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/smp_lock.h> 50 #include <linux/mutex.h> 51 #include <linux/string_helpers.h> 52 #include <linux/async.h> 53 #include <linux/slab.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 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_app_tag_own(struct device *dev, struct device_attribute *attr, 263 char *buf) 264 { 265 struct scsi_disk *sdkp = to_scsi_disk(dev); 266 267 return snprintf(buf, 20, "%u\n", sdkp->ATO); 268 } 269 270 static ssize_t 271 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, 272 char *buf) 273 { 274 struct scsi_disk *sdkp = to_scsi_disk(dev); 275 276 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning); 277 } 278 279 static struct device_attribute sd_disk_attrs[] = { 280 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 281 sd_store_cache_type), 282 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 283 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 284 sd_store_allow_restart), 285 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 286 sd_store_manage_start_stop), 287 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), 288 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 289 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), 290 __ATTR_NULL, 291 }; 292 293 static struct class sd_disk_class = { 294 .name = "scsi_disk", 295 .owner = THIS_MODULE, 296 .dev_release = scsi_disk_release, 297 .dev_attrs = sd_disk_attrs, 298 }; 299 300 static struct scsi_driver sd_template = { 301 .owner = THIS_MODULE, 302 .gendrv = { 303 .name = "sd", 304 .probe = sd_probe, 305 .remove = sd_remove, 306 .suspend = sd_suspend, 307 .resume = sd_resume, 308 .shutdown = sd_shutdown, 309 }, 310 .rescan = sd_rescan, 311 .done = sd_done, 312 }; 313 314 /* 315 * Device no to disk mapping: 316 * 317 * major disc2 disc p1 318 * |............|.............|....|....| <- dev_t 319 * 31 20 19 8 7 4 3 0 320 * 321 * Inside a major, we have 16k disks, however mapped non- 322 * contiguously. The first 16 disks are for major0, the next 323 * ones with major1, ... Disk 256 is for major0 again, disk 272 324 * for major1, ... 325 * As we stay compatible with our numbering scheme, we can reuse 326 * the well-know SCSI majors 8, 65--71, 136--143. 327 */ 328 static int sd_major(int major_idx) 329 { 330 switch (major_idx) { 331 case 0: 332 return SCSI_DISK0_MAJOR; 333 case 1 ... 7: 334 return SCSI_DISK1_MAJOR + major_idx - 1; 335 case 8 ... 15: 336 return SCSI_DISK8_MAJOR + major_idx - 8; 337 default: 338 BUG(); 339 return 0; /* shut up gcc */ 340 } 341 } 342 343 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 344 { 345 struct scsi_disk *sdkp = NULL; 346 347 if (disk->private_data) { 348 sdkp = scsi_disk(disk); 349 if (scsi_device_get(sdkp->device) == 0) 350 get_device(&sdkp->dev); 351 else 352 sdkp = NULL; 353 } 354 return sdkp; 355 } 356 357 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 358 { 359 struct scsi_disk *sdkp; 360 361 mutex_lock(&sd_ref_mutex); 362 sdkp = __scsi_disk_get(disk); 363 mutex_unlock(&sd_ref_mutex); 364 return sdkp; 365 } 366 367 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 368 { 369 struct scsi_disk *sdkp; 370 371 mutex_lock(&sd_ref_mutex); 372 sdkp = dev_get_drvdata(dev); 373 if (sdkp) 374 sdkp = __scsi_disk_get(sdkp->disk); 375 mutex_unlock(&sd_ref_mutex); 376 return sdkp; 377 } 378 379 static void scsi_disk_put(struct scsi_disk *sdkp) 380 { 381 struct scsi_device *sdev = sdkp->device; 382 383 mutex_lock(&sd_ref_mutex); 384 put_device(&sdkp->dev); 385 scsi_device_put(sdev); 386 mutex_unlock(&sd_ref_mutex); 387 } 388 389 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) 390 { 391 unsigned int prot_op = SCSI_PROT_NORMAL; 392 unsigned int dix = scsi_prot_sg_count(scmd); 393 394 if (scmd->sc_data_direction == DMA_FROM_DEVICE) { 395 if (dif && dix) 396 prot_op = SCSI_PROT_READ_PASS; 397 else if (dif && !dix) 398 prot_op = SCSI_PROT_READ_STRIP; 399 else if (!dif && dix) 400 prot_op = SCSI_PROT_READ_INSERT; 401 } else { 402 if (dif && dix) 403 prot_op = SCSI_PROT_WRITE_PASS; 404 else if (dif && !dix) 405 prot_op = SCSI_PROT_WRITE_INSERT; 406 else if (!dif && dix) 407 prot_op = SCSI_PROT_WRITE_STRIP; 408 } 409 410 scsi_set_prot_op(scmd, prot_op); 411 scsi_set_prot_type(scmd, dif); 412 } 413 414 /** 415 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device 416 * @sdp: scsi device to operate one 417 * @rq: Request to prepare 418 * 419 * Will issue either UNMAP or WRITE SAME(16) depending on preference 420 * indicated by target device. 421 **/ 422 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq) 423 { 424 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 425 struct bio *bio = rq->bio; 426 sector_t sector = bio->bi_sector; 427 unsigned int nr_sectors = bio_sectors(bio); 428 unsigned int len; 429 int ret; 430 struct page *page; 431 432 if (sdkp->device->sector_size == 4096) { 433 sector >>= 3; 434 nr_sectors >>= 3; 435 } 436 437 rq->timeout = SD_TIMEOUT; 438 439 memset(rq->cmd, 0, rq->cmd_len); 440 441 page = alloc_page(GFP_ATOMIC | __GFP_ZERO); 442 if (!page) 443 return BLKPREP_DEFER; 444 445 if (sdkp->unmap) { 446 char *buf = page_address(page); 447 448 rq->cmd_len = 10; 449 rq->cmd[0] = UNMAP; 450 rq->cmd[8] = 24; 451 452 put_unaligned_be16(6 + 16, &buf[0]); 453 put_unaligned_be16(16, &buf[2]); 454 put_unaligned_be64(sector, &buf[8]); 455 put_unaligned_be32(nr_sectors, &buf[16]); 456 457 len = 24; 458 } else { 459 rq->cmd_len = 16; 460 rq->cmd[0] = WRITE_SAME_16; 461 rq->cmd[1] = 0x8; /* UNMAP */ 462 put_unaligned_be64(sector, &rq->cmd[2]); 463 put_unaligned_be32(nr_sectors, &rq->cmd[10]); 464 465 len = sdkp->device->sector_size; 466 } 467 468 blk_add_request_payload(rq, page, len); 469 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 470 rq->buffer = page_address(page); 471 if (ret != BLKPREP_OK) { 472 __free_page(page); 473 rq->buffer = NULL; 474 } 475 return ret; 476 } 477 478 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq) 479 { 480 rq->timeout = SD_TIMEOUT; 481 rq->retries = SD_MAX_RETRIES; 482 rq->cmd[0] = SYNCHRONIZE_CACHE; 483 rq->cmd_len = 10; 484 485 return scsi_setup_blk_pc_cmnd(sdp, rq); 486 } 487 488 static void sd_unprep_fn(struct request_queue *q, struct request *rq) 489 { 490 if (rq->cmd_flags & REQ_DISCARD) { 491 free_page((unsigned long)rq->buffer); 492 rq->buffer = NULL; 493 } 494 } 495 496 /** 497 * sd_init_command - build a scsi (read or write) command from 498 * information in the request structure. 499 * @SCpnt: pointer to mid-level's per scsi command structure that 500 * contains request and into which the scsi command is written 501 * 502 * Returns 1 if successful and 0 if error (or cannot be done now). 503 **/ 504 static int sd_prep_fn(struct request_queue *q, struct request *rq) 505 { 506 struct scsi_cmnd *SCpnt; 507 struct scsi_device *sdp = q->queuedata; 508 struct gendisk *disk = rq->rq_disk; 509 struct scsi_disk *sdkp; 510 sector_t block = blk_rq_pos(rq); 511 sector_t threshold; 512 unsigned int this_count = blk_rq_sectors(rq); 513 int ret, host_dif; 514 unsigned char protect; 515 516 /* 517 * Discard request come in as REQ_TYPE_FS but we turn them into 518 * block PC requests to make life easier. 519 */ 520 if (rq->cmd_flags & REQ_DISCARD) { 521 ret = scsi_setup_discard_cmnd(sdp, rq); 522 goto out; 523 } else if (rq->cmd_flags & REQ_FLUSH) { 524 ret = scsi_setup_flush_cmnd(sdp, rq); 525 goto out; 526 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 527 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 528 goto out; 529 } else if (rq->cmd_type != REQ_TYPE_FS) { 530 ret = BLKPREP_KILL; 531 goto out; 532 } 533 ret = scsi_setup_fs_cmnd(sdp, rq); 534 if (ret != BLKPREP_OK) 535 goto out; 536 SCpnt = rq->special; 537 sdkp = scsi_disk(disk); 538 539 /* from here on until we're complete, any goto out 540 * is used for a killable error condition */ 541 ret = BLKPREP_KILL; 542 543 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 544 "sd_init_command: block=%llu, " 545 "count=%d\n", 546 (unsigned long long)block, 547 this_count)); 548 549 if (!sdp || !scsi_device_online(sdp) || 550 block + blk_rq_sectors(rq) > get_capacity(disk)) { 551 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 552 "Finishing %u sectors\n", 553 blk_rq_sectors(rq))); 554 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 555 "Retry with 0x%p\n", SCpnt)); 556 goto out; 557 } 558 559 if (sdp->changed) { 560 /* 561 * quietly refuse to do anything to a changed disc until 562 * the changed bit has been reset 563 */ 564 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ 565 goto out; 566 } 567 568 /* 569 * Some SD card readers can't handle multi-sector accesses which touch 570 * the last one or two hardware sectors. Split accesses as needed. 571 */ 572 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 573 (sdp->sector_size / 512); 574 575 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 576 if (block < threshold) { 577 /* Access up to the threshold but not beyond */ 578 this_count = threshold - block; 579 } else { 580 /* Access only a single hardware sector */ 581 this_count = sdp->sector_size / 512; 582 } 583 } 584 585 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 586 (unsigned long long)block)); 587 588 /* 589 * If we have a 1K hardware sectorsize, prevent access to single 590 * 512 byte sectors. In theory we could handle this - in fact 591 * the scsi cdrom driver must be able to handle this because 592 * we typically use 1K blocksizes, and cdroms typically have 593 * 2K hardware sectorsizes. Of course, things are simpler 594 * with the cdrom, since it is read-only. For performance 595 * reasons, the filesystems should be able to handle this 596 * and not force the scsi disk driver to use bounce buffers 597 * for this. 598 */ 599 if (sdp->sector_size == 1024) { 600 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 601 scmd_printk(KERN_ERR, SCpnt, 602 "Bad block number requested\n"); 603 goto out; 604 } else { 605 block = block >> 1; 606 this_count = this_count >> 1; 607 } 608 } 609 if (sdp->sector_size == 2048) { 610 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 611 scmd_printk(KERN_ERR, SCpnt, 612 "Bad block number requested\n"); 613 goto out; 614 } else { 615 block = block >> 2; 616 this_count = this_count >> 2; 617 } 618 } 619 if (sdp->sector_size == 4096) { 620 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 621 scmd_printk(KERN_ERR, SCpnt, 622 "Bad block number requested\n"); 623 goto out; 624 } else { 625 block = block >> 3; 626 this_count = this_count >> 3; 627 } 628 } 629 if (rq_data_dir(rq) == WRITE) { 630 if (!sdp->writeable) { 631 goto out; 632 } 633 SCpnt->cmnd[0] = WRITE_6; 634 SCpnt->sc_data_direction = DMA_TO_DEVICE; 635 636 if (blk_integrity_rq(rq) && 637 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) 638 goto out; 639 640 } else if (rq_data_dir(rq) == READ) { 641 SCpnt->cmnd[0] = READ_6; 642 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 643 } else { 644 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 645 goto out; 646 } 647 648 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 649 "%s %d/%u 512 byte blocks.\n", 650 (rq_data_dir(rq) == WRITE) ? 651 "writing" : "reading", this_count, 652 blk_rq_sectors(rq))); 653 654 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ 655 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 656 if (host_dif) 657 protect = 1 << 5; 658 else 659 protect = 0; 660 661 if (host_dif == SD_DIF_TYPE2_PROTECTION) { 662 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 663 664 if (unlikely(SCpnt->cmnd == NULL)) { 665 ret = BLKPREP_DEFER; 666 goto out; 667 } 668 669 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 670 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 671 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 672 SCpnt->cmnd[7] = 0x18; 673 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 674 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 675 676 /* LBA */ 677 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 678 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 679 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 680 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 681 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 682 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 683 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 684 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 685 686 /* Expected Indirect LBA */ 687 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 688 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 689 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 690 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 691 692 /* Transfer length */ 693 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 694 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 695 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 696 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 697 } else if (block > 0xffffffff) { 698 SCpnt->cmnd[0] += READ_16 - READ_6; 699 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 700 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 701 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 702 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 703 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 704 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 705 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 706 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 707 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 708 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 709 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 710 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 711 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 712 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 713 } else if ((this_count > 0xff) || (block > 0x1fffff) || 714 scsi_device_protection(SCpnt->device) || 715 SCpnt->device->use_10_for_rw) { 716 if (this_count > 0xffff) 717 this_count = 0xffff; 718 719 SCpnt->cmnd[0] += READ_10 - READ_6; 720 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); 721 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 722 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 723 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 724 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 725 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 726 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 727 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 728 } else { 729 if (unlikely(rq->cmd_flags & REQ_FUA)) { 730 /* 731 * This happens only if this drive failed 732 * 10byte rw command with ILLEGAL_REQUEST 733 * during operation and thus turned off 734 * use_10_for_rw. 735 */ 736 scmd_printk(KERN_ERR, SCpnt, 737 "FUA write on READ/WRITE(6) drive\n"); 738 goto out; 739 } 740 741 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 742 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 743 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 744 SCpnt->cmnd[4] = (unsigned char) this_count; 745 SCpnt->cmnd[5] = 0; 746 } 747 SCpnt->sdb.length = this_count * sdp->sector_size; 748 749 /* If DIF or DIX is enabled, tell HBA how to handle request */ 750 if (host_dif || scsi_prot_sg_count(SCpnt)) 751 sd_prot_op(SCpnt, host_dif); 752 753 /* 754 * We shouldn't disconnect in the middle of a sector, so with a dumb 755 * host adapter, it's safe to assume that we can at least transfer 756 * this many bytes between each connect / disconnect. 757 */ 758 SCpnt->transfersize = sdp->sector_size; 759 SCpnt->underflow = this_count << 9; 760 SCpnt->allowed = SD_MAX_RETRIES; 761 762 /* 763 * This indicates that the command is ready from our end to be 764 * queued. 765 */ 766 ret = BLKPREP_OK; 767 out: 768 return scsi_prep_return(q, rq, ret); 769 } 770 771 /** 772 * sd_open - open a scsi disk device 773 * @inode: only i_rdev member may be used 774 * @filp: only f_mode and f_flags may be used 775 * 776 * Returns 0 if successful. Returns a negated errno value in case 777 * of error. 778 * 779 * Note: This can be called from a user context (e.g. fsck(1) ) 780 * or from within the kernel (e.g. as a result of a mount(1) ). 781 * In the latter case @inode and @filp carry an abridged amount 782 * of information as noted above. 783 * 784 * Locking: called with bdev->bd_mutex held. 785 **/ 786 static int sd_open(struct block_device *bdev, fmode_t mode) 787 { 788 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 789 struct scsi_device *sdev; 790 int retval; 791 792 if (!sdkp) 793 return -ENXIO; 794 795 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 796 797 sdev = sdkp->device; 798 799 retval = scsi_autopm_get_device(sdev); 800 if (retval) 801 goto error_autopm; 802 803 /* 804 * If the device is in error recovery, wait until it is done. 805 * If the device is offline, then disallow any access to it. 806 */ 807 retval = -ENXIO; 808 if (!scsi_block_when_processing_errors(sdev)) 809 goto error_out; 810 811 if (sdev->removable || sdkp->write_prot) 812 check_disk_change(bdev); 813 814 /* 815 * If the drive is empty, just let the open fail. 816 */ 817 retval = -ENOMEDIUM; 818 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 819 goto error_out; 820 821 /* 822 * If the device has the write protect tab set, have the open fail 823 * if the user expects to be able to write to the thing. 824 */ 825 retval = -EROFS; 826 if (sdkp->write_prot && (mode & FMODE_WRITE)) 827 goto error_out; 828 829 /* 830 * It is possible that the disk changing stuff resulted in 831 * the device being taken offline. If this is the case, 832 * report this to the user, and don't pretend that the 833 * open actually succeeded. 834 */ 835 retval = -ENXIO; 836 if (!scsi_device_online(sdev)) 837 goto error_out; 838 839 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { 840 if (scsi_block_when_processing_errors(sdev)) 841 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 842 } 843 844 return 0; 845 846 error_out: 847 scsi_autopm_put_device(sdev); 848 error_autopm: 849 scsi_disk_put(sdkp); 850 return retval; 851 } 852 853 /** 854 * sd_release - invoked when the (last) close(2) is called on this 855 * scsi disk. 856 * @inode: only i_rdev member may be used 857 * @filp: only f_mode and f_flags may be used 858 * 859 * Returns 0. 860 * 861 * Note: may block (uninterruptible) if error recovery is underway 862 * on this disk. 863 * 864 * Locking: called with bdev->bd_mutex held. 865 **/ 866 static int sd_release(struct gendisk *disk, fmode_t mode) 867 { 868 struct scsi_disk *sdkp = scsi_disk(disk); 869 struct scsi_device *sdev = sdkp->device; 870 871 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 872 873 if (atomic_dec_return(&sdkp->openers) && sdev->removable) { 874 if (scsi_block_when_processing_errors(sdev)) 875 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 876 } 877 878 /* 879 * XXX and what if there are packets in flight and this close() 880 * XXX is followed by a "rmmod sd_mod"? 881 */ 882 883 scsi_autopm_put_device(sdev); 884 scsi_disk_put(sdkp); 885 return 0; 886 } 887 888 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 889 { 890 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 891 struct scsi_device *sdp = sdkp->device; 892 struct Scsi_Host *host = sdp->host; 893 int diskinfo[4]; 894 895 /* default to most commonly used values */ 896 diskinfo[0] = 0x40; /* 1 << 6 */ 897 diskinfo[1] = 0x20; /* 1 << 5 */ 898 diskinfo[2] = sdkp->capacity >> 11; 899 900 /* override with calculated, extended default, or driver values */ 901 if (host->hostt->bios_param) 902 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 903 else 904 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 905 906 geo->heads = diskinfo[0]; 907 geo->sectors = diskinfo[1]; 908 geo->cylinders = diskinfo[2]; 909 return 0; 910 } 911 912 /** 913 * sd_ioctl - process an ioctl 914 * @inode: only i_rdev/i_bdev members may be used 915 * @filp: only f_mode and f_flags may be used 916 * @cmd: ioctl command number 917 * @arg: this is third argument given to ioctl(2) system call. 918 * Often contains a pointer. 919 * 920 * Returns 0 if successful (some ioctls return postive numbers on 921 * success as well). Returns a negated errno value in case of error. 922 * 923 * Note: most ioctls are forward onto the block subsystem or further 924 * down in the scsi subsystem. 925 **/ 926 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 927 unsigned int cmd, unsigned long arg) 928 { 929 struct gendisk *disk = bdev->bd_disk; 930 struct scsi_device *sdp = scsi_disk(disk)->device; 931 void __user *p = (void __user *)arg; 932 int error; 933 934 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 935 disk->disk_name, cmd)); 936 937 /* 938 * If we are in the middle of error recovery, don't let anyone 939 * else try and use this device. Also, if error recovery fails, it 940 * may try and take the device offline, in which case all further 941 * access to the device is prohibited. 942 */ 943 error = scsi_nonblockable_ioctl(sdp, cmd, p, 944 (mode & FMODE_NDELAY) != 0); 945 if (!scsi_block_when_processing_errors(sdp) || !error) 946 goto out; 947 948 /* 949 * Send SCSI addressing ioctls directly to mid level, send other 950 * ioctls to block level and then onto mid level if they can't be 951 * resolved. 952 */ 953 switch (cmd) { 954 case SCSI_IOCTL_GET_IDLUN: 955 case SCSI_IOCTL_GET_BUS_NUMBER: 956 error = scsi_ioctl(sdp, cmd, p); 957 break; 958 default: 959 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); 960 if (error != -ENOTTY) 961 break; 962 error = scsi_ioctl(sdp, cmd, p); 963 break; 964 } 965 out: 966 return error; 967 } 968 969 static void set_media_not_present(struct scsi_disk *sdkp) 970 { 971 sdkp->media_present = 0; 972 sdkp->capacity = 0; 973 sdkp->device->changed = 1; 974 } 975 976 /** 977 * sd_media_changed - check if our medium changed 978 * @disk: kernel device descriptor 979 * 980 * Returns 0 if not applicable or no change; 1 if change 981 * 982 * Note: this function is invoked from the block subsystem. 983 **/ 984 static int sd_media_changed(struct gendisk *disk) 985 { 986 struct scsi_disk *sdkp = scsi_disk(disk); 987 struct scsi_device *sdp = sdkp->device; 988 struct scsi_sense_hdr *sshdr = NULL; 989 int retval; 990 991 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); 992 993 if (!sdp->removable) 994 return 0; 995 996 /* 997 * If the device is offline, don't send any commands - just pretend as 998 * if the command failed. If the device ever comes back online, we 999 * can deal with it then. It is only because of unrecoverable errors 1000 * that we would ever take a device offline in the first place. 1001 */ 1002 if (!scsi_device_online(sdp)) { 1003 set_media_not_present(sdkp); 1004 retval = 1; 1005 goto out; 1006 } 1007 1008 /* 1009 * Using TEST_UNIT_READY enables differentiation between drive with 1010 * no cartridge loaded - NOT READY, drive with changed cartridge - 1011 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 1012 * 1013 * Drives that auto spin down. eg iomega jaz 1G, will be started 1014 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 1015 * sd_revalidate() is called. 1016 */ 1017 retval = -ENODEV; 1018 1019 if (scsi_block_when_processing_errors(sdp)) { 1020 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 1021 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 1022 sshdr); 1023 } 1024 1025 /* 1026 * Unable to test, unit probably not ready. This usually 1027 * means there is no disc in the drive. Mark as changed, 1028 * and we will figure it out later once the drive is 1029 * available again. 1030 */ 1031 if (retval || (scsi_sense_valid(sshdr) && 1032 /* 0x3a is medium not present */ 1033 sshdr->asc == 0x3a)) { 1034 set_media_not_present(sdkp); 1035 retval = 1; 1036 goto out; 1037 } 1038 1039 /* 1040 * For removable scsi disk we have to recognise the presence 1041 * of a disk in the drive. This is kept in the struct scsi_disk 1042 * struct and tested at open ! Daniel Roche (dan@lectra.fr) 1043 */ 1044 sdkp->media_present = 1; 1045 1046 retval = sdp->changed; 1047 sdp->changed = 0; 1048 out: 1049 if (retval != sdkp->previous_state) 1050 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); 1051 sdkp->previous_state = retval; 1052 kfree(sshdr); 1053 return retval; 1054 } 1055 1056 static int sd_sync_cache(struct scsi_disk *sdkp) 1057 { 1058 int retries, res; 1059 struct scsi_device *sdp = sdkp->device; 1060 struct scsi_sense_hdr sshdr; 1061 1062 if (!scsi_device_online(sdp)) 1063 return -ENODEV; 1064 1065 1066 for (retries = 3; retries > 0; --retries) { 1067 unsigned char cmd[10] = { 0 }; 1068 1069 cmd[0] = SYNCHRONIZE_CACHE; 1070 /* 1071 * Leave the rest of the command zero to indicate 1072 * flush everything. 1073 */ 1074 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 1075 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1076 if (res == 0) 1077 break; 1078 } 1079 1080 if (res) { 1081 sd_print_result(sdkp, res); 1082 if (driver_byte(res) & DRIVER_SENSE) 1083 sd_print_sense_hdr(sdkp, &sshdr); 1084 } 1085 1086 if (res) 1087 return -EIO; 1088 return 0; 1089 } 1090 1091 static void sd_rescan(struct device *dev) 1092 { 1093 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1094 1095 if (sdkp) { 1096 revalidate_disk(sdkp->disk); 1097 scsi_disk_put(sdkp); 1098 } 1099 } 1100 1101 1102 #ifdef CONFIG_COMPAT 1103 /* 1104 * This gets directly called from VFS. When the ioctl 1105 * is not recognized we go back to the other translation paths. 1106 */ 1107 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1108 unsigned int cmd, unsigned long arg) 1109 { 1110 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1111 1112 /* 1113 * If we are in the middle of error recovery, don't let anyone 1114 * else try and use this device. Also, if error recovery fails, it 1115 * may try and take the device offline, in which case all further 1116 * access to the device is prohibited. 1117 */ 1118 if (!scsi_block_when_processing_errors(sdev)) 1119 return -ENODEV; 1120 1121 if (sdev->host->hostt->compat_ioctl) { 1122 int ret; 1123 1124 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1125 1126 return ret; 1127 } 1128 1129 /* 1130 * Let the static ioctl translation table take care of it. 1131 */ 1132 return -ENOIOCTLCMD; 1133 } 1134 #endif 1135 1136 static const struct block_device_operations sd_fops = { 1137 .owner = THIS_MODULE, 1138 .open = sd_open, 1139 .release = sd_release, 1140 .ioctl = sd_ioctl, 1141 .getgeo = sd_getgeo, 1142 #ifdef CONFIG_COMPAT 1143 .compat_ioctl = sd_compat_ioctl, 1144 #endif 1145 .media_changed = sd_media_changed, 1146 .revalidate_disk = sd_revalidate_disk, 1147 .unlock_native_capacity = sd_unlock_native_capacity, 1148 }; 1149 1150 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1151 { 1152 u64 start_lba = blk_rq_pos(scmd->request); 1153 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1154 u64 bad_lba; 1155 int info_valid; 1156 1157 if (scmd->request->cmd_type != REQ_TYPE_FS) 1158 return 0; 1159 1160 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1161 SCSI_SENSE_BUFFERSIZE, 1162 &bad_lba); 1163 if (!info_valid) 1164 return 0; 1165 1166 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1167 return 0; 1168 1169 if (scmd->device->sector_size < 512) { 1170 /* only legitimate sector_size here is 256 */ 1171 start_lba <<= 1; 1172 end_lba <<= 1; 1173 } else { 1174 /* be careful ... don't want any overflows */ 1175 u64 factor = scmd->device->sector_size / 512; 1176 do_div(start_lba, factor); 1177 do_div(end_lba, factor); 1178 } 1179 1180 /* The bad lba was reported incorrectly, we have no idea where 1181 * the error is. 1182 */ 1183 if (bad_lba < start_lba || bad_lba >= end_lba) 1184 return 0; 1185 1186 /* This computation should always be done in terms of 1187 * the resolution of the device's medium. 1188 */ 1189 return (bad_lba - start_lba) * scmd->device->sector_size; 1190 } 1191 1192 /** 1193 * sd_done - bottom half handler: called when the lower level 1194 * driver has completed (successfully or otherwise) a scsi command. 1195 * @SCpnt: mid-level's per command structure. 1196 * 1197 * Note: potentially run from within an ISR. Must not block. 1198 **/ 1199 static int sd_done(struct scsi_cmnd *SCpnt) 1200 { 1201 int result = SCpnt->result; 1202 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1203 struct scsi_sense_hdr sshdr; 1204 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1205 int sense_valid = 0; 1206 int sense_deferred = 0; 1207 1208 if (SCpnt->request->cmd_flags & REQ_DISCARD) { 1209 if (!result) 1210 scsi_set_resid(SCpnt, 0); 1211 return good_bytes; 1212 } 1213 1214 if (result) { 1215 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1216 if (sense_valid) 1217 sense_deferred = scsi_sense_is_deferred(&sshdr); 1218 } 1219 #ifdef CONFIG_SCSI_LOGGING 1220 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1221 if (sense_valid) { 1222 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1223 "sd_done: sb[respc,sk,asc," 1224 "ascq]=%x,%x,%x,%x\n", 1225 sshdr.response_code, 1226 sshdr.sense_key, sshdr.asc, 1227 sshdr.ascq)); 1228 } 1229 #endif 1230 if (driver_byte(result) != DRIVER_SENSE && 1231 (!sense_valid || sense_deferred)) 1232 goto out; 1233 1234 switch (sshdr.sense_key) { 1235 case HARDWARE_ERROR: 1236 case MEDIUM_ERROR: 1237 good_bytes = sd_completed_bytes(SCpnt); 1238 break; 1239 case RECOVERED_ERROR: 1240 good_bytes = scsi_bufflen(SCpnt); 1241 break; 1242 case NO_SENSE: 1243 /* This indicates a false check condition, so ignore it. An 1244 * unknown amount of data was transferred so treat it as an 1245 * error. 1246 */ 1247 scsi_print_sense("sd", SCpnt); 1248 SCpnt->result = 0; 1249 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1250 break; 1251 case ABORTED_COMMAND: /* DIF: Target detected corruption */ 1252 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */ 1253 if (sshdr.asc == 0x10) 1254 good_bytes = sd_completed_bytes(SCpnt); 1255 break; 1256 default: 1257 break; 1258 } 1259 out: 1260 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1261 sd_dif_complete(SCpnt, good_bytes); 1262 1263 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) 1264 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { 1265 1266 /* We have to print a failed command here as the 1267 * extended CDB gets freed before scsi_io_completion() 1268 * is called. 1269 */ 1270 if (result) 1271 scsi_print_command(SCpnt); 1272 1273 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1274 SCpnt->cmnd = NULL; 1275 SCpnt->cmd_len = 0; 1276 } 1277 1278 return good_bytes; 1279 } 1280 1281 static int media_not_present(struct scsi_disk *sdkp, 1282 struct scsi_sense_hdr *sshdr) 1283 { 1284 1285 if (!scsi_sense_valid(sshdr)) 1286 return 0; 1287 /* not invoked for commands that could return deferred errors */ 1288 if (sshdr->sense_key != NOT_READY && 1289 sshdr->sense_key != UNIT_ATTENTION) 1290 return 0; 1291 if (sshdr->asc != 0x3A) /* medium not present */ 1292 return 0; 1293 1294 set_media_not_present(sdkp); 1295 return 1; 1296 } 1297 1298 /* 1299 * spinup disk - called only in sd_revalidate_disk() 1300 */ 1301 static void 1302 sd_spinup_disk(struct scsi_disk *sdkp) 1303 { 1304 unsigned char cmd[10]; 1305 unsigned long spintime_expire = 0; 1306 int retries, spintime; 1307 unsigned int the_result; 1308 struct scsi_sense_hdr sshdr; 1309 int sense_valid = 0; 1310 1311 spintime = 0; 1312 1313 /* Spin up drives, as required. Only do this at boot time */ 1314 /* Spinup needs to be done for module loads too. */ 1315 do { 1316 retries = 0; 1317 1318 do { 1319 cmd[0] = TEST_UNIT_READY; 1320 memset((void *) &cmd[1], 0, 9); 1321 1322 the_result = scsi_execute_req(sdkp->device, cmd, 1323 DMA_NONE, NULL, 0, 1324 &sshdr, SD_TIMEOUT, 1325 SD_MAX_RETRIES, NULL); 1326 1327 /* 1328 * If the drive has indicated to us that it 1329 * doesn't have any media in it, don't bother 1330 * with any more polling. 1331 */ 1332 if (media_not_present(sdkp, &sshdr)) 1333 return; 1334 1335 if (the_result) 1336 sense_valid = scsi_sense_valid(&sshdr); 1337 retries++; 1338 } while (retries < 3 && 1339 (!scsi_status_is_good(the_result) || 1340 ((driver_byte(the_result) & DRIVER_SENSE) && 1341 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1342 1343 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1344 /* no sense, TUR either succeeded or failed 1345 * with a status error */ 1346 if(!spintime && !scsi_status_is_good(the_result)) { 1347 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1348 sd_print_result(sdkp, the_result); 1349 } 1350 break; 1351 } 1352 1353 /* 1354 * The device does not want the automatic start to be issued. 1355 */ 1356 if (sdkp->device->no_start_on_add) 1357 break; 1358 1359 if (sense_valid && sshdr.sense_key == NOT_READY) { 1360 if (sshdr.asc == 4 && sshdr.ascq == 3) 1361 break; /* manual intervention required */ 1362 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1363 break; /* standby */ 1364 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1365 break; /* unavailable */ 1366 /* 1367 * Issue command to spin up drive when not ready 1368 */ 1369 if (!spintime) { 1370 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1371 cmd[0] = START_STOP; 1372 cmd[1] = 1; /* Return immediately */ 1373 memset((void *) &cmd[2], 0, 8); 1374 cmd[4] = 1; /* Start spin cycle */ 1375 if (sdkp->device->start_stop_pwr_cond) 1376 cmd[4] |= 1 << 4; 1377 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1378 NULL, 0, &sshdr, 1379 SD_TIMEOUT, SD_MAX_RETRIES, 1380 NULL); 1381 spintime_expire = jiffies + 100 * HZ; 1382 spintime = 1; 1383 } 1384 /* Wait 1 second for next try */ 1385 msleep(1000); 1386 printk("."); 1387 1388 /* 1389 * Wait for USB flash devices with slow firmware. 1390 * Yes, this sense key/ASC combination shouldn't 1391 * occur here. It's characteristic of these devices. 1392 */ 1393 } else if (sense_valid && 1394 sshdr.sense_key == UNIT_ATTENTION && 1395 sshdr.asc == 0x28) { 1396 if (!spintime) { 1397 spintime_expire = jiffies + 5 * HZ; 1398 spintime = 1; 1399 } 1400 /* Wait 1 second for next try */ 1401 msleep(1000); 1402 } else { 1403 /* we don't understand the sense code, so it's 1404 * probably pointless to loop */ 1405 if(!spintime) { 1406 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1407 sd_print_sense_hdr(sdkp, &sshdr); 1408 } 1409 break; 1410 } 1411 1412 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1413 1414 if (spintime) { 1415 if (scsi_status_is_good(the_result)) 1416 printk("ready\n"); 1417 else 1418 printk("not responding...\n"); 1419 } 1420 } 1421 1422 1423 /* 1424 * Determine whether disk supports Data Integrity Field. 1425 */ 1426 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1427 { 1428 struct scsi_device *sdp = sdkp->device; 1429 u8 type; 1430 1431 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1432 return; 1433 1434 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1435 1436 if (type == sdkp->protection_type || !sdkp->first_scan) 1437 return; 1438 1439 sdkp->protection_type = type; 1440 1441 if (type > SD_DIF_TYPE3_PROTECTION) { 1442 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \ 1443 "protection type %u. Disabling disk!\n", type); 1444 sdkp->capacity = 0; 1445 return; 1446 } 1447 1448 if (scsi_host_dif_capable(sdp->host, type)) 1449 sd_printk(KERN_NOTICE, sdkp, 1450 "Enabling DIF Type %u protection\n", type); 1451 else 1452 sd_printk(KERN_NOTICE, sdkp, 1453 "Disabling DIF Type %u protection\n", type); 1454 } 1455 1456 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1457 struct scsi_sense_hdr *sshdr, int sense_valid, 1458 int the_result) 1459 { 1460 sd_print_result(sdkp, the_result); 1461 if (driver_byte(the_result) & DRIVER_SENSE) 1462 sd_print_sense_hdr(sdkp, sshdr); 1463 else 1464 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1465 1466 /* 1467 * Set dirty bit for removable devices if not ready - 1468 * sometimes drives will not report this properly. 1469 */ 1470 if (sdp->removable && 1471 sense_valid && sshdr->sense_key == NOT_READY) 1472 sdp->changed = 1; 1473 1474 /* 1475 * We used to set media_present to 0 here to indicate no media 1476 * in the drive, but some drives fail read capacity even with 1477 * media present, so we can't do that. 1478 */ 1479 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1480 } 1481 1482 #define RC16_LEN 32 1483 #if RC16_LEN > SD_BUF_SIZE 1484 #error RC16_LEN must not be more than SD_BUF_SIZE 1485 #endif 1486 1487 #define READ_CAPACITY_RETRIES_ON_RESET 10 1488 1489 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1490 unsigned char *buffer) 1491 { 1492 unsigned char cmd[16]; 1493 struct scsi_sense_hdr sshdr; 1494 int sense_valid = 0; 1495 int the_result; 1496 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1497 unsigned int alignment; 1498 unsigned long long lba; 1499 unsigned sector_size; 1500 1501 do { 1502 memset(cmd, 0, 16); 1503 cmd[0] = SERVICE_ACTION_IN; 1504 cmd[1] = SAI_READ_CAPACITY_16; 1505 cmd[13] = RC16_LEN; 1506 memset(buffer, 0, RC16_LEN); 1507 1508 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1509 buffer, RC16_LEN, &sshdr, 1510 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1511 1512 if (media_not_present(sdkp, &sshdr)) 1513 return -ENODEV; 1514 1515 if (the_result) { 1516 sense_valid = scsi_sense_valid(&sshdr); 1517 if (sense_valid && 1518 sshdr.sense_key == ILLEGAL_REQUEST && 1519 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1520 sshdr.ascq == 0x00) 1521 /* Invalid Command Operation Code or 1522 * Invalid Field in CDB, just retry 1523 * silently with RC10 */ 1524 return -EINVAL; 1525 if (sense_valid && 1526 sshdr.sense_key == UNIT_ATTENTION && 1527 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1528 /* Device reset might occur several times, 1529 * give it one more chance */ 1530 if (--reset_retries > 0) 1531 continue; 1532 } 1533 retries--; 1534 1535 } while (the_result && retries); 1536 1537 if (the_result) { 1538 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1539 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1540 return -EINVAL; 1541 } 1542 1543 sector_size = get_unaligned_be32(&buffer[8]); 1544 lba = get_unaligned_be64(&buffer[0]); 1545 1546 sd_read_protection_type(sdkp, buffer); 1547 1548 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1549 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1550 "kernel compiled with support for large block " 1551 "devices.\n"); 1552 sdkp->capacity = 0; 1553 return -EOVERFLOW; 1554 } 1555 1556 /* Logical blocks per physical block exponent */ 1557 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size; 1558 1559 /* Lowest aligned logical block */ 1560 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 1561 blk_queue_alignment_offset(sdp->request_queue, alignment); 1562 if (alignment && sdkp->first_scan) 1563 sd_printk(KERN_NOTICE, sdkp, 1564 "physical block alignment offset: %u\n", alignment); 1565 1566 if (buffer[14] & 0x80) { /* TPE */ 1567 struct request_queue *q = sdp->request_queue; 1568 1569 sdkp->thin_provisioning = 1; 1570 q->limits.discard_granularity = sdkp->hw_sector_size; 1571 q->limits.max_discard_sectors = 0xffffffff; 1572 1573 if (buffer[14] & 0x40) /* TPRZ */ 1574 q->limits.discard_zeroes_data = 1; 1575 1576 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 1577 } 1578 1579 sdkp->capacity = lba + 1; 1580 return sector_size; 1581 } 1582 1583 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 1584 unsigned char *buffer) 1585 { 1586 unsigned char cmd[16]; 1587 struct scsi_sense_hdr sshdr; 1588 int sense_valid = 0; 1589 int the_result; 1590 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; 1591 sector_t lba; 1592 unsigned sector_size; 1593 1594 do { 1595 cmd[0] = READ_CAPACITY; 1596 memset(&cmd[1], 0, 9); 1597 memset(buffer, 0, 8); 1598 1599 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1600 buffer, 8, &sshdr, 1601 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1602 1603 if (media_not_present(sdkp, &sshdr)) 1604 return -ENODEV; 1605 1606 if (the_result) { 1607 sense_valid = scsi_sense_valid(&sshdr); 1608 if (sense_valid && 1609 sshdr.sense_key == UNIT_ATTENTION && 1610 sshdr.asc == 0x29 && sshdr.ascq == 0x00) 1611 /* Device reset might occur several times, 1612 * give it one more chance */ 1613 if (--reset_retries > 0) 1614 continue; 1615 } 1616 retries--; 1617 1618 } while (the_result && retries); 1619 1620 if (the_result) { 1621 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1622 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1623 return -EINVAL; 1624 } 1625 1626 sector_size = get_unaligned_be32(&buffer[4]); 1627 lba = get_unaligned_be32(&buffer[0]); 1628 1629 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 1630 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1631 "kernel compiled with support for large block " 1632 "devices.\n"); 1633 sdkp->capacity = 0; 1634 return -EOVERFLOW; 1635 } 1636 1637 sdkp->capacity = lba + 1; 1638 sdkp->hw_sector_size = sector_size; 1639 return sector_size; 1640 } 1641 1642 static int sd_try_rc16_first(struct scsi_device *sdp) 1643 { 1644 if (sdp->host->max_cmd_len < 16) 1645 return 0; 1646 if (sdp->scsi_level > SCSI_SPC_2) 1647 return 1; 1648 if (scsi_device_protection(sdp)) 1649 return 1; 1650 return 0; 1651 } 1652 1653 /* 1654 * read disk capacity 1655 */ 1656 static void 1657 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1658 { 1659 int sector_size; 1660 struct scsi_device *sdp = sdkp->device; 1661 sector_t old_capacity = sdkp->capacity; 1662 1663 if (sd_try_rc16_first(sdp)) { 1664 sector_size = read_capacity_16(sdkp, sdp, buffer); 1665 if (sector_size == -EOVERFLOW) 1666 goto got_data; 1667 if (sector_size == -ENODEV) 1668 return; 1669 if (sector_size < 0) 1670 sector_size = read_capacity_10(sdkp, sdp, buffer); 1671 if (sector_size < 0) 1672 return; 1673 } else { 1674 sector_size = read_capacity_10(sdkp, sdp, buffer); 1675 if (sector_size == -EOVERFLOW) 1676 goto got_data; 1677 if (sector_size < 0) 1678 return; 1679 if ((sizeof(sdkp->capacity) > 4) && 1680 (sdkp->capacity > 0xffffffffULL)) { 1681 int old_sector_size = sector_size; 1682 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1683 "Trying to use READ CAPACITY(16).\n"); 1684 sector_size = read_capacity_16(sdkp, sdp, buffer); 1685 if (sector_size < 0) { 1686 sd_printk(KERN_NOTICE, sdkp, 1687 "Using 0xffffffff as device size\n"); 1688 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1689 sector_size = old_sector_size; 1690 goto got_data; 1691 } 1692 } 1693 } 1694 1695 /* Some devices are known to return the total number of blocks, 1696 * not the highest block number. Some devices have versions 1697 * which do this and others which do not. Some devices we might 1698 * suspect of doing this but we don't know for certain. 1699 * 1700 * If we know the reported capacity is wrong, decrement it. If 1701 * we can only guess, then assume the number of blocks is even 1702 * (usually true but not always) and err on the side of lowering 1703 * the capacity. 1704 */ 1705 if (sdp->fix_capacity || 1706 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 1707 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 1708 "from its reported value: %llu\n", 1709 (unsigned long long) sdkp->capacity); 1710 --sdkp->capacity; 1711 } 1712 1713 got_data: 1714 if (sector_size == 0) { 1715 sector_size = 512; 1716 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1717 "assuming 512.\n"); 1718 } 1719 1720 if (sector_size != 512 && 1721 sector_size != 1024 && 1722 sector_size != 2048 && 1723 sector_size != 4096 && 1724 sector_size != 256) { 1725 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1726 sector_size); 1727 /* 1728 * The user might want to re-format the drive with 1729 * a supported sectorsize. Once this happens, it 1730 * would be relatively trivial to set the thing up. 1731 * For this reason, we leave the thing in the table. 1732 */ 1733 sdkp->capacity = 0; 1734 /* 1735 * set a bogus sector size so the normal read/write 1736 * logic in the block layer will eventually refuse any 1737 * request on this device without tripping over power 1738 * of two sector size assumptions 1739 */ 1740 sector_size = 512; 1741 } 1742 blk_queue_logical_block_size(sdp->request_queue, sector_size); 1743 1744 { 1745 char cap_str_2[10], cap_str_10[10]; 1746 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 1747 1748 string_get_size(sz, STRING_UNITS_2, cap_str_2, 1749 sizeof(cap_str_2)); 1750 string_get_size(sz, STRING_UNITS_10, cap_str_10, 1751 sizeof(cap_str_10)); 1752 1753 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 1754 sd_printk(KERN_NOTICE, sdkp, 1755 "%llu %d-byte logical blocks: (%s/%s)\n", 1756 (unsigned long long)sdkp->capacity, 1757 sector_size, cap_str_10, cap_str_2); 1758 1759 if (sdkp->hw_sector_size != sector_size) 1760 sd_printk(KERN_NOTICE, sdkp, 1761 "%u-byte physical blocks\n", 1762 sdkp->hw_sector_size); 1763 } 1764 } 1765 1766 /* Rescale capacity to 512-byte units */ 1767 if (sector_size == 4096) 1768 sdkp->capacity <<= 3; 1769 else if (sector_size == 2048) 1770 sdkp->capacity <<= 2; 1771 else if (sector_size == 1024) 1772 sdkp->capacity <<= 1; 1773 else if (sector_size == 256) 1774 sdkp->capacity >>= 1; 1775 1776 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size); 1777 sdkp->device->sector_size = sector_size; 1778 } 1779 1780 /* called with buffer of length 512 */ 1781 static inline int 1782 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1783 unsigned char *buffer, int len, struct scsi_mode_data *data, 1784 struct scsi_sense_hdr *sshdr) 1785 { 1786 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1787 SD_TIMEOUT, SD_MAX_RETRIES, data, 1788 sshdr); 1789 } 1790 1791 /* 1792 * read write protect setting, if possible - called only in sd_revalidate_disk() 1793 * called with buffer of length SD_BUF_SIZE 1794 */ 1795 static void 1796 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1797 { 1798 int res; 1799 struct scsi_device *sdp = sdkp->device; 1800 struct scsi_mode_data data; 1801 int old_wp = sdkp->write_prot; 1802 1803 set_disk_ro(sdkp->disk, 0); 1804 if (sdp->skip_ms_page_3f) { 1805 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1806 return; 1807 } 1808 1809 if (sdp->use_192_bytes_for_3f) { 1810 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1811 } else { 1812 /* 1813 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1814 * We have to start carefully: some devices hang if we ask 1815 * for more than is available. 1816 */ 1817 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1818 1819 /* 1820 * Second attempt: ask for page 0 When only page 0 is 1821 * implemented, a request for page 3F may return Sense Key 1822 * 5: Illegal Request, Sense Code 24: Invalid field in 1823 * CDB. 1824 */ 1825 if (!scsi_status_is_good(res)) 1826 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1827 1828 /* 1829 * Third attempt: ask 255 bytes, as we did earlier. 1830 */ 1831 if (!scsi_status_is_good(res)) 1832 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1833 &data, NULL); 1834 } 1835 1836 if (!scsi_status_is_good(res)) { 1837 sd_printk(KERN_WARNING, sdkp, 1838 "Test WP failed, assume Write Enabled\n"); 1839 } else { 1840 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1841 set_disk_ro(sdkp->disk, sdkp->write_prot); 1842 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 1843 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1844 sdkp->write_prot ? "on" : "off"); 1845 sd_printk(KERN_DEBUG, sdkp, 1846 "Mode Sense: %02x %02x %02x %02x\n", 1847 buffer[0], buffer[1], buffer[2], buffer[3]); 1848 } 1849 } 1850 } 1851 1852 /* 1853 * sd_read_cache_type - called only from sd_revalidate_disk() 1854 * called with buffer of length SD_BUF_SIZE 1855 */ 1856 static void 1857 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1858 { 1859 int len = 0, res; 1860 struct scsi_device *sdp = sdkp->device; 1861 1862 int dbd; 1863 int modepage; 1864 struct scsi_mode_data data; 1865 struct scsi_sense_hdr sshdr; 1866 int old_wce = sdkp->WCE; 1867 int old_rcd = sdkp->RCD; 1868 int old_dpofua = sdkp->DPOFUA; 1869 1870 if (sdp->skip_ms_page_8) 1871 goto defaults; 1872 1873 if (sdp->type == TYPE_RBC) { 1874 modepage = 6; 1875 dbd = 8; 1876 } else { 1877 modepage = 8; 1878 dbd = 0; 1879 } 1880 1881 /* cautiously ask */ 1882 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1883 1884 if (!scsi_status_is_good(res)) 1885 goto bad_sense; 1886 1887 if (!data.header_length) { 1888 modepage = 6; 1889 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1890 } 1891 1892 /* that went OK, now ask for the proper length */ 1893 len = data.length; 1894 1895 /* 1896 * We're only interested in the first three bytes, actually. 1897 * But the data cache page is defined for the first 20. 1898 */ 1899 if (len < 3) 1900 goto bad_sense; 1901 if (len > 20) 1902 len = 20; 1903 1904 /* Take headers and block descriptors into account */ 1905 len += data.header_length + data.block_descriptor_length; 1906 if (len > SD_BUF_SIZE) 1907 goto bad_sense; 1908 1909 /* Get the data */ 1910 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1911 1912 if (scsi_status_is_good(res)) { 1913 int offset = data.header_length + data.block_descriptor_length; 1914 1915 if (offset >= SD_BUF_SIZE - 2) { 1916 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1917 goto defaults; 1918 } 1919 1920 if ((buffer[offset] & 0x3f) != modepage) { 1921 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1922 goto defaults; 1923 } 1924 1925 if (modepage == 8) { 1926 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1927 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1928 } else { 1929 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1930 sdkp->RCD = 0; 1931 } 1932 1933 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1934 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1935 sd_printk(KERN_NOTICE, sdkp, 1936 "Uses READ/WRITE(6), disabling FUA\n"); 1937 sdkp->DPOFUA = 0; 1938 } 1939 1940 if (sdkp->first_scan || old_wce != sdkp->WCE || 1941 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 1942 sd_printk(KERN_NOTICE, sdkp, 1943 "Write cache: %s, read cache: %s, %s\n", 1944 sdkp->WCE ? "enabled" : "disabled", 1945 sdkp->RCD ? "disabled" : "enabled", 1946 sdkp->DPOFUA ? "supports DPO and FUA" 1947 : "doesn't support DPO or FUA"); 1948 1949 return; 1950 } 1951 1952 bad_sense: 1953 if (scsi_sense_valid(&sshdr) && 1954 sshdr.sense_key == ILLEGAL_REQUEST && 1955 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1956 /* Invalid field in CDB */ 1957 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1958 else 1959 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1960 1961 defaults: 1962 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1963 sdkp->WCE = 0; 1964 sdkp->RCD = 0; 1965 sdkp->DPOFUA = 0; 1966 } 1967 1968 /* 1969 * The ATO bit indicates whether the DIF application tag is available 1970 * for use by the operating system. 1971 */ 1972 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 1973 { 1974 int res, offset; 1975 struct scsi_device *sdp = sdkp->device; 1976 struct scsi_mode_data data; 1977 struct scsi_sense_hdr sshdr; 1978 1979 if (sdp->type != TYPE_DISK) 1980 return; 1981 1982 if (sdkp->protection_type == 0) 1983 return; 1984 1985 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 1986 SD_MAX_RETRIES, &data, &sshdr); 1987 1988 if (!scsi_status_is_good(res) || !data.header_length || 1989 data.length < 6) { 1990 sd_printk(KERN_WARNING, sdkp, 1991 "getting Control mode page failed, assume no ATO\n"); 1992 1993 if (scsi_sense_valid(&sshdr)) 1994 sd_print_sense_hdr(sdkp, &sshdr); 1995 1996 return; 1997 } 1998 1999 offset = data.header_length + data.block_descriptor_length; 2000 2001 if ((buffer[offset] & 0x3f) != 0x0a) { 2002 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 2003 return; 2004 } 2005 2006 if ((buffer[offset + 5] & 0x80) == 0) 2007 return; 2008 2009 sdkp->ATO = 1; 2010 2011 return; 2012 } 2013 2014 /** 2015 * sd_read_block_limits - Query disk device for preferred I/O sizes. 2016 * @disk: disk to query 2017 */ 2018 static void sd_read_block_limits(struct scsi_disk *sdkp) 2019 { 2020 struct request_queue *q = sdkp->disk->queue; 2021 unsigned int sector_sz = sdkp->device->sector_size; 2022 const int vpd_len = 64; 2023 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 2024 2025 if (!buffer || 2026 /* Block Limits VPD */ 2027 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 2028 goto out; 2029 2030 blk_queue_io_min(sdkp->disk->queue, 2031 get_unaligned_be16(&buffer[6]) * sector_sz); 2032 blk_queue_io_opt(sdkp->disk->queue, 2033 get_unaligned_be32(&buffer[12]) * sector_sz); 2034 2035 /* Thin provisioning enabled and page length indicates TP support */ 2036 if (sdkp->thin_provisioning && buffer[3] == 0x3c) { 2037 unsigned int lba_count, desc_count, granularity; 2038 2039 lba_count = get_unaligned_be32(&buffer[20]); 2040 desc_count = get_unaligned_be32(&buffer[24]); 2041 2042 if (lba_count) { 2043 q->limits.max_discard_sectors = 2044 lba_count * sector_sz >> 9; 2045 2046 if (desc_count) 2047 sdkp->unmap = 1; 2048 } 2049 2050 granularity = get_unaligned_be32(&buffer[28]); 2051 2052 if (granularity) 2053 q->limits.discard_granularity = granularity * sector_sz; 2054 2055 if (buffer[32] & 0x80) 2056 q->limits.discard_alignment = 2057 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 2058 } 2059 2060 out: 2061 kfree(buffer); 2062 } 2063 2064 /** 2065 * sd_read_block_characteristics - Query block dev. characteristics 2066 * @disk: disk to query 2067 */ 2068 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2069 { 2070 unsigned char *buffer; 2071 u16 rot; 2072 const int vpd_len = 64; 2073 2074 buffer = kmalloc(vpd_len, GFP_KERNEL); 2075 2076 if (!buffer || 2077 /* Block Device Characteristics VPD */ 2078 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2079 goto out; 2080 2081 rot = get_unaligned_be16(&buffer[4]); 2082 2083 if (rot == 1) 2084 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2085 2086 out: 2087 kfree(buffer); 2088 } 2089 2090 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2091 { 2092 /* 2093 * Although VPD inquiries can go to SCSI-2 type devices, 2094 * some USB ones crash on receiving them, and the pages 2095 * we currently ask for are for SPC-3 and beyond 2096 */ 2097 if (sdp->scsi_level > SCSI_SPC_2) 2098 return 1; 2099 return 0; 2100 } 2101 2102 /** 2103 * sd_revalidate_disk - called the first time a new disk is seen, 2104 * performs disk spin up, read_capacity, etc. 2105 * @disk: struct gendisk we care about 2106 **/ 2107 static int sd_revalidate_disk(struct gendisk *disk) 2108 { 2109 struct scsi_disk *sdkp = scsi_disk(disk); 2110 struct scsi_device *sdp = sdkp->device; 2111 unsigned char *buffer; 2112 unsigned ordered; 2113 2114 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2115 "sd_revalidate_disk\n")); 2116 2117 /* 2118 * If the device is offline, don't try and read capacity or any 2119 * of the other niceties. 2120 */ 2121 if (!scsi_device_online(sdp)) 2122 goto out; 2123 2124 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2125 if (!buffer) { 2126 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2127 "allocation failure.\n"); 2128 goto out; 2129 } 2130 2131 sd_spinup_disk(sdkp); 2132 2133 /* 2134 * Without media there is no reason to ask; moreover, some devices 2135 * react badly if we do. 2136 */ 2137 if (sdkp->media_present) { 2138 sd_read_capacity(sdkp, buffer); 2139 2140 if (sd_try_extended_inquiry(sdp)) { 2141 sd_read_block_limits(sdkp); 2142 sd_read_block_characteristics(sdkp); 2143 } 2144 2145 sd_read_write_protect_flag(sdkp, buffer); 2146 sd_read_cache_type(sdkp, buffer); 2147 sd_read_app_tag_own(sdkp, buffer); 2148 } 2149 2150 sdkp->first_scan = 0; 2151 2152 /* 2153 * We now have all cache related info, determine how we deal 2154 * with ordered requests. Note that as the current SCSI 2155 * dispatch function can alter request order, we cannot use 2156 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 2157 */ 2158 if (sdkp->WCE) 2159 ordered = sdkp->DPOFUA 2160 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 2161 else 2162 ordered = QUEUE_ORDERED_DRAIN; 2163 2164 blk_queue_ordered(sdkp->disk->queue, ordered); 2165 2166 set_capacity(disk, sdkp->capacity); 2167 kfree(buffer); 2168 2169 out: 2170 return 0; 2171 } 2172 2173 /** 2174 * sd_unlock_native_capacity - unlock native capacity 2175 * @disk: struct gendisk to set capacity for 2176 * 2177 * Block layer calls this function if it detects that partitions 2178 * on @disk reach beyond the end of the device. If the SCSI host 2179 * implements ->unlock_native_capacity() method, it's invoked to 2180 * give it a chance to adjust the device capacity. 2181 * 2182 * CONTEXT: 2183 * Defined by block layer. Might sleep. 2184 */ 2185 static void sd_unlock_native_capacity(struct gendisk *disk) 2186 { 2187 struct scsi_device *sdev = scsi_disk(disk)->device; 2188 2189 if (sdev->host->hostt->unlock_native_capacity) 2190 sdev->host->hostt->unlock_native_capacity(sdev); 2191 } 2192 2193 /** 2194 * sd_format_disk_name - format disk name 2195 * @prefix: name prefix - ie. "sd" for SCSI disks 2196 * @index: index of the disk to format name for 2197 * @buf: output buffer 2198 * @buflen: length of the output buffer 2199 * 2200 * SCSI disk names starts at sda. The 26th device is sdz and the 2201 * 27th is sdaa. The last one for two lettered suffix is sdzz 2202 * which is followed by sdaaa. 2203 * 2204 * This is basically 26 base counting with one extra 'nil' entry 2205 * at the beginning from the second digit on and can be 2206 * determined using similar method as 26 base conversion with the 2207 * index shifted -1 after each digit is computed. 2208 * 2209 * CONTEXT: 2210 * Don't care. 2211 * 2212 * RETURNS: 2213 * 0 on success, -errno on failure. 2214 */ 2215 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2216 { 2217 const int base = 'z' - 'a' + 1; 2218 char *begin = buf + strlen(prefix); 2219 char *end = buf + buflen; 2220 char *p; 2221 int unit; 2222 2223 p = end - 1; 2224 *p = '\0'; 2225 unit = base; 2226 do { 2227 if (p == begin) 2228 return -EINVAL; 2229 *--p = 'a' + (index % unit); 2230 index = (index / unit) - 1; 2231 } while (index >= 0); 2232 2233 memmove(begin, p, end - p); 2234 memcpy(buf, prefix, strlen(prefix)); 2235 2236 return 0; 2237 } 2238 2239 /* 2240 * The asynchronous part of sd_probe 2241 */ 2242 static void sd_probe_async(void *data, async_cookie_t cookie) 2243 { 2244 struct scsi_disk *sdkp = data; 2245 struct scsi_device *sdp; 2246 struct gendisk *gd; 2247 u32 index; 2248 struct device *dev; 2249 2250 sdp = sdkp->device; 2251 gd = sdkp->disk; 2252 index = sdkp->index; 2253 dev = &sdp->sdev_gendev; 2254 2255 if (index < SD_MAX_DISKS) { 2256 gd->major = sd_major((index & 0xf0) >> 4); 2257 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2258 gd->minors = SD_MINORS; 2259 } 2260 gd->fops = &sd_fops; 2261 gd->private_data = &sdkp->driver; 2262 gd->queue = sdkp->device->request_queue; 2263 2264 /* defaults, until the device tells us otherwise */ 2265 sdp->sector_size = 512; 2266 sdkp->capacity = 0; 2267 sdkp->media_present = 1; 2268 sdkp->write_prot = 0; 2269 sdkp->WCE = 0; 2270 sdkp->RCD = 0; 2271 sdkp->ATO = 0; 2272 sdkp->first_scan = 1; 2273 2274 sd_revalidate_disk(gd); 2275 2276 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2277 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn); 2278 2279 gd->driverfs_dev = &sdp->sdev_gendev; 2280 gd->flags = GENHD_FL_EXT_DEVT; 2281 if (sdp->removable) 2282 gd->flags |= GENHD_FL_REMOVABLE; 2283 2284 add_disk(gd); 2285 sd_dif_config_host(sdkp); 2286 2287 sd_revalidate_disk(gd); 2288 2289 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2290 sdp->removable ? "removable " : ""); 2291 scsi_autopm_put_device(sdp); 2292 put_device(&sdkp->dev); 2293 } 2294 2295 /** 2296 * sd_probe - called during driver initialization and whenever a 2297 * new scsi device is attached to the system. It is called once 2298 * for each scsi device (not just disks) present. 2299 * @dev: pointer to device object 2300 * 2301 * Returns 0 if successful (or not interested in this scsi device 2302 * (e.g. scanner)); 1 when there is an error. 2303 * 2304 * Note: this function is invoked from the scsi mid-level. 2305 * This function sets up the mapping between a given 2306 * <host,channel,id,lun> (found in sdp) and new device name 2307 * (e.g. /dev/sda). More precisely it is the block device major 2308 * and minor number that is chosen here. 2309 * 2310 * Assume sd_attach is not re-entrant (for time being) 2311 * Also think about sd_attach() and sd_remove() running coincidentally. 2312 **/ 2313 static int sd_probe(struct device *dev) 2314 { 2315 struct scsi_device *sdp = to_scsi_device(dev); 2316 struct scsi_disk *sdkp; 2317 struct gendisk *gd; 2318 int index; 2319 int error; 2320 2321 error = -ENODEV; 2322 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2323 goto out; 2324 2325 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2326 "sd_attach\n")); 2327 2328 error = -ENOMEM; 2329 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2330 if (!sdkp) 2331 goto out; 2332 2333 gd = alloc_disk(SD_MINORS); 2334 if (!gd) 2335 goto out_free; 2336 2337 do { 2338 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2339 goto out_put; 2340 2341 spin_lock(&sd_index_lock); 2342 error = ida_get_new(&sd_index_ida, &index); 2343 spin_unlock(&sd_index_lock); 2344 } while (error == -EAGAIN); 2345 2346 if (error) 2347 goto out_put; 2348 2349 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2350 if (error) 2351 goto out_free_index; 2352 2353 sdkp->device = sdp; 2354 sdkp->driver = &sd_template; 2355 sdkp->disk = gd; 2356 sdkp->index = index; 2357 atomic_set(&sdkp->openers, 0); 2358 sdkp->previous_state = 1; 2359 2360 if (!sdp->request_queue->rq_timeout) { 2361 if (sdp->type != TYPE_MOD) 2362 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2363 else 2364 blk_queue_rq_timeout(sdp->request_queue, 2365 SD_MOD_TIMEOUT); 2366 } 2367 2368 device_initialize(&sdkp->dev); 2369 sdkp->dev.parent = dev; 2370 sdkp->dev.class = &sd_disk_class; 2371 dev_set_name(&sdkp->dev, dev_name(dev)); 2372 2373 if (device_add(&sdkp->dev)) 2374 goto out_free_index; 2375 2376 get_device(dev); 2377 dev_set_drvdata(dev, sdkp); 2378 2379 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2380 async_schedule(sd_probe_async, sdkp); 2381 2382 return 0; 2383 2384 out_free_index: 2385 spin_lock(&sd_index_lock); 2386 ida_remove(&sd_index_ida, index); 2387 spin_unlock(&sd_index_lock); 2388 out_put: 2389 put_disk(gd); 2390 out_free: 2391 kfree(sdkp); 2392 out: 2393 return error; 2394 } 2395 2396 /** 2397 * sd_remove - called whenever a scsi disk (previously recognized by 2398 * sd_probe) is detached from the system. It is called (potentially 2399 * multiple times) during sd module unload. 2400 * @sdp: pointer to mid level scsi device object 2401 * 2402 * Note: this function is invoked from the scsi mid-level. 2403 * This function potentially frees up a device name (e.g. /dev/sdc) 2404 * that could be re-used by a subsequent sd_probe(). 2405 * This function is not called when the built-in sd driver is "exit-ed". 2406 **/ 2407 static int sd_remove(struct device *dev) 2408 { 2409 struct scsi_disk *sdkp; 2410 2411 sdkp = dev_get_drvdata(dev); 2412 scsi_autopm_get_device(sdkp->device); 2413 2414 async_synchronize_full(); 2415 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 2416 blk_queue_unprep_rq(sdkp->device->request_queue, NULL); 2417 device_del(&sdkp->dev); 2418 del_gendisk(sdkp->disk); 2419 sd_shutdown(dev); 2420 2421 mutex_lock(&sd_ref_mutex); 2422 dev_set_drvdata(dev, NULL); 2423 put_device(&sdkp->dev); 2424 mutex_unlock(&sd_ref_mutex); 2425 2426 return 0; 2427 } 2428 2429 /** 2430 * scsi_disk_release - Called to free the scsi_disk structure 2431 * @dev: pointer to embedded class device 2432 * 2433 * sd_ref_mutex must be held entering this routine. Because it is 2434 * called on last put, you should always use the scsi_disk_get() 2435 * scsi_disk_put() helpers which manipulate the semaphore directly 2436 * and never do a direct put_device. 2437 **/ 2438 static void scsi_disk_release(struct device *dev) 2439 { 2440 struct scsi_disk *sdkp = to_scsi_disk(dev); 2441 struct gendisk *disk = sdkp->disk; 2442 2443 spin_lock(&sd_index_lock); 2444 ida_remove(&sd_index_ida, sdkp->index); 2445 spin_unlock(&sd_index_lock); 2446 2447 disk->private_data = NULL; 2448 put_disk(disk); 2449 put_device(&sdkp->device->sdev_gendev); 2450 2451 kfree(sdkp); 2452 } 2453 2454 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 2455 { 2456 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 2457 struct scsi_sense_hdr sshdr; 2458 struct scsi_device *sdp = sdkp->device; 2459 int res; 2460 2461 if (start) 2462 cmd[4] |= 1; /* START */ 2463 2464 if (sdp->start_stop_pwr_cond) 2465 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 2466 2467 if (!scsi_device_online(sdp)) 2468 return -ENODEV; 2469 2470 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 2471 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2472 if (res) { 2473 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 2474 sd_print_result(sdkp, res); 2475 if (driver_byte(res) & DRIVER_SENSE) 2476 sd_print_sense_hdr(sdkp, &sshdr); 2477 } 2478 2479 return res; 2480 } 2481 2482 /* 2483 * Send a SYNCHRONIZE CACHE instruction down to the device through 2484 * the normal SCSI command structure. Wait for the command to 2485 * complete. 2486 */ 2487 static void sd_shutdown(struct device *dev) 2488 { 2489 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2490 2491 if (!sdkp) 2492 return; /* this can happen */ 2493 2494 if (sdkp->WCE) { 2495 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2496 sd_sync_cache(sdkp); 2497 } 2498 2499 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 2500 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2501 sd_start_stop_device(sdkp, 0); 2502 } 2503 2504 scsi_disk_put(sdkp); 2505 } 2506 2507 static int sd_suspend(struct device *dev, pm_message_t mesg) 2508 { 2509 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2510 int ret = 0; 2511 2512 if (!sdkp) 2513 return 0; /* this can happen */ 2514 2515 if (sdkp->WCE) { 2516 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2517 ret = sd_sync_cache(sdkp); 2518 if (ret) 2519 goto done; 2520 } 2521 2522 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 2523 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2524 ret = sd_start_stop_device(sdkp, 0); 2525 } 2526 2527 done: 2528 scsi_disk_put(sdkp); 2529 return ret; 2530 } 2531 2532 static int sd_resume(struct device *dev) 2533 { 2534 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2535 int ret = 0; 2536 2537 if (!sdkp->device->manage_start_stop) 2538 goto done; 2539 2540 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 2541 ret = sd_start_stop_device(sdkp, 1); 2542 2543 done: 2544 scsi_disk_put(sdkp); 2545 return ret; 2546 } 2547 2548 /** 2549 * init_sd - entry point for this driver (both when built in or when 2550 * a module). 2551 * 2552 * Note: this function registers this driver with the scsi mid-level. 2553 **/ 2554 static int __init init_sd(void) 2555 { 2556 int majors = 0, i, err; 2557 2558 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 2559 2560 for (i = 0; i < SD_MAJORS; i++) 2561 if (register_blkdev(sd_major(i), "sd") == 0) 2562 majors++; 2563 2564 if (!majors) 2565 return -ENODEV; 2566 2567 err = class_register(&sd_disk_class); 2568 if (err) 2569 goto err_out; 2570 2571 err = scsi_register_driver(&sd_template.gendrv); 2572 if (err) 2573 goto err_out_class; 2574 2575 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 2576 0, 0, NULL); 2577 if (!sd_cdb_cache) { 2578 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 2579 goto err_out_class; 2580 } 2581 2582 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 2583 if (!sd_cdb_pool) { 2584 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 2585 goto err_out_cache; 2586 } 2587 2588 return 0; 2589 2590 err_out_cache: 2591 kmem_cache_destroy(sd_cdb_cache); 2592 2593 err_out_class: 2594 class_unregister(&sd_disk_class); 2595 err_out: 2596 for (i = 0; i < SD_MAJORS; i++) 2597 unregister_blkdev(sd_major(i), "sd"); 2598 return err; 2599 } 2600 2601 /** 2602 * exit_sd - exit point for this driver (when it is a module). 2603 * 2604 * Note: this function unregisters this driver from the scsi mid-level. 2605 **/ 2606 static void __exit exit_sd(void) 2607 { 2608 int i; 2609 2610 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 2611 2612 mempool_destroy(sd_cdb_pool); 2613 kmem_cache_destroy(sd_cdb_cache); 2614 2615 scsi_unregister_driver(&sd_template.gendrv); 2616 class_unregister(&sd_disk_class); 2617 2618 for (i = 0; i < SD_MAJORS; i++) 2619 unregister_blkdev(sd_major(i), "sd"); 2620 } 2621 2622 module_init(init_sd); 2623 module_exit(exit_sd); 2624 2625 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 2626 struct scsi_sense_hdr *sshdr) 2627 { 2628 sd_printk(KERN_INFO, sdkp, ""); 2629 scsi_show_sense_hdr(sshdr); 2630 sd_printk(KERN_INFO, sdkp, ""); 2631 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 2632 } 2633 2634 static void sd_print_result(struct scsi_disk *sdkp, int result) 2635 { 2636 sd_printk(KERN_INFO, sdkp, ""); 2637 scsi_show_result(result); 2638 } 2639 2640