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 <scsi/scsi.h> 55 #include <scsi/scsi_dbg.h> 56 #include <scsi/scsi_device.h> 57 #include <scsi/scsi_driver.h> 58 #include <scsi/scsi_cmnd.h> 59 #include <scsi/scsi_eh.h> 60 #include <scsi/scsi_host.h> 61 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 62 63 #include "scsi_logging.h" 64 #include "sr.h" 65 66 67 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 68 MODULE_LICENSE("GPL"); 69 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 70 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 71 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 72 73 #define SR_DISKS 256 74 75 #define SR_CAPABILITIES \ 76 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 77 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 78 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 79 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 80 CDC_MRW|CDC_MRW_W|CDC_RAM) 81 82 static DEFINE_MUTEX(sr_mutex); 83 static int sr_probe(struct device *); 84 static int sr_remove(struct device *); 85 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); 86 static int sr_done(struct scsi_cmnd *); 87 static int sr_runtime_suspend(struct device *dev); 88 89 static const struct dev_pm_ops sr_pm_ops = { 90 .runtime_suspend = sr_runtime_suspend, 91 }; 92 93 static struct scsi_driver sr_template = { 94 .gendrv = { 95 .name = "sr", 96 .owner = THIS_MODULE, 97 .probe = sr_probe, 98 .remove = sr_remove, 99 .pm = &sr_pm_ops, 100 }, 101 .init_command = sr_init_command, 102 .done = sr_done, 103 }; 104 105 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 106 static DEFINE_SPINLOCK(sr_index_lock); 107 108 /* This semaphore is used to mediate the 0->1 reference get in the 109 * face of object destruction (i.e. we can't allow a get on an 110 * object after last put) */ 111 static DEFINE_MUTEX(sr_ref_mutex); 112 113 static int sr_open(struct cdrom_device_info *, int); 114 static void sr_release(struct cdrom_device_info *); 115 116 static void get_sectorsize(struct scsi_cd *); 117 static void get_capabilities(struct scsi_cd *); 118 119 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 120 unsigned int clearing, int slot); 121 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 122 123 static const struct cdrom_device_ops sr_dops = { 124 .open = sr_open, 125 .release = sr_release, 126 .drive_status = sr_drive_status, 127 .check_events = sr_check_events, 128 .tray_move = sr_tray_move, 129 .lock_door = sr_lock_door, 130 .select_speed = sr_select_speed, 131 .get_last_session = sr_get_last_session, 132 .get_mcn = sr_get_mcn, 133 .reset = sr_reset, 134 .audio_ioctl = sr_audio_ioctl, 135 .capability = SR_CAPABILITIES, 136 .generic_packet = sr_packet, 137 }; 138 139 static void sr_kref_release(struct kref *kref); 140 141 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 142 { 143 return container_of(disk->private_data, struct scsi_cd, driver); 144 } 145 146 static int sr_runtime_suspend(struct device *dev) 147 { 148 struct scsi_cd *cd = dev_get_drvdata(dev); 149 150 if (!cd) /* E.g.: runtime suspend following sr_remove() */ 151 return 0; 152 153 if (cd->media_present) 154 return -EBUSY; 155 else 156 return 0; 157 } 158 159 /* 160 * The get and put routines for the struct scsi_cd. Note this entity 161 * has a scsi_device pointer and owns a reference to this. 162 */ 163 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 164 { 165 struct scsi_cd *cd = NULL; 166 167 mutex_lock(&sr_ref_mutex); 168 if (disk->private_data == NULL) 169 goto out; 170 cd = scsi_cd(disk); 171 kref_get(&cd->kref); 172 if (scsi_device_get(cd->device)) { 173 kref_put(&cd->kref, sr_kref_release); 174 cd = NULL; 175 } 176 out: 177 mutex_unlock(&sr_ref_mutex); 178 return cd; 179 } 180 181 static void scsi_cd_put(struct scsi_cd *cd) 182 { 183 struct scsi_device *sdev = cd->device; 184 185 mutex_lock(&sr_ref_mutex); 186 kref_put(&cd->kref, sr_kref_release); 187 scsi_device_put(sdev); 188 mutex_unlock(&sr_ref_mutex); 189 } 190 191 static unsigned int sr_get_events(struct scsi_device *sdev) 192 { 193 u8 buf[8]; 194 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 195 1, /* polled */ 196 0, 0, /* reserved */ 197 1 << 4, /* notification class: media */ 198 0, 0, /* reserved */ 199 0, sizeof(buf), /* allocation length */ 200 0, /* control */ 201 }; 202 struct event_header *eh = (void *)buf; 203 struct media_event_desc *med = (void *)(buf + 4); 204 struct scsi_sense_hdr sshdr; 205 int result; 206 207 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 208 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 209 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 210 return DISK_EVENT_MEDIA_CHANGE; 211 212 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 213 return 0; 214 215 if (eh->nea || eh->notification_class != 0x4) 216 return 0; 217 218 if (med->media_event_code == 1) 219 return DISK_EVENT_EJECT_REQUEST; 220 else if (med->media_event_code == 2) 221 return DISK_EVENT_MEDIA_CHANGE; 222 return 0; 223 } 224 225 /* 226 * This function checks to see if the media has been changed or eject 227 * button has been pressed. It is possible that we have already 228 * sensed a change, or the drive may have sensed one and not yet 229 * reported it. The past events are accumulated in sdev->changed and 230 * returned together with the current state. 231 */ 232 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 233 unsigned int clearing, int slot) 234 { 235 struct scsi_cd *cd = cdi->handle; 236 bool last_present; 237 struct scsi_sense_hdr sshdr; 238 unsigned int events; 239 int ret; 240 241 /* no changer support */ 242 if (CDSL_CURRENT != slot) 243 return 0; 244 245 events = sr_get_events(cd->device); 246 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 247 248 /* 249 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 250 * for several times in a row. We rely on TUR only for this likely 251 * broken device, to prevent generating incorrect media changed 252 * events for every open(). 253 */ 254 if (cd->ignore_get_event) { 255 events &= ~DISK_EVENT_MEDIA_CHANGE; 256 goto do_tur; 257 } 258 259 /* 260 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 261 * is being cleared. Note that there are devices which hang 262 * if asked to execute TUR repeatedly. 263 */ 264 if (cd->device->changed) { 265 events |= DISK_EVENT_MEDIA_CHANGE; 266 cd->device->changed = 0; 267 cd->tur_changed = true; 268 } 269 270 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 271 return events; 272 do_tur: 273 /* let's see whether the media is there with TUR */ 274 last_present = cd->media_present; 275 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 276 277 /* 278 * Media is considered to be present if TUR succeeds or fails with 279 * sense data indicating something other than media-not-present 280 * (ASC 0x3a). 281 */ 282 cd->media_present = scsi_status_is_good(ret) || 283 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 284 285 if (last_present != cd->media_present) 286 cd->device->changed = 1; 287 288 if (cd->device->changed) { 289 events |= DISK_EVENT_MEDIA_CHANGE; 290 cd->device->changed = 0; 291 cd->tur_changed = true; 292 } 293 294 if (cd->ignore_get_event) 295 return events; 296 297 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 298 if (!cd->tur_changed) { 299 if (cd->get_event_changed) { 300 if (cd->tur_mismatch++ > 8) { 301 sr_printk(KERN_WARNING, cd, 302 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 303 cd->ignore_get_event = true; 304 } 305 } else { 306 cd->tur_mismatch = 0; 307 } 308 } 309 cd->tur_changed = false; 310 cd->get_event_changed = false; 311 312 return events; 313 } 314 315 /* 316 * sr_done is the interrupt routine for the device driver. 317 * 318 * It will be notified on the end of a SCSI read / write, and will take one 319 * of several actions based on success or failure. 320 */ 321 static int sr_done(struct scsi_cmnd *SCpnt) 322 { 323 int result = SCpnt->result; 324 int this_count = scsi_bufflen(SCpnt); 325 int good_bytes = (result == 0 ? this_count : 0); 326 int block_sectors = 0; 327 long error_sector; 328 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 329 330 #ifdef DEBUG 331 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); 332 #endif 333 334 /* 335 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 336 * success. Since this is a relatively rare error condition, no 337 * care is taken to avoid unnecessary additional work such as 338 * memcpy's that could be avoided. 339 */ 340 if (driver_byte(result) != 0 && /* An error occurred */ 341 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 342 switch (SCpnt->sense_buffer[2]) { 343 case MEDIUM_ERROR: 344 case VOLUME_OVERFLOW: 345 case ILLEGAL_REQUEST: 346 if (!(SCpnt->sense_buffer[0] & 0x90)) 347 break; 348 error_sector = (SCpnt->sense_buffer[3] << 24) | 349 (SCpnt->sense_buffer[4] << 16) | 350 (SCpnt->sense_buffer[5] << 8) | 351 SCpnt->sense_buffer[6]; 352 if (SCpnt->request->bio != NULL) 353 block_sectors = 354 bio_sectors(SCpnt->request->bio); 355 if (block_sectors < 4) 356 block_sectors = 4; 357 if (cd->device->sector_size == 2048) 358 error_sector <<= 2; 359 error_sector &= ~(block_sectors - 1); 360 good_bytes = (error_sector - 361 blk_rq_pos(SCpnt->request)) << 9; 362 if (good_bytes < 0 || good_bytes >= this_count) 363 good_bytes = 0; 364 /* 365 * The SCSI specification allows for the value 366 * returned by READ CAPACITY to be up to 75 2K 367 * sectors past the last readable block. 368 * Therefore, if we hit a medium error within the 369 * last 75 2K sectors, we decrease the saved size 370 * value. 371 */ 372 if (error_sector < get_capacity(cd->disk) && 373 cd->capacity - error_sector < 4 * 75) 374 set_capacity(cd->disk, error_sector); 375 break; 376 377 case RECOVERED_ERROR: 378 good_bytes = this_count; 379 break; 380 381 default: 382 break; 383 } 384 } 385 386 return good_bytes; 387 } 388 389 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) 390 { 391 int block = 0, this_count, s_size; 392 struct scsi_cd *cd; 393 struct request *rq = SCpnt->request; 394 blk_status_t ret; 395 396 ret = scsi_init_io(SCpnt); 397 if (ret != BLK_STS_OK) 398 goto out; 399 cd = scsi_cd(rq->rq_disk); 400 401 /* from here on until we're complete, any goto out 402 * is used for a killable error condition */ 403 ret = BLK_STS_IOERR; 404 405 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, 406 "Doing sr request, block = %d\n", block)); 407 408 if (!cd->device || !scsi_device_online(cd->device)) { 409 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 410 "Finishing %u sectors\n", blk_rq_sectors(rq))); 411 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 412 "Retry with 0x%p\n", SCpnt)); 413 goto out; 414 } 415 416 if (cd->device->changed) { 417 /* 418 * quietly refuse to do anything to a changed disc until the 419 * changed bit has been reset 420 */ 421 goto out; 422 } 423 424 /* 425 * we do lazy blocksize switching (when reading XA sectors, 426 * see CDROMREADMODE2 ioctl) 427 */ 428 s_size = cd->device->sector_size; 429 if (s_size > 2048) { 430 if (!in_interrupt()) 431 sr_set_blocklength(cd, 2048); 432 else 433 scmd_printk(KERN_INFO, SCpnt, 434 "can't switch blocksize: in interrupt\n"); 435 } 436 437 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 438 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 439 goto out; 440 } 441 442 switch (req_op(rq)) { 443 case REQ_OP_WRITE: 444 if (!cd->writeable) 445 goto out; 446 SCpnt->cmnd[0] = WRITE_10; 447 cd->cdi.media_written = 1; 448 break; 449 case REQ_OP_READ: 450 SCpnt->cmnd[0] = READ_10; 451 break; 452 default: 453 blk_dump_rq_flags(rq, "Unknown sr command"); 454 goto out; 455 } 456 457 { 458 struct scatterlist *sg; 459 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 460 461 scsi_for_each_sg(SCpnt, sg, sg_count, i) 462 size += sg->length; 463 464 if (size != scsi_bufflen(SCpnt)) { 465 scmd_printk(KERN_ERR, SCpnt, 466 "mismatch count %d, bytes %d\n", 467 size, scsi_bufflen(SCpnt)); 468 if (scsi_bufflen(SCpnt) > size) 469 SCpnt->sdb.length = size; 470 } 471 } 472 473 /* 474 * request doesn't start on hw block boundary, add scatter pads 475 */ 476 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 477 (scsi_bufflen(SCpnt) % s_size)) { 478 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 479 goto out; 480 } 481 482 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 483 484 485 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, 486 "%s %d/%u 512 byte blocks.\n", 487 (rq_data_dir(rq) == WRITE) ? 488 "writing" : "reading", 489 this_count, blk_rq_sectors(rq))); 490 491 SCpnt->cmnd[1] = 0; 492 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 493 494 if (this_count > 0xffff) { 495 this_count = 0xffff; 496 SCpnt->sdb.length = this_count * s_size; 497 } 498 499 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 500 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 501 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 502 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 503 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 504 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 505 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 506 507 /* 508 * We shouldn't disconnect in the middle of a sector, so with a dumb 509 * host adapter, it's safe to assume that we can at least transfer 510 * this many bytes between each connect / disconnect. 511 */ 512 SCpnt->transfersize = cd->device->sector_size; 513 SCpnt->underflow = this_count << 9; 514 SCpnt->allowed = MAX_RETRIES; 515 516 /* 517 * This indicates that the command is ready from our end to be 518 * queued. 519 */ 520 ret = BLK_STS_OK; 521 out: 522 return ret; 523 } 524 525 static int sr_block_open(struct block_device *bdev, fmode_t mode) 526 { 527 struct scsi_cd *cd; 528 struct scsi_device *sdev; 529 int ret = -ENXIO; 530 531 cd = scsi_cd_get(bdev->bd_disk); 532 if (!cd) 533 goto out; 534 535 sdev = cd->device; 536 scsi_autopm_get_device(sdev); 537 check_disk_change(bdev); 538 539 mutex_lock(&sr_mutex); 540 ret = cdrom_open(&cd->cdi, bdev, mode); 541 mutex_unlock(&sr_mutex); 542 543 scsi_autopm_put_device(sdev); 544 if (ret) 545 scsi_cd_put(cd); 546 547 out: 548 return ret; 549 } 550 551 static void sr_block_release(struct gendisk *disk, fmode_t mode) 552 { 553 struct scsi_cd *cd = scsi_cd(disk); 554 mutex_lock(&sr_mutex); 555 cdrom_release(&cd->cdi, mode); 556 scsi_cd_put(cd); 557 mutex_unlock(&sr_mutex); 558 } 559 560 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 561 unsigned long arg) 562 { 563 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 564 struct scsi_device *sdev = cd->device; 565 void __user *argp = (void __user *)arg; 566 int ret; 567 568 mutex_lock(&sr_mutex); 569 570 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 571 (mode & FMODE_NDELAY) != 0); 572 if (ret) 573 goto out; 574 575 scsi_autopm_get_device(sdev); 576 577 /* 578 * Send SCSI addressing ioctls directly to mid level, send other 579 * ioctls to cdrom/block level. 580 */ 581 switch (cmd) { 582 case SCSI_IOCTL_GET_IDLUN: 583 case SCSI_IOCTL_GET_BUS_NUMBER: 584 ret = scsi_ioctl(sdev, cmd, argp); 585 goto put; 586 } 587 588 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 589 if (ret != -ENOSYS) 590 goto put; 591 592 ret = scsi_ioctl(sdev, cmd, argp); 593 594 put: 595 scsi_autopm_put_device(sdev); 596 597 out: 598 mutex_unlock(&sr_mutex); 599 return ret; 600 } 601 602 #ifdef CONFIG_COMPAT 603 static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 604 unsigned long arg) 605 { 606 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 607 struct scsi_device *sdev = cd->device; 608 void __user *argp = compat_ptr(arg); 609 int ret; 610 611 mutex_lock(&sr_mutex); 612 613 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, 614 (mode & FMODE_NDELAY) != 0); 615 if (ret) 616 goto out; 617 618 scsi_autopm_get_device(sdev); 619 620 /* 621 * Send SCSI addressing ioctls directly to mid level, send other 622 * ioctls to cdrom/block level. 623 */ 624 switch (cmd) { 625 case SCSI_IOCTL_GET_IDLUN: 626 case SCSI_IOCTL_GET_BUS_NUMBER: 627 ret = scsi_compat_ioctl(sdev, cmd, argp); 628 goto put; 629 } 630 631 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp); 632 if (ret != -ENOSYS) 633 goto put; 634 635 ret = scsi_compat_ioctl(sdev, cmd, argp); 636 637 put: 638 scsi_autopm_put_device(sdev); 639 640 out: 641 mutex_unlock(&sr_mutex); 642 return ret; 643 644 } 645 #endif 646 647 static unsigned int sr_block_check_events(struct gendisk *disk, 648 unsigned int clearing) 649 { 650 unsigned int ret = 0; 651 struct scsi_cd *cd; 652 653 cd = scsi_cd_get(disk); 654 if (!cd) 655 return 0; 656 657 if (!atomic_read(&cd->device->disk_events_disable_depth)) 658 ret = cdrom_check_events(&cd->cdi, clearing); 659 660 scsi_cd_put(cd); 661 return ret; 662 } 663 664 static int sr_block_revalidate_disk(struct gendisk *disk) 665 { 666 struct scsi_sense_hdr sshdr; 667 struct scsi_cd *cd; 668 669 cd = scsi_cd_get(disk); 670 if (!cd) 671 return -ENXIO; 672 673 /* if the unit is not ready, nothing more to do */ 674 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 675 goto out; 676 677 sr_cd_check(&cd->cdi); 678 get_sectorsize(cd); 679 out: 680 scsi_cd_put(cd); 681 return 0; 682 } 683 684 static const struct block_device_operations sr_bdops = 685 { 686 .owner = THIS_MODULE, 687 .open = sr_block_open, 688 .release = sr_block_release, 689 .ioctl = sr_block_ioctl, 690 #ifdef CONFIG_COMPAT 691 .ioctl = sr_block_compat_ioctl, 692 #endif 693 .check_events = sr_block_check_events, 694 .revalidate_disk = sr_block_revalidate_disk, 695 }; 696 697 static int sr_open(struct cdrom_device_info *cdi, int purpose) 698 { 699 struct scsi_cd *cd = cdi->handle; 700 struct scsi_device *sdev = cd->device; 701 int retval; 702 703 /* 704 * If the device is in error recovery, wait until it is done. 705 * If the device is offline, then disallow any access to it. 706 */ 707 retval = -ENXIO; 708 if (!scsi_block_when_processing_errors(sdev)) 709 goto error_out; 710 711 return 0; 712 713 error_out: 714 return retval; 715 } 716 717 static void sr_release(struct cdrom_device_info *cdi) 718 { 719 struct scsi_cd *cd = cdi->handle; 720 721 if (cd->device->sector_size > 2048) 722 sr_set_blocklength(cd, 2048); 723 724 } 725 726 static int sr_probe(struct device *dev) 727 { 728 struct scsi_device *sdev = to_scsi_device(dev); 729 struct gendisk *disk; 730 struct scsi_cd *cd; 731 int minor, error; 732 733 scsi_autopm_get_device(sdev); 734 error = -ENODEV; 735 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 736 goto fail; 737 738 error = -ENOMEM; 739 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 740 if (!cd) 741 goto fail; 742 743 kref_init(&cd->kref); 744 745 disk = alloc_disk(1); 746 if (!disk) 747 goto fail_free; 748 749 spin_lock(&sr_index_lock); 750 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 751 if (minor == SR_DISKS) { 752 spin_unlock(&sr_index_lock); 753 error = -EBUSY; 754 goto fail_put; 755 } 756 __set_bit(minor, sr_index_bits); 757 spin_unlock(&sr_index_lock); 758 759 disk->major = SCSI_CDROM_MAJOR; 760 disk->first_minor = minor; 761 sprintf(disk->disk_name, "sr%d", minor); 762 disk->fops = &sr_bdops; 763 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 764 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 765 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; 766 767 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 768 769 cd->device = sdev; 770 cd->disk = disk; 771 cd->driver = &sr_template; 772 cd->disk = disk; 773 cd->capacity = 0x1fffff; 774 cd->device->changed = 1; /* force recheck CD type */ 775 cd->media_present = 1; 776 cd->use = 1; 777 cd->readcd_known = 0; 778 cd->readcd_cdda = 0; 779 780 cd->cdi.ops = &sr_dops; 781 cd->cdi.handle = cd; 782 cd->cdi.mask = 0; 783 cd->cdi.capacity = 1; 784 sprintf(cd->cdi.name, "sr%d", minor); 785 786 sdev->sector_size = 2048; /* A guess, just in case */ 787 788 /* FIXME: need to handle a get_capabilities failure properly ?? */ 789 get_capabilities(cd); 790 sr_vendor_init(cd); 791 792 set_capacity(disk, cd->capacity); 793 disk->private_data = &cd->driver; 794 disk->queue = sdev->request_queue; 795 cd->cdi.disk = disk; 796 797 if (register_cdrom(&cd->cdi)) 798 goto fail_put; 799 800 /* 801 * Initialize block layer runtime PM stuffs before the 802 * periodic event checking request gets started in add_disk. 803 */ 804 blk_pm_runtime_init(sdev->request_queue, dev); 805 806 dev_set_drvdata(dev, cd); 807 disk->flags |= GENHD_FL_REMOVABLE; 808 device_add_disk(&sdev->sdev_gendev, disk, NULL); 809 810 sdev_printk(KERN_DEBUG, sdev, 811 "Attached scsi CD-ROM %s\n", cd->cdi.name); 812 scsi_autopm_put_device(cd->device); 813 814 return 0; 815 816 fail_put: 817 put_disk(disk); 818 fail_free: 819 kfree(cd); 820 fail: 821 scsi_autopm_put_device(sdev); 822 return error; 823 } 824 825 826 static void get_sectorsize(struct scsi_cd *cd) 827 { 828 unsigned char cmd[10]; 829 unsigned char buffer[8]; 830 int the_result, retries = 3; 831 int sector_size; 832 struct request_queue *queue; 833 834 do { 835 cmd[0] = READ_CAPACITY; 836 memset((void *) &cmd[1], 0, 9); 837 memset(buffer, 0, sizeof(buffer)); 838 839 /* Do the command and wait.. */ 840 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 841 buffer, sizeof(buffer), NULL, 842 SR_TIMEOUT, MAX_RETRIES, NULL); 843 844 retries--; 845 846 } while (the_result && retries); 847 848 849 if (the_result) { 850 cd->capacity = 0x1fffff; 851 sector_size = 2048; /* A guess, just in case */ 852 } else { 853 long last_written; 854 855 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | 856 (buffer[2] << 8) | buffer[3]); 857 /* 858 * READ_CAPACITY doesn't return the correct size on 859 * certain UDF media. If last_written is larger, use 860 * it instead. 861 * 862 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 863 */ 864 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 865 cd->capacity = max_t(long, cd->capacity, last_written); 866 867 sector_size = (buffer[4] << 24) | 868 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 869 switch (sector_size) { 870 /* 871 * HP 4020i CD-Recorder reports 2340 byte sectors 872 * Philips CD-Writers report 2352 byte sectors 873 * 874 * Use 2k sectors for them.. 875 */ 876 case 0: 877 case 2340: 878 case 2352: 879 sector_size = 2048; 880 /* fall through */ 881 case 2048: 882 cd->capacity *= 4; 883 /* fall through */ 884 case 512: 885 break; 886 default: 887 sr_printk(KERN_INFO, cd, 888 "unsupported sector size %d.", sector_size); 889 cd->capacity = 0; 890 } 891 892 cd->device->sector_size = sector_size; 893 894 /* 895 * Add this so that we have the ability to correctly gauge 896 * what the device is capable of. 897 */ 898 set_capacity(cd->disk, cd->capacity); 899 } 900 901 queue = cd->device->request_queue; 902 blk_queue_logical_block_size(queue, sector_size); 903 904 return; 905 } 906 907 static void get_capabilities(struct scsi_cd *cd) 908 { 909 unsigned char *buffer; 910 struct scsi_mode_data data; 911 struct scsi_sense_hdr sshdr; 912 unsigned int ms_len = 128; 913 int rc, n; 914 915 static const char *loadmech[] = 916 { 917 "caddy", 918 "tray", 919 "pop-up", 920 "", 921 "changer", 922 "cartridge changer", 923 "", 924 "" 925 }; 926 927 928 /* allocate transfer buffer */ 929 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 930 if (!buffer) { 931 sr_printk(KERN_ERR, cd, "out of memory.\n"); 932 return; 933 } 934 935 /* eat unit attentions */ 936 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 937 938 /* ask for mode page 0x2a */ 939 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, 940 SR_TIMEOUT, 3, &data, NULL); 941 942 if (!scsi_status_is_good(rc) || data.length > ms_len || 943 data.header_length + data.block_descriptor_length > data.length) { 944 /* failed, drive doesn't have capabilities mode page */ 945 cd->cdi.speed = 1; 946 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 947 CDC_DVD | CDC_DVD_RAM | 948 CDC_SELECT_DISC | CDC_SELECT_SPEED | 949 CDC_MRW | CDC_MRW_W | CDC_RAM); 950 kfree(buffer); 951 sr_printk(KERN_INFO, cd, "scsi-1 drive"); 952 return; 953 } 954 955 n = data.header_length + data.block_descriptor_length; 956 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 957 cd->readcd_known = 1; 958 cd->readcd_cdda = buffer[n + 5] & 0x01; 959 /* print some capability bits */ 960 sr_printk(KERN_INFO, cd, 961 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", 962 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 963 cd->cdi.speed, 964 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 965 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 966 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 967 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 968 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 969 loadmech[buffer[n + 6] >> 5]); 970 if ((buffer[n + 6] >> 5) == 0) 971 /* caddy drives can't close tray... */ 972 cd->cdi.mask |= CDC_CLOSE_TRAY; 973 if ((buffer[n + 2] & 0x8) == 0) 974 /* not a DVD drive */ 975 cd->cdi.mask |= CDC_DVD; 976 if ((buffer[n + 3] & 0x20) == 0) 977 /* can't write DVD-RAM media */ 978 cd->cdi.mask |= CDC_DVD_RAM; 979 if ((buffer[n + 3] & 0x10) == 0) 980 /* can't write DVD-R media */ 981 cd->cdi.mask |= CDC_DVD_R; 982 if ((buffer[n + 3] & 0x2) == 0) 983 /* can't write CD-RW media */ 984 cd->cdi.mask |= CDC_CD_RW; 985 if ((buffer[n + 3] & 0x1) == 0) 986 /* can't write CD-R media */ 987 cd->cdi.mask |= CDC_CD_R; 988 if ((buffer[n + 6] & 0x8) == 0) 989 /* can't eject */ 990 cd->cdi.mask |= CDC_OPEN_TRAY; 991 992 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 993 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 994 cd->cdi.capacity = 995 cdrom_number_of_slots(&cd->cdi); 996 if (cd->cdi.capacity <= 1) 997 /* not a changer */ 998 cd->cdi.mask |= CDC_SELECT_DISC; 999 /*else I don't think it can close its tray 1000 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 1001 1002 /* 1003 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 1004 */ 1005 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 1006 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 1007 cd->writeable = 1; 1008 } 1009 1010 kfree(buffer); 1011 } 1012 1013 /* 1014 * sr_packet() is the entry point for the generic commands generated 1015 * by the Uniform CD-ROM layer. 1016 */ 1017 static int sr_packet(struct cdrom_device_info *cdi, 1018 struct packet_command *cgc) 1019 { 1020 struct scsi_cd *cd = cdi->handle; 1021 struct scsi_device *sdev = cd->device; 1022 1023 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 1024 return -EDRIVE_CANT_DO_THIS; 1025 1026 if (cgc->timeout <= 0) 1027 cgc->timeout = IOCTL_TIMEOUT; 1028 1029 sr_do_ioctl(cd, cgc); 1030 1031 return cgc->stat; 1032 } 1033 1034 /** 1035 * sr_kref_release - Called to free the scsi_cd structure 1036 * @kref: pointer to embedded kref 1037 * 1038 * sr_ref_mutex must be held entering this routine. Because it is 1039 * called on last put, you should always use the scsi_cd_get() 1040 * scsi_cd_put() helpers which manipulate the semaphore directly 1041 * and never do a direct kref_put(). 1042 **/ 1043 static void sr_kref_release(struct kref *kref) 1044 { 1045 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 1046 struct gendisk *disk = cd->disk; 1047 1048 spin_lock(&sr_index_lock); 1049 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 1050 spin_unlock(&sr_index_lock); 1051 1052 unregister_cdrom(&cd->cdi); 1053 1054 disk->private_data = NULL; 1055 1056 put_disk(disk); 1057 1058 kfree(cd); 1059 } 1060 1061 static int sr_remove(struct device *dev) 1062 { 1063 struct scsi_cd *cd = dev_get_drvdata(dev); 1064 1065 scsi_autopm_get_device(cd->device); 1066 1067 del_gendisk(cd->disk); 1068 dev_set_drvdata(dev, NULL); 1069 1070 mutex_lock(&sr_ref_mutex); 1071 kref_put(&cd->kref, sr_kref_release); 1072 mutex_unlock(&sr_ref_mutex); 1073 1074 return 0; 1075 } 1076 1077 static int __init init_sr(void) 1078 { 1079 int rc; 1080 1081 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1082 if (rc) 1083 return rc; 1084 rc = scsi_register_driver(&sr_template.gendrv); 1085 if (rc) 1086 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1087 1088 return rc; 1089 } 1090 1091 static void __exit exit_sr(void) 1092 { 1093 scsi_unregister_driver(&sr_template.gendrv); 1094 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1095 } 1096 1097 module_init(init_sr); 1098 module_exit(exit_sr); 1099 MODULE_LICENSE("GPL"); 1100