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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 <[email protected]> original
11  *       - Eric Youngdale <[email protected]> add scatter-gather, multiple 
12  *         outstanding request, and other enhancements.
13  *         Support loadable low-level scsi drivers.
14  *       - Jirka Hanika <[email protected]> support more scsi disks using 
15  *         eight major numbers.
16  *       - Richard Gooch <[email protected]> support devfs.
17  *       - Torben Mathiasen <[email protected]> Resource allocation fixes in 
18  *         sd_init and cleanups.
19  *       - Alex Davis <[email protected]> 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 <[email protected]> cleanup for lk 2.5.x
23  *       - Badari Pulavarty <[email protected]>, Matthew Wilcox 
24  *         <[email protected]>, Kurt Garloff <[email protected]>: 
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/bio-integrity.h>
42 #include <linux/hdreg.h>
43 #include <linux/errno.h>
44 #include <linux/idr.h>
45 #include <linux/interrupt.h>
46 #include <linux/init.h>
47 #include <linux/blkdev.h>
48 #include <linux/blkpg.h>
49 #include <linux/blk-pm.h>
50 #include <linux/delay.h>
51 #include <linux/rw_hint.h>
52 #include <linux/major.h>
53 #include <linux/mutex.h>
54 #include <linux/string_helpers.h>
55 #include <linux/slab.h>
56 #include <linux/sed-opal.h>
57 #include <linux/pm_runtime.h>
58 #include <linux/pr.h>
59 #include <linux/t10-pi.h>
60 #include <linux/uaccess.h>
61 #include <asm/unaligned.h>
62
63 #include <scsi/scsi.h>
64 #include <scsi/scsi_cmnd.h>
65 #include <scsi/scsi_dbg.h>
66 #include <scsi/scsi_device.h>
67 #include <scsi/scsi_devinfo.h>
68 #include <scsi/scsi_driver.h>
69 #include <scsi/scsi_eh.h>
70 #include <scsi/scsi_host.h>
71 #include <scsi/scsi_ioctl.h>
72 #include <scsi/scsicam.h>
73 #include <scsi/scsi_common.h>
74
75 #include "sd.h"
76 #include "scsi_priv.h"
77 #include "scsi_logging.h"
78
79 MODULE_AUTHOR("Eric Youngdale");
80 MODULE_DESCRIPTION("SCSI disk (sd) driver");
81 MODULE_LICENSE("GPL");
82
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
95 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
96 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
97 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
98 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
99 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
100 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
101 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
102 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
103
104 #define SD_MINORS       16
105
106 static void sd_config_discard(struct scsi_disk *sdkp, struct queue_limits *lim,
107                 unsigned int mode);
108 static void sd_config_write_same(struct scsi_disk *sdkp,
109                 struct queue_limits *lim);
110 static int  sd_revalidate_disk(struct gendisk *);
111 static void sd_unlock_native_capacity(struct gendisk *disk);
112 static void sd_shutdown(struct device *);
113 static void scsi_disk_release(struct device *cdev);
114
115 static DEFINE_IDA(sd_index_ida);
116
117 static mempool_t *sd_page_pool;
118 static struct lock_class_key sd_bio_compl_lkclass;
119
120 static const char *sd_cache_types[] = {
121         "write through", "none", "write back",
122         "write back, no read (daft)"
123 };
124
125 static void sd_set_flush_flag(struct scsi_disk *sdkp,
126                 struct queue_limits *lim)
127 {
128         if (sdkp->WCE) {
129                 lim->features |= BLK_FEAT_WRITE_CACHE;
130                 if (sdkp->DPOFUA)
131                         lim->features |= BLK_FEAT_FUA;
132                 else
133                         lim->features &= ~BLK_FEAT_FUA;
134         } else {
135                 lim->features &= ~(BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA);
136         }
137 }
138
139 static ssize_t
140 cache_type_store(struct device *dev, struct device_attribute *attr,
141                  const char *buf, size_t count)
142 {
143         int ct, rcd, wce, sp;
144         struct scsi_disk *sdkp = to_scsi_disk(dev);
145         struct scsi_device *sdp = sdkp->device;
146         char buffer[64];
147         char *buffer_data;
148         struct scsi_mode_data data;
149         struct scsi_sense_hdr sshdr;
150         static const char temp[] = "temporary ";
151         int len, ret;
152
153         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
154                 /* no cache control on RBC devices; theoretically they
155                  * can do it, but there's probably so many exceptions
156                  * it's not worth the risk */
157                 return -EINVAL;
158
159         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
160                 buf += sizeof(temp) - 1;
161                 sdkp->cache_override = 1;
162         } else {
163                 sdkp->cache_override = 0;
164         }
165
166         ct = sysfs_match_string(sd_cache_types, buf);
167         if (ct < 0)
168                 return -EINVAL;
169
170         rcd = ct & 0x01 ? 1 : 0;
171         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
172
173         if (sdkp->cache_override) {
174                 struct queue_limits lim;
175
176                 sdkp->WCE = wce;
177                 sdkp->RCD = rcd;
178
179                 lim = queue_limits_start_update(sdkp->disk->queue);
180                 sd_set_flush_flag(sdkp, &lim);
181                 blk_mq_freeze_queue(sdkp->disk->queue);
182                 ret = queue_limits_commit_update(sdkp->disk->queue, &lim);
183                 blk_mq_unfreeze_queue(sdkp->disk->queue);
184                 if (ret)
185                         return ret;
186                 return count;
187         }
188
189         if (scsi_mode_sense(sdp, 0x08, 8, 0, buffer, sizeof(buffer), SD_TIMEOUT,
190                             sdkp->max_retries, &data, NULL))
191                 return -EINVAL;
192         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
193                   data.block_descriptor_length);
194         buffer_data = buffer + data.header_length +
195                 data.block_descriptor_length;
196         buffer_data[2] &= ~0x05;
197         buffer_data[2] |= wce << 2 | rcd;
198         sp = buffer_data[0] & 0x80 ? 1 : 0;
199         buffer_data[0] &= ~0x80;
200
201         /*
202          * Ensure WP, DPOFUA, and RESERVED fields are cleared in
203          * received mode parameter buffer before doing MODE SELECT.
204          */
205         data.device_specific = 0;
206
207         ret = scsi_mode_select(sdp, 1, sp, buffer_data, len, SD_TIMEOUT,
208                                sdkp->max_retries, &data, &sshdr);
209         if (ret) {
210                 if (ret > 0 && scsi_sense_valid(&sshdr))
211                         sd_print_sense_hdr(sdkp, &sshdr);
212                 return -EINVAL;
213         }
214         sd_revalidate_disk(sdkp->disk);
215         return count;
216 }
217
218 static ssize_t
219 manage_start_stop_show(struct device *dev,
220                        struct device_attribute *attr, char *buf)
221 {
222         struct scsi_disk *sdkp = to_scsi_disk(dev);
223         struct scsi_device *sdp = sdkp->device;
224
225         return sysfs_emit(buf, "%u\n",
226                           sdp->manage_system_start_stop &&
227                           sdp->manage_runtime_start_stop &&
228                           sdp->manage_shutdown);
229 }
230 static DEVICE_ATTR_RO(manage_start_stop);
231
232 static ssize_t
233 manage_system_start_stop_show(struct device *dev,
234                               struct device_attribute *attr, char *buf)
235 {
236         struct scsi_disk *sdkp = to_scsi_disk(dev);
237         struct scsi_device *sdp = sdkp->device;
238
239         return sysfs_emit(buf, "%u\n", sdp->manage_system_start_stop);
240 }
241
242 static ssize_t
243 manage_system_start_stop_store(struct device *dev,
244                                struct device_attribute *attr,
245                                const char *buf, size_t count)
246 {
247         struct scsi_disk *sdkp = to_scsi_disk(dev);
248         struct scsi_device *sdp = sdkp->device;
249         bool v;
250
251         if (!capable(CAP_SYS_ADMIN))
252                 return -EACCES;
253
254         if (kstrtobool(buf, &v))
255                 return -EINVAL;
256
257         sdp->manage_system_start_stop = v;
258
259         return count;
260 }
261 static DEVICE_ATTR_RW(manage_system_start_stop);
262
263 static ssize_t
264 manage_runtime_start_stop_show(struct device *dev,
265                                struct device_attribute *attr, char *buf)
266 {
267         struct scsi_disk *sdkp = to_scsi_disk(dev);
268         struct scsi_device *sdp = sdkp->device;
269
270         return sysfs_emit(buf, "%u\n", sdp->manage_runtime_start_stop);
271 }
272
273 static ssize_t
274 manage_runtime_start_stop_store(struct device *dev,
275                                 struct device_attribute *attr,
276                                 const char *buf, size_t count)
277 {
278         struct scsi_disk *sdkp = to_scsi_disk(dev);
279         struct scsi_device *sdp = sdkp->device;
280         bool v;
281
282         if (!capable(CAP_SYS_ADMIN))
283                 return -EACCES;
284
285         if (kstrtobool(buf, &v))
286                 return -EINVAL;
287
288         sdp->manage_runtime_start_stop = v;
289
290         return count;
291 }
292 static DEVICE_ATTR_RW(manage_runtime_start_stop);
293
294 static ssize_t manage_shutdown_show(struct device *dev,
295                                     struct device_attribute *attr, char *buf)
296 {
297         struct scsi_disk *sdkp = to_scsi_disk(dev);
298         struct scsi_device *sdp = sdkp->device;
299
300         return sysfs_emit(buf, "%u\n", sdp->manage_shutdown);
301 }
302
303 static ssize_t manage_shutdown_store(struct device *dev,
304                                      struct device_attribute *attr,
305                                      const char *buf, size_t count)
306 {
307         struct scsi_disk *sdkp = to_scsi_disk(dev);
308         struct scsi_device *sdp = sdkp->device;
309         bool v;
310
311         if (!capable(CAP_SYS_ADMIN))
312                 return -EACCES;
313
314         if (kstrtobool(buf, &v))
315                 return -EINVAL;
316
317         sdp->manage_shutdown = v;
318
319         return count;
320 }
321 static DEVICE_ATTR_RW(manage_shutdown);
322
323 static ssize_t
324 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
325 {
326         struct scsi_disk *sdkp = to_scsi_disk(dev);
327
328         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
329 }
330
331 static ssize_t
332 allow_restart_store(struct device *dev, struct device_attribute *attr,
333                     const char *buf, size_t count)
334 {
335         bool v;
336         struct scsi_disk *sdkp = to_scsi_disk(dev);
337         struct scsi_device *sdp = sdkp->device;
338
339         if (!capable(CAP_SYS_ADMIN))
340                 return -EACCES;
341
342         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
343                 return -EINVAL;
344
345         if (kstrtobool(buf, &v))
346                 return -EINVAL;
347
348         sdp->allow_restart = v;
349
350         return count;
351 }
352 static DEVICE_ATTR_RW(allow_restart);
353
354 static ssize_t
355 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
356 {
357         struct scsi_disk *sdkp = to_scsi_disk(dev);
358         int ct = sdkp->RCD + 2*sdkp->WCE;
359
360         return sprintf(buf, "%s\n", sd_cache_types[ct]);
361 }
362 static DEVICE_ATTR_RW(cache_type);
363
364 static ssize_t
365 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
366 {
367         struct scsi_disk *sdkp = to_scsi_disk(dev);
368
369         return sprintf(buf, "%u\n", sdkp->DPOFUA);
370 }
371 static DEVICE_ATTR_RO(FUA);
372
373 static ssize_t
374 protection_type_show(struct device *dev, struct device_attribute *attr,
375                      char *buf)
376 {
377         struct scsi_disk *sdkp = to_scsi_disk(dev);
378
379         return sprintf(buf, "%u\n", sdkp->protection_type);
380 }
381
382 static ssize_t
383 protection_type_store(struct device *dev, struct device_attribute *attr,
384                       const char *buf, size_t count)
385 {
386         struct scsi_disk *sdkp = to_scsi_disk(dev);
387         unsigned int val;
388         int err;
389
390         if (!capable(CAP_SYS_ADMIN))
391                 return -EACCES;
392
393         err = kstrtouint(buf, 10, &val);
394
395         if (err)
396                 return err;
397
398         if (val <= T10_PI_TYPE3_PROTECTION)
399                 sdkp->protection_type = val;
400
401         return count;
402 }
403 static DEVICE_ATTR_RW(protection_type);
404
405 static ssize_t
406 protection_mode_show(struct device *dev, struct device_attribute *attr,
407                      char *buf)
408 {
409         struct scsi_disk *sdkp = to_scsi_disk(dev);
410         struct scsi_device *sdp = sdkp->device;
411         unsigned int dif, dix;
412
413         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
414         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
415
416         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
417                 dif = 0;
418                 dix = 1;
419         }
420
421         if (!dif && !dix)
422                 return sprintf(buf, "none\n");
423
424         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
425 }
426 static DEVICE_ATTR_RO(protection_mode);
427
428 static ssize_t
429 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
430 {
431         struct scsi_disk *sdkp = to_scsi_disk(dev);
432
433         return sprintf(buf, "%u\n", sdkp->ATO);
434 }
435 static DEVICE_ATTR_RO(app_tag_own);
436
437 static ssize_t
438 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
439                        char *buf)
440 {
441         struct scsi_disk *sdkp = to_scsi_disk(dev);
442
443         return sprintf(buf, "%u\n", sdkp->lbpme);
444 }
445 static DEVICE_ATTR_RO(thin_provisioning);
446
447 /* sysfs_match_string() requires dense arrays */
448 static const char *lbp_mode[] = {
449         [SD_LBP_FULL]           = "full",
450         [SD_LBP_UNMAP]          = "unmap",
451         [SD_LBP_WS16]           = "writesame_16",
452         [SD_LBP_WS10]           = "writesame_10",
453         [SD_LBP_ZERO]           = "writesame_zero",
454         [SD_LBP_DISABLE]        = "disabled",
455 };
456
457 static ssize_t
458 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
459                        char *buf)
460 {
461         struct scsi_disk *sdkp = to_scsi_disk(dev);
462
463         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
464 }
465
466 static ssize_t
467 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
468                         const char *buf, size_t count)
469 {
470         struct scsi_disk *sdkp = to_scsi_disk(dev);
471         struct scsi_device *sdp = sdkp->device;
472         struct queue_limits lim;
473         int mode, err;
474
475         if (!capable(CAP_SYS_ADMIN))
476                 return -EACCES;
477
478         if (sdp->type != TYPE_DISK)
479                 return -EINVAL;
480
481         mode = sysfs_match_string(lbp_mode, buf);
482         if (mode < 0)
483                 return -EINVAL;
484
485         lim = queue_limits_start_update(sdkp->disk->queue);
486         sd_config_discard(sdkp, &lim, mode);
487         blk_mq_freeze_queue(sdkp->disk->queue);
488         err = queue_limits_commit_update(sdkp->disk->queue, &lim);
489         blk_mq_unfreeze_queue(sdkp->disk->queue);
490         if (err)
491                 return err;
492         return count;
493 }
494 static DEVICE_ATTR_RW(provisioning_mode);
495
496 /* sysfs_match_string() requires dense arrays */
497 static const char *zeroing_mode[] = {
498         [SD_ZERO_WRITE]         = "write",
499         [SD_ZERO_WS]            = "writesame",
500         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
501         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
502 };
503
504 static ssize_t
505 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
506                   char *buf)
507 {
508         struct scsi_disk *sdkp = to_scsi_disk(dev);
509
510         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
511 }
512
513 static ssize_t
514 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
515                    const char *buf, size_t count)
516 {
517         struct scsi_disk *sdkp = to_scsi_disk(dev);
518         int mode;
519
520         if (!capable(CAP_SYS_ADMIN))
521                 return -EACCES;
522
523         mode = sysfs_match_string(zeroing_mode, buf);
524         if (mode < 0)
525                 return -EINVAL;
526
527         sdkp->zeroing_mode = mode;
528
529         return count;
530 }
531 static DEVICE_ATTR_RW(zeroing_mode);
532
533 static ssize_t
534 max_medium_access_timeouts_show(struct device *dev,
535                                 struct device_attribute *attr, char *buf)
536 {
537         struct scsi_disk *sdkp = to_scsi_disk(dev);
538
539         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
540 }
541
542 static ssize_t
543 max_medium_access_timeouts_store(struct device *dev,
544                                  struct device_attribute *attr, const char *buf,
545                                  size_t count)
546 {
547         struct scsi_disk *sdkp = to_scsi_disk(dev);
548         int err;
549
550         if (!capable(CAP_SYS_ADMIN))
551                 return -EACCES;
552
553         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
554
555         return err ? err : count;
556 }
557 static DEVICE_ATTR_RW(max_medium_access_timeouts);
558
559 static ssize_t
560 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
561                            char *buf)
562 {
563         struct scsi_disk *sdkp = to_scsi_disk(dev);
564
565         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
566 }
567
568 static ssize_t
569 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
570                             const char *buf, size_t count)
571 {
572         struct scsi_disk *sdkp = to_scsi_disk(dev);
573         struct scsi_device *sdp = sdkp->device;
574         struct queue_limits lim;
575         unsigned long max;
576         int err;
577
578         if (!capable(CAP_SYS_ADMIN))
579                 return -EACCES;
580
581         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
582                 return -EINVAL;
583
584         err = kstrtoul(buf, 10, &max);
585
586         if (err)
587                 return err;
588
589         if (max == 0)
590                 sdp->no_write_same = 1;
591         else if (max <= SD_MAX_WS16_BLOCKS) {
592                 sdp->no_write_same = 0;
593                 sdkp->max_ws_blocks = max;
594         }
595
596         lim = queue_limits_start_update(sdkp->disk->queue);
597         sd_config_write_same(sdkp, &lim);
598         blk_mq_freeze_queue(sdkp->disk->queue);
599         err = queue_limits_commit_update(sdkp->disk->queue, &lim);
600         blk_mq_unfreeze_queue(sdkp->disk->queue);
601         if (err)
602                 return err;
603         return count;
604 }
605 static DEVICE_ATTR_RW(max_write_same_blocks);
606
607 static ssize_t
608 zoned_cap_show(struct device *dev, struct device_attribute *attr, char *buf)
609 {
610         struct scsi_disk *sdkp = to_scsi_disk(dev);
611
612         if (sdkp->device->type == TYPE_ZBC)
613                 return sprintf(buf, "host-managed\n");
614         if (sdkp->zoned == 1)
615                 return sprintf(buf, "host-aware\n");
616         if (sdkp->zoned == 2)
617                 return sprintf(buf, "drive-managed\n");
618         return sprintf(buf, "none\n");
619 }
620 static DEVICE_ATTR_RO(zoned_cap);
621
622 static ssize_t
623 max_retries_store(struct device *dev, struct device_attribute *attr,
624                   const char *buf, size_t count)
625 {
626         struct scsi_disk *sdkp = to_scsi_disk(dev);
627         struct scsi_device *sdev = sdkp->device;
628         int retries, err;
629
630         err = kstrtoint(buf, 10, &retries);
631         if (err)
632                 return err;
633
634         if (retries == SCSI_CMD_RETRIES_NO_LIMIT || retries <= SD_MAX_RETRIES) {
635                 sdkp->max_retries = retries;
636                 return count;
637         }
638
639         sdev_printk(KERN_ERR, sdev, "max_retries must be between -1 and %d\n",
640                     SD_MAX_RETRIES);
641         return -EINVAL;
642 }
643
644 static ssize_t
645 max_retries_show(struct device *dev, struct device_attribute *attr,
646                  char *buf)
647 {
648         struct scsi_disk *sdkp = to_scsi_disk(dev);
649
650         return sprintf(buf, "%d\n", sdkp->max_retries);
651 }
652
653 static DEVICE_ATTR_RW(max_retries);
654
655 static struct attribute *sd_disk_attrs[] = {
656         &dev_attr_cache_type.attr,
657         &dev_attr_FUA.attr,
658         &dev_attr_allow_restart.attr,
659         &dev_attr_manage_start_stop.attr,
660         &dev_attr_manage_system_start_stop.attr,
661         &dev_attr_manage_runtime_start_stop.attr,
662         &dev_attr_manage_shutdown.attr,
663         &dev_attr_protection_type.attr,
664         &dev_attr_protection_mode.attr,
665         &dev_attr_app_tag_own.attr,
666         &dev_attr_thin_provisioning.attr,
667         &dev_attr_provisioning_mode.attr,
668         &dev_attr_zeroing_mode.attr,
669         &dev_attr_max_write_same_blocks.attr,
670         &dev_attr_max_medium_access_timeouts.attr,
671         &dev_attr_zoned_cap.attr,
672         &dev_attr_max_retries.attr,
673         NULL,
674 };
675 ATTRIBUTE_GROUPS(sd_disk);
676
677 static struct class sd_disk_class = {
678         .name           = "scsi_disk",
679         .dev_release    = scsi_disk_release,
680         .dev_groups     = sd_disk_groups,
681 };
682
683 /*
684  * Don't request a new module, as that could deadlock in multipath
685  * environment.
686  */
687 static void sd_default_probe(dev_t devt)
688 {
689 }
690
691 /*
692  * Device no to disk mapping:
693  * 
694  *       major         disc2     disc  p1
695  *   |............|.............|....|....| <- dev_t
696  *    31        20 19          8 7  4 3  0
697  * 
698  * Inside a major, we have 16k disks, however mapped non-
699  * contiguously. The first 16 disks are for major0, the next
700  * ones with major1, ... Disk 256 is for major0 again, disk 272 
701  * for major1, ... 
702  * As we stay compatible with our numbering scheme, we can reuse 
703  * the well-know SCSI majors 8, 65--71, 136--143.
704  */
705 static int sd_major(int major_idx)
706 {
707         switch (major_idx) {
708         case 0:
709                 return SCSI_DISK0_MAJOR;
710         case 1 ... 7:
711                 return SCSI_DISK1_MAJOR + major_idx - 1;
712         case 8 ... 15:
713                 return SCSI_DISK8_MAJOR + major_idx - 8;
714         default:
715                 BUG();
716                 return 0;       /* shut up gcc */
717         }
718 }
719
720 #ifdef CONFIG_BLK_SED_OPAL
721 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
722                 size_t len, bool send)
723 {
724         struct scsi_disk *sdkp = data;
725         struct scsi_device *sdev = sdkp->device;
726         u8 cdb[12] = { 0, };
727         const struct scsi_exec_args exec_args = {
728                 .req_flags = BLK_MQ_REQ_PM,
729         };
730         int ret;
731
732         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
733         cdb[1] = secp;
734         put_unaligned_be16(spsp, &cdb[2]);
735         put_unaligned_be32(len, &cdb[6]);
736
737         ret = scsi_execute_cmd(sdev, cdb, send ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
738                                buffer, len, SD_TIMEOUT, sdkp->max_retries,
739                                &exec_args);
740         return ret <= 0 ? ret : -EIO;
741 }
742 #endif /* CONFIG_BLK_SED_OPAL */
743
744 /*
745  * Look up the DIX operation based on whether the command is read or
746  * write and whether dix and dif are enabled.
747  */
748 static unsigned int sd_prot_op(bool write, bool dix, bool dif)
749 {
750         /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
751         static const unsigned int ops[] = {     /* wrt dix dif */
752                 SCSI_PROT_NORMAL,               /*  0   0   0  */
753                 SCSI_PROT_READ_STRIP,           /*  0   0   1  */
754                 SCSI_PROT_READ_INSERT,          /*  0   1   0  */
755                 SCSI_PROT_READ_PASS,            /*  0   1   1  */
756                 SCSI_PROT_NORMAL,               /*  1   0   0  */
757                 SCSI_PROT_WRITE_INSERT,         /*  1   0   1  */
758                 SCSI_PROT_WRITE_STRIP,          /*  1   1   0  */
759                 SCSI_PROT_WRITE_PASS,           /*  1   1   1  */
760         };
761
762         return ops[write << 2 | dix << 1 | dif];
763 }
764
765 /*
766  * Returns a mask of the protection flags that are valid for a given DIX
767  * operation.
768  */
769 static unsigned int sd_prot_flag_mask(unsigned int prot_op)
770 {
771         static const unsigned int flag_mask[] = {
772                 [SCSI_PROT_NORMAL]              = 0,
773
774                 [SCSI_PROT_READ_STRIP]          = SCSI_PROT_TRANSFER_PI |
775                                                   SCSI_PROT_GUARD_CHECK |
776                                                   SCSI_PROT_REF_CHECK |
777                                                   SCSI_PROT_REF_INCREMENT,
778
779                 [SCSI_PROT_READ_INSERT]         = SCSI_PROT_REF_INCREMENT |
780                                                   SCSI_PROT_IP_CHECKSUM,
781
782                 [SCSI_PROT_READ_PASS]           = SCSI_PROT_TRANSFER_PI |
783                                                   SCSI_PROT_GUARD_CHECK |
784                                                   SCSI_PROT_REF_CHECK |
785                                                   SCSI_PROT_REF_INCREMENT |
786                                                   SCSI_PROT_IP_CHECKSUM,
787
788                 [SCSI_PROT_WRITE_INSERT]        = SCSI_PROT_TRANSFER_PI |
789                                                   SCSI_PROT_REF_INCREMENT,
790
791                 [SCSI_PROT_WRITE_STRIP]         = SCSI_PROT_GUARD_CHECK |
792                                                   SCSI_PROT_REF_CHECK |
793                                                   SCSI_PROT_REF_INCREMENT |
794                                                   SCSI_PROT_IP_CHECKSUM,
795
796                 [SCSI_PROT_WRITE_PASS]          = SCSI_PROT_TRANSFER_PI |
797                                                   SCSI_PROT_GUARD_CHECK |
798                                                   SCSI_PROT_REF_CHECK |
799                                                   SCSI_PROT_REF_INCREMENT |
800                                                   SCSI_PROT_IP_CHECKSUM,
801         };
802
803         return flag_mask[prot_op];
804 }
805
806 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
807                                            unsigned int dix, unsigned int dif)
808 {
809         struct request *rq = scsi_cmd_to_rq(scmd);
810         struct bio *bio = rq->bio;
811         unsigned int prot_op = sd_prot_op(rq_data_dir(rq), dix, dif);
812         unsigned int protect = 0;
813
814         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
815                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
816                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
817
818                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
819                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
820         }
821
822         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
823                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
824
825                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
826                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
827         }
828
829         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
830                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
831
832                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
833                         protect = 3 << 5;       /* Disable target PI checking */
834                 else
835                         protect = 1 << 5;       /* Enable target PI checking */
836         }
837
838         scsi_set_prot_op(scmd, prot_op);
839         scsi_set_prot_type(scmd, dif);
840         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
841
842         return protect;
843 }
844
845 static void sd_disable_discard(struct scsi_disk *sdkp)
846 {
847         sdkp->provisioning_mode = SD_LBP_DISABLE;
848         blk_queue_disable_discard(sdkp->disk->queue);
849 }
850
851 static void sd_config_discard(struct scsi_disk *sdkp, struct queue_limits *lim,
852                 unsigned int mode)
853 {
854         unsigned int logical_block_size = sdkp->device->sector_size;
855         unsigned int max_blocks = 0;
856
857         lim->discard_alignment = sdkp->unmap_alignment * logical_block_size;
858         lim->discard_granularity = max(sdkp->physical_block_size,
859                         sdkp->unmap_granularity * logical_block_size);
860         sdkp->provisioning_mode = mode;
861
862         switch (mode) {
863
864         case SD_LBP_FULL:
865         case SD_LBP_DISABLE:
866                 break;
867
868         case SD_LBP_UNMAP:
869                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
870                                           (u32)SD_MAX_WS16_BLOCKS);
871                 break;
872
873         case SD_LBP_WS16:
874                 if (sdkp->device->unmap_limit_for_ws)
875                         max_blocks = sdkp->max_unmap_blocks;
876                 else
877                         max_blocks = sdkp->max_ws_blocks;
878
879                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
880                 break;
881
882         case SD_LBP_WS10:
883                 if (sdkp->device->unmap_limit_for_ws)
884                         max_blocks = sdkp->max_unmap_blocks;
885                 else
886                         max_blocks = sdkp->max_ws_blocks;
887
888                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
889                 break;
890
891         case SD_LBP_ZERO:
892                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
893                                           (u32)SD_MAX_WS10_BLOCKS);
894                 break;
895         }
896
897         lim->max_hw_discard_sectors = max_blocks *
898                 (logical_block_size >> SECTOR_SHIFT);
899 }
900
901 static void *sd_set_special_bvec(struct request *rq, unsigned int data_len)
902 {
903         struct page *page;
904
905         page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
906         if (!page)
907                 return NULL;
908         clear_highpage(page);
909         bvec_set_page(&rq->special_vec, page, data_len, 0);
910         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
911         return bvec_virt(&rq->special_vec);
912 }
913
914 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
915 {
916         struct scsi_device *sdp = cmd->device;
917         struct request *rq = scsi_cmd_to_rq(cmd);
918         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
919         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
920         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
921         unsigned int data_len = 24;
922         char *buf;
923
924         buf = sd_set_special_bvec(rq, data_len);
925         if (!buf)
926                 return BLK_STS_RESOURCE;
927
928         cmd->cmd_len = 10;
929         cmd->cmnd[0] = UNMAP;
930         cmd->cmnd[8] = 24;
931
932         put_unaligned_be16(6 + 16, &buf[0]);
933         put_unaligned_be16(16, &buf[2]);
934         put_unaligned_be64(lba, &buf[8]);
935         put_unaligned_be32(nr_blocks, &buf[16]);
936
937         cmd->allowed = sdkp->max_retries;
938         cmd->transfersize = data_len;
939         rq->timeout = SD_TIMEOUT;
940
941         return scsi_alloc_sgtables(cmd);
942 }
943
944 static void sd_config_atomic(struct scsi_disk *sdkp, struct queue_limits *lim)
945 {
946         unsigned int logical_block_size = sdkp->device->sector_size,
947                 physical_block_size_sectors, max_atomic, unit_min, unit_max;
948
949         if ((!sdkp->max_atomic && !sdkp->max_atomic_with_boundary) ||
950             sdkp->protection_type == T10_PI_TYPE2_PROTECTION)
951                 return;
952
953         physical_block_size_sectors = sdkp->physical_block_size /
954                                         sdkp->device->sector_size;
955
956         unit_min = rounddown_pow_of_two(sdkp->atomic_granularity ?
957                                         sdkp->atomic_granularity :
958                                         physical_block_size_sectors);
959
960         /*
961          * Only use atomic boundary when we have the odd scenario of
962          * sdkp->max_atomic == 0, which the spec does permit.
963          */
964         if (sdkp->max_atomic) {
965                 max_atomic = sdkp->max_atomic;
966                 unit_max = rounddown_pow_of_two(sdkp->max_atomic);
967                 sdkp->use_atomic_write_boundary = 0;
968         } else {
969                 max_atomic = sdkp->max_atomic_with_boundary;
970                 unit_max = rounddown_pow_of_two(sdkp->max_atomic_boundary);
971                 sdkp->use_atomic_write_boundary = 1;
972         }
973
974         /*
975          * Ensure compliance with granularity and alignment. For now, keep it
976          * simple and just don't support atomic writes for values mismatched
977          * with max_{boundary}atomic, physical block size, and
978          * atomic_granularity itself.
979          *
980          * We're really being distrustful by checking unit_max also...
981          */
982         if (sdkp->atomic_granularity > 1) {
983                 if (unit_min > 1 && unit_min % sdkp->atomic_granularity)
984                         return;
985                 if (unit_max > 1 && unit_max % sdkp->atomic_granularity)
986                         return;
987         }
988
989         if (sdkp->atomic_alignment > 1) {
990                 if (unit_min > 1 && unit_min % sdkp->atomic_alignment)
991                         return;
992                 if (unit_max > 1 && unit_max % sdkp->atomic_alignment)
993                         return;
994         }
995
996         lim->atomic_write_hw_max = max_atomic * logical_block_size;
997         lim->atomic_write_hw_boundary = 0;
998         lim->atomic_write_hw_unit_min = unit_min * logical_block_size;
999         lim->atomic_write_hw_unit_max = unit_max * logical_block_size;
1000 }
1001
1002 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
1003                 bool unmap)
1004 {
1005         struct scsi_device *sdp = cmd->device;
1006         struct request *rq = scsi_cmd_to_rq(cmd);
1007         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1008         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1009         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1010         u32 data_len = sdp->sector_size;
1011
1012         if (!sd_set_special_bvec(rq, data_len))
1013                 return BLK_STS_RESOURCE;
1014
1015         cmd->cmd_len = 16;
1016         cmd->cmnd[0] = WRITE_SAME_16;
1017         if (unmap)
1018                 cmd->cmnd[1] = 0x8; /* UNMAP */
1019         put_unaligned_be64(lba, &cmd->cmnd[2]);
1020         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1021
1022         cmd->allowed = sdkp->max_retries;
1023         cmd->transfersize = data_len;
1024         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
1025
1026         return scsi_alloc_sgtables(cmd);
1027 }
1028
1029 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
1030                 bool unmap)
1031 {
1032         struct scsi_device *sdp = cmd->device;
1033         struct request *rq = scsi_cmd_to_rq(cmd);
1034         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1035         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1036         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1037         u32 data_len = sdp->sector_size;
1038
1039         if (!sd_set_special_bvec(rq, data_len))
1040                 return BLK_STS_RESOURCE;
1041
1042         cmd->cmd_len = 10;
1043         cmd->cmnd[0] = WRITE_SAME;
1044         if (unmap)
1045                 cmd->cmnd[1] = 0x8; /* UNMAP */
1046         put_unaligned_be32(lba, &cmd->cmnd[2]);
1047         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1048
1049         cmd->allowed = sdkp->max_retries;
1050         cmd->transfersize = data_len;
1051         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
1052
1053         return scsi_alloc_sgtables(cmd);
1054 }
1055
1056 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
1057 {
1058         struct request *rq = scsi_cmd_to_rq(cmd);
1059         struct scsi_device *sdp = cmd->device;
1060         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1061         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1062         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1063
1064         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
1065                 switch (sdkp->zeroing_mode) {
1066                 case SD_ZERO_WS16_UNMAP:
1067                         return sd_setup_write_same16_cmnd(cmd, true);
1068                 case SD_ZERO_WS10_UNMAP:
1069                         return sd_setup_write_same10_cmnd(cmd, true);
1070                 }
1071         }
1072
1073         if (sdp->no_write_same) {
1074                 rq->rq_flags |= RQF_QUIET;
1075                 return BLK_STS_TARGET;
1076         }
1077
1078         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
1079                 return sd_setup_write_same16_cmnd(cmd, false);
1080
1081         return sd_setup_write_same10_cmnd(cmd, false);
1082 }
1083
1084 static void sd_disable_write_same(struct scsi_disk *sdkp)
1085 {
1086         sdkp->device->no_write_same = 1;
1087         sdkp->max_ws_blocks = 0;
1088         blk_queue_disable_write_zeroes(sdkp->disk->queue);
1089 }
1090
1091 static void sd_config_write_same(struct scsi_disk *sdkp,
1092                 struct queue_limits *lim)
1093 {
1094         unsigned int logical_block_size = sdkp->device->sector_size;
1095
1096         if (sdkp->device->no_write_same) {
1097                 sdkp->max_ws_blocks = 0;
1098                 goto out;
1099         }
1100
1101         /* Some devices can not handle block counts above 0xffff despite
1102          * supporting WRITE SAME(16). Consequently we default to 64k
1103          * blocks per I/O unless the device explicitly advertises a
1104          * bigger limit.
1105          */
1106         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
1107                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
1108                                                    (u32)SD_MAX_WS16_BLOCKS);
1109         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
1110                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
1111                                                    (u32)SD_MAX_WS10_BLOCKS);
1112         else {
1113                 sdkp->device->no_write_same = 1;
1114                 sdkp->max_ws_blocks = 0;
1115         }
1116
1117         if (sdkp->lbprz && sdkp->lbpws)
1118                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
1119         else if (sdkp->lbprz && sdkp->lbpws10)
1120                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
1121         else if (sdkp->max_ws_blocks)
1122                 sdkp->zeroing_mode = SD_ZERO_WS;
1123         else
1124                 sdkp->zeroing_mode = SD_ZERO_WRITE;
1125
1126         if (sdkp->max_ws_blocks &&
1127             sdkp->physical_block_size > logical_block_size) {
1128                 /*
1129                  * Reporting a maximum number of blocks that is not aligned
1130                  * on the device physical size would cause a large write same
1131                  * request to be split into physically unaligned chunks by
1132                  * __blkdev_issue_write_zeroes() even if the caller of this
1133                  * functions took care to align the large request. So make sure
1134                  * the maximum reported is aligned to the device physical block
1135                  * size. This is only an optional optimization for regular
1136                  * disks, but this is mandatory to avoid failure of large write
1137                  * same requests directed at sequential write required zones of
1138                  * host-managed ZBC disks.
1139                  */
1140                 sdkp->max_ws_blocks =
1141                         round_down(sdkp->max_ws_blocks,
1142                                    bytes_to_logical(sdkp->device,
1143                                                     sdkp->physical_block_size));
1144         }
1145
1146 out:
1147         lim->max_write_zeroes_sectors =
1148                 sdkp->max_ws_blocks * (logical_block_size >> SECTOR_SHIFT);
1149 }
1150
1151 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1152 {
1153         struct request *rq = scsi_cmd_to_rq(cmd);
1154         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1155
1156         /* flush requests don't perform I/O, zero the S/G table */
1157         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1158
1159         if (cmd->device->use_16_for_sync) {
1160                 cmd->cmnd[0] = SYNCHRONIZE_CACHE_16;
1161                 cmd->cmd_len = 16;
1162         } else {
1163                 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1164                 cmd->cmd_len = 10;
1165         }
1166         cmd->transfersize = 0;
1167         cmd->allowed = sdkp->max_retries;
1168
1169         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1170         return BLK_STS_OK;
1171 }
1172
1173 /**
1174  * sd_group_number() - Compute the GROUP NUMBER field
1175  * @cmd: SCSI command for which to compute the value of the six-bit GROUP NUMBER
1176  *      field.
1177  *
1178  * From SBC-5 r05 (https://www.t10.org/cgi-bin/ac.pl?t=f&f=sbc5r05.pdf):
1179  * 0: no relative lifetime.
1180  * 1: shortest relative lifetime.
1181  * 2: second shortest relative lifetime.
1182  * 3 - 0x3d: intermediate relative lifetimes.
1183  * 0x3e: second longest relative lifetime.
1184  * 0x3f: longest relative lifetime.
1185  */
1186 static u8 sd_group_number(struct scsi_cmnd *cmd)
1187 {
1188         const struct request *rq = scsi_cmd_to_rq(cmd);
1189         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1190
1191         if (!sdkp->rscs)
1192                 return 0;
1193
1194         return min3((u32)rq->write_hint, (u32)sdkp->permanent_stream_count,
1195                     0x3fu);
1196 }
1197
1198 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1199                                        sector_t lba, unsigned int nr_blocks,
1200                                        unsigned char flags, unsigned int dld)
1201 {
1202         cmd->cmd_len = SD_EXT_CDB_SIZE;
1203         cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
1204         cmd->cmnd[6]  = sd_group_number(cmd);
1205         cmd->cmnd[7]  = 0x18; /* Additional CDB len */
1206         cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
1207         cmd->cmnd[10] = flags;
1208         cmd->cmnd[11] = dld & 0x07;
1209         put_unaligned_be64(lba, &cmd->cmnd[12]);
1210         put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
1211         put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
1212
1213         return BLK_STS_OK;
1214 }
1215
1216 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1217                                        sector_t lba, unsigned int nr_blocks,
1218                                        unsigned char flags, unsigned int dld)
1219 {
1220         cmd->cmd_len  = 16;
1221         cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
1222         cmd->cmnd[1]  = flags | ((dld >> 2) & 0x01);
1223         cmd->cmnd[14] = ((dld & 0x03) << 6) | sd_group_number(cmd);
1224         cmd->cmnd[15] = 0;
1225         put_unaligned_be64(lba, &cmd->cmnd[2]);
1226         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1227
1228         return BLK_STS_OK;
1229 }
1230
1231 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1232                                        sector_t lba, unsigned int nr_blocks,
1233                                        unsigned char flags)
1234 {
1235         cmd->cmd_len = 10;
1236         cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1237         cmd->cmnd[1] = flags;
1238         cmd->cmnd[6] = sd_group_number(cmd);
1239         cmd->cmnd[9] = 0;
1240         put_unaligned_be32(lba, &cmd->cmnd[2]);
1241         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1242
1243         return BLK_STS_OK;
1244 }
1245
1246 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1247                                       sector_t lba, unsigned int nr_blocks,
1248                                       unsigned char flags)
1249 {
1250         /* Avoid that 0 blocks gets translated into 256 blocks. */
1251         if (WARN_ON_ONCE(nr_blocks == 0))
1252                 return BLK_STS_IOERR;
1253
1254         if (unlikely(flags & 0x8)) {
1255                 /*
1256                  * This happens only if this drive failed 10byte rw
1257                  * command with ILLEGAL_REQUEST during operation and
1258                  * thus turned off use_10_for_rw.
1259                  */
1260                 scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1261                 return BLK_STS_IOERR;
1262         }
1263
1264         cmd->cmd_len = 6;
1265         cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1266         cmd->cmnd[1] = (lba >> 16) & 0x1f;
1267         cmd->cmnd[2] = (lba >> 8) & 0xff;
1268         cmd->cmnd[3] = lba & 0xff;
1269         cmd->cmnd[4] = nr_blocks;
1270         cmd->cmnd[5] = 0;
1271
1272         return BLK_STS_OK;
1273 }
1274
1275 /*
1276  * Check if a command has a duration limit set. If it does, and the target
1277  * device supports CDL and the feature is enabled, return the limit
1278  * descriptor index to use. Return 0 (no limit) otherwise.
1279  */
1280 static int sd_cdl_dld(struct scsi_disk *sdkp, struct scsi_cmnd *scmd)
1281 {
1282         struct scsi_device *sdp = sdkp->device;
1283         int hint;
1284
1285         if (!sdp->cdl_supported || !sdp->cdl_enable)
1286                 return 0;
1287
1288         /*
1289          * Use "no limit" if the request ioprio does not specify a duration
1290          * limit hint.
1291          */
1292         hint = IOPRIO_PRIO_HINT(req_get_ioprio(scsi_cmd_to_rq(scmd)));
1293         if (hint < IOPRIO_HINT_DEV_DURATION_LIMIT_1 ||
1294             hint > IOPRIO_HINT_DEV_DURATION_LIMIT_7)
1295                 return 0;
1296
1297         return (hint - IOPRIO_HINT_DEV_DURATION_LIMIT_1) + 1;
1298 }
1299
1300 static blk_status_t sd_setup_atomic_cmnd(struct scsi_cmnd *cmd,
1301                                         sector_t lba, unsigned int nr_blocks,
1302                                         bool boundary, unsigned char flags)
1303 {
1304         cmd->cmd_len  = 16;
1305         cmd->cmnd[0]  = WRITE_ATOMIC_16;
1306         cmd->cmnd[1]  = flags;
1307         put_unaligned_be64(lba, &cmd->cmnd[2]);
1308         put_unaligned_be16(nr_blocks, &cmd->cmnd[12]);
1309         if (boundary)
1310                 put_unaligned_be16(nr_blocks, &cmd->cmnd[10]);
1311         else
1312                 put_unaligned_be16(0, &cmd->cmnd[10]);
1313         put_unaligned_be16(nr_blocks, &cmd->cmnd[12]);
1314         cmd->cmnd[14] = 0;
1315         cmd->cmnd[15] = 0;
1316
1317         return BLK_STS_OK;
1318 }
1319
1320 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1321 {
1322         struct request *rq = scsi_cmd_to_rq(cmd);
1323         struct scsi_device *sdp = cmd->device;
1324         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1325         sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1326         sector_t threshold;
1327         unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1328         unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1329         bool write = rq_data_dir(rq) == WRITE;
1330         unsigned char protect, fua;
1331         unsigned int dld;
1332         blk_status_t ret;
1333         unsigned int dif;
1334         bool dix;
1335
1336         ret = scsi_alloc_sgtables(cmd);
1337         if (ret != BLK_STS_OK)
1338                 return ret;
1339
1340         ret = BLK_STS_IOERR;
1341         if (!scsi_device_online(sdp) || sdp->changed) {
1342                 scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1343                 goto fail;
1344         }
1345
1346         if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->q->disk)) {
1347                 scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1348                 goto fail;
1349         }
1350
1351         if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1352                 scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1353                 goto fail;
1354         }
1355
1356         /*
1357          * Some SD card readers can't handle accesses which touch the
1358          * last one or two logical blocks. Split accesses as needed.
1359          */
1360         threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1361
1362         if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1363                 if (lba < threshold) {
1364                         /* Access up to the threshold but not beyond */
1365                         nr_blocks = threshold - lba;
1366                 } else {
1367                         /* Access only a single logical block */
1368                         nr_blocks = 1;
1369                 }
1370         }
1371
1372         fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1373         dix = scsi_prot_sg_count(cmd);
1374         dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
1375         dld = sd_cdl_dld(sdkp, cmd);
1376
1377         if (dif || dix)
1378                 protect = sd_setup_protect_cmnd(cmd, dix, dif);
1379         else
1380                 protect = 0;
1381
1382         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1383                 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1384                                          protect | fua, dld);
1385         } else if (rq->cmd_flags & REQ_ATOMIC && write) {
1386                 ret = sd_setup_atomic_cmnd(cmd, lba, nr_blocks,
1387                                 sdkp->use_atomic_write_boundary,
1388                                 protect | fua);
1389         } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1390                 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1391                                          protect | fua, dld);
1392         } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1393                    sdp->use_10_for_rw || protect || rq->write_hint) {
1394                 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1395                                          protect | fua);
1396         } else {
1397                 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1398                                         protect | fua);
1399         }
1400
1401         if (unlikely(ret != BLK_STS_OK))
1402                 goto fail;
1403
1404         /*
1405          * We shouldn't disconnect in the middle of a sector, so with a dumb
1406          * host adapter, it's safe to assume that we can at least transfer
1407          * this many bytes between each connect / disconnect.
1408          */
1409         cmd->transfersize = sdp->sector_size;
1410         cmd->underflow = nr_blocks << 9;
1411         cmd->allowed = sdkp->max_retries;
1412         cmd->sdb.length = nr_blocks * sdp->sector_size;
1413
1414         SCSI_LOG_HLQUEUE(1,
1415                          scmd_printk(KERN_INFO, cmd,
1416                                      "%s: block=%llu, count=%d\n", __func__,
1417                                      (unsigned long long)blk_rq_pos(rq),
1418                                      blk_rq_sectors(rq)));
1419         SCSI_LOG_HLQUEUE(2,
1420                          scmd_printk(KERN_INFO, cmd,
1421                                      "%s %d/%u 512 byte blocks.\n",
1422                                      write ? "writing" : "reading", nr_blocks,
1423                                      blk_rq_sectors(rq)));
1424
1425         /*
1426          * This indicates that the command is ready from our end to be queued.
1427          */
1428         return BLK_STS_OK;
1429 fail:
1430         scsi_free_sgtables(cmd);
1431         return ret;
1432 }
1433
1434 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1435 {
1436         struct request *rq = scsi_cmd_to_rq(cmd);
1437
1438         switch (req_op(rq)) {
1439         case REQ_OP_DISCARD:
1440                 switch (scsi_disk(rq->q->disk)->provisioning_mode) {
1441                 case SD_LBP_UNMAP:
1442                         return sd_setup_unmap_cmnd(cmd);
1443                 case SD_LBP_WS16:
1444                         return sd_setup_write_same16_cmnd(cmd, true);
1445                 case SD_LBP_WS10:
1446                         return sd_setup_write_same10_cmnd(cmd, true);
1447                 case SD_LBP_ZERO:
1448                         return sd_setup_write_same10_cmnd(cmd, false);
1449                 default:
1450                         return BLK_STS_TARGET;
1451                 }
1452         case REQ_OP_WRITE_ZEROES:
1453                 return sd_setup_write_zeroes_cmnd(cmd);
1454         case REQ_OP_FLUSH:
1455                 return sd_setup_flush_cmnd(cmd);
1456         case REQ_OP_READ:
1457         case REQ_OP_WRITE:
1458                 return sd_setup_read_write_cmnd(cmd);
1459         case REQ_OP_ZONE_RESET:
1460                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1461                                                    false);
1462         case REQ_OP_ZONE_RESET_ALL:
1463                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1464                                                    true);
1465         case REQ_OP_ZONE_OPEN:
1466                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false);
1467         case REQ_OP_ZONE_CLOSE:
1468                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false);
1469         case REQ_OP_ZONE_FINISH:
1470                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false);
1471         default:
1472                 WARN_ON_ONCE(1);
1473                 return BLK_STS_NOTSUPP;
1474         }
1475 }
1476
1477 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1478 {
1479         struct request *rq = scsi_cmd_to_rq(SCpnt);
1480
1481         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1482                 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1483 }
1484
1485 static bool sd_need_revalidate(struct gendisk *disk, struct scsi_disk *sdkp)
1486 {
1487         if (sdkp->device->removable || sdkp->write_prot) {
1488                 if (disk_check_media_change(disk))
1489                         return true;
1490         }
1491
1492         /*
1493          * Force a full rescan after ioctl(BLKRRPART).  While the disk state has
1494          * nothing to do with partitions, BLKRRPART is used to force a full
1495          * revalidate after things like a format for historical reasons.
1496          */
1497         return test_bit(GD_NEED_PART_SCAN, &disk->state);
1498 }
1499
1500 /**
1501  *      sd_open - open a scsi disk device
1502  *      @disk: disk to open
1503  *      @mode: open mode
1504  *
1505  *      Returns 0 if successful. Returns a negated errno value in case 
1506  *      of error.
1507  *
1508  *      Note: This can be called from a user context (e.g. fsck(1) )
1509  *      or from within the kernel (e.g. as a result of a mount(1) ).
1510  *      In the latter case @inode and @filp carry an abridged amount
1511  *      of information as noted above.
1512  *
1513  *      Locking: called with disk->open_mutex held.
1514  **/
1515 static int sd_open(struct gendisk *disk, blk_mode_t mode)
1516 {
1517         struct scsi_disk *sdkp = scsi_disk(disk);
1518         struct scsi_device *sdev = sdkp->device;
1519         int retval;
1520
1521         if (scsi_device_get(sdev))
1522                 return -ENXIO;
1523
1524         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1525
1526         /*
1527          * If the device is in error recovery, wait until it is done.
1528          * If the device is offline, then disallow any access to it.
1529          */
1530         retval = -ENXIO;
1531         if (!scsi_block_when_processing_errors(sdev))
1532                 goto error_out;
1533
1534         if (sd_need_revalidate(disk, sdkp))
1535                 sd_revalidate_disk(disk);
1536
1537         /*
1538          * If the drive is empty, just let the open fail.
1539          */
1540         retval = -ENOMEDIUM;
1541         if (sdev->removable && !sdkp->media_present &&
1542             !(mode & BLK_OPEN_NDELAY))
1543                 goto error_out;
1544
1545         /*
1546          * If the device has the write protect tab set, have the open fail
1547          * if the user expects to be able to write to the thing.
1548          */
1549         retval = -EROFS;
1550         if (sdkp->write_prot && (mode & BLK_OPEN_WRITE))
1551                 goto error_out;
1552
1553         /*
1554          * It is possible that the disk changing stuff resulted in
1555          * the device being taken offline.  If this is the case,
1556          * report this to the user, and don't pretend that the
1557          * open actually succeeded.
1558          */
1559         retval = -ENXIO;
1560         if (!scsi_device_online(sdev))
1561                 goto error_out;
1562
1563         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1564                 if (scsi_block_when_processing_errors(sdev))
1565                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1566         }
1567
1568         return 0;
1569
1570 error_out:
1571         scsi_device_put(sdev);
1572         return retval;  
1573 }
1574
1575 /**
1576  *      sd_release - invoked when the (last) close(2) is called on this
1577  *      scsi disk.
1578  *      @disk: disk to release
1579  *
1580  *      Returns 0. 
1581  *
1582  *      Note: may block (uninterruptible) if error recovery is underway
1583  *      on this disk.
1584  *
1585  *      Locking: called with disk->open_mutex held.
1586  **/
1587 static void sd_release(struct gendisk *disk)
1588 {
1589         struct scsi_disk *sdkp = scsi_disk(disk);
1590         struct scsi_device *sdev = sdkp->device;
1591
1592         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1593
1594         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1595                 if (scsi_block_when_processing_errors(sdev))
1596                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1597         }
1598
1599         scsi_device_put(sdev);
1600 }
1601
1602 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1603 {
1604         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1605         struct scsi_device *sdp = sdkp->device;
1606         struct Scsi_Host *host = sdp->host;
1607         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1608         int diskinfo[4];
1609
1610         /* default to most commonly used values */
1611         diskinfo[0] = 0x40;     /* 1 << 6 */
1612         diskinfo[1] = 0x20;     /* 1 << 5 */
1613         diskinfo[2] = capacity >> 11;
1614
1615         /* override with calculated, extended default, or driver values */
1616         if (host->hostt->bios_param)
1617                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1618         else
1619                 scsicam_bios_param(bdev, capacity, diskinfo);
1620
1621         geo->heads = diskinfo[0];
1622         geo->sectors = diskinfo[1];
1623         geo->cylinders = diskinfo[2];
1624         return 0;
1625 }
1626
1627 /**
1628  *      sd_ioctl - process an ioctl
1629  *      @bdev: target block device
1630  *      @mode: open mode
1631  *      @cmd: ioctl command number
1632  *      @arg: this is third argument given to ioctl(2) system call.
1633  *      Often contains a pointer.
1634  *
1635  *      Returns 0 if successful (some ioctls return positive numbers on
1636  *      success as well). Returns a negated errno value in case of error.
1637  *
1638  *      Note: most ioctls are forward onto the block subsystem or further
1639  *      down in the scsi subsystem.
1640  **/
1641 static int sd_ioctl(struct block_device *bdev, blk_mode_t mode,
1642                     unsigned int cmd, unsigned long arg)
1643 {
1644         struct gendisk *disk = bdev->bd_disk;
1645         struct scsi_disk *sdkp = scsi_disk(disk);
1646         struct scsi_device *sdp = sdkp->device;
1647         void __user *p = (void __user *)arg;
1648         int error;
1649     
1650         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1651                                     "cmd=0x%x\n", disk->disk_name, cmd));
1652
1653         if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
1654                 return -ENOIOCTLCMD;
1655
1656         /*
1657          * If we are in the middle of error recovery, don't let anyone
1658          * else try and use this device.  Also, if error recovery fails, it
1659          * may try and take the device offline, in which case all further
1660          * access to the device is prohibited.
1661          */
1662         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1663                         (mode & BLK_OPEN_NDELAY));
1664         if (error)
1665                 return error;
1666
1667         if (is_sed_ioctl(cmd))
1668                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1669         return scsi_ioctl(sdp, mode & BLK_OPEN_WRITE, cmd, p);
1670 }
1671
1672 static void set_media_not_present(struct scsi_disk *sdkp)
1673 {
1674         if (sdkp->media_present)
1675                 sdkp->device->changed = 1;
1676
1677         if (sdkp->device->removable) {
1678                 sdkp->media_present = 0;
1679                 sdkp->capacity = 0;
1680         }
1681 }
1682
1683 static int media_not_present(struct scsi_disk *sdkp,
1684                              struct scsi_sense_hdr *sshdr)
1685 {
1686         if (!scsi_sense_valid(sshdr))
1687                 return 0;
1688
1689         /* not invoked for commands that could return deferred errors */
1690         switch (sshdr->sense_key) {
1691         case UNIT_ATTENTION:
1692         case NOT_READY:
1693                 /* medium not present */
1694                 if (sshdr->asc == 0x3A) {
1695                         set_media_not_present(sdkp);
1696                         return 1;
1697                 }
1698         }
1699         return 0;
1700 }
1701
1702 /**
1703  *      sd_check_events - check media events
1704  *      @disk: kernel device descriptor
1705  *      @clearing: disk events currently being cleared
1706  *
1707  *      Returns mask of DISK_EVENT_*.
1708  *
1709  *      Note: this function is invoked from the block subsystem.
1710  **/
1711 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1712 {
1713         struct scsi_disk *sdkp = disk->private_data;
1714         struct scsi_device *sdp;
1715         int retval;
1716         bool disk_changed;
1717
1718         if (!sdkp)
1719                 return 0;
1720
1721         sdp = sdkp->device;
1722         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1723
1724         /*
1725          * If the device is offline, don't send any commands - just pretend as
1726          * if the command failed.  If the device ever comes back online, we
1727          * can deal with it then.  It is only because of unrecoverable errors
1728          * that we would ever take a device offline in the first place.
1729          */
1730         if (!scsi_device_online(sdp)) {
1731                 set_media_not_present(sdkp);
1732                 goto out;
1733         }
1734
1735         /*
1736          * Using TEST_UNIT_READY enables differentiation between drive with
1737          * no cartridge loaded - NOT READY, drive with changed cartridge -
1738          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1739          *
1740          * Drives that auto spin down. eg iomega jaz 1G, will be started
1741          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1742          * sd_revalidate() is called.
1743          */
1744         if (scsi_block_when_processing_errors(sdp)) {
1745                 struct scsi_sense_hdr sshdr = { 0, };
1746
1747                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, sdkp->max_retries,
1748                                               &sshdr);
1749
1750                 /* failed to execute TUR, assume media not present */
1751                 if (retval < 0 || host_byte(retval)) {
1752                         set_media_not_present(sdkp);
1753                         goto out;
1754                 }
1755
1756                 if (media_not_present(sdkp, &sshdr))
1757                         goto out;
1758         }
1759
1760         /*
1761          * For removable scsi disk we have to recognise the presence
1762          * of a disk in the drive.
1763          */
1764         if (!sdkp->media_present)
1765                 sdp->changed = 1;
1766         sdkp->media_present = 1;
1767 out:
1768         /*
1769          * sdp->changed is set under the following conditions:
1770          *
1771          *      Medium present state has changed in either direction.
1772          *      Device has indicated UNIT_ATTENTION.
1773          */
1774         disk_changed = sdp->changed;
1775         sdp->changed = 0;
1776         return disk_changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1777 }
1778
1779 static int sd_sync_cache(struct scsi_disk *sdkp)
1780 {
1781         int res;
1782         struct scsi_device *sdp = sdkp->device;
1783         const int timeout = sdp->request_queue->rq_timeout
1784                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1785         /* Leave the rest of the command zero to indicate flush everything. */
1786         const unsigned char cmd[16] = { sdp->use_16_for_sync ?
1787                                 SYNCHRONIZE_CACHE_16 : SYNCHRONIZE_CACHE };
1788         struct scsi_sense_hdr sshdr;
1789         struct scsi_failure failure_defs[] = {
1790                 {
1791                         .allowed = 3,
1792                         .result = SCMD_FAILURE_RESULT_ANY,
1793                 },
1794                 {}
1795         };
1796         struct scsi_failures failures = {
1797                 .failure_definitions = failure_defs,
1798         };
1799         const struct scsi_exec_args exec_args = {
1800                 .req_flags = BLK_MQ_REQ_PM,
1801                 .sshdr = &sshdr,
1802                 .failures = &failures,
1803         };
1804
1805         if (!scsi_device_online(sdp))
1806                 return -ENODEV;
1807
1808         res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, timeout,
1809                                sdkp->max_retries, &exec_args);
1810         if (res) {
1811                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1812
1813                 if (res < 0)
1814                         return res;
1815
1816                 if (scsi_status_is_check_condition(res) &&
1817                     scsi_sense_valid(&sshdr)) {
1818                         sd_print_sense_hdr(sdkp, &sshdr);
1819
1820                         /* we need to evaluate the error return  */
1821                         if (sshdr.asc == 0x3a ||        /* medium not present */
1822                             sshdr.asc == 0x20 ||        /* invalid command */
1823                             (sshdr.asc == 0x74 && sshdr.ascq == 0x71))  /* drive is password locked */
1824                                 /* this is no error here */
1825                                 return 0;
1826                         /*
1827                          * This drive doesn't support sync and there's not much
1828                          * we can do because this is called during shutdown
1829                          * or suspend so just return success so those operations
1830                          * can proceed.
1831                          */
1832                         if (sshdr.sense_key == ILLEGAL_REQUEST)
1833                                 return 0;
1834                 }
1835
1836                 switch (host_byte(res)) {
1837                 /* ignore errors due to racing a disconnection */
1838                 case DID_BAD_TARGET:
1839                 case DID_NO_CONNECT:
1840                         return 0;
1841                 /* signal the upper layer it might try again */
1842                 case DID_BUS_BUSY:
1843                 case DID_IMM_RETRY:
1844                 case DID_REQUEUE:
1845                 case DID_SOFT_ERROR:
1846                         return -EBUSY;
1847                 default:
1848                         return -EIO;
1849                 }
1850         }
1851         return 0;
1852 }
1853
1854 static void sd_rescan(struct device *dev)
1855 {
1856         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1857
1858         sd_revalidate_disk(sdkp->disk);
1859 }
1860
1861 static int sd_get_unique_id(struct gendisk *disk, u8 id[16],
1862                 enum blk_unique_id type)
1863 {
1864         struct scsi_device *sdev = scsi_disk(disk)->device;
1865         const struct scsi_vpd *vpd;
1866         const unsigned char *d;
1867         int ret = -ENXIO, len;
1868
1869         rcu_read_lock();
1870         vpd = rcu_dereference(sdev->vpd_pg83);
1871         if (!vpd)
1872                 goto out_unlock;
1873
1874         ret = -EINVAL;
1875         for (d = vpd->data + 4; d < vpd->data + vpd->len; d += d[3] + 4) {
1876                 /* we only care about designators with LU association */
1877                 if (((d[1] >> 4) & 0x3) != 0x00)
1878                         continue;
1879                 if ((d[1] & 0xf) != type)
1880                         continue;
1881
1882                 /*
1883                  * Only exit early if a 16-byte descriptor was found.  Otherwise
1884                  * keep looking as one with more entropy might still show up.
1885                  */
1886                 len = d[3];
1887                 if (len != 8 && len != 12 && len != 16)
1888                         continue;
1889                 ret = len;
1890                 memcpy(id, d + 4, len);
1891                 if (len == 16)
1892                         break;
1893         }
1894 out_unlock:
1895         rcu_read_unlock();
1896         return ret;
1897 }
1898
1899 static int sd_scsi_to_pr_err(struct scsi_sense_hdr *sshdr, int result)
1900 {
1901         switch (host_byte(result)) {
1902         case DID_TRANSPORT_MARGINAL:
1903         case DID_TRANSPORT_DISRUPTED:
1904         case DID_BUS_BUSY:
1905                 return PR_STS_RETRY_PATH_FAILURE;
1906         case DID_NO_CONNECT:
1907                 return PR_STS_PATH_FAILED;
1908         case DID_TRANSPORT_FAILFAST:
1909                 return PR_STS_PATH_FAST_FAILED;
1910         }
1911
1912         switch (status_byte(result)) {
1913         case SAM_STAT_RESERVATION_CONFLICT:
1914                 return PR_STS_RESERVATION_CONFLICT;
1915         case SAM_STAT_CHECK_CONDITION:
1916                 if (!scsi_sense_valid(sshdr))
1917                         return PR_STS_IOERR;
1918
1919                 if (sshdr->sense_key == ILLEGAL_REQUEST &&
1920                     (sshdr->asc == 0x26 || sshdr->asc == 0x24))
1921                         return -EINVAL;
1922
1923                 fallthrough;
1924         default:
1925                 return PR_STS_IOERR;
1926         }
1927 }
1928
1929 static int sd_pr_in_command(struct block_device *bdev, u8 sa,
1930                             unsigned char *data, int data_len)
1931 {
1932         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1933         struct scsi_device *sdev = sdkp->device;
1934         struct scsi_sense_hdr sshdr;
1935         u8 cmd[10] = { PERSISTENT_RESERVE_IN, sa };
1936         struct scsi_failure failure_defs[] = {
1937                 {
1938                         .sense = UNIT_ATTENTION,
1939                         .asc = SCMD_FAILURE_ASC_ANY,
1940                         .ascq = SCMD_FAILURE_ASCQ_ANY,
1941                         .allowed = 5,
1942                         .result = SAM_STAT_CHECK_CONDITION,
1943                 },
1944                 {}
1945         };
1946         struct scsi_failures failures = {
1947                 .failure_definitions = failure_defs,
1948         };
1949         const struct scsi_exec_args exec_args = {
1950                 .sshdr = &sshdr,
1951                 .failures = &failures,
1952         };
1953         int result;
1954
1955         put_unaligned_be16(data_len, &cmd[7]);
1956
1957         result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, data, data_len,
1958                                   SD_TIMEOUT, sdkp->max_retries, &exec_args);
1959         if (scsi_status_is_check_condition(result) &&
1960             scsi_sense_valid(&sshdr)) {
1961                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1962                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1963         }
1964
1965         if (result <= 0)
1966                 return result;
1967
1968         return sd_scsi_to_pr_err(&sshdr, result);
1969 }
1970
1971 static int sd_pr_read_keys(struct block_device *bdev, struct pr_keys *keys_info)
1972 {
1973         int result, i, data_offset, num_copy_keys;
1974         u32 num_keys = keys_info->num_keys;
1975         int data_len = num_keys * 8 + 8;
1976         u8 *data;
1977
1978         data = kzalloc(data_len, GFP_KERNEL);
1979         if (!data)
1980                 return -ENOMEM;
1981
1982         result = sd_pr_in_command(bdev, READ_KEYS, data, data_len);
1983         if (result)
1984                 goto free_data;
1985
1986         keys_info->generation = get_unaligned_be32(&data[0]);
1987         keys_info->num_keys = get_unaligned_be32(&data[4]) / 8;
1988
1989         data_offset = 8;
1990         num_copy_keys = min(num_keys, keys_info->num_keys);
1991
1992         for (i = 0; i < num_copy_keys; i++) {
1993                 keys_info->keys[i] = get_unaligned_be64(&data[data_offset]);
1994                 data_offset += 8;
1995         }
1996
1997 free_data:
1998         kfree(data);
1999         return result;
2000 }
2001
2002 static int sd_pr_read_reservation(struct block_device *bdev,
2003                                   struct pr_held_reservation *rsv)
2004 {
2005         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
2006         struct scsi_device *sdev = sdkp->device;
2007         u8 data[24] = { };
2008         int result, len;
2009
2010         result = sd_pr_in_command(bdev, READ_RESERVATION, data, sizeof(data));
2011         if (result)
2012                 return result;
2013
2014         len = get_unaligned_be32(&data[4]);
2015         if (!len)
2016                 return 0;
2017
2018         /* Make sure we have at least the key and type */
2019         if (len < 14) {
2020                 sdev_printk(KERN_INFO, sdev,
2021                             "READ RESERVATION failed due to short return buffer of %d bytes\n",
2022                             len);
2023                 return -EINVAL;
2024         }
2025
2026         rsv->generation = get_unaligned_be32(&data[0]);
2027         rsv->key = get_unaligned_be64(&data[8]);
2028         rsv->type = scsi_pr_type_to_block(data[21] & 0x0f);
2029         return 0;
2030 }
2031
2032 static int sd_pr_out_command(struct block_device *bdev, u8 sa, u64 key,
2033                              u64 sa_key, enum scsi_pr_type type, u8 flags)
2034 {
2035         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
2036         struct scsi_device *sdev = sdkp->device;
2037         struct scsi_sense_hdr sshdr;
2038         struct scsi_failure failure_defs[] = {
2039                 {
2040                         .sense = UNIT_ATTENTION,
2041                         .asc = SCMD_FAILURE_ASC_ANY,
2042                         .ascq = SCMD_FAILURE_ASCQ_ANY,
2043                         .allowed = 5,
2044                         .result = SAM_STAT_CHECK_CONDITION,
2045                 },
2046                 {}
2047         };
2048         struct scsi_failures failures = {
2049                 .failure_definitions = failure_defs,
2050         };
2051         const struct scsi_exec_args exec_args = {
2052                 .sshdr = &sshdr,
2053                 .failures = &failures,
2054         };
2055         int result;
2056         u8 cmd[16] = { 0, };
2057         u8 data[24] = { 0, };
2058
2059         cmd[0] = PERSISTENT_RESERVE_OUT;
2060         cmd[1] = sa;
2061         cmd[2] = type;
2062         put_unaligned_be32(sizeof(data), &cmd[5]);
2063
2064         put_unaligned_be64(key, &data[0]);
2065         put_unaligned_be64(sa_key, &data[8]);
2066         data[20] = flags;
2067
2068         result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_OUT, &data,
2069                                   sizeof(data), SD_TIMEOUT, sdkp->max_retries,
2070                                   &exec_args);
2071
2072         if (scsi_status_is_check_condition(result) &&
2073             scsi_sense_valid(&sshdr)) {
2074                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
2075                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
2076         }
2077
2078         if (result <= 0)
2079                 return result;
2080
2081         return sd_scsi_to_pr_err(&sshdr, result);
2082 }
2083
2084 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
2085                 u32 flags)
2086 {
2087         if (flags & ~PR_FL_IGNORE_KEY)
2088                 return -EOPNOTSUPP;
2089         return sd_pr_out_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
2090                         old_key, new_key, 0,
2091                         (1 << 0) /* APTPL */);
2092 }
2093
2094 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
2095                 u32 flags)
2096 {
2097         if (flags)
2098                 return -EOPNOTSUPP;
2099         return sd_pr_out_command(bdev, 0x01, key, 0,
2100                                  block_pr_type_to_scsi(type), 0);
2101 }
2102
2103 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
2104 {
2105         return sd_pr_out_command(bdev, 0x02, key, 0,
2106                                  block_pr_type_to_scsi(type), 0);
2107 }
2108
2109 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
2110                 enum pr_type type, bool abort)
2111 {
2112         return sd_pr_out_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
2113                                  block_pr_type_to_scsi(type), 0);
2114 }
2115
2116 static int sd_pr_clear(struct block_device *bdev, u64 key)
2117 {
2118         return sd_pr_out_command(bdev, 0x03, key, 0, 0, 0);
2119 }
2120
2121 static const struct pr_ops sd_pr_ops = {
2122         .pr_register    = sd_pr_register,
2123         .pr_reserve     = sd_pr_reserve,
2124         .pr_release     = sd_pr_release,
2125         .pr_preempt     = sd_pr_preempt,
2126         .pr_clear       = sd_pr_clear,
2127         .pr_read_keys   = sd_pr_read_keys,
2128         .pr_read_reservation = sd_pr_read_reservation,
2129 };
2130
2131 static void scsi_disk_free_disk(struct gendisk *disk)
2132 {
2133         struct scsi_disk *sdkp = scsi_disk(disk);
2134
2135         put_device(&sdkp->disk_dev);
2136 }
2137
2138 static const struct block_device_operations sd_fops = {
2139         .owner                  = THIS_MODULE,
2140         .open                   = sd_open,
2141         .release                = sd_release,
2142         .ioctl                  = sd_ioctl,
2143         .getgeo                 = sd_getgeo,
2144         .compat_ioctl           = blkdev_compat_ptr_ioctl,
2145         .check_events           = sd_check_events,
2146         .unlock_native_capacity = sd_unlock_native_capacity,
2147         .report_zones           = sd_zbc_report_zones,
2148         .get_unique_id          = sd_get_unique_id,
2149         .free_disk              = scsi_disk_free_disk,
2150         .pr_ops                 = &sd_pr_ops,
2151 };
2152
2153 /**
2154  *      sd_eh_reset - reset error handling callback
2155  *      @scmd:          sd-issued command that has failed
2156  *
2157  *      This function is called by the SCSI midlayer before starting
2158  *      SCSI EH. When counting medium access failures we have to be
2159  *      careful to register it only only once per device and SCSI EH run;
2160  *      there might be several timed out commands which will cause the
2161  *      'max_medium_access_timeouts' counter to trigger after the first
2162  *      SCSI EH run already and set the device to offline.
2163  *      So this function resets the internal counter before starting SCSI EH.
2164  **/
2165 static void sd_eh_reset(struct scsi_cmnd *scmd)
2166 {
2167         struct scsi_disk *sdkp = scsi_disk(scsi_cmd_to_rq(scmd)->q->disk);
2168
2169         /* New SCSI EH run, reset gate variable */
2170         sdkp->ignore_medium_access_errors = false;
2171 }
2172
2173 /**
2174  *      sd_eh_action - error handling callback
2175  *      @scmd:          sd-issued command that has failed
2176  *      @eh_disp:       The recovery disposition suggested by the midlayer
2177  *
2178  *      This function is called by the SCSI midlayer upon completion of an
2179  *      error test command (currently TEST UNIT READY). The result of sending
2180  *      the eh command is passed in eh_disp.  We're looking for devices that
2181  *      fail medium access commands but are OK with non access commands like
2182  *      test unit ready (so wrongly see the device as having a successful
2183  *      recovery)
2184  **/
2185 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
2186 {
2187         struct scsi_disk *sdkp = scsi_disk(scsi_cmd_to_rq(scmd)->q->disk);
2188         struct scsi_device *sdev = scmd->device;
2189
2190         if (!scsi_device_online(sdev) ||
2191             !scsi_medium_access_command(scmd) ||
2192             host_byte(scmd->result) != DID_TIME_OUT ||
2193             eh_disp != SUCCESS)
2194                 return eh_disp;
2195
2196         /*
2197          * The device has timed out executing a medium access command.
2198          * However, the TEST UNIT READY command sent during error
2199          * handling completed successfully. Either the device is in the
2200          * process of recovering or has it suffered an internal failure
2201          * that prevents access to the storage medium.
2202          */
2203         if (!sdkp->ignore_medium_access_errors) {
2204                 sdkp->medium_access_timed_out++;
2205                 sdkp->ignore_medium_access_errors = true;
2206         }
2207
2208         /*
2209          * If the device keeps failing read/write commands but TEST UNIT
2210          * READY always completes successfully we assume that medium
2211          * access is no longer possible and take the device offline.
2212          */
2213         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
2214                 scmd_printk(KERN_ERR, scmd,
2215                             "Medium access timeout failure. Offlining disk!\n");
2216                 mutex_lock(&sdev->state_mutex);
2217                 scsi_device_set_state(sdev, SDEV_OFFLINE);
2218                 mutex_unlock(&sdev->state_mutex);
2219
2220                 return SUCCESS;
2221         }
2222
2223         return eh_disp;
2224 }
2225
2226 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
2227 {
2228         struct request *req = scsi_cmd_to_rq(scmd);
2229         struct scsi_device *sdev = scmd->device;
2230         unsigned int transferred, good_bytes;
2231         u64 start_lba, end_lba, bad_lba;
2232
2233         /*
2234          * Some commands have a payload smaller than the device logical
2235          * block size (e.g. INQUIRY on a 4K disk).
2236          */
2237         if (scsi_bufflen(scmd) <= sdev->sector_size)
2238                 return 0;
2239
2240         /* Check if we have a 'bad_lba' information */
2241         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
2242                                      SCSI_SENSE_BUFFERSIZE,
2243                                      &bad_lba))
2244                 return 0;
2245
2246         /*
2247          * If the bad lba was reported incorrectly, we have no idea where
2248          * the error is.
2249          */
2250         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
2251         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
2252         if (bad_lba < start_lba || bad_lba >= end_lba)
2253                 return 0;
2254
2255         /*
2256          * resid is optional but mostly filled in.  When it's unused,
2257          * its value is zero, so we assume the whole buffer transferred
2258          */
2259         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
2260
2261         /* This computation should always be done in terms of the
2262          * resolution of the device's medium.
2263          */
2264         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
2265
2266         return min(good_bytes, transferred);
2267 }
2268
2269 /**
2270  *      sd_done - bottom half handler: called when the lower level
2271  *      driver has completed (successfully or otherwise) a scsi command.
2272  *      @SCpnt: mid-level's per command structure.
2273  *
2274  *      Note: potentially run from within an ISR. Must not block.
2275  **/
2276 static int sd_done(struct scsi_cmnd *SCpnt)
2277 {
2278         int result = SCpnt->result;
2279         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
2280         unsigned int sector_size = SCpnt->device->sector_size;
2281         unsigned int resid;
2282         struct scsi_sense_hdr sshdr;
2283         struct request *req = scsi_cmd_to_rq(SCpnt);
2284         struct scsi_disk *sdkp = scsi_disk(req->q->disk);
2285         int sense_valid = 0;
2286         int sense_deferred = 0;
2287
2288         switch (req_op(req)) {
2289         case REQ_OP_DISCARD:
2290         case REQ_OP_WRITE_ZEROES:
2291         case REQ_OP_ZONE_RESET:
2292         case REQ_OP_ZONE_RESET_ALL:
2293         case REQ_OP_ZONE_OPEN:
2294         case REQ_OP_ZONE_CLOSE:
2295         case REQ_OP_ZONE_FINISH:
2296                 if (!result) {
2297                         good_bytes = blk_rq_bytes(req);
2298                         scsi_set_resid(SCpnt, 0);
2299                 } else {
2300                         good_bytes = 0;
2301                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
2302                 }
2303                 break;
2304         default:
2305                 /*
2306                  * In case of bogus fw or device, we could end up having
2307                  * an unaligned partial completion. Check this here and force
2308                  * alignment.
2309                  */
2310                 resid = scsi_get_resid(SCpnt);
2311                 if (resid & (sector_size - 1)) {
2312                         sd_printk(KERN_INFO, sdkp,
2313                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
2314                                 resid, sector_size);
2315                         scsi_print_command(SCpnt);
2316                         resid = min(scsi_bufflen(SCpnt),
2317                                     round_up(resid, sector_size));
2318                         scsi_set_resid(SCpnt, resid);
2319                 }
2320         }
2321
2322         if (result) {
2323                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
2324                 if (sense_valid)
2325                         sense_deferred = scsi_sense_is_deferred(&sshdr);
2326         }
2327         sdkp->medium_access_timed_out = 0;
2328
2329         if (!scsi_status_is_check_condition(result) &&
2330             (!sense_valid || sense_deferred))
2331                 goto out;
2332
2333         switch (sshdr.sense_key) {
2334         case HARDWARE_ERROR:
2335         case MEDIUM_ERROR:
2336                 good_bytes = sd_completed_bytes(SCpnt);
2337                 break;
2338         case RECOVERED_ERROR:
2339                 good_bytes = scsi_bufflen(SCpnt);
2340                 break;
2341         case NO_SENSE:
2342                 /* This indicates a false check condition, so ignore it.  An
2343                  * unknown amount of data was transferred so treat it as an
2344                  * error.
2345                  */
2346                 SCpnt->result = 0;
2347                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2348                 break;
2349         case ABORTED_COMMAND:
2350                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2351                         good_bytes = sd_completed_bytes(SCpnt);
2352                 break;
2353         case ILLEGAL_REQUEST:
2354                 switch (sshdr.asc) {
2355                 case 0x10:      /* DIX: Host detected corruption */
2356                         good_bytes = sd_completed_bytes(SCpnt);
2357                         break;
2358                 case 0x20:      /* INVALID COMMAND OPCODE */
2359                 case 0x24:      /* INVALID FIELD IN CDB */
2360                         switch (SCpnt->cmnd[0]) {
2361                         case UNMAP:
2362                                 sd_disable_discard(sdkp);
2363                                 break;
2364                         case WRITE_SAME_16:
2365                         case WRITE_SAME:
2366                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2367                                         sd_disable_discard(sdkp);
2368                                 } else {
2369                                         sd_disable_write_same(sdkp);
2370                                         req->rq_flags |= RQF_QUIET;
2371                                 }
2372                                 break;
2373                         }
2374                 }
2375                 break;
2376         default:
2377                 break;
2378         }
2379
2380  out:
2381         if (sdkp->device->type == TYPE_ZBC)
2382                 good_bytes = sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2383
2384         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2385                                            "sd_done: completed %d of %d bytes\n",
2386                                            good_bytes, scsi_bufflen(SCpnt)));
2387
2388         return good_bytes;
2389 }
2390
2391 /*
2392  * spinup disk - called only in sd_revalidate_disk()
2393  */
2394 static void
2395 sd_spinup_disk(struct scsi_disk *sdkp)
2396 {
2397         static const u8 cmd[10] = { TEST_UNIT_READY };
2398         unsigned long spintime_expire = 0;
2399         int spintime, sense_valid = 0;
2400         unsigned int the_result;
2401         struct scsi_sense_hdr sshdr;
2402         struct scsi_failure failure_defs[] = {
2403                 /* Do not retry Medium Not Present */
2404                 {
2405                         .sense = UNIT_ATTENTION,
2406                         .asc = 0x3A,
2407                         .ascq = SCMD_FAILURE_ASCQ_ANY,
2408                         .result = SAM_STAT_CHECK_CONDITION,
2409                 },
2410                 {
2411                         .sense = NOT_READY,
2412                         .asc = 0x3A,
2413                         .ascq = SCMD_FAILURE_ASCQ_ANY,
2414                         .result = SAM_STAT_CHECK_CONDITION,
2415                 },
2416                 /* Retry when scsi_status_is_good would return false 3 times */
2417                 {
2418                         .result = SCMD_FAILURE_STAT_ANY,
2419                         .allowed = 3,
2420                 },
2421                 {}
2422         };
2423         struct scsi_failures failures = {
2424                 .failure_definitions = failure_defs,
2425         };
2426         const struct scsi_exec_args exec_args = {
2427                 .sshdr = &sshdr,
2428                 .failures = &failures,
2429         };
2430
2431         spintime = 0;
2432
2433         /* Spin up drives, as required.  Only do this at boot time */
2434         /* Spinup needs to be done for module loads too. */
2435         do {
2436                 bool media_was_present = sdkp->media_present;
2437
2438                 scsi_failures_reset_retries(&failures);
2439
2440                 the_result = scsi_execute_cmd(sdkp->device, cmd, REQ_OP_DRV_IN,
2441                                               NULL, 0, SD_TIMEOUT,
2442                                               sdkp->max_retries, &exec_args);
2443
2444
2445                 if (the_result > 0) {
2446                         /*
2447                          * If the drive has indicated to us that it doesn't
2448                          * have any media in it, don't bother with any more
2449                          * polling.
2450                          */
2451                         if (media_not_present(sdkp, &sshdr)) {
2452                                 if (media_was_present)
2453                                         sd_printk(KERN_NOTICE, sdkp,
2454                                                   "Media removed, stopped polling\n");
2455                                 return;
2456                         }
2457                         sense_valid = scsi_sense_valid(&sshdr);
2458                 }
2459
2460                 if (!scsi_status_is_check_condition(the_result)) {
2461                         /* no sense, TUR either succeeded or failed
2462                          * with a status error */
2463                         if(!spintime && !scsi_status_is_good(the_result)) {
2464                                 sd_print_result(sdkp, "Test Unit Ready failed",
2465                                                 the_result);
2466                         }
2467                         break;
2468                 }
2469
2470                 /*
2471                  * The device does not want the automatic start to be issued.
2472                  */
2473                 if (sdkp->device->no_start_on_add)
2474                         break;
2475
2476                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2477                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2478                                 break;  /* manual intervention required */
2479                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2480                                 break;  /* standby */
2481                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2482                                 break;  /* unavailable */
2483                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2484                                 break;  /* sanitize in progress */
2485                         if (sshdr.asc == 4 && sshdr.ascq == 0x24)
2486                                 break;  /* depopulation in progress */
2487                         if (sshdr.asc == 4 && sshdr.ascq == 0x25)
2488                                 break;  /* depopulation restoration in progress */
2489                         /*
2490                          * Issue command to spin up drive when not ready
2491                          */
2492                         if (!spintime) {
2493                                 /* Return immediately and start spin cycle */
2494                                 const u8 start_cmd[10] = {
2495                                         [0] = START_STOP,
2496                                         [1] = 1,
2497                                         [4] = sdkp->device->start_stop_pwr_cond ?
2498                                                 0x11 : 1,
2499                                 };
2500
2501                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2502                                 scsi_execute_cmd(sdkp->device, start_cmd,
2503                                                  REQ_OP_DRV_IN, NULL, 0,
2504                                                  SD_TIMEOUT, sdkp->max_retries,
2505                                                  &exec_args);
2506                                 spintime_expire = jiffies + 100 * HZ;
2507                                 spintime = 1;
2508                         }
2509                         /* Wait 1 second for next try */
2510                         msleep(1000);
2511                         printk(KERN_CONT ".");
2512
2513                 /*
2514                  * Wait for USB flash devices with slow firmware.
2515                  * Yes, this sense key/ASC combination shouldn't
2516                  * occur here.  It's characteristic of these devices.
2517                  */
2518                 } else if (sense_valid &&
2519                                 sshdr.sense_key == UNIT_ATTENTION &&
2520                                 sshdr.asc == 0x28) {
2521                         if (!spintime) {
2522                                 spintime_expire = jiffies + 5 * HZ;
2523                                 spintime = 1;
2524                         }
2525                         /* Wait 1 second for next try */
2526                         msleep(1000);
2527                 } else {
2528                         /* we don't understand the sense code, so it's
2529                          * probably pointless to loop */
2530                         if(!spintime) {
2531                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2532                                 sd_print_sense_hdr(sdkp, &sshdr);
2533                         }
2534                         break;
2535                 }
2536                                 
2537         } while (spintime && time_before_eq(jiffies, spintime_expire));
2538
2539         if (spintime) {
2540                 if (scsi_status_is_good(the_result))
2541                         printk(KERN_CONT "ready\n");
2542                 else
2543                         printk(KERN_CONT "not responding...\n");
2544         }
2545 }
2546
2547 /*
2548  * Determine whether disk supports Data Integrity Field.
2549  */
2550 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2551 {
2552         struct scsi_device *sdp = sdkp->device;
2553         u8 type;
2554
2555         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) {
2556                 sdkp->protection_type = 0;
2557                 return 0;
2558         }
2559
2560         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2561
2562         if (type > T10_PI_TYPE3_PROTECTION) {
2563                 sd_printk(KERN_ERR, sdkp, "formatted with unsupported"  \
2564                           " protection type %u. Disabling disk!\n",
2565                           type);
2566                 sdkp->protection_type = 0;
2567                 return -ENODEV;
2568         }
2569
2570         sdkp->protection_type = type;
2571
2572         return 0;
2573 }
2574
2575 static void sd_config_protection(struct scsi_disk *sdkp,
2576                 struct queue_limits *lim)
2577 {
2578         struct scsi_device *sdp = sdkp->device;
2579
2580         if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY))
2581                 sd_dif_config_host(sdkp, lim);
2582
2583         if (!sdkp->protection_type)
2584                 return;
2585
2586         if (!scsi_host_dif_capable(sdp->host, sdkp->protection_type)) {
2587                 sd_first_printk(KERN_NOTICE, sdkp,
2588                                 "Disabling DIF Type %u protection\n",
2589                                 sdkp->protection_type);
2590                 sdkp->protection_type = 0;
2591         }
2592
2593         sd_first_printk(KERN_NOTICE, sdkp, "Enabling DIF Type %u protection\n",
2594                         sdkp->protection_type);
2595 }
2596
2597 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2598                         struct scsi_sense_hdr *sshdr, int sense_valid,
2599                         int the_result)
2600 {
2601         if (sense_valid)
2602                 sd_print_sense_hdr(sdkp, sshdr);
2603         else
2604                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2605
2606         /*
2607          * Set dirty bit for removable devices if not ready -
2608          * sometimes drives will not report this properly.
2609          */
2610         if (sdp->removable &&
2611             sense_valid && sshdr->sense_key == NOT_READY)
2612                 set_media_not_present(sdkp);
2613
2614         /*
2615          * We used to set media_present to 0 here to indicate no media
2616          * in the drive, but some drives fail read capacity even with
2617          * media present, so we can't do that.
2618          */
2619         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2620 }
2621
2622 #define RC16_LEN 32
2623 #if RC16_LEN > SD_BUF_SIZE
2624 #error RC16_LEN must not be more than SD_BUF_SIZE
2625 #endif
2626
2627 #define READ_CAPACITY_RETRIES_ON_RESET  10
2628
2629 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2630                 struct queue_limits *lim, unsigned char *buffer)
2631 {
2632         unsigned char cmd[16];
2633         struct scsi_sense_hdr sshdr;
2634         const struct scsi_exec_args exec_args = {
2635                 .sshdr = &sshdr,
2636         };
2637         int sense_valid = 0;
2638         int the_result;
2639         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2640         unsigned int alignment;
2641         unsigned long long lba;
2642         unsigned sector_size;
2643
2644         if (sdp->no_read_capacity_16)
2645                 return -EINVAL;
2646
2647         do {
2648                 memset(cmd, 0, 16);
2649                 cmd[0] = SERVICE_ACTION_IN_16;
2650                 cmd[1] = SAI_READ_CAPACITY_16;
2651                 cmd[13] = RC16_LEN;
2652                 memset(buffer, 0, RC16_LEN);
2653
2654                 the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN,
2655                                               buffer, RC16_LEN, SD_TIMEOUT,
2656                                               sdkp->max_retries, &exec_args);
2657                 if (the_result > 0) {
2658                         if (media_not_present(sdkp, &sshdr))
2659                                 return -ENODEV;
2660
2661                         sense_valid = scsi_sense_valid(&sshdr);
2662                         if (sense_valid &&
2663                             sshdr.sense_key == ILLEGAL_REQUEST &&
2664                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2665                             sshdr.ascq == 0x00)
2666                                 /* Invalid Command Operation Code or
2667                                  * Invalid Field in CDB, just retry
2668                                  * silently with RC10 */
2669                                 return -EINVAL;
2670                         if (sense_valid &&
2671                             sshdr.sense_key == UNIT_ATTENTION &&
2672                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2673                                 /* Device reset might occur several times,
2674                                  * give it one more chance */
2675                                 if (--reset_retries > 0)
2676                                         continue;
2677                 }
2678                 retries--;
2679
2680         } while (the_result && retries);
2681
2682         if (the_result) {
2683                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2684                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2685                 return -EINVAL;
2686         }
2687
2688         sector_size = get_unaligned_be32(&buffer[8]);
2689         lba = get_unaligned_be64(&buffer[0]);
2690
2691         if (sd_read_protection_type(sdkp, buffer) < 0) {
2692                 sdkp->capacity = 0;
2693                 return -ENODEV;
2694         }
2695
2696         /* Logical blocks per physical block exponent */
2697         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2698
2699         /* RC basis */
2700         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2701
2702         /* Lowest aligned logical block */
2703         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2704         lim->alignment_offset = alignment;
2705         if (alignment && sdkp->first_scan)
2706                 sd_printk(KERN_NOTICE, sdkp,
2707                           "physical block alignment offset: %u\n", alignment);
2708
2709         if (buffer[14] & 0x80) { /* LBPME */
2710                 sdkp->lbpme = 1;
2711
2712                 if (buffer[14] & 0x40) /* LBPRZ */
2713                         sdkp->lbprz = 1;
2714         }
2715
2716         sdkp->capacity = lba + 1;
2717         return sector_size;
2718 }
2719
2720 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2721                                                 unsigned char *buffer)
2722 {
2723         static const u8 cmd[10] = { READ_CAPACITY };
2724         struct scsi_sense_hdr sshdr;
2725         struct scsi_failure failure_defs[] = {
2726                 /* Do not retry Medium Not Present */
2727                 {
2728                         .sense = UNIT_ATTENTION,
2729                         .asc = 0x3A,
2730                         .result = SAM_STAT_CHECK_CONDITION,
2731                 },
2732                 {
2733                         .sense = NOT_READY,
2734                         .asc = 0x3A,
2735                         .result = SAM_STAT_CHECK_CONDITION,
2736                 },
2737                  /* Device reset might occur several times so retry a lot */
2738                 {
2739                         .sense = UNIT_ATTENTION,
2740                         .asc = 0x29,
2741                         .allowed = READ_CAPACITY_RETRIES_ON_RESET,
2742                         .result = SAM_STAT_CHECK_CONDITION,
2743                 },
2744                 /* Any other error not listed above retry 3 times */
2745                 {
2746                         .result = SCMD_FAILURE_RESULT_ANY,
2747                         .allowed = 3,
2748                 },
2749                 {}
2750         };
2751         struct scsi_failures failures = {
2752                 .failure_definitions = failure_defs,
2753         };
2754         const struct scsi_exec_args exec_args = {
2755                 .sshdr = &sshdr,
2756                 .failures = &failures,
2757         };
2758         int sense_valid = 0;
2759         int the_result;
2760         sector_t lba;
2761         unsigned sector_size;
2762
2763         memset(buffer, 0, 8);
2764
2765         the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, buffer,
2766                                       8, SD_TIMEOUT, sdkp->max_retries,
2767                                       &exec_args);
2768
2769         if (the_result > 0) {
2770                 sense_valid = scsi_sense_valid(&sshdr);
2771
2772                 if (media_not_present(sdkp, &sshdr))
2773                         return -ENODEV;
2774         }
2775
2776         if (the_result) {
2777                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2778                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2779                 return -EINVAL;
2780         }
2781
2782         sector_size = get_unaligned_be32(&buffer[4]);
2783         lba = get_unaligned_be32(&buffer[0]);
2784
2785         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2786                 /* Some buggy (usb cardreader) devices return an lba of
2787                    0xffffffff when the want to report a size of 0 (with
2788                    which they really mean no media is present) */
2789                 sdkp->capacity = 0;
2790                 sdkp->physical_block_size = sector_size;
2791                 return sector_size;
2792         }
2793
2794         sdkp->capacity = lba + 1;
2795         sdkp->physical_block_size = sector_size;
2796         return sector_size;
2797 }
2798
2799 static int sd_try_rc16_first(struct scsi_device *sdp)
2800 {
2801         if (sdp->host->max_cmd_len < 16)
2802                 return 0;
2803         if (sdp->try_rc_10_first)
2804                 return 0;
2805         if (sdp->scsi_level > SCSI_SPC_2)
2806                 return 1;
2807         if (scsi_device_protection(sdp))
2808                 return 1;
2809         return 0;
2810 }
2811
2812 /*
2813  * read disk capacity
2814  */
2815 static void
2816 sd_read_capacity(struct scsi_disk *sdkp, struct queue_limits *lim,
2817                 unsigned char *buffer)
2818 {
2819         int sector_size;
2820         struct scsi_device *sdp = sdkp->device;
2821
2822         if (sd_try_rc16_first(sdp)) {
2823                 sector_size = read_capacity_16(sdkp, sdp, lim, buffer);
2824                 if (sector_size == -EOVERFLOW)
2825                         goto got_data;
2826                 if (sector_size == -ENODEV)
2827                         return;
2828                 if (sector_size < 0)
2829                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2830                 if (sector_size < 0)
2831                         return;
2832         } else {
2833                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2834                 if (sector_size == -EOVERFLOW)
2835                         goto got_data;
2836                 if (sector_size < 0)
2837                         return;
2838                 if ((sizeof(sdkp->capacity) > 4) &&
2839                     (sdkp->capacity > 0xffffffffULL)) {
2840                         int old_sector_size = sector_size;
2841                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2842                                         "Trying to use READ CAPACITY(16).\n");
2843                         sector_size = read_capacity_16(sdkp, sdp, lim, buffer);
2844                         if (sector_size < 0) {
2845                                 sd_printk(KERN_NOTICE, sdkp,
2846                                         "Using 0xffffffff as device size\n");
2847                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2848                                 sector_size = old_sector_size;
2849                                 goto got_data;
2850                         }
2851                         /* Remember that READ CAPACITY(16) succeeded */
2852                         sdp->try_rc_10_first = 0;
2853                 }
2854         }
2855
2856         /* Some devices are known to return the total number of blocks,
2857          * not the highest block number.  Some devices have versions
2858          * which do this and others which do not.  Some devices we might
2859          * suspect of doing this but we don't know for certain.
2860          *
2861          * If we know the reported capacity is wrong, decrement it.  If
2862          * we can only guess, then assume the number of blocks is even
2863          * (usually true but not always) and err on the side of lowering
2864          * the capacity.
2865          */
2866         if (sdp->fix_capacity ||
2867             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2868                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2869                                 "from its reported value: %llu\n",
2870                                 (unsigned long long) sdkp->capacity);
2871                 --sdkp->capacity;
2872         }
2873
2874 got_data:
2875         if (sector_size == 0) {
2876                 sector_size = 512;
2877                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2878                           "assuming 512.\n");
2879         }
2880
2881         if (sector_size != 512 &&
2882             sector_size != 1024 &&
2883             sector_size != 2048 &&
2884             sector_size != 4096) {
2885                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2886                           sector_size);
2887                 /*
2888                  * The user might want to re-format the drive with
2889                  * a supported sectorsize.  Once this happens, it
2890                  * would be relatively trivial to set the thing up.
2891                  * For this reason, we leave the thing in the table.
2892                  */
2893                 sdkp->capacity = 0;
2894                 /*
2895                  * set a bogus sector size so the normal read/write
2896                  * logic in the block layer will eventually refuse any
2897                  * request on this device without tripping over power
2898                  * of two sector size assumptions
2899                  */
2900                 sector_size = 512;
2901         }
2902         lim->logical_block_size = sector_size;
2903         lim->physical_block_size = sdkp->physical_block_size;
2904         sdkp->device->sector_size = sector_size;
2905
2906         if (sdkp->capacity > 0xffffffff)
2907                 sdp->use_16_for_rw = 1;
2908
2909 }
2910
2911 /*
2912  * Print disk capacity
2913  */
2914 static void
2915 sd_print_capacity(struct scsi_disk *sdkp,
2916                   sector_t old_capacity)
2917 {
2918         int sector_size = sdkp->device->sector_size;
2919         char cap_str_2[10], cap_str_10[10];
2920
2921         if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2922                 return;
2923
2924         string_get_size(sdkp->capacity, sector_size,
2925                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2926         string_get_size(sdkp->capacity, sector_size,
2927                         STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
2928
2929         sd_printk(KERN_NOTICE, sdkp,
2930                   "%llu %d-byte logical blocks: (%s/%s)\n",
2931                   (unsigned long long)sdkp->capacity,
2932                   sector_size, cap_str_10, cap_str_2);
2933
2934         if (sdkp->physical_block_size != sector_size)
2935                 sd_printk(KERN_NOTICE, sdkp,
2936                           "%u-byte physical blocks\n",
2937                           sdkp->physical_block_size);
2938 }
2939
2940 /* called with buffer of length 512 */
2941 static inline int
2942 sd_do_mode_sense(struct scsi_disk *sdkp, int dbd, int modepage,
2943                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2944                  struct scsi_sense_hdr *sshdr)
2945 {
2946         /*
2947          * If we must use MODE SENSE(10), make sure that the buffer length
2948          * is at least 8 bytes so that the mode sense header fits.
2949          */
2950         if (sdkp->device->use_10_for_ms && len < 8)
2951                 len = 8;
2952
2953         return scsi_mode_sense(sdkp->device, dbd, modepage, 0, buffer, len,
2954                                SD_TIMEOUT, sdkp->max_retries, data, sshdr);
2955 }
2956
2957 /*
2958  * read write protect setting, if possible - called only in sd_revalidate_disk()
2959  * called with buffer of length SD_BUF_SIZE
2960  */
2961 static void
2962 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2963 {
2964         int res;
2965         struct scsi_device *sdp = sdkp->device;
2966         struct scsi_mode_data data;
2967         int old_wp = sdkp->write_prot;
2968
2969         set_disk_ro(sdkp->disk, 0);
2970         if (sdp->skip_ms_page_3f) {
2971                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2972                 return;
2973         }
2974
2975         if (sdp->use_192_bytes_for_3f) {
2976                 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 192, &data, NULL);
2977         } else {
2978                 /*
2979                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2980                  * We have to start carefully: some devices hang if we ask
2981                  * for more than is available.
2982                  */
2983                 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 4, &data, NULL);
2984
2985                 /*
2986                  * Second attempt: ask for page 0 When only page 0 is
2987                  * implemented, a request for page 3F may return Sense Key
2988                  * 5: Illegal Request, Sense Code 24: Invalid field in
2989                  * CDB.
2990                  */
2991                 if (res < 0)
2992                         res = sd_do_mode_sense(sdkp, 0, 0, buffer, 4, &data, NULL);
2993
2994                 /*
2995                  * Third attempt: ask 255 bytes, as we did earlier.
2996                  */
2997                 if (res < 0)
2998                         res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 255,
2999                                                &data, NULL);
3000         }
3001
3002         if (res < 0) {
3003                 sd_first_printk(KERN_WARNING, sdkp,
3004                           "Test WP failed, assume Write Enabled\n");
3005         } else {
3006                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
3007                 set_disk_ro(sdkp->disk, sdkp->write_prot);
3008                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
3009                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
3010                                   sdkp->write_prot ? "on" : "off");
3011                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
3012                 }
3013         }
3014 }
3015
3016 /*
3017  * sd_read_cache_type - called only from sd_revalidate_disk()
3018  * called with buffer of length SD_BUF_SIZE
3019  */
3020 static void
3021 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
3022 {
3023         int len = 0, res;
3024         struct scsi_device *sdp = sdkp->device;
3025
3026         int dbd;
3027         int modepage;
3028         int first_len;
3029         struct scsi_mode_data data;
3030         struct scsi_sense_hdr sshdr;
3031         int old_wce = sdkp->WCE;
3032         int old_rcd = sdkp->RCD;
3033         int old_dpofua = sdkp->DPOFUA;
3034
3035
3036         if (sdkp->cache_override)
3037                 return;
3038
3039         first_len = 4;
3040         if (sdp->skip_ms_page_8) {
3041                 if (sdp->type == TYPE_RBC)
3042                         goto defaults;
3043                 else {
3044                         if (sdp->skip_ms_page_3f)
3045                                 goto defaults;
3046                         modepage = 0x3F;
3047                         if (sdp->use_192_bytes_for_3f)
3048                                 first_len = 192;
3049                         dbd = 0;
3050                 }
3051         } else if (sdp->type == TYPE_RBC) {
3052                 modepage = 6;
3053                 dbd = 8;
3054         } else {
3055                 modepage = 8;
3056                 dbd = 0;
3057         }
3058
3059         /* cautiously ask */
3060         res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, first_len,
3061                         &data, &sshdr);
3062
3063         if (res < 0)
3064                 goto bad_sense;
3065
3066         if (!data.header_length) {
3067                 modepage = 6;
3068                 first_len = 0;
3069                 sd_first_printk(KERN_ERR, sdkp,
3070                                 "Missing header in MODE_SENSE response\n");
3071         }
3072
3073         /* that went OK, now ask for the proper length */
3074         len = data.length;
3075
3076         /*
3077          * We're only interested in the first three bytes, actually.
3078          * But the data cache page is defined for the first 20.
3079          */
3080         if (len < 3)
3081                 goto bad_sense;
3082         else if (len > SD_BUF_SIZE) {
3083                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
3084                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
3085                 len = SD_BUF_SIZE;
3086         }
3087         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
3088                 len = 192;
3089
3090         /* Get the data */
3091         if (len > first_len)
3092                 res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, len,
3093                                 &data, &sshdr);
3094
3095         if (!res) {
3096                 int offset = data.header_length + data.block_descriptor_length;
3097
3098                 while (offset < len) {
3099                         u8 page_code = buffer[offset] & 0x3F;
3100                         u8 spf       = buffer[offset] & 0x40;
3101
3102                         if (page_code == 8 || page_code == 6) {
3103                                 /* We're interested only in the first 3 bytes.
3104                                  */
3105                                 if (len - offset <= 2) {
3106                                         sd_first_printk(KERN_ERR, sdkp,
3107                                                 "Incomplete mode parameter "
3108                                                         "data\n");
3109                                         goto defaults;
3110                                 } else {
3111                                         modepage = page_code;
3112                                         goto Page_found;
3113                                 }
3114                         } else {
3115                                 /* Go to the next page */
3116                                 if (spf && len - offset > 3)
3117                                         offset += 4 + (buffer[offset+2] << 8) +
3118                                                 buffer[offset+3];
3119                                 else if (!spf && len - offset > 1)
3120                                         offset += 2 + buffer[offset+1];
3121                                 else {
3122                                         sd_first_printk(KERN_ERR, sdkp,
3123                                                         "Incomplete mode "
3124                                                         "parameter data\n");
3125                                         goto defaults;
3126                                 }
3127                         }
3128                 }
3129
3130                 sd_first_printk(KERN_WARNING, sdkp,
3131                                 "No Caching mode page found\n");
3132                 goto defaults;
3133
3134         Page_found:
3135                 if (modepage == 8) {
3136                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
3137                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
3138                 } else {
3139                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
3140                         sdkp->RCD = 0;
3141                 }
3142
3143                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
3144                 if (sdp->broken_fua) {
3145                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
3146                         sdkp->DPOFUA = 0;
3147                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
3148                            !sdkp->device->use_16_for_rw) {
3149                         sd_first_printk(KERN_NOTICE, sdkp,
3150                                   "Uses READ/WRITE(6), disabling FUA\n");
3151                         sdkp->DPOFUA = 0;
3152                 }
3153
3154                 /* No cache flush allowed for write protected devices */
3155                 if (sdkp->WCE && sdkp->write_prot)
3156                         sdkp->WCE = 0;
3157
3158                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
3159                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
3160                         sd_printk(KERN_NOTICE, sdkp,
3161                                   "Write cache: %s, read cache: %s, %s\n",
3162                                   sdkp->WCE ? "enabled" : "disabled",
3163                                   sdkp->RCD ? "disabled" : "enabled",
3164                                   sdkp->DPOFUA ? "supports DPO and FUA"
3165                                   : "doesn't support DPO or FUA");
3166
3167                 return;
3168         }
3169
3170 bad_sense:
3171         if (res == -EIO && scsi_sense_valid(&sshdr) &&
3172             sshdr.sense_key == ILLEGAL_REQUEST &&
3173             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
3174                 /* Invalid field in CDB */
3175                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
3176         else
3177                 sd_first_printk(KERN_ERR, sdkp,
3178                                 "Asking for cache data failed\n");
3179
3180 defaults:
3181         if (sdp->wce_default_on) {
3182                 sd_first_printk(KERN_NOTICE, sdkp,
3183                                 "Assuming drive cache: write back\n");
3184                 sdkp->WCE = 1;
3185         } else {
3186                 sd_first_printk(KERN_WARNING, sdkp,
3187                                 "Assuming drive cache: write through\n");
3188                 sdkp->WCE = 0;
3189         }
3190         sdkp->RCD = 0;
3191         sdkp->DPOFUA = 0;
3192 }
3193
3194 static bool sd_is_perm_stream(struct scsi_disk *sdkp, unsigned int stream_id)
3195 {
3196         u8 cdb[16] = { SERVICE_ACTION_IN_16, SAI_GET_STREAM_STATUS };
3197         struct {
3198                 struct scsi_stream_status_header h;
3199                 struct scsi_stream_status s;
3200         } buf;
3201         struct scsi_device *sdev = sdkp->device;
3202         struct scsi_sense_hdr sshdr;
3203         const struct scsi_exec_args exec_args = {
3204                 .sshdr = &sshdr,
3205         };
3206         int res;
3207
3208         put_unaligned_be16(stream_id, &cdb[4]);
3209         put_unaligned_be32(sizeof(buf), &cdb[10]);
3210
3211         res = scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, &buf, sizeof(buf),
3212                                SD_TIMEOUT, sdkp->max_retries, &exec_args);
3213         if (res < 0)
3214                 return false;
3215         if (scsi_status_is_check_condition(res) && scsi_sense_valid(&sshdr))
3216                 sd_print_sense_hdr(sdkp, &sshdr);
3217         if (res)
3218                 return false;
3219         if (get_unaligned_be32(&buf.h.len) < sizeof(struct scsi_stream_status))
3220                 return false;
3221         return buf.h.stream_status[0].perm;
3222 }
3223
3224 static void sd_read_io_hints(struct scsi_disk *sdkp, unsigned char *buffer)
3225 {
3226         struct scsi_device *sdp = sdkp->device;
3227         const struct scsi_io_group_descriptor *desc, *start, *end;
3228         u16 permanent_stream_count_old;
3229         struct scsi_sense_hdr sshdr;
3230         struct scsi_mode_data data;
3231         int res;
3232
3233         if (sdp->sdev_bflags & BLIST_SKIP_IO_HINTS)
3234                 return;
3235
3236         res = scsi_mode_sense(sdp, /*dbd=*/0x8, /*modepage=*/0x0a,
3237                               /*subpage=*/0x05, buffer, SD_BUF_SIZE, SD_TIMEOUT,
3238                               sdkp->max_retries, &data, &sshdr);
3239         if (res < 0)
3240                 return;
3241         start = (void *)buffer + data.header_length + 16;
3242         end = (void *)buffer + ALIGN_DOWN(data.header_length + data.length,
3243                                           sizeof(*end));
3244         /*
3245          * From "SBC-5 Constrained Streams with Data Lifetimes": Device severs
3246          * should assign the lowest numbered stream identifiers to permanent
3247          * streams.
3248          */
3249         for (desc = start; desc < end; desc++)
3250                 if (!desc->st_enble || !sd_is_perm_stream(sdkp, desc - start))
3251                         break;
3252         permanent_stream_count_old = sdkp->permanent_stream_count;
3253         sdkp->permanent_stream_count = desc - start;
3254         if (sdkp->rscs && sdkp->permanent_stream_count < 2)
3255                 sd_printk(KERN_INFO, sdkp,
3256                           "Unexpected: RSCS has been set and the permanent stream count is %u\n",
3257                           sdkp->permanent_stream_count);
3258         else if (sdkp->permanent_stream_count != permanent_stream_count_old)
3259                 sd_printk(KERN_INFO, sdkp, "permanent stream count = %d\n",
3260                           sdkp->permanent_stream_count);
3261 }
3262
3263 /*
3264  * The ATO bit indicates whether the DIF application tag is available
3265  * for use by the operating system.
3266  */
3267 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
3268 {
3269         int res, offset;
3270         struct scsi_device *sdp = sdkp->device;
3271         struct scsi_mode_data data;
3272         struct scsi_sense_hdr sshdr;
3273
3274         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
3275                 return;
3276
3277         if (sdkp->protection_type == 0)
3278                 return;
3279
3280         res = scsi_mode_sense(sdp, 1, 0x0a, 0, buffer, 36, SD_TIMEOUT,
3281                               sdkp->max_retries, &data, &sshdr);
3282
3283         if (res < 0 || !data.header_length ||
3284             data.length < 6) {
3285                 sd_first_printk(KERN_WARNING, sdkp,
3286                           "getting Control mode page failed, assume no ATO\n");
3287
3288                 if (res == -EIO && scsi_sense_valid(&sshdr))
3289                         sd_print_sense_hdr(sdkp, &sshdr);
3290
3291                 return;
3292         }
3293
3294         offset = data.header_length + data.block_descriptor_length;
3295
3296         if ((buffer[offset] & 0x3f) != 0x0a) {
3297                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
3298                 return;
3299         }
3300
3301         if ((buffer[offset + 5] & 0x80) == 0)
3302                 return;
3303
3304         sdkp->ATO = 1;
3305
3306         return;
3307 }
3308
3309 static unsigned int sd_discard_mode(struct scsi_disk *sdkp)
3310 {
3311         if (!sdkp->lbpvpd) {
3312                 /* LBP VPD page not provided */
3313                 if (sdkp->max_unmap_blocks)
3314                         return SD_LBP_UNMAP;
3315                 return SD_LBP_WS16;
3316         }
3317
3318         /* LBP VPD page tells us what to use */
3319         if (sdkp->lbpu && sdkp->max_unmap_blocks)
3320                 return SD_LBP_UNMAP;
3321         if (sdkp->lbpws)
3322                 return SD_LBP_WS16;
3323         if (sdkp->lbpws10)
3324                 return SD_LBP_WS10;
3325         return SD_LBP_DISABLE;
3326 }
3327
3328 /*
3329  * Query disk device for preferred I/O sizes.
3330  */
3331 static void sd_read_block_limits(struct scsi_disk *sdkp,
3332                 struct queue_limits *lim)
3333 {
3334         struct scsi_vpd *vpd;
3335
3336         rcu_read_lock();
3337
3338         vpd = rcu_dereference(sdkp->device->vpd_pgb0);
3339         if (!vpd || vpd->len < 16)
3340                 goto out;
3341
3342         sdkp->min_xfer_blocks = get_unaligned_be16(&vpd->data[6]);
3343         sdkp->max_xfer_blocks = get_unaligned_be32(&vpd->data[8]);
3344         sdkp->opt_xfer_blocks = get_unaligned_be32(&vpd->data[12]);
3345
3346         if (vpd->len >= 64) {
3347                 unsigned int lba_count, desc_count;
3348
3349                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&vpd->data[36]);
3350
3351                 if (!sdkp->lbpme)
3352                         goto config_atomic;
3353
3354                 lba_count = get_unaligned_be32(&vpd->data[20]);
3355                 desc_count = get_unaligned_be32(&vpd->data[24]);
3356
3357                 if (lba_count && desc_count)
3358                         sdkp->max_unmap_blocks = lba_count;
3359
3360                 sdkp->unmap_granularity = get_unaligned_be32(&vpd->data[28]);
3361
3362                 if (vpd->data[32] & 0x80)
3363                         sdkp->unmap_alignment =
3364                                 get_unaligned_be32(&vpd->data[32]) & ~(1 << 31);
3365
3366 config_atomic:
3367                 sdkp->max_atomic = get_unaligned_be32(&vpd->data[44]);
3368                 sdkp->atomic_alignment = get_unaligned_be32(&vpd->data[48]);
3369                 sdkp->atomic_granularity = get_unaligned_be32(&vpd->data[52]);
3370                 sdkp->max_atomic_with_boundary = get_unaligned_be32(&vpd->data[56]);
3371                 sdkp->max_atomic_boundary = get_unaligned_be32(&vpd->data[60]);
3372
3373                 sd_config_atomic(sdkp, lim);
3374         }
3375
3376  out:
3377         rcu_read_unlock();
3378 }
3379
3380 /* Parse the Block Limits Extension VPD page (0xb7) */
3381 static void sd_read_block_limits_ext(struct scsi_disk *sdkp)
3382 {
3383         struct scsi_vpd *vpd;
3384
3385         rcu_read_lock();
3386         vpd = rcu_dereference(sdkp->device->vpd_pgb7);
3387         if (vpd && vpd->len >= 2)
3388                 sdkp->rscs = vpd->data[5] & 1;
3389         rcu_read_unlock();
3390 }
3391
3392 /* Query block device characteristics */
3393 static void sd_read_block_characteristics(struct scsi_disk *sdkp,
3394                 struct queue_limits *lim)
3395 {
3396         struct scsi_vpd *vpd;
3397         u16 rot;
3398
3399         rcu_read_lock();
3400         vpd = rcu_dereference(sdkp->device->vpd_pgb1);
3401
3402         if (!vpd || vpd->len < 8) {
3403                 rcu_read_unlock();
3404                 return;
3405         }
3406
3407         rot = get_unaligned_be16(&vpd->data[4]);
3408         sdkp->zoned = (vpd->data[8] >> 4) & 3;
3409         rcu_read_unlock();
3410
3411         if (rot == 1)
3412                 lim->features &= ~(BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM);
3413
3414         if (!sdkp->first_scan)
3415                 return;
3416
3417         if (sdkp->device->type == TYPE_ZBC)
3418                 sd_printk(KERN_NOTICE, sdkp, "Host-managed zoned block device\n");
3419         else if (sdkp->zoned == 1)
3420                 sd_printk(KERN_NOTICE, sdkp, "Host-aware SMR disk used as regular disk\n");
3421         else if (sdkp->zoned == 2)
3422                 sd_printk(KERN_NOTICE, sdkp, "Drive-managed SMR disk\n");
3423 }
3424
3425 /**
3426  * sd_read_block_provisioning - Query provisioning VPD page
3427  * @sdkp: disk to query
3428  */
3429 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
3430 {
3431         struct scsi_vpd *vpd;
3432
3433         if (sdkp->lbpme == 0)
3434                 return;
3435
3436         rcu_read_lock();
3437         vpd = rcu_dereference(sdkp->device->vpd_pgb2);
3438
3439         if (!vpd || vpd->len < 8) {
3440                 rcu_read_unlock();
3441                 return;
3442         }
3443
3444         sdkp->lbpvpd    = 1;
3445         sdkp->lbpu      = (vpd->data[5] >> 7) & 1; /* UNMAP */
3446         sdkp->lbpws     = (vpd->data[5] >> 6) & 1; /* WRITE SAME(16) w/ UNMAP */
3447         sdkp->lbpws10   = (vpd->data[5] >> 5) & 1; /* WRITE SAME(10) w/ UNMAP */
3448         rcu_read_unlock();
3449 }
3450
3451 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3452 {
3453         struct scsi_device *sdev = sdkp->device;
3454
3455         if (sdev->host->no_write_same) {
3456                 sdev->no_write_same = 1;
3457
3458                 return;
3459         }
3460
3461         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY, 0) < 0) {
3462                 struct scsi_vpd *vpd;
3463
3464                 sdev->no_report_opcodes = 1;
3465
3466                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3467                  * CODES is unsupported and the device has an ATA
3468                  * Information VPD page (SAT).
3469                  */
3470                 rcu_read_lock();
3471                 vpd = rcu_dereference(sdev->vpd_pg89);
3472                 if (vpd)
3473                         sdev->no_write_same = 1;
3474                 rcu_read_unlock();
3475         }
3476
3477         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16, 0) == 1)
3478                 sdkp->ws16 = 1;
3479
3480         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME, 0) == 1)
3481                 sdkp->ws10 = 1;
3482 }
3483
3484 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3485 {
3486         struct scsi_device *sdev = sdkp->device;
3487
3488         if (!sdev->security_supported)
3489                 return;
3490
3491         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3492                         SECURITY_PROTOCOL_IN, 0) == 1 &&
3493             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3494                         SECURITY_PROTOCOL_OUT, 0) == 1)
3495                 sdkp->security = 1;
3496 }
3497
3498 static inline sector_t sd64_to_sectors(struct scsi_disk *sdkp, u8 *buf)
3499 {
3500         return logical_to_sectors(sdkp->device, get_unaligned_be64(buf));
3501 }
3502
3503 /**
3504  * sd_read_cpr - Query concurrent positioning ranges
3505  * @sdkp:       disk to query
3506  */
3507 static void sd_read_cpr(struct scsi_disk *sdkp)
3508 {
3509         struct blk_independent_access_ranges *iars = NULL;
3510         unsigned char *buffer = NULL;
3511         unsigned int nr_cpr = 0;
3512         int i, vpd_len, buf_len = SD_BUF_SIZE;
3513         u8 *desc;
3514
3515         /*
3516          * We need to have the capacity set first for the block layer to be
3517          * able to check the ranges.
3518          */
3519         if (sdkp->first_scan)
3520                 return;
3521
3522         if (!sdkp->capacity)
3523                 goto out;
3524
3525         /*
3526          * Concurrent Positioning Ranges VPD: there can be at most 256 ranges,
3527          * leading to a maximum page size of 64 + 256*32 bytes.
3528          */
3529         buf_len = 64 + 256*32;
3530         buffer = kmalloc(buf_len, GFP_KERNEL);
3531         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb9, buffer, buf_len))
3532                 goto out;
3533
3534         /* We must have at least a 64B header and one 32B range descriptor */
3535         vpd_len = get_unaligned_be16(&buffer[2]) + 4;
3536         if (vpd_len > buf_len || vpd_len < 64 + 32 || (vpd_len & 31)) {
3537                 sd_printk(KERN_ERR, sdkp,
3538                           "Invalid Concurrent Positioning Ranges VPD page\n");
3539                 goto out;
3540         }
3541
3542         nr_cpr = (vpd_len - 64) / 32;
3543         if (nr_cpr == 1) {
3544                 nr_cpr = 0;
3545                 goto out;
3546         }
3547
3548         iars = disk_alloc_independent_access_ranges(sdkp->disk, nr_cpr);
3549         if (!iars) {
3550                 nr_cpr = 0;
3551                 goto out;
3552         }
3553
3554         desc = &buffer[64];
3555         for (i = 0; i < nr_cpr; i++, desc += 32) {
3556                 if (desc[0] != i) {
3557                         sd_printk(KERN_ERR, sdkp,
3558                                 "Invalid Concurrent Positioning Range number\n");
3559                         nr_cpr = 0;
3560                         break;
3561                 }
3562
3563                 iars->ia_range[i].sector = sd64_to_sectors(sdkp, desc + 8);
3564                 iars->ia_range[i].nr_sectors = sd64_to_sectors(sdkp, desc + 16);
3565         }
3566
3567 out:
3568         disk_set_independent_access_ranges(sdkp->disk, iars);
3569         if (nr_cpr && sdkp->nr_actuators != nr_cpr) {
3570                 sd_printk(KERN_NOTICE, sdkp,
3571                           "%u concurrent positioning ranges\n", nr_cpr);
3572                 sdkp->nr_actuators = nr_cpr;
3573         }
3574
3575         kfree(buffer);
3576 }
3577
3578 static bool sd_validate_min_xfer_size(struct scsi_disk *sdkp)
3579 {
3580         struct scsi_device *sdp = sdkp->device;
3581         unsigned int min_xfer_bytes =
3582                 logical_to_bytes(sdp, sdkp->min_xfer_blocks);
3583
3584         if (sdkp->min_xfer_blocks == 0)
3585                 return false;
3586
3587         if (min_xfer_bytes & (sdkp->physical_block_size - 1)) {
3588                 sd_first_printk(KERN_WARNING, sdkp,
3589                                 "Preferred minimum I/O size %u bytes not a " \
3590                                 "multiple of physical block size (%u bytes)\n",
3591                                 min_xfer_bytes, sdkp->physical_block_size);
3592                 sdkp->min_xfer_blocks = 0;
3593                 return false;
3594         }
3595
3596         sd_first_printk(KERN_INFO, sdkp, "Preferred minimum I/O size %u bytes\n",
3597                         min_xfer_bytes);
3598         return true;
3599 }
3600
3601 /*
3602  * Determine the device's preferred I/O size for reads and writes
3603  * unless the reported value is unreasonably small, large, not a
3604  * multiple of the physical block size, or simply garbage.
3605  */
3606 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3607                                       unsigned int dev_max)
3608 {
3609         struct scsi_device *sdp = sdkp->device;
3610         unsigned int opt_xfer_bytes =
3611                 logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3612         unsigned int min_xfer_bytes =
3613                 logical_to_bytes(sdp, sdkp->min_xfer_blocks);
3614
3615         if (sdkp->opt_xfer_blocks == 0)
3616                 return false;
3617
3618         if (sdkp->opt_xfer_blocks > dev_max) {
3619                 sd_first_printk(KERN_WARNING, sdkp,
3620                                 "Optimal transfer size %u logical blocks " \
3621                                 "> dev_max (%u logical blocks)\n",
3622                                 sdkp->opt_xfer_blocks, dev_max);
3623                 return false;
3624         }
3625
3626         if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3627                 sd_first_printk(KERN_WARNING, sdkp,
3628                                 "Optimal transfer size %u logical blocks " \
3629                                 "> sd driver limit (%u logical blocks)\n",
3630                                 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3631                 return false;
3632         }
3633
3634         if (opt_xfer_bytes < PAGE_SIZE) {
3635                 sd_first_printk(KERN_WARNING, sdkp,
3636                                 "Optimal transfer size %u bytes < " \
3637                                 "PAGE_SIZE (%u bytes)\n",
3638                                 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3639                 return false;
3640         }
3641
3642         if (min_xfer_bytes && opt_xfer_bytes % min_xfer_bytes) {
3643                 sd_first_printk(KERN_WARNING, sdkp,
3644                                 "Optimal transfer size %u bytes not a " \
3645                                 "multiple of preferred minimum block " \
3646                                 "size (%u bytes)\n",
3647                                 opt_xfer_bytes, min_xfer_bytes);
3648                 return false;
3649         }
3650
3651         if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3652                 sd_first_printk(KERN_WARNING, sdkp,
3653                                 "Optimal transfer size %u bytes not a " \
3654                                 "multiple of physical block size (%u bytes)\n",
3655                                 opt_xfer_bytes, sdkp->physical_block_size);
3656                 return false;
3657         }
3658
3659         sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3660                         opt_xfer_bytes);
3661         return true;
3662 }
3663
3664 static void sd_read_block_zero(struct scsi_disk *sdkp)
3665 {
3666         struct scsi_device *sdev = sdkp->device;
3667         unsigned int buf_len = sdev->sector_size;
3668         u8 *buffer, cmd[16] = { };
3669
3670         buffer = kmalloc(buf_len, GFP_KERNEL);
3671         if (!buffer)
3672                 return;
3673
3674         if (sdev->use_16_for_rw) {
3675                 cmd[0] = READ_16;
3676                 put_unaligned_be64(0, &cmd[2]); /* Logical block address 0 */
3677                 put_unaligned_be32(1, &cmd[10]);/* Transfer 1 logical block */
3678         } else {
3679                 cmd[0] = READ_10;
3680                 put_unaligned_be32(0, &cmd[2]); /* Logical block address 0 */
3681                 put_unaligned_be16(1, &cmd[7]); /* Transfer 1 logical block */
3682         }
3683
3684         scsi_execute_cmd(sdkp->device, cmd, REQ_OP_DRV_IN, buffer, buf_len,
3685                          SD_TIMEOUT, sdkp->max_retries, NULL);
3686         kfree(buffer);
3687 }
3688
3689 /**
3690  *      sd_revalidate_disk - called the first time a new disk is seen,
3691  *      performs disk spin up, read_capacity, etc.
3692  *      @disk: struct gendisk we care about
3693  **/
3694 static int sd_revalidate_disk(struct gendisk *disk)
3695 {
3696         struct scsi_disk *sdkp = scsi_disk(disk);
3697         struct scsi_device *sdp = sdkp->device;
3698         sector_t old_capacity = sdkp->capacity;
3699         struct queue_limits lim;
3700         unsigned char *buffer;
3701         unsigned int dev_max;
3702         int err;
3703
3704         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3705                                       "sd_revalidate_disk\n"));
3706
3707         /*
3708          * If the device is offline, don't try and read capacity or any
3709          * of the other niceties.
3710          */
3711         if (!scsi_device_online(sdp))
3712                 goto out;
3713
3714         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3715         if (!buffer) {
3716                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3717                           "allocation failure.\n");
3718                 goto out;
3719         }
3720
3721         sd_spinup_disk(sdkp);
3722
3723         lim = queue_limits_start_update(sdkp->disk->queue);
3724
3725         /*
3726          * Without media there is no reason to ask; moreover, some devices
3727          * react badly if we do.
3728          */
3729         if (sdkp->media_present) {
3730                 sd_read_capacity(sdkp, &lim, buffer);
3731                 /*
3732                  * Some USB/UAS devices return generic values for mode pages
3733                  * until the media has been accessed. Trigger a READ operation
3734                  * to force the device to populate mode pages.
3735                  */
3736                 if (sdp->read_before_ms)
3737                         sd_read_block_zero(sdkp);
3738                 /*
3739                  * set the default to rotational.  All non-rotational devices
3740                  * support the block characteristics VPD page, which will
3741                  * cause this to be updated correctly and any device which
3742                  * doesn't support it should be treated as rotational.
3743                  */
3744                 lim.features |= (BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM);
3745
3746                 if (scsi_device_supports_vpd(sdp)) {
3747                         sd_read_block_provisioning(sdkp);
3748                         sd_read_block_limits(sdkp, &lim);
3749                         sd_read_block_limits_ext(sdkp);
3750                         sd_read_block_characteristics(sdkp, &lim);
3751                         sd_zbc_read_zones(sdkp, &lim, buffer);
3752                 }
3753
3754                 sd_config_discard(sdkp, &lim, sd_discard_mode(sdkp));
3755
3756                 sd_print_capacity(sdkp, old_capacity);
3757
3758                 sd_read_write_protect_flag(sdkp, buffer);
3759                 sd_read_cache_type(sdkp, buffer);
3760                 sd_read_io_hints(sdkp, buffer);
3761                 sd_read_app_tag_own(sdkp, buffer);
3762                 sd_read_write_same(sdkp, buffer);
3763                 sd_read_security(sdkp, buffer);
3764                 sd_config_protection(sdkp, &lim);
3765         }
3766
3767         /*
3768          * We now have all cache related info, determine how we deal
3769          * with flush requests.
3770          */
3771         sd_set_flush_flag(sdkp, &lim);
3772
3773         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3774         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3775
3776         /* Some devices report a maximum block count for READ/WRITE requests. */
3777         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3778         lim.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3779
3780         if (sd_validate_min_xfer_size(sdkp))
3781                 lim.io_min = logical_to_bytes(sdp, sdkp->min_xfer_blocks);
3782         else
3783                 lim.io_min = 0;
3784
3785         /*
3786          * Limit default to SCSI host optimal sector limit if set. There may be
3787          * an impact on performance for when the size of a request exceeds this
3788          * host limit.
3789          */
3790         lim.io_opt = sdp->host->opt_sectors << SECTOR_SHIFT;
3791         if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3792                 lim.io_opt = min_not_zero(lim.io_opt,
3793                                 logical_to_bytes(sdp, sdkp->opt_xfer_blocks));
3794         }
3795
3796         sdkp->first_scan = 0;
3797
3798         set_capacity_and_notify(disk, logical_to_sectors(sdp, sdkp->capacity));
3799         sd_config_write_same(sdkp, &lim);
3800         kfree(buffer);
3801
3802         blk_mq_freeze_queue(sdkp->disk->queue);
3803         err = queue_limits_commit_update(sdkp->disk->queue, &lim);
3804         blk_mq_unfreeze_queue(sdkp->disk->queue);
3805         if (err)
3806                 return err;
3807
3808         /*
3809          * Query concurrent positioning ranges after
3810          * queue_limits_commit_update() unlocked q->limits_lock to avoid
3811          * deadlock with q->sysfs_dir_lock and q->sysfs_lock.
3812          */
3813         if (sdkp->media_present && scsi_device_supports_vpd(sdp))
3814                 sd_read_cpr(sdkp);
3815
3816         /*
3817          * For a zoned drive, revalidating the zones can be done only once
3818          * the gendisk capacity is set. So if this fails, set back the gendisk
3819          * capacity to 0.
3820          */
3821         if (sd_zbc_revalidate_zones(sdkp))
3822                 set_capacity_and_notify(disk, 0);
3823
3824  out:
3825         return 0;
3826 }
3827
3828 /**
3829  *      sd_unlock_native_capacity - unlock native capacity
3830  *      @disk: struct gendisk to set capacity for
3831  *
3832  *      Block layer calls this function if it detects that partitions
3833  *      on @disk reach beyond the end of the device.  If the SCSI host
3834  *      implements ->unlock_native_capacity() method, it's invoked to
3835  *      give it a chance to adjust the device capacity.
3836  *
3837  *      CONTEXT:
3838  *      Defined by block layer.  Might sleep.
3839  */
3840 static void sd_unlock_native_capacity(struct gendisk *disk)
3841 {
3842         struct scsi_device *sdev = scsi_disk(disk)->device;
3843
3844         if (sdev->host->hostt->unlock_native_capacity)
3845                 sdev->host->hostt->unlock_native_capacity(sdev);
3846 }
3847
3848 /**
3849  *      sd_format_disk_name - format disk name
3850  *      @prefix: name prefix - ie. "sd" for SCSI disks
3851  *      @index: index of the disk to format name for
3852  *      @buf: output buffer
3853  *      @buflen: length of the output buffer
3854  *
3855  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3856  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3857  *      which is followed by sdaaa.
3858  *
3859  *      This is basically 26 base counting with one extra 'nil' entry
3860  *      at the beginning from the second digit on and can be
3861  *      determined using similar method as 26 base conversion with the
3862  *      index shifted -1 after each digit is computed.
3863  *
3864  *      CONTEXT:
3865  *      Don't care.
3866  *
3867  *      RETURNS:
3868  *      0 on success, -errno on failure.
3869  */
3870 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3871 {
3872         const int base = 'z' - 'a' + 1;
3873         char *begin = buf + strlen(prefix);
3874         char *end = buf + buflen;
3875         char *p;
3876         int unit;
3877
3878         p = end - 1;
3879         *p = '\0';
3880         unit = base;
3881         do {
3882                 if (p == begin)
3883                         return -EINVAL;
3884                 *--p = 'a' + (index % unit);
3885                 index = (index / unit) - 1;
3886         } while (index >= 0);
3887
3888         memmove(begin, p, end - p);
3889         memcpy(buf, prefix, strlen(prefix));
3890
3891         return 0;
3892 }
3893
3894 /**
3895  *      sd_probe - called during driver initialization and whenever a
3896  *      new scsi device is attached to the system. It is called once
3897  *      for each scsi device (not just disks) present.
3898  *      @dev: pointer to device object
3899  *
3900  *      Returns 0 if successful (or not interested in this scsi device 
3901  *      (e.g. scanner)); 1 when there is an error.
3902  *
3903  *      Note: this function is invoked from the scsi mid-level.
3904  *      This function sets up the mapping between a given 
3905  *      <host,channel,id,lun> (found in sdp) and new device name 
3906  *      (e.g. /dev/sda). More precisely it is the block device major 
3907  *      and minor number that is chosen here.
3908  *
3909  *      Assume sd_probe is not re-entrant (for time being)
3910  *      Also think about sd_probe() and sd_remove() running coincidentally.
3911  **/
3912 static int sd_probe(struct device *dev)
3913 {
3914         struct scsi_device *sdp = to_scsi_device(dev);
3915         struct scsi_disk *sdkp;
3916         struct gendisk *gd;
3917         int index;
3918         int error;
3919
3920         scsi_autopm_get_device(sdp);
3921         error = -ENODEV;
3922         if (sdp->type != TYPE_DISK &&
3923             sdp->type != TYPE_ZBC &&
3924             sdp->type != TYPE_MOD &&
3925             sdp->type != TYPE_RBC)
3926                 goto out;
3927
3928         if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) && sdp->type == TYPE_ZBC) {
3929                 sdev_printk(KERN_WARNING, sdp,
3930                             "Unsupported ZBC host-managed device.\n");
3931                 goto out;
3932         }
3933
3934         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3935                                         "sd_probe\n"));
3936
3937         error = -ENOMEM;
3938         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3939         if (!sdkp)
3940                 goto out;
3941
3942         gd = blk_mq_alloc_disk_for_queue(sdp->request_queue,
3943                                          &sd_bio_compl_lkclass);
3944         if (!gd)
3945                 goto out_free;
3946
3947         index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3948         if (index < 0) {
3949                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3950                 goto out_put;
3951         }
3952
3953         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3954         if (error) {
3955                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3956                 goto out_free_index;
3957         }
3958
3959         sdkp->device = sdp;
3960         sdkp->disk = gd;
3961         sdkp->index = index;
3962         sdkp->max_retries = SD_MAX_RETRIES;
3963         atomic_set(&sdkp->openers, 0);
3964         atomic_set(&sdkp->device->ioerr_cnt, 0);
3965
3966         if (!sdp->request_queue->rq_timeout) {
3967                 if (sdp->type != TYPE_MOD)
3968                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3969                 else
3970                         blk_queue_rq_timeout(sdp->request_queue,
3971                                              SD_MOD_TIMEOUT);
3972         }
3973
3974         device_initialize(&sdkp->disk_dev);
3975         sdkp->disk_dev.parent = get_device(dev);
3976         sdkp->disk_dev.class = &sd_disk_class;
3977         dev_set_name(&sdkp->disk_dev, "%s", dev_name(dev));
3978
3979         error = device_add(&sdkp->disk_dev);
3980         if (error) {
3981                 put_device(&sdkp->disk_dev);
3982                 goto out;
3983         }
3984
3985         dev_set_drvdata(dev, sdkp);
3986
3987         gd->major = sd_major((index & 0xf0) >> 4);
3988         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3989         gd->minors = SD_MINORS;
3990
3991         gd->fops = &sd_fops;
3992         gd->private_data = sdkp;
3993
3994         /* defaults, until the device tells us otherwise */
3995         sdp->sector_size = 512;
3996         sdkp->capacity = 0;
3997         sdkp->media_present = 1;
3998         sdkp->write_prot = 0;
3999         sdkp->cache_override = 0;
4000         sdkp->WCE = 0;
4001         sdkp->RCD = 0;
4002         sdkp->ATO = 0;
4003         sdkp->first_scan = 1;
4004         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
4005
4006         sd_revalidate_disk(gd);
4007
4008         if (sdp->removable) {
4009                 gd->flags |= GENHD_FL_REMOVABLE;
4010                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
4011                 gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
4012         }
4013
4014         blk_pm_runtime_init(sdp->request_queue, dev);
4015         if (sdp->rpm_autosuspend) {
4016                 pm_runtime_set_autosuspend_delay(dev,
4017                         sdp->host->rpm_autosuspend_delay);
4018         }
4019
4020         error = device_add_disk(dev, gd, NULL);
4021         if (error) {
4022                 device_unregister(&sdkp->disk_dev);
4023                 put_disk(gd);
4024                 goto out;
4025         }
4026
4027         if (sdkp->security) {
4028                 sdkp->opal_dev = init_opal_dev(sdkp, &sd_sec_submit);
4029                 if (sdkp->opal_dev)
4030                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
4031         }
4032
4033         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
4034                   sdp->removable ? "removable " : "");
4035         scsi_autopm_put_device(sdp);
4036
4037         return 0;
4038
4039  out_free_index:
4040         ida_free(&sd_index_ida, index);
4041  out_put:
4042         put_disk(gd);
4043  out_free:
4044         kfree(sdkp);
4045  out:
4046         scsi_autopm_put_device(sdp);
4047         return error;
4048 }
4049
4050 /**
4051  *      sd_remove - called whenever a scsi disk (previously recognized by
4052  *      sd_probe) is detached from the system. It is called (potentially
4053  *      multiple times) during sd module unload.
4054  *      @dev: pointer to device object
4055  *
4056  *      Note: this function is invoked from the scsi mid-level.
4057  *      This function potentially frees up a device name (e.g. /dev/sdc)
4058  *      that could be re-used by a subsequent sd_probe().
4059  *      This function is not called when the built-in sd driver is "exit-ed".
4060  **/
4061 static int sd_remove(struct device *dev)
4062 {
4063         struct scsi_disk *sdkp = dev_get_drvdata(dev);
4064
4065         scsi_autopm_get_device(sdkp->device);
4066
4067         device_del(&sdkp->disk_dev);
4068         del_gendisk(sdkp->disk);
4069         if (!sdkp->suspended)
4070                 sd_shutdown(dev);
4071
4072         put_disk(sdkp->disk);
4073         return 0;
4074 }
4075
4076 static void scsi_disk_release(struct device *dev)
4077 {
4078         struct scsi_disk *sdkp = to_scsi_disk(dev);
4079
4080         ida_free(&sd_index_ida, sdkp->index);
4081         put_device(&sdkp->device->sdev_gendev);
4082         free_opal_dev(sdkp->opal_dev);
4083
4084         kfree(sdkp);
4085 }
4086
4087 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
4088 {
4089         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
4090         struct scsi_sense_hdr sshdr;
4091         const struct scsi_exec_args exec_args = {
4092                 .sshdr = &sshdr,
4093                 .req_flags = BLK_MQ_REQ_PM,
4094         };
4095         struct scsi_device *sdp = sdkp->device;
4096         int res;
4097
4098         if (start)
4099                 cmd[4] |= 1;    /* START */
4100
4101         if (sdp->start_stop_pwr_cond)
4102                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
4103
4104         if (!scsi_device_online(sdp))
4105                 return -ENODEV;
4106
4107         res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, SD_TIMEOUT,
4108                                sdkp->max_retries, &exec_args);
4109         if (res) {
4110                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
4111                 if (res > 0 && scsi_sense_valid(&sshdr)) {
4112                         sd_print_sense_hdr(sdkp, &sshdr);
4113                         /* 0x3a is medium not present */
4114                         if (sshdr.asc == 0x3a)
4115                                 res = 0;
4116                 }
4117         }
4118
4119         /* SCSI error codes must not go to the generic layer */
4120         if (res)
4121                 return -EIO;
4122
4123         return 0;
4124 }
4125
4126 /*
4127  * Send a SYNCHRONIZE CACHE instruction down to the device through
4128  * the normal SCSI command structure.  Wait for the command to
4129  * complete.
4130  */
4131 static void sd_shutdown(struct device *dev)
4132 {
4133         struct scsi_disk *sdkp = dev_get_drvdata(dev);
4134
4135         if (!sdkp)
4136                 return;         /* this can happen */
4137
4138         if (pm_runtime_suspended(dev))
4139                 return;
4140
4141         if (sdkp->WCE && sdkp->media_present) {
4142                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
4143                 sd_sync_cache(sdkp);
4144         }
4145
4146         if ((system_state != SYSTEM_RESTART &&
4147              sdkp->device->manage_system_start_stop) ||
4148             (system_state == SYSTEM_POWER_OFF &&
4149              sdkp->device->manage_shutdown)) {
4150                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
4151                 sd_start_stop_device(sdkp, 0);
4152         }
4153 }
4154
4155 static inline bool sd_do_start_stop(struct scsi_device *sdev, bool runtime)
4156 {
4157         return (sdev->manage_system_start_stop && !runtime) ||
4158                 (sdev->manage_runtime_start_stop && runtime);
4159 }
4160
4161 static int sd_suspend_common(struct device *dev, bool runtime)
4162 {
4163         struct scsi_disk *sdkp = dev_get_drvdata(dev);
4164         int ret = 0;
4165
4166         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
4167                 return 0;
4168
4169         if (sdkp->WCE && sdkp->media_present) {
4170                 if (!sdkp->device->silence_suspend)
4171                         sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
4172                 ret = sd_sync_cache(sdkp);
4173                 /* ignore OFFLINE device */
4174                 if (ret == -ENODEV)
4175                         return 0;
4176
4177                 if (ret)
4178                         return ret;
4179         }
4180
4181         if (sd_do_start_stop(sdkp->device, runtime)) {
4182                 if (!sdkp->device->silence_suspend)
4183                         sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
4184                 /* an error is not worth aborting a system sleep */
4185                 ret = sd_start_stop_device(sdkp, 0);
4186                 if (!runtime)
4187                         ret = 0;
4188         }
4189
4190         if (!ret)
4191                 sdkp->suspended = true;
4192
4193         return ret;
4194 }
4195
4196 static int sd_suspend_system(struct device *dev)
4197 {
4198         if (pm_runtime_suspended(dev))
4199                 return 0;
4200
4201         return sd_suspend_common(dev, false);
4202 }
4203
4204 static int sd_suspend_runtime(struct device *dev)
4205 {
4206         return sd_suspend_common(dev, true);
4207 }
4208
4209 static int sd_resume(struct device *dev)
4210 {
4211         struct scsi_disk *sdkp = dev_get_drvdata(dev);
4212
4213         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
4214
4215         if (opal_unlock_from_suspend(sdkp->opal_dev)) {
4216                 sd_printk(KERN_NOTICE, sdkp, "OPAL unlock failed\n");
4217                 return -EIO;
4218         }
4219
4220         return 0;
4221 }
4222
4223 static int sd_resume_common(struct device *dev, bool runtime)
4224 {
4225         struct scsi_disk *sdkp = dev_get_drvdata(dev);
4226         int ret;
4227
4228         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
4229                 return 0;
4230
4231         if (!sd_do_start_stop(sdkp->device, runtime)) {
4232                 sdkp->suspended = false;
4233                 return 0;
4234         }
4235
4236         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
4237         ret = sd_start_stop_device(sdkp, 1);
4238         if (!ret) {
4239                 sd_resume(dev);
4240                 sdkp->suspended = false;
4241         }
4242
4243         return ret;
4244 }
4245
4246 static int sd_resume_system(struct device *dev)
4247 {
4248         if (pm_runtime_suspended(dev)) {
4249                 struct scsi_disk *sdkp = dev_get_drvdata(dev);
4250                 struct scsi_device *sdp = sdkp ? sdkp->device : NULL;
4251
4252                 if (sdp && sdp->force_runtime_start_on_system_start)
4253                         pm_request_resume(dev);
4254
4255                 return 0;
4256         }
4257
4258         return sd_resume_common(dev, false);
4259 }
4260
4261 static int sd_resume_runtime(struct device *dev)
4262 {
4263         struct scsi_disk *sdkp = dev_get_drvdata(dev);
4264         struct scsi_device *sdp;
4265
4266         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
4267                 return 0;
4268
4269         sdp = sdkp->device;
4270
4271         if (sdp->ignore_media_change) {
4272                 /* clear the device's sense data */
4273                 static const u8 cmd[10] = { REQUEST_SENSE };
4274                 const struct scsi_exec_args exec_args = {
4275                         .req_flags = BLK_MQ_REQ_PM,
4276                 };
4277
4278                 if (scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0,
4279                                      sdp->request_queue->rq_timeout, 1,
4280                                      &exec_args))
4281                         sd_printk(KERN_NOTICE, sdkp,
4282                                   "Failed to clear sense data\n");
4283         }
4284
4285         return sd_resume_common(dev, true);
4286 }
4287
4288 static const struct dev_pm_ops sd_pm_ops = {
4289         .suspend                = sd_suspend_system,
4290         .resume                 = sd_resume_system,
4291         .poweroff               = sd_suspend_system,
4292         .restore                = sd_resume_system,
4293         .runtime_suspend        = sd_suspend_runtime,
4294         .runtime_resume         = sd_resume_runtime,
4295 };
4296
4297 static struct scsi_driver sd_template = {
4298         .gendrv = {
4299                 .name           = "sd",
4300                 .probe          = sd_probe,
4301                 .probe_type     = PROBE_PREFER_ASYNCHRONOUS,
4302                 .remove         = sd_remove,
4303                 .shutdown       = sd_shutdown,
4304                 .pm             = &sd_pm_ops,
4305         },
4306         .rescan                 = sd_rescan,
4307         .resume                 = sd_resume,
4308         .init_command           = sd_init_command,
4309         .uninit_command         = sd_uninit_command,
4310         .done                   = sd_done,
4311         .eh_action              = sd_eh_action,
4312         .eh_reset               = sd_eh_reset,
4313 };
4314
4315 /**
4316  *      init_sd - entry point for this driver (both when built in or when
4317  *      a module).
4318  *
4319  *      Note: this function registers this driver with the scsi mid-level.
4320  **/
4321 static int __init init_sd(void)
4322 {
4323         int majors = 0, i, err;
4324
4325         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
4326
4327         for (i = 0; i < SD_MAJORS; i++) {
4328                 if (__register_blkdev(sd_major(i), "sd", sd_default_probe))
4329                         continue;
4330                 majors++;
4331         }
4332
4333         if (!majors)
4334                 return -ENODEV;
4335
4336         err = class_register(&sd_disk_class);
4337         if (err)
4338                 goto err_out;
4339
4340         sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
4341         if (!sd_page_pool) {
4342                 printk(KERN_ERR "sd: can't init discard page pool\n");
4343                 err = -ENOMEM;
4344                 goto err_out_class;
4345         }
4346
4347         err = scsi_register_driver(&sd_template.gendrv);
4348         if (err)
4349                 goto err_out_driver;
4350
4351         return 0;
4352
4353 err_out_driver:
4354         mempool_destroy(sd_page_pool);
4355 err_out_class:
4356         class_unregister(&sd_disk_class);
4357 err_out:
4358         for (i = 0; i < SD_MAJORS; i++)
4359                 unregister_blkdev(sd_major(i), "sd");
4360         return err;
4361 }
4362
4363 /**
4364  *      exit_sd - exit point for this driver (when it is a module).
4365  *
4366  *      Note: this function unregisters this driver from the scsi mid-level.
4367  **/
4368 static void __exit exit_sd(void)
4369 {
4370         int i;
4371
4372         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
4373
4374         scsi_unregister_driver(&sd_template.gendrv);
4375         mempool_destroy(sd_page_pool);
4376
4377         class_unregister(&sd_disk_class);
4378
4379         for (i = 0; i < SD_MAJORS; i++)
4380                 unregister_blkdev(sd_major(i), "sd");
4381 }
4382
4383 module_init(init_sd);
4384 module_exit(exit_sd);
4385
4386 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
4387 {
4388         scsi_print_sense_hdr(sdkp->device,
4389                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
4390 }
4391
4392 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result)
4393 {
4394         const char *hb_string = scsi_hostbyte_string(result);
4395
4396         if (hb_string)
4397                 sd_printk(KERN_INFO, sdkp,
4398                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
4399                           hb_string ? hb_string : "invalid",
4400                           "DRIVER_OK");
4401         else
4402                 sd_printk(KERN_INFO, sdkp,
4403                           "%s: Result: hostbyte=0x%02x driverbyte=%s\n",
4404                           msg, host_byte(result), "DRIVER_OK");
4405 }
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