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_alloc_sgtables(SCpnt); 396 if (ret != BLK_STS_OK) 397 return ret; 398 cd = scsi_cd(rq->rq_disk); 399 400 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 401 "Doing sr request, block = %d\n", block)); 402 403 if (!cd->device || !scsi_device_online(cd->device)) { 404 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 405 "Finishing %u sectors\n", blk_rq_sectors(rq))); 406 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 407 "Retry with 0x%p\n", SCpnt)); 408 goto out; 409 } 410 411 if (cd->device->changed) { 412 /* 413 * quietly refuse to do anything to a changed disc until the 414 * changed bit has been reset 415 */ 416 goto out; 417 } 418 419 s_size = cd->device->sector_size; 420 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 421 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 422 goto out; 423 } 424 425 switch (req_op(rq)) { 426 case REQ_OP_WRITE: 427 if (!cd->writeable) 428 goto out; 429 SCpnt->cmnd[0] = WRITE_10; 430 cd->cdi.media_written = 1; 431 break; 432 case REQ_OP_READ: 433 SCpnt->cmnd[0] = READ_10; 434 break; 435 default: 436 blk_dump_rq_flags(rq, "Unknown sr command"); 437 goto out; 438 } 439 440 { 441 struct scatterlist *sg; 442 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 443 444 scsi_for_each_sg(SCpnt, sg, sg_count, i) 445 size += sg->length; 446 447 if (size != scsi_bufflen(SCpnt)) { 448 scmd_printk(KERN_ERR, SCpnt, 449 "mismatch count %d, bytes %d\n", 450 size, scsi_bufflen(SCpnt)); 451 if (scsi_bufflen(SCpnt) > size) 452 SCpnt->sdb.length = size; 453 } 454 } 455 456 /* 457 * request doesn't start on hw block boundary, add scatter pads 458 */ 459 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 460 (scsi_bufflen(SCpnt) % s_size)) { 461 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 462 goto out; 463 } 464 465 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 466 467 468 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 469 "%s %d/%u 512 byte blocks.\n", 470 (rq_data_dir(rq) == WRITE) ? 471 "writing" : "reading", 472 this_count, blk_rq_sectors(rq))); 473 474 SCpnt->cmnd[1] = 0; 475 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 476 477 if (this_count > 0xffff) { 478 this_count = 0xffff; 479 SCpnt->sdb.length = this_count * s_size; 480 } 481 482 put_unaligned_be32(block, &SCpnt->cmnd[2]); 483 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 484 put_unaligned_be16(this_count, &SCpnt->cmnd[7]); 485 486 /* 487 * We shouldn't disconnect in the middle of a sector, so with a dumb 488 * host adapter, it's safe to assume that we can at least transfer 489 * this many bytes between each connect / disconnect. 490 */ 491 SCpnt->transfersize = cd->device->sector_size; 492 SCpnt->underflow = this_count << 9; 493 SCpnt->allowed = MAX_RETRIES; 494 SCpnt->cmd_len = 10; 495 496 /* 497 * This indicates that the command is ready from our end to be queued. 498 */ 499 return BLK_STS_OK; 500 out: 501 scsi_free_sgtables(SCpnt); 502 return BLK_STS_IOERR; 503 } 504 505 static void sr_revalidate_disk(struct scsi_cd *cd) 506 { 507 struct scsi_sense_hdr sshdr; 508 509 /* if the unit is not ready, nothing more to do */ 510 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 511 return; 512 sr_cd_check(&cd->cdi); 513 get_sectorsize(cd); 514 } 515 516 static int sr_block_open(struct block_device *bdev, fmode_t mode) 517 { 518 struct scsi_cd *cd; 519 struct scsi_device *sdev; 520 int ret = -ENXIO; 521 522 cd = scsi_cd_get(bdev->bd_disk); 523 if (!cd) 524 goto out; 525 526 sdev = cd->device; 527 scsi_autopm_get_device(sdev); 528 if (bdev_check_media_change(bdev)) 529 sr_revalidate_disk(cd); 530 531 mutex_lock(&cd->lock); 532 ret = cdrom_open(&cd->cdi, bdev, mode); 533 mutex_unlock(&cd->lock); 534 535 scsi_autopm_put_device(sdev); 536 if (ret) 537 scsi_cd_put(cd); 538 539 out: 540 return ret; 541 } 542 543 static void sr_block_release(struct gendisk *disk, fmode_t mode) 544 { 545 struct scsi_cd *cd = scsi_cd(disk); 546 547 mutex_lock(&cd->lock); 548 cdrom_release(&cd->cdi, mode); 549 mutex_unlock(&cd->lock); 550 551 scsi_cd_put(cd); 552 } 553 554 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 555 unsigned long arg) 556 { 557 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 558 struct scsi_device *sdev = cd->device; 559 void __user *argp = (void __user *)arg; 560 int ret; 561 562 mutex_lock(&cd->lock); 563 564 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 565 (mode & FMODE_NDELAY) != 0); 566 if (ret) 567 goto out; 568 569 scsi_autopm_get_device(sdev); 570 571 /* 572 * Send SCSI addressing ioctls directly to mid level, send other 573 * ioctls to cdrom/block level. 574 */ 575 switch (cmd) { 576 case SCSI_IOCTL_GET_IDLUN: 577 case SCSI_IOCTL_GET_BUS_NUMBER: 578 ret = scsi_ioctl(sdev, cmd, argp); 579 goto put; 580 } 581 582 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 583 if (ret != -ENOSYS) 584 goto put; 585 586 ret = scsi_ioctl(sdev, cmd, argp); 587 588 put: 589 scsi_autopm_put_device(sdev); 590 591 out: 592 mutex_unlock(&cd->lock); 593 return ret; 594 } 595 596 #ifdef CONFIG_COMPAT 597 static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 598 unsigned long arg) 599 { 600 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 601 struct scsi_device *sdev = cd->device; 602 void __user *argp = compat_ptr(arg); 603 int ret; 604 605 mutex_lock(&cd->lock); 606 607 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 608 (mode & FMODE_NDELAY) != 0); 609 if (ret) 610 goto out; 611 612 scsi_autopm_get_device(sdev); 613 614 /* 615 * Send SCSI addressing ioctls directly to mid level, send other 616 * ioctls to cdrom/block level. 617 */ 618 switch (cmd) { 619 case SCSI_IOCTL_GET_IDLUN: 620 case SCSI_IOCTL_GET_BUS_NUMBER: 621 ret = scsi_compat_ioctl(sdev, cmd, argp); 622 goto put; 623 } 624 625 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp); 626 if (ret != -ENOSYS) 627 goto put; 628 629 ret = scsi_compat_ioctl(sdev, cmd, argp); 630 631 put: 632 scsi_autopm_put_device(sdev); 633 634 out: 635 mutex_unlock(&cd->lock); 636 return ret; 637 638 } 639 #endif 640 641 static unsigned int sr_block_check_events(struct gendisk *disk, 642 unsigned int clearing) 643 { 644 unsigned int ret = 0; 645 struct scsi_cd *cd; 646 647 cd = scsi_cd_get(disk); 648 if (!cd) 649 return 0; 650 651 if (!atomic_read(&cd->device->disk_events_disable_depth)) 652 ret = cdrom_check_events(&cd->cdi, clearing); 653 654 scsi_cd_put(cd); 655 return ret; 656 } 657 658 static const struct block_device_operations sr_bdops = 659 { 660 .owner = THIS_MODULE, 661 .open = sr_block_open, 662 .release = sr_block_release, 663 .ioctl = sr_block_ioctl, 664 #ifdef CONFIG_COMPAT 665 .compat_ioctl = sr_block_compat_ioctl, 666 #endif 667 .check_events = sr_block_check_events, 668 }; 669 670 static int sr_open(struct cdrom_device_info *cdi, int purpose) 671 { 672 struct scsi_cd *cd = cdi->handle; 673 struct scsi_device *sdev = cd->device; 674 int retval; 675 676 /* 677 * If the device is in error recovery, wait until it is done. 678 * If the device is offline, then disallow any access to it. 679 */ 680 retval = -ENXIO; 681 if (!scsi_block_when_processing_errors(sdev)) 682 goto error_out; 683 684 return 0; 685 686 error_out: 687 return retval; 688 } 689 690 static void sr_release(struct cdrom_device_info *cdi) 691 { 692 } 693 694 static int sr_probe(struct device *dev) 695 { 696 struct scsi_device *sdev = to_scsi_device(dev); 697 struct gendisk *disk; 698 struct scsi_cd *cd; 699 int minor, error; 700 701 scsi_autopm_get_device(sdev); 702 error = -ENODEV; 703 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 704 goto fail; 705 706 error = -ENOMEM; 707 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 708 if (!cd) 709 goto fail; 710 711 kref_init(&cd->kref); 712 713 disk = alloc_disk(1); 714 if (!disk) 715 goto fail_free; 716 mutex_init(&cd->lock); 717 718 spin_lock(&sr_index_lock); 719 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 720 if (minor == SR_DISKS) { 721 spin_unlock(&sr_index_lock); 722 error = -EBUSY; 723 goto fail_put; 724 } 725 __set_bit(minor, sr_index_bits); 726 spin_unlock(&sr_index_lock); 727 728 disk->major = SCSI_CDROM_MAJOR; 729 disk->first_minor = minor; 730 sprintf(disk->disk_name, "sr%d", minor); 731 disk->fops = &sr_bdops; 732 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 733 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 734 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; 735 736 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 737 738 cd->device = sdev; 739 cd->disk = disk; 740 cd->driver = &sr_template; 741 cd->disk = disk; 742 cd->capacity = 0x1fffff; 743 cd->device->changed = 1; /* force recheck CD type */ 744 cd->media_present = 1; 745 cd->use = 1; 746 cd->readcd_known = 0; 747 cd->readcd_cdda = 0; 748 749 cd->cdi.ops = &sr_dops; 750 cd->cdi.handle = cd; 751 cd->cdi.mask = 0; 752 cd->cdi.capacity = 1; 753 sprintf(cd->cdi.name, "sr%d", minor); 754 755 sdev->sector_size = 2048; /* A guess, just in case */ 756 757 /* FIXME: need to handle a get_capabilities failure properly ?? */ 758 get_capabilities(cd); 759 sr_vendor_init(cd); 760 761 set_capacity(disk, cd->capacity); 762 disk->private_data = &cd->driver; 763 disk->queue = sdev->request_queue; 764 765 if (register_cdrom(disk, &cd->cdi)) 766 goto fail_minor; 767 768 /* 769 * Initialize block layer runtime PM stuffs before the 770 * periodic event checking request gets started in add_disk. 771 */ 772 blk_pm_runtime_init(sdev->request_queue, dev); 773 774 dev_set_drvdata(dev, cd); 775 disk->flags |= GENHD_FL_REMOVABLE; 776 sr_revalidate_disk(cd); 777 device_add_disk(&sdev->sdev_gendev, disk, NULL); 778 779 sdev_printk(KERN_DEBUG, sdev, 780 "Attached scsi CD-ROM %s\n", cd->cdi.name); 781 scsi_autopm_put_device(cd->device); 782 783 return 0; 784 785 fail_minor: 786 spin_lock(&sr_index_lock); 787 clear_bit(minor, sr_index_bits); 788 spin_unlock(&sr_index_lock); 789 fail_put: 790 put_disk(disk); 791 mutex_destroy(&cd->lock); 792 fail_free: 793 kfree(cd); 794 fail: 795 scsi_autopm_put_device(sdev); 796 return error; 797 } 798 799 800 static void get_sectorsize(struct scsi_cd *cd) 801 { 802 unsigned char cmd[10]; 803 unsigned char buffer[8]; 804 int the_result, retries = 3; 805 int sector_size; 806 struct request_queue *queue; 807 808 do { 809 cmd[0] = READ_CAPACITY; 810 memset((void *) &cmd[1], 0, 9); 811 memset(buffer, 0, sizeof(buffer)); 812 813 /* Do the command and wait.. */ 814 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 815 buffer, sizeof(buffer), NULL, 816 SR_TIMEOUT, MAX_RETRIES, NULL); 817 818 retries--; 819 820 } while (the_result && retries); 821 822 823 if (the_result) { 824 cd->capacity = 0x1fffff; 825 sector_size = 2048; /* A guess, just in case */ 826 } else { 827 long last_written; 828 829 cd->capacity = 1 + get_unaligned_be32(&buffer[0]); 830 /* 831 * READ_CAPACITY doesn't return the correct size on 832 * certain UDF media. If last_written is larger, use 833 * it instead. 834 * 835 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 836 */ 837 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 838 cd->capacity = max_t(long, cd->capacity, last_written); 839 840 sector_size = get_unaligned_be32(&buffer[4]); 841 switch (sector_size) { 842 /* 843 * HP 4020i CD-Recorder reports 2340 byte sectors 844 * Philips CD-Writers report 2352 byte sectors 845 * 846 * Use 2k sectors for them.. 847 */ 848 case 0: 849 case 2340: 850 case 2352: 851 sector_size = 2048; 852 fallthrough; 853 case 2048: 854 cd->capacity *= 4; 855 fallthrough; 856 case 512: 857 break; 858 default: 859 sr_printk(KERN_INFO, cd, 860 "unsupported sector size %d.", sector_size); 861 cd->capacity = 0; 862 } 863 864 cd->device->sector_size = sector_size; 865 866 /* 867 * Add this so that we have the ability to correctly gauge 868 * what the device is capable of. 869 */ 870 set_capacity(cd->disk, cd->capacity); 871 } 872 873 queue = cd->device->request_queue; 874 blk_queue_logical_block_size(queue, sector_size); 875 876 return; 877 } 878 879 static void get_capabilities(struct scsi_cd *cd) 880 { 881 unsigned char *buffer; 882 struct scsi_mode_data data; 883 struct scsi_sense_hdr sshdr; 884 unsigned int ms_len = 128; 885 int rc, n; 886 887 static const char *loadmech[] = 888 { 889 "caddy", 890 "tray", 891 "pop-up", 892 "", 893 "changer", 894 "cartridge changer", 895 "", 896 "" 897 }; 898 899 900 /* allocate transfer buffer */ 901 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 902 if (!buffer) { 903 sr_printk(KERN_ERR, cd, "out of memory.\n"); 904 return; 905 } 906 907 /* eat unit attentions */ 908 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 909 910 /* ask for mode page 0x2a */ 911 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 912 SR_TIMEOUT, 3, &data, NULL); 913 914 if (!scsi_status_is_good(rc) || data.length > ms_len || 915 data.header_length + data.block_descriptor_length > data.length) { 916 /* failed, drive doesn't have capabilities mode page */ 917 cd->cdi.speed = 1; 918 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 919 CDC_DVD | CDC_DVD_RAM | 920 CDC_SELECT_DISC | CDC_SELECT_SPEED | 921 CDC_MRW | CDC_MRW_W | CDC_RAM); 922 kfree(buffer); 923 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 924 return; 925 } 926 927 n = data.header_length + data.block_descriptor_length; 928 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; 929 cd->readcd_known = 1; 930 cd->readcd_cdda = buffer[n + 5] & 0x01; 931 /* print some capability bits */ 932 sr_printk(KERN_INFO, cd, 933 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 934 get_unaligned_be16(&buffer[n + 14]) / 176, 935 cd->cdi.speed, 936 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 937 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 938 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 939 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 940 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 941 loadmech[buffer[n + 6] >> 5]); 942 if ((buffer[n + 6] >> 5) == 0) 943 /* caddy drives can't close tray... */ 944 cd->cdi.mask |= CDC_CLOSE_TRAY; 945 if ((buffer[n + 2] & 0x8) == 0) 946 /* not a DVD drive */ 947 cd->cdi.mask |= CDC_DVD; 948 if ((buffer[n + 3] & 0x20) == 0) 949 /* can't write DVD-RAM media */ 950 cd->cdi.mask |= CDC_DVD_RAM; 951 if ((buffer[n + 3] & 0x10) == 0) 952 /* can't write DVD-R media */ 953 cd->cdi.mask |= CDC_DVD_R; 954 if ((buffer[n + 3] & 0x2) == 0) 955 /* can't write CD-RW media */ 956 cd->cdi.mask |= CDC_CD_RW; 957 if ((buffer[n + 3] & 0x1) == 0) 958 /* can't write CD-R media */ 959 cd->cdi.mask |= CDC_CD_R; 960 if ((buffer[n + 6] & 0x8) == 0) 961 /* can't eject */ 962 cd->cdi.mask |= CDC_OPEN_TRAY; 963 964 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 965 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 966 cd->cdi.capacity = 967 cdrom_number_of_slots(&cd->cdi); 968 if (cd->cdi.capacity <= 1) 969 /* not a changer */ 970 cd->cdi.mask |= CDC_SELECT_DISC; 971 /*else I don't think it can close its tray 972 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 973 974 /* 975 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 976 */ 977 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 978 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 979 cd->writeable = 1; 980 } 981 982 kfree(buffer); 983 } 984 985 /* 986 * sr_packet() is the entry point for the generic commands generated 987 * by the Uniform CD-ROM layer. 988 */ 989 static int sr_packet(struct cdrom_device_info *cdi, 990 struct packet_command *cgc) 991 { 992 struct scsi_cd *cd = cdi->handle; 993 struct scsi_device *sdev = cd->device; 994 995 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 996 return -EDRIVE_CANT_DO_THIS; 997 998 if (cgc->timeout <= 0) 999 cgc->timeout = IOCTL_TIMEOUT; 1000 1001 sr_do_ioctl(cd, cgc); 1002 1003 return cgc->stat; 1004 } 1005 1006 /** 1007 * sr_kref_release - Called to free the scsi_cd structure 1008 * @kref: pointer to embedded kref 1009 * 1010 * sr_ref_mutex must be held entering this routine. Because it is 1011 * called on last put, you should always use the scsi_cd_get() 1012 * scsi_cd_put() helpers which manipulate the semaphore directly 1013 * and never do a direct kref_put(). 1014 **/ 1015 static void sr_kref_release(struct kref *kref) 1016 { 1017 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 1018 struct gendisk *disk = cd->disk; 1019 1020 spin_lock(&sr_index_lock); 1021 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 1022 spin_unlock(&sr_index_lock); 1023 1024 unregister_cdrom(&cd->cdi); 1025 1026 disk->private_data = NULL; 1027 1028 put_disk(disk); 1029 1030 mutex_destroy(&cd->lock); 1031 1032 kfree(cd); 1033 } 1034 1035 static int sr_remove(struct device *dev) 1036 { 1037 struct scsi_cd *cd = dev_get_drvdata(dev); 1038 1039 scsi_autopm_get_device(cd->device); 1040 1041 del_gendisk(cd->disk); 1042 dev_set_drvdata(dev, NULL); 1043 1044 mutex_lock(&sr_ref_mutex); 1045 kref_put(&cd->kref, sr_kref_release); 1046 mutex_unlock(&sr_ref_mutex); 1047 1048 return 0; 1049 } 1050 1051 static int __init init_sr(void) 1052 { 1053 int rc; 1054 1055 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1056 if (rc) 1057 return rc; 1058 rc = scsi_register_driver(&sr_template.gendrv); 1059 if (rc) 1060 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1061 1062 return rc; 1063 } 1064 1065 static void __exit exit_sr(void) 1066 { 1067 scsi_unregister_driver(&sr_template.gendrv); 1068 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1069 } 1070 1071 module_init(init_sr); 1072 module_exit(exit_sr); 1073 MODULE_LICENSE("GPL"); 1074