diff options
Diffstat (limited to 'drivers/s390/scsi/zfcp_aux.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_aux.c | 586 |
1 files changed, 586 insertions, 0 deletions
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 <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/module.h> +#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; +} |