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