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WIP FPC-III support
[linux/fpc-iii.git] / drivers / s390 / block / dasd_fba.c
blob1aeb68794ce8b980c9c649b7f236852204722696
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Bugreports.to..: <Linux390@de.ibm.com>
5 * Copyright IBM Corp. 1999, 2009
6 */
7
8 #define KMSG_COMPONENT "dasd-fba"
9
10 #include <linux/stddef.h>
11 #include <linux/kernel.h>
12 #include <asm/debug.h>
13
14 #include <linux/slab.h>
15 #include <linux/hdreg.h> /* HDIO_GETGEO */
16 #include <linux/bio.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19
20 #include <asm/idals.h>
21 #include <asm/ebcdic.h>
22 #include <asm/io.h>
23 #include <asm/ccwdev.h>
24
25 #include "dasd_int.h"
26 #include "dasd_fba.h"
27
28 #ifdef PRINTK_HEADER
29 #undef PRINTK_HEADER
30 #endif /* PRINTK_HEADER */
31 #define PRINTK_HEADER "dasd(fba):"
32
33 #define FBA_DEFAULT_RETRIES 32
34
35 #define DASD_FBA_CCW_WRITE 0x41
36 #define DASD_FBA_CCW_READ 0x42
37 #define DASD_FBA_CCW_LOCATE 0x43
38 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
39
40 MODULE_LICENSE("GPL");
41
42 static struct dasd_discipline dasd_fba_discipline;
43 static void *dasd_fba_zero_page;
44
45 struct dasd_fba_private {
46 struct dasd_fba_characteristics rdc_data;
47 };
48
49 static struct ccw_device_id dasd_fba_ids[] = {
50 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
51 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
52 { /* end of list */ },
53 };
54
55 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
56
57 static struct ccw_driver dasd_fba_driver; /* see below */
58 static int
59 dasd_fba_probe(struct ccw_device *cdev)
60 {
61 return dasd_generic_probe(cdev);
62 }
63
64 static int
65 dasd_fba_set_online(struct ccw_device *cdev)
66 {
67 return dasd_generic_set_online(cdev, &dasd_fba_discipline);
68 }
69
70 static struct ccw_driver dasd_fba_driver = {
71 .driver = {
72 .name = "dasd-fba",
73 .owner = THIS_MODULE,
74 },
75 .ids = dasd_fba_ids,
76 .probe = dasd_fba_probe,
77 .remove = dasd_generic_remove,
78 .set_offline = dasd_generic_set_offline,
79 .set_online = dasd_fba_set_online,
80 .notify = dasd_generic_notify,
81 .path_event = dasd_generic_path_event,
82 .int_class = IRQIO_DAS,
83 };
84
85 static void
86 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
87 int blksize, int beg, int nr)
88 {
89 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
90 ccw->flags = 0;
91 ccw->count = 16;
92 ccw->cda = (__u32) __pa(data);
93 memset(data, 0, sizeof (struct DE_fba_data));
94 if (rw == WRITE)
95 (data->mask).perm = 0x0;
96 else if (rw == READ)
97 (data->mask).perm = 0x1;
98 else
99 data->mask.perm = 0x2;
100 data->blk_size = blksize;
101 data->ext_loc = beg;
102 data->ext_end = nr - 1;
103 }
104
105 static void
106 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
107 int block_nr, int block_ct)
108 {
109 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
110 ccw->flags = 0;
111 ccw->count = 8;
112 ccw->cda = (__u32) __pa(data);
113 memset(data, 0, sizeof (struct LO_fba_data));
114 if (rw == WRITE)
115 data->operation.cmd = 0x5;
116 else if (rw == READ)
117 data->operation.cmd = 0x6;
118 else
119 data->operation.cmd = 0x8;
120 data->blk_nr = block_nr;
121 data->blk_ct = block_ct;
122 }
123
124 static int
125 dasd_fba_check_characteristics(struct dasd_device *device)
126 {
127 struct dasd_fba_private *private = device->private;
128 struct ccw_device *cdev = device->cdev;
129 struct dasd_block *block;
130 int readonly, rc;
131
132 if (!private) {
133 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
134 if (!private) {
135 dev_warn(&device->cdev->dev,
136 "Allocating memory for private DASD "
137 "data failed\n");
138 return -ENOMEM;
139 }
140 device->private = private;
141 } else {
142 memset(private, 0, sizeof(*private));
143 }
144 block = dasd_alloc_block();
145 if (IS_ERR(block)) {
146 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
147 "dasd block structure");
148 device->private = NULL;
149 kfree(private);
150 return PTR_ERR(block);
151 }
152 device->block = block;
153 block->base = device;
154
155 /* Read Device Characteristics */
156 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
157 &private->rdc_data, 32);
158 if (rc) {
159 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
160 "characteristics returned error %d", rc);
161 device->block = NULL;
162 dasd_free_block(block);
163 device->private = NULL;
164 kfree(private);
165 return rc;
166 }
167
168 device->default_expires = DASD_EXPIRES;
169 device->default_retries = FBA_DEFAULT_RETRIES;
170 dasd_path_set_opm(device, LPM_ANYPATH);
171
172 readonly = dasd_device_is_ro(device);
173 if (readonly)
174 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
175
176 /* FBA supports discard, set the according feature bit */
177 dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);
178
179 dev_info(&device->cdev->dev,
180 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
181 "and %d B/blk%s\n",
182 cdev->id.dev_type,
183 cdev->id.dev_model,
184 cdev->id.cu_type,
185 cdev->id.cu_model,
186 ((private->rdc_data.blk_bdsa *
187 (private->rdc_data.blk_size >> 9)) >> 11),
188 private->rdc_data.blk_size,
189 readonly ? ", read-only device" : "");
190 return 0;
191 }
192
193 static int dasd_fba_do_analysis(struct dasd_block *block)
194 {
195 struct dasd_fba_private *private = block->base->private;
196 int sb, rc;
197
198 rc = dasd_check_blocksize(private->rdc_data.blk_size);
199 if (rc) {
200 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
201 private->rdc_data.blk_size);
202 return rc;
203 }
204 block->blocks = private->rdc_data.blk_bdsa;
205 block->bp_block = private->rdc_data.blk_size;
206 block->s2b_shift = 0; /* bits to shift 512 to get a block */
207 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
208 block->s2b_shift++;
209 return 0;
210 }
211
212 static int dasd_fba_fill_geometry(struct dasd_block *block,
213 struct hd_geometry *geo)
214 {
215 if (dasd_check_blocksize(block->bp_block) != 0)
216 return -EINVAL;
217 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
218 geo->heads = 16;
219 geo->sectors = 128 >> block->s2b_shift;
220 return 0;
221 }
222
223 static dasd_erp_fn_t
224 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
225 {
226 return dasd_default_erp_action;
227 }
228
229 static dasd_erp_fn_t
230 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
231 {
232 if (cqr->function == dasd_default_erp_action)
233 return dasd_default_erp_postaction;
234
235 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
236 cqr->function);
237 return NULL;
238 }
239
240 static void dasd_fba_check_for_device_change(struct dasd_device *device,
241 struct dasd_ccw_req *cqr,
242 struct irb *irb)
243 {
244 char mask;
245
246 /* first of all check for state change pending interrupt */
247 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
248 if ((irb->scsw.cmd.dstat & mask) == mask)
249 dasd_generic_handle_state_change(device);
250 };
251
252
253 /*
254 * Builds a CCW with no data payload
255 */
256 static void ccw_write_no_data(struct ccw1 *ccw)
257 {
258 ccw->cmd_code = DASD_FBA_CCW_WRITE;
259 ccw->flags |= CCW_FLAG_SLI;
260 ccw->count = 0;
261 }
262
263 /*
264 * Builds a CCW that writes only zeroes.
265 */
266 static void ccw_write_zero(struct ccw1 *ccw, int count)
267 {
268 ccw->cmd_code = DASD_FBA_CCW_WRITE;
269 ccw->flags |= CCW_FLAG_SLI;
270 ccw->count = count;
271 ccw->cda = (__u32) (addr_t) dasd_fba_zero_page;
272 }
273
274 /*
275 * Helper function to count the amount of necessary CCWs within a given range
276 * with 4k alignment and command chaining in mind.
277 */
278 static int count_ccws(sector_t first_rec, sector_t last_rec,
279 unsigned int blocks_per_page)
280 {
281 sector_t wz_stop = 0, d_stop = 0;
282 int cur_pos = 0;
283 int count = 0;
284
285 if (first_rec % blocks_per_page != 0) {
286 wz_stop = first_rec + blocks_per_page -
287 (first_rec % blocks_per_page) - 1;
288 if (wz_stop > last_rec)
289 wz_stop = last_rec;
290 cur_pos = wz_stop - first_rec + 1;
291 count++;
292 }
293
294 if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
295 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
296 d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
297 blocks_per_page);
298 else
299 d_stop = last_rec;
300
301 cur_pos += d_stop - (first_rec + cur_pos) + 1;
302 count++;
303 }
304
305 if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec)
306 count++;
307
308 return count;
309 }
310
311 /*
312 * This function builds a CCW request for block layer discard requests.
313 * Each page in the z/VM hypervisor that represents certain records of an FBA
314 * device will be padded with zeros. This is a special behaviour of the WRITE
315 * command which is triggered when no data payload is added to the CCW.
316 *
317 * Note: Due to issues in some z/VM versions, we can't fully utilise this
318 * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to
319 * work around those issues and write actual zeroes to the unaligned parts in
320 * the request. This workaround might be removed in the future.
321 */
322 static struct dasd_ccw_req *dasd_fba_build_cp_discard(
323 struct dasd_device *memdev,
324 struct dasd_block *block,
325 struct request *req)
326 {
327 struct LO_fba_data *LO_data;
328 struct dasd_ccw_req *cqr;
329 struct ccw1 *ccw;
330
331 sector_t wz_stop = 0, d_stop = 0;
332 sector_t first_rec, last_rec;
333
334 unsigned int blksize = block->bp_block;
335 unsigned int blocks_per_page;
336 int wz_count = 0;
337 int d_count = 0;
338 int cur_pos = 0; /* Current position within the extent */
339 int count = 0;
340 int cplength;
341 int datasize;
342 int nr_ccws;
343
344 first_rec = blk_rq_pos(req) >> block->s2b_shift;
345 last_rec =
346 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
347 count = last_rec - first_rec + 1;
348
349 blocks_per_page = BLOCKS_PER_PAGE(blksize);
350 nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page);
351
352 /* define extent + nr_ccws * locate record + nr_ccws * single CCW */
353 cplength = 1 + 2 * nr_ccws;
354 datasize = sizeof(struct DE_fba_data) +
355 nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
356
357 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
358 blk_mq_rq_to_pdu(req));
359 if (IS_ERR(cqr))
360 return cqr;
361
362 ccw = cqr->cpaddr;
363
364 define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count);
365 LO_data = cqr->data + sizeof(struct DE_fba_data);
366
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)
372 wz_stop = last_rec;
373 wz_count = wz_stop - first_rec + 1;
374
375 ccw[-1].flags |= CCW_FLAG_CC;
376 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
377
378 ccw[-1].flags |= CCW_FLAG_CC;
379 ccw_write_zero(ccw++, wz_count * blksize);
380
381 cur_pos = wz_count;
382 }
383
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) %
389 blocks_per_page);
390 else
391 d_stop = last_rec;
392
393 d_count = d_stop - (first_rec + cur_pos) + 1;
394
395 ccw[-1].flags |= CCW_FLAG_CC;
396 locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count);
397
398 ccw[-1].flags |= CCW_FLAG_CC;
399 ccw_write_no_data(ccw++);
400
401 cur_pos += d_count;
402 }
403
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) {
406 if (d_stop != 0)
407 wz_count = last_rec - d_stop;
408 else if (wz_stop != 0)
409 wz_count = last_rec - wz_stop;
410 else
411 wz_count = count;
412
413 ccw[-1].flags |= CCW_FLAG_CC;
414 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
415
416 ccw[-1].flags |= CCW_FLAG_CC;
417 ccw_write_zero(ccw++, wz_count * blksize);
418 }
419
420 if (blk_noretry_request(req) ||
421 block->base->features & DASD_FEATURE_FAILFAST)
422 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
423
424 cqr->startdev = memdev;
425 cqr->memdev = memdev;
426 cqr->block = block;
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;
431
432 return cqr;
433 }
434
435 static struct dasd_ccw_req *dasd_fba_build_cp_regular(
436 struct dasd_device *memdev,
437 struct dasd_block *block,
438 struct request *req)
439 {
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;
444 struct ccw1 *ccw;
445 struct req_iterator iter;
446 struct bio_vec bv;
447 char *dst;
448 int count, cidaw, cplength, datasize;
449 sector_t recid, first_rec, last_rec;
450 unsigned int blksize, off;
451 unsigned char cmd;
452
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;
457 } else
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;
462 last_rec =
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. */
465 count = 0;
466 cidaw = 0;
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;
474 }
475 /* Paranoia. */
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);
483 /*
484 * Find out number of additional locate record ccws if the device
485 * can't do data chaining.
486 */
487 if (private->rdc_data.mode.bits.data_chain == 0) {
488 cplength += count - 1;
489 datasize += (count - 1)*sizeof(struct LO_fba_data);
490 }
491 /* Allocate the ccw request. */
492 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
493 blk_mq_rq_to_pdu(req));
494 if (IS_ERR(cqr))
495 return cqr;
496 ccw = cqr->cpaddr;
497 /* First ccw is define extent. */
498 define_extent(ccw++, cqr->data, rq_data_dir(req),
499 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
500 /* Build locate_record + read/write ccws. */
501 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
502 LO_data = (struct LO_fba_data *) (idaws + cidaw);
503 /* Locate record for all blocks for smart devices. */
504 if (private->rdc_data.mode.bits.data_chain != 0) {
505 ccw[-1].flags |= CCW_FLAG_CC;
506 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
507 }
508 recid = first_rec;
509 rq_for_each_segment(bv, req, iter) {
510 dst = page_address(bv.bv_page) + bv.bv_offset;
511 if (dasd_page_cache) {
512 char *copy = kmem_cache_alloc(dasd_page_cache,
513 GFP_DMA | __GFP_NOWARN);
514 if (copy && rq_data_dir(req) == WRITE)
515 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
516 if (copy)
517 dst = copy + bv.bv_offset;
518 }
519 for (off = 0; off < bv.bv_len; off += blksize) {
520 /* Locate record for stupid devices. */
521 if (private->rdc_data.mode.bits.data_chain == 0) {
522 ccw[-1].flags |= CCW_FLAG_CC;
523 locate_record(ccw, LO_data++,
524 rq_data_dir(req),
525 recid - first_rec, 1);
526 ccw->flags = CCW_FLAG_CC;
527 ccw++;
528 } else {
529 if (recid > first_rec)
530 ccw[-1].flags |= CCW_FLAG_DC;
531 else
532 ccw[-1].flags |= CCW_FLAG_CC;
533 }
534 ccw->cmd_code = cmd;
535 ccw->count = block->bp_block;
536 if (idal_is_needed(dst, blksize)) {
537 ccw->cda = (__u32)(addr_t) idaws;
538 ccw->flags = CCW_FLAG_IDA;
539 idaws = idal_create_words(idaws, dst, blksize);
540 } else {
541 ccw->cda = (__u32)(addr_t) dst;
542 ccw->flags = 0;
543 }
544 ccw++;
545 dst += blksize;
546 recid++;
547 }
548 }
549 if (blk_noretry_request(req) ||
550 block->base->features & DASD_FEATURE_FAILFAST)
551 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
552 cqr->startdev = memdev;
553 cqr->memdev = memdev;
554 cqr->block = block;
555 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
556 cqr->retries = memdev->default_retries;
557 cqr->buildclk = get_tod_clock();
558 cqr->status = DASD_CQR_FILLED;
559 return cqr;
560 }
561
562 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev,
563 struct dasd_block *block,
564 struct request *req)
565 {
566 if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES)
567 return dasd_fba_build_cp_discard(memdev, block, req);
568 else
569 return dasd_fba_build_cp_regular(memdev, block, req);
570 }
571
572 static int
573 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
574 {
575 struct dasd_fba_private *private = cqr->block->base->private;
576 struct ccw1 *ccw;
577 struct req_iterator iter;
578 struct bio_vec bv;
579 char *dst, *cda;
580 unsigned int blksize, off;
581 int status;
582
583 if (!dasd_page_cache)
584 goto out;
585 blksize = cqr->block->bp_block;
586 ccw = cqr->cpaddr;
587 /* Skip over define extent & locate record. */
588 ccw++;
589 if (private->rdc_data.mode.bits.data_chain != 0)
590 ccw++;
591 rq_for_each_segment(bv, req, iter) {
592 dst = page_address(bv.bv_page) + bv.bv_offset;
593 for (off = 0; off < bv.bv_len; off += blksize) {
594 /* Skip locate record. */
595 if (private->rdc_data.mode.bits.data_chain == 0)
596 ccw++;
597 if (dst) {
598 if (ccw->flags & CCW_FLAG_IDA)
599 cda = *((char **)((addr_t) ccw->cda));
600 else
601 cda = (char *)((addr_t) ccw->cda);
602 if (dst != cda) {
603 if (rq_data_dir(req) == READ)
604 memcpy(dst, cda, bv.bv_len);
605 kmem_cache_free(dasd_page_cache,
606 (void *)((addr_t)cda & PAGE_MASK));
607 }
608 dst = NULL;
609 }
610 ccw++;
611 }
612 }
613 out:
614 status = cqr->status == DASD_CQR_DONE;
615 dasd_sfree_request(cqr, cqr->memdev);
616 return status;
617 }
618
619 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
620 {
621 if (cqr->retries < 0)
622 cqr->status = DASD_CQR_FAILED;
623 else
624 cqr->status = DASD_CQR_FILLED;
625 };
626
627 static int
628 dasd_fba_fill_info(struct dasd_device * device,
629 struct dasd_information2_t * info)
630 {
631 struct dasd_fba_private *private = device->private;
632
633 info->label_block = 1;
634 info->FBA_layout = 1;
635 info->format = DASD_FORMAT_LDL;
636 info->characteristics_size = sizeof(private->rdc_data);
637 memcpy(info->characteristics, &private->rdc_data,
638 sizeof(private->rdc_data));
639 info->confdata_size = 0;
640 return 0;
641 }
642
643 static void
644 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
645 char *reason)
646 {
647 u64 *sense;
648
649 sense = (u64 *) dasd_get_sense(irb);
650 if (sense) {
651 DBF_DEV_EVENT(DBF_EMERG, device,
652 "%s: %s %02x%02x%02x %016llx %016llx %016llx "
653 "%016llx", reason,
654 scsw_is_tm(&irb->scsw) ? "t" : "c",
655 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
656 scsw_dstat(&irb->scsw), sense[0], sense[1],
657 sense[2], sense[3]);
658 } else {
659 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
660 "SORRY - NO VALID SENSE AVAILABLE\n");
661 }
662 }
663
664
665 static void
666 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
667 struct irb *irb)
668 {
669 char *page;
670 struct ccw1 *act, *end, *last;
671 int len, sl, sct, count;
672
673 page = (char *) get_zeroed_page(GFP_ATOMIC);
674 if (page == NULL) {
675 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
676 "No memory to dump sense data");
677 return;
678 }
679 len = sprintf(page, PRINTK_HEADER
680 " I/O status report for device %s:\n",
681 dev_name(&device->cdev->dev));
682 len += sprintf(page + len, PRINTK_HEADER
683 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
684 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
685 len += sprintf(page + len, PRINTK_HEADER
686 " device %s: Failing CCW: %p\n",
687 dev_name(&device->cdev->dev),
688 (void *) (addr_t) irb->scsw.cmd.cpa);
689 if (irb->esw.esw0.erw.cons) {
690 for (sl = 0; sl < 4; sl++) {
691 len += sprintf(page + len, PRINTK_HEADER
692 " Sense(hex) %2d-%2d:",
693 (8 * sl), ((8 * sl) + 7));
694
695 for (sct = 0; sct < 8; sct++) {
696 len += sprintf(page + len, " %02x",
697 irb->ecw[8 * sl + sct]);
698 }
699 len += sprintf(page + len, "\n");
700 }
701 } else {
702 len += sprintf(page + len, PRINTK_HEADER
703 " SORRY - NO VALID SENSE AVAILABLE\n");
704 }
705 printk(KERN_ERR "%s", page);
706
707 /* dump the Channel Program */
708 /* print first CCWs (maximum 8) */
709 act = req->cpaddr;
710 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
711 end = min(act + 8, last);
712 len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
713 while (act <= end) {
714 len += sprintf(page + len, PRINTK_HEADER
715 " CCW %p: %08X %08X DAT:",
716 act, ((int *) act)[0], ((int *) act)[1]);
717 for (count = 0; count < 32 && count < act->count;
718 count += sizeof(int))
719 len += sprintf(page + len, " %08X",
720 ((int *) (addr_t) act->cda)
721 [(count>>2)]);
722 len += sprintf(page + len, "\n");
723 act++;
724 }
725 printk(KERN_ERR "%s", page);
726
727
728 /* print failing CCW area */
729 len = 0;
730 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
731 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
732 len += sprintf(page + len, PRINTK_HEADER "......\n");
733 }
734 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
735 while (act <= end) {
736 len += sprintf(page + len, PRINTK_HEADER
737 " CCW %p: %08X %08X DAT:",
738 act, ((int *) act)[0], ((int *) act)[1]);
739 for (count = 0; count < 32 && count < act->count;
740 count += sizeof(int))
741 len += sprintf(page + len, " %08X",
742 ((int *) (addr_t) act->cda)
743 [(count>>2)]);
744 len += sprintf(page + len, "\n");
745 act++;
746 }
747
748 /* print last CCWs */
749 if (act < last - 2) {
750 act = last - 2;
751 len += sprintf(page + len, PRINTK_HEADER "......\n");
752 }
753 while (act <= last) {
754 len += sprintf(page + len, PRINTK_HEADER
755 " CCW %p: %08X %08X DAT:",
756 act, ((int *) act)[0], ((int *) act)[1]);
757 for (count = 0; count < 32 && count < act->count;
758 count += sizeof(int))
759 len += sprintf(page + len, " %08X",
760 ((int *) (addr_t) act->cda)
761 [(count>>2)]);
762 len += sprintf(page + len, "\n");
763 act++;
764 }
765 if (len > 0)
766 printk(KERN_ERR "%s", page);
767 free_page((unsigned long) page);
768 }
769
770 /*
771 * Initialize block layer request queue.
772 */
773 static void dasd_fba_setup_blk_queue(struct dasd_block *block)
774 {
775 unsigned int logical_block_size = block->bp_block;
776 struct request_queue *q = block->request_queue;
777 unsigned int max_bytes, max_discard_sectors;
778 int max;
779
780 max = DASD_FBA_MAX_BLOCKS << block->s2b_shift;
781 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
782 q->limits.max_dev_sectors = max;
783 blk_queue_logical_block_size(q, logical_block_size);
784 blk_queue_max_hw_sectors(q, max);
785 blk_queue_max_segments(q, USHRT_MAX);
786 /* With page sized segments each segment can be translated into one idaw/tidaw */
787 blk_queue_max_segment_size(q, PAGE_SIZE);
788 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
789
790 q->limits.discard_granularity = logical_block_size;
791 q->limits.discard_alignment = PAGE_SIZE;
792
793 /* Calculate max_discard_sectors and make it PAGE aligned */
794 max_bytes = USHRT_MAX * logical_block_size;
795 max_bytes = ALIGN_DOWN(max_bytes, PAGE_SIZE);
796 max_discard_sectors = max_bytes / logical_block_size;
797
798 blk_queue_max_discard_sectors(q, max_discard_sectors);
799 blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
800 blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
801 }
802
803 static struct dasd_discipline dasd_fba_discipline = {
804 .owner = THIS_MODULE,
805 .name = "FBA ",
806 .ebcname = "FBA ",
807 .check_device = dasd_fba_check_characteristics,
808 .do_analysis = dasd_fba_do_analysis,
809 .verify_path = dasd_generic_verify_path,
810 .setup_blk_queue = dasd_fba_setup_blk_queue,
811 .fill_geometry = dasd_fba_fill_geometry,
812 .start_IO = dasd_start_IO,
813 .term_IO = dasd_term_IO,
814 .handle_terminated_request = dasd_fba_handle_terminated_request,
815 .erp_action = dasd_fba_erp_action,
816 .erp_postaction = dasd_fba_erp_postaction,
817 .check_for_device_change = dasd_fba_check_for_device_change,
818 .build_cp = dasd_fba_build_cp,
819 .free_cp = dasd_fba_free_cp,
820 .dump_sense = dasd_fba_dump_sense,
821 .dump_sense_dbf = dasd_fba_dump_sense_dbf,
822 .fill_info = dasd_fba_fill_info,
823 };
824
825 static int __init
826 dasd_fba_init(void)
827 {
828 int ret;
829
830 ASCEBC(dasd_fba_discipline.ebcname, 4);
831
832 dasd_fba_zero_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
833 if (!dasd_fba_zero_page)
834 return -ENOMEM;
835
836 ret = ccw_driver_register(&dasd_fba_driver);
837 if (!ret)
838 wait_for_device_probe();
839
840 return ret;
841 }
842
843 static void __exit
844 dasd_fba_cleanup(void)
845 {
846 ccw_driver_unregister(&dasd_fba_driver);
847 free_page((unsigned long)dasd_fba_zero_page);
848 }
849
850 module_init(dasd_fba_init);
851 module_exit(dasd_fba_cleanup);
Linux with added FPC-III support