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
63 MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
64 MODULE_LICENSE("GPL");
65 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
66 MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
67 MODULE_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
78 static DEFINE_MUTEX(sr_mutex);
79 static int sr_probe(struct device *);
80 static int sr_remove(struct device *);
81 static int sr_done(struct scsi_cmnd *);
82
83 static 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
93 static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
94 static 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) */
99 static DEFINE_MUTEX(sr_ref_mutex);
100
101 static int sr_open(struct cdrom_device_info *, int);
102 static void sr_release(struct cdrom_device_info *);
103
104 static void get_sectorsize(struct scsi_cd *);
105 static void get_capabilities(struct scsi_cd *);
106
107 static unsigned int sr_check_events(struct cdrom_device_info *cdi,
108 unsigned int clearing, int slot);
109 static int sr_packet(struct cdrom_device_info *, struct packet_command *);
110
111 static 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
127 static void sr_kref_release(struct kref *kref);
128
scsi_cd(struct gendisk * disk)129 static 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 */
scsi_cd_get(struct gendisk * disk)138 static 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
scsi_cd_put(struct scsi_cd * cd)159 static 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
sr_get_events(struct scsi_device * sdev)169 static 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 */
sr_check_events(struct cdrom_device_info * cdi,unsigned int clearing,int slot)210 static 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;
250 do_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 */
sr_done(struct scsi_cmnd * SCpnt)299 static 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
sr_prep_fn(struct request_queue * q,struct request * rq)367 static 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
sr_block_open(struct block_device * bdev,fmode_t mode)509 static 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
sr_block_release(struct gendisk * disk,fmode_t mode)525 static 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
sr_block_ioctl(struct block_device * bdev,fmode_t mode,unsigned cmd,unsigned long arg)535 static 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
572 out:
573 mutex_unlock(&sr_mutex);
574 return ret;
575 }
576
sr_block_check_events(struct gendisk * disk,unsigned int clearing)577 static 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
sr_block_revalidate_disk(struct gendisk * disk)584 static 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
598 static 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
sr_open(struct cdrom_device_info * cdi,int purpose)612 static 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
628 error_out:
629 return retval;
630 }
631
sr_release(struct cdrom_device_info * cdi)632 static 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
sr_probe(struct device * dev)641 static 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
723 fail_put:
724 put_disk(disk);
725 fail_free:
726 kfree(cd);
727 fail:
728 return error;
729 }
730
731
get_sectorsize(struct scsi_cd * cd)732 static 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
get_capabilities(struct scsi_cd * cd)813 static 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 */
sr_packet(struct cdrom_device_info * cdi,struct packet_command * cgc)920 static 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 **/
sr_kref_release(struct kref * kref)946 static 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
sr_remove(struct device * dev)964 static 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
init_sr(void)978 static 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
exit_sr(void)992 static void __exit exit_sr(void)
993 {
994 scsi_unregister_driver(&sr_template.gendrv);
995 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
996 }
997
998 module_init(init_sr);
999 module_exit(exit_sr);
1000 MODULE_LICENSE("GPL");
1001