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 70MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 71MODULE_LICENSE("GPL"); 72MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 73MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 74MODULE_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 85static int sr_probe(struct device *); 86static int sr_remove(struct device *); 87static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); 88static int sr_done(struct scsi_cmnd *); 89static int sr_runtime_suspend(struct device *dev); 90 91static const struct dev_pm_ops sr_pm_ops = { 92 .runtime_suspend = sr_runtime_suspend, 93}; 94 95static 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 107static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 108static DEFINE_SPINLOCK(sr_index_lock); 109 110static struct lock_class_key sr_bio_compl_lkclass; 111 112static int sr_open(struct cdrom_device_info *, int); 113static void sr_release(struct cdrom_device_info *); 114 115static void get_sectorsize(struct scsi_cd *); 116static int get_capabilities(struct scsi_cd *); 117 118static unsigned int sr_check_events(struct cdrom_device_info *cdi, 119 unsigned int clearing, int slot); 120static int sr_packet(struct cdrom_device_info *, struct packet_command *); 121static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 122 u32 lba, u32 nr, u8 *last_sense); 123 124static 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 141static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 142{ 143 return disk->private_data; 144} 145 146static 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 159static 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 const struct scsi_exec_args exec_args = { 174 .sshdr = &sshdr, 175 }; 176 int result; 177 178 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buf, sizeof(buf), 179 SR_TIMEOUT, MAX_RETRIES, &exec_args); 180 if (result > 0 && scsi_sense_valid(&sshdr) && 181 sshdr.sense_key == UNIT_ATTENTION) 182 return DISK_EVENT_MEDIA_CHANGE; 183 184 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 185 return 0; 186 187 if (eh->nea || eh->notification_class != 0x4) 188 return 0; 189 190 if (med->media_event_code == 1) 191 return DISK_EVENT_EJECT_REQUEST; 192 else if (med->media_event_code == 2) 193 return DISK_EVENT_MEDIA_CHANGE; 194 else if (med->media_event_code == 3) 195 return DISK_EVENT_MEDIA_CHANGE; 196 return 0; 197} 198 199/* 200 * This function checks to see if the media has been changed or eject 201 * button has been pressed. It is possible that we have already 202 * sensed a change, or the drive may have sensed one and not yet 203 * reported it. The past events are accumulated in sdev->changed and 204 * returned together with the current state. 205 */ 206static unsigned int sr_check_events(struct cdrom_device_info *cdi, 207 unsigned int clearing, int slot) 208{ 209 struct scsi_cd *cd = cdi->handle; 210 bool last_present; 211 struct scsi_sense_hdr sshdr; 212 unsigned int events; 213 int ret; 214 215 /* no changer support */ 216 if (CDSL_CURRENT != slot) 217 return 0; 218 219 events = sr_get_events(cd->device); 220 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 221 222 /* 223 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 224 * for several times in a row. We rely on TUR only for this likely 225 * broken device, to prevent generating incorrect media changed 226 * events for every open(). 227 */ 228 if (cd->ignore_get_event) { 229 events &= ~DISK_EVENT_MEDIA_CHANGE; 230 goto do_tur; 231 } 232 233 /* 234 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 235 * is being cleared. Note that there are devices which hang 236 * if asked to execute TUR repeatedly. 237 */ 238 if (cd->device->changed) { 239 events |= DISK_EVENT_MEDIA_CHANGE; 240 cd->device->changed = 0; 241 cd->tur_changed = true; 242 } 243 244 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 245 return events; 246do_tur: 247 /* let's see whether the media is there with TUR */ 248 last_present = cd->media_present; 249 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 250 251 /* 252 * Media is considered to be present if TUR succeeds or fails with 253 * sense data indicating something other than media-not-present 254 * (ASC 0x3a). 255 */ 256 cd->media_present = scsi_status_is_good(ret) || 257 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 258 259 if (last_present != cd->media_present) 260 cd->device->changed = 1; 261 262 if (cd->device->changed) { 263 events |= DISK_EVENT_MEDIA_CHANGE; 264 cd->device->changed = 0; 265 cd->tur_changed = true; 266 } 267 268 if (cd->ignore_get_event) 269 return events; 270 271 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 272 if (!cd->tur_changed) { 273 if (cd->get_event_changed) { 274 if (cd->tur_mismatch++ > 8) { 275 sr_printk(KERN_WARNING, cd, 276 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 277 cd->ignore_get_event = true; 278 } 279 } else { 280 cd->tur_mismatch = 0; 281 } 282 } 283 cd->tur_changed = false; 284 cd->get_event_changed = false; 285 286 return events; 287} 288 289/* 290 * sr_done is the interrupt routine for the device driver. 291 * 292 * It will be notified on the end of a SCSI read / write, and will take one 293 * of several actions based on success or failure. 294 */ 295static int sr_done(struct scsi_cmnd *SCpnt) 296{ 297 int result = SCpnt->result; 298 int this_count = scsi_bufflen(SCpnt); 299 int good_bytes = (result == 0 ? this_count : 0); 300 int block_sectors = 0; 301 long error_sector; 302 struct request *rq = scsi_cmd_to_rq(SCpnt); 303 struct scsi_cd *cd = scsi_cd(rq->q->disk); 304 305#ifdef DEBUG 306 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 307#endif 308 309 /* 310 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 311 * success. Since this is a relatively rare error condition, no 312 * care is taken to avoid unnecessary additional work such as 313 * memcpy's that could be avoided. 314 */ 315 if (scsi_status_is_check_condition(result) && 316 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 317 switch (SCpnt->sense_buffer[2]) { 318 case MEDIUM_ERROR: 319 case VOLUME_OVERFLOW: 320 case ILLEGAL_REQUEST: 321 if (!(SCpnt->sense_buffer[0] & 0x90)) 322 break; 323 error_sector = 324 get_unaligned_be32(&SCpnt->sense_buffer[3]); 325 if (rq->bio != NULL) 326 block_sectors = bio_sectors(rq->bio); 327 if (block_sectors < 4) 328 block_sectors = 4; 329 if (cd->device->sector_size == 2048) 330 error_sector <<= 2; 331 error_sector &= ~(block_sectors - 1); 332 good_bytes = (error_sector - blk_rq_pos(rq)) << 9; 333 if (good_bytes < 0 || good_bytes >= this_count) 334 good_bytes = 0; 335 /* 336 * The SCSI specification allows for the value 337 * returned by READ CAPACITY to be up to 75 2K 338 * sectors past the last readable block. 339 * Therefore, if we hit a medium error within the 340 * last 75 2K sectors, we decrease the saved size 341 * value. 342 */ 343 if (error_sector < get_capacity(cd->disk) && 344 cd->capacity - error_sector < 4 * 75) 345 set_capacity(cd->disk, error_sector); 346 break; 347 348 case RECOVERED_ERROR: 349 good_bytes = this_count; 350 break; 351 352 default: 353 break; 354 } 355 } 356 357 return good_bytes; 358} 359 360static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) 361{ 362 int block = 0, this_count, s_size; 363 struct scsi_cd *cd; 364 struct request *rq = scsi_cmd_to_rq(SCpnt); 365 blk_status_t ret; 366 367 ret = scsi_alloc_sgtables(SCpnt); 368 if (ret != BLK_STS_OK) 369 return ret; 370 cd = scsi_cd(rq->q->disk); 371 372 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 373 "Doing sr request, block = %d\n", block)); 374 375 if (!cd->device || !scsi_device_online(cd->device)) { 376 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 377 "Finishing %u sectors\n", blk_rq_sectors(rq))); 378 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 379 "Retry with 0x%p\n", SCpnt)); 380 goto out; 381 } 382 383 if (cd->device->changed) { 384 /* 385 * quietly refuse to do anything to a changed disc until the 386 * changed bit has been reset 387 */ 388 goto out; 389 } 390 391 s_size = cd->device->sector_size; 392 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 393 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 394 goto out; 395 } 396 397 switch (req_op(rq)) { 398 case REQ_OP_WRITE: 399 if (!cd->writeable) 400 goto out; 401 SCpnt->cmnd[0] = WRITE_10; 402 cd->cdi.media_written = 1; 403 break; 404 case REQ_OP_READ: 405 SCpnt->cmnd[0] = READ_10; 406 break; 407 default: 408 blk_dump_rq_flags(rq, "Unknown sr command"); 409 goto out; 410 } 411 412 { 413 struct scatterlist *sg; 414 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 415 416 scsi_for_each_sg(SCpnt, sg, sg_count, i) 417 size += sg->length; 418 419 if (size != scsi_bufflen(SCpnt)) { 420 scmd_printk(KERN_ERR, SCpnt, 421 "mismatch count %d, bytes %d\n", 422 size, scsi_bufflen(SCpnt)); 423 if (scsi_bufflen(SCpnt) > size) 424 SCpnt->sdb.length = size; 425 } 426 } 427 428 /* 429 * request doesn't start on hw block boundary, add scatter pads 430 */ 431 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 432 (scsi_bufflen(SCpnt) % s_size)) { 433 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 434 goto out; 435 } 436 437 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 438 439 440 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 441 "%s %d/%u 512 byte blocks.\n", 442 (rq_data_dir(rq) == WRITE) ? 443 "writing" : "reading", 444 this_count, blk_rq_sectors(rq))); 445 446 SCpnt->cmnd[1] = 0; 447 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 448 449 if (this_count > 0xffff) { 450 this_count = 0xffff; 451 SCpnt->sdb.length = this_count * s_size; 452 } 453 454 put_unaligned_be32(block, &SCpnt->cmnd[2]); 455 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 456 put_unaligned_be16(this_count, &SCpnt->cmnd[7]); 457 458 /* 459 * We shouldn't disconnect in the middle of a sector, so with a dumb 460 * host adapter, it's safe to assume that we can at least transfer 461 * this many bytes between each connect / disconnect. 462 */ 463 SCpnt->transfersize = cd->device->sector_size; 464 SCpnt->underflow = this_count << 9; 465 SCpnt->allowed = MAX_RETRIES; 466 SCpnt->cmd_len = 10; 467 468 /* 469 * This indicates that the command is ready from our end to be queued. 470 */ 471 return BLK_STS_OK; 472 out: 473 scsi_free_sgtables(SCpnt); 474 return BLK_STS_IOERR; 475} 476 477static void sr_revalidate_disk(struct scsi_cd *cd) 478{ 479 struct scsi_sense_hdr sshdr; 480 481 /* if the unit is not ready, nothing more to do */ 482 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 483 return; 484 sr_cd_check(&cd->cdi); 485 get_sectorsize(cd); 486} 487 488static int sr_block_open(struct gendisk *disk, blk_mode_t mode) 489{ 490 struct scsi_cd *cd = scsi_cd(disk); 491 struct scsi_device *sdev = cd->device; 492 int ret; 493 494 if (scsi_device_get(cd->device)) 495 return -ENXIO; 496 497 scsi_autopm_get_device(sdev); 498 if (disk_check_media_change(disk)) 499 sr_revalidate_disk(cd); 500 501 mutex_lock(&cd->lock); 502 ret = cdrom_open(&cd->cdi, mode); 503 mutex_unlock(&cd->lock); 504 505 scsi_autopm_put_device(sdev); 506 if (ret) 507 scsi_device_put(cd->device); 508 return ret; 509} 510 511static void sr_block_release(struct gendisk *disk) 512{ 513 struct scsi_cd *cd = scsi_cd(disk); 514 515 mutex_lock(&cd->lock); 516 cdrom_release(&cd->cdi); 517 mutex_unlock(&cd->lock); 518 519 scsi_device_put(cd->device); 520} 521 522static int sr_block_ioctl(struct block_device *bdev, blk_mode_t mode, 523 unsigned cmd, unsigned long arg) 524{ 525 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 526 struct scsi_device *sdev = cd->device; 527 void __user *argp = (void __user *)arg; 528 int ret; 529 530 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO)) 531 return -ENOIOCTLCMD; 532 533 mutex_lock(&cd->lock); 534 535 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 536 (mode & BLK_OPEN_NDELAY)); 537 if (ret) 538 goto out; 539 540 scsi_autopm_get_device(sdev); 541 542 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) { 543 ret = cdrom_ioctl(&cd->cdi, bdev, cmd, arg); 544 if (ret != -ENOSYS) 545 goto put; 546 } 547 ret = scsi_ioctl(sdev, mode & BLK_OPEN_WRITE, cmd, argp); 548 549put: 550 scsi_autopm_put_device(sdev); 551out: 552 mutex_unlock(&cd->lock); 553 return ret; 554} 555 556static unsigned int sr_block_check_events(struct gendisk *disk, 557 unsigned int clearing) 558{ 559 struct scsi_cd *cd = disk->private_data; 560 561 if (atomic_read(&cd->device->disk_events_disable_depth)) 562 return 0; 563 return cdrom_check_events(&cd->cdi, clearing); 564} 565 566static void sr_free_disk(struct gendisk *disk) 567{ 568 struct scsi_cd *cd = disk->private_data; 569 570 spin_lock(&sr_index_lock); 571 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 572 spin_unlock(&sr_index_lock); 573 574 unregister_cdrom(&cd->cdi); 575 mutex_destroy(&cd->lock); 576 kfree(cd); 577} 578 579static const struct block_device_operations sr_bdops = 580{ 581 .owner = THIS_MODULE, 582 .open = sr_block_open, 583 .release = sr_block_release, 584 .ioctl = sr_block_ioctl, 585 .compat_ioctl = blkdev_compat_ptr_ioctl, 586 .check_events = sr_block_check_events, 587 .free_disk = sr_free_disk, 588}; 589 590static int sr_open(struct cdrom_device_info *cdi, int purpose) 591{ 592 struct scsi_cd *cd = cdi->handle; 593 struct scsi_device *sdev = cd->device; 594 595 /* 596 * If the device is in error recovery, wait until it is done. 597 * If the device is offline, then disallow any access to it. 598 */ 599 if (!scsi_block_when_processing_errors(sdev)) 600 return -ENXIO; 601 602 return 0; 603} 604 605static void sr_release(struct cdrom_device_info *cdi) 606{ 607} 608 609static int sr_probe(struct device *dev) 610{ 611 struct scsi_device *sdev = to_scsi_device(dev); 612 struct gendisk *disk; 613 struct scsi_cd *cd; 614 int minor, error; 615 616 scsi_autopm_get_device(sdev); 617 error = -ENODEV; 618 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 619 goto fail; 620 621 error = -ENOMEM; 622 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 623 if (!cd) 624 goto fail; 625 626 disk = blk_mq_alloc_disk_for_queue(sdev->request_queue, 627 &sr_bio_compl_lkclass); 628 if (!disk) 629 goto fail_free; 630 mutex_init(&cd->lock); 631 632 spin_lock(&sr_index_lock); 633 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 634 if (minor == SR_DISKS) { 635 spin_unlock(&sr_index_lock); 636 error = -EBUSY; 637 goto fail_put; 638 } 639 __set_bit(minor, sr_index_bits); 640 spin_unlock(&sr_index_lock); 641 642 disk->major = SCSI_CDROM_MAJOR; 643 disk->first_minor = minor; 644 disk->minors = 1; 645 sprintf(disk->disk_name, "sr%d", minor); 646 disk->fops = &sr_bdops; 647 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; 648 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 649 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT | 650 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE; 651 652 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 653 654 cd->device = sdev; 655 cd->disk = disk; 656 cd->capacity = 0x1fffff; 657 cd->device->changed = 1; /* force recheck CD type */ 658 cd->media_present = 1; 659 cd->use = 1; 660 cd->readcd_known = 0; 661 cd->readcd_cdda = 0; 662 663 cd->cdi.ops = &sr_dops; 664 cd->cdi.handle = cd; 665 cd->cdi.mask = 0; 666 cd->cdi.capacity = 1; 667 sprintf(cd->cdi.name, "sr%d", minor); 668 669 sdev->sector_size = 2048; /* A guess, just in case */ 670 671 error = -ENOMEM; 672 if (get_capabilities(cd)) 673 goto fail_minor; 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 701unregister_cdrom: 702 unregister_cdrom(&cd->cdi); 703fail_minor: 704 spin_lock(&sr_index_lock); 705 clear_bit(minor, sr_index_bits); 706 spin_unlock(&sr_index_lock); 707fail_put: 708 put_disk(disk); 709 mutex_destroy(&cd->lock); 710fail_free: 711 kfree(cd); 712fail: 713 scsi_autopm_put_device(sdev); 714 return error; 715} 716 717 718static void get_sectorsize(struct scsi_cd *cd) 719{ 720 static const u8 cmd[10] = { READ_CAPACITY }; 721 unsigned char buffer[8] = { }; 722 int the_result; 723 int sector_size; 724 struct request_queue *queue; 725 struct scsi_failure failure_defs[] = { 726 { 727 .result = SCMD_FAILURE_RESULT_ANY, 728 .allowed = 3, 729 }, 730 {} 731 }; 732 struct scsi_failures failures = { 733 .failure_definitions = failure_defs, 734 }; 735 const struct scsi_exec_args exec_args = { 736 .failures = &failures, 737 }; 738 739 /* Do the command and wait.. */ 740 the_result = scsi_execute_cmd(cd->device, cmd, REQ_OP_DRV_IN, buffer, 741 sizeof(buffer), SR_TIMEOUT, MAX_RETRIES, 742 &exec_args); 743 if (the_result) { 744 cd->capacity = 0x1fffff; 745 sector_size = 2048; /* A guess, just in case */ 746 } else { 747 long last_written; 748 749 cd->capacity = 1 + get_unaligned_be32(&buffer[0]); 750 /* 751 * READ_CAPACITY doesn't return the correct size on 752 * certain UDF media. If last_written is larger, use 753 * it instead. 754 * 755 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 756 */ 757 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 758 cd->capacity = max_t(long, cd->capacity, last_written); 759 760 sector_size = get_unaligned_be32(&buffer[4]); 761 switch (sector_size) { 762 /* 763 * HP 4020i CD-Recorder reports 2340 byte sectors 764 * Philips CD-Writers report 2352 byte sectors 765 * 766 * Use 2k sectors for them.. 767 */ 768 case 0: 769 case 2340: 770 case 2352: 771 sector_size = 2048; 772 fallthrough; 773 case 2048: 774 cd->capacity *= 4; 775 fallthrough; 776 case 512: 777 break; 778 default: 779 sr_printk(KERN_INFO, cd, 780 "unsupported sector size %d.", sector_size); 781 cd->capacity = 0; 782 } 783 784 cd->device->sector_size = sector_size; 785 786 /* 787 * Add this so that we have the ability to correctly gauge 788 * what the device is capable of. 789 */ 790 set_capacity(cd->disk, cd->capacity); 791 } 792 793 queue = cd->device->request_queue; 794 blk_queue_logical_block_size(queue, sector_size); 795 796 return; 797} 798 799static int get_capabilities(struct scsi_cd *cd) 800{ 801 unsigned char *buffer; 802 struct scsi_mode_data data; 803 struct scsi_sense_hdr sshdr; 804 unsigned int ms_len = 128; 805 int rc, n; 806 807 static const char *loadmech[] = 808 { 809 "caddy", 810 "tray", 811 "pop-up", 812 "", 813 "changer", 814 "cartridge changer", 815 "", 816 "" 817 }; 818 819 820 /* allocate transfer buffer */ 821 buffer = kmalloc(512, GFP_KERNEL); 822 if (!buffer) { 823 sr_printk(KERN_ERR, cd, "out of memory.\n"); 824 return -ENOMEM; 825 } 826 827 /* eat unit attentions */ 828 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 829 830 /* ask for mode page 0x2a */ 831 rc = scsi_mode_sense(cd->device, 0, 0x2a, 0, buffer, ms_len, 832 SR_TIMEOUT, 3, &data, NULL); 833 834 if (rc < 0 || data.length > ms_len || 835 data.header_length + data.block_descriptor_length > data.length) { 836 /* failed, drive doesn't have capabilities mode page */ 837 cd->cdi.speed = 1; 838 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 839 CDC_DVD | CDC_DVD_RAM | 840 CDC_SELECT_DISC | CDC_SELECT_SPEED | 841 CDC_MRW | CDC_MRW_W | CDC_RAM); 842 kfree(buffer); 843 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 844 return 0; 845 } 846 847 n = data.header_length + data.block_descriptor_length; 848 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; 849 cd->readcd_known = 1; 850 cd->readcd_cdda = buffer[n + 5] & 0x01; 851 /* print some capability bits */ 852 sr_printk(KERN_INFO, cd, 853 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 854 get_unaligned_be16(&buffer[n + 14]) / 176, 855 cd->cdi.speed, 856 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 857 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 858 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 859 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 860 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 861 loadmech[buffer[n + 6] >> 5]); 862 if ((buffer[n + 6] >> 5) == 0) 863 /* caddy drives can't close tray... */ 864 cd->cdi.mask |= CDC_CLOSE_TRAY; 865 if ((buffer[n + 2] & 0x8) == 0) 866 /* not a DVD drive */ 867 cd->cdi.mask |= CDC_DVD; 868 if ((buffer[n + 3] & 0x20) == 0) 869 /* can't write DVD-RAM media */ 870 cd->cdi.mask |= CDC_DVD_RAM; 871 if ((buffer[n + 3] & 0x10) == 0) 872 /* can't write DVD-R media */ 873 cd->cdi.mask |= CDC_DVD_R; 874 if ((buffer[n + 3] & 0x2) == 0) 875 /* can't write CD-RW media */ 876 cd->cdi.mask |= CDC_CD_RW; 877 if ((buffer[n + 3] & 0x1) == 0) 878 /* can't write CD-R media */ 879 cd->cdi.mask |= CDC_CD_R; 880 if ((buffer[n + 6] & 0x8) == 0) 881 /* can't eject */ 882 cd->cdi.mask |= CDC_OPEN_TRAY; 883 884 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 885 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 886 cd->cdi.capacity = 887 cdrom_number_of_slots(&cd->cdi); 888 if (cd->cdi.capacity <= 1) 889 /* not a changer */ 890 cd->cdi.mask |= CDC_SELECT_DISC; 891 /*else I don't think it can close its tray 892 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 893 894 /* 895 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 896 */ 897 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 898 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 899 cd->writeable = 1; 900 } 901 902 kfree(buffer); 903 return 0; 904} 905 906/* 907 * sr_packet() is the entry point for the generic commands generated 908 * by the Uniform CD-ROM layer. 909 */ 910static int sr_packet(struct cdrom_device_info *cdi, 911 struct packet_command *cgc) 912{ 913 struct scsi_cd *cd = cdi->handle; 914 struct scsi_device *sdev = cd->device; 915 916 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 917 return -EDRIVE_CANT_DO_THIS; 918 919 if (cgc->timeout <= 0) 920 cgc->timeout = IOCTL_TIMEOUT; 921 922 sr_do_ioctl(cd, cgc); 923 924 return cgc->stat; 925} 926 927static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 928 u32 lba, u32 nr, u8 *last_sense) 929{ 930 struct gendisk *disk = cdi->disk; 931 u32 len = nr * CD_FRAMESIZE_RAW; 932 struct scsi_cmnd *scmd; 933 struct request *rq; 934 struct bio *bio; 935 int ret; 936 937 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0); 938 if (IS_ERR(rq)) 939 return PTR_ERR(rq); 940 scmd = blk_mq_rq_to_pdu(rq); 941 942 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL); 943 if (ret) 944 goto out_put_request; 945 946 scmd->cmnd[0] = GPCMD_READ_CD; 947 scmd->cmnd[1] = 1 << 2; 948 scmd->cmnd[2] = (lba >> 24) & 0xff; 949 scmd->cmnd[3] = (lba >> 16) & 0xff; 950 scmd->cmnd[4] = (lba >> 8) & 0xff; 951 scmd->cmnd[5] = lba & 0xff; 952 scmd->cmnd[6] = (nr >> 16) & 0xff; 953 scmd->cmnd[7] = (nr >> 8) & 0xff; 954 scmd->cmnd[8] = nr & 0xff; 955 scmd->cmnd[9] = 0xf8; 956 scmd->cmd_len = 12; 957 rq->timeout = 60 * HZ; 958 bio = rq->bio; 959 960 blk_execute_rq(rq, false); 961 if (scmd->result) { 962 struct scsi_sense_hdr sshdr; 963 964 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len, 965 &sshdr); 966 *last_sense = sshdr.sense_key; 967 ret = -EIO; 968 } 969 970 if (blk_rq_unmap_user(bio)) 971 ret = -EFAULT; 972out_put_request: 973 blk_mq_free_request(rq); 974 return ret; 975} 976 977static int sr_remove(struct device *dev) 978{ 979 struct scsi_cd *cd = dev_get_drvdata(dev); 980 981 scsi_autopm_get_device(cd->device); 982 983 del_gendisk(cd->disk); 984 put_disk(cd->disk); 985 986 return 0; 987} 988 989static int __init init_sr(void) 990{ 991 int rc; 992 993 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 994 if (rc) 995 return rc; 996 rc = scsi_register_driver(&sr_template.gendrv); 997 if (rc) 998 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 999 1000 return rc; 1001} 1002 1003static void __exit exit_sr(void) 1004{ 1005 scsi_unregister_driver(&sr_template.gendrv); 1006 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1007} 1008 1009module_init(init_sr); 1010module_exit(exit_sr); 1011MODULE_LICENSE("GPL"); 1012