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
 126 static DEFINE_IDA(sd_index_ida);
 127
 128 /* This semaphore is used to mediate the 0->1 reference get in the
 129  * face of object destruction (i.e. we can't allow a get on an
 130  * object after last put) */
 131 static DEFINE_MUTEX(sd_ref_mutex);
 132
 133 static struct kmem_cache *sd_cdb_cache;
 134 static mempool_t *sd_cdb_pool;
 135 static mempool_t *sd_page_pool;
 136
 137 static const char *sd_cache_types[] = {
 138         "write through", "none", "write back",
 139         "write back, no read (daft)"
 140 };
 141
 142 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 143 {
 144         bool wc = false, fua = false;
 145
 146         if (sdkp->WCE) {
 147                 wc = true;
 148                 if (sdkp->DPOFUA)
 149                         fua = true;
 150         }
 151
 152         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 153 }
 154
 155 static ssize_t
 156 cache_type_store(struct device *dev, struct device_attribute *attr,
 157                  const char *buf, size_t count)
 158 {
 159         int ct, rcd, wce, sp;
 160         struct scsi_disk *sdkp = to_scsi_disk(dev);
 161         struct scsi_device *sdp = sdkp->device;
 162         char buffer[64];
 163         char *buffer_data;
 164         struct scsi_mode_data data;
 165         struct scsi_sense_hdr sshdr;
 166         static const char temp[] = "temporary ";
 167         int len;
 168
 169         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 170                 /* no cache control on RBC devices; theoretically they
 171                  * can do it, but there's probably so many exceptions
 172                  * it's not worth the risk */
 173                 return -EINVAL;
 174
 175         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 176                 buf += sizeof(temp) - 1;
 177                 sdkp->cache_override = 1;
 178         } else {
 179                 sdkp->cache_override = 0;
 180         }
 181
 182         ct = sysfs_match_string(sd_cache_types, buf);
 183         if (ct < 0)
 184                 return -EINVAL;
 185
 186         rcd = ct & 0x01 ? 1 : 0;
 187         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 188
 189         if (sdkp->cache_override) {
 190                 sdkp->WCE = wce;
 191                 sdkp->RCD = rcd;
 192                 sd_set_flush_flag(sdkp);
 193                 return count;
 194         }
 195
 196         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 197                             SD_MAX_RETRIES, &data, NULL))
 198                 return -EINVAL;
 199         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 200                   data.block_descriptor_length);
 201         buffer_data = buffer + data.header_length +
 202                 data.block_descriptor_length;
 203         buffer_data[2] &= ~0x05;
 204         buffer_data[2] |= wce << 2 | rcd;
 205         sp = buffer_data[0] & 0x80 ? 1 : 0;
 206         buffer_data[0] &= ~0x80;
 207
 208         /*
 209          * Ensure WP, DPOFUA, and RESERVED fields are cleared in
 210          * received mode parameter buffer before doing MODE SELECT.
 211          */
 212         data.device_specific = 0;
 213
 214         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 215                              SD_MAX_RETRIES, &data, &sshdr)) {
 216                 if (scsi_sense_valid(&sshdr))
 217                         sd_print_sense_hdr(sdkp, &sshdr);
 218                 return -EINVAL;
 219         }
 220         revalidate_disk(sdkp->disk);
 221         return count;
 222 }
 223
 224 static ssize_t
 225 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 226                        char *buf)
 227 {
 228         struct scsi_disk *sdkp = to_scsi_disk(dev);
 229         struct scsi_device *sdp = sdkp->device;
 230
 231         return sprintf(buf, "%u\n", sdp->manage_start_stop);
 232 }
 233
 234 static ssize_t
 235 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 236                         const char *buf, size_t count)
 237 {
 238         struct scsi_disk *sdkp = to_scsi_disk(dev);
 239         struct scsi_device *sdp = sdkp->device;
 240         bool v;
 241
 242         if (!capable(CAP_SYS_ADMIN))
 243                 return -EACCES;
 244
 245         if (kstrtobool(buf, &v))
 246                 return -EINVAL;
 247
 248         sdp->manage_start_stop = v;
 249
 250         return count;
 251 }
 252 static DEVICE_ATTR_RW(manage_start_stop);
 253
 254 static ssize_t
 255 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 256 {
 257         struct scsi_disk *sdkp = to_scsi_disk(dev);
 258
 259         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 260 }
 261
 262 static ssize_t
 263 allow_restart_store(struct device *dev, struct device_attribute *attr,
 264                     const char *buf, size_t count)
 265 {
 266         bool v;
 267         struct scsi_disk *sdkp = to_scsi_disk(dev);
 268         struct scsi_device *sdp = sdkp->device;
 269
 270         if (!capable(CAP_SYS_ADMIN))
 271                 return -EACCES;
 272
 273         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 274                 return -EINVAL;
 275
 276         if (kstrtobool(buf, &v))
 277                 return -EINVAL;
 278
 279         sdp->allow_restart = v;
 280
 281         return count;
 282 }
 283 static DEVICE_ATTR_RW(allow_restart);
 284
 285 static ssize_t
 286 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 287 {
 288         struct scsi_disk *sdkp = to_scsi_disk(dev);
 289         int ct = sdkp->RCD + 2*sdkp->WCE;
 290
 291         return sprintf(buf, "%s\n", sd_cache_types[ct]);
 292 }
 293 static DEVICE_ATTR_RW(cache_type);
 294
 295 static ssize_t
 296 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 297 {
 298         struct scsi_disk *sdkp = to_scsi_disk(dev);
 299
 300         return sprintf(buf, "%u\n", sdkp->DPOFUA);
 301 }
 302 static DEVICE_ATTR_RO(FUA);
 303
 304 static ssize_t
 305 protection_type_show(struct device *dev, struct device_attribute *attr,
 306                      char *buf)
 307 {
 308         struct scsi_disk *sdkp = to_scsi_disk(dev);
 309
 310         return sprintf(buf, "%u\n", sdkp->protection_type);
 311 }
 312
 313 static ssize_t
 314 protection_type_store(struct device *dev, struct device_attribute *attr,
 315                       const char *buf, size_t count)
 316 {
 317         struct scsi_disk *sdkp = to_scsi_disk(dev);
 318         unsigned int val;
 319         int err;
 320
 321         if (!capable(CAP_SYS_ADMIN))
 322                 return -EACCES;
 323
 324         err = kstrtouint(buf, 10, &val);
 325
 326         if (err)
 327                 return err;
 328
 329         if (val <= T10_PI_TYPE3_PROTECTION)
 330                 sdkp->protection_type = val;
 331
 332         return count;
 333 }
 334 static DEVICE_ATTR_RW(protection_type);
 335
 336 static ssize_t
 337 protection_mode_show(struct device *dev, struct device_attribute *attr,
 338                      char *buf)
 339 {
 340         struct scsi_disk *sdkp = to_scsi_disk(dev);
 341         struct scsi_device *sdp = sdkp->device;
 342         unsigned int dif, dix;
 343
 344         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 345         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 346
 347         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 348                 dif = 0;
 349                 dix = 1;
 350         }
 351
 352         if (!dif && !dix)
 353                 return sprintf(buf, "none\n");
 354
 355         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 356 }
 357 static DEVICE_ATTR_RO(protection_mode);
 358
 359 static ssize_t
 360 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 361 {
 362         struct scsi_disk *sdkp = to_scsi_disk(dev);
 363
 364         return sprintf(buf, "%u\n", sdkp->ATO);
 365 }
 366 static DEVICE_ATTR_RO(app_tag_own);
 367
 368 static ssize_t
 369 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 370                        char *buf)
 371 {
 372         struct scsi_disk *sdkp = to_scsi_disk(dev);
 373
 374         return sprintf(buf, "%u\n", sdkp->lbpme);
 375 }
 376 static DEVICE_ATTR_RO(thin_provisioning);
 377
 378 /* sysfs_match_string() requires dense arrays */
 379 static const char *lbp_mode[] = {
 380         [SD_LBP_FULL]           = "full",
 381         [SD_LBP_UNMAP]          = "unmap",
 382         [SD_LBP_WS16]           = "writesame_16",
 383         [SD_LBP_WS10]           = "writesame_10",
 384         [SD_LBP_ZERO]           = "writesame_zero",
 385         [SD_LBP_DISABLE]        = "disabled",
 386 };
 387
 388 static ssize_t
 389 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 390                        char *buf)
 391 {
 392         struct scsi_disk *sdkp = to_scsi_disk(dev);
 393
 394         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 395 }
 396
 397 static ssize_t
 398 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 399                         const char *buf, size_t count)
 400 {
 401         struct scsi_disk *sdkp = to_scsi_disk(dev);
 402         struct scsi_device *sdp = sdkp->device;
 403         int mode;
 404
 405         if (!capable(CAP_SYS_ADMIN))
 406                 return -EACCES;
 407
 408         if (sd_is_zoned(sdkp)) {
 409                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 410                 return count;
 411         }
 412
 413         if (sdp->type != TYPE_DISK)
 414                 return -EINVAL;
 415
 416         mode = sysfs_match_string(lbp_mode, buf);
 417         if (mode < 0)
 418                 return -EINVAL;
 419
 420         sd_config_discard(sdkp, mode);
 421
 422         return count;
 423 }
 424 static DEVICE_ATTR_RW(provisioning_mode);
 425
 426 /* sysfs_match_string() requires dense arrays */
 427 static const char *zeroing_mode[] = {
 428         [SD_ZERO_WRITE]         = "write",
 429         [SD_ZERO_WS]            = "writesame",
 430         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 431         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 432 };
 433
 434 static ssize_t
 435 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 436                   char *buf)
 437 {
 438         struct scsi_disk *sdkp = to_scsi_disk(dev);
 439
 440         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 441 }
 442
 443 static ssize_t
 444 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 445                    const char *buf, size_t count)
 446 {
 447         struct scsi_disk *sdkp = to_scsi_disk(dev);
 448         int mode;
 449
 450         if (!capable(CAP_SYS_ADMIN))
 451                 return -EACCES;
 452
 453         mode = sysfs_match_string(zeroing_mode, buf);
 454         if (mode < 0)
 455                 return -EINVAL;
 456
 457         sdkp->zeroing_mode = mode;
 458
 459         return count;
 460 }
 461 static DEVICE_ATTR_RW(zeroing_mode);
 462
 463 static ssize_t
 464 max_medium_access_timeouts_show(struct device *dev,
 465                                 struct device_attribute *attr, char *buf)
 466 {
 467         struct scsi_disk *sdkp = to_scsi_disk(dev);
 468
 469         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 470 }
 471
 472 static ssize_t
 473 max_medium_access_timeouts_store(struct device *dev,
 474                                  struct device_attribute *attr, const char *buf,
 475                                  size_t count)
 476 {
 477         struct scsi_disk *sdkp = to_scsi_disk(dev);
 478         int err;
 479
 480         if (!capable(CAP_SYS_ADMIN))
 481                 return -EACCES;
 482
 483         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 484
 485         return err ? err : count;
 486 }
 487 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 488
 489 static ssize_t
 490 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 491                            char *buf)
 492 {
 493         struct scsi_disk *sdkp = to_scsi_disk(dev);
 494
 495         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 496 }
 497
 498 static ssize_t
 499 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 500                             const char *buf, size_t count)
 501 {
 502         struct scsi_disk *sdkp = to_scsi_disk(dev);
 503         struct scsi_device *sdp = sdkp->device;
 504         unsigned long max;
 505         int err;
 506
 507         if (!capable(CAP_SYS_ADMIN))
 508                 return -EACCES;
 509
 510         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 511                 return -EINVAL;
 512
 513         err = kstrtoul(buf, 10, &max);
 514
 515         if (err)
 516                 return err;
 517
 518         if (max == 0)
 519                 sdp->no_write_same = 1;
 520         else if (max <= SD_MAX_WS16_BLOCKS) {
 521                 sdp->no_write_same = 0;
 522                 sdkp->max_ws_blocks = max;
 523         }
 524
 525         sd_config_write_same(sdkp);
 526
 527         return count;
 528 }
 529 static DEVICE_ATTR_RW(max_write_same_blocks);
 530
 531 static struct attribute *sd_disk_attrs[] = {
 532         &dev_attr_cache_type.attr,
 533         &dev_attr_FUA.attr,
 534         &dev_attr_allow_restart.attr,
 535         &dev_attr_manage_start_stop.attr,
 536         &dev_attr_protection_type.attr,
 537         &dev_attr_protection_mode.attr,
 538         &dev_attr_app_tag_own.attr,
 539         &dev_attr_thin_provisioning.attr,
 540         &dev_attr_provisioning_mode.attr,
 541         &dev_attr_zeroing_mode.attr,
 542         &dev_attr_max_write_same_blocks.attr,
 543         &dev_attr_max_medium_access_timeouts.attr,
 544         NULL,
 545 };
 546 ATTRIBUTE_GROUPS(sd_disk);
 547
 548 static struct class sd_disk_class = {
 549         .name           = "scsi_disk",
 550         .owner          = THIS_MODULE,
 551         .dev_release    = scsi_disk_release,
 552         .dev_groups     = sd_disk_groups,
 553 };
 554
 555 static const struct dev_pm_ops sd_pm_ops = {
 556         .suspend                = sd_suspend_system,
 557         .resume                 = sd_resume,
 558         .poweroff               = sd_suspend_system,
 559         .restore                = sd_resume,
 560         .runtime_suspend        = sd_suspend_runtime,
 561         .runtime_resume         = sd_resume,
 562 };
 563
 564 static struct scsi_driver sd_template = {
 565         .gendrv = {
 566                 .name           = "sd",
 567                 .owner          = THIS_MODULE,
 568                 .probe          = sd_probe,
 569                 .probe_type     = PROBE_PREFER_ASYNCHRONOUS,
 570                 .remove         = sd_remove,
 571                 .shutdown       = sd_shutdown,
 572                 .pm             = &sd_pm_ops,
 573         },
 574         .rescan                 = sd_rescan,
 575         .init_command           = sd_init_command,
 576         .uninit_command         = sd_uninit_command,
 577         .done                   = sd_done,
 578         .eh_action              = sd_eh_action,
 579         .eh_reset               = sd_eh_reset,
 580 };
 581
 582 /*
 583  * Dummy kobj_map->probe function.
 584  * The default ->probe function will call modprobe, which is
 585  * pointless as this module is already loaded.
 586  */
 587 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 588 {
 589         return NULL;
 590 }
 591
 592 /*
 593  * Device no to disk mapping:
 594  *
 595  *       major         disc2     disc  p1
 596  *   |............|.............|....|....| <- dev_t
 597  *    31        20 19          8 7  4 3  0
 598  *
 599  * Inside a major, we have 16k disks, however mapped non-
 600  * contiguously. The first 16 disks are for major0, the next
 601  * ones with major1, ... Disk 256 is for major0 again, disk 272
 602  * for major1, ...
 603  * As we stay compatible with our numbering scheme, we can reuse
 604  * the well-know SCSI majors 8, 65--71, 136--143.
 605  */
 606 static int sd_major(int major_idx)
 607 {
 608         switch (major_idx) {
 609         case 0:
 610                 return SCSI_DISK0_MAJOR;
 611         case 1 ... 7:
 612                 return SCSI_DISK1_MAJOR + major_idx - 1;
 613         case 8 ... 15:
 614                 return SCSI_DISK8_MAJOR + major_idx - 8;
 615         default:
 616                 BUG();
 617                 return 0;       /* shut up gcc */
 618         }
 619 }
 620
 621 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 622 {
 623         struct scsi_disk *sdkp = NULL;
 624
 625         mutex_lock(&sd_ref_mutex);
 626
 627         if (disk->private_data) {
 628                 sdkp = scsi_disk(disk);
 629                 if (scsi_device_get(sdkp->device) == 0)
 630                         get_device(&sdkp->dev);
 631                 else
 632                         sdkp = NULL;
 633         }
 634         mutex_unlock(&sd_ref_mutex);
 635         return sdkp;
 636 }
 637
 638 static void scsi_disk_put(struct scsi_disk *sdkp)
 639 {
 640         struct scsi_device *sdev = sdkp->device;
 641
 642         mutex_lock(&sd_ref_mutex);
 643         put_device(&sdkp->dev);
 644         scsi_device_put(sdev);
 645         mutex_unlock(&sd_ref_mutex);
 646 }
 647
 648 #ifdef CONFIG_BLK_SED_OPAL
 649 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
 650                 size_t len, bool send)
 651 {
 652         struct scsi_device *sdev = data;
 653         u8 cdb[12] = { 0, };
 654         int ret;
 655
 656         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
 657         cdb[1] = secp;
 658         put_unaligned_be16(spsp, &cdb[2]);
 659         put_unaligned_be32(len, &cdb[6]);
 660
 661         ret = scsi_execute_req(sdev, cdb,
 662                         send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
 663                         buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
 664         return ret <= 0 ? ret : -EIO;
 665 }
 666 #endif /* CONFIG_BLK_SED_OPAL */
 667
 668 /*
 669  * Look up the DIX operation based on whether the command is read or
 670  * write and whether dix and dif are enabled.
 671  */
 672 static unsigned int sd_prot_op(bool write, bool dix, bool dif)
 673 {
 674         /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
 675         static const unsigned int ops[] = {     /* wrt dix dif */
 676                 SCSI_PROT_NORMAL,               /*  0   0   0  */
 677                 SCSI_PROT_READ_STRIP,           /*  0   0   1  */
 678                 SCSI_PROT_READ_INSERT,          /*  0   1   0  */
 679                 SCSI_PROT_READ_PASS,            /*  0   1   1  */
 680                 SCSI_PROT_NORMAL,               /*  1   0   0  */
 681                 SCSI_PROT_WRITE_INSERT,         /*  1   0   1  */
 682                 SCSI_PROT_WRITE_STRIP,          /*  1   1   0  */
 683                 SCSI_PROT_WRITE_PASS,           /*  1   1   1  */
 684         };
 685
 686         return ops[write << 2 | dix << 1 | dif];
 687 }
 688
 689 /*
 690  * Returns a mask of the protection flags that are valid for a given DIX
 691  * operation.
 692  */
 693 static unsigned int sd_prot_flag_mask(unsigned int prot_op)
 694 {
 695         static const unsigned int flag_mask[] = {
 696                 [SCSI_PROT_NORMAL]              = 0,
 697
 698                 [SCSI_PROT_READ_STRIP]          = SCSI_PROT_TRANSFER_PI |
 699                                                   SCSI_PROT_GUARD_CHECK |
 700                                                   SCSI_PROT_REF_CHECK |
 701                                                   SCSI_PROT_REF_INCREMENT,
 702
 703                 [SCSI_PROT_READ_INSERT]         = SCSI_PROT_REF_INCREMENT |
 704                                                   SCSI_PROT_IP_CHECKSUM,
 705
 706                 [SCSI_PROT_READ_PASS]           = SCSI_PROT_TRANSFER_PI |
 707                                                   SCSI_PROT_GUARD_CHECK |
 708                                                   SCSI_PROT_REF_CHECK |
 709                                                   SCSI_PROT_REF_INCREMENT |
 710                                                   SCSI_PROT_IP_CHECKSUM,
 711
 712                 [SCSI_PROT_WRITE_INSERT]        = SCSI_PROT_TRANSFER_PI |
 713                                                   SCSI_PROT_REF_INCREMENT,
 714
 715                 [SCSI_PROT_WRITE_STRIP]         = SCSI_PROT_GUARD_CHECK |
 716                                                   SCSI_PROT_REF_CHECK |
 717                                                   SCSI_PROT_REF_INCREMENT |
 718                                                   SCSI_PROT_IP_CHECKSUM,
 719
 720                 [SCSI_PROT_WRITE_PASS]          = SCSI_PROT_TRANSFER_PI |
 721                                                   SCSI_PROT_GUARD_CHECK |
 722                                                   SCSI_PROT_REF_CHECK |
 723                                                   SCSI_PROT_REF_INCREMENT |
 724                                                   SCSI_PROT_IP_CHECKSUM,
 725         };
 726
 727         return flag_mask[prot_op];
 728 }
 729
 730 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 731                                            unsigned int dix, unsigned int dif)
 732 {
 733         struct bio *bio = scmd->request->bio;
 734         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 735         unsigned int protect = 0;
 736
 737         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 738                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 739                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 740
 741                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 742                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 743         }
 744
 745         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 746                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 747
 748                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 749                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 750         }
 751
 752         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 753                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 754
 755                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 756                         protect = 3 << 5;       /* Disable target PI checking */
 757                 else
 758                         protect = 1 << 5;       /* Enable target PI checking */
 759         }
 760
 761         scsi_set_prot_op(scmd, prot_op);
 762         scsi_set_prot_type(scmd, dif);
 763         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 764
 765         return protect;
 766 }
 767
 768 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 769 {
 770         struct request_queue *q = sdkp->disk->queue;
 771         unsigned int logical_block_size = sdkp->device->sector_size;
 772         unsigned int max_blocks = 0;
 773
 774         q->limits.discard_alignment =
 775                 sdkp->unmap_alignment * logical_block_size;
 776         q->limits.discard_granularity =
 777                 max(sdkp->physical_block_size,
 778                     sdkp->unmap_granularity * logical_block_size);
 779         sdkp->provisioning_mode = mode;
 780
 781         switch (mode) {
 782
 783         case SD_LBP_FULL:
 784         case SD_LBP_DISABLE:
 785                 blk_queue_max_discard_sectors(q, 0);
 786                 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 787                 return;
 788
 789         case SD_LBP_UNMAP:
 790                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 791                                           (u32)SD_MAX_WS16_BLOCKS);
 792                 break;
 793
 794         case SD_LBP_WS16:
 795                 if (sdkp->device->unmap_limit_for_ws)
 796                         max_blocks = sdkp->max_unmap_blocks;
 797                 else
 798                         max_blocks = sdkp->max_ws_blocks;
 799
 800                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
 801                 break;
 802
 803         case SD_LBP_WS10:
 804                 if (sdkp->device->unmap_limit_for_ws)
 805                         max_blocks = sdkp->max_unmap_blocks;
 806                 else
 807                         max_blocks = sdkp->max_ws_blocks;
 808
 809                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
 810                 break;
 811
 812         case SD_LBP_ZERO:
 813                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 814                                           (u32)SD_MAX_WS10_BLOCKS);
 815                 break;
 816         }
 817
 818         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 819         blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 820 }
 821
 822 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 823 {
 824         struct scsi_device *sdp = cmd->device;
 825         struct request *rq = cmd->request;
 826         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 827         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 828         unsigned int data_len = 24;
 829         char *buf;
 830
 831         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 832         if (!rq->special_vec.bv_page)
 833                 return BLK_STS_RESOURCE;
 834         clear_highpage(rq->special_vec.bv_page);
 835         rq->special_vec.bv_offset = 0;
 836         rq->special_vec.bv_len = data_len;
 837         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 838
 839         cmd->cmd_len = 10;
 840         cmd->cmnd[0] = UNMAP;
 841         cmd->cmnd[8] = 24;
 842
 843         buf = page_address(rq->special_vec.bv_page);
 844         put_unaligned_be16(6 + 16, &buf[0]);
 845         put_unaligned_be16(16, &buf[2]);
 846         put_unaligned_be64(lba, &buf[8]);
 847         put_unaligned_be32(nr_blocks, &buf[16]);
 848
 849         cmd->allowed = SD_MAX_RETRIES;
 850         cmd->transfersize = data_len;
 851         rq->timeout = SD_TIMEOUT;
 852
 853         return scsi_init_io(cmd);
 854 }
 855
 856 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
 857                 bool unmap)
 858 {
 859         struct scsi_device *sdp = cmd->device;
 860         struct request *rq = cmd->request;
 861         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 862         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 863         u32 data_len = sdp->sector_size;
 864
 865         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 866         if (!rq->special_vec.bv_page)
 867                 return BLK_STS_RESOURCE;
 868         clear_highpage(rq->special_vec.bv_page);
 869         rq->special_vec.bv_offset = 0;
 870         rq->special_vec.bv_len = data_len;
 871         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 872
 873         cmd->cmd_len = 16;
 874         cmd->cmnd[0] = WRITE_SAME_16;
 875         if (unmap)
 876                 cmd->cmnd[1] = 0x8; /* UNMAP */
 877         put_unaligned_be64(lba, &cmd->cmnd[2]);
 878         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
 879
 880         cmd->allowed = SD_MAX_RETRIES;
 881         cmd->transfersize = data_len;
 882         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 883
 884         return scsi_init_io(cmd);
 885 }
 886
 887 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
 888                 bool unmap)
 889 {
 890         struct scsi_device *sdp = cmd->device;
 891         struct request *rq = cmd->request;
 892         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 893         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 894         u32 data_len = sdp->sector_size;
 895
 896         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 897         if (!rq->special_vec.bv_page)
 898                 return BLK_STS_RESOURCE;
 899         clear_highpage(rq->special_vec.bv_page);
 900         rq->special_vec.bv_offset = 0;
 901         rq->special_vec.bv_len = data_len;
 902         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 903
 904         cmd->cmd_len = 10;
 905         cmd->cmnd[0] = WRITE_SAME;
 906         if (unmap)
 907                 cmd->cmnd[1] = 0x8; /* UNMAP */
 908         put_unaligned_be32(lba, &cmd->cmnd[2]);
 909         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
 910
 911         cmd->allowed = SD_MAX_RETRIES;
 912         cmd->transfersize = data_len;
 913         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 914
 915         return scsi_init_io(cmd);
 916 }
 917
 918 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 919 {
 920         struct request *rq = cmd->request;
 921         struct scsi_device *sdp = cmd->device;
 922         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 923         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 924         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 925
 926         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 927                 switch (sdkp->zeroing_mode) {
 928                 case SD_ZERO_WS16_UNMAP:
 929                         return sd_setup_write_same16_cmnd(cmd, true);
 930                 case SD_ZERO_WS10_UNMAP:
 931                         return sd_setup_write_same10_cmnd(cmd, true);
 932                 }
 933         }
 934
 935         if (sdp->no_write_same)
 936                 return BLK_STS_TARGET;
 937
 938         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
 939                 return sd_setup_write_same16_cmnd(cmd, false);
 940
 941         return sd_setup_write_same10_cmnd(cmd, false);
 942 }
 943
 944 static void sd_config_write_same(struct scsi_disk *sdkp)
 945 {
 946         struct request_queue *q = sdkp->disk->queue;
 947         unsigned int logical_block_size = sdkp->device->sector_size;
 948
 949         if (sdkp->device->no_write_same) {
 950                 sdkp->max_ws_blocks = 0;
 951                 goto out;
 952         }
 953
 954         /* Some devices can not handle block counts above 0xffff despite
 955          * supporting WRITE SAME(16). Consequently we default to 64k
 956          * blocks per I/O unless the device explicitly advertises a
 957          * bigger limit.
 958          */
 959         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 960                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 961                                                    (u32)SD_MAX_WS16_BLOCKS);
 962         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 963                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 964                                                    (u32)SD_MAX_WS10_BLOCKS);
 965         else {
 966                 sdkp->device->no_write_same = 1;
 967                 sdkp->max_ws_blocks = 0;
 968         }
 969
 970         if (sdkp->lbprz && sdkp->lbpws)
 971                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 972         else if (sdkp->lbprz && sdkp->lbpws10)
 973                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 974         else if (sdkp->max_ws_blocks)
 975                 sdkp->zeroing_mode = SD_ZERO_WS;
 976         else
 977                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 978
 979         if (sdkp->max_ws_blocks &&
 980             sdkp->physical_block_size > logical_block_size) {
 981                 /*
 982                  * Reporting a maximum number of blocks that is not aligned
 983                  * on the device physical size would cause a large write same
 984                  * request to be split into physically unaligned chunks by
 985                  * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
 986                  * even if the caller of these functions took care to align the
 987                  * large request. So make sure the maximum reported is aligned
 988                  * to the device physical block size. This is only an optional
 989                  * optimization for regular disks, but this is mandatory to
 990                  * avoid failure of large write same requests directed at
 991                  * sequential write required zones of host-managed ZBC disks.
 992                  */
 993                 sdkp->max_ws_blocks =
 994                         round_down(sdkp->max_ws_blocks,
 995                                    bytes_to_logical(sdkp->device,
 996                                                     sdkp->physical_block_size));
 997         }
 998
 999 out:
1000         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
1001                                          (logical_block_size >> 9));
1002         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
1003                                          (logical_block_size >> 9));
1004 }
1005
1006 /**
1007  * sd_setup_write_same_cmnd - write the same data to multiple blocks
1008  * @cmd: command to prepare
1009  *
1010  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
1011  * the preference indicated by the target device.
1012  **/
1013 static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
1014 {
1015         struct request *rq = cmd->request;
1016         struct scsi_device *sdp = cmd->device;
1017         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1018         struct bio *bio = rq->bio;
1019         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1020         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1021         blk_status_t ret;
1022
1023         if (sdkp->device->no_write_same)
1024                 return BLK_STS_TARGET;
1025
1026         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
1027
1028         rq->timeout = SD_WRITE_SAME_TIMEOUT;
1029
1030         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) {
1031                 cmd->cmd_len = 16;
1032                 cmd->cmnd[0] = WRITE_SAME_16;
1033                 put_unaligned_be64(lba, &cmd->cmnd[2]);
1034                 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1035         } else {
1036                 cmd->cmd_len = 10;
1037                 cmd->cmnd[0] = WRITE_SAME;
1038                 put_unaligned_be32(lba, &cmd->cmnd[2]);
1039                 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1040         }
1041
1042         cmd->transfersize = sdp->sector_size;
1043         cmd->allowed = SD_MAX_RETRIES;
1044
1045         /*
1046          * For WRITE SAME the data transferred via the DATA OUT buffer is
1047          * different from the amount of data actually written to the target.
1048          *
1049          * We set up __data_len to the amount of data transferred via the
1050          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
1051          * to transfer a single sector of data first, but then reset it to
1052          * the amount of data to be written right after so that the I/O path
1053          * knows how much to actually write.
1054          */
1055         rq->__data_len = sdp->sector_size;
1056         ret = scsi_init_io(cmd);
1057         rq->__data_len = blk_rq_bytes(rq);
1058
1059         return ret;
1060 }
1061
1062 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1063 {
1064         struct request *rq = cmd->request;
1065
1066         /* flush requests don't perform I/O, zero the S/G table */
1067         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1068
1069         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1070         cmd->cmd_len = 10;
1071         cmd->transfersize = 0;
1072         cmd->allowed = SD_MAX_RETRIES;
1073
1074         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1075         return BLK_STS_OK;
1076 }
1077
1078 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1079                                        sector_t lba, unsigned int nr_blocks,
1080                                        unsigned char flags)
1081 {
1082         cmd->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1083         if (unlikely(cmd->cmnd == NULL))
1084                 return BLK_STS_RESOURCE;
1085
1086         cmd->cmd_len = SD_EXT_CDB_SIZE;
1087         memset(cmd->cmnd, 0, cmd->cmd_len);
1088
1089         cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
1090         cmd->cmnd[7]  = 0x18; /* Additional CDB len */
1091         cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
1092         cmd->cmnd[10] = flags;
1093         put_unaligned_be64(lba, &cmd->cmnd[12]);
1094         put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
1095         put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
1096
1097         return BLK_STS_OK;
1098 }
1099
1100 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1101                                        sector_t lba, unsigned int nr_blocks,
1102                                        unsigned char flags)
1103 {
1104         cmd->cmd_len  = 16;
1105         cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
1106         cmd->cmnd[1]  = flags;
1107         cmd->cmnd[14] = 0;
1108         cmd->cmnd[15] = 0;
1109         put_unaligned_be64(lba, &cmd->cmnd[2]);
1110         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1111
1112         return BLK_STS_OK;
1113 }
1114
1115 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1116                                        sector_t lba, unsigned int nr_blocks,
1117                                        unsigned char flags)
1118 {
1119         cmd->cmd_len = 10;
1120         cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1121         cmd->cmnd[1] = flags;
1122         cmd->cmnd[6] = 0;
1123         cmd->cmnd[9] = 0;
1124         put_unaligned_be32(lba, &cmd->cmnd[2]);
1125         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1126
1127         return BLK_STS_OK;
1128 }
1129
1130 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1131                                       sector_t lba, unsigned int nr_blocks,
1132                                       unsigned char flags)
1133 {
1134         /* Avoid that 0 blocks gets translated into 256 blocks. */
1135         if (WARN_ON_ONCE(nr_blocks == 0))
1136                 return BLK_STS_IOERR;
1137
1138         if (unlikely(flags & 0x8)) {
1139                 /*
1140                  * This happens only if this drive failed 10byte rw
1141                  * command with ILLEGAL_REQUEST during operation and
1142                  * thus turned off use_10_for_rw.
1143                  */
1144                 scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1145                 return BLK_STS_IOERR;
1146         }
1147
1148         cmd->cmd_len = 6;
1149         cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1150         cmd->cmnd[1] = (lba >> 16) & 0x1f;
1151         cmd->cmnd[2] = (lba >> 8) & 0xff;
1152         cmd->cmnd[3] = lba & 0xff;
1153         cmd->cmnd[4] = nr_blocks;
1154         cmd->cmnd[5] = 0;
1155
1156         return BLK_STS_OK;
1157 }
1158
1159 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1160 {
1161         struct request *rq = cmd->request;
1162         struct scsi_device *sdp = cmd->device;
1163         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1164         sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1165         sector_t threshold;
1166         unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1167         unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1168         bool write = rq_data_dir(rq) == WRITE;
1169         unsigned char protect, fua;
1170         blk_status_t ret;
1171         unsigned int dif;
1172         bool dix;
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 (dif || dix)
1214                 protect = sd_setup_protect_cmnd(cmd, dix, dif);
1215         else
1216                 protect = 0;
1217
1218         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1219                 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1220                                          protect | fua);
1221         } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1222                 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1223                                          protect | fua);
1224         } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1225                    sdp->use_10_for_rw || protect) {
1226                 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1227                                          protect | fua);
1228         } else {
1229                 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1230                                         protect | fua);
1231         }
1232
1233         if (unlikely(ret != BLK_STS_OK))
1234                 return ret;
1235
1236         /*
1237          * We shouldn't disconnect in the middle of a sector, so with a dumb
1238          * host adapter, it's safe to assume that we can at least transfer
1239          * this many bytes between each connect / disconnect.
1240          */
1241         cmd->transfersize = sdp->sector_size;
1242         cmd->underflow = nr_blocks << 9;
1243         cmd->allowed = SD_MAX_RETRIES;
1244         cmd->sdb.length = nr_blocks * sdp->sector_size;
1245
1246         SCSI_LOG_HLQUEUE(1,
1247                          scmd_printk(KERN_INFO, cmd,
1248                                      "%s: block=%llu, count=%d\n", __func__,
1249                                      (unsigned long long)blk_rq_pos(rq),
1250                                      blk_rq_sectors(rq)));
1251         SCSI_LOG_HLQUEUE(2,
1252                          scmd_printk(KERN_INFO, cmd,
1253                                      "%s %d/%u 512 byte blocks.\n",
1254                                      write ? "writing" : "reading", nr_blocks,
1255                                      blk_rq_sectors(rq)));
1256
1257         /*
1258          * This indicates that the command is ready from our end to be
1259          * queued.
1260          */
1261         return BLK_STS_OK;
1262 }
1263
1264 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1265 {
1266         struct request *rq = cmd->request;
1267
1268         switch (req_op(rq)) {
1269         case REQ_OP_DISCARD:
1270                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1271                 case SD_LBP_UNMAP:
1272                         return sd_setup_unmap_cmnd(cmd);
1273                 case SD_LBP_WS16:
1274                         return sd_setup_write_same16_cmnd(cmd, true);
1275                 case SD_LBP_WS10:
1276                         return sd_setup_write_same10_cmnd(cmd, true);
1277                 case SD_LBP_ZERO:
1278                         return sd_setup_write_same10_cmnd(cmd, false);
1279                 default:
1280                         return BLK_STS_TARGET;
1281                 }
1282         case REQ_OP_WRITE_ZEROES:
1283                 return sd_setup_write_zeroes_cmnd(cmd);
1284         case REQ_OP_WRITE_SAME:
1285                 return sd_setup_write_same_cmnd(cmd);
1286         case REQ_OP_FLUSH:
1287                 return sd_setup_flush_cmnd(cmd);
1288         case REQ_OP_READ:
1289         case REQ_OP_WRITE:
1290                 return sd_setup_read_write_cmnd(cmd);
1291         case REQ_OP_ZONE_RESET:
1292                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1293                                                    false);
1294         case REQ_OP_ZONE_RESET_ALL:
1295                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1296                                                    true);
1297         case REQ_OP_ZONE_OPEN:
1298                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false);
1299         case REQ_OP_ZONE_CLOSE:
1300                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false);
1301         case REQ_OP_ZONE_FINISH:
1302                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false);
1303         default:
1304                 WARN_ON_ONCE(1);
1305                 return BLK_STS_NOTSUPP;
1306         }
1307 }
1308
1309 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1310 {
1311         struct request *rq = SCpnt->request;
1312         u8 *cmnd;
1313
1314         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1315                 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1316
1317         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1318                 cmnd = SCpnt->cmnd;
1319                 SCpnt->cmnd = NULL;
1320                 SCpnt->cmd_len = 0;
1321                 mempool_free(cmnd, sd_cdb_pool);
1322         }
1323 }
1324
1325 /**
1326  *      sd_open - open a scsi disk device
1327  *      @bdev: Block device of the scsi disk to open
1328  *      @mode: FMODE_* mask
1329  *
1330  *      Returns 0 if successful. Returns a negated errno value in case
1331  *      of error.
1332  *
1333  *      Note: This can be called from a user context (e.g. fsck(1) )
1334  *      or from within the kernel (e.g. as a result of a mount(1) ).
1335  *      In the latter case @inode and @filp carry an abridged amount
1336  *      of information as noted above.
1337  *
1338  *      Locking: called with bdev->bd_mutex held.
1339  **/
1340 static int sd_open(struct block_device *bdev, fmode_t mode)
1341 {
1342         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1343         struct scsi_device *sdev;
1344         int retval;
1345
1346         if (!sdkp)
1347                 return -ENXIO;
1348
1349         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1350
1351         sdev = sdkp->device;
1352
1353         /*
1354          * If the device is in error recovery, wait until it is done.
1355          * If the device is offline, then disallow any access to it.
1356          */
1357         retval = -ENXIO;
1358         if (!scsi_block_when_processing_errors(sdev))
1359                 goto error_out;
1360
1361         if (sdev->removable || sdkp->write_prot)
1362                 check_disk_change(bdev);
1363
1364         /*
1365          * If the drive is empty, just let the open fail.
1366          */
1367         retval = -ENOMEDIUM;
1368         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1369                 goto error_out;
1370
1371         /*
1372          * If the device has the write protect tab set, have the open fail
1373          * if the user expects to be able to write to the thing.
1374          */
1375         retval = -EROFS;
1376         if (sdkp->write_prot && (mode & FMODE_WRITE))
1377                 goto error_out;
1378
1379         /*
1380          * It is possible that the disk changing stuff resulted in
1381          * the device being taken offline.  If this is the case,
1382          * report this to the user, and don't pretend that the
1383          * open actually succeeded.
1384          */
1385         retval = -ENXIO;
1386         if (!scsi_device_online(sdev))
1387                 goto error_out;
1388
1389         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1390                 if (scsi_block_when_processing_errors(sdev))
1391                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1392         }
1393
1394         return 0;
1395
1396 error_out:
1397         scsi_disk_put(sdkp);
1398         return retval;
1399 }
1400
1401 /**
1402  *      sd_release - invoked when the (last) close(2) is called on this
1403  *      scsi disk.
1404  *      @disk: disk to release
1405  *      @mode: FMODE_* mask
1406  *
1407  *      Returns 0.
1408  *
1409  *      Note: may block (uninterruptible) if error recovery is underway
1410  *      on this disk.
1411  *
1412  *      Locking: called with bdev->bd_mutex held.
1413  **/
1414 static void sd_release(struct gendisk *disk, fmode_t mode)
1415 {
1416         struct scsi_disk *sdkp = scsi_disk(disk);
1417         struct scsi_device *sdev = sdkp->device;
1418
1419         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1420
1421         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1422                 if (scsi_block_when_processing_errors(sdev))
1423                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1424         }
1425
1426         scsi_disk_put(sdkp);
1427 }
1428
1429 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1430 {
1431         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1432         struct scsi_device *sdp = sdkp->device;
1433         struct Scsi_Host *host = sdp->host;
1434         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1435         int diskinfo[4];
1436
1437         /* default to most commonly used values */
1438         diskinfo[0] = 0x40;     /* 1 << 6 */
1439         diskinfo[1] = 0x20;     /* 1 << 5 */
1440         diskinfo[2] = capacity >> 11;
1441
1442         /* override with calculated, extended default, or driver values */
1443         if (host->hostt->bios_param)
1444                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1445         else
1446                 scsicam_bios_param(bdev, capacity, diskinfo);
1447
1448         geo->heads = diskinfo[0];
1449         geo->sectors = diskinfo[1];
1450         geo->cylinders = diskinfo[2];
1451         return 0;
1452 }
1453
1454 /**
1455  *      sd_ioctl - process an ioctl
1456  *      @bdev: target block device
1457  *      @mode: FMODE_* mask
1458  *      @cmd: ioctl command number
1459  *      @arg: this is third argument given to ioctl(2) system call.
1460  *      Often contains a pointer.
1461  *
1462  *      Returns 0 if successful (some ioctls return positive numbers on
1463  *      success as well). Returns a negated errno value in case of error.
1464  *
1465  *      Note: most ioctls are forward onto the block subsystem or further
1466  *      down in the scsi subsystem.
1467  **/
1468 static int sd_ioctl_common(struct block_device *bdev, fmode_t mode,
1469                            unsigned int cmd, void __user *p)
1470 {
1471         struct gendisk *disk = bdev->bd_disk;
1472         struct scsi_disk *sdkp = scsi_disk(disk);
1473         struct scsi_device *sdp = sdkp->device;
1474         int error;
1475
1476         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1477                                     "cmd=0x%x\n", disk->disk_name, cmd));
1478
1479         error = scsi_verify_blk_ioctl(bdev, cmd);
1480         if (error < 0)
1481                 return error;
1482
1483         /*
1484          * If we are in the middle of error recovery, don't let anyone
1485          * else try and use this device.  Also, if error recovery fails, it
1486          * may try and take the device offline, in which case all further
1487          * access to the device is prohibited.
1488          */
1489         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1490                         (mode & FMODE_NDELAY) != 0);
1491         if (error)
1492                 goto out;
1493
1494         if (is_sed_ioctl(cmd))
1495                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1496
1497         /*
1498          * Send SCSI addressing ioctls directly to mid level, send other
1499          * ioctls to block level and then onto mid level if they can't be
1500          * resolved.
1501          */
1502         switch (cmd) {
1503                 case SCSI_IOCTL_GET_IDLUN:
1504                 case SCSI_IOCTL_GET_BUS_NUMBER:
1505                         error = scsi_ioctl(sdp, cmd, p);
1506                         break;
1507                 default:
1508                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1509                         break;
1510         }
1511 out:
1512         return error;
1513 }
1514
1515 static void set_media_not_present(struct scsi_disk *sdkp)
1516 {
1517         if (sdkp->media_present)
1518                 sdkp->device->changed = 1;
1519
1520         if (sdkp->device->removable) {
1521                 sdkp->media_present = 0;
1522                 sdkp->capacity = 0;
1523         }
1524 }
1525
1526 static int media_not_present(struct scsi_disk *sdkp,
1527                              struct scsi_sense_hdr *sshdr)
1528 {
1529         if (!scsi_sense_valid(sshdr))
1530                 return 0;
1531
1532         /* not invoked for commands that could return deferred errors */
1533         switch (sshdr->sense_key) {
1534         case UNIT_ATTENTION:
1535         case NOT_READY:
1536                 /* medium not present */
1537                 if (sshdr->asc == 0x3A) {
1538                         set_media_not_present(sdkp);
1539                         return 1;
1540                 }
1541         }
1542         return 0;
1543 }
1544
1545 /**
1546  *      sd_check_events - check media events
1547  *      @disk: kernel device descriptor
1548  *      @clearing: disk events currently being cleared
1549  *
1550  *      Returns mask of DISK_EVENT_*.
1551  *
1552  *      Note: this function is invoked from the block subsystem.
1553  **/
1554 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1555 {
1556         struct scsi_disk *sdkp = scsi_disk_get(disk);
1557         struct scsi_device *sdp;
1558         int retval;
1559
1560         if (!sdkp)
1561                 return 0;
1562
1563         sdp = sdkp->device;
1564         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1565
1566         /*
1567          * If the device is offline, don't send any commands - just pretend as
1568          * if the command failed.  If the device ever comes back online, we
1569          * can deal with it then.  It is only because of unrecoverable errors
1570          * that we would ever take a device offline in the first place.
1571          */
1572         if (!scsi_device_online(sdp)) {
1573                 set_media_not_present(sdkp);
1574                 goto out;
1575         }
1576
1577         /*
1578          * Using TEST_UNIT_READY enables differentiation between drive with
1579          * no cartridge loaded - NOT READY, drive with changed cartridge -
1580          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1581          *
1582          * Drives that auto spin down. eg iomega jaz 1G, will be started
1583          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1584          * sd_revalidate() is called.
1585          */
1586         if (scsi_block_when_processing_errors(sdp)) {
1587                 struct scsi_sense_hdr sshdr = { 0, };
1588
1589                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1590                                               &sshdr);
1591
1592                 /* failed to execute TUR, assume media not present */
1593                 if (host_byte(retval)) {
1594                         set_media_not_present(sdkp);
1595                         goto out;
1596                 }
1597
1598                 if (media_not_present(sdkp, &sshdr))
1599                         goto out;
1600         }
1601
1602         /*
1603          * For removable scsi disk we have to recognise the presence
1604          * of a disk in the drive.
1605          */
1606         if (!sdkp->media_present)
1607                 sdp->changed = 1;
1608         sdkp->media_present = 1;
1609 out:
1610         /*
1611          * sdp->changed is set under the following conditions:
1612          *
1613          *      Medium present state has changed in either direction.
1614          *      Device has indicated UNIT_ATTENTION.
1615          */
1616         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1617         sdp->changed = 0;
1618         scsi_disk_put(sdkp);
1619         return retval;
1620 }
1621
1622 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1623 {
1624         int retries, res;
1625         struct scsi_device *sdp = sdkp->device;
1626         const int timeout = sdp->request_queue->rq_timeout
1627                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1628         struct scsi_sense_hdr my_sshdr;
1629
1630         if (!scsi_device_online(sdp))
1631                 return -ENODEV;
1632
1633         /* caller might not be interested in sense, but we need it */
1634         if (!sshdr)
1635                 sshdr = &my_sshdr;
1636
1637         for (retries = 3; retries > 0; --retries) {
1638                 unsigned char cmd[10] = { 0 };
1639
1640                 cmd[0] = SYNCHRONIZE_CACHE;
1641                 /*
1642                  * Leave the rest of the command zero to indicate
1643                  * flush everything.
1644                  */
1645                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1646                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1647                 if (res == 0)
1648                         break;
1649         }
1650
1651         if (res) {
1652                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1653
1654                 if (driver_byte(res) == DRIVER_SENSE)
1655                         sd_print_sense_hdr(sdkp, sshdr);
1656
1657                 /* we need to evaluate the error return  */
1658                 if (scsi_sense_valid(sshdr) &&
1659                         (sshdr->asc == 0x3a ||  /* medium not present */
1660                          sshdr->asc == 0x20 ||  /* invalid command */
1661                          (sshdr->asc == 0x74 && sshdr->ascq == 0x71)))  /* drive is password locked */
1662                                 /* this is no error here */
1663                                 return 0;
1664
1665                 switch (host_byte(res)) {
1666                 /* ignore errors due to racing a disconnection */
1667                 case DID_BAD_TARGET:
1668                 case DID_NO_CONNECT:
1669                         return 0;
1670                 /* signal the upper layer it might try again */
1671                 case DID_BUS_BUSY:
1672                 case DID_IMM_RETRY:
1673                 case DID_REQUEUE:
1674                 case DID_SOFT_ERROR:
1675                         return -EBUSY;
1676                 default:
1677                         return -EIO;
1678                 }
1679         }
1680         return 0;
1681 }
1682
1683 static void sd_rescan(struct device *dev)
1684 {
1685         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1686
1687         revalidate_disk(sdkp->disk);
1688 }
1689
1690 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1691                     unsigned int cmd, unsigned long arg)
1692 {
1693         void __user *p = (void __user *)arg;
1694         int ret;
1695
1696         ret = sd_ioctl_common(bdev, mode, cmd, p);
1697         if (ret != -ENOTTY)
1698                 return ret;
1699
1700         return scsi_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p);
1701 }
1702
1703 #ifdef CONFIG_COMPAT
1704 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1705                            unsigned int cmd, unsigned long arg)
1706 {
1707         void __user *p = compat_ptr(arg);
1708         int ret;
1709
1710         ret = sd_ioctl_common(bdev, mode, cmd, p);
1711         if (ret != -ENOTTY)
1712                 return ret;
1713
1714         return scsi_compat_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p);
1715 }
1716 #endif
1717
1718 static char sd_pr_type(enum pr_type type)
1719 {
1720         switch (type) {
1721         case PR_WRITE_EXCLUSIVE:
1722                 return 0x01;
1723         case PR_EXCLUSIVE_ACCESS:
1724                 return 0x03;
1725         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1726                 return 0x05;
1727         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1728                 return 0x06;
1729         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1730                 return 0x07;
1731         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1732                 return 0x08;
1733         default:
1734                 return 0;
1735         }
1736 };
1737
1738 static int sd_pr_command(struct block_device *bdev, u8 sa,
1739                 u64 key, u64 sa_key, u8 type, u8 flags)
1740 {
1741         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1742         struct scsi_sense_hdr sshdr;
1743         int result;
1744         u8 cmd[16] = { 0, };
1745         u8 data[24] = { 0, };
1746
1747         cmd[0] = PERSISTENT_RESERVE_OUT;
1748         cmd[1] = sa;
1749         cmd[2] = type;
1750         put_unaligned_be32(sizeof(data), &cmd[5]);
1751
1752         put_unaligned_be64(key, &data[0]);
1753         put_unaligned_be64(sa_key, &data[8]);
1754         data[20] = flags;
1755
1756         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1757                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1758
1759         if (driver_byte(result) == DRIVER_SENSE &&
1760             scsi_sense_valid(&sshdr)) {
1761                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1762                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1763         }
1764
1765         return result;
1766 }
1767
1768 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1769                 u32 flags)
1770 {
1771         if (flags & ~PR_FL_IGNORE_KEY)
1772                 return -EOPNOTSUPP;
1773         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1774                         old_key, new_key, 0,
1775                         (1 << 0) /* APTPL */);
1776 }
1777
1778 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1779                 u32 flags)
1780 {
1781         if (flags)
1782                 return -EOPNOTSUPP;
1783         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1784 }
1785
1786 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1787 {
1788         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1789 }
1790
1791 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1792                 enum pr_type type, bool abort)
1793 {
1794         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1795                              sd_pr_type(type), 0);
1796 }
1797
1798 static int sd_pr_clear(struct block_device *bdev, u64 key)
1799 {
1800         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1801 }
1802
1803 static const struct pr_ops sd_pr_ops = {
1804         .pr_register    = sd_pr_register,
1805         .pr_reserve     = sd_pr_reserve,
1806         .pr_release     = sd_pr_release,
1807         .pr_preempt     = sd_pr_preempt,
1808         .pr_clear       = sd_pr_clear,
1809 };
1810
1811 static const struct block_device_operations sd_fops = {
1812         .owner                  = THIS_MODULE,
1813         .open                   = sd_open,
1814         .release                = sd_release,
1815         .ioctl                  = sd_ioctl,
1816         .getgeo                 = sd_getgeo,
1817 #ifdef CONFIG_COMPAT
1818         .compat_ioctl           = sd_compat_ioctl,
1819 #endif
1820         .check_events           = sd_check_events,
1821         .revalidate_disk        = sd_revalidate_disk,
1822         .unlock_native_capacity = sd_unlock_native_capacity,
1823         .report_zones           = sd_zbc_report_zones,
1824         .pr_ops                 = &sd_pr_ops,
1825 };
1826
1827 /**
1828  *      sd_eh_reset - reset error handling callback
1829  *      @scmd:          sd-issued command that has failed
1830  *
1831  *      This function is called by the SCSI midlayer before starting
1832  *      SCSI EH. When counting medium access failures we have to be
1833  *      careful to register it only only once per device and SCSI EH run;
1834  *      there might be several timed out commands which will cause the
1835  *      'max_medium_access_timeouts' counter to trigger after the first
1836  *      SCSI EH run already and set the device to offline.
1837  *      So this function resets the internal counter before starting SCSI EH.
1838  **/
1839 static void sd_eh_reset(struct scsi_cmnd *scmd)
1840 {
1841         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1842
1843         /* New SCSI EH run, reset gate variable */
1844         sdkp->ignore_medium_access_errors = false;
1845 }
1846
1847 /**
1848  *      sd_eh_action - error handling callback
1849  *      @scmd:          sd-issued command that has failed
1850  *      @eh_disp:       The recovery disposition suggested by the midlayer
1851  *
1852  *      This function is called by the SCSI midlayer upon completion of an
1853  *      error test command (currently TEST UNIT READY). The result of sending
1854  *      the eh command is passed in eh_disp.  We're looking for devices that
1855  *      fail medium access commands but are OK with non access commands like
1856  *      test unit ready (so wrongly see the device as having a successful
1857  *      recovery)
1858  **/
1859 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1860 {
1861         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1862         struct scsi_device *sdev = scmd->device;
1863
1864         if (!scsi_device_online(sdev) ||
1865             !scsi_medium_access_command(scmd) ||
1866             host_byte(scmd->result) != DID_TIME_OUT ||
1867             eh_disp != SUCCESS)
1868                 return eh_disp;
1869
1870         /*
1871          * The device has timed out executing a medium access command.
1872          * However, the TEST UNIT READY command sent during error
1873          * handling completed successfully. Either the device is in the
1874          * process of recovering or has it suffered an internal failure
1875          * that prevents access to the storage medium.
1876          */
1877         if (!sdkp->ignore_medium_access_errors) {
1878                 sdkp->medium_access_timed_out++;
1879                 sdkp->ignore_medium_access_errors = true;
1880         }
1881
1882         /*
1883          * If the device keeps failing read/write commands but TEST UNIT
1884          * READY always completes successfully we assume that medium
1885          * access is no longer possible and take the device offline.
1886          */
1887         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1888                 scmd_printk(KERN_ERR, scmd,
1889                             "Medium access timeout failure. Offlining disk!\n");
1890                 mutex_lock(&sdev->state_mutex);
1891                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1892                 mutex_unlock(&sdev->state_mutex);
1893
1894                 return SUCCESS;
1895         }
1896
1897         return eh_disp;
1898 }
1899
1900 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1901 {
1902         struct request *req = scmd->request;
1903         struct scsi_device *sdev = scmd->device;
1904         unsigned int transferred, good_bytes;
1905         u64 start_lba, end_lba, bad_lba;
1906
1907         /*
1908          * Some commands have a payload smaller than the device logical
1909          * block size (e.g. INQUIRY on a 4K disk).
1910          */
1911         if (scsi_bufflen(scmd) <= sdev->sector_size)
1912                 return 0;
1913
1914         /* Check if we have a 'bad_lba' information */
1915         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1916                                      SCSI_SENSE_BUFFERSIZE,
1917                                      &bad_lba))
1918                 return 0;
1919
1920         /*
1921          * If the bad lba was reported incorrectly, we have no idea where
1922          * the error is.
1923          */
1924         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1925         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1926         if (bad_lba < start_lba || bad_lba >= end_lba)
1927                 return 0;
1928
1929         /*
1930          * resid is optional but mostly filled in.  When it's unused,
1931          * its value is zero, so we assume the whole buffer transferred
1932          */
1933         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1934
1935         /* This computation should always be done in terms of the
1936          * resolution of the device's medium.
1937          */
1938         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1939
1940         return min(good_bytes, transferred);
1941 }
1942
1943 /**
1944  *      sd_done - bottom half handler: called when the lower level
1945  *      driver has completed (successfully or otherwise) a scsi command.
1946  *      @SCpnt: mid-level's per command structure.
1947  *
1948  *      Note: potentially run from within an ISR. Must not block.
1949  **/
1950 static int sd_done(struct scsi_cmnd *SCpnt)
1951 {
1952         int result = SCpnt->result;
1953         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1954         unsigned int sector_size = SCpnt->device->sector_size;
1955         unsigned int resid;
1956         struct scsi_sense_hdr sshdr;
1957         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1958         struct request *req = SCpnt->request;
1959         int sense_valid = 0;
1960         int sense_deferred = 0;
1961
1962         switch (req_op(req)) {
1963         case REQ_OP_DISCARD:
1964         case REQ_OP_WRITE_ZEROES:
1965         case REQ_OP_WRITE_SAME:
1966         case REQ_OP_ZONE_RESET:
1967         case REQ_OP_ZONE_RESET_ALL:
1968         case REQ_OP_ZONE_OPEN:
1969         case REQ_OP_ZONE_CLOSE:
1970         case REQ_OP_ZONE_FINISH:
1971                 if (!result) {
1972                         good_bytes = blk_rq_bytes(req);
1973                         scsi_set_resid(SCpnt, 0);
1974                 } else {
1975                         good_bytes = 0;
1976                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1977                 }
1978                 break;
1979         default:
1980                 /*
1981                  * In case of bogus fw or device, we could end up having
1982                  * an unaligned partial completion. Check this here and force
1983                  * alignment.
1984                  */
1985                 resid = scsi_get_resid(SCpnt);
1986                 if (resid & (sector_size - 1)) {
1987                         sd_printk(KERN_INFO, sdkp,
1988                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1989                                 resid, sector_size);
1990                         scsi_print_command(SCpnt);
1991                         resid = min(scsi_bufflen(SCpnt),
1992                                     round_up(resid, sector_size));
1993                         scsi_set_resid(SCpnt, resid);
1994                 }
1995         }
1996
1997         if (result) {
1998                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1999                 if (sense_valid)
2000                         sense_deferred = scsi_sense_is_deferred(&sshdr);
2001         }
2002         sdkp->medium_access_timed_out = 0;
2003
2004         if (driver_byte(result) != DRIVER_SENSE &&
2005             (!sense_valid || sense_deferred))
2006                 goto out;
2007
2008         switch (sshdr.sense_key) {
2009         case HARDWARE_ERROR:
2010         case MEDIUM_ERROR:
2011                 good_bytes = sd_completed_bytes(SCpnt);
2012                 break;
2013         case RECOVERED_ERROR:
2014                 good_bytes = scsi_bufflen(SCpnt);
2015                 break;
2016         case NO_SENSE:
2017                 /* This indicates a false check condition, so ignore it.  An
2018                  * unknown amount of data was transferred so treat it as an
2019                  * error.
2020                  */
2021                 SCpnt->result = 0;
2022                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2023                 break;
2024         case ABORTED_COMMAND:
2025                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2026                         good_bytes = sd_completed_bytes(SCpnt);
2027                 break;
2028         case ILLEGAL_REQUEST:
2029                 switch (sshdr.asc) {
2030                 case 0x10:      /* DIX: Host detected corruption */
2031                         good_bytes = sd_completed_bytes(SCpnt);
2032                         break;
2033                 case 0x20:      /* INVALID COMMAND OPCODE */
2034                 case 0x24:      /* INVALID FIELD IN CDB */
2035                         switch (SCpnt->cmnd[0]) {
2036                         case UNMAP:
2037                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2038                                 break;
2039                         case WRITE_SAME_16:
2040                         case WRITE_SAME:
2041                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2042                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2043                                 } else {
2044                                         sdkp->device->no_write_same = 1;
2045                                         sd_config_write_same(sdkp);
2046                                         req->rq_flags |= RQF_QUIET;
2047                                 }
2048                                 break;
2049                         }
2050                 }
2051                 break;
2052         default:
2053                 break;
2054         }
2055
2056  out:
2057         if (sd_is_zoned(sdkp))
2058                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2059
2060         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2061                                            "sd_done: completed %d of %d bytes\n",
2062                                            good_bytes, scsi_bufflen(SCpnt)));
2063
2064         return good_bytes;
2065 }
2066
2067 /*
2068  * spinup disk - called only in sd_revalidate_disk()
2069  */
2070 static void
2071 sd_spinup_disk(struct scsi_disk *sdkp)
2072 {
2073         unsigned char cmd[10];
2074         unsigned long spintime_expire = 0;
2075         int retries, spintime;
2076         unsigned int the_result;
2077         struct scsi_sense_hdr sshdr;
2078         int sense_valid = 0;
2079
2080         spintime = 0;
2081
2082         /* Spin up drives, as required.  Only do this at boot time */
2083         /* Spinup needs to be done for module loads too. */
2084         do {
2085                 retries = 0;
2086
2087                 do {
2088                         cmd[0] = TEST_UNIT_READY;
2089                         memset((void *) &cmd[1], 0, 9);
2090
2091                         the_result = scsi_execute_req(sdkp->device, cmd,
2092                                                       DMA_NONE, NULL, 0,
2093                                                       &sshdr, SD_TIMEOUT,
2094                                                       SD_MAX_RETRIES, NULL);
2095
2096                         /*
2097                          * If the drive has indicated to us that it
2098                          * doesn't have any media in it, don't bother
2099                          * with any more polling.
2100                          */
2101                         if (media_not_present(sdkp, &sshdr))
2102                                 return;
2103
2104                         if (the_result)
2105                                 sense_valid = scsi_sense_valid(&sshdr);
2106                         retries++;
2107                 } while (retries < 3 &&
2108                          (!scsi_status_is_good(the_result) ||
2109                           ((driver_byte(the_result) == DRIVER_SENSE) &&
2110                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2111
2112                 if (driver_byte(the_result) != DRIVER_SENSE) {
2113                         /* no sense, TUR either succeeded or failed
2114                          * with a status error */
2115                         if(!spintime && !scsi_status_is_good(the_result)) {
2116                                 sd_print_result(sdkp, "Test Unit Ready failed",
2117                                                 the_result);
2118                         }
2119                         break;
2120                 }
2121
2122                 /*
2123                  * The device does not want the automatic start to be issued.
2124                  */
2125                 if (sdkp->device->no_start_on_add)
2126                         break;
2127
2128                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2129                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2130                                 break;  /* manual intervention required */
2131                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2132                                 break;  /* standby */
2133                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2134                                 break;  /* unavailable */
2135                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2136                                 break;  /* sanitize in progress */
2137                         /*
2138                          * Issue command to spin up drive when not ready
2139                          */
2140                         if (!spintime) {
2141                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2142                                 cmd[0] = START_STOP;
2143                                 cmd[1] = 1;     /* Return immediately */
2144                                 memset((void *) &cmd[2], 0, 8);
2145                                 cmd[4] = 1;     /* Start spin cycle */
2146                                 if (sdkp->device->start_stop_pwr_cond)
2147                                         cmd[4] |= 1 << 4;
2148                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2149                                                  NULL, 0, &sshdr,
2150                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2151                                                  NULL);
2152                                 spintime_expire = jiffies + 100 * HZ;
2153                                 spintime = 1;
2154                         }
2155                         /* Wait 1 second for next try */
2156                         msleep(1000);
2157                         printk(KERN_CONT ".");
2158
2159                 /*
2160                  * Wait for USB flash devices with slow firmware.
2161                  * Yes, this sense key/ASC combination shouldn't
2162                  * occur here.  It's characteristic of these devices.
2163                  */
2164                 } else if (sense_valid &&
2165                                 sshdr.sense_key == UNIT_ATTENTION &&
2166                                 sshdr.asc == 0x28) {
2167                         if (!spintime) {
2168                                 spintime_expire = jiffies + 5 * HZ;
2169                                 spintime = 1;
2170                         }
2171                         /* Wait 1 second for next try */
2172                         msleep(1000);
2173                 } else {
2174                         /* we don't understand the sense code, so it's
2175                          * probably pointless to loop */
2176                         if(!spintime) {
2177                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2178                                 sd_print_sense_hdr(sdkp, &sshdr);
2179                         }
2180                         break;
2181                 }
2182
2183         } while (spintime && time_before_eq(jiffies, spintime_expire));
2184
2185         if (spintime) {
2186                 if (scsi_status_is_good(the_result))
2187                         printk(KERN_CONT "ready\n");
2188                 else
2189                         printk(KERN_CONT "not responding...\n");
2190         }
2191 }
2192
2193 /*
2194  * Determine whether disk supports Data Integrity Field.
2195  */
2196 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2197 {
2198         struct scsi_device *sdp = sdkp->device;
2199         u8 type;
2200         int ret = 0;
2201
2202         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) {
2203                 sdkp->protection_type = 0;
2204                 return ret;
2205         }
2206
2207         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2208
2209         if (type > T10_PI_TYPE3_PROTECTION)
2210                 ret = -ENODEV;
2211         else if (scsi_host_dif_capable(sdp->host, type))
2212                 ret = 1;
2213
2214         if (sdkp->first_scan || type != sdkp->protection_type)
2215                 switch (ret) {
2216                 case -ENODEV:
2217                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2218                                   " protection type %u. Disabling disk!\n",
2219                                   type);
2220                         break;
2221                 case 1:
2222                         sd_printk(KERN_NOTICE, sdkp,
2223                                   "Enabling DIF Type %u protection\n", type);
2224                         break;
2225                 case 0:
2226                         sd_printk(KERN_NOTICE, sdkp,
2227                                   "Disabling DIF Type %u protection\n", type);
2228                         break;
2229                 }
2230
2231         sdkp->protection_type = type;
2232
2233         return ret;
2234 }
2235
2236 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2237                         struct scsi_sense_hdr *sshdr, int sense_valid,
2238                         int the_result)
2239 {
2240         if (driver_byte(the_result) == DRIVER_SENSE)
2241                 sd_print_sense_hdr(sdkp, sshdr);
2242         else
2243                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2244
2245         /*
2246          * Set dirty bit for removable devices if not ready -
2247          * sometimes drives will not report this properly.
2248          */
2249         if (sdp->removable &&
2250             sense_valid && sshdr->sense_key == NOT_READY)
2251                 set_media_not_present(sdkp);
2252
2253         /*
2254          * We used to set media_present to 0 here to indicate no media
2255          * in the drive, but some drives fail read capacity even with
2256          * media present, so we can't do that.
2257          */
2258         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2259 }
2260
2261 #define RC16_LEN 32
2262 #if RC16_LEN > SD_BUF_SIZE
2263 #error RC16_LEN must not be more than SD_BUF_SIZE
2264 #endif
2265
2266 #define READ_CAPACITY_RETRIES_ON_RESET  10
2267
2268 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2269                                                 unsigned char *buffer)
2270 {
2271         unsigned char cmd[16];
2272         struct scsi_sense_hdr sshdr;
2273         int sense_valid = 0;
2274         int the_result;
2275         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2276         unsigned int alignment;
2277         unsigned long long lba;
2278         unsigned sector_size;
2279
2280         if (sdp->no_read_capacity_16)
2281                 return -EINVAL;
2282
2283         do {
2284                 memset(cmd, 0, 16);
2285                 cmd[0] = SERVICE_ACTION_IN_16;
2286                 cmd[1] = SAI_READ_CAPACITY_16;
2287                 cmd[13] = RC16_LEN;
2288                 memset(buffer, 0, RC16_LEN);
2289
2290                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2291                                         buffer, RC16_LEN, &sshdr,
2292                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2293
2294                 if (media_not_present(sdkp, &sshdr))
2295                         return -ENODEV;
2296
2297                 if (the_result) {
2298                         sense_valid = scsi_sense_valid(&sshdr);
2299                         if (sense_valid &&
2300                             sshdr.sense_key == ILLEGAL_REQUEST &&
2301                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2302                             sshdr.ascq == 0x00)
2303                                 /* Invalid Command Operation Code or
2304                                  * Invalid Field in CDB, just retry
2305                                  * silently with RC10 */
2306                                 return -EINVAL;
2307                         if (sense_valid &&
2308                             sshdr.sense_key == UNIT_ATTENTION &&
2309                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2310                                 /* Device reset might occur several times,
2311                                  * give it one more chance */
2312                                 if (--reset_retries > 0)
2313                                         continue;
2314                 }
2315                 retries--;
2316
2317         } while (the_result && retries);
2318
2319         if (the_result) {
2320                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2321                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2322                 return -EINVAL;
2323         }
2324
2325         sector_size = get_unaligned_be32(&buffer[8]);
2326         lba = get_unaligned_be64(&buffer[0]);
2327
2328         if (sd_read_protection_type(sdkp, buffer) < 0) {
2329                 sdkp->capacity = 0;
2330                 return -ENODEV;
2331         }
2332
2333         /* Logical blocks per physical block exponent */
2334         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2335
2336         /* RC basis */
2337         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2338
2339         /* Lowest aligned logical block */
2340         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2341         blk_queue_alignment_offset(sdp->request_queue, alignment);
2342         if (alignment && sdkp->first_scan)
2343                 sd_printk(KERN_NOTICE, sdkp,
2344                           "physical block alignment offset: %u\n", alignment);
2345
2346         if (buffer[14] & 0x80) { /* LBPME */
2347                 sdkp->lbpme = 1;
2348
2349                 if (buffer[14] & 0x40) /* LBPRZ */
2350                         sdkp->lbprz = 1;
2351
2352                 sd_config_discard(sdkp, SD_LBP_WS16);
2353         }
2354
2355         sdkp->capacity = lba + 1;
2356         return sector_size;
2357 }
2358
2359 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2360                                                 unsigned char *buffer)
2361 {
2362         unsigned char cmd[16];
2363         struct scsi_sense_hdr sshdr;
2364         int sense_valid = 0;
2365         int the_result;
2366         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2367         sector_t lba;
2368         unsigned sector_size;
2369
2370         do {
2371                 cmd[0] = READ_CAPACITY;
2372                 memset(&cmd[1], 0, 9);
2373                 memset(buffer, 0, 8);
2374
2375                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2376                                         buffer, 8, &sshdr,
2377                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2378
2379                 if (media_not_present(sdkp, &sshdr))
2380                         return -ENODEV;
2381
2382                 if (the_result) {
2383                         sense_valid = scsi_sense_valid(&sshdr);
2384                         if (sense_valid &&
2385                             sshdr.sense_key == UNIT_ATTENTION &&
2386                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2387                                 /* Device reset might occur several times,
2388                                  * give it one more chance */
2389                                 if (--reset_retries > 0)
2390                                         continue;
2391                 }
2392                 retries--;
2393
2394         } while (the_result && retries);
2395
2396         if (the_result) {
2397                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2398                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2399                 return -EINVAL;
2400         }
2401
2402         sector_size = get_unaligned_be32(&buffer[4]);
2403         lba = get_unaligned_be32(&buffer[0]);
2404
2405         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2406                 /* Some buggy (usb cardreader) devices return an lba of
2407                    0xffffffff when the want to report a size of 0 (with
2408                    which they really mean no media is present) */
2409                 sdkp->capacity = 0;
2410                 sdkp->physical_block_size = sector_size;
2411                 return sector_size;
2412         }
2413
2414         sdkp->capacity = lba + 1;
2415         sdkp->physical_block_size = sector_size;
2416         return sector_size;
2417 }
2418
2419 static int sd_try_rc16_first(struct scsi_device *sdp)
2420 {
2421         if (sdp->host->max_cmd_len < 16)
2422                 return 0;
2423         if (sdp->try_rc_10_first)
2424                 return 0;
2425         if (sdp->scsi_level > SCSI_SPC_2)
2426                 return 1;
2427         if (scsi_device_protection(sdp))
2428                 return 1;
2429         return 0;
2430 }
2431
2432 /*
2433  * read disk capacity
2434  */
2435 static void
2436 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2437 {
2438         int sector_size;
2439         struct scsi_device *sdp = sdkp->device;
2440
2441         if (sd_try_rc16_first(sdp)) {
2442                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2443                 if (sector_size == -EOVERFLOW)
2444                         goto got_data;
2445                 if (sector_size == -ENODEV)
2446                         return;
2447                 if (sector_size < 0)
2448                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2449                 if (sector_size < 0)
2450                         return;
2451         } else {
2452                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2453                 if (sector_size == -EOVERFLOW)
2454                         goto got_data;
2455                 if (sector_size < 0)
2456                         return;
2457                 if ((sizeof(sdkp->capacity) > 4) &&
2458                     (sdkp->capacity > 0xffffffffULL)) {
2459                         int old_sector_size = sector_size;
2460                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2461                                         "Trying to use READ CAPACITY(16).\n");
2462                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2463                         if (sector_size < 0) {
2464                                 sd_printk(KERN_NOTICE, sdkp,
2465                                         "Using 0xffffffff as device size\n");
2466                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2467                                 sector_size = old_sector_size;
2468                                 goto got_data;
2469                         }
2470                         /* Remember that READ CAPACITY(16) succeeded */
2471                         sdp->try_rc_10_first = 0;
2472                 }
2473         }
2474
2475         /* Some devices are known to return the total number of blocks,
2476          * not the highest block number.  Some devices have versions
2477          * which do this and others which do not.  Some devices we might
2478          * suspect of doing this but we don't know for certain.
2479          *
2480          * If we know the reported capacity is wrong, decrement it.  If
2481          * we can only guess, then assume the number of blocks is even
2482          * (usually true but not always) and err on the side of lowering
2483          * the capacity.
2484          */
2485         if (sdp->fix_capacity ||
2486             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2487                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2488                                 "from its reported value: %llu\n",
2489                                 (unsigned long long) sdkp->capacity);
2490                 --sdkp->capacity;
2491         }
2492
2493 got_data:
2494         if (sector_size == 0) {
2495                 sector_size = 512;
2496                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2497                           "assuming 512.\n");
2498         }
2499
2500         if (sector_size != 512 &&
2501             sector_size != 1024 &&
2502             sector_size != 2048 &&
2503             sector_size != 4096) {
2504                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2505                           sector_size);
2506                 /*
2507                  * The user might want to re-format the drive with
2508                  * a supported sectorsize.  Once this happens, it
2509                  * would be relatively trivial to set the thing up.
2510                  * For this reason, we leave the thing in the table.
2511                  */
2512                 sdkp->capacity = 0;
2513                 /*
2514                  * set a bogus sector size so the normal read/write
2515                  * logic in the block layer will eventually refuse any
2516                  * request on this device without tripping over power
2517                  * of two sector size assumptions
2518                  */
2519                 sector_size = 512;
2520         }
2521         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2522         blk_queue_physical_block_size(sdp->request_queue,
2523                                       sdkp->physical_block_size);
2524         sdkp->device->sector_size = sector_size;
2525
2526         if (sdkp->capacity > 0xffffffff)
2527                 sdp->use_16_for_rw = 1;
2528
2529 }
2530
2531 /*
2532  * Print disk capacity
2533  */
2534 static void
2535 sd_print_capacity(struct scsi_disk *sdkp,
2536                   sector_t old_capacity)
2537 {
2538         int sector_size = sdkp->device->sector_size;
2539         char cap_str_2[10], cap_str_10[10];
2540
2541         if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2542                 return;
2543
2544         string_get_size(sdkp->capacity, sector_size,
2545                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2546         string_get_size(sdkp->capacity, sector_size,
2547                         STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
2548
2549         sd_printk(KERN_NOTICE, sdkp,
2550                   "%llu %d-byte logical blocks: (%s/%s)\n",
2551                   (unsigned long long)sdkp->capacity,
2552                   sector_size, cap_str_10, cap_str_2);
2553
2554         if (sdkp->physical_block_size != sector_size)
2555                 sd_printk(KERN_NOTICE, sdkp,
2556                           "%u-byte physical blocks\n",
2557                           sdkp->physical_block_size);
2558
2559         sd_zbc_print_zones(sdkp);
2560 }
2561
2562 /* called with buffer of length 512 */
2563 static inline int
2564 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2565                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2566                  struct scsi_sense_hdr *sshdr)
2567 {
2568         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2569                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2570                                sshdr);
2571 }
2572
2573 /*
2574  * read write protect setting, if possible - called only in sd_revalidate_disk()
2575  * called with buffer of length SD_BUF_SIZE
2576  */
2577 static void
2578 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2579 {
2580         int res;
2581         struct scsi_device *sdp = sdkp->device;
2582         struct scsi_mode_data data;
2583         int old_wp = sdkp->write_prot;
2584
2585         set_disk_ro(sdkp->disk, 0);
2586         if (sdp->skip_ms_page_3f) {
2587                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2588                 return;
2589         }
2590
2591         if (sdp->use_192_bytes_for_3f) {
2592                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2593         } else {
2594                 /*
2595                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2596                  * We have to start carefully: some devices hang if we ask
2597                  * for more than is available.
2598                  */
2599                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2600
2601                 /*
2602                  * Second attempt: ask for page 0 When only page 0 is
2603                  * implemented, a request for page 3F may return Sense Key
2604                  * 5: Illegal Request, Sense Code 24: Invalid field in
2605                  * CDB.
2606                  */
2607                 if (!scsi_status_is_good(res))
2608                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2609
2610                 /*
2611                  * Third attempt: ask 255 bytes, as we did earlier.
2612                  */
2613                 if (!scsi_status_is_good(res))
2614                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2615                                                &data, NULL);
2616         }
2617
2618         if (!scsi_status_is_good(res)) {
2619                 sd_first_printk(KERN_WARNING, sdkp,
2620                           "Test WP failed, assume Write Enabled\n");
2621         } else {
2622                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2623                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2624                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2625                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2626                                   sdkp->write_prot ? "on" : "off");
2627                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2628                 }
2629         }
2630 }
2631
2632 /*
2633  * sd_read_cache_type - called only from sd_revalidate_disk()
2634  * called with buffer of length SD_BUF_SIZE
2635  */
2636 static void
2637 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2638 {
2639         int len = 0, res;
2640         struct scsi_device *sdp = sdkp->device;
2641
2642         int dbd;
2643         int modepage;
2644         int first_len;
2645         struct scsi_mode_data data;
2646         struct scsi_sense_hdr sshdr;
2647         int old_wce = sdkp->WCE;
2648         int old_rcd = sdkp->RCD;
2649         int old_dpofua = sdkp->DPOFUA;
2650
2651
2652         if (sdkp->cache_override)
2653                 return;
2654
2655         first_len = 4;
2656         if (sdp->skip_ms_page_8) {
2657                 if (sdp->type == TYPE_RBC)
2658                         goto defaults;
2659                 else {
2660                         if (sdp->skip_ms_page_3f)
2661                                 goto defaults;
2662                         modepage = 0x3F;
2663                         if (sdp->use_192_bytes_for_3f)
2664                                 first_len = 192;
2665                         dbd = 0;
2666                 }
2667         } else if (sdp->type == TYPE_RBC) {
2668                 modepage = 6;
2669                 dbd = 8;
2670         } else {
2671                 modepage = 8;
2672                 dbd = 0;
2673         }
2674
2675         /* cautiously ask */
2676         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2677                         &data, &sshdr);
2678
2679         if (!scsi_status_is_good(res))
2680                 goto bad_sense;
2681
2682         if (!data.header_length) {
2683                 modepage = 6;
2684                 first_len = 0;
2685                 sd_first_printk(KERN_ERR, sdkp,
2686                                 "Missing header in MODE_SENSE response\n");
2687         }
2688
2689         /* that went OK, now ask for the proper length */
2690         len = data.length;
2691
2692         /*
2693          * We're only interested in the first three bytes, actually.
2694          * But the data cache page is defined for the first 20.
2695          */
2696         if (len < 3)
2697                 goto bad_sense;
2698         else if (len > SD_BUF_SIZE) {
2699                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2700                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2701                 len = SD_BUF_SIZE;
2702         }
2703         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2704                 len = 192;
2705
2706         /* Get the data */
2707         if (len > first_len)
2708                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2709                                 &data, &sshdr);
2710
2711         if (scsi_status_is_good(res)) {
2712                 int offset = data.header_length + data.block_descriptor_length;
2713
2714                 while (offset < len) {
2715                         u8 page_code = buffer[offset] & 0x3F;
2716                         u8 spf       = buffer[offset] & 0x40;
2717
2718                         if (page_code == 8 || page_code == 6) {
2719                                 /* We're interested only in the first 3 bytes.
2720                                  */
2721                                 if (len - offset <= 2) {
2722                                         sd_first_printk(KERN_ERR, sdkp,
2723                                                 "Incomplete mode parameter "
2724                                                         "data\n");
2725                                         goto defaults;
2726                                 } else {
2727                                         modepage = page_code;
2728                                         goto Page_found;
2729                                 }
2730                         } else {
2731                                 /* Go to the next page */
2732                                 if (spf && len - offset > 3)
2733                                         offset += 4 + (buffer[offset+2] << 8) +
2734                                                 buffer[offset+3];
2735                                 else if (!spf && len - offset > 1)
2736                                         offset += 2 + buffer[offset+1];
2737                                 else {
2738                                         sd_first_printk(KERN_ERR, sdkp,
2739                                                         "Incomplete mode "
2740                                                         "parameter data\n");
2741                                         goto defaults;
2742                                 }
2743                         }
2744                 }
2745
2746                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2747                 goto defaults;
2748
2749         Page_found:
2750                 if (modepage == 8) {
2751                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2752                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2753                 } else {
2754                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2755                         sdkp->RCD = 0;
2756                 }
2757
2758                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2759                 if (sdp->broken_fua) {
2760                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2761                         sdkp->DPOFUA = 0;
2762                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2763                            !sdkp->device->use_16_for_rw) {
2764                         sd_first_printk(KERN_NOTICE, sdkp,
2765                                   "Uses READ/WRITE(6), disabling FUA\n");
2766                         sdkp->DPOFUA = 0;
2767                 }
2768
2769                 /* No cache flush allowed for write protected devices */
2770                 if (sdkp->WCE && sdkp->write_prot)
2771                         sdkp->WCE = 0;
2772
2773                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2774                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2775                         sd_printk(KERN_NOTICE, sdkp,
2776                                   "Write cache: %s, read cache: %s, %s\n",
2777                                   sdkp->WCE ? "enabled" : "disabled",
2778                                   sdkp->RCD ? "disabled" : "enabled",
2779                                   sdkp->DPOFUA ? "supports DPO and FUA"
2780                                   : "doesn't support DPO or FUA");
2781
2782                 return;
2783         }
2784
2785 bad_sense:
2786         if (scsi_sense_valid(&sshdr) &&
2787             sshdr.sense_key == ILLEGAL_REQUEST &&
2788             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2789                 /* Invalid field in CDB */
2790                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2791         else
2792                 sd_first_printk(KERN_ERR, sdkp,
2793                                 "Asking for cache data failed\n");
2794
2795 defaults:
2796         if (sdp->wce_default_on) {
2797                 sd_first_printk(KERN_NOTICE, sdkp,
2798                                 "Assuming drive cache: write back\n");
2799                 sdkp->WCE = 1;
2800         } else {
2801                 sd_first_printk(KERN_ERR, sdkp,
2802                                 "Assuming drive cache: write through\n");
2803                 sdkp->WCE = 0;
2804         }
2805         sdkp->RCD = 0;
2806         sdkp->DPOFUA = 0;
2807 }
2808
2809 /*
2810  * The ATO bit indicates whether the DIF application tag is available
2811  * for use by the operating system.
2812  */
2813 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2814 {
2815         int res, offset;
2816         struct scsi_device *sdp = sdkp->device;
2817         struct scsi_mode_data data;
2818         struct scsi_sense_hdr sshdr;
2819
2820         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2821                 return;
2822
2823         if (sdkp->protection_type == 0)
2824                 return;
2825
2826         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2827                               SD_MAX_RETRIES, &data, &sshdr);
2828
2829         if (!scsi_status_is_good(res) || !data.header_length ||
2830             data.length < 6) {
2831                 sd_first_printk(KERN_WARNING, sdkp,
2832                           "getting Control mode page failed, assume no ATO\n");
2833
2834                 if (scsi_sense_valid(&sshdr))
2835                         sd_print_sense_hdr(sdkp, &sshdr);
2836
2837                 return;
2838         }
2839
2840         offset = data.header_length + data.block_descriptor_length;
2841
2842         if ((buffer[offset] & 0x3f) != 0x0a) {
2843                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2844                 return;
2845         }
2846
2847         if ((buffer[offset + 5] & 0x80) == 0)
2848                 return;
2849
2850         sdkp->ATO = 1;
2851
2852         return;
2853 }
2854
2855 /**
2856  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2857  * @sdkp: disk to query
2858  */
2859 static void sd_read_block_limits(struct scsi_disk *sdkp)
2860 {
2861         unsigned int sector_sz = sdkp->device->sector_size;
2862         const int vpd_len = 64;
2863         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2864
2865         if (!buffer ||
2866             /* Block Limits VPD */
2867             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2868                 goto out;
2869
2870         blk_queue_io_min(sdkp->disk->queue,
2871                          get_unaligned_be16(&buffer[6]) * sector_sz);
2872
2873         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2874         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2875
2876         if (buffer[3] == 0x3c) {
2877                 unsigned int lba_count, desc_count;
2878
2879                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2880
2881                 if (!sdkp->lbpme)
2882                         goto out;
2883
2884                 lba_count = get_unaligned_be32(&buffer[20]);
2885                 desc_count = get_unaligned_be32(&buffer[24]);
2886
2887                 if (lba_count && desc_count)
2888                         sdkp->max_unmap_blocks = lba_count;
2889
2890                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2891
2892                 if (buffer[32] & 0x80)
2893                         sdkp->unmap_alignment =
2894                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2895
2896                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2897
2898                         if (sdkp->max_unmap_blocks)
2899                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2900                         else
2901                                 sd_config_discard(sdkp, SD_LBP_WS16);
2902
2903                 } else {        /* LBP VPD page tells us what to use */
2904                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2905                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2906                         else if (sdkp->lbpws)
2907                                 sd_config_discard(sdkp, SD_LBP_WS16);
2908                         else if (sdkp->lbpws10)
2909                                 sd_config_discard(sdkp, SD_LBP_WS10);
2910                         else
2911                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2912                 }
2913         }
2914
2915  out:
2916         kfree(buffer);
2917 }
2918
2919 /**
2920  * sd_read_block_characteristics - Query block dev. characteristics
2921  * @sdkp: disk to query
2922  */
2923 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2924 {
2925         struct request_queue *q = sdkp->disk->queue;
2926         unsigned char *buffer;
2927         u16 rot;
2928         const int vpd_len = 64;
2929
2930         buffer = kmalloc(vpd_len, GFP_KERNEL);
2931
2932         if (!buffer ||
2933             /* Block Device Characteristics VPD */
2934             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2935                 goto out;
2936
2937         rot = get_unaligned_be16(&buffer[4]);
2938
2939         if (rot == 1) {
2940                 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2941                 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2942         }
2943
2944         if (sdkp->device->type == TYPE_ZBC) {
2945                 /* Host-managed */
2946                 q->limits.zoned = BLK_ZONED_HM;
2947         } else {
2948                 sdkp->zoned = (buffer[8] >> 4) & 3;
2949                 if (sdkp->zoned == 1 && !disk_has_partitions(sdkp->disk)) {
2950                         /* Host-aware */
2951                         q->limits.zoned = BLK_ZONED_HA;
2952                 } else {
2953                         /*
2954                          * Treat drive-managed devices and host-aware devices
2955                          * with partitions as regular block devices.
2956                          */
2957                         q->limits.zoned = BLK_ZONED_NONE;
2958                 }
2959         }
2960         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2961                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2962                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2963
2964  out:
2965         kfree(buffer);
2966 }
2967
2968 /**
2969  * sd_read_block_provisioning - Query provisioning VPD page
2970  * @sdkp: disk to query
2971  */
2972 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2973 {
2974         unsigned char *buffer;
2975         const int vpd_len = 8;
2976
2977         if (sdkp->lbpme == 0)
2978                 return;
2979
2980         buffer = kmalloc(vpd_len, GFP_KERNEL);
2981
2982         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2983                 goto out;
2984
2985         sdkp->lbpvpd    = 1;
2986         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2987         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2988         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2989
2990  out:
2991         kfree(buffer);
2992 }
2993
2994 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2995 {
2996         struct scsi_device *sdev = sdkp->device;
2997
2998         if (sdev->host->no_write_same) {
2999                 sdev->no_write_same = 1;
3000
3001                 return;
3002         }
3003
3004         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
3005                 /* too large values might cause issues with arcmsr */
3006                 int vpd_buf_len = 64;
3007
3008                 sdev->no_report_opcodes = 1;
3009
3010                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3011                  * CODES is unsupported and the device has an ATA
3012                  * Information VPD page (SAT).
3013                  */
3014                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3015                         sdev->no_write_same = 1;
3016         }
3017
3018         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3019                 sdkp->ws16 = 1;
3020
3021         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3022                 sdkp->ws10 = 1;
3023 }
3024
3025 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3026 {
3027         struct scsi_device *sdev = sdkp->device;
3028
3029         if (!sdev->security_supported)
3030                 return;
3031
3032         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3033                         SECURITY_PROTOCOL_IN) == 1 &&
3034             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3035                         SECURITY_PROTOCOL_OUT) == 1)
3036                 sdkp->security = 1;
3037 }
3038
3039 /*
3040  * Determine the device's preferred I/O size for reads and writes
3041  * unless the reported value is unreasonably small, large, not a
3042  * multiple of the physical block size, or simply garbage.
3043  */
3044 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3045                                       unsigned int dev_max)
3046 {
3047         struct scsi_device *sdp = sdkp->device;
3048         unsigned int opt_xfer_bytes =
3049                 logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3050
3051         if (sdkp->opt_xfer_blocks == 0)
3052                 return false;
3053
3054         if (sdkp->opt_xfer_blocks > dev_max) {
3055                 sd_first_printk(KERN_WARNING, sdkp,
3056                                 "Optimal transfer size %u logical blocks " \
3057                                 "> dev_max (%u logical blocks)\n",
3058                                 sdkp->opt_xfer_blocks, dev_max);
3059                 return false;
3060         }
3061
3062         if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3063                 sd_first_printk(KERN_WARNING, sdkp,
3064                                 "Optimal transfer size %u logical blocks " \
3065                                 "> sd driver limit (%u logical blocks)\n",
3066                                 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3067                 return false;
3068         }
3069
3070         if (opt_xfer_bytes < PAGE_SIZE) {
3071                 sd_first_printk(KERN_WARNING, sdkp,
3072                                 "Optimal transfer size %u bytes < " \
3073                                 "PAGE_SIZE (%u bytes)\n",
3074                                 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3075                 return false;
3076         }
3077
3078         if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3079                 sd_first_printk(KERN_WARNING, sdkp,
3080                                 "Optimal transfer size %u bytes not a " \
3081                                 "multiple of physical block size (%u bytes)\n",
3082                                 opt_xfer_bytes, sdkp->physical_block_size);
3083                 return false;
3084         }
3085
3086         sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3087                         opt_xfer_bytes);
3088         return true;
3089 }
3090
3091 /**
3092  *      sd_revalidate_disk - called the first time a new disk is seen,
3093  *      performs disk spin up, read_capacity, etc.
3094  *      @disk: struct gendisk we care about
3095  **/
3096 static int sd_revalidate_disk(struct gendisk *disk)
3097 {
3098         struct scsi_disk *sdkp = scsi_disk(disk);
3099         struct scsi_device *sdp = sdkp->device;
3100         struct request_queue *q = sdkp->disk->queue;
3101         sector_t old_capacity = sdkp->capacity;
3102         unsigned char *buffer;
3103         unsigned int dev_max, rw_max;
3104
3105         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3106                                       "sd_revalidate_disk\n"));
3107
3108         /*
3109          * If the device is offline, don't try and read capacity or any
3110          * of the other niceties.
3111          */
3112         if (!scsi_device_online(sdp))
3113                 goto out;
3114
3115         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3116         if (!buffer) {
3117                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3118                           "allocation failure.\n");
3119                 goto out;
3120         }
3121
3122         sd_spinup_disk(sdkp);
3123
3124         /*
3125          * Without media there is no reason to ask; moreover, some devices
3126          * react badly if we do.
3127          */
3128         if (sdkp->media_present) {
3129                 sd_read_capacity(sdkp, buffer);
3130
3131                 /*
3132                  * set the default to rotational.  All non-rotational devices
3133                  * support the block characteristics VPD page, which will
3134                  * cause this to be updated correctly and any device which
3135                  * doesn't support it should be treated as rotational.
3136                  */
3137                 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
3138                 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
3139
3140                 if (scsi_device_supports_vpd(sdp)) {
3141                         sd_read_block_provisioning(sdkp);
3142                         sd_read_block_limits(sdkp);
3143                         sd_read_block_characteristics(sdkp);
3144                         sd_zbc_read_zones(sdkp, buffer);
3145                 }
3146
3147                 sd_print_capacity(sdkp, old_capacity);
3148
3149                 sd_read_write_protect_flag(sdkp, buffer);
3150                 sd_read_cache_type(sdkp, buffer);
3151                 sd_read_app_tag_own(sdkp, buffer);
3152                 sd_read_write_same(sdkp, buffer);
3153                 sd_read_security(sdkp, buffer);
3154         }
3155
3156         /*
3157          * We now have all cache related info, determine how we deal
3158          * with flush requests.
3159          */
3160         sd_set_flush_flag(sdkp);
3161
3162         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3163         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3164
3165         /* Some devices report a maximum block count for READ/WRITE requests. */
3166         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3167         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3168
3169         if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3170                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3171                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3172         } else
3173                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3174                                       (sector_t)BLK_DEF_MAX_SECTORS);
3175
3176         /* Do not exceed controller limit */
3177         rw_max = min(rw_max, queue_max_hw_sectors(q));
3178
3179         /*
3180          * Only update max_sectors if previously unset or if the current value
3181          * exceeds the capabilities of the hardware.
3182          */
3183         if (sdkp->first_scan ||
3184             q->limits.max_sectors > q->limits.max_dev_sectors ||
3185             q->limits.max_sectors > q->limits.max_hw_sectors)
3186                 q->limits.max_sectors = rw_max;
3187
3188         sdkp->first_scan = 0;
3189
3190         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3191         sd_config_write_same(sdkp);
3192         kfree(buffer);
3193
3194  out:
3195         return 0;
3196 }
3197
3198 /**
3199  *      sd_unlock_native_capacity - unlock native capacity
3200  *      @disk: struct gendisk to set capacity for
3201  *
3202  *      Block layer calls this function if it detects that partitions
3203  *      on @disk reach beyond the end of the device.  If the SCSI host
3204  *      implements ->unlock_native_capacity() method, it's invoked to
3205  *      give it a chance to adjust the device capacity.
3206  *
3207  *      CONTEXT:
3208  *      Defined by block layer.  Might sleep.
3209  */
3210 static void sd_unlock_native_capacity(struct gendisk *disk)
3211 {
3212         struct scsi_device *sdev = scsi_disk(disk)->device;
3213
3214         if (sdev->host->hostt->unlock_native_capacity)
3215                 sdev->host->hostt->unlock_native_capacity(sdev);
3216 }
3217
3218 /**
3219  *      sd_format_disk_name - format disk name
3220  *      @prefix: name prefix - ie. "sd" for SCSI disks
3221  *      @index: index of the disk to format name for
3222  *      @buf: output buffer
3223  *      @buflen: length of the output buffer
3224  *
3225  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3226  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3227  *      which is followed by sdaaa.
3228  *
3229  *      This is basically 26 base counting with one extra 'nil' entry
3230  *      at the beginning from the second digit on and can be
3231  *      determined using similar method as 26 base conversion with the
3232  *      index shifted -1 after each digit is computed.
3233  *
3234  *      CONTEXT:
3235  *      Don't care.
3236  *
3237  *      RETURNS:
3238  *      0 on success, -errno on failure.
3239  */
3240 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3241 {
3242         const int base = 'z' - 'a' + 1;
3243         char *begin = buf + strlen(prefix);
3244         char *end = buf + buflen;
3245         char *p;
3246         int unit;
3247
3248         p = end - 1;
3249         *p = '\0';
3250         unit = base;
3251         do {
3252                 if (p == begin)
3253                         return -EINVAL;
3254                 *--p = 'a' + (index % unit);
3255                 index = (index / unit) - 1;
3256         } while (index >= 0);
3257
3258         memmove(begin, p, end - p);
3259         memcpy(buf, prefix, strlen(prefix));
3260
3261         return 0;
3262 }
3263
3264 /**
3265  *      sd_probe - called during driver initialization and whenever a
3266  *      new scsi device is attached to the system. It is called once
3267  *      for each scsi device (not just disks) present.
3268  *      @dev: pointer to device object
3269  *
3270  *      Returns 0 if successful (or not interested in this scsi device
3271  *      (e.g. scanner)); 1 when there is an error.
3272  *
3273  *      Note: this function is invoked from the scsi mid-level.
3274  *      This function sets up the mapping between a given
3275  *      <host,channel,id,lun> (found in sdp) and new device name
3276  *      (e.g. /dev/sda). More precisely it is the block device major
3277  *      and minor number that is chosen here.
3278  *
3279  *      Assume sd_probe is not re-entrant (for time being)
3280  *      Also think about sd_probe() and sd_remove() running coincidentally.
3281  **/
3282 static int sd_probe(struct device *dev)
3283 {
3284         struct scsi_device *sdp = to_scsi_device(dev);
3285         struct scsi_disk *sdkp;
3286         struct gendisk *gd;
3287         int index;
3288         int error;
3289
3290         scsi_autopm_get_device(sdp);
3291         error = -ENODEV;
3292         if (sdp->type != TYPE_DISK &&
3293             sdp->type != TYPE_ZBC &&
3294             sdp->type != TYPE_MOD &&
3295             sdp->type != TYPE_RBC)
3296                 goto out;
3297
3298 #ifndef CONFIG_BLK_DEV_ZONED
3299         if (sdp->type == TYPE_ZBC)
3300                 goto out;
3301 #endif
3302         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3303                                         "sd_probe\n"));
3304
3305         error = -ENOMEM;
3306         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3307         if (!sdkp)
3308                 goto out;
3309
3310         gd = alloc_disk(SD_MINORS);
3311         if (!gd)
3312                 goto out_free;
3313
3314         index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3315         if (index < 0) {
3316                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3317                 goto out_put;
3318         }
3319
3320         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3321         if (error) {
3322                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3323                 goto out_free_index;
3324         }
3325
3326         sdkp->device = sdp;
3327         sdkp->driver = &sd_template;
3328         sdkp->disk = gd;
3329         sdkp->index = index;
3330         atomic_set(&sdkp->openers, 0);
3331         atomic_set(&sdkp->device->ioerr_cnt, 0);
3332
3333         if (!sdp->request_queue->rq_timeout) {
3334                 if (sdp->type != TYPE_MOD)
3335                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3336                 else
3337                         blk_queue_rq_timeout(sdp->request_queue,
3338                                              SD_MOD_TIMEOUT);
3339         }
3340
3341         device_initialize(&sdkp->dev);
3342         sdkp->dev.parent = dev;
3343         sdkp->dev.class = &sd_disk_class;
3344         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3345
3346         error = device_add(&sdkp->dev);
3347         if (error)
3348                 goto out_free_index;
3349
3350         get_device(dev);
3351         dev_set_drvdata(dev, sdkp);
3352
3353         gd->major = sd_major((index & 0xf0) >> 4);
3354         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3355
3356         gd->fops = &sd_fops;
3357         gd->private_data = &sdkp->driver;
3358         gd->queue = sdkp->device->request_queue;
3359
3360         /* defaults, until the device tells us otherwise */
3361         sdp->sector_size = 512;
3362         sdkp->capacity = 0;
3363         sdkp->media_present = 1;
3364         sdkp->write_prot = 0;
3365         sdkp->cache_override = 0;
3366         sdkp->WCE = 0;
3367         sdkp->RCD = 0;
3368         sdkp->ATO = 0;
3369         sdkp->first_scan = 1;
3370         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3371
3372         sd_revalidate_disk(gd);
3373
3374         gd->flags = GENHD_FL_EXT_DEVT;
3375         if (sdp->removable) {
3376                 gd->flags |= GENHD_FL_REMOVABLE;
3377                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3378                 gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
3379         }
3380
3381         blk_pm_runtime_init(sdp->request_queue, dev);
3382         if (sdp->rpm_autosuspend) {
3383                 pm_runtime_set_autosuspend_delay(dev,
3384                         sdp->host->hostt->rpm_autosuspend_delay);
3385         }
3386         device_add_disk(dev, gd, NULL);
3387         if (sdkp->capacity)
3388                 sd_dif_config_host(sdkp);
3389
3390         sd_revalidate_disk(gd);
3391
3392         if (sdkp->security) {
3393                 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3394                 if (sdkp->opal_dev)
3395                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3396         }
3397
3398         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3399                   sdp->removable ? "removable " : "");
3400         scsi_autopm_put_device(sdp);
3401
3402         return 0;
3403
3404  out_free_index:
3405         ida_free(&sd_index_ida, index);
3406  out_put:
3407         put_disk(gd);
3408  out_free:
3409         kfree(sdkp);
3410  out:
3411         scsi_autopm_put_device(sdp);
3412         return error;
3413 }
3414
3415 /**
3416  *      sd_remove - called whenever a scsi disk (previously recognized by
3417  *      sd_probe) is detached from the system. It is called (potentially
3418  *      multiple times) during sd module unload.
3419  *      @dev: pointer to device object
3420  *
3421  *      Note: this function is invoked from the scsi mid-level.
3422  *      This function potentially frees up a device name (e.g. /dev/sdc)
3423  *      that could be re-used by a subsequent sd_probe().
3424  *      This function is not called when the built-in sd driver is "exit-ed".
3425  **/
3426 static int sd_remove(struct device *dev)
3427 {
3428         struct scsi_disk *sdkp;
3429         dev_t devt;
3430
3431         sdkp = dev_get_drvdata(dev);
3432         devt = disk_devt(sdkp->disk);
3433         scsi_autopm_get_device(sdkp->device);
3434
3435         async_synchronize_full_domain(&scsi_sd_pm_domain);
3436         device_del(&sdkp->dev);
3437         del_gendisk(sdkp->disk);
3438         sd_shutdown(dev);
3439
3440         free_opal_dev(sdkp->opal_dev);
3441
3442         blk_register_region(devt, SD_MINORS, NULL,
3443                             sd_default_probe, NULL, NULL);
3444
3445         mutex_lock(&sd_ref_mutex);
3446         dev_set_drvdata(dev, NULL);
3447         put_device(&sdkp->dev);
3448         mutex_unlock(&sd_ref_mutex);
3449
3450         return 0;
3451 }
3452
3453 /**
3454  *      scsi_disk_release - Called to free the scsi_disk structure
3455  *      @dev: pointer to embedded class device
3456  *
3457  *      sd_ref_mutex must be held entering this routine.  Because it is
3458  *      called on last put, you should always use the scsi_disk_get()
3459  *      scsi_disk_put() helpers which manipulate the semaphore directly
3460  *      and never do a direct put_device.
3461  **/
3462 static void scsi_disk_release(struct device *dev)
3463 {
3464         struct scsi_disk *sdkp = to_scsi_disk(dev);
3465         struct gendisk *disk = sdkp->disk;
3466         struct request_queue *q = disk->queue;
3467
3468         ida_free(&sd_index_ida, sdkp->index);
3469
3470         /*
3471          * Wait until all requests that are in progress have completed.
3472          * This is necessary to avoid that e.g. scsi_end_request() crashes
3473          * due to clearing the disk->private_data pointer. Wait from inside
3474          * scsi_disk_release() instead of from sd_release() to avoid that
3475          * freezing and unfreezing the request queue affects user space I/O
3476          * in case multiple processes open a /dev/sd... node concurrently.
3477          */
3478         blk_mq_freeze_queue(q);
3479         blk_mq_unfreeze_queue(q);
3480
3481         disk->private_data = NULL;
3482         put_disk(disk);
3483         put_device(&sdkp->device->sdev_gendev);
3484
3485         kfree(sdkp);
3486 }
3487
3488 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3489 {
3490         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3491         struct scsi_sense_hdr sshdr;
3492         struct scsi_device *sdp = sdkp->device;
3493         int res;
3494
3495         if (start)
3496                 cmd[4] |= 1;    /* START */
3497
3498         if (sdp->start_stop_pwr_cond)
3499                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3500
3501         if (!scsi_device_online(sdp))
3502                 return -ENODEV;
3503
3504         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3505                         SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3506         if (res) {
3507                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3508                 if (driver_byte(res) == DRIVER_SENSE)
3509                         sd_print_sense_hdr(sdkp, &sshdr);
3510                 if (scsi_sense_valid(&sshdr) &&
3511                         /* 0x3a is medium not present */
3512                         sshdr.asc == 0x3a)
3513                         res = 0;
3514         }
3515
3516         /* SCSI error codes must not go to the generic layer */
3517         if (res)
3518                 return -EIO;
3519
3520         return 0;
3521 }
3522
3523 /*
3524  * Send a SYNCHRONIZE CACHE instruction down to the device through
3525  * the normal SCSI command structure.  Wait for the command to
3526  * complete.
3527  */
3528 static void sd_shutdown(struct device *dev)
3529 {
3530         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3531
3532         if (!sdkp)
3533                 return;         /* this can happen */
3534
3535         if (pm_runtime_suspended(dev))
3536                 return;
3537
3538         if (sdkp->WCE && sdkp->media_present) {
3539                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3540                 sd_sync_cache(sdkp, NULL);
3541         }
3542
3543         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3544                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3545                 sd_start_stop_device(sdkp, 0);
3546         }
3547 }
3548
3549 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3550 {
3551         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3552         struct scsi_sense_hdr sshdr;
3553         int ret = 0;
3554
3555         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3556                 return 0;
3557
3558         if (sdkp->WCE && sdkp->media_present) {
3559                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3560                 ret = sd_sync_cache(sdkp, &sshdr);
3561
3562                 if (ret) {
3563                         /* ignore OFFLINE device */
3564                         if (ret == -ENODEV)
3565                                 return 0;
3566
3567                         if (!scsi_sense_valid(&sshdr) ||
3568                             sshdr.sense_key != ILLEGAL_REQUEST)
3569                                 return ret;
3570
3571                         /*
3572                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3573                          * doesn't support sync. There's not much to do and
3574                          * suspend shouldn't fail.
3575                          */
3576                         ret = 0;
3577                 }
3578         }
3579
3580         if (sdkp->device->manage_start_stop) {
3581                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3582                 /* an error is not worth aborting a system sleep */
3583                 ret = sd_start_stop_device(sdkp, 0);
3584                 if (ignore_stop_errors)
3585                         ret = 0;
3586         }
3587
3588         return ret;
3589 }
3590
3591 static int sd_suspend_system(struct device *dev)
3592 {
3593         return sd_suspend_common(dev, true);
3594 }
3595
3596 static int sd_suspend_runtime(struct device *dev)
3597 {
3598         return sd_suspend_common(dev, false);
3599 }
3600
3601 static int sd_resume(struct device *dev)
3602 {
3603         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3604         int ret;
3605
3606         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3607                 return 0;
3608
3609         if (!sdkp->device->manage_start_stop)
3610                 return 0;
3611
3612         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3613         ret = sd_start_stop_device(sdkp, 1);
3614         if (!ret)
3615                 opal_unlock_from_suspend(sdkp->opal_dev);
3616         return ret;
3617 }
3618
3619 /**
3620  *      init_sd - entry point for this driver (both when built in or when
3621  *      a module).
3622  *
3623  *      Note: this function registers this driver with the scsi mid-level.
3624  **/
3625 static int __init init_sd(void)
3626 {
3627         int majors = 0, i, err;
3628
3629         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3630
3631         for (i = 0; i < SD_MAJORS; i++) {
3632                 if (register_blkdev(sd_major(i), "sd") != 0)
3633                         continue;
3634                 majors++;
3635                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3636                                     sd_default_probe, NULL, NULL);
3637         }
3638
3639         if (!majors)
3640                 return -ENODEV;
3641
3642         err = class_register(&sd_disk_class);
3643         if (err)
3644                 goto err_out;
3645
3646         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3647                                          0, 0, NULL);
3648         if (!sd_cdb_cache) {
3649                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3650                 err = -ENOMEM;
3651                 goto err_out_class;
3652         }
3653
3654         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3655         if (!sd_cdb_pool) {
3656                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3657                 err = -ENOMEM;
3658                 goto err_out_cache;
3659         }
3660
3661         sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
3662         if (!sd_page_pool) {
3663                 printk(KERN_ERR "sd: can't init discard page pool\n");
3664                 err = -ENOMEM;
3665                 goto err_out_ppool;
3666         }
3667
3668         err = scsi_register_driver(&sd_template.gendrv);
3669         if (err)
3670                 goto err_out_driver;
3671
3672         return 0;
3673
3674 err_out_driver:
3675         mempool_destroy(sd_page_pool);
3676
3677 err_out_ppool:
3678         mempool_destroy(sd_cdb_pool);
3679
3680 err_out_cache:
3681         kmem_cache_destroy(sd_cdb_cache);
3682
3683 err_out_class:
3684         class_unregister(&sd_disk_class);
3685 err_out:
3686         for (i = 0; i < SD_MAJORS; i++)
3687                 unregister_blkdev(sd_major(i), "sd");
3688         return err;
3689 }
3690
3691 /**
3692  *      exit_sd - exit point for this driver (when it is a module).
3693  *
3694  *      Note: this function unregisters this driver from the scsi mid-level.
3695  **/
3696 static void __exit exit_sd(void)
3697 {
3698         int i;
3699
3700         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3701
3702         scsi_unregister_driver(&sd_template.gendrv);
3703         mempool_destroy(sd_cdb_pool);
3704         mempool_destroy(sd_page_pool);
3705         kmem_cache_destroy(sd_cdb_cache);
3706
3707         class_unregister(&sd_disk_class);
3708
3709         for (i = 0; i < SD_MAJORS; i++) {
3710                 blk_unregister_region(sd_major(i), SD_MINORS);
3711                 unregister_blkdev(sd_major(i), "sd");
3712         }
3713 }
3714
3715 module_init(init_sd);
3716 module_exit(exit_sd);
3717
3718 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
3719 {
3720         scsi_print_sense_hdr(sdkp->device,
3721                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3722 }
3723
3724 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result)
3725 {
3726         const char *hb_string = scsi_hostbyte_string(result);
3727         const char *db_string = scsi_driverbyte_string(result);
3728
3729         if (hb_string || db_string)
3730                 sd_printk(KERN_INFO, sdkp,
3731                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3732                           hb_string ? hb_string : "invalid",
3733                           db_string ? db_string : "invalid");
3734         else
3735                 sd_printk(KERN_INFO, sdkp,
3736                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3737                           msg, host_byte(result), driver_byte(result));
3738 }