1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sr.c Copyright (C) 1992 David Giller 4 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 5 * 6 * adapted from: 7 * sd.c Copyright (C) 1992 Drew Eckhardt 8 * Linux scsi disk driver by 9 * Drew Eckhardt <drew@colorado.edu> 10 * 11 * Modified by Eric Youngdale ericy@andante.org to 12 * add scatter-gather, multiple outstanding request, and other 13 * enhancements. 14 * 15 * Modified by Eric Youngdale eric@andante.org to support loadable 16 * low-level scsi drivers. 17 * 18 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to 19 * provide auto-eject. 20 * 21 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the 22 * generic cdrom interface 23 * 24 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() 25 * interface, capabilities probe additions, ioctl cleanups, etc. 26 * 27 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs 28 * 29 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM 30 * transparently and lose the GHOST hack 31 * 32 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> 33 * check resource allocation in sr_init and some cleanups 34 */ 35 36 #include <linux/module.h> 37 #include <linux/fs.h> 38 #include <linux/kernel.h> 39 #include <linux/mm.h> 40 #include <linux/bio.h> 41 #include <linux/string.h> 42 #include <linux/errno.h> 43 #include <linux/cdrom.h> 44 #include <linux/interrupt.h> 45 #include <linux/init.h> 46 #include <linux/blkdev.h> 47 #include <linux/blk-pm.h> 48 #include <linux/mutex.h> 49 #include <linux/slab.h> 50 #include <linux/pm_runtime.h> 51 #include <linux/uaccess.h> 52 53 #include <scsi/scsi.h> 54 #include <scsi/scsi_dbg.h> 55 #include <scsi/scsi_device.h> 56 #include <scsi/scsi_driver.h> 57 #include <scsi/scsi_cmnd.h> 58 #include <scsi/scsi_eh.h> 59 #include <scsi/scsi_host.h> 60 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 61 62 #include "scsi_logging.h" 63 #include "sr.h" 64 65 66 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 67 MODULE_LICENSE("GPL"); 68 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 69 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 70 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 71 72 #define SR_DISKS 256 73 74 #define SR_CAPABILITIES \ 75 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 76 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 77 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 78 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 79 CDC_MRW|CDC_MRW_W|CDC_RAM) 80 81 static DEFINE_MUTEX(sr_mutex); 82 static int sr_probe(struct device *); 83 static int sr_remove(struct device *); 84 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); 85 static int sr_done(struct scsi_cmnd *); 86 static int sr_runtime_suspend(struct device *dev); 87 88 static const struct dev_pm_ops sr_pm_ops = { 89 .runtime_suspend = sr_runtime_suspend, 90 }; 91 92 static struct scsi_driver sr_template = { 93 .gendrv = { 94 .name = "sr", 95 .owner = THIS_MODULE, 96 .probe = sr_probe, 97 .remove = sr_remove, 98 .pm = &sr_pm_ops, 99 }, 100 .init_command = sr_init_command, 101 .done = sr_done, 102 }; 103 104 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 105 static DEFINE_SPINLOCK(sr_index_lock); 106 107 /* This semaphore is used to mediate the 0->1 reference get in the 108 * face of object destruction (i.e. we can't allow a get on an 109 * object after last put) */ 110 static DEFINE_MUTEX(sr_ref_mutex); 111 112 static int sr_open(struct cdrom_device_info *, int); 113 static void sr_release(struct cdrom_device_info *); 114 115 static void get_sectorsize(struct scsi_cd *); 116 static void get_capabilities(struct scsi_cd *); 117 118 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 119 unsigned int clearing, int slot); 120 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 121 122 static const struct cdrom_device_ops sr_dops = { 123 .open = sr_open, 124 .release = sr_release, 125 .drive_status = sr_drive_status, 126 .check_events = sr_check_events, 127 .tray_move = sr_tray_move, 128 .lock_door = sr_lock_door, 129 .select_speed = sr_select_speed, 130 .get_last_session = sr_get_last_session, 131 .get_mcn = sr_get_mcn, 132 .reset = sr_reset, 133 .audio_ioctl = sr_audio_ioctl, 134 .capability = SR_CAPABILITIES, 135 .generic_packet = sr_packet, 136 }; 137 138 static void sr_kref_release(struct kref *kref); 139 140 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 141 { 142 return container_of(disk->private_data, struct scsi_cd, driver); 143 } 144 145 static int sr_runtime_suspend(struct device *dev) 146 { 147 struct scsi_cd *cd = dev_get_drvdata(dev); 148 149 if (!cd) /* E.g.: runtime suspend following sr_remove() */ 150 return 0; 151 152 if (cd->media_present) 153 return -EBUSY; 154 else 155 return 0; 156 } 157 158 /* 159 * The get and put routines for the struct scsi_cd. Note this entity 160 * has a scsi_device pointer and owns a reference to this. 161 */ 162 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 163 { 164 struct scsi_cd *cd = NULL; 165 166 mutex_lock(&sr_ref_mutex); 167 if (disk->private_data == NULL) 168 goto out; 169 cd = scsi_cd(disk); 170 kref_get(&cd->kref); 171 if (scsi_device_get(cd->device)) { 172 kref_put(&cd->kref, sr_kref_release); 173 cd = NULL; 174 } 175 out: 176 mutex_unlock(&sr_ref_mutex); 177 return cd; 178 } 179 180 static void scsi_cd_put(struct scsi_cd *cd) 181 { 182 struct scsi_device *sdev = cd->device; 183 184 mutex_lock(&sr_ref_mutex); 185 kref_put(&cd->kref, sr_kref_release); 186 scsi_device_put(sdev); 187 mutex_unlock(&sr_ref_mutex); 188 } 189 190 static unsigned int sr_get_events(struct scsi_device *sdev) 191 { 192 u8 buf[8]; 193 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 194 1, /* polled */ 195 0, 0, /* reserved */ 196 1 << 4, /* notification class: media */ 197 0, 0, /* reserved */ 198 0, sizeof(buf), /* allocation length */ 199 0, /* control */ 200 }; 201 struct event_header *eh = (void *)buf; 202 struct media_event_desc *med = (void *)(buf + 4); 203 struct scsi_sense_hdr sshdr; 204 int result; 205 206 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 207 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 208 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 209 return DISK_EVENT_MEDIA_CHANGE; 210 211 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 212 return 0; 213 214 if (eh->nea || eh->notification_class != 0x4) 215 return 0; 216 217 if (med->media_event_code == 1) 218 return DISK_EVENT_EJECT_REQUEST; 219 else if (med->media_event_code == 2) 220 return DISK_EVENT_MEDIA_CHANGE; 221 return 0; 222 } 223 224 /* 225 * This function checks to see if the media has been changed or eject 226 * button has been pressed. It is possible that we have already 227 * sensed a change, or the drive may have sensed one and not yet 228 * reported it. The past events are accumulated in sdev->changed and 229 * returned together with the current state. 230 */ 231 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 232 unsigned int clearing, int slot) 233 { 234 struct scsi_cd *cd = cdi->handle; 235 bool last_present; 236 struct scsi_sense_hdr sshdr; 237 unsigned int events; 238 int ret; 239 240 /* no changer support */ 241 if (CDSL_CURRENT != slot) 242 return 0; 243 244 events = sr_get_events(cd->device); 245 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 246 247 /* 248 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 249 * for several times in a row. We rely on TUR only for this likely 250 * broken device, to prevent generating incorrect media changed 251 * events for every open(). 252 */ 253 if (cd->ignore_get_event) { 254 events &= ~DISK_EVENT_MEDIA_CHANGE; 255 goto do_tur; 256 } 257 258 /* 259 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 260 * is being cleared. Note that there are devices which hang 261 * if asked to execute TUR repeatedly. 262 */ 263 if (cd->device->changed) { 264 events |= DISK_EVENT_MEDIA_CHANGE; 265 cd->device->changed = 0; 266 cd->tur_changed = true; 267 } 268 269 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 270 return events; 271 do_tur: 272 /* let's see whether the media is there with TUR */ 273 last_present = cd->media_present; 274 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 275 276 /* 277 * Media is considered to be present if TUR succeeds or fails with 278 * sense data indicating something other than media-not-present 279 * (ASC 0x3a). 280 */ 281 cd->media_present = scsi_status_is_good(ret) || 282 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 283 284 if (last_present != cd->media_present) 285 cd->device->changed = 1; 286 287 if (cd->device->changed) { 288 events |= DISK_EVENT_MEDIA_CHANGE; 289 cd->device->changed = 0; 290 cd->tur_changed = true; 291 } 292 293 if (cd->ignore_get_event) 294 return events; 295 296 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 297 if (!cd->tur_changed) { 298 if (cd->get_event_changed) { 299 if (cd->tur_mismatch++ > 8) { 300 sr_printk(KERN_WARNING, cd, 301 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 302 cd->ignore_get_event = true; 303 } 304 } else { 305 cd->tur_mismatch = 0; 306 } 307 } 308 cd->tur_changed = false; 309 cd->get_event_changed = false; 310 311 return events; 312 } 313 314 /* 315 * sr_done is the interrupt routine for the device driver. 316 * 317 * It will be notified on the end of a SCSI read / write, and will take one 318 * of several actions based on success or failure. 319 */ 320 static int sr_done(struct scsi_cmnd *SCpnt) 321 { 322 int result = SCpnt->result; 323 int this_count = scsi_bufflen(SCpnt); 324 int good_bytes = (result == 0 ? this_count : 0); 325 int block_sectors = 0; 326 long error_sector; 327 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 328 329 #ifdef DEBUG 330 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 331 #endif 332 333 /* 334 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 335 * success. Since this is a relatively rare error condition, no 336 * care is taken to avoid unnecessary additional work such as 337 * memcpy's that could be avoided. 338 */ 339 if (driver_byte(result) != 0 && /* An error occurred */ 340 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 341 switch (SCpnt->sense_buffer[2]) { 342 case MEDIUM_ERROR: 343 case VOLUME_OVERFLOW: 344 case ILLEGAL_REQUEST: 345 if (!(SCpnt->sense_buffer[0] & 0x90)) 346 break; 347 error_sector = (SCpnt->sense_buffer[3] << 24) | 348 (SCpnt->sense_buffer[4] << 16) | 349 (SCpnt->sense_buffer[5] << 8) | 350 SCpnt->sense_buffer[6]; 351 if (SCpnt->request->bio != NULL) 352 block_sectors = 353 bio_sectors(SCpnt->request->bio); 354 if (block_sectors < 4) 355 block_sectors = 4; 356 if (cd->device->sector_size == 2048) 357 error_sector <<= 2; 358 error_sector &= ~(block_sectors - 1); 359 good_bytes = (error_sector - 360 blk_rq_pos(SCpnt->request)) << 9; 361 if (good_bytes < 0 || good_bytes >= this_count) 362 good_bytes = 0; 363 /* 364 * The SCSI specification allows for the value 365 * returned by READ CAPACITY to be up to 75 2K 366 * sectors past the last readable block. 367 * Therefore, if we hit a medium error within the 368 * last 75 2K sectors, we decrease the saved size 369 * value. 370 */ 371 if (error_sector < get_capacity(cd->disk) && 372 cd->capacity - error_sector < 4 * 75) 373 set_capacity(cd->disk, error_sector); 374 break; 375 376 case RECOVERED_ERROR: 377 good_bytes = this_count; 378 break; 379 380 default: 381 break; 382 } 383 } 384 385 return good_bytes; 386 } 387 388 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) 389 { 390 int block = 0, this_count, s_size; 391 struct scsi_cd *cd; 392 struct request *rq = SCpnt->request; 393 blk_status_t ret; 394 395 ret = scsi_init_io(SCpnt); 396 if (ret != BLK_STS_OK) 397 goto out; 398 cd = scsi_cd(rq->rq_disk); 399 400 /* from here on until we're complete, any goto out 401 * is used for a killable error condition */ 402 ret = BLK_STS_IOERR; 403 404 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 405 "Doing sr request, block = %d\n", block)); 406 407 if (!cd->device || !scsi_device_online(cd->device)) { 408 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 409 "Finishing %u sectors\n", blk_rq_sectors(rq))); 410 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 411 "Retry with 0x%p\n", SCpnt)); 412 goto out; 413 } 414 415 if (cd->device->changed) { 416 /* 417 * quietly refuse to do anything to a changed disc until the 418 * changed bit has been reset 419 */ 420 goto out; 421 } 422 423 /* 424 * we do lazy blocksize switching (when reading XA sectors, 425 * see CDROMREADMODE2 ioctl) 426 */ 427 s_size = cd->device->sector_size; 428 if (s_size > 2048) { 429 if (!in_interrupt()) 430 sr_set_blocklength(cd, 2048); 431 else 432 scmd_printk(KERN_INFO, SCpnt, 433 "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 switch (req_op(rq)) { 442 case REQ_OP_WRITE: 443 if (!cd->writeable) 444 goto out; 445 SCpnt->cmnd[0] = WRITE_10; 446 cd->cdi.media_written = 1; 447 break; 448 case REQ_OP_READ: 449 SCpnt->cmnd[0] = READ_10; 450 break; 451 default: 452 blk_dump_rq_flags(rq, "Unknown sr command"); 453 goto out; 454 } 455 456 { 457 struct scatterlist *sg; 458 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 459 460 scsi_for_each_sg(SCpnt, sg, sg_count, i) 461 size += sg->length; 462 463 if (size != scsi_bufflen(SCpnt)) { 464 scmd_printk(KERN_ERR, SCpnt, 465 "mismatch count %d, bytes %d\n", 466 size, scsi_bufflen(SCpnt)); 467 if (scsi_bufflen(SCpnt) > size) 468 SCpnt->sdb.length = size; 469 } 470 } 471 472 /* 473 * request doesn't start on hw block boundary, add scatter pads 474 */ 475 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 476 (scsi_bufflen(SCpnt) % s_size)) { 477 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 478 goto out; 479 } 480 481 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 482 483 484 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 485 "%s %d/%u 512 byte blocks.\n", 486 (rq_data_dir(rq) == WRITE) ? 487 "writing" : "reading", 488 this_count, blk_rq_sectors(rq))); 489 490 SCpnt->cmnd[1] = 0; 491 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 492 493 if (this_count > 0xffff) { 494 this_count = 0xffff; 495 SCpnt->sdb.length = this_count * s_size; 496 } 497 498 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 499 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 500 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 501 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 502 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 503 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 504 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 505 506 /* 507 * We shouldn't disconnect in the middle of a sector, so with a dumb 508 * host adapter, it's safe to assume that we can at least transfer 509 * this many bytes between each connect / disconnect. 510 */ 511 SCpnt->transfersize = cd->device->sector_size; 512 SCpnt->underflow = this_count << 9; 513 SCpnt->allowed = MAX_RETRIES; 514 515 /* 516 * This indicates that the command is ready from our end to be 517 * queued. 518 */ 519 ret = BLK_STS_OK; 520 out: 521 return ret; 522 } 523 524 static int sr_block_open(struct block_device *bdev, fmode_t mode) 525 { 526 struct scsi_cd *cd; 527 struct scsi_device *sdev; 528 int ret = -ENXIO; 529 530 cd = scsi_cd_get(bdev->bd_disk); 531 if (!cd) 532 goto out; 533 534 sdev = cd->device; 535 scsi_autopm_get_device(sdev); 536 check_disk_change(bdev); 537 538 mutex_lock(&sr_mutex); 539 ret = cdrom_open(&cd->cdi, bdev, mode); 540 mutex_unlock(&sr_mutex); 541 542 scsi_autopm_put_device(sdev); 543 if (ret) 544 scsi_cd_put(cd); 545 546 out: 547 return ret; 548 } 549 550 static void sr_block_release(struct gendisk *disk, fmode_t mode) 551 { 552 struct scsi_cd *cd = scsi_cd(disk); 553 mutex_lock(&sr_mutex); 554 cdrom_release(&cd->cdi, mode); 555 scsi_cd_put(cd); 556 mutex_unlock(&sr_mutex); 557 } 558 559 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 560 unsigned long arg) 561 { 562 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 563 struct scsi_device *sdev = cd->device; 564 void __user *argp = (void __user *)arg; 565 int ret; 566 567 mutex_lock(&sr_mutex); 568 569 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 570 (mode & FMODE_NDELAY) != 0); 571 if (ret) 572 goto out; 573 574 scsi_autopm_get_device(sdev); 575 576 /* 577 * Send SCSI addressing ioctls directly to mid level, send other 578 * ioctls to cdrom/block level. 579 */ 580 switch (cmd) { 581 case SCSI_IOCTL_GET_IDLUN: 582 case SCSI_IOCTL_GET_BUS_NUMBER: 583 ret = scsi_ioctl(sdev, cmd, argp); 584 goto put; 585 } 586 587 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 588 if (ret != -ENOSYS) 589 goto put; 590 591 ret = scsi_ioctl(sdev, cmd, argp); 592 593 put: 594 scsi_autopm_put_device(sdev); 595 596 out: 597 mutex_unlock(&sr_mutex); 598 return ret; 599 } 600 601 static unsigned int sr_block_check_events(struct gendisk *disk, 602 unsigned int clearing) 603 { 604 unsigned int ret = 0; 605 struct scsi_cd *cd; 606 607 cd = scsi_cd_get(disk); 608 if (!cd) 609 return 0; 610 611 if (!atomic_read(&cd->device->disk_events_disable_depth)) 612 ret = cdrom_check_events(&cd->cdi, clearing); 613 614 scsi_cd_put(cd); 615 return ret; 616 } 617 618 static int sr_block_revalidate_disk(struct gendisk *disk) 619 { 620 struct scsi_sense_hdr sshdr; 621 struct scsi_cd *cd; 622 623 cd = scsi_cd_get(disk); 624 if (!cd) 625 return -ENXIO; 626 627 /* if the unit is not ready, nothing more to do */ 628 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 629 goto out; 630 631 sr_cd_check(&cd->cdi); 632 get_sectorsize(cd); 633 out: 634 scsi_cd_put(cd); 635 return 0; 636 } 637 638 static const struct block_device_operations sr_bdops = 639 { 640 .owner = THIS_MODULE, 641 .open = sr_block_open, 642 .release = sr_block_release, 643 .ioctl = sr_block_ioctl, 644 .check_events = sr_block_check_events, 645 .revalidate_disk = sr_block_revalidate_disk, 646 /* 647 * No compat_ioctl for now because sr_block_ioctl never 648 * seems to pass arbitrary ioctls down to host drivers. 649 */ 650 }; 651 652 static int sr_open(struct cdrom_device_info *cdi, int purpose) 653 { 654 struct scsi_cd *cd = cdi->handle; 655 struct scsi_device *sdev = cd->device; 656 int retval; 657 658 /* 659 * If the device is in error recovery, wait until it is done. 660 * If the device is offline, then disallow any access to it. 661 */ 662 retval = -ENXIO; 663 if (!scsi_block_when_processing_errors(sdev)) 664 goto error_out; 665 666 return 0; 667 668 error_out: 669 return retval; 670 } 671 672 static void sr_release(struct cdrom_device_info *cdi) 673 { 674 struct scsi_cd *cd = cdi->handle; 675 676 if (cd->device->sector_size > 2048) 677 sr_set_blocklength(cd, 2048); 678 679 } 680 681 static int sr_probe(struct device *dev) 682 { 683 struct scsi_device *sdev = to_scsi_device(dev); 684 struct gendisk *disk; 685 struct scsi_cd *cd; 686 int minor, error; 687 688 scsi_autopm_get_device(sdev); 689 error = -ENODEV; 690 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 691 goto fail; 692 693 error = -ENOMEM; 694 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 695 if (!cd) 696 goto fail; 697 698 kref_init(&cd->kref); 699 700 disk = alloc_disk(1); 701 if (!disk) 702 goto fail_free; 703 704 spin_lock(&sr_index_lock); 705 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 706 if (minor == SR_DISKS) { 707 spin_unlock(&sr_index_lock); 708 error = -EBUSY; 709 goto fail_put; 710 } 711 __set_bit(minor, sr_index_bits); 712 spin_unlock(&sr_index_lock); 713 714 disk->major = SCSI_CDROM_MAJOR; 715 disk->first_minor = minor; 716 sprintf(disk->disk_name, "sr%d", minor); 717 disk->fops = &sr_bdops; 718 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 719 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 720 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; 721 722 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 723 724 cd->device = sdev; 725 cd->disk = disk; 726 cd->driver = &sr_template; 727 cd->disk = disk; 728 cd->capacity = 0x1fffff; 729 cd->device->changed = 1; /* force recheck CD type */ 730 cd->media_present = 1; 731 cd->use = 1; 732 cd->readcd_known = 0; 733 cd->readcd_cdda = 0; 734 735 cd->cdi.ops = &sr_dops; 736 cd->cdi.handle = cd; 737 cd->cdi.mask = 0; 738 cd->cdi.capacity = 1; 739 sprintf(cd->cdi.name, "sr%d", minor); 740 741 sdev->sector_size = 2048; /* A guess, just in case */ 742 743 /* FIXME: need to handle a get_capabilities failure properly ?? */ 744 get_capabilities(cd); 745 sr_vendor_init(cd); 746 747 set_capacity(disk, cd->capacity); 748 disk->private_data = &cd->driver; 749 disk->queue = sdev->request_queue; 750 cd->cdi.disk = disk; 751 752 if (register_cdrom(&cd->cdi)) 753 goto fail_put; 754 755 /* 756 * Initialize block layer runtime PM stuffs before the 757 * periodic event checking request gets started in add_disk. 758 */ 759 blk_pm_runtime_init(sdev->request_queue, dev); 760 761 dev_set_drvdata(dev, cd); 762 disk->flags |= GENHD_FL_REMOVABLE; 763 device_add_disk(&sdev->sdev_gendev, disk, NULL); 764 765 sdev_printk(KERN_DEBUG, sdev, 766 "Attached scsi CD-ROM %s\n", cd->cdi.name); 767 scsi_autopm_put_device(cd->device); 768 769 return 0; 770 771 fail_put: 772 put_disk(disk); 773 fail_free: 774 kfree(cd); 775 fail: 776 scsi_autopm_put_device(sdev); 777 return error; 778 } 779 780 781 static void get_sectorsize(struct scsi_cd *cd) 782 { 783 unsigned char cmd[10]; 784 unsigned char buffer[8]; 785 int the_result, retries = 3; 786 int sector_size; 787 struct request_queue *queue; 788 789 do { 790 cmd[0] = READ_CAPACITY; 791 memset((void *) &cmd[1], 0, 9); 792 memset(buffer, 0, sizeof(buffer)); 793 794 /* Do the command and wait.. */ 795 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 796 buffer, sizeof(buffer), NULL, 797 SR_TIMEOUT, MAX_RETRIES, NULL); 798 799 retries--; 800 801 } while (the_result && retries); 802 803 804 if (the_result) { 805 cd->capacity = 0x1fffff; 806 sector_size = 2048; /* A guess, just in case */ 807 } else { 808 long last_written; 809 810 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | 811 (buffer[2] << 8) | buffer[3]); 812 /* 813 * READ_CAPACITY doesn't return the correct size on 814 * certain UDF media. If last_written is larger, use 815 * it instead. 816 * 817 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 818 */ 819 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 820 cd->capacity = max_t(long, cd->capacity, last_written); 821 822 sector_size = (buffer[4] << 24) | 823 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 824 switch (sector_size) { 825 /* 826 * HP 4020i CD-Recorder reports 2340 byte sectors 827 * Philips CD-Writers report 2352 byte sectors 828 * 829 * Use 2k sectors for them.. 830 */ 831 case 0: 832 case 2340: 833 case 2352: 834 sector_size = 2048; 835 /* fall through */ 836 case 2048: 837 cd->capacity *= 4; 838 /* fall through */ 839 case 512: 840 break; 841 default: 842 sr_printk(KERN_INFO, cd, 843 "unsupported sector size %d.", sector_size); 844 cd->capacity = 0; 845 } 846 847 cd->device->sector_size = sector_size; 848 849 /* 850 * Add this so that we have the ability to correctly gauge 851 * what the device is capable of. 852 */ 853 set_capacity(cd->disk, cd->capacity); 854 } 855 856 queue = cd->device->request_queue; 857 blk_queue_logical_block_size(queue, sector_size); 858 859 return; 860 } 861 862 static void get_capabilities(struct scsi_cd *cd) 863 { 864 unsigned char *buffer; 865 struct scsi_mode_data data; 866 struct scsi_sense_hdr sshdr; 867 unsigned int ms_len = 128; 868 int rc, n; 869 870 static const char *loadmech[] = 871 { 872 "caddy", 873 "tray", 874 "pop-up", 875 "", 876 "changer", 877 "cartridge changer", 878 "", 879 "" 880 }; 881 882 883 /* allocate transfer buffer */ 884 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 885 if (!buffer) { 886 sr_printk(KERN_ERR, cd, "out of memory.\n"); 887 return; 888 } 889 890 /* eat unit attentions */ 891 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 892 893 /* ask for mode page 0x2a */ 894 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 895 SR_TIMEOUT, 3, &data, NULL); 896 897 if (!scsi_status_is_good(rc) || data.length > ms_len || 898 data.header_length + data.block_descriptor_length > data.length) { 899 /* failed, drive doesn't have capabilities mode page */ 900 cd->cdi.speed = 1; 901 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 902 CDC_DVD | CDC_DVD_RAM | 903 CDC_SELECT_DISC | CDC_SELECT_SPEED | 904 CDC_MRW | CDC_MRW_W | CDC_RAM); 905 kfree(buffer); 906 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 907 return; 908 } 909 910 n = data.header_length + data.block_descriptor_length; 911 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 912 cd->readcd_known = 1; 913 cd->readcd_cdda = buffer[n + 5] & 0x01; 914 /* print some capability bits */ 915 sr_printk(KERN_INFO, cd, 916 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 917 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 918 cd->cdi.speed, 919 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 920 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 921 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 922 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 923 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 924 loadmech[buffer[n + 6] >> 5]); 925 if ((buffer[n + 6] >> 5) == 0) 926 /* caddy drives can't close tray... */ 927 cd->cdi.mask |= CDC_CLOSE_TRAY; 928 if ((buffer[n + 2] & 0x8) == 0) 929 /* not a DVD drive */ 930 cd->cdi.mask |= CDC_DVD; 931 if ((buffer[n + 3] & 0x20) == 0) 932 /* can't write DVD-RAM media */ 933 cd->cdi.mask |= CDC_DVD_RAM; 934 if ((buffer[n + 3] & 0x10) == 0) 935 /* can't write DVD-R media */ 936 cd->cdi.mask |= CDC_DVD_R; 937 if ((buffer[n + 3] & 0x2) == 0) 938 /* can't write CD-RW media */ 939 cd->cdi.mask |= CDC_CD_RW; 940 if ((buffer[n + 3] & 0x1) == 0) 941 /* can't write CD-R media */ 942 cd->cdi.mask |= CDC_CD_R; 943 if ((buffer[n + 6] & 0x8) == 0) 944 /* can't eject */ 945 cd->cdi.mask |= CDC_OPEN_TRAY; 946 947 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 948 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 949 cd->cdi.capacity = 950 cdrom_number_of_slots(&cd->cdi); 951 if (cd->cdi.capacity <= 1) 952 /* not a changer */ 953 cd->cdi.mask |= CDC_SELECT_DISC; 954 /*else I don't think it can close its tray 955 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 956 957 /* 958 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 959 */ 960 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 961 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 962 cd->writeable = 1; 963 } 964 965 kfree(buffer); 966 } 967 968 /* 969 * sr_packet() is the entry point for the generic commands generated 970 * by the Uniform CD-ROM layer. 971 */ 972 static int sr_packet(struct cdrom_device_info *cdi, 973 struct packet_command *cgc) 974 { 975 struct scsi_cd *cd = cdi->handle; 976 struct scsi_device *sdev = cd->device; 977 978 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 979 return -EDRIVE_CANT_DO_THIS; 980 981 if (cgc->timeout <= 0) 982 cgc->timeout = IOCTL_TIMEOUT; 983 984 sr_do_ioctl(cd, cgc); 985 986 return cgc->stat; 987 } 988 989 /** 990 * sr_kref_release - Called to free the scsi_cd structure 991 * @kref: pointer to embedded kref 992 * 993 * sr_ref_mutex must be held entering this routine. Because it is 994 * called on last put, you should always use the scsi_cd_get() 995 * scsi_cd_put() helpers which manipulate the semaphore directly 996 * and never do a direct kref_put(). 997 **/ 998 static void sr_kref_release(struct kref *kref) 999 { 1000 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 1001 struct gendisk *disk = cd->disk; 1002 1003 spin_lock(&sr_index_lock); 1004 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 1005 spin_unlock(&sr_index_lock); 1006 1007 unregister_cdrom(&cd->cdi); 1008 1009 disk->private_data = NULL; 1010 1011 put_disk(disk); 1012 1013 kfree(cd); 1014 } 1015 1016 static int sr_remove(struct device *dev) 1017 { 1018 struct scsi_cd *cd = dev_get_drvdata(dev); 1019 1020 scsi_autopm_get_device(cd->device); 1021 1022 del_gendisk(cd->disk); 1023 dev_set_drvdata(dev, NULL); 1024 1025 mutex_lock(&sr_ref_mutex); 1026 kref_put(&cd->kref, sr_kref_release); 1027 mutex_unlock(&sr_ref_mutex); 1028 1029 return 0; 1030 } 1031 1032 static int __init init_sr(void) 1033 { 1034 int rc; 1035 1036 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1037 if (rc) 1038 return rc; 1039 rc = scsi_register_driver(&sr_template.gendrv); 1040 if (rc) 1041 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1042 1043 return rc; 1044 } 1045 1046 static void __exit exit_sr(void) 1047 { 1048 scsi_unregister_driver(&sr_template.gendrv); 1049 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1050 } 1051 1052 module_init(init_sr); 1053 module_exit(exit_sr); 1054 MODULE_LICENSE("GPL"); 1055