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 <linux/pr.h> 55 #include <asm/uaccess.h> 56 #include <asm/unaligned.h> 57 58 #include <scsi/scsi.h> 59 #include <scsi/scsi_cmnd.h> 60 #include <scsi/scsi_dbg.h> 61 #include <scsi/scsi_device.h> 62 #include <scsi/scsi_driver.h> 63 #include <scsi/scsi_eh.h> 64 #include <scsi/scsi_host.h> 65 #include <scsi/scsi_ioctl.h> 66 #include <scsi/scsicam.h> 67 68 #include "sd.h" 69 #include "scsi_priv.h" 70 #include "scsi_logging.h" 71 72 MODULE_AUTHOR("Eric Youngdale"); 73 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 74 MODULE_LICENSE("GPL"); 75 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 92 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 93 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 94 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 95 96 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 97 #define SD_MINORS 16 98 #else 99 #define SD_MINORS 0 100 #endif 101 102 static void sd_config_discard(struct scsi_disk *, unsigned int); 103 static void sd_config_write_same(struct scsi_disk *); 104 static int sd_revalidate_disk(struct gendisk *); 105 static void sd_unlock_native_capacity(struct gendisk *disk); 106 static int sd_probe(struct device *); 107 static int sd_remove(struct device *); 108 static void sd_shutdown(struct device *); 109 static int sd_suspend_system(struct device *); 110 static int sd_suspend_runtime(struct device *); 111 static int sd_resume(struct device *); 112 static void sd_rescan(struct device *); 113 static int sd_init_command(struct scsi_cmnd *SCpnt); 114 static void sd_uninit_command(struct scsi_cmnd *SCpnt); 115 static int sd_done(struct scsi_cmnd *); 116 static int sd_eh_action(struct scsi_cmnd *, int); 117 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 118 static void scsi_disk_release(struct device *cdev); 119 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 120 static void sd_print_result(const struct scsi_disk *, const char *, int); 121 122 static DEFINE_SPINLOCK(sd_index_lock); 123 static DEFINE_IDA(sd_index_ida); 124 125 /* This semaphore is used to mediate the 0->1 reference get in the 126 * face of object destruction (i.e. we can't allow a get on an 127 * object after last put) */ 128 static DEFINE_MUTEX(sd_ref_mutex); 129 130 static struct kmem_cache *sd_cdb_cache; 131 static mempool_t *sd_cdb_pool; 132 133 static const char *sd_cache_types[] = { 134 "write through", "none", "write back", 135 "write back, no read (daft)" 136 }; 137 138 static void sd_set_flush_flag(struct scsi_disk *sdkp) 139 { 140 unsigned flush = 0; 141 142 if (sdkp->WCE) { 143 flush |= REQ_FLUSH; 144 if (sdkp->DPOFUA) 145 flush |= REQ_FUA; 146 } 147 148 blk_queue_flush(sdkp->disk->queue, flush); 149 } 150 151 static ssize_t 152 cache_type_store(struct device *dev, struct device_attribute *attr, 153 const char *buf, size_t count) 154 { 155 int i, ct = -1, rcd, wce, sp; 156 struct scsi_disk *sdkp = to_scsi_disk(dev); 157 struct scsi_device *sdp = sdkp->device; 158 char buffer[64]; 159 char *buffer_data; 160 struct scsi_mode_data data; 161 struct scsi_sense_hdr sshdr; 162 static const char temp[] = "temporary "; 163 int len; 164 165 if (sdp->type != TYPE_DISK) 166 /* no cache control on RBC devices; theoretically they 167 * can do it, but there's probably so many exceptions 168 * it's not worth the risk */ 169 return -EINVAL; 170 171 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { 172 buf += sizeof(temp) - 1; 173 sdkp->cache_override = 1; 174 } else { 175 sdkp->cache_override = 0; 176 } 177 178 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 179 len = strlen(sd_cache_types[i]); 180 if (strncmp(sd_cache_types[i], buf, len) == 0 && 181 buf[len] == '\n') { 182 ct = i; 183 break; 184 } 185 } 186 if (ct < 0) 187 return -EINVAL; 188 rcd = ct & 0x01 ? 1 : 0; 189 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0; 190 191 if (sdkp->cache_override) { 192 sdkp->WCE = wce; 193 sdkp->RCD = rcd; 194 sd_set_flush_flag(sdkp); 195 return count; 196 } 197 198 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 199 SD_MAX_RETRIES, &data, NULL)) 200 return -EINVAL; 201 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 202 data.block_descriptor_length); 203 buffer_data = buffer + data.header_length + 204 data.block_descriptor_length; 205 buffer_data[2] &= ~0x05; 206 buffer_data[2] |= wce << 2 | rcd; 207 sp = buffer_data[0] & 0x80 ? 1 : 0; 208 209 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 210 SD_MAX_RETRIES, &data, &sshdr)) { 211 if (scsi_sense_valid(&sshdr)) 212 sd_print_sense_hdr(sdkp, &sshdr); 213 return -EINVAL; 214 } 215 revalidate_disk(sdkp->disk); 216 return count; 217 } 218 219 static ssize_t 220 manage_start_stop_show(struct device *dev, struct device_attribute *attr, 221 char *buf) 222 { 223 struct scsi_disk *sdkp = to_scsi_disk(dev); 224 struct scsi_device *sdp = sdkp->device; 225 226 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 227 } 228 229 static ssize_t 230 manage_start_stop_store(struct device *dev, struct device_attribute *attr, 231 const char *buf, size_t count) 232 { 233 struct scsi_disk *sdkp = to_scsi_disk(dev); 234 struct scsi_device *sdp = sdkp->device; 235 236 if (!capable(CAP_SYS_ADMIN)) 237 return -EACCES; 238 239 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 240 241 return count; 242 } 243 static DEVICE_ATTR_RW(manage_start_stop); 244 245 static ssize_t 246 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf) 247 { 248 struct scsi_disk *sdkp = to_scsi_disk(dev); 249 250 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 251 } 252 253 static ssize_t 254 allow_restart_store(struct device *dev, struct device_attribute *attr, 255 const char *buf, size_t count) 256 { 257 struct scsi_disk *sdkp = to_scsi_disk(dev); 258 struct scsi_device *sdp = sdkp->device; 259 260 if (!capable(CAP_SYS_ADMIN)) 261 return -EACCES; 262 263 if (sdp->type != TYPE_DISK) 264 return -EINVAL; 265 266 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 267 268 return count; 269 } 270 static DEVICE_ATTR_RW(allow_restart); 271 272 static ssize_t 273 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) 274 { 275 struct scsi_disk *sdkp = to_scsi_disk(dev); 276 int ct = sdkp->RCD + 2*sdkp->WCE; 277 278 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 279 } 280 static DEVICE_ATTR_RW(cache_type); 281 282 static ssize_t 283 FUA_show(struct device *dev, struct device_attribute *attr, char *buf) 284 { 285 struct scsi_disk *sdkp = to_scsi_disk(dev); 286 287 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 288 } 289 static DEVICE_ATTR_RO(FUA); 290 291 static ssize_t 292 protection_type_show(struct device *dev, struct device_attribute *attr, 293 char *buf) 294 { 295 struct scsi_disk *sdkp = to_scsi_disk(dev); 296 297 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 298 } 299 300 static ssize_t 301 protection_type_store(struct device *dev, struct device_attribute *attr, 302 const char *buf, size_t count) 303 { 304 struct scsi_disk *sdkp = to_scsi_disk(dev); 305 unsigned int val; 306 int err; 307 308 if (!capable(CAP_SYS_ADMIN)) 309 return -EACCES; 310 311 err = kstrtouint(buf, 10, &val); 312 313 if (err) 314 return err; 315 316 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION) 317 sdkp->protection_type = val; 318 319 return count; 320 } 321 static DEVICE_ATTR_RW(protection_type); 322 323 static ssize_t 324 protection_mode_show(struct device *dev, struct device_attribute *attr, 325 char *buf) 326 { 327 struct scsi_disk *sdkp = to_scsi_disk(dev); 328 struct scsi_device *sdp = sdkp->device; 329 unsigned int dif, dix; 330 331 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 332 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); 333 334 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) { 335 dif = 0; 336 dix = 1; 337 } 338 339 if (!dif && !dix) 340 return snprintf(buf, 20, "none\n"); 341 342 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif); 343 } 344 static DEVICE_ATTR_RO(protection_mode); 345 346 static ssize_t 347 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf) 348 { 349 struct scsi_disk *sdkp = to_scsi_disk(dev); 350 351 return snprintf(buf, 20, "%u\n", sdkp->ATO); 352 } 353 static DEVICE_ATTR_RO(app_tag_own); 354 355 static ssize_t 356 thin_provisioning_show(struct device *dev, struct device_attribute *attr, 357 char *buf) 358 { 359 struct scsi_disk *sdkp = to_scsi_disk(dev); 360 361 return snprintf(buf, 20, "%u\n", sdkp->lbpme); 362 } 363 static DEVICE_ATTR_RO(thin_provisioning); 364 365 static const char *lbp_mode[] = { 366 [SD_LBP_FULL] = "full", 367 [SD_LBP_UNMAP] = "unmap", 368 [SD_LBP_WS16] = "writesame_16", 369 [SD_LBP_WS10] = "writesame_10", 370 [SD_LBP_ZERO] = "writesame_zero", 371 [SD_LBP_DISABLE] = "disabled", 372 }; 373 374 static ssize_t 375 provisioning_mode_show(struct device *dev, struct device_attribute *attr, 376 char *buf) 377 { 378 struct scsi_disk *sdkp = to_scsi_disk(dev); 379 380 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]); 381 } 382 383 static ssize_t 384 provisioning_mode_store(struct device *dev, struct device_attribute *attr, 385 const char *buf, size_t count) 386 { 387 struct scsi_disk *sdkp = to_scsi_disk(dev); 388 struct scsi_device *sdp = sdkp->device; 389 390 if (!capable(CAP_SYS_ADMIN)) 391 return -EACCES; 392 393 if (sdp->type != TYPE_DISK) 394 return -EINVAL; 395 396 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20)) 397 sd_config_discard(sdkp, SD_LBP_UNMAP); 398 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20)) 399 sd_config_discard(sdkp, SD_LBP_WS16); 400 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20)) 401 sd_config_discard(sdkp, SD_LBP_WS10); 402 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20)) 403 sd_config_discard(sdkp, SD_LBP_ZERO); 404 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20)) 405 sd_config_discard(sdkp, SD_LBP_DISABLE); 406 else 407 return -EINVAL; 408 409 return count; 410 } 411 static DEVICE_ATTR_RW(provisioning_mode); 412 413 static ssize_t 414 max_medium_access_timeouts_show(struct device *dev, 415 struct device_attribute *attr, char *buf) 416 { 417 struct scsi_disk *sdkp = to_scsi_disk(dev); 418 419 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts); 420 } 421 422 static ssize_t 423 max_medium_access_timeouts_store(struct device *dev, 424 struct device_attribute *attr, const char *buf, 425 size_t count) 426 { 427 struct scsi_disk *sdkp = to_scsi_disk(dev); 428 int err; 429 430 if (!capable(CAP_SYS_ADMIN)) 431 return -EACCES; 432 433 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); 434 435 return err ? err : count; 436 } 437 static DEVICE_ATTR_RW(max_medium_access_timeouts); 438 439 static ssize_t 440 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr, 441 char *buf) 442 { 443 struct scsi_disk *sdkp = to_scsi_disk(dev); 444 445 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks); 446 } 447 448 static ssize_t 449 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr, 450 const char *buf, size_t count) 451 { 452 struct scsi_disk *sdkp = to_scsi_disk(dev); 453 struct scsi_device *sdp = sdkp->device; 454 unsigned long max; 455 int err; 456 457 if (!capable(CAP_SYS_ADMIN)) 458 return -EACCES; 459 460 if (sdp->type != TYPE_DISK) 461 return -EINVAL; 462 463 err = kstrtoul(buf, 10, &max); 464 465 if (err) 466 return err; 467 468 if (max == 0) 469 sdp->no_write_same = 1; 470 else if (max <= SD_MAX_WS16_BLOCKS) { 471 sdp->no_write_same = 0; 472 sdkp->max_ws_blocks = max; 473 } 474 475 sd_config_write_same(sdkp); 476 477 return count; 478 } 479 static DEVICE_ATTR_RW(max_write_same_blocks); 480 481 static struct attribute *sd_disk_attrs[] = { 482 &dev_attr_cache_type.attr, 483 &dev_attr_FUA.attr, 484 &dev_attr_allow_restart.attr, 485 &dev_attr_manage_start_stop.attr, 486 &dev_attr_protection_type.attr, 487 &dev_attr_protection_mode.attr, 488 &dev_attr_app_tag_own.attr, 489 &dev_attr_thin_provisioning.attr, 490 &dev_attr_provisioning_mode.attr, 491 &dev_attr_max_write_same_blocks.attr, 492 &dev_attr_max_medium_access_timeouts.attr, 493 NULL, 494 }; 495 ATTRIBUTE_GROUPS(sd_disk); 496 497 static struct class sd_disk_class = { 498 .name = "scsi_disk", 499 .owner = THIS_MODULE, 500 .dev_release = scsi_disk_release, 501 .dev_groups = sd_disk_groups, 502 }; 503 504 static const struct dev_pm_ops sd_pm_ops = { 505 .suspend = sd_suspend_system, 506 .resume = sd_resume, 507 .poweroff = sd_suspend_system, 508 .restore = sd_resume, 509 .runtime_suspend = sd_suspend_runtime, 510 .runtime_resume = sd_resume, 511 }; 512 513 static struct scsi_driver sd_template = { 514 .gendrv = { 515 .name = "sd", 516 .owner = THIS_MODULE, 517 .probe = sd_probe, 518 .remove = sd_remove, 519 .shutdown = sd_shutdown, 520 .pm = &sd_pm_ops, 521 }, 522 .rescan = sd_rescan, 523 .init_command = sd_init_command, 524 .uninit_command = sd_uninit_command, 525 .done = sd_done, 526 .eh_action = sd_eh_action, 527 }; 528 529 /* 530 * Dummy kobj_map->probe function. 531 * The default ->probe function will call modprobe, which is 532 * pointless as this module is already loaded. 533 */ 534 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data) 535 { 536 return NULL; 537 } 538 539 /* 540 * Device no to disk mapping: 541 * 542 * major disc2 disc p1 543 * |............|.............|....|....| <- dev_t 544 * 31 20 19 8 7 4 3 0 545 * 546 * Inside a major, we have 16k disks, however mapped non- 547 * contiguously. The first 16 disks are for major0, the next 548 * ones with major1, ... Disk 256 is for major0 again, disk 272 549 * for major1, ... 550 * As we stay compatible with our numbering scheme, we can reuse 551 * the well-know SCSI majors 8, 65--71, 136--143. 552 */ 553 static int sd_major(int major_idx) 554 { 555 switch (major_idx) { 556 case 0: 557 return SCSI_DISK0_MAJOR; 558 case 1 ... 7: 559 return SCSI_DISK1_MAJOR + major_idx - 1; 560 case 8 ... 15: 561 return SCSI_DISK8_MAJOR + major_idx - 8; 562 default: 563 BUG(); 564 return 0; /* shut up gcc */ 565 } 566 } 567 568 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 569 { 570 struct scsi_disk *sdkp = NULL; 571 572 mutex_lock(&sd_ref_mutex); 573 574 if (disk->private_data) { 575 sdkp = scsi_disk(disk); 576 if (scsi_device_get(sdkp->device) == 0) 577 get_device(&sdkp->dev); 578 else 579 sdkp = NULL; 580 } 581 mutex_unlock(&sd_ref_mutex); 582 return sdkp; 583 } 584 585 static void scsi_disk_put(struct scsi_disk *sdkp) 586 { 587 struct scsi_device *sdev = sdkp->device; 588 589 mutex_lock(&sd_ref_mutex); 590 put_device(&sdkp->dev); 591 scsi_device_put(sdev); 592 mutex_unlock(&sd_ref_mutex); 593 } 594 595 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd, 596 unsigned int dix, unsigned int dif) 597 { 598 struct bio *bio = scmd->request->bio; 599 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif); 600 unsigned int protect = 0; 601 602 if (dix) { /* DIX Type 0, 1, 2, 3 */ 603 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM)) 604 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM; 605 606 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 607 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK; 608 } 609 610 if (dif != SD_DIF_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */ 611 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT; 612 613 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 614 scmd->prot_flags |= SCSI_PROT_REF_CHECK; 615 } 616 617 if (dif) { /* DIX/DIF Type 1, 2, 3 */ 618 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI; 619 620 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK)) 621 protect = 3 << 5; /* Disable target PI checking */ 622 else 623 protect = 1 << 5; /* Enable target PI checking */ 624 } 625 626 scsi_set_prot_op(scmd, prot_op); 627 scsi_set_prot_type(scmd, dif); 628 scmd->prot_flags &= sd_prot_flag_mask(prot_op); 629 630 return protect; 631 } 632 633 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) 634 { 635 struct request_queue *q = sdkp->disk->queue; 636 unsigned int logical_block_size = sdkp->device->sector_size; 637 unsigned int max_blocks = 0; 638 639 q->limits.discard_zeroes_data = 0; 640 q->limits.discard_alignment = sdkp->unmap_alignment * 641 logical_block_size; 642 q->limits.discard_granularity = 643 max(sdkp->physical_block_size, 644 sdkp->unmap_granularity * logical_block_size); 645 646 sdkp->provisioning_mode = mode; 647 648 switch (mode) { 649 650 case SD_LBP_DISABLE: 651 blk_queue_max_discard_sectors(q, 0); 652 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); 653 return; 654 655 case SD_LBP_UNMAP: 656 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 657 (u32)SD_MAX_WS16_BLOCKS); 658 break; 659 660 case SD_LBP_WS16: 661 max_blocks = min_not_zero(sdkp->max_ws_blocks, 662 (u32)SD_MAX_WS16_BLOCKS); 663 q->limits.discard_zeroes_data = sdkp->lbprz; 664 break; 665 666 case SD_LBP_WS10: 667 max_blocks = min_not_zero(sdkp->max_ws_blocks, 668 (u32)SD_MAX_WS10_BLOCKS); 669 q->limits.discard_zeroes_data = sdkp->lbprz; 670 break; 671 672 case SD_LBP_ZERO: 673 max_blocks = min_not_zero(sdkp->max_ws_blocks, 674 (u32)SD_MAX_WS10_BLOCKS); 675 q->limits.discard_zeroes_data = 1; 676 break; 677 } 678 679 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9)); 680 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 681 } 682 683 /** 684 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device 685 * @sdp: scsi device to operate one 686 * @rq: Request to prepare 687 * 688 * Will issue either UNMAP or WRITE SAME(16) depending on preference 689 * indicated by target device. 690 **/ 691 static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd) 692 { 693 struct request *rq = cmd->request; 694 struct scsi_device *sdp = cmd->device; 695 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 696 sector_t sector = blk_rq_pos(rq); 697 unsigned int nr_sectors = blk_rq_sectors(rq); 698 unsigned int nr_bytes = blk_rq_bytes(rq); 699 unsigned int len; 700 int ret; 701 char *buf; 702 struct page *page; 703 704 sector >>= ilog2(sdp->sector_size) - 9; 705 nr_sectors >>= ilog2(sdp->sector_size) - 9; 706 707 page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 708 if (!page) 709 return BLKPREP_DEFER; 710 711 switch (sdkp->provisioning_mode) { 712 case SD_LBP_UNMAP: 713 buf = page_address(page); 714 715 cmd->cmd_len = 10; 716 cmd->cmnd[0] = UNMAP; 717 cmd->cmnd[8] = 24; 718 719 put_unaligned_be16(6 + 16, &buf[0]); 720 put_unaligned_be16(16, &buf[2]); 721 put_unaligned_be64(sector, &buf[8]); 722 put_unaligned_be32(nr_sectors, &buf[16]); 723 724 len = 24; 725 break; 726 727 case SD_LBP_WS16: 728 cmd->cmd_len = 16; 729 cmd->cmnd[0] = WRITE_SAME_16; 730 cmd->cmnd[1] = 0x8; /* UNMAP */ 731 put_unaligned_be64(sector, &cmd->cmnd[2]); 732 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); 733 734 len = sdkp->device->sector_size; 735 break; 736 737 case SD_LBP_WS10: 738 case SD_LBP_ZERO: 739 cmd->cmd_len = 10; 740 cmd->cmnd[0] = WRITE_SAME; 741 if (sdkp->provisioning_mode == SD_LBP_WS10) 742 cmd->cmnd[1] = 0x8; /* UNMAP */ 743 put_unaligned_be32(sector, &cmd->cmnd[2]); 744 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); 745 746 len = sdkp->device->sector_size; 747 break; 748 749 default: 750 ret = BLKPREP_KILL; 751 goto out; 752 } 753 754 rq->completion_data = page; 755 rq->timeout = SD_TIMEOUT; 756 757 cmd->transfersize = len; 758 cmd->allowed = SD_MAX_RETRIES; 759 760 /* 761 * Initially __data_len is set to the amount of data that needs to be 762 * transferred to the target. This amount depends on whether WRITE SAME 763 * or UNMAP is being used. After the scatterlist has been mapped by 764 * scsi_init_io() we set __data_len to the size of the area to be 765 * discarded on disk. This allows us to report completion on the full 766 * amount of blocks described by the request. 767 */ 768 blk_add_request_payload(rq, page, len); 769 ret = scsi_init_io(cmd); 770 rq->__data_len = nr_bytes; 771 772 out: 773 if (ret != BLKPREP_OK) 774 __free_page(page); 775 return ret; 776 } 777 778 static void sd_config_write_same(struct scsi_disk *sdkp) 779 { 780 struct request_queue *q = sdkp->disk->queue; 781 unsigned int logical_block_size = sdkp->device->sector_size; 782 783 if (sdkp->device->no_write_same) { 784 sdkp->max_ws_blocks = 0; 785 goto out; 786 } 787 788 /* Some devices can not handle block counts above 0xffff despite 789 * supporting WRITE SAME(16). Consequently we default to 64k 790 * blocks per I/O unless the device explicitly advertises a 791 * bigger limit. 792 */ 793 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) 794 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 795 (u32)SD_MAX_WS16_BLOCKS); 796 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes) 797 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 798 (u32)SD_MAX_WS10_BLOCKS); 799 else { 800 sdkp->device->no_write_same = 1; 801 sdkp->max_ws_blocks = 0; 802 } 803 804 out: 805 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks * 806 (logical_block_size >> 9)); 807 } 808 809 /** 810 * sd_setup_write_same_cmnd - write the same data to multiple blocks 811 * @cmd: command to prepare 812 * 813 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on 814 * preference indicated by target device. 815 **/ 816 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd) 817 { 818 struct request *rq = cmd->request; 819 struct scsi_device *sdp = cmd->device; 820 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 821 struct bio *bio = rq->bio; 822 sector_t sector = blk_rq_pos(rq); 823 unsigned int nr_sectors = blk_rq_sectors(rq); 824 unsigned int nr_bytes = blk_rq_bytes(rq); 825 int ret; 826 827 if (sdkp->device->no_write_same) 828 return BLKPREP_KILL; 829 830 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size); 831 832 sector >>= ilog2(sdp->sector_size) - 9; 833 nr_sectors >>= ilog2(sdp->sector_size) - 9; 834 835 rq->timeout = SD_WRITE_SAME_TIMEOUT; 836 837 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) { 838 cmd->cmd_len = 16; 839 cmd->cmnd[0] = WRITE_SAME_16; 840 put_unaligned_be64(sector, &cmd->cmnd[2]); 841 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); 842 } else { 843 cmd->cmd_len = 10; 844 cmd->cmnd[0] = WRITE_SAME; 845 put_unaligned_be32(sector, &cmd->cmnd[2]); 846 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); 847 } 848 849 cmd->transfersize = sdp->sector_size; 850 cmd->allowed = SD_MAX_RETRIES; 851 852 /* 853 * For WRITE_SAME the data transferred in the DATA IN buffer is 854 * different from the amount of data actually written to the target. 855 * 856 * We set up __data_len to the amount of data transferred from the 857 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list 858 * to transfer a single sector of data first, but then reset it to 859 * the amount of data to be written right after so that the I/O path 860 * knows how much to actually write. 861 */ 862 rq->__data_len = sdp->sector_size; 863 ret = scsi_init_io(cmd); 864 rq->__data_len = nr_bytes; 865 return ret; 866 } 867 868 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd) 869 { 870 struct request *rq = cmd->request; 871 872 /* flush requests don't perform I/O, zero the S/G table */ 873 memset(&cmd->sdb, 0, sizeof(cmd->sdb)); 874 875 cmd->cmnd[0] = SYNCHRONIZE_CACHE; 876 cmd->cmd_len = 10; 877 cmd->transfersize = 0; 878 cmd->allowed = SD_MAX_RETRIES; 879 880 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER; 881 return BLKPREP_OK; 882 } 883 884 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt) 885 { 886 struct request *rq = SCpnt->request; 887 struct scsi_device *sdp = SCpnt->device; 888 struct gendisk *disk = rq->rq_disk; 889 struct scsi_disk *sdkp; 890 sector_t block = blk_rq_pos(rq); 891 sector_t threshold; 892 unsigned int this_count = blk_rq_sectors(rq); 893 unsigned int dif, dix; 894 int ret; 895 unsigned char protect; 896 897 ret = scsi_init_io(SCpnt); 898 if (ret != BLKPREP_OK) 899 goto out; 900 SCpnt = rq->special; 901 sdkp = scsi_disk(disk); 902 903 /* from here on until we're complete, any goto out 904 * is used for a killable error condition */ 905 ret = BLKPREP_KILL; 906 907 SCSI_LOG_HLQUEUE(1, 908 scmd_printk(KERN_INFO, SCpnt, 909 "%s: block=%llu, count=%d\n", 910 __func__, (unsigned long long)block, this_count)); 911 912 if (!sdp || !scsi_device_online(sdp) || 913 block + blk_rq_sectors(rq) > get_capacity(disk)) { 914 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 915 "Finishing %u sectors\n", 916 blk_rq_sectors(rq))); 917 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 918 "Retry with 0x%p\n", SCpnt)); 919 goto out; 920 } 921 922 if (sdp->changed) { 923 /* 924 * quietly refuse to do anything to a changed disc until 925 * the changed bit has been reset 926 */ 927 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ 928 goto out; 929 } 930 931 /* 932 * Some SD card readers can't handle multi-sector accesses which touch 933 * the last one or two hardware sectors. Split accesses as needed. 934 */ 935 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 936 (sdp->sector_size / 512); 937 938 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 939 if (block < threshold) { 940 /* Access up to the threshold but not beyond */ 941 this_count = threshold - block; 942 } else { 943 /* Access only a single hardware sector */ 944 this_count = sdp->sector_size / 512; 945 } 946 } 947 948 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 949 (unsigned long long)block)); 950 951 /* 952 * If we have a 1K hardware sectorsize, prevent access to single 953 * 512 byte sectors. In theory we could handle this - in fact 954 * the scsi cdrom driver must be able to handle this because 955 * we typically use 1K blocksizes, and cdroms typically have 956 * 2K hardware sectorsizes. Of course, things are simpler 957 * with the cdrom, since it is read-only. For performance 958 * reasons, the filesystems should be able to handle this 959 * and not force the scsi disk driver to use bounce buffers 960 * for this. 961 */ 962 if (sdp->sector_size == 1024) { 963 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 964 scmd_printk(KERN_ERR, SCpnt, 965 "Bad block number requested\n"); 966 goto out; 967 } else { 968 block = block >> 1; 969 this_count = this_count >> 1; 970 } 971 } 972 if (sdp->sector_size == 2048) { 973 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 974 scmd_printk(KERN_ERR, SCpnt, 975 "Bad block number requested\n"); 976 goto out; 977 } else { 978 block = block >> 2; 979 this_count = this_count >> 2; 980 } 981 } 982 if (sdp->sector_size == 4096) { 983 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 984 scmd_printk(KERN_ERR, SCpnt, 985 "Bad block number requested\n"); 986 goto out; 987 } else { 988 block = block >> 3; 989 this_count = this_count >> 3; 990 } 991 } 992 if (rq_data_dir(rq) == WRITE) { 993 SCpnt->cmnd[0] = WRITE_6; 994 995 if (blk_integrity_rq(rq)) 996 sd_dif_prepare(SCpnt); 997 998 } else if (rq_data_dir(rq) == READ) { 999 SCpnt->cmnd[0] = READ_6; 1000 } else { 1001 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags); 1002 goto out; 1003 } 1004 1005 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 1006 "%s %d/%u 512 byte blocks.\n", 1007 (rq_data_dir(rq) == WRITE) ? 1008 "writing" : "reading", this_count, 1009 blk_rq_sectors(rq))); 1010 1011 dix = scsi_prot_sg_count(SCpnt); 1012 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type); 1013 1014 if (dif || dix) 1015 protect = sd_setup_protect_cmnd(SCpnt, dix, dif); 1016 else 1017 protect = 0; 1018 1019 if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) { 1020 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 1021 1022 if (unlikely(SCpnt->cmnd == NULL)) { 1023 ret = BLKPREP_DEFER; 1024 goto out; 1025 } 1026 1027 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 1028 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 1029 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 1030 SCpnt->cmnd[7] = 0x18; 1031 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 1032 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1033 1034 /* LBA */ 1035 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1036 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1037 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1038 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1039 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 1040 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 1041 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 1042 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 1043 1044 /* Expected Indirect LBA */ 1045 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 1046 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 1047 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 1048 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 1049 1050 /* Transfer length */ 1051 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 1052 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 1053 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 1054 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 1055 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) { 1056 SCpnt->cmnd[0] += READ_16 - READ_6; 1057 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1058 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1059 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1060 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1061 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1062 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 1063 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 1064 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 1065 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 1066 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 1067 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 1068 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 1069 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 1070 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 1071 } else if ((this_count > 0xff) || (block > 0x1fffff) || 1072 scsi_device_protection(SCpnt->device) || 1073 SCpnt->device->use_10_for_rw) { 1074 SCpnt->cmnd[0] += READ_10 - READ_6; 1075 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1076 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 1077 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 1078 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 1079 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 1080 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 1081 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 1082 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 1083 } else { 1084 if (unlikely(rq->cmd_flags & REQ_FUA)) { 1085 /* 1086 * This happens only if this drive failed 1087 * 10byte rw command with ILLEGAL_REQUEST 1088 * during operation and thus turned off 1089 * use_10_for_rw. 1090 */ 1091 scmd_printk(KERN_ERR, SCpnt, 1092 "FUA write on READ/WRITE(6) drive\n"); 1093 goto out; 1094 } 1095 1096 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 1097 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 1098 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 1099 SCpnt->cmnd[4] = (unsigned char) this_count; 1100 SCpnt->cmnd[5] = 0; 1101 } 1102 SCpnt->sdb.length = this_count * sdp->sector_size; 1103 1104 /* 1105 * We shouldn't disconnect in the middle of a sector, so with a dumb 1106 * host adapter, it's safe to assume that we can at least transfer 1107 * this many bytes between each connect / disconnect. 1108 */ 1109 SCpnt->transfersize = sdp->sector_size; 1110 SCpnt->underflow = this_count << 9; 1111 SCpnt->allowed = SD_MAX_RETRIES; 1112 1113 /* 1114 * This indicates that the command is ready from our end to be 1115 * queued. 1116 */ 1117 ret = BLKPREP_OK; 1118 out: 1119 return ret; 1120 } 1121 1122 static int sd_init_command(struct scsi_cmnd *cmd) 1123 { 1124 struct request *rq = cmd->request; 1125 1126 if (rq->cmd_flags & REQ_DISCARD) 1127 return sd_setup_discard_cmnd(cmd); 1128 else if (rq->cmd_flags & REQ_WRITE_SAME) 1129 return sd_setup_write_same_cmnd(cmd); 1130 else if (rq->cmd_flags & REQ_FLUSH) 1131 return sd_setup_flush_cmnd(cmd); 1132 else 1133 return sd_setup_read_write_cmnd(cmd); 1134 } 1135 1136 static void sd_uninit_command(struct scsi_cmnd *SCpnt) 1137 { 1138 struct request *rq = SCpnt->request; 1139 1140 if (rq->cmd_flags & REQ_DISCARD) 1141 __free_page(rq->completion_data); 1142 1143 if (SCpnt->cmnd != rq->cmd) { 1144 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1145 SCpnt->cmnd = NULL; 1146 SCpnt->cmd_len = 0; 1147 } 1148 } 1149 1150 /** 1151 * sd_open - open a scsi disk device 1152 * @inode: only i_rdev member may be used 1153 * @filp: only f_mode and f_flags may be used 1154 * 1155 * Returns 0 if successful. Returns a negated errno value in case 1156 * of error. 1157 * 1158 * Note: This can be called from a user context (e.g. fsck(1) ) 1159 * or from within the kernel (e.g. as a result of a mount(1) ). 1160 * In the latter case @inode and @filp carry an abridged amount 1161 * of information as noted above. 1162 * 1163 * Locking: called with bdev->bd_mutex held. 1164 **/ 1165 static int sd_open(struct block_device *bdev, fmode_t mode) 1166 { 1167 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 1168 struct scsi_device *sdev; 1169 int retval; 1170 1171 if (!sdkp) 1172 return -ENXIO; 1173 1174 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 1175 1176 sdev = sdkp->device; 1177 1178 /* 1179 * If the device is in error recovery, wait until it is done. 1180 * If the device is offline, then disallow any access to it. 1181 */ 1182 retval = -ENXIO; 1183 if (!scsi_block_when_processing_errors(sdev)) 1184 goto error_out; 1185 1186 if (sdev->removable || sdkp->write_prot) 1187 check_disk_change(bdev); 1188 1189 /* 1190 * If the drive is empty, just let the open fail. 1191 */ 1192 retval = -ENOMEDIUM; 1193 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 1194 goto error_out; 1195 1196 /* 1197 * If the device has the write protect tab set, have the open fail 1198 * if the user expects to be able to write to the thing. 1199 */ 1200 retval = -EROFS; 1201 if (sdkp->write_prot && (mode & FMODE_WRITE)) 1202 goto error_out; 1203 1204 /* 1205 * It is possible that the disk changing stuff resulted in 1206 * the device being taken offline. If this is the case, 1207 * report this to the user, and don't pretend that the 1208 * open actually succeeded. 1209 */ 1210 retval = -ENXIO; 1211 if (!scsi_device_online(sdev)) 1212 goto error_out; 1213 1214 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 1215 if (scsi_block_when_processing_errors(sdev)) 1216 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 1217 } 1218 1219 return 0; 1220 1221 error_out: 1222 scsi_disk_put(sdkp); 1223 return retval; 1224 } 1225 1226 /** 1227 * sd_release - invoked when the (last) close(2) is called on this 1228 * scsi disk. 1229 * @inode: only i_rdev member may be used 1230 * @filp: only f_mode and f_flags may be used 1231 * 1232 * Returns 0. 1233 * 1234 * Note: may block (uninterruptible) if error recovery is underway 1235 * on this disk. 1236 * 1237 * Locking: called with bdev->bd_mutex held. 1238 **/ 1239 static void sd_release(struct gendisk *disk, fmode_t mode) 1240 { 1241 struct scsi_disk *sdkp = scsi_disk(disk); 1242 struct scsi_device *sdev = sdkp->device; 1243 1244 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 1245 1246 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 1247 if (scsi_block_when_processing_errors(sdev)) 1248 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 1249 } 1250 1251 /* 1252 * XXX and what if there are packets in flight and this close() 1253 * XXX is followed by a "rmmod sd_mod"? 1254 */ 1255 1256 scsi_disk_put(sdkp); 1257 } 1258 1259 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1260 { 1261 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 1262 struct scsi_device *sdp = sdkp->device; 1263 struct Scsi_Host *host = sdp->host; 1264 int diskinfo[4]; 1265 1266 /* default to most commonly used values */ 1267 diskinfo[0] = 0x40; /* 1 << 6 */ 1268 diskinfo[1] = 0x20; /* 1 << 5 */ 1269 diskinfo[2] = sdkp->capacity >> 11; 1270 1271 /* override with calculated, extended default, or driver values */ 1272 if (host->hostt->bios_param) 1273 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 1274 else 1275 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 1276 1277 geo->heads = diskinfo[0]; 1278 geo->sectors = diskinfo[1]; 1279 geo->cylinders = diskinfo[2]; 1280 return 0; 1281 } 1282 1283 /** 1284 * sd_ioctl - process an ioctl 1285 * @inode: only i_rdev/i_bdev members may be used 1286 * @filp: only f_mode and f_flags may be used 1287 * @cmd: ioctl command number 1288 * @arg: this is third argument given to ioctl(2) system call. 1289 * Often contains a pointer. 1290 * 1291 * Returns 0 if successful (some ioctls return positive numbers on 1292 * success as well). Returns a negated errno value in case of error. 1293 * 1294 * Note: most ioctls are forward onto the block subsystem or further 1295 * down in the scsi subsystem. 1296 **/ 1297 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 1298 unsigned int cmd, unsigned long arg) 1299 { 1300 struct gendisk *disk = bdev->bd_disk; 1301 struct scsi_disk *sdkp = scsi_disk(disk); 1302 struct scsi_device *sdp = sdkp->device; 1303 void __user *p = (void __user *)arg; 1304 int error; 1305 1306 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " 1307 "cmd=0x%x\n", disk->disk_name, cmd)); 1308 1309 error = scsi_verify_blk_ioctl(bdev, cmd); 1310 if (error < 0) 1311 return error; 1312 1313 /* 1314 * If we are in the middle of error recovery, don't let anyone 1315 * else try and use this device. Also, if error recovery fails, it 1316 * may try and take the device offline, in which case all further 1317 * access to the device is prohibited. 1318 */ 1319 error = scsi_ioctl_block_when_processing_errors(sdp, cmd, 1320 (mode & FMODE_NDELAY) != 0); 1321 if (error) 1322 goto out; 1323 1324 /* 1325 * Send SCSI addressing ioctls directly to mid level, send other 1326 * ioctls to block level and then onto mid level if they can't be 1327 * resolved. 1328 */ 1329 switch (cmd) { 1330 case SCSI_IOCTL_GET_IDLUN: 1331 case SCSI_IOCTL_GET_BUS_NUMBER: 1332 error = scsi_ioctl(sdp, cmd, p); 1333 break; 1334 default: 1335 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); 1336 if (error != -ENOTTY) 1337 break; 1338 error = scsi_ioctl(sdp, cmd, p); 1339 break; 1340 } 1341 out: 1342 return error; 1343 } 1344 1345 static void set_media_not_present(struct scsi_disk *sdkp) 1346 { 1347 if (sdkp->media_present) 1348 sdkp->device->changed = 1; 1349 1350 if (sdkp->device->removable) { 1351 sdkp->media_present = 0; 1352 sdkp->capacity = 0; 1353 } 1354 } 1355 1356 static int media_not_present(struct scsi_disk *sdkp, 1357 struct scsi_sense_hdr *sshdr) 1358 { 1359 if (!scsi_sense_valid(sshdr)) 1360 return 0; 1361 1362 /* not invoked for commands that could return deferred errors */ 1363 switch (sshdr->sense_key) { 1364 case UNIT_ATTENTION: 1365 case NOT_READY: 1366 /* medium not present */ 1367 if (sshdr->asc == 0x3A) { 1368 set_media_not_present(sdkp); 1369 return 1; 1370 } 1371 } 1372 return 0; 1373 } 1374 1375 /** 1376 * sd_check_events - check media events 1377 * @disk: kernel device descriptor 1378 * @clearing: disk events currently being cleared 1379 * 1380 * Returns mask of DISK_EVENT_*. 1381 * 1382 * Note: this function is invoked from the block subsystem. 1383 **/ 1384 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) 1385 { 1386 struct scsi_disk *sdkp = scsi_disk(disk); 1387 struct scsi_device *sdp = sdkp->device; 1388 struct scsi_sense_hdr *sshdr = NULL; 1389 int retval; 1390 1391 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); 1392 1393 /* 1394 * If the device is offline, don't send any commands - just pretend as 1395 * if the command failed. If the device ever comes back online, we 1396 * can deal with it then. It is only because of unrecoverable errors 1397 * that we would ever take a device offline in the first place. 1398 */ 1399 if (!scsi_device_online(sdp)) { 1400 set_media_not_present(sdkp); 1401 goto out; 1402 } 1403 1404 /* 1405 * Using TEST_UNIT_READY enables differentiation between drive with 1406 * no cartridge loaded - NOT READY, drive with changed cartridge - 1407 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1408 * 1409 * Drives that auto spin down. eg iomega jaz 1G, will be started 1410 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1411 * sd_revalidate() is called. 1412 */ 1413 retval = -ENODEV; 1414 1415 if (scsi_block_when_processing_errors(sdp)) { 1416 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 1417 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1418 sshdr); 1419 } 1420 1421 /* failed to execute TUR, assume media not present */ 1422 if (host_byte(retval)) { 1423 set_media_not_present(sdkp); 1424 goto out; 1425 } 1426 1427 if (media_not_present(sdkp, sshdr)) 1428 goto out; 1429 1430 /* 1431 * For removable scsi disk we have to recognise the presence 1432 * of a disk in the drive. 1433 */ 1434 if (!sdkp->media_present) 1435 sdp->changed = 1; 1436 sdkp->media_present = 1; 1437 out: 1438 /* 1439 * sdp->changed is set under the following conditions: 1440 * 1441 * Medium present state has changed in either direction. 1442 * Device has indicated UNIT_ATTENTION. 1443 */ 1444 kfree(sshdr); 1445 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1446 sdp->changed = 0; 1447 return retval; 1448 } 1449 1450 static int sd_sync_cache(struct scsi_disk *sdkp) 1451 { 1452 int retries, res; 1453 struct scsi_device *sdp = sdkp->device; 1454 const int timeout = sdp->request_queue->rq_timeout 1455 * SD_FLUSH_TIMEOUT_MULTIPLIER; 1456 struct scsi_sense_hdr sshdr; 1457 1458 if (!scsi_device_online(sdp)) 1459 return -ENODEV; 1460 1461 for (retries = 3; retries > 0; --retries) { 1462 unsigned char cmd[10] = { 0 }; 1463 1464 cmd[0] = SYNCHRONIZE_CACHE; 1465 /* 1466 * Leave the rest of the command zero to indicate 1467 * flush everything. 1468 */ 1469 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, 1470 &sshdr, timeout, SD_MAX_RETRIES, 1471 NULL, REQ_PM); 1472 if (res == 0) 1473 break; 1474 } 1475 1476 if (res) { 1477 sd_print_result(sdkp, "Synchronize Cache(10) failed", res); 1478 1479 if (driver_byte(res) & DRIVER_SENSE) 1480 sd_print_sense_hdr(sdkp, &sshdr); 1481 /* we need to evaluate the error return */ 1482 if (scsi_sense_valid(&sshdr) && 1483 (sshdr.asc == 0x3a || /* medium not present */ 1484 sshdr.asc == 0x20)) /* invalid command */ 1485 /* this is no error here */ 1486 return 0; 1487 1488 switch (host_byte(res)) { 1489 /* ignore errors due to racing a disconnection */ 1490 case DID_BAD_TARGET: 1491 case DID_NO_CONNECT: 1492 return 0; 1493 /* signal the upper layer it might try again */ 1494 case DID_BUS_BUSY: 1495 case DID_IMM_RETRY: 1496 case DID_REQUEUE: 1497 case DID_SOFT_ERROR: 1498 return -EBUSY; 1499 default: 1500 return -EIO; 1501 } 1502 } 1503 return 0; 1504 } 1505 1506 static void sd_rescan(struct device *dev) 1507 { 1508 struct scsi_disk *sdkp = dev_get_drvdata(dev); 1509 1510 revalidate_disk(sdkp->disk); 1511 } 1512 1513 1514 #ifdef CONFIG_COMPAT 1515 /* 1516 * This gets directly called from VFS. When the ioctl 1517 * is not recognized we go back to the other translation paths. 1518 */ 1519 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1520 unsigned int cmd, unsigned long arg) 1521 { 1522 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1523 int error; 1524 1525 error = scsi_ioctl_block_when_processing_errors(sdev, cmd, 1526 (mode & FMODE_NDELAY) != 0); 1527 if (error) 1528 return error; 1529 1530 /* 1531 * Let the static ioctl translation table take care of it. 1532 */ 1533 if (!sdev->host->hostt->compat_ioctl) 1534 return -ENOIOCTLCMD; 1535 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1536 } 1537 #endif 1538 1539 static char sd_pr_type(enum pr_type type) 1540 { 1541 switch (type) { 1542 case PR_WRITE_EXCLUSIVE: 1543 return 0x01; 1544 case PR_EXCLUSIVE_ACCESS: 1545 return 0x03; 1546 case PR_WRITE_EXCLUSIVE_REG_ONLY: 1547 return 0x05; 1548 case PR_EXCLUSIVE_ACCESS_REG_ONLY: 1549 return 0x06; 1550 case PR_WRITE_EXCLUSIVE_ALL_REGS: 1551 return 0x07; 1552 case PR_EXCLUSIVE_ACCESS_ALL_REGS: 1553 return 0x08; 1554 default: 1555 return 0; 1556 } 1557 }; 1558 1559 static int sd_pr_command(struct block_device *bdev, u8 sa, 1560 u64 key, u64 sa_key, u8 type, u8 flags) 1561 { 1562 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1563 struct scsi_sense_hdr sshdr; 1564 int result; 1565 u8 cmd[16] = { 0, }; 1566 u8 data[24] = { 0, }; 1567 1568 cmd[0] = PERSISTENT_RESERVE_OUT; 1569 cmd[1] = sa; 1570 cmd[2] = type; 1571 put_unaligned_be32(sizeof(data), &cmd[5]); 1572 1573 put_unaligned_be64(key, &data[0]); 1574 put_unaligned_be64(sa_key, &data[8]); 1575 data[20] = flags; 1576 1577 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data), 1578 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1579 1580 if ((driver_byte(result) & DRIVER_SENSE) && 1581 (scsi_sense_valid(&sshdr))) { 1582 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result); 1583 scsi_print_sense_hdr(sdev, NULL, &sshdr); 1584 } 1585 1586 return result; 1587 } 1588 1589 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key, 1590 u32 flags) 1591 { 1592 if (flags & ~PR_FL_IGNORE_KEY) 1593 return -EOPNOTSUPP; 1594 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00, 1595 old_key, new_key, 0, 1596 (1 << 0) /* APTPL */ | 1597 (1 << 2) /* ALL_TG_PT */); 1598 } 1599 1600 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type, 1601 u32 flags) 1602 { 1603 if (flags) 1604 return -EOPNOTSUPP; 1605 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0); 1606 } 1607 1608 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type) 1609 { 1610 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0); 1611 } 1612 1613 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key, 1614 enum pr_type type, bool abort) 1615 { 1616 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key, 1617 sd_pr_type(type), 0); 1618 } 1619 1620 static int sd_pr_clear(struct block_device *bdev, u64 key) 1621 { 1622 return sd_pr_command(bdev, 0x03, key, 0, 0, 0); 1623 } 1624 1625 static const struct pr_ops sd_pr_ops = { 1626 .pr_register = sd_pr_register, 1627 .pr_reserve = sd_pr_reserve, 1628 .pr_release = sd_pr_release, 1629 .pr_preempt = sd_pr_preempt, 1630 .pr_clear = sd_pr_clear, 1631 }; 1632 1633 static const struct block_device_operations sd_fops = { 1634 .owner = THIS_MODULE, 1635 .open = sd_open, 1636 .release = sd_release, 1637 .ioctl = sd_ioctl, 1638 .getgeo = sd_getgeo, 1639 #ifdef CONFIG_COMPAT 1640 .compat_ioctl = sd_compat_ioctl, 1641 #endif 1642 .check_events = sd_check_events, 1643 .revalidate_disk = sd_revalidate_disk, 1644 .unlock_native_capacity = sd_unlock_native_capacity, 1645 .pr_ops = &sd_pr_ops, 1646 }; 1647 1648 /** 1649 * sd_eh_action - error handling callback 1650 * @scmd: sd-issued command that has failed 1651 * @eh_disp: The recovery disposition suggested by the midlayer 1652 * 1653 * This function is called by the SCSI midlayer upon completion of an 1654 * error test command (currently TEST UNIT READY). The result of sending 1655 * the eh command is passed in eh_disp. We're looking for devices that 1656 * fail medium access commands but are OK with non access commands like 1657 * test unit ready (so wrongly see the device as having a successful 1658 * recovery) 1659 **/ 1660 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp) 1661 { 1662 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1663 1664 if (!scsi_device_online(scmd->device) || 1665 !scsi_medium_access_command(scmd) || 1666 host_byte(scmd->result) != DID_TIME_OUT || 1667 eh_disp != SUCCESS) 1668 return eh_disp; 1669 1670 /* 1671 * The device has timed out executing a medium access command. 1672 * However, the TEST UNIT READY command sent during error 1673 * handling completed successfully. Either the device is in the 1674 * process of recovering or has it suffered an internal failure 1675 * that prevents access to the storage medium. 1676 */ 1677 sdkp->medium_access_timed_out++; 1678 1679 /* 1680 * If the device keeps failing read/write commands but TEST UNIT 1681 * READY always completes successfully we assume that medium 1682 * access is no longer possible and take the device offline. 1683 */ 1684 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { 1685 scmd_printk(KERN_ERR, scmd, 1686 "Medium access timeout failure. Offlining disk!\n"); 1687 scsi_device_set_state(scmd->device, SDEV_OFFLINE); 1688 1689 return FAILED; 1690 } 1691 1692 return eh_disp; 1693 } 1694 1695 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1696 { 1697 u64 start_lba = blk_rq_pos(scmd->request); 1698 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1699 u64 factor = scmd->device->sector_size / 512; 1700 u64 bad_lba; 1701 int info_valid; 1702 /* 1703 * resid is optional but mostly filled in. When it's unused, 1704 * its value is zero, so we assume the whole buffer transferred 1705 */ 1706 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 1707 unsigned int good_bytes; 1708 1709 if (scmd->request->cmd_type != REQ_TYPE_FS) 1710 return 0; 1711 1712 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1713 SCSI_SENSE_BUFFERSIZE, 1714 &bad_lba); 1715 if (!info_valid) 1716 return 0; 1717 1718 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1719 return 0; 1720 1721 /* be careful ... don't want any overflows */ 1722 do_div(start_lba, factor); 1723 do_div(end_lba, factor); 1724 1725 /* The bad lba was reported incorrectly, we have no idea where 1726 * the error is. 1727 */ 1728 if (bad_lba < start_lba || bad_lba >= end_lba) 1729 return 0; 1730 1731 /* This computation should always be done in terms of 1732 * the resolution of the device's medium. 1733 */ 1734 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; 1735 return min(good_bytes, transferred); 1736 } 1737 1738 /** 1739 * sd_done - bottom half handler: called when the lower level 1740 * driver has completed (successfully or otherwise) a scsi command. 1741 * @SCpnt: mid-level's per command structure. 1742 * 1743 * Note: potentially run from within an ISR. Must not block. 1744 **/ 1745 static int sd_done(struct scsi_cmnd *SCpnt) 1746 { 1747 int result = SCpnt->result; 1748 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1749 struct scsi_sense_hdr sshdr; 1750 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1751 struct request *req = SCpnt->request; 1752 int sense_valid = 0; 1753 int sense_deferred = 0; 1754 unsigned char op = SCpnt->cmnd[0]; 1755 unsigned char unmap = SCpnt->cmnd[1] & 8; 1756 1757 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) { 1758 if (!result) { 1759 good_bytes = blk_rq_bytes(req); 1760 scsi_set_resid(SCpnt, 0); 1761 } else { 1762 good_bytes = 0; 1763 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 1764 } 1765 } 1766 1767 if (result) { 1768 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1769 if (sense_valid) 1770 sense_deferred = scsi_sense_is_deferred(&sshdr); 1771 } 1772 sdkp->medium_access_timed_out = 0; 1773 1774 if (driver_byte(result) != DRIVER_SENSE && 1775 (!sense_valid || sense_deferred)) 1776 goto out; 1777 1778 switch (sshdr.sense_key) { 1779 case HARDWARE_ERROR: 1780 case MEDIUM_ERROR: 1781 good_bytes = sd_completed_bytes(SCpnt); 1782 break; 1783 case RECOVERED_ERROR: 1784 good_bytes = scsi_bufflen(SCpnt); 1785 break; 1786 case NO_SENSE: 1787 /* This indicates a false check condition, so ignore it. An 1788 * unknown amount of data was transferred so treat it as an 1789 * error. 1790 */ 1791 SCpnt->result = 0; 1792 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1793 break; 1794 case ABORTED_COMMAND: 1795 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 1796 good_bytes = sd_completed_bytes(SCpnt); 1797 break; 1798 case ILLEGAL_REQUEST: 1799 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */ 1800 good_bytes = sd_completed_bytes(SCpnt); 1801 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ 1802 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) { 1803 switch (op) { 1804 case UNMAP: 1805 sd_config_discard(sdkp, SD_LBP_DISABLE); 1806 break; 1807 case WRITE_SAME_16: 1808 case WRITE_SAME: 1809 if (unmap) 1810 sd_config_discard(sdkp, SD_LBP_DISABLE); 1811 else { 1812 sdkp->device->no_write_same = 1; 1813 sd_config_write_same(sdkp); 1814 1815 good_bytes = 0; 1816 req->__data_len = blk_rq_bytes(req); 1817 req->cmd_flags |= REQ_QUIET; 1818 } 1819 } 1820 } 1821 break; 1822 default: 1823 break; 1824 } 1825 out: 1826 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1827 "sd_done: completed %d of %d bytes\n", 1828 good_bytes, scsi_bufflen(SCpnt))); 1829 1830 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1831 sd_dif_complete(SCpnt, good_bytes); 1832 1833 return good_bytes; 1834 } 1835 1836 /* 1837 * spinup disk - called only in sd_revalidate_disk() 1838 */ 1839 static void 1840 sd_spinup_disk(struct scsi_disk *sdkp) 1841 { 1842 unsigned char cmd[10]; 1843 unsigned long spintime_expire = 0; 1844 int retries, spintime; 1845 unsigned int the_result; 1846 struct scsi_sense_hdr sshdr; 1847 int sense_valid = 0; 1848 1849 spintime = 0; 1850 1851 /* Spin up drives, as required. Only do this at boot time */ 1852 /* Spinup needs to be done for module loads too. */ 1853 do { 1854 retries = 0; 1855 1856 do { 1857 cmd[0] = TEST_UNIT_READY; 1858 memset((void *) &cmd[1], 0, 9); 1859 1860 the_result = scsi_execute_req(sdkp->device, cmd, 1861 DMA_NONE, NULL, 0, 1862 &sshdr, SD_TIMEOUT, 1863 SD_MAX_RETRIES, NULL); 1864 1865 /* 1866 * If the drive has indicated to us that it 1867 * doesn't have any media in it, don't bother 1868 * with any more polling. 1869 */ 1870 if (media_not_present(sdkp, &sshdr)) 1871 return; 1872 1873 if (the_result) 1874 sense_valid = scsi_sense_valid(&sshdr); 1875 retries++; 1876 } while (retries < 3 && 1877 (!scsi_status_is_good(the_result) || 1878 ((driver_byte(the_result) & DRIVER_SENSE) && 1879 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1880 1881 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1882 /* no sense, TUR either succeeded or failed 1883 * with a status error */ 1884 if(!spintime && !scsi_status_is_good(the_result)) { 1885 sd_print_result(sdkp, "Test Unit Ready failed", 1886 the_result); 1887 } 1888 break; 1889 } 1890 1891 /* 1892 * The device does not want the automatic start to be issued. 1893 */ 1894 if (sdkp->device->no_start_on_add) 1895 break; 1896 1897 if (sense_valid && sshdr.sense_key == NOT_READY) { 1898 if (sshdr.asc == 4 && sshdr.ascq == 3) 1899 break; /* manual intervention required */ 1900 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1901 break; /* standby */ 1902 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1903 break; /* unavailable */ 1904 /* 1905 * Issue command to spin up drive when not ready 1906 */ 1907 if (!spintime) { 1908 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1909 cmd[0] = START_STOP; 1910 cmd[1] = 1; /* Return immediately */ 1911 memset((void *) &cmd[2], 0, 8); 1912 cmd[4] = 1; /* Start spin cycle */ 1913 if (sdkp->device->start_stop_pwr_cond) 1914 cmd[4] |= 1 << 4; 1915 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1916 NULL, 0, &sshdr, 1917 SD_TIMEOUT, SD_MAX_RETRIES, 1918 NULL); 1919 spintime_expire = jiffies + 100 * HZ; 1920 spintime = 1; 1921 } 1922 /* Wait 1 second for next try */ 1923 msleep(1000); 1924 printk("."); 1925 1926 /* 1927 * Wait for USB flash devices with slow firmware. 1928 * Yes, this sense key/ASC combination shouldn't 1929 * occur here. It's characteristic of these devices. 1930 */ 1931 } else if (sense_valid && 1932 sshdr.sense_key == UNIT_ATTENTION && 1933 sshdr.asc == 0x28) { 1934 if (!spintime) { 1935 spintime_expire = jiffies + 5 * HZ; 1936 spintime = 1; 1937 } 1938 /* Wait 1 second for next try */ 1939 msleep(1000); 1940 } else { 1941 /* we don't understand the sense code, so it's 1942 * probably pointless to loop */ 1943 if(!spintime) { 1944 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1945 sd_print_sense_hdr(sdkp, &sshdr); 1946 } 1947 break; 1948 } 1949 1950 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1951 1952 if (spintime) { 1953 if (scsi_status_is_good(the_result)) 1954 printk("ready\n"); 1955 else 1956 printk("not responding...\n"); 1957 } 1958 } 1959 1960 1961 /* 1962 * Determine whether disk supports Data Integrity Field. 1963 */ 1964 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1965 { 1966 struct scsi_device *sdp = sdkp->device; 1967 u8 type; 1968 int ret = 0; 1969 1970 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1971 return ret; 1972 1973 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1974 1975 if (type > SD_DIF_TYPE3_PROTECTION) 1976 ret = -ENODEV; 1977 else if (scsi_host_dif_capable(sdp->host, type)) 1978 ret = 1; 1979 1980 if (sdkp->first_scan || type != sdkp->protection_type) 1981 switch (ret) { 1982 case -ENODEV: 1983 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ 1984 " protection type %u. Disabling disk!\n", 1985 type); 1986 break; 1987 case 1: 1988 sd_printk(KERN_NOTICE, sdkp, 1989 "Enabling DIF Type %u protection\n", type); 1990 break; 1991 case 0: 1992 sd_printk(KERN_NOTICE, sdkp, 1993 "Disabling DIF Type %u protection\n", type); 1994 break; 1995 } 1996 1997 sdkp->protection_type = type; 1998 1999 return ret; 2000 } 2001 2002 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 2003 struct scsi_sense_hdr *sshdr, int sense_valid, 2004 int the_result) 2005 { 2006 if (driver_byte(the_result) & DRIVER_SENSE) 2007 sd_print_sense_hdr(sdkp, sshdr); 2008 else 2009 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 2010 2011 /* 2012 * Set dirty bit for removable devices if not ready - 2013 * sometimes drives will not report this properly. 2014 */ 2015 if (sdp->removable && 2016 sense_valid && sshdr->sense_key == NOT_READY) 2017 set_media_not_present(sdkp); 2018 2019 /* 2020 * We used to set media_present to 0 here to indicate no media 2021 * in the drive, but some drives fail read capacity even with 2022 * media present, so we can't do that. 2023 */ 2024 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 2025 } 2026 2027 #define RC16_LEN 32 2028 #if RC16_LEN > SD_BUF_SIZE 2029 #error RC16_LEN must not be more than SD_BUF_SIZE 2030 #endif 2031 2032 #define READ_CAPACITY_RETRIES_ON_RESET 10 2033 2034 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 2035 unsigned char *buffer) 2036 { 2037 unsigned char cmd[16]; 2038 struct scsi_sense_hdr sshdr; 2039 int sense_valid = 0; 2040 int the_result; 2041 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2042 unsigned int alignment; 2043 unsigned long long lba; 2044 unsigned sector_size; 2045 2046 if (sdp->no_read_capacity_16) 2047 return -EINVAL; 2048 2049 do { 2050 memset(cmd, 0, 16); 2051 cmd[0] = SERVICE_ACTION_IN_16; 2052 cmd[1] = SAI_READ_CAPACITY_16; 2053 cmd[13] = RC16_LEN; 2054 memset(buffer, 0, RC16_LEN); 2055 2056 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2057 buffer, RC16_LEN, &sshdr, 2058 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2059 2060 if (media_not_present(sdkp, &sshdr)) 2061 return -ENODEV; 2062 2063 if (the_result) { 2064 sense_valid = scsi_sense_valid(&sshdr); 2065 if (sense_valid && 2066 sshdr.sense_key == ILLEGAL_REQUEST && 2067 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 2068 sshdr.ascq == 0x00) 2069 /* Invalid Command Operation Code or 2070 * Invalid Field in CDB, just retry 2071 * silently with RC10 */ 2072 return -EINVAL; 2073 if (sense_valid && 2074 sshdr.sense_key == UNIT_ATTENTION && 2075 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2076 /* Device reset might occur several times, 2077 * give it one more chance */ 2078 if (--reset_retries > 0) 2079 continue; 2080 } 2081 retries--; 2082 2083 } while (the_result && retries); 2084 2085 if (the_result) { 2086 sd_print_result(sdkp, "Read Capacity(16) failed", the_result); 2087 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2088 return -EINVAL; 2089 } 2090 2091 sector_size = get_unaligned_be32(&buffer[8]); 2092 lba = get_unaligned_be64(&buffer[0]); 2093 2094 if (sd_read_protection_type(sdkp, buffer) < 0) { 2095 sdkp->capacity = 0; 2096 return -ENODEV; 2097 } 2098 2099 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 2100 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2101 "kernel compiled with support for large block " 2102 "devices.\n"); 2103 sdkp->capacity = 0; 2104 return -EOVERFLOW; 2105 } 2106 2107 /* Logical blocks per physical block exponent */ 2108 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 2109 2110 /* Lowest aligned logical block */ 2111 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 2112 blk_queue_alignment_offset(sdp->request_queue, alignment); 2113 if (alignment && sdkp->first_scan) 2114 sd_printk(KERN_NOTICE, sdkp, 2115 "physical block alignment offset: %u\n", alignment); 2116 2117 if (buffer[14] & 0x80) { /* LBPME */ 2118 sdkp->lbpme = 1; 2119 2120 if (buffer[14] & 0x40) /* LBPRZ */ 2121 sdkp->lbprz = 1; 2122 2123 sd_config_discard(sdkp, SD_LBP_WS16); 2124 } 2125 2126 sdkp->capacity = lba + 1; 2127 return sector_size; 2128 } 2129 2130 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 2131 unsigned char *buffer) 2132 { 2133 unsigned char cmd[16]; 2134 struct scsi_sense_hdr sshdr; 2135 int sense_valid = 0; 2136 int the_result; 2137 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2138 sector_t lba; 2139 unsigned sector_size; 2140 2141 do { 2142 cmd[0] = READ_CAPACITY; 2143 memset(&cmd[1], 0, 9); 2144 memset(buffer, 0, 8); 2145 2146 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2147 buffer, 8, &sshdr, 2148 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2149 2150 if (media_not_present(sdkp, &sshdr)) 2151 return -ENODEV; 2152 2153 if (the_result) { 2154 sense_valid = scsi_sense_valid(&sshdr); 2155 if (sense_valid && 2156 sshdr.sense_key == UNIT_ATTENTION && 2157 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2158 /* Device reset might occur several times, 2159 * give it one more chance */ 2160 if (--reset_retries > 0) 2161 continue; 2162 } 2163 retries--; 2164 2165 } while (the_result && retries); 2166 2167 if (the_result) { 2168 sd_print_result(sdkp, "Read Capacity(10) failed", the_result); 2169 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2170 return -EINVAL; 2171 } 2172 2173 sector_size = get_unaligned_be32(&buffer[4]); 2174 lba = get_unaligned_be32(&buffer[0]); 2175 2176 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 2177 /* Some buggy (usb cardreader) devices return an lba of 2178 0xffffffff when the want to report a size of 0 (with 2179 which they really mean no media is present) */ 2180 sdkp->capacity = 0; 2181 sdkp->physical_block_size = sector_size; 2182 return sector_size; 2183 } 2184 2185 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 2186 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2187 "kernel compiled with support for large block " 2188 "devices.\n"); 2189 sdkp->capacity = 0; 2190 return -EOVERFLOW; 2191 } 2192 2193 sdkp->capacity = lba + 1; 2194 sdkp->physical_block_size = sector_size; 2195 return sector_size; 2196 } 2197 2198 static int sd_try_rc16_first(struct scsi_device *sdp) 2199 { 2200 if (sdp->host->max_cmd_len < 16) 2201 return 0; 2202 if (sdp->try_rc_10_first) 2203 return 0; 2204 if (sdp->scsi_level > SCSI_SPC_2) 2205 return 1; 2206 if (scsi_device_protection(sdp)) 2207 return 1; 2208 return 0; 2209 } 2210 2211 /* 2212 * read disk capacity 2213 */ 2214 static void 2215 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 2216 { 2217 int sector_size; 2218 struct scsi_device *sdp = sdkp->device; 2219 sector_t old_capacity = sdkp->capacity; 2220 2221 if (sd_try_rc16_first(sdp)) { 2222 sector_size = read_capacity_16(sdkp, sdp, buffer); 2223 if (sector_size == -EOVERFLOW) 2224 goto got_data; 2225 if (sector_size == -ENODEV) 2226 return; 2227 if (sector_size < 0) 2228 sector_size = read_capacity_10(sdkp, sdp, buffer); 2229 if (sector_size < 0) 2230 return; 2231 } else { 2232 sector_size = read_capacity_10(sdkp, sdp, buffer); 2233 if (sector_size == -EOVERFLOW) 2234 goto got_data; 2235 if (sector_size < 0) 2236 return; 2237 if ((sizeof(sdkp->capacity) > 4) && 2238 (sdkp->capacity > 0xffffffffULL)) { 2239 int old_sector_size = sector_size; 2240 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 2241 "Trying to use READ CAPACITY(16).\n"); 2242 sector_size = read_capacity_16(sdkp, sdp, buffer); 2243 if (sector_size < 0) { 2244 sd_printk(KERN_NOTICE, sdkp, 2245 "Using 0xffffffff as device size\n"); 2246 sdkp->capacity = 1 + (sector_t) 0xffffffff; 2247 sector_size = old_sector_size; 2248 goto got_data; 2249 } 2250 } 2251 } 2252 2253 /* Some devices are known to return the total number of blocks, 2254 * not the highest block number. Some devices have versions 2255 * which do this and others which do not. Some devices we might 2256 * suspect of doing this but we don't know for certain. 2257 * 2258 * If we know the reported capacity is wrong, decrement it. If 2259 * we can only guess, then assume the number of blocks is even 2260 * (usually true but not always) and err on the side of lowering 2261 * the capacity. 2262 */ 2263 if (sdp->fix_capacity || 2264 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 2265 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 2266 "from its reported value: %llu\n", 2267 (unsigned long long) sdkp->capacity); 2268 --sdkp->capacity; 2269 } 2270 2271 got_data: 2272 if (sector_size == 0) { 2273 sector_size = 512; 2274 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 2275 "assuming 512.\n"); 2276 } 2277 2278 if (sector_size != 512 && 2279 sector_size != 1024 && 2280 sector_size != 2048 && 2281 sector_size != 4096) { 2282 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 2283 sector_size); 2284 /* 2285 * The user might want to re-format the drive with 2286 * a supported sectorsize. Once this happens, it 2287 * would be relatively trivial to set the thing up. 2288 * For this reason, we leave the thing in the table. 2289 */ 2290 sdkp->capacity = 0; 2291 /* 2292 * set a bogus sector size so the normal read/write 2293 * logic in the block layer will eventually refuse any 2294 * request on this device without tripping over power 2295 * of two sector size assumptions 2296 */ 2297 sector_size = 512; 2298 } 2299 blk_queue_logical_block_size(sdp->request_queue, sector_size); 2300 2301 { 2302 char cap_str_2[10], cap_str_10[10]; 2303 2304 string_get_size(sdkp->capacity, sector_size, 2305 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); 2306 string_get_size(sdkp->capacity, sector_size, 2307 STRING_UNITS_10, cap_str_10, 2308 sizeof(cap_str_10)); 2309 2310 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 2311 sd_printk(KERN_NOTICE, sdkp, 2312 "%llu %d-byte logical blocks: (%s/%s)\n", 2313 (unsigned long long)sdkp->capacity, 2314 sector_size, cap_str_10, cap_str_2); 2315 2316 if (sdkp->physical_block_size != sector_size) 2317 sd_printk(KERN_NOTICE, sdkp, 2318 "%u-byte physical blocks\n", 2319 sdkp->physical_block_size); 2320 } 2321 } 2322 2323 if (sdkp->capacity > 0xffffffff) { 2324 sdp->use_16_for_rw = 1; 2325 sdkp->max_xfer_blocks = SD_MAX_XFER_BLOCKS; 2326 } else 2327 sdkp->max_xfer_blocks = SD_DEF_XFER_BLOCKS; 2328 2329 /* Rescale capacity to 512-byte units */ 2330 if (sector_size == 4096) 2331 sdkp->capacity <<= 3; 2332 else if (sector_size == 2048) 2333 sdkp->capacity <<= 2; 2334 else if (sector_size == 1024) 2335 sdkp->capacity <<= 1; 2336 2337 blk_queue_physical_block_size(sdp->request_queue, 2338 sdkp->physical_block_size); 2339 sdkp->device->sector_size = sector_size; 2340 } 2341 2342 /* called with buffer of length 512 */ 2343 static inline int 2344 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 2345 unsigned char *buffer, int len, struct scsi_mode_data *data, 2346 struct scsi_sense_hdr *sshdr) 2347 { 2348 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 2349 SD_TIMEOUT, SD_MAX_RETRIES, data, 2350 sshdr); 2351 } 2352 2353 /* 2354 * read write protect setting, if possible - called only in sd_revalidate_disk() 2355 * called with buffer of length SD_BUF_SIZE 2356 */ 2357 static void 2358 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 2359 { 2360 int res; 2361 struct scsi_device *sdp = sdkp->device; 2362 struct scsi_mode_data data; 2363 int old_wp = sdkp->write_prot; 2364 2365 set_disk_ro(sdkp->disk, 0); 2366 if (sdp->skip_ms_page_3f) { 2367 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 2368 return; 2369 } 2370 2371 if (sdp->use_192_bytes_for_3f) { 2372 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 2373 } else { 2374 /* 2375 * First attempt: ask for all pages (0x3F), but only 4 bytes. 2376 * We have to start carefully: some devices hang if we ask 2377 * for more than is available. 2378 */ 2379 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 2380 2381 /* 2382 * Second attempt: ask for page 0 When only page 0 is 2383 * implemented, a request for page 3F may return Sense Key 2384 * 5: Illegal Request, Sense Code 24: Invalid field in 2385 * CDB. 2386 */ 2387 if (!scsi_status_is_good(res)) 2388 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 2389 2390 /* 2391 * Third attempt: ask 255 bytes, as we did earlier. 2392 */ 2393 if (!scsi_status_is_good(res)) 2394 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 2395 &data, NULL); 2396 } 2397 2398 if (!scsi_status_is_good(res)) { 2399 sd_first_printk(KERN_WARNING, sdkp, 2400 "Test WP failed, assume Write Enabled\n"); 2401 } else { 2402 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 2403 set_disk_ro(sdkp->disk, sdkp->write_prot); 2404 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 2405 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 2406 sdkp->write_prot ? "on" : "off"); 2407 sd_printk(KERN_DEBUG, sdkp, 2408 "Mode Sense: %02x %02x %02x %02x\n", 2409 buffer[0], buffer[1], buffer[2], buffer[3]); 2410 } 2411 } 2412 } 2413 2414 /* 2415 * sd_read_cache_type - called only from sd_revalidate_disk() 2416 * called with buffer of length SD_BUF_SIZE 2417 */ 2418 static void 2419 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 2420 { 2421 int len = 0, res; 2422 struct scsi_device *sdp = sdkp->device; 2423 2424 int dbd; 2425 int modepage; 2426 int first_len; 2427 struct scsi_mode_data data; 2428 struct scsi_sense_hdr sshdr; 2429 int old_wce = sdkp->WCE; 2430 int old_rcd = sdkp->RCD; 2431 int old_dpofua = sdkp->DPOFUA; 2432 2433 2434 if (sdkp->cache_override) 2435 return; 2436 2437 first_len = 4; 2438 if (sdp->skip_ms_page_8) { 2439 if (sdp->type == TYPE_RBC) 2440 goto defaults; 2441 else { 2442 if (sdp->skip_ms_page_3f) 2443 goto defaults; 2444 modepage = 0x3F; 2445 if (sdp->use_192_bytes_for_3f) 2446 first_len = 192; 2447 dbd = 0; 2448 } 2449 } else if (sdp->type == TYPE_RBC) { 2450 modepage = 6; 2451 dbd = 8; 2452 } else { 2453 modepage = 8; 2454 dbd = 0; 2455 } 2456 2457 /* cautiously ask */ 2458 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, 2459 &data, &sshdr); 2460 2461 if (!scsi_status_is_good(res)) 2462 goto bad_sense; 2463 2464 if (!data.header_length) { 2465 modepage = 6; 2466 first_len = 0; 2467 sd_first_printk(KERN_ERR, sdkp, 2468 "Missing header in MODE_SENSE response\n"); 2469 } 2470 2471 /* that went OK, now ask for the proper length */ 2472 len = data.length; 2473 2474 /* 2475 * We're only interested in the first three bytes, actually. 2476 * But the data cache page is defined for the first 20. 2477 */ 2478 if (len < 3) 2479 goto bad_sense; 2480 else if (len > SD_BUF_SIZE) { 2481 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " 2482 "data from %d to %d bytes\n", len, SD_BUF_SIZE); 2483 len = SD_BUF_SIZE; 2484 } 2485 if (modepage == 0x3F && sdp->use_192_bytes_for_3f) 2486 len = 192; 2487 2488 /* Get the data */ 2489 if (len > first_len) 2490 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, 2491 &data, &sshdr); 2492 2493 if (scsi_status_is_good(res)) { 2494 int offset = data.header_length + data.block_descriptor_length; 2495 2496 while (offset < len) { 2497 u8 page_code = buffer[offset] & 0x3F; 2498 u8 spf = buffer[offset] & 0x40; 2499 2500 if (page_code == 8 || page_code == 6) { 2501 /* We're interested only in the first 3 bytes. 2502 */ 2503 if (len - offset <= 2) { 2504 sd_first_printk(KERN_ERR, sdkp, 2505 "Incomplete mode parameter " 2506 "data\n"); 2507 goto defaults; 2508 } else { 2509 modepage = page_code; 2510 goto Page_found; 2511 } 2512 } else { 2513 /* Go to the next page */ 2514 if (spf && len - offset > 3) 2515 offset += 4 + (buffer[offset+2] << 8) + 2516 buffer[offset+3]; 2517 else if (!spf && len - offset > 1) 2518 offset += 2 + buffer[offset+1]; 2519 else { 2520 sd_first_printk(KERN_ERR, sdkp, 2521 "Incomplete mode " 2522 "parameter data\n"); 2523 goto defaults; 2524 } 2525 } 2526 } 2527 2528 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n"); 2529 goto defaults; 2530 2531 Page_found: 2532 if (modepage == 8) { 2533 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 2534 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 2535 } else { 2536 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 2537 sdkp->RCD = 0; 2538 } 2539 2540 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 2541 if (sdp->broken_fua) { 2542 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n"); 2543 sdkp->DPOFUA = 0; 2544 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 2545 sd_first_printk(KERN_NOTICE, sdkp, 2546 "Uses READ/WRITE(6), disabling FUA\n"); 2547 sdkp->DPOFUA = 0; 2548 } 2549 2550 /* No cache flush allowed for write protected devices */ 2551 if (sdkp->WCE && sdkp->write_prot) 2552 sdkp->WCE = 0; 2553 2554 if (sdkp->first_scan || old_wce != sdkp->WCE || 2555 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 2556 sd_printk(KERN_NOTICE, sdkp, 2557 "Write cache: %s, read cache: %s, %s\n", 2558 sdkp->WCE ? "enabled" : "disabled", 2559 sdkp->RCD ? "disabled" : "enabled", 2560 sdkp->DPOFUA ? "supports DPO and FUA" 2561 : "doesn't support DPO or FUA"); 2562 2563 return; 2564 } 2565 2566 bad_sense: 2567 if (scsi_sense_valid(&sshdr) && 2568 sshdr.sense_key == ILLEGAL_REQUEST && 2569 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 2570 /* Invalid field in CDB */ 2571 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 2572 else 2573 sd_first_printk(KERN_ERR, sdkp, 2574 "Asking for cache data failed\n"); 2575 2576 defaults: 2577 if (sdp->wce_default_on) { 2578 sd_first_printk(KERN_NOTICE, sdkp, 2579 "Assuming drive cache: write back\n"); 2580 sdkp->WCE = 1; 2581 } else { 2582 sd_first_printk(KERN_ERR, sdkp, 2583 "Assuming drive cache: write through\n"); 2584 sdkp->WCE = 0; 2585 } 2586 sdkp->RCD = 0; 2587 sdkp->DPOFUA = 0; 2588 } 2589 2590 /* 2591 * The ATO bit indicates whether the DIF application tag is available 2592 * for use by the operating system. 2593 */ 2594 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 2595 { 2596 int res, offset; 2597 struct scsi_device *sdp = sdkp->device; 2598 struct scsi_mode_data data; 2599 struct scsi_sense_hdr sshdr; 2600 2601 if (sdp->type != TYPE_DISK) 2602 return; 2603 2604 if (sdkp->protection_type == 0) 2605 return; 2606 2607 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 2608 SD_MAX_RETRIES, &data, &sshdr); 2609 2610 if (!scsi_status_is_good(res) || !data.header_length || 2611 data.length < 6) { 2612 sd_first_printk(KERN_WARNING, sdkp, 2613 "getting Control mode page failed, assume no ATO\n"); 2614 2615 if (scsi_sense_valid(&sshdr)) 2616 sd_print_sense_hdr(sdkp, &sshdr); 2617 2618 return; 2619 } 2620 2621 offset = data.header_length + data.block_descriptor_length; 2622 2623 if ((buffer[offset] & 0x3f) != 0x0a) { 2624 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2625 return; 2626 } 2627 2628 if ((buffer[offset + 5] & 0x80) == 0) 2629 return; 2630 2631 sdkp->ATO = 1; 2632 2633 return; 2634 } 2635 2636 /** 2637 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2638 * @disk: disk to query 2639 */ 2640 static void sd_read_block_limits(struct scsi_disk *sdkp) 2641 { 2642 unsigned int sector_sz = sdkp->device->sector_size; 2643 const int vpd_len = 64; 2644 u32 max_xfer_length; 2645 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2646 2647 if (!buffer || 2648 /* Block Limits VPD */ 2649 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2650 goto out; 2651 2652 max_xfer_length = get_unaligned_be32(&buffer[8]); 2653 if (max_xfer_length) 2654 sdkp->max_xfer_blocks = max_xfer_length; 2655 2656 blk_queue_io_min(sdkp->disk->queue, 2657 get_unaligned_be16(&buffer[6]) * sector_sz); 2658 blk_queue_io_opt(sdkp->disk->queue, 2659 get_unaligned_be32(&buffer[12]) * sector_sz); 2660 2661 if (buffer[3] == 0x3c) { 2662 unsigned int lba_count, desc_count; 2663 2664 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); 2665 2666 if (!sdkp->lbpme) 2667 goto out; 2668 2669 lba_count = get_unaligned_be32(&buffer[20]); 2670 desc_count = get_unaligned_be32(&buffer[24]); 2671 2672 if (lba_count && desc_count) 2673 sdkp->max_unmap_blocks = lba_count; 2674 2675 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); 2676 2677 if (buffer[32] & 0x80) 2678 sdkp->unmap_alignment = 2679 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2680 2681 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ 2682 2683 if (sdkp->max_unmap_blocks) 2684 sd_config_discard(sdkp, SD_LBP_UNMAP); 2685 else 2686 sd_config_discard(sdkp, SD_LBP_WS16); 2687 2688 } else { /* LBP VPD page tells us what to use */ 2689 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz) 2690 sd_config_discard(sdkp, SD_LBP_UNMAP); 2691 else if (sdkp->lbpws) 2692 sd_config_discard(sdkp, SD_LBP_WS16); 2693 else if (sdkp->lbpws10) 2694 sd_config_discard(sdkp, SD_LBP_WS10); 2695 else if (sdkp->lbpu && sdkp->max_unmap_blocks) 2696 sd_config_discard(sdkp, SD_LBP_UNMAP); 2697 else 2698 sd_config_discard(sdkp, SD_LBP_DISABLE); 2699 } 2700 } 2701 2702 out: 2703 kfree(buffer); 2704 } 2705 2706 /** 2707 * sd_read_block_characteristics - Query block dev. characteristics 2708 * @disk: disk to query 2709 */ 2710 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2711 { 2712 unsigned char *buffer; 2713 u16 rot; 2714 const int vpd_len = 64; 2715 2716 buffer = kmalloc(vpd_len, GFP_KERNEL); 2717 2718 if (!buffer || 2719 /* Block Device Characteristics VPD */ 2720 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2721 goto out; 2722 2723 rot = get_unaligned_be16(&buffer[4]); 2724 2725 if (rot == 1) { 2726 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2727 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue); 2728 } 2729 2730 out: 2731 kfree(buffer); 2732 } 2733 2734 /** 2735 * sd_read_block_provisioning - Query provisioning VPD page 2736 * @disk: disk to query 2737 */ 2738 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 2739 { 2740 unsigned char *buffer; 2741 const int vpd_len = 8; 2742 2743 if (sdkp->lbpme == 0) 2744 return; 2745 2746 buffer = kmalloc(vpd_len, GFP_KERNEL); 2747 2748 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) 2749 goto out; 2750 2751 sdkp->lbpvpd = 1; 2752 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ 2753 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ 2754 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ 2755 2756 out: 2757 kfree(buffer); 2758 } 2759 2760 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) 2761 { 2762 struct scsi_device *sdev = sdkp->device; 2763 2764 if (sdev->host->no_write_same) { 2765 sdev->no_write_same = 1; 2766 2767 return; 2768 } 2769 2770 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) { 2771 /* too large values might cause issues with arcmsr */ 2772 int vpd_buf_len = 64; 2773 2774 sdev->no_report_opcodes = 1; 2775 2776 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION 2777 * CODES is unsupported and the device has an ATA 2778 * Information VPD page (SAT). 2779 */ 2780 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len)) 2781 sdev->no_write_same = 1; 2782 } 2783 2784 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1) 2785 sdkp->ws16 = 1; 2786 2787 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1) 2788 sdkp->ws10 = 1; 2789 } 2790 2791 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2792 { 2793 /* Attempt VPD inquiry if the device blacklist explicitly calls 2794 * for it. 2795 */ 2796 if (sdp->try_vpd_pages) 2797 return 1; 2798 /* 2799 * Although VPD inquiries can go to SCSI-2 type devices, 2800 * some USB ones crash on receiving them, and the pages 2801 * we currently ask for are for SPC-3 and beyond 2802 */ 2803 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages) 2804 return 1; 2805 return 0; 2806 } 2807 2808 /** 2809 * sd_revalidate_disk - called the first time a new disk is seen, 2810 * performs disk spin up, read_capacity, etc. 2811 * @disk: struct gendisk we care about 2812 **/ 2813 static int sd_revalidate_disk(struct gendisk *disk) 2814 { 2815 struct scsi_disk *sdkp = scsi_disk(disk); 2816 struct scsi_device *sdp = sdkp->device; 2817 unsigned char *buffer; 2818 unsigned int max_xfer; 2819 2820 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2821 "sd_revalidate_disk\n")); 2822 2823 /* 2824 * If the device is offline, don't try and read capacity or any 2825 * of the other niceties. 2826 */ 2827 if (!scsi_device_online(sdp)) 2828 goto out; 2829 2830 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2831 if (!buffer) { 2832 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2833 "allocation failure.\n"); 2834 goto out; 2835 } 2836 2837 sd_spinup_disk(sdkp); 2838 2839 /* 2840 * Without media there is no reason to ask; moreover, some devices 2841 * react badly if we do. 2842 */ 2843 if (sdkp->media_present) { 2844 sd_read_capacity(sdkp, buffer); 2845 2846 if (sd_try_extended_inquiry(sdp)) { 2847 sd_read_block_provisioning(sdkp); 2848 sd_read_block_limits(sdkp); 2849 sd_read_block_characteristics(sdkp); 2850 } 2851 2852 sd_read_write_protect_flag(sdkp, buffer); 2853 sd_read_cache_type(sdkp, buffer); 2854 sd_read_app_tag_own(sdkp, buffer); 2855 sd_read_write_same(sdkp, buffer); 2856 } 2857 2858 sdkp->first_scan = 0; 2859 2860 /* 2861 * We now have all cache related info, determine how we deal 2862 * with flush requests. 2863 */ 2864 sd_set_flush_flag(sdkp); 2865 2866 max_xfer = sdkp->max_xfer_blocks; 2867 max_xfer <<= ilog2(sdp->sector_size) - 9; 2868 2869 sdkp->disk->queue->limits.max_sectors = 2870 min_not_zero(queue_max_hw_sectors(sdkp->disk->queue), max_xfer); 2871 2872 set_capacity(disk, sdkp->capacity); 2873 sd_config_write_same(sdkp); 2874 kfree(buffer); 2875 2876 out: 2877 return 0; 2878 } 2879 2880 /** 2881 * sd_unlock_native_capacity - unlock native capacity 2882 * @disk: struct gendisk to set capacity for 2883 * 2884 * Block layer calls this function if it detects that partitions 2885 * on @disk reach beyond the end of the device. If the SCSI host 2886 * implements ->unlock_native_capacity() method, it's invoked to 2887 * give it a chance to adjust the device capacity. 2888 * 2889 * CONTEXT: 2890 * Defined by block layer. Might sleep. 2891 */ 2892 static void sd_unlock_native_capacity(struct gendisk *disk) 2893 { 2894 struct scsi_device *sdev = scsi_disk(disk)->device; 2895 2896 if (sdev->host->hostt->unlock_native_capacity) 2897 sdev->host->hostt->unlock_native_capacity(sdev); 2898 } 2899 2900 /** 2901 * sd_format_disk_name - format disk name 2902 * @prefix: name prefix - ie. "sd" for SCSI disks 2903 * @index: index of the disk to format name for 2904 * @buf: output buffer 2905 * @buflen: length of the output buffer 2906 * 2907 * SCSI disk names starts at sda. The 26th device is sdz and the 2908 * 27th is sdaa. The last one for two lettered suffix is sdzz 2909 * which is followed by sdaaa. 2910 * 2911 * This is basically 26 base counting with one extra 'nil' entry 2912 * at the beginning from the second digit on and can be 2913 * determined using similar method as 26 base conversion with the 2914 * index shifted -1 after each digit is computed. 2915 * 2916 * CONTEXT: 2917 * Don't care. 2918 * 2919 * RETURNS: 2920 * 0 on success, -errno on failure. 2921 */ 2922 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2923 { 2924 const int base = 'z' - 'a' + 1; 2925 char *begin = buf + strlen(prefix); 2926 char *end = buf + buflen; 2927 char *p; 2928 int unit; 2929 2930 p = end - 1; 2931 *p = '\0'; 2932 unit = base; 2933 do { 2934 if (p == begin) 2935 return -EINVAL; 2936 *--p = 'a' + (index % unit); 2937 index = (index / unit) - 1; 2938 } while (index >= 0); 2939 2940 memmove(begin, p, end - p); 2941 memcpy(buf, prefix, strlen(prefix)); 2942 2943 return 0; 2944 } 2945 2946 /* 2947 * The asynchronous part of sd_probe 2948 */ 2949 static void sd_probe_async(void *data, async_cookie_t cookie) 2950 { 2951 struct scsi_disk *sdkp = data; 2952 struct scsi_device *sdp; 2953 struct gendisk *gd; 2954 u32 index; 2955 struct device *dev; 2956 2957 sdp = sdkp->device; 2958 gd = sdkp->disk; 2959 index = sdkp->index; 2960 dev = &sdp->sdev_gendev; 2961 2962 gd->major = sd_major((index & 0xf0) >> 4); 2963 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2964 gd->minors = SD_MINORS; 2965 2966 gd->fops = &sd_fops; 2967 gd->private_data = &sdkp->driver; 2968 gd->queue = sdkp->device->request_queue; 2969 2970 /* defaults, until the device tells us otherwise */ 2971 sdp->sector_size = 512; 2972 sdkp->capacity = 0; 2973 sdkp->media_present = 1; 2974 sdkp->write_prot = 0; 2975 sdkp->cache_override = 0; 2976 sdkp->WCE = 0; 2977 sdkp->RCD = 0; 2978 sdkp->ATO = 0; 2979 sdkp->first_scan = 1; 2980 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; 2981 2982 sd_revalidate_disk(gd); 2983 2984 gd->driverfs_dev = &sdp->sdev_gendev; 2985 gd->flags = GENHD_FL_EXT_DEVT; 2986 if (sdp->removable) { 2987 gd->flags |= GENHD_FL_REMOVABLE; 2988 gd->events |= DISK_EVENT_MEDIA_CHANGE; 2989 } 2990 2991 blk_pm_runtime_init(sdp->request_queue, dev); 2992 add_disk(gd); 2993 if (sdkp->capacity) 2994 sd_dif_config_host(sdkp); 2995 2996 sd_revalidate_disk(gd); 2997 2998 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2999 sdp->removable ? "removable " : ""); 3000 scsi_autopm_put_device(sdp); 3001 put_device(&sdkp->dev); 3002 } 3003 3004 /** 3005 * sd_probe - called during driver initialization and whenever a 3006 * new scsi device is attached to the system. It is called once 3007 * for each scsi device (not just disks) present. 3008 * @dev: pointer to device object 3009 * 3010 * Returns 0 if successful (or not interested in this scsi device 3011 * (e.g. scanner)); 1 when there is an error. 3012 * 3013 * Note: this function is invoked from the scsi mid-level. 3014 * This function sets up the mapping between a given 3015 * <host,channel,id,lun> (found in sdp) and new device name 3016 * (e.g. /dev/sda). More precisely it is the block device major 3017 * and minor number that is chosen here. 3018 * 3019 * Assume sd_probe is not re-entrant (for time being) 3020 * Also think about sd_probe() and sd_remove() running coincidentally. 3021 **/ 3022 static int sd_probe(struct device *dev) 3023 { 3024 struct scsi_device *sdp = to_scsi_device(dev); 3025 struct scsi_disk *sdkp; 3026 struct gendisk *gd; 3027 int index; 3028 int error; 3029 3030 scsi_autopm_get_device(sdp); 3031 error = -ENODEV; 3032 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 3033 goto out; 3034 3035 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 3036 "sd_probe\n")); 3037 3038 error = -ENOMEM; 3039 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 3040 if (!sdkp) 3041 goto out; 3042 3043 gd = alloc_disk(SD_MINORS); 3044 if (!gd) 3045 goto out_free; 3046 3047 do { 3048 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 3049 goto out_put; 3050 3051 spin_lock(&sd_index_lock); 3052 error = ida_get_new(&sd_index_ida, &index); 3053 spin_unlock(&sd_index_lock); 3054 } while (error == -EAGAIN); 3055 3056 if (error) { 3057 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); 3058 goto out_put; 3059 } 3060 3061 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 3062 if (error) { 3063 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); 3064 goto out_free_index; 3065 } 3066 3067 sdkp->device = sdp; 3068 sdkp->driver = &sd_template; 3069 sdkp->disk = gd; 3070 sdkp->index = index; 3071 atomic_set(&sdkp->openers, 0); 3072 atomic_set(&sdkp->device->ioerr_cnt, 0); 3073 3074 if (!sdp->request_queue->rq_timeout) { 3075 if (sdp->type != TYPE_MOD) 3076 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 3077 else 3078 blk_queue_rq_timeout(sdp->request_queue, 3079 SD_MOD_TIMEOUT); 3080 } 3081 3082 device_initialize(&sdkp->dev); 3083 sdkp->dev.parent = dev; 3084 sdkp->dev.class = &sd_disk_class; 3085 dev_set_name(&sdkp->dev, "%s", dev_name(dev)); 3086 3087 error = device_add(&sdkp->dev); 3088 if (error) 3089 goto out_free_index; 3090 3091 get_device(dev); 3092 dev_set_drvdata(dev, sdkp); 3093 3094 get_device(&sdkp->dev); /* prevent release before async_schedule */ 3095 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain); 3096 3097 return 0; 3098 3099 out_free_index: 3100 spin_lock(&sd_index_lock); 3101 ida_remove(&sd_index_ida, index); 3102 spin_unlock(&sd_index_lock); 3103 out_put: 3104 put_disk(gd); 3105 out_free: 3106 kfree(sdkp); 3107 out: 3108 scsi_autopm_put_device(sdp); 3109 return error; 3110 } 3111 3112 /** 3113 * sd_remove - called whenever a scsi disk (previously recognized by 3114 * sd_probe) is detached from the system. It is called (potentially 3115 * multiple times) during sd module unload. 3116 * @sdp: pointer to mid level scsi device object 3117 * 3118 * Note: this function is invoked from the scsi mid-level. 3119 * This function potentially frees up a device name (e.g. /dev/sdc) 3120 * that could be re-used by a subsequent sd_probe(). 3121 * This function is not called when the built-in sd driver is "exit-ed". 3122 **/ 3123 static int sd_remove(struct device *dev) 3124 { 3125 struct scsi_disk *sdkp; 3126 dev_t devt; 3127 3128 sdkp = dev_get_drvdata(dev); 3129 devt = disk_devt(sdkp->disk); 3130 scsi_autopm_get_device(sdkp->device); 3131 3132 async_synchronize_full_domain(&scsi_sd_pm_domain); 3133 async_synchronize_full_domain(&scsi_sd_probe_domain); 3134 device_del(&sdkp->dev); 3135 del_gendisk(sdkp->disk); 3136 sd_shutdown(dev); 3137 3138 blk_register_region(devt, SD_MINORS, NULL, 3139 sd_default_probe, NULL, NULL); 3140 3141 mutex_lock(&sd_ref_mutex); 3142 dev_set_drvdata(dev, NULL); 3143 put_device(&sdkp->dev); 3144 mutex_unlock(&sd_ref_mutex); 3145 3146 return 0; 3147 } 3148 3149 /** 3150 * scsi_disk_release - Called to free the scsi_disk structure 3151 * @dev: pointer to embedded class device 3152 * 3153 * sd_ref_mutex must be held entering this routine. Because it is 3154 * called on last put, you should always use the scsi_disk_get() 3155 * scsi_disk_put() helpers which manipulate the semaphore directly 3156 * and never do a direct put_device. 3157 **/ 3158 static void scsi_disk_release(struct device *dev) 3159 { 3160 struct scsi_disk *sdkp = to_scsi_disk(dev); 3161 struct gendisk *disk = sdkp->disk; 3162 3163 spin_lock(&sd_index_lock); 3164 ida_remove(&sd_index_ida, sdkp->index); 3165 spin_unlock(&sd_index_lock); 3166 3167 disk->private_data = NULL; 3168 put_disk(disk); 3169 put_device(&sdkp->device->sdev_gendev); 3170 3171 kfree(sdkp); 3172 } 3173 3174 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 3175 { 3176 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 3177 struct scsi_sense_hdr sshdr; 3178 struct scsi_device *sdp = sdkp->device; 3179 int res; 3180 3181 if (start) 3182 cmd[4] |= 1; /* START */ 3183 3184 if (sdp->start_stop_pwr_cond) 3185 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 3186 3187 if (!scsi_device_online(sdp)) 3188 return -ENODEV; 3189 3190 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 3191 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM); 3192 if (res) { 3193 sd_print_result(sdkp, "Start/Stop Unit failed", res); 3194 if (driver_byte(res) & DRIVER_SENSE) 3195 sd_print_sense_hdr(sdkp, &sshdr); 3196 if (scsi_sense_valid(&sshdr) && 3197 /* 0x3a is medium not present */ 3198 sshdr.asc == 0x3a) 3199 res = 0; 3200 } 3201 3202 /* SCSI error codes must not go to the generic layer */ 3203 if (res) 3204 return -EIO; 3205 3206 return 0; 3207 } 3208 3209 /* 3210 * Send a SYNCHRONIZE CACHE instruction down to the device through 3211 * the normal SCSI command structure. Wait for the command to 3212 * complete. 3213 */ 3214 static void sd_shutdown(struct device *dev) 3215 { 3216 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3217 3218 if (!sdkp) 3219 return; /* this can happen */ 3220 3221 if (pm_runtime_suspended(dev)) 3222 return; 3223 3224 if (sdkp->WCE && sdkp->media_present) { 3225 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3226 sd_sync_cache(sdkp); 3227 } 3228 3229 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 3230 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3231 sd_start_stop_device(sdkp, 0); 3232 } 3233 } 3234 3235 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors) 3236 { 3237 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3238 int ret = 0; 3239 3240 if (!sdkp) 3241 return 0; /* this can happen */ 3242 3243 if (sdkp->WCE && sdkp->media_present) { 3244 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3245 ret = sd_sync_cache(sdkp); 3246 if (ret) { 3247 /* ignore OFFLINE device */ 3248 if (ret == -ENODEV) 3249 ret = 0; 3250 goto done; 3251 } 3252 } 3253 3254 if (sdkp->device->manage_start_stop) { 3255 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3256 /* an error is not worth aborting a system sleep */ 3257 ret = sd_start_stop_device(sdkp, 0); 3258 if (ignore_stop_errors) 3259 ret = 0; 3260 } 3261 3262 done: 3263 return ret; 3264 } 3265 3266 static int sd_suspend_system(struct device *dev) 3267 { 3268 return sd_suspend_common(dev, true); 3269 } 3270 3271 static int sd_suspend_runtime(struct device *dev) 3272 { 3273 return sd_suspend_common(dev, false); 3274 } 3275 3276 static int sd_resume(struct device *dev) 3277 { 3278 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3279 3280 if (!sdkp->device->manage_start_stop) 3281 return 0; 3282 3283 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 3284 return sd_start_stop_device(sdkp, 1); 3285 } 3286 3287 /** 3288 * init_sd - entry point for this driver (both when built in or when 3289 * a module). 3290 * 3291 * Note: this function registers this driver with the scsi mid-level. 3292 **/ 3293 static int __init init_sd(void) 3294 { 3295 int majors = 0, i, err; 3296 3297 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 3298 3299 for (i = 0; i < SD_MAJORS; i++) { 3300 if (register_blkdev(sd_major(i), "sd") != 0) 3301 continue; 3302 majors++; 3303 blk_register_region(sd_major(i), SD_MINORS, NULL, 3304 sd_default_probe, NULL, NULL); 3305 } 3306 3307 if (!majors) 3308 return -ENODEV; 3309 3310 err = class_register(&sd_disk_class); 3311 if (err) 3312 goto err_out; 3313 3314 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 3315 0, 0, NULL); 3316 if (!sd_cdb_cache) { 3317 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 3318 err = -ENOMEM; 3319 goto err_out_class; 3320 } 3321 3322 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 3323 if (!sd_cdb_pool) { 3324 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 3325 err = -ENOMEM; 3326 goto err_out_cache; 3327 } 3328 3329 err = scsi_register_driver(&sd_template.gendrv); 3330 if (err) 3331 goto err_out_driver; 3332 3333 return 0; 3334 3335 err_out_driver: 3336 mempool_destroy(sd_cdb_pool); 3337 3338 err_out_cache: 3339 kmem_cache_destroy(sd_cdb_cache); 3340 3341 err_out_class: 3342 class_unregister(&sd_disk_class); 3343 err_out: 3344 for (i = 0; i < SD_MAJORS; i++) 3345 unregister_blkdev(sd_major(i), "sd"); 3346 return err; 3347 } 3348 3349 /** 3350 * exit_sd - exit point for this driver (when it is a module). 3351 * 3352 * Note: this function unregisters this driver from the scsi mid-level. 3353 **/ 3354 static void __exit exit_sd(void) 3355 { 3356 int i; 3357 3358 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 3359 3360 scsi_unregister_driver(&sd_template.gendrv); 3361 mempool_destroy(sd_cdb_pool); 3362 kmem_cache_destroy(sd_cdb_cache); 3363 3364 class_unregister(&sd_disk_class); 3365 3366 for (i = 0; i < SD_MAJORS; i++) { 3367 blk_unregister_region(sd_major(i), SD_MINORS); 3368 unregister_blkdev(sd_major(i), "sd"); 3369 } 3370 } 3371 3372 module_init(init_sd); 3373 module_exit(exit_sd); 3374 3375 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 3376 struct scsi_sense_hdr *sshdr) 3377 { 3378 scsi_print_sense_hdr(sdkp->device, 3379 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr); 3380 } 3381 3382 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg, 3383 int result) 3384 { 3385 const char *hb_string = scsi_hostbyte_string(result); 3386 const char *db_string = scsi_driverbyte_string(result); 3387 3388 if (hb_string || db_string) 3389 sd_printk(KERN_INFO, sdkp, 3390 "%s: Result: hostbyte=%s driverbyte=%s\n", msg, 3391 hb_string ? hb_string : "invalid", 3392 db_string ? db_string : "invalid"); 3393 else 3394 sd_printk(KERN_INFO, sdkp, 3395 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n", 3396 msg, host_byte(result), driver_byte(result)); 3397 } 3398 3399