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1/*
2 * sr.c Copyright (C) 1992 David Giller
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 * adapted from:
6 * sd.c Copyright (C) 1992 Drew Eckhardt
7 * Linux scsi disk driver by
8 * Drew Eckhardt <drew@colorado.edu>
9 *
10 * Modified by Eric Youngdale ericy@andante.org to
11 * add scatter-gather, multiple outstanding request, and other
12 * enhancements.
13 *
14 * Modified by Eric Youngdale eric@andante.org to support loadable
15 * low-level scsi drivers.
16 *
17 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
18 * provide auto-eject.
19 *
20 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
21 * generic cdrom interface
22 *
23 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
24 * interface, capabilities probe additions, ioctl cleanups, etc.
25 *
26 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
27 *
28 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
29 * transparently and lose the GHOST hack
30 *
31 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
32 * check resource allocation in sr_init and some cleanups
33 */
34
35#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/kernel.h>
38#include <linux/mm.h>
39#include <linux/bio.h>
40#include <linux/string.h>
41#include <linux/errno.h>
42#include <linux/cdrom.h>
43#include <linux/interrupt.h>
44#include <linux/init.h>
45#include <linux/blkdev.h>
46#include <linux/mutex.h>
47#include <linux/slab.h>
48#include <asm/uaccess.h>
49
50#include <scsi/scsi.h>
51#include <scsi/scsi_dbg.h>
52#include <scsi/scsi_device.h>
53#include <scsi/scsi_driver.h>
54#include <scsi/scsi_cmnd.h>
55#include <scsi/scsi_eh.h>
56#include <scsi/scsi_host.h>
57#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
58
59#include "scsi_logging.h"
60#include "sr.h"
61
62
63MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
64MODULE_LICENSE("GPL");
65MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
66MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
67MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
68
69#define SR_DISKS 256
70
71#define SR_CAPABILITIES \
72 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
73 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
74 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
75 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
76 CDC_MRW|CDC_MRW_W|CDC_RAM)
77
78static DEFINE_MUTEX(sr_mutex);
79static int sr_probe(struct device *);
80static int sr_remove(struct device *);
81static int sr_done(struct scsi_cmnd *);
82
83static struct scsi_driver sr_template = {
84 .owner = THIS_MODULE,
85 .gendrv = {
86 .name = "sr",
87 .probe = sr_probe,
88 .remove = sr_remove,
89 },
90 .done = sr_done,
91};
92
93static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
94static DEFINE_SPINLOCK(sr_index_lock);
95
96/* This semaphore is used to mediate the 0->1 reference get in the
97 * face of object destruction (i.e. we can't allow a get on an
98 * object after last put) */
99static DEFINE_MUTEX(sr_ref_mutex);
100
101static int sr_open(struct cdrom_device_info *, int);
102static void sr_release(struct cdrom_device_info *);
103
104static void get_sectorsize(struct scsi_cd *);
105static void get_capabilities(struct scsi_cd *);
106
107static unsigned int sr_check_events(struct cdrom_device_info *cdi,
108 unsigned int clearing, int slot);
109static int sr_packet(struct cdrom_device_info *, struct packet_command *);
110
111static struct cdrom_device_ops sr_dops = {
112 .open = sr_open,
113 .release = sr_release,
114 .drive_status = sr_drive_status,
115 .check_events = sr_check_events,
116 .tray_move = sr_tray_move,
117 .lock_door = sr_lock_door,
118 .select_speed = sr_select_speed,
119 .get_last_session = sr_get_last_session,
120 .get_mcn = sr_get_mcn,
121 .reset = sr_reset,
122 .audio_ioctl = sr_audio_ioctl,
123 .capability = SR_CAPABILITIES,
124 .generic_packet = sr_packet,
125};
126
127static void sr_kref_release(struct kref *kref);
128
129static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
130{
131 return container_of(disk->private_data, struct scsi_cd, driver);
132}
133
134/*
135 * The get and put routines for the struct scsi_cd. Note this entity
136 * has a scsi_device pointer and owns a reference to this.
137 */
138static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
139{
140 struct scsi_cd *cd = NULL;
141
142 mutex_lock(&sr_ref_mutex);
143 if (disk->private_data == NULL)
144 goto out;
145 cd = scsi_cd(disk);
146 kref_get(&cd->kref);
147 if (scsi_device_get(cd->device))
148 goto out_put;
149 goto out;
150
151 out_put:
152 kref_put(&cd->kref, sr_kref_release);
153 cd = NULL;
154 out:
155 mutex_unlock(&sr_ref_mutex);
156 return cd;
157}
158
159static void scsi_cd_put(struct scsi_cd *cd)
160{
161 struct scsi_device *sdev = cd->device;
162
163 mutex_lock(&sr_ref_mutex);
164 kref_put(&cd->kref, sr_kref_release);
165 scsi_device_put(sdev);
166 mutex_unlock(&sr_ref_mutex);
167}
168
169static unsigned int sr_get_events(struct scsi_device *sdev)
170{
171 u8 buf[8];
172 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
173 1, /* polled */
174 0, 0, /* reserved */
175 1 << 4, /* notification class: media */
176 0, 0, /* reserved */
177 0, sizeof(buf), /* allocation length */
178 0, /* control */
179 };
180 struct event_header *eh = (void *)buf;
181 struct media_event_desc *med = (void *)(buf + 4);
182 struct scsi_sense_hdr sshdr;
183 int result;
184
185 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
186 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
187 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
188 return DISK_EVENT_MEDIA_CHANGE;
189
190 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
191 return 0;
192
193 if (eh->nea || eh->notification_class != 0x4)
194 return 0;
195
196 if (med->media_event_code == 1)
197 return DISK_EVENT_EJECT_REQUEST;
198 else if (med->media_event_code == 2)
199 return DISK_EVENT_MEDIA_CHANGE;
200 return 0;
201}
202
203/*
204 * This function checks to see if the media has been changed or eject
205 * button has been pressed. It is possible that we have already
206 * sensed a change, or the drive may have sensed one and not yet
207 * reported it. The past events are accumulated in sdev->changed and
208 * returned together with the current state.
209 */
210static unsigned int sr_check_events(struct cdrom_device_info *cdi,
211 unsigned int clearing, int slot)
212{
213 struct scsi_cd *cd = cdi->handle;
214 bool last_present;
215 struct scsi_sense_hdr sshdr;
216 unsigned int events;
217 int ret;
218
219 /* no changer support */
220 if (CDSL_CURRENT != slot)
221 return 0;
222
223 events = sr_get_events(cd->device);
224 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
225
226 /*
227 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
228 * for several times in a row. We rely on TUR only for this likely
229 * broken device, to prevent generating incorrect media changed
230 * events for every open().
231 */
232 if (cd->ignore_get_event) {
233 events &= ~DISK_EVENT_MEDIA_CHANGE;
234 goto do_tur;
235 }
236
237 /*
238 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
239 * is being cleared. Note that there are devices which hang
240 * if asked to execute TUR repeatedly.
241 */
242 if (cd->device->changed) {
243 events |= DISK_EVENT_MEDIA_CHANGE;
244 cd->device->changed = 0;
245 cd->tur_changed = true;
246 }
247
248 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
249 return events;
250do_tur:
251 /* let's see whether the media is there with TUR */
252 last_present = cd->media_present;
253 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
254
255 /*
256 * Media is considered to be present if TUR succeeds or fails with
257 * sense data indicating something other than media-not-present
258 * (ASC 0x3a).
259 */
260 cd->media_present = scsi_status_is_good(ret) ||
261 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
262
263 if (last_present != cd->media_present)
264 cd->device->changed = 1;
265
266 if (cd->device->changed) {
267 events |= DISK_EVENT_MEDIA_CHANGE;
268 cd->device->changed = 0;
269 cd->tur_changed = true;
270 }
271
272 if (cd->ignore_get_event)
273 return events;
274
275 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
276 if (!cd->tur_changed) {
277 if (cd->get_event_changed) {
278 if (cd->tur_mismatch++ > 8) {
279 sdev_printk(KERN_WARNING, cd->device,
280 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
281 cd->ignore_get_event = true;
282 }
283 } else {
284 cd->tur_mismatch = 0;
285 }
286 }
287 cd->tur_changed = false;
288 cd->get_event_changed = false;
289
290 return events;
291}
292
293/*
294 * sr_done is the interrupt routine for the device driver.
295 *
296 * It will be notified on the end of a SCSI read / write, and will take one
297 * of several actions based on success or failure.
298 */
299static int sr_done(struct scsi_cmnd *SCpnt)
300{
301 int result = SCpnt->result;
302 int this_count = scsi_bufflen(SCpnt);
303 int good_bytes = (result == 0 ? this_count : 0);
304 int block_sectors = 0;
305 long error_sector;
306 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
307
308#ifdef DEBUG
309 printk("sr.c done: %x\n", result);
310#endif
311
312 /*
313 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
314 * success. Since this is a relatively rare error condition, no
315 * care is taken to avoid unnecessary additional work such as
316 * memcpy's that could be avoided.
317 */
318 if (driver_byte(result) != 0 && /* An error occurred */
319 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
320 switch (SCpnt->sense_buffer[2]) {
321 case MEDIUM_ERROR:
322 case VOLUME_OVERFLOW:
323 case ILLEGAL_REQUEST:
324 if (!(SCpnt->sense_buffer[0] & 0x90))
325 break;
326 error_sector = (SCpnt->sense_buffer[3] << 24) |
327 (SCpnt->sense_buffer[4] << 16) |
328 (SCpnt->sense_buffer[5] << 8) |
329 SCpnt->sense_buffer[6];
330 if (SCpnt->request->bio != NULL)
331 block_sectors =
332 bio_sectors(SCpnt->request->bio);
333 if (block_sectors < 4)
334 block_sectors = 4;
335 if (cd->device->sector_size == 2048)
336 error_sector <<= 2;
337 error_sector &= ~(block_sectors - 1);
338 good_bytes = (error_sector -
339 blk_rq_pos(SCpnt->request)) << 9;
340 if (good_bytes < 0 || good_bytes >= this_count)
341 good_bytes = 0;
342 /*
343 * The SCSI specification allows for the value
344 * returned by READ CAPACITY to be up to 75 2K
345 * sectors past the last readable block.
346 * Therefore, if we hit a medium error within the
347 * last 75 2K sectors, we decrease the saved size
348 * value.
349 */
350 if (error_sector < get_capacity(cd->disk) &&
351 cd->capacity - error_sector < 4 * 75)
352 set_capacity(cd->disk, error_sector);
353 break;
354
355 case RECOVERED_ERROR:
356 good_bytes = this_count;
357 break;
358
359 default:
360 break;
361 }
362 }
363
364 return good_bytes;
365}
366
367static int sr_prep_fn(struct request_queue *q, struct request *rq)
368{
369 int block = 0, this_count, s_size;
370 struct scsi_cd *cd;
371 struct scsi_cmnd *SCpnt;
372 struct scsi_device *sdp = q->queuedata;
373 int ret;
374
375 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
376 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
377 goto out;
378 } else if (rq->cmd_type != REQ_TYPE_FS) {
379 ret = BLKPREP_KILL;
380 goto out;
381 }
382 ret = scsi_setup_fs_cmnd(sdp, rq);
383 if (ret != BLKPREP_OK)
384 goto out;
385 SCpnt = rq->special;
386 cd = scsi_cd(rq->rq_disk);
387
388 /* from here on until we're complete, any goto out
389 * is used for a killable error condition */
390 ret = BLKPREP_KILL;
391
392 SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n",
393 cd->disk->disk_name, block));
394
395 if (!cd->device || !scsi_device_online(cd->device)) {
396 SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
397 blk_rq_sectors(rq)));
398 SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
399 goto out;
400 }
401
402 if (cd->device->changed) {
403 /*
404 * quietly refuse to do anything to a changed disc until the
405 * changed bit has been reset
406 */
407 goto out;
408 }
409
410 /*
411 * we do lazy blocksize switching (when reading XA sectors,
412 * see CDROMREADMODE2 ioctl)
413 */
414 s_size = cd->device->sector_size;
415 if (s_size > 2048) {
416 if (!in_interrupt())
417 sr_set_blocklength(cd, 2048);
418 else
419 printk("sr: can't switch blocksize: in interrupt\n");
420 }
421
422 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
423 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
424 goto out;
425 }
426
427 if (rq_data_dir(rq) == WRITE) {
428 if (!cd->device->writeable)
429 goto out;
430 SCpnt->cmnd[0] = WRITE_10;
431 SCpnt->sc_data_direction = DMA_TO_DEVICE;
432 cd->cdi.media_written = 1;
433 } else if (rq_data_dir(rq) == READ) {
434 SCpnt->cmnd[0] = READ_10;
435 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
436 } else {
437 blk_dump_rq_flags(rq, "Unknown sr command");
438 goto out;
439 }
440
441 {
442 struct scatterlist *sg;
443 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
444
445 scsi_for_each_sg(SCpnt, sg, sg_count, i)
446 size += sg->length;
447
448 if (size != scsi_bufflen(SCpnt)) {
449 scmd_printk(KERN_ERR, SCpnt,
450 "mismatch count %d, bytes %d\n",
451 size, scsi_bufflen(SCpnt));
452 if (scsi_bufflen(SCpnt) > size)
453 SCpnt->sdb.length = size;
454 }
455 }
456
457 /*
458 * request doesn't start on hw block boundary, add scatter pads
459 */
460 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
461 (scsi_bufflen(SCpnt) % s_size)) {
462 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
463 goto out;
464 }
465
466 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
467
468
469 SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
470 cd->cdi.name,
471 (rq_data_dir(rq) == WRITE) ?
472 "writing" : "reading",
473 this_count, blk_rq_sectors(rq)));
474
475 SCpnt->cmnd[1] = 0;
476 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
477
478 if (this_count > 0xffff) {
479 this_count = 0xffff;
480 SCpnt->sdb.length = this_count * s_size;
481 }
482
483 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
484 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
485 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
486 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
487 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
488 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
489 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
490
491 /*
492 * We shouldn't disconnect in the middle of a sector, so with a dumb
493 * host adapter, it's safe to assume that we can at least transfer
494 * this many bytes between each connect / disconnect.
495 */
496 SCpnt->transfersize = cd->device->sector_size;
497 SCpnt->underflow = this_count << 9;
498 SCpnt->allowed = MAX_RETRIES;
499
500 /*
501 * This indicates that the command is ready from our end to be
502 * queued.
503 */
504 ret = BLKPREP_OK;
505 out:
506 return scsi_prep_return(q, rq, ret);
507}
508
509static int sr_block_open(struct block_device *bdev, fmode_t mode)
510{
511 struct scsi_cd *cd;
512 int ret = -ENXIO;
513
514 mutex_lock(&sr_mutex);
515 cd = scsi_cd_get(bdev->bd_disk);
516 if (cd) {
517 ret = cdrom_open(&cd->cdi, bdev, mode);
518 if (ret)
519 scsi_cd_put(cd);
520 }
521 mutex_unlock(&sr_mutex);
522 return ret;
523}
524
525static int sr_block_release(struct gendisk *disk, fmode_t mode)
526{
527 struct scsi_cd *cd = scsi_cd(disk);
528 mutex_lock(&sr_mutex);
529 cdrom_release(&cd->cdi, mode);
530 scsi_cd_put(cd);
531 mutex_unlock(&sr_mutex);
532 return 0;
533}
534
535static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
536 unsigned long arg)
537{
538 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
539 struct scsi_device *sdev = cd->device;
540 void __user *argp = (void __user *)arg;
541 int ret;
542
543 mutex_lock(&sr_mutex);
544
545 /*
546 * Send SCSI addressing ioctls directly to mid level, send other
547 * ioctls to cdrom/block level.
548 */
549 switch (cmd) {
550 case SCSI_IOCTL_GET_IDLUN:
551 case SCSI_IOCTL_GET_BUS_NUMBER:
552 ret = scsi_ioctl(sdev, cmd, argp);
553 goto out;
554 }
555
556 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
557 if (ret != -ENOSYS)
558 goto out;
559
560 /*
561 * ENODEV means that we didn't recognise the ioctl, or that we
562 * cannot execute it in the current device state. In either
563 * case fall through to scsi_ioctl, which will return ENDOEV again
564 * if it doesn't recognise the ioctl
565 */
566 ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
567 (mode & FMODE_NDELAY) != 0);
568 if (ret != -ENODEV)
569 goto out;
570 ret = scsi_ioctl(sdev, cmd, argp);
571
572out:
573 mutex_unlock(&sr_mutex);
574 return ret;
575}
576
577static unsigned int sr_block_check_events(struct gendisk *disk,
578 unsigned int clearing)
579{
580 struct scsi_cd *cd = scsi_cd(disk);
581 return cdrom_check_events(&cd->cdi, clearing);
582}
583
584static int sr_block_revalidate_disk(struct gendisk *disk)
585{
586 struct scsi_cd *cd = scsi_cd(disk);
587 struct scsi_sense_hdr sshdr;
588
589 /* if the unit is not ready, nothing more to do */
590 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
591 return 0;
592
593 sr_cd_check(&cd->cdi);
594 get_sectorsize(cd);
595 return 0;
596}
597
598static const struct block_device_operations sr_bdops =
599{
600 .owner = THIS_MODULE,
601 .open = sr_block_open,
602 .release = sr_block_release,
603 .ioctl = sr_block_ioctl,
604 .check_events = sr_block_check_events,
605 .revalidate_disk = sr_block_revalidate_disk,
606 /*
607 * No compat_ioctl for now because sr_block_ioctl never
608 * seems to pass arbitrary ioctls down to host drivers.
609 */
610};
611
612static int sr_open(struct cdrom_device_info *cdi, int purpose)
613{
614 struct scsi_cd *cd = cdi->handle;
615 struct scsi_device *sdev = cd->device;
616 int retval;
617
618 /*
619 * If the device is in error recovery, wait until it is done.
620 * If the device is offline, then disallow any access to it.
621 */
622 retval = -ENXIO;
623 if (!scsi_block_when_processing_errors(sdev))
624 goto error_out;
625
626 return 0;
627
628error_out:
629 return retval;
630}
631
632static void sr_release(struct cdrom_device_info *cdi)
633{
634 struct scsi_cd *cd = cdi->handle;
635
636 if (cd->device->sector_size > 2048)
637 sr_set_blocklength(cd, 2048);
638
639}
640
641static int sr_probe(struct device *dev)
642{
643 struct scsi_device *sdev = to_scsi_device(dev);
644 struct gendisk *disk;
645 struct scsi_cd *cd;
646 int minor, error;
647
648 error = -ENODEV;
649 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
650 goto fail;
651
652 error = -ENOMEM;
653 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
654 if (!cd)
655 goto fail;
656
657 kref_init(&cd->kref);
658
659 disk = alloc_disk(1);
660 if (!disk)
661 goto fail_free;
662
663 spin_lock(&sr_index_lock);
664 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
665 if (minor == SR_DISKS) {
666 spin_unlock(&sr_index_lock);
667 error = -EBUSY;
668 goto fail_put;
669 }
670 __set_bit(minor, sr_index_bits);
671 spin_unlock(&sr_index_lock);
672
673 disk->major = SCSI_CDROM_MAJOR;
674 disk->first_minor = minor;
675 sprintf(disk->disk_name, "sr%d", minor);
676 disk->fops = &sr_bdops;
677 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
678 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
679
680 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
681
682 cd->device = sdev;
683 cd->disk = disk;
684 cd->driver = &sr_template;
685 cd->disk = disk;
686 cd->capacity = 0x1fffff;
687 cd->device->changed = 1; /* force recheck CD type */
688 cd->media_present = 1;
689 cd->use = 1;
690 cd->readcd_known = 0;
691 cd->readcd_cdda = 0;
692
693 cd->cdi.ops = &sr_dops;
694 cd->cdi.handle = cd;
695 cd->cdi.mask = 0;
696 cd->cdi.capacity = 1;
697 sprintf(cd->cdi.name, "sr%d", minor);
698
699 sdev->sector_size = 2048; /* A guess, just in case */
700
701 /* FIXME: need to handle a get_capabilities failure properly ?? */
702 get_capabilities(cd);
703 blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
704 sr_vendor_init(cd);
705
706 disk->driverfs_dev = &sdev->sdev_gendev;
707 set_capacity(disk, cd->capacity);
708 disk->private_data = &cd->driver;
709 disk->queue = sdev->request_queue;
710 cd->cdi.disk = disk;
711
712 if (register_cdrom(&cd->cdi))
713 goto fail_put;
714
715 dev_set_drvdata(dev, cd);
716 disk->flags |= GENHD_FL_REMOVABLE;
717 add_disk(disk);
718
719 sdev_printk(KERN_DEBUG, sdev,
720 "Attached scsi CD-ROM %s\n", cd->cdi.name);
721 return 0;
722
723fail_put:
724 put_disk(disk);
725fail_free:
726 kfree(cd);
727fail:
728 return error;
729}
730
731
732static void get_sectorsize(struct scsi_cd *cd)
733{
734 unsigned char cmd[10];
735 unsigned char buffer[8];
736 int the_result, retries = 3;
737 int sector_size;
738 struct request_queue *queue;
739
740 do {
741 cmd[0] = READ_CAPACITY;
742 memset((void *) &cmd[1], 0, 9);
743 memset(buffer, 0, sizeof(buffer));
744
745 /* Do the command and wait.. */
746 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
747 buffer, sizeof(buffer), NULL,
748 SR_TIMEOUT, MAX_RETRIES, NULL);
749
750 retries--;
751
752 } while (the_result && retries);
753
754
755 if (the_result) {
756 cd->capacity = 0x1fffff;
757 sector_size = 2048; /* A guess, just in case */
758 } else {
759 long last_written;
760
761 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
762 (buffer[2] << 8) | buffer[3]);
763 /*
764 * READ_CAPACITY doesn't return the correct size on
765 * certain UDF media. If last_written is larger, use
766 * it instead.
767 *
768 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
769 */
770 if (!cdrom_get_last_written(&cd->cdi, &last_written))
771 cd->capacity = max_t(long, cd->capacity, last_written);
772
773 sector_size = (buffer[4] << 24) |
774 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
775 switch (sector_size) {
776 /*
777 * HP 4020i CD-Recorder reports 2340 byte sectors
778 * Philips CD-Writers report 2352 byte sectors
779 *
780 * Use 2k sectors for them..
781 */
782 case 0:
783 case 2340:
784 case 2352:
785 sector_size = 2048;
786 /* fall through */
787 case 2048:
788 cd->capacity *= 4;
789 /* fall through */
790 case 512:
791 break;
792 default:
793 printk("%s: unsupported sector size %d.\n",
794 cd->cdi.name, sector_size);
795 cd->capacity = 0;
796 }
797
798 cd->device->sector_size = sector_size;
799
800 /*
801 * Add this so that we have the ability to correctly gauge
802 * what the device is capable of.
803 */
804 set_capacity(cd->disk, cd->capacity);
805 }
806
807 queue = cd->device->request_queue;
808 blk_queue_logical_block_size(queue, sector_size);
809
810 return;
811}
812
813static void get_capabilities(struct scsi_cd *cd)
814{
815 unsigned char *buffer;
816 struct scsi_mode_data data;
817 struct scsi_sense_hdr sshdr;
818 int rc, n;
819
820 static const char *loadmech[] =
821 {
822 "caddy",
823 "tray",
824 "pop-up",
825 "",
826 "changer",
827 "cartridge changer",
828 "",
829 ""
830 };
831
832
833 /* allocate transfer buffer */
834 buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
835 if (!buffer) {
836 printk(KERN_ERR "sr: out of memory.\n");
837 return;
838 }
839
840 /* eat unit attentions */
841 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
842
843 /* ask for mode page 0x2a */
844 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
845 SR_TIMEOUT, 3, &data, NULL);
846
847 if (!scsi_status_is_good(rc)) {
848 /* failed, drive doesn't have capabilities mode page */
849 cd->cdi.speed = 1;
850 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
851 CDC_DVD | CDC_DVD_RAM |
852 CDC_SELECT_DISC | CDC_SELECT_SPEED |
853 CDC_MRW | CDC_MRW_W | CDC_RAM);
854 kfree(buffer);
855 printk("%s: scsi-1 drive\n", cd->cdi.name);
856 return;
857 }
858
859 n = data.header_length + data.block_descriptor_length;
860 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
861 cd->readcd_known = 1;
862 cd->readcd_cdda = buffer[n + 5] & 0x01;
863 /* print some capability bits */
864 printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
865 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
866 cd->cdi.speed,
867 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
868 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
869 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
870 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
871 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
872 loadmech[buffer[n + 6] >> 5]);
873 if ((buffer[n + 6] >> 5) == 0)
874 /* caddy drives can't close tray... */
875 cd->cdi.mask |= CDC_CLOSE_TRAY;
876 if ((buffer[n + 2] & 0x8) == 0)
877 /* not a DVD drive */
878 cd->cdi.mask |= CDC_DVD;
879 if ((buffer[n + 3] & 0x20) == 0)
880 /* can't write DVD-RAM media */
881 cd->cdi.mask |= CDC_DVD_RAM;
882 if ((buffer[n + 3] & 0x10) == 0)
883 /* can't write DVD-R media */
884 cd->cdi.mask |= CDC_DVD_R;
885 if ((buffer[n + 3] & 0x2) == 0)
886 /* can't write CD-RW media */
887 cd->cdi.mask |= CDC_CD_RW;
888 if ((buffer[n + 3] & 0x1) == 0)
889 /* can't write CD-R media */
890 cd->cdi.mask |= CDC_CD_R;
891 if ((buffer[n + 6] & 0x8) == 0)
892 /* can't eject */
893 cd->cdi.mask |= CDC_OPEN_TRAY;
894
895 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
896 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
897 cd->cdi.capacity =
898 cdrom_number_of_slots(&cd->cdi);
899 if (cd->cdi.capacity <= 1)
900 /* not a changer */
901 cd->cdi.mask |= CDC_SELECT_DISC;
902 /*else I don't think it can close its tray
903 cd->cdi.mask |= CDC_CLOSE_TRAY; */
904
905 /*
906 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
907 */
908 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
909 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
910 cd->device->writeable = 1;
911 }
912
913 kfree(buffer);
914}
915
916/*
917 * sr_packet() is the entry point for the generic commands generated
918 * by the Uniform CD-ROM layer.
919 */
920static int sr_packet(struct cdrom_device_info *cdi,
921 struct packet_command *cgc)
922{
923 struct scsi_cd *cd = cdi->handle;
924 struct scsi_device *sdev = cd->device;
925
926 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
927 return -EDRIVE_CANT_DO_THIS;
928
929 if (cgc->timeout <= 0)
930 cgc->timeout = IOCTL_TIMEOUT;
931
932 sr_do_ioctl(cd, cgc);
933
934 return cgc->stat;
935}
936
937/**
938 * sr_kref_release - Called to free the scsi_cd structure
939 * @kref: pointer to embedded kref
940 *
941 * sr_ref_mutex must be held entering this routine. Because it is
942 * called on last put, you should always use the scsi_cd_get()
943 * scsi_cd_put() helpers which manipulate the semaphore directly
944 * and never do a direct kref_put().
945 **/
946static void sr_kref_release(struct kref *kref)
947{
948 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
949 struct gendisk *disk = cd->disk;
950
951 spin_lock(&sr_index_lock);
952 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
953 spin_unlock(&sr_index_lock);
954
955 unregister_cdrom(&cd->cdi);
956
957 disk->private_data = NULL;
958
959 put_disk(disk);
960
961 kfree(cd);
962}
963
964static int sr_remove(struct device *dev)
965{
966 struct scsi_cd *cd = dev_get_drvdata(dev);
967
968 blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
969 del_gendisk(cd->disk);
970
971 mutex_lock(&sr_ref_mutex);
972 kref_put(&cd->kref, sr_kref_release);
973 mutex_unlock(&sr_ref_mutex);
974
975 return 0;
976}
977
978static int __init init_sr(void)
979{
980 int rc;
981
982 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
983 if (rc)
984 return rc;
985 rc = scsi_register_driver(&sr_template.gendrv);
986 if (rc)
987 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
988
989 return rc;
990}
991
992static void __exit exit_sr(void)
993{
994 scsi_unregister_driver(&sr_template.gendrv);
995 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
996}
997
998module_init(init_sr);
999module_exit(exit_sr);
1000MODULE_LICENSE("GPL");
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
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 device *);
86static int sr_remove(struct 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 .gendrv = {
97 .name = "sr",
98 .owner = THIS_MODULE,
99 .probe = sr_probe,
100 .remove = sr_remove,
101 .pm = &sr_pm_ops,
102 },
103 .init_command = sr_init_command,
104 .done = sr_done,
105};
106
107static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
108static DEFINE_SPINLOCK(sr_index_lock);
109
110static struct lock_class_key sr_bio_compl_lkclass;
111
112static int sr_open(struct cdrom_device_info *, int);
113static void sr_release(struct cdrom_device_info *);
114
115static void get_sectorsize(struct scsi_cd *);
116static int get_capabilities(struct scsi_cd *);
117
118static unsigned int sr_check_events(struct cdrom_device_info *cdi,
119 unsigned int clearing, int slot);
120static int sr_packet(struct cdrom_device_info *, struct packet_command *);
121static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
122 u32 lba, u32 nr, u8 *last_sense);
123
124static const struct cdrom_device_ops sr_dops = {
125 .open = sr_open,
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,
134 .reset = sr_reset,
135 .audio_ioctl = sr_audio_ioctl,
136 .generic_packet = sr_packet,
137 .read_cdda_bpc = sr_read_cdda_bpc,
138 .capability = SR_CAPABILITIES,
139};
140
141static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
142{
143 return disk->private_data;
144}
145
146static int sr_runtime_suspend(struct device *dev)
147{
148 struct scsi_cd *cd = dev_get_drvdata(dev);
149
150 if (!cd) /* E.g.: runtime suspend following sr_remove() */
151 return 0;
152
153 if (cd->media_present)
154 return -EBUSY;
155 else
156 return 0;
157}
158
159static unsigned int sr_get_events(struct scsi_device *sdev)
160{
161 u8 buf[8];
162 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
163 1, /* polled */
164 0, 0, /* reserved */
165 1 << 4, /* notification class: media */
166 0, 0, /* reserved */
167 0, sizeof(buf), /* allocation length */
168 0, /* control */
169 };
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 = {
174 .sshdr = &sshdr,
175 };
176 int result;
177
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;
183
184 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
185 return 0;
186
187 if (eh->nea || eh->notification_class != 0x4)
188 return 0;
189
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;
196 return 0;
197}
198
199/*
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.
205 */
206static unsigned int sr_check_events(struct cdrom_device_info *cdi,
207 unsigned int clearing, int slot)
208{
209 struct scsi_cd *cd = cdi->handle;
210 bool last_present;
211 struct scsi_sense_hdr sshdr;
212 unsigned int events;
213 int ret;
214
215 /* no changer support */
216 if (CDSL_CURRENT != slot)
217 return 0;
218
219 events = sr_get_events(cd->device);
220 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
221
222 /*
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().
227 */
228 if (cd->ignore_get_event) {
229 events &= ~DISK_EVENT_MEDIA_CHANGE;
230 goto do_tur;
231 }
232
233 /*
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.
237 */
238 if (cd->device->changed) {
239 events |= DISK_EVENT_MEDIA_CHANGE;
240 cd->device->changed = 0;
241 cd->tur_changed = true;
242 }
243
244 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
245 return events;
246do_tur:
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);
250
251 /*
252 * Media is considered to be present if TUR succeeds or fails with
253 * sense data indicating something other than media-not-present
254 * (ASC 0x3a).
255 */
256 cd->media_present = scsi_status_is_good(ret) ||
257 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
258
259 if (last_present != cd->media_present)
260 cd->device->changed = 1;
261
262 if (cd->device->changed) {
263 events |= DISK_EVENT_MEDIA_CHANGE;
264 cd->device->changed = 0;
265 cd->tur_changed = true;
266 }
267
268 if (cd->ignore_get_event)
269 return events;
270
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;
278 }
279 } else {
280 cd->tur_mismatch = 0;
281 }
282 }
283 cd->tur_changed = false;
284 cd->get_event_changed = false;
285
286 return events;
287}
288
289/*
290 * sr_done is the interrupt routine for the device driver.
291 *
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.
294 */
295static int sr_done(struct scsi_cmnd *SCpnt)
296{
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;
301 long error_sector;
302 struct request *rq = scsi_cmd_to_rq(SCpnt);
303 struct scsi_cd *cd = scsi_cd(rq->q->disk);
304
305#ifdef DEBUG
306 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
307#endif
308
309 /*
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.
314 */
315 if (scsi_status_is_check_condition(result) &&
316 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
317 switch (SCpnt->sense_buffer[2]) {
318 case MEDIUM_ERROR:
319 case VOLUME_OVERFLOW:
320 case ILLEGAL_REQUEST:
321 if (!(SCpnt->sense_buffer[0] & 0x90))
322 break;
323 error_sector =
324 get_unaligned_be32(&SCpnt->sense_buffer[3]);
325 if (rq->bio != NULL)
326 block_sectors = bio_sectors(rq->bio);
327 if (block_sectors < 4)
328 block_sectors = 4;
329 if (cd->device->sector_size == 2048)
330 error_sector <<= 2;
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)
334 good_bytes = 0;
335 /*
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
341 * value.
342 */
343 if (error_sector < get_capacity(cd->disk) &&
344 cd->capacity - error_sector < 4 * 75)
345 set_capacity(cd->disk, error_sector);
346 break;
347
348 case RECOVERED_ERROR:
349 good_bytes = this_count;
350 break;
351
352 default:
353 break;
354 }
355 }
356
357 return good_bytes;
358}
359
360static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
361{
362 int block = 0, this_count, s_size;
363 struct scsi_cd *cd;
364 struct request *rq = scsi_cmd_to_rq(SCpnt);
365 blk_status_t ret;
366
367 ret = scsi_alloc_sgtables(SCpnt);
368 if (ret != BLK_STS_OK)
369 return ret;
370 cd = scsi_cd(rq->q->disk);
371
372 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
373 "Doing sr request, block = %d\n", block));
374
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));
380 goto out;
381 }
382
383 if (cd->device->changed) {
384 /*
385 * quietly refuse to do anything to a changed disc until the
386 * changed bit has been reset
387 */
388 goto out;
389 }
390
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);
394 goto out;
395 }
396
397 switch (req_op(rq)) {
398 case REQ_OP_WRITE:
399 if (!cd->writeable)
400 goto out;
401 SCpnt->cmnd[0] = WRITE_10;
402 cd->cdi.media_written = 1;
403 break;
404 case REQ_OP_READ:
405 SCpnt->cmnd[0] = READ_10;
406 break;
407 default:
408 blk_dump_rq_flags(rq, "Unknown sr command");
409 goto out;
410 }
411
412 {
413 struct scatterlist *sg;
414 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
415
416 scsi_for_each_sg(SCpnt, sg, sg_count, i)
417 size += sg->length;
418
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;
425 }
426 }
427
428 /*
429 * request doesn't start on hw block boundary, add scatter pads
430 */
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");
434 goto out;
435 }
436
437 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
438
439
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)));
445
446 SCpnt->cmnd[1] = 0;
447 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
448
449 if (this_count > 0xffff) {
450 this_count = 0xffff;
451 SCpnt->sdb.length = this_count * s_size;
452 }
453
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]);
457
458 /*
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.
462 */
463 SCpnt->transfersize = cd->device->sector_size;
464 SCpnt->underflow = this_count << 9;
465 SCpnt->allowed = MAX_RETRIES;
466 SCpnt->cmd_len = 10;
467
468 /*
469 * This indicates that the command is ready from our end to be queued.
470 */
471 return BLK_STS_OK;
472 out:
473 scsi_free_sgtables(SCpnt);
474 return BLK_STS_IOERR;
475}
476
477static void sr_revalidate_disk(struct scsi_cd *cd)
478{
479 struct scsi_sense_hdr sshdr;
480
481 /* if the unit is not ready, nothing more to do */
482 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
483 return;
484 sr_cd_check(&cd->cdi);
485 get_sectorsize(cd);
486}
487
488static int sr_block_open(struct gendisk *disk, blk_mode_t mode)
489{
490 struct scsi_cd *cd = scsi_cd(disk);
491 struct scsi_device *sdev = cd->device;
492 int ret;
493
494 if (scsi_device_get(cd->device))
495 return -ENXIO;
496
497 scsi_autopm_get_device(sdev);
498 if (disk_check_media_change(disk))
499 sr_revalidate_disk(cd);
500
501 mutex_lock(&cd->lock);
502 ret = cdrom_open(&cd->cdi, mode);
503 mutex_unlock(&cd->lock);
504
505 scsi_autopm_put_device(sdev);
506 if (ret)
507 scsi_device_put(cd->device);
508 return ret;
509}
510
511static void sr_block_release(struct gendisk *disk)
512{
513 struct scsi_cd *cd = scsi_cd(disk);
514
515 mutex_lock(&cd->lock);
516 cdrom_release(&cd->cdi);
517 mutex_unlock(&cd->lock);
518
519 scsi_device_put(cd->device);
520}
521
522static int sr_block_ioctl(struct block_device *bdev, blk_mode_t mode,
523 unsigned cmd, unsigned long arg)
524{
525 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
526 struct scsi_device *sdev = cd->device;
527 void __user *argp = (void __user *)arg;
528 int ret;
529
530 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
531 return -ENOIOCTLCMD;
532
533 mutex_lock(&cd->lock);
534
535 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
536 (mode & BLK_OPEN_NDELAY));
537 if (ret)
538 goto out;
539
540 scsi_autopm_get_device(sdev);
541
542 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) {
543 ret = cdrom_ioctl(&cd->cdi, bdev, cmd, arg);
544 if (ret != -ENOSYS)
545 goto put;
546 }
547 ret = scsi_ioctl(sdev, mode & BLK_OPEN_WRITE, cmd, argp);
548
549put:
550 scsi_autopm_put_device(sdev);
551out:
552 mutex_unlock(&cd->lock);
553 return ret;
554}
555
556static unsigned int sr_block_check_events(struct gendisk *disk,
557 unsigned int clearing)
558{
559 struct scsi_cd *cd = disk->private_data;
560
561 if (atomic_read(&cd->device->disk_events_disable_depth))
562 return 0;
563 return cdrom_check_events(&cd->cdi, clearing);
564}
565
566static void sr_free_disk(struct gendisk *disk)
567{
568 struct scsi_cd *cd = disk->private_data;
569
570 spin_lock(&sr_index_lock);
571 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
572 spin_unlock(&sr_index_lock);
573
574 unregister_cdrom(&cd->cdi);
575 mutex_destroy(&cd->lock);
576 kfree(cd);
577}
578
579static const struct block_device_operations sr_bdops =
580{
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,
588};
589
590static int sr_open(struct cdrom_device_info *cdi, int purpose)
591{
592 struct scsi_cd *cd = cdi->handle;
593 struct scsi_device *sdev = cd->device;
594
595 /*
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.
598 */
599 if (!scsi_block_when_processing_errors(sdev))
600 return -ENXIO;
601
602 return 0;
603}
604
605static void sr_release(struct cdrom_device_info *cdi)
606{
607}
608
609static int sr_probe(struct device *dev)
610{
611 struct scsi_device *sdev = to_scsi_device(dev);
612 struct gendisk *disk;
613 struct scsi_cd *cd;
614 int minor, error;
615
616 scsi_autopm_get_device(sdev);
617 error = -ENODEV;
618 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
619 goto fail;
620
621 error = -ENOMEM;
622 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
623 if (!cd)
624 goto fail;
625
626 disk = blk_mq_alloc_disk_for_queue(sdev->request_queue,
627 &sr_bio_compl_lkclass);
628 if (!disk)
629 goto fail_free;
630 mutex_init(&cd->lock);
631
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);
636 error = -EBUSY;
637 goto fail_put;
638 }
639 __set_bit(minor, sr_index_bits);
640 spin_unlock(&sr_index_lock);
641
642 disk->major = SCSI_CDROM_MAJOR;
643 disk->first_minor = minor;
644 disk->minors = 1;
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;
651
652 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
653
654 cd->device = sdev;
655 cd->disk = disk;
656 cd->capacity = 0x1fffff;
657 cd->device->changed = 1; /* force recheck CD type */
658 cd->media_present = 1;
659 cd->use = 1;
660 cd->readcd_known = 0;
661 cd->readcd_cdda = 0;
662
663 cd->cdi.ops = &sr_dops;
664 cd->cdi.handle = cd;
665 cd->cdi.mask = 0;
666 cd->cdi.capacity = 1;
667 sprintf(cd->cdi.name, "sr%d", minor);
668
669 sdev->sector_size = 2048; /* A guess, just in case */
670
671 error = -ENOMEM;
672 if (get_capabilities(cd))
673 goto fail_minor;
674 sr_vendor_init(cd);
675
676 set_capacity(disk, cd->capacity);
677 disk->private_data = cd;
678
679 if (register_cdrom(disk, &cd->cdi))
680 goto fail_minor;
681
682 /*
683 * Initialize block layer runtime PM stuffs before the
684 * periodic event checking request gets started in add_disk.
685 */
686 blk_pm_runtime_init(sdev->request_queue, dev);
687
688 dev_set_drvdata(dev, cd);
689 sr_revalidate_disk(cd);
690
691 error = device_add_disk(&sdev->sdev_gendev, disk, NULL);
692 if (error)
693 goto unregister_cdrom;
694
695 sdev_printk(KERN_DEBUG, sdev,
696 "Attached scsi CD-ROM %s\n", cd->cdi.name);
697 scsi_autopm_put_device(cd->device);
698
699 return 0;
700
701unregister_cdrom:
702 unregister_cdrom(&cd->cdi);
703fail_minor:
704 spin_lock(&sr_index_lock);
705 clear_bit(minor, sr_index_bits);
706 spin_unlock(&sr_index_lock);
707fail_put:
708 put_disk(disk);
709 mutex_destroy(&cd->lock);
710fail_free:
711 kfree(cd);
712fail:
713 scsi_autopm_put_device(sdev);
714 return error;
715}
716
717
718static void get_sectorsize(struct scsi_cd *cd)
719{
720 unsigned char cmd[10];
721 unsigned char buffer[8];
722 int the_result, retries = 3;
723 int sector_size;
724 struct request_queue *queue;
725
726 do {
727 cmd[0] = READ_CAPACITY;
728 memset((void *) &cmd[1], 0, 9);
729 memset(buffer, 0, sizeof(buffer));
730
731 /* Do the command and wait.. */
732 the_result = scsi_execute_cmd(cd->device, cmd, REQ_OP_DRV_IN,
733 buffer, sizeof(buffer),
734 SR_TIMEOUT, MAX_RETRIES, NULL);
735
736 retries--;
737
738 } while (the_result && retries);
739
740
741 if (the_result) {
742 cd->capacity = 0x1fffff;
743 sector_size = 2048; /* A guess, just in case */
744 } else {
745 long last_written;
746
747 cd->capacity = 1 + get_unaligned_be32(&buffer[0]);
748 /*
749 * READ_CAPACITY doesn't return the correct size on
750 * certain UDF media. If last_written is larger, use
751 * it instead.
752 *
753 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
754 */
755 if (!cdrom_get_last_written(&cd->cdi, &last_written))
756 cd->capacity = max_t(long, cd->capacity, last_written);
757
758 sector_size = get_unaligned_be32(&buffer[4]);
759 switch (sector_size) {
760 /*
761 * HP 4020i CD-Recorder reports 2340 byte sectors
762 * Philips CD-Writers report 2352 byte sectors
763 *
764 * Use 2k sectors for them..
765 */
766 case 0:
767 case 2340:
768 case 2352:
769 sector_size = 2048;
770 fallthrough;
771 case 2048:
772 cd->capacity *= 4;
773 fallthrough;
774 case 512:
775 break;
776 default:
777 sr_printk(KERN_INFO, cd,
778 "unsupported sector size %d.", sector_size);
779 cd->capacity = 0;
780 }
781
782 cd->device->sector_size = sector_size;
783
784 /*
785 * Add this so that we have the ability to correctly gauge
786 * what the device is capable of.
787 */
788 set_capacity(cd->disk, cd->capacity);
789 }
790
791 queue = cd->device->request_queue;
792 blk_queue_logical_block_size(queue, sector_size);
793
794 return;
795}
796
797static int get_capabilities(struct scsi_cd *cd)
798{
799 unsigned char *buffer;
800 struct scsi_mode_data data;
801 struct scsi_sense_hdr sshdr;
802 unsigned int ms_len = 128;
803 int rc, n;
804
805 static const char *loadmech[] =
806 {
807 "caddy",
808 "tray",
809 "pop-up",
810 "",
811 "changer",
812 "cartridge changer",
813 "",
814 ""
815 };
816
817
818 /* allocate transfer buffer */
819 buffer = kmalloc(512, GFP_KERNEL);
820 if (!buffer) {
821 sr_printk(KERN_ERR, cd, "out of memory.\n");
822 return -ENOMEM;
823 }
824
825 /* eat unit attentions */
826 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
827
828 /* ask for mode page 0x2a */
829 rc = scsi_mode_sense(cd->device, 0, 0x2a, 0, buffer, ms_len,
830 SR_TIMEOUT, 3, &data, NULL);
831
832 if (rc < 0 || data.length > ms_len ||
833 data.header_length + data.block_descriptor_length > data.length) {
834 /* failed, drive doesn't have capabilities mode page */
835 cd->cdi.speed = 1;
836 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
837 CDC_DVD | CDC_DVD_RAM |
838 CDC_SELECT_DISC | CDC_SELECT_SPEED |
839 CDC_MRW | CDC_MRW_W | CDC_RAM);
840 kfree(buffer);
841 sr_printk(KERN_INFO, cd, "scsi-1 drive");
842 return 0;
843 }
844
845 n = data.header_length + data.block_descriptor_length;
846 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176;
847 cd->readcd_known = 1;
848 cd->readcd_cdda = buffer[n + 5] & 0x01;
849 /* print some capability bits */
850 sr_printk(KERN_INFO, cd,
851 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
852 get_unaligned_be16(&buffer[n + 14]) / 176,
853 cd->cdi.speed,
854 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
855 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
856 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
857 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
858 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
859 loadmech[buffer[n + 6] >> 5]);
860 if ((buffer[n + 6] >> 5) == 0)
861 /* caddy drives can't close tray... */
862 cd->cdi.mask |= CDC_CLOSE_TRAY;
863 if ((buffer[n + 2] & 0x8) == 0)
864 /* not a DVD drive */
865 cd->cdi.mask |= CDC_DVD;
866 if ((buffer[n + 3] & 0x20) == 0)
867 /* can't write DVD-RAM media */
868 cd->cdi.mask |= CDC_DVD_RAM;
869 if ((buffer[n + 3] & 0x10) == 0)
870 /* can't write DVD-R media */
871 cd->cdi.mask |= CDC_DVD_R;
872 if ((buffer[n + 3] & 0x2) == 0)
873 /* can't write CD-RW media */
874 cd->cdi.mask |= CDC_CD_RW;
875 if ((buffer[n + 3] & 0x1) == 0)
876 /* can't write CD-R media */
877 cd->cdi.mask |= CDC_CD_R;
878 if ((buffer[n + 6] & 0x8) == 0)
879 /* can't eject */
880 cd->cdi.mask |= CDC_OPEN_TRAY;
881
882 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
883 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
884 cd->cdi.capacity =
885 cdrom_number_of_slots(&cd->cdi);
886 if (cd->cdi.capacity <= 1)
887 /* not a changer */
888 cd->cdi.mask |= CDC_SELECT_DISC;
889 /*else I don't think it can close its tray
890 cd->cdi.mask |= CDC_CLOSE_TRAY; */
891
892 /*
893 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
894 */
895 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
896 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
897 cd->writeable = 1;
898 }
899
900 kfree(buffer);
901 return 0;
902}
903
904/*
905 * sr_packet() is the entry point for the generic commands generated
906 * by the Uniform CD-ROM layer.
907 */
908static int sr_packet(struct cdrom_device_info *cdi,
909 struct packet_command *cgc)
910{
911 struct scsi_cd *cd = cdi->handle;
912 struct scsi_device *sdev = cd->device;
913
914 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
915 return -EDRIVE_CANT_DO_THIS;
916
917 if (cgc->timeout <= 0)
918 cgc->timeout = IOCTL_TIMEOUT;
919
920 sr_do_ioctl(cd, cgc);
921
922 return cgc->stat;
923}
924
925static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,
926 u32 lba, u32 nr, u8 *last_sense)
927{
928 struct gendisk *disk = cdi->disk;
929 u32 len = nr * CD_FRAMESIZE_RAW;
930 struct scsi_cmnd *scmd;
931 struct request *rq;
932 struct bio *bio;
933 int ret;
934
935 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0);
936 if (IS_ERR(rq))
937 return PTR_ERR(rq);
938 scmd = blk_mq_rq_to_pdu(rq);
939
940 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL);
941 if (ret)
942 goto out_put_request;
943
944 scmd->cmnd[0] = GPCMD_READ_CD;
945 scmd->cmnd[1] = 1 << 2;
946 scmd->cmnd[2] = (lba >> 24) & 0xff;
947 scmd->cmnd[3] = (lba >> 16) & 0xff;
948 scmd->cmnd[4] = (lba >> 8) & 0xff;
949 scmd->cmnd[5] = lba & 0xff;
950 scmd->cmnd[6] = (nr >> 16) & 0xff;
951 scmd->cmnd[7] = (nr >> 8) & 0xff;
952 scmd->cmnd[8] = nr & 0xff;
953 scmd->cmnd[9] = 0xf8;
954 scmd->cmd_len = 12;
955 rq->timeout = 60 * HZ;
956 bio = rq->bio;
957
958 blk_execute_rq(rq, false);
959 if (scmd->result) {
960 struct scsi_sense_hdr sshdr;
961
962 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,
963 &sshdr);
964 *last_sense = sshdr.sense_key;
965 ret = -EIO;
966 }
967
968 if (blk_rq_unmap_user(bio))
969 ret = -EFAULT;
970out_put_request:
971 blk_mq_free_request(rq);
972 return ret;
973}
974
975static int sr_remove(struct device *dev)
976{
977 struct scsi_cd *cd = dev_get_drvdata(dev);
978
979 scsi_autopm_get_device(cd->device);
980
981 del_gendisk(cd->disk);
982 put_disk(cd->disk);
983
984 return 0;
985}
986
987static int __init init_sr(void)
988{
989 int rc;
990
991 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
992 if (rc)
993 return rc;
994 rc = scsi_register_driver(&sr_template.gendrv);
995 if (rc)
996 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
997
998 return rc;
999}
1000
1001static void __exit exit_sr(void)
1002{
1003 scsi_unregister_driver(&sr_template.gendrv);
1004 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1005}
1006
1007module_init(init_sr);
1008module_exit(exit_sr);
1009MODULE_LICENSE("GPL");