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/major.h>
48 #include <linux/blkdev.h>
49 #include <linux/blk-pm.h>
50 #include <linux/mutex.h>
51 #include <linux/slab.h>
52 #include <linux/pm_runtime.h>
53 #include <linux/uaccess.h>
55 #include <asm/unaligned.h>
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_dbg.h>
59 #include <scsi/scsi_device.h>
60 #include <scsi/scsi_driver.h>
61 #include <scsi/scsi_cmnd.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
66 #include "scsi_logging.h"
70 MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
71 MODULE_LICENSE("GPL");
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
73 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
74 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
78 #define SR_CAPABILITIES \
79 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
80 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
81 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
82 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
83 CDC_MRW|CDC_MRW_W|CDC_RAM)
85 static int sr_probe(struct device *);
86 static int sr_remove(struct device *);
87 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt);
88 static int sr_done(struct scsi_cmnd *);
89 static int sr_runtime_suspend(struct device *dev);
91 static const struct dev_pm_ops sr_pm_ops = {
92 .runtime_suspend = sr_runtime_suspend,
95 static struct scsi_driver sr_template = {
103 .init_command = sr_init_command,
107 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
108 static DEFINE_SPINLOCK(sr_index_lock);
110 static struct lock_class_key sr_bio_compl_lkclass;
112 static int sr_open(struct cdrom_device_info *, int);
113 static void sr_release(struct cdrom_device_info *);
115 static void get_sectorsize(struct scsi_cd *);
116 static int get_capabilities(struct scsi_cd *);
118 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
119 unsigned int clearing, int slot);
120 static int sr_packet(struct cdrom_device_info *, struct packet_command *);
121 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
122 u32 lba, u32 nr, u8 *last_sense);
124 static const struct cdrom_device_ops sr_dops = {
126 .release = sr_release,
127 .drive_status = sr_drive_status,
128 .check_events = sr_check_events,
129 .tray_move = sr_tray_move,
130 .lock_door = sr_lock_door,
131 .select_speed = sr_select_speed,
132 .get_last_session = sr_get_last_session,
133 .get_mcn = sr_get_mcn,
135 .audio_ioctl = sr_audio_ioctl,
136 .generic_packet = sr_packet,
137 .read_cdda_bpc = sr_read_cdda_bpc,
138 .capability = SR_CAPABILITIES,
141 static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
143 return disk->private_data;
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)
159 static unsigned int sr_get_events(struct scsi_device *sdev)
162 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
165 1 << 4, /* notification class: media */
167 0, sizeof(buf), /* allocation length */
170 struct event_header *eh = (void *)buf;
171 struct media_event_desc *med = (void *)(buf + 4);
172 struct scsi_sense_hdr sshdr;
175 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
176 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
177 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
178 return DISK_EVENT_MEDIA_CHANGE;
180 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
183 if (eh->nea || eh->notification_class != 0x4)
186 if (med->media_event_code == 1)
187 return DISK_EVENT_EJECT_REQUEST;
188 else if (med->media_event_code == 2)
189 return DISK_EVENT_MEDIA_CHANGE;
190 else if (med->media_event_code == 3)
191 return DISK_EVENT_MEDIA_CHANGE;
196 * This function checks to see if the media has been changed or eject
197 * button has been pressed. It is possible that we have already
198 * sensed a change, or the drive may have sensed one and not yet
199 * reported it. The past events are accumulated in sdev->changed and
200 * returned together with the current state.
202 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
203 unsigned int clearing, int slot)
205 struct scsi_cd *cd = cdi->handle;
207 struct scsi_sense_hdr sshdr;
211 /* no changer support */
212 if (CDSL_CURRENT != slot)
215 events = sr_get_events(cd->device);
216 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
219 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
220 * for several times in a row. We rely on TUR only for this likely
221 * broken device, to prevent generating incorrect media changed
222 * events for every open().
224 if (cd->ignore_get_event) {
225 events &= ~DISK_EVENT_MEDIA_CHANGE;
230 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
231 * is being cleared. Note that there are devices which hang
232 * if asked to execute TUR repeatedly.
234 if (cd->device->changed) {
235 events |= DISK_EVENT_MEDIA_CHANGE;
236 cd->device->changed = 0;
237 cd->tur_changed = true;
240 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
243 /* let's see whether the media is there with TUR */
244 last_present = cd->media_present;
245 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
248 * Media is considered to be present if TUR succeeds or fails with
249 * sense data indicating something other than media-not-present
252 cd->media_present = scsi_status_is_good(ret) ||
253 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
255 if (last_present != cd->media_present)
256 cd->device->changed = 1;
258 if (cd->device->changed) {
259 events |= DISK_EVENT_MEDIA_CHANGE;
260 cd->device->changed = 0;
261 cd->tur_changed = true;
264 if (cd->ignore_get_event)
267 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
268 if (!cd->tur_changed) {
269 if (cd->get_event_changed) {
270 if (cd->tur_mismatch++ > 8) {
271 sr_printk(KERN_WARNING, cd,
272 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
273 cd->ignore_get_event = true;
276 cd->tur_mismatch = 0;
279 cd->tur_changed = false;
280 cd->get_event_changed = false;
286 * sr_done is the interrupt routine for the device driver.
288 * It will be notified on the end of a SCSI read / write, and will take one
289 * of several actions based on success or failure.
291 static int sr_done(struct scsi_cmnd *SCpnt)
293 int result = SCpnt->result;
294 int this_count = scsi_bufflen(SCpnt);
295 int good_bytes = (result == 0 ? this_count : 0);
296 int block_sectors = 0;
298 struct request *rq = scsi_cmd_to_rq(SCpnt);
299 struct scsi_cd *cd = scsi_cd(rq->q->disk);
302 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
306 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
307 * success. Since this is a relatively rare error condition, no
308 * care is taken to avoid unnecessary additional work such as
309 * memcpy's that could be avoided.
311 if (scsi_status_is_check_condition(result) &&
312 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
313 switch (SCpnt->sense_buffer[2]) {
315 case VOLUME_OVERFLOW:
316 case ILLEGAL_REQUEST:
317 if (!(SCpnt->sense_buffer[0] & 0x90))
320 get_unaligned_be32(&SCpnt->sense_buffer[3]);
322 block_sectors = bio_sectors(rq->bio);
323 if (block_sectors < 4)
325 if (cd->device->sector_size == 2048)
327 error_sector &= ~(block_sectors - 1);
328 good_bytes = (error_sector - blk_rq_pos(rq)) << 9;
329 if (good_bytes < 0 || good_bytes >= this_count)
332 * The SCSI specification allows for the value
333 * returned by READ CAPACITY to be up to 75 2K
334 * sectors past the last readable block.
335 * Therefore, if we hit a medium error within the
336 * last 75 2K sectors, we decrease the saved size
339 if (error_sector < get_capacity(cd->disk) &&
340 cd->capacity - error_sector < 4 * 75)
341 set_capacity(cd->disk, error_sector);
344 case RECOVERED_ERROR:
345 good_bytes = this_count;
356 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
358 int block = 0, this_count, s_size;
360 struct request *rq = scsi_cmd_to_rq(SCpnt);
363 ret = scsi_alloc_sgtables(SCpnt);
364 if (ret != BLK_STS_OK)
366 cd = scsi_cd(rq->q->disk);
368 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
369 "Doing sr request, block = %d\n", block));
371 if (!cd->device || !scsi_device_online(cd->device)) {
372 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
373 "Finishing %u sectors\n", blk_rq_sectors(rq)));
374 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
375 "Retry with 0x%p\n", SCpnt));
379 if (cd->device->changed) {
381 * quietly refuse to do anything to a changed disc until the
382 * changed bit has been reset
387 s_size = cd->device->sector_size;
388 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
389 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
393 switch (req_op(rq)) {
397 SCpnt->cmnd[0] = WRITE_10;
398 cd->cdi.media_written = 1;
401 SCpnt->cmnd[0] = READ_10;
404 blk_dump_rq_flags(rq, "Unknown sr command");
409 struct scatterlist *sg;
410 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
412 scsi_for_each_sg(SCpnt, sg, sg_count, i)
415 if (size != scsi_bufflen(SCpnt)) {
416 scmd_printk(KERN_ERR, SCpnt,
417 "mismatch count %d, bytes %d\n",
418 size, scsi_bufflen(SCpnt));
419 if (scsi_bufflen(SCpnt) > size)
420 SCpnt->sdb.length = size;
425 * request doesn't start on hw block boundary, add scatter pads
427 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
428 (scsi_bufflen(SCpnt) % s_size)) {
429 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
433 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
436 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
437 "%s %d/%u 512 byte blocks.\n",
438 (rq_data_dir(rq) == WRITE) ?
439 "writing" : "reading",
440 this_count, blk_rq_sectors(rq)));
443 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
445 if (this_count > 0xffff) {
447 SCpnt->sdb.length = this_count * s_size;
450 put_unaligned_be32(block, &SCpnt->cmnd[2]);
451 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
452 put_unaligned_be16(this_count, &SCpnt->cmnd[7]);
455 * We shouldn't disconnect in the middle of a sector, so with a dumb
456 * host adapter, it's safe to assume that we can at least transfer
457 * this many bytes between each connect / disconnect.
459 SCpnt->transfersize = cd->device->sector_size;
460 SCpnt->underflow = this_count << 9;
461 SCpnt->allowed = MAX_RETRIES;
465 * This indicates that the command is ready from our end to be queued.
469 scsi_free_sgtables(SCpnt);
470 return BLK_STS_IOERR;
473 static void sr_revalidate_disk(struct scsi_cd *cd)
475 struct scsi_sense_hdr sshdr;
477 /* if the unit is not ready, nothing more to do */
478 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
480 sr_cd_check(&cd->cdi);
484 static int sr_block_open(struct block_device *bdev, fmode_t mode)
486 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
487 struct scsi_device *sdev = cd->device;
490 if (scsi_device_get(cd->device))
493 scsi_autopm_get_device(sdev);
494 if (bdev_check_media_change(bdev))
495 sr_revalidate_disk(cd);
497 mutex_lock(&cd->lock);
498 ret = cdrom_open(&cd->cdi, bdev, mode);
499 mutex_unlock(&cd->lock);
501 scsi_autopm_put_device(sdev);
503 scsi_device_put(cd->device);
507 static void sr_block_release(struct gendisk *disk, fmode_t mode)
509 struct scsi_cd *cd = scsi_cd(disk);
511 mutex_lock(&cd->lock);
512 cdrom_release(&cd->cdi, mode);
513 mutex_unlock(&cd->lock);
515 scsi_device_put(cd->device);
518 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
521 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
522 struct scsi_device *sdev = cd->device;
523 void __user *argp = (void __user *)arg;
526 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
529 mutex_lock(&cd->lock);
531 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
532 (mode & FMODE_NDELAY) != 0);
536 scsi_autopm_get_device(sdev);
538 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) {
539 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
543 ret = scsi_ioctl(sdev, mode, cmd, argp);
546 scsi_autopm_put_device(sdev);
548 mutex_unlock(&cd->lock);
552 static unsigned int sr_block_check_events(struct gendisk *disk,
553 unsigned int clearing)
555 struct scsi_cd *cd = disk->private_data;
557 if (atomic_read(&cd->device->disk_events_disable_depth))
559 return cdrom_check_events(&cd->cdi, clearing);
562 static void sr_free_disk(struct gendisk *disk)
564 struct scsi_cd *cd = disk->private_data;
566 spin_lock(&sr_index_lock);
567 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
568 spin_unlock(&sr_index_lock);
570 unregister_cdrom(&cd->cdi);
571 mutex_destroy(&cd->lock);
575 static const struct block_device_operations sr_bdops =
577 .owner = THIS_MODULE,
578 .open = sr_block_open,
579 .release = sr_block_release,
580 .ioctl = sr_block_ioctl,
581 .compat_ioctl = blkdev_compat_ptr_ioctl,
582 .check_events = sr_block_check_events,
583 .free_disk = sr_free_disk,
586 static int sr_open(struct cdrom_device_info *cdi, int purpose)
588 struct scsi_cd *cd = cdi->handle;
589 struct scsi_device *sdev = cd->device;
593 * If the device is in error recovery, wait until it is done.
594 * If the device is offline, then disallow any access to it.
597 if (!scsi_block_when_processing_errors(sdev))
606 static void sr_release(struct cdrom_device_info *cdi)
610 static int sr_probe(struct device *dev)
612 struct scsi_device *sdev = to_scsi_device(dev);
613 struct gendisk *disk;
617 scsi_autopm_get_device(sdev);
619 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
623 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
627 disk = __alloc_disk_node(sdev->request_queue, NUMA_NO_NODE,
628 &sr_bio_compl_lkclass);
631 mutex_init(&cd->lock);
633 spin_lock(&sr_index_lock);
634 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
635 if (minor == SR_DISKS) {
636 spin_unlock(&sr_index_lock);
640 __set_bit(minor, sr_index_bits);
641 spin_unlock(&sr_index_lock);
643 disk->major = SCSI_CDROM_MAJOR;
644 disk->first_minor = minor;
646 sprintf(disk->disk_name, "sr%d", minor);
647 disk->fops = &sr_bdops;
648 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
649 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
650 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT |
651 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE;
653 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
657 cd->capacity = 0x1fffff;
658 cd->device->changed = 1; /* force recheck CD type */
659 cd->media_present = 1;
661 cd->readcd_known = 0;
664 cd->cdi.ops = &sr_dops;
667 cd->cdi.capacity = 1;
668 sprintf(cd->cdi.name, "sr%d", minor);
670 sdev->sector_size = 2048; /* A guess, just in case */
673 if (get_capabilities(cd))
677 set_capacity(disk, cd->capacity);
678 disk->private_data = cd;
680 if (register_cdrom(disk, &cd->cdi))
684 * Initialize block layer runtime PM stuffs before the
685 * periodic event checking request gets started in add_disk.
687 blk_pm_runtime_init(sdev->request_queue, dev);
689 dev_set_drvdata(dev, cd);
690 sr_revalidate_disk(cd);
692 error = device_add_disk(&sdev->sdev_gendev, disk, NULL);
694 goto unregister_cdrom;
696 sdev_printk(KERN_DEBUG, sdev,
697 "Attached scsi CD-ROM %s\n", cd->cdi.name);
698 scsi_autopm_put_device(cd->device);
703 unregister_cdrom(&cd->cdi);
705 spin_lock(&sr_index_lock);
706 clear_bit(minor, sr_index_bits);
707 spin_unlock(&sr_index_lock);
710 mutex_destroy(&cd->lock);
714 scsi_autopm_put_device(sdev);
719 static void get_sectorsize(struct scsi_cd *cd)
721 unsigned char cmd[10];
722 unsigned char buffer[8];
723 int the_result, retries = 3;
725 struct request_queue *queue;
728 cmd[0] = READ_CAPACITY;
729 memset((void *) &cmd[1], 0, 9);
730 memset(buffer, 0, sizeof(buffer));
732 /* Do the command and wait.. */
733 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
734 buffer, sizeof(buffer), NULL,
735 SR_TIMEOUT, MAX_RETRIES, NULL);
739 } while (the_result && retries);
743 cd->capacity = 0x1fffff;
744 sector_size = 2048; /* A guess, just in case */
748 cd->capacity = 1 + get_unaligned_be32(&buffer[0]);
750 * READ_CAPACITY doesn't return the correct size on
751 * certain UDF media. If last_written is larger, use
754 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
756 if (!cdrom_get_last_written(&cd->cdi, &last_written))
757 cd->capacity = max_t(long, cd->capacity, last_written);
759 sector_size = get_unaligned_be32(&buffer[4]);
760 switch (sector_size) {
762 * HP 4020i CD-Recorder reports 2340 byte sectors
763 * Philips CD-Writers report 2352 byte sectors
765 * Use 2k sectors for them..
778 sr_printk(KERN_INFO, cd,
779 "unsupported sector size %d.", sector_size);
783 cd->device->sector_size = sector_size;
786 * Add this so that we have the ability to correctly gauge
787 * what the device is capable of.
789 set_capacity(cd->disk, cd->capacity);
792 queue = cd->device->request_queue;
793 blk_queue_logical_block_size(queue, sector_size);
798 static int get_capabilities(struct scsi_cd *cd)
800 unsigned char *buffer;
801 struct scsi_mode_data data;
802 struct scsi_sense_hdr sshdr;
803 unsigned int ms_len = 128;
806 static const char *loadmech[] =
819 /* allocate transfer buffer */
820 buffer = kmalloc(512, GFP_KERNEL);
822 sr_printk(KERN_ERR, cd, "out of memory.\n");
826 /* eat unit attentions */
827 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
829 /* ask for mode page 0x2a */
830 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len,
831 SR_TIMEOUT, 3, &data, NULL);
833 if (rc < 0 || data.length > ms_len ||
834 data.header_length + data.block_descriptor_length > data.length) {
835 /* failed, drive doesn't have capabilities mode page */
837 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
838 CDC_DVD | CDC_DVD_RAM |
839 CDC_SELECT_DISC | CDC_SELECT_SPEED |
840 CDC_MRW | CDC_MRW_W | CDC_RAM);
842 sr_printk(KERN_INFO, cd, "scsi-1 drive");
846 n = data.header_length + data.block_descriptor_length;
847 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176;
848 cd->readcd_known = 1;
849 cd->readcd_cdda = buffer[n + 5] & 0x01;
850 /* print some capability bits */
851 sr_printk(KERN_INFO, cd,
852 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
853 get_unaligned_be16(&buffer[n + 14]) / 176,
855 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
856 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
857 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
858 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
859 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
860 loadmech[buffer[n + 6] >> 5]);
861 if ((buffer[n + 6] >> 5) == 0)
862 /* caddy drives can't close tray... */
863 cd->cdi.mask |= CDC_CLOSE_TRAY;
864 if ((buffer[n + 2] & 0x8) == 0)
865 /* not a DVD drive */
866 cd->cdi.mask |= CDC_DVD;
867 if ((buffer[n + 3] & 0x20) == 0)
868 /* can't write DVD-RAM media */
869 cd->cdi.mask |= CDC_DVD_RAM;
870 if ((buffer[n + 3] & 0x10) == 0)
871 /* can't write DVD-R media */
872 cd->cdi.mask |= CDC_DVD_R;
873 if ((buffer[n + 3] & 0x2) == 0)
874 /* can't write CD-RW media */
875 cd->cdi.mask |= CDC_CD_RW;
876 if ((buffer[n + 3] & 0x1) == 0)
877 /* can't write CD-R media */
878 cd->cdi.mask |= CDC_CD_R;
879 if ((buffer[n + 6] & 0x8) == 0)
881 cd->cdi.mask |= CDC_OPEN_TRAY;
883 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
884 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
886 cdrom_number_of_slots(&cd->cdi);
887 if (cd->cdi.capacity <= 1)
889 cd->cdi.mask |= CDC_SELECT_DISC;
890 /*else I don't think it can close its tray
891 cd->cdi.mask |= CDC_CLOSE_TRAY; */
894 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
896 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
897 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
906 * sr_packet() is the entry point for the generic commands generated
907 * by the Uniform CD-ROM layer.
909 static int sr_packet(struct cdrom_device_info *cdi,
910 struct packet_command *cgc)
912 struct scsi_cd *cd = cdi->handle;
913 struct scsi_device *sdev = cd->device;
915 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
916 return -EDRIVE_CANT_DO_THIS;
918 if (cgc->timeout <= 0)
919 cgc->timeout = IOCTL_TIMEOUT;
921 sr_do_ioctl(cd, cgc);
926 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
927 u32 lba, u32 nr, u8 *last_sense)
929 struct gendisk *disk = cdi->disk;
930 u32 len = nr * CD_FRAMESIZE_RAW;
931 struct scsi_cmnd *scmd;
936 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0);
939 scmd = blk_mq_rq_to_pdu(rq);
941 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL);
943 goto out_put_request;
945 scmd->cmnd[0] = GPCMD_READ_CD;
946 scmd->cmnd[1] = 1 << 2;
947 scmd->cmnd[2] = (lba >> 24) & 0xff;
948 scmd->cmnd[3] = (lba >> 16) & 0xff;
949 scmd->cmnd[4] = (lba >> 8) & 0xff;
950 scmd->cmnd[5] = lba & 0xff;
951 scmd->cmnd[6] = (nr >> 16) & 0xff;
952 scmd->cmnd[7] = (nr >> 8) & 0xff;
953 scmd->cmnd[8] = nr & 0xff;
954 scmd->cmnd[9] = 0xf8;
956 rq->timeout = 60 * HZ;
959 blk_execute_rq(rq, false);
961 struct scsi_sense_hdr sshdr;
963 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,
965 *last_sense = sshdr.sense_key;
969 if (blk_rq_unmap_user(bio))
972 blk_mq_free_request(rq);
976 static int sr_remove(struct device *dev)
978 struct scsi_cd *cd = dev_get_drvdata(dev);
980 scsi_autopm_get_device(cd->device);
982 del_gendisk(cd->disk);
988 static int __init init_sr(void)
992 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
995 rc = scsi_register_driver(&sr_template.gendrv);
997 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1002 static void __exit exit_sr(void)
1004 scsi_unregister_driver(&sr_template.gendrv);
1005 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1008 module_init(init_sr);
1009 module_exit(exit_sr);
1010 MODULE_LICENSE("GPL");