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