diff options
Diffstat (limited to 'drivers/s390/block/dasd_fba.c')
| -rw-r--r-- | drivers/s390/block/dasd_fba.c | 835 |
1 files changed, 835 insertions, 0 deletions
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 <Holger.Smolinski@de.ibm.com> + * Bugreports.to..: <Linux390@de.ibm.com> + * Copyright IBM Corp. 1999, 2009 + */ + +#define KMSG_COMPONENT "dasd-fba" + +#include <linux/stddef.h> +#include <linux/kernel.h> +#include <asm/debug.h> + +#include <linux/slab.h> +#include <linux/hdreg.h> /* HDIO_GETGEO */ +#include <linux/bio.h> +#include <linux/module.h> +#include <linux/init.h> + +#include <asm/idals.h> +#include <asm/ebcdic.h> +#include <asm/io.h> +#include <asm/ccwdev.h> + +#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); |