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