sr.c revision a1b73fc194e73ed33c8b77bf09374cb05b58151b
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 <linux/pm_runtime.h> 49#include <asm/uaccess.h> 50 51#include <scsi/scsi.h> 52#include <scsi/scsi_dbg.h> 53#include <scsi/scsi_device.h> 54#include <scsi/scsi_driver.h> 55#include <scsi/scsi_cmnd.h> 56#include <scsi/scsi_eh.h> 57#include <scsi/scsi_host.h> 58#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ 59 60#include "scsi_logging.h" 61#include "sr.h" 62 63 64MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); 65MODULE_LICENSE("GPL"); 66MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); 67MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); 68MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); 69 70#define SR_DISKS 256 71 72#define SR_CAPABILITIES \ 73 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ 74 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ 75 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ 76 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ 77 CDC_MRW|CDC_MRW_W|CDC_RAM) 78 79static DEFINE_MUTEX(sr_mutex); 80static int sr_probe(struct device *); 81static int sr_remove(struct device *); 82static int sr_init_command(struct scsi_cmnd *SCpnt); 83static int sr_done(struct scsi_cmnd *); 84static int sr_runtime_suspend(struct device *dev); 85 86static struct dev_pm_ops sr_pm_ops = { 87 .runtime_suspend = sr_runtime_suspend, 88}; 89 90static struct scsi_driver sr_template = { 91 .owner = THIS_MODULE, 92 .gendrv = { 93 .name = "sr", 94 .probe = sr_probe, 95 .remove = sr_remove, 96 .pm = &sr_pm_ops, 97 }, 98 .init_command = sr_init_command, 99 .done = sr_done, 100}; 101 102static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; 103static DEFINE_SPINLOCK(sr_index_lock); 104 105/* This semaphore is used to mediate the 0->1 reference get in the 106 * face of object destruction (i.e. we can't allow a get on an 107 * object after last put) */ 108static DEFINE_MUTEX(sr_ref_mutex); 109 110static int sr_open(struct cdrom_device_info *, int); 111static void sr_release(struct cdrom_device_info *); 112 113static void get_sectorsize(struct scsi_cd *); 114static void get_capabilities(struct scsi_cd *); 115 116static unsigned int sr_check_events(struct cdrom_device_info *cdi, 117 unsigned int clearing, int slot); 118static int sr_packet(struct cdrom_device_info *, struct packet_command *); 119 120static struct cdrom_device_ops sr_dops = { 121 .open = sr_open, 122 .release = sr_release, 123 .drive_status = sr_drive_status, 124 .check_events = sr_check_events, 125 .tray_move = sr_tray_move, 126 .lock_door = sr_lock_door, 127 .select_speed = sr_select_speed, 128 .get_last_session = sr_get_last_session, 129 .get_mcn = sr_get_mcn, 130 .reset = sr_reset, 131 .audio_ioctl = sr_audio_ioctl, 132 .capability = SR_CAPABILITIES, 133 .generic_packet = sr_packet, 134}; 135 136static void sr_kref_release(struct kref *kref); 137 138static inline struct scsi_cd *scsi_cd(struct gendisk *disk) 139{ 140 return container_of(disk->private_data, struct scsi_cd, driver); 141} 142 143static int sr_runtime_suspend(struct device *dev) 144{ 145 struct scsi_cd *cd = dev_get_drvdata(dev); 146 147 if (cd->media_present) 148 return -EBUSY; 149 else 150 return 0; 151} 152 153/* 154 * The get and put routines for the struct scsi_cd. Note this entity 155 * has a scsi_device pointer and owns a reference to this. 156 */ 157static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) 158{ 159 struct scsi_cd *cd = NULL; 160 161 mutex_lock(&sr_ref_mutex); 162 if (disk->private_data == NULL) 163 goto out; 164 cd = scsi_cd(disk); 165 kref_get(&cd->kref); 166 if (scsi_device_get(cd->device)) { 167 kref_put(&cd->kref, sr_kref_release); 168 cd = NULL; 169 } 170 out: 171 mutex_unlock(&sr_ref_mutex); 172 return cd; 173} 174 175static void scsi_cd_put(struct scsi_cd *cd) 176{ 177 struct scsi_device *sdev = cd->device; 178 179 mutex_lock(&sr_ref_mutex); 180 kref_put(&cd->kref, sr_kref_release); 181 scsi_device_put(sdev); 182 mutex_unlock(&sr_ref_mutex); 183} 184 185static unsigned int sr_get_events(struct scsi_device *sdev) 186{ 187 u8 buf[8]; 188 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, 189 1, /* polled */ 190 0, 0, /* reserved */ 191 1 << 4, /* notification class: media */ 192 0, 0, /* reserved */ 193 0, sizeof(buf), /* allocation length */ 194 0, /* control */ 195 }; 196 struct event_header *eh = (void *)buf; 197 struct media_event_desc *med = (void *)(buf + 4); 198 struct scsi_sense_hdr sshdr; 199 int result; 200 201 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), 202 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); 203 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) 204 return DISK_EVENT_MEDIA_CHANGE; 205 206 if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) 207 return 0; 208 209 if (eh->nea || eh->notification_class != 0x4) 210 return 0; 211 212 if (med->media_event_code == 1) 213 return DISK_EVENT_EJECT_REQUEST; 214 else if (med->media_event_code == 2) 215 return DISK_EVENT_MEDIA_CHANGE; 216 return 0; 217} 218 219/* 220 * This function checks to see if the media has been changed or eject 221 * button has been pressed. It is possible that we have already 222 * sensed a change, or the drive may have sensed one and not yet 223 * reported it. The past events are accumulated in sdev->changed and 224 * returned together with the current state. 225 */ 226static unsigned int sr_check_events(struct cdrom_device_info *cdi, 227 unsigned int clearing, int slot) 228{ 229 struct scsi_cd *cd = cdi->handle; 230 bool last_present; 231 struct scsi_sense_hdr sshdr; 232 unsigned int events; 233 int ret; 234 235 /* no changer support */ 236 if (CDSL_CURRENT != slot) 237 return 0; 238 239 events = sr_get_events(cd->device); 240 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; 241 242 /* 243 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree 244 * for several times in a row. We rely on TUR only for this likely 245 * broken device, to prevent generating incorrect media changed 246 * events for every open(). 247 */ 248 if (cd->ignore_get_event) { 249 events &= ~DISK_EVENT_MEDIA_CHANGE; 250 goto do_tur; 251 } 252 253 /* 254 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE 255 * is being cleared. Note that there are devices which hang 256 * if asked to execute TUR repeatedly. 257 */ 258 if (cd->device->changed) { 259 events |= DISK_EVENT_MEDIA_CHANGE; 260 cd->device->changed = 0; 261 cd->tur_changed = true; 262 } 263 264 if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) 265 return events; 266do_tur: 267 /* let's see whether the media is there with TUR */ 268 last_present = cd->media_present; 269 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 270 271 /* 272 * Media is considered to be present if TUR succeeds or fails with 273 * sense data indicating something other than media-not-present 274 * (ASC 0x3a). 275 */ 276 cd->media_present = scsi_status_is_good(ret) || 277 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); 278 279 if (last_present != cd->media_present) 280 cd->device->changed = 1; 281 282 if (cd->device->changed) { 283 events |= DISK_EVENT_MEDIA_CHANGE; 284 cd->device->changed = 0; 285 cd->tur_changed = true; 286 } 287 288 if (cd->ignore_get_event) 289 return events; 290 291 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ 292 if (!cd->tur_changed) { 293 if (cd->get_event_changed) { 294 if (cd->tur_mismatch++ > 8) { 295 sdev_printk(KERN_WARNING, cd->device, 296 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); 297 cd->ignore_get_event = true; 298 } 299 } else { 300 cd->tur_mismatch = 0; 301 } 302 } 303 cd->tur_changed = false; 304 cd->get_event_changed = false; 305 306 return events; 307} 308 309/* 310 * sr_done is the interrupt routine for the device driver. 311 * 312 * It will be notified on the end of a SCSI read / write, and will take one 313 * of several actions based on success or failure. 314 */ 315static int sr_done(struct scsi_cmnd *SCpnt) 316{ 317 int result = SCpnt->result; 318 int this_count = scsi_bufflen(SCpnt); 319 int good_bytes = (result == 0 ? this_count : 0); 320 int block_sectors = 0; 321 long error_sector; 322 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); 323 324#ifdef DEBUG 325 printk("sr.c done: %x\n", result); 326#endif 327 328 /* 329 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial 330 * success. Since this is a relatively rare error condition, no 331 * care is taken to avoid unnecessary additional work such as 332 * memcpy's that could be avoided. 333 */ 334 if (driver_byte(result) != 0 && /* An error occurred */ 335 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ 336 switch (SCpnt->sense_buffer[2]) { 337 case MEDIUM_ERROR: 338 case VOLUME_OVERFLOW: 339 case ILLEGAL_REQUEST: 340 if (!(SCpnt->sense_buffer[0] & 0x90)) 341 break; 342 error_sector = (SCpnt->sense_buffer[3] << 24) | 343 (SCpnt->sense_buffer[4] << 16) | 344 (SCpnt->sense_buffer[5] << 8) | 345 SCpnt->sense_buffer[6]; 346 if (SCpnt->request->bio != NULL) 347 block_sectors = 348 bio_sectors(SCpnt->request->bio); 349 if (block_sectors < 4) 350 block_sectors = 4; 351 if (cd->device->sector_size == 2048) 352 error_sector <<= 2; 353 error_sector &= ~(block_sectors - 1); 354 good_bytes = (error_sector - 355 blk_rq_pos(SCpnt->request)) << 9; 356 if (good_bytes < 0 || good_bytes >= this_count) 357 good_bytes = 0; 358 /* 359 * The SCSI specification allows for the value 360 * returned by READ CAPACITY to be up to 75 2K 361 * sectors past the last readable block. 362 * Therefore, if we hit a medium error within the 363 * last 75 2K sectors, we decrease the saved size 364 * value. 365 */ 366 if (error_sector < get_capacity(cd->disk) && 367 cd->capacity - error_sector < 4 * 75) 368 set_capacity(cd->disk, error_sector); 369 break; 370 371 case RECOVERED_ERROR: 372 good_bytes = this_count; 373 break; 374 375 default: 376 break; 377 } 378 } 379 380 return good_bytes; 381} 382 383static int sr_init_command(struct scsi_cmnd *SCpnt) 384{ 385 int block = 0, this_count, s_size; 386 struct scsi_cd *cd; 387 struct request *rq = SCpnt->request; 388 struct scsi_device *sdp = SCpnt->device; 389 int ret; 390 391 ret = scsi_setup_fs_cmnd(sdp, rq); 392 if (ret != BLKPREP_OK) 393 goto out; 394 SCpnt = rq->special; 395 cd = scsi_cd(rq->rq_disk); 396 397 /* from here on until we're complete, any goto out 398 * is used for a killable error condition */ 399 ret = BLKPREP_KILL; 400 401 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", 402 cd->disk->disk_name, block)); 403 404 if (!cd->device || !scsi_device_online(cd->device)) { 405 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n", 406 blk_rq_sectors(rq))); 407 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); 408 goto out; 409 } 410 411 if (cd->device->changed) { 412 /* 413 * quietly refuse to do anything to a changed disc until the 414 * changed bit has been reset 415 */ 416 goto out; 417 } 418 419 /* 420 * we do lazy blocksize switching (when reading XA sectors, 421 * see CDROMREADMODE2 ioctl) 422 */ 423 s_size = cd->device->sector_size; 424 if (s_size > 2048) { 425 if (!in_interrupt()) 426 sr_set_blocklength(cd, 2048); 427 else 428 printk("sr: can't switch blocksize: in interrupt\n"); 429 } 430 431 if (s_size != 512 && s_size != 1024 && s_size != 2048) { 432 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); 433 goto out; 434 } 435 436 if (rq_data_dir(rq) == WRITE) { 437 if (!cd->device->writeable) 438 goto out; 439 SCpnt->cmnd[0] = WRITE_10; 440 SCpnt->sc_data_direction = DMA_TO_DEVICE; 441 cd->cdi.media_written = 1; 442 } else if (rq_data_dir(rq) == READ) { 443 SCpnt->cmnd[0] = READ_10; 444 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 445 } else { 446 blk_dump_rq_flags(rq, "Unknown sr command"); 447 goto out; 448 } 449 450 { 451 struct scatterlist *sg; 452 int i, size = 0, sg_count = scsi_sg_count(SCpnt); 453 454 scsi_for_each_sg(SCpnt, sg, sg_count, i) 455 size += sg->length; 456 457 if (size != scsi_bufflen(SCpnt)) { 458 scmd_printk(KERN_ERR, SCpnt, 459 "mismatch count %d, bytes %d\n", 460 size, scsi_bufflen(SCpnt)); 461 if (scsi_bufflen(SCpnt) > size) 462 SCpnt->sdb.length = size; 463 } 464 } 465 466 /* 467 * request doesn't start on hw block boundary, add scatter pads 468 */ 469 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || 470 (scsi_bufflen(SCpnt) % s_size)) { 471 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); 472 goto out; 473 } 474 475 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); 476 477 478 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n", 479 cd->cdi.name, 480 (rq_data_dir(rq) == WRITE) ? 481 "writing" : "reading", 482 this_count, blk_rq_sectors(rq))); 483 484 SCpnt->cmnd[1] = 0; 485 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); 486 487 if (this_count > 0xffff) { 488 this_count = 0xffff; 489 SCpnt->sdb.length = this_count * s_size; 490 } 491 492 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; 493 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; 494 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; 495 SCpnt->cmnd[5] = (unsigned char) block & 0xff; 496 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; 497 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; 498 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; 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; 508 509 /* 510 * This indicates that the command is ready from our end to be 511 * queued. 512 */ 513 ret = BLKPREP_OK; 514 out: 515 return ret; 516} 517 518static int sr_block_open(struct block_device *bdev, fmode_t mode) 519{ 520 struct scsi_cd *cd; 521 int ret = -ENXIO; 522 523 mutex_lock(&sr_mutex); 524 cd = scsi_cd_get(bdev->bd_disk); 525 if (cd) { 526 ret = cdrom_open(&cd->cdi, bdev, mode); 527 if (ret) 528 scsi_cd_put(cd); 529 } 530 mutex_unlock(&sr_mutex); 531 return ret; 532} 533 534static void sr_block_release(struct gendisk *disk, fmode_t mode) 535{ 536 struct scsi_cd *cd = scsi_cd(disk); 537 mutex_lock(&sr_mutex); 538 cdrom_release(&cd->cdi, mode); 539 scsi_cd_put(cd); 540 mutex_unlock(&sr_mutex); 541} 542 543static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 544 unsigned long arg) 545{ 546 struct scsi_cd *cd = scsi_cd(bdev->bd_disk); 547 struct scsi_device *sdev = cd->device; 548 void __user *argp = (void __user *)arg; 549 int ret; 550 551 mutex_lock(&sr_mutex); 552 553 /* 554 * Send SCSI addressing ioctls directly to mid level, send other 555 * ioctls to cdrom/block level. 556 */ 557 switch (cmd) { 558 case SCSI_IOCTL_GET_IDLUN: 559 case SCSI_IOCTL_GET_BUS_NUMBER: 560 ret = scsi_ioctl(sdev, cmd, argp); 561 goto out; 562 } 563 564 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); 565 if (ret != -ENOSYS) 566 goto out; 567 568 /* 569 * ENODEV means that we didn't recognise the ioctl, or that we 570 * cannot execute it in the current device state. In either 571 * case fall through to scsi_ioctl, which will return ENDOEV again 572 * if it doesn't recognise the ioctl 573 */ 574 ret = scsi_nonblockable_ioctl(sdev, cmd, argp, 575 (mode & FMODE_NDELAY) != 0); 576 if (ret != -ENODEV) 577 goto out; 578 ret = scsi_ioctl(sdev, cmd, argp); 579 580out: 581 mutex_unlock(&sr_mutex); 582 return ret; 583} 584 585static unsigned int sr_block_check_events(struct gendisk *disk, 586 unsigned int clearing) 587{ 588 struct scsi_cd *cd = scsi_cd(disk); 589 590 if (atomic_read(&cd->device->disk_events_disable_depth)) 591 return 0; 592 593 return cdrom_check_events(&cd->cdi, clearing); 594} 595 596static int sr_block_revalidate_disk(struct gendisk *disk) 597{ 598 struct scsi_cd *cd = scsi_cd(disk); 599 struct scsi_sense_hdr sshdr; 600 601 /* if the unit is not ready, nothing more to do */ 602 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) 603 goto out; 604 605 sr_cd_check(&cd->cdi); 606 get_sectorsize(cd); 607out: 608 return 0; 609} 610 611static const struct block_device_operations sr_bdops = 612{ 613 .owner = THIS_MODULE, 614 .open = sr_block_open, 615 .release = sr_block_release, 616 .ioctl = sr_block_ioctl, 617 .check_events = sr_block_check_events, 618 .revalidate_disk = sr_block_revalidate_disk, 619 /* 620 * No compat_ioctl for now because sr_block_ioctl never 621 * seems to pass arbitrary ioctls down to host drivers. 622 */ 623}; 624 625static int sr_open(struct cdrom_device_info *cdi, int purpose) 626{ 627 struct scsi_cd *cd = cdi->handle; 628 struct scsi_device *sdev = cd->device; 629 int retval; 630 631 /* 632 * If the device is in error recovery, wait until it is done. 633 * If the device is offline, then disallow any access to it. 634 */ 635 retval = -ENXIO; 636 if (!scsi_block_when_processing_errors(sdev)) 637 goto error_out; 638 639 return 0; 640 641error_out: 642 return retval; 643} 644 645static void sr_release(struct cdrom_device_info *cdi) 646{ 647 struct scsi_cd *cd = cdi->handle; 648 649 if (cd->device->sector_size > 2048) 650 sr_set_blocklength(cd, 2048); 651 652} 653 654static int sr_probe(struct device *dev) 655{ 656 struct scsi_device *sdev = to_scsi_device(dev); 657 struct gendisk *disk; 658 struct scsi_cd *cd; 659 int minor, error; 660 661 error = -ENODEV; 662 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) 663 goto fail; 664 665 error = -ENOMEM; 666 cd = kzalloc(sizeof(*cd), GFP_KERNEL); 667 if (!cd) 668 goto fail; 669 670 kref_init(&cd->kref); 671 672 disk = alloc_disk(1); 673 if (!disk) 674 goto fail_free; 675 676 spin_lock(&sr_index_lock); 677 minor = find_first_zero_bit(sr_index_bits, SR_DISKS); 678 if (minor == SR_DISKS) { 679 spin_unlock(&sr_index_lock); 680 error = -EBUSY; 681 goto fail_put; 682 } 683 __set_bit(minor, sr_index_bits); 684 spin_unlock(&sr_index_lock); 685 686 disk->major = SCSI_CDROM_MAJOR; 687 disk->first_minor = minor; 688 sprintf(disk->disk_name, "sr%d", minor); 689 disk->fops = &sr_bdops; 690 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; 691 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; 692 693 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); 694 695 cd->device = sdev; 696 cd->disk = disk; 697 cd->driver = &sr_template; 698 cd->disk = disk; 699 cd->capacity = 0x1fffff; 700 cd->device->changed = 1; /* force recheck CD type */ 701 cd->media_present = 1; 702 cd->use = 1; 703 cd->readcd_known = 0; 704 cd->readcd_cdda = 0; 705 706 cd->cdi.ops = &sr_dops; 707 cd->cdi.handle = cd; 708 cd->cdi.mask = 0; 709 cd->cdi.capacity = 1; 710 sprintf(cd->cdi.name, "sr%d", minor); 711 712 sdev->sector_size = 2048; /* A guess, just in case */ 713 714 /* FIXME: need to handle a get_capabilities failure properly ?? */ 715 get_capabilities(cd); 716 sr_vendor_init(cd); 717 718 disk->driverfs_dev = &sdev->sdev_gendev; 719 set_capacity(disk, cd->capacity); 720 disk->private_data = &cd->driver; 721 disk->queue = sdev->request_queue; 722 cd->cdi.disk = disk; 723 724 if (register_cdrom(&cd->cdi)) 725 goto fail_put; 726 727 /* 728 * Initialize block layer runtime PM stuffs before the 729 * periodic event checking request gets started in add_disk. 730 */ 731 blk_pm_runtime_init(sdev->request_queue, dev); 732 733 dev_set_drvdata(dev, cd); 734 disk->flags |= GENHD_FL_REMOVABLE; 735 add_disk(disk); 736 737 sdev_printk(KERN_DEBUG, sdev, 738 "Attached scsi CD-ROM %s\n", cd->cdi.name); 739 scsi_autopm_put_device(cd->device); 740 741 return 0; 742 743fail_put: 744 put_disk(disk); 745fail_free: 746 kfree(cd); 747fail: 748 return error; 749} 750 751 752static void get_sectorsize(struct scsi_cd *cd) 753{ 754 unsigned char cmd[10]; 755 unsigned char buffer[8]; 756 int the_result, retries = 3; 757 int sector_size; 758 struct request_queue *queue; 759 760 do { 761 cmd[0] = READ_CAPACITY; 762 memset((void *) &cmd[1], 0, 9); 763 memset(buffer, 0, sizeof(buffer)); 764 765 /* Do the command and wait.. */ 766 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, 767 buffer, sizeof(buffer), NULL, 768 SR_TIMEOUT, MAX_RETRIES, NULL); 769 770 retries--; 771 772 } while (the_result && retries); 773 774 775 if (the_result) { 776 cd->capacity = 0x1fffff; 777 sector_size = 2048; /* A guess, just in case */ 778 } else { 779 long last_written; 780 781 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | 782 (buffer[2] << 8) | buffer[3]); 783 /* 784 * READ_CAPACITY doesn't return the correct size on 785 * certain UDF media. If last_written is larger, use 786 * it instead. 787 * 788 * http://bugzilla.kernel.org/show_bug.cgi?id=9668 789 */ 790 if (!cdrom_get_last_written(&cd->cdi, &last_written)) 791 cd->capacity = max_t(long, cd->capacity, last_written); 792 793 sector_size = (buffer[4] << 24) | 794 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; 795 switch (sector_size) { 796 /* 797 * HP 4020i CD-Recorder reports 2340 byte sectors 798 * Philips CD-Writers report 2352 byte sectors 799 * 800 * Use 2k sectors for them.. 801 */ 802 case 0: 803 case 2340: 804 case 2352: 805 sector_size = 2048; 806 /* fall through */ 807 case 2048: 808 cd->capacity *= 4; 809 /* fall through */ 810 case 512: 811 break; 812 default: 813 printk("%s: unsupported sector size %d.\n", 814 cd->cdi.name, sector_size); 815 cd->capacity = 0; 816 } 817 818 cd->device->sector_size = sector_size; 819 820 /* 821 * Add this so that we have the ability to correctly gauge 822 * what the device is capable of. 823 */ 824 set_capacity(cd->disk, cd->capacity); 825 } 826 827 queue = cd->device->request_queue; 828 blk_queue_logical_block_size(queue, sector_size); 829 830 return; 831} 832 833static void get_capabilities(struct scsi_cd *cd) 834{ 835 unsigned char *buffer; 836 struct scsi_mode_data data; 837 struct scsi_sense_hdr sshdr; 838 int rc, n; 839 840 static const char *loadmech[] = 841 { 842 "caddy", 843 "tray", 844 "pop-up", 845 "", 846 "changer", 847 "cartridge changer", 848 "", 849 "" 850 }; 851 852 853 /* allocate transfer buffer */ 854 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); 855 if (!buffer) { 856 printk(KERN_ERR "sr: out of memory.\n"); 857 return; 858 } 859 860 /* eat unit attentions */ 861 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); 862 863 /* ask for mode page 0x2a */ 864 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, 865 SR_TIMEOUT, 3, &data, NULL); 866 867 if (!scsi_status_is_good(rc)) { 868 /* failed, drive doesn't have capabilities mode page */ 869 cd->cdi.speed = 1; 870 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | 871 CDC_DVD | CDC_DVD_RAM | 872 CDC_SELECT_DISC | CDC_SELECT_SPEED | 873 CDC_MRW | CDC_MRW_W | CDC_RAM); 874 kfree(buffer); 875 printk("%s: scsi-1 drive\n", cd->cdi.name); 876 return; 877 } 878 879 n = data.header_length + data.block_descriptor_length; 880 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; 881 cd->readcd_known = 1; 882 cd->readcd_cdda = buffer[n + 5] & 0x01; 883 /* print some capability bits */ 884 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, 885 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, 886 cd->cdi.speed, 887 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ 888 buffer[n + 3] & 0x20 ? "dvd-ram " : "", 889 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ 890 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ 891 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ 892 loadmech[buffer[n + 6] >> 5]); 893 if ((buffer[n + 6] >> 5) == 0) 894 /* caddy drives can't close tray... */ 895 cd->cdi.mask |= CDC_CLOSE_TRAY; 896 if ((buffer[n + 2] & 0x8) == 0) 897 /* not a DVD drive */ 898 cd->cdi.mask |= CDC_DVD; 899 if ((buffer[n + 3] & 0x20) == 0) 900 /* can't write DVD-RAM media */ 901 cd->cdi.mask |= CDC_DVD_RAM; 902 if ((buffer[n + 3] & 0x10) == 0) 903 /* can't write DVD-R media */ 904 cd->cdi.mask |= CDC_DVD_R; 905 if ((buffer[n + 3] & 0x2) == 0) 906 /* can't write CD-RW media */ 907 cd->cdi.mask |= CDC_CD_RW; 908 if ((buffer[n + 3] & 0x1) == 0) 909 /* can't write CD-R media */ 910 cd->cdi.mask |= CDC_CD_R; 911 if ((buffer[n + 6] & 0x8) == 0) 912 /* can't eject */ 913 cd->cdi.mask |= CDC_OPEN_TRAY; 914 915 if ((buffer[n + 6] >> 5) == mechtype_individual_changer || 916 (buffer[n + 6] >> 5) == mechtype_cartridge_changer) 917 cd->cdi.capacity = 918 cdrom_number_of_slots(&cd->cdi); 919 if (cd->cdi.capacity <= 1) 920 /* not a changer */ 921 cd->cdi.mask |= CDC_SELECT_DISC; 922 /*else I don't think it can close its tray 923 cd->cdi.mask |= CDC_CLOSE_TRAY; */ 924 925 /* 926 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable 927 */ 928 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != 929 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { 930 cd->device->writeable = 1; 931 } 932 933 kfree(buffer); 934} 935 936/* 937 * sr_packet() is the entry point for the generic commands generated 938 * by the Uniform CD-ROM layer. 939 */ 940static int sr_packet(struct cdrom_device_info *cdi, 941 struct packet_command *cgc) 942{ 943 struct scsi_cd *cd = cdi->handle; 944 struct scsi_device *sdev = cd->device; 945 946 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) 947 return -EDRIVE_CANT_DO_THIS; 948 949 if (cgc->timeout <= 0) 950 cgc->timeout = IOCTL_TIMEOUT; 951 952 sr_do_ioctl(cd, cgc); 953 954 return cgc->stat; 955} 956 957/** 958 * sr_kref_release - Called to free the scsi_cd structure 959 * @kref: pointer to embedded kref 960 * 961 * sr_ref_mutex must be held entering this routine. Because it is 962 * called on last put, you should always use the scsi_cd_get() 963 * scsi_cd_put() helpers which manipulate the semaphore directly 964 * and never do a direct kref_put(). 965 **/ 966static void sr_kref_release(struct kref *kref) 967{ 968 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); 969 struct gendisk *disk = cd->disk; 970 971 spin_lock(&sr_index_lock); 972 clear_bit(MINOR(disk_devt(disk)), sr_index_bits); 973 spin_unlock(&sr_index_lock); 974 975 unregister_cdrom(&cd->cdi); 976 977 disk->private_data = NULL; 978 979 put_disk(disk); 980 981 kfree(cd); 982} 983 984static int sr_remove(struct device *dev) 985{ 986 struct scsi_cd *cd = dev_get_drvdata(dev); 987 988 scsi_autopm_get_device(cd->device); 989 990 del_gendisk(cd->disk); 991 992 mutex_lock(&sr_ref_mutex); 993 kref_put(&cd->kref, sr_kref_release); 994 mutex_unlock(&sr_ref_mutex); 995 996 return 0; 997} 998 999static int __init init_sr(void) 1000{ 1001 int rc; 1002 1003 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); 1004 if (rc) 1005 return rc; 1006 rc = scsi_register_driver(&sr_template.gendrv); 1007 if (rc) 1008 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1009 1010 return rc; 1011} 1012 1013static void __exit exit_sr(void) 1014{ 1015 scsi_unregister_driver(&sr_template.gendrv); 1016 unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); 1017} 1018 1019module_init(init_sr); 1020module_exit(exit_sr); 1021MODULE_LICENSE("GPL"); 1022