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_prep_fn - 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_prep_fn: 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 retval = scsi_autopm_get_device(sdp); 1216 if (retval) 1217 goto out; 1218 1219 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 1220 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1221 sshdr); 1222 scsi_autopm_put_device(sdp); 1223 } 1224 1225 /* failed to execute TUR, assume media not present */ 1226 if (host_byte(retval)) { 1227 set_media_not_present(sdkp); 1228 goto out; 1229 } 1230 1231 if (media_not_present(sdkp, sshdr)) 1232 goto out; 1233 1234 /* 1235 * For removable scsi disk we have to recognise the presence 1236 * of a disk in the drive. 1237 */ 1238 if (!sdkp->media_present) 1239 sdp->changed = 1; 1240 sdkp->media_present = 1; 1241 out: 1242 /* 1243 * sdp->changed is set under the following conditions: 1244 * 1245 * Medium present state has changed in either direction. 1246 * Device has indicated UNIT_ATTENTION. 1247 */ 1248 kfree(sshdr); 1249 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1250 sdp->changed = 0; 1251 return retval; 1252 } 1253 1254 static int sd_sync_cache(struct scsi_disk *sdkp) 1255 { 1256 int retries, res; 1257 struct scsi_device *sdp = sdkp->device; 1258 struct scsi_sense_hdr sshdr; 1259 1260 if (!scsi_device_online(sdp)) 1261 return -ENODEV; 1262 1263 1264 for (retries = 3; retries > 0; --retries) { 1265 unsigned char cmd[10] = { 0 }; 1266 1267 cmd[0] = SYNCHRONIZE_CACHE; 1268 /* 1269 * Leave the rest of the command zero to indicate 1270 * flush everything. 1271 */ 1272 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 1273 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL); 1274 if (res == 0) 1275 break; 1276 } 1277 1278 if (res) { 1279 sd_print_result(sdkp, res); 1280 if (driver_byte(res) & DRIVER_SENSE) 1281 sd_print_sense_hdr(sdkp, &sshdr); 1282 } 1283 1284 if (res) 1285 return -EIO; 1286 return 0; 1287 } 1288 1289 static void sd_rescan(struct device *dev) 1290 { 1291 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1292 1293 if (sdkp) { 1294 revalidate_disk(sdkp->disk); 1295 scsi_disk_put(sdkp); 1296 } 1297 } 1298 1299 1300 #ifdef CONFIG_COMPAT 1301 /* 1302 * This gets directly called from VFS. When the ioctl 1303 * is not recognized we go back to the other translation paths. 1304 */ 1305 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1306 unsigned int cmd, unsigned long arg) 1307 { 1308 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1309 int ret; 1310 1311 ret = scsi_verify_blk_ioctl(bdev, cmd); 1312 if (ret < 0) 1313 return ret; 1314 1315 /* 1316 * If we are in the middle of error recovery, don't let anyone 1317 * else try and use this device. Also, if error recovery fails, it 1318 * may try and take the device offline, in which case all further 1319 * access to the device is prohibited. 1320 */ 1321 if (!scsi_block_when_processing_errors(sdev)) 1322 return -ENODEV; 1323 1324 if (sdev->host->hostt->compat_ioctl) { 1325 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1326 1327 return ret; 1328 } 1329 1330 /* 1331 * Let the static ioctl translation table take care of it. 1332 */ 1333 return -ENOIOCTLCMD; 1334 } 1335 #endif 1336 1337 static const struct block_device_operations sd_fops = { 1338 .owner = THIS_MODULE, 1339 .open = sd_open, 1340 .release = sd_release, 1341 .ioctl = sd_ioctl, 1342 .getgeo = sd_getgeo, 1343 #ifdef CONFIG_COMPAT 1344 .compat_ioctl = sd_compat_ioctl, 1345 #endif 1346 .check_events = sd_check_events, 1347 .revalidate_disk = sd_revalidate_disk, 1348 .unlock_native_capacity = sd_unlock_native_capacity, 1349 }; 1350 1351 /** 1352 * sd_eh_action - error handling callback 1353 * @scmd: sd-issued command that has failed 1354 * @eh_cmnd: The command that was sent during error handling 1355 * @eh_cmnd_len: Length of eh_cmnd in bytes 1356 * @eh_disp: The recovery disposition suggested by the midlayer 1357 * 1358 * This function is called by the SCSI midlayer upon completion of 1359 * an error handling command (TEST UNIT READY, START STOP UNIT, 1360 * etc.) The command sent to the device by the error handler is 1361 * stored in eh_cmnd. The result of sending the eh command is 1362 * passed in eh_disp. 1363 **/ 1364 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd, 1365 int eh_cmnd_len, int eh_disp) 1366 { 1367 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); 1368 1369 if (!scsi_device_online(scmd->device) || 1370 !scsi_medium_access_command(scmd)) 1371 return eh_disp; 1372 1373 /* 1374 * The device has timed out executing a medium access command. 1375 * However, the TEST UNIT READY command sent during error 1376 * handling completed successfully. Either the device is in the 1377 * process of recovering or has it suffered an internal failure 1378 * that prevents access to the storage medium. 1379 */ 1380 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS && 1381 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY) 1382 sdkp->medium_access_timed_out++; 1383 1384 /* 1385 * If the device keeps failing read/write commands but TEST UNIT 1386 * READY always completes successfully we assume that medium 1387 * access is no longer possible and take the device offline. 1388 */ 1389 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { 1390 scmd_printk(KERN_ERR, scmd, 1391 "Medium access timeout failure. Offlining disk!\n"); 1392 scsi_device_set_state(scmd->device, SDEV_OFFLINE); 1393 1394 return FAILED; 1395 } 1396 1397 return eh_disp; 1398 } 1399 1400 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1401 { 1402 u64 start_lba = blk_rq_pos(scmd->request); 1403 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1404 u64 bad_lba; 1405 int info_valid; 1406 /* 1407 * resid is optional but mostly filled in. When it's unused, 1408 * its value is zero, so we assume the whole buffer transferred 1409 */ 1410 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 1411 unsigned int good_bytes; 1412 1413 if (scmd->request->cmd_type != REQ_TYPE_FS) 1414 return 0; 1415 1416 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1417 SCSI_SENSE_BUFFERSIZE, 1418 &bad_lba); 1419 if (!info_valid) 1420 return 0; 1421 1422 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1423 return 0; 1424 1425 if (scmd->device->sector_size < 512) { 1426 /* only legitimate sector_size here is 256 */ 1427 start_lba <<= 1; 1428 end_lba <<= 1; 1429 } else { 1430 /* be careful ... don't want any overflows */ 1431 u64 factor = scmd->device->sector_size / 512; 1432 do_div(start_lba, factor); 1433 do_div(end_lba, factor); 1434 } 1435 1436 /* The bad lba was reported incorrectly, we have no idea where 1437 * the error is. 1438 */ 1439 if (bad_lba < start_lba || bad_lba >= end_lba) 1440 return 0; 1441 1442 /* This computation should always be done in terms of 1443 * the resolution of the device's medium. 1444 */ 1445 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; 1446 return min(good_bytes, transferred); 1447 } 1448 1449 /** 1450 * sd_done - bottom half handler: called when the lower level 1451 * driver has completed (successfully or otherwise) a scsi command. 1452 * @SCpnt: mid-level's per command structure. 1453 * 1454 * Note: potentially run from within an ISR. Must not block. 1455 **/ 1456 static int sd_done(struct scsi_cmnd *SCpnt) 1457 { 1458 int result = SCpnt->result; 1459 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1460 struct scsi_sense_hdr sshdr; 1461 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1462 int sense_valid = 0; 1463 int sense_deferred = 0; 1464 unsigned char op = SCpnt->cmnd[0]; 1465 1466 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result) 1467 scsi_set_resid(SCpnt, 0); 1468 1469 if (result) { 1470 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1471 if (sense_valid) 1472 sense_deferred = scsi_sense_is_deferred(&sshdr); 1473 } 1474 #ifdef CONFIG_SCSI_LOGGING 1475 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1476 if (sense_valid) { 1477 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1478 "sd_done: sb[respc,sk,asc," 1479 "ascq]=%x,%x,%x,%x\n", 1480 sshdr.response_code, 1481 sshdr.sense_key, sshdr.asc, 1482 sshdr.ascq)); 1483 } 1484 #endif 1485 if (driver_byte(result) != DRIVER_SENSE && 1486 (!sense_valid || sense_deferred)) 1487 goto out; 1488 1489 sdkp->medium_access_timed_out = 0; 1490 1491 switch (sshdr.sense_key) { 1492 case HARDWARE_ERROR: 1493 case MEDIUM_ERROR: 1494 good_bytes = sd_completed_bytes(SCpnt); 1495 break; 1496 case RECOVERED_ERROR: 1497 good_bytes = scsi_bufflen(SCpnt); 1498 break; 1499 case NO_SENSE: 1500 /* This indicates a false check condition, so ignore it. An 1501 * unknown amount of data was transferred so treat it as an 1502 * error. 1503 */ 1504 scsi_print_sense("sd", SCpnt); 1505 SCpnt->result = 0; 1506 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1507 break; 1508 case ABORTED_COMMAND: 1509 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 1510 good_bytes = sd_completed_bytes(SCpnt); 1511 break; 1512 case ILLEGAL_REQUEST: 1513 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */ 1514 good_bytes = sd_completed_bytes(SCpnt); 1515 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ 1516 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1517 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME)) 1518 sd_config_discard(sdkp, SD_LBP_DISABLE); 1519 break; 1520 default: 1521 break; 1522 } 1523 out: 1524 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1525 sd_dif_complete(SCpnt, good_bytes); 1526 1527 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) 1528 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { 1529 1530 /* We have to print a failed command here as the 1531 * extended CDB gets freed before scsi_io_completion() 1532 * is called. 1533 */ 1534 if (result) 1535 scsi_print_command(SCpnt); 1536 1537 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1538 SCpnt->cmnd = NULL; 1539 SCpnt->cmd_len = 0; 1540 } 1541 1542 return good_bytes; 1543 } 1544 1545 /* 1546 * spinup disk - called only in sd_revalidate_disk() 1547 */ 1548 static void 1549 sd_spinup_disk(struct scsi_disk *sdkp) 1550 { 1551 unsigned char cmd[10]; 1552 unsigned long spintime_expire = 0; 1553 int retries, spintime; 1554 unsigned int the_result; 1555 struct scsi_sense_hdr sshdr; 1556 int sense_valid = 0; 1557 1558 spintime = 0; 1559 1560 /* Spin up drives, as required. Only do this at boot time */ 1561 /* Spinup needs to be done for module loads too. */ 1562 do { 1563 retries = 0; 1564 1565 do { 1566 cmd[0] = TEST_UNIT_READY; 1567 memset((void *) &cmd[1], 0, 9); 1568 1569 the_result = scsi_execute_req(sdkp->device, cmd, 1570 DMA_NONE, NULL, 0, 1571 &sshdr, SD_TIMEOUT, 1572 SD_MAX_RETRIES, NULL); 1573 1574 /* 1575 * If the drive has indicated to us that it 1576 * doesn't have any media in it, don't bother 1577 * with any more polling. 1578 */ 1579 if (media_not_present(sdkp, &sshdr)) 1580 return; 1581 1582 if (the_result) 1583 sense_valid = scsi_sense_valid(&sshdr); 1584 retries++; 1585 } while (retries < 3 && 1586 (!scsi_status_is_good(the_result) || 1587 ((driver_byte(the_result) & DRIVER_SENSE) && 1588 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1589 1590 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1591 /* no sense, TUR either succeeded or failed 1592 * with a status error */ 1593 if(!spintime && !scsi_status_is_good(the_result)) { 1594 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1595 sd_print_result(sdkp, the_result); 1596 } 1597 break; 1598 } 1599 1600 /* 1601 * The device does not want the automatic start to be issued. 1602 */ 1603 if (sdkp->device->no_start_on_add) 1604 break; 1605 1606 if (sense_valid && sshdr.sense_key == NOT_READY) { 1607 if (sshdr.asc == 4 && sshdr.ascq == 3) 1608 break; /* manual intervention required */ 1609 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1610 break; /* standby */ 1611 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1612 break; /* unavailable */ 1613 /* 1614 * Issue command to spin up drive when not ready 1615 */ 1616 if (!spintime) { 1617 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1618 cmd[0] = START_STOP; 1619 cmd[1] = 1; /* Return immediately */ 1620 memset((void *) &cmd[2], 0, 8); 1621 cmd[4] = 1; /* Start spin cycle */ 1622 if (sdkp->device->start_stop_pwr_cond) 1623 cmd[4] |= 1 << 4; 1624 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1625 NULL, 0, &sshdr, 1626 SD_TIMEOUT, SD_MAX_RETRIES, 1627 NULL); 1628 spintime_expire = jiffies + 100 * HZ; 1629 spintime = 1; 1630 } 1631 /* Wait 1 second for next try */ 1632 msleep(1000); 1633 printk("."); 1634 1635 /* 1636 * Wait for USB flash devices with slow firmware. 1637 * Yes, this sense key/ASC combination shouldn't 1638 * occur here. It's characteristic of these devices. 1639 */ 1640 } else if (sense_valid && 1641 sshdr.sense_key == UNIT_ATTENTION && 1642 sshdr.asc == 0x28) { 1643 if (!spintime) { 1644 spintime_expire = jiffies + 5 * HZ; 1645 spintime = 1; 1646 } 1647 /* Wait 1 second for next try */ 1648 msleep(1000); 1649 } else { 1650 /* we don't understand the sense code, so it's 1651 * probably pointless to loop */ 1652 if(!spintime) { 1653 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1654 sd_print_sense_hdr(sdkp, &sshdr); 1655 } 1656 break; 1657 } 1658 1659 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1660 1661 if (spintime) { 1662 if (scsi_status_is_good(the_result)) 1663 printk("ready\n"); 1664 else 1665 printk("not responding...\n"); 1666 } 1667 } 1668 1669 1670 /* 1671 * Determine whether disk supports Data Integrity Field. 1672 */ 1673 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1674 { 1675 struct scsi_device *sdp = sdkp->device; 1676 u8 type; 1677 1678 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1679 return; 1680 1681 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1682 1683 if (type == sdkp->protection_type || !sdkp->first_scan) 1684 return; 1685 1686 sdkp->protection_type = type; 1687 1688 if (type > SD_DIF_TYPE3_PROTECTION) { 1689 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \ 1690 "protection type %u. Disabling disk!\n", type); 1691 sdkp->capacity = 0; 1692 return; 1693 } 1694 1695 if (scsi_host_dif_capable(sdp->host, type)) 1696 sd_printk(KERN_NOTICE, sdkp, 1697 "Enabling DIF Type %u protection\n", type); 1698 else 1699 sd_printk(KERN_NOTICE, sdkp, 1700 "Disabling DIF Type %u protection\n", type); 1701 } 1702 1703 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1704 struct scsi_sense_hdr *sshdr, int sense_valid, 1705 int the_result) 1706 { 1707 sd_print_result(sdkp, the_result); 1708 if (driver_byte(the_result) & DRIVER_SENSE) 1709 sd_print_sense_hdr(sdkp, sshdr); 1710 else 1711 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1712 1713 /* 1714 * Set dirty bit for removable devices if not ready - 1715 * sometimes drives will not report this properly. 1716 */ 1717 if (sdp->removable && 1718 sense_valid && sshdr->sense_key == NOT_READY) 1719 set_media_not_present(sdkp); 1720 1721 /* 1722 * We used to set media_present to 0 here to indicate no media 1723 * in the drive, but some drives fail read capacity even with 1724 * media present, so we can't do that. 1725 */ 1726 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1727 } 1728 1729 #define RC16_LEN 32 1730 #if RC16_LEN > SD_BUF_SIZE 1731 #error RC16_LEN must not be more than SD_BUF_SIZE 1732 #endif 1733 1734 #define READ_CAPACITY_RETRIES_ON_RESET 10 1735 1736 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1737 unsigned char *buffer) 1738 { 1739 unsigned char cmd[16]; 1740 struct scsi_sense_hdr sshdr; 1741 int sense_valid = 0; 1742 int the_result; 1743 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1744 unsigned int alignment; 1745 unsigned long long lba; 1746 unsigned sector_size; 1747 1748 if (sdp->no_read_capacity_16) 1749 return -EINVAL; 1750 1751 do { 1752 memset(cmd, 0, 16); 1753 cmd[0] = SERVICE_ACTION_IN; 1754 cmd[1] = SAI_READ_CAPACITY_16; 1755 cmd[13] = RC16_LEN; 1756 memset(buffer, 0, RC16_LEN); 1757 1758 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1759 buffer, RC16_LEN, &sshdr, 1760 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1761 1762 if (media_not_present(sdkp, &sshdr)) 1763 return -ENODEV; 1764 1765 if (the_result) { 1766 sense_valid = scsi_sense_valid(&sshdr); 1767 if (sense_valid && 1768 sshdr.sense_key == ILLEGAL_REQUEST && 1769 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1770 sshdr.ascq == 0x00) 1771 /* Invalid Command Operation Code or 1772 * Invalid Field in CDB, just retry 1773 * silently with RC10 */ 1774 return -EINVAL; 1775 if (sense_valid && 1776 sshdr.sense_key == UNIT_ATTENTION && 1777 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1778 /* Device reset might occur several times, 1779 * give it one more chance */ 1780 if (--reset_retries > 0) 1781 continue; 1782 } 1783 retries--; 1784 1785 } while (the_result && retries); 1786 1787 if (the_result) { 1788 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1789 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1790 return -EINVAL; 1791 } 1792 1793 sector_size = get_unaligned_be32(&buffer[8]); 1794 lba = get_unaligned_be64(&buffer[0]); 1795 1796 sd_read_protection_type(sdkp, buffer); 1797 1798 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1799 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1800 "kernel compiled with support for large block " 1801 "devices.\n"); 1802 sdkp->capacity = 0; 1803 return -EOVERFLOW; 1804 } 1805 1806 /* Logical blocks per physical block exponent */ 1807 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 1808 1809 /* Lowest aligned logical block */ 1810 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 1811 blk_queue_alignment_offset(sdp->request_queue, alignment); 1812 if (alignment && sdkp->first_scan) 1813 sd_printk(KERN_NOTICE, sdkp, 1814 "physical block alignment offset: %u\n", alignment); 1815 1816 if (buffer[14] & 0x80) { /* LBPME */ 1817 sdkp->lbpme = 1; 1818 1819 if (buffer[14] & 0x40) /* LBPRZ */ 1820 sdkp->lbprz = 1; 1821 1822 sd_config_discard(sdkp, SD_LBP_WS16); 1823 } 1824 1825 sdkp->capacity = lba + 1; 1826 return sector_size; 1827 } 1828 1829 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 1830 unsigned char *buffer) 1831 { 1832 unsigned char cmd[16]; 1833 struct scsi_sense_hdr sshdr; 1834 int sense_valid = 0; 1835 int the_result; 1836 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1837 sector_t lba; 1838 unsigned sector_size; 1839 1840 do { 1841 cmd[0] = READ_CAPACITY; 1842 memset(&cmd[1], 0, 9); 1843 memset(buffer, 0, 8); 1844 1845 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1846 buffer, 8, &sshdr, 1847 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1848 1849 if (media_not_present(sdkp, &sshdr)) 1850 return -ENODEV; 1851 1852 if (the_result) { 1853 sense_valid = scsi_sense_valid(&sshdr); 1854 if (sense_valid && 1855 sshdr.sense_key == UNIT_ATTENTION && 1856 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1857 /* Device reset might occur several times, 1858 * give it one more chance */ 1859 if (--reset_retries > 0) 1860 continue; 1861 } 1862 retries--; 1863 1864 } while (the_result && retries); 1865 1866 if (the_result) { 1867 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1868 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1869 return -EINVAL; 1870 } 1871 1872 sector_size = get_unaligned_be32(&buffer[4]); 1873 lba = get_unaligned_be32(&buffer[0]); 1874 1875 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 1876 /* Some buggy (usb cardreader) devices return an lba of 1877 0xffffffff when the want to report a size of 0 (with 1878 which they really mean no media is present) */ 1879 sdkp->capacity = 0; 1880 sdkp->physical_block_size = sector_size; 1881 return sector_size; 1882 } 1883 1884 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 1885 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1886 "kernel compiled with support for large block " 1887 "devices.\n"); 1888 sdkp->capacity = 0; 1889 return -EOVERFLOW; 1890 } 1891 1892 sdkp->capacity = lba + 1; 1893 sdkp->physical_block_size = sector_size; 1894 return sector_size; 1895 } 1896 1897 static int sd_try_rc16_first(struct scsi_device *sdp) 1898 { 1899 if (sdp->host->max_cmd_len < 16) 1900 return 0; 1901 if (sdp->scsi_level > SCSI_SPC_2) 1902 return 1; 1903 if (scsi_device_protection(sdp)) 1904 return 1; 1905 return 0; 1906 } 1907 1908 /* 1909 * read disk capacity 1910 */ 1911 static void 1912 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1913 { 1914 int sector_size; 1915 struct scsi_device *sdp = sdkp->device; 1916 sector_t old_capacity = sdkp->capacity; 1917 1918 if (sd_try_rc16_first(sdp)) { 1919 sector_size = read_capacity_16(sdkp, sdp, buffer); 1920 if (sector_size == -EOVERFLOW) 1921 goto got_data; 1922 if (sector_size == -ENODEV) 1923 return; 1924 if (sector_size < 0) 1925 sector_size = read_capacity_10(sdkp, sdp, buffer); 1926 if (sector_size < 0) 1927 return; 1928 } else { 1929 sector_size = read_capacity_10(sdkp, sdp, buffer); 1930 if (sector_size == -EOVERFLOW) 1931 goto got_data; 1932 if (sector_size < 0) 1933 return; 1934 if ((sizeof(sdkp->capacity) > 4) && 1935 (sdkp->capacity > 0xffffffffULL)) { 1936 int old_sector_size = sector_size; 1937 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1938 "Trying to use READ CAPACITY(16).\n"); 1939 sector_size = read_capacity_16(sdkp, sdp, buffer); 1940 if (sector_size < 0) { 1941 sd_printk(KERN_NOTICE, sdkp, 1942 "Using 0xffffffff as device size\n"); 1943 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1944 sector_size = old_sector_size; 1945 goto got_data; 1946 } 1947 } 1948 } 1949 1950 /* Some devices are known to return the total number of blocks, 1951 * not the highest block number. Some devices have versions 1952 * which do this and others which do not. Some devices we might 1953 * suspect of doing this but we don't know for certain. 1954 * 1955 * If we know the reported capacity is wrong, decrement it. If 1956 * we can only guess, then assume the number of blocks is even 1957 * (usually true but not always) and err on the side of lowering 1958 * the capacity. 1959 */ 1960 if (sdp->fix_capacity || 1961 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 1962 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 1963 "from its reported value: %llu\n", 1964 (unsigned long long) sdkp->capacity); 1965 --sdkp->capacity; 1966 } 1967 1968 got_data: 1969 if (sector_size == 0) { 1970 sector_size = 512; 1971 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1972 "assuming 512.\n"); 1973 } 1974 1975 if (sector_size != 512 && 1976 sector_size != 1024 && 1977 sector_size != 2048 && 1978 sector_size != 4096 && 1979 sector_size != 256) { 1980 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1981 sector_size); 1982 /* 1983 * The user might want to re-format the drive with 1984 * a supported sectorsize. Once this happens, it 1985 * would be relatively trivial to set the thing up. 1986 * For this reason, we leave the thing in the table. 1987 */ 1988 sdkp->capacity = 0; 1989 /* 1990 * set a bogus sector size so the normal read/write 1991 * logic in the block layer will eventually refuse any 1992 * request on this device without tripping over power 1993 * of two sector size assumptions 1994 */ 1995 sector_size = 512; 1996 } 1997 blk_queue_logical_block_size(sdp->request_queue, sector_size); 1998 1999 { 2000 char cap_str_2[10], cap_str_10[10]; 2001 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 2002 2003 string_get_size(sz, STRING_UNITS_2, cap_str_2, 2004 sizeof(cap_str_2)); 2005 string_get_size(sz, STRING_UNITS_10, cap_str_10, 2006 sizeof(cap_str_10)); 2007 2008 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 2009 sd_printk(KERN_NOTICE, sdkp, 2010 "%llu %d-byte logical blocks: (%s/%s)\n", 2011 (unsigned long long)sdkp->capacity, 2012 sector_size, cap_str_10, cap_str_2); 2013 2014 if (sdkp->physical_block_size != sector_size) 2015 sd_printk(KERN_NOTICE, sdkp, 2016 "%u-byte physical blocks\n", 2017 sdkp->physical_block_size); 2018 } 2019 } 2020 2021 /* Rescale capacity to 512-byte units */ 2022 if (sector_size == 4096) 2023 sdkp->capacity <<= 3; 2024 else if (sector_size == 2048) 2025 sdkp->capacity <<= 2; 2026 else if (sector_size == 1024) 2027 sdkp->capacity <<= 1; 2028 else if (sector_size == 256) 2029 sdkp->capacity >>= 1; 2030 2031 blk_queue_physical_block_size(sdp->request_queue, 2032 sdkp->physical_block_size); 2033 sdkp->device->sector_size = sector_size; 2034 } 2035 2036 /* called with buffer of length 512 */ 2037 static inline int 2038 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 2039 unsigned char *buffer, int len, struct scsi_mode_data *data, 2040 struct scsi_sense_hdr *sshdr) 2041 { 2042 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 2043 SD_TIMEOUT, SD_MAX_RETRIES, data, 2044 sshdr); 2045 } 2046 2047 /* 2048 * read write protect setting, if possible - called only in sd_revalidate_disk() 2049 * called with buffer of length SD_BUF_SIZE 2050 */ 2051 static void 2052 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 2053 { 2054 int res; 2055 struct scsi_device *sdp = sdkp->device; 2056 struct scsi_mode_data data; 2057 int old_wp = sdkp->write_prot; 2058 2059 set_disk_ro(sdkp->disk, 0); 2060 if (sdp->skip_ms_page_3f) { 2061 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 2062 return; 2063 } 2064 2065 if (sdp->use_192_bytes_for_3f) { 2066 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 2067 } else { 2068 /* 2069 * First attempt: ask for all pages (0x3F), but only 4 bytes. 2070 * We have to start carefully: some devices hang if we ask 2071 * for more than is available. 2072 */ 2073 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 2074 2075 /* 2076 * Second attempt: ask for page 0 When only page 0 is 2077 * implemented, a request for page 3F may return Sense Key 2078 * 5: Illegal Request, Sense Code 24: Invalid field in 2079 * CDB. 2080 */ 2081 if (!scsi_status_is_good(res)) 2082 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 2083 2084 /* 2085 * Third attempt: ask 255 bytes, as we did earlier. 2086 */ 2087 if (!scsi_status_is_good(res)) 2088 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 2089 &data, NULL); 2090 } 2091 2092 if (!scsi_status_is_good(res)) { 2093 sd_printk(KERN_WARNING, sdkp, 2094 "Test WP failed, assume Write Enabled\n"); 2095 } else { 2096 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 2097 set_disk_ro(sdkp->disk, sdkp->write_prot); 2098 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 2099 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 2100 sdkp->write_prot ? "on" : "off"); 2101 sd_printk(KERN_DEBUG, sdkp, 2102 "Mode Sense: %02x %02x %02x %02x\n", 2103 buffer[0], buffer[1], buffer[2], buffer[3]); 2104 } 2105 } 2106 } 2107 2108 /* 2109 * sd_read_cache_type - called only from sd_revalidate_disk() 2110 * called with buffer of length SD_BUF_SIZE 2111 */ 2112 static void 2113 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 2114 { 2115 int len = 0, res; 2116 struct scsi_device *sdp = sdkp->device; 2117 2118 int dbd; 2119 int modepage; 2120 int first_len; 2121 struct scsi_mode_data data; 2122 struct scsi_sense_hdr sshdr; 2123 int old_wce = sdkp->WCE; 2124 int old_rcd = sdkp->RCD; 2125 int old_dpofua = sdkp->DPOFUA; 2126 2127 first_len = 4; 2128 if (sdp->skip_ms_page_8) { 2129 if (sdp->type == TYPE_RBC) 2130 goto defaults; 2131 else { 2132 if (sdp->skip_ms_page_3f) 2133 goto defaults; 2134 modepage = 0x3F; 2135 if (sdp->use_192_bytes_for_3f) 2136 first_len = 192; 2137 dbd = 0; 2138 } 2139 } else if (sdp->type == TYPE_RBC) { 2140 modepage = 6; 2141 dbd = 8; 2142 } else { 2143 modepage = 8; 2144 dbd = 0; 2145 } 2146 2147 /* cautiously ask */ 2148 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, 2149 &data, &sshdr); 2150 2151 if (!scsi_status_is_good(res)) 2152 goto bad_sense; 2153 2154 if (!data.header_length) { 2155 modepage = 6; 2156 first_len = 0; 2157 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 2158 } 2159 2160 /* that went OK, now ask for the proper length */ 2161 len = data.length; 2162 2163 /* 2164 * We're only interested in the first three bytes, actually. 2165 * But the data cache page is defined for the first 20. 2166 */ 2167 if (len < 3) 2168 goto bad_sense; 2169 else if (len > SD_BUF_SIZE) { 2170 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " 2171 "data from %d to %d bytes\n", len, SD_BUF_SIZE); 2172 len = SD_BUF_SIZE; 2173 } 2174 if (modepage == 0x3F && sdp->use_192_bytes_for_3f) 2175 len = 192; 2176 2177 /* Get the data */ 2178 if (len > first_len) 2179 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, 2180 &data, &sshdr); 2181 2182 if (scsi_status_is_good(res)) { 2183 int offset = data.header_length + data.block_descriptor_length; 2184 2185 while (offset < len) { 2186 u8 page_code = buffer[offset] & 0x3F; 2187 u8 spf = buffer[offset] & 0x40; 2188 2189 if (page_code == 8 || page_code == 6) { 2190 /* We're interested only in the first 3 bytes. 2191 */ 2192 if (len - offset <= 2) { 2193 sd_printk(KERN_ERR, sdkp, "Incomplete " 2194 "mode parameter data\n"); 2195 goto defaults; 2196 } else { 2197 modepage = page_code; 2198 goto Page_found; 2199 } 2200 } else { 2201 /* Go to the next page */ 2202 if (spf && len - offset > 3) 2203 offset += 4 + (buffer[offset+2] << 8) + 2204 buffer[offset+3]; 2205 else if (!spf && len - offset > 1) 2206 offset += 2 + buffer[offset+1]; 2207 else { 2208 sd_printk(KERN_ERR, sdkp, "Incomplete " 2209 "mode parameter data\n"); 2210 goto defaults; 2211 } 2212 } 2213 } 2214 2215 if (modepage == 0x3F) { 2216 sd_printk(KERN_ERR, sdkp, "No Caching mode page " 2217 "present\n"); 2218 goto defaults; 2219 } else if ((buffer[offset] & 0x3f) != modepage) { 2220 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 2221 goto defaults; 2222 } 2223 Page_found: 2224 if (modepage == 8) { 2225 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 2226 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 2227 } else { 2228 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 2229 sdkp->RCD = 0; 2230 } 2231 2232 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 2233 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 2234 sd_printk(KERN_NOTICE, sdkp, 2235 "Uses READ/WRITE(6), disabling FUA\n"); 2236 sdkp->DPOFUA = 0; 2237 } 2238 2239 if (sdkp->first_scan || old_wce != sdkp->WCE || 2240 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 2241 sd_printk(KERN_NOTICE, sdkp, 2242 "Write cache: %s, read cache: %s, %s\n", 2243 sdkp->WCE ? "enabled" : "disabled", 2244 sdkp->RCD ? "disabled" : "enabled", 2245 sdkp->DPOFUA ? "supports DPO and FUA" 2246 : "doesn't support DPO or FUA"); 2247 2248 return; 2249 } 2250 2251 bad_sense: 2252 if (scsi_sense_valid(&sshdr) && 2253 sshdr.sense_key == ILLEGAL_REQUEST && 2254 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 2255 /* Invalid field in CDB */ 2256 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 2257 else 2258 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 2259 2260 defaults: 2261 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 2262 sdkp->WCE = 0; 2263 sdkp->RCD = 0; 2264 sdkp->DPOFUA = 0; 2265 } 2266 2267 /* 2268 * The ATO bit indicates whether the DIF application tag is available 2269 * for use by the operating system. 2270 */ 2271 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 2272 { 2273 int res, offset; 2274 struct scsi_device *sdp = sdkp->device; 2275 struct scsi_mode_data data; 2276 struct scsi_sense_hdr sshdr; 2277 2278 if (sdp->type != TYPE_DISK) 2279 return; 2280 2281 if (sdkp->protection_type == 0) 2282 return; 2283 2284 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 2285 SD_MAX_RETRIES, &data, &sshdr); 2286 2287 if (!scsi_status_is_good(res) || !data.header_length || 2288 data.length < 6) { 2289 sd_printk(KERN_WARNING, sdkp, 2290 "getting Control mode page failed, assume no ATO\n"); 2291 2292 if (scsi_sense_valid(&sshdr)) 2293 sd_print_sense_hdr(sdkp, &sshdr); 2294 2295 return; 2296 } 2297 2298 offset = data.header_length + data.block_descriptor_length; 2299 2300 if ((buffer[offset] & 0x3f) != 0x0a) { 2301 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2302 return; 2303 } 2304 2305 if ((buffer[offset + 5] & 0x80) == 0) 2306 return; 2307 2308 sdkp->ATO = 1; 2309 2310 return; 2311 } 2312 2313 /** 2314 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2315 * @disk: disk to query 2316 */ 2317 static void sd_read_block_limits(struct scsi_disk *sdkp) 2318 { 2319 unsigned int sector_sz = sdkp->device->sector_size; 2320 const int vpd_len = 64; 2321 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2322 2323 if (!buffer || 2324 /* Block Limits VPD */ 2325 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2326 goto out; 2327 2328 blk_queue_io_min(sdkp->disk->queue, 2329 get_unaligned_be16(&buffer[6]) * sector_sz); 2330 blk_queue_io_opt(sdkp->disk->queue, 2331 get_unaligned_be32(&buffer[12]) * sector_sz); 2332 2333 if (buffer[3] == 0x3c) { 2334 unsigned int lba_count, desc_count; 2335 2336 sdkp->max_ws_blocks = 2337 (u32) min_not_zero(get_unaligned_be64(&buffer[36]), 2338 (u64)0xffffffff); 2339 2340 if (!sdkp->lbpme) 2341 goto out; 2342 2343 lba_count = get_unaligned_be32(&buffer[20]); 2344 desc_count = get_unaligned_be32(&buffer[24]); 2345 2346 if (lba_count && desc_count) 2347 sdkp->max_unmap_blocks = lba_count; 2348 2349 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); 2350 2351 if (buffer[32] & 0x80) 2352 sdkp->unmap_alignment = 2353 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2354 2355 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ 2356 2357 if (sdkp->max_unmap_blocks) 2358 sd_config_discard(sdkp, SD_LBP_UNMAP); 2359 else 2360 sd_config_discard(sdkp, SD_LBP_WS16); 2361 2362 } else { /* LBP VPD page tells us what to use */ 2363 2364 if (sdkp->lbpu && sdkp->max_unmap_blocks) 2365 sd_config_discard(sdkp, SD_LBP_UNMAP); 2366 else if (sdkp->lbpws) 2367 sd_config_discard(sdkp, SD_LBP_WS16); 2368 else if (sdkp->lbpws10) 2369 sd_config_discard(sdkp, SD_LBP_WS10); 2370 else 2371 sd_config_discard(sdkp, SD_LBP_DISABLE); 2372 } 2373 } 2374 2375 out: 2376 kfree(buffer); 2377 } 2378 2379 /** 2380 * sd_read_block_characteristics - Query block dev. characteristics 2381 * @disk: disk to query 2382 */ 2383 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2384 { 2385 unsigned char *buffer; 2386 u16 rot; 2387 const int vpd_len = 64; 2388 2389 buffer = kmalloc(vpd_len, GFP_KERNEL); 2390 2391 if (!buffer || 2392 /* Block Device Characteristics VPD */ 2393 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2394 goto out; 2395 2396 rot = get_unaligned_be16(&buffer[4]); 2397 2398 if (rot == 1) 2399 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2400 2401 out: 2402 kfree(buffer); 2403 } 2404 2405 /** 2406 * sd_read_block_provisioning - Query provisioning VPD page 2407 * @disk: disk to query 2408 */ 2409 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 2410 { 2411 unsigned char *buffer; 2412 const int vpd_len = 8; 2413 2414 if (sdkp->lbpme == 0) 2415 return; 2416 2417 buffer = kmalloc(vpd_len, GFP_KERNEL); 2418 2419 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) 2420 goto out; 2421 2422 sdkp->lbpvpd = 1; 2423 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ 2424 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ 2425 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ 2426 2427 out: 2428 kfree(buffer); 2429 } 2430 2431 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2432 { 2433 /* 2434 * Although VPD inquiries can go to SCSI-2 type devices, 2435 * some USB ones crash on receiving them, and the pages 2436 * we currently ask for are for SPC-3 and beyond 2437 */ 2438 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages) 2439 return 1; 2440 return 0; 2441 } 2442 2443 /** 2444 * sd_revalidate_disk - called the first time a new disk is seen, 2445 * performs disk spin up, read_capacity, etc. 2446 * @disk: struct gendisk we care about 2447 **/ 2448 static int sd_revalidate_disk(struct gendisk *disk) 2449 { 2450 struct scsi_disk *sdkp = scsi_disk(disk); 2451 struct scsi_device *sdp = sdkp->device; 2452 unsigned char *buffer; 2453 unsigned flush = 0; 2454 2455 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2456 "sd_revalidate_disk\n")); 2457 2458 /* 2459 * If the device is offline, don't try and read capacity or any 2460 * of the other niceties. 2461 */ 2462 if (!scsi_device_online(sdp)) 2463 goto out; 2464 2465 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2466 if (!buffer) { 2467 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2468 "allocation failure.\n"); 2469 goto out; 2470 } 2471 2472 sd_spinup_disk(sdkp); 2473 2474 /* 2475 * Without media there is no reason to ask; moreover, some devices 2476 * react badly if we do. 2477 */ 2478 if (sdkp->media_present) { 2479 sd_read_capacity(sdkp, buffer); 2480 2481 if (sd_try_extended_inquiry(sdp)) { 2482 sd_read_block_provisioning(sdkp); 2483 sd_read_block_limits(sdkp); 2484 sd_read_block_characteristics(sdkp); 2485 } 2486 2487 sd_read_write_protect_flag(sdkp, buffer); 2488 sd_read_cache_type(sdkp, buffer); 2489 sd_read_app_tag_own(sdkp, buffer); 2490 } 2491 2492 sdkp->first_scan = 0; 2493 2494 /* 2495 * We now have all cache related info, determine how we deal 2496 * with flush requests. 2497 */ 2498 if (sdkp->WCE) { 2499 flush |= REQ_FLUSH; 2500 if (sdkp->DPOFUA) 2501 flush |= REQ_FUA; 2502 } 2503 2504 blk_queue_flush(sdkp->disk->queue, flush); 2505 2506 set_capacity(disk, sdkp->capacity); 2507 kfree(buffer); 2508 2509 out: 2510 return 0; 2511 } 2512 2513 /** 2514 * sd_unlock_native_capacity - unlock native capacity 2515 * @disk: struct gendisk to set capacity for 2516 * 2517 * Block layer calls this function if it detects that partitions 2518 * on @disk reach beyond the end of the device. If the SCSI host 2519 * implements ->unlock_native_capacity() method, it's invoked to 2520 * give it a chance to adjust the device capacity. 2521 * 2522 * CONTEXT: 2523 * Defined by block layer. Might sleep. 2524 */ 2525 static void sd_unlock_native_capacity(struct gendisk *disk) 2526 { 2527 struct scsi_device *sdev = scsi_disk(disk)->device; 2528 2529 if (sdev->host->hostt->unlock_native_capacity) 2530 sdev->host->hostt->unlock_native_capacity(sdev); 2531 } 2532 2533 /** 2534 * sd_format_disk_name - format disk name 2535 * @prefix: name prefix - ie. "sd" for SCSI disks 2536 * @index: index of the disk to format name for 2537 * @buf: output buffer 2538 * @buflen: length of the output buffer 2539 * 2540 * SCSI disk names starts at sda. The 26th device is sdz and the 2541 * 27th is sdaa. The last one for two lettered suffix is sdzz 2542 * which is followed by sdaaa. 2543 * 2544 * This is basically 26 base counting with one extra 'nil' entry 2545 * at the beginning from the second digit on and can be 2546 * determined using similar method as 26 base conversion with the 2547 * index shifted -1 after each digit is computed. 2548 * 2549 * CONTEXT: 2550 * Don't care. 2551 * 2552 * RETURNS: 2553 * 0 on success, -errno on failure. 2554 */ 2555 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2556 { 2557 const int base = 'z' - 'a' + 1; 2558 char *begin = buf + strlen(prefix); 2559 char *end = buf + buflen; 2560 char *p; 2561 int unit; 2562 2563 p = end - 1; 2564 *p = '\0'; 2565 unit = base; 2566 do { 2567 if (p == begin) 2568 return -EINVAL; 2569 *--p = 'a' + (index % unit); 2570 index = (index / unit) - 1; 2571 } while (index >= 0); 2572 2573 memmove(begin, p, end - p); 2574 memcpy(buf, prefix, strlen(prefix)); 2575 2576 return 0; 2577 } 2578 2579 /* 2580 * The asynchronous part of sd_probe 2581 */ 2582 static void sd_probe_async(void *data, async_cookie_t cookie) 2583 { 2584 struct scsi_disk *sdkp = data; 2585 struct scsi_device *sdp; 2586 struct gendisk *gd; 2587 u32 index; 2588 struct device *dev; 2589 2590 sdp = sdkp->device; 2591 gd = sdkp->disk; 2592 index = sdkp->index; 2593 dev = &sdp->sdev_gendev; 2594 2595 gd->major = sd_major((index & 0xf0) >> 4); 2596 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2597 gd->minors = SD_MINORS; 2598 2599 gd->fops = &sd_fops; 2600 gd->private_data = &sdkp->driver; 2601 gd->queue = sdkp->device->request_queue; 2602 2603 /* defaults, until the device tells us otherwise */ 2604 sdp->sector_size = 512; 2605 sdkp->capacity = 0; 2606 sdkp->media_present = 1; 2607 sdkp->write_prot = 0; 2608 sdkp->WCE = 0; 2609 sdkp->RCD = 0; 2610 sdkp->ATO = 0; 2611 sdkp->first_scan = 1; 2612 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; 2613 2614 sd_revalidate_disk(gd); 2615 2616 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2617 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn); 2618 2619 gd->driverfs_dev = &sdp->sdev_gendev; 2620 gd->flags = GENHD_FL_EXT_DEVT; 2621 if (sdp->removable) { 2622 gd->flags |= GENHD_FL_REMOVABLE; 2623 gd->events |= DISK_EVENT_MEDIA_CHANGE; 2624 } 2625 2626 add_disk(gd); 2627 sd_dif_config_host(sdkp); 2628 2629 sd_revalidate_disk(gd); 2630 2631 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2632 sdp->removable ? "removable " : ""); 2633 scsi_autopm_put_device(sdp); 2634 put_device(&sdkp->dev); 2635 } 2636 2637 /** 2638 * sd_probe - called during driver initialization and whenever a 2639 * new scsi device is attached to the system. It is called once 2640 * for each scsi device (not just disks) present. 2641 * @dev: pointer to device object 2642 * 2643 * Returns 0 if successful (or not interested in this scsi device 2644 * (e.g. scanner)); 1 when there is an error. 2645 * 2646 * Note: this function is invoked from the scsi mid-level. 2647 * This function sets up the mapping between a given 2648 * <host,channel,id,lun> (found in sdp) and new device name 2649 * (e.g. /dev/sda). More precisely it is the block device major 2650 * and minor number that is chosen here. 2651 * 2652 * Assume sd_probe is not re-entrant (for time being) 2653 * Also think about sd_probe() and sd_remove() running coincidentally. 2654 **/ 2655 static int sd_probe(struct device *dev) 2656 { 2657 struct scsi_device *sdp = to_scsi_device(dev); 2658 struct scsi_disk *sdkp; 2659 struct gendisk *gd; 2660 int index; 2661 int error; 2662 2663 error = -ENODEV; 2664 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2665 goto out; 2666 2667 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2668 "sd_probe\n")); 2669 2670 error = -ENOMEM; 2671 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2672 if (!sdkp) 2673 goto out; 2674 2675 gd = alloc_disk(SD_MINORS); 2676 if (!gd) 2677 goto out_free; 2678 2679 do { 2680 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2681 goto out_put; 2682 2683 spin_lock(&sd_index_lock); 2684 error = ida_get_new(&sd_index_ida, &index); 2685 spin_unlock(&sd_index_lock); 2686 } while (error == -EAGAIN); 2687 2688 if (error) { 2689 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); 2690 goto out_put; 2691 } 2692 2693 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2694 if (error) { 2695 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); 2696 goto out_free_index; 2697 } 2698 2699 sdkp->device = sdp; 2700 sdkp->driver = &sd_template; 2701 sdkp->disk = gd; 2702 sdkp->index = index; 2703 atomic_set(&sdkp->openers, 0); 2704 2705 if (!sdp->request_queue->rq_timeout) { 2706 if (sdp->type != TYPE_MOD) 2707 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2708 else 2709 blk_queue_rq_timeout(sdp->request_queue, 2710 SD_MOD_TIMEOUT); 2711 } 2712 2713 device_initialize(&sdkp->dev); 2714 sdkp->dev.parent = dev; 2715 sdkp->dev.class = &sd_disk_class; 2716 dev_set_name(&sdkp->dev, dev_name(dev)); 2717 2718 if (device_add(&sdkp->dev)) 2719 goto out_free_index; 2720 2721 get_device(dev); 2722 dev_set_drvdata(dev, sdkp); 2723 2724 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2725 async_schedule(sd_probe_async, sdkp); 2726 2727 return 0; 2728 2729 out_free_index: 2730 spin_lock(&sd_index_lock); 2731 ida_remove(&sd_index_ida, index); 2732 spin_unlock(&sd_index_lock); 2733 out_put: 2734 put_disk(gd); 2735 out_free: 2736 kfree(sdkp); 2737 out: 2738 return error; 2739 } 2740 2741 /** 2742 * sd_remove - called whenever a scsi disk (previously recognized by 2743 * sd_probe) is detached from the system. It is called (potentially 2744 * multiple times) during sd module unload. 2745 * @sdp: pointer to mid level scsi device object 2746 * 2747 * Note: this function is invoked from the scsi mid-level. 2748 * This function potentially frees up a device name (e.g. /dev/sdc) 2749 * that could be re-used by a subsequent sd_probe(). 2750 * This function is not called when the built-in sd driver is "exit-ed". 2751 **/ 2752 static int sd_remove(struct device *dev) 2753 { 2754 struct scsi_disk *sdkp; 2755 2756 sdkp = dev_get_drvdata(dev); 2757 scsi_autopm_get_device(sdkp->device); 2758 2759 async_synchronize_full(); 2760 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 2761 blk_queue_unprep_rq(sdkp->device->request_queue, NULL); 2762 device_del(&sdkp->dev); 2763 del_gendisk(sdkp->disk); 2764 sd_shutdown(dev); 2765 2766 mutex_lock(&sd_ref_mutex); 2767 dev_set_drvdata(dev, NULL); 2768 put_device(&sdkp->dev); 2769 mutex_unlock(&sd_ref_mutex); 2770 2771 return 0; 2772 } 2773 2774 /** 2775 * scsi_disk_release - Called to free the scsi_disk structure 2776 * @dev: pointer to embedded class device 2777 * 2778 * sd_ref_mutex must be held entering this routine. Because it is 2779 * called on last put, you should always use the scsi_disk_get() 2780 * scsi_disk_put() helpers which manipulate the semaphore directly 2781 * and never do a direct put_device. 2782 **/ 2783 static void scsi_disk_release(struct device *dev) 2784 { 2785 struct scsi_disk *sdkp = to_scsi_disk(dev); 2786 struct gendisk *disk = sdkp->disk; 2787 2788 spin_lock(&sd_index_lock); 2789 ida_remove(&sd_index_ida, sdkp->index); 2790 spin_unlock(&sd_index_lock); 2791 2792 disk->private_data = NULL; 2793 put_disk(disk); 2794 put_device(&sdkp->device->sdev_gendev); 2795 2796 kfree(sdkp); 2797 } 2798 2799 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 2800 { 2801 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 2802 struct scsi_sense_hdr sshdr; 2803 struct scsi_device *sdp = sdkp->device; 2804 int res; 2805 2806 if (start) 2807 cmd[4] |= 1; /* START */ 2808 2809 if (sdp->start_stop_pwr_cond) 2810 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 2811 2812 if (!scsi_device_online(sdp)) 2813 return -ENODEV; 2814 2815 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 2816 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2817 if (res) { 2818 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 2819 sd_print_result(sdkp, res); 2820 if (driver_byte(res) & DRIVER_SENSE) 2821 sd_print_sense_hdr(sdkp, &sshdr); 2822 } 2823 2824 return res; 2825 } 2826 2827 /* 2828 * Send a SYNCHRONIZE CACHE instruction down to the device through 2829 * the normal SCSI command structure. Wait for the command to 2830 * complete. 2831 */ 2832 static void sd_shutdown(struct device *dev) 2833 { 2834 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2835 2836 if (!sdkp) 2837 return; /* this can happen */ 2838 2839 if (pm_runtime_suspended(dev)) 2840 goto exit; 2841 2842 if (sdkp->WCE) { 2843 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2844 sd_sync_cache(sdkp); 2845 } 2846 2847 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 2848 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2849 sd_start_stop_device(sdkp, 0); 2850 } 2851 2852 exit: 2853 scsi_disk_put(sdkp); 2854 } 2855 2856 static int sd_suspend(struct device *dev, pm_message_t mesg) 2857 { 2858 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2859 int ret = 0; 2860 2861 if (!sdkp) 2862 return 0; /* this can happen */ 2863 2864 if (sdkp->WCE) { 2865 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2866 ret = sd_sync_cache(sdkp); 2867 if (ret) 2868 goto done; 2869 } 2870 2871 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 2872 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2873 ret = sd_start_stop_device(sdkp, 0); 2874 } 2875 2876 done: 2877 scsi_disk_put(sdkp); 2878 return ret; 2879 } 2880 2881 static int sd_resume(struct device *dev) 2882 { 2883 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2884 int ret = 0; 2885 2886 if (!sdkp->device->manage_start_stop) 2887 goto done; 2888 2889 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 2890 ret = sd_start_stop_device(sdkp, 1); 2891 2892 done: 2893 scsi_disk_put(sdkp); 2894 return ret; 2895 } 2896 2897 /** 2898 * init_sd - entry point for this driver (both when built in or when 2899 * a module). 2900 * 2901 * Note: this function registers this driver with the scsi mid-level. 2902 **/ 2903 static int __init init_sd(void) 2904 { 2905 int majors = 0, i, err; 2906 2907 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 2908 2909 for (i = 0; i < SD_MAJORS; i++) 2910 if (register_blkdev(sd_major(i), "sd") == 0) 2911 majors++; 2912 2913 if (!majors) 2914 return -ENODEV; 2915 2916 err = class_register(&sd_disk_class); 2917 if (err) 2918 goto err_out; 2919 2920 err = scsi_register_driver(&sd_template.gendrv); 2921 if (err) 2922 goto err_out_class; 2923 2924 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 2925 0, 0, NULL); 2926 if (!sd_cdb_cache) { 2927 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 2928 goto err_out_class; 2929 } 2930 2931 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 2932 if (!sd_cdb_pool) { 2933 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 2934 goto err_out_cache; 2935 } 2936 2937 return 0; 2938 2939 err_out_cache: 2940 kmem_cache_destroy(sd_cdb_cache); 2941 2942 err_out_class: 2943 class_unregister(&sd_disk_class); 2944 err_out: 2945 for (i = 0; i < SD_MAJORS; i++) 2946 unregister_blkdev(sd_major(i), "sd"); 2947 return err; 2948 } 2949 2950 /** 2951 * exit_sd - exit point for this driver (when it is a module). 2952 * 2953 * Note: this function unregisters this driver from the scsi mid-level. 2954 **/ 2955 static void __exit exit_sd(void) 2956 { 2957 int i; 2958 2959 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 2960 2961 mempool_destroy(sd_cdb_pool); 2962 kmem_cache_destroy(sd_cdb_cache); 2963 2964 scsi_unregister_driver(&sd_template.gendrv); 2965 class_unregister(&sd_disk_class); 2966 2967 for (i = 0; i < SD_MAJORS; i++) 2968 unregister_blkdev(sd_major(i), "sd"); 2969 } 2970 2971 module_init(init_sd); 2972 module_exit(exit_sd); 2973 2974 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 2975 struct scsi_sense_hdr *sshdr) 2976 { 2977 sd_printk(KERN_INFO, sdkp, " "); 2978 scsi_show_sense_hdr(sshdr); 2979 sd_printk(KERN_INFO, sdkp, " "); 2980 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 2981 } 2982 2983 static void sd_print_result(struct scsi_disk *sdkp, int result) 2984 { 2985 sd_printk(KERN_INFO, sdkp, " "); 2986 scsi_show_result(result); 2987 } 2988 2989