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 69MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 70MODULE_LICENSE("GPL"); 71MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 72MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 73MODULE_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 84static int sr_probe(struct device *); 85static int sr_remove(struct device *); 86static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); 87static int sr_done(struct scsi_cmnd *); 88static int sr_runtime_suspend(struct device *dev); 89 90static const struct dev_pm_ops sr_pm_ops = { 91 .runtime_suspend = sr_runtime_suspend, 92}; 93 94static 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 106static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 107static 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) */ 112static DEFINE_MUTEX(sr_ref_mutex); 113 114static int sr_open(struct cdrom_device_info *, int); 115static void sr_release(struct cdrom_device_info *); 116 117static void get_sectorsize(struct scsi_cd *); 118static void get_capabilities(struct scsi_cd *); 119 120static unsigned int sr_check_events(struct cdrom_device_info *cdi, 121 unsigned int clearing, int slot); 122static int sr_packet(struct cdrom_device_info *, struct packet_command *); 123 124static 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 140static void sr_kref_release(struct kref *kref); 141 142static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 143{ 144 return container_of(disk->private_data, struct scsi_cd, driver); 145} 146 147static 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 */ 164static 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 182static 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 192static 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 */ 235static 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; 275do_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 */ 324static 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 (driver_byte(result) != 0 && /* An error occurred */ 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 390static 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 /* 422 * we do lazy blocksize switching (when reading XA sectors, 423 * see CDROMREADMODE2 ioctl) 424 */ 425 s_size = cd->device->sector_size; 426 if (s_size > 2048) { 427 if (!in_interrupt()) 428 sr_set_blocklength(cd, 2048); 429 else 430 scmd_printk(KERN_INFO, SCpnt, 431 "can't switch blocksize: in interrupt\n"); 432 } 433 434 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 435 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 436 goto out; 437 } 438 439 switch (req_op(rq)) { 440 case REQ_OP_WRITE: 441 if (!cd->writeable) 442 goto out; 443 SCpnt->cmnd[0] = WRITE_10; 444 cd->cdi.media_written = 1; 445 break; 446 case REQ_OP_READ: 447 SCpnt->cmnd[0] = READ_10; 448 break; 449 default: 450 blk_dump_rq_flags(rq, "Unknown sr command"); 451 goto out; 452 } 453 454 { 455 struct scatterlist *sg; 456 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 457 458 scsi_for_each_sg(SCpnt, sg, sg_count, i) 459 size += sg->length; 460 461 if (size != scsi_bufflen(SCpnt)) { 462 scmd_printk(KERN_ERR, SCpnt, 463 "mismatch count %d, bytes %d\n", 464 size, scsi_bufflen(SCpnt)); 465 if (scsi_bufflen(SCpnt) > size) 466 SCpnt->sdb.length = size; 467 } 468 } 469 470 /* 471 * request doesn't start on hw block boundary, add scatter pads 472 */ 473 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 474 (scsi_bufflen(SCpnt) % s_size)) { 475 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 476 goto out; 477 } 478 479 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 480 481 482 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 483 "%s %d/%u 512 byte blocks.\n", 484 (rq_data_dir(rq) == WRITE) ? 485 "writing" : "reading", 486 this_count, blk_rq_sectors(rq))); 487 488 SCpnt->cmnd[1] = 0; 489 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 490 491 if (this_count > 0xffff) { 492 this_count = 0xffff; 493 SCpnt->sdb.length = this_count * s_size; 494 } 495 496 put_unaligned_be32(block, &SCpnt->cmnd[2]); 497 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 498 put_unaligned_be16(this_count, &SCpnt->cmnd[7]); 499 500 /* 501 * We shouldn't disconnect in the middle of a sector, so with a dumb 502 * host adapter, it's safe to assume that we can at least transfer 503 * this many bytes between each connect / disconnect. 504 */ 505 SCpnt->transfersize = cd->device->sector_size; 506 SCpnt->underflow = this_count << 9; 507 SCpnt->allowed = MAX_RETRIES; 508 SCpnt->cmd_len = 10; 509 510 /* 511 * This indicates that the command is ready from our end to be queued. 512 */ 513 return BLK_STS_OK; 514 out: 515 scsi_free_sgtables(SCpnt); 516 return BLK_STS_IOERR; 517} 518 519static void sr_revalidate_disk(struct scsi_cd *cd) 520{ 521 struct scsi_sense_hdr sshdr; 522 523 /* if the unit is not ready, nothing more to do */ 524 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 525 return; 526 sr_cd_check(&cd->cdi); 527 get_sectorsize(cd); 528} 529 530static int sr_block_open(struct block_device *bdev, fmode_t mode) 531{ 532 struct scsi_cd *cd; 533 struct scsi_device *sdev; 534 int ret = -ENXIO; 535 536 cd = scsi_cd_get(bdev->bd_disk); 537 if (!cd) 538 goto out; 539 540 sdev = cd->device; 541 scsi_autopm_get_device(sdev); 542 if (bdev_check_media_change(bdev)) 543 sr_revalidate_disk(cd); 544 545 mutex_lock(&cd->lock); 546 ret = cdrom_open(&cd->cdi, bdev, mode); 547 mutex_unlock(&cd->lock); 548 549 scsi_autopm_put_device(sdev); 550 if (ret) 551 scsi_cd_put(cd); 552 553out: 554 return ret; 555} 556 557static void sr_block_release(struct gendisk *disk, fmode_t mode) 558{ 559 struct scsi_cd *cd = scsi_cd(disk); 560 561 mutex_lock(&cd->lock); 562 cdrom_release(&cd->cdi, mode); 563 mutex_unlock(&cd->lock); 564 565 scsi_cd_put(cd); 566} 567 568static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 569 unsigned long arg) 570{ 571 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 572 struct scsi_device *sdev = cd->device; 573 void __user *argp = (void __user *)arg; 574 int ret; 575 576 mutex_lock(&cd->lock); 577 578 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 579 (mode & FMODE_NDELAY) != 0); 580 if (ret) 581 goto out; 582 583 scsi_autopm_get_device(sdev); 584 585 /* 586 * Send SCSI addressing ioctls directly to mid level, send other 587 * ioctls to cdrom/block level. 588 */ 589 switch (cmd) { 590 case SCSI_IOCTL_GET_IDLUN: 591 case SCSI_IOCTL_GET_BUS_NUMBER: 592 ret = scsi_ioctl(sdev, cmd, argp); 593 goto put; 594 } 595 596 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 597 if (ret != -ENOSYS) 598 goto put; 599 600 ret = scsi_ioctl(sdev, cmd, argp); 601 602put: 603 scsi_autopm_put_device(sdev); 604 605out: 606 mutex_unlock(&cd->lock); 607 return ret; 608} 609 610#ifdef CONFIG_COMPAT 611static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 612 unsigned long arg) 613{ 614 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 615 struct scsi_device *sdev = cd->device; 616 void __user *argp = compat_ptr(arg); 617 int ret; 618 619 mutex_lock(&cd->lock); 620 621 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 622 (mode & FMODE_NDELAY) != 0); 623 if (ret) 624 goto out; 625 626 scsi_autopm_get_device(sdev); 627 628 /* 629 * Send SCSI addressing ioctls directly to mid level, send other 630 * ioctls to cdrom/block level. 631 */ 632 switch (cmd) { 633 case SCSI_IOCTL_GET_IDLUN: 634 case SCSI_IOCTL_GET_BUS_NUMBER: 635 ret = scsi_compat_ioctl(sdev, cmd, argp); 636 goto put; 637 } 638 639 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp); 640 if (ret != -ENOSYS) 641 goto put; 642 643 ret = scsi_compat_ioctl(sdev, cmd, argp); 644 645put: 646 scsi_autopm_put_device(sdev); 647 648out: 649 mutex_unlock(&cd->lock); 650 return ret; 651 652} 653#endif 654 655static unsigned int sr_block_check_events(struct gendisk *disk, 656 unsigned int clearing) 657{ 658 unsigned int ret = 0; 659 struct scsi_cd *cd; 660 661 cd = scsi_cd_get(disk); 662 if (!cd) 663 return 0; 664 665 if (!atomic_read(&cd->device->disk_events_disable_depth)) 666 ret = cdrom_check_events(&cd->cdi, clearing); 667 668 scsi_cd_put(cd); 669 return ret; 670} 671 672static const struct block_device_operations sr_bdops = 673{ 674 .owner = THIS_MODULE, 675 .open = sr_block_open, 676 .release = sr_block_release, 677 .ioctl = sr_block_ioctl, 678#ifdef CONFIG_COMPAT 679 .compat_ioctl = sr_block_compat_ioctl, 680#endif 681 .check_events = sr_block_check_events, 682}; 683 684static int sr_open(struct cdrom_device_info *cdi, int purpose) 685{ 686 struct scsi_cd *cd = cdi->handle; 687 struct scsi_device *sdev = cd->device; 688 int retval; 689 690 /* 691 * If the device is in error recovery, wait until it is done. 692 * If the device is offline, then disallow any access to it. 693 */ 694 retval = -ENXIO; 695 if (!scsi_block_when_processing_errors(sdev)) 696 goto error_out; 697 698 return 0; 699 700error_out: 701 return retval; 702} 703 704static void sr_release(struct cdrom_device_info *cdi) 705{ 706 struct scsi_cd *cd = cdi->handle; 707 708 if (cd->device->sector_size > 2048) 709 sr_set_blocklength(cd, 2048); 710 711} 712 713static int sr_probe(struct device *dev) 714{ 715 struct scsi_device *sdev = to_scsi_device(dev); 716 struct gendisk *disk; 717 struct scsi_cd *cd; 718 int minor, error; 719 720 scsi_autopm_get_device(sdev); 721 error = -ENODEV; 722 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 723 goto fail; 724 725 error = -ENOMEM; 726 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 727 if (!cd) 728 goto fail; 729 730 kref_init(&cd->kref); 731 732 disk = alloc_disk(1); 733 if (!disk) 734 goto fail_free; 735 mutex_init(&cd->lock); 736 737 spin_lock(&sr_index_lock); 738 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 739 if (minor == SR_DISKS) { 740 spin_unlock(&sr_index_lock); 741 error = -EBUSY; 742 goto fail_put; 743 } 744 __set_bit(minor, sr_index_bits); 745 spin_unlock(&sr_index_lock); 746 747 disk->major = SCSI_CDROM_MAJOR; 748 disk->first_minor = minor; 749 sprintf(disk->disk_name, "sr%d", minor); 750 disk->fops = &sr_bdops; 751 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 752 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 753 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; 754 755 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 756 757 cd->device = sdev; 758 cd->disk = disk; 759 cd->driver = &sr_template; 760 cd->disk = disk; 761 cd->capacity = 0x1fffff; 762 cd->device->changed = 1; /* force recheck CD type */ 763 cd->media_present = 1; 764 cd->use = 1; 765 cd->readcd_known = 0; 766 cd->readcd_cdda = 0; 767 768 cd->cdi.ops = &sr_dops; 769 cd->cdi.handle = cd; 770 cd->cdi.mask = 0; 771 cd->cdi.capacity = 1; 772 sprintf(cd->cdi.name, "sr%d", minor); 773 774 sdev->sector_size = 2048; /* A guess, just in case */ 775 776 /* FIXME: need to handle a get_capabilities failure properly ?? */ 777 get_capabilities(cd); 778 sr_vendor_init(cd); 779 780 set_capacity(disk, cd->capacity); 781 disk->private_data = &cd->driver; 782 disk->queue = sdev->request_queue; 783 784 if (register_cdrom(disk, &cd->cdi)) 785 goto fail_minor; 786 787 /* 788 * Initialize block layer runtime PM stuffs before the 789 * periodic event checking request gets started in add_disk. 790 */ 791 blk_pm_runtime_init(sdev->request_queue, dev); 792 793 dev_set_drvdata(dev, cd); 794 disk->flags |= GENHD_FL_REMOVABLE; 795 sr_revalidate_disk(cd); 796 device_add_disk(&sdev->sdev_gendev, disk, NULL); 797 798 sdev_printk(KERN_DEBUG, sdev, 799 "Attached scsi CD-ROM %s\n", cd->cdi.name); 800 scsi_autopm_put_device(cd->device); 801 802 return 0; 803 804fail_minor: 805 spin_lock(&sr_index_lock); 806 clear_bit(minor, sr_index_bits); 807 spin_unlock(&sr_index_lock); 808fail_put: 809 put_disk(disk); 810 mutex_destroy(&cd->lock); 811fail_free: 812 kfree(cd); 813fail: 814 scsi_autopm_put_device(sdev); 815 return error; 816} 817 818 819static void get_sectorsize(struct scsi_cd *cd) 820{ 821 unsigned char cmd[10]; 822 unsigned char buffer[8]; 823 int the_result, retries = 3; 824 int sector_size; 825 struct request_queue *queue; 826 827 do { 828 cmd[0] = READ_CAPACITY; 829 memset((void *) &cmd[1], 0, 9); 830 memset(buffer, 0, sizeof(buffer)); 831 832 /* Do the command and wait.. */ 833 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 834 buffer, sizeof(buffer), NULL, 835 SR_TIMEOUT, MAX_RETRIES, NULL); 836 837 retries--; 838 839 } while (the_result && retries); 840 841 842 if (the_result) { 843 cd->capacity = 0x1fffff; 844 sector_size = 2048; /* A guess, just in case */ 845 } else { 846 long last_written; 847 848 cd->capacity = 1 + get_unaligned_be32(&buffer[0]); 849 /* 850 * READ_CAPACITY doesn't return the correct size on 851 * certain UDF media. If last_written is larger, use 852 * it instead. 853 * 854 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 855 */ 856 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 857 cd->capacity = max_t(long, cd->capacity, last_written); 858 859 sector_size = get_unaligned_be32(&buffer[4]); 860 switch (sector_size) { 861 /* 862 * HP 4020i CD-Recorder reports 2340 byte sectors 863 * Philips CD-Writers report 2352 byte sectors 864 * 865 * Use 2k sectors for them.. 866 */ 867 case 0: 868 case 2340: 869 case 2352: 870 sector_size = 2048; 871 fallthrough; 872 case 2048: 873 cd->capacity *= 4; 874 fallthrough; 875 case 512: 876 break; 877 default: 878 sr_printk(KERN_INFO, cd, 879 "unsupported sector size %d.", sector_size); 880 cd->capacity = 0; 881 } 882 883 cd->device->sector_size = sector_size; 884 885 /* 886 * Add this so that we have the ability to correctly gauge 887 * what the device is capable of. 888 */ 889 set_capacity(cd->disk, cd->capacity); 890 } 891 892 queue = cd->device->request_queue; 893 blk_queue_logical_block_size(queue, sector_size); 894 895 return; 896} 897 898static void get_capabilities(struct scsi_cd *cd) 899{ 900 unsigned char *buffer; 901 struct scsi_mode_data data; 902 struct scsi_sense_hdr sshdr; 903 unsigned int ms_len = 128; 904 int rc, n; 905 906 static const char *loadmech[] = 907 { 908 "caddy", 909 "tray", 910 "pop-up", 911 "", 912 "changer", 913 "cartridge changer", 914 "", 915 "" 916 }; 917 918 919 /* allocate transfer buffer */ 920 buffer = kmalloc(512, GFP_KERNEL); 921 if (!buffer) { 922 sr_printk(KERN_ERR, cd, "out of memory.\n"); 923 return; 924 } 925 926 /* eat unit attentions */ 927 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 928 929 /* ask for mode page 0x2a */ 930 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 931 SR_TIMEOUT, 3, &data, NULL); 932 933 if (rc < 0 || data.length > ms_len || 934 data.header_length + data.block_descriptor_length > data.length) { 935 /* failed, drive doesn't have capabilities mode page */ 936 cd->cdi.speed = 1; 937 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 938 CDC_DVD | CDC_DVD_RAM | 939 CDC_SELECT_DISC | CDC_SELECT_SPEED | 940 CDC_MRW | CDC_MRW_W | CDC_RAM); 941 kfree(buffer); 942 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 943 return; 944 } 945 946 n = data.header_length + data.block_descriptor_length; 947 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; 948 cd->readcd_known = 1; 949 cd->readcd_cdda = buffer[n + 5] & 0x01; 950 /* print some capability bits */ 951 sr_printk(KERN_INFO, cd, 952 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 953 get_unaligned_be16(&buffer[n + 14]) / 176, 954 cd->cdi.speed, 955 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 956 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 957 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 958 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 959 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 960 loadmech[buffer[n + 6] >> 5]); 961 if ((buffer[n + 6] >> 5) == 0) 962 /* caddy drives can't close tray... */ 963 cd->cdi.mask |= CDC_CLOSE_TRAY; 964 if ((buffer[n + 2] & 0x8) == 0) 965 /* not a DVD drive */ 966 cd->cdi.mask |= CDC_DVD; 967 if ((buffer[n + 3] & 0x20) == 0) 968 /* can't write DVD-RAM media */ 969 cd->cdi.mask |= CDC_DVD_RAM; 970 if ((buffer[n + 3] & 0x10) == 0) 971 /* can't write DVD-R media */ 972 cd->cdi.mask |= CDC_DVD_R; 973 if ((buffer[n + 3] & 0x2) == 0) 974 /* can't write CD-RW media */ 975 cd->cdi.mask |= CDC_CD_RW; 976 if ((buffer[n + 3] & 0x1) == 0) 977 /* can't write CD-R media */ 978 cd->cdi.mask |= CDC_CD_R; 979 if ((buffer[n + 6] & 0x8) == 0) 980 /* can't eject */ 981 cd->cdi.mask |= CDC_OPEN_TRAY; 982 983 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 984 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 985 cd->cdi.capacity = 986 cdrom_number_of_slots(&cd->cdi); 987 if (cd->cdi.capacity <= 1) 988 /* not a changer */ 989 cd->cdi.mask |= CDC_SELECT_DISC; 990 /*else I don't think it can close its tray 991 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 992 993 /* 994 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 995 */ 996 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 997 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 998 cd->writeable = 1; 999 } 1000 1001 kfree(buffer); 1002} 1003 1004/* 1005 * sr_packet() is the entry point for the generic commands generated 1006 * by the Uniform CD-ROM layer. 1007 */ 1008static int sr_packet(struct cdrom_device_info *cdi, 1009 struct packet_command *cgc) 1010{ 1011 struct scsi_cd *cd = cdi->handle; 1012 struct scsi_device *sdev = cd->device; 1013 1014 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 1015 return -EDRIVE_CANT_DO_THIS; 1016 1017 if (cgc->timeout <= 0) 1018 cgc->timeout = IOCTL_TIMEOUT; 1019 1020 sr_do_ioctl(cd, cgc); 1021 1022 return cgc->stat; 1023} 1024 1025/** 1026 * sr_kref_release - Called to free the scsi_cd structure 1027 * @kref: pointer to embedded kref 1028 * 1029 * sr_ref_mutex must be held entering this routine. Because it is 1030 * called on last put, you should always use the scsi_cd_get() 1031 * scsi_cd_put() helpers which manipulate the semaphore directly 1032 * and never do a direct kref_put(). 1033 **/ 1034static void sr_kref_release(struct kref *kref) 1035{ 1036 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 1037 struct gendisk *disk = cd->disk; 1038 1039 spin_lock(&sr_index_lock); 1040 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 1041 spin_unlock(&sr_index_lock); 1042 1043 unregister_cdrom(&cd->cdi); 1044 1045 disk->private_data = NULL; 1046 1047 put_disk(disk); 1048 1049 mutex_destroy(&cd->lock); 1050 1051 kfree(cd); 1052} 1053 1054static int sr_remove(struct device *dev) 1055{ 1056 struct scsi_cd *cd = dev_get_drvdata(dev); 1057 1058 scsi_autopm_get_device(cd->device); 1059 1060 del_gendisk(cd->disk); 1061 dev_set_drvdata(dev, NULL); 1062 1063 mutex_lock(&sr_ref_mutex); 1064 kref_put(&cd->kref, sr_kref_release); 1065 mutex_unlock(&sr_ref_mutex); 1066 1067 return 0; 1068} 1069 1070static int __init init_sr(void) 1071{ 1072 int rc; 1073 1074 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1075 if (rc) 1076 return rc; 1077 rc = scsi_register_driver(&sr_template.gendrv); 1078 if (rc) 1079 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1080 1081 return rc; 1082} 1083 1084static void __exit exit_sr(void) 1085{ 1086 scsi_unregister_driver(&sr_template.gendrv); 1087 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1088} 1089 1090module_init(init_sr); 1091module_exit(exit_sr); 1092MODULE_LICENSE("GPL"); 1093