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 int 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 int 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 0; 483 sr_cd_check(&cd->cdi); 484 return 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 ret = sr_revalidate_disk(cd); 499 if (ret) 500 goto out; 501 } 502 503 mutex_lock(&cd->lock); 504 ret = cdrom_open(&cd->cdi, mode); 505 mutex_unlock(&cd->lock); 506 out: 507 scsi_autopm_put_device(sdev); 508 if (ret) 509 scsi_device_put(cd->device); 510 return ret; 511 } 512 513 static void sr_block_release(struct gendisk *disk) 514 { 515 struct scsi_cd *cd = scsi_cd(disk); 516 517 mutex_lock(&cd->lock); 518 cdrom_release(&cd->cdi); 519 mutex_unlock(&cd->lock); 520 521 scsi_device_put(cd->device); 522 } 523 524 static int sr_block_ioctl(struct block_device *bdev, blk_mode_t mode, 525 unsigned cmd, unsigned long arg) 526 { 527 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 528 struct scsi_device *sdev = cd->device; 529 void __user *argp = (void __user *)arg; 530 int ret; 531 532 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO)) 533 return -ENOIOCTLCMD; 534 535 mutex_lock(&cd->lock); 536 537 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 538 (mode & BLK_OPEN_NDELAY)); 539 if (ret) 540 goto out; 541 542 scsi_autopm_get_device(sdev); 543 544 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) { 545 ret = cdrom_ioctl(&cd->cdi, bdev, cmd, arg); 546 if (ret != -ENOSYS) 547 goto put; 548 } 549 ret = scsi_ioctl(sdev, mode & BLK_OPEN_WRITE, cmd, argp); 550 551 put: 552 scsi_autopm_put_device(sdev); 553 out: 554 mutex_unlock(&cd->lock); 555 return ret; 556 } 557 558 static unsigned int sr_block_check_events(struct gendisk *disk, 559 unsigned int clearing) 560 { 561 struct scsi_cd *cd = disk->private_data; 562 563 if (atomic_read(&cd->device->disk_events_disable_depth)) 564 return 0; 565 return cdrom_check_events(&cd->cdi, clearing); 566 } 567 568 static void sr_free_disk(struct gendisk *disk) 569 { 570 struct scsi_cd *cd = disk->private_data; 571 572 spin_lock(&sr_index_lock); 573 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 574 spin_unlock(&sr_index_lock); 575 576 unregister_cdrom(&cd->cdi); 577 mutex_destroy(&cd->lock); 578 kfree(cd); 579 } 580 581 static const struct block_device_operations sr_bdops = 582 { 583 .owner = THIS_MODULE, 584 .open = sr_block_open, 585 .release = sr_block_release, 586 .ioctl = sr_block_ioctl, 587 .compat_ioctl = blkdev_compat_ptr_ioctl, 588 .check_events = sr_block_check_events, 589 .free_disk = sr_free_disk, 590 }; 591 592 static int sr_open(struct cdrom_device_info *cdi, int purpose) 593 { 594 struct scsi_cd *cd = cdi->handle; 595 struct scsi_device *sdev = cd->device; 596 597 /* 598 * If the device is in error recovery, wait until it is done. 599 * If the device is offline, then disallow any access to it. 600 */ 601 if (!scsi_block_when_processing_errors(sdev)) 602 return -ENXIO; 603 604 return 0; 605 } 606 607 static void sr_release(struct cdrom_device_info *cdi) 608 { 609 } 610 611 static int sr_probe(struct device *dev) 612 { 613 struct scsi_device *sdev = to_scsi_device(dev); 614 struct gendisk *disk; 615 struct scsi_cd *cd; 616 int minor, error; 617 618 scsi_autopm_get_device(sdev); 619 error = -ENODEV; 620 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 621 goto fail; 622 623 error = -ENOMEM; 624 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 625 if (!cd) 626 goto fail; 627 628 disk = blk_mq_alloc_disk_for_queue(sdev->request_queue, 629 &sr_bio_compl_lkclass); 630 if (!disk) 631 goto fail_free; 632 mutex_init(&cd->lock); 633 634 spin_lock(&sr_index_lock); 635 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 636 if (minor == SR_DISKS) { 637 spin_unlock(&sr_index_lock); 638 error = -EBUSY; 639 goto fail_put; 640 } 641 __set_bit(minor, sr_index_bits); 642 spin_unlock(&sr_index_lock); 643 644 disk->major = SCSI_CDROM_MAJOR; 645 disk->first_minor = minor; 646 disk->minors = 1; 647 sprintf(disk->disk_name, "sr%d", minor); 648 disk->fops = &sr_bdops; 649 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; 650 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 651 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT | 652 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE; 653 654 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 655 656 cd->device = sdev; 657 cd->disk = disk; 658 cd->capacity = 0x1fffff; 659 cd->device->changed = 1; /* force recheck CD type */ 660 cd->media_present = 1; 661 cd->use = 1; 662 cd->readcd_known = 0; 663 cd->readcd_cdda = 0; 664 665 cd->cdi.ops = &sr_dops; 666 cd->cdi.handle = cd; 667 cd->cdi.mask = 0; 668 cd->cdi.capacity = 1; 669 sprintf(cd->cdi.name, "sr%d", minor); 670 671 sdev->sector_size = 2048; /* A guess, just in case */ 672 673 error = -ENOMEM; 674 if (get_capabilities(cd)) 675 goto fail_minor; 676 sr_vendor_init(cd); 677 678 set_capacity(disk, cd->capacity); 679 disk->private_data = cd; 680 681 if (register_cdrom(disk, &cd->cdi)) 682 goto fail_minor; 683 684 /* 685 * Initialize block layer runtime PM stuffs before the 686 * periodic event checking request gets started in add_disk. 687 */ 688 blk_pm_runtime_init(sdev->request_queue, dev); 689 690 dev_set_drvdata(dev, cd); 691 error = sr_revalidate_disk(cd); 692 if (error) 693 goto unregister_cdrom; 694 695 error = device_add_disk(&sdev->sdev_gendev, disk, NULL); 696 if (error) 697 goto unregister_cdrom; 698 699 sdev_printk(KERN_DEBUG, sdev, 700 "Attached scsi CD-ROM %s\n", cd->cdi.name); 701 scsi_autopm_put_device(cd->device); 702 703 return 0; 704 705 unregister_cdrom: 706 unregister_cdrom(&cd->cdi); 707 fail_minor: 708 spin_lock(&sr_index_lock); 709 clear_bit(minor, sr_index_bits); 710 spin_unlock(&sr_index_lock); 711 fail_put: 712 put_disk(disk); 713 mutex_destroy(&cd->lock); 714 fail_free: 715 kfree(cd); 716 fail: 717 scsi_autopm_put_device(sdev); 718 return error; 719 } 720 721 722 static int get_sectorsize(struct scsi_cd *cd) 723 { 724 struct request_queue *q = cd->device->request_queue; 725 static const u8 cmd[10] = { READ_CAPACITY }; 726 unsigned char buffer[8] = { }; 727 struct queue_limits lim; 728 int err; 729 int sector_size; 730 struct scsi_failure failure_defs[] = { 731 { 732 .result = SCMD_FAILURE_RESULT_ANY, 733 .allowed = 3, 734 }, 735 {} 736 }; 737 struct scsi_failures failures = { 738 .failure_definitions = failure_defs, 739 }; 740 const struct scsi_exec_args exec_args = { 741 .failures = &failures, 742 }; 743 744 /* Do the command and wait.. */ 745 err = scsi_execute_cmd(cd->device, cmd, REQ_OP_DRV_IN, buffer, 746 sizeof(buffer), SR_TIMEOUT, MAX_RETRIES, 747 &exec_args); 748 if (err) { 749 cd->capacity = 0x1fffff; 750 sector_size = 2048; /* A guess, just in case */ 751 } else { 752 long last_written; 753 754 cd->capacity = 1 + get_unaligned_be32(&buffer[0]); 755 /* 756 * READ_CAPACITY doesn't return the correct size on 757 * certain UDF media. If last_written is larger, use 758 * it instead. 759 * 760 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 761 */ 762 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 763 cd->capacity = max_t(long, cd->capacity, last_written); 764 765 sector_size = get_unaligned_be32(&buffer[4]); 766 switch (sector_size) { 767 /* 768 * HP 4020i CD-Recorder reports 2340 byte sectors 769 * Philips CD-Writers report 2352 byte sectors 770 * 771 * Use 2k sectors for them.. 772 */ 773 case 0: 774 case 2340: 775 case 2352: 776 sector_size = 2048; 777 fallthrough; 778 case 2048: 779 cd->capacity *= 4; 780 fallthrough; 781 case 512: 782 break; 783 default: 784 sr_printk(KERN_INFO, cd, 785 "unsupported sector size %d.", sector_size); 786 cd->capacity = 0; 787 } 788 789 cd->device->sector_size = sector_size; 790 791 /* 792 * Add this so that we have the ability to correctly gauge 793 * what the device is capable of. 794 */ 795 set_capacity(cd->disk, cd->capacity); 796 } 797 798 lim = queue_limits_start_update(q); 799 lim.logical_block_size = sector_size; 800 blk_mq_freeze_queue(q); 801 err = queue_limits_commit_update(q, &lim); 802 blk_mq_unfreeze_queue(q); 803 return err; 804 } 805 806 static int get_capabilities(struct scsi_cd *cd) 807 { 808 unsigned char *buffer; 809 struct scsi_mode_data data; 810 struct scsi_sense_hdr sshdr; 811 unsigned int ms_len = 128; 812 int rc, n; 813 814 static const char *loadmech[] = 815 { 816 "caddy", 817 "tray", 818 "pop-up", 819 "", 820 "changer", 821 "cartridge changer", 822 "", 823 "" 824 }; 825 826 827 /* allocate transfer buffer */ 828 buffer = kmalloc(512, GFP_KERNEL); 829 if (!buffer) { 830 sr_printk(KERN_ERR, cd, "out of memory.\n"); 831 return -ENOMEM; 832 } 833 834 /* eat unit attentions */ 835 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 836 837 /* ask for mode page 0x2a */ 838 rc = scsi_mode_sense(cd->device, 0, 0x2a, 0, buffer, ms_len, 839 SR_TIMEOUT, 3, &data, NULL); 840 841 if (rc < 0 || data.length > ms_len || 842 data.header_length + data.block_descriptor_length > data.length) { 843 /* failed, drive doesn't have capabilities mode page */ 844 cd->cdi.speed = 1; 845 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 846 CDC_DVD | CDC_DVD_RAM | 847 CDC_SELECT_DISC | CDC_SELECT_SPEED | 848 CDC_MRW | CDC_MRW_W | CDC_RAM); 849 kfree(buffer); 850 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 851 return 0; 852 } 853 854 n = data.header_length + data.block_descriptor_length; 855 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; 856 cd->readcd_known = 1; 857 cd->readcd_cdda = buffer[n + 5] & 0x01; 858 /* print some capability bits */ 859 sr_printk(KERN_INFO, cd, 860 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 861 get_unaligned_be16(&buffer[n + 14]) / 176, 862 cd->cdi.speed, 863 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 864 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 865 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 866 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 867 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 868 loadmech[buffer[n + 6] >> 5]); 869 if ((buffer[n + 6] >> 5) == 0) 870 /* caddy drives can't close tray... */ 871 cd->cdi.mask |= CDC_CLOSE_TRAY; 872 if ((buffer[n + 2] & 0x8) == 0) 873 /* not a DVD drive */ 874 cd->cdi.mask |= CDC_DVD; 875 if ((buffer[n + 3] & 0x20) == 0) 876 /* can't write DVD-RAM media */ 877 cd->cdi.mask |= CDC_DVD_RAM; 878 if ((buffer[n + 3] & 0x10) == 0) 879 /* can't write DVD-R media */ 880 cd->cdi.mask |= CDC_DVD_R; 881 if ((buffer[n + 3] & 0x2) == 0) 882 /* can't write CD-RW media */ 883 cd->cdi.mask |= CDC_CD_RW; 884 if ((buffer[n + 3] & 0x1) == 0) 885 /* can't write CD-R media */ 886 cd->cdi.mask |= CDC_CD_R; 887 if ((buffer[n + 6] & 0x8) == 0) 888 /* can't eject */ 889 cd->cdi.mask |= CDC_OPEN_TRAY; 890 891 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 892 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 893 cd->cdi.capacity = 894 cdrom_number_of_slots(&cd->cdi); 895 if (cd->cdi.capacity <= 1) 896 /* not a changer */ 897 cd->cdi.mask |= CDC_SELECT_DISC; 898 /*else I don't think it can close its tray 899 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 900 901 /* 902 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 903 */ 904 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 905 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 906 cd->writeable = 1; 907 } 908 909 kfree(buffer); 910 return 0; 911 } 912 913 /* 914 * sr_packet() is the entry point for the generic commands generated 915 * by the Uniform CD-ROM layer. 916 */ 917 static int sr_packet(struct cdrom_device_info *cdi, 918 struct packet_command *cgc) 919 { 920 struct scsi_cd *cd = cdi->handle; 921 struct scsi_device *sdev = cd->device; 922 923 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 924 return -EDRIVE_CANT_DO_THIS; 925 926 if (cgc->timeout <= 0) 927 cgc->timeout = IOCTL_TIMEOUT; 928 929 sr_do_ioctl(cd, cgc); 930 931 return cgc->stat; 932 } 933 934 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 935 u32 lba, u32 nr, u8 *last_sense) 936 { 937 struct gendisk *disk = cdi->disk; 938 u32 len = nr * CD_FRAMESIZE_RAW; 939 struct scsi_cmnd *scmd; 940 struct request *rq; 941 struct bio *bio; 942 int ret; 943 944 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0); 945 if (IS_ERR(rq)) 946 return PTR_ERR(rq); 947 scmd = blk_mq_rq_to_pdu(rq); 948 949 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL); 950 if (ret) 951 goto out_put_request; 952 953 scmd->cmnd[0] = GPCMD_READ_CD; 954 scmd->cmnd[1] = 1 << 2; 955 scmd->cmnd[2] = (lba >> 24) & 0xff; 956 scmd->cmnd[3] = (lba >> 16) & 0xff; 957 scmd->cmnd[4] = (lba >> 8) & 0xff; 958 scmd->cmnd[5] = lba & 0xff; 959 scmd->cmnd[6] = (nr >> 16) & 0xff; 960 scmd->cmnd[7] = (nr >> 8) & 0xff; 961 scmd->cmnd[8] = nr & 0xff; 962 scmd->cmnd[9] = 0xf8; 963 scmd->cmd_len = 12; 964 rq->timeout = 60 * HZ; 965 bio = rq->bio; 966 967 blk_execute_rq(rq, false); 968 if (scmd->result) { 969 struct scsi_sense_hdr sshdr; 970 971 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len, 972 &sshdr); 973 *last_sense = sshdr.sense_key; 974 ret = -EIO; 975 } 976 977 if (blk_rq_unmap_user(bio)) 978 ret = -EFAULT; 979 out_put_request: 980 blk_mq_free_request(rq); 981 return ret; 982 } 983 984 static int sr_remove(struct device *dev) 985 { 986 struct scsi_cd *cd = dev_get_drvdata(dev); 987 988 scsi_autopm_get_device(cd->device); 989 990 del_gendisk(cd->disk); 991 put_disk(cd->disk); 992 993 return 0; 994 } 995 996 static int __init init_sr(void) 997 { 998 int rc; 999 1000 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1001 if (rc) 1002 return rc; 1003 rc = scsi_register_driver(&sr_template.gendrv); 1004 if (rc) 1005 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1006 1007 return rc; 1008 } 1009 1010 static void __exit exit_sr(void) 1011 { 1012 scsi_unregister_driver(&sr_template.gendrv); 1013 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1014 } 1015 1016 module_init(init_sr); 1017 module_exit(exit_sr); 1018 MODULE_LICENSE("GPL"); 1019