source: src/linux/universal/linux-3.18/drivers/scsi/sr.c @ 31885

Last change on this file since 31885 was 31885, checked in by brainslayer, 5 weeks ago

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1/*
2 *  sr.c Copyright (C) 1992 David Giller
3 *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 *  adapted from:
6 *      sd.c Copyright (C) 1992 Drew Eckhardt
7 *      Linux scsi disk driver by
8 *              Drew Eckhardt <drew@colorado.edu>
9 *
10 *      Modified by Eric Youngdale ericy@andante.org to
11 *      add scatter-gather, multiple outstanding request, and other
12 *      enhancements.
13 *
14 *      Modified by Eric Youngdale eric@andante.org to support loadable
15 *      low-level scsi drivers.
16 *
17 *      Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
18 *      provide auto-eject.
19 *
20 *      Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
21 *      generic cdrom interface
22 *
23 *      Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
24 *      interface, capabilities probe additions, ioctl cleanups, etc.
25 *
26 *      Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
27 *
28 *      Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
29 *      transparently and lose the GHOST hack
30 *
31 *      Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
32 *      check resource allocation in sr_init and some cleanups
33 */
34
35#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/kernel.h>
38#include <linux/mm.h>
39#include <linux/bio.h>
40#include <linux/string.h>
41#include <linux/errno.h>
42#include <linux/cdrom.h>
43#include <linux/interrupt.h>
44#include <linux/init.h>
45#include <linux/blkdev.h>
46#include <linux/mutex.h>
47#include <linux/slab.h>
48#include <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
64MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
65MODULE_LICENSE("GPL");
66MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
67MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
68MODULE_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
79static DEFINE_MUTEX(sr_mutex);
80static int sr_probe(struct device *);
81static int sr_remove(struct device *);
82static int sr_init_command(struct scsi_cmnd *SCpnt);
83static int sr_done(struct scsi_cmnd *);
84static int sr_runtime_suspend(struct device *dev);
85
86static struct dev_pm_ops sr_pm_ops = {
87        .runtime_suspend        = sr_runtime_suspend,
88};
89
90static 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
102static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
103static 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) */
108static DEFINE_MUTEX(sr_ref_mutex);
109
110static int sr_open(struct cdrom_device_info *, int);
111static void sr_release(struct cdrom_device_info *);
112
113static void get_sectorsize(struct scsi_cd *);
114static void get_capabilities(struct scsi_cd *);
115
116static unsigned int sr_check_events(struct cdrom_device_info *cdi,
117                                    unsigned int clearing, int slot);
118static int sr_packet(struct cdrom_device_info *, struct packet_command *);
119
120static 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
136static void sr_kref_release(struct kref *kref);
137
138static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
139{
140        return container_of(disk->private_data, struct scsi_cd, driver);
141}
142
143static 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 */
160static 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
178static 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
188static 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 */
229static 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;
269do_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 */
318static 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
386static 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
520static 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
536static 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
545static 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
582out:
583        mutex_unlock(&sr_mutex);
584        return ret;
585}
586
587static 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
598static 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);
609out:
610        return 0;
611}
612
613static 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
627static 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
643error_out:
644        return retval; 
645}
646
647static 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
656static 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
746fail_put:
747        put_disk(disk);
748fail_free:
749        kfree(cd);
750fail:
751        scsi_autopm_put_device(sdev);
752        return error;
753}
754
755
756static 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
837static 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 */
947static 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 **/
973static 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
991static 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
1007static 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
1021static void __exit exit_sr(void)
1022{
1023        scsi_unregister_driver(&sr_template.gendrv);
1024        unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
1025}
1026
1027module_init(init_sr);
1028module_exit(exit_sr);
1029MODULE_LICENSE("GPL");
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