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 goto out_put; 166 if (!scsi_autopm_get_device(cd->device)) 167 goto out; 168 169 out_put: 170 kref_put(&cd->kref, sr_kref_release); 171 cd = NULL; 172 out: 173 mutex_unlock(&sr_ref_mutex); 174 return cd; 175 } 176 177 static void scsi_cd_put(struct scsi_cd *cd) 178 { 179 struct scsi_device *sdev = cd->device; 180 181 mutex_lock(&sr_ref_mutex); 182 kref_put(&cd->kref, sr_kref_release); 183 scsi_autopm_put_device(sdev); 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 sdev_printk(KERN_WARNING, cd->device, 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 printk("sr.c 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_prep_fn(struct request_queue *q, struct request *rq) 387 { 388 int block = 0, this_count, s_size; 389 struct scsi_cd *cd; 390 struct scsi_cmnd *SCpnt; 391 struct scsi_device *sdp = q->queuedata; 392 int ret; 393 394 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 395 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 396 goto out; 397 } else if (rq->cmd_type != REQ_TYPE_FS) { 398 ret = BLKPREP_KILL; 399 goto out; 400 } 401 ret = scsi_setup_fs_cmnd(sdp, rq); 402 if (ret != BLKPREP_OK) 403 goto out; 404 SCpnt = rq->special; 405 cd = scsi_cd(rq->rq_disk); 406 407 /* from here on until we're complete, any goto out 408 * is used for a killable error condition */ 409 ret = BLKPREP_KILL; 410 411 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 412 cd->disk->disk_name, block)); 413 414 if (!cd->device || !scsi_device_online(cd->device)) { 415 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n", 416 blk_rq_sectors(rq))); 417 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 418 goto out; 419 } 420 421 if (cd->device->changed) { 422 /* 423 * quietly refuse to do anything to a changed disc until the 424 * changed bit has been reset 425 */ 426 goto out; 427 } 428 429 /* 430 * we do lazy blocksize switching (when reading XA sectors, 431 * see CDROMREADMODE2 ioctl) 432 */ 433 s_size = cd->device->sector_size; 434 if (s_size > 2048) { 435 if (!in_interrupt()) 436 sr_set_blocklength(cd, 2048); 437 else 438 printk("sr: can't switch blocksize: in interrupt\n"); 439 } 440 441 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 442 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 443 goto out; 444 } 445 446 if (rq_data_dir(rq) == WRITE) { 447 if (!cd->device->writeable) 448 goto out; 449 SCpnt->cmnd[0] = WRITE_10; 450 SCpnt->sc_data_direction = DMA_TO_DEVICE; 451 cd->cdi.media_written = 1; 452 } else if (rq_data_dir(rq) == READ) { 453 SCpnt->cmnd[0] = READ_10; 454 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 455 } else { 456 blk_dump_rq_flags(rq, "Unknown sr command"); 457 goto out; 458 } 459 460 { 461 struct scatterlist *sg; 462 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 463 464 scsi_for_each_sg(SCpnt, sg, sg_count, i) 465 size += sg->length; 466 467 if (size != scsi_bufflen(SCpnt)) { 468 scmd_printk(KERN_ERR, SCpnt, 469 "mismatch count %d, bytes %d\n", 470 size, scsi_bufflen(SCpnt)); 471 if (scsi_bufflen(SCpnt) > size) 472 SCpnt->sdb.length = size; 473 } 474 } 475 476 /* 477 * request doesn't start on hw block boundary, add scatter pads 478 */ 479 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 480 (scsi_bufflen(SCpnt) % s_size)) { 481 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 482 goto out; 483 } 484 485 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 486 487 488 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n", 489 cd->cdi.name, 490 (rq_data_dir(rq) == WRITE) ? 491 "writing" : "reading", 492 this_count, blk_rq_sectors(rq))); 493 494 SCpnt->cmnd[1] = 0; 495 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 496 497 if (this_count > 0xffff) { 498 this_count = 0xffff; 499 SCpnt->sdb.length = this_count * s_size; 500 } 501 502 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 503 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 504 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 505 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 506 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 507 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 508 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 509 510 /* 511 * We shouldn't disconnect in the middle of a sector, so with a dumb 512 * host adapter, it's safe to assume that we can at least transfer 513 * this many bytes between each connect / disconnect. 514 */ 515 SCpnt->transfersize = cd->device->sector_size; 516 SCpnt->underflow = this_count << 9; 517 SCpnt->allowed = MAX_RETRIES; 518 519 /* 520 * This indicates that the command is ready from our end to be 521 * queued. 522 */ 523 ret = BLKPREP_OK; 524 out: 525 return scsi_prep_return(q, rq, ret); 526 } 527 528 static int sr_block_open(struct block_device *bdev, fmode_t mode) 529 { 530 struct scsi_cd *cd; 531 int ret = -ENXIO; 532 533 mutex_lock(&sr_mutex); 534 cd = scsi_cd_get(bdev->bd_disk); 535 if (cd) { 536 ret = cdrom_open(&cd->cdi, bdev, mode); 537 if (ret) 538 scsi_cd_put(cd); 539 } 540 mutex_unlock(&sr_mutex); 541 return ret; 542 } 543 544 static void sr_block_release(struct gendisk *disk, fmode_t mode) 545 { 546 struct scsi_cd *cd = scsi_cd(disk); 547 mutex_lock(&sr_mutex); 548 cdrom_release(&cd->cdi, mode); 549 scsi_cd_put(cd); 550 mutex_unlock(&sr_mutex); 551 } 552 553 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 554 unsigned long arg) 555 { 556 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 557 struct scsi_device *sdev = cd->device; 558 void __user *argp = (void __user *)arg; 559 int ret; 560 561 scsi_autopm_get_device(cd->device); 562 563 mutex_lock(&sr_mutex); 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 /* 581 * ENODEV means that we didn't recognise the ioctl, or that we 582 * cannot execute it in the current device state. In either 583 * case fall through to scsi_ioctl, which will return ENDOEV again 584 * if it doesn't recognise the ioctl 585 */ 586 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, 587 (mode & FMODE_NDELAY) != 0); 588 if (ret != -ENODEV) 589 goto out; 590 ret = scsi_ioctl(sdev, cmd, argp); 591 592 out: 593 mutex_unlock(&sr_mutex); 594 scsi_autopm_put_device(cd->device); 595 return ret; 596 } 597 598 static unsigned int sr_block_check_events(struct gendisk *disk, 599 unsigned int clearing) 600 { 601 struct scsi_cd *cd = scsi_cd(disk); 602 unsigned int ret; 603 604 if (atomic_read(&cd->device->disk_events_disable_depth) == 0) { 605 scsi_autopm_get_device(cd->device); 606 ret = cdrom_check_events(&cd->cdi, clearing); 607 scsi_autopm_put_device(cd->device); 608 } else { 609 ret = 0; 610 } 611 612 return ret; 613 } 614 615 static int sr_block_revalidate_disk(struct gendisk *disk) 616 { 617 struct scsi_cd *cd = scsi_cd(disk); 618 struct scsi_sense_hdr sshdr; 619 620 scsi_autopm_get_device(cd->device); 621 622 /* if the unit is not ready, nothing more to do */ 623 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 624 goto out; 625 626 sr_cd_check(&cd->cdi); 627 get_sectorsize(cd); 628 out: 629 scsi_autopm_put_device(cd->device); 630 return 0; 631 } 632 633 static const struct block_device_operations sr_bdops = 634 { 635 .owner = THIS_MODULE, 636 .open = sr_block_open, 637 .release = sr_block_release, 638 .ioctl = sr_block_ioctl, 639 .check_events = sr_block_check_events, 640 .revalidate_disk = sr_block_revalidate_disk, 641 /* 642 * No compat_ioctl for now because sr_block_ioctl never 643 * seems to pass arbitrary ioctls down to host drivers. 644 */ 645 }; 646 647 static int sr_open(struct cdrom_device_info *cdi, int purpose) 648 { 649 struct scsi_cd *cd = cdi->handle; 650 struct scsi_device *sdev = cd->device; 651 int retval; 652 653 /* 654 * If the device is in error recovery, wait until it is done. 655 * If the device is offline, then disallow any access to it. 656 */ 657 retval = -ENXIO; 658 if (!scsi_block_when_processing_errors(sdev)) 659 goto error_out; 660 661 return 0; 662 663 error_out: 664 return retval; 665 } 666 667 static void sr_release(struct cdrom_device_info *cdi) 668 { 669 struct scsi_cd *cd = cdi->handle; 670 671 if (cd->device->sector_size > 2048) 672 sr_set_blocklength(cd, 2048); 673 674 } 675 676 static int sr_probe(struct device *dev) 677 { 678 struct scsi_device *sdev = to_scsi_device(dev); 679 struct gendisk *disk; 680 struct scsi_cd *cd; 681 int minor, error; 682 683 error = -ENODEV; 684 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 685 goto fail; 686 687 error = -ENOMEM; 688 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 689 if (!cd) 690 goto fail; 691 692 kref_init(&cd->kref); 693 694 disk = alloc_disk(1); 695 if (!disk) 696 goto fail_free; 697 698 spin_lock(&sr_index_lock); 699 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 700 if (minor == SR_DISKS) { 701 spin_unlock(&sr_index_lock); 702 error = -EBUSY; 703 goto fail_put; 704 } 705 __set_bit(minor, sr_index_bits); 706 spin_unlock(&sr_index_lock); 707 708 disk->major = SCSI_CDROM_MAJOR; 709 disk->first_minor = minor; 710 sprintf(disk->disk_name, "sr%d", minor); 711 disk->fops = &sr_bdops; 712 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 713 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 714 715 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 716 717 cd->device = sdev; 718 cd->disk = disk; 719 cd->driver = &sr_template; 720 cd->disk = disk; 721 cd->capacity = 0x1fffff; 722 cd->device->changed = 1; /* force recheck CD type */ 723 cd->media_present = 1; 724 cd->use = 1; 725 cd->readcd_known = 0; 726 cd->readcd_cdda = 0; 727 728 cd->cdi.ops = &sr_dops; 729 cd->cdi.handle = cd; 730 cd->cdi.mask = 0; 731 cd->cdi.capacity = 1; 732 sprintf(cd->cdi.name, "sr%d", minor); 733 734 sdev->sector_size = 2048; /* A guess, just in case */ 735 736 /* FIXME: need to handle a get_capabilities failure properly ?? */ 737 get_capabilities(cd); 738 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); 739 sr_vendor_init(cd); 740 741 disk->driverfs_dev = &sdev->sdev_gendev; 742 set_capacity(disk, cd->capacity); 743 disk->private_data = &cd->driver; 744 disk->queue = sdev->request_queue; 745 cd->cdi.disk = disk; 746 747 if (register_cdrom(&cd->cdi)) 748 goto fail_put; 749 750 dev_set_drvdata(dev, cd); 751 disk->flags |= GENHD_FL_REMOVABLE; 752 add_disk(disk); 753 754 sdev_printk(KERN_DEBUG, sdev, 755 "Attached scsi CD-ROM %s\n", cd->cdi.name); 756 scsi_autopm_put_device(cd->device); 757 758 return 0; 759 760 fail_put: 761 put_disk(disk); 762 fail_free: 763 kfree(cd); 764 fail: 765 return error; 766 } 767 768 769 static void get_sectorsize(struct scsi_cd *cd) 770 { 771 unsigned char cmd[10]; 772 unsigned char buffer[8]; 773 int the_result, retries = 3; 774 int sector_size; 775 struct request_queue *queue; 776 777 do { 778 cmd[0] = READ_CAPACITY; 779 memset((void *) &cmd[1], 0, 9); 780 memset(buffer, 0, sizeof(buffer)); 781 782 /* Do the command and wait.. */ 783 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 784 buffer, sizeof(buffer), NULL, 785 SR_TIMEOUT, MAX_RETRIES, NULL); 786 787 retries--; 788 789 } while (the_result && retries); 790 791 792 if (the_result) { 793 cd->capacity = 0x1fffff; 794 sector_size = 2048; /* A guess, just in case */ 795 } else { 796 long last_written; 797 798 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | 799 (buffer[2] << 8) | buffer[3]); 800 /* 801 * READ_CAPACITY doesn't return the correct size on 802 * certain UDF media. If last_written is larger, use 803 * it instead. 804 * 805 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 806 */ 807 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 808 cd->capacity = max_t(long, cd->capacity, last_written); 809 810 sector_size = (buffer[4] << 24) | 811 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 812 switch (sector_size) { 813 /* 814 * HP 4020i CD-Recorder reports 2340 byte sectors 815 * Philips CD-Writers report 2352 byte sectors 816 * 817 * Use 2k sectors for them.. 818 */ 819 case 0: 820 case 2340: 821 case 2352: 822 sector_size = 2048; 823 /* fall through */ 824 case 2048: 825 cd->capacity *= 4; 826 /* fall through */ 827 case 512: 828 break; 829 default: 830 printk("%s: unsupported sector size %d.\n", 831 cd->cdi.name, sector_size); 832 cd->capacity = 0; 833 } 834 835 cd->device->sector_size = sector_size; 836 837 /* 838 * Add this so that we have the ability to correctly gauge 839 * what the device is capable of. 840 */ 841 set_capacity(cd->disk, cd->capacity); 842 } 843 844 queue = cd->device->request_queue; 845 blk_queue_logical_block_size(queue, sector_size); 846 847 return; 848 } 849 850 static void get_capabilities(struct scsi_cd *cd) 851 { 852 unsigned char *buffer; 853 struct scsi_mode_data data; 854 struct scsi_sense_hdr sshdr; 855 int rc, n; 856 857 static const char *loadmech[] = 858 { 859 "caddy", 860 "tray", 861 "pop-up", 862 "", 863 "changer", 864 "cartridge changer", 865 "", 866 "" 867 }; 868 869 870 /* allocate transfer buffer */ 871 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 872 if (!buffer) { 873 printk(KERN_ERR "sr: out of memory.\n"); 874 return; 875 } 876 877 /* eat unit attentions */ 878 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 879 880 /* ask for mode page 0x2a */ 881 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 882 SR_TIMEOUT, 3, &data, NULL); 883 884 if (!scsi_status_is_good(rc)) { 885 /* failed, drive doesn't have capabilities mode page */ 886 cd->cdi.speed = 1; 887 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 888 CDC_DVD | CDC_DVD_RAM | 889 CDC_SELECT_DISC | CDC_SELECT_SPEED | 890 CDC_MRW | CDC_MRW_W | CDC_RAM); 891 kfree(buffer); 892 printk("%s: scsi-1 drive\n", cd->cdi.name); 893 return; 894 } 895 896 n = data.header_length + data.block_descriptor_length; 897 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 898 cd->readcd_known = 1; 899 cd->readcd_cdda = buffer[n + 5] & 0x01; 900 /* print some capability bits */ 901 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 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->device->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 blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn); 1008 del_gendisk(cd->disk); 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