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 <linux/pm_runtime.h>
49 #include <asm/uaccess.h>
50
51 #include <scsi/scsi.h>
52 #include <scsi/scsi_dbg.h>
53 #include <scsi/scsi_device.h>
54 #include <scsi/scsi_driver.h>
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_eh.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
59
60 #include "scsi_logging.h"
61 #include "sr.h"
62
63
64 MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
65 MODULE_LICENSE("GPL");
66 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
67 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
68 MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
69
70 #define SR_DISKS 256
71
72 #define SR_CAPABILITIES \
73 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
74 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
75 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
76 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
77 CDC_MRW|CDC_MRW_W|CDC_RAM)
78
79 static DEFINE_MUTEX(sr_mutex);
80 static int sr_probe(struct device *);
81 static int sr_remove(struct device *);
82 static int sr_init_command(struct scsi_cmnd *SCpnt);
83 static int sr_done(struct scsi_cmnd *);
84 static int sr_runtime_suspend(struct device *dev);
85
86 static struct dev_pm_ops sr_pm_ops = {
87 .runtime_suspend = sr_runtime_suspend,
88 };
89
90 static struct scsi_driver sr_template = {
91 .gendrv = {
92 .name = "sr",
93 .owner = THIS_MODULE,
94 .probe = sr_probe,
95 .remove = sr_remove,
96 .pm = &sr_pm_ops,
97 },
98 .init_command = sr_init_command,
99 .done = sr_done,
100 };
101
102 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
103 static DEFINE_SPINLOCK(sr_index_lock);
104
105 /* This semaphore is used to mediate the 0->1 reference get in the
106 * face of object destruction (i.e. we can't allow a get on an
107 * object after last put) */
108 static DEFINE_MUTEX(sr_ref_mutex);
109
110 static int sr_open(struct cdrom_device_info *, int);
111 static void sr_release(struct cdrom_device_info *);
112
113 static void get_sectorsize(struct scsi_cd *);
114 static void get_capabilities(struct scsi_cd *);
115
116 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
117 unsigned int clearing, int slot);
118 static int sr_packet(struct cdrom_device_info *, struct packet_command *);
119
120 static struct cdrom_device_ops sr_dops = {
121 .open = sr_open,
122 .release = sr_release,
123 .drive_status = sr_drive_status,
124 .check_events = sr_check_events,
125 .tray_move = sr_tray_move,
126 .lock_door = sr_lock_door,
127 .select_speed = sr_select_speed,
128 .get_last_session = sr_get_last_session,
129 .get_mcn = sr_get_mcn,
130 .reset = sr_reset,
131 .audio_ioctl = sr_audio_ioctl,
132 .capability = SR_CAPABILITIES,
133 .generic_packet = sr_packet,
134 };
135
136 static void sr_kref_release(struct kref *kref);
137
scsi_cd(struct gendisk * disk)138 static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
139 {
140 return container_of(disk->private_data, struct scsi_cd, driver);
141 }
142
sr_runtime_suspend(struct device * dev)143 static int sr_runtime_suspend(struct device *dev)
144 {
145 struct scsi_cd *cd = dev_get_drvdata(dev);
146
147 if (!cd) /* E.g.: runtime suspend following sr_remove() */
148 return 0;
149
150 if (cd->media_present)
151 return -EBUSY;
152 else
153 return 0;
154 }
155
156 /*
157 * The get and put routines for the struct scsi_cd. Note this entity
158 * has a scsi_device pointer and owns a reference to this.
159 */
scsi_cd_get(struct gendisk * disk)160 static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
161 {
162 struct scsi_cd *cd = NULL;
163
164 mutex_lock(&sr_ref_mutex);
165 if (disk->private_data == NULL)
166 goto out;
167 cd = scsi_cd(disk);
168 kref_get(&cd->kref);
169 if (scsi_device_get(cd->device)) {
170 kref_put(&cd->kref, sr_kref_release);
171 cd = NULL;
172 }
173 out:
174 mutex_unlock(&sr_ref_mutex);
175 return cd;
176 }
177
scsi_cd_put(struct scsi_cd * cd)178 static void scsi_cd_put(struct scsi_cd *cd)
179 {
180 struct scsi_device *sdev = cd->device;
181
182 mutex_lock(&sr_ref_mutex);
183 kref_put(&cd->kref, sr_kref_release);
184 scsi_device_put(sdev);
185 mutex_unlock(&sr_ref_mutex);
186 }
187
sr_get_events(struct scsi_device * sdev)188 static unsigned int sr_get_events(struct scsi_device *sdev)
189 {
190 u8 buf[8];
191 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
192 1, /* polled */
193 0, 0, /* reserved */
194 1 << 4, /* notification class: media */
195 0, 0, /* reserved */
196 0, sizeof(buf), /* allocation length */
197 0, /* control */
198 };
199 struct event_header *eh = (void *)buf;
200 struct media_event_desc *med = (void *)(buf + 4);
201 struct scsi_sense_hdr sshdr;
202 int result;
203
204 result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
205 &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
206 if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
207 return DISK_EVENT_MEDIA_CHANGE;
208
209 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
210 return 0;
211
212 if (eh->nea || eh->notification_class != 0x4)
213 return 0;
214
215 if (med->media_event_code == 1)
216 return DISK_EVENT_EJECT_REQUEST;
217 else if (med->media_event_code == 2)
218 return DISK_EVENT_MEDIA_CHANGE;
219 else if (med->media_event_code == 3)
220 return DISK_EVENT_MEDIA_CHANGE;
221 return 0;
222 }
223
224 /*
225 * This function checks to see if the media has been changed or eject
226 * button has been pressed. It is possible that we have already
227 * sensed a change, or the drive may have sensed one and not yet
228 * reported it. The past events are accumulated in sdev->changed and
229 * returned together with the current state.
230 */
sr_check_events(struct cdrom_device_info * cdi,unsigned int clearing,int slot)231 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
232 unsigned int clearing, int slot)
233 {
234 struct scsi_cd *cd = cdi->handle;
235 bool last_present;
236 struct scsi_sense_hdr sshdr;
237 unsigned int events;
238 int ret;
239
240 /* no changer support */
241 if (CDSL_CURRENT != slot)
242 return 0;
243
244 events = sr_get_events(cd->device);
245 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
246
247 /*
248 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
249 * for several times in a row. We rely on TUR only for this likely
250 * broken device, to prevent generating incorrect media changed
251 * events for every open().
252 */
253 if (cd->ignore_get_event) {
254 events &= ~DISK_EVENT_MEDIA_CHANGE;
255 goto do_tur;
256 }
257
258 /*
259 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
260 * is being cleared. Note that there are devices which hang
261 * if asked to execute TUR repeatedly.
262 */
263 if (cd->device->changed) {
264 events |= DISK_EVENT_MEDIA_CHANGE;
265 cd->device->changed = 0;
266 cd->tur_changed = true;
267 }
268
269 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
270 return events;
271 do_tur:
272 /* let's see whether the media is there with TUR */
273 last_present = cd->media_present;
274 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
275
276 /*
277 * Media is considered to be present if TUR succeeds or fails with
278 * sense data indicating something other than media-not-present
279 * (ASC 0x3a).
280 */
281 cd->media_present = scsi_status_is_good(ret) ||
282 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
283
284 if (last_present != cd->media_present)
285 cd->device->changed = 1;
286
287 if (cd->device->changed) {
288 events |= DISK_EVENT_MEDIA_CHANGE;
289 cd->device->changed = 0;
290 cd->tur_changed = true;
291 }
292
293 if (cd->ignore_get_event)
294 return events;
295
296 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
297 if (!cd->tur_changed) {
298 if (cd->get_event_changed) {
299 if (cd->tur_mismatch++ > 8) {
300 sr_printk(KERN_WARNING, cd,
301 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
302 cd->ignore_get_event = true;
303 }
304 } else {
305 cd->tur_mismatch = 0;
306 }
307 }
308 cd->tur_changed = false;
309 cd->get_event_changed = false;
310
311 return events;
312 }
313
314 /*
315 * sr_done is the interrupt routine for the device driver.
316 *
317 * It will be notified on the end of a SCSI read / write, and will take one
318 * of several actions based on success or failure.
319 */
sr_done(struct scsi_cmnd * SCpnt)320 static int sr_done(struct scsi_cmnd *SCpnt)
321 {
322 int result = SCpnt->result;
323 int this_count = scsi_bufflen(SCpnt);
324 int good_bytes = (result == 0 ? this_count : 0);
325 int block_sectors = 0;
326 long error_sector;
327 struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
328
329 #ifdef DEBUG
330 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
331 #endif
332
333 /*
334 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
335 * success. Since this is a relatively rare error condition, no
336 * care is taken to avoid unnecessary additional work such as
337 * memcpy's that could be avoided.
338 */
339 if (driver_byte(result) != 0 && /* An error occurred */
340 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
341 switch (SCpnt->sense_buffer[2]) {
342 case MEDIUM_ERROR:
343 case VOLUME_OVERFLOW:
344 case ILLEGAL_REQUEST:
345 if (!(SCpnt->sense_buffer[0] & 0x90))
346 break;
347 error_sector = (SCpnt->sense_buffer[3] << 24) |
348 (SCpnt->sense_buffer[4] << 16) |
349 (SCpnt->sense_buffer[5] << 8) |
350 SCpnt->sense_buffer[6];
351 if (SCpnt->request->bio != NULL)
352 block_sectors =
353 bio_sectors(SCpnt->request->bio);
354 if (block_sectors < 4)
355 block_sectors = 4;
356 if (cd->device->sector_size == 2048)
357 error_sector <<= 2;
358 error_sector &= ~(block_sectors - 1);
359 good_bytes = (error_sector -
360 blk_rq_pos(SCpnt->request)) << 9;
361 if (good_bytes < 0 || good_bytes >= this_count)
362 good_bytes = 0;
363 /*
364 * The SCSI specification allows for the value
365 * returned by READ CAPACITY to be up to 75 2K
366 * sectors past the last readable block.
367 * Therefore, if we hit a medium error within the
368 * last 75 2K sectors, we decrease the saved size
369 * value.
370 */
371 if (error_sector < get_capacity(cd->disk) &&
372 cd->capacity - error_sector < 4 * 75)
373 set_capacity(cd->disk, error_sector);
374 break;
375
376 case RECOVERED_ERROR:
377 good_bytes = this_count;
378 break;
379
380 default:
381 break;
382 }
383 }
384
385 return good_bytes;
386 }
387
sr_init_command(struct scsi_cmnd * SCpnt)388 static int sr_init_command(struct scsi_cmnd *SCpnt)
389 {
390 int block = 0, this_count, s_size;
391 struct scsi_cd *cd;
392 struct request *rq = SCpnt->request;
393 int ret;
394
395 ret = scsi_init_io(SCpnt);
396 if (ret != BLKPREP_OK)
397 goto out;
398 SCpnt = rq->special;
399 cd = scsi_cd(rq->rq_disk);
400
401 /* from here on until we're complete, any goto out
402 * is used for a killable error condition */
403 ret = BLKPREP_KILL;
404
405 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
406 "Doing sr request, block = %d\n", block));
407
408 if (!cd->device || !scsi_device_online(cd->device)) {
409 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
410 "Finishing %u sectors\n", blk_rq_sectors(rq)));
411 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
412 "Retry with 0x%p\n", SCpnt));
413 goto out;
414 }
415
416 if (cd->device->changed) {
417 /*
418 * quietly refuse to do anything to a changed disc until the
419 * changed bit has been reset
420 */
421 goto out;
422 }
423
424 /*
425 * we do lazy blocksize switching (when reading XA sectors,
426 * see CDROMREADMODE2 ioctl)
427 */
428 s_size = cd->device->sector_size;
429 if (s_size > 2048) {
430 if (!in_interrupt())
431 sr_set_blocklength(cd, 2048);
432 else
433 scmd_printk(KERN_INFO, SCpnt,
434 "can't switch blocksize: in interrupt\n");
435 }
436
437 if (s_size != 512 && s_size != 1024 && s_size != 2048) {
438 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
439 goto out;
440 }
441
442 if (rq_data_dir(rq) == WRITE) {
443 if (!cd->writeable)
444 goto out;
445 SCpnt->cmnd[0] = WRITE_10;
446 cd->cdi.media_written = 1;
447 } else if (rq_data_dir(rq) == READ) {
448 SCpnt->cmnd[0] = READ_10;
449 } else {
450 blk_dump_rq_flags(rq, "Unknown sr command");
451 goto out;
452 }
453
454 {
455 struct scatterlist *sg;
456 int i, size = 0, sg_count = scsi_sg_count(SCpnt);
457
458 scsi_for_each_sg(SCpnt, sg, sg_count, i)
459 size += sg->length;
460
461 if (size != scsi_bufflen(SCpnt)) {
462 scmd_printk(KERN_ERR, SCpnt,
463 "mismatch count %d, bytes %d\n",
464 size, scsi_bufflen(SCpnt));
465 if (scsi_bufflen(SCpnt) > size)
466 SCpnt->sdb.length = size;
467 }
468 }
469
470 /*
471 * request doesn't start on hw block boundary, add scatter pads
472 */
473 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
474 (scsi_bufflen(SCpnt) % s_size)) {
475 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
476 goto out;
477 }
478
479 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
480
481
482 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
483 "%s %d/%u 512 byte blocks.\n",
484 (rq_data_dir(rq) == WRITE) ?
485 "writing" : "reading",
486 this_count, blk_rq_sectors(rq)));
487
488 SCpnt->cmnd[1] = 0;
489 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
490
491 if (this_count > 0xffff) {
492 this_count = 0xffff;
493 SCpnt->sdb.length = this_count * s_size;
494 }
495
496 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
497 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
498 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
499 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
500 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
501 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
502 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
503
504 /*
505 * We shouldn't disconnect in the middle of a sector, so with a dumb
506 * host adapter, it's safe to assume that we can at least transfer
507 * this many bytes between each connect / disconnect.
508 */
509 SCpnt->transfersize = cd->device->sector_size;
510 SCpnt->underflow = this_count << 9;
511 SCpnt->allowed = MAX_RETRIES;
512
513 /*
514 * This indicates that the command is ready from our end to be
515 * queued.
516 */
517 ret = BLKPREP_OK;
518 out:
519 return ret;
520 }
521
sr_block_open(struct block_device * bdev,fmode_t mode)522 static int sr_block_open(struct block_device *bdev, fmode_t mode)
523 {
524 struct scsi_cd *cd;
525 struct scsi_device *sdev;
526 int ret = -ENXIO;
527
528 cd = scsi_cd_get(bdev->bd_disk);
529 if (!cd)
530 goto out;
531
532 sdev = cd->device;
533 scsi_autopm_get_device(sdev);
534 check_disk_change(bdev);
535
536 mutex_lock(&sr_mutex);
537 ret = cdrom_open(&cd->cdi, bdev, mode);
538 mutex_unlock(&sr_mutex);
539
540 scsi_autopm_put_device(sdev);
541 if (ret)
542 scsi_cd_put(cd);
543
544 out:
545 return ret;
546 }
547
sr_block_release(struct gendisk * disk,fmode_t mode)548 static void sr_block_release(struct gendisk *disk, fmode_t mode)
549 {
550 struct scsi_cd *cd = scsi_cd(disk);
551 mutex_lock(&sr_mutex);
552 cdrom_release(&cd->cdi, mode);
553 scsi_cd_put(cd);
554 mutex_unlock(&sr_mutex);
555 }
556
sr_block_ioctl(struct block_device * bdev,fmode_t mode,unsigned cmd,unsigned long arg)557 static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
558 unsigned long arg)
559 {
560 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
561 struct scsi_device *sdev = cd->device;
562 void __user *argp = (void __user *)arg;
563 int ret;
564
565 mutex_lock(&sr_mutex);
566
567 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
568 (mode & FMODE_NDELAY) != 0);
569 if (ret)
570 goto out;
571
572 scsi_autopm_get_device(sdev);
573
574 /*
575 * Send SCSI addressing ioctls directly to mid level, send other
576 * ioctls to cdrom/block level.
577 */
578 switch (cmd) {
579 case SCSI_IOCTL_GET_IDLUN:
580 case SCSI_IOCTL_GET_BUS_NUMBER:
581 ret = scsi_ioctl(sdev, cmd, argp);
582 goto put;
583 }
584
585 ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
586 if (ret != -ENOSYS)
587 goto put;
588
589 ret = scsi_ioctl(sdev, cmd, argp);
590
591 put:
592 scsi_autopm_put_device(sdev);
593
594 out:
595 mutex_unlock(&sr_mutex);
596 return ret;
597 }
598
sr_block_check_events(struct gendisk * disk,unsigned int clearing)599 static unsigned int sr_block_check_events(struct gendisk *disk,
600 unsigned int clearing)
601 {
602 unsigned int ret = 0;
603 struct scsi_cd *cd;
604
605 cd = scsi_cd_get(disk);
606 if (!cd)
607 return 0;
608
609 if (!atomic_read(&cd->device->disk_events_disable_depth))
610 ret = cdrom_check_events(&cd->cdi, clearing);
611
612 scsi_cd_put(cd);
613 return ret;
614 }
615
sr_block_revalidate_disk(struct gendisk * disk)616 static int sr_block_revalidate_disk(struct gendisk *disk)
617 {
618 struct scsi_sense_hdr sshdr;
619 struct scsi_cd *cd;
620
621 cd = scsi_cd_get(disk);
622 if (!cd)
623 return -ENXIO;
624
625 /* if the unit is not ready, nothing more to do */
626 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
627 goto out;
628
629 sr_cd_check(&cd->cdi);
630 get_sectorsize(cd);
631 out:
632 scsi_cd_put(cd);
633 return 0;
634 }
635
636 static const struct block_device_operations sr_bdops =
637 {
638 .owner = THIS_MODULE,
639 .open = sr_block_open,
640 .release = sr_block_release,
641 .ioctl = sr_block_ioctl,
642 .check_events = sr_block_check_events,
643 .revalidate_disk = sr_block_revalidate_disk,
644 /*
645 * No compat_ioctl for now because sr_block_ioctl never
646 * seems to pass arbitrary ioctls down to host drivers.
647 */
648 };
649
sr_open(struct cdrom_device_info * cdi,int purpose)650 static int sr_open(struct cdrom_device_info *cdi, int purpose)
651 {
652 struct scsi_cd *cd = cdi->handle;
653 struct scsi_device *sdev = cd->device;
654 int retval;
655
656 /*
657 * If the device is in error recovery, wait until it is done.
658 * If the device is offline, then disallow any access to it.
659 */
660 retval = -ENXIO;
661 if (!scsi_block_when_processing_errors(sdev))
662 goto error_out;
663
664 return 0;
665
666 error_out:
667 return retval;
668 }
669
sr_release(struct cdrom_device_info * cdi)670 static void sr_release(struct cdrom_device_info *cdi)
671 {
672 struct scsi_cd *cd = cdi->handle;
673
674 if (cd->device->sector_size > 2048)
675 sr_set_blocklength(cd, 2048);
676
677 }
678
sr_probe(struct device * dev)679 static int sr_probe(struct device *dev)
680 {
681 struct scsi_device *sdev = to_scsi_device(dev);
682 struct gendisk *disk;
683 struct scsi_cd *cd;
684 int minor, error;
685
686 scsi_autopm_get_device(sdev);
687 error = -ENODEV;
688 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
689 goto fail;
690
691 error = -ENOMEM;
692 cd = kzalloc(sizeof(*cd), GFP_KERNEL);
693 if (!cd)
694 goto fail;
695
696 kref_init(&cd->kref);
697
698 disk = alloc_disk(1);
699 if (!disk)
700 goto fail_free;
701
702 spin_lock(&sr_index_lock);
703 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
704 if (minor == SR_DISKS) {
705 spin_unlock(&sr_index_lock);
706 error = -EBUSY;
707 goto fail_put;
708 }
709 __set_bit(minor, sr_index_bits);
710 spin_unlock(&sr_index_lock);
711
712 disk->major = SCSI_CDROM_MAJOR;
713 disk->first_minor = minor;
714 sprintf(disk->disk_name, "sr%d", minor);
715 disk->fops = &sr_bdops;
716 disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
717 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
718
719 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
720
721 cd->device = sdev;
722 cd->disk = disk;
723 cd->driver = &sr_template;
724 cd->disk = disk;
725 cd->capacity = 0x1fffff;
726 cd->device->changed = 1; /* force recheck CD type */
727 cd->media_present = 1;
728 cd->use = 1;
729 cd->readcd_known = 0;
730 cd->readcd_cdda = 0;
731
732 cd->cdi.ops = &sr_dops;
733 cd->cdi.handle = cd;
734 cd->cdi.mask = 0;
735 cd->cdi.capacity = 1;
736 sprintf(cd->cdi.name, "sr%d", minor);
737
738 sdev->sector_size = 2048; /* A guess, just in case */
739
740 /* FIXME: need to handle a get_capabilities failure properly ?? */
741 get_capabilities(cd);
742 sr_vendor_init(cd);
743
744 disk->driverfs_dev = &sdev->sdev_gendev;
745 set_capacity(disk, cd->capacity);
746 disk->private_data = &cd->driver;
747 disk->queue = sdev->request_queue;
748 cd->cdi.disk = disk;
749
750 if (register_cdrom(&cd->cdi))
751 goto fail_minor;
752
753 /*
754 * Initialize block layer runtime PM stuffs before the
755 * periodic event checking request gets started in add_disk.
756 */
757 blk_pm_runtime_init(sdev->request_queue, dev);
758
759 dev_set_drvdata(dev, cd);
760 disk->flags |= GENHD_FL_REMOVABLE;
761 add_disk(disk);
762
763 sdev_printk(KERN_DEBUG, sdev,
764 "Attached scsi CD-ROM %s\n", cd->cdi.name);
765 scsi_autopm_put_device(cd->device);
766
767 return 0;
768
769 fail_minor:
770 spin_lock(&sr_index_lock);
771 clear_bit(minor, sr_index_bits);
772 spin_unlock(&sr_index_lock);
773 fail_put:
774 put_disk(disk);
775 fail_free:
776 kfree(cd);
777 fail:
778 scsi_autopm_put_device(sdev);
779 return error;
780 }
781
782
get_sectorsize(struct scsi_cd * cd)783 static void get_sectorsize(struct scsi_cd *cd)
784 {
785 unsigned char cmd[10];
786 unsigned char buffer[8];
787 int the_result, retries = 3;
788 int sector_size;
789 struct request_queue *queue;
790
791 do {
792 cmd[0] = READ_CAPACITY;
793 memset((void *) &cmd[1], 0, 9);
794 memset(buffer, 0, sizeof(buffer));
795
796 /* Do the command and wait.. */
797 the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
798 buffer, sizeof(buffer), NULL,
799 SR_TIMEOUT, MAX_RETRIES, NULL);
800
801 retries--;
802
803 } while (the_result && retries);
804
805
806 if (the_result) {
807 cd->capacity = 0x1fffff;
808 sector_size = 2048; /* A guess, just in case */
809 } else {
810 long last_written;
811
812 cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) |
813 (buffer[2] << 8) | buffer[3]);
814 /*
815 * READ_CAPACITY doesn't return the correct size on
816 * certain UDF media. If last_written is larger, use
817 * it instead.
818 *
819 * http://bugzilla.kernel.org/show_bug.cgi?id=9668
820 */
821 if (!cdrom_get_last_written(&cd->cdi, &last_written))
822 cd->capacity = max_t(long, cd->capacity, last_written);
823
824 sector_size = (buffer[4] << 24) |
825 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
826 switch (sector_size) {
827 /*
828 * HP 4020i CD-Recorder reports 2340 byte sectors
829 * Philips CD-Writers report 2352 byte sectors
830 *
831 * Use 2k sectors for them..
832 */
833 case 0:
834 case 2340:
835 case 2352:
836 sector_size = 2048;
837 /* fall through */
838 case 2048:
839 cd->capacity *= 4;
840 /* fall through */
841 case 512:
842 break;
843 default:
844 sr_printk(KERN_INFO, cd,
845 "unsupported sector size %d.", sector_size);
846 cd->capacity = 0;
847 }
848
849 cd->device->sector_size = sector_size;
850
851 /*
852 * Add this so that we have the ability to correctly gauge
853 * what the device is capable of.
854 */
855 set_capacity(cd->disk, cd->capacity);
856 }
857
858 queue = cd->device->request_queue;
859 blk_queue_logical_block_size(queue, sector_size);
860
861 return;
862 }
863
get_capabilities(struct scsi_cd * cd)864 static void get_capabilities(struct scsi_cd *cd)
865 {
866 unsigned char *buffer;
867 struct scsi_mode_data data;
868 struct scsi_sense_hdr sshdr;
869 unsigned int ms_len = 128;
870 int rc, n;
871
872 static const char *loadmech[] =
873 {
874 "caddy",
875 "tray",
876 "pop-up",
877 "",
878 "changer",
879 "cartridge changer",
880 "",
881 ""
882 };
883
884
885 /* allocate transfer buffer */
886 buffer = kmalloc(512, GFP_KERNEL);
887 if (!buffer) {
888 sr_printk(KERN_ERR, cd, "out of memory.\n");
889 return;
890 }
891
892 /* eat unit attentions */
893 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
894
895 /* ask for mode page 0x2a */
896 rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len,
897 SR_TIMEOUT, 3, &data, NULL);
898
899 if (!scsi_status_is_good(rc) || data.length > ms_len ||
900 data.header_length + data.block_descriptor_length > data.length) {
901 /* failed, drive doesn't have capabilities mode page */
902 cd->cdi.speed = 1;
903 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
904 CDC_DVD | CDC_DVD_RAM |
905 CDC_SELECT_DISC | CDC_SELECT_SPEED |
906 CDC_MRW | CDC_MRW_W | CDC_RAM);
907 kfree(buffer);
908 sr_printk(KERN_INFO, cd, "scsi-1 drive");
909 return;
910 }
911
912 n = data.header_length + data.block_descriptor_length;
913 cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
914 cd->readcd_known = 1;
915 cd->readcd_cdda = buffer[n + 5] & 0x01;
916 /* print some capability bits */
917 sr_printk(KERN_INFO, cd,
918 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
919 ((buffer[n + 14] << 8) + buffer[n + 15]) / 176,
920 cd->cdi.speed,
921 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
922 buffer[n + 3] & 0x20 ? "dvd-ram " : "",
923 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
924 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
925 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
926 loadmech[buffer[n + 6] >> 5]);
927 if ((buffer[n + 6] >> 5) == 0)
928 /* caddy drives can't close tray... */
929 cd->cdi.mask |= CDC_CLOSE_TRAY;
930 if ((buffer[n + 2] & 0x8) == 0)
931 /* not a DVD drive */
932 cd->cdi.mask |= CDC_DVD;
933 if ((buffer[n + 3] & 0x20) == 0)
934 /* can't write DVD-RAM media */
935 cd->cdi.mask |= CDC_DVD_RAM;
936 if ((buffer[n + 3] & 0x10) == 0)
937 /* can't write DVD-R media */
938 cd->cdi.mask |= CDC_DVD_R;
939 if ((buffer[n + 3] & 0x2) == 0)
940 /* can't write CD-RW media */
941 cd->cdi.mask |= CDC_CD_RW;
942 if ((buffer[n + 3] & 0x1) == 0)
943 /* can't write CD-R media */
944 cd->cdi.mask |= CDC_CD_R;
945 if ((buffer[n + 6] & 0x8) == 0)
946 /* can't eject */
947 cd->cdi.mask |= CDC_OPEN_TRAY;
948
949 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
950 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)
951 cd->cdi.capacity =
952 cdrom_number_of_slots(&cd->cdi);
953 if (cd->cdi.capacity <= 1)
954 /* not a changer */
955 cd->cdi.mask |= CDC_SELECT_DISC;
956 /*else I don't think it can close its tray
957 cd->cdi.mask |= CDC_CLOSE_TRAY; */
958
959 /*
960 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable
961 */
962 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
963 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
964 cd->writeable = 1;
965 }
966
967 kfree(buffer);
968 }
969
970 /*
971 * sr_packet() is the entry point for the generic commands generated
972 * by the Uniform CD-ROM layer.
973 */
sr_packet(struct cdrom_device_info * cdi,struct packet_command * cgc)974 static int sr_packet(struct cdrom_device_info *cdi,
975 struct packet_command *cgc)
976 {
977 struct scsi_cd *cd = cdi->handle;
978 struct scsi_device *sdev = cd->device;
979
980 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
981 return -EDRIVE_CANT_DO_THIS;
982
983 if (cgc->timeout <= 0)
984 cgc->timeout = IOCTL_TIMEOUT;
985
986 sr_do_ioctl(cd, cgc);
987
988 return cgc->stat;
989 }
990
991 /**
992 * sr_kref_release - Called to free the scsi_cd structure
993 * @kref: pointer to embedded kref
994 *
995 * sr_ref_mutex must be held entering this routine. Because it is
996 * called on last put, you should always use the scsi_cd_get()
997 * scsi_cd_put() helpers which manipulate the semaphore directly
998 * and never do a direct kref_put().
999 **/
sr_kref_release(struct kref * kref)1000 static void sr_kref_release(struct kref *kref)
1001 {
1002 struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
1003 struct gendisk *disk = cd->disk;
1004
1005 spin_lock(&sr_index_lock);
1006 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
1007 spin_unlock(&sr_index_lock);
1008
1009 unregister_cdrom(&cd->cdi);
1010
1011 disk->private_data = NULL;
1012
1013 put_disk(disk);
1014
1015 kfree(cd);
1016 }
1017
sr_remove(struct device * dev)1018 static int sr_remove(struct device *dev)
1019 {
1020 struct scsi_cd *cd = dev_get_drvdata(dev);
1021
1022 scsi_autopm_get_device(cd->device);
1023
1024 del_gendisk(cd->disk);
1025 dev_set_drvdata(dev, NULL);
1026
1027 mutex_lock(&sr_ref_mutex);
1028 kref_put(&cd->kref, sr_kref_release);
1029 mutex_unlock(&sr_ref_mutex);
1030
1031 return 0;
1032 }
1033
init_sr(void)1034 static int __init init_sr(void)
1035 {
1036 int rc;
1037
1038 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
1039 if (rc)
1040 return rc;
1041 rc = scsi_register_driver(&sr_template.gendrv);
1042 if (rc)
1043 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1044
1045 return rc;
1046 }
1047
exit_sr(void)1048 static void __exit exit_sr(void)
1049 {
1050 scsi_unregister_driver(&sr_template.gendrv);
1051 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1052 }
1053
1054 module_init(init_sr);
1055 module_exit(exit_sr);
1056 MODULE_LICENSE("GPL");
1057