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 return 0; 224 } 225 226 /* 227 * This function checks to see if the media has been changed or eject 228 * button has been pressed. It is possible that we have already 229 * sensed a change, or the drive may have sensed one and not yet 230 * reported it. The past events are accumulated in sdev->changed and 231 * returned together with the current state. 232 */ 233 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 234 unsigned int clearing, int slot) 235 { 236 struct scsi_cd *cd = cdi->handle; 237 bool last_present; 238 struct scsi_sense_hdr sshdr; 239 unsigned int events; 240 int ret; 241 242 /* no changer support */ 243 if (CDSL_CURRENT != slot) 244 return 0; 245 246 events = sr_get_events(cd->device); 247 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 248 249 /* 250 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 251 * for several times in a row. We rely on TUR only for this likely 252 * broken device, to prevent generating incorrect media changed 253 * events for every open(). 254 */ 255 if (cd->ignore_get_event) { 256 events &= ~DISK_EVENT_MEDIA_CHANGE; 257 goto do_tur; 258 } 259 260 /* 261 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 262 * is being cleared. Note that there are devices which hang 263 * if asked to execute TUR repeatedly. 264 */ 265 if (cd->device->changed) { 266 events |= DISK_EVENT_MEDIA_CHANGE; 267 cd->device->changed = 0; 268 cd->tur_changed = true; 269 } 270 271 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 272 return events; 273 do_tur: 274 /* let's see whether the media is there with TUR */ 275 last_present = cd->media_present; 276 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 277 278 /* 279 * Media is considered to be present if TUR succeeds or fails with 280 * sense data indicating something other than media-not-present 281 * (ASC 0x3a). 282 */ 283 cd->media_present = scsi_status_is_good(ret) || 284 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 285 286 if (last_present != cd->media_present) 287 cd->device->changed = 1; 288 289 if (cd->device->changed) { 290 events |= DISK_EVENT_MEDIA_CHANGE; 291 cd->device->changed = 0; 292 cd->tur_changed = true; 293 } 294 295 if (cd->ignore_get_event) 296 return events; 297 298 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 299 if (!cd->tur_changed) { 300 if (cd->get_event_changed) { 301 if (cd->tur_mismatch++ > 8) { 302 sr_printk(KERN_WARNING, cd, 303 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 304 cd->ignore_get_event = true; 305 } 306 } else { 307 cd->tur_mismatch = 0; 308 } 309 } 310 cd->tur_changed = false; 311 cd->get_event_changed = false; 312 313 return events; 314 } 315 316 /* 317 * sr_done is the interrupt routine for the device driver. 318 * 319 * It will be notified on the end of a SCSI read / write, and will take one 320 * of several actions based on success or failure. 321 */ 322 static int sr_done(struct scsi_cmnd *SCpnt) 323 { 324 int result = SCpnt->result; 325 int this_count = scsi_bufflen(SCpnt); 326 int good_bytes = (result == 0 ? this_count : 0); 327 int block_sectors = 0; 328 long error_sector; 329 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 330 331 #ifdef DEBUG 332 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 333 #endif 334 335 /* 336 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 337 * success. Since this is a relatively rare error condition, no 338 * care is taken to avoid unnecessary additional work such as 339 * memcpy's that could be avoided. 340 */ 341 if (driver_byte(result) != 0 && /* An error occurred */ 342 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 343 switch (SCpnt->sense_buffer[2]) { 344 case MEDIUM_ERROR: 345 case VOLUME_OVERFLOW: 346 case ILLEGAL_REQUEST: 347 if (!(SCpnt->sense_buffer[0] & 0x90)) 348 break; 349 error_sector = 350 get_unaligned_be32(&SCpnt->sense_buffer[3]); 351 if (SCpnt->request->bio != NULL) 352 block_sectors = 353 bio_sectors(SCpnt->request->bio); 354 if (block_sectors < 4) 355 block_sectors = 4; 356 if (cd->device->sector_size == 2048) 357 error_sector <<= 2; 358 error_sector &= ~(block_sectors - 1); 359 good_bytes = (error_sector - 360 blk_rq_pos(SCpnt->request)) << 9; 361 if (good_bytes < 0 || good_bytes >= this_count) 362 good_bytes = 0; 363 /* 364 * The SCSI specification allows for the value 365 * returned by READ CAPACITY to be up to 75 2K 366 * sectors past the last readable block. 367 * Therefore, if we hit a medium error within the 368 * last 75 2K sectors, we decrease the saved size 369 * value. 370 */ 371 if (error_sector < get_capacity(cd->disk) && 372 cd->capacity - error_sector < 4 * 75) 373 set_capacity(cd->disk, error_sector); 374 break; 375 376 case RECOVERED_ERROR: 377 good_bytes = this_count; 378 break; 379 380 default: 381 break; 382 } 383 } 384 385 return good_bytes; 386 } 387 388 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) 389 { 390 int block = 0, this_count, s_size; 391 struct scsi_cd *cd; 392 struct request *rq = SCpnt->request; 393 blk_status_t ret; 394 395 ret = scsi_init_io(SCpnt); 396 if (ret != BLK_STS_OK) 397 goto out; 398 cd = scsi_cd(rq->rq_disk); 399 400 /* from here on until we're complete, any goto out 401 * is used for a killable error condition */ 402 ret = BLK_STS_IOERR; 403 404 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 405 "Doing sr request, block = %d\n", block)); 406 407 if (!cd->device || !scsi_device_online(cd->device)) { 408 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 409 "Finishing %u sectors\n", blk_rq_sectors(rq))); 410 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 411 "Retry with 0x%p\n", SCpnt)); 412 goto out; 413 } 414 415 if (cd->device->changed) { 416 /* 417 * quietly refuse to do anything to a changed disc until the 418 * changed bit has been reset 419 */ 420 goto out; 421 } 422 423 /* 424 * we do lazy blocksize switching (when reading XA sectors, 425 * see CDROMREADMODE2 ioctl) 426 */ 427 s_size = cd->device->sector_size; 428 if (s_size > 2048) { 429 if (!in_interrupt()) 430 sr_set_blocklength(cd, 2048); 431 else 432 scmd_printk(KERN_INFO, SCpnt, 433 "can't switch blocksize: in interrupt\n"); 434 } 435 436 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 437 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 438 goto out; 439 } 440 441 switch (req_op(rq)) { 442 case REQ_OP_WRITE: 443 if (!cd->writeable) 444 goto out; 445 SCpnt->cmnd[0] = WRITE_10; 446 cd->cdi.media_written = 1; 447 break; 448 case REQ_OP_READ: 449 SCpnt->cmnd[0] = READ_10; 450 break; 451 default: 452 blk_dump_rq_flags(rq, "Unknown sr command"); 453 goto out; 454 } 455 456 { 457 struct scatterlist *sg; 458 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 459 460 scsi_for_each_sg(SCpnt, sg, sg_count, i) 461 size += sg->length; 462 463 if (size != scsi_bufflen(SCpnt)) { 464 scmd_printk(KERN_ERR, SCpnt, 465 "mismatch count %d, bytes %d\n", 466 size, scsi_bufflen(SCpnt)); 467 if (scsi_bufflen(SCpnt) > size) 468 SCpnt->sdb.length = size; 469 } 470 } 471 472 /* 473 * request doesn't start on hw block boundary, add scatter pads 474 */ 475 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 476 (scsi_bufflen(SCpnt) % s_size)) { 477 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 478 goto out; 479 } 480 481 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 482 483 484 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 485 "%s %d/%u 512 byte blocks.\n", 486 (rq_data_dir(rq) == WRITE) ? 487 "writing" : "reading", 488 this_count, blk_rq_sectors(rq))); 489 490 SCpnt->cmnd[1] = 0; 491 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 492 493 if (this_count > 0xffff) { 494 this_count = 0xffff; 495 SCpnt->sdb.length = this_count * s_size; 496 } 497 498 put_unaligned_be32(block, &SCpnt->cmnd[2]); 499 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 500 put_unaligned_be16(this_count, &SCpnt->cmnd[7]); 501 502 /* 503 * We shouldn't disconnect in the middle of a sector, so with a dumb 504 * host adapter, it's safe to assume that we can at least transfer 505 * this many bytes between each connect / disconnect. 506 */ 507 SCpnt->transfersize = cd->device->sector_size; 508 SCpnt->underflow = this_count << 9; 509 SCpnt->allowed = MAX_RETRIES; 510 511 /* 512 * This indicates that the command is ready from our end to be 513 * queued. 514 */ 515 ret = BLK_STS_OK; 516 out: 517 return ret; 518 } 519 520 static void sr_revalidate_disk(struct scsi_cd *cd) 521 { 522 struct scsi_sense_hdr sshdr; 523 524 /* if the unit is not ready, nothing more to do */ 525 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 526 return; 527 sr_cd_check(&cd->cdi); 528 get_sectorsize(cd); 529 } 530 531 static int sr_block_open(struct block_device *bdev, fmode_t mode) 532 { 533 struct scsi_cd *cd; 534 struct scsi_device *sdev; 535 int ret = -ENXIO; 536 537 cd = scsi_cd_get(bdev->bd_disk); 538 if (!cd) 539 goto out; 540 541 sdev = cd->device; 542 scsi_autopm_get_device(sdev); 543 if (bdev_check_media_change(bdev)) 544 sr_revalidate_disk(cd); 545 546 mutex_lock(&cd->lock); 547 ret = cdrom_open(&cd->cdi, bdev, mode); 548 mutex_unlock(&cd->lock); 549 550 scsi_autopm_put_device(sdev); 551 if (ret) 552 scsi_cd_put(cd); 553 554 out: 555 return ret; 556 } 557 558 static void sr_block_release(struct gendisk *disk, fmode_t mode) 559 { 560 struct scsi_cd *cd = scsi_cd(disk); 561 562 mutex_lock(&cd->lock); 563 cdrom_release(&cd->cdi, mode); 564 mutex_unlock(&cd->lock); 565 566 scsi_cd_put(cd); 567 } 568 569 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 570 unsigned long arg) 571 { 572 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 573 struct scsi_device *sdev = cd->device; 574 void __user *argp = (void __user *)arg; 575 int ret; 576 577 mutex_lock(&cd->lock); 578 579 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 580 (mode & FMODE_NDELAY) != 0); 581 if (ret) 582 goto out; 583 584 scsi_autopm_get_device(sdev); 585 586 /* 587 * Send SCSI addressing ioctls directly to mid level, send other 588 * ioctls to cdrom/block level. 589 */ 590 switch (cmd) { 591 case SCSI_IOCTL_GET_IDLUN: 592 case SCSI_IOCTL_GET_BUS_NUMBER: 593 ret = scsi_ioctl(sdev, cmd, argp); 594 goto put; 595 } 596 597 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 598 if (ret != -ENOSYS) 599 goto put; 600 601 ret = scsi_ioctl(sdev, cmd, argp); 602 603 put: 604 scsi_autopm_put_device(sdev); 605 606 out: 607 mutex_unlock(&cd->lock); 608 return ret; 609 } 610 611 #ifdef CONFIG_COMPAT 612 static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 613 unsigned long arg) 614 { 615 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 616 struct scsi_device *sdev = cd->device; 617 void __user *argp = compat_ptr(arg); 618 int ret; 619 620 mutex_lock(&cd->lock); 621 622 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 623 (mode & FMODE_NDELAY) != 0); 624 if (ret) 625 goto out; 626 627 scsi_autopm_get_device(sdev); 628 629 /* 630 * Send SCSI addressing ioctls directly to mid level, send other 631 * ioctls to cdrom/block level. 632 */ 633 switch (cmd) { 634 case SCSI_IOCTL_GET_IDLUN: 635 case SCSI_IOCTL_GET_BUS_NUMBER: 636 ret = scsi_compat_ioctl(sdev, cmd, argp); 637 goto put; 638 } 639 640 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp); 641 if (ret != -ENOSYS) 642 goto put; 643 644 ret = scsi_compat_ioctl(sdev, cmd, argp); 645 646 put: 647 scsi_autopm_put_device(sdev); 648 649 out: 650 mutex_unlock(&cd->lock); 651 return ret; 652 653 } 654 #endif 655 656 static unsigned int sr_block_check_events(struct gendisk *disk, 657 unsigned int clearing) 658 { 659 unsigned int ret = 0; 660 struct scsi_cd *cd; 661 662 cd = scsi_cd_get(disk); 663 if (!cd) 664 return 0; 665 666 if (!atomic_read(&cd->device->disk_events_disable_depth)) 667 ret = cdrom_check_events(&cd->cdi, clearing); 668 669 scsi_cd_put(cd); 670 return ret; 671 } 672 673 static const struct block_device_operations sr_bdops = 674 { 675 .owner = THIS_MODULE, 676 .open = sr_block_open, 677 .release = sr_block_release, 678 .ioctl = sr_block_ioctl, 679 #ifdef CONFIG_COMPAT 680 .compat_ioctl = sr_block_compat_ioctl, 681 #endif 682 .check_events = sr_block_check_events, 683 }; 684 685 static int sr_open(struct cdrom_device_info *cdi, int purpose) 686 { 687 struct scsi_cd *cd = cdi->handle; 688 struct scsi_device *sdev = cd->device; 689 int retval; 690 691 /* 692 * If the device is in error recovery, wait until it is done. 693 * If the device is offline, then disallow any access to it. 694 */ 695 retval = -ENXIO; 696 if (!scsi_block_when_processing_errors(sdev)) 697 goto error_out; 698 699 return 0; 700 701 error_out: 702 return retval; 703 } 704 705 static void sr_release(struct cdrom_device_info *cdi) 706 { 707 struct scsi_cd *cd = cdi->handle; 708 709 if (cd->device->sector_size > 2048) 710 sr_set_blocklength(cd, 2048); 711 712 } 713 714 static int sr_probe(struct device *dev) 715 { 716 struct scsi_device *sdev = to_scsi_device(dev); 717 struct gendisk *disk; 718 struct scsi_cd *cd; 719 int minor, error; 720 721 scsi_autopm_get_device(sdev); 722 error = -ENODEV; 723 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 724 goto fail; 725 726 error = -ENOMEM; 727 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 728 if (!cd) 729 goto fail; 730 731 kref_init(&cd->kref); 732 733 disk = alloc_disk(1); 734 if (!disk) 735 goto fail_free; 736 mutex_init(&cd->lock); 737 738 spin_lock(&sr_index_lock); 739 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 740 if (minor == SR_DISKS) { 741 spin_unlock(&sr_index_lock); 742 error = -EBUSY; 743 goto fail_put; 744 } 745 __set_bit(minor, sr_index_bits); 746 spin_unlock(&sr_index_lock); 747 748 disk->major = SCSI_CDROM_MAJOR; 749 disk->first_minor = minor; 750 sprintf(disk->disk_name, "sr%d", minor); 751 disk->fops = &sr_bdops; 752 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 753 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 754 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; 755 756 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 757 758 cd->device = sdev; 759 cd->disk = disk; 760 cd->driver = &sr_template; 761 cd->disk = disk; 762 cd->capacity = 0x1fffff; 763 cd->device->changed = 1; /* force recheck CD type */ 764 cd->media_present = 1; 765 cd->use = 1; 766 cd->readcd_known = 0; 767 cd->readcd_cdda = 0; 768 769 cd->cdi.ops = &sr_dops; 770 cd->cdi.handle = cd; 771 cd->cdi.mask = 0; 772 cd->cdi.capacity = 1; 773 sprintf(cd->cdi.name, "sr%d", minor); 774 775 sdev->sector_size = 2048; /* A guess, just in case */ 776 777 /* FIXME: need to handle a get_capabilities failure properly ?? */ 778 get_capabilities(cd); 779 sr_vendor_init(cd); 780 781 set_capacity(disk, cd->capacity); 782 disk->private_data = &cd->driver; 783 disk->queue = sdev->request_queue; 784 785 if (register_cdrom(disk, &cd->cdi)) 786 goto fail_minor; 787 788 /* 789 * Initialize block layer runtime PM stuffs before the 790 * periodic event checking request gets started in add_disk. 791 */ 792 blk_pm_runtime_init(sdev->request_queue, dev); 793 794 dev_set_drvdata(dev, cd); 795 disk->flags |= GENHD_FL_REMOVABLE; 796 sr_revalidate_disk(cd); 797 device_add_disk(&sdev->sdev_gendev, disk, NULL); 798 799 sdev_printk(KERN_DEBUG, sdev, 800 "Attached scsi CD-ROM %s\n", cd->cdi.name); 801 scsi_autopm_put_device(cd->device); 802 803 return 0; 804 805 fail_minor: 806 spin_lock(&sr_index_lock); 807 clear_bit(minor, sr_index_bits); 808 spin_unlock(&sr_index_lock); 809 fail_put: 810 put_disk(disk); 811 mutex_destroy(&cd->lock); 812 fail_free: 813 kfree(cd); 814 fail: 815 scsi_autopm_put_device(sdev); 816 return error; 817 } 818 819 820 static void get_sectorsize(struct scsi_cd *cd) 821 { 822 unsigned char cmd[10]; 823 unsigned char buffer[8]; 824 int the_result, retries = 3; 825 int sector_size; 826 struct request_queue *queue; 827 828 do { 829 cmd[0] = READ_CAPACITY; 830 memset((void *) &cmd[1], 0, 9); 831 memset(buffer, 0, sizeof(buffer)); 832 833 /* Do the command and wait.. */ 834 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 835 buffer, sizeof(buffer), NULL, 836 SR_TIMEOUT, MAX_RETRIES, NULL); 837 838 retries--; 839 840 } while (the_result && retries); 841 842 843 if (the_result) { 844 cd->capacity = 0x1fffff; 845 sector_size = 2048; /* A guess, just in case */ 846 } else { 847 long last_written; 848 849 cd->capacity = 1 + get_unaligned_be32(&buffer[0]); 850 /* 851 * READ_CAPACITY doesn't return the correct size on 852 * certain UDF media. If last_written is larger, use 853 * it instead. 854 * 855 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 856 */ 857 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 858 cd->capacity = max_t(long, cd->capacity, last_written); 859 860 sector_size = get_unaligned_be32(&buffer[4]); 861 switch (sector_size) { 862 /* 863 * HP 4020i CD-Recorder reports 2340 byte sectors 864 * Philips CD-Writers report 2352 byte sectors 865 * 866 * Use 2k sectors for them.. 867 */ 868 case 0: 869 case 2340: 870 case 2352: 871 sector_size = 2048; 872 fallthrough; 873 case 2048: 874 cd->capacity *= 4; 875 fallthrough; 876 case 512: 877 break; 878 default: 879 sr_printk(KERN_INFO, cd, 880 "unsupported sector size %d.", sector_size); 881 cd->capacity = 0; 882 } 883 884 cd->device->sector_size = sector_size; 885 886 /* 887 * Add this so that we have the ability to correctly gauge 888 * what the device is capable of. 889 */ 890 set_capacity(cd->disk, cd->capacity); 891 } 892 893 queue = cd->device->request_queue; 894 blk_queue_logical_block_size(queue, sector_size); 895 896 return; 897 } 898 899 static void get_capabilities(struct scsi_cd *cd) 900 { 901 unsigned char *buffer; 902 struct scsi_mode_data data; 903 struct scsi_sense_hdr sshdr; 904 unsigned int ms_len = 128; 905 int rc, n; 906 907 static const char *loadmech[] = 908 { 909 "caddy", 910 "tray", 911 "pop-up", 912 "", 913 "changer", 914 "cartridge changer", 915 "", 916 "" 917 }; 918 919 920 /* allocate transfer buffer */ 921 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 922 if (!buffer) { 923 sr_printk(KERN_ERR, cd, "out of memory.\n"); 924 return; 925 } 926 927 /* eat unit attentions */ 928 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 929 930 /* ask for mode page 0x2a */ 931 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 932 SR_TIMEOUT, 3, &data, NULL); 933 934 if (!scsi_status_is_good(rc) || data.length > ms_len || 935 data.header_length + data.block_descriptor_length > data.length) { 936 /* failed, drive doesn't have capabilities mode page */ 937 cd->cdi.speed = 1; 938 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 939 CDC_DVD | CDC_DVD_RAM | 940 CDC_SELECT_DISC | CDC_SELECT_SPEED | 941 CDC_MRW | CDC_MRW_W | CDC_RAM); 942 kfree(buffer); 943 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 944 return; 945 } 946 947 n = data.header_length + data.block_descriptor_length; 948 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; 949 cd->readcd_known = 1; 950 cd->readcd_cdda = buffer[n + 5] & 0x01; 951 /* print some capability bits */ 952 sr_printk(KERN_INFO, cd, 953 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 954 get_unaligned_be16(&buffer[n + 14]) / 176, 955 cd->cdi.speed, 956 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 957 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 958 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 959 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 960 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 961 loadmech[buffer[n + 6] >> 5]); 962 if ((buffer[n + 6] >> 5) == 0) 963 /* caddy drives can't close tray... */ 964 cd->cdi.mask |= CDC_CLOSE_TRAY; 965 if ((buffer[n + 2] & 0x8) == 0) 966 /* not a DVD drive */ 967 cd->cdi.mask |= CDC_DVD; 968 if ((buffer[n + 3] & 0x20) == 0) 969 /* can't write DVD-RAM media */ 970 cd->cdi.mask |= CDC_DVD_RAM; 971 if ((buffer[n + 3] & 0x10) == 0) 972 /* can't write DVD-R media */ 973 cd->cdi.mask |= CDC_DVD_R; 974 if ((buffer[n + 3] & 0x2) == 0) 975 /* can't write CD-RW media */ 976 cd->cdi.mask |= CDC_CD_RW; 977 if ((buffer[n + 3] & 0x1) == 0) 978 /* can't write CD-R media */ 979 cd->cdi.mask |= CDC_CD_R; 980 if ((buffer[n + 6] & 0x8) == 0) 981 /* can't eject */ 982 cd->cdi.mask |= CDC_OPEN_TRAY; 983 984 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 985 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 986 cd->cdi.capacity = 987 cdrom_number_of_slots(&cd->cdi); 988 if (cd->cdi.capacity <= 1) 989 /* not a changer */ 990 cd->cdi.mask |= CDC_SELECT_DISC; 991 /*else I don't think it can close its tray 992 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 993 994 /* 995 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 996 */ 997 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 998 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 999 cd->writeable = 1; 1000 } 1001 1002 kfree(buffer); 1003 } 1004 1005 /* 1006 * sr_packet() is the entry point for the generic commands generated 1007 * by the Uniform CD-ROM layer. 1008 */ 1009 static int sr_packet(struct cdrom_device_info *cdi, 1010 struct packet_command *cgc) 1011 { 1012 struct scsi_cd *cd = cdi->handle; 1013 struct scsi_device *sdev = cd->device; 1014 1015 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 1016 return -EDRIVE_CANT_DO_THIS; 1017 1018 if (cgc->timeout <= 0) 1019 cgc->timeout = IOCTL_TIMEOUT; 1020 1021 sr_do_ioctl(cd, cgc); 1022 1023 return cgc->stat; 1024 } 1025 1026 /** 1027 * sr_kref_release - Called to free the scsi_cd structure 1028 * @kref: pointer to embedded kref 1029 * 1030 * sr_ref_mutex must be held entering this routine. Because it is 1031 * called on last put, you should always use the scsi_cd_get() 1032 * scsi_cd_put() helpers which manipulate the semaphore directly 1033 * and never do a direct kref_put(). 1034 **/ 1035 static void sr_kref_release(struct kref *kref) 1036 { 1037 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 1038 struct gendisk *disk = cd->disk; 1039 1040 spin_lock(&sr_index_lock); 1041 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 1042 spin_unlock(&sr_index_lock); 1043 1044 unregister_cdrom(&cd->cdi); 1045 1046 disk->private_data = NULL; 1047 1048 put_disk(disk); 1049 1050 mutex_destroy(&cd->lock); 1051 1052 kfree(cd); 1053 } 1054 1055 static int sr_remove(struct device *dev) 1056 { 1057 struct scsi_cd *cd = dev_get_drvdata(dev); 1058 1059 scsi_autopm_get_device(cd->device); 1060 1061 del_gendisk(cd->disk); 1062 dev_set_drvdata(dev, NULL); 1063 1064 mutex_lock(&sr_ref_mutex); 1065 kref_put(&cd->kref, sr_kref_release); 1066 mutex_unlock(&sr_ref_mutex); 1067 1068 return 0; 1069 } 1070 1071 static int __init init_sr(void) 1072 { 1073 int rc; 1074 1075 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1076 if (rc) 1077 return rc; 1078 rc = scsi_register_driver(&sr_template.gendrv); 1079 if (rc) 1080 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1081 1082 return rc; 1083 } 1084 1085 static void __exit exit_sr(void) 1086 { 1087 scsi_unregister_driver(&sr_template.gendrv); 1088 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1089 } 1090 1091 module_init(init_sr); 1092 module_exit(exit_sr); 1093 MODULE_LICENSE("GPL"); 1094