2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Bugreports.to..: <Linux390@de.ibm.com>
4 * Copyright IBM Corp. 1999, 2009
7 #define KMSG_COMPONENT "dasd-fba"
9 #include <linux/stddef.h>
10 #include <linux/kernel.h>
11 #include <asm/debug.h>
13 #include <linux/slab.h>
14 #include <linux/hdreg.h> /* HDIO_GETGEO */
15 #include <linux/bio.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
19 #include <asm/idals.h>
20 #include <asm/ebcdic.h>
22 #include <asm/ccwdev.h>
29 #endif /* PRINTK_HEADER */
30 #define PRINTK_HEADER "dasd(fba):"
32 #define FBA_DEFAULT_RETRIES 32
34 #define DASD_FBA_CCW_WRITE 0x41
35 #define DASD_FBA_CCW_READ 0x42
36 #define DASD_FBA_CCW_LOCATE 0x43
37 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
39 MODULE_LICENSE("GPL");
41 static struct dasd_discipline dasd_fba_discipline;
43 struct dasd_fba_private {
44 struct dasd_fba_characteristics rdc_data;
47 static struct ccw_device_id dasd_fba_ids[] = {
48 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
49 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
50 { /* end of list */ },
53 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
55 static struct ccw_driver dasd_fba_driver; /* see below */
57 dasd_fba_probe(struct ccw_device *cdev)
59 return dasd_generic_probe(cdev, &dasd_fba_discipline);
63 dasd_fba_set_online(struct ccw_device *cdev)
65 return dasd_generic_set_online(cdev, &dasd_fba_discipline);
68 static struct ccw_driver dasd_fba_driver = {
74 .probe = dasd_fba_probe,
75 .remove = dasd_generic_remove,
76 .set_offline = dasd_generic_set_offline,
77 .set_online = dasd_fba_set_online,
78 .notify = dasd_generic_notify,
79 .path_event = dasd_generic_path_event,
80 .freeze = dasd_generic_pm_freeze,
81 .thaw = dasd_generic_restore_device,
82 .restore = dasd_generic_restore_device,
83 .int_class = IRQIO_DAS,
87 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
88 int blksize, int beg, int nr)
90 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
93 ccw->cda = (__u32) __pa(data);
94 memset(data, 0, sizeof (struct DE_fba_data));
96 (data->mask).perm = 0x0;
98 (data->mask).perm = 0x1;
100 data->mask.perm = 0x2;
101 data->blk_size = blksize;
103 data->ext_end = nr - 1;
107 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
108 int block_nr, int block_ct)
110 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
113 ccw->cda = (__u32) __pa(data);
114 memset(data, 0, sizeof (struct LO_fba_data));
116 data->operation.cmd = 0x5;
118 data->operation.cmd = 0x6;
120 data->operation.cmd = 0x8;
121 data->blk_nr = block_nr;
122 data->blk_ct = block_ct;
126 dasd_fba_check_characteristics(struct dasd_device *device)
128 struct dasd_fba_private *private = device->private;
129 struct ccw_device *cdev = device->cdev;
130 struct dasd_block *block;
134 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
136 dev_warn(&device->cdev->dev,
137 "Allocating memory for private DASD "
141 device->private = private;
143 memset(private, 0, sizeof(*private));
145 block = dasd_alloc_block();
147 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
148 "dasd block structure");
149 device->private = NULL;
151 return PTR_ERR(block);
153 device->block = block;
154 block->base = device;
156 /* Read Device Characteristics */
157 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
158 &private->rdc_data, 32);
160 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
161 "characteristics returned error %d", rc);
162 device->block = NULL;
163 dasd_free_block(block);
164 device->private = NULL;
169 device->default_expires = DASD_EXPIRES;
170 device->default_retries = FBA_DEFAULT_RETRIES;
171 dasd_path_set_opm(device, LPM_ANYPATH);
173 readonly = dasd_device_is_ro(device);
175 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
177 /* FBA supports discard, set the according feature bit */
178 dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);
180 dev_info(&device->cdev->dev,
181 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
187 ((private->rdc_data.blk_bdsa *
188 (private->rdc_data.blk_size >> 9)) >> 11),
189 private->rdc_data.blk_size,
190 readonly ? ", read-only device" : "");
194 static int dasd_fba_do_analysis(struct dasd_block *block)
196 struct dasd_fba_private *private = block->base->private;
199 rc = dasd_check_blocksize(private->rdc_data.blk_size);
201 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
202 private->rdc_data.blk_size);
205 block->blocks = private->rdc_data.blk_bdsa;
206 block->bp_block = private->rdc_data.blk_size;
207 block->s2b_shift = 0; /* bits to shift 512 to get a block */
208 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
213 static int dasd_fba_fill_geometry(struct dasd_block *block,
214 struct hd_geometry *geo)
216 if (dasd_check_blocksize(block->bp_block) != 0)
218 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
220 geo->sectors = 128 >> block->s2b_shift;
225 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
227 return dasd_default_erp_action;
231 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
233 if (cqr->function == dasd_default_erp_action)
234 return dasd_default_erp_postaction;
236 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
241 static void dasd_fba_check_for_device_change(struct dasd_device *device,
242 struct dasd_ccw_req *cqr,
247 /* first of all check for state change pending interrupt */
248 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
249 if ((irb->scsw.cmd.dstat & mask) == mask)
250 dasd_generic_handle_state_change(device);
255 * Builds a CCW with no data payload
257 static void ccw_write_no_data(struct ccw1 *ccw)
259 ccw->cmd_code = DASD_FBA_CCW_WRITE;
260 ccw->flags |= CCW_FLAG_SLI;
265 * Builds a CCW that writes only zeroes.
267 static void ccw_write_zero(struct ccw1 *ccw, int count)
269 ccw->cmd_code = DASD_FBA_CCW_WRITE;
270 ccw->flags |= CCW_FLAG_SLI;
272 ccw->cda = (__u32) (addr_t) page_to_phys(ZERO_PAGE(0));
276 * Helper function to count the amount of necessary CCWs within a given range
277 * with 4k alignment and command chaining in mind.
279 static int count_ccws(sector_t first_rec, sector_t last_rec,
280 unsigned int blocks_per_page)
282 sector_t wz_stop = 0, d_stop = 0;
286 if (first_rec % blocks_per_page != 0) {
287 wz_stop = first_rec + blocks_per_page -
288 (first_rec % blocks_per_page) - 1;
289 if (wz_stop > last_rec)
291 cur_pos = wz_stop - first_rec + 1;
295 if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
296 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
297 d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
302 cur_pos += d_stop - (first_rec + cur_pos) + 1;
306 if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec)
313 * This function builds a CCW request for block layer discard requests.
314 * Each page in the z/VM hypervisor that represents certain records of an FBA
315 * device will be padded with zeros. This is a special behaviour of the WRITE
316 * command which is triggered when no data payload is added to the CCW.
318 * Note: Due to issues in some z/VM versions, we can't fully utilise this
319 * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to
320 * work around those issues and write actual zeroes to the unaligned parts in
321 * the request. This workaround might be removed in the future.
323 static struct dasd_ccw_req *dasd_fba_build_cp_discard(
324 struct dasd_device *memdev,
325 struct dasd_block *block,
328 struct LO_fba_data *LO_data;
329 struct dasd_ccw_req *cqr;
332 sector_t wz_stop = 0, d_stop = 0;
333 sector_t first_rec, last_rec;
335 unsigned int blksize = block->bp_block;
336 unsigned int blocks_per_page;
339 int cur_pos = 0; /* Current position within the extent */
345 first_rec = blk_rq_pos(req) >> block->s2b_shift;
347 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
348 count = last_rec - first_rec + 1;
350 blocks_per_page = BLOCKS_PER_PAGE(blksize);
351 nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page);
353 /* define extent + nr_ccws * locate record + nr_ccws * single CCW */
354 cplength = 1 + 2 * nr_ccws;
355 datasize = sizeof(struct DE_fba_data) +
356 nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
358 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
364 define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count);
365 LO_data = cqr->data + sizeof(struct DE_fba_data);
367 /* First part is not aligned. Calculate range to write zeroes. */
368 if (first_rec % blocks_per_page != 0) {
369 wz_stop = first_rec + blocks_per_page -
370 (first_rec % blocks_per_page) - 1;
371 if (wz_stop > last_rec)
373 wz_count = wz_stop - first_rec + 1;
375 ccw[-1].flags |= CCW_FLAG_CC;
376 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
378 ccw[-1].flags |= CCW_FLAG_CC;
379 ccw_write_zero(ccw++, wz_count * blksize);
384 /* We can do proper discard when we've got at least blocks_per_page blocks. */
385 if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
386 /* is last record at page boundary? */
387 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
388 d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
393 d_count = d_stop - (first_rec + cur_pos) + 1;
395 ccw[-1].flags |= CCW_FLAG_CC;
396 locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count);
398 ccw[-1].flags |= CCW_FLAG_CC;
399 ccw_write_no_data(ccw++);
404 /* We might still have some bits left which need to be zeroed. */
405 if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) {
407 wz_count = last_rec - d_stop;
408 else if (wz_stop != 0)
409 wz_count = last_rec - wz_stop;
413 ccw[-1].flags |= CCW_FLAG_CC;
414 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
416 ccw[-1].flags |= CCW_FLAG_CC;
417 ccw_write_zero(ccw++, wz_count * blksize);
420 if (blk_noretry_request(req) ||
421 block->base->features & DASD_FEATURE_FAILFAST)
422 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
424 cqr->startdev = memdev;
425 cqr->memdev = memdev;
427 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
428 cqr->retries = memdev->default_retries;
429 cqr->buildclk = get_tod_clock();
430 cqr->status = DASD_CQR_FILLED;
435 static struct dasd_ccw_req *dasd_fba_build_cp_regular(
436 struct dasd_device *memdev,
437 struct dasd_block *block,
440 struct dasd_fba_private *private = block->base->private;
441 unsigned long *idaws;
442 struct LO_fba_data *LO_data;
443 struct dasd_ccw_req *cqr;
445 struct req_iterator iter;
448 int count, cidaw, cplength, datasize;
449 sector_t recid, first_rec, last_rec;
450 unsigned int blksize, off;
453 if (rq_data_dir(req) == READ) {
454 cmd = DASD_FBA_CCW_READ;
455 } else if (rq_data_dir(req) == WRITE) {
456 cmd = DASD_FBA_CCW_WRITE;
458 return ERR_PTR(-EINVAL);
459 blksize = block->bp_block;
460 /* Calculate record id of first and last block. */
461 first_rec = blk_rq_pos(req) >> block->s2b_shift;
463 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
464 /* Check struct bio and count the number of blocks for the request. */
467 rq_for_each_segment(bv, req, iter) {
468 if (bv.bv_len & (blksize - 1))
469 /* Fba can only do full blocks. */
470 return ERR_PTR(-EINVAL);
471 count += bv.bv_len >> (block->s2b_shift + 9);
472 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
473 cidaw += bv.bv_len / blksize;
476 if (count != last_rec - first_rec + 1)
477 return ERR_PTR(-EINVAL);
478 /* 1x define extent + 1x locate record + number of blocks */
479 cplength = 2 + count;
480 /* 1x define extent + 1x locate record */
481 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
482 cidaw * sizeof(unsigned long);
484 * Find out number of additional locate record ccws if the device
485 * can't do data chaining.
487 if (private->rdc_data.mode.bits.data_chain == 0) {
488 cplength += count - 1;
489 datasize += (count - 1)*sizeof(struct LO_fba_data);
491 /* Allocate the ccw request. */
492 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
496 /* First ccw is define extent. */
497 define_extent(ccw++, cqr->data, rq_data_dir(req),
498 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
499 /* Build locate_record + read/write ccws. */
500 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
501 LO_data = (struct LO_fba_data *) (idaws + cidaw);
502 /* Locate record for all blocks for smart devices. */
503 if (private->rdc_data.mode.bits.data_chain != 0) {
504 ccw[-1].flags |= CCW_FLAG_CC;
505 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
508 rq_for_each_segment(bv, req, iter) {
509 dst = page_address(bv.bv_page) + bv.bv_offset;
510 if (dasd_page_cache) {
511 char *copy = kmem_cache_alloc(dasd_page_cache,
512 GFP_DMA | __GFP_NOWARN);
513 if (copy && rq_data_dir(req) == WRITE)
514 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
516 dst = copy + bv.bv_offset;
518 for (off = 0; off < bv.bv_len; off += blksize) {
519 /* Locate record for stupid devices. */
520 if (private->rdc_data.mode.bits.data_chain == 0) {
521 ccw[-1].flags |= CCW_FLAG_CC;
522 locate_record(ccw, LO_data++,
524 recid - first_rec, 1);
525 ccw->flags = CCW_FLAG_CC;
528 if (recid > first_rec)
529 ccw[-1].flags |= CCW_FLAG_DC;
531 ccw[-1].flags |= CCW_FLAG_CC;
534 ccw->count = block->bp_block;
535 if (idal_is_needed(dst, blksize)) {
536 ccw->cda = (__u32)(addr_t) idaws;
537 ccw->flags = CCW_FLAG_IDA;
538 idaws = idal_create_words(idaws, dst, blksize);
540 ccw->cda = (__u32)(addr_t) dst;
548 if (blk_noretry_request(req) ||
549 block->base->features & DASD_FEATURE_FAILFAST)
550 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
551 cqr->startdev = memdev;
552 cqr->memdev = memdev;
554 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
555 cqr->retries = memdev->default_retries;
556 cqr->buildclk = get_tod_clock();
557 cqr->status = DASD_CQR_FILLED;
561 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev,
562 struct dasd_block *block,
565 if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES)
566 return dasd_fba_build_cp_discard(memdev, block, req);
568 return dasd_fba_build_cp_regular(memdev, block, req);
572 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
574 struct dasd_fba_private *private = cqr->block->base->private;
576 struct req_iterator iter;
579 unsigned int blksize, off;
582 if (!dasd_page_cache)
584 blksize = cqr->block->bp_block;
586 /* Skip over define extent & locate record. */
588 if (private->rdc_data.mode.bits.data_chain != 0)
590 rq_for_each_segment(bv, req, iter) {
591 dst = page_address(bv.bv_page) + bv.bv_offset;
592 for (off = 0; off < bv.bv_len; off += blksize) {
593 /* Skip locate record. */
594 if (private->rdc_data.mode.bits.data_chain == 0)
597 if (ccw->flags & CCW_FLAG_IDA)
598 cda = *((char **)((addr_t) ccw->cda));
600 cda = (char *)((addr_t) ccw->cda);
602 if (rq_data_dir(req) == READ)
603 memcpy(dst, cda, bv.bv_len);
604 kmem_cache_free(dasd_page_cache,
605 (void *)((addr_t)cda & PAGE_MASK));
613 status = cqr->status == DASD_CQR_DONE;
614 dasd_sfree_request(cqr, cqr->memdev);
618 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
620 if (cqr->retries < 0)
621 cqr->status = DASD_CQR_FAILED;
623 cqr->status = DASD_CQR_FILLED;
627 dasd_fba_fill_info(struct dasd_device * device,
628 struct dasd_information2_t * info)
630 struct dasd_fba_private *private = device->private;
632 info->label_block = 1;
633 info->FBA_layout = 1;
634 info->format = DASD_FORMAT_LDL;
635 info->characteristics_size = sizeof(private->rdc_data);
636 memcpy(info->characteristics, &private->rdc_data,
637 sizeof(private->rdc_data));
638 info->confdata_size = 0;
643 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
648 sense = (u64 *) dasd_get_sense(irb);
650 DBF_DEV_EVENT(DBF_EMERG, device,
651 "%s: %s %02x%02x%02x %016llx %016llx %016llx "
653 scsw_is_tm(&irb->scsw) ? "t" : "c",
654 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
655 scsw_dstat(&irb->scsw), sense[0], sense[1],
658 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
659 "SORRY - NO VALID SENSE AVAILABLE\n");
665 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
669 struct ccw1 *act, *end, *last;
670 int len, sl, sct, count;
672 page = (char *) get_zeroed_page(GFP_ATOMIC);
674 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
675 "No memory to dump sense data");
678 len = sprintf(page, PRINTK_HEADER
679 " I/O status report for device %s:\n",
680 dev_name(&device->cdev->dev));
681 len += sprintf(page + len, PRINTK_HEADER
682 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
683 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
684 len += sprintf(page + len, PRINTK_HEADER
685 " device %s: Failing CCW: %p\n",
686 dev_name(&device->cdev->dev),
687 (void *) (addr_t) irb->scsw.cmd.cpa);
688 if (irb->esw.esw0.erw.cons) {
689 for (sl = 0; sl < 4; sl++) {
690 len += sprintf(page + len, PRINTK_HEADER
691 " Sense(hex) %2d-%2d:",
692 (8 * sl), ((8 * sl) + 7));
694 for (sct = 0; sct < 8; sct++) {
695 len += sprintf(page + len, " %02x",
696 irb->ecw[8 * sl + sct]);
698 len += sprintf(page + len, "\n");
701 len += sprintf(page + len, PRINTK_HEADER
702 " SORRY - NO VALID SENSE AVAILABLE\n");
704 printk(KERN_ERR "%s", page);
706 /* dump the Channel Program */
707 /* print first CCWs (maximum 8) */
709 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
710 end = min(act + 8, last);
711 len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
713 len += sprintf(page + len, PRINTK_HEADER
714 " CCW %p: %08X %08X DAT:",
715 act, ((int *) act)[0], ((int *) act)[1]);
716 for (count = 0; count < 32 && count < act->count;
717 count += sizeof(int))
718 len += sprintf(page + len, " %08X",
719 ((int *) (addr_t) act->cda)
721 len += sprintf(page + len, "\n");
724 printk(KERN_ERR "%s", page);
727 /* print failing CCW area */
729 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
730 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
731 len += sprintf(page + len, PRINTK_HEADER "......\n");
733 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
735 len += sprintf(page + len, PRINTK_HEADER
736 " CCW %p: %08X %08X DAT:",
737 act, ((int *) act)[0], ((int *) act)[1]);
738 for (count = 0; count < 32 && count < act->count;
739 count += sizeof(int))
740 len += sprintf(page + len, " %08X",
741 ((int *) (addr_t) act->cda)
743 len += sprintf(page + len, "\n");
747 /* print last CCWs */
748 if (act < last - 2) {
750 len += sprintf(page + len, PRINTK_HEADER "......\n");
752 while (act <= last) {
753 len += sprintf(page + len, PRINTK_HEADER
754 " CCW %p: %08X %08X DAT:",
755 act, ((int *) act)[0], ((int *) act)[1]);
756 for (count = 0; count < 32 && count < act->count;
757 count += sizeof(int))
758 len += sprintf(page + len, " %08X",
759 ((int *) (addr_t) act->cda)
761 len += sprintf(page + len, "\n");
765 printk(KERN_ERR "%s", page);
766 free_page((unsigned long) page);
770 * max_blocks is dependent on the amount of storage that is available
771 * in the static io buffer for each device. Currently each device has
772 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
773 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
774 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
775 * addition we have one define extent ccw + 16 bytes of data and a
776 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
778 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
779 * We want to fit two into the available memory so that we can immediately
780 * start the next request if one finishes off. That makes 100.1 blocks
781 * for one request. Give a little safety and the result is 96.
783 static struct dasd_discipline dasd_fba_discipline = {
784 .owner = THIS_MODULE,
788 .check_device = dasd_fba_check_characteristics,
789 .do_analysis = dasd_fba_do_analysis,
790 .verify_path = dasd_generic_verify_path,
791 .fill_geometry = dasd_fba_fill_geometry,
792 .start_IO = dasd_start_IO,
793 .term_IO = dasd_term_IO,
794 .handle_terminated_request = dasd_fba_handle_terminated_request,
795 .erp_action = dasd_fba_erp_action,
796 .erp_postaction = dasd_fba_erp_postaction,
797 .check_for_device_change = dasd_fba_check_for_device_change,
798 .build_cp = dasd_fba_build_cp,
799 .free_cp = dasd_fba_free_cp,
800 .dump_sense = dasd_fba_dump_sense,
801 .dump_sense_dbf = dasd_fba_dump_sense_dbf,
802 .fill_info = dasd_fba_fill_info,
810 ASCEBC(dasd_fba_discipline.ebcname, 4);
811 ret = ccw_driver_register(&dasd_fba_driver);
813 wait_for_device_probe();
819 dasd_fba_cleanup(void)
821 ccw_driver_unregister(&dasd_fba_driver);
824 module_init(dasd_fba_init);
825 module_exit(dasd_fba_cleanup);