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 <asm/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 struct dev_pm_ops sr_pm_ops = { 87 .runtime_suspend = sr_runtime_suspend, 88 }; 89 90 static struct scsi_driver sr_template = { 91 .owner = THIS_MODULE, 92 .gendrv = { 93 .name = "sr", 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 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->media_present) 148 return -EBUSY; 149 else 150 return 0; 151 } 152 153 /* 154 * The get and put routines for the struct scsi_cd. Note this entity 155 * has a scsi_device pointer and owns a reference to this. 156 */ 157 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 158 { 159 struct scsi_cd *cd = NULL; 160 161 mutex_lock(&sr_ref_mutex); 162 if (disk->private_data == NULL) 163 goto out; 164 cd = scsi_cd(disk); 165 kref_get(&cd->kref); 166 if (scsi_device_get(cd->device)) { 167 kref_put(&cd->kref, sr_kref_release); 168 cd = NULL; 169 } 170 out: 171 mutex_unlock(&sr_ref_mutex); 172 return cd; 173 } 174 175 static void scsi_cd_put(struct scsi_cd *cd) 176 { 177 struct scsi_device *sdev = cd->device; 178 179 mutex_lock(&sr_ref_mutex); 180 kref_put(&cd->kref, sr_kref_release); 181 scsi_device_put(sdev); 182 mutex_unlock(&sr_ref_mutex); 183 } 184 185 static unsigned int sr_get_events(struct scsi_device *sdev) 186 { 187 u8 buf[8]; 188 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 189 1, /* polled */ 190 0, 0, /* reserved */ 191 1 << 4, /* notification class: media */ 192 0, 0, /* reserved */ 193 0, sizeof(buf), /* allocation length */ 194 0, /* control */ 195 }; 196 struct event_header *eh = (void *)buf; 197 struct media_event_desc *med = (void *)(buf + 4); 198 struct scsi_sense_hdr sshdr; 199 int result; 200 201 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 202 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 203 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 204 return DISK_EVENT_MEDIA_CHANGE; 205 206 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 207 return 0; 208 209 if (eh->nea || eh->notification_class != 0x4) 210 return 0; 211 212 if (med->media_event_code == 1) 213 return DISK_EVENT_EJECT_REQUEST; 214 else if (med->media_event_code == 2) 215 return DISK_EVENT_MEDIA_CHANGE; 216 return 0; 217 } 218 219 /* 220 * This function checks to see if the media has been changed or eject 221 * button has been pressed. It is possible that we have already 222 * sensed a change, or the drive may have sensed one and not yet 223 * reported it. The past events are accumulated in sdev->changed and 224 * returned together with the current state. 225 */ 226 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 227 unsigned int clearing, int slot) 228 { 229 struct scsi_cd *cd = cdi->handle; 230 bool last_present; 231 struct scsi_sense_hdr sshdr; 232 unsigned int events; 233 int ret; 234 235 /* no changer support */ 236 if (CDSL_CURRENT != slot) 237 return 0; 238 239 events = sr_get_events(cd->device); 240 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 241 242 /* 243 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 244 * for several times in a row. We rely on TUR only for this likely 245 * broken device, to prevent generating incorrect media changed 246 * events for every open(). 247 */ 248 if (cd->ignore_get_event) { 249 events &= ~DISK_EVENT_MEDIA_CHANGE; 250 goto do_tur; 251 } 252 253 /* 254 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 255 * is being cleared. Note that there are devices which hang 256 * if asked to execute TUR repeatedly. 257 */ 258 if (cd->device->changed) { 259 events |= DISK_EVENT_MEDIA_CHANGE; 260 cd->device->changed = 0; 261 cd->tur_changed = true; 262 } 263 264 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 265 return events; 266 do_tur: 267 /* let's see whether the media is there with TUR */ 268 last_present = cd->media_present; 269 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 270 271 /* 272 * Media is considered to be present if TUR succeeds or fails with 273 * sense data indicating something other than media-not-present 274 * (ASC 0x3a). 275 */ 276 cd->media_present = scsi_status_is_good(ret) || 277 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 278 279 if (last_present != cd->media_present) 280 cd->device->changed = 1; 281 282 if (cd->device->changed) { 283 events |= DISK_EVENT_MEDIA_CHANGE; 284 cd->device->changed = 0; 285 cd->tur_changed = true; 286 } 287 288 if (cd->ignore_get_event) 289 return events; 290 291 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 292 if (!cd->tur_changed) { 293 if (cd->get_event_changed) { 294 if (cd->tur_mismatch++ > 8) { 295 sr_printk(KERN_WARNING, cd, 296 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 297 cd->ignore_get_event = true; 298 } 299 } else { 300 cd->tur_mismatch = 0; 301 } 302 } 303 cd->tur_changed = false; 304 cd->get_event_changed = false; 305 306 return events; 307 } 308 309 /* 310 * sr_done is the interrupt routine for the device driver. 311 * 312 * It will be notified on the end of a SCSI read / write, and will take one 313 * of several actions based on success or failure. 314 */ 315 static int sr_done(struct scsi_cmnd *SCpnt) 316 { 317 int result = SCpnt->result; 318 int this_count = scsi_bufflen(SCpnt); 319 int good_bytes = (result == 0 ? this_count : 0); 320 int block_sectors = 0; 321 long error_sector; 322 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 323 324 #ifdef DEBUG 325 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 326 #endif 327 328 /* 329 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 330 * success. Since this is a relatively rare error condition, no 331 * care is taken to avoid unnecessary additional work such as 332 * memcpy's that could be avoided. 333 */ 334 if (driver_byte(result) != 0 && /* An error occurred */ 335 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 336 switch (SCpnt->sense_buffer[2]) { 337 case MEDIUM_ERROR: 338 case VOLUME_OVERFLOW: 339 case ILLEGAL_REQUEST: 340 if (!(SCpnt->sense_buffer[0] & 0x90)) 341 break; 342 error_sector = (SCpnt->sense_buffer[3] << 24) | 343 (SCpnt->sense_buffer[4] << 16) | 344 (SCpnt->sense_buffer[5] << 8) | 345 SCpnt->sense_buffer[6]; 346 if (SCpnt->request->bio != NULL) 347 block_sectors = 348 bio_sectors(SCpnt->request->bio); 349 if (block_sectors < 4) 350 block_sectors = 4; 351 if (cd->device->sector_size == 2048) 352 error_sector <<= 2; 353 error_sector &= ~(block_sectors - 1); 354 good_bytes = (error_sector - 355 blk_rq_pos(SCpnt->request)) << 9; 356 if (good_bytes < 0 || good_bytes >= this_count) 357 good_bytes = 0; 358 /* 359 * The SCSI specification allows for the value 360 * returned by READ CAPACITY to be up to 75 2K 361 * sectors past the last readable block. 362 * Therefore, if we hit a medium error within the 363 * last 75 2K sectors, we decrease the saved size 364 * value. 365 */ 366 if (error_sector < get_capacity(cd->disk) && 367 cd->capacity - error_sector < 4 * 75) 368 set_capacity(cd->disk, error_sector); 369 break; 370 371 case RECOVERED_ERROR: 372 good_bytes = this_count; 373 break; 374 375 default: 376 break; 377 } 378 } 379 380 return good_bytes; 381 } 382 383 static int sr_init_command(struct scsi_cmnd *SCpnt) 384 { 385 int block = 0, this_count, s_size; 386 struct scsi_cd *cd; 387 struct request *rq = SCpnt->request; 388 int ret; 389 390 ret = scsi_init_io(SCpnt, GFP_ATOMIC); 391 if (ret != BLKPREP_OK) 392 goto out; 393 SCpnt = rq->special; 394 cd = scsi_cd(rq->rq_disk); 395 396 /* from here on until we're complete, any goto out 397 * is used for a killable error condition */ 398 ret = BLKPREP_KILL; 399 400 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 401 "Doing sr request, block = %d\n", block)); 402 403 if (!cd->device || !scsi_device_online(cd->device)) { 404 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 405 "Finishing %u sectors\n", blk_rq_sectors(rq))); 406 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 407 "Retry with 0x%p\n", SCpnt)); 408 goto out; 409 } 410 411 if (cd->device->changed) { 412 /* 413 * quietly refuse to do anything to a changed disc until the 414 * changed bit has been reset 415 */ 416 goto out; 417 } 418 419 /* 420 * we do lazy blocksize switching (when reading XA sectors, 421 * see CDROMREADMODE2 ioctl) 422 */ 423 s_size = cd->device->sector_size; 424 if (s_size > 2048) { 425 if (!in_interrupt()) 426 sr_set_blocklength(cd, 2048); 427 else 428 scmd_printk(KERN_INFO, SCpnt, 429 "can't switch blocksize: in interrupt\n"); 430 } 431 432 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 433 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 434 goto out; 435 } 436 437 if (rq_data_dir(rq) == WRITE) { 438 if (!cd->writeable) 439 goto out; 440 SCpnt->cmnd[0] = WRITE_10; 441 cd->cdi.media_written = 1; 442 } else if (rq_data_dir(rq) == READ) { 443 SCpnt->cmnd[0] = READ_10; 444 } else { 445 blk_dump_rq_flags(rq, "Unknown sr command"); 446 goto out; 447 } 448 449 { 450 struct scatterlist *sg; 451 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 452 453 scsi_for_each_sg(SCpnt, sg, sg_count, i) 454 size += sg->length; 455 456 if (size != scsi_bufflen(SCpnt)) { 457 scmd_printk(KERN_ERR, SCpnt, 458 "mismatch count %d, bytes %d\n", 459 size, scsi_bufflen(SCpnt)); 460 if (scsi_bufflen(SCpnt) > size) 461 SCpnt->sdb.length = size; 462 } 463 } 464 465 /* 466 * request doesn't start on hw block boundary, add scatter pads 467 */ 468 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 469 (scsi_bufflen(SCpnt) % s_size)) { 470 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 471 goto out; 472 } 473 474 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 475 476 477 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 478 "%s %d/%u 512 byte blocks.\n", 479 (rq_data_dir(rq) == WRITE) ? 480 "writing" : "reading", 481 this_count, blk_rq_sectors(rq))); 482 483 SCpnt->cmnd[1] = 0; 484 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 485 486 if (this_count > 0xffff) { 487 this_count = 0xffff; 488 SCpnt->sdb.length = this_count * s_size; 489 } 490 491 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 492 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 493 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 494 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 495 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 496 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 497 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 498 499 /* 500 * We shouldn't disconnect in the middle of a sector, so with a dumb 501 * host adapter, it's safe to assume that we can at least transfer 502 * this many bytes between each connect / disconnect. 503 */ 504 SCpnt->transfersize = cd->device->sector_size; 505 SCpnt->underflow = this_count << 9; 506 SCpnt->allowed = MAX_RETRIES; 507 508 /* 509 * This indicates that the command is ready from our end to be 510 * queued. 511 */ 512 ret = BLKPREP_OK; 513 out: 514 return ret; 515 } 516 517 static int sr_block_open(struct block_device *bdev, fmode_t mode) 518 { 519 struct scsi_cd *cd; 520 int ret = -ENXIO; 521 522 mutex_lock(&sr_mutex); 523 cd = scsi_cd_get(bdev->bd_disk); 524 if (cd) { 525 ret = cdrom_open(&cd->cdi, bdev, mode); 526 if (ret) 527 scsi_cd_put(cd); 528 } 529 mutex_unlock(&sr_mutex); 530 return ret; 531 } 532 533 static void sr_block_release(struct gendisk *disk, fmode_t mode) 534 { 535 struct scsi_cd *cd = scsi_cd(disk); 536 mutex_lock(&sr_mutex); 537 cdrom_release(&cd->cdi, mode); 538 scsi_cd_put(cd); 539 mutex_unlock(&sr_mutex); 540 } 541 542 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 543 unsigned long arg) 544 { 545 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 546 struct scsi_device *sdev = cd->device; 547 void __user *argp = (void __user *)arg; 548 int ret; 549 550 mutex_lock(&sr_mutex); 551 552 /* 553 * Send SCSI addressing ioctls directly to mid level, send other 554 * ioctls to cdrom/block level. 555 */ 556 switch (cmd) { 557 case SCSI_IOCTL_GET_IDLUN: 558 case SCSI_IOCTL_GET_BUS_NUMBER: 559 ret = scsi_ioctl(sdev, cmd, argp); 560 goto out; 561 } 562 563 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 564 if (ret != -ENOSYS) 565 goto out; 566 567 /* 568 * ENODEV means that we didn't recognise the ioctl, or that we 569 * cannot execute it in the current device state. In either 570 * case fall through to scsi_ioctl, which will return ENDOEV again 571 * if it doesn't recognise the ioctl 572 */ 573 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, 574 (mode & FMODE_NDELAY) != 0); 575 if (ret != -ENODEV) 576 goto out; 577 ret = scsi_ioctl(sdev, cmd, argp); 578 579 out: 580 mutex_unlock(&sr_mutex); 581 return ret; 582 } 583 584 static unsigned int sr_block_check_events(struct gendisk *disk, 585 unsigned int clearing) 586 { 587 struct scsi_cd *cd = scsi_cd(disk); 588 589 if (atomic_read(&cd->device->disk_events_disable_depth)) 590 return 0; 591 592 return cdrom_check_events(&cd->cdi, clearing); 593 } 594 595 static int sr_block_revalidate_disk(struct gendisk *disk) 596 { 597 struct scsi_cd *cd = scsi_cd(disk); 598 struct scsi_sense_hdr sshdr; 599 600 /* if the unit is not ready, nothing more to do */ 601 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 602 goto out; 603 604 sr_cd_check(&cd->cdi); 605 get_sectorsize(cd); 606 out: 607 return 0; 608 } 609 610 static const struct block_device_operations sr_bdops = 611 { 612 .owner = THIS_MODULE, 613 .open = sr_block_open, 614 .release = sr_block_release, 615 .ioctl = sr_block_ioctl, 616 .check_events = sr_block_check_events, 617 .revalidate_disk = sr_block_revalidate_disk, 618 /* 619 * No compat_ioctl for now because sr_block_ioctl never 620 * seems to pass arbitrary ioctls down to host drivers. 621 */ 622 }; 623 624 static int sr_open(struct cdrom_device_info *cdi, int purpose) 625 { 626 struct scsi_cd *cd = cdi->handle; 627 struct scsi_device *sdev = cd->device; 628 int retval; 629 630 /* 631 * If the device is in error recovery, wait until it is done. 632 * If the device is offline, then disallow any access to it. 633 */ 634 retval = -ENXIO; 635 if (!scsi_block_when_processing_errors(sdev)) 636 goto error_out; 637 638 return 0; 639 640 error_out: 641 return retval; 642 } 643 644 static void sr_release(struct cdrom_device_info *cdi) 645 { 646 struct scsi_cd *cd = cdi->handle; 647 648 if (cd->device->sector_size > 2048) 649 sr_set_blocklength(cd, 2048); 650 651 } 652 653 static int sr_probe(struct device *dev) 654 { 655 struct scsi_device *sdev = to_scsi_device(dev); 656 struct gendisk *disk; 657 struct scsi_cd *cd; 658 int minor, error; 659 660 scsi_autopm_get_device(sdev); 661 error = -ENODEV; 662 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 663 goto fail; 664 665 error = -ENOMEM; 666 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 667 if (!cd) 668 goto fail; 669 670 kref_init(&cd->kref); 671 672 disk = alloc_disk(1); 673 if (!disk) 674 goto fail_free; 675 676 spin_lock(&sr_index_lock); 677 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 678 if (minor == SR_DISKS) { 679 spin_unlock(&sr_index_lock); 680 error = -EBUSY; 681 goto fail_put; 682 } 683 __set_bit(minor, sr_index_bits); 684 spin_unlock(&sr_index_lock); 685 686 disk->major = SCSI_CDROM_MAJOR; 687 disk->first_minor = minor; 688 sprintf(disk->disk_name, "sr%d", minor); 689 disk->fops = &sr_bdops; 690 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 691 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 692 693 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 694 695 cd->device = sdev; 696 cd->disk = disk; 697 cd->driver = &sr_template; 698 cd->disk = disk; 699 cd->capacity = 0x1fffff; 700 cd->device->changed = 1; /* force recheck CD type */ 701 cd->media_present = 1; 702 cd->use = 1; 703 cd->readcd_known = 0; 704 cd->readcd_cdda = 0; 705 706 cd->cdi.ops = &sr_dops; 707 cd->cdi.handle = cd; 708 cd->cdi.mask = 0; 709 cd->cdi.capacity = 1; 710 sprintf(cd->cdi.name, "sr%d", minor); 711 712 sdev->sector_size = 2048; /* A guess, just in case */ 713 714 /* FIXME: need to handle a get_capabilities failure properly ?? */ 715 get_capabilities(cd); 716 sr_vendor_init(cd); 717 718 disk->driverfs_dev = &sdev->sdev_gendev; 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 add_disk(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 int rc, n; 840 841 static const char *loadmech[] = 842 { 843 "caddy", 844 "tray", 845 "pop-up", 846 "", 847 "changer", 848 "cartridge changer", 849 "", 850 "" 851 }; 852 853 854 /* allocate transfer buffer */ 855 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 856 if (!buffer) { 857 sr_printk(KERN_ERR, cd, "out of memory.\n"); 858 return; 859 } 860 861 /* eat unit attentions */ 862 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 863 864 /* ask for mode page 0x2a */ 865 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 866 SR_TIMEOUT, 3, &data, NULL); 867 868 if (!scsi_status_is_good(rc)) { 869 /* failed, drive doesn't have capabilities mode page */ 870 cd->cdi.speed = 1; 871 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 872 CDC_DVD | CDC_DVD_RAM | 873 CDC_SELECT_DISC | CDC_SELECT_SPEED | 874 CDC_MRW | CDC_MRW_W | CDC_RAM); 875 kfree(buffer); 876 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 877 return; 878 } 879 880 n = data.header_length + data.block_descriptor_length; 881 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 882 cd->readcd_known = 1; 883 cd->readcd_cdda = buffer[n + 5] & 0x01; 884 /* print some capability bits */ 885 sr_printk(KERN_INFO, cd, 886 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 887 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 888 cd->cdi.speed, 889 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 890 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 891 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 892 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 893 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 894 loadmech[buffer[n + 6] >> 5]); 895 if ((buffer[n + 6] >> 5) == 0) 896 /* caddy drives can't close tray... */ 897 cd->cdi.mask |= CDC_CLOSE_TRAY; 898 if ((buffer[n + 2] & 0x8) == 0) 899 /* not a DVD drive */ 900 cd->cdi.mask |= CDC_DVD; 901 if ((buffer[n + 3] & 0x20) == 0) 902 /* can't write DVD-RAM media */ 903 cd->cdi.mask |= CDC_DVD_RAM; 904 if ((buffer[n + 3] & 0x10) == 0) 905 /* can't write DVD-R media */ 906 cd->cdi.mask |= CDC_DVD_R; 907 if ((buffer[n + 3] & 0x2) == 0) 908 /* can't write CD-RW media */ 909 cd->cdi.mask |= CDC_CD_RW; 910 if ((buffer[n + 3] & 0x1) == 0) 911 /* can't write CD-R media */ 912 cd->cdi.mask |= CDC_CD_R; 913 if ((buffer[n + 6] & 0x8) == 0) 914 /* can't eject */ 915 cd->cdi.mask |= CDC_OPEN_TRAY; 916 917 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 918 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 919 cd->cdi.capacity = 920 cdrom_number_of_slots(&cd->cdi); 921 if (cd->cdi.capacity <= 1) 922 /* not a changer */ 923 cd->cdi.mask |= CDC_SELECT_DISC; 924 /*else I don't think it can close its tray 925 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 926 927 /* 928 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 929 */ 930 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 931 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 932 cd->writeable = 1; 933 } 934 935 kfree(buffer); 936 } 937 938 /* 939 * sr_packet() is the entry point for the generic commands generated 940 * by the Uniform CD-ROM layer. 941 */ 942 static int sr_packet(struct cdrom_device_info *cdi, 943 struct packet_command *cgc) 944 { 945 struct scsi_cd *cd = cdi->handle; 946 struct scsi_device *sdev = cd->device; 947 948 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 949 return -EDRIVE_CANT_DO_THIS; 950 951 if (cgc->timeout <= 0) 952 cgc->timeout = IOCTL_TIMEOUT; 953 954 sr_do_ioctl(cd, cgc); 955 956 return cgc->stat; 957 } 958 959 /** 960 * sr_kref_release - Called to free the scsi_cd structure 961 * @kref: pointer to embedded kref 962 * 963 * sr_ref_mutex must be held entering this routine. Because it is 964 * called on last put, you should always use the scsi_cd_get() 965 * scsi_cd_put() helpers which manipulate the semaphore directly 966 * and never do a direct kref_put(). 967 **/ 968 static void sr_kref_release(struct kref *kref) 969 { 970 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 971 struct gendisk *disk = cd->disk; 972 973 spin_lock(&sr_index_lock); 974 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 975 spin_unlock(&sr_index_lock); 976 977 unregister_cdrom(&cd->cdi); 978 979 disk->private_data = NULL; 980 981 put_disk(disk); 982 983 kfree(cd); 984 } 985 986 static int sr_remove(struct device *dev) 987 { 988 struct scsi_cd *cd = dev_get_drvdata(dev); 989 990 scsi_autopm_get_device(cd->device); 991 992 del_gendisk(cd->disk); 993 994 mutex_lock(&sr_ref_mutex); 995 kref_put(&cd->kref, sr_kref_release); 996 mutex_unlock(&sr_ref_mutex); 997 998 return 0; 999 } 1000 1001 static int __init init_sr(void) 1002 { 1003 int rc; 1004 1005 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1006 if (rc) 1007 return rc; 1008 rc = scsi_register_driver(&sr_template.gendrv); 1009 if (rc) 1010 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1011 1012 return rc; 1013 } 1014 1015 static void __exit exit_sr(void) 1016 { 1017 scsi_unregister_driver(&sr_template.gendrv); 1018 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1019 } 1020 1021 module_init(init_sr); 1022 module_exit(exit_sr); 1023 MODULE_LICENSE("GPL"); 1024