1 /* 2 * sr.c Copyright (C) 1992 David Giller 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * adapted from: 6 * sd.c Copyright (C) 1992 Drew Eckhardt 7 * Linux scsi disk driver by 8 * Drew Eckhardt <drew@colorado.edu> 9 * 10 * Modified by Eric Youngdale ericy@andante.org to 11 * add scatter-gather, multiple outstanding request, and other 12 * enhancements. 13 * 14 * Modified by Eric Youngdale eric@andante.org to support loadable 15 * low-level scsi drivers. 16 * 17 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to 18 * provide auto-eject. 19 * 20 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the 21 * generic cdrom interface 22 * 23 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() 24 * interface, capabilities probe additions, ioctl cleanups, etc. 25 * 26 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs 27 * 28 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM 29 * transparently and lose the GHOST hack 30 * 31 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> 32 * check resource allocation in sr_init and some cleanups 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/string.h> 41 #include <linux/errno.h> 42 #include <linux/cdrom.h> 43 #include <linux/interrupt.h> 44 #include <linux/init.h> 45 #include <linux/blkdev.h> 46 #include <linux/mutex.h> 47 #include <linux/slab.h> 48 #include <linux/pm_runtime.h> 49 #include <linux/uaccess.h> 50 51 #include <scsi/scsi.h> 52 #include <scsi/scsi_dbg.h> 53 #include <scsi/scsi_device.h> 54 #include <scsi/scsi_driver.h> 55 #include <scsi/scsi_cmnd.h> 56 #include <scsi/scsi_eh.h> 57 #include <scsi/scsi_host.h> 58 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 59 60 #include "scsi_logging.h" 61 #include "sr.h" 62 63 64 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 65 MODULE_LICENSE("GPL"); 66 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 67 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 68 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 69 70 #define SR_DISKS 256 71 72 #define SR_CAPABILITIES \ 73 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 74 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 75 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 76 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 77 CDC_MRW|CDC_MRW_W|CDC_RAM) 78 79 static DEFINE_MUTEX(sr_mutex); 80 static int sr_probe(struct device *); 81 static int sr_remove(struct device *); 82 static int sr_init_command(struct scsi_cmnd *SCpnt); 83 static int sr_done(struct scsi_cmnd *); 84 static int sr_runtime_suspend(struct device *dev); 85 86 static const struct dev_pm_ops sr_pm_ops = { 87 .runtime_suspend = sr_runtime_suspend, 88 }; 89 90 static struct scsi_driver sr_template = { 91 .gendrv = { 92 .name = "sr", 93 .owner = THIS_MODULE, 94 .probe = sr_probe, 95 .remove = sr_remove, 96 .pm = &sr_pm_ops, 97 }, 98 .init_command = sr_init_command, 99 .done = sr_done, 100 }; 101 102 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 103 static DEFINE_SPINLOCK(sr_index_lock); 104 105 /* This semaphore is used to mediate the 0->1 reference get in the 106 * face of object destruction (i.e. we can't allow a get on an 107 * object after last put) */ 108 static DEFINE_MUTEX(sr_ref_mutex); 109 110 static int sr_open(struct cdrom_device_info *, int); 111 static void sr_release(struct cdrom_device_info *); 112 113 static void get_sectorsize(struct scsi_cd *); 114 static void get_capabilities(struct scsi_cd *); 115 116 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 117 unsigned int clearing, int slot); 118 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 119 120 static const struct cdrom_device_ops sr_dops = { 121 .open = sr_open, 122 .release = sr_release, 123 .drive_status = sr_drive_status, 124 .check_events = sr_check_events, 125 .tray_move = sr_tray_move, 126 .lock_door = sr_lock_door, 127 .select_speed = sr_select_speed, 128 .get_last_session = sr_get_last_session, 129 .get_mcn = sr_get_mcn, 130 .reset = sr_reset, 131 .audio_ioctl = sr_audio_ioctl, 132 .capability = SR_CAPABILITIES, 133 .generic_packet = sr_packet, 134 }; 135 136 static void sr_kref_release(struct kref *kref); 137 138 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 139 { 140 return container_of(disk->private_data, struct scsi_cd, driver); 141 } 142 143 static int sr_runtime_suspend(struct device *dev) 144 { 145 struct scsi_cd *cd = dev_get_drvdata(dev); 146 147 if (!cd) /* E.g.: runtime suspend following sr_remove() */ 148 return 0; 149 150 if (cd->media_present) 151 return -EBUSY; 152 else 153 return 0; 154 } 155 156 /* 157 * The get and put routines for the struct scsi_cd. Note this entity 158 * has a scsi_device pointer and owns a reference to this. 159 */ 160 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 161 { 162 struct scsi_cd *cd = NULL; 163 164 mutex_lock(&sr_ref_mutex); 165 if (disk->private_data == NULL) 166 goto out; 167 cd = scsi_cd(disk); 168 kref_get(&cd->kref); 169 if (scsi_device_get(cd->device)) { 170 kref_put(&cd->kref, sr_kref_release); 171 cd = NULL; 172 } 173 out: 174 mutex_unlock(&sr_ref_mutex); 175 return cd; 176 } 177 178 static void scsi_cd_put(struct scsi_cd *cd) 179 { 180 struct scsi_device *sdev = cd->device; 181 182 mutex_lock(&sr_ref_mutex); 183 kref_put(&cd->kref, sr_kref_release); 184 scsi_device_put(sdev); 185 mutex_unlock(&sr_ref_mutex); 186 } 187 188 static unsigned int sr_get_events(struct scsi_device *sdev) 189 { 190 u8 buf[8]; 191 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 192 1, /* polled */ 193 0, 0, /* reserved */ 194 1 << 4, /* notification class: media */ 195 0, 0, /* reserved */ 196 0, sizeof(buf), /* allocation length */ 197 0, /* control */ 198 }; 199 struct event_header *eh = (void *)buf; 200 struct media_event_desc *med = (void *)(buf + 4); 201 struct scsi_sense_hdr sshdr; 202 int result; 203 204 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 205 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 206 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 207 return DISK_EVENT_MEDIA_CHANGE; 208 209 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 210 return 0; 211 212 if (eh->nea || eh->notification_class != 0x4) 213 return 0; 214 215 if (med->media_event_code == 1) 216 return DISK_EVENT_EJECT_REQUEST; 217 else if (med->media_event_code == 2) 218 return DISK_EVENT_MEDIA_CHANGE; 219 return 0; 220 } 221 222 /* 223 * This function checks to see if the media has been changed or eject 224 * button has been pressed. It is possible that we have already 225 * sensed a change, or the drive may have sensed one and not yet 226 * reported it. The past events are accumulated in sdev->changed and 227 * returned together with the current state. 228 */ 229 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 230 unsigned int clearing, int slot) 231 { 232 struct scsi_cd *cd = cdi->handle; 233 bool last_present; 234 struct scsi_sense_hdr sshdr; 235 unsigned int events; 236 int ret; 237 238 /* no changer support */ 239 if (CDSL_CURRENT != slot) 240 return 0; 241 242 events = sr_get_events(cd->device); 243 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 244 245 /* 246 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 247 * for several times in a row. We rely on TUR only for this likely 248 * broken device, to prevent generating incorrect media changed 249 * events for every open(). 250 */ 251 if (cd->ignore_get_event) { 252 events &= ~DISK_EVENT_MEDIA_CHANGE; 253 goto do_tur; 254 } 255 256 /* 257 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 258 * is being cleared. Note that there are devices which hang 259 * if asked to execute TUR repeatedly. 260 */ 261 if (cd->device->changed) { 262 events |= DISK_EVENT_MEDIA_CHANGE; 263 cd->device->changed = 0; 264 cd->tur_changed = true; 265 } 266 267 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 268 return events; 269 do_tur: 270 /* let's see whether the media is there with TUR */ 271 last_present = cd->media_present; 272 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 273 274 /* 275 * Media is considered to be present if TUR succeeds or fails with 276 * sense data indicating something other than media-not-present 277 * (ASC 0x3a). 278 */ 279 cd->media_present = scsi_status_is_good(ret) || 280 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 281 282 if (last_present != cd->media_present) 283 cd->device->changed = 1; 284 285 if (cd->device->changed) { 286 events |= DISK_EVENT_MEDIA_CHANGE; 287 cd->device->changed = 0; 288 cd->tur_changed = true; 289 } 290 291 if (cd->ignore_get_event) 292 return events; 293 294 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 295 if (!cd->tur_changed) { 296 if (cd->get_event_changed) { 297 if (cd->tur_mismatch++ > 8) { 298 sr_printk(KERN_WARNING, cd, 299 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 300 cd->ignore_get_event = true; 301 } 302 } else { 303 cd->tur_mismatch = 0; 304 } 305 } 306 cd->tur_changed = false; 307 cd->get_event_changed = false; 308 309 return events; 310 } 311 312 /* 313 * sr_done is the interrupt routine for the device driver. 314 * 315 * It will be notified on the end of a SCSI read / write, and will take one 316 * of several actions based on success or failure. 317 */ 318 static int sr_done(struct scsi_cmnd *SCpnt) 319 { 320 int result = SCpnt->result; 321 int this_count = scsi_bufflen(SCpnt); 322 int good_bytes = (result == 0 ? this_count : 0); 323 int block_sectors = 0; 324 long error_sector; 325 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 326 327 #ifdef DEBUG 328 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 329 #endif 330 331 /* 332 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 333 * success. Since this is a relatively rare error condition, no 334 * care is taken to avoid unnecessary additional work such as 335 * memcpy's that could be avoided. 336 */ 337 if (driver_byte(result) != 0 && /* An error occurred */ 338 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 339 switch (SCpnt->sense_buffer[2]) { 340 case MEDIUM_ERROR: 341 case VOLUME_OVERFLOW: 342 case ILLEGAL_REQUEST: 343 if (!(SCpnt->sense_buffer[0] & 0x90)) 344 break; 345 error_sector = (SCpnt->sense_buffer[3] << 24) | 346 (SCpnt->sense_buffer[4] << 16) | 347 (SCpnt->sense_buffer[5] << 8) | 348 SCpnt->sense_buffer[6]; 349 if (SCpnt->request->bio != NULL) 350 block_sectors = 351 bio_sectors(SCpnt->request->bio); 352 if (block_sectors < 4) 353 block_sectors = 4; 354 if (cd->device->sector_size == 2048) 355 error_sector <<= 2; 356 error_sector &= ~(block_sectors - 1); 357 good_bytes = (error_sector - 358 blk_rq_pos(SCpnt->request)) << 9; 359 if (good_bytes < 0 || good_bytes >= this_count) 360 good_bytes = 0; 361 /* 362 * The SCSI specification allows for the value 363 * returned by READ CAPACITY to be up to 75 2K 364 * sectors past the last readable block. 365 * Therefore, if we hit a medium error within the 366 * last 75 2K sectors, we decrease the saved size 367 * value. 368 */ 369 if (error_sector < get_capacity(cd->disk) && 370 cd->capacity - error_sector < 4 * 75) 371 set_capacity(cd->disk, error_sector); 372 break; 373 374 case RECOVERED_ERROR: 375 good_bytes = this_count; 376 break; 377 378 default: 379 break; 380 } 381 } 382 383 return good_bytes; 384 } 385 386 static int sr_init_command(struct scsi_cmnd *SCpnt) 387 { 388 int block = 0, this_count, s_size; 389 struct scsi_cd *cd; 390 struct request *rq = SCpnt->request; 391 int ret; 392 393 ret = scsi_init_io(SCpnt); 394 if (ret != BLKPREP_OK) 395 goto out; 396 WARN_ON_ONCE(SCpnt != rq->special); 397 cd = scsi_cd(rq->rq_disk); 398 399 /* from here on until we're complete, any goto out 400 * is used for a killable error condition */ 401 ret = BLKPREP_KILL; 402 403 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 404 "Doing sr request, block = %d\n", block)); 405 406 if (!cd->device || !scsi_device_online(cd->device)) { 407 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 408 "Finishing %u sectors\n", blk_rq_sectors(rq))); 409 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 410 "Retry with 0x%p\n", SCpnt)); 411 goto out; 412 } 413 414 if (cd->device->changed) { 415 /* 416 * quietly refuse to do anything to a changed disc until the 417 * changed bit has been reset 418 */ 419 goto out; 420 } 421 422 /* 423 * we do lazy blocksize switching (when reading XA sectors, 424 * see CDROMREADMODE2 ioctl) 425 */ 426 s_size = cd->device->sector_size; 427 if (s_size > 2048) { 428 if (!in_interrupt()) 429 sr_set_blocklength(cd, 2048); 430 else 431 scmd_printk(KERN_INFO, SCpnt, 432 "can't switch blocksize: in interrupt\n"); 433 } 434 435 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 436 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 437 goto out; 438 } 439 440 switch (req_op(rq)) { 441 case REQ_OP_WRITE: 442 if (!cd->writeable) 443 goto out; 444 SCpnt->cmnd[0] = WRITE_10; 445 cd->cdi.media_written = 1; 446 break; 447 case REQ_OP_READ: 448 SCpnt->cmnd[0] = READ_10; 449 break; 450 default: 451 blk_dump_rq_flags(rq, "Unknown sr command"); 452 goto out; 453 } 454 455 { 456 struct scatterlist *sg; 457 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 458 459 scsi_for_each_sg(SCpnt, sg, sg_count, i) 460 size += sg->length; 461 462 if (size != scsi_bufflen(SCpnt)) { 463 scmd_printk(KERN_ERR, SCpnt, 464 "mismatch count %d, bytes %d\n", 465 size, scsi_bufflen(SCpnt)); 466 if (scsi_bufflen(SCpnt) > size) 467 SCpnt->sdb.length = size; 468 } 469 } 470 471 /* 472 * request doesn't start on hw block boundary, add scatter pads 473 */ 474 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 475 (scsi_bufflen(SCpnt) % s_size)) { 476 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 477 goto out; 478 } 479 480 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 481 482 483 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 484 "%s %d/%u 512 byte blocks.\n", 485 (rq_data_dir(rq) == WRITE) ? 486 "writing" : "reading", 487 this_count, blk_rq_sectors(rq))); 488 489 SCpnt->cmnd[1] = 0; 490 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 491 492 if (this_count > 0xffff) { 493 this_count = 0xffff; 494 SCpnt->sdb.length = this_count * s_size; 495 } 496 497 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 498 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 499 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 500 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 501 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 502 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 503 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 504 505 /* 506 * We shouldn't disconnect in the middle of a sector, so with a dumb 507 * host adapter, it's safe to assume that we can at least transfer 508 * this many bytes between each connect / disconnect. 509 */ 510 SCpnt->transfersize = cd->device->sector_size; 511 SCpnt->underflow = this_count << 9; 512 SCpnt->allowed = MAX_RETRIES; 513 514 /* 515 * This indicates that the command is ready from our end to be 516 * queued. 517 */ 518 ret = BLKPREP_OK; 519 out: 520 return ret; 521 } 522 523 static int sr_block_open(struct block_device *bdev, fmode_t mode) 524 { 525 struct scsi_cd *cd; 526 int ret = -ENXIO; 527 528 check_disk_change(bdev); 529 530 mutex_lock(&sr_mutex); 531 cd = scsi_cd_get(bdev->bd_disk); 532 if (cd) { 533 ret = cdrom_open(&cd->cdi, bdev, mode); 534 if (ret) 535 scsi_cd_put(cd); 536 } 537 mutex_unlock(&sr_mutex); 538 return ret; 539 } 540 541 static void sr_block_release(struct gendisk *disk, fmode_t mode) 542 { 543 struct scsi_cd *cd = scsi_cd(disk); 544 mutex_lock(&sr_mutex); 545 cdrom_release(&cd->cdi, mode); 546 scsi_cd_put(cd); 547 mutex_unlock(&sr_mutex); 548 } 549 550 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 551 unsigned long arg) 552 { 553 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 554 struct scsi_device *sdev = cd->device; 555 void __user *argp = (void __user *)arg; 556 int ret; 557 558 mutex_lock(&sr_mutex); 559 560 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 561 (mode & FMODE_NDELAY) != 0); 562 if (ret) 563 goto out; 564 565 /* 566 * Send SCSI addressing ioctls directly to mid level, send other 567 * ioctls to cdrom/block level. 568 */ 569 switch (cmd) { 570 case SCSI_IOCTL_GET_IDLUN: 571 case SCSI_IOCTL_GET_BUS_NUMBER: 572 ret = scsi_ioctl(sdev, cmd, argp); 573 goto out; 574 } 575 576 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 577 if (ret != -ENOSYS) 578 goto out; 579 580 ret = scsi_ioctl(sdev, cmd, argp); 581 582 out: 583 mutex_unlock(&sr_mutex); 584 return ret; 585 } 586 587 static unsigned int sr_block_check_events(struct gendisk *disk, 588 unsigned int clearing) 589 { 590 unsigned int ret = 0; 591 struct scsi_cd *cd; 592 593 cd = scsi_cd_get(disk); 594 if (!cd) 595 return 0; 596 597 if (!atomic_read(&cd->device->disk_events_disable_depth)) 598 ret = cdrom_check_events(&cd->cdi, clearing); 599 600 scsi_cd_put(cd); 601 return ret; 602 } 603 604 static int sr_block_revalidate_disk(struct gendisk *disk) 605 { 606 struct scsi_sense_hdr sshdr; 607 struct scsi_cd *cd; 608 609 cd = scsi_cd_get(disk); 610 if (!cd) 611 return -ENXIO; 612 613 /* if the unit is not ready, nothing more to do */ 614 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 615 goto out; 616 617 sr_cd_check(&cd->cdi); 618 get_sectorsize(cd); 619 out: 620 scsi_cd_put(cd); 621 return 0; 622 } 623 624 static const struct block_device_operations sr_bdops = 625 { 626 .owner = THIS_MODULE, 627 .open = sr_block_open, 628 .release = sr_block_release, 629 .ioctl = sr_block_ioctl, 630 .check_events = sr_block_check_events, 631 .revalidate_disk = sr_block_revalidate_disk, 632 /* 633 * No compat_ioctl for now because sr_block_ioctl never 634 * seems to pass arbitrary ioctls down to host drivers. 635 */ 636 }; 637 638 static int sr_open(struct cdrom_device_info *cdi, int purpose) 639 { 640 struct scsi_cd *cd = cdi->handle; 641 struct scsi_device *sdev = cd->device; 642 int retval; 643 644 /* 645 * If the device is in error recovery, wait until it is done. 646 * If the device is offline, then disallow any access to it. 647 */ 648 retval = -ENXIO; 649 if (!scsi_block_when_processing_errors(sdev)) 650 goto error_out; 651 652 return 0; 653 654 error_out: 655 return retval; 656 } 657 658 static void sr_release(struct cdrom_device_info *cdi) 659 { 660 struct scsi_cd *cd = cdi->handle; 661 662 if (cd->device->sector_size > 2048) 663 sr_set_blocklength(cd, 2048); 664 665 } 666 667 static int sr_probe(struct device *dev) 668 { 669 struct scsi_device *sdev = to_scsi_device(dev); 670 struct gendisk *disk; 671 struct scsi_cd *cd; 672 int minor, error; 673 674 scsi_autopm_get_device(sdev); 675 error = -ENODEV; 676 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 677 goto fail; 678 679 error = -ENOMEM; 680 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 681 if (!cd) 682 goto fail; 683 684 kref_init(&cd->kref); 685 686 disk = alloc_disk(1); 687 if (!disk) 688 goto fail_free; 689 690 spin_lock(&sr_index_lock); 691 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 692 if (minor == SR_DISKS) { 693 spin_unlock(&sr_index_lock); 694 error = -EBUSY; 695 goto fail_put; 696 } 697 __set_bit(minor, sr_index_bits); 698 spin_unlock(&sr_index_lock); 699 700 disk->major = SCSI_CDROM_MAJOR; 701 disk->first_minor = minor; 702 sprintf(disk->disk_name, "sr%d", minor); 703 disk->fops = &sr_bdops; 704 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 705 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 706 707 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 708 709 cd->device = sdev; 710 cd->disk = disk; 711 cd->driver = &sr_template; 712 cd->disk = disk; 713 cd->capacity = 0x1fffff; 714 cd->device->changed = 1; /* force recheck CD type */ 715 cd->media_present = 1; 716 cd->use = 1; 717 cd->readcd_known = 0; 718 cd->readcd_cdda = 0; 719 720 cd->cdi.ops = &sr_dops; 721 cd->cdi.handle = cd; 722 cd->cdi.mask = 0; 723 cd->cdi.capacity = 1; 724 sprintf(cd->cdi.name, "sr%d", minor); 725 726 sdev->sector_size = 2048; /* A guess, just in case */ 727 728 /* FIXME: need to handle a get_capabilities failure properly ?? */ 729 get_capabilities(cd); 730 sr_vendor_init(cd); 731 732 set_capacity(disk, cd->capacity); 733 disk->private_data = &cd->driver; 734 disk->queue = sdev->request_queue; 735 cd->cdi.disk = disk; 736 737 if (register_cdrom(&cd->cdi)) 738 goto fail_put; 739 740 /* 741 * Initialize block layer runtime PM stuffs before the 742 * periodic event checking request gets started in add_disk. 743 */ 744 blk_pm_runtime_init(sdev->request_queue, dev); 745 746 dev_set_drvdata(dev, cd); 747 disk->flags |= GENHD_FL_REMOVABLE; 748 device_add_disk(&sdev->sdev_gendev, disk); 749 750 sdev_printk(KERN_DEBUG, sdev, 751 "Attached scsi CD-ROM %s\n", cd->cdi.name); 752 scsi_autopm_put_device(cd->device); 753 754 return 0; 755 756 fail_put: 757 put_disk(disk); 758 fail_free: 759 kfree(cd); 760 fail: 761 scsi_autopm_put_device(sdev); 762 return error; 763 } 764 765 766 static void get_sectorsize(struct scsi_cd *cd) 767 { 768 unsigned char cmd[10]; 769 unsigned char buffer[8]; 770 int the_result, retries = 3; 771 int sector_size; 772 struct request_queue *queue; 773 774 do { 775 cmd[0] = READ_CAPACITY; 776 memset((void *) &cmd[1], 0, 9); 777 memset(buffer, 0, sizeof(buffer)); 778 779 /* Do the command and wait.. */ 780 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 781 buffer, sizeof(buffer), NULL, 782 SR_TIMEOUT, MAX_RETRIES, NULL); 783 784 retries--; 785 786 } while (the_result && retries); 787 788 789 if (the_result) { 790 cd->capacity = 0x1fffff; 791 sector_size = 2048; /* A guess, just in case */ 792 } else { 793 long last_written; 794 795 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | 796 (buffer[2] << 8) | buffer[3]); 797 /* 798 * READ_CAPACITY doesn't return the correct size on 799 * certain UDF media. If last_written is larger, use 800 * it instead. 801 * 802 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 803 */ 804 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 805 cd->capacity = max_t(long, cd->capacity, last_written); 806 807 sector_size = (buffer[4] << 24) | 808 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 809 switch (sector_size) { 810 /* 811 * HP 4020i CD-Recorder reports 2340 byte sectors 812 * Philips CD-Writers report 2352 byte sectors 813 * 814 * Use 2k sectors for them.. 815 */ 816 case 0: 817 case 2340: 818 case 2352: 819 sector_size = 2048; 820 /* fall through */ 821 case 2048: 822 cd->capacity *= 4; 823 /* fall through */ 824 case 512: 825 break; 826 default: 827 sr_printk(KERN_INFO, cd, 828 "unsupported sector size %d.", sector_size); 829 cd->capacity = 0; 830 } 831 832 cd->device->sector_size = sector_size; 833 834 /* 835 * Add this so that we have the ability to correctly gauge 836 * what the device is capable of. 837 */ 838 set_capacity(cd->disk, cd->capacity); 839 } 840 841 queue = cd->device->request_queue; 842 blk_queue_logical_block_size(queue, sector_size); 843 844 return; 845 } 846 847 static void get_capabilities(struct scsi_cd *cd) 848 { 849 unsigned char *buffer; 850 struct scsi_mode_data data; 851 struct scsi_sense_hdr sshdr; 852 unsigned int ms_len = 128; 853 int rc, n; 854 855 static const char *loadmech[] = 856 { 857 "caddy", 858 "tray", 859 "pop-up", 860 "", 861 "changer", 862 "cartridge changer", 863 "", 864 "" 865 }; 866 867 868 /* allocate transfer buffer */ 869 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 870 if (!buffer) { 871 sr_printk(KERN_ERR, cd, "out of memory.\n"); 872 return; 873 } 874 875 /* eat unit attentions */ 876 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 877 878 /* ask for mode page 0x2a */ 879 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 880 SR_TIMEOUT, 3, &data, NULL); 881 882 if (!scsi_status_is_good(rc) || data.length > ms_len || 883 data.header_length + data.block_descriptor_length > data.length) { 884 /* failed, drive doesn't have capabilities mode page */ 885 cd->cdi.speed = 1; 886 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 887 CDC_DVD | CDC_DVD_RAM | 888 CDC_SELECT_DISC | CDC_SELECT_SPEED | 889 CDC_MRW | CDC_MRW_W | CDC_RAM); 890 kfree(buffer); 891 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 892 return; 893 } 894 895 n = data.header_length + data.block_descriptor_length; 896 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 897 cd->readcd_known = 1; 898 cd->readcd_cdda = buffer[n + 5] & 0x01; 899 /* print some capability bits */ 900 sr_printk(KERN_INFO, cd, 901 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 902 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 903 cd->cdi.speed, 904 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 905 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 906 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 907 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 908 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 909 loadmech[buffer[n + 6] >> 5]); 910 if ((buffer[n + 6] >> 5) == 0) 911 /* caddy drives can't close tray... */ 912 cd->cdi.mask |= CDC_CLOSE_TRAY; 913 if ((buffer[n + 2] & 0x8) == 0) 914 /* not a DVD drive */ 915 cd->cdi.mask |= CDC_DVD; 916 if ((buffer[n + 3] & 0x20) == 0) 917 /* can't write DVD-RAM media */ 918 cd->cdi.mask |= CDC_DVD_RAM; 919 if ((buffer[n + 3] & 0x10) == 0) 920 /* can't write DVD-R media */ 921 cd->cdi.mask |= CDC_DVD_R; 922 if ((buffer[n + 3] & 0x2) == 0) 923 /* can't write CD-RW media */ 924 cd->cdi.mask |= CDC_CD_RW; 925 if ((buffer[n + 3] & 0x1) == 0) 926 /* can't write CD-R media */ 927 cd->cdi.mask |= CDC_CD_R; 928 if ((buffer[n + 6] & 0x8) == 0) 929 /* can't eject */ 930 cd->cdi.mask |= CDC_OPEN_TRAY; 931 932 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 933 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 934 cd->cdi.capacity = 935 cdrom_number_of_slots(&cd->cdi); 936 if (cd->cdi.capacity <= 1) 937 /* not a changer */ 938 cd->cdi.mask |= CDC_SELECT_DISC; 939 /*else I don't think it can close its tray 940 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 941 942 /* 943 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 944 */ 945 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 946 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 947 cd->writeable = 1; 948 } 949 950 kfree(buffer); 951 } 952 953 /* 954 * sr_packet() is the entry point for the generic commands generated 955 * by the Uniform CD-ROM layer. 956 */ 957 static int sr_packet(struct cdrom_device_info *cdi, 958 struct packet_command *cgc) 959 { 960 struct scsi_cd *cd = cdi->handle; 961 struct scsi_device *sdev = cd->device; 962 963 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 964 return -EDRIVE_CANT_DO_THIS; 965 966 if (cgc->timeout <= 0) 967 cgc->timeout = IOCTL_TIMEOUT; 968 969 sr_do_ioctl(cd, cgc); 970 971 return cgc->stat; 972 } 973 974 /** 975 * sr_kref_release - Called to free the scsi_cd structure 976 * @kref: pointer to embedded kref 977 * 978 * sr_ref_mutex must be held entering this routine. Because it is 979 * called on last put, you should always use the scsi_cd_get() 980 * scsi_cd_put() helpers which manipulate the semaphore directly 981 * and never do a direct kref_put(). 982 **/ 983 static void sr_kref_release(struct kref *kref) 984 { 985 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 986 struct gendisk *disk = cd->disk; 987 988 spin_lock(&sr_index_lock); 989 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 990 spin_unlock(&sr_index_lock); 991 992 unregister_cdrom(&cd->cdi); 993 994 disk->private_data = NULL; 995 996 put_disk(disk); 997 998 kfree(cd); 999 } 1000 1001 static int sr_remove(struct device *dev) 1002 { 1003 struct scsi_cd *cd = dev_get_drvdata(dev); 1004 1005 scsi_autopm_get_device(cd->device); 1006 1007 del_gendisk(cd->disk); 1008 dev_set_drvdata(dev, NULL); 1009 1010 mutex_lock(&sr_ref_mutex); 1011 kref_put(&cd->kref, sr_kref_release); 1012 mutex_unlock(&sr_ref_mutex); 1013 1014 return 0; 1015 } 1016 1017 static int __init init_sr(void) 1018 { 1019 int rc; 1020 1021 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1022 if (rc) 1023 return rc; 1024 rc = scsi_register_driver(&sr_template.gendrv); 1025 if (rc) 1026 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1027 1028 return rc; 1029 } 1030 1031 static void __exit exit_sr(void) 1032 { 1033 scsi_unregister_driver(&sr_template.gendrv); 1034 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1035 } 1036 1037 module_init(init_sr); 1038 module_exit(exit_sr); 1039 MODULE_LICENSE("GPL"); 1040