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 mutex_lock(&sr_mutex); 529 cd = scsi_cd_get(bdev->bd_disk); 530 if (cd) { 531 ret = cdrom_open(&cd->cdi, bdev, mode); 532 if (ret) 533 scsi_cd_put(cd); 534 } 535 mutex_unlock(&sr_mutex); 536 return ret; 537 } 538 539 static void sr_block_release(struct gendisk *disk, fmode_t mode) 540 { 541 struct scsi_cd *cd = scsi_cd(disk); 542 mutex_lock(&sr_mutex); 543 cdrom_release(&cd->cdi, mode); 544 scsi_cd_put(cd); 545 mutex_unlock(&sr_mutex); 546 } 547 548 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 549 unsigned long arg) 550 { 551 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 552 struct scsi_device *sdev = cd->device; 553 void __user *argp = (void __user *)arg; 554 int ret; 555 556 mutex_lock(&sr_mutex); 557 558 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 559 (mode & FMODE_NDELAY) != 0); 560 if (ret) 561 goto out; 562 563 /* 564 * Send SCSI addressing ioctls directly to mid level, send other 565 * ioctls to cdrom/block level. 566 */ 567 switch (cmd) { 568 case SCSI_IOCTL_GET_IDLUN: 569 case SCSI_IOCTL_GET_BUS_NUMBER: 570 ret = scsi_ioctl(sdev, cmd, argp); 571 goto out; 572 } 573 574 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 575 if (ret != -ENOSYS) 576 goto out; 577 578 ret = scsi_ioctl(sdev, cmd, argp); 579 580 out: 581 mutex_unlock(&sr_mutex); 582 return ret; 583 } 584 585 static unsigned int sr_block_check_events(struct gendisk *disk, 586 unsigned int clearing) 587 { 588 struct scsi_cd *cd = scsi_cd(disk); 589 590 if (atomic_read(&cd->device->disk_events_disable_depth)) 591 return 0; 592 593 return cdrom_check_events(&cd->cdi, clearing); 594 } 595 596 static int sr_block_revalidate_disk(struct gendisk *disk) 597 { 598 struct scsi_cd *cd = scsi_cd(disk); 599 struct scsi_sense_hdr sshdr; 600 601 /* if the unit is not ready, nothing more to do */ 602 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 603 goto out; 604 605 sr_cd_check(&cd->cdi); 606 get_sectorsize(cd); 607 out: 608 return 0; 609 } 610 611 static const struct block_device_operations sr_bdops = 612 { 613 .owner = THIS_MODULE, 614 .open = sr_block_open, 615 .release = sr_block_release, 616 .ioctl = sr_block_ioctl, 617 .check_events = sr_block_check_events, 618 .revalidate_disk = sr_block_revalidate_disk, 619 /* 620 * No compat_ioctl for now because sr_block_ioctl never 621 * seems to pass arbitrary ioctls down to host drivers. 622 */ 623 }; 624 625 static int sr_open(struct cdrom_device_info *cdi, int purpose) 626 { 627 struct scsi_cd *cd = cdi->handle; 628 struct scsi_device *sdev = cd->device; 629 int retval; 630 631 /* 632 * If the device is in error recovery, wait until it is done. 633 * If the device is offline, then disallow any access to it. 634 */ 635 retval = -ENXIO; 636 if (!scsi_block_when_processing_errors(sdev)) 637 goto error_out; 638 639 return 0; 640 641 error_out: 642 return retval; 643 } 644 645 static void sr_release(struct cdrom_device_info *cdi) 646 { 647 struct scsi_cd *cd = cdi->handle; 648 649 if (cd->device->sector_size > 2048) 650 sr_set_blocklength(cd, 2048); 651 652 } 653 654 static int sr_probe(struct device *dev) 655 { 656 struct scsi_device *sdev = to_scsi_device(dev); 657 struct gendisk *disk; 658 struct scsi_cd *cd; 659 int minor, error; 660 661 scsi_autopm_get_device(sdev); 662 error = -ENODEV; 663 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 664 goto fail; 665 666 error = -ENOMEM; 667 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 668 if (!cd) 669 goto fail; 670 671 kref_init(&cd->kref); 672 673 disk = alloc_disk(1); 674 if (!disk) 675 goto fail_free; 676 677 spin_lock(&sr_index_lock); 678 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 679 if (minor == SR_DISKS) { 680 spin_unlock(&sr_index_lock); 681 error = -EBUSY; 682 goto fail_put; 683 } 684 __set_bit(minor, sr_index_bits); 685 spin_unlock(&sr_index_lock); 686 687 disk->major = SCSI_CDROM_MAJOR; 688 disk->first_minor = minor; 689 sprintf(disk->disk_name, "sr%d", minor); 690 disk->fops = &sr_bdops; 691 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 692 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 693 694 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 695 696 cd->device = sdev; 697 cd->disk = disk; 698 cd->driver = &sr_template; 699 cd->disk = disk; 700 cd->capacity = 0x1fffff; 701 cd->device->changed = 1; /* force recheck CD type */ 702 cd->media_present = 1; 703 cd->use = 1; 704 cd->readcd_known = 0; 705 cd->readcd_cdda = 0; 706 707 cd->cdi.ops = &sr_dops; 708 cd->cdi.handle = cd; 709 cd->cdi.mask = 0; 710 cd->cdi.capacity = 1; 711 sprintf(cd->cdi.name, "sr%d", minor); 712 713 sdev->sector_size = 2048; /* A guess, just in case */ 714 715 /* FIXME: need to handle a get_capabilities failure properly ?? */ 716 get_capabilities(cd); 717 sr_vendor_init(cd); 718 719 set_capacity(disk, cd->capacity); 720 disk->private_data = &cd->driver; 721 disk->queue = sdev->request_queue; 722 cd->cdi.disk = disk; 723 724 if (register_cdrom(&cd->cdi)) 725 goto fail_put; 726 727 /* 728 * Initialize block layer runtime PM stuffs before the 729 * periodic event checking request gets started in add_disk. 730 */ 731 blk_pm_runtime_init(sdev->request_queue, dev); 732 733 dev_set_drvdata(dev, cd); 734 disk->flags |= GENHD_FL_REMOVABLE; 735 device_add_disk(&sdev->sdev_gendev, disk); 736 737 sdev_printk(KERN_DEBUG, sdev, 738 "Attached scsi CD-ROM %s\n", cd->cdi.name); 739 scsi_autopm_put_device(cd->device); 740 741 return 0; 742 743 fail_put: 744 put_disk(disk); 745 fail_free: 746 kfree(cd); 747 fail: 748 scsi_autopm_put_device(sdev); 749 return error; 750 } 751 752 753 static void get_sectorsize(struct scsi_cd *cd) 754 { 755 unsigned char cmd[10]; 756 unsigned char buffer[8]; 757 int the_result, retries = 3; 758 int sector_size; 759 struct request_queue *queue; 760 761 do { 762 cmd[0] = READ_CAPACITY; 763 memset((void *) &cmd[1], 0, 9); 764 memset(buffer, 0, sizeof(buffer)); 765 766 /* Do the command and wait.. */ 767 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 768 buffer, sizeof(buffer), NULL, 769 SR_TIMEOUT, MAX_RETRIES, NULL); 770 771 retries--; 772 773 } while (the_result && retries); 774 775 776 if (the_result) { 777 cd->capacity = 0x1fffff; 778 sector_size = 2048; /* A guess, just in case */ 779 } else { 780 long last_written; 781 782 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | 783 (buffer[2] << 8) | buffer[3]); 784 /* 785 * READ_CAPACITY doesn't return the correct size on 786 * certain UDF media. If last_written is larger, use 787 * it instead. 788 * 789 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 790 */ 791 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 792 cd->capacity = max_t(long, cd->capacity, last_written); 793 794 sector_size = (buffer[4] << 24) | 795 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 796 switch (sector_size) { 797 /* 798 * HP 4020i CD-Recorder reports 2340 byte sectors 799 * Philips CD-Writers report 2352 byte sectors 800 * 801 * Use 2k sectors for them.. 802 */ 803 case 0: 804 case 2340: 805 case 2352: 806 sector_size = 2048; 807 /* fall through */ 808 case 2048: 809 cd->capacity *= 4; 810 /* fall through */ 811 case 512: 812 break; 813 default: 814 sr_printk(KERN_INFO, cd, 815 "unsupported sector size %d.", sector_size); 816 cd->capacity = 0; 817 } 818 819 cd->device->sector_size = sector_size; 820 821 /* 822 * Add this so that we have the ability to correctly gauge 823 * what the device is capable of. 824 */ 825 set_capacity(cd->disk, cd->capacity); 826 } 827 828 queue = cd->device->request_queue; 829 blk_queue_logical_block_size(queue, sector_size); 830 831 return; 832 } 833 834 static void get_capabilities(struct scsi_cd *cd) 835 { 836 unsigned char *buffer; 837 struct scsi_mode_data data; 838 struct scsi_sense_hdr sshdr; 839 unsigned int ms_len = 128; 840 int rc, n; 841 842 static const char *loadmech[] = 843 { 844 "caddy", 845 "tray", 846 "pop-up", 847 "", 848 "changer", 849 "cartridge changer", 850 "", 851 "" 852 }; 853 854 855 /* allocate transfer buffer */ 856 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 857 if (!buffer) { 858 sr_printk(KERN_ERR, cd, "out of memory.\n"); 859 return; 860 } 861 862 /* eat unit attentions */ 863 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 864 865 /* ask for mode page 0x2a */ 866 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 867 SR_TIMEOUT, 3, &data, NULL); 868 869 if (!scsi_status_is_good(rc) || data.length > ms_len || 870 data.header_length + data.block_descriptor_length > data.length) { 871 /* failed, drive doesn't have capabilities mode page */ 872 cd->cdi.speed = 1; 873 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 874 CDC_DVD | CDC_DVD_RAM | 875 CDC_SELECT_DISC | CDC_SELECT_SPEED | 876 CDC_MRW | CDC_MRW_W | CDC_RAM); 877 kfree(buffer); 878 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 879 return; 880 } 881 882 n = data.header_length + data.block_descriptor_length; 883 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 884 cd->readcd_known = 1; 885 cd->readcd_cdda = buffer[n + 5] & 0x01; 886 /* print some capability bits */ 887 sr_printk(KERN_INFO, cd, 888 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 889 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 890 cd->cdi.speed, 891 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 892 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 893 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 894 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 895 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 896 loadmech[buffer[n + 6] >> 5]); 897 if ((buffer[n + 6] >> 5) == 0) 898 /* caddy drives can't close tray... */ 899 cd->cdi.mask |= CDC_CLOSE_TRAY; 900 if ((buffer[n + 2] & 0x8) == 0) 901 /* not a DVD drive */ 902 cd->cdi.mask |= CDC_DVD; 903 if ((buffer[n + 3] & 0x20) == 0) 904 /* can't write DVD-RAM media */ 905 cd->cdi.mask |= CDC_DVD_RAM; 906 if ((buffer[n + 3] & 0x10) == 0) 907 /* can't write DVD-R media */ 908 cd->cdi.mask |= CDC_DVD_R; 909 if ((buffer[n + 3] & 0x2) == 0) 910 /* can't write CD-RW media */ 911 cd->cdi.mask |= CDC_CD_RW; 912 if ((buffer[n + 3] & 0x1) == 0) 913 /* can't write CD-R media */ 914 cd->cdi.mask |= CDC_CD_R; 915 if ((buffer[n + 6] & 0x8) == 0) 916 /* can't eject */ 917 cd->cdi.mask |= CDC_OPEN_TRAY; 918 919 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 920 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 921 cd->cdi.capacity = 922 cdrom_number_of_slots(&cd->cdi); 923 if (cd->cdi.capacity <= 1) 924 /* not a changer */ 925 cd->cdi.mask |= CDC_SELECT_DISC; 926 /*else I don't think it can close its tray 927 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 928 929 /* 930 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 931 */ 932 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 933 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 934 cd->writeable = 1; 935 } 936 937 kfree(buffer); 938 } 939 940 /* 941 * sr_packet() is the entry point for the generic commands generated 942 * by the Uniform CD-ROM layer. 943 */ 944 static int sr_packet(struct cdrom_device_info *cdi, 945 struct packet_command *cgc) 946 { 947 struct scsi_cd *cd = cdi->handle; 948 struct scsi_device *sdev = cd->device; 949 950 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 951 return -EDRIVE_CANT_DO_THIS; 952 953 if (cgc->timeout <= 0) 954 cgc->timeout = IOCTL_TIMEOUT; 955 956 sr_do_ioctl(cd, cgc); 957 958 return cgc->stat; 959 } 960 961 /** 962 * sr_kref_release - Called to free the scsi_cd structure 963 * @kref: pointer to embedded kref 964 * 965 * sr_ref_mutex must be held entering this routine. Because it is 966 * called on last put, you should always use the scsi_cd_get() 967 * scsi_cd_put() helpers which manipulate the semaphore directly 968 * and never do a direct kref_put(). 969 **/ 970 static void sr_kref_release(struct kref *kref) 971 { 972 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 973 struct gendisk *disk = cd->disk; 974 975 spin_lock(&sr_index_lock); 976 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 977 spin_unlock(&sr_index_lock); 978 979 unregister_cdrom(&cd->cdi); 980 981 disk->private_data = NULL; 982 983 put_disk(disk); 984 985 kfree(cd); 986 } 987 988 static int sr_remove(struct device *dev) 989 { 990 struct scsi_cd *cd = dev_get_drvdata(dev); 991 992 scsi_autopm_get_device(cd->device); 993 994 del_gendisk(cd->disk); 995 dev_set_drvdata(dev, NULL); 996 997 mutex_lock(&sr_ref_mutex); 998 kref_put(&cd->kref, sr_kref_release); 999 mutex_unlock(&sr_ref_mutex); 1000 1001 return 0; 1002 } 1003 1004 static int __init init_sr(void) 1005 { 1006 int rc; 1007 1008 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1009 if (rc) 1010 return rc; 1011 rc = scsi_register_driver(&sr_template.gendrv); 1012 if (rc) 1013 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1014 1015 return rc; 1016 } 1017 1018 static void __exit exit_sr(void) 1019 { 1020 scsi_unregister_driver(&sr_template.gendrv); 1021 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1022 } 1023 1024 module_init(init_sr); 1025 module_exit(exit_sr); 1026 MODULE_LICENSE("GPL"); 1027