1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sd.c Copyright (C) 1992 Drew Eckhardt 4 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 5 * 6 * Linux scsi disk driver 7 * Initial versions: Drew Eckhardt 8 * Subsequent revisions: Eric Youngdale 9 * Modification history: 10 * - Drew Eckhardt <drew@colorado.edu> original 11 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 12 * outstanding request, and other enhancements. 13 * Support loadable low-level scsi drivers. 14 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 15 * eight major numbers. 16 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. 17 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 18 * sd_init and cleanups. 19 * - Alex Davis <letmein@erols.com> Fix problem where partition info 20 * not being read in sd_open. Fix problem where removable media 21 * could be ejected after sd_open. 22 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x 23 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 24 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 25 * Support 32k/1M disks. 26 * 27 * Logging policy (needs CONFIG_SCSI_LOGGING defined): 28 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 29 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 30 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 31 * - entering other commands: SCSI_LOG_HLQUEUE level 3 32 * Note: when the logging level is set by the user, it must be greater 33 * than the level indicated above to trigger output. 34 */ 35 36 #include <linux/module.h> 37 #include <linux/fs.h> 38 #include <linux/kernel.h> 39 #include <linux/mm.h> 40 #include <linux/bio.h> 41 #include <linux/genhd.h> 42 #include <linux/hdreg.h> 43 #include <linux/errno.h> 44 #include <linux/idr.h> 45 #include <linux/interrupt.h> 46 #include <linux/init.h> 47 #include <linux/blkdev.h> 48 #include <linux/blkpg.h> 49 #include <linux/blk-pm.h> 50 #include <linux/delay.h> 51 #include <linux/mutex.h> 52 #include <linux/string_helpers.h> 53 #include <linux/async.h> 54 #include <linux/slab.h> 55 #include <linux/sed-opal.h> 56 #include <linux/pm_runtime.h> 57 #include <linux/pr.h> 58 #include <linux/t10-pi.h> 59 #include <linux/uaccess.h> 60 #include <asm/unaligned.h> 61 62 #include <scsi/scsi.h> 63 #include <scsi/scsi_cmnd.h> 64 #include <scsi/scsi_dbg.h> 65 #include <scsi/scsi_device.h> 66 #include <scsi/scsi_driver.h> 67 #include <scsi/scsi_eh.h> 68 #include <scsi/scsi_host.h> 69 #include <scsi/scsi_ioctl.h> 70 #include <scsi/scsicam.h> 71 72 #include "sd.h" 73 #include "scsi_priv.h" 74 #include "scsi_logging.h" 75 76 MODULE_AUTHOR("Eric Youngdale"); 77 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 78 MODULE_LICENSE("GPL"); 79 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 95 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 96 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 97 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 98 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 99 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC); 100 101 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 102 #define SD_MINORS 16 103 #else 104 #define SD_MINORS 0 105 #endif 106 107 static void sd_config_discard(struct scsi_disk *, unsigned int); 108 static void sd_config_write_same(struct scsi_disk *); 109 static int sd_revalidate_disk(struct gendisk *); 110 static void sd_unlock_native_capacity(struct gendisk *disk); 111 static int sd_probe(struct device *); 112 static int sd_remove(struct device *); 113 static void sd_shutdown(struct device *); 114 static int sd_suspend_system(struct device *); 115 static int sd_suspend_runtime(struct device *); 116 static int sd_resume(struct device *); 117 static void sd_rescan(struct device *); 118 static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt); 119 static void sd_uninit_command(struct scsi_cmnd *SCpnt); 120 static int sd_done(struct scsi_cmnd *); 121 static void sd_eh_reset(struct scsi_cmnd *); 122 static int sd_eh_action(struct scsi_cmnd *, int); 123 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 124 static void scsi_disk_release(struct device *cdev); 125 126 static DEFINE_IDA(sd_index_ida); 127 128 /* This semaphore is used to mediate the 0->1 reference get in the 129 * face of object destruction (i.e. we can't allow a get on an 130 * object after last put) */ 131 static DEFINE_MUTEX(sd_ref_mutex); 132 133 static struct kmem_cache *sd_cdb_cache; 134 static mempool_t *sd_cdb_pool; 135 static mempool_t *sd_page_pool; 136 137 static const char *sd_cache_types[] = { 138 "write through", "none", "write back", 139 "write back, no read (daft)" 140 }; 141 142 static void sd_set_flush_flag(struct scsi_disk *sdkp) 143 { 144 bool wc = false, fua = false; 145 146 if (sdkp->WCE) { 147 wc = true; 148 if (sdkp->DPOFUA) 149 fua = true; 150 } 151 152 blk_queue_write_cache(sdkp->disk->queue, wc, fua); 153 } 154 155 static ssize_t 156 cache_type_store(struct device *dev, struct device_attribute *attr, 157 const char *buf, size_t count) 158 { 159 int ct, rcd, wce, sp; 160 struct scsi_disk *sdkp = to_scsi_disk(dev); 161 struct scsi_device *sdp = sdkp->device; 162 char buffer[64]; 163 char *buffer_data; 164 struct scsi_mode_data data; 165 struct scsi_sense_hdr sshdr; 166 static const char temp[] = "temporary "; 167 int len; 168 169 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 170 /* no cache control on RBC devices; theoretically they 171 * can do it, but there's probably so many exceptions 172 * it's not worth the risk */ 173 return -EINVAL; 174 175 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { 176 buf += sizeof(temp) - 1; 177 sdkp->cache_override = 1; 178 } else { 179 sdkp->cache_override = 0; 180 } 181 182 ct = sysfs_match_string(sd_cache_types, buf); 183 if (ct < 0) 184 return -EINVAL; 185 186 rcd = ct & 0x01 ? 1 : 0; 187 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0; 188 189 if (sdkp->cache_override) { 190 sdkp->WCE = wce; 191 sdkp->RCD = rcd; 192 sd_set_flush_flag(sdkp); 193 return count; 194 } 195 196 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 197 sdkp->max_retries, &data, NULL)) 198 return -EINVAL; 199 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 200 data.block_descriptor_length); 201 buffer_data = buffer + data.header_length + 202 data.block_descriptor_length; 203 buffer_data[2] &= ~0x05; 204 buffer_data[2] |= wce << 2 | rcd; 205 sp = buffer_data[0] & 0x80 ? 1 : 0; 206 buffer_data[0] &= ~0x80; 207 208 /* 209 * Ensure WP, DPOFUA, and RESERVED fields are cleared in 210 * received mode parameter buffer before doing MODE SELECT. 211 */ 212 data.device_specific = 0; 213 214 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 215 sdkp->max_retries, &data, &sshdr)) { 216 if (scsi_sense_valid(&sshdr)) 217 sd_print_sense_hdr(sdkp, &sshdr); 218 return -EINVAL; 219 } 220 sd_revalidate_disk(sdkp->disk); 221 return count; 222 } 223 224 static ssize_t 225 manage_start_stop_show(struct device *dev, struct device_attribute *attr, 226 char *buf) 227 { 228 struct scsi_disk *sdkp = to_scsi_disk(dev); 229 struct scsi_device *sdp = sdkp->device; 230 231 return sprintf(buf, "%u\n", sdp->manage_start_stop); 232 } 233 234 static ssize_t 235 manage_start_stop_store(struct device *dev, struct device_attribute *attr, 236 const char *buf, size_t count) 237 { 238 struct scsi_disk *sdkp = to_scsi_disk(dev); 239 struct scsi_device *sdp = sdkp->device; 240 bool v; 241 242 if (!capable(CAP_SYS_ADMIN)) 243 return -EACCES; 244 245 if (kstrtobool(buf, &v)) 246 return -EINVAL; 247 248 sdp->manage_start_stop = v; 249 250 return count; 251 } 252 static DEVICE_ATTR_RW(manage_start_stop); 253 254 static ssize_t 255 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf) 256 { 257 struct scsi_disk *sdkp = to_scsi_disk(dev); 258 259 return sprintf(buf, "%u\n", sdkp->device->allow_restart); 260 } 261 262 static ssize_t 263 allow_restart_store(struct device *dev, struct device_attribute *attr, 264 const char *buf, size_t count) 265 { 266 bool v; 267 struct scsi_disk *sdkp = to_scsi_disk(dev); 268 struct scsi_device *sdp = sdkp->device; 269 270 if (!capable(CAP_SYS_ADMIN)) 271 return -EACCES; 272 273 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 274 return -EINVAL; 275 276 if (kstrtobool(buf, &v)) 277 return -EINVAL; 278 279 sdp->allow_restart = v; 280 281 return count; 282 } 283 static DEVICE_ATTR_RW(allow_restart); 284 285 static ssize_t 286 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) 287 { 288 struct scsi_disk *sdkp = to_scsi_disk(dev); 289 int ct = sdkp->RCD + 2*sdkp->WCE; 290 291 return sprintf(buf, "%s\n", sd_cache_types[ct]); 292 } 293 static DEVICE_ATTR_RW(cache_type); 294 295 static ssize_t 296 FUA_show(struct device *dev, struct device_attribute *attr, char *buf) 297 { 298 struct scsi_disk *sdkp = to_scsi_disk(dev); 299 300 return sprintf(buf, "%u\n", sdkp->DPOFUA); 301 } 302 static DEVICE_ATTR_RO(FUA); 303 304 static ssize_t 305 protection_type_show(struct device *dev, struct device_attribute *attr, 306 char *buf) 307 { 308 struct scsi_disk *sdkp = to_scsi_disk(dev); 309 310 return sprintf(buf, "%u\n", sdkp->protection_type); 311 } 312 313 static ssize_t 314 protection_type_store(struct device *dev, struct device_attribute *attr, 315 const char *buf, size_t count) 316 { 317 struct scsi_disk *sdkp = to_scsi_disk(dev); 318 unsigned int val; 319 int err; 320 321 if (!capable(CAP_SYS_ADMIN)) 322 return -EACCES; 323 324 err = kstrtouint(buf, 10, &val); 325 326 if (err) 327 return err; 328 329 if (val <= T10_PI_TYPE3_PROTECTION) 330 sdkp->protection_type = val; 331 332 return count; 333 } 334 static DEVICE_ATTR_RW(protection_type); 335 336 static ssize_t 337 protection_mode_show(struct device *dev, struct device_attribute *attr, 338 char *buf) 339 { 340 struct scsi_disk *sdkp = to_scsi_disk(dev); 341 struct scsi_device *sdp = sdkp->device; 342 unsigned int dif, dix; 343 344 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 345 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); 346 347 if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) { 348 dif = 0; 349 dix = 1; 350 } 351 352 if (!dif && !dix) 353 return sprintf(buf, "none\n"); 354 355 return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif); 356 } 357 static DEVICE_ATTR_RO(protection_mode); 358 359 static ssize_t 360 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf) 361 { 362 struct scsi_disk *sdkp = to_scsi_disk(dev); 363 364 return sprintf(buf, "%u\n", sdkp->ATO); 365 } 366 static DEVICE_ATTR_RO(app_tag_own); 367 368 static ssize_t 369 thin_provisioning_show(struct device *dev, struct device_attribute *attr, 370 char *buf) 371 { 372 struct scsi_disk *sdkp = to_scsi_disk(dev); 373 374 return sprintf(buf, "%u\n", sdkp->lbpme); 375 } 376 static DEVICE_ATTR_RO(thin_provisioning); 377 378 /* sysfs_match_string() requires dense arrays */ 379 static const char *lbp_mode[] = { 380 [SD_LBP_FULL] = "full", 381 [SD_LBP_UNMAP] = "unmap", 382 [SD_LBP_WS16] = "writesame_16", 383 [SD_LBP_WS10] = "writesame_10", 384 [SD_LBP_ZERO] = "writesame_zero", 385 [SD_LBP_DISABLE] = "disabled", 386 }; 387 388 static ssize_t 389 provisioning_mode_show(struct device *dev, struct device_attribute *attr, 390 char *buf) 391 { 392 struct scsi_disk *sdkp = to_scsi_disk(dev); 393 394 return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]); 395 } 396 397 static ssize_t 398 provisioning_mode_store(struct device *dev, struct device_attribute *attr, 399 const char *buf, size_t count) 400 { 401 struct scsi_disk *sdkp = to_scsi_disk(dev); 402 struct scsi_device *sdp = sdkp->device; 403 int mode; 404 405 if (!capable(CAP_SYS_ADMIN)) 406 return -EACCES; 407 408 if (sd_is_zoned(sdkp)) { 409 sd_config_discard(sdkp, SD_LBP_DISABLE); 410 return count; 411 } 412 413 if (sdp->type != TYPE_DISK) 414 return -EINVAL; 415 416 mode = sysfs_match_string(lbp_mode, buf); 417 if (mode < 0) 418 return -EINVAL; 419 420 sd_config_discard(sdkp, mode); 421 422 return count; 423 } 424 static DEVICE_ATTR_RW(provisioning_mode); 425 426 /* sysfs_match_string() requires dense arrays */ 427 static const char *zeroing_mode[] = { 428 [SD_ZERO_WRITE] = "write", 429 [SD_ZERO_WS] = "writesame", 430 [SD_ZERO_WS16_UNMAP] = "writesame_16_unmap", 431 [SD_ZERO_WS10_UNMAP] = "writesame_10_unmap", 432 }; 433 434 static ssize_t 435 zeroing_mode_show(struct device *dev, struct device_attribute *attr, 436 char *buf) 437 { 438 struct scsi_disk *sdkp = to_scsi_disk(dev); 439 440 return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]); 441 } 442 443 static ssize_t 444 zeroing_mode_store(struct device *dev, struct device_attribute *attr, 445 const char *buf, size_t count) 446 { 447 struct scsi_disk *sdkp = to_scsi_disk(dev); 448 int mode; 449 450 if (!capable(CAP_SYS_ADMIN)) 451 return -EACCES; 452 453 mode = sysfs_match_string(zeroing_mode, buf); 454 if (mode < 0) 455 return -EINVAL; 456 457 sdkp->zeroing_mode = mode; 458 459 return count; 460 } 461 static DEVICE_ATTR_RW(zeroing_mode); 462 463 static ssize_t 464 max_medium_access_timeouts_show(struct device *dev, 465 struct device_attribute *attr, char *buf) 466 { 467 struct scsi_disk *sdkp = to_scsi_disk(dev); 468 469 return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts); 470 } 471 472 static ssize_t 473 max_medium_access_timeouts_store(struct device *dev, 474 struct device_attribute *attr, const char *buf, 475 size_t count) 476 { 477 struct scsi_disk *sdkp = to_scsi_disk(dev); 478 int err; 479 480 if (!capable(CAP_SYS_ADMIN)) 481 return -EACCES; 482 483 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); 484 485 return err ? err : count; 486 } 487 static DEVICE_ATTR_RW(max_medium_access_timeouts); 488 489 static ssize_t 490 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr, 491 char *buf) 492 { 493 struct scsi_disk *sdkp = to_scsi_disk(dev); 494 495 return sprintf(buf, "%u\n", sdkp->max_ws_blocks); 496 } 497 498 static ssize_t 499 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr, 500 const char *buf, size_t count) 501 { 502 struct scsi_disk *sdkp = to_scsi_disk(dev); 503 struct scsi_device *sdp = sdkp->device; 504 unsigned long max; 505 int err; 506 507 if (!capable(CAP_SYS_ADMIN)) 508 return -EACCES; 509 510 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 511 return -EINVAL; 512 513 err = kstrtoul(buf, 10, &max); 514 515 if (err) 516 return err; 517 518 if (max == 0) 519 sdp->no_write_same = 1; 520 else if (max <= SD_MAX_WS16_BLOCKS) { 521 sdp->no_write_same = 0; 522 sdkp->max_ws_blocks = max; 523 } 524 525 sd_config_write_same(sdkp); 526 527 return count; 528 } 529 static DEVICE_ATTR_RW(max_write_same_blocks); 530 531 static ssize_t 532 zoned_cap_show(struct device *dev, struct device_attribute *attr, char *buf) 533 { 534 struct scsi_disk *sdkp = to_scsi_disk(dev); 535 536 if (sdkp->device->type == TYPE_ZBC) 537 return sprintf(buf, "host-managed\n"); 538 if (sdkp->zoned == 1) 539 return sprintf(buf, "host-aware\n"); 540 if (sdkp->zoned == 2) 541 return sprintf(buf, "drive-managed\n"); 542 return sprintf(buf, "none\n"); 543 } 544 static DEVICE_ATTR_RO(zoned_cap); 545 546 static ssize_t 547 max_retries_store(struct device *dev, struct device_attribute *attr, 548 const char *buf, size_t count) 549 { 550 struct scsi_disk *sdkp = to_scsi_disk(dev); 551 struct scsi_device *sdev = sdkp->device; 552 int retries, err; 553 554 err = kstrtoint(buf, 10, &retries); 555 if (err) 556 return err; 557 558 if (retries == SCSI_CMD_RETRIES_NO_LIMIT || retries <= SD_MAX_RETRIES) { 559 sdkp->max_retries = retries; 560 return count; 561 } 562 563 sdev_printk(KERN_ERR, sdev, "max_retries must be between -1 and %d\n", 564 SD_MAX_RETRIES); 565 return -EINVAL; 566 } 567 568 static ssize_t 569 max_retries_show(struct device *dev, struct device_attribute *attr, 570 char *buf) 571 { 572 struct scsi_disk *sdkp = to_scsi_disk(dev); 573 574 return sprintf(buf, "%d\n", sdkp->max_retries); 575 } 576 577 static DEVICE_ATTR_RW(max_retries); 578 579 static struct attribute *sd_disk_attrs[] = { 580 &dev_attr_cache_type.attr, 581 &dev_attr_FUA.attr, 582 &dev_attr_allow_restart.attr, 583 &dev_attr_manage_start_stop.attr, 584 &dev_attr_protection_type.attr, 585 &dev_attr_protection_mode.attr, 586 &dev_attr_app_tag_own.attr, 587 &dev_attr_thin_provisioning.attr, 588 &dev_attr_provisioning_mode.attr, 589 &dev_attr_zeroing_mode.attr, 590 &dev_attr_max_write_same_blocks.attr, 591 &dev_attr_max_medium_access_timeouts.attr, 592 &dev_attr_zoned_cap.attr, 593 &dev_attr_max_retries.attr, 594 NULL, 595 }; 596 ATTRIBUTE_GROUPS(sd_disk); 597 598 static struct class sd_disk_class = { 599 .name = "scsi_disk", 600 .owner = THIS_MODULE, 601 .dev_release = scsi_disk_release, 602 .dev_groups = sd_disk_groups, 603 }; 604 605 static const struct dev_pm_ops sd_pm_ops = { 606 .suspend = sd_suspend_system, 607 .resume = sd_resume, 608 .poweroff = sd_suspend_system, 609 .restore = sd_resume, 610 .runtime_suspend = sd_suspend_runtime, 611 .runtime_resume = sd_resume, 612 }; 613 614 static struct scsi_driver sd_template = { 615 .gendrv = { 616 .name = "sd", 617 .owner = THIS_MODULE, 618 .probe = sd_probe, 619 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 620 .remove = sd_remove, 621 .shutdown = sd_shutdown, 622 .pm = &sd_pm_ops, 623 }, 624 .rescan = sd_rescan, 625 .init_command = sd_init_command, 626 .uninit_command = sd_uninit_command, 627 .done = sd_done, 628 .eh_action = sd_eh_action, 629 .eh_reset = sd_eh_reset, 630 }; 631 632 /* 633 * Don't request a new module, as that could deadlock in multipath 634 * environment. 635 */ 636 static void sd_default_probe(dev_t devt) 637 { 638 } 639 640 /* 641 * Device no to disk mapping: 642 * 643 * major disc2 disc p1 644 * |............|.............|....|....| <- dev_t 645 * 31 20 19 8 7 4 3 0 646 * 647 * Inside a major, we have 16k disks, however mapped non- 648 * contiguously. The first 16 disks are for major0, the next 649 * ones with major1, ... Disk 256 is for major0 again, disk 272 650 * for major1, ... 651 * As we stay compatible with our numbering scheme, we can reuse 652 * the well-know SCSI majors 8, 65--71, 136--143. 653 */ 654 static int sd_major(int major_idx) 655 { 656 switch (major_idx) { 657 case 0: 658 return SCSI_DISK0_MAJOR; 659 case 1 ... 7: 660 return SCSI_DISK1_MAJOR + major_idx - 1; 661 case 8 ... 15: 662 return SCSI_DISK8_MAJOR + major_idx - 8; 663 default: 664 BUG(); 665 return 0; /* shut up gcc */ 666 } 667 } 668 669 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 670 { 671 struct scsi_disk *sdkp = NULL; 672 673 mutex_lock(&sd_ref_mutex); 674 675 if (disk->private_data) { 676 sdkp = scsi_disk(disk); 677 if (scsi_device_get(sdkp->device) == 0) 678 get_device(&sdkp->dev); 679 else 680 sdkp = NULL; 681 } 682 mutex_unlock(&sd_ref_mutex); 683 return sdkp; 684 } 685 686 static void scsi_disk_put(struct scsi_disk *sdkp) 687 { 688 struct scsi_device *sdev = sdkp->device; 689 690 mutex_lock(&sd_ref_mutex); 691 put_device(&sdkp->dev); 692 scsi_device_put(sdev); 693 mutex_unlock(&sd_ref_mutex); 694 } 695 696 #ifdef CONFIG_BLK_SED_OPAL 697 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, 698 size_t len, bool send) 699 { 700 struct scsi_disk *sdkp = data; 701 struct scsi_device *sdev = sdkp->device; 702 u8 cdb[12] = { 0, }; 703 int ret; 704 705 cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN; 706 cdb[1] = secp; 707 put_unaligned_be16(spsp, &cdb[2]); 708 put_unaligned_be32(len, &cdb[6]); 709 710 ret = scsi_execute(sdev, cdb, send ? DMA_TO_DEVICE : DMA_FROM_DEVICE, 711 buffer, len, NULL, NULL, SD_TIMEOUT, sdkp->max_retries, 0, 712 RQF_PM, NULL); 713 return ret <= 0 ? ret : -EIO; 714 } 715 #endif /* CONFIG_BLK_SED_OPAL */ 716 717 /* 718 * Look up the DIX operation based on whether the command is read or 719 * write and whether dix and dif are enabled. 720 */ 721 static unsigned int sd_prot_op(bool write, bool dix, bool dif) 722 { 723 /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */ 724 static const unsigned int ops[] = { /* wrt dix dif */ 725 SCSI_PROT_NORMAL, /* 0 0 0 */ 726 SCSI_PROT_READ_STRIP, /* 0 0 1 */ 727 SCSI_PROT_READ_INSERT, /* 0 1 0 */ 728 SCSI_PROT_READ_PASS, /* 0 1 1 */ 729 SCSI_PROT_NORMAL, /* 1 0 0 */ 730 SCSI_PROT_WRITE_INSERT, /* 1 0 1 */ 731 SCSI_PROT_WRITE_STRIP, /* 1 1 0 */ 732 SCSI_PROT_WRITE_PASS, /* 1 1 1 */ 733 }; 734 735 return ops[write << 2 | dix << 1 | dif]; 736 } 737 738 /* 739 * Returns a mask of the protection flags that are valid for a given DIX 740 * operation. 741 */ 742 static unsigned int sd_prot_flag_mask(unsigned int prot_op) 743 { 744 static const unsigned int flag_mask[] = { 745 [SCSI_PROT_NORMAL] = 0, 746 747 [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI | 748 SCSI_PROT_GUARD_CHECK | 749 SCSI_PROT_REF_CHECK | 750 SCSI_PROT_REF_INCREMENT, 751 752 [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT | 753 SCSI_PROT_IP_CHECKSUM, 754 755 [SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI | 756 SCSI_PROT_GUARD_CHECK | 757 SCSI_PROT_REF_CHECK | 758 SCSI_PROT_REF_INCREMENT | 759 SCSI_PROT_IP_CHECKSUM, 760 761 [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI | 762 SCSI_PROT_REF_INCREMENT, 763 764 [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK | 765 SCSI_PROT_REF_CHECK | 766 SCSI_PROT_REF_INCREMENT | 767 SCSI_PROT_IP_CHECKSUM, 768 769 [SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI | 770 SCSI_PROT_GUARD_CHECK | 771 SCSI_PROT_REF_CHECK | 772 SCSI_PROT_REF_INCREMENT | 773 SCSI_PROT_IP_CHECKSUM, 774 }; 775 776 return flag_mask[prot_op]; 777 } 778 779 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd, 780 unsigned int dix, unsigned int dif) 781 { 782 struct bio *bio = scmd->request->bio; 783 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif); 784 unsigned int protect = 0; 785 786 if (dix) { /* DIX Type 0, 1, 2, 3 */ 787 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM)) 788 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM; 789 790 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 791 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK; 792 } 793 794 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */ 795 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT; 796 797 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 798 scmd->prot_flags |= SCSI_PROT_REF_CHECK; 799 } 800 801 if (dif) { /* DIX/DIF Type 1, 2, 3 */ 802 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI; 803 804 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK)) 805 protect = 3 << 5; /* Disable target PI checking */ 806 else 807 protect = 1 << 5; /* Enable target PI checking */ 808 } 809 810 scsi_set_prot_op(scmd, prot_op); 811 scsi_set_prot_type(scmd, dif); 812 scmd->prot_flags &= sd_prot_flag_mask(prot_op); 813 814 return protect; 815 } 816 817 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) 818 { 819 struct request_queue *q = sdkp->disk->queue; 820 unsigned int logical_block_size = sdkp->device->sector_size; 821 unsigned int max_blocks = 0; 822 823 q->limits.discard_alignment = 824 sdkp->unmap_alignment * logical_block_size; 825 q->limits.discard_granularity = 826 max(sdkp->physical_block_size, 827 sdkp->unmap_granularity * logical_block_size); 828 sdkp->provisioning_mode = mode; 829 830 switch (mode) { 831 832 case SD_LBP_FULL: 833 case SD_LBP_DISABLE: 834 blk_queue_max_discard_sectors(q, 0); 835 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q); 836 return; 837 838 case SD_LBP_UNMAP: 839 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 840 (u32)SD_MAX_WS16_BLOCKS); 841 break; 842 843 case SD_LBP_WS16: 844 if (sdkp->device->unmap_limit_for_ws) 845 max_blocks = sdkp->max_unmap_blocks; 846 else 847 max_blocks = sdkp->max_ws_blocks; 848 849 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS); 850 break; 851 852 case SD_LBP_WS10: 853 if (sdkp->device->unmap_limit_for_ws) 854 max_blocks = sdkp->max_unmap_blocks; 855 else 856 max_blocks = sdkp->max_ws_blocks; 857 858 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS); 859 break; 860 861 case SD_LBP_ZERO: 862 max_blocks = min_not_zero(sdkp->max_ws_blocks, 863 (u32)SD_MAX_WS10_BLOCKS); 864 break; 865 } 866 867 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9)); 868 blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); 869 } 870 871 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd) 872 { 873 struct scsi_device *sdp = cmd->device; 874 struct request *rq = cmd->request; 875 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 876 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 877 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 878 unsigned int data_len = 24; 879 char *buf; 880 881 rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC); 882 if (!rq->special_vec.bv_page) 883 return BLK_STS_RESOURCE; 884 clear_highpage(rq->special_vec.bv_page); 885 rq->special_vec.bv_offset = 0; 886 rq->special_vec.bv_len = data_len; 887 rq->rq_flags |= RQF_SPECIAL_PAYLOAD; 888 889 cmd->cmd_len = 10; 890 cmd->cmnd[0] = UNMAP; 891 cmd->cmnd[8] = 24; 892 893 buf = page_address(rq->special_vec.bv_page); 894 put_unaligned_be16(6 + 16, &buf[0]); 895 put_unaligned_be16(16, &buf[2]); 896 put_unaligned_be64(lba, &buf[8]); 897 put_unaligned_be32(nr_blocks, &buf[16]); 898 899 cmd->allowed = sdkp->max_retries; 900 cmd->transfersize = data_len; 901 rq->timeout = SD_TIMEOUT; 902 903 return scsi_alloc_sgtables(cmd); 904 } 905 906 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, 907 bool unmap) 908 { 909 struct scsi_device *sdp = cmd->device; 910 struct request *rq = cmd->request; 911 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 912 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 913 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 914 u32 data_len = sdp->sector_size; 915 916 rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC); 917 if (!rq->special_vec.bv_page) 918 return BLK_STS_RESOURCE; 919 clear_highpage(rq->special_vec.bv_page); 920 rq->special_vec.bv_offset = 0; 921 rq->special_vec.bv_len = data_len; 922 rq->rq_flags |= RQF_SPECIAL_PAYLOAD; 923 924 cmd->cmd_len = 16; 925 cmd->cmnd[0] = WRITE_SAME_16; 926 if (unmap) 927 cmd->cmnd[1] = 0x8; /* UNMAP */ 928 put_unaligned_be64(lba, &cmd->cmnd[2]); 929 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]); 930 931 cmd->allowed = sdkp->max_retries; 932 cmd->transfersize = data_len; 933 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT; 934 935 return scsi_alloc_sgtables(cmd); 936 } 937 938 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, 939 bool unmap) 940 { 941 struct scsi_device *sdp = cmd->device; 942 struct request *rq = cmd->request; 943 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 944 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 945 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 946 u32 data_len = sdp->sector_size; 947 948 rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC); 949 if (!rq->special_vec.bv_page) 950 return BLK_STS_RESOURCE; 951 clear_highpage(rq->special_vec.bv_page); 952 rq->special_vec.bv_offset = 0; 953 rq->special_vec.bv_len = data_len; 954 rq->rq_flags |= RQF_SPECIAL_PAYLOAD; 955 956 cmd->cmd_len = 10; 957 cmd->cmnd[0] = WRITE_SAME; 958 if (unmap) 959 cmd->cmnd[1] = 0x8; /* UNMAP */ 960 put_unaligned_be32(lba, &cmd->cmnd[2]); 961 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]); 962 963 cmd->allowed = sdkp->max_retries; 964 cmd->transfersize = data_len; 965 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT; 966 967 return scsi_alloc_sgtables(cmd); 968 } 969 970 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd) 971 { 972 struct request *rq = cmd->request; 973 struct scsi_device *sdp = cmd->device; 974 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 975 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 976 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 977 978 if (!(rq->cmd_flags & REQ_NOUNMAP)) { 979 switch (sdkp->zeroing_mode) { 980 case SD_ZERO_WS16_UNMAP: 981 return sd_setup_write_same16_cmnd(cmd, true); 982 case SD_ZERO_WS10_UNMAP: 983 return sd_setup_write_same10_cmnd(cmd, true); 984 } 985 } 986 987 if (sdp->no_write_same) { 988 rq->rq_flags |= RQF_QUIET; 989 return BLK_STS_TARGET; 990 } 991 992 if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) 993 return sd_setup_write_same16_cmnd(cmd, false); 994 995 return sd_setup_write_same10_cmnd(cmd, false); 996 } 997 998 static void sd_config_write_same(struct scsi_disk *sdkp) 999 { 1000 struct request_queue *q = sdkp->disk->queue; 1001 unsigned int logical_block_size = sdkp->device->sector_size; 1002 1003 if (sdkp->device->no_write_same) { 1004 sdkp->max_ws_blocks = 0; 1005 goto out; 1006 } 1007 1008 /* Some devices can not handle block counts above 0xffff despite 1009 * supporting WRITE SAME(16). Consequently we default to 64k 1010 * blocks per I/O unless the device explicitly advertises a 1011 * bigger limit. 1012 */ 1013 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) 1014 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 1015 (u32)SD_MAX_WS16_BLOCKS); 1016 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes) 1017 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 1018 (u32)SD_MAX_WS10_BLOCKS); 1019 else { 1020 sdkp->device->no_write_same = 1; 1021 sdkp->max_ws_blocks = 0; 1022 } 1023 1024 if (sdkp->lbprz && sdkp->lbpws) 1025 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP; 1026 else if (sdkp->lbprz && sdkp->lbpws10) 1027 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP; 1028 else if (sdkp->max_ws_blocks) 1029 sdkp->zeroing_mode = SD_ZERO_WS; 1030 else 1031 sdkp->zeroing_mode = SD_ZERO_WRITE; 1032 1033 if (sdkp->max_ws_blocks && 1034 sdkp->physical_block_size > logical_block_size) { 1035 /* 1036 * Reporting a maximum number of blocks that is not aligned 1037 * on the device physical size would cause a large write same 1038 * request to be split into physically unaligned chunks by 1039 * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same() 1040 * even if the caller of these functions took care to align the 1041 * large request. So make sure the maximum reported is aligned 1042 * to the device physical block size. This is only an optional 1043 * optimization for regular disks, but this is mandatory to 1044 * avoid failure of large write same requests directed at 1045 * sequential write required zones of host-managed ZBC disks. 1046 */ 1047 sdkp->max_ws_blocks = 1048 round_down(sdkp->max_ws_blocks, 1049 bytes_to_logical(sdkp->device, 1050 sdkp->physical_block_size)); 1051 } 1052 1053 out: 1054 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks * 1055 (logical_block_size >> 9)); 1056 blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks * 1057 (logical_block_size >> 9)); 1058 } 1059 1060 /** 1061 * sd_setup_write_same_cmnd - write the same data to multiple blocks 1062 * @cmd: command to prepare 1063 * 1064 * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on 1065 * the preference indicated by the target device. 1066 **/ 1067 static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd) 1068 { 1069 struct request *rq = cmd->request; 1070 struct scsi_device *sdp = cmd->device; 1071 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 1072 struct bio *bio = rq->bio; 1073 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 1074 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 1075 blk_status_t ret; 1076 1077 if (sdkp->device->no_write_same) 1078 return BLK_STS_TARGET; 1079 1080 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size); 1081 1082 rq->timeout = SD_WRITE_SAME_TIMEOUT; 1083 1084 if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) { 1085 cmd->cmd_len = 16; 1086 cmd->cmnd[0] = WRITE_SAME_16; 1087 put_unaligned_be64(lba, &cmd->cmnd[2]); 1088 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]); 1089 } else { 1090 cmd->cmd_len = 10; 1091 cmd->cmnd[0] = WRITE_SAME; 1092 put_unaligned_be32(lba, &cmd->cmnd[2]); 1093 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]); 1094 } 1095 1096 cmd->transfersize = sdp->sector_size; 1097 cmd->allowed = sdkp->max_retries; 1098 1099 /* 1100 * For WRITE SAME the data transferred via the DATA OUT buffer is 1101 * different from the amount of data actually written to the target. 1102 * 1103 * We set up __data_len to the amount of data transferred via the 1104 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list 1105 * to transfer a single sector of data first, but then reset it to 1106 * the amount of data to be written right after so that the I/O path 1107 * knows how much to actually write. 1108 */ 1109 rq->__data_len = sdp->sector_size; 1110 ret = scsi_alloc_sgtables(cmd); 1111 rq->__data_len = blk_rq_bytes(rq); 1112 1113 return ret; 1114 } 1115 1116 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd) 1117 { 1118 struct request *rq = cmd->request; 1119 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 1120 1121 /* flush requests don't perform I/O, zero the S/G table */ 1122 memset(&cmd->sdb, 0, sizeof(cmd->sdb)); 1123 1124 cmd->cmnd[0] = SYNCHRONIZE_CACHE; 1125 cmd->cmd_len = 10; 1126 cmd->transfersize = 0; 1127 cmd->allowed = sdkp->max_retries; 1128 1129 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER; 1130 return BLK_STS_OK; 1131 } 1132 1133 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write, 1134 sector_t lba, unsigned int nr_blocks, 1135 unsigned char flags) 1136 { 1137 cmd->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 1138 if (unlikely(cmd->cmnd == NULL)) 1139 return BLK_STS_RESOURCE; 1140 1141 cmd->cmd_len = SD_EXT_CDB_SIZE; 1142 memset(cmd->cmnd, 0, cmd->cmd_len); 1143 1144 cmd->cmnd[0] = VARIABLE_LENGTH_CMD; 1145 cmd->cmnd[7] = 0x18; /* Additional CDB len */ 1146 cmd->cmnd[9] = write ? WRITE_32 : READ_32; 1147 cmd->cmnd[10] = flags; 1148 put_unaligned_be64(lba, &cmd->cmnd[12]); 1149 put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */ 1150 put_unaligned_be32(nr_blocks, &cmd->cmnd[28]); 1151 1152 return BLK_STS_OK; 1153 } 1154 1155 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write, 1156 sector_t lba, unsigned int nr_blocks, 1157 unsigned char flags) 1158 { 1159 cmd->cmd_len = 16; 1160 cmd->cmnd[0] = write ? WRITE_16 : READ_16; 1161 cmd->cmnd[1] = flags; 1162 cmd->cmnd[14] = 0; 1163 cmd->cmnd[15] = 0; 1164 put_unaligned_be64(lba, &cmd->cmnd[2]); 1165 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]); 1166 1167 return BLK_STS_OK; 1168 } 1169 1170 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write, 1171 sector_t lba, unsigned int nr_blocks, 1172 unsigned char flags) 1173 { 1174 cmd->cmd_len = 10; 1175 cmd->cmnd[0] = write ? WRITE_10 : READ_10; 1176 cmd->cmnd[1] = flags; 1177 cmd->cmnd[6] = 0; 1178 cmd->cmnd[9] = 0; 1179 put_unaligned_be32(lba, &cmd->cmnd[2]); 1180 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]); 1181 1182 return BLK_STS_OK; 1183 } 1184 1185 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write, 1186 sector_t lba, unsigned int nr_blocks, 1187 unsigned char flags) 1188 { 1189 /* Avoid that 0 blocks gets translated into 256 blocks. */ 1190 if (WARN_ON_ONCE(nr_blocks == 0)) 1191 return BLK_STS_IOERR; 1192 1193 if (unlikely(flags & 0x8)) { 1194 /* 1195 * This happens only if this drive failed 10byte rw 1196 * command with ILLEGAL_REQUEST during operation and 1197 * thus turned off use_10_for_rw. 1198 */ 1199 scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n"); 1200 return BLK_STS_IOERR; 1201 } 1202 1203 cmd->cmd_len = 6; 1204 cmd->cmnd[0] = write ? WRITE_6 : READ_6; 1205 cmd->cmnd[1] = (lba >> 16) & 0x1f; 1206 cmd->cmnd[2] = (lba >> 8) & 0xff; 1207 cmd->cmnd[3] = lba & 0xff; 1208 cmd->cmnd[4] = nr_blocks; 1209 cmd->cmnd[5] = 0; 1210 1211 return BLK_STS_OK; 1212 } 1213 1214 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd) 1215 { 1216 struct request *rq = cmd->request; 1217 struct scsi_device *sdp = cmd->device; 1218 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 1219 sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 1220 sector_t threshold; 1221 unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 1222 unsigned int mask = logical_to_sectors(sdp, 1) - 1; 1223 bool write = rq_data_dir(rq) == WRITE; 1224 unsigned char protect, fua; 1225 blk_status_t ret; 1226 unsigned int dif; 1227 bool dix; 1228 1229 ret = scsi_alloc_sgtables(cmd); 1230 if (ret != BLK_STS_OK) 1231 return ret; 1232 1233 ret = BLK_STS_IOERR; 1234 if (!scsi_device_online(sdp) || sdp->changed) { 1235 scmd_printk(KERN_ERR, cmd, "device offline or changed\n"); 1236 goto fail; 1237 } 1238 1239 if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->rq_disk)) { 1240 scmd_printk(KERN_ERR, cmd, "access beyond end of device\n"); 1241 goto fail; 1242 } 1243 1244 if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) { 1245 scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n"); 1246 goto fail; 1247 } 1248 1249 /* 1250 * Some SD card readers can't handle accesses which touch the 1251 * last one or two logical blocks. Split accesses as needed. 1252 */ 1253 threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS; 1254 1255 if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) { 1256 if (lba < threshold) { 1257 /* Access up to the threshold but not beyond */ 1258 nr_blocks = threshold - lba; 1259 } else { 1260 /* Access only a single logical block */ 1261 nr_blocks = 1; 1262 } 1263 } 1264 1265 if (req_op(rq) == REQ_OP_ZONE_APPEND) { 1266 ret = sd_zbc_prepare_zone_append(cmd, &lba, nr_blocks); 1267 if (ret) 1268 goto fail; 1269 } 1270 1271 fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0; 1272 dix = scsi_prot_sg_count(cmd); 1273 dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type); 1274 1275 if (dif || dix) 1276 protect = sd_setup_protect_cmnd(cmd, dix, dif); 1277 else 1278 protect = 0; 1279 1280 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) { 1281 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks, 1282 protect | fua); 1283 } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) { 1284 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks, 1285 protect | fua); 1286 } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) || 1287 sdp->use_10_for_rw || protect) { 1288 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks, 1289 protect | fua); 1290 } else { 1291 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks, 1292 protect | fua); 1293 } 1294 1295 if (unlikely(ret != BLK_STS_OK)) 1296 goto fail; 1297 1298 /* 1299 * We shouldn't disconnect in the middle of a sector, so with a dumb 1300 * host adapter, it's safe to assume that we can at least transfer 1301 * this many bytes between each connect / disconnect. 1302 */ 1303 cmd->transfersize = sdp->sector_size; 1304 cmd->underflow = nr_blocks << 9; 1305 cmd->allowed = sdkp->max_retries; 1306 cmd->sdb.length = nr_blocks * sdp->sector_size; 1307 1308 SCSI_LOG_HLQUEUE(1, 1309 scmd_printk(KERN_INFO, cmd, 1310 "%s: block=%llu, count=%d\n", __func__, 1311 (unsigned long long)blk_rq_pos(rq), 1312 blk_rq_sectors(rq))); 1313 SCSI_LOG_HLQUEUE(2, 1314 scmd_printk(KERN_INFO, cmd, 1315 "%s %d/%u 512 byte blocks.\n", 1316 write ? "writing" : "reading", nr_blocks, 1317 blk_rq_sectors(rq))); 1318 1319 /* 1320 * This indicates that the command is ready from our end to be queued. 1321 */ 1322 return BLK_STS_OK; 1323 fail: 1324 scsi_free_sgtables(cmd); 1325 return ret; 1326 } 1327 1328 static blk_status_t sd_init_command(struct scsi_cmnd *cmd) 1329 { 1330 struct request *rq = cmd->request; 1331 1332 switch (req_op(rq)) { 1333 case REQ_OP_DISCARD: 1334 switch (scsi_disk(rq->rq_disk)->provisioning_mode) { 1335 case SD_LBP_UNMAP: 1336 return sd_setup_unmap_cmnd(cmd); 1337 case SD_LBP_WS16: 1338 return sd_setup_write_same16_cmnd(cmd, true); 1339 case SD_LBP_WS10: 1340 return sd_setup_write_same10_cmnd(cmd, true); 1341 case SD_LBP_ZERO: 1342 return sd_setup_write_same10_cmnd(cmd, false); 1343 default: 1344 return BLK_STS_TARGET; 1345 } 1346 case REQ_OP_WRITE_ZEROES: 1347 return sd_setup_write_zeroes_cmnd(cmd); 1348 case REQ_OP_WRITE_SAME: 1349 return sd_setup_write_same_cmnd(cmd); 1350 case REQ_OP_FLUSH: 1351 return sd_setup_flush_cmnd(cmd); 1352 case REQ_OP_READ: 1353 case REQ_OP_WRITE: 1354 case REQ_OP_ZONE_APPEND: 1355 return sd_setup_read_write_cmnd(cmd); 1356 case REQ_OP_ZONE_RESET: 1357 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER, 1358 false); 1359 case REQ_OP_ZONE_RESET_ALL: 1360 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER, 1361 true); 1362 case REQ_OP_ZONE_OPEN: 1363 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false); 1364 case REQ_OP_ZONE_CLOSE: 1365 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false); 1366 case REQ_OP_ZONE_FINISH: 1367 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false); 1368 default: 1369 WARN_ON_ONCE(1); 1370 return BLK_STS_NOTSUPP; 1371 } 1372 } 1373 1374 static void sd_uninit_command(struct scsi_cmnd *SCpnt) 1375 { 1376 struct request *rq = SCpnt->request; 1377 u8 *cmnd; 1378 1379 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1380 mempool_free(rq->special_vec.bv_page, sd_page_pool); 1381 1382 if (SCpnt->cmnd != scsi_req(rq)->cmd) { 1383 cmnd = SCpnt->cmnd; 1384 SCpnt->cmnd = NULL; 1385 SCpnt->cmd_len = 0; 1386 mempool_free(cmnd, sd_cdb_pool); 1387 } 1388 } 1389 1390 /** 1391 * sd_open - open a scsi disk device 1392 * @bdev: Block device of the scsi disk to open 1393 * @mode: FMODE_* mask 1394 * 1395 * Returns 0 if successful. Returns a negated errno value in case 1396 * of error. 1397 * 1398 * Note: This can be called from a user context (e.g. fsck(1) ) 1399 * or from within the kernel (e.g. as a result of a mount(1) ). 1400 * In the latter case @inode and @filp carry an abridged amount 1401 * of information as noted above. 1402 * 1403 * Locking: called with bdev->bd_mutex held. 1404 **/ 1405 static int sd_open(struct block_device *bdev, fmode_t mode) 1406 { 1407 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 1408 struct scsi_device *sdev; 1409 int retval; 1410 1411 if (!sdkp) 1412 return -ENXIO; 1413 1414 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 1415 1416 sdev = sdkp->device; 1417 1418 /* 1419 * If the device is in error recovery, wait until it is done. 1420 * If the device is offline, then disallow any access to it. 1421 */ 1422 retval = -ENXIO; 1423 if (!scsi_block_when_processing_errors(sdev)) 1424 goto error_out; 1425 1426 if (sdev->removable || sdkp->write_prot) { 1427 if (bdev_check_media_change(bdev)) 1428 sd_revalidate_disk(bdev->bd_disk); 1429 } 1430 1431 /* 1432 * If the drive is empty, just let the open fail. 1433 */ 1434 retval = -ENOMEDIUM; 1435 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 1436 goto error_out; 1437 1438 /* 1439 * If the device has the write protect tab set, have the open fail 1440 * if the user expects to be able to write to the thing. 1441 */ 1442 retval = -EROFS; 1443 if (sdkp->write_prot && (mode & FMODE_WRITE)) 1444 goto error_out; 1445 1446 /* 1447 * It is possible that the disk changing stuff resulted in 1448 * the device being taken offline. If this is the case, 1449 * report this to the user, and don't pretend that the 1450 * open actually succeeded. 1451 */ 1452 retval = -ENXIO; 1453 if (!scsi_device_online(sdev)) 1454 goto error_out; 1455 1456 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 1457 if (scsi_block_when_processing_errors(sdev)) 1458 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 1459 } 1460 1461 return 0; 1462 1463 error_out: 1464 scsi_disk_put(sdkp); 1465 return retval; 1466 } 1467 1468 /** 1469 * sd_release - invoked when the (last) close(2) is called on this 1470 * scsi disk. 1471 * @disk: disk to release 1472 * @mode: FMODE_* mask 1473 * 1474 * Returns 0. 1475 * 1476 * Note: may block (uninterruptible) if error recovery is underway 1477 * on this disk. 1478 * 1479 * Locking: called with bdev->bd_mutex held. 1480 **/ 1481 static void sd_release(struct gendisk *disk, fmode_t mode) 1482 { 1483 struct scsi_disk *sdkp = scsi_disk(disk); 1484 struct scsi_device *sdev = sdkp->device; 1485 1486 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 1487 1488 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 1489 if (scsi_block_when_processing_errors(sdev)) 1490 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 1491 } 1492 1493 scsi_disk_put(sdkp); 1494 } 1495 1496 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1497 { 1498 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 1499 struct scsi_device *sdp = sdkp->device; 1500 struct Scsi_Host *host = sdp->host; 1501 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity); 1502 int diskinfo[4]; 1503 1504 /* default to most commonly used values */ 1505 diskinfo[0] = 0x40; /* 1 << 6 */ 1506 diskinfo[1] = 0x20; /* 1 << 5 */ 1507 diskinfo[2] = capacity >> 11; 1508 1509 /* override with calculated, extended default, or driver values */ 1510 if (host->hostt->bios_param) 1511 host->hostt->bios_param(sdp, bdev, capacity, diskinfo); 1512 else 1513 scsicam_bios_param(bdev, capacity, diskinfo); 1514 1515 geo->heads = diskinfo[0]; 1516 geo->sectors = diskinfo[1]; 1517 geo->cylinders = diskinfo[2]; 1518 return 0; 1519 } 1520 1521 /** 1522 * sd_ioctl_common - process an ioctl 1523 * @bdev: target block device 1524 * @mode: FMODE_* mask 1525 * @cmd: ioctl command number 1526 * @p: this is third argument given to ioctl(2) system call. 1527 * Often contains a pointer. 1528 * 1529 * Returns 0 if successful (some ioctls return positive numbers on 1530 * success as well). Returns a negated errno value in case of error. 1531 * 1532 * Note: most ioctls are forward onto the block subsystem or further 1533 * down in the scsi subsystem. 1534 **/ 1535 static int sd_ioctl_common(struct block_device *bdev, fmode_t mode, 1536 unsigned int cmd, void __user *p) 1537 { 1538 struct gendisk *disk = bdev->bd_disk; 1539 struct scsi_disk *sdkp = scsi_disk(disk); 1540 struct scsi_device *sdp = sdkp->device; 1541 int error; 1542 1543 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " 1544 "cmd=0x%x\n", disk->disk_name, cmd)); 1545 1546 error = scsi_verify_blk_ioctl(bdev, cmd); 1547 if (error < 0) 1548 return error; 1549 1550 /* 1551 * If we are in the middle of error recovery, don't let anyone 1552 * else try and use this device. Also, if error recovery fails, it 1553 * may try and take the device offline, in which case all further 1554 * access to the device is prohibited. 1555 */ 1556 error = scsi_ioctl_block_when_processing_errors(sdp, cmd, 1557 (mode & FMODE_NDELAY) != 0); 1558 if (error) 1559 goto out; 1560 1561 if (is_sed_ioctl(cmd)) 1562 return sed_ioctl(sdkp->opal_dev, cmd, p); 1563 1564 /* 1565 * Send SCSI addressing ioctls directly to mid level, send other 1566 * ioctls to block level and then onto mid level if they can't be 1567 * resolved. 1568 */ 1569 switch (cmd) { 1570 case SCSI_IOCTL_GET_IDLUN: 1571 case SCSI_IOCTL_GET_BUS_NUMBER: 1572 error = scsi_ioctl(sdp, cmd, p); 1573 break; 1574 default: 1575 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); 1576 break; 1577 } 1578 out: 1579 return error; 1580 } 1581 1582 static void set_media_not_present(struct scsi_disk *sdkp) 1583 { 1584 if (sdkp->media_present) 1585 sdkp->device->changed = 1; 1586 1587 if (sdkp->device->removable) { 1588 sdkp->media_present = 0; 1589 sdkp->capacity = 0; 1590 } 1591 } 1592 1593 static int media_not_present(struct scsi_disk *sdkp, 1594 struct scsi_sense_hdr *sshdr) 1595 { 1596 if (!scsi_sense_valid(sshdr)) 1597 return 0; 1598 1599 /* not invoked for commands that could return deferred errors */ 1600 switch (sshdr->sense_key) { 1601 case UNIT_ATTENTION: 1602 case NOT_READY: 1603 /* medium not present */ 1604 if (sshdr->asc == 0x3A) { 1605 set_media_not_present(sdkp); 1606 return 1; 1607 } 1608 } 1609 return 0; 1610 } 1611 1612 /** 1613 * sd_check_events - check media events 1614 * @disk: kernel device descriptor 1615 * @clearing: disk events currently being cleared 1616 * 1617 * Returns mask of DISK_EVENT_*. 1618 * 1619 * Note: this function is invoked from the block subsystem. 1620 **/ 1621 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) 1622 { 1623 struct scsi_disk *sdkp = scsi_disk_get(disk); 1624 struct scsi_device *sdp; 1625 int retval; 1626 bool disk_changed; 1627 1628 if (!sdkp) 1629 return 0; 1630 1631 sdp = sdkp->device; 1632 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); 1633 1634 /* 1635 * If the device is offline, don't send any commands - just pretend as 1636 * if the command failed. If the device ever comes back online, we 1637 * can deal with it then. It is only because of unrecoverable errors 1638 * that we would ever take a device offline in the first place. 1639 */ 1640 if (!scsi_device_online(sdp)) { 1641 set_media_not_present(sdkp); 1642 goto out; 1643 } 1644 1645 /* 1646 * Using TEST_UNIT_READY enables differentiation between drive with 1647 * no cartridge loaded - NOT READY, drive with changed cartridge - 1648 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1649 * 1650 * Drives that auto spin down. eg iomega jaz 1G, will be started 1651 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1652 * sd_revalidate() is called. 1653 */ 1654 if (scsi_block_when_processing_errors(sdp)) { 1655 struct scsi_sense_hdr sshdr = { 0, }; 1656 1657 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, sdkp->max_retries, 1658 &sshdr); 1659 1660 /* failed to execute TUR, assume media not present */ 1661 if (host_byte(retval)) { 1662 set_media_not_present(sdkp); 1663 goto out; 1664 } 1665 1666 if (media_not_present(sdkp, &sshdr)) 1667 goto out; 1668 } 1669 1670 /* 1671 * For removable scsi disk we have to recognise the presence 1672 * of a disk in the drive. 1673 */ 1674 if (!sdkp->media_present) 1675 sdp->changed = 1; 1676 sdkp->media_present = 1; 1677 out: 1678 /* 1679 * sdp->changed is set under the following conditions: 1680 * 1681 * Medium present state has changed in either direction. 1682 * Device has indicated UNIT_ATTENTION. 1683 */ 1684 disk_changed = sdp->changed; 1685 sdp->changed = 0; 1686 scsi_disk_put(sdkp); 1687 return disk_changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1688 } 1689 1690 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr) 1691 { 1692 int retries, res; 1693 struct scsi_device *sdp = sdkp->device; 1694 const int timeout = sdp->request_queue->rq_timeout 1695 * SD_FLUSH_TIMEOUT_MULTIPLIER; 1696 struct scsi_sense_hdr my_sshdr; 1697 1698 if (!scsi_device_online(sdp)) 1699 return -ENODEV; 1700 1701 /* caller might not be interested in sense, but we need it */ 1702 if (!sshdr) 1703 sshdr = &my_sshdr; 1704 1705 for (retries = 3; retries > 0; --retries) { 1706 unsigned char cmd[10] = { 0 }; 1707 1708 cmd[0] = SYNCHRONIZE_CACHE; 1709 /* 1710 * Leave the rest of the command zero to indicate 1711 * flush everything. 1712 */ 1713 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr, 1714 timeout, sdkp->max_retries, 0, RQF_PM, NULL); 1715 if (res == 0) 1716 break; 1717 } 1718 1719 if (res) { 1720 sd_print_result(sdkp, "Synchronize Cache(10) failed", res); 1721 1722 if (driver_byte(res) == DRIVER_SENSE) 1723 sd_print_sense_hdr(sdkp, sshdr); 1724 1725 /* we need to evaluate the error return */ 1726 if (scsi_sense_valid(sshdr) && 1727 (sshdr->asc == 0x3a || /* medium not present */ 1728 sshdr->asc == 0x20 || /* invalid command */ 1729 (sshdr->asc == 0x74 && sshdr->ascq == 0x71))) /* drive is password locked */ 1730 /* this is no error here */ 1731 return 0; 1732 1733 switch (host_byte(res)) { 1734 /* ignore errors due to racing a disconnection */ 1735 case DID_BAD_TARGET: 1736 case DID_NO_CONNECT: 1737 return 0; 1738 /* signal the upper layer it might try again */ 1739 case DID_BUS_BUSY: 1740 case DID_IMM_RETRY: 1741 case DID_REQUEUE: 1742 case DID_SOFT_ERROR: 1743 return -EBUSY; 1744 default: 1745 return -EIO; 1746 } 1747 } 1748 return 0; 1749 } 1750 1751 static void sd_rescan(struct device *dev) 1752 { 1753 struct scsi_disk *sdkp = dev_get_drvdata(dev); 1754 1755 sd_revalidate_disk(sdkp->disk); 1756 } 1757 1758 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 1759 unsigned int cmd, unsigned long arg) 1760 { 1761 void __user *p = (void __user *)arg; 1762 int ret; 1763 1764 ret = sd_ioctl_common(bdev, mode, cmd, p); 1765 if (ret != -ENOTTY) 1766 return ret; 1767 1768 return scsi_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p); 1769 } 1770 1771 #ifdef CONFIG_COMPAT 1772 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1773 unsigned int cmd, unsigned long arg) 1774 { 1775 void __user *p = compat_ptr(arg); 1776 int ret; 1777 1778 ret = sd_ioctl_common(bdev, mode, cmd, p); 1779 if (ret != -ENOTTY) 1780 return ret; 1781 1782 return scsi_compat_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p); 1783 } 1784 #endif 1785 1786 static char sd_pr_type(enum pr_type type) 1787 { 1788 switch (type) { 1789 case PR_WRITE_EXCLUSIVE: 1790 return 0x01; 1791 case PR_EXCLUSIVE_ACCESS: 1792 return 0x03; 1793 case PR_WRITE_EXCLUSIVE_REG_ONLY: 1794 return 0x05; 1795 case PR_EXCLUSIVE_ACCESS_REG_ONLY: 1796 return 0x06; 1797 case PR_WRITE_EXCLUSIVE_ALL_REGS: 1798 return 0x07; 1799 case PR_EXCLUSIVE_ACCESS_ALL_REGS: 1800 return 0x08; 1801 default: 1802 return 0; 1803 } 1804 }; 1805 1806 static int sd_pr_command(struct block_device *bdev, u8 sa, 1807 u64 key, u64 sa_key, u8 type, u8 flags) 1808 { 1809 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 1810 struct scsi_device *sdev = sdkp->device; 1811 struct scsi_sense_hdr sshdr; 1812 int result; 1813 u8 cmd[16] = { 0, }; 1814 u8 data[24] = { 0, }; 1815 1816 cmd[0] = PERSISTENT_RESERVE_OUT; 1817 cmd[1] = sa; 1818 cmd[2] = type; 1819 put_unaligned_be32(sizeof(data), &cmd[5]); 1820 1821 put_unaligned_be64(key, &data[0]); 1822 put_unaligned_be64(sa_key, &data[8]); 1823 data[20] = flags; 1824 1825 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data), 1826 &sshdr, SD_TIMEOUT, sdkp->max_retries, NULL); 1827 1828 if (driver_byte(result) == DRIVER_SENSE && 1829 scsi_sense_valid(&sshdr)) { 1830 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result); 1831 scsi_print_sense_hdr(sdev, NULL, &sshdr); 1832 } 1833 1834 return result; 1835 } 1836 1837 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, 1838 u32 flags) 1839 { 1840 if (flags & ~PR_FL_IGNORE_KEY) 1841 return -EOPNOTSUPP; 1842 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00, 1843 old_key, new_key, 0, 1844 (1 << 0) /* APTPL */); 1845 } 1846 1847 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, 1848 u32 flags) 1849 { 1850 if (flags) 1851 return -EOPNOTSUPP; 1852 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0); 1853 } 1854 1855 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type) 1856 { 1857 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0); 1858 } 1859 1860 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, 1861 enum pr_type type, bool abort) 1862 { 1863 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key, 1864 sd_pr_type(type), 0); 1865 } 1866 1867 static int sd_pr_clear(struct block_device *bdev, u64 key) 1868 { 1869 return sd_pr_command(bdev, 0x03, key, 0, 0, 0); 1870 } 1871 1872 static const struct pr_ops sd_pr_ops = { 1873 .pr_register = sd_pr_register, 1874 .pr_reserve = sd_pr_reserve, 1875 .pr_release = sd_pr_release, 1876 .pr_preempt = sd_pr_preempt, 1877 .pr_clear = sd_pr_clear, 1878 }; 1879 1880 static const struct block_device_operations sd_fops = { 1881 .owner = THIS_MODULE, 1882 .open = sd_open, 1883 .release = sd_release, 1884 .ioctl = sd_ioctl, 1885 .getgeo = sd_getgeo, 1886 #ifdef CONFIG_COMPAT 1887 .compat_ioctl = sd_compat_ioctl, 1888 #endif 1889 .check_events = sd_check_events, 1890 .unlock_native_capacity = sd_unlock_native_capacity, 1891 .report_zones = sd_zbc_report_zones, 1892 .pr_ops = &sd_pr_ops, 1893 }; 1894 1895 /** 1896 * sd_eh_reset - reset error handling callback 1897 * @scmd: sd-issued command that has failed 1898 * 1899 * This function is called by the SCSI midlayer before starting 1900 * SCSI EH. When counting medium access failures we have to be 1901 * careful to register it only only once per device and SCSI EH run; 1902 * there might be several timed out commands which will cause the 1903 * 'max_medium_access_timeouts' counter to trigger after the first 1904 * SCSI EH run already and set the device to offline. 1905 * So this function resets the internal counter before starting SCSI EH. 1906 **/ 1907 static void sd_eh_reset(struct scsi_cmnd *scmd) 1908 { 1909 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1910 1911 /* New SCSI EH run, reset gate variable */ 1912 sdkp->ignore_medium_access_errors = false; 1913 } 1914 1915 /** 1916 * sd_eh_action - error handling callback 1917 * @scmd: sd-issued command that has failed 1918 * @eh_disp: The recovery disposition suggested by the midlayer 1919 * 1920 * This function is called by the SCSI midlayer upon completion of an 1921 * error test command (currently TEST UNIT READY). The result of sending 1922 * the eh command is passed in eh_disp. We're looking for devices that 1923 * fail medium access commands but are OK with non access commands like 1924 * test unit ready (so wrongly see the device as having a successful 1925 * recovery) 1926 **/ 1927 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp) 1928 { 1929 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1930 struct scsi_device *sdev = scmd->device; 1931 1932 if (!scsi_device_online(sdev) || 1933 !scsi_medium_access_command(scmd) || 1934 host_byte(scmd->result) != DID_TIME_OUT || 1935 eh_disp != SUCCESS) 1936 return eh_disp; 1937 1938 /* 1939 * The device has timed out executing a medium access command. 1940 * However, the TEST UNIT READY command sent during error 1941 * handling completed successfully. Either the device is in the 1942 * process of recovering or has it suffered an internal failure 1943 * that prevents access to the storage medium. 1944 */ 1945 if (!sdkp->ignore_medium_access_errors) { 1946 sdkp->medium_access_timed_out++; 1947 sdkp->ignore_medium_access_errors = true; 1948 } 1949 1950 /* 1951 * If the device keeps failing read/write commands but TEST UNIT 1952 * READY always completes successfully we assume that medium 1953 * access is no longer possible and take the device offline. 1954 */ 1955 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { 1956 scmd_printk(KERN_ERR, scmd, 1957 "Medium access timeout failure. Offlining disk!\n"); 1958 mutex_lock(&sdev->state_mutex); 1959 scsi_device_set_state(sdev, SDEV_OFFLINE); 1960 mutex_unlock(&sdev->state_mutex); 1961 1962 return SUCCESS; 1963 } 1964 1965 return eh_disp; 1966 } 1967 1968 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1969 { 1970 struct request *req = scmd->request; 1971 struct scsi_device *sdev = scmd->device; 1972 unsigned int transferred, good_bytes; 1973 u64 start_lba, end_lba, bad_lba; 1974 1975 /* 1976 * Some commands have a payload smaller than the device logical 1977 * block size (e.g. INQUIRY on a 4K disk). 1978 */ 1979 if (scsi_bufflen(scmd) <= sdev->sector_size) 1980 return 0; 1981 1982 /* Check if we have a 'bad_lba' information */ 1983 if (!scsi_get_sense_info_fld(scmd->sense_buffer, 1984 SCSI_SENSE_BUFFERSIZE, 1985 &bad_lba)) 1986 return 0; 1987 1988 /* 1989 * If the bad lba was reported incorrectly, we have no idea where 1990 * the error is. 1991 */ 1992 start_lba = sectors_to_logical(sdev, blk_rq_pos(req)); 1993 end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd)); 1994 if (bad_lba < start_lba || bad_lba >= end_lba) 1995 return 0; 1996 1997 /* 1998 * resid is optional but mostly filled in. When it's unused, 1999 * its value is zero, so we assume the whole buffer transferred 2000 */ 2001 transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 2002 2003 /* This computation should always be done in terms of the 2004 * resolution of the device's medium. 2005 */ 2006 good_bytes = logical_to_bytes(sdev, bad_lba - start_lba); 2007 2008 return min(good_bytes, transferred); 2009 } 2010 2011 /** 2012 * sd_done - bottom half handler: called when the lower level 2013 * driver has completed (successfully or otherwise) a scsi command. 2014 * @SCpnt: mid-level's per command structure. 2015 * 2016 * Note: potentially run from within an ISR. Must not block. 2017 **/ 2018 static int sd_done(struct scsi_cmnd *SCpnt) 2019 { 2020 int result = SCpnt->result; 2021 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 2022 unsigned int sector_size = SCpnt->device->sector_size; 2023 unsigned int resid; 2024 struct scsi_sense_hdr sshdr; 2025 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 2026 struct request *req = SCpnt->request; 2027 int sense_valid = 0; 2028 int sense_deferred = 0; 2029 2030 switch (req_op(req)) { 2031 case REQ_OP_DISCARD: 2032 case REQ_OP_WRITE_ZEROES: 2033 case REQ_OP_WRITE_SAME: 2034 case REQ_OP_ZONE_RESET: 2035 case REQ_OP_ZONE_RESET_ALL: 2036 case REQ_OP_ZONE_OPEN: 2037 case REQ_OP_ZONE_CLOSE: 2038 case REQ_OP_ZONE_FINISH: 2039 if (!result) { 2040 good_bytes = blk_rq_bytes(req); 2041 scsi_set_resid(SCpnt, 0); 2042 } else { 2043 good_bytes = 0; 2044 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 2045 } 2046 break; 2047 default: 2048 /* 2049 * In case of bogus fw or device, we could end up having 2050 * an unaligned partial completion. Check this here and force 2051 * alignment. 2052 */ 2053 resid = scsi_get_resid(SCpnt); 2054 if (resid & (sector_size - 1)) { 2055 sd_printk(KERN_INFO, sdkp, 2056 "Unaligned partial completion (resid=%u, sector_sz=%u)\n", 2057 resid, sector_size); 2058 scsi_print_command(SCpnt); 2059 resid = min(scsi_bufflen(SCpnt), 2060 round_up(resid, sector_size)); 2061 scsi_set_resid(SCpnt, resid); 2062 } 2063 } 2064 2065 if (result) { 2066 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 2067 if (sense_valid) 2068 sense_deferred = scsi_sense_is_deferred(&sshdr); 2069 } 2070 sdkp->medium_access_timed_out = 0; 2071 2072 if (driver_byte(result) != DRIVER_SENSE && 2073 (!sense_valid || sense_deferred)) 2074 goto out; 2075 2076 switch (sshdr.sense_key) { 2077 case HARDWARE_ERROR: 2078 case MEDIUM_ERROR: 2079 good_bytes = sd_completed_bytes(SCpnt); 2080 break; 2081 case RECOVERED_ERROR: 2082 good_bytes = scsi_bufflen(SCpnt); 2083 break; 2084 case NO_SENSE: 2085 /* This indicates a false check condition, so ignore it. An 2086 * unknown amount of data was transferred so treat it as an 2087 * error. 2088 */ 2089 SCpnt->result = 0; 2090 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2091 break; 2092 case ABORTED_COMMAND: 2093 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 2094 good_bytes = sd_completed_bytes(SCpnt); 2095 break; 2096 case ILLEGAL_REQUEST: 2097 switch (sshdr.asc) { 2098 case 0x10: /* DIX: Host detected corruption */ 2099 good_bytes = sd_completed_bytes(SCpnt); 2100 break; 2101 case 0x20: /* INVALID COMMAND OPCODE */ 2102 case 0x24: /* INVALID FIELD IN CDB */ 2103 switch (SCpnt->cmnd[0]) { 2104 case UNMAP: 2105 sd_config_discard(sdkp, SD_LBP_DISABLE); 2106 break; 2107 case WRITE_SAME_16: 2108 case WRITE_SAME: 2109 if (SCpnt->cmnd[1] & 8) { /* UNMAP */ 2110 sd_config_discard(sdkp, SD_LBP_DISABLE); 2111 } else { 2112 sdkp->device->no_write_same = 1; 2113 sd_config_write_same(sdkp); 2114 req->rq_flags |= RQF_QUIET; 2115 } 2116 break; 2117 } 2118 } 2119 break; 2120 default: 2121 break; 2122 } 2123 2124 out: 2125 if (sd_is_zoned(sdkp)) 2126 good_bytes = sd_zbc_complete(SCpnt, good_bytes, &sshdr); 2127 2128 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 2129 "sd_done: completed %d of %d bytes\n", 2130 good_bytes, scsi_bufflen(SCpnt))); 2131 2132 return good_bytes; 2133 } 2134 2135 /* 2136 * spinup disk - called only in sd_revalidate_disk() 2137 */ 2138 static void 2139 sd_spinup_disk(struct scsi_disk *sdkp) 2140 { 2141 unsigned char cmd[10]; 2142 unsigned long spintime_expire = 0; 2143 int retries, spintime; 2144 unsigned int the_result; 2145 struct scsi_sense_hdr sshdr; 2146 int sense_valid = 0; 2147 2148 spintime = 0; 2149 2150 /* Spin up drives, as required. Only do this at boot time */ 2151 /* Spinup needs to be done for module loads too. */ 2152 do { 2153 retries = 0; 2154 2155 do { 2156 cmd[0] = TEST_UNIT_READY; 2157 memset((void *) &cmd[1], 0, 9); 2158 2159 the_result = scsi_execute_req(sdkp->device, cmd, 2160 DMA_NONE, NULL, 0, 2161 &sshdr, SD_TIMEOUT, 2162 sdkp->max_retries, NULL); 2163 2164 /* 2165 * If the drive has indicated to us that it 2166 * doesn't have any media in it, don't bother 2167 * with any more polling. 2168 */ 2169 if (media_not_present(sdkp, &sshdr)) 2170 return; 2171 2172 if (the_result) 2173 sense_valid = scsi_sense_valid(&sshdr); 2174 retries++; 2175 } while (retries < 3 && 2176 (!scsi_status_is_good(the_result) || 2177 ((driver_byte(the_result) == DRIVER_SENSE) && 2178 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 2179 2180 if (driver_byte(the_result) != DRIVER_SENSE) { 2181 /* no sense, TUR either succeeded or failed 2182 * with a status error */ 2183 if(!spintime && !scsi_status_is_good(the_result)) { 2184 sd_print_result(sdkp, "Test Unit Ready failed", 2185 the_result); 2186 } 2187 break; 2188 } 2189 2190 /* 2191 * The device does not want the automatic start to be issued. 2192 */ 2193 if (sdkp->device->no_start_on_add) 2194 break; 2195 2196 if (sense_valid && sshdr.sense_key == NOT_READY) { 2197 if (sshdr.asc == 4 && sshdr.ascq == 3) 2198 break; /* manual intervention required */ 2199 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 2200 break; /* standby */ 2201 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 2202 break; /* unavailable */ 2203 if (sshdr.asc == 4 && sshdr.ascq == 0x1b) 2204 break; /* sanitize in progress */ 2205 /* 2206 * Issue command to spin up drive when not ready 2207 */ 2208 if (!spintime) { 2209 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 2210 cmd[0] = START_STOP; 2211 cmd[1] = 1; /* Return immediately */ 2212 memset((void *) &cmd[2], 0, 8); 2213 cmd[4] = 1; /* Start spin cycle */ 2214 if (sdkp->device->start_stop_pwr_cond) 2215 cmd[4] |= 1 << 4; 2216 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 2217 NULL, 0, &sshdr, 2218 SD_TIMEOUT, sdkp->max_retries, 2219 NULL); 2220 spintime_expire = jiffies + 100 * HZ; 2221 spintime = 1; 2222 } 2223 /* Wait 1 second for next try */ 2224 msleep(1000); 2225 printk(KERN_CONT "."); 2226 2227 /* 2228 * Wait for USB flash devices with slow firmware. 2229 * Yes, this sense key/ASC combination shouldn't 2230 * occur here. It's characteristic of these devices. 2231 */ 2232 } else if (sense_valid && 2233 sshdr.sense_key == UNIT_ATTENTION && 2234 sshdr.asc == 0x28) { 2235 if (!spintime) { 2236 spintime_expire = jiffies + 5 * HZ; 2237 spintime = 1; 2238 } 2239 /* Wait 1 second for next try */ 2240 msleep(1000); 2241 } else { 2242 /* we don't understand the sense code, so it's 2243 * probably pointless to loop */ 2244 if(!spintime) { 2245 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 2246 sd_print_sense_hdr(sdkp, &sshdr); 2247 } 2248 break; 2249 } 2250 2251 } while (spintime && time_before_eq(jiffies, spintime_expire)); 2252 2253 if (spintime) { 2254 if (scsi_status_is_good(the_result)) 2255 printk(KERN_CONT "ready\n"); 2256 else 2257 printk(KERN_CONT "not responding...\n"); 2258 } 2259 } 2260 2261 /* 2262 * Determine whether disk supports Data Integrity Field. 2263 */ 2264 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 2265 { 2266 struct scsi_device *sdp = sdkp->device; 2267 u8 type; 2268 int ret = 0; 2269 2270 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) { 2271 sdkp->protection_type = 0; 2272 return ret; 2273 } 2274 2275 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 2276 2277 if (type > T10_PI_TYPE3_PROTECTION) 2278 ret = -ENODEV; 2279 else if (scsi_host_dif_capable(sdp->host, type)) 2280 ret = 1; 2281 2282 if (sdkp->first_scan || type != sdkp->protection_type) 2283 switch (ret) { 2284 case -ENODEV: 2285 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ 2286 " protection type %u. Disabling disk!\n", 2287 type); 2288 break; 2289 case 1: 2290 sd_printk(KERN_NOTICE, sdkp, 2291 "Enabling DIF Type %u protection\n", type); 2292 break; 2293 case 0: 2294 sd_printk(KERN_NOTICE, sdkp, 2295 "Disabling DIF Type %u protection\n", type); 2296 break; 2297 } 2298 2299 sdkp->protection_type = type; 2300 2301 return ret; 2302 } 2303 2304 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 2305 struct scsi_sense_hdr *sshdr, int sense_valid, 2306 int the_result) 2307 { 2308 if (driver_byte(the_result) == DRIVER_SENSE) 2309 sd_print_sense_hdr(sdkp, sshdr); 2310 else 2311 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 2312 2313 /* 2314 * Set dirty bit for removable devices if not ready - 2315 * sometimes drives will not report this properly. 2316 */ 2317 if (sdp->removable && 2318 sense_valid && sshdr->sense_key == NOT_READY) 2319 set_media_not_present(sdkp); 2320 2321 /* 2322 * We used to set media_present to 0 here to indicate no media 2323 * in the drive, but some drives fail read capacity even with 2324 * media present, so we can't do that. 2325 */ 2326 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 2327 } 2328 2329 #define RC16_LEN 32 2330 #if RC16_LEN > SD_BUF_SIZE 2331 #error RC16_LEN must not be more than SD_BUF_SIZE 2332 #endif 2333 2334 #define READ_CAPACITY_RETRIES_ON_RESET 10 2335 2336 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 2337 unsigned char *buffer) 2338 { 2339 unsigned char cmd[16]; 2340 struct scsi_sense_hdr sshdr; 2341 int sense_valid = 0; 2342 int the_result; 2343 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2344 unsigned int alignment; 2345 unsigned long long lba; 2346 unsigned sector_size; 2347 2348 if (sdp->no_read_capacity_16) 2349 return -EINVAL; 2350 2351 do { 2352 memset(cmd, 0, 16); 2353 cmd[0] = SERVICE_ACTION_IN_16; 2354 cmd[1] = SAI_READ_CAPACITY_16; 2355 cmd[13] = RC16_LEN; 2356 memset(buffer, 0, RC16_LEN); 2357 2358 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2359 buffer, RC16_LEN, &sshdr, 2360 SD_TIMEOUT, sdkp->max_retries, NULL); 2361 2362 if (media_not_present(sdkp, &sshdr)) 2363 return -ENODEV; 2364 2365 if (the_result) { 2366 sense_valid = scsi_sense_valid(&sshdr); 2367 if (sense_valid && 2368 sshdr.sense_key == ILLEGAL_REQUEST && 2369 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 2370 sshdr.ascq == 0x00) 2371 /* Invalid Command Operation Code or 2372 * Invalid Field in CDB, just retry 2373 * silently with RC10 */ 2374 return -EINVAL; 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(16) 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[8]); 2394 lba = get_unaligned_be64(&buffer[0]); 2395 2396 if (sd_read_protection_type(sdkp, buffer) < 0) { 2397 sdkp->capacity = 0; 2398 return -ENODEV; 2399 } 2400 2401 /* Logical blocks per physical block exponent */ 2402 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 2403 2404 /* RC basis */ 2405 sdkp->rc_basis = (buffer[12] >> 4) & 0x3; 2406 2407 /* Lowest aligned logical block */ 2408 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 2409 blk_queue_alignment_offset(sdp->request_queue, alignment); 2410 if (alignment && sdkp->first_scan) 2411 sd_printk(KERN_NOTICE, sdkp, 2412 "physical block alignment offset: %u\n", alignment); 2413 2414 if (buffer[14] & 0x80) { /* LBPME */ 2415 sdkp->lbpme = 1; 2416 2417 if (buffer[14] & 0x40) /* LBPRZ */ 2418 sdkp->lbprz = 1; 2419 2420 sd_config_discard(sdkp, SD_LBP_WS16); 2421 } 2422 2423 sdkp->capacity = lba + 1; 2424 return sector_size; 2425 } 2426 2427 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 2428 unsigned char *buffer) 2429 { 2430 unsigned char cmd[16]; 2431 struct scsi_sense_hdr sshdr; 2432 int sense_valid = 0; 2433 int the_result; 2434 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2435 sector_t lba; 2436 unsigned sector_size; 2437 2438 do { 2439 cmd[0] = READ_CAPACITY; 2440 memset(&cmd[1], 0, 9); 2441 memset(buffer, 0, 8); 2442 2443 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2444 buffer, 8, &sshdr, 2445 SD_TIMEOUT, sdkp->max_retries, NULL); 2446 2447 if (media_not_present(sdkp, &sshdr)) 2448 return -ENODEV; 2449 2450 if (the_result) { 2451 sense_valid = scsi_sense_valid(&sshdr); 2452 if (sense_valid && 2453 sshdr.sense_key == UNIT_ATTENTION && 2454 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2455 /* Device reset might occur several times, 2456 * give it one more chance */ 2457 if (--reset_retries > 0) 2458 continue; 2459 } 2460 retries--; 2461 2462 } while (the_result && retries); 2463 2464 if (the_result) { 2465 sd_print_result(sdkp, "Read Capacity(10) failed", the_result); 2466 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2467 return -EINVAL; 2468 } 2469 2470 sector_size = get_unaligned_be32(&buffer[4]); 2471 lba = get_unaligned_be32(&buffer[0]); 2472 2473 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 2474 /* Some buggy (usb cardreader) devices return an lba of 2475 0xffffffff when the want to report a size of 0 (with 2476 which they really mean no media is present) */ 2477 sdkp->capacity = 0; 2478 sdkp->physical_block_size = sector_size; 2479 return sector_size; 2480 } 2481 2482 sdkp->capacity = lba + 1; 2483 sdkp->physical_block_size = sector_size; 2484 return sector_size; 2485 } 2486 2487 static int sd_try_rc16_first(struct scsi_device *sdp) 2488 { 2489 if (sdp->host->max_cmd_len < 16) 2490 return 0; 2491 if (sdp->try_rc_10_first) 2492 return 0; 2493 if (sdp->scsi_level > SCSI_SPC_2) 2494 return 1; 2495 if (scsi_device_protection(sdp)) 2496 return 1; 2497 return 0; 2498 } 2499 2500 /* 2501 * read disk capacity 2502 */ 2503 static void 2504 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 2505 { 2506 int sector_size; 2507 struct scsi_device *sdp = sdkp->device; 2508 2509 if (sd_try_rc16_first(sdp)) { 2510 sector_size = read_capacity_16(sdkp, sdp, buffer); 2511 if (sector_size == -EOVERFLOW) 2512 goto got_data; 2513 if (sector_size == -ENODEV) 2514 return; 2515 if (sector_size < 0) 2516 sector_size = read_capacity_10(sdkp, sdp, buffer); 2517 if (sector_size < 0) 2518 return; 2519 } else { 2520 sector_size = read_capacity_10(sdkp, sdp, buffer); 2521 if (sector_size == -EOVERFLOW) 2522 goto got_data; 2523 if (sector_size < 0) 2524 return; 2525 if ((sizeof(sdkp->capacity) > 4) && 2526 (sdkp->capacity > 0xffffffffULL)) { 2527 int old_sector_size = sector_size; 2528 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 2529 "Trying to use READ CAPACITY(16).\n"); 2530 sector_size = read_capacity_16(sdkp, sdp, buffer); 2531 if (sector_size < 0) { 2532 sd_printk(KERN_NOTICE, sdkp, 2533 "Using 0xffffffff as device size\n"); 2534 sdkp->capacity = 1 + (sector_t) 0xffffffff; 2535 sector_size = old_sector_size; 2536 goto got_data; 2537 } 2538 /* Remember that READ CAPACITY(16) succeeded */ 2539 sdp->try_rc_10_first = 0; 2540 } 2541 } 2542 2543 /* Some devices are known to return the total number of blocks, 2544 * not the highest block number. Some devices have versions 2545 * which do this and others which do not. Some devices we might 2546 * suspect of doing this but we don't know for certain. 2547 * 2548 * If we know the reported capacity is wrong, decrement it. If 2549 * we can only guess, then assume the number of blocks is even 2550 * (usually true but not always) and err on the side of lowering 2551 * the capacity. 2552 */ 2553 if (sdp->fix_capacity || 2554 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 2555 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 2556 "from its reported value: %llu\n", 2557 (unsigned long long) sdkp->capacity); 2558 --sdkp->capacity; 2559 } 2560 2561 got_data: 2562 if (sector_size == 0) { 2563 sector_size = 512; 2564 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 2565 "assuming 512.\n"); 2566 } 2567 2568 if (sector_size != 512 && 2569 sector_size != 1024 && 2570 sector_size != 2048 && 2571 sector_size != 4096) { 2572 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 2573 sector_size); 2574 /* 2575 * The user might want to re-format the drive with 2576 * a supported sectorsize. Once this happens, it 2577 * would be relatively trivial to set the thing up. 2578 * For this reason, we leave the thing in the table. 2579 */ 2580 sdkp->capacity = 0; 2581 /* 2582 * set a bogus sector size so the normal read/write 2583 * logic in the block layer will eventually refuse any 2584 * request on this device without tripping over power 2585 * of two sector size assumptions 2586 */ 2587 sector_size = 512; 2588 } 2589 blk_queue_logical_block_size(sdp->request_queue, sector_size); 2590 blk_queue_physical_block_size(sdp->request_queue, 2591 sdkp->physical_block_size); 2592 sdkp->device->sector_size = sector_size; 2593 2594 if (sdkp->capacity > 0xffffffff) 2595 sdp->use_16_for_rw = 1; 2596 2597 } 2598 2599 /* 2600 * Print disk capacity 2601 */ 2602 static void 2603 sd_print_capacity(struct scsi_disk *sdkp, 2604 sector_t old_capacity) 2605 { 2606 int sector_size = sdkp->device->sector_size; 2607 char cap_str_2[10], cap_str_10[10]; 2608 2609 if (!sdkp->first_scan && old_capacity == sdkp->capacity) 2610 return; 2611 2612 string_get_size(sdkp->capacity, sector_size, 2613 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); 2614 string_get_size(sdkp->capacity, sector_size, 2615 STRING_UNITS_10, cap_str_10, sizeof(cap_str_10)); 2616 2617 sd_printk(KERN_NOTICE, sdkp, 2618 "%llu %d-byte logical blocks: (%s/%s)\n", 2619 (unsigned long long)sdkp->capacity, 2620 sector_size, cap_str_10, cap_str_2); 2621 2622 if (sdkp->physical_block_size != sector_size) 2623 sd_printk(KERN_NOTICE, sdkp, 2624 "%u-byte physical blocks\n", 2625 sdkp->physical_block_size); 2626 } 2627 2628 /* called with buffer of length 512 */ 2629 static inline int 2630 sd_do_mode_sense(struct scsi_disk *sdkp, int dbd, int modepage, 2631 unsigned char *buffer, int len, struct scsi_mode_data *data, 2632 struct scsi_sense_hdr *sshdr) 2633 { 2634 return scsi_mode_sense(sdkp->device, dbd, modepage, buffer, len, 2635 SD_TIMEOUT, sdkp->max_retries, data, 2636 sshdr); 2637 } 2638 2639 /* 2640 * read write protect setting, if possible - called only in sd_revalidate_disk() 2641 * called with buffer of length SD_BUF_SIZE 2642 */ 2643 static void 2644 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 2645 { 2646 int res; 2647 struct scsi_device *sdp = sdkp->device; 2648 struct scsi_mode_data data; 2649 int old_wp = sdkp->write_prot; 2650 2651 set_disk_ro(sdkp->disk, 0); 2652 if (sdp->skip_ms_page_3f) { 2653 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 2654 return; 2655 } 2656 2657 if (sdp->use_192_bytes_for_3f) { 2658 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 192, &data, NULL); 2659 } else { 2660 /* 2661 * First attempt: ask for all pages (0x3F), but only 4 bytes. 2662 * We have to start carefully: some devices hang if we ask 2663 * for more than is available. 2664 */ 2665 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 4, &data, NULL); 2666 2667 /* 2668 * Second attempt: ask for page 0 When only page 0 is 2669 * implemented, a request for page 3F may return Sense Key 2670 * 5: Illegal Request, Sense Code 24: Invalid field in 2671 * CDB. 2672 */ 2673 if (!scsi_status_is_good(res)) 2674 res = sd_do_mode_sense(sdkp, 0, 0, buffer, 4, &data, NULL); 2675 2676 /* 2677 * Third attempt: ask 255 bytes, as we did earlier. 2678 */ 2679 if (!scsi_status_is_good(res)) 2680 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 255, 2681 &data, NULL); 2682 } 2683 2684 if (!scsi_status_is_good(res)) { 2685 sd_first_printk(KERN_WARNING, sdkp, 2686 "Test WP failed, assume Write Enabled\n"); 2687 } else { 2688 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 2689 set_disk_ro(sdkp->disk, sdkp->write_prot); 2690 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 2691 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 2692 sdkp->write_prot ? "on" : "off"); 2693 sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer); 2694 } 2695 } 2696 } 2697 2698 /* 2699 * sd_read_cache_type - called only from sd_revalidate_disk() 2700 * called with buffer of length SD_BUF_SIZE 2701 */ 2702 static void 2703 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 2704 { 2705 int len = 0, res; 2706 struct scsi_device *sdp = sdkp->device; 2707 2708 int dbd; 2709 int modepage; 2710 int first_len; 2711 struct scsi_mode_data data; 2712 struct scsi_sense_hdr sshdr; 2713 int old_wce = sdkp->WCE; 2714 int old_rcd = sdkp->RCD; 2715 int old_dpofua = sdkp->DPOFUA; 2716 2717 2718 if (sdkp->cache_override) 2719 return; 2720 2721 first_len = 4; 2722 if (sdp->skip_ms_page_8) { 2723 if (sdp->type == TYPE_RBC) 2724 goto defaults; 2725 else { 2726 if (sdp->skip_ms_page_3f) 2727 goto defaults; 2728 modepage = 0x3F; 2729 if (sdp->use_192_bytes_for_3f) 2730 first_len = 192; 2731 dbd = 0; 2732 } 2733 } else if (sdp->type == TYPE_RBC) { 2734 modepage = 6; 2735 dbd = 8; 2736 } else { 2737 modepage = 8; 2738 dbd = 0; 2739 } 2740 2741 /* cautiously ask */ 2742 res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, first_len, 2743 &data, &sshdr); 2744 2745 if (!scsi_status_is_good(res)) 2746 goto bad_sense; 2747 2748 if (!data.header_length) { 2749 modepage = 6; 2750 first_len = 0; 2751 sd_first_printk(KERN_ERR, sdkp, 2752 "Missing header in MODE_SENSE response\n"); 2753 } 2754 2755 /* that went OK, now ask for the proper length */ 2756 len = data.length; 2757 2758 /* 2759 * We're only interested in the first three bytes, actually. 2760 * But the data cache page is defined for the first 20. 2761 */ 2762 if (len < 3) 2763 goto bad_sense; 2764 else if (len > SD_BUF_SIZE) { 2765 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " 2766 "data from %d to %d bytes\n", len, SD_BUF_SIZE); 2767 len = SD_BUF_SIZE; 2768 } 2769 if (modepage == 0x3F && sdp->use_192_bytes_for_3f) 2770 len = 192; 2771 2772 /* Get the data */ 2773 if (len > first_len) 2774 res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, len, 2775 &data, &sshdr); 2776 2777 if (scsi_status_is_good(res)) { 2778 int offset = data.header_length + data.block_descriptor_length; 2779 2780 while (offset < len) { 2781 u8 page_code = buffer[offset] & 0x3F; 2782 u8 spf = buffer[offset] & 0x40; 2783 2784 if (page_code == 8 || page_code == 6) { 2785 /* We're interested only in the first 3 bytes. 2786 */ 2787 if (len - offset <= 2) { 2788 sd_first_printk(KERN_ERR, sdkp, 2789 "Incomplete mode parameter " 2790 "data\n"); 2791 goto defaults; 2792 } else { 2793 modepage = page_code; 2794 goto Page_found; 2795 } 2796 } else { 2797 /* Go to the next page */ 2798 if (spf && len - offset > 3) 2799 offset += 4 + (buffer[offset+2] << 8) + 2800 buffer[offset+3]; 2801 else if (!spf && len - offset > 1) 2802 offset += 2 + buffer[offset+1]; 2803 else { 2804 sd_first_printk(KERN_ERR, sdkp, 2805 "Incomplete mode " 2806 "parameter data\n"); 2807 goto defaults; 2808 } 2809 } 2810 } 2811 2812 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n"); 2813 goto defaults; 2814 2815 Page_found: 2816 if (modepage == 8) { 2817 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 2818 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 2819 } else { 2820 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 2821 sdkp->RCD = 0; 2822 } 2823 2824 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 2825 if (sdp->broken_fua) { 2826 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n"); 2827 sdkp->DPOFUA = 0; 2828 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw && 2829 !sdkp->device->use_16_for_rw) { 2830 sd_first_printk(KERN_NOTICE, sdkp, 2831 "Uses READ/WRITE(6), disabling FUA\n"); 2832 sdkp->DPOFUA = 0; 2833 } 2834 2835 /* No cache flush allowed for write protected devices */ 2836 if (sdkp->WCE && sdkp->write_prot) 2837 sdkp->WCE = 0; 2838 2839 if (sdkp->first_scan || old_wce != sdkp->WCE || 2840 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 2841 sd_printk(KERN_NOTICE, sdkp, 2842 "Write cache: %s, read cache: %s, %s\n", 2843 sdkp->WCE ? "enabled" : "disabled", 2844 sdkp->RCD ? "disabled" : "enabled", 2845 sdkp->DPOFUA ? "supports DPO and FUA" 2846 : "doesn't support DPO or FUA"); 2847 2848 return; 2849 } 2850 2851 bad_sense: 2852 if (scsi_sense_valid(&sshdr) && 2853 sshdr.sense_key == ILLEGAL_REQUEST && 2854 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 2855 /* Invalid field in CDB */ 2856 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 2857 else 2858 sd_first_printk(KERN_ERR, sdkp, 2859 "Asking for cache data failed\n"); 2860 2861 defaults: 2862 if (sdp->wce_default_on) { 2863 sd_first_printk(KERN_NOTICE, sdkp, 2864 "Assuming drive cache: write back\n"); 2865 sdkp->WCE = 1; 2866 } else { 2867 sd_first_printk(KERN_ERR, sdkp, 2868 "Assuming drive cache: write through\n"); 2869 sdkp->WCE = 0; 2870 } 2871 sdkp->RCD = 0; 2872 sdkp->DPOFUA = 0; 2873 } 2874 2875 /* 2876 * The ATO bit indicates whether the DIF application tag is available 2877 * for use by the operating system. 2878 */ 2879 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 2880 { 2881 int res, offset; 2882 struct scsi_device *sdp = sdkp->device; 2883 struct scsi_mode_data data; 2884 struct scsi_sense_hdr sshdr; 2885 2886 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 2887 return; 2888 2889 if (sdkp->protection_type == 0) 2890 return; 2891 2892 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 2893 sdkp->max_retries, &data, &sshdr); 2894 2895 if (!scsi_status_is_good(res) || !data.header_length || 2896 data.length < 6) { 2897 sd_first_printk(KERN_WARNING, sdkp, 2898 "getting Control mode page failed, assume no ATO\n"); 2899 2900 if (scsi_sense_valid(&sshdr)) 2901 sd_print_sense_hdr(sdkp, &sshdr); 2902 2903 return; 2904 } 2905 2906 offset = data.header_length + data.block_descriptor_length; 2907 2908 if ((buffer[offset] & 0x3f) != 0x0a) { 2909 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2910 return; 2911 } 2912 2913 if ((buffer[offset + 5] & 0x80) == 0) 2914 return; 2915 2916 sdkp->ATO = 1; 2917 2918 return; 2919 } 2920 2921 /** 2922 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2923 * @sdkp: disk to query 2924 */ 2925 static void sd_read_block_limits(struct scsi_disk *sdkp) 2926 { 2927 unsigned int sector_sz = sdkp->device->sector_size; 2928 const int vpd_len = 64; 2929 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2930 2931 if (!buffer || 2932 /* Block Limits VPD */ 2933 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2934 goto out; 2935 2936 blk_queue_io_min(sdkp->disk->queue, 2937 get_unaligned_be16(&buffer[6]) * sector_sz); 2938 2939 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]); 2940 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]); 2941 2942 if (buffer[3] == 0x3c) { 2943 unsigned int lba_count, desc_count; 2944 2945 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); 2946 2947 if (!sdkp->lbpme) 2948 goto out; 2949 2950 lba_count = get_unaligned_be32(&buffer[20]); 2951 desc_count = get_unaligned_be32(&buffer[24]); 2952 2953 if (lba_count && desc_count) 2954 sdkp->max_unmap_blocks = lba_count; 2955 2956 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); 2957 2958 if (buffer[32] & 0x80) 2959 sdkp->unmap_alignment = 2960 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2961 2962 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ 2963 2964 if (sdkp->max_unmap_blocks) 2965 sd_config_discard(sdkp, SD_LBP_UNMAP); 2966 else 2967 sd_config_discard(sdkp, SD_LBP_WS16); 2968 2969 } else { /* LBP VPD page tells us what to use */ 2970 if (sdkp->lbpu && sdkp->max_unmap_blocks) 2971 sd_config_discard(sdkp, SD_LBP_UNMAP); 2972 else if (sdkp->lbpws) 2973 sd_config_discard(sdkp, SD_LBP_WS16); 2974 else if (sdkp->lbpws10) 2975 sd_config_discard(sdkp, SD_LBP_WS10); 2976 else 2977 sd_config_discard(sdkp, SD_LBP_DISABLE); 2978 } 2979 } 2980 2981 out: 2982 kfree(buffer); 2983 } 2984 2985 /** 2986 * sd_read_block_characteristics - Query block dev. characteristics 2987 * @sdkp: disk to query 2988 */ 2989 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2990 { 2991 struct request_queue *q = sdkp->disk->queue; 2992 unsigned char *buffer; 2993 u16 rot; 2994 const int vpd_len = 64; 2995 2996 buffer = kmalloc(vpd_len, GFP_KERNEL); 2997 2998 if (!buffer || 2999 /* Block Device Characteristics VPD */ 3000 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 3001 goto out; 3002 3003 rot = get_unaligned_be16(&buffer[4]); 3004 3005 if (rot == 1) { 3006 blk_queue_flag_set(QUEUE_FLAG_NONROT, q); 3007 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q); 3008 } 3009 3010 if (sdkp->device->type == TYPE_ZBC) { 3011 /* Host-managed */ 3012 blk_queue_set_zoned(sdkp->disk, BLK_ZONED_HM); 3013 } else { 3014 sdkp->zoned = (buffer[8] >> 4) & 3; 3015 if (sdkp->zoned == 1) { 3016 /* Host-aware */ 3017 blk_queue_set_zoned(sdkp->disk, BLK_ZONED_HA); 3018 } else { 3019 /* Regular disk or drive managed disk */ 3020 blk_queue_set_zoned(sdkp->disk, BLK_ZONED_NONE); 3021 } 3022 } 3023 3024 if (!sdkp->first_scan) 3025 goto out; 3026 3027 if (blk_queue_is_zoned(q)) { 3028 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n", 3029 q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware"); 3030 } else { 3031 if (sdkp->zoned == 1) 3032 sd_printk(KERN_NOTICE, sdkp, 3033 "Host-aware SMR disk used as regular disk\n"); 3034 else if (sdkp->zoned == 2) 3035 sd_printk(KERN_NOTICE, sdkp, 3036 "Drive-managed SMR disk\n"); 3037 } 3038 3039 out: 3040 kfree(buffer); 3041 } 3042 3043 /** 3044 * sd_read_block_provisioning - Query provisioning VPD page 3045 * @sdkp: disk to query 3046 */ 3047 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 3048 { 3049 unsigned char *buffer; 3050 const int vpd_len = 8; 3051 3052 if (sdkp->lbpme == 0) 3053 return; 3054 3055 buffer = kmalloc(vpd_len, GFP_KERNEL); 3056 3057 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) 3058 goto out; 3059 3060 sdkp->lbpvpd = 1; 3061 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ 3062 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ 3063 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ 3064 3065 out: 3066 kfree(buffer); 3067 } 3068 3069 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) 3070 { 3071 struct scsi_device *sdev = sdkp->device; 3072 3073 if (sdev->host->no_write_same) { 3074 sdev->no_write_same = 1; 3075 3076 return; 3077 } 3078 3079 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) { 3080 /* too large values might cause issues with arcmsr */ 3081 int vpd_buf_len = 64; 3082 3083 sdev->no_report_opcodes = 1; 3084 3085 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION 3086 * CODES is unsupported and the device has an ATA 3087 * Information VPD page (SAT). 3088 */ 3089 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len)) 3090 sdev->no_write_same = 1; 3091 } 3092 3093 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1) 3094 sdkp->ws16 = 1; 3095 3096 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1) 3097 sdkp->ws10 = 1; 3098 } 3099 3100 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer) 3101 { 3102 struct scsi_device *sdev = sdkp->device; 3103 3104 if (!sdev->security_supported) 3105 return; 3106 3107 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, 3108 SECURITY_PROTOCOL_IN) == 1 && 3109 scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, 3110 SECURITY_PROTOCOL_OUT) == 1) 3111 sdkp->security = 1; 3112 } 3113 3114 /* 3115 * Determine the device's preferred I/O size for reads and writes 3116 * unless the reported value is unreasonably small, large, not a 3117 * multiple of the physical block size, or simply garbage. 3118 */ 3119 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp, 3120 unsigned int dev_max) 3121 { 3122 struct scsi_device *sdp = sdkp->device; 3123 unsigned int opt_xfer_bytes = 3124 logical_to_bytes(sdp, sdkp->opt_xfer_blocks); 3125 3126 if (sdkp->opt_xfer_blocks == 0) 3127 return false; 3128 3129 if (sdkp->opt_xfer_blocks > dev_max) { 3130 sd_first_printk(KERN_WARNING, sdkp, 3131 "Optimal transfer size %u logical blocks " \ 3132 "> dev_max (%u logical blocks)\n", 3133 sdkp->opt_xfer_blocks, dev_max); 3134 return false; 3135 } 3136 3137 if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) { 3138 sd_first_printk(KERN_WARNING, sdkp, 3139 "Optimal transfer size %u logical blocks " \ 3140 "> sd driver limit (%u logical blocks)\n", 3141 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS); 3142 return false; 3143 } 3144 3145 if (opt_xfer_bytes < PAGE_SIZE) { 3146 sd_first_printk(KERN_WARNING, sdkp, 3147 "Optimal transfer size %u bytes < " \ 3148 "PAGE_SIZE (%u bytes)\n", 3149 opt_xfer_bytes, (unsigned int)PAGE_SIZE); 3150 return false; 3151 } 3152 3153 if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) { 3154 sd_first_printk(KERN_WARNING, sdkp, 3155 "Optimal transfer size %u bytes not a " \ 3156 "multiple of physical block size (%u bytes)\n", 3157 opt_xfer_bytes, sdkp->physical_block_size); 3158 return false; 3159 } 3160 3161 sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n", 3162 opt_xfer_bytes); 3163 return true; 3164 } 3165 3166 /** 3167 * sd_revalidate_disk - called the first time a new disk is seen, 3168 * performs disk spin up, read_capacity, etc. 3169 * @disk: struct gendisk we care about 3170 **/ 3171 static int sd_revalidate_disk(struct gendisk *disk) 3172 { 3173 struct scsi_disk *sdkp = scsi_disk(disk); 3174 struct scsi_device *sdp = sdkp->device; 3175 struct request_queue *q = sdkp->disk->queue; 3176 sector_t old_capacity = sdkp->capacity; 3177 unsigned char *buffer; 3178 unsigned int dev_max, rw_max; 3179 3180 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 3181 "sd_revalidate_disk\n")); 3182 3183 /* 3184 * If the device is offline, don't try and read capacity or any 3185 * of the other niceties. 3186 */ 3187 if (!scsi_device_online(sdp)) 3188 goto out; 3189 3190 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 3191 if (!buffer) { 3192 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 3193 "allocation failure.\n"); 3194 goto out; 3195 } 3196 3197 sd_spinup_disk(sdkp); 3198 3199 /* 3200 * Without media there is no reason to ask; moreover, some devices 3201 * react badly if we do. 3202 */ 3203 if (sdkp->media_present) { 3204 sd_read_capacity(sdkp, buffer); 3205 3206 /* 3207 * set the default to rotational. All non-rotational devices 3208 * support the block characteristics VPD page, which will 3209 * cause this to be updated correctly and any device which 3210 * doesn't support it should be treated as rotational. 3211 */ 3212 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q); 3213 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q); 3214 3215 if (scsi_device_supports_vpd(sdp)) { 3216 sd_read_block_provisioning(sdkp); 3217 sd_read_block_limits(sdkp); 3218 sd_read_block_characteristics(sdkp); 3219 sd_zbc_read_zones(sdkp, buffer); 3220 } 3221 3222 sd_print_capacity(sdkp, old_capacity); 3223 3224 sd_read_write_protect_flag(sdkp, buffer); 3225 sd_read_cache_type(sdkp, buffer); 3226 sd_read_app_tag_own(sdkp, buffer); 3227 sd_read_write_same(sdkp, buffer); 3228 sd_read_security(sdkp, buffer); 3229 } 3230 3231 /* 3232 * We now have all cache related info, determine how we deal 3233 * with flush requests. 3234 */ 3235 sd_set_flush_flag(sdkp); 3236 3237 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */ 3238 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS; 3239 3240 /* Some devices report a maximum block count for READ/WRITE requests. */ 3241 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks); 3242 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max); 3243 3244 if (sd_validate_opt_xfer_size(sdkp, dev_max)) { 3245 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks); 3246 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks); 3247 } else { 3248 q->limits.io_opt = 0; 3249 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max), 3250 (sector_t)BLK_DEF_MAX_SECTORS); 3251 } 3252 3253 /* Do not exceed controller limit */ 3254 rw_max = min(rw_max, queue_max_hw_sectors(q)); 3255 3256 /* 3257 * Only update max_sectors if previously unset or if the current value 3258 * exceeds the capabilities of the hardware. 3259 */ 3260 if (sdkp->first_scan || 3261 q->limits.max_sectors > q->limits.max_dev_sectors || 3262 q->limits.max_sectors > q->limits.max_hw_sectors) 3263 q->limits.max_sectors = rw_max; 3264 3265 sdkp->first_scan = 0; 3266 3267 set_capacity_and_notify(disk, logical_to_sectors(sdp, sdkp->capacity)); 3268 sd_config_write_same(sdkp); 3269 kfree(buffer); 3270 3271 /* 3272 * For a zoned drive, revalidating the zones can be done only once 3273 * the gendisk capacity is set. So if this fails, set back the gendisk 3274 * capacity to 0. 3275 */ 3276 if (sd_zbc_revalidate_zones(sdkp)) 3277 set_capacity_and_notify(disk, 0); 3278 3279 out: 3280 return 0; 3281 } 3282 3283 /** 3284 * sd_unlock_native_capacity - unlock native capacity 3285 * @disk: struct gendisk to set capacity for 3286 * 3287 * Block layer calls this function if it detects that partitions 3288 * on @disk reach beyond the end of the device. If the SCSI host 3289 * implements ->unlock_native_capacity() method, it's invoked to 3290 * give it a chance to adjust the device capacity. 3291 * 3292 * CONTEXT: 3293 * Defined by block layer. Might sleep. 3294 */ 3295 static void sd_unlock_native_capacity(struct gendisk *disk) 3296 { 3297 struct scsi_device *sdev = scsi_disk(disk)->device; 3298 3299 if (sdev->host->hostt->unlock_native_capacity) 3300 sdev->host->hostt->unlock_native_capacity(sdev); 3301 } 3302 3303 /** 3304 * sd_format_disk_name - format disk name 3305 * @prefix: name prefix - ie. "sd" for SCSI disks 3306 * @index: index of the disk to format name for 3307 * @buf: output buffer 3308 * @buflen: length of the output buffer 3309 * 3310 * SCSI disk names starts at sda. The 26th device is sdz and the 3311 * 27th is sdaa. The last one for two lettered suffix is sdzz 3312 * which is followed by sdaaa. 3313 * 3314 * This is basically 26 base counting with one extra 'nil' entry 3315 * at the beginning from the second digit on and can be 3316 * determined using similar method as 26 base conversion with the 3317 * index shifted -1 after each digit is computed. 3318 * 3319 * CONTEXT: 3320 * Don't care. 3321 * 3322 * RETURNS: 3323 * 0 on success, -errno on failure. 3324 */ 3325 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 3326 { 3327 const int base = 'z' - 'a' + 1; 3328 char *begin = buf + strlen(prefix); 3329 char *end = buf + buflen; 3330 char *p; 3331 int unit; 3332 3333 p = end - 1; 3334 *p = '\0'; 3335 unit = base; 3336 do { 3337 if (p == begin) 3338 return -EINVAL; 3339 *--p = 'a' + (index % unit); 3340 index = (index / unit) - 1; 3341 } while (index >= 0); 3342 3343 memmove(begin, p, end - p); 3344 memcpy(buf, prefix, strlen(prefix)); 3345 3346 return 0; 3347 } 3348 3349 /** 3350 * sd_probe - called during driver initialization and whenever a 3351 * new scsi device is attached to the system. It is called once 3352 * for each scsi device (not just disks) present. 3353 * @dev: pointer to device object 3354 * 3355 * Returns 0 if successful (or not interested in this scsi device 3356 * (e.g. scanner)); 1 when there is an error. 3357 * 3358 * Note: this function is invoked from the scsi mid-level. 3359 * This function sets up the mapping between a given 3360 * <host,channel,id,lun> (found in sdp) and new device name 3361 * (e.g. /dev/sda). More precisely it is the block device major 3362 * and minor number that is chosen here. 3363 * 3364 * Assume sd_probe is not re-entrant (for time being) 3365 * Also think about sd_probe() and sd_remove() running coincidentally. 3366 **/ 3367 static int sd_probe(struct device *dev) 3368 { 3369 struct scsi_device *sdp = to_scsi_device(dev); 3370 struct scsi_disk *sdkp; 3371 struct gendisk *gd; 3372 int index; 3373 int error; 3374 3375 scsi_autopm_get_device(sdp); 3376 error = -ENODEV; 3377 if (sdp->type != TYPE_DISK && 3378 sdp->type != TYPE_ZBC && 3379 sdp->type != TYPE_MOD && 3380 sdp->type != TYPE_RBC) 3381 goto out; 3382 3383 if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) && sdp->type == TYPE_ZBC) { 3384 sdev_printk(KERN_WARNING, sdp, 3385 "Unsupported ZBC host-managed device.\n"); 3386 goto out; 3387 } 3388 3389 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 3390 "sd_probe\n")); 3391 3392 error = -ENOMEM; 3393 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 3394 if (!sdkp) 3395 goto out; 3396 3397 gd = alloc_disk(SD_MINORS); 3398 if (!gd) 3399 goto out_free; 3400 3401 index = ida_alloc(&sd_index_ida, GFP_KERNEL); 3402 if (index < 0) { 3403 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); 3404 goto out_put; 3405 } 3406 3407 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 3408 if (error) { 3409 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); 3410 goto out_free_index; 3411 } 3412 3413 sdkp->device = sdp; 3414 sdkp->driver = &sd_template; 3415 sdkp->disk = gd; 3416 sdkp->index = index; 3417 sdkp->max_retries = SD_MAX_RETRIES; 3418 atomic_set(&sdkp->openers, 0); 3419 atomic_set(&sdkp->device->ioerr_cnt, 0); 3420 3421 if (!sdp->request_queue->rq_timeout) { 3422 if (sdp->type != TYPE_MOD) 3423 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 3424 else 3425 blk_queue_rq_timeout(sdp->request_queue, 3426 SD_MOD_TIMEOUT); 3427 } 3428 3429 device_initialize(&sdkp->dev); 3430 sdkp->dev.parent = dev; 3431 sdkp->dev.class = &sd_disk_class; 3432 dev_set_name(&sdkp->dev, "%s", dev_name(dev)); 3433 3434 error = device_add(&sdkp->dev); 3435 if (error) 3436 goto out_free_index; 3437 3438 get_device(dev); 3439 dev_set_drvdata(dev, sdkp); 3440 3441 gd->major = sd_major((index & 0xf0) >> 4); 3442 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 3443 3444 gd->fops = &sd_fops; 3445 gd->private_data = &sdkp->driver; 3446 gd->queue = sdkp->device->request_queue; 3447 3448 /* defaults, until the device tells us otherwise */ 3449 sdp->sector_size = 512; 3450 sdkp->capacity = 0; 3451 sdkp->media_present = 1; 3452 sdkp->write_prot = 0; 3453 sdkp->cache_override = 0; 3454 sdkp->WCE = 0; 3455 sdkp->RCD = 0; 3456 sdkp->ATO = 0; 3457 sdkp->first_scan = 1; 3458 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; 3459 3460 sd_revalidate_disk(gd); 3461 3462 gd->flags = GENHD_FL_EXT_DEVT; 3463 if (sdp->removable) { 3464 gd->flags |= GENHD_FL_REMOVABLE; 3465 gd->events |= DISK_EVENT_MEDIA_CHANGE; 3466 gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; 3467 } 3468 3469 blk_pm_runtime_init(sdp->request_queue, dev); 3470 if (sdp->rpm_autosuspend) { 3471 pm_runtime_set_autosuspend_delay(dev, 3472 sdp->host->hostt->rpm_autosuspend_delay); 3473 } 3474 device_add_disk(dev, gd, NULL); 3475 if (sdkp->capacity) 3476 sd_dif_config_host(sdkp); 3477 3478 sd_revalidate_disk(gd); 3479 3480 if (sdkp->security) { 3481 sdkp->opal_dev = init_opal_dev(sdkp, &sd_sec_submit); 3482 if (sdkp->opal_dev) 3483 sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n"); 3484 } 3485 3486 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 3487 sdp->removable ? "removable " : ""); 3488 scsi_autopm_put_device(sdp); 3489 3490 return 0; 3491 3492 out_free_index: 3493 ida_free(&sd_index_ida, index); 3494 out_put: 3495 put_disk(gd); 3496 out_free: 3497 sd_zbc_release_disk(sdkp); 3498 kfree(sdkp); 3499 out: 3500 scsi_autopm_put_device(sdp); 3501 return error; 3502 } 3503 3504 /** 3505 * sd_remove - called whenever a scsi disk (previously recognized by 3506 * sd_probe) is detached from the system. It is called (potentially 3507 * multiple times) during sd module unload. 3508 * @dev: pointer to device object 3509 * 3510 * Note: this function is invoked from the scsi mid-level. 3511 * This function potentially frees up a device name (e.g. /dev/sdc) 3512 * that could be re-used by a subsequent sd_probe(). 3513 * This function is not called when the built-in sd driver is "exit-ed". 3514 **/ 3515 static int sd_remove(struct device *dev) 3516 { 3517 struct scsi_disk *sdkp; 3518 3519 sdkp = dev_get_drvdata(dev); 3520 scsi_autopm_get_device(sdkp->device); 3521 3522 async_synchronize_full_domain(&scsi_sd_pm_domain); 3523 device_del(&sdkp->dev); 3524 del_gendisk(sdkp->disk); 3525 sd_shutdown(dev); 3526 3527 free_opal_dev(sdkp->opal_dev); 3528 3529 mutex_lock(&sd_ref_mutex); 3530 dev_set_drvdata(dev, NULL); 3531 put_device(&sdkp->dev); 3532 mutex_unlock(&sd_ref_mutex); 3533 3534 return 0; 3535 } 3536 3537 /** 3538 * scsi_disk_release - Called to free the scsi_disk structure 3539 * @dev: pointer to embedded class device 3540 * 3541 * sd_ref_mutex must be held entering this routine. Because it is 3542 * called on last put, you should always use the scsi_disk_get() 3543 * scsi_disk_put() helpers which manipulate the semaphore directly 3544 * and never do a direct put_device. 3545 **/ 3546 static void scsi_disk_release(struct device *dev) 3547 { 3548 struct scsi_disk *sdkp = to_scsi_disk(dev); 3549 struct gendisk *disk = sdkp->disk; 3550 struct request_queue *q = disk->queue; 3551 3552 ida_free(&sd_index_ida, sdkp->index); 3553 3554 /* 3555 * Wait until all requests that are in progress have completed. 3556 * This is necessary to avoid that e.g. scsi_end_request() crashes 3557 * due to clearing the disk->private_data pointer. Wait from inside 3558 * scsi_disk_release() instead of from sd_release() to avoid that 3559 * freezing and unfreezing the request queue affects user space I/O 3560 * in case multiple processes open a /dev/sd... node concurrently. 3561 */ 3562 blk_mq_freeze_queue(q); 3563 blk_mq_unfreeze_queue(q); 3564 3565 disk->private_data = NULL; 3566 put_disk(disk); 3567 put_device(&sdkp->device->sdev_gendev); 3568 3569 sd_zbc_release_disk(sdkp); 3570 3571 kfree(sdkp); 3572 } 3573 3574 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 3575 { 3576 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 3577 struct scsi_sense_hdr sshdr; 3578 struct scsi_device *sdp = sdkp->device; 3579 int res; 3580 3581 if (start) 3582 cmd[4] |= 1; /* START */ 3583 3584 if (sdp->start_stop_pwr_cond) 3585 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 3586 3587 if (!scsi_device_online(sdp)) 3588 return -ENODEV; 3589 3590 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr, 3591 SD_TIMEOUT, sdkp->max_retries, 0, RQF_PM, NULL); 3592 if (res) { 3593 sd_print_result(sdkp, "Start/Stop Unit failed", res); 3594 if (driver_byte(res) == DRIVER_SENSE) 3595 sd_print_sense_hdr(sdkp, &sshdr); 3596 if (scsi_sense_valid(&sshdr) && 3597 /* 0x3a is medium not present */ 3598 sshdr.asc == 0x3a) 3599 res = 0; 3600 } 3601 3602 /* SCSI error codes must not go to the generic layer */ 3603 if (res) 3604 return -EIO; 3605 3606 return 0; 3607 } 3608 3609 /* 3610 * Send a SYNCHRONIZE CACHE instruction down to the device through 3611 * the normal SCSI command structure. Wait for the command to 3612 * complete. 3613 */ 3614 static void sd_shutdown(struct device *dev) 3615 { 3616 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3617 3618 if (!sdkp) 3619 return; /* this can happen */ 3620 3621 if (pm_runtime_suspended(dev)) 3622 return; 3623 3624 if (sdkp->WCE && sdkp->media_present) { 3625 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3626 sd_sync_cache(sdkp, NULL); 3627 } 3628 3629 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 3630 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3631 sd_start_stop_device(sdkp, 0); 3632 } 3633 } 3634 3635 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors) 3636 { 3637 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3638 struct scsi_sense_hdr sshdr; 3639 int ret = 0; 3640 3641 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */ 3642 return 0; 3643 3644 if (sdkp->WCE && sdkp->media_present) { 3645 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3646 ret = sd_sync_cache(sdkp, &sshdr); 3647 3648 if (ret) { 3649 /* ignore OFFLINE device */ 3650 if (ret == -ENODEV) 3651 return 0; 3652 3653 if (!scsi_sense_valid(&sshdr) || 3654 sshdr.sense_key != ILLEGAL_REQUEST) 3655 return ret; 3656 3657 /* 3658 * sshdr.sense_key == ILLEGAL_REQUEST means this drive 3659 * doesn't support sync. There's not much to do and 3660 * suspend shouldn't fail. 3661 */ 3662 ret = 0; 3663 } 3664 } 3665 3666 if (sdkp->device->manage_start_stop) { 3667 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3668 /* an error is not worth aborting a system sleep */ 3669 ret = sd_start_stop_device(sdkp, 0); 3670 if (ignore_stop_errors) 3671 ret = 0; 3672 } 3673 3674 return ret; 3675 } 3676 3677 static int sd_suspend_system(struct device *dev) 3678 { 3679 return sd_suspend_common(dev, true); 3680 } 3681 3682 static int sd_suspend_runtime(struct device *dev) 3683 { 3684 return sd_suspend_common(dev, false); 3685 } 3686 3687 static int sd_resume(struct device *dev) 3688 { 3689 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3690 int ret; 3691 3692 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */ 3693 return 0; 3694 3695 if (!sdkp->device->manage_start_stop) 3696 return 0; 3697 3698 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 3699 ret = sd_start_stop_device(sdkp, 1); 3700 if (!ret) 3701 opal_unlock_from_suspend(sdkp->opal_dev); 3702 return ret; 3703 } 3704 3705 /** 3706 * init_sd - entry point for this driver (both when built in or when 3707 * a module). 3708 * 3709 * Note: this function registers this driver with the scsi mid-level. 3710 **/ 3711 static int __init init_sd(void) 3712 { 3713 int majors = 0, i, err; 3714 3715 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 3716 3717 for (i = 0; i < SD_MAJORS; i++) { 3718 if (__register_blkdev(sd_major(i), "sd", sd_default_probe)) 3719 continue; 3720 majors++; 3721 } 3722 3723 if (!majors) 3724 return -ENODEV; 3725 3726 err = class_register(&sd_disk_class); 3727 if (err) 3728 goto err_out; 3729 3730 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 3731 0, 0, NULL); 3732 if (!sd_cdb_cache) { 3733 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 3734 err = -ENOMEM; 3735 goto err_out_class; 3736 } 3737 3738 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 3739 if (!sd_cdb_pool) { 3740 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 3741 err = -ENOMEM; 3742 goto err_out_cache; 3743 } 3744 3745 sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0); 3746 if (!sd_page_pool) { 3747 printk(KERN_ERR "sd: can't init discard page pool\n"); 3748 err = -ENOMEM; 3749 goto err_out_ppool; 3750 } 3751 3752 err = scsi_register_driver(&sd_template.gendrv); 3753 if (err) 3754 goto err_out_driver; 3755 3756 return 0; 3757 3758 err_out_driver: 3759 mempool_destroy(sd_page_pool); 3760 3761 err_out_ppool: 3762 mempool_destroy(sd_cdb_pool); 3763 3764 err_out_cache: 3765 kmem_cache_destroy(sd_cdb_cache); 3766 3767 err_out_class: 3768 class_unregister(&sd_disk_class); 3769 err_out: 3770 for (i = 0; i < SD_MAJORS; i++) 3771 unregister_blkdev(sd_major(i), "sd"); 3772 return err; 3773 } 3774 3775 /** 3776 * exit_sd - exit point for this driver (when it is a module). 3777 * 3778 * Note: this function unregisters this driver from the scsi mid-level. 3779 **/ 3780 static void __exit exit_sd(void) 3781 { 3782 int i; 3783 3784 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 3785 3786 scsi_unregister_driver(&sd_template.gendrv); 3787 mempool_destroy(sd_cdb_pool); 3788 mempool_destroy(sd_page_pool); 3789 kmem_cache_destroy(sd_cdb_cache); 3790 3791 class_unregister(&sd_disk_class); 3792 3793 for (i = 0; i < SD_MAJORS; i++) 3794 unregister_blkdev(sd_major(i), "sd"); 3795 } 3796 3797 module_init(init_sd); 3798 module_exit(exit_sd); 3799 3800 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr) 3801 { 3802 scsi_print_sense_hdr(sdkp->device, 3803 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr); 3804 } 3805 3806 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result) 3807 { 3808 const char *hb_string = scsi_hostbyte_string(result); 3809 const char *db_string = scsi_driverbyte_string(result); 3810 3811 if (hb_string || db_string) 3812 sd_printk(KERN_INFO, sdkp, 3813 "%s: Result: hostbyte=%s driverbyte=%s\n", msg, 3814 hb_string ? hb_string : "invalid", 3815 db_string ? db_string : "invalid"); 3816 else 3817 sd_printk(KERN_INFO, sdkp, 3818 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n", 3819 msg, host_byte(result), driver_byte(result)); 3820 } 3821