1 /* 2 * sd.c Copyright (C) 1992 Drew Eckhardt 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * Linux scsi disk driver 6 * Initial versions: Drew Eckhardt 7 * Subsequent revisions: Eric Youngdale 8 * Modification history: 9 * - Drew Eckhardt <drew@colorado.edu> original 10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 11 * outstanding request, and other enhancements. 12 * Support loadable low-level scsi drivers. 13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 14 * eight major numbers. 15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. 16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 17 * sd_init and cleanups. 18 * - Alex Davis <letmein@erols.com> Fix problem where partition info 19 * not being read in sd_open. Fix problem where removable media 20 * could be ejected after sd_open. 21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x 22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 24 * Support 32k/1M disks. 25 * 26 * Logging policy (needs CONFIG_SCSI_LOGGING defined): 27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 30 * - entering other commands: SCSI_LOG_HLQUEUE level 3 31 * Note: when the logging level is set by the user, it must be greater 32 * than the level indicated above to trigger output. 33 */ 34 35 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/genhd.h> 41 #include <linux/hdreg.h> 42 #include <linux/errno.h> 43 #include <linux/idr.h> 44 #include <linux/interrupt.h> 45 #include <linux/init.h> 46 #include <linux/blkdev.h> 47 #include <linux/blkpg.h> 48 #include <linux/delay.h> 49 #include <linux/mutex.h> 50 #include <linux/string_helpers.h> 51 #include <linux/async.h> 52 #include <linux/slab.h> 53 #include <asm/uaccess.h> 54 #include <asm/unaligned.h> 55 56 #include <scsi/scsi.h> 57 #include <scsi/scsi_cmnd.h> 58 #include <scsi/scsi_dbg.h> 59 #include <scsi/scsi_device.h> 60 #include <scsi/scsi_driver.h> 61 #include <scsi/scsi_eh.h> 62 #include <scsi/scsi_host.h> 63 #include <scsi/scsi_ioctl.h> 64 #include <scsi/scsicam.h> 65 66 #include "sd.h" 67 #include "scsi_logging.h" 68 69 MODULE_AUTHOR("Eric Youngdale"); 70 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 71 MODULE_LICENSE("GPL"); 72 73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 92 93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 94 #define SD_MINORS 16 95 #else 96 #define SD_MINORS 0 97 #endif 98 99 static int sd_revalidate_disk(struct gendisk *); 100 static int sd_probe(struct device *); 101 static int sd_remove(struct device *); 102 static void sd_shutdown(struct device *); 103 static int sd_suspend(struct device *, pm_message_t state); 104 static int sd_resume(struct device *); 105 static void sd_rescan(struct device *); 106 static int sd_done(struct scsi_cmnd *); 107 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 108 static void scsi_disk_release(struct device *cdev); 109 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 110 static void sd_print_result(struct scsi_disk *, int); 111 112 static DEFINE_SPINLOCK(sd_index_lock); 113 static DEFINE_IDA(sd_index_ida); 114 115 /* This semaphore is used to mediate the 0->1 reference get in the 116 * face of object destruction (i.e. we can't allow a get on an 117 * object after last put) */ 118 static DEFINE_MUTEX(sd_ref_mutex); 119 120 struct kmem_cache *sd_cdb_cache; 121 mempool_t *sd_cdb_pool; 122 123 static const char *sd_cache_types[] = { 124 "write through", "none", "write back", 125 "write back, no read (daft)" 126 }; 127 128 static ssize_t 129 sd_store_cache_type(struct device *dev, struct device_attribute *attr, 130 const char *buf, size_t count) 131 { 132 int i, ct = -1, rcd, wce, sp; 133 struct scsi_disk *sdkp = to_scsi_disk(dev); 134 struct scsi_device *sdp = sdkp->device; 135 char buffer[64]; 136 char *buffer_data; 137 struct scsi_mode_data data; 138 struct scsi_sense_hdr sshdr; 139 int len; 140 141 if (sdp->type != TYPE_DISK) 142 /* no cache control on RBC devices; theoretically they 143 * can do it, but there's probably so many exceptions 144 * it's not worth the risk */ 145 return -EINVAL; 146 147 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 148 const int len = strlen(sd_cache_types[i]); 149 if (strncmp(sd_cache_types[i], buf, len) == 0 && 150 buf[len] == '\n') { 151 ct = i; 152 break; 153 } 154 } 155 if (ct < 0) 156 return -EINVAL; 157 rcd = ct & 0x01 ? 1 : 0; 158 wce = ct & 0x02 ? 1 : 0; 159 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 160 SD_MAX_RETRIES, &data, NULL)) 161 return -EINVAL; 162 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 163 data.block_descriptor_length); 164 buffer_data = buffer + data.header_length + 165 data.block_descriptor_length; 166 buffer_data[2] &= ~0x05; 167 buffer_data[2] |= wce << 2 | rcd; 168 sp = buffer_data[0] & 0x80 ? 1 : 0; 169 170 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 171 SD_MAX_RETRIES, &data, &sshdr)) { 172 if (scsi_sense_valid(&sshdr)) 173 sd_print_sense_hdr(sdkp, &sshdr); 174 return -EINVAL; 175 } 176 revalidate_disk(sdkp->disk); 177 return count; 178 } 179 180 static ssize_t 181 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, 182 const char *buf, size_t count) 183 { 184 struct scsi_disk *sdkp = to_scsi_disk(dev); 185 struct scsi_device *sdp = sdkp->device; 186 187 if (!capable(CAP_SYS_ADMIN)) 188 return -EACCES; 189 190 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 191 192 return count; 193 } 194 195 static ssize_t 196 sd_store_allow_restart(struct device *dev, struct device_attribute *attr, 197 const char *buf, size_t count) 198 { 199 struct scsi_disk *sdkp = to_scsi_disk(dev); 200 struct scsi_device *sdp = sdkp->device; 201 202 if (!capable(CAP_SYS_ADMIN)) 203 return -EACCES; 204 205 if (sdp->type != TYPE_DISK) 206 return -EINVAL; 207 208 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 209 210 return count; 211 } 212 213 static ssize_t 214 sd_show_cache_type(struct device *dev, struct device_attribute *attr, 215 char *buf) 216 { 217 struct scsi_disk *sdkp = to_scsi_disk(dev); 218 int ct = sdkp->RCD + 2*sdkp->WCE; 219 220 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 221 } 222 223 static ssize_t 224 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) 225 { 226 struct scsi_disk *sdkp = to_scsi_disk(dev); 227 228 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 229 } 230 231 static ssize_t 232 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, 233 char *buf) 234 { 235 struct scsi_disk *sdkp = to_scsi_disk(dev); 236 struct scsi_device *sdp = sdkp->device; 237 238 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 239 } 240 241 static ssize_t 242 sd_show_allow_restart(struct device *dev, struct device_attribute *attr, 243 char *buf) 244 { 245 struct scsi_disk *sdkp = to_scsi_disk(dev); 246 247 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 248 } 249 250 static ssize_t 251 sd_show_protection_type(struct device *dev, struct device_attribute *attr, 252 char *buf) 253 { 254 struct scsi_disk *sdkp = to_scsi_disk(dev); 255 256 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 257 } 258 259 static ssize_t 260 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, 261 char *buf) 262 { 263 struct scsi_disk *sdkp = to_scsi_disk(dev); 264 265 return snprintf(buf, 20, "%u\n", sdkp->ATO); 266 } 267 268 static ssize_t 269 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, 270 char *buf) 271 { 272 struct scsi_disk *sdkp = to_scsi_disk(dev); 273 274 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning); 275 } 276 277 static struct device_attribute sd_disk_attrs[] = { 278 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 279 sd_store_cache_type), 280 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 281 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 282 sd_store_allow_restart), 283 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 284 sd_store_manage_start_stop), 285 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), 286 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 287 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), 288 __ATTR_NULL, 289 }; 290 291 static struct class sd_disk_class = { 292 .name = "scsi_disk", 293 .owner = THIS_MODULE, 294 .dev_release = scsi_disk_release, 295 .dev_attrs = sd_disk_attrs, 296 }; 297 298 static struct scsi_driver sd_template = { 299 .owner = THIS_MODULE, 300 .gendrv = { 301 .name = "sd", 302 .probe = sd_probe, 303 .remove = sd_remove, 304 .suspend = sd_suspend, 305 .resume = sd_resume, 306 .shutdown = sd_shutdown, 307 }, 308 .rescan = sd_rescan, 309 .done = sd_done, 310 }; 311 312 /* 313 * Device no to disk mapping: 314 * 315 * major disc2 disc p1 316 * |............|.............|....|....| <- dev_t 317 * 31 20 19 8 7 4 3 0 318 * 319 * Inside a major, we have 16k disks, however mapped non- 320 * contiguously. The first 16 disks are for major0, the next 321 * ones with major1, ... Disk 256 is for major0 again, disk 272 322 * for major1, ... 323 * As we stay compatible with our numbering scheme, we can reuse 324 * the well-know SCSI majors 8, 65--71, 136--143. 325 */ 326 static int sd_major(int major_idx) 327 { 328 switch (major_idx) { 329 case 0: 330 return SCSI_DISK0_MAJOR; 331 case 1 ... 7: 332 return SCSI_DISK1_MAJOR + major_idx - 1; 333 case 8 ... 15: 334 return SCSI_DISK8_MAJOR + major_idx - 8; 335 default: 336 BUG(); 337 return 0; /* shut up gcc */ 338 } 339 } 340 341 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 342 { 343 struct scsi_disk *sdkp = NULL; 344 345 if (disk->private_data) { 346 sdkp = scsi_disk(disk); 347 if (scsi_device_get(sdkp->device) == 0) 348 get_device(&sdkp->dev); 349 else 350 sdkp = NULL; 351 } 352 return sdkp; 353 } 354 355 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 356 { 357 struct scsi_disk *sdkp; 358 359 mutex_lock(&sd_ref_mutex); 360 sdkp = __scsi_disk_get(disk); 361 mutex_unlock(&sd_ref_mutex); 362 return sdkp; 363 } 364 365 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 366 { 367 struct scsi_disk *sdkp; 368 369 mutex_lock(&sd_ref_mutex); 370 sdkp = dev_get_drvdata(dev); 371 if (sdkp) 372 sdkp = __scsi_disk_get(sdkp->disk); 373 mutex_unlock(&sd_ref_mutex); 374 return sdkp; 375 } 376 377 static void scsi_disk_put(struct scsi_disk *sdkp) 378 { 379 struct scsi_device *sdev = sdkp->device; 380 381 mutex_lock(&sd_ref_mutex); 382 put_device(&sdkp->dev); 383 scsi_device_put(sdev); 384 mutex_unlock(&sd_ref_mutex); 385 } 386 387 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) 388 { 389 unsigned int prot_op = SCSI_PROT_NORMAL; 390 unsigned int dix = scsi_prot_sg_count(scmd); 391 392 if (scmd->sc_data_direction == DMA_FROM_DEVICE) { 393 if (dif && dix) 394 prot_op = SCSI_PROT_READ_PASS; 395 else if (dif && !dix) 396 prot_op = SCSI_PROT_READ_STRIP; 397 else if (!dif && dix) 398 prot_op = SCSI_PROT_READ_INSERT; 399 } else { 400 if (dif && dix) 401 prot_op = SCSI_PROT_WRITE_PASS; 402 else if (dif && !dix) 403 prot_op = SCSI_PROT_WRITE_INSERT; 404 else if (!dif && dix) 405 prot_op = SCSI_PROT_WRITE_STRIP; 406 } 407 408 scsi_set_prot_op(scmd, prot_op); 409 scsi_set_prot_type(scmd, dif); 410 } 411 412 /** 413 * sd_prepare_discard - unmap blocks on thinly provisioned device 414 * @rq: Request to prepare 415 * 416 * Will issue either UNMAP or WRITE SAME(16) depending on preference 417 * indicated by target device. 418 **/ 419 static int sd_prepare_discard(struct request *rq) 420 { 421 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); 422 struct bio *bio = rq->bio; 423 sector_t sector = bio->bi_sector; 424 unsigned int num = bio_sectors(bio); 425 426 if (sdkp->device->sector_size == 4096) { 427 sector >>= 3; 428 num >>= 3; 429 } 430 431 rq->cmd_type = REQ_TYPE_BLOCK_PC; 432 rq->timeout = SD_TIMEOUT; 433 434 memset(rq->cmd, 0, rq->cmd_len); 435 436 if (sdkp->unmap) { 437 char *buf = kmap_atomic(bio_page(bio), KM_USER0); 438 439 rq->cmd[0] = UNMAP; 440 rq->cmd[8] = 24; 441 rq->cmd_len = 10; 442 443 /* Ensure that data length matches payload */ 444 rq->__data_len = bio->bi_size = bio->bi_io_vec->bv_len = 24; 445 446 put_unaligned_be16(6 + 16, &buf[0]); 447 put_unaligned_be16(16, &buf[2]); 448 put_unaligned_be64(sector, &buf[8]); 449 put_unaligned_be32(num, &buf[16]); 450 451 kunmap_atomic(buf, KM_USER0); 452 } else { 453 rq->cmd[0] = WRITE_SAME_16; 454 rq->cmd[1] = 0x8; /* UNMAP */ 455 put_unaligned_be64(sector, &rq->cmd[2]); 456 put_unaligned_be32(num, &rq->cmd[10]); 457 rq->cmd_len = 16; 458 } 459 460 return BLKPREP_OK; 461 } 462 463 /** 464 * sd_init_command - build a scsi (read or write) command from 465 * information in the request structure. 466 * @SCpnt: pointer to mid-level's per scsi command structure that 467 * contains request and into which the scsi command is written 468 * 469 * Returns 1 if successful and 0 if error (or cannot be done now). 470 **/ 471 static int sd_prep_fn(struct request_queue *q, struct request *rq) 472 { 473 struct scsi_cmnd *SCpnt; 474 struct scsi_device *sdp = q->queuedata; 475 struct gendisk *disk = rq->rq_disk; 476 struct scsi_disk *sdkp; 477 sector_t block = blk_rq_pos(rq); 478 sector_t threshold; 479 unsigned int this_count = blk_rq_sectors(rq); 480 int ret, host_dif; 481 unsigned char protect; 482 483 /* 484 * Discard request come in as REQ_TYPE_FS but we turn them into 485 * block PC requests to make life easier. 486 */ 487 if (blk_discard_rq(rq)) 488 ret = sd_prepare_discard(rq); 489 490 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 491 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 492 goto out; 493 } else if (rq->cmd_type != REQ_TYPE_FS) { 494 ret = BLKPREP_KILL; 495 goto out; 496 } 497 ret = scsi_setup_fs_cmnd(sdp, rq); 498 if (ret != BLKPREP_OK) 499 goto out; 500 SCpnt = rq->special; 501 sdkp = scsi_disk(disk); 502 503 /* from here on until we're complete, any goto out 504 * is used for a killable error condition */ 505 ret = BLKPREP_KILL; 506 507 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 508 "sd_init_command: block=%llu, " 509 "count=%d\n", 510 (unsigned long long)block, 511 this_count)); 512 513 if (!sdp || !scsi_device_online(sdp) || 514 block + blk_rq_sectors(rq) > get_capacity(disk)) { 515 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 516 "Finishing %u sectors\n", 517 blk_rq_sectors(rq))); 518 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 519 "Retry with 0x%p\n", SCpnt)); 520 goto out; 521 } 522 523 if (sdp->changed) { 524 /* 525 * quietly refuse to do anything to a changed disc until 526 * the changed bit has been reset 527 */ 528 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ 529 goto out; 530 } 531 532 /* 533 * Some SD card readers can't handle multi-sector accesses which touch 534 * the last one or two hardware sectors. Split accesses as needed. 535 */ 536 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 537 (sdp->sector_size / 512); 538 539 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 540 if (block < threshold) { 541 /* Access up to the threshold but not beyond */ 542 this_count = threshold - block; 543 } else { 544 /* Access only a single hardware sector */ 545 this_count = sdp->sector_size / 512; 546 } 547 } 548 549 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 550 (unsigned long long)block)); 551 552 /* 553 * If we have a 1K hardware sectorsize, prevent access to single 554 * 512 byte sectors. In theory we could handle this - in fact 555 * the scsi cdrom driver must be able to handle this because 556 * we typically use 1K blocksizes, and cdroms typically have 557 * 2K hardware sectorsizes. Of course, things are simpler 558 * with the cdrom, since it is read-only. For performance 559 * reasons, the filesystems should be able to handle this 560 * and not force the scsi disk driver to use bounce buffers 561 * for this. 562 */ 563 if (sdp->sector_size == 1024) { 564 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 565 scmd_printk(KERN_ERR, SCpnt, 566 "Bad block number requested\n"); 567 goto out; 568 } else { 569 block = block >> 1; 570 this_count = this_count >> 1; 571 } 572 } 573 if (sdp->sector_size == 2048) { 574 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 575 scmd_printk(KERN_ERR, SCpnt, 576 "Bad block number requested\n"); 577 goto out; 578 } else { 579 block = block >> 2; 580 this_count = this_count >> 2; 581 } 582 } 583 if (sdp->sector_size == 4096) { 584 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 585 scmd_printk(KERN_ERR, SCpnt, 586 "Bad block number requested\n"); 587 goto out; 588 } else { 589 block = block >> 3; 590 this_count = this_count >> 3; 591 } 592 } 593 if (rq_data_dir(rq) == WRITE) { 594 if (!sdp->writeable) { 595 goto out; 596 } 597 SCpnt->cmnd[0] = WRITE_6; 598 SCpnt->sc_data_direction = DMA_TO_DEVICE; 599 600 if (blk_integrity_rq(rq) && 601 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) 602 goto out; 603 604 } else if (rq_data_dir(rq) == READ) { 605 SCpnt->cmnd[0] = READ_6; 606 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 607 } else { 608 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 609 goto out; 610 } 611 612 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 613 "%s %d/%u 512 byte blocks.\n", 614 (rq_data_dir(rq) == WRITE) ? 615 "writing" : "reading", this_count, 616 blk_rq_sectors(rq))); 617 618 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ 619 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 620 if (host_dif) 621 protect = 1 << 5; 622 else 623 protect = 0; 624 625 if (host_dif == SD_DIF_TYPE2_PROTECTION) { 626 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); 627 628 if (unlikely(SCpnt->cmnd == NULL)) { 629 ret = BLKPREP_DEFER; 630 goto out; 631 } 632 633 SCpnt->cmd_len = SD_EXT_CDB_SIZE; 634 memset(SCpnt->cmnd, 0, SCpnt->cmd_len); 635 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; 636 SCpnt->cmnd[7] = 0x18; 637 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; 638 SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0); 639 640 /* LBA */ 641 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 642 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 643 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 644 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 645 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; 646 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; 647 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; 648 SCpnt->cmnd[19] = (unsigned char) block & 0xff; 649 650 /* Expected Indirect LBA */ 651 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; 652 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; 653 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; 654 SCpnt->cmnd[23] = (unsigned char) block & 0xff; 655 656 /* Transfer length */ 657 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; 658 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; 659 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; 660 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; 661 } else if (block > 0xffffffff) { 662 SCpnt->cmnd[0] += READ_16 - READ_6; 663 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0); 664 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 665 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 666 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 667 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 668 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 669 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 670 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 671 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 672 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 673 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 674 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 675 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 676 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 677 } else if ((this_count > 0xff) || (block > 0x1fffff) || 678 scsi_device_protection(SCpnt->device) || 679 SCpnt->device->use_10_for_rw) { 680 if (this_count > 0xffff) 681 this_count = 0xffff; 682 683 SCpnt->cmnd[0] += READ_10 - READ_6; 684 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0); 685 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 686 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 687 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 688 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 689 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 690 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 691 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 692 } else { 693 if (unlikely(blk_fua_rq(rq))) { 694 /* 695 * This happens only if this drive failed 696 * 10byte rw command with ILLEGAL_REQUEST 697 * during operation and thus turned off 698 * use_10_for_rw. 699 */ 700 scmd_printk(KERN_ERR, SCpnt, 701 "FUA write on READ/WRITE(6) drive\n"); 702 goto out; 703 } 704 705 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 706 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 707 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 708 SCpnt->cmnd[4] = (unsigned char) this_count; 709 SCpnt->cmnd[5] = 0; 710 } 711 SCpnt->sdb.length = this_count * sdp->sector_size; 712 713 /* If DIF or DIX is enabled, tell HBA how to handle request */ 714 if (host_dif || scsi_prot_sg_count(SCpnt)) 715 sd_prot_op(SCpnt, host_dif); 716 717 /* 718 * We shouldn't disconnect in the middle of a sector, so with a dumb 719 * host adapter, it's safe to assume that we can at least transfer 720 * this many bytes between each connect / disconnect. 721 */ 722 SCpnt->transfersize = sdp->sector_size; 723 SCpnt->underflow = this_count << 9; 724 SCpnt->allowed = SD_MAX_RETRIES; 725 726 /* 727 * This indicates that the command is ready from our end to be 728 * queued. 729 */ 730 ret = BLKPREP_OK; 731 out: 732 return scsi_prep_return(q, rq, ret); 733 } 734 735 /** 736 * sd_open - open a scsi disk device 737 * @inode: only i_rdev member may be used 738 * @filp: only f_mode and f_flags may be used 739 * 740 * Returns 0 if successful. Returns a negated errno value in case 741 * of error. 742 * 743 * Note: This can be called from a user context (e.g. fsck(1) ) 744 * or from within the kernel (e.g. as a result of a mount(1) ). 745 * In the latter case @inode and @filp carry an abridged amount 746 * of information as noted above. 747 **/ 748 static int sd_open(struct block_device *bdev, fmode_t mode) 749 { 750 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 751 struct scsi_device *sdev; 752 int retval; 753 754 if (!sdkp) 755 return -ENXIO; 756 757 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 758 759 sdev = sdkp->device; 760 761 /* 762 * If the device is in error recovery, wait until it is done. 763 * If the device is offline, then disallow any access to it. 764 */ 765 retval = -ENXIO; 766 if (!scsi_block_when_processing_errors(sdev)) 767 goto error_out; 768 769 if (sdev->removable || sdkp->write_prot) 770 check_disk_change(bdev); 771 772 /* 773 * If the drive is empty, just let the open fail. 774 */ 775 retval = -ENOMEDIUM; 776 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 777 goto error_out; 778 779 /* 780 * If the device has the write protect tab set, have the open fail 781 * if the user expects to be able to write to the thing. 782 */ 783 retval = -EROFS; 784 if (sdkp->write_prot && (mode & FMODE_WRITE)) 785 goto error_out; 786 787 /* 788 * It is possible that the disk changing stuff resulted in 789 * the device being taken offline. If this is the case, 790 * report this to the user, and don't pretend that the 791 * open actually succeeded. 792 */ 793 retval = -ENXIO; 794 if (!scsi_device_online(sdev)) 795 goto error_out; 796 797 if (!sdkp->openers++ && sdev->removable) { 798 if (scsi_block_when_processing_errors(sdev)) 799 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 800 } 801 802 return 0; 803 804 error_out: 805 scsi_disk_put(sdkp); 806 return retval; 807 } 808 809 /** 810 * sd_release - invoked when the (last) close(2) is called on this 811 * scsi disk. 812 * @inode: only i_rdev member may be used 813 * @filp: only f_mode and f_flags may be used 814 * 815 * Returns 0. 816 * 817 * Note: may block (uninterruptible) if error recovery is underway 818 * on this disk. 819 **/ 820 static int sd_release(struct gendisk *disk, fmode_t mode) 821 { 822 struct scsi_disk *sdkp = scsi_disk(disk); 823 struct scsi_device *sdev = sdkp->device; 824 825 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 826 827 if (!--sdkp->openers && sdev->removable) { 828 if (scsi_block_when_processing_errors(sdev)) 829 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 830 } 831 832 /* 833 * XXX and what if there are packets in flight and this close() 834 * XXX is followed by a "rmmod sd_mod"? 835 */ 836 scsi_disk_put(sdkp); 837 return 0; 838 } 839 840 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 841 { 842 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 843 struct scsi_device *sdp = sdkp->device; 844 struct Scsi_Host *host = sdp->host; 845 int diskinfo[4]; 846 847 /* default to most commonly used values */ 848 diskinfo[0] = 0x40; /* 1 << 6 */ 849 diskinfo[1] = 0x20; /* 1 << 5 */ 850 diskinfo[2] = sdkp->capacity >> 11; 851 852 /* override with calculated, extended default, or driver values */ 853 if (host->hostt->bios_param) 854 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 855 else 856 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 857 858 geo->heads = diskinfo[0]; 859 geo->sectors = diskinfo[1]; 860 geo->cylinders = diskinfo[2]; 861 return 0; 862 } 863 864 /** 865 * sd_ioctl - process an ioctl 866 * @inode: only i_rdev/i_bdev members may be used 867 * @filp: only f_mode and f_flags may be used 868 * @cmd: ioctl command number 869 * @arg: this is third argument given to ioctl(2) system call. 870 * Often contains a pointer. 871 * 872 * Returns 0 if successful (some ioctls return postive numbers on 873 * success as well). Returns a negated errno value in case of error. 874 * 875 * Note: most ioctls are forward onto the block subsystem or further 876 * down in the scsi subsystem. 877 **/ 878 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 879 unsigned int cmd, unsigned long arg) 880 { 881 struct gendisk *disk = bdev->bd_disk; 882 struct scsi_device *sdp = scsi_disk(disk)->device; 883 void __user *p = (void __user *)arg; 884 int error; 885 886 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 887 disk->disk_name, cmd)); 888 889 /* 890 * If we are in the middle of error recovery, don't let anyone 891 * else try and use this device. Also, if error recovery fails, it 892 * may try and take the device offline, in which case all further 893 * access to the device is prohibited. 894 */ 895 error = scsi_nonblockable_ioctl(sdp, cmd, p, 896 (mode & FMODE_NDELAY) != 0); 897 if (!scsi_block_when_processing_errors(sdp) || !error) 898 return error; 899 900 /* 901 * Send SCSI addressing ioctls directly to mid level, send other 902 * ioctls to block level and then onto mid level if they can't be 903 * resolved. 904 */ 905 switch (cmd) { 906 case SCSI_IOCTL_GET_IDLUN: 907 case SCSI_IOCTL_GET_BUS_NUMBER: 908 return scsi_ioctl(sdp, cmd, p); 909 default: 910 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); 911 if (error != -ENOTTY) 912 return error; 913 } 914 return scsi_ioctl(sdp, cmd, p); 915 } 916 917 static void set_media_not_present(struct scsi_disk *sdkp) 918 { 919 sdkp->media_present = 0; 920 sdkp->capacity = 0; 921 sdkp->device->changed = 1; 922 } 923 924 /** 925 * sd_media_changed - check if our medium changed 926 * @disk: kernel device descriptor 927 * 928 * Returns 0 if not applicable or no change; 1 if change 929 * 930 * Note: this function is invoked from the block subsystem. 931 **/ 932 static int sd_media_changed(struct gendisk *disk) 933 { 934 struct scsi_disk *sdkp = scsi_disk(disk); 935 struct scsi_device *sdp = sdkp->device; 936 struct scsi_sense_hdr *sshdr = NULL; 937 int retval; 938 939 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); 940 941 if (!sdp->removable) 942 return 0; 943 944 /* 945 * If the device is offline, don't send any commands - just pretend as 946 * if the command failed. If the device ever comes back online, we 947 * can deal with it then. It is only because of unrecoverable errors 948 * that we would ever take a device offline in the first place. 949 */ 950 if (!scsi_device_online(sdp)) { 951 set_media_not_present(sdkp); 952 retval = 1; 953 goto out; 954 } 955 956 /* 957 * Using TEST_UNIT_READY enables differentiation between drive with 958 * no cartridge loaded - NOT READY, drive with changed cartridge - 959 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 960 * 961 * Drives that auto spin down. eg iomega jaz 1G, will be started 962 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 963 * sd_revalidate() is called. 964 */ 965 retval = -ENODEV; 966 967 if (scsi_block_when_processing_errors(sdp)) { 968 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 969 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 970 sshdr); 971 } 972 973 /* 974 * Unable to test, unit probably not ready. This usually 975 * means there is no disc in the drive. Mark as changed, 976 * and we will figure it out later once the drive is 977 * available again. 978 */ 979 if (retval || (scsi_sense_valid(sshdr) && 980 /* 0x3a is medium not present */ 981 sshdr->asc == 0x3a)) { 982 set_media_not_present(sdkp); 983 retval = 1; 984 goto out; 985 } 986 987 /* 988 * For removable scsi disk we have to recognise the presence 989 * of a disk in the drive. This is kept in the struct scsi_disk 990 * struct and tested at open ! Daniel Roche (dan@lectra.fr) 991 */ 992 sdkp->media_present = 1; 993 994 retval = sdp->changed; 995 sdp->changed = 0; 996 out: 997 if (retval != sdkp->previous_state) 998 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); 999 sdkp->previous_state = retval; 1000 kfree(sshdr); 1001 return retval; 1002 } 1003 1004 static int sd_sync_cache(struct scsi_disk *sdkp) 1005 { 1006 int retries, res; 1007 struct scsi_device *sdp = sdkp->device; 1008 struct scsi_sense_hdr sshdr; 1009 1010 if (!scsi_device_online(sdp)) 1011 return -ENODEV; 1012 1013 1014 for (retries = 3; retries > 0; --retries) { 1015 unsigned char cmd[10] = { 0 }; 1016 1017 cmd[0] = SYNCHRONIZE_CACHE; 1018 /* 1019 * Leave the rest of the command zero to indicate 1020 * flush everything. 1021 */ 1022 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 1023 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1024 if (res == 0) 1025 break; 1026 } 1027 1028 if (res) { 1029 sd_print_result(sdkp, res); 1030 if (driver_byte(res) & DRIVER_SENSE) 1031 sd_print_sense_hdr(sdkp, &sshdr); 1032 } 1033 1034 if (res) 1035 return -EIO; 1036 return 0; 1037 } 1038 1039 static void sd_prepare_flush(struct request_queue *q, struct request *rq) 1040 { 1041 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1042 rq->timeout = SD_TIMEOUT; 1043 rq->retries = SD_MAX_RETRIES; 1044 rq->cmd[0] = SYNCHRONIZE_CACHE; 1045 rq->cmd_len = 10; 1046 } 1047 1048 static void sd_rescan(struct device *dev) 1049 { 1050 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1051 1052 if (sdkp) { 1053 revalidate_disk(sdkp->disk); 1054 scsi_disk_put(sdkp); 1055 } 1056 } 1057 1058 1059 #ifdef CONFIG_COMPAT 1060 /* 1061 * This gets directly called from VFS. When the ioctl 1062 * is not recognized we go back to the other translation paths. 1063 */ 1064 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1065 unsigned int cmd, unsigned long arg) 1066 { 1067 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1068 1069 /* 1070 * If we are in the middle of error recovery, don't let anyone 1071 * else try and use this device. Also, if error recovery fails, it 1072 * may try and take the device offline, in which case all further 1073 * access to the device is prohibited. 1074 */ 1075 if (!scsi_block_when_processing_errors(sdev)) 1076 return -ENODEV; 1077 1078 if (sdev->host->hostt->compat_ioctl) { 1079 int ret; 1080 1081 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1082 1083 return ret; 1084 } 1085 1086 /* 1087 * Let the static ioctl translation table take care of it. 1088 */ 1089 return -ENOIOCTLCMD; 1090 } 1091 #endif 1092 1093 static const struct block_device_operations sd_fops = { 1094 .owner = THIS_MODULE, 1095 .open = sd_open, 1096 .release = sd_release, 1097 .locked_ioctl = sd_ioctl, 1098 .getgeo = sd_getgeo, 1099 #ifdef CONFIG_COMPAT 1100 .compat_ioctl = sd_compat_ioctl, 1101 #endif 1102 .media_changed = sd_media_changed, 1103 .revalidate_disk = sd_revalidate_disk, 1104 }; 1105 1106 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1107 { 1108 u64 start_lba = blk_rq_pos(scmd->request); 1109 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1110 u64 bad_lba; 1111 int info_valid; 1112 1113 if (!blk_fs_request(scmd->request)) 1114 return 0; 1115 1116 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1117 SCSI_SENSE_BUFFERSIZE, 1118 &bad_lba); 1119 if (!info_valid) 1120 return 0; 1121 1122 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1123 return 0; 1124 1125 if (scmd->device->sector_size < 512) { 1126 /* only legitimate sector_size here is 256 */ 1127 start_lba <<= 1; 1128 end_lba <<= 1; 1129 } else { 1130 /* be careful ... don't want any overflows */ 1131 u64 factor = scmd->device->sector_size / 512; 1132 do_div(start_lba, factor); 1133 do_div(end_lba, factor); 1134 } 1135 1136 /* The bad lba was reported incorrectly, we have no idea where 1137 * the error is. 1138 */ 1139 if (bad_lba < start_lba || bad_lba >= end_lba) 1140 return 0; 1141 1142 /* This computation should always be done in terms of 1143 * the resolution of the device's medium. 1144 */ 1145 return (bad_lba - start_lba) * scmd->device->sector_size; 1146 } 1147 1148 /** 1149 * sd_done - bottom half handler: called when the lower level 1150 * driver has completed (successfully or otherwise) a scsi command. 1151 * @SCpnt: mid-level's per command structure. 1152 * 1153 * Note: potentially run from within an ISR. Must not block. 1154 **/ 1155 static int sd_done(struct scsi_cmnd *SCpnt) 1156 { 1157 int result = SCpnt->result; 1158 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1159 struct scsi_sense_hdr sshdr; 1160 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1161 int sense_valid = 0; 1162 int sense_deferred = 0; 1163 1164 if (result) { 1165 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1166 if (sense_valid) 1167 sense_deferred = scsi_sense_is_deferred(&sshdr); 1168 } 1169 #ifdef CONFIG_SCSI_LOGGING 1170 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1171 if (sense_valid) { 1172 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1173 "sd_done: sb[respc,sk,asc," 1174 "ascq]=%x,%x,%x,%x\n", 1175 sshdr.response_code, 1176 sshdr.sense_key, sshdr.asc, 1177 sshdr.ascq)); 1178 } 1179 #endif 1180 if (driver_byte(result) != DRIVER_SENSE && 1181 (!sense_valid || sense_deferred)) 1182 goto out; 1183 1184 switch (sshdr.sense_key) { 1185 case HARDWARE_ERROR: 1186 case MEDIUM_ERROR: 1187 good_bytes = sd_completed_bytes(SCpnt); 1188 break; 1189 case RECOVERED_ERROR: 1190 good_bytes = scsi_bufflen(SCpnt); 1191 break; 1192 case NO_SENSE: 1193 /* This indicates a false check condition, so ignore it. An 1194 * unknown amount of data was transferred so treat it as an 1195 * error. 1196 */ 1197 scsi_print_sense("sd", SCpnt); 1198 SCpnt->result = 0; 1199 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1200 break; 1201 case ABORTED_COMMAND: /* DIF: Target detected corruption */ 1202 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */ 1203 if (sshdr.asc == 0x10) 1204 good_bytes = sd_completed_bytes(SCpnt); 1205 break; 1206 default: 1207 break; 1208 } 1209 out: 1210 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1211 sd_dif_complete(SCpnt, good_bytes); 1212 1213 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) 1214 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { 1215 1216 /* We have to print a failed command here as the 1217 * extended CDB gets freed before scsi_io_completion() 1218 * is called. 1219 */ 1220 if (result) 1221 scsi_print_command(SCpnt); 1222 1223 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1224 SCpnt->cmnd = NULL; 1225 SCpnt->cmd_len = 0; 1226 } 1227 1228 return good_bytes; 1229 } 1230 1231 static int media_not_present(struct scsi_disk *sdkp, 1232 struct scsi_sense_hdr *sshdr) 1233 { 1234 1235 if (!scsi_sense_valid(sshdr)) 1236 return 0; 1237 /* not invoked for commands that could return deferred errors */ 1238 if (sshdr->sense_key != NOT_READY && 1239 sshdr->sense_key != UNIT_ATTENTION) 1240 return 0; 1241 if (sshdr->asc != 0x3A) /* medium not present */ 1242 return 0; 1243 1244 set_media_not_present(sdkp); 1245 return 1; 1246 } 1247 1248 /* 1249 * spinup disk - called only in sd_revalidate_disk() 1250 */ 1251 static void 1252 sd_spinup_disk(struct scsi_disk *sdkp) 1253 { 1254 unsigned char cmd[10]; 1255 unsigned long spintime_expire = 0; 1256 int retries, spintime; 1257 unsigned int the_result; 1258 struct scsi_sense_hdr sshdr; 1259 int sense_valid = 0; 1260 1261 spintime = 0; 1262 1263 /* Spin up drives, as required. Only do this at boot time */ 1264 /* Spinup needs to be done for module loads too. */ 1265 do { 1266 retries = 0; 1267 1268 do { 1269 cmd[0] = TEST_UNIT_READY; 1270 memset((void *) &cmd[1], 0, 9); 1271 1272 the_result = scsi_execute_req(sdkp->device, cmd, 1273 DMA_NONE, NULL, 0, 1274 &sshdr, SD_TIMEOUT, 1275 SD_MAX_RETRIES, NULL); 1276 1277 /* 1278 * If the drive has indicated to us that it 1279 * doesn't have any media in it, don't bother 1280 * with any more polling. 1281 */ 1282 if (media_not_present(sdkp, &sshdr)) 1283 return; 1284 1285 if (the_result) 1286 sense_valid = scsi_sense_valid(&sshdr); 1287 retries++; 1288 } while (retries < 3 && 1289 (!scsi_status_is_good(the_result) || 1290 ((driver_byte(the_result) & DRIVER_SENSE) && 1291 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1292 1293 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1294 /* no sense, TUR either succeeded or failed 1295 * with a status error */ 1296 if(!spintime && !scsi_status_is_good(the_result)) { 1297 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1298 sd_print_result(sdkp, the_result); 1299 } 1300 break; 1301 } 1302 1303 /* 1304 * The device does not want the automatic start to be issued. 1305 */ 1306 if (sdkp->device->no_start_on_add) 1307 break; 1308 1309 if (sense_valid && sshdr.sense_key == NOT_READY) { 1310 if (sshdr.asc == 4 && sshdr.ascq == 3) 1311 break; /* manual intervention required */ 1312 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1313 break; /* standby */ 1314 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1315 break; /* unavailable */ 1316 /* 1317 * Issue command to spin up drive when not ready 1318 */ 1319 if (!spintime) { 1320 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1321 cmd[0] = START_STOP; 1322 cmd[1] = 1; /* Return immediately */ 1323 memset((void *) &cmd[2], 0, 8); 1324 cmd[4] = 1; /* Start spin cycle */ 1325 if (sdkp->device->start_stop_pwr_cond) 1326 cmd[4] |= 1 << 4; 1327 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1328 NULL, 0, &sshdr, 1329 SD_TIMEOUT, SD_MAX_RETRIES, 1330 NULL); 1331 spintime_expire = jiffies + 100 * HZ; 1332 spintime = 1; 1333 } 1334 /* Wait 1 second for next try */ 1335 msleep(1000); 1336 printk("."); 1337 1338 /* 1339 * Wait for USB flash devices with slow firmware. 1340 * Yes, this sense key/ASC combination shouldn't 1341 * occur here. It's characteristic of these devices. 1342 */ 1343 } else if (sense_valid && 1344 sshdr.sense_key == UNIT_ATTENTION && 1345 sshdr.asc == 0x28) { 1346 if (!spintime) { 1347 spintime_expire = jiffies + 5 * HZ; 1348 spintime = 1; 1349 } 1350 /* Wait 1 second for next try */ 1351 msleep(1000); 1352 } else { 1353 /* we don't understand the sense code, so it's 1354 * probably pointless to loop */ 1355 if(!spintime) { 1356 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1357 sd_print_sense_hdr(sdkp, &sshdr); 1358 } 1359 break; 1360 } 1361 1362 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1363 1364 if (spintime) { 1365 if (scsi_status_is_good(the_result)) 1366 printk("ready\n"); 1367 else 1368 printk("not responding...\n"); 1369 } 1370 } 1371 1372 1373 /* 1374 * Determine whether disk supports Data Integrity Field. 1375 */ 1376 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1377 { 1378 struct scsi_device *sdp = sdkp->device; 1379 u8 type; 1380 1381 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1382 return; 1383 1384 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1385 1386 if (type == sdkp->protection_type || !sdkp->first_scan) 1387 return; 1388 1389 sdkp->protection_type = type; 1390 1391 if (type > SD_DIF_TYPE3_PROTECTION) { 1392 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \ 1393 "protection type %u. Disabling disk!\n", type); 1394 sdkp->capacity = 0; 1395 return; 1396 } 1397 1398 if (scsi_host_dif_capable(sdp->host, type)) 1399 sd_printk(KERN_NOTICE, sdkp, 1400 "Enabling DIF Type %u protection\n", type); 1401 else 1402 sd_printk(KERN_NOTICE, sdkp, 1403 "Disabling DIF Type %u protection\n", type); 1404 } 1405 1406 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1407 struct scsi_sense_hdr *sshdr, int sense_valid, 1408 int the_result) 1409 { 1410 sd_print_result(sdkp, the_result); 1411 if (driver_byte(the_result) & DRIVER_SENSE) 1412 sd_print_sense_hdr(sdkp, sshdr); 1413 else 1414 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1415 1416 /* 1417 * Set dirty bit for removable devices if not ready - 1418 * sometimes drives will not report this properly. 1419 */ 1420 if (sdp->removable && 1421 sense_valid && sshdr->sense_key == NOT_READY) 1422 sdp->changed = 1; 1423 1424 /* 1425 * We used to set media_present to 0 here to indicate no media 1426 * in the drive, but some drives fail read capacity even with 1427 * media present, so we can't do that. 1428 */ 1429 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1430 } 1431 1432 #define RC16_LEN 32 1433 #if RC16_LEN > SD_BUF_SIZE 1434 #error RC16_LEN must not be more than SD_BUF_SIZE 1435 #endif 1436 1437 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1438 unsigned char *buffer) 1439 { 1440 unsigned char cmd[16]; 1441 struct scsi_sense_hdr sshdr; 1442 int sense_valid = 0; 1443 int the_result; 1444 int retries = 3; 1445 unsigned int alignment; 1446 unsigned long long lba; 1447 unsigned sector_size; 1448 1449 do { 1450 memset(cmd, 0, 16); 1451 cmd[0] = SERVICE_ACTION_IN; 1452 cmd[1] = SAI_READ_CAPACITY_16; 1453 cmd[13] = RC16_LEN; 1454 memset(buffer, 0, RC16_LEN); 1455 1456 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1457 buffer, RC16_LEN, &sshdr, 1458 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1459 1460 if (media_not_present(sdkp, &sshdr)) 1461 return -ENODEV; 1462 1463 if (the_result) { 1464 sense_valid = scsi_sense_valid(&sshdr); 1465 if (sense_valid && 1466 sshdr.sense_key == ILLEGAL_REQUEST && 1467 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1468 sshdr.ascq == 0x00) 1469 /* Invalid Command Operation Code or 1470 * Invalid Field in CDB, just retry 1471 * silently with RC10 */ 1472 return -EINVAL; 1473 } 1474 retries--; 1475 1476 } while (the_result && retries); 1477 1478 if (the_result) { 1479 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1480 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1481 return -EINVAL; 1482 } 1483 1484 sector_size = get_unaligned_be32(&buffer[8]); 1485 lba = get_unaligned_be64(&buffer[0]); 1486 1487 sd_read_protection_type(sdkp, buffer); 1488 1489 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1490 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1491 "kernel compiled with support for large block " 1492 "devices.\n"); 1493 sdkp->capacity = 0; 1494 return -EOVERFLOW; 1495 } 1496 1497 /* Logical blocks per physical block exponent */ 1498 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size; 1499 1500 /* Lowest aligned logical block */ 1501 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 1502 blk_queue_alignment_offset(sdp->request_queue, alignment); 1503 if (alignment && sdkp->first_scan) 1504 sd_printk(KERN_NOTICE, sdkp, 1505 "physical block alignment offset: %u\n", alignment); 1506 1507 if (buffer[14] & 0x80) { /* TPE */ 1508 struct request_queue *q = sdp->request_queue; 1509 1510 sdkp->thin_provisioning = 1; 1511 q->limits.discard_granularity = sdkp->hw_sector_size; 1512 q->limits.max_discard_sectors = 0xffffffff; 1513 1514 if (buffer[14] & 0x40) /* TPRZ */ 1515 q->limits.discard_zeroes_data = 1; 1516 1517 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 1518 } 1519 1520 sdkp->capacity = lba + 1; 1521 return sector_size; 1522 } 1523 1524 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 1525 unsigned char *buffer) 1526 { 1527 unsigned char cmd[16]; 1528 struct scsi_sense_hdr sshdr; 1529 int sense_valid = 0; 1530 int the_result; 1531 int retries = 3; 1532 sector_t lba; 1533 unsigned sector_size; 1534 1535 do { 1536 cmd[0] = READ_CAPACITY; 1537 memset(&cmd[1], 0, 9); 1538 memset(buffer, 0, 8); 1539 1540 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1541 buffer, 8, &sshdr, 1542 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1543 1544 if (media_not_present(sdkp, &sshdr)) 1545 return -ENODEV; 1546 1547 if (the_result) 1548 sense_valid = scsi_sense_valid(&sshdr); 1549 retries--; 1550 1551 } while (the_result && retries); 1552 1553 if (the_result) { 1554 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1555 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1556 return -EINVAL; 1557 } 1558 1559 sector_size = get_unaligned_be32(&buffer[4]); 1560 lba = get_unaligned_be32(&buffer[0]); 1561 1562 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 1563 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1564 "kernel compiled with support for large block " 1565 "devices.\n"); 1566 sdkp->capacity = 0; 1567 return -EOVERFLOW; 1568 } 1569 1570 sdkp->capacity = lba + 1; 1571 sdkp->hw_sector_size = sector_size; 1572 return sector_size; 1573 } 1574 1575 static int sd_try_rc16_first(struct scsi_device *sdp) 1576 { 1577 if (sdp->scsi_level > SCSI_SPC_2) 1578 return 1; 1579 if (scsi_device_protection(sdp)) 1580 return 1; 1581 return 0; 1582 } 1583 1584 /* 1585 * read disk capacity 1586 */ 1587 static void 1588 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1589 { 1590 int sector_size; 1591 struct scsi_device *sdp = sdkp->device; 1592 sector_t old_capacity = sdkp->capacity; 1593 1594 if (sd_try_rc16_first(sdp)) { 1595 sector_size = read_capacity_16(sdkp, sdp, buffer); 1596 if (sector_size == -EOVERFLOW) 1597 goto got_data; 1598 if (sector_size == -ENODEV) 1599 return; 1600 if (sector_size < 0) 1601 sector_size = read_capacity_10(sdkp, sdp, buffer); 1602 if (sector_size < 0) 1603 return; 1604 } else { 1605 sector_size = read_capacity_10(sdkp, sdp, buffer); 1606 if (sector_size == -EOVERFLOW) 1607 goto got_data; 1608 if (sector_size < 0) 1609 return; 1610 if ((sizeof(sdkp->capacity) > 4) && 1611 (sdkp->capacity > 0xffffffffULL)) { 1612 int old_sector_size = sector_size; 1613 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1614 "Trying to use READ CAPACITY(16).\n"); 1615 sector_size = read_capacity_16(sdkp, sdp, buffer); 1616 if (sector_size < 0) { 1617 sd_printk(KERN_NOTICE, sdkp, 1618 "Using 0xffffffff as device size\n"); 1619 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1620 sector_size = old_sector_size; 1621 goto got_data; 1622 } 1623 } 1624 } 1625 1626 /* Some devices are known to return the total number of blocks, 1627 * not the highest block number. Some devices have versions 1628 * which do this and others which do not. Some devices we might 1629 * suspect of doing this but we don't know for certain. 1630 * 1631 * If we know the reported capacity is wrong, decrement it. If 1632 * we can only guess, then assume the number of blocks is even 1633 * (usually true but not always) and err on the side of lowering 1634 * the capacity. 1635 */ 1636 if (sdp->fix_capacity || 1637 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 1638 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 1639 "from its reported value: %llu\n", 1640 (unsigned long long) sdkp->capacity); 1641 --sdkp->capacity; 1642 } 1643 1644 got_data: 1645 if (sector_size == 0) { 1646 sector_size = 512; 1647 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1648 "assuming 512.\n"); 1649 } 1650 1651 if (sector_size != 512 && 1652 sector_size != 1024 && 1653 sector_size != 2048 && 1654 sector_size != 4096 && 1655 sector_size != 256) { 1656 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1657 sector_size); 1658 /* 1659 * The user might want to re-format the drive with 1660 * a supported sectorsize. Once this happens, it 1661 * would be relatively trivial to set the thing up. 1662 * For this reason, we leave the thing in the table. 1663 */ 1664 sdkp->capacity = 0; 1665 /* 1666 * set a bogus sector size so the normal read/write 1667 * logic in the block layer will eventually refuse any 1668 * request on this device without tripping over power 1669 * of two sector size assumptions 1670 */ 1671 sector_size = 512; 1672 } 1673 blk_queue_logical_block_size(sdp->request_queue, sector_size); 1674 1675 { 1676 char cap_str_2[10], cap_str_10[10]; 1677 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 1678 1679 string_get_size(sz, STRING_UNITS_2, cap_str_2, 1680 sizeof(cap_str_2)); 1681 string_get_size(sz, STRING_UNITS_10, cap_str_10, 1682 sizeof(cap_str_10)); 1683 1684 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 1685 sd_printk(KERN_NOTICE, sdkp, 1686 "%llu %d-byte logical blocks: (%s/%s)\n", 1687 (unsigned long long)sdkp->capacity, 1688 sector_size, cap_str_10, cap_str_2); 1689 1690 if (sdkp->hw_sector_size != sector_size) 1691 sd_printk(KERN_NOTICE, sdkp, 1692 "%u-byte physical blocks\n", 1693 sdkp->hw_sector_size); 1694 } 1695 } 1696 1697 /* Rescale capacity to 512-byte units */ 1698 if (sector_size == 4096) 1699 sdkp->capacity <<= 3; 1700 else if (sector_size == 2048) 1701 sdkp->capacity <<= 2; 1702 else if (sector_size == 1024) 1703 sdkp->capacity <<= 1; 1704 else if (sector_size == 256) 1705 sdkp->capacity >>= 1; 1706 1707 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size); 1708 sdkp->device->sector_size = sector_size; 1709 } 1710 1711 /* called with buffer of length 512 */ 1712 static inline int 1713 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1714 unsigned char *buffer, int len, struct scsi_mode_data *data, 1715 struct scsi_sense_hdr *sshdr) 1716 { 1717 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1718 SD_TIMEOUT, SD_MAX_RETRIES, data, 1719 sshdr); 1720 } 1721 1722 /* 1723 * read write protect setting, if possible - called only in sd_revalidate_disk() 1724 * called with buffer of length SD_BUF_SIZE 1725 */ 1726 static void 1727 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1728 { 1729 int res; 1730 struct scsi_device *sdp = sdkp->device; 1731 struct scsi_mode_data data; 1732 int old_wp = sdkp->write_prot; 1733 1734 set_disk_ro(sdkp->disk, 0); 1735 if (sdp->skip_ms_page_3f) { 1736 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1737 return; 1738 } 1739 1740 if (sdp->use_192_bytes_for_3f) { 1741 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1742 } else { 1743 /* 1744 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1745 * We have to start carefully: some devices hang if we ask 1746 * for more than is available. 1747 */ 1748 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1749 1750 /* 1751 * Second attempt: ask for page 0 When only page 0 is 1752 * implemented, a request for page 3F may return Sense Key 1753 * 5: Illegal Request, Sense Code 24: Invalid field in 1754 * CDB. 1755 */ 1756 if (!scsi_status_is_good(res)) 1757 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1758 1759 /* 1760 * Third attempt: ask 255 bytes, as we did earlier. 1761 */ 1762 if (!scsi_status_is_good(res)) 1763 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1764 &data, NULL); 1765 } 1766 1767 if (!scsi_status_is_good(res)) { 1768 sd_printk(KERN_WARNING, sdkp, 1769 "Test WP failed, assume Write Enabled\n"); 1770 } else { 1771 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1772 set_disk_ro(sdkp->disk, sdkp->write_prot); 1773 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 1774 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1775 sdkp->write_prot ? "on" : "off"); 1776 sd_printk(KERN_DEBUG, sdkp, 1777 "Mode Sense: %02x %02x %02x %02x\n", 1778 buffer[0], buffer[1], buffer[2], buffer[3]); 1779 } 1780 } 1781 } 1782 1783 /* 1784 * sd_read_cache_type - called only from sd_revalidate_disk() 1785 * called with buffer of length SD_BUF_SIZE 1786 */ 1787 static void 1788 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1789 { 1790 int len = 0, res; 1791 struct scsi_device *sdp = sdkp->device; 1792 1793 int dbd; 1794 int modepage; 1795 struct scsi_mode_data data; 1796 struct scsi_sense_hdr sshdr; 1797 int old_wce = sdkp->WCE; 1798 int old_rcd = sdkp->RCD; 1799 int old_dpofua = sdkp->DPOFUA; 1800 1801 if (sdp->skip_ms_page_8) 1802 goto defaults; 1803 1804 if (sdp->type == TYPE_RBC) { 1805 modepage = 6; 1806 dbd = 8; 1807 } else { 1808 modepage = 8; 1809 dbd = 0; 1810 } 1811 1812 /* cautiously ask */ 1813 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1814 1815 if (!scsi_status_is_good(res)) 1816 goto bad_sense; 1817 1818 if (!data.header_length) { 1819 modepage = 6; 1820 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1821 } 1822 1823 /* that went OK, now ask for the proper length */ 1824 len = data.length; 1825 1826 /* 1827 * We're only interested in the first three bytes, actually. 1828 * But the data cache page is defined for the first 20. 1829 */ 1830 if (len < 3) 1831 goto bad_sense; 1832 if (len > 20) 1833 len = 20; 1834 1835 /* Take headers and block descriptors into account */ 1836 len += data.header_length + data.block_descriptor_length; 1837 if (len > SD_BUF_SIZE) 1838 goto bad_sense; 1839 1840 /* Get the data */ 1841 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1842 1843 if (scsi_status_is_good(res)) { 1844 int offset = data.header_length + data.block_descriptor_length; 1845 1846 if (offset >= SD_BUF_SIZE - 2) { 1847 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1848 goto defaults; 1849 } 1850 1851 if ((buffer[offset] & 0x3f) != modepage) { 1852 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1853 goto defaults; 1854 } 1855 1856 if (modepage == 8) { 1857 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1858 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1859 } else { 1860 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1861 sdkp->RCD = 0; 1862 } 1863 1864 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1865 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1866 sd_printk(KERN_NOTICE, sdkp, 1867 "Uses READ/WRITE(6), disabling FUA\n"); 1868 sdkp->DPOFUA = 0; 1869 } 1870 1871 if (sdkp->first_scan || old_wce != sdkp->WCE || 1872 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 1873 sd_printk(KERN_NOTICE, sdkp, 1874 "Write cache: %s, read cache: %s, %s\n", 1875 sdkp->WCE ? "enabled" : "disabled", 1876 sdkp->RCD ? "disabled" : "enabled", 1877 sdkp->DPOFUA ? "supports DPO and FUA" 1878 : "doesn't support DPO or FUA"); 1879 1880 return; 1881 } 1882 1883 bad_sense: 1884 if (scsi_sense_valid(&sshdr) && 1885 sshdr.sense_key == ILLEGAL_REQUEST && 1886 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1887 /* Invalid field in CDB */ 1888 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1889 else 1890 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1891 1892 defaults: 1893 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1894 sdkp->WCE = 0; 1895 sdkp->RCD = 0; 1896 sdkp->DPOFUA = 0; 1897 } 1898 1899 /* 1900 * The ATO bit indicates whether the DIF application tag is available 1901 * for use by the operating system. 1902 */ 1903 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 1904 { 1905 int res, offset; 1906 struct scsi_device *sdp = sdkp->device; 1907 struct scsi_mode_data data; 1908 struct scsi_sense_hdr sshdr; 1909 1910 if (sdp->type != TYPE_DISK) 1911 return; 1912 1913 if (sdkp->protection_type == 0) 1914 return; 1915 1916 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 1917 SD_MAX_RETRIES, &data, &sshdr); 1918 1919 if (!scsi_status_is_good(res) || !data.header_length || 1920 data.length < 6) { 1921 sd_printk(KERN_WARNING, sdkp, 1922 "getting Control mode page failed, assume no ATO\n"); 1923 1924 if (scsi_sense_valid(&sshdr)) 1925 sd_print_sense_hdr(sdkp, &sshdr); 1926 1927 return; 1928 } 1929 1930 offset = data.header_length + data.block_descriptor_length; 1931 1932 if ((buffer[offset] & 0x3f) != 0x0a) { 1933 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 1934 return; 1935 } 1936 1937 if ((buffer[offset + 5] & 0x80) == 0) 1938 return; 1939 1940 sdkp->ATO = 1; 1941 1942 return; 1943 } 1944 1945 /** 1946 * sd_read_block_limits - Query disk device for preferred I/O sizes. 1947 * @disk: disk to query 1948 */ 1949 static void sd_read_block_limits(struct scsi_disk *sdkp) 1950 { 1951 struct request_queue *q = sdkp->disk->queue; 1952 unsigned int sector_sz = sdkp->device->sector_size; 1953 const int vpd_len = 64; 1954 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 1955 1956 if (!buffer || 1957 /* Block Limits VPD */ 1958 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 1959 goto out; 1960 1961 blk_queue_io_min(sdkp->disk->queue, 1962 get_unaligned_be16(&buffer[6]) * sector_sz); 1963 blk_queue_io_opt(sdkp->disk->queue, 1964 get_unaligned_be32(&buffer[12]) * sector_sz); 1965 1966 /* Thin provisioning enabled and page length indicates TP support */ 1967 if (sdkp->thin_provisioning && buffer[3] == 0x3c) { 1968 unsigned int lba_count, desc_count, granularity; 1969 1970 lba_count = get_unaligned_be32(&buffer[20]); 1971 desc_count = get_unaligned_be32(&buffer[24]); 1972 1973 if (lba_count) { 1974 q->limits.max_discard_sectors = 1975 lba_count * sector_sz >> 9; 1976 1977 if (desc_count) 1978 sdkp->unmap = 1; 1979 } 1980 1981 granularity = get_unaligned_be32(&buffer[28]); 1982 1983 if (granularity) 1984 q->limits.discard_granularity = granularity * sector_sz; 1985 1986 if (buffer[32] & 0x80) 1987 q->limits.discard_alignment = 1988 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 1989 } 1990 1991 out: 1992 kfree(buffer); 1993 } 1994 1995 /** 1996 * sd_read_block_characteristics - Query block dev. characteristics 1997 * @disk: disk to query 1998 */ 1999 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 2000 { 2001 unsigned char *buffer; 2002 u16 rot; 2003 const int vpd_len = 64; 2004 2005 buffer = kmalloc(vpd_len, GFP_KERNEL); 2006 2007 if (!buffer || 2008 /* Block Device Characteristics VPD */ 2009 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2010 goto out; 2011 2012 rot = get_unaligned_be16(&buffer[4]); 2013 2014 if (rot == 1) 2015 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2016 2017 out: 2018 kfree(buffer); 2019 } 2020 2021 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2022 { 2023 /* 2024 * Although VPD inquiries can go to SCSI-2 type devices, 2025 * some USB ones crash on receiving them, and the pages 2026 * we currently ask for are for SPC-3 and beyond 2027 */ 2028 if (sdp->scsi_level > SCSI_SPC_2) 2029 return 1; 2030 return 0; 2031 } 2032 2033 /** 2034 * sd_revalidate_disk - called the first time a new disk is seen, 2035 * performs disk spin up, read_capacity, etc. 2036 * @disk: struct gendisk we care about 2037 **/ 2038 static int sd_revalidate_disk(struct gendisk *disk) 2039 { 2040 struct scsi_disk *sdkp = scsi_disk(disk); 2041 struct scsi_device *sdp = sdkp->device; 2042 unsigned char *buffer; 2043 unsigned ordered; 2044 2045 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2046 "sd_revalidate_disk\n")); 2047 2048 /* 2049 * If the device is offline, don't try and read capacity or any 2050 * of the other niceties. 2051 */ 2052 if (!scsi_device_online(sdp)) 2053 goto out; 2054 2055 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2056 if (!buffer) { 2057 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2058 "allocation failure.\n"); 2059 goto out; 2060 } 2061 2062 sd_spinup_disk(sdkp); 2063 2064 /* 2065 * Without media there is no reason to ask; moreover, some devices 2066 * react badly if we do. 2067 */ 2068 if (sdkp->media_present) { 2069 sd_read_capacity(sdkp, buffer); 2070 2071 if (sd_try_extended_inquiry(sdp)) { 2072 sd_read_block_limits(sdkp); 2073 sd_read_block_characteristics(sdkp); 2074 } 2075 2076 sd_read_write_protect_flag(sdkp, buffer); 2077 sd_read_cache_type(sdkp, buffer); 2078 sd_read_app_tag_own(sdkp, buffer); 2079 } 2080 2081 sdkp->first_scan = 0; 2082 2083 /* 2084 * We now have all cache related info, determine how we deal 2085 * with ordered requests. Note that as the current SCSI 2086 * dispatch function can alter request order, we cannot use 2087 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 2088 */ 2089 if (sdkp->WCE) 2090 ordered = sdkp->DPOFUA 2091 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 2092 else 2093 ordered = QUEUE_ORDERED_DRAIN; 2094 2095 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); 2096 2097 set_capacity(disk, sdkp->capacity); 2098 kfree(buffer); 2099 2100 out: 2101 return 0; 2102 } 2103 2104 /** 2105 * sd_format_disk_name - format disk name 2106 * @prefix: name prefix - ie. "sd" for SCSI disks 2107 * @index: index of the disk to format name for 2108 * @buf: output buffer 2109 * @buflen: length of the output buffer 2110 * 2111 * SCSI disk names starts at sda. The 26th device is sdz and the 2112 * 27th is sdaa. The last one for two lettered suffix is sdzz 2113 * which is followed by sdaaa. 2114 * 2115 * This is basically 26 base counting with one extra 'nil' entry 2116 * at the beginning from the second digit on and can be 2117 * determined using similar method as 26 base conversion with the 2118 * index shifted -1 after each digit is computed. 2119 * 2120 * CONTEXT: 2121 * Don't care. 2122 * 2123 * RETURNS: 2124 * 0 on success, -errno on failure. 2125 */ 2126 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2127 { 2128 const int base = 'z' - 'a' + 1; 2129 char *begin = buf + strlen(prefix); 2130 char *end = buf + buflen; 2131 char *p; 2132 int unit; 2133 2134 p = end - 1; 2135 *p = '\0'; 2136 unit = base; 2137 do { 2138 if (p == begin) 2139 return -EINVAL; 2140 *--p = 'a' + (index % unit); 2141 index = (index / unit) - 1; 2142 } while (index >= 0); 2143 2144 memmove(begin, p, end - p); 2145 memcpy(buf, prefix, strlen(prefix)); 2146 2147 return 0; 2148 } 2149 2150 /* 2151 * The asynchronous part of sd_probe 2152 */ 2153 static void sd_probe_async(void *data, async_cookie_t cookie) 2154 { 2155 struct scsi_disk *sdkp = data; 2156 struct scsi_device *sdp; 2157 struct gendisk *gd; 2158 u32 index; 2159 struct device *dev; 2160 2161 sdp = sdkp->device; 2162 gd = sdkp->disk; 2163 index = sdkp->index; 2164 dev = &sdp->sdev_gendev; 2165 2166 if (index < SD_MAX_DISKS) { 2167 gd->major = sd_major((index & 0xf0) >> 4); 2168 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2169 gd->minors = SD_MINORS; 2170 } 2171 gd->fops = &sd_fops; 2172 gd->private_data = &sdkp->driver; 2173 gd->queue = sdkp->device->request_queue; 2174 2175 /* defaults, until the device tells us otherwise */ 2176 sdp->sector_size = 512; 2177 sdkp->capacity = 0; 2178 sdkp->media_present = 1; 2179 sdkp->write_prot = 0; 2180 sdkp->WCE = 0; 2181 sdkp->RCD = 0; 2182 sdkp->ATO = 0; 2183 sdkp->first_scan = 1; 2184 2185 sd_revalidate_disk(gd); 2186 2187 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2188 2189 gd->driverfs_dev = &sdp->sdev_gendev; 2190 gd->flags = GENHD_FL_EXT_DEVT; 2191 if (sdp->removable) 2192 gd->flags |= GENHD_FL_REMOVABLE; 2193 2194 dev_set_drvdata(dev, sdkp); 2195 add_disk(gd); 2196 sd_dif_config_host(sdkp); 2197 2198 sd_revalidate_disk(gd); 2199 2200 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2201 sdp->removable ? "removable " : ""); 2202 put_device(&sdkp->dev); 2203 } 2204 2205 /** 2206 * sd_probe - called during driver initialization and whenever a 2207 * new scsi device is attached to the system. It is called once 2208 * for each scsi device (not just disks) present. 2209 * @dev: pointer to device object 2210 * 2211 * Returns 0 if successful (or not interested in this scsi device 2212 * (e.g. scanner)); 1 when there is an error. 2213 * 2214 * Note: this function is invoked from the scsi mid-level. 2215 * This function sets up the mapping between a given 2216 * <host,channel,id,lun> (found in sdp) and new device name 2217 * (e.g. /dev/sda). More precisely it is the block device major 2218 * and minor number that is chosen here. 2219 * 2220 * Assume sd_attach is not re-entrant (for time being) 2221 * Also think about sd_attach() and sd_remove() running coincidentally. 2222 **/ 2223 static int sd_probe(struct device *dev) 2224 { 2225 struct scsi_device *sdp = to_scsi_device(dev); 2226 struct scsi_disk *sdkp; 2227 struct gendisk *gd; 2228 u32 index; 2229 int error; 2230 2231 error = -ENODEV; 2232 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2233 goto out; 2234 2235 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2236 "sd_attach\n")); 2237 2238 error = -ENOMEM; 2239 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2240 if (!sdkp) 2241 goto out; 2242 2243 gd = alloc_disk(SD_MINORS); 2244 if (!gd) 2245 goto out_free; 2246 2247 do { 2248 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2249 goto out_put; 2250 2251 spin_lock(&sd_index_lock); 2252 error = ida_get_new(&sd_index_ida, &index); 2253 spin_unlock(&sd_index_lock); 2254 } while (error == -EAGAIN); 2255 2256 if (error) 2257 goto out_put; 2258 2259 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2260 if (error) 2261 goto out_free_index; 2262 2263 sdkp->device = sdp; 2264 sdkp->driver = &sd_template; 2265 sdkp->disk = gd; 2266 sdkp->index = index; 2267 sdkp->openers = 0; 2268 sdkp->previous_state = 1; 2269 2270 if (!sdp->request_queue->rq_timeout) { 2271 if (sdp->type != TYPE_MOD) 2272 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2273 else 2274 blk_queue_rq_timeout(sdp->request_queue, 2275 SD_MOD_TIMEOUT); 2276 } 2277 2278 device_initialize(&sdkp->dev); 2279 sdkp->dev.parent = &sdp->sdev_gendev; 2280 sdkp->dev.class = &sd_disk_class; 2281 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); 2282 2283 if (device_add(&sdkp->dev)) 2284 goto out_free_index; 2285 2286 get_device(&sdp->sdev_gendev); 2287 2288 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2289 async_schedule(sd_probe_async, sdkp); 2290 2291 return 0; 2292 2293 out_free_index: 2294 spin_lock(&sd_index_lock); 2295 ida_remove(&sd_index_ida, index); 2296 spin_unlock(&sd_index_lock); 2297 out_put: 2298 put_disk(gd); 2299 out_free: 2300 kfree(sdkp); 2301 out: 2302 return error; 2303 } 2304 2305 /** 2306 * sd_remove - called whenever a scsi disk (previously recognized by 2307 * sd_probe) is detached from the system. It is called (potentially 2308 * multiple times) during sd module unload. 2309 * @sdp: pointer to mid level scsi device object 2310 * 2311 * Note: this function is invoked from the scsi mid-level. 2312 * This function potentially frees up a device name (e.g. /dev/sdc) 2313 * that could be re-used by a subsequent sd_probe(). 2314 * This function is not called when the built-in sd driver is "exit-ed". 2315 **/ 2316 static int sd_remove(struct device *dev) 2317 { 2318 struct scsi_disk *sdkp; 2319 2320 async_synchronize_full(); 2321 sdkp = dev_get_drvdata(dev); 2322 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 2323 device_del(&sdkp->dev); 2324 del_gendisk(sdkp->disk); 2325 sd_shutdown(dev); 2326 2327 mutex_lock(&sd_ref_mutex); 2328 dev_set_drvdata(dev, NULL); 2329 put_device(&sdkp->dev); 2330 mutex_unlock(&sd_ref_mutex); 2331 2332 return 0; 2333 } 2334 2335 /** 2336 * scsi_disk_release - Called to free the scsi_disk structure 2337 * @dev: pointer to embedded class device 2338 * 2339 * sd_ref_mutex must be held entering this routine. Because it is 2340 * called on last put, you should always use the scsi_disk_get() 2341 * scsi_disk_put() helpers which manipulate the semaphore directly 2342 * and never do a direct put_device. 2343 **/ 2344 static void scsi_disk_release(struct device *dev) 2345 { 2346 struct scsi_disk *sdkp = to_scsi_disk(dev); 2347 struct gendisk *disk = sdkp->disk; 2348 2349 spin_lock(&sd_index_lock); 2350 ida_remove(&sd_index_ida, sdkp->index); 2351 spin_unlock(&sd_index_lock); 2352 2353 disk->private_data = NULL; 2354 put_disk(disk); 2355 put_device(&sdkp->device->sdev_gendev); 2356 2357 kfree(sdkp); 2358 } 2359 2360 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 2361 { 2362 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 2363 struct scsi_sense_hdr sshdr; 2364 struct scsi_device *sdp = sdkp->device; 2365 int res; 2366 2367 if (start) 2368 cmd[4] |= 1; /* START */ 2369 2370 if (sdp->start_stop_pwr_cond) 2371 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 2372 2373 if (!scsi_device_online(sdp)) 2374 return -ENODEV; 2375 2376 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 2377 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2378 if (res) { 2379 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 2380 sd_print_result(sdkp, res); 2381 if (driver_byte(res) & DRIVER_SENSE) 2382 sd_print_sense_hdr(sdkp, &sshdr); 2383 } 2384 2385 return res; 2386 } 2387 2388 /* 2389 * Send a SYNCHRONIZE CACHE instruction down to the device through 2390 * the normal SCSI command structure. Wait for the command to 2391 * complete. 2392 */ 2393 static void sd_shutdown(struct device *dev) 2394 { 2395 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2396 2397 if (!sdkp) 2398 return; /* this can happen */ 2399 2400 if (sdkp->WCE) { 2401 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2402 sd_sync_cache(sdkp); 2403 } 2404 2405 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 2406 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2407 sd_start_stop_device(sdkp, 0); 2408 } 2409 2410 scsi_disk_put(sdkp); 2411 } 2412 2413 static int sd_suspend(struct device *dev, pm_message_t mesg) 2414 { 2415 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2416 int ret = 0; 2417 2418 if (!sdkp) 2419 return 0; /* this can happen */ 2420 2421 if (sdkp->WCE) { 2422 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2423 ret = sd_sync_cache(sdkp); 2424 if (ret) 2425 goto done; 2426 } 2427 2428 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 2429 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2430 ret = sd_start_stop_device(sdkp, 0); 2431 } 2432 2433 done: 2434 scsi_disk_put(sdkp); 2435 return ret; 2436 } 2437 2438 static int sd_resume(struct device *dev) 2439 { 2440 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2441 int ret = 0; 2442 2443 if (!sdkp->device->manage_start_stop) 2444 goto done; 2445 2446 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 2447 ret = sd_start_stop_device(sdkp, 1); 2448 2449 done: 2450 scsi_disk_put(sdkp); 2451 return ret; 2452 } 2453 2454 /** 2455 * init_sd - entry point for this driver (both when built in or when 2456 * a module). 2457 * 2458 * Note: this function registers this driver with the scsi mid-level. 2459 **/ 2460 static int __init init_sd(void) 2461 { 2462 int majors = 0, i, err; 2463 2464 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 2465 2466 for (i = 0; i < SD_MAJORS; i++) 2467 if (register_blkdev(sd_major(i), "sd") == 0) 2468 majors++; 2469 2470 if (!majors) 2471 return -ENODEV; 2472 2473 err = class_register(&sd_disk_class); 2474 if (err) 2475 goto err_out; 2476 2477 err = scsi_register_driver(&sd_template.gendrv); 2478 if (err) 2479 goto err_out_class; 2480 2481 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 2482 0, 0, NULL); 2483 if (!sd_cdb_cache) { 2484 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 2485 goto err_out_class; 2486 } 2487 2488 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 2489 if (!sd_cdb_pool) { 2490 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 2491 goto err_out_cache; 2492 } 2493 2494 return 0; 2495 2496 err_out_cache: 2497 kmem_cache_destroy(sd_cdb_cache); 2498 2499 err_out_class: 2500 class_unregister(&sd_disk_class); 2501 err_out: 2502 for (i = 0; i < SD_MAJORS; i++) 2503 unregister_blkdev(sd_major(i), "sd"); 2504 return err; 2505 } 2506 2507 /** 2508 * exit_sd - exit point for this driver (when it is a module). 2509 * 2510 * Note: this function unregisters this driver from the scsi mid-level. 2511 **/ 2512 static void __exit exit_sd(void) 2513 { 2514 int i; 2515 2516 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 2517 2518 mempool_destroy(sd_cdb_pool); 2519 kmem_cache_destroy(sd_cdb_cache); 2520 2521 scsi_unregister_driver(&sd_template.gendrv); 2522 class_unregister(&sd_disk_class); 2523 2524 for (i = 0; i < SD_MAJORS; i++) 2525 unregister_blkdev(sd_major(i), "sd"); 2526 } 2527 2528 module_init(init_sd); 2529 module_exit(exit_sd); 2530 2531 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 2532 struct scsi_sense_hdr *sshdr) 2533 { 2534 sd_printk(KERN_INFO, sdkp, ""); 2535 scsi_show_sense_hdr(sshdr); 2536 sd_printk(KERN_INFO, sdkp, ""); 2537 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 2538 } 2539 2540 static void sd_print_result(struct scsi_disk *sdkp, int result) 2541 { 2542 sd_printk(KERN_INFO, sdkp, ""); 2543 scsi_show_result(result); 2544 } 2545 2546