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