1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * sd.c Copyright (C) 1992 Drew Eckhardt
4 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5 *
6 * Linux scsi disk driver
7 * Initial versions: Drew Eckhardt
8 * Subsequent revisions: Eric Youngdale
9 * Modification history:
10 * - Drew Eckhardt <drew@colorado.edu> original
11 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
12 * outstanding request, and other enhancements.
13 * Support loadable low-level scsi drivers.
14 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
15 * eight major numbers.
16 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
17 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
18 * sd_init and cleanups.
19 * - Alex Davis <letmein@erols.com> Fix problem where partition info
20 * not being read in sd_open. Fix problem where removable media
21 * could be ejected after sd_open.
22 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
23 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
24 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
25 * Support 32k/1M disks.
26 *
27 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
28 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
29 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
30 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
31 * - entering other commands: SCSI_LOG_HLQUEUE level 3
32 * Note: when the logging level is set by the user, it must be greater
33 * than the level indicated above to trigger output.
34 */
35
36 #include <linux/bio-integrity.h>
37 #include <linux/module.h>
38 #include <linux/fs.h>
39 #include <linux/kernel.h>
40 #include <linux/mm.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/blk-pm.h>
49 #include <linux/delay.h>
50 #include <linux/rw_hint.h>
51 #include <linux/major.h>
52 #include <linux/mutex.h>
53 #include <linux/string_helpers.h>
54 #include <linux/slab.h>
55 #include <linux/sed-opal.h>
56 #include <linux/pm_runtime.h>
57 #include <linux/pr.h>
58 #include <linux/t10-pi.h>
59 #include <linux/uaccess.h>
60 #include <linux/unaligned.h>
61
62 #include <scsi/scsi.h>
63 #include <scsi/scsi_cmnd.h>
64 #include <scsi/scsi_dbg.h>
65 #include <scsi/scsi_device.h>
66 #include <scsi/scsi_devinfo.h>
67 #include <scsi/scsi_driver.h>
68 #include <scsi/scsi_eh.h>
69 #include <scsi/scsi_host.h>
70 #include <scsi/scsi_ioctl.h>
71 #include <scsi/scsicam.h>
72 #include <scsi/scsi_common.h>
73
74 #include "sd.h"
75 #include "scsi_priv.h"
76 #include "scsi_logging.h"
77
78 MODULE_AUTHOR("Eric Youngdale");
79 MODULE_DESCRIPTION("SCSI disk (sd) driver");
80 MODULE_LICENSE("GPL");
81
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
95 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
96 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
97 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
98 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
99 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
100 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
101 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
102
103 #define SD_MINORS 16
104
105 static void sd_config_write_same(struct scsi_disk *sdkp,
106 struct queue_limits *lim);
107 static void sd_revalidate_disk(struct gendisk *);
108
109 static DEFINE_IDA(sd_index_ida);
110 static DEFINE_MUTEX(sd_mutex_lock);
111
112 static mempool_t *sd_page_pool;
113 static mempool_t *sd_large_page_pool;
114 static atomic_t sd_large_page_pool_users = ATOMIC_INIT(0);
115 static struct lock_class_key sd_bio_compl_lkclass;
116
117 static const char *sd_cache_types[] = {
118 "write through", "none", "write back",
119 "write back, no read (daft)"
120 };
121
sd_large_pool_create(void)122 static int sd_large_pool_create(void)
123 {
124 mutex_lock(&sd_mutex_lock);
125 if (!sd_large_page_pool) {
126 sd_large_page_pool = mempool_create_page_pool(
127 SD_MEMPOOL_SIZE, get_order(BLK_MAX_BLOCK_SIZE));
128 if (!sd_large_page_pool) {
129 printk(KERN_ERR "sd: can't create large page mempool\n");
130 mutex_unlock(&sd_mutex_lock);
131 return -ENOMEM;
132 }
133 }
134 atomic_inc(&sd_large_page_pool_users);
135 mutex_unlock(&sd_mutex_lock);
136 return 0;
137 }
138
sd_large_pool_destroy(void)139 static void sd_large_pool_destroy(void)
140 {
141 mutex_lock(&sd_mutex_lock);
142 if (atomic_dec_and_test(&sd_large_page_pool_users)) {
143 mempool_destroy(sd_large_page_pool);
144 sd_large_page_pool = NULL;
145 }
146 mutex_unlock(&sd_mutex_lock);
147 }
148
sd_disable_discard(struct scsi_disk * sdkp)149 static void sd_disable_discard(struct scsi_disk *sdkp)
150 {
151 sdkp->provisioning_mode = SD_LBP_DISABLE;
152 blk_queue_disable_discard(sdkp->disk->queue);
153 }
154
sd_config_discard(struct scsi_disk * sdkp,struct queue_limits * lim,unsigned int mode)155 static void sd_config_discard(struct scsi_disk *sdkp, struct queue_limits *lim,
156 unsigned int mode)
157 {
158 unsigned int logical_block_size = sdkp->device->sector_size;
159 unsigned int max_blocks = 0;
160
161 lim->discard_alignment = sdkp->unmap_alignment * logical_block_size;
162 lim->discard_granularity = max(sdkp->physical_block_size,
163 sdkp->unmap_granularity * logical_block_size);
164 sdkp->provisioning_mode = mode;
165
166 switch (mode) {
167
168 case SD_LBP_FULL:
169 case SD_LBP_DISABLE:
170 break;
171
172 case SD_LBP_UNMAP:
173 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
174 (u32)SD_MAX_WS16_BLOCKS);
175 break;
176
177 case SD_LBP_WS16:
178 if (sdkp->device->unmap_limit_for_ws)
179 max_blocks = sdkp->max_unmap_blocks;
180 else
181 max_blocks = sdkp->max_ws_blocks;
182
183 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
184 break;
185
186 case SD_LBP_WS10:
187 if (sdkp->device->unmap_limit_for_ws)
188 max_blocks = sdkp->max_unmap_blocks;
189 else
190 max_blocks = sdkp->max_ws_blocks;
191
192 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
193 break;
194
195 case SD_LBP_ZERO:
196 max_blocks = min_not_zero(sdkp->max_ws_blocks,
197 (u32)SD_MAX_WS10_BLOCKS);
198 break;
199 }
200
201 lim->max_hw_discard_sectors = max_blocks *
202 (logical_block_size >> SECTOR_SHIFT);
203 }
204
sd_set_flush_flag(struct scsi_disk * sdkp,struct queue_limits * lim)205 static void sd_set_flush_flag(struct scsi_disk *sdkp,
206 struct queue_limits *lim)
207 {
208 if (sdkp->WCE) {
209 lim->features |= BLK_FEAT_WRITE_CACHE;
210 if (sdkp->DPOFUA)
211 lim->features |= BLK_FEAT_FUA;
212 else
213 lim->features &= ~BLK_FEAT_FUA;
214 } else {
215 lim->features &= ~(BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA);
216 }
217 }
218
219 static ssize_t
cache_type_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)220 cache_type_store(struct device *dev, struct device_attribute *attr,
221 const char *buf, size_t count)
222 {
223 int ct, rcd, wce, sp;
224 struct scsi_disk *sdkp = to_scsi_disk(dev);
225 struct scsi_device *sdp = sdkp->device;
226 char buffer[64];
227 char *buffer_data;
228 struct scsi_mode_data data;
229 struct scsi_sense_hdr sshdr;
230 static const char temp[] = "temporary ";
231 int len, ret;
232
233 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
234 /* no cache control on RBC devices; theoretically they
235 * can do it, but there's probably so many exceptions
236 * it's not worth the risk */
237 return -EINVAL;
238
239 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
240 buf += sizeof(temp) - 1;
241 sdkp->cache_override = 1;
242 } else {
243 sdkp->cache_override = 0;
244 }
245
246 ct = sysfs_match_string(sd_cache_types, buf);
247 if (ct < 0)
248 return -EINVAL;
249
250 rcd = ct & 0x01 ? 1 : 0;
251 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
252
253 if (sdkp->cache_override) {
254 struct queue_limits lim;
255
256 sdkp->WCE = wce;
257 sdkp->RCD = rcd;
258
259 lim = queue_limits_start_update(sdkp->disk->queue);
260 sd_set_flush_flag(sdkp, &lim);
261 ret = queue_limits_commit_update_frozen(sdkp->disk->queue,
262 &lim);
263 if (ret)
264 return ret;
265 return count;
266 }
267
268 if (scsi_mode_sense(sdp, 0x08, 8, 0, buffer, sizeof(buffer), SD_TIMEOUT,
269 sdkp->max_retries, &data, NULL))
270 return -EINVAL;
271 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
272 data.block_descriptor_length);
273 buffer_data = buffer + data.header_length +
274 data.block_descriptor_length;
275 buffer_data[2] &= ~0x05;
276 buffer_data[2] |= wce << 2 | rcd;
277 sp = buffer_data[0] & 0x80 ? 1 : 0;
278 buffer_data[0] &= ~0x80;
279
280 /*
281 * Ensure WP, DPOFUA, and RESERVED fields are cleared in
282 * received mode parameter buffer before doing MODE SELECT.
283 */
284 data.device_specific = 0;
285
286 ret = scsi_mode_select(sdp, 1, sp, buffer_data, len, SD_TIMEOUT,
287 sdkp->max_retries, &data, &sshdr);
288 if (ret) {
289 if (ret > 0 && scsi_sense_valid(&sshdr))
290 sd_print_sense_hdr(sdkp, &sshdr);
291 return -EINVAL;
292 }
293 sd_revalidate_disk(sdkp->disk);
294 return count;
295 }
296
297 static ssize_t
manage_start_stop_show(struct device * dev,struct device_attribute * attr,char * buf)298 manage_start_stop_show(struct device *dev,
299 struct device_attribute *attr, char *buf)
300 {
301 struct scsi_disk *sdkp = to_scsi_disk(dev);
302 struct scsi_device *sdp = sdkp->device;
303
304 return sysfs_emit(buf, "%u\n",
305 sdp->manage_system_start_stop &&
306 sdp->manage_runtime_start_stop &&
307 sdp->manage_shutdown);
308 }
309 static DEVICE_ATTR_RO(manage_start_stop);
310
311 static ssize_t
manage_system_start_stop_show(struct device * dev,struct device_attribute * attr,char * buf)312 manage_system_start_stop_show(struct device *dev,
313 struct device_attribute *attr, char *buf)
314 {
315 struct scsi_disk *sdkp = to_scsi_disk(dev);
316 struct scsi_device *sdp = sdkp->device;
317
318 return sysfs_emit(buf, "%u\n", sdp->manage_system_start_stop);
319 }
320
321 static ssize_t
manage_system_start_stop_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)322 manage_system_start_stop_store(struct device *dev,
323 struct device_attribute *attr,
324 const char *buf, size_t count)
325 {
326 struct scsi_disk *sdkp = to_scsi_disk(dev);
327 struct scsi_device *sdp = sdkp->device;
328 bool v;
329
330 if (!capable(CAP_SYS_ADMIN))
331 return -EACCES;
332
333 if (kstrtobool(buf, &v))
334 return -EINVAL;
335
336 sdp->manage_system_start_stop = v;
337
338 return count;
339 }
340 static DEVICE_ATTR_RW(manage_system_start_stop);
341
342 static ssize_t
manage_runtime_start_stop_show(struct device * dev,struct device_attribute * attr,char * buf)343 manage_runtime_start_stop_show(struct device *dev,
344 struct device_attribute *attr, char *buf)
345 {
346 struct scsi_disk *sdkp = to_scsi_disk(dev);
347 struct scsi_device *sdp = sdkp->device;
348
349 return sysfs_emit(buf, "%u\n", sdp->manage_runtime_start_stop);
350 }
351
352 static ssize_t
manage_runtime_start_stop_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)353 manage_runtime_start_stop_store(struct device *dev,
354 struct device_attribute *attr,
355 const char *buf, size_t count)
356 {
357 struct scsi_disk *sdkp = to_scsi_disk(dev);
358 struct scsi_device *sdp = sdkp->device;
359 bool v;
360
361 if (!capable(CAP_SYS_ADMIN))
362 return -EACCES;
363
364 if (kstrtobool(buf, &v))
365 return -EINVAL;
366
367 sdp->manage_runtime_start_stop = v;
368
369 return count;
370 }
371 static DEVICE_ATTR_RW(manage_runtime_start_stop);
372
manage_shutdown_show(struct device * dev,struct device_attribute * attr,char * buf)373 static ssize_t manage_shutdown_show(struct device *dev,
374 struct device_attribute *attr, char *buf)
375 {
376 struct scsi_disk *sdkp = to_scsi_disk(dev);
377 struct scsi_device *sdp = sdkp->device;
378
379 return sysfs_emit(buf, "%u\n", sdp->manage_shutdown);
380 }
381
manage_shutdown_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)382 static ssize_t manage_shutdown_store(struct device *dev,
383 struct device_attribute *attr,
384 const char *buf, size_t count)
385 {
386 struct scsi_disk *sdkp = to_scsi_disk(dev);
387 struct scsi_device *sdp = sdkp->device;
388 bool v;
389
390 if (!capable(CAP_SYS_ADMIN))
391 return -EACCES;
392
393 if (kstrtobool(buf, &v))
394 return -EINVAL;
395
396 sdp->manage_shutdown = v;
397
398 return count;
399 }
400 static DEVICE_ATTR_RW(manage_shutdown);
401
manage_restart_show(struct device * dev,struct device_attribute * attr,char * buf)402 static ssize_t manage_restart_show(struct device *dev,
403 struct device_attribute *attr, char *buf)
404 {
405 struct scsi_disk *sdkp = to_scsi_disk(dev);
406 struct scsi_device *sdp = sdkp->device;
407
408 return sysfs_emit(buf, "%u\n", sdp->manage_restart);
409 }
410
manage_restart_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)411 static ssize_t manage_restart_store(struct device *dev,
412 struct device_attribute *attr,
413 const char *buf, size_t count)
414 {
415 struct scsi_disk *sdkp = to_scsi_disk(dev);
416 struct scsi_device *sdp = sdkp->device;
417 bool v;
418
419 if (!capable(CAP_SYS_ADMIN))
420 return -EACCES;
421
422 if (kstrtobool(buf, &v))
423 return -EINVAL;
424
425 sdp->manage_restart = v;
426
427 return count;
428 }
429 static DEVICE_ATTR_RW(manage_restart);
430
431 static ssize_t
allow_restart_show(struct device * dev,struct device_attribute * attr,char * buf)432 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
433 {
434 struct scsi_disk *sdkp = to_scsi_disk(dev);
435
436 return sprintf(buf, "%u\n", sdkp->device->allow_restart);
437 }
438
439 static ssize_t
allow_restart_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)440 allow_restart_store(struct device *dev, struct device_attribute *attr,
441 const char *buf, size_t count)
442 {
443 bool v;
444 struct scsi_disk *sdkp = to_scsi_disk(dev);
445 struct scsi_device *sdp = sdkp->device;
446
447 if (!capable(CAP_SYS_ADMIN))
448 return -EACCES;
449
450 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
451 return -EINVAL;
452
453 if (kstrtobool(buf, &v))
454 return -EINVAL;
455
456 sdp->allow_restart = v;
457
458 return count;
459 }
460 static DEVICE_ATTR_RW(allow_restart);
461
462 static ssize_t
cache_type_show(struct device * dev,struct device_attribute * attr,char * buf)463 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
464 {
465 struct scsi_disk *sdkp = to_scsi_disk(dev);
466 int ct = sdkp->RCD + 2*sdkp->WCE;
467
468 return sprintf(buf, "%s\n", sd_cache_types[ct]);
469 }
470 static DEVICE_ATTR_RW(cache_type);
471
472 static ssize_t
FUA_show(struct device * dev,struct device_attribute * attr,char * buf)473 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
474 {
475 struct scsi_disk *sdkp = to_scsi_disk(dev);
476
477 return sprintf(buf, "%u\n", sdkp->DPOFUA);
478 }
479 static DEVICE_ATTR_RO(FUA);
480
481 static ssize_t
protection_type_show(struct device * dev,struct device_attribute * attr,char * buf)482 protection_type_show(struct device *dev, struct device_attribute *attr,
483 char *buf)
484 {
485 struct scsi_disk *sdkp = to_scsi_disk(dev);
486
487 return sprintf(buf, "%u\n", sdkp->protection_type);
488 }
489
490 static ssize_t
protection_type_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)491 protection_type_store(struct device *dev, struct device_attribute *attr,
492 const char *buf, size_t count)
493 {
494 struct scsi_disk *sdkp = to_scsi_disk(dev);
495 unsigned int val;
496 int err;
497
498 if (!capable(CAP_SYS_ADMIN))
499 return -EACCES;
500
501 err = kstrtouint(buf, 10, &val);
502
503 if (err)
504 return err;
505
506 if (val <= T10_PI_TYPE3_PROTECTION)
507 sdkp->protection_type = val;
508
509 return count;
510 }
511 static DEVICE_ATTR_RW(protection_type);
512
513 static ssize_t
protection_mode_show(struct device * dev,struct device_attribute * attr,char * buf)514 protection_mode_show(struct device *dev, struct device_attribute *attr,
515 char *buf)
516 {
517 struct scsi_disk *sdkp = to_scsi_disk(dev);
518 struct scsi_device *sdp = sdkp->device;
519 unsigned int dif, dix;
520
521 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
522 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
523
524 if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
525 dif = 0;
526 dix = 1;
527 }
528
529 if (!dif && !dix)
530 return sprintf(buf, "none\n");
531
532 return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
533 }
534 static DEVICE_ATTR_RO(protection_mode);
535
536 static ssize_t
app_tag_own_show(struct device * dev,struct device_attribute * attr,char * buf)537 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
538 {
539 struct scsi_disk *sdkp = to_scsi_disk(dev);
540
541 return sprintf(buf, "%u\n", sdkp->ATO);
542 }
543 static DEVICE_ATTR_RO(app_tag_own);
544
545 static ssize_t
thin_provisioning_show(struct device * dev,struct device_attribute * attr,char * buf)546 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
547 char *buf)
548 {
549 struct scsi_disk *sdkp = to_scsi_disk(dev);
550
551 return sprintf(buf, "%u\n", sdkp->lbpme);
552 }
553 static DEVICE_ATTR_RO(thin_provisioning);
554
555 /* sysfs_match_string() requires dense arrays */
556 static const char *lbp_mode[] = {
557 [SD_LBP_FULL] = "full",
558 [SD_LBP_UNMAP] = "unmap",
559 [SD_LBP_WS16] = "writesame_16",
560 [SD_LBP_WS10] = "writesame_10",
561 [SD_LBP_ZERO] = "writesame_zero",
562 [SD_LBP_DISABLE] = "disabled",
563 };
564
565 static ssize_t
provisioning_mode_show(struct device * dev,struct device_attribute * attr,char * buf)566 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
567 char *buf)
568 {
569 struct scsi_disk *sdkp = to_scsi_disk(dev);
570
571 return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
572 }
573
574 static ssize_t
provisioning_mode_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)575 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
576 const char *buf, size_t count)
577 {
578 struct scsi_disk *sdkp = to_scsi_disk(dev);
579 struct scsi_device *sdp = sdkp->device;
580 struct queue_limits lim;
581 int mode, err;
582
583 if (!capable(CAP_SYS_ADMIN))
584 return -EACCES;
585
586 if (sdp->type != TYPE_DISK)
587 return -EINVAL;
588
589 mode = sysfs_match_string(lbp_mode, buf);
590 if (mode < 0)
591 return -EINVAL;
592
593 lim = queue_limits_start_update(sdkp->disk->queue);
594 sd_config_discard(sdkp, &lim, mode);
595 err = queue_limits_commit_update_frozen(sdkp->disk->queue, &lim);
596 if (err)
597 return err;
598 return count;
599 }
600 static DEVICE_ATTR_RW(provisioning_mode);
601
602 /* sysfs_match_string() requires dense arrays */
603 static const char *zeroing_mode[] = {
604 [SD_ZERO_WRITE] = "write",
605 [SD_ZERO_WS] = "writesame",
606 [SD_ZERO_WS16_UNMAP] = "writesame_16_unmap",
607 [SD_ZERO_WS10_UNMAP] = "writesame_10_unmap",
608 };
609
610 static ssize_t
zeroing_mode_show(struct device * dev,struct device_attribute * attr,char * buf)611 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
612 char *buf)
613 {
614 struct scsi_disk *sdkp = to_scsi_disk(dev);
615
616 return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
617 }
618
619 static ssize_t
zeroing_mode_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)620 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
621 const char *buf, size_t count)
622 {
623 struct scsi_disk *sdkp = to_scsi_disk(dev);
624 int mode;
625
626 if (!capable(CAP_SYS_ADMIN))
627 return -EACCES;
628
629 mode = sysfs_match_string(zeroing_mode, buf);
630 if (mode < 0)
631 return -EINVAL;
632
633 sdkp->zeroing_mode = mode;
634
635 return count;
636 }
637 static DEVICE_ATTR_RW(zeroing_mode);
638
639 static ssize_t
max_medium_access_timeouts_show(struct device * dev,struct device_attribute * attr,char * buf)640 max_medium_access_timeouts_show(struct device *dev,
641 struct device_attribute *attr, char *buf)
642 {
643 struct scsi_disk *sdkp = to_scsi_disk(dev);
644
645 return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
646 }
647
648 static ssize_t
max_medium_access_timeouts_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)649 max_medium_access_timeouts_store(struct device *dev,
650 struct device_attribute *attr, const char *buf,
651 size_t count)
652 {
653 struct scsi_disk *sdkp = to_scsi_disk(dev);
654 int err;
655
656 if (!capable(CAP_SYS_ADMIN))
657 return -EACCES;
658
659 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
660
661 return err ? err : count;
662 }
663 static DEVICE_ATTR_RW(max_medium_access_timeouts);
664
665 static ssize_t
max_write_same_blocks_show(struct device * dev,struct device_attribute * attr,char * buf)666 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
667 char *buf)
668 {
669 struct scsi_disk *sdkp = to_scsi_disk(dev);
670
671 return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
672 }
673
674 static ssize_t
max_write_same_blocks_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)675 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
676 const char *buf, size_t count)
677 {
678 struct scsi_disk *sdkp = to_scsi_disk(dev);
679 struct scsi_device *sdp = sdkp->device;
680 struct queue_limits lim;
681 unsigned long max;
682 int err;
683
684 if (!capable(CAP_SYS_ADMIN))
685 return -EACCES;
686
687 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
688 return -EINVAL;
689
690 err = kstrtoul(buf, 10, &max);
691
692 if (err)
693 return err;
694
695 if (max == 0)
696 sdp->no_write_same = 1;
697 else if (max <= SD_MAX_WS16_BLOCKS) {
698 sdp->no_write_same = 0;
699 sdkp->max_ws_blocks = max;
700 }
701
702 lim = queue_limits_start_update(sdkp->disk->queue);
703 sd_config_write_same(sdkp, &lim);
704 err = queue_limits_commit_update_frozen(sdkp->disk->queue, &lim);
705 if (err)
706 return err;
707 return count;
708 }
709 static DEVICE_ATTR_RW(max_write_same_blocks);
710
711 static ssize_t
zoned_cap_show(struct device * dev,struct device_attribute * attr,char * buf)712 zoned_cap_show(struct device *dev, struct device_attribute *attr, char *buf)
713 {
714 struct scsi_disk *sdkp = to_scsi_disk(dev);
715
716 if (sdkp->device->type == TYPE_ZBC)
717 return sprintf(buf, "host-managed\n");
718 if (sdkp->zoned == 1)
719 return sprintf(buf, "host-aware\n");
720 if (sdkp->zoned == 2)
721 return sprintf(buf, "drive-managed\n");
722 return sprintf(buf, "none\n");
723 }
724 static DEVICE_ATTR_RO(zoned_cap);
725
726 static ssize_t
max_retries_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)727 max_retries_store(struct device *dev, struct device_attribute *attr,
728 const char *buf, size_t count)
729 {
730 struct scsi_disk *sdkp = to_scsi_disk(dev);
731 struct scsi_device *sdev = sdkp->device;
732 int retries, err;
733
734 err = kstrtoint(buf, 10, &retries);
735 if (err)
736 return err;
737
738 if (retries == SCSI_CMD_RETRIES_NO_LIMIT || retries <= SD_MAX_RETRIES) {
739 sdkp->max_retries = retries;
740 return count;
741 }
742
743 sdev_printk(KERN_ERR, sdev, "max_retries must be between -1 and %d\n",
744 SD_MAX_RETRIES);
745 return -EINVAL;
746 }
747
748 static ssize_t
max_retries_show(struct device * dev,struct device_attribute * attr,char * buf)749 max_retries_show(struct device *dev, struct device_attribute *attr,
750 char *buf)
751 {
752 struct scsi_disk *sdkp = to_scsi_disk(dev);
753
754 return sprintf(buf, "%d\n", sdkp->max_retries);
755 }
756
757 static DEVICE_ATTR_RW(max_retries);
758
759 static struct attribute *sd_disk_attrs[] = {
760 &dev_attr_cache_type.attr,
761 &dev_attr_FUA.attr,
762 &dev_attr_allow_restart.attr,
763 &dev_attr_manage_start_stop.attr,
764 &dev_attr_manage_system_start_stop.attr,
765 &dev_attr_manage_runtime_start_stop.attr,
766 &dev_attr_manage_shutdown.attr,
767 &dev_attr_manage_restart.attr,
768 &dev_attr_protection_type.attr,
769 &dev_attr_protection_mode.attr,
770 &dev_attr_app_tag_own.attr,
771 &dev_attr_thin_provisioning.attr,
772 &dev_attr_provisioning_mode.attr,
773 &dev_attr_zeroing_mode.attr,
774 &dev_attr_max_write_same_blocks.attr,
775 &dev_attr_max_medium_access_timeouts.attr,
776 &dev_attr_zoned_cap.attr,
777 &dev_attr_max_retries.attr,
778 NULL,
779 };
780 ATTRIBUTE_GROUPS(sd_disk);
781
scsi_disk_release(struct device * dev)782 static void scsi_disk_release(struct device *dev)
783 {
784 struct scsi_disk *sdkp = to_scsi_disk(dev);
785
786 ida_free(&sd_index_ida, sdkp->index);
787 put_device(&sdkp->device->sdev_gendev);
788 free_opal_dev(sdkp->opal_dev);
789
790 kfree(sdkp);
791 }
792
793 static struct class sd_disk_class = {
794 .name = "scsi_disk",
795 .dev_release = scsi_disk_release,
796 .dev_groups = sd_disk_groups,
797 };
798
799 /*
800 * Don't request a new module, as that could deadlock in multipath
801 * environment.
802 */
sd_default_probe(dev_t devt)803 static void sd_default_probe(dev_t devt)
804 {
805 }
806
807 /*
808 * Device no to disk mapping:
809 *
810 * major disc2 disc p1
811 * |............|.............|....|....| <- dev_t
812 * 31 20 19 8 7 4 3 0
813 *
814 * Inside a major, we have 16k disks, however mapped non-
815 * contiguously. The first 16 disks are for major0, the next
816 * ones with major1, ... Disk 256 is for major0 again, disk 272
817 * for major1, ...
818 * As we stay compatible with our numbering scheme, we can reuse
819 * the well-know SCSI majors 8, 65--71, 136--143.
820 */
sd_major(int major_idx)821 static int sd_major(int major_idx)
822 {
823 switch (major_idx) {
824 case 0:
825 return SCSI_DISK0_MAJOR;
826 case 1 ... 7:
827 return SCSI_DISK1_MAJOR + major_idx - 1;
828 case 8 ... 15:
829 return SCSI_DISK8_MAJOR + major_idx - 8;
830 default:
831 BUG();
832 return 0; /* shut up gcc */
833 }
834 }
835
836 #ifdef CONFIG_BLK_SED_OPAL
sd_sec_submit(void * data,u16 spsp,u8 secp,void * buffer,size_t len,bool send)837 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
838 size_t len, bool send)
839 {
840 struct scsi_disk *sdkp = data;
841 struct scsi_device *sdev = sdkp->device;
842 u8 cdb[12] = { 0, };
843 const struct scsi_exec_args exec_args = {
844 .req_flags = BLK_MQ_REQ_PM,
845 };
846 int ret;
847
848 cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
849 cdb[1] = secp;
850 put_unaligned_be16(spsp, &cdb[2]);
851 put_unaligned_be32(len, &cdb[6]);
852
853 ret = scsi_execute_cmd(sdev, cdb, send ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
854 buffer, len, SD_TIMEOUT, sdkp->max_retries,
855 &exec_args);
856 return ret <= 0 ? ret : -EIO;
857 }
858 #endif /* CONFIG_BLK_SED_OPAL */
859
860 /*
861 * Look up the DIX operation based on whether the command is read or
862 * write and whether dix and dif are enabled.
863 */
sd_prot_op(bool write,bool dix,bool dif)864 static unsigned int sd_prot_op(bool write, bool dix, bool dif)
865 {
866 /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
867 static const unsigned int ops[] = { /* wrt dix dif */
868 SCSI_PROT_NORMAL, /* 0 0 0 */
869 SCSI_PROT_READ_STRIP, /* 0 0 1 */
870 SCSI_PROT_READ_INSERT, /* 0 1 0 */
871 SCSI_PROT_READ_PASS, /* 0 1 1 */
872 SCSI_PROT_NORMAL, /* 1 0 0 */
873 SCSI_PROT_WRITE_INSERT, /* 1 0 1 */
874 SCSI_PROT_WRITE_STRIP, /* 1 1 0 */
875 SCSI_PROT_WRITE_PASS, /* 1 1 1 */
876 };
877
878 return ops[write << 2 | dix << 1 | dif];
879 }
880
881 /*
882 * Returns a mask of the protection flags that are valid for a given DIX
883 * operation.
884 */
sd_prot_flag_mask(unsigned int prot_op)885 static unsigned int sd_prot_flag_mask(unsigned int prot_op)
886 {
887 static const unsigned int flag_mask[] = {
888 [SCSI_PROT_NORMAL] = 0,
889
890 [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI |
891 SCSI_PROT_GUARD_CHECK |
892 SCSI_PROT_REF_CHECK |
893 SCSI_PROT_REF_INCREMENT,
894
895 [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT |
896 SCSI_PROT_IP_CHECKSUM,
897
898 [SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI |
899 SCSI_PROT_GUARD_CHECK |
900 SCSI_PROT_REF_CHECK |
901 SCSI_PROT_REF_INCREMENT |
902 SCSI_PROT_IP_CHECKSUM,
903
904 [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI |
905 SCSI_PROT_REF_INCREMENT,
906
907 [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK |
908 SCSI_PROT_REF_CHECK |
909 SCSI_PROT_REF_INCREMENT |
910 SCSI_PROT_IP_CHECKSUM,
911
912 [SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI |
913 SCSI_PROT_GUARD_CHECK |
914 SCSI_PROT_REF_CHECK |
915 SCSI_PROT_REF_INCREMENT |
916 SCSI_PROT_IP_CHECKSUM,
917 };
918
919 return flag_mask[prot_op];
920 }
921
sd_setup_protect_cmnd(struct scsi_cmnd * scmd,unsigned int dix,unsigned int dif)922 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
923 unsigned int dix, unsigned int dif)
924 {
925 struct request *rq = scsi_cmd_to_rq(scmd);
926 struct bio *bio = rq->bio;
927 unsigned int prot_op = sd_prot_op(rq_data_dir(rq), dix, dif);
928 unsigned int protect = 0;
929
930 if (dix) { /* DIX Type 0, 1, 2, 3 */
931 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
932 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
933
934 if (bio_integrity_flagged(bio, BIP_CHECK_GUARD))
935 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
936 }
937
938 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
939 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
940
941 if (bio_integrity_flagged(bio, BIP_CHECK_REFTAG))
942 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
943 }
944
945 if (dif) { /* DIX/DIF Type 1, 2, 3 */
946 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
947
948 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
949 protect = 3 << 5; /* Disable target PI checking */
950 else
951 protect = 1 << 5; /* Enable target PI checking */
952 }
953
954 scsi_set_prot_op(scmd, prot_op);
955 scsi_set_prot_type(scmd, dif);
956 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
957
958 return protect;
959 }
960
sd_set_special_bvec(struct scsi_cmnd * cmd,unsigned int data_len)961 static void *sd_set_special_bvec(struct scsi_cmnd *cmd, unsigned int data_len)
962 {
963 struct page *page;
964 struct request *rq = scsi_cmd_to_rq(cmd);
965 struct scsi_device *sdp = cmd->device;
966 unsigned sector_size = sdp->sector_size;
967 unsigned int nr_pages = DIV_ROUND_UP(sector_size, PAGE_SIZE);
968 int n;
969
970 if (sector_size > PAGE_SIZE)
971 page = mempool_alloc(sd_large_page_pool, GFP_ATOMIC);
972 else
973 page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
974 if (!page)
975 return NULL;
976
977 for (n = 0; n < nr_pages; n++)
978 clear_highpage(page + n);
979 bvec_set_page(&rq->special_vec, page, data_len, 0);
980 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
981 return bvec_virt(&rq->special_vec);
982 }
983
sd_setup_unmap_cmnd(struct scsi_cmnd * cmd)984 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
985 {
986 struct scsi_device *sdp = cmd->device;
987 struct request *rq = scsi_cmd_to_rq(cmd);
988 struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
989 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
990 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
991 unsigned int data_len = 24;
992 char *buf;
993
994 buf = sd_set_special_bvec(cmd, data_len);
995 if (!buf)
996 return BLK_STS_RESOURCE;
997
998 cmd->cmd_len = 10;
999 cmd->cmnd[0] = UNMAP;
1000 cmd->cmnd[8] = 24;
1001
1002 put_unaligned_be16(6 + 16, &buf[0]);
1003 put_unaligned_be16(16, &buf[2]);
1004 put_unaligned_be64(lba, &buf[8]);
1005 put_unaligned_be32(nr_blocks, &buf[16]);
1006
1007 cmd->allowed = sdkp->max_retries;
1008 cmd->transfersize = data_len;
1009 rq->timeout = SD_TIMEOUT;
1010
1011 return scsi_alloc_sgtables(cmd);
1012 }
1013
sd_config_atomic(struct scsi_disk * sdkp,struct queue_limits * lim)1014 static void sd_config_atomic(struct scsi_disk *sdkp, struct queue_limits *lim)
1015 {
1016 unsigned int logical_block_size = sdkp->device->sector_size,
1017 physical_block_size_sectors, max_atomic, unit_min, unit_max;
1018
1019 if ((!sdkp->max_atomic && !sdkp->max_atomic_with_boundary) ||
1020 sdkp->protection_type == T10_PI_TYPE2_PROTECTION)
1021 return;
1022
1023 physical_block_size_sectors = sdkp->physical_block_size /
1024 sdkp->device->sector_size;
1025
1026 unit_min = rounddown_pow_of_two(sdkp->atomic_granularity ?
1027 sdkp->atomic_granularity :
1028 physical_block_size_sectors);
1029
1030 /*
1031 * Only use atomic boundary when we have the odd scenario of
1032 * sdkp->max_atomic == 0, which the spec does permit.
1033 */
1034 if (sdkp->max_atomic) {
1035 max_atomic = sdkp->max_atomic;
1036 unit_max = rounddown_pow_of_two(sdkp->max_atomic);
1037 sdkp->use_atomic_write_boundary = 0;
1038 } else {
1039 max_atomic = sdkp->max_atomic_with_boundary;
1040 unit_max = rounddown_pow_of_two(sdkp->max_atomic_boundary);
1041 sdkp->use_atomic_write_boundary = 1;
1042 }
1043
1044 /*
1045 * Ensure compliance with granularity and alignment. For now, keep it
1046 * simple and just don't support atomic writes for values mismatched
1047 * with max_{boundary}atomic, physical block size, and
1048 * atomic_granularity itself.
1049 *
1050 * We're really being distrustful by checking unit_max also...
1051 */
1052 if (sdkp->atomic_granularity > 1) {
1053 if (unit_min > 1 && unit_min % sdkp->atomic_granularity)
1054 return;
1055 if (unit_max > 1 && unit_max % sdkp->atomic_granularity)
1056 return;
1057 }
1058
1059 if (sdkp->atomic_alignment > 1) {
1060 if (unit_min > 1 && unit_min % sdkp->atomic_alignment)
1061 return;
1062 if (unit_max > 1 && unit_max % sdkp->atomic_alignment)
1063 return;
1064 }
1065
1066 lim->atomic_write_hw_max = max_atomic * logical_block_size;
1067 lim->atomic_write_hw_boundary = 0;
1068 lim->atomic_write_hw_unit_min = unit_min * logical_block_size;
1069 lim->atomic_write_hw_unit_max = unit_max * logical_block_size;
1070 lim->features |= BLK_FEAT_ATOMIC_WRITES;
1071 }
1072
sd_setup_write_same16_cmnd(struct scsi_cmnd * cmd,bool unmap)1073 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
1074 bool unmap)
1075 {
1076 struct scsi_device *sdp = cmd->device;
1077 struct request *rq = scsi_cmd_to_rq(cmd);
1078 struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1079 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1080 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1081 u32 data_len = sdp->sector_size;
1082
1083 if (!sd_set_special_bvec(cmd, data_len))
1084 return BLK_STS_RESOURCE;
1085
1086 cmd->cmd_len = 16;
1087 cmd->cmnd[0] = WRITE_SAME_16;
1088 if (unmap)
1089 cmd->cmnd[1] = 0x8; /* UNMAP */
1090 put_unaligned_be64(lba, &cmd->cmnd[2]);
1091 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1092
1093 cmd->allowed = sdkp->max_retries;
1094 cmd->transfersize = data_len;
1095 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
1096
1097 return scsi_alloc_sgtables(cmd);
1098 }
1099
sd_setup_write_same10_cmnd(struct scsi_cmnd * cmd,bool unmap)1100 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
1101 bool unmap)
1102 {
1103 struct scsi_device *sdp = cmd->device;
1104 struct request *rq = scsi_cmd_to_rq(cmd);
1105 struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1106 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1107 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1108 u32 data_len = sdp->sector_size;
1109
1110 if (!sd_set_special_bvec(cmd, data_len))
1111 return BLK_STS_RESOURCE;
1112
1113 cmd->cmd_len = 10;
1114 cmd->cmnd[0] = WRITE_SAME;
1115 if (unmap)
1116 cmd->cmnd[1] = 0x8; /* UNMAP */
1117 put_unaligned_be32(lba, &cmd->cmnd[2]);
1118 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1119
1120 cmd->allowed = sdkp->max_retries;
1121 cmd->transfersize = data_len;
1122 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
1123
1124 return scsi_alloc_sgtables(cmd);
1125 }
1126
sd_setup_write_zeroes_cmnd(struct scsi_cmnd * cmd)1127 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
1128 {
1129 struct request *rq = scsi_cmd_to_rq(cmd);
1130 struct scsi_device *sdp = cmd->device;
1131 struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1132 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1133 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1134
1135 if (!(rq->cmd_flags & REQ_NOUNMAP)) {
1136 switch (sdkp->zeroing_mode) {
1137 case SD_ZERO_WS16_UNMAP:
1138 return sd_setup_write_same16_cmnd(cmd, true);
1139 case SD_ZERO_WS10_UNMAP:
1140 return sd_setup_write_same10_cmnd(cmd, true);
1141 }
1142 }
1143
1144 if (sdp->no_write_same) {
1145 rq->rq_flags |= RQF_QUIET;
1146 return BLK_STS_TARGET;
1147 }
1148
1149 if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
1150 return sd_setup_write_same16_cmnd(cmd, false);
1151
1152 return sd_setup_write_same10_cmnd(cmd, false);
1153 }
1154
sd_disable_write_same(struct scsi_disk * sdkp)1155 static void sd_disable_write_same(struct scsi_disk *sdkp)
1156 {
1157 sdkp->device->no_write_same = 1;
1158 sdkp->max_ws_blocks = 0;
1159 blk_queue_disable_write_zeroes(sdkp->disk->queue);
1160 }
1161
sd_config_write_same(struct scsi_disk * sdkp,struct queue_limits * lim)1162 static void sd_config_write_same(struct scsi_disk *sdkp,
1163 struct queue_limits *lim)
1164 {
1165 unsigned int logical_block_size = sdkp->device->sector_size;
1166
1167 if (sdkp->device->no_write_same) {
1168 sdkp->max_ws_blocks = 0;
1169 goto out;
1170 }
1171
1172 /* Some devices can not handle block counts above 0xffff despite
1173 * supporting WRITE SAME(16). Consequently we default to 64k
1174 * blocks per I/O unless the device explicitly advertises a
1175 * bigger limit.
1176 */
1177 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
1178 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
1179 (u32)SD_MAX_WS16_BLOCKS);
1180 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
1181 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
1182 (u32)SD_MAX_WS10_BLOCKS);
1183 else {
1184 sdkp->device->no_write_same = 1;
1185 sdkp->max_ws_blocks = 0;
1186 }
1187
1188 if (sdkp->lbprz && sdkp->lbpws)
1189 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
1190 else if (sdkp->lbprz && sdkp->lbpws10)
1191 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
1192 else if (sdkp->max_ws_blocks)
1193 sdkp->zeroing_mode = SD_ZERO_WS;
1194 else
1195 sdkp->zeroing_mode = SD_ZERO_WRITE;
1196
1197 if (sdkp->max_ws_blocks &&
1198 sdkp->physical_block_size > logical_block_size) {
1199 /*
1200 * Reporting a maximum number of blocks that is not aligned
1201 * on the device physical size would cause a large write same
1202 * request to be split into physically unaligned chunks by
1203 * __blkdev_issue_write_zeroes() even if the caller of this
1204 * functions took care to align the large request. So make sure
1205 * the maximum reported is aligned to the device physical block
1206 * size. This is only an optional optimization for regular
1207 * disks, but this is mandatory to avoid failure of large write
1208 * same requests directed at sequential write required zones of
1209 * host-managed ZBC disks.
1210 */
1211 sdkp->max_ws_blocks =
1212 round_down(sdkp->max_ws_blocks,
1213 bytes_to_logical(sdkp->device,
1214 sdkp->physical_block_size));
1215 }
1216
1217 out:
1218 lim->max_write_zeroes_sectors =
1219 sdkp->max_ws_blocks * (logical_block_size >> SECTOR_SHIFT);
1220
1221 if (sdkp->zeroing_mode == SD_ZERO_WS16_UNMAP ||
1222 sdkp->zeroing_mode == SD_ZERO_WS10_UNMAP)
1223 lim->max_hw_wzeroes_unmap_sectors =
1224 lim->max_write_zeroes_sectors;
1225 }
1226
sd_setup_flush_cmnd(struct scsi_cmnd * cmd)1227 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1228 {
1229 struct request *rq = scsi_cmd_to_rq(cmd);
1230 struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1231
1232 /* flush requests don't perform I/O, zero the S/G table */
1233 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1234
1235 if (cmd->device->use_16_for_sync) {
1236 cmd->cmnd[0] = SYNCHRONIZE_CACHE_16;
1237 cmd->cmd_len = 16;
1238 } else {
1239 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1240 cmd->cmd_len = 10;
1241 }
1242 cmd->transfersize = 0;
1243 cmd->allowed = sdkp->max_retries;
1244
1245 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1246 return BLK_STS_OK;
1247 }
1248
1249 /**
1250 * sd_group_number() - Compute the GROUP NUMBER field
1251 * @cmd: SCSI command for which to compute the value of the six-bit GROUP NUMBER
1252 * field.
1253 *
1254 * From SBC-5 r05 (https://www.t10.org/cgi-bin/ac.pl?t=f&f=sbc5r05.pdf):
1255 * 0: no relative lifetime.
1256 * 1: shortest relative lifetime.
1257 * 2: second shortest relative lifetime.
1258 * 3 - 0x3d: intermediate relative lifetimes.
1259 * 0x3e: second longest relative lifetime.
1260 * 0x3f: longest relative lifetime.
1261 */
sd_group_number(struct scsi_cmnd * cmd)1262 static u8 sd_group_number(struct scsi_cmnd *cmd)
1263 {
1264 const struct request *rq = scsi_cmd_to_rq(cmd);
1265 struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1266
1267 if (!sdkp->rscs)
1268 return 0;
1269
1270 return min3((u32)rq->bio->bi_write_hint,
1271 (u32)sdkp->permanent_stream_count, 0x3fu);
1272 }
1273
sd_setup_rw32_cmnd(struct scsi_cmnd * cmd,bool write,sector_t lba,unsigned int nr_blocks,unsigned char flags,unsigned int dld)1274 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1275 sector_t lba, unsigned int nr_blocks,
1276 unsigned char flags, unsigned int dld)
1277 {
1278 cmd->cmd_len = SD_EXT_CDB_SIZE;
1279 cmd->cmnd[0] = VARIABLE_LENGTH_CMD;
1280 cmd->cmnd[6] = sd_group_number(cmd);
1281 cmd->cmnd[7] = 0x18; /* Additional CDB len */
1282 cmd->cmnd[9] = write ? WRITE_32 : READ_32;
1283 cmd->cmnd[10] = flags;
1284 cmd->cmnd[11] = dld & 0x07;
1285 put_unaligned_be64(lba, &cmd->cmnd[12]);
1286 put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
1287 put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
1288
1289 return BLK_STS_OK;
1290 }
1291
sd_setup_rw16_cmnd(struct scsi_cmnd * cmd,bool write,sector_t lba,unsigned int nr_blocks,unsigned char flags,unsigned int dld)1292 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1293 sector_t lba, unsigned int nr_blocks,
1294 unsigned char flags, unsigned int dld)
1295 {
1296 cmd->cmd_len = 16;
1297 cmd->cmnd[0] = write ? WRITE_16 : READ_16;
1298 cmd->cmnd[1] = flags | ((dld >> 2) & 0x01);
1299 cmd->cmnd[14] = ((dld & 0x03) << 6) | sd_group_number(cmd);
1300 cmd->cmnd[15] = 0;
1301 put_unaligned_be64(lba, &cmd->cmnd[2]);
1302 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1303
1304 return BLK_STS_OK;
1305 }
1306
sd_setup_rw10_cmnd(struct scsi_cmnd * cmd,bool write,sector_t lba,unsigned int nr_blocks,unsigned char flags)1307 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1308 sector_t lba, unsigned int nr_blocks,
1309 unsigned char flags)
1310 {
1311 cmd->cmd_len = 10;
1312 cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1313 cmd->cmnd[1] = flags;
1314 cmd->cmnd[6] = sd_group_number(cmd);
1315 cmd->cmnd[9] = 0;
1316 put_unaligned_be32(lba, &cmd->cmnd[2]);
1317 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1318
1319 return BLK_STS_OK;
1320 }
1321
sd_setup_rw6_cmnd(struct scsi_cmnd * cmd,bool write,sector_t lba,unsigned int nr_blocks,unsigned char flags)1322 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1323 sector_t lba, unsigned int nr_blocks,
1324 unsigned char flags)
1325 {
1326 /* Avoid that 0 blocks gets translated into 256 blocks. */
1327 if (WARN_ON_ONCE(nr_blocks == 0))
1328 return BLK_STS_IOERR;
1329
1330 if (unlikely(flags & 0x8)) {
1331 /*
1332 * This happens only if this drive failed 10byte rw
1333 * command with ILLEGAL_REQUEST during operation and
1334 * thus turned off use_10_for_rw.
1335 */
1336 scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1337 return BLK_STS_IOERR;
1338 }
1339
1340 cmd->cmd_len = 6;
1341 cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1342 cmd->cmnd[1] = (lba >> 16) & 0x1f;
1343 cmd->cmnd[2] = (lba >> 8) & 0xff;
1344 cmd->cmnd[3] = lba & 0xff;
1345 cmd->cmnd[4] = nr_blocks;
1346 cmd->cmnd[5] = 0;
1347
1348 return BLK_STS_OK;
1349 }
1350
1351 /*
1352 * Check if a command has a duration limit set. If it does, and the target
1353 * device supports CDL and the feature is enabled, return the limit
1354 * descriptor index to use. Return 0 (no limit) otherwise.
1355 */
sd_cdl_dld(struct scsi_disk * sdkp,struct scsi_cmnd * scmd)1356 static int sd_cdl_dld(struct scsi_disk *sdkp, struct scsi_cmnd *scmd)
1357 {
1358 struct scsi_device *sdp = sdkp->device;
1359 int hint;
1360
1361 if (!sdp->cdl_supported || !sdp->cdl_enable)
1362 return 0;
1363
1364 /*
1365 * Use "no limit" if the request ioprio does not specify a duration
1366 * limit hint.
1367 */
1368 hint = IOPRIO_PRIO_HINT(req_get_ioprio(scsi_cmd_to_rq(scmd)));
1369 if (hint < IOPRIO_HINT_DEV_DURATION_LIMIT_1 ||
1370 hint > IOPRIO_HINT_DEV_DURATION_LIMIT_7)
1371 return 0;
1372
1373 return (hint - IOPRIO_HINT_DEV_DURATION_LIMIT_1) + 1;
1374 }
1375
sd_setup_atomic_cmnd(struct scsi_cmnd * cmd,sector_t lba,unsigned int nr_blocks,bool boundary,unsigned char flags)1376 static blk_status_t sd_setup_atomic_cmnd(struct scsi_cmnd *cmd,
1377 sector_t lba, unsigned int nr_blocks,
1378 bool boundary, unsigned char flags)
1379 {
1380 cmd->cmd_len = 16;
1381 cmd->cmnd[0] = WRITE_ATOMIC_16;
1382 cmd->cmnd[1] = flags;
1383 put_unaligned_be64(lba, &cmd->cmnd[2]);
1384 put_unaligned_be16(nr_blocks, &cmd->cmnd[12]);
1385 if (boundary)
1386 put_unaligned_be16(nr_blocks, &cmd->cmnd[10]);
1387 else
1388 put_unaligned_be16(0, &cmd->cmnd[10]);
1389 put_unaligned_be16(nr_blocks, &cmd->cmnd[12]);
1390 cmd->cmnd[14] = 0;
1391 cmd->cmnd[15] = 0;
1392
1393 return BLK_STS_OK;
1394 }
1395
sd_setup_read_write_cmnd(struct scsi_cmnd * cmd)1396 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1397 {
1398 struct request *rq = scsi_cmd_to_rq(cmd);
1399 struct scsi_device *sdp = cmd->device;
1400 struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1401 sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1402 sector_t threshold;
1403 unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1404 unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1405 bool write = rq_data_dir(rq) == WRITE;
1406 unsigned char protect, fua;
1407 unsigned int dld;
1408 blk_status_t ret;
1409 unsigned int dif;
1410 bool dix;
1411
1412 ret = scsi_alloc_sgtables(cmd);
1413 if (ret != BLK_STS_OK)
1414 return ret;
1415
1416 ret = BLK_STS_IOERR;
1417 if (!scsi_device_online(sdp) || sdp->changed) {
1418 scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1419 goto fail;
1420 }
1421
1422 if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->q->disk)) {
1423 scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1424 goto fail;
1425 }
1426
1427 if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1428 scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1429 goto fail;
1430 }
1431
1432 /*
1433 * Some SD card readers can't handle accesses which touch the
1434 * last one or two logical blocks. Split accesses as needed.
1435 */
1436 threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1437
1438 if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1439 if (lba < threshold) {
1440 /* Access up to the threshold but not beyond */
1441 nr_blocks = threshold - lba;
1442 } else {
1443 /* Access only a single logical block */
1444 nr_blocks = 1;
1445 }
1446 }
1447
1448 fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1449 dix = scsi_prot_sg_count(cmd);
1450 dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
1451 dld = sd_cdl_dld(sdkp, cmd);
1452
1453 if (dif || dix)
1454 protect = sd_setup_protect_cmnd(cmd, dix, dif);
1455 else
1456 protect = 0;
1457
1458 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1459 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1460 protect | fua, dld);
1461 } else if (rq->cmd_flags & REQ_ATOMIC) {
1462 ret = sd_setup_atomic_cmnd(cmd, lba, nr_blocks,
1463 sdkp->use_atomic_write_boundary,
1464 protect | fua);
1465 } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1466 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1467 protect | fua, dld);
1468 } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1469 sdp->use_10_for_rw || protect || rq->bio->bi_write_hint) {
1470 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1471 protect | fua);
1472 } else {
1473 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1474 protect | fua);
1475 }
1476
1477 if (unlikely(ret != BLK_STS_OK))
1478 goto fail;
1479
1480 /*
1481 * We shouldn't disconnect in the middle of a sector, so with a dumb
1482 * host adapter, it's safe to assume that we can at least transfer
1483 * this many bytes between each connect / disconnect.
1484 */
1485 cmd->transfersize = sdp->sector_size;
1486 cmd->underflow = nr_blocks << 9;
1487 cmd->allowed = sdkp->max_retries;
1488 cmd->sdb.length = nr_blocks * sdp->sector_size;
1489
1490 SCSI_LOG_HLQUEUE(1,
1491 scmd_printk(KERN_INFO, cmd,
1492 "%s: block=%llu, count=%d\n", __func__,
1493 (unsigned long long)blk_rq_pos(rq),
1494 blk_rq_sectors(rq)));
1495 SCSI_LOG_HLQUEUE(2,
1496 scmd_printk(KERN_INFO, cmd,
1497 "%s %d/%u 512 byte blocks.\n",
1498 write ? "writing" : "reading", nr_blocks,
1499 blk_rq_sectors(rq)));
1500
1501 /*
1502 * This indicates that the command is ready from our end to be queued.
1503 */
1504 return BLK_STS_OK;
1505 fail:
1506 scsi_free_sgtables(cmd);
1507 return ret;
1508 }
1509
sd_init_command(struct scsi_cmnd * cmd)1510 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1511 {
1512 struct request *rq = scsi_cmd_to_rq(cmd);
1513
1514 switch (req_op(rq)) {
1515 case REQ_OP_DISCARD:
1516 switch (scsi_disk(rq->q->disk)->provisioning_mode) {
1517 case SD_LBP_UNMAP:
1518 return sd_setup_unmap_cmnd(cmd);
1519 case SD_LBP_WS16:
1520 return sd_setup_write_same16_cmnd(cmd, true);
1521 case SD_LBP_WS10:
1522 return sd_setup_write_same10_cmnd(cmd, true);
1523 case SD_LBP_ZERO:
1524 return sd_setup_write_same10_cmnd(cmd, false);
1525 default:
1526 return BLK_STS_TARGET;
1527 }
1528 case REQ_OP_WRITE_ZEROES:
1529 return sd_setup_write_zeroes_cmnd(cmd);
1530 case REQ_OP_FLUSH:
1531 return sd_setup_flush_cmnd(cmd);
1532 case REQ_OP_READ:
1533 case REQ_OP_WRITE:
1534 return sd_setup_read_write_cmnd(cmd);
1535 case REQ_OP_ZONE_RESET:
1536 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1537 false);
1538 case REQ_OP_ZONE_RESET_ALL:
1539 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1540 true);
1541 case REQ_OP_ZONE_OPEN:
1542 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false);
1543 case REQ_OP_ZONE_CLOSE:
1544 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false);
1545 case REQ_OP_ZONE_FINISH:
1546 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false);
1547 default:
1548 WARN_ON_ONCE(1);
1549 return BLK_STS_NOTSUPP;
1550 }
1551 }
1552
sd_uninit_command(struct scsi_cmnd * SCpnt)1553 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1554 {
1555 struct request *rq = scsi_cmd_to_rq(SCpnt);
1556 struct scsi_device *sdp = SCpnt->device;
1557 unsigned sector_size = sdp->sector_size;
1558
1559 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) {
1560 if (sector_size > PAGE_SIZE)
1561 mempool_free(rq->special_vec.bv_page, sd_large_page_pool);
1562 else
1563 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1564 }
1565 }
1566
sd_need_revalidate(struct gendisk * disk,struct scsi_disk * sdkp)1567 static bool sd_need_revalidate(struct gendisk *disk, struct scsi_disk *sdkp)
1568 {
1569 if (sdkp->device->removable || sdkp->write_prot) {
1570 if (disk_check_media_change(disk))
1571 return true;
1572 }
1573
1574 /*
1575 * Force a full rescan after ioctl(BLKRRPART). While the disk state has
1576 * nothing to do with partitions, BLKRRPART is used to force a full
1577 * revalidate after things like a format for historical reasons.
1578 */
1579 return test_bit(GD_NEED_PART_SCAN, &disk->state);
1580 }
1581
1582 /**
1583 * sd_open - open a scsi disk device
1584 * @disk: disk to open
1585 * @mode: open mode
1586 *
1587 * Returns 0 if successful. Returns a negated errno value in case
1588 * of error.
1589 *
1590 * Note: This can be called from a user context (e.g. fsck(1) )
1591 * or from within the kernel (e.g. as a result of a mount(1) ).
1592 * In the latter case @inode and @filp carry an abridged amount
1593 * of information as noted above.
1594 *
1595 * Locking: called with disk->open_mutex held.
1596 **/
sd_open(struct gendisk * disk,blk_mode_t mode)1597 static int sd_open(struct gendisk *disk, blk_mode_t mode)
1598 {
1599 struct scsi_disk *sdkp = scsi_disk(disk);
1600 struct scsi_device *sdev = sdkp->device;
1601 int retval;
1602
1603 if (scsi_device_get(sdev))
1604 return -ENXIO;
1605
1606 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1607
1608 /*
1609 * If the device is in error recovery, wait until it is done.
1610 * If the device is offline, then disallow any access to it.
1611 */
1612 retval = -ENXIO;
1613 if (!scsi_block_when_processing_errors(sdev))
1614 goto error_out;
1615
1616 if (sd_need_revalidate(disk, sdkp))
1617 sd_revalidate_disk(disk);
1618
1619 /*
1620 * If the drive is empty, just let the open fail.
1621 */
1622 retval = -ENOMEDIUM;
1623 if (sdev->removable && !sdkp->media_present &&
1624 !(mode & BLK_OPEN_NDELAY))
1625 goto error_out;
1626
1627 /*
1628 * If the device has the write protect tab set, have the open fail
1629 * if the user expects to be able to write to the thing.
1630 */
1631 retval = -EROFS;
1632 if (sdkp->write_prot && (mode & BLK_OPEN_WRITE))
1633 goto error_out;
1634
1635 /*
1636 * It is possible that the disk changing stuff resulted in
1637 * the device being taken offline. If this is the case,
1638 * report this to the user, and don't pretend that the
1639 * open actually succeeded.
1640 */
1641 retval = -ENXIO;
1642 if (!scsi_device_online(sdev))
1643 goto error_out;
1644
1645 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1646 if (scsi_block_when_processing_errors(sdev))
1647 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1648 }
1649
1650 return 0;
1651
1652 error_out:
1653 scsi_device_put(sdev);
1654 return retval;
1655 }
1656
1657 /**
1658 * sd_release - invoked when the (last) close(2) is called on this
1659 * scsi disk.
1660 * @disk: disk to release
1661 *
1662 * Returns 0.
1663 *
1664 * Note: may block (uninterruptible) if error recovery is underway
1665 * on this disk.
1666 *
1667 * Locking: called with disk->open_mutex held.
1668 **/
sd_release(struct gendisk * disk)1669 static void sd_release(struct gendisk *disk)
1670 {
1671 struct scsi_disk *sdkp = scsi_disk(disk);
1672 struct scsi_device *sdev = sdkp->device;
1673
1674 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1675
1676 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1677 if (scsi_block_when_processing_errors(sdev))
1678 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1679 }
1680
1681 scsi_device_put(sdev);
1682 }
1683
sd_getgeo(struct gendisk * disk,struct hd_geometry * geo)1684 static int sd_getgeo(struct gendisk *disk, struct hd_geometry *geo)
1685 {
1686 struct scsi_disk *sdkp = scsi_disk(disk);
1687 struct scsi_device *sdp = sdkp->device;
1688 struct Scsi_Host *host = sdp->host;
1689 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1690 int diskinfo[4];
1691
1692 /* default to most commonly used values */
1693 diskinfo[0] = 0x40; /* 1 << 6 */
1694 diskinfo[1] = 0x20; /* 1 << 5 */
1695 diskinfo[2] = capacity >> 11;
1696
1697 /* override with calculated, extended default, or driver values */
1698 if (host->hostt->bios_param)
1699 host->hostt->bios_param(sdp, disk, capacity, diskinfo);
1700 else
1701 scsicam_bios_param(disk, capacity, diskinfo);
1702
1703 geo->heads = diskinfo[0];
1704 geo->sectors = diskinfo[1];
1705 geo->cylinders = diskinfo[2];
1706 return 0;
1707 }
1708
1709 /**
1710 * sd_ioctl - process an ioctl
1711 * @bdev: target block device
1712 * @mode: open mode
1713 * @cmd: ioctl command number
1714 * @arg: this is third argument given to ioctl(2) system call.
1715 * Often contains a pointer.
1716 *
1717 * Returns 0 if successful (some ioctls return positive numbers on
1718 * success as well). Returns a negated errno value in case of error.
1719 *
1720 * Note: most ioctls are forward onto the block subsystem or further
1721 * down in the scsi subsystem.
1722 **/
sd_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long arg)1723 static int sd_ioctl(struct block_device *bdev, blk_mode_t mode,
1724 unsigned int cmd, unsigned long arg)
1725 {
1726 struct gendisk *disk = bdev->bd_disk;
1727 struct scsi_disk *sdkp = scsi_disk(disk);
1728 struct scsi_device *sdp = sdkp->device;
1729 void __user *p = (void __user *)arg;
1730 int error;
1731
1732 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp,
1733 "sd_ioctl: disk=%s, cmd=0x%x\n",
1734 disk->disk_name, cmd));
1735
1736 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
1737 return -ENOIOCTLCMD;
1738
1739 /*
1740 * If we are in the middle of error recovery, don't let anyone
1741 * else try and use this device. Also, if error recovery fails, it
1742 * may try and take the device offline, in which case all further
1743 * access to the device is prohibited.
1744 */
1745 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1746 (mode & BLK_OPEN_NDELAY));
1747 if (error)
1748 return error;
1749
1750 if (is_sed_ioctl(cmd))
1751 return sed_ioctl(sdkp->opal_dev, cmd, p);
1752 return scsi_ioctl(sdp, mode & BLK_OPEN_WRITE, cmd, p);
1753 }
1754
set_media_not_present(struct scsi_disk * sdkp)1755 static void set_media_not_present(struct scsi_disk *sdkp)
1756 {
1757 if (sdkp->media_present)
1758 sdkp->device->changed = 1;
1759
1760 if (sdkp->device->removable) {
1761 sdkp->media_present = 0;
1762 sdkp->capacity = 0;
1763 }
1764 }
1765
media_not_present(struct scsi_disk * sdkp,struct scsi_sense_hdr * sshdr)1766 static int media_not_present(struct scsi_disk *sdkp,
1767 struct scsi_sense_hdr *sshdr)
1768 {
1769 if (!scsi_sense_valid(sshdr))
1770 return 0;
1771
1772 /* not invoked for commands that could return deferred errors */
1773 switch (sshdr->sense_key) {
1774 case UNIT_ATTENTION:
1775 case NOT_READY:
1776 /* medium not present */
1777 if (sshdr->asc == 0x3A) {
1778 set_media_not_present(sdkp);
1779 return 1;
1780 }
1781 }
1782 return 0;
1783 }
1784
1785 /**
1786 * sd_check_events - check media events
1787 * @disk: kernel device descriptor
1788 * @clearing: disk events currently being cleared
1789 *
1790 * Returns mask of DISK_EVENT_*.
1791 *
1792 * Note: this function is invoked from the block subsystem.
1793 **/
sd_check_events(struct gendisk * disk,unsigned int clearing)1794 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1795 {
1796 struct scsi_disk *sdkp = disk->private_data;
1797 struct scsi_device *sdp;
1798 int retval;
1799 bool disk_changed;
1800
1801 if (!sdkp)
1802 return 0;
1803
1804 sdp = sdkp->device;
1805 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1806
1807 /*
1808 * If the device is offline, don't send any commands - just pretend as
1809 * if the command failed. If the device ever comes back online, we
1810 * can deal with it then. It is only because of unrecoverable errors
1811 * that we would ever take a device offline in the first place.
1812 */
1813 if (!scsi_device_online(sdp)) {
1814 set_media_not_present(sdkp);
1815 goto out;
1816 }
1817
1818 /*
1819 * Using TEST_UNIT_READY enables differentiation between drive with
1820 * no cartridge loaded - NOT READY, drive with changed cartridge -
1821 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1822 *
1823 * Drives that auto spin down. eg iomega jaz 1G, will be started
1824 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1825 * sd_revalidate() is called.
1826 */
1827 if (scsi_block_when_processing_errors(sdp)) {
1828 struct scsi_sense_hdr sshdr = { 0, };
1829
1830 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, sdkp->max_retries,
1831 &sshdr);
1832
1833 /* failed to execute TUR, assume media not present */
1834 if (retval < 0 || host_byte(retval)) {
1835 set_media_not_present(sdkp);
1836 goto out;
1837 }
1838
1839 if (media_not_present(sdkp, &sshdr))
1840 goto out;
1841 }
1842
1843 /*
1844 * For removable scsi disk we have to recognise the presence
1845 * of a disk in the drive.
1846 */
1847 if (!sdkp->media_present)
1848 sdp->changed = 1;
1849 sdkp->media_present = 1;
1850 out:
1851 /*
1852 * sdp->changed is set under the following conditions:
1853 *
1854 * Medium present state has changed in either direction.
1855 * Device has indicated UNIT_ATTENTION.
1856 */
1857 disk_changed = sdp->changed;
1858 sdp->changed = 0;
1859 return disk_changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1860 }
1861
sd_sync_cache(struct scsi_disk * sdkp)1862 static int sd_sync_cache(struct scsi_disk *sdkp)
1863 {
1864 int res;
1865 struct scsi_device *sdp = sdkp->device;
1866 const int timeout = sdp->request_queue->rq_timeout
1867 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1868 /* Leave the rest of the command zero to indicate flush everything. */
1869 const unsigned char cmd[16] = { sdp->use_16_for_sync ?
1870 SYNCHRONIZE_CACHE_16 : SYNCHRONIZE_CACHE };
1871 struct scsi_sense_hdr sshdr;
1872 struct scsi_failure failure_defs[] = {
1873 {
1874 .allowed = 3,
1875 .result = SCMD_FAILURE_RESULT_ANY,
1876 },
1877 {}
1878 };
1879 struct scsi_failures failures = {
1880 .failure_definitions = failure_defs,
1881 };
1882 const struct scsi_exec_args exec_args = {
1883 .req_flags = BLK_MQ_REQ_PM,
1884 .sshdr = &sshdr,
1885 .failures = &failures,
1886 };
1887
1888 if (!scsi_device_online(sdp))
1889 return -ENODEV;
1890
1891 res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, timeout,
1892 sdkp->max_retries, &exec_args);
1893 if (res) {
1894 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1895
1896 if (res < 0)
1897 return res;
1898
1899 if (scsi_status_is_check_condition(res) &&
1900 scsi_sense_valid(&sshdr)) {
1901 sd_print_sense_hdr(sdkp, &sshdr);
1902
1903 /* we need to evaluate the error return */
1904 if (sshdr.asc == 0x3a || /* medium not present */
1905 sshdr.asc == 0x20 || /* invalid command */
1906 (sshdr.asc == 0x74 && sshdr.ascq == 0x71)) /* drive is password locked */
1907 /* this is no error here */
1908 return 0;
1909
1910 /*
1911 * If a format is in progress or if the drive does not
1912 * support sync, there is not much we can do because
1913 * this is called during shutdown or suspend so just
1914 * return success so those operations can proceed.
1915 */
1916 if ((sshdr.asc == 0x04 && sshdr.ascq == 0x04) ||
1917 sshdr.sense_key == ILLEGAL_REQUEST)
1918 return 0;
1919 }
1920
1921 switch (host_byte(res)) {
1922 /* ignore errors due to racing a disconnection */
1923 case DID_BAD_TARGET:
1924 case DID_NO_CONNECT:
1925 return 0;
1926 /* signal the upper layer it might try again */
1927 case DID_BUS_BUSY:
1928 case DID_IMM_RETRY:
1929 case DID_REQUEUE:
1930 case DID_SOFT_ERROR:
1931 return -EBUSY;
1932 default:
1933 return -EIO;
1934 }
1935 }
1936 return 0;
1937 }
1938
sd_rescan(struct device * dev)1939 static void sd_rescan(struct device *dev)
1940 {
1941 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1942
1943 sd_revalidate_disk(sdkp->disk);
1944 }
1945
sd_get_unique_id(struct gendisk * disk,u8 id[16],enum blk_unique_id type)1946 static int sd_get_unique_id(struct gendisk *disk, u8 id[16],
1947 enum blk_unique_id type)
1948 {
1949 struct scsi_device *sdev = scsi_disk(disk)->device;
1950 const struct scsi_vpd *vpd;
1951 const unsigned char *d;
1952 int ret = -ENXIO, len;
1953
1954 rcu_read_lock();
1955 vpd = rcu_dereference(sdev->vpd_pg83);
1956 if (!vpd)
1957 goto out_unlock;
1958
1959 ret = -EINVAL;
1960 for (d = vpd->data + 4; d < vpd->data + vpd->len; d += d[3] + 4) {
1961 /* we only care about designators with LU association */
1962 if (((d[1] >> 4) & 0x3) != 0x00)
1963 continue;
1964 if ((d[1] & 0xf) != type)
1965 continue;
1966
1967 /*
1968 * Only exit early if a 16-byte descriptor was found. Otherwise
1969 * keep looking as one with more entropy might still show up.
1970 */
1971 len = d[3];
1972 if (len != 8 && len != 12 && len != 16)
1973 continue;
1974 ret = len;
1975 memcpy(id, d + 4, len);
1976 if (len == 16)
1977 break;
1978 }
1979 out_unlock:
1980 rcu_read_unlock();
1981 return ret;
1982 }
1983
sd_scsi_to_pr_err(struct scsi_sense_hdr * sshdr,int result)1984 static int sd_scsi_to_pr_err(struct scsi_sense_hdr *sshdr, int result)
1985 {
1986 switch (host_byte(result)) {
1987 case DID_TRANSPORT_MARGINAL:
1988 case DID_TRANSPORT_DISRUPTED:
1989 case DID_BUS_BUSY:
1990 return PR_STS_RETRY_PATH_FAILURE;
1991 case DID_NO_CONNECT:
1992 return PR_STS_PATH_FAILED;
1993 case DID_TRANSPORT_FAILFAST:
1994 return PR_STS_PATH_FAST_FAILED;
1995 }
1996
1997 switch (status_byte(result)) {
1998 case SAM_STAT_RESERVATION_CONFLICT:
1999 return PR_STS_RESERVATION_CONFLICT;
2000 case SAM_STAT_CHECK_CONDITION:
2001 if (!scsi_sense_valid(sshdr))
2002 return PR_STS_IOERR;
2003
2004 if (sshdr->sense_key == ILLEGAL_REQUEST &&
2005 (sshdr->asc == 0x26 || sshdr->asc == 0x24))
2006 return -EINVAL;
2007
2008 fallthrough;
2009 default:
2010 return PR_STS_IOERR;
2011 }
2012 }
2013
sd_pr_in_command(struct block_device * bdev,u8 sa,unsigned char * data,int data_len)2014 static int sd_pr_in_command(struct block_device *bdev, u8 sa,
2015 unsigned char *data, int data_len)
2016 {
2017 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
2018 struct scsi_device *sdev = sdkp->device;
2019 struct scsi_sense_hdr sshdr;
2020 u8 cmd[10] = { PERSISTENT_RESERVE_IN, sa };
2021 struct scsi_failure failure_defs[] = {
2022 {
2023 .sense = UNIT_ATTENTION,
2024 .asc = SCMD_FAILURE_ASC_ANY,
2025 .ascq = SCMD_FAILURE_ASCQ_ANY,
2026 .allowed = 5,
2027 .result = SAM_STAT_CHECK_CONDITION,
2028 },
2029 {}
2030 };
2031 struct scsi_failures failures = {
2032 .failure_definitions = failure_defs,
2033 };
2034 const struct scsi_exec_args exec_args = {
2035 .sshdr = &sshdr,
2036 .failures = &failures,
2037 };
2038 int result;
2039
2040 put_unaligned_be16(data_len, &cmd[7]);
2041
2042 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, data, data_len,
2043 SD_TIMEOUT, sdkp->max_retries, &exec_args);
2044 if (scsi_status_is_check_condition(result) &&
2045 scsi_sense_valid(&sshdr)) {
2046 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
2047 scsi_print_sense_hdr(sdev, NULL, &sshdr);
2048 }
2049
2050 if (result <= 0)
2051 return result;
2052
2053 return sd_scsi_to_pr_err(&sshdr, result);
2054 }
2055
sd_pr_read_keys(struct block_device * bdev,struct pr_keys * keys_info)2056 static int sd_pr_read_keys(struct block_device *bdev, struct pr_keys *keys_info)
2057 {
2058 int result, i, data_offset, num_copy_keys;
2059 u32 num_keys = keys_info->num_keys;
2060 int data_len;
2061 u8 *data;
2062
2063 /*
2064 * Each reservation key takes 8 bytes and there is an 8-byte header
2065 * before the reservation key list. The total size must fit into the
2066 * 16-bit ALLOCATION LENGTH field.
2067 */
2068 if (check_mul_overflow(num_keys, 8, &data_len) ||
2069 check_add_overflow(data_len, 8, &data_len) ||
2070 data_len > USHRT_MAX)
2071 return -EINVAL;
2072
2073 data = kzalloc(data_len, GFP_KERNEL);
2074 if (!data)
2075 return -ENOMEM;
2076
2077 result = sd_pr_in_command(bdev, READ_KEYS, data, data_len);
2078 if (result)
2079 goto free_data;
2080
2081 keys_info->generation = get_unaligned_be32(&data[0]);
2082 keys_info->num_keys = get_unaligned_be32(&data[4]) / 8;
2083
2084 data_offset = 8;
2085 num_copy_keys = min(num_keys, keys_info->num_keys);
2086
2087 for (i = 0; i < num_copy_keys; i++) {
2088 keys_info->keys[i] = get_unaligned_be64(&data[data_offset]);
2089 data_offset += 8;
2090 }
2091
2092 free_data:
2093 kfree(data);
2094 return result;
2095 }
2096
sd_pr_read_reservation(struct block_device * bdev,struct pr_held_reservation * rsv)2097 static int sd_pr_read_reservation(struct block_device *bdev,
2098 struct pr_held_reservation *rsv)
2099 {
2100 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
2101 struct scsi_device *sdev = sdkp->device;
2102 u8 data[24] = { };
2103 int result, len;
2104
2105 result = sd_pr_in_command(bdev, READ_RESERVATION, data, sizeof(data));
2106 if (result)
2107 return result;
2108
2109 len = get_unaligned_be32(&data[4]);
2110 if (!len)
2111 return 0;
2112
2113 /* Make sure we have at least the key and type */
2114 if (len < 14) {
2115 sdev_printk(KERN_INFO, sdev,
2116 "READ RESERVATION failed due to short return buffer of %d bytes\n",
2117 len);
2118 return -EINVAL;
2119 }
2120
2121 rsv->generation = get_unaligned_be32(&data[0]);
2122 rsv->key = get_unaligned_be64(&data[8]);
2123 rsv->type = scsi_pr_type_to_block(data[21] & 0x0f);
2124 return 0;
2125 }
2126
sd_pr_out_command(struct block_device * bdev,u8 sa,u64 key,u64 sa_key,enum scsi_pr_type type,u8 flags)2127 static int sd_pr_out_command(struct block_device *bdev, u8 sa, u64 key,
2128 u64 sa_key, enum scsi_pr_type type, u8 flags)
2129 {
2130 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
2131 struct scsi_device *sdev = sdkp->device;
2132 struct scsi_sense_hdr sshdr;
2133 struct scsi_failure failure_defs[] = {
2134 {
2135 .sense = UNIT_ATTENTION,
2136 .asc = SCMD_FAILURE_ASC_ANY,
2137 .ascq = SCMD_FAILURE_ASCQ_ANY,
2138 .allowed = 5,
2139 .result = SAM_STAT_CHECK_CONDITION,
2140 },
2141 {}
2142 };
2143 struct scsi_failures failures = {
2144 .failure_definitions = failure_defs,
2145 };
2146 const struct scsi_exec_args exec_args = {
2147 .sshdr = &sshdr,
2148 .failures = &failures,
2149 };
2150 int result;
2151 u8 cmd[16] = { 0, };
2152 u8 data[24] = { 0, };
2153
2154 cmd[0] = PERSISTENT_RESERVE_OUT;
2155 cmd[1] = sa;
2156 cmd[2] = type;
2157 put_unaligned_be32(sizeof(data), &cmd[5]);
2158
2159 put_unaligned_be64(key, &data[0]);
2160 put_unaligned_be64(sa_key, &data[8]);
2161 data[20] = flags;
2162
2163 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_OUT, &data,
2164 sizeof(data), SD_TIMEOUT, sdkp->max_retries,
2165 &exec_args);
2166
2167 if (scsi_status_is_check_condition(result) &&
2168 scsi_sense_valid(&sshdr)) {
2169 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
2170 scsi_print_sense_hdr(sdev, NULL, &sshdr);
2171 }
2172
2173 if (result <= 0)
2174 return result;
2175
2176 return sd_scsi_to_pr_err(&sshdr, result);
2177 }
2178
sd_pr_register(struct block_device * bdev,u64 old_key,u64 new_key,u32 flags)2179 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
2180 u32 flags)
2181 {
2182 if (flags & ~PR_FL_IGNORE_KEY)
2183 return -EOPNOTSUPP;
2184 return sd_pr_out_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
2185 old_key, new_key, 0,
2186 (1 << 0) /* APTPL */);
2187 }
2188
sd_pr_reserve(struct block_device * bdev,u64 key,enum pr_type type,u32 flags)2189 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
2190 u32 flags)
2191 {
2192 if (flags)
2193 return -EOPNOTSUPP;
2194 return sd_pr_out_command(bdev, 0x01, key, 0,
2195 block_pr_type_to_scsi(type), 0);
2196 }
2197
sd_pr_release(struct block_device * bdev,u64 key,enum pr_type type)2198 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
2199 {
2200 return sd_pr_out_command(bdev, 0x02, key, 0,
2201 block_pr_type_to_scsi(type), 0);
2202 }
2203
sd_pr_preempt(struct block_device * bdev,u64 old_key,u64 new_key,enum pr_type type,bool abort)2204 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
2205 enum pr_type type, bool abort)
2206 {
2207 return sd_pr_out_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
2208 block_pr_type_to_scsi(type), 0);
2209 }
2210
sd_pr_clear(struct block_device * bdev,u64 key)2211 static int sd_pr_clear(struct block_device *bdev, u64 key)
2212 {
2213 return sd_pr_out_command(bdev, 0x03, key, 0, 0, 0);
2214 }
2215
2216 static const struct pr_ops sd_pr_ops = {
2217 .pr_register = sd_pr_register,
2218 .pr_reserve = sd_pr_reserve,
2219 .pr_release = sd_pr_release,
2220 .pr_preempt = sd_pr_preempt,
2221 .pr_clear = sd_pr_clear,
2222 .pr_read_keys = sd_pr_read_keys,
2223 .pr_read_reservation = sd_pr_read_reservation,
2224 };
2225
scsi_disk_free_disk(struct gendisk * disk)2226 static void scsi_disk_free_disk(struct gendisk *disk)
2227 {
2228 struct scsi_disk *sdkp = scsi_disk(disk);
2229
2230 put_device(&sdkp->disk_dev);
2231 }
2232
2233 /**
2234 * sd_eh_reset - reset error handling callback
2235 * @scmd: sd-issued command that has failed
2236 *
2237 * This function is called by the SCSI midlayer before starting
2238 * SCSI EH. When counting medium access failures we have to be
2239 * careful to register it only only once per device and SCSI EH run;
2240 * there might be several timed out commands which will cause the
2241 * 'max_medium_access_timeouts' counter to trigger after the first
2242 * SCSI EH run already and set the device to offline.
2243 * So this function resets the internal counter before starting SCSI EH.
2244 **/
sd_eh_reset(struct scsi_cmnd * scmd)2245 static void sd_eh_reset(struct scsi_cmnd *scmd)
2246 {
2247 struct scsi_disk *sdkp = scsi_disk(scsi_cmd_to_rq(scmd)->q->disk);
2248
2249 /* New SCSI EH run, reset gate variable */
2250 sdkp->ignore_medium_access_errors = false;
2251 }
2252
2253 /**
2254 * sd_eh_action - error handling callback
2255 * @scmd: sd-issued command that has failed
2256 * @eh_disp: The recovery disposition suggested by the midlayer
2257 *
2258 * This function is called by the SCSI midlayer upon completion of an
2259 * error test command (currently TEST UNIT READY). The result of sending
2260 * the eh command is passed in eh_disp. We're looking for devices that
2261 * fail medium access commands but are OK with non access commands like
2262 * test unit ready (so wrongly see the device as having a successful
2263 * recovery)
2264 **/
sd_eh_action(struct scsi_cmnd * scmd,int eh_disp)2265 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
2266 {
2267 struct scsi_disk *sdkp = scsi_disk(scsi_cmd_to_rq(scmd)->q->disk);
2268 struct scsi_device *sdev = scmd->device;
2269
2270 if (!scsi_device_online(sdev) ||
2271 !scsi_medium_access_command(scmd) ||
2272 host_byte(scmd->result) != DID_TIME_OUT ||
2273 eh_disp != SUCCESS)
2274 return eh_disp;
2275
2276 /*
2277 * The device has timed out executing a medium access command.
2278 * However, the TEST UNIT READY command sent during error
2279 * handling completed successfully. Either the device is in the
2280 * process of recovering or has it suffered an internal failure
2281 * that prevents access to the storage medium.
2282 */
2283 if (!sdkp->ignore_medium_access_errors) {
2284 sdkp->medium_access_timed_out++;
2285 sdkp->ignore_medium_access_errors = true;
2286 }
2287
2288 /*
2289 * If the device keeps failing read/write commands but TEST UNIT
2290 * READY always completes successfully we assume that medium
2291 * access is no longer possible and take the device offline.
2292 */
2293 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
2294 scmd_printk(KERN_ERR, scmd,
2295 "Medium access timeout failure. Offlining disk!\n");
2296 mutex_lock(&sdev->state_mutex);
2297 scsi_device_set_state(sdev, SDEV_OFFLINE);
2298 mutex_unlock(&sdev->state_mutex);
2299
2300 return SUCCESS;
2301 }
2302
2303 return eh_disp;
2304 }
2305
sd_completed_bytes(struct scsi_cmnd * scmd)2306 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
2307 {
2308 struct request *req = scsi_cmd_to_rq(scmd);
2309 struct scsi_device *sdev = scmd->device;
2310 unsigned int transferred, good_bytes;
2311 u64 start_lba, end_lba, bad_lba;
2312
2313 /*
2314 * Some commands have a payload smaller than the device logical
2315 * block size (e.g. INQUIRY on a 4K disk).
2316 */
2317 if (scsi_bufflen(scmd) <= sdev->sector_size)
2318 return 0;
2319
2320 /* Check if we have a 'bad_lba' information */
2321 if (!scsi_get_sense_info_fld(scmd->sense_buffer,
2322 SCSI_SENSE_BUFFERSIZE,
2323 &bad_lba))
2324 return 0;
2325
2326 /*
2327 * If the bad lba was reported incorrectly, we have no idea where
2328 * the error is.
2329 */
2330 start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
2331 end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
2332 if (bad_lba < start_lba || bad_lba >= end_lba)
2333 return 0;
2334
2335 /*
2336 * resid is optional but mostly filled in. When it's unused,
2337 * its value is zero, so we assume the whole buffer transferred
2338 */
2339 transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
2340
2341 /* This computation should always be done in terms of the
2342 * resolution of the device's medium.
2343 */
2344 good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
2345
2346 return min(good_bytes, transferred);
2347 }
2348
2349 /**
2350 * sd_done - bottom half handler: called when the lower level
2351 * driver has completed (successfully or otherwise) a scsi command.
2352 * @SCpnt: mid-level's per command structure.
2353 *
2354 * Note: potentially run from within an ISR. Must not block.
2355 **/
sd_done(struct scsi_cmnd * SCpnt)2356 static int sd_done(struct scsi_cmnd *SCpnt)
2357 {
2358 int result = SCpnt->result;
2359 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
2360 unsigned int sector_size = SCpnt->device->sector_size;
2361 unsigned int resid;
2362 struct scsi_sense_hdr sshdr;
2363 struct request *req = scsi_cmd_to_rq(SCpnt);
2364 struct scsi_disk *sdkp = scsi_disk(req->q->disk);
2365 int sense_valid = 0;
2366 int sense_deferred = 0;
2367
2368 switch (req_op(req)) {
2369 case REQ_OP_DISCARD:
2370 case REQ_OP_WRITE_ZEROES:
2371 case REQ_OP_ZONE_RESET:
2372 case REQ_OP_ZONE_RESET_ALL:
2373 case REQ_OP_ZONE_OPEN:
2374 case REQ_OP_ZONE_CLOSE:
2375 case REQ_OP_ZONE_FINISH:
2376 if (!result) {
2377 good_bytes = blk_rq_bytes(req);
2378 scsi_set_resid(SCpnt, 0);
2379 } else {
2380 good_bytes = 0;
2381 scsi_set_resid(SCpnt, blk_rq_bytes(req));
2382 }
2383 break;
2384 default:
2385 /*
2386 * In case of bogus fw or device, we could end up having
2387 * an unaligned partial completion. Check this here and force
2388 * alignment.
2389 */
2390 resid = scsi_get_resid(SCpnt);
2391 if (resid & (sector_size - 1)) {
2392 sd_printk(KERN_INFO, sdkp,
2393 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
2394 resid, sector_size);
2395 scsi_print_command(SCpnt);
2396 resid = min(scsi_bufflen(SCpnt),
2397 round_up(resid, sector_size));
2398 scsi_set_resid(SCpnt, resid);
2399 }
2400 }
2401
2402 if (result) {
2403 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
2404 if (sense_valid)
2405 sense_deferred = scsi_sense_is_deferred(&sshdr);
2406 }
2407 sdkp->medium_access_timed_out = 0;
2408
2409 if (!scsi_status_is_check_condition(result) &&
2410 (!sense_valid || sense_deferred))
2411 goto out;
2412
2413 switch (sshdr.sense_key) {
2414 case HARDWARE_ERROR:
2415 case MEDIUM_ERROR:
2416 good_bytes = sd_completed_bytes(SCpnt);
2417 break;
2418 case RECOVERED_ERROR:
2419 good_bytes = scsi_bufflen(SCpnt);
2420 break;
2421 case NO_SENSE:
2422 /* This indicates a false check condition, so ignore it. An
2423 * unknown amount of data was transferred so treat it as an
2424 * error.
2425 */
2426 SCpnt->result = 0;
2427 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2428 break;
2429 case ABORTED_COMMAND:
2430 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
2431 good_bytes = sd_completed_bytes(SCpnt);
2432 break;
2433 case ILLEGAL_REQUEST:
2434 switch (sshdr.asc) {
2435 case 0x10: /* DIX: Host detected corruption */
2436 good_bytes = sd_completed_bytes(SCpnt);
2437 break;
2438 case 0x20: /* INVALID COMMAND OPCODE */
2439 case 0x24: /* INVALID FIELD IN CDB */
2440 switch (SCpnt->cmnd[0]) {
2441 case UNMAP:
2442 sd_disable_discard(sdkp);
2443 break;
2444 case WRITE_SAME_16:
2445 case WRITE_SAME:
2446 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2447 sd_disable_discard(sdkp);
2448 } else {
2449 sd_disable_write_same(sdkp);
2450 req->rq_flags |= RQF_QUIET;
2451 }
2452 break;
2453 }
2454 }
2455 break;
2456 default:
2457 break;
2458 }
2459
2460 out:
2461 if (sdkp->device->type == TYPE_ZBC)
2462 good_bytes = sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2463
2464 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2465 "sd_done: completed %d of %d bytes\n",
2466 good_bytes, scsi_bufflen(SCpnt)));
2467
2468 return good_bytes;
2469 }
2470
2471 /*
2472 * spinup disk - called only in sd_revalidate_disk()
2473 */
2474 static void
sd_spinup_disk(struct scsi_disk * sdkp)2475 sd_spinup_disk(struct scsi_disk *sdkp)
2476 {
2477 static const u8 cmd[10] = { TEST_UNIT_READY };
2478 unsigned long spintime_expire = 0;
2479 int the_result, spintime, sense_valid = 0;
2480 struct scsi_sense_hdr sshdr;
2481 struct scsi_failure failure_defs[] = {
2482 /* Do not retry Medium Not Present */
2483 {
2484 .sense = UNIT_ATTENTION,
2485 .asc = 0x3A,
2486 .ascq = SCMD_FAILURE_ASCQ_ANY,
2487 .result = SAM_STAT_CHECK_CONDITION,
2488 },
2489 {
2490 .sense = NOT_READY,
2491 .asc = 0x3A,
2492 .ascq = SCMD_FAILURE_ASCQ_ANY,
2493 .result = SAM_STAT_CHECK_CONDITION,
2494 },
2495 /* Retry when scsi_status_is_good would return false 3 times */
2496 {
2497 .result = SCMD_FAILURE_STAT_ANY,
2498 .allowed = 3,
2499 },
2500 {}
2501 };
2502 struct scsi_failures failures = {
2503 .failure_definitions = failure_defs,
2504 };
2505 const struct scsi_exec_args exec_args = {
2506 .sshdr = &sshdr,
2507 .failures = &failures,
2508 };
2509
2510 spintime = 0;
2511
2512 /* Spin up drives, as required. Only do this at boot time */
2513 /* Spinup needs to be done for module loads too. */
2514 do {
2515 bool media_was_present = sdkp->media_present;
2516
2517 scsi_failures_reset_retries(&failures);
2518
2519 the_result = scsi_execute_cmd(sdkp->device, cmd, REQ_OP_DRV_IN,
2520 NULL, 0, SD_TIMEOUT,
2521 sdkp->max_retries, &exec_args);
2522
2523
2524 if (the_result > 0) {
2525 /*
2526 * If the drive has indicated to us that it doesn't
2527 * have any media in it, don't bother with any more
2528 * polling.
2529 */
2530 if (media_not_present(sdkp, &sshdr)) {
2531 if (media_was_present)
2532 sd_printk(KERN_NOTICE, sdkp,
2533 "Media removed, stopped polling\n");
2534 return;
2535 }
2536 sense_valid = scsi_sense_valid(&sshdr);
2537 }
2538
2539 if (!scsi_status_is_check_condition(the_result)) {
2540 /* no sense, TUR either succeeded or failed
2541 * with a status error */
2542 if(!spintime && !scsi_status_is_good(the_result)) {
2543 sd_print_result(sdkp, "Test Unit Ready failed",
2544 the_result);
2545 }
2546 break;
2547 }
2548
2549 /*
2550 * The device does not want the automatic start to be issued.
2551 */
2552 if (sdkp->device->no_start_on_add)
2553 break;
2554
2555 if (sense_valid && sshdr.sense_key == NOT_READY) {
2556 if (sshdr.asc == 4 && sshdr.ascq == 3)
2557 break; /* manual intervention required */
2558 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2559 break; /* standby */
2560 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2561 break; /* unavailable */
2562 if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2563 break; /* sanitize in progress */
2564 if (sshdr.asc == 4 && sshdr.ascq == 0x24)
2565 break; /* depopulation in progress */
2566 if (sshdr.asc == 4 && sshdr.ascq == 0x25)
2567 break; /* depopulation restoration in progress */
2568 /*
2569 * Issue command to spin up drive when not ready
2570 */
2571 if (!spintime) {
2572 /* Return immediately and start spin cycle */
2573 const u8 start_cmd[10] = {
2574 [0] = START_STOP,
2575 [1] = 1,
2576 [4] = sdkp->device->start_stop_pwr_cond ?
2577 0x11 : 1,
2578 };
2579
2580 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2581 scsi_execute_cmd(sdkp->device, start_cmd,
2582 REQ_OP_DRV_IN, NULL, 0,
2583 SD_TIMEOUT, sdkp->max_retries,
2584 &exec_args);
2585 spintime_expire = jiffies + 100 * HZ;
2586 spintime = 1;
2587 }
2588 /* Wait 1 second for next try */
2589 msleep(1000);
2590 printk(KERN_CONT ".");
2591
2592 /*
2593 * Wait for USB flash devices with slow firmware.
2594 * Yes, this sense key/ASC combination shouldn't
2595 * occur here. It's characteristic of these devices.
2596 */
2597 } else if (sense_valid &&
2598 sshdr.sense_key == UNIT_ATTENTION &&
2599 sshdr.asc == 0x28) {
2600 if (!spintime) {
2601 spintime_expire = jiffies + 5 * HZ;
2602 spintime = 1;
2603 }
2604 /* Wait 1 second for next try */
2605 msleep(1000);
2606 } else {
2607 /* we don't understand the sense code, so it's
2608 * probably pointless to loop */
2609 if(!spintime) {
2610 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2611 sd_print_sense_hdr(sdkp, &sshdr);
2612 }
2613 break;
2614 }
2615
2616 } while (spintime && time_before_eq(jiffies, spintime_expire));
2617
2618 if (spintime) {
2619 if (scsi_status_is_good(the_result))
2620 printk(KERN_CONT "ready\n");
2621 else
2622 printk(KERN_CONT "not responding...\n");
2623 }
2624 }
2625
2626 /*
2627 * Determine whether disk supports Data Integrity Field.
2628 */
sd_read_protection_type(struct scsi_disk * sdkp,unsigned char * buffer)2629 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2630 {
2631 struct scsi_device *sdp = sdkp->device;
2632 u8 type;
2633
2634 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) {
2635 sdkp->protection_type = 0;
2636 return 0;
2637 }
2638
2639 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2640
2641 if (type > T10_PI_TYPE3_PROTECTION) {
2642 sd_printk(KERN_ERR, sdkp,
2643 "formatted with unsupported protection type %u. Disabling disk!\n",
2644 type);
2645 sdkp->protection_type = 0;
2646 return -ENODEV;
2647 }
2648
2649 sdkp->protection_type = type;
2650
2651 return 0;
2652 }
2653
sd_config_protection(struct scsi_disk * sdkp,struct queue_limits * lim)2654 static void sd_config_protection(struct scsi_disk *sdkp,
2655 struct queue_limits *lim)
2656 {
2657 struct scsi_device *sdp = sdkp->device;
2658
2659 if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY))
2660 sd_dif_config_host(sdkp, lim);
2661
2662 if (!sdkp->protection_type)
2663 return;
2664
2665 if (!scsi_host_dif_capable(sdp->host, sdkp->protection_type)) {
2666 sd_first_printk(KERN_NOTICE, sdkp,
2667 "Disabling DIF Type %u protection\n",
2668 sdkp->protection_type);
2669 sdkp->protection_type = 0;
2670 }
2671
2672 sd_first_printk(KERN_NOTICE, sdkp, "Enabling DIF Type %u protection\n",
2673 sdkp->protection_type);
2674 }
2675
read_capacity_error(struct scsi_disk * sdkp,struct scsi_device * sdp,struct scsi_sense_hdr * sshdr,int sense_valid,int the_result)2676 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2677 struct scsi_sense_hdr *sshdr, int sense_valid,
2678 int the_result)
2679 {
2680 if (sense_valid)
2681 sd_print_sense_hdr(sdkp, sshdr);
2682 else
2683 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2684
2685 /*
2686 * Set dirty bit for removable devices if not ready -
2687 * sometimes drives will not report this properly.
2688 */
2689 if (sdp->removable &&
2690 sense_valid && sshdr->sense_key == NOT_READY)
2691 set_media_not_present(sdkp);
2692
2693 /*
2694 * We used to set media_present to 0 here to indicate no media
2695 * in the drive, but some drives fail read capacity even with
2696 * media present, so we can't do that.
2697 */
2698 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2699 }
2700
2701 #define RC16_LEN 32
2702 #if RC16_LEN > SD_BUF_SIZE
2703 #error RC16_LEN must not be more than SD_BUF_SIZE
2704 #endif
2705
2706 #define READ_CAPACITY_RETRIES_ON_RESET 10
2707
read_capacity_16(struct scsi_disk * sdkp,struct scsi_device * sdp,struct queue_limits * lim,unsigned char * buffer)2708 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2709 struct queue_limits *lim, unsigned char *buffer)
2710 {
2711 unsigned char cmd[16];
2712 struct scsi_sense_hdr sshdr;
2713 const struct scsi_exec_args exec_args = {
2714 .sshdr = &sshdr,
2715 };
2716 int sense_valid = 0;
2717 int the_result;
2718 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2719 unsigned int alignment;
2720 unsigned long long lba;
2721 unsigned sector_size;
2722
2723 if (sdp->no_read_capacity_16)
2724 return -EINVAL;
2725
2726 do {
2727 memset(cmd, 0, 16);
2728 cmd[0] = SERVICE_ACTION_IN_16;
2729 cmd[1] = SAI_READ_CAPACITY_16;
2730 cmd[13] = RC16_LEN;
2731 memset(buffer, 0, RC16_LEN);
2732
2733 the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN,
2734 buffer, RC16_LEN, SD_TIMEOUT,
2735 sdkp->max_retries, &exec_args);
2736 if (the_result > 0) {
2737 if (media_not_present(sdkp, &sshdr))
2738 return -ENODEV;
2739
2740 sense_valid = scsi_sense_valid(&sshdr);
2741 if (sense_valid &&
2742 sshdr.sense_key == ILLEGAL_REQUEST &&
2743 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2744 sshdr.ascq == 0x00)
2745 /* Invalid Command Operation Code or
2746 * Invalid Field in CDB, just retry
2747 * silently with RC10 */
2748 return -EINVAL;
2749 if (sense_valid &&
2750 sshdr.sense_key == UNIT_ATTENTION &&
2751 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2752 /* Device reset might occur several times,
2753 * give it one more chance */
2754 if (--reset_retries > 0)
2755 continue;
2756 }
2757 retries--;
2758
2759 } while (the_result && retries);
2760
2761 if (the_result) {
2762 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2763 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2764 return -EINVAL;
2765 }
2766
2767 sector_size = get_unaligned_be32(&buffer[8]);
2768 lba = get_unaligned_be64(&buffer[0]);
2769
2770 if (sd_read_protection_type(sdkp, buffer) < 0) {
2771 sdkp->capacity = 0;
2772 return -ENODEV;
2773 }
2774
2775 /* Logical blocks per physical block exponent */
2776 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2777
2778 /* RC basis */
2779 sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2780
2781 /* Lowest aligned logical block */
2782 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2783 lim->alignment_offset = alignment;
2784 if (alignment && sdkp->first_scan)
2785 sd_printk(KERN_NOTICE, sdkp,
2786 "physical block alignment offset: %u\n", alignment);
2787
2788 if (buffer[14] & 0x80) { /* LBPME */
2789 sdkp->lbpme = 1;
2790
2791 if (buffer[14] & 0x40) /* LBPRZ */
2792 sdkp->lbprz = 1;
2793 }
2794
2795 sdkp->capacity = lba + 1;
2796 return sector_size;
2797 }
2798
read_capacity_10(struct scsi_disk * sdkp,struct scsi_device * sdp,unsigned char * buffer)2799 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2800 unsigned char *buffer)
2801 {
2802 static const u8 cmd[10] = { READ_CAPACITY };
2803 struct scsi_sense_hdr sshdr;
2804 struct scsi_failure failure_defs[] = {
2805 /* Do not retry Medium Not Present */
2806 {
2807 .sense = UNIT_ATTENTION,
2808 .asc = 0x3A,
2809 .result = SAM_STAT_CHECK_CONDITION,
2810 },
2811 {
2812 .sense = NOT_READY,
2813 .asc = 0x3A,
2814 .result = SAM_STAT_CHECK_CONDITION,
2815 },
2816 /* Device reset might occur several times so retry a lot */
2817 {
2818 .sense = UNIT_ATTENTION,
2819 .asc = 0x29,
2820 .allowed = READ_CAPACITY_RETRIES_ON_RESET,
2821 .result = SAM_STAT_CHECK_CONDITION,
2822 },
2823 /* Any other error not listed above retry 3 times */
2824 {
2825 .result = SCMD_FAILURE_RESULT_ANY,
2826 .allowed = 3,
2827 },
2828 {}
2829 };
2830 struct scsi_failures failures = {
2831 .failure_definitions = failure_defs,
2832 };
2833 const struct scsi_exec_args exec_args = {
2834 .sshdr = &sshdr,
2835 .failures = &failures,
2836 };
2837 int sense_valid = 0;
2838 int the_result;
2839 sector_t lba;
2840 unsigned sector_size;
2841
2842 memset(buffer, 0, 8);
2843
2844 the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, buffer,
2845 8, SD_TIMEOUT, sdkp->max_retries,
2846 &exec_args);
2847
2848 if (the_result > 0) {
2849 sense_valid = scsi_sense_valid(&sshdr);
2850
2851 if (media_not_present(sdkp, &sshdr))
2852 return -ENODEV;
2853 }
2854
2855 if (the_result) {
2856 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2857 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2858 return -EINVAL;
2859 }
2860
2861 sector_size = get_unaligned_be32(&buffer[4]);
2862 lba = get_unaligned_be32(&buffer[0]);
2863
2864 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2865 /* Some buggy (usb cardreader) devices return an lba of
2866 0xffffffff when the want to report a size of 0 (with
2867 which they really mean no media is present) */
2868 sdkp->capacity = 0;
2869 sdkp->physical_block_size = sector_size;
2870 return sector_size;
2871 }
2872
2873 sdkp->capacity = lba + 1;
2874 sdkp->physical_block_size = sector_size;
2875 return sector_size;
2876 }
2877
sd_try_rc16_first(struct scsi_device * sdp)2878 static int sd_try_rc16_first(struct scsi_device *sdp)
2879 {
2880 if (sdp->host->max_cmd_len < 16)
2881 return 0;
2882 if (sdp->try_rc_10_first)
2883 return 0;
2884 if (sdp->scsi_level > SCSI_SPC_2)
2885 return 1;
2886 if (scsi_device_protection(sdp))
2887 return 1;
2888 return 0;
2889 }
2890
2891 /*
2892 * read disk capacity
2893 */
2894 static void
sd_read_capacity(struct scsi_disk * sdkp,struct queue_limits * lim,unsigned char * buffer)2895 sd_read_capacity(struct scsi_disk *sdkp, struct queue_limits *lim,
2896 unsigned char *buffer)
2897 {
2898 int sector_size;
2899 struct scsi_device *sdp = sdkp->device;
2900
2901 if (sd_try_rc16_first(sdp)) {
2902 sector_size = read_capacity_16(sdkp, sdp, lim, buffer);
2903 if (sector_size == -EOVERFLOW)
2904 goto got_data;
2905 if (sector_size == -ENODEV)
2906 return;
2907 if (sector_size < 0)
2908 sector_size = read_capacity_10(sdkp, sdp, buffer);
2909 if (sector_size < 0)
2910 return;
2911 } else {
2912 sector_size = read_capacity_10(sdkp, sdp, buffer);
2913 if (sector_size == -EOVERFLOW)
2914 goto got_data;
2915 if (sector_size < 0)
2916 return;
2917 if ((sizeof(sdkp->capacity) > 4) &&
2918 (sdkp->capacity > 0xffffffffULL)) {
2919 int old_sector_size = sector_size;
2920 sd_printk(KERN_NOTICE, sdkp,
2921 "Very big device. Trying to use READ CAPACITY(16).\n");
2922 sector_size = read_capacity_16(sdkp, sdp, lim, buffer);
2923 if (sector_size < 0) {
2924 sd_printk(KERN_NOTICE, sdkp,
2925 "Using 0xffffffff as device size\n");
2926 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2927 sector_size = old_sector_size;
2928 goto got_data;
2929 }
2930 /* Remember that READ CAPACITY(16) succeeded */
2931 sdp->try_rc_10_first = 0;
2932 }
2933 }
2934
2935 /* Some devices are known to return the total number of blocks,
2936 * not the highest block number. Some devices have versions
2937 * which do this and others which do not. Some devices we might
2938 * suspect of doing this but we don't know for certain.
2939 *
2940 * If we know the reported capacity is wrong, decrement it. If
2941 * we can only guess, then assume the number of blocks is even
2942 * (usually true but not always) and err on the side of lowering
2943 * the capacity.
2944 */
2945 if (sdp->fix_capacity ||
2946 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2947 sd_printk(KERN_INFO, sdkp,
2948 "Adjusting the sector count from its reported value: %llu\n",
2949 (unsigned long long) sdkp->capacity);
2950 --sdkp->capacity;
2951 }
2952
2953 got_data:
2954 if (sector_size == 0) {
2955 sector_size = 512;
2956 sd_printk(KERN_NOTICE, sdkp,
2957 "Sector size 0 reported, assuming 512.\n");
2958 }
2959
2960 if (blk_validate_block_size(sector_size)) {
2961 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2962 sector_size);
2963 /*
2964 * The user might want to re-format the drive with
2965 * a supported sectorsize. Once this happens, it
2966 * would be relatively trivial to set the thing up.
2967 * For this reason, we leave the thing in the table.
2968 */
2969 sdkp->capacity = 0;
2970 /*
2971 * set a bogus sector size so the normal read/write
2972 * logic in the block layer will eventually refuse any
2973 * request on this device without tripping over power
2974 * of two sector size assumptions
2975 */
2976 sector_size = 512;
2977 }
2978 lim->logical_block_size = sector_size;
2979 lim->physical_block_size = sdkp->physical_block_size;
2980 sdkp->device->sector_size = sector_size;
2981
2982 if (sdkp->capacity > 0xffffffff)
2983 sdp->use_16_for_rw = 1;
2984
2985 }
2986
2987 /*
2988 * Print disk capacity
2989 */
2990 static void
sd_print_capacity(struct scsi_disk * sdkp,sector_t old_capacity)2991 sd_print_capacity(struct scsi_disk *sdkp,
2992 sector_t old_capacity)
2993 {
2994 int sector_size = sdkp->device->sector_size;
2995 char cap_str_2[10], cap_str_10[10];
2996
2997 if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2998 return;
2999
3000 string_get_size(sdkp->capacity, sector_size,
3001 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
3002 string_get_size(sdkp->capacity, sector_size,
3003 STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
3004
3005 sd_printk(KERN_NOTICE, sdkp,
3006 "%llu %d-byte logical blocks: (%s/%s)\n",
3007 (unsigned long long)sdkp->capacity,
3008 sector_size, cap_str_10, cap_str_2);
3009
3010 if (sdkp->physical_block_size != sector_size)
3011 sd_printk(KERN_NOTICE, sdkp,
3012 "%u-byte physical blocks\n",
3013 sdkp->physical_block_size);
3014 }
3015
3016 /* called with buffer of length 512 */
3017 static inline int
sd_do_mode_sense(struct scsi_disk * sdkp,int dbd,int modepage,unsigned char * buffer,int len,struct scsi_mode_data * data,struct scsi_sense_hdr * sshdr)3018 sd_do_mode_sense(struct scsi_disk *sdkp, int dbd, int modepage,
3019 unsigned char *buffer, int len, struct scsi_mode_data *data,
3020 struct scsi_sense_hdr *sshdr)
3021 {
3022 /*
3023 * If we must use MODE SENSE(10), make sure that the buffer length
3024 * is at least 8 bytes so that the mode sense header fits.
3025 */
3026 if (sdkp->device->use_10_for_ms && len < 8)
3027 len = 8;
3028
3029 return scsi_mode_sense(sdkp->device, dbd, modepage, 0, buffer, len,
3030 SD_TIMEOUT, sdkp->max_retries, data, sshdr);
3031 }
3032
3033 /*
3034 * read write protect setting, if possible - called only in sd_revalidate_disk()
3035 * called with buffer of length SD_BUF_SIZE
3036 */
3037 static void
sd_read_write_protect_flag(struct scsi_disk * sdkp,unsigned char * buffer)3038 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
3039 {
3040 int res;
3041 struct scsi_device *sdp = sdkp->device;
3042 struct scsi_mode_data data;
3043 int old_wp = sdkp->write_prot;
3044
3045 set_disk_ro(sdkp->disk, 0);
3046 if (sdp->skip_ms_page_3f) {
3047 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
3048 return;
3049 }
3050
3051 if (sdp->use_192_bytes_for_3f) {
3052 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 192, &data, NULL);
3053 } else {
3054 /*
3055 * First attempt: ask for all pages (0x3F), but only 4 bytes.
3056 * We have to start carefully: some devices hang if we ask
3057 * for more than is available.
3058 */
3059 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 4, &data, NULL);
3060
3061 /*
3062 * Second attempt: ask for page 0 When only page 0 is
3063 * implemented, a request for page 3F may return Sense Key
3064 * 5: Illegal Request, Sense Code 24: Invalid field in
3065 * CDB.
3066 */
3067 if (res < 0)
3068 res = sd_do_mode_sense(sdkp, 0, 0, buffer, 4, &data, NULL);
3069
3070 /*
3071 * Third attempt: ask 255 bytes, as we did earlier.
3072 */
3073 if (res < 0)
3074 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 255,
3075 &data, NULL);
3076 }
3077
3078 if (res < 0) {
3079 sd_first_printk(KERN_WARNING, sdkp,
3080 "Test WP failed, assume Write Enabled\n");
3081 } else {
3082 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
3083 set_disk_ro(sdkp->disk, sdkp->write_prot);
3084 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
3085 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
3086 sdkp->write_prot ? "on" : "off");
3087 sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
3088 }
3089 }
3090 }
3091
3092 /*
3093 * sd_read_cache_type - called only from sd_revalidate_disk()
3094 * called with buffer of length SD_BUF_SIZE
3095 */
3096 static void
sd_read_cache_type(struct scsi_disk * sdkp,unsigned char * buffer)3097 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
3098 {
3099 int len = 0, res;
3100 struct scsi_device *sdp = sdkp->device;
3101
3102 int dbd;
3103 int modepage;
3104 int first_len;
3105 struct scsi_mode_data data;
3106 struct scsi_sense_hdr sshdr;
3107 int old_wce = sdkp->WCE;
3108 int old_rcd = sdkp->RCD;
3109 int old_dpofua = sdkp->DPOFUA;
3110
3111
3112 if (sdkp->cache_override)
3113 return;
3114
3115 first_len = 4;
3116 if (sdp->skip_ms_page_8) {
3117 if (sdp->type == TYPE_RBC)
3118 goto defaults;
3119 else {
3120 if (sdp->skip_ms_page_3f)
3121 goto defaults;
3122 modepage = 0x3F;
3123 if (sdp->use_192_bytes_for_3f)
3124 first_len = 192;
3125 dbd = 0;
3126 }
3127 } else if (sdp->type == TYPE_RBC) {
3128 modepage = 6;
3129 dbd = 8;
3130 } else {
3131 modepage = 8;
3132 dbd = 0;
3133 }
3134
3135 /* cautiously ask */
3136 res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, first_len,
3137 &data, &sshdr);
3138
3139 if (res < 0)
3140 goto bad_sense;
3141
3142 if (!data.header_length) {
3143 modepage = 6;
3144 first_len = 0;
3145 sd_first_printk(KERN_ERR, sdkp,
3146 "Missing header in MODE_SENSE response\n");
3147 }
3148
3149 /* that went OK, now ask for the proper length */
3150 len = data.length;
3151
3152 /*
3153 * We're only interested in the first three bytes, actually.
3154 * But the data cache page is defined for the first 20.
3155 */
3156 if (len < 3)
3157 goto bad_sense;
3158 else if (len > SD_BUF_SIZE) {
3159 sd_first_printk(KERN_NOTICE, sdkp,
3160 "Truncating mode parameter data from %d to %d bytes\n",
3161 len, SD_BUF_SIZE);
3162 len = SD_BUF_SIZE;
3163 }
3164 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
3165 len = 192;
3166
3167 /* Get the data */
3168 if (len > first_len)
3169 res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, len,
3170 &data, &sshdr);
3171
3172 if (!res) {
3173 int offset = data.header_length + data.block_descriptor_length;
3174
3175 while (offset < len) {
3176 u8 page_code = buffer[offset] & 0x3F;
3177 u8 spf = buffer[offset] & 0x40;
3178
3179 if (page_code == 8 || page_code == 6) {
3180 /* We're interested only in the first 3 bytes.
3181 */
3182 if (len - offset <= 2) {
3183 sd_first_printk(KERN_ERR, sdkp,
3184 "Incomplete mode parameter data\n");
3185 goto defaults;
3186 } else {
3187 modepage = page_code;
3188 goto Page_found;
3189 }
3190 } else {
3191 /* Go to the next page */
3192 if (spf && len - offset > 3)
3193 offset += 4 + (buffer[offset+2] << 8) +
3194 buffer[offset+3];
3195 else if (!spf && len - offset > 1)
3196 offset += 2 + buffer[offset+1];
3197 else {
3198 sd_first_printk(KERN_ERR, sdkp,
3199 "Incomplete mode parameter data\n");
3200 goto defaults;
3201 }
3202 }
3203 }
3204
3205 sd_first_printk(KERN_WARNING, sdkp,
3206 "No Caching mode page found\n");
3207 goto defaults;
3208
3209 Page_found:
3210 if (modepage == 8) {
3211 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
3212 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
3213 } else {
3214 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
3215 sdkp->RCD = 0;
3216 }
3217
3218 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
3219 if (sdp->broken_fua) {
3220 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
3221 sdkp->DPOFUA = 0;
3222 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
3223 !sdkp->device->use_16_for_rw) {
3224 sd_first_printk(KERN_NOTICE, sdkp,
3225 "Uses READ/WRITE(6), disabling FUA\n");
3226 sdkp->DPOFUA = 0;
3227 }
3228
3229 /* No cache flush allowed for write protected devices */
3230 if (sdkp->WCE && sdkp->write_prot)
3231 sdkp->WCE = 0;
3232
3233 if (sdkp->first_scan || old_wce != sdkp->WCE ||
3234 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
3235 sd_printk(KERN_NOTICE, sdkp,
3236 "Write cache: %s, read cache: %s, %s\n",
3237 sdkp->WCE ? "enabled" : "disabled",
3238 sdkp->RCD ? "disabled" : "enabled",
3239 sdkp->DPOFUA ? "supports DPO and FUA"
3240 : "doesn't support DPO or FUA");
3241
3242 return;
3243 }
3244
3245 bad_sense:
3246 if (res == -EIO && scsi_sense_valid(&sshdr) &&
3247 sshdr.sense_key == ILLEGAL_REQUEST &&
3248 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
3249 /* Invalid field in CDB */
3250 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
3251 else
3252 sd_first_printk(KERN_ERR, sdkp,
3253 "Asking for cache data failed\n");
3254
3255 defaults:
3256 if (sdp->wce_default_on) {
3257 sd_first_printk(KERN_NOTICE, sdkp,
3258 "Assuming drive cache: write back\n");
3259 sdkp->WCE = 1;
3260 } else {
3261 sd_first_printk(KERN_WARNING, sdkp,
3262 "Assuming drive cache: write through\n");
3263 sdkp->WCE = 0;
3264 }
3265 sdkp->RCD = 0;
3266 sdkp->DPOFUA = 0;
3267 }
3268
sd_is_perm_stream(struct scsi_disk * sdkp,unsigned int stream_id)3269 static bool sd_is_perm_stream(struct scsi_disk *sdkp, unsigned int stream_id)
3270 {
3271 u8 cdb[16] = { SERVICE_ACTION_IN_16, SAI_GET_STREAM_STATUS };
3272 struct {
3273 struct scsi_stream_status_header h;
3274 struct scsi_stream_status s;
3275 } buf;
3276 struct scsi_device *sdev = sdkp->device;
3277 struct scsi_sense_hdr sshdr;
3278 const struct scsi_exec_args exec_args = {
3279 .sshdr = &sshdr,
3280 };
3281 int res;
3282
3283 put_unaligned_be16(stream_id, &cdb[4]);
3284 put_unaligned_be32(sizeof(buf), &cdb[10]);
3285
3286 res = scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, &buf, sizeof(buf),
3287 SD_TIMEOUT, sdkp->max_retries, &exec_args);
3288 if (res < 0)
3289 return false;
3290 if (scsi_status_is_check_condition(res) && scsi_sense_valid(&sshdr))
3291 sd_print_sense_hdr(sdkp, &sshdr);
3292 if (res)
3293 return false;
3294 if (get_unaligned_be32(&buf.h.len) < sizeof(struct scsi_stream_status))
3295 return false;
3296 return buf.s.perm;
3297 }
3298
sd_read_io_hints(struct scsi_disk * sdkp,unsigned char * buffer)3299 static void sd_read_io_hints(struct scsi_disk *sdkp, unsigned char *buffer)
3300 {
3301 struct scsi_device *sdp = sdkp->device;
3302 const struct scsi_io_group_descriptor *desc, *start, *end;
3303 u16 permanent_stream_count_old;
3304 struct scsi_sense_hdr sshdr;
3305 struct scsi_mode_data data;
3306 int res;
3307
3308 if (sdp->sdev_bflags & BLIST_SKIP_IO_HINTS)
3309 return;
3310
3311 res = scsi_mode_sense(sdp, /*dbd=*/0x8, /*modepage=*/0x0a,
3312 /*subpage=*/0x05, buffer, SD_BUF_SIZE, SD_TIMEOUT,
3313 sdkp->max_retries, &data, &sshdr);
3314 if (res < 0)
3315 return;
3316 start = (void *)buffer + data.header_length + 16;
3317 end = (void *)buffer + ALIGN_DOWN(data.header_length + data.length,
3318 sizeof(*end));
3319 /*
3320 * From "SBC-5 Constrained Streams with Data Lifetimes": Device severs
3321 * should assign the lowest numbered stream identifiers to permanent
3322 * streams.
3323 */
3324 for (desc = start; desc < end; desc++)
3325 if (!desc->st_enble || !sd_is_perm_stream(sdkp, desc - start))
3326 break;
3327 permanent_stream_count_old = sdkp->permanent_stream_count;
3328 sdkp->permanent_stream_count = desc - start;
3329 if (sdkp->rscs && sdkp->permanent_stream_count < 2)
3330 sd_printk(KERN_INFO, sdkp,
3331 "Unexpected: RSCS has been set and the permanent stream count is %u\n",
3332 sdkp->permanent_stream_count);
3333 else if (sdkp->permanent_stream_count != permanent_stream_count_old)
3334 sd_printk(KERN_INFO, sdkp, "permanent stream count = %d\n",
3335 sdkp->permanent_stream_count);
3336 }
3337
3338 /*
3339 * The ATO bit indicates whether the DIF application tag is available
3340 * for use by the operating system.
3341 */
sd_read_app_tag_own(struct scsi_disk * sdkp,unsigned char * buffer)3342 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
3343 {
3344 int res, offset;
3345 struct scsi_device *sdp = sdkp->device;
3346 struct scsi_mode_data data;
3347 struct scsi_sense_hdr sshdr;
3348
3349 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
3350 return;
3351
3352 if (sdkp->protection_type == 0)
3353 return;
3354
3355 res = scsi_mode_sense(sdp, 1, 0x0a, 0, buffer, 36, SD_TIMEOUT,
3356 sdkp->max_retries, &data, &sshdr);
3357
3358 if (res < 0 || !data.header_length ||
3359 data.length < 6) {
3360 sd_first_printk(KERN_WARNING, sdkp,
3361 "getting Control mode page failed, assume no ATO\n");
3362
3363 if (res == -EIO && scsi_sense_valid(&sshdr))
3364 sd_print_sense_hdr(sdkp, &sshdr);
3365
3366 return;
3367 }
3368
3369 offset = data.header_length + data.block_descriptor_length;
3370
3371 if ((buffer[offset] & 0x3f) != 0x0a) {
3372 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
3373 return;
3374 }
3375
3376 if ((buffer[offset + 5] & 0x80) == 0)
3377 return;
3378
3379 sdkp->ATO = 1;
3380
3381 return;
3382 }
3383
sd_discard_mode(struct scsi_disk * sdkp)3384 static unsigned int sd_discard_mode(struct scsi_disk *sdkp)
3385 {
3386 if (!sdkp->lbpme)
3387 return SD_LBP_FULL;
3388
3389 if (!sdkp->lbpvpd) {
3390 /* LBP VPD page not provided */
3391 if (sdkp->max_unmap_blocks)
3392 return SD_LBP_UNMAP;
3393 return SD_LBP_WS16;
3394 }
3395
3396 /* LBP VPD page tells us what to use */
3397 if (sdkp->lbpu && sdkp->max_unmap_blocks)
3398 return SD_LBP_UNMAP;
3399 if (sdkp->lbpws)
3400 return SD_LBP_WS16;
3401 if (sdkp->lbpws10)
3402 return SD_LBP_WS10;
3403 return SD_LBP_DISABLE;
3404 }
3405
3406 /*
3407 * Query disk device for preferred I/O sizes.
3408 */
sd_read_block_limits(struct scsi_disk * sdkp,struct queue_limits * lim)3409 static void sd_read_block_limits(struct scsi_disk *sdkp,
3410 struct queue_limits *lim)
3411 {
3412 struct scsi_vpd *vpd;
3413
3414 rcu_read_lock();
3415
3416 vpd = rcu_dereference(sdkp->device->vpd_pgb0);
3417 if (!vpd || vpd->len < 16)
3418 goto out;
3419
3420 sdkp->min_xfer_blocks = get_unaligned_be16(&vpd->data[6]);
3421 sdkp->max_xfer_blocks = get_unaligned_be32(&vpd->data[8]);
3422 sdkp->opt_xfer_blocks = get_unaligned_be32(&vpd->data[12]);
3423
3424 if (vpd->len >= 64) {
3425 unsigned int lba_count, desc_count;
3426
3427 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&vpd->data[36]);
3428
3429 if (!sdkp->lbpme)
3430 goto config_atomic;
3431
3432 lba_count = get_unaligned_be32(&vpd->data[20]);
3433 desc_count = get_unaligned_be32(&vpd->data[24]);
3434
3435 if (lba_count && desc_count)
3436 sdkp->max_unmap_blocks = lba_count;
3437
3438 sdkp->unmap_granularity = get_unaligned_be32(&vpd->data[28]);
3439
3440 if (vpd->data[32] & 0x80)
3441 sdkp->unmap_alignment =
3442 get_unaligned_be32(&vpd->data[32]) & ~(1 << 31);
3443
3444 config_atomic:
3445 sdkp->max_atomic = get_unaligned_be32(&vpd->data[44]);
3446 sdkp->atomic_alignment = get_unaligned_be32(&vpd->data[48]);
3447 sdkp->atomic_granularity = get_unaligned_be32(&vpd->data[52]);
3448 sdkp->max_atomic_with_boundary = get_unaligned_be32(&vpd->data[56]);
3449 sdkp->max_atomic_boundary = get_unaligned_be32(&vpd->data[60]);
3450
3451 sd_config_atomic(sdkp, lim);
3452 }
3453
3454 out:
3455 rcu_read_unlock();
3456 }
3457
3458 /* Parse the Block Limits Extension VPD page (0xb7) */
sd_read_block_limits_ext(struct scsi_disk * sdkp)3459 static void sd_read_block_limits_ext(struct scsi_disk *sdkp)
3460 {
3461 struct scsi_vpd *vpd;
3462
3463 rcu_read_lock();
3464 vpd = rcu_dereference(sdkp->device->vpd_pgb7);
3465 if (vpd && vpd->len >= 6)
3466 sdkp->rscs = vpd->data[5] & 1;
3467 rcu_read_unlock();
3468 }
3469
3470 /* Query block device characteristics */
sd_read_block_characteristics(struct scsi_disk * sdkp,struct queue_limits * lim)3471 static void sd_read_block_characteristics(struct scsi_disk *sdkp,
3472 struct queue_limits *lim)
3473 {
3474 struct scsi_vpd *vpd;
3475 u16 rot;
3476
3477 rcu_read_lock();
3478 vpd = rcu_dereference(sdkp->device->vpd_pgb1);
3479
3480 if (!vpd || vpd->len <= 8) {
3481 rcu_read_unlock();
3482 return;
3483 }
3484
3485 rot = get_unaligned_be16(&vpd->data[4]);
3486 sdkp->zoned = (vpd->data[8] >> 4) & 3;
3487 rcu_read_unlock();
3488
3489 if (rot == 1)
3490 lim->features &= ~(BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM);
3491
3492 if (!sdkp->first_scan)
3493 return;
3494
3495 if (sdkp->device->type == TYPE_ZBC)
3496 sd_printk(KERN_NOTICE, sdkp, "Host-managed zoned block device\n");
3497 else if (sdkp->zoned == 1)
3498 sd_printk(KERN_NOTICE, sdkp, "Host-aware SMR disk used as regular disk\n");
3499 else if (sdkp->zoned == 2)
3500 sd_printk(KERN_NOTICE, sdkp, "Drive-managed SMR disk\n");
3501 }
3502
3503 /**
3504 * sd_read_block_provisioning - Query provisioning VPD page
3505 * @sdkp: disk to query
3506 */
sd_read_block_provisioning(struct scsi_disk * sdkp)3507 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
3508 {
3509 struct scsi_vpd *vpd;
3510
3511 if (sdkp->lbpme == 0)
3512 return;
3513
3514 rcu_read_lock();
3515 vpd = rcu_dereference(sdkp->device->vpd_pgb2);
3516
3517 if (!vpd || vpd->len < 8) {
3518 rcu_read_unlock();
3519 return;
3520 }
3521
3522 sdkp->lbpvpd = 1;
3523 sdkp->lbpu = (vpd->data[5] >> 7) & 1; /* UNMAP */
3524 sdkp->lbpws = (vpd->data[5] >> 6) & 1; /* WRITE SAME(16) w/ UNMAP */
3525 sdkp->lbpws10 = (vpd->data[5] >> 5) & 1; /* WRITE SAME(10) w/ UNMAP */
3526 rcu_read_unlock();
3527 }
3528
sd_read_write_same(struct scsi_disk * sdkp,unsigned char * buffer)3529 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3530 {
3531 struct scsi_device *sdev = sdkp->device;
3532
3533 if (sdev->host->no_write_same) {
3534 sdev->no_write_same = 1;
3535
3536 return;
3537 }
3538
3539 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY, 0) < 0) {
3540 sdev->no_report_opcodes = 1;
3541
3542 /*
3543 * Disable WRITE SAME if REPORT SUPPORTED OPERATION CODES is
3544 * unsupported and this is an ATA device.
3545 */
3546 if (sdev->is_ata)
3547 sdev->no_write_same = 1;
3548 }
3549
3550 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16, 0) == 1)
3551 sdkp->ws16 = 1;
3552
3553 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME, 0) == 1)
3554 sdkp->ws10 = 1;
3555 }
3556
sd_read_security(struct scsi_disk * sdkp,unsigned char * buffer)3557 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3558 {
3559 struct scsi_device *sdev = sdkp->device;
3560
3561 if (!sdev->security_supported)
3562 return;
3563
3564 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3565 SECURITY_PROTOCOL_IN, 0) == 1 &&
3566 scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3567 SECURITY_PROTOCOL_OUT, 0) == 1)
3568 sdkp->security = 1;
3569 }
3570
sd64_to_sectors(struct scsi_disk * sdkp,u8 * buf)3571 static inline sector_t sd64_to_sectors(struct scsi_disk *sdkp, u8 *buf)
3572 {
3573 return logical_to_sectors(sdkp->device, get_unaligned_be64(buf));
3574 }
3575
3576 /**
3577 * sd_read_cpr - Query concurrent positioning ranges
3578 * @sdkp: disk to query
3579 */
sd_read_cpr(struct scsi_disk * sdkp)3580 static void sd_read_cpr(struct scsi_disk *sdkp)
3581 {
3582 struct blk_independent_access_ranges *iars = NULL;
3583 unsigned char *buffer = NULL;
3584 unsigned int nr_cpr = 0;
3585 int i, vpd_len, buf_len = SD_BUF_SIZE;
3586 u8 *desc;
3587
3588 /*
3589 * We need to have the capacity set first for the block layer to be
3590 * able to check the ranges.
3591 */
3592 if (sdkp->first_scan)
3593 return;
3594
3595 if (!sdkp->capacity)
3596 goto out;
3597
3598 /*
3599 * Concurrent Positioning Ranges VPD: there can be at most 256 ranges,
3600 * leading to a maximum page size of 64 + 256*32 bytes.
3601 */
3602 buf_len = 64 + 256*32;
3603 buffer = kmalloc(buf_len, GFP_KERNEL);
3604 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb9, buffer, buf_len))
3605 goto out;
3606
3607 /* We must have at least a 64B header and one 32B range descriptor */
3608 vpd_len = get_unaligned_be16(&buffer[2]) + 4;
3609 if (vpd_len > buf_len || vpd_len < 64 + 32 || (vpd_len & 31)) {
3610 sd_printk(KERN_ERR, sdkp,
3611 "Invalid Concurrent Positioning Ranges VPD page\n");
3612 goto out;
3613 }
3614
3615 nr_cpr = (vpd_len - 64) / 32;
3616 if (nr_cpr == 1) {
3617 nr_cpr = 0;
3618 goto out;
3619 }
3620
3621 iars = disk_alloc_independent_access_ranges(sdkp->disk, nr_cpr);
3622 if (!iars) {
3623 nr_cpr = 0;
3624 goto out;
3625 }
3626
3627 desc = &buffer[64];
3628 for (i = 0; i < nr_cpr; i++, desc += 32) {
3629 if (desc[0] != i) {
3630 sd_printk(KERN_ERR, sdkp,
3631 "Invalid Concurrent Positioning Range number\n");
3632 nr_cpr = 0;
3633 break;
3634 }
3635
3636 iars->ia_range[i].sector = sd64_to_sectors(sdkp, desc + 8);
3637 iars->ia_range[i].nr_sectors = sd64_to_sectors(sdkp, desc + 16);
3638 }
3639
3640 out:
3641 disk_set_independent_access_ranges(sdkp->disk, iars);
3642 if (nr_cpr && sdkp->nr_actuators != nr_cpr) {
3643 sd_printk(KERN_NOTICE, sdkp,
3644 "%u concurrent positioning ranges\n", nr_cpr);
3645 sdkp->nr_actuators = nr_cpr;
3646 }
3647
3648 kfree(buffer);
3649 }
3650
sd_validate_min_xfer_size(struct scsi_disk * sdkp)3651 static bool sd_validate_min_xfer_size(struct scsi_disk *sdkp)
3652 {
3653 struct scsi_device *sdp = sdkp->device;
3654 unsigned int min_xfer_bytes =
3655 logical_to_bytes(sdp, sdkp->min_xfer_blocks);
3656
3657 if (sdkp->min_xfer_blocks == 0)
3658 return false;
3659
3660 if (min_xfer_bytes & (sdkp->physical_block_size - 1)) {
3661 sd_first_printk(KERN_WARNING, sdkp,
3662 "Preferred minimum I/O size %u bytes not a multiple of physical block size (%u bytes)\n",
3663 min_xfer_bytes, sdkp->physical_block_size);
3664 sdkp->min_xfer_blocks = 0;
3665 return false;
3666 }
3667
3668 sd_first_printk(KERN_INFO, sdkp, "Preferred minimum I/O size %u bytes\n",
3669 min_xfer_bytes);
3670 return true;
3671 }
3672
3673 /*
3674 * Determine the device's preferred I/O size for reads and writes
3675 * unless the reported value is unreasonably small, large, not a
3676 * multiple of the physical block size, or simply garbage.
3677 */
sd_validate_opt_xfer_size(struct scsi_disk * sdkp,unsigned int dev_max)3678 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3679 unsigned int dev_max)
3680 {
3681 struct scsi_device *sdp = sdkp->device;
3682 unsigned int opt_xfer_bytes =
3683 logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3684 unsigned int min_xfer_bytes =
3685 logical_to_bytes(sdp, sdkp->min_xfer_blocks);
3686
3687 if (sdkp->opt_xfer_blocks == 0)
3688 return false;
3689
3690 if (sdkp->opt_xfer_blocks > dev_max) {
3691 sd_first_printk(KERN_WARNING, sdkp,
3692 "Optimal transfer size %u logical blocks > dev_max (%u logical blocks)\n",
3693 sdkp->opt_xfer_blocks, dev_max);
3694 return false;
3695 }
3696
3697 if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3698 sd_first_printk(KERN_WARNING, sdkp,
3699 "Optimal transfer size %u logical blocks > sd driver limit (%u logical blocks)\n",
3700 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3701 return false;
3702 }
3703
3704 if (opt_xfer_bytes < PAGE_SIZE) {
3705 sd_first_printk(KERN_WARNING, sdkp,
3706 "Optimal transfer size %u bytes < PAGE_SIZE (%u bytes)\n",
3707 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3708 return false;
3709 }
3710
3711 if (min_xfer_bytes && opt_xfer_bytes % min_xfer_bytes) {
3712 sd_first_printk(KERN_WARNING, sdkp,
3713 "Optimal transfer size %u bytes not a multiple of preferred minimum block size (%u bytes)\n",
3714 opt_xfer_bytes, min_xfer_bytes);
3715 return false;
3716 }
3717
3718 if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3719 sd_first_printk(KERN_WARNING, sdkp,
3720 "Optimal transfer size %u bytes not a multiple of physical block size (%u bytes)\n",
3721 opt_xfer_bytes, sdkp->physical_block_size);
3722 return false;
3723 }
3724
3725 sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3726 opt_xfer_bytes);
3727 return true;
3728 }
3729
sd_read_block_zero(struct scsi_disk * sdkp)3730 static void sd_read_block_zero(struct scsi_disk *sdkp)
3731 {
3732 struct scsi_device *sdev = sdkp->device;
3733 unsigned int buf_len = sdev->sector_size;
3734 u8 *buffer, cmd[16] = { };
3735
3736 buffer = kmalloc(buf_len, GFP_KERNEL);
3737 if (!buffer)
3738 return;
3739
3740 if (sdev->use_16_for_rw) {
3741 cmd[0] = READ_16;
3742 put_unaligned_be64(0, &cmd[2]); /* Logical block address 0 */
3743 put_unaligned_be32(1, &cmd[10]);/* Transfer 1 logical block */
3744 } else {
3745 cmd[0] = READ_10;
3746 put_unaligned_be32(0, &cmd[2]); /* Logical block address 0 */
3747 put_unaligned_be16(1, &cmd[7]); /* Transfer 1 logical block */
3748 }
3749
3750 scsi_execute_cmd(sdkp->device, cmd, REQ_OP_DRV_IN, buffer, buf_len,
3751 SD_TIMEOUT, sdkp->max_retries, NULL);
3752 kfree(buffer);
3753 }
3754
3755 /**
3756 * sd_revalidate_disk - called the first time a new disk is seen,
3757 * performs disk spin up, read_capacity, etc.
3758 * @disk: struct gendisk we care about
3759 **/
sd_revalidate_disk(struct gendisk * disk)3760 static void sd_revalidate_disk(struct gendisk *disk)
3761 {
3762 struct scsi_disk *sdkp = scsi_disk(disk);
3763 struct scsi_device *sdp = sdkp->device;
3764 sector_t old_capacity = sdkp->capacity;
3765 struct queue_limits *lim = NULL;
3766 unsigned char *buffer = NULL;
3767 unsigned int dev_max;
3768 int err;
3769
3770 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3771 "sd_revalidate_disk\n"));
3772
3773 /*
3774 * If the device is offline, don't try and read capacity or any
3775 * of the other niceties.
3776 */
3777 if (!scsi_device_online(sdp))
3778 return;
3779
3780 lim = kmalloc_obj(*lim);
3781 if (!lim)
3782 return;
3783
3784 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3785 if (!buffer)
3786 goto out;
3787
3788 sd_spinup_disk(sdkp);
3789
3790 *lim = queue_limits_start_update(sdkp->disk->queue);
3791
3792 /*
3793 * Without media there is no reason to ask; moreover, some devices
3794 * react badly if we do.
3795 */
3796 if (sdkp->media_present) {
3797 sd_read_capacity(sdkp, lim, buffer);
3798 /*
3799 * Some USB/UAS devices return generic values for mode pages
3800 * until the media has been accessed. Trigger a READ operation
3801 * to force the device to populate mode pages.
3802 */
3803 if (sdp->read_before_ms)
3804 sd_read_block_zero(sdkp);
3805 /*
3806 * set the default to rotational. All non-rotational devices
3807 * support the block characteristics VPD page, which will
3808 * cause this to be updated correctly and any device which
3809 * doesn't support it should be treated as rotational.
3810 */
3811 lim->features |= (BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM);
3812
3813 if (scsi_device_supports_vpd(sdp)) {
3814 sd_read_block_provisioning(sdkp);
3815 sd_read_block_limits(sdkp, lim);
3816 sd_read_block_limits_ext(sdkp);
3817 sd_read_block_characteristics(sdkp, lim);
3818 sd_zbc_read_zones(sdkp, lim, buffer);
3819 }
3820
3821 sd_config_discard(sdkp, lim, sd_discard_mode(sdkp));
3822
3823 sd_print_capacity(sdkp, old_capacity);
3824
3825 sd_read_write_protect_flag(sdkp, buffer);
3826 sd_read_cache_type(sdkp, buffer);
3827 sd_read_io_hints(sdkp, buffer);
3828 sd_read_app_tag_own(sdkp, buffer);
3829 sd_read_write_same(sdkp, buffer);
3830 sd_read_security(sdkp, buffer);
3831 sd_config_protection(sdkp, lim);
3832 }
3833
3834 /*
3835 * We now have all cache related info, determine how we deal
3836 * with flush requests.
3837 */
3838 sd_set_flush_flag(sdkp, lim);
3839
3840 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3841 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3842
3843 /* Some devices report a maximum block count for READ/WRITE requests. */
3844 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3845 lim->max_dev_sectors = logical_to_sectors(sdp, dev_max);
3846
3847 if (sd_validate_min_xfer_size(sdkp))
3848 lim->io_min = logical_to_bytes(sdp, sdkp->min_xfer_blocks);
3849 else
3850 lim->io_min = 0;
3851
3852 /*
3853 * Limit default to SCSI host optimal sector limit if set. There may be
3854 * an impact on performance for when the size of a request exceeds this
3855 * host limit.
3856 */
3857 lim->io_opt = sdp->host->opt_sectors << SECTOR_SHIFT;
3858 if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3859 lim->io_opt = min_not_zero(lim->io_opt,
3860 logical_to_bytes(sdp, sdkp->opt_xfer_blocks));
3861 }
3862
3863 sdkp->first_scan = 0;
3864
3865 set_capacity_and_notify(disk, logical_to_sectors(sdp, sdkp->capacity));
3866 sd_config_write_same(sdkp, lim);
3867
3868 err = queue_limits_commit_update_frozen(sdkp->disk->queue, lim);
3869 if (err)
3870 goto out;
3871
3872 /*
3873 * Query concurrent positioning ranges after
3874 * queue_limits_commit_update() unlocked q->limits_lock to avoid
3875 * deadlock with q->sysfs_dir_lock and q->sysfs_lock.
3876 */
3877 if (sdkp->media_present && scsi_device_supports_vpd(sdp))
3878 sd_read_cpr(sdkp);
3879
3880 /*
3881 * For a zoned drive, revalidating the zones can be done only once
3882 * the gendisk capacity is set. So if this fails, set back the gendisk
3883 * capacity to 0.
3884 */
3885 if (sd_zbc_revalidate_zones(sdkp))
3886 set_capacity_and_notify(disk, 0);
3887
3888 out:
3889 kfree(buffer);
3890 kfree(lim);
3891
3892 }
3893
3894 /**
3895 * sd_unlock_native_capacity - unlock native capacity
3896 * @disk: struct gendisk to set capacity for
3897 *
3898 * Block layer calls this function if it detects that partitions
3899 * on @disk reach beyond the end of the device. If the SCSI host
3900 * implements ->unlock_native_capacity() method, it's invoked to
3901 * give it a chance to adjust the device capacity.
3902 *
3903 * CONTEXT:
3904 * Defined by block layer. Might sleep.
3905 */
sd_unlock_native_capacity(struct gendisk * disk)3906 static void sd_unlock_native_capacity(struct gendisk *disk)
3907 {
3908 struct scsi_device *sdev = scsi_disk(disk)->device;
3909
3910 if (sdev->host->hostt->unlock_native_capacity)
3911 sdev->host->hostt->unlock_native_capacity(sdev);
3912 }
3913
3914 static const struct block_device_operations sd_fops = {
3915 .owner = THIS_MODULE,
3916 .open = sd_open,
3917 .release = sd_release,
3918 .ioctl = sd_ioctl,
3919 .getgeo = sd_getgeo,
3920 .compat_ioctl = blkdev_compat_ptr_ioctl,
3921 .check_events = sd_check_events,
3922 .unlock_native_capacity = sd_unlock_native_capacity,
3923 .report_zones = sd_zbc_report_zones,
3924 .get_unique_id = sd_get_unique_id,
3925 .free_disk = scsi_disk_free_disk,
3926 .pr_ops = &sd_pr_ops,
3927 };
3928
3929 /**
3930 * sd_format_disk_name - format disk name
3931 * @prefix: name prefix - ie. "sd" for SCSI disks
3932 * @index: index of the disk to format name for
3933 * @buf: output buffer
3934 * @buflen: length of the output buffer
3935 *
3936 * SCSI disk names starts at sda. The 26th device is sdz and the
3937 * 27th is sdaa. The last one for two lettered suffix is sdzz
3938 * which is followed by sdaaa.
3939 *
3940 * This is basically 26 base counting with one extra 'nil' entry
3941 * at the beginning from the second digit on and can be
3942 * determined using similar method as 26 base conversion with the
3943 * index shifted -1 after each digit is computed.
3944 *
3945 * CONTEXT:
3946 * Don't care.
3947 *
3948 * RETURNS:
3949 * 0 on success, -errno on failure.
3950 */
sd_format_disk_name(char * prefix,int index,char * buf,int buflen)3951 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3952 {
3953 const int base = 'z' - 'a' + 1;
3954 char *begin = buf + strlen(prefix);
3955 char *end = buf + buflen;
3956 char *p;
3957 int unit;
3958
3959 p = end - 1;
3960 *p = '\0';
3961 unit = base;
3962 do {
3963 if (p == begin)
3964 return -EINVAL;
3965 *--p = 'a' + (index % unit);
3966 index = (index / unit) - 1;
3967 } while (index >= 0);
3968
3969 memmove(begin, p, end - p);
3970 memcpy(buf, prefix, strlen(prefix));
3971
3972 return 0;
3973 }
3974
3975 /**
3976 * sd_probe - called during driver initialization and whenever a
3977 * new scsi device is attached to the system. It is called once
3978 * for each scsi device (not just disks) present.
3979 * @sdp: pointer to device object
3980 *
3981 * Returns 0 if successful (or not interested in this scsi device
3982 * (e.g. scanner)); 1 when there is an error.
3983 *
3984 * Note: this function is invoked from the scsi mid-level.
3985 * This function sets up the mapping between a given
3986 * <host,channel,id,lun> (found in sdp) and new device name
3987 * (e.g. /dev/sda). More precisely it is the block device major
3988 * and minor number that is chosen here.
3989 *
3990 * Assume sd_probe is not re-entrant (for time being)
3991 * Also think about sd_probe() and sd_remove() running coincidentally.
3992 **/
sd_probe(struct scsi_device * sdp)3993 static int sd_probe(struct scsi_device *sdp)
3994 {
3995 struct device *dev = &sdp->sdev_gendev;
3996 struct scsi_disk *sdkp;
3997 struct gendisk *gd;
3998 int index;
3999 int error;
4000
4001 scsi_autopm_get_device(sdp);
4002 error = -ENODEV;
4003 if (sdp->type != TYPE_DISK &&
4004 sdp->type != TYPE_ZBC &&
4005 sdp->type != TYPE_MOD &&
4006 sdp->type != TYPE_RBC)
4007 goto out;
4008
4009 if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) && sdp->type == TYPE_ZBC) {
4010 sdev_printk(KERN_WARNING, sdp,
4011 "Unsupported ZBC host-managed device.\n");
4012 goto out;
4013 }
4014
4015 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
4016 "sd_probe\n"));
4017
4018 error = -ENOMEM;
4019 sdkp = kzalloc_obj(*sdkp);
4020 if (!sdkp)
4021 goto out;
4022
4023 gd = blk_mq_alloc_disk_for_queue(sdp->request_queue,
4024 &sd_bio_compl_lkclass);
4025 if (!gd)
4026 goto out_free;
4027
4028 index = ida_alloc(&sd_index_ida, GFP_KERNEL);
4029 if (index < 0) {
4030 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
4031 goto out_put;
4032 }
4033
4034 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
4035 if (error) {
4036 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
4037 goto out_free_index;
4038 }
4039
4040 sdkp->device = sdp;
4041 sdkp->disk = gd;
4042 sdkp->index = index;
4043 sdkp->max_retries = SD_MAX_RETRIES;
4044 atomic_set(&sdkp->openers, 0);
4045 atomic_set(&sdkp->device->ioerr_cnt, 0);
4046
4047 if (!sdp->request_queue->rq_timeout) {
4048 if (sdp->type != TYPE_MOD)
4049 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
4050 else
4051 blk_queue_rq_timeout(sdp->request_queue,
4052 SD_MOD_TIMEOUT);
4053 }
4054
4055 device_initialize(&sdkp->disk_dev);
4056 sdkp->disk_dev.parent = get_device(dev);
4057 sdkp->disk_dev.class = &sd_disk_class;
4058 dev_set_name(&sdkp->disk_dev, "%s", dev_name(dev));
4059
4060 error = device_add(&sdkp->disk_dev);
4061 if (error) {
4062 put_device(&sdkp->disk_dev);
4063 put_disk(gd);
4064 goto out;
4065 }
4066
4067 dev_set_drvdata(dev, sdkp);
4068
4069 gd->major = sd_major((index & 0xf0) >> 4);
4070 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
4071 gd->minors = SD_MINORS;
4072
4073 gd->fops = &sd_fops;
4074 gd->private_data = sdkp;
4075
4076 /* defaults, until the device tells us otherwise */
4077 sdp->sector_size = 512;
4078 sdkp->capacity = 0;
4079 sdkp->media_present = 1;
4080 sdkp->write_prot = 0;
4081 sdkp->cache_override = 0;
4082 sdkp->WCE = 0;
4083 sdkp->RCD = 0;
4084 sdkp->ATO = 0;
4085 sdkp->first_scan = 1;
4086 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
4087
4088 sd_revalidate_disk(gd);
4089 if (sdp->sector_size > PAGE_SIZE) {
4090 if (sd_large_pool_create()) {
4091 error = -ENOMEM;
4092 goto out_free_index;
4093 }
4094 }
4095
4096 if (sdp->removable) {
4097 gd->flags |= GENHD_FL_REMOVABLE;
4098 gd->events |= DISK_EVENT_MEDIA_CHANGE;
4099 gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
4100 }
4101
4102 blk_pm_runtime_init(sdp->request_queue, dev);
4103 if (sdp->rpm_autosuspend) {
4104 pm_runtime_set_autosuspend_delay(dev,
4105 sdp->host->rpm_autosuspend_delay);
4106 }
4107
4108 error = device_add_disk(dev, gd, NULL);
4109 if (error) {
4110 device_unregister(&sdkp->disk_dev);
4111 put_disk(gd);
4112 if (sdp->sector_size > PAGE_SIZE)
4113 sd_large_pool_destroy();
4114 goto out;
4115 }
4116
4117 if (sdkp->security) {
4118 sdkp->opal_dev = init_opal_dev(sdkp, &sd_sec_submit);
4119 if (sdkp->opal_dev)
4120 sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
4121 }
4122
4123 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
4124 sdp->removable ? "removable " : "");
4125 scsi_autopm_put_device(sdp);
4126
4127 return 0;
4128
4129 out_free_index:
4130 ida_free(&sd_index_ida, index);
4131 out_put:
4132 put_disk(gd);
4133 out_free:
4134 kfree(sdkp);
4135 out:
4136 scsi_autopm_put_device(sdp);
4137 return error;
4138 }
4139
sd_start_stop_device(struct scsi_disk * sdkp,int start)4140 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
4141 {
4142 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
4143 struct scsi_sense_hdr sshdr;
4144 struct scsi_failure failure_defs[] = {
4145 {
4146 /* Power on, reset, or bus device reset occurred */
4147 .sense = UNIT_ATTENTION,
4148 .asc = 0x29,
4149 .ascq = 0,
4150 .result = SAM_STAT_CHECK_CONDITION,
4151 },
4152 {
4153 /* Power on occurred */
4154 .sense = UNIT_ATTENTION,
4155 .asc = 0x29,
4156 .ascq = 1,
4157 .result = SAM_STAT_CHECK_CONDITION,
4158 },
4159 {
4160 /* SCSI bus reset */
4161 .sense = UNIT_ATTENTION,
4162 .asc = 0x29,
4163 .ascq = 2,
4164 .result = SAM_STAT_CHECK_CONDITION,
4165 },
4166 {}
4167 };
4168 struct scsi_failures failures = {
4169 .total_allowed = 3,
4170 .failure_definitions = failure_defs,
4171 };
4172 const struct scsi_exec_args exec_args = {
4173 .sshdr = &sshdr,
4174 .req_flags = BLK_MQ_REQ_PM,
4175 .failures = &failures,
4176 };
4177 struct scsi_device *sdp = sdkp->device;
4178 int res;
4179
4180 if (start)
4181 cmd[4] |= 1; /* START */
4182
4183 if (sdp->start_stop_pwr_cond)
4184 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
4185
4186 if (!scsi_device_online(sdp))
4187 return -ENODEV;
4188
4189 res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, SD_TIMEOUT,
4190 sdkp->max_retries, &exec_args);
4191 if (res) {
4192 sd_print_result(sdkp, "Start/Stop Unit failed", res);
4193 if (res > 0 && scsi_sense_valid(&sshdr)) {
4194 sd_print_sense_hdr(sdkp, &sshdr);
4195 /* 0x3a is medium not present */
4196 if (sshdr.asc == 0x3a)
4197 res = 0;
4198 }
4199 }
4200
4201 /* SCSI error codes must not go to the generic layer */
4202 if (res)
4203 return -EIO;
4204
4205 return 0;
4206 }
4207
4208 /*
4209 * Send a SYNCHRONIZE CACHE instruction down to the device through
4210 * the normal SCSI command structure. Wait for the command to
4211 * complete.
4212 */
sd_shutdown(struct scsi_device * sdp)4213 static void sd_shutdown(struct scsi_device *sdp)
4214 {
4215 struct device *dev = &sdp->sdev_gendev;
4216 struct scsi_disk *sdkp = dev_get_drvdata(dev);
4217
4218 if (!sdkp)
4219 return; /* this can happen */
4220
4221 if (pm_runtime_suspended(dev))
4222 return;
4223
4224 if (sdkp->WCE && sdkp->media_present) {
4225 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
4226 sd_sync_cache(sdkp);
4227 }
4228
4229 if ((system_state != SYSTEM_RESTART &&
4230 sdkp->device->manage_system_start_stop) ||
4231 (system_state == SYSTEM_POWER_OFF &&
4232 sdkp->device->manage_shutdown) ||
4233 (system_state == SYSTEM_RUNNING &&
4234 sdkp->device->manage_runtime_start_stop) ||
4235 (system_state == SYSTEM_RESTART &&
4236 sdkp->device->manage_restart)) {
4237 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
4238 sd_start_stop_device(sdkp, 0);
4239 }
4240 }
4241
4242 /**
4243 * sd_remove - called whenever a scsi disk (previously recognized by
4244 * sd_probe) is detached from the system. It is called (potentially
4245 * multiple times) during sd module unload.
4246 * @sdp: pointer to device object
4247 *
4248 * Note: this function is invoked from the scsi mid-level.
4249 * This function potentially frees up a device name (e.g. /dev/sdc)
4250 * that could be re-used by a subsequent sd_probe().
4251 * This function is not called when the built-in sd driver is "exit-ed".
4252 **/
sd_remove(struct scsi_device * sdp)4253 static void sd_remove(struct scsi_device *sdp)
4254 {
4255 struct device *dev = &sdp->sdev_gendev;
4256 struct scsi_disk *sdkp = dev_get_drvdata(dev);
4257
4258 scsi_autopm_get_device(sdkp->device);
4259
4260 device_del(&sdkp->disk_dev);
4261 del_gendisk(sdkp->disk);
4262 if (!sdkp->suspended)
4263 sd_shutdown(sdp);
4264
4265 put_disk(sdkp->disk);
4266
4267 if (sdp->sector_size > PAGE_SIZE)
4268 sd_large_pool_destroy();
4269 }
4270
sd_do_start_stop(struct scsi_device * sdev,bool runtime)4271 static inline bool sd_do_start_stop(struct scsi_device *sdev, bool runtime)
4272 {
4273 return (sdev->manage_system_start_stop && !runtime) ||
4274 (sdev->manage_runtime_start_stop && runtime);
4275 }
4276
sd_suspend_common(struct device * dev,bool runtime)4277 static int sd_suspend_common(struct device *dev, bool runtime)
4278 {
4279 struct scsi_disk *sdkp = dev_get_drvdata(dev);
4280 int ret = 0;
4281
4282 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
4283 return 0;
4284
4285 if (sdkp->WCE && sdkp->media_present) {
4286 if (!sdkp->device->silence_suspend)
4287 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
4288 ret = sd_sync_cache(sdkp);
4289 /* ignore OFFLINE device */
4290 if (ret == -ENODEV)
4291 return 0;
4292
4293 if (ret)
4294 return ret;
4295 }
4296
4297 if (sd_do_start_stop(sdkp->device, runtime)) {
4298 if (!sdkp->device->silence_suspend)
4299 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
4300 /* an error is not worth aborting a system sleep */
4301 ret = sd_start_stop_device(sdkp, 0);
4302 if (!runtime)
4303 ret = 0;
4304 }
4305
4306 if (!ret)
4307 sdkp->suspended = true;
4308
4309 return ret;
4310 }
4311
sd_suspend_system(struct device * dev)4312 static int sd_suspend_system(struct device *dev)
4313 {
4314 if (pm_runtime_suspended(dev))
4315 return 0;
4316
4317 return sd_suspend_common(dev, false);
4318 }
4319
sd_suspend_runtime(struct device * dev)4320 static int sd_suspend_runtime(struct device *dev)
4321 {
4322 return sd_suspend_common(dev, true);
4323 }
4324
sd_resume(struct device * dev)4325 static int sd_resume(struct device *dev)
4326 {
4327 struct scsi_disk *sdkp = dev_get_drvdata(dev);
4328
4329 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
4330
4331 if (opal_unlock_from_suspend(sdkp->opal_dev)) {
4332 sd_printk(KERN_NOTICE, sdkp, "OPAL unlock failed\n");
4333 return -EIO;
4334 }
4335
4336 return 0;
4337 }
4338
sd_resume_common(struct device * dev,bool runtime)4339 static int sd_resume_common(struct device *dev, bool runtime)
4340 {
4341 struct scsi_disk *sdkp = dev_get_drvdata(dev);
4342 int ret;
4343
4344 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
4345 return 0;
4346
4347 if (!sd_do_start_stop(sdkp->device, runtime)) {
4348 sdkp->suspended = false;
4349 return 0;
4350 }
4351
4352 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
4353 ret = sd_start_stop_device(sdkp, 1);
4354 if (!ret) {
4355 sd_resume(dev);
4356 sdkp->suspended = false;
4357 }
4358
4359 return ret;
4360 }
4361
sd_resume_system(struct device * dev)4362 static int sd_resume_system(struct device *dev)
4363 {
4364 if (pm_runtime_suspended(dev)) {
4365 struct scsi_disk *sdkp = dev_get_drvdata(dev);
4366 struct scsi_device *sdp = sdkp ? sdkp->device : NULL;
4367
4368 if (sdp && sdp->force_runtime_start_on_system_start)
4369 pm_request_resume(dev);
4370
4371 return 0;
4372 }
4373
4374 return sd_resume_common(dev, false);
4375 }
4376
sd_resume_runtime(struct device * dev)4377 static int sd_resume_runtime(struct device *dev)
4378 {
4379 struct scsi_disk *sdkp = dev_get_drvdata(dev);
4380 struct scsi_device *sdp;
4381
4382 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
4383 return 0;
4384
4385 sdp = sdkp->device;
4386
4387 if (sdp->ignore_media_change) {
4388 /* clear the device's sense data */
4389 static const u8 cmd[10] = { REQUEST_SENSE };
4390 const struct scsi_exec_args exec_args = {
4391 .req_flags = BLK_MQ_REQ_PM,
4392 };
4393
4394 if (scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0,
4395 sdp->request_queue->rq_timeout, 1,
4396 &exec_args))
4397 sd_printk(KERN_NOTICE, sdkp,
4398 "Failed to clear sense data\n");
4399 }
4400
4401 return sd_resume_common(dev, true);
4402 }
4403
4404 static const struct dev_pm_ops sd_pm_ops = {
4405 .suspend = sd_suspend_system,
4406 .resume = sd_resume_system,
4407 .poweroff = sd_suspend_system,
4408 .restore = sd_resume_system,
4409 .runtime_suspend = sd_suspend_runtime,
4410 .runtime_resume = sd_resume_runtime,
4411 };
4412
4413 static struct scsi_driver sd_template = {
4414 .probe = sd_probe,
4415 .remove = sd_remove,
4416 .shutdown = sd_shutdown,
4417 .gendrv = {
4418 .name = "sd",
4419 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
4420 .pm = &sd_pm_ops,
4421 },
4422 .rescan = sd_rescan,
4423 .resume = sd_resume,
4424 .init_command = sd_init_command,
4425 .uninit_command = sd_uninit_command,
4426 .done = sd_done,
4427 .eh_action = sd_eh_action,
4428 .eh_reset = sd_eh_reset,
4429 };
4430
4431 /**
4432 * init_sd - entry point for this driver (both when built in or when
4433 * a module).
4434 *
4435 * Note: this function registers this driver with the scsi mid-level.
4436 **/
init_sd(void)4437 static int __init init_sd(void)
4438 {
4439 int majors = 0, i, err;
4440
4441 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
4442
4443 for (i = 0; i < SD_MAJORS; i++) {
4444 if (__register_blkdev(sd_major(i), "sd", sd_default_probe))
4445 continue;
4446 majors++;
4447 }
4448
4449 if (!majors)
4450 return -ENODEV;
4451
4452 err = class_register(&sd_disk_class);
4453 if (err)
4454 goto err_out;
4455
4456 sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
4457 if (!sd_page_pool) {
4458 printk(KERN_ERR "sd: can't init discard page pool\n");
4459 err = -ENOMEM;
4460 goto err_out_class;
4461 }
4462
4463 err = scsi_register_driver(&sd_template);
4464 if (err)
4465 goto err_out_driver;
4466
4467 return 0;
4468
4469 err_out_driver:
4470 mempool_destroy(sd_page_pool);
4471 err_out_class:
4472 class_unregister(&sd_disk_class);
4473 err_out:
4474 for (i = 0; i < SD_MAJORS; i++)
4475 unregister_blkdev(sd_major(i), "sd");
4476 return err;
4477 }
4478
4479 /**
4480 * exit_sd - exit point for this driver (when it is a module).
4481 *
4482 * Note: this function unregisters this driver from the scsi mid-level.
4483 **/
exit_sd(void)4484 static void __exit exit_sd(void)
4485 {
4486 int i;
4487
4488 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
4489
4490 scsi_unregister_driver(&sd_template);
4491 mempool_destroy(sd_page_pool);
4492 if (sd_large_page_pool)
4493 mempool_destroy(sd_large_page_pool);
4494
4495 class_unregister(&sd_disk_class);
4496
4497 for (i = 0; i < SD_MAJORS; i++)
4498 unregister_blkdev(sd_major(i), "sd");
4499 }
4500
4501 module_init(init_sd);
4502 module_exit(exit_sd);
4503
sd_print_sense_hdr(struct scsi_disk * sdkp,struct scsi_sense_hdr * sshdr)4504 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
4505 {
4506 scsi_print_sense_hdr(sdkp->device,
4507 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
4508 }
4509
sd_print_result(const struct scsi_disk * sdkp,const char * msg,int result)4510 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result)
4511 {
4512 const char *hb_string = scsi_hostbyte_string(result);
4513
4514 if (hb_string)
4515 sd_printk(KERN_INFO, sdkp,
4516 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
4517 hb_string ? hb_string : "invalid",
4518 "DRIVER_OK");
4519 else
4520 sd_printk(KERN_INFO, sdkp,
4521 "%s: Result: hostbyte=0x%02x driverbyte=%s\n",
4522 msg, host_byte(result), "DRIVER_OK");
4523 }
4524