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 <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;
173 const struct scsi_exec_args exec_args = {
178 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buf, sizeof(buf),
179 SR_TIMEOUT, MAX_RETRIES, &exec_args);
180 if (result > 0 && scsi_sense_valid(&sshdr) &&
181 sshdr.sense_key == UNIT_ATTENTION)
182 return DISK_EVENT_MEDIA_CHANGE;
184 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
187 if (eh->nea || eh->notification_class != 0x4)
190 if (med->media_event_code == 1)
191 return DISK_EVENT_EJECT_REQUEST;
192 else if (med->media_event_code == 2)
193 return DISK_EVENT_MEDIA_CHANGE;
194 else if (med->media_event_code == 3)
195 return DISK_EVENT_MEDIA_CHANGE;
200 * This function checks to see if the media has been changed or eject
201 * button has been pressed. It is possible that we have already
202 * sensed a change, or the drive may have sensed one and not yet
203 * reported it. The past events are accumulated in sdev->changed and
204 * returned together with the current state.
206 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
207 unsigned int clearing, int slot)
209 struct scsi_cd *cd = cdi->handle;
211 struct scsi_sense_hdr sshdr;
215 /* no changer support */
216 if (CDSL_CURRENT != slot)
219 events = sr_get_events(cd->device);
220 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
223 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
224 * for several times in a row. We rely on TUR only for this likely
225 * broken device, to prevent generating incorrect media changed
226 * events for every open().
228 if (cd->ignore_get_event) {
229 events &= ~DISK_EVENT_MEDIA_CHANGE;
234 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
235 * is being cleared. Note that there are devices which hang
236 * if asked to execute TUR repeatedly.
238 if (cd->device->changed) {
239 events |= DISK_EVENT_MEDIA_CHANGE;
240 cd->device->changed = 0;
241 cd->tur_changed = true;
244 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
247 /* let's see whether the media is there with TUR */
248 last_present = cd->media_present;
249 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
252 * Media is considered to be present if TUR succeeds or fails with
253 * sense data indicating something other than media-not-present
256 cd->media_present = scsi_status_is_good(ret) ||
257 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
259 if (last_present != cd->media_present)
260 cd->device->changed = 1;
262 if (cd->device->changed) {
263 events |= DISK_EVENT_MEDIA_CHANGE;
264 cd->device->changed = 0;
265 cd->tur_changed = true;
268 if (cd->ignore_get_event)
271 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
272 if (!cd->tur_changed) {
273 if (cd->get_event_changed) {
274 if (cd->tur_mismatch++ > 8) {
275 sr_printk(KERN_WARNING, cd,
276 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
277 cd->ignore_get_event = true;
280 cd->tur_mismatch = 0;
283 cd->tur_changed = false;
284 cd->get_event_changed = false;
290 * sr_done is the interrupt routine for the device driver.
292 * It will be notified on the end of a SCSI read / write, and will take one
293 * of several actions based on success or failure.
295 static int sr_done(struct scsi_cmnd *SCpnt)
297 int result = SCpnt->result;
298 int this_count = scsi_bufflen(SCpnt);
299 int good_bytes = (result == 0 ? this_count : 0);
300 int block_sectors = 0;
302 struct request *rq = scsi_cmd_to_rq(SCpnt);
303 struct scsi_cd *cd = scsi_cd(rq->q->disk);
306 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
310 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
311 * success. Since this is a relatively rare error condition, no
312 * care is taken to avoid unnecessary additional work such as
313 * memcpy's that could be avoided.
315 if (scsi_status_is_check_condition(result) &&
316 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
317 switch (SCpnt->sense_buffer[2]) {
319 case VOLUME_OVERFLOW:
320 case ILLEGAL_REQUEST:
321 if (!(SCpnt->sense_buffer[0] & 0x90))
324 get_unaligned_be32(&SCpnt->sense_buffer[3]);
326 block_sectors = bio_sectors(rq->bio);
327 if (block_sectors < 4)
329 if (cd->device->sector_size == 2048)
331 error_sector &= ~(block_sectors - 1);
332 good_bytes = (error_sector - blk_rq_pos(rq)) << 9;
333 if (good_bytes < 0 || good_bytes >= this_count)
336 * The SCSI specification allows for the value
337 * returned by READ CAPACITY to be up to 75 2K
338 * sectors past the last readable block.
339 * Therefore, if we hit a medium error within the
340 * last 75 2K sectors, we decrease the saved size
343 if (error_sector < get_capacity(cd->disk) &&
344 cd->capacity - error_sector < 4 * 75)
345 set_capacity(cd->disk, error_sector);
348 case RECOVERED_ERROR:
349 good_bytes = this_count;
360 static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
362 int block = 0, this_count, s_size;
364 struct request *rq = scsi_cmd_to_rq(SCpnt);
367 ret = scsi_alloc_sgtables(SCpnt);
368 if (ret != BLK_STS_OK)
370 cd = scsi_cd(rq->q->disk);
372 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
373 "Doing sr request, block = %d\n", block));
375 if (!cd->device || !scsi_device_online(cd->device)) {
376 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
377 "Finishing %u sectors\n", blk_rq_sectors(rq)));
378 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
379 "Retry with 0x%p\n", SCpnt));
383 if (cd->device->changed) {
385 * quietly refuse to do anything to a changed disc until the
386 * changed bit has been reset
391 s_size = cd->device->sector_size;
392 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
393 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
397 switch (req_op(rq)) {
401 SCpnt->cmnd[0] = WRITE_10;
402 cd->cdi.media_written = 1;
405 SCpnt->cmnd[0] = READ_10;
408 blk_dump_rq_flags(rq, "Unknown sr command");
413 struct scatterlist *sg;
414 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
416 scsi_for_each_sg(SCpnt, sg, sg_count, i)
419 if (size != scsi_bufflen(SCpnt)) {
420 scmd_printk(KERN_ERR, SCpnt,
421 "mismatch count %d, bytes %d\n",
422 size, scsi_bufflen(SCpnt));
423 if (scsi_bufflen(SCpnt) > size)
424 SCpnt->sdb.length = size;
429 * request doesn't start on hw block boundary, add scatter pads
431 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
432 (scsi_bufflen(SCpnt) % s_size)) {
433 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
437 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
440 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
441 "%s %d/%u 512 byte blocks.\n",
442 (rq_data_dir(rq) == WRITE) ?
443 "writing" : "reading",
444 this_count, blk_rq_sectors(rq)));
447 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
449 if (this_count > 0xffff) {
451 SCpnt->sdb.length = this_count * s_size;
454 put_unaligned_be32(block, &SCpnt->cmnd[2]);
455 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
456 put_unaligned_be16(this_count, &SCpnt->cmnd[7]);
459 * We shouldn't disconnect in the middle of a sector, so with a dumb
460 * host adapter, it's safe to assume that we can at least transfer
461 * this many bytes between each connect / disconnect.
463 SCpnt->transfersize = cd->device->sector_size;
464 SCpnt->underflow = this_count << 9;
465 SCpnt->allowed = MAX_RETRIES;
469 * This indicates that the command is ready from our end to be queued.
473 scsi_free_sgtables(SCpnt);
474 return BLK_STS_IOERR;
477 static void sr_revalidate_disk(struct scsi_cd *cd)
479 struct scsi_sense_hdr sshdr;
481 /* if the unit is not ready, nothing more to do */
482 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
484 sr_cd_check(&cd->cdi);
488 static int sr_block_open(struct gendisk *disk, blk_mode_t mode)
490 struct scsi_cd *cd = scsi_cd(disk);
491 struct scsi_device *sdev = cd->device;
494 if (scsi_device_get(cd->device))
497 scsi_autopm_get_device(sdev);
498 if (disk_check_media_change(disk))
499 sr_revalidate_disk(cd);
501 mutex_lock(&cd->lock);
502 ret = cdrom_open(&cd->cdi, mode);
503 mutex_unlock(&cd->lock);
505 scsi_autopm_put_device(sdev);
507 scsi_device_put(cd->device);
511 static void sr_block_release(struct gendisk *disk)
513 struct scsi_cd *cd = scsi_cd(disk);
515 mutex_lock(&cd->lock);
516 cdrom_release(&cd->cdi);
517 mutex_unlock(&cd->lock);
519 scsi_device_put(cd->device);
522 static int sr_block_ioctl(struct block_device *bdev, blk_mode_t mode,
523 unsigned cmd, unsigned long arg)
525 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
526 struct scsi_device *sdev = cd->device;
527 void __user *argp = (void __user *)arg;
530 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
533 mutex_lock(&cd->lock);
535 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
536 (mode & BLK_OPEN_NDELAY));
540 scsi_autopm_get_device(sdev);
542 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) {
543 ret = cdrom_ioctl(&cd->cdi, bdev, cmd, arg);
547 ret = scsi_ioctl(sdev, mode & BLK_OPEN_WRITE, cmd, argp);
550 scsi_autopm_put_device(sdev);
552 mutex_unlock(&cd->lock);
556 static unsigned int sr_block_check_events(struct gendisk *disk,
557 unsigned int clearing)
559 struct scsi_cd *cd = disk->private_data;
561 if (atomic_read(&cd->device->disk_events_disable_depth))
563 return cdrom_check_events(&cd->cdi, clearing);
566 static void sr_free_disk(struct gendisk *disk)
568 struct scsi_cd *cd = disk->private_data;
570 spin_lock(&sr_index_lock);
571 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
572 spin_unlock(&sr_index_lock);
574 unregister_cdrom(&cd->cdi);
575 mutex_destroy(&cd->lock);
579 static const struct block_device_operations sr_bdops =
581 .owner = THIS_MODULE,
582 .open = sr_block_open,
583 .release = sr_block_release,
584 .ioctl = sr_block_ioctl,
585 .compat_ioctl = blkdev_compat_ptr_ioctl,
586 .check_events = sr_block_check_events,
587 .free_disk = sr_free_disk,
590 static int sr_open(struct cdrom_device_info *cdi, int purpose)
592 struct scsi_cd *cd = cdi->handle;
593 struct scsi_device *sdev = cd->device;
596 * If the device is in error recovery, wait until it is done.
597 * If the device is offline, then disallow any access to it.
599 if (!scsi_block_when_processing_errors(sdev))
605 static void sr_release(struct cdrom_device_info *cdi)
609 static int sr_probe(struct device *dev)
611 struct scsi_device *sdev = to_scsi_device(dev);
612 struct gendisk *disk;
616 scsi_autopm_get_device(sdev);
618 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
622 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
626 disk = blk_mq_alloc_disk_for_queue(sdev->request_queue,
627 &sr_bio_compl_lkclass);
630 mutex_init(&cd->lock);
632 spin_lock(&sr_index_lock);
633 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
634 if (minor == SR_DISKS) {
635 spin_unlock(&sr_index_lock);
639 __set_bit(minor, sr_index_bits);
640 spin_unlock(&sr_index_lock);
642 disk->major = SCSI_CDROM_MAJOR;
643 disk->first_minor = minor;
645 sprintf(disk->disk_name, "sr%d", minor);
646 disk->fops = &sr_bdops;
647 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
648 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
649 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT |
650 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE;
652 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
656 cd->capacity = 0x1fffff;
657 cd->device->changed = 1; /* force recheck CD type */
658 cd->media_present = 1;
660 cd->readcd_known = 0;
663 cd->cdi.ops = &sr_dops;
666 cd->cdi.capacity = 1;
667 sprintf(cd->cdi.name, "sr%d", minor);
669 sdev->sector_size = 2048; /* A guess, just in case */
672 if (get_capabilities(cd))
676 set_capacity(disk, cd->capacity);
677 disk->private_data = cd;
679 if (register_cdrom(disk, &cd->cdi))
683 * Initialize block layer runtime PM stuffs before the
684 * periodic event checking request gets started in add_disk.
686 blk_pm_runtime_init(sdev->request_queue, dev);
688 dev_set_drvdata(dev, cd);
689 sr_revalidate_disk(cd);
691 error = device_add_disk(&sdev->sdev_gendev, disk, NULL);
693 goto unregister_cdrom;
695 sdev_printk(KERN_DEBUG, sdev,
696 "Attached scsi CD-ROM %s\n", cd->cdi.name);
697 scsi_autopm_put_device(cd->device);
702 unregister_cdrom(&cd->cdi);
704 spin_lock(&sr_index_lock);
705 clear_bit(minor, sr_index_bits);
706 spin_unlock(&sr_index_lock);
709 mutex_destroy(&cd->lock);
713 scsi_autopm_put_device(sdev);
718 static void get_sectorsize(struct scsi_cd *cd)
720 static const u8 cmd[10] = { READ_CAPACITY };
721 unsigned char buffer[8] = { };
724 struct request_queue *queue;
725 struct scsi_failure failure_defs[] = {
727 .result = SCMD_FAILURE_RESULT_ANY,
732 struct scsi_failures failures = {
733 .failure_definitions = failure_defs,
735 const struct scsi_exec_args exec_args = {
736 .failures = &failures,
739 /* Do the command and wait.. */
740 the_result = scsi_execute_cmd(cd->device, cmd, REQ_OP_DRV_IN, buffer,
741 sizeof(buffer), SR_TIMEOUT, MAX_RETRIES,
744 cd->capacity = 0x1fffff;
745 sector_size = 2048; /* A guess, just in case */
749 cd->capacity = 1 + get_unaligned_be32(&buffer[0]);
751 * READ_CAPACITY doesn't return the correct size on
752 * certain UDF media. If last_written is larger, use
755 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
757 if (!cdrom_get_last_written(&cd->cdi, &last_written))
758 cd->capacity = max_t(long, cd->capacity, last_written);
760 sector_size = get_unaligned_be32(&buffer[4]);
761 switch (sector_size) {
763 * HP 4020i CD-Recorder reports 2340 byte sectors
764 * Philips CD-Writers report 2352 byte sectors
766 * Use 2k sectors for them..
779 sr_printk(KERN_INFO, cd,
780 "unsupported sector size %d.", sector_size);
784 cd->device->sector_size = sector_size;
787 * Add this so that we have the ability to correctly gauge
788 * what the device is capable of.
790 set_capacity(cd->disk, cd->capacity);
793 queue = cd->device->request_queue;
794 blk_queue_logical_block_size(queue, sector_size);
799 static int get_capabilities(struct scsi_cd *cd)
801 unsigned char *buffer;
802 struct scsi_mode_data data;
803 struct scsi_sense_hdr sshdr;
804 unsigned int ms_len = 128;
807 static const char *loadmech[] =
820 /* allocate transfer buffer */
821 buffer = kmalloc(512, GFP_KERNEL);
823 sr_printk(KERN_ERR, cd, "out of memory.\n");
827 /* eat unit attentions */
828 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
830 /* ask for mode page 0x2a */
831 rc = scsi_mode_sense(cd->device, 0, 0x2a, 0, buffer, ms_len,
832 SR_TIMEOUT, 3, &data, NULL);
834 if (rc < 0 || data.length > ms_len ||
835 data.header_length + data.block_descriptor_length > data.length) {
836 /* failed, drive doesn't have capabilities mode page */
838 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
839 CDC_DVD | CDC_DVD_RAM |
840 CDC_SELECT_DISC | CDC_SELECT_SPEED |
841 CDC_MRW | CDC_MRW_W | CDC_RAM);
843 sr_printk(KERN_INFO, cd, "scsi-1 drive");
847 n = data.header_length + data.block_descriptor_length;
848 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176;
849 cd->readcd_known = 1;
850 cd->readcd_cdda = buffer[n + 5] & 0x01;
851 /* print some capability bits */
852 sr_printk(KERN_INFO, cd,
853 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
854 get_unaligned_be16(&buffer[n + 14]) / 176,
856 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
857 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
858 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
859 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
860 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
861 loadmech[buffer[n + 6] >> 5]);
862 if ((buffer[n + 6] >> 5) == 0)
863 /* caddy drives can't close tray... */
864 cd->cdi.mask |= CDC_CLOSE_TRAY;
865 if ((buffer[n + 2] & 0x8) == 0)
866 /* not a DVD drive */
867 cd->cdi.mask |= CDC_DVD;
868 if ((buffer[n + 3] & 0x20) == 0)
869 /* can't write DVD-RAM media */
870 cd->cdi.mask |= CDC_DVD_RAM;
871 if ((buffer[n + 3] & 0x10) == 0)
872 /* can't write DVD-R media */
873 cd->cdi.mask |= CDC_DVD_R;
874 if ((buffer[n + 3] & 0x2) == 0)
875 /* can't write CD-RW media */
876 cd->cdi.mask |= CDC_CD_RW;
877 if ((buffer[n + 3] & 0x1) == 0)
878 /* can't write CD-R media */
879 cd->cdi.mask |= CDC_CD_R;
880 if ((buffer[n + 6] & 0x8) == 0)
882 cd->cdi.mask |= CDC_OPEN_TRAY;
884 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
885 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
887 cdrom_number_of_slots(&cd->cdi);
888 if (cd->cdi.capacity <= 1)
890 cd->cdi.mask |= CDC_SELECT_DISC;
891 /*else I don't think it can close its tray
892 cd->cdi.mask |= CDC_CLOSE_TRAY; */
895 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
897 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
898 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
907 * sr_packet() is the entry point for the generic commands generated
908 * by the Uniform CD-ROM layer.
910 static int sr_packet(struct cdrom_device_info *cdi,
911 struct packet_command *cgc)
913 struct scsi_cd *cd = cdi->handle;
914 struct scsi_device *sdev = cd->device;
916 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
917 return -EDRIVE_CANT_DO_THIS;
919 if (cgc->timeout <= 0)
920 cgc->timeout = IOCTL_TIMEOUT;
922 sr_do_ioctl(cd, cgc);
927 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
928 u32 lba, u32 nr, u8 *last_sense)
930 struct gendisk *disk = cdi->disk;
931 u32 len = nr * CD_FRAMESIZE_RAW;
932 struct scsi_cmnd *scmd;
937 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0);
940 scmd = blk_mq_rq_to_pdu(rq);
942 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL);
944 goto out_put_request;
946 scmd->cmnd[0] = GPCMD_READ_CD;
947 scmd->cmnd[1] = 1 << 2;
948 scmd->cmnd[2] = (lba >> 24) & 0xff;
949 scmd->cmnd[3] = (lba >> 16) & 0xff;
950 scmd->cmnd[4] = (lba >> 8) & 0xff;
951 scmd->cmnd[5] = lba & 0xff;
952 scmd->cmnd[6] = (nr >> 16) & 0xff;
953 scmd->cmnd[7] = (nr >> 8) & 0xff;
954 scmd->cmnd[8] = nr & 0xff;
955 scmd->cmnd[9] = 0xf8;
957 rq->timeout = 60 * HZ;
960 blk_execute_rq(rq, false);
962 struct scsi_sense_hdr sshdr;
964 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,
966 *last_sense = sshdr.sense_key;
970 if (blk_rq_unmap_user(bio))
973 blk_mq_free_request(rq);
977 static int sr_remove(struct device *dev)
979 struct scsi_cd *cd = dev_get_drvdata(dev);
981 scsi_autopm_get_device(cd->device);
983 del_gendisk(cd->disk);
989 static int __init init_sr(void)
993 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
996 rc = scsi_register_driver(&sr_template.gendrv);
998 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1003 static void __exit exit_sr(void)
1005 scsi_unregister_driver(&sr_template.gendrv);
1006 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1009 module_init(init_sr);
1010 module_exit(exit_sr);
1011 MODULE_LICENSE("GPL");