1 // SPDX-License-Identifier: GPL-2.0-only
3 * sr.c Copyright (C) 1992 David Giller
4 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
7 * sd.c Copyright (C) 1992 Drew Eckhardt
8 * Linux scsi disk driver by
9 * Drew Eckhardt <drew@colorado.edu>
11 * Modified by Eric Youngdale ericy@andante.org to
12 * add scatter-gather, multiple outstanding request, and other
15 * Modified by Eric Youngdale eric@andante.org to support loadable
16 * low-level scsi drivers.
18 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
21 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
22 * generic cdrom interface
24 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
25 * interface, capabilities probe additions, ioctl cleanups, etc.
27 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
29 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
30 * transparently and lose the GHOST hack
32 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
33 * check resource allocation in sr_init and some cleanups
36 #include <linux/module.h>
38 #include <linux/kernel.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>
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 */
63 #include "scsi_logging.h"
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
);
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)
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
);
89 static const struct dev_pm_ops sr_pm_ops
= {
90 .runtime_suspend
= sr_runtime_suspend
,
93 static struct scsi_driver sr_template
= {
101 .init_command
= sr_init_command
,
105 static unsigned long sr_index_bits
[SR_DISKS
/ BITS_PER_LONG
];
106 static DEFINE_SPINLOCK(sr_index_lock
);
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
);
113 static int sr_open(struct cdrom_device_info
*, int);
114 static void sr_release(struct cdrom_device_info
*);
116 static void get_sectorsize(struct scsi_cd
*);
117 static void get_capabilities(struct scsi_cd
*);
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
*);
123 static const struct cdrom_device_ops sr_dops
= {
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
,
134 .audio_ioctl
= sr_audio_ioctl
,
135 .capability
= SR_CAPABILITIES
,
136 .generic_packet
= sr_packet
,
139 static void sr_kref_release(struct kref
*kref
);
141 static inline struct scsi_cd
*scsi_cd(struct gendisk
*disk
)
143 return container_of(disk
->private_data
, struct scsi_cd
, driver
);
146 static int sr_runtime_suspend(struct device
*dev
)
148 struct scsi_cd
*cd
= dev_get_drvdata(dev
);
150 if (!cd
) /* E.g.: runtime suspend following sr_remove() */
153 if (cd
->media_present
)
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.
163 static inline struct scsi_cd
*scsi_cd_get(struct gendisk
*disk
)
165 struct scsi_cd
*cd
= NULL
;
167 mutex_lock(&sr_ref_mutex
);
168 if (disk
->private_data
== NULL
)
172 if (scsi_device_get(cd
->device
)) {
173 kref_put(&cd
->kref
, sr_kref_release
);
177 mutex_unlock(&sr_ref_mutex
);
181 static void scsi_cd_put(struct scsi_cd
*cd
)
183 struct scsi_device
*sdev
= cd
->device
;
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
);
191 static unsigned int sr_get_events(struct scsi_device
*sdev
)
194 u8 cmd
[] = { GET_EVENT_STATUS_NOTIFICATION
,
197 1 << 4, /* notification class: media */
199 0, sizeof(buf
), /* allocation length */
202 struct event_header
*eh
= (void *)buf
;
203 struct media_event_desc
*med
= (void *)(buf
+ 4);
204 struct scsi_sense_hdr sshdr
;
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
;
212 if (result
|| be16_to_cpu(eh
->data_len
) < sizeof(*med
))
215 if (eh
->nea
|| eh
->notification_class
!= 0x4)
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
;
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.
232 static unsigned int sr_check_events(struct cdrom_device_info
*cdi
,
233 unsigned int clearing
, int slot
)
235 struct scsi_cd
*cd
= cdi
->handle
;
237 struct scsi_sense_hdr sshdr
;
241 /* no changer support */
242 if (CDSL_CURRENT
!= slot
)
245 events
= sr_get_events(cd
->device
);
246 cd
->get_event_changed
|= events
& DISK_EVENT_MEDIA_CHANGE
;
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().
254 if (cd
->ignore_get_event
) {
255 events
&= ~DISK_EVENT_MEDIA_CHANGE
;
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.
264 if (cd
->device
->changed
) {
265 events
|= DISK_EVENT_MEDIA_CHANGE
;
266 cd
->device
->changed
= 0;
267 cd
->tur_changed
= true;
270 if (!(clearing
& DISK_EVENT_MEDIA_CHANGE
))
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
);
278 * Media is considered to be present if TUR succeeds or fails with
279 * sense data indicating something other than media-not-present
282 cd
->media_present
= scsi_status_is_good(ret
) ||
283 (scsi_sense_valid(&sshdr
) && sshdr
.asc
!= 0x3a);
285 if (last_present
!= cd
->media_present
)
286 cd
->device
->changed
= 1;
288 if (cd
->device
->changed
) {
289 events
|= DISK_EVENT_MEDIA_CHANGE
;
290 cd
->device
->changed
= 0;
291 cd
->tur_changed
= true;
294 if (cd
->ignore_get_event
)
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;
306 cd
->tur_mismatch
= 0;
309 cd
->tur_changed
= false;
310 cd
->get_event_changed
= false;
316 * sr_done is the interrupt routine for the device driver.
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.
321 static int sr_done(struct scsi_cmnd
*SCpnt
)
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;
328 struct scsi_cd
*cd
= scsi_cd(SCpnt
->request
->rq_disk
);
331 scmd_printk(KERN_INFO
, SCpnt
, "done: %x\n", result
);
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.
340 if (driver_byte(result
) != 0 && /* An error occurred */
341 (SCpnt
->sense_buffer
[0] & 0x7f) == 0x70) { /* Sense current */
342 switch (SCpnt
->sense_buffer
[2]) {
344 case VOLUME_OVERFLOW
:
345 case ILLEGAL_REQUEST
:
346 if (!(SCpnt
->sense_buffer
[0] & 0x90))
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
)
354 bio_sectors(SCpnt
->request
->bio
);
355 if (block_sectors
< 4)
357 if (cd
->device
->sector_size
== 2048)
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
)
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
372 if (error_sector
< get_capacity(cd
->disk
) &&
373 cd
->capacity
- error_sector
< 4 * 75)
374 set_capacity(cd
->disk
, error_sector
);
377 case RECOVERED_ERROR
:
378 good_bytes
= this_count
;
389 static blk_status_t
sr_init_command(struct scsi_cmnd
*SCpnt
)
391 int block
= 0, this_count
, s_size
;
393 struct request
*rq
= SCpnt
->request
;
396 ret
= scsi_init_io(SCpnt
);
397 if (ret
!= BLK_STS_OK
)
399 cd
= scsi_cd(rq
->rq_disk
);
401 /* from here on until we're complete, any goto out
402 * is used for a killable error condition */
405 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
406 "Doing sr request, block = %d\n", block
));
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
));
416 if (cd
->device
->changed
) {
418 * quietly refuse to do anything to a changed disc until the
419 * changed bit has been reset
425 * we do lazy blocksize switching (when reading XA sectors,
426 * see CDROMREADMODE2 ioctl)
428 s_size
= cd
->device
->sector_size
;
431 sr_set_blocklength(cd
, 2048);
433 scmd_printk(KERN_INFO
, SCpnt
,
434 "can't switch blocksize: in interrupt\n");
437 if (s_size
!= 512 && s_size
!= 1024 && s_size
!= 2048) {
438 scmd_printk(KERN_ERR
, SCpnt
, "bad sector size %d\n", s_size
);
442 switch (req_op(rq
)) {
446 SCpnt
->cmnd
[0] = WRITE_10
;
447 cd
->cdi
.media_written
= 1;
450 SCpnt
->cmnd
[0] = READ_10
;
453 blk_dump_rq_flags(rq
, "Unknown sr command");
458 struct scatterlist
*sg
;
459 int i
, size
= 0, sg_count
= scsi_sg_count(SCpnt
);
461 scsi_for_each_sg(SCpnt
, sg
, sg_count
, i
)
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
;
474 * request doesn't start on hw block boundary, add scatter pads
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");
482 this_count
= (scsi_bufflen(SCpnt
) >> 9) / (s_size
>> 9);
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
)));
492 block
= (unsigned int)blk_rq_pos(rq
) / (s_size
>> 9);
494 if (this_count
> 0xffff) {
496 SCpnt
->sdb
.length
= this_count
* s_size
;
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;
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.
512 SCpnt
->transfersize
= cd
->device
->sector_size
;
513 SCpnt
->underflow
= this_count
<< 9;
514 SCpnt
->allowed
= MAX_RETRIES
;
517 * This indicates that the command is ready from our end to be
525 static int sr_block_open(struct block_device
*bdev
, fmode_t mode
)
528 struct scsi_device
*sdev
;
531 cd
= scsi_cd_get(bdev
->bd_disk
);
536 scsi_autopm_get_device(sdev
);
537 check_disk_change(bdev
);
539 mutex_lock(&sr_mutex
);
540 ret
= cdrom_open(&cd
->cdi
, bdev
, mode
);
541 mutex_unlock(&sr_mutex
);
543 scsi_autopm_put_device(sdev
);
551 static void sr_block_release(struct gendisk
*disk
, fmode_t mode
)
553 struct scsi_cd
*cd
= scsi_cd(disk
);
554 mutex_lock(&sr_mutex
);
555 cdrom_release(&cd
->cdi
, mode
);
557 mutex_unlock(&sr_mutex
);
560 static int sr_block_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned cmd
,
563 struct scsi_cd
*cd
= scsi_cd(bdev
->bd_disk
);
564 struct scsi_device
*sdev
= cd
->device
;
565 void __user
*argp
= (void __user
*)arg
;
568 mutex_lock(&sr_mutex
);
570 ret
= scsi_ioctl_block_when_processing_errors(sdev
, cmd
,
571 (mode
& FMODE_NDELAY
) != 0);
575 scsi_autopm_get_device(sdev
);
578 * Send SCSI addressing ioctls directly to mid level, send other
579 * ioctls to cdrom/block level.
582 case SCSI_IOCTL_GET_IDLUN
:
583 case SCSI_IOCTL_GET_BUS_NUMBER
:
584 ret
= scsi_ioctl(sdev
, cmd
, argp
);
588 ret
= cdrom_ioctl(&cd
->cdi
, bdev
, mode
, cmd
, arg
);
592 ret
= scsi_ioctl(sdev
, cmd
, argp
);
595 scsi_autopm_put_device(sdev
);
598 mutex_unlock(&sr_mutex
);
603 static int sr_block_compat_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned cmd
,
606 struct scsi_cd
*cd
= scsi_cd(bdev
->bd_disk
);
607 struct scsi_device
*sdev
= cd
->device
;
608 void __user
*argp
= compat_ptr(arg
);
611 mutex_lock(&sr_mutex
);
613 ret
= scsi_ioctl_block_when_processing_errors(sdev
, cmd
,
614 (mode
& FMODE_NDELAY
) != 0);
618 scsi_autopm_get_device(sdev
);
621 * Send SCSI addressing ioctls directly to mid level, send other
622 * ioctls to cdrom/block level.
625 case SCSI_IOCTL_GET_IDLUN
:
626 case SCSI_IOCTL_GET_BUS_NUMBER
:
627 ret
= scsi_compat_ioctl(sdev
, cmd
, argp
);
631 ret
= cdrom_ioctl(&cd
->cdi
, bdev
, mode
, cmd
, (unsigned long)argp
);
635 ret
= scsi_compat_ioctl(sdev
, cmd
, argp
);
638 scsi_autopm_put_device(sdev
);
641 mutex_unlock(&sr_mutex
);
647 static unsigned int sr_block_check_events(struct gendisk
*disk
,
648 unsigned int clearing
)
650 unsigned int ret
= 0;
653 cd
= scsi_cd_get(disk
);
657 if (!atomic_read(&cd
->device
->disk_events_disable_depth
))
658 ret
= cdrom_check_events(&cd
->cdi
, clearing
);
664 static int sr_block_revalidate_disk(struct gendisk
*disk
)
666 struct scsi_sense_hdr sshdr
;
669 cd
= scsi_cd_get(disk
);
673 /* if the unit is not ready, nothing more to do */
674 if (scsi_test_unit_ready(cd
->device
, SR_TIMEOUT
, MAX_RETRIES
, &sshdr
))
677 sr_cd_check(&cd
->cdi
);
684 static const struct block_device_operations sr_bdops
=
686 .owner
= THIS_MODULE
,
687 .open
= sr_block_open
,
688 .release
= sr_block_release
,
689 .ioctl
= sr_block_ioctl
,
691 .compat_ioctl
= sr_block_compat_ioctl
,
693 .check_events
= sr_block_check_events
,
694 .revalidate_disk
= sr_block_revalidate_disk
,
697 static int sr_open(struct cdrom_device_info
*cdi
, int purpose
)
699 struct scsi_cd
*cd
= cdi
->handle
;
700 struct scsi_device
*sdev
= cd
->device
;
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.
708 if (!scsi_block_when_processing_errors(sdev
))
717 static void sr_release(struct cdrom_device_info
*cdi
)
719 struct scsi_cd
*cd
= cdi
->handle
;
721 if (cd
->device
->sector_size
> 2048)
722 sr_set_blocklength(cd
, 2048);
726 static int sr_probe(struct device
*dev
)
728 struct scsi_device
*sdev
= to_scsi_device(dev
);
729 struct gendisk
*disk
;
733 scsi_autopm_get_device(sdev
);
735 if (sdev
->type
!= TYPE_ROM
&& sdev
->type
!= TYPE_WORM
)
739 cd
= kzalloc(sizeof(*cd
), GFP_KERNEL
);
743 kref_init(&cd
->kref
);
745 disk
= alloc_disk(1);
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
);
756 __set_bit(minor
, sr_index_bits
);
757 spin_unlock(&sr_index_lock
);
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
;
767 blk_queue_rq_timeout(sdev
->request_queue
, SR_TIMEOUT
);
771 cd
->driver
= &sr_template
;
773 cd
->capacity
= 0x1fffff;
774 cd
->device
->changed
= 1; /* force recheck CD type */
775 cd
->media_present
= 1;
777 cd
->readcd_known
= 0;
780 cd
->cdi
.ops
= &sr_dops
;
783 cd
->cdi
.capacity
= 1;
784 sprintf(cd
->cdi
.name
, "sr%d", minor
);
786 sdev
->sector_size
= 2048; /* A guess, just in case */
788 /* FIXME: need to handle a get_capabilities failure properly ?? */
789 get_capabilities(cd
);
792 set_capacity(disk
, cd
->capacity
);
793 disk
->private_data
= &cd
->driver
;
794 disk
->queue
= sdev
->request_queue
;
797 if (register_cdrom(&cd
->cdi
))
801 * Initialize block layer runtime PM stuffs before the
802 * periodic event checking request gets started in add_disk.
804 blk_pm_runtime_init(sdev
->request_queue
, dev
);
806 dev_set_drvdata(dev
, cd
);
807 disk
->flags
|= GENHD_FL_REMOVABLE
;
808 device_add_disk(&sdev
->sdev_gendev
, disk
, NULL
);
810 sdev_printk(KERN_DEBUG
, sdev
,
811 "Attached scsi CD-ROM %s\n", cd
->cdi
.name
);
812 scsi_autopm_put_device(cd
->device
);
821 scsi_autopm_put_device(sdev
);
826 static void get_sectorsize(struct scsi_cd
*cd
)
828 unsigned char cmd
[10];
829 unsigned char buffer
[8];
830 int the_result
, retries
= 3;
832 struct request_queue
*queue
;
835 cmd
[0] = READ_CAPACITY
;
836 memset((void *) &cmd
[1], 0, 9);
837 memset(buffer
, 0, sizeof(buffer
));
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
);
846 } while (the_result
&& retries
);
850 cd
->capacity
= 0x1fffff;
851 sector_size
= 2048; /* A guess, just in case */
855 cd
->capacity
= 1 + ((buffer
[0] << 24) | (buffer
[1] << 16) |
856 (buffer
[2] << 8) | buffer
[3]);
858 * READ_CAPACITY doesn't return the correct size on
859 * certain UDF media. If last_written is larger, use
862 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
864 if (!cdrom_get_last_written(&cd
->cdi
, &last_written
))
865 cd
->capacity
= max_t(long, cd
->capacity
, last_written
);
867 sector_size
= (buffer
[4] << 24) |
868 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
869 switch (sector_size
) {
871 * HP 4020i CD-Recorder reports 2340 byte sectors
872 * Philips CD-Writers report 2352 byte sectors
874 * Use 2k sectors for them..
887 sr_printk(KERN_INFO
, cd
,
888 "unsupported sector size %d.", sector_size
);
892 cd
->device
->sector_size
= sector_size
;
895 * Add this so that we have the ability to correctly gauge
896 * what the device is capable of.
898 set_capacity(cd
->disk
, cd
->capacity
);
901 queue
= cd
->device
->request_queue
;
902 blk_queue_logical_block_size(queue
, sector_size
);
907 static void get_capabilities(struct scsi_cd
*cd
)
909 unsigned char *buffer
;
910 struct scsi_mode_data data
;
911 struct scsi_sense_hdr sshdr
;
912 unsigned int ms_len
= 128;
915 static const char *loadmech
[] =
928 /* allocate transfer buffer */
929 buffer
= kmalloc(512, GFP_KERNEL
| GFP_DMA
);
931 sr_printk(KERN_ERR
, cd
, "out of memory.\n");
935 /* eat unit attentions */
936 scsi_test_unit_ready(cd
->device
, SR_TIMEOUT
, MAX_RETRIES
, &sshdr
);
938 /* ask for mode page 0x2a */
939 rc
= scsi_mode_sense(cd
->device
, 0, 0x2a, buffer
, ms_len
,
940 SR_TIMEOUT
, 3, &data
, NULL
);
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 */
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
);
951 sr_printk(KERN_INFO
, cd
, "scsi-1 drive");
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,
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)
990 cd
->cdi
.mask
|= CDC_OPEN_TRAY
;
992 if ((buffer
[n
+ 6] >> 5) == mechtype_individual_changer
||
993 (buffer
[n
+ 6] >> 5) == mechtype_cartridge_changer
)
995 cdrom_number_of_slots(&cd
->cdi
);
996 if (cd
->cdi
.capacity
<= 1)
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; */
1003 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
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
)) {
1014 * sr_packet() is the entry point for the generic commands generated
1015 * by the Uniform CD-ROM layer.
1017 static int sr_packet(struct cdrom_device_info
*cdi
,
1018 struct packet_command
*cgc
)
1020 struct scsi_cd
*cd
= cdi
->handle
;
1021 struct scsi_device
*sdev
= cd
->device
;
1023 if (cgc
->cmd
[0] == GPCMD_READ_DISC_INFO
&& sdev
->no_read_disc_info
)
1024 return -EDRIVE_CANT_DO_THIS
;
1026 if (cgc
->timeout
<= 0)
1027 cgc
->timeout
= IOCTL_TIMEOUT
;
1029 sr_do_ioctl(cd
, cgc
);
1035 * sr_kref_release - Called to free the scsi_cd structure
1036 * @kref: pointer to embedded kref
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().
1043 static void sr_kref_release(struct kref
*kref
)
1045 struct scsi_cd
*cd
= container_of(kref
, struct scsi_cd
, kref
);
1046 struct gendisk
*disk
= cd
->disk
;
1048 spin_lock(&sr_index_lock
);
1049 clear_bit(MINOR(disk_devt(disk
)), sr_index_bits
);
1050 spin_unlock(&sr_index_lock
);
1052 unregister_cdrom(&cd
->cdi
);
1054 disk
->private_data
= NULL
;
1061 static int sr_remove(struct device
*dev
)
1063 struct scsi_cd
*cd
= dev_get_drvdata(dev
);
1065 scsi_autopm_get_device(cd
->device
);
1067 del_gendisk(cd
->disk
);
1068 dev_set_drvdata(dev
, NULL
);
1070 mutex_lock(&sr_ref_mutex
);
1071 kref_put(&cd
->kref
, sr_kref_release
);
1072 mutex_unlock(&sr_ref_mutex
);
1077 static int __init
init_sr(void)
1081 rc
= register_blkdev(SCSI_CDROM_MAJOR
, "sr");
1084 rc
= scsi_register_driver(&sr_template
.gendrv
);
1086 unregister_blkdev(SCSI_CDROM_MAJOR
, "sr");
1091 static void __exit
exit_sr(void)
1093 scsi_unregister_driver(&sr_template
.gendrv
);
1094 unregister_blkdev(SCSI_CDROM_MAJOR
, "sr");
1097 module_init(init_sr
);
1098 module_exit(exit_sr
);
1099 MODULE_LICENSE("GPL");