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