drivers/scsi/sd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      sd.c Copyright (C) 1992 Drew Eckhardt
   4  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   5  *
   6  *      Linux scsi disk driver
   7  *              Initial versions: Drew Eckhardt
   8  *              Subsequent revisions: Eric Youngdale
   9  *      Modification history:
  10  *       - Drew Eckhardt <drew@colorado.edu> original
  11  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
  12  *         outstanding request, and other enhancements.
  13  *         Support loadable low-level scsi drivers.
  14  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
  15  *         eight major numbers.
  16  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  17  *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
  18  *         sd_init and cleanups.
  19  *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  20  *         not being read in sd_open. Fix problem where removable media
  21  *         could be ejected after sd_open.
  22  *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  23  *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
  24  *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
  25  *         Support 32k/1M disks.
  26  *
  27  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  28  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  29  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  30  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  31  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  32  *      Note: when the logging level is set by the user, it must be greater
  33  *      than the level indicated above to trigger output.
  34  */
  35
  36 #include <linux/module.h>
  37 #include <linux/fs.h>
  38 #include <linux/kernel.h>
  39 #include <linux/mm.h>
  40 #include <linux/bio.h>
  41 #include <linux/genhd.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/mutex.h>
  52 #include <linux/string_helpers.h>
  53 #include <linux/async.h>
  54 #include <linux/slab.h>
  55 #include <linux/sed-opal.h>
  56 #include <linux/pm_runtime.h>
  57 #include <linux/pr.h>
  58 #include <linux/t10-pi.h>
  59 #include <linux/uaccess.h>
  60 #include <asm/unaligned.h>
  61
  62 #include <scsi/scsi.h>
  63 #include <scsi/scsi_cmnd.h>
  64 #include <scsi/scsi_dbg.h>
  65 #include <scsi/scsi_device.h>
  66 #include <scsi/scsi_driver.h>
  67 #include <scsi/scsi_eh.h>
  68 #include <scsi/scsi_host.h>
  69 #include <scsi/scsi_ioctl.h>
  70 #include <scsi/scsicam.h>
  71
  72 #include "sd.h"
  73 #include "scsi_priv.h"
  74 #include "scsi_logging.h"
  75
  76 MODULE_AUTHOR("Eric Youngdale");
  77 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  78 MODULE_LICENSE("GPL");
  79
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  95 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  96 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  97 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  98 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  99 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
 100
 101 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
 102 #define SD_MINORS       16
 103 #else
 104 #define SD_MINORS       0
 105 #endif
 106
 107 static void sd_config_discard(struct scsi_disk *, unsigned int);
 108 static void sd_config_write_same(struct scsi_disk *);
 109 static int  sd_revalidate_disk(struct gendisk *);
 110 static void sd_unlock_native_capacity(struct gendisk *disk);
 111 static int  sd_probe(struct device *);
 112 static int  sd_remove(struct device *);
 113 static void sd_shutdown(struct device *);
 114 static int sd_suspend_system(struct device *);
 115 static int sd_suspend_runtime(struct device *);
 116 static int sd_resume(struct device *);
 117 static void sd_rescan(struct device *);
 118 static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
 119 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 120 static int sd_done(struct scsi_cmnd *);
 121 static void sd_eh_reset(struct scsi_cmnd *);
 122 static int sd_eh_action(struct scsi_cmnd *, int);
 123 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 124 static void scsi_disk_release(struct device *cdev);
 125 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 126 static void sd_print_result(const struct scsi_disk *, const char *, int);
 127
 128 static DEFINE_IDA(sd_index_ida);
 129
 130 /* This semaphore is used to mediate the 0->1 reference get in the
 131  * face of object destruction (i.e. we can't allow a get on an
 132  * object after last put) */
 133 static DEFINE_MUTEX(sd_ref_mutex);
 134
 135 static struct kmem_cache *sd_cdb_cache;
 136 static mempool_t *sd_cdb_pool;
 137 static mempool_t *sd_page_pool;
 138
 139 static const char *sd_cache_types[] = {
 140         "write through", "none", "write back",
 141         "write back, no read (daft)"
 142 };
 143
 144 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 145 {
 146         bool wc = false, fua = false;
 147
 148         if (sdkp->WCE) {
 149                 wc = true;
 150                 if (sdkp->DPOFUA)
 151                         fua = true;
 152         }
 153
 154         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 155 }
 156
 157 static ssize_t
 158 cache_type_store(struct device *dev, struct device_attribute *attr,
 159                  const char *buf, size_t count)
 160 {
 161         int ct, rcd, wce, sp;
 162         struct scsi_disk *sdkp = to_scsi_disk(dev);
 163         struct scsi_device *sdp = sdkp->device;
 164         char buffer[64];
 165         char *buffer_data;
 166         struct scsi_mode_data data;
 167         struct scsi_sense_hdr sshdr;
 168         static const char temp[] = "temporary ";
 169         int len;
 170
 171         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 172                 /* no cache control on RBC devices; theoretically they
 173                  * can do it, but there's probably so many exceptions
 174                  * it's not worth the risk */
 175                 return -EINVAL;
 176
 177         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 178                 buf += sizeof(temp) - 1;
 179                 sdkp->cache_override = 1;
 180         } else {
 181                 sdkp->cache_override = 0;
 182         }
 183
 184         ct = sysfs_match_string(sd_cache_types, buf);
 185         if (ct < 0)
 186                 return -EINVAL;
 187
 188         rcd = ct & 0x01 ? 1 : 0;
 189         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 190
 191         if (sdkp->cache_override) {
 192                 sdkp->WCE = wce;
 193                 sdkp->RCD = rcd;
 194                 sd_set_flush_flag(sdkp);
 195                 return count;
 196         }
 197
 198         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 199                             SD_MAX_RETRIES, &data, NULL))
 200                 return -EINVAL;
 201         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 202                   data.block_descriptor_length);
 203         buffer_data = buffer + data.header_length +
 204                 data.block_descriptor_length;
 205         buffer_data[2] &= ~0x05;
 206         buffer_data[2] |= wce << 2 | rcd;
 207         sp = buffer_data[0] & 0x80 ? 1 : 0;
 208         buffer_data[0] &= ~0x80;
 209
 210         /*
 211          * Ensure WP, DPOFUA, and RESERVED fields are cleared in
 212          * received mode parameter buffer before doing MODE SELECT.
 213          */
 214         data.device_specific = 0;
 215
 216         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 217                              SD_MAX_RETRIES, &data, &sshdr)) {
 218                 if (scsi_sense_valid(&sshdr))
 219                         sd_print_sense_hdr(sdkp, &sshdr);
 220                 return -EINVAL;
 221         }
 222         revalidate_disk(sdkp->disk);
 223         return count;
 224 }
 225
 226 static ssize_t
 227 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 228                        char *buf)
 229 {
 230         struct scsi_disk *sdkp = to_scsi_disk(dev);
 231         struct scsi_device *sdp = sdkp->device;
 232
 233         return sprintf(buf, "%u\n", sdp->manage_start_stop);
 234 }
 235
 236 static ssize_t
 237 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 238                         const char *buf, size_t count)
 239 {
 240         struct scsi_disk *sdkp = to_scsi_disk(dev);
 241         struct scsi_device *sdp = sdkp->device;
 242         bool v;
 243
 244         if (!capable(CAP_SYS_ADMIN))
 245                 return -EACCES;
 246
 247         if (kstrtobool(buf, &v))
 248                 return -EINVAL;
 249
 250         sdp->manage_start_stop = v;
 251
 252         return count;
 253 }
 254 static DEVICE_ATTR_RW(manage_start_stop);
 255
 256 static ssize_t
 257 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 258 {
 259         struct scsi_disk *sdkp = to_scsi_disk(dev);
 260
 261         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 262 }
 263
 264 static ssize_t
 265 allow_restart_store(struct device *dev, struct device_attribute *attr,
 266                     const char *buf, size_t count)
 267 {
 268         bool v;
 269         struct scsi_disk *sdkp = to_scsi_disk(dev);
 270         struct scsi_device *sdp = sdkp->device;
 271
 272         if (!capable(CAP_SYS_ADMIN))
 273                 return -EACCES;
 274
 275         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 276                 return -EINVAL;
 277
 278         if (kstrtobool(buf, &v))
 279                 return -EINVAL;
 280
 281         sdp->allow_restart = v;
 282
 283         return count;
 284 }
 285 static DEVICE_ATTR_RW(allow_restart);
 286
 287 static ssize_t
 288 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 289 {
 290         struct scsi_disk *sdkp = to_scsi_disk(dev);
 291         int ct = sdkp->RCD + 2*sdkp->WCE;
 292
 293         return sprintf(buf, "%s\n", sd_cache_types[ct]);
 294 }
 295 static DEVICE_ATTR_RW(cache_type);
 296
 297 static ssize_t
 298 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 299 {
 300         struct scsi_disk *sdkp = to_scsi_disk(dev);
 301
 302         return sprintf(buf, "%u\n", sdkp->DPOFUA);
 303 }
 304 static DEVICE_ATTR_RO(FUA);
 305
 306 static ssize_t
 307 protection_type_show(struct device *dev, struct device_attribute *attr,
 308                      char *buf)
 309 {
 310         struct scsi_disk *sdkp = to_scsi_disk(dev);
 311
 312         return sprintf(buf, "%u\n", sdkp->protection_type);
 313 }
 314
 315 static ssize_t
 316 protection_type_store(struct device *dev, struct device_attribute *attr,
 317                       const char *buf, size_t count)
 318 {
 319         struct scsi_disk *sdkp = to_scsi_disk(dev);
 320         unsigned int val;
 321         int err;
 322
 323         if (!capable(CAP_SYS_ADMIN))
 324                 return -EACCES;
 325
 326         err = kstrtouint(buf, 10, &val);
 327
 328         if (err)
 329                 return err;
 330
 331         if (val <= T10_PI_TYPE3_PROTECTION)
 332                 sdkp->protection_type = val;
 333
 334         return count;
 335 }
 336 static DEVICE_ATTR_RW(protection_type);
 337
 338 static ssize_t
 339 protection_mode_show(struct device *dev, struct device_attribute *attr,
 340                      char *buf)
 341 {
 342         struct scsi_disk *sdkp = to_scsi_disk(dev);
 343         struct scsi_device *sdp = sdkp->device;
 344         unsigned int dif, dix;
 345
 346         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 347         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 348
 349         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 350                 dif = 0;
 351                 dix = 1;
 352         }
 353
 354         if (!dif && !dix)
 355                 return sprintf(buf, "none\n");
 356
 357         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 358 }
 359 static DEVICE_ATTR_RO(protection_mode);
 360
 361 static ssize_t
 362 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 363 {
 364         struct scsi_disk *sdkp = to_scsi_disk(dev);
 365
 366         return sprintf(buf, "%u\n", sdkp->ATO);
 367 }
 368 static DEVICE_ATTR_RO(app_tag_own);
 369
 370 static ssize_t
 371 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 372                        char *buf)
 373 {
 374         struct scsi_disk *sdkp = to_scsi_disk(dev);
 375
 376         return sprintf(buf, "%u\n", sdkp->lbpme);
 377 }
 378 static DEVICE_ATTR_RO(thin_provisioning);
 379
 380 /* sysfs_match_string() requires dense arrays */
 381 static const char *lbp_mode[] = {
 382         [SD_LBP_FULL]           = "full",
 383         [SD_LBP_UNMAP]          = "unmap",
 384         [SD_LBP_WS16]           = "writesame_16",
 385         [SD_LBP_WS10]           = "writesame_10",
 386         [SD_LBP_ZERO]           = "writesame_zero",
 387         [SD_LBP_DISABLE]        = "disabled",
 388 };
 389
 390 static ssize_t
 391 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 392                        char *buf)
 393 {
 394         struct scsi_disk *sdkp = to_scsi_disk(dev);
 395
 396         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 397 }
 398
 399 static ssize_t
 400 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 401                         const char *buf, size_t count)
 402 {
 403         struct scsi_disk *sdkp = to_scsi_disk(dev);
 404         struct scsi_device *sdp = sdkp->device;
 405         int mode;
 406
 407         if (!capable(CAP_SYS_ADMIN))
 408                 return -EACCES;
 409
 410         if (sd_is_zoned(sdkp)) {
 411                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 412                 return count;
 413         }
 414
 415         if (sdp->type != TYPE_DISK)
 416                 return -EINVAL;
 417
 418         mode = sysfs_match_string(lbp_mode, buf);
 419         if (mode < 0)
 420                 return -EINVAL;
 421
 422         sd_config_discard(sdkp, mode);
 423
 424         return count;
 425 }
 426 static DEVICE_ATTR_RW(provisioning_mode);
 427
 428 /* sysfs_match_string() requires dense arrays */
 429 static const char *zeroing_mode[] = {
 430         [SD_ZERO_WRITE]         = "write",
 431         [SD_ZERO_WS]            = "writesame",
 432         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 433         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 434 };
 435
 436 static ssize_t
 437 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 438                   char *buf)
 439 {
 440         struct scsi_disk *sdkp = to_scsi_disk(dev);
 441
 442         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 443 }
 444
 445 static ssize_t
 446 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 447                    const char *buf, size_t count)
 448 {
 449         struct scsi_disk *sdkp = to_scsi_disk(dev);
 450         int mode;
 451
 452         if (!capable(CAP_SYS_ADMIN))
 453                 return -EACCES;
 454
 455         mode = sysfs_match_string(zeroing_mode, buf);
 456         if (mode < 0)
 457                 return -EINVAL;
 458
 459         sdkp->zeroing_mode = mode;
 460
 461         return count;
 462 }
 463 static DEVICE_ATTR_RW(zeroing_mode);
 464
 465 static ssize_t
 466 max_medium_access_timeouts_show(struct device *dev,
 467                                 struct device_attribute *attr, char *buf)
 468 {
 469         struct scsi_disk *sdkp = to_scsi_disk(dev);
 470
 471         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 472 }
 473
 474 static ssize_t
 475 max_medium_access_timeouts_store(struct device *dev,
 476                                  struct device_attribute *attr, const char *buf,
 477                                  size_t count)
 478 {
 479         struct scsi_disk *sdkp = to_scsi_disk(dev);
 480         int err;
 481
 482         if (!capable(CAP_SYS_ADMIN))
 483                 return -EACCES;
 484
 485         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 486
 487         return err ? err : count;
 488 }
 489 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 490
 491 static ssize_t
 492 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 493                            char *buf)
 494 {
 495         struct scsi_disk *sdkp = to_scsi_disk(dev);
 496
 497         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 498 }
 499
 500 static ssize_t
 501 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 502                             const char *buf, size_t count)
 503 {
 504         struct scsi_disk *sdkp = to_scsi_disk(dev);
 505         struct scsi_device *sdp = sdkp->device;
 506         unsigned long max;
 507         int err;
 508
 509         if (!capable(CAP_SYS_ADMIN))
 510                 return -EACCES;
 511
 512         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 513                 return -EINVAL;
 514
 515         err = kstrtoul(buf, 10, &max);
 516
 517         if (err)
 518                 return err;
 519
 520         if (max == 0)
 521                 sdp->no_write_same = 1;
 522         else if (max <= SD_MAX_WS16_BLOCKS) {
 523                 sdp->no_write_same = 0;
 524                 sdkp->max_ws_blocks = max;
 525         }
 526
 527         sd_config_write_same(sdkp);
 528
 529         return count;
 530 }
 531 static DEVICE_ATTR_RW(max_write_same_blocks);
 532
 533 static struct attribute *sd_disk_attrs[] = {
 534         &dev_attr_cache_type.attr,
 535         &dev_attr_FUA.attr,
 536         &dev_attr_allow_restart.attr,
 537         &dev_attr_manage_start_stop.attr,
 538         &dev_attr_protection_type.attr,
 539         &dev_attr_protection_mode.attr,
 540         &dev_attr_app_tag_own.attr,
 541         &dev_attr_thin_provisioning.attr,
 542         &dev_attr_provisioning_mode.attr,
 543         &dev_attr_zeroing_mode.attr,
 544         &dev_attr_max_write_same_blocks.attr,
 545         &dev_attr_max_medium_access_timeouts.attr,
 546         NULL,
 547 };
 548 ATTRIBUTE_GROUPS(sd_disk);
 549
 550 static struct class sd_disk_class = {
 551         .name           = "scsi_disk",
 552         .owner          = THIS_MODULE,
 553         .dev_release    = scsi_disk_release,
 554         .dev_groups     = sd_disk_groups,
 555 };
 556
 557 static const struct dev_pm_ops sd_pm_ops = {
 558         .suspend                = sd_suspend_system,
 559         .resume                 = sd_resume,
 560         .poweroff               = sd_suspend_system,
 561         .restore                = sd_resume,
 562         .runtime_suspend        = sd_suspend_runtime,
 563         .runtime_resume         = sd_resume,
 564 };
 565
 566 static struct scsi_driver sd_template = {
 567         .gendrv = {
 568                 .name           = "sd",
 569                 .owner          = THIS_MODULE,
 570                 .probe          = sd_probe,
 571                 .remove         = sd_remove,
 572                 .shutdown       = sd_shutdown,
 573                 .pm             = &sd_pm_ops,
 574         },
 575         .rescan                 = sd_rescan,
 576         .init_command           = sd_init_command,
 577         .uninit_command         = sd_uninit_command,
 578         .done                   = sd_done,
 579         .eh_action              = sd_eh_action,
 580         .eh_reset               = sd_eh_reset,
 581 };
 582
 583 /*
 584  * Dummy kobj_map->probe function.
 585  * The default ->probe function will call modprobe, which is
 586  * pointless as this module is already loaded.
 587  */
 588 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 589 {
 590         return NULL;
 591 }
 592
 593 /*
 594  * Device no to disk mapping:
 595  *
 596  *       major         disc2     disc  p1
 597  *   |............|.............|....|....| <- dev_t
 598  *    31        20 19          8 7  4 3  0
 599  *
 600  * Inside a major, we have 16k disks, however mapped non-
 601  * contiguously. The first 16 disks are for major0, the next
 602  * ones with major1, ... Disk 256 is for major0 again, disk 272
 603  * for major1, ...
 604  * As we stay compatible with our numbering scheme, we can reuse
 605  * the well-know SCSI majors 8, 65--71, 136--143.
 606  */
 607 static int sd_major(int major_idx)
 608 {
 609         switch (major_idx) {
 610         case 0:
 611                 return SCSI_DISK0_MAJOR;
 612         case 1 ... 7:
 613                 return SCSI_DISK1_MAJOR + major_idx - 1;
 614         case 8 ... 15:
 615                 return SCSI_DISK8_MAJOR + major_idx - 8;
 616         default:
 617                 BUG();
 618                 return 0;       /* shut up gcc */
 619         }
 620 }
 621
 622 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 623 {
 624         struct scsi_disk *sdkp = NULL;
 625
 626         mutex_lock(&sd_ref_mutex);
 627
 628         if (disk->private_data) {
 629                 sdkp = scsi_disk(disk);
 630                 if (scsi_device_get(sdkp->device) == 0)
 631                         get_device(&sdkp->dev);
 632                 else
 633                         sdkp = NULL;
 634         }
 635         mutex_unlock(&sd_ref_mutex);
 636         return sdkp;
 637 }
 638
 639 static void scsi_disk_put(struct scsi_disk *sdkp)
 640 {
 641         struct scsi_device *sdev = sdkp->device;
 642
 643         mutex_lock(&sd_ref_mutex);
 644         put_device(&sdkp->dev);
 645         scsi_device_put(sdev);
 646         mutex_unlock(&sd_ref_mutex);
 647 }
 648
 649 #ifdef CONFIG_BLK_SED_OPAL
 650 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
 651                 size_t len, bool send)
 652 {
 653         struct scsi_device *sdev = data;
 654         u8 cdb[12] = { 0, };
 655         int ret;
 656
 657         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
 658         cdb[1] = secp;
 659         put_unaligned_be16(spsp, &cdb[2]);
 660         put_unaligned_be32(len, &cdb[6]);
 661
 662         ret = scsi_execute_req(sdev, cdb,
 663                         send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
 664                         buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
 665         return ret <= 0 ? ret : -EIO;
 666 }
 667 #endif /* CONFIG_BLK_SED_OPAL */
 668
 669 /*
 670  * Look up the DIX operation based on whether the command is read or
 671  * write and whether dix and dif are enabled.
 672  */
 673 static unsigned int sd_prot_op(bool write, bool dix, bool dif)
 674 {
 675         /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
 676         static const unsigned int ops[] = {     /* wrt dix dif */
 677                 SCSI_PROT_NORMAL,               /*  0   0   0  */
 678                 SCSI_PROT_READ_STRIP,           /*  0   0   1  */
 679                 SCSI_PROT_READ_INSERT,          /*  0   1   0  */
 680                 SCSI_PROT_READ_PASS,            /*  0   1   1  */
 681                 SCSI_PROT_NORMAL,               /*  1   0   0  */
 682                 SCSI_PROT_WRITE_INSERT,         /*  1   0   1  */
 683                 SCSI_PROT_WRITE_STRIP,          /*  1   1   0  */
 684                 SCSI_PROT_WRITE_PASS,           /*  1   1   1  */
 685         };
 686
 687         return ops[write << 2 | dix << 1 | dif];
 688 }
 689
 690 /*
 691  * Returns a mask of the protection flags that are valid for a given DIX
 692  * operation.
 693  */
 694 static unsigned int sd_prot_flag_mask(unsigned int prot_op)
 695 {
 696         static const unsigned int flag_mask[] = {
 697                 [SCSI_PROT_NORMAL]              = 0,
 698
 699                 [SCSI_PROT_READ_STRIP]          = SCSI_PROT_TRANSFER_PI |
 700                                                   SCSI_PROT_GUARD_CHECK |
 701                                                   SCSI_PROT_REF_CHECK |
 702                                                   SCSI_PROT_REF_INCREMENT,
 703
 704                 [SCSI_PROT_READ_INSERT]         = SCSI_PROT_REF_INCREMENT |
 705                                                   SCSI_PROT_IP_CHECKSUM,
 706
 707                 [SCSI_PROT_READ_PASS]           = SCSI_PROT_TRANSFER_PI |
 708                                                   SCSI_PROT_GUARD_CHECK |
 709                                                   SCSI_PROT_REF_CHECK |
 710                                                   SCSI_PROT_REF_INCREMENT |
 711                                                   SCSI_PROT_IP_CHECKSUM,
 712
 713                 [SCSI_PROT_WRITE_INSERT]        = SCSI_PROT_TRANSFER_PI |
 714                                                   SCSI_PROT_REF_INCREMENT,
 715
 716                 [SCSI_PROT_WRITE_STRIP]         = SCSI_PROT_GUARD_CHECK |
 717                                                   SCSI_PROT_REF_CHECK |
 718                                                   SCSI_PROT_REF_INCREMENT |
 719                                                   SCSI_PROT_IP_CHECKSUM,
 720
 721                 [SCSI_PROT_WRITE_PASS]          = SCSI_PROT_TRANSFER_PI |
 722                                                   SCSI_PROT_GUARD_CHECK |
 723                                                   SCSI_PROT_REF_CHECK |
 724                                                   SCSI_PROT_REF_INCREMENT |
 725                                                   SCSI_PROT_IP_CHECKSUM,
 726         };
 727
 728         return flag_mask[prot_op];
 729 }
 730
 731 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 732                                            unsigned int dix, unsigned int dif)
 733 {
 734         struct bio *bio = scmd->request->bio;
 735         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 736         unsigned int protect = 0;
 737
 738         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 739                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 740                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 741
 742                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 743                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 744         }
 745
 746         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 747                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 748
 749                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 750                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 751         }
 752
 753         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 754                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 755
 756                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 757                         protect = 3 << 5;       /* Disable target PI checking */
 758                 else
 759                         protect = 1 << 5;       /* Enable target PI checking */
 760         }
 761
 762         scsi_set_prot_op(scmd, prot_op);
 763         scsi_set_prot_type(scmd, dif);
 764         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 765
 766         return protect;
 767 }
 768
 769 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 770 {
 771         struct request_queue *q = sdkp->disk->queue;
 772         unsigned int logical_block_size = sdkp->device->sector_size;
 773         unsigned int max_blocks = 0;
 774
 775         q->limits.discard_alignment =
 776                 sdkp->unmap_alignment * logical_block_size;
 777         q->limits.discard_granularity =
 778                 max(sdkp->physical_block_size,
 779                     sdkp->unmap_granularity * logical_block_size);
 780         sdkp->provisioning_mode = mode;
 781
 782         switch (mode) {
 783
 784         case SD_LBP_FULL:
 785         case SD_LBP_DISABLE:
 786                 blk_queue_max_discard_sectors(q, 0);
 787                 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 788                 return;
 789
 790         case SD_LBP_UNMAP:
 791                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 792                                           (u32)SD_MAX_WS16_BLOCKS);
 793                 break;
 794
 795         case SD_LBP_WS16:
 796                 if (sdkp->device->unmap_limit_for_ws)
 797                         max_blocks = sdkp->max_unmap_blocks;
 798                 else
 799                         max_blocks = sdkp->max_ws_blocks;
 800
 801                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
 802                 break;
 803
 804         case SD_LBP_WS10:
 805                 if (sdkp->device->unmap_limit_for_ws)
 806                         max_blocks = sdkp->max_unmap_blocks;
 807                 else
 808                         max_blocks = sdkp->max_ws_blocks;
 809
 810                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
 811                 break;
 812
 813         case SD_LBP_ZERO:
 814                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 815                                           (u32)SD_MAX_WS10_BLOCKS);
 816                 break;
 817         }
 818
 819         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 820         blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 821 }
 822
 823 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 824 {
 825         struct scsi_device *sdp = cmd->device;
 826         struct request *rq = cmd->request;
 827         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 828         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 829         unsigned int data_len = 24;
 830         char *buf;
 831
 832         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 833         if (!rq->special_vec.bv_page)
 834                 return BLK_STS_RESOURCE;
 835         clear_highpage(rq->special_vec.bv_page);
 836         rq->special_vec.bv_offset = 0;
 837         rq->special_vec.bv_len = data_len;
 838         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 839
 840         cmd->cmd_len = 10;
 841         cmd->cmnd[0] = UNMAP;
 842         cmd->cmnd[8] = 24;
 843
 844         buf = page_address(rq->special_vec.bv_page);
 845         put_unaligned_be16(6 + 16, &buf[0]);
 846         put_unaligned_be16(16, &buf[2]);
 847         put_unaligned_be64(lba, &buf[8]);
 848         put_unaligned_be32(nr_blocks, &buf[16]);
 849
 850         cmd->allowed = SD_MAX_RETRIES;
 851         cmd->transfersize = data_len;
 852         rq->timeout = SD_TIMEOUT;
 853
 854         return scsi_init_io(cmd);
 855 }
 856
 857 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
 858                 bool unmap)
 859 {
 860         struct scsi_device *sdp = cmd->device;
 861         struct request *rq = cmd->request;
 862         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 863         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 864         u32 data_len = sdp->sector_size;
 865
 866         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 867         if (!rq->special_vec.bv_page)
 868                 return BLK_STS_RESOURCE;
 869         clear_highpage(rq->special_vec.bv_page);
 870         rq->special_vec.bv_offset = 0;
 871         rq->special_vec.bv_len = data_len;
 872         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 873
 874         cmd->cmd_len = 16;
 875         cmd->cmnd[0] = WRITE_SAME_16;
 876         if (unmap)
 877                 cmd->cmnd[1] = 0x8; /* UNMAP */
 878         put_unaligned_be64(lba, &cmd->cmnd[2]);
 879         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
 880
 881         cmd->allowed = SD_MAX_RETRIES;
 882         cmd->transfersize = data_len;
 883         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 884
 885         return scsi_init_io(cmd);
 886 }
 887
 888 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
 889                 bool unmap)
 890 {
 891         struct scsi_device *sdp = cmd->device;
 892         struct request *rq = cmd->request;
 893         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 894         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 895         u32 data_len = sdp->sector_size;
 896
 897         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 898         if (!rq->special_vec.bv_page)
 899                 return BLK_STS_RESOURCE;
 900         clear_highpage(rq->special_vec.bv_page);
 901         rq->special_vec.bv_offset = 0;
 902         rq->special_vec.bv_len = data_len;
 903         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 904
 905         cmd->cmd_len = 10;
 906         cmd->cmnd[0] = WRITE_SAME;
 907         if (unmap)
 908                 cmd->cmnd[1] = 0x8; /* UNMAP */
 909         put_unaligned_be32(lba, &cmd->cmnd[2]);
 910         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
 911
 912         cmd->allowed = SD_MAX_RETRIES;
 913         cmd->transfersize = data_len;
 914         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 915
 916         return scsi_init_io(cmd);
 917 }
 918
 919 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 920 {
 921         struct request *rq = cmd->request;
 922         struct scsi_device *sdp = cmd->device;
 923         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 924         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 925         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 926
 927         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 928                 switch (sdkp->zeroing_mode) {
 929                 case SD_ZERO_WS16_UNMAP:
 930                         return sd_setup_write_same16_cmnd(cmd, true);
 931                 case SD_ZERO_WS10_UNMAP:
 932                         return sd_setup_write_same10_cmnd(cmd, true);
 933                 }
 934         }
 935
 936         if (sdp->no_write_same)
 937                 return BLK_STS_TARGET;
 938
 939         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
 940                 return sd_setup_write_same16_cmnd(cmd, false);
 941
 942         return sd_setup_write_same10_cmnd(cmd, false);
 943 }
 944
 945 static void sd_config_write_same(struct scsi_disk *sdkp)
 946 {
 947         struct request_queue *q = sdkp->disk->queue;
 948         unsigned int logical_block_size = sdkp->device->sector_size;
 949
 950         if (sdkp->device->no_write_same) {
 951                 sdkp->max_ws_blocks = 0;
 952                 goto out;
 953         }
 954
 955         /* Some devices can not handle block counts above 0xffff despite
 956          * supporting WRITE SAME(16). Consequently we default to 64k
 957          * blocks per I/O unless the device explicitly advertises a
 958          * bigger limit.
 959          */
 960         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 961                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 962                                                    (u32)SD_MAX_WS16_BLOCKS);
 963         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 964                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 965                                                    (u32)SD_MAX_WS10_BLOCKS);
 966         else {
 967                 sdkp->device->no_write_same = 1;
 968                 sdkp->max_ws_blocks = 0;
 969         }
 970
 971         if (sdkp->lbprz && sdkp->lbpws)
 972                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 973         else if (sdkp->lbprz && sdkp->lbpws10)
 974                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 975         else if (sdkp->max_ws_blocks)
 976                 sdkp->zeroing_mode = SD_ZERO_WS;
 977         else
 978                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 979
 980         if (sdkp->max_ws_blocks &&
 981             sdkp->physical_block_size > logical_block_size) {
 982                 /*
 983                  * Reporting a maximum number of blocks that is not aligned
 984                  * on the device physical size would cause a large write same
 985                  * request to be split into physically unaligned chunks by
 986                  * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
 987                  * even if the caller of these functions took care to align the
 988                  * large request. So make sure the maximum reported is aligned
 989                  * to the device physical block size. This is only an optional
 990                  * optimization for regular disks, but this is mandatory to
 991                  * avoid failure of large write same requests directed at
 992                  * sequential write required zones of host-managed ZBC disks.
 993                  */
 994                 sdkp->max_ws_blocks =
 995                         round_down(sdkp->max_ws_blocks,
 996                                    bytes_to_logical(sdkp->device,
 997                                                     sdkp->physical_block_size));
 998         }
 999
1000 out:
1001         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
1002                                          (logical_block_size >> 9));
1003         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
1004                                          (logical_block_size >> 9));
1005 }
1006
1007 /**
1008  * sd_setup_write_same_cmnd - write the same data to multiple blocks
1009  * @cmd: command to prepare
1010  *
1011  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
1012  * the preference indicated by the target device.
1013  **/
1014 static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
1015 {
1016         struct request *rq = cmd->request;
1017         struct scsi_device *sdp = cmd->device;
1018         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1019         struct bio *bio = rq->bio;
1020         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1021         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1022         blk_status_t ret;
1023
1024         if (sdkp->device->no_write_same)
1025                 return BLK_STS_TARGET;
1026
1027         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
1028
1029         rq->timeout = SD_WRITE_SAME_TIMEOUT;
1030
1031         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) {
1032                 cmd->cmd_len = 16;
1033                 cmd->cmnd[0] = WRITE_SAME_16;
1034                 put_unaligned_be64(lba, &cmd->cmnd[2]);
1035                 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1036         } else {
1037                 cmd->cmd_len = 10;
1038                 cmd->cmnd[0] = WRITE_SAME;
1039                 put_unaligned_be32(lba, &cmd->cmnd[2]);
1040                 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1041         }
1042
1043         cmd->transfersize = sdp->sector_size;
1044         cmd->allowed = SD_MAX_RETRIES;
1045
1046         /*
1047          * For WRITE SAME the data transferred via the DATA OUT buffer is
1048          * different from the amount of data actually written to the target.
1049          *
1050          * We set up __data_len to the amount of data transferred via the
1051          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
1052          * to transfer a single sector of data first, but then reset it to
1053          * the amount of data to be written right after so that the I/O path
1054          * knows how much to actually write.
1055          */
1056         rq->__data_len = sdp->sector_size;
1057         ret = scsi_init_io(cmd);
1058         rq->__data_len = blk_rq_bytes(rq);
1059
1060         return ret;
1061 }
1062
1063 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1064 {
1065         struct request *rq = cmd->request;
1066
1067         /* flush requests don't perform I/O, zero the S/G table */
1068         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1069
1070         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1071         cmd->cmd_len = 10;
1072         cmd->transfersize = 0;
1073         cmd->allowed = SD_MAX_RETRIES;
1074
1075         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1076         return BLK_STS_OK;
1077 }
1078
1079 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1080                                        sector_t lba, unsigned int nr_blocks,
1081                                        unsigned char flags)
1082 {
1083         cmd->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1084         if (unlikely(cmd->cmnd == NULL))
1085                 return BLK_STS_RESOURCE;
1086
1087         cmd->cmd_len = SD_EXT_CDB_SIZE;
1088         memset(cmd->cmnd, 0, cmd->cmd_len);
1089
1090         cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
1091         cmd->cmnd[7]  = 0x18; /* Additional CDB len */
1092         cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
1093         cmd->cmnd[10] = flags;
1094         put_unaligned_be64(lba, &cmd->cmnd[12]);
1095         put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
1096         put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
1097
1098         return BLK_STS_OK;
1099 }
1100
1101 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1102                                        sector_t lba, unsigned int nr_blocks,
1103                                        unsigned char flags)
1104 {
1105         cmd->cmd_len  = 16;
1106         cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
1107         cmd->cmnd[1]  = flags;
1108         cmd->cmnd[14] = 0;
1109         cmd->cmnd[15] = 0;
1110         put_unaligned_be64(lba, &cmd->cmnd[2]);
1111         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1112
1113         return BLK_STS_OK;
1114 }
1115
1116 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1117                                        sector_t lba, unsigned int nr_blocks,
1118                                        unsigned char flags)
1119 {
1120         cmd->cmd_len = 10;
1121         cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1122         cmd->cmnd[1] = flags;
1123         cmd->cmnd[6] = 0;
1124         cmd->cmnd[9] = 0;
1125         put_unaligned_be32(lba, &cmd->cmnd[2]);
1126         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1127
1128         return BLK_STS_OK;
1129 }
1130
1131 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1132                                       sector_t lba, unsigned int nr_blocks,
1133                                       unsigned char flags)
1134 {
1135         /* Avoid that 0 blocks gets translated into 256 blocks. */
1136         if (WARN_ON_ONCE(nr_blocks == 0))
1137                 return BLK_STS_IOERR;
1138
1139         if (unlikely(flags & 0x8)) {
1140                 /*
1141                  * This happens only if this drive failed 10byte rw
1142                  * command with ILLEGAL_REQUEST during operation and
1143                  * thus turned off use_10_for_rw.
1144                  */
1145                 scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1146                 return BLK_STS_IOERR;
1147         }
1148
1149         cmd->cmd_len = 6;
1150         cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1151         cmd->cmnd[1] = (lba >> 16) & 0x1f;
1152         cmd->cmnd[2] = (lba >> 8) & 0xff;
1153         cmd->cmnd[3] = lba & 0xff;
1154         cmd->cmnd[4] = nr_blocks;
1155         cmd->cmnd[5] = 0;
1156
1157         return BLK_STS_OK;
1158 }
1159
1160 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1161 {
1162         struct request *rq = cmd->request;
1163         struct scsi_device *sdp = cmd->device;
1164         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1165         sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1166         sector_t threshold;
1167         unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1168         bool dif, dix;
1169         unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1170         bool write = rq_data_dir(rq) == WRITE;
1171         unsigned char protect, fua;
1172         blk_status_t ret;
1173
1174         ret = scsi_init_io(cmd);
1175         if (ret != BLK_STS_OK)
1176                 return ret;
1177
1178         if (!scsi_device_online(sdp) || sdp->changed) {
1179                 scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1180                 return BLK_STS_IOERR;
1181         }
1182
1183         if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->rq_disk)) {
1184                 scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1185                 return BLK_STS_IOERR;
1186         }
1187
1188         if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1189                 scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1190                 return BLK_STS_IOERR;
1191         }
1192
1193         /*
1194          * Some SD card readers can't handle accesses which touch the
1195          * last one or two logical blocks. Split accesses as needed.
1196          */
1197         threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1198
1199         if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1200                 if (lba < threshold) {
1201                         /* Access up to the threshold but not beyond */
1202                         nr_blocks = threshold - lba;
1203                 } else {
1204                         /* Access only a single logical block */
1205                         nr_blocks = 1;
1206                 }
1207         }
1208
1209         fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1210         dix = scsi_prot_sg_count(cmd);
1211         dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
1212
1213         if (write && dix)
1214                 t10_pi_prepare(cmd->request, sdkp->protection_type);
1215
1216         if (dif || dix)
1217                 protect = sd_setup_protect_cmnd(cmd, dix, dif);
1218         else
1219                 protect = 0;
1220
1221         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1222                 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1223                                          protect | fua);
1224         } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1225                 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1226                                          protect | fua);
1227         } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1228                    sdp->use_10_for_rw || protect) {
1229                 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1230                                          protect | fua);
1231         } else {
1232                 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1233                                         protect | fua);
1234         }
1235
1236         if (unlikely(ret != BLK_STS_OK))
1237                 return ret;
1238
1239         /*
1240          * We shouldn't disconnect in the middle of a sector, so with a dumb
1241          * host adapter, it's safe to assume that we can at least transfer
1242          * this many bytes between each connect / disconnect.
1243          */
1244         cmd->transfersize = sdp->sector_size;
1245         cmd->underflow = nr_blocks << 9;
1246         cmd->allowed = SD_MAX_RETRIES;
1247         cmd->sdb.length = nr_blocks * sdp->sector_size;
1248
1249         SCSI_LOG_HLQUEUE(1,
1250                          scmd_printk(KERN_INFO, cmd,
1251                                      "%s: block=%llu, count=%d\n", __func__,
1252                                      (unsigned long long)blk_rq_pos(rq),
1253                                      blk_rq_sectors(rq)));
1254         SCSI_LOG_HLQUEUE(2,
1255                          scmd_printk(KERN_INFO, cmd,
1256                                      "%s %d/%u 512 byte blocks.\n",
1257                                      write ? "writing" : "reading", nr_blocks,
1258                                      blk_rq_sectors(rq)));
1259
1260         /*
1261          * This indicates that the command is ready from our end to be
1262          * queued.
1263          */
1264         return BLK_STS_OK;
1265 }
1266
1267 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1268 {
1269         struct request *rq = cmd->request;
1270
1271         switch (req_op(rq)) {
1272         case REQ_OP_DISCARD:
1273                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1274                 case SD_LBP_UNMAP:
1275                         return sd_setup_unmap_cmnd(cmd);
1276                 case SD_LBP_WS16:
1277                         return sd_setup_write_same16_cmnd(cmd, true);
1278                 case SD_LBP_WS10:
1279                         return sd_setup_write_same10_cmnd(cmd, true);
1280                 case SD_LBP_ZERO:
1281                         return sd_setup_write_same10_cmnd(cmd, false);
1282                 default:
1283                         return BLK_STS_TARGET;
1284                 }
1285         case REQ_OP_WRITE_ZEROES:
1286                 return sd_setup_write_zeroes_cmnd(cmd);
1287         case REQ_OP_WRITE_SAME:
1288                 return sd_setup_write_same_cmnd(cmd);
1289         case REQ_OP_FLUSH:
1290                 return sd_setup_flush_cmnd(cmd);
1291         case REQ_OP_READ:
1292         case REQ_OP_WRITE:
1293                 return sd_setup_read_write_cmnd(cmd);
1294         case REQ_OP_ZONE_RESET:
1295                 return sd_zbc_setup_reset_cmnd(cmd);
1296         default:
1297                 WARN_ON_ONCE(1);
1298                 return BLK_STS_NOTSUPP;
1299         }
1300 }
1301
1302 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1303 {
1304         struct request *rq = SCpnt->request;
1305         u8 *cmnd;
1306
1307         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1308                 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1309
1310         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1311                 cmnd = SCpnt->cmnd;
1312                 SCpnt->cmnd = NULL;
1313                 SCpnt->cmd_len = 0;
1314                 mempool_free(cmnd, sd_cdb_pool);
1315         }
1316 }
1317
1318 /**
1319  *      sd_open - open a scsi disk device
1320  *      @bdev: Block device of the scsi disk to open
1321  *      @mode: FMODE_* mask
1322  *
1323  *      Returns 0 if successful. Returns a negated errno value in case
1324  *      of error.
1325  *
1326  *      Note: This can be called from a user context (e.g. fsck(1) )
1327  *      or from within the kernel (e.g. as a result of a mount(1) ).
1328  *      In the latter case @inode and @filp carry an abridged amount
1329  *      of information as noted above.
1330  *
1331  *      Locking: called with bdev->bd_mutex held.
1332  **/
1333 static int sd_open(struct block_device *bdev, fmode_t mode)
1334 {
1335         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1336         struct scsi_device *sdev;
1337         int retval;
1338
1339         if (!sdkp)
1340                 return -ENXIO;
1341
1342         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1343
1344         sdev = sdkp->device;
1345
1346         /*
1347          * If the device is in error recovery, wait until it is done.
1348          * If the device is offline, then disallow any access to it.
1349          */
1350         retval = -ENXIO;
1351         if (!scsi_block_when_processing_errors(sdev))
1352                 goto error_out;
1353
1354         if (sdev->removable || sdkp->write_prot)
1355                 check_disk_change(bdev);
1356
1357         /*
1358          * If the drive is empty, just let the open fail.
1359          */
1360         retval = -ENOMEDIUM;
1361         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1362                 goto error_out;
1363
1364         /*
1365          * If the device has the write protect tab set, have the open fail
1366          * if the user expects to be able to write to the thing.
1367          */
1368         retval = -EROFS;
1369         if (sdkp->write_prot && (mode & FMODE_WRITE))
1370                 goto error_out;
1371
1372         /*
1373          * It is possible that the disk changing stuff resulted in
1374          * the device being taken offline.  If this is the case,
1375          * report this to the user, and don't pretend that the
1376          * open actually succeeded.
1377          */
1378         retval = -ENXIO;
1379         if (!scsi_device_online(sdev))
1380                 goto error_out;
1381
1382         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1383                 if (scsi_block_when_processing_errors(sdev))
1384                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1385         }
1386
1387         return 0;
1388
1389 error_out:
1390         scsi_disk_put(sdkp);
1391         return retval;
1392 }
1393
1394 /**
1395  *      sd_release - invoked when the (last) close(2) is called on this
1396  *      scsi disk.
1397  *      @disk: disk to release
1398  *      @mode: FMODE_* mask
1399  *
1400  *      Returns 0.
1401  *
1402  *      Note: may block (uninterruptible) if error recovery is underway
1403  *      on this disk.
1404  *
1405  *      Locking: called with bdev->bd_mutex held.
1406  **/
1407 static void sd_release(struct gendisk *disk, fmode_t mode)
1408 {
1409         struct scsi_disk *sdkp = scsi_disk(disk);
1410         struct scsi_device *sdev = sdkp->device;
1411
1412         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1413
1414         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1415                 if (scsi_block_when_processing_errors(sdev))
1416                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1417         }
1418
1419         scsi_disk_put(sdkp);
1420 }
1421
1422 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1423 {
1424         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1425         struct scsi_device *sdp = sdkp->device;
1426         struct Scsi_Host *host = sdp->host;
1427         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1428         int diskinfo[4];
1429
1430         /* default to most commonly used values */
1431         diskinfo[0] = 0x40;     /* 1 << 6 */
1432         diskinfo[1] = 0x20;     /* 1 << 5 */
1433         diskinfo[2] = capacity >> 11;
1434
1435         /* override with calculated, extended default, or driver values */
1436         if (host->hostt->bios_param)
1437                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1438         else
1439                 scsicam_bios_param(bdev, capacity, diskinfo);
1440
1441         geo->heads = diskinfo[0];
1442         geo->sectors = diskinfo[1];
1443         geo->cylinders = diskinfo[2];
1444         return 0;
1445 }
1446
1447 /**
1448  *      sd_ioctl - process an ioctl
1449  *      @bdev: target block device
1450  *      @mode: FMODE_* mask
1451  *      @cmd: ioctl command number
1452  *      @arg: this is third argument given to ioctl(2) system call.
1453  *      Often contains a pointer.
1454  *
1455  *      Returns 0 if successful (some ioctls return positive numbers on
1456  *      success as well). Returns a negated errno value in case of error.
1457  *
1458  *      Note: most ioctls are forward onto the block subsystem or further
1459  *      down in the scsi subsystem.
1460  **/
1461 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1462                     unsigned int cmd, unsigned long arg)
1463 {
1464         struct gendisk *disk = bdev->bd_disk;
1465         struct scsi_disk *sdkp = scsi_disk(disk);
1466         struct scsi_device *sdp = sdkp->device;
1467         void __user *p = (void __user *)arg;
1468         int error;
1469
1470         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1471                                     "cmd=0x%x\n", disk->disk_name, cmd));
1472
1473         error = scsi_verify_blk_ioctl(bdev, cmd);
1474         if (error < 0)
1475                 return error;
1476
1477         /*
1478          * If we are in the middle of error recovery, don't let anyone
1479          * else try and use this device.  Also, if error recovery fails, it
1480          * may try and take the device offline, in which case all further
1481          * access to the device is prohibited.
1482          */
1483         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1484                         (mode & FMODE_NDELAY) != 0);
1485         if (error)
1486                 goto out;
1487
1488         if (is_sed_ioctl(cmd))
1489                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1490
1491         /*
1492          * Send SCSI addressing ioctls directly to mid level, send other
1493          * ioctls to block level and then onto mid level if they can't be
1494          * resolved.
1495          */
1496         switch (cmd) {
1497                 case SCSI_IOCTL_GET_IDLUN:
1498                 case SCSI_IOCTL_GET_BUS_NUMBER:
1499                         error = scsi_ioctl(sdp, cmd, p);
1500                         break;
1501                 default:
1502                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1503                         if (error != -ENOTTY)
1504                                 break;
1505                         error = scsi_ioctl(sdp, cmd, p);
1506                         break;
1507         }
1508 out:
1509         return error;
1510 }
1511
1512 static void set_media_not_present(struct scsi_disk *sdkp)
1513 {
1514         if (sdkp->media_present)
1515                 sdkp->device->changed = 1;
1516
1517         if (sdkp->device->removable) {
1518                 sdkp->media_present = 0;
1519                 sdkp->capacity = 0;
1520         }
1521 }
1522
1523 static int media_not_present(struct scsi_disk *sdkp,
1524                              struct scsi_sense_hdr *sshdr)
1525 {
1526         if (!scsi_sense_valid(sshdr))
1527                 return 0;
1528
1529         /* not invoked for commands that could return deferred errors */
1530         switch (sshdr->sense_key) {
1531         case UNIT_ATTENTION:
1532         case NOT_READY:
1533                 /* medium not present */
1534                 if (sshdr->asc == 0x3A) {
1535                         set_media_not_present(sdkp);
1536                         return 1;
1537                 }
1538         }
1539         return 0;
1540 }
1541
1542 /**
1543  *      sd_check_events - check media events
1544  *      @disk: kernel device descriptor
1545  *      @clearing: disk events currently being cleared
1546  *
1547  *      Returns mask of DISK_EVENT_*.
1548  *
1549  *      Note: this function is invoked from the block subsystem.
1550  **/
1551 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1552 {
1553         struct scsi_disk *sdkp = scsi_disk_get(disk);
1554         struct scsi_device *sdp;
1555         int retval;
1556
1557         if (!sdkp)
1558                 return 0;
1559
1560         sdp = sdkp->device;
1561         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1562
1563         /*
1564          * If the device is offline, don't send any commands - just pretend as
1565          * if the command failed.  If the device ever comes back online, we
1566          * can deal with it then.  It is only because of unrecoverable errors
1567          * that we would ever take a device offline in the first place.
1568          */
1569         if (!scsi_device_online(sdp)) {
1570                 set_media_not_present(sdkp);
1571                 goto out;
1572         }
1573
1574         /*
1575          * Using TEST_UNIT_READY enables differentiation between drive with
1576          * no cartridge loaded - NOT READY, drive with changed cartridge -
1577          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1578          *
1579          * Drives that auto spin down. eg iomega jaz 1G, will be started
1580          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1581          * sd_revalidate() is called.
1582          */
1583         if (scsi_block_when_processing_errors(sdp)) {
1584                 struct scsi_sense_hdr sshdr = { 0, };
1585
1586                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1587                                               &sshdr);
1588
1589                 /* failed to execute TUR, assume media not present */
1590                 if (host_byte(retval)) {
1591                         set_media_not_present(sdkp);
1592                         goto out;
1593                 }
1594
1595                 if (media_not_present(sdkp, &sshdr))
1596                         goto out;
1597         }
1598
1599         /*
1600          * For removable scsi disk we have to recognise the presence
1601          * of a disk in the drive.
1602          */
1603         if (!sdkp->media_present)
1604                 sdp->changed = 1;
1605         sdkp->media_present = 1;
1606 out:
1607         /*
1608          * sdp->changed is set under the following conditions:
1609          *
1610          *      Medium present state has changed in either direction.
1611          *      Device has indicated UNIT_ATTENTION.
1612          */
1613         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1614         sdp->changed = 0;
1615         scsi_disk_put(sdkp);
1616         return retval;
1617 }
1618
1619 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1620 {
1621         int retries, res;
1622         struct scsi_device *sdp = sdkp->device;
1623         const int timeout = sdp->request_queue->rq_timeout
1624                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1625         struct scsi_sense_hdr my_sshdr;
1626
1627         if (!scsi_device_online(sdp))
1628                 return -ENODEV;
1629
1630         /* caller might not be interested in sense, but we need it */
1631         if (!sshdr)
1632                 sshdr = &my_sshdr;
1633
1634         for (retries = 3; retries > 0; --retries) {
1635                 unsigned char cmd[10] = { 0 };
1636
1637                 cmd[0] = SYNCHRONIZE_CACHE;
1638                 /*
1639                  * Leave the rest of the command zero to indicate
1640                  * flush everything.
1641                  */
1642                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1643                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1644                 if (res == 0)
1645                         break;
1646         }
1647
1648         if (res) {
1649                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1650
1651                 if (driver_byte(res) == DRIVER_SENSE)
1652                         sd_print_sense_hdr(sdkp, sshdr);
1653
1654                 /* we need to evaluate the error return  */
1655                 if (scsi_sense_valid(sshdr) &&
1656                         (sshdr->asc == 0x3a ||  /* medium not present */
1657                          sshdr->asc == 0x20))   /* invalid command */
1658                                 /* this is no error here */
1659                                 return 0;
1660
1661                 switch (host_byte(res)) {
1662                 /* ignore errors due to racing a disconnection */
1663                 case DID_BAD_TARGET:
1664                 case DID_NO_CONNECT:
1665                         return 0;
1666                 /* signal the upper layer it might try again */
1667                 case DID_BUS_BUSY:
1668                 case DID_IMM_RETRY:
1669                 case DID_REQUEUE:
1670                 case DID_SOFT_ERROR:
1671                         return -EBUSY;
1672                 default:
1673                         return -EIO;
1674                 }
1675         }
1676         return 0;
1677 }
1678
1679 static void sd_rescan(struct device *dev)
1680 {
1681         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1682
1683         revalidate_disk(sdkp->disk);
1684 }
1685
1686
1687 #ifdef CONFIG_COMPAT
1688 /*
1689  * This gets directly called from VFS. When the ioctl
1690  * is not recognized we go back to the other translation paths.
1691  */
1692 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1693                            unsigned int cmd, unsigned long arg)
1694 {
1695         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1696         int error;
1697
1698         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1699                         (mode & FMODE_NDELAY) != 0);
1700         if (error)
1701                 return error;
1702
1703         /*
1704          * Let the static ioctl translation table take care of it.
1705          */
1706         if (!sdev->host->hostt->compat_ioctl)
1707                 return -ENOIOCTLCMD;
1708         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1709 }
1710 #endif
1711
1712 static char sd_pr_type(enum pr_type type)
1713 {
1714         switch (type) {
1715         case PR_WRITE_EXCLUSIVE:
1716                 return 0x01;
1717         case PR_EXCLUSIVE_ACCESS:
1718                 return 0x03;
1719         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1720                 return 0x05;
1721         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1722                 return 0x06;
1723         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1724                 return 0x07;
1725         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1726                 return 0x08;
1727         default:
1728                 return 0;
1729         }
1730 };
1731
1732 static int sd_pr_command(struct block_device *bdev, u8 sa,
1733                 u64 key, u64 sa_key, u8 type, u8 flags)
1734 {
1735         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1736         struct scsi_sense_hdr sshdr;
1737         int result;
1738         u8 cmd[16] = { 0, };
1739         u8 data[24] = { 0, };
1740
1741         cmd[0] = PERSISTENT_RESERVE_OUT;
1742         cmd[1] = sa;
1743         cmd[2] = type;
1744         put_unaligned_be32(sizeof(data), &cmd[5]);
1745
1746         put_unaligned_be64(key, &data[0]);
1747         put_unaligned_be64(sa_key, &data[8]);
1748         data[20] = flags;
1749
1750         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1751                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1752
1753         if (driver_byte(result) == DRIVER_SENSE &&
1754             scsi_sense_valid(&sshdr)) {
1755                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1756                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1757         }
1758
1759         return result;
1760 }
1761
1762 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1763                 u32 flags)
1764 {
1765         if (flags & ~PR_FL_IGNORE_KEY)
1766                 return -EOPNOTSUPP;
1767         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1768                         old_key, new_key, 0,
1769                         (1 << 0) /* APTPL */);
1770 }
1771
1772 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1773                 u32 flags)
1774 {
1775         if (flags)
1776                 return -EOPNOTSUPP;
1777         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1778 }
1779
1780 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1781 {
1782         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1783 }
1784
1785 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1786                 enum pr_type type, bool abort)
1787 {
1788         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1789                              sd_pr_type(type), 0);
1790 }
1791
1792 static int sd_pr_clear(struct block_device *bdev, u64 key)
1793 {
1794         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1795 }
1796
1797 static const struct pr_ops sd_pr_ops = {
1798         .pr_register    = sd_pr_register,
1799         .pr_reserve     = sd_pr_reserve,
1800         .pr_release     = sd_pr_release,
1801         .pr_preempt     = sd_pr_preempt,
1802         .pr_clear       = sd_pr_clear,
1803 };
1804
1805 static const struct block_device_operations sd_fops = {
1806         .owner                  = THIS_MODULE,
1807         .open                   = sd_open,
1808         .release                = sd_release,
1809         .ioctl                  = sd_ioctl,
1810         .getgeo                 = sd_getgeo,
1811 #ifdef CONFIG_COMPAT
1812         .compat_ioctl           = sd_compat_ioctl,
1813 #endif
1814         .check_events           = sd_check_events,
1815         .revalidate_disk        = sd_revalidate_disk,
1816         .unlock_native_capacity = sd_unlock_native_capacity,
1817         .report_zones           = sd_zbc_report_zones,
1818         .pr_ops                 = &sd_pr_ops,
1819 };
1820
1821 /**
1822  *      sd_eh_reset - reset error handling callback
1823  *      @scmd:          sd-issued command that has failed
1824  *
1825  *      This function is called by the SCSI midlayer before starting
1826  *      SCSI EH. When counting medium access failures we have to be
1827  *      careful to register it only only once per device and SCSI EH run;
1828  *      there might be several timed out commands which will cause the
1829  *      'max_medium_access_timeouts' counter to trigger after the first
1830  *      SCSI EH run already and set the device to offline.
1831  *      So this function resets the internal counter before starting SCSI EH.
1832  **/
1833 static void sd_eh_reset(struct scsi_cmnd *scmd)
1834 {
1835         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1836
1837         /* New SCSI EH run, reset gate variable */
1838         sdkp->ignore_medium_access_errors = false;
1839 }
1840
1841 /**
1842  *      sd_eh_action - error handling callback
1843  *      @scmd:          sd-issued command that has failed
1844  *      @eh_disp:       The recovery disposition suggested by the midlayer
1845  *
1846  *      This function is called by the SCSI midlayer upon completion of an
1847  *      error test command (currently TEST UNIT READY). The result of sending
1848  *      the eh command is passed in eh_disp.  We're looking for devices that
1849  *      fail medium access commands but are OK with non access commands like
1850  *      test unit ready (so wrongly see the device as having a successful
1851  *      recovery)
1852  **/
1853 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1854 {
1855         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1856         struct scsi_device *sdev = scmd->device;
1857
1858         if (!scsi_device_online(sdev) ||
1859             !scsi_medium_access_command(scmd) ||
1860             host_byte(scmd->result) != DID_TIME_OUT ||
1861             eh_disp != SUCCESS)
1862                 return eh_disp;
1863
1864         /*
1865          * The device has timed out executing a medium access command.
1866          * However, the TEST UNIT READY command sent during error
1867          * handling completed successfully. Either the device is in the
1868          * process of recovering or has it suffered an internal failure
1869          * that prevents access to the storage medium.
1870          */
1871         if (!sdkp->ignore_medium_access_errors) {
1872                 sdkp->medium_access_timed_out++;
1873                 sdkp->ignore_medium_access_errors = true;
1874         }
1875
1876         /*
1877          * If the device keeps failing read/write commands but TEST UNIT
1878          * READY always completes successfully we assume that medium
1879          * access is no longer possible and take the device offline.
1880          */
1881         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1882                 scmd_printk(KERN_ERR, scmd,
1883                             "Medium access timeout failure. Offlining disk!\n");
1884                 mutex_lock(&sdev->state_mutex);
1885                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1886                 mutex_unlock(&sdev->state_mutex);
1887
1888                 return SUCCESS;
1889         }
1890
1891         return eh_disp;
1892 }
1893
1894 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1895 {
1896         struct request *req = scmd->request;
1897         struct scsi_device *sdev = scmd->device;
1898         unsigned int transferred, good_bytes;
1899         u64 start_lba, end_lba, bad_lba;
1900
1901         /*
1902          * Some commands have a payload smaller than the device logical
1903          * block size (e.g. INQUIRY on a 4K disk).
1904          */
1905         if (scsi_bufflen(scmd) <= sdev->sector_size)
1906                 return 0;
1907
1908         /* Check if we have a 'bad_lba' information */
1909         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1910                                      SCSI_SENSE_BUFFERSIZE,
1911                                      &bad_lba))
1912                 return 0;
1913
1914         /*
1915          * If the bad lba was reported incorrectly, we have no idea where
1916          * the error is.
1917          */
1918         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1919         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1920         if (bad_lba < start_lba || bad_lba >= end_lba)
1921                 return 0;
1922
1923         /*
1924          * resid is optional but mostly filled in.  When it's unused,
1925          * its value is zero, so we assume the whole buffer transferred
1926          */
1927         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1928
1929         /* This computation should always be done in terms of the
1930          * resolution of the device's medium.
1931          */
1932         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1933
1934         return min(good_bytes, transferred);
1935 }
1936
1937 /**
1938  *      sd_done - bottom half handler: called when the lower level
1939  *      driver has completed (successfully or otherwise) a scsi command.
1940  *      @SCpnt: mid-level's per command structure.
1941  *
1942  *      Note: potentially run from within an ISR. Must not block.
1943  **/
1944 static int sd_done(struct scsi_cmnd *SCpnt)
1945 {
1946         int result = SCpnt->result;
1947         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1948         unsigned int sector_size = SCpnt->device->sector_size;
1949         unsigned int resid;
1950         struct scsi_sense_hdr sshdr;
1951         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1952         struct request *req = SCpnt->request;
1953         int sense_valid = 0;
1954         int sense_deferred = 0;
1955
1956         switch (req_op(req)) {
1957         case REQ_OP_DISCARD:
1958         case REQ_OP_WRITE_ZEROES:
1959         case REQ_OP_WRITE_SAME:
1960         case REQ_OP_ZONE_RESET:
1961                 if (!result) {
1962                         good_bytes = blk_rq_bytes(req);
1963                         scsi_set_resid(SCpnt, 0);
1964                 } else {
1965                         good_bytes = 0;
1966                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1967                 }
1968                 break;
1969         default:
1970                 /*
1971                  * In case of bogus fw or device, we could end up having
1972                  * an unaligned partial completion. Check this here and force
1973                  * alignment.
1974                  */
1975                 resid = scsi_get_resid(SCpnt);
1976                 if (resid & (sector_size - 1)) {
1977                         sd_printk(KERN_INFO, sdkp,
1978                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1979                                 resid, sector_size);
1980                         resid = min(scsi_bufflen(SCpnt),
1981                                     round_up(resid, sector_size));
1982                         scsi_set_resid(SCpnt, resid);
1983                 }
1984         }
1985
1986         if (result) {
1987                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1988                 if (sense_valid)
1989                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1990         }
1991         sdkp->medium_access_timed_out = 0;
1992
1993         if (driver_byte(result) != DRIVER_SENSE &&
1994             (!sense_valid || sense_deferred))
1995                 goto out;
1996
1997         switch (sshdr.sense_key) {
1998         case HARDWARE_ERROR:
1999         case MEDIUM_ERROR:
2000                 good_bytes = sd_completed_bytes(SCpnt);
2001                 break;
2002         case RECOVERED_ERROR:
2003                 good_bytes = scsi_bufflen(SCpnt);
2004                 break;
2005         case NO_SENSE:
2006                 /* This indicates a false check condition, so ignore it.  An
2007                  * unknown amount of data was transferred so treat it as an
2008                  * error.
2009                  */
2010                 SCpnt->result = 0;
2011                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2012                 break;
2013         case ABORTED_COMMAND:
2014                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2015                         good_bytes = sd_completed_bytes(SCpnt);
2016                 break;
2017         case ILLEGAL_REQUEST:
2018                 switch (sshdr.asc) {
2019                 case 0x10:      /* DIX: Host detected corruption */
2020                         good_bytes = sd_completed_bytes(SCpnt);
2021                         break;
2022                 case 0x20:      /* INVALID COMMAND OPCODE */
2023                 case 0x24:      /* INVALID FIELD IN CDB */
2024                         switch (SCpnt->cmnd[0]) {
2025                         case UNMAP:
2026                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2027                                 break;
2028                         case WRITE_SAME_16:
2029                         case WRITE_SAME:
2030                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2031                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2032                                 } else {
2033                                         sdkp->device->no_write_same = 1;
2034                                         sd_config_write_same(sdkp);
2035                                         req->rq_flags |= RQF_QUIET;
2036                                 }
2037                                 break;
2038                         }
2039                 }
2040                 break;
2041         default:
2042                 break;
2043         }
2044
2045  out:
2046         if (sd_is_zoned(sdkp))
2047                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2048
2049         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2050                                            "sd_done: completed %d of %d bytes\n",
2051                                            good_bytes, scsi_bufflen(SCpnt)));
2052
2053         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt) &&
2054             good_bytes)
2055                 t10_pi_complete(SCpnt->request, sdkp->protection_type,
2056                                 good_bytes / scsi_prot_interval(SCpnt));
2057
2058         return good_bytes;
2059 }
2060
2061 /*
2062  * spinup disk - called only in sd_revalidate_disk()
2063  */
2064 static void
2065 sd_spinup_disk(struct scsi_disk *sdkp)
2066 {
2067         unsigned char cmd[10];
2068         unsigned long spintime_expire = 0;
2069         int retries, spintime;
2070         unsigned int the_result;
2071         struct scsi_sense_hdr sshdr;
2072         int sense_valid = 0;
2073
2074         spintime = 0;
2075
2076         /* Spin up drives, as required.  Only do this at boot time */
2077         /* Spinup needs to be done for module loads too. */
2078         do {
2079                 retries = 0;
2080
2081                 do {
2082                         cmd[0] = TEST_UNIT_READY;
2083                         memset((void *) &cmd[1], 0, 9);
2084
2085                         the_result = scsi_execute_req(sdkp->device, cmd,
2086                                                       DMA_NONE, NULL, 0,
2087                                                       &sshdr, SD_TIMEOUT,
2088                                                       SD_MAX_RETRIES, NULL);
2089
2090                         /*
2091                          * If the drive has indicated to us that it
2092                          * doesn't have any media in it, don't bother
2093                          * with any more polling.
2094                          */
2095                         if (media_not_present(sdkp, &sshdr))
2096                                 return;
2097
2098                         if (the_result)
2099                                 sense_valid = scsi_sense_valid(&sshdr);
2100                         retries++;
2101                 } while (retries < 3 &&
2102                          (!scsi_status_is_good(the_result) ||
2103                           ((driver_byte(the_result) == DRIVER_SENSE) &&
2104                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2105
2106                 if (driver_byte(the_result) != DRIVER_SENSE) {
2107                         /* no sense, TUR either succeeded or failed
2108                          * with a status error */
2109                         if(!spintime && !scsi_status_is_good(the_result)) {
2110                                 sd_print_result(sdkp, "Test Unit Ready failed",
2111                                                 the_result);
2112                         }
2113                         break;
2114                 }
2115
2116                 /*
2117                  * The device does not want the automatic start to be issued.
2118                  */
2119                 if (sdkp->device->no_start_on_add)
2120                         break;
2121
2122                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2123                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2124                                 break;  /* manual intervention required */
2125                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2126                                 break;  /* standby */
2127                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2128                                 break;  /* unavailable */
2129                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2130                                 break;  /* sanitize in progress */
2131                         /*
2132                          * Issue command to spin up drive when not ready
2133                          */
2134                         if (!spintime) {
2135                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2136                                 cmd[0] = START_STOP;
2137                                 cmd[1] = 1;     /* Return immediately */
2138                                 memset((void *) &cmd[2], 0, 8);
2139                                 cmd[4] = 1;     /* Start spin cycle */
2140                                 if (sdkp->device->start_stop_pwr_cond)
2141                                         cmd[4] |= 1 << 4;
2142                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2143                                                  NULL, 0, &sshdr,
2144                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2145                                                  NULL);
2146                                 spintime_expire = jiffies + 100 * HZ;
2147                                 spintime = 1;
2148                         }
2149                         /* Wait 1 second for next try */
2150                         msleep(1000);
2151                         printk(KERN_CONT ".");
2152
2153                 /*
2154                  * Wait for USB flash devices with slow firmware.
2155                  * Yes, this sense key/ASC combination shouldn't
2156                  * occur here.  It's characteristic of these devices.
2157                  */
2158                 } else if (sense_valid &&
2159                                 sshdr.sense_key == UNIT_ATTENTION &&
2160                                 sshdr.asc == 0x28) {
2161                         if (!spintime) {
2162                                 spintime_expire = jiffies + 5 * HZ;
2163                                 spintime = 1;
2164                         }
2165                         /* Wait 1 second for next try */
2166                         msleep(1000);
2167                 } else {
2168                         /* we don't understand the sense code, so it's
2169                          * probably pointless to loop */
2170                         if(!spintime) {
2171                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2172                                 sd_print_sense_hdr(sdkp, &sshdr);
2173                         }
2174                         break;
2175                 }
2176
2177         } while (spintime && time_before_eq(jiffies, spintime_expire));
2178
2179         if (spintime) {
2180                 if (scsi_status_is_good(the_result))
2181                         printk(KERN_CONT "ready\n");
2182                 else
2183                         printk(KERN_CONT "not responding...\n");
2184         }
2185 }
2186
2187 /*
2188  * Determine whether disk supports Data Integrity Field.
2189  */
2190 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2191 {
2192         struct scsi_device *sdp = sdkp->device;
2193         u8 type;
2194         int ret = 0;
2195
2196         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2197                 return ret;
2198
2199         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2200
2201         if (type > T10_PI_TYPE3_PROTECTION)
2202                 ret = -ENODEV;
2203         else if (scsi_host_dif_capable(sdp->host, type))
2204                 ret = 1;
2205
2206         if (sdkp->first_scan || type != sdkp->protection_type)
2207                 switch (ret) {
2208                 case -ENODEV:
2209                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2210                                   " protection type %u. Disabling disk!\n",
2211                                   type);
2212                         break;
2213                 case 1:
2214                         sd_printk(KERN_NOTICE, sdkp,
2215                                   "Enabling DIF Type %u protection\n", type);
2216                         break;
2217                 case 0:
2218                         sd_printk(KERN_NOTICE, sdkp,
2219                                   "Disabling DIF Type %u protection\n", type);
2220                         break;
2221                 }
2222
2223         sdkp->protection_type = type;
2224
2225         return ret;
2226 }
2227
2228 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2229                         struct scsi_sense_hdr *sshdr, int sense_valid,
2230                         int the_result)
2231 {
2232         if (driver_byte(the_result) == DRIVER_SENSE)
2233                 sd_print_sense_hdr(sdkp, sshdr);
2234         else
2235                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2236
2237         /*
2238          * Set dirty bit for removable devices if not ready -
2239          * sometimes drives will not report this properly.
2240          */
2241         if (sdp->removable &&
2242             sense_valid && sshdr->sense_key == NOT_READY)
2243                 set_media_not_present(sdkp);
2244
2245         /*
2246          * We used to set media_present to 0 here to indicate no media
2247          * in the drive, but some drives fail read capacity even with
2248          * media present, so we can't do that.
2249          */
2250         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2251 }
2252
2253 #define RC16_LEN 32
2254 #if RC16_LEN > SD_BUF_SIZE
2255 #error RC16_LEN must not be more than SD_BUF_SIZE
2256 #endif
2257
2258 #define READ_CAPACITY_RETRIES_ON_RESET  10
2259
2260 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2261                                                 unsigned char *buffer)
2262 {
2263         unsigned char cmd[16];
2264         struct scsi_sense_hdr sshdr;
2265         int sense_valid = 0;
2266         int the_result;
2267         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2268         unsigned int alignment;
2269         unsigned long long lba;
2270         unsigned sector_size;
2271
2272         if (sdp->no_read_capacity_16)
2273                 return -EINVAL;
2274
2275         do {
2276                 memset(cmd, 0, 16);
2277                 cmd[0] = SERVICE_ACTION_IN_16;
2278                 cmd[1] = SAI_READ_CAPACITY_16;
2279                 cmd[13] = RC16_LEN;
2280                 memset(buffer, 0, RC16_LEN);
2281
2282                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2283                                         buffer, RC16_LEN, &sshdr,
2284                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2285
2286                 if (media_not_present(sdkp, &sshdr))
2287                         return -ENODEV;
2288
2289                 if (the_result) {
2290                         sense_valid = scsi_sense_valid(&sshdr);
2291                         if (sense_valid &&
2292                             sshdr.sense_key == ILLEGAL_REQUEST &&
2293                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2294                             sshdr.ascq == 0x00)
2295                                 /* Invalid Command Operation Code or
2296                                  * Invalid Field in CDB, just retry
2297                                  * silently with RC10 */
2298                                 return -EINVAL;
2299                         if (sense_valid &&
2300                             sshdr.sense_key == UNIT_ATTENTION &&
2301                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2302                                 /* Device reset might occur several times,
2303                                  * give it one more chance */
2304                                 if (--reset_retries > 0)
2305                                         continue;
2306                 }
2307                 retries--;
2308
2309         } while (the_result && retries);
2310
2311         if (the_result) {
2312                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2313                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2314                 return -EINVAL;
2315         }
2316
2317         sector_size = get_unaligned_be32(&buffer[8]);
2318         lba = get_unaligned_be64(&buffer[0]);
2319
2320         if (sd_read_protection_type(sdkp, buffer) < 0) {
2321                 sdkp->capacity = 0;
2322                 return -ENODEV;
2323         }
2324
2325         /* Logical blocks per physical block exponent */
2326         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2327
2328         /* RC basis */
2329         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2330
2331         /* Lowest aligned logical block */
2332         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2333         blk_queue_alignment_offset(sdp->request_queue, alignment);
2334         if (alignment && sdkp->first_scan)
2335                 sd_printk(KERN_NOTICE, sdkp,
2336                           "physical block alignment offset: %u\n", alignment);
2337
2338         if (buffer[14] & 0x80) { /* LBPME */
2339                 sdkp->lbpme = 1;
2340
2341                 if (buffer[14] & 0x40) /* LBPRZ */
2342                         sdkp->lbprz = 1;
2343
2344                 sd_config_discard(sdkp, SD_LBP_WS16);
2345         }
2346
2347         sdkp->capacity = lba + 1;
2348         return sector_size;
2349 }
2350
2351 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2352                                                 unsigned char *buffer)
2353 {
2354         unsigned char cmd[16];
2355         struct scsi_sense_hdr sshdr;
2356         int sense_valid = 0;
2357         int the_result;
2358         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2359         sector_t lba;
2360         unsigned sector_size;
2361
2362         do {
2363                 cmd[0] = READ_CAPACITY;
2364                 memset(&cmd[1], 0, 9);
2365                 memset(buffer, 0, 8);
2366
2367                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2368                                         buffer, 8, &sshdr,
2369                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2370
2371                 if (media_not_present(sdkp, &sshdr))
2372                         return -ENODEV;
2373
2374                 if (the_result) {
2375                         sense_valid = scsi_sense_valid(&sshdr);
2376                         if (sense_valid &&
2377                             sshdr.sense_key == UNIT_ATTENTION &&
2378                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2379                                 /* Device reset might occur several times,
2380                                  * give it one more chance */
2381                                 if (--reset_retries > 0)
2382                                         continue;
2383                 }
2384                 retries--;
2385
2386         } while (the_result && retries);
2387
2388         if (the_result) {
2389                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2390                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2391                 return -EINVAL;
2392         }
2393
2394         sector_size = get_unaligned_be32(&buffer[4]);
2395         lba = get_unaligned_be32(&buffer[0]);
2396
2397         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2398                 /* Some buggy (usb cardreader) devices return an lba of
2399                    0xffffffff when the want to report a size of 0 (with
2400                    which they really mean no media is present) */
2401                 sdkp->capacity = 0;
2402                 sdkp->physical_block_size = sector_size;
2403                 return sector_size;
2404         }
2405
2406         sdkp->capacity = lba + 1;
2407         sdkp->physical_block_size = sector_size;
2408         return sector_size;
2409 }
2410
2411 static int sd_try_rc16_first(struct scsi_device *sdp)
2412 {
2413         if (sdp->host->max_cmd_len < 16)
2414                 return 0;
2415         if (sdp->try_rc_10_first)
2416                 return 0;
2417         if (sdp->scsi_level > SCSI_SPC_2)
2418                 return 1;
2419         if (scsi_device_protection(sdp))
2420                 return 1;
2421         return 0;
2422 }
2423
2424 /*
2425  * read disk capacity
2426  */
2427 static void
2428 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2429 {
2430         int sector_size;
2431         struct scsi_device *sdp = sdkp->device;
2432
2433         if (sd_try_rc16_first(sdp)) {
2434                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2435                 if (sector_size == -EOVERFLOW)
2436                         goto got_data;
2437                 if (sector_size == -ENODEV)
2438                         return;
2439                 if (sector_size < 0)
2440                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2441                 if (sector_size < 0)
2442                         return;
2443         } else {
2444                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2445                 if (sector_size == -EOVERFLOW)
2446                         goto got_data;
2447                 if (sector_size < 0)
2448                         return;
2449                 if ((sizeof(sdkp->capacity) > 4) &&
2450                     (sdkp->capacity > 0xffffffffULL)) {
2451                         int old_sector_size = sector_size;
2452                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2453                                         "Trying to use READ CAPACITY(16).\n");
2454                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2455                         if (sector_size < 0) {
2456                                 sd_printk(KERN_NOTICE, sdkp,
2457                                         "Using 0xffffffff as device size\n");
2458                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2459                                 sector_size = old_sector_size;
2460                                 goto got_data;
2461                         }
2462                         /* Remember that READ CAPACITY(16) succeeded */
2463                         sdp->try_rc_10_first = 0;
2464                 }
2465         }
2466
2467         /* Some devices are known to return the total number of blocks,
2468          * not the highest block number.  Some devices have versions
2469          * which do this and others which do not.  Some devices we might
2470          * suspect of doing this but we don't know for certain.
2471          *
2472          * If we know the reported capacity is wrong, decrement it.  If
2473          * we can only guess, then assume the number of blocks is even
2474          * (usually true but not always) and err on the side of lowering
2475          * the capacity.
2476          */
2477         if (sdp->fix_capacity ||
2478             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2479                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2480                                 "from its reported value: %llu\n",
2481                                 (unsigned long long) sdkp->capacity);
2482                 --sdkp->capacity;
2483         }
2484
2485 got_data:
2486         if (sector_size == 0) {
2487                 sector_size = 512;
2488                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2489                           "assuming 512.\n");
2490         }
2491
2492         if (sector_size != 512 &&
2493             sector_size != 1024 &&
2494             sector_size != 2048 &&
2495             sector_size != 4096) {
2496                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2497                           sector_size);
2498                 /*
2499                  * The user might want to re-format the drive with
2500                  * a supported sectorsize.  Once this happens, it
2501                  * would be relatively trivial to set the thing up.
2502                  * For this reason, we leave the thing in the table.
2503                  */
2504                 sdkp->capacity = 0;
2505                 /*
2506                  * set a bogus sector size so the normal read/write
2507                  * logic in the block layer will eventually refuse any
2508                  * request on this device without tripping over power
2509                  * of two sector size assumptions
2510                  */
2511                 sector_size = 512;
2512         }
2513         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2514         blk_queue_physical_block_size(sdp->request_queue,
2515                                       sdkp->physical_block_size);
2516         sdkp->device->sector_size = sector_size;
2517
2518         if (sdkp->capacity > 0xffffffff)
2519                 sdp->use_16_for_rw = 1;
2520
2521 }
2522
2523 /*
2524  * Print disk capacity
2525  */
2526 static void
2527 sd_print_capacity(struct scsi_disk *sdkp,
2528                   sector_t old_capacity)
2529 {
2530         int sector_size = sdkp->device->sector_size;
2531         char cap_str_2[10], cap_str_10[10];
2532
2533         if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2534                 return;
2535
2536         string_get_size(sdkp->capacity, sector_size,
2537                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2538         string_get_size(sdkp->capacity, sector_size,
2539                         STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
2540
2541         sd_printk(KERN_NOTICE, sdkp,
2542                   "%llu %d-byte logical blocks: (%s/%s)\n",
2543                   (unsigned long long)sdkp->capacity,
2544                   sector_size, cap_str_10, cap_str_2);
2545
2546         if (sdkp->physical_block_size != sector_size)
2547                 sd_printk(KERN_NOTICE, sdkp,
2548                           "%u-byte physical blocks\n",
2549                           sdkp->physical_block_size);
2550
2551         sd_zbc_print_zones(sdkp);
2552 }
2553
2554 /* called with buffer of length 512 */
2555 static inline int
2556 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2557                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2558                  struct scsi_sense_hdr *sshdr)
2559 {
2560         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2561                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2562                                sshdr);
2563 }
2564
2565 /*
2566  * read write protect setting, if possible - called only in sd_revalidate_disk()
2567  * called with buffer of length SD_BUF_SIZE
2568  */
2569 static void
2570 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2571 {
2572         int res;
2573         struct scsi_device *sdp = sdkp->device;
2574         struct scsi_mode_data data;
2575         int disk_ro = get_disk_ro(sdkp->disk);
2576         int old_wp = sdkp->write_prot;
2577
2578         set_disk_ro(sdkp->disk, 0);
2579         if (sdp->skip_ms_page_3f) {
2580                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2581                 return;
2582         }
2583
2584         if (sdp->use_192_bytes_for_3f) {
2585                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2586         } else {
2587                 /*
2588                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2589                  * We have to start carefully: some devices hang if we ask
2590                  * for more than is available.
2591                  */
2592                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2593
2594                 /*
2595                  * Second attempt: ask for page 0 When only page 0 is
2596                  * implemented, a request for page 3F may return Sense Key
2597                  * 5: Illegal Request, Sense Code 24: Invalid field in
2598                  * CDB.
2599                  */
2600                 if (!scsi_status_is_good(res))
2601                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2602
2603                 /*
2604                  * Third attempt: ask 255 bytes, as we did earlier.
2605                  */
2606                 if (!scsi_status_is_good(res))
2607                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2608                                                &data, NULL);
2609         }
2610
2611         if (!scsi_status_is_good(res)) {
2612                 sd_first_printk(KERN_WARNING, sdkp,
2613                           "Test WP failed, assume Write Enabled\n");
2614         } else {
2615                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2616                 set_disk_ro(sdkp->disk, sdkp->write_prot || disk_ro);
2617                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2618                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2619                                   sdkp->write_prot ? "on" : "off");
2620                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2621                 }
2622         }
2623 }
2624
2625 /*
2626  * sd_read_cache_type - called only from sd_revalidate_disk()
2627  * called with buffer of length SD_BUF_SIZE
2628  */
2629 static void
2630 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2631 {
2632         int len = 0, res;
2633         struct scsi_device *sdp = sdkp->device;
2634
2635         int dbd;
2636         int modepage;
2637         int first_len;
2638         struct scsi_mode_data data;
2639         struct scsi_sense_hdr sshdr;
2640         int old_wce = sdkp->WCE;
2641         int old_rcd = sdkp->RCD;
2642         int old_dpofua = sdkp->DPOFUA;
2643
2644
2645         if (sdkp->cache_override)
2646                 return;
2647
2648         first_len = 4;
2649         if (sdp->skip_ms_page_8) {
2650                 if (sdp->type == TYPE_RBC)
2651                         goto defaults;
2652                 else {
2653                         if (sdp->skip_ms_page_3f)
2654                                 goto defaults;
2655                         modepage = 0x3F;
2656                         if (sdp->use_192_bytes_for_3f)
2657                                 first_len = 192;
2658                         dbd = 0;
2659                 }
2660         } else if (sdp->type == TYPE_RBC) {
2661                 modepage = 6;
2662                 dbd = 8;
2663         } else {
2664                 modepage = 8;
2665                 dbd = 0;
2666         }
2667
2668         /* cautiously ask */
2669         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2670                         &data, &sshdr);
2671
2672         if (!scsi_status_is_good(res))
2673                 goto bad_sense;
2674
2675         if (!data.header_length) {
2676                 modepage = 6;
2677                 first_len = 0;
2678                 sd_first_printk(KERN_ERR, sdkp,
2679                                 "Missing header in MODE_SENSE response\n");
2680         }
2681
2682         /* that went OK, now ask for the proper length */
2683         len = data.length;
2684
2685         /*
2686          * We're only interested in the first three bytes, actually.
2687          * But the data cache page is defined for the first 20.
2688          */
2689         if (len < 3)
2690                 goto bad_sense;
2691         else if (len > SD_BUF_SIZE) {
2692                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2693                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2694                 len = SD_BUF_SIZE;
2695         }
2696         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2697                 len = 192;
2698
2699         /* Get the data */
2700         if (len > first_len)
2701                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2702                                 &data, &sshdr);
2703
2704         if (scsi_status_is_good(res)) {
2705                 int offset = data.header_length + data.block_descriptor_length;
2706
2707                 while (offset < len) {
2708                         u8 page_code = buffer[offset] & 0x3F;
2709                         u8 spf       = buffer[offset] & 0x40;
2710
2711                         if (page_code == 8 || page_code == 6) {
2712                                 /* We're interested only in the first 3 bytes.
2713                                  */
2714                                 if (len - offset <= 2) {
2715                                         sd_first_printk(KERN_ERR, sdkp,
2716                                                 "Incomplete mode parameter "
2717                                                         "data\n");
2718                                         goto defaults;
2719                                 } else {
2720                                         modepage = page_code;
2721                                         goto Page_found;
2722                                 }
2723                         } else {
2724                                 /* Go to the next page */
2725                                 if (spf && len - offset > 3)
2726                                         offset += 4 + (buffer[offset+2] << 8) +
2727                                                 buffer[offset+3];
2728                                 else if (!spf && len - offset > 1)
2729                                         offset += 2 + buffer[offset+1];
2730                                 else {
2731                                         sd_first_printk(KERN_ERR, sdkp,
2732                                                         "Incomplete mode "
2733                                                         "parameter data\n");
2734                                         goto defaults;
2735                                 }
2736                         }
2737                 }
2738
2739                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2740                 goto defaults;
2741
2742         Page_found:
2743                 if (modepage == 8) {
2744                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2745                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2746                 } else {
2747                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2748                         sdkp->RCD = 0;
2749                 }
2750
2751                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2752                 if (sdp->broken_fua) {
2753                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2754                         sdkp->DPOFUA = 0;
2755                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2756                            !sdkp->device->use_16_for_rw) {
2757                         sd_first_printk(KERN_NOTICE, sdkp,
2758                                   "Uses READ/WRITE(6), disabling FUA\n");
2759                         sdkp->DPOFUA = 0;
2760                 }
2761
2762                 /* No cache flush allowed for write protected devices */
2763                 if (sdkp->WCE && sdkp->write_prot)
2764                         sdkp->WCE = 0;
2765
2766                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2767                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2768                         sd_printk(KERN_NOTICE, sdkp,
2769                                   "Write cache: %s, read cache: %s, %s\n",
2770                                   sdkp->WCE ? "enabled" : "disabled",
2771                                   sdkp->RCD ? "disabled" : "enabled",
2772                                   sdkp->DPOFUA ? "supports DPO and FUA"
2773                                   : "doesn't support DPO or FUA");
2774
2775                 return;
2776         }
2777
2778 bad_sense:
2779         if (scsi_sense_valid(&sshdr) &&
2780             sshdr.sense_key == ILLEGAL_REQUEST &&
2781             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2782                 /* Invalid field in CDB */
2783                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2784         else
2785                 sd_first_printk(KERN_ERR, sdkp,
2786                                 "Asking for cache data failed\n");
2787
2788 defaults:
2789         if (sdp->wce_default_on) {
2790                 sd_first_printk(KERN_NOTICE, sdkp,
2791                                 "Assuming drive cache: write back\n");
2792                 sdkp->WCE = 1;
2793         } else {
2794                 sd_first_printk(KERN_ERR, sdkp,
2795                                 "Assuming drive cache: write through\n");
2796                 sdkp->WCE = 0;
2797         }
2798         sdkp->RCD = 0;
2799         sdkp->DPOFUA = 0;
2800 }
2801
2802 /*
2803  * The ATO bit indicates whether the DIF application tag is available
2804  * for use by the operating system.
2805  */
2806 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2807 {
2808         int res, offset;
2809         struct scsi_device *sdp = sdkp->device;
2810         struct scsi_mode_data data;
2811         struct scsi_sense_hdr sshdr;
2812
2813         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2814                 return;
2815
2816         if (sdkp->protection_type == 0)
2817                 return;
2818
2819         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2820                               SD_MAX_RETRIES, &data, &sshdr);
2821
2822         if (!scsi_status_is_good(res) || !data.header_length ||
2823             data.length < 6) {
2824                 sd_first_printk(KERN_WARNING, sdkp,
2825                           "getting Control mode page failed, assume no ATO\n");
2826
2827                 if (scsi_sense_valid(&sshdr))
2828                         sd_print_sense_hdr(sdkp, &sshdr);
2829
2830                 return;
2831         }
2832
2833         offset = data.header_length + data.block_descriptor_length;
2834
2835         if ((buffer[offset] & 0x3f) != 0x0a) {
2836                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2837                 return;
2838         }
2839
2840         if ((buffer[offset + 5] & 0x80) == 0)
2841                 return;
2842
2843         sdkp->ATO = 1;
2844
2845         return;
2846 }
2847
2848 /**
2849  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2850  * @sdkp: disk to query
2851  */
2852 static void sd_read_block_limits(struct scsi_disk *sdkp)
2853 {
2854         unsigned int sector_sz = sdkp->device->sector_size;
2855         const int vpd_len = 64;
2856         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2857
2858         if (!buffer ||
2859             /* Block Limits VPD */
2860             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2861                 goto out;
2862
2863         blk_queue_io_min(sdkp->disk->queue,
2864                          get_unaligned_be16(&buffer[6]) * sector_sz);
2865
2866         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2867         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2868
2869         if (buffer[3] == 0x3c) {
2870                 unsigned int lba_count, desc_count;
2871
2872                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2873
2874                 if (!sdkp->lbpme)
2875                         goto out;
2876
2877                 lba_count = get_unaligned_be32(&buffer[20]);
2878                 desc_count = get_unaligned_be32(&buffer[24]);
2879
2880                 if (lba_count && desc_count)
2881                         sdkp->max_unmap_blocks = lba_count;
2882
2883                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2884
2885                 if (buffer[32] & 0x80)
2886                         sdkp->unmap_alignment =
2887                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2888
2889                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2890
2891                         if (sdkp->max_unmap_blocks)
2892                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2893                         else
2894                                 sd_config_discard(sdkp, SD_LBP_WS16);
2895
2896                 } else {        /* LBP VPD page tells us what to use */
2897                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2898                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2899                         else if (sdkp->lbpws)
2900                                 sd_config_discard(sdkp, SD_LBP_WS16);
2901                         else if (sdkp->lbpws10)
2902                                 sd_config_discard(sdkp, SD_LBP_WS10);
2903                         else
2904                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2905                 }
2906         }
2907
2908  out:
2909         kfree(buffer);
2910 }
2911
2912 /**
2913  * sd_read_block_characteristics - Query block dev. characteristics
2914  * @sdkp: disk to query
2915  */
2916 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2917 {
2918         struct request_queue *q = sdkp->disk->queue;
2919         unsigned char *buffer;
2920         u16 rot;
2921         const int vpd_len = 64;
2922
2923         buffer = kmalloc(vpd_len, GFP_KERNEL);
2924
2925         if (!buffer ||
2926             /* Block Device Characteristics VPD */
2927             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2928                 goto out;
2929
2930         rot = get_unaligned_be16(&buffer[4]);
2931
2932         if (rot == 1) {
2933                 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2934                 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2935         }
2936
2937         if (sdkp->device->type == TYPE_ZBC) {
2938                 /* Host-managed */
2939                 q->limits.zoned = BLK_ZONED_HM;
2940         } else {
2941                 sdkp->zoned = (buffer[8] >> 4) & 3;
2942                 if (sdkp->zoned == 1)
2943                         /* Host-aware */
2944                         q->limits.zoned = BLK_ZONED_HA;
2945                 else
2946                         /*
2947                          * Treat drive-managed devices as
2948                          * regular block devices.
2949                          */
2950                         q->limits.zoned = BLK_ZONED_NONE;
2951         }
2952         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2953                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2954                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2955
2956  out:
2957         kfree(buffer);
2958 }
2959
2960 /**
2961  * sd_read_block_provisioning - Query provisioning VPD page
2962  * @sdkp: disk to query
2963  */
2964 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2965 {
2966         unsigned char *buffer;
2967         const int vpd_len = 8;
2968
2969         if (sdkp->lbpme == 0)
2970                 return;
2971
2972         buffer = kmalloc(vpd_len, GFP_KERNEL);
2973
2974         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2975                 goto out;
2976
2977         sdkp->lbpvpd    = 1;
2978         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2979         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2980         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2981
2982  out:
2983         kfree(buffer);
2984 }
2985
2986 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2987 {
2988         struct scsi_device *sdev = sdkp->device;
2989
2990         if (sdev->host->no_write_same) {
2991                 sdev->no_write_same = 1;
2992
2993                 return;
2994         }
2995
2996         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2997                 /* too large values might cause issues with arcmsr */
2998                 int vpd_buf_len = 64;
2999
3000                 sdev->no_report_opcodes = 1;
3001
3002                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3003                  * CODES is unsupported and the device has an ATA
3004                  * Information VPD page (SAT).
3005                  */
3006                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3007                         sdev->no_write_same = 1;
3008         }
3009
3010         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3011                 sdkp->ws16 = 1;
3012
3013         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3014                 sdkp->ws10 = 1;
3015 }
3016
3017 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3018 {
3019         struct scsi_device *sdev = sdkp->device;
3020
3021         if (!sdev->security_supported)
3022                 return;
3023
3024         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3025                         SECURITY_PROTOCOL_IN) == 1 &&
3026             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3027                         SECURITY_PROTOCOL_OUT) == 1)
3028                 sdkp->security = 1;
3029 }
3030
3031 /*
3032  * Determine the device's preferred I/O size for reads and writes
3033  * unless the reported value is unreasonably small, large, not a
3034  * multiple of the physical block size, or simply garbage.
3035  */
3036 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3037                                       unsigned int dev_max)
3038 {
3039         struct scsi_device *sdp = sdkp->device;
3040         unsigned int opt_xfer_bytes =
3041                 logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3042
3043         if (sdkp->opt_xfer_blocks == 0)
3044                 return false;
3045
3046         if (sdkp->opt_xfer_blocks > dev_max) {
3047                 sd_first_printk(KERN_WARNING, sdkp,
3048                                 "Optimal transfer size %u logical blocks " \
3049                                 "> dev_max (%u logical blocks)\n",
3050                                 sdkp->opt_xfer_blocks, dev_max);
3051                 return false;
3052         }
3053
3054         if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3055                 sd_first_printk(KERN_WARNING, sdkp,
3056                                 "Optimal transfer size %u logical blocks " \
3057                                 "> sd driver limit (%u logical blocks)\n",
3058                                 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3059                 return false;
3060         }
3061
3062         if (opt_xfer_bytes < PAGE_SIZE) {
3063                 sd_first_printk(KERN_WARNING, sdkp,
3064                                 "Optimal transfer size %u bytes < " \
3065                                 "PAGE_SIZE (%u bytes)\n",
3066                                 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3067                 return false;
3068         }
3069
3070         if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3071                 sd_first_printk(KERN_WARNING, sdkp,
3072                                 "Optimal transfer size %u bytes not a " \
3073                                 "multiple of physical block size (%u bytes)\n",
3074                                 opt_xfer_bytes, sdkp->physical_block_size);
3075                 return false;
3076         }
3077
3078         sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3079                         opt_xfer_bytes);
3080         return true;
3081 }
3082
3083 /**
3084  *      sd_revalidate_disk - called the first time a new disk is seen,
3085  *      performs disk spin up, read_capacity, etc.
3086  *      @disk: struct gendisk we care about
3087  **/
3088 static int sd_revalidate_disk(struct gendisk *disk)
3089 {
3090         struct scsi_disk *sdkp = scsi_disk(disk);
3091         struct scsi_device *sdp = sdkp->device;
3092         struct request_queue *q = sdkp->disk->queue;
3093         sector_t old_capacity = sdkp->capacity;
3094         unsigned char *buffer;
3095         unsigned int dev_max, rw_max;
3096
3097         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3098                                       "sd_revalidate_disk\n"));
3099
3100         /*
3101          * If the device is offline, don't try and read capacity or any
3102          * of the other niceties.
3103          */
3104         if (!scsi_device_online(sdp))
3105                 goto out;
3106
3107         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3108         if (!buffer) {
3109                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3110                           "allocation failure.\n");
3111                 goto out;
3112         }
3113
3114         sd_spinup_disk(sdkp);
3115
3116         /*
3117          * Without media there is no reason to ask; moreover, some devices
3118          * react badly if we do.
3119          */
3120         if (sdkp->media_present) {
3121                 sd_read_capacity(sdkp, buffer);
3122
3123                 /*
3124                  * set the default to rotational.  All non-rotational devices
3125                  * support the block characteristics VPD page, which will
3126                  * cause this to be updated correctly and any device which
3127                  * doesn't support it should be treated as rotational.
3128                  */
3129                 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
3130                 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
3131
3132                 if (scsi_device_supports_vpd(sdp)) {
3133                         sd_read_block_provisioning(sdkp);
3134                         sd_read_block_limits(sdkp);
3135                         sd_read_block_characteristics(sdkp);
3136                         sd_zbc_read_zones(sdkp, buffer);
3137                 }
3138
3139                 sd_print_capacity(sdkp, old_capacity);
3140
3141                 sd_read_write_protect_flag(sdkp, buffer);
3142                 sd_read_cache_type(sdkp, buffer);
3143                 sd_read_app_tag_own(sdkp, buffer);
3144                 sd_read_write_same(sdkp, buffer);
3145                 sd_read_security(sdkp, buffer);
3146         }
3147
3148         /*
3149          * We now have all cache related info, determine how we deal
3150          * with flush requests.
3151          */
3152         sd_set_flush_flag(sdkp);
3153
3154         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3155         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3156
3157         /* Some devices report a maximum block count for READ/WRITE requests. */
3158         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3159         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3160
3161         if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3162                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3163                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3164         } else
3165                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3166                                       (sector_t)BLK_DEF_MAX_SECTORS);
3167
3168         /* Do not exceed controller limit */
3169         rw_max = min(rw_max, queue_max_hw_sectors(q));
3170
3171         /*
3172          * Only update max_sectors if previously unset or if the current value
3173          * exceeds the capabilities of the hardware.
3174          */
3175         if (sdkp->first_scan ||
3176             q->limits.max_sectors > q->limits.max_dev_sectors ||
3177             q->limits.max_sectors > q->limits.max_hw_sectors)
3178                 q->limits.max_sectors = rw_max;
3179
3180         sdkp->first_scan = 0;
3181
3182         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3183         sd_config_write_same(sdkp);
3184         kfree(buffer);
3185
3186  out:
3187         return 0;
3188 }
3189
3190 /**
3191  *      sd_unlock_native_capacity - unlock native capacity
3192  *      @disk: struct gendisk to set capacity for
3193  *
3194  *      Block layer calls this function if it detects that partitions
3195  *      on @disk reach beyond the end of the device.  If the SCSI host
3196  *      implements ->unlock_native_capacity() method, it's invoked to
3197  *      give it a chance to adjust the device capacity.
3198  *
3199  *      CONTEXT:
3200  *      Defined by block layer.  Might sleep.
3201  */
3202 static void sd_unlock_native_capacity(struct gendisk *disk)
3203 {
3204         struct scsi_device *sdev = scsi_disk(disk)->device;
3205
3206         if (sdev->host->hostt->unlock_native_capacity)
3207                 sdev->host->hostt->unlock_native_capacity(sdev);
3208 }
3209
3210 /**
3211  *      sd_format_disk_name - format disk name
3212  *      @prefix: name prefix - ie. "sd" for SCSI disks
3213  *      @index: index of the disk to format name for
3214  *      @buf: output buffer
3215  *      @buflen: length of the output buffer
3216  *
3217  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3218  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3219  *      which is followed by sdaaa.
3220  *
3221  *      This is basically 26 base counting with one extra 'nil' entry
3222  *      at the beginning from the second digit on and can be
3223  *      determined using similar method as 26 base conversion with the
3224  *      index shifted -1 after each digit is computed.
3225  *
3226  *      CONTEXT:
3227  *      Don't care.
3228  *
3229  *      RETURNS:
3230  *      0 on success, -errno on failure.
3231  */
3232 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3233 {
3234         const int base = 'z' - 'a' + 1;
3235         char *begin = buf + strlen(prefix);
3236         char *end = buf + buflen;
3237         char *p;
3238         int unit;
3239
3240         p = end - 1;
3241         *p = '\0';
3242         unit = base;
3243         do {
3244                 if (p == begin)
3245                         return -EINVAL;
3246                 *--p = 'a' + (index % unit);
3247                 index = (index / unit) - 1;
3248         } while (index >= 0);
3249
3250         memmove(begin, p, end - p);
3251         memcpy(buf, prefix, strlen(prefix));
3252
3253         return 0;
3254 }
3255
3256 /*
3257  * The asynchronous part of sd_probe
3258  */
3259 static void sd_probe_async(void *data, async_cookie_t cookie)
3260 {
3261         struct scsi_disk *sdkp = data;
3262         struct scsi_device *sdp;
3263         struct gendisk *gd;
3264         u32 index;
3265         struct device *dev;
3266
3267         sdp = sdkp->device;
3268         gd = sdkp->disk;
3269         index = sdkp->index;
3270         dev = &sdp->sdev_gendev;
3271
3272         gd->major = sd_major((index & 0xf0) >> 4);
3273         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3274
3275         gd->fops = &sd_fops;
3276         gd->private_data = &sdkp->driver;
3277         gd->queue = sdkp->device->request_queue;
3278
3279         /* defaults, until the device tells us otherwise */
3280         sdp->sector_size = 512;
3281         sdkp->capacity = 0;
3282         sdkp->media_present = 1;
3283         sdkp->write_prot = 0;
3284         sdkp->cache_override = 0;
3285         sdkp->WCE = 0;
3286         sdkp->RCD = 0;
3287         sdkp->ATO = 0;
3288         sdkp->first_scan = 1;
3289         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3290
3291         sd_revalidate_disk(gd);
3292
3293         gd->flags = GENHD_FL_EXT_DEVT;
3294         if (sdp->removable) {
3295                 gd->flags |= GENHD_FL_REMOVABLE;
3296                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3297                 gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
3298         }
3299
3300         blk_pm_runtime_init(sdp->request_queue, dev);
3301         device_add_disk(dev, gd, NULL);
3302         if (sdkp->capacity)
3303                 sd_dif_config_host(sdkp);
3304
3305         sd_revalidate_disk(gd);
3306
3307         if (sdkp->security) {
3308                 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3309                 if (sdkp->opal_dev)
3310                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3311         }
3312
3313         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3314                   sdp->removable ? "removable " : "");
3315         scsi_autopm_put_device(sdp);
3316         put_device(&sdkp->dev);
3317 }
3318
3319 /**
3320  *      sd_probe - called during driver initialization and whenever a
3321  *      new scsi device is attached to the system. It is called once
3322  *      for each scsi device (not just disks) present.
3323  *      @dev: pointer to device object
3324  *
3325  *      Returns 0 if successful (or not interested in this scsi device
3326  *      (e.g. scanner)); 1 when there is an error.
3327  *
3328  *      Note: this function is invoked from the scsi mid-level.
3329  *      This function sets up the mapping between a given
3330  *      <host,channel,id,lun> (found in sdp) and new device name
3331  *      (e.g. /dev/sda). More precisely it is the block device major
3332  *      and minor number that is chosen here.
3333  *
3334  *      Assume sd_probe is not re-entrant (for time being)
3335  *      Also think about sd_probe() and sd_remove() running coincidentally.
3336  **/
3337 static int sd_probe(struct device *dev)
3338 {
3339         struct scsi_device *sdp = to_scsi_device(dev);
3340         struct scsi_disk *sdkp;
3341         struct gendisk *gd;
3342         int index;
3343         int error;
3344
3345         scsi_autopm_get_device(sdp);
3346         error = -ENODEV;
3347         if (sdp->type != TYPE_DISK &&
3348             sdp->type != TYPE_ZBC &&
3349             sdp->type != TYPE_MOD &&
3350             sdp->type != TYPE_RBC)
3351                 goto out;
3352
3353 #ifndef CONFIG_BLK_DEV_ZONED
3354         if (sdp->type == TYPE_ZBC)
3355                 goto out;
3356 #endif
3357         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3358                                         "sd_probe\n"));
3359
3360         error = -ENOMEM;
3361         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3362         if (!sdkp)
3363                 goto out;
3364
3365         gd = alloc_disk(SD_MINORS);
3366         if (!gd)
3367                 goto out_free;
3368
3369         index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3370         if (index < 0) {
3371                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3372                 goto out_put;
3373         }
3374
3375         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3376         if (error) {
3377                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3378                 goto out_free_index;
3379         }
3380
3381         sdkp->device = sdp;
3382         sdkp->driver = &sd_template;
3383         sdkp->disk = gd;
3384         sdkp->index = index;
3385         atomic_set(&sdkp->openers, 0);
3386         atomic_set(&sdkp->device->ioerr_cnt, 0);
3387
3388         if (!sdp->request_queue->rq_timeout) {
3389                 if (sdp->type != TYPE_MOD)
3390                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3391                 else
3392                         blk_queue_rq_timeout(sdp->request_queue,
3393                                              SD_MOD_TIMEOUT);
3394         }
3395
3396         device_initialize(&sdkp->dev);
3397         sdkp->dev.parent = dev;
3398         sdkp->dev.class = &sd_disk_class;
3399         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3400
3401         error = device_add(&sdkp->dev);
3402         if (error)
3403                 goto out_free_index;
3404
3405         get_device(dev);
3406         dev_set_drvdata(dev, sdkp);
3407
3408         get_device(&sdkp->dev); /* prevent release before async_schedule */
3409         async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3410
3411         return 0;
3412
3413  out_free_index:
3414         ida_free(&sd_index_ida, index);
3415  out_put:
3416         put_disk(gd);
3417  out_free:
3418         kfree(sdkp);
3419  out:
3420         scsi_autopm_put_device(sdp);
3421         return error;
3422 }
3423
3424 /**
3425  *      sd_remove - called whenever a scsi disk (previously recognized by
3426  *      sd_probe) is detached from the system. It is called (potentially
3427  *      multiple times) during sd module unload.
3428  *      @dev: pointer to device object
3429  *
3430  *      Note: this function is invoked from the scsi mid-level.
3431  *      This function potentially frees up a device name (e.g. /dev/sdc)
3432  *      that could be re-used by a subsequent sd_probe().
3433  *      This function is not called when the built-in sd driver is "exit-ed".
3434  **/
3435 static int sd_remove(struct device *dev)
3436 {
3437         struct scsi_disk *sdkp;
3438         dev_t devt;
3439
3440         sdkp = dev_get_drvdata(dev);
3441         devt = disk_devt(sdkp->disk);
3442         scsi_autopm_get_device(sdkp->device);
3443
3444         async_synchronize_full_domain(&scsi_sd_pm_domain);
3445         async_synchronize_full_domain(&scsi_sd_probe_domain);
3446         device_del(&sdkp->dev);
3447         del_gendisk(sdkp->disk);
3448         sd_shutdown(dev);
3449
3450         free_opal_dev(sdkp->opal_dev);
3451
3452         blk_register_region(devt, SD_MINORS, NULL,
3453                             sd_default_probe, NULL, NULL);
3454
3455         mutex_lock(&sd_ref_mutex);
3456         dev_set_drvdata(dev, NULL);
3457         put_device(&sdkp->dev);
3458         mutex_unlock(&sd_ref_mutex);
3459
3460         return 0;
3461 }
3462
3463 /**
3464  *      scsi_disk_release - Called to free the scsi_disk structure
3465  *      @dev: pointer to embedded class device
3466  *
3467  *      sd_ref_mutex must be held entering this routine.  Because it is
3468  *      called on last put, you should always use the scsi_disk_get()
3469  *      scsi_disk_put() helpers which manipulate the semaphore directly
3470  *      and never do a direct put_device.
3471  **/
3472 static void scsi_disk_release(struct device *dev)
3473 {
3474         struct scsi_disk *sdkp = to_scsi_disk(dev);
3475         struct gendisk *disk = sdkp->disk;
3476         struct request_queue *q = disk->queue;
3477
3478         ida_free(&sd_index_ida, sdkp->index);
3479
3480         /*
3481          * Wait until all requests that are in progress have completed.
3482          * This is necessary to avoid that e.g. scsi_end_request() crashes
3483          * due to clearing the disk->private_data pointer. Wait from inside
3484          * scsi_disk_release() instead of from sd_release() to avoid that
3485          * freezing and unfreezing the request queue affects user space I/O
3486          * in case multiple processes open a /dev/sd... node concurrently.
3487          */
3488         blk_mq_freeze_queue(q);
3489         blk_mq_unfreeze_queue(q);
3490
3491         disk->private_data = NULL;
3492         put_disk(disk);
3493         put_device(&sdkp->device->sdev_gendev);
3494
3495         kfree(sdkp);
3496 }
3497
3498 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3499 {
3500         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3501         struct scsi_sense_hdr sshdr;
3502         struct scsi_device *sdp = sdkp->device;
3503         int res;
3504
3505         if (start)
3506                 cmd[4] |= 1;    /* START */
3507
3508         if (sdp->start_stop_pwr_cond)
3509                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3510
3511         if (!scsi_device_online(sdp))
3512                 return -ENODEV;
3513
3514         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3515                         SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3516         if (res) {
3517                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3518                 if (driver_byte(res) == DRIVER_SENSE)
3519                         sd_print_sense_hdr(sdkp, &sshdr);
3520                 if (scsi_sense_valid(&sshdr) &&
3521                         /* 0x3a is medium not present */
3522                         sshdr.asc == 0x3a)
3523                         res = 0;
3524         }
3525
3526         /* SCSI error codes must not go to the generic layer */
3527         if (res)
3528                 return -EIO;
3529
3530         return 0;
3531 }
3532
3533 /*
3534  * Send a SYNCHRONIZE CACHE instruction down to the device through
3535  * the normal SCSI command structure.  Wait for the command to
3536  * complete.
3537  */
3538 static void sd_shutdown(struct device *dev)
3539 {
3540         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3541
3542         if (!sdkp)
3543                 return;         /* this can happen */
3544
3545         if (pm_runtime_suspended(dev))
3546                 return;
3547
3548         if (sdkp->WCE && sdkp->media_present) {
3549                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3550                 sd_sync_cache(sdkp, NULL);
3551         }
3552
3553         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3554                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3555                 sd_start_stop_device(sdkp, 0);
3556         }
3557 }
3558
3559 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3560 {
3561         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3562         struct scsi_sense_hdr sshdr;
3563         int ret = 0;
3564
3565         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3566                 return 0;
3567
3568         if (sdkp->WCE && sdkp->media_present) {
3569                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3570                 ret = sd_sync_cache(sdkp, &sshdr);
3571
3572                 if (ret) {
3573                         /* ignore OFFLINE device */
3574                         if (ret == -ENODEV)
3575                                 return 0;
3576
3577                         if (!scsi_sense_valid(&sshdr) ||
3578                             sshdr.sense_key != ILLEGAL_REQUEST)
3579                                 return ret;
3580
3581                         /*
3582                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3583                          * doesn't support sync. There's not much to do and
3584                          * suspend shouldn't fail.
3585                          */
3586                         ret = 0;
3587                 }
3588         }
3589
3590         if (sdkp->device->manage_start_stop) {
3591                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3592                 /* an error is not worth aborting a system sleep */
3593                 ret = sd_start_stop_device(sdkp, 0);
3594                 if (ignore_stop_errors)
3595                         ret = 0;
3596         }
3597
3598         return ret;
3599 }
3600
3601 static int sd_suspend_system(struct device *dev)
3602 {
3603         return sd_suspend_common(dev, true);
3604 }
3605
3606 static int sd_suspend_runtime(struct device *dev)
3607 {
3608         return sd_suspend_common(dev, false);
3609 }
3610
3611 static int sd_resume(struct device *dev)
3612 {
3613         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3614         int ret;
3615
3616         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3617                 return 0;
3618
3619         if (!sdkp->device->manage_start_stop)
3620                 return 0;
3621
3622         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3623         ret = sd_start_stop_device(sdkp, 1);
3624         if (!ret)
3625                 opal_unlock_from_suspend(sdkp->opal_dev);
3626         return ret;
3627 }
3628
3629 /**
3630  *      init_sd - entry point for this driver (both when built in or when
3631  *      a module).
3632  *
3633  *      Note: this function registers this driver with the scsi mid-level.
3634  **/
3635 static int __init init_sd(void)
3636 {
3637         int majors = 0, i, err;
3638
3639         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3640
3641         for (i = 0; i < SD_MAJORS; i++) {
3642                 if (register_blkdev(sd_major(i), "sd") != 0)
3643                         continue;
3644                 majors++;
3645                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3646                                     sd_default_probe, NULL, NULL);
3647         }
3648
3649         if (!majors)
3650                 return -ENODEV;
3651
3652         err = class_register(&sd_disk_class);
3653         if (err)
3654                 goto err_out;
3655
3656         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3657                                          0, 0, NULL);
3658         if (!sd_cdb_cache) {
3659                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3660                 err = -ENOMEM;
3661                 goto err_out_class;
3662         }
3663
3664         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3665         if (!sd_cdb_pool) {
3666                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3667                 err = -ENOMEM;
3668                 goto err_out_cache;
3669         }
3670
3671         sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
3672         if (!sd_page_pool) {
3673                 printk(KERN_ERR "sd: can't init discard page pool\n");
3674                 err = -ENOMEM;
3675                 goto err_out_ppool;
3676         }
3677
3678         err = scsi_register_driver(&sd_template.gendrv);
3679         if (err)
3680                 goto err_out_driver;
3681
3682         return 0;
3683
3684 err_out_driver:
3685         mempool_destroy(sd_page_pool);
3686
3687 err_out_ppool:
3688         mempool_destroy(sd_cdb_pool);
3689
3690 err_out_cache:
3691         kmem_cache_destroy(sd_cdb_cache);
3692
3693 err_out_class:
3694         class_unregister(&sd_disk_class);
3695 err_out:
3696         for (i = 0; i < SD_MAJORS; i++)
3697                 unregister_blkdev(sd_major(i), "sd");
3698         return err;
3699 }
3700
3701 /**
3702  *      exit_sd - exit point for this driver (when it is a module).
3703  *
3704  *      Note: this function unregisters this driver from the scsi mid-level.
3705  **/
3706 static void __exit exit_sd(void)
3707 {
3708         int i;
3709
3710         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3711
3712         scsi_unregister_driver(&sd_template.gendrv);
3713         mempool_destroy(sd_cdb_pool);
3714         mempool_destroy(sd_page_pool);
3715         kmem_cache_destroy(sd_cdb_cache);
3716
3717         class_unregister(&sd_disk_class);
3718
3719         for (i = 0; i < SD_MAJORS; i++) {
3720                 blk_unregister_region(sd_major(i), SD_MINORS);
3721                 unregister_blkdev(sd_major(i), "sd");
3722         }
3723 }
3724
3725 module_init(init_sd);
3726 module_exit(exit_sd);
3727
3728 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3729                                struct scsi_sense_hdr *sshdr)
3730 {
3731         scsi_print_sense_hdr(sdkp->device,
3732                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3733 }
3734
3735 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3736                             int result)
3737 {
3738         const char *hb_string = scsi_hostbyte_string(result);
3739         const char *db_string = scsi_driverbyte_string(result);
3740
3741         if (hb_string || db_string)
3742                 sd_printk(KERN_INFO, sdkp,
3743                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3744                           hb_string ? hb_string : "invalid",
3745                           db_string ? db_string : "invalid");
3746         else
3747                 sd_printk(KERN_INFO, sdkp,
3748                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3749                           msg, host_byte(result), driver_byte(result));
3750 }
3751