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 static struct lock_class_key sr_bio_compl_lkclass; 110 111 /* This semaphore is used to mediate the 0->1 reference get in the 112 * face of object destruction (i.e. we can't allow a get on an 113 * object after last put) */ 114 static DEFINE_MUTEX(sr_ref_mutex); 115 116 static int sr_open(struct cdrom_device_info *, int); 117 static void sr_release(struct cdrom_device_info *); 118 119 static void get_sectorsize(struct scsi_cd *); 120 static void get_capabilities(struct scsi_cd *); 121 122 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 123 unsigned int clearing, int slot); 124 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 125 126 static const struct cdrom_device_ops sr_dops = { 127 .open = sr_open, 128 .release = sr_release, 129 .drive_status = sr_drive_status, 130 .check_events = sr_check_events, 131 .tray_move = sr_tray_move, 132 .lock_door = sr_lock_door, 133 .select_speed = sr_select_speed, 134 .get_last_session = sr_get_last_session, 135 .get_mcn = sr_get_mcn, 136 .reset = sr_reset, 137 .audio_ioctl = sr_audio_ioctl, 138 .capability = SR_CAPABILITIES, 139 .generic_packet = sr_packet, 140 }; 141 142 static void sr_kref_release(struct kref *kref); 143 144 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 145 { 146 return container_of(disk->private_data, struct scsi_cd, driver); 147 } 148 149 static int sr_runtime_suspend(struct device *dev) 150 { 151 struct scsi_cd *cd = dev_get_drvdata(dev); 152 153 if (!cd) /* E.g.: runtime suspend following sr_remove() */ 154 return 0; 155 156 if (cd->media_present) 157 return -EBUSY; 158 else 159 return 0; 160 } 161 162 /* 163 * The get and put routines for the struct scsi_cd. Note this entity 164 * has a scsi_device pointer and owns a reference to this. 165 */ 166 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 167 { 168 struct scsi_cd *cd = NULL; 169 170 mutex_lock(&sr_ref_mutex); 171 if (disk->private_data == NULL) 172 goto out; 173 cd = scsi_cd(disk); 174 kref_get(&cd->kref); 175 if (scsi_device_get(cd->device)) { 176 kref_put(&cd->kref, sr_kref_release); 177 cd = NULL; 178 } 179 out: 180 mutex_unlock(&sr_ref_mutex); 181 return cd; 182 } 183 184 static void scsi_cd_put(struct scsi_cd *cd) 185 { 186 struct scsi_device *sdev = cd->device; 187 188 mutex_lock(&sr_ref_mutex); 189 kref_put(&cd->kref, sr_kref_release); 190 scsi_device_put(sdev); 191 mutex_unlock(&sr_ref_mutex); 192 } 193 194 static unsigned int sr_get_events(struct scsi_device *sdev) 195 { 196 u8 buf[8]; 197 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 198 1, /* polled */ 199 0, 0, /* reserved */ 200 1 << 4, /* notification class: media */ 201 0, 0, /* reserved */ 202 0, sizeof(buf), /* allocation length */ 203 0, /* control */ 204 }; 205 struct event_header *eh = (void *)buf; 206 struct media_event_desc *med = (void *)(buf + 4); 207 struct scsi_sense_hdr sshdr; 208 int result; 209 210 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 211 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 212 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 213 return DISK_EVENT_MEDIA_CHANGE; 214 215 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 216 return 0; 217 218 if (eh->nea || eh->notification_class != 0x4) 219 return 0; 220 221 if (med->media_event_code == 1) 222 return DISK_EVENT_EJECT_REQUEST; 223 else if (med->media_event_code == 2) 224 return DISK_EVENT_MEDIA_CHANGE; 225 else if (med->media_event_code == 3) 226 return DISK_EVENT_MEDIA_CHANGE; 227 return 0; 228 } 229 230 /* 231 * This function checks to see if the media has been changed or eject 232 * button has been pressed. It is possible that we have already 233 * sensed a change, or the drive may have sensed one and not yet 234 * reported it. The past events are accumulated in sdev->changed and 235 * returned together with the current state. 236 */ 237 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 238 unsigned int clearing, int slot) 239 { 240 struct scsi_cd *cd = cdi->handle; 241 bool last_present; 242 struct scsi_sense_hdr sshdr; 243 unsigned int events; 244 int ret; 245 246 /* no changer support */ 247 if (CDSL_CURRENT != slot) 248 return 0; 249 250 events = sr_get_events(cd->device); 251 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 252 253 /* 254 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 255 * for several times in a row. We rely on TUR only for this likely 256 * broken device, to prevent generating incorrect media changed 257 * events for every open(). 258 */ 259 if (cd->ignore_get_event) { 260 events &= ~DISK_EVENT_MEDIA_CHANGE; 261 goto do_tur; 262 } 263 264 /* 265 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 266 * is being cleared. Note that there are devices which hang 267 * if asked to execute TUR repeatedly. 268 */ 269 if (cd->device->changed) { 270 events |= DISK_EVENT_MEDIA_CHANGE; 271 cd->device->changed = 0; 272 cd->tur_changed = true; 273 } 274 275 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 276 return events; 277 do_tur: 278 /* let's see whether the media is there with TUR */ 279 last_present = cd->media_present; 280 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 281 282 /* 283 * Media is considered to be present if TUR succeeds or fails with 284 * sense data indicating something other than media-not-present 285 * (ASC 0x3a). 286 */ 287 cd->media_present = scsi_status_is_good(ret) || 288 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 289 290 if (last_present != cd->media_present) 291 cd->device->changed = 1; 292 293 if (cd->device->changed) { 294 events |= DISK_EVENT_MEDIA_CHANGE; 295 cd->device->changed = 0; 296 cd->tur_changed = true; 297 } 298 299 if (cd->ignore_get_event) 300 return events; 301 302 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 303 if (!cd->tur_changed) { 304 if (cd->get_event_changed) { 305 if (cd->tur_mismatch++ > 8) { 306 sr_printk(KERN_WARNING, cd, 307 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 308 cd->ignore_get_event = true; 309 } 310 } else { 311 cd->tur_mismatch = 0; 312 } 313 } 314 cd->tur_changed = false; 315 cd->get_event_changed = false; 316 317 return events; 318 } 319 320 /* 321 * sr_done is the interrupt routine for the device driver. 322 * 323 * It will be notified on the end of a SCSI read / write, and will take one 324 * of several actions based on success or failure. 325 */ 326 static int sr_done(struct scsi_cmnd *SCpnt) 327 { 328 int result = SCpnt->result; 329 int this_count = scsi_bufflen(SCpnt); 330 int good_bytes = (result == 0 ? this_count : 0); 331 int block_sectors = 0; 332 long error_sector; 333 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 334 335 #ifdef DEBUG 336 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 337 #endif 338 339 /* 340 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 341 * success. Since this is a relatively rare error condition, no 342 * care is taken to avoid unnecessary additional work such as 343 * memcpy's that could be avoided. 344 */ 345 if (scsi_status_is_check_condition(result) && 346 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 347 switch (SCpnt->sense_buffer[2]) { 348 case MEDIUM_ERROR: 349 case VOLUME_OVERFLOW: 350 case ILLEGAL_REQUEST: 351 if (!(SCpnt->sense_buffer[0] & 0x90)) 352 break; 353 error_sector = 354 get_unaligned_be32(&SCpnt->sense_buffer[3]); 355 if (SCpnt->request->bio != NULL) 356 block_sectors = 357 bio_sectors(SCpnt->request->bio); 358 if (block_sectors < 4) 359 block_sectors = 4; 360 if (cd->device->sector_size == 2048) 361 error_sector <<= 2; 362 error_sector &= ~(block_sectors - 1); 363 good_bytes = (error_sector - 364 blk_rq_pos(SCpnt->request)) << 9; 365 if (good_bytes < 0 || good_bytes >= this_count) 366 good_bytes = 0; 367 /* 368 * The SCSI specification allows for the value 369 * returned by READ CAPACITY to be up to 75 2K 370 * sectors past the last readable block. 371 * Therefore, if we hit a medium error within the 372 * last 75 2K sectors, we decrease the saved size 373 * value. 374 */ 375 if (error_sector < get_capacity(cd->disk) && 376 cd->capacity - error_sector < 4 * 75) 377 set_capacity(cd->disk, error_sector); 378 break; 379 380 case RECOVERED_ERROR: 381 good_bytes = this_count; 382 break; 383 384 default: 385 break; 386 } 387 } 388 389 return good_bytes; 390 } 391 392 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) 393 { 394 int block = 0, this_count, s_size; 395 struct scsi_cd *cd; 396 struct request *rq = SCpnt->request; 397 blk_status_t ret; 398 399 ret = scsi_alloc_sgtables(SCpnt); 400 if (ret != BLK_STS_OK) 401 return ret; 402 cd = scsi_cd(rq->rq_disk); 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 s_size = cd->device->sector_size; 424 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 425 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 426 goto out; 427 } 428 429 switch (req_op(rq)) { 430 case REQ_OP_WRITE: 431 if (!cd->writeable) 432 goto out; 433 SCpnt->cmnd[0] = WRITE_10; 434 cd->cdi.media_written = 1; 435 break; 436 case REQ_OP_READ: 437 SCpnt->cmnd[0] = READ_10; 438 break; 439 default: 440 blk_dump_rq_flags(rq, "Unknown sr command"); 441 goto out; 442 } 443 444 { 445 struct scatterlist *sg; 446 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 447 448 scsi_for_each_sg(SCpnt, sg, sg_count, i) 449 size += sg->length; 450 451 if (size != scsi_bufflen(SCpnt)) { 452 scmd_printk(KERN_ERR, SCpnt, 453 "mismatch count %d, bytes %d\n", 454 size, scsi_bufflen(SCpnt)); 455 if (scsi_bufflen(SCpnt) > size) 456 SCpnt->sdb.length = size; 457 } 458 } 459 460 /* 461 * request doesn't start on hw block boundary, add scatter pads 462 */ 463 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 464 (scsi_bufflen(SCpnt) % s_size)) { 465 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 466 goto out; 467 } 468 469 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 470 471 472 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 473 "%s %d/%u 512 byte blocks.\n", 474 (rq_data_dir(rq) == WRITE) ? 475 "writing" : "reading", 476 this_count, blk_rq_sectors(rq))); 477 478 SCpnt->cmnd[1] = 0; 479 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 480 481 if (this_count > 0xffff) { 482 this_count = 0xffff; 483 SCpnt->sdb.length = this_count * s_size; 484 } 485 486 put_unaligned_be32(block, &SCpnt->cmnd[2]); 487 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 488 put_unaligned_be16(this_count, &SCpnt->cmnd[7]); 489 490 /* 491 * We shouldn't disconnect in the middle of a sector, so with a dumb 492 * host adapter, it's safe to assume that we can at least transfer 493 * this many bytes between each connect / disconnect. 494 */ 495 SCpnt->transfersize = cd->device->sector_size; 496 SCpnt->underflow = this_count << 9; 497 SCpnt->allowed = MAX_RETRIES; 498 SCpnt->cmd_len = 10; 499 500 /* 501 * This indicates that the command is ready from our end to be queued. 502 */ 503 return BLK_STS_OK; 504 out: 505 scsi_free_sgtables(SCpnt); 506 return BLK_STS_IOERR; 507 } 508 509 static void sr_revalidate_disk(struct scsi_cd *cd) 510 { 511 struct scsi_sense_hdr sshdr; 512 513 /* if the unit is not ready, nothing more to do */ 514 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 515 return; 516 sr_cd_check(&cd->cdi); 517 get_sectorsize(cd); 518 } 519 520 static int sr_block_open(struct block_device *bdev, fmode_t mode) 521 { 522 struct scsi_cd *cd; 523 struct scsi_device *sdev; 524 int ret = -ENXIO; 525 526 cd = scsi_cd_get(bdev->bd_disk); 527 if (!cd) 528 goto out; 529 530 sdev = cd->device; 531 scsi_autopm_get_device(sdev); 532 if (bdev_check_media_change(bdev)) 533 sr_revalidate_disk(cd); 534 535 mutex_lock(&cd->lock); 536 ret = cdrom_open(&cd->cdi, bdev, mode); 537 mutex_unlock(&cd->lock); 538 539 scsi_autopm_put_device(sdev); 540 if (ret) 541 scsi_cd_put(cd); 542 543 out: 544 return ret; 545 } 546 547 static void sr_block_release(struct gendisk *disk, fmode_t mode) 548 { 549 struct scsi_cd *cd = scsi_cd(disk); 550 551 mutex_lock(&cd->lock); 552 cdrom_release(&cd->cdi, mode); 553 mutex_unlock(&cd->lock); 554 555 scsi_cd_put(cd); 556 } 557 558 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 559 unsigned long arg) 560 { 561 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 562 struct scsi_device *sdev = cd->device; 563 void __user *argp = (void __user *)arg; 564 int ret; 565 566 mutex_lock(&cd->lock); 567 568 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 569 (mode & FMODE_NDELAY) != 0); 570 if (ret) 571 goto out; 572 573 scsi_autopm_get_device(sdev); 574 575 /* 576 * Send SCSI addressing ioctls directly to mid level, send other 577 * ioctls to cdrom/block level. 578 */ 579 switch (cmd) { 580 case SCSI_IOCTL_GET_IDLUN: 581 case SCSI_IOCTL_GET_BUS_NUMBER: 582 ret = scsi_ioctl(sdev, cmd, argp); 583 goto put; 584 } 585 586 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 587 if (ret != -ENOSYS) 588 goto put; 589 590 ret = scsi_ioctl(sdev, cmd, argp); 591 592 put: 593 scsi_autopm_put_device(sdev); 594 595 out: 596 mutex_unlock(&cd->lock); 597 return ret; 598 } 599 600 #ifdef CONFIG_COMPAT 601 static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 602 unsigned long arg) 603 { 604 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 605 struct scsi_device *sdev = cd->device; 606 void __user *argp = compat_ptr(arg); 607 int ret; 608 609 mutex_lock(&cd->lock); 610 611 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 612 (mode & FMODE_NDELAY) != 0); 613 if (ret) 614 goto out; 615 616 scsi_autopm_get_device(sdev); 617 618 /* 619 * Send SCSI addressing ioctls directly to mid level, send other 620 * ioctls to cdrom/block level. 621 */ 622 switch (cmd) { 623 case SCSI_IOCTL_GET_IDLUN: 624 case SCSI_IOCTL_GET_BUS_NUMBER: 625 ret = scsi_compat_ioctl(sdev, cmd, argp); 626 goto put; 627 } 628 629 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp); 630 if (ret != -ENOSYS) 631 goto put; 632 633 ret = scsi_compat_ioctl(sdev, cmd, argp); 634 635 put: 636 scsi_autopm_put_device(sdev); 637 638 out: 639 mutex_unlock(&cd->lock); 640 return ret; 641 642 } 643 #endif 644 645 static unsigned int sr_block_check_events(struct gendisk *disk, 646 unsigned int clearing) 647 { 648 unsigned int ret = 0; 649 struct scsi_cd *cd; 650 651 cd = scsi_cd_get(disk); 652 if (!cd) 653 return 0; 654 655 if (!atomic_read(&cd->device->disk_events_disable_depth)) 656 ret = cdrom_check_events(&cd->cdi, clearing); 657 658 scsi_cd_put(cd); 659 return ret; 660 } 661 662 static const struct block_device_operations sr_bdops = 663 { 664 .owner = THIS_MODULE, 665 .open = sr_block_open, 666 .release = sr_block_release, 667 .ioctl = sr_block_ioctl, 668 #ifdef CONFIG_COMPAT 669 .compat_ioctl = sr_block_compat_ioctl, 670 #endif 671 .check_events = sr_block_check_events, 672 }; 673 674 static int sr_open(struct cdrom_device_info *cdi, int purpose) 675 { 676 struct scsi_cd *cd = cdi->handle; 677 struct scsi_device *sdev = cd->device; 678 int retval; 679 680 /* 681 * If the device is in error recovery, wait until it is done. 682 * If the device is offline, then disallow any access to it. 683 */ 684 retval = -ENXIO; 685 if (!scsi_block_when_processing_errors(sdev)) 686 goto error_out; 687 688 return 0; 689 690 error_out: 691 return retval; 692 } 693 694 static void sr_release(struct cdrom_device_info *cdi) 695 { 696 } 697 698 static int sr_probe(struct device *dev) 699 { 700 struct scsi_device *sdev = to_scsi_device(dev); 701 struct gendisk *disk; 702 struct scsi_cd *cd; 703 int minor, error; 704 705 scsi_autopm_get_device(sdev); 706 error = -ENODEV; 707 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 708 goto fail; 709 710 error = -ENOMEM; 711 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 712 if (!cd) 713 goto fail; 714 715 kref_init(&cd->kref); 716 717 disk = __alloc_disk_node(sdev->request_queue, NUMA_NO_NODE, 718 &sr_bio_compl_lkclass); 719 if (!disk) 720 goto fail_free; 721 mutex_init(&cd->lock); 722 723 spin_lock(&sr_index_lock); 724 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 725 if (minor == SR_DISKS) { 726 spin_unlock(&sr_index_lock); 727 error = -EBUSY; 728 goto fail_put; 729 } 730 __set_bit(minor, sr_index_bits); 731 spin_unlock(&sr_index_lock); 732 733 disk->major = SCSI_CDROM_MAJOR; 734 disk->first_minor = minor; 735 disk->minors = 1; 736 sprintf(disk->disk_name, "sr%d", minor); 737 disk->fops = &sr_bdops; 738 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 739 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 740 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; 741 742 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 743 744 cd->device = sdev; 745 cd->disk = disk; 746 cd->driver = &sr_template; 747 cd->disk = disk; 748 cd->capacity = 0x1fffff; 749 cd->device->changed = 1; /* force recheck CD type */ 750 cd->media_present = 1; 751 cd->use = 1; 752 cd->readcd_known = 0; 753 cd->readcd_cdda = 0; 754 755 cd->cdi.ops = &sr_dops; 756 cd->cdi.handle = cd; 757 cd->cdi.mask = 0; 758 cd->cdi.capacity = 1; 759 sprintf(cd->cdi.name, "sr%d", minor); 760 761 sdev->sector_size = 2048; /* A guess, just in case */ 762 763 /* FIXME: need to handle a get_capabilities failure properly ?? */ 764 get_capabilities(cd); 765 sr_vendor_init(cd); 766 767 set_capacity(disk, cd->capacity); 768 disk->private_data = &cd->driver; 769 770 if (register_cdrom(disk, &cd->cdi)) 771 goto fail_minor; 772 773 /* 774 * Initialize block layer runtime PM stuffs before the 775 * periodic event checking request gets started in add_disk. 776 */ 777 blk_pm_runtime_init(sdev->request_queue, dev); 778 779 dev_set_drvdata(dev, cd); 780 disk->flags |= GENHD_FL_REMOVABLE; 781 sr_revalidate_disk(cd); 782 device_add_disk(&sdev->sdev_gendev, disk, NULL); 783 784 sdev_printk(KERN_DEBUG, sdev, 785 "Attached scsi CD-ROM %s\n", cd->cdi.name); 786 scsi_autopm_put_device(cd->device); 787 788 return 0; 789 790 fail_minor: 791 spin_lock(&sr_index_lock); 792 clear_bit(minor, sr_index_bits); 793 spin_unlock(&sr_index_lock); 794 fail_put: 795 put_disk(disk); 796 mutex_destroy(&cd->lock); 797 fail_free: 798 kfree(cd); 799 fail: 800 scsi_autopm_put_device(sdev); 801 return error; 802 } 803 804 805 static void get_sectorsize(struct scsi_cd *cd) 806 { 807 unsigned char cmd[10]; 808 unsigned char buffer[8]; 809 int the_result, retries = 3; 810 int sector_size; 811 struct request_queue *queue; 812 813 do { 814 cmd[0] = READ_CAPACITY; 815 memset((void *) &cmd[1], 0, 9); 816 memset(buffer, 0, sizeof(buffer)); 817 818 /* Do the command and wait.. */ 819 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 820 buffer, sizeof(buffer), NULL, 821 SR_TIMEOUT, MAX_RETRIES, NULL); 822 823 retries--; 824 825 } while (the_result && retries); 826 827 828 if (the_result) { 829 cd->capacity = 0x1fffff; 830 sector_size = 2048; /* A guess, just in case */ 831 } else { 832 long last_written; 833 834 cd->capacity = 1 + get_unaligned_be32(&buffer[0]); 835 /* 836 * READ_CAPACITY doesn't return the correct size on 837 * certain UDF media. If last_written is larger, use 838 * it instead. 839 * 840 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 841 */ 842 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 843 cd->capacity = max_t(long, cd->capacity, last_written); 844 845 sector_size = get_unaligned_be32(&buffer[4]); 846 switch (sector_size) { 847 /* 848 * HP 4020i CD-Recorder reports 2340 byte sectors 849 * Philips CD-Writers report 2352 byte sectors 850 * 851 * Use 2k sectors for them.. 852 */ 853 case 0: 854 case 2340: 855 case 2352: 856 sector_size = 2048; 857 fallthrough; 858 case 2048: 859 cd->capacity *= 4; 860 fallthrough; 861 case 512: 862 break; 863 default: 864 sr_printk(KERN_INFO, cd, 865 "unsupported sector size %d.", sector_size); 866 cd->capacity = 0; 867 } 868 869 cd->device->sector_size = sector_size; 870 871 /* 872 * Add this so that we have the ability to correctly gauge 873 * what the device is capable of. 874 */ 875 set_capacity(cd->disk, cd->capacity); 876 } 877 878 queue = cd->device->request_queue; 879 blk_queue_logical_block_size(queue, sector_size); 880 881 return; 882 } 883 884 static void get_capabilities(struct scsi_cd *cd) 885 { 886 unsigned char *buffer; 887 struct scsi_mode_data data; 888 struct scsi_sense_hdr sshdr; 889 unsigned int ms_len = 128; 890 int rc, n; 891 892 static const char *loadmech[] = 893 { 894 "caddy", 895 "tray", 896 "pop-up", 897 "", 898 "changer", 899 "cartridge changer", 900 "", 901 "" 902 }; 903 904 905 /* allocate transfer buffer */ 906 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 907 if (!buffer) { 908 sr_printk(KERN_ERR, cd, "out of memory.\n"); 909 return; 910 } 911 912 /* eat unit attentions */ 913 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 914 915 /* ask for mode page 0x2a */ 916 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 917 SR_TIMEOUT, 3, &data, NULL); 918 919 if (rc < 0 || data.length > ms_len || 920 data.header_length + data.block_descriptor_length > data.length) { 921 /* failed, drive doesn't have capabilities mode page */ 922 cd->cdi.speed = 1; 923 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 924 CDC_DVD | CDC_DVD_RAM | 925 CDC_SELECT_DISC | CDC_SELECT_SPEED | 926 CDC_MRW | CDC_MRW_W | CDC_RAM); 927 kfree(buffer); 928 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 929 return; 930 } 931 932 n = data.header_length + data.block_descriptor_length; 933 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; 934 cd->readcd_known = 1; 935 cd->readcd_cdda = buffer[n + 5] & 0x01; 936 /* print some capability bits */ 937 sr_printk(KERN_INFO, cd, 938 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 939 get_unaligned_be16(&buffer[n + 14]) / 176, 940 cd->cdi.speed, 941 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 942 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 943 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 944 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 945 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 946 loadmech[buffer[n + 6] >> 5]); 947 if ((buffer[n + 6] >> 5) == 0) 948 /* caddy drives can't close tray... */ 949 cd->cdi.mask |= CDC_CLOSE_TRAY; 950 if ((buffer[n + 2] & 0x8) == 0) 951 /* not a DVD drive */ 952 cd->cdi.mask |= CDC_DVD; 953 if ((buffer[n + 3] & 0x20) == 0) 954 /* can't write DVD-RAM media */ 955 cd->cdi.mask |= CDC_DVD_RAM; 956 if ((buffer[n + 3] & 0x10) == 0) 957 /* can't write DVD-R media */ 958 cd->cdi.mask |= CDC_DVD_R; 959 if ((buffer[n + 3] & 0x2) == 0) 960 /* can't write CD-RW media */ 961 cd->cdi.mask |= CDC_CD_RW; 962 if ((buffer[n + 3] & 0x1) == 0) 963 /* can't write CD-R media */ 964 cd->cdi.mask |= CDC_CD_R; 965 if ((buffer[n + 6] & 0x8) == 0) 966 /* can't eject */ 967 cd->cdi.mask |= CDC_OPEN_TRAY; 968 969 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 970 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 971 cd->cdi.capacity = 972 cdrom_number_of_slots(&cd->cdi); 973 if (cd->cdi.capacity <= 1) 974 /* not a changer */ 975 cd->cdi.mask |= CDC_SELECT_DISC; 976 /*else I don't think it can close its tray 977 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 978 979 /* 980 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 981 */ 982 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 983 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 984 cd->writeable = 1; 985 } 986 987 kfree(buffer); 988 } 989 990 /* 991 * sr_packet() is the entry point for the generic commands generated 992 * by the Uniform CD-ROM layer. 993 */ 994 static int sr_packet(struct cdrom_device_info *cdi, 995 struct packet_command *cgc) 996 { 997 struct scsi_cd *cd = cdi->handle; 998 struct scsi_device *sdev = cd->device; 999 1000 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 1001 return -EDRIVE_CANT_DO_THIS; 1002 1003 if (cgc->timeout <= 0) 1004 cgc->timeout = IOCTL_TIMEOUT; 1005 1006 sr_do_ioctl(cd, cgc); 1007 1008 return cgc->stat; 1009 } 1010 1011 /** 1012 * sr_kref_release - Called to free the scsi_cd structure 1013 * @kref: pointer to embedded kref 1014 * 1015 * sr_ref_mutex must be held entering this routine. Because it is 1016 * called on last put, you should always use the scsi_cd_get() 1017 * scsi_cd_put() helpers which manipulate the semaphore directly 1018 * and never do a direct kref_put(). 1019 **/ 1020 static void sr_kref_release(struct kref *kref) 1021 { 1022 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 1023 struct gendisk *disk = cd->disk; 1024 1025 spin_lock(&sr_index_lock); 1026 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 1027 spin_unlock(&sr_index_lock); 1028 1029 unregister_cdrom(&cd->cdi); 1030 1031 disk->private_data = NULL; 1032 1033 put_disk(disk); 1034 1035 mutex_destroy(&cd->lock); 1036 1037 kfree(cd); 1038 } 1039 1040 static int sr_remove(struct device *dev) 1041 { 1042 struct scsi_cd *cd = dev_get_drvdata(dev); 1043 1044 scsi_autopm_get_device(cd->device); 1045 1046 del_gendisk(cd->disk); 1047 dev_set_drvdata(dev, NULL); 1048 1049 mutex_lock(&sr_ref_mutex); 1050 kref_put(&cd->kref, sr_kref_release); 1051 mutex_unlock(&sr_ref_mutex); 1052 1053 return 0; 1054 } 1055 1056 static int __init init_sr(void) 1057 { 1058 int rc; 1059 1060 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1061 if (rc) 1062 return rc; 1063 rc = scsi_register_driver(&sr_template.gendrv); 1064 if (rc) 1065 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1066 1067 return rc; 1068 } 1069 1070 static void __exit exit_sr(void) 1071 { 1072 scsi_unregister_driver(&sr_template.gendrv); 1073 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1074 } 1075 1076 module_init(init_sr); 1077 module_exit(exit_sr); 1078 MODULE_LICENSE("GPL"); 1079