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 <asm/uaccess.h> 54 #include <asm/unaligned.h> 55 56 #include <scsi/scsi.h> 57 #include <scsi/scsi_cmnd.h> 58 #include <scsi/scsi_dbg.h> 59 #include <scsi/scsi_device.h> 60 #include <scsi/scsi_driver.h> 61 #include <scsi/scsi_eh.h> 62 #include <scsi/scsi_host.h> 63 #include <scsi/scsi_ioctl.h> 64 #include <scsi/scsicam.h> 65 66 #include "sd.h" 67 #include "scsi_logging.h" 68 69 MODULE_AUTHOR("Eric Youngdale"); 70 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 71 MODULE_LICENSE("GPL"); 72 73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 92 93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 94 #define SD_MINORS 16 95 #else 96 #define SD_MINORS 0 97 #endif 98 99 static void sd_config_discard(struct scsi_disk *, unsigned int); 100 static int sd_revalidate_disk(struct gendisk *); 101 static void sd_unlock_native_capacity(struct gendisk *disk); 102 static int sd_probe(struct device *); 103 static int sd_remove(struct device *); 104 static void sd_shutdown(struct device *); 105 static int sd_suspend(struct device *, pm_message_t state); 106 static int sd_resume(struct device *); 107 static void sd_rescan(struct device *); 108 static int sd_done(struct scsi_cmnd *); 109 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 110 static void scsi_disk_release(struct device *cdev); 111 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 112 static void sd_print_result(struct scsi_disk *, int); 113 114 static DEFINE_SPINLOCK(sd_index_lock); 115 static DEFINE_IDA(sd_index_ida); 116 117 /* This semaphore is used to mediate the 0->1 reference get in the 118 * face of object destruction (i.e. we can't allow a get on an 119 * object after last put) */ 120 static DEFINE_MUTEX(sd_ref_mutex); 121 122 static struct kmem_cache *sd_cdb_cache; 123 static mempool_t *sd_cdb_pool; 124 125 static const char *sd_cache_types[] = { 126 "write through", "none", "write back", 127 "write back, no read (daft)" 128 }; 129 130 static ssize_t 131 sd_store_cache_type(struct device *dev, struct device_attribute *attr, 132 const char *buf, size_t count) 133 { 134 int i, ct = -1, rcd, wce, sp; 135 struct scsi_disk *sdkp = to_scsi_disk(dev); 136 struct scsi_device *sdp = sdkp->device; 137 char buffer[64]; 138 char *buffer_data; 139 struct scsi_mode_data data; 140 struct scsi_sense_hdr sshdr; 141 int len; 142 143 if (sdp->type != TYPE_DISK) 144 /* no cache control on RBC devices; theoretically they 145 * can do it, but there's probably so many exceptions 146 * it's not worth the risk */ 147 return -EINVAL; 148 149 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 150 len = strlen(sd_cache_types[i]); 151 if (strncmp(sd_cache_types[i], buf, len) == 0 && 152 buf[len] == '\n') { 153 ct = i; 154 break; 155 } 156 } 157 if (ct < 0) 158 return -EINVAL; 159 rcd = ct & 0x01 ? 1 : 0; 160 wce = ct & 0x02 ? 1 : 0; 161 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 162 SD_MAX_RETRIES, &data, NULL)) 163 return -EINVAL; 164 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 165 data.block_descriptor_length); 166 buffer_data = buffer + data.header_length + 167 data.block_descriptor_length; 168 buffer_data[2] &= ~0x05; 169 buffer_data[2] |= wce << 2 | rcd; 170 sp = buffer_data[0] & 0x80 ? 1 : 0; 171 172 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 173 SD_MAX_RETRIES, &data, &sshdr)) { 174 if (scsi_sense_valid(&sshdr)) 175 sd_print_sense_hdr(sdkp, &sshdr); 176 return -EINVAL; 177 } 178 revalidate_disk(sdkp->disk); 179 return count; 180 } 181 182 static ssize_t 183 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, 184 const char *buf, size_t count) 185 { 186 struct scsi_disk *sdkp = to_scsi_disk(dev); 187 struct scsi_device *sdp = sdkp->device; 188 189 if (!capable(CAP_SYS_ADMIN)) 190 return -EACCES; 191 192 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 193 194 return count; 195 } 196 197 static ssize_t 198 sd_store_allow_restart(struct device *dev, struct device_attribute *attr, 199 const char *buf, size_t count) 200 { 201 struct scsi_disk *sdkp = to_scsi_disk(dev); 202 struct scsi_device *sdp = sdkp->device; 203 204 if (!capable(CAP_SYS_ADMIN)) 205 return -EACCES; 206 207 if (sdp->type != TYPE_DISK) 208 return -EINVAL; 209 210 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 211 212 return count; 213 } 214 215 static ssize_t 216 sd_show_cache_type(struct device *dev, struct device_attribute *attr, 217 char *buf) 218 { 219 struct scsi_disk *sdkp = to_scsi_disk(dev); 220 int ct = sdkp->RCD + 2*sdkp->WCE; 221 222 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 223 } 224 225 static ssize_t 226 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) 227 { 228 struct scsi_disk *sdkp = to_scsi_disk(dev); 229 230 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 231 } 232 233 static ssize_t 234 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, 235 char *buf) 236 { 237 struct scsi_disk *sdkp = to_scsi_disk(dev); 238 struct scsi_device *sdp = sdkp->device; 239 240 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 241 } 242 243 static ssize_t 244 sd_show_allow_restart(struct device *dev, struct device_attribute *attr, 245 char *buf) 246 { 247 struct scsi_disk *sdkp = to_scsi_disk(dev); 248 249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 250 } 251 252 static ssize_t 253 sd_show_protection_type(struct device *dev, struct device_attribute *attr, 254 char *buf) 255 { 256 struct scsi_disk *sdkp = to_scsi_disk(dev); 257 258 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 259 } 260 261 static ssize_t 262 sd_show_protection_mode(struct device *dev, struct device_attribute *attr, 263 char *buf) 264 { 265 struct scsi_disk *sdkp = to_scsi_disk(dev); 266 struct scsi_device *sdp = sdkp->device; 267 unsigned int dif, dix; 268 269 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 270 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); 271 272 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) { 273 dif = 0; 274 dix = 1; 275 } 276 277 if (!dif && !dix) 278 return snprintf(buf, 20, "none\n"); 279 280 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif); 281 } 282 283 static ssize_t 284 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, 285 char *buf) 286 { 287 struct scsi_disk *sdkp = to_scsi_disk(dev); 288 289 return snprintf(buf, 20, "%u\n", sdkp->ATO); 290 } 291 292 static ssize_t 293 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, 294 char *buf) 295 { 296 struct scsi_disk *sdkp = to_scsi_disk(dev); 297 298 return snprintf(buf, 20, "%u\n", sdkp->lbpme); 299 } 300 301 static const char *lbp_mode[] = { 302 [SD_LBP_FULL] = "full", 303 [SD_LBP_UNMAP] = "unmap", 304 [SD_LBP_WS16] = "writesame_16", 305 [SD_LBP_WS10] = "writesame_10", 306 [SD_LBP_ZERO] = "writesame_zero", 307 [SD_LBP_DISABLE] = "disabled", 308 }; 309 310 static ssize_t 311 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr, 312 char *buf) 313 { 314 struct scsi_disk *sdkp = to_scsi_disk(dev); 315 316 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]); 317 } 318 319 static ssize_t 320 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr, 321 const char *buf, size_t count) 322 { 323 struct scsi_disk *sdkp = to_scsi_disk(dev); 324 struct scsi_device *sdp = sdkp->device; 325 326 if (!capable(CAP_SYS_ADMIN)) 327 return -EACCES; 328 329 if (sdp->type != TYPE_DISK) 330 return -EINVAL; 331 332 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20)) 333 sd_config_discard(sdkp, SD_LBP_UNMAP); 334 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20)) 335 sd_config_discard(sdkp, SD_LBP_WS16); 336 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20)) 337 sd_config_discard(sdkp, SD_LBP_WS10); 338 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20)) 339 sd_config_discard(sdkp, SD_LBP_ZERO); 340 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20)) 341 sd_config_discard(sdkp, SD_LBP_DISABLE); 342 else 343 return -EINVAL; 344 345 return count; 346 } 347 348 static struct device_attribute sd_disk_attrs[] = { 349 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 350 sd_store_cache_type), 351 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 352 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 353 sd_store_allow_restart), 354 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 355 sd_store_manage_start_stop), 356 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), 357 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL), 358 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 359 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), 360 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode, 361 sd_store_provisioning_mode), 362 __ATTR_NULL, 363 }; 364 365 static struct class sd_disk_class = { 366 .name = "scsi_disk", 367 .owner = THIS_MODULE, 368 .dev_release = scsi_disk_release, 369 .dev_attrs = sd_disk_attrs, 370 }; 371 372 static struct scsi_driver sd_template = { 373 .owner = THIS_MODULE, 374 .gendrv = { 375 .name = "sd", 376 .probe = sd_probe, 377 .remove = sd_remove, 378 .suspend = sd_suspend, 379 .resume = sd_resume, 380 .shutdown = sd_shutdown, 381 }, 382 .rescan = sd_rescan, 383 .done = sd_done, 384 }; 385 386 /* 387 * Device no to disk mapping: 388 * 389 * major disc2 disc p1 390 * |............|.............|....|....| <- dev_t 391 * 31 20 19 8 7 4 3 0 392 * 393 * Inside a major, we have 16k disks, however mapped non- 394 * contiguously. The first 16 disks are for major0, the next 395 * ones with major1, ... Disk 256 is for major0 again, disk 272 396 * for major1, ... 397 * As we stay compatible with our numbering scheme, we can reuse 398 * the well-know SCSI majors 8, 65--71, 136--143. 399 */ 400 static int sd_major(int major_idx) 401 { 402 switch (major_idx) { 403 case 0: 404 return SCSI_DISK0_MAJOR; 405 case 1 ... 7: 406 return SCSI_DISK1_MAJOR + major_idx - 1; 407 case 8 ... 15: 408 return SCSI_DISK8_MAJOR + major_idx - 8; 409 default: 410 BUG(); 411 return 0; /* shut up gcc */ 412 } 413 } 414 415 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 416 { 417 struct scsi_disk *sdkp = NULL; 418 419 if (disk->private_data) { 420 sdkp = scsi_disk(disk); 421 if (scsi_device_get(sdkp->device) == 0) 422 get_device(&sdkp->dev); 423 else 424 sdkp = NULL; 425 } 426 return sdkp; 427 } 428 429 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 430 { 431 struct scsi_disk *sdkp; 432 433 mutex_lock(&sd_ref_mutex); 434 sdkp = __scsi_disk_get(disk); 435 mutex_unlock(&sd_ref_mutex); 436 return sdkp; 437 } 438 439 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 440 { 441 struct scsi_disk *sdkp; 442 443 mutex_lock(&sd_ref_mutex); 444 sdkp = dev_get_drvdata(dev); 445 if (sdkp) 446 sdkp = __scsi_disk_get(sdkp->disk); 447 mutex_unlock(&sd_ref_mutex); 448 return sdkp; 449 } 450 451 static void scsi_disk_put(struct scsi_disk *sdkp) 452 { 453 struct scsi_device *sdev = sdkp->device; 454 455 mutex_lock(&sd_ref_mutex); 456 put_device(&sdkp->dev); 457 scsi_device_put(sdev); 458 mutex_unlock(&sd_ref_mutex); 459 } 460 461 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) 462 { 463 unsigned int prot_op = SCSI_PROT_NORMAL; 464 unsigned int dix = scsi_prot_sg_count(scmd); 465 466 if (scmd->sc_data_direction == DMA_FROM_DEVICE) { 467 if (dif && dix) 468 prot_op = SCSI_PROT_READ_PASS; 469 else if (dif && !dix) 470 prot_op = SCSI_PROT_READ_STRIP; 471 else if (!dif && dix) 472 prot_op = SCSI_PROT_READ_INSERT; 473 } else { 474 if (dif && dix) 475 prot_op = SCSI_PROT_WRITE_PASS; 476 else if (dif && !dix) 477 prot_op = SCSI_PROT_WRITE_INSERT; 478 else if (!dif && dix) 479 prot_op = SCSI_PROT_WRITE_STRIP; 480 } 481 482 scsi_set_prot_op(scmd, prot_op); 483 scsi_set_prot_type(scmd, dif); 484 } 485 486 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) 487 { 488 struct request_queue *q = sdkp->disk->queue; 489 unsigned int logical_block_size = sdkp->device->sector_size; 490 unsigned int max_blocks = 0; 491 492 q->limits.discard_zeroes_data = sdkp->lbprz; 493 q->limits.discard_alignment = sdkp->unmap_alignment; 494 q->limits.discard_granularity = 495 max(sdkp->physical_block_size, 496 sdkp->unmap_granularity * logical_block_size); 497 498 switch (mode) { 499 500 case SD_LBP_DISABLE: 501 q->limits.max_discard_sectors = 0; 502 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); 503 return; 504 505 case SD_LBP_UNMAP: 506 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff); 507 break; 508 509 case SD_LBP_WS16: 510 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff); 511 break; 512 513 case SD_LBP_WS10: 514 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff); 515 break; 516 517 case SD_LBP_ZERO: 518 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff); 519 q->limits.discard_zeroes_data = 1; 520 break; 521 } 522 523 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9); 524 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 525 526 sdkp->provisioning_mode = mode; 527 } 528 529 /** 530 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device 531 * @sdp: scsi device to operate one 532 * @rq: Request to prepare 533 * 534 * Will issue either UNMAP or WRITE SAME(16) depending on preference 535 * indicated by target device. 536 **/ 537 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq) 538 { 539 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 540 struct bio *bio = rq->bio; 541 sector_t sector = bio->bi_sector; 542 unsigned int nr_sectors = bio_sectors(bio); 543 unsigned int len; 544 int ret; 545 char *buf; 546 struct page *page; 547 548 if (sdkp->device->sector_size == 4096) { 549 sector >>= 3; 550 nr_sectors >>= 3; 551 } 552 553 rq->timeout = SD_TIMEOUT; 554 555 memset(rq->cmd, 0, rq->cmd_len); 556 557 page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 558 if (!page) 559 return BLKPREP_DEFER; 560 561 switch (sdkp->provisioning_mode) { 562 case SD_LBP_UNMAP: 563 buf = page_address(page); 564 565 rq->cmd_len = 10; 566 rq->cmd[0] = UNMAP; 567 rq->cmd[8] = 24; 568 569 put_unaligned_be16(6 + 16, &buf[0]); 570 put_unaligned_be16(16, &buf[2]); 571 put_unaligned_be64(sector, &buf[8]); 572 put_unaligned_be32(nr_sectors, &buf[16]); 573 574 len = 24; 575 break; 576 577 case SD_LBP_WS16: 578 rq->cmd_len = 16; 579 rq->cmd[0] = WRITE_SAME_16; 580 rq->cmd[1] = 0x8; /* UNMAP */ 581 put_unaligned_be64(sector, &rq->cmd[2]); 582 put_unaligned_be32(nr_sectors, &rq->cmd[10]); 583 584 len = sdkp->device->sector_size; 585 break; 586 587 case SD_LBP_WS10: 588 case SD_LBP_ZERO: 589 rq->cmd_len = 10; 590 rq->cmd[0] = WRITE_SAME; 591 if (sdkp->provisioning_mode == SD_LBP_WS10) 592 rq->cmd[1] = 0x8; /* UNMAP */ 593 put_unaligned_be32(sector, &rq->cmd[2]); 594 put_unaligned_be16(nr_sectors, &rq->cmd[7]); 595 596 len = sdkp->device->sector_size; 597 break; 598 599 default: 600 ret = BLKPREP_KILL; 601 goto out; 602 } 603 604 blk_add_request_payload(rq, page, len); 605 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 606 rq->buffer = page_address(page); 607 608 out: 609 if (ret != BLKPREP_OK) { 610 __free_page(page); 611 rq->buffer = NULL; 612 } 613 return ret; 614 } 615 616 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq) 617 { 618 rq->timeout = SD_FLUSH_TIMEOUT; 619 rq->retries = SD_MAX_RETRIES; 620 rq->cmd[0] = SYNCHRONIZE_CACHE; 621 rq->cmd_len = 10; 622 623 return scsi_setup_blk_pc_cmnd(sdp, rq); 624 } 625 626 static void sd_unprep_fn(struct request_queue *q, struct request *rq) 627 { 628 if (rq->cmd_flags & REQ_DISCARD) { 629 free_page((unsigned long)rq->buffer); 630 rq->buffer = NULL; 631 } 632 } 633 634 /** 635 * sd_init_command - build a scsi (read or write) command from 636 * information in the request structure. 637 * @SCpnt: pointer to mid-level's per scsi command structure that 638 * contains request and into which the scsi command is written 639 * 640 * Returns 1 if successful and 0 if error (or cannot be done now). 641 **/ 642 static int sd_prep_fn(struct request_queue *q, struct request *rq) 643 { 644 struct scsi_cmnd *SCpnt; 645 struct scsi_device *sdp = q->queuedata; 646 struct gendisk *disk = rq->rq_disk; 647 struct scsi_disk *sdkp; 648 sector_t block = blk_rq_pos(rq); 649 sector_t threshold; 650 unsigned int this_count = blk_rq_sectors(rq); 651 int ret, host_dif; 652 unsigned char protect; 653 654 /* 655 * Discard request come in as REQ_TYPE_FS but we turn them into 656 * block PC requests to make life easier. 657 */ 658 if (rq->cmd_flags & REQ_DISCARD) { 659 ret = scsi_setup_discard_cmnd(sdp, rq); 660 goto out; 661 } else if (rq->cmd_flags & REQ_FLUSH) { 662 ret = scsi_setup_flush_cmnd(sdp, rq); 663 goto out; 664 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 665 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 666 goto out; 667 } else if (rq->cmd_type != REQ_TYPE_FS) { 668 ret = BLKPREP_KILL; 669 goto out; 670 } 671 ret = scsi_setup_fs_cmnd(sdp, rq); 672 if (ret != BLKPREP_OK) 673 goto out; 674 SCpnt = rq->special; 675 sdkp = scsi_disk(disk); 676 677 /* from here on until we're complete, any goto out 678 * is used for a killable error condition */ 679 ret = BLKPREP_KILL; 680 681 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 682 "sd_init_command: block=%llu, " 683 "count=%d\n", 684 (unsigned long long)block, 685 this_count)); 686 687 if (!sdp || !scsi_device_online(sdp) || 688 block + blk_rq_sectors(rq) > get_capacity(disk)) { 689 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 690 "Finishing %u sectors\n", 691 blk_rq_sectors(rq))); 692 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 693 "Retry with 0x%p\n", SCpnt)); 694 goto out; 695 } 696 697 if (sdp->changed) { 698 /* 699 * quietly refuse to do anything to a changed disc until 700 * the changed bit has been reset 701 */ 702 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ 703 goto out; 704 } 705 706 /* 707 * Some SD card readers can't handle multi-sector accesses which touch 708 * the last one or two hardware sectors. Split accesses as needed. 709 */ 710 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 711 (sdp->sector_size / 512); 712 713 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 714 if (block < threshold) { 715 /* Access up to the threshold but not beyond */ 716 this_count = threshold - block; 717 } else { 718 /* Access only a single hardware sector */ 719 this_count = sdp->sector_size / 512; 720 } 721 } 722 723 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 724 (unsigned long long)block)); 725 726 /* 727 * If we have a 1K hardware sectorsize, prevent access to single 728 * 512 byte sectors. In theory we could handle this - in fact 729 * the scsi cdrom driver must be able to handle this because 730 * we typically use 1K blocksizes, and cdroms typically have 731 * 2K hardware sectorsizes. Of course, things are simpler 732 * with the cdrom, since it is read-only. For performance 733 * reasons, the filesystems should be able to handle this 734 * and not force the scsi disk driver to use bounce buffers 735 * for this. 736 */ 737 if (sdp->sector_size == 1024) { 738 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 739 scmd_printk(KERN_ERR, SCpnt, 740 "Bad block number requested\n"); 741 goto out; 742 } else { 743 block = block >> 1; 744 this_count = this_count >> 1; 745 } 746 } 747 if (sdp->sector_size == 2048) { 748 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 749 scmd_printk(KERN_ERR, SCpnt, 750 "Bad block number requested\n"); 751 goto out; 752 } else { 753 block = block >> 2; 754 this_count = this_count >> 2; 755 } 756 } 757 if (sdp->sector_size == 4096) { 758 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 759 scmd_printk(KERN_ERR, SCpnt, 760 "Bad block number requested\n"); 761 goto out; 762 } else { 763 block = block >> 3; 764 this_count = this_count >> 3; 765 } 766 } 767 if (rq_data_dir(rq) == WRITE) { 768 if (!sdp->writeable) { 769 goto out; 770 } 771 SCpnt->cmnd[0] = WRITE_6; 772 SCpnt->sc_data_direction = DMA_TO_DEVICE; 773 774 if (blk_integrity_rq(rq) && 775 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) 776 goto out; 777 778 } else if (rq_data_dir(rq) == READ) { 779 SCpnt->cmnd[0] = READ_6; 780 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 781 } else { 782 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 783 goto out; 784 } 785 786 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 787 "%s %d/%u 512 byte blocks.\n", 788 (rq_data_dir(rq) == WRITE) ? 789 "writing" : "reading", this_count, 790 blk_rq_sectors(rq))); 791 792 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ 793 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 794 if (host_dif) 795 protect = 1 << 5; 796 else 797 protect = 0; 798 799 if (host_dif == SD_DIF_TYPE2_PROTECTION) { 800 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 801 802 if (unlikely(SCpnt->cmnd == NULL)) { 803 ret = BLKPREP_DEFER; 804 goto out; 805 } 806 807 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 808 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 809 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 810 SCpnt->cmnd[7] = 0x18; 811 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 812 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 813 814 /* LBA */ 815 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 816 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 817 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 818 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 819 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 820 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 821 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 822 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 823 824 /* Expected Indirect LBA */ 825 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 826 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 827 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 828 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 829 830 /* Transfer length */ 831 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 832 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 833 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 834 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 835 } else if (block > 0xffffffff) { 836 SCpnt->cmnd[0] += READ_16 - READ_6; 837 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 838 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 839 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 840 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 841 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 842 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 843 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 844 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 845 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 846 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 847 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 848 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 849 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 850 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 851 } else if ((this_count > 0xff) || (block > 0x1fffff) || 852 scsi_device_protection(SCpnt->device) || 853 SCpnt->device->use_10_for_rw) { 854 if (this_count > 0xffff) 855 this_count = 0xffff; 856 857 SCpnt->cmnd[0] += READ_10 - READ_6; 858 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 859 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 860 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 861 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 862 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 863 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 864 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 865 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 866 } else { 867 if (unlikely(rq->cmd_flags & REQ_FUA)) { 868 /* 869 * This happens only if this drive failed 870 * 10byte rw command with ILLEGAL_REQUEST 871 * during operation and thus turned off 872 * use_10_for_rw. 873 */ 874 scmd_printk(KERN_ERR, SCpnt, 875 "FUA write on READ/WRITE(6) drive\n"); 876 goto out; 877 } 878 879 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 880 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 881 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 882 SCpnt->cmnd[4] = (unsigned char) this_count; 883 SCpnt->cmnd[5] = 0; 884 } 885 SCpnt->sdb.length = this_count * sdp->sector_size; 886 887 /* If DIF or DIX is enabled, tell HBA how to handle request */ 888 if (host_dif || scsi_prot_sg_count(SCpnt)) 889 sd_prot_op(SCpnt, host_dif); 890 891 /* 892 * We shouldn't disconnect in the middle of a sector, so with a dumb 893 * host adapter, it's safe to assume that we can at least transfer 894 * this many bytes between each connect / disconnect. 895 */ 896 SCpnt->transfersize = sdp->sector_size; 897 SCpnt->underflow = this_count << 9; 898 SCpnt->allowed = SD_MAX_RETRIES; 899 900 /* 901 * This indicates that the command is ready from our end to be 902 * queued. 903 */ 904 ret = BLKPREP_OK; 905 out: 906 return scsi_prep_return(q, rq, ret); 907 } 908 909 /** 910 * sd_open - open a scsi disk device 911 * @inode: only i_rdev member may be used 912 * @filp: only f_mode and f_flags may be used 913 * 914 * Returns 0 if successful. Returns a negated errno value in case 915 * of error. 916 * 917 * Note: This can be called from a user context (e.g. fsck(1) ) 918 * or from within the kernel (e.g. as a result of a mount(1) ). 919 * In the latter case @inode and @filp carry an abridged amount 920 * of information as noted above. 921 * 922 * Locking: called with bdev->bd_mutex held. 923 **/ 924 static int sd_open(struct block_device *bdev, fmode_t mode) 925 { 926 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 927 struct scsi_device *sdev; 928 int retval; 929 930 if (!sdkp) 931 return -ENXIO; 932 933 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 934 935 sdev = sdkp->device; 936 937 retval = scsi_autopm_get_device(sdev); 938 if (retval) 939 goto error_autopm; 940 941 /* 942 * If the device is in error recovery, wait until it is done. 943 * If the device is offline, then disallow any access to it. 944 */ 945 retval = -ENXIO; 946 if (!scsi_block_when_processing_errors(sdev)) 947 goto error_out; 948 949 if (sdev->removable || sdkp->write_prot) 950 check_disk_change(bdev); 951 952 /* 953 * If the drive is empty, just let the open fail. 954 */ 955 retval = -ENOMEDIUM; 956 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 957 goto error_out; 958 959 /* 960 * If the device has the write protect tab set, have the open fail 961 * if the user expects to be able to write to the thing. 962 */ 963 retval = -EROFS; 964 if (sdkp->write_prot && (mode & FMODE_WRITE)) 965 goto error_out; 966 967 /* 968 * It is possible that the disk changing stuff resulted in 969 * the device being taken offline. If this is the case, 970 * report this to the user, and don't pretend that the 971 * open actually succeeded. 972 */ 973 retval = -ENXIO; 974 if (!scsi_device_online(sdev)) 975 goto error_out; 976 977 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 978 if (scsi_block_when_processing_errors(sdev)) 979 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 980 } 981 982 return 0; 983 984 error_out: 985 scsi_autopm_put_device(sdev); 986 error_autopm: 987 scsi_disk_put(sdkp); 988 return retval; 989 } 990 991 /** 992 * sd_release - invoked when the (last) close(2) is called on this 993 * scsi disk. 994 * @inode: only i_rdev member may be used 995 * @filp: only f_mode and f_flags may be used 996 * 997 * Returns 0. 998 * 999 * Note: may block (uninterruptible) if error recovery is underway 1000 * on this disk. 1001 * 1002 * Locking: called with bdev->bd_mutex held. 1003 **/ 1004 static int sd_release(struct gendisk *disk, fmode_t mode) 1005 { 1006 struct scsi_disk *sdkp = scsi_disk(disk); 1007 struct scsi_device *sdev = sdkp->device; 1008 1009 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 1010 1011 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { 1012 if (scsi_block_when_processing_errors(sdev)) 1013 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 1014 } 1015 1016 /* 1017 * XXX and what if there are packets in flight and this close() 1018 * XXX is followed by a "rmmod sd_mod"? 1019 */ 1020 1021 scsi_autopm_put_device(sdev); 1022 scsi_disk_put(sdkp); 1023 return 0; 1024 } 1025 1026 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1027 { 1028 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 1029 struct scsi_device *sdp = sdkp->device; 1030 struct Scsi_Host *host = sdp->host; 1031 int diskinfo[4]; 1032 1033 /* default to most commonly used values */ 1034 diskinfo[0] = 0x40; /* 1 << 6 */ 1035 diskinfo[1] = 0x20; /* 1 << 5 */ 1036 diskinfo[2] = sdkp->capacity >> 11; 1037 1038 /* override with calculated, extended default, or driver values */ 1039 if (host->hostt->bios_param) 1040 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 1041 else 1042 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 1043 1044 geo->heads = diskinfo[0]; 1045 geo->sectors = diskinfo[1]; 1046 geo->cylinders = diskinfo[2]; 1047 return 0; 1048 } 1049 1050 /** 1051 * sd_ioctl - process an ioctl 1052 * @inode: only i_rdev/i_bdev members may be used 1053 * @filp: only f_mode and f_flags may be used 1054 * @cmd: ioctl command number 1055 * @arg: this is third argument given to ioctl(2) system call. 1056 * Often contains a pointer. 1057 * 1058 * Returns 0 if successful (some ioctls return positive numbers on 1059 * success as well). Returns a negated errno value in case of error. 1060 * 1061 * Note: most ioctls are forward onto the block subsystem or further 1062 * down in the scsi subsystem. 1063 **/ 1064 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 1065 unsigned int cmd, unsigned long arg) 1066 { 1067 struct gendisk *disk = bdev->bd_disk; 1068 struct scsi_device *sdp = scsi_disk(disk)->device; 1069 void __user *p = (void __user *)arg; 1070 int error; 1071 1072 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 1073 disk->disk_name, cmd)); 1074 1075 /* 1076 * If we are in the middle of error recovery, don't let anyone 1077 * else try and use this device. Also, if error recovery fails, it 1078 * may try and take the device offline, in which case all further 1079 * access to the device is prohibited. 1080 */ 1081 error = scsi_nonblockable_ioctl(sdp, cmd, p, 1082 (mode & FMODE_NDELAY) != 0); 1083 if (!scsi_block_when_processing_errors(sdp) || !error) 1084 goto out; 1085 1086 /* 1087 * Send SCSI addressing ioctls directly to mid level, send other 1088 * ioctls to block level and then onto mid level if they can't be 1089 * resolved. 1090 */ 1091 switch (cmd) { 1092 case SCSI_IOCTL_GET_IDLUN: 1093 case SCSI_IOCTL_GET_BUS_NUMBER: 1094 error = scsi_ioctl(sdp, cmd, p); 1095 break; 1096 default: 1097 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); 1098 if (error != -ENOTTY) 1099 break; 1100 error = scsi_ioctl(sdp, cmd, p); 1101 break; 1102 } 1103 out: 1104 return error; 1105 } 1106 1107 static void set_media_not_present(struct scsi_disk *sdkp) 1108 { 1109 if (sdkp->media_present) 1110 sdkp->device->changed = 1; 1111 1112 if (sdkp->device->removable) { 1113 sdkp->media_present = 0; 1114 sdkp->capacity = 0; 1115 } 1116 } 1117 1118 static int media_not_present(struct scsi_disk *sdkp, 1119 struct scsi_sense_hdr *sshdr) 1120 { 1121 if (!scsi_sense_valid(sshdr)) 1122 return 0; 1123 1124 /* not invoked for commands that could return deferred errors */ 1125 switch (sshdr->sense_key) { 1126 case UNIT_ATTENTION: 1127 case NOT_READY: 1128 /* medium not present */ 1129 if (sshdr->asc == 0x3A) { 1130 set_media_not_present(sdkp); 1131 return 1; 1132 } 1133 } 1134 return 0; 1135 } 1136 1137 /** 1138 * sd_check_events - check media events 1139 * @disk: kernel device descriptor 1140 * @clearing: disk events currently being cleared 1141 * 1142 * Returns mask of DISK_EVENT_*. 1143 * 1144 * Note: this function is invoked from the block subsystem. 1145 **/ 1146 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) 1147 { 1148 struct scsi_disk *sdkp = scsi_disk(disk); 1149 struct scsi_device *sdp = sdkp->device; 1150 struct scsi_sense_hdr *sshdr = NULL; 1151 int retval; 1152 1153 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); 1154 1155 /* 1156 * If the device is offline, don't send any commands - just pretend as 1157 * if the command failed. If the device ever comes back online, we 1158 * can deal with it then. It is only because of unrecoverable errors 1159 * that we would ever take a device offline in the first place. 1160 */ 1161 if (!scsi_device_online(sdp)) { 1162 set_media_not_present(sdkp); 1163 goto out; 1164 } 1165 1166 /* 1167 * Using TEST_UNIT_READY enables differentiation between drive with 1168 * no cartridge loaded - NOT READY, drive with changed cartridge - 1169 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1170 * 1171 * Drives that auto spin down. eg iomega jaz 1G, will be started 1172 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1173 * sd_revalidate() is called. 1174 */ 1175 retval = -ENODEV; 1176 1177 if (scsi_block_when_processing_errors(sdp)) { 1178 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 1179 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1180 sshdr); 1181 } 1182 1183 /* failed to execute TUR, assume media not present */ 1184 if (host_byte(retval)) { 1185 set_media_not_present(sdkp); 1186 goto out; 1187 } 1188 1189 if (media_not_present(sdkp, sshdr)) 1190 goto out; 1191 1192 /* 1193 * For removable scsi disk we have to recognise the presence 1194 * of a disk in the drive. 1195 */ 1196 if (!sdkp->media_present) 1197 sdp->changed = 1; 1198 sdkp->media_present = 1; 1199 out: 1200 /* 1201 * sdp->changed is set under the following conditions: 1202 * 1203 * Medium present state has changed in either direction. 1204 * Device has indicated UNIT_ATTENTION. 1205 */ 1206 kfree(sshdr); 1207 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; 1208 sdp->changed = 0; 1209 return retval; 1210 } 1211 1212 static int sd_sync_cache(struct scsi_disk *sdkp) 1213 { 1214 int retries, res; 1215 struct scsi_device *sdp = sdkp->device; 1216 struct scsi_sense_hdr sshdr; 1217 1218 if (!scsi_device_online(sdp)) 1219 return -ENODEV; 1220 1221 1222 for (retries = 3; retries > 0; --retries) { 1223 unsigned char cmd[10] = { 0 }; 1224 1225 cmd[0] = SYNCHRONIZE_CACHE; 1226 /* 1227 * Leave the rest of the command zero to indicate 1228 * flush everything. 1229 */ 1230 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 1231 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL); 1232 if (res == 0) 1233 break; 1234 } 1235 1236 if (res) { 1237 sd_print_result(sdkp, res); 1238 if (driver_byte(res) & DRIVER_SENSE) 1239 sd_print_sense_hdr(sdkp, &sshdr); 1240 } 1241 1242 if (res) 1243 return -EIO; 1244 return 0; 1245 } 1246 1247 static void sd_rescan(struct device *dev) 1248 { 1249 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1250 1251 if (sdkp) { 1252 revalidate_disk(sdkp->disk); 1253 scsi_disk_put(sdkp); 1254 } 1255 } 1256 1257 1258 #ifdef CONFIG_COMPAT 1259 /* 1260 * This gets directly called from VFS. When the ioctl 1261 * is not recognized we go back to the other translation paths. 1262 */ 1263 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1264 unsigned int cmd, unsigned long arg) 1265 { 1266 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1267 1268 /* 1269 * If we are in the middle of error recovery, don't let anyone 1270 * else try and use this device. Also, if error recovery fails, it 1271 * may try and take the device offline, in which case all further 1272 * access to the device is prohibited. 1273 */ 1274 if (!scsi_block_when_processing_errors(sdev)) 1275 return -ENODEV; 1276 1277 if (sdev->host->hostt->compat_ioctl) { 1278 int ret; 1279 1280 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1281 1282 return ret; 1283 } 1284 1285 /* 1286 * Let the static ioctl translation table take care of it. 1287 */ 1288 return -ENOIOCTLCMD; 1289 } 1290 #endif 1291 1292 static const struct block_device_operations sd_fops = { 1293 .owner = THIS_MODULE, 1294 .open = sd_open, 1295 .release = sd_release, 1296 .ioctl = sd_ioctl, 1297 .getgeo = sd_getgeo, 1298 #ifdef CONFIG_COMPAT 1299 .compat_ioctl = sd_compat_ioctl, 1300 #endif 1301 .check_events = sd_check_events, 1302 .revalidate_disk = sd_revalidate_disk, 1303 .unlock_native_capacity = sd_unlock_native_capacity, 1304 }; 1305 1306 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1307 { 1308 u64 start_lba = blk_rq_pos(scmd->request); 1309 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1310 u64 bad_lba; 1311 int info_valid; 1312 /* 1313 * resid is optional but mostly filled in. When it's unused, 1314 * its value is zero, so we assume the whole buffer transferred 1315 */ 1316 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); 1317 unsigned int good_bytes; 1318 1319 if (scmd->request->cmd_type != REQ_TYPE_FS) 1320 return 0; 1321 1322 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1323 SCSI_SENSE_BUFFERSIZE, 1324 &bad_lba); 1325 if (!info_valid) 1326 return 0; 1327 1328 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1329 return 0; 1330 1331 if (scmd->device->sector_size < 512) { 1332 /* only legitimate sector_size here is 256 */ 1333 start_lba <<= 1; 1334 end_lba <<= 1; 1335 } else { 1336 /* be careful ... don't want any overflows */ 1337 u64 factor = scmd->device->sector_size / 512; 1338 do_div(start_lba, factor); 1339 do_div(end_lba, factor); 1340 } 1341 1342 /* The bad lba was reported incorrectly, we have no idea where 1343 * the error is. 1344 */ 1345 if (bad_lba < start_lba || bad_lba >= end_lba) 1346 return 0; 1347 1348 /* This computation should always be done in terms of 1349 * the resolution of the device's medium. 1350 */ 1351 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; 1352 return min(good_bytes, transferred); 1353 } 1354 1355 /** 1356 * sd_done - bottom half handler: called when the lower level 1357 * driver has completed (successfully or otherwise) a scsi command. 1358 * @SCpnt: mid-level's per command structure. 1359 * 1360 * Note: potentially run from within an ISR. Must not block. 1361 **/ 1362 static int sd_done(struct scsi_cmnd *SCpnt) 1363 { 1364 int result = SCpnt->result; 1365 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1366 struct scsi_sense_hdr sshdr; 1367 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1368 int sense_valid = 0; 1369 int sense_deferred = 0; 1370 unsigned char op = SCpnt->cmnd[0]; 1371 1372 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result) 1373 scsi_set_resid(SCpnt, 0); 1374 1375 if (result) { 1376 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1377 if (sense_valid) 1378 sense_deferred = scsi_sense_is_deferred(&sshdr); 1379 } 1380 #ifdef CONFIG_SCSI_LOGGING 1381 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1382 if (sense_valid) { 1383 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1384 "sd_done: sb[respc,sk,asc," 1385 "ascq]=%x,%x,%x,%x\n", 1386 sshdr.response_code, 1387 sshdr.sense_key, sshdr.asc, 1388 sshdr.ascq)); 1389 } 1390 #endif 1391 if (driver_byte(result) != DRIVER_SENSE && 1392 (!sense_valid || sense_deferred)) 1393 goto out; 1394 1395 switch (sshdr.sense_key) { 1396 case HARDWARE_ERROR: 1397 case MEDIUM_ERROR: 1398 good_bytes = sd_completed_bytes(SCpnt); 1399 break; 1400 case RECOVERED_ERROR: 1401 good_bytes = scsi_bufflen(SCpnt); 1402 break; 1403 case NO_SENSE: 1404 /* This indicates a false check condition, so ignore it. An 1405 * unknown amount of data was transferred so treat it as an 1406 * error. 1407 */ 1408 scsi_print_sense("sd", SCpnt); 1409 SCpnt->result = 0; 1410 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1411 break; 1412 case ABORTED_COMMAND: 1413 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ 1414 good_bytes = sd_completed_bytes(SCpnt); 1415 break; 1416 case ILLEGAL_REQUEST: 1417 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */ 1418 good_bytes = sd_completed_bytes(SCpnt); 1419 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ 1420 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1421 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME)) 1422 sd_config_discard(sdkp, SD_LBP_DISABLE); 1423 break; 1424 default: 1425 break; 1426 } 1427 out: 1428 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1429 sd_dif_complete(SCpnt, good_bytes); 1430 1431 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) 1432 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { 1433 1434 /* We have to print a failed command here as the 1435 * extended CDB gets freed before scsi_io_completion() 1436 * is called. 1437 */ 1438 if (result) 1439 scsi_print_command(SCpnt); 1440 1441 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1442 SCpnt->cmnd = NULL; 1443 SCpnt->cmd_len = 0; 1444 } 1445 1446 return good_bytes; 1447 } 1448 1449 /* 1450 * spinup disk - called only in sd_revalidate_disk() 1451 */ 1452 static void 1453 sd_spinup_disk(struct scsi_disk *sdkp) 1454 { 1455 unsigned char cmd[10]; 1456 unsigned long spintime_expire = 0; 1457 int retries, spintime; 1458 unsigned int the_result; 1459 struct scsi_sense_hdr sshdr; 1460 int sense_valid = 0; 1461 1462 spintime = 0; 1463 1464 /* Spin up drives, as required. Only do this at boot time */ 1465 /* Spinup needs to be done for module loads too. */ 1466 do { 1467 retries = 0; 1468 1469 do { 1470 cmd[0] = TEST_UNIT_READY; 1471 memset((void *) &cmd[1], 0, 9); 1472 1473 the_result = scsi_execute_req(sdkp->device, cmd, 1474 DMA_NONE, NULL, 0, 1475 &sshdr, SD_TIMEOUT, 1476 SD_MAX_RETRIES, NULL); 1477 1478 /* 1479 * If the drive has indicated to us that it 1480 * doesn't have any media in it, don't bother 1481 * with any more polling. 1482 */ 1483 if (media_not_present(sdkp, &sshdr)) 1484 return; 1485 1486 if (the_result) 1487 sense_valid = scsi_sense_valid(&sshdr); 1488 retries++; 1489 } while (retries < 3 && 1490 (!scsi_status_is_good(the_result) || 1491 ((driver_byte(the_result) & DRIVER_SENSE) && 1492 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1493 1494 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1495 /* no sense, TUR either succeeded or failed 1496 * with a status error */ 1497 if(!spintime && !scsi_status_is_good(the_result)) { 1498 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1499 sd_print_result(sdkp, the_result); 1500 } 1501 break; 1502 } 1503 1504 /* 1505 * The device does not want the automatic start to be issued. 1506 */ 1507 if (sdkp->device->no_start_on_add) 1508 break; 1509 1510 if (sense_valid && sshdr.sense_key == NOT_READY) { 1511 if (sshdr.asc == 4 && sshdr.ascq == 3) 1512 break; /* manual intervention required */ 1513 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1514 break; /* standby */ 1515 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1516 break; /* unavailable */ 1517 /* 1518 * Issue command to spin up drive when not ready 1519 */ 1520 if (!spintime) { 1521 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1522 cmd[0] = START_STOP; 1523 cmd[1] = 1; /* Return immediately */ 1524 memset((void *) &cmd[2], 0, 8); 1525 cmd[4] = 1; /* Start spin cycle */ 1526 if (sdkp->device->start_stop_pwr_cond) 1527 cmd[4] |= 1 << 4; 1528 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1529 NULL, 0, &sshdr, 1530 SD_TIMEOUT, SD_MAX_RETRIES, 1531 NULL); 1532 spintime_expire = jiffies + 100 * HZ; 1533 spintime = 1; 1534 } 1535 /* Wait 1 second for next try */ 1536 msleep(1000); 1537 printk("."); 1538 1539 /* 1540 * Wait for USB flash devices with slow firmware. 1541 * Yes, this sense key/ASC combination shouldn't 1542 * occur here. It's characteristic of these devices. 1543 */ 1544 } else if (sense_valid && 1545 sshdr.sense_key == UNIT_ATTENTION && 1546 sshdr.asc == 0x28) { 1547 if (!spintime) { 1548 spintime_expire = jiffies + 5 * HZ; 1549 spintime = 1; 1550 } 1551 /* Wait 1 second for next try */ 1552 msleep(1000); 1553 } else { 1554 /* we don't understand the sense code, so it's 1555 * probably pointless to loop */ 1556 if(!spintime) { 1557 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1558 sd_print_sense_hdr(sdkp, &sshdr); 1559 } 1560 break; 1561 } 1562 1563 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1564 1565 if (spintime) { 1566 if (scsi_status_is_good(the_result)) 1567 printk("ready\n"); 1568 else 1569 printk("not responding...\n"); 1570 } 1571 } 1572 1573 1574 /* 1575 * Determine whether disk supports Data Integrity Field. 1576 */ 1577 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1578 { 1579 struct scsi_device *sdp = sdkp->device; 1580 u8 type; 1581 1582 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1583 return; 1584 1585 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1586 1587 if (type == sdkp->protection_type || !sdkp->first_scan) 1588 return; 1589 1590 sdkp->protection_type = type; 1591 1592 if (type > SD_DIF_TYPE3_PROTECTION) { 1593 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \ 1594 "protection type %u. Disabling disk!\n", type); 1595 sdkp->capacity = 0; 1596 return; 1597 } 1598 1599 if (scsi_host_dif_capable(sdp->host, type)) 1600 sd_printk(KERN_NOTICE, sdkp, 1601 "Enabling DIF Type %u protection\n", type); 1602 else 1603 sd_printk(KERN_NOTICE, sdkp, 1604 "Disabling DIF Type %u protection\n", type); 1605 } 1606 1607 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1608 struct scsi_sense_hdr *sshdr, int sense_valid, 1609 int the_result) 1610 { 1611 sd_print_result(sdkp, the_result); 1612 if (driver_byte(the_result) & DRIVER_SENSE) 1613 sd_print_sense_hdr(sdkp, sshdr); 1614 else 1615 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1616 1617 /* 1618 * Set dirty bit for removable devices if not ready - 1619 * sometimes drives will not report this properly. 1620 */ 1621 if (sdp->removable && 1622 sense_valid && sshdr->sense_key == NOT_READY) 1623 set_media_not_present(sdkp); 1624 1625 /* 1626 * We used to set media_present to 0 here to indicate no media 1627 * in the drive, but some drives fail read capacity even with 1628 * media present, so we can't do that. 1629 */ 1630 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1631 } 1632 1633 #define RC16_LEN 32 1634 #if RC16_LEN > SD_BUF_SIZE 1635 #error RC16_LEN must not be more than SD_BUF_SIZE 1636 #endif 1637 1638 #define READ_CAPACITY_RETRIES_ON_RESET 10 1639 1640 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1641 unsigned char *buffer) 1642 { 1643 unsigned char cmd[16]; 1644 struct scsi_sense_hdr sshdr; 1645 int sense_valid = 0; 1646 int the_result; 1647 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1648 unsigned int alignment; 1649 unsigned long long lba; 1650 unsigned sector_size; 1651 1652 if (sdp->no_read_capacity_16) 1653 return -EINVAL; 1654 1655 do { 1656 memset(cmd, 0, 16); 1657 cmd[0] = SERVICE_ACTION_IN; 1658 cmd[1] = SAI_READ_CAPACITY_16; 1659 cmd[13] = RC16_LEN; 1660 memset(buffer, 0, RC16_LEN); 1661 1662 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1663 buffer, RC16_LEN, &sshdr, 1664 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1665 1666 if (media_not_present(sdkp, &sshdr)) 1667 return -ENODEV; 1668 1669 if (the_result) { 1670 sense_valid = scsi_sense_valid(&sshdr); 1671 if (sense_valid && 1672 sshdr.sense_key == ILLEGAL_REQUEST && 1673 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1674 sshdr.ascq == 0x00) 1675 /* Invalid Command Operation Code or 1676 * Invalid Field in CDB, just retry 1677 * silently with RC10 */ 1678 return -EINVAL; 1679 if (sense_valid && 1680 sshdr.sense_key == UNIT_ATTENTION && 1681 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1682 /* Device reset might occur several times, 1683 * give it one more chance */ 1684 if (--reset_retries > 0) 1685 continue; 1686 } 1687 retries--; 1688 1689 } while (the_result && retries); 1690 1691 if (the_result) { 1692 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1693 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1694 return -EINVAL; 1695 } 1696 1697 sector_size = get_unaligned_be32(&buffer[8]); 1698 lba = get_unaligned_be64(&buffer[0]); 1699 1700 sd_read_protection_type(sdkp, buffer); 1701 1702 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1703 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1704 "kernel compiled with support for large block " 1705 "devices.\n"); 1706 sdkp->capacity = 0; 1707 return -EOVERFLOW; 1708 } 1709 1710 /* Logical blocks per physical block exponent */ 1711 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; 1712 1713 /* Lowest aligned logical block */ 1714 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 1715 blk_queue_alignment_offset(sdp->request_queue, alignment); 1716 if (alignment && sdkp->first_scan) 1717 sd_printk(KERN_NOTICE, sdkp, 1718 "physical block alignment offset: %u\n", alignment); 1719 1720 if (buffer[14] & 0x80) { /* LBPME */ 1721 sdkp->lbpme = 1; 1722 1723 if (buffer[14] & 0x40) /* LBPRZ */ 1724 sdkp->lbprz = 1; 1725 1726 sd_config_discard(sdkp, SD_LBP_WS16); 1727 } 1728 1729 sdkp->capacity = lba + 1; 1730 return sector_size; 1731 } 1732 1733 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 1734 unsigned char *buffer) 1735 { 1736 unsigned char cmd[16]; 1737 struct scsi_sense_hdr sshdr; 1738 int sense_valid = 0; 1739 int the_result; 1740 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1741 sector_t lba; 1742 unsigned sector_size; 1743 1744 do { 1745 cmd[0] = READ_CAPACITY; 1746 memset(&cmd[1], 0, 9); 1747 memset(buffer, 0, 8); 1748 1749 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1750 buffer, 8, &sshdr, 1751 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1752 1753 if (media_not_present(sdkp, &sshdr)) 1754 return -ENODEV; 1755 1756 if (the_result) { 1757 sense_valid = scsi_sense_valid(&sshdr); 1758 if (sense_valid && 1759 sshdr.sense_key == UNIT_ATTENTION && 1760 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1761 /* Device reset might occur several times, 1762 * give it one more chance */ 1763 if (--reset_retries > 0) 1764 continue; 1765 } 1766 retries--; 1767 1768 } while (the_result && retries); 1769 1770 if (the_result) { 1771 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1772 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1773 return -EINVAL; 1774 } 1775 1776 sector_size = get_unaligned_be32(&buffer[4]); 1777 lba = get_unaligned_be32(&buffer[0]); 1778 1779 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { 1780 /* Some buggy (usb cardreader) devices return an lba of 1781 0xffffffff when the want to report a size of 0 (with 1782 which they really mean no media is present) */ 1783 sdkp->capacity = 0; 1784 sdkp->physical_block_size = sector_size; 1785 return sector_size; 1786 } 1787 1788 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 1789 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1790 "kernel compiled with support for large block " 1791 "devices.\n"); 1792 sdkp->capacity = 0; 1793 return -EOVERFLOW; 1794 } 1795 1796 sdkp->capacity = lba + 1; 1797 sdkp->physical_block_size = sector_size; 1798 return sector_size; 1799 } 1800 1801 static int sd_try_rc16_first(struct scsi_device *sdp) 1802 { 1803 if (sdp->host->max_cmd_len < 16) 1804 return 0; 1805 if (sdp->scsi_level > SCSI_SPC_2) 1806 return 1; 1807 if (scsi_device_protection(sdp)) 1808 return 1; 1809 return 0; 1810 } 1811 1812 /* 1813 * read disk capacity 1814 */ 1815 static void 1816 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1817 { 1818 int sector_size; 1819 struct scsi_device *sdp = sdkp->device; 1820 sector_t old_capacity = sdkp->capacity; 1821 1822 if (sd_try_rc16_first(sdp)) { 1823 sector_size = read_capacity_16(sdkp, sdp, buffer); 1824 if (sector_size == -EOVERFLOW) 1825 goto got_data; 1826 if (sector_size == -ENODEV) 1827 return; 1828 if (sector_size < 0) 1829 sector_size = read_capacity_10(sdkp, sdp, buffer); 1830 if (sector_size < 0) 1831 return; 1832 } else { 1833 sector_size = read_capacity_10(sdkp, sdp, buffer); 1834 if (sector_size == -EOVERFLOW) 1835 goto got_data; 1836 if (sector_size < 0) 1837 return; 1838 if ((sizeof(sdkp->capacity) > 4) && 1839 (sdkp->capacity > 0xffffffffULL)) { 1840 int old_sector_size = sector_size; 1841 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1842 "Trying to use READ CAPACITY(16).\n"); 1843 sector_size = read_capacity_16(sdkp, sdp, buffer); 1844 if (sector_size < 0) { 1845 sd_printk(KERN_NOTICE, sdkp, 1846 "Using 0xffffffff as device size\n"); 1847 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1848 sector_size = old_sector_size; 1849 goto got_data; 1850 } 1851 } 1852 } 1853 1854 /* Some devices are known to return the total number of blocks, 1855 * not the highest block number. Some devices have versions 1856 * which do this and others which do not. Some devices we might 1857 * suspect of doing this but we don't know for certain. 1858 * 1859 * If we know the reported capacity is wrong, decrement it. If 1860 * we can only guess, then assume the number of blocks is even 1861 * (usually true but not always) and err on the side of lowering 1862 * the capacity. 1863 */ 1864 if (sdp->fix_capacity || 1865 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 1866 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 1867 "from its reported value: %llu\n", 1868 (unsigned long long) sdkp->capacity); 1869 --sdkp->capacity; 1870 } 1871 1872 got_data: 1873 if (sector_size == 0) { 1874 sector_size = 512; 1875 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1876 "assuming 512.\n"); 1877 } 1878 1879 if (sector_size != 512 && 1880 sector_size != 1024 && 1881 sector_size != 2048 && 1882 sector_size != 4096 && 1883 sector_size != 256) { 1884 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1885 sector_size); 1886 /* 1887 * The user might want to re-format the drive with 1888 * a supported sectorsize. Once this happens, it 1889 * would be relatively trivial to set the thing up. 1890 * For this reason, we leave the thing in the table. 1891 */ 1892 sdkp->capacity = 0; 1893 /* 1894 * set a bogus sector size so the normal read/write 1895 * logic in the block layer will eventually refuse any 1896 * request on this device without tripping over power 1897 * of two sector size assumptions 1898 */ 1899 sector_size = 512; 1900 } 1901 blk_queue_logical_block_size(sdp->request_queue, sector_size); 1902 1903 { 1904 char cap_str_2[10], cap_str_10[10]; 1905 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 1906 1907 string_get_size(sz, STRING_UNITS_2, cap_str_2, 1908 sizeof(cap_str_2)); 1909 string_get_size(sz, STRING_UNITS_10, cap_str_10, 1910 sizeof(cap_str_10)); 1911 1912 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 1913 sd_printk(KERN_NOTICE, sdkp, 1914 "%llu %d-byte logical blocks: (%s/%s)\n", 1915 (unsigned long long)sdkp->capacity, 1916 sector_size, cap_str_10, cap_str_2); 1917 1918 if (sdkp->physical_block_size != sector_size) 1919 sd_printk(KERN_NOTICE, sdkp, 1920 "%u-byte physical blocks\n", 1921 sdkp->physical_block_size); 1922 } 1923 } 1924 1925 /* Rescale capacity to 512-byte units */ 1926 if (sector_size == 4096) 1927 sdkp->capacity <<= 3; 1928 else if (sector_size == 2048) 1929 sdkp->capacity <<= 2; 1930 else if (sector_size == 1024) 1931 sdkp->capacity <<= 1; 1932 else if (sector_size == 256) 1933 sdkp->capacity >>= 1; 1934 1935 blk_queue_physical_block_size(sdp->request_queue, 1936 sdkp->physical_block_size); 1937 sdkp->device->sector_size = sector_size; 1938 } 1939 1940 /* called with buffer of length 512 */ 1941 static inline int 1942 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1943 unsigned char *buffer, int len, struct scsi_mode_data *data, 1944 struct scsi_sense_hdr *sshdr) 1945 { 1946 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1947 SD_TIMEOUT, SD_MAX_RETRIES, data, 1948 sshdr); 1949 } 1950 1951 /* 1952 * read write protect setting, if possible - called only in sd_revalidate_disk() 1953 * called with buffer of length SD_BUF_SIZE 1954 */ 1955 static void 1956 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1957 { 1958 int res; 1959 struct scsi_device *sdp = sdkp->device; 1960 struct scsi_mode_data data; 1961 int old_wp = sdkp->write_prot; 1962 1963 set_disk_ro(sdkp->disk, 0); 1964 if (sdp->skip_ms_page_3f) { 1965 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1966 return; 1967 } 1968 1969 if (sdp->use_192_bytes_for_3f) { 1970 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1971 } else { 1972 /* 1973 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1974 * We have to start carefully: some devices hang if we ask 1975 * for more than is available. 1976 */ 1977 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1978 1979 /* 1980 * Second attempt: ask for page 0 When only page 0 is 1981 * implemented, a request for page 3F may return Sense Key 1982 * 5: Illegal Request, Sense Code 24: Invalid field in 1983 * CDB. 1984 */ 1985 if (!scsi_status_is_good(res)) 1986 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1987 1988 /* 1989 * Third attempt: ask 255 bytes, as we did earlier. 1990 */ 1991 if (!scsi_status_is_good(res)) 1992 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1993 &data, NULL); 1994 } 1995 1996 if (!scsi_status_is_good(res)) { 1997 sd_printk(KERN_WARNING, sdkp, 1998 "Test WP failed, assume Write Enabled\n"); 1999 } else { 2000 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 2001 set_disk_ro(sdkp->disk, sdkp->write_prot); 2002 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 2003 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 2004 sdkp->write_prot ? "on" : "off"); 2005 sd_printk(KERN_DEBUG, sdkp, 2006 "Mode Sense: %02x %02x %02x %02x\n", 2007 buffer[0], buffer[1], buffer[2], buffer[3]); 2008 } 2009 } 2010 } 2011 2012 /* 2013 * sd_read_cache_type - called only from sd_revalidate_disk() 2014 * called with buffer of length SD_BUF_SIZE 2015 */ 2016 static void 2017 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 2018 { 2019 int len = 0, res; 2020 struct scsi_device *sdp = sdkp->device; 2021 2022 int dbd; 2023 int modepage; 2024 struct scsi_mode_data data; 2025 struct scsi_sense_hdr sshdr; 2026 int old_wce = sdkp->WCE; 2027 int old_rcd = sdkp->RCD; 2028 int old_dpofua = sdkp->DPOFUA; 2029 2030 if (sdp->skip_ms_page_8) 2031 goto defaults; 2032 2033 if (sdp->type == TYPE_RBC) { 2034 modepage = 6; 2035 dbd = 8; 2036 } else { 2037 modepage = 8; 2038 dbd = 0; 2039 } 2040 2041 /* cautiously ask */ 2042 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 2043 2044 if (!scsi_status_is_good(res)) 2045 goto bad_sense; 2046 2047 if (!data.header_length) { 2048 modepage = 6; 2049 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 2050 } 2051 2052 /* that went OK, now ask for the proper length */ 2053 len = data.length; 2054 2055 /* 2056 * We're only interested in the first three bytes, actually. 2057 * But the data cache page is defined for the first 20. 2058 */ 2059 if (len < 3) 2060 goto bad_sense; 2061 if (len > 20) 2062 len = 20; 2063 2064 /* Take headers and block descriptors into account */ 2065 len += data.header_length + data.block_descriptor_length; 2066 if (len > SD_BUF_SIZE) 2067 goto bad_sense; 2068 2069 /* Get the data */ 2070 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 2071 2072 if (scsi_status_is_good(res)) { 2073 int offset = data.header_length + data.block_descriptor_length; 2074 2075 if (offset >= SD_BUF_SIZE - 2) { 2076 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 2077 goto defaults; 2078 } 2079 2080 if ((buffer[offset] & 0x3f) != modepage) { 2081 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 2082 goto defaults; 2083 } 2084 2085 if (modepage == 8) { 2086 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 2087 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 2088 } else { 2089 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 2090 sdkp->RCD = 0; 2091 } 2092 2093 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 2094 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 2095 sd_printk(KERN_NOTICE, sdkp, 2096 "Uses READ/WRITE(6), disabling FUA\n"); 2097 sdkp->DPOFUA = 0; 2098 } 2099 2100 if (sdkp->first_scan || old_wce != sdkp->WCE || 2101 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 2102 sd_printk(KERN_NOTICE, sdkp, 2103 "Write cache: %s, read cache: %s, %s\n", 2104 sdkp->WCE ? "enabled" : "disabled", 2105 sdkp->RCD ? "disabled" : "enabled", 2106 sdkp->DPOFUA ? "supports DPO and FUA" 2107 : "doesn't support DPO or FUA"); 2108 2109 return; 2110 } 2111 2112 bad_sense: 2113 if (scsi_sense_valid(&sshdr) && 2114 sshdr.sense_key == ILLEGAL_REQUEST && 2115 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 2116 /* Invalid field in CDB */ 2117 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 2118 else 2119 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 2120 2121 defaults: 2122 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 2123 sdkp->WCE = 0; 2124 sdkp->RCD = 0; 2125 sdkp->DPOFUA = 0; 2126 } 2127 2128 /* 2129 * The ATO bit indicates whether the DIF application tag is available 2130 * for use by the operating system. 2131 */ 2132 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 2133 { 2134 int res, offset; 2135 struct scsi_device *sdp = sdkp->device; 2136 struct scsi_mode_data data; 2137 struct scsi_sense_hdr sshdr; 2138 2139 if (sdp->type != TYPE_DISK) 2140 return; 2141 2142 if (sdkp->protection_type == 0) 2143 return; 2144 2145 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 2146 SD_MAX_RETRIES, &data, &sshdr); 2147 2148 if (!scsi_status_is_good(res) || !data.header_length || 2149 data.length < 6) { 2150 sd_printk(KERN_WARNING, sdkp, 2151 "getting Control mode page failed, assume no ATO\n"); 2152 2153 if (scsi_sense_valid(&sshdr)) 2154 sd_print_sense_hdr(sdkp, &sshdr); 2155 2156 return; 2157 } 2158 2159 offset = data.header_length + data.block_descriptor_length; 2160 2161 if ((buffer[offset] & 0x3f) != 0x0a) { 2162 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2163 return; 2164 } 2165 2166 if ((buffer[offset + 5] & 0x80) == 0) 2167 return; 2168 2169 sdkp->ATO = 1; 2170 2171 return; 2172 } 2173 2174 /** 2175 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2176 * @disk: disk to query 2177 */ 2178 static void sd_read_block_limits(struct scsi_disk *sdkp) 2179 { 2180 unsigned int sector_sz = sdkp->device->sector_size; 2181 const int vpd_len = 64; 2182 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2183 2184 if (!buffer || 2185 /* Block Limits VPD */ 2186 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2187 goto out; 2188 2189 blk_queue_io_min(sdkp->disk->queue, 2190 get_unaligned_be16(&buffer[6]) * sector_sz); 2191 blk_queue_io_opt(sdkp->disk->queue, 2192 get_unaligned_be32(&buffer[12]) * sector_sz); 2193 2194 if (buffer[3] == 0x3c) { 2195 unsigned int lba_count, desc_count; 2196 2197 sdkp->max_ws_blocks = 2198 (u32) min_not_zero(get_unaligned_be64(&buffer[36]), 2199 (u64)0xffffffff); 2200 2201 if (!sdkp->lbpme) 2202 goto out; 2203 2204 lba_count = get_unaligned_be32(&buffer[20]); 2205 desc_count = get_unaligned_be32(&buffer[24]); 2206 2207 if (lba_count && desc_count) 2208 sdkp->max_unmap_blocks = lba_count; 2209 2210 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); 2211 2212 if (buffer[32] & 0x80) 2213 sdkp->unmap_alignment = 2214 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2215 2216 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ 2217 2218 if (sdkp->max_unmap_blocks) 2219 sd_config_discard(sdkp, SD_LBP_UNMAP); 2220 else 2221 sd_config_discard(sdkp, SD_LBP_WS16); 2222 2223 } else { /* LBP VPD page tells us what to use */ 2224 2225 if (sdkp->lbpu && sdkp->max_unmap_blocks) 2226 sd_config_discard(sdkp, SD_LBP_UNMAP); 2227 else if (sdkp->lbpws) 2228 sd_config_discard(sdkp, SD_LBP_WS16); 2229 else if (sdkp->lbpws10) 2230 sd_config_discard(sdkp, SD_LBP_WS10); 2231 else 2232 sd_config_discard(sdkp, SD_LBP_DISABLE); 2233 } 2234 } 2235 2236 out: 2237 kfree(buffer); 2238 } 2239 2240 /** 2241 * sd_read_block_characteristics - Query block dev. characteristics 2242 * @disk: disk to query 2243 */ 2244 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2245 { 2246 unsigned char *buffer; 2247 u16 rot; 2248 const int vpd_len = 64; 2249 2250 buffer = kmalloc(vpd_len, GFP_KERNEL); 2251 2252 if (!buffer || 2253 /* Block Device Characteristics VPD */ 2254 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2255 goto out; 2256 2257 rot = get_unaligned_be16(&buffer[4]); 2258 2259 if (rot == 1) 2260 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2261 2262 out: 2263 kfree(buffer); 2264 } 2265 2266 /** 2267 * sd_read_block_provisioning - Query provisioning VPD page 2268 * @disk: disk to query 2269 */ 2270 static void sd_read_block_provisioning(struct scsi_disk *sdkp) 2271 { 2272 unsigned char *buffer; 2273 const int vpd_len = 8; 2274 2275 if (sdkp->lbpme == 0) 2276 return; 2277 2278 buffer = kmalloc(vpd_len, GFP_KERNEL); 2279 2280 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) 2281 goto out; 2282 2283 sdkp->lbpvpd = 1; 2284 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ 2285 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ 2286 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ 2287 2288 out: 2289 kfree(buffer); 2290 } 2291 2292 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2293 { 2294 /* 2295 * Although VPD inquiries can go to SCSI-2 type devices, 2296 * some USB ones crash on receiving them, and the pages 2297 * we currently ask for are for SPC-3 and beyond 2298 */ 2299 if (sdp->scsi_level > SCSI_SPC_2) 2300 return 1; 2301 return 0; 2302 } 2303 2304 /** 2305 * sd_revalidate_disk - called the first time a new disk is seen, 2306 * performs disk spin up, read_capacity, etc. 2307 * @disk: struct gendisk we care about 2308 **/ 2309 static int sd_revalidate_disk(struct gendisk *disk) 2310 { 2311 struct scsi_disk *sdkp = scsi_disk(disk); 2312 struct scsi_device *sdp = sdkp->device; 2313 unsigned char *buffer; 2314 unsigned flush = 0; 2315 2316 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2317 "sd_revalidate_disk\n")); 2318 2319 /* 2320 * If the device is offline, don't try and read capacity or any 2321 * of the other niceties. 2322 */ 2323 if (!scsi_device_online(sdp)) 2324 goto out; 2325 2326 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2327 if (!buffer) { 2328 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2329 "allocation failure.\n"); 2330 goto out; 2331 } 2332 2333 sd_spinup_disk(sdkp); 2334 2335 /* 2336 * Without media there is no reason to ask; moreover, some devices 2337 * react badly if we do. 2338 */ 2339 if (sdkp->media_present) { 2340 sd_read_capacity(sdkp, buffer); 2341 2342 if (sd_try_extended_inquiry(sdp)) { 2343 sd_read_block_provisioning(sdkp); 2344 sd_read_block_limits(sdkp); 2345 sd_read_block_characteristics(sdkp); 2346 } 2347 2348 sd_read_write_protect_flag(sdkp, buffer); 2349 sd_read_cache_type(sdkp, buffer); 2350 sd_read_app_tag_own(sdkp, buffer); 2351 } 2352 2353 sdkp->first_scan = 0; 2354 2355 /* 2356 * We now have all cache related info, determine how we deal 2357 * with flush requests. 2358 */ 2359 if (sdkp->WCE) { 2360 flush |= REQ_FLUSH; 2361 if (sdkp->DPOFUA) 2362 flush |= REQ_FUA; 2363 } 2364 2365 blk_queue_flush(sdkp->disk->queue, flush); 2366 2367 set_capacity(disk, sdkp->capacity); 2368 kfree(buffer); 2369 2370 out: 2371 return 0; 2372 } 2373 2374 /** 2375 * sd_unlock_native_capacity - unlock native capacity 2376 * @disk: struct gendisk to set capacity for 2377 * 2378 * Block layer calls this function if it detects that partitions 2379 * on @disk reach beyond the end of the device. If the SCSI host 2380 * implements ->unlock_native_capacity() method, it's invoked to 2381 * give it a chance to adjust the device capacity. 2382 * 2383 * CONTEXT: 2384 * Defined by block layer. Might sleep. 2385 */ 2386 static void sd_unlock_native_capacity(struct gendisk *disk) 2387 { 2388 struct scsi_device *sdev = scsi_disk(disk)->device; 2389 2390 if (sdev->host->hostt->unlock_native_capacity) 2391 sdev->host->hostt->unlock_native_capacity(sdev); 2392 } 2393 2394 /** 2395 * sd_format_disk_name - format disk name 2396 * @prefix: name prefix - ie. "sd" for SCSI disks 2397 * @index: index of the disk to format name for 2398 * @buf: output buffer 2399 * @buflen: length of the output buffer 2400 * 2401 * SCSI disk names starts at sda. The 26th device is sdz and the 2402 * 27th is sdaa. The last one for two lettered suffix is sdzz 2403 * which is followed by sdaaa. 2404 * 2405 * This is basically 26 base counting with one extra 'nil' entry 2406 * at the beginning from the second digit on and can be 2407 * determined using similar method as 26 base conversion with the 2408 * index shifted -1 after each digit is computed. 2409 * 2410 * CONTEXT: 2411 * Don't care. 2412 * 2413 * RETURNS: 2414 * 0 on success, -errno on failure. 2415 */ 2416 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2417 { 2418 const int base = 'z' - 'a' + 1; 2419 char *begin = buf + strlen(prefix); 2420 char *end = buf + buflen; 2421 char *p; 2422 int unit; 2423 2424 p = end - 1; 2425 *p = '\0'; 2426 unit = base; 2427 do { 2428 if (p == begin) 2429 return -EINVAL; 2430 *--p = 'a' + (index % unit); 2431 index = (index / unit) - 1; 2432 } while (index >= 0); 2433 2434 memmove(begin, p, end - p); 2435 memcpy(buf, prefix, strlen(prefix)); 2436 2437 return 0; 2438 } 2439 2440 /* 2441 * The asynchronous part of sd_probe 2442 */ 2443 static void sd_probe_async(void *data, async_cookie_t cookie) 2444 { 2445 struct scsi_disk *sdkp = data; 2446 struct scsi_device *sdp; 2447 struct gendisk *gd; 2448 u32 index; 2449 struct device *dev; 2450 2451 sdp = sdkp->device; 2452 gd = sdkp->disk; 2453 index = sdkp->index; 2454 dev = &sdp->sdev_gendev; 2455 2456 gd->major = sd_major((index & 0xf0) >> 4); 2457 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2458 gd->minors = SD_MINORS; 2459 2460 gd->fops = &sd_fops; 2461 gd->private_data = &sdkp->driver; 2462 gd->queue = sdkp->device->request_queue; 2463 2464 /* defaults, until the device tells us otherwise */ 2465 sdp->sector_size = 512; 2466 sdkp->capacity = 0; 2467 sdkp->media_present = 1; 2468 sdkp->write_prot = 0; 2469 sdkp->WCE = 0; 2470 sdkp->RCD = 0; 2471 sdkp->ATO = 0; 2472 sdkp->first_scan = 1; 2473 2474 sd_revalidate_disk(gd); 2475 2476 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2477 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn); 2478 2479 gd->driverfs_dev = &sdp->sdev_gendev; 2480 gd->flags = GENHD_FL_EXT_DEVT; 2481 if (sdp->removable) { 2482 gd->flags |= GENHD_FL_REMOVABLE; 2483 gd->events |= DISK_EVENT_MEDIA_CHANGE; 2484 } 2485 2486 add_disk(gd); 2487 sd_dif_config_host(sdkp); 2488 2489 sd_revalidate_disk(gd); 2490 2491 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2492 sdp->removable ? "removable " : ""); 2493 scsi_autopm_put_device(sdp); 2494 put_device(&sdkp->dev); 2495 } 2496 2497 /** 2498 * sd_probe - called during driver initialization and whenever a 2499 * new scsi device is attached to the system. It is called once 2500 * for each scsi device (not just disks) present. 2501 * @dev: pointer to device object 2502 * 2503 * Returns 0 if successful (or not interested in this scsi device 2504 * (e.g. scanner)); 1 when there is an error. 2505 * 2506 * Note: this function is invoked from the scsi mid-level. 2507 * This function sets up the mapping between a given 2508 * <host,channel,id,lun> (found in sdp) and new device name 2509 * (e.g. /dev/sda). More precisely it is the block device major 2510 * and minor number that is chosen here. 2511 * 2512 * Assume sd_attach is not re-entrant (for time being) 2513 * Also think about sd_attach() and sd_remove() running coincidentally. 2514 **/ 2515 static int sd_probe(struct device *dev) 2516 { 2517 struct scsi_device *sdp = to_scsi_device(dev); 2518 struct scsi_disk *sdkp; 2519 struct gendisk *gd; 2520 int index; 2521 int error; 2522 2523 error = -ENODEV; 2524 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2525 goto out; 2526 2527 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2528 "sd_attach\n")); 2529 2530 error = -ENOMEM; 2531 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2532 if (!sdkp) 2533 goto out; 2534 2535 gd = alloc_disk(SD_MINORS); 2536 if (!gd) 2537 goto out_free; 2538 2539 do { 2540 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2541 goto out_put; 2542 2543 spin_lock(&sd_index_lock); 2544 error = ida_get_new(&sd_index_ida, &index); 2545 spin_unlock(&sd_index_lock); 2546 } while (error == -EAGAIN); 2547 2548 if (error) 2549 goto out_put; 2550 2551 if (index >= SD_MAX_DISKS) { 2552 error = -ENODEV; 2553 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name space exhausted.\n"); 2554 goto out_free_index; 2555 } 2556 2557 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2558 if (error) 2559 goto out_free_index; 2560 2561 sdkp->device = sdp; 2562 sdkp->driver = &sd_template; 2563 sdkp->disk = gd; 2564 sdkp->index = index; 2565 atomic_set(&sdkp->openers, 0); 2566 2567 if (!sdp->request_queue->rq_timeout) { 2568 if (sdp->type != TYPE_MOD) 2569 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2570 else 2571 blk_queue_rq_timeout(sdp->request_queue, 2572 SD_MOD_TIMEOUT); 2573 } 2574 2575 device_initialize(&sdkp->dev); 2576 sdkp->dev.parent = dev; 2577 sdkp->dev.class = &sd_disk_class; 2578 dev_set_name(&sdkp->dev, dev_name(dev)); 2579 2580 if (device_add(&sdkp->dev)) 2581 goto out_free_index; 2582 2583 get_device(dev); 2584 dev_set_drvdata(dev, sdkp); 2585 2586 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2587 async_schedule(sd_probe_async, sdkp); 2588 2589 return 0; 2590 2591 out_free_index: 2592 spin_lock(&sd_index_lock); 2593 ida_remove(&sd_index_ida, index); 2594 spin_unlock(&sd_index_lock); 2595 out_put: 2596 put_disk(gd); 2597 out_free: 2598 kfree(sdkp); 2599 out: 2600 return error; 2601 } 2602 2603 /** 2604 * sd_remove - called whenever a scsi disk (previously recognized by 2605 * sd_probe) is detached from the system. It is called (potentially 2606 * multiple times) during sd module unload. 2607 * @sdp: pointer to mid level scsi device object 2608 * 2609 * Note: this function is invoked from the scsi mid-level. 2610 * This function potentially frees up a device name (e.g. /dev/sdc) 2611 * that could be re-used by a subsequent sd_probe(). 2612 * This function is not called when the built-in sd driver is "exit-ed". 2613 **/ 2614 static int sd_remove(struct device *dev) 2615 { 2616 struct scsi_disk *sdkp; 2617 2618 sdkp = dev_get_drvdata(dev); 2619 scsi_autopm_get_device(sdkp->device); 2620 2621 async_synchronize_full(); 2622 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 2623 blk_queue_unprep_rq(sdkp->device->request_queue, NULL); 2624 device_del(&sdkp->dev); 2625 del_gendisk(sdkp->disk); 2626 sd_shutdown(dev); 2627 2628 mutex_lock(&sd_ref_mutex); 2629 dev_set_drvdata(dev, NULL); 2630 put_device(&sdkp->dev); 2631 mutex_unlock(&sd_ref_mutex); 2632 2633 return 0; 2634 } 2635 2636 /** 2637 * scsi_disk_release - Called to free the scsi_disk structure 2638 * @dev: pointer to embedded class device 2639 * 2640 * sd_ref_mutex must be held entering this routine. Because it is 2641 * called on last put, you should always use the scsi_disk_get() 2642 * scsi_disk_put() helpers which manipulate the semaphore directly 2643 * and never do a direct put_device. 2644 **/ 2645 static void scsi_disk_release(struct device *dev) 2646 { 2647 struct scsi_disk *sdkp = to_scsi_disk(dev); 2648 struct gendisk *disk = sdkp->disk; 2649 2650 spin_lock(&sd_index_lock); 2651 ida_remove(&sd_index_ida, sdkp->index); 2652 spin_unlock(&sd_index_lock); 2653 2654 disk->private_data = NULL; 2655 put_disk(disk); 2656 put_device(&sdkp->device->sdev_gendev); 2657 2658 kfree(sdkp); 2659 } 2660 2661 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 2662 { 2663 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 2664 struct scsi_sense_hdr sshdr; 2665 struct scsi_device *sdp = sdkp->device; 2666 int res; 2667 2668 if (start) 2669 cmd[4] |= 1; /* START */ 2670 2671 if (sdp->start_stop_pwr_cond) 2672 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 2673 2674 if (!scsi_device_online(sdp)) 2675 return -ENODEV; 2676 2677 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 2678 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2679 if (res) { 2680 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 2681 sd_print_result(sdkp, res); 2682 if (driver_byte(res) & DRIVER_SENSE) 2683 sd_print_sense_hdr(sdkp, &sshdr); 2684 } 2685 2686 return res; 2687 } 2688 2689 /* 2690 * Send a SYNCHRONIZE CACHE instruction down to the device through 2691 * the normal SCSI command structure. Wait for the command to 2692 * complete. 2693 */ 2694 static void sd_shutdown(struct device *dev) 2695 { 2696 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2697 2698 if (!sdkp) 2699 return; /* this can happen */ 2700 2701 if (sdkp->WCE) { 2702 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2703 sd_sync_cache(sdkp); 2704 } 2705 2706 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 2707 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2708 sd_start_stop_device(sdkp, 0); 2709 } 2710 2711 scsi_disk_put(sdkp); 2712 } 2713 2714 static int sd_suspend(struct device *dev, pm_message_t mesg) 2715 { 2716 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2717 int ret = 0; 2718 2719 if (!sdkp) 2720 return 0; /* this can happen */ 2721 2722 if (sdkp->WCE) { 2723 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2724 ret = sd_sync_cache(sdkp); 2725 if (ret) 2726 goto done; 2727 } 2728 2729 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 2730 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2731 ret = sd_start_stop_device(sdkp, 0); 2732 } 2733 2734 done: 2735 scsi_disk_put(sdkp); 2736 return ret; 2737 } 2738 2739 static int sd_resume(struct device *dev) 2740 { 2741 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2742 int ret = 0; 2743 2744 if (!sdkp->device->manage_start_stop) 2745 goto done; 2746 2747 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 2748 ret = sd_start_stop_device(sdkp, 1); 2749 2750 done: 2751 scsi_disk_put(sdkp); 2752 return ret; 2753 } 2754 2755 /** 2756 * init_sd - entry point for this driver (both when built in or when 2757 * a module). 2758 * 2759 * Note: this function registers this driver with the scsi mid-level. 2760 **/ 2761 static int __init init_sd(void) 2762 { 2763 int majors = 0, i, err; 2764 2765 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 2766 2767 for (i = 0; i < SD_MAJORS; i++) 2768 if (register_blkdev(sd_major(i), "sd") == 0) 2769 majors++; 2770 2771 if (!majors) 2772 return -ENODEV; 2773 2774 err = class_register(&sd_disk_class); 2775 if (err) 2776 goto err_out; 2777 2778 err = scsi_register_driver(&sd_template.gendrv); 2779 if (err) 2780 goto err_out_class; 2781 2782 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 2783 0, 0, NULL); 2784 if (!sd_cdb_cache) { 2785 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 2786 goto err_out_class; 2787 } 2788 2789 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 2790 if (!sd_cdb_pool) { 2791 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 2792 goto err_out_cache; 2793 } 2794 2795 return 0; 2796 2797 err_out_cache: 2798 kmem_cache_destroy(sd_cdb_cache); 2799 2800 err_out_class: 2801 class_unregister(&sd_disk_class); 2802 err_out: 2803 for (i = 0; i < SD_MAJORS; i++) 2804 unregister_blkdev(sd_major(i), "sd"); 2805 return err; 2806 } 2807 2808 /** 2809 * exit_sd - exit point for this driver (when it is a module). 2810 * 2811 * Note: this function unregisters this driver from the scsi mid-level. 2812 **/ 2813 static void __exit exit_sd(void) 2814 { 2815 int i; 2816 2817 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 2818 2819 mempool_destroy(sd_cdb_pool); 2820 kmem_cache_destroy(sd_cdb_cache); 2821 2822 scsi_unregister_driver(&sd_template.gendrv); 2823 class_unregister(&sd_disk_class); 2824 2825 for (i = 0; i < SD_MAJORS; i++) 2826 unregister_blkdev(sd_major(i), "sd"); 2827 } 2828 2829 module_init(init_sd); 2830 module_exit(exit_sd); 2831 2832 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 2833 struct scsi_sense_hdr *sshdr) 2834 { 2835 sd_printk(KERN_INFO, sdkp, " "); 2836 scsi_show_sense_hdr(sshdr); 2837 sd_printk(KERN_INFO, sdkp, " "); 2838 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 2839 } 2840 2841 static void sd_print_result(struct scsi_disk *sdkp, int result) 2842 { 2843 sd_printk(KERN_INFO, sdkp, " "); 2844 scsi_show_result(result); 2845 } 2846 2847