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 static const char *sd_cache_types[] = { 120 "write through", "none", "write back", 121 "write back, no read (daft)" 122 }; 123 124 static ssize_t 125 sd_store_cache_type(struct device *dev, struct device_attribute *attr, 126 const char *buf, size_t count) 127 { 128 int i, ct = -1, rcd, wce, sp; 129 struct scsi_disk *sdkp = to_scsi_disk(dev); 130 struct scsi_device *sdp = sdkp->device; 131 char buffer[64]; 132 char *buffer_data; 133 struct scsi_mode_data data; 134 struct scsi_sense_hdr sshdr; 135 int len; 136 137 if (sdp->type != TYPE_DISK) 138 /* no cache control on RBC devices; theoretically they 139 * can do it, but there's probably so many exceptions 140 * it's not worth the risk */ 141 return -EINVAL; 142 143 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 144 const int len = strlen(sd_cache_types[i]); 145 if (strncmp(sd_cache_types[i], buf, len) == 0 && 146 buf[len] == '\n') { 147 ct = i; 148 break; 149 } 150 } 151 if (ct < 0) 152 return -EINVAL; 153 rcd = ct & 0x01 ? 1 : 0; 154 wce = ct & 0x02 ? 1 : 0; 155 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 156 SD_MAX_RETRIES, &data, NULL)) 157 return -EINVAL; 158 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 159 data.block_descriptor_length); 160 buffer_data = buffer + data.header_length + 161 data.block_descriptor_length; 162 buffer_data[2] &= ~0x05; 163 buffer_data[2] |= wce << 2 | rcd; 164 sp = buffer_data[0] & 0x80 ? 1 : 0; 165 166 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 167 SD_MAX_RETRIES, &data, &sshdr)) { 168 if (scsi_sense_valid(&sshdr)) 169 sd_print_sense_hdr(sdkp, &sshdr); 170 return -EINVAL; 171 } 172 revalidate_disk(sdkp->disk); 173 return count; 174 } 175 176 static ssize_t 177 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, 178 const char *buf, size_t count) 179 { 180 struct scsi_disk *sdkp = to_scsi_disk(dev); 181 struct scsi_device *sdp = sdkp->device; 182 183 if (!capable(CAP_SYS_ADMIN)) 184 return -EACCES; 185 186 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 187 188 return count; 189 } 190 191 static ssize_t 192 sd_store_allow_restart(struct device *dev, struct device_attribute *attr, 193 const char *buf, size_t count) 194 { 195 struct scsi_disk *sdkp = to_scsi_disk(dev); 196 struct scsi_device *sdp = sdkp->device; 197 198 if (!capable(CAP_SYS_ADMIN)) 199 return -EACCES; 200 201 if (sdp->type != TYPE_DISK) 202 return -EINVAL; 203 204 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 205 206 return count; 207 } 208 209 static ssize_t 210 sd_show_cache_type(struct device *dev, struct device_attribute *attr, 211 char *buf) 212 { 213 struct scsi_disk *sdkp = to_scsi_disk(dev); 214 int ct = sdkp->RCD + 2*sdkp->WCE; 215 216 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 217 } 218 219 static ssize_t 220 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) 221 { 222 struct scsi_disk *sdkp = to_scsi_disk(dev); 223 224 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 225 } 226 227 static ssize_t 228 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, 229 char *buf) 230 { 231 struct scsi_disk *sdkp = to_scsi_disk(dev); 232 struct scsi_device *sdp = sdkp->device; 233 234 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 235 } 236 237 static ssize_t 238 sd_show_allow_restart(struct device *dev, struct device_attribute *attr, 239 char *buf) 240 { 241 struct scsi_disk *sdkp = to_scsi_disk(dev); 242 243 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 244 } 245 246 static ssize_t 247 sd_show_protection_type(struct device *dev, struct device_attribute *attr, 248 char *buf) 249 { 250 struct scsi_disk *sdkp = to_scsi_disk(dev); 251 252 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 253 } 254 255 static ssize_t 256 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, 257 char *buf) 258 { 259 struct scsi_disk *sdkp = to_scsi_disk(dev); 260 261 return snprintf(buf, 20, "%u\n", sdkp->ATO); 262 } 263 264 static struct device_attribute sd_disk_attrs[] = { 265 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 266 sd_store_cache_type), 267 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 268 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 269 sd_store_allow_restart), 270 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 271 sd_store_manage_start_stop), 272 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), 273 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 274 __ATTR_NULL, 275 }; 276 277 static struct class sd_disk_class = { 278 .name = "scsi_disk", 279 .owner = THIS_MODULE, 280 .dev_release = scsi_disk_release, 281 .dev_attrs = sd_disk_attrs, 282 }; 283 284 static struct scsi_driver sd_template = { 285 .owner = THIS_MODULE, 286 .gendrv = { 287 .name = "sd", 288 .probe = sd_probe, 289 .remove = sd_remove, 290 .suspend = sd_suspend, 291 .resume = sd_resume, 292 .shutdown = sd_shutdown, 293 }, 294 .rescan = sd_rescan, 295 .done = sd_done, 296 }; 297 298 /* 299 * Device no to disk mapping: 300 * 301 * major disc2 disc p1 302 * |............|.............|....|....| <- dev_t 303 * 31 20 19 8 7 4 3 0 304 * 305 * Inside a major, we have 16k disks, however mapped non- 306 * contiguously. The first 16 disks are for major0, the next 307 * ones with major1, ... Disk 256 is for major0 again, disk 272 308 * for major1, ... 309 * As we stay compatible with our numbering scheme, we can reuse 310 * the well-know SCSI majors 8, 65--71, 136--143. 311 */ 312 static int sd_major(int major_idx) 313 { 314 switch (major_idx) { 315 case 0: 316 return SCSI_DISK0_MAJOR; 317 case 1 ... 7: 318 return SCSI_DISK1_MAJOR + major_idx - 1; 319 case 8 ... 15: 320 return SCSI_DISK8_MAJOR + major_idx - 8; 321 default: 322 BUG(); 323 return 0; /* shut up gcc */ 324 } 325 } 326 327 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 328 { 329 struct scsi_disk *sdkp = NULL; 330 331 if (disk->private_data) { 332 sdkp = scsi_disk(disk); 333 if (scsi_device_get(sdkp->device) == 0) 334 get_device(&sdkp->dev); 335 else 336 sdkp = NULL; 337 } 338 return sdkp; 339 } 340 341 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 342 { 343 struct scsi_disk *sdkp; 344 345 mutex_lock(&sd_ref_mutex); 346 sdkp = __scsi_disk_get(disk); 347 mutex_unlock(&sd_ref_mutex); 348 return sdkp; 349 } 350 351 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 352 { 353 struct scsi_disk *sdkp; 354 355 mutex_lock(&sd_ref_mutex); 356 sdkp = dev_get_drvdata(dev); 357 if (sdkp) 358 sdkp = __scsi_disk_get(sdkp->disk); 359 mutex_unlock(&sd_ref_mutex); 360 return sdkp; 361 } 362 363 static void scsi_disk_put(struct scsi_disk *sdkp) 364 { 365 struct scsi_device *sdev = sdkp->device; 366 367 mutex_lock(&sd_ref_mutex); 368 put_device(&sdkp->dev); 369 scsi_device_put(sdev); 370 mutex_unlock(&sd_ref_mutex); 371 } 372 373 /** 374 * sd_init_command - build a scsi (read or write) command from 375 * information in the request structure. 376 * @SCpnt: pointer to mid-level's per scsi command structure that 377 * contains request and into which the scsi command is written 378 * 379 * Returns 1 if successful and 0 if error (or cannot be done now). 380 **/ 381 static int sd_prep_fn(struct request_queue *q, struct request *rq) 382 { 383 struct scsi_cmnd *SCpnt; 384 struct scsi_device *sdp = q->queuedata; 385 struct gendisk *disk = rq->rq_disk; 386 struct scsi_disk *sdkp; 387 sector_t block = blk_rq_pos(rq); 388 sector_t threshold; 389 unsigned int this_count = blk_rq_sectors(rq); 390 int ret, host_dif; 391 392 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 393 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 394 goto out; 395 } else if (rq->cmd_type != REQ_TYPE_FS) { 396 ret = BLKPREP_KILL; 397 goto out; 398 } 399 ret = scsi_setup_fs_cmnd(sdp, rq); 400 if (ret != BLKPREP_OK) 401 goto out; 402 SCpnt = rq->special; 403 sdkp = scsi_disk(disk); 404 405 /* from here on until we're complete, any goto out 406 * is used for a killable error condition */ 407 ret = BLKPREP_KILL; 408 409 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 410 "sd_init_command: block=%llu, " 411 "count=%d\n", 412 (unsigned long long)block, 413 this_count)); 414 415 if (!sdp || !scsi_device_online(sdp) || 416 block + blk_rq_sectors(rq) > get_capacity(disk)) { 417 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 418 "Finishing %u sectors\n", 419 blk_rq_sectors(rq))); 420 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 421 "Retry with 0x%p\n", SCpnt)); 422 goto out; 423 } 424 425 if (sdp->changed) { 426 /* 427 * quietly refuse to do anything to a changed disc until 428 * the changed bit has been reset 429 */ 430 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ 431 goto out; 432 } 433 434 /* 435 * Some SD card readers can't handle multi-sector accesses which touch 436 * the last one or two hardware sectors. Split accesses as needed. 437 */ 438 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 439 (sdp->sector_size / 512); 440 441 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 442 if (block < threshold) { 443 /* Access up to the threshold but not beyond */ 444 this_count = threshold - block; 445 } else { 446 /* Access only a single hardware sector */ 447 this_count = sdp->sector_size / 512; 448 } 449 } 450 451 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 452 (unsigned long long)block)); 453 454 /* 455 * If we have a 1K hardware sectorsize, prevent access to single 456 * 512 byte sectors. In theory we could handle this - in fact 457 * the scsi cdrom driver must be able to handle this because 458 * we typically use 1K blocksizes, and cdroms typically have 459 * 2K hardware sectorsizes. Of course, things are simpler 460 * with the cdrom, since it is read-only. For performance 461 * reasons, the filesystems should be able to handle this 462 * and not force the scsi disk driver to use bounce buffers 463 * for this. 464 */ 465 if (sdp->sector_size == 1024) { 466 if ((block & 1) || (blk_rq_sectors(rq) & 1)) { 467 scmd_printk(KERN_ERR, SCpnt, 468 "Bad block number requested\n"); 469 goto out; 470 } else { 471 block = block >> 1; 472 this_count = this_count >> 1; 473 } 474 } 475 if (sdp->sector_size == 2048) { 476 if ((block & 3) || (blk_rq_sectors(rq) & 3)) { 477 scmd_printk(KERN_ERR, SCpnt, 478 "Bad block number requested\n"); 479 goto out; 480 } else { 481 block = block >> 2; 482 this_count = this_count >> 2; 483 } 484 } 485 if (sdp->sector_size == 4096) { 486 if ((block & 7) || (blk_rq_sectors(rq) & 7)) { 487 scmd_printk(KERN_ERR, SCpnt, 488 "Bad block number requested\n"); 489 goto out; 490 } else { 491 block = block >> 3; 492 this_count = this_count >> 3; 493 } 494 } 495 if (rq_data_dir(rq) == WRITE) { 496 if (!sdp->writeable) { 497 goto out; 498 } 499 SCpnt->cmnd[0] = WRITE_6; 500 SCpnt->sc_data_direction = DMA_TO_DEVICE; 501 502 if (blk_integrity_rq(rq) && 503 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) 504 goto out; 505 506 } else if (rq_data_dir(rq) == READ) { 507 SCpnt->cmnd[0] = READ_6; 508 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 509 } else { 510 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 511 goto out; 512 } 513 514 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 515 "%s %d/%u 512 byte blocks.\n", 516 (rq_data_dir(rq) == WRITE) ? 517 "writing" : "reading", this_count, 518 blk_rq_sectors(rq))); 519 520 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ 521 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 522 if (host_dif) 523 SCpnt->cmnd[1] = 1 << 5; 524 else 525 SCpnt->cmnd[1] = 0; 526 527 if (block > 0xffffffff) { 528 SCpnt->cmnd[0] += READ_16 - READ_6; 529 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; 530 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 531 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 532 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 533 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 534 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 535 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 536 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 537 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 538 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 539 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 540 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 541 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 542 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 543 } else if ((this_count > 0xff) || (block > 0x1fffff) || 544 scsi_device_protection(SCpnt->device) || 545 SCpnt->device->use_10_for_rw) { 546 if (this_count > 0xffff) 547 this_count = 0xffff; 548 549 SCpnt->cmnd[0] += READ_10 - READ_6; 550 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; 551 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 552 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 553 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 554 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 555 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 556 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 557 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 558 } else { 559 if (unlikely(blk_fua_rq(rq))) { 560 /* 561 * This happens only if this drive failed 562 * 10byte rw command with ILLEGAL_REQUEST 563 * during operation and thus turned off 564 * use_10_for_rw. 565 */ 566 scmd_printk(KERN_ERR, SCpnt, 567 "FUA write on READ/WRITE(6) drive\n"); 568 goto out; 569 } 570 571 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 572 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 573 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 574 SCpnt->cmnd[4] = (unsigned char) this_count; 575 SCpnt->cmnd[5] = 0; 576 } 577 SCpnt->sdb.length = this_count * sdp->sector_size; 578 579 /* If DIF or DIX is enabled, tell HBA how to handle request */ 580 if (host_dif || scsi_prot_sg_count(SCpnt)) 581 sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt), 582 sdkp->protection_type); 583 584 /* 585 * We shouldn't disconnect in the middle of a sector, so with a dumb 586 * host adapter, it's safe to assume that we can at least transfer 587 * this many bytes between each connect / disconnect. 588 */ 589 SCpnt->transfersize = sdp->sector_size; 590 SCpnt->underflow = this_count << 9; 591 SCpnt->allowed = SD_MAX_RETRIES; 592 593 /* 594 * This indicates that the command is ready from our end to be 595 * queued. 596 */ 597 ret = BLKPREP_OK; 598 out: 599 return scsi_prep_return(q, rq, ret); 600 } 601 602 /** 603 * sd_open - open a scsi disk device 604 * @inode: only i_rdev member may be used 605 * @filp: only f_mode and f_flags may be used 606 * 607 * Returns 0 if successful. Returns a negated errno value in case 608 * of error. 609 * 610 * Note: This can be called from a user context (e.g. fsck(1) ) 611 * or from within the kernel (e.g. as a result of a mount(1) ). 612 * In the latter case @inode and @filp carry an abridged amount 613 * of information as noted above. 614 **/ 615 static int sd_open(struct block_device *bdev, fmode_t mode) 616 { 617 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 618 struct scsi_device *sdev; 619 int retval; 620 621 if (!sdkp) 622 return -ENXIO; 623 624 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 625 626 sdev = sdkp->device; 627 628 /* 629 * If the device is in error recovery, wait until it is done. 630 * If the device is offline, then disallow any access to it. 631 */ 632 retval = -ENXIO; 633 if (!scsi_block_when_processing_errors(sdev)) 634 goto error_out; 635 636 if (sdev->removable || sdkp->write_prot) 637 check_disk_change(bdev); 638 639 /* 640 * If the drive is empty, just let the open fail. 641 */ 642 retval = -ENOMEDIUM; 643 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 644 goto error_out; 645 646 /* 647 * If the device has the write protect tab set, have the open fail 648 * if the user expects to be able to write to the thing. 649 */ 650 retval = -EROFS; 651 if (sdkp->write_prot && (mode & FMODE_WRITE)) 652 goto error_out; 653 654 /* 655 * It is possible that the disk changing stuff resulted in 656 * the device being taken offline. If this is the case, 657 * report this to the user, and don't pretend that the 658 * open actually succeeded. 659 */ 660 retval = -ENXIO; 661 if (!scsi_device_online(sdev)) 662 goto error_out; 663 664 if (!sdkp->openers++ && sdev->removable) { 665 if (scsi_block_when_processing_errors(sdev)) 666 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 667 } 668 669 return 0; 670 671 error_out: 672 scsi_disk_put(sdkp); 673 return retval; 674 } 675 676 /** 677 * sd_release - invoked when the (last) close(2) is called on this 678 * scsi disk. 679 * @inode: only i_rdev member may be used 680 * @filp: only f_mode and f_flags may be used 681 * 682 * Returns 0. 683 * 684 * Note: may block (uninterruptible) if error recovery is underway 685 * on this disk. 686 **/ 687 static int sd_release(struct gendisk *disk, fmode_t mode) 688 { 689 struct scsi_disk *sdkp = scsi_disk(disk); 690 struct scsi_device *sdev = sdkp->device; 691 692 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 693 694 if (!--sdkp->openers && sdev->removable) { 695 if (scsi_block_when_processing_errors(sdev)) 696 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 697 } 698 699 /* 700 * XXX and what if there are packets in flight and this close() 701 * XXX is followed by a "rmmod sd_mod"? 702 */ 703 scsi_disk_put(sdkp); 704 return 0; 705 } 706 707 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 708 { 709 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 710 struct scsi_device *sdp = sdkp->device; 711 struct Scsi_Host *host = sdp->host; 712 int diskinfo[4]; 713 714 /* default to most commonly used values */ 715 diskinfo[0] = 0x40; /* 1 << 6 */ 716 diskinfo[1] = 0x20; /* 1 << 5 */ 717 diskinfo[2] = sdkp->capacity >> 11; 718 719 /* override with calculated, extended default, or driver values */ 720 if (host->hostt->bios_param) 721 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 722 else 723 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 724 725 geo->heads = diskinfo[0]; 726 geo->sectors = diskinfo[1]; 727 geo->cylinders = diskinfo[2]; 728 return 0; 729 } 730 731 /** 732 * sd_ioctl - process an ioctl 733 * @inode: only i_rdev/i_bdev members may be used 734 * @filp: only f_mode and f_flags may be used 735 * @cmd: ioctl command number 736 * @arg: this is third argument given to ioctl(2) system call. 737 * Often contains a pointer. 738 * 739 * Returns 0 if successful (some ioctls return postive numbers on 740 * success as well). Returns a negated errno value in case of error. 741 * 742 * Note: most ioctls are forward onto the block subsystem or further 743 * down in the scsi subsystem. 744 **/ 745 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 746 unsigned int cmd, unsigned long arg) 747 { 748 struct gendisk *disk = bdev->bd_disk; 749 struct scsi_device *sdp = scsi_disk(disk)->device; 750 void __user *p = (void __user *)arg; 751 int error; 752 753 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 754 disk->disk_name, cmd)); 755 756 /* 757 * If we are in the middle of error recovery, don't let anyone 758 * else try and use this device. Also, if error recovery fails, it 759 * may try and take the device offline, in which case all further 760 * access to the device is prohibited. 761 */ 762 error = scsi_nonblockable_ioctl(sdp, cmd, p, 763 (mode & FMODE_NDELAY) != 0); 764 if (!scsi_block_when_processing_errors(sdp) || !error) 765 return error; 766 767 /* 768 * Send SCSI addressing ioctls directly to mid level, send other 769 * ioctls to block level and then onto mid level if they can't be 770 * resolved. 771 */ 772 switch (cmd) { 773 case SCSI_IOCTL_GET_IDLUN: 774 case SCSI_IOCTL_GET_BUS_NUMBER: 775 return scsi_ioctl(sdp, cmd, p); 776 default: 777 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); 778 if (error != -ENOTTY) 779 return error; 780 } 781 return scsi_ioctl(sdp, cmd, p); 782 } 783 784 static void set_media_not_present(struct scsi_disk *sdkp) 785 { 786 sdkp->media_present = 0; 787 sdkp->capacity = 0; 788 sdkp->device->changed = 1; 789 } 790 791 /** 792 * sd_media_changed - check if our medium changed 793 * @disk: kernel device descriptor 794 * 795 * Returns 0 if not applicable or no change; 1 if change 796 * 797 * Note: this function is invoked from the block subsystem. 798 **/ 799 static int sd_media_changed(struct gendisk *disk) 800 { 801 struct scsi_disk *sdkp = scsi_disk(disk); 802 struct scsi_device *sdp = sdkp->device; 803 struct scsi_sense_hdr *sshdr = NULL; 804 int retval; 805 806 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); 807 808 if (!sdp->removable) 809 return 0; 810 811 /* 812 * If the device is offline, don't send any commands - just pretend as 813 * if the command failed. If the device ever comes back online, we 814 * can deal with it then. It is only because of unrecoverable errors 815 * that we would ever take a device offline in the first place. 816 */ 817 if (!scsi_device_online(sdp)) { 818 set_media_not_present(sdkp); 819 retval = 1; 820 goto out; 821 } 822 823 /* 824 * Using TEST_UNIT_READY enables differentiation between drive with 825 * no cartridge loaded - NOT READY, drive with changed cartridge - 826 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 827 * 828 * Drives that auto spin down. eg iomega jaz 1G, will be started 829 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 830 * sd_revalidate() is called. 831 */ 832 retval = -ENODEV; 833 834 if (scsi_block_when_processing_errors(sdp)) { 835 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 836 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 837 sshdr); 838 } 839 840 /* 841 * Unable to test, unit probably not ready. This usually 842 * means there is no disc in the drive. Mark as changed, 843 * and we will figure it out later once the drive is 844 * available again. 845 */ 846 if (retval || (scsi_sense_valid(sshdr) && 847 /* 0x3a is medium not present */ 848 sshdr->asc == 0x3a)) { 849 set_media_not_present(sdkp); 850 retval = 1; 851 goto out; 852 } 853 854 /* 855 * For removable scsi disk we have to recognise the presence 856 * of a disk in the drive. This is kept in the struct scsi_disk 857 * struct and tested at open ! Daniel Roche (dan@lectra.fr) 858 */ 859 sdkp->media_present = 1; 860 861 retval = sdp->changed; 862 sdp->changed = 0; 863 out: 864 if (retval != sdkp->previous_state) 865 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); 866 sdkp->previous_state = retval; 867 kfree(sshdr); 868 return retval; 869 } 870 871 static int sd_sync_cache(struct scsi_disk *sdkp) 872 { 873 int retries, res; 874 struct scsi_device *sdp = sdkp->device; 875 struct scsi_sense_hdr sshdr; 876 877 if (!scsi_device_online(sdp)) 878 return -ENODEV; 879 880 881 for (retries = 3; retries > 0; --retries) { 882 unsigned char cmd[10] = { 0 }; 883 884 cmd[0] = SYNCHRONIZE_CACHE; 885 /* 886 * Leave the rest of the command zero to indicate 887 * flush everything. 888 */ 889 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 890 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 891 if (res == 0) 892 break; 893 } 894 895 if (res) { 896 sd_print_result(sdkp, res); 897 if (driver_byte(res) & DRIVER_SENSE) 898 sd_print_sense_hdr(sdkp, &sshdr); 899 } 900 901 if (res) 902 return -EIO; 903 return 0; 904 } 905 906 static void sd_prepare_flush(struct request_queue *q, struct request *rq) 907 { 908 rq->cmd_type = REQ_TYPE_BLOCK_PC; 909 rq->timeout = SD_TIMEOUT; 910 rq->cmd[0] = SYNCHRONIZE_CACHE; 911 rq->cmd_len = 10; 912 } 913 914 static void sd_rescan(struct device *dev) 915 { 916 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 917 918 if (sdkp) { 919 revalidate_disk(sdkp->disk); 920 scsi_disk_put(sdkp); 921 } 922 } 923 924 925 #ifdef CONFIG_COMPAT 926 /* 927 * This gets directly called from VFS. When the ioctl 928 * is not recognized we go back to the other translation paths. 929 */ 930 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 931 unsigned int cmd, unsigned long arg) 932 { 933 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 934 935 /* 936 * If we are in the middle of error recovery, don't let anyone 937 * else try and use this device. Also, if error recovery fails, it 938 * may try and take the device offline, in which case all further 939 * access to the device is prohibited. 940 */ 941 if (!scsi_block_when_processing_errors(sdev)) 942 return -ENODEV; 943 944 if (sdev->host->hostt->compat_ioctl) { 945 int ret; 946 947 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 948 949 return ret; 950 } 951 952 /* 953 * Let the static ioctl translation table take care of it. 954 */ 955 return -ENOIOCTLCMD; 956 } 957 #endif 958 959 static const struct block_device_operations sd_fops = { 960 .owner = THIS_MODULE, 961 .open = sd_open, 962 .release = sd_release, 963 .locked_ioctl = sd_ioctl, 964 .getgeo = sd_getgeo, 965 #ifdef CONFIG_COMPAT 966 .compat_ioctl = sd_compat_ioctl, 967 #endif 968 .media_changed = sd_media_changed, 969 .revalidate_disk = sd_revalidate_disk, 970 }; 971 972 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 973 { 974 u64 start_lba = blk_rq_pos(scmd->request); 975 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); 976 u64 bad_lba; 977 int info_valid; 978 979 if (!blk_fs_request(scmd->request)) 980 return 0; 981 982 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 983 SCSI_SENSE_BUFFERSIZE, 984 &bad_lba); 985 if (!info_valid) 986 return 0; 987 988 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 989 return 0; 990 991 if (scmd->device->sector_size < 512) { 992 /* only legitimate sector_size here is 256 */ 993 start_lba <<= 1; 994 end_lba <<= 1; 995 } else { 996 /* be careful ... don't want any overflows */ 997 u64 factor = scmd->device->sector_size / 512; 998 do_div(start_lba, factor); 999 do_div(end_lba, factor); 1000 } 1001 1002 /* The bad lba was reported incorrectly, we have no idea where 1003 * the error is. 1004 */ 1005 if (bad_lba < start_lba || bad_lba >= end_lba) 1006 return 0; 1007 1008 /* This computation should always be done in terms of 1009 * the resolution of the device's medium. 1010 */ 1011 return (bad_lba - start_lba) * scmd->device->sector_size; 1012 } 1013 1014 /** 1015 * sd_done - bottom half handler: called when the lower level 1016 * driver has completed (successfully or otherwise) a scsi command. 1017 * @SCpnt: mid-level's per command structure. 1018 * 1019 * Note: potentially run from within an ISR. Must not block. 1020 **/ 1021 static int sd_done(struct scsi_cmnd *SCpnt) 1022 { 1023 int result = SCpnt->result; 1024 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1025 struct scsi_sense_hdr sshdr; 1026 int sense_valid = 0; 1027 int sense_deferred = 0; 1028 1029 if (result) { 1030 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1031 if (sense_valid) 1032 sense_deferred = scsi_sense_is_deferred(&sshdr); 1033 } 1034 #ifdef CONFIG_SCSI_LOGGING 1035 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1036 if (sense_valid) { 1037 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1038 "sd_done: sb[respc,sk,asc," 1039 "ascq]=%x,%x,%x,%x\n", 1040 sshdr.response_code, 1041 sshdr.sense_key, sshdr.asc, 1042 sshdr.ascq)); 1043 } 1044 #endif 1045 if (driver_byte(result) != DRIVER_SENSE && 1046 (!sense_valid || sense_deferred)) 1047 goto out; 1048 1049 switch (sshdr.sense_key) { 1050 case HARDWARE_ERROR: 1051 case MEDIUM_ERROR: 1052 good_bytes = sd_completed_bytes(SCpnt); 1053 break; 1054 case RECOVERED_ERROR: 1055 good_bytes = scsi_bufflen(SCpnt); 1056 break; 1057 case NO_SENSE: 1058 /* This indicates a false check condition, so ignore it. An 1059 * unknown amount of data was transferred so treat it as an 1060 * error. 1061 */ 1062 scsi_print_sense("sd", SCpnt); 1063 SCpnt->result = 0; 1064 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1065 break; 1066 case ABORTED_COMMAND: 1067 if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */ 1068 scsi_print_result(SCpnt); 1069 scsi_print_sense("sd", SCpnt); 1070 good_bytes = sd_completed_bytes(SCpnt); 1071 } 1072 break; 1073 case ILLEGAL_REQUEST: 1074 if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */ 1075 scsi_print_result(SCpnt); 1076 scsi_print_sense("sd", SCpnt); 1077 good_bytes = sd_completed_bytes(SCpnt); 1078 } 1079 break; 1080 default: 1081 break; 1082 } 1083 out: 1084 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1085 sd_dif_complete(SCpnt, good_bytes); 1086 1087 return good_bytes; 1088 } 1089 1090 static int media_not_present(struct scsi_disk *sdkp, 1091 struct scsi_sense_hdr *sshdr) 1092 { 1093 1094 if (!scsi_sense_valid(sshdr)) 1095 return 0; 1096 /* not invoked for commands that could return deferred errors */ 1097 if (sshdr->sense_key != NOT_READY && 1098 sshdr->sense_key != UNIT_ATTENTION) 1099 return 0; 1100 if (sshdr->asc != 0x3A) /* medium not present */ 1101 return 0; 1102 1103 set_media_not_present(sdkp); 1104 return 1; 1105 } 1106 1107 /* 1108 * spinup disk - called only in sd_revalidate_disk() 1109 */ 1110 static void 1111 sd_spinup_disk(struct scsi_disk *sdkp) 1112 { 1113 unsigned char cmd[10]; 1114 unsigned long spintime_expire = 0; 1115 int retries, spintime; 1116 unsigned int the_result; 1117 struct scsi_sense_hdr sshdr; 1118 int sense_valid = 0; 1119 1120 spintime = 0; 1121 1122 /* Spin up drives, as required. Only do this at boot time */ 1123 /* Spinup needs to be done for module loads too. */ 1124 do { 1125 retries = 0; 1126 1127 do { 1128 cmd[0] = TEST_UNIT_READY; 1129 memset((void *) &cmd[1], 0, 9); 1130 1131 the_result = scsi_execute_req(sdkp->device, cmd, 1132 DMA_NONE, NULL, 0, 1133 &sshdr, SD_TIMEOUT, 1134 SD_MAX_RETRIES, NULL); 1135 1136 /* 1137 * If the drive has indicated to us that it 1138 * doesn't have any media in it, don't bother 1139 * with any more polling. 1140 */ 1141 if (media_not_present(sdkp, &sshdr)) 1142 return; 1143 1144 if (the_result) 1145 sense_valid = scsi_sense_valid(&sshdr); 1146 retries++; 1147 } while (retries < 3 && 1148 (!scsi_status_is_good(the_result) || 1149 ((driver_byte(the_result) & DRIVER_SENSE) && 1150 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1151 1152 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1153 /* no sense, TUR either succeeded or failed 1154 * with a status error */ 1155 if(!spintime && !scsi_status_is_good(the_result)) { 1156 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1157 sd_print_result(sdkp, the_result); 1158 } 1159 break; 1160 } 1161 1162 /* 1163 * The device does not want the automatic start to be issued. 1164 */ 1165 if (sdkp->device->no_start_on_add) 1166 break; 1167 1168 if (sense_valid && sshdr.sense_key == NOT_READY) { 1169 if (sshdr.asc == 4 && sshdr.ascq == 3) 1170 break; /* manual intervention required */ 1171 if (sshdr.asc == 4 && sshdr.ascq == 0xb) 1172 break; /* standby */ 1173 if (sshdr.asc == 4 && sshdr.ascq == 0xc) 1174 break; /* unavailable */ 1175 /* 1176 * Issue command to spin up drive when not ready 1177 */ 1178 if (!spintime) { 1179 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1180 cmd[0] = START_STOP; 1181 cmd[1] = 1; /* Return immediately */ 1182 memset((void *) &cmd[2], 0, 8); 1183 cmd[4] = 1; /* Start spin cycle */ 1184 if (sdkp->device->start_stop_pwr_cond) 1185 cmd[4] |= 1 << 4; 1186 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1187 NULL, 0, &sshdr, 1188 SD_TIMEOUT, SD_MAX_RETRIES, 1189 NULL); 1190 spintime_expire = jiffies + 100 * HZ; 1191 spintime = 1; 1192 } 1193 /* Wait 1 second for next try */ 1194 msleep(1000); 1195 printk("."); 1196 1197 /* 1198 * Wait for USB flash devices with slow firmware. 1199 * Yes, this sense key/ASC combination shouldn't 1200 * occur here. It's characteristic of these devices. 1201 */ 1202 } else if (sense_valid && 1203 sshdr.sense_key == UNIT_ATTENTION && 1204 sshdr.asc == 0x28) { 1205 if (!spintime) { 1206 spintime_expire = jiffies + 5 * HZ; 1207 spintime = 1; 1208 } 1209 /* Wait 1 second for next try */ 1210 msleep(1000); 1211 } else { 1212 /* we don't understand the sense code, so it's 1213 * probably pointless to loop */ 1214 if(!spintime) { 1215 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1216 sd_print_sense_hdr(sdkp, &sshdr); 1217 } 1218 break; 1219 } 1220 1221 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1222 1223 if (spintime) { 1224 if (scsi_status_is_good(the_result)) 1225 printk("ready\n"); 1226 else 1227 printk("not responding...\n"); 1228 } 1229 } 1230 1231 1232 /* 1233 * Determine whether disk supports Data Integrity Field. 1234 */ 1235 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1236 { 1237 struct scsi_device *sdp = sdkp->device; 1238 u8 type; 1239 1240 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1241 type = 0; 1242 else 1243 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1244 1245 sdkp->protection_type = type; 1246 1247 switch (type) { 1248 case SD_DIF_TYPE0_PROTECTION: 1249 case SD_DIF_TYPE1_PROTECTION: 1250 case SD_DIF_TYPE3_PROTECTION: 1251 break; 1252 1253 case SD_DIF_TYPE2_PROTECTION: 1254 sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \ 1255 "protection which is currently unsupported. " \ 1256 "Disabling disk!\n"); 1257 goto disable; 1258 1259 default: 1260 sd_printk(KERN_ERR, sdkp, "formatted with unknown " \ 1261 "protection type %d. Disabling disk!\n", type); 1262 goto disable; 1263 } 1264 1265 return; 1266 1267 disable: 1268 sdkp->capacity = 0; 1269 } 1270 1271 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, 1272 struct scsi_sense_hdr *sshdr, int sense_valid, 1273 int the_result) 1274 { 1275 sd_print_result(sdkp, the_result); 1276 if (driver_byte(the_result) & DRIVER_SENSE) 1277 sd_print_sense_hdr(sdkp, sshdr); 1278 else 1279 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1280 1281 /* 1282 * Set dirty bit for removable devices if not ready - 1283 * sometimes drives will not report this properly. 1284 */ 1285 if (sdp->removable && 1286 sense_valid && sshdr->sense_key == NOT_READY) 1287 sdp->changed = 1; 1288 1289 /* 1290 * We used to set media_present to 0 here to indicate no media 1291 * in the drive, but some drives fail read capacity even with 1292 * media present, so we can't do that. 1293 */ 1294 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1295 } 1296 1297 #define RC16_LEN 32 1298 #if RC16_LEN > SD_BUF_SIZE 1299 #error RC16_LEN must not be more than SD_BUF_SIZE 1300 #endif 1301 1302 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, 1303 unsigned char *buffer) 1304 { 1305 unsigned char cmd[16]; 1306 struct scsi_sense_hdr sshdr; 1307 int sense_valid = 0; 1308 int the_result; 1309 int retries = 3; 1310 unsigned int alignment; 1311 unsigned long long lba; 1312 unsigned sector_size; 1313 1314 do { 1315 memset(cmd, 0, 16); 1316 cmd[0] = SERVICE_ACTION_IN; 1317 cmd[1] = SAI_READ_CAPACITY_16; 1318 cmd[13] = RC16_LEN; 1319 memset(buffer, 0, RC16_LEN); 1320 1321 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1322 buffer, RC16_LEN, &sshdr, 1323 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1324 1325 if (media_not_present(sdkp, &sshdr)) 1326 return -ENODEV; 1327 1328 if (the_result) { 1329 sense_valid = scsi_sense_valid(&sshdr); 1330 if (sense_valid && 1331 sshdr.sense_key == ILLEGAL_REQUEST && 1332 (sshdr.asc == 0x20 || sshdr.asc == 0x24) && 1333 sshdr.ascq == 0x00) 1334 /* Invalid Command Operation Code or 1335 * Invalid Field in CDB, just retry 1336 * silently with RC10 */ 1337 return -EINVAL; 1338 } 1339 retries--; 1340 1341 } while (the_result && retries); 1342 1343 if (the_result) { 1344 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1345 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1346 return -EINVAL; 1347 } 1348 1349 sector_size = get_unaligned_be32(&buffer[8]); 1350 lba = get_unaligned_be64(&buffer[0]); 1351 1352 sd_read_protection_type(sdkp, buffer); 1353 1354 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { 1355 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1356 "kernel compiled with support for large block " 1357 "devices.\n"); 1358 sdkp->capacity = 0; 1359 return -EOVERFLOW; 1360 } 1361 1362 /* Logical blocks per physical block exponent */ 1363 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size; 1364 1365 /* Lowest aligned logical block */ 1366 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; 1367 blk_queue_alignment_offset(sdp->request_queue, alignment); 1368 if (alignment && sdkp->first_scan) 1369 sd_printk(KERN_NOTICE, sdkp, 1370 "physical block alignment offset: %u\n", alignment); 1371 1372 sdkp->capacity = lba + 1; 1373 return sector_size; 1374 } 1375 1376 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, 1377 unsigned char *buffer) 1378 { 1379 unsigned char cmd[16]; 1380 struct scsi_sense_hdr sshdr; 1381 int sense_valid = 0; 1382 int the_result; 1383 int retries = 3; 1384 sector_t lba; 1385 unsigned sector_size; 1386 1387 do { 1388 cmd[0] = READ_CAPACITY; 1389 memset(&cmd[1], 0, 9); 1390 memset(buffer, 0, 8); 1391 1392 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1393 buffer, 8, &sshdr, 1394 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1395 1396 if (media_not_present(sdkp, &sshdr)) 1397 return -ENODEV; 1398 1399 if (the_result) 1400 sense_valid = scsi_sense_valid(&sshdr); 1401 retries--; 1402 1403 } while (the_result && retries); 1404 1405 if (the_result) { 1406 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1407 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); 1408 return -EINVAL; 1409 } 1410 1411 sector_size = get_unaligned_be32(&buffer[4]); 1412 lba = get_unaligned_be32(&buffer[0]); 1413 1414 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { 1415 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " 1416 "kernel compiled with support for large block " 1417 "devices.\n"); 1418 sdkp->capacity = 0; 1419 return -EOVERFLOW; 1420 } 1421 1422 sdkp->capacity = lba + 1; 1423 sdkp->hw_sector_size = sector_size; 1424 return sector_size; 1425 } 1426 1427 static int sd_try_rc16_first(struct scsi_device *sdp) 1428 { 1429 if (sdp->scsi_level > SCSI_SPC_2) 1430 return 1; 1431 if (scsi_device_protection(sdp)) 1432 return 1; 1433 return 0; 1434 } 1435 1436 /* 1437 * read disk capacity 1438 */ 1439 static void 1440 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1441 { 1442 int sector_size; 1443 struct scsi_device *sdp = sdkp->device; 1444 sector_t old_capacity = sdkp->capacity; 1445 1446 if (sd_try_rc16_first(sdp)) { 1447 sector_size = read_capacity_16(sdkp, sdp, buffer); 1448 if (sector_size == -EOVERFLOW) 1449 goto got_data; 1450 if (sector_size == -ENODEV) 1451 return; 1452 if (sector_size < 0) 1453 sector_size = read_capacity_10(sdkp, sdp, buffer); 1454 if (sector_size < 0) 1455 return; 1456 } else { 1457 sector_size = read_capacity_10(sdkp, sdp, buffer); 1458 if (sector_size == -EOVERFLOW) 1459 goto got_data; 1460 if (sector_size < 0) 1461 return; 1462 if ((sizeof(sdkp->capacity) > 4) && 1463 (sdkp->capacity > 0xffffffffULL)) { 1464 int old_sector_size = sector_size; 1465 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1466 "Trying to use READ CAPACITY(16).\n"); 1467 sector_size = read_capacity_16(sdkp, sdp, buffer); 1468 if (sector_size < 0) { 1469 sd_printk(KERN_NOTICE, sdkp, 1470 "Using 0xffffffff as device size\n"); 1471 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1472 sector_size = old_sector_size; 1473 goto got_data; 1474 } 1475 } 1476 } 1477 1478 /* Some devices are known to return the total number of blocks, 1479 * not the highest block number. Some devices have versions 1480 * which do this and others which do not. Some devices we might 1481 * suspect of doing this but we don't know for certain. 1482 * 1483 * If we know the reported capacity is wrong, decrement it. If 1484 * we can only guess, then assume the number of blocks is even 1485 * (usually true but not always) and err on the side of lowering 1486 * the capacity. 1487 */ 1488 if (sdp->fix_capacity || 1489 (sdp->guess_capacity && (sdkp->capacity & 0x01))) { 1490 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " 1491 "from its reported value: %llu\n", 1492 (unsigned long long) sdkp->capacity); 1493 --sdkp->capacity; 1494 } 1495 1496 got_data: 1497 if (sector_size == 0) { 1498 sector_size = 512; 1499 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1500 "assuming 512.\n"); 1501 } 1502 1503 if (sector_size != 512 && 1504 sector_size != 1024 && 1505 sector_size != 2048 && 1506 sector_size != 4096 && 1507 sector_size != 256) { 1508 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1509 sector_size); 1510 /* 1511 * The user might want to re-format the drive with 1512 * a supported sectorsize. Once this happens, it 1513 * would be relatively trivial to set the thing up. 1514 * For this reason, we leave the thing in the table. 1515 */ 1516 sdkp->capacity = 0; 1517 /* 1518 * set a bogus sector size so the normal read/write 1519 * logic in the block layer will eventually refuse any 1520 * request on this device without tripping over power 1521 * of two sector size assumptions 1522 */ 1523 sector_size = 512; 1524 } 1525 blk_queue_logical_block_size(sdp->request_queue, sector_size); 1526 1527 { 1528 char cap_str_2[10], cap_str_10[10]; 1529 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 1530 1531 string_get_size(sz, STRING_UNITS_2, cap_str_2, 1532 sizeof(cap_str_2)); 1533 string_get_size(sz, STRING_UNITS_10, cap_str_10, 1534 sizeof(cap_str_10)); 1535 1536 if (sdkp->first_scan || old_capacity != sdkp->capacity) { 1537 sd_printk(KERN_NOTICE, sdkp, 1538 "%llu %d-byte logical blocks: (%s/%s)\n", 1539 (unsigned long long)sdkp->capacity, 1540 sector_size, cap_str_10, cap_str_2); 1541 1542 if (sdkp->hw_sector_size != sector_size) 1543 sd_printk(KERN_NOTICE, sdkp, 1544 "%u-byte physical blocks\n", 1545 sdkp->hw_sector_size); 1546 } 1547 } 1548 1549 /* Rescale capacity to 512-byte units */ 1550 if (sector_size == 4096) 1551 sdkp->capacity <<= 3; 1552 else if (sector_size == 2048) 1553 sdkp->capacity <<= 2; 1554 else if (sector_size == 1024) 1555 sdkp->capacity <<= 1; 1556 else if (sector_size == 256) 1557 sdkp->capacity >>= 1; 1558 1559 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size); 1560 sdkp->device->sector_size = sector_size; 1561 } 1562 1563 /* called with buffer of length 512 */ 1564 static inline int 1565 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1566 unsigned char *buffer, int len, struct scsi_mode_data *data, 1567 struct scsi_sense_hdr *sshdr) 1568 { 1569 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1570 SD_TIMEOUT, SD_MAX_RETRIES, data, 1571 sshdr); 1572 } 1573 1574 /* 1575 * read write protect setting, if possible - called only in sd_revalidate_disk() 1576 * called with buffer of length SD_BUF_SIZE 1577 */ 1578 static void 1579 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1580 { 1581 int res; 1582 struct scsi_device *sdp = sdkp->device; 1583 struct scsi_mode_data data; 1584 int old_wp = sdkp->write_prot; 1585 1586 set_disk_ro(sdkp->disk, 0); 1587 if (sdp->skip_ms_page_3f) { 1588 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1589 return; 1590 } 1591 1592 if (sdp->use_192_bytes_for_3f) { 1593 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1594 } else { 1595 /* 1596 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1597 * We have to start carefully: some devices hang if we ask 1598 * for more than is available. 1599 */ 1600 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1601 1602 /* 1603 * Second attempt: ask for page 0 When only page 0 is 1604 * implemented, a request for page 3F may return Sense Key 1605 * 5: Illegal Request, Sense Code 24: Invalid field in 1606 * CDB. 1607 */ 1608 if (!scsi_status_is_good(res)) 1609 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1610 1611 /* 1612 * Third attempt: ask 255 bytes, as we did earlier. 1613 */ 1614 if (!scsi_status_is_good(res)) 1615 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1616 &data, NULL); 1617 } 1618 1619 if (!scsi_status_is_good(res)) { 1620 sd_printk(KERN_WARNING, sdkp, 1621 "Test WP failed, assume Write Enabled\n"); 1622 } else { 1623 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1624 set_disk_ro(sdkp->disk, sdkp->write_prot); 1625 if (sdkp->first_scan || old_wp != sdkp->write_prot) { 1626 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1627 sdkp->write_prot ? "on" : "off"); 1628 sd_printk(KERN_DEBUG, sdkp, 1629 "Mode Sense: %02x %02x %02x %02x\n", 1630 buffer[0], buffer[1], buffer[2], buffer[3]); 1631 } 1632 } 1633 } 1634 1635 /* 1636 * sd_read_cache_type - called only from sd_revalidate_disk() 1637 * called with buffer of length SD_BUF_SIZE 1638 */ 1639 static void 1640 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1641 { 1642 int len = 0, res; 1643 struct scsi_device *sdp = sdkp->device; 1644 1645 int dbd; 1646 int modepage; 1647 struct scsi_mode_data data; 1648 struct scsi_sense_hdr sshdr; 1649 int old_wce = sdkp->WCE; 1650 int old_rcd = sdkp->RCD; 1651 int old_dpofua = sdkp->DPOFUA; 1652 1653 if (sdp->skip_ms_page_8) 1654 goto defaults; 1655 1656 if (sdp->type == TYPE_RBC) { 1657 modepage = 6; 1658 dbd = 8; 1659 } else { 1660 modepage = 8; 1661 dbd = 0; 1662 } 1663 1664 /* cautiously ask */ 1665 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1666 1667 if (!scsi_status_is_good(res)) 1668 goto bad_sense; 1669 1670 if (!data.header_length) { 1671 modepage = 6; 1672 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1673 } 1674 1675 /* that went OK, now ask for the proper length */ 1676 len = data.length; 1677 1678 /* 1679 * We're only interested in the first three bytes, actually. 1680 * But the data cache page is defined for the first 20. 1681 */ 1682 if (len < 3) 1683 goto bad_sense; 1684 if (len > 20) 1685 len = 20; 1686 1687 /* Take headers and block descriptors into account */ 1688 len += data.header_length + data.block_descriptor_length; 1689 if (len > SD_BUF_SIZE) 1690 goto bad_sense; 1691 1692 /* Get the data */ 1693 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1694 1695 if (scsi_status_is_good(res)) { 1696 int offset = data.header_length + data.block_descriptor_length; 1697 1698 if (offset >= SD_BUF_SIZE - 2) { 1699 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1700 goto defaults; 1701 } 1702 1703 if ((buffer[offset] & 0x3f) != modepage) { 1704 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1705 goto defaults; 1706 } 1707 1708 if (modepage == 8) { 1709 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1710 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1711 } else { 1712 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1713 sdkp->RCD = 0; 1714 } 1715 1716 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1717 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1718 sd_printk(KERN_NOTICE, sdkp, 1719 "Uses READ/WRITE(6), disabling FUA\n"); 1720 sdkp->DPOFUA = 0; 1721 } 1722 1723 if (sdkp->first_scan || old_wce != sdkp->WCE || 1724 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) 1725 sd_printk(KERN_NOTICE, sdkp, 1726 "Write cache: %s, read cache: %s, %s\n", 1727 sdkp->WCE ? "enabled" : "disabled", 1728 sdkp->RCD ? "disabled" : "enabled", 1729 sdkp->DPOFUA ? "supports DPO and FUA" 1730 : "doesn't support DPO or FUA"); 1731 1732 return; 1733 } 1734 1735 bad_sense: 1736 if (scsi_sense_valid(&sshdr) && 1737 sshdr.sense_key == ILLEGAL_REQUEST && 1738 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1739 /* Invalid field in CDB */ 1740 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1741 else 1742 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1743 1744 defaults: 1745 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1746 sdkp->WCE = 0; 1747 sdkp->RCD = 0; 1748 sdkp->DPOFUA = 0; 1749 } 1750 1751 /* 1752 * The ATO bit indicates whether the DIF application tag is available 1753 * for use by the operating system. 1754 */ 1755 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 1756 { 1757 int res, offset; 1758 struct scsi_device *sdp = sdkp->device; 1759 struct scsi_mode_data data; 1760 struct scsi_sense_hdr sshdr; 1761 1762 if (sdp->type != TYPE_DISK) 1763 return; 1764 1765 if (sdkp->protection_type == 0) 1766 return; 1767 1768 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 1769 SD_MAX_RETRIES, &data, &sshdr); 1770 1771 if (!scsi_status_is_good(res) || !data.header_length || 1772 data.length < 6) { 1773 sd_printk(KERN_WARNING, sdkp, 1774 "getting Control mode page failed, assume no ATO\n"); 1775 1776 if (scsi_sense_valid(&sshdr)) 1777 sd_print_sense_hdr(sdkp, &sshdr); 1778 1779 return; 1780 } 1781 1782 offset = data.header_length + data.block_descriptor_length; 1783 1784 if ((buffer[offset] & 0x3f) != 0x0a) { 1785 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 1786 return; 1787 } 1788 1789 if ((buffer[offset + 5] & 0x80) == 0) 1790 return; 1791 1792 sdkp->ATO = 1; 1793 1794 return; 1795 } 1796 1797 /** 1798 * sd_read_block_limits - Query disk device for preferred I/O sizes. 1799 * @disk: disk to query 1800 */ 1801 static void sd_read_block_limits(struct scsi_disk *sdkp) 1802 { 1803 unsigned int sector_sz = sdkp->device->sector_size; 1804 char *buffer; 1805 1806 /* Block Limits VPD */ 1807 buffer = scsi_get_vpd_page(sdkp->device, 0xb0); 1808 1809 if (buffer == NULL) 1810 return; 1811 1812 blk_queue_io_min(sdkp->disk->queue, 1813 get_unaligned_be16(&buffer[6]) * sector_sz); 1814 blk_queue_io_opt(sdkp->disk->queue, 1815 get_unaligned_be32(&buffer[12]) * sector_sz); 1816 1817 kfree(buffer); 1818 } 1819 1820 /** 1821 * sd_read_block_characteristics - Query block dev. characteristics 1822 * @disk: disk to query 1823 */ 1824 static void sd_read_block_characteristics(struct scsi_disk *sdkp) 1825 { 1826 char *buffer; 1827 u16 rot; 1828 1829 /* Block Device Characteristics VPD */ 1830 buffer = scsi_get_vpd_page(sdkp->device, 0xb1); 1831 1832 if (buffer == NULL) 1833 return; 1834 1835 rot = get_unaligned_be16(&buffer[4]); 1836 1837 if (rot == 1) 1838 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); 1839 1840 kfree(buffer); 1841 } 1842 1843 static int sd_try_extended_inquiry(struct scsi_device *sdp) 1844 { 1845 /* 1846 * Although VPD inquiries can go to SCSI-2 type devices, 1847 * some USB ones crash on receiving them, and the pages 1848 * we currently ask for are for SPC-3 and beyond 1849 */ 1850 if (sdp->scsi_level > SCSI_SPC_2) 1851 return 1; 1852 return 0; 1853 } 1854 1855 /** 1856 * sd_revalidate_disk - called the first time a new disk is seen, 1857 * performs disk spin up, read_capacity, etc. 1858 * @disk: struct gendisk we care about 1859 **/ 1860 static int sd_revalidate_disk(struct gendisk *disk) 1861 { 1862 struct scsi_disk *sdkp = scsi_disk(disk); 1863 struct scsi_device *sdp = sdkp->device; 1864 unsigned char *buffer; 1865 unsigned ordered; 1866 1867 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 1868 "sd_revalidate_disk\n")); 1869 1870 /* 1871 * If the device is offline, don't try and read capacity or any 1872 * of the other niceties. 1873 */ 1874 if (!scsi_device_online(sdp)) 1875 goto out; 1876 1877 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 1878 if (!buffer) { 1879 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 1880 "allocation failure.\n"); 1881 goto out; 1882 } 1883 1884 sd_spinup_disk(sdkp); 1885 1886 /* 1887 * Without media there is no reason to ask; moreover, some devices 1888 * react badly if we do. 1889 */ 1890 if (sdkp->media_present) { 1891 sd_read_capacity(sdkp, buffer); 1892 1893 if (sd_try_extended_inquiry(sdp)) { 1894 sd_read_block_limits(sdkp); 1895 sd_read_block_characteristics(sdkp); 1896 } 1897 1898 sd_read_write_protect_flag(sdkp, buffer); 1899 sd_read_cache_type(sdkp, buffer); 1900 sd_read_app_tag_own(sdkp, buffer); 1901 } 1902 1903 sdkp->first_scan = 0; 1904 1905 /* 1906 * We now have all cache related info, determine how we deal 1907 * with ordered requests. Note that as the current SCSI 1908 * dispatch function can alter request order, we cannot use 1909 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 1910 */ 1911 if (sdkp->WCE) 1912 ordered = sdkp->DPOFUA 1913 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 1914 else 1915 ordered = QUEUE_ORDERED_DRAIN; 1916 1917 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); 1918 1919 set_capacity(disk, sdkp->capacity); 1920 kfree(buffer); 1921 1922 out: 1923 return 0; 1924 } 1925 1926 /** 1927 * sd_format_disk_name - format disk name 1928 * @prefix: name prefix - ie. "sd" for SCSI disks 1929 * @index: index of the disk to format name for 1930 * @buf: output buffer 1931 * @buflen: length of the output buffer 1932 * 1933 * SCSI disk names starts at sda. The 26th device is sdz and the 1934 * 27th is sdaa. The last one for two lettered suffix is sdzz 1935 * which is followed by sdaaa. 1936 * 1937 * This is basically 26 base counting with one extra 'nil' entry 1938 * at the beggining from the second digit on and can be 1939 * determined using similar method as 26 base conversion with the 1940 * index shifted -1 after each digit is computed. 1941 * 1942 * CONTEXT: 1943 * Don't care. 1944 * 1945 * RETURNS: 1946 * 0 on success, -errno on failure. 1947 */ 1948 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 1949 { 1950 const int base = 'z' - 'a' + 1; 1951 char *begin = buf + strlen(prefix); 1952 char *end = buf + buflen; 1953 char *p; 1954 int unit; 1955 1956 p = end - 1; 1957 *p = '\0'; 1958 unit = base; 1959 do { 1960 if (p == begin) 1961 return -EINVAL; 1962 *--p = 'a' + (index % unit); 1963 index = (index / unit) - 1; 1964 } while (index >= 0); 1965 1966 memmove(begin, p, end - p); 1967 memcpy(buf, prefix, strlen(prefix)); 1968 1969 return 0; 1970 } 1971 1972 /* 1973 * The asynchronous part of sd_probe 1974 */ 1975 static void sd_probe_async(void *data, async_cookie_t cookie) 1976 { 1977 struct scsi_disk *sdkp = data; 1978 struct scsi_device *sdp; 1979 struct gendisk *gd; 1980 u32 index; 1981 struct device *dev; 1982 1983 sdp = sdkp->device; 1984 gd = sdkp->disk; 1985 index = sdkp->index; 1986 dev = &sdp->sdev_gendev; 1987 1988 if (index < SD_MAX_DISKS) { 1989 gd->major = sd_major((index & 0xf0) >> 4); 1990 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 1991 gd->minors = SD_MINORS; 1992 } 1993 gd->fops = &sd_fops; 1994 gd->private_data = &sdkp->driver; 1995 gd->queue = sdkp->device->request_queue; 1996 1997 /* defaults, until the device tells us otherwise */ 1998 sdp->sector_size = 512; 1999 sdkp->capacity = 0; 2000 sdkp->media_present = 1; 2001 sdkp->write_prot = 0; 2002 sdkp->WCE = 0; 2003 sdkp->RCD = 0; 2004 sdkp->ATO = 0; 2005 sdkp->first_scan = 1; 2006 2007 sd_revalidate_disk(gd); 2008 2009 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 2010 2011 gd->driverfs_dev = &sdp->sdev_gendev; 2012 gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS; 2013 if (sdp->removable) 2014 gd->flags |= GENHD_FL_REMOVABLE; 2015 2016 dev_set_drvdata(dev, sdkp); 2017 add_disk(gd); 2018 sd_dif_config_host(sdkp); 2019 2020 sd_revalidate_disk(gd); 2021 2022 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 2023 sdp->removable ? "removable " : ""); 2024 put_device(&sdkp->dev); 2025 } 2026 2027 /** 2028 * sd_probe - called during driver initialization and whenever a 2029 * new scsi device is attached to the system. It is called once 2030 * for each scsi device (not just disks) present. 2031 * @dev: pointer to device object 2032 * 2033 * Returns 0 if successful (or not interested in this scsi device 2034 * (e.g. scanner)); 1 when there is an error. 2035 * 2036 * Note: this function is invoked from the scsi mid-level. 2037 * This function sets up the mapping between a given 2038 * <host,channel,id,lun> (found in sdp) and new device name 2039 * (e.g. /dev/sda). More precisely it is the block device major 2040 * and minor number that is chosen here. 2041 * 2042 * Assume sd_attach is not re-entrant (for time being) 2043 * Also think about sd_attach() and sd_remove() running coincidentally. 2044 **/ 2045 static int sd_probe(struct device *dev) 2046 { 2047 struct scsi_device *sdp = to_scsi_device(dev); 2048 struct scsi_disk *sdkp; 2049 struct gendisk *gd; 2050 u32 index; 2051 int error; 2052 2053 error = -ENODEV; 2054 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 2055 goto out; 2056 2057 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 2058 "sd_attach\n")); 2059 2060 error = -ENOMEM; 2061 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 2062 if (!sdkp) 2063 goto out; 2064 2065 gd = alloc_disk(SD_MINORS); 2066 if (!gd) 2067 goto out_free; 2068 2069 do { 2070 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 2071 goto out_put; 2072 2073 spin_lock(&sd_index_lock); 2074 error = ida_get_new(&sd_index_ida, &index); 2075 spin_unlock(&sd_index_lock); 2076 } while (error == -EAGAIN); 2077 2078 if (error) 2079 goto out_put; 2080 2081 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 2082 if (error) 2083 goto out_free_index; 2084 2085 sdkp->device = sdp; 2086 sdkp->driver = &sd_template; 2087 sdkp->disk = gd; 2088 sdkp->index = index; 2089 sdkp->openers = 0; 2090 sdkp->previous_state = 1; 2091 2092 if (!sdp->request_queue->rq_timeout) { 2093 if (sdp->type != TYPE_MOD) 2094 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 2095 else 2096 blk_queue_rq_timeout(sdp->request_queue, 2097 SD_MOD_TIMEOUT); 2098 } 2099 2100 device_initialize(&sdkp->dev); 2101 sdkp->dev.parent = &sdp->sdev_gendev; 2102 sdkp->dev.class = &sd_disk_class; 2103 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); 2104 2105 if (device_add(&sdkp->dev)) 2106 goto out_free_index; 2107 2108 get_device(&sdp->sdev_gendev); 2109 2110 get_device(&sdkp->dev); /* prevent release before async_schedule */ 2111 async_schedule(sd_probe_async, sdkp); 2112 2113 return 0; 2114 2115 out_free_index: 2116 spin_lock(&sd_index_lock); 2117 ida_remove(&sd_index_ida, index); 2118 spin_unlock(&sd_index_lock); 2119 out_put: 2120 put_disk(gd); 2121 out_free: 2122 kfree(sdkp); 2123 out: 2124 return error; 2125 } 2126 2127 /** 2128 * sd_remove - called whenever a scsi disk (previously recognized by 2129 * sd_probe) is detached from the system. It is called (potentially 2130 * multiple times) during sd module unload. 2131 * @sdp: pointer to mid level scsi device object 2132 * 2133 * Note: this function is invoked from the scsi mid-level. 2134 * This function potentially frees up a device name (e.g. /dev/sdc) 2135 * that could be re-used by a subsequent sd_probe(). 2136 * This function is not called when the built-in sd driver is "exit-ed". 2137 **/ 2138 static int sd_remove(struct device *dev) 2139 { 2140 struct scsi_disk *sdkp; 2141 2142 async_synchronize_full(); 2143 sdkp = dev_get_drvdata(dev); 2144 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); 2145 device_del(&sdkp->dev); 2146 del_gendisk(sdkp->disk); 2147 sd_shutdown(dev); 2148 2149 mutex_lock(&sd_ref_mutex); 2150 dev_set_drvdata(dev, NULL); 2151 put_device(&sdkp->dev); 2152 mutex_unlock(&sd_ref_mutex); 2153 2154 return 0; 2155 } 2156 2157 /** 2158 * scsi_disk_release - Called to free the scsi_disk structure 2159 * @dev: pointer to embedded class device 2160 * 2161 * sd_ref_mutex must be held entering this routine. Because it is 2162 * called on last put, you should always use the scsi_disk_get() 2163 * scsi_disk_put() helpers which manipulate the semaphore directly 2164 * and never do a direct put_device. 2165 **/ 2166 static void scsi_disk_release(struct device *dev) 2167 { 2168 struct scsi_disk *sdkp = to_scsi_disk(dev); 2169 struct gendisk *disk = sdkp->disk; 2170 2171 spin_lock(&sd_index_lock); 2172 ida_remove(&sd_index_ida, sdkp->index); 2173 spin_unlock(&sd_index_lock); 2174 2175 disk->private_data = NULL; 2176 put_disk(disk); 2177 put_device(&sdkp->device->sdev_gendev); 2178 2179 kfree(sdkp); 2180 } 2181 2182 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 2183 { 2184 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 2185 struct scsi_sense_hdr sshdr; 2186 struct scsi_device *sdp = sdkp->device; 2187 int res; 2188 2189 if (start) 2190 cmd[4] |= 1; /* START */ 2191 2192 if (sdp->start_stop_pwr_cond) 2193 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 2194 2195 if (!scsi_device_online(sdp)) 2196 return -ENODEV; 2197 2198 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 2199 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2200 if (res) { 2201 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 2202 sd_print_result(sdkp, res); 2203 if (driver_byte(res) & DRIVER_SENSE) 2204 sd_print_sense_hdr(sdkp, &sshdr); 2205 } 2206 2207 return res; 2208 } 2209 2210 /* 2211 * Send a SYNCHRONIZE CACHE instruction down to the device through 2212 * the normal SCSI command structure. Wait for the command to 2213 * complete. 2214 */ 2215 static void sd_shutdown(struct device *dev) 2216 { 2217 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2218 2219 if (!sdkp) 2220 return; /* this can happen */ 2221 2222 if (sdkp->WCE) { 2223 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2224 sd_sync_cache(sdkp); 2225 } 2226 2227 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 2228 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2229 sd_start_stop_device(sdkp, 0); 2230 } 2231 2232 scsi_disk_put(sdkp); 2233 } 2234 2235 static int sd_suspend(struct device *dev, pm_message_t mesg) 2236 { 2237 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2238 int ret = 0; 2239 2240 if (!sdkp) 2241 return 0; /* this can happen */ 2242 2243 if (sdkp->WCE) { 2244 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2245 ret = sd_sync_cache(sdkp); 2246 if (ret) 2247 goto done; 2248 } 2249 2250 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 2251 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2252 ret = sd_start_stop_device(sdkp, 0); 2253 } 2254 2255 done: 2256 scsi_disk_put(sdkp); 2257 return ret; 2258 } 2259 2260 static int sd_resume(struct device *dev) 2261 { 2262 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2263 int ret = 0; 2264 2265 if (!sdkp->device->manage_start_stop) 2266 goto done; 2267 2268 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 2269 ret = sd_start_stop_device(sdkp, 1); 2270 2271 done: 2272 scsi_disk_put(sdkp); 2273 return ret; 2274 } 2275 2276 /** 2277 * init_sd - entry point for this driver (both when built in or when 2278 * a module). 2279 * 2280 * Note: this function registers this driver with the scsi mid-level. 2281 **/ 2282 static int __init init_sd(void) 2283 { 2284 int majors = 0, i, err; 2285 2286 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 2287 2288 for (i = 0; i < SD_MAJORS; i++) 2289 if (register_blkdev(sd_major(i), "sd") == 0) 2290 majors++; 2291 2292 if (!majors) 2293 return -ENODEV; 2294 2295 err = class_register(&sd_disk_class); 2296 if (err) 2297 goto err_out; 2298 2299 err = scsi_register_driver(&sd_template.gendrv); 2300 if (err) 2301 goto err_out_class; 2302 2303 return 0; 2304 2305 err_out_class: 2306 class_unregister(&sd_disk_class); 2307 err_out: 2308 for (i = 0; i < SD_MAJORS; i++) 2309 unregister_blkdev(sd_major(i), "sd"); 2310 return err; 2311 } 2312 2313 /** 2314 * exit_sd - exit point for this driver (when it is a module). 2315 * 2316 * Note: this function unregisters this driver from the scsi mid-level. 2317 **/ 2318 static void __exit exit_sd(void) 2319 { 2320 int i; 2321 2322 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 2323 2324 scsi_unregister_driver(&sd_template.gendrv); 2325 class_unregister(&sd_disk_class); 2326 2327 for (i = 0; i < SD_MAJORS; i++) 2328 unregister_blkdev(sd_major(i), "sd"); 2329 } 2330 2331 module_init(init_sd); 2332 module_exit(exit_sd); 2333 2334 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 2335 struct scsi_sense_hdr *sshdr) 2336 { 2337 sd_printk(KERN_INFO, sdkp, ""); 2338 scsi_show_sense_hdr(sshdr); 2339 sd_printk(KERN_INFO, sdkp, ""); 2340 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 2341 } 2342 2343 static void sd_print_result(struct scsi_disk *sdkp, int result) 2344 { 2345 sd_printk(KERN_INFO, sdkp, ""); 2346 scsi_show_result(result); 2347 } 2348 2349