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/bio-integrity.h> 37 #include <linux/module.h> 38 #include <linux/fs.h> 39 #include <linux/kernel.h> 40 #include <linux/mm.h> 41 #include <linux/hdreg.h> 42 #include <linux/errno.h> 43 #include <linux/idr.h> 44 #include <linux/interrupt.h> 45 #include <linux/init.h> 46 #include <linux/blkdev.h> 47 #include <linux/blkpg.h> 48 #include <linux/blk-pm.h> 49 #include <linux/delay.h> 50 #include <linux/rw_hint.h> 51 #include <linux/major.h> 52 #include <linux/mutex.h> 53 #include <linux/string_helpers.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 <linux/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_devinfo.h> 67 #include <scsi/scsi_driver.h> 68 #include <scsi/scsi_eh.h> 69 #include <scsi/scsi_host.h> 70 #include <scsi/scsi_ioctl.h> 71 #include <scsi/scsicam.h> 72 #include <scsi/scsi_common.h> 73 74 #include "sd.h" 75 #include "scsi_priv.h" 76 #include "scsi_logging.h" 77 78 MODULE_AUTHOR("Eric Youngdale"); 79 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 80 MODULE_LICENSE("GPL"); 81 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 94 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 95 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 96 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 97 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 98 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 99 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 100 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 101 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC); 102 103 #define SD_MINORS 16 104 105 static void sd_config_write_same(struct scsi_disk *sdkp, 106 struct queue_limits *lim); 107 static void sd_revalidate_disk(struct gendisk *); 108 109 static DEFINE_IDA(sd_index_ida); 110 static DEFINE_MUTEX(sd_mutex_lock); 111 112 static mempool_t *sd_page_pool; 113 static mempool_t *sd_large_page_pool; 114 static atomic_t sd_large_page_pool_users = ATOMIC_INIT(0); 115 static struct lock_class_key sd_bio_compl_lkclass; 116 117 static const char *sd_cache_types[] = { 118 "write through", "none", "write back", 119 "write back, no read (daft)" 120 }; 121 122 static int sd_large_pool_create(void) 123 { 124 mutex_lock(&sd_mutex_lock); 125 if (!sd_large_page_pool) { 126 sd_large_page_pool = mempool_create_page_pool( 127 SD_MEMPOOL_SIZE, get_order(BLK_MAX_BLOCK_SIZE)); 128 if (!sd_large_page_pool) { 129 printk(KERN_ERR "sd: can't create large page mempool\n"); 130 mutex_unlock(&sd_mutex_lock); 131 return -ENOMEM; 132 } 133 } 134 atomic_inc(&sd_large_page_pool_users); 135 mutex_unlock(&sd_mutex_lock); 136 return 0; 137 } 138 139 static void sd_large_pool_destroy(void) 140 { 141 mutex_lock(&sd_mutex_lock); 142 if (atomic_dec_and_test(&sd_large_page_pool_users)) { 143 mempool_destroy(sd_large_page_pool); 144 sd_large_page_pool = NULL; 145 } 146 mutex_unlock(&sd_mutex_lock); 147 } 148 149 static void sd_disable_discard(struct scsi_disk *sdkp) 150 { 151 sdkp->provisioning_mode = SD_LBP_DISABLE; 152 blk_queue_disable_discard(sdkp->disk->queue); 153 } 154 155 static void sd_config_discard(struct scsi_disk *sdkp, struct queue_limits *lim, 156 unsigned int mode) 157 { 158 unsigned int logical_block_size = sdkp->device->sector_size; 159 unsigned int max_blocks = 0; 160 161 lim->discard_alignment = sdkp->unmap_alignment * logical_block_size; 162 lim->discard_granularity = max(sdkp->physical_block_size, 163 sdkp->unmap_granularity * logical_block_size); 164 sdkp->provisioning_mode = mode; 165 166 switch (mode) { 167 168 case SD_LBP_FULL: 169 case SD_LBP_DISABLE: 170 break; 171 172 case SD_LBP_UNMAP: 173 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 174 (u32)SD_MAX_WS16_BLOCKS); 175 break; 176 177 case SD_LBP_WS16: 178 if (sdkp->device->unmap_limit_for_ws) 179 max_blocks = sdkp->max_unmap_blocks; 180 else 181 max_blocks = sdkp->max_ws_blocks; 182 183 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS); 184 break; 185 186 case SD_LBP_WS10: 187 if (sdkp->device->unmap_limit_for_ws) 188 max_blocks = sdkp->max_unmap_blocks; 189 else 190 max_blocks = sdkp->max_ws_blocks; 191 192 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS); 193 break; 194 195 case SD_LBP_ZERO: 196 max_blocks = min_not_zero(sdkp->max_ws_blocks, 197 (u32)SD_MAX_WS10_BLOCKS); 198 break; 199 } 200 201 lim->max_hw_discard_sectors = max_blocks * 202 (logical_block_size >> SECTOR_SHIFT); 203 } 204 205 static void sd_set_flush_flag(struct scsi_disk *sdkp, 206 struct queue_limits *lim) 207 { 208 if (sdkp->WCE) { 209 lim->features |= BLK_FEAT_WRITE_CACHE; 210 if (sdkp->DPOFUA) 211 lim->features |= BLK_FEAT_FUA; 212 else 213 lim->features &= ~BLK_FEAT_FUA; 214 } else { 215 lim->features &= ~(BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA); 216 } 217 } 218 219 static ssize_t 220 cache_type_store(struct device *dev, struct device_attribute *attr, 221 const char *buf, size_t count) 222 { 223 int ct, rcd, wce, sp; 224 struct scsi_disk *sdkp = to_scsi_disk(dev); 225 struct scsi_device *sdp = sdkp->device; 226 char buffer[64]; 227 char *buffer_data; 228 struct scsi_mode_data data; 229 struct scsi_sense_hdr sshdr; 230 static const char temp[] = "temporary "; 231 int len, ret; 232 233 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 234 /* no cache control on RBC devices; theoretically they 235 * can do it, but there's probably so many exceptions 236 * it's not worth the risk */ 237 return -EINVAL; 238 239 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { 240 buf += sizeof(temp) - 1; 241 sdkp->cache_override = 1; 242 } else { 243 sdkp->cache_override = 0; 244 } 245 246 ct = sysfs_match_string(sd_cache_types, buf); 247 if (ct < 0) 248 return -EINVAL; 249 250 rcd = ct & 0x01 ? 1 : 0; 251 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0; 252 253 if (sdkp->cache_override) { 254 struct queue_limits lim; 255 256 sdkp->WCE = wce; 257 sdkp->RCD = rcd; 258 259 lim = queue_limits_start_update(sdkp->disk->queue); 260 sd_set_flush_flag(sdkp, &lim); 261 ret = queue_limits_commit_update_frozen(sdkp->disk->queue, 262 &lim); 263 if (ret) 264 return ret; 265 return count; 266 } 267 268 if (scsi_mode_sense(sdp, 0x08, 8, 0, buffer, sizeof(buffer), SD_TIMEOUT, 269 sdkp->max_retries, &data, NULL)) 270 return -EINVAL; 271 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 272 data.block_descriptor_length); 273 buffer_data = buffer + data.header_length + 274 data.block_descriptor_length; 275 buffer_data[2] &= ~0x05; 276 buffer_data[2] |= wce << 2 | rcd; 277 sp = buffer_data[0] & 0x80 ? 1 : 0; 278 buffer_data[0] &= ~0x80; 279 280 /* 281 * Ensure WP, DPOFUA, and RESERVED fields are cleared in 282 * received mode parameter buffer before doing MODE SELECT. 283 */ 284 data.device_specific = 0; 285 286 ret = scsi_mode_select(sdp, 1, sp, buffer_data, len, SD_TIMEOUT, 287 sdkp->max_retries, &data, &sshdr); 288 if (ret) { 289 if (ret > 0 && scsi_sense_valid(&sshdr)) 290 sd_print_sense_hdr(sdkp, &sshdr); 291 return -EINVAL; 292 } 293 sd_revalidate_disk(sdkp->disk); 294 return count; 295 } 296 297 static ssize_t 298 manage_start_stop_show(struct device *dev, 299 struct device_attribute *attr, char *buf) 300 { 301 struct scsi_disk *sdkp = to_scsi_disk(dev); 302 struct scsi_device *sdp = sdkp->device; 303 304 return sysfs_emit(buf, "%u\n", 305 sdp->manage_system_start_stop && 306 sdp->manage_runtime_start_stop && 307 sdp->manage_shutdown); 308 } 309 static DEVICE_ATTR_RO(manage_start_stop); 310 311 static ssize_t 312 manage_system_start_stop_show(struct device *dev, 313 struct device_attribute *attr, char *buf) 314 { 315 struct scsi_disk *sdkp = to_scsi_disk(dev); 316 struct scsi_device *sdp = sdkp->device; 317 318 return sysfs_emit(buf, "%u\n", sdp->manage_system_start_stop); 319 } 320 321 static ssize_t 322 manage_system_start_stop_store(struct device *dev, 323 struct device_attribute *attr, 324 const char *buf, size_t count) 325 { 326 struct scsi_disk *sdkp = to_scsi_disk(dev); 327 struct scsi_device *sdp = sdkp->device; 328 bool v; 329 330 if (!capable(CAP_SYS_ADMIN)) 331 return -EACCES; 332 333 if (kstrtobool(buf, &v)) 334 return -EINVAL; 335 336 sdp->manage_system_start_stop = v; 337 338 return count; 339 } 340 static DEVICE_ATTR_RW(manage_system_start_stop); 341 342 static ssize_t 343 manage_runtime_start_stop_show(struct device *dev, 344 struct device_attribute *attr, char *buf) 345 { 346 struct scsi_disk *sdkp = to_scsi_disk(dev); 347 struct scsi_device *sdp = sdkp->device; 348 349 return sysfs_emit(buf, "%u\n", sdp->manage_runtime_start_stop); 350 } 351 352 static ssize_t 353 manage_runtime_start_stop_store(struct device *dev, 354 struct device_attribute *attr, 355 const char *buf, size_t count) 356 { 357 struct scsi_disk *sdkp = to_scsi_disk(dev); 358 struct scsi_device *sdp = sdkp->device; 359 bool v; 360 361 if (!capable(CAP_SYS_ADMIN)) 362 return -EACCES; 363 364 if (kstrtobool(buf, &v)) 365 return -EINVAL; 366 367 sdp->manage_runtime_start_stop = v; 368 369 return count; 370 } 371 static DEVICE_ATTR_RW(manage_runtime_start_stop); 372 373 static ssize_t manage_shutdown_show(struct device *dev, 374 struct device_attribute *attr, char *buf) 375 { 376 struct scsi_disk *sdkp = to_scsi_disk(dev); 377 struct scsi_device *sdp = sdkp->device; 378 379 return sysfs_emit(buf, "%u\n", sdp->manage_shutdown); 380 } 381 382 static ssize_t manage_shutdown_store(struct device *dev, 383 struct device_attribute *attr, 384 const char *buf, size_t count) 385 { 386 struct scsi_disk *sdkp = to_scsi_disk(dev); 387 struct scsi_device *sdp = sdkp->device; 388 bool v; 389 390 if (!capable(CAP_SYS_ADMIN)) 391 return -EACCES; 392 393 if (kstrtobool(buf, &v)) 394 return -EINVAL; 395 396 sdp->manage_shutdown = v; 397 398 return count; 399 } 400 static DEVICE_ATTR_RW(manage_shutdown); 401 402 static ssize_t manage_restart_show(struct device *dev, 403 struct device_attribute *attr, char *buf) 404 { 405 struct scsi_disk *sdkp = to_scsi_disk(dev); 406 struct scsi_device *sdp = sdkp->device; 407 408 return sysfs_emit(buf, "%u\n", sdp->manage_restart); 409 } 410 411 static ssize_t manage_restart_store(struct device *dev, 412 struct device_attribute *attr, 413 const char *buf, size_t count) 414 { 415 struct scsi_disk *sdkp = to_scsi_disk(dev); 416 struct scsi_device *sdp = sdkp->device; 417 bool v; 418 419 if (!capable(CAP_SYS_ADMIN)) 420 return -EACCES; 421 422 if (kstrtobool(buf, &v)) 423 return -EINVAL; 424 425 sdp->manage_restart = v; 426 427 return count; 428 } 429 static DEVICE_ATTR_RW(manage_restart); 430 431 static ssize_t 432 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf) 433 { 434 struct scsi_disk *sdkp = to_scsi_disk(dev); 435 436 return sprintf(buf, "%u\n", sdkp->device->allow_restart); 437 } 438 439 static ssize_t 440 allow_restart_store(struct device *dev, struct device_attribute *attr, 441 const char *buf, size_t count) 442 { 443 bool v; 444 struct scsi_disk *sdkp = to_scsi_disk(dev); 445 struct scsi_device *sdp = sdkp->device; 446 447 if (!capable(CAP_SYS_ADMIN)) 448 return -EACCES; 449 450 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 451 return -EINVAL; 452 453 if (kstrtobool(buf, &v)) 454 return -EINVAL; 455 456 sdp->allow_restart = v; 457 458 return count; 459 } 460 static DEVICE_ATTR_RW(allow_restart); 461 462 static ssize_t 463 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) 464 { 465 struct scsi_disk *sdkp = to_scsi_disk(dev); 466 int ct = sdkp->RCD + 2*sdkp->WCE; 467 468 return sprintf(buf, "%s\n", sd_cache_types[ct]); 469 } 470 static DEVICE_ATTR_RW(cache_type); 471 472 static ssize_t 473 FUA_show(struct device *dev, struct device_attribute *attr, char *buf) 474 { 475 struct scsi_disk *sdkp = to_scsi_disk(dev); 476 477 return sprintf(buf, "%u\n", sdkp->DPOFUA); 478 } 479 static DEVICE_ATTR_RO(FUA); 480 481 static ssize_t 482 protection_type_show(struct device *dev, struct device_attribute *attr, 483 char *buf) 484 { 485 struct scsi_disk *sdkp = to_scsi_disk(dev); 486 487 return sprintf(buf, "%u\n", sdkp->protection_type); 488 } 489 490 static ssize_t 491 protection_type_store(struct device *dev, struct device_attribute *attr, 492 const char *buf, size_t count) 493 { 494 struct scsi_disk *sdkp = to_scsi_disk(dev); 495 unsigned int val; 496 int err; 497 498 if (!capable(CAP_SYS_ADMIN)) 499 return -EACCES; 500 501 err = kstrtouint(buf, 10, &val); 502 503 if (err) 504 return err; 505 506 if (val <= T10_PI_TYPE3_PROTECTION) 507 sdkp->protection_type = val; 508 509 return count; 510 } 511 static DEVICE_ATTR_RW(protection_type); 512 513 static ssize_t 514 protection_mode_show(struct device *dev, struct device_attribute *attr, 515 char *buf) 516 { 517 struct scsi_disk *sdkp = to_scsi_disk(dev); 518 struct scsi_device *sdp = sdkp->device; 519 unsigned int dif, dix; 520 521 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 522 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); 523 524 if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) { 525 dif = 0; 526 dix = 1; 527 } 528 529 if (!dif && !dix) 530 return sprintf(buf, "none\n"); 531 532 return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif); 533 } 534 static DEVICE_ATTR_RO(protection_mode); 535 536 static ssize_t 537 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf) 538 { 539 struct scsi_disk *sdkp = to_scsi_disk(dev); 540 541 return sprintf(buf, "%u\n", sdkp->ATO); 542 } 543 static DEVICE_ATTR_RO(app_tag_own); 544 545 static ssize_t 546 thin_provisioning_show(struct device *dev, struct device_attribute *attr, 547 char *buf) 548 { 549 struct scsi_disk *sdkp = to_scsi_disk(dev); 550 551 return sprintf(buf, "%u\n", sdkp->lbpme); 552 } 553 static DEVICE_ATTR_RO(thin_provisioning); 554 555 /* sysfs_match_string() requires dense arrays */ 556 static const char *lbp_mode[] = { 557 [SD_LBP_FULL] = "full", 558 [SD_LBP_UNMAP] = "unmap", 559 [SD_LBP_WS16] = "writesame_16", 560 [SD_LBP_WS10] = "writesame_10", 561 [SD_LBP_ZERO] = "writesame_zero", 562 [SD_LBP_DISABLE] = "disabled", 563 }; 564 565 static ssize_t 566 provisioning_mode_show(struct device *dev, struct device_attribute *attr, 567 char *buf) 568 { 569 struct scsi_disk *sdkp = to_scsi_disk(dev); 570 571 return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]); 572 } 573 574 static ssize_t 575 provisioning_mode_store(struct device *dev, struct device_attribute *attr, 576 const char *buf, size_t count) 577 { 578 struct scsi_disk *sdkp = to_scsi_disk(dev); 579 struct scsi_device *sdp = sdkp->device; 580 struct queue_limits lim; 581 int mode, err; 582 583 if (!capable(CAP_SYS_ADMIN)) 584 return -EACCES; 585 586 if (sdp->type != TYPE_DISK) 587 return -EINVAL; 588 589 mode = sysfs_match_string(lbp_mode, buf); 590 if (mode < 0) 591 return -EINVAL; 592 593 lim = queue_limits_start_update(sdkp->disk->queue); 594 sd_config_discard(sdkp, &lim, mode); 595 err = queue_limits_commit_update_frozen(sdkp->disk->queue, &lim); 596 if (err) 597 return err; 598 return count; 599 } 600 static DEVICE_ATTR_RW(provisioning_mode); 601 602 /* sysfs_match_string() requires dense arrays */ 603 static const char *zeroing_mode[] = { 604 [SD_ZERO_WRITE] = "write", 605 [SD_ZERO_WS] = "writesame", 606 [SD_ZERO_WS16_UNMAP] = "writesame_16_unmap", 607 [SD_ZERO_WS10_UNMAP] = "writesame_10_unmap", 608 }; 609 610 static ssize_t 611 zeroing_mode_show(struct device *dev, struct device_attribute *attr, 612 char *buf) 613 { 614 struct scsi_disk *sdkp = to_scsi_disk(dev); 615 616 return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]); 617 } 618 619 static ssize_t 620 zeroing_mode_store(struct device *dev, struct device_attribute *attr, 621 const char *buf, size_t count) 622 { 623 struct scsi_disk *sdkp = to_scsi_disk(dev); 624 int mode; 625 626 if (!capable(CAP_SYS_ADMIN)) 627 return -EACCES; 628 629 mode = sysfs_match_string(zeroing_mode, buf); 630 if (mode < 0) 631 return -EINVAL; 632 633 sdkp->zeroing_mode = mode; 634 635 return count; 636 } 637 static DEVICE_ATTR_RW(zeroing_mode); 638 639 static ssize_t 640 max_medium_access_timeouts_show(struct device *dev, 641 struct device_attribute *attr, char *buf) 642 { 643 struct scsi_disk *sdkp = to_scsi_disk(dev); 644 645 return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts); 646 } 647 648 static ssize_t 649 max_medium_access_timeouts_store(struct device *dev, 650 struct device_attribute *attr, const char *buf, 651 size_t count) 652 { 653 struct scsi_disk *sdkp = to_scsi_disk(dev); 654 int err; 655 656 if (!capable(CAP_SYS_ADMIN)) 657 return -EACCES; 658 659 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); 660 661 return err ? err : count; 662 } 663 static DEVICE_ATTR_RW(max_medium_access_timeouts); 664 665 static ssize_t 666 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr, 667 char *buf) 668 { 669 struct scsi_disk *sdkp = to_scsi_disk(dev); 670 671 return sprintf(buf, "%u\n", sdkp->max_ws_blocks); 672 } 673 674 static ssize_t 675 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr, 676 const char *buf, size_t count) 677 { 678 struct scsi_disk *sdkp = to_scsi_disk(dev); 679 struct scsi_device *sdp = sdkp->device; 680 struct queue_limits lim; 681 unsigned long max; 682 int err; 683 684 if (!capable(CAP_SYS_ADMIN)) 685 return -EACCES; 686 687 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 688 return -EINVAL; 689 690 err = kstrtoul(buf, 10, &max); 691 692 if (err) 693 return err; 694 695 if (max == 0) 696 sdp->no_write_same = 1; 697 else if (max <= SD_MAX_WS16_BLOCKS) { 698 sdp->no_write_same = 0; 699 sdkp->max_ws_blocks = max; 700 } 701 702 lim = queue_limits_start_update(sdkp->disk->queue); 703 sd_config_write_same(sdkp, &lim); 704 err = queue_limits_commit_update_frozen(sdkp->disk->queue, &lim); 705 if (err) 706 return err; 707 return count; 708 } 709 static DEVICE_ATTR_RW(max_write_same_blocks); 710 711 static ssize_t 712 zoned_cap_show(struct device *dev, struct device_attribute *attr, char *buf) 713 { 714 struct scsi_disk *sdkp = to_scsi_disk(dev); 715 716 if (sdkp->device->type == TYPE_ZBC) 717 return sprintf(buf, "host-managed\n"); 718 if (sdkp->zoned == 1) 719 return sprintf(buf, "host-aware\n"); 720 if (sdkp->zoned == 2) 721 return sprintf(buf, "drive-managed\n"); 722 return sprintf(buf, "none\n"); 723 } 724 static DEVICE_ATTR_RO(zoned_cap); 725 726 static ssize_t 727 max_retries_store(struct device *dev, struct device_attribute *attr, 728 const char *buf, size_t count) 729 { 730 struct scsi_disk *sdkp = to_scsi_disk(dev); 731 struct scsi_device *sdev = sdkp->device; 732 int retries, err; 733 734 err = kstrtoint(buf, 10, &retries); 735 if (err) 736 return err; 737 738 if (retries == SCSI_CMD_RETRIES_NO_LIMIT || retries <= SD_MAX_RETRIES) { 739 sdkp->max_retries = retries; 740 return count; 741 } 742 743 sdev_printk(KERN_ERR, sdev, "max_retries must be between -1 and %d\n", 744 SD_MAX_RETRIES); 745 return -EINVAL; 746 } 747 748 static ssize_t 749 max_retries_show(struct device *dev, struct device_attribute *attr, 750 char *buf) 751 { 752 struct scsi_disk *sdkp = to_scsi_disk(dev); 753 754 return sprintf(buf, "%d\n", sdkp->max_retries); 755 } 756 757 static DEVICE_ATTR_RW(max_retries); 758 759 static struct attribute *sd_disk_attrs[] = { 760 &dev_attr_cache_type.attr, 761 &dev_attr_FUA.attr, 762 &dev_attr_allow_restart.attr, 763 &dev_attr_manage_start_stop.attr, 764 &dev_attr_manage_system_start_stop.attr, 765 &dev_attr_manage_runtime_start_stop.attr, 766 &dev_attr_manage_shutdown.attr, 767 &dev_attr_manage_restart.attr, 768 &dev_attr_protection_type.attr, 769 &dev_attr_protection_mode.attr, 770 &dev_attr_app_tag_own.attr, 771 &dev_attr_thin_provisioning.attr, 772 &dev_attr_provisioning_mode.attr, 773 &dev_attr_zeroing_mode.attr, 774 &dev_attr_max_write_same_blocks.attr, 775 &dev_attr_max_medium_access_timeouts.attr, 776 &dev_attr_zoned_cap.attr, 777 &dev_attr_max_retries.attr, 778 NULL, 779 }; 780 ATTRIBUTE_GROUPS(sd_disk); 781 782 static void scsi_disk_release(struct device *dev) 783 { 784 struct scsi_disk *sdkp = to_scsi_disk(dev); 785 786 ida_free(&sd_index_ida, sdkp->index); 787 put_device(&sdkp->device->sdev_gendev); 788 free_opal_dev(sdkp->opal_dev); 789 790 kfree(sdkp); 791 } 792 793 static struct class sd_disk_class = { 794 .name = "scsi_disk", 795 .dev_release = scsi_disk_release, 796 .dev_groups = sd_disk_groups, 797 }; 798 799 /* 800 * Don't request a new module, as that could deadlock in multipath 801 * environment. 802 */ 803 static void sd_default_probe(dev_t devt) 804 { 805 } 806 807 /* 808 * Device no to disk mapping: 809 * 810 * major disc2 disc p1 811 * |............|.............|....|....| <- dev_t 812 * 31 20 19 8 7 4 3 0 813 * 814 * Inside a major, we have 16k disks, however mapped non- 815 * contiguously. The first 16 disks are for major0, the next 816 * ones with major1, ... Disk 256 is for major0 again, disk 272 817 * for major1, ... 818 * As we stay compatible with our numbering scheme, we can reuse 819 * the well-know SCSI majors 8, 65--71, 136--143. 820 */ 821 static int sd_major(int major_idx) 822 { 823 switch (major_idx) { 824 case 0: 825 return SCSI_DISK0_MAJOR; 826 case 1 ... 7: 827 return SCSI_DISK1_MAJOR + major_idx - 1; 828 case 8 ... 15: 829 return SCSI_DISK8_MAJOR + major_idx - 8; 830 default: 831 BUG(); 832 return 0; /* shut up gcc */ 833 } 834 } 835 836 #ifdef CONFIG_BLK_SED_OPAL 837 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, 838 size_t len, bool send) 839 { 840 struct scsi_disk *sdkp = data; 841 struct scsi_device *sdev = sdkp->device; 842 u8 cdb[12] = { 0, }; 843 const struct scsi_exec_args exec_args = { 844 .req_flags = BLK_MQ_REQ_PM, 845 }; 846 int ret; 847 848 cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN; 849 cdb[1] = secp; 850 put_unaligned_be16(spsp, &cdb[2]); 851 put_unaligned_be32(len, &cdb[6]); 852 853 ret = scsi_execute_cmd(sdev, cdb, send ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 854 buffer, len, SD_TIMEOUT, sdkp->max_retries, 855 &exec_args); 856 return ret <= 0 ? ret : -EIO; 857 } 858 #endif /* CONFIG_BLK_SED_OPAL */ 859 860 /* 861 * Look up the DIX operation based on whether the command is read or 862 * write and whether dix and dif are enabled. 863 */ 864 static unsigned int sd_prot_op(bool write, bool dix, bool dif) 865 { 866 /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */ 867 static const unsigned int ops[] = { /* wrt dix dif */ 868 SCSI_PROT_NORMAL, /* 0 0 0 */ 869 SCSI_PROT_READ_STRIP, /* 0 0 1 */ 870 SCSI_PROT_READ_INSERT, /* 0 1 0 */ 871 SCSI_PROT_READ_PASS, /* 0 1 1 */ 872 SCSI_PROT_NORMAL, /* 1 0 0 */ 873 SCSI_PROT_WRITE_INSERT, /* 1 0 1 */ 874 SCSI_PROT_WRITE_STRIP, /* 1 1 0 */ 875 SCSI_PROT_WRITE_PASS, /* 1 1 1 */ 876 }; 877 878 return ops[write << 2 | dix << 1 | dif]; 879 } 880 881 /* 882 * Returns a mask of the protection flags that are valid for a given DIX 883 * operation. 884 */ 885 static unsigned int sd_prot_flag_mask(unsigned int prot_op) 886 { 887 static const unsigned int flag_mask[] = { 888 [SCSI_PROT_NORMAL] = 0, 889 890 [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI | 891 SCSI_PROT_GUARD_CHECK | 892 SCSI_PROT_REF_CHECK | 893 SCSI_PROT_REF_INCREMENT, 894 895 [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT | 896 SCSI_PROT_IP_CHECKSUM, 897 898 [SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI | 899 SCSI_PROT_GUARD_CHECK | 900 SCSI_PROT_REF_CHECK | 901 SCSI_PROT_REF_INCREMENT | 902 SCSI_PROT_IP_CHECKSUM, 903 904 [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI | 905 SCSI_PROT_REF_INCREMENT, 906 907 [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK | 908 SCSI_PROT_REF_CHECK | 909 SCSI_PROT_REF_INCREMENT | 910 SCSI_PROT_IP_CHECKSUM, 911 912 [SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI | 913 SCSI_PROT_GUARD_CHECK | 914 SCSI_PROT_REF_CHECK | 915 SCSI_PROT_REF_INCREMENT | 916 SCSI_PROT_IP_CHECKSUM, 917 }; 918 919 return flag_mask[prot_op]; 920 } 921 922 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd, 923 unsigned int dix, unsigned int dif) 924 { 925 struct request *rq = scsi_cmd_to_rq(scmd); 926 struct bio *bio = rq->bio; 927 unsigned int prot_op = sd_prot_op(rq_data_dir(rq), dix, dif); 928 unsigned int protect = 0; 929 930 if (dix) { /* DIX Type 0, 1, 2, 3 */ 931 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM)) 932 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM; 933 934 if (bio_integrity_flagged(bio, BIP_CHECK_GUARD)) 935 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK; 936 } 937 938 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */ 939 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT; 940 941 if (bio_integrity_flagged(bio, BIP_CHECK_REFTAG)) 942 scmd->prot_flags |= SCSI_PROT_REF_CHECK; 943 } 944 945 if (dif) { /* DIX/DIF Type 1, 2, 3 */ 946 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI; 947 948 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK)) 949 protect = 3 << 5; /* Disable target PI checking */ 950 else 951 protect = 1 << 5; /* Enable target PI checking */ 952 } 953 954 scsi_set_prot_op(scmd, prot_op); 955 scsi_set_prot_type(scmd, dif); 956 scmd->prot_flags &= sd_prot_flag_mask(prot_op); 957 958 return protect; 959 } 960 961 static void sd_uninit_command(struct scsi_cmnd *cmd) 962 { 963 struct request *rq = scsi_cmd_to_rq(cmd); 964 struct scsi_device *sdp = cmd->device; 965 966 if (!(rq->rq_flags & RQF_SPECIAL_PAYLOAD)) 967 return; 968 969 if (sdp->sector_size > PAGE_SIZE) 970 mempool_free(rq->special_vec.bv_page, sd_large_page_pool); 971 else 972 mempool_free(rq->special_vec.bv_page, sd_page_pool); 973 rq->rq_flags &= ~RQF_SPECIAL_PAYLOAD; 974 } 975 976 static void *sd_set_special_bvec(struct scsi_cmnd *cmd, unsigned int data_len) 977 { 978 struct page *page; 979 struct request *rq = scsi_cmd_to_rq(cmd); 980 struct scsi_device *sdp = cmd->device; 981 unsigned sector_size = sdp->sector_size; 982 unsigned int nr_pages = DIV_ROUND_UP(sector_size, PAGE_SIZE); 983 int n; 984 985 if (sector_size > PAGE_SIZE) 986 page = mempool_alloc(sd_large_page_pool, GFP_ATOMIC); 987 else 988 page = mempool_alloc(sd_page_pool, GFP_ATOMIC); 989 if (!page) 990 return NULL; 991 992 for (n = 0; n < nr_pages; n++) 993 clear_highpage(page + n); 994 bvec_set_page(&rq->special_vec, page, data_len, 0); 995 rq->rq_flags |= RQF_SPECIAL_PAYLOAD; 996 return bvec_virt(&rq->special_vec); 997 } 998 999 static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd) 1000 { 1001 struct scsi_device *sdp = cmd->device; 1002 struct request *rq = scsi_cmd_to_rq(cmd); 1003 struct scsi_disk *sdkp = scsi_disk(rq->q->disk); 1004 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 1005 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 1006 unsigned int data_len = 24; 1007 char *buf; 1008 blk_status_t ret; 1009 1010 buf = sd_set_special_bvec(cmd, data_len); 1011 if (!buf) 1012 return BLK_STS_RESOURCE; 1013 1014 cmd->cmd_len = 10; 1015 cmd->cmnd[0] = UNMAP; 1016 cmd->cmnd[8] = 24; 1017 1018 put_unaligned_be16(6 + 16, &buf[0]); 1019 put_unaligned_be16(16, &buf[2]); 1020 put_unaligned_be64(lba, &buf[8]); 1021 put_unaligned_be32(nr_blocks, &buf[16]); 1022 1023 cmd->allowed = sdkp->max_retries; 1024 cmd->transfersize = data_len; 1025 rq->timeout = SD_TIMEOUT; 1026 1027 ret = scsi_alloc_sgtables(cmd); 1028 if (ret != BLK_STS_OK) 1029 sd_uninit_command(cmd); 1030 return ret; 1031 } 1032 1033 static void sd_config_atomic(struct scsi_disk *sdkp, struct queue_limits *lim) 1034 { 1035 unsigned int logical_block_size = sdkp->device->sector_size, 1036 physical_block_size_sectors, max_atomic, unit_min, unit_max; 1037 1038 if ((!sdkp->max_atomic && !sdkp->max_atomic_with_boundary) || 1039 sdkp->protection_type == T10_PI_TYPE2_PROTECTION) 1040 return; 1041 1042 physical_block_size_sectors = sdkp->physical_block_size / 1043 sdkp->device->sector_size; 1044 1045 unit_min = rounddown_pow_of_two(sdkp->atomic_granularity ? 1046 sdkp->atomic_granularity : 1047 physical_block_size_sectors); 1048 1049 /* 1050 * Only use atomic boundary when we have the odd scenario of 1051 * sdkp->max_atomic == 0, which the spec does permit. 1052 */ 1053 if (sdkp->max_atomic) { 1054 max_atomic = sdkp->max_atomic; 1055 unit_max = rounddown_pow_of_two(sdkp->max_atomic); 1056 sdkp->use_atomic_write_boundary = 0; 1057 } else { 1058 max_atomic = sdkp->max_atomic_with_boundary; 1059 unit_max = rounddown_pow_of_two(sdkp->max_atomic_boundary); 1060 sdkp->use_atomic_write_boundary = 1; 1061 } 1062 1063 /* 1064 * Ensure compliance with granularity and alignment. For now, keep it 1065 * simple and just don't support atomic writes for values mismatched 1066 * with max_{boundary}atomic, physical block size, and 1067 * atomic_granularity itself. 1068 * 1069 * We're really being distrustful by checking unit_max also... 1070 */ 1071 if (sdkp->atomic_granularity > 1) { 1072 if (unit_min > 1 && unit_min % sdkp->atomic_granularity) 1073 return; 1074 if (unit_max > 1 && unit_max % sdkp->atomic_granularity) 1075 return; 1076 } 1077 1078 if (sdkp->atomic_alignment > 1) { 1079 if (unit_min > 1 && unit_min % sdkp->atomic_alignment) 1080 return; 1081 if (unit_max > 1 && unit_max % sdkp->atomic_alignment) 1082 return; 1083 } 1084 1085 lim->atomic_write_hw_max = max_atomic * logical_block_size; 1086 lim->atomic_write_hw_boundary = 0; 1087 lim->atomic_write_hw_unit_min = unit_min * logical_block_size; 1088 lim->atomic_write_hw_unit_max = unit_max * logical_block_size; 1089 lim->features |= BLK_FEAT_ATOMIC_WRITES; 1090 } 1091 1092 static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, 1093 bool unmap) 1094 { 1095 struct scsi_device *sdp = cmd->device; 1096 struct request *rq = scsi_cmd_to_rq(cmd); 1097 struct scsi_disk *sdkp = scsi_disk(rq->q->disk); 1098 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 1099 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 1100 u32 data_len = sdp->sector_size; 1101 blk_status_t ret; 1102 1103 if (!sd_set_special_bvec(cmd, data_len)) 1104 return BLK_STS_RESOURCE; 1105 1106 cmd->cmd_len = 16; 1107 cmd->cmnd[0] = WRITE_SAME_16; 1108 if (unmap) 1109 cmd->cmnd[1] = 0x8; /* UNMAP */ 1110 put_unaligned_be64(lba, &cmd->cmnd[2]); 1111 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]); 1112 1113 cmd->allowed = sdkp->max_retries; 1114 cmd->transfersize = data_len; 1115 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT; 1116 1117 ret = scsi_alloc_sgtables(cmd); 1118 if (ret != BLK_STS_OK) 1119 sd_uninit_command(cmd); 1120 return ret; 1121 } 1122 1123 static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, 1124 bool unmap) 1125 { 1126 struct scsi_device *sdp = cmd->device; 1127 struct request *rq = scsi_cmd_to_rq(cmd); 1128 struct scsi_disk *sdkp = scsi_disk(rq->q->disk); 1129 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 1130 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 1131 u32 data_len = sdp->sector_size; 1132 blk_status_t ret; 1133 1134 if (!sd_set_special_bvec(cmd, data_len)) 1135 return BLK_STS_RESOURCE; 1136 1137 cmd->cmd_len = 10; 1138 cmd->cmnd[0] = WRITE_SAME; 1139 if (unmap) 1140 cmd->cmnd[1] = 0x8; /* UNMAP */ 1141 put_unaligned_be32(lba, &cmd->cmnd[2]); 1142 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]); 1143 1144 cmd->allowed = sdkp->max_retries; 1145 cmd->transfersize = data_len; 1146 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT; 1147 1148 ret = scsi_alloc_sgtables(cmd); 1149 if (ret != BLK_STS_OK) 1150 sd_uninit_command(cmd); 1151 return ret; 1152 } 1153 1154 static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd) 1155 { 1156 struct request *rq = scsi_cmd_to_rq(cmd); 1157 struct scsi_device *sdp = cmd->device; 1158 struct scsi_disk *sdkp = scsi_disk(rq->q->disk); 1159 u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 1160 u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 1161 1162 if (!(rq->cmd_flags & REQ_NOUNMAP)) { 1163 switch (sdkp->zeroing_mode) { 1164 case SD_ZERO_WS16_UNMAP: 1165 return sd_setup_write_same16_cmnd(cmd, true); 1166 case SD_ZERO_WS10_UNMAP: 1167 return sd_setup_write_same10_cmnd(cmd, true); 1168 } 1169 } 1170 1171 if (sdp->no_write_same) { 1172 rq->rq_flags |= RQF_QUIET; 1173 return BLK_STS_TARGET; 1174 } 1175 1176 if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) 1177 return sd_setup_write_same16_cmnd(cmd, false); 1178 1179 return sd_setup_write_same10_cmnd(cmd, false); 1180 } 1181 1182 static void sd_disable_write_same(struct scsi_disk *sdkp) 1183 { 1184 sdkp->device->no_write_same = 1; 1185 sdkp->max_ws_blocks = 0; 1186 blk_queue_disable_write_zeroes(sdkp->disk->queue); 1187 } 1188 1189 static void sd_config_write_same(struct scsi_disk *sdkp, 1190 struct queue_limits *lim) 1191 { 1192 unsigned int logical_block_size = sdkp->device->sector_size; 1193 1194 if (sdkp->device->no_write_same) { 1195 sdkp->max_ws_blocks = 0; 1196 goto out; 1197 } 1198 1199 /* Some devices can not handle block counts above 0xffff despite 1200 * supporting WRITE SAME(16). Consequently we default to 64k 1201 * blocks per I/O unless the device explicitly advertises a 1202 * bigger limit. 1203 */ 1204 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) 1205 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 1206 (u32)SD_MAX_WS16_BLOCKS); 1207 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes) 1208 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 1209 (u32)SD_MAX_WS10_BLOCKS); 1210 else { 1211 sdkp->device->no_write_same = 1; 1212 sdkp->max_ws_blocks = 0; 1213 } 1214 1215 if (sdkp->lbprz && sdkp->lbpws) 1216 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP; 1217 else if (sdkp->lbprz && sdkp->lbpws10) 1218 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP; 1219 else if (sdkp->max_ws_blocks) 1220 sdkp->zeroing_mode = SD_ZERO_WS; 1221 else 1222 sdkp->zeroing_mode = SD_ZERO_WRITE; 1223 1224 if (sdkp->max_ws_blocks && 1225 sdkp->physical_block_size > logical_block_size) { 1226 /* 1227 * Reporting a maximum number of blocks that is not aligned 1228 * on the device physical size would cause a large write same 1229 * request to be split into physically unaligned chunks by 1230 * __blkdev_issue_write_zeroes() even if the caller of this 1231 * functions took care to align the large request. So make sure 1232 * the maximum reported is aligned to the device physical block 1233 * size. This is only an optional optimization for regular 1234 * disks, but this is mandatory to avoid failure of large write 1235 * same requests directed at sequential write required zones of 1236 * host-managed ZBC disks. 1237 */ 1238 sdkp->max_ws_blocks = 1239 round_down(sdkp->max_ws_blocks, 1240 bytes_to_logical(sdkp->device, 1241 sdkp->physical_block_size)); 1242 } 1243 1244 out: 1245 lim->max_write_zeroes_sectors = 1246 sdkp->max_ws_blocks * (logical_block_size >> SECTOR_SHIFT); 1247 1248 if (sdkp->zeroing_mode == SD_ZERO_WS16_UNMAP || 1249 sdkp->zeroing_mode == SD_ZERO_WS10_UNMAP) 1250 lim->max_hw_wzeroes_unmap_sectors = 1251 lim->max_write_zeroes_sectors; 1252 } 1253 1254 static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd) 1255 { 1256 struct request *rq = scsi_cmd_to_rq(cmd); 1257 struct scsi_disk *sdkp = scsi_disk(rq->q->disk); 1258 1259 /* flush requests don't perform I/O, zero the S/G table */ 1260 memset(&cmd->sdb, 0, sizeof(cmd->sdb)); 1261 1262 if (cmd->device->use_16_for_sync) { 1263 cmd->cmnd[0] = SYNCHRONIZE_CACHE_16; 1264 cmd->cmd_len = 16; 1265 } else { 1266 cmd->cmnd[0] = SYNCHRONIZE_CACHE; 1267 cmd->cmd_len = 10; 1268 } 1269 cmd->transfersize = 0; 1270 cmd->allowed = sdkp->max_retries; 1271 1272 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER; 1273 return BLK_STS_OK; 1274 } 1275 1276 /** 1277 * sd_group_number() - Compute the GROUP NUMBER field 1278 * @cmd: SCSI command for which to compute the value of the six-bit GROUP NUMBER 1279 * field. 1280 * 1281 * From SBC-5 r05 (https://www.t10.org/cgi-bin/ac.pl?t=f&f=sbc5r05.pdf): 1282 * 0: no relative lifetime. 1283 * 1: shortest relative lifetime. 1284 * 2: second shortest relative lifetime. 1285 * 3 - 0x3d: intermediate relative lifetimes. 1286 * 0x3e: second longest relative lifetime. 1287 * 0x3f: longest relative lifetime. 1288 */ 1289 static u8 sd_group_number(struct scsi_cmnd *cmd) 1290 { 1291 const struct request *rq = scsi_cmd_to_rq(cmd); 1292 struct scsi_disk *sdkp = scsi_disk(rq->q->disk); 1293 1294 if (!sdkp->rscs) 1295 return 0; 1296 1297 return min3((u32)rq->bio->bi_write_hint, 1298 (u32)sdkp->permanent_stream_count, 0x3fu); 1299 } 1300 1301 static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write, 1302 sector_t lba, unsigned int nr_blocks, 1303 unsigned char flags, unsigned int dld) 1304 { 1305 cmd->cmd_len = SD_EXT_CDB_SIZE; 1306 cmd->cmnd[0] = VARIABLE_LENGTH_CMD; 1307 cmd->cmnd[6] = sd_group_number(cmd); 1308 cmd->cmnd[7] = 0x18; /* Additional CDB len */ 1309 cmd->cmnd[9] = write ? WRITE_32 : READ_32; 1310 cmd->cmnd[10] = flags; 1311 cmd->cmnd[11] = dld & 0x07; 1312 put_unaligned_be64(lba, &cmd->cmnd[12]); 1313 put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */ 1314 put_unaligned_be32(nr_blocks, &cmd->cmnd[28]); 1315 1316 return BLK_STS_OK; 1317 } 1318 1319 static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write, 1320 sector_t lba, unsigned int nr_blocks, 1321 unsigned char flags, unsigned int dld) 1322 { 1323 cmd->cmd_len = 16; 1324 cmd->cmnd[0] = write ? WRITE_16 : READ_16; 1325 cmd->cmnd[1] = flags | ((dld >> 2) & 0x01); 1326 cmd->cmnd[14] = ((dld & 0x03) << 6) | sd_group_number(cmd); 1327 cmd->cmnd[15] = 0; 1328 put_unaligned_be64(lba, &cmd->cmnd[2]); 1329 put_unaligned_be32(nr_blocks, &cmd->cmnd[10]); 1330 1331 return BLK_STS_OK; 1332 } 1333 1334 static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write, 1335 sector_t lba, unsigned int nr_blocks, 1336 unsigned char flags) 1337 { 1338 cmd->cmd_len = 10; 1339 cmd->cmnd[0] = write ? WRITE_10 : READ_10; 1340 cmd->cmnd[1] = flags; 1341 cmd->cmnd[6] = sd_group_number(cmd); 1342 cmd->cmnd[9] = 0; 1343 put_unaligned_be32(lba, &cmd->cmnd[2]); 1344 put_unaligned_be16(nr_blocks, &cmd->cmnd[7]); 1345 1346 return BLK_STS_OK; 1347 } 1348 1349 static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write, 1350 sector_t lba, unsigned int nr_blocks, 1351 unsigned char flags) 1352 { 1353 /* Avoid that 0 blocks gets translated into 256 blocks. */ 1354 if (WARN_ON_ONCE(nr_blocks == 0)) 1355 return BLK_STS_IOERR; 1356 1357 if (unlikely(flags & 0x8)) { 1358 /* 1359 * This happens only if this drive failed 10byte rw 1360 * command with ILLEGAL_REQUEST during operation and 1361 * thus turned off use_10_for_rw. 1362 */ 1363 scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n"); 1364 return BLK_STS_IOERR; 1365 } 1366 1367 cmd->cmd_len = 6; 1368 cmd->cmnd[0] = write ? WRITE_6 : READ_6; 1369 cmd->cmnd[1] = (lba >> 16) & 0x1f; 1370 cmd->cmnd[2] = (lba >> 8) & 0xff; 1371 cmd->cmnd[3] = lba & 0xff; 1372 cmd->cmnd[4] = nr_blocks; 1373 cmd->cmnd[5] = 0; 1374 1375 return BLK_STS_OK; 1376 } 1377 1378 /* 1379 * Check if a command has a duration limit set. If it does, and the target 1380 * device supports CDL and the feature is enabled, return the limit 1381 * descriptor index to use. Return 0 (no limit) otherwise. 1382 */ 1383 static int sd_cdl_dld(struct scsi_disk *sdkp, struct scsi_cmnd *scmd) 1384 { 1385 struct scsi_device *sdp = sdkp->device; 1386 int hint; 1387 1388 if (!sdp->cdl_supported || !sdp->cdl_enable) 1389 return 0; 1390 1391 /* 1392 * Use "no limit" if the request ioprio does not specify a duration 1393 * limit hint. 1394 */ 1395 hint = IOPRIO_PRIO_HINT(req_get_ioprio(scsi_cmd_to_rq(scmd))); 1396 if (hint < IOPRIO_HINT_DEV_DURATION_LIMIT_1 || 1397 hint > IOPRIO_HINT_DEV_DURATION_LIMIT_7) 1398 return 0; 1399 1400 return (hint - IOPRIO_HINT_DEV_DURATION_LIMIT_1) + 1; 1401 } 1402 1403 static blk_status_t sd_setup_atomic_cmnd(struct scsi_cmnd *cmd, 1404 sector_t lba, unsigned int nr_blocks, 1405 bool boundary, unsigned char flags) 1406 { 1407 cmd->cmd_len = 16; 1408 cmd->cmnd[0] = WRITE_ATOMIC_16; 1409 cmd->cmnd[1] = flags; 1410 put_unaligned_be64(lba, &cmd->cmnd[2]); 1411 put_unaligned_be16(nr_blocks, &cmd->cmnd[12]); 1412 if (boundary) 1413 put_unaligned_be16(nr_blocks, &cmd->cmnd[10]); 1414 else 1415 put_unaligned_be16(0, &cmd->cmnd[10]); 1416 put_unaligned_be16(nr_blocks, &cmd->cmnd[12]); 1417 cmd->cmnd[14] = 0; 1418 cmd->cmnd[15] = 0; 1419 1420 return BLK_STS_OK; 1421 } 1422 1423 static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd) 1424 { 1425 struct request *rq = scsi_cmd_to_rq(cmd); 1426 struct scsi_device *sdp = cmd->device; 1427 struct scsi_disk *sdkp = scsi_disk(rq->q->disk); 1428 sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq)); 1429 sector_t threshold; 1430 unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq)); 1431 unsigned int mask = logical_to_sectors(sdp, 1) - 1; 1432 bool write = rq_data_dir(rq) == WRITE; 1433 unsigned char protect, fua; 1434 unsigned int dld; 1435 blk_status_t ret; 1436 unsigned int dif; 1437 bool dix; 1438 1439 ret = scsi_alloc_sgtables(cmd); 1440 if (ret != BLK_STS_OK) 1441 return ret; 1442 1443 ret = BLK_STS_IOERR; 1444 if (!scsi_device_online(sdp) || sdp->changed) { 1445 scmd_printk(KERN_ERR, cmd, "device offline or changed\n"); 1446 goto fail; 1447 } 1448 1449 if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->q->disk)) { 1450 scmd_printk(KERN_ERR, cmd, "access beyond end of device\n"); 1451 goto fail; 1452 } 1453 1454 if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) { 1455 scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n"); 1456 goto fail; 1457 } 1458 1459 /* 1460 * Some SD card readers can't handle accesses which touch the 1461 * last one or two logical blocks. Split accesses as needed. 1462 */ 1463 threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS; 1464 1465 if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) { 1466 if (lba < threshold) { 1467 /* Access up to the threshold but not beyond */ 1468 nr_blocks = threshold - lba; 1469 } else { 1470 /* Access only a single logical block */ 1471 nr_blocks = 1; 1472 } 1473 } 1474 1475 fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0; 1476 dix = scsi_prot_sg_count(cmd); 1477 dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type); 1478 dld = sd_cdl_dld(sdkp, cmd); 1479 1480 if (dif || dix) 1481 protect = sd_setup_protect_cmnd(cmd, dix, dif); 1482 else 1483 protect = 0; 1484 1485 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) { 1486 ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks, 1487 protect | fua, dld); 1488 } else if (rq->cmd_flags & REQ_ATOMIC) { 1489 ret = sd_setup_atomic_cmnd(cmd, lba, nr_blocks, 1490 sdkp->use_atomic_write_boundary, 1491 protect | fua); 1492 } else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) { 1493 ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks, 1494 protect | fua, dld); 1495 } else if ((nr_blocks > 0xff) || (lba > 0x1fffff) || 1496 sdp->use_10_for_rw || protect || rq->bio->bi_write_hint) { 1497 ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks, 1498 protect | fua); 1499 } else { 1500 ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks, 1501 protect | fua); 1502 } 1503 1504 if (unlikely(ret != BLK_STS_OK)) 1505 goto fail; 1506 1507 /* 1508 * We shouldn't disconnect in the middle of a sector, so with a dumb 1509 * host adapter, it's safe to assume that we can at least transfer 1510 * this many bytes between each connect / disconnect. 1511 */ 1512 cmd->transfersize = sdp->sector_size; 1513 cmd->underflow = nr_blocks << 9; 1514 cmd->allowed = sdkp->max_retries; 1515 cmd->sdb.length = nr_blocks * sdp->sector_size; 1516 1517 SCSI_LOG_HLQUEUE(1, 1518 scmd_printk(KERN_INFO, cmd, 1519 "%s: block=%llu, count=%d\n", __func__, 1520 (unsigned long long)blk_rq_pos(rq), 1521 blk_rq_sectors(rq))); 1522 SCSI_LOG_HLQUEUE(2, 1523 scmd_printk(KERN_INFO, cmd, 1524 "%s %d/%u 512 byte blocks.\n", 1525 write ? "writing" : "reading", nr_blocks, 1526 blk_rq_sectors(rq))); 1527 1528 /* 1529 * This indicates that the command is ready from our end to be queued. 1530 */ 1531 return BLK_STS_OK; 1532 fail: 1533 scsi_free_sgtables(cmd); 1534 return ret; 1535 } 1536 1537 static blk_status_t sd_init_command(struct scsi_cmnd *cmd) 1538 { 1539 struct request *rq = scsi_cmd_to_rq(cmd); 1540 1541 switch (req_op(rq)) { 1542 case REQ_OP_DISCARD: 1543 switch (scsi_disk(rq->q->disk)->provisioning_mode) { 1544 case SD_LBP_UNMAP: 1545 return sd_setup_unmap_cmnd(cmd); 1546 case SD_LBP_WS16: 1547 return sd_setup_write_same16_cmnd(cmd, true); 1548 case SD_LBP_WS10: 1549 return sd_setup_write_same10_cmnd(cmd, true); 1550 case SD_LBP_ZERO: 1551 return sd_setup_write_same10_cmnd(cmd, false); 1552 default: 1553 return BLK_STS_TARGET; 1554 } 1555 case REQ_OP_WRITE_ZEROES: 1556 return sd_setup_write_zeroes_cmnd(cmd); 1557 case REQ_OP_FLUSH: 1558 return sd_setup_flush_cmnd(cmd); 1559 case REQ_OP_READ: 1560 case REQ_OP_WRITE: 1561 return sd_setup_read_write_cmnd(cmd); 1562 case REQ_OP_ZONE_RESET: 1563 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER, 1564 false); 1565 case REQ_OP_ZONE_RESET_ALL: 1566 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER, 1567 true); 1568 case REQ_OP_ZONE_OPEN: 1569 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false); 1570 case REQ_OP_ZONE_CLOSE: 1571 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false); 1572 case REQ_OP_ZONE_FINISH: 1573 return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false); 1574 default: 1575 WARN_ON_ONCE(1); 1576 return BLK_STS_NOTSUPP; 1577 } 1578 } 1579 1580 static bool sd_need_revalidate(struct gendisk *disk, struct scsi_disk *sdkp) 1581 { 1582 if (sdkp->device->removable || sdkp->write_prot) { 1583 if (disk_check_media_change(disk)) 1584 return true; 1585 } 1586 1587 /* 1588 * Force a full rescan after ioctl(BLKRRPART). While the disk state has 1589 * nothing to do with partitions, BLKRRPART is used to force a full 1590 * revalidate after things like a format for historical reasons. 1591 */ 1592 return test_bit(GD_NEED_PART_SCAN, &disk->state); 1593 } 1594 1595 /** 1596 * sd_open - open a scsi disk device 1597 * @disk: disk to open 1598 * @mode: open mode 1599 * 1600 * Returns 0 if successful. Returns a negated errno value in case 1601 * of error. 1602 * 1603 * Note: This can be called from a user context (e.g. fsck(1) ) 1604 * or from within the kernel (e.g. as a result of a mount(1) ). 1605 * In the latter case @inode and @filp carry an abridged amount 1606 * of information as noted above. 1607 * 1608 * Locking: called with disk->open_mutex held. 1609 **/ 1610 static int sd_open(struct gendisk *disk, blk_mode_t mode) 1611 { 1612 struct scsi_disk *sdkp = scsi_disk(disk); 1613 struct scsi_device *sdev = sdkp->device; 1614 int retval; 1615 1616 if (scsi_device_get(sdev)) 1617 return -ENXIO; 1618 1619 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 1620 1621 /* 1622 * If the device is in error recovery, wait until it is done. 1623 * If the device is offline, then disallow any access to it. 1624 */ 1625 retval = -ENXIO; 1626 if (!scsi_block_when_processing_errors(sdev)) 1627 goto error_out; 1628 1629 if (sd_need_revalidate(disk, sdkp)) 1630 sd_revalidate_disk(disk); 1631 1632 /* 1633 * If the drive is empty, just let the open fail. 1634 */ 1635 retval = -ENOMEDIUM; 1636 if (sdev->removable && !sdkp->media_present && 1637 !(mode & BLK_OPEN_NDELAY)) 1638 goto error_out; 1639 1640 /* 1641 * If the device has the write protect tab set, have the open fail 1642 * if the user expects to be able to write to the thing. 1643 */ 1644 retval = -EROFS; 1645 if (sdkp->write_prot && (mode & BLK_OPEN_WRITE)) 1646 goto error_out; 1647 1648 /* 1649 * It is possible that the disk changing stuff resulted in 1650 * the device being taken offline. If this is the case, 1651 * report this to the user, and don't pretend that the 1652 * open actually succeeded. 1653 */ 1654 retval = -ENXIO; 1655 if (!scsi_device_online(sdev)) 1656 goto error_out; 1657 1658 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 1659 if (scsi_block_when_processing_errors(sdev)) 1660 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 1661 } 1662 1663 return 0; 1664 1665 error_out: 1666 scsi_device_put(sdev); 1667 return retval; 1668 } 1669 1670 /** 1671 * sd_release - invoked when the (last) close(2) is called on this 1672 * scsi disk. 1673 * @disk: disk to release 1674 * 1675 * Returns 0. 1676 * 1677 * Note: may block (uninterruptible) if error recovery is underway 1678 * on this disk. 1679 * 1680 * Locking: called with disk->open_mutex held. 1681 **/ 1682 static void sd_release(struct gendisk *disk) 1683 { 1684 struct scsi_disk *sdkp = scsi_disk(disk); 1685 struct scsi_device *sdev = sdkp->device; 1686 1687 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 1688 1689 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 1690 if (scsi_block_when_processing_errors(sdev)) 1691 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 1692 } 1693 1694 scsi_device_put(sdev); 1695 } 1696 1697 static int sd_getgeo(struct gendisk *disk, struct hd_geometry *geo) 1698 { 1699 struct scsi_disk *sdkp = scsi_disk(disk); 1700 struct scsi_device *sdp = sdkp->device; 1701 struct Scsi_Host *host = sdp->host; 1702 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity); 1703 int diskinfo[4]; 1704 1705 /* default to most commonly used values */ 1706 diskinfo[0] = 0x40; /* 1 << 6 */ 1707 diskinfo[1] = 0x20; /* 1 << 5 */ 1708 diskinfo[2] = capacity >> 11; 1709 1710 /* override with calculated, extended default, or driver values */ 1711 if (host->hostt->bios_param) 1712 host->hostt->bios_param(sdp, disk, capacity, diskinfo); 1713 else 1714 scsicam_bios_param(disk, capacity, diskinfo); 1715 1716 geo->heads = diskinfo[0]; 1717 geo->sectors = diskinfo[1]; 1718 geo->cylinders = diskinfo[2]; 1719 return 0; 1720 } 1721 1722 /** 1723 * sd_ioctl - process an ioctl 1724 * @bdev: target block device 1725 * @mode: open mode 1726 * @cmd: ioctl command number 1727 * @arg: this is third argument given to ioctl(2) system call. 1728 * Often contains a pointer. 1729 * 1730 * Returns 0 if successful (some ioctls return positive numbers on 1731 * success as well). Returns a negated errno value in case of error. 1732 * 1733 * Note: most ioctls are forward onto the block subsystem or further 1734 * down in the scsi subsystem. 1735 **/ 1736 static int sd_ioctl(struct block_device *bdev, blk_mode_t mode, 1737 unsigned int cmd, unsigned long arg) 1738 { 1739 struct gendisk *disk = bdev->bd_disk; 1740 struct scsi_disk *sdkp = scsi_disk(disk); 1741 struct scsi_device *sdp = sdkp->device; 1742 void __user *p = (void __user *)arg; 1743 int error; 1744 1745 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, 1746 "sd_ioctl: disk=%s, cmd=0x%x\n", 1747 disk->disk_name, cmd)); 1748 1749 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO)) 1750 return -ENOIOCTLCMD; 1751 1752 /* 1753 * If we are in the middle of error recovery, don't let anyone 1754 * else try and use this device. Also, if error recovery fails, it 1755 * may try and take the device offline, in which case all further 1756 * access to the device is prohibited. 1757 */ 1758 error = scsi_ioctl_block_when_processing_errors(sdp, cmd, 1759 (mode & BLK_OPEN_NDELAY)); 1760 if (error) 1761 return error; 1762 1763 if (is_sed_ioctl(cmd)) 1764 return sed_ioctl(sdkp->opal_dev, cmd, p); 1765 return scsi_ioctl(sdp, mode & BLK_OPEN_WRITE, cmd, p); 1766 } 1767 1768 static void set_media_not_present(struct scsi_disk *sdkp) 1769 { 1770 if (sdkp->media_present) 1771 sdkp->device->changed = 1; 1772 1773 if (sdkp->device->removable) { 1774 sdkp->media_present = 0; 1775 sdkp->capacity = 0; 1776 } 1777 } 1778 1779 static int media_not_present(struct scsi_disk *sdkp, 1780 struct scsi_sense_hdr *sshdr) 1781 { 1782 if (!scsi_sense_valid(sshdr)) 1783 return 0; 1784 1785 /* not invoked for commands that could return deferred errors */ 1786 switch (sshdr->sense_key) { 1787 case UNIT_ATTENTION: 1788 case NOT_READY: 1789 /* medium not present */ 1790 if (sshdr->asc == 0x3A) { 1791 set_media_not_present(sdkp); 1792 return 1; 1793 } 1794 } 1795 return 0; 1796 } 1797 1798 /** 1799 * sd_check_events - check media events 1800 * @disk: kernel device descriptor 1801 * @clearing: disk events currently being cleared 1802 * 1803 * Returns mask of DISK_EVENT_*. 1804 * 1805 * Note: this function is invoked from the block subsystem. 1806 **/ 1807 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) 1808 { 1809 struct scsi_disk *sdkp = disk->private_data; 1810 struct scsi_device *sdp; 1811 int retval; 1812 bool disk_changed; 1813 1814 if (!sdkp) 1815 return 0; 1816 1817 sdp = sdkp->device; 1818 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); 1819 1820 /* 1821 * If the device is offline, don't send any commands - just pretend as 1822 * if the command failed. If the device ever comes back online, we 1823 * can deal with it then. It is only because of unrecoverable errors 1824 * that we would ever take a device offline in the first place. 1825 */ 1826 if (!scsi_device_online(sdp)) { 1827 set_media_not_present(sdkp); 1828 goto out; 1829 } 1830 1831 /* 1832 * Using TEST_UNIT_READY enables differentiation between drive with 1833 * no cartridge loaded - NOT READY, drive with changed cartridge - 1834 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1835 * 1836 * Drives that auto spin down. eg iomega jaz 1G, will be started 1837 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1838 * sd_revalidate() is called. 1839 */ 1840 if (scsi_block_when_processing_errors(sdp)) { 1841 struct scsi_sense_hdr sshdr = { 0, }; 1842 1843 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, sdkp->max_retries, 1844 &sshdr); 1845 1846 /* failed to execute TUR, assume media not present */ 1847 if (retval < 0 || host_byte(retval)) { 1848 set_media_not_present(sdkp); 1849 goto out; 1850 } 1851 1852 if (media_not_present(sdkp, &sshdr)) 1853 goto out; 1854 } 1855 1856 /* 1857 * For removable scsi disk we have to recognise the presence 1858 * of a disk in the drive. 1859 */ 1860 if (!sdkp->media_present) 1861 sdp->changed = 1; 1862 sdkp->media_present = 1; 1863 out: 1864 /* 1865 * sdp->changed is set under the following conditions: 1866 * 1867 * Medium present state has changed in either direction. 1868 * Device has indicated UNIT_ATTENTION. 1869 */ 1870 disk_changed = sdp->changed; 1871 sdp->changed = 0; 1872 return disk_changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1873 } 1874 1875 static int sd_sync_cache(struct scsi_disk *sdkp) 1876 { 1877 int res; 1878 struct scsi_device *sdp = sdkp->device; 1879 const int timeout = sdp->request_queue->rq_timeout 1880 * SD_FLUSH_TIMEOUT_MULTIPLIER; 1881 /* Leave the rest of the command zero to indicate flush everything. */ 1882 const unsigned char cmd[16] = { sdp->use_16_for_sync ? 1883 SYNCHRONIZE_CACHE_16 : SYNCHRONIZE_CACHE }; 1884 struct scsi_sense_hdr sshdr; 1885 struct scsi_failure failure_defs[] = { 1886 { 1887 .allowed = 3, 1888 .result = SCMD_FAILURE_RESULT_ANY, 1889 }, 1890 {} 1891 }; 1892 struct scsi_failures failures = { 1893 .failure_definitions = failure_defs, 1894 }; 1895 const struct scsi_exec_args exec_args = { 1896 .req_flags = BLK_MQ_REQ_PM, 1897 .sshdr = &sshdr, 1898 .failures = &failures, 1899 }; 1900 1901 if (!scsi_device_online(sdp)) 1902 return -ENODEV; 1903 1904 res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, timeout, 1905 sdkp->max_retries, &exec_args); 1906 if (res) { 1907 sd_print_result(sdkp, "Synchronize Cache(10) failed", res); 1908 1909 if (res < 0) 1910 return res; 1911 1912 if (scsi_status_is_check_condition(res) && 1913 scsi_sense_valid(&sshdr)) { 1914 sd_print_sense_hdr(sdkp, &sshdr); 1915 1916 /* we need to evaluate the error return */ 1917 if (sshdr.asc == 0x3a || /* medium not present */ 1918 sshdr.asc == 0x20 || /* invalid command */ 1919 (sshdr.asc == 0x74 && sshdr.ascq == 0x71)) /* drive is password locked */ 1920 /* this is no error here */ 1921 return 0; 1922 1923 /* 1924 * If a format is in progress or if the drive does not 1925 * support sync, there is not much we can do because 1926 * this is called during shutdown or suspend so just 1927 * return success so those operations can proceed. 1928 */ 1929 if ((sshdr.asc == 0x04 && sshdr.ascq == 0x04) || 1930 sshdr.sense_key == ILLEGAL_REQUEST) 1931 return 0; 1932 } 1933 1934 switch (host_byte(res)) { 1935 /* ignore errors due to racing a disconnection */ 1936 case DID_BAD_TARGET: 1937 case DID_NO_CONNECT: 1938 return 0; 1939 /* signal the upper layer it might try again */ 1940 case DID_BUS_BUSY: 1941 case DID_IMM_RETRY: 1942 case DID_REQUEUE: 1943 case DID_SOFT_ERROR: 1944 return -EBUSY; 1945 default: 1946 return -EIO; 1947 } 1948 } 1949 return 0; 1950 } 1951 1952 static void sd_rescan(struct device *dev) 1953 { 1954 struct scsi_disk *sdkp = dev_get_drvdata(dev); 1955 1956 sd_revalidate_disk(sdkp->disk); 1957 } 1958 1959 static int sd_get_unique_id(struct gendisk *disk, u8 id[16], 1960 enum blk_unique_id type) 1961 { 1962 struct scsi_device *sdev = scsi_disk(disk)->device; 1963 const struct scsi_vpd *vpd; 1964 const unsigned char *d; 1965 int ret = -ENXIO, len; 1966 1967 rcu_read_lock(); 1968 vpd = rcu_dereference(sdev->vpd_pg83); 1969 if (!vpd) 1970 goto out_unlock; 1971 1972 ret = -EINVAL; 1973 for (d = vpd->data + 4; d < vpd->data + vpd->len; d += d[3] + 4) { 1974 /* we only care about designators with LU association */ 1975 if (((d[1] >> 4) & 0x3) != 0x00) 1976 continue; 1977 if ((d[1] & 0xf) != type) 1978 continue; 1979 1980 /* 1981 * Only exit early if a 16-byte descriptor was found. Otherwise 1982 * keep looking as one with more entropy might still show up. 1983 */ 1984 len = d[3]; 1985 if (len != 8 && len != 12 && len != 16) 1986 continue; 1987 ret = len; 1988 memcpy(id, d + 4, len); 1989 if (len == 16) 1990 break; 1991 } 1992 out_unlock: 1993 rcu_read_unlock(); 1994 return ret; 1995 } 1996 1997 static int sd_scsi_to_pr_err(struct scsi_sense_hdr *sshdr, int result) 1998 { 1999 switch (host_byte(result)) { 2000 case DID_TRANSPORT_MARGINAL: 2001 case DID_TRANSPORT_DISRUPTED: 2002 case DID_BUS_BUSY: 2003 return PR_STS_RETRY_PATH_FAILURE; 2004 case DID_NO_CONNECT: 2005 return PR_STS_PATH_FAILED; 2006 case DID_TRANSPORT_FAILFAST: 2007 return PR_STS_PATH_FAST_FAILED; 2008 } 2009 2010 switch (status_byte(result)) { 2011 case SAM_STAT_RESERVATION_CONFLICT: 2012 return PR_STS_RESERVATION_CONFLICT; 2013 case SAM_STAT_CHECK_CONDITION: 2014 if (!scsi_sense_valid(sshdr)) 2015 return PR_STS_IOERR; 2016 2017 if (sshdr->sense_key == ILLEGAL_REQUEST && 2018 (sshdr->asc == 0x26 || sshdr->asc == 0x24)) 2019 return -EINVAL; 2020 2021 fallthrough; 2022 default: 2023 return PR_STS_IOERR; 2024 } 2025 } 2026 2027 static int sd_pr_in_command(struct block_device *bdev, u8 sa, 2028 unsigned char *data, int data_len) 2029 { 2030 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 2031 struct scsi_device *sdev = sdkp->device; 2032 struct scsi_sense_hdr sshdr; 2033 u8 cmd[10] = { PERSISTENT_RESERVE_IN, sa }; 2034 struct scsi_failure failure_defs[] = { 2035 { 2036 .sense = UNIT_ATTENTION, 2037 .asc = SCMD_FAILURE_ASC_ANY, 2038 .ascq = SCMD_FAILURE_ASCQ_ANY, 2039 .allowed = 5, 2040 .result = SAM_STAT_CHECK_CONDITION, 2041 }, 2042 {} 2043 }; 2044 struct scsi_failures failures = { 2045 .failure_definitions = failure_defs, 2046 }; 2047 const struct scsi_exec_args exec_args = { 2048 .sshdr = &sshdr, 2049 .failures = &failures, 2050 }; 2051 int result; 2052 2053 put_unaligned_be16(data_len, &cmd[7]); 2054 2055 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, data, data_len, 2056 SD_TIMEOUT, sdkp->max_retries, &exec_args); 2057 if (scsi_status_is_check_condition(result) && 2058 scsi_sense_valid(&sshdr)) { 2059 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result); 2060 scsi_print_sense_hdr(sdev, NULL, &sshdr); 2061 } 2062 2063 if (result <= 0) 2064 return result; 2065 2066 return sd_scsi_to_pr_err(&sshdr, result); 2067 } 2068 2069 static int sd_pr_read_keys(struct block_device *bdev, struct pr_keys *keys_info) 2070 { 2071 int result, i, data_offset, num_copy_keys; 2072 u32 num_keys = keys_info->num_keys; 2073 int data_len; 2074 u8 *data; 2075 2076 /* 2077 * Each reservation key takes 8 bytes and there is an 8-byte header 2078 * before the reservation key list. The total size must fit into the 2079 * 16-bit ALLOCATION LENGTH field. 2080 */ 2081 if (check_mul_overflow(num_keys, 8, &data_len) || 2082 check_add_overflow(data_len, 8, &data_len) || 2083 data_len > USHRT_MAX) 2084 return -EINVAL; 2085 2086 data = kzalloc(data_len, GFP_KERNEL); 2087 if (!data) 2088 return -ENOMEM; 2089 2090 result = sd_pr_in_command(bdev, READ_KEYS, data, data_len); 2091 if (result) 2092 goto free_data; 2093 2094 keys_info->generation = get_unaligned_be32(&data[0]); 2095 keys_info->num_keys = get_unaligned_be32(&data[4]) / 8; 2096 2097 data_offset = 8; 2098 num_copy_keys = min(num_keys, keys_info->num_keys); 2099 2100 for (i = 0; i < num_copy_keys; i++) { 2101 keys_info->keys[i] = get_unaligned_be64(&data[data_offset]); 2102 data_offset += 8; 2103 } 2104 2105 free_data: 2106 kfree(data); 2107 return result; 2108 } 2109 2110 static int sd_pr_read_reservation(struct block_device *bdev, 2111 struct pr_held_reservation *rsv) 2112 { 2113 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 2114 struct scsi_device *sdev = sdkp->device; 2115 u8 data[24] = { }; 2116 int result, len; 2117 2118 result = sd_pr_in_command(bdev, READ_RESERVATION, data, sizeof(data)); 2119 if (result) 2120 return result; 2121 2122 len = get_unaligned_be32(&data[4]); 2123 if (!len) 2124 return 0; 2125 2126 /* Make sure we have at least the key and type */ 2127 if (len < 14) { 2128 sdev_printk(KERN_INFO, sdev, 2129 "READ RESERVATION failed due to short return buffer of %d bytes\n", 2130 len); 2131 return -EINVAL; 2132 } 2133 2134 rsv->generation = get_unaligned_be32(&data[0]); 2135 rsv->key = get_unaligned_be64(&data[8]); 2136 rsv->type = scsi_pr_type_to_block(data[21] & 0x0f); 2137 return 0; 2138 } 2139 2140 static int sd_pr_out_command(struct block_device *bdev, u8 sa, u64 key, 2141 u64 sa_key, enum scsi_pr_type type, u8 flags) 2142 { 2143 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 2144 struct scsi_device *sdev = sdkp->device; 2145 struct scsi_sense_hdr sshdr; 2146 struct scsi_failure failure_defs[] = { 2147 { 2148 .sense = UNIT_ATTENTION, 2149 .asc = SCMD_FAILURE_ASC_ANY, 2150 .ascq = SCMD_FAILURE_ASCQ_ANY, 2151 .allowed = 5, 2152 .result = SAM_STAT_CHECK_CONDITION, 2153 }, 2154 {} 2155 }; 2156 struct scsi_failures failures = { 2157 .failure_definitions = failure_defs, 2158 }; 2159 const struct scsi_exec_args exec_args = { 2160 .sshdr = &sshdr, 2161 .failures = &failures, 2162 }; 2163 int result; 2164 u8 cmd[16] = { 0, }; 2165 u8 data[24] = { 0, }; 2166 2167 cmd[0] = PERSISTENT_RESERVE_OUT; 2168 cmd[1] = sa; 2169 cmd[2] = type; 2170 put_unaligned_be32(sizeof(data), &cmd[5]); 2171 2172 put_unaligned_be64(key, &data[0]); 2173 put_unaligned_be64(sa_key, &data[8]); 2174 data[20] = flags; 2175 2176 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_OUT, &data, 2177 sizeof(data), SD_TIMEOUT, sdkp->max_retries, 2178 &exec_args); 2179 2180 if (scsi_status_is_check_condition(result) && 2181 scsi_sense_valid(&sshdr)) { 2182 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result); 2183 scsi_print_sense_hdr(sdev, NULL, &sshdr); 2184 } 2185 2186 if (result <= 0) 2187 return result; 2188 2189 return sd_scsi_to_pr_err(&sshdr, result); 2190 } 2191 2192 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, 2193 u32 flags) 2194 { 2195 if (flags & ~PR_FL_IGNORE_KEY) 2196 return -EOPNOTSUPP; 2197 return sd_pr_out_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00, 2198 old_key, new_key, 0, 2199 (1 << 0) /* APTPL */); 2200 } 2201 2202 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, 2203 u32 flags) 2204 { 2205 if (flags) 2206 return -EOPNOTSUPP; 2207 return sd_pr_out_command(bdev, 0x01, key, 0, 2208 block_pr_type_to_scsi(type), 0); 2209 } 2210 2211 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type) 2212 { 2213 return sd_pr_out_command(bdev, 0x02, key, 0, 2214 block_pr_type_to_scsi(type), 0); 2215 } 2216 2217 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, 2218 enum pr_type type, bool abort) 2219 { 2220 return sd_pr_out_command(bdev, abort ? 0x05 : 0x04, old_key, new_key, 2221 block_pr_type_to_scsi(type), 0); 2222 } 2223 2224 static int sd_pr_clear(struct block_device *bdev, u64 key) 2225 { 2226 return sd_pr_out_command(bdev, 0x03, key, 0, 0, 0); 2227 } 2228 2229 static const struct pr_ops sd_pr_ops = { 2230 .pr_register = sd_pr_register, 2231 .pr_reserve = sd_pr_reserve, 2232 .pr_release = sd_pr_release, 2233 .pr_preempt = sd_pr_preempt, 2234 .pr_clear = sd_pr_clear, 2235 .pr_read_keys = sd_pr_read_keys, 2236 .pr_read_reservation = sd_pr_read_reservation, 2237 }; 2238 2239 static void scsi_disk_free_disk(struct gendisk *disk) 2240 { 2241 struct scsi_disk *sdkp = scsi_disk(disk); 2242 2243 put_device(&sdkp->disk_dev); 2244 } 2245 2246 /** 2247 * sd_eh_reset - reset error handling callback 2248 * @scmd: sd-issued command that has failed 2249 * 2250 * This function is called by the SCSI midlayer before starting 2251 * SCSI EH. When counting medium access failures we have to be 2252 * careful to register it only only once per device and SCSI EH run; 2253 * there might be several timed out commands which will cause the 2254 * 'max_medium_access_timeouts' counter to trigger after the first 2255 * SCSI EH run already and set the device to offline. 2256 * So this function resets the internal counter before starting SCSI EH. 2257 **/ 2258 static void sd_eh_reset(struct scsi_cmnd *scmd) 2259 { 2260 struct scsi_disk *sdkp = scsi_disk(scsi_cmd_to_rq(scmd)->q->disk); 2261 2262 /* New SCSI EH run, reset gate variable */ 2263 sdkp->ignore_medium_access_errors = false; 2264 } 2265 2266 /** 2267 * sd_eh_action - error handling callback 2268 * @scmd: sd-issued command that has failed 2269 * @eh_disp: The recovery disposition suggested by the midlayer 2270 * 2271 * This function is called by the SCSI midlayer upon completion of an 2272 * error test command (currently TEST UNIT READY). The result of sending 2273 * the eh command is passed in eh_disp. We're looking for devices that 2274 * fail medium access commands but are OK with non access commands like 2275 * test unit ready (so wrongly see the device as having a successful 2276 * recovery) 2277 **/ 2278 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp) 2279 { 2280 struct scsi_disk *sdkp = scsi_disk(scsi_cmd_to_rq(scmd)->q->disk); 2281 struct scsi_device *sdev = scmd->device; 2282 2283 if (!scsi_device_online(sdev) || 2284 !scsi_medium_access_command(scmd) || 2285 host_byte(scmd->result) != DID_TIME_OUT || 2286 eh_disp != SUCCESS) 2287 return eh_disp; 2288 2289 /* 2290 * The device has timed out executing a medium access command. 2291 * However, the TEST UNIT READY command sent during error 2292 * handling completed successfully. Either the device is in the 2293 * process of recovering or has it suffered an internal failure 2294 * that prevents access to the storage medium. 2295 */ 2296 if (!sdkp->ignore_medium_access_errors) { 2297 sdkp->medium_access_timed_out++; 2298 sdkp->ignore_medium_access_errors = true; 2299 } 2300 2301 /* 2302 * If the device keeps failing read/write commands but TEST UNIT 2303 * READY always completes successfully we assume that medium 2304 * access is no longer possible and take the device offline. 2305 */ 2306 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { 2307 scmd_printk(KERN_ERR, scmd, 2308 "Medium access timeout failure. Offlining disk!\n"); 2309 mutex_lock(&sdev->state_mutex); 2310 scsi_device_set_state(sdev, SDEV_OFFLINE); 2311 mutex_unlock(&sdev->state_mutex); 2312 2313 return SUCCESS; 2314 } 2315 2316 return eh_disp; 2317 } 2318 2319 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 2320 { 2321 struct request *req = scsi_cmd_to_rq(scmd); 2322 struct scsi_device *sdev = scmd->device; 2323 unsigned int transferred, good_bytes; 2324 u64 start_lba, end_lba, bad_lba; 2325 2326 /* 2327 * Some commands have a payload smaller than the device logical 2328 * block size (e.g. INQUIRY on a 4K disk). 2329 */ 2330 if (scsi_bufflen(scmd) <= sdev->sector_size) 2331 return 0; 2332 2333 /* Check if we have a 'bad_lba' information */ 2334 if (!scsi_get_sense_info_fld(scmd->sense_buffer, 2335 SCSI_SENSE_BUFFERSIZE, 2336 &bad_lba)) 2337 return 0; 2338 2339 /* 2340 * If the bad lba was reported incorrectly, we have no idea where 2341 * the error is. 2342 */ 2343 start_lba = sectors_to_logical(sdev, blk_rq_pos(req)); 2344 end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd)); 2345 if (bad_lba < start_lba || bad_lba >= end_lba) 2346 return 0; 2347 2348 /* 2349 * resid is optional but mostly filled in. When it's unused, 2350 * its value is zero, so we assume the whole buffer transferred 2351 */ 2352 transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 2353 2354 /* This computation should always be done in terms of the 2355 * resolution of the device's medium. 2356 */ 2357 good_bytes = logical_to_bytes(sdev, bad_lba - start_lba); 2358 2359 return min(good_bytes, transferred); 2360 } 2361 2362 /** 2363 * sd_done - bottom half handler: called when the lower level 2364 * driver has completed (successfully or otherwise) a scsi command. 2365 * @SCpnt: mid-level's per command structure. 2366 * 2367 * Note: potentially run from within an ISR. Must not block. 2368 **/ 2369 static int sd_done(struct scsi_cmnd *SCpnt) 2370 { 2371 int result = SCpnt->result; 2372 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 2373 unsigned int sector_size = SCpnt->device->sector_size; 2374 unsigned int resid; 2375 struct scsi_sense_hdr sshdr; 2376 struct request *req = scsi_cmd_to_rq(SCpnt); 2377 struct scsi_disk *sdkp = scsi_disk(req->q->disk); 2378 int sense_valid = 0; 2379 int sense_deferred = 0; 2380 2381 switch (req_op(req)) { 2382 case REQ_OP_DISCARD: 2383 case REQ_OP_WRITE_ZEROES: 2384 case REQ_OP_ZONE_RESET: 2385 case REQ_OP_ZONE_RESET_ALL: 2386 case REQ_OP_ZONE_OPEN: 2387 case REQ_OP_ZONE_CLOSE: 2388 case REQ_OP_ZONE_FINISH: 2389 if (!result) { 2390 good_bytes = blk_rq_bytes(req); 2391 scsi_set_resid(SCpnt, 0); 2392 } else { 2393 good_bytes = 0; 2394 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 2395 } 2396 break; 2397 default: 2398 /* 2399 * In case of bogus fw or device, we could end up having 2400 * an unaligned partial completion. Check this here and force 2401 * alignment. 2402 */ 2403 resid = scsi_get_resid(SCpnt); 2404 if (resid & (sector_size - 1)) { 2405 sd_printk(KERN_INFO, sdkp, 2406 "Unaligned partial completion (resid=%u, sector_sz=%u)\n", 2407 resid, sector_size); 2408 scsi_print_command(SCpnt); 2409 resid = min(scsi_bufflen(SCpnt), 2410 round_up(resid, sector_size)); 2411 scsi_set_resid(SCpnt, resid); 2412 } 2413 } 2414 2415 if (result) { 2416 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 2417 if (sense_valid) 2418 sense_deferred = scsi_sense_is_deferred(&sshdr); 2419 } 2420 sdkp->medium_access_timed_out = 0; 2421 2422 if (!scsi_status_is_check_condition(result) || 2423 !sense_valid || sense_deferred) 2424 goto out; 2425 2426 switch (sshdr.sense_key) { 2427 case HARDWARE_ERROR: 2428 case MEDIUM_ERROR: 2429 good_bytes = sd_completed_bytes(SCpnt); 2430 break; 2431 case RECOVERED_ERROR: 2432 good_bytes = scsi_bufflen(SCpnt); 2433 break; 2434 case NO_SENSE: 2435 /* This indicates a false check condition, so ignore it. An 2436 * unknown amount of data was transferred so treat it as an 2437 * error. 2438 */ 2439 SCpnt->result = 0; 2440 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2441 break; 2442 case ABORTED_COMMAND: 2443 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 2444 good_bytes = sd_completed_bytes(SCpnt); 2445 break; 2446 case ILLEGAL_REQUEST: 2447 switch (sshdr.asc) { 2448 case 0x10: /* DIX: Host detected corruption */ 2449 good_bytes = sd_completed_bytes(SCpnt); 2450 break; 2451 case 0x20: /* INVALID COMMAND OPCODE */ 2452 case 0x24: /* INVALID FIELD IN CDB */ 2453 switch (SCpnt->cmnd[0]) { 2454 case UNMAP: 2455 sd_disable_discard(sdkp); 2456 break; 2457 case WRITE_SAME_16: 2458 case WRITE_SAME: 2459 if (SCpnt->cmnd[1] & 8) { /* UNMAP */ 2460 sd_disable_discard(sdkp); 2461 } else { 2462 sd_disable_write_same(sdkp); 2463 req->rq_flags |= RQF_QUIET; 2464 } 2465 break; 2466 } 2467 } 2468 break; 2469 default: 2470 break; 2471 } 2472 2473 out: 2474 if (sdkp->device->type == TYPE_ZBC) 2475 good_bytes = sd_zbc_complete(SCpnt, good_bytes, &sshdr); 2476 2477 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 2478 "sd_done: completed %d of %d bytes\n", 2479 good_bytes, scsi_bufflen(SCpnt))); 2480 2481 return good_bytes; 2482 } 2483 2484 /* 2485 * spinup disk - called only in sd_revalidate_disk() 2486 */ 2487 static void 2488 sd_spinup_disk(struct scsi_disk *sdkp) 2489 { 2490 static const u8 cmd[10] = { TEST_UNIT_READY }; 2491 unsigned long spintime_expire = 0; 2492 int the_result, spintime, sense_valid = 0; 2493 struct scsi_sense_hdr sshdr; 2494 struct scsi_failure failure_defs[] = { 2495 /* Do not retry Medium Not Present */ 2496 { 2497 .sense = UNIT_ATTENTION, 2498 .asc = 0x3A, 2499 .ascq = SCMD_FAILURE_ASCQ_ANY, 2500 .result = SAM_STAT_CHECK_CONDITION, 2501 }, 2502 { 2503 .sense = NOT_READY, 2504 .asc = 0x3A, 2505 .ascq = SCMD_FAILURE_ASCQ_ANY, 2506 .result = SAM_STAT_CHECK_CONDITION, 2507 }, 2508 /* Retry when scsi_status_is_good would return false 3 times */ 2509 { 2510 .result = SCMD_FAILURE_STAT_ANY, 2511 .allowed = 3, 2512 }, 2513 {} 2514 }; 2515 struct scsi_failures failures = { 2516 .failure_definitions = failure_defs, 2517 }; 2518 const struct scsi_exec_args exec_args = { 2519 .sshdr = &sshdr, 2520 .failures = &failures, 2521 }; 2522 2523 spintime = 0; 2524 2525 /* Spin up drives, as required. Only do this at boot time */ 2526 /* Spinup needs to be done for module loads too. */ 2527 do { 2528 bool media_was_present = sdkp->media_present; 2529 2530 scsi_failures_reset_retries(&failures); 2531 2532 the_result = scsi_execute_cmd(sdkp->device, cmd, REQ_OP_DRV_IN, 2533 NULL, 0, SD_TIMEOUT, 2534 sdkp->max_retries, &exec_args); 2535 2536 2537 if (the_result > 0) { 2538 /* 2539 * If the drive has indicated to us that it doesn't 2540 * have any media in it, don't bother with any more 2541 * polling. 2542 */ 2543 if (media_not_present(sdkp, &sshdr)) { 2544 if (media_was_present) 2545 sd_printk(KERN_NOTICE, sdkp, 2546 "Media removed, stopped polling\n"); 2547 return; 2548 } 2549 sense_valid = scsi_sense_valid(&sshdr); 2550 } 2551 2552 if (!scsi_status_is_check_condition(the_result)) { 2553 /* no sense, TUR either succeeded or failed 2554 * with a status error */ 2555 if(!spintime && !scsi_status_is_good(the_result)) { 2556 sd_print_result(sdkp, "Test Unit Ready failed", 2557 the_result); 2558 } 2559 break; 2560 } 2561 2562 /* 2563 * The device does not want the automatic start to be issued. 2564 */ 2565 if (sdkp->device->no_start_on_add) 2566 break; 2567 2568 if (sense_valid && sshdr.sense_key == NOT_READY) { 2569 if (sshdr.asc == 4 && sshdr.ascq == 3) 2570 break; /* manual intervention required */ 2571 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 2572 break; /* standby */ 2573 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 2574 break; /* unavailable */ 2575 if (sshdr.asc == 4 && sshdr.ascq == 0x1b) 2576 break; /* sanitize in progress */ 2577 if (sshdr.asc == 4 && sshdr.ascq == 0x24) 2578 break; /* depopulation in progress */ 2579 if (sshdr.asc == 4 && sshdr.ascq == 0x25) 2580 break; /* depopulation restoration in progress */ 2581 /* 2582 * Issue command to spin up drive when not ready 2583 */ 2584 if (!spintime) { 2585 /* Return immediately and start spin cycle */ 2586 const u8 start_cmd[10] = { 2587 [0] = START_STOP, 2588 [1] = 1, 2589 [4] = sdkp->device->start_stop_pwr_cond ? 2590 0x11 : 1, 2591 }; 2592 2593 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 2594 scsi_execute_cmd(sdkp->device, start_cmd, 2595 REQ_OP_DRV_IN, NULL, 0, 2596 SD_TIMEOUT, sdkp->max_retries, 2597 &exec_args); 2598 spintime_expire = jiffies + 100 * HZ; 2599 spintime = 1; 2600 } 2601 /* Wait 1 second for next try */ 2602 msleep(1000); 2603 printk(KERN_CONT "."); 2604 2605 /* 2606 * Wait for USB flash devices with slow firmware. 2607 * Yes, this sense key/ASC combination shouldn't 2608 * occur here. It's characteristic of these devices. 2609 */ 2610 } else if (sense_valid && 2611 sshdr.sense_key == UNIT_ATTENTION && 2612 sshdr.asc == 0x28) { 2613 if (!spintime) { 2614 spintime_expire = jiffies + 5 * HZ; 2615 spintime = 1; 2616 } 2617 /* Wait 1 second for next try */ 2618 msleep(1000); 2619 } else { 2620 /* we don't understand the sense code, so it's 2621 * probably pointless to loop */ 2622 if(!spintime) { 2623 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 2624 sd_print_sense_hdr(sdkp, &sshdr); 2625 } 2626 break; 2627 } 2628 2629 } while (spintime && time_before_eq(jiffies, spintime_expire)); 2630 2631 if (spintime) { 2632 if (scsi_status_is_good(the_result)) 2633 printk(KERN_CONT "ready\n"); 2634 else 2635 printk(KERN_CONT "not responding...\n"); 2636 } 2637 } 2638 2639 /* 2640 * Determine whether disk supports Data Integrity Field. 2641 */ 2642 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 2643 { 2644 struct scsi_device *sdp = sdkp->device; 2645 u8 type; 2646 2647 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) { 2648 sdkp->protection_type = 0; 2649 return 0; 2650 } 2651 2652 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 2653 2654 if (type > T10_PI_TYPE3_PROTECTION) { 2655 sd_printk(KERN_ERR, sdkp, 2656 "formatted with unsupported protection type %u. Disabling disk!\n", 2657 type); 2658 sdkp->protection_type = 0; 2659 return -ENODEV; 2660 } 2661 2662 sdkp->protection_type = type; 2663 2664 return 0; 2665 } 2666 2667 static void sd_config_protection(struct scsi_disk *sdkp, 2668 struct queue_limits *lim) 2669 { 2670 struct scsi_device *sdp = sdkp->device; 2671 2672 if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)) 2673 sd_dif_config_host(sdkp, lim); 2674 2675 if (!sdkp->protection_type) 2676 return; 2677 2678 if (!scsi_host_dif_capable(sdp->host, sdkp->protection_type)) { 2679 sd_first_printk(KERN_NOTICE, sdkp, 2680 "Disabling DIF Type %u protection\n", 2681 sdkp->protection_type); 2682 sdkp->protection_type = 0; 2683 } 2684 2685 sd_first_printk(KERN_NOTICE, sdkp, "Enabling DIF Type %u protection\n", 2686 sdkp->protection_type); 2687 } 2688 2689 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 2690 struct scsi_sense_hdr *sshdr, int sense_valid, 2691 int the_result) 2692 { 2693 if (sense_valid) 2694 sd_print_sense_hdr(sdkp, sshdr); 2695 else 2696 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 2697 2698 /* 2699 * Set dirty bit for removable devices if not ready - 2700 * sometimes drives will not report this properly. 2701 */ 2702 if (sdp->removable && 2703 sense_valid && sshdr->sense_key == NOT_READY) 2704 set_media_not_present(sdkp); 2705 2706 /* 2707 * We used to set media_present to 0 here to indicate no media 2708 * in the drive, but some drives fail read capacity even with 2709 * media present, so we can't do that. 2710 */ 2711 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 2712 } 2713 2714 #define RC16_LEN 32 2715 #if RC16_LEN > SD_BUF_SIZE 2716 #error RC16_LEN must not be more than SD_BUF_SIZE 2717 #endif 2718 2719 #define READ_CAPACITY_RETRIES_ON_RESET 10 2720 2721 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 2722 struct queue_limits *lim, unsigned char *buffer) 2723 { 2724 unsigned char cmd[16]; 2725 struct scsi_sense_hdr sshdr; 2726 const struct scsi_exec_args exec_args = { 2727 .sshdr = &sshdr, 2728 }; 2729 int sense_valid = 0; 2730 int the_result; 2731 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2732 unsigned int alignment; 2733 unsigned long long lba; 2734 unsigned sector_size; 2735 2736 if (sdp->no_read_capacity_16) 2737 return -EINVAL; 2738 2739 do { 2740 memset(cmd, 0, 16); 2741 cmd[0] = SERVICE_ACTION_IN_16; 2742 cmd[1] = SAI_READ_CAPACITY_16; 2743 cmd[13] = RC16_LEN; 2744 memset(buffer, 0, RC16_LEN); 2745 2746 the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, 2747 buffer, RC16_LEN, SD_TIMEOUT, 2748 sdkp->max_retries, &exec_args); 2749 if (the_result > 0) { 2750 if (media_not_present(sdkp, &sshdr)) 2751 return -ENODEV; 2752 2753 sense_valid = scsi_sense_valid(&sshdr); 2754 if (sense_valid && 2755 sshdr.sense_key == ILLEGAL_REQUEST && 2756 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 2757 sshdr.ascq == 0x00) 2758 /* Invalid Command Operation Code or 2759 * Invalid Field in CDB, just retry 2760 * silently with RC10 */ 2761 return -EINVAL; 2762 if (sense_valid && 2763 sshdr.sense_key == UNIT_ATTENTION && 2764 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2765 /* Device reset might occur several times, 2766 * give it one more chance */ 2767 if (--reset_retries > 0) 2768 continue; 2769 } 2770 retries--; 2771 2772 } while (the_result && retries); 2773 2774 if (the_result) { 2775 sd_print_result(sdkp, "Read Capacity(16) failed", the_result); 2776 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2777 return -EINVAL; 2778 } 2779 2780 sector_size = get_unaligned_be32(&buffer[8]); 2781 lba = get_unaligned_be64(&buffer[0]); 2782 2783 if (sd_read_protection_type(sdkp, buffer) < 0) { 2784 sdkp->capacity = 0; 2785 return -ENODEV; 2786 } 2787 2788 /* Logical blocks per physical block exponent */ 2789 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 2790 2791 /* RC basis */ 2792 sdkp->rc_basis = (buffer[12] >> 4) & 0x3; 2793 2794 /* Lowest aligned logical block */ 2795 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 2796 lim->alignment_offset = alignment; 2797 if (alignment && sdkp->first_scan) 2798 sd_printk(KERN_NOTICE, sdkp, 2799 "physical block alignment offset: %u\n", alignment); 2800 2801 if (buffer[14] & 0x80) { /* LBPME */ 2802 sdkp->lbpme = 1; 2803 2804 if (buffer[14] & 0x40) /* LBPRZ */ 2805 sdkp->lbprz = 1; 2806 } 2807 2808 sdkp->capacity = lba + 1; 2809 return sector_size; 2810 } 2811 2812 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 2813 unsigned char *buffer) 2814 { 2815 static const u8 cmd[10] = { READ_CAPACITY }; 2816 struct scsi_sense_hdr sshdr; 2817 struct scsi_failure failure_defs[] = { 2818 /* Do not retry Medium Not Present */ 2819 { 2820 .sense = UNIT_ATTENTION, 2821 .asc = 0x3A, 2822 .result = SAM_STAT_CHECK_CONDITION, 2823 }, 2824 { 2825 .sense = NOT_READY, 2826 .asc = 0x3A, 2827 .result = SAM_STAT_CHECK_CONDITION, 2828 }, 2829 /* Device reset might occur several times so retry a lot */ 2830 { 2831 .sense = UNIT_ATTENTION, 2832 .asc = 0x29, 2833 .allowed = READ_CAPACITY_RETRIES_ON_RESET, 2834 .result = SAM_STAT_CHECK_CONDITION, 2835 }, 2836 /* Any other error not listed above retry 3 times */ 2837 { 2838 .result = SCMD_FAILURE_RESULT_ANY, 2839 .allowed = 3, 2840 }, 2841 {} 2842 }; 2843 struct scsi_failures failures = { 2844 .failure_definitions = failure_defs, 2845 }; 2846 const struct scsi_exec_args exec_args = { 2847 .sshdr = &sshdr, 2848 .failures = &failures, 2849 }; 2850 int sense_valid = 0; 2851 int the_result; 2852 sector_t lba; 2853 unsigned sector_size; 2854 2855 memset(buffer, 0, 8); 2856 2857 the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, buffer, 2858 8, SD_TIMEOUT, sdkp->max_retries, 2859 &exec_args); 2860 2861 if (the_result > 0) { 2862 sense_valid = scsi_sense_valid(&sshdr); 2863 2864 if (media_not_present(sdkp, &sshdr)) 2865 return -ENODEV; 2866 } 2867 2868 if (the_result) { 2869 sd_print_result(sdkp, "Read Capacity(10) failed", the_result); 2870 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2871 return -EINVAL; 2872 } 2873 2874 sector_size = get_unaligned_be32(&buffer[4]); 2875 lba = get_unaligned_be32(&buffer[0]); 2876 2877 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 2878 /* Some buggy (usb cardreader) devices return an lba of 2879 0xffffffff when the want to report a size of 0 (with 2880 which they really mean no media is present) */ 2881 sdkp->capacity = 0; 2882 sdkp->physical_block_size = sector_size; 2883 return sector_size; 2884 } 2885 2886 sdkp->capacity = lba + 1; 2887 sdkp->physical_block_size = sector_size; 2888 return sector_size; 2889 } 2890 2891 static int sd_try_rc16_first(struct scsi_device *sdp) 2892 { 2893 if (sdp->host->max_cmd_len < 16) 2894 return 0; 2895 if (sdp->try_rc_10_first) 2896 return 0; 2897 if (sdp->scsi_level > SCSI_SPC_2) 2898 return 1; 2899 if (scsi_device_protection(sdp)) 2900 return 1; 2901 return 0; 2902 } 2903 2904 /* 2905 * read disk capacity 2906 */ 2907 static void 2908 sd_read_capacity(struct scsi_disk *sdkp, struct queue_limits *lim, 2909 unsigned char *buffer) 2910 { 2911 int sector_size; 2912 struct scsi_device *sdp = sdkp->device; 2913 2914 if (sd_try_rc16_first(sdp)) { 2915 sector_size = read_capacity_16(sdkp, sdp, lim, buffer); 2916 if (sector_size == -EOVERFLOW) 2917 goto got_data; 2918 if (sector_size == -ENODEV) 2919 return; 2920 if (sector_size < 0) 2921 sector_size = read_capacity_10(sdkp, sdp, buffer); 2922 if (sector_size < 0) 2923 return; 2924 } else { 2925 sector_size = read_capacity_10(sdkp, sdp, buffer); 2926 if (sector_size == -EOVERFLOW) 2927 goto got_data; 2928 if (sector_size < 0) 2929 return; 2930 if ((sizeof(sdkp->capacity) > 4) && 2931 (sdkp->capacity > 0xffffffffULL)) { 2932 int old_sector_size = sector_size; 2933 sd_printk(KERN_NOTICE, sdkp, 2934 "Very big device. Trying to use READ CAPACITY(16).\n"); 2935 sector_size = read_capacity_16(sdkp, sdp, lim, buffer); 2936 if (sector_size < 0) { 2937 sd_printk(KERN_NOTICE, sdkp, 2938 "Using 0xffffffff as device size\n"); 2939 sdkp->capacity = 1 + (sector_t) 0xffffffff; 2940 sector_size = old_sector_size; 2941 goto got_data; 2942 } 2943 /* Remember that READ CAPACITY(16) succeeded */ 2944 sdp->try_rc_10_first = 0; 2945 } 2946 } 2947 2948 /* Some devices are known to return the total number of blocks, 2949 * not the highest block number. Some devices have versions 2950 * which do this and others which do not. Some devices we might 2951 * suspect of doing this but we don't know for certain. 2952 * 2953 * If we know the reported capacity is wrong, decrement it. If 2954 * we can only guess, then assume the number of blocks is even 2955 * (usually true but not always) and err on the side of lowering 2956 * the capacity. 2957 */ 2958 if (sdp->fix_capacity || 2959 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 2960 sd_printk(KERN_INFO, sdkp, 2961 "Adjusting the sector count from its reported value: %llu\n", 2962 (unsigned long long) sdkp->capacity); 2963 --sdkp->capacity; 2964 } 2965 2966 got_data: 2967 if (sector_size == 0) { 2968 sector_size = 512; 2969 sd_printk(KERN_NOTICE, sdkp, 2970 "Sector size 0 reported, assuming 512.\n"); 2971 } 2972 2973 if (blk_validate_block_size(sector_size)) { 2974 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 2975 sector_size); 2976 /* 2977 * The user might want to re-format the drive with 2978 * a supported sectorsize. Once this happens, it 2979 * would be relatively trivial to set the thing up. 2980 * For this reason, we leave the thing in the table. 2981 */ 2982 sdkp->capacity = 0; 2983 /* 2984 * set a bogus sector size so the normal read/write 2985 * logic in the block layer will eventually refuse any 2986 * request on this device without tripping over power 2987 * of two sector size assumptions 2988 */ 2989 sector_size = 512; 2990 } 2991 lim->logical_block_size = sector_size; 2992 lim->physical_block_size = sdkp->physical_block_size; 2993 sdkp->device->sector_size = sector_size; 2994 2995 if (sdkp->capacity > 0xffffffff) 2996 sdp->use_16_for_rw = 1; 2997 2998 } 2999 3000 /* 3001 * Print disk capacity 3002 */ 3003 static void 3004 sd_print_capacity(struct scsi_disk *sdkp, 3005 sector_t old_capacity) 3006 { 3007 int sector_size = sdkp->device->sector_size; 3008 char cap_str_2[10], cap_str_10[10]; 3009 3010 if (!sdkp->first_scan && old_capacity == sdkp->capacity) 3011 return; 3012 3013 string_get_size(sdkp->capacity, sector_size, 3014 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); 3015 string_get_size(sdkp->capacity, sector_size, 3016 STRING_UNITS_10, cap_str_10, sizeof(cap_str_10)); 3017 3018 sd_printk(KERN_NOTICE, sdkp, 3019 "%llu %d-byte logical blocks: (%s/%s)\n", 3020 (unsigned long long)sdkp->capacity, 3021 sector_size, cap_str_10, cap_str_2); 3022 3023 if (sdkp->physical_block_size != sector_size) 3024 sd_printk(KERN_NOTICE, sdkp, 3025 "%u-byte physical blocks\n", 3026 sdkp->physical_block_size); 3027 } 3028 3029 /* called with buffer of length 512 */ 3030 static inline int 3031 sd_do_mode_sense(struct scsi_disk *sdkp, int dbd, int modepage, 3032 unsigned char *buffer, int len, struct scsi_mode_data *data, 3033 struct scsi_sense_hdr *sshdr) 3034 { 3035 /* 3036 * If we must use MODE SENSE(10), make sure that the buffer length 3037 * is at least 8 bytes so that the mode sense header fits. 3038 */ 3039 if (sdkp->device->use_10_for_ms && len < 8) 3040 len = 8; 3041 3042 return scsi_mode_sense(sdkp->device, dbd, modepage, 0, buffer, len, 3043 SD_TIMEOUT, sdkp->max_retries, data, sshdr); 3044 } 3045 3046 /* 3047 * read write protect setting, if possible - called only in sd_revalidate_disk() 3048 * called with buffer of length SD_BUF_SIZE 3049 */ 3050 static void 3051 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 3052 { 3053 int res; 3054 struct scsi_device *sdp = sdkp->device; 3055 struct scsi_mode_data data; 3056 int old_wp = sdkp->write_prot; 3057 3058 set_disk_ro(sdkp->disk, 0); 3059 if (sdp->skip_ms_page_3f) { 3060 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 3061 return; 3062 } 3063 3064 if (sdp->use_192_bytes_for_3f) { 3065 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 192, &data, NULL); 3066 } else { 3067 /* 3068 * First attempt: ask for all pages (0x3F), but only 4 bytes. 3069 * We have to start carefully: some devices hang if we ask 3070 * for more than is available. 3071 */ 3072 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 4, &data, NULL); 3073 3074 /* 3075 * Second attempt: ask for page 0 When only page 0 is 3076 * implemented, a request for page 3F may return Sense Key 3077 * 5: Illegal Request, Sense Code 24: Invalid field in 3078 * CDB. 3079 */ 3080 if (res < 0) 3081 res = sd_do_mode_sense(sdkp, 0, 0, buffer, 4, &data, NULL); 3082 3083 /* 3084 * Third attempt: ask 255 bytes, as we did earlier. 3085 */ 3086 if (res < 0) 3087 res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 255, 3088 &data, NULL); 3089 } 3090 3091 if (res < 0) { 3092 sd_first_printk(KERN_WARNING, sdkp, 3093 "Test WP failed, assume Write Enabled\n"); 3094 } else { 3095 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 3096 set_disk_ro(sdkp->disk, sdkp->write_prot); 3097 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 3098 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 3099 sdkp->write_prot ? "on" : "off"); 3100 sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer); 3101 } 3102 } 3103 } 3104 3105 /* 3106 * sd_read_cache_type - called only from sd_revalidate_disk() 3107 * called with buffer of length SD_BUF_SIZE 3108 */ 3109 static void 3110 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 3111 { 3112 int len = 0, res; 3113 struct scsi_device *sdp = sdkp->device; 3114 3115 int dbd; 3116 int modepage; 3117 int first_len; 3118 struct scsi_mode_data data; 3119 struct scsi_sense_hdr sshdr; 3120 int old_wce = sdkp->WCE; 3121 int old_rcd = sdkp->RCD; 3122 int old_dpofua = sdkp->DPOFUA; 3123 3124 3125 if (sdkp->cache_override) 3126 return; 3127 3128 first_len = 4; 3129 if (sdp->skip_ms_page_8) { 3130 if (sdp->type == TYPE_RBC) 3131 goto defaults; 3132 else { 3133 if (sdp->skip_ms_page_3f) 3134 goto defaults; 3135 modepage = 0x3F; 3136 if (sdp->use_192_bytes_for_3f) 3137 first_len = 192; 3138 dbd = 0; 3139 } 3140 } else if (sdp->type == TYPE_RBC) { 3141 modepage = 6; 3142 dbd = 8; 3143 } else { 3144 modepage = 8; 3145 dbd = 0; 3146 } 3147 3148 /* cautiously ask */ 3149 res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, first_len, 3150 &data, &sshdr); 3151 3152 if (res < 0) 3153 goto bad_sense; 3154 3155 if (!data.header_length) { 3156 modepage = 6; 3157 first_len = 0; 3158 sd_first_printk(KERN_ERR, sdkp, 3159 "Missing header in MODE_SENSE response\n"); 3160 } 3161 3162 /* that went OK, now ask for the proper length */ 3163 len = data.length; 3164 3165 /* 3166 * We're only interested in the first three bytes, actually. 3167 * But the data cache page is defined for the first 20. 3168 */ 3169 if (len < 3) 3170 goto bad_sense; 3171 else if (len > SD_BUF_SIZE) { 3172 sd_first_printk(KERN_NOTICE, sdkp, 3173 "Truncating mode parameter data from %d to %d bytes\n", 3174 len, SD_BUF_SIZE); 3175 len = SD_BUF_SIZE; 3176 } 3177 if (modepage == 0x3F && sdp->use_192_bytes_for_3f) 3178 len = 192; 3179 3180 /* Get the data */ 3181 if (len > first_len) 3182 res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, len, 3183 &data, &sshdr); 3184 3185 if (!res) { 3186 int offset = data.header_length + data.block_descriptor_length; 3187 3188 while (offset < len) { 3189 u8 page_code = buffer[offset] & 0x3F; 3190 u8 spf = buffer[offset] & 0x40; 3191 3192 if (page_code == 8 || page_code == 6) { 3193 /* We're interested only in the first 3 bytes. 3194 */ 3195 if (len - offset <= 2) { 3196 sd_first_printk(KERN_ERR, sdkp, 3197 "Incomplete mode parameter data\n"); 3198 goto defaults; 3199 } else { 3200 modepage = page_code; 3201 goto Page_found; 3202 } 3203 } else { 3204 /* Go to the next page */ 3205 if (spf && len - offset > 3) 3206 offset += 4 + (buffer[offset+2] << 8) + 3207 buffer[offset+3]; 3208 else if (!spf && len - offset > 1) 3209 offset += 2 + buffer[offset+1]; 3210 else { 3211 sd_first_printk(KERN_ERR, sdkp, 3212 "Incomplete mode parameter data\n"); 3213 goto defaults; 3214 } 3215 } 3216 } 3217 3218 sd_first_printk(KERN_WARNING, sdkp, 3219 "No Caching mode page found\n"); 3220 goto defaults; 3221 3222 Page_found: 3223 if (modepage == 8) { 3224 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 3225 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 3226 } else { 3227 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 3228 sdkp->RCD = 0; 3229 } 3230 3231 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 3232 if (sdp->broken_fua) { 3233 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n"); 3234 sdkp->DPOFUA = 0; 3235 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw && 3236 !sdkp->device->use_16_for_rw) { 3237 sd_first_printk(KERN_NOTICE, sdkp, 3238 "Uses READ/WRITE(6), disabling FUA\n"); 3239 sdkp->DPOFUA = 0; 3240 } 3241 3242 /* No cache flush allowed for write protected devices */ 3243 if (sdkp->WCE && sdkp->write_prot) 3244 sdkp->WCE = 0; 3245 3246 if (sdkp->first_scan || old_wce != sdkp->WCE || 3247 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 3248 sd_printk(KERN_NOTICE, sdkp, 3249 "Write cache: %s, read cache: %s, %s\n", 3250 sdkp->WCE ? "enabled" : "disabled", 3251 sdkp->RCD ? "disabled" : "enabled", 3252 sdkp->DPOFUA ? "supports DPO and FUA" 3253 : "doesn't support DPO or FUA"); 3254 3255 return; 3256 } 3257 3258 bad_sense: 3259 if (res == -EIO && scsi_sense_valid(&sshdr) && 3260 sshdr.sense_key == ILLEGAL_REQUEST && 3261 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 3262 /* Invalid field in CDB */ 3263 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 3264 else 3265 sd_first_printk(KERN_ERR, sdkp, 3266 "Asking for cache data failed\n"); 3267 3268 defaults: 3269 if (sdp->wce_default_on) { 3270 sd_first_printk(KERN_NOTICE, sdkp, 3271 "Assuming drive cache: write back\n"); 3272 sdkp->WCE = 1; 3273 } else { 3274 sd_first_printk(KERN_WARNING, sdkp, 3275 "Assuming drive cache: write through\n"); 3276 sdkp->WCE = 0; 3277 } 3278 sdkp->RCD = 0; 3279 sdkp->DPOFUA = 0; 3280 } 3281 3282 static bool sd_is_perm_stream(struct scsi_disk *sdkp, unsigned int stream_id) 3283 { 3284 u8 cdb[16] = { SERVICE_ACTION_IN_16, SAI_GET_STREAM_STATUS }; 3285 struct { 3286 struct scsi_stream_status_header h; 3287 struct scsi_stream_status s; 3288 } buf; 3289 struct scsi_device *sdev = sdkp->device; 3290 struct scsi_sense_hdr sshdr; 3291 const struct scsi_exec_args exec_args = { 3292 .sshdr = &sshdr, 3293 }; 3294 int res; 3295 3296 put_unaligned_be16(stream_id, &cdb[4]); 3297 put_unaligned_be32(sizeof(buf), &cdb[10]); 3298 3299 res = scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, &buf, sizeof(buf), 3300 SD_TIMEOUT, sdkp->max_retries, &exec_args); 3301 if (res < 0) 3302 return false; 3303 if (scsi_status_is_check_condition(res) && scsi_sense_valid(&sshdr)) 3304 sd_print_sense_hdr(sdkp, &sshdr); 3305 if (res) 3306 return false; 3307 if (get_unaligned_be32(&buf.h.len) < sizeof(struct scsi_stream_status)) 3308 return false; 3309 return buf.s.perm; 3310 } 3311 3312 static void sd_read_io_hints(struct scsi_disk *sdkp, unsigned char *buffer) 3313 { 3314 struct scsi_device *sdp = sdkp->device; 3315 const struct scsi_io_group_descriptor *desc, *start, *end; 3316 u16 permanent_stream_count_old; 3317 struct scsi_sense_hdr sshdr; 3318 struct scsi_mode_data data; 3319 int res; 3320 3321 if (sdp->sdev_bflags & BLIST_SKIP_IO_HINTS) 3322 return; 3323 3324 res = scsi_mode_sense(sdp, /*dbd=*/0x8, /*modepage=*/0x0a, 3325 /*subpage=*/0x05, buffer, SD_BUF_SIZE, SD_TIMEOUT, 3326 sdkp->max_retries, &data, &sshdr); 3327 if (res < 0) 3328 return; 3329 start = (void *)buffer + data.header_length + 16; 3330 end = (void *)buffer + ALIGN_DOWN(data.header_length + data.length, 3331 sizeof(*end)); 3332 /* 3333 * From "SBC-5 Constrained Streams with Data Lifetimes": Device severs 3334 * should assign the lowest numbered stream identifiers to permanent 3335 * streams. 3336 */ 3337 for (desc = start; desc < end; desc++) 3338 if (!desc->st_enble || !sd_is_perm_stream(sdkp, desc - start)) 3339 break; 3340 permanent_stream_count_old = sdkp->permanent_stream_count; 3341 sdkp->permanent_stream_count = desc - start; 3342 if (sdkp->rscs && sdkp->permanent_stream_count < 2) 3343 sd_printk(KERN_INFO, sdkp, 3344 "Unexpected: RSCS has been set and the permanent stream count is %u\n", 3345 sdkp->permanent_stream_count); 3346 else if (sdkp->permanent_stream_count != permanent_stream_count_old) 3347 sd_printk(KERN_INFO, sdkp, "permanent stream count = %d\n", 3348 sdkp->permanent_stream_count); 3349 } 3350 3351 /* 3352 * The ATO bit indicates whether the DIF application tag is available 3353 * for use by the operating system. 3354 */ 3355 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 3356 { 3357 int res, offset; 3358 struct scsi_device *sdp = sdkp->device; 3359 struct scsi_mode_data data; 3360 struct scsi_sense_hdr sshdr; 3361 3362 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 3363 return; 3364 3365 if (sdkp->protection_type == 0) 3366 return; 3367 3368 res = scsi_mode_sense(sdp, 1, 0x0a, 0, buffer, 36, SD_TIMEOUT, 3369 sdkp->max_retries, &data, &sshdr); 3370 3371 if (res < 0 || !data.header_length || 3372 data.length < 6) { 3373 sd_first_printk(KERN_WARNING, sdkp, 3374 "getting Control mode page failed, assume no ATO\n"); 3375 3376 if (res == -EIO && scsi_sense_valid(&sshdr)) 3377 sd_print_sense_hdr(sdkp, &sshdr); 3378 3379 return; 3380 } 3381 3382 offset = data.header_length + data.block_descriptor_length; 3383 3384 if ((buffer[offset] & 0x3f) != 0x0a) { 3385 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 3386 return; 3387 } 3388 3389 if ((buffer[offset + 5] & 0x80) == 0) 3390 return; 3391 3392 sdkp->ATO = 1; 3393 3394 return; 3395 } 3396 3397 static unsigned int sd_discard_mode(struct scsi_disk *sdkp) 3398 { 3399 if (!sdkp->lbpme) 3400 return SD_LBP_FULL; 3401 3402 if (!sdkp->lbpvpd) { 3403 /* LBP VPD page not provided */ 3404 if (sdkp->max_unmap_blocks) 3405 return SD_LBP_UNMAP; 3406 return SD_LBP_WS16; 3407 } 3408 3409 /* LBP VPD page tells us what to use */ 3410 if (sdkp->lbpu && sdkp->max_unmap_blocks) 3411 return SD_LBP_UNMAP; 3412 if (sdkp->lbpws) 3413 return SD_LBP_WS16; 3414 if (sdkp->lbpws10) 3415 return SD_LBP_WS10; 3416 return SD_LBP_DISABLE; 3417 } 3418 3419 /* 3420 * Query disk device for preferred I/O sizes. 3421 */ 3422 static void sd_read_block_limits(struct scsi_disk *sdkp, 3423 struct queue_limits *lim) 3424 { 3425 struct scsi_vpd *vpd; 3426 3427 rcu_read_lock(); 3428 3429 vpd = rcu_dereference(sdkp->device->vpd_pgb0); 3430 if (!vpd || vpd->len < 16) 3431 goto out; 3432 3433 sdkp->min_xfer_blocks = get_unaligned_be16(&vpd->data[6]); 3434 sdkp->max_xfer_blocks = get_unaligned_be32(&vpd->data[8]); 3435 sdkp->opt_xfer_blocks = get_unaligned_be32(&vpd->data[12]); 3436 3437 if (vpd->len >= 64) { 3438 unsigned int lba_count, desc_count; 3439 3440 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&vpd->data[36]); 3441 3442 if (!sdkp->lbpme) 3443 goto config_atomic; 3444 3445 lba_count = get_unaligned_be32(&vpd->data[20]); 3446 desc_count = get_unaligned_be32(&vpd->data[24]); 3447 3448 if (lba_count && desc_count) 3449 sdkp->max_unmap_blocks = lba_count; 3450 3451 sdkp->unmap_granularity = get_unaligned_be32(&vpd->data[28]); 3452 3453 if (vpd->data[32] & 0x80) 3454 sdkp->unmap_alignment = 3455 get_unaligned_be32(&vpd->data[32]) & ~(1 << 31); 3456 3457 config_atomic: 3458 sdkp->max_atomic = get_unaligned_be32(&vpd->data[44]); 3459 sdkp->atomic_alignment = get_unaligned_be32(&vpd->data[48]); 3460 sdkp->atomic_granularity = get_unaligned_be32(&vpd->data[52]); 3461 sdkp->max_atomic_with_boundary = get_unaligned_be32(&vpd->data[56]); 3462 sdkp->max_atomic_boundary = get_unaligned_be32(&vpd->data[60]); 3463 3464 sd_config_atomic(sdkp, lim); 3465 } 3466 3467 out: 3468 rcu_read_unlock(); 3469 } 3470 3471 /* Parse the Block Limits Extension VPD page (0xb7) */ 3472 static void sd_read_block_limits_ext(struct scsi_disk *sdkp) 3473 { 3474 struct scsi_vpd *vpd; 3475 3476 rcu_read_lock(); 3477 vpd = rcu_dereference(sdkp->device->vpd_pgb7); 3478 if (vpd && vpd->len >= 6) 3479 sdkp->rscs = vpd->data[5] & 1; 3480 rcu_read_unlock(); 3481 } 3482 3483 /* Query block device characteristics */ 3484 static void sd_read_block_characteristics(struct scsi_disk *sdkp, 3485 struct queue_limits *lim) 3486 { 3487 struct scsi_vpd *vpd; 3488 u16 rot; 3489 3490 rcu_read_lock(); 3491 vpd = rcu_dereference(sdkp->device->vpd_pgb1); 3492 3493 if (!vpd || vpd->len <= 8) { 3494 rcu_read_unlock(); 3495 return; 3496 } 3497 3498 rot = get_unaligned_be16(&vpd->data[4]); 3499 sdkp->zoned = (vpd->data[8] >> 4) & 3; 3500 rcu_read_unlock(); 3501 3502 if (rot == 1) 3503 lim->features &= ~(BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM); 3504 3505 if (!sdkp->first_scan) 3506 return; 3507 3508 if (sdkp->device->type == TYPE_ZBC) 3509 sd_printk(KERN_NOTICE, sdkp, "Host-managed zoned block device\n"); 3510 else if (sdkp->zoned == 1) 3511 sd_printk(KERN_NOTICE, sdkp, "Host-aware SMR disk used as regular disk\n"); 3512 else if (sdkp->zoned == 2) 3513 sd_printk(KERN_NOTICE, sdkp, "Drive-managed SMR disk\n"); 3514 } 3515 3516 /** 3517 * sd_read_block_provisioning - Query provisioning VPD page 3518 * @sdkp: disk to query 3519 */ 3520 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 3521 { 3522 struct scsi_vpd *vpd; 3523 3524 if (sdkp->lbpme == 0) 3525 return; 3526 3527 rcu_read_lock(); 3528 vpd = rcu_dereference(sdkp->device->vpd_pgb2); 3529 3530 if (!vpd || vpd->len < 8) { 3531 rcu_read_unlock(); 3532 return; 3533 } 3534 3535 sdkp->lbpvpd = 1; 3536 sdkp->lbpu = (vpd->data[5] >> 7) & 1; /* UNMAP */ 3537 sdkp->lbpws = (vpd->data[5] >> 6) & 1; /* WRITE SAME(16) w/ UNMAP */ 3538 sdkp->lbpws10 = (vpd->data[5] >> 5) & 1; /* WRITE SAME(10) w/ UNMAP */ 3539 rcu_read_unlock(); 3540 } 3541 3542 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) 3543 { 3544 struct scsi_device *sdev = sdkp->device; 3545 3546 if (sdev->host->no_write_same) { 3547 sdev->no_write_same = 1; 3548 3549 return; 3550 } 3551 3552 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY, 0) < 0) { 3553 sdev->no_report_opcodes = 1; 3554 3555 /* 3556 * Disable WRITE SAME if REPORT SUPPORTED OPERATION CODES is 3557 * unsupported and this is an ATA device. 3558 */ 3559 if (sdev->is_ata) 3560 sdev->no_write_same = 1; 3561 } 3562 3563 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16, 0) == 1) 3564 sdkp->ws16 = 1; 3565 3566 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME, 0) == 1) 3567 sdkp->ws10 = 1; 3568 } 3569 3570 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer) 3571 { 3572 struct scsi_device *sdev = sdkp->device; 3573 3574 if (!sdev->security_supported) 3575 return; 3576 3577 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, 3578 SECURITY_PROTOCOL_IN, 0) == 1 && 3579 scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, 3580 SECURITY_PROTOCOL_OUT, 0) == 1) 3581 sdkp->security = 1; 3582 } 3583 3584 static inline sector_t sd64_to_sectors(struct scsi_disk *sdkp, u8 *buf) 3585 { 3586 return logical_to_sectors(sdkp->device, get_unaligned_be64(buf)); 3587 } 3588 3589 /** 3590 * sd_read_cpr - Query concurrent positioning ranges 3591 * @sdkp: disk to query 3592 */ 3593 static void sd_read_cpr(struct scsi_disk *sdkp) 3594 { 3595 struct blk_independent_access_ranges *iars = NULL; 3596 unsigned char *buffer = NULL; 3597 unsigned int nr_cpr = 0; 3598 int i, vpd_len, buf_len = SD_BUF_SIZE; 3599 u8 *desc; 3600 3601 /* 3602 * We need to have the capacity set first for the block layer to be 3603 * able to check the ranges. 3604 */ 3605 if (sdkp->first_scan) 3606 return; 3607 3608 if (!sdkp->capacity) 3609 goto out; 3610 3611 /* 3612 * Concurrent Positioning Ranges VPD: there can be at most 256 ranges, 3613 * leading to a maximum page size of 64 + 256*32 bytes. 3614 */ 3615 buf_len = 64 + 256*32; 3616 buffer = kmalloc(buf_len, GFP_KERNEL); 3617 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb9, buffer, buf_len)) 3618 goto out; 3619 3620 /* We must have at least a 64B header and one 32B range descriptor */ 3621 vpd_len = get_unaligned_be16(&buffer[2]) + 4; 3622 if (vpd_len > buf_len || vpd_len < 64 + 32 || (vpd_len & 31)) { 3623 sd_printk(KERN_ERR, sdkp, 3624 "Invalid Concurrent Positioning Ranges VPD page\n"); 3625 goto out; 3626 } 3627 3628 nr_cpr = (vpd_len - 64) / 32; 3629 if (nr_cpr == 1) { 3630 nr_cpr = 0; 3631 goto out; 3632 } 3633 3634 iars = disk_alloc_independent_access_ranges(sdkp->disk, nr_cpr); 3635 if (!iars) { 3636 nr_cpr = 0; 3637 goto out; 3638 } 3639 3640 desc = &buffer[64]; 3641 for (i = 0; i < nr_cpr; i++, desc += 32) { 3642 if (desc[0] != i) { 3643 sd_printk(KERN_ERR, sdkp, 3644 "Invalid Concurrent Positioning Range number\n"); 3645 nr_cpr = 0; 3646 break; 3647 } 3648 3649 iars->ia_range[i].sector = sd64_to_sectors(sdkp, desc + 8); 3650 iars->ia_range[i].nr_sectors = sd64_to_sectors(sdkp, desc + 16); 3651 } 3652 3653 out: 3654 disk_set_independent_access_ranges(sdkp->disk, iars); 3655 if (nr_cpr && sdkp->nr_actuators != nr_cpr) { 3656 sd_printk(KERN_NOTICE, sdkp, 3657 "%u concurrent positioning ranges\n", nr_cpr); 3658 sdkp->nr_actuators = nr_cpr; 3659 } 3660 3661 kfree(buffer); 3662 } 3663 3664 static bool sd_validate_min_xfer_size(struct scsi_disk *sdkp) 3665 { 3666 struct scsi_device *sdp = sdkp->device; 3667 unsigned int min_xfer_bytes = 3668 logical_to_bytes(sdp, sdkp->min_xfer_blocks); 3669 3670 if (sdkp->min_xfer_blocks == 0) 3671 return false; 3672 3673 if (min_xfer_bytes & (sdkp->physical_block_size - 1)) { 3674 sd_first_printk(KERN_WARNING, sdkp, 3675 "Preferred minimum I/O size %u bytes not a multiple of physical block size (%u bytes)\n", 3676 min_xfer_bytes, sdkp->physical_block_size); 3677 sdkp->min_xfer_blocks = 0; 3678 return false; 3679 } 3680 3681 sd_first_printk(KERN_INFO, sdkp, "Preferred minimum I/O size %u bytes\n", 3682 min_xfer_bytes); 3683 return true; 3684 } 3685 3686 /* 3687 * Determine the device's preferred I/O size for reads and writes 3688 * unless the reported value is unreasonably small, large, not a 3689 * multiple of the physical block size, or simply garbage. 3690 */ 3691 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp, 3692 unsigned int dev_max) 3693 { 3694 struct scsi_device *sdp = sdkp->device; 3695 unsigned int opt_xfer_bytes = 3696 logical_to_bytes(sdp, sdkp->opt_xfer_blocks); 3697 unsigned int min_xfer_bytes = 3698 logical_to_bytes(sdp, sdkp->min_xfer_blocks); 3699 3700 if (sdkp->opt_xfer_blocks == 0) 3701 return false; 3702 3703 if (sdkp->opt_xfer_blocks > dev_max) { 3704 sd_first_printk(KERN_WARNING, sdkp, 3705 "Optimal transfer size %u logical blocks > dev_max (%u logical blocks)\n", 3706 sdkp->opt_xfer_blocks, dev_max); 3707 return false; 3708 } 3709 3710 if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) { 3711 sd_first_printk(KERN_WARNING, sdkp, 3712 "Optimal transfer size %u logical blocks > sd driver limit (%u logical blocks)\n", 3713 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS); 3714 return false; 3715 } 3716 3717 if (opt_xfer_bytes < PAGE_SIZE) { 3718 sd_first_printk(KERN_WARNING, sdkp, 3719 "Optimal transfer size %u bytes < PAGE_SIZE (%u bytes)\n", 3720 opt_xfer_bytes, (unsigned int)PAGE_SIZE); 3721 return false; 3722 } 3723 3724 if (min_xfer_bytes && opt_xfer_bytes % min_xfer_bytes) { 3725 sd_first_printk(KERN_WARNING, sdkp, 3726 "Optimal transfer size %u bytes not a multiple of preferred minimum block size (%u bytes)\n", 3727 opt_xfer_bytes, min_xfer_bytes); 3728 return false; 3729 } 3730 3731 if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) { 3732 sd_first_printk(KERN_WARNING, sdkp, 3733 "Optimal transfer size %u bytes not a multiple of physical block size (%u bytes)\n", 3734 opt_xfer_bytes, sdkp->physical_block_size); 3735 return false; 3736 } 3737 3738 sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n", 3739 opt_xfer_bytes); 3740 return true; 3741 } 3742 3743 static void sd_read_block_zero(struct scsi_disk *sdkp) 3744 { 3745 struct scsi_device *sdev = sdkp->device; 3746 unsigned int buf_len = sdev->sector_size; 3747 u8 *buffer, cmd[16] = { }; 3748 3749 buffer = kmalloc(buf_len, GFP_KERNEL); 3750 if (!buffer) 3751 return; 3752 3753 if (sdev->use_16_for_rw) { 3754 cmd[0] = READ_16; 3755 put_unaligned_be64(0, &cmd[2]); /* Logical block address 0 */ 3756 put_unaligned_be32(1, &cmd[10]);/* Transfer 1 logical block */ 3757 } else { 3758 cmd[0] = READ_10; 3759 put_unaligned_be32(0, &cmd[2]); /* Logical block address 0 */ 3760 put_unaligned_be16(1, &cmd[7]); /* Transfer 1 logical block */ 3761 } 3762 3763 scsi_execute_cmd(sdkp->device, cmd, REQ_OP_DRV_IN, buffer, buf_len, 3764 SD_TIMEOUT, sdkp->max_retries, NULL); 3765 kfree(buffer); 3766 } 3767 3768 /** 3769 * sd_revalidate_disk - called the first time a new disk is seen, 3770 * performs disk spin up, read_capacity, etc. 3771 * @disk: struct gendisk we care about 3772 **/ 3773 static void sd_revalidate_disk(struct gendisk *disk) 3774 { 3775 struct scsi_disk *sdkp = scsi_disk(disk); 3776 struct scsi_device *sdp = sdkp->device; 3777 sector_t old_capacity = sdkp->capacity; 3778 struct queue_limits *lim = NULL; 3779 unsigned char *buffer = NULL; 3780 unsigned int dev_max; 3781 int err; 3782 3783 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 3784 "sd_revalidate_disk\n")); 3785 3786 /* 3787 * If the device is offline, don't try and read capacity or any 3788 * of the other niceties. 3789 */ 3790 if (!scsi_device_online(sdp)) 3791 return; 3792 3793 lim = kmalloc_obj(*lim); 3794 if (!lim) 3795 return; 3796 3797 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 3798 if (!buffer) 3799 goto out; 3800 3801 sd_spinup_disk(sdkp); 3802 3803 *lim = queue_limits_start_update(sdkp->disk->queue); 3804 3805 /* 3806 * Without media there is no reason to ask; moreover, some devices 3807 * react badly if we do. 3808 */ 3809 if (sdkp->media_present) { 3810 sd_read_capacity(sdkp, lim, buffer); 3811 /* 3812 * Some USB/UAS devices return generic values for mode pages 3813 * until the media has been accessed. Trigger a READ operation 3814 * to force the device to populate mode pages. 3815 */ 3816 if (sdp->read_before_ms) 3817 sd_read_block_zero(sdkp); 3818 /* 3819 * set the default to rotational. All non-rotational devices 3820 * support the block characteristics VPD page, which will 3821 * cause this to be updated correctly and any device which 3822 * doesn't support it should be treated as rotational. 3823 */ 3824 lim->features |= (BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM); 3825 3826 if (scsi_device_supports_vpd(sdp)) { 3827 sd_read_block_provisioning(sdkp); 3828 sd_read_block_limits(sdkp, lim); 3829 sd_read_block_limits_ext(sdkp); 3830 sd_read_block_characteristics(sdkp, lim); 3831 sd_zbc_read_zones(sdkp, lim, buffer); 3832 } 3833 3834 sd_config_discard(sdkp, lim, sd_discard_mode(sdkp)); 3835 3836 sd_print_capacity(sdkp, old_capacity); 3837 3838 sd_read_write_protect_flag(sdkp, buffer); 3839 sd_read_cache_type(sdkp, buffer); 3840 sd_read_io_hints(sdkp, buffer); 3841 sd_read_app_tag_own(sdkp, buffer); 3842 sd_read_write_same(sdkp, buffer); 3843 sd_read_security(sdkp, buffer); 3844 sd_config_protection(sdkp, lim); 3845 } 3846 3847 /* 3848 * We now have all cache related info, determine how we deal 3849 * with flush requests. 3850 */ 3851 sd_set_flush_flag(sdkp, lim); 3852 3853 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */ 3854 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS; 3855 3856 /* Some devices report a maximum block count for READ/WRITE requests. */ 3857 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks); 3858 lim->max_dev_sectors = logical_to_sectors(sdp, dev_max); 3859 3860 if (sd_validate_min_xfer_size(sdkp)) 3861 lim->io_min = logical_to_bytes(sdp, sdkp->min_xfer_blocks); 3862 else 3863 lim->io_min = 0; 3864 3865 /* 3866 * Limit default to SCSI host optimal sector limit if set. There may be 3867 * an impact on performance for when the size of a request exceeds this 3868 * host limit. 3869 */ 3870 lim->io_opt = sdp->host->opt_sectors << SECTOR_SHIFT; 3871 if (sd_validate_opt_xfer_size(sdkp, dev_max)) { 3872 lim->io_opt = min_not_zero(lim->io_opt, 3873 logical_to_bytes(sdp, sdkp->opt_xfer_blocks)); 3874 } 3875 3876 sdkp->first_scan = 0; 3877 3878 set_capacity_and_notify(disk, logical_to_sectors(sdp, sdkp->capacity)); 3879 sd_config_write_same(sdkp, lim); 3880 3881 err = queue_limits_commit_update_frozen(sdkp->disk->queue, lim); 3882 if (err) 3883 goto out; 3884 3885 /* 3886 * Query concurrent positioning ranges after 3887 * queue_limits_commit_update() unlocked q->limits_lock to avoid 3888 * deadlock with q->sysfs_dir_lock and q->sysfs_lock. 3889 */ 3890 if (sdkp->media_present && scsi_device_supports_vpd(sdp)) 3891 sd_read_cpr(sdkp); 3892 3893 /* 3894 * For a zoned drive, revalidating the zones can be done only once 3895 * the gendisk capacity is set. So if this fails, set back the gendisk 3896 * capacity to 0. 3897 */ 3898 if (sd_zbc_revalidate_zones(sdkp)) 3899 set_capacity_and_notify(disk, 0); 3900 3901 out: 3902 kfree(buffer); 3903 kfree(lim); 3904 3905 } 3906 3907 /** 3908 * sd_unlock_native_capacity - unlock native capacity 3909 * @disk: struct gendisk to set capacity for 3910 * 3911 * Block layer calls this function if it detects that partitions 3912 * on @disk reach beyond the end of the device. If the SCSI host 3913 * implements ->unlock_native_capacity() method, it's invoked to 3914 * give it a chance to adjust the device capacity. 3915 * 3916 * CONTEXT: 3917 * Defined by block layer. Might sleep. 3918 */ 3919 static void sd_unlock_native_capacity(struct gendisk *disk) 3920 { 3921 struct scsi_device *sdev = scsi_disk(disk)->device; 3922 3923 if (sdev->host->hostt->unlock_native_capacity) 3924 sdev->host->hostt->unlock_native_capacity(sdev); 3925 } 3926 3927 static const struct block_device_operations sd_fops = { 3928 .owner = THIS_MODULE, 3929 .open = sd_open, 3930 .release = sd_release, 3931 .ioctl = sd_ioctl, 3932 .getgeo = sd_getgeo, 3933 .compat_ioctl = blkdev_compat_ptr_ioctl, 3934 .check_events = sd_check_events, 3935 .unlock_native_capacity = sd_unlock_native_capacity, 3936 .report_zones = sd_zbc_report_zones, 3937 .get_unique_id = sd_get_unique_id, 3938 .free_disk = scsi_disk_free_disk, 3939 .pr_ops = &sd_pr_ops, 3940 }; 3941 3942 /** 3943 * sd_format_disk_name - format disk name 3944 * @prefix: name prefix - ie. "sd" for SCSI disks 3945 * @index: index of the disk to format name for 3946 * @buf: output buffer 3947 * @buflen: length of the output buffer 3948 * 3949 * SCSI disk names starts at sda. The 26th device is sdz and the 3950 * 27th is sdaa. The last one for two lettered suffix is sdzz 3951 * which is followed by sdaaa. 3952 * 3953 * This is basically 26 base counting with one extra 'nil' entry 3954 * at the beginning from the second digit on and can be 3955 * determined using similar method as 26 base conversion with the 3956 * index shifted -1 after each digit is computed. 3957 * 3958 * CONTEXT: 3959 * Don't care. 3960 * 3961 * RETURNS: 3962 * 0 on success, -errno on failure. 3963 */ 3964 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 3965 { 3966 const int base = 'z' - 'a' + 1; 3967 char *begin = buf + strlen(prefix); 3968 char *end = buf + buflen; 3969 char *p; 3970 int unit; 3971 3972 p = end - 1; 3973 *p = '\0'; 3974 unit = base; 3975 do { 3976 if (p == begin) 3977 return -EINVAL; 3978 *--p = 'a' + (index % unit); 3979 index = (index / unit) - 1; 3980 } while (index >= 0); 3981 3982 memmove(begin, p, end - p); 3983 memcpy(buf, prefix, strlen(prefix)); 3984 3985 return 0; 3986 } 3987 3988 /** 3989 * sd_probe - called during driver initialization and whenever a 3990 * new scsi device is attached to the system. It is called once 3991 * for each scsi device (not just disks) present. 3992 * @sdp: pointer to device object 3993 * 3994 * Returns 0 if successful (or not interested in this scsi device 3995 * (e.g. scanner)); 1 when there is an error. 3996 * 3997 * Note: this function is invoked from the scsi mid-level. 3998 * This function sets up the mapping between a given 3999 * <host,channel,id,lun> (found in sdp) and new device name 4000 * (e.g. /dev/sda). More precisely it is the block device major 4001 * and minor number that is chosen here. 4002 * 4003 * Assume sd_probe is not re-entrant (for time being) 4004 * Also think about sd_probe() and sd_remove() running coincidentally. 4005 **/ 4006 static int sd_probe(struct scsi_device *sdp) 4007 { 4008 struct device *dev = &sdp->sdev_gendev; 4009 struct scsi_disk *sdkp; 4010 struct gendisk *gd; 4011 int index; 4012 int error; 4013 4014 scsi_autopm_get_device(sdp); 4015 error = -ENODEV; 4016 if (sdp->type != TYPE_DISK && 4017 sdp->type != TYPE_ZBC && 4018 sdp->type != TYPE_MOD && 4019 sdp->type != TYPE_RBC) 4020 goto out; 4021 4022 if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) && sdp->type == TYPE_ZBC) { 4023 sdev_printk(KERN_WARNING, sdp, 4024 "Unsupported ZBC host-managed device.\n"); 4025 goto out; 4026 } 4027 4028 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 4029 "sd_probe\n")); 4030 4031 error = -ENOMEM; 4032 sdkp = kzalloc_obj(*sdkp); 4033 if (!sdkp) 4034 goto out; 4035 4036 gd = blk_mq_alloc_disk_for_queue(sdp->request_queue, 4037 &sd_bio_compl_lkclass); 4038 if (!gd) 4039 goto out_free; 4040 4041 index = ida_alloc(&sd_index_ida, GFP_KERNEL); 4042 if (index < 0) { 4043 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); 4044 goto out_put; 4045 } 4046 4047 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 4048 if (error) { 4049 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); 4050 goto out_free_index; 4051 } 4052 4053 sdkp->device = sdp; 4054 sdkp->disk = gd; 4055 sdkp->index = index; 4056 sdkp->max_retries = SD_MAX_RETRIES; 4057 atomic_set(&sdkp->openers, 0); 4058 atomic_set(&sdkp->device->ioerr_cnt, 0); 4059 4060 if (!sdp->request_queue->rq_timeout) { 4061 if (sdp->type != TYPE_MOD) 4062 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 4063 else 4064 blk_queue_rq_timeout(sdp->request_queue, 4065 SD_MOD_TIMEOUT); 4066 } 4067 4068 device_initialize(&sdkp->disk_dev); 4069 sdkp->disk_dev.parent = get_device(dev); 4070 sdkp->disk_dev.class = &sd_disk_class; 4071 dev_set_name(&sdkp->disk_dev, "%s", dev_name(dev)); 4072 4073 error = device_add(&sdkp->disk_dev); 4074 if (error) { 4075 put_device(&sdkp->disk_dev); 4076 put_disk(gd); 4077 goto out; 4078 } 4079 4080 dev_set_drvdata(dev, sdkp); 4081 4082 gd->major = sd_major((index & 0xf0) >> 4); 4083 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 4084 gd->minors = SD_MINORS; 4085 4086 gd->fops = &sd_fops; 4087 gd->private_data = sdkp; 4088 4089 /* defaults, until the device tells us otherwise */ 4090 sdp->sector_size = 512; 4091 sdkp->capacity = 0; 4092 sdkp->media_present = 1; 4093 sdkp->write_prot = 0; 4094 sdkp->cache_override = 0; 4095 sdkp->WCE = 0; 4096 sdkp->RCD = 0; 4097 sdkp->ATO = 0; 4098 sdkp->first_scan = 1; 4099 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; 4100 4101 sd_revalidate_disk(gd); 4102 if (sdp->sector_size > PAGE_SIZE) { 4103 if (sd_large_pool_create()) { 4104 error = -ENOMEM; 4105 device_unregister(&sdkp->disk_dev); 4106 put_disk(gd); 4107 goto out; 4108 } 4109 } 4110 4111 if (sdp->removable) { 4112 gd->flags |= GENHD_FL_REMOVABLE; 4113 gd->events |= DISK_EVENT_MEDIA_CHANGE; 4114 gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; 4115 } 4116 4117 blk_pm_runtime_init(sdp->request_queue, dev); 4118 if (sdp->rpm_autosuspend) { 4119 pm_runtime_set_autosuspend_delay(dev, 4120 sdp->host->rpm_autosuspend_delay); 4121 } 4122 4123 error = device_add_disk(dev, gd, NULL); 4124 if (error) { 4125 device_unregister(&sdkp->disk_dev); 4126 put_disk(gd); 4127 if (sdp->sector_size > PAGE_SIZE) 4128 sd_large_pool_destroy(); 4129 goto out; 4130 } 4131 4132 if (sdkp->security) { 4133 sdkp->opal_dev = init_opal_dev(sdkp, &sd_sec_submit); 4134 if (sdkp->opal_dev) 4135 sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n"); 4136 } 4137 4138 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 4139 sdp->removable ? "removable " : ""); 4140 scsi_autopm_put_device(sdp); 4141 4142 return 0; 4143 4144 out_free_index: 4145 ida_free(&sd_index_ida, index); 4146 out_put: 4147 put_disk(gd); 4148 out_free: 4149 kfree(sdkp); 4150 out: 4151 scsi_autopm_put_device(sdp); 4152 return error; 4153 } 4154 4155 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 4156 { 4157 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 4158 struct scsi_sense_hdr sshdr; 4159 struct scsi_failure failure_defs[] = { 4160 { 4161 /* Power on, reset, or bus device reset occurred */ 4162 .sense = UNIT_ATTENTION, 4163 .asc = 0x29, 4164 .ascq = 0, 4165 .result = SAM_STAT_CHECK_CONDITION, 4166 }, 4167 { 4168 /* Power on occurred */ 4169 .sense = UNIT_ATTENTION, 4170 .asc = 0x29, 4171 .ascq = 1, 4172 .result = SAM_STAT_CHECK_CONDITION, 4173 }, 4174 { 4175 /* SCSI bus reset */ 4176 .sense = UNIT_ATTENTION, 4177 .asc = 0x29, 4178 .ascq = 2, 4179 .result = SAM_STAT_CHECK_CONDITION, 4180 }, 4181 {} 4182 }; 4183 struct scsi_failures failures = { 4184 .total_allowed = 3, 4185 .failure_definitions = failure_defs, 4186 }; 4187 const struct scsi_exec_args exec_args = { 4188 .sshdr = &sshdr, 4189 .req_flags = BLK_MQ_REQ_PM, 4190 .failures = &failures, 4191 }; 4192 struct scsi_device *sdp = sdkp->device; 4193 int res; 4194 4195 if (start) 4196 cmd[4] |= 1; /* START */ 4197 4198 if (sdp->start_stop_pwr_cond) 4199 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 4200 4201 if (!scsi_device_online(sdp)) 4202 return -ENODEV; 4203 4204 res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, SD_TIMEOUT, 4205 sdkp->max_retries, &exec_args); 4206 if (res) { 4207 sd_print_result(sdkp, "Start/Stop Unit failed", res); 4208 if (res > 0 && scsi_sense_valid(&sshdr)) { 4209 sd_print_sense_hdr(sdkp, &sshdr); 4210 /* 0x3a is medium not present */ 4211 if (sshdr.asc == 0x3a) 4212 res = 0; 4213 } 4214 } 4215 4216 /* SCSI error codes must not go to the generic layer */ 4217 if (res) 4218 return -EIO; 4219 4220 return 0; 4221 } 4222 4223 /* 4224 * Send a SYNCHRONIZE CACHE instruction down to the device through 4225 * the normal SCSI command structure. Wait for the command to 4226 * complete. 4227 */ 4228 static void sd_shutdown(struct scsi_device *sdp) 4229 { 4230 struct device *dev = &sdp->sdev_gendev; 4231 struct scsi_disk *sdkp = dev_get_drvdata(dev); 4232 4233 if (!sdkp) 4234 return; /* this can happen */ 4235 4236 if (pm_runtime_suspended(dev)) 4237 return; 4238 4239 if (sdkp->WCE && sdkp->media_present) { 4240 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 4241 sd_sync_cache(sdkp); 4242 } 4243 4244 if ((system_state != SYSTEM_RESTART && 4245 sdkp->device->manage_system_start_stop) || 4246 (system_state == SYSTEM_POWER_OFF && 4247 sdkp->device->manage_shutdown) || 4248 (system_state == SYSTEM_RUNNING && 4249 sdkp->device->manage_runtime_start_stop) || 4250 (system_state == SYSTEM_RESTART && 4251 sdkp->device->manage_restart)) { 4252 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 4253 sd_start_stop_device(sdkp, 0); 4254 } 4255 } 4256 4257 /** 4258 * sd_remove - called whenever a scsi disk (previously recognized by 4259 * sd_probe) is detached from the system. It is called (potentially 4260 * multiple times) during sd module unload. 4261 * @sdp: pointer to device object 4262 * 4263 * Note: this function is invoked from the scsi mid-level. 4264 * This function potentially frees up a device name (e.g. /dev/sdc) 4265 * that could be re-used by a subsequent sd_probe(). 4266 * This function is not called when the built-in sd driver is "exit-ed". 4267 **/ 4268 static void sd_remove(struct scsi_device *sdp) 4269 { 4270 struct device *dev = &sdp->sdev_gendev; 4271 struct scsi_disk *sdkp = dev_get_drvdata(dev); 4272 4273 scsi_autopm_get_device(sdkp->device); 4274 4275 device_del(&sdkp->disk_dev); 4276 del_gendisk(sdkp->disk); 4277 if (!sdkp->suspended) 4278 sd_shutdown(sdp); 4279 4280 put_disk(sdkp->disk); 4281 4282 if (sdp->sector_size > PAGE_SIZE) 4283 sd_large_pool_destroy(); 4284 } 4285 4286 static inline bool sd_do_start_stop(struct scsi_device *sdev, bool runtime) 4287 { 4288 return (sdev->manage_system_start_stop && !runtime) || 4289 (sdev->manage_runtime_start_stop && runtime); 4290 } 4291 4292 static int sd_suspend_common(struct device *dev, bool runtime) 4293 { 4294 struct scsi_disk *sdkp = dev_get_drvdata(dev); 4295 int ret = 0; 4296 4297 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */ 4298 return 0; 4299 4300 if (sdkp->WCE && sdkp->media_present) { 4301 if (!sdkp->device->silence_suspend) 4302 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 4303 ret = sd_sync_cache(sdkp); 4304 /* ignore OFFLINE device */ 4305 if (ret == -ENODEV) 4306 return 0; 4307 4308 if (ret) 4309 return ret; 4310 } 4311 4312 if (sd_do_start_stop(sdkp->device, runtime)) { 4313 if (!sdkp->device->silence_suspend) 4314 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 4315 /* an error is not worth aborting a system sleep */ 4316 ret = sd_start_stop_device(sdkp, 0); 4317 if (!runtime) 4318 ret = 0; 4319 } 4320 4321 if (!ret) 4322 sdkp->suspended = true; 4323 4324 return ret; 4325 } 4326 4327 static int sd_suspend_system(struct device *dev) 4328 { 4329 if (pm_runtime_suspended(dev)) 4330 return 0; 4331 4332 return sd_suspend_common(dev, false); 4333 } 4334 4335 static int sd_suspend_runtime(struct device *dev) 4336 { 4337 return sd_suspend_common(dev, true); 4338 } 4339 4340 static int sd_resume(struct device *dev) 4341 { 4342 struct scsi_disk *sdkp = dev_get_drvdata(dev); 4343 4344 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 4345 4346 if (opal_unlock_from_suspend(sdkp->opal_dev)) { 4347 sd_printk(KERN_NOTICE, sdkp, "OPAL unlock failed\n"); 4348 return -EIO; 4349 } 4350 4351 return 0; 4352 } 4353 4354 static int sd_resume_common(struct device *dev, bool runtime) 4355 { 4356 struct scsi_disk *sdkp = dev_get_drvdata(dev); 4357 int ret; 4358 4359 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */ 4360 return 0; 4361 4362 if (!sd_do_start_stop(sdkp->device, runtime)) { 4363 sdkp->suspended = false; 4364 return 0; 4365 } 4366 4367 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 4368 ret = sd_start_stop_device(sdkp, 1); 4369 if (!ret) { 4370 sd_resume(dev); 4371 sdkp->suspended = false; 4372 } 4373 4374 return ret; 4375 } 4376 4377 static int sd_resume_system(struct device *dev) 4378 { 4379 if (pm_runtime_suspended(dev)) { 4380 struct scsi_disk *sdkp = dev_get_drvdata(dev); 4381 struct scsi_device *sdp = sdkp ? sdkp->device : NULL; 4382 4383 if (sdp && sdp->force_runtime_start_on_system_start) 4384 pm_request_resume(dev); 4385 4386 return 0; 4387 } 4388 4389 return sd_resume_common(dev, false); 4390 } 4391 4392 static int sd_resume_runtime(struct device *dev) 4393 { 4394 struct scsi_disk *sdkp = dev_get_drvdata(dev); 4395 struct scsi_device *sdp; 4396 4397 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */ 4398 return 0; 4399 4400 sdp = sdkp->device; 4401 4402 if (sdp->ignore_media_change) { 4403 /* clear the device's sense data */ 4404 static const u8 cmd[10] = { REQUEST_SENSE }; 4405 const struct scsi_exec_args exec_args = { 4406 .req_flags = BLK_MQ_REQ_PM, 4407 }; 4408 4409 if (scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, 4410 sdp->request_queue->rq_timeout, 1, 4411 &exec_args)) 4412 sd_printk(KERN_NOTICE, sdkp, 4413 "Failed to clear sense data\n"); 4414 } 4415 4416 return sd_resume_common(dev, true); 4417 } 4418 4419 static const struct dev_pm_ops sd_pm_ops = { 4420 .suspend = sd_suspend_system, 4421 .resume = sd_resume_system, 4422 .poweroff = sd_suspend_system, 4423 .restore = sd_resume_system, 4424 .runtime_suspend = sd_suspend_runtime, 4425 .runtime_resume = sd_resume_runtime, 4426 }; 4427 4428 static struct scsi_driver sd_template = { 4429 .probe = sd_probe, 4430 .remove = sd_remove, 4431 .shutdown = sd_shutdown, 4432 .gendrv = { 4433 .name = "sd", 4434 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 4435 .pm = &sd_pm_ops, 4436 }, 4437 .rescan = sd_rescan, 4438 .resume = sd_resume, 4439 .init_command = sd_init_command, 4440 .uninit_command = sd_uninit_command, 4441 .done = sd_done, 4442 .eh_action = sd_eh_action, 4443 .eh_reset = sd_eh_reset, 4444 }; 4445 4446 /** 4447 * init_sd - entry point for this driver (both when built in or when 4448 * a module). 4449 * 4450 * Note: this function registers this driver with the scsi mid-level. 4451 **/ 4452 static int __init init_sd(void) 4453 { 4454 int majors = 0, i, err; 4455 4456 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 4457 4458 for (i = 0; i < SD_MAJORS; i++) { 4459 if (__register_blkdev(sd_major(i), "sd", sd_default_probe)) 4460 continue; 4461 majors++; 4462 } 4463 4464 if (!majors) 4465 return -ENODEV; 4466 4467 err = class_register(&sd_disk_class); 4468 if (err) 4469 goto err_out; 4470 4471 sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0); 4472 if (!sd_page_pool) { 4473 printk(KERN_ERR "sd: can't init discard page pool\n"); 4474 err = -ENOMEM; 4475 goto err_out_class; 4476 } 4477 4478 err = scsi_register_driver(&sd_template); 4479 if (err) 4480 goto err_out_driver; 4481 4482 return 0; 4483 4484 err_out_driver: 4485 mempool_destroy(sd_page_pool); 4486 err_out_class: 4487 class_unregister(&sd_disk_class); 4488 err_out: 4489 for (i = 0; i < SD_MAJORS; i++) 4490 unregister_blkdev(sd_major(i), "sd"); 4491 return err; 4492 } 4493 4494 /** 4495 * exit_sd - exit point for this driver (when it is a module). 4496 * 4497 * Note: this function unregisters this driver from the scsi mid-level. 4498 **/ 4499 static void __exit exit_sd(void) 4500 { 4501 int i; 4502 4503 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 4504 4505 scsi_unregister_driver(&sd_template); 4506 mempool_destroy(sd_page_pool); 4507 if (sd_large_page_pool) 4508 mempool_destroy(sd_large_page_pool); 4509 4510 class_unregister(&sd_disk_class); 4511 4512 for (i = 0; i < SD_MAJORS; i++) 4513 unregister_blkdev(sd_major(i), "sd"); 4514 } 4515 4516 module_init(init_sd); 4517 module_exit(exit_sd); 4518 4519 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr) 4520 { 4521 scsi_print_sense_hdr(sdkp->device, 4522 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr); 4523 } 4524 4525 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result) 4526 { 4527 const char *hb_string = scsi_hostbyte_string(result); 4528 4529 if (hb_string) 4530 sd_printk(KERN_INFO, sdkp, 4531 "%s: Result: hostbyte=%s driverbyte=%s\n", msg, 4532 hb_string ? hb_string : "invalid", 4533 "DRIVER_OK"); 4534 else 4535 sd_printk(KERN_INFO, sdkp, 4536 "%s: Result: hostbyte=0x%02x driverbyte=%s\n", 4537 msg, host_byte(result), "DRIVER_OK"); 4538 } 4539