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