Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19

Linux/drivers/scsi/sr.c

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

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