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