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 #define FBA_DEFAULT_RETRIES 32
29
30 #define DASD_FBA_CCW_WRITE 0x41
31 #define DASD_FBA_CCW_READ 0x42
32 #define DASD_FBA_CCW_LOCATE 0x43
33 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
34
35 MODULE_DESCRIPTION("S/390 DASD FBA Disks device driver");
36 MODULE_LICENSE("GPL");
37
38 static struct dasd_discipline dasd_fba_discipline;
39 static void *dasd_fba_zero_page;
40
41 struct dasd_fba_private {
42 struct dasd_fba_characteristics rdc_data;
43 };
44
45 static struct ccw_device_id dasd_fba_ids[] = {
46 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
47 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
48 { /* end of list */ },
49 };
50
51 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
52
53 static int
dasd_fba_set_online(struct ccw_device * cdev)54 dasd_fba_set_online(struct ccw_device *cdev)
55 {
56 return dasd_generic_set_online(cdev, &dasd_fba_discipline);
57 }
58
59 static struct ccw_driver dasd_fba_driver = {
60 .driver = {
61 .name = "dasd-fba",
62 .owner = THIS_MODULE,
63 .dev_groups = dasd_dev_groups,
64 },
65 .ids = dasd_fba_ids,
66 .probe = dasd_generic_probe,
67 .remove = dasd_generic_remove,
68 .set_offline = dasd_generic_set_offline,
69 .set_online = dasd_fba_set_online,
70 .notify = dasd_generic_notify,
71 .path_event = dasd_generic_path_event,
72 .int_class = IRQIO_DAS,
73 };
74
75 static void
define_extent(struct ccw1 * ccw,struct DE_fba_data * data,int rw,int blksize,int beg,int nr)76 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
77 int blksize, int beg, int nr)
78 {
79 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
80 ccw->flags = 0;
81 ccw->count = 16;
82 ccw->cda = virt_to_dma32(data);
83 memset(data, 0, sizeof (struct DE_fba_data));
84 if (rw == WRITE)
85 (data->mask).perm = 0x0;
86 else if (rw == READ)
87 (data->mask).perm = 0x1;
88 else
89 data->mask.perm = 0x2;
90 data->blk_size = blksize;
91 data->ext_loc = beg;
92 data->ext_end = nr - 1;
93 }
94
95 static void
locate_record(struct ccw1 * ccw,struct LO_fba_data * data,int rw,int block_nr,int block_ct)96 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
97 int block_nr, int block_ct)
98 {
99 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
100 ccw->flags = 0;
101 ccw->count = 8;
102 ccw->cda = virt_to_dma32(data);
103 memset(data, 0, sizeof (struct LO_fba_data));
104 if (rw == WRITE)
105 data->operation.cmd = 0x5;
106 else if (rw == READ)
107 data->operation.cmd = 0x6;
108 else
109 data->operation.cmd = 0x8;
110 data->blk_nr = block_nr;
111 data->blk_ct = block_ct;
112 }
113
114 static int
dasd_fba_check_characteristics(struct dasd_device * device)115 dasd_fba_check_characteristics(struct dasd_device *device)
116 {
117 struct dasd_fba_private *private = device->private;
118 struct ccw_device *cdev = device->cdev;
119 struct dasd_block *block;
120 int readonly, rc;
121
122 if (!private) {
123 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
124 if (!private) {
125 dev_warn(&device->cdev->dev,
126 "Allocating memory for private DASD "
127 "data failed\n");
128 return -ENOMEM;
129 }
130 device->private = private;
131 } else {
132 memset(private, 0, sizeof(*private));
133 }
134 block = dasd_alloc_block();
135 if (IS_ERR(block)) {
136 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
137 "dasd block structure");
138 device->private = NULL;
139 kfree(private);
140 return PTR_ERR(block);
141 }
142 device->block = block;
143 block->base = device;
144
145 /* Read Device Characteristics */
146 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
147 &private->rdc_data, 32);
148 if (rc) {
149 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
150 "characteristics returned error %d", rc);
151 device->block = NULL;
152 dasd_free_block(block);
153 device->private = NULL;
154 kfree(private);
155 return rc;
156 }
157
158 device->default_expires = DASD_EXPIRES;
159 device->default_retries = FBA_DEFAULT_RETRIES;
160 dasd_path_set_opm(device, LPM_ANYPATH);
161
162 readonly = dasd_device_is_ro(device);
163 if (readonly)
164 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
165
166 /* FBA supports discard, set the according feature bit */
167 dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);
168
169 dev_info(&device->cdev->dev,
170 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
171 "and %d B/blk%s\n",
172 cdev->id.dev_type,
173 cdev->id.dev_model,
174 cdev->id.cu_type,
175 cdev->id.cu_model,
176 ((private->rdc_data.blk_bdsa *
177 (private->rdc_data.blk_size >> 9)) >> 11),
178 private->rdc_data.blk_size,
179 readonly ? ", read-only device" : "");
180 return 0;
181 }
182
dasd_fba_do_analysis(struct dasd_block * block)183 static int dasd_fba_do_analysis(struct dasd_block *block)
184 {
185 struct dasd_fba_private *private = block->base->private;
186 int sb, rc;
187
188 rc = dasd_check_blocksize(private->rdc_data.blk_size);
189 if (rc) {
190 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
191 private->rdc_data.blk_size);
192 return rc;
193 }
194 block->blocks = private->rdc_data.blk_bdsa;
195 block->bp_block = private->rdc_data.blk_size;
196 block->s2b_shift = 0; /* bits to shift 512 to get a block */
197 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
198 block->s2b_shift++;
199 return 0;
200 }
201
dasd_fba_fill_geometry(struct dasd_block * block,struct hd_geometry * geo)202 static int dasd_fba_fill_geometry(struct dasd_block *block,
203 struct hd_geometry *geo)
204 {
205 if (dasd_check_blocksize(block->bp_block) != 0)
206 return -EINVAL;
207 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
208 geo->heads = 16;
209 geo->sectors = 128 >> block->s2b_shift;
210 return 0;
211 }
212
213 static dasd_erp_fn_t
dasd_fba_erp_action(struct dasd_ccw_req * cqr)214 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
215 {
216 return dasd_default_erp_action;
217 }
218
219 static dasd_erp_fn_t
dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)220 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
221 {
222 if (cqr->function == dasd_default_erp_action)
223 return dasd_default_erp_postaction;
224
225 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
226 cqr->function);
227 return NULL;
228 }
229
dasd_fba_check_for_device_change(struct dasd_device * device,struct dasd_ccw_req * cqr,struct irb * irb)230 static void dasd_fba_check_for_device_change(struct dasd_device *device,
231 struct dasd_ccw_req *cqr,
232 struct irb *irb)
233 {
234 char mask;
235
236 /* first of all check for state change pending interrupt */
237 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
238 if ((irb->scsw.cmd.dstat & mask) == mask)
239 dasd_generic_handle_state_change(device);
240 };
241
242
243 /*
244 * Builds a CCW with no data payload
245 */
ccw_write_no_data(struct ccw1 * ccw)246 static void ccw_write_no_data(struct ccw1 *ccw)
247 {
248 ccw->cmd_code = DASD_FBA_CCW_WRITE;
249 ccw->flags |= CCW_FLAG_SLI;
250 ccw->count = 0;
251 }
252
253 /*
254 * Builds a CCW that writes only zeroes.
255 */
ccw_write_zero(struct ccw1 * ccw,int count)256 static void ccw_write_zero(struct ccw1 *ccw, int count)
257 {
258 ccw->cmd_code = DASD_FBA_CCW_WRITE;
259 ccw->flags |= CCW_FLAG_SLI;
260 ccw->count = count;
261 ccw->cda = virt_to_dma32(dasd_fba_zero_page);
262 }
263
264 /*
265 * Helper function to count the amount of necessary CCWs within a given range
266 * with 4k alignment and command chaining in mind.
267 */
count_ccws(sector_t first_rec,sector_t last_rec,unsigned int blocks_per_page)268 static int count_ccws(sector_t first_rec, sector_t last_rec,
269 unsigned int blocks_per_page)
270 {
271 sector_t wz_stop = 0, d_stop = 0;
272 int cur_pos = 0;
273 int count = 0;
274
275 if (first_rec % blocks_per_page != 0) {
276 wz_stop = first_rec + blocks_per_page -
277 (first_rec % blocks_per_page) - 1;
278 if (wz_stop > last_rec)
279 wz_stop = last_rec;
280 cur_pos = wz_stop - first_rec + 1;
281 count++;
282 }
283
284 if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
285 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
286 d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
287 blocks_per_page);
288 else
289 d_stop = last_rec;
290
291 cur_pos += d_stop - (first_rec + cur_pos) + 1;
292 count++;
293 }
294
295 if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec)
296 count++;
297
298 return count;
299 }
300
301 /*
302 * This function builds a CCW request for block layer discard requests.
303 * Each page in the z/VM hypervisor that represents certain records of an FBA
304 * device will be padded with zeros. This is a special behaviour of the WRITE
305 * command which is triggered when no data payload is added to the CCW.
306 *
307 * Note: Due to issues in some z/VM versions, we can't fully utilise this
308 * special behaviour. We have to keep a 4k (or 8 block) alignment in mind to
309 * work around those issues and write actual zeroes to the unaligned parts in
310 * the request. This workaround might be removed in the future.
311 */
dasd_fba_build_cp_discard(struct dasd_device * memdev,struct dasd_block * block,struct request * req)312 static struct dasd_ccw_req *dasd_fba_build_cp_discard(
313 struct dasd_device *memdev,
314 struct dasd_block *block,
315 struct request *req)
316 {
317 struct LO_fba_data *LO_data;
318 struct dasd_ccw_req *cqr;
319 struct ccw1 *ccw;
320
321 sector_t wz_stop = 0, d_stop = 0;
322 sector_t first_rec, last_rec;
323
324 unsigned int blksize = block->bp_block;
325 unsigned int blocks_per_page;
326 int wz_count = 0;
327 int d_count = 0;
328 int cur_pos = 0; /* Current position within the extent */
329 int count = 0;
330 int cplength;
331 int datasize;
332 int nr_ccws;
333
334 first_rec = blk_rq_pos(req) >> block->s2b_shift;
335 last_rec =
336 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
337 count = last_rec - first_rec + 1;
338
339 blocks_per_page = BLOCKS_PER_PAGE(blksize);
340 nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page);
341
342 /* define extent + nr_ccws * locate record + nr_ccws * single CCW */
343 cplength = 1 + 2 * nr_ccws;
344 datasize = sizeof(struct DE_fba_data) +
345 nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
346
347 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
348 blk_mq_rq_to_pdu(req));
349 if (IS_ERR(cqr))
350 return cqr;
351
352 ccw = cqr->cpaddr;
353
354 define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count);
355 LO_data = cqr->data + sizeof(struct DE_fba_data);
356
357 /* First part is not aligned. Calculate range to write zeroes. */
358 if (first_rec % blocks_per_page != 0) {
359 wz_stop = first_rec + blocks_per_page -
360 (first_rec % blocks_per_page) - 1;
361 if (wz_stop > last_rec)
362 wz_stop = last_rec;
363 wz_count = wz_stop - first_rec + 1;
364
365 ccw[-1].flags |= CCW_FLAG_CC;
366 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
367
368 ccw[-1].flags |= CCW_FLAG_CC;
369 ccw_write_zero(ccw++, wz_count * blksize);
370
371 cur_pos = wz_count;
372 }
373
374 /* We can do proper discard when we've got at least blocks_per_page blocks. */
375 if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
376 /* is last record at page boundary? */
377 if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
378 d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
379 blocks_per_page);
380 else
381 d_stop = last_rec;
382
383 d_count = d_stop - (first_rec + cur_pos) + 1;
384
385 ccw[-1].flags |= CCW_FLAG_CC;
386 locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count);
387
388 ccw[-1].flags |= CCW_FLAG_CC;
389 ccw_write_no_data(ccw++);
390
391 cur_pos += d_count;
392 }
393
394 /* We might still have some bits left which need to be zeroed. */
395 if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) {
396 if (d_stop != 0)
397 wz_count = last_rec - d_stop;
398 else if (wz_stop != 0)
399 wz_count = last_rec - wz_stop;
400 else
401 wz_count = count;
402
403 ccw[-1].flags |= CCW_FLAG_CC;
404 locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
405
406 ccw[-1].flags |= CCW_FLAG_CC;
407 ccw_write_zero(ccw++, wz_count * blksize);
408 }
409
410 if (blk_noretry_request(req) ||
411 block->base->features & DASD_FEATURE_FAILFAST)
412 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
413
414 cqr->startdev = memdev;
415 cqr->memdev = memdev;
416 cqr->block = block;
417 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
418 cqr->retries = memdev->default_retries;
419 cqr->buildclk = get_tod_clock();
420 cqr->status = DASD_CQR_FILLED;
421
422 return cqr;
423 }
424
dasd_fba_build_cp_regular(struct dasd_device * memdev,struct dasd_block * block,struct request * req)425 static struct dasd_ccw_req *dasd_fba_build_cp_regular(
426 struct dasd_device *memdev,
427 struct dasd_block *block,
428 struct request *req)
429 {
430 struct dasd_fba_private *private = block->base->private;
431 dma64_t *idaws;
432 struct LO_fba_data *LO_data;
433 struct dasd_ccw_req *cqr;
434 struct ccw1 *ccw;
435 struct req_iterator iter;
436 struct bio_vec bv;
437 char *dst;
438 int count, cidaw, cplength, datasize;
439 sector_t recid, first_rec, last_rec;
440 unsigned int blksize, off;
441 unsigned char cmd;
442
443 if (rq_data_dir(req) == READ) {
444 cmd = DASD_FBA_CCW_READ;
445 } else if (rq_data_dir(req) == WRITE) {
446 cmd = DASD_FBA_CCW_WRITE;
447 } else
448 return ERR_PTR(-EINVAL);
449 blksize = block->bp_block;
450 /* Calculate record id of first and last block. */
451 first_rec = blk_rq_pos(req) >> block->s2b_shift;
452 last_rec =
453 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
454 /* Check struct bio and count the number of blocks for the request. */
455 count = 0;
456 cidaw = 0;
457 rq_for_each_segment(bv, req, iter) {
458 if (bv.bv_len & (blksize - 1))
459 /* Fba can only do full blocks. */
460 return ERR_PTR(-EINVAL);
461 count += bv.bv_len >> (block->s2b_shift + 9);
462 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
463 cidaw += bv.bv_len / blksize;
464 }
465 /* Paranoia. */
466 if (count != last_rec - first_rec + 1)
467 return ERR_PTR(-EINVAL);
468 /* 1x define extent + 1x locate record + number of blocks */
469 cplength = 2 + count;
470 /* 1x define extent + 1x locate record */
471 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
472 cidaw * sizeof(unsigned long);
473 /*
474 * Find out number of additional locate record ccws if the device
475 * can't do data chaining.
476 */
477 if (private->rdc_data.mode.bits.data_chain == 0) {
478 cplength += count - 1;
479 datasize += (count - 1)*sizeof(struct LO_fba_data);
480 }
481 /* Allocate the ccw request. */
482 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev,
483 blk_mq_rq_to_pdu(req));
484 if (IS_ERR(cqr))
485 return cqr;
486 ccw = cqr->cpaddr;
487 /* First ccw is define extent. */
488 define_extent(ccw++, cqr->data, rq_data_dir(req),
489 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
490 /* Build locate_record + read/write ccws. */
491 idaws = (dma64_t *)(cqr->data + sizeof(struct DE_fba_data));
492 LO_data = (struct LO_fba_data *) (idaws + cidaw);
493 /* Locate record for all blocks for smart devices. */
494 if (private->rdc_data.mode.bits.data_chain != 0) {
495 ccw[-1].flags |= CCW_FLAG_CC;
496 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
497 }
498 recid = first_rec;
499 rq_for_each_segment(bv, req, iter) {
500 dst = bvec_virt(&bv);
501 if (dasd_page_cache) {
502 char *copy = kmem_cache_alloc(dasd_page_cache,
503 GFP_DMA | __GFP_NOWARN);
504 if (copy && rq_data_dir(req) == WRITE)
505 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
506 if (copy)
507 dst = copy + bv.bv_offset;
508 }
509 for (off = 0; off < bv.bv_len; off += blksize) {
510 /* Locate record for stupid devices. */
511 if (private->rdc_data.mode.bits.data_chain == 0) {
512 ccw[-1].flags |= CCW_FLAG_CC;
513 locate_record(ccw, LO_data++,
514 rq_data_dir(req),
515 recid - first_rec, 1);
516 ccw->flags = CCW_FLAG_CC;
517 ccw++;
518 } else {
519 if (recid > first_rec)
520 ccw[-1].flags |= CCW_FLAG_DC;
521 else
522 ccw[-1].flags |= CCW_FLAG_CC;
523 }
524 ccw->cmd_code = cmd;
525 ccw->count = block->bp_block;
526 if (idal_is_needed(dst, blksize)) {
527 ccw->cda = virt_to_dma32(idaws);
528 ccw->flags = CCW_FLAG_IDA;
529 idaws = idal_create_words(idaws, dst, blksize);
530 } else {
531 ccw->cda = virt_to_dma32(dst);
532 ccw->flags = 0;
533 }
534 ccw++;
535 dst += blksize;
536 recid++;
537 }
538 }
539 if (blk_noretry_request(req) ||
540 block->base->features & DASD_FEATURE_FAILFAST)
541 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
542 cqr->startdev = memdev;
543 cqr->memdev = memdev;
544 cqr->block = block;
545 cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
546 cqr->retries = memdev->default_retries;
547 cqr->buildclk = get_tod_clock();
548 cqr->status = DASD_CQR_FILLED;
549 return cqr;
550 }
551
dasd_fba_build_cp(struct dasd_device * memdev,struct dasd_block * block,struct request * req)552 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev,
553 struct dasd_block *block,
554 struct request *req)
555 {
556 if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES)
557 return dasd_fba_build_cp_discard(memdev, block, req);
558 else
559 return dasd_fba_build_cp_regular(memdev, block, req);
560 }
561
562 static int
dasd_fba_free_cp(struct dasd_ccw_req * cqr,struct request * req)563 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
564 {
565 struct dasd_fba_private *private = cqr->block->base->private;
566 struct ccw1 *ccw;
567 struct req_iterator iter;
568 struct bio_vec bv;
569 char *dst, *cda;
570 unsigned int blksize, off;
571 int status;
572
573 if (!dasd_page_cache)
574 goto out;
575 blksize = cqr->block->bp_block;
576 ccw = cqr->cpaddr;
577 /* Skip over define extent & locate record. */
578 ccw++;
579 if (private->rdc_data.mode.bits.data_chain != 0)
580 ccw++;
581 rq_for_each_segment(bv, req, iter) {
582 dst = bvec_virt(&bv);
583 for (off = 0; off < bv.bv_len; off += blksize) {
584 /* Skip locate record. */
585 if (private->rdc_data.mode.bits.data_chain == 0)
586 ccw++;
587 if (dst) {
588 if (ccw->flags & CCW_FLAG_IDA)
589 cda = dma64_to_virt(*((dma64_t *)dma32_to_virt(ccw->cda)));
590 else
591 cda = dma32_to_virt(ccw->cda);
592 if (dst != cda) {
593 if (rq_data_dir(req) == READ)
594 memcpy(dst, cda, bv.bv_len);
595 kmem_cache_free(dasd_page_cache,
596 (void *)((addr_t)cda & PAGE_MASK));
597 }
598 dst = NULL;
599 }
600 ccw++;
601 }
602 }
603 out:
604 status = cqr->status == DASD_CQR_DONE;
605 dasd_sfree_request(cqr, cqr->memdev);
606 return status;
607 }
608
dasd_fba_handle_terminated_request(struct dasd_ccw_req * cqr)609 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
610 {
611 if (cqr->retries < 0)
612 cqr->status = DASD_CQR_FAILED;
613 else
614 cqr->status = DASD_CQR_FILLED;
615 };
616
617 static int
dasd_fba_fill_info(struct dasd_device * device,struct dasd_information2_t * info)618 dasd_fba_fill_info(struct dasd_device * device,
619 struct dasd_information2_t * info)
620 {
621 struct dasd_fba_private *private = device->private;
622
623 info->label_block = 1;
624 info->FBA_layout = 1;
625 info->format = DASD_FORMAT_LDL;
626 info->characteristics_size = sizeof(private->rdc_data);
627 memcpy(info->characteristics, &private->rdc_data,
628 sizeof(private->rdc_data));
629 info->confdata_size = 0;
630 return 0;
631 }
632
633 static void
dasd_fba_dump_sense_dbf(struct dasd_device * device,struct irb * irb,char * reason)634 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
635 char *reason)
636 {
637 u64 *sense;
638
639 sense = (u64 *) dasd_get_sense(irb);
640 if (sense) {
641 DBF_DEV_EVENT(DBF_EMERG, device,
642 "%s: %s %02x%02x%02x %016llx %016llx %016llx "
643 "%016llx", reason,
644 scsw_is_tm(&irb->scsw) ? "t" : "c",
645 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
646 scsw_dstat(&irb->scsw), sense[0], sense[1],
647 sense[2], sense[3]);
648 } else {
649 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
650 "SORRY - NO VALID SENSE AVAILABLE\n");
651 }
652 }
653
654
655 static void
dasd_fba_dump_sense(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)656 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
657 struct irb *irb)
658 {
659 struct ccw1 *act, *end, *last;
660 int len, sl, sct, count;
661 struct device *dev;
662 char *page;
663
664 dev = &device->cdev->dev;
665
666 page = (char *) get_zeroed_page(GFP_ATOMIC);
667 if (page == NULL) {
668 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
669 "No memory to dump sense data");
670 return;
671 }
672 len = sprintf(page, "I/O status report:\n");
673 len += sprintf(page + len, "in req: %px CS: 0x%02X DS: 0x%02X\n",
674 req, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
675 len += sprintf(page + len, "Failing CCW: %px\n",
676 (void *)(u64)dma32_to_u32(irb->scsw.cmd.cpa));
677 if (irb->esw.esw0.erw.cons) {
678 for (sl = 0; sl < 4; sl++) {
679 len += sprintf(page + len, "Sense(hex) %2d-%2d:",
680 (8 * sl), ((8 * sl) + 7));
681
682 for (sct = 0; sct < 8; sct++) {
683 len += sprintf(page + len, " %02x",
684 irb->ecw[8 * sl + sct]);
685 }
686 len += sprintf(page + len, "\n");
687 }
688 } else {
689 len += sprintf(page + len, "SORRY - NO VALID SENSE AVAILABLE\n");
690 }
691 dev_err(dev, "%s", page);
692
693 /* dump the Channel Program */
694 /* print first CCWs (maximum 8) */
695 act = req->cpaddr;
696 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
697 end = min(act + 8, last);
698 len = sprintf(page, "Related CP in req: %px\n", req);
699 while (act <= end) {
700 len += sprintf(page + len, "CCW %px: %08X %08X DAT:",
701 act, ((int *) act)[0], ((int *) act)[1]);
702 for (count = 0; count < 32 && count < act->count;
703 count += sizeof(int))
704 len += sprintf(page + len, " %08X",
705 ((int *)dma32_to_virt(act->cda))
706 [(count>>2)]);
707 len += sprintf(page + len, "\n");
708 act++;
709 }
710 dev_err(dev, "%s", page);
711
712 /* print failing CCW area */
713 len = 0;
714 if (act < ((struct ccw1 *)dma32_to_virt(irb->scsw.cmd.cpa)) - 2) {
715 act = ((struct ccw1 *)dma32_to_virt(irb->scsw.cmd.cpa)) - 2;
716 len += sprintf(page + len, "......\n");
717 }
718 end = min((struct ccw1 *)dma32_to_virt(irb->scsw.cmd.cpa) + 2, last);
719 while (act <= end) {
720 len += sprintf(page + len, "CCW %px: %08X %08X DAT:",
721 act, ((int *) act)[0], ((int *) act)[1]);
722 for (count = 0; count < 32 && count < act->count;
723 count += sizeof(int))
724 len += sprintf(page + len, " %08X",
725 ((int *)dma32_to_virt(act->cda))
726 [(count>>2)]);
727 len += sprintf(page + len, "\n");
728 act++;
729 }
730
731 /* print last CCWs */
732 if (act < last - 2) {
733 act = last - 2;
734 len += sprintf(page + len, "......\n");
735 }
736 while (act <= last) {
737 len += sprintf(page + len, "CCW %px: %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 *)dma32_to_virt(act->cda))
743 [(count>>2)]);
744 len += sprintf(page + len, "\n");
745 act++;
746 }
747 if (len > 0)
748 dev_err(dev, "%s", page);
749 free_page((unsigned long) page);
750 }
751
dasd_fba_max_sectors(struct dasd_block * block)752 static unsigned int dasd_fba_max_sectors(struct dasd_block *block)
753 {
754 return DASD_FBA_MAX_BLOCKS << block->s2b_shift;
755 }
756
dasd_fba_pe_handler(struct dasd_device * device,__u8 tbvpm,__u8 fcsecpm)757 static int dasd_fba_pe_handler(struct dasd_device *device,
758 __u8 tbvpm, __u8 fcsecpm)
759 {
760 return dasd_generic_verify_path(device, tbvpm);
761 }
762
763 static struct dasd_discipline dasd_fba_discipline = {
764 .owner = THIS_MODULE,
765 .name = "FBA ",
766 .ebcname = "FBA ",
767 .has_discard = true,
768 .check_device = dasd_fba_check_characteristics,
769 .do_analysis = dasd_fba_do_analysis,
770 .pe_handler = dasd_fba_pe_handler,
771 .max_sectors = dasd_fba_max_sectors,
772 .fill_geometry = dasd_fba_fill_geometry,
773 .start_IO = dasd_start_IO,
774 .term_IO = dasd_term_IO,
775 .handle_terminated_request = dasd_fba_handle_terminated_request,
776 .erp_action = dasd_fba_erp_action,
777 .erp_postaction = dasd_fba_erp_postaction,
778 .check_for_device_change = dasd_fba_check_for_device_change,
779 .build_cp = dasd_fba_build_cp,
780 .free_cp = dasd_fba_free_cp,
781 .dump_sense = dasd_fba_dump_sense,
782 .dump_sense_dbf = dasd_fba_dump_sense_dbf,
783 .fill_info = dasd_fba_fill_info,
784 };
785
786 static int __init
dasd_fba_init(void)787 dasd_fba_init(void)
788 {
789 int ret;
790
791 ASCEBC(dasd_fba_discipline.ebcname, 4);
792
793 dasd_fba_zero_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
794 if (!dasd_fba_zero_page)
795 return -ENOMEM;
796
797 ret = ccw_driver_register(&dasd_fba_driver);
798 if (!ret)
799 wait_for_device_probe();
800
801 return ret;
802 }
803
804 static void __exit
dasd_fba_cleanup(void)805 dasd_fba_cleanup(void)
806 {
807 ccw_driver_unregister(&dasd_fba_driver);
808 free_page((unsigned long)dasd_fba_zero_page);
809 }
810
811 module_init(dasd_fba_init);
812 module_exit(dasd_fba_cleanup);
813