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 .owner = THIS_MODULE, 99 .probe = sr_probe, 100 .remove = sr_remove, 101 .pm = &sr_pm_ops, 102 }, 103 .init_command = sr_init_command, 104 .done = sr_done, 105 }; 106 107 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 108 static DEFINE_SPINLOCK(sr_index_lock); 109 110 static struct lock_class_key sr_bio_compl_lkclass; 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 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 122 u32 lba, u32 nr, u8 *last_sense); 123 124 static const struct cdrom_device_ops sr_dops = { 125 .open = sr_open, 126 .release = sr_release, 127 .drive_status = sr_drive_status, 128 .check_events = sr_check_events, 129 .tray_move = sr_tray_move, 130 .lock_door = sr_lock_door, 131 .select_speed = sr_select_speed, 132 .get_last_session = sr_get_last_session, 133 .get_mcn = sr_get_mcn, 134 .reset = sr_reset, 135 .audio_ioctl = sr_audio_ioctl, 136 .generic_packet = sr_packet, 137 .read_cdda_bpc = sr_read_cdda_bpc, 138 .capability = SR_CAPABILITIES, 139 }; 140 141 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 142 { 143 return disk->private_data; 144 } 145 146 static int sr_runtime_suspend(struct device *dev) 147 { 148 struct scsi_cd *cd = dev_get_drvdata(dev); 149 150 if (!cd) /* E.g.: runtime suspend following sr_remove() */ 151 return 0; 152 153 if (cd->media_present) 154 return -EBUSY; 155 else 156 return 0; 157 } 158 159 static unsigned int sr_get_events(struct scsi_device *sdev) 160 { 161 u8 buf[8]; 162 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 163 1, /* polled */ 164 0, 0, /* reserved */ 165 1 << 4, /* notification class: media */ 166 0, 0, /* reserved */ 167 0, sizeof(buf), /* allocation length */ 168 0, /* control */ 169 }; 170 struct event_header *eh = (void *)buf; 171 struct media_event_desc *med = (void *)(buf + 4); 172 struct scsi_sense_hdr sshdr; 173 int result; 174 175 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 176 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 177 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 178 return DISK_EVENT_MEDIA_CHANGE; 179 180 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 181 return 0; 182 183 if (eh->nea || eh->notification_class != 0x4) 184 return 0; 185 186 if (med->media_event_code == 1) 187 return DISK_EVENT_EJECT_REQUEST; 188 else if (med->media_event_code == 2) 189 return DISK_EVENT_MEDIA_CHANGE; 190 else if (med->media_event_code == 3) 191 return DISK_EVENT_MEDIA_CHANGE; 192 return 0; 193 } 194 195 /* 196 * This function checks to see if the media has been changed or eject 197 * button has been pressed. It is possible that we have already 198 * sensed a change, or the drive may have sensed one and not yet 199 * reported it. The past events are accumulated in sdev->changed and 200 * returned together with the current state. 201 */ 202 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 203 unsigned int clearing, int slot) 204 { 205 struct scsi_cd *cd = cdi->handle; 206 bool last_present; 207 struct scsi_sense_hdr sshdr; 208 unsigned int events; 209 int ret; 210 211 /* no changer support */ 212 if (CDSL_CURRENT != slot) 213 return 0; 214 215 events = sr_get_events(cd->device); 216 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 217 218 /* 219 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 220 * for several times in a row. We rely on TUR only for this likely 221 * broken device, to prevent generating incorrect media changed 222 * events for every open(). 223 */ 224 if (cd->ignore_get_event) { 225 events &= ~DISK_EVENT_MEDIA_CHANGE; 226 goto do_tur; 227 } 228 229 /* 230 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 231 * is being cleared. Note that there are devices which hang 232 * if asked to execute TUR repeatedly. 233 */ 234 if (cd->device->changed) { 235 events |= DISK_EVENT_MEDIA_CHANGE; 236 cd->device->changed = 0; 237 cd->tur_changed = true; 238 } 239 240 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 241 return events; 242 do_tur: 243 /* let's see whether the media is there with TUR */ 244 last_present = cd->media_present; 245 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 246 247 /* 248 * Media is considered to be present if TUR succeeds or fails with 249 * sense data indicating something other than media-not-present 250 * (ASC 0x3a). 251 */ 252 cd->media_present = scsi_status_is_good(ret) || 253 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 254 255 if (last_present != cd->media_present) 256 cd->device->changed = 1; 257 258 if (cd->device->changed) { 259 events |= DISK_EVENT_MEDIA_CHANGE; 260 cd->device->changed = 0; 261 cd->tur_changed = true; 262 } 263 264 if (cd->ignore_get_event) 265 return events; 266 267 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 268 if (!cd->tur_changed) { 269 if (cd->get_event_changed) { 270 if (cd->tur_mismatch++ > 8) { 271 sr_printk(KERN_WARNING, cd, 272 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 273 cd->ignore_get_event = true; 274 } 275 } else { 276 cd->tur_mismatch = 0; 277 } 278 } 279 cd->tur_changed = false; 280 cd->get_event_changed = false; 281 282 return events; 283 } 284 285 /* 286 * sr_done is the interrupt routine for the device driver. 287 * 288 * It will be notified on the end of a SCSI read / write, and will take one 289 * of several actions based on success or failure. 290 */ 291 static int sr_done(struct scsi_cmnd *SCpnt) 292 { 293 int result = SCpnt->result; 294 int this_count = scsi_bufflen(SCpnt); 295 int good_bytes = (result == 0 ? this_count : 0); 296 int block_sectors = 0; 297 long error_sector; 298 struct request *rq = scsi_cmd_to_rq(SCpnt); 299 struct scsi_cd *cd = scsi_cd(rq->q->disk); 300 301 #ifdef DEBUG 302 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 303 #endif 304 305 /* 306 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 307 * success. Since this is a relatively rare error condition, no 308 * care is taken to avoid unnecessary additional work such as 309 * memcpy's that could be avoided. 310 */ 311 if (scsi_status_is_check_condition(result) && 312 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 313 switch (SCpnt->sense_buffer[2]) { 314 case MEDIUM_ERROR: 315 case VOLUME_OVERFLOW: 316 case ILLEGAL_REQUEST: 317 if (!(SCpnt->sense_buffer[0] & 0x90)) 318 break; 319 error_sector = 320 get_unaligned_be32(&SCpnt->sense_buffer[3]); 321 if (rq->bio != NULL) 322 block_sectors = bio_sectors(rq->bio); 323 if (block_sectors < 4) 324 block_sectors = 4; 325 if (cd->device->sector_size == 2048) 326 error_sector <<= 2; 327 error_sector &= ~(block_sectors - 1); 328 good_bytes = (error_sector - blk_rq_pos(rq)) << 9; 329 if (good_bytes < 0 || good_bytes >= this_count) 330 good_bytes = 0; 331 /* 332 * The SCSI specification allows for the value 333 * returned by READ CAPACITY to be up to 75 2K 334 * sectors past the last readable block. 335 * Therefore, if we hit a medium error within the 336 * last 75 2K sectors, we decrease the saved size 337 * value. 338 */ 339 if (error_sector < get_capacity(cd->disk) && 340 cd->capacity - error_sector < 4 * 75) 341 set_capacity(cd->disk, error_sector); 342 break; 343 344 case RECOVERED_ERROR: 345 good_bytes = this_count; 346 break; 347 348 default: 349 break; 350 } 351 } 352 353 return good_bytes; 354 } 355 356 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) 357 { 358 int block = 0, this_count, s_size; 359 struct scsi_cd *cd; 360 struct request *rq = scsi_cmd_to_rq(SCpnt); 361 blk_status_t ret; 362 363 ret = scsi_alloc_sgtables(SCpnt); 364 if (ret != BLK_STS_OK) 365 return ret; 366 cd = scsi_cd(rq->q->disk); 367 368 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 369 "Doing sr request, block = %d\n", block)); 370 371 if (!cd->device || !scsi_device_online(cd->device)) { 372 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 373 "Finishing %u sectors\n", blk_rq_sectors(rq))); 374 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 375 "Retry with 0x%p\n", SCpnt)); 376 goto out; 377 } 378 379 if (cd->device->changed) { 380 /* 381 * quietly refuse to do anything to a changed disc until the 382 * changed bit has been reset 383 */ 384 goto out; 385 } 386 387 s_size = cd->device->sector_size; 388 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 389 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 390 goto out; 391 } 392 393 switch (req_op(rq)) { 394 case REQ_OP_WRITE: 395 if (!cd->writeable) 396 goto out; 397 SCpnt->cmnd[0] = WRITE_10; 398 cd->cdi.media_written = 1; 399 break; 400 case REQ_OP_READ: 401 SCpnt->cmnd[0] = READ_10; 402 break; 403 default: 404 blk_dump_rq_flags(rq, "Unknown sr command"); 405 goto out; 406 } 407 408 { 409 struct scatterlist *sg; 410 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 411 412 scsi_for_each_sg(SCpnt, sg, sg_count, i) 413 size += sg->length; 414 415 if (size != scsi_bufflen(SCpnt)) { 416 scmd_printk(KERN_ERR, SCpnt, 417 "mismatch count %d, bytes %d\n", 418 size, scsi_bufflen(SCpnt)); 419 if (scsi_bufflen(SCpnt) > size) 420 SCpnt->sdb.length = size; 421 } 422 } 423 424 /* 425 * request doesn't start on hw block boundary, add scatter pads 426 */ 427 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 428 (scsi_bufflen(SCpnt) % s_size)) { 429 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 430 goto out; 431 } 432 433 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 434 435 436 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 437 "%s %d/%u 512 byte blocks.\n", 438 (rq_data_dir(rq) == WRITE) ? 439 "writing" : "reading", 440 this_count, blk_rq_sectors(rq))); 441 442 SCpnt->cmnd[1] = 0; 443 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 444 445 if (this_count > 0xffff) { 446 this_count = 0xffff; 447 SCpnt->sdb.length = this_count * s_size; 448 } 449 450 put_unaligned_be32(block, &SCpnt->cmnd[2]); 451 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 452 put_unaligned_be16(this_count, &SCpnt->cmnd[7]); 453 454 /* 455 * We shouldn't disconnect in the middle of a sector, so with a dumb 456 * host adapter, it's safe to assume that we can at least transfer 457 * this many bytes between each connect / disconnect. 458 */ 459 SCpnt->transfersize = cd->device->sector_size; 460 SCpnt->underflow = this_count << 9; 461 SCpnt->allowed = MAX_RETRIES; 462 SCpnt->cmd_len = 10; 463 464 /* 465 * This indicates that the command is ready from our end to be queued. 466 */ 467 return BLK_STS_OK; 468 out: 469 scsi_free_sgtables(SCpnt); 470 return BLK_STS_IOERR; 471 } 472 473 static void sr_revalidate_disk(struct scsi_cd *cd) 474 { 475 struct scsi_sense_hdr sshdr; 476 477 /* if the unit is not ready, nothing more to do */ 478 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 479 return; 480 sr_cd_check(&cd->cdi); 481 get_sectorsize(cd); 482 } 483 484 static int sr_block_open(struct block_device *bdev, fmode_t mode) 485 { 486 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 487 struct scsi_device *sdev = cd->device; 488 int ret; 489 490 if (scsi_device_get(cd->device)) 491 return -ENXIO; 492 493 scsi_autopm_get_device(sdev); 494 if (bdev_check_media_change(bdev)) 495 sr_revalidate_disk(cd); 496 497 mutex_lock(&cd->lock); 498 ret = cdrom_open(&cd->cdi, bdev, mode); 499 mutex_unlock(&cd->lock); 500 501 scsi_autopm_put_device(sdev); 502 if (ret) 503 scsi_device_put(cd->device); 504 return ret; 505 } 506 507 static void sr_block_release(struct gendisk *disk, fmode_t mode) 508 { 509 struct scsi_cd *cd = scsi_cd(disk); 510 511 mutex_lock(&cd->lock); 512 cdrom_release(&cd->cdi, mode); 513 mutex_unlock(&cd->lock); 514 515 scsi_device_put(cd->device); 516 } 517 518 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 519 unsigned long arg) 520 { 521 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 522 struct scsi_device *sdev = cd->device; 523 void __user *argp = (void __user *)arg; 524 int ret; 525 526 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO)) 527 return -ENOIOCTLCMD; 528 529 mutex_lock(&cd->lock); 530 531 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 532 (mode & FMODE_NDELAY) != 0); 533 if (ret) 534 goto out; 535 536 scsi_autopm_get_device(sdev); 537 538 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) { 539 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 540 if (ret != -ENOSYS) 541 goto put; 542 } 543 ret = scsi_ioctl(sdev, mode, cmd, argp); 544 545 put: 546 scsi_autopm_put_device(sdev); 547 out: 548 mutex_unlock(&cd->lock); 549 return ret; 550 } 551 552 static unsigned int sr_block_check_events(struct gendisk *disk, 553 unsigned int clearing) 554 { 555 struct scsi_cd *cd = disk->private_data; 556 557 if (atomic_read(&cd->device->disk_events_disable_depth)) 558 return 0; 559 return cdrom_check_events(&cd->cdi, clearing); 560 } 561 562 static void sr_free_disk(struct gendisk *disk) 563 { 564 struct scsi_cd *cd = disk->private_data; 565 566 spin_lock(&sr_index_lock); 567 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 568 spin_unlock(&sr_index_lock); 569 570 unregister_cdrom(&cd->cdi); 571 mutex_destroy(&cd->lock); 572 kfree(cd); 573 } 574 575 static const struct block_device_operations sr_bdops = 576 { 577 .owner = THIS_MODULE, 578 .open = sr_block_open, 579 .release = sr_block_release, 580 .ioctl = sr_block_ioctl, 581 .compat_ioctl = blkdev_compat_ptr_ioctl, 582 .check_events = sr_block_check_events, 583 .free_disk = sr_free_disk, 584 }; 585 586 static int sr_open(struct cdrom_device_info *cdi, int purpose) 587 { 588 struct scsi_cd *cd = cdi->handle; 589 struct scsi_device *sdev = cd->device; 590 int retval; 591 592 /* 593 * If the device is in error recovery, wait until it is done. 594 * If the device is offline, then disallow any access to it. 595 */ 596 retval = -ENXIO; 597 if (!scsi_block_when_processing_errors(sdev)) 598 goto error_out; 599 600 return 0; 601 602 error_out: 603 return retval; 604 } 605 606 static void sr_release(struct cdrom_device_info *cdi) 607 { 608 } 609 610 static int sr_probe(struct device *dev) 611 { 612 struct scsi_device *sdev = to_scsi_device(dev); 613 struct gendisk *disk; 614 struct scsi_cd *cd; 615 int minor, error; 616 617 scsi_autopm_get_device(sdev); 618 error = -ENODEV; 619 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 620 goto fail; 621 622 error = -ENOMEM; 623 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 624 if (!cd) 625 goto fail; 626 627 disk = __alloc_disk_node(sdev->request_queue, NUMA_NO_NODE, 628 &sr_bio_compl_lkclass); 629 if (!disk) 630 goto fail_free; 631 mutex_init(&cd->lock); 632 633 spin_lock(&sr_index_lock); 634 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 635 if (minor == SR_DISKS) { 636 spin_unlock(&sr_index_lock); 637 error = -EBUSY; 638 goto fail_put; 639 } 640 __set_bit(minor, sr_index_bits); 641 spin_unlock(&sr_index_lock); 642 643 disk->major = SCSI_CDROM_MAJOR; 644 disk->first_minor = minor; 645 disk->minors = 1; 646 sprintf(disk->disk_name, "sr%d", minor); 647 disk->fops = &sr_bdops; 648 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; 649 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 650 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT | 651 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE; 652 653 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 654 655 cd->device = sdev; 656 cd->disk = disk; 657 cd->capacity = 0x1fffff; 658 cd->device->changed = 1; /* force recheck CD type */ 659 cd->media_present = 1; 660 cd->use = 1; 661 cd->readcd_known = 0; 662 cd->readcd_cdda = 0; 663 664 cd->cdi.ops = &sr_dops; 665 cd->cdi.handle = cd; 666 cd->cdi.mask = 0; 667 cd->cdi.capacity = 1; 668 sprintf(cd->cdi.name, "sr%d", minor); 669 670 sdev->sector_size = 2048; /* A guess, just in case */ 671 672 /* FIXME: need to handle a get_capabilities failure properly ?? */ 673 get_capabilities(cd); 674 sr_vendor_init(cd); 675 676 set_capacity(disk, cd->capacity); 677 disk->private_data = cd; 678 679 if (register_cdrom(disk, &cd->cdi)) 680 goto fail_minor; 681 682 /* 683 * Initialize block layer runtime PM stuffs before the 684 * periodic event checking request gets started in add_disk. 685 */ 686 blk_pm_runtime_init(sdev->request_queue, dev); 687 688 dev_set_drvdata(dev, cd); 689 sr_revalidate_disk(cd); 690 691 error = device_add_disk(&sdev->sdev_gendev, disk, NULL); 692 if (error) 693 goto unregister_cdrom; 694 695 sdev_printk(KERN_DEBUG, sdev, 696 "Attached scsi CD-ROM %s\n", cd->cdi.name); 697 scsi_autopm_put_device(cd->device); 698 699 return 0; 700 701 unregister_cdrom: 702 unregister_cdrom(&cd->cdi); 703 fail_minor: 704 spin_lock(&sr_index_lock); 705 clear_bit(minor, sr_index_bits); 706 spin_unlock(&sr_index_lock); 707 fail_put: 708 put_disk(disk); 709 mutex_destroy(&cd->lock); 710 fail_free: 711 kfree(cd); 712 fail: 713 scsi_autopm_put_device(sdev); 714 return error; 715 } 716 717 718 static void get_sectorsize(struct scsi_cd *cd) 719 { 720 unsigned char cmd[10]; 721 unsigned char buffer[8]; 722 int the_result, retries = 3; 723 int sector_size; 724 struct request_queue *queue; 725 726 do { 727 cmd[0] = READ_CAPACITY; 728 memset((void *) &cmd[1], 0, 9); 729 memset(buffer, 0, sizeof(buffer)); 730 731 /* Do the command and wait.. */ 732 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 733 buffer, sizeof(buffer), NULL, 734 SR_TIMEOUT, MAX_RETRIES, NULL); 735 736 retries--; 737 738 } while (the_result && retries); 739 740 741 if (the_result) { 742 cd->capacity = 0x1fffff; 743 sector_size = 2048; /* A guess, just in case */ 744 } else { 745 long last_written; 746 747 cd->capacity = 1 + get_unaligned_be32(&buffer[0]); 748 /* 749 * READ_CAPACITY doesn't return the correct size on 750 * certain UDF media. If last_written is larger, use 751 * it instead. 752 * 753 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 754 */ 755 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 756 cd->capacity = max_t(long, cd->capacity, last_written); 757 758 sector_size = get_unaligned_be32(&buffer[4]); 759 switch (sector_size) { 760 /* 761 * HP 4020i CD-Recorder reports 2340 byte sectors 762 * Philips CD-Writers report 2352 byte sectors 763 * 764 * Use 2k sectors for them.. 765 */ 766 case 0: 767 case 2340: 768 case 2352: 769 sector_size = 2048; 770 fallthrough; 771 case 2048: 772 cd->capacity *= 4; 773 fallthrough; 774 case 512: 775 break; 776 default: 777 sr_printk(KERN_INFO, cd, 778 "unsupported sector size %d.", sector_size); 779 cd->capacity = 0; 780 } 781 782 cd->device->sector_size = sector_size; 783 784 /* 785 * Add this so that we have the ability to correctly gauge 786 * what the device is capable of. 787 */ 788 set_capacity(cd->disk, cd->capacity); 789 } 790 791 queue = cd->device->request_queue; 792 blk_queue_logical_block_size(queue, sector_size); 793 794 return; 795 } 796 797 static void get_capabilities(struct scsi_cd *cd) 798 { 799 unsigned char *buffer; 800 struct scsi_mode_data data; 801 struct scsi_sense_hdr sshdr; 802 unsigned int ms_len = 128; 803 int rc, n; 804 805 static const char *loadmech[] = 806 { 807 "caddy", 808 "tray", 809 "pop-up", 810 "", 811 "changer", 812 "cartridge changer", 813 "", 814 "" 815 }; 816 817 818 /* allocate transfer buffer */ 819 buffer = kmalloc(512, GFP_KERNEL); 820 if (!buffer) { 821 sr_printk(KERN_ERR, cd, "out of memory.\n"); 822 return; 823 } 824 825 /* eat unit attentions */ 826 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 827 828 /* ask for mode page 0x2a */ 829 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 830 SR_TIMEOUT, 3, &data, NULL); 831 832 if (rc < 0 || data.length > ms_len || 833 data.header_length + data.block_descriptor_length > data.length) { 834 /* failed, drive doesn't have capabilities mode page */ 835 cd->cdi.speed = 1; 836 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 837 CDC_DVD | CDC_DVD_RAM | 838 CDC_SELECT_DISC | CDC_SELECT_SPEED | 839 CDC_MRW | CDC_MRW_W | CDC_RAM); 840 kfree(buffer); 841 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 842 return; 843 } 844 845 n = data.header_length + data.block_descriptor_length; 846 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; 847 cd->readcd_known = 1; 848 cd->readcd_cdda = buffer[n + 5] & 0x01; 849 /* print some capability bits */ 850 sr_printk(KERN_INFO, cd, 851 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 852 get_unaligned_be16(&buffer[n + 14]) / 176, 853 cd->cdi.speed, 854 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 855 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 856 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 857 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 858 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 859 loadmech[buffer[n + 6] >> 5]); 860 if ((buffer[n + 6] >> 5) == 0) 861 /* caddy drives can't close tray... */ 862 cd->cdi.mask |= CDC_CLOSE_TRAY; 863 if ((buffer[n + 2] & 0x8) == 0) 864 /* not a DVD drive */ 865 cd->cdi.mask |= CDC_DVD; 866 if ((buffer[n + 3] & 0x20) == 0) 867 /* can't write DVD-RAM media */ 868 cd->cdi.mask |= CDC_DVD_RAM; 869 if ((buffer[n + 3] & 0x10) == 0) 870 /* can't write DVD-R media */ 871 cd->cdi.mask |= CDC_DVD_R; 872 if ((buffer[n + 3] & 0x2) == 0) 873 /* can't write CD-RW media */ 874 cd->cdi.mask |= CDC_CD_RW; 875 if ((buffer[n + 3] & 0x1) == 0) 876 /* can't write CD-R media */ 877 cd->cdi.mask |= CDC_CD_R; 878 if ((buffer[n + 6] & 0x8) == 0) 879 /* can't eject */ 880 cd->cdi.mask |= CDC_OPEN_TRAY; 881 882 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 883 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 884 cd->cdi.capacity = 885 cdrom_number_of_slots(&cd->cdi); 886 if (cd->cdi.capacity <= 1) 887 /* not a changer */ 888 cd->cdi.mask |= CDC_SELECT_DISC; 889 /*else I don't think it can close its tray 890 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 891 892 /* 893 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 894 */ 895 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 896 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 897 cd->writeable = 1; 898 } 899 900 kfree(buffer); 901 } 902 903 /* 904 * sr_packet() is the entry point for the generic commands generated 905 * by the Uniform CD-ROM layer. 906 */ 907 static int sr_packet(struct cdrom_device_info *cdi, 908 struct packet_command *cgc) 909 { 910 struct scsi_cd *cd = cdi->handle; 911 struct scsi_device *sdev = cd->device; 912 913 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 914 return -EDRIVE_CANT_DO_THIS; 915 916 if (cgc->timeout <= 0) 917 cgc->timeout = IOCTL_TIMEOUT; 918 919 sr_do_ioctl(cd, cgc); 920 921 return cgc->stat; 922 } 923 924 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 925 u32 lba, u32 nr, u8 *last_sense) 926 { 927 struct gendisk *disk = cdi->disk; 928 u32 len = nr * CD_FRAMESIZE_RAW; 929 struct scsi_cmnd *scmd; 930 struct request *rq; 931 struct bio *bio; 932 int ret; 933 934 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0); 935 if (IS_ERR(rq)) 936 return PTR_ERR(rq); 937 scmd = blk_mq_rq_to_pdu(rq); 938 939 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL); 940 if (ret) 941 goto out_put_request; 942 943 scmd->cmnd[0] = GPCMD_READ_CD; 944 scmd->cmnd[1] = 1 << 2; 945 scmd->cmnd[2] = (lba >> 24) & 0xff; 946 scmd->cmnd[3] = (lba >> 16) & 0xff; 947 scmd->cmnd[4] = (lba >> 8) & 0xff; 948 scmd->cmnd[5] = lba & 0xff; 949 scmd->cmnd[6] = (nr >> 16) & 0xff; 950 scmd->cmnd[7] = (nr >> 8) & 0xff; 951 scmd->cmnd[8] = nr & 0xff; 952 scmd->cmnd[9] = 0xf8; 953 scmd->cmd_len = 12; 954 rq->timeout = 60 * HZ; 955 bio = rq->bio; 956 957 blk_execute_rq(rq, false); 958 if (scmd->result) { 959 struct scsi_sense_hdr sshdr; 960 961 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len, 962 &sshdr); 963 *last_sense = sshdr.sense_key; 964 ret = -EIO; 965 } 966 967 if (blk_rq_unmap_user(bio)) 968 ret = -EFAULT; 969 out_put_request: 970 blk_mq_free_request(rq); 971 return ret; 972 } 973 974 static int sr_remove(struct device *dev) 975 { 976 struct scsi_cd *cd = dev_get_drvdata(dev); 977 978 scsi_autopm_get_device(cd->device); 979 980 del_gendisk(cd->disk); 981 put_disk(cd->disk); 982 983 return 0; 984 } 985 986 static int __init init_sr(void) 987 { 988 int rc; 989 990 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 991 if (rc) 992 return rc; 993 rc = scsi_register_driver(&sr_template.gendrv); 994 if (rc) 995 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 996 997 return rc; 998 } 999 1000 static void __exit exit_sr(void) 1001 { 1002 scsi_unregister_driver(&sr_template.gendrv); 1003 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1004 } 1005 1006 module_init(init_sr); 1007 module_exit(exit_sr); 1008 MODULE_LICENSE("GPL"); 1009