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->cmd[0] = SYNCHRONIZE_CACHE; 1044 rq->cmd_len = 10; 1045 } 1046 1047 static void sd_rescan(struct device *dev) 1048 { 1049 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 1050 1051 if (sdkp) { 1052 revalidate_disk(sdkp->disk); 1053 scsi_disk_put(sdkp); 1054 } 1055 } 1056 1057 1058 #ifdef CONFIG_COMPAT 1059 /* 1060 * This gets directly called from VFS. When the ioctl 1061 * is not recognized we go back to the other translation paths. 1062 */ 1063 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 1064 unsigned int cmd, unsigned long arg) 1065 { 1066 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 1067 1068 /* 1069 * If we are in the middle of error recovery, don't let anyone 1070 * else try and use this device. Also, if error recovery fails, it 1071 * may try and take the device offline, in which case all further 1072 * access to the device is prohibited. 1073 */ 1074 if (!scsi_block_when_processing_errors(sdev)) 1075 return -ENODEV; 1076 1077 if (sdev->host->hostt->compat_ioctl) { 1078 int ret; 1079 1080 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 1081 1082 return ret; 1083 } 1084 1085 /* 1086 * Let the static ioctl translation table take care of it. 1087 */ 1088 return -ENOIOCTLCMD; 1089 } 1090 #endif 1091 1092 static const struct block_device_operations sd_fops = { 1093 .owner = THIS_MODULE, 1094 .open = sd_open, 1095 .release = sd_release, 1096 .locked_ioctl = sd_ioctl, 1097 .getgeo = sd_getgeo, 1098 #ifdef CONFIG_COMPAT 1099 .compat_ioctl = sd_compat_ioctl, 1100 #endif 1101 .media_changed = sd_media_changed, 1102 .revalidate_disk = sd_revalidate_disk, 1103 }; 1104 1105 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 1106 { 1107 u64 start_lba = blk_rq_pos(scmd->request); 1108 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 1109 u64 bad_lba; 1110 int info_valid; 1111 1112 if (!blk_fs_request(scmd->request)) 1113 return 0; 1114 1115 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 1116 SCSI_SENSE_BUFFERSIZE, 1117 &bad_lba); 1118 if (!info_valid) 1119 return 0; 1120 1121 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 1122 return 0; 1123 1124 if (scmd->device->sector_size < 512) { 1125 /* only legitimate sector_size here is 256 */ 1126 start_lba <<= 1; 1127 end_lba <<= 1; 1128 } else { 1129 /* be careful ... don't want any overflows */ 1130 u64 factor = scmd->device->sector_size / 512; 1131 do_div(start_lba, factor); 1132 do_div(end_lba, factor); 1133 } 1134 1135 /* The bad lba was reported incorrectly, we have no idea where 1136 * the error is. 1137 */ 1138 if (bad_lba < start_lba || bad_lba >= end_lba) 1139 return 0; 1140 1141 /* This computation should always be done in terms of 1142 * the resolution of the device's medium. 1143 */ 1144 return (bad_lba - start_lba) * scmd->device->sector_size; 1145 } 1146 1147 /** 1148 * sd_done - bottom half handler: called when the lower level 1149 * driver has completed (successfully or otherwise) a scsi command. 1150 * @SCpnt: mid-level's per command structure. 1151 * 1152 * Note: potentially run from within an ISR. Must not block. 1153 **/ 1154 static int sd_done(struct scsi_cmnd *SCpnt) 1155 { 1156 int result = SCpnt->result; 1157 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1158 struct scsi_sense_hdr sshdr; 1159 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); 1160 int sense_valid = 0; 1161 int sense_deferred = 0; 1162 1163 if (result) { 1164 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1165 if (sense_valid) 1166 sense_deferred = scsi_sense_is_deferred(&sshdr); 1167 } 1168 #ifdef CONFIG_SCSI_LOGGING 1169 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1170 if (sense_valid) { 1171 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1172 "sd_done: sb[respc,sk,asc," 1173 "ascq]=%x,%x,%x,%x\n", 1174 sshdr.response_code, 1175 sshdr.sense_key, sshdr.asc, 1176 sshdr.ascq)); 1177 } 1178 #endif 1179 if (driver_byte(result) != DRIVER_SENSE && 1180 (!sense_valid || sense_deferred)) 1181 goto out; 1182 1183 switch (sshdr.sense_key) { 1184 case HARDWARE_ERROR: 1185 case MEDIUM_ERROR: 1186 good_bytes = sd_completed_bytes(SCpnt); 1187 break; 1188 case RECOVERED_ERROR: 1189 good_bytes = scsi_bufflen(SCpnt); 1190 break; 1191 case NO_SENSE: 1192 /* This indicates a false check condition, so ignore it. An 1193 * unknown amount of data was transferred so treat it as an 1194 * error. 1195 */ 1196 scsi_print_sense("sd", SCpnt); 1197 SCpnt->result = 0; 1198 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1199 break; 1200 case ABORTED_COMMAND: /* DIF: Target detected corruption */ 1201 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */ 1202 if (sshdr.asc == 0x10) 1203 good_bytes = sd_completed_bytes(SCpnt); 1204 break; 1205 default: 1206 break; 1207 } 1208 out: 1209 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1210 sd_dif_complete(SCpnt, good_bytes); 1211 1212 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) 1213 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { 1214 1215 /* We have to print a failed command here as the 1216 * extended CDB gets freed before scsi_io_completion() 1217 * is called. 1218 */ 1219 if (result) 1220 scsi_print_command(SCpnt); 1221 1222 mempool_free(SCpnt->cmnd, sd_cdb_pool); 1223 SCpnt->cmnd = NULL; 1224 SCpnt->cmd_len = 0; 1225 } 1226 1227 return good_bytes; 1228 } 1229 1230 static int media_not_present(struct scsi_disk *sdkp, 1231 struct scsi_sense_hdr *sshdr) 1232 { 1233 1234 if (!scsi_sense_valid(sshdr)) 1235 return 0; 1236 /* not invoked for commands that could return deferred errors */ 1237 if (sshdr->sense_key != NOT_READY && 1238 sshdr->sense_key != UNIT_ATTENTION) 1239 return 0; 1240 if (sshdr->asc != 0x3A) /* medium not present */ 1241 return 0; 1242 1243 set_media_not_present(sdkp); 1244 return 1; 1245 } 1246 1247 /* 1248 * spinup disk - called only in sd_revalidate_disk() 1249 */ 1250 static void 1251 sd_spinup_disk(struct scsi_disk *sdkp) 1252 { 1253 unsigned char cmd[10]; 1254 unsigned long spintime_expire = 0; 1255 int retries, spintime; 1256 unsigned int the_result; 1257 struct scsi_sense_hdr sshdr; 1258 int sense_valid = 0; 1259 1260 spintime = 0; 1261 1262 /* Spin up drives, as required. Only do this at boot time */ 1263 /* Spinup needs to be done for module loads too. */ 1264 do { 1265 retries = 0; 1266 1267 do { 1268 cmd[0] = TEST_UNIT_READY; 1269 memset((void *) &cmd[1], 0, 9); 1270 1271 the_result = scsi_execute_req(sdkp->device, cmd, 1272 DMA_NONE, NULL, 0, 1273 &sshdr, SD_TIMEOUT, 1274 SD_MAX_RETRIES, NULL); 1275 1276 /* 1277 * If the drive has indicated to us that it 1278 * doesn't have any media in it, don't bother 1279 * with any more polling. 1280 */ 1281 if (media_not_present(sdkp, &sshdr)) 1282 return; 1283 1284 if (the_result) 1285 sense_valid = scsi_sense_valid(&sshdr); 1286 retries++; 1287 } while (retries < 3 && 1288 (!scsi_status_is_good(the_result) || 1289 ((driver_byte(the_result) & DRIVER_SENSE) && 1290 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1291 1292 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1293 /* no sense, TUR either succeeded or failed 1294 * with a status error */ 1295 if(!spintime && !scsi_status_is_good(the_result)) { 1296 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1297 sd_print_result(sdkp, the_result); 1298 } 1299 break; 1300 } 1301 1302 /* 1303 * The device does not want the automatic start to be issued. 1304 */ 1305 if (sdkp->device->no_start_on_add) 1306 break; 1307 1308 if (sense_valid && sshdr.sense_key == NOT_READY) { 1309 if (sshdr.asc == 4 && sshdr.ascq == 3) 1310 break; /* manual intervention required */ 1311 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1312 break; /* standby */ 1313 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1314 break; /* unavailable */ 1315 /* 1316 * Issue command to spin up drive when not ready 1317 */ 1318 if (!spintime) { 1319 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1320 cmd[0] = START_STOP; 1321 cmd[1] = 1; /* Return immediately */ 1322 memset((void *) &cmd[2], 0, 8); 1323 cmd[4] = 1; /* Start spin cycle */ 1324 if (sdkp->device->start_stop_pwr_cond) 1325 cmd[4] |= 1 << 4; 1326 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1327 NULL, 0, &sshdr, 1328 SD_TIMEOUT, SD_MAX_RETRIES, 1329 NULL); 1330 spintime_expire = jiffies + 100 * HZ; 1331 spintime = 1; 1332 } 1333 /* Wait 1 second for next try */ 1334 msleep(1000); 1335 printk("."); 1336 1337 /* 1338 * Wait for USB flash devices with slow firmware. 1339 * Yes, this sense key/ASC combination shouldn't 1340 * occur here. It's characteristic of these devices. 1341 */ 1342 } else if (sense_valid && 1343 sshdr.sense_key == UNIT_ATTENTION && 1344 sshdr.asc == 0x28) { 1345 if (!spintime) { 1346 spintime_expire = jiffies + 5 * HZ; 1347 spintime = 1; 1348 } 1349 /* Wait 1 second for next try */ 1350 msleep(1000); 1351 } else { 1352 /* we don't understand the sense code, so it's 1353 * probably pointless to loop */ 1354 if(!spintime) { 1355 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1356 sd_print_sense_hdr(sdkp, &sshdr); 1357 } 1358 break; 1359 } 1360 1361 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1362 1363 if (spintime) { 1364 if (scsi_status_is_good(the_result)) 1365 printk("ready\n"); 1366 else 1367 printk("not responding...\n"); 1368 } 1369 } 1370 1371 1372 /* 1373 * Determine whether disk supports Data Integrity Field. 1374 */ 1375 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1376 { 1377 struct scsi_device *sdp = sdkp->device; 1378 u8 type; 1379 1380 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1381 return; 1382 1383 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1384 1385 if (type == sdkp->protection_type || !sdkp->first_scan) 1386 return; 1387 1388 sdkp->protection_type = type; 1389 1390 if (type > SD_DIF_TYPE3_PROTECTION) { 1391 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \ 1392 "protection type %u. Disabling disk!\n", type); 1393 sdkp->capacity = 0; 1394 return; 1395 } 1396 1397 if (scsi_host_dif_capable(sdp->host, type)) 1398 sd_printk(KERN_NOTICE, sdkp, 1399 "Enabling DIF Type %u protection\n", type); 1400 else 1401 sd_printk(KERN_NOTICE, sdkp, 1402 "Disabling DIF Type %u protection\n", type); 1403 } 1404 1405 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1406 struct scsi_sense_hdr *sshdr, int sense_valid, 1407 int the_result) 1408 { 1409 sd_print_result(sdkp, the_result); 1410 if (driver_byte(the_result) & DRIVER_SENSE) 1411 sd_print_sense_hdr(sdkp, sshdr); 1412 else 1413 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1414 1415 /* 1416 * Set dirty bit for removable devices if not ready - 1417 * sometimes drives will not report this properly. 1418 */ 1419 if (sdp->removable && 1420 sense_valid && sshdr->sense_key == NOT_READY) 1421 sdp->changed = 1; 1422 1423 /* 1424 * We used to set media_present to 0 here to indicate no media 1425 * in the drive, but some drives fail read capacity even with 1426 * media present, so we can't do that. 1427 */ 1428 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1429 } 1430 1431 #define RC16_LEN 32 1432 #if RC16_LEN > SD_BUF_SIZE 1433 #error RC16_LEN must not be more than SD_BUF_SIZE 1434 #endif 1435 1436 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1437 unsigned char *buffer) 1438 { 1439 unsigned char cmd[16]; 1440 struct scsi_sense_hdr sshdr; 1441 int sense_valid = 0; 1442 int the_result; 1443 int retries = 3; 1444 unsigned int alignment; 1445 unsigned long long lba; 1446 unsigned sector_size; 1447 1448 do { 1449 memset(cmd, 0, 16); 1450 cmd[0] = SERVICE_ACTION_IN; 1451 cmd[1] = SAI_READ_CAPACITY_16; 1452 cmd[13] = RC16_LEN; 1453 memset(buffer, 0, RC16_LEN); 1454 1455 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1456 buffer, RC16_LEN, &sshdr, 1457 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1458 1459 if (media_not_present(sdkp, &sshdr)) 1460 return -ENODEV; 1461 1462 if (the_result) { 1463 sense_valid = scsi_sense_valid(&sshdr); 1464 if (sense_valid && 1465 sshdr.sense_key == ILLEGAL_REQUEST && 1466 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1467 sshdr.ascq == 0x00) 1468 /* Invalid Command Operation Code or 1469 * Invalid Field in CDB, just retry 1470 * silently with RC10 */ 1471 return -EINVAL; 1472 } 1473 retries--; 1474 1475 } while (the_result && retries); 1476 1477 if (the_result) { 1478 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1479 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1480 return -EINVAL; 1481 } 1482 1483 sector_size = get_unaligned_be32(&buffer[8]); 1484 lba = get_unaligned_be64(&buffer[0]); 1485 1486 sd_read_protection_type(sdkp, buffer); 1487 1488 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1489 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1490 "kernel compiled with support for large block " 1491 "devices.\n"); 1492 sdkp->capacity = 0; 1493 return -EOVERFLOW; 1494 } 1495 1496 /* Logical blocks per physical block exponent */ 1497 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size; 1498 1499 /* Lowest aligned logical block */ 1500 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 1501 blk_queue_alignment_offset(sdp->request_queue, alignment); 1502 if (alignment && sdkp->first_scan) 1503 sd_printk(KERN_NOTICE, sdkp, 1504 "physical block alignment offset: %u\n", alignment); 1505 1506 if (buffer[14] & 0x80) { /* TPE */ 1507 struct request_queue *q = sdp->request_queue; 1508 1509 sdkp->thin_provisioning = 1; 1510 q->limits.discard_granularity = sdkp->hw_sector_size; 1511 q->limits.max_discard_sectors = 0xffffffff; 1512 1513 if (buffer[14] & 0x40) /* TPRZ */ 1514 q->limits.discard_zeroes_data = 1; 1515 1516 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); 1517 } 1518 1519 sdkp->capacity = lba + 1; 1520 return sector_size; 1521 } 1522 1523 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 1524 unsigned char *buffer) 1525 { 1526 unsigned char cmd[16]; 1527 struct scsi_sense_hdr sshdr; 1528 int sense_valid = 0; 1529 int the_result; 1530 int retries = 3; 1531 sector_t lba; 1532 unsigned sector_size; 1533 1534 do { 1535 cmd[0] = READ_CAPACITY; 1536 memset(&cmd[1], 0, 9); 1537 memset(buffer, 0, 8); 1538 1539 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1540 buffer, 8, &sshdr, 1541 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1542 1543 if (media_not_present(sdkp, &sshdr)) 1544 return -ENODEV; 1545 1546 if (the_result) 1547 sense_valid = scsi_sense_valid(&sshdr); 1548 retries--; 1549 1550 } while (the_result && retries); 1551 1552 if (the_result) { 1553 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1554 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1555 return -EINVAL; 1556 } 1557 1558 sector_size = get_unaligned_be32(&buffer[4]); 1559 lba = get_unaligned_be32(&buffer[0]); 1560 1561 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 1562 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1563 "kernel compiled with support for large block " 1564 "devices.\n"); 1565 sdkp->capacity = 0; 1566 return -EOVERFLOW; 1567 } 1568 1569 sdkp->capacity = lba + 1; 1570 sdkp->hw_sector_size = sector_size; 1571 return sector_size; 1572 } 1573 1574 static int sd_try_rc16_first(struct scsi_device *sdp) 1575 { 1576 if (sdp->scsi_level > SCSI_SPC_2) 1577 return 1; 1578 if (scsi_device_protection(sdp)) 1579 return 1; 1580 return 0; 1581 } 1582 1583 /* 1584 * read disk capacity 1585 */ 1586 static void 1587 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1588 { 1589 int sector_size; 1590 struct scsi_device *sdp = sdkp->device; 1591 sector_t old_capacity = sdkp->capacity; 1592 1593 if (sd_try_rc16_first(sdp)) { 1594 sector_size = read_capacity_16(sdkp, sdp, buffer); 1595 if (sector_size == -EOVERFLOW) 1596 goto got_data; 1597 if (sector_size == -ENODEV) 1598 return; 1599 if (sector_size < 0) 1600 sector_size = read_capacity_10(sdkp, sdp, buffer); 1601 if (sector_size < 0) 1602 return; 1603 } else { 1604 sector_size = read_capacity_10(sdkp, sdp, buffer); 1605 if (sector_size == -EOVERFLOW) 1606 goto got_data; 1607 if (sector_size < 0) 1608 return; 1609 if ((sizeof(sdkp->capacity) > 4) && 1610 (sdkp->capacity > 0xffffffffULL)) { 1611 int old_sector_size = sector_size; 1612 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1613 "Trying to use READ CAPACITY(16).\n"); 1614 sector_size = read_capacity_16(sdkp, sdp, buffer); 1615 if (sector_size < 0) { 1616 sd_printk(KERN_NOTICE, sdkp, 1617 "Using 0xffffffff as device size\n"); 1618 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1619 sector_size = old_sector_size; 1620 goto got_data; 1621 } 1622 } 1623 } 1624 1625 /* Some devices are known to return the total number of blocks, 1626 * not the highest block number. Some devices have versions 1627 * which do this and others which do not. Some devices we might 1628 * suspect of doing this but we don't know for certain. 1629 * 1630 * If we know the reported capacity is wrong, decrement it. If 1631 * we can only guess, then assume the number of blocks is even 1632 * (usually true but not always) and err on the side of lowering 1633 * the capacity. 1634 */ 1635 if (sdp->fix_capacity || 1636 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 1637 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 1638 "from its reported value: %llu\n", 1639 (unsigned long long) sdkp->capacity); 1640 --sdkp->capacity; 1641 } 1642 1643 got_data: 1644 if (sector_size == 0) { 1645 sector_size = 512; 1646 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1647 "assuming 512.\n"); 1648 } 1649 1650 if (sector_size != 512 && 1651 sector_size != 1024 && 1652 sector_size != 2048 && 1653 sector_size != 4096 && 1654 sector_size != 256) { 1655 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1656 sector_size); 1657 /* 1658 * The user might want to re-format the drive with 1659 * a supported sectorsize. Once this happens, it 1660 * would be relatively trivial to set the thing up. 1661 * For this reason, we leave the thing in the table. 1662 */ 1663 sdkp->capacity = 0; 1664 /* 1665 * set a bogus sector size so the normal read/write 1666 * logic in the block layer will eventually refuse any 1667 * request on this device without tripping over power 1668 * of two sector size assumptions 1669 */ 1670 sector_size = 512; 1671 } 1672 blk_queue_logical_block_size(sdp->request_queue, sector_size); 1673 1674 { 1675 char cap_str_2[10], cap_str_10[10]; 1676 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 1677 1678 string_get_size(sz, STRING_UNITS_2, cap_str_2, 1679 sizeof(cap_str_2)); 1680 string_get_size(sz, STRING_UNITS_10, cap_str_10, 1681 sizeof(cap_str_10)); 1682 1683 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 1684 sd_printk(KERN_NOTICE, sdkp, 1685 "%llu %d-byte logical blocks: (%s/%s)\n", 1686 (unsigned long long)sdkp->capacity, 1687 sector_size, cap_str_10, cap_str_2); 1688 1689 if (sdkp->hw_sector_size != sector_size) 1690 sd_printk(KERN_NOTICE, sdkp, 1691 "%u-byte physical blocks\n", 1692 sdkp->hw_sector_size); 1693 } 1694 } 1695 1696 /* Rescale capacity to 512-byte units */ 1697 if (sector_size == 4096) 1698 sdkp->capacity <<= 3; 1699 else if (sector_size == 2048) 1700 sdkp->capacity <<= 2; 1701 else if (sector_size == 1024) 1702 sdkp->capacity <<= 1; 1703 else if (sector_size == 256) 1704 sdkp->capacity >>= 1; 1705 1706 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size); 1707 sdkp->device->sector_size = sector_size; 1708 } 1709 1710 /* called with buffer of length 512 */ 1711 static inline int 1712 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1713 unsigned char *buffer, int len, struct scsi_mode_data *data, 1714 struct scsi_sense_hdr *sshdr) 1715 { 1716 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1717 SD_TIMEOUT, SD_MAX_RETRIES, data, 1718 sshdr); 1719 } 1720 1721 /* 1722 * read write protect setting, if possible - called only in sd_revalidate_disk() 1723 * called with buffer of length SD_BUF_SIZE 1724 */ 1725 static void 1726 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1727 { 1728 int res; 1729 struct scsi_device *sdp = sdkp->device; 1730 struct scsi_mode_data data; 1731 int old_wp = sdkp->write_prot; 1732 1733 set_disk_ro(sdkp->disk, 0); 1734 if (sdp->skip_ms_page_3f) { 1735 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1736 return; 1737 } 1738 1739 if (sdp->use_192_bytes_for_3f) { 1740 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1741 } else { 1742 /* 1743 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1744 * We have to start carefully: some devices hang if we ask 1745 * for more than is available. 1746 */ 1747 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1748 1749 /* 1750 * Second attempt: ask for page 0 When only page 0 is 1751 * implemented, a request for page 3F may return Sense Key 1752 * 5: Illegal Request, Sense Code 24: Invalid field in 1753 * CDB. 1754 */ 1755 if (!scsi_status_is_good(res)) 1756 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1757 1758 /* 1759 * Third attempt: ask 255 bytes, as we did earlier. 1760 */ 1761 if (!scsi_status_is_good(res)) 1762 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1763 &data, NULL); 1764 } 1765 1766 if (!scsi_status_is_good(res)) { 1767 sd_printk(KERN_WARNING, sdkp, 1768 "Test WP failed, assume Write Enabled\n"); 1769 } else { 1770 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1771 set_disk_ro(sdkp->disk, sdkp->write_prot); 1772 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 1773 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1774 sdkp->write_prot ? "on" : "off"); 1775 sd_printk(KERN_DEBUG, sdkp, 1776 "Mode Sense: %02x %02x %02x %02x\n", 1777 buffer[0], buffer[1], buffer[2], buffer[3]); 1778 } 1779 } 1780 } 1781 1782 /* 1783 * sd_read_cache_type - called only from sd_revalidate_disk() 1784 * called with buffer of length SD_BUF_SIZE 1785 */ 1786 static void 1787 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1788 { 1789 int len = 0, res; 1790 struct scsi_device *sdp = sdkp->device; 1791 1792 int dbd; 1793 int modepage; 1794 struct scsi_mode_data data; 1795 struct scsi_sense_hdr sshdr; 1796 int old_wce = sdkp->WCE; 1797 int old_rcd = sdkp->RCD; 1798 int old_dpofua = sdkp->DPOFUA; 1799 1800 if (sdp->skip_ms_page_8) 1801 goto defaults; 1802 1803 if (sdp->type == TYPE_RBC) { 1804 modepage = 6; 1805 dbd = 8; 1806 } else { 1807 modepage = 8; 1808 dbd = 0; 1809 } 1810 1811 /* cautiously ask */ 1812 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1813 1814 if (!scsi_status_is_good(res)) 1815 goto bad_sense; 1816 1817 if (!data.header_length) { 1818 modepage = 6; 1819 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1820 } 1821 1822 /* that went OK, now ask for the proper length */ 1823 len = data.length; 1824 1825 /* 1826 * We're only interested in the first three bytes, actually. 1827 * But the data cache page is defined for the first 20. 1828 */ 1829 if (len < 3) 1830 goto bad_sense; 1831 if (len > 20) 1832 len = 20; 1833 1834 /* Take headers and block descriptors into account */ 1835 len += data.header_length + data.block_descriptor_length; 1836 if (len > SD_BUF_SIZE) 1837 goto bad_sense; 1838 1839 /* Get the data */ 1840 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1841 1842 if (scsi_status_is_good(res)) { 1843 int offset = data.header_length + data.block_descriptor_length; 1844 1845 if (offset >= SD_BUF_SIZE - 2) { 1846 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1847 goto defaults; 1848 } 1849 1850 if ((buffer[offset] & 0x3f) != modepage) { 1851 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1852 goto defaults; 1853 } 1854 1855 if (modepage == 8) { 1856 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1857 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1858 } else { 1859 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1860 sdkp->RCD = 0; 1861 } 1862 1863 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1864 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1865 sd_printk(KERN_NOTICE, sdkp, 1866 "Uses READ/WRITE(6), disabling FUA\n"); 1867 sdkp->DPOFUA = 0; 1868 } 1869 1870 if (sdkp->first_scan || old_wce != sdkp->WCE || 1871 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 1872 sd_printk(KERN_NOTICE, sdkp, 1873 "Write cache: %s, read cache: %s, %s\n", 1874 sdkp->WCE ? "enabled" : "disabled", 1875 sdkp->RCD ? "disabled" : "enabled", 1876 sdkp->DPOFUA ? "supports DPO and FUA" 1877 : "doesn't support DPO or FUA"); 1878 1879 return; 1880 } 1881 1882 bad_sense: 1883 if (scsi_sense_valid(&sshdr) && 1884 sshdr.sense_key == ILLEGAL_REQUEST && 1885 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1886 /* Invalid field in CDB */ 1887 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1888 else 1889 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1890 1891 defaults: 1892 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1893 sdkp->WCE = 0; 1894 sdkp->RCD = 0; 1895 sdkp->DPOFUA = 0; 1896 } 1897 1898 /* 1899 * The ATO bit indicates whether the DIF application tag is available 1900 * for use by the operating system. 1901 */ 1902 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 1903 { 1904 int res, offset; 1905 struct scsi_device *sdp = sdkp->device; 1906 struct scsi_mode_data data; 1907 struct scsi_sense_hdr sshdr; 1908 1909 if (sdp->type != TYPE_DISK) 1910 return; 1911 1912 if (sdkp->protection_type == 0) 1913 return; 1914 1915 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 1916 SD_MAX_RETRIES, &data, &sshdr); 1917 1918 if (!scsi_status_is_good(res) || !data.header_length || 1919 data.length < 6) { 1920 sd_printk(KERN_WARNING, sdkp, 1921 "getting Control mode page failed, assume no ATO\n"); 1922 1923 if (scsi_sense_valid(&sshdr)) 1924 sd_print_sense_hdr(sdkp, &sshdr); 1925 1926 return; 1927 } 1928 1929 offset = data.header_length + data.block_descriptor_length; 1930 1931 if ((buffer[offset] & 0x3f) != 0x0a) { 1932 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 1933 return; 1934 } 1935 1936 if ((buffer[offset + 5] & 0x80) == 0) 1937 return; 1938 1939 sdkp->ATO = 1; 1940 1941 return; 1942 } 1943 1944 /** 1945 * sd_read_block_limits - Query disk device for preferred I/O sizes. 1946 * @disk: disk to query 1947 */ 1948 static void sd_read_block_limits(struct scsi_disk *sdkp) 1949 { 1950 struct request_queue *q = sdkp->disk->queue; 1951 unsigned int sector_sz = sdkp->device->sector_size; 1952 const int vpd_len = 64; 1953 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); 1954 1955 if (!buffer || 1956 /* Block Limits VPD */ 1957 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) 1958 goto out; 1959 1960 blk_queue_io_min(sdkp->disk->queue, 1961 get_unaligned_be16(&buffer[6]) * sector_sz); 1962 blk_queue_io_opt(sdkp->disk->queue, 1963 get_unaligned_be32(&buffer[12]) * sector_sz); 1964 1965 /* Thin provisioning enabled and page length indicates TP support */ 1966 if (sdkp->thin_provisioning && buffer[3] == 0x3c) { 1967 unsigned int lba_count, desc_count, granularity; 1968 1969 lba_count = get_unaligned_be32(&buffer[20]); 1970 desc_count = get_unaligned_be32(&buffer[24]); 1971 1972 if (lba_count) { 1973 q->limits.max_discard_sectors = 1974 lba_count * sector_sz >> 9; 1975 1976 if (desc_count) 1977 sdkp->unmap = 1; 1978 } 1979 1980 granularity = get_unaligned_be32(&buffer[28]); 1981 1982 if (granularity) 1983 q->limits.discard_granularity = granularity * sector_sz; 1984 1985 if (buffer[32] & 0x80) 1986 q->limits.discard_alignment = 1987 get_unaligned_be32(&buffer[32]) & ~(1 << 31); 1988 } 1989 1990 out: 1991 kfree(buffer); 1992 } 1993 1994 /** 1995 * sd_read_block_characteristics - Query block dev. characteristics 1996 * @disk: disk to query 1997 */ 1998 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 1999 { 2000 unsigned char *buffer; 2001 u16 rot; 2002 const int vpd_len = 64; 2003 2004 buffer = kmalloc(vpd_len, GFP_KERNEL); 2005 2006 if (!buffer || 2007 /* Block Device Characteristics VPD */ 2008 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) 2009 goto out; 2010 2011 rot = get_unaligned_be16(&buffer[4]); 2012 2013 if (rot == 1) 2014 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 2015 2016 out: 2017 kfree(buffer); 2018 } 2019 2020 static int sd_try_extended_inquiry(struct scsi_device *sdp) 2021 { 2022 /* 2023 * Although VPD inquiries can go to SCSI-2 type devices, 2024 * some USB ones crash on receiving them, and the pages 2025 * we currently ask for are for SPC-3 and beyond 2026 */ 2027 if (sdp->scsi_level > SCSI_SPC_2) 2028 return 1; 2029 return 0; 2030 } 2031 2032 /** 2033 * sd_revalidate_disk - called the first time a new disk is seen, 2034 * performs disk spin up, read_capacity, etc. 2035 * @disk: struct gendisk we care about 2036 **/ 2037 static int sd_revalidate_disk(struct gendisk *disk) 2038 { 2039 struct scsi_disk *sdkp = scsi_disk(disk); 2040 struct scsi_device *sdp = sdkp->device; 2041 unsigned char *buffer; 2042 unsigned ordered; 2043 2044 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 2045 "sd_revalidate_disk\n")); 2046 2047 /* 2048 * If the device is offline, don't try and read capacity or any 2049 * of the other niceties. 2050 */ 2051 if (!scsi_device_online(sdp)) 2052 goto out; 2053 2054 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 2055 if (!buffer) { 2056 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 2057 "allocation failure.\n"); 2058 goto out; 2059 } 2060 2061 sd_spinup_disk(sdkp); 2062 2063 /* 2064 * Without media there is no reason to ask; moreover, some devices 2065 * react badly if we do. 2066 */ 2067 if (sdkp->media_present) { 2068 sd_read_capacity(sdkp, buffer); 2069 2070 if (sd_try_extended_inquiry(sdp)) { 2071 sd_read_block_limits(sdkp); 2072 sd_read_block_characteristics(sdkp); 2073 } 2074 2075 sd_read_write_protect_flag(sdkp, buffer); 2076 sd_read_cache_type(sdkp, buffer); 2077 sd_read_app_tag_own(sdkp, buffer); 2078 } 2079 2080 sdkp->first_scan = 0; 2081 2082 /* 2083 * We now have all cache related info, determine how we deal 2084 * with ordered requests. Note that as the current SCSI 2085 * dispatch function can alter request order, we cannot use 2086 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 2087 */ 2088 if (sdkp->WCE) 2089 ordered = sdkp->DPOFUA 2090 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 2091 else 2092 ordered = QUEUE_ORDERED_DRAIN; 2093 2094 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); 2095 2096 set_capacity(disk, sdkp->capacity); 2097 kfree(buffer); 2098 2099 out: 2100 return 0; 2101 } 2102 2103 /** 2104 * sd_format_disk_name - format disk name 2105 * @prefix: name prefix - ie. "sd" for SCSI disks 2106 * @index: index of the disk to format name for 2107 * @buf: output buffer 2108 * @buflen: length of the output buffer 2109 * 2110 * SCSI disk names starts at sda. The 26th device is sdz and the 2111 * 27th is sdaa. The last one for two lettered suffix is sdzz 2112 * which is followed by sdaaa. 2113 * 2114 * This is basically 26 base counting with one extra 'nil' entry 2115 * at the beginning from the second digit on and can be 2116 * determined using similar method as 26 base conversion with the 2117 * index shifted -1 after each digit is computed. 2118 * 2119 * CONTEXT: 2120 * Don't care. 2121 * 2122 * RETURNS: 2123 * 0 on success, -errno on failure. 2124 */ 2125 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 2126 { 2127 const int base = 'z' - 'a' + 1; 2128 char *begin = buf + strlen(prefix); 2129 char *end = buf + buflen; 2130 char *p; 2131 int unit; 2132 2133 p = end - 1; 2134 *p = '\0'; 2135 unit = base; 2136 do { 2137 if (p == begin) 2138 return -EINVAL; 2139 *--p = 'a' + (index % unit); 2140 index = (index / unit) - 1; 2141 } while (index >= 0); 2142 2143 memmove(begin, p, end - p); 2144 memcpy(buf, prefix, strlen(prefix)); 2145 2146 return 0; 2147 } 2148 2149 /* 2150 * The asynchronous part of sd_probe 2151 */ 2152 static void sd_probe_async(void *data, async_cookie_t cookie) 2153 { 2154 struct scsi_disk *sdkp = data; 2155 struct scsi_device *sdp; 2156 struct gendisk *gd; 2157 u32 index; 2158 struct device *dev; 2159 2160 sdp = sdkp->device; 2161 gd = sdkp->disk; 2162 index = sdkp->index; 2163 dev = &sdp->sdev_gendev; 2164 2165 if (index < SD_MAX_DISKS) { 2166 gd->major = sd_major((index & 0xf0) >> 4); 2167 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 2168 gd->minors = SD_MINORS; 2169 } 2170 gd->fops = &sd_fops; 2171 gd->private_data = &sdkp->driver; 2172 gd->queue = sdkp->device->request_queue; 2173 2174 /* defaults, until the device tells us otherwise */ 2175 sdp->sector_size = 512; 2176 sdkp->capacity = 0; 2177 sdkp->media_present = 1; 2178 sdkp->write_prot = 0; 2179 sdkp->WCE = 0; 2180 sdkp->RCD = 0; 2181 sdkp->ATO = 0; 2182 sdkp->first_scan = 1; 2183 2184 sd_revalidate_disk(gd); 2185 2186 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2187 2188 gd->driverfs_dev = &sdp->sdev_gendev; 2189 gd->flags = GENHD_FL_EXT_DEVT; 2190 if (sdp->removable) 2191 gd->flags |= GENHD_FL_REMOVABLE; 2192 2193 dev_set_drvdata(dev, sdkp); 2194 add_disk(gd); 2195 sd_dif_config_host(sdkp); 2196 2197 sd_revalidate_disk(gd); 2198 2199 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2200 sdp->removable ? "removable " : ""); 2201 put_device(&sdkp->dev); 2202 } 2203 2204 /** 2205 * sd_probe - called during driver initialization and whenever a 2206 * new scsi device is attached to the system. It is called once 2207 * for each scsi device (not just disks) present. 2208 * @dev: pointer to device object 2209 * 2210 * Returns 0 if successful (or not interested in this scsi device 2211 * (e.g. scanner)); 1 when there is an error. 2212 * 2213 * Note: this function is invoked from the scsi mid-level. 2214 * This function sets up the mapping between a given 2215 * <host,channel,id,lun> (found in sdp) and new device name 2216 * (e.g. /dev/sda). More precisely it is the block device major 2217 * and minor number that is chosen here. 2218 * 2219 * Assume sd_attach is not re-entrant (for time being) 2220 * Also think about sd_attach() and sd_remove() running coincidentally. 2221 **/ 2222 static int sd_probe(struct device *dev) 2223 { 2224 struct scsi_device *sdp = to_scsi_device(dev); 2225 struct scsi_disk *sdkp; 2226 struct gendisk *gd; 2227 u32 index; 2228 int error; 2229 2230 error = -ENODEV; 2231 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2232 goto out; 2233 2234 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2235 "sd_attach\n")); 2236 2237 error = -ENOMEM; 2238 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2239 if (!sdkp) 2240 goto out; 2241 2242 gd = alloc_disk(SD_MINORS); 2243 if (!gd) 2244 goto out_free; 2245 2246 do { 2247 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2248 goto out_put; 2249 2250 spin_lock(&sd_index_lock); 2251 error = ida_get_new(&sd_index_ida, &index); 2252 spin_unlock(&sd_index_lock); 2253 } while (error == -EAGAIN); 2254 2255 if (error) 2256 goto out_put; 2257 2258 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2259 if (error) 2260 goto out_free_index; 2261 2262 sdkp->device = sdp; 2263 sdkp->driver = &sd_template; 2264 sdkp->disk = gd; 2265 sdkp->index = index; 2266 sdkp->openers = 0; 2267 sdkp->previous_state = 1; 2268 2269 if (!sdp->request_queue->rq_timeout) { 2270 if (sdp->type != TYPE_MOD) 2271 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2272 else 2273 blk_queue_rq_timeout(sdp->request_queue, 2274 SD_MOD_TIMEOUT); 2275 } 2276 2277 device_initialize(&sdkp->dev); 2278 sdkp->dev.parent = &sdp->sdev_gendev; 2279 sdkp->dev.class = &sd_disk_class; 2280 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); 2281 2282 if (device_add(&sdkp->dev)) 2283 goto out_free_index; 2284 2285 get_device(&sdp->sdev_gendev); 2286 2287 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2288 async_schedule(sd_probe_async, sdkp); 2289 2290 return 0; 2291 2292 out_free_index: 2293 spin_lock(&sd_index_lock); 2294 ida_remove(&sd_index_ida, index); 2295 spin_unlock(&sd_index_lock); 2296 out_put: 2297 put_disk(gd); 2298 out_free: 2299 kfree(sdkp); 2300 out: 2301 return error; 2302 } 2303 2304 /** 2305 * sd_remove - called whenever a scsi disk (previously recognized by 2306 * sd_probe) is detached from the system. It is called (potentially 2307 * multiple times) during sd module unload. 2308 * @sdp: pointer to mid level scsi device object 2309 * 2310 * Note: this function is invoked from the scsi mid-level. 2311 * This function potentially frees up a device name (e.g. /dev/sdc) 2312 * that could be re-used by a subsequent sd_probe(). 2313 * This function is not called when the built-in sd driver is "exit-ed". 2314 **/ 2315 static int sd_remove(struct device *dev) 2316 { 2317 struct scsi_disk *sdkp; 2318 2319 async_synchronize_full(); 2320 sdkp = dev_get_drvdata(dev); 2321 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 2322 device_del(&sdkp->dev); 2323 del_gendisk(sdkp->disk); 2324 sd_shutdown(dev); 2325 2326 mutex_lock(&sd_ref_mutex); 2327 dev_set_drvdata(dev, NULL); 2328 put_device(&sdkp->dev); 2329 mutex_unlock(&sd_ref_mutex); 2330 2331 return 0; 2332 } 2333 2334 /** 2335 * scsi_disk_release - Called to free the scsi_disk structure 2336 * @dev: pointer to embedded class device 2337 * 2338 * sd_ref_mutex must be held entering this routine. Because it is 2339 * called on last put, you should always use the scsi_disk_get() 2340 * scsi_disk_put() helpers which manipulate the semaphore directly 2341 * and never do a direct put_device. 2342 **/ 2343 static void scsi_disk_release(struct device *dev) 2344 { 2345 struct scsi_disk *sdkp = to_scsi_disk(dev); 2346 struct gendisk *disk = sdkp->disk; 2347 2348 spin_lock(&sd_index_lock); 2349 ida_remove(&sd_index_ida, sdkp->index); 2350 spin_unlock(&sd_index_lock); 2351 2352 disk->private_data = NULL; 2353 put_disk(disk); 2354 put_device(&sdkp->device->sdev_gendev); 2355 2356 kfree(sdkp); 2357 } 2358 2359 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 2360 { 2361 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 2362 struct scsi_sense_hdr sshdr; 2363 struct scsi_device *sdp = sdkp->device; 2364 int res; 2365 2366 if (start) 2367 cmd[4] |= 1; /* START */ 2368 2369 if (sdp->start_stop_pwr_cond) 2370 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 2371 2372 if (!scsi_device_online(sdp)) 2373 return -ENODEV; 2374 2375 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 2376 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2377 if (res) { 2378 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 2379 sd_print_result(sdkp, res); 2380 if (driver_byte(res) & DRIVER_SENSE) 2381 sd_print_sense_hdr(sdkp, &sshdr); 2382 } 2383 2384 return res; 2385 } 2386 2387 /* 2388 * Send a SYNCHRONIZE CACHE instruction down to the device through 2389 * the normal SCSI command structure. Wait for the command to 2390 * complete. 2391 */ 2392 static void sd_shutdown(struct device *dev) 2393 { 2394 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2395 2396 if (!sdkp) 2397 return; /* this can happen */ 2398 2399 if (sdkp->WCE) { 2400 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2401 sd_sync_cache(sdkp); 2402 } 2403 2404 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 2405 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2406 sd_start_stop_device(sdkp, 0); 2407 } 2408 2409 scsi_disk_put(sdkp); 2410 } 2411 2412 static int sd_suspend(struct device *dev, pm_message_t mesg) 2413 { 2414 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2415 int ret = 0; 2416 2417 if (!sdkp) 2418 return 0; /* this can happen */ 2419 2420 if (sdkp->WCE) { 2421 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2422 ret = sd_sync_cache(sdkp); 2423 if (ret) 2424 goto done; 2425 } 2426 2427 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 2428 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2429 ret = sd_start_stop_device(sdkp, 0); 2430 } 2431 2432 done: 2433 scsi_disk_put(sdkp); 2434 return ret; 2435 } 2436 2437 static int sd_resume(struct device *dev) 2438 { 2439 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2440 int ret = 0; 2441 2442 if (!sdkp->device->manage_start_stop) 2443 goto done; 2444 2445 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 2446 ret = sd_start_stop_device(sdkp, 1); 2447 2448 done: 2449 scsi_disk_put(sdkp); 2450 return ret; 2451 } 2452 2453 /** 2454 * init_sd - entry point for this driver (both when built in or when 2455 * a module). 2456 * 2457 * Note: this function registers this driver with the scsi mid-level. 2458 **/ 2459 static int __init init_sd(void) 2460 { 2461 int majors = 0, i, err; 2462 2463 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 2464 2465 for (i = 0; i < SD_MAJORS; i++) 2466 if (register_blkdev(sd_major(i), "sd") == 0) 2467 majors++; 2468 2469 if (!majors) 2470 return -ENODEV; 2471 2472 err = class_register(&sd_disk_class); 2473 if (err) 2474 goto err_out; 2475 2476 err = scsi_register_driver(&sd_template.gendrv); 2477 if (err) 2478 goto err_out_class; 2479 2480 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, 2481 0, 0, NULL); 2482 if (!sd_cdb_cache) { 2483 printk(KERN_ERR "sd: can't init extended cdb cache\n"); 2484 goto err_out_class; 2485 } 2486 2487 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); 2488 if (!sd_cdb_pool) { 2489 printk(KERN_ERR "sd: can't init extended cdb pool\n"); 2490 goto err_out_cache; 2491 } 2492 2493 return 0; 2494 2495 err_out_cache: 2496 kmem_cache_destroy(sd_cdb_cache); 2497 2498 err_out_class: 2499 class_unregister(&sd_disk_class); 2500 err_out: 2501 for (i = 0; i < SD_MAJORS; i++) 2502 unregister_blkdev(sd_major(i), "sd"); 2503 return err; 2504 } 2505 2506 /** 2507 * exit_sd - exit point for this driver (when it is a module). 2508 * 2509 * Note: this function unregisters this driver from the scsi mid-level. 2510 **/ 2511 static void __exit exit_sd(void) 2512 { 2513 int i; 2514 2515 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 2516 2517 mempool_destroy(sd_cdb_pool); 2518 kmem_cache_destroy(sd_cdb_cache); 2519 2520 scsi_unregister_driver(&sd_template.gendrv); 2521 class_unregister(&sd_disk_class); 2522 2523 for (i = 0; i < SD_MAJORS; i++) 2524 unregister_blkdev(sd_major(i), "sd"); 2525 } 2526 2527 module_init(init_sd); 2528 module_exit(exit_sd); 2529 2530 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 2531 struct scsi_sense_hdr *sshdr) 2532 { 2533 sd_printk(KERN_INFO, sdkp, ""); 2534 scsi_show_sense_hdr(sshdr); 2535 sd_printk(KERN_INFO, sdkp, ""); 2536 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 2537 } 2538 2539 static void sd_print_result(struct scsi_disk *sdkp, int result) 2540 { 2541 sd_printk(KERN_INFO, sdkp, ""); 2542 scsi_show_result(result); 2543 } 2544 2545