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 /* This semaphore is used to mediate the 0->1 reference get in the 113 * face of object destruction (i.e. we can't allow a get on an 114 * object after last put) */ 115 static DEFINE_MUTEX(sr_ref_mutex); 116 117 static int sr_open(struct cdrom_device_info *, int); 118 static void sr_release(struct cdrom_device_info *); 119 120 static void get_sectorsize(struct scsi_cd *); 121 static void get_capabilities(struct scsi_cd *); 122 123 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 124 unsigned int clearing, int slot); 125 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 126 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 127 u32 lba, u32 nr, u8 *last_sense); 128 129 static const struct cdrom_device_ops sr_dops = { 130 .open = sr_open, 131 .release = sr_release, 132 .drive_status = sr_drive_status, 133 .check_events = sr_check_events, 134 .tray_move = sr_tray_move, 135 .lock_door = sr_lock_door, 136 .select_speed = sr_select_speed, 137 .get_last_session = sr_get_last_session, 138 .get_mcn = sr_get_mcn, 139 .reset = sr_reset, 140 .audio_ioctl = sr_audio_ioctl, 141 .generic_packet = sr_packet, 142 .read_cdda_bpc = sr_read_cdda_bpc, 143 .capability = SR_CAPABILITIES, 144 }; 145 146 static void sr_kref_release(struct kref *kref); 147 148 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 149 { 150 return container_of(disk->private_data, struct scsi_cd, driver); 151 } 152 153 static int sr_runtime_suspend(struct device *dev) 154 { 155 struct scsi_cd *cd = dev_get_drvdata(dev); 156 157 if (!cd) /* E.g.: runtime suspend following sr_remove() */ 158 return 0; 159 160 if (cd->media_present) 161 return -EBUSY; 162 else 163 return 0; 164 } 165 166 /* 167 * The get and put routines for the struct scsi_cd. Note this entity 168 * has a scsi_device pointer and owns a reference to this. 169 */ 170 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 171 { 172 struct scsi_cd *cd = NULL; 173 174 mutex_lock(&sr_ref_mutex); 175 if (disk->private_data == NULL) 176 goto out; 177 cd = scsi_cd(disk); 178 kref_get(&cd->kref); 179 if (scsi_device_get(cd->device)) { 180 kref_put(&cd->kref, sr_kref_release); 181 cd = NULL; 182 } 183 out: 184 mutex_unlock(&sr_ref_mutex); 185 return cd; 186 } 187 188 static void scsi_cd_put(struct scsi_cd *cd) 189 { 190 struct scsi_device *sdev = cd->device; 191 192 mutex_lock(&sr_ref_mutex); 193 kref_put(&cd->kref, sr_kref_release); 194 scsi_device_put(sdev); 195 mutex_unlock(&sr_ref_mutex); 196 } 197 198 static unsigned int sr_get_events(struct scsi_device *sdev) 199 { 200 u8 buf[8]; 201 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 202 1, /* polled */ 203 0, 0, /* reserved */ 204 1 << 4, /* notification class: media */ 205 0, 0, /* reserved */ 206 0, sizeof(buf), /* allocation length */ 207 0, /* control */ 208 }; 209 struct event_header *eh = (void *)buf; 210 struct media_event_desc *med = (void *)(buf + 4); 211 struct scsi_sense_hdr sshdr; 212 int result; 213 214 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 215 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 216 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 217 return DISK_EVENT_MEDIA_CHANGE; 218 219 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 220 return 0; 221 222 if (eh->nea || eh->notification_class != 0x4) 223 return 0; 224 225 if (med->media_event_code == 1) 226 return DISK_EVENT_EJECT_REQUEST; 227 else if (med->media_event_code == 2) 228 return DISK_EVENT_MEDIA_CHANGE; 229 else if (med->media_event_code == 3) 230 return DISK_EVENT_MEDIA_CHANGE; 231 return 0; 232 } 233 234 /* 235 * This function checks to see if the media has been changed or eject 236 * button has been pressed. It is possible that we have already 237 * sensed a change, or the drive may have sensed one and not yet 238 * reported it. The past events are accumulated in sdev->changed and 239 * returned together with the current state. 240 */ 241 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 242 unsigned int clearing, int slot) 243 { 244 struct scsi_cd *cd = cdi->handle; 245 bool last_present; 246 struct scsi_sense_hdr sshdr; 247 unsigned int events; 248 int ret; 249 250 /* no changer support */ 251 if (CDSL_CURRENT != slot) 252 return 0; 253 254 events = sr_get_events(cd->device); 255 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 256 257 /* 258 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 259 * for several times in a row. We rely on TUR only for this likely 260 * broken device, to prevent generating incorrect media changed 261 * events for every open(). 262 */ 263 if (cd->ignore_get_event) { 264 events &= ~DISK_EVENT_MEDIA_CHANGE; 265 goto do_tur; 266 } 267 268 /* 269 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 270 * is being cleared. Note that there are devices which hang 271 * if asked to execute TUR repeatedly. 272 */ 273 if (cd->device->changed) { 274 events |= DISK_EVENT_MEDIA_CHANGE; 275 cd->device->changed = 0; 276 cd->tur_changed = true; 277 } 278 279 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 280 return events; 281 do_tur: 282 /* let's see whether the media is there with TUR */ 283 last_present = cd->media_present; 284 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 285 286 /* 287 * Media is considered to be present if TUR succeeds or fails with 288 * sense data indicating something other than media-not-present 289 * (ASC 0x3a). 290 */ 291 cd->media_present = scsi_status_is_good(ret) || 292 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 293 294 if (last_present != cd->media_present) 295 cd->device->changed = 1; 296 297 if (cd->device->changed) { 298 events |= DISK_EVENT_MEDIA_CHANGE; 299 cd->device->changed = 0; 300 cd->tur_changed = true; 301 } 302 303 if (cd->ignore_get_event) 304 return events; 305 306 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 307 if (!cd->tur_changed) { 308 if (cd->get_event_changed) { 309 if (cd->tur_mismatch++ > 8) { 310 sr_printk(KERN_WARNING, cd, 311 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 312 cd->ignore_get_event = true; 313 } 314 } else { 315 cd->tur_mismatch = 0; 316 } 317 } 318 cd->tur_changed = false; 319 cd->get_event_changed = false; 320 321 return events; 322 } 323 324 /* 325 * sr_done is the interrupt routine for the device driver. 326 * 327 * It will be notified on the end of a SCSI read / write, and will take one 328 * of several actions based on success or failure. 329 */ 330 static int sr_done(struct scsi_cmnd *SCpnt) 331 { 332 int result = SCpnt->result; 333 int this_count = scsi_bufflen(SCpnt); 334 int good_bytes = (result == 0 ? this_count : 0); 335 int block_sectors = 0; 336 long error_sector; 337 struct request *rq = scsi_cmd_to_rq(SCpnt); 338 struct scsi_cd *cd = scsi_cd(rq->q->disk); 339 340 #ifdef DEBUG 341 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 342 #endif 343 344 /* 345 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 346 * success. Since this is a relatively rare error condition, no 347 * care is taken to avoid unnecessary additional work such as 348 * memcpy's that could be avoided. 349 */ 350 if (scsi_status_is_check_condition(result) && 351 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 352 switch (SCpnt->sense_buffer[2]) { 353 case MEDIUM_ERROR: 354 case VOLUME_OVERFLOW: 355 case ILLEGAL_REQUEST: 356 if (!(SCpnt->sense_buffer[0] & 0x90)) 357 break; 358 error_sector = 359 get_unaligned_be32(&SCpnt->sense_buffer[3]); 360 if (rq->bio != NULL) 361 block_sectors = bio_sectors(rq->bio); 362 if (block_sectors < 4) 363 block_sectors = 4; 364 if (cd->device->sector_size == 2048) 365 error_sector <<= 2; 366 error_sector &= ~(block_sectors - 1); 367 good_bytes = (error_sector - blk_rq_pos(rq)) << 9; 368 if (good_bytes < 0 || good_bytes >= this_count) 369 good_bytes = 0; 370 /* 371 * The SCSI specification allows for the value 372 * returned by READ CAPACITY to be up to 75 2K 373 * sectors past the last readable block. 374 * Therefore, if we hit a medium error within the 375 * last 75 2K sectors, we decrease the saved size 376 * value. 377 */ 378 if (error_sector < get_capacity(cd->disk) && 379 cd->capacity - error_sector < 4 * 75) 380 set_capacity(cd->disk, error_sector); 381 break; 382 383 case RECOVERED_ERROR: 384 good_bytes = this_count; 385 break; 386 387 default: 388 break; 389 } 390 } 391 392 return good_bytes; 393 } 394 395 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) 396 { 397 int block = 0, this_count, s_size; 398 struct scsi_cd *cd; 399 struct request *rq = scsi_cmd_to_rq(SCpnt); 400 blk_status_t ret; 401 402 ret = scsi_alloc_sgtables(SCpnt); 403 if (ret != BLK_STS_OK) 404 return ret; 405 cd = scsi_cd(rq->q->disk); 406 407 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 408 "Doing sr request, block = %d\n", block)); 409 410 if (!cd->device || !scsi_device_online(cd->device)) { 411 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 412 "Finishing %u sectors\n", blk_rq_sectors(rq))); 413 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 414 "Retry with 0x%p\n", SCpnt)); 415 goto out; 416 } 417 418 if (cd->device->changed) { 419 /* 420 * quietly refuse to do anything to a changed disc until the 421 * changed bit has been reset 422 */ 423 goto out; 424 } 425 426 s_size = cd->device->sector_size; 427 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 428 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 429 goto out; 430 } 431 432 switch (req_op(rq)) { 433 case REQ_OP_WRITE: 434 if (!cd->writeable) 435 goto out; 436 SCpnt->cmnd[0] = WRITE_10; 437 cd->cdi.media_written = 1; 438 break; 439 case REQ_OP_READ: 440 SCpnt->cmnd[0] = READ_10; 441 break; 442 default: 443 blk_dump_rq_flags(rq, "Unknown sr command"); 444 goto out; 445 } 446 447 { 448 struct scatterlist *sg; 449 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 450 451 scsi_for_each_sg(SCpnt, sg, sg_count, i) 452 size += sg->length; 453 454 if (size != scsi_bufflen(SCpnt)) { 455 scmd_printk(KERN_ERR, SCpnt, 456 "mismatch count %d, bytes %d\n", 457 size, scsi_bufflen(SCpnt)); 458 if (scsi_bufflen(SCpnt) > size) 459 SCpnt->sdb.length = size; 460 } 461 } 462 463 /* 464 * request doesn't start on hw block boundary, add scatter pads 465 */ 466 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 467 (scsi_bufflen(SCpnt) % s_size)) { 468 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 469 goto out; 470 } 471 472 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 473 474 475 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 476 "%s %d/%u 512 byte blocks.\n", 477 (rq_data_dir(rq) == WRITE) ? 478 "writing" : "reading", 479 this_count, blk_rq_sectors(rq))); 480 481 SCpnt->cmnd[1] = 0; 482 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 483 484 if (this_count > 0xffff) { 485 this_count = 0xffff; 486 SCpnt->sdb.length = this_count * s_size; 487 } 488 489 put_unaligned_be32(block, &SCpnt->cmnd[2]); 490 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 491 put_unaligned_be16(this_count, &SCpnt->cmnd[7]); 492 493 /* 494 * We shouldn't disconnect in the middle of a sector, so with a dumb 495 * host adapter, it's safe to assume that we can at least transfer 496 * this many bytes between each connect / disconnect. 497 */ 498 SCpnt->transfersize = cd->device->sector_size; 499 SCpnt->underflow = this_count << 9; 500 SCpnt->allowed = MAX_RETRIES; 501 SCpnt->cmd_len = 10; 502 503 /* 504 * This indicates that the command is ready from our end to be queued. 505 */ 506 return BLK_STS_OK; 507 out: 508 scsi_free_sgtables(SCpnt); 509 return BLK_STS_IOERR; 510 } 511 512 static void sr_revalidate_disk(struct scsi_cd *cd) 513 { 514 struct scsi_sense_hdr sshdr; 515 516 /* if the unit is not ready, nothing more to do */ 517 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 518 return; 519 sr_cd_check(&cd->cdi); 520 get_sectorsize(cd); 521 } 522 523 static int sr_block_open(struct block_device *bdev, fmode_t mode) 524 { 525 struct scsi_cd *cd; 526 struct scsi_device *sdev; 527 int ret = -ENXIO; 528 529 cd = scsi_cd_get(bdev->bd_disk); 530 if (!cd) 531 goto out; 532 533 sdev = cd->device; 534 scsi_autopm_get_device(sdev); 535 if (bdev_check_media_change(bdev)) 536 sr_revalidate_disk(cd); 537 538 mutex_lock(&cd->lock); 539 ret = cdrom_open(&cd->cdi, bdev, mode); 540 mutex_unlock(&cd->lock); 541 542 scsi_autopm_put_device(sdev); 543 if (ret) 544 scsi_cd_put(cd); 545 546 out: 547 return ret; 548 } 549 550 static void sr_block_release(struct gendisk *disk, fmode_t mode) 551 { 552 struct scsi_cd *cd = scsi_cd(disk); 553 554 mutex_lock(&cd->lock); 555 cdrom_release(&cd->cdi, mode); 556 mutex_unlock(&cd->lock); 557 558 scsi_cd_put(cd); 559 } 560 561 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 562 unsigned long arg) 563 { 564 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 565 struct scsi_device *sdev = cd->device; 566 void __user *argp = (void __user *)arg; 567 int ret; 568 569 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO)) 570 return -ENOIOCTLCMD; 571 572 mutex_lock(&cd->lock); 573 574 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 575 (mode & FMODE_NDELAY) != 0); 576 if (ret) 577 goto out; 578 579 scsi_autopm_get_device(sdev); 580 581 if (ret != CDROMCLOSETRAY && ret != CDROMEJECT) { 582 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 583 if (ret != -ENOSYS) 584 goto put; 585 } 586 ret = scsi_ioctl(sdev, mode, cmd, argp); 587 588 put: 589 scsi_autopm_put_device(sdev); 590 out: 591 mutex_unlock(&cd->lock); 592 return ret; 593 } 594 595 static unsigned int sr_block_check_events(struct gendisk *disk, 596 unsigned int clearing) 597 { 598 unsigned int ret = 0; 599 struct scsi_cd *cd; 600 601 cd = scsi_cd_get(disk); 602 if (!cd) 603 return 0; 604 605 if (!atomic_read(&cd->device->disk_events_disable_depth)) 606 ret = cdrom_check_events(&cd->cdi, clearing); 607 608 scsi_cd_put(cd); 609 return ret; 610 } 611 612 static const struct block_device_operations sr_bdops = 613 { 614 .owner = THIS_MODULE, 615 .open = sr_block_open, 616 .release = sr_block_release, 617 .ioctl = sr_block_ioctl, 618 .compat_ioctl = blkdev_compat_ptr_ioctl, 619 .check_events = sr_block_check_events, 620 }; 621 622 static int sr_open(struct cdrom_device_info *cdi, int purpose) 623 { 624 struct scsi_cd *cd = cdi->handle; 625 struct scsi_device *sdev = cd->device; 626 int retval; 627 628 /* 629 * If the device is in error recovery, wait until it is done. 630 * If the device is offline, then disallow any access to it. 631 */ 632 retval = -ENXIO; 633 if (!scsi_block_when_processing_errors(sdev)) 634 goto error_out; 635 636 return 0; 637 638 error_out: 639 return retval; 640 } 641 642 static void sr_release(struct cdrom_device_info *cdi) 643 { 644 } 645 646 static int sr_probe(struct device *dev) 647 { 648 struct scsi_device *sdev = to_scsi_device(dev); 649 struct gendisk *disk; 650 struct scsi_cd *cd; 651 int minor, error; 652 653 scsi_autopm_get_device(sdev); 654 error = -ENODEV; 655 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 656 goto fail; 657 658 error = -ENOMEM; 659 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 660 if (!cd) 661 goto fail; 662 663 kref_init(&cd->kref); 664 665 disk = __alloc_disk_node(sdev->request_queue, NUMA_NO_NODE, 666 &sr_bio_compl_lkclass); 667 if (!disk) 668 goto fail_free; 669 mutex_init(&cd->lock); 670 671 spin_lock(&sr_index_lock); 672 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 673 if (minor == SR_DISKS) { 674 spin_unlock(&sr_index_lock); 675 error = -EBUSY; 676 goto fail_put; 677 } 678 __set_bit(minor, sr_index_bits); 679 spin_unlock(&sr_index_lock); 680 681 disk->major = SCSI_CDROM_MAJOR; 682 disk->first_minor = minor; 683 disk->minors = 1; 684 sprintf(disk->disk_name, "sr%d", minor); 685 disk->fops = &sr_bdops; 686 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; 687 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 688 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT | 689 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE; 690 691 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 692 693 cd->device = sdev; 694 cd->disk = disk; 695 cd->driver = &sr_template; 696 cd->capacity = 0x1fffff; 697 cd->device->changed = 1; /* force recheck CD type */ 698 cd->media_present = 1; 699 cd->use = 1; 700 cd->readcd_known = 0; 701 cd->readcd_cdda = 0; 702 703 cd->cdi.ops = &sr_dops; 704 cd->cdi.handle = cd; 705 cd->cdi.mask = 0; 706 cd->cdi.capacity = 1; 707 sprintf(cd->cdi.name, "sr%d", minor); 708 709 sdev->sector_size = 2048; /* A guess, just in case */ 710 711 /* FIXME: need to handle a get_capabilities failure properly ?? */ 712 get_capabilities(cd); 713 sr_vendor_init(cd); 714 715 set_capacity(disk, cd->capacity); 716 disk->private_data = &cd->driver; 717 718 if (register_cdrom(disk, &cd->cdi)) 719 goto fail_minor; 720 721 /* 722 * Initialize block layer runtime PM stuffs before the 723 * periodic event checking request gets started in add_disk. 724 */ 725 blk_pm_runtime_init(sdev->request_queue, dev); 726 727 dev_set_drvdata(dev, cd); 728 sr_revalidate_disk(cd); 729 730 error = device_add_disk(&sdev->sdev_gendev, disk, NULL); 731 if (error) { 732 kref_put(&cd->kref, sr_kref_release); 733 goto fail; 734 } 735 736 sdev_printk(KERN_DEBUG, sdev, 737 "Attached scsi CD-ROM %s\n", cd->cdi.name); 738 scsi_autopm_put_device(cd->device); 739 740 return 0; 741 742 fail_minor: 743 spin_lock(&sr_index_lock); 744 clear_bit(minor, sr_index_bits); 745 spin_unlock(&sr_index_lock); 746 fail_put: 747 put_disk(disk); 748 mutex_destroy(&cd->lock); 749 fail_free: 750 kfree(cd); 751 fail: 752 scsi_autopm_put_device(sdev); 753 return error; 754 } 755 756 757 static void get_sectorsize(struct scsi_cd *cd) 758 { 759 unsigned char cmd[10]; 760 unsigned char buffer[8]; 761 int the_result, retries = 3; 762 int sector_size; 763 struct request_queue *queue; 764 765 do { 766 cmd[0] = READ_CAPACITY; 767 memset((void *) &cmd[1], 0, 9); 768 memset(buffer, 0, sizeof(buffer)); 769 770 /* Do the command and wait.. */ 771 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 772 buffer, sizeof(buffer), NULL, 773 SR_TIMEOUT, MAX_RETRIES, NULL); 774 775 retries--; 776 777 } while (the_result && retries); 778 779 780 if (the_result) { 781 cd->capacity = 0x1fffff; 782 sector_size = 2048; /* A guess, just in case */ 783 } else { 784 long last_written; 785 786 cd->capacity = 1 + get_unaligned_be32(&buffer[0]); 787 /* 788 * READ_CAPACITY doesn't return the correct size on 789 * certain UDF media. If last_written is larger, use 790 * it instead. 791 * 792 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 793 */ 794 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 795 cd->capacity = max_t(long, cd->capacity, last_written); 796 797 sector_size = get_unaligned_be32(&buffer[4]); 798 switch (sector_size) { 799 /* 800 * HP 4020i CD-Recorder reports 2340 byte sectors 801 * Philips CD-Writers report 2352 byte sectors 802 * 803 * Use 2k sectors for them.. 804 */ 805 case 0: 806 case 2340: 807 case 2352: 808 sector_size = 2048; 809 fallthrough; 810 case 2048: 811 cd->capacity *= 4; 812 fallthrough; 813 case 512: 814 break; 815 default: 816 sr_printk(KERN_INFO, cd, 817 "unsupported sector size %d.", sector_size); 818 cd->capacity = 0; 819 } 820 821 cd->device->sector_size = sector_size; 822 823 /* 824 * Add this so that we have the ability to correctly gauge 825 * what the device is capable of. 826 */ 827 set_capacity(cd->disk, cd->capacity); 828 } 829 830 queue = cd->device->request_queue; 831 blk_queue_logical_block_size(queue, sector_size); 832 833 return; 834 } 835 836 static void get_capabilities(struct scsi_cd *cd) 837 { 838 unsigned char *buffer; 839 struct scsi_mode_data data; 840 struct scsi_sense_hdr sshdr; 841 unsigned int ms_len = 128; 842 int rc, n; 843 844 static const char *loadmech[] = 845 { 846 "caddy", 847 "tray", 848 "pop-up", 849 "", 850 "changer", 851 "cartridge changer", 852 "", 853 "" 854 }; 855 856 857 /* allocate transfer buffer */ 858 buffer = kmalloc(512, GFP_KERNEL); 859 if (!buffer) { 860 sr_printk(KERN_ERR, cd, "out of memory.\n"); 861 return; 862 } 863 864 /* eat unit attentions */ 865 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 866 867 /* ask for mode page 0x2a */ 868 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 869 SR_TIMEOUT, 3, &data, NULL); 870 871 if (rc < 0 || data.length > ms_len || 872 data.header_length + data.block_descriptor_length > data.length) { 873 /* failed, drive doesn't have capabilities mode page */ 874 cd->cdi.speed = 1; 875 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 876 CDC_DVD | CDC_DVD_RAM | 877 CDC_SELECT_DISC | CDC_SELECT_SPEED | 878 CDC_MRW | CDC_MRW_W | CDC_RAM); 879 kfree(buffer); 880 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 881 return; 882 } 883 884 n = data.header_length + data.block_descriptor_length; 885 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; 886 cd->readcd_known = 1; 887 cd->readcd_cdda = buffer[n + 5] & 0x01; 888 /* print some capability bits */ 889 sr_printk(KERN_INFO, cd, 890 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 891 get_unaligned_be16(&buffer[n + 14]) / 176, 892 cd->cdi.speed, 893 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 894 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 895 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 896 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 897 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 898 loadmech[buffer[n + 6] >> 5]); 899 if ((buffer[n + 6] >> 5) == 0) 900 /* caddy drives can't close tray... */ 901 cd->cdi.mask |= CDC_CLOSE_TRAY; 902 if ((buffer[n + 2] & 0x8) == 0) 903 /* not a DVD drive */ 904 cd->cdi.mask |= CDC_DVD; 905 if ((buffer[n + 3] & 0x20) == 0) 906 /* can't write DVD-RAM media */ 907 cd->cdi.mask |= CDC_DVD_RAM; 908 if ((buffer[n + 3] & 0x10) == 0) 909 /* can't write DVD-R media */ 910 cd->cdi.mask |= CDC_DVD_R; 911 if ((buffer[n + 3] & 0x2) == 0) 912 /* can't write CD-RW media */ 913 cd->cdi.mask |= CDC_CD_RW; 914 if ((buffer[n + 3] & 0x1) == 0) 915 /* can't write CD-R media */ 916 cd->cdi.mask |= CDC_CD_R; 917 if ((buffer[n + 6] & 0x8) == 0) 918 /* can't eject */ 919 cd->cdi.mask |= CDC_OPEN_TRAY; 920 921 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 922 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 923 cd->cdi.capacity = 924 cdrom_number_of_slots(&cd->cdi); 925 if (cd->cdi.capacity <= 1) 926 /* not a changer */ 927 cd->cdi.mask |= CDC_SELECT_DISC; 928 /*else I don't think it can close its tray 929 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 930 931 /* 932 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 933 */ 934 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 935 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 936 cd->writeable = 1; 937 } 938 939 kfree(buffer); 940 } 941 942 /* 943 * sr_packet() is the entry point for the generic commands generated 944 * by the Uniform CD-ROM layer. 945 */ 946 static int sr_packet(struct cdrom_device_info *cdi, 947 struct packet_command *cgc) 948 { 949 struct scsi_cd *cd = cdi->handle; 950 struct scsi_device *sdev = cd->device; 951 952 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 953 return -EDRIVE_CANT_DO_THIS; 954 955 if (cgc->timeout <= 0) 956 cgc->timeout = IOCTL_TIMEOUT; 957 958 sr_do_ioctl(cd, cgc); 959 960 return cgc->stat; 961 } 962 963 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, 964 u32 lba, u32 nr, u8 *last_sense) 965 { 966 struct gendisk *disk = cdi->disk; 967 u32 len = nr * CD_FRAMESIZE_RAW; 968 struct scsi_request *req; 969 struct request *rq; 970 struct bio *bio; 971 int ret; 972 973 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0); 974 if (IS_ERR(rq)) 975 return PTR_ERR(rq); 976 req = scsi_req(rq); 977 978 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL); 979 if (ret) 980 goto out_put_request; 981 982 req->cmd[0] = GPCMD_READ_CD; 983 req->cmd[1] = 1 << 2; 984 req->cmd[2] = (lba >> 24) & 0xff; 985 req->cmd[3] = (lba >> 16) & 0xff; 986 req->cmd[4] = (lba >> 8) & 0xff; 987 req->cmd[5] = lba & 0xff; 988 req->cmd[6] = (nr >> 16) & 0xff; 989 req->cmd[7] = (nr >> 8) & 0xff; 990 req->cmd[8] = nr & 0xff; 991 req->cmd[9] = 0xf8; 992 req->cmd_len = 12; 993 rq->timeout = 60 * HZ; 994 bio = rq->bio; 995 996 blk_execute_rq(rq, false); 997 if (scsi_req(rq)->result) { 998 struct scsi_sense_hdr sshdr; 999 1000 scsi_normalize_sense(req->sense, req->sense_len, 1001 &sshdr); 1002 *last_sense = sshdr.sense_key; 1003 ret = -EIO; 1004 } 1005 1006 if (blk_rq_unmap_user(bio)) 1007 ret = -EFAULT; 1008 out_put_request: 1009 blk_mq_free_request(rq); 1010 return ret; 1011 } 1012 1013 1014 /** 1015 * sr_kref_release - Called to free the scsi_cd structure 1016 * @kref: pointer to embedded kref 1017 * 1018 * sr_ref_mutex must be held entering this routine. Because it is 1019 * called on last put, you should always use the scsi_cd_get() 1020 * scsi_cd_put() helpers which manipulate the semaphore directly 1021 * and never do a direct kref_put(). 1022 **/ 1023 static void sr_kref_release(struct kref *kref) 1024 { 1025 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 1026 struct gendisk *disk = cd->disk; 1027 1028 spin_lock(&sr_index_lock); 1029 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 1030 spin_unlock(&sr_index_lock); 1031 1032 unregister_cdrom(&cd->cdi); 1033 1034 disk->private_data = NULL; 1035 1036 put_disk(disk); 1037 1038 mutex_destroy(&cd->lock); 1039 1040 kfree(cd); 1041 } 1042 1043 static int sr_remove(struct device *dev) 1044 { 1045 struct scsi_cd *cd = dev_get_drvdata(dev); 1046 1047 scsi_autopm_get_device(cd->device); 1048 1049 del_gendisk(cd->disk); 1050 dev_set_drvdata(dev, NULL); 1051 1052 mutex_lock(&sr_ref_mutex); 1053 kref_put(&cd->kref, sr_kref_release); 1054 mutex_unlock(&sr_ref_mutex); 1055 1056 return 0; 1057 } 1058 1059 static int __init init_sr(void) 1060 { 1061 int rc; 1062 1063 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1064 if (rc) 1065 return rc; 1066 rc = scsi_register_driver(&sr_template.gendrv); 1067 if (rc) 1068 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1069 1070 return rc; 1071 } 1072 1073 static void __exit exit_sr(void) 1074 { 1075 scsi_unregister_driver(&sr_template.gendrv); 1076 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1077 } 1078 1079 module_init(init_sr); 1080 module_exit(exit_sr); 1081 MODULE_LICENSE("GPL"); 1082