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 #include <linux/io.h>
20
21 #include <asm/idals.h>
22 #include <asm/ebcdic.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 int
dasd_fba_set_online(struct ccw_device * cdev)58 dasd_fba_set_online(struct ccw_device *cdev)
59 {
60 return dasd_generic_set_online(cdev, &dasd_fba_discipline);
61 }
62
63 static struct ccw_driver dasd_fba_driver = {
64 .driver = {
65 .name = "dasd-fba",
66 .owner = THIS_MODULE,
67 .dev_groups = dasd_dev_groups,
68 },
69 .ids = dasd_fba_ids,
70 .probe = dasd_generic_probe,
71 .remove = dasd_generic_remove,
72 .set_offline = dasd_generic_set_offline,
73 .set_online = dasd_fba_set_online,
74 .notify = dasd_generic_notify,
75 .path_event = dasd_generic_path_event,
76 .int_class = IRQIO_DAS,
77 };
78
79 static void
define_extent(struct ccw1 * ccw,struct DE_fba_data * data,int rw,int blksize,int beg,int nr)80 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
81 int blksize, int beg, int nr)
82 {
83 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
84 ccw->flags = 0;
85 ccw->count = 16;
86 ccw->cda = (__u32)virt_to_phys(data);
87 memset(data, 0, sizeof (struct DE_fba_data));
88 if (rw == WRITE)
89 (data->mask).perm = 0x0;
90 else if (rw == READ)
91 (data->mask).perm = 0x1;
92 else
93 data->mask.perm = 0x2;
94 data->blk_size = blksize;
95 data->ext_loc = beg;
96 data->ext_end = nr - 1;
97 }
98
99 static void
locate_record(struct ccw1 * ccw,struct LO_fba_data * data,int rw,int block_nr,int block_ct)100 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
101 int block_nr, int block_ct)
102 {
103 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
104 ccw->flags = 0;
105 ccw->count = 8;
106 ccw->cda = (__u32)virt_to_phys(data);
107 memset(data, 0, sizeof (struct LO_fba_data));
108 if (rw == WRITE)
109 data->operation.cmd = 0x5;
110 else if (rw == READ)
111 data->operation.cmd = 0x6;
112 else
113 data->operation.cmd = 0x8;
114 data->blk_nr = block_nr;
115 data->blk_ct = block_ct;
116 }
117
118 static int
dasd_fba_check_characteristics(struct dasd_device * device)119 dasd_fba_check_characteristics(struct dasd_device *device)
120 {
121 struct dasd_fba_private *private = device->private;
122 struct ccw_device *cdev = device->cdev;
123 struct dasd_block *block;
124 int readonly, rc;
125
126 if (!private) {
127 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
128 if (!private) {
129 dev_warn(&device->cdev->dev,
130 "Allocating memory for private DASD "
131 "data failed\n");
132 return -ENOMEM;
133 }
134 device->private = private;
135 } else {
136 memset(private, 0, sizeof(*private));
137 }
138 block = dasd_alloc_block();
139 if (IS_ERR(block)) {
140 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
141 "dasd block structure");
142 device->private = NULL;
143 kfree(private);
144 return PTR_ERR(block);
145 }
146 device->block = block;
147 block->base = device;
148
149 /* Read Device Characteristics */
150 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
151 &private->rdc_data, 32);
152 if (rc) {
153 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
154 "characteristics returned error %d", rc);
155 device->block = NULL;
156 dasd_free_block(block);
157 device->private = NULL;
158 kfree(private);
159 return rc;
160 }
161
162 device->default_expires = DASD_EXPIRES;
163 device->default_retries = FBA_DEFAULT_RETRIES;
164 dasd_path_set_opm(device, LPM_ANYPATH);
165
166 readonly = dasd_device_is_ro(device);
167 if (readonly)
168 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
169
170 /* FBA supports discard, set the according feature bit */
171 dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);
172
173 dev_info(&device->cdev->dev,
174 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
175 "and %d B/blk%s\n",
176 cdev->id.dev_type,
177 cdev->id.dev_model,
178 cdev->id.cu_type,
179 cdev->id.cu_model,
180 ((private->rdc_data.blk_bdsa *
181 (private->rdc_data.blk_size >> 9)) >> 11),
182 private->rdc_data.blk_size,
183 readonly ? ", read-only device" : "");
184 return 0;
185 }
186
dasd_fba_do_analysis(struct dasd_block * block)187 static int dasd_fba_do_analysis(struct dasd_block *block)
188 {
189 struct dasd_fba_private *private = block->base->private;
190 int sb, rc;
191
192 rc = dasd_check_blocksize(private->rdc_data.blk_size);
193 if (rc) {
194 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
195 private->rdc_data.blk_size);
196 return rc;
197 }
198 block->blocks = private->rdc_data.blk_bdsa;
199 block->bp_block = private->rdc_data.blk_size;
200 block->s2b_shift = 0; /* bits to shift 512 to get a block */
201 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
202 block->s2b_shift++;
203 return 0;
204 }
205
dasd_fba_fill_geometry(struct dasd_block * block,struct hd_geometry * geo)206 static int dasd_fba_fill_geometry(struct dasd_block *block,
207 struct hd_geometry *geo)
208 {
209 if (dasd_check_blocksize(block->bp_block) != 0)
210 return -EINVAL;
211 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
212 geo->heads = 16;
213 geo->sectors = 128 >> block->s2b_shift;
214 return 0;
215 }
216
217 static dasd_erp_fn_t
dasd_fba_erp_action(struct dasd_ccw_req * cqr)218 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
219 {
220 return dasd_default_erp_action;
221 }
222
223 static dasd_erp_fn_t
dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)224 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
225 {
226 if (cqr->function == dasd_default_erp_action)
227 return dasd_default_erp_postaction;
228
229 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
230 cqr->function);
231 return NULL;
232 }
233
dasd_fba_check_for_device_change(struct dasd_device * device,struct dasd_ccw_req * cqr,struct irb * irb)234 static void dasd_fba_check_for_device_change(struct dasd_device *device,
235 struct dasd_ccw_req *cqr,
236 struct irb *irb)
237 {
238 char mask;
239
240 /* first of all check for state change pending interrupt */
241 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
242 if ((irb->scsw.cmd.dstat & mask) == mask)
243 dasd_generic_handle_state_change(device);
244 };
245
246
247 /*
248 * Builds a CCW with no data payload
249 */
ccw_write_no_data(struct ccw1 * ccw)250 static void ccw_write_no_data(struct ccw1 *ccw)
251 {
252 ccw->cmd_code = DASD_FBA_CCW_WRITE;
253 ccw->flags |= CCW_FLAG_SLI;
254 ccw->count = 0;
255 }
256
257 /*
258 * Builds a CCW that writes only zeroes.
259 */
ccw_write_zero(struct ccw1 * ccw,int count)260 static void ccw_write_zero(struct ccw1 *ccw, int count)
261 {
262 ccw->cmd_code = DASD_FBA_CCW_WRITE;
263 ccw->flags |= CCW_FLAG_SLI;
264 ccw->count = count;
265 ccw->cda = (__u32)virt_to_phys(dasd_fba_zero_page);
266 }
267
268 /*
269 * Helper function to count the amount of necessary CCWs within a given range
270 * with 4k alignment and command chaining in mind.
271 */
count_ccws(sector_t first_rec,sector_t last_rec,unsigned int blocks_per_page)272 static int count_ccws(sector_t first_rec, sector_t last_rec,
273 unsigned int blocks_per_page)
274 {
275 sector_t wz_stop = 0, d_stop = 0;
276 int cur_pos = 0;
277 int count = 0;
278
279 if (first_rec % blocks_per_page != 0) {
280 wz_stop = first_rec + blocks_per_page -
281 (first_rec % blocks_per_page) - 1;
282 if (wz_stop > last_rec)
283 wz_stop = last_rec;
284 cur_pos = wz_stop - first_rec + 1;
285 count++;
286 }
287
288 if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
289 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
290 d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
291 blocks_per_page);
292 else
293 d_stop = last_rec;
294
295 cur_pos += d_stop - (first_rec + cur_pos) + 1;
296 count++;
297 }
298
299 if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec)
300 count++;
301
302 return count;
303 }
304
305 /*
306 * This function builds a CCW request for block layer discard requests.
307 * Each page in the z/VM hypervisor that represents certain records of an FBA
308 * device will be padded with zeros. This is a special behaviour of the WRITE
309 * command which is triggered when no data payload is added to the CCW.
310 *
311 * Note: Due to issues in some z/VM versions, we can't fully utilise this
312 * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to
313 * work around those issues and write actual zeroes to the unaligned parts in
314 * the request. This workaround might be removed in the future.
315 */
dasd_fba_build_cp_discard(struct dasd_device * memdev,struct dasd_block * block,struct request * req)316 static struct dasd_ccw_req *dasd_fba_build_cp_discard(
317 struct dasd_device *memdev,
318 struct dasd_block *block,
319 struct request *req)
320 {
321 struct LO_fba_data *LO_data;
322 struct dasd_ccw_req *cqr;
323 struct ccw1 *ccw;
324
325 sector_t wz_stop = 0, d_stop = 0;
326 sector_t first_rec, last_rec;
327
328 unsigned int blksize = block->bp_block;
329 unsigned int blocks_per_page;
330 int wz_count = 0;
331 int d_count = 0;
332 int cur_pos = 0; /* Current position within the extent */
333 int count = 0;
334 int cplength;
335 int datasize;
336 int nr_ccws;
337
338 first_rec = blk_rq_pos(req) >> block->s2b_shift;
339 last_rec =
340 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
341 count = last_rec - first_rec + 1;
342
343 blocks_per_page = BLOCKS_PER_PAGE(blksize);
344 nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page);
345
346 /* define extent + nr_ccws * locate record + nr_ccws * single CCW */
347 cplength = 1 + 2 * nr_ccws;
348 datasize = sizeof(struct DE_fba_data) +
349 nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
350
351 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
352 blk_mq_rq_to_pdu(req));
353 if (IS_ERR(cqr))
354 return cqr;
355
356 ccw = cqr->cpaddr;
357
358 define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count);
359 LO_data = cqr->data + sizeof(struct DE_fba_data);
360
361 /* First part is not aligned. Calculate range to write zeroes. */
362 if (first_rec % blocks_per_page != 0) {
363 wz_stop = first_rec + blocks_per_page -
364 (first_rec % blocks_per_page) - 1;
365 if (wz_stop > last_rec)
366 wz_stop = last_rec;
367 wz_count = wz_stop - first_rec + 1;
368
369 ccw[-1].flags |= CCW_FLAG_CC;
370 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
371
372 ccw[-1].flags |= CCW_FLAG_CC;
373 ccw_write_zero(ccw++, wz_count * blksize);
374
375 cur_pos = wz_count;
376 }
377
378 /* We can do proper discard when we've got at least blocks_per_page blocks. */
379 if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
380 /* is last record at page boundary? */
381 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
382 d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
383 blocks_per_page);
384 else
385 d_stop = last_rec;
386
387 d_count = d_stop - (first_rec + cur_pos) + 1;
388
389 ccw[-1].flags |= CCW_FLAG_CC;
390 locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count);
391
392 ccw[-1].flags |= CCW_FLAG_CC;
393 ccw_write_no_data(ccw++);
394
395 cur_pos += d_count;
396 }
397
398 /* We might still have some bits left which need to be zeroed. */
399 if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) {
400 if (d_stop != 0)
401 wz_count = last_rec - d_stop;
402 else if (wz_stop != 0)
403 wz_count = last_rec - wz_stop;
404 else
405 wz_count = count;
406
407 ccw[-1].flags |= CCW_FLAG_CC;
408 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
409
410 ccw[-1].flags |= CCW_FLAG_CC;
411 ccw_write_zero(ccw++, wz_count * blksize);
412 }
413
414 if (blk_noretry_request(req) ||
415 block->base->features & DASD_FEATURE_FAILFAST)
416 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
417
418 cqr->startdev = memdev;
419 cqr->memdev = memdev;
420 cqr->block = block;
421 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
422 cqr->retries = memdev->default_retries;
423 cqr->buildclk = get_tod_clock();
424 cqr->status = DASD_CQR_FILLED;
425
426 return cqr;
427 }
428
dasd_fba_build_cp_regular(struct dasd_device * memdev,struct dasd_block * block,struct request * req)429 static struct dasd_ccw_req *dasd_fba_build_cp_regular(
430 struct dasd_device *memdev,
431 struct dasd_block *block,
432 struct request *req)
433 {
434 struct dasd_fba_private *private = block->base->private;
435 unsigned long *idaws;
436 struct LO_fba_data *LO_data;
437 struct dasd_ccw_req *cqr;
438 struct ccw1 *ccw;
439 struct req_iterator iter;
440 struct bio_vec bv;
441 char *dst;
442 int count, cidaw, cplength, datasize;
443 sector_t recid, first_rec, last_rec;
444 unsigned int blksize, off;
445 unsigned char cmd;
446
447 if (rq_data_dir(req) == READ) {
448 cmd = DASD_FBA_CCW_READ;
449 } else if (rq_data_dir(req) == WRITE) {
450 cmd = DASD_FBA_CCW_WRITE;
451 } else
452 return ERR_PTR(-EINVAL);
453 blksize = block->bp_block;
454 /* Calculate record id of first and last block. */
455 first_rec = blk_rq_pos(req) >> block->s2b_shift;
456 last_rec =
457 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
458 /* Check struct bio and count the number of blocks for the request. */
459 count = 0;
460 cidaw = 0;
461 rq_for_each_segment(bv, req, iter) {
462 if (bv.bv_len & (blksize - 1))
463 /* Fba can only do full blocks. */
464 return ERR_PTR(-EINVAL);
465 count += bv.bv_len >> (block->s2b_shift + 9);
466 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
467 cidaw += bv.bv_len / blksize;
468 }
469 /* Paranoia. */
470 if (count != last_rec - first_rec + 1)
471 return ERR_PTR(-EINVAL);
472 /* 1x define extent + 1x locate record + number of blocks */
473 cplength = 2 + count;
474 /* 1x define extent + 1x locate record */
475 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
476 cidaw * sizeof(unsigned long);
477 /*
478 * Find out number of additional locate record ccws if the device
479 * can't do data chaining.
480 */
481 if (private->rdc_data.mode.bits.data_chain == 0) {
482 cplength += count - 1;
483 datasize += (count - 1)*sizeof(struct LO_fba_data);
484 }
485 /* Allocate the ccw request. */
486 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
487 blk_mq_rq_to_pdu(req));
488 if (IS_ERR(cqr))
489 return cqr;
490 ccw = cqr->cpaddr;
491 /* First ccw is define extent. */
492 define_extent(ccw++, cqr->data, rq_data_dir(req),
493 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
494 /* Build locate_record + read/write ccws. */
495 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
496 LO_data = (struct LO_fba_data *) (idaws + cidaw);
497 /* Locate record for all blocks for smart devices. */
498 if (private->rdc_data.mode.bits.data_chain != 0) {
499 ccw[-1].flags |= CCW_FLAG_CC;
500 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
501 }
502 recid = first_rec;
503 rq_for_each_segment(bv, req, iter) {
504 dst = bvec_virt(&bv);
505 if (dasd_page_cache) {
506 char *copy = kmem_cache_alloc(dasd_page_cache,
507 GFP_DMA | __GFP_NOWARN);
508 if (copy && rq_data_dir(req) == WRITE)
509 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
510 if (copy)
511 dst = copy + bv.bv_offset;
512 }
513 for (off = 0; off < bv.bv_len; off += blksize) {
514 /* Locate record for stupid devices. */
515 if (private->rdc_data.mode.bits.data_chain == 0) {
516 ccw[-1].flags |= CCW_FLAG_CC;
517 locate_record(ccw, LO_data++,
518 rq_data_dir(req),
519 recid - first_rec, 1);
520 ccw->flags = CCW_FLAG_CC;
521 ccw++;
522 } else {
523 if (recid > first_rec)
524 ccw[-1].flags |= CCW_FLAG_DC;
525 else
526 ccw[-1].flags |= CCW_FLAG_CC;
527 }
528 ccw->cmd_code = cmd;
529 ccw->count = block->bp_block;
530 if (idal_is_needed(dst, blksize)) {
531 ccw->cda = (__u32)virt_to_phys(idaws);
532 ccw->flags = CCW_FLAG_IDA;
533 idaws = idal_create_words(idaws, dst, blksize);
534 } else {
535 ccw->cda = (__u32)virt_to_phys(dst);
536 ccw->flags = 0;
537 }
538 ccw++;
539 dst += blksize;
540 recid++;
541 }
542 }
543 if (blk_noretry_request(req) ||
544 block->base->features & DASD_FEATURE_FAILFAST)
545 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
546 cqr->startdev = memdev;
547 cqr->memdev = memdev;
548 cqr->block = block;
549 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
550 cqr->retries = memdev->default_retries;
551 cqr->buildclk = get_tod_clock();
552 cqr->status = DASD_CQR_FILLED;
553 return cqr;
554 }
555
dasd_fba_build_cp(struct dasd_device * memdev,struct dasd_block * block,struct request * req)556 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev,
557 struct dasd_block *block,
558 struct request *req)
559 {
560 if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES)
561 return dasd_fba_build_cp_discard(memdev, block, req);
562 else
563 return dasd_fba_build_cp_regular(memdev, block, req);
564 }
565
566 static int
dasd_fba_free_cp(struct dasd_ccw_req * cqr,struct request * req)567 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
568 {
569 struct dasd_fba_private *private = cqr->block->base->private;
570 struct ccw1 *ccw;
571 struct req_iterator iter;
572 struct bio_vec bv;
573 char *dst, *cda;
574 unsigned int blksize, off;
575 int status;
576
577 if (!dasd_page_cache)
578 goto out;
579 blksize = cqr->block->bp_block;
580 ccw = cqr->cpaddr;
581 /* Skip over define extent & locate record. */
582 ccw++;
583 if (private->rdc_data.mode.bits.data_chain != 0)
584 ccw++;
585 rq_for_each_segment(bv, req, iter) {
586 dst = bvec_virt(&bv);
587 for (off = 0; off < bv.bv_len; off += blksize) {
588 /* Skip locate record. */
589 if (private->rdc_data.mode.bits.data_chain == 0)
590 ccw++;
591 if (dst) {
592 if (ccw->flags & CCW_FLAG_IDA)
593 cda = *((char **)phys_to_virt(ccw->cda));
594 else
595 cda = phys_to_virt(ccw->cda);
596 if (dst != cda) {
597 if (rq_data_dir(req) == READ)
598 memcpy(dst, cda, bv.bv_len);
599 kmem_cache_free(dasd_page_cache,
600 (void *)((addr_t)cda & PAGE_MASK));
601 }
602 dst = NULL;
603 }
604 ccw++;
605 }
606 }
607 out:
608 status = cqr->status == DASD_CQR_DONE;
609 dasd_sfree_request(cqr, cqr->memdev);
610 return status;
611 }
612
dasd_fba_handle_terminated_request(struct dasd_ccw_req * cqr)613 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
614 {
615 if (cqr->retries < 0)
616 cqr->status = DASD_CQR_FAILED;
617 else
618 cqr->status = DASD_CQR_FILLED;
619 };
620
621 static int
dasd_fba_fill_info(struct dasd_device * device,struct dasd_information2_t * info)622 dasd_fba_fill_info(struct dasd_device * device,
623 struct dasd_information2_t * info)
624 {
625 struct dasd_fba_private *private = device->private;
626
627 info->label_block = 1;
628 info->FBA_layout = 1;
629 info->format = DASD_FORMAT_LDL;
630 info->characteristics_size = sizeof(private->rdc_data);
631 memcpy(info->characteristics, &private->rdc_data,
632 sizeof(private->rdc_data));
633 info->confdata_size = 0;
634 return 0;
635 }
636
637 static void
dasd_fba_dump_sense_dbf(struct dasd_device * device,struct irb * irb,char * reason)638 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
639 char *reason)
640 {
641 u64 *sense;
642
643 sense = (u64 *) dasd_get_sense(irb);
644 if (sense) {
645 DBF_DEV_EVENT(DBF_EMERG, device,
646 "%s: %s %02x%02x%02x %016llx %016llx %016llx "
647 "%016llx", reason,
648 scsw_is_tm(&irb->scsw) ? "t" : "c",
649 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
650 scsw_dstat(&irb->scsw), sense[0], sense[1],
651 sense[2], sense[3]);
652 } else {
653 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
654 "SORRY - NO VALID SENSE AVAILABLE\n");
655 }
656 }
657
658
659 static void
dasd_fba_dump_sense(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)660 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
661 struct irb *irb)
662 {
663 char *page;
664 struct ccw1 *act, *end, *last;
665 int len, sl, sct, count;
666
667 page = (char *) get_zeroed_page(GFP_ATOMIC);
668 if (page == NULL) {
669 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
670 "No memory to dump sense data");
671 return;
672 }
673 len = sprintf(page, PRINTK_HEADER
674 " I/O status report for device %s:\n",
675 dev_name(&device->cdev->dev));
676 len += sprintf(page + len, PRINTK_HEADER
677 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
678 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
679 len += sprintf(page + len, PRINTK_HEADER
680 " device %s: Failing CCW: %p\n",
681 dev_name(&device->cdev->dev),
682 (void *) (addr_t) irb->scsw.cmd.cpa);
683 if (irb->esw.esw0.erw.cons) {
684 for (sl = 0; sl < 4; sl++) {
685 len += sprintf(page + len, PRINTK_HEADER
686 " Sense(hex) %2d-%2d:",
687 (8 * sl), ((8 * sl) + 7));
688
689 for (sct = 0; sct < 8; sct++) {
690 len += sprintf(page + len, " %02x",
691 irb->ecw[8 * sl + sct]);
692 }
693 len += sprintf(page + len, "\n");
694 }
695 } else {
696 len += sprintf(page + len, PRINTK_HEADER
697 " SORRY - NO VALID SENSE AVAILABLE\n");
698 }
699 printk(KERN_ERR "%s", page);
700
701 /* dump the Channel Program */
702 /* print first CCWs (maximum 8) */
703 act = req->cpaddr;
704 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
705 end = min(act + 8, last);
706 len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
707 while (act <= end) {
708 len += sprintf(page + len, PRINTK_HEADER
709 " CCW %p: %08X %08X DAT:",
710 act, ((int *) act)[0], ((int *) act)[1]);
711 for (count = 0; count < 32 && count < act->count;
712 count += sizeof(int))
713 len += sprintf(page + len, " %08X",
714 ((int *) (addr_t) act->cda)
715 [(count>>2)]);
716 len += sprintf(page + len, "\n");
717 act++;
718 }
719 printk(KERN_ERR "%s", page);
720
721
722 /* print failing CCW area */
723 len = 0;
724 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
725 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
726 len += sprintf(page + len, PRINTK_HEADER "......\n");
727 }
728 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
729 while (act <= end) {
730 len += sprintf(page + len, PRINTK_HEADER
731 " CCW %p: %08X %08X DAT:",
732 act, ((int *) act)[0], ((int *) act)[1]);
733 for (count = 0; count < 32 && count < act->count;
734 count += sizeof(int))
735 len += sprintf(page + len, " %08X",
736 ((int *) (addr_t) act->cda)
737 [(count>>2)]);
738 len += sprintf(page + len, "\n");
739 act++;
740 }
741
742 /* print last CCWs */
743 if (act < last - 2) {
744 act = last - 2;
745 len += sprintf(page + len, PRINTK_HEADER "......\n");
746 }
747 while (act <= last) {
748 len += sprintf(page + len, PRINTK_HEADER
749 " CCW %p: %08X %08X DAT:",
750 act, ((int *) act)[0], ((int *) act)[1]);
751 for (count = 0; count < 32 && count < act->count;
752 count += sizeof(int))
753 len += sprintf(page + len, " %08X",
754 ((int *) (addr_t) act->cda)
755 [(count>>2)]);
756 len += sprintf(page + len, "\n");
757 act++;
758 }
759 if (len > 0)
760 printk(KERN_ERR "%s", page);
761 free_page((unsigned long) page);
762 }
763
764 /*
765 * Initialize block layer request queue.
766 */
dasd_fba_setup_blk_queue(struct dasd_block * block)767 static void dasd_fba_setup_blk_queue(struct dasd_block *block)
768 {
769 unsigned int logical_block_size = block->bp_block;
770 struct request_queue *q = block->gdp->queue;
771 unsigned int max_bytes, max_discard_sectors;
772 int max;
773
774 max = DASD_FBA_MAX_BLOCKS << block->s2b_shift;
775 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
776 q->limits.max_dev_sectors = max;
777 blk_queue_logical_block_size(q, logical_block_size);
778 blk_queue_max_hw_sectors(q, max);
779 blk_queue_max_segments(q, USHRT_MAX);
780 /* With page sized segments each segment can be translated into one idaw/tidaw */
781 blk_queue_max_segment_size(q, PAGE_SIZE);
782 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
783
784 q->limits.discard_granularity = logical_block_size;
785
786 /* Calculate max_discard_sectors and make it PAGE aligned */
787 max_bytes = USHRT_MAX * logical_block_size;
788 max_bytes = ALIGN_DOWN(max_bytes, PAGE_SIZE);
789 max_discard_sectors = max_bytes / logical_block_size;
790
791 blk_queue_max_discard_sectors(q, max_discard_sectors);
792 blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
793 }
794
dasd_fba_pe_handler(struct dasd_device * device,__u8 tbvpm,__u8 fcsecpm)795 static int dasd_fba_pe_handler(struct dasd_device *device,
796 __u8 tbvpm, __u8 fcsecpm)
797 {
798 return dasd_generic_verify_path(device, tbvpm);
799 }
800
801 static struct dasd_discipline dasd_fba_discipline = {
802 .owner = THIS_MODULE,
803 .name = "FBA ",
804 .ebcname = "FBA ",
805 .check_device = dasd_fba_check_characteristics,
806 .do_analysis = dasd_fba_do_analysis,
807 .pe_handler = dasd_fba_pe_handler,
808 .setup_blk_queue = dasd_fba_setup_blk_queue,
809 .fill_geometry = dasd_fba_fill_geometry,
810 .start_IO = dasd_start_IO,
811 .term_IO = dasd_term_IO,
812 .handle_terminated_request = dasd_fba_handle_terminated_request,
813 .erp_action = dasd_fba_erp_action,
814 .erp_postaction = dasd_fba_erp_postaction,
815 .check_for_device_change = dasd_fba_check_for_device_change,
816 .build_cp = dasd_fba_build_cp,
817 .free_cp = dasd_fba_free_cp,
818 .dump_sense = dasd_fba_dump_sense,
819 .dump_sense_dbf = dasd_fba_dump_sense_dbf,
820 .fill_info = dasd_fba_fill_info,
821 };
822
823 static int __init
dasd_fba_init(void)824 dasd_fba_init(void)
825 {
826 int ret;
827
828 ASCEBC(dasd_fba_discipline.ebcname, 4);
829
830 dasd_fba_zero_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
831 if (!dasd_fba_zero_page)
832 return -ENOMEM;
833
834 ret = ccw_driver_register(&dasd_fba_driver);
835 if (!ret)
836 wait_for_device_probe();
837
838 return ret;
839 }
840
841 static void __exit
dasd_fba_cleanup(void)842 dasd_fba_cleanup(void)
843 {
844 ccw_driver_unregister(&dasd_fba_driver);
845 free_page((unsigned long)dasd_fba_zero_page);
846 }
847
848 module_init(dasd_fba_init);
849 module_exit(dasd_fba_cleanup);
850