_arp; + QETH_CARD_TEXT_(card, 4, "anoen%i", qdata->no_entries); + + do_strip_entries = (qinfo->mask_bits & QETH_QARP_STRIP_ENTRIES) > 0; + stripped_bytes = do_strip_entries ? QETH_QARP_MEDIASPECIFIC_BYTES : 0; + entrybytes_done = 0; + for (e = 0; e < qdata->no_entries; ++e) { + char *cur_entry; + __u32 esize; + struct qeth_arp_entrytype *etype; + + cur_entry = &qdata->data + entrybytes_done; + etype = &((struct qeth_arp_qi_entry5 *) cur_entry)->type; + if (!arpentry_matches_prot(etype, cmd->hdr.prot_version)) { + QETH_CARD_TEXT(card, 4, "pmis"); + QETH_CARD_TEXT_(card, 4, "%i", etype->ip); + break; + } + esize = get_arp_entry_size(card, qdata, etype, + do_strip_entries); + QETH_CARD_TEXT_(card, 5, "esz%i", esize); + if (!esize) + break; + + if ((qinfo->udata_len - qinfo->udata_offset) < esize) { + QETH_CARD_TEXT_(card, 4, "qaer3%i", -ENOMEM); + cmd->hdr.return_code = IPA_RC_ENOMEM; + goto out_error; + } + + memcpy(qinfo->udata + qinfo->udata_offset, + &qdata->data + entrybytes_done + stripped_bytes, + esize); + entrybytes_done += esize + stripped_bytes; + qinfo->udata_offset += esize; + ++qinfo->no_entries; + } + /* check if all replies received ... */ + if (cmd->data.setassparms.hdr.seq_no < + cmd->data.setassparms.hdr.number_of_replies) + return 1; + QETH_CARD_TEXT_(card, 4, "nove%i", qinfo->no_entries); + memcpy(qinfo->udata, &qinfo->no_entries, 4); + /* keep STRIP_ENTRIES flag so the user program can distinguish + * stripped entries from normal ones */ + if (qinfo->mask_bits & QETH_QARP_STRIP_ENTRIES) + qdata->reply_bits |= QETH_QARP_STRIP_ENTRIES; + memcpy(qinfo->udata + QETH_QARP_MASK_OFFSET, &qdata->reply_bits, 2); + QETH_CARD_TEXT_(card, 4, "rc%i", 0); + return 0; +out_error: + i = 0; + memcpy(qinfo->udata, &i, 4); + return 0; +} + +static int qeth_l3_send_ipa_arp_cmd(struct qeth_card *card, + struct qeth_cmd_buffer *iob, int len, + int (*reply_cb)(struct qeth_card *, struct qeth_reply *, + unsigned long), + void *reply_param) +{ + QETH_CARD_TEXT(card, 4, "sendarp"); + + memcpy(iob->data, IPA_PDU_HEADER, IPA_PDU_HEADER_SIZE); + memcpy(QETH_IPA_CMD_DEST_ADDR(iob->data), + &card->token.ulp_connection_r, QETH_MPC_TOKEN_LENGTH); + return qeth_send_control_data(card, IPA_PDU_HEADER_SIZE + len, iob, + reply_cb, reply_param); +} + +static int qeth_l3_query_arp_cache_info(struct qeth_card *card, + enum qeth_prot_versions prot, + struct qeth_arp_query_info *qinfo) +{ + struct qeth_cmd_buffer *iob; + struct qeth_ipa_cmd *cmd; + int tmp; + int rc; + + QETH_CARD_TEXT_(card, 3, "qarpipv%i", prot); + + iob = qeth_get_setassparms_cmd(card, IPA_ARP_PROCESSING, + IPA_CMD_ASS_ARP_QUERY_INFO, + sizeof(struct qeth_arp_query_data) + - sizeof(char), + prot); + if (!iob) + return -ENOMEM; + cmd = __ipa_cmd(iob); + cmd->data.setassparms.data.query_arp.request_bits = 0x000F; + cmd->data.setassparms.data.query_arp.reply_bits = 0; + cmd->data.setassparms.data.query_arp.no_entries = 0; + rc = qeth_l3_send_ipa_arp_cmd(card, iob, + QETH_SETASS_BASE_LEN+QETH_ARP_CMD_LEN, + qeth_l3_arp_query_cb, (void *)qinfo); + if (rc) { + tmp = rc; + QETH_DBF_MESSAGE(2, + "Error while querying ARP cache on %s: %s " + "(0x%x/%d)\n", QETH_CARD_IFNAME(card), + qeth_l3_arp_get_error_cause(&rc), tmp, tmp); + } + + return rc; +} + +static int qeth_l3_arp_query(struct qeth_card *card, char __user *udata) +{ + struct qeth_arp_query_info qinfo = {0, }; + int rc; + + QETH_CARD_TEXT(card, 3, "arpquery"); + + if (!qeth_is_supported(card,/*IPA_QUERY_ARP_ADDR_INFO*/ + IPA_ARP_PROCESSING)) { + QETH_CARD_TEXT(card, 3, "arpqnsup"); + rc = -EOPNOTSUPP; + goto out; + } + /* get size of userspace buffer and mask_bits -> 6 bytes */ + if (copy_from_user(&qinfo, udata, 6)) { + rc = -EFAULT; + goto out; + } + qinfo.udata = kzalloc(qinfo.udata_len, GFP_KERNEL); + if (!qinfo.udata) { + rc = -ENOMEM; + goto out; + } + qinfo.udata_offset = QETH_QARP_ENTRIES_OFFSET; + rc = qeth_l3_query_arp_cache_info(card, QETH_PROT_IPV4, &qinfo); + if (rc) { + if (copy_to_user(udata, qinfo.udata, 4)) + rc = -EFAULT; + goto free_and_out; + } + if (qinfo.mask_bits & QETH_QARP_WITH_IPV6) { + /* fails in case of GuestLAN QDIO mode */ + qeth_l3_query_arp_cache_info(card, QETH_PROT_IPV6, &qinfo); + } + if (copy_to_user(udata, qinfo.udata, qinfo.udata_len)) { + QETH_CARD_TEXT(card, 4, "qactf"); + rc = -EFAULT; + goto free_and_out; + } + QETH_CARD_TEXT(card, 4, "qacts"); + +free_and_out: + kfree(qinfo.udata); +out: + return rc; +} + +static int qeth_l3_arp_add_entry(struct qeth_card *card, + struct qeth_arp_cache_entry *entry) +{ + struct qeth_cmd_buffer *iob; + char buf[16]; + int tmp; + int rc; + + QETH_CARD_TEXT(card, 3, "arpadent"); + + /* + * currently GuestLAN only supports the ARP assist function + * IPA_CMD_ASS_ARP_QUERY_INFO, but not IPA_CMD_ASS_ARP_ADD_ENTRY; + * thus we say EOPNOTSUPP for this ARP function + */ + if (card->info.guestlan) + return -EOPNOTSUPP; + if (!qeth_is_supported(card, IPA_ARP_PROCESSING)) { + return -EOPNOTSUPP; + } + + iob = qeth_get_setassparms_cmd(card, IPA_ARP_PROCESSING, + IPA_CMD_ASS_ARP_ADD_ENTRY, + sizeof(struct qeth_arp_cache_entry), + QETH_PROT_IPV4); + if (!iob) + return -ENOMEM; + rc = qeth_send_setassparms(card, iob, + sizeof(struct qeth_arp_cache_entry), + (unsigned long) entry, + qeth_setassparms_cb, NULL); + if (rc) { + tmp = rc; + qeth_l3_ipaddr4_to_string((u8 *)entry->ipaddr, buf); + QETH_DBF_MESSAGE(2, "Could not add ARP entry for address %s " + "on %s: %s (0x%x/%d)\n", buf, QETH_CARD_IFNAME(card), + qeth_l3_arp_get_error_cause(&rc), tmp, tmp); + } + return rc; +} + +static int qeth_l3_arp_remove_entry(struct qeth_card *card, + struct qeth_arp_cache_entry *entry) +{ + struct qeth_cmd_buffer *iob; + char buf[16] = {0, }; + int tmp; + int rc; + + QETH_CARD_TEXT(card, 3, "arprment"); + + /* + * currently GuestLAN only supports the ARP assist function + * IPA_CMD_ASS_ARP_QUERY_INFO, but not IPA_CMD_ASS_ARP_REMOVE_ENTRY; + * thus we say EOPNOTSUPP for this ARP function + */ + if (card->info.guestlan) + return -EOPNOTSUPP; + if (!qeth_is_supported(card, IPA_ARP_PROCESSING)) { + return -EOPNOTSUPP; + } + memcpy(buf, entry, 12); + iob = qeth_get_setassparms_cmd(card, IPA_ARP_PROCESSING, + IPA_CMD_ASS_ARP_REMOVE_ENTRY, + 12, + QETH_PROT_IPV4); + if (!iob) + return -ENOMEM; + rc = qeth_send_setassparms(card, iob, + 12, (unsigned long)buf, + qeth_setassparms_cb, NULL); + if (rc) { + tmp = rc; + memset(buf, 0, 16); + qeth_l3_ipaddr4_to_string((u8 *)entry->ipaddr, buf); + QETH_DBF_MESSAGE(2, "Could not delete ARP entry for address %s" + " on %s: %s (0x%x/%d)\n", buf, QETH_CARD_IFNAME(card), + qeth_l3_arp_get_error_cause(&rc), tmp, tmp); + } + return rc; +} + +static int qeth_l3_arp_flush_cache(struct qeth_card *card) +{ + int rc; + int tmp; + + QETH_CARD_TEXT(card, 3, "arpflush"); + + /* + * currently GuestLAN only supports the ARP assist function + * IPA_CMD_ASS_ARP_QUERY_INFO, but not IPA_CMD_ASS_ARP_FLUSH_CACHE; + * thus we say EOPNOTSUPP for this ARP function + */ + if (card->info.guestlan || (card->info.type == QETH_CARD_TYPE_IQD)) + return -EOPNOTSUPP; + if (!qeth_is_supported(card, IPA_ARP_PROCESSING)) { + return -EOPNOTSUPP; + } + rc = qeth_send_simple_setassparms(card, IPA_ARP_PROCESSING, + IPA_CMD_ASS_ARP_FLUSH_CACHE, 0); + if (rc) { + tmp = rc; + QETH_DBF_MESSAGE(2, "Could not flush ARP cache on %s: %s " + "(0x%x/%d)\n", QETH_CARD_IFNAME(card), + qeth_l3_arp_get_error_cause(&rc), tmp, tmp); + } + return rc; +} + +static int qeth_l3_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) +{ + struct qeth_card *card = dev->ml_priv; + struct qeth_arp_cache_entry arp_entry; + int rc = 0; + + switch (cmd) { + case SIOC_QETH_ARP_SET_NO_ENTRIES: + if (!capable(CAP_NET_ADMIN)) { + rc = -EPERM; + break; + } + rc = qeth_l3_arp_set_no_entries(card, rq->ifr_ifru.ifru_ivalue); + break; + case SIOC_QETH_ARP_QUERY_INFO: + if (!capable(CAP_NET_ADMIN)) { + rc = -EPERM; + break; + } + rc = qeth_l3_arp_query(card, rq->ifr_ifru.ifru_data); + break; + case SIOC_QETH_ARP_ADD_ENTRY: + if (!capable(CAP_NET_ADMIN)) { + rc = -EPERM; + break; + } + if (copy_from_user(&arp_entry, rq->ifr_ifru.ifru_data, + sizeof(struct qeth_arp_cache_entry))) + rc = -EFAULT; + else + rc = qeth_l3_arp_add_entry(card, &arp_entry); + break; + case SIOC_QETH_ARP_REMOVE_ENTRY: + if (!capable(CAP_NET_ADMIN)) { + rc = -EPERM; + break; + } + if (copy_from_user(&arp_entry, rq->ifr_ifru.ifru_data, + sizeof(struct qeth_arp_cache_entry))) + rc = -EFAULT; + else + rc = qeth_l3_arp_remove_entry(card, &arp_entry); + break; + case SIOC_QETH_ARP_FLUSH_CACHE: + if (!capable(CAP_NET_ADMIN)) { + rc = -EPERM; + break; + } + rc = qeth_l3_arp_flush_cache(card); + break; + default: + rc = -EOPNOTSUPP; + } + return rc; +} + +static int qeth_l3_get_cast_type(struct sk_buff *skb) +{ + struct neighbour *n = NULL; + struct dst_entry *dst; + + rcu_read_lock(); + dst = skb_dst(skb); + if (dst) + n = dst_neigh_lookup_skb(dst, skb); + if (n) { + int cast_type = n->type; + + rcu_read_unlock(); + neigh_release(n); + if ((cast_type == RTN_BROADCAST) || + (cast_type == RTN_MULTICAST) || + (cast_type == RTN_ANYCAST)) + return cast_type; + return RTN_UNICAST; + } + rcu_read_unlock(); + + /* no neighbour (eg AF_PACKET), fall back to target's IP address ... */ + if (be16_to_cpu(skb->protocol) == ETH_P_IPV6) + return ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) ? + RTN_MULTICAST : RTN_UNICAST; + else if (be16_to_cpu(skb->protocol) == ETH_P_IP) + return ipv4_is_multicast(ip_hdr(skb)->daddr) ? + RTN_MULTICAST : RTN_UNICAST; + + /* ... and MAC address */ + if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, skb->dev->broadcast)) + return RTN_BROADCAST; + if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) + return RTN_MULTICAST; + + /* default to unicast */ + return RTN_UNICAST; +} + +static void qeth_l3_fill_af_iucv_hdr(struct qeth_hdr *hdr, struct sk_buff *skb, + unsigned int data_len) +{ + char daddr[16]; + struct af_iucv_trans_hdr *iucv_hdr; + + memset(hdr, 0, sizeof(struct qeth_hdr)); + hdr->hdr.l3.id = QETH_HEADER_TYPE_LAYER3; + hdr->hdr.l3.length = data_len; + hdr->hdr.l3.flags = QETH_HDR_IPV6 | QETH_CAST_UNICAST; + + iucv_hdr = (struct af_iucv_trans_hdr *)(skb_mac_header(skb) + ETH_HLEN); + memset(daddr, 0, sizeof(daddr)); + daddr[0] = 0xfe; + daddr[1] = 0x80; + memcpy(&daddr[8], iucv_hdr->destUserID, 8); + memcpy(hdr->hdr.l3.next_hop.ipv6_addr, daddr, 16); +} + +static u8 qeth_l3_cast_type_to_flag(int cast_type) +{ + if (cast_type == RTN_MULTICAST) + return QETH_CAST_MULTICAST; + if (cast_type == RTN_ANYCAST) + return QETH_CAST_ANYCAST; + if (cast_type == RTN_BROADCAST) + return QETH_CAST_BROADCAST; + return QETH_CAST_UNICAST; +} + +static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr, + struct sk_buff *skb, int ipv, int cast_type, + unsigned int data_len) +{ + memset(hdr, 0, sizeof(struct qeth_hdr)); + hdr->hdr.l3.id = QETH_HEADER_TYPE_LAYER3; + hdr->hdr.l3.length = data_len; + + /* + * before we're going to overwrite this location with next hop ip. + * v6 uses passthrough, v4 sets the tag in the QDIO header. + */ + if (skb_vlan_tag_present(skb)) { + if ((ipv == 4) || (card->info.type == QETH_CARD_TYPE_IQD)) + hdr->hdr.l3.ext_flags = QETH_HDR_EXT_VLAN_FRAME; + else + hdr->hdr.l3.ext_flags = QETH_HDR_EXT_INCLUDE_VLAN_TAG; + hdr->hdr.l3.vlan_id = skb_vlan_tag_get(skb); + } + + if (!skb_is_gso(skb) && skb->ip_summed == CHECKSUM_PARTIAL) { + qeth_tx_csum(skb, &hdr->hdr.l3.ext_flags, ipv); + if (card->options.performance_stats) + card->perf_stats.tx_csum++; + } + + /* OSA only: */ + if (!ipv) { + hdr->hdr.l3.flags = QETH_HDR_PASSTHRU; + if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, + skb->dev->broadcast)) + hdr->hdr.l3.flags |= QETH_CAST_BROADCAST; + else + hdr->hdr.l3.flags |= (cast_type == RTN_MULTICAST) ? + QETH_CAST_MULTICAST : QETH_CAST_UNICAST; + return; + } + + hdr->hdr.l3.flags = qeth_l3_cast_type_to_flag(cast_type); + rcu_read_lock(); + if (ipv == 4) { + struct rtable *rt = skb_rtable(skb); + + *((__be32 *) &hdr->hdr.l3.next_hop.ipv4.addr) = (rt) ? + rt_nexthop(rt, ip_hdr(skb)->daddr) : + ip_hdr(skb)->daddr; + } else { + /* IPv6 */ + const struct rt6_info *rt = skb_rt6_info(skb); + const struct in6_addr *next_hop; + + if (rt && !ipv6_addr_any(&rt->rt6i_gateway)) + next_hop = &rt->rt6i_gateway; + else + next_hop = &ipv6_hdr(skb)->daddr; + memcpy(hdr->hdr.l3.next_hop.ipv6_addr, next_hop, 16); + + hdr->hdr.l3.flags |= QETH_HDR_IPV6; + if (card->info.type != QETH_CARD_TYPE_IQD) + hdr->hdr.l3.flags |= QETH_HDR_PASSTHRU; + } + rcu_read_unlock(); +} + +static void qeth_tso_fill_header(struct qeth_card *card, + struct qeth_hdr *qhdr, struct sk_buff *skb) +{ + struct qeth_hdr_tso *hdr = (struct qeth_hdr_tso *)qhdr; + struct tcphdr *tcph = tcp_hdr(skb); + struct iphdr *iph = ip_hdr(skb); + struct ipv6hdr *ip6h = ipv6_hdr(skb); + + /*fix header to TSO values ...*/ + hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO; + /*set values which are fix for the first approach ...*/ + hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso); + hdr->ext.imb_hdr_no = 1; + hdr->ext.hdr_type = 1; + hdr->ext.hdr_version = 1; + hdr->ext.hdr_len = 28; + /*insert non-fix values */ + hdr->ext.mss = skb_shinfo(skb)->gso_size; + hdr->ext.dg_hdr_len = (__u16)(ip_hdrlen(skb) + tcp_hdrlen(skb)); + hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len - + sizeof(struct qeth_hdr_tso)); + tcph->check = 0; + if (be16_to_cpu(skb->protocol) == ETH_P_IPV6) { + ip6h->payload_len = 0; + tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, + 0, IPPROTO_TCP, 0); + } else { + /*OSA want us to set these values ...*/ + tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, + 0, IPPROTO_TCP, 0); + iph->tot_len = 0; + iph->check = 0; + } +} + +/** + * qeth_l3_get_elements_no_tso() - find number of SBALEs for skb data for tso + * @card: qeth card structure, to check max. elems. + * @skb: SKB address + * @extra_elems: extra elems needed, to check against max. + * + * Returns the number of pages, and thus QDIO buffer elements, needed to cover + * skb data, including linear part and fragments, but excluding TCP header. + * (Exclusion of TCP header distinguishes it from qeth_get_elements_no().) + * Checks if the result plus extra_elems fits under the limit for the card. + * Returns 0 if it does not. + * Note: extra_elems is not included in the returned result. + */ +static int qeth_l3_get_elements_no_tso(struct qeth_card *card, + struct sk_buff *skb, int extra_elems) +{ + addr_t start = (addr_t)tcp_hdr(skb) + tcp_hdrlen(skb); + addr_t end = (addr_t)skb->data + skb_headlen(skb); + int elements = qeth_get_elements_for_frags(skb); + + if (start != end) + elements += qeth_get_elements_for_range(start, end); + + if ((elements + extra_elems) > QETH_MAX_BUFFER_ELEMENTS(card)) { + QETH_DBF_MESSAGE(2, + "Invalid size of TSO IP packet (Number=%d / Length=%d). Discarded.\n", + elements + extra_elems, skb->len); + return 0; + } + return elements; +} + +static int qeth_l3_xmit_offload(struct qeth_card *card, struct sk_buff *skb, + struct qeth_qdio_out_q *queue, int ipv, + int cast_type) +{ + const unsigned int hw_hdr_len = sizeof(struct qeth_hdr); + unsigned int frame_len, elements; + unsigned char eth_hdr[ETH_HLEN]; + struct qeth_hdr *hdr = NULL; + unsigned int hd_len = 0; + int push_len, rc; + bool is_sg; + + /* re-use the L2 header area for the HW header: */ + rc = skb_cow_head(skb, hw_hdr_len - ETH_HLEN); + if (rc) + return rc; + skb_copy_from_linear_data(skb, eth_hdr, ETH_HLEN); + skb_pull(skb, ETH_HLEN); + frame_len = skb->len; + + push_len = qeth_add_hw_header(card, skb, &hdr, hw_hdr_len, 0, + &elements); + if (push_len < 0) + return push_len; + if (!push_len) { + /* hdr was added discontiguous from skb->data */ + hd_len = hw_hdr_len; + } + + if (skb->protocol == htons(ETH_P_AF_IUCV)) + qeth_l3_fill_af_iucv_hdr(hdr, skb, frame_len); + else + qeth_l3_fill_header(card, hdr, skb, ipv, cast_type, frame_len); + + is_sg = skb_is_nonlinear(skb); + if (IS_IQD(card)) { + rc = qeth_do_send_packet_fast(queue, skb, hdr, 0, hd_len); + } else { + /* TODO: drop skb_orphan() once TX completion is fast enough */ + skb_orphan(skb); + rc = qeth_do_send_packet(card, queue, skb, hdr, 0, hd_len, + elements); + } + + if (!rc) { + if (card->options.performance_stats) { + card->perf_stats.buf_elements_sent += elements; + if (is_sg) + card->perf_stats.sg_skbs_sent++; + } + } else { + if (!push_len) + kmem_cache_free(qeth_core_header_cache, hdr); + if (rc == -EBUSY) { + /* roll back to ETH header */ + skb_pull(skb, push_len); + skb_push(skb, ETH_HLEN); + skb_copy_to_linear_data(skb, eth_hdr, ETH_HLEN); + } + } + return rc; +} + +static int qeth_l3_xmit(struct qeth_card *card, struct sk_buff *skb, + struct qeth_qdio_out_q *queue, int ipv, int cast_type) +{ + int elements, len, rc; + __be16 *tag; + struct qeth_hdr *hdr = NULL; + int hdr_elements = 0; + struct sk_buff *new_skb = NULL; + int tx_bytes = skb->len; + unsigned int hd_len; + bool use_tso, is_sg; + + /* Ignore segment size from skb_is_gso(), 1 page is always used. */ + use_tso = skb_is_gso(skb) && + (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4); + + /* create a clone with writeable headroom */ + new_skb = skb_realloc_headroom(skb, sizeof(struct qeth_hdr_tso) + + VLAN_HLEN); + if (!new_skb) + return -ENOMEM; + + if (ipv == 4) { + skb_pull(new_skb, ETH_HLEN); + } else if (skb_vlan_tag_present(new_skb)) { + skb_push(new_skb, VLAN_HLEN); + skb_copy_to_linear_data(new_skb, new_skb->data + 4, 4); + skb_copy_to_linear_data_offset(new_skb, 4, + new_skb->data + 8, 4); + skb_copy_to_linear_data_offset(new_skb, 8, + new_skb->data + 12, 4); + tag = (__be16 *)(new_skb->data + 12); + *tag = cpu_to_be16(ETH_P_8021Q); + *(tag + 1) = cpu_to_be16(skb_vlan_tag_get(new_skb)); + } + + /* fix hardware limitation: as long as we do not have sbal + * chaining we can not send long frag lists + */ + if ((use_tso && !qeth_l3_get_elements_no_tso(card, new_skb, 1)) || + (!use_tso && !qeth_get_elements_no(card, new_skb, 0, 0))) { + rc = skb_linearize(new_skb); + + if (card->options.performance_stats) { + if (rc) + card->perf_stats.tx_linfail++; + else + card->perf_stats.tx_lin++; + } + if (rc) + goto out; + } + + if (use_tso) { + hdr = skb_push(new_skb, sizeof(struct qeth_hdr_tso)); + memset(hdr, 0, sizeof(struct qeth_hdr_tso)); + qeth_l3_fill_header(card, hdr, new_skb, ipv, cast_type, + new_skb->len - sizeof(struct qeth_hdr_tso)); + qeth_tso_fill_header(card, hdr, new_skb); + hdr_elements++; + } else { + hdr = skb_push(new_skb, sizeof(struct qeth_hdr)); + qeth_l3_fill_header(card, hdr, new_skb, ipv, cast_type, + new_skb->len - sizeof(struct qeth_hdr)); + } + + elements = use_tso ? + qeth_l3_get_elements_no_tso(card, new_skb, hdr_elements) : + qeth_get_elements_no(card, new_skb, hdr_elements, 0); + if (!elements) { + rc = -E2BIG; + goto out; + } + elements += hdr_elements; + + if (use_tso) { + hd_len = sizeof(struct qeth_hdr_tso) + + ip_hdrlen(new_skb) + tcp_hdrlen(new_skb); + len = hd_len; + } else { + hd_len = 0; + len = sizeof(struct qeth_hdr_layer3); + } + + if (qeth_hdr_chk_and_bounce(new_skb, &hdr, len)) { + rc = -EINVAL; + goto out; + } + + is_sg = skb_is_nonlinear(new_skb); + rc = qeth_do_send_packet(card, queue, new_skb, hdr, hd_len, hd_len, + elements); +out: + if (!rc) { + if (new_skb != skb) + dev_kfree_skb_any(skb); + if (card->options.performance_stats) { + card->perf_stats.buf_elements_sent += elements; + if (is_sg) + card->perf_stats.sg_skbs_sent++; + if (use_tso) { + card->perf_stats.large_send_bytes += tx_bytes; + card->perf_stats.large_send_cnt++; + } + } + } else { + if (new_skb != skb) + dev_kfree_skb_any(new_skb); + } + return rc; +} + +static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + int cast_type = qeth_l3_get_cast_type(skb); + struct qeth_card *card = dev->ml_priv; + int ipv = qeth_get_ip_version(skb); + struct qeth_qdio_out_q *queue; + int tx_bytes = skb->len; + int rc; + + if (IS_IQD(card)) { + if (card->options.sniffer) + goto tx_drop; + if ((card->options.cq != QETH_CQ_ENABLED && !ipv) || + (card->options.cq == QETH_CQ_ENABLED && + skb->protocol != htons(ETH_P_AF_IUCV))) + goto tx_drop; + } + + if (card->state != CARD_STATE_UP || !card->lan_online) { + card->stats.tx_carrier_errors++; + goto tx_drop; + } + + if (cast_type == RTN_BROADCAST && !card->info.broadcast_capable) + goto tx_drop; + + queue = qeth_get_tx_queue(card, skb, ipv, cast_type); + + if (card->options.performance_stats) { + card->perf_stats.outbound_cnt++; + card->perf_stats.outbound_start_time = qeth_get_micros(); + } + netif_stop_queue(dev); + + if (IS_IQD(card) || (!skb_is_gso(skb) && ipv == 4)) + rc = qeth_l3_xmit_offload(card, skb, queue, ipv, cast_type); + else + rc = qeth_l3_xmit(card, skb, queue, ipv, cast_type); + + if (!rc) { + card->stats.tx_packets++; + card->stats.tx_bytes += tx_bytes; + if (card->options.performance_stats) + card->perf_stats.outbound_time += qeth_get_micros() - + card->perf_stats.outbound_start_time; + netif_wake_queue(dev); + return NETDEV_TX_OK; + } else if (rc == -EBUSY) { + return NETDEV_TX_BUSY; + } /* else fall through */ + +tx_drop: + card->stats.tx_dropped++; + card->stats.tx_errors++; + dev_kfree_skb_any(skb); + netif_wake_queue(dev); + return NETDEV_TX_OK; +} + +static int __qeth_l3_open(struct net_device *dev) +{ + struct qeth_card *card = dev->ml_priv; + int rc = 0; + + QETH_CARD_TEXT(card, 4, "qethopen"); + if (card->state == CARD_STATE_UP) + return rc; + if (card->state != CARD_STATE_SOFTSETUP) + return -ENODEV; + card->data.state = CH_STATE_UP; + card->state = CARD_STATE_UP; + netif_start_queue(dev); + + if (qdio_stop_irq(card->data.ccwdev, 0) >= 0) { + napi_enable(&card->napi); + local_bh_disable(); + napi_schedule(&card->napi); + /* kick-start the NAPI softirq: */ + local_bh_enable(); + } else + rc = -EIO; + return rc; +} + +static int qeth_l3_open(struct net_device *dev) +{ + struct qeth_card *card = dev->ml_priv; + + QETH_CARD_TEXT(card, 5, "qethope_"); + if (qeth_wait_for_threads(card, QETH_RECOVER_THREAD)) { + QETH_CARD_TEXT(card, 3, "openREC"); + return -ERESTARTSYS; + } + return __qeth_l3_open(dev); +} + +static int qeth_l3_stop(struct net_device *dev) +{ + struct qeth_card *card = dev->ml_priv; + + QETH_CARD_TEXT(card, 4, "qethstop"); + netif_tx_disable(dev); + if (card->state == CARD_STATE_UP) { + card->state = CARD_STATE_SOFTSETUP; + napi_disable(&card->napi); + } + return 0; +} + +static const struct ethtool_ops qeth_l3_ethtool_ops = { + .get_link = ethtool_op_get_link, + .get_strings = qeth_core_get_strings, + .get_ethtool_stats = qeth_core_get_ethtool_stats, + .get_sset_count = qeth_core_get_sset_count, + .get_drvinfo = qeth_core_get_drvinfo, + .get_link_ksettings = qeth_core_ethtool_get_link_ksettings, +}; + +/* + * we need NOARP for IPv4 but we want neighbor solicitation for IPv6. Setting + * NOARP on the netdevice is no option because it also turns off neighbor + * solicitation. For IPv4 we install a neighbor_setup function. We don't want + * arp resolution but we want the hard header (packet socket will work + * e.g. tcpdump) + */ +static int qeth_l3_neigh_setup_noarp(struct neighbour *n) +{ + n->nud_state = NUD_NOARP; + memcpy(n->ha, "FAKELL", 6); + n->output = n->ops->connected_output; + return 0; +} + +static int +qeth_l3_neigh_setup(struct net_device *dev, struct neigh_parms *np) +{ + if (np->tbl->family == AF_INET) + np->neigh_setup = qeth_l3_neigh_setup_noarp; + + return 0; +} + +static const struct net_device_ops qeth_l3_netdev_ops = { + .ndo_open = qeth_l3_open, + .ndo_stop = qeth_l3_stop, + .ndo_get_stats = qeth_get_stats, + .ndo_start_xmit = qeth_l3_hard_start_xmit, + .ndo_validate_addr = eth_validate_addr, + .ndo_set_rx_mode = qeth_l3_set_rx_mode, + .ndo_do_ioctl = qeth_do_ioctl, + .ndo_fix_features = qeth_fix_features, + .ndo_set_features = qeth_set_features, + .ndo_vlan_rx_add_vid = qeth_l3_vlan_rx_add_vid, + .ndo_vlan_rx_kill_vid = qeth_l3_vlan_rx_kill_vid, + .ndo_tx_timeout = qeth_tx_timeout, +}; + +static const struct net_device_ops qeth_l3_osa_netdev_ops = { + .ndo_open = qeth_l3_open, + .ndo_stop = qeth_l3_stop, + .ndo_get_stats = qeth_get_stats, + .ndo_start_xmit = qeth_l3_hard_start_xmit, + .ndo_features_check = qeth_features_check, + .ndo_validate_addr = eth_validate_addr, + .ndo_set_rx_mode = qeth_l3_set_rx_mode, + .ndo_do_ioctl = qeth_do_ioctl, + .ndo_fix_features = qeth_fix_features, + .ndo_set_features = qeth_set_features, + .ndo_vlan_rx_add_vid = qeth_l3_vlan_rx_add_vid, + .ndo_vlan_rx_kill_vid = qeth_l3_vlan_rx_kill_vid, + .ndo_tx_timeout = qeth_tx_timeout, + .ndo_neigh_setup = qeth_l3_neigh_setup, +}; + +static int qeth_l3_setup_netdev(struct qeth_card *card) +{ + int rc; + + if (qeth_netdev_is_registered(card->dev)) + return 0; + + if (card->info.type == QETH_CARD_TYPE_OSD || + card->info.type == QETH_CARD_TYPE_OSX) { + if ((card->info.link_type == QETH_LINK_TYPE_LANE_TR) || + (card->info.link_type == QETH_LINK_TYPE_HSTR)) { + pr_info("qeth_l3: ignoring TR device\n"); + return -ENODEV; + } + + card->dev->netdev_ops = &qeth_l3_osa_netdev_ops; + + /*IPv6 address autoconfiguration stuff*/ + qeth_l3_get_unique_id(card); + if (!(card->info.unique_id & UNIQUE_ID_NOT_BY_CARD)) + card->dev->dev_id = card->info.unique_id & 0xffff; + + if (!card->info.guestlan) { + card->dev->features |= NETIF_F_SG; + card->dev->hw_features |= NETIF_F_TSO | + NETIF_F_RXCSUM | NETIF_F_IP_CSUM; + card->dev->vlan_features |= NETIF_F_TSO | + NETIF_F_RXCSUM | NETIF_F_IP_CSUM; + } + + if (qeth_is_supported6(card, IPA_OUTBOUND_CHECKSUM_V6)) { + card->dev->hw_features |= NETIF_F_IPV6_CSUM; + card->dev->vlan_features |= NETIF_F_IPV6_CSUM; + } + } else if (card->info.type == QETH_CARD_TYPE_IQD) { + card->dev->flags |= IFF_NOARP; + card->dev->netdev_ops = &qeth_l3_netdev_ops; + + rc = qeth_l3_iqd_read_initial_mac(card); + if (rc) + goto out; + + if (card->options.hsuid[0]) + memcpy(card->dev->perm_addr, card->options.hsuid, 9); + } else + return -ENODEV; + + card->dev->ethtool_ops = &qeth_l3_ethtool_ops; + card->dev->needed_headroom = sizeof(struct qeth_hdr) - ETH_HLEN; + card->dev->features |= NETIF_F_HW_VLAN_CTAG_TX | + NETIF_F_HW_VLAN_CTAG_RX | + NETIF_F_HW_VLAN_CTAG_FILTER; + + netif_keep_dst(card->dev); + if (card->dev->hw_features & NETIF_F_TSO) + netif_set_gso_max_size(card->dev, + PAGE_SIZE * (QETH_MAX_BUFFER_ELEMENTS(card) - 1)); + + netif_napi_add(card->dev, &card->napi, qeth_poll, QETH_NAPI_WEIGHT); + rc = register_netdev(card->dev); +out: + if (rc) + card->dev->netdev_ops = NULL; + return rc; +} + +static const struct device_type qeth_l3_devtype = { + .name = "qeth_layer3", + .groups = qeth_l3_attr_groups, +}; + +static int qeth_l3_probe_device(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + int rc; + + hash_init(card->ip_htable); + + if (gdev->dev.type == &qeth_generic_devtype) { + rc = qeth_l3_create_device_attributes(&gdev->dev); + if (rc) + return rc; + } + + hash_init(card->ip_mc_htable); + card->options.layer2 = 0; + card->info.hwtrap = 0; + return 0; +} + +static void qeth_l3_remove_device(struct ccwgroup_device *cgdev) +{ + struct qeth_card *card = dev_get_drvdata(&cgdev->dev); + + if (cgdev->dev.type == &qeth_generic_devtype) + qeth_l3_remove_device_attributes(&cgdev->dev); + + qeth_set_allowed_threads(card, 0, 1); + wait_event(card->wait_q, qeth_threads_running(card, 0xffffffff) == 0); + + if (cgdev->state == CCWGROUP_ONLINE) + qeth_l3_set_offline(cgdev); + + cancel_work_sync(&card->close_dev_work); + if (qeth_netdev_is_registered(card->dev)) + unregister_netdev(card->dev); + qeth_l3_clear_ip_htable(card, 0); + qeth_l3_clear_ipato_list(card); +} + +static int __qeth_l3_set_online(struct ccwgroup_device *gdev, int recovery_mode) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + int rc = 0; + enum qeth_card_states recover_flag; + + mutex_lock(&card->discipline_mutex); + mutex_lock(&card->conf_mutex); + QETH_DBF_TEXT(SETUP, 2, "setonlin"); + QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *)); + + recover_flag = card->state; + rc = qeth_core_hardsetup_card(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "2err%04x", rc); + rc = -ENODEV; + goto out_remove; + } + + rc = qeth_l3_setup_netdev(card); + if (rc) + goto out_remove; + + if (qeth_is_diagass_supported(card, QETH_DIAGS_CMD_TRAP)) { + if (card->info.hwtrap && + qeth_hw_trap(card, QETH_DIAGS_TRAP_ARM)) + card->info.hwtrap = 0; + } else + card->info.hwtrap = 0; + + card->state = CARD_STATE_HARDSETUP; + qeth_print_status_message(card); + + /* softsetup */ + QETH_DBF_TEXT(SETUP, 2, "softsetp"); + + rc = qeth_l3_setadapter_parms(card); + if (rc) + QETH_DBF_TEXT_(SETUP, 2, "2err%04x", rc); + if (!card->options.sniffer) { + rc = qeth_l3_start_ipassists(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "3err%d", rc); + goto out_remove; + } + rc = qeth_l3_setrouting_v4(card); + if (rc) + QETH_DBF_TEXT_(SETUP, 2, "4err%04x", rc); + rc = qeth_l3_setrouting_v6(card); + if (rc) + QETH_DBF_TEXT_(SETUP, 2, "5err%04x", rc); + } + netif_tx_disable(card->dev); + + rc = qeth_init_qdio_queues(card); + if (rc) { + QETH_DBF_TEXT_(SETUP, 2, "6err%d", rc); + rc = -ENODEV; + goto out_remove; + } + card->state = CARD_STATE_SOFTSETUP; + + qeth_set_allowed_threads(card, 0xffffffff, 0); + qeth_l3_recover_ip(card); + if (card->lan_online) + netif_carrier_on(card->dev); + else + netif_carrier_off(card->dev); + + qeth_enable_hw_features(card->dev); + if (recover_flag == CARD_STATE_RECOVER) { + rtnl_lock(); + if (recovery_mode) { + __qeth_l3_open(card->dev); + qeth_l3_set_rx_mode(card->dev); + } else { + dev_open(card->dev); + } + rtnl_unlock(); + } + qeth_trace_features(card); + /* let user_space know that device is online */ + kobject_uevent(&gdev->dev.kobj, KOBJ_CHANGE); + mutex_unlock(&card->conf_mutex); + mutex_unlock(&card->discipline_mutex); + return 0; +out_remove: + qeth_l3_stop_card(card, 0); + ccw_device_set_offline(CARD_DDEV(card)); + ccw_device_set_offline(CARD_WDEV(card)); + ccw_device_set_offline(CARD_RDEV(card)); + qdio_free(CARD_DDEV(card)); + if (recover_flag == CARD_STATE_RECOVER) + card->state = CARD_STATE_RECOVER; + else + card->state = CARD_STATE_DOWN; + mutex_unlock(&card->conf_mutex); + mutex_unlock(&card->discipline_mutex); + return rc; +} + +static int qeth_l3_set_online(struct ccwgroup_device *gdev) +{ + return __qeth_l3_set_online(gdev, 0); +} + +static int __qeth_l3_set_offline(struct ccwgroup_device *cgdev, + int recovery_mode) +{ + struct qeth_card *card = dev_get_drvdata(&cgdev->dev); + int rc = 0, rc2 = 0, rc3 = 0; + enum qeth_card_states recover_flag; + + mutex_lock(&card->discipline_mutex); + mutex_lock(&card->conf_mutex); + QETH_DBF_TEXT(SETUP, 3, "setoffl"); + QETH_DBF_HEX(SETUP, 3, &card, sizeof(void *)); + + netif_carrier_off(card->dev); + recover_flag = card->state; + if ((!recovery_mode && card->info.hwtrap) || card->info.hwtrap == 2) { + qeth_hw_trap(card, QETH_DIAGS_TRAP_DISARM); + card->info.hwtrap = 1; + } + qeth_l3_stop_card(card, recovery_mode); + if ((card->options.cq == QETH_CQ_ENABLED) && card->dev) { + rtnl_lock(); + call_netdevice_notifiers(NETDEV_REBOOT, card->dev); + rtnl_unlock(); + } + rc = ccw_device_set_offline(CARD_DDEV(card)); + rc2 = ccw_device_set_offline(CARD_WDEV(card)); + rc3 = ccw_device_set_offline(CARD_RDEV(card)); + if (!rc) + rc = (rc2) ? rc2 : rc3; + if (rc) + QETH_DBF_TEXT_(SETUP, 2, "1err%d", rc); + qdio_free(CARD_DDEV(card)); + if (recover_flag == CARD_STATE_UP) + card->state = CARD_STATE_RECOVER; + /* let user_space know that device is offline */ + kobject_uevent(&cgdev->dev.kobj, KOBJ_CHANGE); + mutex_unlock(&card->conf_mutex); + mutex_unlock(&card->discipline_mutex); + return 0; +} + +static int qeth_l3_set_offline(struct ccwgroup_device *cgdev) +{ + return __qeth_l3_set_offline(cgdev, 0); +} + +static int qeth_l3_recover(void *ptr) +{ + struct qeth_card *card; + int rc = 0; + + card = (struct qeth_card *) ptr; + QETH_CARD_TEXT(card, 2, "recover1"); + QETH_CARD_HEX(card, 2, &card, sizeof(void *)); + if (!qeth_do_run_thread(card, QETH_RECOVER_THREAD)) + return 0; + QETH_CARD_TEXT(card, 2, "recover2"); + dev_warn(&card->gdev->dev, + "A recovery process has been started for the device\n"); + qeth_set_recovery_task(card); + __qeth_l3_set_offline(card->gdev, 1); + rc = __qeth_l3_set_online(card->gdev, 1); + if (!rc) + dev_info(&card->gdev->dev, + "Device successfully recovered!\n"); + else { + qeth_close_dev(card); + dev_warn(&card->gdev->dev, "The qeth device driver " + "failed to recover an error on the device\n"); + } + qeth_clear_recovery_task(card); + qeth_clear_thread_start_bit(card, QETH_RECOVER_THREAD); + qeth_clear_thread_running_bit(card, QETH_RECOVER_THREAD); + return 0; +} + +static int qeth_l3_pm_suspend(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + + netif_device_detach(card->dev); + qeth_set_allowed_threads(card, 0, 1); + wait_event(card->wait_q, qeth_threads_running(card, 0xffffffff) == 0); + if (gdev->state == CCWGROUP_OFFLINE) + return 0; + if (card->state == CARD_STATE_UP) { + if (card->info.hwtrap) + qeth_hw_trap(card, QETH_DIAGS_TRAP_DISARM); + __qeth_l3_set_offline(card->gdev, 1); + } else + __qeth_l3_set_offline(card->gdev, 0); + return 0; +} + +static int qeth_l3_pm_resume(struct ccwgroup_device *gdev) +{ + struct qeth_card *card = dev_get_drvdata(&gdev->dev); + int rc = 0; + + if (gdev->state == CCWGROUP_OFFLINE) + goto out; + + if (card->state == CARD_STATE_RECOVER) { + rc = __qeth_l3_set_online(card->gdev, 1); + if (rc) { + rtnl_lock(); + dev_close(card->dev); + rtnl_unlock(); + } + } else + rc = __qeth_l3_set_online(card->gdev, 0); +out: + qeth_set_allowed_threads(card, 0xffffffff, 0); + netif_device_attach(card->dev); + if (rc) + dev_warn(&card->gdev->dev, "The qeth device driver " + "failed to recover an error on the device\n"); + return rc; +} + +/* Returns zero if the command is successfully "consumed" */ +static int qeth_l3_control_event(struct qeth_card *card, + struct qeth_ipa_cmd *cmd) +{ + return 1; +} + +struct qeth_discipline qeth_l3_discipline = { + .devtype = &qeth_l3_devtype, + .process_rx_buffer = qeth_l3_process_inbound_buffer, + .recover = qeth_l3_recover, + .setup = qeth_l3_probe_device, + .remove = qeth_l3_remove_device, + .set_online = qeth_l3_set_online, + .set_offline = qeth_l3_set_offline, + .freeze = qeth_l3_pm_suspend, + .thaw = qeth_l3_pm_resume, + .restore = qeth_l3_pm_resume, + .do_ioctl = qeth_l3_do_ioctl, + .control_event_handler = qeth_l3_control_event, +}; +EXPORT_SYMBOL_GPL(qeth_l3_discipline); + +static int qeth_l3_handle_ip_event(struct qeth_card *card, + struct qeth_ipaddr *addr, + unsigned long event) +{ + switch (event) { + case NETDEV_UP: + spin_lock_bh(&card->ip_lock); + qeth_l3_add_ip(card, addr); + spin_unlock_bh(&card->ip_lock); + return NOTIFY_OK; + case NETDEV_DOWN: + spin_lock_bh(&card->ip_lock); + qeth_l3_delete_ip(card, addr); + spin_unlock_bh(&card->ip_lock); + return NOTIFY_OK; + default: + return NOTIFY_DONE; + } +} + +static struct qeth_card *qeth_l3_get_card_from_dev(struct net_device *dev) +{ + if (is_vlan_dev(dev)) + dev = vlan_dev_real_dev(dev); + if (dev->netdev_ops == &qeth_l3_osa_netdev_ops || + dev->netdev_ops == &qeth_l3_netdev_ops) + return (struct qeth_card *) dev->ml_priv; + return NULL; +} + +static int qeth_l3_ip_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + + struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; + struct net_device *dev = ifa->ifa_dev->dev; + struct qeth_ipaddr addr; + struct qeth_card *card; + + if (dev_net(dev) != &init_net) + return NOTIFY_DONE; + + card = qeth_l3_get_card_from_dev(dev); + if (!card) + return NOTIFY_DONE; + QETH_CARD_TEXT(card, 3, "ipevent"); + + qeth_l3_init_ipaddr(&addr, QETH_IP_TYPE_NORMAL, QETH_PROT_IPV4); + addr.u.a4.addr = be32_to_cpu(ifa->ifa_address); + addr.u.a4.mask = be32_to_cpu(ifa->ifa_mask); + + return qeth_l3_handle_ip_event(card, &addr, event); +} + +static struct notifier_block qeth_l3_ip_notifier = { + qeth_l3_ip_event, + NULL, +}; + +static int qeth_l3_ip6_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; + struct net_device *dev = ifa->idev->dev; + struct qeth_ipaddr addr; + struct qeth_card *card; + + card = qeth_l3_get_card_from_dev(dev); + if (!card) + return NOTIFY_DONE; + QETH_CARD_TEXT(card, 3, "ip6event"); + if (!qeth_is_supported(card, IPA_IPV6)) + return NOTIFY_DONE; + + qeth_l3_init_ipaddr(&addr, QETH_IP_TYPE_NORMAL, QETH_PROT_IPV6); + addr.u.a6.addr = ifa->addr; + addr.u.a6.pfxlen = ifa->prefix_len; + + return qeth_l3_handle_ip_event(card, &addr, event); +} + +static struct notifier_block qeth_l3_ip6_notifier = { + qeth_l3_ip6_event, + NULL, +}; + +static int qeth_l3_register_notifiers(void) +{ + int rc; + + QETH_DBF_TEXT(SETUP, 5, "regnotif"); + rc = register_inetaddr_notifier(&qeth_l3_ip_notifier); + if (rc) + return rc; + rc = register_inet6addr_notifier(&qeth_l3_ip6_notifier); + if (rc) { + unregister_inetaddr_notifier(&qeth_l3_ip_notifier); + return rc; + } + return 0; +} + +static void qeth_l3_unregister_notifiers(void) +{ + QETH_DBF_TEXT(SETUP, 5, "unregnot"); + WARN_ON(unregister_inetaddr_notifier(&qeth_l3_ip_notifier)); + WARN_ON(unregister_inet6addr_notifier(&qeth_l3_ip6_notifier)); +} + +static int __init qeth_l3_init(void) +{ + pr_info("register layer 3 discipline\n"); + return qeth_l3_register_notifiers(); +} + +static void __exit qeth_l3_exit(void) +{ + qeth_l3_unregister_notifiers(); + pr_info("unregister layer 3 discipline\n"); +} + +module_init(qeth_l3_init); +module_exit(qeth_l3_exit); +MODULE_AUTHOR("Frank Blaschka "); +MODULE_DESCRIPTION("qeth layer 3 discipline"); +MODULE_LICENSE("GPL"); diff --git a/drivers/s390/net/qeth_l3_sys.c b/drivers/s390/net/qeth_l3_sys.c new file mode 100644 index 000000000..45ac6d870 --- /dev/null +++ b/drivers/s390/net/qeth_l3_sys.c @@ -0,0 +1,1007 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2007 + * Author(s): Utz Bacher , + * Frank Pavlic , + * Thomas Spatzier , + * Frank Blaschka + */ + +#include +#include +#include +#include +#include "qeth_l3.h" + +#define QETH_DEVICE_ATTR(_id, _name, _mode, _show, _store) \ +struct device_attribute dev_attr_##_id = __ATTR(_name, _mode, _show, _store) + +static int qeth_l3_string_to_ipaddr(const char *buf, + enum qeth_prot_versions proto, u8 *addr) +{ + const char *end; + + if ((proto == QETH_PROT_IPV4 && !in4_pton(buf, -1, addr, -1, &end)) || + (proto == QETH_PROT_IPV6 && !in6_pton(buf, -1, addr, -1, &end))) + return -EINVAL; + return 0; +} + +static ssize_t qeth_l3_dev_route_show(struct qeth_card *card, + struct qeth_routing_info *route, char *buf) +{ + switch (route->type) { + case PRIMARY_ROUTER: + return sprintf(buf, "%s\n", "primary router"); + case SECONDARY_ROUTER: + return sprintf(buf, "%s\n", "secondary router"); + case MULTICAST_ROUTER: + if (card->info.broadcast_capable == QETH_BROADCAST_WITHOUT_ECHO) + return sprintf(buf, "%s\n", "multicast router+"); + else + return sprintf(buf, "%s\n", "multicast router"); + case PRIMARY_CONNECTOR: + if (card->info.broadcast_capable == QETH_BROADCAST_WITHOUT_ECHO) + return sprintf(buf, "%s\n", "primary connector+"); + else + return sprintf(buf, "%s\n", "primary connector"); + case SECONDARY_CONNECTOR: + if (card->info.broadcast_capable == QETH_BROADCAST_WITHOUT_ECHO) + return sprintf(buf, "%s\n", "secondary connector+"); + else + return sprintf(buf, "%s\n", "secondary connector"); + default: + return sprintf(buf, "%s\n", "no"); + } +} + +static ssize_t qeth_l3_dev_route4_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_route_show(card, &card->options.route4, buf); +} + +static ssize_t qeth_l3_dev_route_store(struct qeth_card *card, + struct qeth_routing_info *route, enum qeth_prot_versions prot, + const char *buf, size_t count) +{ + enum qeth_routing_types old_route_type = route->type; + int rc = 0; + + mutex_lock(&card->conf_mutex); + if (sysfs_streq(buf, "no_router")) { + route->type = NO_ROUTER; + } else if (sysfs_streq(buf, "primary_connector")) { + route->type = PRIMARY_CONNECTOR; + } else if (sysfs_streq(buf, "secondary_connector")) { + route->type = SECONDARY_CONNECTOR; + } else if (sysfs_streq(buf, "primary_router")) { + route->type = PRIMARY_ROUTER; + } else if (sysfs_streq(buf, "secondary_router")) { + route->type = SECONDARY_ROUTER; + } else if (sysfs_streq(buf, "multicast_router")) { + route->type = MULTICAST_ROUTER; + } else { + rc = -EINVAL; + goto out; + } + if (qeth_card_hw_is_reachable(card) && + (old_route_type != route->type)) { + if (prot == QETH_PROT_IPV4) + rc = qeth_l3_setrouting_v4(card); + else if (prot == QETH_PROT_IPV6) + rc = qeth_l3_setrouting_v6(card); + } +out: + if (rc) + route->type = old_route_type; + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static ssize_t qeth_l3_dev_route4_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_route_store(card, &card->options.route4, + QETH_PROT_IPV4, buf, count); +} + +static DEVICE_ATTR(route4, 0644, qeth_l3_dev_route4_show, + qeth_l3_dev_route4_store); + +static ssize_t qeth_l3_dev_route6_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_route_show(card, &card->options.route6, buf); +} + +static ssize_t qeth_l3_dev_route6_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_route_store(card, &card->options.route6, + QETH_PROT_IPV6, buf, count); +} + +static DEVICE_ATTR(route6, 0644, qeth_l3_dev_route6_show, + qeth_l3_dev_route6_store); + +static ssize_t qeth_l3_dev_fake_broadcast_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return sprintf(buf, "%i\n", card->options.fake_broadcast? 1:0); +} + +static ssize_t qeth_l3_dev_fake_broadcast_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + char *tmp; + int i, rc = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + if ((card->state != CARD_STATE_DOWN) && + (card->state != CARD_STATE_RECOVER)) { + rc = -EPERM; + goto out; + } + + i = simple_strtoul(buf, &tmp, 16); + if ((i == 0) || (i == 1)) + card->options.fake_broadcast = i; + else + rc = -EINVAL; +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static DEVICE_ATTR(fake_broadcast, 0644, qeth_l3_dev_fake_broadcast_show, + qeth_l3_dev_fake_broadcast_store); + +static ssize_t qeth_l3_dev_sniffer_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return sprintf(buf, "%i\n", card->options.sniffer ? 1 : 0); +} + +static ssize_t qeth_l3_dev_sniffer_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + int rc = 0; + unsigned long i; + + if (!card) + return -EINVAL; + + if (card->info.type != QETH_CARD_TYPE_IQD) + return -EPERM; + if (card->options.cq == QETH_CQ_ENABLED) + return -EPERM; + + mutex_lock(&card->conf_mutex); + if ((card->state != CARD_STATE_DOWN) && + (card->state != CARD_STATE_RECOVER)) { + rc = -EPERM; + goto out; + } + + rc = kstrtoul(buf, 16, &i); + if (rc) { + rc = -EINVAL; + goto out; + } + switch (i) { + case 0: + card->options.sniffer = i; + break; + case 1: + qdio_get_ssqd_desc(CARD_DDEV(card), &card->ssqd); + if (card->ssqd.qdioac2 & QETH_SNIFF_AVAIL) { + card->options.sniffer = i; + if (card->qdio.init_pool.buf_count != + QETH_IN_BUF_COUNT_MAX) + qeth_realloc_buffer_pool(card, + QETH_IN_BUF_COUNT_MAX); + } else + rc = -EPERM; + break; + default: + rc = -EINVAL; + } +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static DEVICE_ATTR(sniffer, 0644, qeth_l3_dev_sniffer_show, + qeth_l3_dev_sniffer_store); + + +static ssize_t qeth_l3_dev_hsuid_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + char tmp_hsuid[9]; + + if (!card) + return -EINVAL; + + if (card->info.type != QETH_CARD_TYPE_IQD) + return -EPERM; + + memcpy(tmp_hsuid, card->options.hsuid, sizeof(tmp_hsuid)); + EBCASC(tmp_hsuid, 8); + return sprintf(buf, "%s\n", tmp_hsuid); +} + +static ssize_t qeth_l3_dev_hsuid_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + char *tmp; + int rc; + + if (!card) + return -EINVAL; + + if (card->info.type != QETH_CARD_TYPE_IQD) + return -EPERM; + if (card->state != CARD_STATE_DOWN && + card->state != CARD_STATE_RECOVER) + return -EPERM; + if (card->options.sniffer) + return -EPERM; + if (card->options.cq == QETH_CQ_NOTAVAILABLE) + return -EPERM; + + tmp = strsep((char **)&buf, "\n"); + if (strlen(tmp) > 8) + return -EINVAL; + + if (card->options.hsuid[0]) + /* delete old ip address */ + qeth_l3_modify_hsuid(card, false); + + if (strlen(tmp) == 0) { + /* delete ip address only */ + card->options.hsuid[0] = '\0'; + memcpy(card->dev->perm_addr, card->options.hsuid, 9); + qeth_configure_cq(card, QETH_CQ_DISABLED); + return count; + } + + if (qeth_configure_cq(card, QETH_CQ_ENABLED)) + return -EPERM; + + snprintf(card->options.hsuid, sizeof(card->options.hsuid), + "%-8s", tmp); + ASCEBC(card->options.hsuid, 8); + memcpy(card->dev->perm_addr, card->options.hsuid, 9); + + rc = qeth_l3_modify_hsuid(card, true); + + return rc ? rc : count; +} + +static DEVICE_ATTR(hsuid, 0644, qeth_l3_dev_hsuid_show, + qeth_l3_dev_hsuid_store); + + +static struct attribute *qeth_l3_device_attrs[] = { + &dev_attr_route4.attr, + &dev_attr_route6.attr, + &dev_attr_fake_broadcast.attr, + &dev_attr_sniffer.attr, + &dev_attr_hsuid.attr, + NULL, +}; + +static const struct attribute_group qeth_l3_device_attr_group = { + .attrs = qeth_l3_device_attrs, +}; + +static ssize_t qeth_l3_dev_ipato_enable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return sprintf(buf, "%i\n", card->ipato.enabled? 1:0); +} + +static ssize_t qeth_l3_dev_ipato_enable_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + bool enable; + int rc = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + if ((card->state != CARD_STATE_DOWN) && + (card->state != CARD_STATE_RECOVER)) { + rc = -EPERM; + goto out; + } + + if (sysfs_streq(buf, "toggle")) { + enable = !card->ipato.enabled; + } else if (kstrtobool(buf, &enable)) { + rc = -EINVAL; + goto out; + } + + if (card->ipato.enabled != enable) { + card->ipato.enabled = enable; + spin_lock_bh(&card->ip_lock); + qeth_l3_update_ipato(card); + spin_unlock_bh(&card->ip_lock); + } +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static QETH_DEVICE_ATTR(ipato_enable, enable, 0644, + qeth_l3_dev_ipato_enable_show, + qeth_l3_dev_ipato_enable_store); + +static ssize_t qeth_l3_dev_ipato_invert4_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return sprintf(buf, "%i\n", card->ipato.invert4? 1:0); +} + +static ssize_t qeth_l3_dev_ipato_invert4_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + bool invert; + int rc = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + if (sysfs_streq(buf, "toggle")) { + invert = !card->ipato.invert4; + } else if (kstrtobool(buf, &invert)) { + rc = -EINVAL; + goto out; + } + + if (card->ipato.invert4 != invert) { + card->ipato.invert4 = invert; + spin_lock_bh(&card->ip_lock); + qeth_l3_update_ipato(card); + spin_unlock_bh(&card->ip_lock); + } +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static QETH_DEVICE_ATTR(ipato_invert4, invert4, 0644, + qeth_l3_dev_ipato_invert4_show, + qeth_l3_dev_ipato_invert4_store); + +static ssize_t qeth_l3_dev_ipato_add_show(char *buf, struct qeth_card *card, + enum qeth_prot_versions proto) +{ + struct qeth_ipato_entry *ipatoe; + char addr_str[40]; + int entry_len; /* length of 1 entry string, differs between v4 and v6 */ + int i = 0; + + entry_len = (proto == QETH_PROT_IPV4)? 12 : 40; + /* add strlen for "/\n" */ + entry_len += (proto == QETH_PROT_IPV4)? 5 : 6; + spin_lock_bh(&card->ip_lock); + list_for_each_entry(ipatoe, &card->ipato.entries, entry) { + if (ipatoe->proto != proto) + continue; + /* String must not be longer than PAGE_SIZE. So we check if + * string length gets near PAGE_SIZE. Then we can savely display + * the next IPv6 address (worst case, compared to IPv4) */ + if ((PAGE_SIZE - i) <= entry_len) + break; + qeth_l3_ipaddr_to_string(proto, ipatoe->addr, addr_str); + i += snprintf(buf + i, PAGE_SIZE - i, + "%s/%i\n", addr_str, ipatoe->mask_bits); + } + spin_unlock_bh(&card->ip_lock); + i += snprintf(buf + i, PAGE_SIZE - i, "\n"); + + return i; +} + +static ssize_t qeth_l3_dev_ipato_add4_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_ipato_add_show(buf, card, QETH_PROT_IPV4); +} + +static int qeth_l3_parse_ipatoe(const char *buf, enum qeth_prot_versions proto, + u8 *addr, int *mask_bits) +{ + const char *start, *end; + char *tmp; + char buffer[40] = {0, }; + + start = buf; + /* get address string */ + end = strchr(start, '/'); + if (!end || (end - start >= 40)) { + return -EINVAL; + } + strncpy(buffer, start, end - start); + if (qeth_l3_string_to_ipaddr(buffer, proto, addr)) { + return -EINVAL; + } + start = end + 1; + *mask_bits = simple_strtoul(start, &tmp, 10); + if (!strlen(start) || + (tmp == start) || + (*mask_bits > ((proto == QETH_PROT_IPV4) ? 32 : 128))) { + return -EINVAL; + } + return 0; +} + +static ssize_t qeth_l3_dev_ipato_add_store(const char *buf, size_t count, + struct qeth_card *card, enum qeth_prot_versions proto) +{ + struct qeth_ipato_entry *ipatoe; + u8 addr[16]; + int mask_bits; + int rc = 0; + + mutex_lock(&card->conf_mutex); + rc = qeth_l3_parse_ipatoe(buf, proto, addr, &mask_bits); + if (rc) + goto out; + + ipatoe = kzalloc(sizeof(struct qeth_ipato_entry), GFP_KERNEL); + if (!ipatoe) { + rc = -ENOMEM; + goto out; + } + ipatoe->proto = proto; + memcpy(ipatoe->addr, addr, (proto == QETH_PROT_IPV4)? 4:16); + ipatoe->mask_bits = mask_bits; + + rc = qeth_l3_add_ipato_entry(card, ipatoe); + if (rc) + kfree(ipatoe); +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static ssize_t qeth_l3_dev_ipato_add4_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_ipato_add_store(buf, count, card, QETH_PROT_IPV4); +} + +static QETH_DEVICE_ATTR(ipato_add4, add4, 0644, + qeth_l3_dev_ipato_add4_show, + qeth_l3_dev_ipato_add4_store); + +static ssize_t qeth_l3_dev_ipato_del_store(const char *buf, size_t count, + struct qeth_card *card, enum qeth_prot_versions proto) +{ + u8 addr[16]; + int mask_bits; + int rc = 0; + + mutex_lock(&card->conf_mutex); + rc = qeth_l3_parse_ipatoe(buf, proto, addr, &mask_bits); + if (!rc) + rc = qeth_l3_del_ipato_entry(card, proto, addr, mask_bits); + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static ssize_t qeth_l3_dev_ipato_del4_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_ipato_del_store(buf, count, card, QETH_PROT_IPV4); +} + +static QETH_DEVICE_ATTR(ipato_del4, del4, 0200, NULL, + qeth_l3_dev_ipato_del4_store); + +static ssize_t qeth_l3_dev_ipato_invert6_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return sprintf(buf, "%i\n", card->ipato.invert6? 1:0); +} + +static ssize_t qeth_l3_dev_ipato_invert6_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + bool invert; + int rc = 0; + + if (!card) + return -EINVAL; + + mutex_lock(&card->conf_mutex); + if (sysfs_streq(buf, "toggle")) { + invert = !card->ipato.invert6; + } else if (kstrtobool(buf, &invert)) { + rc = -EINVAL; + goto out; + } + + if (card->ipato.invert6 != invert) { + card->ipato.invert6 = invert; + spin_lock_bh(&card->ip_lock); + qeth_l3_update_ipato(card); + spin_unlock_bh(&card->ip_lock); + } +out: + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static QETH_DEVICE_ATTR(ipato_invert6, invert6, 0644, + qeth_l3_dev_ipato_invert6_show, + qeth_l3_dev_ipato_invert6_store); + + +static ssize_t qeth_l3_dev_ipato_add6_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_ipato_add_show(buf, card, QETH_PROT_IPV6); +} + +static ssize_t qeth_l3_dev_ipato_add6_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_ipato_add_store(buf, count, card, QETH_PROT_IPV6); +} + +static QETH_DEVICE_ATTR(ipato_add6, add6, 0644, + qeth_l3_dev_ipato_add6_show, + qeth_l3_dev_ipato_add6_store); + +static ssize_t qeth_l3_dev_ipato_del6_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_ipato_del_store(buf, count, card, QETH_PROT_IPV6); +} + +static QETH_DEVICE_ATTR(ipato_del6, del6, 0200, NULL, + qeth_l3_dev_ipato_del6_store); + +static struct attribute *qeth_ipato_device_attrs[] = { + &dev_attr_ipato_enable.attr, + &dev_attr_ipato_invert4.attr, + &dev_attr_ipato_add4.attr, + &dev_attr_ipato_del4.attr, + &dev_attr_ipato_invert6.attr, + &dev_attr_ipato_add6.attr, + &dev_attr_ipato_del6.attr, + NULL, +}; + +static const struct attribute_group qeth_device_ipato_group = { + .name = "ipa_takeover", + .attrs = qeth_ipato_device_attrs, +}; + +static ssize_t qeth_l3_dev_ip_add_show(struct device *dev, char *buf, + enum qeth_prot_versions proto, + enum qeth_ip_types type) +{ + struct qeth_card *card = dev_get_drvdata(dev); + struct qeth_ipaddr *ipaddr; + char addr_str[40]; + int str_len = 0; + int entry_len; /* length of 1 entry string, differs between v4 and v6 */ + int i; + + if (!card) + return -EINVAL; + + entry_len = (proto == QETH_PROT_IPV4)? 12 : 40; + entry_len += 2; /* \n + terminator */ + spin_lock_bh(&card->ip_lock); + hash_for_each(card->ip_htable, i, ipaddr, hnode) { + if (ipaddr->proto != proto || ipaddr->type != type) + continue; + /* String must not be longer than PAGE_SIZE. So we check if + * string length gets near PAGE_SIZE. Then we can savely display + * the next IPv6 address (worst case, compared to IPv4) */ + if ((PAGE_SIZE - str_len) <= entry_len) + break; + qeth_l3_ipaddr_to_string(proto, (const u8 *)&ipaddr->u, + addr_str); + str_len += snprintf(buf + str_len, PAGE_SIZE - str_len, "%s\n", + addr_str); + } + spin_unlock_bh(&card->ip_lock); + str_len += snprintf(buf + str_len, PAGE_SIZE - str_len, "\n"); + + return str_len; +} + +static ssize_t qeth_l3_dev_vipa_add4_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return qeth_l3_dev_ip_add_show(dev, buf, QETH_PROT_IPV4, + QETH_IP_TYPE_VIPA); +} + +static int qeth_l3_parse_vipae(const char *buf, enum qeth_prot_versions proto, + u8 *addr) +{ + if (qeth_l3_string_to_ipaddr(buf, proto, addr)) { + return -EINVAL; + } + return 0; +} + +static ssize_t qeth_l3_dev_vipa_add_store(const char *buf, size_t count, + struct qeth_card *card, enum qeth_prot_versions proto) +{ + u8 addr[16] = {0, }; + int rc; + + mutex_lock(&card->conf_mutex); + rc = qeth_l3_parse_vipae(buf, proto, addr); + if (!rc) + rc = qeth_l3_modify_rxip_vipa(card, true, addr, + QETH_IP_TYPE_VIPA, proto); + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static ssize_t qeth_l3_dev_vipa_add4_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_vipa_add_store(buf, count, card, QETH_PROT_IPV4); +} + +static QETH_DEVICE_ATTR(vipa_add4, add4, 0644, + qeth_l3_dev_vipa_add4_show, + qeth_l3_dev_vipa_add4_store); + +static ssize_t qeth_l3_dev_vipa_del_store(const char *buf, size_t count, + struct qeth_card *card, enum qeth_prot_versions proto) +{ + u8 addr[16]; + int rc; + + mutex_lock(&card->conf_mutex); + rc = qeth_l3_parse_vipae(buf, proto, addr); + if (!rc) + rc = qeth_l3_modify_rxip_vipa(card, false, addr, + QETH_IP_TYPE_VIPA, proto); + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static ssize_t qeth_l3_dev_vipa_del4_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_vipa_del_store(buf, count, card, QETH_PROT_IPV4); +} + +static QETH_DEVICE_ATTR(vipa_del4, del4, 0200, NULL, + qeth_l3_dev_vipa_del4_store); + +static ssize_t qeth_l3_dev_vipa_add6_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return qeth_l3_dev_ip_add_show(dev, buf, QETH_PROT_IPV6, + QETH_IP_TYPE_VIPA); +} + +static ssize_t qeth_l3_dev_vipa_add6_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_vipa_add_store(buf, count, card, QETH_PROT_IPV6); +} + +static QETH_DEVICE_ATTR(vipa_add6, add6, 0644, + qeth_l3_dev_vipa_add6_show, + qeth_l3_dev_vipa_add6_store); + +static ssize_t qeth_l3_dev_vipa_del6_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_vipa_del_store(buf, count, card, QETH_PROT_IPV6); +} + +static QETH_DEVICE_ATTR(vipa_del6, del6, 0200, NULL, + qeth_l3_dev_vipa_del6_store); + +static struct attribute *qeth_vipa_device_attrs[] = { + &dev_attr_vipa_add4.attr, + &dev_attr_vipa_del4.attr, + &dev_attr_vipa_add6.attr, + &dev_attr_vipa_del6.attr, + NULL, +}; + +static const struct attribute_group qeth_device_vipa_group = { + .name = "vipa", + .attrs = qeth_vipa_device_attrs, +}; + +static ssize_t qeth_l3_dev_rxip_add4_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return qeth_l3_dev_ip_add_show(dev, buf, QETH_PROT_IPV4, + QETH_IP_TYPE_RXIP); +} + +static int qeth_l3_parse_rxipe(const char *buf, enum qeth_prot_versions proto, + u8 *addr) +{ + __be32 ipv4_addr; + struct in6_addr ipv6_addr; + + if (qeth_l3_string_to_ipaddr(buf, proto, addr)) { + return -EINVAL; + } + if (proto == QETH_PROT_IPV4) { + memcpy(&ipv4_addr, addr, sizeof(ipv4_addr)); + if (ipv4_is_multicast(ipv4_addr)) { + QETH_DBF_MESSAGE(2, "multicast rxip not supported.\n"); + return -EINVAL; + } + } else if (proto == QETH_PROT_IPV6) { + memcpy(&ipv6_addr, addr, sizeof(ipv6_addr)); + if (ipv6_addr_is_multicast(&ipv6_addr)) { + QETH_DBF_MESSAGE(2, "multicast rxip not supported.\n"); + return -EINVAL; + } + } + + return 0; +} + +static ssize_t qeth_l3_dev_rxip_add_store(const char *buf, size_t count, + struct qeth_card *card, enum qeth_prot_versions proto) +{ + u8 addr[16] = {0, }; + int rc; + + mutex_lock(&card->conf_mutex); + rc = qeth_l3_parse_rxipe(buf, proto, addr); + if (!rc) + rc = qeth_l3_modify_rxip_vipa(card, true, addr, + QETH_IP_TYPE_RXIP, proto); + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static ssize_t qeth_l3_dev_rxip_add4_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_rxip_add_store(buf, count, card, QETH_PROT_IPV4); +} + +static QETH_DEVICE_ATTR(rxip_add4, add4, 0644, + qeth_l3_dev_rxip_add4_show, + qeth_l3_dev_rxip_add4_store); + +static ssize_t qeth_l3_dev_rxip_del_store(const char *buf, size_t count, + struct qeth_card *card, enum qeth_prot_versions proto) +{ + u8 addr[16]; + int rc; + + mutex_lock(&card->conf_mutex); + rc = qeth_l3_parse_rxipe(buf, proto, addr); + if (!rc) + rc = qeth_l3_modify_rxip_vipa(card, false, addr, + QETH_IP_TYPE_RXIP, proto); + mutex_unlock(&card->conf_mutex); + return rc ? rc : count; +} + +static ssize_t qeth_l3_dev_rxip_del4_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_rxip_del_store(buf, count, card, QETH_PROT_IPV4); +} + +static QETH_DEVICE_ATTR(rxip_del4, del4, 0200, NULL, + qeth_l3_dev_rxip_del4_store); + +static ssize_t qeth_l3_dev_rxip_add6_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return qeth_l3_dev_ip_add_show(dev, buf, QETH_PROT_IPV6, + QETH_IP_TYPE_RXIP); +} + +static ssize_t qeth_l3_dev_rxip_add6_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_rxip_add_store(buf, count, card, QETH_PROT_IPV6); +} + +static QETH_DEVICE_ATTR(rxip_add6, add6, 0644, + qeth_l3_dev_rxip_add6_show, + qeth_l3_dev_rxip_add6_store); + +static ssize_t qeth_l3_dev_rxip_del6_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct qeth_card *card = dev_get_drvdata(dev); + + if (!card) + return -EINVAL; + + return qeth_l3_dev_rxip_del_store(buf, count, card, QETH_PROT_IPV6); +} + +static QETH_DEVICE_ATTR(rxip_del6, del6, 0200, NULL, + qeth_l3_dev_rxip_del6_store); + +static struct attribute *qeth_rxip_device_attrs[] = { + &dev_attr_rxip_add4.attr, + &dev_attr_rxip_del4.attr, + &dev_attr_rxip_add6.attr, + &dev_attr_rxip_del6.attr, + NULL, +}; + +static const struct attribute_group qeth_device_rxip_group = { + .name = "rxip", + .attrs = qeth_rxip_device_attrs, +}; + +static const struct attribute_group *qeth_l3_only_attr_groups[] = { + &qeth_l3_device_attr_group, + &qeth_device_ipato_group, + &qeth_device_vipa_group, + &qeth_device_rxip_group, + NULL, +}; + +int qeth_l3_create_device_attributes(struct device *dev) +{ + return sysfs_create_groups(&dev->kobj, qeth_l3_only_attr_groups); +} + +void qeth_l3_remove_device_attributes(struct device *dev) +{ + sysfs_remove_groups(&dev->kobj, qeth_l3_only_attr_groups); +} + +const struct attribute_group *qeth_l3_attr_groups[] = { + &qeth_device_attr_group, + &qeth_device_blkt_group, + /* l3 specific, see qeth_l3_only_attr_groups: */ + &qeth_l3_device_attr_group, + &qeth_device_ipato_group, + &qeth_device_vipa_group, + &qeth_device_rxip_group, + NULL, +}; diff --git a/drivers/s390/net/smsgiucv.c b/drivers/s390/net/smsgiucv.c new file mode 100644 index 000000000..066b5c3aa --- /dev/null +++ b/drivers/s390/net/smsgiucv.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * IUCV special message driver + * + * Copyright IBM Corp. 2003, 2009 + * + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "smsgiucv.h" + +struct smsg_callback { + struct list_head list; + const char *prefix; + int len; + void (*callback)(const char *from, char *str); +}; + +MODULE_AUTHOR + ("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)"); +MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver"); + +static struct iucv_path *smsg_path; +/* dummy device used as trigger for PM functions */ +static struct device *smsg_dev; + +static DEFINE_SPINLOCK(smsg_list_lock); +static LIST_HEAD(smsg_list); +static int iucv_path_connected; + +static int smsg_path_pending(struct iucv_path *, u8 *, u8 *); +static void smsg_message_pending(struct iucv_path *, struct iucv_message *); + +static struct iucv_handler smsg_handler = { + .path_pending = smsg_path_pending, + .message_pending = smsg_message_pending, +}; + +static int smsg_path_pending(struct iucv_path *path, u8 *ipvmid, u8 *ipuser) +{ + if (strncmp(ipvmid, "*MSG ", 8) != 0) + return -EINVAL; + /* Path pending from *MSG. */ + return iucv_path_accept(path, &smsg_handler, "SMSGIUCV ", NULL); +} + +static void smsg_message_pending(struct iucv_path *path, + struct iucv_message *msg) +{ + struct smsg_callback *cb; + unsigned char *buffer; + unsigned char sender[9]; + int rc, i; + + buffer = kmalloc(msg->length + 1, GFP_ATOMIC | GFP_DMA); + if (!buffer) { + iucv_message_reject(path, msg); + return; + } + rc = iucv_message_receive(path, msg, 0, buffer, msg->length, NULL); + if (rc == 0) { + buffer[msg->length] = 0; + EBCASC(buffer, msg->length); + memcpy(sender, buffer, 8); + sender[8] = 0; + /* Remove trailing whitespace from the sender name. */ + for (i = 7; i >= 0; i--) { + if (sender[i] != ' ' && sender[i] != '\t') + break; + sender[i] = 0; + } + spin_lock(&smsg_list_lock); + list_for_each_entry(cb, &smsg_list, list) + if (strncmp(buffer + 8, cb->prefix, cb->len) == 0) { + cb->callback(sender, buffer + 8); + break; + } + spin_unlock(&smsg_list_lock); + } + kfree(buffer); +} + +int smsg_register_callback(const char *prefix, + void (*callback)(const char *from, char *str)) +{ + struct smsg_callback *cb; + + cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL); + if (!cb) + return -ENOMEM; + cb->prefix = prefix; + cb->len = strlen(prefix); + cb->callback = callback; + spin_lock_bh(&smsg_list_lock); + list_add_tail(&cb->list, &smsg_list); + spin_unlock_bh(&smsg_list_lock); + return 0; +} + +void smsg_unregister_callback(const char *prefix, + void (*callback)(const char *from, + char *str)) +{ + struct smsg_callback *cb, *tmp; + + spin_lock_bh(&smsg_list_lock); + cb = NULL; + list_for_each_entry(tmp, &smsg_list, list) + if (tmp->callback == callback && + strcmp(tmp->prefix, prefix) == 0) { + cb = tmp; + list_del(&cb->list); + break; + } + spin_unlock_bh(&smsg_list_lock); + kfree(cb); +} + +static int smsg_pm_freeze(struct device *dev) +{ +#ifdef CONFIG_PM_DEBUG + printk(KERN_WARNING "smsg_pm_freeze\n"); +#endif + if (smsg_path && iucv_path_connected) { + iucv_path_sever(smsg_path, NULL); + iucv_path_connected = 0; + } + return 0; +} + +static int smsg_pm_restore_thaw(struct device *dev) +{ + int rc; + +#ifdef CONFIG_PM_DEBUG + printk(KERN_WARNING "smsg_pm_restore_thaw\n"); +#endif + if (smsg_path && !iucv_path_connected) { + memset(smsg_path, 0, sizeof(*smsg_path)); + smsg_path->msglim = 255; + smsg_path->flags = 0; + rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ", + NULL, NULL, NULL); +#ifdef CONFIG_PM_DEBUG + if (rc) + printk(KERN_ERR + "iucv_path_connect returned with rc %i\n", rc); +#endif + if (!rc) + iucv_path_connected = 1; + cpcmd("SET SMSG IUCV", NULL, 0, NULL); + } + return 0; +} + +static const struct dev_pm_ops smsg_pm_ops = { + .freeze = smsg_pm_freeze, + .thaw = smsg_pm_restore_thaw, + .restore = smsg_pm_restore_thaw, +}; + +static struct device_driver smsg_driver = { + .owner = THIS_MODULE, + .name = SMSGIUCV_DRV_NAME, + .bus = &iucv_bus, + .pm = &smsg_pm_ops, +}; + +static void __exit smsg_exit(void) +{ + cpcmd("SET SMSG OFF", NULL, 0, NULL); + device_unregister(smsg_dev); + iucv_unregister(&smsg_handler, 1); + driver_unregister(&smsg_driver); +} + +static int __init smsg_init(void) +{ + int rc; + + if (!MACHINE_IS_VM) { + rc = -EPROTONOSUPPORT; + goto out; + } + rc = driver_register(&smsg_driver); + if (rc != 0) + goto out; + rc = iucv_register(&smsg_handler, 1); + if (rc) + goto out_driver; + smsg_path = iucv_path_alloc(255, 0, GFP_KERNEL); + if (!smsg_path) { + rc = -ENOMEM; + goto out_register; + } + rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ", + NULL, NULL, NULL); + if (rc) + goto out_free_path; + else + iucv_path_connected = 1; + smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL); + if (!smsg_dev) { + rc = -ENOMEM; + goto out_free_path; + } + dev_set_name(smsg_dev, "smsg_iucv"); + smsg_dev->bus = &iucv_bus; + smsg_dev->parent = iucv_root; + smsg_dev->release = (void (*)(struct device *))kfree; + smsg_dev->driver = &smsg_driver; + rc = device_register(smsg_dev); + if (rc) + goto out_put; + + cpcmd("SET SMSG IUCV", NULL, 0, NULL); + return 0; + +out_put: + put_device(smsg_dev); +out_free_path: + iucv_path_free(smsg_path); + smsg_path = NULL; +out_register: + iucv_unregister(&smsg_handler, 1); +out_driver: + driver_unregister(&smsg_driver); +out: + return rc; +} + +module_init(smsg_init); +module_exit(smsg_exit); +MODULE_LICENSE("GPL"); + +EXPORT_SYMBOL(smsg_register_callback); +EXPORT_SYMBOL(smsg_unregister_callback); diff --git a/drivers/s390/net/smsgiucv.h b/drivers/s390/net/smsgiucv.h new file mode 100644 index 000000000..a0d6c6130 --- /dev/null +++ b/drivers/s390/net/smsgiucv.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * IUCV special message driver + * + * Copyright IBM Corp. 2003 + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) + */ + +#define SMSGIUCV_DRV_NAME "SMSGIUCV" + +int smsg_register_callback(const char *, + void (*)(const char *, char *)); +void smsg_unregister_callback(const char *, + void (*)(const char *, char *)); + diff --git a/drivers/s390/net/smsgiucv_app.c b/drivers/s390/net/smsgiucv_app.c new file mode 100644 index 000000000..0a263999f --- /dev/null +++ b/drivers/s390/net/smsgiucv_app.c @@ -0,0 +1,219 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Deliver z/VM CP special messages (SMSG) as uevents. + * + * The driver registers for z/VM CP special messages with the + * "APP" prefix. Incoming messages are delivered to user space + * as uevents. + * + * Copyright IBM Corp. 2010 + * Author(s): Hendrik Brueckner + * + */ +#define KMSG_COMPONENT "smsgiucv_app" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "smsgiucv.h" + +/* prefix used for SMSG registration */ +#define SMSG_PREFIX "APP" + +/* SMSG related uevent environment variables */ +#define ENV_SENDER_STR "SMSG_SENDER=" +#define ENV_SENDER_LEN (strlen(ENV_SENDER_STR) + 8 + 1) +#define ENV_PREFIX_STR "SMSG_ID=" +#define ENV_PREFIX_LEN (strlen(ENV_PREFIX_STR) + \ + strlen(SMSG_PREFIX) + 1) +#define ENV_TEXT_STR "SMSG_TEXT=" +#define ENV_TEXT_LEN(msg) (strlen(ENV_TEXT_STR) + strlen((msg)) + 1) + +/* z/VM user ID which is permitted to send SMSGs + * If the value is undefined or empty (""), special messages are + * accepted from any z/VM user ID. */ +static char *sender; +module_param(sender, charp, 0400); +MODULE_PARM_DESC(sender, "z/VM user ID from which CP SMSGs are accepted"); + +/* SMSG device representation */ +static struct device *smsg_app_dev; + +/* list element for queuing received messages for delivery */ +struct smsg_app_event { + struct list_head list; + char *buf; + char *envp[4]; +}; + +/* queue for outgoing uevents */ +static LIST_HEAD(smsg_event_queue); +static DEFINE_SPINLOCK(smsg_event_queue_lock); + +static void smsg_app_event_free(struct smsg_app_event *ev) +{ + kfree(ev->buf); + kfree(ev); +} + +static struct smsg_app_event *smsg_app_event_alloc(const char *from, + const char *msg) +{ + struct smsg_app_event *ev; + + ev = kzalloc(sizeof(*ev), GFP_ATOMIC); + if (!ev) + return NULL; + + ev->buf = kzalloc(ENV_SENDER_LEN + ENV_PREFIX_LEN + + ENV_TEXT_LEN(msg), GFP_ATOMIC); + if (!ev->buf) { + kfree(ev); + return NULL; + } + + /* setting up environment pointers into buf */ + ev->envp[0] = ev->buf; + ev->envp[1] = ev->envp[0] + ENV_SENDER_LEN; + ev->envp[2] = ev->envp[1] + ENV_PREFIX_LEN; + ev->envp[3] = NULL; + + /* setting up environment: sender, prefix name, and message text */ + snprintf(ev->envp[0], ENV_SENDER_LEN, ENV_SENDER_STR "%s", from); + snprintf(ev->envp[1], ENV_PREFIX_LEN, ENV_PREFIX_STR "%s", SMSG_PREFIX); + snprintf(ev->envp[2], ENV_TEXT_LEN(msg), ENV_TEXT_STR "%s", msg); + + return ev; +} + +static void smsg_event_work_fn(struct work_struct *work) +{ + LIST_HEAD(event_queue); + struct smsg_app_event *p, *n; + struct device *dev; + + dev = get_device(smsg_app_dev); + if (!dev) + return; + + spin_lock_bh(&smsg_event_queue_lock); + list_splice_init(&smsg_event_queue, &event_queue); + spin_unlock_bh(&smsg_event_queue_lock); + + list_for_each_entry_safe(p, n, &event_queue, list) { + list_del(&p->list); + kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, p->envp); + smsg_app_event_free(p); + } + + put_device(dev); +} +static DECLARE_WORK(smsg_event_work, smsg_event_work_fn); + +static void smsg_app_callback(const char *from, char *msg) +{ + struct smsg_app_event *se; + + /* check if the originating z/VM user ID matches + * the configured sender. */ + if (sender && strlen(sender) > 0 && strcmp(from, sender) != 0) + return; + + /* get start of message text (skip prefix and leading blanks) */ + msg += strlen(SMSG_PREFIX); + while (*msg && isspace(*msg)) + msg++; + if (*msg == '\0') + return; + + /* allocate event list element and its environment */ + se = smsg_app_event_alloc(from, msg); + if (!se) + return; + + /* queue event and schedule work function */ + spin_lock(&smsg_event_queue_lock); + list_add_tail(&se->list, &smsg_event_queue); + spin_unlock(&smsg_event_queue_lock); + + schedule_work(&smsg_event_work); + return; +} + +static int __init smsgiucv_app_init(void) +{ + struct device_driver *smsgiucv_drv; + int rc; + + if (!MACHINE_IS_VM) + return -ENODEV; + + smsg_app_dev = kzalloc(sizeof(*smsg_app_dev), GFP_KERNEL); + if (!smsg_app_dev) + return -ENOMEM; + + smsgiucv_drv = driver_find(SMSGIUCV_DRV_NAME, &iucv_bus); + if (!smsgiucv_drv) { + kfree(smsg_app_dev); + return -ENODEV; + } + + rc = dev_set_name(smsg_app_dev, KMSG_COMPONENT); + if (rc) { + kfree(smsg_app_dev); + goto fail; + } + smsg_app_dev->bus = &iucv_bus; + smsg_app_dev->parent = iucv_root; + smsg_app_dev->release = (void (*)(struct device *)) kfree; + smsg_app_dev->driver = smsgiucv_drv; + rc = device_register(smsg_app_dev); + if (rc) { + put_device(smsg_app_dev); + goto fail; + } + + /* convert sender to uppercase characters */ + if (sender) { + int len = strlen(sender); + while (len--) + sender[len] = toupper(sender[len]); + } + + /* register with the smsgiucv device driver */ + rc = smsg_register_callback(SMSG_PREFIX, smsg_app_callback); + if (rc) { + device_unregister(smsg_app_dev); + goto fail; + } + + rc = 0; +fail: + return rc; +} +module_init(smsgiucv_app_init); + +static void __exit smsgiucv_app_exit(void) +{ + /* unregister callback */ + smsg_unregister_callback(SMSG_PREFIX, smsg_app_callback); + + /* cancel pending work and flush any queued event work */ + cancel_work_sync(&smsg_event_work); + smsg_event_work_fn(&smsg_event_work); + + device_unregister(smsg_app_dev); +} +module_exit(smsgiucv_app_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Deliver z/VM CP SMSG as uevents"); +MODULE_AUTHOR("Hendrik Brueckner "); diff --git a/drivers/s390/scsi/Makefile b/drivers/s390/scsi/Makefile new file mode 100644 index 000000000..9dda431ec --- /dev/null +++ b/drivers/s390/scsi/Makefile @@ -0,0 +1,10 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the S/390 specific device drivers +# + +zfcp-objs := zfcp_aux.o zfcp_ccw.o zfcp_dbf.o zfcp_erp.o \ + zfcp_fc.o zfcp_fsf.o zfcp_qdio.o zfcp_scsi.o zfcp_sysfs.o \ + zfcp_unit.o + +obj-$(CONFIG_ZFCP) += zfcp.o diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c new file mode 100644 index 000000000..d1b531fe9 --- /dev/null +++ b/drivers/s390/scsi/zfcp_aux.c @@ -0,0 +1,586 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * Module interface and handling of zfcp data structures. + * + * Copyright IBM Corp. 2002, 2013 + */ + +/* + * Driver authors: + * Martin Peschke (originator of the driver) + * Raimund Schroeder + * Aron Zeh + * Wolfgang Taphorn + * Stefan Bader + * Heiko Carstens (kernel 2.6 port of the driver) + * Andreas Herrmann + * Maxim Shchetynin + * Volker Sameske + * Ralph Wuerthner + * Michael Loehr + * Swen Schillig + * Christof Schmitt + * Martin Petermann + * Sven Schuetz + * Steffen Maier + */ + +#define KMSG_COMPONENT "zfcp" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include "zfcp_ext.h" +#include "zfcp_fc.h" +#include "zfcp_reqlist.h" + +#define ZFCP_BUS_ID_SIZE 20 + +MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com"); +MODULE_DESCRIPTION("FCP HBA driver"); +MODULE_LICENSE("GPL"); + +static char *init_device; +module_param_named(device, init_device, charp, 0400); +MODULE_PARM_DESC(device, "specify initial device"); + +static struct kmem_cache * __init zfcp_cache_hw_align(const char *name, + unsigned long size) +{ + return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL); +} + +static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun) +{ + struct ccw_device *cdev; + struct zfcp_adapter *adapter; + struct zfcp_port *port; + + cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid); + if (!cdev) + return; + + if (ccw_device_set_online(cdev)) + goto out_ccw_device; + + adapter = zfcp_ccw_adapter_by_cdev(cdev); + if (!adapter) + goto out_ccw_device; + + port = zfcp_get_port_by_wwpn(adapter, wwpn); + if (!port) + goto out_port; + flush_work(&port->rport_work); + + zfcp_unit_add(port, lun); + put_device(&port->dev); + +out_port: + zfcp_ccw_adapter_put(adapter); +out_ccw_device: + put_device(&cdev->dev); + return; +} + +static void __init zfcp_init_device_setup(char *devstr) +{ + char *token; + char *str, *str_saved; + char busid[ZFCP_BUS_ID_SIZE]; + u64 wwpn, lun; + + /* duplicate devstr and keep the original for sysfs presentation*/ + str_saved = kstrdup(devstr, GFP_KERNEL); + str = str_saved; + if (!str) + return; + + token = strsep(&str, ","); + if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE) + goto err_out; + strlcpy(busid, token, ZFCP_BUS_ID_SIZE); + + token = strsep(&str, ","); + if (!token || kstrtoull(token, 0, (unsigned long long *) &wwpn)) + goto err_out; + + token = strsep(&str, ","); + if (!token || kstrtoull(token, 0, (unsigned long long *) &lun)) + goto err_out; + + kfree(str_saved); + zfcp_init_device_configure(busid, wwpn, lun); + return; + +err_out: + kfree(str_saved); + pr_err("%s is not a valid SCSI device\n", devstr); +} + +static int __init zfcp_module_init(void) +{ + int retval = -ENOMEM; + + zfcp_fsf_qtcb_cache = zfcp_cache_hw_align("zfcp_fsf_qtcb", + sizeof(struct fsf_qtcb)); + if (!zfcp_fsf_qtcb_cache) + goto out_qtcb_cache; + + zfcp_fc_req_cache = zfcp_cache_hw_align("zfcp_fc_req", + sizeof(struct zfcp_fc_req)); + if (!zfcp_fc_req_cache) + goto out_fc_cache; + + zfcp_scsi_transport_template = + fc_attach_transport(&zfcp_transport_functions); + if (!zfcp_scsi_transport_template) + goto out_transport; + scsi_transport_reserve_device(zfcp_scsi_transport_template, + sizeof(struct zfcp_scsi_dev)); + + retval = ccw_driver_register(&zfcp_ccw_driver); + if (retval) { + pr_err("The zfcp device driver could not register with " + "the common I/O layer\n"); + goto out_ccw_register; + } + + if (init_device) + zfcp_init_device_setup(init_device); + return 0; + +out_ccw_register: + fc_release_transport(zfcp_scsi_transport_template); +out_transport: + kmem_cache_destroy(zfcp_fc_req_cache); +out_fc_cache: + kmem_cache_destroy(zfcp_fsf_qtcb_cache); +out_qtcb_cache: + return retval; +} + +module_init(zfcp_module_init); + +static void __exit zfcp_module_exit(void) +{ + ccw_driver_unregister(&zfcp_ccw_driver); + fc_release_transport(zfcp_scsi_transport_template); + kmem_cache_destroy(zfcp_fc_req_cache); + kmem_cache_destroy(zfcp_fsf_qtcb_cache); +} + +module_exit(zfcp_module_exit); + +/** + * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn + * @adapter: pointer to adapter to search for port + * @wwpn: wwpn to search for + * + * Returns: pointer to zfcp_port or NULL + */ +struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, + u64 wwpn) +{ + unsigned long flags; + struct zfcp_port *port; + + read_lock_irqsave(&adapter->port_list_lock, flags); + list_for_each_entry(port, &adapter->port_list, list) + if (port->wwpn == wwpn) { + if (!get_device(&port->dev)) + port = NULL; + read_unlock_irqrestore(&adapter->port_list_lock, flags); + return port; + } + read_unlock_irqrestore(&adapter->port_list_lock, flags); + return NULL; +} + +static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter) +{ + adapter->pool.erp_req = + mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); + if (!adapter->pool.erp_req) + return -ENOMEM; + + adapter->pool.gid_pn_req = + mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); + if (!adapter->pool.gid_pn_req) + return -ENOMEM; + + adapter->pool.scsi_req = + mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); + if (!adapter->pool.scsi_req) + return -ENOMEM; + + adapter->pool.scsi_abort = + mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); + if (!adapter->pool.scsi_abort) + return -ENOMEM; + + adapter->pool.status_read_req = + mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM, + sizeof(struct zfcp_fsf_req)); + if (!adapter->pool.status_read_req) + return -ENOMEM; + + adapter->pool.qtcb_pool = + mempool_create_slab_pool(4, zfcp_fsf_qtcb_cache); + if (!adapter->pool.qtcb_pool) + return -ENOMEM; + + BUILD_BUG_ON(sizeof(struct fsf_status_read_buffer) > PAGE_SIZE); + adapter->pool.sr_data = + mempool_create_page_pool(FSF_STATUS_READS_RECOM, 0); + if (!adapter->pool.sr_data) + return -ENOMEM; + + adapter->pool.gid_pn = + mempool_create_slab_pool(1, zfcp_fc_req_cache); + if (!adapter->pool.gid_pn) + return -ENOMEM; + + return 0; +} + +static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter) +{ + if (adapter->pool.erp_req) + mempool_destroy(adapter->pool.erp_req); + if (adapter->pool.scsi_req) + mempool_destroy(adapter->pool.scsi_req); + if (adapter->pool.scsi_abort) + mempool_destroy(adapter->pool.scsi_abort); + if (adapter->pool.qtcb_pool) + mempool_destroy(adapter->pool.qtcb_pool); + if (adapter->pool.status_read_req) + mempool_destroy(adapter->pool.status_read_req); + if (adapter->pool.sr_data) + mempool_destroy(adapter->pool.sr_data); + if (adapter->pool.gid_pn) + mempool_destroy(adapter->pool.gid_pn); +} + +/** + * zfcp_status_read_refill - refill the long running status_read_requests + * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled + * + * Returns: 0 on success, 1 otherwise + * + * if there are 16 or more status_read requests missing an adapter_reopen + * is triggered + */ +int zfcp_status_read_refill(struct zfcp_adapter *adapter) +{ + while (atomic_add_unless(&adapter->stat_miss, -1, 0)) + if (zfcp_fsf_status_read(adapter->qdio)) { + atomic_inc(&adapter->stat_miss); /* undo add -1 */ + if (atomic_read(&adapter->stat_miss) >= + adapter->stat_read_buf_num) { + zfcp_erp_adapter_reopen(adapter, 0, "axsref1"); + return 1; + } + break; + } + return 0; +} + +static void _zfcp_status_read_scheduler(struct work_struct *work) +{ + zfcp_status_read_refill(container_of(work, struct zfcp_adapter, + stat_work)); +} + +static void zfcp_print_sl(struct seq_file *m, struct service_level *sl) +{ + struct zfcp_adapter *adapter = + container_of(sl, struct zfcp_adapter, service_level); + + seq_printf(m, "zfcp: %s microcode level %x\n", + dev_name(&adapter->ccw_device->dev), + adapter->fsf_lic_version); +} + +static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter) +{ + char name[TASK_COMM_LEN]; + + snprintf(name, sizeof(name), "zfcp_q_%s", + dev_name(&adapter->ccw_device->dev)); + adapter->work_queue = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM); + + if (adapter->work_queue) + return 0; + return -ENOMEM; +} + +static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter) +{ + if (adapter->work_queue) + destroy_workqueue(adapter->work_queue); + adapter->work_queue = NULL; + +} + +/** + * zfcp_adapter_enqueue - enqueue a new adapter to the list + * @ccw_device: pointer to the struct cc_device + * + * Returns: struct zfcp_adapter* + * Enqueues an adapter at the end of the adapter list in the driver data. + * All adapter internal structures are set up. + * Proc-fs entries are also created. + */ +struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device) +{ + struct zfcp_adapter *adapter; + + if (!get_device(&ccw_device->dev)) + return ERR_PTR(-ENODEV); + + adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL); + if (!adapter) { + put_device(&ccw_device->dev); + return ERR_PTR(-ENOMEM); + } + + kref_init(&adapter->ref); + + ccw_device->handler = NULL; + adapter->ccw_device = ccw_device; + + INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler); + INIT_DELAYED_WORK(&adapter->scan_work, zfcp_fc_scan_ports); + INIT_WORK(&adapter->ns_up_work, zfcp_fc_sym_name_update); + + adapter->next_port_scan = jiffies; + + adapter->erp_action.adapter = adapter; + + if (zfcp_qdio_setup(adapter)) + goto failed; + + if (zfcp_allocate_low_mem_buffers(adapter)) + goto failed; + + adapter->req_list = zfcp_reqlist_alloc(); + if (!adapter->req_list) + goto failed; + + if (zfcp_dbf_adapter_register(adapter)) + goto failed; + + if (zfcp_setup_adapter_work_queue(adapter)) + goto failed; + + if (zfcp_fc_gs_setup(adapter)) + goto failed; + + rwlock_init(&adapter->port_list_lock); + INIT_LIST_HEAD(&adapter->port_list); + + INIT_LIST_HEAD(&adapter->events.list); + INIT_WORK(&adapter->events.work, zfcp_fc_post_event); + spin_lock_init(&adapter->events.list_lock); + + init_waitqueue_head(&adapter->erp_ready_wq); + init_waitqueue_head(&adapter->erp_done_wqh); + + INIT_LIST_HEAD(&adapter->erp_ready_head); + INIT_LIST_HEAD(&adapter->erp_running_head); + + rwlock_init(&adapter->erp_lock); + rwlock_init(&adapter->abort_lock); + + if (zfcp_erp_thread_setup(adapter)) + goto failed; + + adapter->service_level.seq_print = zfcp_print_sl; + + dev_set_drvdata(&ccw_device->dev, adapter); + + if (sysfs_create_group(&ccw_device->dev.kobj, + &zfcp_sysfs_adapter_attrs)) + goto failed; + + /* report size limit per scatter-gather segment */ + adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN; + adapter->ccw_device->dev.dma_parms = &adapter->dma_parms; + + adapter->stat_read_buf_num = FSF_STATUS_READS_RECOM; + + if (!zfcp_scsi_adapter_register(adapter)) + return adapter; + +failed: + zfcp_adapter_unregister(adapter); + return ERR_PTR(-ENOMEM); +} + +void zfcp_adapter_unregister(struct zfcp_adapter *adapter) +{ + struct ccw_device *cdev = adapter->ccw_device; + + cancel_delayed_work_sync(&adapter->scan_work); + cancel_work_sync(&adapter->stat_work); + cancel_work_sync(&adapter->ns_up_work); + zfcp_destroy_adapter_work_queue(adapter); + + zfcp_fc_wka_ports_force_offline(adapter->gs); + zfcp_scsi_adapter_unregister(adapter); + sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs); + + zfcp_erp_thread_kill(adapter); + zfcp_dbf_adapter_unregister(adapter); + zfcp_qdio_destroy(adapter->qdio); + + zfcp_ccw_adapter_put(adapter); /* final put to release */ +} + +/** + * zfcp_adapter_release - remove the adapter from the resource list + * @ref: pointer to struct kref + * locks: adapter list write lock is assumed to be held by caller + */ +void zfcp_adapter_release(struct kref *ref) +{ + struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter, + ref); + struct ccw_device *cdev = adapter->ccw_device; + + dev_set_drvdata(&adapter->ccw_device->dev, NULL); + zfcp_fc_gs_destroy(adapter); + zfcp_free_low_mem_buffers(adapter); + kfree(adapter->req_list); + kfree(adapter->fc_stats); + kfree(adapter->stats_reset_data); + kfree(adapter); + put_device(&cdev->dev); +} + +static void zfcp_port_release(struct device *dev) +{ + struct zfcp_port *port = container_of(dev, struct zfcp_port, dev); + + zfcp_ccw_adapter_put(port->adapter); + kfree(port); +} + +/** + * zfcp_port_enqueue - enqueue port to port list of adapter + * @adapter: adapter where remote port is added + * @wwpn: WWPN of the remote port to be enqueued + * @status: initial status for the port + * @d_id: destination id of the remote port to be enqueued + * Returns: pointer to enqueued port on success, ERR_PTR on error + * + * All port internal structures are set up and the sysfs entry is generated. + * d_id is used to enqueue ports with a well known address like the Directory + * Service for nameserver lookup. + */ +struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn, + u32 status, u32 d_id) +{ + struct zfcp_port *port; + int retval = -ENOMEM; + + kref_get(&adapter->ref); + + port = zfcp_get_port_by_wwpn(adapter, wwpn); + if (port) { + put_device(&port->dev); + retval = -EEXIST; + goto err_out; + } + + port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL); + if (!port) + goto err_out; + + rwlock_init(&port->unit_list_lock); + INIT_LIST_HEAD(&port->unit_list); + atomic_set(&port->units, 0); + + INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup); + INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work); + INIT_WORK(&port->rport_work, zfcp_scsi_rport_work); + + port->adapter = adapter; + port->d_id = d_id; + port->wwpn = wwpn; + port->rport_task = RPORT_NONE; + port->dev.parent = &adapter->ccw_device->dev; + port->dev.groups = zfcp_port_attr_groups; + port->dev.release = zfcp_port_release; + + port->erp_action.adapter = adapter; + port->erp_action.port = port; + + if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) { + kfree(port); + goto err_out; + } + retval = -EINVAL; + + if (device_register(&port->dev)) { + put_device(&port->dev); + goto err_out; + } + + write_lock_irq(&adapter->port_list_lock); + list_add_tail(&port->list, &adapter->port_list); + write_unlock_irq(&adapter->port_list_lock); + + atomic_or(status | ZFCP_STATUS_COMMON_RUNNING, &port->status); + + return port; + +err_out: + zfcp_ccw_adapter_put(adapter); + return ERR_PTR(retval); +} + +/** + * zfcp_sg_free_table - free memory used by scatterlists + * @sg: pointer to scatterlist + * @count: number of scatterlist which are to be free'ed + * the scatterlist are expected to reference pages always + */ +void zfcp_sg_free_table(struct scatterlist *sg, int count) +{ + int i; + + for (i = 0; i < count; i++, sg++) + if (sg) + free_page((unsigned long) sg_virt(sg)); + else + break; +} + +/** + * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers + * @sg: pointer to struct scatterlist + * @count: number of scatterlists which should be assigned with buffers + * of size page + * + * Returns: 0 on success, -ENOMEM otherwise + */ +int zfcp_sg_setup_table(struct scatterlist *sg, int count) +{ + void *addr; + int i; + + sg_init_table(sg, count); + for (i = 0; i < count; i++, sg++) { + addr = (void *) get_zeroed_page(GFP_KERNEL); + if (!addr) { + zfcp_sg_free_table(sg, i); + return -ENOMEM; + } + sg_set_buf(sg, addr, PAGE_SIZE); + } + return 0; +} diff --git a/drivers/s390/scsi/zfcp_ccw.c b/drivers/s390/scsi/zfcp_ccw.c new file mode 100644 index 000000000..49eda141e --- /dev/null +++ b/drivers/s390/scsi/zfcp_ccw.c @@ -0,0 +1,341 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * Registration and callback for the s390 common I/O layer. + * + * Copyright IBM Corp. 2002, 2010 + */ + +#define KMSG_COMPONENT "zfcp" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include "zfcp_ext.h" +#include "zfcp_reqlist.h" + +#define ZFCP_MODEL_PRIV 0x4 + +static DEFINE_SPINLOCK(zfcp_ccw_adapter_ref_lock); + +struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *cdev) +{ + struct zfcp_adapter *adapter; + unsigned long flags; + + spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags); + adapter = dev_get_drvdata(&cdev->dev); + if (adapter) + kref_get(&adapter->ref); + spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags); + return adapter; +} + +void zfcp_ccw_adapter_put(struct zfcp_adapter *adapter) +{ + unsigned long flags; + + spin_lock_irqsave(&zfcp_ccw_adapter_ref_lock, flags); + kref_put(&adapter->ref, zfcp_adapter_release); + spin_unlock_irqrestore(&zfcp_ccw_adapter_ref_lock, flags); +} + +/** + * zfcp_ccw_activate - activate adapter and wait for it to finish + * @cdev: pointer to belonging ccw device + * @clear: Status flags to clear. + * @tag: s390dbf trace record tag + */ +static int zfcp_ccw_activate(struct ccw_device *cdev, int clear, char *tag) +{ + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); + + if (!adapter) + return 0; + + zfcp_erp_clear_adapter_status(adapter, clear); + zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING); + zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, + tag); + + /* + * We want to scan ports here, with some random backoff and without + * rate limit. Recovery has already scheduled a port scan for us, + * but with both random delay and rate limit. Nevertheless we get + * what we want here by flushing the scheduled work after sleeping + * an equivalent random time. + * Let the port scan random delay elapse first. If recovery finishes + * up to that point in time, that would be perfect for both recovery + * and port scan. If not, i.e. recovery takes ages, there was no + * point in waiting a random delay on top of the time consumed by + * recovery. + */ + msleep(zfcp_fc_port_scan_backoff()); + zfcp_erp_wait(adapter); + flush_delayed_work(&adapter->scan_work); + + zfcp_ccw_adapter_put(adapter); + + return 0; +} + +static struct ccw_device_id zfcp_ccw_device_id[] = { + { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) }, + { CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) }, + {}, +}; +MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id); + +/** + * zfcp_ccw_probe - probe function of zfcp driver + * @cdev: pointer to belonging ccw device + * + * This function gets called by the common i/o layer for each FCP + * device found on the current system. This is only a stub to make cio + * work: To only allocate adapter resources for devices actually used, + * the allocation is deferred to the first call to ccw_set_online. + */ +static int zfcp_ccw_probe(struct ccw_device *cdev) +{ + return 0; +} + +/** + * zfcp_ccw_remove - remove function of zfcp driver + * @cdev: pointer to belonging ccw device + * + * This function gets called by the common i/o layer and removes an adapter + * from the system. Task of this function is to get rid of all units and + * ports that belong to this adapter. And in addition all resources of this + * adapter will be freed too. + */ +static void zfcp_ccw_remove(struct ccw_device *cdev) +{ + struct zfcp_adapter *adapter; + struct zfcp_port *port, *p; + struct zfcp_unit *unit, *u; + LIST_HEAD(unit_remove_lh); + LIST_HEAD(port_remove_lh); + + ccw_device_set_offline(cdev); + + adapter = zfcp_ccw_adapter_by_cdev(cdev); + if (!adapter) + return; + + write_lock_irq(&adapter->port_list_lock); + list_for_each_entry_safe(port, p, &adapter->port_list, list) { + write_lock(&port->unit_list_lock); + list_for_each_entry_safe(unit, u, &port->unit_list, list) + list_move(&unit->list, &unit_remove_lh); + write_unlock(&port->unit_list_lock); + list_move(&port->list, &port_remove_lh); + } + write_unlock_irq(&adapter->port_list_lock); + zfcp_ccw_adapter_put(adapter); /* put from zfcp_ccw_adapter_by_cdev */ + + list_for_each_entry_safe(unit, u, &unit_remove_lh, list) + device_unregister(&unit->dev); + + list_for_each_entry_safe(port, p, &port_remove_lh, list) + device_unregister(&port->dev); + + zfcp_adapter_unregister(adapter); +} + +/** + * zfcp_ccw_set_online - set_online function of zfcp driver + * @cdev: pointer to belonging ccw device + * + * This function gets called by the common i/o layer and sets an + * adapter into state online. The first call will allocate all + * adapter resources that will be retained until the device is removed + * via zfcp_ccw_remove. + * + * Setting an fcp device online means that it will be registered with + * the SCSI stack, that the QDIO queues will be set up and that the + * adapter will be opened. + */ +static int zfcp_ccw_set_online(struct ccw_device *cdev) +{ + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); + + if (!adapter) { + adapter = zfcp_adapter_enqueue(cdev); + + if (IS_ERR(adapter)) { + dev_err(&cdev->dev, + "Setting up data structures for the " + "FCP adapter failed\n"); + return PTR_ERR(adapter); + } + kref_get(&adapter->ref); + } + + /* initialize request counter */ + BUG_ON(!zfcp_reqlist_isempty(adapter->req_list)); + adapter->req_no = 0; + + zfcp_ccw_activate(cdev, 0, "ccsonl1"); + + /* + * We want to scan ports here, always, with some random delay and + * without rate limit - basically what zfcp_ccw_activate() has + * achieved for us. Not quite! That port scan depended on + * !no_auto_port_rescan. So let's cover the no_auto_port_rescan + * case here to make sure a port scan is done unconditionally. + * Since zfcp_ccw_activate() has waited the desired random time, + * we can immediately schedule and flush a port scan for the + * remaining cases. + */ + zfcp_fc_inverse_conditional_port_scan(adapter); + flush_delayed_work(&adapter->scan_work); + zfcp_ccw_adapter_put(adapter); + return 0; +} + +/** + * zfcp_ccw_offline_sync - shut down adapter and wait for it to finish + * @cdev: pointer to belonging ccw device + * @set: Status flags to set. + * @tag: s390dbf trace record tag + * + * This function gets called by the common i/o layer and sets an adapter + * into state offline. + */ +static int zfcp_ccw_offline_sync(struct ccw_device *cdev, int set, char *tag) +{ + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); + + if (!adapter) + return 0; + + zfcp_erp_set_adapter_status(adapter, set); + zfcp_erp_adapter_shutdown(adapter, 0, tag); + zfcp_erp_wait(adapter); + + zfcp_ccw_adapter_put(adapter); + return 0; +} + +/** + * zfcp_ccw_set_offline - set_offline function of zfcp driver + * @cdev: pointer to belonging ccw device + * + * This function gets called by the common i/o layer and sets an adapter + * into state offline. + */ +static int zfcp_ccw_set_offline(struct ccw_device *cdev) +{ + return zfcp_ccw_offline_sync(cdev, 0, "ccsoff1"); +} + +/** + * zfcp_ccw_notify - ccw notify function + * @cdev: pointer to belonging ccw device + * @event: indicates if adapter was detached or attached + * + * This function gets called by the common i/o layer if an adapter has gone + * or reappeared. + */ +static int zfcp_ccw_notify(struct ccw_device *cdev, int event) +{ + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); + + if (!adapter) + return 1; + + switch (event) { + case CIO_GONE: + if (atomic_read(&adapter->status) & + ZFCP_STATUS_ADAPTER_SUSPENDED) { /* notification ignore */ + zfcp_dbf_hba_basic("ccnigo1", adapter); + break; + } + dev_warn(&cdev->dev, "The FCP device has been detached\n"); + zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1"); + break; + case CIO_NO_PATH: + dev_warn(&cdev->dev, + "The CHPID for the FCP device is offline\n"); + zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2"); + break; + case CIO_OPER: + if (atomic_read(&adapter->status) & + ZFCP_STATUS_ADAPTER_SUSPENDED) { /* notification ignore */ + zfcp_dbf_hba_basic("ccniop1", adapter); + break; + } + dev_info(&cdev->dev, "The FCP device is operational again\n"); + zfcp_erp_set_adapter_status(adapter, + ZFCP_STATUS_COMMON_RUNNING); + zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, + "ccnoti4"); + break; + case CIO_BOXED: + dev_warn(&cdev->dev, "The FCP device did not respond within " + "the specified time\n"); + zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5"); + break; + } + + zfcp_ccw_adapter_put(adapter); + return 1; +} + +/** + * zfcp_ccw_shutdown - handle shutdown from cio + * @cdev: device for adapter to shutdown. + */ +static void zfcp_ccw_shutdown(struct ccw_device *cdev) +{ + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); + + if (!adapter) + return; + + zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1"); + zfcp_erp_wait(adapter); + zfcp_erp_thread_kill(adapter); + + zfcp_ccw_adapter_put(adapter); +} + +static int zfcp_ccw_suspend(struct ccw_device *cdev) +{ + zfcp_ccw_offline_sync(cdev, ZFCP_STATUS_ADAPTER_SUSPENDED, "ccsusp1"); + return 0; +} + +static int zfcp_ccw_thaw(struct ccw_device *cdev) +{ + /* trace records for thaw and final shutdown during suspend + can only be found in system dump until the end of suspend + but not after resume because it's based on the memory image + right after the very first suspend (freeze) callback */ + zfcp_ccw_activate(cdev, 0, "ccthaw1"); + return 0; +} + +static int zfcp_ccw_resume(struct ccw_device *cdev) +{ + zfcp_ccw_activate(cdev, ZFCP_STATUS_ADAPTER_SUSPENDED, "ccresu1"); + return 0; +} + +struct ccw_driver zfcp_ccw_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "zfcp", + }, + .ids = zfcp_ccw_device_id, + .probe = zfcp_ccw_probe, + .remove = zfcp_ccw_remove, + .set_online = zfcp_ccw_set_online, + .set_offline = zfcp_ccw_set_offline, + .notify = zfcp_ccw_notify, + .shutdown = zfcp_ccw_shutdown, + .freeze = zfcp_ccw_suspend, + .thaw = zfcp_ccw_thaw, + .restore = zfcp_ccw_resume, +}; diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c new file mode 100644 index 000000000..946380f0d --- /dev/null +++ b/drivers/s390/scsi/zfcp_dbf.c @@ -0,0 +1,817 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * Debug traces for zfcp. + * + * Copyright IBM Corp. 2002, 2018 + */ + +#define KMSG_COMPONENT "zfcp" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include "zfcp_dbf.h" +#include "zfcp_ext.h" +#include "zfcp_fc.h" + +static u32 dbfsize = 4; + +module_param(dbfsize, uint, 0400); +MODULE_PARM_DESC(dbfsize, + "number of pages for each debug feature area (default 4)"); + +static u32 dbflevel = 3; + +module_param(dbflevel, uint, 0400); +MODULE_PARM_DESC(dbflevel, + "log level for each debug feature area " + "(default 3, range 0..6)"); + +static inline unsigned int zfcp_dbf_plen(unsigned int offset) +{ + return sizeof(struct zfcp_dbf_pay) + offset - ZFCP_DBF_PAY_MAX_REC; +} + +static inline +void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area, + u64 req_id) +{ + struct zfcp_dbf_pay *pl = &dbf->pay_buf; + u16 offset = 0, rec_length; + + spin_lock(&dbf->pay_lock); + memset(pl, 0, sizeof(*pl)); + pl->fsf_req_id = req_id; + memcpy(pl->area, area, ZFCP_DBF_TAG_LEN); + + while (offset < length) { + rec_length = min((u16) ZFCP_DBF_PAY_MAX_REC, + (u16) (length - offset)); + memcpy(pl->data, data + offset, rec_length); + debug_event(dbf->pay, 1, pl, zfcp_dbf_plen(rec_length)); + + offset += rec_length; + pl->counter++; + } + + spin_unlock(&dbf->pay_lock); +} + +/** + * zfcp_dbf_hba_fsf_res - trace event for fsf responses + * @tag: tag indicating which kind of unsolicited status has been received + * @req: request for which a response was received + */ +void zfcp_dbf_hba_fsf_res(char *tag, int level, struct zfcp_fsf_req *req) +{ + struct zfcp_dbf *dbf = req->adapter->dbf; + struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix; + struct fsf_qtcb_header *q_head = &req->qtcb->header; + struct zfcp_dbf_hba *rec = &dbf->hba_buf; + unsigned long flags; + + spin_lock_irqsave(&dbf->hba_lock, flags); + memset(rec, 0, sizeof(*rec)); + + memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); + rec->id = ZFCP_DBF_HBA_RES; + rec->fsf_req_id = req->req_id; + rec->fsf_req_status = req->status; + rec->fsf_cmd = req->fsf_command; + rec->fsf_seq_no = req->seq_no; + rec->u.res.req_issued = req->issued; + rec->u.res.prot_status = q_pref->prot_status; + rec->u.res.fsf_status = q_head->fsf_status; + rec->u.res.port_handle = q_head->port_handle; + rec->u.res.lun_handle = q_head->lun_handle; + + memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual, + FSF_PROT_STATUS_QUAL_SIZE); + memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual, + FSF_STATUS_QUALIFIER_SIZE); + + rec->pl_len = q_head->log_length; + zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start, + rec->pl_len, "fsf_res", req->req_id); + + debug_event(dbf->hba, level, rec, sizeof(*rec)); + spin_unlock_irqrestore(&dbf->hba_lock, flags); +} + +/** + * zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer + * @tag: tag indicating which kind of unsolicited status has been received + * @req: request providing the unsolicited status + */ +void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req) +{ + struct zfcp_dbf *dbf = req->adapter->dbf; + struct fsf_status_read_buffer *srb = req->data; + struct zfcp_dbf_hba *rec = &dbf->hba_buf; + static int const level = 2; + unsigned long flags; + + if (unlikely(!debug_level_enabled(dbf->hba, level))) + return; + + spin_lock_irqsave(&dbf->hba_lock, flags); + memset(rec, 0, sizeof(*rec)); + + memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); + rec->id = ZFCP_DBF_HBA_USS; + rec->fsf_req_id = req->req_id; + rec->fsf_req_status = req->status; + rec->fsf_cmd = req->fsf_command; + + if (!srb) + goto log; + + rec->u.uss.status_type = srb->status_type; + rec->u.uss.status_subtype = srb->status_subtype; + rec->u.uss.d_id = ntoh24(srb->d_id); + rec->u.uss.lun = srb->fcp_lun; + memcpy(&rec->u.uss.queue_designator, &srb->queue_designator, + sizeof(rec->u.uss.queue_designator)); + + /* status read buffer payload length */ + rec->pl_len = (!srb->length) ? 0 : srb->length - + offsetof(struct fsf_status_read_buffer, payload); + + if (rec->pl_len) + zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len, + "fsf_uss", req->req_id); +log: + debug_event(dbf->hba, level, rec, sizeof(*rec)); + spin_unlock_irqrestore(&dbf->hba_lock, flags); +} + +/** + * zfcp_dbf_hba_bit_err - trace event for bit error conditions + * @tag: tag indicating which kind of unsolicited status has been received + * @req: request which caused the bit_error condition + */ +void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req) +{ + struct zfcp_dbf *dbf = req->adapter->dbf; + struct zfcp_dbf_hba *rec = &dbf->hba_buf; + struct fsf_status_read_buffer *sr_buf = req->data; + static int const level = 1; + unsigned long flags; + + if (unlikely(!debug_level_enabled(dbf->hba, level))) + return; + + spin_lock_irqsave(&dbf->hba_lock, flags); + memset(rec, 0, sizeof(*rec)); + + memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); + rec->id = ZFCP_DBF_HBA_BIT; + rec->fsf_req_id = req->req_id; + rec->fsf_req_status = req->status; + rec->fsf_cmd = req->fsf_command; + memcpy(&rec->u.be, &sr_buf->payload.bit_error, + sizeof(struct fsf_bit_error_payload)); + + debug_event(dbf->hba, level, rec, sizeof(*rec)); + spin_unlock_irqrestore(&dbf->hba_lock, flags); +} + +/** + * zfcp_dbf_hba_def_err - trace event for deferred error messages + * @adapter: pointer to struct zfcp_adapter + * @req_id: request id which caused the deferred error message + * @scount: number of sbals incl. the signaling sbal + * @pl: array of all involved sbals + */ +void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount, + void **pl) +{ + struct zfcp_dbf *dbf = adapter->dbf; + struct zfcp_dbf_pay *payload = &dbf->pay_buf; + unsigned long flags; + static int const level = 1; + u16 length; + + if (unlikely(!debug_level_enabled(dbf->pay, level))) + return; + + if (!pl) + return; + + spin_lock_irqsave(&dbf->pay_lock, flags); + memset(payload, 0, sizeof(*payload)); + + memcpy(payload->area, "def_err", 7); + payload->fsf_req_id = req_id; + payload->counter = 0; + length = min((u16)sizeof(struct qdio_buffer), + (u16)ZFCP_DBF_PAY_MAX_REC); + + while (payload->counter < scount && (char *)pl[payload->counter]) { + memcpy(payload->data, (char *)pl[payload->counter], length); + debug_event(dbf->pay, level, payload, zfcp_dbf_plen(length)); + payload->counter++; + } + + spin_unlock_irqrestore(&dbf->pay_lock, flags); +} + +/** + * zfcp_dbf_hba_basic - trace event for basic adapter events + * @adapter: pointer to struct zfcp_adapter + */ +void zfcp_dbf_hba_basic(char *tag, struct zfcp_adapter *adapter) +{ + struct zfcp_dbf *dbf = adapter->dbf; + struct zfcp_dbf_hba *rec = &dbf->hba_buf; + static int const level = 1; + unsigned long flags; + + if (unlikely(!debug_level_enabled(dbf->hba, level))) + return; + + spin_lock_irqsave(&dbf->hba_lock, flags); + memset(rec, 0, sizeof(*rec)); + + memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); + rec->id = ZFCP_DBF_HBA_BASIC; + + debug_event(dbf->hba, level, rec, sizeof(*rec)); + spin_unlock_irqrestore(&dbf->hba_lock, flags); +} + +static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec, + struct zfcp_adapter *adapter, + struct zfcp_port *port, + struct scsi_device *sdev) +{ + rec->adapter_status = atomic_read(&adapter->status); + if (port) { + rec->port_status = atomic_read(&port->status); + rec->wwpn = port->wwpn; + rec->d_id = port->d_id; + } + if (sdev) { + rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status); + rec->lun = zfcp_scsi_dev_lun(sdev); + } else + rec->lun = ZFCP_DBF_INVALID_LUN; +} + +/** + * zfcp_dbf_rec_trig - trace event related to triggered recovery + * @tag: identifier for event + * @adapter: adapter on which the erp_action should run + * @port: remote port involved in the erp_action + * @sdev: scsi device involved in the erp_action + * @want: wanted erp_action + * @need: required erp_action + * + * The adapter->erp_lock has to be held. + */ +void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter, + struct zfcp_port *port, struct scsi_device *sdev, + u8 want, u8 need) +{ + struct zfcp_dbf *dbf = adapter->dbf; + struct zfcp_dbf_rec *rec = &dbf->rec_buf; + static int const level = 1; + struct list_head *entry; + unsigned long flags; + + lockdep_assert_held(&adapter->erp_lock); + + if (unlikely(!debug_level_enabled(dbf->rec, level))) + return; + + spin_lock_irqsave(&dbf->rec_lock, flags); + memset(rec, 0, sizeof(*rec)); + + rec->id = ZFCP_DBF_REC_TRIG; + memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); + zfcp_dbf_set_common(rec, adapter, port, sdev); + + list_for_each(entry, &adapter->erp_ready_head) + rec->u.trig.ready++; + + list_for_each(entry, &adapter->erp_running_head) + rec->u.trig.running++; + + rec->u.trig.want = want; + rec->u.trig.need = need; + + debug_event(dbf->rec, level, rec, sizeof(*rec)); + spin_unlock_irqrestore(&dbf->rec_lock, flags); +} + +/** + * zfcp_dbf_rec_trig_lock - trace event related to triggered recovery with lock + * @tag: identifier for event + * @adapter: adapter on which the erp_action should run + * @port: remote port involved in the erp_action + * @sdev: scsi device involved in the erp_action + * @want: wanted erp_action + * @need: required erp_action + * + * The adapter->erp_lock must not be held. + */ +void zfcp_dbf_rec_trig_lock(char *tag, struct zfcp_adapter *adapter, + struct zfcp_port *port, struct scsi_device *sdev, + u8 want, u8 need) +{ + unsigned long flags; + + read_lock_irqsave(&adapter->erp_lock, flags); + zfcp_dbf_rec_trig(tag, adapter, port, sdev, want, need); + read_unlock_irqrestore(&adapter->erp_lock, flags); +} + +/** + * zfcp_dbf_rec_run_lvl - trace event related to running recovery + * @level: trace level to be used for event + * @tag: identifier for event + * @erp: erp_action running + */ +void zfcp_dbf_rec_run_lvl(int level, char *tag, struct zfcp_erp_action *erp) +{ + struct zfcp_dbf *dbf = erp->adapter->dbf; + struct zfcp_dbf_rec *rec = &dbf->rec_buf; + unsigned long flags; + + if (!debug_level_enabled(dbf->rec, level)) + return; + + spin_lock_irqsave(&dbf->rec_lock, flags); + memset(rec, 0, sizeof(*rec)); + + rec->id = ZFCP_DBF_REC_RUN; + memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); + zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev); + + rec->u.run.fsf_req_id = erp->fsf_req_id; + rec->u.run.rec_status = erp->status; + rec->u.run.rec_step = erp->step; + rec->u.run.rec_action = erp->action; + + if (erp->sdev) + rec->u.run.rec_count = + atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter); + else if (erp->port) + rec->u.run.rec_count = atomic_read(&erp->port->erp_counter); + else + rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter); + + debug_event(dbf->rec, level, rec, sizeof(*rec)); + spin_unlock_irqrestore(&dbf->rec_lock, flags); +} + +/** + * zfcp_dbf_rec_run - trace event related to running recovery + * @tag: identifier for event + * @erp: erp_action running + */ +void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp) +{ + zfcp_dbf_rec_run_lvl(1, tag, erp); +} + +/** + * zfcp_dbf_rec_run_wka - trace wka port event with info like running recovery + * @tag: identifier for event + * @wka_port: well known address port + * @req_id: request ID to correlate with potential HBA trace record + */ +void zfcp_dbf_rec_run_wka(char *tag, struct zfcp_fc_wka_port *wka_port, + u64 req_id) +{ + struct zfcp_dbf *dbf = wka_port->adapter->dbf; + struct zfcp_dbf_rec *rec = &dbf->rec_buf; + static int const level = 1; + unsigned long flags; + + if (unlikely(!debug_level_enabled(dbf->rec, level))) + return; + + spin_lock_irqsave(&dbf->rec_lock, flags); + memset(rec, 0, sizeof(*rec)); + + rec->id = ZFCP_DBF_REC_RUN; + memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); + rec->port_status = wka_port->status; + rec->d_id = wka_port->d_id; + rec->lun = ZFCP_DBF_INVALID_LUN; + + rec->u.run.fsf_req_id = req_id; + rec->u.run.rec_status = ~0; + rec->u.run.rec_step = ~0; + rec->u.run.rec_action = ~0; + rec->u.run.rec_count = ~0; + + debug_event(dbf->rec, level, rec, sizeof(*rec)); + spin_unlock_irqrestore(&dbf->rec_lock, flags); +} + +#define ZFCP_DBF_SAN_LEVEL 1 + +static inline +void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, + char *paytag, struct scatterlist *sg, u8 id, u16 len, + u64 req_id, u32 d_id, u16 cap_len) +{ + struct zfcp_dbf_san *rec = &dbf->san_buf; + u16 rec_len; + unsigned long flags; + struct zfcp_dbf_pay *payload = &dbf->pay_buf; + u16 pay_sum = 0; + + spin_lock_irqsave(&dbf->san_lock, flags); + memset(rec, 0, sizeof(*rec)); + + rec->id = id; + rec->fsf_req_id = req_id; + rec->d_id = d_id; + memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); + rec->pl_len = len; /* full length even if we cap pay below */ + if (!sg) + goto out; + rec_len = min_t(unsigned int, sg->length, ZFCP_DBF_SAN_MAX_PAYLOAD); + memcpy(rec->payload, sg_virt(sg), rec_len); /* part of 1st sg entry */ + if (len <= rec_len) + goto out; /* skip pay record if full content in rec->payload */ + + /* if (len > rec_len): + * dump data up to cap_len ignoring small duplicate in rec->payload + */ + spin_lock(&dbf->pay_lock); + memset(payload, 0, sizeof(*payload)); + memcpy(payload->area, paytag, ZFCP_DBF_TAG_LEN); + payload->fsf_req_id = req_id; + payload->counter = 0; + for (; sg && pay_sum < cap_len; sg = sg_next(sg)) { + u16 pay_len, offset = 0; + + while (offset < sg->length && pay_sum < cap_len) { + pay_len = min((u16)ZFCP_DBF_PAY_MAX_REC, + (u16)(sg->length - offset)); + /* cap_len <= pay_sum < cap_len+ZFCP_DBF_PAY_MAX_REC */ + memcpy(payload->data, sg_virt(sg) + offset, pay_len); + debug_event(dbf->pay, ZFCP_DBF_SAN_LEVEL, payload, + zfcp_dbf_plen(pay_len)); + payload->counter++; + offset += pay_len; + pay_sum += pay_len; + } + } + spin_unlock(&dbf->pay_lock); + +out: + debug_event(dbf->san, ZFCP_DBF_SAN_LEVEL, rec, sizeof(*rec)); + spin_unlock_irqrestore(&dbf->san_lock, flags); +} + +/** + * zfcp_dbf_san_req - trace event for issued SAN request + * @tag: identifier for event + * @fsf_req: request containing issued CT data + * d_id: destination ID + */ +void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id) +{ + struct zfcp_dbf *dbf = fsf->adapter->dbf; + struct zfcp_fsf_ct_els *ct_els = fsf->data; + u16 length; + + if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL))) + return; + + length = (u16)zfcp_qdio_real_bytes(ct_els->req); + zfcp_dbf_san(tag, dbf, "san_req", ct_els->req, ZFCP_DBF_SAN_REQ, + length, fsf->req_id, d_id, length); +} + +static u16 zfcp_dbf_san_res_cap_len_if_gpn_ft(char *tag, + struct zfcp_fsf_req *fsf, + u16 len) +{ + struct zfcp_fsf_ct_els *ct_els = fsf->data; + struct fc_ct_hdr *reqh = sg_virt(ct_els->req); + struct fc_ns_gid_ft *reqn = (struct fc_ns_gid_ft *)(reqh + 1); + struct scatterlist *resp_entry = ct_els->resp; + struct fc_ct_hdr *resph; + struct fc_gpn_ft_resp *acc; + int max_entries, x, last = 0; + + if (!(memcmp(tag, "fsscth2", 7) == 0 + && ct_els->d_id == FC_FID_DIR_SERV + && reqh->ct_rev == FC_CT_REV + && reqh->ct_in_id[0] == 0 + && reqh->ct_in_id[1] == 0 + && reqh->ct_in_id[2] == 0 + && reqh->ct_fs_type == FC_FST_DIR + && reqh->ct_fs_subtype == FC_NS_SUBTYPE + && reqh->ct_options == 0 + && reqh->_ct_resvd1 == 0 + && reqh->ct_cmd == cpu_to_be16(FC_NS_GPN_FT) + /* reqh->ct_mr_size can vary so do not match but read below */ + && reqh->_ct_resvd2 == 0 + && reqh->ct_reason == 0 + && reqh->ct_explan == 0 + && reqh->ct_vendor == 0 + && reqn->fn_resvd == 0 + && reqn->fn_domain_id_scope == 0 + && reqn->fn_area_id_scope == 0 + && reqn->fn_fc4_type == FC_TYPE_FCP)) + return len; /* not GPN_FT response so do not cap */ + + acc = sg_virt(resp_entry); + + /* cap all but accept CT responses to at least the CT header */ + resph = (struct fc_ct_hdr *)acc; + if ((ct_els->status) || + (resph->ct_cmd != cpu_to_be16(FC_FS_ACC))) + return max(FC_CT_HDR_LEN, ZFCP_DBF_SAN_MAX_PAYLOAD); + + max_entries = (be16_to_cpu(reqh->ct_mr_size) * 4 / + sizeof(struct fc_gpn_ft_resp)) + + 1 /* zfcp_fc_scan_ports: bytes correct, entries off-by-one + * to account for header as 1st pseudo "entry" */; + + /* the basic CT_IU preamble is the same size as one entry in the GPN_FT + * response, allowing us to skip special handling for it - just skip it + */ + for (x = 1; x < max_entries && !last; x++) { + if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) + acc++; + else + acc = sg_virt(++resp_entry); + + last = acc->fp_flags & FC_NS_FID_LAST; + } + len = min(len, (u16)(x * sizeof(struct fc_gpn_ft_resp))); + return len; /* cap after last entry */ +} + +/** + * zfcp_dbf_san_res - trace event for received SAN request + * @tag: identifier for event + * @fsf_req: request containing issued CT data + */ +void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf) +{ + struct zfcp_dbf *dbf = fsf->adapter->dbf; + struct zfcp_fsf_ct_els *ct_els = fsf->data; + u16 length; + + if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL))) + return; + + length = (u16)zfcp_qdio_real_bytes(ct_els->resp); + zfcp_dbf_san(tag, dbf, "san_res", ct_els->resp, ZFCP_DBF_SAN_RES, + length, fsf->req_id, ct_els->d_id, + zfcp_dbf_san_res_cap_len_if_gpn_ft(tag, fsf, length)); +} + +/** + * zfcp_dbf_san_in_els - trace event for incoming ELS + * @tag: identifier for event + * @fsf_req: request containing issued CT data + */ +void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf) +{ + struct zfcp_dbf *dbf = fsf->adapter->dbf; + struct fsf_status_read_buffer *srb = + (struct fsf_status_read_buffer *) fsf->data; + u16 length; + struct scatterlist sg; + + if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL))) + return; + + length = (u16)(srb->length - + offsetof(struct fsf_status_read_buffer, payload)); + sg_init_one(&sg, srb->payload.data, length); + zfcp_dbf_san(tag, dbf, "san_els", &sg, ZFCP_DBF_SAN_ELS, length, + fsf->req_id, ntoh24(srb->d_id), length); +} + +/** + * zfcp_dbf_scsi_common() - Common trace event helper for scsi. + * @tag: Identifier for event. + * @level: trace level of event. + * @sdev: Pointer to SCSI device as context for this event. + * @sc: Pointer to SCSI command, or NULL with task management function (TMF). + * @fsf: Pointer to FSF request, or NULL. + */ +void zfcp_dbf_scsi_common(char *tag, int level, struct scsi_device *sdev, + struct scsi_cmnd *sc, struct zfcp_fsf_req *fsf) +{ + struct zfcp_adapter *adapter = + (struct zfcp_adapter *) sdev->host->hostdata[0]; + struct zfcp_dbf *dbf = adapter->dbf; + struct zfcp_dbf_scsi *rec = &dbf->scsi_buf; + struct fcp_resp_with_ext *fcp_rsp; + struct fcp_resp_rsp_info *fcp_rsp_info; + unsigned long flags; + + spin_lock_irqsave(&dbf->scsi_lock, flags); + memset(rec, 0, sizeof(*rec)); + + memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); + rec->id = ZFCP_DBF_SCSI_CMND; + if (sc) { + rec->scsi_result = sc->result; + rec->scsi_retries = sc->retries; + rec->scsi_allowed = sc->allowed; + rec->scsi_id = sc->device->id; + rec->scsi_lun = (u32)sc->device->lun; + rec->scsi_lun_64_hi = (u32)(sc->device->lun >> 32); + rec->host_scribble = (unsigned long)sc->host_scribble; + + memcpy(rec->scsi_opcode, sc->cmnd, + min_t(int, sc->cmd_len, ZFCP_DBF_SCSI_OPCODE)); + } else { + rec->scsi_result = ~0; + rec->scsi_retries = ~0; + rec->scsi_allowed = ~0; + rec->scsi_id = sdev->id; + rec->scsi_lun = (u32)sdev->lun; + rec->scsi_lun_64_hi = (u32)(sdev->lun >> 32); + rec->host_scribble = ~0; + + memset(rec->scsi_opcode, 0xff, ZFCP_DBF_SCSI_OPCODE); + } + + if (fsf) { + rec->fsf_req_id = fsf->req_id; + rec->pl_len = FCP_RESP_WITH_EXT; + fcp_rsp = &(fsf->qtcb->bottom.io.fcp_rsp.iu); + /* mandatory parts of FCP_RSP IU in this SCSI record */ + memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT); + if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) { + fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1]; + rec->fcp_rsp_info = fcp_rsp_info->rsp_code; + rec->pl_len += be32_to_cpu(fcp_rsp->ext.fr_rsp_len); + } + if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) { + rec->pl_len += be32_to_cpu(fcp_rsp->ext.fr_sns_len); + } + /* complete FCP_RSP IU in associated PAYload record + * but only if there are optional parts + */ + if (fcp_rsp->resp.fr_flags != 0) + zfcp_dbf_pl_write( + dbf, fcp_rsp, + /* at least one full PAY record + * but not beyond hardware response field + */ + min_t(u16, max_t(u16, rec->pl_len, + ZFCP_DBF_PAY_MAX_REC), + FSF_FCP_RSP_SIZE), + "fcp_riu", fsf->req_id); + } + + debug_event(dbf->scsi, level, rec, sizeof(*rec)); + spin_unlock_irqrestore(&dbf->scsi_lock, flags); +} + +/** + * zfcp_dbf_scsi_eh() - Trace event for special cases of scsi_eh callbacks. + * @tag: Identifier for event. + * @adapter: Pointer to zfcp adapter as context for this event. + * @scsi_id: SCSI ID/target to indicate scope of task management function (TMF). + * @ret: Return value of calling function. + * + * This SCSI trace variant does not depend on any of: + * scsi_cmnd, zfcp_fsf_req, scsi_device. + */ +void zfcp_dbf_scsi_eh(char *tag, struct zfcp_adapter *adapter, + unsigned int scsi_id, int ret) +{ + struct zfcp_dbf *dbf = adapter->dbf; + struct zfcp_dbf_scsi *rec = &dbf->scsi_buf; + unsigned long flags; + static int const level = 1; + + if (unlikely(!debug_level_enabled(adapter->dbf->scsi, level))) + return; + + spin_lock_irqsave(&dbf->scsi_lock, flags); + memset(rec, 0, sizeof(*rec)); + + memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); + rec->id = ZFCP_DBF_SCSI_CMND; + rec->scsi_result = ret; /* re-use field, int is 4 bytes and fits */ + rec->scsi_retries = ~0; + rec->scsi_allowed = ~0; + rec->fcp_rsp_info = ~0; + rec->scsi_id = scsi_id; + rec->scsi_lun = (u32)ZFCP_DBF_INVALID_LUN; + rec->scsi_lun_64_hi = (u32)(ZFCP_DBF_INVALID_LUN >> 32); + rec->host_scribble = ~0; + memset(rec->scsi_opcode, 0xff, ZFCP_DBF_SCSI_OPCODE); + + debug_event(dbf->scsi, level, rec, sizeof(*rec)); + spin_unlock_irqrestore(&dbf->scsi_lock, flags); +} + +static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size) +{ + struct debug_info *d; + + d = debug_register(name, size, 1, rec_size); + if (!d) + return NULL; + + debug_register_view(d, &debug_hex_ascii_view); + debug_set_level(d, dbflevel); + + return d; +} + +static void zfcp_dbf_unregister(struct zfcp_dbf *dbf) +{ + if (!dbf) + return; + + debug_unregister(dbf->scsi); + debug_unregister(dbf->san); + debug_unregister(dbf->hba); + debug_unregister(dbf->pay); + debug_unregister(dbf->rec); + kfree(dbf); +} + +/** + * zfcp_adapter_debug_register - registers debug feature for an adapter + * @adapter: pointer to adapter for which debug features should be registered + * return: -ENOMEM on error, 0 otherwise + */ +int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter) +{ + char name[DEBUG_MAX_NAME_LEN]; + struct zfcp_dbf *dbf; + + dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL); + if (!dbf) + return -ENOMEM; + + spin_lock_init(&dbf->pay_lock); + spin_lock_init(&dbf->hba_lock); + spin_lock_init(&dbf->san_lock); + spin_lock_init(&dbf->scsi_lock); + spin_lock_init(&dbf->rec_lock); + + /* debug feature area which records recovery activity */ + sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev)); + dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec)); + if (!dbf->rec) + goto err_out; + + /* debug feature area which records HBA (FSF and QDIO) conditions */ + sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev)); + dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba)); + if (!dbf->hba) + goto err_out; + + /* debug feature area which records payload info */ + sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev)); + dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay)); + if (!dbf->pay) + goto err_out; + + /* debug feature area which records SAN command failures and recovery */ + sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev)); + dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san)); + if (!dbf->san) + goto err_out; + + /* debug feature area which records SCSI command failures and recovery */ + sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev)); + dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi)); + if (!dbf->scsi) + goto err_out; + + adapter->dbf = dbf; + + return 0; +err_out: + zfcp_dbf_unregister(dbf); + return -ENOMEM; +} + +/** + * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter + * @adapter: pointer to adapter for which debug features should be unregistered + */ +void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter) +{ + struct zfcp_dbf *dbf = adapter->dbf; + + adapter->dbf = NULL; + zfcp_dbf_unregister(dbf); +} + diff --git a/drivers/s390/scsi/zfcp_dbf.h b/drivers/s390/scsi/zfcp_dbf.h new file mode 100644 index 000000000..d116c07ed --- /dev/null +++ b/drivers/s390/scsi/zfcp_dbf.h @@ -0,0 +1,443 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * zfcp device driver + * debug feature declarations + * + * Copyright IBM Corp. 2008, 2017 + */ + +#ifndef ZFCP_DBF_H +#define ZFCP_DBF_H + +#include +#include "zfcp_ext.h" +#include "zfcp_fsf.h" +#include "zfcp_def.h" + +#define ZFCP_DBF_TAG_LEN 7 + +#define ZFCP_DBF_INVALID_LUN 0xFFFFFFFFFFFFFFFFull + +enum zfcp_dbf_pseudo_erp_act_type { + ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD = 0xff, + ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL = 0xfe, +}; + +/** + * struct zfcp_dbf_rec_trigger - trace record for triggered recovery action + * @ready: number of ready recovery actions + * @running: number of running recovery actions + * @want: wanted recovery action + * @need: needed recovery action + */ +struct zfcp_dbf_rec_trigger { + u32 ready; + u32 running; + u8 want; + u8 need; +} __packed; + +/** + * struct zfcp_dbf_rec_running - trace record for running recovery + * @fsf_req_id: request id for fsf requests + * @rec_status: status of the fsf request + * @rec_step: current step of the recovery action + * rec_count: recovery counter + */ +struct zfcp_dbf_rec_running { + u64 fsf_req_id; + u32 rec_status; + u16 rec_step; + u8 rec_action; + u8 rec_count; +} __packed; + +/** + * enum zfcp_dbf_rec_id - recovery trace record id + * @ZFCP_DBF_REC_TRIG: triggered recovery identifier + * @ZFCP_DBF_REC_RUN: running recovery identifier + */ +enum zfcp_dbf_rec_id { + ZFCP_DBF_REC_TRIG = 1, + ZFCP_DBF_REC_RUN = 2, +}; + +/** + * struct zfcp_dbf_rec - trace record for error recovery actions + * @id: unique number of recovery record type + * @tag: identifier string specifying the location of initiation + * @lun: logical unit number + * @wwpn: word wide port number + * @d_id: destination ID + * @adapter_status: current status of the adapter + * @port_status: current status of the port + * @lun_status: current status of the lun + * @u.trig: structure zfcp_dbf_rec_trigger + * @u.run: structure zfcp_dbf_rec_running + */ +struct zfcp_dbf_rec { + u8 id; + char tag[ZFCP_DBF_TAG_LEN]; + u64 lun; + u64 wwpn; + u32 d_id; + u32 adapter_status; + u32 port_status; + u32 lun_status; + union { + struct zfcp_dbf_rec_trigger trig; + struct zfcp_dbf_rec_running run; + } u; +} __packed; + +/** + * enum zfcp_dbf_san_id - SAN trace record identifier + * @ZFCP_DBF_SAN_REQ: request trace record id + * @ZFCP_DBF_SAN_RES: response trace record id + * @ZFCP_DBF_SAN_ELS: extended link service record id + */ +enum zfcp_dbf_san_id { + ZFCP_DBF_SAN_REQ = 1, + ZFCP_DBF_SAN_RES = 2, + ZFCP_DBF_SAN_ELS = 3, +}; + +/** struct zfcp_dbf_san - trace record for SAN requests and responses + * @id: unique number of recovery record type + * @tag: identifier string specifying the location of initiation + * @fsf_req_id: request id for fsf requests + * @payload: unformatted information related to request/response + * @d_id: destination id + */ +struct zfcp_dbf_san { + u8 id; + char tag[ZFCP_DBF_TAG_LEN]; + u64 fsf_req_id; + u32 d_id; +#define ZFCP_DBF_SAN_MAX_PAYLOAD (FC_CT_HDR_LEN + 32) + char payload[ZFCP_DBF_SAN_MAX_PAYLOAD]; + u16 pl_len; +} __packed; + +/** + * struct zfcp_dbf_hba_res - trace record for hba responses + * @req_issued: timestamp when request was issued + * @prot_status: protocol status + * @prot_status_qual: protocol status qualifier + * @fsf_status: fsf status + * @fsf_status_qual: fsf status qualifier + */ +struct zfcp_dbf_hba_res { + u64 req_issued; + u32 prot_status; + u8 prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE]; + u32 fsf_status; + u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE]; + u32 port_handle; + u32 lun_handle; +} __packed; + +/** + * struct zfcp_dbf_hba_uss - trace record for unsolicited status + * @status_type: type of unsolicited status + * @status_subtype: subtype of unsolicited status + * @d_id: destination ID + * @lun: logical unit number + * @queue_designator: queue designator + */ +struct zfcp_dbf_hba_uss { + u32 status_type; + u32 status_subtype; + u32 d_id; + u64 lun; + u64 queue_designator; +} __packed; + +/** + * enum zfcp_dbf_hba_id - HBA trace record identifier + * @ZFCP_DBF_HBA_RES: response trace record + * @ZFCP_DBF_HBA_USS: unsolicited status trace record + * @ZFCP_DBF_HBA_BIT: bit error trace record + */ +enum zfcp_dbf_hba_id { + ZFCP_DBF_HBA_RES = 1, + ZFCP_DBF_HBA_USS = 2, + ZFCP_DBF_HBA_BIT = 3, + ZFCP_DBF_HBA_BASIC = 4, +}; + +/** + * struct zfcp_dbf_hba - common trace record for HBA records + * @id: unique number of recovery record type + * @tag: identifier string specifying the location of initiation + * @fsf_req_id: request id for fsf requests + * @fsf_req_status: status of fsf request + * @fsf_cmd: fsf command + * @fsf_seq_no: fsf sequence number + * @pl_len: length of payload stored as zfcp_dbf_pay + * @u: record type specific data + */ +struct zfcp_dbf_hba { + u8 id; + char tag[ZFCP_DBF_TAG_LEN]; + u64 fsf_req_id; + u32 fsf_req_status; + u32 fsf_cmd; + u32 fsf_seq_no; + u16 pl_len; + union { + struct zfcp_dbf_hba_res res; + struct zfcp_dbf_hba_uss uss; + struct fsf_bit_error_payload be; + } u; +} __packed; + +/** + * enum zfcp_dbf_scsi_id - scsi trace record identifier + * @ZFCP_DBF_SCSI_CMND: scsi command trace record + */ +enum zfcp_dbf_scsi_id { + ZFCP_DBF_SCSI_CMND = 1, +}; + +/** + * struct zfcp_dbf_scsi - common trace record for SCSI records + * @id: unique number of recovery record type + * @tag: identifier string specifying the location of initiation + * @scsi_id: scsi device id + * @scsi_lun: scsi device logical unit number, low part of 64 bit, old 32 bit + * @scsi_result: scsi result + * @scsi_retries: current retry number of scsi request + * @scsi_allowed: allowed retries + * @fcp_rsp_info: FCP response info code + * @scsi_opcode: scsi opcode + * @fsf_req_id: request id of fsf request + * @host_scribble: LLD specific data attached to SCSI request + * @pl_len: length of payload stored as zfcp_dbf_pay + * @fcp_rsp: response for FCP request + * @scsi_lun_64_hi: scsi device logical unit number, high part of 64 bit + */ +struct zfcp_dbf_scsi { + u8 id; + char tag[ZFCP_DBF_TAG_LEN]; + u32 scsi_id; + u32 scsi_lun; + u32 scsi_result; + u8 scsi_retries; + u8 scsi_allowed; + u8 fcp_rsp_info; +#define ZFCP_DBF_SCSI_OPCODE 16 + u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE]; + u64 fsf_req_id; + u64 host_scribble; + u16 pl_len; + struct fcp_resp_with_ext fcp_rsp; + u32 scsi_lun_64_hi; +} __packed; + +/** + * struct zfcp_dbf_pay - trace record for unformatted payload information + * @area: area this record is originated from + * @counter: ascending record number + * @fsf_req_id: request id of fsf request + * @data: unformatted data + */ +struct zfcp_dbf_pay { + u8 counter; + char area[ZFCP_DBF_TAG_LEN]; + u64 fsf_req_id; +#define ZFCP_DBF_PAY_MAX_REC 0x100 + char data[ZFCP_DBF_PAY_MAX_REC]; +} __packed; + +/** + * struct zfcp_dbf - main dbf trace structure + * @pay: reference to payload trace area + * @rec: reference to recovery trace area + * @hba: reference to hba trace area + * @san: reference to san trace area + * @scsi: reference to scsi trace area + * @pay_lock: lock protecting payload trace buffer + * @rec_lock: lock protecting recovery trace buffer + * @hba_lock: lock protecting hba trace buffer + * @san_lock: lock protecting san trace buffer + * @scsi_lock: lock protecting scsi trace buffer + * @pay_buf: pre-allocated buffer for payload + * @rec_buf: pre-allocated buffer for recovery + * @hba_buf: pre-allocated buffer for hba + * @san_buf: pre-allocated buffer for san + * @scsi_buf: pre-allocated buffer for scsi + */ +struct zfcp_dbf { + debug_info_t *pay; + debug_info_t *rec; + debug_info_t *hba; + debug_info_t *san; + debug_info_t *scsi; + spinlock_t pay_lock; + spinlock_t rec_lock; + spinlock_t hba_lock; + spinlock_t san_lock; + spinlock_t scsi_lock; + struct zfcp_dbf_pay pay_buf; + struct zfcp_dbf_rec rec_buf; + struct zfcp_dbf_hba hba_buf; + struct zfcp_dbf_san san_buf; + struct zfcp_dbf_scsi scsi_buf; +}; + +/** + * zfcp_dbf_hba_fsf_resp_suppress - true if we should not trace by default + * @req: request that has been completed + * + * Returns true if FCP response with only benign residual under count. + */ +static inline +bool zfcp_dbf_hba_fsf_resp_suppress(struct zfcp_fsf_req *req) +{ + struct fsf_qtcb *qtcb = req->qtcb; + u32 fsf_stat = qtcb->header.fsf_status; + struct fcp_resp *fcp_rsp; + u8 rsp_flags, fr_status; + + if (qtcb->prefix.qtcb_type != FSF_IO_COMMAND) + return false; /* not an FCP response */ + fcp_rsp = &qtcb->bottom.io.fcp_rsp.iu.resp; + rsp_flags = fcp_rsp->fr_flags; + fr_status = fcp_rsp->fr_status; + return (fsf_stat == FSF_FCP_RSP_AVAILABLE) && + (rsp_flags == FCP_RESID_UNDER) && + (fr_status == SAM_STAT_GOOD); +} + +static inline +void zfcp_dbf_hba_fsf_resp(char *tag, int level, struct zfcp_fsf_req *req) +{ + if (debug_level_enabled(req->adapter->dbf->hba, level)) + zfcp_dbf_hba_fsf_res(tag, level, req); +} + +/** + * zfcp_dbf_hba_fsf_response - trace event for request completion + * @req: request that has been completed + */ +static inline +void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req) +{ + struct fsf_qtcb *qtcb = req->qtcb; + + if (unlikely(req->status & (ZFCP_STATUS_FSFREQ_DISMISSED | + ZFCP_STATUS_FSFREQ_ERROR))) { + zfcp_dbf_hba_fsf_resp("fs_rerr", 3, req); + + } else if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) && + (qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) { + zfcp_dbf_hba_fsf_resp("fs_perr", 1, req); + + } else if (qtcb->header.fsf_status != FSF_GOOD) { + zfcp_dbf_hba_fsf_resp("fs_ferr", + zfcp_dbf_hba_fsf_resp_suppress(req) + ? 5 : 1, req); + + } else if ((req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) || + (req->fsf_command == FSF_QTCB_OPEN_LUN)) { + zfcp_dbf_hba_fsf_resp("fs_open", 4, req); + + } else if (qtcb->header.log_length) { + zfcp_dbf_hba_fsf_resp("fs_qtcb", 5, req); + + } else { + zfcp_dbf_hba_fsf_resp("fs_norm", 6, req); + } +} + +static inline +void _zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *scmd, + struct zfcp_fsf_req *req) +{ + struct zfcp_adapter *adapter = (struct zfcp_adapter *) + scmd->device->host->hostdata[0]; + + if (debug_level_enabled(adapter->dbf->scsi, level)) + zfcp_dbf_scsi_common(tag, level, scmd->device, scmd, req); +} + +/** + * zfcp_dbf_scsi_result - trace event for SCSI command completion + * @scmd: SCSI command pointer + * @req: FSF request used to issue SCSI command + */ +static inline +void zfcp_dbf_scsi_result(struct scsi_cmnd *scmd, struct zfcp_fsf_req *req) +{ + if (scmd->result != 0) + _zfcp_dbf_scsi("rsl_err", 3, scmd, req); + else if (scmd->retries > 0) + _zfcp_dbf_scsi("rsl_ret", 4, scmd, req); + else + _zfcp_dbf_scsi("rsl_nor", 6, scmd, req); +} + +/** + * zfcp_dbf_scsi_fail_send - trace event for failure to send SCSI command + * @scmd: SCSI command pointer + */ +static inline +void zfcp_dbf_scsi_fail_send(struct scsi_cmnd *scmd) +{ + _zfcp_dbf_scsi("rsl_fai", 4, scmd, NULL); +} + +/** + * zfcp_dbf_scsi_abort - trace event for SCSI command abort + * @tag: tag indicating success or failure of abort operation + * @scmd: SCSI command to be aborted + * @fsf_req: request containing abort (might be NULL) + */ +static inline +void zfcp_dbf_scsi_abort(char *tag, struct scsi_cmnd *scmd, + struct zfcp_fsf_req *fsf_req) +{ + _zfcp_dbf_scsi(tag, 1, scmd, fsf_req); +} + +/** + * zfcp_dbf_scsi_devreset() - Trace event for Logical Unit or Target Reset. + * @tag: Tag indicating success or failure of reset operation. + * @sdev: Pointer to SCSI device as context for this event. + * @flag: Indicates type of reset (Target Reset, Logical Unit Reset). + * @fsf_req: Pointer to FSF request representing the TMF, or NULL. + */ +static inline +void zfcp_dbf_scsi_devreset(char *tag, struct scsi_device *sdev, u8 flag, + struct zfcp_fsf_req *fsf_req) +{ + struct zfcp_adapter *adapter = (struct zfcp_adapter *) + sdev->host->hostdata[0]; + char tmp_tag[ZFCP_DBF_TAG_LEN]; + static int const level = 1; + + if (unlikely(!debug_level_enabled(adapter->dbf->scsi, level))) + return; + + if (flag == FCP_TMF_TGT_RESET) + memcpy(tmp_tag, "tr_", 3); + else + memcpy(tmp_tag, "lr_", 3); + + memcpy(&tmp_tag[3], tag, 4); + zfcp_dbf_scsi_common(tmp_tag, level, sdev, NULL, fsf_req); +} + +/** + * zfcp_dbf_scsi_nullcmnd() - trace NULLify of SCSI command in dev/tgt-reset. + * @scmnd: SCSI command that was NULLified. + * @fsf_req: request that owned @scmnd. + */ +static inline void zfcp_dbf_scsi_nullcmnd(struct scsi_cmnd *scmnd, + struct zfcp_fsf_req *fsf_req) +{ + _zfcp_dbf_scsi("scfc__1", 3, scmnd, fsf_req); +} + +#endif /* ZFCP_DBF_H */ diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h new file mode 100644 index 000000000..3396a4772 --- /dev/null +++ b/drivers/s390/scsi/zfcp_def.h @@ -0,0 +1,324 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * zfcp device driver + * + * Global definitions for the zfcp device driver. + * + * Copyright IBM Corp. 2002, 2010 + */ + +#ifndef ZFCP_DEF_H +#define ZFCP_DEF_H + +/*************************** INCLUDES *****************************************/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "zfcp_fsf.h" +#include "zfcp_fc.h" +#include "zfcp_qdio.h" + +struct zfcp_reqlist; + +/********************* SCSI SPECIFIC DEFINES *********************************/ +#define ZFCP_SCSI_ER_TIMEOUT (10*HZ) + +/********************* FSF SPECIFIC DEFINES *********************************/ + +/* ATTENTION: value must not be used by hardware */ +#define FSF_QTCB_UNSOLICITED_STATUS 0x6305 + +/* timeout value for "default timer" for fsf requests */ +#define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ) + +/*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/ + +/* + * Note, the leftmost status byte is common among adapter, port + * and unit + */ +#define ZFCP_COMMON_FLAGS 0xfff00000 + +/* common status bits */ +#define ZFCP_STATUS_COMMON_RUNNING 0x40000000 +#define ZFCP_STATUS_COMMON_ERP_FAILED 0x20000000 +#define ZFCP_STATUS_COMMON_UNBLOCKED 0x10000000 +#define ZFCP_STATUS_COMMON_OPEN 0x04000000 +#define ZFCP_STATUS_COMMON_ERP_INUSE 0x01000000 +#define ZFCP_STATUS_COMMON_ACCESS_DENIED 0x00800000 +#define ZFCP_STATUS_COMMON_ACCESS_BOXED 0x00400000 +#define ZFCP_STATUS_COMMON_NOESC 0x00200000 + +/* adapter status */ +#define ZFCP_STATUS_ADAPTER_MB_ACT 0x00000001 +#define ZFCP_STATUS_ADAPTER_QDIOUP 0x00000002 +#define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED 0x00000004 +#define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008 +#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT 0x00000010 +#define ZFCP_STATUS_ADAPTER_SUSPENDED 0x00000040 +#define ZFCP_STATUS_ADAPTER_ERP_PENDING 0x00000100 +#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200 +#define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED 0x00000400 + +/* remote port status */ +#define ZFCP_STATUS_PORT_PHYS_OPEN 0x00000001 +#define ZFCP_STATUS_PORT_LINK_TEST 0x00000002 + +/* FSF request status (this does not have a common part) */ +#define ZFCP_STATUS_FSFREQ_ERROR 0x00000008 +#define ZFCP_STATUS_FSFREQ_CLEANUP 0x00000010 +#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED 0x00000040 +#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080 +#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200 +#define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000 + +/************************* STRUCTURE DEFINITIONS *****************************/ + +struct zfcp_fsf_req; + +/* holds various memory pools of an adapter */ +struct zfcp_adapter_mempool { + mempool_t *erp_req; + mempool_t *gid_pn_req; + mempool_t *scsi_req; + mempool_t *scsi_abort; + mempool_t *status_read_req; + mempool_t *sr_data; + mempool_t *gid_pn; + mempool_t *qtcb_pool; +}; + +struct zfcp_erp_action { + struct list_head list; + int action; /* requested action code */ + struct zfcp_adapter *adapter; /* device which should be recovered */ + struct zfcp_port *port; + struct scsi_device *sdev; + u32 status; /* recovery status */ + u32 step; /* active step of this erp action */ + unsigned long fsf_req_id; + struct timer_list timer; +}; + +struct fsf_latency_record { + u32 min; + u32 max; + u64 sum; +}; + +struct latency_cont { + struct fsf_latency_record channel; + struct fsf_latency_record fabric; + u64 counter; +}; + +struct zfcp_latencies { + struct latency_cont read; + struct latency_cont write; + struct latency_cont cmd; + spinlock_t lock; +}; + +struct zfcp_adapter { + struct kref ref; + u64 peer_wwnn; /* P2P peer WWNN */ + u64 peer_wwpn; /* P2P peer WWPN */ + u32 peer_d_id; /* P2P peer D_ID */ + struct ccw_device *ccw_device; /* S/390 ccw device */ + struct zfcp_qdio *qdio; + u32 hydra_version; /* Hydra version */ + u32 fsf_lic_version; + u32 adapter_features; /* FCP channel features */ + u32 connection_features; /* host connection features */ + u32 hardware_version; /* of FCP channel */ + u16 timer_ticks; /* time int for a tick */ + struct Scsi_Host *scsi_host; /* Pointer to mid-layer */ + struct list_head port_list; /* remote port list */ + rwlock_t port_list_lock; /* port list lock */ + unsigned long req_no; /* unique FSF req number */ + struct zfcp_reqlist *req_list; + u32 fsf_req_seq_no; /* FSF cmnd seq number */ + rwlock_t abort_lock; /* Protects against SCSI + stack abort/command + completion races */ + atomic_t stat_miss; /* # missing status reads*/ + unsigned int stat_read_buf_num; + struct work_struct stat_work; + atomic_t status; /* status of this adapter */ + struct list_head erp_ready_head; /* error recovery for this + adapter/devices */ + wait_queue_head_t erp_ready_wq; + struct list_head erp_running_head; + rwlock_t erp_lock; + wait_queue_head_t erp_done_wqh; + struct zfcp_erp_action erp_action; /* pending error recovery */ + atomic_t erp_counter; + u32 erp_total_count; /* total nr of enqueued erp + actions */ + u32 erp_low_mem_count; /* nr of erp actions waiting + for memory */ + struct task_struct *erp_thread; + struct zfcp_fc_wka_ports *gs; /* generic services */ + struct zfcp_dbf *dbf; /* debug traces */ + struct zfcp_adapter_mempool pool; /* Adapter memory pools */ + struct fc_host_statistics *fc_stats; + struct fsf_qtcb_bottom_port *stats_reset_data; + unsigned long stats_reset; + struct delayed_work scan_work; + struct work_struct ns_up_work; + struct service_level service_level; + struct workqueue_struct *work_queue; + struct device_dma_parameters dma_parms; + struct zfcp_fc_events events; + unsigned long next_port_scan; +}; + +struct zfcp_port { + struct device dev; + struct fc_rport *rport; /* rport of fc transport class */ + struct list_head list; /* list of remote ports */ + struct zfcp_adapter *adapter; /* adapter used to access port */ + struct list_head unit_list; /* head of logical unit list */ + rwlock_t unit_list_lock; /* unit list lock */ + atomic_t units; /* zfcp_unit count */ + atomic_t status; /* status of this remote port */ + u64 wwnn; /* WWNN if known */ + u64 wwpn; /* WWPN */ + u32 d_id; /* D_ID */ + u32 handle; /* handle assigned by FSF */ + struct zfcp_erp_action erp_action; /* pending error recovery */ + atomic_t erp_counter; + u32 maxframe_size; + u32 supported_classes; + struct work_struct gid_pn_work; + struct work_struct test_link_work; + struct work_struct rport_work; + enum { RPORT_NONE, RPORT_ADD, RPORT_DEL } rport_task; + unsigned int starget_id; +}; + +/** + * struct zfcp_unit - LUN configured via zfcp sysfs + * @dev: struct device for sysfs representation and reference counting + * @list: entry in LUN/unit list per zfcp_port + * @port: reference to zfcp_port where this LUN is configured + * @fcp_lun: 64 bit LUN value + * @scsi_work: for running scsi_scan_target + * + * This is the representation of a LUN that has been configured for + * usage. The main data here is the 64 bit LUN value, data for + * running I/O and recovery is in struct zfcp_scsi_dev. + */ +struct zfcp_unit { + struct device dev; + struct list_head list; + struct zfcp_port *port; + u64 fcp_lun; + struct work_struct scsi_work; +}; + +/** + * struct zfcp_scsi_dev - zfcp data per SCSI device + * @status: zfcp internal status flags + * @lun_handle: handle from "open lun" for issuing FSF requests + * @erp_action: zfcp erp data for opening and recovering this LUN + * @erp_counter: zfcp erp counter for this LUN + * @latencies: FSF channel and fabric latencies + * @port: zfcp_port where this LUN belongs to + */ +struct zfcp_scsi_dev { + atomic_t status; + u32 lun_handle; + struct zfcp_erp_action erp_action; + atomic_t erp_counter; + struct zfcp_latencies latencies; + struct zfcp_port *port; +}; + +/** + * sdev_to_zfcp - Access zfcp LUN data for SCSI device + * @sdev: scsi_device where to get the zfcp_scsi_dev pointer + */ +static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev) +{ + return scsi_transport_device_data(sdev); +} + +/** + * zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN + * @sdev: SCSI device where to get the LUN from + */ +static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev) +{ + u64 fcp_lun; + + int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun); + return fcp_lun; +} + +/** + * struct zfcp_fsf_req - basic FSF request structure + * @list: list of FSF requests + * @req_id: unique request ID + * @adapter: adapter this request belongs to + * @qdio_req: qdio queue related values + * @completion: used to signal the completion of the request + * @status: status of the request + * @fsf_command: FSF command issued + * @qtcb: associated QTCB + * @seq_no: sequence number of this request + * @data: private data + * @timer: timer data of this request + * @erp_action: reference to erp action if request issued on behalf of ERP + * @pool: reference to memory pool if used for this request + * @issued: time when request was send (STCK) + * @handler: handler which should be called to process response + */ +struct zfcp_fsf_req { + struct list_head list; + unsigned long req_id; + struct zfcp_adapter *adapter; + struct zfcp_qdio_req qdio_req; + struct completion completion; + u32 status; + u32 fsf_command; + struct fsf_qtcb *qtcb; + u32 seq_no; + void *data; + struct timer_list timer; + struct zfcp_erp_action *erp_action; + mempool_t *pool; + unsigned long long issued; + void (*handler)(struct zfcp_fsf_req *); +}; + +static inline +int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter) +{ + return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT; +} + +#endif /* ZFCP_DEF_H */ diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c new file mode 100644 index 000000000..b7afdb55a --- /dev/null +++ b/drivers/s390/scsi/zfcp_erp.c @@ -0,0 +1,1734 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * Error Recovery Procedures (ERP). + * + * Copyright IBM Corp. 2002, 2016 + */ + +#define KMSG_COMPONENT "zfcp" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include "zfcp_ext.h" +#include "zfcp_reqlist.h" + +#define ZFCP_MAX_ERPS 3 + +enum zfcp_erp_act_flags { + ZFCP_STATUS_ERP_TIMEDOUT = 0x10000000, + ZFCP_STATUS_ERP_CLOSE_ONLY = 0x01000000, + ZFCP_STATUS_ERP_DISMISSED = 0x00200000, + ZFCP_STATUS_ERP_LOWMEM = 0x00400000, + ZFCP_STATUS_ERP_NO_REF = 0x00800000, +}; + +enum zfcp_erp_steps { + ZFCP_ERP_STEP_UNINITIALIZED = 0x0000, + ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010, + ZFCP_ERP_STEP_PORT_CLOSING = 0x0100, + ZFCP_ERP_STEP_PORT_OPENING = 0x0800, + ZFCP_ERP_STEP_LUN_CLOSING = 0x1000, + ZFCP_ERP_STEP_LUN_OPENING = 0x2000, +}; + +/** + * enum zfcp_erp_act_type - Type of ERP action object. + * @ZFCP_ERP_ACTION_REOPEN_LUN: LUN recovery. + * @ZFCP_ERP_ACTION_REOPEN_PORT: Port recovery. + * @ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: Forced port recovery. + * @ZFCP_ERP_ACTION_REOPEN_ADAPTER: Adapter recovery. + * @ZFCP_ERP_ACTION_NONE: Eyecatcher pseudo flag to bitwise or-combine with + * either of the first four enum values. + * Used to indicate that an ERP action could not be + * set up despite a detected need for some recovery. + * @ZFCP_ERP_ACTION_FAILED: Eyecatcher pseudo flag to bitwise or-combine with + * either of the first four enum values. + * Used to indicate that ERP not needed because + * the object has ZFCP_STATUS_COMMON_ERP_FAILED. + */ +enum zfcp_erp_act_type { + ZFCP_ERP_ACTION_REOPEN_LUN = 1, + ZFCP_ERP_ACTION_REOPEN_PORT = 2, + ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3, + ZFCP_ERP_ACTION_REOPEN_ADAPTER = 4, + ZFCP_ERP_ACTION_NONE = 0xc0, + ZFCP_ERP_ACTION_FAILED = 0xe0, +}; + +enum zfcp_erp_act_result { + ZFCP_ERP_SUCCEEDED = 0, + ZFCP_ERP_FAILED = 1, + ZFCP_ERP_CONTINUES = 2, + ZFCP_ERP_EXIT = 3, + ZFCP_ERP_DISMISSED = 4, + ZFCP_ERP_NOMEM = 5, +}; + +static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask) +{ + zfcp_erp_clear_adapter_status(adapter, + ZFCP_STATUS_COMMON_UNBLOCKED | mask); +} + +static bool zfcp_erp_action_is_running(struct zfcp_erp_action *act) +{ + struct zfcp_erp_action *curr_act; + + list_for_each_entry(curr_act, &act->adapter->erp_running_head, list) + if (act == curr_act) + return true; + return false; +} + +static void zfcp_erp_action_ready(struct zfcp_erp_action *act) +{ + struct zfcp_adapter *adapter = act->adapter; + + list_move(&act->list, &act->adapter->erp_ready_head); + zfcp_dbf_rec_run("erardy1", act); + wake_up(&adapter->erp_ready_wq); + zfcp_dbf_rec_run("erardy2", act); +} + +static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act) +{ + act->status |= ZFCP_STATUS_ERP_DISMISSED; + if (zfcp_erp_action_is_running(act)) + zfcp_erp_action_ready(act); +} + +static void zfcp_erp_action_dismiss_lun(struct scsi_device *sdev) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + + if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_INUSE) + zfcp_erp_action_dismiss(&zfcp_sdev->erp_action); +} + +static void zfcp_erp_action_dismiss_port(struct zfcp_port *port) +{ + struct scsi_device *sdev; + + if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE) + zfcp_erp_action_dismiss(&port->erp_action); + else { + spin_lock(port->adapter->scsi_host->host_lock); + __shost_for_each_device(sdev, port->adapter->scsi_host) + if (sdev_to_zfcp(sdev)->port == port) + zfcp_erp_action_dismiss_lun(sdev); + spin_unlock(port->adapter->scsi_host->host_lock); + } +} + +static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter) +{ + struct zfcp_port *port; + + if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE) + zfcp_erp_action_dismiss(&adapter->erp_action); + else { + read_lock(&adapter->port_list_lock); + list_for_each_entry(port, &adapter->port_list, list) + zfcp_erp_action_dismiss_port(port); + read_unlock(&adapter->port_list_lock); + } +} + +static int zfcp_erp_handle_failed(int want, struct zfcp_adapter *adapter, + struct zfcp_port *port, + struct scsi_device *sdev) +{ + int need = want; + struct zfcp_scsi_dev *zsdev; + + switch (want) { + case ZFCP_ERP_ACTION_REOPEN_LUN: + zsdev = sdev_to_zfcp(sdev); + if (atomic_read(&zsdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) + need = 0; + break; + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) + need = 0; + break; + case ZFCP_ERP_ACTION_REOPEN_PORT: + if (atomic_read(&port->status) & + ZFCP_STATUS_COMMON_ERP_FAILED) { + need = 0; + /* ensure propagation of failed status to new devices */ + zfcp_erp_set_port_status( + port, ZFCP_STATUS_COMMON_ERP_FAILED); + } + break; + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + if (atomic_read(&adapter->status) & + ZFCP_STATUS_COMMON_ERP_FAILED) { + need = 0; + /* ensure propagation of failed status to new devices */ + zfcp_erp_set_adapter_status( + adapter, ZFCP_STATUS_COMMON_ERP_FAILED); + } + break; + } + + return need; +} + +static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter, + struct zfcp_port *port, + struct scsi_device *sdev) +{ + int need = want; + int l_status, p_status, a_status; + struct zfcp_scsi_dev *zfcp_sdev; + + switch (want) { + case ZFCP_ERP_ACTION_REOPEN_LUN: + zfcp_sdev = sdev_to_zfcp(sdev); + l_status = atomic_read(&zfcp_sdev->status); + if (l_status & ZFCP_STATUS_COMMON_ERP_INUSE) + return 0; + p_status = atomic_read(&port->status); + if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) || + p_status & ZFCP_STATUS_COMMON_ERP_FAILED) + return 0; + if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED)) + need = ZFCP_ERP_ACTION_REOPEN_PORT; + /* fall through */ + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + p_status = atomic_read(&port->status); + if (!(p_status & ZFCP_STATUS_COMMON_OPEN)) + need = ZFCP_ERP_ACTION_REOPEN_PORT; + /* fall through */ + case ZFCP_ERP_ACTION_REOPEN_PORT: + p_status = atomic_read(&port->status); + if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE) + return 0; + a_status = atomic_read(&adapter->status); + if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) || + a_status & ZFCP_STATUS_COMMON_ERP_FAILED) + return 0; + if (p_status & ZFCP_STATUS_COMMON_NOESC) + return need; + if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED)) + need = ZFCP_ERP_ACTION_REOPEN_ADAPTER; + /* fall through */ + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + a_status = atomic_read(&adapter->status); + if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE) + return 0; + if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) && + !(a_status & ZFCP_STATUS_COMMON_OPEN)) + return 0; /* shutdown requested for closed adapter */ + } + + return need; +} + +static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status, + struct zfcp_adapter *adapter, + struct zfcp_port *port, + struct scsi_device *sdev) +{ + struct zfcp_erp_action *erp_action; + struct zfcp_scsi_dev *zfcp_sdev; + + if (WARN_ON_ONCE(need != ZFCP_ERP_ACTION_REOPEN_LUN && + need != ZFCP_ERP_ACTION_REOPEN_PORT && + need != ZFCP_ERP_ACTION_REOPEN_PORT_FORCED && + need != ZFCP_ERP_ACTION_REOPEN_ADAPTER)) + return NULL; + + switch (need) { + case ZFCP_ERP_ACTION_REOPEN_LUN: + zfcp_sdev = sdev_to_zfcp(sdev); + if (!(act_status & ZFCP_STATUS_ERP_NO_REF)) + if (scsi_device_get(sdev)) + return NULL; + atomic_or(ZFCP_STATUS_COMMON_ERP_INUSE, + &zfcp_sdev->status); + erp_action = &zfcp_sdev->erp_action; + WARN_ON_ONCE(erp_action->port != port); + WARN_ON_ONCE(erp_action->sdev != sdev); + if (!(atomic_read(&zfcp_sdev->status) & + ZFCP_STATUS_COMMON_RUNNING)) + act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY; + break; + + case ZFCP_ERP_ACTION_REOPEN_PORT: + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + if (!get_device(&port->dev)) + return NULL; + zfcp_erp_action_dismiss_port(port); + atomic_or(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status); + erp_action = &port->erp_action; + WARN_ON_ONCE(erp_action->port != port); + WARN_ON_ONCE(erp_action->sdev != NULL); + if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING)) + act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY; + break; + + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + kref_get(&adapter->ref); + zfcp_erp_action_dismiss_adapter(adapter); + atomic_or(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status); + erp_action = &adapter->erp_action; + WARN_ON_ONCE(erp_action->port != NULL); + WARN_ON_ONCE(erp_action->sdev != NULL); + if (!(atomic_read(&adapter->status) & + ZFCP_STATUS_COMMON_RUNNING)) + act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY; + break; + + default: + return NULL; + } + + WARN_ON_ONCE(erp_action->adapter != adapter); + memset(&erp_action->list, 0, sizeof(erp_action->list)); + memset(&erp_action->timer, 0, sizeof(erp_action->timer)); + erp_action->step = ZFCP_ERP_STEP_UNINITIALIZED; + erp_action->fsf_req_id = 0; + erp_action->action = need; + erp_action->status = act_status; + + return erp_action; +} + +static void zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter, + struct zfcp_port *port, + struct scsi_device *sdev, + char *id, u32 act_status) +{ + int need; + struct zfcp_erp_action *act; + + need = zfcp_erp_handle_failed(want, adapter, port, sdev); + if (!need) { + need = ZFCP_ERP_ACTION_FAILED; /* marker for trace */ + goto out; + } + + if (!adapter->erp_thread) { + need = ZFCP_ERP_ACTION_NONE; /* marker for trace */ + goto out; + } + + need = zfcp_erp_required_act(want, adapter, port, sdev); + if (!need) + goto out; + + act = zfcp_erp_setup_act(need, act_status, adapter, port, sdev); + if (!act) { + need |= ZFCP_ERP_ACTION_NONE; /* marker for trace */ + goto out; + } + atomic_or(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status); + ++adapter->erp_total_count; + list_add_tail(&act->list, &adapter->erp_ready_head); + wake_up(&adapter->erp_ready_wq); + out: + zfcp_dbf_rec_trig(id, adapter, port, sdev, want, need); +} + +void zfcp_erp_port_forced_no_port_dbf(char *id, struct zfcp_adapter *adapter, + u64 port_name, u32 port_id) +{ + unsigned long flags; + static /* don't waste stack */ struct zfcp_port tmpport; + + write_lock_irqsave(&adapter->erp_lock, flags); + /* Stand-in zfcp port with fields just good enough for + * zfcp_dbf_rec_trig() and zfcp_dbf_set_common(). + * Under lock because tmpport is static. + */ + atomic_set(&tmpport.status, -1); /* unknown */ + tmpport.wwpn = port_name; + tmpport.d_id = port_id; + zfcp_dbf_rec_trig(id, adapter, &tmpport, NULL, + ZFCP_ERP_ACTION_REOPEN_PORT_FORCED, + ZFCP_ERP_ACTION_NONE); + write_unlock_irqrestore(&adapter->erp_lock, flags); +} + +static void _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, + int clear_mask, char *id) +{ + zfcp_erp_adapter_block(adapter, clear_mask); + zfcp_scsi_schedule_rports_block(adapter); + + zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, + adapter, NULL, NULL, id, 0); +} + +/** + * zfcp_erp_adapter_reopen - Reopen adapter. + * @adapter: Adapter to reopen. + * @clear: Status flags to clear. + * @id: Id for debug trace event. + */ +void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear, char *id) +{ + unsigned long flags; + + zfcp_erp_adapter_block(adapter, clear); + zfcp_scsi_schedule_rports_block(adapter); + + write_lock_irqsave(&adapter->erp_lock, flags); + zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter, + NULL, NULL, id, 0); + write_unlock_irqrestore(&adapter->erp_lock, flags); +} + +/** + * zfcp_erp_adapter_shutdown - Shutdown adapter. + * @adapter: Adapter to shut down. + * @clear: Status flags to clear. + * @id: Id for debug trace event. + */ +void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear, + char *id) +{ + int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED; + zfcp_erp_adapter_reopen(adapter, clear | flags, id); +} + +/** + * zfcp_erp_port_shutdown - Shutdown port + * @port: Port to shut down. + * @clear: Status flags to clear. + * @id: Id for debug trace event. + */ +void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id) +{ + int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED; + zfcp_erp_port_reopen(port, clear | flags, id); +} + +static void zfcp_erp_port_block(struct zfcp_port *port, int clear) +{ + zfcp_erp_clear_port_status(port, + ZFCP_STATUS_COMMON_UNBLOCKED | clear); +} + +static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, + char *id) +{ + zfcp_erp_port_block(port, clear); + zfcp_scsi_schedule_rport_block(port); + + zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED, + port->adapter, port, NULL, id, 0); +} + +/** + * zfcp_erp_port_forced_reopen - Forced close of port and open again + * @port: Port to force close and to reopen. + * @clear: Status flags to clear. + * @id: Id for debug trace event. + */ +void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id) +{ + unsigned long flags; + struct zfcp_adapter *adapter = port->adapter; + + write_lock_irqsave(&adapter->erp_lock, flags); + _zfcp_erp_port_forced_reopen(port, clear, id); + write_unlock_irqrestore(&adapter->erp_lock, flags); +} + +static void _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id) +{ + zfcp_erp_port_block(port, clear); + zfcp_scsi_schedule_rport_block(port); + + zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT, + port->adapter, port, NULL, id, 0); +} + +/** + * zfcp_erp_port_reopen - trigger remote port recovery + * @port: port to recover + * @clear_mask: flags in port status to be cleared + * @id: Id for debug trace event. + */ +void zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id) +{ + unsigned long flags; + struct zfcp_adapter *adapter = port->adapter; + + write_lock_irqsave(&adapter->erp_lock, flags); + _zfcp_erp_port_reopen(port, clear, id); + write_unlock_irqrestore(&adapter->erp_lock, flags); +} + +static void zfcp_erp_lun_block(struct scsi_device *sdev, int clear_mask) +{ + zfcp_erp_clear_lun_status(sdev, + ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask); +} + +static void _zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id, + u32 act_status) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; + + zfcp_erp_lun_block(sdev, clear); + + zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_LUN, adapter, + zfcp_sdev->port, sdev, id, act_status); +} + +/** + * zfcp_erp_lun_reopen - initiate reopen of a LUN + * @sdev: SCSI device / LUN to be reopened + * @clear_mask: specifies flags in LUN status to be cleared + * @id: Id for debug trace event. + * + * Return: 0 on success, < 0 on error + */ +void zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id) +{ + unsigned long flags; + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + struct zfcp_port *port = zfcp_sdev->port; + struct zfcp_adapter *adapter = port->adapter; + + write_lock_irqsave(&adapter->erp_lock, flags); + _zfcp_erp_lun_reopen(sdev, clear, id, 0); + write_unlock_irqrestore(&adapter->erp_lock, flags); +} + +/** + * zfcp_erp_lun_shutdown - Shutdown LUN + * @sdev: SCSI device / LUN to shut down. + * @clear: Status flags to clear. + * @id: Id for debug trace event. + */ +void zfcp_erp_lun_shutdown(struct scsi_device *sdev, int clear, char *id) +{ + int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED; + zfcp_erp_lun_reopen(sdev, clear | flags, id); +} + +/** + * zfcp_erp_lun_shutdown_wait - Shutdown LUN and wait for erp completion + * @sdev: SCSI device / LUN to shut down. + * @id: Id for debug trace event. + * + * Do not acquire a reference for the LUN when creating the ERP + * action. It is safe, because this function waits for the ERP to + * complete first. This allows to shutdown the LUN, even when the SCSI + * device is in the state SDEV_DEL when scsi_device_get will fail. + */ +void zfcp_erp_lun_shutdown_wait(struct scsi_device *sdev, char *id) +{ + unsigned long flags; + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + struct zfcp_port *port = zfcp_sdev->port; + struct zfcp_adapter *adapter = port->adapter; + int clear = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED; + + write_lock_irqsave(&adapter->erp_lock, flags); + _zfcp_erp_lun_reopen(sdev, clear, id, ZFCP_STATUS_ERP_NO_REF); + write_unlock_irqrestore(&adapter->erp_lock, flags); + + zfcp_erp_wait(adapter); +} + +static int zfcp_erp_status_change_set(unsigned long mask, atomic_t *status) +{ + return (atomic_read(status) ^ mask) & mask; +} + +static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter) +{ + if (zfcp_erp_status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, + &adapter->status)) + zfcp_dbf_rec_run("eraubl1", &adapter->erp_action); + atomic_or(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status); +} + +static void zfcp_erp_port_unblock(struct zfcp_port *port) +{ + if (zfcp_erp_status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, + &port->status)) + zfcp_dbf_rec_run("erpubl1", &port->erp_action); + atomic_or(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status); +} + +static void zfcp_erp_lun_unblock(struct scsi_device *sdev) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + + if (zfcp_erp_status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, + &zfcp_sdev->status)) + zfcp_dbf_rec_run("erlubl1", &sdev_to_zfcp(sdev)->erp_action); + atomic_or(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status); +} + +static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action) +{ + list_move(&erp_action->list, &erp_action->adapter->erp_running_head); + zfcp_dbf_rec_run("erator1", erp_action); +} + +static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act) +{ + struct zfcp_adapter *adapter = act->adapter; + struct zfcp_fsf_req *req; + + if (!act->fsf_req_id) + return; + + spin_lock(&adapter->req_list->lock); + req = _zfcp_reqlist_find(adapter->req_list, act->fsf_req_id); + if (req && req->erp_action == act) { + if (act->status & (ZFCP_STATUS_ERP_DISMISSED | + ZFCP_STATUS_ERP_TIMEDOUT)) { + req->status |= ZFCP_STATUS_FSFREQ_DISMISSED; + zfcp_dbf_rec_run("erscf_1", act); + /* lock-free concurrent access with + * zfcp_erp_timeout_handler() + */ + WRITE_ONCE(req->erp_action, NULL); + } + if (act->status & ZFCP_STATUS_ERP_TIMEDOUT) + zfcp_dbf_rec_run("erscf_2", act); + if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) + act->fsf_req_id = 0; + } else + act->fsf_req_id = 0; + spin_unlock(&adapter->req_list->lock); +} + +/** + * zfcp_erp_notify - Trigger ERP action. + * @erp_action: ERP action to continue. + * @set_mask: ERP action status flags to set. + */ +void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask) +{ + struct zfcp_adapter *adapter = erp_action->adapter; + unsigned long flags; + + write_lock_irqsave(&adapter->erp_lock, flags); + if (zfcp_erp_action_is_running(erp_action)) { + erp_action->status |= set_mask; + zfcp_erp_action_ready(erp_action); + } + write_unlock_irqrestore(&adapter->erp_lock, flags); +} + +/** + * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request + * @data: ERP action (from timer data) + */ +void zfcp_erp_timeout_handler(struct timer_list *t) +{ + struct zfcp_fsf_req *fsf_req = from_timer(fsf_req, t, timer); + struct zfcp_erp_action *act; + + if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) + return; + /* lock-free concurrent access with zfcp_erp_strategy_check_fsfreq() */ + act = READ_ONCE(fsf_req->erp_action); + if (!act) + return; + zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT); +} + +static void zfcp_erp_memwait_handler(struct timer_list *t) +{ + struct zfcp_erp_action *act = from_timer(act, t, timer); + + zfcp_erp_notify(act, 0); +} + +static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action) +{ + timer_setup(&erp_action->timer, zfcp_erp_memwait_handler, 0); + erp_action->timer.expires = jiffies + HZ; + add_timer(&erp_action->timer); +} + +void zfcp_erp_port_forced_reopen_all(struct zfcp_adapter *adapter, + int clear, char *dbftag) +{ + unsigned long flags; + struct zfcp_port *port; + + write_lock_irqsave(&adapter->erp_lock, flags); + read_lock(&adapter->port_list_lock); + list_for_each_entry(port, &adapter->port_list, list) + _zfcp_erp_port_forced_reopen(port, clear, dbftag); + read_unlock(&adapter->port_list_lock); + write_unlock_irqrestore(&adapter->erp_lock, flags); +} + +static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter, + int clear, char *id) +{ + struct zfcp_port *port; + + read_lock(&adapter->port_list_lock); + list_for_each_entry(port, &adapter->port_list, list) + _zfcp_erp_port_reopen(port, clear, id); + read_unlock(&adapter->port_list_lock); +} + +static void _zfcp_erp_lun_reopen_all(struct zfcp_port *port, int clear, + char *id) +{ + struct scsi_device *sdev; + + spin_lock(port->adapter->scsi_host->host_lock); + __shost_for_each_device(sdev, port->adapter->scsi_host) + if (sdev_to_zfcp(sdev)->port == port) + _zfcp_erp_lun_reopen(sdev, clear, id, 0); + spin_unlock(port->adapter->scsi_host->host_lock); +} + +static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act) +{ + switch (act->action) { + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1"); + break; + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2"); + break; + case ZFCP_ERP_ACTION_REOPEN_PORT: + _zfcp_erp_port_reopen(act->port, 0, "ersff_3"); + break; + case ZFCP_ERP_ACTION_REOPEN_LUN: + _zfcp_erp_lun_reopen(act->sdev, 0, "ersff_4", 0); + break; + } +} + +static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act) +{ + switch (act->action) { + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1"); + break; + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + _zfcp_erp_port_reopen(act->port, 0, "ersfs_2"); + break; + case ZFCP_ERP_ACTION_REOPEN_PORT: + _zfcp_erp_lun_reopen_all(act->port, 0, "ersfs_3"); + break; + } +} + +static void zfcp_erp_wakeup(struct zfcp_adapter *adapter) +{ + unsigned long flags; + + read_lock_irqsave(&adapter->erp_lock, flags); + if (list_empty(&adapter->erp_ready_head) && + list_empty(&adapter->erp_running_head)) { + atomic_andnot(ZFCP_STATUS_ADAPTER_ERP_PENDING, + &adapter->status); + wake_up(&adapter->erp_done_wqh); + } + read_unlock_irqrestore(&adapter->erp_lock, flags); +} + +static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter) +{ + struct zfcp_port *port; + port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0, + adapter->peer_d_id); + if (IS_ERR(port)) /* error or port already attached */ + return; + zfcp_erp_port_reopen(port, 0, "ereptp1"); +} + +static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action) +{ + int retries; + int sleep = 1; + struct zfcp_adapter *adapter = erp_action->adapter; + + atomic_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status); + + for (retries = 7; retries; retries--) { + atomic_andnot(ZFCP_STATUS_ADAPTER_HOST_CON_INIT, + &adapter->status); + write_lock_irq(&adapter->erp_lock); + zfcp_erp_action_to_running(erp_action); + write_unlock_irq(&adapter->erp_lock); + if (zfcp_fsf_exchange_config_data(erp_action)) { + atomic_andnot(ZFCP_STATUS_ADAPTER_HOST_CON_INIT, + &adapter->status); + return ZFCP_ERP_FAILED; + } + + wait_event(adapter->erp_ready_wq, + !list_empty(&adapter->erp_ready_head)); + if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) + break; + + if (!(atomic_read(&adapter->status) & + ZFCP_STATUS_ADAPTER_HOST_CON_INIT)) + break; + + ssleep(sleep); + sleep *= 2; + } + + atomic_andnot(ZFCP_STATUS_ADAPTER_HOST_CON_INIT, + &adapter->status); + + if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK)) + return ZFCP_ERP_FAILED; + + if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP) + zfcp_erp_enqueue_ptp_port(adapter); + + return ZFCP_ERP_SUCCEEDED; +} + +static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act) +{ + int ret; + struct zfcp_adapter *adapter = act->adapter; + + write_lock_irq(&adapter->erp_lock); + zfcp_erp_action_to_running(act); + write_unlock_irq(&adapter->erp_lock); + + ret = zfcp_fsf_exchange_port_data(act); + if (ret == -EOPNOTSUPP) + return ZFCP_ERP_SUCCEEDED; + if (ret) + return ZFCP_ERP_FAILED; + + zfcp_dbf_rec_run("erasox1", act); + wait_event(adapter->erp_ready_wq, + !list_empty(&adapter->erp_ready_head)); + zfcp_dbf_rec_run("erasox2", act); + if (act->status & ZFCP_STATUS_ERP_TIMEDOUT) + return ZFCP_ERP_FAILED; + + return ZFCP_ERP_SUCCEEDED; +} + +static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act) +{ + if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED) + return ZFCP_ERP_FAILED; + + if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED) + return ZFCP_ERP_FAILED; + + if (mempool_resize(act->adapter->pool.sr_data, + act->adapter->stat_read_buf_num)) + return ZFCP_ERP_FAILED; + + if (mempool_resize(act->adapter->pool.status_read_req, + act->adapter->stat_read_buf_num)) + return ZFCP_ERP_FAILED; + + atomic_set(&act->adapter->stat_miss, act->adapter->stat_read_buf_num); + if (zfcp_status_read_refill(act->adapter)) + return ZFCP_ERP_FAILED; + + return ZFCP_ERP_SUCCEEDED; +} + +static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act) +{ + struct zfcp_adapter *adapter = act->adapter; + + /* close queues to ensure that buffers are not accessed by adapter */ + zfcp_qdio_close(adapter->qdio); + zfcp_fsf_req_dismiss_all(adapter); + adapter->fsf_req_seq_no = 0; + zfcp_fc_wka_ports_force_offline(adapter->gs); + /* all ports and LUNs are closed */ + zfcp_erp_clear_adapter_status(adapter, ZFCP_STATUS_COMMON_OPEN); + + atomic_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK | + ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status); +} + +static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act) +{ + struct zfcp_adapter *adapter = act->adapter; + + if (zfcp_qdio_open(adapter->qdio)) { + atomic_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK | + ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, + &adapter->status); + return ZFCP_ERP_FAILED; + } + + if (zfcp_erp_adapter_strategy_open_fsf(act)) { + zfcp_erp_adapter_strategy_close(act); + return ZFCP_ERP_FAILED; + } + + atomic_or(ZFCP_STATUS_COMMON_OPEN, &adapter->status); + + return ZFCP_ERP_SUCCEEDED; +} + +static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act) +{ + struct zfcp_adapter *adapter = act->adapter; + + if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) { + zfcp_erp_adapter_strategy_close(act); + if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY) + return ZFCP_ERP_EXIT; + } + + if (zfcp_erp_adapter_strategy_open(act)) { + ssleep(8); + return ZFCP_ERP_FAILED; + } + + return ZFCP_ERP_SUCCEEDED; +} + +static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act) +{ + int retval; + + retval = zfcp_fsf_close_physical_port(act); + if (retval == -ENOMEM) + return ZFCP_ERP_NOMEM; + act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING; + if (retval) + return ZFCP_ERP_FAILED; + + return ZFCP_ERP_CONTINUES; +} + +static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action) +{ + struct zfcp_port *port = erp_action->port; + int status = atomic_read(&port->status); + + switch (erp_action->step) { + case ZFCP_ERP_STEP_UNINITIALIZED: + if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) && + (status & ZFCP_STATUS_COMMON_OPEN)) + return zfcp_erp_port_forced_strategy_close(erp_action); + else + return ZFCP_ERP_FAILED; + + case ZFCP_ERP_STEP_PHYS_PORT_CLOSING: + if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN)) + return ZFCP_ERP_SUCCEEDED; + } + return ZFCP_ERP_FAILED; +} + +static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action) +{ + int retval; + + retval = zfcp_fsf_close_port(erp_action); + if (retval == -ENOMEM) + return ZFCP_ERP_NOMEM; + erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING; + if (retval) + return ZFCP_ERP_FAILED; + return ZFCP_ERP_CONTINUES; +} + +static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action) +{ + int retval; + + retval = zfcp_fsf_open_port(erp_action); + if (retval == -ENOMEM) + return ZFCP_ERP_NOMEM; + erp_action->step = ZFCP_ERP_STEP_PORT_OPENING; + if (retval) + return ZFCP_ERP_FAILED; + return ZFCP_ERP_CONTINUES; +} + +static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act) +{ + struct zfcp_adapter *adapter = act->adapter; + struct zfcp_port *port = act->port; + + if (port->wwpn != adapter->peer_wwpn) { + zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); + return ZFCP_ERP_FAILED; + } + port->d_id = adapter->peer_d_id; + return zfcp_erp_port_strategy_open_port(act); +} + +static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act) +{ + struct zfcp_adapter *adapter = act->adapter; + struct zfcp_port *port = act->port; + int p_status = atomic_read(&port->status); + + switch (act->step) { + case ZFCP_ERP_STEP_UNINITIALIZED: + case ZFCP_ERP_STEP_PHYS_PORT_CLOSING: + case ZFCP_ERP_STEP_PORT_CLOSING: + if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP) + return zfcp_erp_open_ptp_port(act); + if (!port->d_id) { + zfcp_fc_trigger_did_lookup(port); + return ZFCP_ERP_EXIT; + } + return zfcp_erp_port_strategy_open_port(act); + + case ZFCP_ERP_STEP_PORT_OPENING: + /* D_ID might have changed during open */ + if (p_status & ZFCP_STATUS_COMMON_OPEN) { + if (!port->d_id) { + zfcp_fc_trigger_did_lookup(port); + return ZFCP_ERP_EXIT; + } + return ZFCP_ERP_SUCCEEDED; + } + if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) { + port->d_id = 0; + return ZFCP_ERP_FAILED; + } + /* fall through otherwise */ + } + return ZFCP_ERP_FAILED; +} + +static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action) +{ + struct zfcp_port *port = erp_action->port; + int p_status = atomic_read(&port->status); + + if ((p_status & ZFCP_STATUS_COMMON_NOESC) && + !(p_status & ZFCP_STATUS_COMMON_OPEN)) + goto close_init_done; + + switch (erp_action->step) { + case ZFCP_ERP_STEP_UNINITIALIZED: + if (p_status & ZFCP_STATUS_COMMON_OPEN) + return zfcp_erp_port_strategy_close(erp_action); + break; + + case ZFCP_ERP_STEP_PORT_CLOSING: + if (p_status & ZFCP_STATUS_COMMON_OPEN) + return ZFCP_ERP_FAILED; + break; + } + +close_init_done: + if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY) + return ZFCP_ERP_EXIT; + + return zfcp_erp_port_strategy_open_common(erp_action); +} + +static void zfcp_erp_lun_strategy_clearstati(struct scsi_device *sdev) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + + atomic_andnot(ZFCP_STATUS_COMMON_ACCESS_DENIED, + &zfcp_sdev->status); +} + +static int zfcp_erp_lun_strategy_close(struct zfcp_erp_action *erp_action) +{ + int retval = zfcp_fsf_close_lun(erp_action); + if (retval == -ENOMEM) + return ZFCP_ERP_NOMEM; + erp_action->step = ZFCP_ERP_STEP_LUN_CLOSING; + if (retval) + return ZFCP_ERP_FAILED; + return ZFCP_ERP_CONTINUES; +} + +static int zfcp_erp_lun_strategy_open(struct zfcp_erp_action *erp_action) +{ + int retval = zfcp_fsf_open_lun(erp_action); + if (retval == -ENOMEM) + return ZFCP_ERP_NOMEM; + erp_action->step = ZFCP_ERP_STEP_LUN_OPENING; + if (retval) + return ZFCP_ERP_FAILED; + return ZFCP_ERP_CONTINUES; +} + +static int zfcp_erp_lun_strategy(struct zfcp_erp_action *erp_action) +{ + struct scsi_device *sdev = erp_action->sdev; + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + + switch (erp_action->step) { + case ZFCP_ERP_STEP_UNINITIALIZED: + zfcp_erp_lun_strategy_clearstati(sdev); + if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN) + return zfcp_erp_lun_strategy_close(erp_action); + /* already closed, fall through */ + case ZFCP_ERP_STEP_LUN_CLOSING: + if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN) + return ZFCP_ERP_FAILED; + if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY) + return ZFCP_ERP_EXIT; + return zfcp_erp_lun_strategy_open(erp_action); + + case ZFCP_ERP_STEP_LUN_OPENING: + if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN) + return ZFCP_ERP_SUCCEEDED; + } + return ZFCP_ERP_FAILED; +} + +static int zfcp_erp_strategy_check_lun(struct scsi_device *sdev, int result) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + + switch (result) { + case ZFCP_ERP_SUCCEEDED : + atomic_set(&zfcp_sdev->erp_counter, 0); + zfcp_erp_lun_unblock(sdev); + break; + case ZFCP_ERP_FAILED : + atomic_inc(&zfcp_sdev->erp_counter); + if (atomic_read(&zfcp_sdev->erp_counter) > ZFCP_MAX_ERPS) { + dev_err(&zfcp_sdev->port->adapter->ccw_device->dev, + "ERP failed for LUN 0x%016Lx on " + "port 0x%016Lx\n", + (unsigned long long)zfcp_scsi_dev_lun(sdev), + (unsigned long long)zfcp_sdev->port->wwpn); + zfcp_erp_set_lun_status(sdev, + ZFCP_STATUS_COMMON_ERP_FAILED); + } + break; + } + + if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) { + zfcp_erp_lun_block(sdev, 0); + result = ZFCP_ERP_EXIT; + } + return result; +} + +static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result) +{ + switch (result) { + case ZFCP_ERP_SUCCEEDED : + atomic_set(&port->erp_counter, 0); + zfcp_erp_port_unblock(port); + break; + + case ZFCP_ERP_FAILED : + if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) { + zfcp_erp_port_block(port, 0); + result = ZFCP_ERP_EXIT; + } + atomic_inc(&port->erp_counter); + if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) { + dev_err(&port->adapter->ccw_device->dev, + "ERP failed for remote port 0x%016Lx\n", + (unsigned long long)port->wwpn); + zfcp_erp_set_port_status(port, + ZFCP_STATUS_COMMON_ERP_FAILED); + } + break; + } + + if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) { + zfcp_erp_port_block(port, 0); + result = ZFCP_ERP_EXIT; + } + return result; +} + +static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter, + int result) +{ + switch (result) { + case ZFCP_ERP_SUCCEEDED : + atomic_set(&adapter->erp_counter, 0); + zfcp_erp_adapter_unblock(adapter); + break; + + case ZFCP_ERP_FAILED : + atomic_inc(&adapter->erp_counter); + if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) { + dev_err(&adapter->ccw_device->dev, + "ERP cannot recover an error " + "on the FCP device\n"); + zfcp_erp_set_adapter_status(adapter, + ZFCP_STATUS_COMMON_ERP_FAILED); + } + break; + } + + if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) { + zfcp_erp_adapter_block(adapter, 0); + result = ZFCP_ERP_EXIT; + } + return result; +} + +static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action, + int result) +{ + struct zfcp_adapter *adapter = erp_action->adapter; + struct zfcp_port *port = erp_action->port; + struct scsi_device *sdev = erp_action->sdev; + + switch (erp_action->action) { + + case ZFCP_ERP_ACTION_REOPEN_LUN: + result = zfcp_erp_strategy_check_lun(sdev, result); + break; + + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + case ZFCP_ERP_ACTION_REOPEN_PORT: + result = zfcp_erp_strategy_check_port(port, result); + break; + + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + result = zfcp_erp_strategy_check_adapter(adapter, result); + break; + } + return result; +} + +static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status) +{ + int status = atomic_read(target_status); + + if ((status & ZFCP_STATUS_COMMON_RUNNING) && + (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY)) + return 1; /* take it online */ + + if (!(status & ZFCP_STATUS_COMMON_RUNNING) && + !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY)) + return 1; /* take it offline */ + + return 0; +} + +static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret) +{ + int action = act->action; + struct zfcp_adapter *adapter = act->adapter; + struct zfcp_port *port = act->port; + struct scsi_device *sdev = act->sdev; + struct zfcp_scsi_dev *zfcp_sdev; + u32 erp_status = act->status; + + switch (action) { + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) { + _zfcp_erp_adapter_reopen(adapter, + ZFCP_STATUS_COMMON_ERP_FAILED, + "ersscg1"); + return ZFCP_ERP_EXIT; + } + break; + + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + case ZFCP_ERP_ACTION_REOPEN_PORT: + if (zfcp_erp_strat_change_det(&port->status, erp_status)) { + _zfcp_erp_port_reopen(port, + ZFCP_STATUS_COMMON_ERP_FAILED, + "ersscg2"); + return ZFCP_ERP_EXIT; + } + break; + + case ZFCP_ERP_ACTION_REOPEN_LUN: + zfcp_sdev = sdev_to_zfcp(sdev); + if (zfcp_erp_strat_change_det(&zfcp_sdev->status, erp_status)) { + _zfcp_erp_lun_reopen(sdev, + ZFCP_STATUS_COMMON_ERP_FAILED, + "ersscg3", 0); + return ZFCP_ERP_EXIT; + } + break; + } + return ret; +} + +static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action) +{ + struct zfcp_adapter *adapter = erp_action->adapter; + struct zfcp_scsi_dev *zfcp_sdev; + + adapter->erp_total_count--; + if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) { + adapter->erp_low_mem_count--; + erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM; + } + + list_del(&erp_action->list); + zfcp_dbf_rec_run("eractd1", erp_action); + + switch (erp_action->action) { + case ZFCP_ERP_ACTION_REOPEN_LUN: + zfcp_sdev = sdev_to_zfcp(erp_action->sdev); + atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE, + &zfcp_sdev->status); + break; + + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + case ZFCP_ERP_ACTION_REOPEN_PORT: + atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE, + &erp_action->port->status); + break; + + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE, + &erp_action->adapter->status); + break; + } +} + +/** + * zfcp_erp_try_rport_unblock - unblock rport if no more/new recovery + * @port: zfcp_port whose fc_rport we should try to unblock + */ +static void zfcp_erp_try_rport_unblock(struct zfcp_port *port) +{ + unsigned long flags; + struct zfcp_adapter *adapter = port->adapter; + int port_status; + struct Scsi_Host *shost = adapter->scsi_host; + struct scsi_device *sdev; + + write_lock_irqsave(&adapter->erp_lock, flags); + port_status = atomic_read(&port->status); + if ((port_status & ZFCP_STATUS_COMMON_UNBLOCKED) == 0 || + (port_status & (ZFCP_STATUS_COMMON_ERP_INUSE | + ZFCP_STATUS_COMMON_ERP_FAILED)) != 0) { + /* new ERP of severity >= port triggered elsewhere meanwhile or + * local link down (adapter erp_failed but not clear unblock) + */ + zfcp_dbf_rec_run_lvl(4, "ertru_p", &port->erp_action); + write_unlock_irqrestore(&adapter->erp_lock, flags); + return; + } + spin_lock(shost->host_lock); + __shost_for_each_device(sdev, shost) { + struct zfcp_scsi_dev *zsdev = sdev_to_zfcp(sdev); + int lun_status; + + if (sdev->sdev_state == SDEV_DEL || + sdev->sdev_state == SDEV_CANCEL) + continue; + if (zsdev->port != port) + continue; + /* LUN under port of interest */ + lun_status = atomic_read(&zsdev->status); + if ((lun_status & ZFCP_STATUS_COMMON_ERP_FAILED) != 0) + continue; /* unblock rport despite failed LUNs */ + /* LUN recovery not given up yet [maybe follow-up pending] */ + if ((lun_status & ZFCP_STATUS_COMMON_UNBLOCKED) == 0 || + (lun_status & ZFCP_STATUS_COMMON_ERP_INUSE) != 0) { + /* LUN blocked: + * not yet unblocked [LUN recovery pending] + * or meanwhile blocked [new LUN recovery triggered] + */ + zfcp_dbf_rec_run_lvl(4, "ertru_l", &zsdev->erp_action); + spin_unlock(shost->host_lock); + write_unlock_irqrestore(&adapter->erp_lock, flags); + return; + } + } + /* now port has no child or all children have completed recovery, + * and no ERP of severity >= port was meanwhile triggered elsewhere + */ + zfcp_scsi_schedule_rport_register(port); + spin_unlock(shost->host_lock); + write_unlock_irqrestore(&adapter->erp_lock, flags); +} + +static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result) +{ + struct zfcp_adapter *adapter = act->adapter; + struct zfcp_port *port = act->port; + struct scsi_device *sdev = act->sdev; + + switch (act->action) { + case ZFCP_ERP_ACTION_REOPEN_LUN: + if (!(act->status & ZFCP_STATUS_ERP_NO_REF)) + scsi_device_put(sdev); + zfcp_erp_try_rport_unblock(port); + break; + + case ZFCP_ERP_ACTION_REOPEN_PORT: + /* This switch case might also happen after a forced reopen + * was successfully done and thus overwritten with a new + * non-forced reopen at `ersfs_2'. In this case, we must not + * do the clean-up of the non-forced version. + */ + if (act->step != ZFCP_ERP_STEP_UNINITIALIZED) + if (result == ZFCP_ERP_SUCCEEDED) + zfcp_erp_try_rport_unblock(port); + /* fall through */ + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + put_device(&port->dev); + break; + + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + if (result == ZFCP_ERP_SUCCEEDED) { + register_service_level(&adapter->service_level); + zfcp_fc_conditional_port_scan(adapter); + queue_work(adapter->work_queue, &adapter->ns_up_work); + } else + unregister_service_level(&adapter->service_level); + + kref_put(&adapter->ref, zfcp_adapter_release); + break; + } +} + +static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action) +{ + switch (erp_action->action) { + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + return zfcp_erp_adapter_strategy(erp_action); + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + return zfcp_erp_port_forced_strategy(erp_action); + case ZFCP_ERP_ACTION_REOPEN_PORT: + return zfcp_erp_port_strategy(erp_action); + case ZFCP_ERP_ACTION_REOPEN_LUN: + return zfcp_erp_lun_strategy(erp_action); + } + return ZFCP_ERP_FAILED; +} + +static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action) +{ + int retval; + unsigned long flags; + struct zfcp_adapter *adapter = erp_action->adapter; + + kref_get(&adapter->ref); + + write_lock_irqsave(&adapter->erp_lock, flags); + zfcp_erp_strategy_check_fsfreq(erp_action); + + if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) { + zfcp_erp_action_dequeue(erp_action); + retval = ZFCP_ERP_DISMISSED; + goto unlock; + } + + if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) { + retval = ZFCP_ERP_FAILED; + goto check_target; + } + + zfcp_erp_action_to_running(erp_action); + + /* no lock to allow for blocking operations */ + write_unlock_irqrestore(&adapter->erp_lock, flags); + retval = zfcp_erp_strategy_do_action(erp_action); + write_lock_irqsave(&adapter->erp_lock, flags); + + if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) + retval = ZFCP_ERP_CONTINUES; + + switch (retval) { + case ZFCP_ERP_NOMEM: + if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) { + ++adapter->erp_low_mem_count; + erp_action->status |= ZFCP_STATUS_ERP_LOWMEM; + } + if (adapter->erp_total_count == adapter->erp_low_mem_count) + _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1"); + else { + zfcp_erp_strategy_memwait(erp_action); + retval = ZFCP_ERP_CONTINUES; + } + goto unlock; + + case ZFCP_ERP_CONTINUES: + if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) { + --adapter->erp_low_mem_count; + erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM; + } + goto unlock; + } + +check_target: + retval = zfcp_erp_strategy_check_target(erp_action, retval); + zfcp_erp_action_dequeue(erp_action); + retval = zfcp_erp_strategy_statechange(erp_action, retval); + if (retval == ZFCP_ERP_EXIT) + goto unlock; + if (retval == ZFCP_ERP_SUCCEEDED) + zfcp_erp_strategy_followup_success(erp_action); + if (retval == ZFCP_ERP_FAILED) + zfcp_erp_strategy_followup_failed(erp_action); + + unlock: + write_unlock_irqrestore(&adapter->erp_lock, flags); + + if (retval != ZFCP_ERP_CONTINUES) + zfcp_erp_action_cleanup(erp_action, retval); + + kref_put(&adapter->ref, zfcp_adapter_release); + return retval; +} + +static int zfcp_erp_thread(void *data) +{ + struct zfcp_adapter *adapter = (struct zfcp_adapter *) data; + struct list_head *next; + struct zfcp_erp_action *act; + unsigned long flags; + + for (;;) { + wait_event_interruptible(adapter->erp_ready_wq, + !list_empty(&adapter->erp_ready_head) || + kthread_should_stop()); + + if (kthread_should_stop()) + break; + + write_lock_irqsave(&adapter->erp_lock, flags); + next = adapter->erp_ready_head.next; + write_unlock_irqrestore(&adapter->erp_lock, flags); + + if (next != &adapter->erp_ready_head) { + act = list_entry(next, struct zfcp_erp_action, list); + + /* there is more to come after dismission, no notify */ + if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED) + zfcp_erp_wakeup(adapter); + } + } + + return 0; +} + +/** + * zfcp_erp_thread_setup - Start ERP thread for adapter + * @adapter: Adapter to start the ERP thread for + * + * Returns 0 on success or error code from kernel_thread() + */ +int zfcp_erp_thread_setup(struct zfcp_adapter *adapter) +{ + struct task_struct *thread; + + thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s", + dev_name(&adapter->ccw_device->dev)); + if (IS_ERR(thread)) { + dev_err(&adapter->ccw_device->dev, + "Creating an ERP thread for the FCP device failed.\n"); + return PTR_ERR(thread); + } + + adapter->erp_thread = thread; + return 0; +} + +/** + * zfcp_erp_thread_kill - Stop ERP thread. + * @adapter: Adapter where the ERP thread should be stopped. + * + * The caller of this routine ensures that the specified adapter has + * been shut down and that this operation has been completed. Thus, + * there are no pending erp_actions which would need to be handled + * here. + */ +void zfcp_erp_thread_kill(struct zfcp_adapter *adapter) +{ + kthread_stop(adapter->erp_thread); + adapter->erp_thread = NULL; + WARN_ON(!list_empty(&adapter->erp_ready_head)); + WARN_ON(!list_empty(&adapter->erp_running_head)); +} + +/** + * zfcp_erp_wait - wait for completion of error recovery on an adapter + * @adapter: adapter for which to wait for completion of its error recovery + */ +void zfcp_erp_wait(struct zfcp_adapter *adapter) +{ + wait_event(adapter->erp_done_wqh, + !(atomic_read(&adapter->status) & + ZFCP_STATUS_ADAPTER_ERP_PENDING)); +} + +/** + * zfcp_erp_set_adapter_status - set adapter status bits + * @adapter: adapter to change the status + * @mask: status bits to change + * + * Changes in common status bits are propagated to attached ports and LUNs. + */ +void zfcp_erp_set_adapter_status(struct zfcp_adapter *adapter, u32 mask) +{ + struct zfcp_port *port; + struct scsi_device *sdev; + unsigned long flags; + u32 common_mask = mask & ZFCP_COMMON_FLAGS; + + atomic_or(mask, &adapter->status); + + if (!common_mask) + return; + + read_lock_irqsave(&adapter->port_list_lock, flags); + list_for_each_entry(port, &adapter->port_list, list) + atomic_or(common_mask, &port->status); + read_unlock_irqrestore(&adapter->port_list_lock, flags); + + spin_lock_irqsave(adapter->scsi_host->host_lock, flags); + __shost_for_each_device(sdev, adapter->scsi_host) + atomic_or(common_mask, &sdev_to_zfcp(sdev)->status); + spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags); +} + +/** + * zfcp_erp_clear_adapter_status - clear adapter status bits + * @adapter: adapter to change the status + * @mask: status bits to change + * + * Changes in common status bits are propagated to attached ports and LUNs. + */ +void zfcp_erp_clear_adapter_status(struct zfcp_adapter *adapter, u32 mask) +{ + struct zfcp_port *port; + struct scsi_device *sdev; + unsigned long flags; + u32 common_mask = mask & ZFCP_COMMON_FLAGS; + u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED; + + atomic_andnot(mask, &adapter->status); + + if (!common_mask) + return; + + if (clear_counter) + atomic_set(&adapter->erp_counter, 0); + + read_lock_irqsave(&adapter->port_list_lock, flags); + list_for_each_entry(port, &adapter->port_list, list) { + atomic_andnot(common_mask, &port->status); + if (clear_counter) + atomic_set(&port->erp_counter, 0); + } + read_unlock_irqrestore(&adapter->port_list_lock, flags); + + spin_lock_irqsave(adapter->scsi_host->host_lock, flags); + __shost_for_each_device(sdev, adapter->scsi_host) { + atomic_andnot(common_mask, &sdev_to_zfcp(sdev)->status); + if (clear_counter) + atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0); + } + spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags); +} + +/** + * zfcp_erp_set_port_status - set port status bits + * @port: port to change the status + * @mask: status bits to change + * + * Changes in common status bits are propagated to attached LUNs. + */ +void zfcp_erp_set_port_status(struct zfcp_port *port, u32 mask) +{ + struct scsi_device *sdev; + u32 common_mask = mask & ZFCP_COMMON_FLAGS; + unsigned long flags; + + atomic_or(mask, &port->status); + + if (!common_mask) + return; + + spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags); + __shost_for_each_device(sdev, port->adapter->scsi_host) + if (sdev_to_zfcp(sdev)->port == port) + atomic_or(common_mask, + &sdev_to_zfcp(sdev)->status); + spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags); +} + +/** + * zfcp_erp_clear_port_status - clear port status bits + * @port: adapter to change the status + * @mask: status bits to change + * + * Changes in common status bits are propagated to attached LUNs. + */ +void zfcp_erp_clear_port_status(struct zfcp_port *port, u32 mask) +{ + struct scsi_device *sdev; + u32 common_mask = mask & ZFCP_COMMON_FLAGS; + u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED; + unsigned long flags; + + atomic_andnot(mask, &port->status); + + if (!common_mask) + return; + + if (clear_counter) + atomic_set(&port->erp_counter, 0); + + spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags); + __shost_for_each_device(sdev, port->adapter->scsi_host) + if (sdev_to_zfcp(sdev)->port == port) { + atomic_andnot(common_mask, + &sdev_to_zfcp(sdev)->status); + if (clear_counter) + atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0); + } + spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags); +} + +/** + * zfcp_erp_set_lun_status - set lun status bits + * @sdev: SCSI device / lun to set the status bits + * @mask: status bits to change + */ +void zfcp_erp_set_lun_status(struct scsi_device *sdev, u32 mask) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + + atomic_or(mask, &zfcp_sdev->status); +} + +/** + * zfcp_erp_clear_lun_status - clear lun status bits + * @sdev: SCSi device / lun to clear the status bits + * @mask: status bits to change + */ +void zfcp_erp_clear_lun_status(struct scsi_device *sdev, u32 mask) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + + atomic_andnot(mask, &zfcp_sdev->status); + + if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) + atomic_set(&zfcp_sdev->erp_counter, 0); +} + +/** + * zfcp_erp_adapter_reset_sync() - Really reopen adapter and wait. + * @adapter: Pointer to zfcp_adapter to reopen. + * @id: Trace tag string of length %ZFCP_DBF_TAG_LEN. + */ +void zfcp_erp_adapter_reset_sync(struct zfcp_adapter *adapter, char *id) +{ + zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING); + zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, id); + zfcp_erp_wait(adapter); +} diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h new file mode 100644 index 000000000..3d971ffbd --- /dev/null +++ b/drivers/s390/scsi/zfcp_ext.h @@ -0,0 +1,178 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * zfcp device driver + * + * External function declarations. + * + * Copyright IBM Corp. 2002, 2018 + */ + +#ifndef ZFCP_EXT_H +#define ZFCP_EXT_H + +#include +#include +#include "zfcp_def.h" +#include "zfcp_fc.h" + +/* zfcp_aux.c */ +extern struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *, u64); +extern struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *); +extern struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *, u64, u32, + u32); +extern void zfcp_sg_free_table(struct scatterlist *, int); +extern int zfcp_sg_setup_table(struct scatterlist *, int); +extern void zfcp_adapter_release(struct kref *); +extern void zfcp_adapter_unregister(struct zfcp_adapter *); + +/* zfcp_ccw.c */ +extern struct ccw_driver zfcp_ccw_driver; +extern struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *); +extern void zfcp_ccw_adapter_put(struct zfcp_adapter *); + +/* zfcp_dbf.c */ +extern int zfcp_dbf_adapter_register(struct zfcp_adapter *); +extern void zfcp_dbf_adapter_unregister(struct zfcp_adapter *); +extern void zfcp_dbf_rec_trig(char *, struct zfcp_adapter *, + struct zfcp_port *, struct scsi_device *, u8, u8); +extern void zfcp_dbf_rec_trig_lock(char *tag, struct zfcp_adapter *adapter, + struct zfcp_port *port, + struct scsi_device *sdev, u8 want, u8 need); +extern void zfcp_dbf_rec_run(char *, struct zfcp_erp_action *); +extern void zfcp_dbf_rec_run_lvl(int level, char *tag, + struct zfcp_erp_action *erp); +extern void zfcp_dbf_rec_run_wka(char *, struct zfcp_fc_wka_port *, u64); +extern void zfcp_dbf_hba_fsf_uss(char *, struct zfcp_fsf_req *); +extern void zfcp_dbf_hba_fsf_res(char *, int, struct zfcp_fsf_req *); +extern void zfcp_dbf_hba_bit_err(char *, struct zfcp_fsf_req *); +extern void zfcp_dbf_hba_def_err(struct zfcp_adapter *, u64, u16, void **); +extern void zfcp_dbf_hba_basic(char *, struct zfcp_adapter *); +extern void zfcp_dbf_san_req(char *, struct zfcp_fsf_req *, u32); +extern void zfcp_dbf_san_res(char *, struct zfcp_fsf_req *); +extern void zfcp_dbf_san_in_els(char *, struct zfcp_fsf_req *); +extern void zfcp_dbf_scsi_common(char *tag, int level, struct scsi_device *sdev, + struct scsi_cmnd *sc, + struct zfcp_fsf_req *fsf); +extern void zfcp_dbf_scsi_eh(char *tag, struct zfcp_adapter *adapter, + unsigned int scsi_id, int ret); + +/* zfcp_erp.c */ +extern void zfcp_erp_set_adapter_status(struct zfcp_adapter *, u32); +extern void zfcp_erp_clear_adapter_status(struct zfcp_adapter *, u32); +extern void zfcp_erp_port_forced_no_port_dbf(char *id, + struct zfcp_adapter *adapter, + u64 port_name, u32 port_id); +extern void zfcp_erp_adapter_reopen(struct zfcp_adapter *, int, char *); +extern void zfcp_erp_adapter_shutdown(struct zfcp_adapter *, int, char *); +extern void zfcp_erp_set_port_status(struct zfcp_port *, u32); +extern void zfcp_erp_clear_port_status(struct zfcp_port *, u32); +extern void zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id); +extern void zfcp_erp_port_shutdown(struct zfcp_port *, int, char *); +extern void zfcp_erp_port_forced_reopen(struct zfcp_port *, int, char *); +extern void zfcp_erp_port_forced_reopen_all(struct zfcp_adapter *adapter, + int clear, char *dbftag); +extern void zfcp_erp_set_lun_status(struct scsi_device *, u32); +extern void zfcp_erp_clear_lun_status(struct scsi_device *, u32); +extern void zfcp_erp_lun_reopen(struct scsi_device *, int, char *); +extern void zfcp_erp_lun_shutdown(struct scsi_device *, int, char *); +extern void zfcp_erp_lun_shutdown_wait(struct scsi_device *, char *); +extern int zfcp_erp_thread_setup(struct zfcp_adapter *); +extern void zfcp_erp_thread_kill(struct zfcp_adapter *); +extern void zfcp_erp_wait(struct zfcp_adapter *); +extern void zfcp_erp_notify(struct zfcp_erp_action *, unsigned long); +extern void zfcp_erp_timeout_handler(struct timer_list *t); +extern void zfcp_erp_adapter_reset_sync(struct zfcp_adapter *adapter, char *id); + +/* zfcp_fc.c */ +extern struct kmem_cache *zfcp_fc_req_cache; +extern void zfcp_fc_enqueue_event(struct zfcp_adapter *, + enum fc_host_event_code event_code, u32); +extern void zfcp_fc_post_event(struct work_struct *); +extern void zfcp_fc_scan_ports(struct work_struct *); +extern void zfcp_fc_incoming_els(struct zfcp_fsf_req *); +extern void zfcp_fc_port_did_lookup(struct work_struct *); +extern void zfcp_fc_trigger_did_lookup(struct zfcp_port *); +extern void zfcp_fc_plogi_evaluate(struct zfcp_port *, struct fc_els_flogi *); +extern void zfcp_fc_test_link(struct zfcp_port *); +extern void zfcp_fc_link_test_work(struct work_struct *); +extern void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *); +extern int zfcp_fc_gs_setup(struct zfcp_adapter *); +extern void zfcp_fc_gs_destroy(struct zfcp_adapter *); +extern int zfcp_fc_exec_bsg_job(struct bsg_job *); +extern int zfcp_fc_timeout_bsg_job(struct bsg_job *); +extern void zfcp_fc_sym_name_update(struct work_struct *); +extern unsigned int zfcp_fc_port_scan_backoff(void); +extern void zfcp_fc_conditional_port_scan(struct zfcp_adapter *); +extern void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *); + +/* zfcp_fsf.c */ +extern struct kmem_cache *zfcp_fsf_qtcb_cache; +extern int zfcp_fsf_open_port(struct zfcp_erp_action *); +extern int zfcp_fsf_open_wka_port(struct zfcp_fc_wka_port *); +extern int zfcp_fsf_close_wka_port(struct zfcp_fc_wka_port *); +extern int zfcp_fsf_close_port(struct zfcp_erp_action *); +extern int zfcp_fsf_close_physical_port(struct zfcp_erp_action *); +extern int zfcp_fsf_open_lun(struct zfcp_erp_action *); +extern int zfcp_fsf_close_lun(struct zfcp_erp_action *); +extern int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *); +extern int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *, + struct fsf_qtcb_bottom_config *); +extern int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *); +extern int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *, + struct fsf_qtcb_bottom_port *); +extern void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *); +extern int zfcp_fsf_status_read(struct zfcp_qdio *); +extern int zfcp_status_read_refill(struct zfcp_adapter *adapter); +extern int zfcp_fsf_send_ct(struct zfcp_fc_wka_port *, struct zfcp_fsf_ct_els *, + mempool_t *, unsigned int); +extern int zfcp_fsf_send_els(struct zfcp_adapter *, u32, + struct zfcp_fsf_ct_els *, unsigned int); +extern int zfcp_fsf_fcp_cmnd(struct scsi_cmnd *); +extern void zfcp_fsf_req_free(struct zfcp_fsf_req *); +extern struct zfcp_fsf_req *zfcp_fsf_fcp_task_mgmt(struct scsi_device *sdev, + u8 tm_flags); +extern struct zfcp_fsf_req *zfcp_fsf_abort_fcp_cmnd(struct scsi_cmnd *); +extern void zfcp_fsf_reqid_check(struct zfcp_qdio *, int); + +/* zfcp_qdio.c */ +extern int zfcp_qdio_setup(struct zfcp_adapter *); +extern void zfcp_qdio_destroy(struct zfcp_qdio *); +extern int zfcp_qdio_sbal_get(struct zfcp_qdio *); +extern int zfcp_qdio_send(struct zfcp_qdio *, struct zfcp_qdio_req *); +extern int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *, struct zfcp_qdio_req *, + struct scatterlist *); +extern int zfcp_qdio_open(struct zfcp_qdio *); +extern void zfcp_qdio_close(struct zfcp_qdio *); +extern void zfcp_qdio_siosl(struct zfcp_adapter *); + +/* zfcp_scsi.c */ +extern struct scsi_transport_template *zfcp_scsi_transport_template; +extern int zfcp_scsi_adapter_register(struct zfcp_adapter *); +extern void zfcp_scsi_adapter_unregister(struct zfcp_adapter *); +extern struct fc_function_template zfcp_transport_functions; +extern void zfcp_scsi_rport_work(struct work_struct *); +extern void zfcp_scsi_schedule_rport_register(struct zfcp_port *); +extern void zfcp_scsi_schedule_rport_block(struct zfcp_port *); +extern void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *); +extern void zfcp_scsi_set_prot(struct zfcp_adapter *); +extern void zfcp_scsi_dif_sense_error(struct scsi_cmnd *, int); + +/* zfcp_sysfs.c */ +extern const struct attribute_group *zfcp_unit_attr_groups[]; +extern struct attribute_group zfcp_sysfs_adapter_attrs; +extern const struct attribute_group *zfcp_port_attr_groups[]; +extern struct mutex zfcp_sysfs_port_units_mutex; +extern struct device_attribute *zfcp_sysfs_sdev_attrs[]; +extern struct device_attribute *zfcp_sysfs_shost_attrs[]; +bool zfcp_sysfs_port_is_removing(const struct zfcp_port *const port); + +/* zfcp_unit.c */ +extern int zfcp_unit_add(struct zfcp_port *, u64); +extern int zfcp_unit_remove(struct zfcp_port *, u64); +extern struct zfcp_unit *zfcp_unit_find(struct zfcp_port *, u64); +extern struct scsi_device *zfcp_unit_sdev(struct zfcp_unit *unit); +extern void zfcp_unit_scsi_scan(struct zfcp_unit *); +extern void zfcp_unit_queue_scsi_scan(struct zfcp_port *); +extern unsigned int zfcp_unit_sdev_status(struct zfcp_unit *); + +#endif /* ZFCP_EXT_H */ diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c new file mode 100644 index 000000000..09ce175bb --- /dev/null +++ b/drivers/s390/scsi/zfcp_fc.c @@ -0,0 +1,1073 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * Fibre Channel related functions for the zfcp device driver. + * + * Copyright IBM Corp. 2008, 2017 + */ + +#define KMSG_COMPONENT "zfcp" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include "zfcp_ext.h" +#include "zfcp_fc.h" + +struct kmem_cache *zfcp_fc_req_cache; + +static u32 zfcp_fc_rscn_range_mask[] = { + [ELS_ADDR_FMT_PORT] = 0xFFFFFF, + [ELS_ADDR_FMT_AREA] = 0xFFFF00, + [ELS_ADDR_FMT_DOM] = 0xFF0000, + [ELS_ADDR_FMT_FAB] = 0x000000, +}; + +static bool no_auto_port_rescan; +module_param(no_auto_port_rescan, bool, 0600); +MODULE_PARM_DESC(no_auto_port_rescan, + "no automatic port_rescan (default off)"); + +static unsigned int port_scan_backoff = 500; +module_param(port_scan_backoff, uint, 0600); +MODULE_PARM_DESC(port_scan_backoff, + "upper limit of port scan random backoff in msecs (default 500)"); + +static unsigned int port_scan_ratelimit = 60000; +module_param(port_scan_ratelimit, uint, 0600); +MODULE_PARM_DESC(port_scan_ratelimit, + "minimum interval between port scans in msecs (default 60000)"); + +unsigned int zfcp_fc_port_scan_backoff(void) +{ + if (!port_scan_backoff) + return 0; + return get_random_int() % port_scan_backoff; +} + +static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter) +{ + unsigned long interval = msecs_to_jiffies(port_scan_ratelimit); + unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff()); + + adapter->next_port_scan = jiffies + interval + backoff; +} + +static void zfcp_fc_port_scan(struct zfcp_adapter *adapter) +{ + unsigned long now = jiffies; + unsigned long next = adapter->next_port_scan; + unsigned long delay = 0, max; + + /* delay only needed within waiting period */ + if (time_before(now, next)) { + delay = next - now; + /* paranoia: never ever delay scans longer than specified */ + max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff); + delay = min(delay, max); + } + + queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay); +} + +void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter) +{ + if (no_auto_port_rescan) + return; + + zfcp_fc_port_scan(adapter); +} + +void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter) +{ + if (!no_auto_port_rescan) + return; + + zfcp_fc_port_scan(adapter); +} + +/** + * zfcp_fc_post_event - post event to userspace via fc_transport + * @work: work struct with enqueued events + */ +void zfcp_fc_post_event(struct work_struct *work) +{ + struct zfcp_fc_event *event = NULL, *tmp = NULL; + LIST_HEAD(tmp_lh); + struct zfcp_fc_events *events = container_of(work, + struct zfcp_fc_events, work); + struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter, + events); + + spin_lock_bh(&events->list_lock); + list_splice_init(&events->list, &tmp_lh); + spin_unlock_bh(&events->list_lock); + + list_for_each_entry_safe(event, tmp, &tmp_lh, list) { + fc_host_post_event(adapter->scsi_host, fc_get_event_number(), + event->code, event->data); + list_del(&event->list); + kfree(event); + } +} + +/** + * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context + * @adapter: The adapter where to enqueue the event + * @event_code: The event code (as defined in fc_host_event_code in + * scsi_transport_fc.h) + * @event_data: The event data (e.g. n_port page in case of els) + */ +void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter, + enum fc_host_event_code event_code, u32 event_data) +{ + struct zfcp_fc_event *event; + + event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC); + if (!event) + return; + + event->code = event_code; + event->data = event_data; + + spin_lock(&adapter->events.list_lock); + list_add_tail(&event->list, &adapter->events.list); + spin_unlock(&adapter->events.list_lock); + + queue_work(adapter->work_queue, &adapter->events.work); +} + +static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port) +{ + if (mutex_lock_interruptible(&wka_port->mutex)) + return -ERESTARTSYS; + + if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE || + wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) { + wka_port->status = ZFCP_FC_WKA_PORT_OPENING; + if (zfcp_fsf_open_wka_port(wka_port)) + wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; + } + + mutex_unlock(&wka_port->mutex); + + wait_event(wka_port->completion_wq, + wka_port->status == ZFCP_FC_WKA_PORT_ONLINE || + wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE); + + if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) { + atomic_inc(&wka_port->refcount); + return 0; + } + return -EIO; +} + +static void zfcp_fc_wka_port_offline(struct work_struct *work) +{ + struct delayed_work *dw = to_delayed_work(work); + struct zfcp_fc_wka_port *wka_port = + container_of(dw, struct zfcp_fc_wka_port, work); + + mutex_lock(&wka_port->mutex); + if ((atomic_read(&wka_port->refcount) != 0) || + (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE)) + goto out; + + wka_port->status = ZFCP_FC_WKA_PORT_CLOSING; + if (zfcp_fsf_close_wka_port(wka_port)) { + wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; + wake_up(&wka_port->completion_wq); + } +out: + mutex_unlock(&wka_port->mutex); +} + +static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port) +{ + if (atomic_dec_return(&wka_port->refcount) != 0) + return; + /* wait 10 milliseconds, other reqs might pop in */ + schedule_delayed_work(&wka_port->work, HZ / 100); +} + +static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id, + struct zfcp_adapter *adapter) +{ + init_waitqueue_head(&wka_port->completion_wq); + + wka_port->adapter = adapter; + wka_port->d_id = d_id; + + wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; + atomic_set(&wka_port->refcount, 0); + mutex_init(&wka_port->mutex); + INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline); +} + +static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka) +{ + cancel_delayed_work_sync(&wka->work); + mutex_lock(&wka->mutex); + wka->status = ZFCP_FC_WKA_PORT_OFFLINE; + mutex_unlock(&wka->mutex); +} + +void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs) +{ + if (!gs) + return; + zfcp_fc_wka_port_force_offline(&gs->ms); + zfcp_fc_wka_port_force_offline(&gs->ts); + zfcp_fc_wka_port_force_offline(&gs->ds); + zfcp_fc_wka_port_force_offline(&gs->as); +} + +static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range, + struct fc_els_rscn_page *page) +{ + unsigned long flags; + struct zfcp_adapter *adapter = fsf_req->adapter; + struct zfcp_port *port; + + read_lock_irqsave(&adapter->port_list_lock, flags); + list_for_each_entry(port, &adapter->port_list, list) { + if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range)) + zfcp_fc_test_link(port); + } + read_unlock_irqrestore(&adapter->port_list_lock, flags); +} + +static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req) +{ + struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data; + struct zfcp_adapter *adapter = fsf_req->adapter; + struct fc_els_rscn *head; + struct fc_els_rscn_page *page; + u16 i; + u16 no_entries; + unsigned int afmt; + + head = (struct fc_els_rscn *) status_buffer->payload.data; + page = (struct fc_els_rscn_page *) head; + + /* see FC-FS */ + no_entries = be16_to_cpu(head->rscn_plen) / + sizeof(struct fc_els_rscn_page); + + if (no_entries > 1) { + /* handle failed ports */ + unsigned long flags; + struct zfcp_port *port; + + read_lock_irqsave(&adapter->port_list_lock, flags); + list_for_each_entry(port, &adapter->port_list, list) { + if (port->d_id) + continue; + zfcp_erp_port_reopen(port, + ZFCP_STATUS_COMMON_ERP_FAILED, + "fcrscn1"); + } + read_unlock_irqrestore(&adapter->port_list_lock, flags); + } + + for (i = 1; i < no_entries; i++) { + /* skip head and start with 1st element */ + page++; + afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK; + _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt], + page); + zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN, + *(u32 *)page); + } + zfcp_fc_conditional_port_scan(fsf_req->adapter); +} + +static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn) +{ + unsigned long flags; + struct zfcp_adapter *adapter = req->adapter; + struct zfcp_port *port; + + read_lock_irqsave(&adapter->port_list_lock, flags); + list_for_each_entry(port, &adapter->port_list, list) + if (port->wwpn == wwpn) { + zfcp_erp_port_forced_reopen(port, 0, "fciwwp1"); + break; + } + read_unlock_irqrestore(&adapter->port_list_lock, flags); +} + +static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req) +{ + struct fsf_status_read_buffer *status_buffer; + struct fc_els_flogi *plogi; + + status_buffer = (struct fsf_status_read_buffer *) req->data; + plogi = (struct fc_els_flogi *) status_buffer->payload.data; + zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn)); +} + +static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req) +{ + struct fsf_status_read_buffer *status_buffer = + (struct fsf_status_read_buffer *)req->data; + struct fc_els_logo *logo = + (struct fc_els_logo *) status_buffer->payload.data; + + zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn)); +} + +/** + * zfcp_fc_incoming_els - handle incoming ELS + * @fsf_req - request which contains incoming ELS + */ +void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req) +{ + struct fsf_status_read_buffer *status_buffer = + (struct fsf_status_read_buffer *) fsf_req->data; + unsigned int els_type = status_buffer->payload.data[0]; + + zfcp_dbf_san_in_els("fciels1", fsf_req); + if (els_type == ELS_PLOGI) + zfcp_fc_incoming_plogi(fsf_req); + else if (els_type == ELS_LOGO) + zfcp_fc_incoming_logo(fsf_req); + else if (els_type == ELS_RSCN) + zfcp_fc_incoming_rscn(fsf_req); +} + +static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req) +{ + struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; + struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; + + if (ct_els->status) + return; + if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC)) + return; + + /* looks like a valid d_id */ + ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid); +} + +static void zfcp_fc_complete(void *data) +{ + complete(data); +} + +static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size) +{ + ct_hdr->ct_rev = FC_CT_REV; + ct_hdr->ct_fs_type = FC_FST_DIR; + ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE; + ct_hdr->ct_cmd = cpu_to_be16(cmd); + ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4); +} + +static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port, + struct zfcp_fc_req *fc_req) +{ + struct zfcp_adapter *adapter = port->adapter; + DECLARE_COMPLETION_ONSTACK(completion); + struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req; + struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp; + int ret; + + /* setup parameters for send generic command */ + fc_req->ct_els.port = port; + fc_req->ct_els.handler = zfcp_fc_complete; + fc_req->ct_els.handler_data = &completion; + fc_req->ct_els.req = &fc_req->sg_req; + fc_req->ct_els.resp = &fc_req->sg_rsp; + sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req)); + sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp)); + + zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr, + FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE); + gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn); + + ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els, + adapter->pool.gid_pn_req, + ZFCP_FC_CTELS_TMO); + if (!ret) { + wait_for_completion(&completion); + zfcp_fc_ns_gid_pn_eval(fc_req); + } + return ret; +} + +/** + * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request + * @port: port where GID_PN request is needed + * return: -ENOMEM on error, 0 otherwise + */ +static int zfcp_fc_ns_gid_pn(struct zfcp_port *port) +{ + int ret; + struct zfcp_fc_req *fc_req; + struct zfcp_adapter *adapter = port->adapter; + + fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC); + if (!fc_req) + return -ENOMEM; + + memset(fc_req, 0, sizeof(*fc_req)); + + ret = zfcp_fc_wka_port_get(&adapter->gs->ds); + if (ret) + goto out; + + ret = zfcp_fc_ns_gid_pn_request(port, fc_req); + + zfcp_fc_wka_port_put(&adapter->gs->ds); +out: + mempool_free(fc_req, adapter->pool.gid_pn); + return ret; +} + +void zfcp_fc_port_did_lookup(struct work_struct *work) +{ + int ret; + struct zfcp_port *port = container_of(work, struct zfcp_port, + gid_pn_work); + + set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */ + ret = zfcp_fc_ns_gid_pn(port); + if (ret) { + /* could not issue gid_pn for some reason */ + zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1"); + goto out; + } + + if (!port->d_id) { + zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); + goto out; + } + + zfcp_erp_port_reopen(port, 0, "fcgpn_3"); +out: + put_device(&port->dev); +} + +/** + * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request + * @port: The zfcp_port to lookup the d_id for. + */ +void zfcp_fc_trigger_did_lookup(struct zfcp_port *port) +{ + get_device(&port->dev); + if (!queue_work(port->adapter->work_queue, &port->gid_pn_work)) + put_device(&port->dev); +} + +/** + * zfcp_fc_plogi_evaluate - evaluate PLOGI playload + * @port: zfcp_port structure + * @plogi: plogi payload + * + * Evaluate PLOGI playload and copy important fields into zfcp_port structure + */ +void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi) +{ + if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) { + port->d_id = 0; + dev_warn(&port->adapter->ccw_device->dev, + "A port opened with WWPN 0x%016Lx returned data that " + "identifies it as WWPN 0x%016Lx\n", + (unsigned long long) port->wwpn, + (unsigned long long) be64_to_cpu(plogi->fl_wwpn)); + return; + } + + port->wwnn = be64_to_cpu(plogi->fl_wwnn); + port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data); + + if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID)) + port->supported_classes |= FC_COS_CLASS1; + if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID)) + port->supported_classes |= FC_COS_CLASS2; + if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID)) + port->supported_classes |= FC_COS_CLASS3; + if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID)) + port->supported_classes |= FC_COS_CLASS4; +} + +static void zfcp_fc_adisc_handler(void *data) +{ + struct zfcp_fc_req *fc_req = data; + struct zfcp_port *port = fc_req->ct_els.port; + struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp; + + if (fc_req->ct_els.status) { + /* request rejected or timed out */ + zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, + "fcadh_1"); + goto out; + } + + if (!port->wwnn) + port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn); + + if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) || + !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) { + zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, + "fcadh_2"); + goto out; + } + + /* re-init to undo drop from zfcp_fc_adisc() */ + port->d_id = ntoh24(adisc_resp->adisc_port_id); + /* port is good, unblock rport without going through erp */ + zfcp_scsi_schedule_rport_register(port); + out: + atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); + put_device(&port->dev); + kmem_cache_free(zfcp_fc_req_cache, fc_req); +} + +static int zfcp_fc_adisc(struct zfcp_port *port) +{ + struct zfcp_fc_req *fc_req; + struct zfcp_adapter *adapter = port->adapter; + struct Scsi_Host *shost = adapter->scsi_host; + u32 d_id; + int ret; + + fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC); + if (!fc_req) + return -ENOMEM; + + fc_req->ct_els.port = port; + fc_req->ct_els.req = &fc_req->sg_req; + fc_req->ct_els.resp = &fc_req->sg_rsp; + sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req, + sizeof(struct fc_els_adisc)); + sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp, + sizeof(struct fc_els_adisc)); + + fc_req->ct_els.handler = zfcp_fc_adisc_handler; + fc_req->ct_els.handler_data = fc_req; + + /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports + without FC-AL-2 capability, so we don't set it */ + fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost)); + fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost)); + fc_req->u.adisc.req.adisc_cmd = ELS_ADISC; + hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost)); + + d_id = port->d_id; /* remember as destination for send els below */ + /* + * Force fresh GID_PN lookup on next port recovery. + * Must happen after request setup and before sending request, + * to prevent race with port->d_id re-init in zfcp_fc_adisc_handler(). + */ + port->d_id = 0; + + ret = zfcp_fsf_send_els(adapter, d_id, &fc_req->ct_els, + ZFCP_FC_CTELS_TMO); + if (ret) + kmem_cache_free(zfcp_fc_req_cache, fc_req); + + return ret; +} + +void zfcp_fc_link_test_work(struct work_struct *work) +{ + struct zfcp_port *port = + container_of(work, struct zfcp_port, test_link_work); + int retval; + + set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */ + get_device(&port->dev); + port->rport_task = RPORT_DEL; + zfcp_scsi_rport_work(&port->rport_work); + + /* only issue one test command at one time per port */ + if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST) + goto out; + + atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status); + + retval = zfcp_fc_adisc(port); + if (retval == 0) + return; + + /* send of ADISC was not possible */ + atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status); + zfcp_erp_port_forced_reopen(port, 0, "fcltwk1"); + +out: + put_device(&port->dev); +} + +/** + * zfcp_fc_test_link - lightweight link test procedure + * @port: port to be tested + * + * Test status of a link to a remote port using the ELS command ADISC. + * If there is a problem with the remote port, error recovery steps + * will be triggered. + */ +void zfcp_fc_test_link(struct zfcp_port *port) +{ + get_device(&port->dev); + if (!queue_work(port->adapter->work_queue, &port->test_link_work)) + put_device(&port->dev); +} + +static struct zfcp_fc_req *zfcp_fc_alloc_sg_env(int buf_num) +{ + struct zfcp_fc_req *fc_req; + + fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); + if (!fc_req) + return NULL; + + if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) { + kmem_cache_free(zfcp_fc_req_cache, fc_req); + return NULL; + } + + sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req, + sizeof(struct zfcp_fc_gpn_ft_req)); + + return fc_req; +} + +static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req, + struct zfcp_adapter *adapter, int max_bytes) +{ + struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; + struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req; + DECLARE_COMPLETION_ONSTACK(completion); + int ret; + + zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes); + req->gpn_ft.fn_fc4_type = FC_TYPE_FCP; + + ct_els->handler = zfcp_fc_complete; + ct_els->handler_data = &completion; + ct_els->req = &fc_req->sg_req; + ct_els->resp = &fc_req->sg_rsp; + + ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, + ZFCP_FC_CTELS_TMO); + if (!ret) + wait_for_completion(&completion); + return ret; +} + +static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh) +{ + if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)) + return; + + atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status); + + if ((port->supported_classes != 0) || + !list_empty(&port->unit_list)) + return; + + list_move_tail(&port->list, lh); +} + +static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req, + struct zfcp_adapter *adapter, int max_entries) +{ + struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; + struct scatterlist *sg = &fc_req->sg_rsp; + struct fc_ct_hdr *hdr = sg_virt(sg); + struct fc_gpn_ft_resp *acc = sg_virt(sg); + struct zfcp_port *port, *tmp; + unsigned long flags; + LIST_HEAD(remove_lh); + u32 d_id; + int ret = 0, x, last = 0; + + if (ct_els->status) + return -EIO; + + if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) { + if (hdr->ct_reason == FC_FS_RJT_UNABL) + return -EAGAIN; /* might be a temporary condition */ + return -EIO; + } + + if (hdr->ct_mr_size) { + dev_warn(&adapter->ccw_device->dev, + "The name server reported %d words residual data\n", + hdr->ct_mr_size); + return -E2BIG; + } + + /* first entry is the header */ + for (x = 1; x < max_entries && !last; x++) { + if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) + acc++; + else + acc = sg_virt(++sg); + + last = acc->fp_flags & FC_NS_FID_LAST; + d_id = ntoh24(acc->fp_fid); + + /* don't attach ports with a well known address */ + if (d_id >= FC_FID_WELL_KNOWN_BASE) + continue; + /* skip the adapter's port and known remote ports */ + if (be64_to_cpu(acc->fp_wwpn) == + fc_host_port_name(adapter->scsi_host)) + continue; + + port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn), + ZFCP_STATUS_COMMON_NOESC, d_id); + if (!IS_ERR(port)) + zfcp_erp_port_reopen(port, 0, "fcegpf1"); + else if (PTR_ERR(port) != -EEXIST) + ret = PTR_ERR(port); + } + + zfcp_erp_wait(adapter); + write_lock_irqsave(&adapter->port_list_lock, flags); + list_for_each_entry_safe(port, tmp, &adapter->port_list, list) + zfcp_fc_validate_port(port, &remove_lh); + write_unlock_irqrestore(&adapter->port_list_lock, flags); + + list_for_each_entry_safe(port, tmp, &remove_lh, list) { + zfcp_erp_port_shutdown(port, 0, "fcegpf2"); + device_unregister(&port->dev); + } + + return ret; +} + +/** + * zfcp_fc_scan_ports - scan remote ports and attach new ports + * @work: reference to scheduled work + */ +void zfcp_fc_scan_ports(struct work_struct *work) +{ + struct delayed_work *dw = to_delayed_work(work); + struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter, + scan_work); + int ret, i; + struct zfcp_fc_req *fc_req; + int chain, max_entries, buf_num, max_bytes; + + zfcp_fc_port_scan_time(adapter); + + chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS; + buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1; + max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE; + max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE; + + if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && + fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) + return; + + if (zfcp_fc_wka_port_get(&adapter->gs->ds)) + return; + + fc_req = zfcp_fc_alloc_sg_env(buf_num); + if (!fc_req) + goto out; + + for (i = 0; i < 3; i++) { + ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes); + if (!ret) { + ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries); + if (ret == -EAGAIN) + ssleep(1); + else + break; + } + } + zfcp_sg_free_table(&fc_req->sg_rsp, buf_num); + kmem_cache_free(zfcp_fc_req_cache, fc_req); +out: + zfcp_fc_wka_port_put(&adapter->gs->ds); +} + +static int zfcp_fc_gspn(struct zfcp_adapter *adapter, + struct zfcp_fc_req *fc_req) +{ + DECLARE_COMPLETION_ONSTACK(completion); + char devno[] = "DEVNO:"; + struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; + struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req; + struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp; + int ret; + + zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID, + FC_SYMBOLIC_NAME_SIZE); + hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host)); + + sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req)); + sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp)); + + ct_els->handler = zfcp_fc_complete; + ct_els->handler_data = &completion; + ct_els->req = &fc_req->sg_req; + ct_els->resp = &fc_req->sg_rsp; + + ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, + ZFCP_FC_CTELS_TMO); + if (ret) + return ret; + + wait_for_completion(&completion); + if (ct_els->status) + return ct_els->status; + + if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV && + !(strstr(gspn_rsp->gspn.fp_name, devno))) + snprintf(fc_host_symbolic_name(adapter->scsi_host), + FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s", + gspn_rsp->gspn.fp_name, devno, + dev_name(&adapter->ccw_device->dev), + init_utsname()->nodename); + else + strlcpy(fc_host_symbolic_name(adapter->scsi_host), + gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE); + + return 0; +} + +static void zfcp_fc_rspn(struct zfcp_adapter *adapter, + struct zfcp_fc_req *fc_req) +{ + DECLARE_COMPLETION_ONSTACK(completion); + struct Scsi_Host *shost = adapter->scsi_host; + struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els; + struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req; + struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp; + int ret, len; + + zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID, + FC_SYMBOLIC_NAME_SIZE); + hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost)); + len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost), + FC_SYMBOLIC_NAME_SIZE); + rspn_req->rspn.fr_name_len = len; + + sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req)); + sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp)); + + ct_els->handler = zfcp_fc_complete; + ct_els->handler_data = &completion; + ct_els->req = &fc_req->sg_req; + ct_els->resp = &fc_req->sg_rsp; + + ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL, + ZFCP_FC_CTELS_TMO); + if (!ret) + wait_for_completion(&completion); +} + +/** + * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name + * @work: ns_up_work of the adapter where to update the symbolic port name + * + * Retrieve the current symbolic port name that may have been set by + * the hardware using the GSPN request and update the fc_host + * symbolic_name sysfs attribute. When running in NPIV mode (and hence + * the port name is unique for this system), update the symbolic port + * name to add Linux specific information and update the FC nameserver + * using the RSPN request. + */ +void zfcp_fc_sym_name_update(struct work_struct *work) +{ + struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, + ns_up_work); + int ret; + struct zfcp_fc_req *fc_req; + + if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT && + fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) + return; + + fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL); + if (!fc_req) + return; + + ret = zfcp_fc_wka_port_get(&adapter->gs->ds); + if (ret) + goto out_free; + + ret = zfcp_fc_gspn(adapter, fc_req); + if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV) + goto out_ds_put; + + memset(fc_req, 0, sizeof(*fc_req)); + zfcp_fc_rspn(adapter, fc_req); + +out_ds_put: + zfcp_fc_wka_port_put(&adapter->gs->ds); +out_free: + kmem_cache_free(zfcp_fc_req_cache, fc_req); +} + +static void zfcp_fc_ct_els_job_handler(void *data) +{ + struct bsg_job *job = data; + struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data; + struct fc_bsg_reply *jr = job->reply; + + jr->reply_payload_rcv_len = job->reply_payload.payload_len; + jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK; + jr->result = zfcp_ct_els->status ? -EIO : 0; + bsg_job_done(job, jr->result, jr->reply_payload_rcv_len); +} + +static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job) +{ + u32 preamble_word1; + u8 gs_type; + struct zfcp_adapter *adapter; + struct fc_bsg_request *bsg_request = job->request; + struct fc_rport *rport = fc_bsg_to_rport(job); + struct Scsi_Host *shost; + + preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1; + gs_type = (preamble_word1 & 0xff000000) >> 24; + + shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); + adapter = (struct zfcp_adapter *) shost->hostdata[0]; + + switch (gs_type) { + case FC_FST_ALIAS: + return &adapter->gs->as; + case FC_FST_MGMT: + return &adapter->gs->ms; + case FC_FST_TIME: + return &adapter->gs->ts; + break; + case FC_FST_DIR: + return &adapter->gs->ds; + break; + default: + return NULL; + } +} + +static void zfcp_fc_ct_job_handler(void *data) +{ + struct bsg_job *job = data; + struct zfcp_fc_wka_port *wka_port; + + wka_port = zfcp_fc_job_wka_port(job); + zfcp_fc_wka_port_put(wka_port); + + zfcp_fc_ct_els_job_handler(data); +} + +static int zfcp_fc_exec_els_job(struct bsg_job *job, + struct zfcp_adapter *adapter) +{ + struct zfcp_fsf_ct_els *els = job->dd_data; + struct fc_rport *rport = fc_bsg_to_rport(job); + struct fc_bsg_request *bsg_request = job->request; + struct zfcp_port *port; + u32 d_id; + + if (rport) { + port = zfcp_get_port_by_wwpn(adapter, rport->port_name); + if (!port) + return -EINVAL; + + d_id = port->d_id; + put_device(&port->dev); + } else + d_id = ntoh24(bsg_request->rqst_data.h_els.port_id); + + els->handler = zfcp_fc_ct_els_job_handler; + return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ); +} + +static int zfcp_fc_exec_ct_job(struct bsg_job *job, + struct zfcp_adapter *adapter) +{ + int ret; + struct zfcp_fsf_ct_els *ct = job->dd_data; + struct zfcp_fc_wka_port *wka_port; + + wka_port = zfcp_fc_job_wka_port(job); + if (!wka_port) + return -EINVAL; + + ret = zfcp_fc_wka_port_get(wka_port); + if (ret) + return ret; + + ct->handler = zfcp_fc_ct_job_handler; + ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ); + if (ret) + zfcp_fc_wka_port_put(wka_port); + + return ret; +} + +int zfcp_fc_exec_bsg_job(struct bsg_job *job) +{ + struct Scsi_Host *shost; + struct zfcp_adapter *adapter; + struct zfcp_fsf_ct_els *ct_els = job->dd_data; + struct fc_bsg_request *bsg_request = job->request; + struct fc_rport *rport = fc_bsg_to_rport(job); + + shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job); + adapter = (struct zfcp_adapter *)shost->hostdata[0]; + + if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN)) + return -EINVAL; + + ct_els->req = job->request_payload.sg_list; + ct_els->resp = job->reply_payload.sg_list; + ct_els->handler_data = job; + + switch (bsg_request->msgcode) { + case FC_BSG_RPT_ELS: + case FC_BSG_HST_ELS_NOLOGIN: + return zfcp_fc_exec_els_job(job, adapter); + case FC_BSG_RPT_CT: + case FC_BSG_HST_CT: + return zfcp_fc_exec_ct_job(job, adapter); + default: + return -EINVAL; + } +} + +int zfcp_fc_timeout_bsg_job(struct bsg_job *job) +{ + /* hardware tracks timeout, reset bsg timeout to not interfere */ + return -EAGAIN; +} + +int zfcp_fc_gs_setup(struct zfcp_adapter *adapter) +{ + struct zfcp_fc_wka_ports *wka_ports; + + wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL); + if (!wka_ports) + return -ENOMEM; + + adapter->gs = wka_ports; + zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter); + zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter); + zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter); + zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter); + + return 0; +} + +void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter) +{ + kfree(adapter->gs); + adapter->gs = NULL; +} + diff --git a/drivers/s390/scsi/zfcp_fc.h b/drivers/s390/scsi/zfcp_fc.h new file mode 100644 index 000000000..3cd74729c --- /dev/null +++ b/drivers/s390/scsi/zfcp_fc.h @@ -0,0 +1,301 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * zfcp device driver + * + * Fibre Channel related definitions and inline functions for the zfcp + * device driver + * + * Copyright IBM Corp. 2009, 2017 + */ + +#ifndef ZFCP_FC_H +#define ZFCP_FC_H + +#include +#include +#include +#include +#include +#include "zfcp_fsf.h" + +#define ZFCP_FC_CT_SIZE_PAGE (PAGE_SIZE - sizeof(struct fc_ct_hdr)) +#define ZFCP_FC_GPN_FT_ENT_PAGE (ZFCP_FC_CT_SIZE_PAGE \ + / sizeof(struct fc_gpn_ft_resp)) +#define ZFCP_FC_GPN_FT_NUM_BUFS 4 /* memory pages */ + +#define ZFCP_FC_GPN_FT_MAX_SIZE (ZFCP_FC_GPN_FT_NUM_BUFS * PAGE_SIZE \ + - sizeof(struct fc_ct_hdr)) +#define ZFCP_FC_GPN_FT_MAX_ENT (ZFCP_FC_GPN_FT_NUM_BUFS * \ + (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) + +#define ZFCP_FC_CTELS_TMO (2 * FC_DEF_R_A_TOV / 1000) + +/** + * struct zfcp_fc_event - FC HBAAPI event for internal queueing from irq context + * @code: Event code + * @data: Event data + * @list: list_head for zfcp_fc_events list + */ +struct zfcp_fc_event { + enum fc_host_event_code code; + u32 data; + struct list_head list; +}; + +/** + * struct zfcp_fc_events - Infrastructure for posting FC events from irq context + * @list: List for queueing of events from irq context to workqueue + * @list_lock: Lock for event list + * @work: work_struct for forwarding events in workqueue +*/ +struct zfcp_fc_events { + struct list_head list; + spinlock_t list_lock; + struct work_struct work; +}; + +/** + * struct zfcp_fc_gid_pn_req - container for ct header plus gid_pn request + * @ct_hdr: FC GS common transport header + * @gid_pn: GID_PN request + */ +struct zfcp_fc_gid_pn_req { + struct fc_ct_hdr ct_hdr; + struct fc_ns_gid_pn gid_pn; +} __packed; + +/** + * struct zfcp_fc_gid_pn_rsp - container for ct header plus gid_pn response + * @ct_hdr: FC GS common transport header + * @gid_pn: GID_PN response + */ +struct zfcp_fc_gid_pn_rsp { + struct fc_ct_hdr ct_hdr; + struct fc_gid_pn_resp gid_pn; +} __packed; + +/** + * struct zfcp_fc_gpn_ft - container for ct header plus gpn_ft request + * @ct_hdr: FC GS common transport header + * @gpn_ft: GPN_FT request + */ +struct zfcp_fc_gpn_ft_req { + struct fc_ct_hdr ct_hdr; + struct fc_ns_gid_ft gpn_ft; +} __packed; + +/** + * struct zfcp_fc_gspn_req - container for ct header plus GSPN_ID request + * @ct_hdr: FC GS common transport header + * @gspn: GSPN_ID request + */ +struct zfcp_fc_gspn_req { + struct fc_ct_hdr ct_hdr; + struct fc_gid_pn_resp gspn; +} __packed; + +/** + * struct zfcp_fc_gspn_rsp - container for ct header plus GSPN_ID response + * @ct_hdr: FC GS common transport header + * @gspn: GSPN_ID response + * @name: The name string of the GSPN_ID response + */ +struct zfcp_fc_gspn_rsp { + struct fc_ct_hdr ct_hdr; + struct fc_gspn_resp gspn; + char name[FC_SYMBOLIC_NAME_SIZE]; +} __packed; + +/** + * struct zfcp_fc_rspn_req - container for ct header plus RSPN_ID request + * @ct_hdr: FC GS common transport header + * @rspn: RSPN_ID request + * @name: The name string of the RSPN_ID request + */ +struct zfcp_fc_rspn_req { + struct fc_ct_hdr ct_hdr; + struct fc_ns_rspn rspn; + char name[FC_SYMBOLIC_NAME_SIZE]; +} __packed; + +/** + * struct zfcp_fc_req - Container for FC ELS and CT requests sent from zfcp + * @ct_els: data required for issuing fsf command + * @sg_req: scatterlist entry for request data + * @sg_rsp: scatterlist entry for response data + * @u: request specific data + */ +struct zfcp_fc_req { + struct zfcp_fsf_ct_els ct_els; + struct scatterlist sg_req; + struct scatterlist sg_rsp; + union { + struct { + struct fc_els_adisc req; + struct fc_els_adisc rsp; + } adisc; + struct { + struct zfcp_fc_gid_pn_req req; + struct zfcp_fc_gid_pn_rsp rsp; + } gid_pn; + struct { + struct scatterlist sg_rsp2[ZFCP_FC_GPN_FT_NUM_BUFS - 1]; + struct zfcp_fc_gpn_ft_req req; + } gpn_ft; + struct { + struct zfcp_fc_gspn_req req; + struct zfcp_fc_gspn_rsp rsp; + } gspn; + struct { + struct zfcp_fc_rspn_req req; + struct fc_ct_hdr rsp; + } rspn; + } u; +}; + +/** + * enum zfcp_fc_wka_status - FC WKA port status in zfcp + * @ZFCP_FC_WKA_PORT_OFFLINE: Port is closed and not in use + * @ZFCP_FC_WKA_PORT_CLOSING: The FSF "close port" request is pending + * @ZFCP_FC_WKA_PORT_OPENING: The FSF "open port" request is pending + * @ZFCP_FC_WKA_PORT_ONLINE: The port is open and the port handle is valid + */ +enum zfcp_fc_wka_status { + ZFCP_FC_WKA_PORT_OFFLINE, + ZFCP_FC_WKA_PORT_CLOSING, + ZFCP_FC_WKA_PORT_OPENING, + ZFCP_FC_WKA_PORT_ONLINE, +}; + +/** + * struct zfcp_fc_wka_port - representation of well-known-address (WKA) FC port + * @adapter: Pointer to adapter structure this WKA port belongs to + * @completion_wq: Wait for completion of open/close command + * @status: Current status of WKA port + * @refcount: Reference count to keep port open as long as it is in use + * @d_id: FC destination id or well-known-address + * @handle: FSF handle for the open WKA port + * @mutex: Mutex used during opening/closing state changes + * @work: For delaying the closing of the WKA port + */ +struct zfcp_fc_wka_port { + struct zfcp_adapter *adapter; + wait_queue_head_t completion_wq; + enum zfcp_fc_wka_status status; + atomic_t refcount; + u32 d_id; + u32 handle; + struct mutex mutex; + struct delayed_work work; +}; + +/** + * struct zfcp_fc_wka_ports - Data structures for FC generic services + * @ms: FC Management service + * @ts: FC time service + * @ds: FC directory service + * @as: FC alias service + */ +struct zfcp_fc_wka_ports { + struct zfcp_fc_wka_port ms; + struct zfcp_fc_wka_port ts; + struct zfcp_fc_wka_port ds; + struct zfcp_fc_wka_port as; +}; + +/** + * zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd + * @fcp: fcp_cmnd to setup + * @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB + */ +static inline +void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi) +{ + u32 datalen; + + int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun); + + fcp->fc_pri_ta = FCP_PTA_SIMPLE; + + if (scsi->sc_data_direction == DMA_FROM_DEVICE) + fcp->fc_flags |= FCP_CFL_RDDATA; + if (scsi->sc_data_direction == DMA_TO_DEVICE) + fcp->fc_flags |= FCP_CFL_WRDATA; + + memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len); + + datalen = scsi_bufflen(scsi); + fcp->fc_dl = cpu_to_be32(datalen); + + if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1) { + datalen += datalen / scsi->device->sector_size * 8; + fcp->fc_dl = cpu_to_be32(datalen); + } +} + +/** + * zfcp_fc_fcp_tm() - Setup FCP command as task management command. + * @fcp: Pointer to FCP_CMND IU to set up. + * @dev: Pointer to SCSI_device where to send the task management command. + * @tm_flags: Task management flags to setup tm command. + */ +static inline +void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags) +{ + int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun); + fcp->fc_tm_flags = tm_flags; +} + +/** + * zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly + * @fcp_rsp: FCP RSP IU to evaluate + * @scsi: SCSI command where to update status and sense buffer + */ +static inline +void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp, + struct scsi_cmnd *scsi) +{ + struct fcp_resp_rsp_info *rsp_info; + char *sense; + u32 sense_len, resid; + u8 rsp_flags; + + set_msg_byte(scsi, COMMAND_COMPLETE); + scsi->result |= fcp_rsp->resp.fr_status; + + rsp_flags = fcp_rsp->resp.fr_flags; + + if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) { + rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1]; + if (rsp_info->rsp_code == FCP_TMF_CMPL) + set_host_byte(scsi, DID_OK); + else { + set_host_byte(scsi, DID_ERROR); + return; + } + } + + if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) { + sense = (char *) &fcp_rsp[1]; + if (rsp_flags & FCP_RSP_LEN_VAL) + sense += be32_to_cpu(fcp_rsp->ext.fr_rsp_len); + sense_len = min_t(u32, be32_to_cpu(fcp_rsp->ext.fr_sns_len), + SCSI_SENSE_BUFFERSIZE); + memcpy(scsi->sense_buffer, sense, sense_len); + } + + if (unlikely(rsp_flags & FCP_RESID_UNDER)) { + resid = be32_to_cpu(fcp_rsp->ext.fr_resid); + scsi_set_resid(scsi, resid); + if (scsi_bufflen(scsi) - resid < scsi->underflow && + !(rsp_flags & FCP_SNS_LEN_VAL) && + fcp_rsp->resp.fr_status == SAM_STAT_GOOD) + set_host_byte(scsi, DID_ERROR); + } else if (unlikely(rsp_flags & FCP_RESID_OVER)) { + /* FCP_DL was not sufficient for SCSI data length */ + if (fcp_rsp->resp.fr_status == SAM_STAT_GOOD) + set_host_byte(scsi, DID_ERROR); + } +} + +#endif diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c new file mode 100644 index 000000000..5bb278a60 --- /dev/null +++ b/drivers/s390/scsi/zfcp_fsf.c @@ -0,0 +1,2431 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * Implementation of FSF commands. + * + * Copyright IBM Corp. 2002, 2018 + */ + +#define KMSG_COMPONENT "zfcp" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include "zfcp_ext.h" +#include "zfcp_fc.h" +#include "zfcp_dbf.h" +#include "zfcp_qdio.h" +#include "zfcp_reqlist.h" + +struct kmem_cache *zfcp_fsf_qtcb_cache; + +static bool ber_stop = true; +module_param(ber_stop, bool, 0600); +MODULE_PARM_DESC(ber_stop, + "Shuts down FCP devices for FCP channels that report a bit-error count in excess of its threshold (default on)"); + +static void zfcp_fsf_request_timeout_handler(struct timer_list *t) +{ + struct zfcp_fsf_req *fsf_req = from_timer(fsf_req, t, timer); + struct zfcp_adapter *adapter = fsf_req->adapter; + + zfcp_qdio_siosl(adapter); + zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, + "fsrth_1"); +} + +static void zfcp_fsf_start_timer(struct zfcp_fsf_req *fsf_req, + unsigned long timeout) +{ + fsf_req->timer.function = zfcp_fsf_request_timeout_handler; + fsf_req->timer.expires = jiffies + timeout; + add_timer(&fsf_req->timer); +} + +static void zfcp_fsf_start_erp_timer(struct zfcp_fsf_req *fsf_req) +{ + BUG_ON(!fsf_req->erp_action); + fsf_req->timer.function = zfcp_erp_timeout_handler; + fsf_req->timer.expires = jiffies + 30 * HZ; + add_timer(&fsf_req->timer); +} + +/* association between FSF command and FSF QTCB type */ +static u32 fsf_qtcb_type[] = { + [FSF_QTCB_FCP_CMND] = FSF_IO_COMMAND, + [FSF_QTCB_ABORT_FCP_CMND] = FSF_SUPPORT_COMMAND, + [FSF_QTCB_OPEN_PORT_WITH_DID] = FSF_SUPPORT_COMMAND, + [FSF_QTCB_OPEN_LUN] = FSF_SUPPORT_COMMAND, + [FSF_QTCB_CLOSE_LUN] = FSF_SUPPORT_COMMAND, + [FSF_QTCB_CLOSE_PORT] = FSF_SUPPORT_COMMAND, + [FSF_QTCB_CLOSE_PHYSICAL_PORT] = FSF_SUPPORT_COMMAND, + [FSF_QTCB_SEND_ELS] = FSF_SUPPORT_COMMAND, + [FSF_QTCB_SEND_GENERIC] = FSF_SUPPORT_COMMAND, + [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND, + [FSF_QTCB_EXCHANGE_PORT_DATA] = FSF_PORT_COMMAND, + [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND, + [FSF_QTCB_UPLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND +}; + +static void zfcp_fsf_class_not_supp(struct zfcp_fsf_req *req) +{ + dev_err(&req->adapter->ccw_device->dev, "FCP device not " + "operational because of an unsupported FC class\n"); + zfcp_erp_adapter_shutdown(req->adapter, 0, "fscns_1"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; +} + +/** + * zfcp_fsf_req_free - free memory used by fsf request + * @fsf_req: pointer to struct zfcp_fsf_req + */ +void zfcp_fsf_req_free(struct zfcp_fsf_req *req) +{ + if (likely(req->pool)) { + if (likely(req->qtcb)) + mempool_free(req->qtcb, req->adapter->pool.qtcb_pool); + mempool_free(req, req->pool); + return; + } + + if (likely(req->qtcb)) + kmem_cache_free(zfcp_fsf_qtcb_cache, req->qtcb); + kfree(req); +} + +static void zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *req) +{ + unsigned long flags; + struct fsf_status_read_buffer *sr_buf = req->data; + struct zfcp_adapter *adapter = req->adapter; + struct zfcp_port *port; + int d_id = ntoh24(sr_buf->d_id); + + read_lock_irqsave(&adapter->port_list_lock, flags); + list_for_each_entry(port, &adapter->port_list, list) + if (port->d_id == d_id) { + zfcp_erp_port_reopen(port, 0, "fssrpc1"); + break; + } + read_unlock_irqrestore(&adapter->port_list_lock, flags); +} + +static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req, + struct fsf_link_down_info *link_down) +{ + struct zfcp_adapter *adapter = req->adapter; + + if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) + return; + + atomic_or(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status); + + zfcp_scsi_schedule_rports_block(adapter); + + if (!link_down) + goto out; + + switch (link_down->error_code) { + case FSF_PSQ_LINK_NO_LIGHT: + dev_warn(&req->adapter->ccw_device->dev, + "There is no light signal from the local " + "fibre channel cable\n"); + break; + case FSF_PSQ_LINK_WRAP_PLUG: + dev_warn(&req->adapter->ccw_device->dev, + "There is a wrap plug instead of a fibre " + "channel cable\n"); + break; + case FSF_PSQ_LINK_NO_FCP: + dev_warn(&req->adapter->ccw_device->dev, + "The adjacent fibre channel node does not " + "support FCP\n"); + break; + case FSF_PSQ_LINK_FIRMWARE_UPDATE: + dev_warn(&req->adapter->ccw_device->dev, + "The FCP device is suspended because of a " + "firmware update\n"); + break; + case FSF_PSQ_LINK_INVALID_WWPN: + dev_warn(&req->adapter->ccw_device->dev, + "The FCP device detected a WWPN that is " + "duplicate or not valid\n"); + break; + case FSF_PSQ_LINK_NO_NPIV_SUPPORT: + dev_warn(&req->adapter->ccw_device->dev, + "The fibre channel fabric does not support NPIV\n"); + break; + case FSF_PSQ_LINK_NO_FCP_RESOURCES: + dev_warn(&req->adapter->ccw_device->dev, + "The FCP adapter cannot support more NPIV ports\n"); + break; + case FSF_PSQ_LINK_NO_FABRIC_RESOURCES: + dev_warn(&req->adapter->ccw_device->dev, + "The adjacent switch cannot support " + "more NPIV ports\n"); + break; + case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE: + dev_warn(&req->adapter->ccw_device->dev, + "The FCP adapter could not log in to the " + "fibre channel fabric\n"); + break; + case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED: + dev_warn(&req->adapter->ccw_device->dev, + "The WWPN assignment file on the FCP adapter " + "has been damaged\n"); + break; + case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED: + dev_warn(&req->adapter->ccw_device->dev, + "The mode table on the FCP adapter " + "has been damaged\n"); + break; + case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT: + dev_warn(&req->adapter->ccw_device->dev, + "All NPIV ports on the FCP adapter have " + "been assigned\n"); + break; + default: + dev_warn(&req->adapter->ccw_device->dev, + "The link between the FCP adapter and " + "the FC fabric is down\n"); + } +out: + zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_ERP_FAILED); +} + +static void zfcp_fsf_status_read_link_down(struct zfcp_fsf_req *req) +{ + struct fsf_status_read_buffer *sr_buf = req->data; + struct fsf_link_down_info *ldi = + (struct fsf_link_down_info *) &sr_buf->payload; + + switch (sr_buf->status_subtype) { + case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK: + case FSF_STATUS_READ_SUB_FDISC_FAILED: + zfcp_fsf_link_down_info_eval(req, ldi); + break; + case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE: + zfcp_fsf_link_down_info_eval(req, NULL); + } +} + +static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req) +{ + struct zfcp_adapter *adapter = req->adapter; + struct fsf_status_read_buffer *sr_buf = req->data; + + if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) { + zfcp_dbf_hba_fsf_uss("fssrh_1", req); + mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data); + zfcp_fsf_req_free(req); + return; + } + + zfcp_dbf_hba_fsf_uss("fssrh_4", req); + + switch (sr_buf->status_type) { + case FSF_STATUS_READ_PORT_CLOSED: + zfcp_fsf_status_read_port_closed(req); + break; + case FSF_STATUS_READ_INCOMING_ELS: + zfcp_fc_incoming_els(req); + break; + case FSF_STATUS_READ_SENSE_DATA_AVAIL: + break; + case FSF_STATUS_READ_BIT_ERROR_THRESHOLD: + zfcp_dbf_hba_bit_err("fssrh_3", req); + if (ber_stop) { + dev_warn(&adapter->ccw_device->dev, + "All paths over this FCP device are disused because of excessive bit errors\n"); + zfcp_erp_adapter_shutdown(adapter, 0, "fssrh_b"); + } else { + dev_warn(&adapter->ccw_device->dev, + "The error threshold for checksum statistics has been exceeded\n"); + } + break; + case FSF_STATUS_READ_LINK_DOWN: + zfcp_fsf_status_read_link_down(req); + zfcp_fc_enqueue_event(adapter, FCH_EVT_LINKDOWN, 0); + break; + case FSF_STATUS_READ_LINK_UP: + dev_info(&adapter->ccw_device->dev, + "The local link has been restored\n"); + /* All ports should be marked as ready to run again */ + zfcp_erp_set_adapter_status(adapter, + ZFCP_STATUS_COMMON_RUNNING); + zfcp_erp_adapter_reopen(adapter, + ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED | + ZFCP_STATUS_COMMON_ERP_FAILED, + "fssrh_2"); + zfcp_fc_enqueue_event(adapter, FCH_EVT_LINKUP, 0); + + break; + case FSF_STATUS_READ_NOTIFICATION_LOST: + if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS) + zfcp_fc_conditional_port_scan(adapter); + break; + case FSF_STATUS_READ_FEATURE_UPDATE_ALERT: + adapter->adapter_features = sr_buf->payload.word[0]; + break; + } + + mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data); + zfcp_fsf_req_free(req); + + atomic_inc(&adapter->stat_miss); + queue_work(adapter->work_queue, &adapter->stat_work); +} + +static void zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *req) +{ + switch (req->qtcb->header.fsf_status_qual.word[0]) { + case FSF_SQ_FCP_RSP_AVAILABLE: + case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE: + case FSF_SQ_NO_RETRY_POSSIBLE: + case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED: + return; + case FSF_SQ_COMMAND_ABORTED: + break; + case FSF_SQ_NO_RECOM: + dev_err(&req->adapter->ccw_device->dev, + "The FCP adapter reported a problem " + "that cannot be recovered\n"); + zfcp_qdio_siosl(req->adapter); + zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfsqe1"); + break; + } + /* all non-return stats set FSFREQ_ERROR*/ + req->status |= ZFCP_STATUS_FSFREQ_ERROR; +} + +static void zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *req) +{ + if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) + return; + + switch (req->qtcb->header.fsf_status) { + case FSF_UNKNOWN_COMMAND: + dev_err(&req->adapter->ccw_device->dev, + "The FCP adapter does not recognize the command 0x%x\n", + req->qtcb->header.fsf_command); + zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfse_1"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_ADAPTER_STATUS_AVAILABLE: + zfcp_fsf_fsfstatus_qual_eval(req); + break; + } +} + +static void zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *req) +{ + struct zfcp_adapter *adapter = req->adapter; + struct fsf_qtcb *qtcb = req->qtcb; + union fsf_prot_status_qual *psq = &qtcb->prefix.prot_status_qual; + + zfcp_dbf_hba_fsf_response(req); + + if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) { + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + return; + } + + switch (qtcb->prefix.prot_status) { + case FSF_PROT_GOOD: + case FSF_PROT_FSF_STATUS_PRESENTED: + return; + case FSF_PROT_QTCB_VERSION_ERROR: + dev_err(&adapter->ccw_device->dev, + "QTCB version 0x%x not supported by FCP adapter " + "(0x%x to 0x%x)\n", FSF_QTCB_CURRENT_VERSION, + psq->word[0], psq->word[1]); + zfcp_erp_adapter_shutdown(adapter, 0, "fspse_1"); + break; + case FSF_PROT_ERROR_STATE: + case FSF_PROT_SEQ_NUMB_ERROR: + zfcp_erp_adapter_reopen(adapter, 0, "fspse_2"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_PROT_UNSUPP_QTCB_TYPE: + dev_err(&adapter->ccw_device->dev, + "The QTCB type is not supported by the FCP adapter\n"); + zfcp_erp_adapter_shutdown(adapter, 0, "fspse_3"); + break; + case FSF_PROT_HOST_CONNECTION_INITIALIZING: + atomic_or(ZFCP_STATUS_ADAPTER_HOST_CON_INIT, + &adapter->status); + break; + case FSF_PROT_DUPLICATE_REQUEST_ID: + dev_err(&adapter->ccw_device->dev, + "0x%Lx is an ambiguous request identifier\n", + (unsigned long long)qtcb->bottom.support.req_handle); + zfcp_erp_adapter_shutdown(adapter, 0, "fspse_4"); + break; + case FSF_PROT_LINK_DOWN: + zfcp_fsf_link_down_info_eval(req, &psq->link_down_info); + /* go through reopen to flush pending requests */ + zfcp_erp_adapter_reopen(adapter, 0, "fspse_6"); + break; + case FSF_PROT_REEST_QUEUE: + /* All ports should be marked as ready to run again */ + zfcp_erp_set_adapter_status(adapter, + ZFCP_STATUS_COMMON_RUNNING); + zfcp_erp_adapter_reopen(adapter, + ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED | + ZFCP_STATUS_COMMON_ERP_FAILED, + "fspse_8"); + break; + default: + dev_err(&adapter->ccw_device->dev, + "0x%x is not a valid transfer protocol status\n", + qtcb->prefix.prot_status); + zfcp_qdio_siosl(adapter); + zfcp_erp_adapter_shutdown(adapter, 0, "fspse_9"); + } + req->status |= ZFCP_STATUS_FSFREQ_ERROR; +} + +/** + * zfcp_fsf_req_complete - process completion of a FSF request + * @fsf_req: The FSF request that has been completed. + * + * When a request has been completed either from the FCP adapter, + * or it has been dismissed due to a queue shutdown, this function + * is called to process the completion status and trigger further + * events related to the FSF request. + */ +static void zfcp_fsf_req_complete(struct zfcp_fsf_req *req) +{ + if (unlikely(req->fsf_command == FSF_QTCB_UNSOLICITED_STATUS)) { + zfcp_fsf_status_read_handler(req); + return; + } + + del_timer_sync(&req->timer); + zfcp_fsf_protstatus_eval(req); + zfcp_fsf_fsfstatus_eval(req); + req->handler(req); + + if (req->erp_action) + zfcp_erp_notify(req->erp_action, 0); + + if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP)) + zfcp_fsf_req_free(req); + else + complete(&req->completion); +} + +/** + * zfcp_fsf_req_dismiss_all - dismiss all fsf requests + * @adapter: pointer to struct zfcp_adapter + * + * Never ever call this without shutting down the adapter first. + * Otherwise the adapter would continue using and corrupting s390 storage. + * Included BUG_ON() call to ensure this is done. + * ERP is supposed to be the only user of this function. + */ +void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter) +{ + struct zfcp_fsf_req *req, *tmp; + LIST_HEAD(remove_queue); + + BUG_ON(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP); + zfcp_reqlist_move(adapter->req_list, &remove_queue); + + list_for_each_entry_safe(req, tmp, &remove_queue, list) { + list_del(&req->list); + req->status |= ZFCP_STATUS_FSFREQ_DISMISSED; + zfcp_fsf_req_complete(req); + } +} + +#define ZFCP_FSF_PORTSPEED_1GBIT (1 << 0) +#define ZFCP_FSF_PORTSPEED_2GBIT (1 << 1) +#define ZFCP_FSF_PORTSPEED_4GBIT (1 << 2) +#define ZFCP_FSF_PORTSPEED_10GBIT (1 << 3) +#define ZFCP_FSF_PORTSPEED_8GBIT (1 << 4) +#define ZFCP_FSF_PORTSPEED_16GBIT (1 << 5) +#define ZFCP_FSF_PORTSPEED_32GBIT (1 << 6) +#define ZFCP_FSF_PORTSPEED_64GBIT (1 << 7) +#define ZFCP_FSF_PORTSPEED_128GBIT (1 << 8) +#define ZFCP_FSF_PORTSPEED_NOT_NEGOTIATED (1 << 15) + +static u32 zfcp_fsf_convert_portspeed(u32 fsf_speed) +{ + u32 fdmi_speed = 0; + if (fsf_speed & ZFCP_FSF_PORTSPEED_1GBIT) + fdmi_speed |= FC_PORTSPEED_1GBIT; + if (fsf_speed & ZFCP_FSF_PORTSPEED_2GBIT) + fdmi_speed |= FC_PORTSPEED_2GBIT; + if (fsf_speed & ZFCP_FSF_PORTSPEED_4GBIT) + fdmi_speed |= FC_PORTSPEED_4GBIT; + if (fsf_speed & ZFCP_FSF_PORTSPEED_10GBIT) + fdmi_speed |= FC_PORTSPEED_10GBIT; + if (fsf_speed & ZFCP_FSF_PORTSPEED_8GBIT) + fdmi_speed |= FC_PORTSPEED_8GBIT; + if (fsf_speed & ZFCP_FSF_PORTSPEED_16GBIT) + fdmi_speed |= FC_PORTSPEED_16GBIT; + if (fsf_speed & ZFCP_FSF_PORTSPEED_32GBIT) + fdmi_speed |= FC_PORTSPEED_32GBIT; + if (fsf_speed & ZFCP_FSF_PORTSPEED_64GBIT) + fdmi_speed |= FC_PORTSPEED_64GBIT; + if (fsf_speed & ZFCP_FSF_PORTSPEED_128GBIT) + fdmi_speed |= FC_PORTSPEED_128GBIT; + if (fsf_speed & ZFCP_FSF_PORTSPEED_NOT_NEGOTIATED) + fdmi_speed |= FC_PORTSPEED_NOT_NEGOTIATED; + return fdmi_speed; +} + +static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req) +{ + struct fsf_qtcb_bottom_config *bottom = &req->qtcb->bottom.config; + struct zfcp_adapter *adapter = req->adapter; + struct Scsi_Host *shost = adapter->scsi_host; + struct fc_els_flogi *nsp, *plogi; + + /* adjust pointers for missing command code */ + nsp = (struct fc_els_flogi *) ((u8 *)&bottom->nport_serv_param + - sizeof(u32)); + plogi = (struct fc_els_flogi *) ((u8 *)&bottom->plogi_payload + - sizeof(u32)); + + if (req->data) + memcpy(req->data, bottom, sizeof(*bottom)); + + fc_host_port_name(shost) = be64_to_cpu(nsp->fl_wwpn); + fc_host_node_name(shost) = be64_to_cpu(nsp->fl_wwnn); + fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3; + + adapter->timer_ticks = bottom->timer_interval & ZFCP_FSF_TIMER_INT_MASK; + adapter->stat_read_buf_num = max(bottom->status_read_buf_num, + (u16)FSF_STATUS_READS_RECOM); + + if (fc_host_permanent_port_name(shost) == -1) + fc_host_permanent_port_name(shost) = fc_host_port_name(shost); + + zfcp_scsi_set_prot(adapter); + + /* no error return above here, otherwise must fix call chains */ + /* do not evaluate invalid fields */ + if (req->qtcb->header.fsf_status == FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE) + return 0; + + fc_host_port_id(shost) = ntoh24(bottom->s_id); + fc_host_speed(shost) = + zfcp_fsf_convert_portspeed(bottom->fc_link_speed); + + adapter->hydra_version = bottom->adapter_type; + + switch (bottom->fc_topology) { + case FSF_TOPO_P2P: + adapter->peer_d_id = ntoh24(bottom->peer_d_id); + adapter->peer_wwpn = be64_to_cpu(plogi->fl_wwpn); + adapter->peer_wwnn = be64_to_cpu(plogi->fl_wwnn); + fc_host_port_type(shost) = FC_PORTTYPE_PTP; + break; + case FSF_TOPO_FABRIC: + if (bottom->connection_features & FSF_FEATURE_NPIV_MODE) + fc_host_port_type(shost) = FC_PORTTYPE_NPIV; + else + fc_host_port_type(shost) = FC_PORTTYPE_NPORT; + break; + case FSF_TOPO_AL: + fc_host_port_type(shost) = FC_PORTTYPE_NLPORT; + /* fall through */ + default: + dev_err(&adapter->ccw_device->dev, + "Unknown or unsupported arbitrated loop " + "fibre channel topology detected\n"); + zfcp_erp_adapter_shutdown(adapter, 0, "fsece_1"); + return -EIO; + } + + return 0; +} + +static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req) +{ + struct zfcp_adapter *adapter = req->adapter; + struct fsf_qtcb *qtcb = req->qtcb; + struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config; + struct Scsi_Host *shost = adapter->scsi_host; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + return; + + adapter->fsf_lic_version = bottom->lic_version; + adapter->adapter_features = bottom->adapter_features; + adapter->connection_features = bottom->connection_features; + adapter->peer_wwpn = 0; + adapter->peer_wwnn = 0; + adapter->peer_d_id = 0; + + switch (qtcb->header.fsf_status) { + case FSF_GOOD: + if (zfcp_fsf_exchange_config_evaluate(req)) + return; + + if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) { + dev_err(&adapter->ccw_device->dev, + "FCP adapter maximum QTCB size (%d bytes) " + "is too small\n", + bottom->max_qtcb_size); + zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh1"); + return; + } + atomic_or(ZFCP_STATUS_ADAPTER_XCONFIG_OK, + &adapter->status); + break; + case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE: + fc_host_node_name(shost) = 0; + fc_host_port_name(shost) = 0; + fc_host_port_id(shost) = 0; + fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; + fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN; + adapter->hydra_version = 0; + + /* avoids adapter shutdown to be able to recognize + * events such as LINK UP */ + atomic_or(ZFCP_STATUS_ADAPTER_XCONFIG_OK, + &adapter->status); + zfcp_fsf_link_down_info_eval(req, + &qtcb->header.fsf_status_qual.link_down_info); + if (zfcp_fsf_exchange_config_evaluate(req)) + return; + break; + default: + zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh3"); + return; + } + + if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) { + adapter->hardware_version = bottom->hardware_version; + memcpy(fc_host_serial_number(shost), bottom->serial_number, + min(FC_SERIAL_NUMBER_SIZE, 17)); + EBCASC(fc_host_serial_number(shost), + min(FC_SERIAL_NUMBER_SIZE, 17)); + } + + if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) { + dev_err(&adapter->ccw_device->dev, + "The FCP adapter only supports newer " + "control block versions\n"); + zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh4"); + return; + } + if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) { + dev_err(&adapter->ccw_device->dev, + "The FCP adapter only supports older " + "control block versions\n"); + zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh5"); + } +} + +static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req) +{ + struct zfcp_adapter *adapter = req->adapter; + struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port; + struct Scsi_Host *shost = adapter->scsi_host; + + if (req->data) + memcpy(req->data, bottom, sizeof(*bottom)); + + if (adapter->connection_features & FSF_FEATURE_NPIV_MODE) { + fc_host_permanent_port_name(shost) = bottom->wwpn; + } else + fc_host_permanent_port_name(shost) = fc_host_port_name(shost); + fc_host_maxframe_size(shost) = bottom->maximum_frame_size; + fc_host_supported_speeds(shost) = + zfcp_fsf_convert_portspeed(bottom->supported_speed); + memcpy(fc_host_supported_fc4s(shost), bottom->supported_fc4_types, + FC_FC4_LIST_SIZE); + memcpy(fc_host_active_fc4s(shost), bottom->active_fc4_types, + FC_FC4_LIST_SIZE); +} + +static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req) +{ + struct fsf_qtcb *qtcb = req->qtcb; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + return; + + switch (qtcb->header.fsf_status) { + case FSF_GOOD: + zfcp_fsf_exchange_port_evaluate(req); + break; + case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE: + zfcp_fsf_exchange_port_evaluate(req); + zfcp_fsf_link_down_info_eval(req, + &qtcb->header.fsf_status_qual.link_down_info); + break; + } +} + +static struct zfcp_fsf_req *zfcp_fsf_alloc(mempool_t *pool) +{ + struct zfcp_fsf_req *req; + + if (likely(pool)) + req = mempool_alloc(pool, GFP_ATOMIC); + else + req = kmalloc(sizeof(*req), GFP_ATOMIC); + + if (unlikely(!req)) + return NULL; + + memset(req, 0, sizeof(*req)); + req->pool = pool; + return req; +} + +static struct fsf_qtcb *zfcp_fsf_qtcb_alloc(mempool_t *pool) +{ + struct fsf_qtcb *qtcb; + + if (likely(pool)) + qtcb = mempool_alloc(pool, GFP_ATOMIC); + else + qtcb = kmem_cache_alloc(zfcp_fsf_qtcb_cache, GFP_ATOMIC); + + if (unlikely(!qtcb)) + return NULL; + + memset(qtcb, 0, sizeof(*qtcb)); + return qtcb; +} + +static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_qdio *qdio, + u32 fsf_cmd, u8 sbtype, + mempool_t *pool) +{ + struct zfcp_adapter *adapter = qdio->adapter; + struct zfcp_fsf_req *req = zfcp_fsf_alloc(pool); + + if (unlikely(!req)) + return ERR_PTR(-ENOMEM); + + if (adapter->req_no == 0) + adapter->req_no++; + + INIT_LIST_HEAD(&req->list); + timer_setup(&req->timer, NULL, 0); + init_completion(&req->completion); + + req->adapter = adapter; + req->fsf_command = fsf_cmd; + req->req_id = adapter->req_no; + + if (likely(fsf_cmd != FSF_QTCB_UNSOLICITED_STATUS)) { + if (likely(pool)) + req->qtcb = zfcp_fsf_qtcb_alloc( + adapter->pool.qtcb_pool); + else + req->qtcb = zfcp_fsf_qtcb_alloc(NULL); + + if (unlikely(!req->qtcb)) { + zfcp_fsf_req_free(req); + return ERR_PTR(-ENOMEM); + } + + req->seq_no = adapter->fsf_req_seq_no; + req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no; + req->qtcb->prefix.req_id = req->req_id; + req->qtcb->prefix.ulp_info = 26; + req->qtcb->prefix.qtcb_type = fsf_qtcb_type[req->fsf_command]; + req->qtcb->prefix.qtcb_version = FSF_QTCB_CURRENT_VERSION; + req->qtcb->header.req_handle = req->req_id; + req->qtcb->header.fsf_command = req->fsf_command; + } + + zfcp_qdio_req_init(adapter->qdio, &req->qdio_req, req->req_id, sbtype, + req->qtcb, sizeof(struct fsf_qtcb)); + + return req; +} + +static int zfcp_fsf_req_send(struct zfcp_fsf_req *req) +{ + struct zfcp_adapter *adapter = req->adapter; + struct zfcp_qdio *qdio = adapter->qdio; + int with_qtcb = (req->qtcb != NULL); + int req_id = req->req_id; + + zfcp_reqlist_add(adapter->req_list, req); + + req->qdio_req.qdio_outb_usage = atomic_read(&qdio->req_q_free); + req->issued = get_tod_clock(); + if (zfcp_qdio_send(qdio, &req->qdio_req)) { + del_timer_sync(&req->timer); + /* lookup request again, list might have changed */ + zfcp_reqlist_find_rm(adapter->req_list, req_id); + zfcp_erp_adapter_reopen(adapter, 0, "fsrs__1"); + return -EIO; + } + + /* Don't increase for unsolicited status */ + if (with_qtcb) + adapter->fsf_req_seq_no++; + adapter->req_no++; + + return 0; +} + +/** + * zfcp_fsf_status_read - send status read request + * @adapter: pointer to struct zfcp_adapter + * @req_flags: request flags + * Returns: 0 on success, ERROR otherwise + */ +int zfcp_fsf_status_read(struct zfcp_qdio *qdio) +{ + struct zfcp_adapter *adapter = qdio->adapter; + struct zfcp_fsf_req *req; + struct fsf_status_read_buffer *sr_buf; + struct page *page; + int retval = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_UNSOLICITED_STATUS, + SBAL_SFLAGS0_TYPE_STATUS, + adapter->pool.status_read_req); + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + page = mempool_alloc(adapter->pool.sr_data, GFP_ATOMIC); + if (!page) { + retval = -ENOMEM; + goto failed_buf; + } + sr_buf = page_address(page); + memset(sr_buf, 0, sizeof(*sr_buf)); + req->data = sr_buf; + + zfcp_qdio_fill_next(qdio, &req->qdio_req, sr_buf, sizeof(*sr_buf)); + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + retval = zfcp_fsf_req_send(req); + if (retval) + goto failed_req_send; + + goto out; + +failed_req_send: + req->data = NULL; + mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data); +failed_buf: + zfcp_dbf_hba_fsf_uss("fssr__1", req); + zfcp_fsf_req_free(req); +out: + spin_unlock_irq(&qdio->req_q_lock); + return retval; +} + +static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req) +{ + struct scsi_device *sdev = req->data; + struct zfcp_scsi_dev *zfcp_sdev; + union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + return; + + zfcp_sdev = sdev_to_zfcp(sdev); + + switch (req->qtcb->header.fsf_status) { + case FSF_PORT_HANDLE_NOT_VALID: + if (fsq->word[0] == fsq->word[1]) { + zfcp_erp_adapter_reopen(zfcp_sdev->port->adapter, 0, + "fsafch1"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + } + break; + case FSF_LUN_HANDLE_NOT_VALID: + if (fsq->word[0] == fsq->word[1]) { + zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fsafch2"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + } + break; + case FSF_FCP_COMMAND_DOES_NOT_EXIST: + req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED; + break; + case FSF_PORT_BOXED: + zfcp_erp_set_port_status(zfcp_sdev->port, + ZFCP_STATUS_COMMON_ACCESS_BOXED); + zfcp_erp_port_reopen(zfcp_sdev->port, + ZFCP_STATUS_COMMON_ERP_FAILED, "fsafch3"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_LUN_BOXED: + zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ACCESS_BOXED); + zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED, + "fsafch4"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_ADAPTER_STATUS_AVAILABLE: + switch (fsq->word[0]) { + case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE: + zfcp_fc_test_link(zfcp_sdev->port); + /* fall through */ + case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } + break; + case FSF_GOOD: + req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED; + break; + } +} + +/** + * zfcp_fsf_abort_fcp_cmnd - abort running SCSI command + * @scmnd: The SCSI command to abort + * Returns: pointer to struct zfcp_fsf_req + */ + +struct zfcp_fsf_req *zfcp_fsf_abort_fcp_cmnd(struct scsi_cmnd *scmnd) +{ + struct zfcp_fsf_req *req = NULL; + struct scsi_device *sdev = scmnd->device; + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + struct zfcp_qdio *qdio = zfcp_sdev->port->adapter->qdio; + unsigned long old_req_id = (unsigned long) scmnd->host_scribble; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + req = zfcp_fsf_req_create(qdio, FSF_QTCB_ABORT_FCP_CMND, + SBAL_SFLAGS0_TYPE_READ, + qdio->adapter->pool.scsi_abort); + if (IS_ERR(req)) { + req = NULL; + goto out; + } + + if (unlikely(!(atomic_read(&zfcp_sdev->status) & + ZFCP_STATUS_COMMON_UNBLOCKED))) + goto out_error_free; + + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->data = sdev; + req->handler = zfcp_fsf_abort_fcp_command_handler; + req->qtcb->header.lun_handle = zfcp_sdev->lun_handle; + req->qtcb->header.port_handle = zfcp_sdev->port->handle; + req->qtcb->bottom.support.req_handle = (u64) old_req_id; + + zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT); + if (!zfcp_fsf_req_send(req)) + goto out; + +out_error_free: + zfcp_fsf_req_free(req); + req = NULL; +out: + spin_unlock_irq(&qdio->req_q_lock); + return req; +} + +static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req) +{ + struct zfcp_adapter *adapter = req->adapter; + struct zfcp_fsf_ct_els *ct = req->data; + struct fsf_qtcb_header *header = &req->qtcb->header; + + ct->status = -EINVAL; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + goto skip_fsfstatus; + + switch (header->fsf_status) { + case FSF_GOOD: + ct->status = 0; + zfcp_dbf_san_res("fsscth2", req); + break; + case FSF_SERVICE_CLASS_NOT_SUPPORTED: + zfcp_fsf_class_not_supp(req); + break; + case FSF_ADAPTER_STATUS_AVAILABLE: + switch (header->fsf_status_qual.word[0]){ + case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE: + case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } + break; + case FSF_PORT_BOXED: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_PORT_HANDLE_NOT_VALID: + zfcp_erp_adapter_reopen(adapter, 0, "fsscth1"); + /* fall through */ + case FSF_GENERIC_COMMAND_REJECTED: + case FSF_PAYLOAD_SIZE_MISMATCH: + case FSF_REQUEST_SIZE_TOO_LARGE: + case FSF_RESPONSE_SIZE_TOO_LARGE: + case FSF_SBAL_MISMATCH: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } + +skip_fsfstatus: + if (ct->handler) + ct->handler(ct->handler_data); +} + +static void zfcp_fsf_setup_ct_els_unchained(struct zfcp_qdio *qdio, + struct zfcp_qdio_req *q_req, + struct scatterlist *sg_req, + struct scatterlist *sg_resp) +{ + zfcp_qdio_fill_next(qdio, q_req, sg_virt(sg_req), sg_req->length); + zfcp_qdio_fill_next(qdio, q_req, sg_virt(sg_resp), sg_resp->length); + zfcp_qdio_set_sbale_last(qdio, q_req); +} + +static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req, + struct scatterlist *sg_req, + struct scatterlist *sg_resp) +{ + struct zfcp_adapter *adapter = req->adapter; + struct zfcp_qdio *qdio = adapter->qdio; + struct fsf_qtcb *qtcb = req->qtcb; + u32 feat = adapter->adapter_features; + + if (zfcp_adapter_multi_buffer_active(adapter)) { + if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_req)) + return -EIO; + qtcb->bottom.support.req_buf_length = + zfcp_qdio_real_bytes(sg_req); + if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_resp)) + return -EIO; + qtcb->bottom.support.resp_buf_length = + zfcp_qdio_real_bytes(sg_resp); + + zfcp_qdio_set_data_div(qdio, &req->qdio_req, sg_nents(sg_req)); + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + zfcp_qdio_set_scount(qdio, &req->qdio_req); + return 0; + } + + /* use single, unchained SBAL if it can hold the request */ + if (zfcp_qdio_sg_one_sbale(sg_req) && zfcp_qdio_sg_one_sbale(sg_resp)) { + zfcp_fsf_setup_ct_els_unchained(qdio, &req->qdio_req, + sg_req, sg_resp); + return 0; + } + + if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) + return -EOPNOTSUPP; + + if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_req)) + return -EIO; + + qtcb->bottom.support.req_buf_length = zfcp_qdio_real_bytes(sg_req); + + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + zfcp_qdio_skip_to_last_sbale(qdio, &req->qdio_req); + + if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_resp)) + return -EIO; + + qtcb->bottom.support.resp_buf_length = zfcp_qdio_real_bytes(sg_resp); + + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + return 0; +} + +static int zfcp_fsf_setup_ct_els(struct zfcp_fsf_req *req, + struct scatterlist *sg_req, + struct scatterlist *sg_resp, + unsigned int timeout) +{ + int ret; + + ret = zfcp_fsf_setup_ct_els_sbals(req, sg_req, sg_resp); + if (ret) + return ret; + + /* common settings for ct/gs and els requests */ + if (timeout > 255) + timeout = 255; /* max value accepted by hardware */ + req->qtcb->bottom.support.service_class = FSF_CLASS_3; + req->qtcb->bottom.support.timeout = timeout; + zfcp_fsf_start_timer(req, (timeout + 10) * HZ); + + return 0; +} + +/** + * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS) + * @ct: pointer to struct zfcp_send_ct with data for request + * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req + */ +int zfcp_fsf_send_ct(struct zfcp_fc_wka_port *wka_port, + struct zfcp_fsf_ct_els *ct, mempool_t *pool, + unsigned int timeout) +{ + struct zfcp_qdio *qdio = wka_port->adapter->qdio; + struct zfcp_fsf_req *req; + int ret = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_SEND_GENERIC, + SBAL_SFLAGS0_TYPE_WRITE_READ, pool); + + if (IS_ERR(req)) { + ret = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + ret = zfcp_fsf_setup_ct_els(req, ct->req, ct->resp, timeout); + if (ret) + goto failed_send; + + req->handler = zfcp_fsf_send_ct_handler; + req->qtcb->header.port_handle = wka_port->handle; + ct->d_id = wka_port->d_id; + req->data = ct; + + zfcp_dbf_san_req("fssct_1", req, wka_port->d_id); + + ret = zfcp_fsf_req_send(req); + if (ret) + goto failed_send; + + goto out; + +failed_send: + zfcp_fsf_req_free(req); +out: + spin_unlock_irq(&qdio->req_q_lock); + return ret; +} + +static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req) +{ + struct zfcp_fsf_ct_els *send_els = req->data; + struct fsf_qtcb_header *header = &req->qtcb->header; + + send_els->status = -EINVAL; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + goto skip_fsfstatus; + + switch (header->fsf_status) { + case FSF_GOOD: + send_els->status = 0; + zfcp_dbf_san_res("fsselh1", req); + break; + case FSF_SERVICE_CLASS_NOT_SUPPORTED: + zfcp_fsf_class_not_supp(req); + break; + case FSF_ADAPTER_STATUS_AVAILABLE: + switch (header->fsf_status_qual.word[0]){ + case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE: + case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED: + case FSF_SQ_RETRY_IF_POSSIBLE: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } + break; + case FSF_ELS_COMMAND_REJECTED: + case FSF_PAYLOAD_SIZE_MISMATCH: + case FSF_REQUEST_SIZE_TOO_LARGE: + case FSF_RESPONSE_SIZE_TOO_LARGE: + break; + case FSF_SBAL_MISMATCH: + /* should never occur, avoided in zfcp_fsf_send_els */ + /* fall through */ + default: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } +skip_fsfstatus: + if (send_els->handler) + send_els->handler(send_els->handler_data); +} + +/** + * zfcp_fsf_send_els - initiate an ELS command (FC-FS) + * @els: pointer to struct zfcp_send_els with data for the command + */ +int zfcp_fsf_send_els(struct zfcp_adapter *adapter, u32 d_id, + struct zfcp_fsf_ct_els *els, unsigned int timeout) +{ + struct zfcp_fsf_req *req; + struct zfcp_qdio *qdio = adapter->qdio; + int ret = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_SEND_ELS, + SBAL_SFLAGS0_TYPE_WRITE_READ, NULL); + + if (IS_ERR(req)) { + ret = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + + if (!zfcp_adapter_multi_buffer_active(adapter)) + zfcp_qdio_sbal_limit(qdio, &req->qdio_req, 2); + + ret = zfcp_fsf_setup_ct_els(req, els->req, els->resp, timeout); + + if (ret) + goto failed_send; + + hton24(req->qtcb->bottom.support.d_id, d_id); + req->handler = zfcp_fsf_send_els_handler; + els->d_id = d_id; + req->data = els; + + zfcp_dbf_san_req("fssels1", req, d_id); + + ret = zfcp_fsf_req_send(req); + if (ret) + goto failed_send; + + goto out; + +failed_send: + zfcp_fsf_req_free(req); +out: + spin_unlock_irq(&qdio->req_q_lock); + return ret; +} + +int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action) +{ + struct zfcp_fsf_req *req; + struct zfcp_qdio *qdio = erp_action->adapter->qdio; + int retval = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_CONFIG_DATA, + SBAL_SFLAGS0_TYPE_READ, + qdio->adapter->pool.erp_req); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->qtcb->bottom.config.feature_selection = + FSF_FEATURE_NOTIFICATION_LOST | + FSF_FEATURE_UPDATE_ALERT; + req->erp_action = erp_action; + req->handler = zfcp_fsf_exchange_config_data_handler; + erp_action->fsf_req_id = req->req_id; + + zfcp_fsf_start_erp_timer(req); + retval = zfcp_fsf_req_send(req); + if (retval) { + zfcp_fsf_req_free(req); + erp_action->fsf_req_id = 0; + } +out: + spin_unlock_irq(&qdio->req_q_lock); + return retval; +} + +int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio, + struct fsf_qtcb_bottom_config *data) +{ + struct zfcp_fsf_req *req = NULL; + int retval = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out_unlock; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_CONFIG_DATA, + SBAL_SFLAGS0_TYPE_READ, NULL); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out_unlock; + } + + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + req->handler = zfcp_fsf_exchange_config_data_handler; + + req->qtcb->bottom.config.feature_selection = + FSF_FEATURE_NOTIFICATION_LOST | + FSF_FEATURE_UPDATE_ALERT; + + if (data) + req->data = data; + + zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT); + retval = zfcp_fsf_req_send(req); + spin_unlock_irq(&qdio->req_q_lock); + if (!retval) + wait_for_completion(&req->completion); + + zfcp_fsf_req_free(req); + return retval; + +out_unlock: + spin_unlock_irq(&qdio->req_q_lock); + return retval; +} + +/** + * zfcp_fsf_exchange_port_data - request information about local port + * @erp_action: ERP action for the adapter for which port data is requested + * Returns: 0 on success, error otherwise + */ +int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action) +{ + struct zfcp_qdio *qdio = erp_action->adapter->qdio; + struct zfcp_fsf_req *req; + int retval = -EIO; + + if (!(qdio->adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) + return -EOPNOTSUPP; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_PORT_DATA, + SBAL_SFLAGS0_TYPE_READ, + qdio->adapter->pool.erp_req); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->handler = zfcp_fsf_exchange_port_data_handler; + req->erp_action = erp_action; + erp_action->fsf_req_id = req->req_id; + + zfcp_fsf_start_erp_timer(req); + retval = zfcp_fsf_req_send(req); + if (retval) { + zfcp_fsf_req_free(req); + erp_action->fsf_req_id = 0; + } +out: + spin_unlock_irq(&qdio->req_q_lock); + return retval; +} + +/** + * zfcp_fsf_exchange_port_data_sync - request information about local port + * @qdio: pointer to struct zfcp_qdio + * @data: pointer to struct fsf_qtcb_bottom_port + * Returns: 0 on success, error otherwise + */ +int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *qdio, + struct fsf_qtcb_bottom_port *data) +{ + struct zfcp_fsf_req *req = NULL; + int retval = -EIO; + + if (!(qdio->adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)) + return -EOPNOTSUPP; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out_unlock; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_PORT_DATA, + SBAL_SFLAGS0_TYPE_READ, NULL); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out_unlock; + } + + if (data) + req->data = data; + + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->handler = zfcp_fsf_exchange_port_data_handler; + zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT); + retval = zfcp_fsf_req_send(req); + spin_unlock_irq(&qdio->req_q_lock); + + if (!retval) + wait_for_completion(&req->completion); + + zfcp_fsf_req_free(req); + + return retval; + +out_unlock: + spin_unlock_irq(&qdio->req_q_lock); + return retval; +} + +static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req) +{ + struct zfcp_port *port = req->data; + struct fsf_qtcb_header *header = &req->qtcb->header; + struct fc_els_flogi *plogi; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + goto out; + + switch (header->fsf_status) { + case FSF_PORT_ALREADY_OPEN: + break; + case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED: + dev_warn(&req->adapter->ccw_device->dev, + "Not enough FCP adapter resources to open " + "remote port 0x%016Lx\n", + (unsigned long long)port->wwpn); + zfcp_erp_set_port_status(port, + ZFCP_STATUS_COMMON_ERP_FAILED); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_ADAPTER_STATUS_AVAILABLE: + switch (header->fsf_status_qual.word[0]) { + case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE: + /* no zfcp_fc_test_link() with failed open port */ + /* fall through */ + case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED: + case FSF_SQ_NO_RETRY_POSSIBLE: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } + break; + case FSF_GOOD: + port->handle = header->port_handle; + atomic_or(ZFCP_STATUS_COMMON_OPEN | + ZFCP_STATUS_PORT_PHYS_OPEN, &port->status); + atomic_andnot(ZFCP_STATUS_COMMON_ACCESS_BOXED, + &port->status); + /* check whether D_ID has changed during open */ + /* + * FIXME: This check is not airtight, as the FCP channel does + * not monitor closures of target port connections caused on + * the remote side. Thus, they might miss out on invalidating + * locally cached WWPNs (and other N_Port parameters) of gone + * target ports. So, our heroic attempt to make things safe + * could be undermined by 'open port' response data tagged with + * obsolete WWPNs. Another reason to monitor potential + * connection closures ourself at least (by interpreting + * incoming ELS' and unsolicited status). It just crosses my + * mind that one should be able to cross-check by means of + * another GID_PN straight after a port has been opened. + * Alternately, an ADISC/PDISC ELS should suffice, as well. + */ + plogi = (struct fc_els_flogi *) req->qtcb->bottom.support.els; + if (req->qtcb->bottom.support.els1_length >= + FSF_PLOGI_MIN_LEN) + zfcp_fc_plogi_evaluate(port, plogi); + break; + case FSF_UNKNOWN_OP_SUBTYPE: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } + +out: + put_device(&port->dev); +} + +/** + * zfcp_fsf_open_port - create and send open port request + * @erp_action: pointer to struct zfcp_erp_action + * Returns: 0 on success, error otherwise + */ +int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action) +{ + struct zfcp_qdio *qdio = erp_action->adapter->qdio; + struct zfcp_port *port = erp_action->port; + struct zfcp_fsf_req *req; + int retval = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_PORT_WITH_DID, + SBAL_SFLAGS0_TYPE_READ, + qdio->adapter->pool.erp_req); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->handler = zfcp_fsf_open_port_handler; + hton24(req->qtcb->bottom.support.d_id, port->d_id); + req->data = port; + req->erp_action = erp_action; + erp_action->fsf_req_id = req->req_id; + get_device(&port->dev); + + zfcp_fsf_start_erp_timer(req); + retval = zfcp_fsf_req_send(req); + if (retval) { + zfcp_fsf_req_free(req); + erp_action->fsf_req_id = 0; + put_device(&port->dev); + } +out: + spin_unlock_irq(&qdio->req_q_lock); + return retval; +} + +static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req) +{ + struct zfcp_port *port = req->data; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + return; + + switch (req->qtcb->header.fsf_status) { + case FSF_PORT_HANDLE_NOT_VALID: + zfcp_erp_adapter_reopen(port->adapter, 0, "fscph_1"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_ADAPTER_STATUS_AVAILABLE: + break; + case FSF_GOOD: + zfcp_erp_clear_port_status(port, ZFCP_STATUS_COMMON_OPEN); + break; + } +} + +/** + * zfcp_fsf_close_port - create and send close port request + * @erp_action: pointer to struct zfcp_erp_action + * Returns: 0 on success, error otherwise + */ +int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action) +{ + struct zfcp_qdio *qdio = erp_action->adapter->qdio; + struct zfcp_fsf_req *req; + int retval = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PORT, + SBAL_SFLAGS0_TYPE_READ, + qdio->adapter->pool.erp_req); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->handler = zfcp_fsf_close_port_handler; + req->data = erp_action->port; + req->erp_action = erp_action; + req->qtcb->header.port_handle = erp_action->port->handle; + erp_action->fsf_req_id = req->req_id; + + zfcp_fsf_start_erp_timer(req); + retval = zfcp_fsf_req_send(req); + if (retval) { + zfcp_fsf_req_free(req); + erp_action->fsf_req_id = 0; + } +out: + spin_unlock_irq(&qdio->req_q_lock); + return retval; +} + +static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req) +{ + struct zfcp_fc_wka_port *wka_port = req->data; + struct fsf_qtcb_header *header = &req->qtcb->header; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) { + wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; + goto out; + } + + switch (header->fsf_status) { + case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED: + dev_warn(&req->adapter->ccw_device->dev, + "Opening WKA port 0x%x failed\n", wka_port->d_id); + /* fall through */ + case FSF_ADAPTER_STATUS_AVAILABLE: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; + break; + case FSF_GOOD: + wka_port->handle = header->port_handle; + /* fall through */ + case FSF_PORT_ALREADY_OPEN: + wka_port->status = ZFCP_FC_WKA_PORT_ONLINE; + } +out: + wake_up(&wka_port->completion_wq); +} + +/** + * zfcp_fsf_open_wka_port - create and send open wka-port request + * @wka_port: pointer to struct zfcp_fc_wka_port + * Returns: 0 on success, error otherwise + */ +int zfcp_fsf_open_wka_port(struct zfcp_fc_wka_port *wka_port) +{ + struct zfcp_qdio *qdio = wka_port->adapter->qdio; + struct zfcp_fsf_req *req; + unsigned long req_id = 0; + int retval = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_PORT_WITH_DID, + SBAL_SFLAGS0_TYPE_READ, + qdio->adapter->pool.erp_req); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->handler = zfcp_fsf_open_wka_port_handler; + hton24(req->qtcb->bottom.support.d_id, wka_port->d_id); + req->data = wka_port; + + req_id = req->req_id; + + zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT); + retval = zfcp_fsf_req_send(req); + if (retval) + zfcp_fsf_req_free(req); +out: + spin_unlock_irq(&qdio->req_q_lock); + if (!retval) + zfcp_dbf_rec_run_wka("fsowp_1", wka_port, req_id); + return retval; +} + +static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req) +{ + struct zfcp_fc_wka_port *wka_port = req->data; + + if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) { + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + zfcp_erp_adapter_reopen(wka_port->adapter, 0, "fscwph1"); + } + + wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE; + wake_up(&wka_port->completion_wq); +} + +/** + * zfcp_fsf_close_wka_port - create and send close wka port request + * @wka_port: WKA port to open + * Returns: 0 on success, error otherwise + */ +int zfcp_fsf_close_wka_port(struct zfcp_fc_wka_port *wka_port) +{ + struct zfcp_qdio *qdio = wka_port->adapter->qdio; + struct zfcp_fsf_req *req; + unsigned long req_id = 0; + int retval = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PORT, + SBAL_SFLAGS0_TYPE_READ, + qdio->adapter->pool.erp_req); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->handler = zfcp_fsf_close_wka_port_handler; + req->data = wka_port; + req->qtcb->header.port_handle = wka_port->handle; + + req_id = req->req_id; + + zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT); + retval = zfcp_fsf_req_send(req); + if (retval) + zfcp_fsf_req_free(req); +out: + spin_unlock_irq(&qdio->req_q_lock); + if (!retval) + zfcp_dbf_rec_run_wka("fscwp_1", wka_port, req_id); + return retval; +} + +static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req) +{ + struct zfcp_port *port = req->data; + struct fsf_qtcb_header *header = &req->qtcb->header; + struct scsi_device *sdev; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + return; + + switch (header->fsf_status) { + case FSF_PORT_HANDLE_NOT_VALID: + zfcp_erp_adapter_reopen(port->adapter, 0, "fscpph1"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_PORT_BOXED: + /* can't use generic zfcp_erp_modify_port_status because + * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */ + atomic_andnot(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status); + shost_for_each_device(sdev, port->adapter->scsi_host) + if (sdev_to_zfcp(sdev)->port == port) + atomic_andnot(ZFCP_STATUS_COMMON_OPEN, + &sdev_to_zfcp(sdev)->status); + zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ACCESS_BOXED); + zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, + "fscpph2"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_ADAPTER_STATUS_AVAILABLE: + switch (header->fsf_status_qual.word[0]) { + case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE: + /* fall through */ + case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } + break; + case FSF_GOOD: + /* can't use generic zfcp_erp_modify_port_status because + * ZFCP_STATUS_COMMON_OPEN must not be reset for the port + */ + atomic_andnot(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status); + shost_for_each_device(sdev, port->adapter->scsi_host) + if (sdev_to_zfcp(sdev)->port == port) + atomic_andnot(ZFCP_STATUS_COMMON_OPEN, + &sdev_to_zfcp(sdev)->status); + break; + } +} + +/** + * zfcp_fsf_close_physical_port - close physical port + * @erp_action: pointer to struct zfcp_erp_action + * Returns: 0 on success + */ +int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action) +{ + struct zfcp_qdio *qdio = erp_action->adapter->qdio; + struct zfcp_fsf_req *req; + int retval = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PHYSICAL_PORT, + SBAL_SFLAGS0_TYPE_READ, + qdio->adapter->pool.erp_req); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->data = erp_action->port; + req->qtcb->header.port_handle = erp_action->port->handle; + req->erp_action = erp_action; + req->handler = zfcp_fsf_close_physical_port_handler; + erp_action->fsf_req_id = req->req_id; + + zfcp_fsf_start_erp_timer(req); + retval = zfcp_fsf_req_send(req); + if (retval) { + zfcp_fsf_req_free(req); + erp_action->fsf_req_id = 0; + } +out: + spin_unlock_irq(&qdio->req_q_lock); + return retval; +} + +static void zfcp_fsf_open_lun_handler(struct zfcp_fsf_req *req) +{ + struct zfcp_adapter *adapter = req->adapter; + struct scsi_device *sdev = req->data; + struct zfcp_scsi_dev *zfcp_sdev; + struct fsf_qtcb_header *header = &req->qtcb->header; + union fsf_status_qual *qual = &header->fsf_status_qual; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + return; + + zfcp_sdev = sdev_to_zfcp(sdev); + + atomic_andnot(ZFCP_STATUS_COMMON_ACCESS_DENIED | + ZFCP_STATUS_COMMON_ACCESS_BOXED, + &zfcp_sdev->status); + + switch (header->fsf_status) { + + case FSF_PORT_HANDLE_NOT_VALID: + zfcp_erp_adapter_reopen(adapter, 0, "fsouh_1"); + /* fall through */ + case FSF_LUN_ALREADY_OPEN: + break; + case FSF_PORT_BOXED: + zfcp_erp_set_port_status(zfcp_sdev->port, + ZFCP_STATUS_COMMON_ACCESS_BOXED); + zfcp_erp_port_reopen(zfcp_sdev->port, + ZFCP_STATUS_COMMON_ERP_FAILED, "fsouh_2"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_LUN_SHARING_VIOLATION: + if (qual->word[0]) + dev_warn(&zfcp_sdev->port->adapter->ccw_device->dev, + "LUN 0x%Lx on port 0x%Lx is already in " + "use by CSS%d, MIF Image ID %x\n", + zfcp_scsi_dev_lun(sdev), + (unsigned long long)zfcp_sdev->port->wwpn, + qual->fsf_queue_designator.cssid, + qual->fsf_queue_designator.hla); + zfcp_erp_set_lun_status(sdev, + ZFCP_STATUS_COMMON_ERP_FAILED | + ZFCP_STATUS_COMMON_ACCESS_DENIED); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED: + dev_warn(&adapter->ccw_device->dev, + "No handle is available for LUN " + "0x%016Lx on port 0x%016Lx\n", + (unsigned long long)zfcp_scsi_dev_lun(sdev), + (unsigned long long)zfcp_sdev->port->wwpn); + zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ERP_FAILED); + /* fall through */ + case FSF_INVALID_COMMAND_OPTION: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_ADAPTER_STATUS_AVAILABLE: + switch (header->fsf_status_qual.word[0]) { + case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE: + zfcp_fc_test_link(zfcp_sdev->port); + /* fall through */ + case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } + break; + + case FSF_GOOD: + zfcp_sdev->lun_handle = header->lun_handle; + atomic_or(ZFCP_STATUS_COMMON_OPEN, &zfcp_sdev->status); + break; + } +} + +/** + * zfcp_fsf_open_lun - open LUN + * @erp_action: pointer to struct zfcp_erp_action + * Returns: 0 on success, error otherwise + */ +int zfcp_fsf_open_lun(struct zfcp_erp_action *erp_action) +{ + struct zfcp_adapter *adapter = erp_action->adapter; + struct zfcp_qdio *qdio = adapter->qdio; + struct zfcp_fsf_req *req; + int retval = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_LUN, + SBAL_SFLAGS0_TYPE_READ, + adapter->pool.erp_req); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->qtcb->header.port_handle = erp_action->port->handle; + req->qtcb->bottom.support.fcp_lun = zfcp_scsi_dev_lun(erp_action->sdev); + req->handler = zfcp_fsf_open_lun_handler; + req->data = erp_action->sdev; + req->erp_action = erp_action; + erp_action->fsf_req_id = req->req_id; + + if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) + req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING; + + zfcp_fsf_start_erp_timer(req); + retval = zfcp_fsf_req_send(req); + if (retval) { + zfcp_fsf_req_free(req); + erp_action->fsf_req_id = 0; + } +out: + spin_unlock_irq(&qdio->req_q_lock); + return retval; +} + +static void zfcp_fsf_close_lun_handler(struct zfcp_fsf_req *req) +{ + struct scsi_device *sdev = req->data; + struct zfcp_scsi_dev *zfcp_sdev; + + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + return; + + zfcp_sdev = sdev_to_zfcp(sdev); + + switch (req->qtcb->header.fsf_status) { + case FSF_PORT_HANDLE_NOT_VALID: + zfcp_erp_adapter_reopen(zfcp_sdev->port->adapter, 0, "fscuh_1"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_LUN_HANDLE_NOT_VALID: + zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fscuh_2"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_PORT_BOXED: + zfcp_erp_set_port_status(zfcp_sdev->port, + ZFCP_STATUS_COMMON_ACCESS_BOXED); + zfcp_erp_port_reopen(zfcp_sdev->port, + ZFCP_STATUS_COMMON_ERP_FAILED, "fscuh_3"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_ADAPTER_STATUS_AVAILABLE: + switch (req->qtcb->header.fsf_status_qual.word[0]) { + case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE: + zfcp_fc_test_link(zfcp_sdev->port); + /* fall through */ + case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED: + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } + break; + case FSF_GOOD: + atomic_andnot(ZFCP_STATUS_COMMON_OPEN, &zfcp_sdev->status); + break; + } +} + +/** + * zfcp_fsf_close_LUN - close LUN + * @erp_action: pointer to erp_action triggering the "close LUN" + * Returns: 0 on success, error otherwise + */ +int zfcp_fsf_close_lun(struct zfcp_erp_action *erp_action) +{ + struct zfcp_qdio *qdio = erp_action->adapter->qdio; + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(erp_action->sdev); + struct zfcp_fsf_req *req; + int retval = -EIO; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_LUN, + SBAL_SFLAGS0_TYPE_READ, + qdio->adapter->pool.erp_req); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + req->qtcb->header.port_handle = erp_action->port->handle; + req->qtcb->header.lun_handle = zfcp_sdev->lun_handle; + req->handler = zfcp_fsf_close_lun_handler; + req->data = erp_action->sdev; + req->erp_action = erp_action; + erp_action->fsf_req_id = req->req_id; + + zfcp_fsf_start_erp_timer(req); + retval = zfcp_fsf_req_send(req); + if (retval) { + zfcp_fsf_req_free(req); + erp_action->fsf_req_id = 0; + } +out: + spin_unlock_irq(&qdio->req_q_lock); + return retval; +} + +static void zfcp_fsf_update_lat(struct fsf_latency_record *lat_rec, u32 lat) +{ + lat_rec->sum += lat; + lat_rec->min = min(lat_rec->min, lat); + lat_rec->max = max(lat_rec->max, lat); +} + +static void zfcp_fsf_req_trace(struct zfcp_fsf_req *req, struct scsi_cmnd *scsi) +{ + struct fsf_qual_latency_info *lat_in; + struct latency_cont *lat = NULL; + struct zfcp_scsi_dev *zfcp_sdev; + struct zfcp_blk_drv_data blktrc; + int ticks = req->adapter->timer_ticks; + + lat_in = &req->qtcb->prefix.prot_status_qual.latency_info; + + blktrc.flags = 0; + blktrc.magic = ZFCP_BLK_DRV_DATA_MAGIC; + if (req->status & ZFCP_STATUS_FSFREQ_ERROR) + blktrc.flags |= ZFCP_BLK_REQ_ERROR; + blktrc.inb_usage = 0; + blktrc.outb_usage = req->qdio_req.qdio_outb_usage; + + if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA && + !(req->status & ZFCP_STATUS_FSFREQ_ERROR)) { + zfcp_sdev = sdev_to_zfcp(scsi->device); + blktrc.flags |= ZFCP_BLK_LAT_VALID; + blktrc.channel_lat = lat_in->channel_lat * ticks; + blktrc.fabric_lat = lat_in->fabric_lat * ticks; + + switch (req->qtcb->bottom.io.data_direction) { + case FSF_DATADIR_DIF_READ_STRIP: + case FSF_DATADIR_DIF_READ_CONVERT: + case FSF_DATADIR_READ: + lat = &zfcp_sdev->latencies.read; + break; + case FSF_DATADIR_DIF_WRITE_INSERT: + case FSF_DATADIR_DIF_WRITE_CONVERT: + case FSF_DATADIR_WRITE: + lat = &zfcp_sdev->latencies.write; + break; + case FSF_DATADIR_CMND: + lat = &zfcp_sdev->latencies.cmd; + break; + } + + if (lat) { + spin_lock(&zfcp_sdev->latencies.lock); + zfcp_fsf_update_lat(&lat->channel, lat_in->channel_lat); + zfcp_fsf_update_lat(&lat->fabric, lat_in->fabric_lat); + lat->counter++; + spin_unlock(&zfcp_sdev->latencies.lock); + } + } + + blk_add_driver_data(scsi->request->q, scsi->request, &blktrc, + sizeof(blktrc)); +} + +/** + * zfcp_fsf_fcp_handler_common() - FCP response handler common to I/O and TMF. + * @req: Pointer to FSF request. + * @sdev: Pointer to SCSI device as request context. + */ +static void zfcp_fsf_fcp_handler_common(struct zfcp_fsf_req *req, + struct scsi_device *sdev) +{ + struct zfcp_scsi_dev *zfcp_sdev; + struct fsf_qtcb_header *header = &req->qtcb->header; + + if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) + return; + + zfcp_sdev = sdev_to_zfcp(sdev); + + switch (header->fsf_status) { + case FSF_HANDLE_MISMATCH: + case FSF_PORT_HANDLE_NOT_VALID: + zfcp_erp_adapter_reopen(req->adapter, 0, "fssfch1"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_FCPLUN_NOT_VALID: + case FSF_LUN_HANDLE_NOT_VALID: + zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fssfch2"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_SERVICE_CLASS_NOT_SUPPORTED: + zfcp_fsf_class_not_supp(req); + break; + case FSF_DIRECTION_INDICATOR_NOT_VALID: + dev_err(&req->adapter->ccw_device->dev, + "Incorrect direction %d, LUN 0x%016Lx on port " + "0x%016Lx closed\n", + req->qtcb->bottom.io.data_direction, + (unsigned long long)zfcp_scsi_dev_lun(sdev), + (unsigned long long)zfcp_sdev->port->wwpn); + zfcp_erp_adapter_shutdown(req->adapter, 0, "fssfch3"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_CMND_LENGTH_NOT_VALID: + dev_err(&req->adapter->ccw_device->dev, + "Incorrect FCP_CMND length %d, FCP device closed\n", + req->qtcb->bottom.io.fcp_cmnd_length); + zfcp_erp_adapter_shutdown(req->adapter, 0, "fssfch4"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_PORT_BOXED: + zfcp_erp_set_port_status(zfcp_sdev->port, + ZFCP_STATUS_COMMON_ACCESS_BOXED); + zfcp_erp_port_reopen(zfcp_sdev->port, + ZFCP_STATUS_COMMON_ERP_FAILED, "fssfch5"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_LUN_BOXED: + zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ACCESS_BOXED); + zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED, + "fssfch6"); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + case FSF_ADAPTER_STATUS_AVAILABLE: + if (header->fsf_status_qual.word[0] == + FSF_SQ_INVOKE_LINK_TEST_PROCEDURE) + zfcp_fc_test_link(zfcp_sdev->port); + req->status |= ZFCP_STATUS_FSFREQ_ERROR; + break; + } +} + +static void zfcp_fsf_fcp_cmnd_handler(struct zfcp_fsf_req *req) +{ + struct scsi_cmnd *scpnt; + struct fcp_resp_with_ext *fcp_rsp; + unsigned long flags; + + read_lock_irqsave(&req->adapter->abort_lock, flags); + + scpnt = req->data; + if (unlikely(!scpnt)) { + read_unlock_irqrestore(&req->adapter->abort_lock, flags); + return; + } + + zfcp_fsf_fcp_handler_common(req, scpnt->device); + + if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) { + set_host_byte(scpnt, DID_TRANSPORT_DISRUPTED); + goto skip_fsfstatus; + } + + switch (req->qtcb->header.fsf_status) { + case FSF_INCONSISTENT_PROT_DATA: + case FSF_INVALID_PROT_PARM: + set_host_byte(scpnt, DID_ERROR); + goto skip_fsfstatus; + case FSF_BLOCK_GUARD_CHECK_FAILURE: + zfcp_scsi_dif_sense_error(scpnt, 0x1); + goto skip_fsfstatus; + case FSF_APP_TAG_CHECK_FAILURE: + zfcp_scsi_dif_sense_error(scpnt, 0x2); + goto skip_fsfstatus; + case FSF_REF_TAG_CHECK_FAILURE: + zfcp_scsi_dif_sense_error(scpnt, 0x3); + goto skip_fsfstatus; + } + BUILD_BUG_ON(sizeof(struct fcp_resp_with_ext) > FSF_FCP_RSP_SIZE); + fcp_rsp = &req->qtcb->bottom.io.fcp_rsp.iu; + zfcp_fc_eval_fcp_rsp(fcp_rsp, scpnt); + +skip_fsfstatus: + zfcp_fsf_req_trace(req, scpnt); + zfcp_dbf_scsi_result(scpnt, req); + + scpnt->host_scribble = NULL; + (scpnt->scsi_done) (scpnt); + /* + * We must hold this lock until scsi_done has been called. + * Otherwise we may call scsi_done after abort regarding this + * command has completed. + * Note: scsi_done must not block! + */ + read_unlock_irqrestore(&req->adapter->abort_lock, flags); +} + +static int zfcp_fsf_set_data_dir(struct scsi_cmnd *scsi_cmnd, u32 *data_dir) +{ + switch (scsi_get_prot_op(scsi_cmnd)) { + case SCSI_PROT_NORMAL: + switch (scsi_cmnd->sc_data_direction) { + case DMA_NONE: + *data_dir = FSF_DATADIR_CMND; + break; + case DMA_FROM_DEVICE: + *data_dir = FSF_DATADIR_READ; + break; + case DMA_TO_DEVICE: + *data_dir = FSF_DATADIR_WRITE; + break; + case DMA_BIDIRECTIONAL: + return -EINVAL; + } + break; + + case SCSI_PROT_READ_STRIP: + *data_dir = FSF_DATADIR_DIF_READ_STRIP; + break; + case SCSI_PROT_WRITE_INSERT: + *data_dir = FSF_DATADIR_DIF_WRITE_INSERT; + break; + case SCSI_PROT_READ_PASS: + *data_dir = FSF_DATADIR_DIF_READ_CONVERT; + break; + case SCSI_PROT_WRITE_PASS: + *data_dir = FSF_DATADIR_DIF_WRITE_CONVERT; + break; + default: + return -EINVAL; + } + + return 0; +} + +/** + * zfcp_fsf_fcp_cmnd - initiate an FCP command (for a SCSI command) + * @scsi_cmnd: scsi command to be sent + */ +int zfcp_fsf_fcp_cmnd(struct scsi_cmnd *scsi_cmnd) +{ + struct zfcp_fsf_req *req; + struct fcp_cmnd *fcp_cmnd; + u8 sbtype = SBAL_SFLAGS0_TYPE_READ; + int retval = -EIO; + struct scsi_device *sdev = scsi_cmnd->device; + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; + struct zfcp_qdio *qdio = adapter->qdio; + struct fsf_qtcb_bottom_io *io; + unsigned long flags; + + if (unlikely(!(atomic_read(&zfcp_sdev->status) & + ZFCP_STATUS_COMMON_UNBLOCKED))) + return -EBUSY; + + spin_lock_irqsave(&qdio->req_q_lock, flags); + if (atomic_read(&qdio->req_q_free) <= 0) { + atomic_inc(&qdio->req_q_full); + goto out; + } + + if (scsi_cmnd->sc_data_direction == DMA_TO_DEVICE) + sbtype = SBAL_SFLAGS0_TYPE_WRITE; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_FCP_CMND, + sbtype, adapter->pool.scsi_req); + + if (IS_ERR(req)) { + retval = PTR_ERR(req); + goto out; + } + + scsi_cmnd->host_scribble = (unsigned char *) req->req_id; + + io = &req->qtcb->bottom.io; + req->status |= ZFCP_STATUS_FSFREQ_CLEANUP; + req->data = scsi_cmnd; + req->handler = zfcp_fsf_fcp_cmnd_handler; + req->qtcb->header.lun_handle = zfcp_sdev->lun_handle; + req->qtcb->header.port_handle = zfcp_sdev->port->handle; + io->service_class = FSF_CLASS_3; + io->fcp_cmnd_length = FCP_CMND_LEN; + + if (scsi_get_prot_op(scsi_cmnd) != SCSI_PROT_NORMAL) { + io->data_block_length = scsi_cmnd->device->sector_size; + io->ref_tag_value = scsi_get_lba(scsi_cmnd) & 0xFFFFFFFF; + } + + if (zfcp_fsf_set_data_dir(scsi_cmnd, &io->data_direction)) + goto failed_scsi_cmnd; + + BUILD_BUG_ON(sizeof(struct fcp_cmnd) > FSF_FCP_CMND_SIZE); + fcp_cmnd = &req->qtcb->bottom.io.fcp_cmnd.iu; + zfcp_fc_scsi_to_fcp(fcp_cmnd, scsi_cmnd); + + if ((scsi_get_prot_op(scsi_cmnd) != SCSI_PROT_NORMAL) && + scsi_prot_sg_count(scsi_cmnd)) { + zfcp_qdio_set_data_div(qdio, &req->qdio_req, + scsi_prot_sg_count(scsi_cmnd)); + retval = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, + scsi_prot_sglist(scsi_cmnd)); + if (retval) + goto failed_scsi_cmnd; + io->prot_data_length = zfcp_qdio_real_bytes( + scsi_prot_sglist(scsi_cmnd)); + } + + retval = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, + scsi_sglist(scsi_cmnd)); + if (unlikely(retval)) + goto failed_scsi_cmnd; + + zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req); + if (zfcp_adapter_multi_buffer_active(adapter)) + zfcp_qdio_set_scount(qdio, &req->qdio_req); + + retval = zfcp_fsf_req_send(req); + if (unlikely(retval)) + goto failed_scsi_cmnd; + + goto out; + +failed_scsi_cmnd: + zfcp_fsf_req_free(req); + scsi_cmnd->host_scribble = NULL; +out: + spin_unlock_irqrestore(&qdio->req_q_lock, flags); + return retval; +} + +static void zfcp_fsf_fcp_task_mgmt_handler(struct zfcp_fsf_req *req) +{ + struct scsi_device *sdev = req->data; + struct fcp_resp_with_ext *fcp_rsp; + struct fcp_resp_rsp_info *rsp_info; + + zfcp_fsf_fcp_handler_common(req, sdev); + + fcp_rsp = &req->qtcb->bottom.io.fcp_rsp.iu; + rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1]; + + if ((rsp_info->rsp_code != FCP_TMF_CMPL) || + (req->status & ZFCP_STATUS_FSFREQ_ERROR)) + req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED; +} + +/** + * zfcp_fsf_fcp_task_mgmt() - Send SCSI task management command (TMF). + * @sdev: Pointer to SCSI device to send the task management command to. + * @tm_flags: Unsigned byte for task management flags. + * + * Return: On success pointer to struct zfcp_fsf_req, %NULL otherwise. + */ +struct zfcp_fsf_req *zfcp_fsf_fcp_task_mgmt(struct scsi_device *sdev, + u8 tm_flags) +{ + struct zfcp_fsf_req *req = NULL; + struct fcp_cmnd *fcp_cmnd; + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + struct zfcp_qdio *qdio = zfcp_sdev->port->adapter->qdio; + + if (unlikely(!(atomic_read(&zfcp_sdev->status) & + ZFCP_STATUS_COMMON_UNBLOCKED))) + return NULL; + + spin_lock_irq(&qdio->req_q_lock); + if (zfcp_qdio_sbal_get(qdio)) + goto out; + + req = zfcp_fsf_req_create(qdio, FSF_QTCB_FCP_CMND, + SBAL_SFLAGS0_TYPE_WRITE, + qdio->adapter->pool.scsi_req); + + if (IS_ERR(req)) { + req = NULL; + goto out; + } + + req->data = sdev; + + req->handler = zfcp_fsf_fcp_task_mgmt_handler; + req->qtcb->header.lun_handle = zfcp_sdev->lun_handle; + req->qtcb->header.port_handle = zfcp_sdev->port->handle; + req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND; + req->qtcb->bottom.io.service_class = FSF_CLASS_3; + req->qtcb->bottom.io.fcp_cmnd_length = FCP_CMND_LEN; + + zfcp_qdio_set_sbale_last(qdio, &req->qdio_req); + + fcp_cmnd = &req->qtcb->bottom.io.fcp_cmnd.iu; + zfcp_fc_fcp_tm(fcp_cmnd, sdev, tm_flags); + + zfcp_fsf_start_timer(req, ZFCP_SCSI_ER_TIMEOUT); + if (!zfcp_fsf_req_send(req)) + goto out; + + zfcp_fsf_req_free(req); + req = NULL; +out: + spin_unlock_irq(&qdio->req_q_lock); + return req; +} + +/** + * zfcp_fsf_reqid_check - validate req_id contained in SBAL returned by QDIO + * @adapter: pointer to struct zfcp_adapter + * @sbal_idx: response queue index of SBAL to be processed + */ +void zfcp_fsf_reqid_check(struct zfcp_qdio *qdio, int sbal_idx) +{ + struct zfcp_adapter *adapter = qdio->adapter; + struct qdio_buffer *sbal = qdio->res_q[sbal_idx]; + struct qdio_buffer_element *sbale; + struct zfcp_fsf_req *fsf_req; + unsigned long req_id; + int idx; + + for (idx = 0; idx < QDIO_MAX_ELEMENTS_PER_BUFFER; idx++) { + + sbale = &sbal->element[idx]; + req_id = (unsigned long) sbale->addr; + fsf_req = zfcp_reqlist_find_rm(adapter->req_list, req_id); + + if (!fsf_req) { + /* + * Unknown request means that we have potentially memory + * corruption and must stop the machine immediately. + */ + zfcp_qdio_siosl(adapter); + panic("error: unknown req_id (%lx) on adapter %s.\n", + req_id, dev_name(&adapter->ccw_device->dev)); + } + + zfcp_fsf_req_complete(fsf_req); + + if (likely(sbale->eflags & SBAL_EFLAGS_LAST_ENTRY)) + break; + } +} diff --git a/drivers/s390/scsi/zfcp_fsf.h b/drivers/s390/scsi/zfcp_fsf.h new file mode 100644 index 000000000..535628b92 --- /dev/null +++ b/drivers/s390/scsi/zfcp_fsf.h @@ -0,0 +1,459 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * zfcp device driver + * + * Interface to the FSF support functions. + * + * Copyright IBM Corp. 2002, 2018 + */ + +#ifndef FSF_H +#define FSF_H + +#include +#include +#include + +#define FSF_QTCB_CURRENT_VERSION 0x00000001 + +/* FSF commands */ +#define FSF_QTCB_FCP_CMND 0x00000001 +#define FSF_QTCB_ABORT_FCP_CMND 0x00000002 +#define FSF_QTCB_OPEN_PORT_WITH_DID 0x00000005 +#define FSF_QTCB_OPEN_LUN 0x00000006 +#define FSF_QTCB_CLOSE_LUN 0x00000007 +#define FSF_QTCB_CLOSE_PORT 0x00000008 +#define FSF_QTCB_CLOSE_PHYSICAL_PORT 0x00000009 +#define FSF_QTCB_SEND_ELS 0x0000000B +#define FSF_QTCB_SEND_GENERIC 0x0000000C +#define FSF_QTCB_EXCHANGE_CONFIG_DATA 0x0000000D +#define FSF_QTCB_EXCHANGE_PORT_DATA 0x0000000E +#define FSF_QTCB_DOWNLOAD_CONTROL_FILE 0x00000012 +#define FSF_QTCB_UPLOAD_CONTROL_FILE 0x00000013 + +/* FSF QTCB types */ +#define FSF_IO_COMMAND 0x00000001 +#define FSF_SUPPORT_COMMAND 0x00000002 +#define FSF_CONFIG_COMMAND 0x00000003 +#define FSF_PORT_COMMAND 0x00000004 + +/* FSF protocol states */ +#define FSF_PROT_GOOD 0x00000001 +#define FSF_PROT_QTCB_VERSION_ERROR 0x00000010 +#define FSF_PROT_SEQ_NUMB_ERROR 0x00000020 +#define FSF_PROT_UNSUPP_QTCB_TYPE 0x00000040 +#define FSF_PROT_HOST_CONNECTION_INITIALIZING 0x00000080 +#define FSF_PROT_FSF_STATUS_PRESENTED 0x00000100 +#define FSF_PROT_DUPLICATE_REQUEST_ID 0x00000200 +#define FSF_PROT_LINK_DOWN 0x00000400 +#define FSF_PROT_REEST_QUEUE 0x00000800 +#define FSF_PROT_ERROR_STATE 0x01000000 + +/* FSF states */ +#define FSF_GOOD 0x00000000 +#define FSF_PORT_ALREADY_OPEN 0x00000001 +#define FSF_LUN_ALREADY_OPEN 0x00000002 +#define FSF_PORT_HANDLE_NOT_VALID 0x00000003 +#define FSF_LUN_HANDLE_NOT_VALID 0x00000004 +#define FSF_HANDLE_MISMATCH 0x00000005 +#define FSF_SERVICE_CLASS_NOT_SUPPORTED 0x00000006 +#define FSF_FCPLUN_NOT_VALID 0x00000009 +#define FSF_LUN_SHARING_VIOLATION 0x00000012 +#define FSF_FCP_COMMAND_DOES_NOT_EXIST 0x00000022 +#define FSF_DIRECTION_INDICATOR_NOT_VALID 0x00000030 +#define FSF_CMND_LENGTH_NOT_VALID 0x00000033 +#define FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED 0x00000040 +#define FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED 0x00000041 +#define FSF_ELS_COMMAND_REJECTED 0x00000050 +#define FSF_GENERIC_COMMAND_REJECTED 0x00000051 +#define FSF_PORT_BOXED 0x00000059 +#define FSF_LUN_BOXED 0x0000005A +#define FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE 0x0000005B +#define FSF_PAYLOAD_SIZE_MISMATCH 0x00000060 +#define FSF_REQUEST_SIZE_TOO_LARGE 0x00000061 +#define FSF_RESPONSE_SIZE_TOO_LARGE 0x00000062 +#define FSF_SBAL_MISMATCH 0x00000063 +#define FSF_INCONSISTENT_PROT_DATA 0x00000070 +#define FSF_INVALID_PROT_PARM 0x00000071 +#define FSF_BLOCK_GUARD_CHECK_FAILURE 0x00000081 +#define FSF_APP_TAG_CHECK_FAILURE 0x00000082 +#define FSF_REF_TAG_CHECK_FAILURE 0x00000083 +#define FSF_ADAPTER_STATUS_AVAILABLE 0x000000AD +#define FSF_FCP_RSP_AVAILABLE 0x000000AF +#define FSF_UNKNOWN_COMMAND 0x000000E2 +#define FSF_UNKNOWN_OP_SUBTYPE 0x000000E3 +#define FSF_INVALID_COMMAND_OPTION 0x000000E5 + +#define FSF_PROT_STATUS_QUAL_SIZE 16 +#define FSF_STATUS_QUALIFIER_SIZE 16 + +/* FSF status qualifier, recommendations */ +#define FSF_SQ_NO_RECOM 0x00 +#define FSF_SQ_FCP_RSP_AVAILABLE 0x01 +#define FSF_SQ_RETRY_IF_POSSIBLE 0x02 +#define FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED 0x03 +#define FSF_SQ_INVOKE_LINK_TEST_PROCEDURE 0x04 +#define FSF_SQ_COMMAND_ABORTED 0x06 +#define FSF_SQ_NO_RETRY_POSSIBLE 0x07 + +/* FSF status qualifier (most significant 4 bytes), local link down */ +#define FSF_PSQ_LINK_NO_LIGHT 0x00000004 +#define FSF_PSQ_LINK_WRAP_PLUG 0x00000008 +#define FSF_PSQ_LINK_NO_FCP 0x00000010 +#define FSF_PSQ_LINK_FIRMWARE_UPDATE 0x00000020 +#define FSF_PSQ_LINK_INVALID_WWPN 0x00000100 +#define FSF_PSQ_LINK_NO_NPIV_SUPPORT 0x00000200 +#define FSF_PSQ_LINK_NO_FCP_RESOURCES 0x00000400 +#define FSF_PSQ_LINK_NO_FABRIC_RESOURCES 0x00000800 +#define FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE 0x00001000 +#define FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED 0x00002000 +#define FSF_PSQ_LINK_MODE_TABLE_CURRUPTED 0x00004000 +#define FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT 0x00008000 + +/* payload size in status read buffer */ +#define FSF_STATUS_READ_PAYLOAD_SIZE 4032 + +/* number of status read buffers that should be sent by ULP */ +#define FSF_STATUS_READS_RECOM 16 + +/* status types in status read buffer */ +#define FSF_STATUS_READ_PORT_CLOSED 0x00000001 +#define FSF_STATUS_READ_INCOMING_ELS 0x00000002 +#define FSF_STATUS_READ_SENSE_DATA_AVAIL 0x00000003 +#define FSF_STATUS_READ_BIT_ERROR_THRESHOLD 0x00000004 +#define FSF_STATUS_READ_LINK_DOWN 0x00000005 +#define FSF_STATUS_READ_LINK_UP 0x00000006 +#define FSF_STATUS_READ_NOTIFICATION_LOST 0x00000009 +#define FSF_STATUS_READ_FEATURE_UPDATE_ALERT 0x0000000C + +/* status subtypes for link down */ +#define FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK 0x00000000 +#define FSF_STATUS_READ_SUB_FDISC_FAILED 0x00000001 +#define FSF_STATUS_READ_SUB_FIRMWARE_UPDATE 0x00000002 + +/* status subtypes for unsolicited status notification lost */ +#define FSF_STATUS_READ_SUB_INCOMING_ELS 0x00000001 + +/* topologie that is detected by the adapter */ +#define FSF_TOPO_P2P 0x00000001 +#define FSF_TOPO_FABRIC 0x00000002 +#define FSF_TOPO_AL 0x00000003 + +/* data direction for FCP commands */ +#define FSF_DATADIR_WRITE 0x00000001 +#define FSF_DATADIR_READ 0x00000002 +#define FSF_DATADIR_CMND 0x00000004 +#define FSF_DATADIR_DIF_WRITE_INSERT 0x00000009 +#define FSF_DATADIR_DIF_READ_STRIP 0x0000000a +#define FSF_DATADIR_DIF_WRITE_CONVERT 0x0000000b +#define FSF_DATADIR_DIF_READ_CONVERT 0X0000000c + +/* data protection control flags */ +#define FSF_APP_TAG_CHECK_ENABLE 0x10 + +/* fc service class */ +#define FSF_CLASS_3 0x00000003 + +/* logging space behind QTCB */ +#define FSF_QTCB_LOG_SIZE 1024 + +/* channel features */ +#define FSF_FEATURE_NOTIFICATION_LOST 0x00000008 +#define FSF_FEATURE_HBAAPI_MANAGEMENT 0x00000010 +#define FSF_FEATURE_ELS_CT_CHAINED_SBALS 0x00000020 +#define FSF_FEATURE_UPDATE_ALERT 0x00000100 +#define FSF_FEATURE_MEASUREMENT_DATA 0x00000200 +#define FSF_FEATURE_DIF_PROT_TYPE1 0x00010000 +#define FSF_FEATURE_DIX_PROT_TCPIP 0x00020000 + +/* host connection features */ +#define FSF_FEATURE_NPIV_MODE 0x00000001 + +/* option */ +#define FSF_OPEN_LUN_SUPPRESS_BOXING 0x00000001 + +struct fsf_queue_designator { + u8 cssid; + u8 chpid; + u8 hla; + u8 ua; + u32 res1; +} __attribute__ ((packed)); + +struct fsf_bit_error_payload { + u32 res1; + u32 link_failure_error_count; + u32 loss_of_sync_error_count; + u32 loss_of_signal_error_count; + u32 primitive_sequence_error_count; + u32 invalid_transmission_word_error_count; + u32 crc_error_count; + u32 primitive_sequence_event_timeout_count; + u32 elastic_buffer_overrun_error_count; + u32 fcal_arbitration_timeout_count; + u32 advertised_receive_b2b_credit; + u32 current_receive_b2b_credit; + u32 advertised_transmit_b2b_credit; + u32 current_transmit_b2b_credit; +} __attribute__ ((packed)); + +struct fsf_link_down_info { + u32 error_code; + u32 res1; + u8 res2[2]; + u8 primary_status; + u8 ioerr_code; + u8 action_code; + u8 reason_code; + u8 explanation_code; + u8 vendor_specific_code; +} __attribute__ ((packed)); + +struct fsf_status_read_buffer { + u32 status_type; + u32 status_subtype; + u32 length; + u32 res1; + struct fsf_queue_designator queue_designator; + u8 res2; + u8 d_id[3]; + u32 class; + u64 fcp_lun; + u8 res3[24]; + union { + u8 data[FSF_STATUS_READ_PAYLOAD_SIZE]; + u32 word[FSF_STATUS_READ_PAYLOAD_SIZE/sizeof(u32)]; + struct fsf_link_down_info link_down_info; + struct fsf_bit_error_payload bit_error; + } payload; +} __attribute__ ((packed)); + +struct fsf_qual_version_error { + u32 fsf_version; + u32 res1[3]; +} __attribute__ ((packed)); + +struct fsf_qual_sequence_error { + u32 exp_req_seq_no; + u32 res1[3]; +} __attribute__ ((packed)); + +struct fsf_qual_latency_info { + u32 channel_lat; + u32 fabric_lat; + u8 res1[8]; +} __attribute__ ((packed)); + +union fsf_prot_status_qual { + u32 word[FSF_PROT_STATUS_QUAL_SIZE / sizeof(u32)]; + u64 doubleword[FSF_PROT_STATUS_QUAL_SIZE / sizeof(u64)]; + struct fsf_qual_version_error version_error; + struct fsf_qual_sequence_error sequence_error; + struct fsf_link_down_info link_down_info; + struct fsf_qual_latency_info latency_info; +} __attribute__ ((packed)); + +struct fsf_qtcb_prefix { + u64 req_id; + u32 qtcb_version; + u32 ulp_info; + u32 qtcb_type; + u32 req_seq_no; + u32 prot_status; + union fsf_prot_status_qual prot_status_qual; + u8 res1[20]; +} __attribute__ ((packed)); + +struct fsf_statistics_info { + u64 input_req; + u64 output_req; + u64 control_req; + u64 input_mb; + u64 output_mb; + u64 seconds_act; +} __attribute__ ((packed)); + +union fsf_status_qual { + u8 byte[FSF_STATUS_QUALIFIER_SIZE]; + u16 halfword[FSF_STATUS_QUALIFIER_SIZE / sizeof (u16)]; + u32 word[FSF_STATUS_QUALIFIER_SIZE / sizeof (u32)]; + u64 doubleword[FSF_STATUS_QUALIFIER_SIZE / sizeof(u64)]; + struct fsf_queue_designator fsf_queue_designator; + struct fsf_link_down_info link_down_info; +} __attribute__ ((packed)); + +struct fsf_qtcb_header { + u64 req_handle; + u32 fsf_command; + u32 res1; + u32 port_handle; + u32 lun_handle; + u32 res2; + u32 fsf_status; + union fsf_status_qual fsf_status_qual; + u8 res3[28]; + u16 log_start; + u16 log_length; + u8 res4[16]; +} __attribute__ ((packed)); + +#define FSF_PLOGI_MIN_LEN 112 + +#define FSF_FCP_CMND_SIZE 288 +#define FSF_FCP_RSP_SIZE 128 + +struct fsf_qtcb_bottom_io { + u32 data_direction; + u32 service_class; + u8 res1; + u8 data_prot_flags; + u16 app_tag_value; + u32 ref_tag_value; + u32 fcp_cmnd_length; + u32 data_block_length; + u32 prot_data_length; + u8 res2[4]; + union { + u8 byte[FSF_FCP_CMND_SIZE]; + struct fcp_cmnd iu; + } fcp_cmnd; + union { + u8 byte[FSF_FCP_RSP_SIZE]; + struct fcp_resp_with_ext iu; + } fcp_rsp; + u8 res3[64]; +} __attribute__ ((packed)); + +struct fsf_qtcb_bottom_support { + u32 operation_subtype; + u8 res1[13]; + u8 d_id[3]; + u32 option; + u64 fcp_lun; + u64 res2; + u64 req_handle; + u32 service_class; + u8 res3[3]; + u8 timeout; + u32 lun_access_info; + u8 res4[180]; + u32 els1_length; + u32 els2_length; + u32 req_buf_length; + u32 resp_buf_length; + u8 els[256]; +} __attribute__ ((packed)); + +#define ZFCP_FSF_TIMER_INT_MASK 0x3FFF + +struct fsf_qtcb_bottom_config { + u32 lic_version; + u32 feature_selection; + u32 high_qtcb_version; + u32 low_qtcb_version; + u32 max_qtcb_size; + u32 max_data_transfer_size; + u32 adapter_features; + u32 connection_features; + u32 fc_topology; + u32 fc_link_speed; /* one of ZFCP_FSF_PORTSPEED_* */ + u32 adapter_type; + u8 res0; + u8 peer_d_id[3]; + u16 status_read_buf_num; + u16 timer_interval; + u8 res2[9]; + u8 s_id[3]; + u8 nport_serv_param[128]; + u8 res3[8]; + u32 adapter_ports; + u32 hardware_version; + u8 serial_number[32]; + u8 plogi_payload[112]; + struct fsf_statistics_info stat_info; + u8 res4[112]; +} __attribute__ ((packed)); + +struct fsf_qtcb_bottom_port { + u64 wwpn; + u32 fc_port_id; + u32 port_type; + u32 port_state; + u32 class_of_service; /* should be 0x00000006 for class 2 and 3 */ + u8 supported_fc4_types[32]; /* should be 0x00000100 for scsi fcp */ + u8 active_fc4_types[32]; + u32 supported_speed; /* any combination of ZFCP_FSF_PORTSPEED_* */ + u32 maximum_frame_size; /* fixed value of 2112 */ + u64 seconds_since_last_reset; + u64 tx_frames; + u64 tx_words; + u64 rx_frames; + u64 rx_words; + u64 lip; /* 0 */ + u64 nos; /* currently 0 */ + u64 error_frames; /* currently 0 */ + u64 dumped_frames; /* currently 0 */ + u64 link_failure; + u64 loss_of_sync; + u64 loss_of_signal; + u64 psp_error_counts; + u64 invalid_tx_words; + u64 invalid_crcs; + u64 input_requests; + u64 output_requests; + u64 control_requests; + u64 input_mb; /* where 1 MByte == 1.000.000 Bytes */ + u64 output_mb; /* where 1 MByte == 1.000.000 Bytes */ + u8 cp_util; + u8 cb_util; + u8 a_util; + u8 res2[253]; +} __attribute__ ((packed)); + +union fsf_qtcb_bottom { + struct fsf_qtcb_bottom_io io; + struct fsf_qtcb_bottom_support support; + struct fsf_qtcb_bottom_config config; + struct fsf_qtcb_bottom_port port; +}; + +struct fsf_qtcb { + struct fsf_qtcb_prefix prefix; + struct fsf_qtcb_header header; + union fsf_qtcb_bottom bottom; + u8 log[FSF_QTCB_LOG_SIZE]; +} __attribute__ ((packed)); + +struct zfcp_blk_drv_data { +#define ZFCP_BLK_DRV_DATA_MAGIC 0x1 + u32 magic; +#define ZFCP_BLK_LAT_VALID 0x1 +#define ZFCP_BLK_REQ_ERROR 0x2 + u16 flags; + u8 inb_usage; + u8 outb_usage; + u64 channel_lat; + u64 fabric_lat; +} __attribute__ ((packed)); + +/** + * struct zfcp_fsf_ct_els - zfcp data for ct or els request + * @req: scatter-gather list for request + * @resp: scatter-gather list for response + * @handler: handler function (called for response to the request) + * @handler_data: data passed to handler function + * @port: Optional pointer to port for zfcp internal ELS (only test link ADISC) + * @status: used to pass error status to calling function + * @d_id: Destination ID of either open WKA port for CT or of D_ID for ELS + */ +struct zfcp_fsf_ct_els { + struct scatterlist *req; + struct scatterlist *resp; + void (*handler)(void *); + void *handler_data; + struct zfcp_port *port; + int status; + u32 d_id; +}; + +#endif /* FSF_H */ diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c new file mode 100644 index 000000000..4ab02e8d3 --- /dev/null +++ b/drivers/s390/scsi/zfcp_qdio.c @@ -0,0 +1,505 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * Setup and helper functions to access QDIO. + * + * Copyright IBM Corp. 2002, 2010 + */ + +#define KMSG_COMPONENT "zfcp" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include "zfcp_ext.h" +#include "zfcp_qdio.h" + +static bool enable_multibuffer = true; +module_param_named(datarouter, enable_multibuffer, bool, 0400); +MODULE_PARM_DESC(datarouter, "Enable hardware data router support (default on)"); + +static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id, + unsigned int qdio_err) +{ + struct zfcp_adapter *adapter = qdio->adapter; + + dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n"); + + if (qdio_err & QDIO_ERROR_SLSB_STATE) { + zfcp_qdio_siosl(adapter); + zfcp_erp_adapter_shutdown(adapter, 0, id); + return; + } + zfcp_erp_adapter_reopen(adapter, + ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED | + ZFCP_STATUS_COMMON_ERP_FAILED, id); +} + +static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt) +{ + int i, sbal_idx; + + for (i = first; i < first + cnt; i++) { + sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q; + memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer)); + } +} + +/* this needs to be called prior to updating the queue fill level */ +static inline void zfcp_qdio_account(struct zfcp_qdio *qdio) +{ + unsigned long long now, span; + int used; + + now = get_tod_clock_monotonic(); + span = (now - qdio->req_q_time) >> 12; + used = QDIO_MAX_BUFFERS_PER_Q - atomic_read(&qdio->req_q_free); + qdio->req_q_util += used * span; + qdio->req_q_time = now; +} + +static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err, + int queue_no, int idx, int count, + unsigned long parm) +{ + struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm; + + if (unlikely(qdio_err)) { + zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err); + return; + } + + /* cleanup all SBALs being program-owned now */ + zfcp_qdio_zero_sbals(qdio->req_q, idx, count); + + spin_lock_irq(&qdio->stat_lock); + zfcp_qdio_account(qdio); + spin_unlock_irq(&qdio->stat_lock); + atomic_add(count, &qdio->req_q_free); + wake_up(&qdio->req_q_wq); +} + +static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err, + int queue_no, int idx, int count, + unsigned long parm) +{ + struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm; + struct zfcp_adapter *adapter = qdio->adapter; + int sbal_no, sbal_idx; + + if (unlikely(qdio_err)) { + if (zfcp_adapter_multi_buffer_active(adapter)) { + void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1]; + struct qdio_buffer_element *sbale; + u64 req_id; + u8 scount; + + memset(pl, 0, + ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *)); + sbale = qdio->res_q[idx]->element; + req_id = (u64) sbale->addr; + scount = min(sbale->scount + 1, + ZFCP_QDIO_MAX_SBALS_PER_REQ + 1); + /* incl. signaling SBAL */ + + for (sbal_no = 0; sbal_no < scount; sbal_no++) { + sbal_idx = (idx + sbal_no) % + QDIO_MAX_BUFFERS_PER_Q; + pl[sbal_no] = qdio->res_q[sbal_idx]; + } + zfcp_dbf_hba_def_err(adapter, req_id, scount, pl); + } + zfcp_qdio_handler_error(qdio, "qdires1", qdio_err); + return; + } + + /* + * go through all SBALs from input queue currently + * returned by QDIO layer + */ + for (sbal_no = 0; sbal_no < count; sbal_no++) { + sbal_idx = (idx + sbal_no) % QDIO_MAX_BUFFERS_PER_Q; + /* go through all SBALEs of SBAL */ + zfcp_fsf_reqid_check(qdio, sbal_idx); + } + + /* + * put SBALs back to response queue + */ + if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, idx, count)) + zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdires2"); +} + +static struct qdio_buffer_element * +zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) +{ + struct qdio_buffer_element *sbale; + + /* set last entry flag in current SBALE of current SBAL */ + sbale = zfcp_qdio_sbale_curr(qdio, q_req); + sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY; + + /* don't exceed last allowed SBAL */ + if (q_req->sbal_last == q_req->sbal_limit) + return NULL; + + /* set chaining flag in first SBALE of current SBAL */ + sbale = zfcp_qdio_sbale_req(qdio, q_req); + sbale->sflags |= SBAL_SFLAGS0_MORE_SBALS; + + /* calculate index of next SBAL */ + q_req->sbal_last++; + q_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q; + + /* keep this requests number of SBALs up-to-date */ + q_req->sbal_number++; + BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ); + + /* start at first SBALE of new SBAL */ + q_req->sbale_curr = 0; + + /* set storage-block type for new SBAL */ + sbale = zfcp_qdio_sbale_curr(qdio, q_req); + sbale->sflags |= q_req->sbtype; + + return sbale; +} + +static struct qdio_buffer_element * +zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) +{ + if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1) + return zfcp_qdio_sbal_chain(qdio, q_req); + q_req->sbale_curr++; + return zfcp_qdio_sbale_curr(qdio, q_req); +} + +/** + * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list + * @qdio: pointer to struct zfcp_qdio + * @q_req: pointer to struct zfcp_qdio_req + * @sg: scatter-gather list + * @max_sbals: upper bound for number of SBALs to be used + * Returns: zero or -EINVAL on error + */ +int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req, + struct scatterlist *sg) +{ + struct qdio_buffer_element *sbale; + + /* set storage-block type for this request */ + sbale = zfcp_qdio_sbale_req(qdio, q_req); + sbale->sflags |= q_req->sbtype; + + for (; sg; sg = sg_next(sg)) { + sbale = zfcp_qdio_sbale_next(qdio, q_req); + if (!sbale) { + atomic_inc(&qdio->req_q_full); + zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first, + q_req->sbal_number); + return -EINVAL; + } + sbale->addr = sg_virt(sg); + sbale->length = sg->length; + } + return 0; +} + +static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio) +{ + if (atomic_read(&qdio->req_q_free) || + !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) + return 1; + return 0; +} + +/** + * zfcp_qdio_sbal_get - get free sbal in request queue, wait if necessary + * @qdio: pointer to struct zfcp_qdio + * + * The req_q_lock must be held by the caller of this function, and + * this function may only be called from process context; it will + * sleep when waiting for a free sbal. + * + * Returns: 0 on success, -EIO if there is no free sbal after waiting. + */ +int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio) +{ + long ret; + + ret = wait_event_interruptible_lock_irq_timeout(qdio->req_q_wq, + zfcp_qdio_sbal_check(qdio), qdio->req_q_lock, 5 * HZ); + + if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) + return -EIO; + + if (ret > 0) + return 0; + + if (!ret) { + atomic_inc(&qdio->req_q_full); + /* assume hanging outbound queue, try queue recovery */ + zfcp_erp_adapter_reopen(qdio->adapter, 0, "qdsbg_1"); + } + + return -EIO; +} + +/** + * zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO + * @qdio: pointer to struct zfcp_qdio + * @q_req: pointer to struct zfcp_qdio_req + * Returns: 0 on success, error otherwise + */ +int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) +{ + int retval; + u8 sbal_number = q_req->sbal_number; + + spin_lock(&qdio->stat_lock); + zfcp_qdio_account(qdio); + spin_unlock(&qdio->stat_lock); + + retval = do_QDIO(qdio->adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0, + q_req->sbal_first, sbal_number); + + if (unlikely(retval)) { + zfcp_qdio_zero_sbals(qdio->req_q, q_req->sbal_first, + sbal_number); + return retval; + } + + /* account for transferred buffers */ + atomic_sub(sbal_number, &qdio->req_q_free); + qdio->req_q_idx += sbal_number; + qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q; + + return 0; +} + + +static void zfcp_qdio_setup_init_data(struct qdio_initialize *id, + struct zfcp_qdio *qdio) +{ + memset(id, 0, sizeof(*id)); + id->cdev = qdio->adapter->ccw_device; + id->q_format = QDIO_ZFCP_QFMT; + memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8); + ASCEBC(id->adapter_name, 8); + id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV; + if (enable_multibuffer) + id->qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE; + id->no_input_qs = 1; + id->no_output_qs = 1; + id->input_handler = zfcp_qdio_int_resp; + id->output_handler = zfcp_qdio_int_req; + id->int_parm = (unsigned long) qdio; + id->input_sbal_addr_array = (void **) (qdio->res_q); + id->output_sbal_addr_array = (void **) (qdio->req_q); + id->scan_threshold = + QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2; +} + +/** + * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data + * @adapter: pointer to struct zfcp_adapter + * Returns: -ENOMEM on memory allocation error or return value from + * qdio_allocate + */ +static int zfcp_qdio_allocate(struct zfcp_qdio *qdio) +{ + struct qdio_initialize init_data; + int ret; + + ret = qdio_alloc_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q); + if (ret) + return -ENOMEM; + + ret = qdio_alloc_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q); + if (ret) + goto free_req_q; + + zfcp_qdio_setup_init_data(&init_data, qdio); + init_waitqueue_head(&qdio->req_q_wq); + + ret = qdio_allocate(&init_data); + if (ret) + goto free_res_q; + + return 0; + +free_res_q: + qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q); +free_req_q: + qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q); + return ret; +} + +/** + * zfcp_close_qdio - close qdio queues for an adapter + * @qdio: pointer to structure zfcp_qdio + */ +void zfcp_qdio_close(struct zfcp_qdio *qdio) +{ + struct zfcp_adapter *adapter = qdio->adapter; + int idx, count; + + if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) + return; + + /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */ + spin_lock_irq(&qdio->req_q_lock); + atomic_andnot(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status); + spin_unlock_irq(&qdio->req_q_lock); + + wake_up(&qdio->req_q_wq); + + qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR); + + /* cleanup used outbound sbals */ + count = atomic_read(&qdio->req_q_free); + if (count < QDIO_MAX_BUFFERS_PER_Q) { + idx = (qdio->req_q_idx + count) % QDIO_MAX_BUFFERS_PER_Q; + count = QDIO_MAX_BUFFERS_PER_Q - count; + zfcp_qdio_zero_sbals(qdio->req_q, idx, count); + } + qdio->req_q_idx = 0; + atomic_set(&qdio->req_q_free, 0); +} + +/** + * zfcp_qdio_open - prepare and initialize response queue + * @qdio: pointer to struct zfcp_qdio + * Returns: 0 on success, otherwise -EIO + */ +int zfcp_qdio_open(struct zfcp_qdio *qdio) +{ + struct qdio_buffer_element *sbale; + struct qdio_initialize init_data; + struct zfcp_adapter *adapter = qdio->adapter; + struct ccw_device *cdev = adapter->ccw_device; + struct qdio_ssqd_desc ssqd; + int cc; + + if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP) + return -EIO; + + atomic_andnot(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED, + &qdio->adapter->status); + + zfcp_qdio_setup_init_data(&init_data, qdio); + + if (qdio_establish(&init_data)) + goto failed_establish; + + if (qdio_get_ssqd_desc(init_data.cdev, &ssqd)) + goto failed_qdio; + + if (ssqd.qdioac2 & CHSC_AC2_DATA_DIV_ENABLED) + atomic_or(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED, + &qdio->adapter->status); + + if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) { + atomic_or(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status); + qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER; + } else { + atomic_andnot(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status); + qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1; + } + + qdio->max_sbale_per_req = + ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal + - 2; + if (qdio_activate(cdev)) + goto failed_qdio; + + for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) { + sbale = &(qdio->res_q[cc]->element[0]); + sbale->length = 0; + sbale->eflags = SBAL_EFLAGS_LAST_ENTRY; + sbale->sflags = 0; + sbale->addr = NULL; + } + + if (do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q)) + goto failed_qdio; + + /* set index of first available SBALS / number of available SBALS */ + qdio->req_q_idx = 0; + atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q); + atomic_or(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status); + + if (adapter->scsi_host) { + adapter->scsi_host->sg_tablesize = qdio->max_sbale_per_req; + adapter->scsi_host->max_sectors = qdio->max_sbale_per_req * 8; + } + + return 0; + +failed_qdio: + qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); +failed_establish: + dev_err(&cdev->dev, + "Setting up the QDIO connection to the FCP adapter failed\n"); + return -EIO; +} + +void zfcp_qdio_destroy(struct zfcp_qdio *qdio) +{ + if (!qdio) + return; + + if (qdio->adapter->ccw_device) + qdio_free(qdio->adapter->ccw_device); + + qdio_free_buffers(qdio->req_q, QDIO_MAX_BUFFERS_PER_Q); + qdio_free_buffers(qdio->res_q, QDIO_MAX_BUFFERS_PER_Q); + kfree(qdio); +} + +int zfcp_qdio_setup(struct zfcp_adapter *adapter) +{ + struct zfcp_qdio *qdio; + + qdio = kzalloc(sizeof(struct zfcp_qdio), GFP_KERNEL); + if (!qdio) + return -ENOMEM; + + qdio->adapter = adapter; + + if (zfcp_qdio_allocate(qdio)) { + kfree(qdio); + return -ENOMEM; + } + + spin_lock_init(&qdio->req_q_lock); + spin_lock_init(&qdio->stat_lock); + + adapter->qdio = qdio; + return 0; +} + +/** + * zfcp_qdio_siosl - Trigger logging in FCP channel + * @adapter: The zfcp_adapter where to trigger logging + * + * Call the cio siosl function to trigger hardware logging. This + * wrapper function sets a flag to ensure hardware logging is only + * triggered once before going through qdio shutdown. + * + * The triggers are always run from qdio tasklet context, so no + * additional synchronization is necessary. + */ +void zfcp_qdio_siosl(struct zfcp_adapter *adapter) +{ + int rc; + + if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_SIOSL_ISSUED) + return; + + rc = ccw_device_siosl(adapter->ccw_device); + if (!rc) + atomic_or(ZFCP_STATUS_ADAPTER_SIOSL_ISSUED, + &adapter->status); +} diff --git a/drivers/s390/scsi/zfcp_qdio.h b/drivers/s390/scsi/zfcp_qdio.h new file mode 100644 index 000000000..886c662cc --- /dev/null +++ b/drivers/s390/scsi/zfcp_qdio.h @@ -0,0 +1,255 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * zfcp device driver + * + * Header file for zfcp qdio interface + * + * Copyright IBM Corp. 2010 + */ + +#ifndef ZFCP_QDIO_H +#define ZFCP_QDIO_H + +#include + +#define ZFCP_QDIO_SBALE_LEN PAGE_SIZE + +/* Max SBALS for chaining */ +#define ZFCP_QDIO_MAX_SBALS_PER_REQ 36 + +/** + * struct zfcp_qdio - basic qdio data structure + * @res_q: response queue + * @req_q: request queue + * @req_q_idx: index of next free buffer + * @req_q_free: number of free buffers in queue + * @stat_lock: lock to protect req_q_util and req_q_time + * @req_q_lock: lock to serialize access to request queue + * @req_q_time: time of last fill level change + * @req_q_util: used for accounting + * @req_q_full: queue full incidents + * @req_q_wq: used to wait for SBAL availability + * @adapter: adapter used in conjunction with this qdio structure + */ +struct zfcp_qdio { + struct qdio_buffer *res_q[QDIO_MAX_BUFFERS_PER_Q]; + struct qdio_buffer *req_q[QDIO_MAX_BUFFERS_PER_Q]; + u8 req_q_idx; + atomic_t req_q_free; + spinlock_t stat_lock; + spinlock_t req_q_lock; + unsigned long long req_q_time; + u64 req_q_util; + atomic_t req_q_full; + wait_queue_head_t req_q_wq; + struct zfcp_adapter *adapter; + u16 max_sbale_per_sbal; + u16 max_sbale_per_req; +}; + +/** + * struct zfcp_qdio_req - qdio queue related values for a request + * @sbtype: sbal type flags for sbale 0 + * @sbal_number: number of free sbals + * @sbal_first: first sbal for this request + * @sbal_last: last sbal for this request + * @sbal_limit: last possible sbal for this request + * @sbale_curr: current sbale at creation of this request + * @qdio_outb_usage: usage of outbound queue + */ +struct zfcp_qdio_req { + u8 sbtype; + u8 sbal_number; + u8 sbal_first; + u8 sbal_last; + u8 sbal_limit; + u8 sbale_curr; + u16 qdio_outb_usage; +}; + +/** + * zfcp_qdio_sbale_req - return pointer to sbale on req_q for a request + * @qdio: pointer to struct zfcp_qdio + * @q_rec: pointer to struct zfcp_qdio_req + * Returns: pointer to qdio_buffer_element (sbale) structure + */ +static inline struct qdio_buffer_element * +zfcp_qdio_sbale_req(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) +{ + return &qdio->req_q[q_req->sbal_last]->element[0]; +} + +/** + * zfcp_qdio_sbale_curr - return current sbale on req_q for a request + * @qdio: pointer to struct zfcp_qdio + * @fsf_req: pointer to struct zfcp_fsf_req + * Returns: pointer to qdio_buffer_element (sbale) structure + */ +static inline struct qdio_buffer_element * +zfcp_qdio_sbale_curr(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) +{ + return &qdio->req_q[q_req->sbal_last]->element[q_req->sbale_curr]; +} + +/** + * zfcp_qdio_req_init - initialize qdio request + * @qdio: request queue where to start putting the request + * @q_req: the qdio request to start + * @req_id: The request id + * @sbtype: type flags to set for all sbals + * @data: First data block + * @len: Length of first data block + * + * This is the start of putting the request into the queue, the last + * step is passing the request to zfcp_qdio_send. The request queue + * lock must be held during the whole process from init to send. + */ +static inline +void zfcp_qdio_req_init(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req, + unsigned long req_id, u8 sbtype, void *data, u32 len) +{ + struct qdio_buffer_element *sbale; + int count = min(atomic_read(&qdio->req_q_free), + ZFCP_QDIO_MAX_SBALS_PER_REQ); + + q_req->sbal_first = q_req->sbal_last = qdio->req_q_idx; + q_req->sbal_number = 1; + q_req->sbtype = sbtype; + q_req->sbale_curr = 1; + q_req->sbal_limit = (q_req->sbal_first + count - 1) + % QDIO_MAX_BUFFERS_PER_Q; + + sbale = zfcp_qdio_sbale_req(qdio, q_req); + sbale->addr = (void *) req_id; + sbale->eflags = 0; + sbale->sflags = SBAL_SFLAGS0_COMMAND | sbtype; + + if (unlikely(!data)) + return; + sbale++; + sbale->addr = data; + sbale->length = len; +} + +/** + * zfcp_qdio_fill_next - Fill next sbale, only for single sbal requests + * @qdio: pointer to struct zfcp_qdio + * @q_req: pointer to struct zfcp_queue_req + * + * This is only required for single sbal requests, calling it when + * wrapping around to the next sbal is a bug. + */ +static inline +void zfcp_qdio_fill_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req, + void *data, u32 len) +{ + struct qdio_buffer_element *sbale; + + BUG_ON(q_req->sbale_curr == qdio->max_sbale_per_sbal - 1); + q_req->sbale_curr++; + sbale = zfcp_qdio_sbale_curr(qdio, q_req); + sbale->addr = data; + sbale->length = len; +} + +/** + * zfcp_qdio_set_sbale_last - set last entry flag in current sbale + * @qdio: pointer to struct zfcp_qdio + * @q_req: pointer to struct zfcp_queue_req + */ +static inline +void zfcp_qdio_set_sbale_last(struct zfcp_qdio *qdio, + struct zfcp_qdio_req *q_req) +{ + struct qdio_buffer_element *sbale; + + sbale = zfcp_qdio_sbale_curr(qdio, q_req); + sbale->eflags |= SBAL_EFLAGS_LAST_ENTRY; +} + +/** + * zfcp_qdio_sg_one_sbal - check if one sbale is enough for sg data + * @sg: The scatterlist where to check the data size + * + * Returns: 1 when one sbale is enough for the data in the scatterlist, + * 0 if not. + */ +static inline +int zfcp_qdio_sg_one_sbale(struct scatterlist *sg) +{ + return sg_is_last(sg) && sg->length <= ZFCP_QDIO_SBALE_LEN; +} + +/** + * zfcp_qdio_skip_to_last_sbale - skip to last sbale in sbal + * @q_req: The current zfcp_qdio_req + */ +static inline +void zfcp_qdio_skip_to_last_sbale(struct zfcp_qdio *qdio, + struct zfcp_qdio_req *q_req) +{ + q_req->sbale_curr = qdio->max_sbale_per_sbal - 1; +} + +/** + * zfcp_qdio_sbal_limit - set the sbal limit for a request in q_req + * @qdio: pointer to struct zfcp_qdio + * @q_req: The current zfcp_qdio_req + * @max_sbals: maximum number of SBALs allowed + */ +static inline +void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio, + struct zfcp_qdio_req *q_req, int max_sbals) +{ + int count = min(atomic_read(&qdio->req_q_free), max_sbals); + + q_req->sbal_limit = (q_req->sbal_first + count - 1) % + QDIO_MAX_BUFFERS_PER_Q; +} + +/** + * zfcp_qdio_set_data_div - set data division count + * @qdio: pointer to struct zfcp_qdio + * @q_req: The current zfcp_qdio_req + * @count: The data division count + */ +static inline +void zfcp_qdio_set_data_div(struct zfcp_qdio *qdio, + struct zfcp_qdio_req *q_req, u32 count) +{ + struct qdio_buffer_element *sbale; + + sbale = qdio->req_q[q_req->sbal_first]->element; + sbale->length = count; +} + +/** + * zfcp_qdio_real_bytes - count bytes used + * @sg: pointer to struct scatterlist + */ +static inline +unsigned int zfcp_qdio_real_bytes(struct scatterlist *sg) +{ + unsigned int real_bytes = 0; + + for (; sg; sg = sg_next(sg)) + real_bytes += sg->length; + + return real_bytes; +} + +/** + * zfcp_qdio_set_scount - set SBAL count value + * @qdio: pointer to struct zfcp_qdio + * @q_req: The current zfcp_qdio_req + */ +static inline +void zfcp_qdio_set_scount(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) +{ + struct qdio_buffer_element *sbale; + + sbale = qdio->req_q[q_req->sbal_first]->element; + sbale->scount = q_req->sbal_number - 1; +} + +#endif /* ZFCP_QDIO_H */ diff --git a/drivers/s390/scsi/zfcp_reqlist.h b/drivers/s390/scsi/zfcp_reqlist.h new file mode 100644 index 000000000..59a943c0d --- /dev/null +++ b/drivers/s390/scsi/zfcp_reqlist.h @@ -0,0 +1,212 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * zfcp device driver + * + * Data structure and helper functions for tracking pending FSF + * requests. + * + * Copyright IBM Corp. 2009, 2016 + */ + +#ifndef ZFCP_REQLIST_H +#define ZFCP_REQLIST_H + +/* number of hash buckets */ +#define ZFCP_REQ_LIST_BUCKETS 128 + +/** + * struct zfcp_reqlist - Container for request list (reqlist) + * @lock: Spinlock for protecting the hash list + * @list: Array of hashbuckets, each is a list of requests in this bucket + */ +struct zfcp_reqlist { + spinlock_t lock; + struct list_head buckets[ZFCP_REQ_LIST_BUCKETS]; +}; + +static inline int zfcp_reqlist_hash(unsigned long req_id) +{ + return req_id % ZFCP_REQ_LIST_BUCKETS; +} + +/** + * zfcp_reqlist_alloc - Allocate and initialize reqlist + * + * Returns pointer to allocated reqlist on success, or NULL on + * allocation failure. + */ +static inline struct zfcp_reqlist *zfcp_reqlist_alloc(void) +{ + unsigned int i; + struct zfcp_reqlist *rl; + + rl = kzalloc(sizeof(struct zfcp_reqlist), GFP_KERNEL); + if (!rl) + return NULL; + + spin_lock_init(&rl->lock); + + for (i = 0; i < ZFCP_REQ_LIST_BUCKETS; i++) + INIT_LIST_HEAD(&rl->buckets[i]); + + return rl; +} + +/** + * zfcp_reqlist_isempty - Check whether the request list empty + * @rl: pointer to reqlist + * + * Returns: 1 if list is empty, 0 if not + */ +static inline int zfcp_reqlist_isempty(struct zfcp_reqlist *rl) +{ + unsigned int i; + + for (i = 0; i < ZFCP_REQ_LIST_BUCKETS; i++) + if (!list_empty(&rl->buckets[i])) + return 0; + return 1; +} + +/** + * zfcp_reqlist_free - Free allocated memory for reqlist + * @rl: The reqlist where to free memory + */ +static inline void zfcp_reqlist_free(struct zfcp_reqlist *rl) +{ + /* sanity check */ + BUG_ON(!zfcp_reqlist_isempty(rl)); + + kfree(rl); +} + +static inline struct zfcp_fsf_req * +_zfcp_reqlist_find(struct zfcp_reqlist *rl, unsigned long req_id) +{ + struct zfcp_fsf_req *req; + unsigned int i; + + i = zfcp_reqlist_hash(req_id); + list_for_each_entry(req, &rl->buckets[i], list) + if (req->req_id == req_id) + return req; + return NULL; +} + +/** + * zfcp_reqlist_find - Lookup FSF request by its request id + * @rl: The reqlist where to lookup the FSF request + * @req_id: The request id to look for + * + * Returns a pointer to the FSF request with the specified request id + * or NULL if there is no known FSF request with this id. + */ +static inline struct zfcp_fsf_req * +zfcp_reqlist_find(struct zfcp_reqlist *rl, unsigned long req_id) +{ + unsigned long flags; + struct zfcp_fsf_req *req; + + spin_lock_irqsave(&rl->lock, flags); + req = _zfcp_reqlist_find(rl, req_id); + spin_unlock_irqrestore(&rl->lock, flags); + + return req; +} + +/** + * zfcp_reqlist_find_rm - Lookup request by id and remove it from reqlist + * @rl: reqlist where to search and remove entry + * @req_id: The request id of the request to look for + * + * This functions tries to find the FSF request with the specified + * id and then removes it from the reqlist. The reqlist lock is held + * during both steps of the operation. + * + * Returns: Pointer to the FSF request if the request has been found, + * NULL if it has not been found. + */ +static inline struct zfcp_fsf_req * +zfcp_reqlist_find_rm(struct zfcp_reqlist *rl, unsigned long req_id) +{ + unsigned long flags; + struct zfcp_fsf_req *req; + + spin_lock_irqsave(&rl->lock, flags); + req = _zfcp_reqlist_find(rl, req_id); + if (req) + list_del(&req->list); + spin_unlock_irqrestore(&rl->lock, flags); + + return req; +} + +/** + * zfcp_reqlist_add - Add entry to reqlist + * @rl: reqlist where to add the entry + * @req: The entry to add + * + * The request id always increases. As an optimization new requests + * are added here with list_add_tail at the end of the bucket lists + * while old requests are looked up starting at the beginning of the + * lists. + */ +static inline void zfcp_reqlist_add(struct zfcp_reqlist *rl, + struct zfcp_fsf_req *req) +{ + unsigned int i; + unsigned long flags; + + i = zfcp_reqlist_hash(req->req_id); + + spin_lock_irqsave(&rl->lock, flags); + list_add_tail(&req->list, &rl->buckets[i]); + spin_unlock_irqrestore(&rl->lock, flags); +} + +/** + * zfcp_reqlist_move - Move all entries from reqlist to simple list + * @rl: The zfcp_reqlist where to remove all entries + * @list: The list where to move all entries + */ +static inline void zfcp_reqlist_move(struct zfcp_reqlist *rl, + struct list_head *list) +{ + unsigned int i; + unsigned long flags; + + spin_lock_irqsave(&rl->lock, flags); + for (i = 0; i < ZFCP_REQ_LIST_BUCKETS; i++) + list_splice_init(&rl->buckets[i], list); + spin_unlock_irqrestore(&rl->lock, flags); +} + +/** + * zfcp_reqlist_apply_for_all() - apply a function to every request. + * @rl: the requestlist that contains the target requests. + * @f: the function to apply to each request; the first parameter of the + * function will be the target-request; the second parameter is the same + * pointer as given with the argument @data. + * @data: freely chosen argument; passed through to @f as second parameter. + * + * Uses :c:macro:`list_for_each_entry` to iterate over the lists in the hash- + * table (not a 'safe' variant, so don't modify the list). + * + * Holds @rl->lock over the entire request-iteration. + */ +static inline void +zfcp_reqlist_apply_for_all(struct zfcp_reqlist *rl, + void (*f)(struct zfcp_fsf_req *, void *), void *data) +{ + struct zfcp_fsf_req *req; + unsigned long flags; + unsigned int i; + + spin_lock_irqsave(&rl->lock, flags); + for (i = 0; i < ZFCP_REQ_LIST_BUCKETS; i++) + list_for_each_entry(req, &rl->buckets[i], list) + f(req, data); + spin_unlock_irqrestore(&rl->lock, flags); +} + +#endif /* ZFCP_REQLIST_H */ diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c new file mode 100644 index 000000000..588bf5ac6 --- /dev/null +++ b/drivers/s390/scsi/zfcp_scsi.c @@ -0,0 +1,868 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * Interface to Linux SCSI midlayer. + * + * Copyright IBM Corp. 2002, 2018 + */ + +#define KMSG_COMPONENT "zfcp" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include "zfcp_ext.h" +#include "zfcp_dbf.h" +#include "zfcp_fc.h" +#include "zfcp_reqlist.h" + +static unsigned int default_depth = 32; +module_param_named(queue_depth, default_depth, uint, 0600); +MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices"); + +static bool enable_dif; +module_param_named(dif, enable_dif, bool, 0400); +MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support"); + +static bool allow_lun_scan = true; +module_param(allow_lun_scan, bool, 0600); +MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs"); + +static void zfcp_scsi_slave_destroy(struct scsi_device *sdev) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + + /* if previous slave_alloc returned early, there is nothing to do */ + if (!zfcp_sdev->port) + return; + + zfcp_erp_lun_shutdown_wait(sdev, "scssd_1"); + put_device(&zfcp_sdev->port->dev); +} + +static int zfcp_scsi_slave_configure(struct scsi_device *sdp) +{ + if (sdp->tagged_supported) + scsi_change_queue_depth(sdp, default_depth); + return 0; +} + +static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) +{ + set_host_byte(scpnt, result); + zfcp_dbf_scsi_fail_send(scpnt); + scpnt->scsi_done(scpnt); +} + +static +int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); + struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device)); + int status, scsi_result, ret; + + /* reset the status for this request */ + scpnt->result = 0; + scpnt->host_scribble = NULL; + + scsi_result = fc_remote_port_chkready(rport); + if (unlikely(scsi_result)) { + scpnt->result = scsi_result; + zfcp_dbf_scsi_fail_send(scpnt); + scpnt->scsi_done(scpnt); + return 0; + } + + status = atomic_read(&zfcp_sdev->status); + if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) && + !(atomic_read(&zfcp_sdev->port->status) & + ZFCP_STATUS_COMMON_ERP_FAILED)) { + /* only LUN access denied, but port is good + * not covered by FC transport, have to fail here */ + zfcp_scsi_command_fail(scpnt, DID_ERROR); + return 0; + } + + if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) { + /* This could be + * call to rport_delete pending: mimic retry from + * fc_remote_port_chkready until rport is BLOCKED + */ + zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY); + return 0; + } + + ret = zfcp_fsf_fcp_cmnd(scpnt); + if (unlikely(ret == -EBUSY)) + return SCSI_MLQUEUE_DEVICE_BUSY; + else if (unlikely(ret < 0)) + return SCSI_MLQUEUE_HOST_BUSY; + + return ret; +} + +static int zfcp_scsi_slave_alloc(struct scsi_device *sdev) +{ + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); + struct zfcp_adapter *adapter = + (struct zfcp_adapter *) sdev->host->hostdata[0]; + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + struct zfcp_port *port; + struct zfcp_unit *unit; + int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE; + + zfcp_sdev->erp_action.adapter = adapter; + zfcp_sdev->erp_action.sdev = sdev; + + port = zfcp_get_port_by_wwpn(adapter, rport->port_name); + if (!port) + return -ENXIO; + + zfcp_sdev->erp_action.port = port; + + mutex_lock(&zfcp_sysfs_port_units_mutex); + if (zfcp_sysfs_port_is_removing(port)) { + /* port is already gone */ + mutex_unlock(&zfcp_sysfs_port_units_mutex); + put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */ + return -ENXIO; + } + mutex_unlock(&zfcp_sysfs_port_units_mutex); + + unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev)); + if (unit) + put_device(&unit->dev); + + if (!unit && !(allow_lun_scan && npiv)) { + put_device(&port->dev); + return -ENXIO; + } + + zfcp_sdev->port = port; + zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF; + zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF; + zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF; + zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF; + zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF; + zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF; + spin_lock_init(&zfcp_sdev->latencies.lock); + + zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING); + zfcp_erp_lun_reopen(sdev, 0, "scsla_1"); + zfcp_erp_wait(port->adapter); + + return 0; +} + +static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) +{ + struct Scsi_Host *scsi_host = scpnt->device->host; + struct zfcp_adapter *adapter = + (struct zfcp_adapter *) scsi_host->hostdata[0]; + struct zfcp_fsf_req *old_req, *abrt_req; + unsigned long flags; + unsigned long old_reqid = (unsigned long) scpnt->host_scribble; + int retval = SUCCESS, ret; + int retry = 3; + char *dbf_tag; + + /* avoid race condition between late normal completion and abort */ + write_lock_irqsave(&adapter->abort_lock, flags); + + old_req = zfcp_reqlist_find(adapter->req_list, old_reqid); + if (!old_req) { + write_unlock_irqrestore(&adapter->abort_lock, flags); + zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL); + return FAILED; /* completion could be in progress */ + } + old_req->data = NULL; + + /* don't access old fsf_req after releasing the abort_lock */ + write_unlock_irqrestore(&adapter->abort_lock, flags); + + while (retry--) { + abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt); + if (abrt_req) + break; + + zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL); + zfcp_erp_wait(adapter); + ret = fc_block_scsi_eh(scpnt); + if (ret) { + zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL); + return ret; + } + if (!(atomic_read(&adapter->status) & + ZFCP_STATUS_COMMON_RUNNING)) { + zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL); + return SUCCESS; + } + } + if (!abrt_req) { + zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL); + return FAILED; + } + + wait_for_completion(&abrt_req->completion); + + if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) + dbf_tag = "abrt_ok"; + else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) + dbf_tag = "abrt_nn"; + else { + dbf_tag = "abrt_fa"; + retval = FAILED; + } + zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req); + zfcp_fsf_req_free(abrt_req); + return retval; +} + +struct zfcp_scsi_req_filter { + u8 tmf_scope; + u32 lun_handle; + u32 port_handle; +}; + +static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data) +{ + struct zfcp_scsi_req_filter *filter = + (struct zfcp_scsi_req_filter *)data; + + /* already aborted - prevent side-effects - or not a SCSI command */ + if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND) + return; + + /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */ + if (old_req->qtcb->header.port_handle != filter->port_handle) + return; + + if (filter->tmf_scope == FCP_TMF_LUN_RESET && + old_req->qtcb->header.lun_handle != filter->lun_handle) + return; + + zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req); + old_req->data = NULL; +} + +static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags) +{ + struct zfcp_adapter *adapter = zsdev->port->adapter; + struct zfcp_scsi_req_filter filter = { + .tmf_scope = FCP_TMF_TGT_RESET, + .port_handle = zsdev->port->handle, + }; + unsigned long flags; + + if (tm_flags == FCP_TMF_LUN_RESET) { + filter.tmf_scope = FCP_TMF_LUN_RESET; + filter.lun_handle = zsdev->lun_handle; + } + + /* + * abort_lock secures against other processings - in the abort-function + * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data + */ + write_lock_irqsave(&adapter->abort_lock, flags); + zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd, + &filter); + write_unlock_irqrestore(&adapter->abort_lock, flags); +} + +/** + * zfcp_scsi_task_mgmt_function() - Send a task management function (sync). + * @sdev: Pointer to SCSI device to send the task management command to. + * @tm_flags: Task management flags, + * here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET. + */ +static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); + struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); + struct zfcp_fsf_req *fsf_req = NULL; + int retval = SUCCESS, ret; + int retry = 3; + + while (retry--) { + fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags); + if (fsf_req) + break; + + zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL); + zfcp_erp_wait(adapter); + ret = fc_block_rport(rport); + if (ret) { + zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL); + return ret; + } + + if (!(atomic_read(&adapter->status) & + ZFCP_STATUS_COMMON_RUNNING)) { + zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL); + return SUCCESS; + } + } + if (!fsf_req) { + zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL); + return FAILED; + } + + wait_for_completion(&fsf_req->completion); + + if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { + zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req); + retval = FAILED; + } else { + zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req); + zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags); + } + + zfcp_fsf_req_free(fsf_req); + return retval; +} + +static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) +{ + struct scsi_device *sdev = scpnt->device; + + return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET); +} + +static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt) +{ + struct scsi_target *starget = scsi_target(scpnt->device); + struct fc_rport *rport = starget_to_rport(starget); + struct Scsi_Host *shost = rport_to_shost(rport); + struct scsi_device *sdev = NULL, *tmp_sdev; + struct zfcp_adapter *adapter = + (struct zfcp_adapter *)shost->hostdata[0]; + int ret; + + shost_for_each_device(tmp_sdev, shost) { + if (tmp_sdev->id == starget->id) { + sdev = tmp_sdev; + break; + } + } + if (!sdev) { + ret = FAILED; + zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret); + return ret; + } + + ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET); + + /* release reference from above shost_for_each_device */ + if (sdev) + scsi_device_put(tmp_sdev); + + return ret; +} + +static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) +{ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); + struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; + int ret = SUCCESS, fc_ret; + + if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) { + zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p"); + zfcp_erp_wait(adapter); + } + zfcp_erp_adapter_reopen(adapter, 0, "schrh_1"); + zfcp_erp_wait(adapter); + fc_ret = fc_block_scsi_eh(scpnt); + if (fc_ret) + ret = fc_ret; + + zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret); + return ret; +} + +/** + * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset. + * @shost: Pointer to Scsi_Host to perform action on. + * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET. + * + * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise. + * + * This is similar to zfcp_sysfs_adapter_failed_store(). + */ +static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type) +{ + struct zfcp_adapter *adapter = + (struct zfcp_adapter *)shost->hostdata[0]; + int ret = 0; + + if (reset_type != SCSI_ADAPTER_RESET) { + ret = -EOPNOTSUPP; + zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret); + return ret; + } + + zfcp_erp_adapter_reset_sync(adapter, "scshr_y"); + return ret; +} + +struct scsi_transport_template *zfcp_scsi_transport_template; + +static struct scsi_host_template zfcp_scsi_host_template = { + .module = THIS_MODULE, + .name = "zfcp", + .queuecommand = zfcp_scsi_queuecommand, + .eh_timed_out = fc_eh_timed_out, + .eh_abort_handler = zfcp_scsi_eh_abort_handler, + .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, + .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler, + .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, + .slave_alloc = zfcp_scsi_slave_alloc, + .slave_configure = zfcp_scsi_slave_configure, + .slave_destroy = zfcp_scsi_slave_destroy, + .change_queue_depth = scsi_change_queue_depth, + .host_reset = zfcp_scsi_sysfs_host_reset, + .proc_name = "zfcp", + .can_queue = 4096, + .this_id = -1, + .sg_tablesize = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) + * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2), + /* GCD, adjusted later */ + .max_sectors = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) + * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8, + /* GCD, adjusted later */ + .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, + .use_clustering = 1, + .shost_attrs = zfcp_sysfs_shost_attrs, + .sdev_attrs = zfcp_sysfs_sdev_attrs, + .track_queue_depth = 1, + .supported_mode = MODE_INITIATOR, +}; + +/** + * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer + * @adapter: The zfcp adapter to register with the SCSI midlayer + */ +int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) +{ + struct ccw_dev_id dev_id; + + if (adapter->scsi_host) + return 0; + + ccw_device_get_id(adapter->ccw_device, &dev_id); + /* register adapter as SCSI host with mid layer of SCSI stack */ + adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template, + sizeof (struct zfcp_adapter *)); + if (!adapter->scsi_host) { + dev_err(&adapter->ccw_device->dev, + "Registering the FCP device with the " + "SCSI stack failed\n"); + return -EIO; + } + + /* tell the SCSI stack some characteristics of this adapter */ + adapter->scsi_host->max_id = 511; + adapter->scsi_host->max_lun = 0xFFFFFFFF; + adapter->scsi_host->max_channel = 0; + adapter->scsi_host->unique_id = dev_id.devno; + adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */ + adapter->scsi_host->transportt = zfcp_scsi_transport_template; + + adapter->scsi_host->hostdata[0] = (unsigned long) adapter; + + if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { + scsi_host_put(adapter->scsi_host); + return -EIO; + } + + return 0; +} + +/** + * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer + * @adapter: The zfcp adapter to unregister. + */ +void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter) +{ + struct Scsi_Host *shost; + struct zfcp_port *port; + + shost = adapter->scsi_host; + if (!shost) + return; + + read_lock_irq(&adapter->port_list_lock); + list_for_each_entry(port, &adapter->port_list, list) + port->rport = NULL; + read_unlock_irq(&adapter->port_list_lock); + + fc_remove_host(shost); + scsi_remove_host(shost); + scsi_host_put(shost); + adapter->scsi_host = NULL; +} + +static struct fc_host_statistics* +zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter) +{ + struct fc_host_statistics *fc_stats; + + if (!adapter->fc_stats) { + fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); + if (!fc_stats) + return NULL; + adapter->fc_stats = fc_stats; /* freed in adapter_release */ + } + memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); + return adapter->fc_stats; +} + +static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, + struct fsf_qtcb_bottom_port *data, + struct fsf_qtcb_bottom_port *old) +{ + fc_stats->seconds_since_last_reset = + data->seconds_since_last_reset - old->seconds_since_last_reset; + fc_stats->tx_frames = data->tx_frames - old->tx_frames; + fc_stats->tx_words = data->tx_words - old->tx_words; + fc_stats->rx_frames = data->rx_frames - old->rx_frames; + fc_stats->rx_words = data->rx_words - old->rx_words; + fc_stats->lip_count = data->lip - old->lip; + fc_stats->nos_count = data->nos - old->nos; + fc_stats->error_frames = data->error_frames - old->error_frames; + fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; + fc_stats->link_failure_count = data->link_failure - old->link_failure; + fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; + fc_stats->loss_of_signal_count = + data->loss_of_signal - old->loss_of_signal; + fc_stats->prim_seq_protocol_err_count = + data->psp_error_counts - old->psp_error_counts; + fc_stats->invalid_tx_word_count = + data->invalid_tx_words - old->invalid_tx_words; + fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; + fc_stats->fcp_input_requests = + data->input_requests - old->input_requests; + fc_stats->fcp_output_requests = + data->output_requests - old->output_requests; + fc_stats->fcp_control_requests = + data->control_requests - old->control_requests; + fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; + fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; +} + +static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats, + struct fsf_qtcb_bottom_port *data) +{ + fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; + fc_stats->tx_frames = data->tx_frames; + fc_stats->tx_words = data->tx_words; + fc_stats->rx_frames = data->rx_frames; + fc_stats->rx_words = data->rx_words; + fc_stats->lip_count = data->lip; + fc_stats->nos_count = data->nos; + fc_stats->error_frames = data->error_frames; + fc_stats->dumped_frames = data->dumped_frames; + fc_stats->link_failure_count = data->link_failure; + fc_stats->loss_of_sync_count = data->loss_of_sync; + fc_stats->loss_of_signal_count = data->loss_of_signal; + fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; + fc_stats->invalid_tx_word_count = data->invalid_tx_words; + fc_stats->invalid_crc_count = data->invalid_crcs; + fc_stats->fcp_input_requests = data->input_requests; + fc_stats->fcp_output_requests = data->output_requests; + fc_stats->fcp_control_requests = data->control_requests; + fc_stats->fcp_input_megabytes = data->input_mb; + fc_stats->fcp_output_megabytes = data->output_mb; +} + +static struct fc_host_statistics * +zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host) +{ + struct zfcp_adapter *adapter; + struct fc_host_statistics *fc_stats; + struct fsf_qtcb_bottom_port *data; + int ret; + + adapter = (struct zfcp_adapter *)host->hostdata[0]; + fc_stats = zfcp_scsi_init_fc_host_stats(adapter); + if (!fc_stats) + return NULL; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return NULL; + + ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); + if (ret) { + kfree(data); + return NULL; + } + + if (adapter->stats_reset && + ((jiffies/HZ - adapter->stats_reset) < + data->seconds_since_last_reset)) + zfcp_scsi_adjust_fc_host_stats(fc_stats, data, + adapter->stats_reset_data); + else + zfcp_scsi_set_fc_host_stats(fc_stats, data); + + kfree(data); + return fc_stats; +} + +static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost) +{ + struct zfcp_adapter *adapter; + struct fsf_qtcb_bottom_port *data; + int ret; + + adapter = (struct zfcp_adapter *)shost->hostdata[0]; + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return; + + ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); + if (ret) + kfree(data); + else { + adapter->stats_reset = jiffies/HZ; + kfree(adapter->stats_reset_data); + adapter->stats_reset_data = data; /* finally freed in + adapter_release */ + } +} + +static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost) +{ + struct zfcp_adapter *adapter = + (struct zfcp_adapter *)shost->hostdata[0]; + int status = atomic_read(&adapter->status); + + if ((status & ZFCP_STATUS_COMMON_RUNNING) && + !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) + fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; + else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) + fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; + else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) + fc_host_port_state(shost) = FC_PORTSTATE_ERROR; + else + fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; +} + +static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport, + u32 timeout) +{ + rport->dev_loss_tmo = timeout; +} + +/** + * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport + * @rport: The FC rport where to teminate I/O + * + * Abort all pending SCSI commands for a port by closing the + * port. Using a reopen avoids a conflict with a shutdown + * overwriting a reopen. The "forced" ensures that a disappeared port + * is not opened again as valid due to the cached plogi data in + * non-NPIV mode. + */ +static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport) +{ + struct zfcp_port *port; + struct Scsi_Host *shost = rport_to_shost(rport); + struct zfcp_adapter *adapter = + (struct zfcp_adapter *)shost->hostdata[0]; + + port = zfcp_get_port_by_wwpn(adapter, rport->port_name); + + if (port) { + zfcp_erp_port_forced_reopen(port, 0, "sctrpi1"); + put_device(&port->dev); + } else { + zfcp_erp_port_forced_no_port_dbf( + "sctrpin", adapter, + rport->port_name /* zfcp_scsi_rport_register */, + rport->port_id /* zfcp_scsi_rport_register */); + } +} + +static void zfcp_scsi_rport_register(struct zfcp_port *port) +{ + struct fc_rport_identifiers ids; + struct fc_rport *rport; + + if (port->rport) + return; + + ids.node_name = port->wwnn; + ids.port_name = port->wwpn; + ids.port_id = port->d_id; + ids.roles = FC_RPORT_ROLE_FCP_TARGET; + + zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL, + ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD, + ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD); + rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids); + if (!rport) { + dev_err(&port->adapter->ccw_device->dev, + "Registering port 0x%016Lx failed\n", + (unsigned long long)port->wwpn); + return; + } + + rport->maxframe_size = port->maxframe_size; + rport->supported_classes = port->supported_classes; + port->rport = rport; + port->starget_id = rport->scsi_target_id; + + zfcp_unit_queue_scsi_scan(port); +} + +static void zfcp_scsi_rport_block(struct zfcp_port *port) +{ + struct fc_rport *rport = port->rport; + + if (rport) { + zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL, + ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL, + ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL); + fc_remote_port_delete(rport); + port->rport = NULL; + } +} + +void zfcp_scsi_schedule_rport_register(struct zfcp_port *port) +{ + get_device(&port->dev); + port->rport_task = RPORT_ADD; + + if (!queue_work(port->adapter->work_queue, &port->rport_work)) + put_device(&port->dev); +} + +void zfcp_scsi_schedule_rport_block(struct zfcp_port *port) +{ + get_device(&port->dev); + port->rport_task = RPORT_DEL; + + if (port->rport && queue_work(port->adapter->work_queue, + &port->rport_work)) + return; + + put_device(&port->dev); +} + +void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter) +{ + unsigned long flags; + struct zfcp_port *port; + + read_lock_irqsave(&adapter->port_list_lock, flags); + list_for_each_entry(port, &adapter->port_list, list) + zfcp_scsi_schedule_rport_block(port); + read_unlock_irqrestore(&adapter->port_list_lock, flags); +} + +void zfcp_scsi_rport_work(struct work_struct *work) +{ + struct zfcp_port *port = container_of(work, struct zfcp_port, + rport_work); + + set_worker_desc("zrp%c-%16llx", + (port->rport_task == RPORT_ADD) ? 'a' : 'd', + port->wwpn); /* < WORKER_DESC_LEN=24 */ + while (port->rport_task) { + if (port->rport_task == RPORT_ADD) { + port->rport_task = RPORT_NONE; + zfcp_scsi_rport_register(port); + } else { + port->rport_task = RPORT_NONE; + zfcp_scsi_rport_block(port); + } + } + + put_device(&port->dev); +} + +/** + * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host + * @adapter: The adapter where to configure DIF/DIX for the SCSI host + */ +void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) +{ + unsigned int mask = 0; + unsigned int data_div; + struct Scsi_Host *shost = adapter->scsi_host; + + data_div = atomic_read(&adapter->status) & + ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; + + if (enable_dif && + adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) + mask |= SHOST_DIF_TYPE1_PROTECTION; + + if (enable_dif && data_div && + adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { + mask |= SHOST_DIX_TYPE1_PROTECTION; + scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); + shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2; + shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2; + shost->max_sectors = shost->sg_tablesize * 8; + } + + scsi_host_set_prot(shost, mask); +} + +/** + * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error + * @scmd: The SCSI command to report the error for + * @ascq: The ASCQ to put in the sense buffer + * + * See the error handling in sd_done for the sense codes used here. + * Set DID_SOFT_ERROR to retry the request, if possible. + */ +void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) +{ + scsi_build_sense_buffer(1, scmd->sense_buffer, + ILLEGAL_REQUEST, 0x10, ascq); + set_driver_byte(scmd, DRIVER_SENSE); + scmd->result |= SAM_STAT_CHECK_CONDITION; + set_host_byte(scmd, DID_SOFT_ERROR); +} + +struct fc_function_template zfcp_transport_functions = { + .show_starget_port_id = 1, + .show_starget_port_name = 1, + .show_starget_node_name = 1, + .show_rport_supported_classes = 1, + .show_rport_maxframe_size = 1, + .show_rport_dev_loss_tmo = 1, + .show_host_node_name = 1, + .show_host_port_name = 1, + .show_host_permanent_port_name = 1, + .show_host_supported_classes = 1, + .show_host_supported_fc4s = 1, + .show_host_supported_speeds = 1, + .show_host_maxframe_size = 1, + .show_host_serial_number = 1, + .get_fc_host_stats = zfcp_scsi_get_fc_host_stats, + .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats, + .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo, + .get_host_port_state = zfcp_scsi_get_host_port_state, + .terminate_rport_io = zfcp_scsi_terminate_rport_io, + .show_host_port_state = 1, + .show_host_active_fc4s = 1, + .bsg_request = zfcp_fc_exec_bsg_job, + .bsg_timeout = zfcp_fc_timeout_bsg_job, + /* no functions registered for following dynamic attributes but + directly set by LLDD */ + .show_host_port_type = 1, + .show_host_symbolic_name = 1, + .show_host_speed = 1, + .show_host_port_id = 1, + .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), +}; diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c new file mode 100644 index 000000000..af197e2b3 --- /dev/null +++ b/drivers/s390/scsi/zfcp_sysfs.c @@ -0,0 +1,666 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * sysfs attributes. + * + * Copyright IBM Corp. 2008, 2010 + */ + +#define KMSG_COMPONENT "zfcp" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include "zfcp_ext.h" + +#define ZFCP_DEV_ATTR(_feat, _name, _mode, _show, _store) \ +struct device_attribute dev_attr_##_feat##_##_name = __ATTR(_name, _mode,\ + _show, _store) +#define ZFCP_DEFINE_ATTR(_feat_def, _feat, _name, _format, _value) \ +static ssize_t zfcp_sysfs_##_feat##_##_name##_show(struct device *dev, \ + struct device_attribute *at,\ + char *buf) \ +{ \ + struct _feat_def *_feat = container_of(dev, struct _feat_def, dev); \ + \ + return sprintf(buf, _format, _value); \ +} \ +static ZFCP_DEV_ATTR(_feat, _name, S_IRUGO, \ + zfcp_sysfs_##_feat##_##_name##_show, NULL); + +#define ZFCP_DEFINE_ATTR_CONST(_feat, _name, _format, _value) \ +static ssize_t zfcp_sysfs_##_feat##_##_name##_show(struct device *dev, \ + struct device_attribute *at,\ + char *buf) \ +{ \ + return sprintf(buf, _format, _value); \ +} \ +static ZFCP_DEV_ATTR(_feat, _name, S_IRUGO, \ + zfcp_sysfs_##_feat##_##_name##_show, NULL); + +#define ZFCP_DEFINE_A_ATTR(_name, _format, _value) \ +static ssize_t zfcp_sysfs_adapter_##_name##_show(struct device *dev, \ + struct device_attribute *at,\ + char *buf) \ +{ \ + struct ccw_device *cdev = to_ccwdev(dev); \ + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); \ + int i; \ + \ + if (!adapter) \ + return -ENODEV; \ + \ + i = sprintf(buf, _format, _value); \ + zfcp_ccw_adapter_put(adapter); \ + return i; \ +} \ +static ZFCP_DEV_ATTR(adapter, _name, S_IRUGO, \ + zfcp_sysfs_adapter_##_name##_show, NULL); + +ZFCP_DEFINE_A_ATTR(status, "0x%08x\n", atomic_read(&adapter->status)); +ZFCP_DEFINE_A_ATTR(peer_wwnn, "0x%016llx\n", + (unsigned long long) adapter->peer_wwnn); +ZFCP_DEFINE_A_ATTR(peer_wwpn, "0x%016llx\n", + (unsigned long long) adapter->peer_wwpn); +ZFCP_DEFINE_A_ATTR(peer_d_id, "0x%06x\n", adapter->peer_d_id); +ZFCP_DEFINE_A_ATTR(card_version, "0x%04x\n", adapter->hydra_version); +ZFCP_DEFINE_A_ATTR(lic_version, "0x%08x\n", adapter->fsf_lic_version); +ZFCP_DEFINE_A_ATTR(hardware_version, "0x%08x\n", adapter->hardware_version); +ZFCP_DEFINE_A_ATTR(in_recovery, "%d\n", (atomic_read(&adapter->status) & + ZFCP_STATUS_COMMON_ERP_INUSE) != 0); + +ZFCP_DEFINE_ATTR(zfcp_port, port, status, "0x%08x\n", + atomic_read(&port->status)); +ZFCP_DEFINE_ATTR(zfcp_port, port, in_recovery, "%d\n", + (atomic_read(&port->status) & + ZFCP_STATUS_COMMON_ERP_INUSE) != 0); +ZFCP_DEFINE_ATTR_CONST(port, access_denied, "%d\n", 0); + +ZFCP_DEFINE_ATTR(zfcp_unit, unit, status, "0x%08x\n", + zfcp_unit_sdev_status(unit)); +ZFCP_DEFINE_ATTR(zfcp_unit, unit, in_recovery, "%d\n", + (zfcp_unit_sdev_status(unit) & + ZFCP_STATUS_COMMON_ERP_INUSE) != 0); +ZFCP_DEFINE_ATTR(zfcp_unit, unit, access_denied, "%d\n", + (zfcp_unit_sdev_status(unit) & + ZFCP_STATUS_COMMON_ACCESS_DENIED) != 0); +ZFCP_DEFINE_ATTR_CONST(unit, access_shared, "%d\n", 0); +ZFCP_DEFINE_ATTR_CONST(unit, access_readonly, "%d\n", 0); + +static ssize_t zfcp_sysfs_port_failed_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct zfcp_port *port = container_of(dev, struct zfcp_port, dev); + + if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) + return sprintf(buf, "1\n"); + + return sprintf(buf, "0\n"); +} + +static ssize_t zfcp_sysfs_port_failed_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct zfcp_port *port = container_of(dev, struct zfcp_port, dev); + unsigned long val; + + if (kstrtoul(buf, 0, &val) || val != 0) + return -EINVAL; + + zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_RUNNING); + zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, "sypfai2"); + zfcp_erp_wait(port->adapter); + + return count; +} +static ZFCP_DEV_ATTR(port, failed, S_IWUSR | S_IRUGO, + zfcp_sysfs_port_failed_show, + zfcp_sysfs_port_failed_store); + +static ssize_t zfcp_sysfs_unit_failed_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev); + struct scsi_device *sdev; + unsigned int status, failed = 1; + + sdev = zfcp_unit_sdev(unit); + if (sdev) { + status = atomic_read(&sdev_to_zfcp(sdev)->status); + failed = status & ZFCP_STATUS_COMMON_ERP_FAILED ? 1 : 0; + scsi_device_put(sdev); + } + + return sprintf(buf, "%d\n", failed); +} + +static ssize_t zfcp_sysfs_unit_failed_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev); + unsigned long val; + struct scsi_device *sdev; + + if (kstrtoul(buf, 0, &val) || val != 0) + return -EINVAL; + + sdev = zfcp_unit_sdev(unit); + if (sdev) { + zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING); + zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED, + "syufai2"); + zfcp_erp_wait(unit->port->adapter); + } else + zfcp_unit_scsi_scan(unit); + + return count; +} +static ZFCP_DEV_ATTR(unit, failed, S_IWUSR | S_IRUGO, + zfcp_sysfs_unit_failed_show, + zfcp_sysfs_unit_failed_store); + +static ssize_t zfcp_sysfs_adapter_failed_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); + int i; + + if (!adapter) + return -ENODEV; + + if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) + i = sprintf(buf, "1\n"); + else + i = sprintf(buf, "0\n"); + + zfcp_ccw_adapter_put(adapter); + return i; +} + +static ssize_t zfcp_sysfs_adapter_failed_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); + unsigned long val; + int retval = 0; + + if (!adapter) + return -ENODEV; + + if (kstrtoul(buf, 0, &val) || val != 0) { + retval = -EINVAL; + goto out; + } + + zfcp_erp_adapter_reset_sync(adapter, "syafai2"); +out: + zfcp_ccw_adapter_put(adapter); + return retval ? retval : (ssize_t) count; +} +static ZFCP_DEV_ATTR(adapter, failed, S_IWUSR | S_IRUGO, + zfcp_sysfs_adapter_failed_show, + zfcp_sysfs_adapter_failed_store); + +static ssize_t zfcp_sysfs_port_rescan_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); + + if (!adapter) + return -ENODEV; + + /* + * Users wish is our command: immediately schedule and flush a + * worker to conduct a synchronous port scan, that is, neither + * a random delay nor a rate limit is applied here. + */ + queue_delayed_work(adapter->work_queue, &adapter->scan_work, 0); + flush_delayed_work(&adapter->scan_work); + zfcp_ccw_adapter_put(adapter); + + return (ssize_t) count; +} +static ZFCP_DEV_ATTR(adapter, port_rescan, S_IWUSR, NULL, + zfcp_sysfs_port_rescan_store); + +DEFINE_MUTEX(zfcp_sysfs_port_units_mutex); + +static void zfcp_sysfs_port_set_removing(struct zfcp_port *const port) +{ + lockdep_assert_held(&zfcp_sysfs_port_units_mutex); + atomic_set(&port->units, -1); +} + +bool zfcp_sysfs_port_is_removing(const struct zfcp_port *const port) +{ + lockdep_assert_held(&zfcp_sysfs_port_units_mutex); + return atomic_read(&port->units) == -1; +} + +static bool zfcp_sysfs_port_in_use(struct zfcp_port *const port) +{ + struct zfcp_adapter *const adapter = port->adapter; + unsigned long flags; + struct scsi_device *sdev; + bool in_use = true; + + mutex_lock(&zfcp_sysfs_port_units_mutex); + if (atomic_read(&port->units) > 0) + goto unlock_port_units_mutex; /* zfcp_unit(s) under port */ + + spin_lock_irqsave(adapter->scsi_host->host_lock, flags); + __shost_for_each_device(sdev, adapter->scsi_host) { + const struct zfcp_scsi_dev *zsdev = sdev_to_zfcp(sdev); + + if (sdev->sdev_state == SDEV_DEL || + sdev->sdev_state == SDEV_CANCEL) + continue; + if (zsdev->port != port) + continue; + /* alive scsi_device under port of interest */ + goto unlock_host_lock; + } + + /* port is about to be removed, so no more unit_add or slave_alloc */ + zfcp_sysfs_port_set_removing(port); + in_use = false; + +unlock_host_lock: + spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags); +unlock_port_units_mutex: + mutex_unlock(&zfcp_sysfs_port_units_mutex); + return in_use; +} + +static ssize_t zfcp_sysfs_port_remove_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct zfcp_adapter *adapter = zfcp_ccw_adapter_by_cdev(cdev); + struct zfcp_port *port; + u64 wwpn; + int retval = -EINVAL; + + if (!adapter) + return -ENODEV; + + if (kstrtoull(buf, 0, (unsigned long long *) &wwpn)) + goto out; + + port = zfcp_get_port_by_wwpn(adapter, wwpn); + if (!port) + goto out; + else + retval = 0; + + if (zfcp_sysfs_port_in_use(port)) { + retval = -EBUSY; + put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */ + goto out; + } + + write_lock_irq(&adapter->port_list_lock); + list_del(&port->list); + write_unlock_irq(&adapter->port_list_lock); + + put_device(&port->dev); + + zfcp_erp_port_shutdown(port, 0, "syprs_1"); + device_unregister(&port->dev); + out: + zfcp_ccw_adapter_put(adapter); + return retval ? retval : (ssize_t) count; +} +static ZFCP_DEV_ATTR(adapter, port_remove, S_IWUSR, NULL, + zfcp_sysfs_port_remove_store); + +static struct attribute *zfcp_adapter_attrs[] = { + &dev_attr_adapter_failed.attr, + &dev_attr_adapter_in_recovery.attr, + &dev_attr_adapter_port_remove.attr, + &dev_attr_adapter_port_rescan.attr, + &dev_attr_adapter_peer_wwnn.attr, + &dev_attr_adapter_peer_wwpn.attr, + &dev_attr_adapter_peer_d_id.attr, + &dev_attr_adapter_card_version.attr, + &dev_attr_adapter_lic_version.attr, + &dev_attr_adapter_status.attr, + &dev_attr_adapter_hardware_version.attr, + NULL +}; + +struct attribute_group zfcp_sysfs_adapter_attrs = { + .attrs = zfcp_adapter_attrs, +}; + +static ssize_t zfcp_sysfs_unit_add_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct zfcp_port *port = container_of(dev, struct zfcp_port, dev); + u64 fcp_lun; + int retval; + + if (kstrtoull(buf, 0, (unsigned long long *) &fcp_lun)) + return -EINVAL; + + retval = zfcp_unit_add(port, fcp_lun); + if (retval) + return retval; + + return count; +} +static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store); + +static ssize_t zfcp_sysfs_unit_remove_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct zfcp_port *port = container_of(dev, struct zfcp_port, dev); + u64 fcp_lun; + + if (kstrtoull(buf, 0, (unsigned long long *) &fcp_lun)) + return -EINVAL; + + if (zfcp_unit_remove(port, fcp_lun)) + return -EINVAL; + + return count; +} +static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store); + +static struct attribute *zfcp_port_attrs[] = { + &dev_attr_unit_add.attr, + &dev_attr_unit_remove.attr, + &dev_attr_port_failed.attr, + &dev_attr_port_in_recovery.attr, + &dev_attr_port_status.attr, + &dev_attr_port_access_denied.attr, + NULL +}; +static struct attribute_group zfcp_port_attr_group = { + .attrs = zfcp_port_attrs, +}; +const struct attribute_group *zfcp_port_attr_groups[] = { + &zfcp_port_attr_group, + NULL, +}; + +static struct attribute *zfcp_unit_attrs[] = { + &dev_attr_unit_failed.attr, + &dev_attr_unit_in_recovery.attr, + &dev_attr_unit_status.attr, + &dev_attr_unit_access_denied.attr, + &dev_attr_unit_access_shared.attr, + &dev_attr_unit_access_readonly.attr, + NULL +}; +static struct attribute_group zfcp_unit_attr_group = { + .attrs = zfcp_unit_attrs, +}; +const struct attribute_group *zfcp_unit_attr_groups[] = { + &zfcp_unit_attr_group, + NULL, +}; + +#define ZFCP_DEFINE_LATENCY_ATTR(_name) \ +static ssize_t \ +zfcp_sysfs_unit_##_name##_latency_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) { \ + struct scsi_device *sdev = to_scsi_device(dev); \ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); \ + struct zfcp_latencies *lat = &zfcp_sdev->latencies; \ + struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; \ + unsigned long long fsum, fmin, fmax, csum, cmin, cmax, cc; \ + \ + spin_lock_bh(&lat->lock); \ + fsum = lat->_name.fabric.sum * adapter->timer_ticks; \ + fmin = lat->_name.fabric.min * adapter->timer_ticks; \ + fmax = lat->_name.fabric.max * adapter->timer_ticks; \ + csum = lat->_name.channel.sum * adapter->timer_ticks; \ + cmin = lat->_name.channel.min * adapter->timer_ticks; \ + cmax = lat->_name.channel.max * adapter->timer_ticks; \ + cc = lat->_name.counter; \ + spin_unlock_bh(&lat->lock); \ + \ + do_div(fsum, 1000); \ + do_div(fmin, 1000); \ + do_div(fmax, 1000); \ + do_div(csum, 1000); \ + do_div(cmin, 1000); \ + do_div(cmax, 1000); \ + \ + return sprintf(buf, "%llu %llu %llu %llu %llu %llu %llu\n", \ + fmin, fmax, fsum, cmin, cmax, csum, cc); \ +} \ +static ssize_t \ +zfcp_sysfs_unit_##_name##_latency_store(struct device *dev, \ + struct device_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + struct scsi_device *sdev = to_scsi_device(dev); \ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); \ + struct zfcp_latencies *lat = &zfcp_sdev->latencies; \ + unsigned long flags; \ + \ + spin_lock_irqsave(&lat->lock, flags); \ + lat->_name.fabric.sum = 0; \ + lat->_name.fabric.min = 0xFFFFFFFF; \ + lat->_name.fabric.max = 0; \ + lat->_name.channel.sum = 0; \ + lat->_name.channel.min = 0xFFFFFFFF; \ + lat->_name.channel.max = 0; \ + lat->_name.counter = 0; \ + spin_unlock_irqrestore(&lat->lock, flags); \ + \ + return (ssize_t) count; \ +} \ +static DEVICE_ATTR(_name##_latency, S_IWUSR | S_IRUGO, \ + zfcp_sysfs_unit_##_name##_latency_show, \ + zfcp_sysfs_unit_##_name##_latency_store); + +ZFCP_DEFINE_LATENCY_ATTR(read); +ZFCP_DEFINE_LATENCY_ATTR(write); +ZFCP_DEFINE_LATENCY_ATTR(cmd); + +#define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ +static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, \ + struct device_attribute *attr,\ + char *buf) \ +{ \ + struct scsi_device *sdev = to_scsi_device(dev); \ + struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); \ + \ + return sprintf(buf, _format, _value); \ +} \ +static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); + +ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", + dev_name(&zfcp_sdev->port->adapter->ccw_device->dev)); +ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", + (unsigned long long) zfcp_sdev->port->wwpn); + +static ssize_t zfcp_sysfs_scsi_fcp_lun_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + + return sprintf(buf, "0x%016llx\n", zfcp_scsi_dev_lun(sdev)); +} +static DEVICE_ATTR(fcp_lun, S_IRUGO, zfcp_sysfs_scsi_fcp_lun_show, NULL); + +ZFCP_DEFINE_SCSI_ATTR(zfcp_access_denied, "%d\n", + (atomic_read(&zfcp_sdev->status) & + ZFCP_STATUS_COMMON_ACCESS_DENIED) != 0); + +static ssize_t zfcp_sysfs_scsi_zfcp_failed_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + unsigned int status = atomic_read(&sdev_to_zfcp(sdev)->status); + unsigned int failed = status & ZFCP_STATUS_COMMON_ERP_FAILED ? 1 : 0; + + return sprintf(buf, "%d\n", failed); +} + +static ssize_t zfcp_sysfs_scsi_zfcp_failed_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct scsi_device *sdev = to_scsi_device(dev); + unsigned long val; + + if (kstrtoul(buf, 0, &val) || val != 0) + return -EINVAL; + + zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING); + zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED, + "syufai3"); + zfcp_erp_wait(sdev_to_zfcp(sdev)->port->adapter); + + return count; +} +static DEVICE_ATTR(zfcp_failed, S_IWUSR | S_IRUGO, + zfcp_sysfs_scsi_zfcp_failed_show, + zfcp_sysfs_scsi_zfcp_failed_store); + +ZFCP_DEFINE_SCSI_ATTR(zfcp_in_recovery, "%d\n", + (atomic_read(&zfcp_sdev->status) & + ZFCP_STATUS_COMMON_ERP_INUSE) != 0); + +ZFCP_DEFINE_SCSI_ATTR(zfcp_status, "0x%08x\n", + atomic_read(&zfcp_sdev->status)); + +struct device_attribute *zfcp_sysfs_sdev_attrs[] = { + &dev_attr_fcp_lun, + &dev_attr_wwpn, + &dev_attr_hba_id, + &dev_attr_read_latency, + &dev_attr_write_latency, + &dev_attr_cmd_latency, + &dev_attr_zfcp_access_denied, + &dev_attr_zfcp_failed, + &dev_attr_zfcp_in_recovery, + &dev_attr_zfcp_status, + NULL +}; + +static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct Scsi_Host *scsi_host = dev_to_shost(dev); + struct fsf_qtcb_bottom_port *qtcb_port; + struct zfcp_adapter *adapter; + int retval; + + adapter = (struct zfcp_adapter *) scsi_host->hostdata[0]; + if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)) + return -EOPNOTSUPP; + + qtcb_port = kzalloc(sizeof(struct fsf_qtcb_bottom_port), GFP_KERNEL); + if (!qtcb_port) + return -ENOMEM; + + retval = zfcp_fsf_exchange_port_data_sync(adapter->qdio, qtcb_port); + if (!retval) + retval = sprintf(buf, "%u %u %u\n", qtcb_port->cp_util, + qtcb_port->cb_util, qtcb_port->a_util); + kfree(qtcb_port); + return retval; +} +static DEVICE_ATTR(utilization, S_IRUGO, zfcp_sysfs_adapter_util_show, NULL); + +static int zfcp_sysfs_adapter_ex_config(struct device *dev, + struct fsf_statistics_info *stat_inf) +{ + struct Scsi_Host *scsi_host = dev_to_shost(dev); + struct fsf_qtcb_bottom_config *qtcb_config; + struct zfcp_adapter *adapter; + int retval; + + adapter = (struct zfcp_adapter *) scsi_host->hostdata[0]; + if (!(adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)) + return -EOPNOTSUPP; + + qtcb_config = kzalloc(sizeof(struct fsf_qtcb_bottom_config), + GFP_KERNEL); + if (!qtcb_config) + return -ENOMEM; + + retval = zfcp_fsf_exchange_config_data_sync(adapter->qdio, qtcb_config); + if (!retval) + *stat_inf = qtcb_config->stat_info; + + kfree(qtcb_config); + return retval; +} + +#define ZFCP_SHOST_ATTR(_name, _format, _arg...) \ +static ssize_t zfcp_sysfs_adapter_##_name##_show(struct device *dev, \ + struct device_attribute *attr,\ + char *buf) \ +{ \ + struct fsf_statistics_info stat_info; \ + int retval; \ + \ + retval = zfcp_sysfs_adapter_ex_config(dev, &stat_info); \ + if (retval) \ + return retval; \ + \ + return sprintf(buf, _format, ## _arg); \ +} \ +static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_adapter_##_name##_show, NULL); + +ZFCP_SHOST_ATTR(requests, "%llu %llu %llu\n", + (unsigned long long) stat_info.input_req, + (unsigned long long) stat_info.output_req, + (unsigned long long) stat_info.control_req); + +ZFCP_SHOST_ATTR(megabytes, "%llu %llu\n", + (unsigned long long) stat_info.input_mb, + (unsigned long long) stat_info.output_mb); + +ZFCP_SHOST_ATTR(seconds_active, "%llu\n", + (unsigned long long) stat_info.seconds_act); + +static ssize_t zfcp_sysfs_adapter_q_full_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct Scsi_Host *scsi_host = class_to_shost(dev); + struct zfcp_qdio *qdio = + ((struct zfcp_adapter *) scsi_host->hostdata[0])->qdio; + u64 util; + + spin_lock_bh(&qdio->stat_lock); + util = qdio->req_q_util; + spin_unlock_bh(&qdio->stat_lock); + + return sprintf(buf, "%d %llu\n", atomic_read(&qdio->req_q_full), + (unsigned long long)util); +} +static DEVICE_ATTR(queue_full, S_IRUGO, zfcp_sysfs_adapter_q_full_show, NULL); + +struct device_attribute *zfcp_sysfs_shost_attrs[] = { + &dev_attr_utilization, + &dev_attr_requests, + &dev_attr_megabytes, + &dev_attr_seconds_active, + &dev_attr_queue_full, + NULL +}; diff --git a/drivers/s390/scsi/zfcp_unit.c b/drivers/s390/scsi/zfcp_unit.c new file mode 100644 index 000000000..e67bf7388 --- /dev/null +++ b/drivers/s390/scsi/zfcp_unit.c @@ -0,0 +1,263 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * Tracking of manually configured LUNs and helper functions to + * register the LUNs with the SCSI midlayer. + * + * Copyright IBM Corp. 2010 + */ + +#include "zfcp_def.h" +#include "zfcp_ext.h" + +/** + * zfcp_unit_scsi_scan - Register LUN with SCSI midlayer + * @unit: The zfcp LUN/unit to register + * + * When the SCSI midlayer is not allowed to automatically scan and + * attach SCSI devices, zfcp has to register the single devices with + * the SCSI midlayer. + */ +void zfcp_unit_scsi_scan(struct zfcp_unit *unit) +{ + struct fc_rport *rport = unit->port->rport; + u64 lun; + + lun = scsilun_to_int((struct scsi_lun *) &unit->fcp_lun); + + if (rport && rport->port_state == FC_PORTSTATE_ONLINE) + scsi_scan_target(&rport->dev, 0, rport->scsi_target_id, lun, + SCSI_SCAN_MANUAL); +} + +static void zfcp_unit_scsi_scan_work(struct work_struct *work) +{ + struct zfcp_unit *unit = container_of(work, struct zfcp_unit, + scsi_work); + + zfcp_unit_scsi_scan(unit); + put_device(&unit->dev); +} + +/** + * zfcp_unit_queue_scsi_scan - Register configured units on port + * @port: The zfcp_port where to register units + * + * After opening a port, all units configured on this port have to be + * registered with the SCSI midlayer. This function should be called + * after calling fc_remote_port_add, so that the fc_rport is already + * ONLINE and the call to scsi_scan_target runs the same way as the + * call in the FC transport class. + */ +void zfcp_unit_queue_scsi_scan(struct zfcp_port *port) +{ + struct zfcp_unit *unit; + + read_lock_irq(&port->unit_list_lock); + list_for_each_entry(unit, &port->unit_list, list) { + get_device(&unit->dev); + if (scsi_queue_work(port->adapter->scsi_host, + &unit->scsi_work) <= 0) + put_device(&unit->dev); + } + read_unlock_irq(&port->unit_list_lock); +} + +static struct zfcp_unit *_zfcp_unit_find(struct zfcp_port *port, u64 fcp_lun) +{ + struct zfcp_unit *unit; + + list_for_each_entry(unit, &port->unit_list, list) + if (unit->fcp_lun == fcp_lun) { + get_device(&unit->dev); + return unit; + } + + return NULL; +} + +/** + * zfcp_unit_find - Find and return zfcp_unit with specified FCP LUN + * @port: zfcp_port where to look for the unit + * @fcp_lun: 64 Bit FCP LUN used to identify the zfcp_unit + * + * If zfcp_unit is found, a reference is acquired that has to be + * released later. + * + * Returns: Pointer to the zfcp_unit, or NULL if there is no zfcp_unit + * with the specified FCP LUN. + */ +struct zfcp_unit *zfcp_unit_find(struct zfcp_port *port, u64 fcp_lun) +{ + struct zfcp_unit *unit; + + read_lock_irq(&port->unit_list_lock); + unit = _zfcp_unit_find(port, fcp_lun); + read_unlock_irq(&port->unit_list_lock); + return unit; +} + +/** + * zfcp_unit_release - Drop reference to zfcp_port and free memory of zfcp_unit. + * @dev: pointer to device in zfcp_unit + */ +static void zfcp_unit_release(struct device *dev) +{ + struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev); + + atomic_dec(&unit->port->units); + kfree(unit); +} + +/** + * zfcp_unit_enqueue - enqueue unit to unit list of a port. + * @port: pointer to port where unit is added + * @fcp_lun: FCP LUN of unit to be enqueued + * Returns: 0 success + * + * Sets up some unit internal structures and creates sysfs entry. + */ +int zfcp_unit_add(struct zfcp_port *port, u64 fcp_lun) +{ + struct zfcp_unit *unit; + int retval = 0; + + mutex_lock(&zfcp_sysfs_port_units_mutex); + if (zfcp_sysfs_port_is_removing(port)) { + /* port is already gone */ + retval = -ENODEV; + goto out; + } + + unit = zfcp_unit_find(port, fcp_lun); + if (unit) { + put_device(&unit->dev); + retval = -EEXIST; + goto out; + } + + unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL); + if (!unit) { + retval = -ENOMEM; + goto out; + } + + unit->port = port; + unit->fcp_lun = fcp_lun; + unit->dev.parent = &port->dev; + unit->dev.release = zfcp_unit_release; + unit->dev.groups = zfcp_unit_attr_groups; + INIT_WORK(&unit->scsi_work, zfcp_unit_scsi_scan_work); + + if (dev_set_name(&unit->dev, "0x%016llx", + (unsigned long long) fcp_lun)) { + kfree(unit); + retval = -ENOMEM; + goto out; + } + + if (device_register(&unit->dev)) { + put_device(&unit->dev); + retval = -ENOMEM; + goto out; + } + + atomic_inc(&port->units); /* under zfcp_sysfs_port_units_mutex ! */ + + write_lock_irq(&port->unit_list_lock); + list_add_tail(&unit->list, &port->unit_list); + write_unlock_irq(&port->unit_list_lock); + /* + * lock order: shost->scan_mutex before zfcp_sysfs_port_units_mutex + * due to zfcp_unit_scsi_scan() => zfcp_scsi_slave_alloc() + */ + mutex_unlock(&zfcp_sysfs_port_units_mutex); + + zfcp_unit_scsi_scan(unit); + return retval; + +out: + mutex_unlock(&zfcp_sysfs_port_units_mutex); + return retval; +} + +/** + * zfcp_unit_sdev - Return SCSI device for zfcp_unit + * @unit: The zfcp_unit where to get the SCSI device for + * + * Returns: scsi_device pointer on success, NULL if there is no SCSI + * device for this zfcp_unit + * + * On success, the caller also holds a reference to the SCSI device + * that must be released with scsi_device_put. + */ +struct scsi_device *zfcp_unit_sdev(struct zfcp_unit *unit) +{ + struct Scsi_Host *shost; + struct zfcp_port *port; + u64 lun; + + lun = scsilun_to_int((struct scsi_lun *) &unit->fcp_lun); + port = unit->port; + shost = port->adapter->scsi_host; + return scsi_device_lookup(shost, 0, port->starget_id, lun); +} + +/** + * zfcp_unit_sdev_status - Return zfcp LUN status for SCSI device + * @unit: The unit to lookup the SCSI device for + * + * Returns the zfcp LUN status field of the SCSI device if the SCSI device + * for the zfcp_unit exists, 0 otherwise. + */ +unsigned int zfcp_unit_sdev_status(struct zfcp_unit *unit) +{ + unsigned int status = 0; + struct scsi_device *sdev; + struct zfcp_scsi_dev *zfcp_sdev; + + sdev = zfcp_unit_sdev(unit); + if (sdev) { + zfcp_sdev = sdev_to_zfcp(sdev); + status = atomic_read(&zfcp_sdev->status); + scsi_device_put(sdev); + } + + return status; +} + +/** + * zfcp_unit_remove - Remove entry from list of configured units + * @port: The port where to remove the unit from the configuration + * @fcp_lun: The 64 bit LUN of the unit to remove + * + * Returns: -EINVAL if a unit with the specified LUN does not exist, + * 0 on success. + */ +int zfcp_unit_remove(struct zfcp_port *port, u64 fcp_lun) +{ + struct zfcp_unit *unit; + struct scsi_device *sdev; + + write_lock_irq(&port->unit_list_lock); + unit = _zfcp_unit_find(port, fcp_lun); + if (unit) + list_del(&unit->list); + write_unlock_irq(&port->unit_list_lock); + + if (!unit) + return -EINVAL; + + sdev = zfcp_unit_sdev(unit); + if (sdev) { + scsi_remove_device(sdev); + scsi_device_put(sdev); + } + + put_device(&unit->dev); + + device_unregister(&unit->dev); + + return 0; +} diff --git a/drivers/s390/virtio/Makefile b/drivers/s390/virtio/Makefile new file mode 100644 index 000000000..2dc4d9aab --- /dev/null +++ b/drivers/s390/virtio/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 +# Makefile for kvm guest drivers on s390 +# +# Copyright IBM Corp. 2008 + +obj-$(CONFIG_S390_GUEST) += virtio_ccw.o diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c new file mode 100644 index 000000000..0447ae278 --- /dev/null +++ b/drivers/s390/virtio/virtio_ccw.c @@ -0,0 +1,1467 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ccw based virtio transport + * + * Copyright IBM Corp. 2012, 2014 + * + * Author(s): Cornelia Huck + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * virtio related functions + */ + +struct vq_config_block { + __u16 index; + __u16 num; +} __packed; + +#define VIRTIO_CCW_CONFIG_SIZE 0x100 +/* same as PCI config space size, should be enough for all drivers */ + +struct virtio_ccw_device { + struct virtio_device vdev; + __u8 *status; + __u8 config[VIRTIO_CCW_CONFIG_SIZE]; + struct ccw_device *cdev; + __u32 curr_io; + int err; + unsigned int revision; /* Transport revision */ + wait_queue_head_t wait_q; + spinlock_t lock; + struct mutex io_lock; /* Serializes I/O requests */ + struct list_head virtqueues; + unsigned long indicators; + unsigned long indicators2; + struct vq_config_block *config_block; + bool is_thinint; + bool going_away; + bool device_lost; + unsigned int config_ready; + void *airq_info; +}; + +struct vq_info_block_legacy { + __u64 queue; + __u32 align; + __u16 index; + __u16 num; +} __packed; + +struct vq_info_block { + __u64 desc; + __u32 res0; + __u16 index; + __u16 num; + __u64 avail; + __u64 used; +} __packed; + +struct virtio_feature_desc { + __le32 features; + __u8 index; +} __packed; + +struct virtio_thinint_area { + unsigned long summary_indicator; + unsigned long indicator; + u64 bit_nr; + u8 isc; +} __packed; + +struct virtio_rev_info { + __u16 revision; + __u16 length; + __u8 data[]; +}; + +/* the highest virtio-ccw revision we support */ +#define VIRTIO_CCW_REV_MAX 2 + +struct virtio_ccw_vq_info { + struct virtqueue *vq; + int num; + void *queue; + union { + struct vq_info_block s; + struct vq_info_block_legacy l; + } *info_block; + int bit_nr; + struct list_head node; + long cookie; +}; + +#define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ + +#define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) +#define MAX_AIRQ_AREAS 20 + +static int virtio_ccw_use_airq = 1; + +struct airq_info { + rwlock_t lock; + u8 summary_indicator; + struct airq_struct airq; + struct airq_iv *aiv; +}; +static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; +static DEFINE_MUTEX(airq_areas_lock); + +#define CCW_CMD_SET_VQ 0x13 +#define CCW_CMD_VDEV_RESET 0x33 +#define CCW_CMD_SET_IND 0x43 +#define CCW_CMD_SET_CONF_IND 0x53 +#define CCW_CMD_READ_FEAT 0x12 +#define CCW_CMD_WRITE_FEAT 0x11 +#define CCW_CMD_READ_CONF 0x22 +#define CCW_CMD_WRITE_CONF 0x21 +#define CCW_CMD_WRITE_STATUS 0x31 +#define CCW_CMD_READ_VQ_CONF 0x32 +#define CCW_CMD_READ_STATUS 0x72 +#define CCW_CMD_SET_IND_ADAPTER 0x73 +#define CCW_CMD_SET_VIRTIO_REV 0x83 + +#define VIRTIO_CCW_DOING_SET_VQ 0x00010000 +#define VIRTIO_CCW_DOING_RESET 0x00040000 +#define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 +#define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 +#define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 +#define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 +#define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 +#define VIRTIO_CCW_DOING_SET_IND 0x01000000 +#define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 +#define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 +#define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 +#define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 +#define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 +#define VIRTIO_CCW_INTPARM_MASK 0xffff0000 + +static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) +{ + return container_of(vdev, struct virtio_ccw_device, vdev); +} + +static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) +{ + unsigned long i, flags; + + write_lock_irqsave(&info->lock, flags); + for (i = 0; i < airq_iv_end(info->aiv); i++) { + if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { + airq_iv_free_bit(info->aiv, i); + airq_iv_set_ptr(info->aiv, i, 0); + break; + } + } + write_unlock_irqrestore(&info->lock, flags); +} + +static void virtio_airq_handler(struct airq_struct *airq) +{ + struct airq_info *info = container_of(airq, struct airq_info, airq); + unsigned long ai; + + inc_irq_stat(IRQIO_VAI); + read_lock(&info->lock); + /* Walk through indicators field, summary indicator active. */ + for (ai = 0;;) { + ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); + if (ai == -1UL) + break; + vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); + } + info->summary_indicator = 0; + smp_wmb(); + /* Walk through indicators field, summary indicator not active. */ + for (ai = 0;;) { + ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); + if (ai == -1UL) + break; + vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); + } + read_unlock(&info->lock); +} + +static struct airq_info *new_airq_info(void) +{ + struct airq_info *info; + int rc; + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (!info) + return NULL; + rwlock_init(&info->lock); + info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR); + if (!info->aiv) { + kfree(info); + return NULL; + } + info->airq.handler = virtio_airq_handler; + info->airq.lsi_ptr = &info->summary_indicator; + info->airq.lsi_mask = 0xff; + info->airq.isc = VIRTIO_AIRQ_ISC; + rc = register_adapter_interrupt(&info->airq); + if (rc) { + airq_iv_release(info->aiv); + kfree(info); + return NULL; + } + return info; +} + +static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, + u64 *first, void **airq_info) +{ + int i, j; + struct airq_info *info; + unsigned long indicator_addr = 0; + unsigned long bit, flags; + + for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { + mutex_lock(&airq_areas_lock); + if (!airq_areas[i]) + airq_areas[i] = new_airq_info(); + info = airq_areas[i]; + mutex_unlock(&airq_areas_lock); + if (!info) + return 0; + write_lock_irqsave(&info->lock, flags); + bit = airq_iv_alloc(info->aiv, nvqs); + if (bit == -1UL) { + /* Not enough vacancies. */ + write_unlock_irqrestore(&info->lock, flags); + continue; + } + *first = bit; + *airq_info = info; + indicator_addr = (unsigned long)info->aiv->vector; + for (j = 0; j < nvqs; j++) { + airq_iv_set_ptr(info->aiv, bit + j, + (unsigned long)vqs[j]); + } + write_unlock_irqrestore(&info->lock, flags); + } + return indicator_addr; +} + +static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) +{ + struct virtio_ccw_vq_info *info; + + if (!vcdev->airq_info) + return; + list_for_each_entry(info, &vcdev->virtqueues, node) + drop_airq_indicator(info->vq, vcdev->airq_info); +} + +static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) +{ + unsigned long flags; + __u32 ret; + + spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); + if (vcdev->err) + ret = 0; + else + ret = vcdev->curr_io & flag; + spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); + return ret; +} + +static int ccw_io_helper(struct virtio_ccw_device *vcdev, + struct ccw1 *ccw, __u32 intparm) +{ + int ret; + unsigned long flags; + int flag = intparm & VIRTIO_CCW_INTPARM_MASK; + + mutex_lock(&vcdev->io_lock); + do { + spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); + ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); + if (!ret) { + if (!vcdev->curr_io) + vcdev->err = 0; + vcdev->curr_io |= flag; + } + spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); + cpu_relax(); + } while (ret == -EBUSY); + wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); + ret = ret ? ret : vcdev->err; + mutex_unlock(&vcdev->io_lock); + return ret; +} + +static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, + struct ccw1 *ccw) +{ + int ret; + unsigned long *indicatorp = NULL; + struct virtio_thinint_area *thinint_area = NULL; + struct airq_info *airq_info = vcdev->airq_info; + + if (vcdev->is_thinint) { + thinint_area = kzalloc(sizeof(*thinint_area), + GFP_DMA | GFP_KERNEL); + if (!thinint_area) + return; + thinint_area->summary_indicator = + (unsigned long) &airq_info->summary_indicator; + thinint_area->isc = VIRTIO_AIRQ_ISC; + ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; + ccw->count = sizeof(*thinint_area); + ccw->cda = (__u32)(unsigned long) thinint_area; + } else { + /* payload is the address of the indicators */ + indicatorp = kmalloc(sizeof(&vcdev->indicators), + GFP_DMA | GFP_KERNEL); + if (!indicatorp) + return; + *indicatorp = 0; + ccw->cmd_code = CCW_CMD_SET_IND; + ccw->count = sizeof(&vcdev->indicators); + ccw->cda = (__u32)(unsigned long) indicatorp; + } + /* Deregister indicators from host. */ + vcdev->indicators = 0; + ccw->flags = 0; + ret = ccw_io_helper(vcdev, ccw, + vcdev->is_thinint ? + VIRTIO_CCW_DOING_SET_IND_ADAPTER : + VIRTIO_CCW_DOING_SET_IND); + if (ret && (ret != -ENODEV)) + dev_info(&vcdev->cdev->dev, + "Failed to deregister indicators (%d)\n", ret); + else if (vcdev->is_thinint) + virtio_ccw_drop_indicators(vcdev); + kfree(indicatorp); + kfree(thinint_area); +} + +static inline long __do_kvm_notify(struct subchannel_id schid, + unsigned long queue_index, + long cookie) +{ + register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; + register struct subchannel_id __schid asm("2") = schid; + register unsigned long __index asm("3") = queue_index; + register long __rc asm("2"); + register long __cookie asm("4") = cookie; + + asm volatile ("diag 2,4,0x500\n" + : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), + "d"(__cookie) + : "memory", "cc"); + return __rc; +} + +static inline long do_kvm_notify(struct subchannel_id schid, + unsigned long queue_index, + long cookie) +{ + diag_stat_inc(DIAG_STAT_X500); + return __do_kvm_notify(schid, queue_index, cookie); +} + +static bool virtio_ccw_kvm_notify(struct virtqueue *vq) +{ + struct virtio_ccw_vq_info *info = vq->priv; + struct virtio_ccw_device *vcdev; + struct subchannel_id schid; + + vcdev = to_vc_device(info->vq->vdev); + ccw_device_get_schid(vcdev->cdev, &schid); + info->cookie = do_kvm_notify(schid, vq->index, info->cookie); + if (info->cookie < 0) + return false; + return true; +} + +static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, + struct ccw1 *ccw, int index) +{ + int ret; + + vcdev->config_block->index = index; + ccw->cmd_code = CCW_CMD_READ_VQ_CONF; + ccw->flags = 0; + ccw->count = sizeof(struct vq_config_block); + ccw->cda = (__u32)(unsigned long)(vcdev->config_block); + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); + if (ret) + return ret; + return vcdev->config_block->num ?: -ENOENT; +} + +static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) +{ + struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); + struct virtio_ccw_vq_info *info = vq->priv; + unsigned long flags; + unsigned long size; + int ret; + unsigned int index = vq->index; + + /* Remove from our list. */ + spin_lock_irqsave(&vcdev->lock, flags); + list_del(&info->node); + spin_unlock_irqrestore(&vcdev->lock, flags); + + /* Release from host. */ + if (vcdev->revision == 0) { + info->info_block->l.queue = 0; + info->info_block->l.align = 0; + info->info_block->l.index = index; + info->info_block->l.num = 0; + ccw->count = sizeof(info->info_block->l); + } else { + info->info_block->s.desc = 0; + info->info_block->s.index = index; + info->info_block->s.num = 0; + info->info_block->s.avail = 0; + info->info_block->s.used = 0; + ccw->count = sizeof(info->info_block->s); + } + ccw->cmd_code = CCW_CMD_SET_VQ; + ccw->flags = 0; + ccw->cda = (__u32)(unsigned long)(info->info_block); + ret = ccw_io_helper(vcdev, ccw, + VIRTIO_CCW_DOING_SET_VQ | index); + /* + * -ENODEV isn't considered an error: The device is gone anyway. + * This may happen on device detach. + */ + if (ret && (ret != -ENODEV)) + dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", + ret, index); + + vring_del_virtqueue(vq); + size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); + free_pages_exact(info->queue, size); + kfree(info->info_block); + kfree(info); +} + +static void virtio_ccw_del_vqs(struct virtio_device *vdev) +{ + struct virtqueue *vq, *n; + struct ccw1 *ccw; + struct virtio_ccw_device *vcdev = to_vc_device(vdev); + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return; + + virtio_ccw_drop_indicator(vcdev, ccw); + + list_for_each_entry_safe(vq, n, &vdev->vqs, list) + virtio_ccw_del_vq(vq, ccw); + + kfree(ccw); +} + +static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, + int i, vq_callback_t *callback, + const char *name, bool ctx, + struct ccw1 *ccw) +{ + struct virtio_ccw_device *vcdev = to_vc_device(vdev); + int err; + struct virtqueue *vq = NULL; + struct virtio_ccw_vq_info *info; + unsigned long size = 0; /* silence the compiler */ + unsigned long flags; + + /* Allocate queue. */ + info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); + if (!info) { + dev_warn(&vcdev->cdev->dev, "no info\n"); + err = -ENOMEM; + goto out_err; + } + info->info_block = kzalloc(sizeof(*info->info_block), + GFP_DMA | GFP_KERNEL); + if (!info->info_block) { + dev_warn(&vcdev->cdev->dev, "no info block\n"); + err = -ENOMEM; + goto out_err; + } + info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); + if (info->num < 0) { + err = info->num; + goto out_err; + } + size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); + info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); + if (info->queue == NULL) { + dev_warn(&vcdev->cdev->dev, "no queue\n"); + err = -ENOMEM; + goto out_err; + } + + vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, + true, ctx, info->queue, virtio_ccw_kvm_notify, + callback, name); + if (!vq) { + /* For now, we fail if we can't get the requested size. */ + dev_warn(&vcdev->cdev->dev, "no vq\n"); + err = -ENOMEM; + goto out_err; + } + + /* Register it with the host. */ + if (vcdev->revision == 0) { + info->info_block->l.queue = (__u64)info->queue; + info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; + info->info_block->l.index = i; + info->info_block->l.num = info->num; + ccw->count = sizeof(info->info_block->l); + } else { + info->info_block->s.desc = (__u64)info->queue; + info->info_block->s.index = i; + info->info_block->s.num = info->num; + info->info_block->s.avail = (__u64)virtqueue_get_avail(vq); + info->info_block->s.used = (__u64)virtqueue_get_used(vq); + ccw->count = sizeof(info->info_block->s); + } + ccw->cmd_code = CCW_CMD_SET_VQ; + ccw->flags = 0; + ccw->cda = (__u32)(unsigned long)(info->info_block); + err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); + if (err) { + dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); + goto out_err; + } + + info->vq = vq; + vq->priv = info; + + /* Save it to our list. */ + spin_lock_irqsave(&vcdev->lock, flags); + list_add(&info->node, &vcdev->virtqueues); + spin_unlock_irqrestore(&vcdev->lock, flags); + + return vq; + +out_err: + if (vq) + vring_del_virtqueue(vq); + if (info) { + if (info->queue) + free_pages_exact(info->queue, size); + kfree(info->info_block); + } + kfree(info); + return ERR_PTR(err); +} + +static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, + struct virtqueue *vqs[], int nvqs, + struct ccw1 *ccw) +{ + int ret; + struct virtio_thinint_area *thinint_area = NULL; + struct airq_info *info; + + thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL); + if (!thinint_area) { + ret = -ENOMEM; + goto out; + } + /* Try to get an indicator. */ + thinint_area->indicator = get_airq_indicator(vqs, nvqs, + &thinint_area->bit_nr, + &vcdev->airq_info); + if (!thinint_area->indicator) { + ret = -ENOSPC; + goto out; + } + info = vcdev->airq_info; + thinint_area->summary_indicator = + (unsigned long) &info->summary_indicator; + thinint_area->isc = VIRTIO_AIRQ_ISC; + ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; + ccw->flags = CCW_FLAG_SLI; + ccw->count = sizeof(*thinint_area); + ccw->cda = (__u32)(unsigned long)thinint_area; + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); + if (ret) { + if (ret == -EOPNOTSUPP) { + /* + * The host does not support adapter interrupts + * for virtio-ccw, stop trying. + */ + virtio_ccw_use_airq = 0; + pr_info("Adapter interrupts unsupported on host\n"); + } else + dev_warn(&vcdev->cdev->dev, + "enabling adapter interrupts = %d\n", ret); + virtio_ccw_drop_indicators(vcdev); + } +out: + kfree(thinint_area); + return ret; +} + +static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, + struct virtqueue *vqs[], + vq_callback_t *callbacks[], + const char * const names[], + const bool *ctx, + struct irq_affinity *desc) +{ + struct virtio_ccw_device *vcdev = to_vc_device(vdev); + unsigned long *indicatorp = NULL; + int ret, i; + struct ccw1 *ccw; + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return -ENOMEM; + + for (i = 0; i < nvqs; ++i) { + vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i], + ctx ? ctx[i] : false, ccw); + if (IS_ERR(vqs[i])) { + ret = PTR_ERR(vqs[i]); + vqs[i] = NULL; + goto out; + } + } + ret = -ENOMEM; + /* + * We need a data area under 2G to communicate. Our payload is + * the address of the indicators. + */ + indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); + if (!indicatorp) + goto out; + *indicatorp = (unsigned long) &vcdev->indicators; + if (vcdev->is_thinint) { + ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); + if (ret) + /* no error, just fall back to legacy interrupts */ + vcdev->is_thinint = false; + } + if (!vcdev->is_thinint) { + /* Register queue indicators with host. */ + vcdev->indicators = 0; + ccw->cmd_code = CCW_CMD_SET_IND; + ccw->flags = 0; + ccw->count = sizeof(&vcdev->indicators); + ccw->cda = (__u32)(unsigned long) indicatorp; + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); + if (ret) + goto out; + } + /* Register indicators2 with host for config changes */ + *indicatorp = (unsigned long) &vcdev->indicators2; + vcdev->indicators2 = 0; + ccw->cmd_code = CCW_CMD_SET_CONF_IND; + ccw->flags = 0; + ccw->count = sizeof(&vcdev->indicators2); + ccw->cda = (__u32)(unsigned long) indicatorp; + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); + if (ret) + goto out; + + kfree(indicatorp); + kfree(ccw); + return 0; +out: + kfree(indicatorp); + kfree(ccw); + virtio_ccw_del_vqs(vdev); + return ret; +} + +static void virtio_ccw_reset(struct virtio_device *vdev) +{ + struct virtio_ccw_device *vcdev = to_vc_device(vdev); + struct ccw1 *ccw; + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return; + + /* Zero status bits. */ + *vcdev->status = 0; + + /* Send a reset ccw on device. */ + ccw->cmd_code = CCW_CMD_VDEV_RESET; + ccw->flags = 0; + ccw->count = 0; + ccw->cda = 0; + ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); + kfree(ccw); +} + +static u64 virtio_ccw_get_features(struct virtio_device *vdev) +{ + struct virtio_ccw_device *vcdev = to_vc_device(vdev); + struct virtio_feature_desc *features; + int ret; + u64 rc; + struct ccw1 *ccw; + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return 0; + + features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); + if (!features) { + rc = 0; + goto out_free; + } + /* Read the feature bits from the host. */ + features->index = 0; + ccw->cmd_code = CCW_CMD_READ_FEAT; + ccw->flags = 0; + ccw->count = sizeof(*features); + ccw->cda = (__u32)(unsigned long)features; + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); + if (ret) { + rc = 0; + goto out_free; + } + + rc = le32_to_cpu(features->features); + + if (vcdev->revision == 0) + goto out_free; + + /* Read second half of the feature bits from the host. */ + features->index = 1; + ccw->cmd_code = CCW_CMD_READ_FEAT; + ccw->flags = 0; + ccw->count = sizeof(*features); + ccw->cda = (__u32)(unsigned long)features; + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); + if (ret == 0) + rc |= (u64)le32_to_cpu(features->features) << 32; + +out_free: + kfree(features); + kfree(ccw); + return rc; +} + +static int virtio_ccw_finalize_features(struct virtio_device *vdev) +{ + struct virtio_ccw_device *vcdev = to_vc_device(vdev); + struct virtio_feature_desc *features; + struct ccw1 *ccw; + int ret; + + if (vcdev->revision >= 1 && + !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { + dev_err(&vdev->dev, "virtio: device uses revision 1 " + "but does not have VIRTIO_F_VERSION_1\n"); + return -EINVAL; + } + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return -ENOMEM; + + features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); + if (!features) { + ret = -ENOMEM; + goto out_free; + } + /* Give virtio_ring a chance to accept features. */ + vring_transport_features(vdev); + + features->index = 0; + features->features = cpu_to_le32((u32)vdev->features); + /* Write the first half of the feature bits to the host. */ + ccw->cmd_code = CCW_CMD_WRITE_FEAT; + ccw->flags = 0; + ccw->count = sizeof(*features); + ccw->cda = (__u32)(unsigned long)features; + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); + if (ret) + goto out_free; + + if (vcdev->revision == 0) + goto out_free; + + features->index = 1; + features->features = cpu_to_le32(vdev->features >> 32); + /* Write the second half of the feature bits to the host. */ + ccw->cmd_code = CCW_CMD_WRITE_FEAT; + ccw->flags = 0; + ccw->count = sizeof(*features); + ccw->cda = (__u32)(unsigned long)features; + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); + +out_free: + kfree(features); + kfree(ccw); + + return ret; +} + +static void virtio_ccw_get_config(struct virtio_device *vdev, + unsigned int offset, void *buf, unsigned len) +{ + struct virtio_ccw_device *vcdev = to_vc_device(vdev); + int ret; + struct ccw1 *ccw; + void *config_area; + unsigned long flags; + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return; + + config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); + if (!config_area) + goto out_free; + + /* Read the config area from the host. */ + ccw->cmd_code = CCW_CMD_READ_CONF; + ccw->flags = 0; + ccw->count = offset + len; + ccw->cda = (__u32)(unsigned long)config_area; + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); + if (ret) + goto out_free; + + spin_lock_irqsave(&vcdev->lock, flags); + memcpy(vcdev->config, config_area, offset + len); + if (vcdev->config_ready < offset + len) + vcdev->config_ready = offset + len; + spin_unlock_irqrestore(&vcdev->lock, flags); + if (buf) + memcpy(buf, config_area + offset, len); + +out_free: + kfree(config_area); + kfree(ccw); +} + +static void virtio_ccw_set_config(struct virtio_device *vdev, + unsigned int offset, const void *buf, + unsigned len) +{ + struct virtio_ccw_device *vcdev = to_vc_device(vdev); + struct ccw1 *ccw; + void *config_area; + unsigned long flags; + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return; + + config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); + if (!config_area) + goto out_free; + + /* Make sure we don't overwrite fields. */ + if (vcdev->config_ready < offset) + virtio_ccw_get_config(vdev, 0, NULL, offset); + spin_lock_irqsave(&vcdev->lock, flags); + memcpy(&vcdev->config[offset], buf, len); + /* Write the config area to the host. */ + memcpy(config_area, vcdev->config, sizeof(vcdev->config)); + spin_unlock_irqrestore(&vcdev->lock, flags); + ccw->cmd_code = CCW_CMD_WRITE_CONF; + ccw->flags = 0; + ccw->count = offset + len; + ccw->cda = (__u32)(unsigned long)config_area; + ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); + +out_free: + kfree(config_area); + kfree(ccw); +} + +static u8 virtio_ccw_get_status(struct virtio_device *vdev) +{ + struct virtio_ccw_device *vcdev = to_vc_device(vdev); + u8 old_status = *vcdev->status; + struct ccw1 *ccw; + + if (vcdev->revision < 2) + return *vcdev->status; + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return old_status; + + ccw->cmd_code = CCW_CMD_READ_STATUS; + ccw->flags = 0; + ccw->count = sizeof(*vcdev->status); + ccw->cda = (__u32)(unsigned long)vcdev->status; + ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); +/* + * If the channel program failed (should only happen if the device + * was hotunplugged, and then we clean up via the machine check + * handler anyway), vcdev->status was not overwritten and we just + * return the old status, which is fine. +*/ + kfree(ccw); + + return *vcdev->status; +} + +static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) +{ + struct virtio_ccw_device *vcdev = to_vc_device(vdev); + u8 old_status = *vcdev->status; + struct ccw1 *ccw; + int ret; + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return; + + /* Write the status to the host. */ + *vcdev->status = status; + ccw->cmd_code = CCW_CMD_WRITE_STATUS; + ccw->flags = 0; + ccw->count = sizeof(status); + ccw->cda = (__u32)(unsigned long)vcdev->status; + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); + /* Write failed? We assume status is unchanged. */ + if (ret) + *vcdev->status = old_status; + kfree(ccw); +} + +static const struct virtio_config_ops virtio_ccw_config_ops = { + .get_features = virtio_ccw_get_features, + .finalize_features = virtio_ccw_finalize_features, + .get = virtio_ccw_get_config, + .set = virtio_ccw_set_config, + .get_status = virtio_ccw_get_status, + .set_status = virtio_ccw_set_status, + .reset = virtio_ccw_reset, + .find_vqs = virtio_ccw_find_vqs, + .del_vqs = virtio_ccw_del_vqs, +}; + + +/* + * ccw bus driver related functions + */ + +static void virtio_ccw_release_dev(struct device *_d) +{ + struct virtio_device *dev = dev_to_virtio(_d); + struct virtio_ccw_device *vcdev = to_vc_device(dev); + + kfree(vcdev->status); + kfree(vcdev->config_block); + kfree(vcdev); +} + +static int irb_is_error(struct irb *irb) +{ + if (scsw_cstat(&irb->scsw) != 0) + return 1; + if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) + return 1; + if (scsw_cc(&irb->scsw) != 0) + return 1; + return 0; +} + +static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, + int index) +{ + struct virtio_ccw_vq_info *info; + unsigned long flags; + struct virtqueue *vq; + + vq = NULL; + spin_lock_irqsave(&vcdev->lock, flags); + list_for_each_entry(info, &vcdev->virtqueues, node) { + if (info->vq->index == index) { + vq = info->vq; + break; + } + } + spin_unlock_irqrestore(&vcdev->lock, flags); + return vq; +} + +static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, + __u32 activity) +{ + if (vcdev->curr_io & activity) { + switch (activity) { + case VIRTIO_CCW_DOING_READ_FEAT: + case VIRTIO_CCW_DOING_WRITE_FEAT: + case VIRTIO_CCW_DOING_READ_CONFIG: + case VIRTIO_CCW_DOING_WRITE_CONFIG: + case VIRTIO_CCW_DOING_WRITE_STATUS: + case VIRTIO_CCW_DOING_READ_STATUS: + case VIRTIO_CCW_DOING_SET_VQ: + case VIRTIO_CCW_DOING_SET_IND: + case VIRTIO_CCW_DOING_SET_CONF_IND: + case VIRTIO_CCW_DOING_RESET: + case VIRTIO_CCW_DOING_READ_VQ_CONF: + case VIRTIO_CCW_DOING_SET_IND_ADAPTER: + case VIRTIO_CCW_DOING_SET_VIRTIO_REV: + vcdev->curr_io &= ~activity; + wake_up(&vcdev->wait_q); + break; + default: + /* don't know what to do... */ + dev_warn(&vcdev->cdev->dev, + "Suspicious activity '%08x'\n", activity); + WARN_ON(1); + break; + } + } +} + +static void virtio_ccw_int_handler(struct ccw_device *cdev, + unsigned long intparm, + struct irb *irb) +{ + __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; + struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); + int i; + struct virtqueue *vq; + + if (!vcdev) + return; + if (IS_ERR(irb)) { + vcdev->err = PTR_ERR(irb); + virtio_ccw_check_activity(vcdev, activity); + /* Don't poke around indicators, something's wrong. */ + return; + } + /* Check if it's a notification from the host. */ + if ((intparm == 0) && + (scsw_stctl(&irb->scsw) == + (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { + /* OK */ + } + if (irb_is_error(irb)) { + /* Command reject? */ + if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && + (irb->ecw[0] & SNS0_CMD_REJECT)) + vcdev->err = -EOPNOTSUPP; + else + /* Map everything else to -EIO. */ + vcdev->err = -EIO; + } + virtio_ccw_check_activity(vcdev, activity); + for_each_set_bit(i, &vcdev->indicators, + sizeof(vcdev->indicators) * BITS_PER_BYTE) { + /* The bit clear must happen before the vring kick. */ + clear_bit(i, &vcdev->indicators); + barrier(); + vq = virtio_ccw_vq_by_ind(vcdev, i); + vring_interrupt(0, vq); + } + if (test_bit(0, &vcdev->indicators2)) { + virtio_config_changed(&vcdev->vdev); + clear_bit(0, &vcdev->indicators2); + } +} + +/* + * We usually want to autoonline all devices, but give the admin + * a way to exempt devices from this. + */ +#define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ + (8*sizeof(long))) +static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; + +static char *no_auto = ""; + +module_param(no_auto, charp, 0444); +MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); + +static int virtio_ccw_check_autoonline(struct ccw_device *cdev) +{ + struct ccw_dev_id id; + + ccw_device_get_id(cdev, &id); + if (test_bit(id.devno, devs_no_auto[id.ssid])) + return 0; + return 1; +} + +static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) +{ + struct ccw_device *cdev = data; + int ret; + + ret = ccw_device_set_online(cdev); + if (ret) + dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); +} + +static int virtio_ccw_probe(struct ccw_device *cdev) +{ + cdev->handler = virtio_ccw_int_handler; + + if (virtio_ccw_check_autoonline(cdev)) + async_schedule(virtio_ccw_auto_online, cdev); + return 0; +} + +static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) +{ + unsigned long flags; + struct virtio_ccw_device *vcdev; + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + vcdev = dev_get_drvdata(&cdev->dev); + if (!vcdev || vcdev->going_away) { + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + return NULL; + } + vcdev->going_away = true; + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + return vcdev; +} + +static void virtio_ccw_remove(struct ccw_device *cdev) +{ + unsigned long flags; + struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); + + if (vcdev && cdev->online) { + if (vcdev->device_lost) + virtio_break_device(&vcdev->vdev); + unregister_virtio_device(&vcdev->vdev); + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + dev_set_drvdata(&cdev->dev, NULL); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + } + cdev->handler = NULL; +} + +static int virtio_ccw_offline(struct ccw_device *cdev) +{ + unsigned long flags; + struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); + + if (!vcdev) + return 0; + if (vcdev->device_lost) + virtio_break_device(&vcdev->vdev); + unregister_virtio_device(&vcdev->vdev); + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + dev_set_drvdata(&cdev->dev, NULL); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + return 0; +} + +static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) +{ + struct virtio_rev_info *rev; + struct ccw1 *ccw; + int ret; + + ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); + if (!ccw) + return -ENOMEM; + rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); + if (!rev) { + kfree(ccw); + return -ENOMEM; + } + + /* Set transport revision */ + ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; + ccw->flags = 0; + ccw->count = sizeof(*rev); + ccw->cda = (__u32)(unsigned long)rev; + + vcdev->revision = VIRTIO_CCW_REV_MAX; + do { + rev->revision = vcdev->revision; + /* none of our supported revisions carry payload */ + rev->length = 0; + ret = ccw_io_helper(vcdev, ccw, + VIRTIO_CCW_DOING_SET_VIRTIO_REV); + if (ret == -EOPNOTSUPP) { + if (vcdev->revision == 0) + /* + * The host device does not support setting + * the revision: let's operate it in legacy + * mode. + */ + ret = 0; + else + vcdev->revision--; + } + } while (ret == -EOPNOTSUPP); + + kfree(ccw); + kfree(rev); + return ret; +} + +static int virtio_ccw_online(struct ccw_device *cdev) +{ + int ret; + struct virtio_ccw_device *vcdev; + unsigned long flags; + + vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); + if (!vcdev) { + dev_warn(&cdev->dev, "Could not get memory for virtio\n"); + ret = -ENOMEM; + goto out_free; + } + vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), + GFP_DMA | GFP_KERNEL); + if (!vcdev->config_block) { + ret = -ENOMEM; + goto out_free; + } + vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); + if (!vcdev->status) { + ret = -ENOMEM; + goto out_free; + } + + vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ + + vcdev->vdev.dev.parent = &cdev->dev; + vcdev->vdev.dev.release = virtio_ccw_release_dev; + vcdev->vdev.config = &virtio_ccw_config_ops; + vcdev->cdev = cdev; + init_waitqueue_head(&vcdev->wait_q); + INIT_LIST_HEAD(&vcdev->virtqueues); + spin_lock_init(&vcdev->lock); + mutex_init(&vcdev->io_lock); + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + dev_set_drvdata(&cdev->dev, vcdev); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + vcdev->vdev.id.vendor = cdev->id.cu_type; + vcdev->vdev.id.device = cdev->id.cu_model; + + ret = virtio_ccw_set_transport_rev(vcdev); + if (ret) + goto out_free; + + ret = register_virtio_device(&vcdev->vdev); + if (ret) { + dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", + ret); + goto out_put; + } + return 0; +out_put: + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + dev_set_drvdata(&cdev->dev, NULL); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + put_device(&vcdev->vdev.dev); + return ret; +out_free: + if (vcdev) { + kfree(vcdev->status); + kfree(vcdev->config_block); + } + kfree(vcdev); + return ret; +} + +static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) +{ + int rc; + struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); + + /* + * Make sure vcdev is set + * i.e. set_offline/remove callback not already running + */ + if (!vcdev) + return NOTIFY_DONE; + + switch (event) { + case CIO_GONE: + vcdev->device_lost = true; + rc = NOTIFY_DONE; + break; + case CIO_OPER: + rc = NOTIFY_OK; + break; + default: + rc = NOTIFY_DONE; + break; + } + return rc; +} + +static struct ccw_device_id virtio_ids[] = { + { CCW_DEVICE(0x3832, 0) }, + {}, +}; + +#ifdef CONFIG_PM_SLEEP +static int virtio_ccw_freeze(struct ccw_device *cdev) +{ + struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); + + return virtio_device_freeze(&vcdev->vdev); +} + +static int virtio_ccw_restore(struct ccw_device *cdev) +{ + struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); + int ret; + + ret = virtio_ccw_set_transport_rev(vcdev); + if (ret) + return ret; + + return virtio_device_restore(&vcdev->vdev); +} +#endif + +static struct ccw_driver virtio_ccw_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "virtio_ccw", + }, + .ids = virtio_ids, + .probe = virtio_ccw_probe, + .remove = virtio_ccw_remove, + .set_offline = virtio_ccw_offline, + .set_online = virtio_ccw_online, + .notify = virtio_ccw_cio_notify, + .int_class = IRQIO_VIR, +#ifdef CONFIG_PM_SLEEP + .freeze = virtio_ccw_freeze, + .thaw = virtio_ccw_restore, + .restore = virtio_ccw_restore, +#endif +}; + +static int __init pure_hex(char **cp, unsigned int *val, int min_digit, + int max_digit, int max_val) +{ + int diff; + + diff = 0; + *val = 0; + + while (diff <= max_digit) { + int value = hex_to_bin(**cp); + + if (value < 0) + break; + *val = *val * 16 + value; + (*cp)++; + diff++; + } + + if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) + return 1; + + return 0; +} + +static int __init parse_busid(char *str, unsigned int *cssid, + unsigned int *ssid, unsigned int *devno) +{ + char *str_work; + int rc, ret; + + rc = 1; + + if (*str == '\0') + goto out; + + str_work = str; + ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); + if (ret || (str_work[0] != '.')) + goto out; + str_work++; + ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); + if (ret || (str_work[0] != '.')) + goto out; + str_work++; + ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); + if (ret || (str_work[0] != '\0')) + goto out; + + rc = 0; +out: + return rc; +} + +static void __init no_auto_parse(void) +{ + unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; + char *parm, *str; + int rc; + + str = no_auto; + while ((parm = strsep(&str, ","))) { + rc = parse_busid(strsep(&parm, "-"), &from_cssid, + &from_ssid, &from); + if (rc) + continue; + if (parm != NULL) { + rc = parse_busid(parm, &to_cssid, + &to_ssid, &to); + if ((from_ssid > to_ssid) || + ((from_ssid == to_ssid) && (from > to))) + rc = -EINVAL; + } else { + to_cssid = from_cssid; + to_ssid = from_ssid; + to = from; + } + if (rc) + continue; + while ((from_ssid < to_ssid) || + ((from_ssid == to_ssid) && (from <= to))) { + set_bit(from, devs_no_auto[from_ssid]); + from++; + if (from > __MAX_SUBCHANNEL) { + from_ssid++; + from = 0; + } + } + } +} + +static int __init virtio_ccw_init(void) +{ + /* parse no_auto string before we do anything further */ + no_auto_parse(); + return ccw_driver_register(&virtio_ccw_driver); +} +device_initcall(virtio_ccw_init); -- cgit v1.2.3