1 /* 2 * sd.c Copyright (C) 1992 Drew Eckhardt 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * Linux scsi disk driver 6 * Initial versions: Drew Eckhardt 7 * Subsequent revisions: Eric Youngdale 8 * Modification history: 9 * - Drew Eckhardt <drew@colorado.edu> original 10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 11 * outstanding request, and other enhancements. 12 * Support loadable low-level scsi drivers. 13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 14 * eight major numbers. 15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. 16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 17 * sd_init and cleanups. 18 * - Alex Davis <letmein@erols.com> Fix problem where partition info 19 * not being read in sd_open. Fix problem where removable media 20 * could be ejected after sd_open. 21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x 22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 24 * Support 32k/1M disks. 25 * 26 * Logging policy (needs CONFIG_SCSI_LOGGING defined): 27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 30 * - entering other commands: SCSI_LOG_HLQUEUE level 3 31 * Note: when the logging level is set by the user, it must be greater 32 * than the level indicated above to trigger output. 33 */ 34 35 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/genhd.h> 41 #include <linux/hdreg.h> 42 #include <linux/errno.h> 43 #include <linux/idr.h> 44 #include <linux/interrupt.h> 45 #include <linux/init.h> 46 #include <linux/blkdev.h> 47 #include <linux/blkpg.h> 48 #include <linux/delay.h> 49 #include <linux/mutex.h> 50 #include <linux/string_helpers.h> 51 #include <linux/async.h> 52 #include <linux/slab.h> 53 #include <linux/sed-opal.h> 54 #include <linux/pm_runtime.h> 55 #include <linux/pr.h> 56 #include <linux/t10-pi.h> 57 #include <linux/uaccess.h> 58 #include <asm/unaligned.h> 59 60 #include <scsi/scsi.h> 61 #include <scsi/scsi_cmnd.h> 62 #include <scsi/scsi_dbg.h> 63 #include <scsi/scsi_device.h> 64 #include <scsi/scsi_driver.h> 65 #include <scsi/scsi_eh.h> 66 #include <scsi/scsi_host.h> 67 #include <scsi/scsi_ioctl.h> 68 #include <scsi/scsicam.h> 69 70 #include "sd.h" 71 #include "scsi_priv.h" 72 #include "scsi_logging.h" 73 74 MODULE_AUTHOR("Eric Youngdale"); 75 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 76 MODULE_LICENSE("GPL"); 77 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 93 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 94 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 95 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 96 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 97 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC); 98 99 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 100 #define SD_MINORS 16 101 #else 102 #define SD_MINORS 0 103 #endif 104 105 static void sd_config_discard(struct scsi_disk *, unsigned int); 106 static void sd_config_write_same(struct scsi_disk *); 107 static int sd_revalidate_disk(struct gendisk *); 108 static void sd_unlock_native_capacity(struct gendisk *disk); 109 static int sd_probe(struct device *); 110 static int sd_remove(struct device *); 111 static void sd_shutdown(struct device *); 112 static int sd_suspend_system(struct device *); 113 static int sd_suspend_runtime(struct device *); 114 static int sd_resume(struct device *); 115 static void sd_rescan(struct device *); 116 static int sd_init_command(struct scsi_cmnd *SCpnt); 117 static void sd_uninit_command(struct scsi_cmnd *SCpnt); 118 static int sd_done(struct scsi_cmnd *); 119 static void sd_eh_reset(struct scsi_cmnd *); 120 static int sd_eh_action(struct scsi_cmnd *, int); 121 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 122 static void scsi_disk_release(struct device *cdev); 123 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 124 static void sd_print_result(const struct scsi_disk *, const char *, int); 125 126 static DEFINE_IDA(sd_index_ida); 127 128 /* This semaphore is used to mediate the 0->1 reference get in the 129 * face of object destruction (i.e. we can't allow a get on an 130 * object after last put) */ 131 static DEFINE_MUTEX(sd_ref_mutex); 132 133 static struct kmem_cache *sd_cdb_cache; 134 static mempool_t *sd_cdb_pool; 135 136 static const char *sd_cache_types[] = { 137 "write through", "none", "write back", 138 "write back, no read (daft)" 139 }; 140 141 static void sd_set_flush_flag(struct scsi_disk *sdkp) 142 { 143 bool wc = false, fua = false; 144 145 if (sdkp->WCE) { 146 wc = true; 147 if (sdkp->DPOFUA) 148 fua = true; 149 } 150 151 blk_queue_write_cache(sdkp->disk->queue, wc, fua); 152 } 153 154 static ssize_t 155 cache_type_store(struct device *dev, struct device_attribute *attr, 156 const char *buf, size_t count) 157 { 158 int ct, rcd, wce, sp; 159 struct scsi_disk *sdkp = to_scsi_disk(dev); 160 struct scsi_device *sdp = sdkp->device; 161 char buffer[64]; 162 char *buffer_data; 163 struct scsi_mode_data data; 164 struct scsi_sense_hdr sshdr; 165 static const char temp[] = "temporary "; 166 int len; 167 168 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 169 /* no cache control on RBC devices; theoretically they 170 * can do it, but there's probably so many exceptions 171 * it's not worth the risk */ 172 return -EINVAL; 173 174 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { 175 buf += sizeof(temp) - 1; 176 sdkp->cache_override = 1; 177 } else { 178 sdkp->cache_override = 0; 179 } 180 181 ct = sysfs_match_string(sd_cache_types, buf); 182 if (ct < 0) 183 return -EINVAL; 184 185 rcd = ct & 0x01 ? 1 : 0; 186 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0; 187 188 if (sdkp->cache_override) { 189 sdkp->WCE = wce; 190 sdkp->RCD = rcd; 191 sd_set_flush_flag(sdkp); 192 return count; 193 } 194 195 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 196 SD_MAX_RETRIES, &data, NULL)) 197 return -EINVAL; 198 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 199 data.block_descriptor_length); 200 buffer_data = buffer + data.header_length + 201 data.block_descriptor_length; 202 buffer_data[2] &= ~0x05; 203 buffer_data[2] |= wce << 2 | rcd; 204 sp = buffer_data[0] & 0x80 ? 1 : 0; 205 buffer_data[0] &= ~0x80; 206 207 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 208 SD_MAX_RETRIES, &data, &sshdr)) { 209 if (scsi_sense_valid(&sshdr)) 210 sd_print_sense_hdr(sdkp, &sshdr); 211 return -EINVAL; 212 } 213 revalidate_disk(sdkp->disk); 214 return count; 215 } 216 217 static ssize_t 218 manage_start_stop_show(struct device *dev, struct device_attribute *attr, 219 char *buf) 220 { 221 struct scsi_disk *sdkp = to_scsi_disk(dev); 222 struct scsi_device *sdp = sdkp->device; 223 224 return sprintf(buf, "%u\n", sdp->manage_start_stop); 225 } 226 227 static ssize_t 228 manage_start_stop_store(struct device *dev, struct device_attribute *attr, 229 const char *buf, size_t count) 230 { 231 struct scsi_disk *sdkp = to_scsi_disk(dev); 232 struct scsi_device *sdp = sdkp->device; 233 bool v; 234 235 if (!capable(CAP_SYS_ADMIN)) 236 return -EACCES; 237 238 if (kstrtobool(buf, &v)) 239 return -EINVAL; 240 241 sdp->manage_start_stop = v; 242 243 return count; 244 } 245 static DEVICE_ATTR_RW(manage_start_stop); 246 247 static ssize_t 248 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf) 249 { 250 struct scsi_disk *sdkp = to_scsi_disk(dev); 251 252 return sprintf(buf, "%u\n", sdkp->device->allow_restart); 253 } 254 255 static ssize_t 256 allow_restart_store(struct device *dev, struct device_attribute *attr, 257 const char *buf, size_t count) 258 { 259 bool v; 260 struct scsi_disk *sdkp = to_scsi_disk(dev); 261 struct scsi_device *sdp = sdkp->device; 262 263 if (!capable(CAP_SYS_ADMIN)) 264 return -EACCES; 265 266 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 267 return -EINVAL; 268 269 if (kstrtobool(buf, &v)) 270 return -EINVAL; 271 272 sdp->allow_restart = v; 273 274 return count; 275 } 276 static DEVICE_ATTR_RW(allow_restart); 277 278 static ssize_t 279 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) 280 { 281 struct scsi_disk *sdkp = to_scsi_disk(dev); 282 int ct = sdkp->RCD + 2*sdkp->WCE; 283 284 return sprintf(buf, "%s\n", sd_cache_types[ct]); 285 } 286 static DEVICE_ATTR_RW(cache_type); 287 288 static ssize_t 289 FUA_show(struct device *dev, struct device_attribute *attr, char *buf) 290 { 291 struct scsi_disk *sdkp = to_scsi_disk(dev); 292 293 return sprintf(buf, "%u\n", sdkp->DPOFUA); 294 } 295 static DEVICE_ATTR_RO(FUA); 296 297 static ssize_t 298 protection_type_show(struct device *dev, struct device_attribute *attr, 299 char *buf) 300 { 301 struct scsi_disk *sdkp = to_scsi_disk(dev); 302 303 return sprintf(buf, "%u\n", sdkp->protection_type); 304 } 305 306 static ssize_t 307 protection_type_store(struct device *dev, struct device_attribute *attr, 308 const char *buf, size_t count) 309 { 310 struct scsi_disk *sdkp = to_scsi_disk(dev); 311 unsigned int val; 312 int err; 313 314 if (!capable(CAP_SYS_ADMIN)) 315 return -EACCES; 316 317 err = kstrtouint(buf, 10, &val); 318 319 if (err) 320 return err; 321 322 if (val <= T10_PI_TYPE3_PROTECTION) 323 sdkp->protection_type = val; 324 325 return count; 326 } 327 static DEVICE_ATTR_RW(protection_type); 328 329 static ssize_t 330 protection_mode_show(struct device *dev, struct device_attribute *attr, 331 char *buf) 332 { 333 struct scsi_disk *sdkp = to_scsi_disk(dev); 334 struct scsi_device *sdp = sdkp->device; 335 unsigned int dif, dix; 336 337 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 338 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); 339 340 if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) { 341 dif = 0; 342 dix = 1; 343 } 344 345 if (!dif && !dix) 346 return sprintf(buf, "none\n"); 347 348 return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif); 349 } 350 static DEVICE_ATTR_RO(protection_mode); 351 352 static ssize_t 353 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf) 354 { 355 struct scsi_disk *sdkp = to_scsi_disk(dev); 356 357 return sprintf(buf, "%u\n", sdkp->ATO); 358 } 359 static DEVICE_ATTR_RO(app_tag_own); 360 361 static ssize_t 362 thin_provisioning_show(struct device *dev, struct device_attribute *attr, 363 char *buf) 364 { 365 struct scsi_disk *sdkp = to_scsi_disk(dev); 366 367 return sprintf(buf, "%u\n", sdkp->lbpme); 368 } 369 static DEVICE_ATTR_RO(thin_provisioning); 370 371 /* sysfs_match_string() requires dense arrays */ 372 static const char *lbp_mode[] = { 373 [SD_LBP_FULL] = "full", 374 [SD_LBP_UNMAP] = "unmap", 375 [SD_LBP_WS16] = "writesame_16", 376 [SD_LBP_WS10] = "writesame_10", 377 [SD_LBP_ZERO] = "writesame_zero", 378 [SD_LBP_DISABLE] = "disabled", 379 }; 380 381 static ssize_t 382 provisioning_mode_show(struct device *dev, struct device_attribute *attr, 383 char *buf) 384 { 385 struct scsi_disk *sdkp = to_scsi_disk(dev); 386 387 return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]); 388 } 389 390 static ssize_t 391 provisioning_mode_store(struct device *dev, struct device_attribute *attr, 392 const char *buf, size_t count) 393 { 394 struct scsi_disk *sdkp = to_scsi_disk(dev); 395 struct scsi_device *sdp = sdkp->device; 396 int mode; 397 398 if (!capable(CAP_SYS_ADMIN)) 399 return -EACCES; 400 401 if (sd_is_zoned(sdkp)) { 402 sd_config_discard(sdkp, SD_LBP_DISABLE); 403 return count; 404 } 405 406 if (sdp->type != TYPE_DISK) 407 return -EINVAL; 408 409 mode = sysfs_match_string(lbp_mode, buf); 410 if (mode < 0) 411 return -EINVAL; 412 413 sd_config_discard(sdkp, mode); 414 415 return count; 416 } 417 static DEVICE_ATTR_RW(provisioning_mode); 418 419 /* sysfs_match_string() requires dense arrays */ 420 static const char *zeroing_mode[] = { 421 [SD_ZERO_WRITE] = "write", 422 [SD_ZERO_WS] = "writesame", 423 [SD_ZERO_WS16_UNMAP] = "writesame_16_unmap", 424 [SD_ZERO_WS10_UNMAP] = "writesame_10_unmap", 425 }; 426 427 static ssize_t 428 zeroing_mode_show(struct device *dev, struct device_attribute *attr, 429 char *buf) 430 { 431 struct scsi_disk *sdkp = to_scsi_disk(dev); 432 433 return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]); 434 } 435 436 static ssize_t 437 zeroing_mode_store(struct device *dev, struct device_attribute *attr, 438 const char *buf, size_t count) 439 { 440 struct scsi_disk *sdkp = to_scsi_disk(dev); 441 int mode; 442 443 if (!capable(CAP_SYS_ADMIN)) 444 return -EACCES; 445 446 mode = sysfs_match_string(zeroing_mode, buf); 447 if (mode < 0) 448 return -EINVAL; 449 450 sdkp->zeroing_mode = mode; 451 452 return count; 453 } 454 static DEVICE_ATTR_RW(zeroing_mode); 455 456 static ssize_t 457 max_medium_access_timeouts_show(struct device *dev, 458 struct device_attribute *attr, char *buf) 459 { 460 struct scsi_disk *sdkp = to_scsi_disk(dev); 461 462 return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts); 463 } 464 465 static ssize_t 466 max_medium_access_timeouts_store(struct device *dev, 467 struct device_attribute *attr, const char *buf, 468 size_t count) 469 { 470 struct scsi_disk *sdkp = to_scsi_disk(dev); 471 int err; 472 473 if (!capable(CAP_SYS_ADMIN)) 474 return -EACCES; 475 476 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); 477 478 return err ? err : count; 479 } 480 static DEVICE_ATTR_RW(max_medium_access_timeouts); 481 482 static ssize_t 483 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr, 484 char *buf) 485 { 486 struct scsi_disk *sdkp = to_scsi_disk(dev); 487 488 return sprintf(buf, "%u\n", sdkp->max_ws_blocks); 489 } 490 491 static ssize_t 492 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr, 493 const char *buf, size_t count) 494 { 495 struct scsi_disk *sdkp = to_scsi_disk(dev); 496 struct scsi_device *sdp = sdkp->device; 497 unsigned long max; 498 int err; 499 500 if (!capable(CAP_SYS_ADMIN)) 501 return -EACCES; 502 503 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 504 return -EINVAL; 505 506 err = kstrtoul(buf, 10, &max); 507 508 if (err) 509 return err; 510 511 if (max == 0) 512 sdp->no_write_same = 1; 513 else if (max <= SD_MAX_WS16_BLOCKS) { 514 sdp->no_write_same = 0; 515 sdkp->max_ws_blocks = max; 516 } 517 518 sd_config_write_same(sdkp); 519 520 return count; 521 } 522 static DEVICE_ATTR_RW(max_write_same_blocks); 523 524 static struct attribute *sd_disk_attrs[] = { 525 &dev_attr_cache_type.attr, 526 &dev_attr_FUA.attr, 527 &dev_attr_allow_restart.attr, 528 &dev_attr_manage_start_stop.attr, 529 &dev_attr_protection_type.attr, 530 &dev_attr_protection_mode.attr, 531 &dev_attr_app_tag_own.attr, 532 &dev_attr_thin_provisioning.attr, 533 &dev_attr_provisioning_mode.attr, 534 &dev_attr_zeroing_mode.attr, 535 &dev_attr_max_write_same_blocks.attr, 536 &dev_attr_max_medium_access_timeouts.attr, 537 NULL, 538 }; 539 ATTRIBUTE_GROUPS(sd_disk); 540 541 static struct class sd_disk_class = { 542 .name = "scsi_disk", 543 .owner = THIS_MODULE, 544 .dev_release = scsi_disk_release, 545 .dev_groups = sd_disk_groups, 546 }; 547 548 static const struct dev_pm_ops sd_pm_ops = { 549 .suspend = sd_suspend_system, 550 .resume = sd_resume, 551 .poweroff = sd_suspend_system, 552 .restore = sd_resume, 553 .runtime_suspend = sd_suspend_runtime, 554 .runtime_resume = sd_resume, 555 }; 556 557 static struct scsi_driver sd_template = { 558 .gendrv = { 559 .name = "sd", 560 .owner = THIS_MODULE, 561 .probe = sd_probe, 562 .remove = sd_remove, 563 .shutdown = sd_shutdown, 564 .pm = &sd_pm_ops, 565 }, 566 .rescan = sd_rescan, 567 .init_command = sd_init_command, 568 .uninit_command = sd_uninit_command, 569 .done = sd_done, 570 .eh_action = sd_eh_action, 571 .eh_reset = sd_eh_reset, 572 }; 573 574 /* 575 * Dummy kobj_map->probe function. 576 * The default ->probe function will call modprobe, which is 577 * pointless as this module is already loaded. 578 */ 579 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data) 580 { 581 return NULL; 582 } 583 584 /* 585 * Device no to disk mapping: 586 * 587 * major disc2 disc p1 588 * |............|.............|....|....| <- dev_t 589 * 31 20 19 8 7 4 3 0 590 * 591 * Inside a major, we have 16k disks, however mapped non- 592 * contiguously. The first 16 disks are for major0, the next 593 * ones with major1, ... Disk 256 is for major0 again, disk 272 594 * for major1, ... 595 * As we stay compatible with our numbering scheme, we can reuse 596 * the well-know SCSI majors 8, 65--71, 136--143. 597 */ 598 static int sd_major(int major_idx) 599 { 600 switch (major_idx) { 601 case 0: 602 return SCSI_DISK0_MAJOR; 603 case 1 ... 7: 604 return SCSI_DISK1_MAJOR + major_idx - 1; 605 case 8 ... 15: 606 return SCSI_DISK8_MAJOR + major_idx - 8; 607 default: 608 BUG(); 609 return 0; /* shut up gcc */ 610 } 611 } 612 613 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 614 { 615 struct scsi_disk *sdkp = NULL; 616 617 mutex_lock(&sd_ref_mutex); 618 619 if (disk->private_data) { 620 sdkp = scsi_disk(disk); 621 if (scsi_device_get(sdkp->device) == 0) 622 get_device(&sdkp->dev); 623 else 624 sdkp = NULL; 625 } 626 mutex_unlock(&sd_ref_mutex); 627 return sdkp; 628 } 629 630 static void scsi_disk_put(struct scsi_disk *sdkp) 631 { 632 struct scsi_device *sdev = sdkp->device; 633 634 mutex_lock(&sd_ref_mutex); 635 put_device(&sdkp->dev); 636 scsi_device_put(sdev); 637 mutex_unlock(&sd_ref_mutex); 638 } 639 640 #ifdef CONFIG_BLK_SED_OPAL 641 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, 642 size_t len, bool send) 643 { 644 struct scsi_device *sdev = data; 645 u8 cdb[12] = { 0, }; 646 int ret; 647 648 cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN; 649 cdb[1] = secp; 650 put_unaligned_be16(spsp, &cdb[2]); 651 put_unaligned_be32(len, &cdb[6]); 652 653 ret = scsi_execute_req(sdev, cdb, 654 send ? DMA_TO_DEVICE : DMA_FROM_DEVICE, 655 buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL); 656 return ret <= 0 ? ret : -EIO; 657 } 658 #endif /* CONFIG_BLK_SED_OPAL */ 659 660 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd, 661 unsigned int dix, unsigned int dif) 662 { 663 struct bio *bio = scmd->request->bio; 664 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif); 665 unsigned int protect = 0; 666 667 if (dix) { /* DIX Type 0, 1, 2, 3 */ 668 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM)) 669 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM; 670 671 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 672 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK; 673 } 674 675 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */ 676 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT; 677 678 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 679 scmd->prot_flags |= SCSI_PROT_REF_CHECK; 680 } 681 682 if (dif) { /* DIX/DIF Type 1, 2, 3 */ 683 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI; 684 685 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK)) 686 protect = 3 << 5; /* Disable target PI checking */ 687 else 688 protect = 1 << 5; /* Enable target PI checking */ 689 } 690 691 scsi_set_prot_op(scmd, prot_op); 692 scsi_set_prot_type(scmd, dif); 693 scmd->prot_flags &= sd_prot_flag_mask(prot_op); 694 695 return protect; 696 } 697 698 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) 699 { 700 struct request_queue *q = sdkp->disk->queue; 701 unsigned int logical_block_size = sdkp->device->sector_size; 702 unsigned int max_blocks = 0; 703 704 q->limits.discard_alignment = 705 sdkp->unmap_alignment * logical_block_size; 706 q->limits.discard_granularity = 707 max(sdkp->physical_block_size, 708 sdkp->unmap_granularity * logical_block_size); 709 sdkp->provisioning_mode = mode; 710 711 switch (mode) { 712 713 case SD_LBP_FULL: 714 case SD_LBP_DISABLE: 715 blk_queue_max_discard_sectors(q, 0); 716 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q); 717 return; 718 719 case SD_LBP_UNMAP: 720 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 721 (u32)SD_MAX_WS16_BLOCKS); 722 break; 723 724 case SD_LBP_WS16: 725 if (sdkp->device->unmap_limit_for_ws) 726 max_blocks = sdkp->max_unmap_blocks; 727 else 728 max_blocks = sdkp->max_ws_blocks; 729 730 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS); 731 break; 732 733 case SD_LBP_WS10: 734 if (sdkp->device->unmap_limit_for_ws) 735 max_blocks = sdkp->max_unmap_blocks; 736 else 737 max_blocks = sdkp->max_ws_blocks; 738 739 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS); 740 break; 741 742 case SD_LBP_ZERO: 743 max_blocks = min_not_zero(sdkp->max_ws_blocks, 744 (u32)SD_MAX_WS10_BLOCKS); 745 break; 746 } 747 748 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9)); 749 blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); 750 } 751 752 static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd) 753 { 754 struct scsi_device *sdp = cmd->device; 755 struct request *rq = cmd->request; 756 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); 757 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); 758 unsigned int data_len = 24; 759 char *buf; 760 761 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 762 if (!rq->special_vec.bv_page) 763 return BLKPREP_DEFER; 764 rq->special_vec.bv_offset = 0; 765 rq->special_vec.bv_len = data_len; 766 rq->rq_flags |= RQF_SPECIAL_PAYLOAD; 767 768 cmd->cmd_len = 10; 769 cmd->cmnd[0] = UNMAP; 770 cmd->cmnd[8] = 24; 771 772 buf = page_address(rq->special_vec.bv_page); 773 put_unaligned_be16(6 + 16, &buf[0]); 774 put_unaligned_be16(16, &buf[2]); 775 put_unaligned_be64(sector, &buf[8]); 776 put_unaligned_be32(nr_sectors, &buf[16]); 777 778 cmd->allowed = SD_MAX_RETRIES; 779 cmd->transfersize = data_len; 780 rq->timeout = SD_TIMEOUT; 781 scsi_req(rq)->resid_len = data_len; 782 783 return scsi_init_io(cmd); 784 } 785 786 static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap) 787 { 788 struct scsi_device *sdp = cmd->device; 789 struct request *rq = cmd->request; 790 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); 791 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); 792 u32 data_len = sdp->sector_size; 793 794 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 795 if (!rq->special_vec.bv_page) 796 return BLKPREP_DEFER; 797 rq->special_vec.bv_offset = 0; 798 rq->special_vec.bv_len = data_len; 799 rq->rq_flags |= RQF_SPECIAL_PAYLOAD; 800 801 cmd->cmd_len = 16; 802 cmd->cmnd[0] = WRITE_SAME_16; 803 if (unmap) 804 cmd->cmnd[1] = 0x8; /* UNMAP */ 805 put_unaligned_be64(sector, &cmd->cmnd[2]); 806 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); 807 808 cmd->allowed = SD_MAX_RETRIES; 809 cmd->transfersize = data_len; 810 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT; 811 scsi_req(rq)->resid_len = data_len; 812 813 return scsi_init_io(cmd); 814 } 815 816 static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap) 817 { 818 struct scsi_device *sdp = cmd->device; 819 struct request *rq = cmd->request; 820 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); 821 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); 822 u32 data_len = sdp->sector_size; 823 824 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 825 if (!rq->special_vec.bv_page) 826 return BLKPREP_DEFER; 827 rq->special_vec.bv_offset = 0; 828 rq->special_vec.bv_len = data_len; 829 rq->rq_flags |= RQF_SPECIAL_PAYLOAD; 830 831 cmd->cmd_len = 10; 832 cmd->cmnd[0] = WRITE_SAME; 833 if (unmap) 834 cmd->cmnd[1] = 0x8; /* UNMAP */ 835 put_unaligned_be32(sector, &cmd->cmnd[2]); 836 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); 837 838 cmd->allowed = SD_MAX_RETRIES; 839 cmd->transfersize = data_len; 840 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT; 841 scsi_req(rq)->resid_len = data_len; 842 843 return scsi_init_io(cmd); 844 } 845 846 static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd) 847 { 848 struct request *rq = cmd->request; 849 struct scsi_device *sdp = cmd->device; 850 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 851 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); 852 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); 853 854 if (!(rq->cmd_flags & REQ_NOUNMAP)) { 855 switch (sdkp->zeroing_mode) { 856 case SD_ZERO_WS16_UNMAP: 857 return sd_setup_write_same16_cmnd(cmd, true); 858 case SD_ZERO_WS10_UNMAP: 859 return sd_setup_write_same10_cmnd(cmd, true); 860 } 861 } 862 863 if (sdp->no_write_same) 864 return BLKPREP_INVALID; 865 866 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) 867 return sd_setup_write_same16_cmnd(cmd, false); 868 869 return sd_setup_write_same10_cmnd(cmd, false); 870 } 871 872 static void sd_config_write_same(struct scsi_disk *sdkp) 873 { 874 struct request_queue *q = sdkp->disk->queue; 875 unsigned int logical_block_size = sdkp->device->sector_size; 876 877 if (sdkp->device->no_write_same) { 878 sdkp->max_ws_blocks = 0; 879 goto out; 880 } 881 882 /* Some devices can not handle block counts above 0xffff despite 883 * supporting WRITE SAME(16). Consequently we default to 64k 884 * blocks per I/O unless the device explicitly advertises a 885 * bigger limit. 886 */ 887 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) 888 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 889 (u32)SD_MAX_WS16_BLOCKS); 890 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes) 891 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 892 (u32)SD_MAX_WS10_BLOCKS); 893 else { 894 sdkp->device->no_write_same = 1; 895 sdkp->max_ws_blocks = 0; 896 } 897 898 if (sdkp->lbprz && sdkp->lbpws) 899 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP; 900 else if (sdkp->lbprz && sdkp->lbpws10) 901 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP; 902 else if (sdkp->max_ws_blocks) 903 sdkp->zeroing_mode = SD_ZERO_WS; 904 else 905 sdkp->zeroing_mode = SD_ZERO_WRITE; 906 907 if (sdkp->max_ws_blocks && 908 sdkp->physical_block_size > logical_block_size) { 909 /* 910 * Reporting a maximum number of blocks that is not aligned 911 * on the device physical size would cause a large write same 912 * request to be split into physically unaligned chunks by 913 * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same() 914 * even if the caller of these functions took care to align the 915 * large request. So make sure the maximum reported is aligned 916 * to the device physical block size. This is only an optional 917 * optimization for regular disks, but this is mandatory to 918 * avoid failure of large write same requests directed at 919 * sequential write required zones of host-managed ZBC disks. 920 */ 921 sdkp->max_ws_blocks = 922 round_down(sdkp->max_ws_blocks, 923 bytes_to_logical(sdkp->device, 924 sdkp->physical_block_size)); 925 } 926 927 out: 928 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks * 929 (logical_block_size >> 9)); 930 blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks * 931 (logical_block_size >> 9)); 932 } 933 934 /** 935 * sd_setup_write_same_cmnd - write the same data to multiple blocks 936 * @cmd: command to prepare 937 * 938 * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on 939 * the preference indicated by the target device. 940 **/ 941 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd) 942 { 943 struct request *rq = cmd->request; 944 struct scsi_device *sdp = cmd->device; 945 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 946 struct bio *bio = rq->bio; 947 sector_t sector = blk_rq_pos(rq); 948 unsigned int nr_sectors = blk_rq_sectors(rq); 949 unsigned int nr_bytes = blk_rq_bytes(rq); 950 int ret; 951 952 if (sdkp->device->no_write_same) 953 return BLKPREP_INVALID; 954 955 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size); 956 957 sector >>= ilog2(sdp->sector_size) - 9; 958 nr_sectors >>= ilog2(sdp->sector_size) - 9; 959 960 rq->timeout = SD_WRITE_SAME_TIMEOUT; 961 962 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) { 963 cmd->cmd_len = 16; 964 cmd->cmnd[0] = WRITE_SAME_16; 965 put_unaligned_be64(sector, &cmd->cmnd[2]); 966 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); 967 } else { 968 cmd->cmd_len = 10; 969 cmd->cmnd[0] = WRITE_SAME; 970 put_unaligned_be32(sector, &cmd->cmnd[2]); 971 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); 972 } 973 974 cmd->transfersize = sdp->sector_size; 975 cmd->allowed = SD_MAX_RETRIES; 976 977 /* 978 * For WRITE SAME the data transferred via the DATA OUT buffer is 979 * different from the amount of data actually written to the target. 980 * 981 * We set up __data_len to the amount of data transferred via the 982 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list 983 * to transfer a single sector of data first, but then reset it to 984 * the amount of data to be written right after so that the I/O path 985 * knows how much to actually write. 986 */ 987 rq->__data_len = sdp->sector_size; 988 ret = scsi_init_io(cmd); 989 rq->__data_len = nr_bytes; 990 991 return ret; 992 } 993 994 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd) 995 { 996 struct request *rq = cmd->request; 997 998 /* flush requests don't perform I/O, zero the S/G table */ 999 memset(&cmd->sdb, 0, sizeof(cmd->sdb)); 1000 1001 cmd->cmnd[0] = SYNCHRONIZE_CACHE; 1002 cmd->cmd_len = 10; 1003 cmd->transfersize = 0; 1004 cmd->allowed = SD_MAX_RETRIES; 1005 1006 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER; 1007 return BLKPREP_OK; 1008 } 1009 1010 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt) 1011 { 1012 struct request *rq = SCpnt->request; 1013 struct scsi_device *sdp = SCpnt->device; 1014 struct gendisk *disk = rq->rq_disk; 1015 struct scsi_disk *sdkp = scsi_disk(disk); 1016 sector_t block = blk_rq_pos(rq); 1017 sector_t threshold; 1018 unsigned int this_count = blk_rq_sectors(rq); 1019 unsigned int dif, dix; 1020 int ret; 1021 unsigned char protect; 1022 1023 ret = scsi_init_io(SCpnt); 1024 if (ret != BLKPREP_OK) 1025 return ret; 1026 WARN_ON_ONCE(SCpnt != rq->special); 1027 1028 /* from here on until we're complete, any goto out 1029 * is used for a killable error condition */ 1030 ret = BLKPREP_KILL; 1031 1032 SCSI_LOG_HLQUEUE(1, 1033 scmd_printk(KERN_INFO, SCpnt, 1034 "%s: block=%llu, count=%d\n", 1035 __func__, (unsigned long long)block, this_count)); 1036 1037 if (!sdp || !scsi_device_online(sdp) || 1038 block + blk_rq_sectors(rq) > get_capacity(disk)) { 1039 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 1040 "Finishing %u sectors\n", 1041 blk_rq_sectors(rq))); 1042 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 1043 "Retry with 0x%p\n", SCpnt)); 1044 goto out; 1045 } 1046 1047 if (sdp->changed) { 1048 /* 1049 * quietly refuse to do anything to a changed disc until 1050 * the changed bit has been reset 1051 */ 1052 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ 1053 goto out; 1054 } 1055 1056 /* 1057 * Some SD card readers can't handle multi-sector accesses which touch 1058 * the last one or two hardware sectors. Split accesses as needed. 1059 */ 1060 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 1061 (sdp->sector_size / 512); 1062 1063 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 1064 if (block < threshold) { 1065 /* Access up to the threshold but not beyond */ 1066 this_count = threshold - block; 1067 } else { 1068 /* Access only a single hardware sector */ 1069 this_count = sdp->sector_size / 512; 1070 } 1071 } 1072 1073 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 1074 (unsigned long long)block)); 1075 1076 /* 1077 * If we have a 1K hardware sectorsize, prevent access to single 1078 * 512 byte sectors. In theory we could handle this - in fact 1079 * the scsi cdrom driver must be able to handle this because 1080 * we typically use 1K blocksizes, and cdroms typically have 1081 * 2K hardware sectorsizes. Of course, things are simpler 1082 * with the cdrom, since it is read-only. For performance 1083 * reasons, the filesystems should be able to handle this 1084 * and not force the scsi disk driver to use bounce buffers 1085 * for this. 1086 */ 1087 if (sdp->sector_size == 1024) { 1088 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 1089 scmd_printk(KERN_ERR, SCpnt, 1090 "Bad block number requested\n"); 1091 goto out; 1092 } else { 1093 block = block >> 1; 1094 this_count = this_count >> 1; 1095 } 1096 } 1097 if (sdp->sector_size == 2048) { 1098 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 1099 scmd_printk(KERN_ERR, SCpnt, 1100 "Bad block number requested\n"); 1101 goto out; 1102 } else { 1103 block = block >> 2; 1104 this_count = this_count >> 2; 1105 } 1106 } 1107 if (sdp->sector_size == 4096) { 1108 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 1109 scmd_printk(KERN_ERR, SCpnt, 1110 "Bad block number requested\n"); 1111 goto out; 1112 } else { 1113 block = block >> 3; 1114 this_count = this_count >> 3; 1115 } 1116 } 1117 if (rq_data_dir(rq) == WRITE) { 1118 SCpnt->cmnd[0] = WRITE_6; 1119 1120 if (blk_integrity_rq(rq)) 1121 t10_pi_prepare(SCpnt->request, sdkp->protection_type); 1122 1123 } else if (rq_data_dir(rq) == READ) { 1124 SCpnt->cmnd[0] = READ_6; 1125 } else { 1126 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq)); 1127 goto out; 1128 } 1129 1130 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 1131 "%s %d/%u 512 byte blocks.\n", 1132 (rq_data_dir(rq) == WRITE) ? 1133 "writing" : "reading", this_count, 1134 blk_rq_sectors(rq))); 1135 1136 dix = scsi_prot_sg_count(SCpnt); 1137 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type); 1138 1139 if (dif || dix) 1140 protect = sd_setup_protect_cmnd(SCpnt, dix, dif); 1141 else 1142 protect = 0; 1143 1144 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) { 1145 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 1146 1147 if (unlikely(SCpnt->cmnd == NULL)) { 1148 ret = BLKPREP_DEFER; 1149 goto out; 1150 } 1151 1152 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 1153 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 1154 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 1155 SCpnt->cmnd[7] = 0x18; 1156 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 1157 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1158 1159 /* LBA */ 1160 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1161 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1162 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1163 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1164 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 1165 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 1166 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 1167 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 1168 1169 /* Expected Indirect LBA */ 1170 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 1171 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 1172 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 1173 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 1174 1175 /* Transfer length */ 1176 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 1177 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 1178 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 1179 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 1180 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) { 1181 SCpnt->cmnd[0] += READ_16 - READ_6; 1182 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1183 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1184 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1185 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1186 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1187 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 1188 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 1189 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 1190 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 1191 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 1192 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 1193 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 1194 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 1195 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 1196 } else if ((this_count > 0xff) || (block > 0x1fffff) || 1197 scsi_device_protection(SCpnt->device) || 1198 SCpnt->device->use_10_for_rw) { 1199 SCpnt->cmnd[0] += READ_10 - READ_6; 1200 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1201 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 1202 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 1203 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 1204 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 1205 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 1206 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 1207 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 1208 } else { 1209 if (unlikely(rq->cmd_flags & REQ_FUA)) { 1210 /* 1211 * This happens only if this drive failed 1212 * 10byte rw command with ILLEGAL_REQUEST 1213 * during operation and thus turned off 1214 * use_10_for_rw. 1215 */ 1216 scmd_printk(KERN_ERR, SCpnt, 1217 "FUA write on READ/WRITE(6) drive\n"); 1218 goto out; 1219 } 1220 1221 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 1222 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 1223 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 1224 SCpnt->cmnd[4] = (unsigned char) this_count; 1225 SCpnt->cmnd[5] = 0; 1226 } 1227 SCpnt->sdb.length = this_count * sdp->sector_size; 1228 1229 /* 1230 * We shouldn't disconnect in the middle of a sector, so with a dumb 1231 * host adapter, it's safe to assume that we can at least transfer 1232 * this many bytes between each connect / disconnect. 1233 */ 1234 SCpnt->transfersize = sdp->sector_size; 1235 SCpnt->underflow = this_count << 9; 1236 SCpnt->allowed = SD_MAX_RETRIES; 1237 1238 /* 1239 * This indicates that the command is ready from our end to be 1240 * queued. 1241 */ 1242 ret = BLKPREP_OK; 1243 out: 1244 return ret; 1245 } 1246 1247 static int sd_init_command(struct scsi_cmnd *cmd) 1248 { 1249 struct request *rq = cmd->request; 1250 1251 switch (req_op(rq)) { 1252 case REQ_OP_DISCARD: 1253 switch (scsi_disk(rq->rq_disk)->provisioning_mode) { 1254 case SD_LBP_UNMAP: 1255 return sd_setup_unmap_cmnd(cmd); 1256 case SD_LBP_WS16: 1257 return sd_setup_write_same16_cmnd(cmd, true); 1258 case SD_LBP_WS10: 1259 return sd_setup_write_same10_cmnd(cmd, true); 1260 case SD_LBP_ZERO: 1261 return sd_setup_write_same10_cmnd(cmd, false); 1262 default: 1263 return BLKPREP_INVALID; 1264 } 1265 case REQ_OP_WRITE_ZEROES: 1266 return sd_setup_write_zeroes_cmnd(cmd); 1267 case REQ_OP_WRITE_SAME: 1268 return sd_setup_write_same_cmnd(cmd); 1269 case REQ_OP_FLUSH: 1270 return sd_setup_flush_cmnd(cmd); 1271 case REQ_OP_READ: 1272 case REQ_OP_WRITE: 1273 return sd_setup_read_write_cmnd(cmd); 1274 case REQ_OP_ZONE_REPORT: 1275 return sd_zbc_setup_report_cmnd(cmd); 1276 case REQ_OP_ZONE_RESET: 1277 return sd_zbc_setup_reset_cmnd(cmd); 1278 default: 1279 WARN_ON_ONCE(1); 1280 return BLKPREP_KILL; 1281 } 1282 } 1283 1284 static void sd_uninit_command(struct scsi_cmnd *SCpnt) 1285 { 1286 struct request *rq = SCpnt->request; 1287 u8 *cmnd; 1288 1289 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1290 __free_page(rq->special_vec.bv_page); 1291 1292 if (SCpnt->cmnd != scsi_req(rq)->cmd) { 1293 cmnd = SCpnt->cmnd; 1294 SCpnt->cmnd = NULL; 1295 SCpnt->cmd_len = 0; 1296 mempool_free(cmnd, sd_cdb_pool); 1297 } 1298 } 1299 1300 /** 1301 * sd_open - open a scsi disk device 1302 * @bdev: Block device of the scsi disk to open 1303 * @mode: FMODE_* mask 1304 * 1305 * Returns 0 if successful. Returns a negated errno value in case 1306 * of error. 1307 * 1308 * Note: This can be called from a user context (e.g. fsck(1) ) 1309 * or from within the kernel (e.g. as a result of a mount(1) ). 1310 * In the latter case @inode and @filp carry an abridged amount 1311 * of information as noted above. 1312 * 1313 * Locking: called with bdev->bd_mutex held. 1314 **/ 1315 static int sd_open(struct block_device *bdev, fmode_t mode) 1316 { 1317 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 1318 struct scsi_device *sdev; 1319 int retval; 1320 1321 if (!sdkp) 1322 return -ENXIO; 1323 1324 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 1325 1326 sdev = sdkp->device; 1327 1328 /* 1329 * If the device is in error recovery, wait until it is done. 1330 * If the device is offline, then disallow any access to it. 1331 */ 1332 retval = -ENXIO; 1333 if (!scsi_block_when_processing_errors(sdev)) 1334 goto error_out; 1335 1336 if (sdev->removable || sdkp->write_prot) 1337 check_disk_change(bdev); 1338 1339 /* 1340 * If the drive is empty, just let the open fail. 1341 */ 1342 retval = -ENOMEDIUM; 1343 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 1344 goto error_out; 1345 1346 /* 1347 * If the device has the write protect tab set, have the open fail 1348 * if the user expects to be able to write to the thing. 1349 */ 1350 retval = -EROFS; 1351 if (sdkp->write_prot && (mode & FMODE_WRITE)) 1352 goto error_out; 1353 1354 /* 1355 * It is possible that the disk changing stuff resulted in 1356 * the device being taken offline. If this is the case, 1357 * report this to the user, and don't pretend that the 1358 * open actually succeeded. 1359 */ 1360 retval = -ENXIO; 1361 if (!scsi_device_online(sdev)) 1362 goto error_out; 1363 1364 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 1365 if (scsi_block_when_processing_errors(sdev)) 1366 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 1367 } 1368 1369 return 0; 1370 1371 error_out: 1372 scsi_disk_put(sdkp); 1373 return retval; 1374 } 1375 1376 /** 1377 * sd_release - invoked when the (last) close(2) is called on this 1378 * scsi disk. 1379 * @disk: disk to release 1380 * @mode: FMODE_* mask 1381 * 1382 * Returns 0. 1383 * 1384 * Note: may block (uninterruptible) if error recovery is underway 1385 * on this disk. 1386 * 1387 * Locking: called with bdev->bd_mutex held. 1388 **/ 1389 static void sd_release(struct gendisk *disk, fmode_t mode) 1390 { 1391 struct scsi_disk *sdkp = scsi_disk(disk); 1392 struct scsi_device *sdev = sdkp->device; 1393 1394 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 1395 1396 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 1397 if (scsi_block_when_processing_errors(sdev)) 1398 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 1399 } 1400 1401 /* 1402 * XXX and what if there are packets in flight and this close() 1403 * XXX is followed by a "rmmod sd_mod"? 1404 */ 1405 1406 scsi_disk_put(sdkp); 1407 } 1408 1409 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1410 { 1411 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 1412 struct scsi_device *sdp = sdkp->device; 1413 struct Scsi_Host *host = sdp->host; 1414 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity); 1415 int diskinfo[4]; 1416 1417 /* default to most commonly used values */ 1418 diskinfo[0] = 0x40; /* 1 << 6 */ 1419 diskinfo[1] = 0x20; /* 1 << 5 */ 1420 diskinfo[2] = capacity >> 11; 1421 1422 /* override with calculated, extended default, or driver values */ 1423 if (host->hostt->bios_param) 1424 host->hostt->bios_param(sdp, bdev, capacity, diskinfo); 1425 else 1426 scsicam_bios_param(bdev, capacity, diskinfo); 1427 1428 geo->heads = diskinfo[0]; 1429 geo->sectors = diskinfo[1]; 1430 geo->cylinders = diskinfo[2]; 1431 return 0; 1432 } 1433 1434 /** 1435 * sd_ioctl - process an ioctl 1436 * @bdev: target block device 1437 * @mode: FMODE_* mask 1438 * @cmd: ioctl command number 1439 * @arg: this is third argument given to ioctl(2) system call. 1440 * Often contains a pointer. 1441 * 1442 * Returns 0 if successful (some ioctls return positive numbers on 1443 * success as well). Returns a negated errno value in case of error. 1444 * 1445 * Note: most ioctls are forward onto the block subsystem or further 1446 * down in the scsi subsystem. 1447 **/ 1448 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 1449 unsigned int cmd, unsigned long arg) 1450 { 1451 struct gendisk *disk = bdev->bd_disk; 1452 struct scsi_disk *sdkp = scsi_disk(disk); 1453 struct scsi_device *sdp = sdkp->device; 1454 void __user *p = (void __user *)arg; 1455 int error; 1456 1457 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " 1458 "cmd=0x%x\n", disk->disk_name, cmd)); 1459 1460 error = scsi_verify_blk_ioctl(bdev, cmd); 1461 if (error < 0) 1462 return error; 1463 1464 /* 1465 * If we are in the middle of error recovery, don't let anyone 1466 * else try and use this device. Also, if error recovery fails, it 1467 * may try and take the device offline, in which case all further 1468 * access to the device is prohibited. 1469 */ 1470 error = scsi_ioctl_block_when_processing_errors(sdp, cmd, 1471 (mode & FMODE_NDELAY) != 0); 1472 if (error) 1473 goto out; 1474 1475 if (is_sed_ioctl(cmd)) 1476 return sed_ioctl(sdkp->opal_dev, cmd, p); 1477 1478 /* 1479 * Send SCSI addressing ioctls directly to mid level, send other 1480 * ioctls to block level and then onto mid level if they can't be 1481 * resolved. 1482 */ 1483 switch (cmd) { 1484 case SCSI_IOCTL_GET_IDLUN: 1485 case SCSI_IOCTL_GET_BUS_NUMBER: 1486 error = scsi_ioctl(sdp, cmd, p); 1487 break; 1488 default: 1489 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); 1490 if (error != -ENOTTY) 1491 break; 1492 error = scsi_ioctl(sdp, cmd, p); 1493 break; 1494 } 1495 out: 1496 return error; 1497 } 1498 1499 static void set_media_not_present(struct scsi_disk *sdkp) 1500 { 1501 if (sdkp->media_present) 1502 sdkp->device->changed = 1; 1503 1504 if (sdkp->device->removable) { 1505 sdkp->media_present = 0; 1506 sdkp->capacity = 0; 1507 } 1508 } 1509 1510 static int media_not_present(struct scsi_disk *sdkp, 1511 struct scsi_sense_hdr *sshdr) 1512 { 1513 if (!scsi_sense_valid(sshdr)) 1514 return 0; 1515 1516 /* not invoked for commands that could return deferred errors */ 1517 switch (sshdr->sense_key) { 1518 case UNIT_ATTENTION: 1519 case NOT_READY: 1520 /* medium not present */ 1521 if (sshdr->asc == 0x3A) { 1522 set_media_not_present(sdkp); 1523 return 1; 1524 } 1525 } 1526 return 0; 1527 } 1528 1529 /** 1530 * sd_check_events - check media events 1531 * @disk: kernel device descriptor 1532 * @clearing: disk events currently being cleared 1533 * 1534 * Returns mask of DISK_EVENT_*. 1535 * 1536 * Note: this function is invoked from the block subsystem. 1537 **/ 1538 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) 1539 { 1540 struct scsi_disk *sdkp = scsi_disk_get(disk); 1541 struct scsi_device *sdp; 1542 int retval; 1543 1544 if (!sdkp) 1545 return 0; 1546 1547 sdp = sdkp->device; 1548 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); 1549 1550 /* 1551 * If the device is offline, don't send any commands - just pretend as 1552 * if the command failed. If the device ever comes back online, we 1553 * can deal with it then. It is only because of unrecoverable errors 1554 * that we would ever take a device offline in the first place. 1555 */ 1556 if (!scsi_device_online(sdp)) { 1557 set_media_not_present(sdkp); 1558 goto out; 1559 } 1560 1561 /* 1562 * Using TEST_UNIT_READY enables differentiation between drive with 1563 * no cartridge loaded - NOT READY, drive with changed cartridge - 1564 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1565 * 1566 * Drives that auto spin down. eg iomega jaz 1G, will be started 1567 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1568 * sd_revalidate() is called. 1569 */ 1570 if (scsi_block_when_processing_errors(sdp)) { 1571 struct scsi_sense_hdr sshdr = { 0, }; 1572 1573 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1574 &sshdr); 1575 1576 /* failed to execute TUR, assume media not present */ 1577 if (host_byte(retval)) { 1578 set_media_not_present(sdkp); 1579 goto out; 1580 } 1581 1582 if (media_not_present(sdkp, &sshdr)) 1583 goto out; 1584 } 1585 1586 /* 1587 * For removable scsi disk we have to recognise the presence 1588 * of a disk in the drive. 1589 */ 1590 if (!sdkp->media_present) 1591 sdp->changed = 1; 1592 sdkp->media_present = 1; 1593 out: 1594 /* 1595 * sdp->changed is set under the following conditions: 1596 * 1597 * Medium present state has changed in either direction. 1598 * Device has indicated UNIT_ATTENTION. 1599 */ 1600 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1601 sdp->changed = 0; 1602 scsi_disk_put(sdkp); 1603 return retval; 1604 } 1605 1606 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr) 1607 { 1608 int retries, res; 1609 struct scsi_device *sdp = sdkp->device; 1610 const int timeout = sdp->request_queue->rq_timeout 1611 * SD_FLUSH_TIMEOUT_MULTIPLIER; 1612 struct scsi_sense_hdr my_sshdr; 1613 1614 if (!scsi_device_online(sdp)) 1615 return -ENODEV; 1616 1617 /* caller might not be interested in sense, but we need it */ 1618 if (!sshdr) 1619 sshdr = &my_sshdr; 1620 1621 for (retries = 3; retries > 0; --retries) { 1622 unsigned char cmd[10] = { 0 }; 1623 1624 cmd[0] = SYNCHRONIZE_CACHE; 1625 /* 1626 * Leave the rest of the command zero to indicate 1627 * flush everything. 1628 */ 1629 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr, 1630 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL); 1631 if (res == 0) 1632 break; 1633 } 1634 1635 if (res) { 1636 sd_print_result(sdkp, "Synchronize Cache(10) failed", res); 1637 1638 if (driver_byte(res) == DRIVER_SENSE) 1639 sd_print_sense_hdr(sdkp, sshdr); 1640 1641 /* we need to evaluate the error return */ 1642 if (scsi_sense_valid(sshdr) && 1643 (sshdr->asc == 0x3a || /* medium not present */ 1644 sshdr->asc == 0x20)) /* invalid command */ 1645 /* this is no error here */ 1646 return 0; 1647 1648 switch (host_byte(res)) { 1649 /* ignore errors due to racing a disconnection */ 1650 case DID_BAD_TARGET: 1651 case DID_NO_CONNECT: 1652 return 0; 1653 /* signal the upper layer it might try again */ 1654 case DID_BUS_BUSY: 1655 case DID_IMM_RETRY: 1656 case DID_REQUEUE: 1657 case DID_SOFT_ERROR: 1658 return -EBUSY; 1659 default: 1660 return -EIO; 1661 } 1662 } 1663 return 0; 1664 } 1665 1666 static void sd_rescan(struct device *dev) 1667 { 1668 struct scsi_disk *sdkp = dev_get_drvdata(dev); 1669 1670 revalidate_disk(sdkp->disk); 1671 } 1672 1673 1674 #ifdef CONFIG_COMPAT 1675 /* 1676 * This gets directly called from VFS. When the ioctl 1677 * is not recognized we go back to the other translation paths. 1678 */ 1679 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1680 unsigned int cmd, unsigned long arg) 1681 { 1682 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1683 int error; 1684 1685 error = scsi_ioctl_block_when_processing_errors(sdev, cmd, 1686 (mode & FMODE_NDELAY) != 0); 1687 if (error) 1688 return error; 1689 1690 /* 1691 * Let the static ioctl translation table take care of it. 1692 */ 1693 if (!sdev->host->hostt->compat_ioctl) 1694 return -ENOIOCTLCMD; 1695 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1696 } 1697 #endif 1698 1699 static char sd_pr_type(enum pr_type type) 1700 { 1701 switch (type) { 1702 case PR_WRITE_EXCLUSIVE: 1703 return 0x01; 1704 case PR_EXCLUSIVE_ACCESS: 1705 return 0x03; 1706 case PR_WRITE_EXCLUSIVE_REG_ONLY: 1707 return 0x05; 1708 case PR_EXCLUSIVE_ACCESS_REG_ONLY: 1709 return 0x06; 1710 case PR_WRITE_EXCLUSIVE_ALL_REGS: 1711 return 0x07; 1712 case PR_EXCLUSIVE_ACCESS_ALL_REGS: 1713 return 0x08; 1714 default: 1715 return 0; 1716 } 1717 }; 1718 1719 static int sd_pr_command(struct block_device *bdev, u8 sa, 1720 u64 key, u64 sa_key, u8 type, u8 flags) 1721 { 1722 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1723 struct scsi_sense_hdr sshdr; 1724 int result; 1725 u8 cmd[16] = { 0, }; 1726 u8 data[24] = { 0, }; 1727 1728 cmd[0] = PERSISTENT_RESERVE_OUT; 1729 cmd[1] = sa; 1730 cmd[2] = type; 1731 put_unaligned_be32(sizeof(data), &cmd[5]); 1732 1733 put_unaligned_be64(key, &data[0]); 1734 put_unaligned_be64(sa_key, &data[8]); 1735 data[20] = flags; 1736 1737 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data), 1738 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1739 1740 if (driver_byte(result) == DRIVER_SENSE && 1741 scsi_sense_valid(&sshdr)) { 1742 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result); 1743 scsi_print_sense_hdr(sdev, NULL, &sshdr); 1744 } 1745 1746 return result; 1747 } 1748 1749 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, 1750 u32 flags) 1751 { 1752 if (flags & ~PR_FL_IGNORE_KEY) 1753 return -EOPNOTSUPP; 1754 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00, 1755 old_key, new_key, 0, 1756 (1 << 0) /* APTPL */); 1757 } 1758 1759 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, 1760 u32 flags) 1761 { 1762 if (flags) 1763 return -EOPNOTSUPP; 1764 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0); 1765 } 1766 1767 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type) 1768 { 1769 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0); 1770 } 1771 1772 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, 1773 enum pr_type type, bool abort) 1774 { 1775 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key, 1776 sd_pr_type(type), 0); 1777 } 1778 1779 static int sd_pr_clear(struct block_device *bdev, u64 key) 1780 { 1781 return sd_pr_command(bdev, 0x03, key, 0, 0, 0); 1782 } 1783 1784 static const struct pr_ops sd_pr_ops = { 1785 .pr_register = sd_pr_register, 1786 .pr_reserve = sd_pr_reserve, 1787 .pr_release = sd_pr_release, 1788 .pr_preempt = sd_pr_preempt, 1789 .pr_clear = sd_pr_clear, 1790 }; 1791 1792 static const struct block_device_operations sd_fops = { 1793 .owner = THIS_MODULE, 1794 .open = sd_open, 1795 .release = sd_release, 1796 .ioctl = sd_ioctl, 1797 .getgeo = sd_getgeo, 1798 #ifdef CONFIG_COMPAT 1799 .compat_ioctl = sd_compat_ioctl, 1800 #endif 1801 .check_events = sd_check_events, 1802 .revalidate_disk = sd_revalidate_disk, 1803 .unlock_native_capacity = sd_unlock_native_capacity, 1804 .pr_ops = &sd_pr_ops, 1805 }; 1806 1807 /** 1808 * sd_eh_reset - reset error handling callback 1809 * @scmd: sd-issued command that has failed 1810 * 1811 * This function is called by the SCSI midlayer before starting 1812 * SCSI EH. When counting medium access failures we have to be 1813 * careful to register it only only once per device and SCSI EH run; 1814 * there might be several timed out commands which will cause the 1815 * 'max_medium_access_timeouts' counter to trigger after the first 1816 * SCSI EH run already and set the device to offline. 1817 * So this function resets the internal counter before starting SCSI EH. 1818 **/ 1819 static void sd_eh_reset(struct scsi_cmnd *scmd) 1820 { 1821 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1822 1823 /* New SCSI EH run, reset gate variable */ 1824 sdkp->ignore_medium_access_errors = false; 1825 } 1826 1827 /** 1828 * sd_eh_action - error handling callback 1829 * @scmd: sd-issued command that has failed 1830 * @eh_disp: The recovery disposition suggested by the midlayer 1831 * 1832 * This function is called by the SCSI midlayer upon completion of an 1833 * error test command (currently TEST UNIT READY). The result of sending 1834 * the eh command is passed in eh_disp. We're looking for devices that 1835 * fail medium access commands but are OK with non access commands like 1836 * test unit ready (so wrongly see the device as having a successful 1837 * recovery) 1838 **/ 1839 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp) 1840 { 1841 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1842 struct scsi_device *sdev = scmd->device; 1843 1844 if (!scsi_device_online(sdev) || 1845 !scsi_medium_access_command(scmd) || 1846 host_byte(scmd->result) != DID_TIME_OUT || 1847 eh_disp != SUCCESS) 1848 return eh_disp; 1849 1850 /* 1851 * The device has timed out executing a medium access command. 1852 * However, the TEST UNIT READY command sent during error 1853 * handling completed successfully. Either the device is in the 1854 * process of recovering or has it suffered an internal failure 1855 * that prevents access to the storage medium. 1856 */ 1857 if (!sdkp->ignore_medium_access_errors) { 1858 sdkp->medium_access_timed_out++; 1859 sdkp->ignore_medium_access_errors = true; 1860 } 1861 1862 /* 1863 * If the device keeps failing read/write commands but TEST UNIT 1864 * READY always completes successfully we assume that medium 1865 * access is no longer possible and take the device offline. 1866 */ 1867 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { 1868 scmd_printk(KERN_ERR, scmd, 1869 "Medium access timeout failure. Offlining disk!\n"); 1870 mutex_lock(&sdev->state_mutex); 1871 scsi_device_set_state(sdev, SDEV_OFFLINE); 1872 mutex_unlock(&sdev->state_mutex); 1873 1874 return SUCCESS; 1875 } 1876 1877 return eh_disp; 1878 } 1879 1880 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1881 { 1882 struct request *req = scmd->request; 1883 struct scsi_device *sdev = scmd->device; 1884 unsigned int transferred, good_bytes; 1885 u64 start_lba, end_lba, bad_lba; 1886 1887 /* 1888 * Some commands have a payload smaller than the device logical 1889 * block size (e.g. INQUIRY on a 4K disk). 1890 */ 1891 if (scsi_bufflen(scmd) <= sdev->sector_size) 1892 return 0; 1893 1894 /* Check if we have a 'bad_lba' information */ 1895 if (!scsi_get_sense_info_fld(scmd->sense_buffer, 1896 SCSI_SENSE_BUFFERSIZE, 1897 &bad_lba)) 1898 return 0; 1899 1900 /* 1901 * If the bad lba was reported incorrectly, we have no idea where 1902 * the error is. 1903 */ 1904 start_lba = sectors_to_logical(sdev, blk_rq_pos(req)); 1905 end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd)); 1906 if (bad_lba < start_lba || bad_lba >= end_lba) 1907 return 0; 1908 1909 /* 1910 * resid is optional but mostly filled in. When it's unused, 1911 * its value is zero, so we assume the whole buffer transferred 1912 */ 1913 transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 1914 1915 /* This computation should always be done in terms of the 1916 * resolution of the device's medium. 1917 */ 1918 good_bytes = logical_to_bytes(sdev, bad_lba - start_lba); 1919 1920 return min(good_bytes, transferred); 1921 } 1922 1923 /** 1924 * sd_done - bottom half handler: called when the lower level 1925 * driver has completed (successfully or otherwise) a scsi command. 1926 * @SCpnt: mid-level's per command structure. 1927 * 1928 * Note: potentially run from within an ISR. Must not block. 1929 **/ 1930 static int sd_done(struct scsi_cmnd *SCpnt) 1931 { 1932 int result = SCpnt->result; 1933 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1934 unsigned int sector_size = SCpnt->device->sector_size; 1935 unsigned int resid; 1936 struct scsi_sense_hdr sshdr; 1937 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1938 struct request *req = SCpnt->request; 1939 int sense_valid = 0; 1940 int sense_deferred = 0; 1941 1942 switch (req_op(req)) { 1943 case REQ_OP_DISCARD: 1944 case REQ_OP_WRITE_ZEROES: 1945 case REQ_OP_WRITE_SAME: 1946 case REQ_OP_ZONE_RESET: 1947 if (!result) { 1948 good_bytes = blk_rq_bytes(req); 1949 scsi_set_resid(SCpnt, 0); 1950 } else { 1951 good_bytes = 0; 1952 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 1953 } 1954 break; 1955 case REQ_OP_ZONE_REPORT: 1956 if (!result) { 1957 good_bytes = scsi_bufflen(SCpnt) 1958 - scsi_get_resid(SCpnt); 1959 scsi_set_resid(SCpnt, 0); 1960 } else { 1961 good_bytes = 0; 1962 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 1963 } 1964 break; 1965 default: 1966 /* 1967 * In case of bogus fw or device, we could end up having 1968 * an unaligned partial completion. Check this here and force 1969 * alignment. 1970 */ 1971 resid = scsi_get_resid(SCpnt); 1972 if (resid & (sector_size - 1)) { 1973 sd_printk(KERN_INFO, sdkp, 1974 "Unaligned partial completion (resid=%u, sector_sz=%u)\n", 1975 resid, sector_size); 1976 resid = min(scsi_bufflen(SCpnt), 1977 round_up(resid, sector_size)); 1978 scsi_set_resid(SCpnt, resid); 1979 } 1980 } 1981 1982 if (result) { 1983 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1984 if (sense_valid) 1985 sense_deferred = scsi_sense_is_deferred(&sshdr); 1986 } 1987 sdkp->medium_access_timed_out = 0; 1988 1989 if (driver_byte(result) != DRIVER_SENSE && 1990 (!sense_valid || sense_deferred)) 1991 goto out; 1992 1993 switch (sshdr.sense_key) { 1994 case HARDWARE_ERROR: 1995 case MEDIUM_ERROR: 1996 good_bytes = sd_completed_bytes(SCpnt); 1997 break; 1998 case RECOVERED_ERROR: 1999 good_bytes = scsi_bufflen(SCpnt); 2000 break; 2001 case NO_SENSE: 2002 /* This indicates a false check condition, so ignore it. An 2003 * unknown amount of data was transferred so treat it as an 2004 * error. 2005 */ 2006 SCpnt->result = 0; 2007 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2008 break; 2009 case ABORTED_COMMAND: 2010 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 2011 good_bytes = sd_completed_bytes(SCpnt); 2012 break; 2013 case ILLEGAL_REQUEST: 2014 switch (sshdr.asc) { 2015 case 0x10: /* DIX: Host detected corruption */ 2016 good_bytes = sd_completed_bytes(SCpnt); 2017 break; 2018 case 0x20: /* INVALID COMMAND OPCODE */ 2019 case 0x24: /* INVALID FIELD IN CDB */ 2020 switch (SCpnt->cmnd[0]) { 2021 case UNMAP: 2022 sd_config_discard(sdkp, SD_LBP_DISABLE); 2023 break; 2024 case WRITE_SAME_16: 2025 case WRITE_SAME: 2026 if (SCpnt->cmnd[1] & 8) { /* UNMAP */ 2027 sd_config_discard(sdkp, SD_LBP_DISABLE); 2028 } else { 2029 sdkp->device->no_write_same = 1; 2030 sd_config_write_same(sdkp); 2031 req->rq_flags |= RQF_QUIET; 2032 } 2033 break; 2034 } 2035 } 2036 break; 2037 default: 2038 break; 2039 } 2040 2041 out: 2042 if (sd_is_zoned(sdkp)) 2043 sd_zbc_complete(SCpnt, good_bytes, &sshdr); 2044 2045 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 2046 "sd_done: completed %d of %d bytes\n", 2047 good_bytes, scsi_bufflen(SCpnt))); 2048 2049 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt) && 2050 good_bytes) 2051 t10_pi_complete(SCpnt->request, sdkp->protection_type, 2052 good_bytes / scsi_prot_interval(SCpnt)); 2053 2054 return good_bytes; 2055 } 2056 2057 /* 2058 * spinup disk - called only in sd_revalidate_disk() 2059 */ 2060 static void 2061 sd_spinup_disk(struct scsi_disk *sdkp) 2062 { 2063 unsigned char cmd[10]; 2064 unsigned long spintime_expire = 0; 2065 int retries, spintime; 2066 unsigned int the_result; 2067 struct scsi_sense_hdr sshdr; 2068 int sense_valid = 0; 2069 2070 spintime = 0; 2071 2072 /* Spin up drives, as required. Only do this at boot time */ 2073 /* Spinup needs to be done for module loads too. */ 2074 do { 2075 retries = 0; 2076 2077 do { 2078 cmd[0] = TEST_UNIT_READY; 2079 memset((void *) &cmd[1], 0, 9); 2080 2081 the_result = scsi_execute_req(sdkp->device, cmd, 2082 DMA_NONE, NULL, 0, 2083 &sshdr, SD_TIMEOUT, 2084 SD_MAX_RETRIES, NULL); 2085 2086 /* 2087 * If the drive has indicated to us that it 2088 * doesn't have any media in it, don't bother 2089 * with any more polling. 2090 */ 2091 if (media_not_present(sdkp, &sshdr)) 2092 return; 2093 2094 if (the_result) 2095 sense_valid = scsi_sense_valid(&sshdr); 2096 retries++; 2097 } while (retries < 3 && 2098 (!scsi_status_is_good(the_result) || 2099 ((driver_byte(the_result) == DRIVER_SENSE) && 2100 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 2101 2102 if (driver_byte(the_result) != DRIVER_SENSE) { 2103 /* no sense, TUR either succeeded or failed 2104 * with a status error */ 2105 if(!spintime && !scsi_status_is_good(the_result)) { 2106 sd_print_result(sdkp, "Test Unit Ready failed", 2107 the_result); 2108 } 2109 break; 2110 } 2111 2112 /* 2113 * The device does not want the automatic start to be issued. 2114 */ 2115 if (sdkp->device->no_start_on_add) 2116 break; 2117 2118 if (sense_valid && sshdr.sense_key == NOT_READY) { 2119 if (sshdr.asc == 4 && sshdr.ascq == 3) 2120 break; /* manual intervention required */ 2121 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 2122 break; /* standby */ 2123 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 2124 break; /* unavailable */ 2125 if (sshdr.asc == 4 && sshdr.ascq == 0x1b) 2126 break; /* sanitize in progress */ 2127 /* 2128 * Issue command to spin up drive when not ready 2129 */ 2130 if (!spintime) { 2131 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 2132 cmd[0] = START_STOP; 2133 cmd[1] = 1; /* Return immediately */ 2134 memset((void *) &cmd[2], 0, 8); 2135 cmd[4] = 1; /* Start spin cycle */ 2136 if (sdkp->device->start_stop_pwr_cond) 2137 cmd[4] |= 1 << 4; 2138 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 2139 NULL, 0, &sshdr, 2140 SD_TIMEOUT, SD_MAX_RETRIES, 2141 NULL); 2142 spintime_expire = jiffies + 100 * HZ; 2143 spintime = 1; 2144 } 2145 /* Wait 1 second for next try */ 2146 msleep(1000); 2147 printk(KERN_CONT "."); 2148 2149 /* 2150 * Wait for USB flash devices with slow firmware. 2151 * Yes, this sense key/ASC combination shouldn't 2152 * occur here. It's characteristic of these devices. 2153 */ 2154 } else if (sense_valid && 2155 sshdr.sense_key == UNIT_ATTENTION && 2156 sshdr.asc == 0x28) { 2157 if (!spintime) { 2158 spintime_expire = jiffies + 5 * HZ; 2159 spintime = 1; 2160 } 2161 /* Wait 1 second for next try */ 2162 msleep(1000); 2163 } else { 2164 /* we don't understand the sense code, so it's 2165 * probably pointless to loop */ 2166 if(!spintime) { 2167 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 2168 sd_print_sense_hdr(sdkp, &sshdr); 2169 } 2170 break; 2171 } 2172 2173 } while (spintime && time_before_eq(jiffies, spintime_expire)); 2174 2175 if (spintime) { 2176 if (scsi_status_is_good(the_result)) 2177 printk(KERN_CONT "ready\n"); 2178 else 2179 printk(KERN_CONT "not responding...\n"); 2180 } 2181 } 2182 2183 /* 2184 * Determine whether disk supports Data Integrity Field. 2185 */ 2186 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 2187 { 2188 struct scsi_device *sdp = sdkp->device; 2189 u8 type; 2190 int ret = 0; 2191 2192 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 2193 return ret; 2194 2195 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 2196 2197 if (type > T10_PI_TYPE3_PROTECTION) 2198 ret = -ENODEV; 2199 else if (scsi_host_dif_capable(sdp->host, type)) 2200 ret = 1; 2201 2202 if (sdkp->first_scan || type != sdkp->protection_type) 2203 switch (ret) { 2204 case -ENODEV: 2205 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ 2206 " protection type %u. Disabling disk!\n", 2207 type); 2208 break; 2209 case 1: 2210 sd_printk(KERN_NOTICE, sdkp, 2211 "Enabling DIF Type %u protection\n", type); 2212 break; 2213 case 0: 2214 sd_printk(KERN_NOTICE, sdkp, 2215 "Disabling DIF Type %u protection\n", type); 2216 break; 2217 } 2218 2219 sdkp->protection_type = type; 2220 2221 return ret; 2222 } 2223 2224 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 2225 struct scsi_sense_hdr *sshdr, int sense_valid, 2226 int the_result) 2227 { 2228 if (driver_byte(the_result) == DRIVER_SENSE) 2229 sd_print_sense_hdr(sdkp, sshdr); 2230 else 2231 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 2232 2233 /* 2234 * Set dirty bit for removable devices if not ready - 2235 * sometimes drives will not report this properly. 2236 */ 2237 if (sdp->removable && 2238 sense_valid && sshdr->sense_key == NOT_READY) 2239 set_media_not_present(sdkp); 2240 2241 /* 2242 * We used to set media_present to 0 here to indicate no media 2243 * in the drive, but some drives fail read capacity even with 2244 * media present, so we can't do that. 2245 */ 2246 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 2247 } 2248 2249 #define RC16_LEN 32 2250 #if RC16_LEN > SD_BUF_SIZE 2251 #error RC16_LEN must not be more than SD_BUF_SIZE 2252 #endif 2253 2254 #define READ_CAPACITY_RETRIES_ON_RESET 10 2255 2256 /* 2257 * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set 2258 * and the reported logical block size is bigger than 512 bytes. Note 2259 * that last_sector is a u64 and therefore logical_to_sectors() is not 2260 * applicable. 2261 */ 2262 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size) 2263 { 2264 u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9); 2265 2266 if (sizeof(sector_t) == 4 && last_sector > U32_MAX) 2267 return false; 2268 2269 return true; 2270 } 2271 2272 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 2273 unsigned char *buffer) 2274 { 2275 unsigned char cmd[16]; 2276 struct scsi_sense_hdr sshdr; 2277 int sense_valid = 0; 2278 int the_result; 2279 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2280 unsigned int alignment; 2281 unsigned long long lba; 2282 unsigned sector_size; 2283 2284 if (sdp->no_read_capacity_16) 2285 return -EINVAL; 2286 2287 do { 2288 memset(cmd, 0, 16); 2289 cmd[0] = SERVICE_ACTION_IN_16; 2290 cmd[1] = SAI_READ_CAPACITY_16; 2291 cmd[13] = RC16_LEN; 2292 memset(buffer, 0, RC16_LEN); 2293 2294 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2295 buffer, RC16_LEN, &sshdr, 2296 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2297 2298 if (media_not_present(sdkp, &sshdr)) 2299 return -ENODEV; 2300 2301 if (the_result) { 2302 sense_valid = scsi_sense_valid(&sshdr); 2303 if (sense_valid && 2304 sshdr.sense_key == ILLEGAL_REQUEST && 2305 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 2306 sshdr.ascq == 0x00) 2307 /* Invalid Command Operation Code or 2308 * Invalid Field in CDB, just retry 2309 * silently with RC10 */ 2310 return -EINVAL; 2311 if (sense_valid && 2312 sshdr.sense_key == UNIT_ATTENTION && 2313 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2314 /* Device reset might occur several times, 2315 * give it one more chance */ 2316 if (--reset_retries > 0) 2317 continue; 2318 } 2319 retries--; 2320 2321 } while (the_result && retries); 2322 2323 if (the_result) { 2324 sd_print_result(sdkp, "Read Capacity(16) failed", the_result); 2325 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2326 return -EINVAL; 2327 } 2328 2329 sector_size = get_unaligned_be32(&buffer[8]); 2330 lba = get_unaligned_be64(&buffer[0]); 2331 2332 if (sd_read_protection_type(sdkp, buffer) < 0) { 2333 sdkp->capacity = 0; 2334 return -ENODEV; 2335 } 2336 2337 if (!sd_addressable_capacity(lba, sector_size)) { 2338 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2339 "kernel compiled with support for large block " 2340 "devices.\n"); 2341 sdkp->capacity = 0; 2342 return -EOVERFLOW; 2343 } 2344 2345 /* Logical blocks per physical block exponent */ 2346 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 2347 2348 /* RC basis */ 2349 sdkp->rc_basis = (buffer[12] >> 4) & 0x3; 2350 2351 /* Lowest aligned logical block */ 2352 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 2353 blk_queue_alignment_offset(sdp->request_queue, alignment); 2354 if (alignment && sdkp->first_scan) 2355 sd_printk(KERN_NOTICE, sdkp, 2356 "physical block alignment offset: %u\n", alignment); 2357 2358 if (buffer[14] & 0x80) { /* LBPME */ 2359 sdkp->lbpme = 1; 2360 2361 if (buffer[14] & 0x40) /* LBPRZ */ 2362 sdkp->lbprz = 1; 2363 2364 sd_config_discard(sdkp, SD_LBP_WS16); 2365 } 2366 2367 sdkp->capacity = lba + 1; 2368 return sector_size; 2369 } 2370 2371 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 2372 unsigned char *buffer) 2373 { 2374 unsigned char cmd[16]; 2375 struct scsi_sense_hdr sshdr; 2376 int sense_valid = 0; 2377 int the_result; 2378 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2379 sector_t lba; 2380 unsigned sector_size; 2381 2382 do { 2383 cmd[0] = READ_CAPACITY; 2384 memset(&cmd[1], 0, 9); 2385 memset(buffer, 0, 8); 2386 2387 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2388 buffer, 8, &sshdr, 2389 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2390 2391 if (media_not_present(sdkp, &sshdr)) 2392 return -ENODEV; 2393 2394 if (the_result) { 2395 sense_valid = scsi_sense_valid(&sshdr); 2396 if (sense_valid && 2397 sshdr.sense_key == UNIT_ATTENTION && 2398 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2399 /* Device reset might occur several times, 2400 * give it one more chance */ 2401 if (--reset_retries > 0) 2402 continue; 2403 } 2404 retries--; 2405 2406 } while (the_result && retries); 2407 2408 if (the_result) { 2409 sd_print_result(sdkp, "Read Capacity(10) failed", the_result); 2410 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2411 return -EINVAL; 2412 } 2413 2414 sector_size = get_unaligned_be32(&buffer[4]); 2415 lba = get_unaligned_be32(&buffer[0]); 2416 2417 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 2418 /* Some buggy (usb cardreader) devices return an lba of 2419 0xffffffff when the want to report a size of 0 (with 2420 which they really mean no media is present) */ 2421 sdkp->capacity = 0; 2422 sdkp->physical_block_size = sector_size; 2423 return sector_size; 2424 } 2425 2426 if (!sd_addressable_capacity(lba, sector_size)) { 2427 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2428 "kernel compiled with support for large block " 2429 "devices.\n"); 2430 sdkp->capacity = 0; 2431 return -EOVERFLOW; 2432 } 2433 2434 sdkp->capacity = lba + 1; 2435 sdkp->physical_block_size = sector_size; 2436 return sector_size; 2437 } 2438 2439 static int sd_try_rc16_first(struct scsi_device *sdp) 2440 { 2441 if (sdp->host->max_cmd_len < 16) 2442 return 0; 2443 if (sdp->try_rc_10_first) 2444 return 0; 2445 if (sdp->scsi_level > SCSI_SPC_2) 2446 return 1; 2447 if (scsi_device_protection(sdp)) 2448 return 1; 2449 return 0; 2450 } 2451 2452 /* 2453 * read disk capacity 2454 */ 2455 static void 2456 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 2457 { 2458 int sector_size; 2459 struct scsi_device *sdp = sdkp->device; 2460 2461 if (sd_try_rc16_first(sdp)) { 2462 sector_size = read_capacity_16(sdkp, sdp, buffer); 2463 if (sector_size == -EOVERFLOW) 2464 goto got_data; 2465 if (sector_size == -ENODEV) 2466 return; 2467 if (sector_size < 0) 2468 sector_size = read_capacity_10(sdkp, sdp, buffer); 2469 if (sector_size < 0) 2470 return; 2471 } else { 2472 sector_size = read_capacity_10(sdkp, sdp, buffer); 2473 if (sector_size == -EOVERFLOW) 2474 goto got_data; 2475 if (sector_size < 0) 2476 return; 2477 if ((sizeof(sdkp->capacity) > 4) && 2478 (sdkp->capacity > 0xffffffffULL)) { 2479 int old_sector_size = sector_size; 2480 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 2481 "Trying to use READ CAPACITY(16).\n"); 2482 sector_size = read_capacity_16(sdkp, sdp, buffer); 2483 if (sector_size < 0) { 2484 sd_printk(KERN_NOTICE, sdkp, 2485 "Using 0xffffffff as device size\n"); 2486 sdkp->capacity = 1 + (sector_t) 0xffffffff; 2487 sector_size = old_sector_size; 2488 goto got_data; 2489 } 2490 /* Remember that READ CAPACITY(16) succeeded */ 2491 sdp->try_rc_10_first = 0; 2492 } 2493 } 2494 2495 /* Some devices are known to return the total number of blocks, 2496 * not the highest block number. Some devices have versions 2497 * which do this and others which do not. Some devices we might 2498 * suspect of doing this but we don't know for certain. 2499 * 2500 * If we know the reported capacity is wrong, decrement it. If 2501 * we can only guess, then assume the number of blocks is even 2502 * (usually true but not always) and err on the side of lowering 2503 * the capacity. 2504 */ 2505 if (sdp->fix_capacity || 2506 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 2507 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 2508 "from its reported value: %llu\n", 2509 (unsigned long long) sdkp->capacity); 2510 --sdkp->capacity; 2511 } 2512 2513 got_data: 2514 if (sector_size == 0) { 2515 sector_size = 512; 2516 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 2517 "assuming 512.\n"); 2518 } 2519 2520 if (sector_size != 512 && 2521 sector_size != 1024 && 2522 sector_size != 2048 && 2523 sector_size != 4096) { 2524 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 2525 sector_size); 2526 /* 2527 * The user might want to re-format the drive with 2528 * a supported sectorsize. Once this happens, it 2529 * would be relatively trivial to set the thing up. 2530 * For this reason, we leave the thing in the table. 2531 */ 2532 sdkp->capacity = 0; 2533 /* 2534 * set a bogus sector size so the normal read/write 2535 * logic in the block layer will eventually refuse any 2536 * request on this device without tripping over power 2537 * of two sector size assumptions 2538 */ 2539 sector_size = 512; 2540 } 2541 blk_queue_logical_block_size(sdp->request_queue, sector_size); 2542 blk_queue_physical_block_size(sdp->request_queue, 2543 sdkp->physical_block_size); 2544 sdkp->device->sector_size = sector_size; 2545 2546 if (sdkp->capacity > 0xffffffff) 2547 sdp->use_16_for_rw = 1; 2548 2549 } 2550 2551 /* 2552 * Print disk capacity 2553 */ 2554 static void 2555 sd_print_capacity(struct scsi_disk *sdkp, 2556 sector_t old_capacity) 2557 { 2558 int sector_size = sdkp->device->sector_size; 2559 char cap_str_2[10], cap_str_10[10]; 2560 2561 string_get_size(sdkp->capacity, sector_size, 2562 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); 2563 string_get_size(sdkp->capacity, sector_size, 2564 STRING_UNITS_10, cap_str_10, 2565 sizeof(cap_str_10)); 2566 2567 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 2568 sd_printk(KERN_NOTICE, sdkp, 2569 "%llu %d-byte logical blocks: (%s/%s)\n", 2570 (unsigned long long)sdkp->capacity, 2571 sector_size, cap_str_10, cap_str_2); 2572 2573 if (sdkp->physical_block_size != sector_size) 2574 sd_printk(KERN_NOTICE, sdkp, 2575 "%u-byte physical blocks\n", 2576 sdkp->physical_block_size); 2577 2578 sd_zbc_print_zones(sdkp); 2579 } 2580 } 2581 2582 /* called with buffer of length 512 */ 2583 static inline int 2584 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 2585 unsigned char *buffer, int len, struct scsi_mode_data *data, 2586 struct scsi_sense_hdr *sshdr) 2587 { 2588 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 2589 SD_TIMEOUT, SD_MAX_RETRIES, data, 2590 sshdr); 2591 } 2592 2593 /* 2594 * read write protect setting, if possible - called only in sd_revalidate_disk() 2595 * called with buffer of length SD_BUF_SIZE 2596 */ 2597 static void 2598 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 2599 { 2600 int res; 2601 struct scsi_device *sdp = sdkp->device; 2602 struct scsi_mode_data data; 2603 int disk_ro = get_disk_ro(sdkp->disk); 2604 int old_wp = sdkp->write_prot; 2605 2606 set_disk_ro(sdkp->disk, 0); 2607 if (sdp->skip_ms_page_3f) { 2608 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 2609 return; 2610 } 2611 2612 if (sdp->use_192_bytes_for_3f) { 2613 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 2614 } else { 2615 /* 2616 * First attempt: ask for all pages (0x3F), but only 4 bytes. 2617 * We have to start carefully: some devices hang if we ask 2618 * for more than is available. 2619 */ 2620 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 2621 2622 /* 2623 * Second attempt: ask for page 0 When only page 0 is 2624 * implemented, a request for page 3F may return Sense Key 2625 * 5: Illegal Request, Sense Code 24: Invalid field in 2626 * CDB. 2627 */ 2628 if (!scsi_status_is_good(res)) 2629 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 2630 2631 /* 2632 * Third attempt: ask 255 bytes, as we did earlier. 2633 */ 2634 if (!scsi_status_is_good(res)) 2635 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 2636 &data, NULL); 2637 } 2638 2639 if (!scsi_status_is_good(res)) { 2640 sd_first_printk(KERN_WARNING, sdkp, 2641 "Test WP failed, assume Write Enabled\n"); 2642 } else { 2643 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 2644 set_disk_ro(sdkp->disk, sdkp->write_prot || disk_ro); 2645 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 2646 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 2647 sdkp->write_prot ? "on" : "off"); 2648 sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer); 2649 } 2650 } 2651 } 2652 2653 /* 2654 * sd_read_cache_type - called only from sd_revalidate_disk() 2655 * called with buffer of length SD_BUF_SIZE 2656 */ 2657 static void 2658 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 2659 { 2660 int len = 0, res; 2661 struct scsi_device *sdp = sdkp->device; 2662 2663 int dbd; 2664 int modepage; 2665 int first_len; 2666 struct scsi_mode_data data; 2667 struct scsi_sense_hdr sshdr; 2668 int old_wce = sdkp->WCE; 2669 int old_rcd = sdkp->RCD; 2670 int old_dpofua = sdkp->DPOFUA; 2671 2672 2673 if (sdkp->cache_override) 2674 return; 2675 2676 first_len = 4; 2677 if (sdp->skip_ms_page_8) { 2678 if (sdp->type == TYPE_RBC) 2679 goto defaults; 2680 else { 2681 if (sdp->skip_ms_page_3f) 2682 goto defaults; 2683 modepage = 0x3F; 2684 if (sdp->use_192_bytes_for_3f) 2685 first_len = 192; 2686 dbd = 0; 2687 } 2688 } else if (sdp->type == TYPE_RBC) { 2689 modepage = 6; 2690 dbd = 8; 2691 } else { 2692 modepage = 8; 2693 dbd = 0; 2694 } 2695 2696 /* cautiously ask */ 2697 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, 2698 &data, &sshdr); 2699 2700 if (!scsi_status_is_good(res)) 2701 goto bad_sense; 2702 2703 if (!data.header_length) { 2704 modepage = 6; 2705 first_len = 0; 2706 sd_first_printk(KERN_ERR, sdkp, 2707 "Missing header in MODE_SENSE response\n"); 2708 } 2709 2710 /* that went OK, now ask for the proper length */ 2711 len = data.length; 2712 2713 /* 2714 * We're only interested in the first three bytes, actually. 2715 * But the data cache page is defined for the first 20. 2716 */ 2717 if (len < 3) 2718 goto bad_sense; 2719 else if (len > SD_BUF_SIZE) { 2720 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " 2721 "data from %d to %d bytes\n", len, SD_BUF_SIZE); 2722 len = SD_BUF_SIZE; 2723 } 2724 if (modepage == 0x3F && sdp->use_192_bytes_for_3f) 2725 len = 192; 2726 2727 /* Get the data */ 2728 if (len > first_len) 2729 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, 2730 &data, &sshdr); 2731 2732 if (scsi_status_is_good(res)) { 2733 int offset = data.header_length + data.block_descriptor_length; 2734 2735 while (offset < len) { 2736 u8 page_code = buffer[offset] & 0x3F; 2737 u8 spf = buffer[offset] & 0x40; 2738 2739 if (page_code == 8 || page_code == 6) { 2740 /* We're interested only in the first 3 bytes. 2741 */ 2742 if (len - offset <= 2) { 2743 sd_first_printk(KERN_ERR, sdkp, 2744 "Incomplete mode parameter " 2745 "data\n"); 2746 goto defaults; 2747 } else { 2748 modepage = page_code; 2749 goto Page_found; 2750 } 2751 } else { 2752 /* Go to the next page */ 2753 if (spf && len - offset > 3) 2754 offset += 4 + (buffer[offset+2] << 8) + 2755 buffer[offset+3]; 2756 else if (!spf && len - offset > 1) 2757 offset += 2 + buffer[offset+1]; 2758 else { 2759 sd_first_printk(KERN_ERR, sdkp, 2760 "Incomplete mode " 2761 "parameter data\n"); 2762 goto defaults; 2763 } 2764 } 2765 } 2766 2767 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n"); 2768 goto defaults; 2769 2770 Page_found: 2771 if (modepage == 8) { 2772 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 2773 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 2774 } else { 2775 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 2776 sdkp->RCD = 0; 2777 } 2778 2779 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 2780 if (sdp->broken_fua) { 2781 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n"); 2782 sdkp->DPOFUA = 0; 2783 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw && 2784 !sdkp->device->use_16_for_rw) { 2785 sd_first_printk(KERN_NOTICE, sdkp, 2786 "Uses READ/WRITE(6), disabling FUA\n"); 2787 sdkp->DPOFUA = 0; 2788 } 2789 2790 /* No cache flush allowed for write protected devices */ 2791 if (sdkp->WCE && sdkp->write_prot) 2792 sdkp->WCE = 0; 2793 2794 if (sdkp->first_scan || old_wce != sdkp->WCE || 2795 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 2796 sd_printk(KERN_NOTICE, sdkp, 2797 "Write cache: %s, read cache: %s, %s\n", 2798 sdkp->WCE ? "enabled" : "disabled", 2799 sdkp->RCD ? "disabled" : "enabled", 2800 sdkp->DPOFUA ? "supports DPO and FUA" 2801 : "doesn't support DPO or FUA"); 2802 2803 return; 2804 } 2805 2806 bad_sense: 2807 if (scsi_sense_valid(&sshdr) && 2808 sshdr.sense_key == ILLEGAL_REQUEST && 2809 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 2810 /* Invalid field in CDB */ 2811 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 2812 else 2813 sd_first_printk(KERN_ERR, sdkp, 2814 "Asking for cache data failed\n"); 2815 2816 defaults: 2817 if (sdp->wce_default_on) { 2818 sd_first_printk(KERN_NOTICE, sdkp, 2819 "Assuming drive cache: write back\n"); 2820 sdkp->WCE = 1; 2821 } else { 2822 sd_first_printk(KERN_ERR, sdkp, 2823 "Assuming drive cache: write through\n"); 2824 sdkp->WCE = 0; 2825 } 2826 sdkp->RCD = 0; 2827 sdkp->DPOFUA = 0; 2828 } 2829 2830 /* 2831 * The ATO bit indicates whether the DIF application tag is available 2832 * for use by the operating system. 2833 */ 2834 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 2835 { 2836 int res, offset; 2837 struct scsi_device *sdp = sdkp->device; 2838 struct scsi_mode_data data; 2839 struct scsi_sense_hdr sshdr; 2840 2841 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 2842 return; 2843 2844 if (sdkp->protection_type == 0) 2845 return; 2846 2847 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 2848 SD_MAX_RETRIES, &data, &sshdr); 2849 2850 if (!scsi_status_is_good(res) || !data.header_length || 2851 data.length < 6) { 2852 sd_first_printk(KERN_WARNING, sdkp, 2853 "getting Control mode page failed, assume no ATO\n"); 2854 2855 if (scsi_sense_valid(&sshdr)) 2856 sd_print_sense_hdr(sdkp, &sshdr); 2857 2858 return; 2859 } 2860 2861 offset = data.header_length + data.block_descriptor_length; 2862 2863 if ((buffer[offset] & 0x3f) != 0x0a) { 2864 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2865 return; 2866 } 2867 2868 if ((buffer[offset + 5] & 0x80) == 0) 2869 return; 2870 2871 sdkp->ATO = 1; 2872 2873 return; 2874 } 2875 2876 /** 2877 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2878 * @sdkp: disk to query 2879 */ 2880 static void sd_read_block_limits(struct scsi_disk *sdkp) 2881 { 2882 unsigned int sector_sz = sdkp->device->sector_size; 2883 const int vpd_len = 64; 2884 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2885 2886 if (!buffer || 2887 /* Block Limits VPD */ 2888 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2889 goto out; 2890 2891 blk_queue_io_min(sdkp->disk->queue, 2892 get_unaligned_be16(&buffer[6]) * sector_sz); 2893 2894 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]); 2895 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]); 2896 2897 if (buffer[3] == 0x3c) { 2898 unsigned int lba_count, desc_count; 2899 2900 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); 2901 2902 if (!sdkp->lbpme) 2903 goto out; 2904 2905 lba_count = get_unaligned_be32(&buffer[20]); 2906 desc_count = get_unaligned_be32(&buffer[24]); 2907 2908 if (lba_count && desc_count) 2909 sdkp->max_unmap_blocks = lba_count; 2910 2911 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); 2912 2913 if (buffer[32] & 0x80) 2914 sdkp->unmap_alignment = 2915 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2916 2917 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ 2918 2919 if (sdkp->max_unmap_blocks) 2920 sd_config_discard(sdkp, SD_LBP_UNMAP); 2921 else 2922 sd_config_discard(sdkp, SD_LBP_WS16); 2923 2924 } else { /* LBP VPD page tells us what to use */ 2925 if (sdkp->lbpu && sdkp->max_unmap_blocks) 2926 sd_config_discard(sdkp, SD_LBP_UNMAP); 2927 else if (sdkp->lbpws) 2928 sd_config_discard(sdkp, SD_LBP_WS16); 2929 else if (sdkp->lbpws10) 2930 sd_config_discard(sdkp, SD_LBP_WS10); 2931 else 2932 sd_config_discard(sdkp, SD_LBP_DISABLE); 2933 } 2934 } 2935 2936 out: 2937 kfree(buffer); 2938 } 2939 2940 /** 2941 * sd_read_block_characteristics - Query block dev. characteristics 2942 * @sdkp: disk to query 2943 */ 2944 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2945 { 2946 struct request_queue *q = sdkp->disk->queue; 2947 unsigned char *buffer; 2948 u16 rot; 2949 const int vpd_len = 64; 2950 2951 buffer = kmalloc(vpd_len, GFP_KERNEL); 2952 2953 if (!buffer || 2954 /* Block Device Characteristics VPD */ 2955 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2956 goto out; 2957 2958 rot = get_unaligned_be16(&buffer[4]); 2959 2960 if (rot == 1) { 2961 blk_queue_flag_set(QUEUE_FLAG_NONROT, q); 2962 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q); 2963 } else { 2964 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q); 2965 blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q); 2966 } 2967 2968 if (sdkp->device->type == TYPE_ZBC) { 2969 /* Host-managed */ 2970 q->limits.zoned = BLK_ZONED_HM; 2971 } else { 2972 sdkp->zoned = (buffer[8] >> 4) & 3; 2973 if (sdkp->zoned == 1) 2974 /* Host-aware */ 2975 q->limits.zoned = BLK_ZONED_HA; 2976 else 2977 /* 2978 * Treat drive-managed devices as 2979 * regular block devices. 2980 */ 2981 q->limits.zoned = BLK_ZONED_NONE; 2982 } 2983 if (blk_queue_is_zoned(q) && sdkp->first_scan) 2984 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n", 2985 q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware"); 2986 2987 out: 2988 kfree(buffer); 2989 } 2990 2991 /** 2992 * sd_read_block_provisioning - Query provisioning VPD page 2993 * @sdkp: disk to query 2994 */ 2995 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 2996 { 2997 unsigned char *buffer; 2998 const int vpd_len = 8; 2999 3000 if (sdkp->lbpme == 0) 3001 return; 3002 3003 buffer = kmalloc(vpd_len, GFP_KERNEL); 3004 3005 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) 3006 goto out; 3007 3008 sdkp->lbpvpd = 1; 3009 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ 3010 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ 3011 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ 3012 3013 out: 3014 kfree(buffer); 3015 } 3016 3017 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) 3018 { 3019 struct scsi_device *sdev = sdkp->device; 3020 3021 if (sdev->host->no_write_same) { 3022 sdev->no_write_same = 1; 3023 3024 return; 3025 } 3026 3027 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) { 3028 /* too large values might cause issues with arcmsr */ 3029 int vpd_buf_len = 64; 3030 3031 sdev->no_report_opcodes = 1; 3032 3033 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION 3034 * CODES is unsupported and the device has an ATA 3035 * Information VPD page (SAT). 3036 */ 3037 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len)) 3038 sdev->no_write_same = 1; 3039 } 3040 3041 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1) 3042 sdkp->ws16 = 1; 3043 3044 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1) 3045 sdkp->ws10 = 1; 3046 } 3047 3048 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer) 3049 { 3050 struct scsi_device *sdev = sdkp->device; 3051 3052 if (!sdev->security_supported) 3053 return; 3054 3055 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, 3056 SECURITY_PROTOCOL_IN) == 1 && 3057 scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, 3058 SECURITY_PROTOCOL_OUT) == 1) 3059 sdkp->security = 1; 3060 } 3061 3062 /** 3063 * sd_revalidate_disk - called the first time a new disk is seen, 3064 * performs disk spin up, read_capacity, etc. 3065 * @disk: struct gendisk we care about 3066 **/ 3067 static int sd_revalidate_disk(struct gendisk *disk) 3068 { 3069 struct scsi_disk *sdkp = scsi_disk(disk); 3070 struct scsi_device *sdp = sdkp->device; 3071 struct request_queue *q = sdkp->disk->queue; 3072 sector_t old_capacity = sdkp->capacity; 3073 unsigned char *buffer; 3074 unsigned int dev_max, rw_max; 3075 3076 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 3077 "sd_revalidate_disk\n")); 3078 3079 /* 3080 * If the device is offline, don't try and read capacity or any 3081 * of the other niceties. 3082 */ 3083 if (!scsi_device_online(sdp)) 3084 goto out; 3085 3086 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 3087 if (!buffer) { 3088 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 3089 "allocation failure.\n"); 3090 goto out; 3091 } 3092 3093 sd_spinup_disk(sdkp); 3094 3095 /* 3096 * Without media there is no reason to ask; moreover, some devices 3097 * react badly if we do. 3098 */ 3099 if (sdkp->media_present) { 3100 sd_read_capacity(sdkp, buffer); 3101 3102 if (scsi_device_supports_vpd(sdp)) { 3103 sd_read_block_provisioning(sdkp); 3104 sd_read_block_limits(sdkp); 3105 sd_read_block_characteristics(sdkp); 3106 sd_zbc_read_zones(sdkp, buffer); 3107 } 3108 3109 sd_print_capacity(sdkp, old_capacity); 3110 3111 sd_read_write_protect_flag(sdkp, buffer); 3112 sd_read_cache_type(sdkp, buffer); 3113 sd_read_app_tag_own(sdkp, buffer); 3114 sd_read_write_same(sdkp, buffer); 3115 sd_read_security(sdkp, buffer); 3116 } 3117 3118 /* 3119 * We now have all cache related info, determine how we deal 3120 * with flush requests. 3121 */ 3122 sd_set_flush_flag(sdkp); 3123 3124 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */ 3125 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS; 3126 3127 /* Some devices report a maximum block count for READ/WRITE requests. */ 3128 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks); 3129 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max); 3130 3131 /* 3132 * Determine the device's preferred I/O size for reads and writes 3133 * unless the reported value is unreasonably small, large, or 3134 * garbage. 3135 */ 3136 if (sdkp->opt_xfer_blocks && 3137 sdkp->opt_xfer_blocks <= dev_max && 3138 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS && 3139 logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) { 3140 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks); 3141 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks); 3142 } else 3143 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max), 3144 (sector_t)BLK_DEF_MAX_SECTORS); 3145 3146 /* Do not exceed controller limit */ 3147 rw_max = min(rw_max, queue_max_hw_sectors(q)); 3148 3149 /* 3150 * Only update max_sectors if previously unset or if the current value 3151 * exceeds the capabilities of the hardware. 3152 */ 3153 if (sdkp->first_scan || 3154 q->limits.max_sectors > q->limits.max_dev_sectors || 3155 q->limits.max_sectors > q->limits.max_hw_sectors) 3156 q->limits.max_sectors = rw_max; 3157 3158 sdkp->first_scan = 0; 3159 3160 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity)); 3161 sd_config_write_same(sdkp); 3162 kfree(buffer); 3163 3164 out: 3165 return 0; 3166 } 3167 3168 /** 3169 * sd_unlock_native_capacity - unlock native capacity 3170 * @disk: struct gendisk to set capacity for 3171 * 3172 * Block layer calls this function if it detects that partitions 3173 * on @disk reach beyond the end of the device. If the SCSI host 3174 * implements ->unlock_native_capacity() method, it's invoked to 3175 * give it a chance to adjust the device capacity. 3176 * 3177 * CONTEXT: 3178 * Defined by block layer. Might sleep. 3179 */ 3180 static void sd_unlock_native_capacity(struct gendisk *disk) 3181 { 3182 struct scsi_device *sdev = scsi_disk(disk)->device; 3183 3184 if (sdev->host->hostt->unlock_native_capacity) 3185 sdev->host->hostt->unlock_native_capacity(sdev); 3186 } 3187 3188 /** 3189 * sd_format_disk_name - format disk name 3190 * @prefix: name prefix - ie. "sd" for SCSI disks 3191 * @index: index of the disk to format name for 3192 * @buf: output buffer 3193 * @buflen: length of the output buffer 3194 * 3195 * SCSI disk names starts at sda. The 26th device is sdz and the 3196 * 27th is sdaa. The last one for two lettered suffix is sdzz 3197 * which is followed by sdaaa. 3198 * 3199 * This is basically 26 base counting with one extra 'nil' entry 3200 * at the beginning from the second digit on and can be 3201 * determined using similar method as 26 base conversion with the 3202 * index shifted -1 after each digit is computed. 3203 * 3204 * CONTEXT: 3205 * Don't care. 3206 * 3207 * RETURNS: 3208 * 0 on success, -errno on failure. 3209 */ 3210 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 3211 { 3212 const int base = 'z' - 'a' + 1; 3213 char *begin = buf + strlen(prefix); 3214 char *end = buf + buflen; 3215 char *p; 3216 int unit; 3217 3218 p = end - 1; 3219 *p = '\0'; 3220 unit = base; 3221 do { 3222 if (p == begin) 3223 return -EINVAL; 3224 *--p = 'a' + (index % unit); 3225 index = (index / unit) - 1; 3226 } while (index >= 0); 3227 3228 memmove(begin, p, end - p); 3229 memcpy(buf, prefix, strlen(prefix)); 3230 3231 return 0; 3232 } 3233 3234 /* 3235 * The asynchronous part of sd_probe 3236 */ 3237 static void sd_probe_async(void *data, async_cookie_t cookie) 3238 { 3239 struct scsi_disk *sdkp = data; 3240 struct scsi_device *sdp; 3241 struct gendisk *gd; 3242 u32 index; 3243 struct device *dev; 3244 3245 sdp = sdkp->device; 3246 gd = sdkp->disk; 3247 index = sdkp->index; 3248 dev = &sdp->sdev_gendev; 3249 3250 gd->major = sd_major((index & 0xf0) >> 4); 3251 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 3252 3253 gd->fops = &sd_fops; 3254 gd->private_data = &sdkp->driver; 3255 gd->queue = sdkp->device->request_queue; 3256 3257 /* defaults, until the device tells us otherwise */ 3258 sdp->sector_size = 512; 3259 sdkp->capacity = 0; 3260 sdkp->media_present = 1; 3261 sdkp->write_prot = 0; 3262 sdkp->cache_override = 0; 3263 sdkp->WCE = 0; 3264 sdkp->RCD = 0; 3265 sdkp->ATO = 0; 3266 sdkp->first_scan = 1; 3267 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; 3268 3269 sd_revalidate_disk(gd); 3270 3271 gd->flags = GENHD_FL_EXT_DEVT; 3272 if (sdp->removable) { 3273 gd->flags |= GENHD_FL_REMOVABLE; 3274 gd->events |= DISK_EVENT_MEDIA_CHANGE; 3275 } 3276 3277 blk_pm_runtime_init(sdp->request_queue, dev); 3278 device_add_disk(dev, gd); 3279 if (sdkp->capacity) 3280 sd_dif_config_host(sdkp); 3281 3282 sd_revalidate_disk(gd); 3283 3284 if (sdkp->security) { 3285 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit); 3286 if (sdkp->opal_dev) 3287 sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n"); 3288 } 3289 3290 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 3291 sdp->removable ? "removable " : ""); 3292 scsi_autopm_put_device(sdp); 3293 put_device(&sdkp->dev); 3294 } 3295 3296 /** 3297 * sd_probe - called during driver initialization and whenever a 3298 * new scsi device is attached to the system. It is called once 3299 * for each scsi device (not just disks) present. 3300 * @dev: pointer to device object 3301 * 3302 * Returns 0 if successful (or not interested in this scsi device 3303 * (e.g. scanner)); 1 when there is an error. 3304 * 3305 * Note: this function is invoked from the scsi mid-level. 3306 * This function sets up the mapping between a given 3307 * <host,channel,id,lun> (found in sdp) and new device name 3308 * (e.g. /dev/sda). More precisely it is the block device major 3309 * and minor number that is chosen here. 3310 * 3311 * Assume sd_probe is not re-entrant (for time being) 3312 * Also think about sd_probe() and sd_remove() running coincidentally. 3313 **/ 3314 static int sd_probe(struct device *dev) 3315 { 3316 struct scsi_device *sdp = to_scsi_device(dev); 3317 struct scsi_disk *sdkp; 3318 struct gendisk *gd; 3319 int index; 3320 int error; 3321 3322 scsi_autopm_get_device(sdp); 3323 error = -ENODEV; 3324 if (sdp->type != TYPE_DISK && 3325 sdp->type != TYPE_ZBC && 3326 sdp->type != TYPE_MOD && 3327 sdp->type != TYPE_RBC) 3328 goto out; 3329 3330 #ifndef CONFIG_BLK_DEV_ZONED 3331 if (sdp->type == TYPE_ZBC) 3332 goto out; 3333 #endif 3334 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 3335 "sd_probe\n")); 3336 3337 error = -ENOMEM; 3338 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 3339 if (!sdkp) 3340 goto out; 3341 3342 gd = alloc_disk(SD_MINORS); 3343 if (!gd) 3344 goto out_free; 3345 3346 index = ida_alloc(&sd_index_ida, GFP_KERNEL); 3347 if (index < 0) { 3348 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); 3349 goto out_put; 3350 } 3351 3352 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 3353 if (error) { 3354 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); 3355 goto out_free_index; 3356 } 3357 3358 sdkp->device = sdp; 3359 sdkp->driver = &sd_template; 3360 sdkp->disk = gd; 3361 sdkp->index = index; 3362 atomic_set(&sdkp->openers, 0); 3363 atomic_set(&sdkp->device->ioerr_cnt, 0); 3364 3365 if (!sdp->request_queue->rq_timeout) { 3366 if (sdp->type != TYPE_MOD) 3367 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 3368 else 3369 blk_queue_rq_timeout(sdp->request_queue, 3370 SD_MOD_TIMEOUT); 3371 } 3372 3373 device_initialize(&sdkp->dev); 3374 sdkp->dev.parent = dev; 3375 sdkp->dev.class = &sd_disk_class; 3376 dev_set_name(&sdkp->dev, "%s", dev_name(dev)); 3377 3378 error = device_add(&sdkp->dev); 3379 if (error) 3380 goto out_free_index; 3381 3382 get_device(dev); 3383 dev_set_drvdata(dev, sdkp); 3384 3385 get_device(&sdkp->dev); /* prevent release before async_schedule */ 3386 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain); 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 async_synchronize_full_domain(&scsi_sd_probe_domain); 3423 device_del(&sdkp->dev); 3424 del_gendisk(sdkp->disk); 3425 sd_shutdown(dev); 3426 3427 sd_zbc_remove(sdkp); 3428 3429 free_opal_dev(sdkp->opal_dev); 3430 3431 blk_register_region(devt, SD_MINORS, NULL, 3432 sd_default_probe, NULL, NULL); 3433 3434 mutex_lock(&sd_ref_mutex); 3435 dev_set_drvdata(dev, NULL); 3436 put_device(&sdkp->dev); 3437 mutex_unlock(&sd_ref_mutex); 3438 3439 return 0; 3440 } 3441 3442 /** 3443 * scsi_disk_release - Called to free the scsi_disk structure 3444 * @dev: pointer to embedded class device 3445 * 3446 * sd_ref_mutex must be held entering this routine. Because it is 3447 * called on last put, you should always use the scsi_disk_get() 3448 * scsi_disk_put() helpers which manipulate the semaphore directly 3449 * and never do a direct put_device. 3450 **/ 3451 static void scsi_disk_release(struct device *dev) 3452 { 3453 struct scsi_disk *sdkp = to_scsi_disk(dev); 3454 struct gendisk *disk = sdkp->disk; 3455 3456 ida_free(&sd_index_ida, sdkp->index); 3457 3458 disk->private_data = NULL; 3459 put_disk(disk); 3460 put_device(&sdkp->device->sdev_gendev); 3461 3462 kfree(sdkp); 3463 } 3464 3465 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 3466 { 3467 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 3468 struct scsi_sense_hdr sshdr; 3469 struct scsi_device *sdp = sdkp->device; 3470 int res; 3471 3472 if (start) 3473 cmd[4] |= 1; /* START */ 3474 3475 if (sdp->start_stop_pwr_cond) 3476 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 3477 3478 if (!scsi_device_online(sdp)) 3479 return -ENODEV; 3480 3481 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr, 3482 SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL); 3483 if (res) { 3484 sd_print_result(sdkp, "Start/Stop Unit failed", res); 3485 if (driver_byte(res) == DRIVER_SENSE) 3486 sd_print_sense_hdr(sdkp, &sshdr); 3487 if (scsi_sense_valid(&sshdr) && 3488 /* 0x3a is medium not present */ 3489 sshdr.asc == 0x3a) 3490 res = 0; 3491 } 3492 3493 /* SCSI error codes must not go to the generic layer */ 3494 if (res) 3495 return -EIO; 3496 3497 return 0; 3498 } 3499 3500 /* 3501 * Send a SYNCHRONIZE CACHE instruction down to the device through 3502 * the normal SCSI command structure. Wait for the command to 3503 * complete. 3504 */ 3505 static void sd_shutdown(struct device *dev) 3506 { 3507 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3508 3509 if (!sdkp) 3510 return; /* this can happen */ 3511 3512 if (pm_runtime_suspended(dev)) 3513 return; 3514 3515 if (sdkp->WCE && sdkp->media_present) { 3516 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3517 sd_sync_cache(sdkp, NULL); 3518 } 3519 3520 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 3521 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3522 sd_start_stop_device(sdkp, 0); 3523 } 3524 } 3525 3526 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors) 3527 { 3528 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3529 struct scsi_sense_hdr sshdr; 3530 int ret = 0; 3531 3532 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */ 3533 return 0; 3534 3535 if (sdkp->WCE && sdkp->media_present) { 3536 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3537 ret = sd_sync_cache(sdkp, &sshdr); 3538 3539 if (ret) { 3540 /* ignore OFFLINE device */ 3541 if (ret == -ENODEV) 3542 return 0; 3543 3544 if (!scsi_sense_valid(&sshdr) || 3545 sshdr.sense_key != ILLEGAL_REQUEST) 3546 return ret; 3547 3548 /* 3549 * sshdr.sense_key == ILLEGAL_REQUEST means this drive 3550 * doesn't support sync. There's not much to do and 3551 * suspend shouldn't fail. 3552 */ 3553 ret = 0; 3554 } 3555 } 3556 3557 if (sdkp->device->manage_start_stop) { 3558 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3559 /* an error is not worth aborting a system sleep */ 3560 ret = sd_start_stop_device(sdkp, 0); 3561 if (ignore_stop_errors) 3562 ret = 0; 3563 } 3564 3565 return ret; 3566 } 3567 3568 static int sd_suspend_system(struct device *dev) 3569 { 3570 return sd_suspend_common(dev, true); 3571 } 3572 3573 static int sd_suspend_runtime(struct device *dev) 3574 { 3575 return sd_suspend_common(dev, false); 3576 } 3577 3578 static int sd_resume(struct device *dev) 3579 { 3580 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3581 int ret; 3582 3583 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */ 3584 return 0; 3585 3586 if (!sdkp->device->manage_start_stop) 3587 return 0; 3588 3589 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 3590 ret = sd_start_stop_device(sdkp, 1); 3591 if (!ret) 3592 opal_unlock_from_suspend(sdkp->opal_dev); 3593 return ret; 3594 } 3595 3596 /** 3597 * init_sd - entry point for this driver (both when built in or when 3598 * a module). 3599 * 3600 * Note: this function registers this driver with the scsi mid-level. 3601 **/ 3602 static int __init init_sd(void) 3603 { 3604 int majors = 0, i, err; 3605 3606 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 3607 3608 for (i = 0; i < SD_MAJORS; i++) { 3609 if (register_blkdev(sd_major(i), "sd") != 0) 3610 continue; 3611 majors++; 3612 blk_register_region(sd_major(i), SD_MINORS, NULL, 3613 sd_default_probe, NULL, NULL); 3614 } 3615 3616 if (!majors) 3617 return -ENODEV; 3618 3619 err = class_register(&sd_disk_class); 3620 if (err) 3621 goto err_out; 3622 3623 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 3624 0, 0, NULL); 3625 if (!sd_cdb_cache) { 3626 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 3627 err = -ENOMEM; 3628 goto err_out_class; 3629 } 3630 3631 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 3632 if (!sd_cdb_pool) { 3633 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 3634 err = -ENOMEM; 3635 goto err_out_cache; 3636 } 3637 3638 err = scsi_register_driver(&sd_template.gendrv); 3639 if (err) 3640 goto err_out_driver; 3641 3642 return 0; 3643 3644 err_out_driver: 3645 mempool_destroy(sd_cdb_pool); 3646 3647 err_out_cache: 3648 kmem_cache_destroy(sd_cdb_cache); 3649 3650 err_out_class: 3651 class_unregister(&sd_disk_class); 3652 err_out: 3653 for (i = 0; i < SD_MAJORS; i++) 3654 unregister_blkdev(sd_major(i), "sd"); 3655 return err; 3656 } 3657 3658 /** 3659 * exit_sd - exit point for this driver (when it is a module). 3660 * 3661 * Note: this function unregisters this driver from the scsi mid-level. 3662 **/ 3663 static void __exit exit_sd(void) 3664 { 3665 int i; 3666 3667 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 3668 3669 scsi_unregister_driver(&sd_template.gendrv); 3670 mempool_destroy(sd_cdb_pool); 3671 kmem_cache_destroy(sd_cdb_cache); 3672 3673 class_unregister(&sd_disk_class); 3674 3675 for (i = 0; i < SD_MAJORS; i++) { 3676 blk_unregister_region(sd_major(i), SD_MINORS); 3677 unregister_blkdev(sd_major(i), "sd"); 3678 } 3679 } 3680 3681 module_init(init_sd); 3682 module_exit(exit_sd); 3683 3684 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 3685 struct scsi_sense_hdr *sshdr) 3686 { 3687 scsi_print_sense_hdr(sdkp->device, 3688 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr); 3689 } 3690 3691 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg, 3692 int result) 3693 { 3694 const char *hb_string = scsi_hostbyte_string(result); 3695 const char *db_string = scsi_driverbyte_string(result); 3696 3697 if (hb_string || db_string) 3698 sd_printk(KERN_INFO, sdkp, 3699 "%s: Result: hostbyte=%s driverbyte=%s\n", msg, 3700 hb_string ? hb_string : "invalid", 3701 db_string ? db_string : "invalid"); 3702 else 3703 sd_printk(KERN_INFO, sdkp, 3704 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n", 3705 msg, host_byte(result), driver_byte(result)); 3706 } 3707 3708