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