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/major.h> 48 #include <linux/blkdev.h> 49 #include <linux/blk-pm.h> 50 #include <linux/mutex.h> 51 #include <linux/slab.h> 52 #include <linux/pm_runtime.h> 53 #include <linux/uaccess.h> 54 55 #include <asm/unaligned.h> 56 57 #include <scsi/scsi.h> 58 #include <scsi/scsi_dbg.h> 59 #include <scsi/scsi_device.h> 60 #include <scsi/scsi_driver.h> 61 #include <scsi/scsi_cmnd.h> 62 #include <scsi/scsi_eh.h> 63 #include <scsi/scsi_host.h> 64 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 65 66 #include "scsi_logging.h" 67 #include "sr.h" 68 69 70 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 71 MODULE_LICENSE("GPL"); 72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 73 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 74 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 75 76 #define SR_DISKS 256 77 78 #define SR_CAPABILITIES \ 79 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 80 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 81 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 82 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 83 CDC_MRW|CDC_MRW_W|CDC_RAM) 84 85 static int sr_probe(struct device *); 86 static int sr_remove(struct device *); 87 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); 88 static int sr_done(struct scsi_cmnd *); 89 static int sr_runtime_suspend(struct device *dev); 90 91 static const struct dev_pm_ops sr_pm_ops = { 92 .runtime_suspend = sr_runtime_suspend, 93 }; 94 95 static struct scsi_driver sr_template = { 96 .gendrv = { 97 .name = "sr", 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 static int sr_open(struct cdrom_device_info *, int); 112 static void sr_release(struct cdrom_device_info *); 113 114 static void get_sectorsize(struct scsi_cd *); 115 static int get_capabilities(struct scsi_cd *); 116 117 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 118 unsigned int clearing, int slot); 119 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 120 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 121 u32 lba, u32 nr, u8 *last_sense); 122 123 static const struct cdrom_device_ops sr_dops = { 124 .open = sr_open, 125 .release = sr_release, 126 .drive_status = sr_drive_status, 127 .check_events = sr_check_events, 128 .tray_move = sr_tray_move, 129 .lock_door = sr_lock_door, 130 .select_speed = sr_select_speed, 131 .get_last_session = sr_get_last_session, 132 .get_mcn = sr_get_mcn, 133 .reset = sr_reset, 134 .audio_ioctl = sr_audio_ioctl, 135 .generic_packet = sr_packet, 136 .read_cdda_bpc = sr_read_cdda_bpc, 137 .capability = SR_CAPABILITIES, 138 }; 139 140 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 141 { 142 return disk->private_data; 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 static unsigned int sr_get_events(struct scsi_device *sdev) 159 { 160 u8 buf[8]; 161 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 162 1, /* polled */ 163 0, 0, /* reserved */ 164 1 << 4, /* notification class: media */ 165 0, 0, /* reserved */ 166 0, sizeof(buf), /* allocation length */ 167 0, /* control */ 168 }; 169 struct event_header *eh = (void *)buf; 170 struct media_event_desc *med = (void *)(buf + 4); 171 struct scsi_sense_hdr sshdr; 172 const struct scsi_exec_args exec_args = { 173 .sshdr = &sshdr, 174 }; 175 int result; 176 177 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buf, sizeof(buf), 178 SR_TIMEOUT, MAX_RETRIES, &exec_args); 179 if (result > 0 && scsi_sense_valid(&sshdr) && 180 sshdr.sense_key == UNIT_ATTENTION) 181 return DISK_EVENT_MEDIA_CHANGE; 182 183 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 184 return 0; 185 186 if (eh->nea || eh->notification_class != 0x4) 187 return 0; 188 189 if (med->media_event_code == 1) 190 return DISK_EVENT_EJECT_REQUEST; 191 else if (med->media_event_code == 2) 192 return DISK_EVENT_MEDIA_CHANGE; 193 else if (med->media_event_code == 3) 194 return DISK_EVENT_MEDIA_CHANGE; 195 return 0; 196 } 197 198 /* 199 * This function checks to see if the media has been changed or eject 200 * button has been pressed. It is possible that we have already 201 * sensed a change, or the drive may have sensed one and not yet 202 * reported it. The past events are accumulated in sdev->changed and 203 * returned together with the current state. 204 */ 205 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 206 unsigned int clearing, int slot) 207 { 208 struct scsi_cd *cd = cdi->handle; 209 bool last_present; 210 struct scsi_sense_hdr sshdr; 211 unsigned int events; 212 int ret; 213 214 /* no changer support */ 215 if (CDSL_CURRENT != slot) 216 return 0; 217 218 events = sr_get_events(cd->device); 219 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 220 221 /* 222 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 223 * for several times in a row. We rely on TUR only for this likely 224 * broken device, to prevent generating incorrect media changed 225 * events for every open(). 226 */ 227 if (cd->ignore_get_event) { 228 events &= ~DISK_EVENT_MEDIA_CHANGE; 229 goto do_tur; 230 } 231 232 /* 233 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 234 * is being cleared. Note that there are devices which hang 235 * if asked to execute TUR repeatedly. 236 */ 237 if (cd->device->changed) { 238 events |= DISK_EVENT_MEDIA_CHANGE; 239 cd->device->changed = 0; 240 cd->tur_changed = true; 241 } 242 243 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 244 return events; 245 do_tur: 246 /* let's see whether the media is there with TUR */ 247 last_present = cd->media_present; 248 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 249 250 /* 251 * Media is considered to be present if TUR succeeds or fails with 252 * sense data indicating something other than media-not-present 253 * (ASC 0x3a). 254 */ 255 cd->media_present = scsi_status_is_good(ret) || 256 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 257 258 if (last_present != cd->media_present) 259 cd->device->changed = 1; 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 (cd->ignore_get_event) 268 return events; 269 270 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 271 if (!cd->tur_changed) { 272 if (cd->get_event_changed) { 273 if (cd->tur_mismatch++ > 8) { 274 sr_printk(KERN_WARNING, cd, 275 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 276 cd->ignore_get_event = true; 277 } 278 } else { 279 cd->tur_mismatch = 0; 280 } 281 } 282 cd->tur_changed = false; 283 cd->get_event_changed = false; 284 285 return events; 286 } 287 288 /* 289 * sr_done is the interrupt routine for the device driver. 290 * 291 * It will be notified on the end of a SCSI read / write, and will take one 292 * of several actions based on success or failure. 293 */ 294 static int sr_done(struct scsi_cmnd *SCpnt) 295 { 296 int result = SCpnt->result; 297 int this_count = scsi_bufflen(SCpnt); 298 int good_bytes = (result == 0 ? this_count : 0); 299 int block_sectors = 0; 300 long error_sector; 301 struct request *rq = scsi_cmd_to_rq(SCpnt); 302 struct scsi_cd *cd = scsi_cd(rq->q->disk); 303 304 #ifdef DEBUG 305 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 306 #endif 307 308 /* 309 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 310 * success. Since this is a relatively rare error condition, no 311 * care is taken to avoid unnecessary additional work such as 312 * memcpy's that could be avoided. 313 */ 314 if (scsi_status_is_check_condition(result) && 315 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 316 switch (SCpnt->sense_buffer[2]) { 317 case MEDIUM_ERROR: 318 case VOLUME_OVERFLOW: 319 case ILLEGAL_REQUEST: 320 if (!(SCpnt->sense_buffer[0] & 0x90)) 321 break; 322 error_sector = 323 get_unaligned_be32(&SCpnt->sense_buffer[3]); 324 if (rq->bio != NULL) 325 block_sectors = bio_sectors(rq->bio); 326 if (block_sectors < 4) 327 block_sectors = 4; 328 if (cd->device->sector_size == 2048) 329 error_sector <<= 2; 330 error_sector &= ~(block_sectors - 1); 331 good_bytes = (error_sector - blk_rq_pos(rq)) << 9; 332 if (good_bytes < 0 || good_bytes >= this_count) 333 good_bytes = 0; 334 /* 335 * The SCSI specification allows for the value 336 * returned by READ CAPACITY to be up to 75 2K 337 * sectors past the last readable block. 338 * Therefore, if we hit a medium error within the 339 * last 75 2K sectors, we decrease the saved size 340 * value. 341 */ 342 if (error_sector < get_capacity(cd->disk) && 343 cd->capacity - error_sector < 4 * 75) 344 set_capacity(cd->disk, error_sector); 345 break; 346 347 case RECOVERED_ERROR: 348 good_bytes = this_count; 349 break; 350 351 default: 352 break; 353 } 354 } 355 356 return good_bytes; 357 } 358 359 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) 360 { 361 int block = 0, this_count, s_size; 362 struct scsi_cd *cd; 363 struct request *rq = scsi_cmd_to_rq(SCpnt); 364 blk_status_t ret; 365 366 ret = scsi_alloc_sgtables(SCpnt); 367 if (ret != BLK_STS_OK) 368 return ret; 369 cd = scsi_cd(rq->q->disk); 370 371 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 372 "Doing sr request, block = %d\n", block)); 373 374 if (!cd->device || !scsi_device_online(cd->device)) { 375 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 376 "Finishing %u sectors\n", blk_rq_sectors(rq))); 377 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 378 "Retry with 0x%p\n", SCpnt)); 379 goto out; 380 } 381 382 if (cd->device->changed) { 383 /* 384 * quietly refuse to do anything to a changed disc until the 385 * changed bit has been reset 386 */ 387 goto out; 388 } 389 390 s_size = cd->device->sector_size; 391 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 392 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 393 goto out; 394 } 395 396 switch (req_op(rq)) { 397 case REQ_OP_WRITE: 398 if (!cd->writeable) 399 goto out; 400 SCpnt->cmnd[0] = WRITE_10; 401 cd->cdi.media_written = 1; 402 break; 403 case REQ_OP_READ: 404 SCpnt->cmnd[0] = READ_10; 405 break; 406 default: 407 blk_dump_rq_flags(rq, "Unknown sr command"); 408 goto out; 409 } 410 411 { 412 struct scatterlist *sg; 413 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 414 415 scsi_for_each_sg(SCpnt, sg, sg_count, i) 416 size += sg->length; 417 418 if (size != scsi_bufflen(SCpnt)) { 419 scmd_printk(KERN_ERR, SCpnt, 420 "mismatch count %d, bytes %d\n", 421 size, scsi_bufflen(SCpnt)); 422 if (scsi_bufflen(SCpnt) > size) 423 SCpnt->sdb.length = size; 424 } 425 } 426 427 /* 428 * request doesn't start on hw block boundary, add scatter pads 429 */ 430 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 431 (scsi_bufflen(SCpnt) % s_size)) { 432 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 433 goto out; 434 } 435 436 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 437 438 439 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 440 "%s %d/%u 512 byte blocks.\n", 441 (rq_data_dir(rq) == WRITE) ? 442 "writing" : "reading", 443 this_count, blk_rq_sectors(rq))); 444 445 SCpnt->cmnd[1] = 0; 446 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 447 448 if (this_count > 0xffff) { 449 this_count = 0xffff; 450 SCpnt->sdb.length = this_count * s_size; 451 } 452 453 put_unaligned_be32(block, &SCpnt->cmnd[2]); 454 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 455 put_unaligned_be16(this_count, &SCpnt->cmnd[7]); 456 457 /* 458 * We shouldn't disconnect in the middle of a sector, so with a dumb 459 * host adapter, it's safe to assume that we can at least transfer 460 * this many bytes between each connect / disconnect. 461 */ 462 SCpnt->transfersize = cd->device->sector_size; 463 SCpnt->underflow = this_count << 9; 464 SCpnt->allowed = MAX_RETRIES; 465 SCpnt->cmd_len = 10; 466 467 /* 468 * This indicates that the command is ready from our end to be queued. 469 */ 470 return BLK_STS_OK; 471 out: 472 scsi_free_sgtables(SCpnt); 473 return BLK_STS_IOERR; 474 } 475 476 static void sr_revalidate_disk(struct scsi_cd *cd) 477 { 478 struct scsi_sense_hdr sshdr; 479 480 /* if the unit is not ready, nothing more to do */ 481 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 482 return; 483 sr_cd_check(&cd->cdi); 484 get_sectorsize(cd); 485 } 486 487 static int sr_block_open(struct gendisk *disk, blk_mode_t mode) 488 { 489 struct scsi_cd *cd = scsi_cd(disk); 490 struct scsi_device *sdev = cd->device; 491 int ret; 492 493 if (scsi_device_get(cd->device)) 494 return -ENXIO; 495 496 scsi_autopm_get_device(sdev); 497 if (disk_check_media_change(disk)) 498 sr_revalidate_disk(cd); 499 500 mutex_lock(&cd->lock); 501 ret = cdrom_open(&cd->cdi, mode); 502 mutex_unlock(&cd->lock); 503 504 scsi_autopm_put_device(sdev); 505 if (ret) 506 scsi_device_put(cd->device); 507 return ret; 508 } 509 510 static void sr_block_release(struct gendisk *disk) 511 { 512 struct scsi_cd *cd = scsi_cd(disk); 513 514 mutex_lock(&cd->lock); 515 cdrom_release(&cd->cdi); 516 mutex_unlock(&cd->lock); 517 518 scsi_device_put(cd->device); 519 } 520 521 static int sr_block_ioctl(struct block_device *bdev, blk_mode_t mode, 522 unsigned cmd, unsigned long arg) 523 { 524 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 525 struct scsi_device *sdev = cd->device; 526 void __user *argp = (void __user *)arg; 527 int ret; 528 529 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO)) 530 return -ENOIOCTLCMD; 531 532 mutex_lock(&cd->lock); 533 534 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 535 (mode & BLK_OPEN_NDELAY)); 536 if (ret) 537 goto out; 538 539 scsi_autopm_get_device(sdev); 540 541 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) { 542 ret = cdrom_ioctl(&cd->cdi, bdev, cmd, arg); 543 if (ret != -ENOSYS) 544 goto put; 545 } 546 ret = scsi_ioctl(sdev, mode & BLK_OPEN_WRITE, cmd, argp); 547 548 put: 549 scsi_autopm_put_device(sdev); 550 out: 551 mutex_unlock(&cd->lock); 552 return ret; 553 } 554 555 static unsigned int sr_block_check_events(struct gendisk *disk, 556 unsigned int clearing) 557 { 558 struct scsi_cd *cd = disk->private_data; 559 560 if (atomic_read(&cd->device->disk_events_disable_depth)) 561 return 0; 562 return cdrom_check_events(&cd->cdi, clearing); 563 } 564 565 static void sr_free_disk(struct gendisk *disk) 566 { 567 struct scsi_cd *cd = disk->private_data; 568 569 spin_lock(&sr_index_lock); 570 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 571 spin_unlock(&sr_index_lock); 572 573 unregister_cdrom(&cd->cdi); 574 mutex_destroy(&cd->lock); 575 kfree(cd); 576 } 577 578 static const struct block_device_operations sr_bdops = 579 { 580 .owner = THIS_MODULE, 581 .open = sr_block_open, 582 .release = sr_block_release, 583 .ioctl = sr_block_ioctl, 584 .compat_ioctl = blkdev_compat_ptr_ioctl, 585 .check_events = sr_block_check_events, 586 .free_disk = sr_free_disk, 587 }; 588 589 static int sr_open(struct cdrom_device_info *cdi, int purpose) 590 { 591 struct scsi_cd *cd = cdi->handle; 592 struct scsi_device *sdev = cd->device; 593 594 /* 595 * If the device is in error recovery, wait until it is done. 596 * If the device is offline, then disallow any access to it. 597 */ 598 if (!scsi_block_when_processing_errors(sdev)) 599 return -ENXIO; 600 601 return 0; 602 } 603 604 static void sr_release(struct cdrom_device_info *cdi) 605 { 606 } 607 608 static int sr_probe(struct device *dev) 609 { 610 struct scsi_device *sdev = to_scsi_device(dev); 611 struct gendisk *disk; 612 struct scsi_cd *cd; 613 int minor, error; 614 615 scsi_autopm_get_device(sdev); 616 error = -ENODEV; 617 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 618 goto fail; 619 620 error = -ENOMEM; 621 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 622 if (!cd) 623 goto fail; 624 625 disk = blk_mq_alloc_disk_for_queue(sdev->request_queue, 626 &sr_bio_compl_lkclass); 627 if (!disk) 628 goto fail_free; 629 mutex_init(&cd->lock); 630 631 spin_lock(&sr_index_lock); 632 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 633 if (minor == SR_DISKS) { 634 spin_unlock(&sr_index_lock); 635 error = -EBUSY; 636 goto fail_put; 637 } 638 __set_bit(minor, sr_index_bits); 639 spin_unlock(&sr_index_lock); 640 641 disk->major = SCSI_CDROM_MAJOR; 642 disk->first_minor = minor; 643 disk->minors = 1; 644 sprintf(disk->disk_name, "sr%d", minor); 645 disk->fops = &sr_bdops; 646 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; 647 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 648 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT | 649 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE; 650 651 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 652 653 cd->device = sdev; 654 cd->disk = disk; 655 cd->capacity = 0x1fffff; 656 cd->device->changed = 1; /* force recheck CD type */ 657 cd->media_present = 1; 658 cd->use = 1; 659 cd->readcd_known = 0; 660 cd->readcd_cdda = 0; 661 662 cd->cdi.ops = &sr_dops; 663 cd->cdi.handle = cd; 664 cd->cdi.mask = 0; 665 cd->cdi.capacity = 1; 666 sprintf(cd->cdi.name, "sr%d", minor); 667 668 sdev->sector_size = 2048; /* A guess, just in case */ 669 670 error = -ENOMEM; 671 if (get_capabilities(cd)) 672 goto fail_minor; 673 sr_vendor_init(cd); 674 675 set_capacity(disk, cd->capacity); 676 disk->private_data = cd; 677 678 if (register_cdrom(disk, &cd->cdi)) 679 goto fail_minor; 680 681 /* 682 * Initialize block layer runtime PM stuffs before the 683 * periodic event checking request gets started in add_disk. 684 */ 685 blk_pm_runtime_init(sdev->request_queue, dev); 686 687 dev_set_drvdata(dev, cd); 688 sr_revalidate_disk(cd); 689 690 error = device_add_disk(&sdev->sdev_gendev, disk, NULL); 691 if (error) 692 goto unregister_cdrom; 693 694 sdev_printk(KERN_DEBUG, sdev, 695 "Attached scsi CD-ROM %s\n", cd->cdi.name); 696 scsi_autopm_put_device(cd->device); 697 698 return 0; 699 700 unregister_cdrom: 701 unregister_cdrom(&cd->cdi); 702 fail_minor: 703 spin_lock(&sr_index_lock); 704 clear_bit(minor, sr_index_bits); 705 spin_unlock(&sr_index_lock); 706 fail_put: 707 put_disk(disk); 708 mutex_destroy(&cd->lock); 709 fail_free: 710 kfree(cd); 711 fail: 712 scsi_autopm_put_device(sdev); 713 return error; 714 } 715 716 717 static void get_sectorsize(struct scsi_cd *cd) 718 { 719 static const u8 cmd[10] = { READ_CAPACITY }; 720 unsigned char buffer[8] = { }; 721 int the_result; 722 int sector_size; 723 struct request_queue *queue; 724 struct scsi_failure failure_defs[] = { 725 { 726 .result = SCMD_FAILURE_RESULT_ANY, 727 .allowed = 3, 728 }, 729 {} 730 }; 731 struct scsi_failures failures = { 732 .failure_definitions = failure_defs, 733 }; 734 const struct scsi_exec_args exec_args = { 735 .failures = &failures, 736 }; 737 738 /* Do the command and wait.. */ 739 the_result = scsi_execute_cmd(cd->device, cmd, REQ_OP_DRV_IN, buffer, 740 sizeof(buffer), SR_TIMEOUT, MAX_RETRIES, 741 &exec_args); 742 if (the_result) { 743 cd->capacity = 0x1fffff; 744 sector_size = 2048; /* A guess, just in case */ 745 } else { 746 long last_written; 747 748 cd->capacity = 1 + get_unaligned_be32(&buffer[0]); 749 /* 750 * READ_CAPACITY doesn't return the correct size on 751 * certain UDF media. If last_written is larger, use 752 * it instead. 753 * 754 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 755 */ 756 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 757 cd->capacity = max_t(long, cd->capacity, last_written); 758 759 sector_size = get_unaligned_be32(&buffer[4]); 760 switch (sector_size) { 761 /* 762 * HP 4020i CD-Recorder reports 2340 byte sectors 763 * Philips CD-Writers report 2352 byte sectors 764 * 765 * Use 2k sectors for them.. 766 */ 767 case 0: 768 case 2340: 769 case 2352: 770 sector_size = 2048; 771 fallthrough; 772 case 2048: 773 cd->capacity *= 4; 774 fallthrough; 775 case 512: 776 break; 777 default: 778 sr_printk(KERN_INFO, cd, 779 "unsupported sector size %d.", sector_size); 780 cd->capacity = 0; 781 } 782 783 cd->device->sector_size = sector_size; 784 785 /* 786 * Add this so that we have the ability to correctly gauge 787 * what the device is capable of. 788 */ 789 set_capacity(cd->disk, cd->capacity); 790 } 791 792 queue = cd->device->request_queue; 793 blk_queue_logical_block_size(queue, sector_size); 794 795 return; 796 } 797 798 static int get_capabilities(struct scsi_cd *cd) 799 { 800 unsigned char *buffer; 801 struct scsi_mode_data data; 802 struct scsi_sense_hdr sshdr; 803 unsigned int ms_len = 128; 804 int rc, n; 805 806 static const char *loadmech[] = 807 { 808 "caddy", 809 "tray", 810 "pop-up", 811 "", 812 "changer", 813 "cartridge changer", 814 "", 815 "" 816 }; 817 818 819 /* allocate transfer buffer */ 820 buffer = kmalloc(512, GFP_KERNEL); 821 if (!buffer) { 822 sr_printk(KERN_ERR, cd, "out of memory.\n"); 823 return -ENOMEM; 824 } 825 826 /* eat unit attentions */ 827 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 828 829 /* ask for mode page 0x2a */ 830 rc = scsi_mode_sense(cd->device, 0, 0x2a, 0, buffer, ms_len, 831 SR_TIMEOUT, 3, &data, NULL); 832 833 if (rc < 0 || data.length > ms_len || 834 data.header_length + data.block_descriptor_length > data.length) { 835 /* failed, drive doesn't have capabilities mode page */ 836 cd->cdi.speed = 1; 837 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 838 CDC_DVD | CDC_DVD_RAM | 839 CDC_SELECT_DISC | CDC_SELECT_SPEED | 840 CDC_MRW | CDC_MRW_W | CDC_RAM); 841 kfree(buffer); 842 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 843 return 0; 844 } 845 846 n = data.header_length + data.block_descriptor_length; 847 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; 848 cd->readcd_known = 1; 849 cd->readcd_cdda = buffer[n + 5] & 0x01; 850 /* print some capability bits */ 851 sr_printk(KERN_INFO, cd, 852 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 853 get_unaligned_be16(&buffer[n + 14]) / 176, 854 cd->cdi.speed, 855 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 856 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 857 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 858 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 859 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 860 loadmech[buffer[n + 6] >> 5]); 861 if ((buffer[n + 6] >> 5) == 0) 862 /* caddy drives can't close tray... */ 863 cd->cdi.mask |= CDC_CLOSE_TRAY; 864 if ((buffer[n + 2] & 0x8) == 0) 865 /* not a DVD drive */ 866 cd->cdi.mask |= CDC_DVD; 867 if ((buffer[n + 3] & 0x20) == 0) 868 /* can't write DVD-RAM media */ 869 cd->cdi.mask |= CDC_DVD_RAM; 870 if ((buffer[n + 3] & 0x10) == 0) 871 /* can't write DVD-R media */ 872 cd->cdi.mask |= CDC_DVD_R; 873 if ((buffer[n + 3] & 0x2) == 0) 874 /* can't write CD-RW media */ 875 cd->cdi.mask |= CDC_CD_RW; 876 if ((buffer[n + 3] & 0x1) == 0) 877 /* can't write CD-R media */ 878 cd->cdi.mask |= CDC_CD_R; 879 if ((buffer[n + 6] & 0x8) == 0) 880 /* can't eject */ 881 cd->cdi.mask |= CDC_OPEN_TRAY; 882 883 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 884 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 885 cd->cdi.capacity = 886 cdrom_number_of_slots(&cd->cdi); 887 if (cd->cdi.capacity <= 1) 888 /* not a changer */ 889 cd->cdi.mask |= CDC_SELECT_DISC; 890 /*else I don't think it can close its tray 891 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 892 893 /* 894 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 895 */ 896 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 897 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 898 cd->writeable = 1; 899 } 900 901 kfree(buffer); 902 return 0; 903 } 904 905 /* 906 * sr_packet() is the entry point for the generic commands generated 907 * by the Uniform CD-ROM layer. 908 */ 909 static int sr_packet(struct cdrom_device_info *cdi, 910 struct packet_command *cgc) 911 { 912 struct scsi_cd *cd = cdi->handle; 913 struct scsi_device *sdev = cd->device; 914 915 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 916 return -EDRIVE_CANT_DO_THIS; 917 918 if (cgc->timeout <= 0) 919 cgc->timeout = IOCTL_TIMEOUT; 920 921 sr_do_ioctl(cd, cgc); 922 923 return cgc->stat; 924 } 925 926 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 927 u32 lba, u32 nr, u8 *last_sense) 928 { 929 struct gendisk *disk = cdi->disk; 930 u32 len = nr * CD_FRAMESIZE_RAW; 931 struct scsi_cmnd *scmd; 932 struct request *rq; 933 struct bio *bio; 934 int ret; 935 936 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0); 937 if (IS_ERR(rq)) 938 return PTR_ERR(rq); 939 scmd = blk_mq_rq_to_pdu(rq); 940 941 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL); 942 if (ret) 943 goto out_put_request; 944 945 scmd->cmnd[0] = GPCMD_READ_CD; 946 scmd->cmnd[1] = 1 << 2; 947 scmd->cmnd[2] = (lba >> 24) & 0xff; 948 scmd->cmnd[3] = (lba >> 16) & 0xff; 949 scmd->cmnd[4] = (lba >> 8) & 0xff; 950 scmd->cmnd[5] = lba & 0xff; 951 scmd->cmnd[6] = (nr >> 16) & 0xff; 952 scmd->cmnd[7] = (nr >> 8) & 0xff; 953 scmd->cmnd[8] = nr & 0xff; 954 scmd->cmnd[9] = 0xf8; 955 scmd->cmd_len = 12; 956 rq->timeout = 60 * HZ; 957 bio = rq->bio; 958 959 blk_execute_rq(rq, false); 960 if (scmd->result) { 961 struct scsi_sense_hdr sshdr; 962 963 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len, 964 &sshdr); 965 *last_sense = sshdr.sense_key; 966 ret = -EIO; 967 } 968 969 if (blk_rq_unmap_user(bio)) 970 ret = -EFAULT; 971 out_put_request: 972 blk_mq_free_request(rq); 973 return ret; 974 } 975 976 static int sr_remove(struct device *dev) 977 { 978 struct scsi_cd *cd = dev_get_drvdata(dev); 979 980 scsi_autopm_get_device(cd->device); 981 982 del_gendisk(cd->disk); 983 put_disk(cd->disk); 984 985 return 0; 986 } 987 988 static int __init init_sr(void) 989 { 990 int rc; 991 992 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 993 if (rc) 994 return rc; 995 rc = scsi_register_driver(&sr_template.gendrv); 996 if (rc) 997 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 998 999 return rc; 1000 } 1001 1002 static void __exit exit_sr(void) 1003 { 1004 scsi_unregister_driver(&sr_template.gendrv); 1005 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1006 } 1007 1008 module_init(init_sr); 1009 module_exit(exit_sr); 1010 MODULE_LICENSE("GPL"); 1011