drivers/scsi/sd.c

   1 /*
   2  *      sd.c Copyright (C) 1992 Drew Eckhardt
   3  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   4  *
   5  *      Linux scsi disk driver
   6  *              Initial versions: Drew Eckhardt
   7  *              Subsequent revisions: Eric Youngdale
   8  *      Modification history:
   9  *       - Drew Eckhardt <drew@colorado.edu> original
  10  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
  11  *         outstanding request, and other enhancements.
  12  *         Support loadable low-level scsi drivers.
  13  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
  14  *         eight major numbers.
  15  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  16  *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
  17  *         sd_init and cleanups.
  18  *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  19  *         not being read in sd_open. Fix problem where removable media
  20  *         could be ejected after sd_open.
  21  *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  22  *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
  23  *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
  24  *         Support 32k/1M disks.
  25  *
  26  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  27  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  28  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  29  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  30  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  31  *      Note: when the logging level is set by the user, it must be greater
  32  *      than the level indicated above to trigger output.
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/fs.h>
  37 #include <linux/kernel.h>
  38 #include <linux/mm.h>
  39 #include <linux/bio.h>
  40 #include <linux/genhd.h>
  41 #include <linux/hdreg.h>
  42 #include <linux/errno.h>
  43 #include <linux/idr.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/init.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/blkpg.h>
  48 #include <linux/blk-pm.h>
  49 #include <linux/delay.h>
  50 #include <linux/mutex.h>
  51 #include <linux/string_helpers.h>
  52 #include <linux/async.h>
  53 #include <linux/slab.h>
  54 #include <linux/sed-opal.h>
  55 #include <linux/pm_runtime.h>
  56 #include <linux/pr.h>
  57 #include <linux/t10-pi.h>
  58 #include <linux/uaccess.h>
  59 #include <asm/unaligned.h>
  60
  61 #include <scsi/scsi.h>
  62 #include <scsi/scsi_cmnd.h>
  63 #include <scsi/scsi_dbg.h>
  64 #include <scsi/scsi_device.h>
  65 #include <scsi/scsi_driver.h>
  66 #include <scsi/scsi_eh.h>
  67 #include <scsi/scsi_host.h>
  68 #include <scsi/scsi_ioctl.h>
  69 #include <scsi/scsicam.h>
  70
  71 #include "sd.h"
  72 #include "scsi_priv.h"
  73 #include "scsi_logging.h"
  74
  75 MODULE_AUTHOR("Eric Youngdale");
  76 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  77 MODULE_LICENSE("GPL");
  78
  79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  95 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  96 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  97 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  98 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
  99
 100 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
 101 #define SD_MINORS       16
 102 #else
 103 #define SD_MINORS       0
 104 #endif
 105
 106 static void sd_config_discard(struct scsi_disk *, unsigned int);
 107 static void sd_config_write_same(struct scsi_disk *);
 108 static int  sd_revalidate_disk(struct gendisk *);
 109 static void sd_unlock_native_capacity(struct gendisk *disk);
 110 static int  sd_probe(struct device *);
 111 static int  sd_remove(struct device *);
 112 static void sd_shutdown(struct device *);
 113 static int sd_suspend_system(struct device *);
 114 static int sd_suspend_runtime(struct device *);
 115 static int sd_resume(struct device *);
 116 static void sd_rescan(struct device *);
 117 static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
 118 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 119 static int sd_done(struct scsi_cmnd *);
 120 static void sd_eh_reset(struct scsi_cmnd *);
 121 static int sd_eh_action(struct scsi_cmnd *, int);
 122 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 123 static void scsi_disk_release(struct device *cdev);
 124 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 125 static void sd_print_result(const struct scsi_disk *, const char *, int);
 126
 127 static DEFINE_IDA(sd_index_ida);
 128
 129 /* This semaphore is used to mediate the 0->1 reference get in the
 130  * face of object destruction (i.e. we can't allow a get on an
 131  * object after last put) */
 132 static DEFINE_MUTEX(sd_ref_mutex);
 133
 134 static struct kmem_cache *sd_cdb_cache;
 135 static mempool_t *sd_cdb_pool;
 136 static mempool_t *sd_page_pool;
 137
 138 static const char *sd_cache_types[] = {
 139         "write through", "none", "write back",
 140         "write back, no read (daft)"
 141 };
 142
 143 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 144 {
 145         bool wc = false, fua = false;
 146
 147         if (sdkp->WCE) {
 148                 wc = true;
 149                 if (sdkp->DPOFUA)
 150                         fua = true;
 151         }
 152
 153         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 154 }
 155
 156 static ssize_t
 157 cache_type_store(struct device *dev, struct device_attribute *attr,
 158                  const char *buf, size_t count)
 159 {
 160         int ct, rcd, wce, sp;
 161         struct scsi_disk *sdkp = to_scsi_disk(dev);
 162         struct scsi_device *sdp = sdkp->device;
 163         char buffer[64];
 164         char *buffer_data;
 165         struct scsi_mode_data data;
 166         struct scsi_sense_hdr sshdr;
 167         static const char temp[] = "temporary ";
 168         int len;
 169
 170         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 171                 /* no cache control on RBC devices; theoretically they
 172                  * can do it, but there's probably so many exceptions
 173                  * it's not worth the risk */
 174                 return -EINVAL;
 175
 176         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 177                 buf += sizeof(temp) - 1;
 178                 sdkp->cache_override = 1;
 179         } else {
 180                 sdkp->cache_override = 0;
 181         }
 182
 183         ct = sysfs_match_string(sd_cache_types, buf);
 184         if (ct < 0)
 185                 return -EINVAL;
 186
 187         rcd = ct & 0x01 ? 1 : 0;
 188         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 189
 190         if (sdkp->cache_override) {
 191                 sdkp->WCE = wce;
 192                 sdkp->RCD = rcd;
 193                 sd_set_flush_flag(sdkp);
 194                 return count;
 195         }
 196
 197         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 198                             SD_MAX_RETRIES, &data, NULL))
 199                 return -EINVAL;
 200         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 201                   data.block_descriptor_length);
 202         buffer_data = buffer + data.header_length +
 203                 data.block_descriptor_length;
 204         buffer_data[2] &= ~0x05;
 205         buffer_data[2] |= wce << 2 | rcd;
 206         sp = buffer_data[0] & 0x80 ? 1 : 0;
 207         buffer_data[0] &= ~0x80;
 208
 209         /*
 210          * Ensure WP, DPOFUA, and RESERVED fields are cleared in
 211          * received mode parameter buffer before doing MODE SELECT.
 212          */
 213         data.device_specific = 0;
 214
 215         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 216                              SD_MAX_RETRIES, &data, &sshdr)) {
 217                 if (scsi_sense_valid(&sshdr))
 218                         sd_print_sense_hdr(sdkp, &sshdr);
 219                 return -EINVAL;
 220         }
 221         revalidate_disk(sdkp->disk);
 222         return count;
 223 }
 224
 225 static ssize_t
 226 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 227                        char *buf)
 228 {
 229         struct scsi_disk *sdkp = to_scsi_disk(dev);
 230         struct scsi_device *sdp = sdkp->device;
 231
 232         return sprintf(buf, "%u\n", sdp->manage_start_stop);
 233 }
 234
 235 static ssize_t
 236 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 237                         const char *buf, size_t count)
 238 {
 239         struct scsi_disk *sdkp = to_scsi_disk(dev);
 240         struct scsi_device *sdp = sdkp->device;
 241         bool v;
 242
 243         if (!capable(CAP_SYS_ADMIN))
 244                 return -EACCES;
 245
 246         if (kstrtobool(buf, &v))
 247                 return -EINVAL;
 248
 249         sdp->manage_start_stop = v;
 250
 251         return count;
 252 }
 253 static DEVICE_ATTR_RW(manage_start_stop);
 254
 255 static ssize_t
 256 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 257 {
 258         struct scsi_disk *sdkp = to_scsi_disk(dev);
 259
 260         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 261 }
 262
 263 static ssize_t
 264 allow_restart_store(struct device *dev, struct device_attribute *attr,
 265                     const char *buf, size_t count)
 266 {
 267         bool v;
 268         struct scsi_disk *sdkp = to_scsi_disk(dev);
 269         struct scsi_device *sdp = sdkp->device;
 270
 271         if (!capable(CAP_SYS_ADMIN))
 272                 return -EACCES;
 273
 274         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 275                 return -EINVAL;
 276
 277         if (kstrtobool(buf, &v))
 278                 return -EINVAL;
 279
 280         sdp->allow_restart = v;
 281
 282         return count;
 283 }
 284 static DEVICE_ATTR_RW(allow_restart);
 285
 286 static ssize_t
 287 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 288 {
 289         struct scsi_disk *sdkp = to_scsi_disk(dev);
 290         int ct = sdkp->RCD + 2*sdkp->WCE;
 291
 292         return sprintf(buf, "%s\n", sd_cache_types[ct]);
 293 }
 294 static DEVICE_ATTR_RW(cache_type);
 295
 296 static ssize_t
 297 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 298 {
 299         struct scsi_disk *sdkp = to_scsi_disk(dev);
 300
 301         return sprintf(buf, "%u\n", sdkp->DPOFUA);
 302 }
 303 static DEVICE_ATTR_RO(FUA);
 304
 305 static ssize_t
 306 protection_type_show(struct device *dev, struct device_attribute *attr,
 307                      char *buf)
 308 {
 309         struct scsi_disk *sdkp = to_scsi_disk(dev);
 310
 311         return sprintf(buf, "%u\n", sdkp->protection_type);
 312 }
 313
 314 static ssize_t
 315 protection_type_store(struct device *dev, struct device_attribute *attr,
 316                       const char *buf, size_t count)
 317 {
 318         struct scsi_disk *sdkp = to_scsi_disk(dev);
 319         unsigned int val;
 320         int err;
 321
 322         if (!capable(CAP_SYS_ADMIN))
 323                 return -EACCES;
 324
 325         err = kstrtouint(buf, 10, &val);
 326
 327         if (err)
 328                 return err;
 329
 330         if (val <= T10_PI_TYPE3_PROTECTION)
 331                 sdkp->protection_type = val;
 332
 333         return count;
 334 }
 335 static DEVICE_ATTR_RW(protection_type);
 336
 337 static ssize_t
 338 protection_mode_show(struct device *dev, struct device_attribute *attr,
 339                      char *buf)
 340 {
 341         struct scsi_disk *sdkp = to_scsi_disk(dev);
 342         struct scsi_device *sdp = sdkp->device;
 343         unsigned int dif, dix;
 344
 345         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 346         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 347
 348         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 349                 dif = 0;
 350                 dix = 1;
 351         }
 352
 353         if (!dif && !dix)
 354                 return sprintf(buf, "none\n");
 355
 356         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 357 }
 358 static DEVICE_ATTR_RO(protection_mode);
 359
 360 static ssize_t
 361 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 362 {
 363         struct scsi_disk *sdkp = to_scsi_disk(dev);
 364
 365         return sprintf(buf, "%u\n", sdkp->ATO);
 366 }
 367 static DEVICE_ATTR_RO(app_tag_own);
 368
 369 static ssize_t
 370 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 371                        char *buf)
 372 {
 373         struct scsi_disk *sdkp = to_scsi_disk(dev);
 374
 375         return sprintf(buf, "%u\n", sdkp->lbpme);
 376 }
 377 static DEVICE_ATTR_RO(thin_provisioning);
 378
 379 /* sysfs_match_string() requires dense arrays */
 380 static const char *lbp_mode[] = {
 381         [SD_LBP_FULL]           = "full",
 382         [SD_LBP_UNMAP]          = "unmap",
 383         [SD_LBP_WS16]           = "writesame_16",
 384         [SD_LBP_WS10]           = "writesame_10",
 385         [SD_LBP_ZERO]           = "writesame_zero",
 386         [SD_LBP_DISABLE]        = "disabled",
 387 };
 388
 389 static ssize_t
 390 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 391                        char *buf)
 392 {
 393         struct scsi_disk *sdkp = to_scsi_disk(dev);
 394
 395         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 396 }
 397
 398 static ssize_t
 399 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 400                         const char *buf, size_t count)
 401 {
 402         struct scsi_disk *sdkp = to_scsi_disk(dev);
 403         struct scsi_device *sdp = sdkp->device;
 404         int mode;
 405
 406         if (!capable(CAP_SYS_ADMIN))
 407                 return -EACCES;
 408
 409         if (sd_is_zoned(sdkp)) {
 410                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 411                 return count;
 412         }
 413
 414         if (sdp->type != TYPE_DISK)
 415                 return -EINVAL;
 416
 417         mode = sysfs_match_string(lbp_mode, buf);
 418         if (mode < 0)
 419                 return -EINVAL;
 420
 421         sd_config_discard(sdkp, mode);
 422
 423         return count;
 424 }
 425 static DEVICE_ATTR_RW(provisioning_mode);
 426
 427 /* sysfs_match_string() requires dense arrays */
 428 static const char *zeroing_mode[] = {
 429         [SD_ZERO_WRITE]         = "write",
 430         [SD_ZERO_WS]            = "writesame",
 431         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 432         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 433 };
 434
 435 static ssize_t
 436 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 437                   char *buf)
 438 {
 439         struct scsi_disk *sdkp = to_scsi_disk(dev);
 440
 441         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 442 }
 443
 444 static ssize_t
 445 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 446                    const char *buf, size_t count)
 447 {
 448         struct scsi_disk *sdkp = to_scsi_disk(dev);
 449         int mode;
 450
 451         if (!capable(CAP_SYS_ADMIN))
 452                 return -EACCES;
 453
 454         mode = sysfs_match_string(zeroing_mode, buf);
 455         if (mode < 0)
 456                 return -EINVAL;
 457
 458         sdkp->zeroing_mode = mode;
 459
 460         return count;
 461 }
 462 static DEVICE_ATTR_RW(zeroing_mode);
 463
 464 static ssize_t
 465 max_medium_access_timeouts_show(struct device *dev,
 466                                 struct device_attribute *attr, char *buf)
 467 {
 468         struct scsi_disk *sdkp = to_scsi_disk(dev);
 469
 470         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 471 }
 472
 473 static ssize_t
 474 max_medium_access_timeouts_store(struct device *dev,
 475                                  struct device_attribute *attr, const char *buf,
 476                                  size_t count)
 477 {
 478         struct scsi_disk *sdkp = to_scsi_disk(dev);
 479         int err;
 480
 481         if (!capable(CAP_SYS_ADMIN))
 482                 return -EACCES;
 483
 484         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 485
 486         return err ? err : count;
 487 }
 488 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 489
 490 static ssize_t
 491 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 492                            char *buf)
 493 {
 494         struct scsi_disk *sdkp = to_scsi_disk(dev);
 495
 496         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 497 }
 498
 499 static ssize_t
 500 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 501                             const char *buf, size_t count)
 502 {
 503         struct scsi_disk *sdkp = to_scsi_disk(dev);
 504         struct scsi_device *sdp = sdkp->device;
 505         unsigned long max;
 506         int err;
 507
 508         if (!capable(CAP_SYS_ADMIN))
 509                 return -EACCES;
 510
 511         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 512                 return -EINVAL;
 513
 514         err = kstrtoul(buf, 10, &max);
 515
 516         if (err)
 517                 return err;
 518
 519         if (max == 0)
 520                 sdp->no_write_same = 1;
 521         else if (max <= SD_MAX_WS16_BLOCKS) {
 522                 sdp->no_write_same = 0;
 523                 sdkp->max_ws_blocks = max;
 524         }
 525
 526         sd_config_write_same(sdkp);
 527
 528         return count;
 529 }
 530 static DEVICE_ATTR_RW(max_write_same_blocks);
 531
 532 static struct attribute *sd_disk_attrs[] = {
 533         &dev_attr_cache_type.attr,
 534         &dev_attr_FUA.attr,
 535         &dev_attr_allow_restart.attr,
 536         &dev_attr_manage_start_stop.attr,
 537         &dev_attr_protection_type.attr,
 538         &dev_attr_protection_mode.attr,
 539         &dev_attr_app_tag_own.attr,
 540         &dev_attr_thin_provisioning.attr,
 541         &dev_attr_provisioning_mode.attr,
 542         &dev_attr_zeroing_mode.attr,
 543         &dev_attr_max_write_same_blocks.attr,
 544         &dev_attr_max_medium_access_timeouts.attr,
 545         NULL,
 546 };
 547 ATTRIBUTE_GROUPS(sd_disk);
 548
 549 static struct class sd_disk_class = {
 550         .name           = "scsi_disk",
 551         .owner          = THIS_MODULE,
 552         .dev_release    = scsi_disk_release,
 553         .dev_groups     = sd_disk_groups,
 554 };
 555
 556 static const struct dev_pm_ops sd_pm_ops = {
 557         .suspend                = sd_suspend_system,
 558         .resume                 = sd_resume,
 559         .poweroff               = sd_suspend_system,
 560         .restore                = sd_resume,
 561         .runtime_suspend        = sd_suspend_runtime,
 562         .runtime_resume         = sd_resume,
 563 };
 564
 565 static struct scsi_driver sd_template = {
 566         .gendrv = {
 567                 .name           = "sd",
 568                 .owner          = THIS_MODULE,
 569                 .probe          = sd_probe,
 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         bool dif, dix;
1168         unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1169         bool write = rq_data_dir(rq) == WRITE;
1170         unsigned char protect, fua;
1171         blk_status_t ret;
1172
1173         ret = scsi_init_io(cmd);
1174         if (ret != BLK_STS_OK)
1175                 return ret;
1176
1177         if (!scsi_device_online(sdp) || sdp->changed) {
1178                 scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1179                 return BLK_STS_IOERR;
1180         }
1181
1182         if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->rq_disk)) {
1183                 scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1184                 return BLK_STS_IOERR;
1185         }
1186
1187         if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1188                 scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1189                 return BLK_STS_IOERR;
1190         }
1191
1192         /*
1193          * Some SD card readers can't handle accesses which touch the
1194          * last one or two logical blocks. Split accesses as needed.
1195          */
1196         threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1197
1198         if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1199                 if (lba < threshold) {
1200                         /* Access up to the threshold but not beyond */
1201                         nr_blocks = threshold - lba;
1202                 } else {
1203                         /* Access only a single logical block */
1204                         nr_blocks = 1;
1205                 }
1206         }
1207
1208         fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1209         dix = scsi_prot_sg_count(cmd);
1210         dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
1211
1212         if (write && dix)
1213                 t10_pi_prepare(cmd->request, sdkp->protection_type);
1214
1215         if (dif || dix)
1216                 protect = sd_setup_protect_cmnd(cmd, dix, dif);
1217         else
1218                 protect = 0;
1219
1220         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1221                 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1222                                          protect | fua);
1223         } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1224                 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1225                                          protect | fua);
1226         } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1227                    sdp->use_10_for_rw || protect) {
1228                 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1229                                          protect | fua);
1230         } else {
1231                 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1232                                         protect | fua);
1233         }
1234
1235         if (unlikely(ret != BLK_STS_OK))
1236                 return ret;
1237
1238         /*
1239          * We shouldn't disconnect in the middle of a sector, so with a dumb
1240          * host adapter, it's safe to assume that we can at least transfer
1241          * this many bytes between each connect / disconnect.
1242          */
1243         cmd->transfersize = sdp->sector_size;
1244         cmd->underflow = nr_blocks << 9;
1245         cmd->allowed = SD_MAX_RETRIES;
1246         cmd->sdb.length = nr_blocks * sdp->sector_size;
1247
1248         SCSI_LOG_HLQUEUE(1,
1249                          scmd_printk(KERN_INFO, cmd,
1250                                      "%s: block=%llu, count=%d\n", __func__,
1251                                      (unsigned long long)blk_rq_pos(rq),
1252                                      blk_rq_sectors(rq)));
1253         SCSI_LOG_HLQUEUE(2,
1254                          scmd_printk(KERN_INFO, cmd,
1255                                      "%s %d/%u 512 byte blocks.\n",
1256                                      write ? "writing" : "reading", nr_blocks,
1257                                      blk_rq_sectors(rq)));
1258
1259         /*
1260          * This indicates that the command is ready from our end to be
1261          * queued.
1262          */
1263         return BLK_STS_OK;
1264 }
1265
1266 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1267 {
1268         struct request *rq = cmd->request;
1269
1270         switch (req_op(rq)) {
1271         case REQ_OP_DISCARD:
1272                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1273                 case SD_LBP_UNMAP:
1274                         return sd_setup_unmap_cmnd(cmd);
1275                 case SD_LBP_WS16:
1276                         return sd_setup_write_same16_cmnd(cmd, true);
1277                 case SD_LBP_WS10:
1278                         return sd_setup_write_same10_cmnd(cmd, true);
1279                 case SD_LBP_ZERO:
1280                         return sd_setup_write_same10_cmnd(cmd, false);
1281                 default:
1282                         return BLK_STS_TARGET;
1283                 }
1284         case REQ_OP_WRITE_ZEROES:
1285                 return sd_setup_write_zeroes_cmnd(cmd);
1286         case REQ_OP_WRITE_SAME:
1287                 return sd_setup_write_same_cmnd(cmd);
1288         case REQ_OP_FLUSH:
1289                 return sd_setup_flush_cmnd(cmd);
1290         case REQ_OP_READ:
1291         case REQ_OP_WRITE:
1292                 return sd_setup_read_write_cmnd(cmd);
1293         case REQ_OP_ZONE_RESET:
1294                 return sd_zbc_setup_reset_cmnd(cmd);
1295         default:
1296                 WARN_ON_ONCE(1);
1297                 return BLK_STS_NOTSUPP;
1298         }
1299 }
1300
1301 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1302 {
1303         struct request *rq = SCpnt->request;
1304         u8 *cmnd;
1305
1306         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1307                 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1308
1309         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1310                 cmnd = SCpnt->cmnd;
1311                 SCpnt->cmnd = NULL;
1312                 SCpnt->cmd_len = 0;
1313                 mempool_free(cmnd, sd_cdb_pool);
1314         }
1315 }
1316
1317 /**
1318  *      sd_open - open a scsi disk device
1319  *      @bdev: Block device of the scsi disk to open
1320  *      @mode: FMODE_* mask
1321  *
1322  *      Returns 0 if successful. Returns a negated errno value in case
1323  *      of error.
1324  *
1325  *      Note: This can be called from a user context (e.g. fsck(1) )
1326  *      or from within the kernel (e.g. as a result of a mount(1) ).
1327  *      In the latter case @inode and @filp carry an abridged amount
1328  *      of information as noted above.
1329  *
1330  *      Locking: called with bdev->bd_mutex held.
1331  **/
1332 static int sd_open(struct block_device *bdev, fmode_t mode)
1333 {
1334         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1335         struct scsi_device *sdev;
1336         int retval;
1337
1338         if (!sdkp)
1339                 return -ENXIO;
1340
1341         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1342
1343         sdev = sdkp->device;
1344
1345         /*
1346          * If the device is in error recovery, wait until it is done.
1347          * If the device is offline, then disallow any access to it.
1348          */
1349         retval = -ENXIO;
1350         if (!scsi_block_when_processing_errors(sdev))
1351                 goto error_out;
1352
1353         if (sdev->removable || sdkp->write_prot)
1354                 check_disk_change(bdev);
1355
1356         /*
1357          * If the drive is empty, just let the open fail.
1358          */
1359         retval = -ENOMEDIUM;
1360         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1361                 goto error_out;
1362
1363         /*
1364          * If the device has the write protect tab set, have the open fail
1365          * if the user expects to be able to write to the thing.
1366          */
1367         retval = -EROFS;
1368         if (sdkp->write_prot && (mode & FMODE_WRITE))
1369                 goto error_out;
1370
1371         /*
1372          * It is possible that the disk changing stuff resulted in
1373          * the device being taken offline.  If this is the case,
1374          * report this to the user, and don't pretend that the
1375          * open actually succeeded.
1376          */
1377         retval = -ENXIO;
1378         if (!scsi_device_online(sdev))
1379                 goto error_out;
1380
1381         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1382                 if (scsi_block_when_processing_errors(sdev))
1383                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1384         }
1385
1386         return 0;
1387
1388 error_out:
1389         scsi_disk_put(sdkp);
1390         return retval;
1391 }
1392
1393 /**
1394  *      sd_release - invoked when the (last) close(2) is called on this
1395  *      scsi disk.
1396  *      @disk: disk to release
1397  *      @mode: FMODE_* mask
1398  *
1399  *      Returns 0.
1400  *
1401  *      Note: may block (uninterruptible) if error recovery is underway
1402  *      on this disk.
1403  *
1404  *      Locking: called with bdev->bd_mutex held.
1405  **/
1406 static void sd_release(struct gendisk *disk, fmode_t mode)
1407 {
1408         struct scsi_disk *sdkp = scsi_disk(disk);
1409         struct scsi_device *sdev = sdkp->device;
1410
1411         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1412
1413         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1414                 if (scsi_block_when_processing_errors(sdev))
1415                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1416         }
1417
1418         /*
1419          * XXX and what if there are packets in flight and this close()
1420          * XXX is followed by a "rmmod sd_mod"?
1421          */
1422
1423         scsi_disk_put(sdkp);
1424 }
1425
1426 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1427 {
1428         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1429         struct scsi_device *sdp = sdkp->device;
1430         struct Scsi_Host *host = sdp->host;
1431         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1432         int diskinfo[4];
1433
1434         /* default to most commonly used values */
1435         diskinfo[0] = 0x40;     /* 1 << 6 */
1436         diskinfo[1] = 0x20;     /* 1 << 5 */
1437         diskinfo[2] = capacity >> 11;
1438
1439         /* override with calculated, extended default, or driver values */
1440         if (host->hostt->bios_param)
1441                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1442         else
1443                 scsicam_bios_param(bdev, capacity, diskinfo);
1444
1445         geo->heads = diskinfo[0];
1446         geo->sectors = diskinfo[1];
1447         geo->cylinders = diskinfo[2];
1448         return 0;
1449 }
1450
1451 /**
1452  *      sd_ioctl - process an ioctl
1453  *      @bdev: target block device
1454  *      @mode: FMODE_* mask
1455  *      @cmd: ioctl command number
1456  *      @arg: this is third argument given to ioctl(2) system call.
1457  *      Often contains a pointer.
1458  *
1459  *      Returns 0 if successful (some ioctls return positive numbers on
1460  *      success as well). Returns a negated errno value in case of error.
1461  *
1462  *      Note: most ioctls are forward onto the block subsystem or further
1463  *      down in the scsi subsystem.
1464  **/
1465 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1466                     unsigned int cmd, unsigned long arg)
1467 {
1468         struct gendisk *disk = bdev->bd_disk;
1469         struct scsi_disk *sdkp = scsi_disk(disk);
1470         struct scsi_device *sdp = sdkp->device;
1471         void __user *p = (void __user *)arg;
1472         int error;
1473
1474         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1475                                     "cmd=0x%x\n", disk->disk_name, cmd));
1476
1477         error = scsi_verify_blk_ioctl(bdev, cmd);
1478         if (error < 0)
1479                 return error;
1480
1481         /*
1482          * If we are in the middle of error recovery, don't let anyone
1483          * else try and use this device.  Also, if error recovery fails, it
1484          * may try and take the device offline, in which case all further
1485          * access to the device is prohibited.
1486          */
1487         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1488                         (mode & FMODE_NDELAY) != 0);
1489         if (error)
1490                 goto out;
1491
1492         if (is_sed_ioctl(cmd))
1493                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1494
1495         /*
1496          * Send SCSI addressing ioctls directly to mid level, send other
1497          * ioctls to block level and then onto mid level if they can't be
1498          * resolved.
1499          */
1500         switch (cmd) {
1501                 case SCSI_IOCTL_GET_IDLUN:
1502                 case SCSI_IOCTL_GET_BUS_NUMBER:
1503                         error = scsi_ioctl(sdp, cmd, p);
1504                         break;
1505                 default:
1506                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1507                         if (error != -ENOTTY)
1508                                 break;
1509                         error = scsi_ioctl(sdp, cmd, p);
1510                         break;
1511         }
1512 out:
1513         return error;
1514 }
1515
1516 static void set_media_not_present(struct scsi_disk *sdkp)
1517 {
1518         if (sdkp->media_present)
1519                 sdkp->device->changed = 1;
1520
1521         if (sdkp->device->removable) {
1522                 sdkp->media_present = 0;
1523                 sdkp->capacity = 0;
1524         }
1525 }
1526
1527 static int media_not_present(struct scsi_disk *sdkp,
1528                              struct scsi_sense_hdr *sshdr)
1529 {
1530         if (!scsi_sense_valid(sshdr))
1531                 return 0;
1532
1533         /* not invoked for commands that could return deferred errors */
1534         switch (sshdr->sense_key) {
1535         case UNIT_ATTENTION:
1536         case NOT_READY:
1537                 /* medium not present */
1538                 if (sshdr->asc == 0x3A) {
1539                         set_media_not_present(sdkp);
1540                         return 1;
1541                 }
1542         }
1543         return 0;
1544 }
1545
1546 /**
1547  *      sd_check_events - check media events
1548  *      @disk: kernel device descriptor
1549  *      @clearing: disk events currently being cleared
1550  *
1551  *      Returns mask of DISK_EVENT_*.
1552  *
1553  *      Note: this function is invoked from the block subsystem.
1554  **/
1555 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1556 {
1557         struct scsi_disk *sdkp = scsi_disk_get(disk);
1558         struct scsi_device *sdp;
1559         int retval;
1560
1561         if (!sdkp)
1562                 return 0;
1563
1564         sdp = sdkp->device;
1565         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1566
1567         /*
1568          * If the device is offline, don't send any commands - just pretend as
1569          * if the command failed.  If the device ever comes back online, we
1570          * can deal with it then.  It is only because of unrecoverable errors
1571          * that we would ever take a device offline in the first place.
1572          */
1573         if (!scsi_device_online(sdp)) {
1574                 set_media_not_present(sdkp);
1575                 goto out;
1576         }
1577
1578         /*
1579          * Using TEST_UNIT_READY enables differentiation between drive with
1580          * no cartridge loaded - NOT READY, drive with changed cartridge -
1581          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1582          *
1583          * Drives that auto spin down. eg iomega jaz 1G, will be started
1584          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1585          * sd_revalidate() is called.
1586          */
1587         if (scsi_block_when_processing_errors(sdp)) {
1588                 struct scsi_sense_hdr sshdr = { 0, };
1589
1590                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1591                                               &sshdr);
1592
1593                 /* failed to execute TUR, assume media not present */
1594                 if (host_byte(retval)) {
1595                         set_media_not_present(sdkp);
1596                         goto out;
1597                 }
1598
1599                 if (media_not_present(sdkp, &sshdr))
1600                         goto out;
1601         }
1602
1603         /*
1604          * For removable scsi disk we have to recognise the presence
1605          * of a disk in the drive.
1606          */
1607         if (!sdkp->media_present)
1608                 sdp->changed = 1;
1609         sdkp->media_present = 1;
1610 out:
1611         /*
1612          * sdp->changed is set under the following conditions:
1613          *
1614          *      Medium present state has changed in either direction.
1615          *      Device has indicated UNIT_ATTENTION.
1616          */
1617         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1618         sdp->changed = 0;
1619         scsi_disk_put(sdkp);
1620         return retval;
1621 }
1622
1623 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1624 {
1625         int retries, res;
1626         struct scsi_device *sdp = sdkp->device;
1627         const int timeout = sdp->request_queue->rq_timeout
1628                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1629         struct scsi_sense_hdr my_sshdr;
1630
1631         if (!scsi_device_online(sdp))
1632                 return -ENODEV;
1633
1634         /* caller might not be interested in sense, but we need it */
1635         if (!sshdr)
1636                 sshdr = &my_sshdr;
1637
1638         for (retries = 3; retries > 0; --retries) {
1639                 unsigned char cmd[10] = { 0 };
1640
1641                 cmd[0] = SYNCHRONIZE_CACHE;
1642                 /*
1643                  * Leave the rest of the command zero to indicate
1644                  * flush everything.
1645                  */
1646                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1647                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1648                 if (res == 0)
1649                         break;
1650         }
1651
1652         if (res) {
1653                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1654
1655                 if (driver_byte(res) == DRIVER_SENSE)
1656                         sd_print_sense_hdr(sdkp, sshdr);
1657
1658                 /* we need to evaluate the error return  */
1659                 if (scsi_sense_valid(sshdr) &&
1660                         (sshdr->asc == 0x3a ||  /* medium not present */
1661                          sshdr->asc == 0x20))   /* invalid command */
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
1691 #ifdef CONFIG_COMPAT
1692 /*
1693  * This gets directly called from VFS. When the ioctl
1694  * is not recognized we go back to the other translation paths.
1695  */
1696 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1697                            unsigned int cmd, unsigned long arg)
1698 {
1699         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1700         int error;
1701
1702         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1703                         (mode & FMODE_NDELAY) != 0);
1704         if (error)
1705                 return error;
1706
1707         /*
1708          * Let the static ioctl translation table take care of it.
1709          */
1710         if (!sdev->host->hostt->compat_ioctl)
1711                 return -ENOIOCTLCMD;
1712         return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1713 }
1714 #endif
1715
1716 static char sd_pr_type(enum pr_type type)
1717 {
1718         switch (type) {
1719         case PR_WRITE_EXCLUSIVE:
1720                 return 0x01;
1721         case PR_EXCLUSIVE_ACCESS:
1722                 return 0x03;
1723         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1724                 return 0x05;
1725         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1726                 return 0x06;
1727         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1728                 return 0x07;
1729         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1730                 return 0x08;
1731         default:
1732                 return 0;
1733         }
1734 };
1735
1736 static int sd_pr_command(struct block_device *bdev, u8 sa,
1737                 u64 key, u64 sa_key, u8 type, u8 flags)
1738 {
1739         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1740         struct scsi_sense_hdr sshdr;
1741         int result;
1742         u8 cmd[16] = { 0, };
1743         u8 data[24] = { 0, };
1744
1745         cmd[0] = PERSISTENT_RESERVE_OUT;
1746         cmd[1] = sa;
1747         cmd[2] = type;
1748         put_unaligned_be32(sizeof(data), &cmd[5]);
1749
1750         put_unaligned_be64(key, &data[0]);
1751         put_unaligned_be64(sa_key, &data[8]);
1752         data[20] = flags;
1753
1754         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1755                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1756
1757         if (driver_byte(result) == DRIVER_SENSE &&
1758             scsi_sense_valid(&sshdr)) {
1759                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1760                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1761         }
1762
1763         return result;
1764 }
1765
1766 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1767                 u32 flags)
1768 {
1769         if (flags & ~PR_FL_IGNORE_KEY)
1770                 return -EOPNOTSUPP;
1771         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1772                         old_key, new_key, 0,
1773                         (1 << 0) /* APTPL */);
1774 }
1775
1776 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1777                 u32 flags)
1778 {
1779         if (flags)
1780                 return -EOPNOTSUPP;
1781         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1782 }
1783
1784 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1785 {
1786         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1787 }
1788
1789 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1790                 enum pr_type type, bool abort)
1791 {
1792         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1793                              sd_pr_type(type), 0);
1794 }
1795
1796 static int sd_pr_clear(struct block_device *bdev, u64 key)
1797 {
1798         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1799 }
1800
1801 static const struct pr_ops sd_pr_ops = {
1802         .pr_register    = sd_pr_register,
1803         .pr_reserve     = sd_pr_reserve,
1804         .pr_release     = sd_pr_release,
1805         .pr_preempt     = sd_pr_preempt,
1806         .pr_clear       = sd_pr_clear,
1807 };
1808
1809 static const struct block_device_operations sd_fops = {
1810         .owner                  = THIS_MODULE,
1811         .open                   = sd_open,
1812         .release                = sd_release,
1813         .ioctl                  = sd_ioctl,
1814         .getgeo                 = sd_getgeo,
1815 #ifdef CONFIG_COMPAT
1816         .compat_ioctl           = sd_compat_ioctl,
1817 #endif
1818         .check_events           = sd_check_events,
1819         .revalidate_disk        = sd_revalidate_disk,
1820         .unlock_native_capacity = sd_unlock_native_capacity,
1821         .report_zones           = sd_zbc_report_zones,
1822         .pr_ops                 = &sd_pr_ops,
1823 };
1824
1825 /**
1826  *      sd_eh_reset - reset error handling callback
1827  *      @scmd:          sd-issued command that has failed
1828  *
1829  *      This function is called by the SCSI midlayer before starting
1830  *      SCSI EH. When counting medium access failures we have to be
1831  *      careful to register it only only once per device and SCSI EH run;
1832  *      there might be several timed out commands which will cause the
1833  *      'max_medium_access_timeouts' counter to trigger after the first
1834  *      SCSI EH run already and set the device to offline.
1835  *      So this function resets the internal counter before starting SCSI EH.
1836  **/
1837 static void sd_eh_reset(struct scsi_cmnd *scmd)
1838 {
1839         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1840
1841         /* New SCSI EH run, reset gate variable */
1842         sdkp->ignore_medium_access_errors = false;
1843 }
1844
1845 /**
1846  *      sd_eh_action - error handling callback
1847  *      @scmd:          sd-issued command that has failed
1848  *      @eh_disp:       The recovery disposition suggested by the midlayer
1849  *
1850  *      This function is called by the SCSI midlayer upon completion of an
1851  *      error test command (currently TEST UNIT READY). The result of sending
1852  *      the eh command is passed in eh_disp.  We're looking for devices that
1853  *      fail medium access commands but are OK with non access commands like
1854  *      test unit ready (so wrongly see the device as having a successful
1855  *      recovery)
1856  **/
1857 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1858 {
1859         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1860         struct scsi_device *sdev = scmd->device;
1861
1862         if (!scsi_device_online(sdev) ||
1863             !scsi_medium_access_command(scmd) ||
1864             host_byte(scmd->result) != DID_TIME_OUT ||
1865             eh_disp != SUCCESS)
1866                 return eh_disp;
1867
1868         /*
1869          * The device has timed out executing a medium access command.
1870          * However, the TEST UNIT READY command sent during error
1871          * handling completed successfully. Either the device is in the
1872          * process of recovering or has it suffered an internal failure
1873          * that prevents access to the storage medium.
1874          */
1875         if (!sdkp->ignore_medium_access_errors) {
1876                 sdkp->medium_access_timed_out++;
1877                 sdkp->ignore_medium_access_errors = true;
1878         }
1879
1880         /*
1881          * If the device keeps failing read/write commands but TEST UNIT
1882          * READY always completes successfully we assume that medium
1883          * access is no longer possible and take the device offline.
1884          */
1885         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1886                 scmd_printk(KERN_ERR, scmd,
1887                             "Medium access timeout failure. Offlining disk!\n");
1888                 mutex_lock(&sdev->state_mutex);
1889                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1890                 mutex_unlock(&sdev->state_mutex);
1891
1892                 return SUCCESS;
1893         }
1894
1895         return eh_disp;
1896 }
1897
1898 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1899 {
1900         struct request *req = scmd->request;
1901         struct scsi_device *sdev = scmd->device;
1902         unsigned int transferred, good_bytes;
1903         u64 start_lba, end_lba, bad_lba;
1904
1905         /*
1906          * Some commands have a payload smaller than the device logical
1907          * block size (e.g. INQUIRY on a 4K disk).
1908          */
1909         if (scsi_bufflen(scmd) <= sdev->sector_size)
1910                 return 0;
1911
1912         /* Check if we have a 'bad_lba' information */
1913         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1914                                      SCSI_SENSE_BUFFERSIZE,
1915                                      &bad_lba))
1916                 return 0;
1917
1918         /*
1919          * If the bad lba was reported incorrectly, we have no idea where
1920          * the error is.
1921          */
1922         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1923         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1924         if (bad_lba < start_lba || bad_lba >= end_lba)
1925                 return 0;
1926
1927         /*
1928          * resid is optional but mostly filled in.  When it's unused,
1929          * its value is zero, so we assume the whole buffer transferred
1930          */
1931         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1932
1933         /* This computation should always be done in terms of the
1934          * resolution of the device's medium.
1935          */
1936         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1937
1938         return min(good_bytes, transferred);
1939 }
1940
1941 /**
1942  *      sd_done - bottom half handler: called when the lower level
1943  *      driver has completed (successfully or otherwise) a scsi command.
1944  *      @SCpnt: mid-level's per command structure.
1945  *
1946  *      Note: potentially run from within an ISR. Must not block.
1947  **/
1948 static int sd_done(struct scsi_cmnd *SCpnt)
1949 {
1950         int result = SCpnt->result;
1951         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1952         unsigned int sector_size = SCpnt->device->sector_size;
1953         unsigned int resid;
1954         struct scsi_sense_hdr sshdr;
1955         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1956         struct request *req = SCpnt->request;
1957         int sense_valid = 0;
1958         int sense_deferred = 0;
1959
1960         switch (req_op(req)) {
1961         case REQ_OP_DISCARD:
1962         case REQ_OP_WRITE_ZEROES:
1963         case REQ_OP_WRITE_SAME:
1964         case REQ_OP_ZONE_RESET:
1965                 if (!result) {
1966                         good_bytes = blk_rq_bytes(req);
1967                         scsi_set_resid(SCpnt, 0);
1968                 } else {
1969                         good_bytes = 0;
1970                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1971                 }
1972                 break;
1973         default:
1974                 /*
1975                  * In case of bogus fw or device, we could end up having
1976                  * an unaligned partial completion. Check this here and force
1977                  * alignment.
1978                  */
1979                 resid = scsi_get_resid(SCpnt);
1980                 if (resid & (sector_size - 1)) {
1981                         sd_printk(KERN_INFO, sdkp,
1982                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1983                                 resid, sector_size);
1984                         resid = min(scsi_bufflen(SCpnt),
1985                                     round_up(resid, sector_size));
1986                         scsi_set_resid(SCpnt, resid);
1987                 }
1988         }
1989
1990         if (result) {
1991                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1992                 if (sense_valid)
1993                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1994         }
1995         sdkp->medium_access_timed_out = 0;
1996
1997         if (driver_byte(result) != DRIVER_SENSE &&
1998             (!sense_valid || sense_deferred))
1999                 goto out;
2000
2001         switch (sshdr.sense_key) {
2002         case HARDWARE_ERROR:
2003         case MEDIUM_ERROR:
2004                 good_bytes = sd_completed_bytes(SCpnt);
2005                 break;
2006         case RECOVERED_ERROR:
2007                 good_bytes = scsi_bufflen(SCpnt);
2008                 break;
2009         case NO_SENSE:
2010                 /* This indicates a false check condition, so ignore it.  An
2011                  * unknown amount of data was transferred so treat it as an
2012                  * error.
2013                  */
2014                 SCpnt->result = 0;
2015                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2016                 break;
2017         case ABORTED_COMMAND:
2018                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2019                         good_bytes = sd_completed_bytes(SCpnt);
2020                 break;
2021         case ILLEGAL_REQUEST:
2022                 switch (sshdr.asc) {
2023                 case 0x10:      /* DIX: Host detected corruption */
2024                         good_bytes = sd_completed_bytes(SCpnt);
2025                         break;
2026                 case 0x20:      /* INVALID COMMAND OPCODE */
2027                 case 0x24:      /* INVALID FIELD IN CDB */
2028                         switch (SCpnt->cmnd[0]) {
2029                         case UNMAP:
2030                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2031                                 break;
2032                         case WRITE_SAME_16:
2033                         case WRITE_SAME:
2034                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2035                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2036                                 } else {
2037                                         sdkp->device->no_write_same = 1;
2038                                         sd_config_write_same(sdkp);
2039                                         req->rq_flags |= RQF_QUIET;
2040                                 }
2041                                 break;
2042                         }
2043                 }
2044                 break;
2045         default:
2046                 break;
2047         }
2048
2049  out:
2050         if (sd_is_zoned(sdkp))
2051                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2052
2053         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2054                                            "sd_done: completed %d of %d bytes\n",
2055                                            good_bytes, scsi_bufflen(SCpnt)));
2056
2057         if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt) &&
2058             good_bytes)
2059                 t10_pi_complete(SCpnt->request, sdkp->protection_type,
2060                                 good_bytes / scsi_prot_interval(SCpnt));
2061
2062         return good_bytes;
2063 }
2064
2065 /*
2066  * spinup disk - called only in sd_revalidate_disk()
2067  */
2068 static void
2069 sd_spinup_disk(struct scsi_disk *sdkp)
2070 {
2071         unsigned char cmd[10];
2072         unsigned long spintime_expire = 0;
2073         int retries, spintime;
2074         unsigned int the_result;
2075         struct scsi_sense_hdr sshdr;
2076         int sense_valid = 0;
2077
2078         spintime = 0;
2079
2080         /* Spin up drives, as required.  Only do this at boot time */
2081         /* Spinup needs to be done for module loads too. */
2082         do {
2083                 retries = 0;
2084
2085                 do {
2086                         cmd[0] = TEST_UNIT_READY;
2087                         memset((void *) &cmd[1], 0, 9);
2088
2089                         the_result = scsi_execute_req(sdkp->device, cmd,
2090                                                       DMA_NONE, NULL, 0,
2091                                                       &sshdr, SD_TIMEOUT,
2092                                                       SD_MAX_RETRIES, NULL);
2093
2094                         /*
2095                          * If the drive has indicated to us that it
2096                          * doesn't have any media in it, don't bother
2097                          * with any more polling.
2098                          */
2099                         if (media_not_present(sdkp, &sshdr))
2100                                 return;
2101
2102                         if (the_result)
2103                                 sense_valid = scsi_sense_valid(&sshdr);
2104                         retries++;
2105                 } while (retries < 3 &&
2106                          (!scsi_status_is_good(the_result) ||
2107                           ((driver_byte(the_result) == DRIVER_SENSE) &&
2108                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2109
2110                 if (driver_byte(the_result) != DRIVER_SENSE) {
2111                         /* no sense, TUR either succeeded or failed
2112                          * with a status error */
2113                         if(!spintime && !scsi_status_is_good(the_result)) {
2114                                 sd_print_result(sdkp, "Test Unit Ready failed",
2115                                                 the_result);
2116                         }
2117                         break;
2118                 }
2119
2120                 /*
2121                  * The device does not want the automatic start to be issued.
2122                  */
2123                 if (sdkp->device->no_start_on_add)
2124                         break;
2125
2126                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2127                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2128                                 break;  /* manual intervention required */
2129                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2130                                 break;  /* standby */
2131                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2132                                 break;  /* unavailable */
2133                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2134                                 break;  /* sanitize in progress */
2135                         /*
2136                          * Issue command to spin up drive when not ready
2137                          */
2138                         if (!spintime) {
2139                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2140                                 cmd[0] = START_STOP;
2141                                 cmd[1] = 1;     /* Return immediately */
2142                                 memset((void *) &cmd[2], 0, 8);
2143                                 cmd[4] = 1;     /* Start spin cycle */
2144                                 if (sdkp->device->start_stop_pwr_cond)
2145                                         cmd[4] |= 1 << 4;
2146                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2147                                                  NULL, 0, &sshdr,
2148                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2149                                                  NULL);
2150                                 spintime_expire = jiffies + 100 * HZ;
2151                                 spintime = 1;
2152                         }
2153                         /* Wait 1 second for next try */
2154                         msleep(1000);
2155                         printk(KERN_CONT ".");
2156
2157                 /*
2158                  * Wait for USB flash devices with slow firmware.
2159                  * Yes, this sense key/ASC combination shouldn't
2160                  * occur here.  It's characteristic of these devices.
2161                  */
2162                 } else if (sense_valid &&
2163                                 sshdr.sense_key == UNIT_ATTENTION &&
2164                                 sshdr.asc == 0x28) {
2165                         if (!spintime) {
2166                                 spintime_expire = jiffies + 5 * HZ;
2167                                 spintime = 1;
2168                         }
2169                         /* Wait 1 second for next try */
2170                         msleep(1000);
2171                 } else {
2172                         /* we don't understand the sense code, so it's
2173                          * probably pointless to loop */
2174                         if(!spintime) {
2175                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2176                                 sd_print_sense_hdr(sdkp, &sshdr);
2177                         }
2178                         break;
2179                 }
2180
2181         } while (spintime && time_before_eq(jiffies, spintime_expire));
2182
2183         if (spintime) {
2184                 if (scsi_status_is_good(the_result))
2185                         printk(KERN_CONT "ready\n");
2186                 else
2187                         printk(KERN_CONT "not responding...\n");
2188         }
2189 }
2190
2191 /*
2192  * Determine whether disk supports Data Integrity Field.
2193  */
2194 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2195 {
2196         struct scsi_device *sdp = sdkp->device;
2197         u8 type;
2198         int ret = 0;
2199
2200         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2201                 return ret;
2202
2203         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2204
2205         if (type > T10_PI_TYPE3_PROTECTION)
2206                 ret = -ENODEV;
2207         else if (scsi_host_dif_capable(sdp->host, type))
2208                 ret = 1;
2209
2210         if (sdkp->first_scan || type != sdkp->protection_type)
2211                 switch (ret) {
2212                 case -ENODEV:
2213                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2214                                   " protection type %u. Disabling disk!\n",
2215                                   type);
2216                         break;
2217                 case 1:
2218                         sd_printk(KERN_NOTICE, sdkp,
2219                                   "Enabling DIF Type %u protection\n", type);
2220                         break;
2221                 case 0:
2222                         sd_printk(KERN_NOTICE, sdkp,
2223                                   "Disabling DIF Type %u protection\n", type);
2224                         break;
2225                 }
2226
2227         sdkp->protection_type = type;
2228
2229         return ret;
2230 }
2231
2232 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2233                         struct scsi_sense_hdr *sshdr, int sense_valid,
2234                         int the_result)
2235 {
2236         if (driver_byte(the_result) == DRIVER_SENSE)
2237                 sd_print_sense_hdr(sdkp, sshdr);
2238         else
2239                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2240
2241         /*
2242          * Set dirty bit for removable devices if not ready -
2243          * sometimes drives will not report this properly.
2244          */
2245         if (sdp->removable &&
2246             sense_valid && sshdr->sense_key == NOT_READY)
2247                 set_media_not_present(sdkp);
2248
2249         /*
2250          * We used to set media_present to 0 here to indicate no media
2251          * in the drive, but some drives fail read capacity even with
2252          * media present, so we can't do that.
2253          */
2254         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2255 }
2256
2257 #define RC16_LEN 32
2258 #if RC16_LEN > SD_BUF_SIZE
2259 #error RC16_LEN must not be more than SD_BUF_SIZE
2260 #endif
2261
2262 #define READ_CAPACITY_RETRIES_ON_RESET  10
2263
2264 /*
2265  * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
2266  * and the reported logical block size is bigger than 512 bytes. Note
2267  * that last_sector is a u64 and therefore logical_to_sectors() is not
2268  * applicable.
2269  */
2270 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
2271 {
2272         u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
2273
2274         if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
2275                 return false;
2276
2277         return true;
2278 }
2279
2280 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2281                                                 unsigned char *buffer)
2282 {
2283         unsigned char cmd[16];
2284         struct scsi_sense_hdr sshdr;
2285         int sense_valid = 0;
2286         int the_result;
2287         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2288         unsigned int alignment;
2289         unsigned long long lba;
2290         unsigned sector_size;
2291
2292         if (sdp->no_read_capacity_16)
2293                 return -EINVAL;
2294
2295         do {
2296                 memset(cmd, 0, 16);
2297                 cmd[0] = SERVICE_ACTION_IN_16;
2298                 cmd[1] = SAI_READ_CAPACITY_16;
2299                 cmd[13] = RC16_LEN;
2300                 memset(buffer, 0, RC16_LEN);
2301
2302                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2303                                         buffer, RC16_LEN, &sshdr,
2304                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2305
2306                 if (media_not_present(sdkp, &sshdr))
2307                         return -ENODEV;
2308
2309                 if (the_result) {
2310                         sense_valid = scsi_sense_valid(&sshdr);
2311                         if (sense_valid &&
2312                             sshdr.sense_key == ILLEGAL_REQUEST &&
2313                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2314                             sshdr.ascq == 0x00)
2315                                 /* Invalid Command Operation Code or
2316                                  * Invalid Field in CDB, just retry
2317                                  * silently with RC10 */
2318                                 return -EINVAL;
2319                         if (sense_valid &&
2320                             sshdr.sense_key == UNIT_ATTENTION &&
2321                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2322                                 /* Device reset might occur several times,
2323                                  * give it one more chance */
2324                                 if (--reset_retries > 0)
2325                                         continue;
2326                 }
2327                 retries--;
2328
2329         } while (the_result && retries);
2330
2331         if (the_result) {
2332                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2333                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2334                 return -EINVAL;
2335         }
2336
2337         sector_size = get_unaligned_be32(&buffer[8]);
2338         lba = get_unaligned_be64(&buffer[0]);
2339
2340         if (sd_read_protection_type(sdkp, buffer) < 0) {
2341                 sdkp->capacity = 0;
2342                 return -ENODEV;
2343         }
2344
2345         if (!sd_addressable_capacity(lba, sector_size)) {
2346                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2347                         "kernel compiled with support for large block "
2348                         "devices.\n");
2349                 sdkp->capacity = 0;
2350                 return -EOVERFLOW;
2351         }
2352
2353         /* Logical blocks per physical block exponent */
2354         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2355
2356         /* RC basis */
2357         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2358
2359         /* Lowest aligned logical block */
2360         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2361         blk_queue_alignment_offset(sdp->request_queue, alignment);
2362         if (alignment && sdkp->first_scan)
2363                 sd_printk(KERN_NOTICE, sdkp,
2364                           "physical block alignment offset: %u\n", alignment);
2365
2366         if (buffer[14] & 0x80) { /* LBPME */
2367                 sdkp->lbpme = 1;
2368
2369                 if (buffer[14] & 0x40) /* LBPRZ */
2370                         sdkp->lbprz = 1;
2371
2372                 sd_config_discard(sdkp, SD_LBP_WS16);
2373         }
2374
2375         sdkp->capacity = lba + 1;
2376         return sector_size;
2377 }
2378
2379 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2380                                                 unsigned char *buffer)
2381 {
2382         unsigned char cmd[16];
2383         struct scsi_sense_hdr sshdr;
2384         int sense_valid = 0;
2385         int the_result;
2386         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2387         sector_t lba;
2388         unsigned sector_size;
2389
2390         do {
2391                 cmd[0] = READ_CAPACITY;
2392                 memset(&cmd[1], 0, 9);
2393                 memset(buffer, 0, 8);
2394
2395                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2396                                         buffer, 8, &sshdr,
2397                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2398
2399                 if (media_not_present(sdkp, &sshdr))
2400                         return -ENODEV;
2401
2402                 if (the_result) {
2403                         sense_valid = scsi_sense_valid(&sshdr);
2404                         if (sense_valid &&
2405                             sshdr.sense_key == UNIT_ATTENTION &&
2406                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2407                                 /* Device reset might occur several times,
2408                                  * give it one more chance */
2409                                 if (--reset_retries > 0)
2410                                         continue;
2411                 }
2412                 retries--;
2413
2414         } while (the_result && retries);
2415
2416         if (the_result) {
2417                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2418                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2419                 return -EINVAL;
2420         }
2421
2422         sector_size = get_unaligned_be32(&buffer[4]);
2423         lba = get_unaligned_be32(&buffer[0]);
2424
2425         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2426                 /* Some buggy (usb cardreader) devices return an lba of
2427                    0xffffffff when the want to report a size of 0 (with
2428                    which they really mean no media is present) */
2429                 sdkp->capacity = 0;
2430                 sdkp->physical_block_size = sector_size;
2431                 return sector_size;
2432         }
2433
2434         if (!sd_addressable_capacity(lba, sector_size)) {
2435                 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2436                         "kernel compiled with support for large block "
2437                         "devices.\n");
2438                 sdkp->capacity = 0;
2439                 return -EOVERFLOW;
2440         }
2441
2442         sdkp->capacity = lba + 1;
2443         sdkp->physical_block_size = sector_size;
2444         return sector_size;
2445 }
2446
2447 static int sd_try_rc16_first(struct scsi_device *sdp)
2448 {
2449         if (sdp->host->max_cmd_len < 16)
2450                 return 0;
2451         if (sdp->try_rc_10_first)
2452                 return 0;
2453         if (sdp->scsi_level > SCSI_SPC_2)
2454                 return 1;
2455         if (scsi_device_protection(sdp))
2456                 return 1;
2457         return 0;
2458 }
2459
2460 /*
2461  * read disk capacity
2462  */
2463 static void
2464 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2465 {
2466         int sector_size;
2467         struct scsi_device *sdp = sdkp->device;
2468
2469         if (sd_try_rc16_first(sdp)) {
2470                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2471                 if (sector_size == -EOVERFLOW)
2472                         goto got_data;
2473                 if (sector_size == -ENODEV)
2474                         return;
2475                 if (sector_size < 0)
2476                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2477                 if (sector_size < 0)
2478                         return;
2479         } else {
2480                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2481                 if (sector_size == -EOVERFLOW)
2482                         goto got_data;
2483                 if (sector_size < 0)
2484                         return;
2485                 if ((sizeof(sdkp->capacity) > 4) &&
2486                     (sdkp->capacity > 0xffffffffULL)) {
2487                         int old_sector_size = sector_size;
2488                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2489                                         "Trying to use READ CAPACITY(16).\n");
2490                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2491                         if (sector_size < 0) {
2492                                 sd_printk(KERN_NOTICE, sdkp,
2493                                         "Using 0xffffffff as device size\n");
2494                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2495                                 sector_size = old_sector_size;
2496                                 goto got_data;
2497                         }
2498                         /* Remember that READ CAPACITY(16) succeeded */
2499                         sdp->try_rc_10_first = 0;
2500                 }
2501         }
2502
2503         /* Some devices are known to return the total number of blocks,
2504          * not the highest block number.  Some devices have versions
2505          * which do this and others which do not.  Some devices we might
2506          * suspect of doing this but we don't know for certain.
2507          *
2508          * If we know the reported capacity is wrong, decrement it.  If
2509          * we can only guess, then assume the number of blocks is even
2510          * (usually true but not always) and err on the side of lowering
2511          * the capacity.
2512          */
2513         if (sdp->fix_capacity ||
2514             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2515                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2516                                 "from its reported value: %llu\n",
2517                                 (unsigned long long) sdkp->capacity);
2518                 --sdkp->capacity;
2519         }
2520
2521 got_data:
2522         if (sector_size == 0) {
2523                 sector_size = 512;
2524                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2525                           "assuming 512.\n");
2526         }
2527
2528         if (sector_size != 512 &&
2529             sector_size != 1024 &&
2530             sector_size != 2048 &&
2531             sector_size != 4096) {
2532                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2533                           sector_size);
2534                 /*
2535                  * The user might want to re-format the drive with
2536                  * a supported sectorsize.  Once this happens, it
2537                  * would be relatively trivial to set the thing up.
2538                  * For this reason, we leave the thing in the table.
2539                  */
2540                 sdkp->capacity = 0;
2541                 /*
2542                  * set a bogus sector size so the normal read/write
2543                  * logic in the block layer will eventually refuse any
2544                  * request on this device without tripping over power
2545                  * of two sector size assumptions
2546                  */
2547                 sector_size = 512;
2548         }
2549         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2550         blk_queue_physical_block_size(sdp->request_queue,
2551                                       sdkp->physical_block_size);
2552         sdkp->device->sector_size = sector_size;
2553
2554         if (sdkp->capacity > 0xffffffff)
2555                 sdp->use_16_for_rw = 1;
2556
2557 }
2558
2559 /*
2560  * Print disk capacity
2561  */
2562 static void
2563 sd_print_capacity(struct scsi_disk *sdkp,
2564                   sector_t old_capacity)
2565 {
2566         int sector_size = sdkp->device->sector_size;
2567         char cap_str_2[10], cap_str_10[10];
2568
2569         if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2570                 return;
2571
2572         string_get_size(sdkp->capacity, sector_size,
2573                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2574         string_get_size(sdkp->capacity, sector_size,
2575                         STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
2576
2577         sd_printk(KERN_NOTICE, sdkp,
2578                   "%llu %d-byte logical blocks: (%s/%s)\n",
2579                   (unsigned long long)sdkp->capacity,
2580                   sector_size, cap_str_10, cap_str_2);
2581
2582         if (sdkp->physical_block_size != sector_size)
2583                 sd_printk(KERN_NOTICE, sdkp,
2584                           "%u-byte physical blocks\n",
2585                           sdkp->physical_block_size);
2586
2587         sd_zbc_print_zones(sdkp);
2588 }
2589
2590 /* called with buffer of length 512 */
2591 static inline int
2592 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2593                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2594                  struct scsi_sense_hdr *sshdr)
2595 {
2596         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2597                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2598                                sshdr);
2599 }
2600
2601 /*
2602  * read write protect setting, if possible - called only in sd_revalidate_disk()
2603  * called with buffer of length SD_BUF_SIZE
2604  */
2605 static void
2606 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2607 {
2608         int res;
2609         struct scsi_device *sdp = sdkp->device;
2610         struct scsi_mode_data data;
2611         int disk_ro = get_disk_ro(sdkp->disk);
2612         int old_wp = sdkp->write_prot;
2613
2614         set_disk_ro(sdkp->disk, 0);
2615         if (sdp->skip_ms_page_3f) {
2616                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2617                 return;
2618         }
2619
2620         if (sdp->use_192_bytes_for_3f) {
2621                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2622         } else {
2623                 /*
2624                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2625                  * We have to start carefully: some devices hang if we ask
2626                  * for more than is available.
2627                  */
2628                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2629
2630                 /*
2631                  * Second attempt: ask for page 0 When only page 0 is
2632                  * implemented, a request for page 3F may return Sense Key
2633                  * 5: Illegal Request, Sense Code 24: Invalid field in
2634                  * CDB.
2635                  */
2636                 if (!scsi_status_is_good(res))
2637                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2638
2639                 /*
2640                  * Third attempt: ask 255 bytes, as we did earlier.
2641                  */
2642                 if (!scsi_status_is_good(res))
2643                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2644                                                &data, NULL);
2645         }
2646
2647         if (!scsi_status_is_good(res)) {
2648                 sd_first_printk(KERN_WARNING, sdkp,
2649                           "Test WP failed, assume Write Enabled\n");
2650         } else {
2651                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2652                 set_disk_ro(sdkp->disk, sdkp->write_prot || disk_ro);
2653                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2654                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2655                                   sdkp->write_prot ? "on" : "off");
2656                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2657                 }
2658         }
2659 }
2660
2661 /*
2662  * sd_read_cache_type - called only from sd_revalidate_disk()
2663  * called with buffer of length SD_BUF_SIZE
2664  */
2665 static void
2666 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2667 {
2668         int len = 0, res;
2669         struct scsi_device *sdp = sdkp->device;
2670
2671         int dbd;
2672         int modepage;
2673         int first_len;
2674         struct scsi_mode_data data;
2675         struct scsi_sense_hdr sshdr;
2676         int old_wce = sdkp->WCE;
2677         int old_rcd = sdkp->RCD;
2678         int old_dpofua = sdkp->DPOFUA;
2679
2680
2681         if (sdkp->cache_override)
2682                 return;
2683
2684         first_len = 4;
2685         if (sdp->skip_ms_page_8) {
2686                 if (sdp->type == TYPE_RBC)
2687                         goto defaults;
2688                 else {
2689                         if (sdp->skip_ms_page_3f)
2690                                 goto defaults;
2691                         modepage = 0x3F;
2692                         if (sdp->use_192_bytes_for_3f)
2693                                 first_len = 192;
2694                         dbd = 0;
2695                 }
2696         } else if (sdp->type == TYPE_RBC) {
2697                 modepage = 6;
2698                 dbd = 8;
2699         } else {
2700                 modepage = 8;
2701                 dbd = 0;
2702         }
2703
2704         /* cautiously ask */
2705         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2706                         &data, &sshdr);
2707
2708         if (!scsi_status_is_good(res))
2709                 goto bad_sense;
2710
2711         if (!data.header_length) {
2712                 modepage = 6;
2713                 first_len = 0;
2714                 sd_first_printk(KERN_ERR, sdkp,
2715                                 "Missing header in MODE_SENSE response\n");
2716         }
2717
2718         /* that went OK, now ask for the proper length */
2719         len = data.length;
2720
2721         /*
2722          * We're only interested in the first three bytes, actually.
2723          * But the data cache page is defined for the first 20.
2724          */
2725         if (len < 3)
2726                 goto bad_sense;
2727         else if (len > SD_BUF_SIZE) {
2728                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2729                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2730                 len = SD_BUF_SIZE;
2731         }
2732         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2733                 len = 192;
2734
2735         /* Get the data */
2736         if (len > first_len)
2737                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2738                                 &data, &sshdr);
2739
2740         if (scsi_status_is_good(res)) {
2741                 int offset = data.header_length + data.block_descriptor_length;
2742
2743                 while (offset < len) {
2744                         u8 page_code = buffer[offset] & 0x3F;
2745                         u8 spf       = buffer[offset] & 0x40;
2746
2747                         if (page_code == 8 || page_code == 6) {
2748                                 /* We're interested only in the first 3 bytes.
2749                                  */
2750                                 if (len - offset <= 2) {
2751                                         sd_first_printk(KERN_ERR, sdkp,
2752                                                 "Incomplete mode parameter "
2753                                                         "data\n");
2754                                         goto defaults;
2755                                 } else {
2756                                         modepage = page_code;
2757                                         goto Page_found;
2758                                 }
2759                         } else {
2760                                 /* Go to the next page */
2761                                 if (spf && len - offset > 3)
2762                                         offset += 4 + (buffer[offset+2] << 8) +
2763                                                 buffer[offset+3];
2764                                 else if (!spf && len - offset > 1)
2765                                         offset += 2 + buffer[offset+1];
2766                                 else {
2767                                         sd_first_printk(KERN_ERR, sdkp,
2768                                                         "Incomplete mode "
2769                                                         "parameter data\n");
2770                                         goto defaults;
2771                                 }
2772                         }
2773                 }
2774
2775                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2776                 goto defaults;
2777
2778         Page_found:
2779                 if (modepage == 8) {
2780                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2781                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2782                 } else {
2783                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2784                         sdkp->RCD = 0;
2785                 }
2786
2787                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2788                 if (sdp->broken_fua) {
2789                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2790                         sdkp->DPOFUA = 0;
2791                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2792                            !sdkp->device->use_16_for_rw) {
2793                         sd_first_printk(KERN_NOTICE, sdkp,
2794                                   "Uses READ/WRITE(6), disabling FUA\n");
2795                         sdkp->DPOFUA = 0;
2796                 }
2797
2798                 /* No cache flush allowed for write protected devices */
2799                 if (sdkp->WCE && sdkp->write_prot)
2800                         sdkp->WCE = 0;
2801
2802                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2803                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2804                         sd_printk(KERN_NOTICE, sdkp,
2805                                   "Write cache: %s, read cache: %s, %s\n",
2806                                   sdkp->WCE ? "enabled" : "disabled",
2807                                   sdkp->RCD ? "disabled" : "enabled",
2808                                   sdkp->DPOFUA ? "supports DPO and FUA"
2809                                   : "doesn't support DPO or FUA");
2810
2811                 return;
2812         }
2813
2814 bad_sense:
2815         if (scsi_sense_valid(&sshdr) &&
2816             sshdr.sense_key == ILLEGAL_REQUEST &&
2817             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2818                 /* Invalid field in CDB */
2819                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2820         else
2821                 sd_first_printk(KERN_ERR, sdkp,
2822                                 "Asking for cache data failed\n");
2823
2824 defaults:
2825         if (sdp->wce_default_on) {
2826                 sd_first_printk(KERN_NOTICE, sdkp,
2827                                 "Assuming drive cache: write back\n");
2828                 sdkp->WCE = 1;
2829         } else {
2830                 sd_first_printk(KERN_ERR, sdkp,
2831                                 "Assuming drive cache: write through\n");
2832                 sdkp->WCE = 0;
2833         }
2834         sdkp->RCD = 0;
2835         sdkp->DPOFUA = 0;
2836 }
2837
2838 /*
2839  * The ATO bit indicates whether the DIF application tag is available
2840  * for use by the operating system.
2841  */
2842 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2843 {
2844         int res, offset;
2845         struct scsi_device *sdp = sdkp->device;
2846         struct scsi_mode_data data;
2847         struct scsi_sense_hdr sshdr;
2848
2849         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2850                 return;
2851
2852         if (sdkp->protection_type == 0)
2853                 return;
2854
2855         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2856                               SD_MAX_RETRIES, &data, &sshdr);
2857
2858         if (!scsi_status_is_good(res) || !data.header_length ||
2859             data.length < 6) {
2860                 sd_first_printk(KERN_WARNING, sdkp,
2861                           "getting Control mode page failed, assume no ATO\n");
2862
2863                 if (scsi_sense_valid(&sshdr))
2864                         sd_print_sense_hdr(sdkp, &sshdr);
2865
2866                 return;
2867         }
2868
2869         offset = data.header_length + data.block_descriptor_length;
2870
2871         if ((buffer[offset] & 0x3f) != 0x0a) {
2872                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2873                 return;
2874         }
2875
2876         if ((buffer[offset + 5] & 0x80) == 0)
2877                 return;
2878
2879         sdkp->ATO = 1;
2880
2881         return;
2882 }
2883
2884 /**
2885  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2886  * @sdkp: disk to query
2887  */
2888 static void sd_read_block_limits(struct scsi_disk *sdkp)
2889 {
2890         unsigned int sector_sz = sdkp->device->sector_size;
2891         const int vpd_len = 64;
2892         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2893
2894         if (!buffer ||
2895             /* Block Limits VPD */
2896             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2897                 goto out;
2898
2899         blk_queue_io_min(sdkp->disk->queue,
2900                          get_unaligned_be16(&buffer[6]) * sector_sz);
2901
2902         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2903         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2904
2905         if (buffer[3] == 0x3c) {
2906                 unsigned int lba_count, desc_count;
2907
2908                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2909
2910                 if (!sdkp->lbpme)
2911                         goto out;
2912
2913                 lba_count = get_unaligned_be32(&buffer[20]);
2914                 desc_count = get_unaligned_be32(&buffer[24]);
2915
2916                 if (lba_count && desc_count)
2917                         sdkp->max_unmap_blocks = lba_count;
2918
2919                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2920
2921                 if (buffer[32] & 0x80)
2922                         sdkp->unmap_alignment =
2923                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2924
2925                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2926
2927                         if (sdkp->max_unmap_blocks)
2928                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2929                         else
2930                                 sd_config_discard(sdkp, SD_LBP_WS16);
2931
2932                 } else {        /* LBP VPD page tells us what to use */
2933                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2934                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2935                         else if (sdkp->lbpws)
2936                                 sd_config_discard(sdkp, SD_LBP_WS16);
2937                         else if (sdkp->lbpws10)
2938                                 sd_config_discard(sdkp, SD_LBP_WS10);
2939                         else
2940                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2941                 }
2942         }
2943
2944  out:
2945         kfree(buffer);
2946 }
2947
2948 /**
2949  * sd_read_block_characteristics - Query block dev. characteristics
2950  * @sdkp: disk to query
2951  */
2952 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2953 {
2954         struct request_queue *q = sdkp->disk->queue;
2955         unsigned char *buffer;
2956         u16 rot;
2957         const int vpd_len = 64;
2958
2959         buffer = kmalloc(vpd_len, GFP_KERNEL);
2960
2961         if (!buffer ||
2962             /* Block Device Characteristics VPD */
2963             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2964                 goto out;
2965
2966         rot = get_unaligned_be16(&buffer[4]);
2967
2968         if (rot == 1) {
2969                 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2970                 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2971         }
2972
2973         if (sdkp->device->type == TYPE_ZBC) {
2974                 /* Host-managed */
2975                 q->limits.zoned = BLK_ZONED_HM;
2976         } else {
2977                 sdkp->zoned = (buffer[8] >> 4) & 3;
2978                 if (sdkp->zoned == 1)
2979                         /* Host-aware */
2980                         q->limits.zoned = BLK_ZONED_HA;
2981                 else
2982                         /*
2983                          * Treat drive-managed devices as
2984                          * regular block devices.
2985                          */
2986                         q->limits.zoned = BLK_ZONED_NONE;
2987         }
2988         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2989                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2990                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2991
2992  out:
2993         kfree(buffer);
2994 }
2995
2996 /**
2997  * sd_read_block_provisioning - Query provisioning VPD page
2998  * @sdkp: disk to query
2999  */
3000 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
3001 {
3002         unsigned char *buffer;
3003         const int vpd_len = 8;
3004
3005         if (sdkp->lbpme == 0)
3006                 return;
3007
3008         buffer = kmalloc(vpd_len, GFP_KERNEL);
3009
3010         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
3011                 goto out;
3012
3013         sdkp->lbpvpd    = 1;
3014         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
3015         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
3016         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
3017
3018  out:
3019         kfree(buffer);
3020 }
3021
3022 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3023 {
3024         struct scsi_device *sdev = sdkp->device;
3025
3026         if (sdev->host->no_write_same) {
3027                 sdev->no_write_same = 1;
3028
3029                 return;
3030         }
3031
3032         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
3033                 /* too large values might cause issues with arcmsr */
3034                 int vpd_buf_len = 64;
3035
3036                 sdev->no_report_opcodes = 1;
3037
3038                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3039                  * CODES is unsupported and the device has an ATA
3040                  * Information VPD page (SAT).
3041                  */
3042                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3043                         sdev->no_write_same = 1;
3044         }
3045
3046         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3047                 sdkp->ws16 = 1;
3048
3049         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3050                 sdkp->ws10 = 1;
3051 }
3052
3053 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3054 {
3055         struct scsi_device *sdev = sdkp->device;
3056
3057         if (!sdev->security_supported)
3058                 return;
3059
3060         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3061                         SECURITY_PROTOCOL_IN) == 1 &&
3062             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3063                         SECURITY_PROTOCOL_OUT) == 1)
3064                 sdkp->security = 1;
3065 }
3066
3067 /*
3068  * Determine the device's preferred I/O size for reads and writes
3069  * unless the reported value is unreasonably small, large, not a
3070  * multiple of the physical block size, or simply garbage.
3071  */
3072 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3073                                       unsigned int dev_max)
3074 {
3075         struct scsi_device *sdp = sdkp->device;
3076         unsigned int opt_xfer_bytes =
3077                 logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3078
3079         if (sdkp->opt_xfer_blocks > dev_max) {
3080                 sd_first_printk(KERN_WARNING, sdkp,
3081                                 "Optimal transfer size %u logical blocks " \
3082                                 "> dev_max (%u logical blocks)\n",
3083                                 sdkp->opt_xfer_blocks, dev_max);
3084                 return false;
3085         }
3086
3087         if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3088                 sd_first_printk(KERN_WARNING, sdkp,
3089                                 "Optimal transfer size %u logical blocks " \
3090                                 "> sd driver limit (%u logical blocks)\n",
3091                                 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3092                 return false;
3093         }
3094
3095         if (opt_xfer_bytes < PAGE_SIZE) {
3096                 sd_first_printk(KERN_WARNING, sdkp,
3097                                 "Optimal transfer size %u bytes < " \
3098                                 "PAGE_SIZE (%u bytes)\n",
3099                                 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3100                 return false;
3101         }
3102
3103         if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3104                 sd_first_printk(KERN_WARNING, sdkp,
3105                                 "Optimal transfer size %u bytes not a " \
3106                                 "multiple of physical block size (%u bytes)\n",
3107                                 opt_xfer_bytes, sdkp->physical_block_size);
3108                 return false;
3109         }
3110
3111         sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3112                         opt_xfer_bytes);
3113         return true;
3114 }
3115
3116 /**
3117  *      sd_revalidate_disk - called the first time a new disk is seen,
3118  *      performs disk spin up, read_capacity, etc.
3119  *      @disk: struct gendisk we care about
3120  **/
3121 static int sd_revalidate_disk(struct gendisk *disk)
3122 {
3123         struct scsi_disk *sdkp = scsi_disk(disk);
3124         struct scsi_device *sdp = sdkp->device;
3125         struct request_queue *q = sdkp->disk->queue;
3126         sector_t old_capacity = sdkp->capacity;
3127         unsigned char *buffer;
3128         unsigned int dev_max, rw_max;
3129
3130         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3131                                       "sd_revalidate_disk\n"));
3132
3133         /*
3134          * If the device is offline, don't try and read capacity or any
3135          * of the other niceties.
3136          */
3137         if (!scsi_device_online(sdp))
3138                 goto out;
3139
3140         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3141         if (!buffer) {
3142                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3143                           "allocation failure.\n");
3144                 goto out;
3145         }
3146
3147         sd_spinup_disk(sdkp);
3148
3149         /*
3150          * Without media there is no reason to ask; moreover, some devices
3151          * react badly if we do.
3152          */
3153         if (sdkp->media_present) {
3154                 sd_read_capacity(sdkp, buffer);
3155
3156                 /*
3157                  * set the default to rotational.  All non-rotational devices
3158                  * support the block characteristics VPD page, which will
3159                  * cause this to be updated correctly and any device which
3160                  * doesn't support it should be treated as rotational.
3161                  */
3162                 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
3163                 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
3164
3165                 if (scsi_device_supports_vpd(sdp)) {
3166                         sd_read_block_provisioning(sdkp);
3167                         sd_read_block_limits(sdkp);
3168                         sd_read_block_characteristics(sdkp);
3169                         sd_zbc_read_zones(sdkp, buffer);
3170                 }
3171
3172                 sd_print_capacity(sdkp, old_capacity);
3173
3174                 sd_read_write_protect_flag(sdkp, buffer);
3175                 sd_read_cache_type(sdkp, buffer);
3176                 sd_read_app_tag_own(sdkp, buffer);
3177                 sd_read_write_same(sdkp, buffer);
3178                 sd_read_security(sdkp, buffer);
3179         }
3180
3181         /*
3182          * We now have all cache related info, determine how we deal
3183          * with flush requests.
3184          */
3185         sd_set_flush_flag(sdkp);
3186
3187         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3188         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3189
3190         /* Some devices report a maximum block count for READ/WRITE requests. */
3191         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3192         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3193
3194         if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3195                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3196                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3197         } else
3198                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3199                                       (sector_t)BLK_DEF_MAX_SECTORS);
3200
3201         /* Do not exceed controller limit */
3202         rw_max = min(rw_max, queue_max_hw_sectors(q));
3203
3204         /*
3205          * Only update max_sectors if previously unset or if the current value
3206          * exceeds the capabilities of the hardware.
3207          */
3208         if (sdkp->first_scan ||
3209             q->limits.max_sectors > q->limits.max_dev_sectors ||
3210             q->limits.max_sectors > q->limits.max_hw_sectors)
3211                 q->limits.max_sectors = rw_max;
3212
3213         sdkp->first_scan = 0;
3214
3215         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3216         sd_config_write_same(sdkp);
3217         kfree(buffer);
3218
3219  out:
3220         return 0;
3221 }
3222
3223 /**
3224  *      sd_unlock_native_capacity - unlock native capacity
3225  *      @disk: struct gendisk to set capacity for
3226  *
3227  *      Block layer calls this function if it detects that partitions
3228  *      on @disk reach beyond the end of the device.  If the SCSI host
3229  *      implements ->unlock_native_capacity() method, it's invoked to
3230  *      give it a chance to adjust the device capacity.
3231  *
3232  *      CONTEXT:
3233  *      Defined by block layer.  Might sleep.
3234  */
3235 static void sd_unlock_native_capacity(struct gendisk *disk)
3236 {
3237         struct scsi_device *sdev = scsi_disk(disk)->device;
3238
3239         if (sdev->host->hostt->unlock_native_capacity)
3240                 sdev->host->hostt->unlock_native_capacity(sdev);
3241 }
3242
3243 /**
3244  *      sd_format_disk_name - format disk name
3245  *      @prefix: name prefix - ie. "sd" for SCSI disks
3246  *      @index: index of the disk to format name for
3247  *      @buf: output buffer
3248  *      @buflen: length of the output buffer
3249  *
3250  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3251  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3252  *      which is followed by sdaaa.
3253  *
3254  *      This is basically 26 base counting with one extra 'nil' entry
3255  *      at the beginning from the second digit on and can be
3256  *      determined using similar method as 26 base conversion with the
3257  *      index shifted -1 after each digit is computed.
3258  *
3259  *      CONTEXT:
3260  *      Don't care.
3261  *
3262  *      RETURNS:
3263  *      0 on success, -errno on failure.
3264  */
3265 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3266 {
3267         const int base = 'z' - 'a' + 1;
3268         char *begin = buf + strlen(prefix);
3269         char *end = buf + buflen;
3270         char *p;
3271         int unit;
3272
3273         p = end - 1;
3274         *p = '\0';
3275         unit = base;
3276         do {
3277                 if (p == begin)
3278                         return -EINVAL;
3279                 *--p = 'a' + (index % unit);
3280                 index = (index / unit) - 1;
3281         } while (index >= 0);
3282
3283         memmove(begin, p, end - p);
3284         memcpy(buf, prefix, strlen(prefix));
3285
3286         return 0;
3287 }
3288
3289 /*
3290  * The asynchronous part of sd_probe
3291  */
3292 static void sd_probe_async(void *data, async_cookie_t cookie)
3293 {
3294         struct scsi_disk *sdkp = data;
3295         struct scsi_device *sdp;
3296         struct gendisk *gd;
3297         u32 index;
3298         struct device *dev;
3299
3300         sdp = sdkp->device;
3301         gd = sdkp->disk;
3302         index = sdkp->index;
3303         dev = &sdp->sdev_gendev;
3304
3305         gd->major = sd_major((index & 0xf0) >> 4);
3306         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3307
3308         gd->fops = &sd_fops;
3309         gd->private_data = &sdkp->driver;
3310         gd->queue = sdkp->device->request_queue;
3311
3312         /* defaults, until the device tells us otherwise */
3313         sdp->sector_size = 512;
3314         sdkp->capacity = 0;
3315         sdkp->media_present = 1;
3316         sdkp->write_prot = 0;
3317         sdkp->cache_override = 0;
3318         sdkp->WCE = 0;
3319         sdkp->RCD = 0;
3320         sdkp->ATO = 0;
3321         sdkp->first_scan = 1;
3322         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3323
3324         sd_revalidate_disk(gd);
3325
3326         gd->flags = GENHD_FL_EXT_DEVT;
3327         if (sdp->removable) {
3328                 gd->flags |= GENHD_FL_REMOVABLE;
3329                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3330         }
3331
3332         blk_pm_runtime_init(sdp->request_queue, dev);
3333         device_add_disk(dev, gd, NULL);
3334         if (sdkp->capacity)
3335                 sd_dif_config_host(sdkp);
3336
3337         sd_revalidate_disk(gd);
3338
3339         if (sdkp->security) {
3340                 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3341                 if (sdkp->opal_dev)
3342                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3343         }
3344
3345         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3346                   sdp->removable ? "removable " : "");
3347         scsi_autopm_put_device(sdp);
3348         put_device(&sdkp->dev);
3349 }
3350
3351 /**
3352  *      sd_probe - called during driver initialization and whenever a
3353  *      new scsi device is attached to the system. It is called once
3354  *      for each scsi device (not just disks) present.
3355  *      @dev: pointer to device object
3356  *
3357  *      Returns 0 if successful (or not interested in this scsi device
3358  *      (e.g. scanner)); 1 when there is an error.
3359  *
3360  *      Note: this function is invoked from the scsi mid-level.
3361  *      This function sets up the mapping between a given
3362  *      <host,channel,id,lun> (found in sdp) and new device name
3363  *      (e.g. /dev/sda). More precisely it is the block device major
3364  *      and minor number that is chosen here.
3365  *
3366  *      Assume sd_probe is not re-entrant (for time being)
3367  *      Also think about sd_probe() and sd_remove() running coincidentally.
3368  **/
3369 static int sd_probe(struct device *dev)
3370 {
3371         struct scsi_device *sdp = to_scsi_device(dev);
3372         struct scsi_disk *sdkp;
3373         struct gendisk *gd;
3374         int index;
3375         int error;
3376
3377         scsi_autopm_get_device(sdp);
3378         error = -ENODEV;
3379         if (sdp->type != TYPE_DISK &&
3380             sdp->type != TYPE_ZBC &&
3381             sdp->type != TYPE_MOD &&
3382             sdp->type != TYPE_RBC)
3383                 goto out;
3384
3385 #ifndef CONFIG_BLK_DEV_ZONED
3386         if (sdp->type == TYPE_ZBC)
3387                 goto out;
3388 #endif
3389         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3390                                         "sd_probe\n"));
3391
3392         error = -ENOMEM;
3393         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3394         if (!sdkp)
3395                 goto out;
3396
3397         gd = alloc_disk(SD_MINORS);
3398         if (!gd)
3399                 goto out_free;
3400
3401         index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3402         if (index < 0) {
3403                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3404                 goto out_put;
3405         }
3406
3407         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3408         if (error) {
3409                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3410                 goto out_free_index;
3411         }
3412
3413         sdkp->device = sdp;
3414         sdkp->driver = &sd_template;
3415         sdkp->disk = gd;
3416         sdkp->index = index;
3417         atomic_set(&sdkp->openers, 0);
3418         atomic_set(&sdkp->device->ioerr_cnt, 0);
3419
3420         if (!sdp->request_queue->rq_timeout) {
3421                 if (sdp->type != TYPE_MOD)
3422                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3423                 else
3424                         blk_queue_rq_timeout(sdp->request_queue,
3425                                              SD_MOD_TIMEOUT);
3426         }
3427
3428         device_initialize(&sdkp->dev);
3429         sdkp->dev.parent = dev;
3430         sdkp->dev.class = &sd_disk_class;
3431         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3432
3433         error = device_add(&sdkp->dev);
3434         if (error)
3435                 goto out_free_index;
3436
3437         get_device(dev);
3438         dev_set_drvdata(dev, sdkp);
3439
3440         get_device(&sdkp->dev); /* prevent release before async_schedule */
3441         async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3442
3443         return 0;
3444
3445  out_free_index:
3446         ida_free(&sd_index_ida, index);
3447  out_put:
3448         put_disk(gd);
3449  out_free:
3450         kfree(sdkp);
3451  out:
3452         scsi_autopm_put_device(sdp);
3453         return error;
3454 }
3455
3456 /**
3457  *      sd_remove - called whenever a scsi disk (previously recognized by
3458  *      sd_probe) is detached from the system. It is called (potentially
3459  *      multiple times) during sd module unload.
3460  *      @dev: pointer to device object
3461  *
3462  *      Note: this function is invoked from the scsi mid-level.
3463  *      This function potentially frees up a device name (e.g. /dev/sdc)
3464  *      that could be re-used by a subsequent sd_probe().
3465  *      This function is not called when the built-in sd driver is "exit-ed".
3466  **/
3467 static int sd_remove(struct device *dev)
3468 {
3469         struct scsi_disk *sdkp;
3470         dev_t devt;
3471
3472         sdkp = dev_get_drvdata(dev);
3473         devt = disk_devt(sdkp->disk);
3474         scsi_autopm_get_device(sdkp->device);
3475
3476         async_synchronize_full_domain(&scsi_sd_pm_domain);
3477         async_synchronize_full_domain(&scsi_sd_probe_domain);
3478         device_del(&sdkp->dev);
3479         del_gendisk(sdkp->disk);
3480         sd_shutdown(dev);
3481
3482         free_opal_dev(sdkp->opal_dev);
3483
3484         blk_register_region(devt, SD_MINORS, NULL,
3485                             sd_default_probe, NULL, NULL);
3486
3487         mutex_lock(&sd_ref_mutex);
3488         dev_set_drvdata(dev, NULL);
3489         put_device(&sdkp->dev);
3490         mutex_unlock(&sd_ref_mutex);
3491
3492         return 0;
3493 }
3494
3495 /**
3496  *      scsi_disk_release - Called to free the scsi_disk structure
3497  *      @dev: pointer to embedded class device
3498  *
3499  *      sd_ref_mutex must be held entering this routine.  Because it is
3500  *      called on last put, you should always use the scsi_disk_get()
3501  *      scsi_disk_put() helpers which manipulate the semaphore directly
3502  *      and never do a direct put_device.
3503  **/
3504 static void scsi_disk_release(struct device *dev)
3505 {
3506         struct scsi_disk *sdkp = to_scsi_disk(dev);
3507         struct gendisk *disk = sdkp->disk;
3508
3509         ida_free(&sd_index_ida, sdkp->index);
3510
3511         disk->private_data = NULL;
3512         put_disk(disk);
3513         put_device(&sdkp->device->sdev_gendev);
3514
3515         kfree(sdkp);
3516 }
3517
3518 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3519 {
3520         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3521         struct scsi_sense_hdr sshdr;
3522         struct scsi_device *sdp = sdkp->device;
3523         int res;
3524
3525         if (start)
3526                 cmd[4] |= 1;    /* START */
3527
3528         if (sdp->start_stop_pwr_cond)
3529                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3530
3531         if (!scsi_device_online(sdp))
3532                 return -ENODEV;
3533
3534         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3535                         SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3536         if (res) {
3537                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3538                 if (driver_byte(res) == DRIVER_SENSE)
3539                         sd_print_sense_hdr(sdkp, &sshdr);
3540                 if (scsi_sense_valid(&sshdr) &&
3541                         /* 0x3a is medium not present */
3542                         sshdr.asc == 0x3a)
3543                         res = 0;
3544         }
3545
3546         /* SCSI error codes must not go to the generic layer */
3547         if (res)
3548                 return -EIO;
3549
3550         return 0;
3551 }
3552
3553 /*
3554  * Send a SYNCHRONIZE CACHE instruction down to the device through
3555  * the normal SCSI command structure.  Wait for the command to
3556  * complete.
3557  */
3558 static void sd_shutdown(struct device *dev)
3559 {
3560         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3561
3562         if (!sdkp)
3563                 return;         /* this can happen */
3564
3565         if (pm_runtime_suspended(dev))
3566                 return;
3567
3568         if (sdkp->WCE && sdkp->media_present) {
3569                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3570                 sd_sync_cache(sdkp, NULL);
3571         }
3572
3573         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3574                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3575                 sd_start_stop_device(sdkp, 0);
3576         }
3577 }
3578
3579 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3580 {
3581         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3582         struct scsi_sense_hdr sshdr;
3583         int ret = 0;
3584
3585         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3586                 return 0;
3587
3588         if (sdkp->WCE && sdkp->media_present) {
3589                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3590                 ret = sd_sync_cache(sdkp, &sshdr);
3591
3592                 if (ret) {
3593                         /* ignore OFFLINE device */
3594                         if (ret == -ENODEV)
3595                                 return 0;
3596
3597                         if (!scsi_sense_valid(&sshdr) ||
3598                             sshdr.sense_key != ILLEGAL_REQUEST)
3599                                 return ret;
3600
3601                         /*
3602                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3603                          * doesn't support sync. There's not much to do and
3604                          * suspend shouldn't fail.
3605                          */
3606                         ret = 0;
3607                 }
3608         }
3609
3610         if (sdkp->device->manage_start_stop) {
3611                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3612                 /* an error is not worth aborting a system sleep */
3613                 ret = sd_start_stop_device(sdkp, 0);
3614                 if (ignore_stop_errors)
3615                         ret = 0;
3616         }
3617
3618         return ret;
3619 }
3620
3621 static int sd_suspend_system(struct device *dev)
3622 {
3623         return sd_suspend_common(dev, true);
3624 }
3625
3626 static int sd_suspend_runtime(struct device *dev)
3627 {
3628         return sd_suspend_common(dev, false);
3629 }
3630
3631 static int sd_resume(struct device *dev)
3632 {
3633         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3634         int ret;
3635
3636         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3637                 return 0;
3638
3639         if (!sdkp->device->manage_start_stop)
3640                 return 0;
3641
3642         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3643         ret = sd_start_stop_device(sdkp, 1);
3644         if (!ret)
3645                 opal_unlock_from_suspend(sdkp->opal_dev);
3646         return ret;
3647 }
3648
3649 /**
3650  *      init_sd - entry point for this driver (both when built in or when
3651  *      a module).
3652  *
3653  *      Note: this function registers this driver with the scsi mid-level.
3654  **/
3655 static int __init init_sd(void)
3656 {
3657         int majors = 0, i, err;
3658
3659         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3660
3661         for (i = 0; i < SD_MAJORS; i++) {
3662                 if (register_blkdev(sd_major(i), "sd") != 0)
3663                         continue;
3664                 majors++;
3665                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3666                                     sd_default_probe, NULL, NULL);
3667         }
3668
3669         if (!majors)
3670                 return -ENODEV;
3671
3672         err = class_register(&sd_disk_class);
3673         if (err)
3674                 goto err_out;
3675
3676         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3677                                          0, 0, NULL);
3678         if (!sd_cdb_cache) {
3679                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3680                 err = -ENOMEM;
3681                 goto err_out_class;
3682         }
3683
3684         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3685         if (!sd_cdb_pool) {
3686                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3687                 err = -ENOMEM;
3688                 goto err_out_cache;
3689         }
3690
3691         sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
3692         if (!sd_page_pool) {
3693                 printk(KERN_ERR "sd: can't init discard page pool\n");
3694                 err = -ENOMEM;
3695                 goto err_out_ppool;
3696         }
3697
3698         err = scsi_register_driver(&sd_template.gendrv);
3699         if (err)
3700                 goto err_out_driver;
3701
3702         return 0;
3703
3704 err_out_driver:
3705         mempool_destroy(sd_page_pool);
3706
3707 err_out_ppool:
3708         mempool_destroy(sd_cdb_pool);
3709
3710 err_out_cache:
3711         kmem_cache_destroy(sd_cdb_cache);
3712
3713 err_out_class:
3714         class_unregister(&sd_disk_class);
3715 err_out:
3716         for (i = 0; i < SD_MAJORS; i++)
3717                 unregister_blkdev(sd_major(i), "sd");
3718         return err;
3719 }
3720
3721 /**
3722  *      exit_sd - exit point for this driver (when it is a module).
3723  *
3724  *      Note: this function unregisters this driver from the scsi mid-level.
3725  **/
3726 static void __exit exit_sd(void)
3727 {
3728         int i;
3729
3730         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3731
3732         scsi_unregister_driver(&sd_template.gendrv);
3733         mempool_destroy(sd_cdb_pool);
3734         mempool_destroy(sd_page_pool);
3735         kmem_cache_destroy(sd_cdb_cache);
3736
3737         class_unregister(&sd_disk_class);
3738
3739         for (i = 0; i < SD_MAJORS; i++) {
3740                 blk_unregister_region(sd_major(i), SD_MINORS);
3741                 unregister_blkdev(sd_major(i), "sd");
3742         }
3743 }
3744
3745 module_init(init_sd);
3746 module_exit(exit_sd);
3747
3748 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3749                                struct scsi_sense_hdr *sshdr)
3750 {
3751         scsi_print_sense_hdr(sdkp->device,
3752                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3753 }
3754
3755 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3756                             int result)
3757 {
3758         const char *hb_string = scsi_hostbyte_string(result);
3759         const char *db_string = scsi_driverbyte_string(result);
3760
3761         if (hb_string || db_string)
3762                 sd_printk(KERN_INFO, sdkp,
3763                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3764                           hb_string ? hb_string : "invalid",
3765                           db_string ? db_string : "invalid");
3766         else
3767                 sd_printk(KERN_INFO, sdkp,
3768                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3769                           msg, host_byte(result), driver_byte(result));
3770 }
3771