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