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/pm_runtime.h> 54 #include <asm/uaccess.h> 55 #include <asm/unaligned.h> 56 57 #include <scsi/scsi.h> 58 #include <scsi/scsi_cmnd.h> 59 #include <scsi/scsi_dbg.h> 60 #include <scsi/scsi_device.h> 61 #include <scsi/scsi_driver.h> 62 #include <scsi/scsi_eh.h> 63 #include <scsi/scsi_host.h> 64 #include <scsi/scsi_ioctl.h> 65 #include <scsi/scsicam.h> 66 67 #include "sd.h" 68 #include "scsi_priv.h" 69 #include "scsi_logging.h" 70 71 MODULE_AUTHOR("Eric Youngdale"); 72 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 73 MODULE_LICENSE("GPL"); 74 75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 94 95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 96 #define SD_MINORS 16 97 #else 98 #define SD_MINORS 0 99 #endif 100 101 static void sd_config_discard(struct scsi_disk *, unsigned int); 102 static void sd_config_write_same(struct scsi_disk *); 103 static int sd_revalidate_disk(struct gendisk *); 104 static void sd_unlock_native_capacity(struct gendisk *disk); 105 static int sd_probe(struct device *); 106 static int sd_remove(struct device *); 107 static void sd_shutdown(struct device *); 108 static int sd_suspend_system(struct device *); 109 static int sd_suspend_runtime(struct device *); 110 static int sd_resume(struct device *); 111 static void sd_rescan(struct device *); 112 static int sd_init_command(struct scsi_cmnd *SCpnt); 113 static void sd_uninit_command(struct scsi_cmnd *SCpnt); 114 static int sd_done(struct scsi_cmnd *); 115 static int sd_eh_action(struct scsi_cmnd *, int); 116 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 117 static void scsi_disk_release(struct device *cdev); 118 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 119 static void sd_print_result(const struct scsi_disk *, const char *, int); 120 121 static DEFINE_SPINLOCK(sd_index_lock); 122 static DEFINE_IDA(sd_index_ida); 123 124 /* This semaphore is used to mediate the 0->1 reference get in the 125 * face of object destruction (i.e. we can't allow a get on an 126 * object after last put) */ 127 static DEFINE_MUTEX(sd_ref_mutex); 128 129 static struct kmem_cache *sd_cdb_cache; 130 static mempool_t *sd_cdb_pool; 131 132 static const char *sd_cache_types[] = { 133 "write through", "none", "write back", 134 "write back, no read (daft)" 135 }; 136 137 static void sd_set_flush_flag(struct scsi_disk *sdkp) 138 { 139 unsigned flush = 0; 140 141 if (sdkp->WCE) { 142 flush |= REQ_FLUSH; 143 if (sdkp->DPOFUA) 144 flush |= REQ_FUA; 145 } 146 147 blk_queue_flush(sdkp->disk->queue, flush); 148 } 149 150 static ssize_t 151 cache_type_store(struct device *dev, struct device_attribute *attr, 152 const char *buf, size_t count) 153 { 154 int i, ct = -1, rcd, wce, sp; 155 struct scsi_disk *sdkp = to_scsi_disk(dev); 156 struct scsi_device *sdp = sdkp->device; 157 char buffer[64]; 158 char *buffer_data; 159 struct scsi_mode_data data; 160 struct scsi_sense_hdr sshdr; 161 static const char temp[] = "temporary "; 162 int len; 163 164 if (sdp->type != TYPE_DISK) 165 /* no cache control on RBC devices; theoretically they 166 * can do it, but there's probably so many exceptions 167 * it's not worth the risk */ 168 return -EINVAL; 169 170 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { 171 buf += sizeof(temp) - 1; 172 sdkp->cache_override = 1; 173 } else { 174 sdkp->cache_override = 0; 175 } 176 177 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 178 len = strlen(sd_cache_types[i]); 179 if (strncmp(sd_cache_types[i], buf, len) == 0 && 180 buf[len] == '\n') { 181 ct = i; 182 break; 183 } 184 } 185 if (ct < 0) 186 return -EINVAL; 187 rcd = ct & 0x01 ? 1 : 0; 188 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0; 189 190 if (sdkp->cache_override) { 191 sdkp->WCE = wce; 192 sdkp->RCD = rcd; 193 sd_set_flush_flag(sdkp); 194 return count; 195 } 196 197 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 198 SD_MAX_RETRIES, &data, NULL)) 199 return -EINVAL; 200 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 201 data.block_descriptor_length); 202 buffer_data = buffer + data.header_length + 203 data.block_descriptor_length; 204 buffer_data[2] &= ~0x05; 205 buffer_data[2] |= wce << 2 | rcd; 206 sp = buffer_data[0] & 0x80 ? 1 : 0; 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 snprintf(buf, 20, "%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 snprintf(buf, 40, "%d\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) 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 snprintf(buf, 40, "%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 snprintf(buf, 20, "%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 snprintf(buf, 20, "%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 >= 0 && val <= SD_DIF_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, SD_DIF_TYPE0_PROTECTION)) { 334 dif = 0; 335 dix = 1; 336 } 337 338 if (!dif && !dix) 339 return snprintf(buf, 20, "none\n"); 340 341 return snprintf(buf, 20, "%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 snprintf(buf, 20, "%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 snprintf(buf, 20, "%u\n", sdkp->lbpme); 361 } 362 static DEVICE_ATTR_RO(thin_provisioning); 363 364 static const char *lbp_mode[] = { 365 [SD_LBP_FULL] = "full", 366 [SD_LBP_UNMAP] = "unmap", 367 [SD_LBP_WS16] = "writesame_16", 368 [SD_LBP_WS10] = "writesame_10", 369 [SD_LBP_ZERO] = "writesame_zero", 370 [SD_LBP_DISABLE] = "disabled", 371 }; 372 373 static ssize_t 374 provisioning_mode_show(struct device *dev, struct device_attribute *attr, 375 char *buf) 376 { 377 struct scsi_disk *sdkp = to_scsi_disk(dev); 378 379 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]); 380 } 381 382 static ssize_t 383 provisioning_mode_store(struct device *dev, struct device_attribute *attr, 384 const char *buf, size_t count) 385 { 386 struct scsi_disk *sdkp = to_scsi_disk(dev); 387 struct scsi_device *sdp = sdkp->device; 388 389 if (!capable(CAP_SYS_ADMIN)) 390 return -EACCES; 391 392 if (sdp->type != TYPE_DISK) 393 return -EINVAL; 394 395 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20)) 396 sd_config_discard(sdkp, SD_LBP_UNMAP); 397 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20)) 398 sd_config_discard(sdkp, SD_LBP_WS16); 399 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20)) 400 sd_config_discard(sdkp, SD_LBP_WS10); 401 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20)) 402 sd_config_discard(sdkp, SD_LBP_ZERO); 403 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20)) 404 sd_config_discard(sdkp, SD_LBP_DISABLE); 405 else 406 return -EINVAL; 407 408 return count; 409 } 410 static DEVICE_ATTR_RW(provisioning_mode); 411 412 static ssize_t 413 max_medium_access_timeouts_show(struct device *dev, 414 struct device_attribute *attr, char *buf) 415 { 416 struct scsi_disk *sdkp = to_scsi_disk(dev); 417 418 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts); 419 } 420 421 static ssize_t 422 max_medium_access_timeouts_store(struct device *dev, 423 struct device_attribute *attr, const char *buf, 424 size_t count) 425 { 426 struct scsi_disk *sdkp = to_scsi_disk(dev); 427 int err; 428 429 if (!capable(CAP_SYS_ADMIN)) 430 return -EACCES; 431 432 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); 433 434 return err ? err : count; 435 } 436 static DEVICE_ATTR_RW(max_medium_access_timeouts); 437 438 static ssize_t 439 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr, 440 char *buf) 441 { 442 struct scsi_disk *sdkp = to_scsi_disk(dev); 443 444 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks); 445 } 446 447 static ssize_t 448 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr, 449 const char *buf, size_t count) 450 { 451 struct scsi_disk *sdkp = to_scsi_disk(dev); 452 struct scsi_device *sdp = sdkp->device; 453 unsigned long max; 454 int err; 455 456 if (!capable(CAP_SYS_ADMIN)) 457 return -EACCES; 458 459 if (sdp->type != TYPE_DISK) 460 return -EINVAL; 461 462 err = kstrtoul(buf, 10, &max); 463 464 if (err) 465 return err; 466 467 if (max == 0) 468 sdp->no_write_same = 1; 469 else if (max <= SD_MAX_WS16_BLOCKS) { 470 sdp->no_write_same = 0; 471 sdkp->max_ws_blocks = max; 472 } 473 474 sd_config_write_same(sdkp); 475 476 return count; 477 } 478 static DEVICE_ATTR_RW(max_write_same_blocks); 479 480 static struct attribute *sd_disk_attrs[] = { 481 &dev_attr_cache_type.attr, 482 &dev_attr_FUA.attr, 483 &dev_attr_allow_restart.attr, 484 &dev_attr_manage_start_stop.attr, 485 &dev_attr_protection_type.attr, 486 &dev_attr_protection_mode.attr, 487 &dev_attr_app_tag_own.attr, 488 &dev_attr_thin_provisioning.attr, 489 &dev_attr_provisioning_mode.attr, 490 &dev_attr_max_write_same_blocks.attr, 491 &dev_attr_max_medium_access_timeouts.attr, 492 NULL, 493 }; 494 ATTRIBUTE_GROUPS(sd_disk); 495 496 static struct class sd_disk_class = { 497 .name = "scsi_disk", 498 .owner = THIS_MODULE, 499 .dev_release = scsi_disk_release, 500 .dev_groups = sd_disk_groups, 501 }; 502 503 static const struct dev_pm_ops sd_pm_ops = { 504 .suspend = sd_suspend_system, 505 .resume = sd_resume, 506 .poweroff = sd_suspend_system, 507 .restore = sd_resume, 508 .runtime_suspend = sd_suspend_runtime, 509 .runtime_resume = sd_resume, 510 }; 511 512 static struct scsi_driver sd_template = { 513 .gendrv = { 514 .name = "sd", 515 .owner = THIS_MODULE, 516 .probe = sd_probe, 517 .remove = sd_remove, 518 .shutdown = sd_shutdown, 519 .pm = &sd_pm_ops, 520 }, 521 .rescan = sd_rescan, 522 .init_command = sd_init_command, 523 .uninit_command = sd_uninit_command, 524 .done = sd_done, 525 .eh_action = sd_eh_action, 526 }; 527 528 /* 529 * Dummy kobj_map->probe function. 530 * The default ->probe function will call modprobe, which is 531 * pointless as this module is already loaded. 532 */ 533 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data) 534 { 535 return NULL; 536 } 537 538 /* 539 * Device no to disk mapping: 540 * 541 * major disc2 disc p1 542 * |............|.............|....|....| <- dev_t 543 * 31 20 19 8 7 4 3 0 544 * 545 * Inside a major, we have 16k disks, however mapped non- 546 * contiguously. The first 16 disks are for major0, the next 547 * ones with major1, ... Disk 256 is for major0 again, disk 272 548 * for major1, ... 549 * As we stay compatible with our numbering scheme, we can reuse 550 * the well-know SCSI majors 8, 65--71, 136--143. 551 */ 552 static int sd_major(int major_idx) 553 { 554 switch (major_idx) { 555 case 0: 556 return SCSI_DISK0_MAJOR; 557 case 1 ... 7: 558 return SCSI_DISK1_MAJOR + major_idx - 1; 559 case 8 ... 15: 560 return SCSI_DISK8_MAJOR + major_idx - 8; 561 default: 562 BUG(); 563 return 0; /* shut up gcc */ 564 } 565 } 566 567 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 568 { 569 struct scsi_disk *sdkp = NULL; 570 571 if (disk->private_data) { 572 sdkp = scsi_disk(disk); 573 if (scsi_device_get(sdkp->device) == 0) 574 get_device(&sdkp->dev); 575 else 576 sdkp = NULL; 577 } 578 return sdkp; 579 } 580 581 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 582 { 583 struct scsi_disk *sdkp; 584 585 mutex_lock(&sd_ref_mutex); 586 sdkp = __scsi_disk_get(disk); 587 mutex_unlock(&sd_ref_mutex); 588 return sdkp; 589 } 590 591 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 592 { 593 struct scsi_disk *sdkp; 594 595 mutex_lock(&sd_ref_mutex); 596 sdkp = dev_get_drvdata(dev); 597 if (sdkp) 598 sdkp = __scsi_disk_get(sdkp->disk); 599 mutex_unlock(&sd_ref_mutex); 600 return sdkp; 601 } 602 603 static void scsi_disk_put(struct scsi_disk *sdkp) 604 { 605 struct scsi_device *sdev = sdkp->device; 606 607 mutex_lock(&sd_ref_mutex); 608 put_device(&sdkp->dev); 609 scsi_device_put(sdev); 610 mutex_unlock(&sd_ref_mutex); 611 } 612 613 614 615 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd, 616 unsigned int dix, unsigned int dif) 617 { 618 struct bio *bio = scmd->request->bio; 619 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif); 620 unsigned int protect = 0; 621 622 if (dix) { /* DIX Type 0, 1, 2, 3 */ 623 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM)) 624 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM; 625 626 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 627 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK; 628 } 629 630 if (dif != SD_DIF_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */ 631 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT; 632 633 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 634 scmd->prot_flags |= SCSI_PROT_REF_CHECK; 635 } 636 637 if (dif) { /* DIX/DIF Type 1, 2, 3 */ 638 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI; 639 640 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK)) 641 protect = 3 << 5; /* Disable target PI checking */ 642 else 643 protect = 1 << 5; /* Enable target PI checking */ 644 } 645 646 scsi_set_prot_op(scmd, prot_op); 647 scsi_set_prot_type(scmd, dif); 648 scmd->prot_flags &= sd_prot_flag_mask(prot_op); 649 650 return protect; 651 } 652 653 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) 654 { 655 struct request_queue *q = sdkp->disk->queue; 656 unsigned int logical_block_size = sdkp->device->sector_size; 657 unsigned int max_blocks = 0; 658 659 q->limits.discard_zeroes_data = 0; 660 q->limits.discard_alignment = sdkp->unmap_alignment * 661 logical_block_size; 662 q->limits.discard_granularity = 663 max(sdkp->physical_block_size, 664 sdkp->unmap_granularity * logical_block_size); 665 666 sdkp->provisioning_mode = mode; 667 668 switch (mode) { 669 670 case SD_LBP_DISABLE: 671 q->limits.max_discard_sectors = 0; 672 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); 673 return; 674 675 case SD_LBP_UNMAP: 676 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 677 (u32)SD_MAX_WS16_BLOCKS); 678 break; 679 680 case SD_LBP_WS16: 681 max_blocks = min_not_zero(sdkp->max_ws_blocks, 682 (u32)SD_MAX_WS16_BLOCKS); 683 q->limits.discard_zeroes_data = sdkp->lbprz; 684 break; 685 686 case SD_LBP_WS10: 687 max_blocks = min_not_zero(sdkp->max_ws_blocks, 688 (u32)SD_MAX_WS10_BLOCKS); 689 q->limits.discard_zeroes_data = sdkp->lbprz; 690 break; 691 692 case SD_LBP_ZERO: 693 max_blocks = min_not_zero(sdkp->max_ws_blocks, 694 (u32)SD_MAX_WS10_BLOCKS); 695 q->limits.discard_zeroes_data = 1; 696 break; 697 } 698 699 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9); 700 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 701 } 702 703 /** 704 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device 705 * @sdp: scsi device to operate one 706 * @rq: Request to prepare 707 * 708 * Will issue either UNMAP or WRITE SAME(16) depending on preference 709 * indicated by target device. 710 **/ 711 static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd) 712 { 713 struct request *rq = cmd->request; 714 struct scsi_device *sdp = cmd->device; 715 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 716 sector_t sector = blk_rq_pos(rq); 717 unsigned int nr_sectors = blk_rq_sectors(rq); 718 unsigned int nr_bytes = blk_rq_bytes(rq); 719 unsigned int len; 720 int ret; 721 char *buf; 722 struct page *page; 723 724 sector >>= ilog2(sdp->sector_size) - 9; 725 nr_sectors >>= ilog2(sdp->sector_size) - 9; 726 727 page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 728 if (!page) 729 return BLKPREP_DEFER; 730 731 switch (sdkp->provisioning_mode) { 732 case SD_LBP_UNMAP: 733 buf = page_address(page); 734 735 cmd->cmd_len = 10; 736 cmd->cmnd[0] = UNMAP; 737 cmd->cmnd[8] = 24; 738 739 put_unaligned_be16(6 + 16, &buf[0]); 740 put_unaligned_be16(16, &buf[2]); 741 put_unaligned_be64(sector, &buf[8]); 742 put_unaligned_be32(nr_sectors, &buf[16]); 743 744 len = 24; 745 break; 746 747 case SD_LBP_WS16: 748 cmd->cmd_len = 16; 749 cmd->cmnd[0] = WRITE_SAME_16; 750 cmd->cmnd[1] = 0x8; /* UNMAP */ 751 put_unaligned_be64(sector, &cmd->cmnd[2]); 752 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); 753 754 len = sdkp->device->sector_size; 755 break; 756 757 case SD_LBP_WS10: 758 case SD_LBP_ZERO: 759 cmd->cmd_len = 10; 760 cmd->cmnd[0] = WRITE_SAME; 761 if (sdkp->provisioning_mode == SD_LBP_WS10) 762 cmd->cmnd[1] = 0x8; /* UNMAP */ 763 put_unaligned_be32(sector, &cmd->cmnd[2]); 764 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); 765 766 len = sdkp->device->sector_size; 767 break; 768 769 default: 770 ret = BLKPREP_KILL; 771 goto out; 772 } 773 774 rq->completion_data = page; 775 rq->timeout = SD_TIMEOUT; 776 777 cmd->transfersize = len; 778 cmd->allowed = SD_MAX_RETRIES; 779 780 /* 781 * Initially __data_len is set to the amount of data that needs to be 782 * transferred to the target. This amount depends on whether WRITE SAME 783 * or UNMAP is being used. After the scatterlist has been mapped by 784 * scsi_init_io() we set __data_len to the size of the area to be 785 * discarded on disk. This allows us to report completion on the full 786 * amount of blocks described by the request. 787 */ 788 blk_add_request_payload(rq, page, len); 789 ret = scsi_init_io(cmd); 790 rq->__data_len = nr_bytes; 791 792 out: 793 if (ret != BLKPREP_OK) 794 __free_page(page); 795 return ret; 796 } 797 798 static void sd_config_write_same(struct scsi_disk *sdkp) 799 { 800 struct request_queue *q = sdkp->disk->queue; 801 unsigned int logical_block_size = sdkp->device->sector_size; 802 803 if (sdkp->device->no_write_same) { 804 sdkp->max_ws_blocks = 0; 805 goto out; 806 } 807 808 /* Some devices can not handle block counts above 0xffff despite 809 * supporting WRITE SAME(16). Consequently we default to 64k 810 * blocks per I/O unless the device explicitly advertises a 811 * bigger limit. 812 */ 813 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) 814 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 815 (u32)SD_MAX_WS16_BLOCKS); 816 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes) 817 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 818 (u32)SD_MAX_WS10_BLOCKS); 819 else { 820 sdkp->device->no_write_same = 1; 821 sdkp->max_ws_blocks = 0; 822 } 823 824 out: 825 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks * 826 (logical_block_size >> 9)); 827 } 828 829 /** 830 * sd_setup_write_same_cmnd - write the same data to multiple blocks 831 * @cmd: command to prepare 832 * 833 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on 834 * preference indicated by target device. 835 **/ 836 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd) 837 { 838 struct request *rq = cmd->request; 839 struct scsi_device *sdp = cmd->device; 840 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 841 struct bio *bio = rq->bio; 842 sector_t sector = blk_rq_pos(rq); 843 unsigned int nr_sectors = blk_rq_sectors(rq); 844 unsigned int nr_bytes = blk_rq_bytes(rq); 845 int ret; 846 847 if (sdkp->device->no_write_same) 848 return BLKPREP_KILL; 849 850 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size); 851 852 sector >>= ilog2(sdp->sector_size) - 9; 853 nr_sectors >>= ilog2(sdp->sector_size) - 9; 854 855 rq->timeout = SD_WRITE_SAME_TIMEOUT; 856 857 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) { 858 cmd->cmd_len = 16; 859 cmd->cmnd[0] = WRITE_SAME_16; 860 put_unaligned_be64(sector, &cmd->cmnd[2]); 861 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); 862 } else { 863 cmd->cmd_len = 10; 864 cmd->cmnd[0] = WRITE_SAME; 865 put_unaligned_be32(sector, &cmd->cmnd[2]); 866 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); 867 } 868 869 cmd->transfersize = sdp->sector_size; 870 cmd->allowed = SD_MAX_RETRIES; 871 872 /* 873 * For WRITE_SAME the data transferred in the DATA IN buffer is 874 * different from the amount of data actually written to the target. 875 * 876 * We set up __data_len to the amount of data transferred from the 877 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list 878 * to transfer a single sector of data first, but then reset it to 879 * the amount of data to be written right after so that the I/O path 880 * knows how much to actually write. 881 */ 882 rq->__data_len = sdp->sector_size; 883 ret = scsi_init_io(cmd); 884 rq->__data_len = nr_bytes; 885 return ret; 886 } 887 888 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd) 889 { 890 struct request *rq = cmd->request; 891 892 /* flush requests don't perform I/O, zero the S/G table */ 893 memset(&cmd->sdb, 0, sizeof(cmd->sdb)); 894 895 cmd->cmnd[0] = SYNCHRONIZE_CACHE; 896 cmd->cmd_len = 10; 897 cmd->transfersize = 0; 898 cmd->allowed = SD_MAX_RETRIES; 899 900 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER; 901 return BLKPREP_OK; 902 } 903 904 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt) 905 { 906 struct request *rq = SCpnt->request; 907 struct scsi_device *sdp = SCpnt->device; 908 struct gendisk *disk = rq->rq_disk; 909 struct scsi_disk *sdkp; 910 sector_t block = blk_rq_pos(rq); 911 sector_t threshold; 912 unsigned int this_count = blk_rq_sectors(rq); 913 unsigned int dif, dix; 914 int ret; 915 unsigned char protect; 916 917 ret = scsi_init_io(SCpnt); 918 if (ret != BLKPREP_OK) 919 goto out; 920 SCpnt = rq->special; 921 sdkp = scsi_disk(disk); 922 923 /* from here on until we're complete, any goto out 924 * is used for a killable error condition */ 925 ret = BLKPREP_KILL; 926 927 SCSI_LOG_HLQUEUE(1, 928 scmd_printk(KERN_INFO, SCpnt, 929 "%s: block=%llu, count=%d\n", 930 __func__, (unsigned long long)block, this_count)); 931 932 if (!sdp || !scsi_device_online(sdp) || 933 block + blk_rq_sectors(rq) > get_capacity(disk)) { 934 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 935 "Finishing %u sectors\n", 936 blk_rq_sectors(rq))); 937 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 938 "Retry with 0x%p\n", SCpnt)); 939 goto out; 940 } 941 942 if (sdp->changed) { 943 /* 944 * quietly refuse to do anything to a changed disc until 945 * the changed bit has been reset 946 */ 947 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ 948 goto out; 949 } 950 951 /* 952 * Some SD card readers can't handle multi-sector accesses which touch 953 * the last one or two hardware sectors. Split accesses as needed. 954 */ 955 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 956 (sdp->sector_size / 512); 957 958 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 959 if (block < threshold) { 960 /* Access up to the threshold but not beyond */ 961 this_count = threshold - block; 962 } else { 963 /* Access only a single hardware sector */ 964 this_count = sdp->sector_size / 512; 965 } 966 } 967 968 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 969 (unsigned long long)block)); 970 971 /* 972 * If we have a 1K hardware sectorsize, prevent access to single 973 * 512 byte sectors. In theory we could handle this - in fact 974 * the scsi cdrom driver must be able to handle this because 975 * we typically use 1K blocksizes, and cdroms typically have 976 * 2K hardware sectorsizes. Of course, things are simpler 977 * with the cdrom, since it is read-only. For performance 978 * reasons, the filesystems should be able to handle this 979 * and not force the scsi disk driver to use bounce buffers 980 * for this. 981 */ 982 if (sdp->sector_size == 1024) { 983 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 984 scmd_printk(KERN_ERR, SCpnt, 985 "Bad block number requested\n"); 986 goto out; 987 } else { 988 block = block >> 1; 989 this_count = this_count >> 1; 990 } 991 } 992 if (sdp->sector_size == 2048) { 993 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 994 scmd_printk(KERN_ERR, SCpnt, 995 "Bad block number requested\n"); 996 goto out; 997 } else { 998 block = block >> 2; 999 this_count = this_count >> 2; 1000 } 1001 } 1002 if (sdp->sector_size == 4096) { 1003 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 1004 scmd_printk(KERN_ERR, SCpnt, 1005 "Bad block number requested\n"); 1006 goto out; 1007 } else { 1008 block = block >> 3; 1009 this_count = this_count >> 3; 1010 } 1011 } 1012 if (rq_data_dir(rq) == WRITE) { 1013 SCpnt->cmnd[0] = WRITE_6; 1014 1015 if (blk_integrity_rq(rq)) 1016 sd_dif_prepare(SCpnt); 1017 1018 } else if (rq_data_dir(rq) == READ) { 1019 SCpnt->cmnd[0] = READ_6; 1020 } else { 1021 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags); 1022 goto out; 1023 } 1024 1025 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 1026 "%s %d/%u 512 byte blocks.\n", 1027 (rq_data_dir(rq) == WRITE) ? 1028 "writing" : "reading", this_count, 1029 blk_rq_sectors(rq))); 1030 1031 dix = scsi_prot_sg_count(SCpnt); 1032 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type); 1033 1034 if (dif || dix) 1035 protect = sd_setup_protect_cmnd(SCpnt, dix, dif); 1036 else 1037 protect = 0; 1038 1039 if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) { 1040 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 1041 1042 if (unlikely(SCpnt->cmnd == NULL)) { 1043 ret = BLKPREP_DEFER; 1044 goto out; 1045 } 1046 1047 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 1048 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 1049 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 1050 SCpnt->cmnd[7] = 0x18; 1051 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 1052 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1053 1054 /* LBA */ 1055 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1056 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1057 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1058 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1059 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 1060 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 1061 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 1062 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 1063 1064 /* Expected Indirect LBA */ 1065 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 1066 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 1067 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 1068 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 1069 1070 /* Transfer length */ 1071 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 1072 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 1073 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 1074 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 1075 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) { 1076 SCpnt->cmnd[0] += READ_16 - READ_6; 1077 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1078 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1079 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1080 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1081 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1082 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 1083 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 1084 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 1085 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 1086 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 1087 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 1088 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 1089 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 1090 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 1091 } else if ((this_count > 0xff) || (block > 0x1fffff) || 1092 scsi_device_protection(SCpnt->device) || 1093 SCpnt->device->use_10_for_rw) { 1094 SCpnt->cmnd[0] += READ_10 - READ_6; 1095 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1096 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 1097 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 1098 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 1099 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 1100 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 1101 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 1102 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 1103 } else { 1104 if (unlikely(rq->cmd_flags & REQ_FUA)) { 1105 /* 1106 * This happens only if this drive failed 1107 * 10byte rw command with ILLEGAL_REQUEST 1108 * during operation and thus turned off 1109 * use_10_for_rw. 1110 */ 1111 scmd_printk(KERN_ERR, SCpnt, 1112 "FUA write on READ/WRITE(6) drive\n"); 1113 goto out; 1114 } 1115 1116 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 1117 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 1118 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 1119 SCpnt->cmnd[4] = (unsigned char) this_count; 1120 SCpnt->cmnd[5] = 0; 1121 } 1122 SCpnt->sdb.length = this_count * sdp->sector_size; 1123 1124 /* 1125 * We shouldn't disconnect in the middle of a sector, so with a dumb 1126 * host adapter, it's safe to assume that we can at least transfer 1127 * this many bytes between each connect / disconnect. 1128 */ 1129 SCpnt->transfersize = sdp->sector_size; 1130 SCpnt->underflow = this_count << 9; 1131 SCpnt->allowed = SD_MAX_RETRIES; 1132 1133 /* 1134 * This indicates that the command is ready from our end to be 1135 * queued. 1136 */ 1137 ret = BLKPREP_OK; 1138 out: 1139 return ret; 1140 } 1141 1142 static int sd_init_command(struct scsi_cmnd *cmd) 1143 { 1144 struct request *rq = cmd->request; 1145 1146 if (rq->cmd_flags & REQ_DISCARD) 1147 return sd_setup_discard_cmnd(cmd); 1148 else if (rq->cmd_flags & REQ_WRITE_SAME) 1149 return sd_setup_write_same_cmnd(cmd); 1150 else if (rq->cmd_flags & REQ_FLUSH) 1151 return sd_setup_flush_cmnd(cmd); 1152 else 1153 return sd_setup_read_write_cmnd(cmd); 1154 } 1155 1156 static void sd_uninit_command(struct scsi_cmnd *SCpnt) 1157 { 1158 struct request *rq = SCpnt->request; 1159 1160 if (rq->cmd_flags & REQ_DISCARD) 1161 __free_page(rq->completion_data); 1162 1163 if (SCpnt->cmnd != rq->cmd) { 1164 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1165 SCpnt->cmnd = NULL; 1166 SCpnt->cmd_len = 0; 1167 } 1168 } 1169 1170 /** 1171 * sd_open - open a scsi disk device 1172 * @inode: only i_rdev member may be used 1173 * @filp: only f_mode and f_flags may be used 1174 * 1175 * Returns 0 if successful. Returns a negated errno value in case 1176 * of error. 1177 * 1178 * Note: This can be called from a user context (e.g. fsck(1) ) 1179 * or from within the kernel (e.g. as a result of a mount(1) ). 1180 * In the latter case @inode and @filp carry an abridged amount 1181 * of information as noted above. 1182 * 1183 * Locking: called with bdev->bd_mutex held. 1184 **/ 1185 static int sd_open(struct block_device *bdev, fmode_t mode) 1186 { 1187 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 1188 struct scsi_device *sdev; 1189 int retval; 1190 1191 if (!sdkp) 1192 return -ENXIO; 1193 1194 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 1195 1196 sdev = sdkp->device; 1197 1198 /* 1199 * If the device is in error recovery, wait until it is done. 1200 * If the device is offline, then disallow any access to it. 1201 */ 1202 retval = -ENXIO; 1203 if (!scsi_block_when_processing_errors(sdev)) 1204 goto error_out; 1205 1206 if (sdev->removable || sdkp->write_prot) 1207 check_disk_change(bdev); 1208 1209 /* 1210 * If the drive is empty, just let the open fail. 1211 */ 1212 retval = -ENOMEDIUM; 1213 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 1214 goto error_out; 1215 1216 /* 1217 * If the device has the write protect tab set, have the open fail 1218 * if the user expects to be able to write to the thing. 1219 */ 1220 retval = -EROFS; 1221 if (sdkp->write_prot && (mode & FMODE_WRITE)) 1222 goto error_out; 1223 1224 /* 1225 * It is possible that the disk changing stuff resulted in 1226 * the device being taken offline. If this is the case, 1227 * report this to the user, and don't pretend that the 1228 * open actually succeeded. 1229 */ 1230 retval = -ENXIO; 1231 if (!scsi_device_online(sdev)) 1232 goto error_out; 1233 1234 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 1235 if (scsi_block_when_processing_errors(sdev)) 1236 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 1237 } 1238 1239 return 0; 1240 1241 error_out: 1242 scsi_disk_put(sdkp); 1243 return retval; 1244 } 1245 1246 /** 1247 * sd_release - invoked when the (last) close(2) is called on this 1248 * scsi disk. 1249 * @inode: only i_rdev member may be used 1250 * @filp: only f_mode and f_flags may be used 1251 * 1252 * Returns 0. 1253 * 1254 * Note: may block (uninterruptible) if error recovery is underway 1255 * on this disk. 1256 * 1257 * Locking: called with bdev->bd_mutex held. 1258 **/ 1259 static void sd_release(struct gendisk *disk, fmode_t mode) 1260 { 1261 struct scsi_disk *sdkp = scsi_disk(disk); 1262 struct scsi_device *sdev = sdkp->device; 1263 1264 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 1265 1266 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 1267 if (scsi_block_when_processing_errors(sdev)) 1268 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 1269 } 1270 1271 /* 1272 * XXX and what if there are packets in flight and this close() 1273 * XXX is followed by a "rmmod sd_mod"? 1274 */ 1275 1276 scsi_disk_put(sdkp); 1277 } 1278 1279 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1280 { 1281 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 1282 struct scsi_device *sdp = sdkp->device; 1283 struct Scsi_Host *host = sdp->host; 1284 int diskinfo[4]; 1285 1286 /* default to most commonly used values */ 1287 diskinfo[0] = 0x40; /* 1 << 6 */ 1288 diskinfo[1] = 0x20; /* 1 << 5 */ 1289 diskinfo[2] = sdkp->capacity >> 11; 1290 1291 /* override with calculated, extended default, or driver values */ 1292 if (host->hostt->bios_param) 1293 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 1294 else 1295 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 1296 1297 geo->heads = diskinfo[0]; 1298 geo->sectors = diskinfo[1]; 1299 geo->cylinders = diskinfo[2]; 1300 return 0; 1301 } 1302 1303 /** 1304 * sd_ioctl - process an ioctl 1305 * @inode: only i_rdev/i_bdev members may be used 1306 * @filp: only f_mode and f_flags may be used 1307 * @cmd: ioctl command number 1308 * @arg: this is third argument given to ioctl(2) system call. 1309 * Often contains a pointer. 1310 * 1311 * Returns 0 if successful (some ioctls return positive numbers on 1312 * success as well). Returns a negated errno value in case of error. 1313 * 1314 * Note: most ioctls are forward onto the block subsystem or further 1315 * down in the scsi subsystem. 1316 **/ 1317 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 1318 unsigned int cmd, unsigned long arg) 1319 { 1320 struct gendisk *disk = bdev->bd_disk; 1321 struct scsi_disk *sdkp = scsi_disk(disk); 1322 struct scsi_device *sdp = sdkp->device; 1323 void __user *p = (void __user *)arg; 1324 int error; 1325 1326 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " 1327 "cmd=0x%x\n", disk->disk_name, cmd)); 1328 1329 error = scsi_verify_blk_ioctl(bdev, cmd); 1330 if (error < 0) 1331 return error; 1332 1333 /* 1334 * If we are in the middle of error recovery, don't let anyone 1335 * else try and use this device. Also, if error recovery fails, it 1336 * may try and take the device offline, in which case all further 1337 * access to the device is prohibited. 1338 */ 1339 error = scsi_ioctl_block_when_processing_errors(sdp, cmd, 1340 (mode & FMODE_NDELAY) != 0); 1341 if (error) 1342 goto out; 1343 1344 /* 1345 * Send SCSI addressing ioctls directly to mid level, send other 1346 * ioctls to block level and then onto mid level if they can't be 1347 * resolved. 1348 */ 1349 switch (cmd) { 1350 case SCSI_IOCTL_GET_IDLUN: 1351 case SCSI_IOCTL_GET_BUS_NUMBER: 1352 error = scsi_ioctl(sdp, cmd, p); 1353 break; 1354 default: 1355 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); 1356 if (error != -ENOTTY) 1357 break; 1358 error = scsi_ioctl(sdp, cmd, p); 1359 break; 1360 } 1361 out: 1362 return error; 1363 } 1364 1365 static void set_media_not_present(struct scsi_disk *sdkp) 1366 { 1367 if (sdkp->media_present) 1368 sdkp->device->changed = 1; 1369 1370 if (sdkp->device->removable) { 1371 sdkp->media_present = 0; 1372 sdkp->capacity = 0; 1373 } 1374 } 1375 1376 static int media_not_present(struct scsi_disk *sdkp, 1377 struct scsi_sense_hdr *sshdr) 1378 { 1379 if (!scsi_sense_valid(sshdr)) 1380 return 0; 1381 1382 /* not invoked for commands that could return deferred errors */ 1383 switch (sshdr->sense_key) { 1384 case UNIT_ATTENTION: 1385 case NOT_READY: 1386 /* medium not present */ 1387 if (sshdr->asc == 0x3A) { 1388 set_media_not_present(sdkp); 1389 return 1; 1390 } 1391 } 1392 return 0; 1393 } 1394 1395 /** 1396 * sd_check_events - check media events 1397 * @disk: kernel device descriptor 1398 * @clearing: disk events currently being cleared 1399 * 1400 * Returns mask of DISK_EVENT_*. 1401 * 1402 * Note: this function is invoked from the block subsystem. 1403 **/ 1404 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) 1405 { 1406 struct scsi_disk *sdkp = scsi_disk(disk); 1407 struct scsi_device *sdp = sdkp->device; 1408 struct scsi_sense_hdr *sshdr = NULL; 1409 int retval; 1410 1411 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); 1412 1413 /* 1414 * If the device is offline, don't send any commands - just pretend as 1415 * if the command failed. If the device ever comes back online, we 1416 * can deal with it then. It is only because of unrecoverable errors 1417 * that we would ever take a device offline in the first place. 1418 */ 1419 if (!scsi_device_online(sdp)) { 1420 set_media_not_present(sdkp); 1421 goto out; 1422 } 1423 1424 /* 1425 * Using TEST_UNIT_READY enables differentiation between drive with 1426 * no cartridge loaded - NOT READY, drive with changed cartridge - 1427 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1428 * 1429 * Drives that auto spin down. eg iomega jaz 1G, will be started 1430 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1431 * sd_revalidate() is called. 1432 */ 1433 retval = -ENODEV; 1434 1435 if (scsi_block_when_processing_errors(sdp)) { 1436 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 1437 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1438 sshdr); 1439 } 1440 1441 /* failed to execute TUR, assume media not present */ 1442 if (host_byte(retval)) { 1443 set_media_not_present(sdkp); 1444 goto out; 1445 } 1446 1447 if (media_not_present(sdkp, sshdr)) 1448 goto out; 1449 1450 /* 1451 * For removable scsi disk we have to recognise the presence 1452 * of a disk in the drive. 1453 */ 1454 if (!sdkp->media_present) 1455 sdp->changed = 1; 1456 sdkp->media_present = 1; 1457 out: 1458 /* 1459 * sdp->changed is set under the following conditions: 1460 * 1461 * Medium present state has changed in either direction. 1462 * Device has indicated UNIT_ATTENTION. 1463 */ 1464 kfree(sshdr); 1465 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1466 sdp->changed = 0; 1467 return retval; 1468 } 1469 1470 static int sd_sync_cache(struct scsi_disk *sdkp) 1471 { 1472 int retries, res; 1473 struct scsi_device *sdp = sdkp->device; 1474 const int timeout = sdp->request_queue->rq_timeout 1475 * SD_FLUSH_TIMEOUT_MULTIPLIER; 1476 struct scsi_sense_hdr sshdr; 1477 1478 if (!scsi_device_online(sdp)) 1479 return -ENODEV; 1480 1481 for (retries = 3; retries > 0; --retries) { 1482 unsigned char cmd[10] = { 0 }; 1483 1484 cmd[0] = SYNCHRONIZE_CACHE; 1485 /* 1486 * Leave the rest of the command zero to indicate 1487 * flush everything. 1488 */ 1489 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, 1490 &sshdr, timeout, SD_MAX_RETRIES, 1491 NULL, REQ_PM); 1492 if (res == 0) 1493 break; 1494 } 1495 1496 if (res) { 1497 sd_print_result(sdkp, "Synchronize Cache(10) failed", res); 1498 1499 if (driver_byte(res) & DRIVER_SENSE) 1500 sd_print_sense_hdr(sdkp, &sshdr); 1501 /* we need to evaluate the error return */ 1502 if (scsi_sense_valid(&sshdr) && 1503 (sshdr.asc == 0x3a || /* medium not present */ 1504 sshdr.asc == 0x20)) /* invalid command */ 1505 /* this is no error here */ 1506 return 0; 1507 1508 switch (host_byte(res)) { 1509 /* ignore errors due to racing a disconnection */ 1510 case DID_BAD_TARGET: 1511 case DID_NO_CONNECT: 1512 return 0; 1513 /* signal the upper layer it might try again */ 1514 case DID_BUS_BUSY: 1515 case DID_IMM_RETRY: 1516 case DID_REQUEUE: 1517 case DID_SOFT_ERROR: 1518 return -EBUSY; 1519 default: 1520 return -EIO; 1521 } 1522 } 1523 return 0; 1524 } 1525 1526 static void sd_rescan(struct device *dev) 1527 { 1528 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1529 1530 if (sdkp) { 1531 revalidate_disk(sdkp->disk); 1532 scsi_disk_put(sdkp); 1533 } 1534 } 1535 1536 1537 #ifdef CONFIG_COMPAT 1538 /* 1539 * This gets directly called from VFS. When the ioctl 1540 * is not recognized we go back to the other translation paths. 1541 */ 1542 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1543 unsigned int cmd, unsigned long arg) 1544 { 1545 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1546 int error; 1547 1548 error = scsi_ioctl_block_when_processing_errors(sdev, cmd, 1549 (mode & FMODE_NDELAY) != 0); 1550 if (error) 1551 return error; 1552 1553 /* 1554 * Let the static ioctl translation table take care of it. 1555 */ 1556 if (!sdev->host->hostt->compat_ioctl) 1557 return -ENOIOCTLCMD; 1558 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1559 } 1560 #endif 1561 1562 static const struct block_device_operations sd_fops = { 1563 .owner = THIS_MODULE, 1564 .open = sd_open, 1565 .release = sd_release, 1566 .ioctl = sd_ioctl, 1567 .getgeo = sd_getgeo, 1568 #ifdef CONFIG_COMPAT 1569 .compat_ioctl = sd_compat_ioctl, 1570 #endif 1571 .check_events = sd_check_events, 1572 .revalidate_disk = sd_revalidate_disk, 1573 .unlock_native_capacity = sd_unlock_native_capacity, 1574 }; 1575 1576 /** 1577 * sd_eh_action - error handling callback 1578 * @scmd: sd-issued command that has failed 1579 * @eh_disp: The recovery disposition suggested by the midlayer 1580 * 1581 * This function is called by the SCSI midlayer upon completion of an 1582 * error test command (currently TEST UNIT READY). The result of sending 1583 * the eh command is passed in eh_disp. We're looking for devices that 1584 * fail medium access commands but are OK with non access commands like 1585 * test unit ready (so wrongly see the device as having a successful 1586 * recovery) 1587 **/ 1588 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp) 1589 { 1590 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1591 1592 if (!scsi_device_online(scmd->device) || 1593 !scsi_medium_access_command(scmd) || 1594 host_byte(scmd->result) != DID_TIME_OUT || 1595 eh_disp != SUCCESS) 1596 return eh_disp; 1597 1598 /* 1599 * The device has timed out executing a medium access command. 1600 * However, the TEST UNIT READY command sent during error 1601 * handling completed successfully. Either the device is in the 1602 * process of recovering or has it suffered an internal failure 1603 * that prevents access to the storage medium. 1604 */ 1605 sdkp->medium_access_timed_out++; 1606 1607 /* 1608 * If the device keeps failing read/write commands but TEST UNIT 1609 * READY always completes successfully we assume that medium 1610 * access is no longer possible and take the device offline. 1611 */ 1612 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { 1613 scmd_printk(KERN_ERR, scmd, 1614 "Medium access timeout failure. Offlining disk!\n"); 1615 scsi_device_set_state(scmd->device, SDEV_OFFLINE); 1616 1617 return FAILED; 1618 } 1619 1620 return eh_disp; 1621 } 1622 1623 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1624 { 1625 u64 start_lba = blk_rq_pos(scmd->request); 1626 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1627 u64 bad_lba; 1628 int info_valid; 1629 /* 1630 * resid is optional but mostly filled in. When it's unused, 1631 * its value is zero, so we assume the whole buffer transferred 1632 */ 1633 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 1634 unsigned int good_bytes; 1635 1636 if (scmd->request->cmd_type != REQ_TYPE_FS) 1637 return 0; 1638 1639 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1640 SCSI_SENSE_BUFFERSIZE, 1641 &bad_lba); 1642 if (!info_valid) 1643 return 0; 1644 1645 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1646 return 0; 1647 1648 if (scmd->device->sector_size < 512) { 1649 /* only legitimate sector_size here is 256 */ 1650 start_lba <<= 1; 1651 end_lba <<= 1; 1652 } else { 1653 /* be careful ... don't want any overflows */ 1654 unsigned int factor = scmd->device->sector_size / 512; 1655 do_div(start_lba, factor); 1656 do_div(end_lba, factor); 1657 } 1658 1659 /* The bad lba was reported incorrectly, we have no idea where 1660 * the error is. 1661 */ 1662 if (bad_lba < start_lba || bad_lba >= end_lba) 1663 return 0; 1664 1665 /* This computation should always be done in terms of 1666 * the resolution of the device's medium. 1667 */ 1668 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; 1669 return min(good_bytes, transferred); 1670 } 1671 1672 /** 1673 * sd_done - bottom half handler: called when the lower level 1674 * driver has completed (successfully or otherwise) a scsi command. 1675 * @SCpnt: mid-level's per command structure. 1676 * 1677 * Note: potentially run from within an ISR. Must not block. 1678 **/ 1679 static int sd_done(struct scsi_cmnd *SCpnt) 1680 { 1681 int result = SCpnt->result; 1682 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1683 struct scsi_sense_hdr sshdr; 1684 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1685 struct request *req = SCpnt->request; 1686 int sense_valid = 0; 1687 int sense_deferred = 0; 1688 unsigned char op = SCpnt->cmnd[0]; 1689 unsigned char unmap = SCpnt->cmnd[1] & 8; 1690 1691 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) { 1692 if (!result) { 1693 good_bytes = blk_rq_bytes(req); 1694 scsi_set_resid(SCpnt, 0); 1695 } else { 1696 good_bytes = 0; 1697 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 1698 } 1699 } 1700 1701 if (result) { 1702 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1703 if (sense_valid) 1704 sense_deferred = scsi_sense_is_deferred(&sshdr); 1705 } 1706 sdkp->medium_access_timed_out = 0; 1707 1708 if (driver_byte(result) != DRIVER_SENSE && 1709 (!sense_valid || sense_deferred)) 1710 goto out; 1711 1712 switch (sshdr.sense_key) { 1713 case HARDWARE_ERROR: 1714 case MEDIUM_ERROR: 1715 good_bytes = sd_completed_bytes(SCpnt); 1716 break; 1717 case RECOVERED_ERROR: 1718 good_bytes = scsi_bufflen(SCpnt); 1719 break; 1720 case NO_SENSE: 1721 /* This indicates a false check condition, so ignore it. An 1722 * unknown amount of data was transferred so treat it as an 1723 * error. 1724 */ 1725 SCpnt->result = 0; 1726 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1727 break; 1728 case ABORTED_COMMAND: 1729 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 1730 good_bytes = sd_completed_bytes(SCpnt); 1731 break; 1732 case ILLEGAL_REQUEST: 1733 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */ 1734 good_bytes = sd_completed_bytes(SCpnt); 1735 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ 1736 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) { 1737 switch (op) { 1738 case UNMAP: 1739 sd_config_discard(sdkp, SD_LBP_DISABLE); 1740 break; 1741 case WRITE_SAME_16: 1742 case WRITE_SAME: 1743 if (unmap) 1744 sd_config_discard(sdkp, SD_LBP_DISABLE); 1745 else { 1746 sdkp->device->no_write_same = 1; 1747 sd_config_write_same(sdkp); 1748 1749 good_bytes = 0; 1750 req->__data_len = blk_rq_bytes(req); 1751 req->cmd_flags |= REQ_QUIET; 1752 } 1753 } 1754 } 1755 break; 1756 default: 1757 break; 1758 } 1759 out: 1760 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1761 "sd_done: completed %d of %d bytes\n", 1762 good_bytes, scsi_bufflen(SCpnt))); 1763 1764 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1765 sd_dif_complete(SCpnt, good_bytes); 1766 1767 return good_bytes; 1768 } 1769 1770 /* 1771 * spinup disk - called only in sd_revalidate_disk() 1772 */ 1773 static void 1774 sd_spinup_disk(struct scsi_disk *sdkp) 1775 { 1776 unsigned char cmd[10]; 1777 unsigned long spintime_expire = 0; 1778 int retries, spintime; 1779 unsigned int the_result; 1780 struct scsi_sense_hdr sshdr; 1781 int sense_valid = 0; 1782 1783 spintime = 0; 1784 1785 /* Spin up drives, as required. Only do this at boot time */ 1786 /* Spinup needs to be done for module loads too. */ 1787 do { 1788 retries = 0; 1789 1790 do { 1791 cmd[0] = TEST_UNIT_READY; 1792 memset((void *) &cmd[1], 0, 9); 1793 1794 the_result = scsi_execute_req(sdkp->device, cmd, 1795 DMA_NONE, NULL, 0, 1796 &sshdr, SD_TIMEOUT, 1797 SD_MAX_RETRIES, NULL); 1798 1799 /* 1800 * If the drive has indicated to us that it 1801 * doesn't have any media in it, don't bother 1802 * with any more polling. 1803 */ 1804 if (media_not_present(sdkp, &sshdr)) 1805 return; 1806 1807 if (the_result) 1808 sense_valid = scsi_sense_valid(&sshdr); 1809 retries++; 1810 } while (retries < 3 && 1811 (!scsi_status_is_good(the_result) || 1812 ((driver_byte(the_result) & DRIVER_SENSE) && 1813 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1814 1815 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1816 /* no sense, TUR either succeeded or failed 1817 * with a status error */ 1818 if(!spintime && !scsi_status_is_good(the_result)) { 1819 sd_print_result(sdkp, "Test Unit Ready failed", 1820 the_result); 1821 } 1822 break; 1823 } 1824 1825 /* 1826 * The device does not want the automatic start to be issued. 1827 */ 1828 if (sdkp->device->no_start_on_add) 1829 break; 1830 1831 if (sense_valid && sshdr.sense_key == NOT_READY) { 1832 if (sshdr.asc == 4 && sshdr.ascq == 3) 1833 break; /* manual intervention required */ 1834 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1835 break; /* standby */ 1836 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1837 break; /* unavailable */ 1838 /* 1839 * Issue command to spin up drive when not ready 1840 */ 1841 if (!spintime) { 1842 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1843 cmd[0] = START_STOP; 1844 cmd[1] = 1; /* Return immediately */ 1845 memset((void *) &cmd[2], 0, 8); 1846 cmd[4] = 1; /* Start spin cycle */ 1847 if (sdkp->device->start_stop_pwr_cond) 1848 cmd[4] |= 1 << 4; 1849 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1850 NULL, 0, &sshdr, 1851 SD_TIMEOUT, SD_MAX_RETRIES, 1852 NULL); 1853 spintime_expire = jiffies + 100 * HZ; 1854 spintime = 1; 1855 } 1856 /* Wait 1 second for next try */ 1857 msleep(1000); 1858 printk("."); 1859 1860 /* 1861 * Wait for USB flash devices with slow firmware. 1862 * Yes, this sense key/ASC combination shouldn't 1863 * occur here. It's characteristic of these devices. 1864 */ 1865 } else if (sense_valid && 1866 sshdr.sense_key == UNIT_ATTENTION && 1867 sshdr.asc == 0x28) { 1868 if (!spintime) { 1869 spintime_expire = jiffies + 5 * HZ; 1870 spintime = 1; 1871 } 1872 /* Wait 1 second for next try */ 1873 msleep(1000); 1874 } else { 1875 /* we don't understand the sense code, so it's 1876 * probably pointless to loop */ 1877 if(!spintime) { 1878 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1879 sd_print_sense_hdr(sdkp, &sshdr); 1880 } 1881 break; 1882 } 1883 1884 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1885 1886 if (spintime) { 1887 if (scsi_status_is_good(the_result)) 1888 printk("ready\n"); 1889 else 1890 printk("not responding...\n"); 1891 } 1892 } 1893 1894 1895 /* 1896 * Determine whether disk supports Data Integrity Field. 1897 */ 1898 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1899 { 1900 struct scsi_device *sdp = sdkp->device; 1901 u8 type; 1902 int ret = 0; 1903 1904 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1905 return ret; 1906 1907 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1908 1909 if (type > SD_DIF_TYPE3_PROTECTION) 1910 ret = -ENODEV; 1911 else if (scsi_host_dif_capable(sdp->host, type)) 1912 ret = 1; 1913 1914 if (sdkp->first_scan || type != sdkp->protection_type) 1915 switch (ret) { 1916 case -ENODEV: 1917 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ 1918 " protection type %u. Disabling disk!\n", 1919 type); 1920 break; 1921 case 1: 1922 sd_printk(KERN_NOTICE, sdkp, 1923 "Enabling DIF Type %u protection\n", type); 1924 break; 1925 case 0: 1926 sd_printk(KERN_NOTICE, sdkp, 1927 "Disabling DIF Type %u protection\n", type); 1928 break; 1929 } 1930 1931 sdkp->protection_type = type; 1932 1933 return ret; 1934 } 1935 1936 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1937 struct scsi_sense_hdr *sshdr, int sense_valid, 1938 int the_result) 1939 { 1940 if (driver_byte(the_result) & DRIVER_SENSE) 1941 sd_print_sense_hdr(sdkp, sshdr); 1942 else 1943 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1944 1945 /* 1946 * Set dirty bit for removable devices if not ready - 1947 * sometimes drives will not report this properly. 1948 */ 1949 if (sdp->removable && 1950 sense_valid && sshdr->sense_key == NOT_READY) 1951 set_media_not_present(sdkp); 1952 1953 /* 1954 * We used to set media_present to 0 here to indicate no media 1955 * in the drive, but some drives fail read capacity even with 1956 * media present, so we can't do that. 1957 */ 1958 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1959 } 1960 1961 #define RC16_LEN 32 1962 #if RC16_LEN > SD_BUF_SIZE 1963 #error RC16_LEN must not be more than SD_BUF_SIZE 1964 #endif 1965 1966 #define READ_CAPACITY_RETRIES_ON_RESET 10 1967 1968 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1969 unsigned char *buffer) 1970 { 1971 unsigned char cmd[16]; 1972 struct scsi_sense_hdr sshdr; 1973 int sense_valid = 0; 1974 int the_result; 1975 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1976 unsigned int alignment; 1977 unsigned long long lba; 1978 unsigned sector_size; 1979 1980 if (sdp->no_read_capacity_16) 1981 return -EINVAL; 1982 1983 do { 1984 memset(cmd, 0, 16); 1985 cmd[0] = SERVICE_ACTION_IN_16; 1986 cmd[1] = SAI_READ_CAPACITY_16; 1987 cmd[13] = RC16_LEN; 1988 memset(buffer, 0, RC16_LEN); 1989 1990 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1991 buffer, RC16_LEN, &sshdr, 1992 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1993 1994 if (media_not_present(sdkp, &sshdr)) 1995 return -ENODEV; 1996 1997 if (the_result) { 1998 sense_valid = scsi_sense_valid(&sshdr); 1999 if (sense_valid && 2000 sshdr.sense_key == ILLEGAL_REQUEST && 2001 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 2002 sshdr.ascq == 0x00) 2003 /* Invalid Command Operation Code or 2004 * Invalid Field in CDB, just retry 2005 * silently with RC10 */ 2006 return -EINVAL; 2007 if (sense_valid && 2008 sshdr.sense_key == UNIT_ATTENTION && 2009 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2010 /* Device reset might occur several times, 2011 * give it one more chance */ 2012 if (--reset_retries > 0) 2013 continue; 2014 } 2015 retries--; 2016 2017 } while (the_result && retries); 2018 2019 if (the_result) { 2020 sd_print_result(sdkp, "Read Capacity(16) failed", the_result); 2021 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2022 return -EINVAL; 2023 } 2024 2025 sector_size = get_unaligned_be32(&buffer[8]); 2026 lba = get_unaligned_be64(&buffer[0]); 2027 2028 if (sd_read_protection_type(sdkp, buffer) < 0) { 2029 sdkp->capacity = 0; 2030 return -ENODEV; 2031 } 2032 2033 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 2034 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2035 "kernel compiled with support for large block " 2036 "devices.\n"); 2037 sdkp->capacity = 0; 2038 return -EOVERFLOW; 2039 } 2040 2041 /* Logical blocks per physical block exponent */ 2042 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 2043 2044 /* Lowest aligned logical block */ 2045 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 2046 blk_queue_alignment_offset(sdp->request_queue, alignment); 2047 if (alignment && sdkp->first_scan) 2048 sd_printk(KERN_NOTICE, sdkp, 2049 "physical block alignment offset: %u\n", alignment); 2050 2051 if (buffer[14] & 0x80) { /* LBPME */ 2052 sdkp->lbpme = 1; 2053 2054 if (buffer[14] & 0x40) /* LBPRZ */ 2055 sdkp->lbprz = 1; 2056 2057 sd_config_discard(sdkp, SD_LBP_WS16); 2058 } 2059 2060 sdkp->capacity = lba + 1; 2061 return sector_size; 2062 } 2063 2064 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 2065 unsigned char *buffer) 2066 { 2067 unsigned char cmd[16]; 2068 struct scsi_sense_hdr sshdr; 2069 int sense_valid = 0; 2070 int the_result; 2071 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2072 sector_t lba; 2073 unsigned sector_size; 2074 2075 do { 2076 cmd[0] = READ_CAPACITY; 2077 memset(&cmd[1], 0, 9); 2078 memset(buffer, 0, 8); 2079 2080 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2081 buffer, 8, &sshdr, 2082 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2083 2084 if (media_not_present(sdkp, &sshdr)) 2085 return -ENODEV; 2086 2087 if (the_result) { 2088 sense_valid = scsi_sense_valid(&sshdr); 2089 if (sense_valid && 2090 sshdr.sense_key == UNIT_ATTENTION && 2091 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2092 /* Device reset might occur several times, 2093 * give it one more chance */ 2094 if (--reset_retries > 0) 2095 continue; 2096 } 2097 retries--; 2098 2099 } while (the_result && retries); 2100 2101 if (the_result) { 2102 sd_print_result(sdkp, "Read Capacity(10) failed", the_result); 2103 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2104 return -EINVAL; 2105 } 2106 2107 sector_size = get_unaligned_be32(&buffer[4]); 2108 lba = get_unaligned_be32(&buffer[0]); 2109 2110 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 2111 /* Some buggy (usb cardreader) devices return an lba of 2112 0xffffffff when the want to report a size of 0 (with 2113 which they really mean no media is present) */ 2114 sdkp->capacity = 0; 2115 sdkp->physical_block_size = sector_size; 2116 return sector_size; 2117 } 2118 2119 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 2120 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2121 "kernel compiled with support for large block " 2122 "devices.\n"); 2123 sdkp->capacity = 0; 2124 return -EOVERFLOW; 2125 } 2126 2127 sdkp->capacity = lba + 1; 2128 sdkp->physical_block_size = sector_size; 2129 return sector_size; 2130 } 2131 2132 static int sd_try_rc16_first(struct scsi_device *sdp) 2133 { 2134 if (sdp->host->max_cmd_len < 16) 2135 return 0; 2136 if (sdp->try_rc_10_first) 2137 return 0; 2138 if (sdp->scsi_level > SCSI_SPC_2) 2139 return 1; 2140 if (scsi_device_protection(sdp)) 2141 return 1; 2142 return 0; 2143 } 2144 2145 /* 2146 * read disk capacity 2147 */ 2148 static void 2149 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 2150 { 2151 int sector_size; 2152 struct scsi_device *sdp = sdkp->device; 2153 sector_t old_capacity = sdkp->capacity; 2154 2155 if (sd_try_rc16_first(sdp)) { 2156 sector_size = read_capacity_16(sdkp, sdp, buffer); 2157 if (sector_size == -EOVERFLOW) 2158 goto got_data; 2159 if (sector_size == -ENODEV) 2160 return; 2161 if (sector_size < 0) 2162 sector_size = read_capacity_10(sdkp, sdp, buffer); 2163 if (sector_size < 0) 2164 return; 2165 } else { 2166 sector_size = read_capacity_10(sdkp, sdp, buffer); 2167 if (sector_size == -EOVERFLOW) 2168 goto got_data; 2169 if (sector_size < 0) 2170 return; 2171 if ((sizeof(sdkp->capacity) > 4) && 2172 (sdkp->capacity > 0xffffffffULL)) { 2173 int old_sector_size = sector_size; 2174 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 2175 "Trying to use READ CAPACITY(16).\n"); 2176 sector_size = read_capacity_16(sdkp, sdp, buffer); 2177 if (sector_size < 0) { 2178 sd_printk(KERN_NOTICE, sdkp, 2179 "Using 0xffffffff as device size\n"); 2180 sdkp->capacity = 1 + (sector_t) 0xffffffff; 2181 sector_size = old_sector_size; 2182 goto got_data; 2183 } 2184 } 2185 } 2186 2187 /* Some devices are known to return the total number of blocks, 2188 * not the highest block number. Some devices have versions 2189 * which do this and others which do not. Some devices we might 2190 * suspect of doing this but we don't know for certain. 2191 * 2192 * If we know the reported capacity is wrong, decrement it. If 2193 * we can only guess, then assume the number of blocks is even 2194 * (usually true but not always) and err on the side of lowering 2195 * the capacity. 2196 */ 2197 if (sdp->fix_capacity || 2198 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 2199 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 2200 "from its reported value: %llu\n", 2201 (unsigned long long) sdkp->capacity); 2202 --sdkp->capacity; 2203 } 2204 2205 got_data: 2206 if (sector_size == 0) { 2207 sector_size = 512; 2208 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 2209 "assuming 512.\n"); 2210 } 2211 2212 if (sector_size != 512 && 2213 sector_size != 1024 && 2214 sector_size != 2048 && 2215 sector_size != 4096 && 2216 sector_size != 256) { 2217 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 2218 sector_size); 2219 /* 2220 * The user might want to re-format the drive with 2221 * a supported sectorsize. Once this happens, it 2222 * would be relatively trivial to set the thing up. 2223 * For this reason, we leave the thing in the table. 2224 */ 2225 sdkp->capacity = 0; 2226 /* 2227 * set a bogus sector size so the normal read/write 2228 * logic in the block layer will eventually refuse any 2229 * request on this device without tripping over power 2230 * of two sector size assumptions 2231 */ 2232 sector_size = 512; 2233 } 2234 blk_queue_logical_block_size(sdp->request_queue, sector_size); 2235 2236 { 2237 char cap_str_2[10], cap_str_10[10]; 2238 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 2239 2240 string_get_size(sz, STRING_UNITS_2, cap_str_2, 2241 sizeof(cap_str_2)); 2242 string_get_size(sz, STRING_UNITS_10, cap_str_10, 2243 sizeof(cap_str_10)); 2244 2245 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 2246 sd_printk(KERN_NOTICE, sdkp, 2247 "%llu %d-byte logical blocks: (%s/%s)\n", 2248 (unsigned long long)sdkp->capacity, 2249 sector_size, cap_str_10, cap_str_2); 2250 2251 if (sdkp->physical_block_size != sector_size) 2252 sd_printk(KERN_NOTICE, sdkp, 2253 "%u-byte physical blocks\n", 2254 sdkp->physical_block_size); 2255 } 2256 } 2257 2258 if (sdkp->capacity > 0xffffffff) { 2259 sdp->use_16_for_rw = 1; 2260 sdkp->max_xfer_blocks = SD_MAX_XFER_BLOCKS; 2261 } else 2262 sdkp->max_xfer_blocks = SD_DEF_XFER_BLOCKS; 2263 2264 /* Rescale capacity to 512-byte units */ 2265 if (sector_size == 4096) 2266 sdkp->capacity <<= 3; 2267 else if (sector_size == 2048) 2268 sdkp->capacity <<= 2; 2269 else if (sector_size == 1024) 2270 sdkp->capacity <<= 1; 2271 else if (sector_size == 256) 2272 sdkp->capacity >>= 1; 2273 2274 blk_queue_physical_block_size(sdp->request_queue, 2275 sdkp->physical_block_size); 2276 sdkp->device->sector_size = sector_size; 2277 } 2278 2279 /* called with buffer of length 512 */ 2280 static inline int 2281 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 2282 unsigned char *buffer, int len, struct scsi_mode_data *data, 2283 struct scsi_sense_hdr *sshdr) 2284 { 2285 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 2286 SD_TIMEOUT, SD_MAX_RETRIES, data, 2287 sshdr); 2288 } 2289 2290 /* 2291 * read write protect setting, if possible - called only in sd_revalidate_disk() 2292 * called with buffer of length SD_BUF_SIZE 2293 */ 2294 static void 2295 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 2296 { 2297 int res; 2298 struct scsi_device *sdp = sdkp->device; 2299 struct scsi_mode_data data; 2300 int old_wp = sdkp->write_prot; 2301 2302 set_disk_ro(sdkp->disk, 0); 2303 if (sdp->skip_ms_page_3f) { 2304 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 2305 return; 2306 } 2307 2308 if (sdp->use_192_bytes_for_3f) { 2309 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 2310 } else { 2311 /* 2312 * First attempt: ask for all pages (0x3F), but only 4 bytes. 2313 * We have to start carefully: some devices hang if we ask 2314 * for more than is available. 2315 */ 2316 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 2317 2318 /* 2319 * Second attempt: ask for page 0 When only page 0 is 2320 * implemented, a request for page 3F may return Sense Key 2321 * 5: Illegal Request, Sense Code 24: Invalid field in 2322 * CDB. 2323 */ 2324 if (!scsi_status_is_good(res)) 2325 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 2326 2327 /* 2328 * Third attempt: ask 255 bytes, as we did earlier. 2329 */ 2330 if (!scsi_status_is_good(res)) 2331 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 2332 &data, NULL); 2333 } 2334 2335 if (!scsi_status_is_good(res)) { 2336 sd_first_printk(KERN_WARNING, sdkp, 2337 "Test WP failed, assume Write Enabled\n"); 2338 } else { 2339 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 2340 set_disk_ro(sdkp->disk, sdkp->write_prot); 2341 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 2342 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 2343 sdkp->write_prot ? "on" : "off"); 2344 sd_printk(KERN_DEBUG, sdkp, 2345 "Mode Sense: %02x %02x %02x %02x\n", 2346 buffer[0], buffer[1], buffer[2], buffer[3]); 2347 } 2348 } 2349 } 2350 2351 /* 2352 * sd_read_cache_type - called only from sd_revalidate_disk() 2353 * called with buffer of length SD_BUF_SIZE 2354 */ 2355 static void 2356 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 2357 { 2358 int len = 0, res; 2359 struct scsi_device *sdp = sdkp->device; 2360 2361 int dbd; 2362 int modepage; 2363 int first_len; 2364 struct scsi_mode_data data; 2365 struct scsi_sense_hdr sshdr; 2366 int old_wce = sdkp->WCE; 2367 int old_rcd = sdkp->RCD; 2368 int old_dpofua = sdkp->DPOFUA; 2369 2370 2371 if (sdkp->cache_override) 2372 return; 2373 2374 first_len = 4; 2375 if (sdp->skip_ms_page_8) { 2376 if (sdp->type == TYPE_RBC) 2377 goto defaults; 2378 else { 2379 if (sdp->skip_ms_page_3f) 2380 goto defaults; 2381 modepage = 0x3F; 2382 if (sdp->use_192_bytes_for_3f) 2383 first_len = 192; 2384 dbd = 0; 2385 } 2386 } else if (sdp->type == TYPE_RBC) { 2387 modepage = 6; 2388 dbd = 8; 2389 } else { 2390 modepage = 8; 2391 dbd = 0; 2392 } 2393 2394 /* cautiously ask */ 2395 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, 2396 &data, &sshdr); 2397 2398 if (!scsi_status_is_good(res)) 2399 goto bad_sense; 2400 2401 if (!data.header_length) { 2402 modepage = 6; 2403 first_len = 0; 2404 sd_first_printk(KERN_ERR, sdkp, 2405 "Missing header in MODE_SENSE response\n"); 2406 } 2407 2408 /* that went OK, now ask for the proper length */ 2409 len = data.length; 2410 2411 /* 2412 * We're only interested in the first three bytes, actually. 2413 * But the data cache page is defined for the first 20. 2414 */ 2415 if (len < 3) 2416 goto bad_sense; 2417 else if (len > SD_BUF_SIZE) { 2418 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " 2419 "data from %d to %d bytes\n", len, SD_BUF_SIZE); 2420 len = SD_BUF_SIZE; 2421 } 2422 if (modepage == 0x3F && sdp->use_192_bytes_for_3f) 2423 len = 192; 2424 2425 /* Get the data */ 2426 if (len > first_len) 2427 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, 2428 &data, &sshdr); 2429 2430 if (scsi_status_is_good(res)) { 2431 int offset = data.header_length + data.block_descriptor_length; 2432 2433 while (offset < len) { 2434 u8 page_code = buffer[offset] & 0x3F; 2435 u8 spf = buffer[offset] & 0x40; 2436 2437 if (page_code == 8 || page_code == 6) { 2438 /* We're interested only in the first 3 bytes. 2439 */ 2440 if (len - offset <= 2) { 2441 sd_first_printk(KERN_ERR, sdkp, 2442 "Incomplete mode parameter " 2443 "data\n"); 2444 goto defaults; 2445 } else { 2446 modepage = page_code; 2447 goto Page_found; 2448 } 2449 } else { 2450 /* Go to the next page */ 2451 if (spf && len - offset > 3) 2452 offset += 4 + (buffer[offset+2] << 8) + 2453 buffer[offset+3]; 2454 else if (!spf && len - offset > 1) 2455 offset += 2 + buffer[offset+1]; 2456 else { 2457 sd_first_printk(KERN_ERR, sdkp, 2458 "Incomplete mode " 2459 "parameter data\n"); 2460 goto defaults; 2461 } 2462 } 2463 } 2464 2465 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n"); 2466 goto defaults; 2467 2468 Page_found: 2469 if (modepage == 8) { 2470 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 2471 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 2472 } else { 2473 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 2474 sdkp->RCD = 0; 2475 } 2476 2477 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 2478 if (sdp->broken_fua) { 2479 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n"); 2480 sdkp->DPOFUA = 0; 2481 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 2482 sd_first_printk(KERN_NOTICE, sdkp, 2483 "Uses READ/WRITE(6), disabling FUA\n"); 2484 sdkp->DPOFUA = 0; 2485 } 2486 2487 /* No cache flush allowed for write protected devices */ 2488 if (sdkp->WCE && sdkp->write_prot) 2489 sdkp->WCE = 0; 2490 2491 if (sdkp->first_scan || old_wce != sdkp->WCE || 2492 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 2493 sd_printk(KERN_NOTICE, sdkp, 2494 "Write cache: %s, read cache: %s, %s\n", 2495 sdkp->WCE ? "enabled" : "disabled", 2496 sdkp->RCD ? "disabled" : "enabled", 2497 sdkp->DPOFUA ? "supports DPO and FUA" 2498 : "doesn't support DPO or FUA"); 2499 2500 return; 2501 } 2502 2503 bad_sense: 2504 if (scsi_sense_valid(&sshdr) && 2505 sshdr.sense_key == ILLEGAL_REQUEST && 2506 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 2507 /* Invalid field in CDB */ 2508 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 2509 else 2510 sd_first_printk(KERN_ERR, sdkp, 2511 "Asking for cache data failed\n"); 2512 2513 defaults: 2514 if (sdp->wce_default_on) { 2515 sd_first_printk(KERN_NOTICE, sdkp, 2516 "Assuming drive cache: write back\n"); 2517 sdkp->WCE = 1; 2518 } else { 2519 sd_first_printk(KERN_ERR, sdkp, 2520 "Assuming drive cache: write through\n"); 2521 sdkp->WCE = 0; 2522 } 2523 sdkp->RCD = 0; 2524 sdkp->DPOFUA = 0; 2525 } 2526 2527 /* 2528 * The ATO bit indicates whether the DIF application tag is available 2529 * for use by the operating system. 2530 */ 2531 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 2532 { 2533 int res, offset; 2534 struct scsi_device *sdp = sdkp->device; 2535 struct scsi_mode_data data; 2536 struct scsi_sense_hdr sshdr; 2537 2538 if (sdp->type != TYPE_DISK) 2539 return; 2540 2541 if (sdkp->protection_type == 0) 2542 return; 2543 2544 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 2545 SD_MAX_RETRIES, &data, &sshdr); 2546 2547 if (!scsi_status_is_good(res) || !data.header_length || 2548 data.length < 6) { 2549 sd_first_printk(KERN_WARNING, sdkp, 2550 "getting Control mode page failed, assume no ATO\n"); 2551 2552 if (scsi_sense_valid(&sshdr)) 2553 sd_print_sense_hdr(sdkp, &sshdr); 2554 2555 return; 2556 } 2557 2558 offset = data.header_length + data.block_descriptor_length; 2559 2560 if ((buffer[offset] & 0x3f) != 0x0a) { 2561 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2562 return; 2563 } 2564 2565 if ((buffer[offset + 5] & 0x80) == 0) 2566 return; 2567 2568 sdkp->ATO = 1; 2569 2570 return; 2571 } 2572 2573 /** 2574 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2575 * @disk: disk to query 2576 */ 2577 static void sd_read_block_limits(struct scsi_disk *sdkp) 2578 { 2579 unsigned int sector_sz = sdkp->device->sector_size; 2580 const int vpd_len = 64; 2581 u32 max_xfer_length; 2582 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2583 2584 if (!buffer || 2585 /* Block Limits VPD */ 2586 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2587 goto out; 2588 2589 max_xfer_length = get_unaligned_be32(&buffer[8]); 2590 if (max_xfer_length) 2591 sdkp->max_xfer_blocks = max_xfer_length; 2592 2593 blk_queue_io_min(sdkp->disk->queue, 2594 get_unaligned_be16(&buffer[6]) * sector_sz); 2595 blk_queue_io_opt(sdkp->disk->queue, 2596 get_unaligned_be32(&buffer[12]) * sector_sz); 2597 2598 if (buffer[3] == 0x3c) { 2599 unsigned int lba_count, desc_count; 2600 2601 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); 2602 2603 if (!sdkp->lbpme) 2604 goto out; 2605 2606 lba_count = get_unaligned_be32(&buffer[20]); 2607 desc_count = get_unaligned_be32(&buffer[24]); 2608 2609 if (lba_count && desc_count) 2610 sdkp->max_unmap_blocks = lba_count; 2611 2612 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); 2613 2614 if (buffer[32] & 0x80) 2615 sdkp->unmap_alignment = 2616 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2617 2618 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ 2619 2620 if (sdkp->max_unmap_blocks) 2621 sd_config_discard(sdkp, SD_LBP_UNMAP); 2622 else 2623 sd_config_discard(sdkp, SD_LBP_WS16); 2624 2625 } else { /* LBP VPD page tells us what to use */ 2626 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz) 2627 sd_config_discard(sdkp, SD_LBP_UNMAP); 2628 else if (sdkp->lbpws) 2629 sd_config_discard(sdkp, SD_LBP_WS16); 2630 else if (sdkp->lbpws10) 2631 sd_config_discard(sdkp, SD_LBP_WS10); 2632 else if (sdkp->lbpu && sdkp->max_unmap_blocks) 2633 sd_config_discard(sdkp, SD_LBP_UNMAP); 2634 else 2635 sd_config_discard(sdkp, SD_LBP_DISABLE); 2636 } 2637 } 2638 2639 out: 2640 kfree(buffer); 2641 } 2642 2643 /** 2644 * sd_read_block_characteristics - Query block dev. characteristics 2645 * @disk: disk to query 2646 */ 2647 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2648 { 2649 unsigned char *buffer; 2650 u16 rot; 2651 const int vpd_len = 64; 2652 2653 buffer = kmalloc(vpd_len, GFP_KERNEL); 2654 2655 if (!buffer || 2656 /* Block Device Characteristics VPD */ 2657 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2658 goto out; 2659 2660 rot = get_unaligned_be16(&buffer[4]); 2661 2662 if (rot == 1) { 2663 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2664 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue); 2665 } 2666 2667 out: 2668 kfree(buffer); 2669 } 2670 2671 /** 2672 * sd_read_block_provisioning - Query provisioning VPD page 2673 * @disk: disk to query 2674 */ 2675 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 2676 { 2677 unsigned char *buffer; 2678 const int vpd_len = 8; 2679 2680 if (sdkp->lbpme == 0) 2681 return; 2682 2683 buffer = kmalloc(vpd_len, GFP_KERNEL); 2684 2685 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) 2686 goto out; 2687 2688 sdkp->lbpvpd = 1; 2689 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ 2690 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ 2691 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ 2692 2693 out: 2694 kfree(buffer); 2695 } 2696 2697 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) 2698 { 2699 struct scsi_device *sdev = sdkp->device; 2700 2701 if (sdev->host->no_write_same) { 2702 sdev->no_write_same = 1; 2703 2704 return; 2705 } 2706 2707 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) { 2708 /* too large values might cause issues with arcmsr */ 2709 int vpd_buf_len = 64; 2710 2711 sdev->no_report_opcodes = 1; 2712 2713 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION 2714 * CODES is unsupported and the device has an ATA 2715 * Information VPD page (SAT). 2716 */ 2717 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len)) 2718 sdev->no_write_same = 1; 2719 } 2720 2721 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1) 2722 sdkp->ws16 = 1; 2723 2724 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1) 2725 sdkp->ws10 = 1; 2726 } 2727 2728 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2729 { 2730 /* Attempt VPD inquiry if the device blacklist explicitly calls 2731 * for it. 2732 */ 2733 if (sdp->try_vpd_pages) 2734 return 1; 2735 /* 2736 * Although VPD inquiries can go to SCSI-2 type devices, 2737 * some USB ones crash on receiving them, and the pages 2738 * we currently ask for are for SPC-3 and beyond 2739 */ 2740 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages) 2741 return 1; 2742 return 0; 2743 } 2744 2745 /** 2746 * sd_revalidate_disk - called the first time a new disk is seen, 2747 * performs disk spin up, read_capacity, etc. 2748 * @disk: struct gendisk we care about 2749 **/ 2750 static int sd_revalidate_disk(struct gendisk *disk) 2751 { 2752 struct scsi_disk *sdkp = scsi_disk(disk); 2753 struct scsi_device *sdp = sdkp->device; 2754 unsigned char *buffer; 2755 unsigned int max_xfer; 2756 2757 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2758 "sd_revalidate_disk\n")); 2759 2760 /* 2761 * If the device is offline, don't try and read capacity or any 2762 * of the other niceties. 2763 */ 2764 if (!scsi_device_online(sdp)) 2765 goto out; 2766 2767 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2768 if (!buffer) { 2769 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2770 "allocation failure.\n"); 2771 goto out; 2772 } 2773 2774 sd_spinup_disk(sdkp); 2775 2776 /* 2777 * Without media there is no reason to ask; moreover, some devices 2778 * react badly if we do. 2779 */ 2780 if (sdkp->media_present) { 2781 sd_read_capacity(sdkp, buffer); 2782 2783 if (sd_try_extended_inquiry(sdp)) { 2784 sd_read_block_provisioning(sdkp); 2785 sd_read_block_limits(sdkp); 2786 sd_read_block_characteristics(sdkp); 2787 } 2788 2789 sd_read_write_protect_flag(sdkp, buffer); 2790 sd_read_cache_type(sdkp, buffer); 2791 sd_read_app_tag_own(sdkp, buffer); 2792 sd_read_write_same(sdkp, buffer); 2793 } 2794 2795 sdkp->first_scan = 0; 2796 2797 /* 2798 * We now have all cache related info, determine how we deal 2799 * with flush requests. 2800 */ 2801 sd_set_flush_flag(sdkp); 2802 2803 max_xfer = sdkp->max_xfer_blocks; 2804 max_xfer <<= ilog2(sdp->sector_size) - 9; 2805 2806 max_xfer = min_not_zero(queue_max_hw_sectors(sdkp->disk->queue), 2807 max_xfer); 2808 blk_queue_max_hw_sectors(sdkp->disk->queue, max_xfer); 2809 set_capacity(disk, sdkp->capacity); 2810 sd_config_write_same(sdkp); 2811 kfree(buffer); 2812 2813 out: 2814 return 0; 2815 } 2816 2817 /** 2818 * sd_unlock_native_capacity - unlock native capacity 2819 * @disk: struct gendisk to set capacity for 2820 * 2821 * Block layer calls this function if it detects that partitions 2822 * on @disk reach beyond the end of the device. If the SCSI host 2823 * implements ->unlock_native_capacity() method, it's invoked to 2824 * give it a chance to adjust the device capacity. 2825 * 2826 * CONTEXT: 2827 * Defined by block layer. Might sleep. 2828 */ 2829 static void sd_unlock_native_capacity(struct gendisk *disk) 2830 { 2831 struct scsi_device *sdev = scsi_disk(disk)->device; 2832 2833 if (sdev->host->hostt->unlock_native_capacity) 2834 sdev->host->hostt->unlock_native_capacity(sdev); 2835 } 2836 2837 /** 2838 * sd_format_disk_name - format disk name 2839 * @prefix: name prefix - ie. "sd" for SCSI disks 2840 * @index: index of the disk to format name for 2841 * @buf: output buffer 2842 * @buflen: length of the output buffer 2843 * 2844 * SCSI disk names starts at sda. The 26th device is sdz and the 2845 * 27th is sdaa. The last one for two lettered suffix is sdzz 2846 * which is followed by sdaaa. 2847 * 2848 * This is basically 26 base counting with one extra 'nil' entry 2849 * at the beginning from the second digit on and can be 2850 * determined using similar method as 26 base conversion with the 2851 * index shifted -1 after each digit is computed. 2852 * 2853 * CONTEXT: 2854 * Don't care. 2855 * 2856 * RETURNS: 2857 * 0 on success, -errno on failure. 2858 */ 2859 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2860 { 2861 const int base = 'z' - 'a' + 1; 2862 char *begin = buf + strlen(prefix); 2863 char *end = buf + buflen; 2864 char *p; 2865 int unit; 2866 2867 p = end - 1; 2868 *p = '\0'; 2869 unit = base; 2870 do { 2871 if (p == begin) 2872 return -EINVAL; 2873 *--p = 'a' + (index % unit); 2874 index = (index / unit) - 1; 2875 } while (index >= 0); 2876 2877 memmove(begin, p, end - p); 2878 memcpy(buf, prefix, strlen(prefix)); 2879 2880 return 0; 2881 } 2882 2883 /* 2884 * The asynchronous part of sd_probe 2885 */ 2886 static void sd_probe_async(void *data, async_cookie_t cookie) 2887 { 2888 struct scsi_disk *sdkp = data; 2889 struct scsi_device *sdp; 2890 struct gendisk *gd; 2891 u32 index; 2892 struct device *dev; 2893 2894 sdp = sdkp->device; 2895 gd = sdkp->disk; 2896 index = sdkp->index; 2897 dev = &sdp->sdev_gendev; 2898 2899 gd->major = sd_major((index & 0xf0) >> 4); 2900 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2901 gd->minors = SD_MINORS; 2902 2903 gd->fops = &sd_fops; 2904 gd->private_data = &sdkp->driver; 2905 gd->queue = sdkp->device->request_queue; 2906 2907 /* defaults, until the device tells us otherwise */ 2908 sdp->sector_size = 512; 2909 sdkp->capacity = 0; 2910 sdkp->media_present = 1; 2911 sdkp->write_prot = 0; 2912 sdkp->cache_override = 0; 2913 sdkp->WCE = 0; 2914 sdkp->RCD = 0; 2915 sdkp->ATO = 0; 2916 sdkp->first_scan = 1; 2917 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; 2918 2919 sd_revalidate_disk(gd); 2920 2921 gd->driverfs_dev = &sdp->sdev_gendev; 2922 gd->flags = GENHD_FL_EXT_DEVT; 2923 if (sdp->removable) { 2924 gd->flags |= GENHD_FL_REMOVABLE; 2925 gd->events |= DISK_EVENT_MEDIA_CHANGE; 2926 } 2927 2928 blk_pm_runtime_init(sdp->request_queue, dev); 2929 add_disk(gd); 2930 if (sdkp->capacity) 2931 sd_dif_config_host(sdkp); 2932 2933 sd_revalidate_disk(gd); 2934 2935 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2936 sdp->removable ? "removable " : ""); 2937 scsi_autopm_put_device(sdp); 2938 put_device(&sdkp->dev); 2939 } 2940 2941 /** 2942 * sd_probe - called during driver initialization and whenever a 2943 * new scsi device is attached to the system. It is called once 2944 * for each scsi device (not just disks) present. 2945 * @dev: pointer to device object 2946 * 2947 * Returns 0 if successful (or not interested in this scsi device 2948 * (e.g. scanner)); 1 when there is an error. 2949 * 2950 * Note: this function is invoked from the scsi mid-level. 2951 * This function sets up the mapping between a given 2952 * <host,channel,id,lun> (found in sdp) and new device name 2953 * (e.g. /dev/sda). More precisely it is the block device major 2954 * and minor number that is chosen here. 2955 * 2956 * Assume sd_probe is not re-entrant (for time being) 2957 * Also think about sd_probe() and sd_remove() running coincidentally. 2958 **/ 2959 static int sd_probe(struct device *dev) 2960 { 2961 struct scsi_device *sdp = to_scsi_device(dev); 2962 struct scsi_disk *sdkp; 2963 struct gendisk *gd; 2964 int index; 2965 int error; 2966 2967 scsi_autopm_get_device(sdp); 2968 error = -ENODEV; 2969 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2970 goto out; 2971 2972 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2973 "sd_probe\n")); 2974 2975 error = -ENOMEM; 2976 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2977 if (!sdkp) 2978 goto out; 2979 2980 gd = alloc_disk(SD_MINORS); 2981 if (!gd) 2982 goto out_free; 2983 2984 do { 2985 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2986 goto out_put; 2987 2988 spin_lock(&sd_index_lock); 2989 error = ida_get_new(&sd_index_ida, &index); 2990 spin_unlock(&sd_index_lock); 2991 } while (error == -EAGAIN); 2992 2993 if (error) { 2994 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); 2995 goto out_put; 2996 } 2997 2998 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2999 if (error) { 3000 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); 3001 goto out_free_index; 3002 } 3003 3004 sdkp->device = sdp; 3005 sdkp->driver = &sd_template; 3006 sdkp->disk = gd; 3007 sdkp->index = index; 3008 atomic_set(&sdkp->openers, 0); 3009 atomic_set(&sdkp->device->ioerr_cnt, 0); 3010 3011 if (!sdp->request_queue->rq_timeout) { 3012 if (sdp->type != TYPE_MOD) 3013 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 3014 else 3015 blk_queue_rq_timeout(sdp->request_queue, 3016 SD_MOD_TIMEOUT); 3017 } 3018 3019 device_initialize(&sdkp->dev); 3020 sdkp->dev.parent = dev; 3021 sdkp->dev.class = &sd_disk_class; 3022 dev_set_name(&sdkp->dev, "%s", dev_name(dev)); 3023 3024 if (device_add(&sdkp->dev)) 3025 goto out_free_index; 3026 3027 get_device(dev); 3028 dev_set_drvdata(dev, sdkp); 3029 3030 get_device(&sdkp->dev); /* prevent release before async_schedule */ 3031 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain); 3032 3033 return 0; 3034 3035 out_free_index: 3036 spin_lock(&sd_index_lock); 3037 ida_remove(&sd_index_ida, index); 3038 spin_unlock(&sd_index_lock); 3039 out_put: 3040 put_disk(gd); 3041 out_free: 3042 kfree(sdkp); 3043 out: 3044 scsi_autopm_put_device(sdp); 3045 return error; 3046 } 3047 3048 /** 3049 * sd_remove - called whenever a scsi disk (previously recognized by 3050 * sd_probe) is detached from the system. It is called (potentially 3051 * multiple times) during sd module unload. 3052 * @sdp: pointer to mid level scsi device object 3053 * 3054 * Note: this function is invoked from the scsi mid-level. 3055 * This function potentially frees up a device name (e.g. /dev/sdc) 3056 * that could be re-used by a subsequent sd_probe(). 3057 * This function is not called when the built-in sd driver is "exit-ed". 3058 **/ 3059 static int sd_remove(struct device *dev) 3060 { 3061 struct scsi_disk *sdkp; 3062 dev_t devt; 3063 3064 sdkp = dev_get_drvdata(dev); 3065 devt = disk_devt(sdkp->disk); 3066 scsi_autopm_get_device(sdkp->device); 3067 3068 async_synchronize_full_domain(&scsi_sd_pm_domain); 3069 async_synchronize_full_domain(&scsi_sd_probe_domain); 3070 device_del(&sdkp->dev); 3071 del_gendisk(sdkp->disk); 3072 sd_shutdown(dev); 3073 3074 blk_register_region(devt, SD_MINORS, NULL, 3075 sd_default_probe, NULL, NULL); 3076 3077 mutex_lock(&sd_ref_mutex); 3078 dev_set_drvdata(dev, NULL); 3079 put_device(&sdkp->dev); 3080 mutex_unlock(&sd_ref_mutex); 3081 3082 return 0; 3083 } 3084 3085 /** 3086 * scsi_disk_release - Called to free the scsi_disk structure 3087 * @dev: pointer to embedded class device 3088 * 3089 * sd_ref_mutex must be held entering this routine. Because it is 3090 * called on last put, you should always use the scsi_disk_get() 3091 * scsi_disk_put() helpers which manipulate the semaphore directly 3092 * and never do a direct put_device. 3093 **/ 3094 static void scsi_disk_release(struct device *dev) 3095 { 3096 struct scsi_disk *sdkp = to_scsi_disk(dev); 3097 struct gendisk *disk = sdkp->disk; 3098 3099 spin_lock(&sd_index_lock); 3100 ida_remove(&sd_index_ida, sdkp->index); 3101 spin_unlock(&sd_index_lock); 3102 3103 disk->private_data = NULL; 3104 put_disk(disk); 3105 put_device(&sdkp->device->sdev_gendev); 3106 3107 kfree(sdkp); 3108 } 3109 3110 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 3111 { 3112 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 3113 struct scsi_sense_hdr sshdr; 3114 struct scsi_device *sdp = sdkp->device; 3115 int res; 3116 3117 if (start) 3118 cmd[4] |= 1; /* START */ 3119 3120 if (sdp->start_stop_pwr_cond) 3121 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 3122 3123 if (!scsi_device_online(sdp)) 3124 return -ENODEV; 3125 3126 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 3127 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM); 3128 if (res) { 3129 sd_print_result(sdkp, "Start/Stop Unit failed", res); 3130 if (driver_byte(res) & DRIVER_SENSE) 3131 sd_print_sense_hdr(sdkp, &sshdr); 3132 if (scsi_sense_valid(&sshdr) && 3133 /* 0x3a is medium not present */ 3134 sshdr.asc == 0x3a) 3135 res = 0; 3136 } 3137 3138 /* SCSI error codes must not go to the generic layer */ 3139 if (res) 3140 return -EIO; 3141 3142 return 0; 3143 } 3144 3145 /* 3146 * Send a SYNCHRONIZE CACHE instruction down to the device through 3147 * the normal SCSI command structure. Wait for the command to 3148 * complete. 3149 */ 3150 static void sd_shutdown(struct device *dev) 3151 { 3152 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 3153 3154 if (!sdkp) 3155 return; /* this can happen */ 3156 3157 if (pm_runtime_suspended(dev)) 3158 goto exit; 3159 3160 if (sdkp->WCE && sdkp->media_present) { 3161 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3162 sd_sync_cache(sdkp); 3163 } 3164 3165 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 3166 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3167 sd_start_stop_device(sdkp, 0); 3168 } 3169 3170 exit: 3171 scsi_disk_put(sdkp); 3172 } 3173 3174 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors) 3175 { 3176 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 3177 int ret = 0; 3178 3179 if (!sdkp) 3180 return 0; /* this can happen */ 3181 3182 if (sdkp->WCE && sdkp->media_present) { 3183 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3184 ret = sd_sync_cache(sdkp); 3185 if (ret) { 3186 /* ignore OFFLINE device */ 3187 if (ret == -ENODEV) 3188 ret = 0; 3189 goto done; 3190 } 3191 } 3192 3193 if (sdkp->device->manage_start_stop) { 3194 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3195 /* an error is not worth aborting a system sleep */ 3196 ret = sd_start_stop_device(sdkp, 0); 3197 if (ignore_stop_errors) 3198 ret = 0; 3199 } 3200 3201 done: 3202 scsi_disk_put(sdkp); 3203 return ret; 3204 } 3205 3206 static int sd_suspend_system(struct device *dev) 3207 { 3208 return sd_suspend_common(dev, true); 3209 } 3210 3211 static int sd_suspend_runtime(struct device *dev) 3212 { 3213 return sd_suspend_common(dev, false); 3214 } 3215 3216 static int sd_resume(struct device *dev) 3217 { 3218 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 3219 int ret = 0; 3220 3221 if (!sdkp->device->manage_start_stop) 3222 goto done; 3223 3224 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 3225 ret = sd_start_stop_device(sdkp, 1); 3226 3227 done: 3228 scsi_disk_put(sdkp); 3229 return ret; 3230 } 3231 3232 /** 3233 * init_sd - entry point for this driver (both when built in or when 3234 * a module). 3235 * 3236 * Note: this function registers this driver with the scsi mid-level. 3237 **/ 3238 static int __init init_sd(void) 3239 { 3240 int majors = 0, i, err; 3241 3242 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 3243 3244 for (i = 0; i < SD_MAJORS; i++) { 3245 if (register_blkdev(sd_major(i), "sd") != 0) 3246 continue; 3247 majors++; 3248 blk_register_region(sd_major(i), SD_MINORS, NULL, 3249 sd_default_probe, NULL, NULL); 3250 } 3251 3252 if (!majors) 3253 return -ENODEV; 3254 3255 err = class_register(&sd_disk_class); 3256 if (err) 3257 goto err_out; 3258 3259 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 3260 0, 0, NULL); 3261 if (!sd_cdb_cache) { 3262 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 3263 err = -ENOMEM; 3264 goto err_out_class; 3265 } 3266 3267 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 3268 if (!sd_cdb_pool) { 3269 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 3270 err = -ENOMEM; 3271 goto err_out_cache; 3272 } 3273 3274 err = scsi_register_driver(&sd_template.gendrv); 3275 if (err) 3276 goto err_out_driver; 3277 3278 return 0; 3279 3280 err_out_driver: 3281 mempool_destroy(sd_cdb_pool); 3282 3283 err_out_cache: 3284 kmem_cache_destroy(sd_cdb_cache); 3285 3286 err_out_class: 3287 class_unregister(&sd_disk_class); 3288 err_out: 3289 for (i = 0; i < SD_MAJORS; i++) 3290 unregister_blkdev(sd_major(i), "sd"); 3291 return err; 3292 } 3293 3294 /** 3295 * exit_sd - exit point for this driver (when it is a module). 3296 * 3297 * Note: this function unregisters this driver from the scsi mid-level. 3298 **/ 3299 static void __exit exit_sd(void) 3300 { 3301 int i; 3302 3303 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 3304 3305 scsi_unregister_driver(&sd_template.gendrv); 3306 mempool_destroy(sd_cdb_pool); 3307 kmem_cache_destroy(sd_cdb_cache); 3308 3309 class_unregister(&sd_disk_class); 3310 3311 for (i = 0; i < SD_MAJORS; i++) { 3312 blk_unregister_region(sd_major(i), SD_MINORS); 3313 unregister_blkdev(sd_major(i), "sd"); 3314 } 3315 } 3316 3317 module_init(init_sd); 3318 module_exit(exit_sd); 3319 3320 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 3321 struct scsi_sense_hdr *sshdr) 3322 { 3323 scsi_print_sense_hdr(sdkp->device, 3324 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr); 3325 } 3326 3327 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg, 3328 int result) 3329 { 3330 const char *hb_string = scsi_hostbyte_string(result); 3331 const char *db_string = scsi_driverbyte_string(result); 3332 3333 if (hb_string || db_string) 3334 sd_printk(KERN_INFO, sdkp, 3335 "%s: Result: hostbyte=%s driverbyte=%s\n", msg, 3336 hb_string ? hb_string : "invalid", 3337 db_string ? db_string : "invalid"); 3338 else 3339 sd_printk(KERN_INFO, sdkp, 3340 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n", 3341 msg, host_byte(result), driver_byte(result)); 3342 } 3343 3344