drivers/scsi/sd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      sd.c Copyright (C) 1992 Drew Eckhardt
   4  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   5  *
   6  *      Linux scsi disk driver
   7  *              Initial versions: Drew Eckhardt
   8  *              Subsequent revisions: Eric Youngdale
   9  *      Modification history:
  10  *       - Drew Eckhardt <[email protected]> original
  11  *       - Eric Youngdale <[email protected]> add scatter-gather, multiple
  12  *         outstanding request, and other enhancements.
  13  *         Support loadable low-level scsi drivers.
  14  *       - Jirka Hanika <[email protected]> support more scsi disks using
  15  *         eight major numbers.
  16  *       - Richard Gooch <[email protected]> support devfs.
  17  *       - Torben Mathiasen <[email protected]> Resource allocation fixes in
  18  *         sd_init and cleanups.
  19  *       - Alex Davis <[email protected]> Fix problem where partition info
  20  *         not being read in sd_open. Fix problem where removable media
  21  *         could be ejected after sd_open.
  22  *       - Douglas Gilbert <[email protected]> cleanup for lk 2.5.x
  23  *       - Badari Pulavarty <[email protected]>, Matthew Wilcox
  24  *         <[email protected]>, Kurt Garloff <[email protected]>:
  25  *         Support 32k/1M disks.
  26  *
  27  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  28  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  29  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  30  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  31  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  32  *      Note: when the logging level is set by the user, it must be greater
  33  *      than the level indicated above to trigger output.
  34  */
  35
  36 #include <linux/module.h>
  37 #include <linux/fs.h>
  38 #include <linux/kernel.h>
  39 #include <linux/mm.h>
  40 #include <linux/bio.h>
  41 #include <linux/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/major.h>
  51 #include <linux/mutex.h>
  52 #include <linux/string_helpers.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 #define SD_MINORS       16
 101
 102 static void sd_config_discard(struct scsi_disk *, unsigned int);
 103 static void sd_config_write_same(struct scsi_disk *);
 104 static int  sd_revalidate_disk(struct gendisk *);
 105 static void sd_unlock_native_capacity(struct gendisk *disk);
 106 static int  sd_probe(struct device *);
 107 static int  sd_remove(struct device *);
 108 static void sd_shutdown(struct device *);
 109 static int sd_suspend_system(struct device *);
 110 static int sd_suspend_runtime(struct device *);
 111 static int sd_resume_system(struct device *);
 112 static int sd_resume_runtime(struct device *);
 113 static void sd_rescan(struct device *);
 114 static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
 115 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 116 static int sd_done(struct scsi_cmnd *);
 117 static void sd_eh_reset(struct scsi_cmnd *);
 118 static int sd_eh_action(struct scsi_cmnd *, int);
 119 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 120 static void scsi_disk_release(struct device *cdev);
 121
 122 static DEFINE_IDA(sd_index_ida);
 123
 124 static struct kmem_cache *sd_cdb_cache;
 125 static mempool_t *sd_page_pool;
 126 static struct lock_class_key sd_bio_compl_lkclass;
 127
 128 static const char *sd_cache_types[] = {
 129         "write through", "none", "write back",
 130         "write back, no read (daft)"
 131 };
 132
 133 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 134 {
 135         bool wc = false, fua = false;
 136
 137         if (sdkp->WCE) {
 138                 wc = true;
 139                 if (sdkp->DPOFUA)
 140                         fua = true;
 141         }
 142
 143         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 144 }
 145
 146 static ssize_t
 147 cache_type_store(struct device *dev, struct device_attribute *attr,
 148                  const char *buf, size_t count)
 149 {
 150         int ct, rcd, wce, sp;
 151         struct scsi_disk *sdkp = to_scsi_disk(dev);
 152         struct scsi_device *sdp = sdkp->device;
 153         char buffer[64];
 154         char *buffer_data;
 155         struct scsi_mode_data data;
 156         struct scsi_sense_hdr sshdr;
 157         static const char temp[] = "temporary ";
 158         int len;
 159
 160         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 161                 /* no cache control on RBC devices; theoretically they
 162                  * can do it, but there's probably so many exceptions
 163                  * it's not worth the risk */
 164                 return -EINVAL;
 165
 166         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 167                 buf += sizeof(temp) - 1;
 168                 sdkp->cache_override = 1;
 169         } else {
 170                 sdkp->cache_override = 0;
 171         }
 172
 173         ct = sysfs_match_string(sd_cache_types, buf);
 174         if (ct < 0)
 175                 return -EINVAL;
 176
 177         rcd = ct & 0x01 ? 1 : 0;
 178         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 179
 180         if (sdkp->cache_override) {
 181                 sdkp->WCE = wce;
 182                 sdkp->RCD = rcd;
 183                 sd_set_flush_flag(sdkp);
 184                 return count;
 185         }
 186
 187         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 188                             sdkp->max_retries, &data, NULL))
 189                 return -EINVAL;
 190         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 191                   data.block_descriptor_length);
 192         buffer_data = buffer + data.header_length +
 193                 data.block_descriptor_length;
 194         buffer_data[2] &= ~0x05;
 195         buffer_data[2] |= wce << 2 | rcd;
 196         sp = buffer_data[0] & 0x80 ? 1 : 0;
 197         buffer_data[0] &= ~0x80;
 198
 199         /*
 200          * Ensure WP, DPOFUA, and RESERVED fields are cleared in
 201          * received mode parameter buffer before doing MODE SELECT.
 202          */
 203         data.device_specific = 0;
 204
 205         if (scsi_mode_select(sdp, 1, sp, buffer_data, len, SD_TIMEOUT,
 206                              sdkp->max_retries, &data, &sshdr)) {
 207                 if (scsi_sense_valid(&sshdr))
 208                         sd_print_sense_hdr(sdkp, &sshdr);
 209                 return -EINVAL;
 210         }
 211         sd_revalidate_disk(sdkp->disk);
 212         return count;
 213 }
 214
 215 static ssize_t
 216 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 217                        char *buf)
 218 {
 219         struct scsi_disk *sdkp = to_scsi_disk(dev);
 220         struct scsi_device *sdp = sdkp->device;
 221
 222         return sprintf(buf, "%u\n", sdp->manage_start_stop);
 223 }
 224
 225 static ssize_t
 226 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 227                         const char *buf, size_t count)
 228 {
 229         struct scsi_disk *sdkp = to_scsi_disk(dev);
 230         struct scsi_device *sdp = sdkp->device;
 231         bool v;
 232
 233         if (!capable(CAP_SYS_ADMIN))
 234                 return -EACCES;
 235
 236         if (kstrtobool(buf, &v))
 237                 return -EINVAL;
 238
 239         sdp->manage_start_stop = v;
 240
 241         return count;
 242 }
 243 static DEVICE_ATTR_RW(manage_start_stop);
 244
 245 static ssize_t
 246 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 247 {
 248         struct scsi_disk *sdkp = to_scsi_disk(dev);
 249
 250         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 251 }
 252
 253 static ssize_t
 254 allow_restart_store(struct device *dev, struct device_attribute *attr,
 255                     const char *buf, size_t count)
 256 {
 257         bool v;
 258         struct scsi_disk *sdkp = to_scsi_disk(dev);
 259         struct scsi_device *sdp = sdkp->device;
 260
 261         if (!capable(CAP_SYS_ADMIN))
 262                 return -EACCES;
 263
 264         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 265                 return -EINVAL;
 266
 267         if (kstrtobool(buf, &v))
 268                 return -EINVAL;
 269
 270         sdp->allow_restart = v;
 271
 272         return count;
 273 }
 274 static DEVICE_ATTR_RW(allow_restart);
 275
 276 static ssize_t
 277 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 278 {
 279         struct scsi_disk *sdkp = to_scsi_disk(dev);
 280         int ct = sdkp->RCD + 2*sdkp->WCE;
 281
 282         return sprintf(buf, "%s\n", sd_cache_types[ct]);
 283 }
 284 static DEVICE_ATTR_RW(cache_type);
 285
 286 static ssize_t
 287 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 288 {
 289         struct scsi_disk *sdkp = to_scsi_disk(dev);
 290
 291         return sprintf(buf, "%u\n", sdkp->DPOFUA);
 292 }
 293 static DEVICE_ATTR_RO(FUA);
 294
 295 static ssize_t
 296 protection_type_show(struct device *dev, struct device_attribute *attr,
 297                      char *buf)
 298 {
 299         struct scsi_disk *sdkp = to_scsi_disk(dev);
 300
 301         return sprintf(buf, "%u\n", sdkp->protection_type);
 302 }
 303
 304 static ssize_t
 305 protection_type_store(struct device *dev, struct device_attribute *attr,
 306                       const char *buf, size_t count)
 307 {
 308         struct scsi_disk *sdkp = to_scsi_disk(dev);
 309         unsigned int val;
 310         int err;
 311
 312         if (!capable(CAP_SYS_ADMIN))
 313                 return -EACCES;
 314
 315         err = kstrtouint(buf, 10, &val);
 316
 317         if (err)
 318                 return err;
 319
 320         if (val <= T10_PI_TYPE3_PROTECTION)
 321                 sdkp->protection_type = val;
 322
 323         return count;
 324 }
 325 static DEVICE_ATTR_RW(protection_type);
 326
 327 static ssize_t
 328 protection_mode_show(struct device *dev, struct device_attribute *attr,
 329                      char *buf)
 330 {
 331         struct scsi_disk *sdkp = to_scsi_disk(dev);
 332         struct scsi_device *sdp = sdkp->device;
 333         unsigned int dif, dix;
 334
 335         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 336         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 337
 338         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 339                 dif = 0;
 340                 dix = 1;
 341         }
 342
 343         if (!dif && !dix)
 344                 return sprintf(buf, "none\n");
 345
 346         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 347 }
 348 static DEVICE_ATTR_RO(protection_mode);
 349
 350 static ssize_t
 351 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 352 {
 353         struct scsi_disk *sdkp = to_scsi_disk(dev);
 354
 355         return sprintf(buf, "%u\n", sdkp->ATO);
 356 }
 357 static DEVICE_ATTR_RO(app_tag_own);
 358
 359 static ssize_t
 360 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 361                        char *buf)
 362 {
 363         struct scsi_disk *sdkp = to_scsi_disk(dev);
 364
 365         return sprintf(buf, "%u\n", sdkp->lbpme);
 366 }
 367 static DEVICE_ATTR_RO(thin_provisioning);
 368
 369 /* sysfs_match_string() requires dense arrays */
 370 static const char *lbp_mode[] = {
 371         [SD_LBP_FULL]           = "full",
 372         [SD_LBP_UNMAP]          = "unmap",
 373         [SD_LBP_WS16]           = "writesame_16",
 374         [SD_LBP_WS10]           = "writesame_10",
 375         [SD_LBP_ZERO]           = "writesame_zero",
 376         [SD_LBP_DISABLE]        = "disabled",
 377 };
 378
 379 static ssize_t
 380 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 381                        char *buf)
 382 {
 383         struct scsi_disk *sdkp = to_scsi_disk(dev);
 384
 385         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 386 }
 387
 388 static ssize_t
 389 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 390                         const char *buf, size_t count)
 391 {
 392         struct scsi_disk *sdkp = to_scsi_disk(dev);
 393         struct scsi_device *sdp = sdkp->device;
 394         int mode;
 395
 396         if (!capable(CAP_SYS_ADMIN))
 397                 return -EACCES;
 398
 399         if (sd_is_zoned(sdkp)) {
 400                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 401                 return count;
 402         }
 403
 404         if (sdp->type != TYPE_DISK)
 405                 return -EINVAL;
 406
 407         mode = sysfs_match_string(lbp_mode, buf);
 408         if (mode < 0)
 409                 return -EINVAL;
 410
 411         sd_config_discard(sdkp, mode);
 412
 413         return count;
 414 }
 415 static DEVICE_ATTR_RW(provisioning_mode);
 416
 417 /* sysfs_match_string() requires dense arrays */
 418 static const char *zeroing_mode[] = {
 419         [SD_ZERO_WRITE]         = "write",
 420         [SD_ZERO_WS]            = "writesame",
 421         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 422         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 423 };
 424
 425 static ssize_t
 426 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 427                   char *buf)
 428 {
 429         struct scsi_disk *sdkp = to_scsi_disk(dev);
 430
 431         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 432 }
 433
 434 static ssize_t
 435 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 436                    const char *buf, size_t count)
 437 {
 438         struct scsi_disk *sdkp = to_scsi_disk(dev);
 439         int mode;
 440
 441         if (!capable(CAP_SYS_ADMIN))
 442                 return -EACCES;
 443
 444         mode = sysfs_match_string(zeroing_mode, buf);
 445         if (mode < 0)
 446                 return -EINVAL;
 447
 448         sdkp->zeroing_mode = mode;
 449
 450         return count;
 451 }
 452 static DEVICE_ATTR_RW(zeroing_mode);
 453
 454 static ssize_t
 455 max_medium_access_timeouts_show(struct device *dev,
 456                                 struct device_attribute *attr, char *buf)
 457 {
 458         struct scsi_disk *sdkp = to_scsi_disk(dev);
 459
 460         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 461 }
 462
 463 static ssize_t
 464 max_medium_access_timeouts_store(struct device *dev,
 465                                  struct device_attribute *attr, const char *buf,
 466                                  size_t count)
 467 {
 468         struct scsi_disk *sdkp = to_scsi_disk(dev);
 469         int err;
 470
 471         if (!capable(CAP_SYS_ADMIN))
 472                 return -EACCES;
 473
 474         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 475
 476         return err ? err : count;
 477 }
 478 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 479
 480 static ssize_t
 481 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 482                            char *buf)
 483 {
 484         struct scsi_disk *sdkp = to_scsi_disk(dev);
 485
 486         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 487 }
 488
 489 static ssize_t
 490 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 491                             const char *buf, size_t count)
 492 {
 493         struct scsi_disk *sdkp = to_scsi_disk(dev);
 494         struct scsi_device *sdp = sdkp->device;
 495         unsigned long max;
 496         int err;
 497
 498         if (!capable(CAP_SYS_ADMIN))
 499                 return -EACCES;
 500
 501         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 502                 return -EINVAL;
 503
 504         err = kstrtoul(buf, 10, &max);
 505
 506         if (err)
 507                 return err;
 508
 509         if (max == 0)
 510                 sdp->no_write_same = 1;
 511         else if (max <= SD_MAX_WS16_BLOCKS) {
 512                 sdp->no_write_same = 0;
 513                 sdkp->max_ws_blocks = max;
 514         }
 515
 516         sd_config_write_same(sdkp);
 517
 518         return count;
 519 }
 520 static DEVICE_ATTR_RW(max_write_same_blocks);
 521
 522 static ssize_t
 523 zoned_cap_show(struct device *dev, struct device_attribute *attr, char *buf)
 524 {
 525         struct scsi_disk *sdkp = to_scsi_disk(dev);
 526
 527         if (sdkp->device->type == TYPE_ZBC)
 528                 return sprintf(buf, "host-managed\n");
 529         if (sdkp->zoned == 1)
 530                 return sprintf(buf, "host-aware\n");
 531         if (sdkp->zoned == 2)
 532                 return sprintf(buf, "drive-managed\n");
 533         return sprintf(buf, "none\n");
 534 }
 535 static DEVICE_ATTR_RO(zoned_cap);
 536
 537 static ssize_t
 538 max_retries_store(struct device *dev, struct device_attribute *attr,
 539                   const char *buf, size_t count)
 540 {
 541         struct scsi_disk *sdkp = to_scsi_disk(dev);
 542         struct scsi_device *sdev = sdkp->device;
 543         int retries, err;
 544
 545         err = kstrtoint(buf, 10, &retries);
 546         if (err)
 547                 return err;
 548
 549         if (retries == SCSI_CMD_RETRIES_NO_LIMIT || retries <= SD_MAX_RETRIES) {
 550                 sdkp->max_retries = retries;
 551                 return count;
 552         }
 553
 554         sdev_printk(KERN_ERR, sdev, "max_retries must be between -1 and %d\n",
 555                     SD_MAX_RETRIES);
 556         return -EINVAL;
 557 }
 558
 559 static ssize_t
 560 max_retries_show(struct device *dev, struct device_attribute *attr,
 561                  char *buf)
 562 {
 563         struct scsi_disk *sdkp = to_scsi_disk(dev);
 564
 565         return sprintf(buf, "%d\n", sdkp->max_retries);
 566 }
 567
 568 static DEVICE_ATTR_RW(max_retries);
 569
 570 static struct attribute *sd_disk_attrs[] = {
 571         &dev_attr_cache_type.attr,
 572         &dev_attr_FUA.attr,
 573         &dev_attr_allow_restart.attr,
 574         &dev_attr_manage_start_stop.attr,
 575         &dev_attr_protection_type.attr,
 576         &dev_attr_protection_mode.attr,
 577         &dev_attr_app_tag_own.attr,
 578         &dev_attr_thin_provisioning.attr,
 579         &dev_attr_provisioning_mode.attr,
 580         &dev_attr_zeroing_mode.attr,
 581         &dev_attr_max_write_same_blocks.attr,
 582         &dev_attr_max_medium_access_timeouts.attr,
 583         &dev_attr_zoned_cap.attr,
 584         &dev_attr_max_retries.attr,
 585         NULL,
 586 };
 587 ATTRIBUTE_GROUPS(sd_disk);
 588
 589 static struct class sd_disk_class = {
 590         .name           = "scsi_disk",
 591         .owner          = THIS_MODULE,
 592         .dev_release    = scsi_disk_release,
 593         .dev_groups     = sd_disk_groups,
 594 };
 595
 596 static const struct dev_pm_ops sd_pm_ops = {
 597         .suspend                = sd_suspend_system,
 598         .resume                 = sd_resume_system,
 599         .poweroff               = sd_suspend_system,
 600         .restore                = sd_resume_system,
 601         .runtime_suspend        = sd_suspend_runtime,
 602         .runtime_resume         = sd_resume_runtime,
 603 };
 604
 605 static struct scsi_driver sd_template = {
 606         .gendrv = {
 607                 .name           = "sd",
 608                 .owner          = THIS_MODULE,
 609                 .probe          = sd_probe,
 610                 .probe_type     = PROBE_PREFER_ASYNCHRONOUS,
 611                 .remove         = sd_remove,
 612                 .shutdown       = sd_shutdown,
 613                 .pm             = &sd_pm_ops,
 614         },
 615         .rescan                 = sd_rescan,
 616         .init_command           = sd_init_command,
 617         .uninit_command         = sd_uninit_command,
 618         .done                   = sd_done,
 619         .eh_action              = sd_eh_action,
 620         .eh_reset               = sd_eh_reset,
 621 };
 622
 623 /*
 624  * Don't request a new module, as that could deadlock in multipath
 625  * environment.
 626  */
 627 static void sd_default_probe(dev_t devt)
 628 {
 629 }
 630
 631 /*
 632  * Device no to disk mapping:
 633  *
 634  *       major         disc2     disc  p1
 635  *   |............|.............|....|....| <- dev_t
 636  *    31        20 19          8 7  4 3  0
 637  *
 638  * Inside a major, we have 16k disks, however mapped non-
 639  * contiguously. The first 16 disks are for major0, the next
 640  * ones with major1, ... Disk 256 is for major0 again, disk 272
 641  * for major1, ...
 642  * As we stay compatible with our numbering scheme, we can reuse
 643  * the well-know SCSI majors 8, 65--71, 136--143.
 644  */
 645 static int sd_major(int major_idx)
 646 {
 647         switch (major_idx) {
 648         case 0:
 649                 return SCSI_DISK0_MAJOR;
 650         case 1 ... 7:
 651                 return SCSI_DISK1_MAJOR + major_idx - 1;
 652         case 8 ... 15:
 653                 return SCSI_DISK8_MAJOR + major_idx - 8;
 654         default:
 655                 BUG();
 656                 return 0;       /* shut up gcc */
 657         }
 658 }
 659
 660 #ifdef CONFIG_BLK_SED_OPAL
 661 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
 662                 size_t len, bool send)
 663 {
 664         struct scsi_disk *sdkp = data;
 665         struct scsi_device *sdev = sdkp->device;
 666         u8 cdb[12] = { 0, };
 667         int ret;
 668
 669         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
 670         cdb[1] = secp;
 671         put_unaligned_be16(spsp, &cdb[2]);
 672         put_unaligned_be32(len, &cdb[6]);
 673
 674         ret = scsi_execute(sdev, cdb, send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
 675                 buffer, len, NULL, NULL, SD_TIMEOUT, sdkp->max_retries, 0,
 676                 RQF_PM, NULL);
 677         return ret <= 0 ? ret : -EIO;
 678 }
 679 #endif /* CONFIG_BLK_SED_OPAL */
 680
 681 /*
 682  * Look up the DIX operation based on whether the command is read or
 683  * write and whether dix and dif are enabled.
 684  */
 685 static unsigned int sd_prot_op(bool write, bool dix, bool dif)
 686 {
 687         /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
 688         static const unsigned int ops[] = {     /* wrt dix dif */
 689                 SCSI_PROT_NORMAL,               /*  0   0   0  */
 690                 SCSI_PROT_READ_STRIP,           /*  0   0   1  */
 691                 SCSI_PROT_READ_INSERT,          /*  0   1   0  */
 692                 SCSI_PROT_READ_PASS,            /*  0   1   1  */
 693                 SCSI_PROT_NORMAL,               /*  1   0   0  */
 694                 SCSI_PROT_WRITE_INSERT,         /*  1   0   1  */
 695                 SCSI_PROT_WRITE_STRIP,          /*  1   1   0  */
 696                 SCSI_PROT_WRITE_PASS,           /*  1   1   1  */
 697         };
 698
 699         return ops[write << 2 | dix << 1 | dif];
 700 }
 701
 702 /*
 703  * Returns a mask of the protection flags that are valid for a given DIX
 704  * operation.
 705  */
 706 static unsigned int sd_prot_flag_mask(unsigned int prot_op)
 707 {
 708         static const unsigned int flag_mask[] = {
 709                 [SCSI_PROT_NORMAL]              = 0,
 710
 711                 [SCSI_PROT_READ_STRIP]          = SCSI_PROT_TRANSFER_PI |
 712                                                   SCSI_PROT_GUARD_CHECK |
 713                                                   SCSI_PROT_REF_CHECK |
 714                                                   SCSI_PROT_REF_INCREMENT,
 715
 716                 [SCSI_PROT_READ_INSERT]         = SCSI_PROT_REF_INCREMENT |
 717                                                   SCSI_PROT_IP_CHECKSUM,
 718
 719                 [SCSI_PROT_READ_PASS]           = SCSI_PROT_TRANSFER_PI |
 720                                                   SCSI_PROT_GUARD_CHECK |
 721                                                   SCSI_PROT_REF_CHECK |
 722                                                   SCSI_PROT_REF_INCREMENT |
 723                                                   SCSI_PROT_IP_CHECKSUM,
 724
 725                 [SCSI_PROT_WRITE_INSERT]        = SCSI_PROT_TRANSFER_PI |
 726                                                   SCSI_PROT_REF_INCREMENT,
 727
 728                 [SCSI_PROT_WRITE_STRIP]         = SCSI_PROT_GUARD_CHECK |
 729                                                   SCSI_PROT_REF_CHECK |
 730                                                   SCSI_PROT_REF_INCREMENT |
 731                                                   SCSI_PROT_IP_CHECKSUM,
 732
 733                 [SCSI_PROT_WRITE_PASS]          = SCSI_PROT_TRANSFER_PI |
 734                                                   SCSI_PROT_GUARD_CHECK |
 735                                                   SCSI_PROT_REF_CHECK |
 736                                                   SCSI_PROT_REF_INCREMENT |
 737                                                   SCSI_PROT_IP_CHECKSUM,
 738         };
 739
 740         return flag_mask[prot_op];
 741 }
 742
 743 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 744                                            unsigned int dix, unsigned int dif)
 745 {
 746         struct request *rq = scsi_cmd_to_rq(scmd);
 747         struct bio *bio = rq->bio;
 748         unsigned int prot_op = sd_prot_op(rq_data_dir(rq), dix, dif);
 749         unsigned int protect = 0;
 750
 751         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 752                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 753                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 754
 755                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 756                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 757         }
 758
 759         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 760                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 761
 762                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 763                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 764         }
 765
 766         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 767                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 768
 769                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 770                         protect = 3 << 5;       /* Disable target PI checking */
 771                 else
 772                         protect = 1 << 5;       /* Enable target PI checking */
 773         }
 774
 775         scsi_set_prot_op(scmd, prot_op);
 776         scsi_set_prot_type(scmd, dif);
 777         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 778
 779         return protect;
 780 }
 781
 782 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 783 {
 784         struct request_queue *q = sdkp->disk->queue;
 785         unsigned int logical_block_size = sdkp->device->sector_size;
 786         unsigned int max_blocks = 0;
 787
 788         q->limits.discard_alignment =
 789                 sdkp->unmap_alignment * logical_block_size;
 790         q->limits.discard_granularity =
 791                 max(sdkp->physical_block_size,
 792                     sdkp->unmap_granularity * logical_block_size);
 793         sdkp->provisioning_mode = mode;
 794
 795         switch (mode) {
 796
 797         case SD_LBP_FULL:
 798         case SD_LBP_DISABLE:
 799                 blk_queue_max_discard_sectors(q, 0);
 800                 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 801                 return;
 802
 803         case SD_LBP_UNMAP:
 804                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 805                                           (u32)SD_MAX_WS16_BLOCKS);
 806                 break;
 807
 808         case SD_LBP_WS16:
 809                 if (sdkp->device->unmap_limit_for_ws)
 810                         max_blocks = sdkp->max_unmap_blocks;
 811                 else
 812                         max_blocks = sdkp->max_ws_blocks;
 813
 814                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
 815                 break;
 816
 817         case SD_LBP_WS10:
 818                 if (sdkp->device->unmap_limit_for_ws)
 819                         max_blocks = sdkp->max_unmap_blocks;
 820                 else
 821                         max_blocks = sdkp->max_ws_blocks;
 822
 823                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
 824                 break;
 825
 826         case SD_LBP_ZERO:
 827                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 828                                           (u32)SD_MAX_WS10_BLOCKS);
 829                 break;
 830         }
 831
 832         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 833         blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 834 }
 835
 836 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 837 {
 838         struct scsi_device *sdp = cmd->device;
 839         struct request *rq = scsi_cmd_to_rq(cmd);
 840         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
 841         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 842         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 843         unsigned int data_len = 24;
 844         char *buf;
 845
 846         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 847         if (!rq->special_vec.bv_page)
 848                 return BLK_STS_RESOURCE;
 849         clear_highpage(rq->special_vec.bv_page);
 850         rq->special_vec.bv_offset = 0;
 851         rq->special_vec.bv_len = data_len;
 852         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 853
 854         cmd->cmd_len = 10;
 855         cmd->cmnd[0] = UNMAP;
 856         cmd->cmnd[8] = 24;
 857
 858         buf = bvec_virt(&rq->special_vec);
 859         put_unaligned_be16(6 + 16, &buf[0]);
 860         put_unaligned_be16(16, &buf[2]);
 861         put_unaligned_be64(lba, &buf[8]);
 862         put_unaligned_be32(nr_blocks, &buf[16]);
 863
 864         cmd->allowed = sdkp->max_retries;
 865         cmd->transfersize = data_len;
 866         rq->timeout = SD_TIMEOUT;
 867
 868         return scsi_alloc_sgtables(cmd);
 869 }
 870
 871 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
 872                 bool unmap)
 873 {
 874         struct scsi_device *sdp = cmd->device;
 875         struct request *rq = scsi_cmd_to_rq(cmd);
 876         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
 877         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 878         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 879         u32 data_len = sdp->sector_size;
 880
 881         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 882         if (!rq->special_vec.bv_page)
 883                 return BLK_STS_RESOURCE;
 884         clear_highpage(rq->special_vec.bv_page);
 885         rq->special_vec.bv_offset = 0;
 886         rq->special_vec.bv_len = data_len;
 887         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 888
 889         cmd->cmd_len = 16;
 890         cmd->cmnd[0] = WRITE_SAME_16;
 891         if (unmap)
 892                 cmd->cmnd[1] = 0x8; /* UNMAP */
 893         put_unaligned_be64(lba, &cmd->cmnd[2]);
 894         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
 895
 896         cmd->allowed = sdkp->max_retries;
 897         cmd->transfersize = data_len;
 898         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 899
 900         return scsi_alloc_sgtables(cmd);
 901 }
 902
 903 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
 904                 bool unmap)
 905 {
 906         struct scsi_device *sdp = cmd->device;
 907         struct request *rq = scsi_cmd_to_rq(cmd);
 908         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
 909         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 910         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 911         u32 data_len = sdp->sector_size;
 912
 913         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 914         if (!rq->special_vec.bv_page)
 915                 return BLK_STS_RESOURCE;
 916         clear_highpage(rq->special_vec.bv_page);
 917         rq->special_vec.bv_offset = 0;
 918         rq->special_vec.bv_len = data_len;
 919         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 920
 921         cmd->cmd_len = 10;
 922         cmd->cmnd[0] = WRITE_SAME;
 923         if (unmap)
 924                 cmd->cmnd[1] = 0x8; /* UNMAP */
 925         put_unaligned_be32(lba, &cmd->cmnd[2]);
 926         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
 927
 928         cmd->allowed = sdkp->max_retries;
 929         cmd->transfersize = data_len;
 930         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 931
 932         return scsi_alloc_sgtables(cmd);
 933 }
 934
 935 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 936 {
 937         struct request *rq = scsi_cmd_to_rq(cmd);
 938         struct scsi_device *sdp = cmd->device;
 939         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
 940         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 941         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 942
 943         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 944                 switch (sdkp->zeroing_mode) {
 945                 case SD_ZERO_WS16_UNMAP:
 946                         return sd_setup_write_same16_cmnd(cmd, true);
 947                 case SD_ZERO_WS10_UNMAP:
 948                         return sd_setup_write_same10_cmnd(cmd, true);
 949                 }
 950         }
 951
 952         if (sdp->no_write_same) {
 953                 rq->rq_flags |= RQF_QUIET;
 954                 return BLK_STS_TARGET;
 955         }
 956
 957         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
 958                 return sd_setup_write_same16_cmnd(cmd, false);
 959
 960         return sd_setup_write_same10_cmnd(cmd, false);
 961 }
 962
 963 static void sd_config_write_same(struct scsi_disk *sdkp)
 964 {
 965         struct request_queue *q = sdkp->disk->queue;
 966         unsigned int logical_block_size = sdkp->device->sector_size;
 967
 968         if (sdkp->device->no_write_same) {
 969                 sdkp->max_ws_blocks = 0;
 970                 goto out;
 971         }
 972
 973         /* Some devices can not handle block counts above 0xffff despite
 974          * supporting WRITE SAME(16). Consequently we default to 64k
 975          * blocks per I/O unless the device explicitly advertises a
 976          * bigger limit.
 977          */
 978         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 979                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 980                                                    (u32)SD_MAX_WS16_BLOCKS);
 981         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 982                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 983                                                    (u32)SD_MAX_WS10_BLOCKS);
 984         else {
 985                 sdkp->device->no_write_same = 1;
 986                 sdkp->max_ws_blocks = 0;
 987         }
 988
 989         if (sdkp->lbprz && sdkp->lbpws)
 990                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 991         else if (sdkp->lbprz && sdkp->lbpws10)
 992                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 993         else if (sdkp->max_ws_blocks)
 994                 sdkp->zeroing_mode = SD_ZERO_WS;
 995         else
 996                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 997
 998         if (sdkp->max_ws_blocks &&
 999             sdkp->physical_block_size > logical_block_size) {
1000                 /*
1001                  * Reporting a maximum number of blocks that is not aligned
1002                  * on the device physical size would cause a large write same
1003                  * request to be split into physically unaligned chunks by
1004                  * __blkdev_issue_write_zeroes() even if the caller of this
1005                  * functions took care to align the large request. So make sure
1006                  * the maximum reported is aligned to the device physical block
1007                  * size. This is only an optional optimization for regular
1008                  * disks, but this is mandatory to avoid failure of large write
1009                  * same requests directed at sequential write required zones of
1010                  * host-managed ZBC disks.
1011                  */
1012                 sdkp->max_ws_blocks =
1013                         round_down(sdkp->max_ws_blocks,
1014                                    bytes_to_logical(sdkp->device,
1015                                                     sdkp->physical_block_size));
1016         }
1017
1018 out:
1019         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
1020                                          (logical_block_size >> 9));
1021 }
1022
1023 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1024 {
1025         struct request *rq = scsi_cmd_to_rq(cmd);
1026         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1027
1028         /* flush requests don't perform I/O, zero the S/G table */
1029         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1030
1031         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1032         cmd->cmd_len = 10;
1033         cmd->transfersize = 0;
1034         cmd->allowed = sdkp->max_retries;
1035
1036         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1037         return BLK_STS_OK;
1038 }
1039
1040 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1041                                        sector_t lba, unsigned int nr_blocks,
1042                                        unsigned char flags)
1043 {
1044         cmd->cmd_len = SD_EXT_CDB_SIZE;
1045         cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
1046         cmd->cmnd[7]  = 0x18; /* Additional CDB len */
1047         cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
1048         cmd->cmnd[10] = flags;
1049         put_unaligned_be64(lba, &cmd->cmnd[12]);
1050         put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
1051         put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
1052
1053         return BLK_STS_OK;
1054 }
1055
1056 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1057                                        sector_t lba, unsigned int nr_blocks,
1058                                        unsigned char flags)
1059 {
1060         cmd->cmd_len  = 16;
1061         cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
1062         cmd->cmnd[1]  = flags;
1063         cmd->cmnd[14] = 0;
1064         cmd->cmnd[15] = 0;
1065         put_unaligned_be64(lba, &cmd->cmnd[2]);
1066         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1067
1068         return BLK_STS_OK;
1069 }
1070
1071 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1072                                        sector_t lba, unsigned int nr_blocks,
1073                                        unsigned char flags)
1074 {
1075         cmd->cmd_len = 10;
1076         cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1077         cmd->cmnd[1] = flags;
1078         cmd->cmnd[6] = 0;
1079         cmd->cmnd[9] = 0;
1080         put_unaligned_be32(lba, &cmd->cmnd[2]);
1081         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1082
1083         return BLK_STS_OK;
1084 }
1085
1086 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1087                                       sector_t lba, unsigned int nr_blocks,
1088                                       unsigned char flags)
1089 {
1090         /* Avoid that 0 blocks gets translated into 256 blocks. */
1091         if (WARN_ON_ONCE(nr_blocks == 0))
1092                 return BLK_STS_IOERR;
1093
1094         if (unlikely(flags & 0x8)) {
1095                 /*
1096                  * This happens only if this drive failed 10byte rw
1097                  * command with ILLEGAL_REQUEST during operation and
1098                  * thus turned off use_10_for_rw.
1099                  */
1100                 scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1101                 return BLK_STS_IOERR;
1102         }
1103
1104         cmd->cmd_len = 6;
1105         cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1106         cmd->cmnd[1] = (lba >> 16) & 0x1f;
1107         cmd->cmnd[2] = (lba >> 8) & 0xff;
1108         cmd->cmnd[3] = lba & 0xff;
1109         cmd->cmnd[4] = nr_blocks;
1110         cmd->cmnd[5] = 0;
1111
1112         return BLK_STS_OK;
1113 }
1114
1115 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1116 {
1117         struct request *rq = scsi_cmd_to_rq(cmd);
1118         struct scsi_device *sdp = cmd->device;
1119         struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
1120         sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1121         sector_t threshold;
1122         unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1123         unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1124         bool write = rq_data_dir(rq) == WRITE;
1125         unsigned char protect, fua;
1126         blk_status_t ret;
1127         unsigned int dif;
1128         bool dix;
1129
1130         ret = scsi_alloc_sgtables(cmd);
1131         if (ret != BLK_STS_OK)
1132                 return ret;
1133
1134         ret = BLK_STS_IOERR;
1135         if (!scsi_device_online(sdp) || sdp->changed) {
1136                 scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1137                 goto fail;
1138         }
1139
1140         if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->q->disk)) {
1141                 scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1142                 goto fail;
1143         }
1144
1145         if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1146                 scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1147                 goto fail;
1148         }
1149
1150         /*
1151          * Some SD card readers can't handle accesses which touch the
1152          * last one or two logical blocks. Split accesses as needed.
1153          */
1154         threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1155
1156         if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1157                 if (lba < threshold) {
1158                         /* Access up to the threshold but not beyond */
1159                         nr_blocks = threshold - lba;
1160                 } else {
1161                         /* Access only a single logical block */
1162                         nr_blocks = 1;
1163                 }
1164         }
1165
1166         if (req_op(rq) == REQ_OP_ZONE_APPEND) {
1167                 ret = sd_zbc_prepare_zone_append(cmd, &lba, nr_blocks);
1168                 if (ret)
1169                         goto fail;
1170         }
1171
1172         fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1173         dix = scsi_prot_sg_count(cmd);
1174         dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
1175
1176         if (dif || dix)
1177                 protect = sd_setup_protect_cmnd(cmd, dix, dif);
1178         else
1179                 protect = 0;
1180
1181         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1182                 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1183                                          protect | fua);
1184         } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1185                 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1186                                          protect | fua);
1187         } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1188                    sdp->use_10_for_rw || protect) {
1189                 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1190                                          protect | fua);
1191         } else {
1192                 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1193                                         protect | fua);
1194         }
1195
1196         if (unlikely(ret != BLK_STS_OK))
1197                 goto fail;
1198
1199         /*
1200          * We shouldn't disconnect in the middle of a sector, so with a dumb
1201          * host adapter, it's safe to assume that we can at least transfer
1202          * this many bytes between each connect / disconnect.
1203          */
1204         cmd->transfersize = sdp->sector_size;
1205         cmd->underflow = nr_blocks << 9;
1206         cmd->allowed = sdkp->max_retries;
1207         cmd->sdb.length = nr_blocks * sdp->sector_size;
1208
1209         SCSI_LOG_HLQUEUE(1,
1210                          scmd_printk(KERN_INFO, cmd,
1211                                      "%s: block=%llu, count=%d\n", __func__,
1212                                      (unsigned long long)blk_rq_pos(rq),
1213                                      blk_rq_sectors(rq)));
1214         SCSI_LOG_HLQUEUE(2,
1215                          scmd_printk(KERN_INFO, cmd,
1216                                      "%s %d/%u 512 byte blocks.\n",
1217                                      write ? "writing" : "reading", nr_blocks,
1218                                      blk_rq_sectors(rq)));
1219
1220         /*
1221          * This indicates that the command is ready from our end to be queued.
1222          */
1223         return BLK_STS_OK;
1224 fail:
1225         scsi_free_sgtables(cmd);
1226         return ret;
1227 }
1228
1229 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1230 {
1231         struct request *rq = scsi_cmd_to_rq(cmd);
1232
1233         switch (req_op(rq)) {
1234         case REQ_OP_DISCARD:
1235                 switch (scsi_disk(rq->q->disk)->provisioning_mode) {
1236                 case SD_LBP_UNMAP:
1237                         return sd_setup_unmap_cmnd(cmd);
1238                 case SD_LBP_WS16:
1239                         return sd_setup_write_same16_cmnd(cmd, true);
1240                 case SD_LBP_WS10:
1241                         return sd_setup_write_same10_cmnd(cmd, true);
1242                 case SD_LBP_ZERO:
1243                         return sd_setup_write_same10_cmnd(cmd, false);
1244                 default:
1245                         return BLK_STS_TARGET;
1246                 }
1247         case REQ_OP_WRITE_ZEROES:
1248                 return sd_setup_write_zeroes_cmnd(cmd);
1249         case REQ_OP_FLUSH:
1250                 return sd_setup_flush_cmnd(cmd);
1251         case REQ_OP_READ:
1252         case REQ_OP_WRITE:
1253         case REQ_OP_ZONE_APPEND:
1254                 return sd_setup_read_write_cmnd(cmd);
1255         case REQ_OP_ZONE_RESET:
1256                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1257                                                    false);
1258         case REQ_OP_ZONE_RESET_ALL:
1259                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1260                                                    true);
1261         case REQ_OP_ZONE_OPEN:
1262                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false);
1263         case REQ_OP_ZONE_CLOSE:
1264                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false);
1265         case REQ_OP_ZONE_FINISH:
1266                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false);
1267         default:
1268                 WARN_ON_ONCE(1);
1269                 return BLK_STS_NOTSUPP;
1270         }
1271 }
1272
1273 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1274 {
1275         struct request *rq = scsi_cmd_to_rq(SCpnt);
1276
1277         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1278                 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1279 }
1280
1281 static bool sd_need_revalidate(struct block_device *bdev,
1282                 struct scsi_disk *sdkp)
1283 {
1284         if (sdkp->device->removable || sdkp->write_prot) {
1285                 if (bdev_check_media_change(bdev))
1286                         return true;
1287         }
1288
1289         /*
1290          * Force a full rescan after ioctl(BLKRRPART).  While the disk state has
1291          * nothing to do with partitions, BLKRRPART is used to force a full
1292          * revalidate after things like a format for historical reasons.
1293          */
1294         return test_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
1295 }
1296
1297 /**
1298  *      sd_open - open a scsi disk device
1299  *      @bdev: Block device of the scsi disk to open
1300  *      @mode: FMODE_* mask
1301  *
1302  *      Returns 0 if successful. Returns a negated errno value in case
1303  *      of error.
1304  *
1305  *      Note: This can be called from a user context (e.g. fsck(1) )
1306  *      or from within the kernel (e.g. as a result of a mount(1) ).
1307  *      In the latter case @inode and @filp carry an abridged amount
1308  *      of information as noted above.
1309  *
1310  *      Locking: called with bdev->bd_disk->open_mutex held.
1311  **/
1312 static int sd_open(struct block_device *bdev, fmode_t mode)
1313 {
1314         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1315         struct scsi_device *sdev = sdkp->device;
1316         int retval;
1317
1318         if (scsi_device_get(sdev))
1319                 return -ENXIO;
1320
1321         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1322
1323         /*
1324          * If the device is in error recovery, wait until it is done.
1325          * If the device is offline, then disallow any access to it.
1326          */
1327         retval = -ENXIO;
1328         if (!scsi_block_when_processing_errors(sdev))
1329                 goto error_out;
1330
1331         if (sd_need_revalidate(bdev, sdkp))
1332                 sd_revalidate_disk(bdev->bd_disk);
1333
1334         /*
1335          * If the drive is empty, just let the open fail.
1336          */
1337         retval = -ENOMEDIUM;
1338         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1339                 goto error_out;
1340
1341         /*
1342          * If the device has the write protect tab set, have the open fail
1343          * if the user expects to be able to write to the thing.
1344          */
1345         retval = -EROFS;
1346         if (sdkp->write_prot && (mode & FMODE_WRITE))
1347                 goto error_out;
1348
1349         /*
1350          * It is possible that the disk changing stuff resulted in
1351          * the device being taken offline.  If this is the case,
1352          * report this to the user, and don't pretend that the
1353          * open actually succeeded.
1354          */
1355         retval = -ENXIO;
1356         if (!scsi_device_online(sdev))
1357                 goto error_out;
1358
1359         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1360                 if (scsi_block_when_processing_errors(sdev))
1361                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1362         }
1363
1364         return 0;
1365
1366 error_out:
1367         scsi_device_put(sdev);
1368         return retval;
1369 }
1370
1371 /**
1372  *      sd_release - invoked when the (last) close(2) is called on this
1373  *      scsi disk.
1374  *      @disk: disk to release
1375  *      @mode: FMODE_* mask
1376  *
1377  *      Returns 0.
1378  *
1379  *      Note: may block (uninterruptible) if error recovery is underway
1380  *      on this disk.
1381  *
1382  *      Locking: called with bdev->bd_disk->open_mutex held.
1383  **/
1384 static void sd_release(struct gendisk *disk, fmode_t mode)
1385 {
1386         struct scsi_disk *sdkp = scsi_disk(disk);
1387         struct scsi_device *sdev = sdkp->device;
1388
1389         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1390
1391         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1392                 if (scsi_block_when_processing_errors(sdev))
1393                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1394         }
1395
1396         scsi_device_put(sdev);
1397 }
1398
1399 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1400 {
1401         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1402         struct scsi_device *sdp = sdkp->device;
1403         struct Scsi_Host *host = sdp->host;
1404         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1405         int diskinfo[4];
1406
1407         /* default to most commonly used values */
1408         diskinfo[0] = 0x40;     /* 1 << 6 */
1409         diskinfo[1] = 0x20;     /* 1 << 5 */
1410         diskinfo[2] = capacity >> 11;
1411
1412         /* override with calculated, extended default, or driver values */
1413         if (host->hostt->bios_param)
1414                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1415         else
1416                 scsicam_bios_param(bdev, capacity, diskinfo);
1417
1418         geo->heads = diskinfo[0];
1419         geo->sectors = diskinfo[1];
1420         geo->cylinders = diskinfo[2];
1421         return 0;
1422 }
1423
1424 /**
1425  *      sd_ioctl - process an ioctl
1426  *      @bdev: target block device
1427  *      @mode: FMODE_* mask
1428  *      @cmd: ioctl command number
1429  *      @arg: this is third argument given to ioctl(2) system call.
1430  *      Often contains a pointer.
1431  *
1432  *      Returns 0 if successful (some ioctls return positive numbers on
1433  *      success as well). Returns a negated errno value in case of error.
1434  *
1435  *      Note: most ioctls are forward onto the block subsystem or further
1436  *      down in the scsi subsystem.
1437  **/
1438 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1439                     unsigned int cmd, unsigned long arg)
1440 {
1441         struct gendisk *disk = bdev->bd_disk;
1442         struct scsi_disk *sdkp = scsi_disk(disk);
1443         struct scsi_device *sdp = sdkp->device;
1444         void __user *p = (void __user *)arg;
1445         int error;
1446
1447         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1448                                     "cmd=0x%x\n", disk->disk_name, cmd));
1449
1450         if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
1451                 return -ENOIOCTLCMD;
1452
1453         /*
1454          * If we are in the middle of error recovery, don't let anyone
1455          * else try and use this device.  Also, if error recovery fails, it
1456          * may try and take the device offline, in which case all further
1457          * access to the device is prohibited.
1458          */
1459         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1460                         (mode & FMODE_NDELAY) != 0);
1461         if (error)
1462                 return error;
1463
1464         if (is_sed_ioctl(cmd))
1465                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1466         return scsi_ioctl(sdp, mode, cmd, p);
1467 }
1468
1469 static void set_media_not_present(struct scsi_disk *sdkp)
1470 {
1471         if (sdkp->media_present)
1472                 sdkp->device->changed = 1;
1473
1474         if (sdkp->device->removable) {
1475                 sdkp->media_present = 0;
1476                 sdkp->capacity = 0;
1477         }
1478 }
1479
1480 static int media_not_present(struct scsi_disk *sdkp,
1481                              struct scsi_sense_hdr *sshdr)
1482 {
1483         if (!scsi_sense_valid(sshdr))
1484                 return 0;
1485
1486         /* not invoked for commands that could return deferred errors */
1487         switch (sshdr->sense_key) {
1488         case UNIT_ATTENTION:
1489         case NOT_READY:
1490                 /* medium not present */
1491                 if (sshdr->asc == 0x3A) {
1492                         set_media_not_present(sdkp);
1493                         return 1;
1494                 }
1495         }
1496         return 0;
1497 }
1498
1499 /**
1500  *      sd_check_events - check media events
1501  *      @disk: kernel device descriptor
1502  *      @clearing: disk events currently being cleared
1503  *
1504  *      Returns mask of DISK_EVENT_*.
1505  *
1506  *      Note: this function is invoked from the block subsystem.
1507  **/
1508 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1509 {
1510         struct scsi_disk *sdkp = disk->private_data;
1511         struct scsi_device *sdp;
1512         int retval;
1513         bool disk_changed;
1514
1515         if (!sdkp)
1516                 return 0;
1517
1518         sdp = sdkp->device;
1519         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1520
1521         /*
1522          * If the device is offline, don't send any commands - just pretend as
1523          * if the command failed.  If the device ever comes back online, we
1524          * can deal with it then.  It is only because of unrecoverable errors
1525          * that we would ever take a device offline in the first place.
1526          */
1527         if (!scsi_device_online(sdp)) {
1528                 set_media_not_present(sdkp);
1529                 goto out;
1530         }
1531
1532         /*
1533          * Using TEST_UNIT_READY enables differentiation between drive with
1534          * no cartridge loaded - NOT READY, drive with changed cartridge -
1535          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1536          *
1537          * Drives that auto spin down. eg iomega jaz 1G, will be started
1538          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1539          * sd_revalidate() is called.
1540          */
1541         if (scsi_block_when_processing_errors(sdp)) {
1542                 struct scsi_sense_hdr sshdr = { 0, };
1543
1544                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, sdkp->max_retries,
1545                                               &sshdr);
1546
1547                 /* failed to execute TUR, assume media not present */
1548                 if (retval < 0 || host_byte(retval)) {
1549                         set_media_not_present(sdkp);
1550                         goto out;
1551                 }
1552
1553                 if (media_not_present(sdkp, &sshdr))
1554                         goto out;
1555         }
1556
1557         /*
1558          * For removable scsi disk we have to recognise the presence
1559          * of a disk in the drive.
1560          */
1561         if (!sdkp->media_present)
1562                 sdp->changed = 1;
1563         sdkp->media_present = 1;
1564 out:
1565         /*
1566          * sdp->changed is set under the following conditions:
1567          *
1568          *      Medium present state has changed in either direction.
1569          *      Device has indicated UNIT_ATTENTION.
1570          */
1571         disk_changed = sdp->changed;
1572         sdp->changed = 0;
1573         return disk_changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1574 }
1575
1576 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1577 {
1578         int retries, res;
1579         struct scsi_device *sdp = sdkp->device;
1580         const int timeout = sdp->request_queue->rq_timeout
1581                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1582         struct scsi_sense_hdr my_sshdr;
1583
1584         if (!scsi_device_online(sdp))
1585                 return -ENODEV;
1586
1587         /* caller might not be interested in sense, but we need it */
1588         if (!sshdr)
1589                 sshdr = &my_sshdr;
1590
1591         for (retries = 3; retries > 0; --retries) {
1592                 unsigned char cmd[10] = { 0 };
1593
1594                 cmd[0] = SYNCHRONIZE_CACHE;
1595                 /*
1596                  * Leave the rest of the command zero to indicate
1597                  * flush everything.
1598                  */
1599                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1600                                 timeout, sdkp->max_retries, 0, RQF_PM, NULL);
1601                 if (res == 0)
1602                         break;
1603         }
1604
1605         if (res) {
1606                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1607
1608                 if (res < 0)
1609                         return res;
1610
1611                 if (scsi_status_is_check_condition(res) &&
1612                     scsi_sense_valid(sshdr)) {
1613                         sd_print_sense_hdr(sdkp, sshdr);
1614
1615                         /* we need to evaluate the error return  */
1616                         if (sshdr->asc == 0x3a ||       /* medium not present */
1617                             sshdr->asc == 0x20 ||       /* invalid command */
1618                             (sshdr->asc == 0x74 && sshdr->ascq == 0x71))        /* drive is password locked */
1619                                 /* this is no error here */
1620                                 return 0;
1621                 }
1622
1623                 switch (host_byte(res)) {
1624                 /* ignore errors due to racing a disconnection */
1625                 case DID_BAD_TARGET:
1626                 case DID_NO_CONNECT:
1627                         return 0;
1628                 /* signal the upper layer it might try again */
1629                 case DID_BUS_BUSY:
1630                 case DID_IMM_RETRY:
1631                 case DID_REQUEUE:
1632                 case DID_SOFT_ERROR:
1633                         return -EBUSY;
1634                 default:
1635                         return -EIO;
1636                 }
1637         }
1638         return 0;
1639 }
1640
1641 static void sd_rescan(struct device *dev)
1642 {
1643         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1644
1645         sd_revalidate_disk(sdkp->disk);
1646 }
1647
1648 static int sd_get_unique_id(struct gendisk *disk, u8 id[16],
1649                 enum blk_unique_id type)
1650 {
1651         struct scsi_device *sdev = scsi_disk(disk)->device;
1652         const struct scsi_vpd *vpd;
1653         const unsigned char *d;
1654         int ret = -ENXIO, len;
1655
1656         rcu_read_lock();
1657         vpd = rcu_dereference(sdev->vpd_pg83);
1658         if (!vpd)
1659                 goto out_unlock;
1660
1661         ret = -EINVAL;
1662         for (d = vpd->data + 4; d < vpd->data + vpd->len; d += d[3] + 4) {
1663                 /* we only care about designators with LU association */
1664                 if (((d[1] >> 4) & 0x3) != 0x00)
1665                         continue;
1666                 if ((d[1] & 0xf) != type)
1667                         continue;
1668
1669                 /*
1670                  * Only exit early if a 16-byte descriptor was found.  Otherwise
1671                  * keep looking as one with more entropy might still show up.
1672                  */
1673                 len = d[3];
1674                 if (len != 8 && len != 12 && len != 16)
1675                         continue;
1676                 ret = len;
1677                 memcpy(id, d + 4, len);
1678                 if (len == 16)
1679                         break;
1680         }
1681 out_unlock:
1682         rcu_read_unlock();
1683         return ret;
1684 }
1685
1686 static char sd_pr_type(enum pr_type type)
1687 {
1688         switch (type) {
1689         case PR_WRITE_EXCLUSIVE:
1690                 return 0x01;
1691         case PR_EXCLUSIVE_ACCESS:
1692                 return 0x03;
1693         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1694                 return 0x05;
1695         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1696                 return 0x06;
1697         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1698                 return 0x07;
1699         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1700                 return 0x08;
1701         default:
1702                 return 0;
1703         }
1704 };
1705
1706 static int sd_pr_command(struct block_device *bdev, u8 sa,
1707                 u64 key, u64 sa_key, u8 type, u8 flags)
1708 {
1709         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1710         struct scsi_device *sdev = sdkp->device;
1711         struct scsi_sense_hdr sshdr;
1712         int result;
1713         u8 cmd[16] = { 0, };
1714         u8 data[24] = { 0, };
1715
1716         cmd[0] = PERSISTENT_RESERVE_OUT;
1717         cmd[1] = sa;
1718         cmd[2] = type;
1719         put_unaligned_be32(sizeof(data), &cmd[5]);
1720
1721         put_unaligned_be64(key, &data[0]);
1722         put_unaligned_be64(sa_key, &data[8]);
1723         data[20] = flags;
1724
1725         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1726                         &sshdr, SD_TIMEOUT, sdkp->max_retries, NULL);
1727
1728         if (scsi_status_is_check_condition(result) &&
1729             scsi_sense_valid(&sshdr)) {
1730                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1731                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1732         }
1733
1734         return result;
1735 }
1736
1737 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1738                 u32 flags)
1739 {
1740         if (flags & ~PR_FL_IGNORE_KEY)
1741                 return -EOPNOTSUPP;
1742         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1743                         old_key, new_key, 0,
1744                         (1 << 0) /* APTPL */);
1745 }
1746
1747 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1748                 u32 flags)
1749 {
1750         if (flags)
1751                 return -EOPNOTSUPP;
1752         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1753 }
1754
1755 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1756 {
1757         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1758 }
1759
1760 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1761                 enum pr_type type, bool abort)
1762 {
1763         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1764                              sd_pr_type(type), 0);
1765 }
1766
1767 static int sd_pr_clear(struct block_device *bdev, u64 key)
1768 {
1769         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1770 }
1771
1772 static const struct pr_ops sd_pr_ops = {
1773         .pr_register    = sd_pr_register,
1774         .pr_reserve     = sd_pr_reserve,
1775         .pr_release     = sd_pr_release,
1776         .pr_preempt     = sd_pr_preempt,
1777         .pr_clear       = sd_pr_clear,
1778 };
1779
1780 static void scsi_disk_free_disk(struct gendisk *disk)
1781 {
1782         struct scsi_disk *sdkp = scsi_disk(disk);
1783
1784         put_device(&sdkp->disk_dev);
1785 }
1786
1787 static const struct block_device_operations sd_fops = {
1788         .owner                  = THIS_MODULE,
1789         .open                   = sd_open,
1790         .release                = sd_release,
1791         .ioctl                  = sd_ioctl,
1792         .getgeo                 = sd_getgeo,
1793         .compat_ioctl           = blkdev_compat_ptr_ioctl,
1794         .check_events           = sd_check_events,
1795         .unlock_native_capacity = sd_unlock_native_capacity,
1796         .report_zones           = sd_zbc_report_zones,
1797         .get_unique_id          = sd_get_unique_id,
1798         .free_disk              = scsi_disk_free_disk,
1799         .pr_ops                 = &sd_pr_ops,
1800 };
1801
1802 /**
1803  *      sd_eh_reset - reset error handling callback
1804  *      @scmd:          sd-issued command that has failed
1805  *
1806  *      This function is called by the SCSI midlayer before starting
1807  *      SCSI EH. When counting medium access failures we have to be
1808  *      careful to register it only only once per device and SCSI EH run;
1809  *      there might be several timed out commands which will cause the
1810  *      'max_medium_access_timeouts' counter to trigger after the first
1811  *      SCSI EH run already and set the device to offline.
1812  *      So this function resets the internal counter before starting SCSI EH.
1813  **/
1814 static void sd_eh_reset(struct scsi_cmnd *scmd)
1815 {
1816         struct scsi_disk *sdkp = scsi_disk(scsi_cmd_to_rq(scmd)->q->disk);
1817
1818         /* New SCSI EH run, reset gate variable */
1819         sdkp->ignore_medium_access_errors = false;
1820 }
1821
1822 /**
1823  *      sd_eh_action - error handling callback
1824  *      @scmd:          sd-issued command that has failed
1825  *      @eh_disp:       The recovery disposition suggested by the midlayer
1826  *
1827  *      This function is called by the SCSI midlayer upon completion of an
1828  *      error test command (currently TEST UNIT READY). The result of sending
1829  *      the eh command is passed in eh_disp.  We're looking for devices that
1830  *      fail medium access commands but are OK with non access commands like
1831  *      test unit ready (so wrongly see the device as having a successful
1832  *      recovery)
1833  **/
1834 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1835 {
1836         struct scsi_disk *sdkp = scsi_disk(scsi_cmd_to_rq(scmd)->q->disk);
1837         struct scsi_device *sdev = scmd->device;
1838
1839         if (!scsi_device_online(sdev) ||
1840             !scsi_medium_access_command(scmd) ||
1841             host_byte(scmd->result) != DID_TIME_OUT ||
1842             eh_disp != SUCCESS)
1843                 return eh_disp;
1844
1845         /*
1846          * The device has timed out executing a medium access command.
1847          * However, the TEST UNIT READY command sent during error
1848          * handling completed successfully. Either the device is in the
1849          * process of recovering or has it suffered an internal failure
1850          * that prevents access to the storage medium.
1851          */
1852         if (!sdkp->ignore_medium_access_errors) {
1853                 sdkp->medium_access_timed_out++;
1854                 sdkp->ignore_medium_access_errors = true;
1855         }
1856
1857         /*
1858          * If the device keeps failing read/write commands but TEST UNIT
1859          * READY always completes successfully we assume that medium
1860          * access is no longer possible and take the device offline.
1861          */
1862         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1863                 scmd_printk(KERN_ERR, scmd,
1864                             "Medium access timeout failure. Offlining disk!\n");
1865                 mutex_lock(&sdev->state_mutex);
1866                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1867                 mutex_unlock(&sdev->state_mutex);
1868
1869                 return SUCCESS;
1870         }
1871
1872         return eh_disp;
1873 }
1874
1875 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1876 {
1877         struct request *req = scsi_cmd_to_rq(scmd);
1878         struct scsi_device *sdev = scmd->device;
1879         unsigned int transferred, good_bytes;
1880         u64 start_lba, end_lba, bad_lba;
1881
1882         /*
1883          * Some commands have a payload smaller than the device logical
1884          * block size (e.g. INQUIRY on a 4K disk).
1885          */
1886         if (scsi_bufflen(scmd) <= sdev->sector_size)
1887                 return 0;
1888
1889         /* Check if we have a 'bad_lba' information */
1890         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1891                                      SCSI_SENSE_BUFFERSIZE,
1892                                      &bad_lba))
1893                 return 0;
1894
1895         /*
1896          * If the bad lba was reported incorrectly, we have no idea where
1897          * the error is.
1898          */
1899         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1900         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1901         if (bad_lba < start_lba || bad_lba >= end_lba)
1902                 return 0;
1903
1904         /*
1905          * resid is optional but mostly filled in.  When it's unused,
1906          * its value is zero, so we assume the whole buffer transferred
1907          */
1908         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1909
1910         /* This computation should always be done in terms of the
1911          * resolution of the device's medium.
1912          */
1913         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1914
1915         return min(good_bytes, transferred);
1916 }
1917
1918 /**
1919  *      sd_done - bottom half handler: called when the lower level
1920  *      driver has completed (successfully or otherwise) a scsi command.
1921  *      @SCpnt: mid-level's per command structure.
1922  *
1923  *      Note: potentially run from within an ISR. Must not block.
1924  **/
1925 static int sd_done(struct scsi_cmnd *SCpnt)
1926 {
1927         int result = SCpnt->result;
1928         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1929         unsigned int sector_size = SCpnt->device->sector_size;
1930         unsigned int resid;
1931         struct scsi_sense_hdr sshdr;
1932         struct request *req = scsi_cmd_to_rq(SCpnt);
1933         struct scsi_disk *sdkp = scsi_disk(req->q->disk);
1934         int sense_valid = 0;
1935         int sense_deferred = 0;
1936
1937         switch (req_op(req)) {
1938         case REQ_OP_DISCARD:
1939         case REQ_OP_WRITE_ZEROES:
1940         case REQ_OP_ZONE_RESET:
1941         case REQ_OP_ZONE_RESET_ALL:
1942         case REQ_OP_ZONE_OPEN:
1943         case REQ_OP_ZONE_CLOSE:
1944         case REQ_OP_ZONE_FINISH:
1945                 if (!result) {
1946                         good_bytes = blk_rq_bytes(req);
1947                         scsi_set_resid(SCpnt, 0);
1948                 } else {
1949                         good_bytes = 0;
1950                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1951                 }
1952                 break;
1953         default:
1954                 /*
1955                  * In case of bogus fw or device, we could end up having
1956                  * an unaligned partial completion. Check this here and force
1957                  * alignment.
1958                  */
1959                 resid = scsi_get_resid(SCpnt);
1960                 if (resid & (sector_size - 1)) {
1961                         sd_printk(KERN_INFO, sdkp,
1962                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1963                                 resid, sector_size);
1964                         scsi_print_command(SCpnt);
1965                         resid = min(scsi_bufflen(SCpnt),
1966                                     round_up(resid, sector_size));
1967                         scsi_set_resid(SCpnt, resid);
1968                 }
1969         }
1970
1971         if (result) {
1972                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1973                 if (sense_valid)
1974                         sense_deferred = scsi_sense_is_deferred(&sshdr);
1975         }
1976         sdkp->medium_access_timed_out = 0;
1977
1978         if (!scsi_status_is_check_condition(result) &&
1979             (!sense_valid || sense_deferred))
1980                 goto out;
1981
1982         switch (sshdr.sense_key) {
1983         case HARDWARE_ERROR:
1984         case MEDIUM_ERROR:
1985                 good_bytes = sd_completed_bytes(SCpnt);
1986                 break;
1987         case RECOVERED_ERROR:
1988                 good_bytes = scsi_bufflen(SCpnt);
1989                 break;
1990         case NO_SENSE:
1991                 /* This indicates a false check condition, so ignore it.  An
1992                  * unknown amount of data was transferred so treat it as an
1993                  * error.
1994                  */
1995                 SCpnt->result = 0;
1996                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1997                 break;
1998         case ABORTED_COMMAND:
1999                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2000                         good_bytes = sd_completed_bytes(SCpnt);
2001                 break;
2002         case ILLEGAL_REQUEST:
2003                 switch (sshdr.asc) {
2004                 case 0x10:      /* DIX: Host detected corruption */
2005                         good_bytes = sd_completed_bytes(SCpnt);
2006                         break;
2007                 case 0x20:      /* INVALID COMMAND OPCODE */
2008                 case 0x24:      /* INVALID FIELD IN CDB */
2009                         switch (SCpnt->cmnd[0]) {
2010                         case UNMAP:
2011                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2012                                 break;
2013                         case WRITE_SAME_16:
2014                         case WRITE_SAME:
2015                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2016                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2017                                 } else {
2018                                         sdkp->device->no_write_same = 1;
2019                                         sd_config_write_same(sdkp);
2020                                         req->rq_flags |= RQF_QUIET;
2021                                 }
2022                                 break;
2023                         }
2024                 }
2025                 break;
2026         default:
2027                 break;
2028         }
2029
2030  out:
2031         if (sd_is_zoned(sdkp))
2032                 good_bytes = sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2033
2034         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2035                                            "sd_done: completed %d of %d bytes\n",
2036                                            good_bytes, scsi_bufflen(SCpnt)));
2037
2038         return good_bytes;
2039 }
2040
2041 /*
2042  * spinup disk - called only in sd_revalidate_disk()
2043  */
2044 static void
2045 sd_spinup_disk(struct scsi_disk *sdkp)
2046 {
2047         unsigned char cmd[10];
2048         unsigned long spintime_expire = 0;
2049         int retries, spintime;
2050         unsigned int the_result;
2051         struct scsi_sense_hdr sshdr;
2052         int sense_valid = 0;
2053
2054         spintime = 0;
2055
2056         /* Spin up drives, as required.  Only do this at boot time */
2057         /* Spinup needs to be done for module loads too. */
2058         do {
2059                 retries = 0;
2060
2061                 do {
2062                         bool media_was_present = sdkp->media_present;
2063
2064                         cmd[0] = TEST_UNIT_READY;
2065                         memset((void *) &cmd[1], 0, 9);
2066
2067                         the_result = scsi_execute_req(sdkp->device, cmd,
2068                                                       DMA_NONE, NULL, 0,
2069                                                       &sshdr, SD_TIMEOUT,
2070                                                       sdkp->max_retries, NULL);
2071
2072                         /*
2073                          * If the drive has indicated to us that it
2074                          * doesn't have any media in it, don't bother
2075                          * with any more polling.
2076                          */
2077                         if (media_not_present(sdkp, &sshdr)) {
2078                                 if (media_was_present)
2079                                         sd_printk(KERN_NOTICE, sdkp, "Media removed, stopped polling\n");
2080                                 return;
2081                         }
2082
2083                         if (the_result)
2084                                 sense_valid = scsi_sense_valid(&sshdr);
2085                         retries++;
2086                 } while (retries < 3 &&
2087                          (!scsi_status_is_good(the_result) ||
2088                           (scsi_status_is_check_condition(the_result) &&
2089                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2090
2091                 if (!scsi_status_is_check_condition(the_result)) {
2092                         /* no sense, TUR either succeeded or failed
2093                          * with a status error */
2094                         if(!spintime && !scsi_status_is_good(the_result)) {
2095                                 sd_print_result(sdkp, "Test Unit Ready failed",
2096                                                 the_result);
2097                         }
2098                         break;
2099                 }
2100
2101                 /*
2102                  * The device does not want the automatic start to be issued.
2103                  */
2104                 if (sdkp->device->no_start_on_add)
2105                         break;
2106
2107                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2108                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2109                                 break;  /* manual intervention required */
2110                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2111                                 break;  /* standby */
2112                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2113                                 break;  /* unavailable */
2114                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2115                                 break;  /* sanitize in progress */
2116                         /*
2117                          * Issue command to spin up drive when not ready
2118                          */
2119                         if (!spintime) {
2120                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2121                                 cmd[0] = START_STOP;
2122                                 cmd[1] = 1;     /* Return immediately */
2123                                 memset((void *) &cmd[2], 0, 8);
2124                                 cmd[4] = 1;     /* Start spin cycle */
2125                                 if (sdkp->device->start_stop_pwr_cond)
2126                                         cmd[4] |= 1 << 4;
2127                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2128                                                  NULL, 0, &sshdr,
2129                                                  SD_TIMEOUT, sdkp->max_retries,
2130                                                  NULL);
2131                                 spintime_expire = jiffies + 100 * HZ;
2132                                 spintime = 1;
2133                         }
2134                         /* Wait 1 second for next try */
2135                         msleep(1000);
2136                         printk(KERN_CONT ".");
2137
2138                 /*
2139                  * Wait for USB flash devices with slow firmware.
2140                  * Yes, this sense key/ASC combination shouldn't
2141                  * occur here.  It's characteristic of these devices.
2142                  */
2143                 } else if (sense_valid &&
2144                                 sshdr.sense_key == UNIT_ATTENTION &&
2145                                 sshdr.asc == 0x28) {
2146                         if (!spintime) {
2147                                 spintime_expire = jiffies + 5 * HZ;
2148                                 spintime = 1;
2149                         }
2150                         /* Wait 1 second for next try */
2151                         msleep(1000);
2152                 } else {
2153                         /* we don't understand the sense code, so it's
2154                          * probably pointless to loop */
2155                         if(!spintime) {
2156                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2157                                 sd_print_sense_hdr(sdkp, &sshdr);
2158                         }
2159                         break;
2160                 }
2161
2162         } while (spintime && time_before_eq(jiffies, spintime_expire));
2163
2164         if (spintime) {
2165                 if (scsi_status_is_good(the_result))
2166                         printk(KERN_CONT "ready\n");
2167                 else
2168                         printk(KERN_CONT "not responding...\n");
2169         }
2170 }
2171
2172 /*
2173  * Determine whether disk supports Data Integrity Field.
2174  */
2175 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2176 {
2177         struct scsi_device *sdp = sdkp->device;
2178         u8 type;
2179         int ret = 0;
2180
2181         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) {
2182                 sdkp->protection_type = 0;
2183                 return ret;
2184         }
2185
2186         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2187
2188         if (type > T10_PI_TYPE3_PROTECTION)
2189                 ret = -ENODEV;
2190         else if (scsi_host_dif_capable(sdp->host, type))
2191                 ret = 1;
2192
2193         if (sdkp->first_scan || type != sdkp->protection_type)
2194                 switch (ret) {
2195                 case -ENODEV:
2196                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2197                                   " protection type %u. Disabling disk!\n",
2198                                   type);
2199                         break;
2200                 case 1:
2201                         sd_printk(KERN_NOTICE, sdkp,
2202                                   "Enabling DIF Type %u protection\n", type);
2203                         break;
2204                 case 0:
2205                         sd_printk(KERN_NOTICE, sdkp,
2206                                   "Disabling DIF Type %u protection\n", type);
2207                         break;
2208                 }
2209
2210         sdkp->protection_type = type;
2211
2212         return ret;
2213 }
2214
2215 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2216                         struct scsi_sense_hdr *sshdr, int sense_valid,
2217                         int the_result)
2218 {
2219         if (sense_valid)
2220                 sd_print_sense_hdr(sdkp, sshdr);
2221         else
2222                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2223
2224         /*
2225          * Set dirty bit for removable devices if not ready -
2226          * sometimes drives will not report this properly.
2227          */
2228         if (sdp->removable &&
2229             sense_valid && sshdr->sense_key == NOT_READY)
2230                 set_media_not_present(sdkp);
2231
2232         /*
2233          * We used to set media_present to 0 here to indicate no media
2234          * in the drive, but some drives fail read capacity even with
2235          * media present, so we can't do that.
2236          */
2237         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2238 }
2239
2240 #define RC16_LEN 32
2241 #if RC16_LEN > SD_BUF_SIZE
2242 #error RC16_LEN must not be more than SD_BUF_SIZE
2243 #endif
2244
2245 #define READ_CAPACITY_RETRIES_ON_RESET  10
2246
2247 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2248                                                 unsigned char *buffer)
2249 {
2250         unsigned char cmd[16];
2251         struct scsi_sense_hdr sshdr;
2252         int sense_valid = 0;
2253         int the_result;
2254         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2255         unsigned int alignment;
2256         unsigned long long lba;
2257         unsigned sector_size;
2258
2259         if (sdp->no_read_capacity_16)
2260                 return -EINVAL;
2261
2262         do {
2263                 memset(cmd, 0, 16);
2264                 cmd[0] = SERVICE_ACTION_IN_16;
2265                 cmd[1] = SAI_READ_CAPACITY_16;
2266                 cmd[13] = RC16_LEN;
2267                 memset(buffer, 0, RC16_LEN);
2268
2269                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2270                                         buffer, RC16_LEN, &sshdr,
2271                                         SD_TIMEOUT, sdkp->max_retries, NULL);
2272
2273                 if (media_not_present(sdkp, &sshdr))
2274                         return -ENODEV;
2275
2276                 if (the_result > 0) {
2277                         sense_valid = scsi_sense_valid(&sshdr);
2278                         if (sense_valid &&
2279                             sshdr.sense_key == ILLEGAL_REQUEST &&
2280                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2281                             sshdr.ascq == 0x00)
2282                                 /* Invalid Command Operation Code or
2283                                  * Invalid Field in CDB, just retry
2284                                  * silently with RC10 */
2285                                 return -EINVAL;
2286                         if (sense_valid &&
2287                             sshdr.sense_key == UNIT_ATTENTION &&
2288                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2289                                 /* Device reset might occur several times,
2290                                  * give it one more chance */
2291                                 if (--reset_retries > 0)
2292                                         continue;
2293                 }
2294                 retries--;
2295
2296         } while (the_result && retries);
2297
2298         if (the_result) {
2299                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2300                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2301                 return -EINVAL;
2302         }
2303
2304         sector_size = get_unaligned_be32(&buffer[8]);
2305         lba = get_unaligned_be64(&buffer[0]);
2306
2307         if (sd_read_protection_type(sdkp, buffer) < 0) {
2308                 sdkp->capacity = 0;
2309                 return -ENODEV;
2310         }
2311
2312         /* Logical blocks per physical block exponent */
2313         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2314
2315         /* RC basis */
2316         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2317
2318         /* Lowest aligned logical block */
2319         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2320         blk_queue_alignment_offset(sdp->request_queue, alignment);
2321         if (alignment && sdkp->first_scan)
2322                 sd_printk(KERN_NOTICE, sdkp,
2323                           "physical block alignment offset: %u\n", alignment);
2324
2325         if (buffer[14] & 0x80) { /* LBPME */
2326                 sdkp->lbpme = 1;
2327
2328                 if (buffer[14] & 0x40) /* LBPRZ */
2329                         sdkp->lbprz = 1;
2330
2331                 sd_config_discard(sdkp, SD_LBP_WS16);
2332         }
2333
2334         sdkp->capacity = lba + 1;
2335         return sector_size;
2336 }
2337
2338 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2339                                                 unsigned char *buffer)
2340 {
2341         unsigned char cmd[16];
2342         struct scsi_sense_hdr sshdr;
2343         int sense_valid = 0;
2344         int the_result;
2345         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2346         sector_t lba;
2347         unsigned sector_size;
2348
2349         do {
2350                 cmd[0] = READ_CAPACITY;
2351                 memset(&cmd[1], 0, 9);
2352                 memset(buffer, 0, 8);
2353
2354                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2355                                         buffer, 8, &sshdr,
2356                                         SD_TIMEOUT, sdkp->max_retries, NULL);
2357
2358                 if (media_not_present(sdkp, &sshdr))
2359                         return -ENODEV;
2360
2361                 if (the_result > 0) {
2362                         sense_valid = scsi_sense_valid(&sshdr);
2363                         if (sense_valid &&
2364                             sshdr.sense_key == UNIT_ATTENTION &&
2365                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2366                                 /* Device reset might occur several times,
2367                                  * give it one more chance */
2368                                 if (--reset_retries > 0)
2369                                         continue;
2370                 }
2371                 retries--;
2372
2373         } while (the_result && retries);
2374
2375         if (the_result) {
2376                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2377                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2378                 return -EINVAL;
2379         }
2380
2381         sector_size = get_unaligned_be32(&buffer[4]);
2382         lba = get_unaligned_be32(&buffer[0]);
2383
2384         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2385                 /* Some buggy (usb cardreader) devices return an lba of
2386                    0xffffffff when the want to report a size of 0 (with
2387                    which they really mean no media is present) */
2388                 sdkp->capacity = 0;
2389                 sdkp->physical_block_size = sector_size;
2390                 return sector_size;
2391         }
2392
2393         sdkp->capacity = lba + 1;
2394         sdkp->physical_block_size = sector_size;
2395         return sector_size;
2396 }
2397
2398 static int sd_try_rc16_first(struct scsi_device *sdp)
2399 {
2400         if (sdp->host->max_cmd_len < 16)
2401                 return 0;
2402         if (sdp->try_rc_10_first)
2403                 return 0;
2404         if (sdp->scsi_level > SCSI_SPC_2)
2405                 return 1;
2406         if (scsi_device_protection(sdp))
2407                 return 1;
2408         return 0;
2409 }
2410
2411 /*
2412  * read disk capacity
2413  */
2414 static void
2415 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2416 {
2417         int sector_size;
2418         struct scsi_device *sdp = sdkp->device;
2419
2420         if (sd_try_rc16_first(sdp)) {
2421                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2422                 if (sector_size == -EOVERFLOW)
2423                         goto got_data;
2424                 if (sector_size == -ENODEV)
2425                         return;
2426                 if (sector_size < 0)
2427                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2428                 if (sector_size < 0)
2429                         return;
2430         } else {
2431                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2432                 if (sector_size == -EOVERFLOW)
2433                         goto got_data;
2434                 if (sector_size < 0)
2435                         return;
2436                 if ((sizeof(sdkp->capacity) > 4) &&
2437                     (sdkp->capacity > 0xffffffffULL)) {
2438                         int old_sector_size = sector_size;
2439                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2440                                         "Trying to use READ CAPACITY(16).\n");
2441                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2442                         if (sector_size < 0) {
2443                                 sd_printk(KERN_NOTICE, sdkp,
2444                                         "Using 0xffffffff as device size\n");
2445                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2446                                 sector_size = old_sector_size;
2447                                 goto got_data;
2448                         }
2449                         /* Remember that READ CAPACITY(16) succeeded */
2450                         sdp->try_rc_10_first = 0;
2451                 }
2452         }
2453
2454         /* Some devices are known to return the total number of blocks,
2455          * not the highest block number.  Some devices have versions
2456          * which do this and others which do not.  Some devices we might
2457          * suspect of doing this but we don't know for certain.
2458          *
2459          * If we know the reported capacity is wrong, decrement it.  If
2460          * we can only guess, then assume the number of blocks is even
2461          * (usually true but not always) and err on the side of lowering
2462          * the capacity.
2463          */
2464         if (sdp->fix_capacity ||
2465             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2466                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2467                                 "from its reported value: %llu\n",
2468                                 (unsigned long long) sdkp->capacity);
2469                 --sdkp->capacity;
2470         }
2471
2472 got_data:
2473         if (sector_size == 0) {
2474                 sector_size = 512;
2475                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2476                           "assuming 512.\n");
2477         }
2478
2479         if (sector_size != 512 &&
2480             sector_size != 1024 &&
2481             sector_size != 2048 &&
2482             sector_size != 4096) {
2483                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2484                           sector_size);
2485                 /*
2486                  * The user might want to re-format the drive with
2487                  * a supported sectorsize.  Once this happens, it
2488                  * would be relatively trivial to set the thing up.
2489                  * For this reason, we leave the thing in the table.
2490                  */
2491                 sdkp->capacity = 0;
2492                 /*
2493                  * set a bogus sector size so the normal read/write
2494                  * logic in the block layer will eventually refuse any
2495                  * request on this device without tripping over power
2496                  * of two sector size assumptions
2497                  */
2498                 sector_size = 512;
2499         }
2500         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2501         blk_queue_physical_block_size(sdp->request_queue,
2502                                       sdkp->physical_block_size);
2503         sdkp->device->sector_size = sector_size;
2504
2505         if (sdkp->capacity > 0xffffffff)
2506                 sdp->use_16_for_rw = 1;
2507
2508 }
2509
2510 /*
2511  * Print disk capacity
2512  */
2513 static void
2514 sd_print_capacity(struct scsi_disk *sdkp,
2515                   sector_t old_capacity)
2516 {
2517         int sector_size = sdkp->device->sector_size;
2518         char cap_str_2[10], cap_str_10[10];
2519
2520         if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2521                 return;
2522
2523         string_get_size(sdkp->capacity, sector_size,
2524                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2525         string_get_size(sdkp->capacity, sector_size,
2526                         STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
2527
2528         sd_printk(KERN_NOTICE, sdkp,
2529                   "%llu %d-byte logical blocks: (%s/%s)\n",
2530                   (unsigned long long)sdkp->capacity,
2531                   sector_size, cap_str_10, cap_str_2);
2532
2533         if (sdkp->physical_block_size != sector_size)
2534                 sd_printk(KERN_NOTICE, sdkp,
2535                           "%u-byte physical blocks\n",
2536                           sdkp->physical_block_size);
2537 }
2538
2539 /* called with buffer of length 512 */
2540 static inline int
2541 sd_do_mode_sense(struct scsi_disk *sdkp, int dbd, int modepage,
2542                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2543                  struct scsi_sense_hdr *sshdr)
2544 {
2545         /*
2546          * If we must use MODE SENSE(10), make sure that the buffer length
2547          * is at least 8 bytes so that the mode sense header fits.
2548          */
2549         if (sdkp->device->use_10_for_ms && len < 8)
2550                 len = 8;
2551
2552         return scsi_mode_sense(sdkp->device, dbd, modepage, buffer, len,
2553                                SD_TIMEOUT, sdkp->max_retries, data,
2554                                sshdr);
2555 }
2556
2557 /*
2558  * read write protect setting, if possible - called only in sd_revalidate_disk()
2559  * called with buffer of length SD_BUF_SIZE
2560  */
2561 static void
2562 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2563 {
2564         int res;
2565         struct scsi_device *sdp = sdkp->device;
2566         struct scsi_mode_data data;
2567         int old_wp = sdkp->write_prot;
2568
2569         set_disk_ro(sdkp->disk, 0);
2570         if (sdp->skip_ms_page_3f) {
2571                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2572                 return;
2573         }
2574
2575         if (sdp->use_192_bytes_for_3f) {
2576                 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 192, &data, NULL);
2577         } else {
2578                 /*
2579                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2580                  * We have to start carefully: some devices hang if we ask
2581                  * for more than is available.
2582                  */
2583                 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 4, &data, NULL);
2584
2585                 /*
2586                  * Second attempt: ask for page 0 When only page 0 is
2587                  * implemented, a request for page 3F may return Sense Key
2588                  * 5: Illegal Request, Sense Code 24: Invalid field in
2589                  * CDB.
2590                  */
2591                 if (res < 0)
2592                         res = sd_do_mode_sense(sdkp, 0, 0, buffer, 4, &data, NULL);
2593
2594                 /*
2595                  * Third attempt: ask 255 bytes, as we did earlier.
2596                  */
2597                 if (res < 0)
2598                         res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 255,
2599                                                &data, NULL);
2600         }
2601
2602         if (res < 0) {
2603                 sd_first_printk(KERN_WARNING, sdkp,
2604                           "Test WP failed, assume Write Enabled\n");
2605         } else {
2606                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2607                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2608                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2609                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2610                                   sdkp->write_prot ? "on" : "off");
2611                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2612                 }
2613         }
2614 }
2615
2616 /*
2617  * sd_read_cache_type - called only from sd_revalidate_disk()
2618  * called with buffer of length SD_BUF_SIZE
2619  */
2620 static void
2621 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2622 {
2623         int len = 0, res;
2624         struct scsi_device *sdp = sdkp->device;
2625
2626         int dbd;
2627         int modepage;
2628         int first_len;
2629         struct scsi_mode_data data;
2630         struct scsi_sense_hdr sshdr;
2631         int old_wce = sdkp->WCE;
2632         int old_rcd = sdkp->RCD;
2633         int old_dpofua = sdkp->DPOFUA;
2634
2635
2636         if (sdkp->cache_override)
2637                 return;
2638
2639         first_len = 4;
2640         if (sdp->skip_ms_page_8) {
2641                 if (sdp->type == TYPE_RBC)
2642                         goto defaults;
2643                 else {
2644                         if (sdp->skip_ms_page_3f)
2645                                 goto defaults;
2646                         modepage = 0x3F;
2647                         if (sdp->use_192_bytes_for_3f)
2648                                 first_len = 192;
2649                         dbd = 0;
2650                 }
2651         } else if (sdp->type == TYPE_RBC) {
2652                 modepage = 6;
2653                 dbd = 8;
2654         } else {
2655                 modepage = 8;
2656                 dbd = 0;
2657         }
2658
2659         /* cautiously ask */
2660         res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, first_len,
2661                         &data, &sshdr);
2662
2663         if (res < 0)
2664                 goto bad_sense;
2665
2666         if (!data.header_length) {
2667                 modepage = 6;
2668                 first_len = 0;
2669                 sd_first_printk(KERN_ERR, sdkp,
2670                                 "Missing header in MODE_SENSE response\n");
2671         }
2672
2673         /* that went OK, now ask for the proper length */
2674         len = data.length;
2675
2676         /*
2677          * We're only interested in the first three bytes, actually.
2678          * But the data cache page is defined for the first 20.
2679          */
2680         if (len < 3)
2681                 goto bad_sense;
2682         else if (len > SD_BUF_SIZE) {
2683                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2684                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2685                 len = SD_BUF_SIZE;
2686         }
2687         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2688                 len = 192;
2689
2690         /* Get the data */
2691         if (len > first_len)
2692                 res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, len,
2693                                 &data, &sshdr);
2694
2695         if (!res) {
2696                 int offset = data.header_length + data.block_descriptor_length;
2697
2698                 while (offset < len) {
2699                         u8 page_code = buffer[offset] & 0x3F;
2700                         u8 spf       = buffer[offset] & 0x40;
2701
2702                         if (page_code == 8 || page_code == 6) {
2703                                 /* We're interested only in the first 3 bytes.
2704                                  */
2705                                 if (len - offset <= 2) {
2706                                         sd_first_printk(KERN_ERR, sdkp,
2707                                                 "Incomplete mode parameter "
2708                                                         "data\n");
2709                                         goto defaults;
2710                                 } else {
2711                                         modepage = page_code;
2712                                         goto Page_found;
2713                                 }
2714                         } else {
2715                                 /* Go to the next page */
2716                                 if (spf && len - offset > 3)
2717                                         offset += 4 + (buffer[offset+2] << 8) +
2718                                                 buffer[offset+3];
2719                                 else if (!spf && len - offset > 1)
2720                                         offset += 2 + buffer[offset+1];
2721                                 else {
2722                                         sd_first_printk(KERN_ERR, sdkp,
2723                                                         "Incomplete mode "
2724                                                         "parameter data\n");
2725                                         goto defaults;
2726                                 }
2727                         }
2728                 }
2729
2730                 sd_first_printk(KERN_WARNING, sdkp,
2731                                 "No Caching mode page found\n");
2732                 goto defaults;
2733
2734         Page_found:
2735                 if (modepage == 8) {
2736                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2737                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2738                 } else {
2739                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2740                         sdkp->RCD = 0;
2741                 }
2742
2743                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2744                 if (sdp->broken_fua) {
2745                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2746                         sdkp->DPOFUA = 0;
2747                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2748                            !sdkp->device->use_16_for_rw) {
2749                         sd_first_printk(KERN_NOTICE, sdkp,
2750                                   "Uses READ/WRITE(6), disabling FUA\n");
2751                         sdkp->DPOFUA = 0;
2752                 }
2753
2754                 /* No cache flush allowed for write protected devices */
2755                 if (sdkp->WCE && sdkp->write_prot)
2756                         sdkp->WCE = 0;
2757
2758                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2759                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2760                         sd_printk(KERN_NOTICE, sdkp,
2761                                   "Write cache: %s, read cache: %s, %s\n",
2762                                   sdkp->WCE ? "enabled" : "disabled",
2763                                   sdkp->RCD ? "disabled" : "enabled",
2764                                   sdkp->DPOFUA ? "supports DPO and FUA"
2765                                   : "doesn't support DPO or FUA");
2766
2767                 return;
2768         }
2769
2770 bad_sense:
2771         if (scsi_sense_valid(&sshdr) &&
2772             sshdr.sense_key == ILLEGAL_REQUEST &&
2773             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2774                 /* Invalid field in CDB */
2775                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2776         else
2777                 sd_first_printk(KERN_ERR, sdkp,
2778                                 "Asking for cache data failed\n");
2779
2780 defaults:
2781         if (sdp->wce_default_on) {
2782                 sd_first_printk(KERN_NOTICE, sdkp,
2783                                 "Assuming drive cache: write back\n");
2784                 sdkp->WCE = 1;
2785         } else {
2786                 sd_first_printk(KERN_WARNING, sdkp,
2787                                 "Assuming drive cache: write through\n");
2788                 sdkp->WCE = 0;
2789         }
2790         sdkp->RCD = 0;
2791         sdkp->DPOFUA = 0;
2792 }
2793
2794 /*
2795  * The ATO bit indicates whether the DIF application tag is available
2796  * for use by the operating system.
2797  */
2798 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2799 {
2800         int res, offset;
2801         struct scsi_device *sdp = sdkp->device;
2802         struct scsi_mode_data data;
2803         struct scsi_sense_hdr sshdr;
2804
2805         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2806                 return;
2807
2808         if (sdkp->protection_type == 0)
2809                 return;
2810
2811         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2812                               sdkp->max_retries, &data, &sshdr);
2813
2814         if (res < 0 || !data.header_length ||
2815             data.length < 6) {
2816                 sd_first_printk(KERN_WARNING, sdkp,
2817                           "getting Control mode page failed, assume no ATO\n");
2818
2819                 if (scsi_sense_valid(&sshdr))
2820                         sd_print_sense_hdr(sdkp, &sshdr);
2821
2822                 return;
2823         }
2824
2825         offset = data.header_length + data.block_descriptor_length;
2826
2827         if ((buffer[offset] & 0x3f) != 0x0a) {
2828                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2829                 return;
2830         }
2831
2832         if ((buffer[offset + 5] & 0x80) == 0)
2833                 return;
2834
2835         sdkp->ATO = 1;
2836
2837         return;
2838 }
2839
2840 /**
2841  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2842  * @sdkp: disk to query
2843  */
2844 static void sd_read_block_limits(struct scsi_disk *sdkp)
2845 {
2846         unsigned int sector_sz = sdkp->device->sector_size;
2847         const int vpd_len = 64;
2848         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2849
2850         if (!buffer ||
2851             /* Block Limits VPD */
2852             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2853                 goto out;
2854
2855         blk_queue_io_min(sdkp->disk->queue,
2856                          get_unaligned_be16(&buffer[6]) * sector_sz);
2857
2858         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2859         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2860
2861         if (buffer[3] == 0x3c) {
2862                 unsigned int lba_count, desc_count;
2863
2864                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2865
2866                 if (!sdkp->lbpme)
2867                         goto out;
2868
2869                 lba_count = get_unaligned_be32(&buffer[20]);
2870                 desc_count = get_unaligned_be32(&buffer[24]);
2871
2872                 if (lba_count && desc_count)
2873                         sdkp->max_unmap_blocks = lba_count;
2874
2875                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2876
2877                 if (buffer[32] & 0x80)
2878                         sdkp->unmap_alignment =
2879                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2880
2881                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2882
2883                         if (sdkp->max_unmap_blocks)
2884                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2885                         else
2886                                 sd_config_discard(sdkp, SD_LBP_WS16);
2887
2888                 } else {        /* LBP VPD page tells us what to use */
2889                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2890                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2891                         else if (sdkp->lbpws)
2892                                 sd_config_discard(sdkp, SD_LBP_WS16);
2893                         else if (sdkp->lbpws10)
2894                                 sd_config_discard(sdkp, SD_LBP_WS10);
2895                         else
2896                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2897                 }
2898         }
2899
2900  out:
2901         kfree(buffer);
2902 }
2903
2904 /**
2905  * sd_read_block_characteristics - Query block dev. characteristics
2906  * @sdkp: disk to query
2907  */
2908 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2909 {
2910         struct request_queue *q = sdkp->disk->queue;
2911         unsigned char *buffer;
2912         u16 rot;
2913         const int vpd_len = 64;
2914
2915         buffer = kmalloc(vpd_len, GFP_KERNEL);
2916
2917         if (!buffer ||
2918             /* Block Device Characteristics VPD */
2919             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2920                 goto out;
2921
2922         rot = get_unaligned_be16(&buffer[4]);
2923
2924         if (rot == 1) {
2925                 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2926                 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2927         }
2928
2929         if (sdkp->device->type == TYPE_ZBC) {
2930                 /* Host-managed */
2931                 blk_queue_set_zoned(sdkp->disk, BLK_ZONED_HM);
2932         } else {
2933                 sdkp->zoned = (buffer[8] >> 4) & 3;
2934                 if (sdkp->zoned == 1) {
2935                         /* Host-aware */
2936                         blk_queue_set_zoned(sdkp->disk, BLK_ZONED_HA);
2937                 } else {
2938                         /* Regular disk or drive managed disk */
2939                         blk_queue_set_zoned(sdkp->disk, BLK_ZONED_NONE);
2940                 }
2941         }
2942
2943         if (!sdkp->first_scan)
2944                 goto out;
2945
2946         if (blk_queue_is_zoned(q)) {
2947                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2948                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2949         } else {
2950                 if (sdkp->zoned == 1)
2951                         sd_printk(KERN_NOTICE, sdkp,
2952                                   "Host-aware SMR disk used as regular disk\n");
2953                 else if (sdkp->zoned == 2)
2954                         sd_printk(KERN_NOTICE, sdkp,
2955                                   "Drive-managed SMR disk\n");
2956         }
2957
2958  out:
2959         kfree(buffer);
2960 }
2961
2962 /**
2963  * sd_read_block_provisioning - Query provisioning VPD page
2964  * @sdkp: disk to query
2965  */
2966 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2967 {
2968         unsigned char *buffer;
2969         const int vpd_len = 8;
2970
2971         if (sdkp->lbpme == 0)
2972                 return;
2973
2974         buffer = kmalloc(vpd_len, GFP_KERNEL);
2975
2976         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2977                 goto out;
2978
2979         sdkp->lbpvpd    = 1;
2980         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2981         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2982         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2983
2984  out:
2985         kfree(buffer);
2986 }
2987
2988 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2989 {
2990         struct scsi_device *sdev = sdkp->device;
2991
2992         if (sdev->host->no_write_same) {
2993                 sdev->no_write_same = 1;
2994
2995                 return;
2996         }
2997
2998         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2999                 /* too large values might cause issues with arcmsr */
3000                 int vpd_buf_len = 64;
3001
3002                 sdev->no_report_opcodes = 1;
3003
3004                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3005                  * CODES is unsupported and the device has an ATA
3006                  * Information VPD page (SAT).
3007                  */
3008                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3009                         sdev->no_write_same = 1;
3010         }
3011
3012         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3013                 sdkp->ws16 = 1;
3014
3015         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3016                 sdkp->ws10 = 1;
3017 }
3018
3019 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3020 {
3021         struct scsi_device *sdev = sdkp->device;
3022
3023         if (!sdev->security_supported)
3024                 return;
3025
3026         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3027                         SECURITY_PROTOCOL_IN) == 1 &&
3028             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3029                         SECURITY_PROTOCOL_OUT) == 1)
3030                 sdkp->security = 1;
3031 }
3032
3033 static inline sector_t sd64_to_sectors(struct scsi_disk *sdkp, u8 *buf)
3034 {
3035         return logical_to_sectors(sdkp->device, get_unaligned_be64(buf));
3036 }
3037
3038 /**
3039  * sd_read_cpr - Query concurrent positioning ranges
3040  * @sdkp:       disk to query
3041  */
3042 static void sd_read_cpr(struct scsi_disk *sdkp)
3043 {
3044         struct blk_independent_access_ranges *iars = NULL;
3045         unsigned char *buffer = NULL;
3046         unsigned int nr_cpr = 0;
3047         int i, vpd_len, buf_len = SD_BUF_SIZE;
3048         u8 *desc;
3049
3050         /*
3051          * We need to have the capacity set first for the block layer to be
3052          * able to check the ranges.
3053          */
3054         if (sdkp->first_scan)
3055                 return;
3056
3057         if (!sdkp->capacity)
3058                 goto out;
3059
3060         /*
3061          * Concurrent Positioning Ranges VPD: there can be at most 256 ranges,
3062          * leading to a maximum page size of 64 + 256*32 bytes.
3063          */
3064         buf_len = 64 + 256*32;
3065         buffer = kmalloc(buf_len, GFP_KERNEL);
3066         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb9, buffer, buf_len))
3067                 goto out;
3068
3069         /* We must have at least a 64B header and one 32B range descriptor */
3070         vpd_len = get_unaligned_be16(&buffer[2]) + 3;
3071         if (vpd_len > buf_len || vpd_len < 64 + 32 || (vpd_len & 31)) {
3072                 sd_printk(KERN_ERR, sdkp,
3073                           "Invalid Concurrent Positioning Ranges VPD page\n");
3074                 goto out;
3075         }
3076
3077         nr_cpr = (vpd_len - 64) / 32;
3078         if (nr_cpr == 1) {
3079                 nr_cpr = 0;
3080                 goto out;
3081         }
3082
3083         iars = disk_alloc_independent_access_ranges(sdkp->disk, nr_cpr);
3084         if (!iars) {
3085                 nr_cpr = 0;
3086                 goto out;
3087         }
3088
3089         desc = &buffer[64];
3090         for (i = 0; i < nr_cpr; i++, desc += 32) {
3091                 if (desc[0] != i) {
3092                         sd_printk(KERN_ERR, sdkp,
3093                                 "Invalid Concurrent Positioning Range number\n");
3094                         nr_cpr = 0;
3095                         break;
3096                 }
3097
3098                 iars->ia_range[i].sector = sd64_to_sectors(sdkp, desc + 8);
3099                 iars->ia_range[i].nr_sectors = sd64_to_sectors(sdkp, desc + 16);
3100         }
3101
3102 out:
3103         disk_set_independent_access_ranges(sdkp->disk, iars);
3104         if (nr_cpr && sdkp->nr_actuators != nr_cpr) {
3105                 sd_printk(KERN_NOTICE, sdkp,
3106                           "%u concurrent positioning ranges\n", nr_cpr);
3107                 sdkp->nr_actuators = nr_cpr;
3108         }
3109
3110         kfree(buffer);
3111 }
3112
3113 /*
3114  * Determine the device's preferred I/O size for reads and writes
3115  * unless the reported value is unreasonably small, large, not a
3116  * multiple of the physical block size, or simply garbage.
3117  */
3118 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3119                                       unsigned int dev_max)
3120 {
3121         struct scsi_device *sdp = sdkp->device;
3122         unsigned int opt_xfer_bytes =
3123                 logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3124
3125         if (sdkp->opt_xfer_blocks == 0)
3126                 return false;
3127
3128         if (sdkp->opt_xfer_blocks > dev_max) {
3129                 sd_first_printk(KERN_WARNING, sdkp,
3130                                 "Optimal transfer size %u logical blocks " \
3131                                 "> dev_max (%u logical blocks)\n",
3132                                 sdkp->opt_xfer_blocks, dev_max);
3133                 return false;
3134         }
3135
3136         if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3137                 sd_first_printk(KERN_WARNING, sdkp,
3138                                 "Optimal transfer size %u logical blocks " \
3139                                 "> sd driver limit (%u logical blocks)\n",
3140                                 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3141                 return false;
3142         }
3143
3144         if (opt_xfer_bytes < PAGE_SIZE) {
3145                 sd_first_printk(KERN_WARNING, sdkp,
3146                                 "Optimal transfer size %u bytes < " \
3147                                 "PAGE_SIZE (%u bytes)\n",
3148                                 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3149                 return false;
3150         }
3151
3152         if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3153                 sd_first_printk(KERN_WARNING, sdkp,
3154                                 "Optimal transfer size %u bytes not a " \
3155                                 "multiple of physical block size (%u bytes)\n",
3156                                 opt_xfer_bytes, sdkp->physical_block_size);
3157                 return false;
3158         }
3159
3160         sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3161                         opt_xfer_bytes);
3162         return true;
3163 }
3164
3165 /**
3166  *      sd_revalidate_disk - called the first time a new disk is seen,
3167  *      performs disk spin up, read_capacity, etc.
3168  *      @disk: struct gendisk we care about
3169  **/
3170 static int sd_revalidate_disk(struct gendisk *disk)
3171 {
3172         struct scsi_disk *sdkp = scsi_disk(disk);
3173         struct scsi_device *sdp = sdkp->device;
3174         struct request_queue *q = sdkp->disk->queue;
3175         sector_t old_capacity = sdkp->capacity;
3176         unsigned char *buffer;
3177         unsigned int dev_max, rw_max;
3178
3179         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3180                                       "sd_revalidate_disk\n"));
3181
3182         /*
3183          * If the device is offline, don't try and read capacity or any
3184          * of the other niceties.
3185          */
3186         if (!scsi_device_online(sdp))
3187                 goto out;
3188
3189         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3190         if (!buffer) {
3191                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3192                           "allocation failure.\n");
3193                 goto out;
3194         }
3195
3196         sd_spinup_disk(sdkp);
3197
3198         /*
3199          * Without media there is no reason to ask; moreover, some devices
3200          * react badly if we do.
3201          */
3202         if (sdkp->media_present) {
3203                 sd_read_capacity(sdkp, buffer);
3204
3205                 /*
3206                  * set the default to rotational.  All non-rotational devices
3207                  * support the block characteristics VPD page, which will
3208                  * cause this to be updated correctly and any device which
3209                  * doesn't support it should be treated as rotational.
3210                  */
3211                 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
3212                 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
3213
3214                 if (scsi_device_supports_vpd(sdp)) {
3215                         sd_read_block_provisioning(sdkp);
3216                         sd_read_block_limits(sdkp);
3217                         sd_read_block_characteristics(sdkp);
3218                         sd_zbc_read_zones(sdkp, buffer);
3219                         sd_read_cpr(sdkp);
3220                 }
3221
3222                 sd_print_capacity(sdkp, old_capacity);
3223
3224                 sd_read_write_protect_flag(sdkp, buffer);
3225                 sd_read_cache_type(sdkp, buffer);
3226                 sd_read_app_tag_own(sdkp, buffer);
3227                 sd_read_write_same(sdkp, buffer);
3228                 sd_read_security(sdkp, buffer);
3229         }
3230
3231         /*
3232          * We now have all cache related info, determine how we deal
3233          * with flush requests.
3234          */
3235         sd_set_flush_flag(sdkp);
3236
3237         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3238         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3239
3240         /* Some devices report a maximum block count for READ/WRITE requests. */
3241         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3242         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3243
3244         if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3245                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3246                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3247         } else {
3248                 q->limits.io_opt = 0;
3249                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3250                                       (sector_t)BLK_DEF_MAX_SECTORS);
3251         }
3252
3253         /* Do not exceed controller limit */
3254         rw_max = min(rw_max, queue_max_hw_sectors(q));
3255
3256         /*
3257          * Only update max_sectors if previously unset or if the current value
3258          * exceeds the capabilities of the hardware.
3259          */
3260         if (sdkp->first_scan ||
3261             q->limits.max_sectors > q->limits.max_dev_sectors ||
3262             q->limits.max_sectors > q->limits.max_hw_sectors)
3263                 q->limits.max_sectors = rw_max;
3264
3265         sdkp->first_scan = 0;
3266
3267         set_capacity_and_notify(disk, logical_to_sectors(sdp, sdkp->capacity));
3268         sd_config_write_same(sdkp);
3269         kfree(buffer);
3270
3271         /*
3272          * For a zoned drive, revalidating the zones can be done only once
3273          * the gendisk capacity is set. So if this fails, set back the gendisk
3274          * capacity to 0.
3275          */
3276         if (sd_zbc_revalidate_zones(sdkp))
3277                 set_capacity_and_notify(disk, 0);
3278
3279  out:
3280         return 0;
3281 }
3282
3283 /**
3284  *      sd_unlock_native_capacity - unlock native capacity
3285  *      @disk: struct gendisk to set capacity for
3286  *
3287  *      Block layer calls this function if it detects that partitions
3288  *      on @disk reach beyond the end of the device.  If the SCSI host
3289  *      implements ->unlock_native_capacity() method, it's invoked to
3290  *      give it a chance to adjust the device capacity.
3291  *
3292  *      CONTEXT:
3293  *      Defined by block layer.  Might sleep.
3294  */
3295 static void sd_unlock_native_capacity(struct gendisk *disk)
3296 {
3297         struct scsi_device *sdev = scsi_disk(disk)->device;
3298
3299         if (sdev->host->hostt->unlock_native_capacity)
3300                 sdev->host->hostt->unlock_native_capacity(sdev);
3301 }
3302
3303 /**
3304  *      sd_format_disk_name - format disk name
3305  *      @prefix: name prefix - ie. "sd" for SCSI disks
3306  *      @index: index of the disk to format name for
3307  *      @buf: output buffer
3308  *      @buflen: length of the output buffer
3309  *
3310  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3311  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3312  *      which is followed by sdaaa.
3313  *
3314  *      This is basically 26 base counting with one extra 'nil' entry
3315  *      at the beginning from the second digit on and can be
3316  *      determined using similar method as 26 base conversion with the
3317  *      index shifted -1 after each digit is computed.
3318  *
3319  *      CONTEXT:
3320  *      Don't care.
3321  *
3322  *      RETURNS:
3323  *      0 on success, -errno on failure.
3324  */
3325 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3326 {
3327         const int base = 'z' - 'a' + 1;
3328         char *begin = buf + strlen(prefix);
3329         char *end = buf + buflen;
3330         char *p;
3331         int unit;
3332
3333         p = end - 1;
3334         *p = '\0';
3335         unit = base;
3336         do {
3337                 if (p == begin)
3338                         return -EINVAL;
3339                 *--p = 'a' + (index % unit);
3340                 index = (index / unit) - 1;
3341         } while (index >= 0);
3342
3343         memmove(begin, p, end - p);
3344         memcpy(buf, prefix, strlen(prefix));
3345
3346         return 0;
3347 }
3348
3349 /**
3350  *      sd_probe - called during driver initialization and whenever a
3351  *      new scsi device is attached to the system. It is called once
3352  *      for each scsi device (not just disks) present.
3353  *      @dev: pointer to device object
3354  *
3355  *      Returns 0 if successful (or not interested in this scsi device
3356  *      (e.g. scanner)); 1 when there is an error.
3357  *
3358  *      Note: this function is invoked from the scsi mid-level.
3359  *      This function sets up the mapping between a given
3360  *      <host,channel,id,lun> (found in sdp) and new device name
3361  *      (e.g. /dev/sda). More precisely it is the block device major
3362  *      and minor number that is chosen here.
3363  *
3364  *      Assume sd_probe is not re-entrant (for time being)
3365  *      Also think about sd_probe() and sd_remove() running coincidentally.
3366  **/
3367 static int sd_probe(struct device *dev)
3368 {
3369         struct scsi_device *sdp = to_scsi_device(dev);
3370         struct scsi_disk *sdkp;
3371         struct gendisk *gd;
3372         int index;
3373         int error;
3374
3375         scsi_autopm_get_device(sdp);
3376         error = -ENODEV;
3377         if (sdp->type != TYPE_DISK &&
3378             sdp->type != TYPE_ZBC &&
3379             sdp->type != TYPE_MOD &&
3380             sdp->type != TYPE_RBC)
3381                 goto out;
3382
3383         if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) && sdp->type == TYPE_ZBC) {
3384                 sdev_printk(KERN_WARNING, sdp,
3385                             "Unsupported ZBC host-managed device.\n");
3386                 goto out;
3387         }
3388
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_node(sdp->request_queue, NUMA_NO_NODE,
3398                                &sd_bio_compl_lkclass);
3399         if (!gd)
3400                 goto out_free;
3401
3402         index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3403         if (index < 0) {
3404                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3405                 goto out_put;
3406         }
3407
3408         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3409         if (error) {
3410                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3411                 goto out_free_index;
3412         }
3413
3414         sdkp->device = sdp;
3415         sdkp->disk = gd;
3416         sdkp->index = index;
3417         sdkp->max_retries = SD_MAX_RETRIES;
3418         atomic_set(&sdkp->openers, 0);
3419         atomic_set(&sdkp->device->ioerr_cnt, 0);
3420
3421         if (!sdp->request_queue->rq_timeout) {
3422                 if (sdp->type != TYPE_MOD)
3423                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3424                 else
3425                         blk_queue_rq_timeout(sdp->request_queue,
3426                                              SD_MOD_TIMEOUT);
3427         }
3428
3429         device_initialize(&sdkp->disk_dev);
3430         sdkp->disk_dev.parent = get_device(dev);
3431         sdkp->disk_dev.class = &sd_disk_class;
3432         dev_set_name(&sdkp->disk_dev, "%s", dev_name(dev));
3433
3434         error = device_add(&sdkp->disk_dev);
3435         if (error) {
3436                 put_device(&sdkp->disk_dev);
3437                 goto out;
3438         }
3439
3440         dev_set_drvdata(dev, sdkp);
3441
3442         gd->major = sd_major((index & 0xf0) >> 4);
3443         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3444         gd->minors = SD_MINORS;
3445
3446         gd->fops = &sd_fops;
3447         gd->private_data = sdkp;
3448
3449         /* defaults, until the device tells us otherwise */
3450         sdp->sector_size = 512;
3451         sdkp->capacity = 0;
3452         sdkp->media_present = 1;
3453         sdkp->write_prot = 0;
3454         sdkp->cache_override = 0;
3455         sdkp->WCE = 0;
3456         sdkp->RCD = 0;
3457         sdkp->ATO = 0;
3458         sdkp->first_scan = 1;
3459         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3460
3461         sd_revalidate_disk(gd);
3462
3463         if (sdp->removable) {
3464                 gd->flags |= GENHD_FL_REMOVABLE;
3465                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3466                 gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
3467         }
3468
3469         blk_pm_runtime_init(sdp->request_queue, dev);
3470         if (sdp->rpm_autosuspend) {
3471                 pm_runtime_set_autosuspend_delay(dev,
3472                         sdp->host->hostt->rpm_autosuspend_delay);
3473         }
3474
3475         error = device_add_disk(dev, gd, NULL);
3476         if (error) {
3477                 put_device(&sdkp->disk_dev);
3478                 blk_cleanup_disk(gd);
3479                 goto out;
3480         }
3481
3482         if (sdkp->capacity)
3483                 sd_dif_config_host(sdkp);
3484
3485         sd_revalidate_disk(gd);
3486
3487         if (sdkp->security) {
3488                 sdkp->opal_dev = init_opal_dev(sdkp, &sd_sec_submit);
3489                 if (sdkp->opal_dev)
3490                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3491         }
3492
3493         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3494                   sdp->removable ? "removable " : "");
3495         scsi_autopm_put_device(sdp);
3496
3497         return 0;
3498
3499  out_free_index:
3500         ida_free(&sd_index_ida, index);
3501  out_put:
3502         put_disk(gd);
3503  out_free:
3504         sd_zbc_release_disk(sdkp);
3505         kfree(sdkp);
3506  out:
3507         scsi_autopm_put_device(sdp);
3508         return error;
3509 }
3510
3511 /**
3512  *      sd_remove - called whenever a scsi disk (previously recognized by
3513  *      sd_probe) is detached from the system. It is called (potentially
3514  *      multiple times) during sd module unload.
3515  *      @dev: pointer to device object
3516  *
3517  *      Note: this function is invoked from the scsi mid-level.
3518  *      This function potentially frees up a device name (e.g. /dev/sdc)
3519  *      that could be re-used by a subsequent sd_probe().
3520  *      This function is not called when the built-in sd driver is "exit-ed".
3521  **/
3522 static int sd_remove(struct device *dev)
3523 {
3524         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3525
3526         scsi_autopm_get_device(sdkp->device);
3527
3528         device_del(&sdkp->disk_dev);
3529         del_gendisk(sdkp->disk);
3530         sd_shutdown(dev);
3531
3532         put_disk(sdkp->disk);
3533         return 0;
3534 }
3535
3536 static void scsi_disk_release(struct device *dev)
3537 {
3538         struct scsi_disk *sdkp = to_scsi_disk(dev);
3539
3540         ida_free(&sd_index_ida, sdkp->index);
3541         sd_zbc_release_disk(sdkp);
3542         put_device(&sdkp->device->sdev_gendev);
3543         free_opal_dev(sdkp->opal_dev);
3544
3545         kfree(sdkp);
3546 }
3547
3548 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3549 {
3550         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3551         struct scsi_sense_hdr sshdr;
3552         struct scsi_device *sdp = sdkp->device;
3553         int res;
3554
3555         if (start)
3556                 cmd[4] |= 1;    /* START */
3557
3558         if (sdp->start_stop_pwr_cond)
3559                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3560
3561         if (!scsi_device_online(sdp))
3562                 return -ENODEV;
3563
3564         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3565                         SD_TIMEOUT, sdkp->max_retries, 0, RQF_PM, NULL);
3566         if (res) {
3567                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3568                 if (res > 0 && scsi_sense_valid(&sshdr)) {
3569                         sd_print_sense_hdr(sdkp, &sshdr);
3570                         /* 0x3a is medium not present */
3571                         if (sshdr.asc == 0x3a)
3572                                 res = 0;
3573                 }
3574         }
3575
3576         /* SCSI error codes must not go to the generic layer */
3577         if (res)
3578                 return -EIO;
3579
3580         return 0;
3581 }
3582
3583 /*
3584  * Send a SYNCHRONIZE CACHE instruction down to the device through
3585  * the normal SCSI command structure.  Wait for the command to
3586  * complete.
3587  */
3588 static void sd_shutdown(struct device *dev)
3589 {
3590         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3591
3592         if (!sdkp)
3593                 return;         /* this can happen */
3594
3595         if (pm_runtime_suspended(dev))
3596                 return;
3597
3598         if (sdkp->WCE && sdkp->media_present) {
3599                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3600                 sd_sync_cache(sdkp, NULL);
3601         }
3602
3603         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3604                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3605                 sd_start_stop_device(sdkp, 0);
3606         }
3607 }
3608
3609 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3610 {
3611         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3612         struct scsi_sense_hdr sshdr;
3613         int ret = 0;
3614
3615         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3616                 return 0;
3617
3618         if (sdkp->WCE && sdkp->media_present) {
3619                 if (!sdkp->device->silence_suspend)
3620                         sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3621                 ret = sd_sync_cache(sdkp, &sshdr);
3622
3623                 if (ret) {
3624                         /* ignore OFFLINE device */
3625                         if (ret == -ENODEV)
3626                                 return 0;
3627
3628                         if (!scsi_sense_valid(&sshdr) ||
3629                             sshdr.sense_key != ILLEGAL_REQUEST)
3630                                 return ret;
3631
3632                         /*
3633                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3634                          * doesn't support sync. There's not much to do and
3635                          * suspend shouldn't fail.
3636                          */
3637                         ret = 0;
3638                 }
3639         }
3640
3641         if (sdkp->device->manage_start_stop) {
3642                 if (!sdkp->device->silence_suspend)
3643                         sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3644                 /* an error is not worth aborting a system sleep */
3645                 ret = sd_start_stop_device(sdkp, 0);
3646                 if (ignore_stop_errors)
3647                         ret = 0;
3648         }
3649
3650         return ret;
3651 }
3652
3653 static int sd_suspend_system(struct device *dev)
3654 {
3655         if (pm_runtime_suspended(dev))
3656                 return 0;
3657
3658         return sd_suspend_common(dev, true);
3659 }
3660
3661 static int sd_suspend_runtime(struct device *dev)
3662 {
3663         return sd_suspend_common(dev, false);
3664 }
3665
3666 static int sd_resume(struct device *dev)
3667 {
3668         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3669         int ret;
3670
3671         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3672                 return 0;
3673
3674         if (!sdkp->device->manage_start_stop)
3675                 return 0;
3676
3677         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3678         ret = sd_start_stop_device(sdkp, 1);
3679         if (!ret)
3680                 opal_unlock_from_suspend(sdkp->opal_dev);
3681         return ret;
3682 }
3683
3684 static int sd_resume_system(struct device *dev)
3685 {
3686         if (pm_runtime_suspended(dev))
3687                 return 0;
3688
3689         return sd_resume(dev);
3690 }
3691
3692 static int sd_resume_runtime(struct device *dev)
3693 {
3694         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3695         struct scsi_device *sdp;
3696
3697         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3698                 return 0;
3699
3700         sdp = sdkp->device;
3701
3702         if (sdp->ignore_media_change) {
3703                 /* clear the device's sense data */
3704                 static const u8 cmd[10] = { REQUEST_SENSE };
3705
3706                 if (scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL,
3707                                  NULL, sdp->request_queue->rq_timeout, 1, 0,
3708                                  RQF_PM, NULL))
3709                         sd_printk(KERN_NOTICE, sdkp,
3710                                   "Failed to clear sense data\n");
3711         }
3712
3713         return sd_resume(dev);
3714 }
3715
3716 /**
3717  *      init_sd - entry point for this driver (both when built in or when
3718  *      a module).
3719  *
3720  *      Note: this function registers this driver with the scsi mid-level.
3721  **/
3722 static int __init init_sd(void)
3723 {
3724         int majors = 0, i, err;
3725
3726         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3727
3728         for (i = 0; i < SD_MAJORS; i++) {
3729                 if (__register_blkdev(sd_major(i), "sd", sd_default_probe))
3730                         continue;
3731                 majors++;
3732         }
3733
3734         if (!majors)
3735                 return -ENODEV;
3736
3737         err = class_register(&sd_disk_class);
3738         if (err)
3739                 goto err_out;
3740
3741         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3742                                          0, 0, NULL);
3743         if (!sd_cdb_cache) {
3744                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3745                 err = -ENOMEM;
3746                 goto err_out_class;
3747         }
3748
3749         sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
3750         if (!sd_page_pool) {
3751                 printk(KERN_ERR "sd: can't init discard page pool\n");
3752                 err = -ENOMEM;
3753                 goto err_out_cache;
3754         }
3755
3756         err = scsi_register_driver(&sd_template.gendrv);
3757         if (err)
3758                 goto err_out_driver;
3759
3760         return 0;
3761
3762 err_out_driver:
3763         mempool_destroy(sd_page_pool);
3764
3765 err_out_cache:
3766         kmem_cache_destroy(sd_cdb_cache);
3767
3768 err_out_class:
3769         class_unregister(&sd_disk_class);
3770 err_out:
3771         for (i = 0; i < SD_MAJORS; i++)
3772                 unregister_blkdev(sd_major(i), "sd");
3773         return err;
3774 }
3775
3776 /**
3777  *      exit_sd - exit point for this driver (when it is a module).
3778  *
3779  *      Note: this function unregisters this driver from the scsi mid-level.
3780  **/
3781 static void __exit exit_sd(void)
3782 {
3783         int i;
3784
3785         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3786
3787         scsi_unregister_driver(&sd_template.gendrv);
3788         mempool_destroy(sd_page_pool);
3789         kmem_cache_destroy(sd_cdb_cache);
3790
3791         class_unregister(&sd_disk_class);
3792
3793         for (i = 0; i < SD_MAJORS; i++)
3794                 unregister_blkdev(sd_major(i), "sd");
3795 }
3796
3797 module_init(init_sd);
3798 module_exit(exit_sd);
3799
3800 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
3801 {
3802         scsi_print_sense_hdr(sdkp->device,
3803                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3804 }
3805
3806 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result)
3807 {
3808         const char *hb_string = scsi_hostbyte_string(result);
3809
3810         if (hb_string)
3811                 sd_printk(KERN_INFO, sdkp,
3812                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3813                           hb_string ? hb_string : "invalid",
3814                           "DRIVER_OK");
3815         else
3816                 sd_printk(KERN_INFO, sdkp,
3817                           "%s: Result: hostbyte=0x%02x driverbyte=%s\n",
3818                           msg, host_byte(result), "DRIVER_OK");
3819 }