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 54 #include <scsi/scsi.h> 55 #include <scsi/scsi_cmnd.h> 56 #include <scsi/scsi_dbg.h> 57 #include <scsi/scsi_device.h> 58 #include <scsi/scsi_driver.h> 59 #include <scsi/scsi_eh.h> 60 #include <scsi/scsi_host.h> 61 #include <scsi/scsi_ioctl.h> 62 #include <scsi/scsicam.h> 63 64 #include "sd.h" 65 #include "scsi_logging.h" 66 67 MODULE_AUTHOR("Eric Youngdale"); 68 MODULE_DESCRIPTION("SCSI disk (sd) driver"); 69 MODULE_LICENSE("GPL"); 70 71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); 72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); 73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); 74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); 75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); 76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); 77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); 78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); 79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); 80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); 81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); 82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); 83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); 84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); 85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); 86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); 87 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 88 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); 89 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); 90 91 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) 92 #define SD_MINORS 16 93 #else 94 #define SD_MINORS 0 95 #endif 96 97 static int sd_revalidate_disk(struct gendisk *); 98 static int sd_probe(struct device *); 99 static int sd_remove(struct device *); 100 static void sd_shutdown(struct device *); 101 static int sd_suspend(struct device *, pm_message_t state); 102 static int sd_resume(struct device *); 103 static void sd_rescan(struct device *); 104 static int sd_done(struct scsi_cmnd *); 105 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); 106 static void scsi_disk_release(struct device *cdev); 107 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); 108 static void sd_print_result(struct scsi_disk *, int); 109 110 static DEFINE_IDA(sd_index_ida); 111 112 /* This semaphore is used to mediate the 0->1 reference get in the 113 * face of object destruction (i.e. we can't allow a get on an 114 * object after last put) */ 115 static DEFINE_MUTEX(sd_ref_mutex); 116 117 static const char *sd_cache_types[] = { 118 "write through", "none", "write back", 119 "write back, no read (daft)" 120 }; 121 122 static ssize_t 123 sd_store_cache_type(struct device *dev, struct device_attribute *attr, 124 const char *buf, size_t count) 125 { 126 int i, ct = -1, rcd, wce, sp; 127 struct scsi_disk *sdkp = to_scsi_disk(dev); 128 struct scsi_device *sdp = sdkp->device; 129 char buffer[64]; 130 char *buffer_data; 131 struct scsi_mode_data data; 132 struct scsi_sense_hdr sshdr; 133 int len; 134 135 if (sdp->type != TYPE_DISK) 136 /* no cache control on RBC devices; theoretically they 137 * can do it, but there's probably so many exceptions 138 * it's not worth the risk */ 139 return -EINVAL; 140 141 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { 142 const int len = strlen(sd_cache_types[i]); 143 if (strncmp(sd_cache_types[i], buf, len) == 0 && 144 buf[len] == '\n') { 145 ct = i; 146 break; 147 } 148 } 149 if (ct < 0) 150 return -EINVAL; 151 rcd = ct & 0x01 ? 1 : 0; 152 wce = ct & 0x02 ? 1 : 0; 153 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, 154 SD_MAX_RETRIES, &data, NULL)) 155 return -EINVAL; 156 len = min_t(size_t, sizeof(buffer), data.length - data.header_length - 157 data.block_descriptor_length); 158 buffer_data = buffer + data.header_length + 159 data.block_descriptor_length; 160 buffer_data[2] &= ~0x05; 161 buffer_data[2] |= wce << 2 | rcd; 162 sp = buffer_data[0] & 0x80 ? 1 : 0; 163 164 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, 165 SD_MAX_RETRIES, &data, &sshdr)) { 166 if (scsi_sense_valid(&sshdr)) 167 sd_print_sense_hdr(sdkp, &sshdr); 168 return -EINVAL; 169 } 170 revalidate_disk(sdkp->disk); 171 return count; 172 } 173 174 static ssize_t 175 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, 176 const char *buf, size_t count) 177 { 178 struct scsi_disk *sdkp = to_scsi_disk(dev); 179 struct scsi_device *sdp = sdkp->device; 180 181 if (!capable(CAP_SYS_ADMIN)) 182 return -EACCES; 183 184 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); 185 186 return count; 187 } 188 189 static ssize_t 190 sd_store_allow_restart(struct device *dev, struct device_attribute *attr, 191 const char *buf, size_t count) 192 { 193 struct scsi_disk *sdkp = to_scsi_disk(dev); 194 struct scsi_device *sdp = sdkp->device; 195 196 if (!capable(CAP_SYS_ADMIN)) 197 return -EACCES; 198 199 if (sdp->type != TYPE_DISK) 200 return -EINVAL; 201 202 sdp->allow_restart = simple_strtoul(buf, NULL, 10); 203 204 return count; 205 } 206 207 static ssize_t 208 sd_show_cache_type(struct device *dev, struct device_attribute *attr, 209 char *buf) 210 { 211 struct scsi_disk *sdkp = to_scsi_disk(dev); 212 int ct = sdkp->RCD + 2*sdkp->WCE; 213 214 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); 215 } 216 217 static ssize_t 218 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) 219 { 220 struct scsi_disk *sdkp = to_scsi_disk(dev); 221 222 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); 223 } 224 225 static ssize_t 226 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, 227 char *buf) 228 { 229 struct scsi_disk *sdkp = to_scsi_disk(dev); 230 struct scsi_device *sdp = sdkp->device; 231 232 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); 233 } 234 235 static ssize_t 236 sd_show_allow_restart(struct device *dev, struct device_attribute *attr, 237 char *buf) 238 { 239 struct scsi_disk *sdkp = to_scsi_disk(dev); 240 241 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); 242 } 243 244 static ssize_t 245 sd_show_protection_type(struct device *dev, struct device_attribute *attr, 246 char *buf) 247 { 248 struct scsi_disk *sdkp = to_scsi_disk(dev); 249 250 return snprintf(buf, 20, "%u\n", sdkp->protection_type); 251 } 252 253 static ssize_t 254 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, 255 char *buf) 256 { 257 struct scsi_disk *sdkp = to_scsi_disk(dev); 258 259 return snprintf(buf, 20, "%u\n", sdkp->ATO); 260 } 261 262 static struct device_attribute sd_disk_attrs[] = { 263 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 264 sd_store_cache_type), 265 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), 266 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, 267 sd_store_allow_restart), 268 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, 269 sd_store_manage_start_stop), 270 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), 271 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 272 __ATTR_NULL, 273 }; 274 275 static struct class sd_disk_class = { 276 .name = "scsi_disk", 277 .owner = THIS_MODULE, 278 .dev_release = scsi_disk_release, 279 .dev_attrs = sd_disk_attrs, 280 }; 281 282 static struct scsi_driver sd_template = { 283 .owner = THIS_MODULE, 284 .gendrv = { 285 .name = "sd", 286 .probe = sd_probe, 287 .remove = sd_remove, 288 .suspend = sd_suspend, 289 .resume = sd_resume, 290 .shutdown = sd_shutdown, 291 }, 292 .rescan = sd_rescan, 293 .done = sd_done, 294 }; 295 296 /* 297 * Device no to disk mapping: 298 * 299 * major disc2 disc p1 300 * |............|.............|....|....| <- dev_t 301 * 31 20 19 8 7 4 3 0 302 * 303 * Inside a major, we have 16k disks, however mapped non- 304 * contiguously. The first 16 disks are for major0, the next 305 * ones with major1, ... Disk 256 is for major0 again, disk 272 306 * for major1, ... 307 * As we stay compatible with our numbering scheme, we can reuse 308 * the well-know SCSI majors 8, 65--71, 136--143. 309 */ 310 static int sd_major(int major_idx) 311 { 312 switch (major_idx) { 313 case 0: 314 return SCSI_DISK0_MAJOR; 315 case 1 ... 7: 316 return SCSI_DISK1_MAJOR + major_idx - 1; 317 case 8 ... 15: 318 return SCSI_DISK8_MAJOR + major_idx - 8; 319 default: 320 BUG(); 321 return 0; /* shut up gcc */ 322 } 323 } 324 325 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) 326 { 327 struct scsi_disk *sdkp = NULL; 328 329 if (disk->private_data) { 330 sdkp = scsi_disk(disk); 331 if (scsi_device_get(sdkp->device) == 0) 332 get_device(&sdkp->dev); 333 else 334 sdkp = NULL; 335 } 336 return sdkp; 337 } 338 339 static struct scsi_disk *scsi_disk_get(struct gendisk *disk) 340 { 341 struct scsi_disk *sdkp; 342 343 mutex_lock(&sd_ref_mutex); 344 sdkp = __scsi_disk_get(disk); 345 mutex_unlock(&sd_ref_mutex); 346 return sdkp; 347 } 348 349 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) 350 { 351 struct scsi_disk *sdkp; 352 353 mutex_lock(&sd_ref_mutex); 354 sdkp = dev_get_drvdata(dev); 355 if (sdkp) 356 sdkp = __scsi_disk_get(sdkp->disk); 357 mutex_unlock(&sd_ref_mutex); 358 return sdkp; 359 } 360 361 static void scsi_disk_put(struct scsi_disk *sdkp) 362 { 363 struct scsi_device *sdev = sdkp->device; 364 365 mutex_lock(&sd_ref_mutex); 366 put_device(&sdkp->dev); 367 scsi_device_put(sdev); 368 mutex_unlock(&sd_ref_mutex); 369 } 370 371 /** 372 * sd_init_command - build a scsi (read or write) command from 373 * information in the request structure. 374 * @SCpnt: pointer to mid-level's per scsi command structure that 375 * contains request and into which the scsi command is written 376 * 377 * Returns 1 if successful and 0 if error (or cannot be done now). 378 **/ 379 static int sd_prep_fn(struct request_queue *q, struct request *rq) 380 { 381 struct scsi_cmnd *SCpnt; 382 struct scsi_device *sdp = q->queuedata; 383 struct gendisk *disk = rq->rq_disk; 384 struct scsi_disk *sdkp; 385 sector_t block = rq->sector; 386 sector_t threshold; 387 unsigned int this_count = rq->nr_sectors; 388 int ret, host_dif; 389 390 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 391 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 392 goto out; 393 } else if (rq->cmd_type != REQ_TYPE_FS) { 394 ret = BLKPREP_KILL; 395 goto out; 396 } 397 ret = scsi_setup_fs_cmnd(sdp, rq); 398 if (ret != BLKPREP_OK) 399 goto out; 400 SCpnt = rq->special; 401 sdkp = scsi_disk(disk); 402 403 /* from here on until we're complete, any goto out 404 * is used for a killable error condition */ 405 ret = BLKPREP_KILL; 406 407 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 408 "sd_init_command: block=%llu, " 409 "count=%d\n", 410 (unsigned long long)block, 411 this_count)); 412 413 if (!sdp || !scsi_device_online(sdp) || 414 block + rq->nr_sectors > get_capacity(disk)) { 415 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 416 "Finishing %ld sectors\n", 417 rq->nr_sectors)); 418 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 419 "Retry with 0x%p\n", SCpnt)); 420 goto out; 421 } 422 423 if (sdp->changed) { 424 /* 425 * quietly refuse to do anything to a changed disc until 426 * the changed bit has been reset 427 */ 428 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ 429 goto out; 430 } 431 432 /* 433 * Some SD card readers can't handle multi-sector accesses which touch 434 * the last one or two hardware sectors. Split accesses as needed. 435 */ 436 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * 437 (sdp->sector_size / 512); 438 439 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { 440 if (block < threshold) { 441 /* Access up to the threshold but not beyond */ 442 this_count = threshold - block; 443 } else { 444 /* Access only a single hardware sector */ 445 this_count = sdp->sector_size / 512; 446 } 447 } 448 449 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", 450 (unsigned long long)block)); 451 452 /* 453 * If we have a 1K hardware sectorsize, prevent access to single 454 * 512 byte sectors. In theory we could handle this - in fact 455 * the scsi cdrom driver must be able to handle this because 456 * we typically use 1K blocksizes, and cdroms typically have 457 * 2K hardware sectorsizes. Of course, things are simpler 458 * with the cdrom, since it is read-only. For performance 459 * reasons, the filesystems should be able to handle this 460 * and not force the scsi disk driver to use bounce buffers 461 * for this. 462 */ 463 if (sdp->sector_size == 1024) { 464 if ((block & 1) || (rq->nr_sectors & 1)) { 465 scmd_printk(KERN_ERR, SCpnt, 466 "Bad block number requested\n"); 467 goto out; 468 } else { 469 block = block >> 1; 470 this_count = this_count >> 1; 471 } 472 } 473 if (sdp->sector_size == 2048) { 474 if ((block & 3) || (rq->nr_sectors & 3)) { 475 scmd_printk(KERN_ERR, SCpnt, 476 "Bad block number requested\n"); 477 goto out; 478 } else { 479 block = block >> 2; 480 this_count = this_count >> 2; 481 } 482 } 483 if (sdp->sector_size == 4096) { 484 if ((block & 7) || (rq->nr_sectors & 7)) { 485 scmd_printk(KERN_ERR, SCpnt, 486 "Bad block number requested\n"); 487 goto out; 488 } else { 489 block = block >> 3; 490 this_count = this_count >> 3; 491 } 492 } 493 if (rq_data_dir(rq) == WRITE) { 494 if (!sdp->writeable) { 495 goto out; 496 } 497 SCpnt->cmnd[0] = WRITE_6; 498 SCpnt->sc_data_direction = DMA_TO_DEVICE; 499 500 if (blk_integrity_rq(rq) && 501 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) 502 goto out; 503 504 } else if (rq_data_dir(rq) == READ) { 505 SCpnt->cmnd[0] = READ_6; 506 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 507 } else { 508 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); 509 goto out; 510 } 511 512 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 513 "%s %d/%ld 512 byte blocks.\n", 514 (rq_data_dir(rq) == WRITE) ? 515 "writing" : "reading", this_count, 516 rq->nr_sectors)); 517 518 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ 519 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); 520 if (host_dif) 521 SCpnt->cmnd[1] = 1 << 5; 522 else 523 SCpnt->cmnd[1] = 0; 524 525 if (block > 0xffffffff) { 526 SCpnt->cmnd[0] += READ_16 - READ_6; 527 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; 528 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; 529 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; 530 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; 531 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; 532 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; 533 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; 534 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; 535 SCpnt->cmnd[9] = (unsigned char) block & 0xff; 536 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; 537 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; 538 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; 539 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; 540 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; 541 } else if ((this_count > 0xff) || (block > 0x1fffff) || 542 scsi_device_protection(SCpnt->device) || 543 SCpnt->device->use_10_for_rw) { 544 if (this_count > 0xffff) 545 this_count = 0xffff; 546 547 SCpnt->cmnd[0] += READ_10 - READ_6; 548 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; 549 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 550 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 551 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 552 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 553 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 554 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 555 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 556 } else { 557 if (unlikely(blk_fua_rq(rq))) { 558 /* 559 * This happens only if this drive failed 560 * 10byte rw command with ILLEGAL_REQUEST 561 * during operation and thus turned off 562 * use_10_for_rw. 563 */ 564 scmd_printk(KERN_ERR, SCpnt, 565 "FUA write on READ/WRITE(6) drive\n"); 566 goto out; 567 } 568 569 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); 570 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); 571 SCpnt->cmnd[3] = (unsigned char) block & 0xff; 572 SCpnt->cmnd[4] = (unsigned char) this_count; 573 SCpnt->cmnd[5] = 0; 574 } 575 SCpnt->sdb.length = this_count * sdp->sector_size; 576 577 /* If DIF or DIX is enabled, tell HBA how to handle request */ 578 if (host_dif || scsi_prot_sg_count(SCpnt)) 579 sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt), 580 sdkp->protection_type); 581 582 /* 583 * We shouldn't disconnect in the middle of a sector, so with a dumb 584 * host adapter, it's safe to assume that we can at least transfer 585 * this many bytes between each connect / disconnect. 586 */ 587 SCpnt->transfersize = sdp->sector_size; 588 SCpnt->underflow = this_count << 9; 589 SCpnt->allowed = SD_MAX_RETRIES; 590 591 /* 592 * This indicates that the command is ready from our end to be 593 * queued. 594 */ 595 ret = BLKPREP_OK; 596 out: 597 return scsi_prep_return(q, rq, ret); 598 } 599 600 /** 601 * sd_open - open a scsi disk device 602 * @inode: only i_rdev member may be used 603 * @filp: only f_mode and f_flags may be used 604 * 605 * Returns 0 if successful. Returns a negated errno value in case 606 * of error. 607 * 608 * Note: This can be called from a user context (e.g. fsck(1) ) 609 * or from within the kernel (e.g. as a result of a mount(1) ). 610 * In the latter case @inode and @filp carry an abridged amount 611 * of information as noted above. 612 **/ 613 static int sd_open(struct block_device *bdev, fmode_t mode) 614 { 615 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); 616 struct scsi_device *sdev; 617 int retval; 618 619 if (!sdkp) 620 return -ENXIO; 621 622 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); 623 624 sdev = sdkp->device; 625 626 /* 627 * If the device is in error recovery, wait until it is done. 628 * If the device is offline, then disallow any access to it. 629 */ 630 retval = -ENXIO; 631 if (!scsi_block_when_processing_errors(sdev)) 632 goto error_out; 633 634 if (sdev->removable || sdkp->write_prot) 635 check_disk_change(bdev); 636 637 /* 638 * If the drive is empty, just let the open fail. 639 */ 640 retval = -ENOMEDIUM; 641 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) 642 goto error_out; 643 644 /* 645 * If the device has the write protect tab set, have the open fail 646 * if the user expects to be able to write to the thing. 647 */ 648 retval = -EROFS; 649 if (sdkp->write_prot && (mode & FMODE_WRITE)) 650 goto error_out; 651 652 /* 653 * It is possible that the disk changing stuff resulted in 654 * the device being taken offline. If this is the case, 655 * report this to the user, and don't pretend that the 656 * open actually succeeded. 657 */ 658 retval = -ENXIO; 659 if (!scsi_device_online(sdev)) 660 goto error_out; 661 662 if (!sdkp->openers++ && sdev->removable) { 663 if (scsi_block_when_processing_errors(sdev)) 664 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); 665 } 666 667 return 0; 668 669 error_out: 670 scsi_disk_put(sdkp); 671 return retval; 672 } 673 674 /** 675 * sd_release - invoked when the (last) close(2) is called on this 676 * scsi disk. 677 * @inode: only i_rdev member may be used 678 * @filp: only f_mode and f_flags may be used 679 * 680 * Returns 0. 681 * 682 * Note: may block (uninterruptible) if error recovery is underway 683 * on this disk. 684 **/ 685 static int sd_release(struct gendisk *disk, fmode_t mode) 686 { 687 struct scsi_disk *sdkp = scsi_disk(disk); 688 struct scsi_device *sdev = sdkp->device; 689 690 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); 691 692 if (!--sdkp->openers && sdev->removable) { 693 if (scsi_block_when_processing_errors(sdev)) 694 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); 695 } 696 697 /* 698 * XXX and what if there are packets in flight and this close() 699 * XXX is followed by a "rmmod sd_mod"? 700 */ 701 scsi_disk_put(sdkp); 702 return 0; 703 } 704 705 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 706 { 707 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); 708 struct scsi_device *sdp = sdkp->device; 709 struct Scsi_Host *host = sdp->host; 710 int diskinfo[4]; 711 712 /* default to most commonly used values */ 713 diskinfo[0] = 0x40; /* 1 << 6 */ 714 diskinfo[1] = 0x20; /* 1 << 5 */ 715 diskinfo[2] = sdkp->capacity >> 11; 716 717 /* override with calculated, extended default, or driver values */ 718 if (host->hostt->bios_param) 719 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); 720 else 721 scsicam_bios_param(bdev, sdkp->capacity, diskinfo); 722 723 geo->heads = diskinfo[0]; 724 geo->sectors = diskinfo[1]; 725 geo->cylinders = diskinfo[2]; 726 return 0; 727 } 728 729 /** 730 * sd_ioctl - process an ioctl 731 * @inode: only i_rdev/i_bdev members may be used 732 * @filp: only f_mode and f_flags may be used 733 * @cmd: ioctl command number 734 * @arg: this is third argument given to ioctl(2) system call. 735 * Often contains a pointer. 736 * 737 * Returns 0 if successful (some ioctls return postive numbers on 738 * success as well). Returns a negated errno value in case of error. 739 * 740 * Note: most ioctls are forward onto the block subsystem or further 741 * down in the scsi subsystem. 742 **/ 743 static int sd_ioctl(struct block_device *bdev, fmode_t mode, 744 unsigned int cmd, unsigned long arg) 745 { 746 struct gendisk *disk = bdev->bd_disk; 747 struct scsi_device *sdp = scsi_disk(disk)->device; 748 void __user *p = (void __user *)arg; 749 int error; 750 751 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", 752 disk->disk_name, cmd)); 753 754 /* 755 * If we are in the middle of error recovery, don't let anyone 756 * else try and use this device. Also, if error recovery fails, it 757 * may try and take the device offline, in which case all further 758 * access to the device is prohibited. 759 */ 760 error = scsi_nonblockable_ioctl(sdp, cmd, p, 761 (mode & FMODE_NDELAY) != 0); 762 if (!scsi_block_when_processing_errors(sdp) || !error) 763 return error; 764 765 /* 766 * Send SCSI addressing ioctls directly to mid level, send other 767 * ioctls to block level and then onto mid level if they can't be 768 * resolved. 769 */ 770 switch (cmd) { 771 case SCSI_IOCTL_GET_IDLUN: 772 case SCSI_IOCTL_GET_BUS_NUMBER: 773 return scsi_ioctl(sdp, cmd, p); 774 default: 775 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); 776 if (error != -ENOTTY) 777 return error; 778 } 779 return scsi_ioctl(sdp, cmd, p); 780 } 781 782 static void set_media_not_present(struct scsi_disk *sdkp) 783 { 784 sdkp->media_present = 0; 785 sdkp->capacity = 0; 786 sdkp->device->changed = 1; 787 } 788 789 /** 790 * sd_media_changed - check if our medium changed 791 * @disk: kernel device descriptor 792 * 793 * Returns 0 if not applicable or no change; 1 if change 794 * 795 * Note: this function is invoked from the block subsystem. 796 **/ 797 static int sd_media_changed(struct gendisk *disk) 798 { 799 struct scsi_disk *sdkp = scsi_disk(disk); 800 struct scsi_device *sdp = sdkp->device; 801 struct scsi_sense_hdr *sshdr = NULL; 802 int retval; 803 804 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); 805 806 if (!sdp->removable) 807 return 0; 808 809 /* 810 * If the device is offline, don't send any commands - just pretend as 811 * if the command failed. If the device ever comes back online, we 812 * can deal with it then. It is only because of unrecoverable errors 813 * that we would ever take a device offline in the first place. 814 */ 815 if (!scsi_device_online(sdp)) { 816 set_media_not_present(sdkp); 817 retval = 1; 818 goto out; 819 } 820 821 /* 822 * Using TEST_UNIT_READY enables differentiation between drive with 823 * no cartridge loaded - NOT READY, drive with changed cartridge - 824 * UNIT ATTENTION, or with same cartridge - GOOD STATUS. 825 * 826 * Drives that auto spin down. eg iomega jaz 1G, will be started 827 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever 828 * sd_revalidate() is called. 829 */ 830 retval = -ENODEV; 831 832 if (scsi_block_when_processing_errors(sdp)) { 833 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); 834 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, 835 sshdr); 836 } 837 838 /* 839 * Unable to test, unit probably not ready. This usually 840 * means there is no disc in the drive. Mark as changed, 841 * and we will figure it out later once the drive is 842 * available again. 843 */ 844 if (retval || (scsi_sense_valid(sshdr) && 845 /* 0x3a is medium not present */ 846 sshdr->asc == 0x3a)) { 847 set_media_not_present(sdkp); 848 retval = 1; 849 goto out; 850 } 851 852 /* 853 * For removable scsi disk we have to recognise the presence 854 * of a disk in the drive. This is kept in the struct scsi_disk 855 * struct and tested at open ! Daniel Roche (dan@lectra.fr) 856 */ 857 sdkp->media_present = 1; 858 859 retval = sdp->changed; 860 sdp->changed = 0; 861 out: 862 if (retval != sdkp->previous_state) 863 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); 864 sdkp->previous_state = retval; 865 kfree(sshdr); 866 return retval; 867 } 868 869 static int sd_sync_cache(struct scsi_disk *sdkp) 870 { 871 int retries, res; 872 struct scsi_device *sdp = sdkp->device; 873 struct scsi_sense_hdr sshdr; 874 875 if (!scsi_device_online(sdp)) 876 return -ENODEV; 877 878 879 for (retries = 3; retries > 0; --retries) { 880 unsigned char cmd[10] = { 0 }; 881 882 cmd[0] = SYNCHRONIZE_CACHE; 883 /* 884 * Leave the rest of the command zero to indicate 885 * flush everything. 886 */ 887 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 888 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 889 if (res == 0) 890 break; 891 } 892 893 if (res) { 894 sd_print_result(sdkp, res); 895 if (driver_byte(res) & DRIVER_SENSE) 896 sd_print_sense_hdr(sdkp, &sshdr); 897 } 898 899 if (res) 900 return -EIO; 901 return 0; 902 } 903 904 static void sd_prepare_flush(struct request_queue *q, struct request *rq) 905 { 906 rq->cmd_type = REQ_TYPE_BLOCK_PC; 907 rq->timeout = SD_TIMEOUT; 908 rq->cmd[0] = SYNCHRONIZE_CACHE; 909 rq->cmd_len = 10; 910 } 911 912 static void sd_rescan(struct device *dev) 913 { 914 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 915 916 if (sdkp) { 917 revalidate_disk(sdkp->disk); 918 scsi_disk_put(sdkp); 919 } 920 } 921 922 923 #ifdef CONFIG_COMPAT 924 /* 925 * This gets directly called from VFS. When the ioctl 926 * is not recognized we go back to the other translation paths. 927 */ 928 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, 929 unsigned int cmd, unsigned long arg) 930 { 931 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; 932 933 /* 934 * If we are in the middle of error recovery, don't let anyone 935 * else try and use this device. Also, if error recovery fails, it 936 * may try and take the device offline, in which case all further 937 * access to the device is prohibited. 938 */ 939 if (!scsi_block_when_processing_errors(sdev)) 940 return -ENODEV; 941 942 if (sdev->host->hostt->compat_ioctl) { 943 int ret; 944 945 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); 946 947 return ret; 948 } 949 950 /* 951 * Let the static ioctl translation table take care of it. 952 */ 953 return -ENOIOCTLCMD; 954 } 955 #endif 956 957 static struct block_device_operations sd_fops = { 958 .owner = THIS_MODULE, 959 .open = sd_open, 960 .release = sd_release, 961 .locked_ioctl = sd_ioctl, 962 .getgeo = sd_getgeo, 963 #ifdef CONFIG_COMPAT 964 .compat_ioctl = sd_compat_ioctl, 965 #endif 966 .media_changed = sd_media_changed, 967 .revalidate_disk = sd_revalidate_disk, 968 }; 969 970 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) 971 { 972 u64 start_lba = scmd->request->sector; 973 u64 end_lba = scmd->request->sector + (scsi_bufflen(scmd) / 512); 974 u64 bad_lba; 975 int info_valid; 976 977 if (!blk_fs_request(scmd->request)) 978 return 0; 979 980 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, 981 SCSI_SENSE_BUFFERSIZE, 982 &bad_lba); 983 if (!info_valid) 984 return 0; 985 986 if (scsi_bufflen(scmd) <= scmd->device->sector_size) 987 return 0; 988 989 if (scmd->device->sector_size < 512) { 990 /* only legitimate sector_size here is 256 */ 991 start_lba <<= 1; 992 end_lba <<= 1; 993 } else { 994 /* be careful ... don't want any overflows */ 995 u64 factor = scmd->device->sector_size / 512; 996 do_div(start_lba, factor); 997 do_div(end_lba, factor); 998 } 999 1000 /* The bad lba was reported incorrectly, we have no idea where 1001 * the error is. 1002 */ 1003 if (bad_lba < start_lba || bad_lba >= end_lba) 1004 return 0; 1005 1006 /* This computation should always be done in terms of 1007 * the resolution of the device's medium. 1008 */ 1009 return (bad_lba - start_lba) * scmd->device->sector_size; 1010 } 1011 1012 /** 1013 * sd_done - bottom half handler: called when the lower level 1014 * driver has completed (successfully or otherwise) a scsi command. 1015 * @SCpnt: mid-level's per command structure. 1016 * 1017 * Note: potentially run from within an ISR. Must not block. 1018 **/ 1019 static int sd_done(struct scsi_cmnd *SCpnt) 1020 { 1021 int result = SCpnt->result; 1022 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); 1023 struct scsi_sense_hdr sshdr; 1024 int sense_valid = 0; 1025 int sense_deferred = 0; 1026 1027 if (result) { 1028 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); 1029 if (sense_valid) 1030 sense_deferred = scsi_sense_is_deferred(&sshdr); 1031 } 1032 #ifdef CONFIG_SCSI_LOGGING 1033 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); 1034 if (sense_valid) { 1035 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, 1036 "sd_done: sb[respc,sk,asc," 1037 "ascq]=%x,%x,%x,%x\n", 1038 sshdr.response_code, 1039 sshdr.sense_key, sshdr.asc, 1040 sshdr.ascq)); 1041 } 1042 #endif 1043 if (driver_byte(result) != DRIVER_SENSE && 1044 (!sense_valid || sense_deferred)) 1045 goto out; 1046 1047 switch (sshdr.sense_key) { 1048 case HARDWARE_ERROR: 1049 case MEDIUM_ERROR: 1050 good_bytes = sd_completed_bytes(SCpnt); 1051 break; 1052 case RECOVERED_ERROR: 1053 /* Inform the user, but make sure that it's not treated 1054 * as a hard error. 1055 */ 1056 scsi_print_sense("sd", SCpnt); 1057 SCpnt->result = 0; 1058 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1059 good_bytes = scsi_bufflen(SCpnt); 1060 break; 1061 case NO_SENSE: 1062 /* This indicates a false check condition, so ignore it. An 1063 * unknown amount of data was transferred so treat it as an 1064 * error. 1065 */ 1066 scsi_print_sense("sd", SCpnt); 1067 SCpnt->result = 0; 1068 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 1069 break; 1070 case ABORTED_COMMAND: 1071 if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */ 1072 scsi_print_result(SCpnt); 1073 scsi_print_sense("sd", SCpnt); 1074 good_bytes = sd_completed_bytes(SCpnt); 1075 } 1076 break; 1077 case ILLEGAL_REQUEST: 1078 if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */ 1079 scsi_print_result(SCpnt); 1080 scsi_print_sense("sd", SCpnt); 1081 good_bytes = sd_completed_bytes(SCpnt); 1082 } 1083 break; 1084 default: 1085 break; 1086 } 1087 out: 1088 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) 1089 sd_dif_complete(SCpnt, good_bytes); 1090 1091 return good_bytes; 1092 } 1093 1094 static int media_not_present(struct scsi_disk *sdkp, 1095 struct scsi_sense_hdr *sshdr) 1096 { 1097 1098 if (!scsi_sense_valid(sshdr)) 1099 return 0; 1100 /* not invoked for commands that could return deferred errors */ 1101 if (sshdr->sense_key != NOT_READY && 1102 sshdr->sense_key != UNIT_ATTENTION) 1103 return 0; 1104 if (sshdr->asc != 0x3A) /* medium not present */ 1105 return 0; 1106 1107 set_media_not_present(sdkp); 1108 return 1; 1109 } 1110 1111 /* 1112 * spinup disk - called only in sd_revalidate_disk() 1113 */ 1114 static void 1115 sd_spinup_disk(struct scsi_disk *sdkp) 1116 { 1117 unsigned char cmd[10]; 1118 unsigned long spintime_expire = 0; 1119 int retries, spintime; 1120 unsigned int the_result; 1121 struct scsi_sense_hdr sshdr; 1122 int sense_valid = 0; 1123 1124 spintime = 0; 1125 1126 /* Spin up drives, as required. Only do this at boot time */ 1127 /* Spinup needs to be done for module loads too. */ 1128 do { 1129 retries = 0; 1130 1131 do { 1132 cmd[0] = TEST_UNIT_READY; 1133 memset((void *) &cmd[1], 0, 9); 1134 1135 the_result = scsi_execute_req(sdkp->device, cmd, 1136 DMA_NONE, NULL, 0, 1137 &sshdr, SD_TIMEOUT, 1138 SD_MAX_RETRIES, NULL); 1139 1140 /* 1141 * If the drive has indicated to us that it 1142 * doesn't have any media in it, don't bother 1143 * with any more polling. 1144 */ 1145 if (media_not_present(sdkp, &sshdr)) 1146 return; 1147 1148 if (the_result) 1149 sense_valid = scsi_sense_valid(&sshdr); 1150 retries++; 1151 } while (retries < 3 && 1152 (!scsi_status_is_good(the_result) || 1153 ((driver_byte(the_result) & DRIVER_SENSE) && 1154 sense_valid && sshdr.sense_key == UNIT_ATTENTION))); 1155 1156 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { 1157 /* no sense, TUR either succeeded or failed 1158 * with a status error */ 1159 if(!spintime && !scsi_status_is_good(the_result)) { 1160 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1161 sd_print_result(sdkp, the_result); 1162 } 1163 break; 1164 } 1165 1166 /* 1167 * The device does not want the automatic start to be issued. 1168 */ 1169 if (sdkp->device->no_start_on_add) { 1170 break; 1171 } 1172 1173 /* 1174 * If manual intervention is required, or this is an 1175 * absent USB storage device, a spinup is meaningless. 1176 */ 1177 if (sense_valid && 1178 sshdr.sense_key == NOT_READY && 1179 sshdr.asc == 4 && sshdr.ascq == 3) { 1180 break; /* manual intervention required */ 1181 1182 /* 1183 * Issue command to spin up drive when not ready 1184 */ 1185 } else if (sense_valid && sshdr.sense_key == NOT_READY) { 1186 if (!spintime) { 1187 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); 1188 cmd[0] = START_STOP; 1189 cmd[1] = 1; /* Return immediately */ 1190 memset((void *) &cmd[2], 0, 8); 1191 cmd[4] = 1; /* Start spin cycle */ 1192 if (sdkp->device->start_stop_pwr_cond) 1193 cmd[4] |= 1 << 4; 1194 scsi_execute_req(sdkp->device, cmd, DMA_NONE, 1195 NULL, 0, &sshdr, 1196 SD_TIMEOUT, SD_MAX_RETRIES, 1197 NULL); 1198 spintime_expire = jiffies + 100 * HZ; 1199 spintime = 1; 1200 } 1201 /* Wait 1 second for next try */ 1202 msleep(1000); 1203 printk("."); 1204 1205 /* 1206 * Wait for USB flash devices with slow firmware. 1207 * Yes, this sense key/ASC combination shouldn't 1208 * occur here. It's characteristic of these devices. 1209 */ 1210 } else if (sense_valid && 1211 sshdr.sense_key == UNIT_ATTENTION && 1212 sshdr.asc == 0x28) { 1213 if (!spintime) { 1214 spintime_expire = jiffies + 5 * HZ; 1215 spintime = 1; 1216 } 1217 /* Wait 1 second for next try */ 1218 msleep(1000); 1219 } else { 1220 /* we don't understand the sense code, so it's 1221 * probably pointless to loop */ 1222 if(!spintime) { 1223 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); 1224 sd_print_sense_hdr(sdkp, &sshdr); 1225 } 1226 break; 1227 } 1228 1229 } while (spintime && time_before_eq(jiffies, spintime_expire)); 1230 1231 if (spintime) { 1232 if (scsi_status_is_good(the_result)) 1233 printk("ready\n"); 1234 else 1235 printk("not responding...\n"); 1236 } 1237 } 1238 1239 1240 /* 1241 * Determine whether disk supports Data Integrity Field. 1242 */ 1243 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) 1244 { 1245 struct scsi_device *sdp = sdkp->device; 1246 u8 type; 1247 1248 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) 1249 type = 0; 1250 else 1251 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ 1252 1253 sdkp->protection_type = type; 1254 1255 switch (type) { 1256 case SD_DIF_TYPE0_PROTECTION: 1257 case SD_DIF_TYPE1_PROTECTION: 1258 case SD_DIF_TYPE3_PROTECTION: 1259 break; 1260 1261 case SD_DIF_TYPE2_PROTECTION: 1262 sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \ 1263 "protection which is currently unsupported. " \ 1264 "Disabling disk!\n"); 1265 goto disable; 1266 1267 default: 1268 sd_printk(KERN_ERR, sdkp, "formatted with unknown " \ 1269 "protection type %d. Disabling disk!\n", type); 1270 goto disable; 1271 } 1272 1273 return; 1274 1275 disable: 1276 sdkp->capacity = 0; 1277 } 1278 1279 /* 1280 * read disk capacity 1281 */ 1282 static void 1283 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) 1284 { 1285 unsigned char cmd[16]; 1286 int the_result, retries; 1287 int sector_size = 0; 1288 /* Force READ CAPACITY(16) when PROTECT=1 */ 1289 int longrc = scsi_device_protection(sdkp->device) ? 1 : 0; 1290 struct scsi_sense_hdr sshdr; 1291 int sense_valid = 0; 1292 struct scsi_device *sdp = sdkp->device; 1293 1294 repeat: 1295 retries = 3; 1296 do { 1297 if (longrc) { 1298 memset((void *) cmd, 0, 16); 1299 cmd[0] = SERVICE_ACTION_IN; 1300 cmd[1] = SAI_READ_CAPACITY_16; 1301 cmd[13] = 13; 1302 memset((void *) buffer, 0, 13); 1303 } else { 1304 cmd[0] = READ_CAPACITY; 1305 memset((void *) &cmd[1], 0, 9); 1306 memset((void *) buffer, 0, 8); 1307 } 1308 1309 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, 1310 buffer, longrc ? 13 : 8, &sshdr, 1311 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 1312 1313 if (media_not_present(sdkp, &sshdr)) 1314 return; 1315 1316 if (the_result) 1317 sense_valid = scsi_sense_valid(&sshdr); 1318 retries--; 1319 1320 } while (the_result && retries); 1321 1322 if (the_result && !longrc) { 1323 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); 1324 sd_print_result(sdkp, the_result); 1325 if (driver_byte(the_result) & DRIVER_SENSE) 1326 sd_print_sense_hdr(sdkp, &sshdr); 1327 else 1328 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); 1329 1330 /* Set dirty bit for removable devices if not ready - 1331 * sometimes drives will not report this properly. */ 1332 if (sdp->removable && 1333 sense_valid && sshdr.sense_key == NOT_READY) 1334 sdp->changed = 1; 1335 1336 /* Either no media are present but the drive didn't tell us, 1337 or they are present but the read capacity command fails */ 1338 /* sdkp->media_present = 0; -- not always correct */ 1339 sdkp->capacity = 0; /* unknown mapped to zero - as usual */ 1340 1341 return; 1342 } else if (the_result && longrc) { 1343 /* READ CAPACITY(16) has been failed */ 1344 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); 1345 sd_print_result(sdkp, the_result); 1346 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n"); 1347 1348 sdkp->capacity = 1 + (sector_t) 0xffffffff; 1349 goto got_data; 1350 } 1351 1352 if (!longrc) { 1353 sector_size = (buffer[4] << 24) | 1354 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 1355 if (buffer[0] == 0xff && buffer[1] == 0xff && 1356 buffer[2] == 0xff && buffer[3] == 0xff) { 1357 if(sizeof(sdkp->capacity) > 4) { 1358 sd_printk(KERN_NOTICE, sdkp, "Very big device. " 1359 "Trying to use READ CAPACITY(16).\n"); 1360 longrc = 1; 1361 goto repeat; 1362 } 1363 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use " 1364 "a kernel compiled with support for large " 1365 "block devices.\n"); 1366 sdkp->capacity = 0; 1367 goto got_data; 1368 } 1369 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | 1370 (buffer[1] << 16) | 1371 (buffer[2] << 8) | 1372 buffer[3]); 1373 } else { 1374 sdkp->capacity = 1 + (((u64)buffer[0] << 56) | 1375 ((u64)buffer[1] << 48) | 1376 ((u64)buffer[2] << 40) | 1377 ((u64)buffer[3] << 32) | 1378 ((sector_t)buffer[4] << 24) | 1379 ((sector_t)buffer[5] << 16) | 1380 ((sector_t)buffer[6] << 8) | 1381 (sector_t)buffer[7]); 1382 1383 sector_size = (buffer[8] << 24) | 1384 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; 1385 1386 sd_read_protection_type(sdkp, buffer); 1387 } 1388 1389 /* Some devices return the total number of sectors, not the 1390 * highest sector number. Make the necessary adjustment. */ 1391 if (sdp->fix_capacity) { 1392 --sdkp->capacity; 1393 1394 /* Some devices have version which report the correct sizes 1395 * and others which do not. We guess size according to a heuristic 1396 * and err on the side of lowering the capacity. */ 1397 } else { 1398 if (sdp->guess_capacity) 1399 if (sdkp->capacity & 0x01) /* odd sizes are odd */ 1400 --sdkp->capacity; 1401 } 1402 1403 got_data: 1404 if (sector_size == 0) { 1405 sector_size = 512; 1406 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " 1407 "assuming 512.\n"); 1408 } 1409 1410 if (sector_size != 512 && 1411 sector_size != 1024 && 1412 sector_size != 2048 && 1413 sector_size != 4096 && 1414 sector_size != 256) { 1415 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", 1416 sector_size); 1417 /* 1418 * The user might want to re-format the drive with 1419 * a supported sectorsize. Once this happens, it 1420 * would be relatively trivial to set the thing up. 1421 * For this reason, we leave the thing in the table. 1422 */ 1423 sdkp->capacity = 0; 1424 /* 1425 * set a bogus sector size so the normal read/write 1426 * logic in the block layer will eventually refuse any 1427 * request on this device without tripping over power 1428 * of two sector size assumptions 1429 */ 1430 sector_size = 512; 1431 } 1432 blk_queue_hardsect_size(sdp->request_queue, sector_size); 1433 1434 { 1435 char cap_str_2[10], cap_str_10[10]; 1436 u64 sz = (u64)sdkp->capacity << ilog2(sector_size); 1437 1438 string_get_size(sz, STRING_UNITS_2, cap_str_2, 1439 sizeof(cap_str_2)); 1440 string_get_size(sz, STRING_UNITS_10, cap_str_10, 1441 sizeof(cap_str_10)); 1442 1443 sd_printk(KERN_NOTICE, sdkp, 1444 "%llu %d-byte hardware sectors: (%s/%s)\n", 1445 (unsigned long long)sdkp->capacity, 1446 sector_size, cap_str_10, cap_str_2); 1447 } 1448 1449 /* Rescale capacity to 512-byte units */ 1450 if (sector_size == 4096) 1451 sdkp->capacity <<= 3; 1452 else if (sector_size == 2048) 1453 sdkp->capacity <<= 2; 1454 else if (sector_size == 1024) 1455 sdkp->capacity <<= 1; 1456 else if (sector_size == 256) 1457 sdkp->capacity >>= 1; 1458 1459 sdkp->device->sector_size = sector_size; 1460 } 1461 1462 /* called with buffer of length 512 */ 1463 static inline int 1464 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, 1465 unsigned char *buffer, int len, struct scsi_mode_data *data, 1466 struct scsi_sense_hdr *sshdr) 1467 { 1468 return scsi_mode_sense(sdp, dbd, modepage, buffer, len, 1469 SD_TIMEOUT, SD_MAX_RETRIES, data, 1470 sshdr); 1471 } 1472 1473 /* 1474 * read write protect setting, if possible - called only in sd_revalidate_disk() 1475 * called with buffer of length SD_BUF_SIZE 1476 */ 1477 static void 1478 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) 1479 { 1480 int res; 1481 struct scsi_device *sdp = sdkp->device; 1482 struct scsi_mode_data data; 1483 1484 set_disk_ro(sdkp->disk, 0); 1485 if (sdp->skip_ms_page_3f) { 1486 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); 1487 return; 1488 } 1489 1490 if (sdp->use_192_bytes_for_3f) { 1491 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); 1492 } else { 1493 /* 1494 * First attempt: ask for all pages (0x3F), but only 4 bytes. 1495 * We have to start carefully: some devices hang if we ask 1496 * for more than is available. 1497 */ 1498 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); 1499 1500 /* 1501 * Second attempt: ask for page 0 When only page 0 is 1502 * implemented, a request for page 3F may return Sense Key 1503 * 5: Illegal Request, Sense Code 24: Invalid field in 1504 * CDB. 1505 */ 1506 if (!scsi_status_is_good(res)) 1507 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); 1508 1509 /* 1510 * Third attempt: ask 255 bytes, as we did earlier. 1511 */ 1512 if (!scsi_status_is_good(res)) 1513 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, 1514 &data, NULL); 1515 } 1516 1517 if (!scsi_status_is_good(res)) { 1518 sd_printk(KERN_WARNING, sdkp, 1519 "Test WP failed, assume Write Enabled\n"); 1520 } else { 1521 sdkp->write_prot = ((data.device_specific & 0x80) != 0); 1522 set_disk_ro(sdkp->disk, sdkp->write_prot); 1523 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", 1524 sdkp->write_prot ? "on" : "off"); 1525 sd_printk(KERN_DEBUG, sdkp, 1526 "Mode Sense: %02x %02x %02x %02x\n", 1527 buffer[0], buffer[1], buffer[2], buffer[3]); 1528 } 1529 } 1530 1531 /* 1532 * sd_read_cache_type - called only from sd_revalidate_disk() 1533 * called with buffer of length SD_BUF_SIZE 1534 */ 1535 static void 1536 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) 1537 { 1538 int len = 0, res; 1539 struct scsi_device *sdp = sdkp->device; 1540 1541 int dbd; 1542 int modepage; 1543 struct scsi_mode_data data; 1544 struct scsi_sense_hdr sshdr; 1545 1546 if (sdp->skip_ms_page_8) 1547 goto defaults; 1548 1549 if (sdp->type == TYPE_RBC) { 1550 modepage = 6; 1551 dbd = 8; 1552 } else { 1553 modepage = 8; 1554 dbd = 0; 1555 } 1556 1557 /* cautiously ask */ 1558 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); 1559 1560 if (!scsi_status_is_good(res)) 1561 goto bad_sense; 1562 1563 if (!data.header_length) { 1564 modepage = 6; 1565 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); 1566 } 1567 1568 /* that went OK, now ask for the proper length */ 1569 len = data.length; 1570 1571 /* 1572 * We're only interested in the first three bytes, actually. 1573 * But the data cache page is defined for the first 20. 1574 */ 1575 if (len < 3) 1576 goto bad_sense; 1577 if (len > 20) 1578 len = 20; 1579 1580 /* Take headers and block descriptors into account */ 1581 len += data.header_length + data.block_descriptor_length; 1582 if (len > SD_BUF_SIZE) 1583 goto bad_sense; 1584 1585 /* Get the data */ 1586 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); 1587 1588 if (scsi_status_is_good(res)) { 1589 int offset = data.header_length + data.block_descriptor_length; 1590 1591 if (offset >= SD_BUF_SIZE - 2) { 1592 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); 1593 goto defaults; 1594 } 1595 1596 if ((buffer[offset] & 0x3f) != modepage) { 1597 sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); 1598 goto defaults; 1599 } 1600 1601 if (modepage == 8) { 1602 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); 1603 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); 1604 } else { 1605 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); 1606 sdkp->RCD = 0; 1607 } 1608 1609 sdkp->DPOFUA = (data.device_specific & 0x10) != 0; 1610 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { 1611 sd_printk(KERN_NOTICE, sdkp, 1612 "Uses READ/WRITE(6), disabling FUA\n"); 1613 sdkp->DPOFUA = 0; 1614 } 1615 1616 sd_printk(KERN_NOTICE, sdkp, 1617 "Write cache: %s, read cache: %s, %s\n", 1618 sdkp->WCE ? "enabled" : "disabled", 1619 sdkp->RCD ? "disabled" : "enabled", 1620 sdkp->DPOFUA ? "supports DPO and FUA" 1621 : "doesn't support DPO or FUA"); 1622 1623 return; 1624 } 1625 1626 bad_sense: 1627 if (scsi_sense_valid(&sshdr) && 1628 sshdr.sense_key == ILLEGAL_REQUEST && 1629 sshdr.asc == 0x24 && sshdr.ascq == 0x0) 1630 /* Invalid field in CDB */ 1631 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); 1632 else 1633 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); 1634 1635 defaults: 1636 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); 1637 sdkp->WCE = 0; 1638 sdkp->RCD = 0; 1639 sdkp->DPOFUA = 0; 1640 } 1641 1642 /* 1643 * The ATO bit indicates whether the DIF application tag is available 1644 * for use by the operating system. 1645 */ 1646 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) 1647 { 1648 int res, offset; 1649 struct scsi_device *sdp = sdkp->device; 1650 struct scsi_mode_data data; 1651 struct scsi_sense_hdr sshdr; 1652 1653 if (sdp->type != TYPE_DISK) 1654 return; 1655 1656 if (sdkp->protection_type == 0) 1657 return; 1658 1659 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, 1660 SD_MAX_RETRIES, &data, &sshdr); 1661 1662 if (!scsi_status_is_good(res) || !data.header_length || 1663 data.length < 6) { 1664 sd_printk(KERN_WARNING, sdkp, 1665 "getting Control mode page failed, assume no ATO\n"); 1666 1667 if (scsi_sense_valid(&sshdr)) 1668 sd_print_sense_hdr(sdkp, &sshdr); 1669 1670 return; 1671 } 1672 1673 offset = data.header_length + data.block_descriptor_length; 1674 1675 if ((buffer[offset] & 0x3f) != 0x0a) { 1676 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); 1677 return; 1678 } 1679 1680 if ((buffer[offset + 5] & 0x80) == 0) 1681 return; 1682 1683 sdkp->ATO = 1; 1684 1685 return; 1686 } 1687 1688 /** 1689 * sd_revalidate_disk - called the first time a new disk is seen, 1690 * performs disk spin up, read_capacity, etc. 1691 * @disk: struct gendisk we care about 1692 **/ 1693 static int sd_revalidate_disk(struct gendisk *disk) 1694 { 1695 struct scsi_disk *sdkp = scsi_disk(disk); 1696 struct scsi_device *sdp = sdkp->device; 1697 unsigned char *buffer; 1698 unsigned ordered; 1699 1700 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, 1701 "sd_revalidate_disk\n")); 1702 1703 /* 1704 * If the device is offline, don't try and read capacity or any 1705 * of the other niceties. 1706 */ 1707 if (!scsi_device_online(sdp)) 1708 goto out; 1709 1710 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); 1711 if (!buffer) { 1712 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " 1713 "allocation failure.\n"); 1714 goto out; 1715 } 1716 1717 /* defaults, until the device tells us otherwise */ 1718 sdp->sector_size = 512; 1719 sdkp->capacity = 0; 1720 sdkp->media_present = 1; 1721 sdkp->write_prot = 0; 1722 sdkp->WCE = 0; 1723 sdkp->RCD = 0; 1724 sdkp->ATO = 0; 1725 1726 sd_spinup_disk(sdkp); 1727 1728 /* 1729 * Without media there is no reason to ask; moreover, some devices 1730 * react badly if we do. 1731 */ 1732 if (sdkp->media_present) { 1733 sd_read_capacity(sdkp, buffer); 1734 sd_read_write_protect_flag(sdkp, buffer); 1735 sd_read_cache_type(sdkp, buffer); 1736 sd_read_app_tag_own(sdkp, buffer); 1737 } 1738 1739 /* 1740 * We now have all cache related info, determine how we deal 1741 * with ordered requests. Note that as the current SCSI 1742 * dispatch function can alter request order, we cannot use 1743 * QUEUE_ORDERED_TAG_* even when ordered tag is supported. 1744 */ 1745 if (sdkp->WCE) 1746 ordered = sdkp->DPOFUA 1747 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; 1748 else 1749 ordered = QUEUE_ORDERED_DRAIN; 1750 1751 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); 1752 1753 set_capacity(disk, sdkp->capacity); 1754 kfree(buffer); 1755 1756 out: 1757 return 0; 1758 } 1759 1760 /** 1761 * sd_format_disk_name - format disk name 1762 * @prefix: name prefix - ie. "sd" for SCSI disks 1763 * @index: index of the disk to format name for 1764 * @buf: output buffer 1765 * @buflen: length of the output buffer 1766 * 1767 * SCSI disk names starts at sda. The 26th device is sdz and the 1768 * 27th is sdaa. The last one for two lettered suffix is sdzz 1769 * which is followed by sdaaa. 1770 * 1771 * This is basically 26 base counting with one extra 'nil' entry 1772 * at the beggining from the second digit on and can be 1773 * determined using similar method as 26 base conversion with the 1774 * index shifted -1 after each digit is computed. 1775 * 1776 * CONTEXT: 1777 * Don't care. 1778 * 1779 * RETURNS: 1780 * 0 on success, -errno on failure. 1781 */ 1782 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 1783 { 1784 const int base = 'z' - 'a' + 1; 1785 char *begin = buf + strlen(prefix); 1786 char *end = buf + buflen; 1787 char *p; 1788 int unit; 1789 1790 p = end - 1; 1791 *p = '\0'; 1792 unit = base; 1793 do { 1794 if (p == begin) 1795 return -EINVAL; 1796 *--p = 'a' + (index % unit); 1797 index = (index / unit) - 1; 1798 } while (index >= 0); 1799 1800 memmove(begin, p, end - p); 1801 memcpy(buf, prefix, strlen(prefix)); 1802 1803 return 0; 1804 } 1805 1806 /* 1807 * The asynchronous part of sd_probe 1808 */ 1809 static void sd_probe_async(void *data, async_cookie_t cookie) 1810 { 1811 struct scsi_disk *sdkp = data; 1812 struct scsi_device *sdp; 1813 struct gendisk *gd; 1814 u32 index; 1815 struct device *dev; 1816 1817 sdp = sdkp->device; 1818 gd = sdkp->disk; 1819 index = sdkp->index; 1820 dev = &sdp->sdev_gendev; 1821 1822 if (!sdp->request_queue->rq_timeout) { 1823 if (sdp->type != TYPE_MOD) 1824 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); 1825 else 1826 blk_queue_rq_timeout(sdp->request_queue, 1827 SD_MOD_TIMEOUT); 1828 } 1829 1830 device_initialize(&sdkp->dev); 1831 sdkp->dev.parent = &sdp->sdev_gendev; 1832 sdkp->dev.class = &sd_disk_class; 1833 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); 1834 1835 if (device_add(&sdkp->dev)) 1836 goto out_free_index; 1837 1838 get_device(&sdp->sdev_gendev); 1839 1840 if (index < SD_MAX_DISKS) { 1841 gd->major = sd_major((index & 0xf0) >> 4); 1842 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); 1843 gd->minors = SD_MINORS; 1844 } 1845 gd->fops = &sd_fops; 1846 gd->private_data = &sdkp->driver; 1847 gd->queue = sdkp->device->request_queue; 1848 1849 sd_revalidate_disk(gd); 1850 1851 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); 1852 1853 gd->driverfs_dev = &sdp->sdev_gendev; 1854 gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS; 1855 if (sdp->removable) 1856 gd->flags |= GENHD_FL_REMOVABLE; 1857 1858 dev_set_drvdata(dev, sdkp); 1859 add_disk(gd); 1860 sd_dif_config_host(sdkp); 1861 1862 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", 1863 sdp->removable ? "removable " : ""); 1864 1865 return; 1866 1867 out_free_index: 1868 ida_remove(&sd_index_ida, index); 1869 } 1870 1871 /** 1872 * sd_probe - called during driver initialization and whenever a 1873 * new scsi device is attached to the system. It is called once 1874 * for each scsi device (not just disks) present. 1875 * @dev: pointer to device object 1876 * 1877 * Returns 0 if successful (or not interested in this scsi device 1878 * (e.g. scanner)); 1 when there is an error. 1879 * 1880 * Note: this function is invoked from the scsi mid-level. 1881 * This function sets up the mapping between a given 1882 * <host,channel,id,lun> (found in sdp) and new device name 1883 * (e.g. /dev/sda). More precisely it is the block device major 1884 * and minor number that is chosen here. 1885 * 1886 * Assume sd_attach is not re-entrant (for time being) 1887 * Also think about sd_attach() and sd_remove() running coincidentally. 1888 **/ 1889 static int sd_probe(struct device *dev) 1890 { 1891 struct scsi_device *sdp = to_scsi_device(dev); 1892 struct scsi_disk *sdkp; 1893 struct gendisk *gd; 1894 u32 index; 1895 int error; 1896 1897 error = -ENODEV; 1898 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) 1899 goto out; 1900 1901 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, 1902 "sd_attach\n")); 1903 1904 error = -ENOMEM; 1905 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); 1906 if (!sdkp) 1907 goto out; 1908 1909 gd = alloc_disk(SD_MINORS); 1910 if (!gd) 1911 goto out_free; 1912 1913 do { 1914 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) 1915 goto out_put; 1916 1917 error = ida_get_new(&sd_index_ida, &index); 1918 } while (error == -EAGAIN); 1919 1920 if (error) 1921 goto out_put; 1922 1923 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); 1924 if (error) 1925 goto out_free_index; 1926 1927 sdkp->device = sdp; 1928 sdkp->driver = &sd_template; 1929 sdkp->disk = gd; 1930 sdkp->index = index; 1931 sdkp->openers = 0; 1932 sdkp->previous_state = 1; 1933 1934 async_schedule(sd_probe_async, sdkp); 1935 1936 return 0; 1937 1938 out_free_index: 1939 ida_remove(&sd_index_ida, index); 1940 out_put: 1941 put_disk(gd); 1942 out_free: 1943 kfree(sdkp); 1944 out: 1945 return error; 1946 } 1947 1948 /** 1949 * sd_remove - called whenever a scsi disk (previously recognized by 1950 * sd_probe) is detached from the system. It is called (potentially 1951 * multiple times) during sd module unload. 1952 * @sdp: pointer to mid level scsi device object 1953 * 1954 * Note: this function is invoked from the scsi mid-level. 1955 * This function potentially frees up a device name (e.g. /dev/sdc) 1956 * that could be re-used by a subsequent sd_probe(). 1957 * This function is not called when the built-in sd driver is "exit-ed". 1958 **/ 1959 static int sd_remove(struct device *dev) 1960 { 1961 struct scsi_disk *sdkp = dev_get_drvdata(dev); 1962 1963 device_del(&sdkp->dev); 1964 del_gendisk(sdkp->disk); 1965 sd_shutdown(dev); 1966 1967 mutex_lock(&sd_ref_mutex); 1968 dev_set_drvdata(dev, NULL); 1969 put_device(&sdkp->dev); 1970 mutex_unlock(&sd_ref_mutex); 1971 1972 return 0; 1973 } 1974 1975 /** 1976 * scsi_disk_release - Called to free the scsi_disk structure 1977 * @dev: pointer to embedded class device 1978 * 1979 * sd_ref_mutex must be held entering this routine. Because it is 1980 * called on last put, you should always use the scsi_disk_get() 1981 * scsi_disk_put() helpers which manipulate the semaphore directly 1982 * and never do a direct put_device. 1983 **/ 1984 static void scsi_disk_release(struct device *dev) 1985 { 1986 struct scsi_disk *sdkp = to_scsi_disk(dev); 1987 struct gendisk *disk = sdkp->disk; 1988 1989 ida_remove(&sd_index_ida, sdkp->index); 1990 1991 disk->private_data = NULL; 1992 put_disk(disk); 1993 put_device(&sdkp->device->sdev_gendev); 1994 1995 kfree(sdkp); 1996 } 1997 1998 static int sd_start_stop_device(struct scsi_disk *sdkp, int start) 1999 { 2000 unsigned char cmd[6] = { START_STOP }; /* START_VALID */ 2001 struct scsi_sense_hdr sshdr; 2002 struct scsi_device *sdp = sdkp->device; 2003 int res; 2004 2005 if (start) 2006 cmd[4] |= 1; /* START */ 2007 2008 if (sdp->start_stop_pwr_cond) 2009 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ 2010 2011 if (!scsi_device_online(sdp)) 2012 return -ENODEV; 2013 2014 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, 2015 SD_TIMEOUT, SD_MAX_RETRIES, NULL); 2016 if (res) { 2017 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); 2018 sd_print_result(sdkp, res); 2019 if (driver_byte(res) & DRIVER_SENSE) 2020 sd_print_sense_hdr(sdkp, &sshdr); 2021 } 2022 2023 return res; 2024 } 2025 2026 /* 2027 * Send a SYNCHRONIZE CACHE instruction down to the device through 2028 * the normal SCSI command structure. Wait for the command to 2029 * complete. 2030 */ 2031 static void sd_shutdown(struct device *dev) 2032 { 2033 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2034 2035 if (!sdkp) 2036 return; /* this can happen */ 2037 2038 if (sdkp->WCE) { 2039 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2040 sd_sync_cache(sdkp); 2041 } 2042 2043 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { 2044 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2045 sd_start_stop_device(sdkp, 0); 2046 } 2047 2048 scsi_disk_put(sdkp); 2049 } 2050 2051 static int sd_suspend(struct device *dev, pm_message_t mesg) 2052 { 2053 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2054 int ret = 0; 2055 2056 if (!sdkp) 2057 return 0; /* this can happen */ 2058 2059 if (sdkp->WCE) { 2060 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); 2061 ret = sd_sync_cache(sdkp); 2062 if (ret) 2063 goto done; 2064 } 2065 2066 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { 2067 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); 2068 ret = sd_start_stop_device(sdkp, 0); 2069 } 2070 2071 done: 2072 scsi_disk_put(sdkp); 2073 return ret; 2074 } 2075 2076 static int sd_resume(struct device *dev) 2077 { 2078 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); 2079 int ret = 0; 2080 2081 if (!sdkp->device->manage_start_stop) 2082 goto done; 2083 2084 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); 2085 ret = sd_start_stop_device(sdkp, 1); 2086 2087 done: 2088 scsi_disk_put(sdkp); 2089 return ret; 2090 } 2091 2092 /** 2093 * init_sd - entry point for this driver (both when built in or when 2094 * a module). 2095 * 2096 * Note: this function registers this driver with the scsi mid-level. 2097 **/ 2098 static int __init init_sd(void) 2099 { 2100 int majors = 0, i, err; 2101 2102 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); 2103 2104 for (i = 0; i < SD_MAJORS; i++) 2105 if (register_blkdev(sd_major(i), "sd") == 0) 2106 majors++; 2107 2108 if (!majors) 2109 return -ENODEV; 2110 2111 err = class_register(&sd_disk_class); 2112 if (err) 2113 goto err_out; 2114 2115 err = scsi_register_driver(&sd_template.gendrv); 2116 if (err) 2117 goto err_out_class; 2118 2119 return 0; 2120 2121 err_out_class: 2122 class_unregister(&sd_disk_class); 2123 err_out: 2124 for (i = 0; i < SD_MAJORS; i++) 2125 unregister_blkdev(sd_major(i), "sd"); 2126 return err; 2127 } 2128 2129 /** 2130 * exit_sd - exit point for this driver (when it is a module). 2131 * 2132 * Note: this function unregisters this driver from the scsi mid-level. 2133 **/ 2134 static void __exit exit_sd(void) 2135 { 2136 int i; 2137 2138 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); 2139 2140 scsi_unregister_driver(&sd_template.gendrv); 2141 class_unregister(&sd_disk_class); 2142 2143 for (i = 0; i < SD_MAJORS; i++) 2144 unregister_blkdev(sd_major(i), "sd"); 2145 } 2146 2147 module_init(init_sd); 2148 module_exit(exit_sd); 2149 2150 static void sd_print_sense_hdr(struct scsi_disk *sdkp, 2151 struct scsi_sense_hdr *sshdr) 2152 { 2153 sd_printk(KERN_INFO, sdkp, ""); 2154 scsi_show_sense_hdr(sshdr); 2155 sd_printk(KERN_INFO, sdkp, ""); 2156 scsi_show_extd_sense(sshdr->asc, sshdr->ascq); 2157 } 2158 2159 static void sd_print_result(struct scsi_disk *sdkp, int result) 2160 { 2161 sd_printk(KERN_INFO, sdkp, ""); 2162 scsi_show_result(result); 2163 } 2164 2165