drivers/scsi/sd.c

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