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
12 * add scatter-gather, multiple outstanding request, and other
16 * low-level scsi drivers.
22 * generic cdrom interface
25 * interface, capabilities probe additions, ioctl cleanups, etc.
30 * transparently and lose the GHOST hack
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 <linux/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 = {
102 .init_command = sr_init_command,
106 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
107 static DEFINE_SPINLOCK(sr_index_lock);
109 static struct lock_class_key sr_bio_compl_lkclass;
111 static int sr_open(struct cdrom_device_info *, int);
112 static void sr_release(struct cdrom_device_info *);
114 static int get_sectorsize(struct scsi_cd *);
115 static int get_capabilities(struct scsi_cd *);
117 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
118 unsigned int clearing, int slot);
119 static int sr_packet(struct cdrom_device_info *, struct packet_command *);
120 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
121 u32 lba, u32 nr, u8 *last_sense);
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 .generic_packet = sr_packet,
136 .read_cdda_bpc = sr_read_cdda_bpc,
137 .capability = SR_CAPABILITIES,
140 static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
142 return disk->private_data;
145 static int sr_runtime_suspend(struct device *dev)
147 struct scsi_cd *cd = dev_get_drvdata(dev);
149 if (!cd) /* E.g.: runtime suspend following sr_remove() */
152 if (cd->media_present)
158 static unsigned int sr_get_events(struct scsi_device *sdev)
161 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
164 1 << 4, /* notification class: media */
166 0, sizeof(buf), /* allocation length */
169 struct event_header *eh = (void *)buf;
170 struct media_event_desc *med = (void *)(buf + 4);
171 struct scsi_sense_hdr sshdr;
172 const struct scsi_exec_args exec_args = {
177 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buf, sizeof(buf),
178 SR_TIMEOUT, MAX_RETRIES, &exec_args);
179 if (result > 0 && scsi_sense_valid(&sshdr) &&
180 sshdr.sense_key == UNIT_ATTENTION)
181 return DISK_EVENT_MEDIA_CHANGE;
183 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
186 if (eh->nea || eh->notification_class != 0x4)
189 if (med->media_event_code == 1)
190 return DISK_EVENT_EJECT_REQUEST;
191 else if (med->media_event_code == 2)
192 return DISK_EVENT_MEDIA_CHANGE;
193 else if (med->media_event_code == 3)
194 return DISK_EVENT_MEDIA_CHANGE;
199 * This function checks to see if the media has been changed or eject
200 * button has been pressed. It is possible that we have already
201 * sensed a change, or the drive may have sensed one and not yet
202 * reported it. The past events are accumulated in sdev->changed and
203 * returned together with the current state.
205 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
206 unsigned int clearing, int slot)
208 struct scsi_cd *cd = cdi->handle;
210 struct scsi_sense_hdr sshdr;
214 /* no changer support */
215 if (CDSL_CURRENT != slot)
218 events = sr_get_events(cd->device);
219 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
222 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
223 * for several times in a row. We rely on TUR only for this likely
224 * broken device, to prevent generating incorrect media changed
225 * events for every open().
227 if (cd->ignore_get_event) {
228 events &= ~DISK_EVENT_MEDIA_CHANGE;
233 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
234 * is being cleared. Note that there are devices which hang
235 * if asked to execute TUR repeatedly.
237 if (cd->device->changed) {
238 events |= DISK_EVENT_MEDIA_CHANGE;
239 cd->device->changed = 0;
240 cd->tur_changed = true;
243 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
246 /* let's see whether the media is there with TUR */
247 last_present = cd->media_present;
248 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
251 * Media is considered to be present if TUR succeeds or fails with
252 * sense data indicating something other than media-not-present
255 cd->media_present = scsi_status_is_good(ret) ||
256 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
258 if (last_present != cd->media_present)
259 cd->device->changed = 1;
261 if (cd->device->changed) {
262 events |= DISK_EVENT_MEDIA_CHANGE;
263 cd->device->changed = 0;
264 cd->tur_changed = true;
267 if (cd->ignore_get_event)
270 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
271 if (!cd->tur_changed) {
272 if (cd->get_event_changed) {
273 if (cd->tur_mismatch++ > 8) {
274 sr_printk(KERN_WARNING, cd,
275 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
276 cd->ignore_get_event = true;
279 cd->tur_mismatch = 0;
282 cd->tur_changed = false;
283 cd->get_event_changed = false;
289 * sr_done is the interrupt routine for the device driver.
291 * It will be notified on the end of a SCSI read / write, and will take one
292 * of several actions based on success or failure.
294 static int sr_done(struct scsi_cmnd *SCpnt)
296 int result = SCpnt->result;
297 int this_count = scsi_bufflen(SCpnt);
298 int good_bytes = (result == 0 ? this_count : 0);
299 int block_sectors = 0;
301 struct request *rq = scsi_cmd_to_rq(SCpnt);
302 struct scsi_cd *cd = scsi_cd(rq->q->disk);
305 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
309 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
310 * success. Since this is a relatively rare error condition, no
311 * care is taken to avoid unnecessary additional work such as
312 * memcpy's that could be avoided.
314 if (scsi_status_is_check_condition(result) &&
315 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
316 switch (SCpnt->sense_buffer[2]) {
318 case VOLUME_OVERFLOW:
319 case ILLEGAL_REQUEST:
320 if (!(SCpnt->sense_buffer[0] & 0x90))
323 get_unaligned_be32(&SCpnt->sense_buffer[3]);
325 block_sectors = bio_sectors(rq->bio);
326 if (block_sectors < 4)
328 if (cd->device->sector_size == 2048)
330 error_sector &= ~(block_sectors - 1);
331 good_bytes = (error_sector - blk_rq_pos(rq)) << 9;
332 if (good_bytes < 0 || good_bytes >= this_count)
335 * The SCSI specification allows for the value
336 * returned by READ CAPACITY to be up to 75 2K
337 * sectors past the last readable block.
338 * Therefore, if we hit a medium error within the
339 * last 75 2K sectors, we decrease the saved size
342 if (error_sector < get_capacity(cd->disk) &&
343 cd->capacity - error_sector < 4 * 75)
344 set_capacity(cd->disk, error_sector);
347 case RECOVERED_ERROR:
348 good_bytes = this_count;
359 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
361 int block = 0, this_count, s_size;
363 struct request *rq = scsi_cmd_to_rq(SCpnt);
366 ret = scsi_alloc_sgtables(SCpnt);
367 if (ret != BLK_STS_OK)
369 cd = scsi_cd(rq->q->disk);
371 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
372 "Doing sr request, block = %d\n", block));
374 if (!cd->device || !scsi_device_online(cd->device)) {
375 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
376 "Finishing %u sectors\n", blk_rq_sectors(rq)));
377 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
378 "Retry with 0x%p\n", SCpnt));
382 if (cd->device->changed) {
384 * quietly refuse to do anything to a changed disc until the
385 * changed bit has been reset
390 s_size = cd->device->sector_size;
391 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
392 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
396 switch (req_op(rq)) {
400 SCpnt->cmnd[0] = WRITE_10;
401 cd->cdi.media_written = 1;
404 SCpnt->cmnd[0] = READ_10;
407 blk_dump_rq_flags(rq, "Unknown sr command");
412 struct scatterlist *sg;
413 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
415 scsi_for_each_sg(SCpnt, sg, sg_count, i)
418 if (size != scsi_bufflen(SCpnt)) {
419 scmd_printk(KERN_ERR, SCpnt,
420 "mismatch count %d, bytes %d\n",
421 size, scsi_bufflen(SCpnt));
422 if (scsi_bufflen(SCpnt) > size)
423 SCpnt->sdb.length = size;
428 * request doesn't start on hw block boundary, add scatter pads
430 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
431 (scsi_bufflen(SCpnt) % s_size)) {
432 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
436 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
439 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
440 "%s %d/%u 512 byte blocks.\n",
441 (rq_data_dir(rq) == WRITE) ?
442 "writing" : "reading",
443 this_count, blk_rq_sectors(rq)));
446 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
448 if (this_count > 0xffff) {
450 SCpnt->sdb.length = this_count * s_size;
453 put_unaligned_be32(block, &SCpnt->cmnd[2]);
454 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
455 put_unaligned_be16(this_count, &SCpnt->cmnd[7]);
458 * We shouldn't disconnect in the middle of a sector, so with a dumb
459 * host adapter, it's safe to assume that we can at least transfer
460 * this many bytes between each connect / disconnect.
462 SCpnt->transfersize = cd->device->sector_size;
463 SCpnt->underflow = this_count << 9;
464 SCpnt->allowed = MAX_RETRIES;
468 * This indicates that the command is ready from our end to be queued.
472 scsi_free_sgtables(SCpnt);
473 return BLK_STS_IOERR;
476 static int sr_revalidate_disk(struct scsi_cd *cd)
478 struct scsi_sense_hdr sshdr;
480 /* if the unit is not ready, nothing more to do */
481 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
483 sr_cd_check(&cd->cdi);
484 return get_sectorsize(cd);
487 static int sr_block_open(struct gendisk *disk, blk_mode_t mode)
489 struct scsi_cd *cd = scsi_cd(disk);
490 struct scsi_device *sdev = cd->device;
493 if (scsi_device_get(cd->device))
496 scsi_autopm_get_device(sdev);
497 if (disk_check_media_change(disk)) {
498 ret = sr_revalidate_disk(cd);
503 mutex_lock(&cd->lock);
504 ret = cdrom_open(&cd->cdi, mode);
505 mutex_unlock(&cd->lock);
507 scsi_autopm_put_device(sdev);
509 scsi_device_put(cd->device);
513 static void sr_block_release(struct gendisk *disk)
515 struct scsi_cd *cd = scsi_cd(disk);
517 mutex_lock(&cd->lock);
518 cdrom_release(&cd->cdi);
519 mutex_unlock(&cd->lock);
521 scsi_device_put(cd->device);
524 static int sr_block_ioctl(struct block_device *bdev, blk_mode_t mode,
525 unsigned cmd, unsigned long arg)
527 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
528 struct scsi_device *sdev = cd->device;
529 void __user *argp = (void __user *)arg;
532 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
535 mutex_lock(&cd->lock);
537 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
538 (mode & BLK_OPEN_NDELAY));
542 scsi_autopm_get_device(sdev);
544 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) {
545 ret = cdrom_ioctl(&cd->cdi, bdev, cmd, arg);
549 ret = scsi_ioctl(sdev, mode & BLK_OPEN_WRITE, cmd, argp);
552 scsi_autopm_put_device(sdev);
554 mutex_unlock(&cd->lock);
558 static unsigned int sr_block_check_events(struct gendisk *disk,
559 unsigned int clearing)
561 struct scsi_cd *cd = disk->private_data;
563 if (atomic_read(&cd->device->disk_events_disable_depth))
565 return cdrom_check_events(&cd->cdi, clearing);
568 static void sr_free_disk(struct gendisk *disk)
570 struct scsi_cd *cd = disk->private_data;
572 spin_lock(&sr_index_lock);
573 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
574 spin_unlock(&sr_index_lock);
576 unregister_cdrom(&cd->cdi);
577 mutex_destroy(&cd->lock);
581 static const struct block_device_operations sr_bdops =
583 .owner = THIS_MODULE,
584 .open = sr_block_open,
585 .release = sr_block_release,
586 .ioctl = sr_block_ioctl,
587 .compat_ioctl = blkdev_compat_ptr_ioctl,
588 .check_events = sr_block_check_events,
589 .free_disk = sr_free_disk,
592 static int sr_open(struct cdrom_device_info *cdi, int purpose)
594 struct scsi_cd *cd = cdi->handle;
595 struct scsi_device *sdev = cd->device;
598 * If the device is in error recovery, wait until it is done.
599 * If the device is offline, then disallow any access to it.
601 if (!scsi_block_when_processing_errors(sdev))
607 static void sr_release(struct cdrom_device_info *cdi)
611 static int sr_probe(struct device *dev)
613 struct scsi_device *sdev = to_scsi_device(dev);
614 struct gendisk *disk;
618 scsi_autopm_get_device(sdev);
620 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
624 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
628 disk = blk_mq_alloc_disk_for_queue(sdev->request_queue,
629 &sr_bio_compl_lkclass);
632 mutex_init(&cd->lock);
634 spin_lock(&sr_index_lock);
635 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
636 if (minor == SR_DISKS) {
637 spin_unlock(&sr_index_lock);
641 __set_bit(minor, sr_index_bits);
642 spin_unlock(&sr_index_lock);
644 disk->major = SCSI_CDROM_MAJOR;
645 disk->first_minor = minor;
647 sprintf(disk->disk_name, "sr%d", minor);
648 disk->fops = &sr_bdops;
649 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
650 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
651 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT |
652 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE;
654 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
658 cd->capacity = 0x1fffff;
659 cd->device->changed = 1; /* force recheck CD type */
660 cd->media_present = 1;
662 cd->readcd_known = 0;
665 cd->cdi.ops = &sr_dops;
668 cd->cdi.capacity = 1;
669 sprintf(cd->cdi.name, "sr%d", minor);
671 sdev->sector_size = 2048; /* A guess, just in case */
674 if (get_capabilities(cd))
678 set_capacity(disk, cd->capacity);
679 disk->private_data = cd;
681 if (register_cdrom(disk, &cd->cdi))
685 * Initialize block layer runtime PM stuffs before the
686 * periodic event checking request gets started in add_disk.
688 blk_pm_runtime_init(sdev->request_queue, dev);
690 dev_set_drvdata(dev, cd);
691 error = sr_revalidate_disk(cd);
693 goto unregister_cdrom;
695 error = device_add_disk(&sdev->sdev_gendev, disk, NULL);
697 goto unregister_cdrom;
699 sdev_printk(KERN_DEBUG, sdev,
700 "Attached scsi CD-ROM %s\n", cd->cdi.name);
701 scsi_autopm_put_device(cd->device);
706 unregister_cdrom(&cd->cdi);
708 spin_lock(&sr_index_lock);
709 clear_bit(minor, sr_index_bits);
710 spin_unlock(&sr_index_lock);
713 mutex_destroy(&cd->lock);
717 scsi_autopm_put_device(sdev);
722 static int get_sectorsize(struct scsi_cd *cd)
724 struct request_queue *q = cd->device->request_queue;
725 static const u8 cmd[10] = { READ_CAPACITY };
726 unsigned char buffer[8] = { };
727 struct queue_limits lim;
730 struct scsi_failure failure_defs[] = {
732 .result = SCMD_FAILURE_RESULT_ANY,
737 struct scsi_failures failures = {
738 .failure_definitions = failure_defs,
740 const struct scsi_exec_args exec_args = {
741 .failures = &failures,
744 /* Do the command and wait.. */
745 err = scsi_execute_cmd(cd->device, cmd, REQ_OP_DRV_IN, buffer,
746 sizeof(buffer), SR_TIMEOUT, MAX_RETRIES,
749 cd->capacity = 0x1fffff;
750 sector_size = 2048; /* A guess, just in case */
754 cd->capacity = 1 + get_unaligned_be32(&buffer[0]);
756 * READ_CAPACITY doesn't return the correct size on
757 * certain UDF media. If last_written is larger, use
760 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
762 if (!cdrom_get_last_written(&cd->cdi, &last_written))
763 cd->capacity = max_t(long, cd->capacity, last_written);
765 sector_size = get_unaligned_be32(&buffer[4]);
766 switch (sector_size) {
768 * HP 4020i CD-Recorder reports 2340 byte sectors
769 * Philips CD-Writers report 2352 byte sectors
771 * Use 2k sectors for them..
784 sr_printk(KERN_INFO, cd,
785 "unsupported sector size %d.", sector_size);
789 cd->device->sector_size = sector_size;
792 * Add this so that we have the ability to correctly gauge
793 * what the device is capable of.
795 set_capacity(cd->disk, cd->capacity);
798 lim = queue_limits_start_update(q);
799 lim.logical_block_size = sector_size;
800 blk_mq_freeze_queue(q);
801 err = queue_limits_commit_update(q, &lim);
802 blk_mq_unfreeze_queue(q);
806 static int get_capabilities(struct scsi_cd *cd)
808 unsigned char *buffer;
809 struct scsi_mode_data data;
810 struct scsi_sense_hdr sshdr;
811 unsigned int ms_len = 128;
814 static const char *loadmech[] =
827 /* allocate transfer buffer */
828 buffer = kmalloc(512, GFP_KERNEL);
830 sr_printk(KERN_ERR, cd, "out of memory.\n");
834 /* eat unit attentions */
835 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
837 /* ask for mode page 0x2a */
838 rc = scsi_mode_sense(cd->device, 0, 0x2a, 0, buffer, ms_len,
839 SR_TIMEOUT, 3, &data, NULL);
841 if (rc < 0 || data.length > ms_len ||
842 data.header_length + data.block_descriptor_length > data.length) {
843 /* failed, drive doesn't have capabilities mode page */
845 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
846 CDC_DVD | CDC_DVD_RAM |
847 CDC_SELECT_DISC | CDC_SELECT_SPEED |
848 CDC_MRW | CDC_MRW_W | CDC_RAM);
850 sr_printk(KERN_INFO, cd, "scsi-1 drive");
854 n = data.header_length + data.block_descriptor_length;
855 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176;
856 cd->readcd_known = 1;
857 cd->readcd_cdda = buffer[n + 5] & 0x01;
858 /* print some capability bits */
859 sr_printk(KERN_INFO, cd,
860 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
861 get_unaligned_be16(&buffer[n + 14]) / 176,
863 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
864 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
865 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
866 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
867 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
868 loadmech[buffer[n + 6] >> 5]);
869 if ((buffer[n + 6] >> 5) == 0)
870 /* caddy drives can't close tray... */
871 cd->cdi.mask |= CDC_CLOSE_TRAY;
872 if ((buffer[n + 2] & 0x8) == 0)
873 /* not a DVD drive */
874 cd->cdi.mask |= CDC_DVD;
875 if ((buffer[n + 3] & 0x20) == 0)
876 /* can't write DVD-RAM media */
877 cd->cdi.mask |= CDC_DVD_RAM;
878 if ((buffer[n + 3] & 0x10) == 0)
879 /* can't write DVD-R media */
880 cd->cdi.mask |= CDC_DVD_R;
881 if ((buffer[n + 3] & 0x2) == 0)
882 /* can't write CD-RW media */
883 cd->cdi.mask |= CDC_CD_RW;
884 if ((buffer[n + 3] & 0x1) == 0)
885 /* can't write CD-R media */
886 cd->cdi.mask |= CDC_CD_R;
887 if ((buffer[n + 6] & 0x8) == 0)
889 cd->cdi.mask |= CDC_OPEN_TRAY;
891 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
892 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
894 cdrom_number_of_slots(&cd->cdi);
895 if (cd->cdi.capacity <= 1)
897 cd->cdi.mask |= CDC_SELECT_DISC;
898 /*else I don't think it can close its tray
899 cd->cdi.mask |= CDC_CLOSE_TRAY; */
902 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
904 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
905 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
914 * sr_packet() is the entry point for the generic commands generated
915 * by the Uniform CD-ROM layer.
917 static int sr_packet(struct cdrom_device_info *cdi,
918 struct packet_command *cgc)
920 struct scsi_cd *cd = cdi->handle;
921 struct scsi_device *sdev = cd->device;
923 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
924 return -EDRIVE_CANT_DO_THIS;
926 if (cgc->timeout <= 0)
927 cgc->timeout = IOCTL_TIMEOUT;
929 sr_do_ioctl(cd, cgc);
934 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
935 u32 lba, u32 nr, u8 *last_sense)
937 struct gendisk *disk = cdi->disk;
938 u32 len = nr * CD_FRAMESIZE_RAW;
939 struct scsi_cmnd *scmd;
944 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0);
947 scmd = blk_mq_rq_to_pdu(rq);
949 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL);
951 goto out_put_request;
953 scmd->cmnd[0] = GPCMD_READ_CD;
954 scmd->cmnd[1] = 1 << 2;
955 scmd->cmnd[2] = (lba >> 24) & 0xff;
956 scmd->cmnd[3] = (lba >> 16) & 0xff;
957 scmd->cmnd[4] = (lba >> 8) & 0xff;
958 scmd->cmnd[5] = lba & 0xff;
959 scmd->cmnd[6] = (nr >> 16) & 0xff;
960 scmd->cmnd[7] = (nr >> 8) & 0xff;
961 scmd->cmnd[8] = nr & 0xff;
962 scmd->cmnd[9] = 0xf8;
964 rq->timeout = 60 * HZ;
967 blk_execute_rq(rq, false);
969 struct scsi_sense_hdr sshdr;
971 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,
973 *last_sense = sshdr.sense_key;
977 if (blk_rq_unmap_user(bio))
980 blk_mq_free_request(rq);
984 static int sr_remove(struct device *dev)
986 struct scsi_cd *cd = dev_get_drvdata(dev);
988 scsi_autopm_get_device(cd->device);
990 del_gendisk(cd->disk);
996 static int __init init_sr(void)
1000 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
1003 rc = scsi_register_driver(&sr_template.gendrv);
1005 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1010 static void __exit exit_sr(void)
1012 scsi_unregister_driver(&sr_template.gendrv);
1013 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1016 module_init(init_sr);
1017 module_exit(exit_sr);
1018 MODULE_LICENSE("GPL");