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/blkdev.h> 48 #include <linux/blk-pm.h> 49 #include <linux/mutex.h> 50 #include <linux/slab.h> 51 #include <linux/pm_runtime.h> 52 #include <linux/uaccess.h> 53 54 #include <asm/unaligned.h> 55 56 #include <scsi/scsi.h> 57 #include <scsi/scsi_dbg.h> 58 #include <scsi/scsi_device.h> 59 #include <scsi/scsi_driver.h> 60 #include <scsi/scsi_cmnd.h> 61 #include <scsi/scsi_eh.h> 62 #include <scsi/scsi_host.h> 63 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 64 65 #include "scsi_logging.h" 66 #include "sr.h" 67 68 69 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 70 MODULE_LICENSE("GPL"); 71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 72 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 73 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 74 75 #define SR_DISKS 256 76 77 #define SR_CAPABILITIES \ 78 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 79 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 80 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 81 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 82 CDC_MRW|CDC_MRW_W|CDC_RAM) 83 84 static int sr_probe(struct device *); 85 static int sr_remove(struct device *); 86 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); 87 static int sr_done(struct scsi_cmnd *); 88 static int sr_runtime_suspend(struct device *dev); 89 90 static const struct dev_pm_ops sr_pm_ops = { 91 .runtime_suspend = sr_runtime_suspend, 92 }; 93 94 static struct scsi_driver sr_template = { 95 .gendrv = { 96 .name = "sr", 97 .owner = THIS_MODULE, 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 /* This semaphore is used to mediate the 0->1 reference get in the 110 * face of object destruction (i.e. we can't allow a get on an 111 * object after last put) */ 112 static DEFINE_MUTEX(sr_ref_mutex); 113 114 static int sr_open(struct cdrom_device_info *, int); 115 static void sr_release(struct cdrom_device_info *); 116 117 static void get_sectorsize(struct scsi_cd *); 118 static void get_capabilities(struct scsi_cd *); 119 120 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 121 unsigned int clearing, int slot); 122 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 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 .capability = SR_CAPABILITIES, 137 .generic_packet = sr_packet, 138 }; 139 140 static void sr_kref_release(struct kref *kref); 141 142 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 143 { 144 return container_of(disk->private_data, struct scsi_cd, driver); 145 } 146 147 static int sr_runtime_suspend(struct device *dev) 148 { 149 struct scsi_cd *cd = dev_get_drvdata(dev); 150 151 if (!cd) /* E.g.: runtime suspend following sr_remove() */ 152 return 0; 153 154 if (cd->media_present) 155 return -EBUSY; 156 else 157 return 0; 158 } 159 160 /* 161 * The get and put routines for the struct scsi_cd. Note this entity 162 * has a scsi_device pointer and owns a reference to this. 163 */ 164 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 165 { 166 struct scsi_cd *cd = NULL; 167 168 mutex_lock(&sr_ref_mutex); 169 if (disk->private_data == NULL) 170 goto out; 171 cd = scsi_cd(disk); 172 kref_get(&cd->kref); 173 if (scsi_device_get(cd->device)) { 174 kref_put(&cd->kref, sr_kref_release); 175 cd = NULL; 176 } 177 out: 178 mutex_unlock(&sr_ref_mutex); 179 return cd; 180 } 181 182 static void scsi_cd_put(struct scsi_cd *cd) 183 { 184 struct scsi_device *sdev = cd->device; 185 186 mutex_lock(&sr_ref_mutex); 187 kref_put(&cd->kref, sr_kref_release); 188 scsi_device_put(sdev); 189 mutex_unlock(&sr_ref_mutex); 190 } 191 192 static unsigned int sr_get_events(struct scsi_device *sdev) 193 { 194 u8 buf[8]; 195 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 196 1, /* polled */ 197 0, 0, /* reserved */ 198 1 << 4, /* notification class: media */ 199 0, 0, /* reserved */ 200 0, sizeof(buf), /* allocation length */ 201 0, /* control */ 202 }; 203 struct event_header *eh = (void *)buf; 204 struct media_event_desc *med = (void *)(buf + 4); 205 struct scsi_sense_hdr sshdr; 206 int result; 207 208 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 209 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 210 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 211 return DISK_EVENT_MEDIA_CHANGE; 212 213 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 214 return 0; 215 216 if (eh->nea || eh->notification_class != 0x4) 217 return 0; 218 219 if (med->media_event_code == 1) 220 return DISK_EVENT_EJECT_REQUEST; 221 else if (med->media_event_code == 2) 222 return DISK_EVENT_MEDIA_CHANGE; 223 else if (med->media_event_code == 3) 224 return DISK_EVENT_MEDIA_CHANGE; 225 return 0; 226 } 227 228 /* 229 * This function checks to see if the media has been changed or eject 230 * button has been pressed. It is possible that we have already 231 * sensed a change, or the drive may have sensed one and not yet 232 * reported it. The past events are accumulated in sdev->changed and 233 * returned together with the current state. 234 */ 235 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 236 unsigned int clearing, int slot) 237 { 238 struct scsi_cd *cd = cdi->handle; 239 bool last_present; 240 struct scsi_sense_hdr sshdr; 241 unsigned int events; 242 int ret; 243 244 /* no changer support */ 245 if (CDSL_CURRENT != slot) 246 return 0; 247 248 events = sr_get_events(cd->device); 249 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 250 251 /* 252 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 253 * for several times in a row. We rely on TUR only for this likely 254 * broken device, to prevent generating incorrect media changed 255 * events for every open(). 256 */ 257 if (cd->ignore_get_event) { 258 events &= ~DISK_EVENT_MEDIA_CHANGE; 259 goto do_tur; 260 } 261 262 /* 263 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 264 * is being cleared. Note that there are devices which hang 265 * if asked to execute TUR repeatedly. 266 */ 267 if (cd->device->changed) { 268 events |= DISK_EVENT_MEDIA_CHANGE; 269 cd->device->changed = 0; 270 cd->tur_changed = true; 271 } 272 273 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 274 return events; 275 do_tur: 276 /* let's see whether the media is there with TUR */ 277 last_present = cd->media_present; 278 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 279 280 /* 281 * Media is considered to be present if TUR succeeds or fails with 282 * sense data indicating something other than media-not-present 283 * (ASC 0x3a). 284 */ 285 cd->media_present = scsi_status_is_good(ret) || 286 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 287 288 if (last_present != cd->media_present) 289 cd->device->changed = 1; 290 291 if (cd->device->changed) { 292 events |= DISK_EVENT_MEDIA_CHANGE; 293 cd->device->changed = 0; 294 cd->tur_changed = true; 295 } 296 297 if (cd->ignore_get_event) 298 return events; 299 300 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 301 if (!cd->tur_changed) { 302 if (cd->get_event_changed) { 303 if (cd->tur_mismatch++ > 8) { 304 sr_printk(KERN_WARNING, cd, 305 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 306 cd->ignore_get_event = true; 307 } 308 } else { 309 cd->tur_mismatch = 0; 310 } 311 } 312 cd->tur_changed = false; 313 cd->get_event_changed = false; 314 315 return events; 316 } 317 318 /* 319 * sr_done is the interrupt routine for the device driver. 320 * 321 * It will be notified on the end of a SCSI read / write, and will take one 322 * of several actions based on success or failure. 323 */ 324 static int sr_done(struct scsi_cmnd *SCpnt) 325 { 326 int result = SCpnt->result; 327 int this_count = scsi_bufflen(SCpnt); 328 int good_bytes = (result == 0 ? this_count : 0); 329 int block_sectors = 0; 330 long error_sector; 331 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 332 333 #ifdef DEBUG 334 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 335 #endif 336 337 /* 338 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 339 * success. Since this is a relatively rare error condition, no 340 * care is taken to avoid unnecessary additional work such as 341 * memcpy's that could be avoided. 342 */ 343 if (scsi_status_is_check_condition(result) && 344 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 345 switch (SCpnt->sense_buffer[2]) { 346 case MEDIUM_ERROR: 347 case VOLUME_OVERFLOW: 348 case ILLEGAL_REQUEST: 349 if (!(SCpnt->sense_buffer[0] & 0x90)) 350 break; 351 error_sector = 352 get_unaligned_be32(&SCpnt->sense_buffer[3]); 353 if (SCpnt->request->bio != NULL) 354 block_sectors = 355 bio_sectors(SCpnt->request->bio); 356 if (block_sectors < 4) 357 block_sectors = 4; 358 if (cd->device->sector_size == 2048) 359 error_sector <<= 2; 360 error_sector &= ~(block_sectors - 1); 361 good_bytes = (error_sector - 362 blk_rq_pos(SCpnt->request)) << 9; 363 if (good_bytes < 0 || good_bytes >= this_count) 364 good_bytes = 0; 365 /* 366 * The SCSI specification allows for the value 367 * returned by READ CAPACITY to be up to 75 2K 368 * sectors past the last readable block. 369 * Therefore, if we hit a medium error within the 370 * last 75 2K sectors, we decrease the saved size 371 * value. 372 */ 373 if (error_sector < get_capacity(cd->disk) && 374 cd->capacity - error_sector < 4 * 75) 375 set_capacity(cd->disk, error_sector); 376 break; 377 378 case RECOVERED_ERROR: 379 good_bytes = this_count; 380 break; 381 382 default: 383 break; 384 } 385 } 386 387 return good_bytes; 388 } 389 390 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) 391 { 392 int block = 0, this_count, s_size; 393 struct scsi_cd *cd; 394 struct request *rq = SCpnt->request; 395 blk_status_t ret; 396 397 ret = scsi_alloc_sgtables(SCpnt); 398 if (ret != BLK_STS_OK) 399 return ret; 400 cd = scsi_cd(rq->rq_disk); 401 402 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 403 "Doing sr request, block = %d\n", block)); 404 405 if (!cd->device || !scsi_device_online(cd->device)) { 406 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 407 "Finishing %u sectors\n", blk_rq_sectors(rq))); 408 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 409 "Retry with 0x%p\n", SCpnt)); 410 goto out; 411 } 412 413 if (cd->device->changed) { 414 /* 415 * quietly refuse to do anything to a changed disc until the 416 * changed bit has been reset 417 */ 418 goto out; 419 } 420 421 s_size = cd->device->sector_size; 422 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 423 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 424 goto out; 425 } 426 427 switch (req_op(rq)) { 428 case REQ_OP_WRITE: 429 if (!cd->writeable) 430 goto out; 431 SCpnt->cmnd[0] = WRITE_10; 432 cd->cdi.media_written = 1; 433 break; 434 case REQ_OP_READ: 435 SCpnt->cmnd[0] = READ_10; 436 break; 437 default: 438 blk_dump_rq_flags(rq, "Unknown sr command"); 439 goto out; 440 } 441 442 { 443 struct scatterlist *sg; 444 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 445 446 scsi_for_each_sg(SCpnt, sg, sg_count, i) 447 size += sg->length; 448 449 if (size != scsi_bufflen(SCpnt)) { 450 scmd_printk(KERN_ERR, SCpnt, 451 "mismatch count %d, bytes %d\n", 452 size, scsi_bufflen(SCpnt)); 453 if (scsi_bufflen(SCpnt) > size) 454 SCpnt->sdb.length = size; 455 } 456 } 457 458 /* 459 * request doesn't start on hw block boundary, add scatter pads 460 */ 461 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 462 (scsi_bufflen(SCpnt) % s_size)) { 463 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 464 goto out; 465 } 466 467 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 468 469 470 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 471 "%s %d/%u 512 byte blocks.\n", 472 (rq_data_dir(rq) == WRITE) ? 473 "writing" : "reading", 474 this_count, blk_rq_sectors(rq))); 475 476 SCpnt->cmnd[1] = 0; 477 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 478 479 if (this_count > 0xffff) { 480 this_count = 0xffff; 481 SCpnt->sdb.length = this_count * s_size; 482 } 483 484 put_unaligned_be32(block, &SCpnt->cmnd[2]); 485 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 486 put_unaligned_be16(this_count, &SCpnt->cmnd[7]); 487 488 /* 489 * We shouldn't disconnect in the middle of a sector, so with a dumb 490 * host adapter, it's safe to assume that we can at least transfer 491 * this many bytes between each connect / disconnect. 492 */ 493 SCpnt->transfersize = cd->device->sector_size; 494 SCpnt->underflow = this_count << 9; 495 SCpnt->allowed = MAX_RETRIES; 496 SCpnt->cmd_len = 10; 497 498 /* 499 * This indicates that the command is ready from our end to be queued. 500 */ 501 return BLK_STS_OK; 502 out: 503 scsi_free_sgtables(SCpnt); 504 return BLK_STS_IOERR; 505 } 506 507 static void sr_revalidate_disk(struct scsi_cd *cd) 508 { 509 struct scsi_sense_hdr sshdr; 510 511 /* if the unit is not ready, nothing more to do */ 512 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 513 return; 514 sr_cd_check(&cd->cdi); 515 get_sectorsize(cd); 516 } 517 518 static int sr_block_open(struct block_device *bdev, fmode_t mode) 519 { 520 struct scsi_cd *cd; 521 struct scsi_device *sdev; 522 int ret = -ENXIO; 523 524 cd = scsi_cd_get(bdev->bd_disk); 525 if (!cd) 526 goto out; 527 528 sdev = cd->device; 529 scsi_autopm_get_device(sdev); 530 if (bdev_check_media_change(bdev)) 531 sr_revalidate_disk(cd); 532 533 mutex_lock(&cd->lock); 534 ret = cdrom_open(&cd->cdi, bdev, mode); 535 mutex_unlock(&cd->lock); 536 537 scsi_autopm_put_device(sdev); 538 if (ret) 539 scsi_cd_put(cd); 540 541 out: 542 return ret; 543 } 544 545 static void sr_block_release(struct gendisk *disk, fmode_t mode) 546 { 547 struct scsi_cd *cd = scsi_cd(disk); 548 549 mutex_lock(&cd->lock); 550 cdrom_release(&cd->cdi, mode); 551 mutex_unlock(&cd->lock); 552 553 scsi_cd_put(cd); 554 } 555 556 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 557 unsigned long arg) 558 { 559 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 560 struct scsi_device *sdev = cd->device; 561 void __user *argp = (void __user *)arg; 562 int ret; 563 564 mutex_lock(&cd->lock); 565 566 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 567 (mode & FMODE_NDELAY) != 0); 568 if (ret) 569 goto out; 570 571 scsi_autopm_get_device(sdev); 572 573 /* 574 * Send SCSI addressing ioctls directly to mid level, send other 575 * ioctls to cdrom/block level. 576 */ 577 switch (cmd) { 578 case SCSI_IOCTL_GET_IDLUN: 579 case SCSI_IOCTL_GET_BUS_NUMBER: 580 ret = scsi_ioctl(sdev, cmd, argp); 581 goto put; 582 } 583 584 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 585 if (ret != -ENOSYS) 586 goto put; 587 588 ret = scsi_ioctl(sdev, cmd, argp); 589 590 put: 591 scsi_autopm_put_device(sdev); 592 593 out: 594 mutex_unlock(&cd->lock); 595 return ret; 596 } 597 598 #ifdef CONFIG_COMPAT 599 static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 600 unsigned long arg) 601 { 602 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 603 struct scsi_device *sdev = cd->device; 604 void __user *argp = compat_ptr(arg); 605 int ret; 606 607 mutex_lock(&cd->lock); 608 609 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 610 (mode & FMODE_NDELAY) != 0); 611 if (ret) 612 goto out; 613 614 scsi_autopm_get_device(sdev); 615 616 /* 617 * Send SCSI addressing ioctls directly to mid level, send other 618 * ioctls to cdrom/block level. 619 */ 620 switch (cmd) { 621 case SCSI_IOCTL_GET_IDLUN: 622 case SCSI_IOCTL_GET_BUS_NUMBER: 623 ret = scsi_compat_ioctl(sdev, cmd, argp); 624 goto put; 625 } 626 627 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp); 628 if (ret != -ENOSYS) 629 goto put; 630 631 ret = scsi_compat_ioctl(sdev, cmd, argp); 632 633 put: 634 scsi_autopm_put_device(sdev); 635 636 out: 637 mutex_unlock(&cd->lock); 638 return ret; 639 640 } 641 #endif 642 643 static unsigned int sr_block_check_events(struct gendisk *disk, 644 unsigned int clearing) 645 { 646 unsigned int ret = 0; 647 struct scsi_cd *cd; 648 649 cd = scsi_cd_get(disk); 650 if (!cd) 651 return 0; 652 653 if (!atomic_read(&cd->device->disk_events_disable_depth)) 654 ret = cdrom_check_events(&cd->cdi, clearing); 655 656 scsi_cd_put(cd); 657 return ret; 658 } 659 660 static const struct block_device_operations sr_bdops = 661 { 662 .owner = THIS_MODULE, 663 .open = sr_block_open, 664 .release = sr_block_release, 665 .ioctl = sr_block_ioctl, 666 #ifdef CONFIG_COMPAT 667 .compat_ioctl = sr_block_compat_ioctl, 668 #endif 669 .check_events = sr_block_check_events, 670 }; 671 672 static int sr_open(struct cdrom_device_info *cdi, int purpose) 673 { 674 struct scsi_cd *cd = cdi->handle; 675 struct scsi_device *sdev = cd->device; 676 int retval; 677 678 /* 679 * If the device is in error recovery, wait until it is done. 680 * If the device is offline, then disallow any access to it. 681 */ 682 retval = -ENXIO; 683 if (!scsi_block_when_processing_errors(sdev)) 684 goto error_out; 685 686 return 0; 687 688 error_out: 689 return retval; 690 } 691 692 static void sr_release(struct cdrom_device_info *cdi) 693 { 694 } 695 696 static int sr_probe(struct device *dev) 697 { 698 struct scsi_device *sdev = to_scsi_device(dev); 699 struct gendisk *disk; 700 struct scsi_cd *cd; 701 int minor, error; 702 703 scsi_autopm_get_device(sdev); 704 error = -ENODEV; 705 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 706 goto fail; 707 708 error = -ENOMEM; 709 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 710 if (!cd) 711 goto fail; 712 713 kref_init(&cd->kref); 714 715 disk = alloc_disk(1); 716 if (!disk) 717 goto fail_free; 718 mutex_init(&cd->lock); 719 720 spin_lock(&sr_index_lock); 721 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 722 if (minor == SR_DISKS) { 723 spin_unlock(&sr_index_lock); 724 error = -EBUSY; 725 goto fail_put; 726 } 727 __set_bit(minor, sr_index_bits); 728 spin_unlock(&sr_index_lock); 729 730 disk->major = SCSI_CDROM_MAJOR; 731 disk->first_minor = minor; 732 sprintf(disk->disk_name, "sr%d", minor); 733 disk->fops = &sr_bdops; 734 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 735 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 736 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; 737 738 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 739 740 cd->device = sdev; 741 cd->disk = disk; 742 cd->driver = &sr_template; 743 cd->disk = disk; 744 cd->capacity = 0x1fffff; 745 cd->device->changed = 1; /* force recheck CD type */ 746 cd->media_present = 1; 747 cd->use = 1; 748 cd->readcd_known = 0; 749 cd->readcd_cdda = 0; 750 751 cd->cdi.ops = &sr_dops; 752 cd->cdi.handle = cd; 753 cd->cdi.mask = 0; 754 cd->cdi.capacity = 1; 755 sprintf(cd->cdi.name, "sr%d", minor); 756 757 sdev->sector_size = 2048; /* A guess, just in case */ 758 759 /* FIXME: need to handle a get_capabilities failure properly ?? */ 760 get_capabilities(cd); 761 sr_vendor_init(cd); 762 763 set_capacity(disk, cd->capacity); 764 disk->private_data = &cd->driver; 765 disk->queue = sdev->request_queue; 766 767 if (register_cdrom(disk, &cd->cdi)) 768 goto fail_minor; 769 770 /* 771 * Initialize block layer runtime PM stuffs before the 772 * periodic event checking request gets started in add_disk. 773 */ 774 blk_pm_runtime_init(sdev->request_queue, dev); 775 776 dev_set_drvdata(dev, cd); 777 disk->flags |= GENHD_FL_REMOVABLE; 778 sr_revalidate_disk(cd); 779 device_add_disk(&sdev->sdev_gendev, disk, NULL); 780 781 sdev_printk(KERN_DEBUG, sdev, 782 "Attached scsi CD-ROM %s\n", cd->cdi.name); 783 scsi_autopm_put_device(cd->device); 784 785 return 0; 786 787 fail_minor: 788 spin_lock(&sr_index_lock); 789 clear_bit(minor, sr_index_bits); 790 spin_unlock(&sr_index_lock); 791 fail_put: 792 put_disk(disk); 793 mutex_destroy(&cd->lock); 794 fail_free: 795 kfree(cd); 796 fail: 797 scsi_autopm_put_device(sdev); 798 return error; 799 } 800 801 802 static void get_sectorsize(struct scsi_cd *cd) 803 { 804 unsigned char cmd[10]; 805 unsigned char buffer[8]; 806 int the_result, retries = 3; 807 int sector_size; 808 struct request_queue *queue; 809 810 do { 811 cmd[0] = READ_CAPACITY; 812 memset((void *) &cmd[1], 0, 9); 813 memset(buffer, 0, sizeof(buffer)); 814 815 /* Do the command and wait.. */ 816 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 817 buffer, sizeof(buffer), NULL, 818 SR_TIMEOUT, MAX_RETRIES, NULL); 819 820 retries--; 821 822 } while (the_result && retries); 823 824 825 if (the_result) { 826 cd->capacity = 0x1fffff; 827 sector_size = 2048; /* A guess, just in case */ 828 } else { 829 long last_written; 830 831 cd->capacity = 1 + get_unaligned_be32(&buffer[0]); 832 /* 833 * READ_CAPACITY doesn't return the correct size on 834 * certain UDF media. If last_written is larger, use 835 * it instead. 836 * 837 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 838 */ 839 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 840 cd->capacity = max_t(long, cd->capacity, last_written); 841 842 sector_size = get_unaligned_be32(&buffer[4]); 843 switch (sector_size) { 844 /* 845 * HP 4020i CD-Recorder reports 2340 byte sectors 846 * Philips CD-Writers report 2352 byte sectors 847 * 848 * Use 2k sectors for them.. 849 */ 850 case 0: 851 case 2340: 852 case 2352: 853 sector_size = 2048; 854 fallthrough; 855 case 2048: 856 cd->capacity *= 4; 857 fallthrough; 858 case 512: 859 break; 860 default: 861 sr_printk(KERN_INFO, cd, 862 "unsupported sector size %d.", sector_size); 863 cd->capacity = 0; 864 } 865 866 cd->device->sector_size = sector_size; 867 868 /* 869 * Add this so that we have the ability to correctly gauge 870 * what the device is capable of. 871 */ 872 set_capacity(cd->disk, cd->capacity); 873 } 874 875 queue = cd->device->request_queue; 876 blk_queue_logical_block_size(queue, sector_size); 877 878 return; 879 } 880 881 static void get_capabilities(struct scsi_cd *cd) 882 { 883 unsigned char *buffer; 884 struct scsi_mode_data data; 885 struct scsi_sense_hdr sshdr; 886 unsigned int ms_len = 128; 887 int rc, n; 888 889 static const char *loadmech[] = 890 { 891 "caddy", 892 "tray", 893 "pop-up", 894 "", 895 "changer", 896 "cartridge changer", 897 "", 898 "" 899 }; 900 901 902 /* allocate transfer buffer */ 903 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 904 if (!buffer) { 905 sr_printk(KERN_ERR, cd, "out of memory.\n"); 906 return; 907 } 908 909 /* eat unit attentions */ 910 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 911 912 /* ask for mode page 0x2a */ 913 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 914 SR_TIMEOUT, 3, &data, NULL); 915 916 if (rc < 0 || data.length > ms_len || 917 data.header_length + data.block_descriptor_length > data.length) { 918 /* failed, drive doesn't have capabilities mode page */ 919 cd->cdi.speed = 1; 920 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 921 CDC_DVD | CDC_DVD_RAM | 922 CDC_SELECT_DISC | CDC_SELECT_SPEED | 923 CDC_MRW | CDC_MRW_W | CDC_RAM); 924 kfree(buffer); 925 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 926 return; 927 } 928 929 n = data.header_length + data.block_descriptor_length; 930 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; 931 cd->readcd_known = 1; 932 cd->readcd_cdda = buffer[n + 5] & 0x01; 933 /* print some capability bits */ 934 sr_printk(KERN_INFO, cd, 935 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 936 get_unaligned_be16(&buffer[n + 14]) / 176, 937 cd->cdi.speed, 938 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 939 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 940 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 941 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 942 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 943 loadmech[buffer[n + 6] >> 5]); 944 if ((buffer[n + 6] >> 5) == 0) 945 /* caddy drives can't close tray... */ 946 cd->cdi.mask |= CDC_CLOSE_TRAY; 947 if ((buffer[n + 2] & 0x8) == 0) 948 /* not a DVD drive */ 949 cd->cdi.mask |= CDC_DVD; 950 if ((buffer[n + 3] & 0x20) == 0) 951 /* can't write DVD-RAM media */ 952 cd->cdi.mask |= CDC_DVD_RAM; 953 if ((buffer[n + 3] & 0x10) == 0) 954 /* can't write DVD-R media */ 955 cd->cdi.mask |= CDC_DVD_R; 956 if ((buffer[n + 3] & 0x2) == 0) 957 /* can't write CD-RW media */ 958 cd->cdi.mask |= CDC_CD_RW; 959 if ((buffer[n + 3] & 0x1) == 0) 960 /* can't write CD-R media */ 961 cd->cdi.mask |= CDC_CD_R; 962 if ((buffer[n + 6] & 0x8) == 0) 963 /* can't eject */ 964 cd->cdi.mask |= CDC_OPEN_TRAY; 965 966 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 967 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 968 cd->cdi.capacity = 969 cdrom_number_of_slots(&cd->cdi); 970 if (cd->cdi.capacity <= 1) 971 /* not a changer */ 972 cd->cdi.mask |= CDC_SELECT_DISC; 973 /*else I don't think it can close its tray 974 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 975 976 /* 977 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 978 */ 979 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 980 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 981 cd->writeable = 1; 982 } 983 984 kfree(buffer); 985 } 986 987 /* 988 * sr_packet() is the entry point for the generic commands generated 989 * by the Uniform CD-ROM layer. 990 */ 991 static int sr_packet(struct cdrom_device_info *cdi, 992 struct packet_command *cgc) 993 { 994 struct scsi_cd *cd = cdi->handle; 995 struct scsi_device *sdev = cd->device; 996 997 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 998 return -EDRIVE_CANT_DO_THIS; 999 1000 if (cgc->timeout <= 0) 1001 cgc->timeout = IOCTL_TIMEOUT; 1002 1003 sr_do_ioctl(cd, cgc); 1004 1005 return cgc->stat; 1006 } 1007 1008 /** 1009 * sr_kref_release - Called to free the scsi_cd structure 1010 * @kref: pointer to embedded kref 1011 * 1012 * sr_ref_mutex must be held entering this routine. Because it is 1013 * called on last put, you should always use the scsi_cd_get() 1014 * scsi_cd_put() helpers which manipulate the semaphore directly 1015 * and never do a direct kref_put(). 1016 **/ 1017 static void sr_kref_release(struct kref *kref) 1018 { 1019 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 1020 struct gendisk *disk = cd->disk; 1021 1022 spin_lock(&sr_index_lock); 1023 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 1024 spin_unlock(&sr_index_lock); 1025 1026 unregister_cdrom(&cd->cdi); 1027 1028 disk->private_data = NULL; 1029 1030 put_disk(disk); 1031 1032 mutex_destroy(&cd->lock); 1033 1034 kfree(cd); 1035 } 1036 1037 static int sr_remove(struct device *dev) 1038 { 1039 struct scsi_cd *cd = dev_get_drvdata(dev); 1040 1041 scsi_autopm_get_device(cd->device); 1042 1043 del_gendisk(cd->disk); 1044 dev_set_drvdata(dev, NULL); 1045 1046 mutex_lock(&sr_ref_mutex); 1047 kref_put(&cd->kref, sr_kref_release); 1048 mutex_unlock(&sr_ref_mutex); 1049 1050 return 0; 1051 } 1052 1053 static int __init init_sr(void) 1054 { 1055 int rc; 1056 1057 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1058 if (rc) 1059 return rc; 1060 rc = scsi_register_driver(&sr_template.gendrv); 1061 if (rc) 1062 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1063 1064 return rc; 1065 } 1066 1067 static void __exit exit_sr(void) 1068 { 1069 scsi_unregister_driver(&sr_template.gendrv); 1070 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1071 } 1072 1073 module_init(init_sr); 1074 module_exit(exit_sr); 1075 MODULE_LICENSE("GPL"); 1076