1 /* 2 * sr.c Copyright (C) 1992 David Giller 3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 4 * 5 * adapted from: 6 * sd.c Copyright (C) 1992 Drew Eckhardt 7 * Linux scsi disk driver by 8 * Drew Eckhardt <drew@colorado.edu> 9 * 10 * Modified by Eric Youngdale ericy@andante.org to 11 * add scatter-gather, multiple outstanding request, and other 12 * enhancements. 13 * 14 * Modified by Eric Youngdale eric@andante.org to support loadable 15 * low-level scsi drivers. 16 * 17 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to 18 * provide auto-eject. 19 * 20 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the 21 * generic cdrom interface 22 * 23 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() 24 * interface, capabilities probe additions, ioctl cleanups, etc. 25 * 26 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs 27 * 28 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM 29 * transparently and lose the GHOST hack 30 * 31 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> 32 * check resource allocation in sr_init and some cleanups 33 */ 34 35 #include <linux/module.h> 36 #include <linux/fs.h> 37 #include <linux/kernel.h> 38 #include <linux/mm.h> 39 #include <linux/bio.h> 40 #include <linux/string.h> 41 #include <linux/errno.h> 42 #include <linux/cdrom.h> 43 #include <linux/interrupt.h> 44 #include <linux/init.h> 45 #include <linux/blkdev.h> 46 #include <linux/mutex.h> 47 #include <linux/slab.h> 48 #include <asm/uaccess.h> 49 50 #include <scsi/scsi.h> 51 #include <scsi/scsi_dbg.h> 52 #include <scsi/scsi_device.h> 53 #include <scsi/scsi_driver.h> 54 #include <scsi/scsi_cmnd.h> 55 #include <scsi/scsi_eh.h> 56 #include <scsi/scsi_host.h> 57 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 58 59 #include "scsi_logging.h" 60 #include "sr.h" 61 62 63 MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 64 MODULE_LICENSE("GPL"); 65 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 66 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 67 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 68 69 #define SR_DISKS 256 70 71 #define SR_CAPABILITIES \ 72 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 73 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 74 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 75 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 76 CDC_MRW|CDC_MRW_W|CDC_RAM) 77 78 static DEFINE_MUTEX(sr_mutex); 79 static int sr_probe(struct device *); 80 static int sr_remove(struct device *); 81 static int sr_done(struct scsi_cmnd *); 82 83 static struct scsi_driver sr_template = { 84 .owner = THIS_MODULE, 85 .gendrv = { 86 .name = "sr", 87 .probe = sr_probe, 88 .remove = sr_remove, 89 }, 90 .done = sr_done, 91 }; 92 93 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 94 static DEFINE_SPINLOCK(sr_index_lock); 95 96 /* This semaphore is used to mediate the 0->1 reference get in the 97 * face of object destruction (i.e. we can't allow a get on an 98 * object after last put) */ 99 static DEFINE_MUTEX(sr_ref_mutex); 100 101 static int sr_open(struct cdrom_device_info *, int); 102 static void sr_release(struct cdrom_device_info *); 103 104 static void get_sectorsize(struct scsi_cd *); 105 static void get_capabilities(struct scsi_cd *); 106 107 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 108 unsigned int clearing, int slot); 109 static int sr_packet(struct cdrom_device_info *, struct packet_command *); 110 111 static struct cdrom_device_ops sr_dops = { 112 .open = sr_open, 113 .release = sr_release, 114 .drive_status = sr_drive_status, 115 .check_events = sr_check_events, 116 .tray_move = sr_tray_move, 117 .lock_door = sr_lock_door, 118 .select_speed = sr_select_speed, 119 .get_last_session = sr_get_last_session, 120 .get_mcn = sr_get_mcn, 121 .reset = sr_reset, 122 .audio_ioctl = sr_audio_ioctl, 123 .capability = SR_CAPABILITIES, 124 .generic_packet = sr_packet, 125 }; 126 127 static void sr_kref_release(struct kref *kref); 128 129 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 130 { 131 return container_of(disk->private_data, struct scsi_cd, driver); 132 } 133 134 /* 135 * The get and put routines for the struct scsi_cd. Note this entity 136 * has a scsi_device pointer and owns a reference to this. 137 */ 138 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 139 { 140 struct scsi_cd *cd = NULL; 141 142 mutex_lock(&sr_ref_mutex); 143 if (disk->private_data == NULL) 144 goto out; 145 cd = scsi_cd(disk); 146 kref_get(&cd->kref); 147 if (scsi_device_get(cd->device)) 148 goto out_put; 149 goto out; 150 151 out_put: 152 kref_put(&cd->kref, sr_kref_release); 153 cd = NULL; 154 out: 155 mutex_unlock(&sr_ref_mutex); 156 return cd; 157 } 158 159 static void scsi_cd_put(struct scsi_cd *cd) 160 { 161 struct scsi_device *sdev = cd->device; 162 163 mutex_lock(&sr_ref_mutex); 164 kref_put(&cd->kref, sr_kref_release); 165 scsi_device_put(sdev); 166 mutex_unlock(&sr_ref_mutex); 167 } 168 169 static unsigned int sr_get_events(struct scsi_device *sdev) 170 { 171 u8 buf[8]; 172 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 173 1, /* polled */ 174 0, 0, /* reserved */ 175 1 << 4, /* notification class: media */ 176 0, 0, /* reserved */ 177 0, sizeof(buf), /* allocation length */ 178 0, /* control */ 179 }; 180 struct event_header *eh = (void *)buf; 181 struct media_event_desc *med = (void *)(buf + 4); 182 struct scsi_sense_hdr sshdr; 183 int result; 184 185 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 186 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 187 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 188 return DISK_EVENT_MEDIA_CHANGE; 189 190 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 191 return 0; 192 193 if (eh->nea || eh->notification_class != 0x4) 194 return 0; 195 196 if (med->media_event_code == 1) 197 return DISK_EVENT_EJECT_REQUEST; 198 else if (med->media_event_code == 2) 199 return DISK_EVENT_MEDIA_CHANGE; 200 return 0; 201 } 202 203 /* 204 * This function checks to see if the media has been changed or eject 205 * button has been pressed. It is possible that we have already 206 * sensed a change, or the drive may have sensed one and not yet 207 * reported it. The past events are accumulated in sdev->changed and 208 * returned together with the current state. 209 */ 210 static unsigned int sr_check_events(struct cdrom_device_info *cdi, 211 unsigned int clearing, int slot) 212 { 213 struct scsi_cd *cd = cdi->handle; 214 bool last_present; 215 struct scsi_sense_hdr sshdr; 216 unsigned int events; 217 int ret; 218 219 /* no changer support */ 220 if (CDSL_CURRENT != slot) 221 return 0; 222 223 events = sr_get_events(cd->device); 224 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 225 226 /* 227 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 228 * for several times in a row. We rely on TUR only for this likely 229 * broken device, to prevent generating incorrect media changed 230 * events for every open(). 231 */ 232 if (cd->ignore_get_event) { 233 events &= ~DISK_EVENT_MEDIA_CHANGE; 234 goto do_tur; 235 } 236 237 /* 238 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 239 * is being cleared. Note that there are devices which hang 240 * if asked to execute TUR repeatedly. 241 */ 242 if (cd->device->changed) { 243 events |= DISK_EVENT_MEDIA_CHANGE; 244 cd->device->changed = 0; 245 cd->tur_changed = true; 246 } 247 248 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 249 return events; 250 do_tur: 251 /* let's see whether the media is there with TUR */ 252 last_present = cd->media_present; 253 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 254 255 /* 256 * Media is considered to be present if TUR succeeds or fails with 257 * sense data indicating something other than media-not-present 258 * (ASC 0x3a). 259 */ 260 cd->media_present = scsi_status_is_good(ret) || 261 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 262 263 if (last_present != cd->media_present) 264 cd->device->changed = 1; 265 266 if (cd->device->changed) { 267 events |= DISK_EVENT_MEDIA_CHANGE; 268 cd->device->changed = 0; 269 cd->tur_changed = true; 270 } 271 272 if (cd->ignore_get_event) 273 return events; 274 275 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 276 if (!cd->tur_changed) { 277 if (cd->get_event_changed) { 278 if (cd->tur_mismatch++ > 8) { 279 sdev_printk(KERN_WARNING, cd->device, 280 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 281 cd->ignore_get_event = true; 282 } 283 } else { 284 cd->tur_mismatch = 0; 285 } 286 } 287 cd->tur_changed = false; 288 cd->get_event_changed = false; 289 290 return events; 291 } 292 293 /* 294 * sr_done is the interrupt routine for the device driver. 295 * 296 * It will be notified on the end of a SCSI read / write, and will take one 297 * of several actions based on success or failure. 298 */ 299 static int sr_done(struct scsi_cmnd *SCpnt) 300 { 301 int result = SCpnt->result; 302 int this_count = scsi_bufflen(SCpnt); 303 int good_bytes = (result == 0 ? this_count : 0); 304 int block_sectors = 0; 305 long error_sector; 306 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 307 308 #ifdef DEBUG 309 printk("sr.c done: %x\n", result); 310 #endif 311 312 /* 313 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 314 * success. Since this is a relatively rare error condition, no 315 * care is taken to avoid unnecessary additional work such as 316 * memcpy's that could be avoided. 317 */ 318 if (driver_byte(result) != 0 && /* An error occurred */ 319 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 320 switch (SCpnt->sense_buffer[2]) { 321 case MEDIUM_ERROR: 322 case VOLUME_OVERFLOW: 323 case ILLEGAL_REQUEST: 324 if (!(SCpnt->sense_buffer[0] & 0x90)) 325 break; 326 error_sector = (SCpnt->sense_buffer[3] << 24) | 327 (SCpnt->sense_buffer[4] << 16) | 328 (SCpnt->sense_buffer[5] << 8) | 329 SCpnt->sense_buffer[6]; 330 if (SCpnt->request->bio != NULL) 331 block_sectors = 332 bio_sectors(SCpnt->request->bio); 333 if (block_sectors < 4) 334 block_sectors = 4; 335 if (cd->device->sector_size == 2048) 336 error_sector <<= 2; 337 error_sector &= ~(block_sectors - 1); 338 good_bytes = (error_sector - 339 blk_rq_pos(SCpnt->request)) << 9; 340 if (good_bytes < 0 || good_bytes >= this_count) 341 good_bytes = 0; 342 /* 343 * The SCSI specification allows for the value 344 * returned by READ CAPACITY to be up to 75 2K 345 * sectors past the last readable block. 346 * Therefore, if we hit a medium error within the 347 * last 75 2K sectors, we decrease the saved size 348 * value. 349 */ 350 if (error_sector < get_capacity(cd->disk) && 351 cd->capacity - error_sector < 4 * 75) 352 set_capacity(cd->disk, error_sector); 353 break; 354 355 case RECOVERED_ERROR: 356 good_bytes = this_count; 357 break; 358 359 default: 360 break; 361 } 362 } 363 364 return good_bytes; 365 } 366 367 static int sr_prep_fn(struct request_queue *q, struct request *rq) 368 { 369 int block = 0, this_count, s_size; 370 struct scsi_cd *cd; 371 struct scsi_cmnd *SCpnt; 372 struct scsi_device *sdp = q->queuedata; 373 int ret; 374 375 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 376 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 377 goto out; 378 } else if (rq->cmd_type != REQ_TYPE_FS) { 379 ret = BLKPREP_KILL; 380 goto out; 381 } 382 ret = scsi_setup_fs_cmnd(sdp, rq); 383 if (ret != BLKPREP_OK) 384 goto out; 385 SCpnt = rq->special; 386 cd = scsi_cd(rq->rq_disk); 387 388 /* from here on until we're complete, any goto out 389 * is used for a killable error condition */ 390 ret = BLKPREP_KILL; 391 392 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 393 cd->disk->disk_name, block)); 394 395 if (!cd->device || !scsi_device_online(cd->device)) { 396 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n", 397 blk_rq_sectors(rq))); 398 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 399 goto out; 400 } 401 402 if (cd->device->changed) { 403 /* 404 * quietly refuse to do anything to a changed disc until the 405 * changed bit has been reset 406 */ 407 goto out; 408 } 409 410 /* 411 * we do lazy blocksize switching (when reading XA sectors, 412 * see CDROMREADMODE2 ioctl) 413 */ 414 s_size = cd->device->sector_size; 415 if (s_size > 2048) { 416 if (!in_interrupt()) 417 sr_set_blocklength(cd, 2048); 418 else 419 printk("sr: can't switch blocksize: in interrupt\n"); 420 } 421 422 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 423 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 424 goto out; 425 } 426 427 if (rq_data_dir(rq) == WRITE) { 428 if (!cd->device->writeable) 429 goto out; 430 SCpnt->cmnd[0] = WRITE_10; 431 SCpnt->sc_data_direction = DMA_TO_DEVICE; 432 cd->cdi.media_written = 1; 433 } else if (rq_data_dir(rq) == READ) { 434 SCpnt->cmnd[0] = READ_10; 435 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 436 } else { 437 blk_dump_rq_flags(rq, "Unknown sr command"); 438 goto out; 439 } 440 441 { 442 struct scatterlist *sg; 443 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 444 445 scsi_for_each_sg(SCpnt, sg, sg_count, i) 446 size += sg->length; 447 448 if (size != scsi_bufflen(SCpnt)) { 449 scmd_printk(KERN_ERR, SCpnt, 450 "mismatch count %d, bytes %d\n", 451 size, scsi_bufflen(SCpnt)); 452 if (scsi_bufflen(SCpnt) > size) 453 SCpnt->sdb.length = size; 454 } 455 } 456 457 /* 458 * request doesn't start on hw block boundary, add scatter pads 459 */ 460 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 461 (scsi_bufflen(SCpnt) % s_size)) { 462 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 463 goto out; 464 } 465 466 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 467 468 469 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n", 470 cd->cdi.name, 471 (rq_data_dir(rq) == WRITE) ? 472 "writing" : "reading", 473 this_count, blk_rq_sectors(rq))); 474 475 SCpnt->cmnd[1] = 0; 476 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 477 478 if (this_count > 0xffff) { 479 this_count = 0xffff; 480 SCpnt->sdb.length = this_count * s_size; 481 } 482 483 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 484 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 485 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 486 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 487 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 488 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 489 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 490 491 /* 492 * We shouldn't disconnect in the middle of a sector, so with a dumb 493 * host adapter, it's safe to assume that we can at least transfer 494 * this many bytes between each connect / disconnect. 495 */ 496 SCpnt->transfersize = cd->device->sector_size; 497 SCpnt->underflow = this_count << 9; 498 SCpnt->allowed = MAX_RETRIES; 499 500 /* 501 * This indicates that the command is ready from our end to be 502 * queued. 503 */ 504 ret = BLKPREP_OK; 505 out: 506 return scsi_prep_return(q, rq, ret); 507 } 508 509 static int sr_block_open(struct block_device *bdev, fmode_t mode) 510 { 511 struct scsi_cd *cd; 512 int ret = -ENXIO; 513 514 mutex_lock(&sr_mutex); 515 cd = scsi_cd_get(bdev->bd_disk); 516 if (cd) { 517 ret = cdrom_open(&cd->cdi, bdev, mode); 518 if (ret) 519 scsi_cd_put(cd); 520 } 521 mutex_unlock(&sr_mutex); 522 return ret; 523 } 524 525 static int sr_block_release(struct gendisk *disk, fmode_t mode) 526 { 527 struct scsi_cd *cd = scsi_cd(disk); 528 mutex_lock(&sr_mutex); 529 cdrom_release(&cd->cdi, mode); 530 scsi_cd_put(cd); 531 mutex_unlock(&sr_mutex); 532 return 0; 533 } 534 535 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 536 unsigned long arg) 537 { 538 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 539 struct scsi_device *sdev = cd->device; 540 void __user *argp = (void __user *)arg; 541 int ret; 542 543 mutex_lock(&sr_mutex); 544 545 /* 546 * Send SCSI addressing ioctls directly to mid level, send other 547 * ioctls to cdrom/block level. 548 */ 549 switch (cmd) { 550 case SCSI_IOCTL_GET_IDLUN: 551 case SCSI_IOCTL_GET_BUS_NUMBER: 552 ret = scsi_ioctl(sdev, cmd, argp); 553 goto out; 554 } 555 556 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 557 if (ret != -ENOSYS) 558 goto out; 559 560 /* 561 * ENODEV means that we didn't recognise the ioctl, or that we 562 * cannot execute it in the current device state. In either 563 * case fall through to scsi_ioctl, which will return ENDOEV again 564 * if it doesn't recognise the ioctl 565 */ 566 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, 567 (mode & FMODE_NDELAY) != 0); 568 if (ret != -ENODEV) 569 goto out; 570 ret = scsi_ioctl(sdev, cmd, argp); 571 572 out: 573 mutex_unlock(&sr_mutex); 574 return ret; 575 } 576 577 static unsigned int sr_block_check_events(struct gendisk *disk, 578 unsigned int clearing) 579 { 580 struct scsi_cd *cd = scsi_cd(disk); 581 return cdrom_check_events(&cd->cdi, clearing); 582 } 583 584 static int sr_block_revalidate_disk(struct gendisk *disk) 585 { 586 struct scsi_cd *cd = scsi_cd(disk); 587 struct scsi_sense_hdr sshdr; 588 589 /* if the unit is not ready, nothing more to do */ 590 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 591 return 0; 592 593 sr_cd_check(&cd->cdi); 594 get_sectorsize(cd); 595 return 0; 596 } 597 598 static const struct block_device_operations sr_bdops = 599 { 600 .owner = THIS_MODULE, 601 .open = sr_block_open, 602 .release = sr_block_release, 603 .ioctl = sr_block_ioctl, 604 .check_events = sr_block_check_events, 605 .revalidate_disk = sr_block_revalidate_disk, 606 /* 607 * No compat_ioctl for now because sr_block_ioctl never 608 * seems to pass arbitrary ioctls down to host drivers. 609 */ 610 }; 611 612 static int sr_open(struct cdrom_device_info *cdi, int purpose) 613 { 614 struct scsi_cd *cd = cdi->handle; 615 struct scsi_device *sdev = cd->device; 616 int retval; 617 618 /* 619 * If the device is in error recovery, wait until it is done. 620 * If the device is offline, then disallow any access to it. 621 */ 622 retval = -ENXIO; 623 if (!scsi_block_when_processing_errors(sdev)) 624 goto error_out; 625 626 return 0; 627 628 error_out: 629 return retval; 630 } 631 632 static void sr_release(struct cdrom_device_info *cdi) 633 { 634 struct scsi_cd *cd = cdi->handle; 635 636 if (cd->device->sector_size > 2048) 637 sr_set_blocklength(cd, 2048); 638 639 } 640 641 static int sr_probe(struct device *dev) 642 { 643 struct scsi_device *sdev = to_scsi_device(dev); 644 struct gendisk *disk; 645 struct scsi_cd *cd; 646 int minor, error; 647 648 error = -ENODEV; 649 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 650 goto fail; 651 652 error = -ENOMEM; 653 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 654 if (!cd) 655 goto fail; 656 657 kref_init(&cd->kref); 658 659 disk = alloc_disk(1); 660 if (!disk) 661 goto fail_free; 662 663 spin_lock(&sr_index_lock); 664 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 665 if (minor == SR_DISKS) { 666 spin_unlock(&sr_index_lock); 667 error = -EBUSY; 668 goto fail_put; 669 } 670 __set_bit(minor, sr_index_bits); 671 spin_unlock(&sr_index_lock); 672 673 disk->major = SCSI_CDROM_MAJOR; 674 disk->first_minor = minor; 675 sprintf(disk->disk_name, "sr%d", minor); 676 disk->fops = &sr_bdops; 677 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 678 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 679 680 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 681 682 cd->device = sdev; 683 cd->disk = disk; 684 cd->driver = &sr_template; 685 cd->disk = disk; 686 cd->capacity = 0x1fffff; 687 cd->device->changed = 1; /* force recheck CD type */ 688 cd->media_present = 1; 689 cd->use = 1; 690 cd->readcd_known = 0; 691 cd->readcd_cdda = 0; 692 693 cd->cdi.ops = &sr_dops; 694 cd->cdi.handle = cd; 695 cd->cdi.mask = 0; 696 cd->cdi.capacity = 1; 697 sprintf(cd->cdi.name, "sr%d", minor); 698 699 sdev->sector_size = 2048; /* A guess, just in case */ 700 701 /* FIXME: need to handle a get_capabilities failure properly ?? */ 702 get_capabilities(cd); 703 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); 704 sr_vendor_init(cd); 705 706 disk->driverfs_dev = &sdev->sdev_gendev; 707 set_capacity(disk, cd->capacity); 708 disk->private_data = &cd->driver; 709 disk->queue = sdev->request_queue; 710 cd->cdi.disk = disk; 711 712 if (register_cdrom(&cd->cdi)) 713 goto fail_put; 714 715 dev_set_drvdata(dev, cd); 716 disk->flags |= GENHD_FL_REMOVABLE; 717 add_disk(disk); 718 719 sdev_printk(KERN_DEBUG, sdev, 720 "Attached scsi CD-ROM %s\n", cd->cdi.name); 721 return 0; 722 723 fail_put: 724 put_disk(disk); 725 fail_free: 726 kfree(cd); 727 fail: 728 return error; 729 } 730 731 732 static void get_sectorsize(struct scsi_cd *cd) 733 { 734 unsigned char cmd[10]; 735 unsigned char buffer[8]; 736 int the_result, retries = 3; 737 int sector_size; 738 struct request_queue *queue; 739 740 do { 741 cmd[0] = READ_CAPACITY; 742 memset((void *) &cmd[1], 0, 9); 743 memset(buffer, 0, sizeof(buffer)); 744 745 /* Do the command and wait.. */ 746 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 747 buffer, sizeof(buffer), NULL, 748 SR_TIMEOUT, MAX_RETRIES, NULL); 749 750 retries--; 751 752 } while (the_result && retries); 753 754 755 if (the_result) { 756 cd->capacity = 0x1fffff; 757 sector_size = 2048; /* A guess, just in case */ 758 } else { 759 long last_written; 760 761 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | 762 (buffer[2] << 8) | buffer[3]); 763 /* 764 * READ_CAPACITY doesn't return the correct size on 765 * certain UDF media. If last_written is larger, use 766 * it instead. 767 * 768 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 769 */ 770 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 771 cd->capacity = max_t(long, cd->capacity, last_written); 772 773 sector_size = (buffer[4] << 24) | 774 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 775 switch (sector_size) { 776 /* 777 * HP 4020i CD-Recorder reports 2340 byte sectors 778 * Philips CD-Writers report 2352 byte sectors 779 * 780 * Use 2k sectors for them.. 781 */ 782 case 0: 783 case 2340: 784 case 2352: 785 sector_size = 2048; 786 /* fall through */ 787 case 2048: 788 cd->capacity *= 4; 789 /* fall through */ 790 case 512: 791 break; 792 default: 793 printk("%s: unsupported sector size %d.\n", 794 cd->cdi.name, sector_size); 795 cd->capacity = 0; 796 } 797 798 cd->device->sector_size = sector_size; 799 800 /* 801 * Add this so that we have the ability to correctly gauge 802 * what the device is capable of. 803 */ 804 set_capacity(cd->disk, cd->capacity); 805 } 806 807 queue = cd->device->request_queue; 808 blk_queue_logical_block_size(queue, sector_size); 809 810 return; 811 } 812 813 static void get_capabilities(struct scsi_cd *cd) 814 { 815 unsigned char *buffer; 816 struct scsi_mode_data data; 817 struct scsi_sense_hdr sshdr; 818 int rc, n; 819 820 static const char *loadmech[] = 821 { 822 "caddy", 823 "tray", 824 "pop-up", 825 "", 826 "changer", 827 "cartridge changer", 828 "", 829 "" 830 }; 831 832 833 /* allocate transfer buffer */ 834 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 835 if (!buffer) { 836 printk(KERN_ERR "sr: out of memory.\n"); 837 return; 838 } 839 840 /* eat unit attentions */ 841 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 842 843 /* ask for mode page 0x2a */ 844 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 845 SR_TIMEOUT, 3, &data, NULL); 846 847 if (!scsi_status_is_good(rc)) { 848 /* failed, drive doesn't have capabilities mode page */ 849 cd->cdi.speed = 1; 850 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 851 CDC_DVD | CDC_DVD_RAM | 852 CDC_SELECT_DISC | CDC_SELECT_SPEED | 853 CDC_MRW | CDC_MRW_W | CDC_RAM); 854 kfree(buffer); 855 printk("%s: scsi-1 drive\n", cd->cdi.name); 856 return; 857 } 858 859 n = data.header_length + data.block_descriptor_length; 860 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 861 cd->readcd_known = 1; 862 cd->readcd_cdda = buffer[n + 5] & 0x01; 863 /* print some capability bits */ 864 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 865 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 866 cd->cdi.speed, 867 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 868 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 869 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 870 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 871 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 872 loadmech[buffer[n + 6] >> 5]); 873 if ((buffer[n + 6] >> 5) == 0) 874 /* caddy drives can't close tray... */ 875 cd->cdi.mask |= CDC_CLOSE_TRAY; 876 if ((buffer[n + 2] & 0x8) == 0) 877 /* not a DVD drive */ 878 cd->cdi.mask |= CDC_DVD; 879 if ((buffer[n + 3] & 0x20) == 0) 880 /* can't write DVD-RAM media */ 881 cd->cdi.mask |= CDC_DVD_RAM; 882 if ((buffer[n + 3] & 0x10) == 0) 883 /* can't write DVD-R media */ 884 cd->cdi.mask |= CDC_DVD_R; 885 if ((buffer[n + 3] & 0x2) == 0) 886 /* can't write CD-RW media */ 887 cd->cdi.mask |= CDC_CD_RW; 888 if ((buffer[n + 3] & 0x1) == 0) 889 /* can't write CD-R media */ 890 cd->cdi.mask |= CDC_CD_R; 891 if ((buffer[n + 6] & 0x8) == 0) 892 /* can't eject */ 893 cd->cdi.mask |= CDC_OPEN_TRAY; 894 895 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 896 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 897 cd->cdi.capacity = 898 cdrom_number_of_slots(&cd->cdi); 899 if (cd->cdi.capacity <= 1) 900 /* not a changer */ 901 cd->cdi.mask |= CDC_SELECT_DISC; 902 /*else I don't think it can close its tray 903 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 904 905 /* 906 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 907 */ 908 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 909 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 910 cd->device->writeable = 1; 911 } 912 913 kfree(buffer); 914 } 915 916 /* 917 * sr_packet() is the entry point for the generic commands generated 918 * by the Uniform CD-ROM layer. 919 */ 920 static int sr_packet(struct cdrom_device_info *cdi, 921 struct packet_command *cgc) 922 { 923 struct scsi_cd *cd = cdi->handle; 924 struct scsi_device *sdev = cd->device; 925 926 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 927 return -EDRIVE_CANT_DO_THIS; 928 929 if (cgc->timeout <= 0) 930 cgc->timeout = IOCTL_TIMEOUT; 931 932 sr_do_ioctl(cd, cgc); 933 934 return cgc->stat; 935 } 936 937 /** 938 * sr_kref_release - Called to free the scsi_cd structure 939 * @kref: pointer to embedded kref 940 * 941 * sr_ref_mutex must be held entering this routine. Because it is 942 * called on last put, you should always use the scsi_cd_get() 943 * scsi_cd_put() helpers which manipulate the semaphore directly 944 * and never do a direct kref_put(). 945 **/ 946 static void sr_kref_release(struct kref *kref) 947 { 948 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 949 struct gendisk *disk = cd->disk; 950 951 spin_lock(&sr_index_lock); 952 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 953 spin_unlock(&sr_index_lock); 954 955 unregister_cdrom(&cd->cdi); 956 957 disk->private_data = NULL; 958 959 put_disk(disk); 960 961 kfree(cd); 962 } 963 964 static int sr_remove(struct device *dev) 965 { 966 struct scsi_cd *cd = dev_get_drvdata(dev); 967 968 blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn); 969 del_gendisk(cd->disk); 970 971 mutex_lock(&sr_ref_mutex); 972 kref_put(&cd->kref, sr_kref_release); 973 mutex_unlock(&sr_ref_mutex); 974 975 return 0; 976 } 977 978 static int __init init_sr(void) 979 { 980 int rc; 981 982 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 983 if (rc) 984 return rc; 985 rc = scsi_register_driver(&sr_template.gendrv); 986 if (rc) 987 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 988 989 return rc; 990 } 991 992 static void __exit exit_sr(void) 993 { 994 scsi_unregister_driver(&sr_template.gendrv); 995 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 996 } 997 998 module_init(init_sr); 999 module_exit(exit_sr); 1000 MODULE_LICENSE("GPL"); 1001