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