Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sr.c Copyright (C) 1992 David Giller
4 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5 *
6 * adapted from:
7 * sd.c Copyright (C) 1992 Drew Eckhardt
8 * Linux scsi disk driver by
9 * Drew Eckhardt <drew@colorado.edu>
10 *
11 * Modified by Eric Youngdale ericy@andante.org to
12 * add scatter-gather, multiple outstanding request, and other
13 * enhancements.
14 *
15 * Modified by Eric Youngdale eric@andante.org to support loadable
16 * low-level scsi drivers.
17 *
18 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
19 * provide auto-eject.
20 *
21 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
22 * generic cdrom interface
23 *
24 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
25 * interface, capabilities probe additions, ioctl cleanups, etc.
26 *
27 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
28 *
29 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
30 * transparently and lose the GHOST hack
31 *
32 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
33 * check resource allocation in sr_init and some cleanups
34 */
35
36#include <linux/module.h>
37#include <linux/fs.h>
38#include <linux/kernel.h>
39#include <linux/mm.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>
54
55#include <linux/unaligned.h>
56
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 */
65
66#include "scsi_logging.h"
67#include "sr.h"
68
69
70MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
71MODULE_LICENSE("GPL");
72MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
73MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
74MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
75
76#define SR_DISKS 256
77
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)
84
85static int sr_probe(struct scsi_device *);
86static void sr_remove(struct scsi_device *);
87static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt);
88static int sr_done(struct scsi_cmnd *);
89static int sr_runtime_suspend(struct device *dev);
90
91static const struct dev_pm_ops sr_pm_ops = {
92 .runtime_suspend = sr_runtime_suspend,
93};
94
95static struct scsi_driver sr_template = {
96 .probe = sr_probe,
97 .remove = sr_remove,
98 .gendrv = {
99 .name = "sr",
100 .pm = &sr_pm_ops,
101 },
102 .init_command = sr_init_command,
103 .done = sr_done,
104};
105
106static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
107static DEFINE_SPINLOCK(sr_index_lock);
108
109static struct lock_class_key sr_bio_compl_lkclass;
110
111static int sr_open(struct cdrom_device_info *, int);
112static void sr_release(struct cdrom_device_info *);
113
114static int get_sectorsize(struct scsi_cd *);
115static int get_capabilities(struct scsi_cd *);
116
117static unsigned int sr_check_events(struct cdrom_device_info *cdi,
118 unsigned int clearing, int slot);
119static int sr_packet(struct cdrom_device_info *, struct packet_command *);
120static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
121 u32 lba, u32 nr, u8 *last_sense);
122
123static const struct cdrom_device_ops sr_dops = {
124 .open = sr_open,
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,
133 .reset = sr_reset,
134 .audio_ioctl = sr_audio_ioctl,
135 .generic_packet = sr_packet,
136 .read_cdda_bpc = sr_read_cdda_bpc,
137 .capability = SR_CAPABILITIES,
138};
139
140static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
141{
142 return disk->private_data;
143}
144
145static int sr_runtime_suspend(struct device *dev)
146{
147 struct scsi_cd *cd = dev_get_drvdata(dev);
148
149 if (!cd) /* E.g.: runtime suspend following sr_remove() */
150 return 0;
151
152 if (cd->media_present)
153 return -EBUSY;
154 else
155 return 0;
156}
157
158static unsigned int sr_get_events(struct scsi_device *sdev)
159{
160 u8 buf[8];
161 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
162 1, /* polled */
163 0, 0, /* reserved */
164 1 << 4, /* notification class: media */
165 0, 0, /* reserved */
166 0, sizeof(buf), /* allocation length */
167 0, /* control */
168 };
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 = {
173 .sshdr = &sshdr,
174 };
175 int result;
176
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;
182
183 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
184 return 0;
185
186 if (eh->nea || eh->notification_class != 0x4)
187 return 0;
188
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;
195 return 0;
196}
197
198/*
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.
204 */
205static unsigned int sr_check_events(struct cdrom_device_info *cdi,
206 unsigned int clearing, int slot)
207{
208 struct scsi_cd *cd = cdi->handle;
209 bool last_present;
210 struct scsi_sense_hdr sshdr;
211 unsigned int events;
212 int ret;
213
214 /* no changer support */
215 if (CDSL_CURRENT != slot)
216 return 0;
217
218 events = sr_get_events(cd->device);
219 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
220
221 /*
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().
226 */
227 if (cd->ignore_get_event) {
228 events &= ~DISK_EVENT_MEDIA_CHANGE;
229 goto do_tur;
230 }
231
232 /*
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.
236 */
237 if (cd->device->changed) {
238 events |= DISK_EVENT_MEDIA_CHANGE;
239 cd->device->changed = 0;
240 cd->tur_changed = true;
241 }
242
243 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
244 return events;
245do_tur:
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);
249
250 /*
251 * Media is considered to be present if TUR succeeds or fails with
252 * sense data indicating something other than media-not-present
253 * (ASC 0x3a).
254 */
255 cd->media_present = scsi_status_is_good(ret) ||
256 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
257
258 if (last_present != cd->media_present)
259 cd->device->changed = 1;
260
261 if (cd->device->changed) {
262 events |= DISK_EVENT_MEDIA_CHANGE;
263 cd->device->changed = 0;
264 cd->tur_changed = true;
265 }
266
267 if (cd->ignore_get_event)
268 return events;
269
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;
277 }
278 } else {
279 cd->tur_mismatch = 0;
280 }
281 }
282 cd->tur_changed = false;
283 cd->get_event_changed = false;
284
285 return events;
286}
287
288/*
289 * sr_done is the interrupt routine for the device driver.
290 *
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.
293 */
294static int sr_done(struct scsi_cmnd *SCpnt)
295{
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;
300 long error_sector;
301 struct request *rq = scsi_cmd_to_rq(SCpnt);
302 struct scsi_cd *cd = scsi_cd(rq->q->disk);
303
304#ifdef DEBUG
305 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
306#endif
307
308 /*
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.
313 */
314 if (scsi_status_is_check_condition(result) &&
315 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
316 switch (SCpnt->sense_buffer[2]) {
317 case MEDIUM_ERROR:
318 case VOLUME_OVERFLOW:
319 case ILLEGAL_REQUEST:
320 if (!(SCpnt->sense_buffer[0] & 0x90))
321 break;
322 error_sector =
323 get_unaligned_be32(&SCpnt->sense_buffer[3]);
324 if (rq->bio != NULL)
325 block_sectors = bio_sectors(rq->bio);
326 if (block_sectors < 4)
327 block_sectors = 4;
328 if (cd->device->sector_size == 2048)
329 error_sector <<= 2;
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)
333 good_bytes = 0;
334 /*
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
340 * value.
341 */
342 if (error_sector < get_capacity(cd->disk) &&
343 cd->capacity - error_sector < 4 * 75)
344 set_capacity(cd->disk, error_sector);
345 break;
346
347 case RECOVERED_ERROR:
348 good_bytes = this_count;
349 break;
350
351 default:
352 break;
353 }
354 }
355
356 return good_bytes;
357}
358
359static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
360{
361 int block = 0, this_count, s_size;
362 struct scsi_cd *cd;
363 struct request *rq = scsi_cmd_to_rq(SCpnt);
364 blk_status_t ret;
365
366 ret = scsi_alloc_sgtables(SCpnt);
367 if (ret != BLK_STS_OK)
368 return ret;
369 cd = scsi_cd(rq->q->disk);
370
371 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
372 "Doing sr request, block = %d\n", block));
373
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));
379 goto out;
380 }
381
382 if (cd->device->changed) {
383 /*
384 * quietly refuse to do anything to a changed disc until the
385 * changed bit has been reset
386 */
387 goto out;
388 }
389
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);
393 goto out;
394 }
395
396 switch (req_op(rq)) {
397 case REQ_OP_WRITE:
398 if (get_disk_ro(cd->disk))
399 goto out;
400 SCpnt->cmnd[0] = WRITE_10;
401 cd->cdi.media_written = 1;
402 break;
403 case REQ_OP_READ:
404 SCpnt->cmnd[0] = READ_10;
405 break;
406 default:
407 blk_dump_rq_flags(rq, "Unknown sr command");
408 goto out;
409 }
410
411 {
412 struct scatterlist *sg;
413 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
414
415 scsi_for_each_sg(SCpnt, sg, sg_count, i)
416 size += sg->length;
417
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;
424 }
425 }
426
427 /*
428 * request doesn't start on hw block boundary, add scatter pads
429 */
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");
433 goto out;
434 }
435
436 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
437
438
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)));
444
445 SCpnt->cmnd[1] = 0;
446 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
447
448 if (this_count > 0xffff) {
449 this_count = 0xffff;
450 SCpnt->sdb.length = this_count * s_size;
451 }
452
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]);
456
457 /*
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.
461 */
462 SCpnt->transfersize = cd->device->sector_size;
463 SCpnt->underflow = this_count << 9;
464 SCpnt->allowed = MAX_RETRIES;
465 SCpnt->cmd_len = 10;
466
467 /*
468 * This indicates that the command is ready from our end to be queued.
469 */
470 return BLK_STS_OK;
471 out:
472 scsi_free_sgtables(SCpnt);
473 return BLK_STS_IOERR;
474}
475
476static int sr_revalidate_disk(struct scsi_cd *cd)
477{
478 struct request_queue *q = cd->device->request_queue;
479 struct scsi_sense_hdr sshdr;
480 struct queue_limits lim;
481 int sector_size;
482
483 /* if the unit is not ready, nothing more to do */
484 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
485 return 0;
486 sr_cd_check(&cd->cdi);
487 sector_size = get_sectorsize(cd);
488
489 lim = queue_limits_start_update(q);
490 lim.logical_block_size = sector_size;
491 lim.features |= BLK_FEAT_ROTATIONAL;
492 return queue_limits_commit_update_frozen(q, &lim);
493}
494
495static int sr_block_open(struct gendisk *disk, blk_mode_t mode)
496{
497 struct scsi_cd *cd = scsi_cd(disk);
498 struct scsi_device *sdev = cd->device;
499 int ret;
500
501 if (scsi_device_get(cd->device))
502 return -ENXIO;
503
504 scsi_autopm_get_device(sdev);
505 if (disk_check_media_change(disk)) {
506 ret = sr_revalidate_disk(cd);
507 if (ret)
508 goto out;
509 }
510
511 mutex_lock(&cd->lock);
512 ret = cdrom_open(&cd->cdi, mode);
513 mutex_unlock(&cd->lock);
514out:
515 scsi_autopm_put_device(sdev);
516 if (ret)
517 scsi_device_put(cd->device);
518 return ret;
519}
520
521static void sr_block_release(struct gendisk *disk)
522{
523 struct scsi_cd *cd = scsi_cd(disk);
524
525 mutex_lock(&cd->lock);
526 cdrom_release(&cd->cdi);
527 mutex_unlock(&cd->lock);
528
529 scsi_device_put(cd->device);
530}
531
532static int sr_block_ioctl(struct block_device *bdev, blk_mode_t mode,
533 unsigned cmd, unsigned long arg)
534{
535 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
536 struct scsi_device *sdev = cd->device;
537 void __user *argp = (void __user *)arg;
538 int ret;
539
540 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
541 return -ENOIOCTLCMD;
542
543 mutex_lock(&cd->lock);
544
545 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
546 (mode & BLK_OPEN_NDELAY));
547 if (ret)
548 goto out;
549
550 scsi_autopm_get_device(sdev);
551
552 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) {
553 ret = cdrom_ioctl(&cd->cdi, bdev, cmd, arg);
554 if (ret != -ENOSYS)
555 goto put;
556 }
557 ret = scsi_ioctl(sdev, mode & BLK_OPEN_WRITE, cmd, argp);
558
559put:
560 scsi_autopm_put_device(sdev);
561out:
562 mutex_unlock(&cd->lock);
563 return ret;
564}
565
566static unsigned int sr_block_check_events(struct gendisk *disk,
567 unsigned int clearing)
568{
569 struct scsi_cd *cd = disk->private_data;
570
571 if (atomic_read(&cd->device->disk_events_disable_depth))
572 return 0;
573 return cdrom_check_events(&cd->cdi, clearing);
574}
575
576static void sr_free_disk(struct gendisk *disk)
577{
578 struct scsi_cd *cd = disk->private_data;
579
580 spin_lock(&sr_index_lock);
581 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
582 spin_unlock(&sr_index_lock);
583
584 unregister_cdrom(&cd->cdi);
585 mutex_destroy(&cd->lock);
586 kfree(cd);
587}
588
589static const struct block_device_operations sr_bdops =
590{
591 .owner = THIS_MODULE,
592 .open = sr_block_open,
593 .release = sr_block_release,
594 .ioctl = sr_block_ioctl,
595 .compat_ioctl = blkdev_compat_ptr_ioctl,
596 .check_events = sr_block_check_events,
597 .free_disk = sr_free_disk,
598};
599
600static int sr_open(struct cdrom_device_info *cdi, int purpose)
601{
602 struct scsi_cd *cd = cdi->handle;
603 struct scsi_device *sdev = cd->device;
604
605 /*
606 * If the device is in error recovery, wait until it is done.
607 * If the device is offline, then disallow any access to it.
608 */
609 if (!scsi_block_when_processing_errors(sdev))
610 return -ENXIO;
611
612 return 0;
613}
614
615static void sr_release(struct cdrom_device_info *cdi)
616{
617}
618
619static int sr_probe(struct scsi_device *sdev)
620{
621 struct device *dev = &sdev->sdev_gendev;
622 struct gendisk *disk;
623 struct scsi_cd *cd;
624 int minor, error;
625
626 scsi_autopm_get_device(sdev);
627 error = -ENODEV;
628 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
629 goto fail;
630
631 error = -ENOMEM;
632 cd = kzalloc_obj(*cd);
633 if (!cd)
634 goto fail;
635
636 disk = blk_mq_alloc_disk_for_queue(sdev->request_queue,
637 &sr_bio_compl_lkclass);
638 if (!disk)
639 goto fail_free;
640 mutex_init(&cd->lock);
641
642 spin_lock(&sr_index_lock);
643 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
644 if (minor == SR_DISKS) {
645 spin_unlock(&sr_index_lock);
646 error = -EBUSY;
647 goto fail_put;
648 }
649 __set_bit(minor, sr_index_bits);
650 spin_unlock(&sr_index_lock);
651
652 disk->major = SCSI_CDROM_MAJOR;
653 disk->first_minor = minor;
654 disk->minors = 1;
655 sprintf(disk->disk_name, "sr%d", minor);
656 disk->fops = &sr_bdops;
657 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
658 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
659 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT |
660 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE;
661
662 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
663
664 cd->device = sdev;
665 cd->disk = disk;
666 cd->capacity = 0x1fffff;
667 cd->device->changed = 1; /* force recheck CD type */
668 cd->media_present = 1;
669 cd->use = 1;
670 cd->readcd_known = 0;
671 cd->readcd_cdda = 0;
672
673 cd->cdi.ops = &sr_dops;
674 cd->cdi.handle = cd;
675 cd->cdi.mask = 0;
676 cd->cdi.capacity = 1;
677 sprintf(cd->cdi.name, "sr%d", minor);
678
679 sdev->sector_size = 2048; /* A guess, just in case */
680
681 error = -ENOMEM;
682 if (get_capabilities(cd))
683 goto fail_minor;
684 cdrom_probe_write_features(&cd->cdi);
685 sr_vendor_init(cd);
686
687 set_capacity(disk, cd->capacity);
688 disk->private_data = cd;
689
690 if (register_cdrom(disk, &cd->cdi))
691 goto fail_minor;
692
693 /*
694 * Initialize block layer runtime PM stuffs before the
695 * periodic event checking request gets started in add_disk.
696 */
697 blk_pm_runtime_init(sdev->request_queue, dev);
698
699 dev_set_drvdata(dev, cd);
700 error = sr_revalidate_disk(cd);
701 if (error)
702 goto unregister_cdrom;
703
704 error = device_add_disk(&sdev->sdev_gendev, disk, NULL);
705 if (error)
706 goto unregister_cdrom;
707
708 sdev_printk(KERN_DEBUG, sdev,
709 "Attached scsi CD-ROM %s\n", cd->cdi.name);
710 scsi_autopm_put_device(cd->device);
711
712 return 0;
713
714unregister_cdrom:
715 unregister_cdrom(&cd->cdi);
716fail_minor:
717 spin_lock(&sr_index_lock);
718 clear_bit(minor, sr_index_bits);
719 spin_unlock(&sr_index_lock);
720fail_put:
721 put_disk(disk);
722 mutex_destroy(&cd->lock);
723fail_free:
724 kfree(cd);
725fail:
726 scsi_autopm_put_device(sdev);
727 return error;
728}
729
730
731static int get_sectorsize(struct scsi_cd *cd)
732{
733 static const u8 cmd[10] = { READ_CAPACITY };
734 unsigned char buffer[8] = { };
735 int err;
736 int sector_size;
737 struct scsi_failure failure_defs[] = {
738 {
739 .result = SCMD_FAILURE_RESULT_ANY,
740 .allowed = 3,
741 },
742 {}
743 };
744 struct scsi_failures failures = {
745 .failure_definitions = failure_defs,
746 };
747 const struct scsi_exec_args exec_args = {
748 .failures = &failures,
749 };
750
751 /* Do the command and wait.. */
752 err = scsi_execute_cmd(cd->device, cmd, REQ_OP_DRV_IN, buffer,
753 sizeof(buffer), SR_TIMEOUT, MAX_RETRIES,
754 &exec_args);
755 if (err) {
756 cd->capacity = 0x1fffff;
757 sector_size = 2048; /* A guess, just in case */
758 } else {
759 long last_written;
760
761 cd->capacity = 1 + get_unaligned_be32(&buffer[0]);
762 /*
763 * READ_CAPACITY doesn't return the correct size on
764 * certain UDF media. If last_written is larger, use
765 * it instead.
766 *
767 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
768 */
769 if (!cdrom_get_last_written(&cd->cdi, &last_written))
770 cd->capacity = max_t(long, cd->capacity, last_written);
771
772 sector_size = get_unaligned_be32(&buffer[4]);
773 switch (sector_size) {
774 /*
775 * HP 4020i CD-Recorder reports 2340 byte sectors
776 * Philips CD-Writers report 2352 byte sectors
777 *
778 * Use 2k sectors for them..
779 */
780 case 0:
781 case 2340:
782 case 2352:
783 sector_size = 2048;
784 fallthrough;
785 case 2048:
786 cd->capacity *= 4;
787 fallthrough;
788 case 512:
789 break;
790 default:
791 sr_printk(KERN_INFO, cd,
792 "unsupported sector size %d.", sector_size);
793 cd->capacity = 0;
794 }
795
796 cd->device->sector_size = sector_size;
797
798 /*
799 * Add this so that we have the ability to correctly gauge
800 * what the device is capable of.
801 */
802 set_capacity(cd->disk, cd->capacity);
803 }
804
805 return sector_size;
806}
807
808static int get_capabilities(struct scsi_cd *cd)
809{
810 unsigned char *buffer;
811 struct scsi_mode_data data;
812 struct scsi_sense_hdr sshdr;
813 unsigned int ms_len = 128;
814 int rc, n;
815
816 static const char *loadmech[] =
817 {
818 "caddy",
819 "tray",
820 "pop-up",
821 "",
822 "changer",
823 "cartridge changer",
824 "",
825 ""
826 };
827
828
829 /* allocate transfer buffer */
830 buffer = kmalloc(512, GFP_KERNEL);
831 if (!buffer) {
832 sr_printk(KERN_ERR, cd, "out of memory.\n");
833 return -ENOMEM;
834 }
835
836 /* eat unit attentions */
837 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
838
839 /* ask for mode page 0x2a */
840 rc = scsi_mode_sense(cd->device, 0, 0x2a, 0, buffer, ms_len,
841 SR_TIMEOUT, 3, &data, NULL);
842
843 if (rc < 0 || data.length > ms_len ||
844 data.header_length + data.block_descriptor_length > data.length) {
845 /* failed, drive doesn't have capabilities mode page */
846 cd->cdi.speed = 1;
847 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
848 CDC_DVD | CDC_DVD_RAM |
849 CDC_SELECT_DISC | CDC_SELECT_SPEED |
850 CDC_MRW | CDC_MRW_W | CDC_RAM);
851 kfree(buffer);
852 sr_printk(KERN_INFO, cd, "scsi-1 drive");
853 return 0;
854 }
855
856 n = data.header_length + data.block_descriptor_length;
857 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176;
858 cd->readcd_known = 1;
859 cd->readcd_cdda = buffer[n + 5] & 0x01;
860 /* print some capability bits */
861 sr_printk(KERN_INFO, cd,
862 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
863 get_unaligned_be16(&buffer[n + 14]) / 176,
864 cd->cdi.speed,
865 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
866 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
867 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
868 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
869 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
870 loadmech[buffer[n + 6] >> 5]);
871 if ((buffer[n + 6] >> 5) == 0)
872 /* caddy drives can't close tray... */
873 cd->cdi.mask |= CDC_CLOSE_TRAY;
874 if ((buffer[n + 2] & 0x8) == 0)
875 /* not a DVD drive */
876 cd->cdi.mask |= CDC_DVD;
877 if ((buffer[n + 3] & 0x20) == 0)
878 /* can't write DVD-RAM media */
879 cd->cdi.mask |= CDC_DVD_RAM;
880 if ((buffer[n + 3] & 0x10) == 0)
881 /* can't write DVD-R media */
882 cd->cdi.mask |= CDC_DVD_R;
883 if ((buffer[n + 3] & 0x2) == 0)
884 /* can't write CD-RW media */
885 cd->cdi.mask |= CDC_CD_RW;
886 if ((buffer[n + 3] & 0x1) == 0)
887 /* can't write CD-R media */
888 cd->cdi.mask |= CDC_CD_R;
889 if ((buffer[n + 6] & 0x8) == 0)
890 /* can't eject */
891 cd->cdi.mask |= CDC_OPEN_TRAY;
892
893 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
894 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
895 cd->cdi.capacity =
896 cdrom_number_of_slots(&cd->cdi);
897 if (cd->cdi.capacity <= 1)
898 /* not a changer */
899 cd->cdi.mask |= CDC_SELECT_DISC;
900 /*else I don't think it can close its tray
901 cd->cdi.mask |= CDC_CLOSE_TRAY; */
902
903 kfree(buffer);
904 return 0;
905}
906
907/*
908 * sr_packet() is the entry point for the generic commands generated
909 * by the Uniform CD-ROM layer.
910 */
911static int sr_packet(struct cdrom_device_info *cdi,
912 struct packet_command *cgc)
913{
914 struct scsi_cd *cd = cdi->handle;
915 struct scsi_device *sdev = cd->device;
916
917 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
918 return -EDRIVE_CANT_DO_THIS;
919
920 if (cgc->timeout <= 0)
921 cgc->timeout = IOCTL_TIMEOUT;
922
923 sr_do_ioctl(cd, cgc);
924
925 return cgc->stat;
926}
927
928static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
929 u32 lba, u32 nr, u8 *last_sense)
930{
931 struct gendisk *disk = cdi->disk;
932 u32 len = nr * CD_FRAMESIZE_RAW;
933 struct scsi_cmnd *scmd;
934 struct request *rq;
935 struct bio *bio;
936 int ret;
937
938 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0);
939 if (IS_ERR(rq))
940 return PTR_ERR(rq);
941 scmd = blk_mq_rq_to_pdu(rq);
942
943 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL);
944 if (ret)
945 goto out_put_request;
946
947 scmd->cmnd[0] = GPCMD_READ_CD;
948 scmd->cmnd[1] = 1 << 2;
949 scmd->cmnd[2] = (lba >> 24) & 0xff;
950 scmd->cmnd[3] = (lba >> 16) & 0xff;
951 scmd->cmnd[4] = (lba >> 8) & 0xff;
952 scmd->cmnd[5] = lba & 0xff;
953 scmd->cmnd[6] = (nr >> 16) & 0xff;
954 scmd->cmnd[7] = (nr >> 8) & 0xff;
955 scmd->cmnd[8] = nr & 0xff;
956 scmd->cmnd[9] = 0xf8;
957 scmd->cmd_len = 12;
958 rq->timeout = 60 * HZ;
959 bio = rq->bio;
960
961 blk_execute_rq(rq, false);
962 if (scmd->result) {
963 struct scsi_sense_hdr sshdr;
964
965 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,
966 &sshdr);
967 *last_sense = sshdr.sense_key;
968 ret = -EIO;
969 }
970
971 if (blk_rq_unmap_user(bio))
972 ret = -EFAULT;
973out_put_request:
974 blk_mq_free_request(rq);
975 return ret;
976}
977
978static void sr_remove(struct scsi_device *sdev)
979{
980 struct device *dev = &sdev->sdev_gendev;
981 struct scsi_cd *cd = dev_get_drvdata(dev);
982
983 scsi_autopm_get_device(cd->device);
984
985 del_gendisk(cd->disk);
986 put_disk(cd->disk);
987}
988
989static int __init init_sr(void)
990{
991 int rc;
992
993 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
994 if (rc)
995 return rc;
996 rc = scsi_register_driver(&sr_template);
997 if (rc)
998 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
999
1000 return rc;
1001}
1002
1003static void __exit exit_sr(void)
1004{
1005 scsi_unregister_driver(&sr_template);
1006 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1007}
1008
1009module_init(init_sr);
1010module_exit(exit_sr);
1011MODULE_LICENSE("GPL");