drivers/scsi/sd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      sd.c Copyright (C) 1992 Drew Eckhardt
   4  *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   5  *
   6  *      Linux scsi disk driver
   7  *              Initial versions: Drew Eckhardt
   8  *              Subsequent revisions: Eric Youngdale
   9  *      Modification history:
  10  *       - Drew Eckhardt <drew@colorado.edu> original
  11  *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
  12  *         outstanding request, and other enhancements.
  13  *         Support loadable low-level scsi drivers.
  14  *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
  15  *         eight major numbers.
  16  *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  17  *       - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
  18  *         sd_init and cleanups.
  19  *       - Alex Davis <letmein@erols.com> Fix problem where partition info
  20  *         not being read in sd_open. Fix problem where removable media
  21  *         could be ejected after sd_open.
  22  *       - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  23  *       - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
  24  *         <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
  25  *         Support 32k/1M disks.
  26  *
  27  *      Logging policy (needs CONFIG_SCSI_LOGGING defined):
  28  *       - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  29  *       - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  30  *       - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  31  *       - entering other commands: SCSI_LOG_HLQUEUE level 3
  32  *      Note: when the logging level is set by the user, it must be greater
  33  *      than the level indicated above to trigger output.
  34  */
  35
  36 #include <linux/module.h>
  37 #include <linux/fs.h>
  38 #include <linux/kernel.h>
  39 #include <linux/mm.h>
  40 #include <linux/bio.h>
  41 #include <linux/genhd.h>
  42 #include <linux/hdreg.h>
  43 #include <linux/errno.h>
  44 #include <linux/idr.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/init.h>
  47 #include <linux/blkdev.h>
  48 #include <linux/blkpg.h>
  49 #include <linux/blk-pm.h>
  50 #include <linux/delay.h>
  51 #include <linux/mutex.h>
  52 #include <linux/string_helpers.h>
  53 #include <linux/async.h>
  54 #include <linux/slab.h>
  55 #include <linux/sed-opal.h>
  56 #include <linux/pm_runtime.h>
  57 #include <linux/pr.h>
  58 #include <linux/t10-pi.h>
  59 #include <linux/uaccess.h>
  60 #include <asm/unaligned.h>
  61
  62 #include <scsi/scsi.h>
  63 #include <scsi/scsi_cmnd.h>
  64 #include <scsi/scsi_dbg.h>
  65 #include <scsi/scsi_device.h>
  66 #include <scsi/scsi_driver.h>
  67 #include <scsi/scsi_eh.h>
  68 #include <scsi/scsi_host.h>
  69 #include <scsi/scsi_ioctl.h>
  70 #include <scsi/scsicam.h>
  71
  72 #include "sd.h"
  73 #include "scsi_priv.h"
  74 #include "scsi_logging.h"
  75
  76 MODULE_AUTHOR("Eric Youngdale");
  77 MODULE_DESCRIPTION("SCSI disk (sd) driver");
  78 MODULE_LICENSE("GPL");
  79
  80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  95 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  96 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  97 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  98 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  99 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
 100
 101 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
 102 #define SD_MINORS       16
 103 #else
 104 #define SD_MINORS       0
 105 #endif
 106
 107 static void sd_config_discard(struct scsi_disk *, unsigned int);
 108 static void sd_config_write_same(struct scsi_disk *);
 109 static int  sd_revalidate_disk(struct gendisk *);
 110 static void sd_unlock_native_capacity(struct gendisk *disk);
 111 static int  sd_probe(struct device *);
 112 static int  sd_remove(struct device *);
 113 static void sd_shutdown(struct device *);
 114 static int sd_suspend_system(struct device *);
 115 static int sd_suspend_runtime(struct device *);
 116 static int sd_resume(struct device *);
 117 static void sd_rescan(struct device *);
 118 static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
 119 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 120 static int sd_done(struct scsi_cmnd *);
 121 static void sd_eh_reset(struct scsi_cmnd *);
 122 static int sd_eh_action(struct scsi_cmnd *, int);
 123 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 124 static void scsi_disk_release(struct device *cdev);
 125
 126 static DEFINE_IDA(sd_index_ida);
 127
 128 /* This semaphore is used to mediate the 0->1 reference get in the
 129  * face of object destruction (i.e. we can't allow a get on an
 130  * object after last put) */
 131 static DEFINE_MUTEX(sd_ref_mutex);
 132
 133 static struct kmem_cache *sd_cdb_cache;
 134 static mempool_t *sd_cdb_pool;
 135 static mempool_t *sd_page_pool;
 136
 137 static const char *sd_cache_types[] = {
 138         "write through", "none", "write back",
 139         "write back, no read (daft)"
 140 };
 141
 142 static void sd_set_flush_flag(struct scsi_disk *sdkp)
 143 {
 144         bool wc = false, fua = false;
 145
 146         if (sdkp->WCE) {
 147                 wc = true;
 148                 if (sdkp->DPOFUA)
 149                         fua = true;
 150         }
 151
 152         blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 153 }
 154
 155 static ssize_t
 156 cache_type_store(struct device *dev, struct device_attribute *attr,
 157                  const char *buf, size_t count)
 158 {
 159         int ct, rcd, wce, sp;
 160         struct scsi_disk *sdkp = to_scsi_disk(dev);
 161         struct scsi_device *sdp = sdkp->device;
 162         char buffer[64];
 163         char *buffer_data;
 164         struct scsi_mode_data data;
 165         struct scsi_sense_hdr sshdr;
 166         static const char temp[] = "temporary ";
 167         int len;
 168
 169         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 170                 /* no cache control on RBC devices; theoretically they
 171                  * can do it, but there's probably so many exceptions
 172                  * it's not worth the risk */
 173                 return -EINVAL;
 174
 175         if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 176                 buf += sizeof(temp) - 1;
 177                 sdkp->cache_override = 1;
 178         } else {
 179                 sdkp->cache_override = 0;
 180         }
 181
 182         ct = sysfs_match_string(sd_cache_types, buf);
 183         if (ct < 0)
 184                 return -EINVAL;
 185
 186         rcd = ct & 0x01 ? 1 : 0;
 187         wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 188
 189         if (sdkp->cache_override) {
 190                 sdkp->WCE = wce;
 191                 sdkp->RCD = rcd;
 192                 sd_set_flush_flag(sdkp);
 193                 return count;
 194         }
 195
 196         if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 197                             SD_MAX_RETRIES, &data, NULL))
 198                 return -EINVAL;
 199         len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 200                   data.block_descriptor_length);
 201         buffer_data = buffer + data.header_length +
 202                 data.block_descriptor_length;
 203         buffer_data[2] &= ~0x05;
 204         buffer_data[2] |= wce << 2 | rcd;
 205         sp = buffer_data[0] & 0x80 ? 1 : 0;
 206         buffer_data[0] &= ~0x80;
 207
 208         /*
 209          * Ensure WP, DPOFUA, and RESERVED fields are cleared in
 210          * received mode parameter buffer before doing MODE SELECT.
 211          */
 212         data.device_specific = 0;
 213
 214         if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 215                              SD_MAX_RETRIES, &data, &sshdr)) {
 216                 if (scsi_sense_valid(&sshdr))
 217                         sd_print_sense_hdr(sdkp, &sshdr);
 218                 return -EINVAL;
 219         }
 220         revalidate_disk(sdkp->disk);
 221         return count;
 222 }
 223
 224 static ssize_t
 225 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 226                        char *buf)
 227 {
 228         struct scsi_disk *sdkp = to_scsi_disk(dev);
 229         struct scsi_device *sdp = sdkp->device;
 230
 231         return sprintf(buf, "%u\n", sdp->manage_start_stop);
 232 }
 233
 234 static ssize_t
 235 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 236                         const char *buf, size_t count)
 237 {
 238         struct scsi_disk *sdkp = to_scsi_disk(dev);
 239         struct scsi_device *sdp = sdkp->device;
 240         bool v;
 241
 242         if (!capable(CAP_SYS_ADMIN))
 243                 return -EACCES;
 244
 245         if (kstrtobool(buf, &v))
 246                 return -EINVAL;
 247
 248         sdp->manage_start_stop = v;
 249
 250         return count;
 251 }
 252 static DEVICE_ATTR_RW(manage_start_stop);
 253
 254 static ssize_t
 255 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 256 {
 257         struct scsi_disk *sdkp = to_scsi_disk(dev);
 258
 259         return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 260 }
 261
 262 static ssize_t
 263 allow_restart_store(struct device *dev, struct device_attribute *attr,
 264                     const char *buf, size_t count)
 265 {
 266         bool v;
 267         struct scsi_disk *sdkp = to_scsi_disk(dev);
 268         struct scsi_device *sdp = sdkp->device;
 269
 270         if (!capable(CAP_SYS_ADMIN))
 271                 return -EACCES;
 272
 273         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 274                 return -EINVAL;
 275
 276         if (kstrtobool(buf, &v))
 277                 return -EINVAL;
 278
 279         sdp->allow_restart = v;
 280
 281         return count;
 282 }
 283 static DEVICE_ATTR_RW(allow_restart);
 284
 285 static ssize_t
 286 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 287 {
 288         struct scsi_disk *sdkp = to_scsi_disk(dev);
 289         int ct = sdkp->RCD + 2*sdkp->WCE;
 290
 291         return sprintf(buf, "%s\n", sd_cache_types[ct]);
 292 }
 293 static DEVICE_ATTR_RW(cache_type);
 294
 295 static ssize_t
 296 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 297 {
 298         struct scsi_disk *sdkp = to_scsi_disk(dev);
 299
 300         return sprintf(buf, "%u\n", sdkp->DPOFUA);
 301 }
 302 static DEVICE_ATTR_RO(FUA);
 303
 304 static ssize_t
 305 protection_type_show(struct device *dev, struct device_attribute *attr,
 306                      char *buf)
 307 {
 308         struct scsi_disk *sdkp = to_scsi_disk(dev);
 309
 310         return sprintf(buf, "%u\n", sdkp->protection_type);
 311 }
 312
 313 static ssize_t
 314 protection_type_store(struct device *dev, struct device_attribute *attr,
 315                       const char *buf, size_t count)
 316 {
 317         struct scsi_disk *sdkp = to_scsi_disk(dev);
 318         unsigned int val;
 319         int err;
 320
 321         if (!capable(CAP_SYS_ADMIN))
 322                 return -EACCES;
 323
 324         err = kstrtouint(buf, 10, &val);
 325
 326         if (err)
 327                 return err;
 328
 329         if (val <= T10_PI_TYPE3_PROTECTION)
 330                 sdkp->protection_type = val;
 331
 332         return count;
 333 }
 334 static DEVICE_ATTR_RW(protection_type);
 335
 336 static ssize_t
 337 protection_mode_show(struct device *dev, struct device_attribute *attr,
 338                      char *buf)
 339 {
 340         struct scsi_disk *sdkp = to_scsi_disk(dev);
 341         struct scsi_device *sdp = sdkp->device;
 342         unsigned int dif, dix;
 343
 344         dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 345         dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 346
 347         if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 348                 dif = 0;
 349                 dix = 1;
 350         }
 351
 352         if (!dif && !dix)
 353                 return sprintf(buf, "none\n");
 354
 355         return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 356 }
 357 static DEVICE_ATTR_RO(protection_mode);
 358
 359 static ssize_t
 360 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 361 {
 362         struct scsi_disk *sdkp = to_scsi_disk(dev);
 363
 364         return sprintf(buf, "%u\n", sdkp->ATO);
 365 }
 366 static DEVICE_ATTR_RO(app_tag_own);
 367
 368 static ssize_t
 369 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 370                        char *buf)
 371 {
 372         struct scsi_disk *sdkp = to_scsi_disk(dev);
 373
 374         return sprintf(buf, "%u\n", sdkp->lbpme);
 375 }
 376 static DEVICE_ATTR_RO(thin_provisioning);
 377
 378 /* sysfs_match_string() requires dense arrays */
 379 static const char *lbp_mode[] = {
 380         [SD_LBP_FULL]           = "full",
 381         [SD_LBP_UNMAP]          = "unmap",
 382         [SD_LBP_WS16]           = "writesame_16",
 383         [SD_LBP_WS10]           = "writesame_10",
 384         [SD_LBP_ZERO]           = "writesame_zero",
 385         [SD_LBP_DISABLE]        = "disabled",
 386 };
 387
 388 static ssize_t
 389 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 390                        char *buf)
 391 {
 392         struct scsi_disk *sdkp = to_scsi_disk(dev);
 393
 394         return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 395 }
 396
 397 static ssize_t
 398 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 399                         const char *buf, size_t count)
 400 {
 401         struct scsi_disk *sdkp = to_scsi_disk(dev);
 402         struct scsi_device *sdp = sdkp->device;
 403         int mode;
 404
 405         if (!capable(CAP_SYS_ADMIN))
 406                 return -EACCES;
 407
 408         if (sd_is_zoned(sdkp)) {
 409                 sd_config_discard(sdkp, SD_LBP_DISABLE);
 410                 return count;
 411         }
 412
 413         if (sdp->type != TYPE_DISK)
 414                 return -EINVAL;
 415
 416         mode = sysfs_match_string(lbp_mode, buf);
 417         if (mode < 0)
 418                 return -EINVAL;
 419
 420         sd_config_discard(sdkp, mode);
 421
 422         return count;
 423 }
 424 static DEVICE_ATTR_RW(provisioning_mode);
 425
 426 /* sysfs_match_string() requires dense arrays */
 427 static const char *zeroing_mode[] = {
 428         [SD_ZERO_WRITE]         = "write",
 429         [SD_ZERO_WS]            = "writesame",
 430         [SD_ZERO_WS16_UNMAP]    = "writesame_16_unmap",
 431         [SD_ZERO_WS10_UNMAP]    = "writesame_10_unmap",
 432 };
 433
 434 static ssize_t
 435 zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 436                   char *buf)
 437 {
 438         struct scsi_disk *sdkp = to_scsi_disk(dev);
 439
 440         return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 441 }
 442
 443 static ssize_t
 444 zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 445                    const char *buf, size_t count)
 446 {
 447         struct scsi_disk *sdkp = to_scsi_disk(dev);
 448         int mode;
 449
 450         if (!capable(CAP_SYS_ADMIN))
 451                 return -EACCES;
 452
 453         mode = sysfs_match_string(zeroing_mode, buf);
 454         if (mode < 0)
 455                 return -EINVAL;
 456
 457         sdkp->zeroing_mode = mode;
 458
 459         return count;
 460 }
 461 static DEVICE_ATTR_RW(zeroing_mode);
 462
 463 static ssize_t
 464 max_medium_access_timeouts_show(struct device *dev,
 465                                 struct device_attribute *attr, char *buf)
 466 {
 467         struct scsi_disk *sdkp = to_scsi_disk(dev);
 468
 469         return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 470 }
 471
 472 static ssize_t
 473 max_medium_access_timeouts_store(struct device *dev,
 474                                  struct device_attribute *attr, const char *buf,
 475                                  size_t count)
 476 {
 477         struct scsi_disk *sdkp = to_scsi_disk(dev);
 478         int err;
 479
 480         if (!capable(CAP_SYS_ADMIN))
 481                 return -EACCES;
 482
 483         err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 484
 485         return err ? err : count;
 486 }
 487 static DEVICE_ATTR_RW(max_medium_access_timeouts);
 488
 489 static ssize_t
 490 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 491                            char *buf)
 492 {
 493         struct scsi_disk *sdkp = to_scsi_disk(dev);
 494
 495         return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 496 }
 497
 498 static ssize_t
 499 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 500                             const char *buf, size_t count)
 501 {
 502         struct scsi_disk *sdkp = to_scsi_disk(dev);
 503         struct scsi_device *sdp = sdkp->device;
 504         unsigned long max;
 505         int err;
 506
 507         if (!capable(CAP_SYS_ADMIN))
 508                 return -EACCES;
 509
 510         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 511                 return -EINVAL;
 512
 513         err = kstrtoul(buf, 10, &max);
 514
 515         if (err)
 516                 return err;
 517
 518         if (max == 0)
 519                 sdp->no_write_same = 1;
 520         else if (max <= SD_MAX_WS16_BLOCKS) {
 521                 sdp->no_write_same = 0;
 522                 sdkp->max_ws_blocks = max;
 523         }
 524
 525         sd_config_write_same(sdkp);
 526
 527         return count;
 528 }
 529 static DEVICE_ATTR_RW(max_write_same_blocks);
 530
 531 static struct attribute *sd_disk_attrs[] = {
 532         &dev_attr_cache_type.attr,
 533         &dev_attr_FUA.attr,
 534         &dev_attr_allow_restart.attr,
 535         &dev_attr_manage_start_stop.attr,
 536         &dev_attr_protection_type.attr,
 537         &dev_attr_protection_mode.attr,
 538         &dev_attr_app_tag_own.attr,
 539         &dev_attr_thin_provisioning.attr,
 540         &dev_attr_provisioning_mode.attr,
 541         &dev_attr_zeroing_mode.attr,
 542         &dev_attr_max_write_same_blocks.attr,
 543         &dev_attr_max_medium_access_timeouts.attr,
 544         NULL,
 545 };
 546 ATTRIBUTE_GROUPS(sd_disk);
 547
 548 static struct class sd_disk_class = {
 549         .name           = "scsi_disk",
 550         .owner          = THIS_MODULE,
 551         .dev_release    = scsi_disk_release,
 552         .dev_groups     = sd_disk_groups,
 553 };
 554
 555 static const struct dev_pm_ops sd_pm_ops = {
 556         .suspend                = sd_suspend_system,
 557         .resume                 = sd_resume,
 558         .poweroff               = sd_suspend_system,
 559         .restore                = sd_resume,
 560         .runtime_suspend        = sd_suspend_runtime,
 561         .runtime_resume         = sd_resume,
 562 };
 563
 564 static struct scsi_driver sd_template = {
 565         .gendrv = {
 566                 .name           = "sd",
 567                 .owner          = THIS_MODULE,
 568                 .probe          = sd_probe,
 569                 .probe_type     = PROBE_PREFER_ASYNCHRONOUS,
 570                 .remove         = sd_remove,
 571                 .shutdown       = sd_shutdown,
 572                 .pm             = &sd_pm_ops,
 573         },
 574         .rescan                 = sd_rescan,
 575         .init_command           = sd_init_command,
 576         .uninit_command         = sd_uninit_command,
 577         .done                   = sd_done,
 578         .eh_action              = sd_eh_action,
 579         .eh_reset               = sd_eh_reset,
 580 };
 581
 582 /*
 583  * Dummy kobj_map->probe function.
 584  * The default ->probe function will call modprobe, which is
 585  * pointless as this module is already loaded.
 586  */
 587 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 588 {
 589         return NULL;
 590 }
 591
 592 /*
 593  * Device no to disk mapping:
 594  *
 595  *       major         disc2     disc  p1
 596  *   |............|.............|....|....| <- dev_t
 597  *    31        20 19          8 7  4 3  0
 598  *
 599  * Inside a major, we have 16k disks, however mapped non-
 600  * contiguously. The first 16 disks are for major0, the next
 601  * ones with major1, ... Disk 256 is for major0 again, disk 272
 602  * for major1, ...
 603  * As we stay compatible with our numbering scheme, we can reuse
 604  * the well-know SCSI majors 8, 65--71, 136--143.
 605  */
 606 static int sd_major(int major_idx)
 607 {
 608         switch (major_idx) {
 609         case 0:
 610                 return SCSI_DISK0_MAJOR;
 611         case 1 ... 7:
 612                 return SCSI_DISK1_MAJOR + major_idx - 1;
 613         case 8 ... 15:
 614                 return SCSI_DISK8_MAJOR + major_idx - 8;
 615         default:
 616                 BUG();
 617                 return 0;       /* shut up gcc */
 618         }
 619 }
 620
 621 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 622 {
 623         struct scsi_disk *sdkp = NULL;
 624
 625         mutex_lock(&sd_ref_mutex);
 626
 627         if (disk->private_data) {
 628                 sdkp = scsi_disk(disk);
 629                 if (scsi_device_get(sdkp->device) == 0)
 630                         get_device(&sdkp->dev);
 631                 else
 632                         sdkp = NULL;
 633         }
 634         mutex_unlock(&sd_ref_mutex);
 635         return sdkp;
 636 }
 637
 638 static void scsi_disk_put(struct scsi_disk *sdkp)
 639 {
 640         struct scsi_device *sdev = sdkp->device;
 641
 642         mutex_lock(&sd_ref_mutex);
 643         put_device(&sdkp->dev);
 644         scsi_device_put(sdev);
 645         mutex_unlock(&sd_ref_mutex);
 646 }
 647
 648 #ifdef CONFIG_BLK_SED_OPAL
 649 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
 650                 size_t len, bool send)
 651 {
 652         struct scsi_device *sdev = data;
 653         u8 cdb[12] = { 0, };
 654         int ret;
 655
 656         cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
 657         cdb[1] = secp;
 658         put_unaligned_be16(spsp, &cdb[2]);
 659         put_unaligned_be32(len, &cdb[6]);
 660
 661         ret = scsi_execute_req(sdev, cdb,
 662                         send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
 663                         buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
 664         return ret <= 0 ? ret : -EIO;
 665 }
 666 #endif /* CONFIG_BLK_SED_OPAL */
 667
 668 /*
 669  * Look up the DIX operation based on whether the command is read or
 670  * write and whether dix and dif are enabled.
 671  */
 672 static unsigned int sd_prot_op(bool write, bool dix, bool dif)
 673 {
 674         /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
 675         static const unsigned int ops[] = {     /* wrt dix dif */
 676                 SCSI_PROT_NORMAL,               /*  0   0   0  */
 677                 SCSI_PROT_READ_STRIP,           /*  0   0   1  */
 678                 SCSI_PROT_READ_INSERT,          /*  0   1   0  */
 679                 SCSI_PROT_READ_PASS,            /*  0   1   1  */
 680                 SCSI_PROT_NORMAL,               /*  1   0   0  */
 681                 SCSI_PROT_WRITE_INSERT,         /*  1   0   1  */
 682                 SCSI_PROT_WRITE_STRIP,          /*  1   1   0  */
 683                 SCSI_PROT_WRITE_PASS,           /*  1   1   1  */
 684         };
 685
 686         return ops[write << 2 | dix << 1 | dif];
 687 }
 688
 689 /*
 690  * Returns a mask of the protection flags that are valid for a given DIX
 691  * operation.
 692  */
 693 static unsigned int sd_prot_flag_mask(unsigned int prot_op)
 694 {
 695         static const unsigned int flag_mask[] = {
 696                 [SCSI_PROT_NORMAL]              = 0,
 697
 698                 [SCSI_PROT_READ_STRIP]          = SCSI_PROT_TRANSFER_PI |
 699                                                   SCSI_PROT_GUARD_CHECK |
 700                                                   SCSI_PROT_REF_CHECK |
 701                                                   SCSI_PROT_REF_INCREMENT,
 702
 703                 [SCSI_PROT_READ_INSERT]         = SCSI_PROT_REF_INCREMENT |
 704                                                   SCSI_PROT_IP_CHECKSUM,
 705
 706                 [SCSI_PROT_READ_PASS]           = SCSI_PROT_TRANSFER_PI |
 707                                                   SCSI_PROT_GUARD_CHECK |
 708                                                   SCSI_PROT_REF_CHECK |
 709                                                   SCSI_PROT_REF_INCREMENT |
 710                                                   SCSI_PROT_IP_CHECKSUM,
 711
 712                 [SCSI_PROT_WRITE_INSERT]        = SCSI_PROT_TRANSFER_PI |
 713                                                   SCSI_PROT_REF_INCREMENT,
 714
 715                 [SCSI_PROT_WRITE_STRIP]         = SCSI_PROT_GUARD_CHECK |
 716                                                   SCSI_PROT_REF_CHECK |
 717                                                   SCSI_PROT_REF_INCREMENT |
 718                                                   SCSI_PROT_IP_CHECKSUM,
 719
 720                 [SCSI_PROT_WRITE_PASS]          = SCSI_PROT_TRANSFER_PI |
 721                                                   SCSI_PROT_GUARD_CHECK |
 722                                                   SCSI_PROT_REF_CHECK |
 723                                                   SCSI_PROT_REF_INCREMENT |
 724                                                   SCSI_PROT_IP_CHECKSUM,
 725         };
 726
 727         return flag_mask[prot_op];
 728 }
 729
 730 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 731                                            unsigned int dix, unsigned int dif)
 732 {
 733         struct bio *bio = scmd->request->bio;
 734         unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 735         unsigned int protect = 0;
 736
 737         if (dix) {                              /* DIX Type 0, 1, 2, 3 */
 738                 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 739                         scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 740
 741                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 742                         scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 743         }
 744
 745         if (dif != T10_PI_TYPE3_PROTECTION) {   /* DIX/DIF Type 0, 1, 2 */
 746                 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 747
 748                 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 749                         scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 750         }
 751
 752         if (dif) {                              /* DIX/DIF Type 1, 2, 3 */
 753                 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 754
 755                 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 756                         protect = 3 << 5;       /* Disable target PI checking */
 757                 else
 758                         protect = 1 << 5;       /* Enable target PI checking */
 759         }
 760
 761         scsi_set_prot_op(scmd, prot_op);
 762         scsi_set_prot_type(scmd, dif);
 763         scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 764
 765         return protect;
 766 }
 767
 768 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 769 {
 770         struct request_queue *q = sdkp->disk->queue;
 771         unsigned int logical_block_size = sdkp->device->sector_size;
 772         unsigned int max_blocks = 0;
 773
 774         q->limits.discard_alignment =
 775                 sdkp->unmap_alignment * logical_block_size;
 776         q->limits.discard_granularity =
 777                 max(sdkp->physical_block_size,
 778                     sdkp->unmap_granularity * logical_block_size);
 779         sdkp->provisioning_mode = mode;
 780
 781         switch (mode) {
 782
 783         case SD_LBP_FULL:
 784         case SD_LBP_DISABLE:
 785                 blk_queue_max_discard_sectors(q, 0);
 786                 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 787                 return;
 788
 789         case SD_LBP_UNMAP:
 790                 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 791                                           (u32)SD_MAX_WS16_BLOCKS);
 792                 break;
 793
 794         case SD_LBP_WS16:
 795                 if (sdkp->device->unmap_limit_for_ws)
 796                         max_blocks = sdkp->max_unmap_blocks;
 797                 else
 798                         max_blocks = sdkp->max_ws_blocks;
 799
 800                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
 801                 break;
 802
 803         case SD_LBP_WS10:
 804                 if (sdkp->device->unmap_limit_for_ws)
 805                         max_blocks = sdkp->max_unmap_blocks;
 806                 else
 807                         max_blocks = sdkp->max_ws_blocks;
 808
 809                 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
 810                 break;
 811
 812         case SD_LBP_ZERO:
 813                 max_blocks = min_not_zero(sdkp->max_ws_blocks,
 814                                           (u32)SD_MAX_WS10_BLOCKS);
 815                 break;
 816         }
 817
 818         blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 819         blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 820 }
 821
 822 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 823 {
 824         struct scsi_device *sdp = cmd->device;
 825         struct request *rq = cmd->request;
 826         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 827         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 828         unsigned int data_len = 24;
 829         char *buf;
 830
 831         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 832         if (!rq->special_vec.bv_page)
 833                 return BLK_STS_RESOURCE;
 834         clear_highpage(rq->special_vec.bv_page);
 835         rq->special_vec.bv_offset = 0;
 836         rq->special_vec.bv_len = data_len;
 837         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 838
 839         cmd->cmd_len = 10;
 840         cmd->cmnd[0] = UNMAP;
 841         cmd->cmnd[8] = 24;
 842
 843         buf = page_address(rq->special_vec.bv_page);
 844         put_unaligned_be16(6 + 16, &buf[0]);
 845         put_unaligned_be16(16, &buf[2]);
 846         put_unaligned_be64(lba, &buf[8]);
 847         put_unaligned_be32(nr_blocks, &buf[16]);
 848
 849         cmd->allowed = SD_MAX_RETRIES;
 850         cmd->transfersize = data_len;
 851         rq->timeout = SD_TIMEOUT;
 852
 853         return scsi_init_io(cmd);
 854 }
 855
 856 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
 857                 bool unmap)
 858 {
 859         struct scsi_device *sdp = cmd->device;
 860         struct request *rq = cmd->request;
 861         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 862         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 863         u32 data_len = sdp->sector_size;
 864
 865         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 866         if (!rq->special_vec.bv_page)
 867                 return BLK_STS_RESOURCE;
 868         clear_highpage(rq->special_vec.bv_page);
 869         rq->special_vec.bv_offset = 0;
 870         rq->special_vec.bv_len = data_len;
 871         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 872
 873         cmd->cmd_len = 16;
 874         cmd->cmnd[0] = WRITE_SAME_16;
 875         if (unmap)
 876                 cmd->cmnd[1] = 0x8; /* UNMAP */
 877         put_unaligned_be64(lba, &cmd->cmnd[2]);
 878         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
 879
 880         cmd->allowed = SD_MAX_RETRIES;
 881         cmd->transfersize = data_len;
 882         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 883
 884         return scsi_init_io(cmd);
 885 }
 886
 887 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
 888                 bool unmap)
 889 {
 890         struct scsi_device *sdp = cmd->device;
 891         struct request *rq = cmd->request;
 892         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 893         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 894         u32 data_len = sdp->sector_size;
 895
 896         rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 897         if (!rq->special_vec.bv_page)
 898                 return BLK_STS_RESOURCE;
 899         clear_highpage(rq->special_vec.bv_page);
 900         rq->special_vec.bv_offset = 0;
 901         rq->special_vec.bv_len = data_len;
 902         rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 903
 904         cmd->cmd_len = 10;
 905         cmd->cmnd[0] = WRITE_SAME;
 906         if (unmap)
 907                 cmd->cmnd[1] = 0x8; /* UNMAP */
 908         put_unaligned_be32(lba, &cmd->cmnd[2]);
 909         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
 910
 911         cmd->allowed = SD_MAX_RETRIES;
 912         cmd->transfersize = data_len;
 913         rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 914
 915         return scsi_init_io(cmd);
 916 }
 917
 918 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 919 {
 920         struct request *rq = cmd->request;
 921         struct scsi_device *sdp = cmd->device;
 922         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 923         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 924         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 925
 926         if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 927                 switch (sdkp->zeroing_mode) {
 928                 case SD_ZERO_WS16_UNMAP:
 929                         return sd_setup_write_same16_cmnd(cmd, true);
 930                 case SD_ZERO_WS10_UNMAP:
 931                         return sd_setup_write_same10_cmnd(cmd, true);
 932                 }
 933         }
 934
 935         if (sdp->no_write_same)
 936                 return BLK_STS_TARGET;
 937
 938         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
 939                 return sd_setup_write_same16_cmnd(cmd, false);
 940
 941         return sd_setup_write_same10_cmnd(cmd, false);
 942 }
 943
 944 static void sd_config_write_same(struct scsi_disk *sdkp)
 945 {
 946         struct request_queue *q = sdkp->disk->queue;
 947         unsigned int logical_block_size = sdkp->device->sector_size;
 948
 949         if (sdkp->device->no_write_same) {
 950                 sdkp->max_ws_blocks = 0;
 951                 goto out;
 952         }
 953
 954         /* Some devices can not handle block counts above 0xffff despite
 955          * supporting WRITE SAME(16). Consequently we default to 64k
 956          * blocks per I/O unless the device explicitly advertises a
 957          * bigger limit.
 958          */
 959         if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 960                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 961                                                    (u32)SD_MAX_WS16_BLOCKS);
 962         else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 963                 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 964                                                    (u32)SD_MAX_WS10_BLOCKS);
 965         else {
 966                 sdkp->device->no_write_same = 1;
 967                 sdkp->max_ws_blocks = 0;
 968         }
 969
 970         if (sdkp->lbprz && sdkp->lbpws)
 971                 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 972         else if (sdkp->lbprz && sdkp->lbpws10)
 973                 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 974         else if (sdkp->max_ws_blocks)
 975                 sdkp->zeroing_mode = SD_ZERO_WS;
 976         else
 977                 sdkp->zeroing_mode = SD_ZERO_WRITE;
 978
 979         if (sdkp->max_ws_blocks &&
 980             sdkp->physical_block_size > logical_block_size) {
 981                 /*
 982                  * Reporting a maximum number of blocks that is not aligned
 983                  * on the device physical size would cause a large write same
 984                  * request to be split into physically unaligned chunks by
 985                  * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
 986                  * even if the caller of these functions took care to align the
 987                  * large request. So make sure the maximum reported is aligned
 988                  * to the device physical block size. This is only an optional
 989                  * optimization for regular disks, but this is mandatory to
 990                  * avoid failure of large write same requests directed at
 991                  * sequential write required zones of host-managed ZBC disks.
 992                  */
 993                 sdkp->max_ws_blocks =
 994                         round_down(sdkp->max_ws_blocks,
 995                                    bytes_to_logical(sdkp->device,
 996                                                     sdkp->physical_block_size));
 997         }
 998
 999 out:
1000         blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
1001                                          (logical_block_size >> 9));
1002         blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
1003                                          (logical_block_size >> 9));
1004 }
1005
1006 /**
1007  * sd_setup_write_same_cmnd - write the same data to multiple blocks
1008  * @cmd: command to prepare
1009  *
1010  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
1011  * the preference indicated by the target device.
1012  **/
1013 static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
1014 {
1015         struct request *rq = cmd->request;
1016         struct scsi_device *sdp = cmd->device;
1017         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1018         struct bio *bio = rq->bio;
1019         u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1020         u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1021         blk_status_t ret;
1022
1023         if (sdkp->device->no_write_same)
1024                 return BLK_STS_TARGET;
1025
1026         BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
1027
1028         rq->timeout = SD_WRITE_SAME_TIMEOUT;
1029
1030         if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) {
1031                 cmd->cmd_len = 16;
1032                 cmd->cmnd[0] = WRITE_SAME_16;
1033                 put_unaligned_be64(lba, &cmd->cmnd[2]);
1034                 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1035         } else {
1036                 cmd->cmd_len = 10;
1037                 cmd->cmnd[0] = WRITE_SAME;
1038                 put_unaligned_be32(lba, &cmd->cmnd[2]);
1039                 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1040         }
1041
1042         cmd->transfersize = sdp->sector_size;
1043         cmd->allowed = SD_MAX_RETRIES;
1044
1045         /*
1046          * For WRITE SAME the data transferred via the DATA OUT buffer is
1047          * different from the amount of data actually written to the target.
1048          *
1049          * We set up __data_len to the amount of data transferred via the
1050          * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
1051          * to transfer a single sector of data first, but then reset it to
1052          * the amount of data to be written right after so that the I/O path
1053          * knows how much to actually write.
1054          */
1055         rq->__data_len = sdp->sector_size;
1056         ret = scsi_init_io(cmd);
1057         rq->__data_len = blk_rq_bytes(rq);
1058
1059         return ret;
1060 }
1061
1062 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1063 {
1064         struct request *rq = cmd->request;
1065
1066         /* flush requests don't perform I/O, zero the S/G table */
1067         memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1068
1069         cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1070         cmd->cmd_len = 10;
1071         cmd->transfersize = 0;
1072         cmd->allowed = SD_MAX_RETRIES;
1073
1074         rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1075         return BLK_STS_OK;
1076 }
1077
1078 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1079                                        sector_t lba, unsigned int nr_blocks,
1080                                        unsigned char flags)
1081 {
1082         cmd->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1083         if (unlikely(cmd->cmnd == NULL))
1084                 return BLK_STS_RESOURCE;
1085
1086         cmd->cmd_len = SD_EXT_CDB_SIZE;
1087         memset(cmd->cmnd, 0, cmd->cmd_len);
1088
1089         cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
1090         cmd->cmnd[7]  = 0x18; /* Additional CDB len */
1091         cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
1092         cmd->cmnd[10] = flags;
1093         put_unaligned_be64(lba, &cmd->cmnd[12]);
1094         put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
1095         put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
1096
1097         return BLK_STS_OK;
1098 }
1099
1100 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1101                                        sector_t lba, unsigned int nr_blocks,
1102                                        unsigned char flags)
1103 {
1104         cmd->cmd_len  = 16;
1105         cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
1106         cmd->cmnd[1]  = flags;
1107         cmd->cmnd[14] = 0;
1108         cmd->cmnd[15] = 0;
1109         put_unaligned_be64(lba, &cmd->cmnd[2]);
1110         put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1111
1112         return BLK_STS_OK;
1113 }
1114
1115 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1116                                        sector_t lba, unsigned int nr_blocks,
1117                                        unsigned char flags)
1118 {
1119         cmd->cmd_len = 10;
1120         cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1121         cmd->cmnd[1] = flags;
1122         cmd->cmnd[6] = 0;
1123         cmd->cmnd[9] = 0;
1124         put_unaligned_be32(lba, &cmd->cmnd[2]);
1125         put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1126
1127         return BLK_STS_OK;
1128 }
1129
1130 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1131                                       sector_t lba, unsigned int nr_blocks,
1132                                       unsigned char flags)
1133 {
1134         /* Avoid that 0 blocks gets translated into 256 blocks. */
1135         if (WARN_ON_ONCE(nr_blocks == 0))
1136                 return BLK_STS_IOERR;
1137
1138         if (unlikely(flags & 0x8)) {
1139                 /*
1140                  * This happens only if this drive failed 10byte rw
1141                  * command with ILLEGAL_REQUEST during operation and
1142                  * thus turned off use_10_for_rw.
1143                  */
1144                 scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1145                 return BLK_STS_IOERR;
1146         }
1147
1148         cmd->cmd_len = 6;
1149         cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1150         cmd->cmnd[1] = (lba >> 16) & 0x1f;
1151         cmd->cmnd[2] = (lba >> 8) & 0xff;
1152         cmd->cmnd[3] = lba & 0xff;
1153         cmd->cmnd[4] = nr_blocks;
1154         cmd->cmnd[5] = 0;
1155
1156         return BLK_STS_OK;
1157 }
1158
1159 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1160 {
1161         struct request *rq = cmd->request;
1162         struct scsi_device *sdp = cmd->device;
1163         struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1164         sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1165         sector_t threshold;
1166         unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1167         unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1168         bool write = rq_data_dir(rq) == WRITE;
1169         unsigned char protect, fua;
1170         blk_status_t ret;
1171         unsigned int dif;
1172         bool dix;
1173
1174         ret = scsi_init_io(cmd);
1175         if (ret != BLK_STS_OK)
1176                 return ret;
1177
1178         if (!scsi_device_online(sdp) || sdp->changed) {
1179                 scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1180                 return BLK_STS_IOERR;
1181         }
1182
1183         if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->rq_disk)) {
1184                 scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1185                 return BLK_STS_IOERR;
1186         }
1187
1188         if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1189                 scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1190                 return BLK_STS_IOERR;
1191         }
1192
1193         /*
1194          * Some SD card readers can't handle accesses which touch the
1195          * last one or two logical blocks. Split accesses as needed.
1196          */
1197         threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1198
1199         if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1200                 if (lba < threshold) {
1201                         /* Access up to the threshold but not beyond */
1202                         nr_blocks = threshold - lba;
1203                 } else {
1204                         /* Access only a single logical block */
1205                         nr_blocks = 1;
1206                 }
1207         }
1208
1209         fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1210         dix = scsi_prot_sg_count(cmd);
1211         dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
1212
1213         if (dif || dix)
1214                 protect = sd_setup_protect_cmnd(cmd, dix, dif);
1215         else
1216                 protect = 0;
1217
1218         if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1219                 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1220                                          protect | fua);
1221         } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1222                 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1223                                          protect | fua);
1224         } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1225                    sdp->use_10_for_rw || protect) {
1226                 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1227                                          protect | fua);
1228         } else {
1229                 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1230                                         protect | fua);
1231         }
1232
1233         if (unlikely(ret != BLK_STS_OK))
1234                 return ret;
1235
1236         /*
1237          * We shouldn't disconnect in the middle of a sector, so with a dumb
1238          * host adapter, it's safe to assume that we can at least transfer
1239          * this many bytes between each connect / disconnect.
1240          */
1241         cmd->transfersize = sdp->sector_size;
1242         cmd->underflow = nr_blocks << 9;
1243         cmd->allowed = SD_MAX_RETRIES;
1244         cmd->sdb.length = nr_blocks * sdp->sector_size;
1245
1246         SCSI_LOG_HLQUEUE(1,
1247                          scmd_printk(KERN_INFO, cmd,
1248                                      "%s: block=%llu, count=%d\n", __func__,
1249                                      (unsigned long long)blk_rq_pos(rq),
1250                                      blk_rq_sectors(rq)));
1251         SCSI_LOG_HLQUEUE(2,
1252                          scmd_printk(KERN_INFO, cmd,
1253                                      "%s %d/%u 512 byte blocks.\n",
1254                                      write ? "writing" : "reading", nr_blocks,
1255                                      blk_rq_sectors(rq)));
1256
1257         /*
1258          * This indicates that the command is ready from our end to be
1259          * queued.
1260          */
1261         return BLK_STS_OK;
1262 }
1263
1264 static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1265 {
1266         struct request *rq = cmd->request;
1267
1268         switch (req_op(rq)) {
1269         case REQ_OP_DISCARD:
1270                 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1271                 case SD_LBP_UNMAP:
1272                         return sd_setup_unmap_cmnd(cmd);
1273                 case SD_LBP_WS16:
1274                         return sd_setup_write_same16_cmnd(cmd, true);
1275                 case SD_LBP_WS10:
1276                         return sd_setup_write_same10_cmnd(cmd, true);
1277                 case SD_LBP_ZERO:
1278                         return sd_setup_write_same10_cmnd(cmd, false);
1279                 default:
1280                         return BLK_STS_TARGET;
1281                 }
1282         case REQ_OP_WRITE_ZEROES:
1283                 return sd_setup_write_zeroes_cmnd(cmd);
1284         case REQ_OP_WRITE_SAME:
1285                 return sd_setup_write_same_cmnd(cmd);
1286         case REQ_OP_FLUSH:
1287                 return sd_setup_flush_cmnd(cmd);
1288         case REQ_OP_READ:
1289         case REQ_OP_WRITE:
1290                 return sd_setup_read_write_cmnd(cmd);
1291         case REQ_OP_ZONE_RESET:
1292                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1293                                                    false);
1294         case REQ_OP_ZONE_RESET_ALL:
1295                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1296                                                    true);
1297         case REQ_OP_ZONE_OPEN:
1298                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false);
1299         case REQ_OP_ZONE_CLOSE:
1300                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false);
1301         case REQ_OP_ZONE_FINISH:
1302                 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false);
1303         default:
1304                 WARN_ON_ONCE(1);
1305                 return BLK_STS_NOTSUPP;
1306         }
1307 }
1308
1309 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1310 {
1311         struct request *rq = SCpnt->request;
1312         u8 *cmnd;
1313
1314         if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1315                 mempool_free(rq->special_vec.bv_page, sd_page_pool);
1316
1317         if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1318                 cmnd = SCpnt->cmnd;
1319                 SCpnt->cmnd = NULL;
1320                 SCpnt->cmd_len = 0;
1321                 mempool_free(cmnd, sd_cdb_pool);
1322         }
1323 }
1324
1325 /**
1326  *      sd_open - open a scsi disk device
1327  *      @bdev: Block device of the scsi disk to open
1328  *      @mode: FMODE_* mask
1329  *
1330  *      Returns 0 if successful. Returns a negated errno value in case
1331  *      of error.
1332  *
1333  *      Note: This can be called from a user context (e.g. fsck(1) )
1334  *      or from within the kernel (e.g. as a result of a mount(1) ).
1335  *      In the latter case @inode and @filp carry an abridged amount
1336  *      of information as noted above.
1337  *
1338  *      Locking: called with bdev->bd_mutex held.
1339  **/
1340 static int sd_open(struct block_device *bdev, fmode_t mode)
1341 {
1342         struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1343         struct scsi_device *sdev;
1344         int retval;
1345
1346         if (!sdkp)
1347                 return -ENXIO;
1348
1349         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1350
1351         sdev = sdkp->device;
1352
1353         /*
1354          * If the device is in error recovery, wait until it is done.
1355          * If the device is offline, then disallow any access to it.
1356          */
1357         retval = -ENXIO;
1358         if (!scsi_block_when_processing_errors(sdev))
1359                 goto error_out;
1360
1361         if (sdev->removable || sdkp->write_prot)
1362                 check_disk_change(bdev);
1363
1364         /*
1365          * If the drive is empty, just let the open fail.
1366          */
1367         retval = -ENOMEDIUM;
1368         if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1369                 goto error_out;
1370
1371         /*
1372          * If the device has the write protect tab set, have the open fail
1373          * if the user expects to be able to write to the thing.
1374          */
1375         retval = -EROFS;
1376         if (sdkp->write_prot && (mode & FMODE_WRITE))
1377                 goto error_out;
1378
1379         /*
1380          * It is possible that the disk changing stuff resulted in
1381          * the device being taken offline.  If this is the case,
1382          * report this to the user, and don't pretend that the
1383          * open actually succeeded.
1384          */
1385         retval = -ENXIO;
1386         if (!scsi_device_online(sdev))
1387                 goto error_out;
1388
1389         if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1390                 if (scsi_block_when_processing_errors(sdev))
1391                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1392         }
1393
1394         return 0;
1395
1396 error_out:
1397         scsi_disk_put(sdkp);
1398         return retval;
1399 }
1400
1401 /**
1402  *      sd_release - invoked when the (last) close(2) is called on this
1403  *      scsi disk.
1404  *      @disk: disk to release
1405  *      @mode: FMODE_* mask
1406  *
1407  *      Returns 0.
1408  *
1409  *      Note: may block (uninterruptible) if error recovery is underway
1410  *      on this disk.
1411  *
1412  *      Locking: called with bdev->bd_mutex held.
1413  **/
1414 static void sd_release(struct gendisk *disk, fmode_t mode)
1415 {
1416         struct scsi_disk *sdkp = scsi_disk(disk);
1417         struct scsi_device *sdev = sdkp->device;
1418
1419         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1420
1421         if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1422                 if (scsi_block_when_processing_errors(sdev))
1423                         scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1424         }
1425
1426         scsi_disk_put(sdkp);
1427 }
1428
1429 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1430 {
1431         struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1432         struct scsi_device *sdp = sdkp->device;
1433         struct Scsi_Host *host = sdp->host;
1434         sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1435         int diskinfo[4];
1436
1437         /* default to most commonly used values */
1438         diskinfo[0] = 0x40;     /* 1 << 6 */
1439         diskinfo[1] = 0x20;     /* 1 << 5 */
1440         diskinfo[2] = capacity >> 11;
1441
1442         /* override with calculated, extended default, or driver values */
1443         if (host->hostt->bios_param)
1444                 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1445         else
1446                 scsicam_bios_param(bdev, capacity, diskinfo);
1447
1448         geo->heads = diskinfo[0];
1449         geo->sectors = diskinfo[1];
1450         geo->cylinders = diskinfo[2];
1451         return 0;
1452 }
1453
1454 /**
1455  *      sd_ioctl - process an ioctl
1456  *      @bdev: target block device
1457  *      @mode: FMODE_* mask
1458  *      @cmd: ioctl command number
1459  *      @arg: this is third argument given to ioctl(2) system call.
1460  *      Often contains a pointer.
1461  *
1462  *      Returns 0 if successful (some ioctls return positive numbers on
1463  *      success as well). Returns a negated errno value in case of error.
1464  *
1465  *      Note: most ioctls are forward onto the block subsystem or further
1466  *      down in the scsi subsystem.
1467  **/
1468 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1469                     unsigned int cmd, unsigned long arg)
1470 {
1471         struct gendisk *disk = bdev->bd_disk;
1472         struct scsi_disk *sdkp = scsi_disk(disk);
1473         struct scsi_device *sdp = sdkp->device;
1474         void __user *p = (void __user *)arg;
1475         int error;
1476
1477         SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1478                                     "cmd=0x%x\n", disk->disk_name, cmd));
1479
1480         error = scsi_verify_blk_ioctl(bdev, cmd);
1481         if (error < 0)
1482                 return error;
1483
1484         /*
1485          * If we are in the middle of error recovery, don't let anyone
1486          * else try and use this device.  Also, if error recovery fails, it
1487          * may try and take the device offline, in which case all further
1488          * access to the device is prohibited.
1489          */
1490         error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1491                         (mode & FMODE_NDELAY) != 0);
1492         if (error)
1493                 goto out;
1494
1495         if (is_sed_ioctl(cmd))
1496                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1497
1498         /*
1499          * Send SCSI addressing ioctls directly to mid level, send other
1500          * ioctls to block level and then onto mid level if they can't be
1501          * resolved.
1502          */
1503         switch (cmd) {
1504                 case SCSI_IOCTL_GET_IDLUN:
1505                 case SCSI_IOCTL_GET_BUS_NUMBER:
1506                         error = scsi_ioctl(sdp, cmd, p);
1507                         break;
1508                 default:
1509                         error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1510                         if (error != -ENOTTY)
1511                                 break;
1512                         error = scsi_ioctl(sdp, cmd, p);
1513                         break;
1514         }
1515 out:
1516         return error;
1517 }
1518
1519 static void set_media_not_present(struct scsi_disk *sdkp)
1520 {
1521         if (sdkp->media_present)
1522                 sdkp->device->changed = 1;
1523
1524         if (sdkp->device->removable) {
1525                 sdkp->media_present = 0;
1526                 sdkp->capacity = 0;
1527         }
1528 }
1529
1530 static int media_not_present(struct scsi_disk *sdkp,
1531                              struct scsi_sense_hdr *sshdr)
1532 {
1533         if (!scsi_sense_valid(sshdr))
1534                 return 0;
1535
1536         /* not invoked for commands that could return deferred errors */
1537         switch (sshdr->sense_key) {
1538         case UNIT_ATTENTION:
1539         case NOT_READY:
1540                 /* medium not present */
1541                 if (sshdr->asc == 0x3A) {
1542                         set_media_not_present(sdkp);
1543                         return 1;
1544                 }
1545         }
1546         return 0;
1547 }
1548
1549 /**
1550  *      sd_check_events - check media events
1551  *      @disk: kernel device descriptor
1552  *      @clearing: disk events currently being cleared
1553  *
1554  *      Returns mask of DISK_EVENT_*.
1555  *
1556  *      Note: this function is invoked from the block subsystem.
1557  **/
1558 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1559 {
1560         struct scsi_disk *sdkp = scsi_disk_get(disk);
1561         struct scsi_device *sdp;
1562         int retval;
1563
1564         if (!sdkp)
1565                 return 0;
1566
1567         sdp = sdkp->device;
1568         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1569
1570         /*
1571          * If the device is offline, don't send any commands - just pretend as
1572          * if the command failed.  If the device ever comes back online, we
1573          * can deal with it then.  It is only because of unrecoverable errors
1574          * that we would ever take a device offline in the first place.
1575          */
1576         if (!scsi_device_online(sdp)) {
1577                 set_media_not_present(sdkp);
1578                 goto out;
1579         }
1580
1581         /*
1582          * Using TEST_UNIT_READY enables differentiation between drive with
1583          * no cartridge loaded - NOT READY, drive with changed cartridge -
1584          * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1585          *
1586          * Drives that auto spin down. eg iomega jaz 1G, will be started
1587          * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1588          * sd_revalidate() is called.
1589          */
1590         if (scsi_block_when_processing_errors(sdp)) {
1591                 struct scsi_sense_hdr sshdr = { 0, };
1592
1593                 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1594                                               &sshdr);
1595
1596                 /* failed to execute TUR, assume media not present */
1597                 if (host_byte(retval)) {
1598                         set_media_not_present(sdkp);
1599                         goto out;
1600                 }
1601
1602                 if (media_not_present(sdkp, &sshdr))
1603                         goto out;
1604         }
1605
1606         /*
1607          * For removable scsi disk we have to recognise the presence
1608          * of a disk in the drive.
1609          */
1610         if (!sdkp->media_present)
1611                 sdp->changed = 1;
1612         sdkp->media_present = 1;
1613 out:
1614         /*
1615          * sdp->changed is set under the following conditions:
1616          *
1617          *      Medium present state has changed in either direction.
1618          *      Device has indicated UNIT_ATTENTION.
1619          */
1620         retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1621         sdp->changed = 0;
1622         scsi_disk_put(sdkp);
1623         return retval;
1624 }
1625
1626 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1627 {
1628         int retries, res;
1629         struct scsi_device *sdp = sdkp->device;
1630         const int timeout = sdp->request_queue->rq_timeout
1631                 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1632         struct scsi_sense_hdr my_sshdr;
1633
1634         if (!scsi_device_online(sdp))
1635                 return -ENODEV;
1636
1637         /* caller might not be interested in sense, but we need it */
1638         if (!sshdr)
1639                 sshdr = &my_sshdr;
1640
1641         for (retries = 3; retries > 0; --retries) {
1642                 unsigned char cmd[10] = { 0 };
1643
1644                 cmd[0] = SYNCHRONIZE_CACHE;
1645                 /*
1646                  * Leave the rest of the command zero to indicate
1647                  * flush everything.
1648                  */
1649                 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1650                                 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1651                 if (res == 0)
1652                         break;
1653         }
1654
1655         if (res) {
1656                 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1657
1658                 if (driver_byte(res) == DRIVER_SENSE)
1659                         sd_print_sense_hdr(sdkp, sshdr);
1660
1661                 /* we need to evaluate the error return  */
1662                 if (scsi_sense_valid(sshdr) &&
1663                         (sshdr->asc == 0x3a ||  /* medium not present */
1664                          sshdr->asc == 0x20 ||  /* invalid command */
1665                          (sshdr->asc == 0x74 && sshdr->ascq == 0x71)))  /* drive is password locked */
1666                                 /* this is no error here */
1667                                 return 0;
1668
1669                 switch (host_byte(res)) {
1670                 /* ignore errors due to racing a disconnection */
1671                 case DID_BAD_TARGET:
1672                 case DID_NO_CONNECT:
1673                         return 0;
1674                 /* signal the upper layer it might try again */
1675                 case DID_BUS_BUSY:
1676                 case DID_IMM_RETRY:
1677                 case DID_REQUEUE:
1678                 case DID_SOFT_ERROR:
1679                         return -EBUSY;
1680                 default:
1681                         return -EIO;
1682                 }
1683         }
1684         return 0;
1685 }
1686
1687 static void sd_rescan(struct device *dev)
1688 {
1689         struct scsi_disk *sdkp = dev_get_drvdata(dev);
1690
1691         revalidate_disk(sdkp->disk);
1692 }
1693
1694
1695 #ifdef CONFIG_COMPAT
1696 /*
1697  * This gets directly called from VFS. When the ioctl
1698  * is not recognized we go back to the other translation paths.
1699  */
1700 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1701                            unsigned int cmd, unsigned long arg)
1702 {
1703         struct gendisk *disk = bdev->bd_disk;
1704         struct scsi_disk *sdkp = scsi_disk(disk);
1705         struct scsi_device *sdev = sdkp->device;
1706         void __user *p = compat_ptr(arg);
1707         int error;
1708
1709         error = scsi_verify_blk_ioctl(bdev, cmd);
1710         if (error < 0)
1711                 return error;
1712
1713         error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1714                         (mode & FMODE_NDELAY) != 0);
1715         if (error)
1716                 return error;
1717
1718         if (is_sed_ioctl(cmd))
1719                 return sed_ioctl(sdkp->opal_dev, cmd, p);
1720
1721         /*
1722          * Let the static ioctl translation table take care of it.
1723          */
1724         if (!sdev->host->hostt->compat_ioctl)
1725                 return -ENOIOCTLCMD;
1726         return sdev->host->hostt->compat_ioctl(sdev, cmd, p);
1727 }
1728 #endif
1729
1730 static char sd_pr_type(enum pr_type type)
1731 {
1732         switch (type) {
1733         case PR_WRITE_EXCLUSIVE:
1734                 return 0x01;
1735         case PR_EXCLUSIVE_ACCESS:
1736                 return 0x03;
1737         case PR_WRITE_EXCLUSIVE_REG_ONLY:
1738                 return 0x05;
1739         case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1740                 return 0x06;
1741         case PR_WRITE_EXCLUSIVE_ALL_REGS:
1742                 return 0x07;
1743         case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1744                 return 0x08;
1745         default:
1746                 return 0;
1747         }
1748 };
1749
1750 static int sd_pr_command(struct block_device *bdev, u8 sa,
1751                 u64 key, u64 sa_key, u8 type, u8 flags)
1752 {
1753         struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1754         struct scsi_sense_hdr sshdr;
1755         int result;
1756         u8 cmd[16] = { 0, };
1757         u8 data[24] = { 0, };
1758
1759         cmd[0] = PERSISTENT_RESERVE_OUT;
1760         cmd[1] = sa;
1761         cmd[2] = type;
1762         put_unaligned_be32(sizeof(data), &cmd[5]);
1763
1764         put_unaligned_be64(key, &data[0]);
1765         put_unaligned_be64(sa_key, &data[8]);
1766         data[20] = flags;
1767
1768         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1769                         &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1770
1771         if (driver_byte(result) == DRIVER_SENSE &&
1772             scsi_sense_valid(&sshdr)) {
1773                 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1774                 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1775         }
1776
1777         return result;
1778 }
1779
1780 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1781                 u32 flags)
1782 {
1783         if (flags & ~PR_FL_IGNORE_KEY)
1784                 return -EOPNOTSUPP;
1785         return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1786                         old_key, new_key, 0,
1787                         (1 << 0) /* APTPL */);
1788 }
1789
1790 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1791                 u32 flags)
1792 {
1793         if (flags)
1794                 return -EOPNOTSUPP;
1795         return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1796 }
1797
1798 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1799 {
1800         return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1801 }
1802
1803 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1804                 enum pr_type type, bool abort)
1805 {
1806         return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1807                              sd_pr_type(type), 0);
1808 }
1809
1810 static int sd_pr_clear(struct block_device *bdev, u64 key)
1811 {
1812         return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1813 }
1814
1815 static const struct pr_ops sd_pr_ops = {
1816         .pr_register    = sd_pr_register,
1817         .pr_reserve     = sd_pr_reserve,
1818         .pr_release     = sd_pr_release,
1819         .pr_preempt     = sd_pr_preempt,
1820         .pr_clear       = sd_pr_clear,
1821 };
1822
1823 static const struct block_device_operations sd_fops = {
1824         .owner                  = THIS_MODULE,
1825         .open                   = sd_open,
1826         .release                = sd_release,
1827         .ioctl                  = sd_ioctl,
1828         .getgeo                 = sd_getgeo,
1829 #ifdef CONFIG_COMPAT
1830         .compat_ioctl           = sd_compat_ioctl,
1831 #endif
1832         .check_events           = sd_check_events,
1833         .revalidate_disk        = sd_revalidate_disk,
1834         .unlock_native_capacity = sd_unlock_native_capacity,
1835         .report_zones           = sd_zbc_report_zones,
1836         .pr_ops                 = &sd_pr_ops,
1837 };
1838
1839 /**
1840  *      sd_eh_reset - reset error handling callback
1841  *      @scmd:          sd-issued command that has failed
1842  *
1843  *      This function is called by the SCSI midlayer before starting
1844  *      SCSI EH. When counting medium access failures we have to be
1845  *      careful to register it only only once per device and SCSI EH run;
1846  *      there might be several timed out commands which will cause the
1847  *      'max_medium_access_timeouts' counter to trigger after the first
1848  *      SCSI EH run already and set the device to offline.
1849  *      So this function resets the internal counter before starting SCSI EH.
1850  **/
1851 static void sd_eh_reset(struct scsi_cmnd *scmd)
1852 {
1853         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1854
1855         /* New SCSI EH run, reset gate variable */
1856         sdkp->ignore_medium_access_errors = false;
1857 }
1858
1859 /**
1860  *      sd_eh_action - error handling callback
1861  *      @scmd:          sd-issued command that has failed
1862  *      @eh_disp:       The recovery disposition suggested by the midlayer
1863  *
1864  *      This function is called by the SCSI midlayer upon completion of an
1865  *      error test command (currently TEST UNIT READY). The result of sending
1866  *      the eh command is passed in eh_disp.  We're looking for devices that
1867  *      fail medium access commands but are OK with non access commands like
1868  *      test unit ready (so wrongly see the device as having a successful
1869  *      recovery)
1870  **/
1871 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1872 {
1873         struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1874         struct scsi_device *sdev = scmd->device;
1875
1876         if (!scsi_device_online(sdev) ||
1877             !scsi_medium_access_command(scmd) ||
1878             host_byte(scmd->result) != DID_TIME_OUT ||
1879             eh_disp != SUCCESS)
1880                 return eh_disp;
1881
1882         /*
1883          * The device has timed out executing a medium access command.
1884          * However, the TEST UNIT READY command sent during error
1885          * handling completed successfully. Either the device is in the
1886          * process of recovering or has it suffered an internal failure
1887          * that prevents access to the storage medium.
1888          */
1889         if (!sdkp->ignore_medium_access_errors) {
1890                 sdkp->medium_access_timed_out++;
1891                 sdkp->ignore_medium_access_errors = true;
1892         }
1893
1894         /*
1895          * If the device keeps failing read/write commands but TEST UNIT
1896          * READY always completes successfully we assume that medium
1897          * access is no longer possible and take the device offline.
1898          */
1899         if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1900                 scmd_printk(KERN_ERR, scmd,
1901                             "Medium access timeout failure. Offlining disk!\n");
1902                 mutex_lock(&sdev->state_mutex);
1903                 scsi_device_set_state(sdev, SDEV_OFFLINE);
1904                 mutex_unlock(&sdev->state_mutex);
1905
1906                 return SUCCESS;
1907         }
1908
1909         return eh_disp;
1910 }
1911
1912 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1913 {
1914         struct request *req = scmd->request;
1915         struct scsi_device *sdev = scmd->device;
1916         unsigned int transferred, good_bytes;
1917         u64 start_lba, end_lba, bad_lba;
1918
1919         /*
1920          * Some commands have a payload smaller than the device logical
1921          * block size (e.g. INQUIRY on a 4K disk).
1922          */
1923         if (scsi_bufflen(scmd) <= sdev->sector_size)
1924                 return 0;
1925
1926         /* Check if we have a 'bad_lba' information */
1927         if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1928                                      SCSI_SENSE_BUFFERSIZE,
1929                                      &bad_lba))
1930                 return 0;
1931
1932         /*
1933          * If the bad lba was reported incorrectly, we have no idea where
1934          * the error is.
1935          */
1936         start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1937         end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1938         if (bad_lba < start_lba || bad_lba >= end_lba)
1939                 return 0;
1940
1941         /*
1942          * resid is optional but mostly filled in.  When it's unused,
1943          * its value is zero, so we assume the whole buffer transferred
1944          */
1945         transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1946
1947         /* This computation should always be done in terms of the
1948          * resolution of the device's medium.
1949          */
1950         good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1951
1952         return min(good_bytes, transferred);
1953 }
1954
1955 /**
1956  *      sd_done - bottom half handler: called when the lower level
1957  *      driver has completed (successfully or otherwise) a scsi command.
1958  *      @SCpnt: mid-level's per command structure.
1959  *
1960  *      Note: potentially run from within an ISR. Must not block.
1961  **/
1962 static int sd_done(struct scsi_cmnd *SCpnt)
1963 {
1964         int result = SCpnt->result;
1965         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1966         unsigned int sector_size = SCpnt->device->sector_size;
1967         unsigned int resid;
1968         struct scsi_sense_hdr sshdr;
1969         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1970         struct request *req = SCpnt->request;
1971         int sense_valid = 0;
1972         int sense_deferred = 0;
1973
1974         switch (req_op(req)) {
1975         case REQ_OP_DISCARD:
1976         case REQ_OP_WRITE_ZEROES:
1977         case REQ_OP_WRITE_SAME:
1978         case REQ_OP_ZONE_RESET:
1979         case REQ_OP_ZONE_RESET_ALL:
1980         case REQ_OP_ZONE_OPEN:
1981         case REQ_OP_ZONE_CLOSE:
1982         case REQ_OP_ZONE_FINISH:
1983                 if (!result) {
1984                         good_bytes = blk_rq_bytes(req);
1985                         scsi_set_resid(SCpnt, 0);
1986                 } else {
1987                         good_bytes = 0;
1988                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
1989                 }
1990                 break;
1991         default:
1992                 /*
1993                  * In case of bogus fw or device, we could end up having
1994                  * an unaligned partial completion. Check this here and force
1995                  * alignment.
1996                  */
1997                 resid = scsi_get_resid(SCpnt);
1998                 if (resid & (sector_size - 1)) {
1999                         sd_printk(KERN_INFO, sdkp,
2000                                 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
2001                                 resid, sector_size);
2002                         scsi_print_command(SCpnt);
2003                         resid = min(scsi_bufflen(SCpnt),
2004                                     round_up(resid, sector_size));
2005                         scsi_set_resid(SCpnt, resid);
2006                 }
2007         }
2008
2009         if (result) {
2010                 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
2011                 if (sense_valid)
2012                         sense_deferred = scsi_sense_is_deferred(&sshdr);
2013         }
2014         sdkp->medium_access_timed_out = 0;
2015
2016         if (driver_byte(result) != DRIVER_SENSE &&
2017             (!sense_valid || sense_deferred))
2018                 goto out;
2019
2020         switch (sshdr.sense_key) {
2021         case HARDWARE_ERROR:
2022         case MEDIUM_ERROR:
2023                 good_bytes = sd_completed_bytes(SCpnt);
2024                 break;
2025         case RECOVERED_ERROR:
2026                 good_bytes = scsi_bufflen(SCpnt);
2027                 break;
2028         case NO_SENSE:
2029                 /* This indicates a false check condition, so ignore it.  An
2030                  * unknown amount of data was transferred so treat it as an
2031                  * error.
2032                  */
2033                 SCpnt->result = 0;
2034                 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2035                 break;
2036         case ABORTED_COMMAND:
2037                 if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2038                         good_bytes = sd_completed_bytes(SCpnt);
2039                 break;
2040         case ILLEGAL_REQUEST:
2041                 switch (sshdr.asc) {
2042                 case 0x10:      /* DIX: Host detected corruption */
2043                         good_bytes = sd_completed_bytes(SCpnt);
2044                         break;
2045                 case 0x20:      /* INVALID COMMAND OPCODE */
2046                 case 0x24:      /* INVALID FIELD IN CDB */
2047                         switch (SCpnt->cmnd[0]) {
2048                         case UNMAP:
2049                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2050                                 break;
2051                         case WRITE_SAME_16:
2052                         case WRITE_SAME:
2053                                 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2054                                         sd_config_discard(sdkp, SD_LBP_DISABLE);
2055                                 } else {
2056                                         sdkp->device->no_write_same = 1;
2057                                         sd_config_write_same(sdkp);
2058                                         req->rq_flags |= RQF_QUIET;
2059                                 }
2060                                 break;
2061                         }
2062                 }
2063                 break;
2064         default:
2065                 break;
2066         }
2067
2068  out:
2069         if (sd_is_zoned(sdkp))
2070                 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2071
2072         SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2073                                            "sd_done: completed %d of %d bytes\n",
2074                                            good_bytes, scsi_bufflen(SCpnt)));
2075
2076         return good_bytes;
2077 }
2078
2079 /*
2080  * spinup disk - called only in sd_revalidate_disk()
2081  */
2082 static void
2083 sd_spinup_disk(struct scsi_disk *sdkp)
2084 {
2085         unsigned char cmd[10];
2086         unsigned long spintime_expire = 0;
2087         int retries, spintime;
2088         unsigned int the_result;
2089         struct scsi_sense_hdr sshdr;
2090         int sense_valid = 0;
2091
2092         spintime = 0;
2093
2094         /* Spin up drives, as required.  Only do this at boot time */
2095         /* Spinup needs to be done for module loads too. */
2096         do {
2097                 retries = 0;
2098
2099                 do {
2100                         cmd[0] = TEST_UNIT_READY;
2101                         memset((void *) &cmd[1], 0, 9);
2102
2103                         the_result = scsi_execute_req(sdkp->device, cmd,
2104                                                       DMA_NONE, NULL, 0,
2105                                                       &sshdr, SD_TIMEOUT,
2106                                                       SD_MAX_RETRIES, NULL);
2107
2108                         /*
2109                          * If the drive has indicated to us that it
2110                          * doesn't have any media in it, don't bother
2111                          * with any more polling.
2112                          */
2113                         if (media_not_present(sdkp, &sshdr))
2114                                 return;
2115
2116                         if (the_result)
2117                                 sense_valid = scsi_sense_valid(&sshdr);
2118                         retries++;
2119                 } while (retries < 3 &&
2120                          (!scsi_status_is_good(the_result) ||
2121                           ((driver_byte(the_result) == DRIVER_SENSE) &&
2122                           sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2123
2124                 if (driver_byte(the_result) != DRIVER_SENSE) {
2125                         /* no sense, TUR either succeeded or failed
2126                          * with a status error */
2127                         if(!spintime && !scsi_status_is_good(the_result)) {
2128                                 sd_print_result(sdkp, "Test Unit Ready failed",
2129                                                 the_result);
2130                         }
2131                         break;
2132                 }
2133
2134                 /*
2135                  * The device does not want the automatic start to be issued.
2136                  */
2137                 if (sdkp->device->no_start_on_add)
2138                         break;
2139
2140                 if (sense_valid && sshdr.sense_key == NOT_READY) {
2141                         if (sshdr.asc == 4 && sshdr.ascq == 3)
2142                                 break;  /* manual intervention required */
2143                         if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2144                                 break;  /* standby */
2145                         if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2146                                 break;  /* unavailable */
2147                         if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2148                                 break;  /* sanitize in progress */
2149                         /*
2150                          * Issue command to spin up drive when not ready
2151                          */
2152                         if (!spintime) {
2153                                 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2154                                 cmd[0] = START_STOP;
2155                                 cmd[1] = 1;     /* Return immediately */
2156                                 memset((void *) &cmd[2], 0, 8);
2157                                 cmd[4] = 1;     /* Start spin cycle */
2158                                 if (sdkp->device->start_stop_pwr_cond)
2159                                         cmd[4] |= 1 << 4;
2160                                 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2161                                                  NULL, 0, &sshdr,
2162                                                  SD_TIMEOUT, SD_MAX_RETRIES,
2163                                                  NULL);
2164                                 spintime_expire = jiffies + 100 * HZ;
2165                                 spintime = 1;
2166                         }
2167                         /* Wait 1 second for next try */
2168                         msleep(1000);
2169                         printk(KERN_CONT ".");
2170
2171                 /*
2172                  * Wait for USB flash devices with slow firmware.
2173                  * Yes, this sense key/ASC combination shouldn't
2174                  * occur here.  It's characteristic of these devices.
2175                  */
2176                 } else if (sense_valid &&
2177                                 sshdr.sense_key == UNIT_ATTENTION &&
2178                                 sshdr.asc == 0x28) {
2179                         if (!spintime) {
2180                                 spintime_expire = jiffies + 5 * HZ;
2181                                 spintime = 1;
2182                         }
2183                         /* Wait 1 second for next try */
2184                         msleep(1000);
2185                 } else {
2186                         /* we don't understand the sense code, so it's
2187                          * probably pointless to loop */
2188                         if(!spintime) {
2189                                 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2190                                 sd_print_sense_hdr(sdkp, &sshdr);
2191                         }
2192                         break;
2193                 }
2194
2195         } while (spintime && time_before_eq(jiffies, spintime_expire));
2196
2197         if (spintime) {
2198                 if (scsi_status_is_good(the_result))
2199                         printk(KERN_CONT "ready\n");
2200                 else
2201                         printk(KERN_CONT "not responding...\n");
2202         }
2203 }
2204
2205 /*
2206  * Determine whether disk supports Data Integrity Field.
2207  */
2208 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2209 {
2210         struct scsi_device *sdp = sdkp->device;
2211         u8 type;
2212         int ret = 0;
2213
2214         if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2215                 return ret;
2216
2217         type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2218
2219         if (type > T10_PI_TYPE3_PROTECTION)
2220                 ret = -ENODEV;
2221         else if (scsi_host_dif_capable(sdp->host, type))
2222                 ret = 1;
2223
2224         if (sdkp->first_scan || type != sdkp->protection_type)
2225                 switch (ret) {
2226                 case -ENODEV:
2227                         sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2228                                   " protection type %u. Disabling disk!\n",
2229                                   type);
2230                         break;
2231                 case 1:
2232                         sd_printk(KERN_NOTICE, sdkp,
2233                                   "Enabling DIF Type %u protection\n", type);
2234                         break;
2235                 case 0:
2236                         sd_printk(KERN_NOTICE, sdkp,
2237                                   "Disabling DIF Type %u protection\n", type);
2238                         break;
2239                 }
2240
2241         sdkp->protection_type = type;
2242
2243         return ret;
2244 }
2245
2246 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2247                         struct scsi_sense_hdr *sshdr, int sense_valid,
2248                         int the_result)
2249 {
2250         if (driver_byte(the_result) == DRIVER_SENSE)
2251                 sd_print_sense_hdr(sdkp, sshdr);
2252         else
2253                 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2254
2255         /*
2256          * Set dirty bit for removable devices if not ready -
2257          * sometimes drives will not report this properly.
2258          */
2259         if (sdp->removable &&
2260             sense_valid && sshdr->sense_key == NOT_READY)
2261                 set_media_not_present(sdkp);
2262
2263         /*
2264          * We used to set media_present to 0 here to indicate no media
2265          * in the drive, but some drives fail read capacity even with
2266          * media present, so we can't do that.
2267          */
2268         sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2269 }
2270
2271 #define RC16_LEN 32
2272 #if RC16_LEN > SD_BUF_SIZE
2273 #error RC16_LEN must not be more than SD_BUF_SIZE
2274 #endif
2275
2276 #define READ_CAPACITY_RETRIES_ON_RESET  10
2277
2278 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2279                                                 unsigned char *buffer)
2280 {
2281         unsigned char cmd[16];
2282         struct scsi_sense_hdr sshdr;
2283         int sense_valid = 0;
2284         int the_result;
2285         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2286         unsigned int alignment;
2287         unsigned long long lba;
2288         unsigned sector_size;
2289
2290         if (sdp->no_read_capacity_16)
2291                 return -EINVAL;
2292
2293         do {
2294                 memset(cmd, 0, 16);
2295                 cmd[0] = SERVICE_ACTION_IN_16;
2296                 cmd[1] = SAI_READ_CAPACITY_16;
2297                 cmd[13] = RC16_LEN;
2298                 memset(buffer, 0, RC16_LEN);
2299
2300                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2301                                         buffer, RC16_LEN, &sshdr,
2302                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2303
2304                 if (media_not_present(sdkp, &sshdr))
2305                         return -ENODEV;
2306
2307                 if (the_result) {
2308                         sense_valid = scsi_sense_valid(&sshdr);
2309                         if (sense_valid &&
2310                             sshdr.sense_key == ILLEGAL_REQUEST &&
2311                             (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2312                             sshdr.ascq == 0x00)
2313                                 /* Invalid Command Operation Code or
2314                                  * Invalid Field in CDB, just retry
2315                                  * silently with RC10 */
2316                                 return -EINVAL;
2317                         if (sense_valid &&
2318                             sshdr.sense_key == UNIT_ATTENTION &&
2319                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2320                                 /* Device reset might occur several times,
2321                                  * give it one more chance */
2322                                 if (--reset_retries > 0)
2323                                         continue;
2324                 }
2325                 retries--;
2326
2327         } while (the_result && retries);
2328
2329         if (the_result) {
2330                 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2331                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2332                 return -EINVAL;
2333         }
2334
2335         sector_size = get_unaligned_be32(&buffer[8]);
2336         lba = get_unaligned_be64(&buffer[0]);
2337
2338         if (sd_read_protection_type(sdkp, buffer) < 0) {
2339                 sdkp->capacity = 0;
2340                 return -ENODEV;
2341         }
2342
2343         /* Logical blocks per physical block exponent */
2344         sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2345
2346         /* RC basis */
2347         sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2348
2349         /* Lowest aligned logical block */
2350         alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2351         blk_queue_alignment_offset(sdp->request_queue, alignment);
2352         if (alignment && sdkp->first_scan)
2353                 sd_printk(KERN_NOTICE, sdkp,
2354                           "physical block alignment offset: %u\n", alignment);
2355
2356         if (buffer[14] & 0x80) { /* LBPME */
2357                 sdkp->lbpme = 1;
2358
2359                 if (buffer[14] & 0x40) /* LBPRZ */
2360                         sdkp->lbprz = 1;
2361
2362                 sd_config_discard(sdkp, SD_LBP_WS16);
2363         }
2364
2365         sdkp->capacity = lba + 1;
2366         return sector_size;
2367 }
2368
2369 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2370                                                 unsigned char *buffer)
2371 {
2372         unsigned char cmd[16];
2373         struct scsi_sense_hdr sshdr;
2374         int sense_valid = 0;
2375         int the_result;
2376         int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2377         sector_t lba;
2378         unsigned sector_size;
2379
2380         do {
2381                 cmd[0] = READ_CAPACITY;
2382                 memset(&cmd[1], 0, 9);
2383                 memset(buffer, 0, 8);
2384
2385                 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2386                                         buffer, 8, &sshdr,
2387                                         SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2388
2389                 if (media_not_present(sdkp, &sshdr))
2390                         return -ENODEV;
2391
2392                 if (the_result) {
2393                         sense_valid = scsi_sense_valid(&sshdr);
2394                         if (sense_valid &&
2395                             sshdr.sense_key == UNIT_ATTENTION &&
2396                             sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2397                                 /* Device reset might occur several times,
2398                                  * give it one more chance */
2399                                 if (--reset_retries > 0)
2400                                         continue;
2401                 }
2402                 retries--;
2403
2404         } while (the_result && retries);
2405
2406         if (the_result) {
2407                 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2408                 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2409                 return -EINVAL;
2410         }
2411
2412         sector_size = get_unaligned_be32(&buffer[4]);
2413         lba = get_unaligned_be32(&buffer[0]);
2414
2415         if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2416                 /* Some buggy (usb cardreader) devices return an lba of
2417                    0xffffffff when the want to report a size of 0 (with
2418                    which they really mean no media is present) */
2419                 sdkp->capacity = 0;
2420                 sdkp->physical_block_size = sector_size;
2421                 return sector_size;
2422         }
2423
2424         sdkp->capacity = lba + 1;
2425         sdkp->physical_block_size = sector_size;
2426         return sector_size;
2427 }
2428
2429 static int sd_try_rc16_first(struct scsi_device *sdp)
2430 {
2431         if (sdp->host->max_cmd_len < 16)
2432                 return 0;
2433         if (sdp->try_rc_10_first)
2434                 return 0;
2435         if (sdp->scsi_level > SCSI_SPC_2)
2436                 return 1;
2437         if (scsi_device_protection(sdp))
2438                 return 1;
2439         return 0;
2440 }
2441
2442 /*
2443  * read disk capacity
2444  */
2445 static void
2446 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2447 {
2448         int sector_size;
2449         struct scsi_device *sdp = sdkp->device;
2450
2451         if (sd_try_rc16_first(sdp)) {
2452                 sector_size = read_capacity_16(sdkp, sdp, buffer);
2453                 if (sector_size == -EOVERFLOW)
2454                         goto got_data;
2455                 if (sector_size == -ENODEV)
2456                         return;
2457                 if (sector_size < 0)
2458                         sector_size = read_capacity_10(sdkp, sdp, buffer);
2459                 if (sector_size < 0)
2460                         return;
2461         } else {
2462                 sector_size = read_capacity_10(sdkp, sdp, buffer);
2463                 if (sector_size == -EOVERFLOW)
2464                         goto got_data;
2465                 if (sector_size < 0)
2466                         return;
2467                 if ((sizeof(sdkp->capacity) > 4) &&
2468                     (sdkp->capacity > 0xffffffffULL)) {
2469                         int old_sector_size = sector_size;
2470                         sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2471                                         "Trying to use READ CAPACITY(16).\n");
2472                         sector_size = read_capacity_16(sdkp, sdp, buffer);
2473                         if (sector_size < 0) {
2474                                 sd_printk(KERN_NOTICE, sdkp,
2475                                         "Using 0xffffffff as device size\n");
2476                                 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2477                                 sector_size = old_sector_size;
2478                                 goto got_data;
2479                         }
2480                         /* Remember that READ CAPACITY(16) succeeded */
2481                         sdp->try_rc_10_first = 0;
2482                 }
2483         }
2484
2485         /* Some devices are known to return the total number of blocks,
2486          * not the highest block number.  Some devices have versions
2487          * which do this and others which do not.  Some devices we might
2488          * suspect of doing this but we don't know for certain.
2489          *
2490          * If we know the reported capacity is wrong, decrement it.  If
2491          * we can only guess, then assume the number of blocks is even
2492          * (usually true but not always) and err on the side of lowering
2493          * the capacity.
2494          */
2495         if (sdp->fix_capacity ||
2496             (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2497                 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2498                                 "from its reported value: %llu\n",
2499                                 (unsigned long long) sdkp->capacity);
2500                 --sdkp->capacity;
2501         }
2502
2503 got_data:
2504         if (sector_size == 0) {
2505                 sector_size = 512;
2506                 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2507                           "assuming 512.\n");
2508         }
2509
2510         if (sector_size != 512 &&
2511             sector_size != 1024 &&
2512             sector_size != 2048 &&
2513             sector_size != 4096) {
2514                 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2515                           sector_size);
2516                 /*
2517                  * The user might want to re-format the drive with
2518                  * a supported sectorsize.  Once this happens, it
2519                  * would be relatively trivial to set the thing up.
2520                  * For this reason, we leave the thing in the table.
2521                  */
2522                 sdkp->capacity = 0;
2523                 /*
2524                  * set a bogus sector size so the normal read/write
2525                  * logic in the block layer will eventually refuse any
2526                  * request on this device without tripping over power
2527                  * of two sector size assumptions
2528                  */
2529                 sector_size = 512;
2530         }
2531         blk_queue_logical_block_size(sdp->request_queue, sector_size);
2532         blk_queue_physical_block_size(sdp->request_queue,
2533                                       sdkp->physical_block_size);
2534         sdkp->device->sector_size = sector_size;
2535
2536         if (sdkp->capacity > 0xffffffff)
2537                 sdp->use_16_for_rw = 1;
2538
2539 }
2540
2541 /*
2542  * Print disk capacity
2543  */
2544 static void
2545 sd_print_capacity(struct scsi_disk *sdkp,
2546                   sector_t old_capacity)
2547 {
2548         int sector_size = sdkp->device->sector_size;
2549         char cap_str_2[10], cap_str_10[10];
2550
2551         if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2552                 return;
2553
2554         string_get_size(sdkp->capacity, sector_size,
2555                         STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2556         string_get_size(sdkp->capacity, sector_size,
2557                         STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
2558
2559         sd_printk(KERN_NOTICE, sdkp,
2560                   "%llu %d-byte logical blocks: (%s/%s)\n",
2561                   (unsigned long long)sdkp->capacity,
2562                   sector_size, cap_str_10, cap_str_2);
2563
2564         if (sdkp->physical_block_size != sector_size)
2565                 sd_printk(KERN_NOTICE, sdkp,
2566                           "%u-byte physical blocks\n",
2567                           sdkp->physical_block_size);
2568
2569         sd_zbc_print_zones(sdkp);
2570 }
2571
2572 /* called with buffer of length 512 */
2573 static inline int
2574 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2575                  unsigned char *buffer, int len, struct scsi_mode_data *data,
2576                  struct scsi_sense_hdr *sshdr)
2577 {
2578         return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2579                                SD_TIMEOUT, SD_MAX_RETRIES, data,
2580                                sshdr);
2581 }
2582
2583 /*
2584  * read write protect setting, if possible - called only in sd_revalidate_disk()
2585  * called with buffer of length SD_BUF_SIZE
2586  */
2587 static void
2588 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2589 {
2590         int res;
2591         struct scsi_device *sdp = sdkp->device;
2592         struct scsi_mode_data data;
2593         int old_wp = sdkp->write_prot;
2594
2595         set_disk_ro(sdkp->disk, 0);
2596         if (sdp->skip_ms_page_3f) {
2597                 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2598                 return;
2599         }
2600
2601         if (sdp->use_192_bytes_for_3f) {
2602                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2603         } else {
2604                 /*
2605                  * First attempt: ask for all pages (0x3F), but only 4 bytes.
2606                  * We have to start carefully: some devices hang if we ask
2607                  * for more than is available.
2608                  */
2609                 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2610
2611                 /*
2612                  * Second attempt: ask for page 0 When only page 0 is
2613                  * implemented, a request for page 3F may return Sense Key
2614                  * 5: Illegal Request, Sense Code 24: Invalid field in
2615                  * CDB.
2616                  */
2617                 if (!scsi_status_is_good(res))
2618                         res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2619
2620                 /*
2621                  * Third attempt: ask 255 bytes, as we did earlier.
2622                  */
2623                 if (!scsi_status_is_good(res))
2624                         res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2625                                                &data, NULL);
2626         }
2627
2628         if (!scsi_status_is_good(res)) {
2629                 sd_first_printk(KERN_WARNING, sdkp,
2630                           "Test WP failed, assume Write Enabled\n");
2631         } else {
2632                 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2633                 set_disk_ro(sdkp->disk, sdkp->write_prot);
2634                 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2635                         sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2636                                   sdkp->write_prot ? "on" : "off");
2637                         sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2638                 }
2639         }
2640 }
2641
2642 /*
2643  * sd_read_cache_type - called only from sd_revalidate_disk()
2644  * called with buffer of length SD_BUF_SIZE
2645  */
2646 static void
2647 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2648 {
2649         int len = 0, res;
2650         struct scsi_device *sdp = sdkp->device;
2651
2652         int dbd;
2653         int modepage;
2654         int first_len;
2655         struct scsi_mode_data data;
2656         struct scsi_sense_hdr sshdr;
2657         int old_wce = sdkp->WCE;
2658         int old_rcd = sdkp->RCD;
2659         int old_dpofua = sdkp->DPOFUA;
2660
2661
2662         if (sdkp->cache_override)
2663                 return;
2664
2665         first_len = 4;
2666         if (sdp->skip_ms_page_8) {
2667                 if (sdp->type == TYPE_RBC)
2668                         goto defaults;
2669                 else {
2670                         if (sdp->skip_ms_page_3f)
2671                                 goto defaults;
2672                         modepage = 0x3F;
2673                         if (sdp->use_192_bytes_for_3f)
2674                                 first_len = 192;
2675                         dbd = 0;
2676                 }
2677         } else if (sdp->type == TYPE_RBC) {
2678                 modepage = 6;
2679                 dbd = 8;
2680         } else {
2681                 modepage = 8;
2682                 dbd = 0;
2683         }
2684
2685         /* cautiously ask */
2686         res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2687                         &data, &sshdr);
2688
2689         if (!scsi_status_is_good(res))
2690                 goto bad_sense;
2691
2692         if (!data.header_length) {
2693                 modepage = 6;
2694                 first_len = 0;
2695                 sd_first_printk(KERN_ERR, sdkp,
2696                                 "Missing header in MODE_SENSE response\n");
2697         }
2698
2699         /* that went OK, now ask for the proper length */
2700         len = data.length;
2701
2702         /*
2703          * We're only interested in the first three bytes, actually.
2704          * But the data cache page is defined for the first 20.
2705          */
2706         if (len < 3)
2707                 goto bad_sense;
2708         else if (len > SD_BUF_SIZE) {
2709                 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2710                           "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2711                 len = SD_BUF_SIZE;
2712         }
2713         if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2714                 len = 192;
2715
2716         /* Get the data */
2717         if (len > first_len)
2718                 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2719                                 &data, &sshdr);
2720
2721         if (scsi_status_is_good(res)) {
2722                 int offset = data.header_length + data.block_descriptor_length;
2723
2724                 while (offset < len) {
2725                         u8 page_code = buffer[offset] & 0x3F;
2726                         u8 spf       = buffer[offset] & 0x40;
2727
2728                         if (page_code == 8 || page_code == 6) {
2729                                 /* We're interested only in the first 3 bytes.
2730                                  */
2731                                 if (len - offset <= 2) {
2732                                         sd_first_printk(KERN_ERR, sdkp,
2733                                                 "Incomplete mode parameter "
2734                                                         "data\n");
2735                                         goto defaults;
2736                                 } else {
2737                                         modepage = page_code;
2738                                         goto Page_found;
2739                                 }
2740                         } else {
2741                                 /* Go to the next page */
2742                                 if (spf && len - offset > 3)
2743                                         offset += 4 + (buffer[offset+2] << 8) +
2744                                                 buffer[offset+3];
2745                                 else if (!spf && len - offset > 1)
2746                                         offset += 2 + buffer[offset+1];
2747                                 else {
2748                                         sd_first_printk(KERN_ERR, sdkp,
2749                                                         "Incomplete mode "
2750                                                         "parameter data\n");
2751                                         goto defaults;
2752                                 }
2753                         }
2754                 }
2755
2756                 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2757                 goto defaults;
2758
2759         Page_found:
2760                 if (modepage == 8) {
2761                         sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2762                         sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2763                 } else {
2764                         sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2765                         sdkp->RCD = 0;
2766                 }
2767
2768                 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2769                 if (sdp->broken_fua) {
2770                         sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2771                         sdkp->DPOFUA = 0;
2772                 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2773                            !sdkp->device->use_16_for_rw) {
2774                         sd_first_printk(KERN_NOTICE, sdkp,
2775                                   "Uses READ/WRITE(6), disabling FUA\n");
2776                         sdkp->DPOFUA = 0;
2777                 }
2778
2779                 /* No cache flush allowed for write protected devices */
2780                 if (sdkp->WCE && sdkp->write_prot)
2781                         sdkp->WCE = 0;
2782
2783                 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2784                     old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2785                         sd_printk(KERN_NOTICE, sdkp,
2786                                   "Write cache: %s, read cache: %s, %s\n",
2787                                   sdkp->WCE ? "enabled" : "disabled",
2788                                   sdkp->RCD ? "disabled" : "enabled",
2789                                   sdkp->DPOFUA ? "supports DPO and FUA"
2790                                   : "doesn't support DPO or FUA");
2791
2792                 return;
2793         }
2794
2795 bad_sense:
2796         if (scsi_sense_valid(&sshdr) &&
2797             sshdr.sense_key == ILLEGAL_REQUEST &&
2798             sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2799                 /* Invalid field in CDB */
2800                 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2801         else
2802                 sd_first_printk(KERN_ERR, sdkp,
2803                                 "Asking for cache data failed\n");
2804
2805 defaults:
2806         if (sdp->wce_default_on) {
2807                 sd_first_printk(KERN_NOTICE, sdkp,
2808                                 "Assuming drive cache: write back\n");
2809                 sdkp->WCE = 1;
2810         } else {
2811                 sd_first_printk(KERN_ERR, sdkp,
2812                                 "Assuming drive cache: write through\n");
2813                 sdkp->WCE = 0;
2814         }
2815         sdkp->RCD = 0;
2816         sdkp->DPOFUA = 0;
2817 }
2818
2819 /*
2820  * The ATO bit indicates whether the DIF application tag is available
2821  * for use by the operating system.
2822  */
2823 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2824 {
2825         int res, offset;
2826         struct scsi_device *sdp = sdkp->device;
2827         struct scsi_mode_data data;
2828         struct scsi_sense_hdr sshdr;
2829
2830         if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2831                 return;
2832
2833         if (sdkp->protection_type == 0)
2834                 return;
2835
2836         res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2837                               SD_MAX_RETRIES, &data, &sshdr);
2838
2839         if (!scsi_status_is_good(res) || !data.header_length ||
2840             data.length < 6) {
2841                 sd_first_printk(KERN_WARNING, sdkp,
2842                           "getting Control mode page failed, assume no ATO\n");
2843
2844                 if (scsi_sense_valid(&sshdr))
2845                         sd_print_sense_hdr(sdkp, &sshdr);
2846
2847                 return;
2848         }
2849
2850         offset = data.header_length + data.block_descriptor_length;
2851
2852         if ((buffer[offset] & 0x3f) != 0x0a) {
2853                 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2854                 return;
2855         }
2856
2857         if ((buffer[offset + 5] & 0x80) == 0)
2858                 return;
2859
2860         sdkp->ATO = 1;
2861
2862         return;
2863 }
2864
2865 /**
2866  * sd_read_block_limits - Query disk device for preferred I/O sizes.
2867  * @sdkp: disk to query
2868  */
2869 static void sd_read_block_limits(struct scsi_disk *sdkp)
2870 {
2871         unsigned int sector_sz = sdkp->device->sector_size;
2872         const int vpd_len = 64;
2873         unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2874
2875         if (!buffer ||
2876             /* Block Limits VPD */
2877             scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2878                 goto out;
2879
2880         blk_queue_io_min(sdkp->disk->queue,
2881                          get_unaligned_be16(&buffer[6]) * sector_sz);
2882
2883         sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2884         sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2885
2886         if (buffer[3] == 0x3c) {
2887                 unsigned int lba_count, desc_count;
2888
2889                 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2890
2891                 if (!sdkp->lbpme)
2892                         goto out;
2893
2894                 lba_count = get_unaligned_be32(&buffer[20]);
2895                 desc_count = get_unaligned_be32(&buffer[24]);
2896
2897                 if (lba_count && desc_count)
2898                         sdkp->max_unmap_blocks = lba_count;
2899
2900                 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2901
2902                 if (buffer[32] & 0x80)
2903                         sdkp->unmap_alignment =
2904                                 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2905
2906                 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2907
2908                         if (sdkp->max_unmap_blocks)
2909                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2910                         else
2911                                 sd_config_discard(sdkp, SD_LBP_WS16);
2912
2913                 } else {        /* LBP VPD page tells us what to use */
2914                         if (sdkp->lbpu && sdkp->max_unmap_blocks)
2915                                 sd_config_discard(sdkp, SD_LBP_UNMAP);
2916                         else if (sdkp->lbpws)
2917                                 sd_config_discard(sdkp, SD_LBP_WS16);
2918                         else if (sdkp->lbpws10)
2919                                 sd_config_discard(sdkp, SD_LBP_WS10);
2920                         else
2921                                 sd_config_discard(sdkp, SD_LBP_DISABLE);
2922                 }
2923         }
2924
2925  out:
2926         kfree(buffer);
2927 }
2928
2929 /**
2930  * sd_read_block_characteristics - Query block dev. characteristics
2931  * @sdkp: disk to query
2932  */
2933 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2934 {
2935         struct request_queue *q = sdkp->disk->queue;
2936         unsigned char *buffer;
2937         u16 rot;
2938         const int vpd_len = 64;
2939
2940         buffer = kmalloc(vpd_len, GFP_KERNEL);
2941
2942         if (!buffer ||
2943             /* Block Device Characteristics VPD */
2944             scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2945                 goto out;
2946
2947         rot = get_unaligned_be16(&buffer[4]);
2948
2949         if (rot == 1) {
2950                 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2951                 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2952         }
2953
2954         if (sdkp->device->type == TYPE_ZBC) {
2955                 /* Host-managed */
2956                 q->limits.zoned = BLK_ZONED_HM;
2957         } else {
2958                 sdkp->zoned = (buffer[8] >> 4) & 3;
2959                 if (sdkp->zoned == 1)
2960                         /* Host-aware */
2961                         q->limits.zoned = BLK_ZONED_HA;
2962                 else
2963                         /*
2964                          * Treat drive-managed devices as
2965                          * regular block devices.
2966                          */
2967                         q->limits.zoned = BLK_ZONED_NONE;
2968         }
2969         if (blk_queue_is_zoned(q) && sdkp->first_scan)
2970                 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2971                       q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2972
2973  out:
2974         kfree(buffer);
2975 }
2976
2977 /**
2978  * sd_read_block_provisioning - Query provisioning VPD page
2979  * @sdkp: disk to query
2980  */
2981 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2982 {
2983         unsigned char *buffer;
2984         const int vpd_len = 8;
2985
2986         if (sdkp->lbpme == 0)
2987                 return;
2988
2989         buffer = kmalloc(vpd_len, GFP_KERNEL);
2990
2991         if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2992                 goto out;
2993
2994         sdkp->lbpvpd    = 1;
2995         sdkp->lbpu      = (buffer[5] >> 7) & 1; /* UNMAP */
2996         sdkp->lbpws     = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2997         sdkp->lbpws10   = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2998
2999  out:
3000         kfree(buffer);
3001 }
3002
3003 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3004 {
3005         struct scsi_device *sdev = sdkp->device;
3006
3007         if (sdev->host->no_write_same) {
3008                 sdev->no_write_same = 1;
3009
3010                 return;
3011         }
3012
3013         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
3014                 /* too large values might cause issues with arcmsr */
3015                 int vpd_buf_len = 64;
3016
3017                 sdev->no_report_opcodes = 1;
3018
3019                 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3020                  * CODES is unsupported and the device has an ATA
3021                  * Information VPD page (SAT).
3022                  */
3023                 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3024                         sdev->no_write_same = 1;
3025         }
3026
3027         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3028                 sdkp->ws16 = 1;
3029
3030         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3031                 sdkp->ws10 = 1;
3032 }
3033
3034 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3035 {
3036         struct scsi_device *sdev = sdkp->device;
3037
3038         if (!sdev->security_supported)
3039                 return;
3040
3041         if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3042                         SECURITY_PROTOCOL_IN) == 1 &&
3043             scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3044                         SECURITY_PROTOCOL_OUT) == 1)
3045                 sdkp->security = 1;
3046 }
3047
3048 /*
3049  * Determine the device's preferred I/O size for reads and writes
3050  * unless the reported value is unreasonably small, large, not a
3051  * multiple of the physical block size, or simply garbage.
3052  */
3053 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3054                                       unsigned int dev_max)
3055 {
3056         struct scsi_device *sdp = sdkp->device;
3057         unsigned int opt_xfer_bytes =
3058                 logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3059
3060         if (sdkp->opt_xfer_blocks == 0)
3061                 return false;
3062
3063         if (sdkp->opt_xfer_blocks > dev_max) {
3064                 sd_first_printk(KERN_WARNING, sdkp,
3065                                 "Optimal transfer size %u logical blocks " \
3066                                 "> dev_max (%u logical blocks)\n",
3067                                 sdkp->opt_xfer_blocks, dev_max);
3068                 return false;
3069         }
3070
3071         if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3072                 sd_first_printk(KERN_WARNING, sdkp,
3073                                 "Optimal transfer size %u logical blocks " \
3074                                 "> sd driver limit (%u logical blocks)\n",
3075                                 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3076                 return false;
3077         }
3078
3079         if (opt_xfer_bytes < PAGE_SIZE) {
3080                 sd_first_printk(KERN_WARNING, sdkp,
3081                                 "Optimal transfer size %u bytes < " \
3082                                 "PAGE_SIZE (%u bytes)\n",
3083                                 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3084                 return false;
3085         }
3086
3087         if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3088                 sd_first_printk(KERN_WARNING, sdkp,
3089                                 "Optimal transfer size %u bytes not a " \
3090                                 "multiple of physical block size (%u bytes)\n",
3091                                 opt_xfer_bytes, sdkp->physical_block_size);
3092                 return false;
3093         }
3094
3095         sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3096                         opt_xfer_bytes);
3097         return true;
3098 }
3099
3100 /**
3101  *      sd_revalidate_disk - called the first time a new disk is seen,
3102  *      performs disk spin up, read_capacity, etc.
3103  *      @disk: struct gendisk we care about
3104  **/
3105 static int sd_revalidate_disk(struct gendisk *disk)
3106 {
3107         struct scsi_disk *sdkp = scsi_disk(disk);
3108         struct scsi_device *sdp = sdkp->device;
3109         struct request_queue *q = sdkp->disk->queue;
3110         sector_t old_capacity = sdkp->capacity;
3111         unsigned char *buffer;
3112         unsigned int dev_max, rw_max;
3113
3114         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3115                                       "sd_revalidate_disk\n"));
3116
3117         /*
3118          * If the device is offline, don't try and read capacity or any
3119          * of the other niceties.
3120          */
3121         if (!scsi_device_online(sdp))
3122                 goto out;
3123
3124         buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3125         if (!buffer) {
3126                 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3127                           "allocation failure.\n");
3128                 goto out;
3129         }
3130
3131         sd_spinup_disk(sdkp);
3132
3133         /*
3134          * Without media there is no reason to ask; moreover, some devices
3135          * react badly if we do.
3136          */
3137         if (sdkp->media_present) {
3138                 sd_read_capacity(sdkp, buffer);
3139
3140                 /*
3141                  * set the default to rotational.  All non-rotational devices
3142                  * support the block characteristics VPD page, which will
3143                  * cause this to be updated correctly and any device which
3144                  * doesn't support it should be treated as rotational.
3145                  */
3146                 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
3147                 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
3148
3149                 if (scsi_device_supports_vpd(sdp)) {
3150                         sd_read_block_provisioning(sdkp);
3151                         sd_read_block_limits(sdkp);
3152                         sd_read_block_characteristics(sdkp);
3153                         sd_zbc_read_zones(sdkp, buffer);
3154                 }
3155
3156                 sd_print_capacity(sdkp, old_capacity);
3157
3158                 sd_read_write_protect_flag(sdkp, buffer);
3159                 sd_read_cache_type(sdkp, buffer);
3160                 sd_read_app_tag_own(sdkp, buffer);
3161                 sd_read_write_same(sdkp, buffer);
3162                 sd_read_security(sdkp, buffer);
3163         }
3164
3165         /*
3166          * We now have all cache related info, determine how we deal
3167          * with flush requests.
3168          */
3169         sd_set_flush_flag(sdkp);
3170
3171         /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3172         dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3173
3174         /* Some devices report a maximum block count for READ/WRITE requests. */
3175         dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3176         q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3177
3178         if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3179                 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3180                 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3181         } else
3182                 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3183                                       (sector_t)BLK_DEF_MAX_SECTORS);
3184
3185         /* Do not exceed controller limit */
3186         rw_max = min(rw_max, queue_max_hw_sectors(q));
3187
3188         /*
3189          * Only update max_sectors if previously unset or if the current value
3190          * exceeds the capabilities of the hardware.
3191          */
3192         if (sdkp->first_scan ||
3193             q->limits.max_sectors > q->limits.max_dev_sectors ||
3194             q->limits.max_sectors > q->limits.max_hw_sectors)
3195                 q->limits.max_sectors = rw_max;
3196
3197         sdkp->first_scan = 0;
3198
3199         set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3200         sd_config_write_same(sdkp);
3201         kfree(buffer);
3202
3203  out:
3204         return 0;
3205 }
3206
3207 /**
3208  *      sd_unlock_native_capacity - unlock native capacity
3209  *      @disk: struct gendisk to set capacity for
3210  *
3211  *      Block layer calls this function if it detects that partitions
3212  *      on @disk reach beyond the end of the device.  If the SCSI host
3213  *      implements ->unlock_native_capacity() method, it's invoked to
3214  *      give it a chance to adjust the device capacity.
3215  *
3216  *      CONTEXT:
3217  *      Defined by block layer.  Might sleep.
3218  */
3219 static void sd_unlock_native_capacity(struct gendisk *disk)
3220 {
3221         struct scsi_device *sdev = scsi_disk(disk)->device;
3222
3223         if (sdev->host->hostt->unlock_native_capacity)
3224                 sdev->host->hostt->unlock_native_capacity(sdev);
3225 }
3226
3227 /**
3228  *      sd_format_disk_name - format disk name
3229  *      @prefix: name prefix - ie. "sd" for SCSI disks
3230  *      @index: index of the disk to format name for
3231  *      @buf: output buffer
3232  *      @buflen: length of the output buffer
3233  *
3234  *      SCSI disk names starts at sda.  The 26th device is sdz and the
3235  *      27th is sdaa.  The last one for two lettered suffix is sdzz
3236  *      which is followed by sdaaa.
3237  *
3238  *      This is basically 26 base counting with one extra 'nil' entry
3239  *      at the beginning from the second digit on and can be
3240  *      determined using similar method as 26 base conversion with the
3241  *      index shifted -1 after each digit is computed.
3242  *
3243  *      CONTEXT:
3244  *      Don't care.
3245  *
3246  *      RETURNS:
3247  *      0 on success, -errno on failure.
3248  */
3249 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3250 {
3251         const int base = 'z' - 'a' + 1;
3252         char *begin = buf + strlen(prefix);
3253         char *end = buf + buflen;
3254         char *p;
3255         int unit;
3256
3257         p = end - 1;
3258         *p = '\0';
3259         unit = base;
3260         do {
3261                 if (p == begin)
3262                         return -EINVAL;
3263                 *--p = 'a' + (index % unit);
3264                 index = (index / unit) - 1;
3265         } while (index >= 0);
3266
3267         memmove(begin, p, end - p);
3268         memcpy(buf, prefix, strlen(prefix));
3269
3270         return 0;
3271 }
3272
3273 /**
3274  *      sd_probe - called during driver initialization and whenever a
3275  *      new scsi device is attached to the system. It is called once
3276  *      for each scsi device (not just disks) present.
3277  *      @dev: pointer to device object
3278  *
3279  *      Returns 0 if successful (or not interested in this scsi device
3280  *      (e.g. scanner)); 1 when there is an error.
3281  *
3282  *      Note: this function is invoked from the scsi mid-level.
3283  *      This function sets up the mapping between a given
3284  *      <host,channel,id,lun> (found in sdp) and new device name
3285  *      (e.g. /dev/sda). More precisely it is the block device major
3286  *      and minor number that is chosen here.
3287  *
3288  *      Assume sd_probe is not re-entrant (for time being)
3289  *      Also think about sd_probe() and sd_remove() running coincidentally.
3290  **/
3291 static int sd_probe(struct device *dev)
3292 {
3293         struct scsi_device *sdp = to_scsi_device(dev);
3294         struct scsi_disk *sdkp;
3295         struct gendisk *gd;
3296         int index;
3297         int error;
3298
3299         scsi_autopm_get_device(sdp);
3300         error = -ENODEV;
3301         if (sdp->type != TYPE_DISK &&
3302             sdp->type != TYPE_ZBC &&
3303             sdp->type != TYPE_MOD &&
3304             sdp->type != TYPE_RBC)
3305                 goto out;
3306
3307 #ifndef CONFIG_BLK_DEV_ZONED
3308         if (sdp->type == TYPE_ZBC)
3309                 goto out;
3310 #endif
3311         SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3312                                         "sd_probe\n"));
3313
3314         error = -ENOMEM;
3315         sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3316         if (!sdkp)
3317                 goto out;
3318
3319         gd = alloc_disk(SD_MINORS);
3320         if (!gd)
3321                 goto out_free;
3322
3323         index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3324         if (index < 0) {
3325                 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3326                 goto out_put;
3327         }
3328
3329         error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3330         if (error) {
3331                 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3332                 goto out_free_index;
3333         }
3334
3335         sdkp->device = sdp;
3336         sdkp->driver = &sd_template;
3337         sdkp->disk = gd;
3338         sdkp->index = index;
3339         atomic_set(&sdkp->openers, 0);
3340         atomic_set(&sdkp->device->ioerr_cnt, 0);
3341
3342         if (!sdp->request_queue->rq_timeout) {
3343                 if (sdp->type != TYPE_MOD)
3344                         blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3345                 else
3346                         blk_queue_rq_timeout(sdp->request_queue,
3347                                              SD_MOD_TIMEOUT);
3348         }
3349
3350         device_initialize(&sdkp->dev);
3351         sdkp->dev.parent = dev;
3352         sdkp->dev.class = &sd_disk_class;
3353         dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3354
3355         error = device_add(&sdkp->dev);
3356         if (error)
3357                 goto out_free_index;
3358
3359         get_device(dev);
3360         dev_set_drvdata(dev, sdkp);
3361
3362         gd->major = sd_major((index & 0xf0) >> 4);
3363         gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3364
3365         gd->fops = &sd_fops;
3366         gd->private_data = &sdkp->driver;
3367         gd->queue = sdkp->device->request_queue;
3368
3369         /* defaults, until the device tells us otherwise */
3370         sdp->sector_size = 512;
3371         sdkp->capacity = 0;
3372         sdkp->media_present = 1;
3373         sdkp->write_prot = 0;
3374         sdkp->cache_override = 0;
3375         sdkp->WCE = 0;
3376         sdkp->RCD = 0;
3377         sdkp->ATO = 0;
3378         sdkp->first_scan = 1;
3379         sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3380
3381         sd_revalidate_disk(gd);
3382
3383         gd->flags = GENHD_FL_EXT_DEVT;
3384         if (sdp->removable) {
3385                 gd->flags |= GENHD_FL_REMOVABLE;
3386                 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3387                 gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
3388         }
3389
3390         blk_pm_runtime_init(sdp->request_queue, dev);
3391         if (sdp->rpm_autosuspend) {
3392                 pm_runtime_set_autosuspend_delay(dev,
3393                         sdp->host->hostt->rpm_autosuspend_delay);
3394         }
3395         device_add_disk(dev, gd, NULL);
3396         if (sdkp->capacity)
3397                 sd_dif_config_host(sdkp);
3398
3399         sd_revalidate_disk(gd);
3400
3401         if (sdkp->security) {
3402                 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3403                 if (sdkp->opal_dev)
3404                         sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3405         }
3406
3407         sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3408                   sdp->removable ? "removable " : "");
3409         scsi_autopm_put_device(sdp);
3410
3411         return 0;
3412
3413  out_free_index:
3414         ida_free(&sd_index_ida, index);
3415  out_put:
3416         put_disk(gd);
3417  out_free:
3418         kfree(sdkp);
3419  out:
3420         scsi_autopm_put_device(sdp);
3421         return error;
3422 }
3423
3424 /**
3425  *      sd_remove - called whenever a scsi disk (previously recognized by
3426  *      sd_probe) is detached from the system. It is called (potentially
3427  *      multiple times) during sd module unload.
3428  *      @dev: pointer to device object
3429  *
3430  *      Note: this function is invoked from the scsi mid-level.
3431  *      This function potentially frees up a device name (e.g. /dev/sdc)
3432  *      that could be re-used by a subsequent sd_probe().
3433  *      This function is not called when the built-in sd driver is "exit-ed".
3434  **/
3435 static int sd_remove(struct device *dev)
3436 {
3437         struct scsi_disk *sdkp;
3438         dev_t devt;
3439
3440         sdkp = dev_get_drvdata(dev);
3441         devt = disk_devt(sdkp->disk);
3442         scsi_autopm_get_device(sdkp->device);
3443
3444         async_synchronize_full_domain(&scsi_sd_pm_domain);
3445         device_del(&sdkp->dev);
3446         del_gendisk(sdkp->disk);
3447         sd_shutdown(dev);
3448
3449         free_opal_dev(sdkp->opal_dev);
3450
3451         blk_register_region(devt, SD_MINORS, NULL,
3452                             sd_default_probe, NULL, NULL);
3453
3454         mutex_lock(&sd_ref_mutex);
3455         dev_set_drvdata(dev, NULL);
3456         put_device(&sdkp->dev);
3457         mutex_unlock(&sd_ref_mutex);
3458
3459         return 0;
3460 }
3461
3462 /**
3463  *      scsi_disk_release - Called to free the scsi_disk structure
3464  *      @dev: pointer to embedded class device
3465  *
3466  *      sd_ref_mutex must be held entering this routine.  Because it is
3467  *      called on last put, you should always use the scsi_disk_get()
3468  *      scsi_disk_put() helpers which manipulate the semaphore directly
3469  *      and never do a direct put_device.
3470  **/
3471 static void scsi_disk_release(struct device *dev)
3472 {
3473         struct scsi_disk *sdkp = to_scsi_disk(dev);
3474         struct gendisk *disk = sdkp->disk;
3475         struct request_queue *q = disk->queue;
3476
3477         ida_free(&sd_index_ida, sdkp->index);
3478
3479         /*
3480          * Wait until all requests that are in progress have completed.
3481          * This is necessary to avoid that e.g. scsi_end_request() crashes
3482          * due to clearing the disk->private_data pointer. Wait from inside
3483          * scsi_disk_release() instead of from sd_release() to avoid that
3484          * freezing and unfreezing the request queue affects user space I/O
3485          * in case multiple processes open a /dev/sd... node concurrently.
3486          */
3487         blk_mq_freeze_queue(q);
3488         blk_mq_unfreeze_queue(q);
3489
3490         disk->private_data = NULL;
3491         put_disk(disk);
3492         put_device(&sdkp->device->sdev_gendev);
3493
3494         kfree(sdkp);
3495 }
3496
3497 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3498 {
3499         unsigned char cmd[6] = { START_STOP };  /* START_VALID */
3500         struct scsi_sense_hdr sshdr;
3501         struct scsi_device *sdp = sdkp->device;
3502         int res;
3503
3504         if (start)
3505                 cmd[4] |= 1;    /* START */
3506
3507         if (sdp->start_stop_pwr_cond)
3508                 cmd[4] |= start ? 1 << 4 : 3 << 4;      /* Active or Standby */
3509
3510         if (!scsi_device_online(sdp))
3511                 return -ENODEV;
3512
3513         res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3514                         SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3515         if (res) {
3516                 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3517                 if (driver_byte(res) == DRIVER_SENSE)
3518                         sd_print_sense_hdr(sdkp, &sshdr);
3519                 if (scsi_sense_valid(&sshdr) &&
3520                         /* 0x3a is medium not present */
3521                         sshdr.asc == 0x3a)
3522                         res = 0;
3523         }
3524
3525         /* SCSI error codes must not go to the generic layer */
3526         if (res)
3527                 return -EIO;
3528
3529         return 0;
3530 }
3531
3532 /*
3533  * Send a SYNCHRONIZE CACHE instruction down to the device through
3534  * the normal SCSI command structure.  Wait for the command to
3535  * complete.
3536  */
3537 static void sd_shutdown(struct device *dev)
3538 {
3539         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3540
3541         if (!sdkp)
3542                 return;         /* this can happen */
3543
3544         if (pm_runtime_suspended(dev))
3545                 return;
3546
3547         if (sdkp->WCE && sdkp->media_present) {
3548                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3549                 sd_sync_cache(sdkp, NULL);
3550         }
3551
3552         if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3553                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3554                 sd_start_stop_device(sdkp, 0);
3555         }
3556 }
3557
3558 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3559 {
3560         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3561         struct scsi_sense_hdr sshdr;
3562         int ret = 0;
3563
3564         if (!sdkp)      /* E.g.: runtime suspend following sd_remove() */
3565                 return 0;
3566
3567         if (sdkp->WCE && sdkp->media_present) {
3568                 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3569                 ret = sd_sync_cache(sdkp, &sshdr);
3570
3571                 if (ret) {
3572                         /* ignore OFFLINE device */
3573                         if (ret == -ENODEV)
3574                                 return 0;
3575
3576                         if (!scsi_sense_valid(&sshdr) ||
3577                             sshdr.sense_key != ILLEGAL_REQUEST)
3578                                 return ret;
3579
3580                         /*
3581                          * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3582                          * doesn't support sync. There's not much to do and
3583                          * suspend shouldn't fail.
3584                          */
3585                         ret = 0;
3586                 }
3587         }
3588
3589         if (sdkp->device->manage_start_stop) {
3590                 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3591                 /* an error is not worth aborting a system sleep */
3592                 ret = sd_start_stop_device(sdkp, 0);
3593                 if (ignore_stop_errors)
3594                         ret = 0;
3595         }
3596
3597         return ret;
3598 }
3599
3600 static int sd_suspend_system(struct device *dev)
3601 {
3602         return sd_suspend_common(dev, true);
3603 }
3604
3605 static int sd_suspend_runtime(struct device *dev)
3606 {
3607         return sd_suspend_common(dev, false);
3608 }
3609
3610 static int sd_resume(struct device *dev)
3611 {
3612         struct scsi_disk *sdkp = dev_get_drvdata(dev);
3613         int ret;
3614
3615         if (!sdkp)      /* E.g.: runtime resume at the start of sd_probe() */
3616                 return 0;
3617
3618         if (!sdkp->device->manage_start_stop)
3619                 return 0;
3620
3621         sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3622         ret = sd_start_stop_device(sdkp, 1);
3623         if (!ret)
3624                 opal_unlock_from_suspend(sdkp->opal_dev);
3625         return ret;
3626 }
3627
3628 /**
3629  *      init_sd - entry point for this driver (both when built in or when
3630  *      a module).
3631  *
3632  *      Note: this function registers this driver with the scsi mid-level.
3633  **/
3634 static int __init init_sd(void)
3635 {
3636         int majors = 0, i, err;
3637
3638         SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3639
3640         for (i = 0; i < SD_MAJORS; i++) {
3641                 if (register_blkdev(sd_major(i), "sd") != 0)
3642                         continue;
3643                 majors++;
3644                 blk_register_region(sd_major(i), SD_MINORS, NULL,
3645                                     sd_default_probe, NULL, NULL);
3646         }
3647
3648         if (!majors)
3649                 return -ENODEV;
3650
3651         err = class_register(&sd_disk_class);
3652         if (err)
3653                 goto err_out;
3654
3655         sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3656                                          0, 0, NULL);
3657         if (!sd_cdb_cache) {
3658                 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3659                 err = -ENOMEM;
3660                 goto err_out_class;
3661         }
3662
3663         sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3664         if (!sd_cdb_pool) {
3665                 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3666                 err = -ENOMEM;
3667                 goto err_out_cache;
3668         }
3669
3670         sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
3671         if (!sd_page_pool) {
3672                 printk(KERN_ERR "sd: can't init discard page pool\n");
3673                 err = -ENOMEM;
3674                 goto err_out_ppool;
3675         }
3676
3677         err = scsi_register_driver(&sd_template.gendrv);
3678         if (err)
3679                 goto err_out_driver;
3680
3681         return 0;
3682
3683 err_out_driver:
3684         mempool_destroy(sd_page_pool);
3685
3686 err_out_ppool:
3687         mempool_destroy(sd_cdb_pool);
3688
3689 err_out_cache:
3690         kmem_cache_destroy(sd_cdb_cache);
3691
3692 err_out_class:
3693         class_unregister(&sd_disk_class);
3694 err_out:
3695         for (i = 0; i < SD_MAJORS; i++)
3696                 unregister_blkdev(sd_major(i), "sd");
3697         return err;
3698 }
3699
3700 /**
3701  *      exit_sd - exit point for this driver (when it is a module).
3702  *
3703  *      Note: this function unregisters this driver from the scsi mid-level.
3704  **/
3705 static void __exit exit_sd(void)
3706 {
3707         int i;
3708
3709         SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3710
3711         scsi_unregister_driver(&sd_template.gendrv);
3712         mempool_destroy(sd_cdb_pool);
3713         mempool_destroy(sd_page_pool);
3714         kmem_cache_destroy(sd_cdb_cache);
3715
3716         class_unregister(&sd_disk_class);
3717
3718         for (i = 0; i < SD_MAJORS; i++) {
3719                 blk_unregister_region(sd_major(i), SD_MINORS);
3720                 unregister_blkdev(sd_major(i), "sd");
3721         }
3722 }
3723
3724 module_init(init_sd);
3725 module_exit(exit_sd);
3726
3727 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
3728 {
3729         scsi_print_sense_hdr(sdkp->device,
3730                              sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3731 }
3732
3733 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result)
3734 {
3735         const char *hb_string = scsi_hostbyte_string(result);
3736         const char *db_string = scsi_driverbyte_string(result);
3737
3738         if (hb_string || db_string)
3739                 sd_printk(KERN_INFO, sdkp,
3740                           "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3741                           hb_string ? hb_string : "invalid",
3742                           db_string ? db_string : "invalid");
3743         else
3744                 sd_printk(KERN_INFO, sdkp,
3745                           "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3746                           msg, host_byte(result), driver_byte(result));
3747 }