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_SPINLOCK(sd_index_lock); 127 static DEFINE_IDA(sd_index_ida); 128 129 /* This semaphore is used to mediate the 0->1 reference get in the 130 * face of object destruction (i.e. we can't allow a get on an 131 * object after last put) */ 132 static DEFINE_MUTEX(sd_ref_mutex); 133 134 static struct kmem_cache *sd_cdb_cache; 135 static mempool_t *sd_cdb_pool; 136 137 static const char *sd_cache_types[] = { 138 "write through", "none", "write back", 139 "write back, no read (daft)" 140 }; 141 142 static void sd_set_flush_flag(struct scsi_disk *sdkp) 143 { 144 bool wc = false, fua = false; 145 146 if (sdkp->WCE) { 147 wc = true; 148 if (sdkp->DPOFUA) 149 fua = true; 150 } 151 152 blk_queue_write_cache(sdkp->disk->queue, wc, fua); 153 } 154 155 static ssize_t 156 cache_type_store(struct device *dev, struct device_attribute *attr, 157 const char *buf, size_t count) 158 { 159 int ct, rcd, wce, sp; 160 struct scsi_disk *sdkp = to_scsi_disk(dev); 161 struct scsi_device *sdp = sdkp->device; 162 char buffer[64]; 163 char *buffer_data; 164 struct scsi_mode_data data; 165 struct scsi_sense_hdr sshdr; 166 static const char temp[] = "temporary "; 167 int len; 168 169 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 170 /* no cache control on RBC devices; theoretically they 171 * can do it, but there's probably so many exceptions 172 * it's not worth the risk */ 173 return -EINVAL; 174 175 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { 176 buf += sizeof(temp) - 1; 177 sdkp->cache_override = 1; 178 } else { 179 sdkp->cache_override = 0; 180 } 181 182 ct = sysfs_match_string(sd_cache_types, buf); 183 if (ct < 0) 184 return -EINVAL; 185 186 rcd = ct & 0x01 ? 1 : 0; 187 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0; 188 189 if (sdkp->cache_override) { 190 sdkp->WCE = wce; 191 sdkp->RCD = rcd; 192 sd_set_flush_flag(sdkp); 193 return count; 194 } 195 196 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 197 SD_MAX_RETRIES, &data, NULL)) 198 return -EINVAL; 199 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 200 data.block_descriptor_length); 201 buffer_data = buffer + data.header_length + 202 data.block_descriptor_length; 203 buffer_data[2] &= ~0x05; 204 buffer_data[2] |= wce << 2 | rcd; 205 sp = buffer_data[0] & 0x80 ? 1 : 0; 206 buffer_data[0] &= ~0x80; 207 208 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 209 SD_MAX_RETRIES, &data, &sshdr)) { 210 if (scsi_sense_valid(&sshdr)) 211 sd_print_sense_hdr(sdkp, &sshdr); 212 return -EINVAL; 213 } 214 revalidate_disk(sdkp->disk); 215 return count; 216 } 217 218 static ssize_t 219 manage_start_stop_show(struct device *dev, struct device_attribute *attr, 220 char *buf) 221 { 222 struct scsi_disk *sdkp = to_scsi_disk(dev); 223 struct scsi_device *sdp = sdkp->device; 224 225 return sprintf(buf, "%u\n", sdp->manage_start_stop); 226 } 227 228 static ssize_t 229 manage_start_stop_store(struct device *dev, struct device_attribute *attr, 230 const char *buf, size_t count) 231 { 232 struct scsi_disk *sdkp = to_scsi_disk(dev); 233 struct scsi_device *sdp = sdkp->device; 234 235 if (!capable(CAP_SYS_ADMIN)) 236 return -EACCES; 237 238 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 239 240 return count; 241 } 242 static DEVICE_ATTR_RW(manage_start_stop); 243 244 static ssize_t 245 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf) 246 { 247 struct scsi_disk *sdkp = to_scsi_disk(dev); 248 249 return sprintf(buf, "%u\n", sdkp->device->allow_restart); 250 } 251 252 static ssize_t 253 allow_restart_store(struct device *dev, struct device_attribute *attr, 254 const char *buf, size_t count) 255 { 256 struct scsi_disk *sdkp = to_scsi_disk(dev); 257 struct scsi_device *sdp = sdkp->device; 258 259 if (!capable(CAP_SYS_ADMIN)) 260 return -EACCES; 261 262 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 263 return -EINVAL; 264 265 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 266 267 return count; 268 } 269 static DEVICE_ATTR_RW(allow_restart); 270 271 static ssize_t 272 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) 273 { 274 struct scsi_disk *sdkp = to_scsi_disk(dev); 275 int ct = sdkp->RCD + 2*sdkp->WCE; 276 277 return sprintf(buf, "%s\n", sd_cache_types[ct]); 278 } 279 static DEVICE_ATTR_RW(cache_type); 280 281 static ssize_t 282 FUA_show(struct device *dev, struct device_attribute *attr, char *buf) 283 { 284 struct scsi_disk *sdkp = to_scsi_disk(dev); 285 286 return sprintf(buf, "%u\n", sdkp->DPOFUA); 287 } 288 static DEVICE_ATTR_RO(FUA); 289 290 static ssize_t 291 protection_type_show(struct device *dev, struct device_attribute *attr, 292 char *buf) 293 { 294 struct scsi_disk *sdkp = to_scsi_disk(dev); 295 296 return sprintf(buf, "%u\n", sdkp->protection_type); 297 } 298 299 static ssize_t 300 protection_type_store(struct device *dev, struct device_attribute *attr, 301 const char *buf, size_t count) 302 { 303 struct scsi_disk *sdkp = to_scsi_disk(dev); 304 unsigned int val; 305 int err; 306 307 if (!capable(CAP_SYS_ADMIN)) 308 return -EACCES; 309 310 err = kstrtouint(buf, 10, &val); 311 312 if (err) 313 return err; 314 315 if (val <= T10_PI_TYPE3_PROTECTION) 316 sdkp->protection_type = val; 317 318 return count; 319 } 320 static DEVICE_ATTR_RW(protection_type); 321 322 static ssize_t 323 protection_mode_show(struct device *dev, struct device_attribute *attr, 324 char *buf) 325 { 326 struct scsi_disk *sdkp = to_scsi_disk(dev); 327 struct scsi_device *sdp = sdkp->device; 328 unsigned int dif, dix; 329 330 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 331 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); 332 333 if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) { 334 dif = 0; 335 dix = 1; 336 } 337 338 if (!dif && !dix) 339 return sprintf(buf, "none\n"); 340 341 return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif); 342 } 343 static DEVICE_ATTR_RO(protection_mode); 344 345 static ssize_t 346 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf) 347 { 348 struct scsi_disk *sdkp = to_scsi_disk(dev); 349 350 return sprintf(buf, "%u\n", sdkp->ATO); 351 } 352 static DEVICE_ATTR_RO(app_tag_own); 353 354 static ssize_t 355 thin_provisioning_show(struct device *dev, struct device_attribute *attr, 356 char *buf) 357 { 358 struct scsi_disk *sdkp = to_scsi_disk(dev); 359 360 return sprintf(buf, "%u\n", sdkp->lbpme); 361 } 362 static DEVICE_ATTR_RO(thin_provisioning); 363 364 /* sysfs_match_string() requires dense arrays */ 365 static const char *lbp_mode[] = { 366 [SD_LBP_FULL] = "full", 367 [SD_LBP_UNMAP] = "unmap", 368 [SD_LBP_WS16] = "writesame_16", 369 [SD_LBP_WS10] = "writesame_10", 370 [SD_LBP_ZERO] = "writesame_zero", 371 [SD_LBP_DISABLE] = "disabled", 372 }; 373 374 static ssize_t 375 provisioning_mode_show(struct device *dev, struct device_attribute *attr, 376 char *buf) 377 { 378 struct scsi_disk *sdkp = to_scsi_disk(dev); 379 380 return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]); 381 } 382 383 static ssize_t 384 provisioning_mode_store(struct device *dev, struct device_attribute *attr, 385 const char *buf, size_t count) 386 { 387 struct scsi_disk *sdkp = to_scsi_disk(dev); 388 struct scsi_device *sdp = sdkp->device; 389 int mode; 390 391 if (!capable(CAP_SYS_ADMIN)) 392 return -EACCES; 393 394 if (sd_is_zoned(sdkp)) { 395 sd_config_discard(sdkp, SD_LBP_DISABLE); 396 return count; 397 } 398 399 if (sdp->type != TYPE_DISK) 400 return -EINVAL; 401 402 mode = sysfs_match_string(lbp_mode, buf); 403 if (mode < 0) 404 return -EINVAL; 405 406 sd_config_discard(sdkp, mode); 407 408 return count; 409 } 410 static DEVICE_ATTR_RW(provisioning_mode); 411 412 /* sysfs_match_string() requires dense arrays */ 413 static const char *zeroing_mode[] = { 414 [SD_ZERO_WRITE] = "write", 415 [SD_ZERO_WS] = "writesame", 416 [SD_ZERO_WS16_UNMAP] = "writesame_16_unmap", 417 [SD_ZERO_WS10_UNMAP] = "writesame_10_unmap", 418 }; 419 420 static ssize_t 421 zeroing_mode_show(struct device *dev, struct device_attribute *attr, 422 char *buf) 423 { 424 struct scsi_disk *sdkp = to_scsi_disk(dev); 425 426 return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]); 427 } 428 429 static ssize_t 430 zeroing_mode_store(struct device *dev, struct device_attribute *attr, 431 const char *buf, size_t count) 432 { 433 struct scsi_disk *sdkp = to_scsi_disk(dev); 434 int mode; 435 436 if (!capable(CAP_SYS_ADMIN)) 437 return -EACCES; 438 439 mode = sysfs_match_string(zeroing_mode, buf); 440 if (mode < 0) 441 return -EINVAL; 442 443 sdkp->zeroing_mode = mode; 444 445 return count; 446 } 447 static DEVICE_ATTR_RW(zeroing_mode); 448 449 static ssize_t 450 max_medium_access_timeouts_show(struct device *dev, 451 struct device_attribute *attr, char *buf) 452 { 453 struct scsi_disk *sdkp = to_scsi_disk(dev); 454 455 return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts); 456 } 457 458 static ssize_t 459 max_medium_access_timeouts_store(struct device *dev, 460 struct device_attribute *attr, const char *buf, 461 size_t count) 462 { 463 struct scsi_disk *sdkp = to_scsi_disk(dev); 464 int err; 465 466 if (!capable(CAP_SYS_ADMIN)) 467 return -EACCES; 468 469 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); 470 471 return err ? err : count; 472 } 473 static DEVICE_ATTR_RW(max_medium_access_timeouts); 474 475 static ssize_t 476 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr, 477 char *buf) 478 { 479 struct scsi_disk *sdkp = to_scsi_disk(dev); 480 481 return sprintf(buf, "%u\n", sdkp->max_ws_blocks); 482 } 483 484 static ssize_t 485 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr, 486 const char *buf, size_t count) 487 { 488 struct scsi_disk *sdkp = to_scsi_disk(dev); 489 struct scsi_device *sdp = sdkp->device; 490 unsigned long max; 491 int err; 492 493 if (!capable(CAP_SYS_ADMIN)) 494 return -EACCES; 495 496 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 497 return -EINVAL; 498 499 err = kstrtoul(buf, 10, &max); 500 501 if (err) 502 return err; 503 504 if (max == 0) 505 sdp->no_write_same = 1; 506 else if (max <= SD_MAX_WS16_BLOCKS) { 507 sdp->no_write_same = 0; 508 sdkp->max_ws_blocks = max; 509 } 510 511 sd_config_write_same(sdkp); 512 513 return count; 514 } 515 static DEVICE_ATTR_RW(max_write_same_blocks); 516 517 static struct attribute *sd_disk_attrs[] = { 518 &dev_attr_cache_type.attr, 519 &dev_attr_FUA.attr, 520 &dev_attr_allow_restart.attr, 521 &dev_attr_manage_start_stop.attr, 522 &dev_attr_protection_type.attr, 523 &dev_attr_protection_mode.attr, 524 &dev_attr_app_tag_own.attr, 525 &dev_attr_thin_provisioning.attr, 526 &dev_attr_provisioning_mode.attr, 527 &dev_attr_zeroing_mode.attr, 528 &dev_attr_max_write_same_blocks.attr, 529 &dev_attr_max_medium_access_timeouts.attr, 530 NULL, 531 }; 532 ATTRIBUTE_GROUPS(sd_disk); 533 534 static struct class sd_disk_class = { 535 .name = "scsi_disk", 536 .owner = THIS_MODULE, 537 .dev_release = scsi_disk_release, 538 .dev_groups = sd_disk_groups, 539 }; 540 541 static const struct dev_pm_ops sd_pm_ops = { 542 .suspend = sd_suspend_system, 543 .resume = sd_resume, 544 .poweroff = sd_suspend_system, 545 .restore = sd_resume, 546 .runtime_suspend = sd_suspend_runtime, 547 .runtime_resume = sd_resume, 548 }; 549 550 static struct scsi_driver sd_template = { 551 .gendrv = { 552 .name = "sd", 553 .owner = THIS_MODULE, 554 .probe = sd_probe, 555 .remove = sd_remove, 556 .shutdown = sd_shutdown, 557 .pm = &sd_pm_ops, 558 }, 559 .rescan = sd_rescan, 560 .init_command = sd_init_command, 561 .uninit_command = sd_uninit_command, 562 .done = sd_done, 563 .eh_action = sd_eh_action, 564 .eh_reset = sd_eh_reset, 565 }; 566 567 /* 568 * Dummy kobj_map->probe function. 569 * The default ->probe function will call modprobe, which is 570 * pointless as this module is already loaded. 571 */ 572 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data) 573 { 574 return NULL; 575 } 576 577 /* 578 * Device no to disk mapping: 579 * 580 * major disc2 disc p1 581 * |............|.............|....|....| <- dev_t 582 * 31 20 19 8 7 4 3 0 583 * 584 * Inside a major, we have 16k disks, however mapped non- 585 * contiguously. The first 16 disks are for major0, the next 586 * ones with major1, ... Disk 256 is for major0 again, disk 272 587 * for major1, ... 588 * As we stay compatible with our numbering scheme, we can reuse 589 * the well-know SCSI majors 8, 65--71, 136--143. 590 */ 591 static int sd_major(int major_idx) 592 { 593 switch (major_idx) { 594 case 0: 595 return SCSI_DISK0_MAJOR; 596 case 1 ... 7: 597 return SCSI_DISK1_MAJOR + major_idx - 1; 598 case 8 ... 15: 599 return SCSI_DISK8_MAJOR + major_idx - 8; 600 default: 601 BUG(); 602 return 0; /* shut up gcc */ 603 } 604 } 605 606 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 607 { 608 struct scsi_disk *sdkp = NULL; 609 610 mutex_lock(&sd_ref_mutex); 611 612 if (disk->private_data) { 613 sdkp = scsi_disk(disk); 614 if (scsi_device_get(sdkp->device) == 0) 615 get_device(&sdkp->dev); 616 else 617 sdkp = NULL; 618 } 619 mutex_unlock(&sd_ref_mutex); 620 return sdkp; 621 } 622 623 static void scsi_disk_put(struct scsi_disk *sdkp) 624 { 625 struct scsi_device *sdev = sdkp->device; 626 627 mutex_lock(&sd_ref_mutex); 628 put_device(&sdkp->dev); 629 scsi_device_put(sdev); 630 mutex_unlock(&sd_ref_mutex); 631 } 632 633 #ifdef CONFIG_BLK_SED_OPAL 634 static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, 635 size_t len, bool send) 636 { 637 struct scsi_device *sdev = data; 638 u8 cdb[12] = { 0, }; 639 int ret; 640 641 cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN; 642 cdb[1] = secp; 643 put_unaligned_be16(spsp, &cdb[2]); 644 put_unaligned_be32(len, &cdb[6]); 645 646 ret = scsi_execute_req(sdev, cdb, 647 send ? DMA_TO_DEVICE : DMA_FROM_DEVICE, 648 buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL); 649 return ret <= 0 ? ret : -EIO; 650 } 651 #endif /* CONFIG_BLK_SED_OPAL */ 652 653 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd, 654 unsigned int dix, unsigned int dif) 655 { 656 struct bio *bio = scmd->request->bio; 657 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif); 658 unsigned int protect = 0; 659 660 if (dix) { /* DIX Type 0, 1, 2, 3 */ 661 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM)) 662 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM; 663 664 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 665 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK; 666 } 667 668 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */ 669 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT; 670 671 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 672 scmd->prot_flags |= SCSI_PROT_REF_CHECK; 673 } 674 675 if (dif) { /* DIX/DIF Type 1, 2, 3 */ 676 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI; 677 678 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK)) 679 protect = 3 << 5; /* Disable target PI checking */ 680 else 681 protect = 1 << 5; /* Enable target PI checking */ 682 } 683 684 scsi_set_prot_op(scmd, prot_op); 685 scsi_set_prot_type(scmd, dif); 686 scmd->prot_flags &= sd_prot_flag_mask(prot_op); 687 688 return protect; 689 } 690 691 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) 692 { 693 struct request_queue *q = sdkp->disk->queue; 694 unsigned int logical_block_size = sdkp->device->sector_size; 695 unsigned int max_blocks = 0; 696 697 q->limits.discard_alignment = 698 sdkp->unmap_alignment * logical_block_size; 699 q->limits.discard_granularity = 700 max(sdkp->physical_block_size, 701 sdkp->unmap_granularity * logical_block_size); 702 sdkp->provisioning_mode = mode; 703 704 switch (mode) { 705 706 case SD_LBP_FULL: 707 case SD_LBP_DISABLE: 708 blk_queue_max_discard_sectors(q, 0); 709 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); 710 return; 711 712 case SD_LBP_UNMAP: 713 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 714 (u32)SD_MAX_WS16_BLOCKS); 715 break; 716 717 case SD_LBP_WS16: 718 if (sdkp->device->unmap_limit_for_ws) 719 max_blocks = sdkp->max_unmap_blocks; 720 else 721 max_blocks = sdkp->max_ws_blocks; 722 723 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS); 724 break; 725 726 case SD_LBP_WS10: 727 if (sdkp->device->unmap_limit_for_ws) 728 max_blocks = sdkp->max_unmap_blocks; 729 else 730 max_blocks = sdkp->max_ws_blocks; 731 732 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS); 733 break; 734 735 case SD_LBP_ZERO: 736 max_blocks = min_not_zero(sdkp->max_ws_blocks, 737 (u32)SD_MAX_WS10_BLOCKS); 738 break; 739 } 740 741 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9)); 742 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 743 } 744 745 static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd) 746 { 747 struct scsi_device *sdp = cmd->device; 748 struct request *rq = cmd->request; 749 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); 750 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); 751 unsigned int data_len = 24; 752 char *buf; 753 754 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 755 if (!rq->special_vec.bv_page) 756 return BLKPREP_DEFER; 757 rq->special_vec.bv_offset = 0; 758 rq->special_vec.bv_len = data_len; 759 rq->rq_flags |= RQF_SPECIAL_PAYLOAD; 760 761 cmd->cmd_len = 10; 762 cmd->cmnd[0] = UNMAP; 763 cmd->cmnd[8] = 24; 764 765 buf = page_address(rq->special_vec.bv_page); 766 put_unaligned_be16(6 + 16, &buf[0]); 767 put_unaligned_be16(16, &buf[2]); 768 put_unaligned_be64(sector, &buf[8]); 769 put_unaligned_be32(nr_sectors, &buf[16]); 770 771 cmd->allowed = SD_MAX_RETRIES; 772 cmd->transfersize = data_len; 773 rq->timeout = SD_TIMEOUT; 774 scsi_req(rq)->resid_len = data_len; 775 776 return scsi_init_io(cmd); 777 } 778 779 static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap) 780 { 781 struct scsi_device *sdp = cmd->device; 782 struct request *rq = cmd->request; 783 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); 784 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); 785 u32 data_len = sdp->sector_size; 786 787 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 788 if (!rq->special_vec.bv_page) 789 return BLKPREP_DEFER; 790 rq->special_vec.bv_offset = 0; 791 rq->special_vec.bv_len = data_len; 792 rq->rq_flags |= RQF_SPECIAL_PAYLOAD; 793 794 cmd->cmd_len = 16; 795 cmd->cmnd[0] = WRITE_SAME_16; 796 if (unmap) 797 cmd->cmnd[1] = 0x8; /* UNMAP */ 798 put_unaligned_be64(sector, &cmd->cmnd[2]); 799 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); 800 801 cmd->allowed = SD_MAX_RETRIES; 802 cmd->transfersize = data_len; 803 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT; 804 scsi_req(rq)->resid_len = data_len; 805 806 return scsi_init_io(cmd); 807 } 808 809 static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap) 810 { 811 struct scsi_device *sdp = cmd->device; 812 struct request *rq = cmd->request; 813 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); 814 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); 815 u32 data_len = sdp->sector_size; 816 817 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 818 if (!rq->special_vec.bv_page) 819 return BLKPREP_DEFER; 820 rq->special_vec.bv_offset = 0; 821 rq->special_vec.bv_len = data_len; 822 rq->rq_flags |= RQF_SPECIAL_PAYLOAD; 823 824 cmd->cmd_len = 10; 825 cmd->cmnd[0] = WRITE_SAME; 826 if (unmap) 827 cmd->cmnd[1] = 0x8; /* UNMAP */ 828 put_unaligned_be32(sector, &cmd->cmnd[2]); 829 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); 830 831 cmd->allowed = SD_MAX_RETRIES; 832 cmd->transfersize = data_len; 833 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT; 834 scsi_req(rq)->resid_len = data_len; 835 836 return scsi_init_io(cmd); 837 } 838 839 static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd) 840 { 841 struct request *rq = cmd->request; 842 struct scsi_device *sdp = cmd->device; 843 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 844 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9); 845 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9); 846 int ret; 847 848 if (!(rq->cmd_flags & REQ_NOUNMAP)) { 849 switch (sdkp->zeroing_mode) { 850 case SD_ZERO_WS16_UNMAP: 851 ret = sd_setup_write_same16_cmnd(cmd, true); 852 goto out; 853 case SD_ZERO_WS10_UNMAP: 854 ret = sd_setup_write_same10_cmnd(cmd, true); 855 goto out; 856 } 857 } 858 859 if (sdp->no_write_same) 860 return BLKPREP_INVALID; 861 862 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) 863 ret = sd_setup_write_same16_cmnd(cmd, false); 864 else 865 ret = sd_setup_write_same10_cmnd(cmd, false); 866 867 out: 868 if (sd_is_zoned(sdkp) && ret == BLKPREP_OK) 869 return sd_zbc_write_lock_zone(cmd); 870 871 return ret; 872 } 873 874 static void sd_config_write_same(struct scsi_disk *sdkp) 875 { 876 struct request_queue *q = sdkp->disk->queue; 877 unsigned int logical_block_size = sdkp->device->sector_size; 878 879 if (sdkp->device->no_write_same) { 880 sdkp->max_ws_blocks = 0; 881 goto out; 882 } 883 884 /* Some devices can not handle block counts above 0xffff despite 885 * supporting WRITE SAME(16). Consequently we default to 64k 886 * blocks per I/O unless the device explicitly advertises a 887 * bigger limit. 888 */ 889 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) 890 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 891 (u32)SD_MAX_WS16_BLOCKS); 892 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes) 893 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 894 (u32)SD_MAX_WS10_BLOCKS); 895 else { 896 sdkp->device->no_write_same = 1; 897 sdkp->max_ws_blocks = 0; 898 } 899 900 if (sdkp->lbprz && sdkp->lbpws) 901 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP; 902 else if (sdkp->lbprz && sdkp->lbpws10) 903 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP; 904 else if (sdkp->max_ws_blocks) 905 sdkp->zeroing_mode = SD_ZERO_WS; 906 else 907 sdkp->zeroing_mode = SD_ZERO_WRITE; 908 909 out: 910 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks * 911 (logical_block_size >> 9)); 912 blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks * 913 (logical_block_size >> 9)); 914 } 915 916 /** 917 * sd_setup_write_same_cmnd - write the same data to multiple blocks 918 * @cmd: command to prepare 919 * 920 * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on 921 * the preference indicated by the target device. 922 **/ 923 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd) 924 { 925 struct request *rq = cmd->request; 926 struct scsi_device *sdp = cmd->device; 927 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 928 struct bio *bio = rq->bio; 929 sector_t sector = blk_rq_pos(rq); 930 unsigned int nr_sectors = blk_rq_sectors(rq); 931 unsigned int nr_bytes = blk_rq_bytes(rq); 932 int ret; 933 934 if (sdkp->device->no_write_same) 935 return BLKPREP_INVALID; 936 937 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size); 938 939 if (sd_is_zoned(sdkp)) { 940 ret = sd_zbc_write_lock_zone(cmd); 941 if (ret != BLKPREP_OK) 942 return ret; 943 } 944 945 sector >>= ilog2(sdp->sector_size) - 9; 946 nr_sectors >>= ilog2(sdp->sector_size) - 9; 947 948 rq->timeout = SD_WRITE_SAME_TIMEOUT; 949 950 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) { 951 cmd->cmd_len = 16; 952 cmd->cmnd[0] = WRITE_SAME_16; 953 put_unaligned_be64(sector, &cmd->cmnd[2]); 954 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); 955 } else { 956 cmd->cmd_len = 10; 957 cmd->cmnd[0] = WRITE_SAME; 958 put_unaligned_be32(sector, &cmd->cmnd[2]); 959 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); 960 } 961 962 cmd->transfersize = sdp->sector_size; 963 cmd->allowed = SD_MAX_RETRIES; 964 965 /* 966 * For WRITE SAME the data transferred via the DATA OUT buffer is 967 * different from the amount of data actually written to the target. 968 * 969 * We set up __data_len to the amount of data transferred via the 970 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list 971 * to transfer a single sector of data first, but then reset it to 972 * the amount of data to be written right after so that the I/O path 973 * knows how much to actually write. 974 */ 975 rq->__data_len = sdp->sector_size; 976 ret = scsi_init_io(cmd); 977 rq->__data_len = nr_bytes; 978 979 if (sd_is_zoned(sdkp) && ret != BLKPREP_OK) 980 sd_zbc_write_unlock_zone(cmd); 981 982 return ret; 983 } 984 985 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd) 986 { 987 struct request *rq = cmd->request; 988 989 /* flush requests don't perform I/O, zero the S/G table */ 990 memset(&cmd->sdb, 0, sizeof(cmd->sdb)); 991 992 cmd->cmnd[0] = SYNCHRONIZE_CACHE; 993 cmd->cmd_len = 10; 994 cmd->transfersize = 0; 995 cmd->allowed = SD_MAX_RETRIES; 996 997 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER; 998 return BLKPREP_OK; 999 } 1000 1001 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt) 1002 { 1003 struct request *rq = SCpnt->request; 1004 struct scsi_device *sdp = SCpnt->device; 1005 struct gendisk *disk = rq->rq_disk; 1006 struct scsi_disk *sdkp = scsi_disk(disk); 1007 sector_t block = blk_rq_pos(rq); 1008 sector_t threshold; 1009 unsigned int this_count = blk_rq_sectors(rq); 1010 unsigned int dif, dix; 1011 bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE; 1012 int ret; 1013 unsigned char protect; 1014 1015 if (zoned_write) { 1016 ret = sd_zbc_write_lock_zone(SCpnt); 1017 if (ret != BLKPREP_OK) 1018 return ret; 1019 } 1020 1021 ret = scsi_init_io(SCpnt); 1022 if (ret != BLKPREP_OK) 1023 goto out; 1024 WARN_ON_ONCE(SCpnt != rq->special); 1025 1026 /* from here on until we're complete, any goto out 1027 * is used for a killable error condition */ 1028 ret = BLKPREP_KILL; 1029 1030 SCSI_LOG_HLQUEUE(1, 1031 scmd_printk(KERN_INFO, SCpnt, 1032 "%s: block=%llu, count=%d\n", 1033 __func__, (unsigned long long)block, this_count)); 1034 1035 if (!sdp || !scsi_device_online(sdp) || 1036 block + blk_rq_sectors(rq) > get_capacity(disk)) { 1037 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 1038 "Finishing %u sectors\n", 1039 blk_rq_sectors(rq))); 1040 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 1041 "Retry with 0x%p\n", SCpnt)); 1042 goto out; 1043 } 1044 1045 if (sdp->changed) { 1046 /* 1047 * quietly refuse to do anything to a changed disc until 1048 * the changed bit has been reset 1049 */ 1050 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ 1051 goto out; 1052 } 1053 1054 /* 1055 * Some SD card readers can't handle multi-sector accesses which touch 1056 * the last one or two hardware sectors. Split accesses as needed. 1057 */ 1058 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 1059 (sdp->sector_size / 512); 1060 1061 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 1062 if (block < threshold) { 1063 /* Access up to the threshold but not beyond */ 1064 this_count = threshold - block; 1065 } else { 1066 /* Access only a single hardware sector */ 1067 this_count = sdp->sector_size / 512; 1068 } 1069 } 1070 1071 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 1072 (unsigned long long)block)); 1073 1074 /* 1075 * If we have a 1K hardware sectorsize, prevent access to single 1076 * 512 byte sectors. In theory we could handle this - in fact 1077 * the scsi cdrom driver must be able to handle this because 1078 * we typically use 1K blocksizes, and cdroms typically have 1079 * 2K hardware sectorsizes. Of course, things are simpler 1080 * with the cdrom, since it is read-only. For performance 1081 * reasons, the filesystems should be able to handle this 1082 * and not force the scsi disk driver to use bounce buffers 1083 * for this. 1084 */ 1085 if (sdp->sector_size == 1024) { 1086 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 1087 scmd_printk(KERN_ERR, SCpnt, 1088 "Bad block number requested\n"); 1089 goto out; 1090 } else { 1091 block = block >> 1; 1092 this_count = this_count >> 1; 1093 } 1094 } 1095 if (sdp->sector_size == 2048) { 1096 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 1097 scmd_printk(KERN_ERR, SCpnt, 1098 "Bad block number requested\n"); 1099 goto out; 1100 } else { 1101 block = block >> 2; 1102 this_count = this_count >> 2; 1103 } 1104 } 1105 if (sdp->sector_size == 4096) { 1106 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 1107 scmd_printk(KERN_ERR, SCpnt, 1108 "Bad block number requested\n"); 1109 goto out; 1110 } else { 1111 block = block >> 3; 1112 this_count = this_count >> 3; 1113 } 1114 } 1115 if (rq_data_dir(rq) == WRITE) { 1116 SCpnt->cmnd[0] = WRITE_6; 1117 1118 if (blk_integrity_rq(rq)) 1119 sd_dif_prepare(SCpnt); 1120 1121 } else if (rq_data_dir(rq) == READ) { 1122 SCpnt->cmnd[0] = READ_6; 1123 } else { 1124 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq)); 1125 goto out; 1126 } 1127 1128 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 1129 "%s %d/%u 512 byte blocks.\n", 1130 (rq_data_dir(rq) == WRITE) ? 1131 "writing" : "reading", this_count, 1132 blk_rq_sectors(rq))); 1133 1134 dix = scsi_prot_sg_count(SCpnt); 1135 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type); 1136 1137 if (dif || dix) 1138 protect = sd_setup_protect_cmnd(SCpnt, dix, dif); 1139 else 1140 protect = 0; 1141 1142 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) { 1143 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 1144 1145 if (unlikely(SCpnt->cmnd == NULL)) { 1146 ret = BLKPREP_DEFER; 1147 goto out; 1148 } 1149 1150 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 1151 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 1152 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 1153 SCpnt->cmnd[7] = 0x18; 1154 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 1155 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1156 1157 /* LBA */ 1158 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1159 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1160 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1161 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1162 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 1163 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 1164 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 1165 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 1166 1167 /* Expected Indirect LBA */ 1168 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 1169 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 1170 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 1171 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 1172 1173 /* Transfer length */ 1174 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 1175 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 1176 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 1177 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 1178 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) { 1179 SCpnt->cmnd[0] += READ_16 - READ_6; 1180 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1181 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1182 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1183 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1184 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1185 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 1186 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 1187 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 1188 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 1189 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 1190 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 1191 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 1192 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 1193 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 1194 } else if ((this_count > 0xff) || (block > 0x1fffff) || 1195 scsi_device_protection(SCpnt->device) || 1196 SCpnt->device->use_10_for_rw) { 1197 SCpnt->cmnd[0] += READ_10 - READ_6; 1198 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1199 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 1200 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 1201 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 1202 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 1203 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 1204 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 1205 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 1206 } else { 1207 if (unlikely(rq->cmd_flags & REQ_FUA)) { 1208 /* 1209 * This happens only if this drive failed 1210 * 10byte rw command with ILLEGAL_REQUEST 1211 * during operation and thus turned off 1212 * use_10_for_rw. 1213 */ 1214 scmd_printk(KERN_ERR, SCpnt, 1215 "FUA write on READ/WRITE(6) drive\n"); 1216 goto out; 1217 } 1218 1219 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 1220 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 1221 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 1222 SCpnt->cmnd[4] = (unsigned char) this_count; 1223 SCpnt->cmnd[5] = 0; 1224 } 1225 SCpnt->sdb.length = this_count * sdp->sector_size; 1226 1227 /* 1228 * We shouldn't disconnect in the middle of a sector, so with a dumb 1229 * host adapter, it's safe to assume that we can at least transfer 1230 * this many bytes between each connect / disconnect. 1231 */ 1232 SCpnt->transfersize = sdp->sector_size; 1233 SCpnt->underflow = this_count << 9; 1234 SCpnt->allowed = SD_MAX_RETRIES; 1235 1236 /* 1237 * This indicates that the command is ready from our end to be 1238 * queued. 1239 */ 1240 ret = BLKPREP_OK; 1241 out: 1242 if (zoned_write && ret != BLKPREP_OK) 1243 sd_zbc_write_unlock_zone(SCpnt); 1244 1245 return ret; 1246 } 1247 1248 static int sd_init_command(struct scsi_cmnd *cmd) 1249 { 1250 struct request *rq = cmd->request; 1251 1252 switch (req_op(rq)) { 1253 case REQ_OP_DISCARD: 1254 switch (scsi_disk(rq->rq_disk)->provisioning_mode) { 1255 case SD_LBP_UNMAP: 1256 return sd_setup_unmap_cmnd(cmd); 1257 case SD_LBP_WS16: 1258 return sd_setup_write_same16_cmnd(cmd, true); 1259 case SD_LBP_WS10: 1260 return sd_setup_write_same10_cmnd(cmd, true); 1261 case SD_LBP_ZERO: 1262 return sd_setup_write_same10_cmnd(cmd, false); 1263 default: 1264 return BLKPREP_INVALID; 1265 } 1266 case REQ_OP_WRITE_ZEROES: 1267 return sd_setup_write_zeroes_cmnd(cmd); 1268 case REQ_OP_WRITE_SAME: 1269 return sd_setup_write_same_cmnd(cmd); 1270 case REQ_OP_FLUSH: 1271 return sd_setup_flush_cmnd(cmd); 1272 case REQ_OP_READ: 1273 case REQ_OP_WRITE: 1274 return sd_setup_read_write_cmnd(cmd); 1275 case REQ_OP_ZONE_REPORT: 1276 return sd_zbc_setup_report_cmnd(cmd); 1277 case REQ_OP_ZONE_RESET: 1278 return sd_zbc_setup_reset_cmnd(cmd); 1279 default: 1280 BUG(); 1281 } 1282 } 1283 1284 static void sd_uninit_command(struct scsi_cmnd *SCpnt) 1285 { 1286 struct request *rq = SCpnt->request; 1287 1288 if (SCpnt->flags & SCMD_ZONE_WRITE_LOCK) 1289 sd_zbc_write_unlock_zone(SCpnt); 1290 1291 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1292 __free_page(rq->special_vec.bv_page); 1293 1294 if (SCpnt->cmnd != scsi_req(rq)->cmd) { 1295 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1296 SCpnt->cmnd = NULL; 1297 SCpnt->cmd_len = 0; 1298 } 1299 } 1300 1301 /** 1302 * sd_open - open a scsi disk device 1303 * @bdev: Block device of the scsi disk to open 1304 * @mode: FMODE_* mask 1305 * 1306 * Returns 0 if successful. Returns a negated errno value in case 1307 * of error. 1308 * 1309 * Note: This can be called from a user context (e.g. fsck(1) ) 1310 * or from within the kernel (e.g. as a result of a mount(1) ). 1311 * In the latter case @inode and @filp carry an abridged amount 1312 * of information as noted above. 1313 * 1314 * Locking: called with bdev->bd_mutex held. 1315 **/ 1316 static int sd_open(struct block_device *bdev, fmode_t mode) 1317 { 1318 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 1319 struct scsi_device *sdev; 1320 int retval; 1321 1322 if (!sdkp) 1323 return -ENXIO; 1324 1325 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 1326 1327 sdev = sdkp->device; 1328 1329 /* 1330 * If the device is in error recovery, wait until it is done. 1331 * If the device is offline, then disallow any access to it. 1332 */ 1333 retval = -ENXIO; 1334 if (!scsi_block_when_processing_errors(sdev)) 1335 goto error_out; 1336 1337 if (sdev->removable || sdkp->write_prot) 1338 check_disk_change(bdev); 1339 1340 /* 1341 * If the drive is empty, just let the open fail. 1342 */ 1343 retval = -ENOMEDIUM; 1344 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 1345 goto error_out; 1346 1347 /* 1348 * If the device has the write protect tab set, have the open fail 1349 * if the user expects to be able to write to the thing. 1350 */ 1351 retval = -EROFS; 1352 if (sdkp->write_prot && (mode & FMODE_WRITE)) 1353 goto error_out; 1354 1355 /* 1356 * It is possible that the disk changing stuff resulted in 1357 * the device being taken offline. If this is the case, 1358 * report this to the user, and don't pretend that the 1359 * open actually succeeded. 1360 */ 1361 retval = -ENXIO; 1362 if (!scsi_device_online(sdev)) 1363 goto error_out; 1364 1365 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 1366 if (scsi_block_when_processing_errors(sdev)) 1367 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 1368 } 1369 1370 return 0; 1371 1372 error_out: 1373 scsi_disk_put(sdkp); 1374 return retval; 1375 } 1376 1377 /** 1378 * sd_release - invoked when the (last) close(2) is called on this 1379 * scsi disk. 1380 * @disk: disk to release 1381 * @mode: FMODE_* mask 1382 * 1383 * Returns 0. 1384 * 1385 * Note: may block (uninterruptible) if error recovery is underway 1386 * on this disk. 1387 * 1388 * Locking: called with bdev->bd_mutex held. 1389 **/ 1390 static void sd_release(struct gendisk *disk, fmode_t mode) 1391 { 1392 struct scsi_disk *sdkp = scsi_disk(disk); 1393 struct scsi_device *sdev = sdkp->device; 1394 1395 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 1396 1397 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 1398 if (scsi_block_when_processing_errors(sdev)) 1399 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 1400 } 1401 1402 /* 1403 * XXX and what if there are packets in flight and this close() 1404 * XXX is followed by a "rmmod sd_mod"? 1405 */ 1406 1407 scsi_disk_put(sdkp); 1408 } 1409 1410 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1411 { 1412 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 1413 struct scsi_device *sdp = sdkp->device; 1414 struct Scsi_Host *host = sdp->host; 1415 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity); 1416 int diskinfo[4]; 1417 1418 /* default to most commonly used values */ 1419 diskinfo[0] = 0x40; /* 1 << 6 */ 1420 diskinfo[1] = 0x20; /* 1 << 5 */ 1421 diskinfo[2] = capacity >> 11; 1422 1423 /* override with calculated, extended default, or driver values */ 1424 if (host->hostt->bios_param) 1425 host->hostt->bios_param(sdp, bdev, capacity, diskinfo); 1426 else 1427 scsicam_bios_param(bdev, capacity, diskinfo); 1428 1429 geo->heads = diskinfo[0]; 1430 geo->sectors = diskinfo[1]; 1431 geo->cylinders = diskinfo[2]; 1432 return 0; 1433 } 1434 1435 /** 1436 * sd_ioctl - process an ioctl 1437 * @bdev: target block device 1438 * @mode: FMODE_* mask 1439 * @cmd: ioctl command number 1440 * @arg: this is third argument given to ioctl(2) system call. 1441 * Often contains a pointer. 1442 * 1443 * Returns 0 if successful (some ioctls return positive numbers on 1444 * success as well). Returns a negated errno value in case of error. 1445 * 1446 * Note: most ioctls are forward onto the block subsystem or further 1447 * down in the scsi subsystem. 1448 **/ 1449 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 1450 unsigned int cmd, unsigned long arg) 1451 { 1452 struct gendisk *disk = bdev->bd_disk; 1453 struct scsi_disk *sdkp = scsi_disk(disk); 1454 struct scsi_device *sdp = sdkp->device; 1455 void __user *p = (void __user *)arg; 1456 int error; 1457 1458 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " 1459 "cmd=0x%x\n", disk->disk_name, cmd)); 1460 1461 error = scsi_verify_blk_ioctl(bdev, cmd); 1462 if (error < 0) 1463 return error; 1464 1465 /* 1466 * If we are in the middle of error recovery, don't let anyone 1467 * else try and use this device. Also, if error recovery fails, it 1468 * may try and take the device offline, in which case all further 1469 * access to the device is prohibited. 1470 */ 1471 error = scsi_ioctl_block_when_processing_errors(sdp, cmd, 1472 (mode & FMODE_NDELAY) != 0); 1473 if (error) 1474 goto out; 1475 1476 if (is_sed_ioctl(cmd)) 1477 return sed_ioctl(sdkp->opal_dev, cmd, p); 1478 1479 /* 1480 * Send SCSI addressing ioctls directly to mid level, send other 1481 * ioctls to block level and then onto mid level if they can't be 1482 * resolved. 1483 */ 1484 switch (cmd) { 1485 case SCSI_IOCTL_GET_IDLUN: 1486 case SCSI_IOCTL_GET_BUS_NUMBER: 1487 error = scsi_ioctl(sdp, cmd, p); 1488 break; 1489 default: 1490 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); 1491 if (error != -ENOTTY) 1492 break; 1493 error = scsi_ioctl(sdp, cmd, p); 1494 break; 1495 } 1496 out: 1497 return error; 1498 } 1499 1500 static void set_media_not_present(struct scsi_disk *sdkp) 1501 { 1502 if (sdkp->media_present) 1503 sdkp->device->changed = 1; 1504 1505 if (sdkp->device->removable) { 1506 sdkp->media_present = 0; 1507 sdkp->capacity = 0; 1508 } 1509 } 1510 1511 static int media_not_present(struct scsi_disk *sdkp, 1512 struct scsi_sense_hdr *sshdr) 1513 { 1514 if (!scsi_sense_valid(sshdr)) 1515 return 0; 1516 1517 /* not invoked for commands that could return deferred errors */ 1518 switch (sshdr->sense_key) { 1519 case UNIT_ATTENTION: 1520 case NOT_READY: 1521 /* medium not present */ 1522 if (sshdr->asc == 0x3A) { 1523 set_media_not_present(sdkp); 1524 return 1; 1525 } 1526 } 1527 return 0; 1528 } 1529 1530 /** 1531 * sd_check_events - check media events 1532 * @disk: kernel device descriptor 1533 * @clearing: disk events currently being cleared 1534 * 1535 * Returns mask of DISK_EVENT_*. 1536 * 1537 * Note: this function is invoked from the block subsystem. 1538 **/ 1539 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) 1540 { 1541 struct scsi_disk *sdkp = scsi_disk_get(disk); 1542 struct scsi_device *sdp; 1543 int retval; 1544 1545 if (!sdkp) 1546 return 0; 1547 1548 sdp = sdkp->device; 1549 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); 1550 1551 /* 1552 * If the device is offline, don't send any commands - just pretend as 1553 * if the command failed. If the device ever comes back online, we 1554 * can deal with it then. It is only because of unrecoverable errors 1555 * that we would ever take a device offline in the first place. 1556 */ 1557 if (!scsi_device_online(sdp)) { 1558 set_media_not_present(sdkp); 1559 goto out; 1560 } 1561 1562 /* 1563 * Using TEST_UNIT_READY enables differentiation between drive with 1564 * no cartridge loaded - NOT READY, drive with changed cartridge - 1565 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1566 * 1567 * Drives that auto spin down. eg iomega jaz 1G, will be started 1568 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1569 * sd_revalidate() is called. 1570 */ 1571 if (scsi_block_when_processing_errors(sdp)) { 1572 struct scsi_sense_hdr sshdr = { 0, }; 1573 1574 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1575 &sshdr); 1576 1577 /* failed to execute TUR, assume media not present */ 1578 if (host_byte(retval)) { 1579 set_media_not_present(sdkp); 1580 goto out; 1581 } 1582 1583 if (media_not_present(sdkp, &sshdr)) 1584 goto out; 1585 } 1586 1587 /* 1588 * For removable scsi disk we have to recognise the presence 1589 * of a disk in the drive. 1590 */ 1591 if (!sdkp->media_present) 1592 sdp->changed = 1; 1593 sdkp->media_present = 1; 1594 out: 1595 /* 1596 * sdp->changed is set under the following conditions: 1597 * 1598 * Medium present state has changed in either direction. 1599 * Device has indicated UNIT_ATTENTION. 1600 */ 1601 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1602 sdp->changed = 0; 1603 scsi_disk_put(sdkp); 1604 return retval; 1605 } 1606 1607 static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr) 1608 { 1609 int retries, res; 1610 struct scsi_device *sdp = sdkp->device; 1611 const int timeout = sdp->request_queue->rq_timeout 1612 * SD_FLUSH_TIMEOUT_MULTIPLIER; 1613 struct scsi_sense_hdr my_sshdr; 1614 1615 if (!scsi_device_online(sdp)) 1616 return -ENODEV; 1617 1618 /* caller might not be interested in sense, but we need it */ 1619 if (!sshdr) 1620 sshdr = &my_sshdr; 1621 1622 for (retries = 3; retries > 0; --retries) { 1623 unsigned char cmd[10] = { 0 }; 1624 1625 cmd[0] = SYNCHRONIZE_CACHE; 1626 /* 1627 * Leave the rest of the command zero to indicate 1628 * flush everything. 1629 */ 1630 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr, 1631 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL); 1632 if (res == 0) 1633 break; 1634 } 1635 1636 if (res) { 1637 sd_print_result(sdkp, "Synchronize Cache(10) failed", res); 1638 1639 if (driver_byte(res) & DRIVER_SENSE) 1640 sd_print_sense_hdr(sdkp, sshdr); 1641 1642 /* we need to evaluate the error return */ 1643 if (scsi_sense_valid(sshdr) && 1644 (sshdr->asc == 0x3a || /* medium not present */ 1645 sshdr->asc == 0x20)) /* invalid command */ 1646 /* this is no error here */ 1647 return 0; 1648 1649 switch (host_byte(res)) { 1650 /* ignore errors due to racing a disconnection */ 1651 case DID_BAD_TARGET: 1652 case DID_NO_CONNECT: 1653 return 0; 1654 /* signal the upper layer it might try again */ 1655 case DID_BUS_BUSY: 1656 case DID_IMM_RETRY: 1657 case DID_REQUEUE: 1658 case DID_SOFT_ERROR: 1659 return -EBUSY; 1660 default: 1661 return -EIO; 1662 } 1663 } 1664 return 0; 1665 } 1666 1667 static void sd_rescan(struct device *dev) 1668 { 1669 struct scsi_disk *sdkp = dev_get_drvdata(dev); 1670 1671 revalidate_disk(sdkp->disk); 1672 } 1673 1674 1675 #ifdef CONFIG_COMPAT 1676 /* 1677 * This gets directly called from VFS. When the ioctl 1678 * is not recognized we go back to the other translation paths. 1679 */ 1680 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1681 unsigned int cmd, unsigned long arg) 1682 { 1683 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1684 int error; 1685 1686 error = scsi_ioctl_block_when_processing_errors(sdev, cmd, 1687 (mode & FMODE_NDELAY) != 0); 1688 if (error) 1689 return error; 1690 1691 /* 1692 * Let the static ioctl translation table take care of it. 1693 */ 1694 if (!sdev->host->hostt->compat_ioctl) 1695 return -ENOIOCTLCMD; 1696 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1697 } 1698 #endif 1699 1700 static char sd_pr_type(enum pr_type type) 1701 { 1702 switch (type) { 1703 case PR_WRITE_EXCLUSIVE: 1704 return 0x01; 1705 case PR_EXCLUSIVE_ACCESS: 1706 return 0x03; 1707 case PR_WRITE_EXCLUSIVE_REG_ONLY: 1708 return 0x05; 1709 case PR_EXCLUSIVE_ACCESS_REG_ONLY: 1710 return 0x06; 1711 case PR_WRITE_EXCLUSIVE_ALL_REGS: 1712 return 0x07; 1713 case PR_EXCLUSIVE_ACCESS_ALL_REGS: 1714 return 0x08; 1715 default: 1716 return 0; 1717 } 1718 }; 1719 1720 static int sd_pr_command(struct block_device *bdev, u8 sa, 1721 u64 key, u64 sa_key, u8 type, u8 flags) 1722 { 1723 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1724 struct scsi_sense_hdr sshdr; 1725 int result; 1726 u8 cmd[16] = { 0, }; 1727 u8 data[24] = { 0, }; 1728 1729 cmd[0] = PERSISTENT_RESERVE_OUT; 1730 cmd[1] = sa; 1731 cmd[2] = type; 1732 put_unaligned_be32(sizeof(data), &cmd[5]); 1733 1734 put_unaligned_be64(key, &data[0]); 1735 put_unaligned_be64(sa_key, &data[8]); 1736 data[20] = flags; 1737 1738 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data), 1739 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1740 1741 if ((driver_byte(result) & DRIVER_SENSE) && 1742 (scsi_sense_valid(&sshdr))) { 1743 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result); 1744 scsi_print_sense_hdr(sdev, NULL, &sshdr); 1745 } 1746 1747 return result; 1748 } 1749 1750 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, 1751 u32 flags) 1752 { 1753 if (flags & ~PR_FL_IGNORE_KEY) 1754 return -EOPNOTSUPP; 1755 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00, 1756 old_key, new_key, 0, 1757 (1 << 0) /* APTPL */); 1758 } 1759 1760 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, 1761 u32 flags) 1762 { 1763 if (flags) 1764 return -EOPNOTSUPP; 1765 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0); 1766 } 1767 1768 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type) 1769 { 1770 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0); 1771 } 1772 1773 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, 1774 enum pr_type type, bool abort) 1775 { 1776 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key, 1777 sd_pr_type(type), 0); 1778 } 1779 1780 static int sd_pr_clear(struct block_device *bdev, u64 key) 1781 { 1782 return sd_pr_command(bdev, 0x03, key, 0, 0, 0); 1783 } 1784 1785 static const struct pr_ops sd_pr_ops = { 1786 .pr_register = sd_pr_register, 1787 .pr_reserve = sd_pr_reserve, 1788 .pr_release = sd_pr_release, 1789 .pr_preempt = sd_pr_preempt, 1790 .pr_clear = sd_pr_clear, 1791 }; 1792 1793 static const struct block_device_operations sd_fops = { 1794 .owner = THIS_MODULE, 1795 .open = sd_open, 1796 .release = sd_release, 1797 .ioctl = sd_ioctl, 1798 .getgeo = sd_getgeo, 1799 #ifdef CONFIG_COMPAT 1800 .compat_ioctl = sd_compat_ioctl, 1801 #endif 1802 .check_events = sd_check_events, 1803 .revalidate_disk = sd_revalidate_disk, 1804 .unlock_native_capacity = sd_unlock_native_capacity, 1805 .pr_ops = &sd_pr_ops, 1806 }; 1807 1808 /** 1809 * sd_eh_reset - reset error handling callback 1810 * @scmd: sd-issued command that has failed 1811 * 1812 * This function is called by the SCSI midlayer before starting 1813 * SCSI EH. When counting medium access failures we have to be 1814 * careful to register it only only once per device and SCSI EH run; 1815 * there might be several timed out commands which will cause the 1816 * 'max_medium_access_timeouts' counter to trigger after the first 1817 * SCSI EH run already and set the device to offline. 1818 * So this function resets the internal counter before starting SCSI EH. 1819 **/ 1820 static void sd_eh_reset(struct scsi_cmnd *scmd) 1821 { 1822 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1823 1824 /* New SCSI EH run, reset gate variable */ 1825 sdkp->ignore_medium_access_errors = false; 1826 } 1827 1828 /** 1829 * sd_eh_action - error handling callback 1830 * @scmd: sd-issued command that has failed 1831 * @eh_disp: The recovery disposition suggested by the midlayer 1832 * 1833 * This function is called by the SCSI midlayer upon completion of an 1834 * error test command (currently TEST UNIT READY). The result of sending 1835 * the eh command is passed in eh_disp. We're looking for devices that 1836 * fail medium access commands but are OK with non access commands like 1837 * test unit ready (so wrongly see the device as having a successful 1838 * recovery) 1839 **/ 1840 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp) 1841 { 1842 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1843 struct scsi_device *sdev = scmd->device; 1844 1845 if (!scsi_device_online(sdev) || 1846 !scsi_medium_access_command(scmd) || 1847 host_byte(scmd->result) != DID_TIME_OUT || 1848 eh_disp != SUCCESS) 1849 return eh_disp; 1850 1851 /* 1852 * The device has timed out executing a medium access command. 1853 * However, the TEST UNIT READY command sent during error 1854 * handling completed successfully. Either the device is in the 1855 * process of recovering or has it suffered an internal failure 1856 * that prevents access to the storage medium. 1857 */ 1858 if (!sdkp->ignore_medium_access_errors) { 1859 sdkp->medium_access_timed_out++; 1860 sdkp->ignore_medium_access_errors = true; 1861 } 1862 1863 /* 1864 * If the device keeps failing read/write commands but TEST UNIT 1865 * READY always completes successfully we assume that medium 1866 * access is no longer possible and take the device offline. 1867 */ 1868 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { 1869 scmd_printk(KERN_ERR, scmd, 1870 "Medium access timeout failure. Offlining disk!\n"); 1871 mutex_lock(&sdev->state_mutex); 1872 scsi_device_set_state(sdev, SDEV_OFFLINE); 1873 mutex_unlock(&sdev->state_mutex); 1874 1875 return SUCCESS; 1876 } 1877 1878 return eh_disp; 1879 } 1880 1881 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1882 { 1883 struct request *req = scmd->request; 1884 struct scsi_device *sdev = scmd->device; 1885 unsigned int transferred, good_bytes; 1886 u64 start_lba, end_lba, bad_lba; 1887 1888 /* 1889 * Some commands have a payload smaller than the device logical 1890 * block size (e.g. INQUIRY on a 4K disk). 1891 */ 1892 if (scsi_bufflen(scmd) <= sdev->sector_size) 1893 return 0; 1894 1895 /* Check if we have a 'bad_lba' information */ 1896 if (!scsi_get_sense_info_fld(scmd->sense_buffer, 1897 SCSI_SENSE_BUFFERSIZE, 1898 &bad_lba)) 1899 return 0; 1900 1901 /* 1902 * If the bad lba was reported incorrectly, we have no idea where 1903 * the error is. 1904 */ 1905 start_lba = sectors_to_logical(sdev, blk_rq_pos(req)); 1906 end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd)); 1907 if (bad_lba < start_lba || bad_lba >= end_lba) 1908 return 0; 1909 1910 /* 1911 * resid is optional but mostly filled in. When it's unused, 1912 * its value is zero, so we assume the whole buffer transferred 1913 */ 1914 transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 1915 1916 /* This computation should always be done in terms of the 1917 * resolution of the device's medium. 1918 */ 1919 good_bytes = logical_to_bytes(sdev, bad_lba - start_lba); 1920 1921 return min(good_bytes, transferred); 1922 } 1923 1924 /** 1925 * sd_done - bottom half handler: called when the lower level 1926 * driver has completed (successfully or otherwise) a scsi command. 1927 * @SCpnt: mid-level's per command structure. 1928 * 1929 * Note: potentially run from within an ISR. Must not block. 1930 **/ 1931 static int sd_done(struct scsi_cmnd *SCpnt) 1932 { 1933 int result = SCpnt->result; 1934 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1935 unsigned int sector_size = SCpnt->device->sector_size; 1936 unsigned int resid; 1937 struct scsi_sense_hdr sshdr; 1938 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1939 struct request *req = SCpnt->request; 1940 int sense_valid = 0; 1941 int sense_deferred = 0; 1942 1943 switch (req_op(req)) { 1944 case REQ_OP_DISCARD: 1945 case REQ_OP_WRITE_ZEROES: 1946 case REQ_OP_WRITE_SAME: 1947 case REQ_OP_ZONE_RESET: 1948 if (!result) { 1949 good_bytes = blk_rq_bytes(req); 1950 scsi_set_resid(SCpnt, 0); 1951 } else { 1952 good_bytes = 0; 1953 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 1954 } 1955 break; 1956 case REQ_OP_ZONE_REPORT: 1957 if (!result) { 1958 good_bytes = scsi_bufflen(SCpnt) 1959 - scsi_get_resid(SCpnt); 1960 scsi_set_resid(SCpnt, 0); 1961 } else { 1962 good_bytes = 0; 1963 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 1964 } 1965 break; 1966 default: 1967 /* 1968 * In case of bogus fw or device, we could end up having 1969 * an unaligned partial completion. Check this here and force 1970 * alignment. 1971 */ 1972 resid = scsi_get_resid(SCpnt); 1973 if (resid & (sector_size - 1)) { 1974 sd_printk(KERN_INFO, sdkp, 1975 "Unaligned partial completion (resid=%u, sector_sz=%u)\n", 1976 resid, sector_size); 1977 resid = min(scsi_bufflen(SCpnt), 1978 round_up(resid, sector_size)); 1979 scsi_set_resid(SCpnt, resid); 1980 } 1981 } 1982 1983 if (result) { 1984 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1985 if (sense_valid) 1986 sense_deferred = scsi_sense_is_deferred(&sshdr); 1987 } 1988 sdkp->medium_access_timed_out = 0; 1989 1990 if (driver_byte(result) != DRIVER_SENSE && 1991 (!sense_valid || sense_deferred)) 1992 goto out; 1993 1994 switch (sshdr.sense_key) { 1995 case HARDWARE_ERROR: 1996 case MEDIUM_ERROR: 1997 good_bytes = sd_completed_bytes(SCpnt); 1998 break; 1999 case RECOVERED_ERROR: 2000 good_bytes = scsi_bufflen(SCpnt); 2001 break; 2002 case NO_SENSE: 2003 /* This indicates a false check condition, so ignore it. An 2004 * unknown amount of data was transferred so treat it as an 2005 * error. 2006 */ 2007 SCpnt->result = 0; 2008 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2009 break; 2010 case ABORTED_COMMAND: 2011 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 2012 good_bytes = sd_completed_bytes(SCpnt); 2013 break; 2014 case ILLEGAL_REQUEST: 2015 switch (sshdr.asc) { 2016 case 0x10: /* DIX: Host detected corruption */ 2017 good_bytes = sd_completed_bytes(SCpnt); 2018 break; 2019 case 0x20: /* INVALID COMMAND OPCODE */ 2020 case 0x24: /* INVALID FIELD IN CDB */ 2021 switch (SCpnt->cmnd[0]) { 2022 case UNMAP: 2023 sd_config_discard(sdkp, SD_LBP_DISABLE); 2024 break; 2025 case WRITE_SAME_16: 2026 case WRITE_SAME: 2027 if (SCpnt->cmnd[1] & 8) { /* UNMAP */ 2028 sd_config_discard(sdkp, SD_LBP_DISABLE); 2029 } else { 2030 sdkp->device->no_write_same = 1; 2031 sd_config_write_same(sdkp); 2032 req->__data_len = blk_rq_bytes(req); 2033 req->rq_flags |= RQF_QUIET; 2034 } 2035 break; 2036 } 2037 } 2038 break; 2039 default: 2040 break; 2041 } 2042 2043 out: 2044 if (sd_is_zoned(sdkp)) 2045 sd_zbc_complete(SCpnt, good_bytes, &sshdr); 2046 2047 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 2048 "sd_done: completed %d of %d bytes\n", 2049 good_bytes, scsi_bufflen(SCpnt))); 2050 2051 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 2052 sd_dif_complete(SCpnt, good_bytes); 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) == 0) { 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 /* 2126 * Issue command to spin up drive when not ready 2127 */ 2128 if (!spintime) { 2129 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 2130 cmd[0] = START_STOP; 2131 cmd[1] = 1; /* Return immediately */ 2132 memset((void *) &cmd[2], 0, 8); 2133 cmd[4] = 1; /* Start spin cycle */ 2134 if (sdkp->device->start_stop_pwr_cond) 2135 cmd[4] |= 1 << 4; 2136 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 2137 NULL, 0, &sshdr, 2138 SD_TIMEOUT, SD_MAX_RETRIES, 2139 NULL); 2140 spintime_expire = jiffies + 100 * HZ; 2141 spintime = 1; 2142 } 2143 /* Wait 1 second for next try */ 2144 msleep(1000); 2145 printk("."); 2146 2147 /* 2148 * Wait for USB flash devices with slow firmware. 2149 * Yes, this sense key/ASC combination shouldn't 2150 * occur here. It's characteristic of these devices. 2151 */ 2152 } else if (sense_valid && 2153 sshdr.sense_key == UNIT_ATTENTION && 2154 sshdr.asc == 0x28) { 2155 if (!spintime) { 2156 spintime_expire = jiffies + 5 * HZ; 2157 spintime = 1; 2158 } 2159 /* Wait 1 second for next try */ 2160 msleep(1000); 2161 } else { 2162 /* we don't understand the sense code, so it's 2163 * probably pointless to loop */ 2164 if(!spintime) { 2165 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 2166 sd_print_sense_hdr(sdkp, &sshdr); 2167 } 2168 break; 2169 } 2170 2171 } while (spintime && time_before_eq(jiffies, spintime_expire)); 2172 2173 if (spintime) { 2174 if (scsi_status_is_good(the_result)) 2175 printk("ready\n"); 2176 else 2177 printk("not responding...\n"); 2178 } 2179 } 2180 2181 /* 2182 * Determine whether disk supports Data Integrity Field. 2183 */ 2184 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 2185 { 2186 struct scsi_device *sdp = sdkp->device; 2187 u8 type; 2188 int ret = 0; 2189 2190 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 2191 return ret; 2192 2193 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 2194 2195 if (type > T10_PI_TYPE3_PROTECTION) 2196 ret = -ENODEV; 2197 else if (scsi_host_dif_capable(sdp->host, type)) 2198 ret = 1; 2199 2200 if (sdkp->first_scan || type != sdkp->protection_type) 2201 switch (ret) { 2202 case -ENODEV: 2203 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ 2204 " protection type %u. Disabling disk!\n", 2205 type); 2206 break; 2207 case 1: 2208 sd_printk(KERN_NOTICE, sdkp, 2209 "Enabling DIF Type %u protection\n", type); 2210 break; 2211 case 0: 2212 sd_printk(KERN_NOTICE, sdkp, 2213 "Disabling DIF Type %u protection\n", type); 2214 break; 2215 } 2216 2217 sdkp->protection_type = type; 2218 2219 return ret; 2220 } 2221 2222 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 2223 struct scsi_sense_hdr *sshdr, int sense_valid, 2224 int the_result) 2225 { 2226 if (driver_byte(the_result) & DRIVER_SENSE) 2227 sd_print_sense_hdr(sdkp, sshdr); 2228 else 2229 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 2230 2231 /* 2232 * Set dirty bit for removable devices if not ready - 2233 * sometimes drives will not report this properly. 2234 */ 2235 if (sdp->removable && 2236 sense_valid && sshdr->sense_key == NOT_READY) 2237 set_media_not_present(sdkp); 2238 2239 /* 2240 * We used to set media_present to 0 here to indicate no media 2241 * in the drive, but some drives fail read capacity even with 2242 * media present, so we can't do that. 2243 */ 2244 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 2245 } 2246 2247 #define RC16_LEN 32 2248 #if RC16_LEN > SD_BUF_SIZE 2249 #error RC16_LEN must not be more than SD_BUF_SIZE 2250 #endif 2251 2252 #define READ_CAPACITY_RETRIES_ON_RESET 10 2253 2254 /* 2255 * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set 2256 * and the reported logical block size is bigger than 512 bytes. Note 2257 * that last_sector is a u64 and therefore logical_to_sectors() is not 2258 * applicable. 2259 */ 2260 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size) 2261 { 2262 u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9); 2263 2264 if (sizeof(sector_t) == 4 && last_sector > U32_MAX) 2265 return false; 2266 2267 return true; 2268 } 2269 2270 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 2271 unsigned char *buffer) 2272 { 2273 unsigned char cmd[16]; 2274 struct scsi_sense_hdr sshdr; 2275 int sense_valid = 0; 2276 int the_result; 2277 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2278 unsigned int alignment; 2279 unsigned long long lba; 2280 unsigned sector_size; 2281 2282 if (sdp->no_read_capacity_16) 2283 return -EINVAL; 2284 2285 do { 2286 memset(cmd, 0, 16); 2287 cmd[0] = SERVICE_ACTION_IN_16; 2288 cmd[1] = SAI_READ_CAPACITY_16; 2289 cmd[13] = RC16_LEN; 2290 memset(buffer, 0, RC16_LEN); 2291 2292 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2293 buffer, RC16_LEN, &sshdr, 2294 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2295 2296 if (media_not_present(sdkp, &sshdr)) 2297 return -ENODEV; 2298 2299 if (the_result) { 2300 sense_valid = scsi_sense_valid(&sshdr); 2301 if (sense_valid && 2302 sshdr.sense_key == ILLEGAL_REQUEST && 2303 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 2304 sshdr.ascq == 0x00) 2305 /* Invalid Command Operation Code or 2306 * Invalid Field in CDB, just retry 2307 * silently with RC10 */ 2308 return -EINVAL; 2309 if (sense_valid && 2310 sshdr.sense_key == UNIT_ATTENTION && 2311 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2312 /* Device reset might occur several times, 2313 * give it one more chance */ 2314 if (--reset_retries > 0) 2315 continue; 2316 } 2317 retries--; 2318 2319 } while (the_result && retries); 2320 2321 if (the_result) { 2322 sd_print_result(sdkp, "Read Capacity(16) failed", the_result); 2323 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2324 return -EINVAL; 2325 } 2326 2327 sector_size = get_unaligned_be32(&buffer[8]); 2328 lba = get_unaligned_be64(&buffer[0]); 2329 2330 if (sd_read_protection_type(sdkp, buffer) < 0) { 2331 sdkp->capacity = 0; 2332 return -ENODEV; 2333 } 2334 2335 if (!sd_addressable_capacity(lba, sector_size)) { 2336 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2337 "kernel compiled with support for large block " 2338 "devices.\n"); 2339 sdkp->capacity = 0; 2340 return -EOVERFLOW; 2341 } 2342 2343 /* Logical blocks per physical block exponent */ 2344 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 2345 2346 /* RC basis */ 2347 sdkp->rc_basis = (buffer[12] >> 4) & 0x3; 2348 2349 /* Lowest aligned logical block */ 2350 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 2351 blk_queue_alignment_offset(sdp->request_queue, alignment); 2352 if (alignment && sdkp->first_scan) 2353 sd_printk(KERN_NOTICE, sdkp, 2354 "physical block alignment offset: %u\n", alignment); 2355 2356 if (buffer[14] & 0x80) { /* LBPME */ 2357 sdkp->lbpme = 1; 2358 2359 if (buffer[14] & 0x40) /* LBPRZ */ 2360 sdkp->lbprz = 1; 2361 2362 sd_config_discard(sdkp, SD_LBP_WS16); 2363 } 2364 2365 sdkp->capacity = lba + 1; 2366 return sector_size; 2367 } 2368 2369 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 2370 unsigned char *buffer) 2371 { 2372 unsigned char cmd[16]; 2373 struct scsi_sense_hdr sshdr; 2374 int sense_valid = 0; 2375 int the_result; 2376 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2377 sector_t lba; 2378 unsigned sector_size; 2379 2380 do { 2381 cmd[0] = READ_CAPACITY; 2382 memset(&cmd[1], 0, 9); 2383 memset(buffer, 0, 8); 2384 2385 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2386 buffer, 8, &sshdr, 2387 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2388 2389 if (media_not_present(sdkp, &sshdr)) 2390 return -ENODEV; 2391 2392 if (the_result) { 2393 sense_valid = scsi_sense_valid(&sshdr); 2394 if (sense_valid && 2395 sshdr.sense_key == UNIT_ATTENTION && 2396 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2397 /* Device reset might occur several times, 2398 * give it one more chance */ 2399 if (--reset_retries > 0) 2400 continue; 2401 } 2402 retries--; 2403 2404 } while (the_result && retries); 2405 2406 if (the_result) { 2407 sd_print_result(sdkp, "Read Capacity(10) failed", the_result); 2408 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2409 return -EINVAL; 2410 } 2411 2412 sector_size = get_unaligned_be32(&buffer[4]); 2413 lba = get_unaligned_be32(&buffer[0]); 2414 2415 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 2416 /* Some buggy (usb cardreader) devices return an lba of 2417 0xffffffff when the want to report a size of 0 (with 2418 which they really mean no media is present) */ 2419 sdkp->capacity = 0; 2420 sdkp->physical_block_size = sector_size; 2421 return sector_size; 2422 } 2423 2424 if (!sd_addressable_capacity(lba, sector_size)) { 2425 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2426 "kernel compiled with support for large block " 2427 "devices.\n"); 2428 sdkp->capacity = 0; 2429 return -EOVERFLOW; 2430 } 2431 2432 sdkp->capacity = lba + 1; 2433 sdkp->physical_block_size = sector_size; 2434 return sector_size; 2435 } 2436 2437 static int sd_try_rc16_first(struct scsi_device *sdp) 2438 { 2439 if (sdp->host->max_cmd_len < 16) 2440 return 0; 2441 if (sdp->try_rc_10_first) 2442 return 0; 2443 if (sdp->scsi_level > SCSI_SPC_2) 2444 return 1; 2445 if (scsi_device_protection(sdp)) 2446 return 1; 2447 return 0; 2448 } 2449 2450 /* 2451 * read disk capacity 2452 */ 2453 static void 2454 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 2455 { 2456 int sector_size; 2457 struct scsi_device *sdp = sdkp->device; 2458 2459 if (sd_try_rc16_first(sdp)) { 2460 sector_size = read_capacity_16(sdkp, sdp, buffer); 2461 if (sector_size == -EOVERFLOW) 2462 goto got_data; 2463 if (sector_size == -ENODEV) 2464 return; 2465 if (sector_size < 0) 2466 sector_size = read_capacity_10(sdkp, sdp, buffer); 2467 if (sector_size < 0) 2468 return; 2469 } else { 2470 sector_size = read_capacity_10(sdkp, sdp, buffer); 2471 if (sector_size == -EOVERFLOW) 2472 goto got_data; 2473 if (sector_size < 0) 2474 return; 2475 if ((sizeof(sdkp->capacity) > 4) && 2476 (sdkp->capacity > 0xffffffffULL)) { 2477 int old_sector_size = sector_size; 2478 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 2479 "Trying to use READ CAPACITY(16).\n"); 2480 sector_size = read_capacity_16(sdkp, sdp, buffer); 2481 if (sector_size < 0) { 2482 sd_printk(KERN_NOTICE, sdkp, 2483 "Using 0xffffffff as device size\n"); 2484 sdkp->capacity = 1 + (sector_t) 0xffffffff; 2485 sector_size = old_sector_size; 2486 goto got_data; 2487 } 2488 } 2489 } 2490 2491 /* Some devices are known to return the total number of blocks, 2492 * not the highest block number. Some devices have versions 2493 * which do this and others which do not. Some devices we might 2494 * suspect of doing this but we don't know for certain. 2495 * 2496 * If we know the reported capacity is wrong, decrement it. If 2497 * we can only guess, then assume the number of blocks is even 2498 * (usually true but not always) and err on the side of lowering 2499 * the capacity. 2500 */ 2501 if (sdp->fix_capacity || 2502 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 2503 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 2504 "from its reported value: %llu\n", 2505 (unsigned long long) sdkp->capacity); 2506 --sdkp->capacity; 2507 } 2508 2509 got_data: 2510 if (sector_size == 0) { 2511 sector_size = 512; 2512 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 2513 "assuming 512.\n"); 2514 } 2515 2516 if (sector_size != 512 && 2517 sector_size != 1024 && 2518 sector_size != 2048 && 2519 sector_size != 4096) { 2520 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 2521 sector_size); 2522 /* 2523 * The user might want to re-format the drive with 2524 * a supported sectorsize. Once this happens, it 2525 * would be relatively trivial to set the thing up. 2526 * For this reason, we leave the thing in the table. 2527 */ 2528 sdkp->capacity = 0; 2529 /* 2530 * set a bogus sector size so the normal read/write 2531 * logic in the block layer will eventually refuse any 2532 * request on this device without tripping over power 2533 * of two sector size assumptions 2534 */ 2535 sector_size = 512; 2536 } 2537 blk_queue_logical_block_size(sdp->request_queue, sector_size); 2538 blk_queue_physical_block_size(sdp->request_queue, 2539 sdkp->physical_block_size); 2540 sdkp->device->sector_size = sector_size; 2541 2542 if (sdkp->capacity > 0xffffffff) 2543 sdp->use_16_for_rw = 1; 2544 2545 } 2546 2547 /* 2548 * Print disk capacity 2549 */ 2550 static void 2551 sd_print_capacity(struct scsi_disk *sdkp, 2552 sector_t old_capacity) 2553 { 2554 int sector_size = sdkp->device->sector_size; 2555 char cap_str_2[10], cap_str_10[10]; 2556 2557 string_get_size(sdkp->capacity, sector_size, 2558 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); 2559 string_get_size(sdkp->capacity, sector_size, 2560 STRING_UNITS_10, cap_str_10, 2561 sizeof(cap_str_10)); 2562 2563 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 2564 sd_printk(KERN_NOTICE, sdkp, 2565 "%llu %d-byte logical blocks: (%s/%s)\n", 2566 (unsigned long long)sdkp->capacity, 2567 sector_size, cap_str_10, cap_str_2); 2568 2569 if (sdkp->physical_block_size != sector_size) 2570 sd_printk(KERN_NOTICE, sdkp, 2571 "%u-byte physical blocks\n", 2572 sdkp->physical_block_size); 2573 2574 sd_zbc_print_zones(sdkp); 2575 } 2576 } 2577 2578 /* called with buffer of length 512 */ 2579 static inline int 2580 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 2581 unsigned char *buffer, int len, struct scsi_mode_data *data, 2582 struct scsi_sense_hdr *sshdr) 2583 { 2584 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 2585 SD_TIMEOUT, SD_MAX_RETRIES, data, 2586 sshdr); 2587 } 2588 2589 /* 2590 * read write protect setting, if possible - called only in sd_revalidate_disk() 2591 * called with buffer of length SD_BUF_SIZE 2592 */ 2593 static void 2594 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 2595 { 2596 int res; 2597 struct scsi_device *sdp = sdkp->device; 2598 struct scsi_mode_data data; 2599 int old_wp = sdkp->write_prot; 2600 2601 set_disk_ro(sdkp->disk, 0); 2602 if (sdp->skip_ms_page_3f) { 2603 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 2604 return; 2605 } 2606 2607 if (sdp->use_192_bytes_for_3f) { 2608 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 2609 } else { 2610 /* 2611 * First attempt: ask for all pages (0x3F), but only 4 bytes. 2612 * We have to start carefully: some devices hang if we ask 2613 * for more than is available. 2614 */ 2615 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 2616 2617 /* 2618 * Second attempt: ask for page 0 When only page 0 is 2619 * implemented, a request for page 3F may return Sense Key 2620 * 5: Illegal Request, Sense Code 24: Invalid field in 2621 * CDB. 2622 */ 2623 if (!scsi_status_is_good(res)) 2624 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 2625 2626 /* 2627 * Third attempt: ask 255 bytes, as we did earlier. 2628 */ 2629 if (!scsi_status_is_good(res)) 2630 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 2631 &data, NULL); 2632 } 2633 2634 if (!scsi_status_is_good(res)) { 2635 sd_first_printk(KERN_WARNING, sdkp, 2636 "Test WP failed, assume Write Enabled\n"); 2637 } else { 2638 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 2639 set_disk_ro(sdkp->disk, sdkp->write_prot); 2640 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 2641 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 2642 sdkp->write_prot ? "on" : "off"); 2643 sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer); 2644 } 2645 } 2646 } 2647 2648 /* 2649 * sd_read_cache_type - called only from sd_revalidate_disk() 2650 * called with buffer of length SD_BUF_SIZE 2651 */ 2652 static void 2653 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 2654 { 2655 int len = 0, res; 2656 struct scsi_device *sdp = sdkp->device; 2657 2658 int dbd; 2659 int modepage; 2660 int first_len; 2661 struct scsi_mode_data data; 2662 struct scsi_sense_hdr sshdr; 2663 int old_wce = sdkp->WCE; 2664 int old_rcd = sdkp->RCD; 2665 int old_dpofua = sdkp->DPOFUA; 2666 2667 2668 if (sdkp->cache_override) 2669 return; 2670 2671 first_len = 4; 2672 if (sdp->skip_ms_page_8) { 2673 if (sdp->type == TYPE_RBC) 2674 goto defaults; 2675 else { 2676 if (sdp->skip_ms_page_3f) 2677 goto defaults; 2678 modepage = 0x3F; 2679 if (sdp->use_192_bytes_for_3f) 2680 first_len = 192; 2681 dbd = 0; 2682 } 2683 } else if (sdp->type == TYPE_RBC) { 2684 modepage = 6; 2685 dbd = 8; 2686 } else { 2687 modepage = 8; 2688 dbd = 0; 2689 } 2690 2691 /* cautiously ask */ 2692 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, 2693 &data, &sshdr); 2694 2695 if (!scsi_status_is_good(res)) 2696 goto bad_sense; 2697 2698 if (!data.header_length) { 2699 modepage = 6; 2700 first_len = 0; 2701 sd_first_printk(KERN_ERR, sdkp, 2702 "Missing header in MODE_SENSE response\n"); 2703 } 2704 2705 /* that went OK, now ask for the proper length */ 2706 len = data.length; 2707 2708 /* 2709 * We're only interested in the first three bytes, actually. 2710 * But the data cache page is defined for the first 20. 2711 */ 2712 if (len < 3) 2713 goto bad_sense; 2714 else if (len > SD_BUF_SIZE) { 2715 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " 2716 "data from %d to %d bytes\n", len, SD_BUF_SIZE); 2717 len = SD_BUF_SIZE; 2718 } 2719 if (modepage == 0x3F && sdp->use_192_bytes_for_3f) 2720 len = 192; 2721 2722 /* Get the data */ 2723 if (len > first_len) 2724 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, 2725 &data, &sshdr); 2726 2727 if (scsi_status_is_good(res)) { 2728 int offset = data.header_length + data.block_descriptor_length; 2729 2730 while (offset < len) { 2731 u8 page_code = buffer[offset] & 0x3F; 2732 u8 spf = buffer[offset] & 0x40; 2733 2734 if (page_code == 8 || page_code == 6) { 2735 /* We're interested only in the first 3 bytes. 2736 */ 2737 if (len - offset <= 2) { 2738 sd_first_printk(KERN_ERR, sdkp, 2739 "Incomplete mode parameter " 2740 "data\n"); 2741 goto defaults; 2742 } else { 2743 modepage = page_code; 2744 goto Page_found; 2745 } 2746 } else { 2747 /* Go to the next page */ 2748 if (spf && len - offset > 3) 2749 offset += 4 + (buffer[offset+2] << 8) + 2750 buffer[offset+3]; 2751 else if (!spf && len - offset > 1) 2752 offset += 2 + buffer[offset+1]; 2753 else { 2754 sd_first_printk(KERN_ERR, sdkp, 2755 "Incomplete mode " 2756 "parameter data\n"); 2757 goto defaults; 2758 } 2759 } 2760 } 2761 2762 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n"); 2763 goto defaults; 2764 2765 Page_found: 2766 if (modepage == 8) { 2767 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 2768 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 2769 } else { 2770 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 2771 sdkp->RCD = 0; 2772 } 2773 2774 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 2775 if (sdp->broken_fua) { 2776 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n"); 2777 sdkp->DPOFUA = 0; 2778 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw && 2779 !sdkp->device->use_16_for_rw) { 2780 sd_first_printk(KERN_NOTICE, sdkp, 2781 "Uses READ/WRITE(6), disabling FUA\n"); 2782 sdkp->DPOFUA = 0; 2783 } 2784 2785 /* No cache flush allowed for write protected devices */ 2786 if (sdkp->WCE && sdkp->write_prot) 2787 sdkp->WCE = 0; 2788 2789 if (sdkp->first_scan || old_wce != sdkp->WCE || 2790 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 2791 sd_printk(KERN_NOTICE, sdkp, 2792 "Write cache: %s, read cache: %s, %s\n", 2793 sdkp->WCE ? "enabled" : "disabled", 2794 sdkp->RCD ? "disabled" : "enabled", 2795 sdkp->DPOFUA ? "supports DPO and FUA" 2796 : "doesn't support DPO or FUA"); 2797 2798 return; 2799 } 2800 2801 bad_sense: 2802 if (scsi_sense_valid(&sshdr) && 2803 sshdr.sense_key == ILLEGAL_REQUEST && 2804 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 2805 /* Invalid field in CDB */ 2806 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 2807 else 2808 sd_first_printk(KERN_ERR, sdkp, 2809 "Asking for cache data failed\n"); 2810 2811 defaults: 2812 if (sdp->wce_default_on) { 2813 sd_first_printk(KERN_NOTICE, sdkp, 2814 "Assuming drive cache: write back\n"); 2815 sdkp->WCE = 1; 2816 } else { 2817 sd_first_printk(KERN_ERR, sdkp, 2818 "Assuming drive cache: write through\n"); 2819 sdkp->WCE = 0; 2820 } 2821 sdkp->RCD = 0; 2822 sdkp->DPOFUA = 0; 2823 } 2824 2825 /* 2826 * The ATO bit indicates whether the DIF application tag is available 2827 * for use by the operating system. 2828 */ 2829 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 2830 { 2831 int res, offset; 2832 struct scsi_device *sdp = sdkp->device; 2833 struct scsi_mode_data data; 2834 struct scsi_sense_hdr sshdr; 2835 2836 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC) 2837 return; 2838 2839 if (sdkp->protection_type == 0) 2840 return; 2841 2842 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 2843 SD_MAX_RETRIES, &data, &sshdr); 2844 2845 if (!scsi_status_is_good(res) || !data.header_length || 2846 data.length < 6) { 2847 sd_first_printk(KERN_WARNING, sdkp, 2848 "getting Control mode page failed, assume no ATO\n"); 2849 2850 if (scsi_sense_valid(&sshdr)) 2851 sd_print_sense_hdr(sdkp, &sshdr); 2852 2853 return; 2854 } 2855 2856 offset = data.header_length + data.block_descriptor_length; 2857 2858 if ((buffer[offset] & 0x3f) != 0x0a) { 2859 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2860 return; 2861 } 2862 2863 if ((buffer[offset + 5] & 0x80) == 0) 2864 return; 2865 2866 sdkp->ATO = 1; 2867 2868 return; 2869 } 2870 2871 /** 2872 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2873 * @sdkp: disk to query 2874 */ 2875 static void sd_read_block_limits(struct scsi_disk *sdkp) 2876 { 2877 unsigned int sector_sz = sdkp->device->sector_size; 2878 const int vpd_len = 64; 2879 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2880 2881 if (!buffer || 2882 /* Block Limits VPD */ 2883 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2884 goto out; 2885 2886 blk_queue_io_min(sdkp->disk->queue, 2887 get_unaligned_be16(&buffer[6]) * sector_sz); 2888 2889 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]); 2890 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]); 2891 2892 if (buffer[3] == 0x3c) { 2893 unsigned int lba_count, desc_count; 2894 2895 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); 2896 2897 if (!sdkp->lbpme) 2898 goto out; 2899 2900 lba_count = get_unaligned_be32(&buffer[20]); 2901 desc_count = get_unaligned_be32(&buffer[24]); 2902 2903 if (lba_count && desc_count) 2904 sdkp->max_unmap_blocks = lba_count; 2905 2906 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); 2907 2908 if (buffer[32] & 0x80) 2909 sdkp->unmap_alignment = 2910 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2911 2912 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ 2913 2914 if (sdkp->max_unmap_blocks) 2915 sd_config_discard(sdkp, SD_LBP_UNMAP); 2916 else 2917 sd_config_discard(sdkp, SD_LBP_WS16); 2918 2919 } else { /* LBP VPD page tells us what to use */ 2920 if (sdkp->lbpu && sdkp->max_unmap_blocks) 2921 sd_config_discard(sdkp, SD_LBP_UNMAP); 2922 else if (sdkp->lbpws) 2923 sd_config_discard(sdkp, SD_LBP_WS16); 2924 else if (sdkp->lbpws10) 2925 sd_config_discard(sdkp, SD_LBP_WS10); 2926 else 2927 sd_config_discard(sdkp, SD_LBP_DISABLE); 2928 } 2929 } 2930 2931 out: 2932 kfree(buffer); 2933 } 2934 2935 /** 2936 * sd_read_block_characteristics - Query block dev. characteristics 2937 * @sdkp: disk to query 2938 */ 2939 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2940 { 2941 struct request_queue *q = sdkp->disk->queue; 2942 unsigned char *buffer; 2943 u16 rot; 2944 const int vpd_len = 64; 2945 2946 buffer = kmalloc(vpd_len, GFP_KERNEL); 2947 2948 if (!buffer || 2949 /* Block Device Characteristics VPD */ 2950 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2951 goto out; 2952 2953 rot = get_unaligned_be16(&buffer[4]); 2954 2955 if (rot == 1) { 2956 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); 2957 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q); 2958 } 2959 2960 if (sdkp->device->type == TYPE_ZBC) { 2961 /* Host-managed */ 2962 q->limits.zoned = BLK_ZONED_HM; 2963 } else { 2964 sdkp->zoned = (buffer[8] >> 4) & 3; 2965 if (sdkp->zoned == 1) 2966 /* Host-aware */ 2967 q->limits.zoned = BLK_ZONED_HA; 2968 else 2969 /* 2970 * Treat drive-managed devices as 2971 * regular block devices. 2972 */ 2973 q->limits.zoned = BLK_ZONED_NONE; 2974 } 2975 if (blk_queue_is_zoned(q) && sdkp->first_scan) 2976 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n", 2977 q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware"); 2978 2979 out: 2980 kfree(buffer); 2981 } 2982 2983 /** 2984 * sd_read_block_provisioning - Query provisioning VPD page 2985 * @sdkp: disk to query 2986 */ 2987 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 2988 { 2989 unsigned char *buffer; 2990 const int vpd_len = 8; 2991 2992 if (sdkp->lbpme == 0) 2993 return; 2994 2995 buffer = kmalloc(vpd_len, GFP_KERNEL); 2996 2997 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) 2998 goto out; 2999 3000 sdkp->lbpvpd = 1; 3001 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ 3002 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ 3003 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ 3004 3005 out: 3006 kfree(buffer); 3007 } 3008 3009 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) 3010 { 3011 struct scsi_device *sdev = sdkp->device; 3012 3013 if (sdev->host->no_write_same) { 3014 sdev->no_write_same = 1; 3015 3016 return; 3017 } 3018 3019 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) { 3020 /* too large values might cause issues with arcmsr */ 3021 int vpd_buf_len = 64; 3022 3023 sdev->no_report_opcodes = 1; 3024 3025 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION 3026 * CODES is unsupported and the device has an ATA 3027 * Information VPD page (SAT). 3028 */ 3029 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len)) 3030 sdev->no_write_same = 1; 3031 } 3032 3033 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1) 3034 sdkp->ws16 = 1; 3035 3036 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1) 3037 sdkp->ws10 = 1; 3038 } 3039 3040 static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer) 3041 { 3042 struct scsi_device *sdev = sdkp->device; 3043 3044 if (!sdev->security_supported) 3045 return; 3046 3047 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, 3048 SECURITY_PROTOCOL_IN) == 1 && 3049 scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, 3050 SECURITY_PROTOCOL_OUT) == 1) 3051 sdkp->security = 1; 3052 } 3053 3054 /** 3055 * sd_revalidate_disk - called the first time a new disk is seen, 3056 * performs disk spin up, read_capacity, etc. 3057 * @disk: struct gendisk we care about 3058 **/ 3059 static int sd_revalidate_disk(struct gendisk *disk) 3060 { 3061 struct scsi_disk *sdkp = scsi_disk(disk); 3062 struct scsi_device *sdp = sdkp->device; 3063 struct request_queue *q = sdkp->disk->queue; 3064 sector_t old_capacity = sdkp->capacity; 3065 unsigned char *buffer; 3066 unsigned int dev_max, rw_max; 3067 3068 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 3069 "sd_revalidate_disk\n")); 3070 3071 /* 3072 * If the device is offline, don't try and read capacity or any 3073 * of the other niceties. 3074 */ 3075 if (!scsi_device_online(sdp)) 3076 goto out; 3077 3078 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 3079 if (!buffer) { 3080 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 3081 "allocation failure.\n"); 3082 goto out; 3083 } 3084 3085 sd_spinup_disk(sdkp); 3086 3087 /* 3088 * Without media there is no reason to ask; moreover, some devices 3089 * react badly if we do. 3090 */ 3091 if (sdkp->media_present) { 3092 sd_read_capacity(sdkp, buffer); 3093 3094 if (scsi_device_supports_vpd(sdp)) { 3095 sd_read_block_provisioning(sdkp); 3096 sd_read_block_limits(sdkp); 3097 sd_read_block_characteristics(sdkp); 3098 sd_zbc_read_zones(sdkp, buffer); 3099 } 3100 3101 sd_print_capacity(sdkp, old_capacity); 3102 3103 sd_read_write_protect_flag(sdkp, buffer); 3104 sd_read_cache_type(sdkp, buffer); 3105 sd_read_app_tag_own(sdkp, buffer); 3106 sd_read_write_same(sdkp, buffer); 3107 sd_read_security(sdkp, buffer); 3108 } 3109 3110 /* 3111 * We now have all cache related info, determine how we deal 3112 * with flush requests. 3113 */ 3114 sd_set_flush_flag(sdkp); 3115 3116 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */ 3117 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS; 3118 3119 /* Some devices report a maximum block count for READ/WRITE requests. */ 3120 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks); 3121 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max); 3122 3123 /* 3124 * Determine the device's preferred I/O size for reads and writes 3125 * unless the reported value is unreasonably small, large, or 3126 * garbage. 3127 */ 3128 if (sdkp->opt_xfer_blocks && 3129 sdkp->opt_xfer_blocks <= dev_max && 3130 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS && 3131 logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) { 3132 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks); 3133 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks); 3134 } else 3135 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max), 3136 (sector_t)BLK_DEF_MAX_SECTORS); 3137 3138 /* Do not exceed controller limit */ 3139 rw_max = min(rw_max, queue_max_hw_sectors(q)); 3140 3141 /* 3142 * Only update max_sectors if previously unset or if the current value 3143 * exceeds the capabilities of the hardware. 3144 */ 3145 if (sdkp->first_scan || 3146 q->limits.max_sectors > q->limits.max_dev_sectors || 3147 q->limits.max_sectors > q->limits.max_hw_sectors) 3148 q->limits.max_sectors = rw_max; 3149 3150 sdkp->first_scan = 0; 3151 3152 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity)); 3153 sd_config_write_same(sdkp); 3154 kfree(buffer); 3155 3156 out: 3157 return 0; 3158 } 3159 3160 /** 3161 * sd_unlock_native_capacity - unlock native capacity 3162 * @disk: struct gendisk to set capacity for 3163 * 3164 * Block layer calls this function if it detects that partitions 3165 * on @disk reach beyond the end of the device. If the SCSI host 3166 * implements ->unlock_native_capacity() method, it's invoked to 3167 * give it a chance to adjust the device capacity. 3168 * 3169 * CONTEXT: 3170 * Defined by block layer. Might sleep. 3171 */ 3172 static void sd_unlock_native_capacity(struct gendisk *disk) 3173 { 3174 struct scsi_device *sdev = scsi_disk(disk)->device; 3175 3176 if (sdev->host->hostt->unlock_native_capacity) 3177 sdev->host->hostt->unlock_native_capacity(sdev); 3178 } 3179 3180 /** 3181 * sd_format_disk_name - format disk name 3182 * @prefix: name prefix - ie. "sd" for SCSI disks 3183 * @index: index of the disk to format name for 3184 * @buf: output buffer 3185 * @buflen: length of the output buffer 3186 * 3187 * SCSI disk names starts at sda. The 26th device is sdz and the 3188 * 27th is sdaa. The last one for two lettered suffix is sdzz 3189 * which is followed by sdaaa. 3190 * 3191 * This is basically 26 base counting with one extra 'nil' entry 3192 * at the beginning from the second digit on and can be 3193 * determined using similar method as 26 base conversion with the 3194 * index shifted -1 after each digit is computed. 3195 * 3196 * CONTEXT: 3197 * Don't care. 3198 * 3199 * RETURNS: 3200 * 0 on success, -errno on failure. 3201 */ 3202 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 3203 { 3204 const int base = 'z' - 'a' + 1; 3205 char *begin = buf + strlen(prefix); 3206 char *end = buf + buflen; 3207 char *p; 3208 int unit; 3209 3210 p = end - 1; 3211 *p = '\0'; 3212 unit = base; 3213 do { 3214 if (p == begin) 3215 return -EINVAL; 3216 *--p = 'a' + (index % unit); 3217 index = (index / unit) - 1; 3218 } while (index >= 0); 3219 3220 memmove(begin, p, end - p); 3221 memcpy(buf, prefix, strlen(prefix)); 3222 3223 return 0; 3224 } 3225 3226 /* 3227 * The asynchronous part of sd_probe 3228 */ 3229 static void sd_probe_async(void *data, async_cookie_t cookie) 3230 { 3231 struct scsi_disk *sdkp = data; 3232 struct scsi_device *sdp; 3233 struct gendisk *gd; 3234 u32 index; 3235 struct device *dev; 3236 3237 sdp = sdkp->device; 3238 gd = sdkp->disk; 3239 index = sdkp->index; 3240 dev = &sdp->sdev_gendev; 3241 3242 gd->major = sd_major((index & 0xf0) >> 4); 3243 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 3244 3245 gd->fops = &sd_fops; 3246 gd->private_data = &sdkp->driver; 3247 gd->queue = sdkp->device->request_queue; 3248 3249 /* defaults, until the device tells us otherwise */ 3250 sdp->sector_size = 512; 3251 sdkp->capacity = 0; 3252 sdkp->media_present = 1; 3253 sdkp->write_prot = 0; 3254 sdkp->cache_override = 0; 3255 sdkp->WCE = 0; 3256 sdkp->RCD = 0; 3257 sdkp->ATO = 0; 3258 sdkp->first_scan = 1; 3259 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; 3260 3261 sd_revalidate_disk(gd); 3262 3263 gd->flags = GENHD_FL_EXT_DEVT; 3264 if (sdp->removable) { 3265 gd->flags |= GENHD_FL_REMOVABLE; 3266 gd->events |= DISK_EVENT_MEDIA_CHANGE; 3267 } 3268 3269 blk_pm_runtime_init(sdp->request_queue, dev); 3270 device_add_disk(dev, gd); 3271 if (sdkp->capacity) 3272 sd_dif_config_host(sdkp); 3273 3274 sd_revalidate_disk(gd); 3275 3276 if (sdkp->security) { 3277 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit); 3278 if (sdkp->opal_dev) 3279 sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n"); 3280 } 3281 3282 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 3283 sdp->removable ? "removable " : ""); 3284 scsi_autopm_put_device(sdp); 3285 put_device(&sdkp->dev); 3286 } 3287 3288 /** 3289 * sd_probe - called during driver initialization and whenever a 3290 * new scsi device is attached to the system. It is called once 3291 * for each scsi device (not just disks) present. 3292 * @dev: pointer to device object 3293 * 3294 * Returns 0 if successful (or not interested in this scsi device 3295 * (e.g. scanner)); 1 when there is an error. 3296 * 3297 * Note: this function is invoked from the scsi mid-level. 3298 * This function sets up the mapping between a given 3299 * <host,channel,id,lun> (found in sdp) and new device name 3300 * (e.g. /dev/sda). More precisely it is the block device major 3301 * and minor number that is chosen here. 3302 * 3303 * Assume sd_probe is not re-entrant (for time being) 3304 * Also think about sd_probe() and sd_remove() running coincidentally. 3305 **/ 3306 static int sd_probe(struct device *dev) 3307 { 3308 struct scsi_device *sdp = to_scsi_device(dev); 3309 struct scsi_disk *sdkp; 3310 struct gendisk *gd; 3311 int index; 3312 int error; 3313 3314 scsi_autopm_get_device(sdp); 3315 error = -ENODEV; 3316 if (sdp->type != TYPE_DISK && 3317 sdp->type != TYPE_ZBC && 3318 sdp->type != TYPE_MOD && 3319 sdp->type != TYPE_RBC) 3320 goto out; 3321 3322 #ifndef CONFIG_BLK_DEV_ZONED 3323 if (sdp->type == TYPE_ZBC) 3324 goto out; 3325 #endif 3326 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 3327 "sd_probe\n")); 3328 3329 error = -ENOMEM; 3330 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 3331 if (!sdkp) 3332 goto out; 3333 3334 gd = alloc_disk(SD_MINORS); 3335 if (!gd) 3336 goto out_free; 3337 3338 do { 3339 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 3340 goto out_put; 3341 3342 spin_lock(&sd_index_lock); 3343 error = ida_get_new(&sd_index_ida, &index); 3344 spin_unlock(&sd_index_lock); 3345 } while (error == -EAGAIN); 3346 3347 if (error) { 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 spin_lock(&sd_index_lock); 3392 ida_remove(&sd_index_ida, index); 3393 spin_unlock(&sd_index_lock); 3394 out_put: 3395 put_disk(gd); 3396 out_free: 3397 kfree(sdkp); 3398 out: 3399 scsi_autopm_put_device(sdp); 3400 return error; 3401 } 3402 3403 /** 3404 * sd_remove - called whenever a scsi disk (previously recognized by 3405 * sd_probe) is detached from the system. It is called (potentially 3406 * multiple times) during sd module unload. 3407 * @dev: pointer to device object 3408 * 3409 * Note: this function is invoked from the scsi mid-level. 3410 * This function potentially frees up a device name (e.g. /dev/sdc) 3411 * that could be re-used by a subsequent sd_probe(). 3412 * This function is not called when the built-in sd driver is "exit-ed". 3413 **/ 3414 static int sd_remove(struct device *dev) 3415 { 3416 struct scsi_disk *sdkp; 3417 dev_t devt; 3418 3419 sdkp = dev_get_drvdata(dev); 3420 devt = disk_devt(sdkp->disk); 3421 scsi_autopm_get_device(sdkp->device); 3422 3423 async_synchronize_full_domain(&scsi_sd_pm_domain); 3424 async_synchronize_full_domain(&scsi_sd_probe_domain); 3425 device_del(&sdkp->dev); 3426 del_gendisk(sdkp->disk); 3427 sd_shutdown(dev); 3428 3429 sd_zbc_remove(sdkp); 3430 3431 free_opal_dev(sdkp->opal_dev); 3432 3433 blk_register_region(devt, SD_MINORS, NULL, 3434 sd_default_probe, NULL, NULL); 3435 3436 mutex_lock(&sd_ref_mutex); 3437 dev_set_drvdata(dev, NULL); 3438 put_device(&sdkp->dev); 3439 mutex_unlock(&sd_ref_mutex); 3440 3441 return 0; 3442 } 3443 3444 /** 3445 * scsi_disk_release - Called to free the scsi_disk structure 3446 * @dev: pointer to embedded class device 3447 * 3448 * sd_ref_mutex must be held entering this routine. Because it is 3449 * called on last put, you should always use the scsi_disk_get() 3450 * scsi_disk_put() helpers which manipulate the semaphore directly 3451 * and never do a direct put_device. 3452 **/ 3453 static void scsi_disk_release(struct device *dev) 3454 { 3455 struct scsi_disk *sdkp = to_scsi_disk(dev); 3456 struct gendisk *disk = sdkp->disk; 3457 3458 spin_lock(&sd_index_lock); 3459 ida_remove(&sd_index_ida, sdkp->index); 3460 spin_unlock(&sd_index_lock); 3461 3462 disk->private_data = NULL; 3463 put_disk(disk); 3464 put_device(&sdkp->device->sdev_gendev); 3465 3466 kfree(sdkp); 3467 } 3468 3469 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 3470 { 3471 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 3472 struct scsi_sense_hdr sshdr; 3473 struct scsi_device *sdp = sdkp->device; 3474 int res; 3475 3476 if (start) 3477 cmd[4] |= 1; /* START */ 3478 3479 if (sdp->start_stop_pwr_cond) 3480 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 3481 3482 if (!scsi_device_online(sdp)) 3483 return -ENODEV; 3484 3485 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr, 3486 SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL); 3487 if (res) { 3488 sd_print_result(sdkp, "Start/Stop Unit failed", res); 3489 if (driver_byte(res) & DRIVER_SENSE) 3490 sd_print_sense_hdr(sdkp, &sshdr); 3491 if (scsi_sense_valid(&sshdr) && 3492 /* 0x3a is medium not present */ 3493 sshdr.asc == 0x3a) 3494 res = 0; 3495 } 3496 3497 /* SCSI error codes must not go to the generic layer */ 3498 if (res) 3499 return -EIO; 3500 3501 return 0; 3502 } 3503 3504 /* 3505 * Send a SYNCHRONIZE CACHE instruction down to the device through 3506 * the normal SCSI command structure. Wait for the command to 3507 * complete. 3508 */ 3509 static void sd_shutdown(struct device *dev) 3510 { 3511 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3512 3513 if (!sdkp) 3514 return; /* this can happen */ 3515 3516 if (pm_runtime_suspended(dev)) 3517 return; 3518 3519 if (sdkp->WCE && sdkp->media_present) { 3520 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3521 sd_sync_cache(sdkp, NULL); 3522 } 3523 3524 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 3525 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3526 sd_start_stop_device(sdkp, 0); 3527 } 3528 } 3529 3530 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors) 3531 { 3532 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3533 struct scsi_sense_hdr sshdr; 3534 int ret = 0; 3535 3536 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */ 3537 return 0; 3538 3539 if (sdkp->WCE && sdkp->media_present) { 3540 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3541 ret = sd_sync_cache(sdkp, &sshdr); 3542 3543 if (ret) { 3544 /* ignore OFFLINE device */ 3545 if (ret == -ENODEV) 3546 return 0; 3547 3548 if (!scsi_sense_valid(&sshdr) || 3549 sshdr.sense_key != ILLEGAL_REQUEST) 3550 return ret; 3551 3552 /* 3553 * sshdr.sense_key == ILLEGAL_REQUEST means this drive 3554 * doesn't support sync. There's not much to do and 3555 * suspend shouldn't fail. 3556 */ 3557 ret = 0; 3558 } 3559 } 3560 3561 if (sdkp->device->manage_start_stop) { 3562 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3563 /* an error is not worth aborting a system sleep */ 3564 ret = sd_start_stop_device(sdkp, 0); 3565 if (ignore_stop_errors) 3566 ret = 0; 3567 } 3568 3569 return ret; 3570 } 3571 3572 static int sd_suspend_system(struct device *dev) 3573 { 3574 return sd_suspend_common(dev, true); 3575 } 3576 3577 static int sd_suspend_runtime(struct device *dev) 3578 { 3579 return sd_suspend_common(dev, false); 3580 } 3581 3582 static int sd_resume(struct device *dev) 3583 { 3584 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3585 int ret; 3586 3587 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */ 3588 return 0; 3589 3590 if (!sdkp->device->manage_start_stop) 3591 return 0; 3592 3593 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 3594 ret = sd_start_stop_device(sdkp, 1); 3595 if (!ret) 3596 opal_unlock_from_suspend(sdkp->opal_dev); 3597 return ret; 3598 } 3599 3600 /** 3601 * init_sd - entry point for this driver (both when built in or when 3602 * a module). 3603 * 3604 * Note: this function registers this driver with the scsi mid-level. 3605 **/ 3606 static int __init init_sd(void) 3607 { 3608 int majors = 0, i, err; 3609 3610 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 3611 3612 for (i = 0; i < SD_MAJORS; i++) { 3613 if (register_blkdev(sd_major(i), "sd") != 0) 3614 continue; 3615 majors++; 3616 blk_register_region(sd_major(i), SD_MINORS, NULL, 3617 sd_default_probe, NULL, NULL); 3618 } 3619 3620 if (!majors) 3621 return -ENODEV; 3622 3623 err = class_register(&sd_disk_class); 3624 if (err) 3625 goto err_out; 3626 3627 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 3628 0, 0, NULL); 3629 if (!sd_cdb_cache) { 3630 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 3631 err = -ENOMEM; 3632 goto err_out_class; 3633 } 3634 3635 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 3636 if (!sd_cdb_pool) { 3637 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 3638 err = -ENOMEM; 3639 goto err_out_cache; 3640 } 3641 3642 err = scsi_register_driver(&sd_template.gendrv); 3643 if (err) 3644 goto err_out_driver; 3645 3646 return 0; 3647 3648 err_out_driver: 3649 mempool_destroy(sd_cdb_pool); 3650 3651 err_out_cache: 3652 kmem_cache_destroy(sd_cdb_cache); 3653 3654 err_out_class: 3655 class_unregister(&sd_disk_class); 3656 err_out: 3657 for (i = 0; i < SD_MAJORS; i++) 3658 unregister_blkdev(sd_major(i), "sd"); 3659 return err; 3660 } 3661 3662 /** 3663 * exit_sd - exit point for this driver (when it is a module). 3664 * 3665 * Note: this function unregisters this driver from the scsi mid-level. 3666 **/ 3667 static void __exit exit_sd(void) 3668 { 3669 int i; 3670 3671 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 3672 3673 scsi_unregister_driver(&sd_template.gendrv); 3674 mempool_destroy(sd_cdb_pool); 3675 kmem_cache_destroy(sd_cdb_cache); 3676 3677 class_unregister(&sd_disk_class); 3678 3679 for (i = 0; i < SD_MAJORS; i++) { 3680 blk_unregister_region(sd_major(i), SD_MINORS); 3681 unregister_blkdev(sd_major(i), "sd"); 3682 } 3683 } 3684 3685 module_init(init_sd); 3686 module_exit(exit_sd); 3687 3688 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 3689 struct scsi_sense_hdr *sshdr) 3690 { 3691 scsi_print_sense_hdr(sdkp->device, 3692 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr); 3693 } 3694 3695 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg, 3696 int result) 3697 { 3698 const char *hb_string = scsi_hostbyte_string(result); 3699 const char *db_string = scsi_driverbyte_string(result); 3700 3701 if (hb_string || db_string) 3702 sd_printk(KERN_INFO, sdkp, 3703 "%s: Result: hostbyte=%s driverbyte=%s\n", msg, 3704 hb_string ? hb_string : "invalid", 3705 db_string ? db_string : "invalid"); 3706 else 3707 sd_printk(KERN_INFO, sdkp, 3708 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n", 3709 msg, host_byte(result), driver_byte(result)); 3710 } 3711 3712