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 <asm/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
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);
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
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);
90
91 static const struct dev_pm_ops sr_pm_ops = {
92 .runtime_suspend = sr_runtime_suspend,
93 };
94
95 static struct scsi_driver sr_template = {
96 .gendrv = {
97 .name = "sr",
98 .probe = sr_probe,
99 .remove = sr_remove,
100 .pm = &sr_pm_ops,
101 },
102 .init_command = sr_init_command,
103 .done = sr_done,
104 };
105
106 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
107 static DEFINE_SPINLOCK(sr_index_lock);
108
109 static struct lock_class_key sr_bio_compl_lkclass;
110
111 static int sr_open(struct cdrom_device_info *, int);
112 static void sr_release(struct cdrom_device_info *);
113
114 static int get_sectorsize(struct scsi_cd *);
115 static int get_capabilities(struct scsi_cd *);
116
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);
122
123 static 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
scsi_cd(struct gendisk * disk)140 static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
141 {
142 return disk->private_data;
143 }
144
sr_runtime_suspend(struct device * dev)145 static 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
sr_get_events(struct scsi_device * sdev)158 static 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 */
sr_check_events(struct cdrom_device_info * cdi,unsigned int clearing,int slot)205 static 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;
245 do_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 */
sr_done(struct scsi_cmnd * SCpnt)294 static 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
sr_init_command(struct scsi_cmnd * SCpnt)359 static 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 (!cd->writeable)
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
sr_revalidate_disk(struct scsi_cd * cd)476 static int sr_revalidate_disk(struct scsi_cd *cd)
477 {
478 struct scsi_sense_hdr sshdr;
479
480 /* if the unit is not ready, nothing more to do */
481 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
482 return 0;
483 sr_cd_check(&cd->cdi);
484 return get_sectorsize(cd);
485 }
486
sr_block_open(struct gendisk * disk,blk_mode_t mode)487 static int sr_block_open(struct gendisk *disk, blk_mode_t mode)
488 {
489 struct scsi_cd *cd = scsi_cd(disk);
490 struct scsi_device *sdev = cd->device;
491 int ret;
492
493 if (scsi_device_get(cd->device))
494 return -ENXIO;
495
496 scsi_autopm_get_device(sdev);
497 if (disk_check_media_change(disk)) {
498 ret = sr_revalidate_disk(cd);
499 if (ret)
500 goto out;
501 }
502
503 mutex_lock(&cd->lock);
504 ret = cdrom_open(&cd->cdi, mode);
505 mutex_unlock(&cd->lock);
506 out:
507 scsi_autopm_put_device(sdev);
508 if (ret)
509 scsi_device_put(cd->device);
510 return ret;
511 }
512
sr_block_release(struct gendisk * disk)513 static void sr_block_release(struct gendisk *disk)
514 {
515 struct scsi_cd *cd = scsi_cd(disk);
516
517 mutex_lock(&cd->lock);
518 cdrom_release(&cd->cdi);
519 mutex_unlock(&cd->lock);
520
521 scsi_device_put(cd->device);
522 }
523
sr_block_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned cmd,unsigned long arg)524 static int sr_block_ioctl(struct block_device *bdev, blk_mode_t mode,
525 unsigned cmd, unsigned long arg)
526 {
527 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
528 struct scsi_device *sdev = cd->device;
529 void __user *argp = (void __user *)arg;
530 int ret;
531
532 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
533 return -ENOIOCTLCMD;
534
535 mutex_lock(&cd->lock);
536
537 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
538 (mode & BLK_OPEN_NDELAY));
539 if (ret)
540 goto out;
541
542 scsi_autopm_get_device(sdev);
543
544 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) {
545 ret = cdrom_ioctl(&cd->cdi, bdev, cmd, arg);
546 if (ret != -ENOSYS)
547 goto put;
548 }
549 ret = scsi_ioctl(sdev, mode & BLK_OPEN_WRITE, cmd, argp);
550
551 put:
552 scsi_autopm_put_device(sdev);
553 out:
554 mutex_unlock(&cd->lock);
555 return ret;
556 }
557
sr_block_check_events(struct gendisk * disk,unsigned int clearing)558 static unsigned int sr_block_check_events(struct gendisk *disk,
559 unsigned int clearing)
560 {
561 struct scsi_cd *cd = disk->private_data;
562
563 if (atomic_read(&cd->device->disk_events_disable_depth))
564 return 0;
565 return cdrom_check_events(&cd->cdi, clearing);
566 }
567
sr_free_disk(struct gendisk * disk)568 static void sr_free_disk(struct gendisk *disk)
569 {
570 struct scsi_cd *cd = disk->private_data;
571
572 spin_lock(&sr_index_lock);
573 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
574 spin_unlock(&sr_index_lock);
575
576 unregister_cdrom(&cd->cdi);
577 mutex_destroy(&cd->lock);
578 kfree(cd);
579 }
580
581 static const struct block_device_operations sr_bdops =
582 {
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,
590 };
591
sr_open(struct cdrom_device_info * cdi,int purpose)592 static int sr_open(struct cdrom_device_info *cdi, int purpose)
593 {
594 struct scsi_cd *cd = cdi->handle;
595 struct scsi_device *sdev = cd->device;
596
597 /*
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.
600 */
601 if (!scsi_block_when_processing_errors(sdev))
602 return -ENXIO;
603
604 return 0;
605 }
606
sr_release(struct cdrom_device_info * cdi)607 static void sr_release(struct cdrom_device_info *cdi)
608 {
609 }
610
sr_probe(struct device * dev)611 static int sr_probe(struct device *dev)
612 {
613 struct scsi_device *sdev = to_scsi_device(dev);
614 struct gendisk *disk;
615 struct scsi_cd *cd;
616 int minor, error;
617
618 scsi_autopm_get_device(sdev);
619 error = -ENODEV;
620 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
621 goto fail;
622
623 error = -ENOMEM;
624 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
625 if (!cd)
626 goto fail;
627
628 disk = blk_mq_alloc_disk_for_queue(sdev->request_queue,
629 &sr_bio_compl_lkclass);
630 if (!disk)
631 goto fail_free;
632 mutex_init(&cd->lock);
633
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);
638 error = -EBUSY;
639 goto fail_put;
640 }
641 __set_bit(minor, sr_index_bits);
642 spin_unlock(&sr_index_lock);
643
644 disk->major = SCSI_CDROM_MAJOR;
645 disk->first_minor = minor;
646 disk->minors = 1;
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;
653
654 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
655
656 cd->device = sdev;
657 cd->disk = disk;
658 cd->capacity = 0x1fffff;
659 cd->device->changed = 1; /* force recheck CD type */
660 cd->media_present = 1;
661 cd->use = 1;
662 cd->readcd_known = 0;
663 cd->readcd_cdda = 0;
664
665 cd->cdi.ops = &sr_dops;
666 cd->cdi.handle = cd;
667 cd->cdi.mask = 0;
668 cd->cdi.capacity = 1;
669 sprintf(cd->cdi.name, "sr%d", minor);
670
671 sdev->sector_size = 2048; /* A guess, just in case */
672
673 error = -ENOMEM;
674 if (get_capabilities(cd))
675 goto fail_minor;
676 sr_vendor_init(cd);
677
678 set_capacity(disk, cd->capacity);
679 disk->private_data = cd;
680
681 if (register_cdrom(disk, &cd->cdi))
682 goto fail_minor;
683
684 /*
685 * Initialize block layer runtime PM stuffs before the
686 * periodic event checking request gets started in add_disk.
687 */
688 blk_pm_runtime_init(sdev->request_queue, dev);
689
690 dev_set_drvdata(dev, cd);
691 error = sr_revalidate_disk(cd);
692 if (error)
693 goto unregister_cdrom;
694
695 error = device_add_disk(&sdev->sdev_gendev, disk, NULL);
696 if (error)
697 goto unregister_cdrom;
698
699 sdev_printk(KERN_DEBUG, sdev,
700 "Attached scsi CD-ROM %s\n", cd->cdi.name);
701 scsi_autopm_put_device(cd->device);
702
703 return 0;
704
705 unregister_cdrom:
706 unregister_cdrom(&cd->cdi);
707 fail_minor:
708 spin_lock(&sr_index_lock);
709 clear_bit(minor, sr_index_bits);
710 spin_unlock(&sr_index_lock);
711 fail_put:
712 put_disk(disk);
713 mutex_destroy(&cd->lock);
714 fail_free:
715 kfree(cd);
716 fail:
717 scsi_autopm_put_device(sdev);
718 return error;
719 }
720
721
get_sectorsize(struct scsi_cd * cd)722 static int get_sectorsize(struct scsi_cd *cd)
723 {
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;
728 int err;
729 int sector_size;
730 struct scsi_failure failure_defs[] = {
731 {
732 .result = SCMD_FAILURE_RESULT_ANY,
733 .allowed = 3,
734 },
735 {}
736 };
737 struct scsi_failures failures = {
738 .failure_definitions = failure_defs,
739 };
740 const struct scsi_exec_args exec_args = {
741 .failures = &failures,
742 };
743
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,
747 &exec_args);
748 if (err) {
749 cd->capacity = 0x1fffff;
750 sector_size = 2048; /* A guess, just in case */
751 } else {
752 long last_written;
753
754 cd->capacity = 1 + get_unaligned_be32(&buffer[0]);
755 /*
756 * READ_CAPACITY doesn't return the correct size on
757 * certain UDF media. If last_written is larger, use
758 * it instead.
759 *
760 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
761 */
762 if (!cdrom_get_last_written(&cd->cdi, &last_written))
763 cd->capacity = max_t(long, cd->capacity, last_written);
764
765 sector_size = get_unaligned_be32(&buffer[4]);
766 switch (sector_size) {
767 /*
768 * HP 4020i CD-Recorder reports 2340 byte sectors
769 * Philips CD-Writers report 2352 byte sectors
770 *
771 * Use 2k sectors for them..
772 */
773 case 0:
774 case 2340:
775 case 2352:
776 sector_size = 2048;
777 fallthrough;
778 case 2048:
779 cd->capacity *= 4;
780 fallthrough;
781 case 512:
782 break;
783 default:
784 sr_printk(KERN_INFO, cd,
785 "unsupported sector size %d.", sector_size);
786 cd->capacity = 0;
787 }
788
789 cd->device->sector_size = sector_size;
790
791 /*
792 * Add this so that we have the ability to correctly gauge
793 * what the device is capable of.
794 */
795 set_capacity(cd->disk, cd->capacity);
796 }
797
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);
803 return err;
804 }
805
get_capabilities(struct scsi_cd * cd)806 static int get_capabilities(struct scsi_cd *cd)
807 {
808 unsigned char *buffer;
809 struct scsi_mode_data data;
810 struct scsi_sense_hdr sshdr;
811 unsigned int ms_len = 128;
812 int rc, n;
813
814 static const char *loadmech[] =
815 {
816 "caddy",
817 "tray",
818 "pop-up",
819 "",
820 "changer",
821 "cartridge changer",
822 "",
823 ""
824 };
825
826
827 /* allocate transfer buffer */
828 buffer = kmalloc(512, GFP_KERNEL);
829 if (!buffer) {
830 sr_printk(KERN_ERR, cd, "out of memory.\n");
831 return -ENOMEM;
832 }
833
834 /* eat unit attentions */
835 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
836
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);
840
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 */
844 cd->cdi.speed = 1;
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);
849 kfree(buffer);
850 sr_printk(KERN_INFO, cd, "scsi-1 drive");
851 return 0;
852 }
853
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,
862 cd->cdi.speed,
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)
888 /* can't eject */
889 cd->cdi.mask |= CDC_OPEN_TRAY;
890
891 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
892 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
893 cd->cdi.capacity =
894 cdrom_number_of_slots(&cd->cdi);
895 if (cd->cdi.capacity <= 1)
896 /* not a changer */
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; */
900
901 /*
902 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
903 */
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)) {
906 cd->writeable = 1;
907 }
908
909 kfree(buffer);
910 return 0;
911 }
912
913 /*
914 * sr_packet() is the entry point for the generic commands generated
915 * by the Uniform CD-ROM layer.
916 */
sr_packet(struct cdrom_device_info * cdi,struct packet_command * cgc)917 static int sr_packet(struct cdrom_device_info *cdi,
918 struct packet_command *cgc)
919 {
920 struct scsi_cd *cd = cdi->handle;
921 struct scsi_device *sdev = cd->device;
922
923 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
924 return -EDRIVE_CANT_DO_THIS;
925
926 if (cgc->timeout <= 0)
927 cgc->timeout = IOCTL_TIMEOUT;
928
929 sr_do_ioctl(cd, cgc);
930
931 return cgc->stat;
932 }
933
sr_read_cdda_bpc(struct cdrom_device_info * cdi,void __user * ubuf,u32 lba,u32 nr,u8 * last_sense)934 static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
935 u32 lba, u32 nr, u8 *last_sense)
936 {
937 struct gendisk *disk = cdi->disk;
938 u32 len = nr * CD_FRAMESIZE_RAW;
939 struct scsi_cmnd *scmd;
940 struct request *rq;
941 struct bio *bio;
942 int ret;
943
944 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0);
945 if (IS_ERR(rq))
946 return PTR_ERR(rq);
947 scmd = blk_mq_rq_to_pdu(rq);
948
949 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL);
950 if (ret)
951 goto out_put_request;
952
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;
963 scmd->cmd_len = 12;
964 rq->timeout = 60 * HZ;
965 bio = rq->bio;
966
967 blk_execute_rq(rq, false);
968 if (scmd->result) {
969 struct scsi_sense_hdr sshdr;
970
971 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,
972 &sshdr);
973 *last_sense = sshdr.sense_key;
974 ret = -EIO;
975 }
976
977 if (blk_rq_unmap_user(bio))
978 ret = -EFAULT;
979 out_put_request:
980 blk_mq_free_request(rq);
981 return ret;
982 }
983
sr_remove(struct device * dev)984 static int sr_remove(struct device *dev)
985 {
986 struct scsi_cd *cd = dev_get_drvdata(dev);
987
988 scsi_autopm_get_device(cd->device);
989
990 del_gendisk(cd->disk);
991 put_disk(cd->disk);
992
993 return 0;
994 }
995
init_sr(void)996 static int __init init_sr(void)
997 {
998 int rc;
999
1000 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
1001 if (rc)
1002 return rc;
1003 rc = scsi_register_driver(&sr_template.gendrv);
1004 if (rc)
1005 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1006
1007 return rc;
1008 }
1009
exit_sr(void)1010 static void __exit exit_sr(void)
1011 {
1012 scsi_unregister_driver(&sr_template.gendrv);
1013 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1014 }
1015
1016 module_init(init_sr);
1017 module_exit(exit_sr);
1018 MODULE_LICENSE("GPL");
1019