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