1 /* 2 * sd.c Copyright (C) 1992 Drew Eckhardt 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * Linux scsi disk driver 6 * Initial versions: Drew Eckhardt 7 * Subsequent revisions: Eric Youngdale 8 * Modification history: 9 * - Drew Eckhardt <drew@colorado.edu> original 10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 11 * outstanding request, and other enhancements. 12 * Support loadable low-level scsi drivers. 13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 14 * eight major numbers. 15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. 16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 17 * sd_init and cleanups. 18 * - Alex Davis <letmein@erols.com> Fix problem where partition info 19 * not being read in sd_open. Fix problem where removable media 20 * could be ejected after sd_open. 21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x 22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 24 * Support 32k/1M disks. 25 * 26 * Logging policy (needs CONFIG_SCSI_LOGGING defined): 27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 30 * - entering other commands: SCSI_LOG_HLQUEUE level 3 31 * Note: when the logging level is set by the user, it must be greater 32 * than the level indicated above to trigger output. 33 */ 34 35 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/genhd.h> 41 #include <linux/hdreg.h> 42 #include <linux/errno.h> 43 #include <linux/idr.h> 44 #include <linux/interrupt.h> 45 #include <linux/init.h> 46 #include <linux/blkdev.h> 47 #include <linux/blkpg.h> 48 #include <linux/delay.h> 49 #include <linux/mutex.h> 50 #include <linux/string_helpers.h> 51 #include <linux/async.h> 52 #include <linux/slab.h> 53 #include <linux/pm_runtime.h> 54 #include <asm/uaccess.h> 55 #include <asm/unaligned.h> 56 57 #include <scsi/scsi.h> 58 #include <scsi/scsi_cmnd.h> 59 #include <scsi/scsi_dbg.h> 60 #include <scsi/scsi_device.h> 61 #include <scsi/scsi_driver.h> 62 #include <scsi/scsi_eh.h> 63 #include <scsi/scsi_host.h> 64 #include <scsi/scsi_ioctl.h> 65 #include <scsi/scsicam.h> 66 67 #include "sd.h" 68 #include "scsi_priv.h" 69 #include "scsi_logging.h" 70 71 MODULE_AUTHOR("Eric Youngdale"); 72 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 73 MODULE_LICENSE("GPL"); 74 75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 94 95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 96 #define SD_MINORS 16 97 #else 98 #define SD_MINORS 0 99 #endif 100 101 static void sd_config_discard(struct scsi_disk *, unsigned int); 102 static void sd_config_write_same(struct scsi_disk *); 103 static int sd_revalidate_disk(struct gendisk *); 104 static void sd_unlock_native_capacity(struct gendisk *disk); 105 static int sd_probe(struct device *); 106 static int sd_remove(struct device *); 107 static void sd_shutdown(struct device *); 108 static int sd_suspend_system(struct device *); 109 static int sd_suspend_runtime(struct device *); 110 static int sd_resume(struct device *); 111 static void sd_rescan(struct device *); 112 static int sd_init_command(struct scsi_cmnd *SCpnt); 113 static void sd_uninit_command(struct scsi_cmnd *SCpnt); 114 static int sd_done(struct scsi_cmnd *); 115 static int sd_eh_action(struct scsi_cmnd *, int); 116 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 117 static void scsi_disk_release(struct device *cdev); 118 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 119 static void sd_print_result(const struct scsi_disk *, const char *, int); 120 121 static DEFINE_SPINLOCK(sd_index_lock); 122 static DEFINE_IDA(sd_index_ida); 123 124 /* This semaphore is used to mediate the 0->1 reference get in the 125 * face of object destruction (i.e. we can't allow a get on an 126 * object after last put) */ 127 static DEFINE_MUTEX(sd_ref_mutex); 128 129 static struct kmem_cache *sd_cdb_cache; 130 static mempool_t *sd_cdb_pool; 131 132 static const char *sd_cache_types[] = { 133 "write through", "none", "write back", 134 "write back, no read (daft)" 135 }; 136 137 static void sd_set_flush_flag(struct scsi_disk *sdkp) 138 { 139 unsigned flush = 0; 140 141 if (sdkp->WCE) { 142 flush |= REQ_FLUSH; 143 if (sdkp->DPOFUA) 144 flush |= REQ_FUA; 145 } 146 147 blk_queue_flush(sdkp->disk->queue, flush); 148 } 149 150 static ssize_t 151 cache_type_store(struct device *dev, struct device_attribute *attr, 152 const char *buf, size_t count) 153 { 154 int i, ct = -1, rcd, wce, sp; 155 struct scsi_disk *sdkp = to_scsi_disk(dev); 156 struct scsi_device *sdp = sdkp->device; 157 char buffer[64]; 158 char *buffer_data; 159 struct scsi_mode_data data; 160 struct scsi_sense_hdr sshdr; 161 static const char temp[] = "temporary "; 162 int len; 163 164 if (sdp->type != TYPE_DISK) 165 /* no cache control on RBC devices; theoretically they 166 * can do it, but there's probably so many exceptions 167 * it's not worth the risk */ 168 return -EINVAL; 169 170 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) { 171 buf += sizeof(temp) - 1; 172 sdkp->cache_override = 1; 173 } else { 174 sdkp->cache_override = 0; 175 } 176 177 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 178 len = strlen(sd_cache_types[i]); 179 if (strncmp(sd_cache_types[i], buf, len) == 0 && 180 buf[len] == '\n') { 181 ct = i; 182 break; 183 } 184 } 185 if (ct < 0) 186 return -EINVAL; 187 rcd = ct & 0x01 ? 1 : 0; 188 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0; 189 190 if (sdkp->cache_override) { 191 sdkp->WCE = wce; 192 sdkp->RCD = rcd; 193 sd_set_flush_flag(sdkp); 194 return count; 195 } 196 197 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 198 SD_MAX_RETRIES, &data, NULL)) 199 return -EINVAL; 200 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 201 data.block_descriptor_length); 202 buffer_data = buffer + data.header_length + 203 data.block_descriptor_length; 204 buffer_data[2] &= ~0x05; 205 buffer_data[2] |= wce << 2 | rcd; 206 sp = buffer_data[0] & 0x80 ? 1 : 0; 207 208 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 209 SD_MAX_RETRIES, &data, &sshdr)) { 210 if (scsi_sense_valid(&sshdr)) 211 sd_print_sense_hdr(sdkp, &sshdr); 212 return -EINVAL; 213 } 214 revalidate_disk(sdkp->disk); 215 return count; 216 } 217 218 static ssize_t 219 manage_start_stop_show(struct device *dev, struct device_attribute *attr, 220 char *buf) 221 { 222 struct scsi_disk *sdkp = to_scsi_disk(dev); 223 struct scsi_device *sdp = sdkp->device; 224 225 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 226 } 227 228 static ssize_t 229 manage_start_stop_store(struct device *dev, struct device_attribute *attr, 230 const char *buf, size_t count) 231 { 232 struct scsi_disk *sdkp = to_scsi_disk(dev); 233 struct scsi_device *sdp = sdkp->device; 234 235 if (!capable(CAP_SYS_ADMIN)) 236 return -EACCES; 237 238 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 239 240 return count; 241 } 242 static DEVICE_ATTR_RW(manage_start_stop); 243 244 static ssize_t 245 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf) 246 { 247 struct scsi_disk *sdkp = to_scsi_disk(dev); 248 249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 250 } 251 252 static ssize_t 253 allow_restart_store(struct device *dev, struct device_attribute *attr, 254 const char *buf, size_t count) 255 { 256 struct scsi_disk *sdkp = to_scsi_disk(dev); 257 struct scsi_device *sdp = sdkp->device; 258 259 if (!capable(CAP_SYS_ADMIN)) 260 return -EACCES; 261 262 if (sdp->type != TYPE_DISK) 263 return -EINVAL; 264 265 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 266 267 return count; 268 } 269 static DEVICE_ATTR_RW(allow_restart); 270 271 static ssize_t 272 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf) 273 { 274 struct scsi_disk *sdkp = to_scsi_disk(dev); 275 int ct = sdkp->RCD + 2*sdkp->WCE; 276 277 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 278 } 279 static DEVICE_ATTR_RW(cache_type); 280 281 static ssize_t 282 FUA_show(struct device *dev, struct device_attribute *attr, char *buf) 283 { 284 struct scsi_disk *sdkp = to_scsi_disk(dev); 285 286 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 287 } 288 static DEVICE_ATTR_RO(FUA); 289 290 static ssize_t 291 protection_type_show(struct device *dev, struct device_attribute *attr, 292 char *buf) 293 { 294 struct scsi_disk *sdkp = to_scsi_disk(dev); 295 296 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 297 } 298 299 static ssize_t 300 protection_type_store(struct device *dev, struct device_attribute *attr, 301 const char *buf, size_t count) 302 { 303 struct scsi_disk *sdkp = to_scsi_disk(dev); 304 unsigned int val; 305 int err; 306 307 if (!capable(CAP_SYS_ADMIN)) 308 return -EACCES; 309 310 err = kstrtouint(buf, 10, &val); 311 312 if (err) 313 return err; 314 315 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION) 316 sdkp->protection_type = val; 317 318 return count; 319 } 320 static DEVICE_ATTR_RW(protection_type); 321 322 static ssize_t 323 protection_mode_show(struct device *dev, struct device_attribute *attr, 324 char *buf) 325 { 326 struct scsi_disk *sdkp = to_scsi_disk(dev); 327 struct scsi_device *sdp = sdkp->device; 328 unsigned int dif, dix; 329 330 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 331 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); 332 333 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) { 334 dif = 0; 335 dix = 1; 336 } 337 338 if (!dif && !dix) 339 return snprintf(buf, 20, "none\n"); 340 341 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif); 342 } 343 static DEVICE_ATTR_RO(protection_mode); 344 345 static ssize_t 346 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf) 347 { 348 struct scsi_disk *sdkp = to_scsi_disk(dev); 349 350 return snprintf(buf, 20, "%u\n", sdkp->ATO); 351 } 352 static DEVICE_ATTR_RO(app_tag_own); 353 354 static ssize_t 355 thin_provisioning_show(struct device *dev, struct device_attribute *attr, 356 char *buf) 357 { 358 struct scsi_disk *sdkp = to_scsi_disk(dev); 359 360 return snprintf(buf, 20, "%u\n", sdkp->lbpme); 361 } 362 static DEVICE_ATTR_RO(thin_provisioning); 363 364 static const char *lbp_mode[] = { 365 [SD_LBP_FULL] = "full", 366 [SD_LBP_UNMAP] = "unmap", 367 [SD_LBP_WS16] = "writesame_16", 368 [SD_LBP_WS10] = "writesame_10", 369 [SD_LBP_ZERO] = "writesame_zero", 370 [SD_LBP_DISABLE] = "disabled", 371 }; 372 373 static ssize_t 374 provisioning_mode_show(struct device *dev, struct device_attribute *attr, 375 char *buf) 376 { 377 struct scsi_disk *sdkp = to_scsi_disk(dev); 378 379 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]); 380 } 381 382 static ssize_t 383 provisioning_mode_store(struct device *dev, struct device_attribute *attr, 384 const char *buf, size_t count) 385 { 386 struct scsi_disk *sdkp = to_scsi_disk(dev); 387 struct scsi_device *sdp = sdkp->device; 388 389 if (!capable(CAP_SYS_ADMIN)) 390 return -EACCES; 391 392 if (sdp->type != TYPE_DISK) 393 return -EINVAL; 394 395 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20)) 396 sd_config_discard(sdkp, SD_LBP_UNMAP); 397 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20)) 398 sd_config_discard(sdkp, SD_LBP_WS16); 399 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20)) 400 sd_config_discard(sdkp, SD_LBP_WS10); 401 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20)) 402 sd_config_discard(sdkp, SD_LBP_ZERO); 403 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20)) 404 sd_config_discard(sdkp, SD_LBP_DISABLE); 405 else 406 return -EINVAL; 407 408 return count; 409 } 410 static DEVICE_ATTR_RW(provisioning_mode); 411 412 static ssize_t 413 max_medium_access_timeouts_show(struct device *dev, 414 struct device_attribute *attr, char *buf) 415 { 416 struct scsi_disk *sdkp = to_scsi_disk(dev); 417 418 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts); 419 } 420 421 static ssize_t 422 max_medium_access_timeouts_store(struct device *dev, 423 struct device_attribute *attr, const char *buf, 424 size_t count) 425 { 426 struct scsi_disk *sdkp = to_scsi_disk(dev); 427 int err; 428 429 if (!capable(CAP_SYS_ADMIN)) 430 return -EACCES; 431 432 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); 433 434 return err ? err : count; 435 } 436 static DEVICE_ATTR_RW(max_medium_access_timeouts); 437 438 static ssize_t 439 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr, 440 char *buf) 441 { 442 struct scsi_disk *sdkp = to_scsi_disk(dev); 443 444 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks); 445 } 446 447 static ssize_t 448 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr, 449 const char *buf, size_t count) 450 { 451 struct scsi_disk *sdkp = to_scsi_disk(dev); 452 struct scsi_device *sdp = sdkp->device; 453 unsigned long max; 454 int err; 455 456 if (!capable(CAP_SYS_ADMIN)) 457 return -EACCES; 458 459 if (sdp->type != TYPE_DISK) 460 return -EINVAL; 461 462 err = kstrtoul(buf, 10, &max); 463 464 if (err) 465 return err; 466 467 if (max == 0) 468 sdp->no_write_same = 1; 469 else if (max <= SD_MAX_WS16_BLOCKS) { 470 sdp->no_write_same = 0; 471 sdkp->max_ws_blocks = max; 472 } 473 474 sd_config_write_same(sdkp); 475 476 return count; 477 } 478 static DEVICE_ATTR_RW(max_write_same_blocks); 479 480 static struct attribute *sd_disk_attrs[] = { 481 &dev_attr_cache_type.attr, 482 &dev_attr_FUA.attr, 483 &dev_attr_allow_restart.attr, 484 &dev_attr_manage_start_stop.attr, 485 &dev_attr_protection_type.attr, 486 &dev_attr_protection_mode.attr, 487 &dev_attr_app_tag_own.attr, 488 &dev_attr_thin_provisioning.attr, 489 &dev_attr_provisioning_mode.attr, 490 &dev_attr_max_write_same_blocks.attr, 491 &dev_attr_max_medium_access_timeouts.attr, 492 NULL, 493 }; 494 ATTRIBUTE_GROUPS(sd_disk); 495 496 static struct class sd_disk_class = { 497 .name = "scsi_disk", 498 .owner = THIS_MODULE, 499 .dev_release = scsi_disk_release, 500 .dev_groups = sd_disk_groups, 501 }; 502 503 static const struct dev_pm_ops sd_pm_ops = { 504 .suspend = sd_suspend_system, 505 .resume = sd_resume, 506 .poweroff = sd_suspend_system, 507 .restore = sd_resume, 508 .runtime_suspend = sd_suspend_runtime, 509 .runtime_resume = sd_resume, 510 }; 511 512 static struct scsi_driver sd_template = { 513 .gendrv = { 514 .name = "sd", 515 .owner = THIS_MODULE, 516 .probe = sd_probe, 517 .remove = sd_remove, 518 .shutdown = sd_shutdown, 519 .pm = &sd_pm_ops, 520 }, 521 .rescan = sd_rescan, 522 .init_command = sd_init_command, 523 .uninit_command = sd_uninit_command, 524 .done = sd_done, 525 .eh_action = sd_eh_action, 526 }; 527 528 /* 529 * Dummy kobj_map->probe function. 530 * The default ->probe function will call modprobe, which is 531 * pointless as this module is already loaded. 532 */ 533 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data) 534 { 535 return NULL; 536 } 537 538 /* 539 * Device no to disk mapping: 540 * 541 * major disc2 disc p1 542 * |............|.............|....|....| <- dev_t 543 * 31 20 19 8 7 4 3 0 544 * 545 * Inside a major, we have 16k disks, however mapped non- 546 * contiguously. The first 16 disks are for major0, the next 547 * ones with major1, ... Disk 256 is for major0 again, disk 272 548 * for major1, ... 549 * As we stay compatible with our numbering scheme, we can reuse 550 * the well-know SCSI majors 8, 65--71, 136--143. 551 */ 552 static int sd_major(int major_idx) 553 { 554 switch (major_idx) { 555 case 0: 556 return SCSI_DISK0_MAJOR; 557 case 1 ... 7: 558 return SCSI_DISK1_MAJOR + major_idx - 1; 559 case 8 ... 15: 560 return SCSI_DISK8_MAJOR + major_idx - 8; 561 default: 562 BUG(); 563 return 0; /* shut up gcc */ 564 } 565 } 566 567 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 568 { 569 struct scsi_disk *sdkp = NULL; 570 571 mutex_lock(&sd_ref_mutex); 572 573 if (disk->private_data) { 574 sdkp = scsi_disk(disk); 575 if (scsi_device_get(sdkp->device) == 0) 576 get_device(&sdkp->dev); 577 else 578 sdkp = NULL; 579 } 580 mutex_unlock(&sd_ref_mutex); 581 return sdkp; 582 } 583 584 static void scsi_disk_put(struct scsi_disk *sdkp) 585 { 586 struct scsi_device *sdev = sdkp->device; 587 588 mutex_lock(&sd_ref_mutex); 589 put_device(&sdkp->dev); 590 scsi_device_put(sdev); 591 mutex_unlock(&sd_ref_mutex); 592 } 593 594 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd, 595 unsigned int dix, unsigned int dif) 596 { 597 struct bio *bio = scmd->request->bio; 598 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif); 599 unsigned int protect = 0; 600 601 if (dix) { /* DIX Type 0, 1, 2, 3 */ 602 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM)) 603 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM; 604 605 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 606 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK; 607 } 608 609 if (dif != SD_DIF_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */ 610 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT; 611 612 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false) 613 scmd->prot_flags |= SCSI_PROT_REF_CHECK; 614 } 615 616 if (dif) { /* DIX/DIF Type 1, 2, 3 */ 617 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI; 618 619 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK)) 620 protect = 3 << 5; /* Disable target PI checking */ 621 else 622 protect = 1 << 5; /* Enable target PI checking */ 623 } 624 625 scsi_set_prot_op(scmd, prot_op); 626 scsi_set_prot_type(scmd, dif); 627 scmd->prot_flags &= sd_prot_flag_mask(prot_op); 628 629 return protect; 630 } 631 632 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) 633 { 634 struct request_queue *q = sdkp->disk->queue; 635 unsigned int logical_block_size = sdkp->device->sector_size; 636 unsigned int max_blocks = 0; 637 638 q->limits.discard_zeroes_data = 0; 639 q->limits.discard_alignment = sdkp->unmap_alignment * 640 logical_block_size; 641 q->limits.discard_granularity = 642 max(sdkp->physical_block_size, 643 sdkp->unmap_granularity * logical_block_size); 644 645 sdkp->provisioning_mode = mode; 646 647 switch (mode) { 648 649 case SD_LBP_DISABLE: 650 q->limits.max_discard_sectors = 0; 651 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); 652 return; 653 654 case SD_LBP_UNMAP: 655 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 656 (u32)SD_MAX_WS16_BLOCKS); 657 break; 658 659 case SD_LBP_WS16: 660 max_blocks = min_not_zero(sdkp->max_ws_blocks, 661 (u32)SD_MAX_WS16_BLOCKS); 662 q->limits.discard_zeroes_data = sdkp->lbprz; 663 break; 664 665 case SD_LBP_WS10: 666 max_blocks = min_not_zero(sdkp->max_ws_blocks, 667 (u32)SD_MAX_WS10_BLOCKS); 668 q->limits.discard_zeroes_data = sdkp->lbprz; 669 break; 670 671 case SD_LBP_ZERO: 672 max_blocks = min_not_zero(sdkp->max_ws_blocks, 673 (u32)SD_MAX_WS10_BLOCKS); 674 q->limits.discard_zeroes_data = 1; 675 break; 676 } 677 678 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9); 679 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 680 } 681 682 /** 683 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device 684 * @sdp: scsi device to operate one 685 * @rq: Request to prepare 686 * 687 * Will issue either UNMAP or WRITE SAME(16) depending on preference 688 * indicated by target device. 689 **/ 690 static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd) 691 { 692 struct request *rq = cmd->request; 693 struct scsi_device *sdp = cmd->device; 694 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 695 sector_t sector = blk_rq_pos(rq); 696 unsigned int nr_sectors = blk_rq_sectors(rq); 697 unsigned int nr_bytes = blk_rq_bytes(rq); 698 unsigned int len; 699 int ret; 700 char *buf; 701 struct page *page; 702 703 sector >>= ilog2(sdp->sector_size) - 9; 704 nr_sectors >>= ilog2(sdp->sector_size) - 9; 705 706 page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 707 if (!page) 708 return BLKPREP_DEFER; 709 710 switch (sdkp->provisioning_mode) { 711 case SD_LBP_UNMAP: 712 buf = page_address(page); 713 714 cmd->cmd_len = 10; 715 cmd->cmnd[0] = UNMAP; 716 cmd->cmnd[8] = 24; 717 718 put_unaligned_be16(6 + 16, &buf[0]); 719 put_unaligned_be16(16, &buf[2]); 720 put_unaligned_be64(sector, &buf[8]); 721 put_unaligned_be32(nr_sectors, &buf[16]); 722 723 len = 24; 724 break; 725 726 case SD_LBP_WS16: 727 cmd->cmd_len = 16; 728 cmd->cmnd[0] = WRITE_SAME_16; 729 cmd->cmnd[1] = 0x8; /* UNMAP */ 730 put_unaligned_be64(sector, &cmd->cmnd[2]); 731 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); 732 733 len = sdkp->device->sector_size; 734 break; 735 736 case SD_LBP_WS10: 737 case SD_LBP_ZERO: 738 cmd->cmd_len = 10; 739 cmd->cmnd[0] = WRITE_SAME; 740 if (sdkp->provisioning_mode == SD_LBP_WS10) 741 cmd->cmnd[1] = 0x8; /* UNMAP */ 742 put_unaligned_be32(sector, &cmd->cmnd[2]); 743 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); 744 745 len = sdkp->device->sector_size; 746 break; 747 748 default: 749 ret = BLKPREP_KILL; 750 goto out; 751 } 752 753 rq->completion_data = page; 754 rq->timeout = SD_TIMEOUT; 755 756 cmd->transfersize = len; 757 cmd->allowed = SD_MAX_RETRIES; 758 759 /* 760 * Initially __data_len is set to the amount of data that needs to be 761 * transferred to the target. This amount depends on whether WRITE SAME 762 * or UNMAP is being used. After the scatterlist has been mapped by 763 * scsi_init_io() we set __data_len to the size of the area to be 764 * discarded on disk. This allows us to report completion on the full 765 * amount of blocks described by the request. 766 */ 767 blk_add_request_payload(rq, page, len); 768 ret = scsi_init_io(cmd); 769 rq->__data_len = nr_bytes; 770 771 out: 772 if (ret != BLKPREP_OK) 773 __free_page(page); 774 return ret; 775 } 776 777 static void sd_config_write_same(struct scsi_disk *sdkp) 778 { 779 struct request_queue *q = sdkp->disk->queue; 780 unsigned int logical_block_size = sdkp->device->sector_size; 781 782 if (sdkp->device->no_write_same) { 783 sdkp->max_ws_blocks = 0; 784 goto out; 785 } 786 787 /* Some devices can not handle block counts above 0xffff despite 788 * supporting WRITE SAME(16). Consequently we default to 64k 789 * blocks per I/O unless the device explicitly advertises a 790 * bigger limit. 791 */ 792 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS) 793 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 794 (u32)SD_MAX_WS16_BLOCKS); 795 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes) 796 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks, 797 (u32)SD_MAX_WS10_BLOCKS); 798 else { 799 sdkp->device->no_write_same = 1; 800 sdkp->max_ws_blocks = 0; 801 } 802 803 out: 804 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks * 805 (logical_block_size >> 9)); 806 } 807 808 /** 809 * sd_setup_write_same_cmnd - write the same data to multiple blocks 810 * @cmd: command to prepare 811 * 812 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on 813 * preference indicated by target device. 814 **/ 815 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd) 816 { 817 struct request *rq = cmd->request; 818 struct scsi_device *sdp = cmd->device; 819 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 820 struct bio *bio = rq->bio; 821 sector_t sector = blk_rq_pos(rq); 822 unsigned int nr_sectors = blk_rq_sectors(rq); 823 unsigned int nr_bytes = blk_rq_bytes(rq); 824 int ret; 825 826 if (sdkp->device->no_write_same) 827 return BLKPREP_KILL; 828 829 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size); 830 831 sector >>= ilog2(sdp->sector_size) - 9; 832 nr_sectors >>= ilog2(sdp->sector_size) - 9; 833 834 rq->timeout = SD_WRITE_SAME_TIMEOUT; 835 836 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) { 837 cmd->cmd_len = 16; 838 cmd->cmnd[0] = WRITE_SAME_16; 839 put_unaligned_be64(sector, &cmd->cmnd[2]); 840 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]); 841 } else { 842 cmd->cmd_len = 10; 843 cmd->cmnd[0] = WRITE_SAME; 844 put_unaligned_be32(sector, &cmd->cmnd[2]); 845 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]); 846 } 847 848 cmd->transfersize = sdp->sector_size; 849 cmd->allowed = SD_MAX_RETRIES; 850 851 /* 852 * For WRITE_SAME the data transferred in the DATA IN buffer is 853 * different from the amount of data actually written to the target. 854 * 855 * We set up __data_len to the amount of data transferred from the 856 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list 857 * to transfer a single sector of data first, but then reset it to 858 * the amount of data to be written right after so that the I/O path 859 * knows how much to actually write. 860 */ 861 rq->__data_len = sdp->sector_size; 862 ret = scsi_init_io(cmd); 863 rq->__data_len = nr_bytes; 864 return ret; 865 } 866 867 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd) 868 { 869 struct request *rq = cmd->request; 870 871 /* flush requests don't perform I/O, zero the S/G table */ 872 memset(&cmd->sdb, 0, sizeof(cmd->sdb)); 873 874 cmd->cmnd[0] = SYNCHRONIZE_CACHE; 875 cmd->cmd_len = 10; 876 cmd->transfersize = 0; 877 cmd->allowed = SD_MAX_RETRIES; 878 879 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER; 880 return BLKPREP_OK; 881 } 882 883 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt) 884 { 885 struct request *rq = SCpnt->request; 886 struct scsi_device *sdp = SCpnt->device; 887 struct gendisk *disk = rq->rq_disk; 888 struct scsi_disk *sdkp; 889 sector_t block = blk_rq_pos(rq); 890 sector_t threshold; 891 unsigned int this_count = blk_rq_sectors(rq); 892 unsigned int dif, dix; 893 int ret; 894 unsigned char protect; 895 896 ret = scsi_init_io(SCpnt); 897 if (ret != BLKPREP_OK) 898 goto out; 899 SCpnt = rq->special; 900 sdkp = scsi_disk(disk); 901 902 /* from here on until we're complete, any goto out 903 * is used for a killable error condition */ 904 ret = BLKPREP_KILL; 905 906 SCSI_LOG_HLQUEUE(1, 907 scmd_printk(KERN_INFO, SCpnt, 908 "%s: block=%llu, count=%d\n", 909 __func__, (unsigned long long)block, this_count)); 910 911 if (!sdp || !scsi_device_online(sdp) || 912 block + blk_rq_sectors(rq) > get_capacity(disk)) { 913 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 914 "Finishing %u sectors\n", 915 blk_rq_sectors(rq))); 916 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 917 "Retry with 0x%p\n", SCpnt)); 918 goto out; 919 } 920 921 if (sdp->changed) { 922 /* 923 * quietly refuse to do anything to a changed disc until 924 * the changed bit has been reset 925 */ 926 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ 927 goto out; 928 } 929 930 /* 931 * Some SD card readers can't handle multi-sector accesses which touch 932 * the last one or two hardware sectors. Split accesses as needed. 933 */ 934 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 935 (sdp->sector_size / 512); 936 937 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 938 if (block < threshold) { 939 /* Access up to the threshold but not beyond */ 940 this_count = threshold - block; 941 } else { 942 /* Access only a single hardware sector */ 943 this_count = sdp->sector_size / 512; 944 } 945 } 946 947 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 948 (unsigned long long)block)); 949 950 /* 951 * If we have a 1K hardware sectorsize, prevent access to single 952 * 512 byte sectors. In theory we could handle this - in fact 953 * the scsi cdrom driver must be able to handle this because 954 * we typically use 1K blocksizes, and cdroms typically have 955 * 2K hardware sectorsizes. Of course, things are simpler 956 * with the cdrom, since it is read-only. For performance 957 * reasons, the filesystems should be able to handle this 958 * and not force the scsi disk driver to use bounce buffers 959 * for this. 960 */ 961 if (sdp->sector_size == 1024) { 962 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 963 scmd_printk(KERN_ERR, SCpnt, 964 "Bad block number requested\n"); 965 goto out; 966 } else { 967 block = block >> 1; 968 this_count = this_count >> 1; 969 } 970 } 971 if (sdp->sector_size == 2048) { 972 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 973 scmd_printk(KERN_ERR, SCpnt, 974 "Bad block number requested\n"); 975 goto out; 976 } else { 977 block = block >> 2; 978 this_count = this_count >> 2; 979 } 980 } 981 if (sdp->sector_size == 4096) { 982 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 983 scmd_printk(KERN_ERR, SCpnt, 984 "Bad block number requested\n"); 985 goto out; 986 } else { 987 block = block >> 3; 988 this_count = this_count >> 3; 989 } 990 } 991 if (rq_data_dir(rq) == WRITE) { 992 SCpnt->cmnd[0] = WRITE_6; 993 994 if (blk_integrity_rq(rq)) 995 sd_dif_prepare(SCpnt); 996 997 } else if (rq_data_dir(rq) == READ) { 998 SCpnt->cmnd[0] = READ_6; 999 } else { 1000 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags); 1001 goto out; 1002 } 1003 1004 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 1005 "%s %d/%u 512 byte blocks.\n", 1006 (rq_data_dir(rq) == WRITE) ? 1007 "writing" : "reading", this_count, 1008 blk_rq_sectors(rq))); 1009 1010 dix = scsi_prot_sg_count(SCpnt); 1011 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type); 1012 1013 if (dif || dix) 1014 protect = sd_setup_protect_cmnd(SCpnt, dix, dif); 1015 else 1016 protect = 0; 1017 1018 if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) { 1019 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 1020 1021 if (unlikely(SCpnt->cmnd == NULL)) { 1022 ret = BLKPREP_DEFER; 1023 goto out; 1024 } 1025 1026 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 1027 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 1028 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 1029 SCpnt->cmnd[7] = 0x18; 1030 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 1031 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1032 1033 /* LBA */ 1034 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1035 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1036 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1037 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1038 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 1039 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 1040 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 1041 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 1042 1043 /* Expected Indirect LBA */ 1044 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 1045 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 1046 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 1047 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 1048 1049 /* Transfer length */ 1050 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 1051 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 1052 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 1053 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 1054 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) { 1055 SCpnt->cmnd[0] += READ_16 - READ_6; 1056 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1057 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 1058 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 1059 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 1060 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 1061 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 1062 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 1063 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 1064 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 1065 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 1066 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 1067 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 1068 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 1069 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 1070 } else if ((this_count > 0xff) || (block > 0x1fffff) || 1071 scsi_device_protection(SCpnt->device) || 1072 SCpnt->device->use_10_for_rw) { 1073 SCpnt->cmnd[0] += READ_10 - READ_6; 1074 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 1075 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 1076 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 1077 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 1078 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 1079 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 1080 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 1081 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 1082 } else { 1083 if (unlikely(rq->cmd_flags & REQ_FUA)) { 1084 /* 1085 * This happens only if this drive failed 1086 * 10byte rw command with ILLEGAL_REQUEST 1087 * during operation and thus turned off 1088 * use_10_for_rw. 1089 */ 1090 scmd_printk(KERN_ERR, SCpnt, 1091 "FUA write on READ/WRITE(6) drive\n"); 1092 goto out; 1093 } 1094 1095 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 1096 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 1097 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 1098 SCpnt->cmnd[4] = (unsigned char) this_count; 1099 SCpnt->cmnd[5] = 0; 1100 } 1101 SCpnt->sdb.length = this_count * sdp->sector_size; 1102 1103 /* 1104 * We shouldn't disconnect in the middle of a sector, so with a dumb 1105 * host adapter, it's safe to assume that we can at least transfer 1106 * this many bytes between each connect / disconnect. 1107 */ 1108 SCpnt->transfersize = sdp->sector_size; 1109 SCpnt->underflow = this_count << 9; 1110 SCpnt->allowed = SD_MAX_RETRIES; 1111 1112 /* 1113 * This indicates that the command is ready from our end to be 1114 * queued. 1115 */ 1116 ret = BLKPREP_OK; 1117 out: 1118 return ret; 1119 } 1120 1121 static int sd_init_command(struct scsi_cmnd *cmd) 1122 { 1123 struct request *rq = cmd->request; 1124 1125 if (rq->cmd_flags & REQ_DISCARD) 1126 return sd_setup_discard_cmnd(cmd); 1127 else if (rq->cmd_flags & REQ_WRITE_SAME) 1128 return sd_setup_write_same_cmnd(cmd); 1129 else if (rq->cmd_flags & REQ_FLUSH) 1130 return sd_setup_flush_cmnd(cmd); 1131 else 1132 return sd_setup_read_write_cmnd(cmd); 1133 } 1134 1135 static void sd_uninit_command(struct scsi_cmnd *SCpnt) 1136 { 1137 struct request *rq = SCpnt->request; 1138 1139 if (rq->cmd_flags & REQ_DISCARD) 1140 __free_page(rq->completion_data); 1141 1142 if (SCpnt->cmnd != rq->cmd) { 1143 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1144 SCpnt->cmnd = NULL; 1145 SCpnt->cmd_len = 0; 1146 } 1147 } 1148 1149 /** 1150 * sd_open - open a scsi disk device 1151 * @inode: only i_rdev member may be used 1152 * @filp: only f_mode and f_flags may be used 1153 * 1154 * Returns 0 if successful. Returns a negated errno value in case 1155 * of error. 1156 * 1157 * Note: This can be called from a user context (e.g. fsck(1) ) 1158 * or from within the kernel (e.g. as a result of a mount(1) ). 1159 * In the latter case @inode and @filp carry an abridged amount 1160 * of information as noted above. 1161 * 1162 * Locking: called with bdev->bd_mutex held. 1163 **/ 1164 static int sd_open(struct block_device *bdev, fmode_t mode) 1165 { 1166 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 1167 struct scsi_device *sdev; 1168 int retval; 1169 1170 if (!sdkp) 1171 return -ENXIO; 1172 1173 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 1174 1175 sdev = sdkp->device; 1176 1177 /* 1178 * If the device is in error recovery, wait until it is done. 1179 * If the device is offline, then disallow any access to it. 1180 */ 1181 retval = -ENXIO; 1182 if (!scsi_block_when_processing_errors(sdev)) 1183 goto error_out; 1184 1185 if (sdev->removable || sdkp->write_prot) 1186 check_disk_change(bdev); 1187 1188 /* 1189 * If the drive is empty, just let the open fail. 1190 */ 1191 retval = -ENOMEDIUM; 1192 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 1193 goto error_out; 1194 1195 /* 1196 * If the device has the write protect tab set, have the open fail 1197 * if the user expects to be able to write to the thing. 1198 */ 1199 retval = -EROFS; 1200 if (sdkp->write_prot && (mode & FMODE_WRITE)) 1201 goto error_out; 1202 1203 /* 1204 * It is possible that the disk changing stuff resulted in 1205 * the device being taken offline. If this is the case, 1206 * report this to the user, and don't pretend that the 1207 * open actually succeeded. 1208 */ 1209 retval = -ENXIO; 1210 if (!scsi_device_online(sdev)) 1211 goto error_out; 1212 1213 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 1214 if (scsi_block_when_processing_errors(sdev)) 1215 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 1216 } 1217 1218 return 0; 1219 1220 error_out: 1221 scsi_disk_put(sdkp); 1222 return retval; 1223 } 1224 1225 /** 1226 * sd_release - invoked when the (last) close(2) is called on this 1227 * scsi disk. 1228 * @inode: only i_rdev member may be used 1229 * @filp: only f_mode and f_flags may be used 1230 * 1231 * Returns 0. 1232 * 1233 * Note: may block (uninterruptible) if error recovery is underway 1234 * on this disk. 1235 * 1236 * Locking: called with bdev->bd_mutex held. 1237 **/ 1238 static void sd_release(struct gendisk *disk, fmode_t mode) 1239 { 1240 struct scsi_disk *sdkp = scsi_disk(disk); 1241 struct scsi_device *sdev = sdkp->device; 1242 1243 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 1244 1245 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 1246 if (scsi_block_when_processing_errors(sdev)) 1247 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 1248 } 1249 1250 /* 1251 * XXX and what if there are packets in flight and this close() 1252 * XXX is followed by a "rmmod sd_mod"? 1253 */ 1254 1255 scsi_disk_put(sdkp); 1256 } 1257 1258 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1259 { 1260 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 1261 struct scsi_device *sdp = sdkp->device; 1262 struct Scsi_Host *host = sdp->host; 1263 int diskinfo[4]; 1264 1265 /* default to most commonly used values */ 1266 diskinfo[0] = 0x40; /* 1 << 6 */ 1267 diskinfo[1] = 0x20; /* 1 << 5 */ 1268 diskinfo[2] = sdkp->capacity >> 11; 1269 1270 /* override with calculated, extended default, or driver values */ 1271 if (host->hostt->bios_param) 1272 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 1273 else 1274 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 1275 1276 geo->heads = diskinfo[0]; 1277 geo->sectors = diskinfo[1]; 1278 geo->cylinders = diskinfo[2]; 1279 return 0; 1280 } 1281 1282 /** 1283 * sd_ioctl - process an ioctl 1284 * @inode: only i_rdev/i_bdev members may be used 1285 * @filp: only f_mode and f_flags may be used 1286 * @cmd: ioctl command number 1287 * @arg: this is third argument given to ioctl(2) system call. 1288 * Often contains a pointer. 1289 * 1290 * Returns 0 if successful (some ioctls return positive numbers on 1291 * success as well). Returns a negated errno value in case of error. 1292 * 1293 * Note: most ioctls are forward onto the block subsystem or further 1294 * down in the scsi subsystem. 1295 **/ 1296 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 1297 unsigned int cmd, unsigned long arg) 1298 { 1299 struct gendisk *disk = bdev->bd_disk; 1300 struct scsi_disk *sdkp = scsi_disk(disk); 1301 struct scsi_device *sdp = sdkp->device; 1302 void __user *p = (void __user *)arg; 1303 int error; 1304 1305 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " 1306 "cmd=0x%x\n", disk->disk_name, cmd)); 1307 1308 error = scsi_verify_blk_ioctl(bdev, cmd); 1309 if (error < 0) 1310 return error; 1311 1312 /* 1313 * If we are in the middle of error recovery, don't let anyone 1314 * else try and use this device. Also, if error recovery fails, it 1315 * may try and take the device offline, in which case all further 1316 * access to the device is prohibited. 1317 */ 1318 error = scsi_ioctl_block_when_processing_errors(sdp, cmd, 1319 (mode & FMODE_NDELAY) != 0); 1320 if (error) 1321 goto out; 1322 1323 /* 1324 * Send SCSI addressing ioctls directly to mid level, send other 1325 * ioctls to block level and then onto mid level if they can't be 1326 * resolved. 1327 */ 1328 switch (cmd) { 1329 case SCSI_IOCTL_GET_IDLUN: 1330 case SCSI_IOCTL_GET_BUS_NUMBER: 1331 error = scsi_ioctl(sdp, cmd, p); 1332 break; 1333 default: 1334 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); 1335 if (error != -ENOTTY) 1336 break; 1337 error = scsi_ioctl(sdp, cmd, p); 1338 break; 1339 } 1340 out: 1341 return error; 1342 } 1343 1344 static void set_media_not_present(struct scsi_disk *sdkp) 1345 { 1346 if (sdkp->media_present) 1347 sdkp->device->changed = 1; 1348 1349 if (sdkp->device->removable) { 1350 sdkp->media_present = 0; 1351 sdkp->capacity = 0; 1352 } 1353 } 1354 1355 static int media_not_present(struct scsi_disk *sdkp, 1356 struct scsi_sense_hdr *sshdr) 1357 { 1358 if (!scsi_sense_valid(sshdr)) 1359 return 0; 1360 1361 /* not invoked for commands that could return deferred errors */ 1362 switch (sshdr->sense_key) { 1363 case UNIT_ATTENTION: 1364 case NOT_READY: 1365 /* medium not present */ 1366 if (sshdr->asc == 0x3A) { 1367 set_media_not_present(sdkp); 1368 return 1; 1369 } 1370 } 1371 return 0; 1372 } 1373 1374 /** 1375 * sd_check_events - check media events 1376 * @disk: kernel device descriptor 1377 * @clearing: disk events currently being cleared 1378 * 1379 * Returns mask of DISK_EVENT_*. 1380 * 1381 * Note: this function is invoked from the block subsystem. 1382 **/ 1383 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) 1384 { 1385 struct scsi_disk *sdkp = scsi_disk(disk); 1386 struct scsi_device *sdp = sdkp->device; 1387 struct scsi_sense_hdr *sshdr = NULL; 1388 int retval; 1389 1390 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); 1391 1392 /* 1393 * If the device is offline, don't send any commands - just pretend as 1394 * if the command failed. If the device ever comes back online, we 1395 * can deal with it then. It is only because of unrecoverable errors 1396 * that we would ever take a device offline in the first place. 1397 */ 1398 if (!scsi_device_online(sdp)) { 1399 set_media_not_present(sdkp); 1400 goto out; 1401 } 1402 1403 /* 1404 * Using TEST_UNIT_READY enables differentiation between drive with 1405 * no cartridge loaded - NOT READY, drive with changed cartridge - 1406 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1407 * 1408 * Drives that auto spin down. eg iomega jaz 1G, will be started 1409 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1410 * sd_revalidate() is called. 1411 */ 1412 retval = -ENODEV; 1413 1414 if (scsi_block_when_processing_errors(sdp)) { 1415 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 1416 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1417 sshdr); 1418 } 1419 1420 /* failed to execute TUR, assume media not present */ 1421 if (host_byte(retval)) { 1422 set_media_not_present(sdkp); 1423 goto out; 1424 } 1425 1426 if (media_not_present(sdkp, sshdr)) 1427 goto out; 1428 1429 /* 1430 * For removable scsi disk we have to recognise the presence 1431 * of a disk in the drive. 1432 */ 1433 if (!sdkp->media_present) 1434 sdp->changed = 1; 1435 sdkp->media_present = 1; 1436 out: 1437 /* 1438 * sdp->changed is set under the following conditions: 1439 * 1440 * Medium present state has changed in either direction. 1441 * Device has indicated UNIT_ATTENTION. 1442 */ 1443 kfree(sshdr); 1444 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1445 sdp->changed = 0; 1446 return retval; 1447 } 1448 1449 static int sd_sync_cache(struct scsi_disk *sdkp) 1450 { 1451 int retries, res; 1452 struct scsi_device *sdp = sdkp->device; 1453 const int timeout = sdp->request_queue->rq_timeout 1454 * SD_FLUSH_TIMEOUT_MULTIPLIER; 1455 struct scsi_sense_hdr sshdr; 1456 1457 if (!scsi_device_online(sdp)) 1458 return -ENODEV; 1459 1460 for (retries = 3; retries > 0; --retries) { 1461 unsigned char cmd[10] = { 0 }; 1462 1463 cmd[0] = SYNCHRONIZE_CACHE; 1464 /* 1465 * Leave the rest of the command zero to indicate 1466 * flush everything. 1467 */ 1468 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, 1469 &sshdr, timeout, SD_MAX_RETRIES, 1470 NULL, REQ_PM); 1471 if (res == 0) 1472 break; 1473 } 1474 1475 if (res) { 1476 sd_print_result(sdkp, "Synchronize Cache(10) failed", res); 1477 1478 if (driver_byte(res) & DRIVER_SENSE) 1479 sd_print_sense_hdr(sdkp, &sshdr); 1480 /* we need to evaluate the error return */ 1481 if (scsi_sense_valid(&sshdr) && 1482 (sshdr.asc == 0x3a || /* medium not present */ 1483 sshdr.asc == 0x20)) /* invalid command */ 1484 /* this is no error here */ 1485 return 0; 1486 1487 switch (host_byte(res)) { 1488 /* ignore errors due to racing a disconnection */ 1489 case DID_BAD_TARGET: 1490 case DID_NO_CONNECT: 1491 return 0; 1492 /* signal the upper layer it might try again */ 1493 case DID_BUS_BUSY: 1494 case DID_IMM_RETRY: 1495 case DID_REQUEUE: 1496 case DID_SOFT_ERROR: 1497 return -EBUSY; 1498 default: 1499 return -EIO; 1500 } 1501 } 1502 return 0; 1503 } 1504 1505 static void sd_rescan(struct device *dev) 1506 { 1507 struct scsi_disk *sdkp = dev_get_drvdata(dev); 1508 1509 revalidate_disk(sdkp->disk); 1510 } 1511 1512 1513 #ifdef CONFIG_COMPAT 1514 /* 1515 * This gets directly called from VFS. When the ioctl 1516 * is not recognized we go back to the other translation paths. 1517 */ 1518 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1519 unsigned int cmd, unsigned long arg) 1520 { 1521 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1522 int error; 1523 1524 error = scsi_ioctl_block_when_processing_errors(sdev, cmd, 1525 (mode & FMODE_NDELAY) != 0); 1526 if (error) 1527 return error; 1528 1529 /* 1530 * Let the static ioctl translation table take care of it. 1531 */ 1532 if (!sdev->host->hostt->compat_ioctl) 1533 return -ENOIOCTLCMD; 1534 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1535 } 1536 #endif 1537 1538 static const struct block_device_operations sd_fops = { 1539 .owner = THIS_MODULE, 1540 .open = sd_open, 1541 .release = sd_release, 1542 .ioctl = sd_ioctl, 1543 .getgeo = sd_getgeo, 1544 #ifdef CONFIG_COMPAT 1545 .compat_ioctl = sd_compat_ioctl, 1546 #endif 1547 .check_events = sd_check_events, 1548 .revalidate_disk = sd_revalidate_disk, 1549 .unlock_native_capacity = sd_unlock_native_capacity, 1550 }; 1551 1552 /** 1553 * sd_eh_action - error handling callback 1554 * @scmd: sd-issued command that has failed 1555 * @eh_disp: The recovery disposition suggested by the midlayer 1556 * 1557 * This function is called by the SCSI midlayer upon completion of an 1558 * error test command (currently TEST UNIT READY). The result of sending 1559 * the eh command is passed in eh_disp. We're looking for devices that 1560 * fail medium access commands but are OK with non access commands like 1561 * test unit ready (so wrongly see the device as having a successful 1562 * recovery) 1563 **/ 1564 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp) 1565 { 1566 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1567 1568 if (!scsi_device_online(scmd->device) || 1569 !scsi_medium_access_command(scmd) || 1570 host_byte(scmd->result) != DID_TIME_OUT || 1571 eh_disp != SUCCESS) 1572 return eh_disp; 1573 1574 /* 1575 * The device has timed out executing a medium access command. 1576 * However, the TEST UNIT READY command sent during error 1577 * handling completed successfully. Either the device is in the 1578 * process of recovering or has it suffered an internal failure 1579 * that prevents access to the storage medium. 1580 */ 1581 sdkp->medium_access_timed_out++; 1582 1583 /* 1584 * If the device keeps failing read/write commands but TEST UNIT 1585 * READY always completes successfully we assume that medium 1586 * access is no longer possible and take the device offline. 1587 */ 1588 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { 1589 scmd_printk(KERN_ERR, scmd, 1590 "Medium access timeout failure. Offlining disk!\n"); 1591 scsi_device_set_state(scmd->device, SDEV_OFFLINE); 1592 1593 return FAILED; 1594 } 1595 1596 return eh_disp; 1597 } 1598 1599 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1600 { 1601 u64 start_lba = blk_rq_pos(scmd->request); 1602 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1603 u64 bad_lba; 1604 int info_valid; 1605 /* 1606 * resid is optional but mostly filled in. When it's unused, 1607 * its value is zero, so we assume the whole buffer transferred 1608 */ 1609 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 1610 unsigned int good_bytes; 1611 1612 if (scmd->request->cmd_type != REQ_TYPE_FS) 1613 return 0; 1614 1615 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1616 SCSI_SENSE_BUFFERSIZE, 1617 &bad_lba); 1618 if (!info_valid) 1619 return 0; 1620 1621 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1622 return 0; 1623 1624 if (scmd->device->sector_size < 512) { 1625 /* only legitimate sector_size here is 256 */ 1626 start_lba <<= 1; 1627 end_lba <<= 1; 1628 } else { 1629 /* be careful ... don't want any overflows */ 1630 unsigned int factor = scmd->device->sector_size / 512; 1631 do_div(start_lba, factor); 1632 do_div(end_lba, factor); 1633 } 1634 1635 /* The bad lba was reported incorrectly, we have no idea where 1636 * the error is. 1637 */ 1638 if (bad_lba < start_lba || bad_lba >= end_lba) 1639 return 0; 1640 1641 /* This computation should always be done in terms of 1642 * the resolution of the device's medium. 1643 */ 1644 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; 1645 return min(good_bytes, transferred); 1646 } 1647 1648 /** 1649 * sd_done - bottom half handler: called when the lower level 1650 * driver has completed (successfully or otherwise) a scsi command. 1651 * @SCpnt: mid-level's per command structure. 1652 * 1653 * Note: potentially run from within an ISR. Must not block. 1654 **/ 1655 static int sd_done(struct scsi_cmnd *SCpnt) 1656 { 1657 int result = SCpnt->result; 1658 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1659 struct scsi_sense_hdr sshdr; 1660 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1661 struct request *req = SCpnt->request; 1662 int sense_valid = 0; 1663 int sense_deferred = 0; 1664 unsigned char op = SCpnt->cmnd[0]; 1665 unsigned char unmap = SCpnt->cmnd[1] & 8; 1666 1667 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) { 1668 if (!result) { 1669 good_bytes = blk_rq_bytes(req); 1670 scsi_set_resid(SCpnt, 0); 1671 } else { 1672 good_bytes = 0; 1673 scsi_set_resid(SCpnt, blk_rq_bytes(req)); 1674 } 1675 } 1676 1677 if (result) { 1678 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1679 if (sense_valid) 1680 sense_deferred = scsi_sense_is_deferred(&sshdr); 1681 } 1682 sdkp->medium_access_timed_out = 0; 1683 1684 if (driver_byte(result) != DRIVER_SENSE && 1685 (!sense_valid || sense_deferred)) 1686 goto out; 1687 1688 switch (sshdr.sense_key) { 1689 case HARDWARE_ERROR: 1690 case MEDIUM_ERROR: 1691 good_bytes = sd_completed_bytes(SCpnt); 1692 break; 1693 case RECOVERED_ERROR: 1694 good_bytes = scsi_bufflen(SCpnt); 1695 break; 1696 case NO_SENSE: 1697 /* This indicates a false check condition, so ignore it. An 1698 * unknown amount of data was transferred so treat it as an 1699 * error. 1700 */ 1701 SCpnt->result = 0; 1702 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1703 break; 1704 case ABORTED_COMMAND: 1705 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 1706 good_bytes = sd_completed_bytes(SCpnt); 1707 break; 1708 case ILLEGAL_REQUEST: 1709 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */ 1710 good_bytes = sd_completed_bytes(SCpnt); 1711 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ 1712 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) { 1713 switch (op) { 1714 case UNMAP: 1715 sd_config_discard(sdkp, SD_LBP_DISABLE); 1716 break; 1717 case WRITE_SAME_16: 1718 case WRITE_SAME: 1719 if (unmap) 1720 sd_config_discard(sdkp, SD_LBP_DISABLE); 1721 else { 1722 sdkp->device->no_write_same = 1; 1723 sd_config_write_same(sdkp); 1724 1725 good_bytes = 0; 1726 req->__data_len = blk_rq_bytes(req); 1727 req->cmd_flags |= REQ_QUIET; 1728 } 1729 } 1730 } 1731 break; 1732 default: 1733 break; 1734 } 1735 out: 1736 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1737 "sd_done: completed %d of %d bytes\n", 1738 good_bytes, scsi_bufflen(SCpnt))); 1739 1740 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1741 sd_dif_complete(SCpnt, good_bytes); 1742 1743 return good_bytes; 1744 } 1745 1746 /* 1747 * spinup disk - called only in sd_revalidate_disk() 1748 */ 1749 static void 1750 sd_spinup_disk(struct scsi_disk *sdkp) 1751 { 1752 unsigned char cmd[10]; 1753 unsigned long spintime_expire = 0; 1754 int retries, spintime; 1755 unsigned int the_result; 1756 struct scsi_sense_hdr sshdr; 1757 int sense_valid = 0; 1758 1759 spintime = 0; 1760 1761 /* Spin up drives, as required. Only do this at boot time */ 1762 /* Spinup needs to be done for module loads too. */ 1763 do { 1764 retries = 0; 1765 1766 do { 1767 cmd[0] = TEST_UNIT_READY; 1768 memset((void *) &cmd[1], 0, 9); 1769 1770 the_result = scsi_execute_req(sdkp->device, cmd, 1771 DMA_NONE, NULL, 0, 1772 &sshdr, SD_TIMEOUT, 1773 SD_MAX_RETRIES, NULL); 1774 1775 /* 1776 * If the drive has indicated to us that it 1777 * doesn't have any media in it, don't bother 1778 * with any more polling. 1779 */ 1780 if (media_not_present(sdkp, &sshdr)) 1781 return; 1782 1783 if (the_result) 1784 sense_valid = scsi_sense_valid(&sshdr); 1785 retries++; 1786 } while (retries < 3 && 1787 (!scsi_status_is_good(the_result) || 1788 ((driver_byte(the_result) & DRIVER_SENSE) && 1789 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1790 1791 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1792 /* no sense, TUR either succeeded or failed 1793 * with a status error */ 1794 if(!spintime && !scsi_status_is_good(the_result)) { 1795 sd_print_result(sdkp, "Test Unit Ready failed", 1796 the_result); 1797 } 1798 break; 1799 } 1800 1801 /* 1802 * The device does not want the automatic start to be issued. 1803 */ 1804 if (sdkp->device->no_start_on_add) 1805 break; 1806 1807 if (sense_valid && sshdr.sense_key == NOT_READY) { 1808 if (sshdr.asc == 4 && sshdr.ascq == 3) 1809 break; /* manual intervention required */ 1810 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1811 break; /* standby */ 1812 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1813 break; /* unavailable */ 1814 /* 1815 * Issue command to spin up drive when not ready 1816 */ 1817 if (!spintime) { 1818 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1819 cmd[0] = START_STOP; 1820 cmd[1] = 1; /* Return immediately */ 1821 memset((void *) &cmd[2], 0, 8); 1822 cmd[4] = 1; /* Start spin cycle */ 1823 if (sdkp->device->start_stop_pwr_cond) 1824 cmd[4] |= 1 << 4; 1825 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1826 NULL, 0, &sshdr, 1827 SD_TIMEOUT, SD_MAX_RETRIES, 1828 NULL); 1829 spintime_expire = jiffies + 100 * HZ; 1830 spintime = 1; 1831 } 1832 /* Wait 1 second for next try */ 1833 msleep(1000); 1834 printk("."); 1835 1836 /* 1837 * Wait for USB flash devices with slow firmware. 1838 * Yes, this sense key/ASC combination shouldn't 1839 * occur here. It's characteristic of these devices. 1840 */ 1841 } else if (sense_valid && 1842 sshdr.sense_key == UNIT_ATTENTION && 1843 sshdr.asc == 0x28) { 1844 if (!spintime) { 1845 spintime_expire = jiffies + 5 * HZ; 1846 spintime = 1; 1847 } 1848 /* Wait 1 second for next try */ 1849 msleep(1000); 1850 } else { 1851 /* we don't understand the sense code, so it's 1852 * probably pointless to loop */ 1853 if(!spintime) { 1854 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1855 sd_print_sense_hdr(sdkp, &sshdr); 1856 } 1857 break; 1858 } 1859 1860 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1861 1862 if (spintime) { 1863 if (scsi_status_is_good(the_result)) 1864 printk("ready\n"); 1865 else 1866 printk("not responding...\n"); 1867 } 1868 } 1869 1870 1871 /* 1872 * Determine whether disk supports Data Integrity Field. 1873 */ 1874 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1875 { 1876 struct scsi_device *sdp = sdkp->device; 1877 u8 type; 1878 int ret = 0; 1879 1880 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1881 return ret; 1882 1883 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1884 1885 if (type > SD_DIF_TYPE3_PROTECTION) 1886 ret = -ENODEV; 1887 else if (scsi_host_dif_capable(sdp->host, type)) 1888 ret = 1; 1889 1890 if (sdkp->first_scan || type != sdkp->protection_type) 1891 switch (ret) { 1892 case -ENODEV: 1893 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ 1894 " protection type %u. Disabling disk!\n", 1895 type); 1896 break; 1897 case 1: 1898 sd_printk(KERN_NOTICE, sdkp, 1899 "Enabling DIF Type %u protection\n", type); 1900 break; 1901 case 0: 1902 sd_printk(KERN_NOTICE, sdkp, 1903 "Disabling DIF Type %u protection\n", type); 1904 break; 1905 } 1906 1907 sdkp->protection_type = type; 1908 1909 return ret; 1910 } 1911 1912 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1913 struct scsi_sense_hdr *sshdr, int sense_valid, 1914 int the_result) 1915 { 1916 if (driver_byte(the_result) & DRIVER_SENSE) 1917 sd_print_sense_hdr(sdkp, sshdr); 1918 else 1919 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1920 1921 /* 1922 * Set dirty bit for removable devices if not ready - 1923 * sometimes drives will not report this properly. 1924 */ 1925 if (sdp->removable && 1926 sense_valid && sshdr->sense_key == NOT_READY) 1927 set_media_not_present(sdkp); 1928 1929 /* 1930 * We used to set media_present to 0 here to indicate no media 1931 * in the drive, but some drives fail read capacity even with 1932 * media present, so we can't do that. 1933 */ 1934 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1935 } 1936 1937 #define RC16_LEN 32 1938 #if RC16_LEN > SD_BUF_SIZE 1939 #error RC16_LEN must not be more than SD_BUF_SIZE 1940 #endif 1941 1942 #define READ_CAPACITY_RETRIES_ON_RESET 10 1943 1944 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1945 unsigned char *buffer) 1946 { 1947 unsigned char cmd[16]; 1948 struct scsi_sense_hdr sshdr; 1949 int sense_valid = 0; 1950 int the_result; 1951 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1952 unsigned int alignment; 1953 unsigned long long lba; 1954 unsigned sector_size; 1955 1956 if (sdp->no_read_capacity_16) 1957 return -EINVAL; 1958 1959 do { 1960 memset(cmd, 0, 16); 1961 cmd[0] = SERVICE_ACTION_IN_16; 1962 cmd[1] = SAI_READ_CAPACITY_16; 1963 cmd[13] = RC16_LEN; 1964 memset(buffer, 0, RC16_LEN); 1965 1966 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1967 buffer, RC16_LEN, &sshdr, 1968 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1969 1970 if (media_not_present(sdkp, &sshdr)) 1971 return -ENODEV; 1972 1973 if (the_result) { 1974 sense_valid = scsi_sense_valid(&sshdr); 1975 if (sense_valid && 1976 sshdr.sense_key == ILLEGAL_REQUEST && 1977 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1978 sshdr.ascq == 0x00) 1979 /* Invalid Command Operation Code or 1980 * Invalid Field in CDB, just retry 1981 * silently with RC10 */ 1982 return -EINVAL; 1983 if (sense_valid && 1984 sshdr.sense_key == UNIT_ATTENTION && 1985 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1986 /* Device reset might occur several times, 1987 * give it one more chance */ 1988 if (--reset_retries > 0) 1989 continue; 1990 } 1991 retries--; 1992 1993 } while (the_result && retries); 1994 1995 if (the_result) { 1996 sd_print_result(sdkp, "Read Capacity(16) failed", the_result); 1997 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1998 return -EINVAL; 1999 } 2000 2001 sector_size = get_unaligned_be32(&buffer[8]); 2002 lba = get_unaligned_be64(&buffer[0]); 2003 2004 if (sd_read_protection_type(sdkp, buffer) < 0) { 2005 sdkp->capacity = 0; 2006 return -ENODEV; 2007 } 2008 2009 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 2010 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2011 "kernel compiled with support for large block " 2012 "devices.\n"); 2013 sdkp->capacity = 0; 2014 return -EOVERFLOW; 2015 } 2016 2017 /* Logical blocks per physical block exponent */ 2018 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 2019 2020 /* Lowest aligned logical block */ 2021 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 2022 blk_queue_alignment_offset(sdp->request_queue, alignment); 2023 if (alignment && sdkp->first_scan) 2024 sd_printk(KERN_NOTICE, sdkp, 2025 "physical block alignment offset: %u\n", alignment); 2026 2027 if (buffer[14] & 0x80) { /* LBPME */ 2028 sdkp->lbpme = 1; 2029 2030 if (buffer[14] & 0x40) /* LBPRZ */ 2031 sdkp->lbprz = 1; 2032 2033 sd_config_discard(sdkp, SD_LBP_WS16); 2034 } 2035 2036 sdkp->capacity = lba + 1; 2037 return sector_size; 2038 } 2039 2040 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 2041 unsigned char *buffer) 2042 { 2043 unsigned char cmd[16]; 2044 struct scsi_sense_hdr sshdr; 2045 int sense_valid = 0; 2046 int the_result; 2047 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 2048 sector_t lba; 2049 unsigned sector_size; 2050 2051 do { 2052 cmd[0] = READ_CAPACITY; 2053 memset(&cmd[1], 0, 9); 2054 memset(buffer, 0, 8); 2055 2056 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 2057 buffer, 8, &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 == UNIT_ATTENTION && 2067 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 2068 /* Device reset might occur several times, 2069 * give it one more chance */ 2070 if (--reset_retries > 0) 2071 continue; 2072 } 2073 retries--; 2074 2075 } while (the_result && retries); 2076 2077 if (the_result) { 2078 sd_print_result(sdkp, "Read Capacity(10) failed", the_result); 2079 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 2080 return -EINVAL; 2081 } 2082 2083 sector_size = get_unaligned_be32(&buffer[4]); 2084 lba = get_unaligned_be32(&buffer[0]); 2085 2086 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 2087 /* Some buggy (usb cardreader) devices return an lba of 2088 0xffffffff when the want to report a size of 0 (with 2089 which they really mean no media is present) */ 2090 sdkp->capacity = 0; 2091 sdkp->physical_block_size = sector_size; 2092 return sector_size; 2093 } 2094 2095 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 2096 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 2097 "kernel compiled with support for large block " 2098 "devices.\n"); 2099 sdkp->capacity = 0; 2100 return -EOVERFLOW; 2101 } 2102 2103 sdkp->capacity = lba + 1; 2104 sdkp->physical_block_size = sector_size; 2105 return sector_size; 2106 } 2107 2108 static int sd_try_rc16_first(struct scsi_device *sdp) 2109 { 2110 if (sdp->host->max_cmd_len < 16) 2111 return 0; 2112 if (sdp->try_rc_10_first) 2113 return 0; 2114 if (sdp->scsi_level > SCSI_SPC_2) 2115 return 1; 2116 if (scsi_device_protection(sdp)) 2117 return 1; 2118 return 0; 2119 } 2120 2121 /* 2122 * read disk capacity 2123 */ 2124 static void 2125 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 2126 { 2127 int sector_size; 2128 struct scsi_device *sdp = sdkp->device; 2129 sector_t old_capacity = sdkp->capacity; 2130 2131 if (sd_try_rc16_first(sdp)) { 2132 sector_size = read_capacity_16(sdkp, sdp, buffer); 2133 if (sector_size == -EOVERFLOW) 2134 goto got_data; 2135 if (sector_size == -ENODEV) 2136 return; 2137 if (sector_size < 0) 2138 sector_size = read_capacity_10(sdkp, sdp, buffer); 2139 if (sector_size < 0) 2140 return; 2141 } else { 2142 sector_size = read_capacity_10(sdkp, sdp, buffer); 2143 if (sector_size == -EOVERFLOW) 2144 goto got_data; 2145 if (sector_size < 0) 2146 return; 2147 if ((sizeof(sdkp->capacity) > 4) && 2148 (sdkp->capacity > 0xffffffffULL)) { 2149 int old_sector_size = sector_size; 2150 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 2151 "Trying to use READ CAPACITY(16).\n"); 2152 sector_size = read_capacity_16(sdkp, sdp, buffer); 2153 if (sector_size < 0) { 2154 sd_printk(KERN_NOTICE, sdkp, 2155 "Using 0xffffffff as device size\n"); 2156 sdkp->capacity = 1 + (sector_t) 0xffffffff; 2157 sector_size = old_sector_size; 2158 goto got_data; 2159 } 2160 } 2161 } 2162 2163 /* Some devices are known to return the total number of blocks, 2164 * not the highest block number. Some devices have versions 2165 * which do this and others which do not. Some devices we might 2166 * suspect of doing this but we don't know for certain. 2167 * 2168 * If we know the reported capacity is wrong, decrement it. If 2169 * we can only guess, then assume the number of blocks is even 2170 * (usually true but not always) and err on the side of lowering 2171 * the capacity. 2172 */ 2173 if (sdp->fix_capacity || 2174 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 2175 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 2176 "from its reported value: %llu\n", 2177 (unsigned long long) sdkp->capacity); 2178 --sdkp->capacity; 2179 } 2180 2181 got_data: 2182 if (sector_size == 0) { 2183 sector_size = 512; 2184 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 2185 "assuming 512.\n"); 2186 } 2187 2188 if (sector_size != 512 && 2189 sector_size != 1024 && 2190 sector_size != 2048 && 2191 sector_size != 4096 && 2192 sector_size != 256) { 2193 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 2194 sector_size); 2195 /* 2196 * The user might want to re-format the drive with 2197 * a supported sectorsize. Once this happens, it 2198 * would be relatively trivial to set the thing up. 2199 * For this reason, we leave the thing in the table. 2200 */ 2201 sdkp->capacity = 0; 2202 /* 2203 * set a bogus sector size so the normal read/write 2204 * logic in the block layer will eventually refuse any 2205 * request on this device without tripping over power 2206 * of two sector size assumptions 2207 */ 2208 sector_size = 512; 2209 } 2210 blk_queue_logical_block_size(sdp->request_queue, sector_size); 2211 2212 { 2213 char cap_str_2[10], cap_str_10[10]; 2214 2215 string_get_size(sdkp->capacity, sector_size, 2216 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); 2217 string_get_size(sdkp->capacity, sector_size, 2218 STRING_UNITS_10, cap_str_10, 2219 sizeof(cap_str_10)); 2220 2221 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 2222 sd_printk(KERN_NOTICE, sdkp, 2223 "%llu %d-byte logical blocks: (%s/%s)\n", 2224 (unsigned long long)sdkp->capacity, 2225 sector_size, cap_str_10, cap_str_2); 2226 2227 if (sdkp->physical_block_size != sector_size) 2228 sd_printk(KERN_NOTICE, sdkp, 2229 "%u-byte physical blocks\n", 2230 sdkp->physical_block_size); 2231 } 2232 } 2233 2234 if (sdkp->capacity > 0xffffffff) { 2235 sdp->use_16_for_rw = 1; 2236 sdkp->max_xfer_blocks = SD_MAX_XFER_BLOCKS; 2237 } else 2238 sdkp->max_xfer_blocks = SD_DEF_XFER_BLOCKS; 2239 2240 /* Rescale capacity to 512-byte units */ 2241 if (sector_size == 4096) 2242 sdkp->capacity <<= 3; 2243 else if (sector_size == 2048) 2244 sdkp->capacity <<= 2; 2245 else if (sector_size == 1024) 2246 sdkp->capacity <<= 1; 2247 else if (sector_size == 256) 2248 sdkp->capacity >>= 1; 2249 2250 blk_queue_physical_block_size(sdp->request_queue, 2251 sdkp->physical_block_size); 2252 sdkp->device->sector_size = sector_size; 2253 } 2254 2255 /* called with buffer of length 512 */ 2256 static inline int 2257 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 2258 unsigned char *buffer, int len, struct scsi_mode_data *data, 2259 struct scsi_sense_hdr *sshdr) 2260 { 2261 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 2262 SD_TIMEOUT, SD_MAX_RETRIES, data, 2263 sshdr); 2264 } 2265 2266 /* 2267 * read write protect setting, if possible - called only in sd_revalidate_disk() 2268 * called with buffer of length SD_BUF_SIZE 2269 */ 2270 static void 2271 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 2272 { 2273 int res; 2274 struct scsi_device *sdp = sdkp->device; 2275 struct scsi_mode_data data; 2276 int old_wp = sdkp->write_prot; 2277 2278 set_disk_ro(sdkp->disk, 0); 2279 if (sdp->skip_ms_page_3f) { 2280 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 2281 return; 2282 } 2283 2284 if (sdp->use_192_bytes_for_3f) { 2285 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 2286 } else { 2287 /* 2288 * First attempt: ask for all pages (0x3F), but only 4 bytes. 2289 * We have to start carefully: some devices hang if we ask 2290 * for more than is available. 2291 */ 2292 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 2293 2294 /* 2295 * Second attempt: ask for page 0 When only page 0 is 2296 * implemented, a request for page 3F may return Sense Key 2297 * 5: Illegal Request, Sense Code 24: Invalid field in 2298 * CDB. 2299 */ 2300 if (!scsi_status_is_good(res)) 2301 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 2302 2303 /* 2304 * Third attempt: ask 255 bytes, as we did earlier. 2305 */ 2306 if (!scsi_status_is_good(res)) 2307 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 2308 &data, NULL); 2309 } 2310 2311 if (!scsi_status_is_good(res)) { 2312 sd_first_printk(KERN_WARNING, sdkp, 2313 "Test WP failed, assume Write Enabled\n"); 2314 } else { 2315 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 2316 set_disk_ro(sdkp->disk, sdkp->write_prot); 2317 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 2318 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 2319 sdkp->write_prot ? "on" : "off"); 2320 sd_printk(KERN_DEBUG, sdkp, 2321 "Mode Sense: %02x %02x %02x %02x\n", 2322 buffer[0], buffer[1], buffer[2], buffer[3]); 2323 } 2324 } 2325 } 2326 2327 /* 2328 * sd_read_cache_type - called only from sd_revalidate_disk() 2329 * called with buffer of length SD_BUF_SIZE 2330 */ 2331 static void 2332 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 2333 { 2334 int len = 0, res; 2335 struct scsi_device *sdp = sdkp->device; 2336 2337 int dbd; 2338 int modepage; 2339 int first_len; 2340 struct scsi_mode_data data; 2341 struct scsi_sense_hdr sshdr; 2342 int old_wce = sdkp->WCE; 2343 int old_rcd = sdkp->RCD; 2344 int old_dpofua = sdkp->DPOFUA; 2345 2346 2347 if (sdkp->cache_override) 2348 return; 2349 2350 first_len = 4; 2351 if (sdp->skip_ms_page_8) { 2352 if (sdp->type == TYPE_RBC) 2353 goto defaults; 2354 else { 2355 if (sdp->skip_ms_page_3f) 2356 goto defaults; 2357 modepage = 0x3F; 2358 if (sdp->use_192_bytes_for_3f) 2359 first_len = 192; 2360 dbd = 0; 2361 } 2362 } else if (sdp->type == TYPE_RBC) { 2363 modepage = 6; 2364 dbd = 8; 2365 } else { 2366 modepage = 8; 2367 dbd = 0; 2368 } 2369 2370 /* cautiously ask */ 2371 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, 2372 &data, &sshdr); 2373 2374 if (!scsi_status_is_good(res)) 2375 goto bad_sense; 2376 2377 if (!data.header_length) { 2378 modepage = 6; 2379 first_len = 0; 2380 sd_first_printk(KERN_ERR, sdkp, 2381 "Missing header in MODE_SENSE response\n"); 2382 } 2383 2384 /* that went OK, now ask for the proper length */ 2385 len = data.length; 2386 2387 /* 2388 * We're only interested in the first three bytes, actually. 2389 * But the data cache page is defined for the first 20. 2390 */ 2391 if (len < 3) 2392 goto bad_sense; 2393 else if (len > SD_BUF_SIZE) { 2394 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " 2395 "data from %d to %d bytes\n", len, SD_BUF_SIZE); 2396 len = SD_BUF_SIZE; 2397 } 2398 if (modepage == 0x3F && sdp->use_192_bytes_for_3f) 2399 len = 192; 2400 2401 /* Get the data */ 2402 if (len > first_len) 2403 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, 2404 &data, &sshdr); 2405 2406 if (scsi_status_is_good(res)) { 2407 int offset = data.header_length + data.block_descriptor_length; 2408 2409 while (offset < len) { 2410 u8 page_code = buffer[offset] & 0x3F; 2411 u8 spf = buffer[offset] & 0x40; 2412 2413 if (page_code == 8 || page_code == 6) { 2414 /* We're interested only in the first 3 bytes. 2415 */ 2416 if (len - offset <= 2) { 2417 sd_first_printk(KERN_ERR, sdkp, 2418 "Incomplete mode parameter " 2419 "data\n"); 2420 goto defaults; 2421 } else { 2422 modepage = page_code; 2423 goto Page_found; 2424 } 2425 } else { 2426 /* Go to the next page */ 2427 if (spf && len - offset > 3) 2428 offset += 4 + (buffer[offset+2] << 8) + 2429 buffer[offset+3]; 2430 else if (!spf && len - offset > 1) 2431 offset += 2 + buffer[offset+1]; 2432 else { 2433 sd_first_printk(KERN_ERR, sdkp, 2434 "Incomplete mode " 2435 "parameter data\n"); 2436 goto defaults; 2437 } 2438 } 2439 } 2440 2441 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n"); 2442 goto defaults; 2443 2444 Page_found: 2445 if (modepage == 8) { 2446 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 2447 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 2448 } else { 2449 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 2450 sdkp->RCD = 0; 2451 } 2452 2453 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 2454 if (sdp->broken_fua) { 2455 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n"); 2456 sdkp->DPOFUA = 0; 2457 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 2458 sd_first_printk(KERN_NOTICE, sdkp, 2459 "Uses READ/WRITE(6), disabling FUA\n"); 2460 sdkp->DPOFUA = 0; 2461 } 2462 2463 /* No cache flush allowed for write protected devices */ 2464 if (sdkp->WCE && sdkp->write_prot) 2465 sdkp->WCE = 0; 2466 2467 if (sdkp->first_scan || old_wce != sdkp->WCE || 2468 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 2469 sd_printk(KERN_NOTICE, sdkp, 2470 "Write cache: %s, read cache: %s, %s\n", 2471 sdkp->WCE ? "enabled" : "disabled", 2472 sdkp->RCD ? "disabled" : "enabled", 2473 sdkp->DPOFUA ? "supports DPO and FUA" 2474 : "doesn't support DPO or FUA"); 2475 2476 return; 2477 } 2478 2479 bad_sense: 2480 if (scsi_sense_valid(&sshdr) && 2481 sshdr.sense_key == ILLEGAL_REQUEST && 2482 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 2483 /* Invalid field in CDB */ 2484 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 2485 else 2486 sd_first_printk(KERN_ERR, sdkp, 2487 "Asking for cache data failed\n"); 2488 2489 defaults: 2490 if (sdp->wce_default_on) { 2491 sd_first_printk(KERN_NOTICE, sdkp, 2492 "Assuming drive cache: write back\n"); 2493 sdkp->WCE = 1; 2494 } else { 2495 sd_first_printk(KERN_ERR, sdkp, 2496 "Assuming drive cache: write through\n"); 2497 sdkp->WCE = 0; 2498 } 2499 sdkp->RCD = 0; 2500 sdkp->DPOFUA = 0; 2501 } 2502 2503 /* 2504 * The ATO bit indicates whether the DIF application tag is available 2505 * for use by the operating system. 2506 */ 2507 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 2508 { 2509 int res, offset; 2510 struct scsi_device *sdp = sdkp->device; 2511 struct scsi_mode_data data; 2512 struct scsi_sense_hdr sshdr; 2513 2514 if (sdp->type != TYPE_DISK) 2515 return; 2516 2517 if (sdkp->protection_type == 0) 2518 return; 2519 2520 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 2521 SD_MAX_RETRIES, &data, &sshdr); 2522 2523 if (!scsi_status_is_good(res) || !data.header_length || 2524 data.length < 6) { 2525 sd_first_printk(KERN_WARNING, sdkp, 2526 "getting Control mode page failed, assume no ATO\n"); 2527 2528 if (scsi_sense_valid(&sshdr)) 2529 sd_print_sense_hdr(sdkp, &sshdr); 2530 2531 return; 2532 } 2533 2534 offset = data.header_length + data.block_descriptor_length; 2535 2536 if ((buffer[offset] & 0x3f) != 0x0a) { 2537 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2538 return; 2539 } 2540 2541 if ((buffer[offset + 5] & 0x80) == 0) 2542 return; 2543 2544 sdkp->ATO = 1; 2545 2546 return; 2547 } 2548 2549 /** 2550 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2551 * @disk: disk to query 2552 */ 2553 static void sd_read_block_limits(struct scsi_disk *sdkp) 2554 { 2555 unsigned int sector_sz = sdkp->device->sector_size; 2556 const int vpd_len = 64; 2557 u32 max_xfer_length; 2558 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2559 2560 if (!buffer || 2561 /* Block Limits VPD */ 2562 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2563 goto out; 2564 2565 max_xfer_length = get_unaligned_be32(&buffer[8]); 2566 if (max_xfer_length) 2567 sdkp->max_xfer_blocks = max_xfer_length; 2568 2569 blk_queue_io_min(sdkp->disk->queue, 2570 get_unaligned_be16(&buffer[6]) * sector_sz); 2571 blk_queue_io_opt(sdkp->disk->queue, 2572 get_unaligned_be32(&buffer[12]) * sector_sz); 2573 2574 if (buffer[3] == 0x3c) { 2575 unsigned int lba_count, desc_count; 2576 2577 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]); 2578 2579 if (!sdkp->lbpme) 2580 goto out; 2581 2582 lba_count = get_unaligned_be32(&buffer[20]); 2583 desc_count = get_unaligned_be32(&buffer[24]); 2584 2585 if (lba_count && desc_count) 2586 sdkp->max_unmap_blocks = lba_count; 2587 2588 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); 2589 2590 if (buffer[32] & 0x80) 2591 sdkp->unmap_alignment = 2592 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2593 2594 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ 2595 2596 if (sdkp->max_unmap_blocks) 2597 sd_config_discard(sdkp, SD_LBP_UNMAP); 2598 else 2599 sd_config_discard(sdkp, SD_LBP_WS16); 2600 2601 } else { /* LBP VPD page tells us what to use */ 2602 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz) 2603 sd_config_discard(sdkp, SD_LBP_UNMAP); 2604 else if (sdkp->lbpws) 2605 sd_config_discard(sdkp, SD_LBP_WS16); 2606 else if (sdkp->lbpws10) 2607 sd_config_discard(sdkp, SD_LBP_WS10); 2608 else if (sdkp->lbpu && sdkp->max_unmap_blocks) 2609 sd_config_discard(sdkp, SD_LBP_UNMAP); 2610 else 2611 sd_config_discard(sdkp, SD_LBP_DISABLE); 2612 } 2613 } 2614 2615 out: 2616 kfree(buffer); 2617 } 2618 2619 /** 2620 * sd_read_block_characteristics - Query block dev. characteristics 2621 * @disk: disk to query 2622 */ 2623 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2624 { 2625 unsigned char *buffer; 2626 u16 rot; 2627 const int vpd_len = 64; 2628 2629 buffer = kmalloc(vpd_len, GFP_KERNEL); 2630 2631 if (!buffer || 2632 /* Block Device Characteristics VPD */ 2633 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2634 goto out; 2635 2636 rot = get_unaligned_be16(&buffer[4]); 2637 2638 if (rot == 1) { 2639 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2640 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue); 2641 } 2642 2643 out: 2644 kfree(buffer); 2645 } 2646 2647 /** 2648 * sd_read_block_provisioning - Query provisioning VPD page 2649 * @disk: disk to query 2650 */ 2651 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 2652 { 2653 unsigned char *buffer; 2654 const int vpd_len = 8; 2655 2656 if (sdkp->lbpme == 0) 2657 return; 2658 2659 buffer = kmalloc(vpd_len, GFP_KERNEL); 2660 2661 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) 2662 goto out; 2663 2664 sdkp->lbpvpd = 1; 2665 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ 2666 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ 2667 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ 2668 2669 out: 2670 kfree(buffer); 2671 } 2672 2673 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) 2674 { 2675 struct scsi_device *sdev = sdkp->device; 2676 2677 if (sdev->host->no_write_same) { 2678 sdev->no_write_same = 1; 2679 2680 return; 2681 } 2682 2683 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) { 2684 /* too large values might cause issues with arcmsr */ 2685 int vpd_buf_len = 64; 2686 2687 sdev->no_report_opcodes = 1; 2688 2689 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION 2690 * CODES is unsupported and the device has an ATA 2691 * Information VPD page (SAT). 2692 */ 2693 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len)) 2694 sdev->no_write_same = 1; 2695 } 2696 2697 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1) 2698 sdkp->ws16 = 1; 2699 2700 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1) 2701 sdkp->ws10 = 1; 2702 } 2703 2704 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2705 { 2706 /* Attempt VPD inquiry if the device blacklist explicitly calls 2707 * for it. 2708 */ 2709 if (sdp->try_vpd_pages) 2710 return 1; 2711 /* 2712 * Although VPD inquiries can go to SCSI-2 type devices, 2713 * some USB ones crash on receiving them, and the pages 2714 * we currently ask for are for SPC-3 and beyond 2715 */ 2716 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages) 2717 return 1; 2718 return 0; 2719 } 2720 2721 /** 2722 * sd_revalidate_disk - called the first time a new disk is seen, 2723 * performs disk spin up, read_capacity, etc. 2724 * @disk: struct gendisk we care about 2725 **/ 2726 static int sd_revalidate_disk(struct gendisk *disk) 2727 { 2728 struct scsi_disk *sdkp = scsi_disk(disk); 2729 struct scsi_device *sdp = sdkp->device; 2730 unsigned char *buffer; 2731 unsigned int max_xfer; 2732 2733 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2734 "sd_revalidate_disk\n")); 2735 2736 /* 2737 * If the device is offline, don't try and read capacity or any 2738 * of the other niceties. 2739 */ 2740 if (!scsi_device_online(sdp)) 2741 goto out; 2742 2743 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2744 if (!buffer) { 2745 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2746 "allocation failure.\n"); 2747 goto out; 2748 } 2749 2750 sd_spinup_disk(sdkp); 2751 2752 /* 2753 * Without media there is no reason to ask; moreover, some devices 2754 * react badly if we do. 2755 */ 2756 if (sdkp->media_present) { 2757 sd_read_capacity(sdkp, buffer); 2758 2759 if (sd_try_extended_inquiry(sdp)) { 2760 sd_read_block_provisioning(sdkp); 2761 sd_read_block_limits(sdkp); 2762 sd_read_block_characteristics(sdkp); 2763 } 2764 2765 sd_read_write_protect_flag(sdkp, buffer); 2766 sd_read_cache_type(sdkp, buffer); 2767 sd_read_app_tag_own(sdkp, buffer); 2768 sd_read_write_same(sdkp, buffer); 2769 } 2770 2771 sdkp->first_scan = 0; 2772 2773 /* 2774 * We now have all cache related info, determine how we deal 2775 * with flush requests. 2776 */ 2777 sd_set_flush_flag(sdkp); 2778 2779 max_xfer = sdkp->max_xfer_blocks; 2780 max_xfer <<= ilog2(sdp->sector_size) - 9; 2781 2782 max_xfer = min_not_zero(queue_max_hw_sectors(sdkp->disk->queue), 2783 max_xfer); 2784 blk_queue_max_hw_sectors(sdkp->disk->queue, max_xfer); 2785 set_capacity(disk, sdkp->capacity); 2786 sd_config_write_same(sdkp); 2787 kfree(buffer); 2788 2789 out: 2790 return 0; 2791 } 2792 2793 /** 2794 * sd_unlock_native_capacity - unlock native capacity 2795 * @disk: struct gendisk to set capacity for 2796 * 2797 * Block layer calls this function if it detects that partitions 2798 * on @disk reach beyond the end of the device. If the SCSI host 2799 * implements ->unlock_native_capacity() method, it's invoked to 2800 * give it a chance to adjust the device capacity. 2801 * 2802 * CONTEXT: 2803 * Defined by block layer. Might sleep. 2804 */ 2805 static void sd_unlock_native_capacity(struct gendisk *disk) 2806 { 2807 struct scsi_device *sdev = scsi_disk(disk)->device; 2808 2809 if (sdev->host->hostt->unlock_native_capacity) 2810 sdev->host->hostt->unlock_native_capacity(sdev); 2811 } 2812 2813 /** 2814 * sd_format_disk_name - format disk name 2815 * @prefix: name prefix - ie. "sd" for SCSI disks 2816 * @index: index of the disk to format name for 2817 * @buf: output buffer 2818 * @buflen: length of the output buffer 2819 * 2820 * SCSI disk names starts at sda. The 26th device is sdz and the 2821 * 27th is sdaa. The last one for two lettered suffix is sdzz 2822 * which is followed by sdaaa. 2823 * 2824 * This is basically 26 base counting with one extra 'nil' entry 2825 * at the beginning from the second digit on and can be 2826 * determined using similar method as 26 base conversion with the 2827 * index shifted -1 after each digit is computed. 2828 * 2829 * CONTEXT: 2830 * Don't care. 2831 * 2832 * RETURNS: 2833 * 0 on success, -errno on failure. 2834 */ 2835 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2836 { 2837 const int base = 'z' - 'a' + 1; 2838 char *begin = buf + strlen(prefix); 2839 char *end = buf + buflen; 2840 char *p; 2841 int unit; 2842 2843 p = end - 1; 2844 *p = '\0'; 2845 unit = base; 2846 do { 2847 if (p == begin) 2848 return -EINVAL; 2849 *--p = 'a' + (index % unit); 2850 index = (index / unit) - 1; 2851 } while (index >= 0); 2852 2853 memmove(begin, p, end - p); 2854 memcpy(buf, prefix, strlen(prefix)); 2855 2856 return 0; 2857 } 2858 2859 /* 2860 * The asynchronous part of sd_probe 2861 */ 2862 static void sd_probe_async(void *data, async_cookie_t cookie) 2863 { 2864 struct scsi_disk *sdkp = data; 2865 struct scsi_device *sdp; 2866 struct gendisk *gd; 2867 u32 index; 2868 struct device *dev; 2869 2870 sdp = sdkp->device; 2871 gd = sdkp->disk; 2872 index = sdkp->index; 2873 dev = &sdp->sdev_gendev; 2874 2875 gd->major = sd_major((index & 0xf0) >> 4); 2876 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2877 gd->minors = SD_MINORS; 2878 2879 gd->fops = &sd_fops; 2880 gd->private_data = &sdkp->driver; 2881 gd->queue = sdkp->device->request_queue; 2882 2883 /* defaults, until the device tells us otherwise */ 2884 sdp->sector_size = 512; 2885 sdkp->capacity = 0; 2886 sdkp->media_present = 1; 2887 sdkp->write_prot = 0; 2888 sdkp->cache_override = 0; 2889 sdkp->WCE = 0; 2890 sdkp->RCD = 0; 2891 sdkp->ATO = 0; 2892 sdkp->first_scan = 1; 2893 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; 2894 2895 sd_revalidate_disk(gd); 2896 2897 gd->driverfs_dev = &sdp->sdev_gendev; 2898 gd->flags = GENHD_FL_EXT_DEVT; 2899 if (sdp->removable) { 2900 gd->flags |= GENHD_FL_REMOVABLE; 2901 gd->events |= DISK_EVENT_MEDIA_CHANGE; 2902 } 2903 2904 blk_pm_runtime_init(sdp->request_queue, dev); 2905 add_disk(gd); 2906 if (sdkp->capacity) 2907 sd_dif_config_host(sdkp); 2908 2909 sd_revalidate_disk(gd); 2910 2911 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2912 sdp->removable ? "removable " : ""); 2913 scsi_autopm_put_device(sdp); 2914 put_device(&sdkp->dev); 2915 } 2916 2917 /** 2918 * sd_probe - called during driver initialization and whenever a 2919 * new scsi device is attached to the system. It is called once 2920 * for each scsi device (not just disks) present. 2921 * @dev: pointer to device object 2922 * 2923 * Returns 0 if successful (or not interested in this scsi device 2924 * (e.g. scanner)); 1 when there is an error. 2925 * 2926 * Note: this function is invoked from the scsi mid-level. 2927 * This function sets up the mapping between a given 2928 * <host,channel,id,lun> (found in sdp) and new device name 2929 * (e.g. /dev/sda). More precisely it is the block device major 2930 * and minor number that is chosen here. 2931 * 2932 * Assume sd_probe is not re-entrant (for time being) 2933 * Also think about sd_probe() and sd_remove() running coincidentally. 2934 **/ 2935 static int sd_probe(struct device *dev) 2936 { 2937 struct scsi_device *sdp = to_scsi_device(dev); 2938 struct scsi_disk *sdkp; 2939 struct gendisk *gd; 2940 int index; 2941 int error; 2942 2943 scsi_autopm_get_device(sdp); 2944 error = -ENODEV; 2945 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2946 goto out; 2947 2948 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2949 "sd_probe\n")); 2950 2951 error = -ENOMEM; 2952 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2953 if (!sdkp) 2954 goto out; 2955 2956 gd = alloc_disk(SD_MINORS); 2957 if (!gd) 2958 goto out_free; 2959 2960 do { 2961 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2962 goto out_put; 2963 2964 spin_lock(&sd_index_lock); 2965 error = ida_get_new(&sd_index_ida, &index); 2966 spin_unlock(&sd_index_lock); 2967 } while (error == -EAGAIN); 2968 2969 if (error) { 2970 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); 2971 goto out_put; 2972 } 2973 2974 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2975 if (error) { 2976 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); 2977 goto out_free_index; 2978 } 2979 2980 sdkp->device = sdp; 2981 sdkp->driver = &sd_template; 2982 sdkp->disk = gd; 2983 sdkp->index = index; 2984 atomic_set(&sdkp->openers, 0); 2985 atomic_set(&sdkp->device->ioerr_cnt, 0); 2986 2987 if (!sdp->request_queue->rq_timeout) { 2988 if (sdp->type != TYPE_MOD) 2989 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2990 else 2991 blk_queue_rq_timeout(sdp->request_queue, 2992 SD_MOD_TIMEOUT); 2993 } 2994 2995 device_initialize(&sdkp->dev); 2996 sdkp->dev.parent = dev; 2997 sdkp->dev.class = &sd_disk_class; 2998 dev_set_name(&sdkp->dev, "%s", dev_name(dev)); 2999 3000 if (device_add(&sdkp->dev)) 3001 goto out_free_index; 3002 3003 get_device(dev); 3004 dev_set_drvdata(dev, sdkp); 3005 3006 get_device(&sdkp->dev); /* prevent release before async_schedule */ 3007 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain); 3008 3009 return 0; 3010 3011 out_free_index: 3012 spin_lock(&sd_index_lock); 3013 ida_remove(&sd_index_ida, index); 3014 spin_unlock(&sd_index_lock); 3015 out_put: 3016 put_disk(gd); 3017 out_free: 3018 kfree(sdkp); 3019 out: 3020 scsi_autopm_put_device(sdp); 3021 return error; 3022 } 3023 3024 /** 3025 * sd_remove - called whenever a scsi disk (previously recognized by 3026 * sd_probe) is detached from the system. It is called (potentially 3027 * multiple times) during sd module unload. 3028 * @sdp: pointer to mid level scsi device object 3029 * 3030 * Note: this function is invoked from the scsi mid-level. 3031 * This function potentially frees up a device name (e.g. /dev/sdc) 3032 * that could be re-used by a subsequent sd_probe(). 3033 * This function is not called when the built-in sd driver is "exit-ed". 3034 **/ 3035 static int sd_remove(struct device *dev) 3036 { 3037 struct scsi_disk *sdkp; 3038 dev_t devt; 3039 3040 sdkp = dev_get_drvdata(dev); 3041 devt = disk_devt(sdkp->disk); 3042 scsi_autopm_get_device(sdkp->device); 3043 3044 async_synchronize_full_domain(&scsi_sd_pm_domain); 3045 async_synchronize_full_domain(&scsi_sd_probe_domain); 3046 device_del(&sdkp->dev); 3047 del_gendisk(sdkp->disk); 3048 sd_shutdown(dev); 3049 3050 blk_register_region(devt, SD_MINORS, NULL, 3051 sd_default_probe, NULL, NULL); 3052 3053 mutex_lock(&sd_ref_mutex); 3054 dev_set_drvdata(dev, NULL); 3055 put_device(&sdkp->dev); 3056 mutex_unlock(&sd_ref_mutex); 3057 3058 return 0; 3059 } 3060 3061 /** 3062 * scsi_disk_release - Called to free the scsi_disk structure 3063 * @dev: pointer to embedded class device 3064 * 3065 * sd_ref_mutex must be held entering this routine. Because it is 3066 * called on last put, you should always use the scsi_disk_get() 3067 * scsi_disk_put() helpers which manipulate the semaphore directly 3068 * and never do a direct put_device. 3069 **/ 3070 static void scsi_disk_release(struct device *dev) 3071 { 3072 struct scsi_disk *sdkp = to_scsi_disk(dev); 3073 struct gendisk *disk = sdkp->disk; 3074 3075 spin_lock(&sd_index_lock); 3076 ida_remove(&sd_index_ida, sdkp->index); 3077 spin_unlock(&sd_index_lock); 3078 3079 blk_integrity_unregister(disk); 3080 disk->private_data = NULL; 3081 put_disk(disk); 3082 put_device(&sdkp->device->sdev_gendev); 3083 3084 kfree(sdkp); 3085 } 3086 3087 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 3088 { 3089 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 3090 struct scsi_sense_hdr sshdr; 3091 struct scsi_device *sdp = sdkp->device; 3092 int res; 3093 3094 if (start) 3095 cmd[4] |= 1; /* START */ 3096 3097 if (sdp->start_stop_pwr_cond) 3098 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 3099 3100 if (!scsi_device_online(sdp)) 3101 return -ENODEV; 3102 3103 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 3104 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM); 3105 if (res) { 3106 sd_print_result(sdkp, "Start/Stop Unit failed", res); 3107 if (driver_byte(res) & DRIVER_SENSE) 3108 sd_print_sense_hdr(sdkp, &sshdr); 3109 if (scsi_sense_valid(&sshdr) && 3110 /* 0x3a is medium not present */ 3111 sshdr.asc == 0x3a) 3112 res = 0; 3113 } 3114 3115 /* SCSI error codes must not go to the generic layer */ 3116 if (res) 3117 return -EIO; 3118 3119 return 0; 3120 } 3121 3122 /* 3123 * Send a SYNCHRONIZE CACHE instruction down to the device through 3124 * the normal SCSI command structure. Wait for the command to 3125 * complete. 3126 */ 3127 static void sd_shutdown(struct device *dev) 3128 { 3129 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3130 3131 if (!sdkp) 3132 return; /* this can happen */ 3133 3134 if (pm_runtime_suspended(dev)) 3135 return; 3136 3137 if (sdkp->WCE && sdkp->media_present) { 3138 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3139 sd_sync_cache(sdkp); 3140 } 3141 3142 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 3143 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3144 sd_start_stop_device(sdkp, 0); 3145 } 3146 } 3147 3148 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors) 3149 { 3150 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3151 int ret = 0; 3152 3153 if (!sdkp) 3154 return 0; /* this can happen */ 3155 3156 if (sdkp->WCE && sdkp->media_present) { 3157 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 3158 ret = sd_sync_cache(sdkp); 3159 if (ret) { 3160 /* ignore OFFLINE device */ 3161 if (ret == -ENODEV) 3162 ret = 0; 3163 goto done; 3164 } 3165 } 3166 3167 if (sdkp->device->manage_start_stop) { 3168 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 3169 /* an error is not worth aborting a system sleep */ 3170 ret = sd_start_stop_device(sdkp, 0); 3171 if (ignore_stop_errors) 3172 ret = 0; 3173 } 3174 3175 done: 3176 return ret; 3177 } 3178 3179 static int sd_suspend_system(struct device *dev) 3180 { 3181 return sd_suspend_common(dev, true); 3182 } 3183 3184 static int sd_suspend_runtime(struct device *dev) 3185 { 3186 return sd_suspend_common(dev, false); 3187 } 3188 3189 static int sd_resume(struct device *dev) 3190 { 3191 struct scsi_disk *sdkp = dev_get_drvdata(dev); 3192 3193 if (!sdkp->device->manage_start_stop) 3194 return 0; 3195 3196 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 3197 return sd_start_stop_device(sdkp, 1); 3198 } 3199 3200 /** 3201 * init_sd - entry point for this driver (both when built in or when 3202 * a module). 3203 * 3204 * Note: this function registers this driver with the scsi mid-level. 3205 **/ 3206 static int __init init_sd(void) 3207 { 3208 int majors = 0, i, err; 3209 3210 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 3211 3212 for (i = 0; i < SD_MAJORS; i++) { 3213 if (register_blkdev(sd_major(i), "sd") != 0) 3214 continue; 3215 majors++; 3216 blk_register_region(sd_major(i), SD_MINORS, NULL, 3217 sd_default_probe, NULL, NULL); 3218 } 3219 3220 if (!majors) 3221 return -ENODEV; 3222 3223 err = class_register(&sd_disk_class); 3224 if (err) 3225 goto err_out; 3226 3227 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 3228 0, 0, NULL); 3229 if (!sd_cdb_cache) { 3230 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 3231 err = -ENOMEM; 3232 goto err_out_class; 3233 } 3234 3235 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 3236 if (!sd_cdb_pool) { 3237 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 3238 err = -ENOMEM; 3239 goto err_out_cache; 3240 } 3241 3242 err = scsi_register_driver(&sd_template.gendrv); 3243 if (err) 3244 goto err_out_driver; 3245 3246 return 0; 3247 3248 err_out_driver: 3249 mempool_destroy(sd_cdb_pool); 3250 3251 err_out_cache: 3252 kmem_cache_destroy(sd_cdb_cache); 3253 3254 err_out_class: 3255 class_unregister(&sd_disk_class); 3256 err_out: 3257 for (i = 0; i < SD_MAJORS; i++) 3258 unregister_blkdev(sd_major(i), "sd"); 3259 return err; 3260 } 3261 3262 /** 3263 * exit_sd - exit point for this driver (when it is a module). 3264 * 3265 * Note: this function unregisters this driver from the scsi mid-level. 3266 **/ 3267 static void __exit exit_sd(void) 3268 { 3269 int i; 3270 3271 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 3272 3273 scsi_unregister_driver(&sd_template.gendrv); 3274 mempool_destroy(sd_cdb_pool); 3275 kmem_cache_destroy(sd_cdb_cache); 3276 3277 class_unregister(&sd_disk_class); 3278 3279 for (i = 0; i < SD_MAJORS; i++) { 3280 blk_unregister_region(sd_major(i), SD_MINORS); 3281 unregister_blkdev(sd_major(i), "sd"); 3282 } 3283 } 3284 3285 module_init(init_sd); 3286 module_exit(exit_sd); 3287 3288 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 3289 struct scsi_sense_hdr *sshdr) 3290 { 3291 scsi_print_sense_hdr(sdkp->device, 3292 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr); 3293 } 3294 3295 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg, 3296 int result) 3297 { 3298 const char *hb_string = scsi_hostbyte_string(result); 3299 const char *db_string = scsi_driverbyte_string(result); 3300 3301 if (hb_string || db_string) 3302 sd_printk(KERN_INFO, sdkp, 3303 "%s: Result: hostbyte=%s driverbyte=%s\n", msg, 3304 hb_string ? hb_string : "invalid", 3305 db_string ? db_string : "invalid"); 3306 else 3307 sd_printk(KERN_INFO, sdkp, 3308 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n", 3309 msg, host_byte(result), driver_byte(result)); 3310 } 3311 3312