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