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/compat.h> 42 #include <linux/string.h> 43 #include <linux/errno.h> 44 #include <linux/cdrom.h> 45 #include <linux/interrupt.h> 46 #include <linux/init.h> 47 #include <linux/blkdev.h> 48 #include <linux/blk-pm.h> 49 #include <linux/mutex.h> 50 #include <linux/slab.h> 51 #include <linux/pm_runtime.h> 52 #include <linux/uaccess.h> 53 54 #include <asm/unaligned.h> 55 56 #include <scsi/scsi.h> 57 #include <scsi/scsi_dbg.h> 58 #include <scsi/scsi_device.h> 59 #include <scsi/scsi_driver.h> 60 #include <scsi/scsi_cmnd.h> 61 #include <scsi/scsi_eh.h> 62 #include <scsi/scsi_host.h> 63 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 64 65 #include "scsi_logging.h" 66 #include "sr.h" 67 68 69 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 70 MODULE_LICENSE("GPL"); 71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 72 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 73 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 74 75 #define SR_DISKS 256 76 77 #define SR_CAPABILITIES \ 78 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 79 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 80 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 81 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 82 CDC_MRW|CDC_MRW_W|CDC_RAM) 83 84 static int sr_probe(struct device *); 85 static int sr_remove(struct device *); 86 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); 87 static int sr_done(struct scsi_cmnd *); 88 static int sr_runtime_suspend(struct device *dev); 89 90 static const struct dev_pm_ops sr_pm_ops = { 91 .runtime_suspend = sr_runtime_suspend, 92 }; 93 94 static struct scsi_driver sr_template = { 95 .gendrv = { 96 .name = "sr", 97 .owner = THIS_MODULE, 98 .probe = sr_probe, 99 .remove = sr_remove, 100 .pm = &sr_pm_ops, 101 }, 102 .init_command = sr_init_command, 103 .done = sr_done, 104 }; 105 106 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 107 static DEFINE_SPINLOCK(sr_index_lock); 108 109 static struct lock_class_key sr_bio_compl_lkclass; 110 111 /* This semaphore is used to mediate the 0->1 reference get in the 112 * face of object destruction (i.e. we can't allow a get on an 113 * object after last put) */ 114 static DEFINE_MUTEX(sr_ref_mutex); 115 116 static int sr_open(struct cdrom_device_info *, int); 117 static void sr_release(struct cdrom_device_info *); 118 119 static void get_sectorsize(struct scsi_cd *); 120 static void get_capabilities(struct scsi_cd *); 121 122 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 123 unsigned int clearing, int slot); 124 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 125 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 126 u32 lba, u32 nr, u8 *last_sense); 127 128 static const struct cdrom_device_ops sr_dops = { 129 .open = sr_open, 130 .release = sr_release, 131 .drive_status = sr_drive_status, 132 .check_events = sr_check_events, 133 .tray_move = sr_tray_move, 134 .lock_door = sr_lock_door, 135 .select_speed = sr_select_speed, 136 .get_last_session = sr_get_last_session, 137 .get_mcn = sr_get_mcn, 138 .reset = sr_reset, 139 .audio_ioctl = sr_audio_ioctl, 140 .generic_packet = sr_packet, 141 .read_cdda_bpc = sr_read_cdda_bpc, 142 .capability = SR_CAPABILITIES, 143 }; 144 145 static void sr_kref_release(struct kref *kref); 146 147 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 148 { 149 return container_of(disk->private_data, struct scsi_cd, driver); 150 } 151 152 static int sr_runtime_suspend(struct device *dev) 153 { 154 struct scsi_cd *cd = dev_get_drvdata(dev); 155 156 if (!cd) /* E.g.: runtime suspend following sr_remove() */ 157 return 0; 158 159 if (cd->media_present) 160 return -EBUSY; 161 else 162 return 0; 163 } 164 165 /* 166 * The get and put routines for the struct scsi_cd. Note this entity 167 * has a scsi_device pointer and owns a reference to this. 168 */ 169 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 170 { 171 struct scsi_cd *cd = NULL; 172 173 mutex_lock(&sr_ref_mutex); 174 if (disk->private_data == NULL) 175 goto out; 176 cd = scsi_cd(disk); 177 kref_get(&cd->kref); 178 if (scsi_device_get(cd->device)) { 179 kref_put(&cd->kref, sr_kref_release); 180 cd = NULL; 181 } 182 out: 183 mutex_unlock(&sr_ref_mutex); 184 return cd; 185 } 186 187 static void scsi_cd_put(struct scsi_cd *cd) 188 { 189 struct scsi_device *sdev = cd->device; 190 191 mutex_lock(&sr_ref_mutex); 192 kref_put(&cd->kref, sr_kref_release); 193 scsi_device_put(sdev); 194 mutex_unlock(&sr_ref_mutex); 195 } 196 197 static unsigned int sr_get_events(struct scsi_device *sdev) 198 { 199 u8 buf[8]; 200 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 201 1, /* polled */ 202 0, 0, /* reserved */ 203 1 << 4, /* notification class: media */ 204 0, 0, /* reserved */ 205 0, sizeof(buf), /* allocation length */ 206 0, /* control */ 207 }; 208 struct event_header *eh = (void *)buf; 209 struct media_event_desc *med = (void *)(buf + 4); 210 struct scsi_sense_hdr sshdr; 211 int result; 212 213 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 214 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 215 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 216 return DISK_EVENT_MEDIA_CHANGE; 217 218 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 219 return 0; 220 221 if (eh->nea || eh->notification_class != 0x4) 222 return 0; 223 224 if (med->media_event_code == 1) 225 return DISK_EVENT_EJECT_REQUEST; 226 else if (med->media_event_code == 2) 227 return DISK_EVENT_MEDIA_CHANGE; 228 else if (med->media_event_code == 3) 229 return DISK_EVENT_MEDIA_CHANGE; 230 return 0; 231 } 232 233 /* 234 * This function checks to see if the media has been changed or eject 235 * button has been pressed. It is possible that we have already 236 * sensed a change, or the drive may have sensed one and not yet 237 * reported it. The past events are accumulated in sdev->changed and 238 * returned together with the current state. 239 */ 240 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 241 unsigned int clearing, int slot) 242 { 243 struct scsi_cd *cd = cdi->handle; 244 bool last_present; 245 struct scsi_sense_hdr sshdr; 246 unsigned int events; 247 int ret; 248 249 /* no changer support */ 250 if (CDSL_CURRENT != slot) 251 return 0; 252 253 events = sr_get_events(cd->device); 254 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 255 256 /* 257 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 258 * for several times in a row. We rely on TUR only for this likely 259 * broken device, to prevent generating incorrect media changed 260 * events for every open(). 261 */ 262 if (cd->ignore_get_event) { 263 events &= ~DISK_EVENT_MEDIA_CHANGE; 264 goto do_tur; 265 } 266 267 /* 268 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 269 * is being cleared. Note that there are devices which hang 270 * if asked to execute TUR repeatedly. 271 */ 272 if (cd->device->changed) { 273 events |= DISK_EVENT_MEDIA_CHANGE; 274 cd->device->changed = 0; 275 cd->tur_changed = true; 276 } 277 278 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 279 return events; 280 do_tur: 281 /* let's see whether the media is there with TUR */ 282 last_present = cd->media_present; 283 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 284 285 /* 286 * Media is considered to be present if TUR succeeds or fails with 287 * sense data indicating something other than media-not-present 288 * (ASC 0x3a). 289 */ 290 cd->media_present = scsi_status_is_good(ret) || 291 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 292 293 if (last_present != cd->media_present) 294 cd->device->changed = 1; 295 296 if (cd->device->changed) { 297 events |= DISK_EVENT_MEDIA_CHANGE; 298 cd->device->changed = 0; 299 cd->tur_changed = true; 300 } 301 302 if (cd->ignore_get_event) 303 return events; 304 305 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 306 if (!cd->tur_changed) { 307 if (cd->get_event_changed) { 308 if (cd->tur_mismatch++ > 8) { 309 sr_printk(KERN_WARNING, cd, 310 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 311 cd->ignore_get_event = true; 312 } 313 } else { 314 cd->tur_mismatch = 0; 315 } 316 } 317 cd->tur_changed = false; 318 cd->get_event_changed = false; 319 320 return events; 321 } 322 323 /* 324 * sr_done is the interrupt routine for the device driver. 325 * 326 * It will be notified on the end of a SCSI read / write, and will take one 327 * of several actions based on success or failure. 328 */ 329 static int sr_done(struct scsi_cmnd *SCpnt) 330 { 331 int result = SCpnt->result; 332 int this_count = scsi_bufflen(SCpnt); 333 int good_bytes = (result == 0 ? this_count : 0); 334 int block_sectors = 0; 335 long error_sector; 336 struct request *rq = scsi_cmd_to_rq(SCpnt); 337 struct scsi_cd *cd = scsi_cd(rq->rq_disk); 338 339 #ifdef DEBUG 340 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 341 #endif 342 343 /* 344 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 345 * success. Since this is a relatively rare error condition, no 346 * care is taken to avoid unnecessary additional work such as 347 * memcpy's that could be avoided. 348 */ 349 if (scsi_status_is_check_condition(result) && 350 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 351 switch (SCpnt->sense_buffer[2]) { 352 case MEDIUM_ERROR: 353 case VOLUME_OVERFLOW: 354 case ILLEGAL_REQUEST: 355 if (!(SCpnt->sense_buffer[0] & 0x90)) 356 break; 357 error_sector = 358 get_unaligned_be32(&SCpnt->sense_buffer[3]); 359 if (rq->bio != NULL) 360 block_sectors = bio_sectors(rq->bio); 361 if (block_sectors < 4) 362 block_sectors = 4; 363 if (cd->device->sector_size == 2048) 364 error_sector <<= 2; 365 error_sector &= ~(block_sectors - 1); 366 good_bytes = (error_sector - blk_rq_pos(rq)) << 9; 367 if (good_bytes < 0 || good_bytes >= this_count) 368 good_bytes = 0; 369 /* 370 * The SCSI specification allows for the value 371 * returned by READ CAPACITY to be up to 75 2K 372 * sectors past the last readable block. 373 * Therefore, if we hit a medium error within the 374 * last 75 2K sectors, we decrease the saved size 375 * value. 376 */ 377 if (error_sector < get_capacity(cd->disk) && 378 cd->capacity - error_sector < 4 * 75) 379 set_capacity(cd->disk, error_sector); 380 break; 381 382 case RECOVERED_ERROR: 383 good_bytes = this_count; 384 break; 385 386 default: 387 break; 388 } 389 } 390 391 return good_bytes; 392 } 393 394 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) 395 { 396 int block = 0, this_count, s_size; 397 struct scsi_cd *cd; 398 struct request *rq = scsi_cmd_to_rq(SCpnt); 399 blk_status_t ret; 400 401 ret = scsi_alloc_sgtables(SCpnt); 402 if (ret != BLK_STS_OK) 403 return ret; 404 cd = scsi_cd(rq->rq_disk); 405 406 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 407 "Doing sr request, block = %d\n", block)); 408 409 if (!cd->device || !scsi_device_online(cd->device)) { 410 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 411 "Finishing %u sectors\n", blk_rq_sectors(rq))); 412 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 413 "Retry with 0x%p\n", SCpnt)); 414 goto out; 415 } 416 417 if (cd->device->changed) { 418 /* 419 * quietly refuse to do anything to a changed disc until the 420 * changed bit has been reset 421 */ 422 goto out; 423 } 424 425 s_size = cd->device->sector_size; 426 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 427 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 428 goto out; 429 } 430 431 switch (req_op(rq)) { 432 case REQ_OP_WRITE: 433 if (!cd->writeable) 434 goto out; 435 SCpnt->cmnd[0] = WRITE_10; 436 cd->cdi.media_written = 1; 437 break; 438 case REQ_OP_READ: 439 SCpnt->cmnd[0] = READ_10; 440 break; 441 default: 442 blk_dump_rq_flags(rq, "Unknown sr command"); 443 goto out; 444 } 445 446 { 447 struct scatterlist *sg; 448 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 449 450 scsi_for_each_sg(SCpnt, sg, sg_count, i) 451 size += sg->length; 452 453 if (size != scsi_bufflen(SCpnt)) { 454 scmd_printk(KERN_ERR, SCpnt, 455 "mismatch count %d, bytes %d\n", 456 size, scsi_bufflen(SCpnt)); 457 if (scsi_bufflen(SCpnt) > size) 458 SCpnt->sdb.length = size; 459 } 460 } 461 462 /* 463 * request doesn't start on hw block boundary, add scatter pads 464 */ 465 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 466 (scsi_bufflen(SCpnt) % s_size)) { 467 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 468 goto out; 469 } 470 471 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 472 473 474 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 475 "%s %d/%u 512 byte blocks.\n", 476 (rq_data_dir(rq) == WRITE) ? 477 "writing" : "reading", 478 this_count, blk_rq_sectors(rq))); 479 480 SCpnt->cmnd[1] = 0; 481 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 482 483 if (this_count > 0xffff) { 484 this_count = 0xffff; 485 SCpnt->sdb.length = this_count * s_size; 486 } 487 488 put_unaligned_be32(block, &SCpnt->cmnd[2]); 489 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 490 put_unaligned_be16(this_count, &SCpnt->cmnd[7]); 491 492 /* 493 * We shouldn't disconnect in the middle of a sector, so with a dumb 494 * host adapter, it's safe to assume that we can at least transfer 495 * this many bytes between each connect / disconnect. 496 */ 497 SCpnt->transfersize = cd->device->sector_size; 498 SCpnt->underflow = this_count << 9; 499 SCpnt->allowed = MAX_RETRIES; 500 SCpnt->cmd_len = 10; 501 502 /* 503 * This indicates that the command is ready from our end to be queued. 504 */ 505 return BLK_STS_OK; 506 out: 507 scsi_free_sgtables(SCpnt); 508 return BLK_STS_IOERR; 509 } 510 511 static void sr_revalidate_disk(struct scsi_cd *cd) 512 { 513 struct scsi_sense_hdr sshdr; 514 515 /* if the unit is not ready, nothing more to do */ 516 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 517 return; 518 sr_cd_check(&cd->cdi); 519 get_sectorsize(cd); 520 } 521 522 static int sr_block_open(struct block_device *bdev, fmode_t mode) 523 { 524 struct scsi_cd *cd; 525 struct scsi_device *sdev; 526 int ret = -ENXIO; 527 528 cd = scsi_cd_get(bdev->bd_disk); 529 if (!cd) 530 goto out; 531 532 sdev = cd->device; 533 scsi_autopm_get_device(sdev); 534 if (bdev_check_media_change(bdev)) 535 sr_revalidate_disk(cd); 536 537 mutex_lock(&cd->lock); 538 ret = cdrom_open(&cd->cdi, bdev, mode); 539 mutex_unlock(&cd->lock); 540 541 scsi_autopm_put_device(sdev); 542 if (ret) 543 scsi_cd_put(cd); 544 545 out: 546 return ret; 547 } 548 549 static void sr_block_release(struct gendisk *disk, fmode_t mode) 550 { 551 struct scsi_cd *cd = scsi_cd(disk); 552 553 mutex_lock(&cd->lock); 554 cdrom_release(&cd->cdi, mode); 555 mutex_unlock(&cd->lock); 556 557 scsi_cd_put(cd); 558 } 559 560 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 561 unsigned long arg) 562 { 563 struct gendisk *disk = bdev->bd_disk; 564 struct scsi_cd *cd = scsi_cd(disk); 565 struct scsi_device *sdev = cd->device; 566 void __user *argp = (void __user *)arg; 567 int ret; 568 569 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO)) 570 return -ENOIOCTLCMD; 571 572 mutex_lock(&cd->lock); 573 574 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 575 (mode & FMODE_NDELAY) != 0); 576 if (ret) 577 goto out; 578 579 scsi_autopm_get_device(sdev); 580 581 if (ret != CDROMCLOSETRAY && ret != CDROMEJECT) { 582 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 583 if (ret != -ENOSYS) 584 goto put; 585 } 586 ret = scsi_ioctl(sdev, disk, mode, cmd, argp); 587 588 put: 589 scsi_autopm_put_device(sdev); 590 out: 591 mutex_unlock(&cd->lock); 592 return ret; 593 } 594 595 static unsigned int sr_block_check_events(struct gendisk *disk, 596 unsigned int clearing) 597 { 598 unsigned int ret = 0; 599 struct scsi_cd *cd; 600 601 cd = scsi_cd_get(disk); 602 if (!cd) 603 return 0; 604 605 if (!atomic_read(&cd->device->disk_events_disable_depth)) 606 ret = cdrom_check_events(&cd->cdi, clearing); 607 608 scsi_cd_put(cd); 609 return ret; 610 } 611 612 static const struct block_device_operations sr_bdops = 613 { 614 .owner = THIS_MODULE, 615 .open = sr_block_open, 616 .release = sr_block_release, 617 .ioctl = sr_block_ioctl, 618 .compat_ioctl = blkdev_compat_ptr_ioctl, 619 .check_events = sr_block_check_events, 620 }; 621 622 static int sr_open(struct cdrom_device_info *cdi, int purpose) 623 { 624 struct scsi_cd *cd = cdi->handle; 625 struct scsi_device *sdev = cd->device; 626 int retval; 627 628 /* 629 * If the device is in error recovery, wait until it is done. 630 * If the device is offline, then disallow any access to it. 631 */ 632 retval = -ENXIO; 633 if (!scsi_block_when_processing_errors(sdev)) 634 goto error_out; 635 636 return 0; 637 638 error_out: 639 return retval; 640 } 641 642 static void sr_release(struct cdrom_device_info *cdi) 643 { 644 } 645 646 static int sr_probe(struct device *dev) 647 { 648 struct scsi_device *sdev = to_scsi_device(dev); 649 struct gendisk *disk; 650 struct scsi_cd *cd; 651 int minor, error; 652 653 scsi_autopm_get_device(sdev); 654 error = -ENODEV; 655 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 656 goto fail; 657 658 error = -ENOMEM; 659 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 660 if (!cd) 661 goto fail; 662 663 kref_init(&cd->kref); 664 665 disk = __alloc_disk_node(sdev->request_queue, NUMA_NO_NODE, 666 &sr_bio_compl_lkclass); 667 if (!disk) 668 goto fail_free; 669 mutex_init(&cd->lock); 670 671 spin_lock(&sr_index_lock); 672 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 673 if (minor == SR_DISKS) { 674 spin_unlock(&sr_index_lock); 675 error = -EBUSY; 676 goto fail_put; 677 } 678 __set_bit(minor, sr_index_bits); 679 spin_unlock(&sr_index_lock); 680 681 disk->major = SCSI_CDROM_MAJOR; 682 disk->first_minor = minor; 683 disk->minors = 1; 684 sprintf(disk->disk_name, "sr%d", minor); 685 disk->fops = &sr_bdops; 686 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 687 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 688 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; 689 690 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 691 692 cd->device = sdev; 693 cd->disk = disk; 694 cd->driver = &sr_template; 695 cd->disk = disk; 696 cd->capacity = 0x1fffff; 697 cd->device->changed = 1; /* force recheck CD type */ 698 cd->media_present = 1; 699 cd->use = 1; 700 cd->readcd_known = 0; 701 cd->readcd_cdda = 0; 702 703 cd->cdi.ops = &sr_dops; 704 cd->cdi.handle = cd; 705 cd->cdi.mask = 0; 706 cd->cdi.capacity = 1; 707 sprintf(cd->cdi.name, "sr%d", minor); 708 709 sdev->sector_size = 2048; /* A guess, just in case */ 710 711 /* FIXME: need to handle a get_capabilities failure properly ?? */ 712 get_capabilities(cd); 713 sr_vendor_init(cd); 714 715 set_capacity(disk, cd->capacity); 716 disk->private_data = &cd->driver; 717 718 if (register_cdrom(disk, &cd->cdi)) 719 goto fail_minor; 720 721 /* 722 * Initialize block layer runtime PM stuffs before the 723 * periodic event checking request gets started in add_disk. 724 */ 725 blk_pm_runtime_init(sdev->request_queue, dev); 726 727 dev_set_drvdata(dev, cd); 728 disk->flags |= GENHD_FL_REMOVABLE; 729 sr_revalidate_disk(cd); 730 device_add_disk(&sdev->sdev_gendev, disk, NULL); 731 732 sdev_printk(KERN_DEBUG, sdev, 733 "Attached scsi CD-ROM %s\n", cd->cdi.name); 734 scsi_autopm_put_device(cd->device); 735 736 return 0; 737 738 fail_minor: 739 spin_lock(&sr_index_lock); 740 clear_bit(minor, sr_index_bits); 741 spin_unlock(&sr_index_lock); 742 fail_put: 743 put_disk(disk); 744 mutex_destroy(&cd->lock); 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 + get_unaligned_be32(&buffer[0]); 783 /* 784 * READ_CAPACITY doesn't return the correct size on 785 * certain UDF media. If last_written is larger, use 786 * it instead. 787 * 788 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 789 */ 790 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 791 cd->capacity = max_t(long, cd->capacity, last_written); 792 793 sector_size = get_unaligned_be32(&buffer[4]); 794 switch (sector_size) { 795 /* 796 * HP 4020i CD-Recorder reports 2340 byte sectors 797 * Philips CD-Writers report 2352 byte sectors 798 * 799 * Use 2k sectors for them.. 800 */ 801 case 0: 802 case 2340: 803 case 2352: 804 sector_size = 2048; 805 fallthrough; 806 case 2048: 807 cd->capacity *= 4; 808 fallthrough; 809 case 512: 810 break; 811 default: 812 sr_printk(KERN_INFO, cd, 813 "unsupported sector size %d.", sector_size); 814 cd->capacity = 0; 815 } 816 817 cd->device->sector_size = sector_size; 818 819 /* 820 * Add this so that we have the ability to correctly gauge 821 * what the device is capable of. 822 */ 823 set_capacity(cd->disk, cd->capacity); 824 } 825 826 queue = cd->device->request_queue; 827 blk_queue_logical_block_size(queue, sector_size); 828 829 return; 830 } 831 832 static void get_capabilities(struct scsi_cd *cd) 833 { 834 unsigned char *buffer; 835 struct scsi_mode_data data; 836 struct scsi_sense_hdr sshdr; 837 unsigned int ms_len = 128; 838 int rc, n; 839 840 static const char *loadmech[] = 841 { 842 "caddy", 843 "tray", 844 "pop-up", 845 "", 846 "changer", 847 "cartridge changer", 848 "", 849 "" 850 }; 851 852 853 /* allocate transfer buffer */ 854 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 855 if (!buffer) { 856 sr_printk(KERN_ERR, cd, "out of memory.\n"); 857 return; 858 } 859 860 /* eat unit attentions */ 861 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 862 863 /* ask for mode page 0x2a */ 864 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 865 SR_TIMEOUT, 3, &data, NULL); 866 867 if (rc < 0 || data.length > ms_len || 868 data.header_length + data.block_descriptor_length > data.length) { 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 = get_unaligned_be16(&buffer[n + 8]) / 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 get_unaligned_be16(&buffer[n + 14]) / 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 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 960 u32 lba, u32 nr, u8 *last_sense) 961 { 962 struct gendisk *disk = cdi->disk; 963 u32 len = nr * CD_FRAMESIZE_RAW; 964 struct scsi_request *req; 965 struct request *rq; 966 struct bio *bio; 967 int ret; 968 969 rq = blk_get_request(disk->queue, REQ_OP_DRV_IN, 0); 970 if (IS_ERR(rq)) 971 return PTR_ERR(rq); 972 req = scsi_req(rq); 973 974 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL); 975 if (ret) 976 goto out_put_request; 977 978 req->cmd[0] = GPCMD_READ_CD; 979 req->cmd[1] = 1 << 2; 980 req->cmd[2] = (lba >> 24) & 0xff; 981 req->cmd[3] = (lba >> 16) & 0xff; 982 req->cmd[4] = (lba >> 8) & 0xff; 983 req->cmd[5] = lba & 0xff; 984 req->cmd[6] = (nr >> 16) & 0xff; 985 req->cmd[7] = (nr >> 8) & 0xff; 986 req->cmd[8] = nr & 0xff; 987 req->cmd[9] = 0xf8; 988 req->cmd_len = 12; 989 rq->timeout = 60 * HZ; 990 bio = rq->bio; 991 992 blk_execute_rq(disk, rq, 0); 993 if (scsi_req(rq)->result) { 994 struct scsi_sense_hdr sshdr; 995 996 scsi_normalize_sense(req->sense, req->sense_len, 997 &sshdr); 998 *last_sense = sshdr.sense_key; 999 ret = -EIO; 1000 } 1001 1002 if (blk_rq_unmap_user(bio)) 1003 ret = -EFAULT; 1004 out_put_request: 1005 blk_put_request(rq); 1006 return ret; 1007 } 1008 1009 1010 /** 1011 * sr_kref_release - Called to free the scsi_cd structure 1012 * @kref: pointer to embedded kref 1013 * 1014 * sr_ref_mutex must be held entering this routine. Because it is 1015 * called on last put, you should always use the scsi_cd_get() 1016 * scsi_cd_put() helpers which manipulate the semaphore directly 1017 * and never do a direct kref_put(). 1018 **/ 1019 static void sr_kref_release(struct kref *kref) 1020 { 1021 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 1022 struct gendisk *disk = cd->disk; 1023 1024 spin_lock(&sr_index_lock); 1025 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 1026 spin_unlock(&sr_index_lock); 1027 1028 unregister_cdrom(&cd->cdi); 1029 1030 disk->private_data = NULL; 1031 1032 put_disk(disk); 1033 1034 mutex_destroy(&cd->lock); 1035 1036 kfree(cd); 1037 } 1038 1039 static int sr_remove(struct device *dev) 1040 { 1041 struct scsi_cd *cd = dev_get_drvdata(dev); 1042 1043 scsi_autopm_get_device(cd->device); 1044 1045 del_gendisk(cd->disk); 1046 dev_set_drvdata(dev, NULL); 1047 1048 mutex_lock(&sr_ref_mutex); 1049 kref_put(&cd->kref, sr_kref_release); 1050 mutex_unlock(&sr_ref_mutex); 1051 1052 return 0; 1053 } 1054 1055 static int __init init_sr(void) 1056 { 1057 int rc; 1058 1059 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1060 if (rc) 1061 return rc; 1062 rc = scsi_register_driver(&sr_template.gendrv); 1063 if (rc) 1064 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1065 1066 return rc; 1067 } 1068 1069 static void __exit exit_sr(void) 1070 { 1071 scsi_unregister_driver(&sr_template.gendrv); 1072 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1073 } 1074 1075 module_init(init_sr); 1076 module_exit(exit_sr); 1077 MODULE_LICENSE("GPL"); 1078