| /* |
| * sr.c Copyright (C) 1992 David Giller |
| * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale |
| * |
| * adapted from: |
| * sd.c Copyright (C) 1992 Drew Eckhardt |
| * Linux scsi disk driver by |
| * Drew Eckhardt <drew@colorado.edu> |
| * |
| * Modified by Eric Youngdale ericy@andante.org to |
| * add scatter-gather, multiple outstanding request, and other |
| * enhancements. |
| * |
| * Modified by Eric Youngdale eric@andante.org to support loadable |
| * low-level scsi drivers. |
| * |
| * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to |
| * provide auto-eject. |
| * |
| * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the |
| * generic cdrom interface |
| * |
| * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() |
| * interface, capabilities probe additions, ioctl cleanups, etc. |
| * |
| * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs |
| * |
| * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM |
| * transparently and lose the GHOST hack |
| * |
| * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| * check resource allocation in sr_init and some cleanups |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/fs.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/bio.h> |
| #include <linux/string.h> |
| #include <linux/errno.h> |
| #include <linux/cdrom.h> |
| #include <linux/interrupt.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <linux/blk-pm.h> |
| #include <linux/mutex.h> |
| #include <linux/slab.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/uaccess.h> |
| |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_dbg.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_driver.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_eh.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ |
| |
| #include "scsi_logging.h" |
| #include "sr.h" |
| |
| |
| MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); |
| MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); |
| MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); |
| |
| #define SR_DISKS 256 |
| |
| #define SR_CAPABILITIES \ |
| (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ |
| CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ |
| CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ |
| CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ |
| CDC_MRW|CDC_MRW_W|CDC_RAM) |
| |
| static DEFINE_MUTEX(sr_mutex); |
| static int sr_probe(struct device *); |
| static int sr_remove(struct device *); |
| static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); |
| static int sr_done(struct scsi_cmnd *); |
| static int sr_runtime_suspend(struct device *dev); |
| |
| static const struct dev_pm_ops sr_pm_ops = { |
| .runtime_suspend = sr_runtime_suspend, |
| }; |
| |
| static struct scsi_driver sr_template = { |
| .gendrv = { |
| .name = "sr", |
| .owner = THIS_MODULE, |
| .probe = sr_probe, |
| .remove = sr_remove, |
| .pm = &sr_pm_ops, |
| }, |
| .init_command = sr_init_command, |
| .done = sr_done, |
| }; |
| |
| static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; |
| static DEFINE_SPINLOCK(sr_index_lock); |
| |
| /* This semaphore is used to mediate the 0->1 reference get in the |
| * face of object destruction (i.e. we can't allow a get on an |
| * object after last put) */ |
| static DEFINE_MUTEX(sr_ref_mutex); |
| |
| static int sr_open(struct cdrom_device_info *, int); |
| static void sr_release(struct cdrom_device_info *); |
| |
| static void get_sectorsize(struct scsi_cd *); |
| static void get_capabilities(struct scsi_cd *); |
| |
| static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
| unsigned int clearing, int slot); |
| static int sr_packet(struct cdrom_device_info *, struct packet_command *); |
| |
| static const struct cdrom_device_ops sr_dops = { |
| .open = sr_open, |
| .release = sr_release, |
| .drive_status = sr_drive_status, |
| .check_events = sr_check_events, |
| .tray_move = sr_tray_move, |
| .lock_door = sr_lock_door, |
| .select_speed = sr_select_speed, |
| .get_last_session = sr_get_last_session, |
| .get_mcn = sr_get_mcn, |
| .reset = sr_reset, |
| .audio_ioctl = sr_audio_ioctl, |
| .capability = SR_CAPABILITIES, |
| .generic_packet = sr_packet, |
| }; |
| |
| static void sr_kref_release(struct kref *kref); |
| |
| static inline struct scsi_cd *scsi_cd(struct gendisk *disk) |
| { |
| return container_of(disk->private_data, struct scsi_cd, driver); |
| } |
| |
| static int sr_runtime_suspend(struct device *dev) |
| { |
| struct scsi_cd *cd = dev_get_drvdata(dev); |
| |
| if (!cd) /* E.g.: runtime suspend following sr_remove() */ |
| return 0; |
| |
| if (cd->media_present) |
| return -EBUSY; |
| else |
| return 0; |
| } |
| |
| /* |
| * The get and put routines for the struct scsi_cd. Note this entity |
| * has a scsi_device pointer and owns a reference to this. |
| */ |
| static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) |
| { |
| struct scsi_cd *cd = NULL; |
| |
| mutex_lock(&sr_ref_mutex); |
| if (disk->private_data == NULL) |
| goto out; |
| cd = scsi_cd(disk); |
| kref_get(&cd->kref); |
| if (scsi_device_get(cd->device)) { |
| kref_put(&cd->kref, sr_kref_release); |
| cd = NULL; |
| } |
| out: |
| mutex_unlock(&sr_ref_mutex); |
| return cd; |
| } |
| |
| static void scsi_cd_put(struct scsi_cd *cd) |
| { |
| struct scsi_device *sdev = cd->device; |
| |
| mutex_lock(&sr_ref_mutex); |
| kref_put(&cd->kref, sr_kref_release); |
| scsi_device_put(sdev); |
| mutex_unlock(&sr_ref_mutex); |
| } |
| |
| static unsigned int sr_get_events(struct scsi_device *sdev) |
| { |
| u8 buf[8]; |
| u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, |
| 1, /* polled */ |
| 0, 0, /* reserved */ |
| 1 << 4, /* notification class: media */ |
| 0, 0, /* reserved */ |
| 0, sizeof(buf), /* allocation length */ |
| 0, /* control */ |
| }; |
| struct event_header *eh = (void *)buf; |
| struct media_event_desc *med = (void *)(buf + 4); |
| struct scsi_sense_hdr sshdr; |
| int result; |
| |
| result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), |
| &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); |
| if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) |
| return DISK_EVENT_MEDIA_CHANGE; |
| |
| if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) |
| return 0; |
| |
| if (eh->nea || eh->notification_class != 0x4) |
| return 0; |
| |
| if (med->media_event_code == 1) |
| return DISK_EVENT_EJECT_REQUEST; |
| else if (med->media_event_code == 2) |
| return DISK_EVENT_MEDIA_CHANGE; |
| return 0; |
| } |
| |
| /* |
| * This function checks to see if the media has been changed or eject |
| * button has been pressed. It is possible that we have already |
| * sensed a change, or the drive may have sensed one and not yet |
| * reported it. The past events are accumulated in sdev->changed and |
| * returned together with the current state. |
| */ |
| static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
| unsigned int clearing, int slot) |
| { |
| struct scsi_cd *cd = cdi->handle; |
| bool last_present; |
| struct scsi_sense_hdr sshdr; |
| unsigned int events; |
| int ret; |
| |
| /* no changer support */ |
| if (CDSL_CURRENT != slot) |
| return 0; |
| |
| events = sr_get_events(cd->device); |
| cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; |
| |
| /* |
| * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree |
| * for several times in a row. We rely on TUR only for this likely |
| * broken device, to prevent generating incorrect media changed |
| * events for every open(). |
| */ |
| if (cd->ignore_get_event) { |
| events &= ~DISK_EVENT_MEDIA_CHANGE; |
| goto do_tur; |
| } |
| |
| /* |
| * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE |
| * is being cleared. Note that there are devices which hang |
| * if asked to execute TUR repeatedly. |
| */ |
| if (cd->device->changed) { |
| events |= DISK_EVENT_MEDIA_CHANGE; |
| cd->device->changed = 0; |
| cd->tur_changed = true; |
| } |
| |
| if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) |
| return events; |
| do_tur: |
| /* let's see whether the media is there with TUR */ |
| last_present = cd->media_present; |
| ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
| |
| /* |
| * Media is considered to be present if TUR succeeds or fails with |
| * sense data indicating something other than media-not-present |
| * (ASC 0x3a). |
| */ |
| cd->media_present = scsi_status_is_good(ret) || |
| (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); |
| |
| if (last_present != cd->media_present) |
| cd->device->changed = 1; |
| |
| if (cd->device->changed) { |
| events |= DISK_EVENT_MEDIA_CHANGE; |
| cd->device->changed = 0; |
| cd->tur_changed = true; |
| } |
| |
| if (cd->ignore_get_event) |
| return events; |
| |
| /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ |
| if (!cd->tur_changed) { |
| if (cd->get_event_changed) { |
| if (cd->tur_mismatch++ > 8) { |
| sr_printk(KERN_WARNING, cd, |
| "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); |
| cd->ignore_get_event = true; |
| } |
| } else { |
| cd->tur_mismatch = 0; |
| } |
| } |
| cd->tur_changed = false; |
| cd->get_event_changed = false; |
| |
| return events; |
| } |
| |
| /* |
| * sr_done is the interrupt routine for the device driver. |
| * |
| * It will be notified on the end of a SCSI read / write, and will take one |
| * of several actions based on success or failure. |
| */ |
| static int sr_done(struct scsi_cmnd *SCpnt) |
| { |
| int result = SCpnt->result; |
| int this_count = scsi_bufflen(SCpnt); |
| int good_bytes = (result == 0 ? this_count : 0); |
| int block_sectors = 0; |
| long error_sector; |
| struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); |
| |
| #ifdef DEBUG |
| scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); |
| #endif |
| |
| /* |
| * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial |
| * success. Since this is a relatively rare error condition, no |
| * care is taken to avoid unnecessary additional work such as |
| * memcpy's that could be avoided. |
| */ |
| if (driver_byte(result) != 0 && /* An error occurred */ |
| (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ |
| switch (SCpnt->sense_buffer[2]) { |
| case MEDIUM_ERROR: |
| case VOLUME_OVERFLOW: |
| case ILLEGAL_REQUEST: |
| if (!(SCpnt->sense_buffer[0] & 0x90)) |
| break; |
| error_sector = (SCpnt->sense_buffer[3] << 24) | |
| (SCpnt->sense_buffer[4] << 16) | |
| (SCpnt->sense_buffer[5] << 8) | |
| SCpnt->sense_buffer[6]; |
| if (SCpnt->request->bio != NULL) |
| block_sectors = |
| bio_sectors(SCpnt->request->bio); |
| if (block_sectors < 4) |
| block_sectors = 4; |
| if (cd->device->sector_size == 2048) |
| error_sector <<= 2; |
| error_sector &= ~(block_sectors - 1); |
| good_bytes = (error_sector - |
| blk_rq_pos(SCpnt->request)) << 9; |
| if (good_bytes < 0 || good_bytes >= this_count) |
| good_bytes = 0; |
| /* |
| * The SCSI specification allows for the value |
| * returned by READ CAPACITY to be up to 75 2K |
| * sectors past the last readable block. |
| * Therefore, if we hit a medium error within the |
| * last 75 2K sectors, we decrease the saved size |
| * value. |
| */ |
| if (error_sector < get_capacity(cd->disk) && |
| cd->capacity - error_sector < 4 * 75) |
| set_capacity(cd->disk, error_sector); |
| break; |
| |
| case RECOVERED_ERROR: |
| good_bytes = this_count; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| return good_bytes; |
| } |
| |
| static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) |
| { |
| int block = 0, this_count, s_size; |
| struct scsi_cd *cd; |
| struct request *rq = SCpnt->request; |
| blk_status_t ret; |
| |
| ret = scsi_init_io(SCpnt); |
| if (ret != BLK_STS_OK) |
| goto out; |
| cd = scsi_cd(rq->rq_disk); |
| |
| /* from here on until we're complete, any goto out |
| * is used for a killable error condition */ |
| ret = BLK_STS_IOERR; |
| |
| SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
| "Doing sr request, block = %d\n", block)); |
| |
| if (!cd->device || !scsi_device_online(cd->device)) { |
| SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
| "Finishing %u sectors\n", blk_rq_sectors(rq))); |
| SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
| "Retry with 0x%p\n", SCpnt)); |
| goto out; |
| } |
| |
| if (cd->device->changed) { |
| /* |
| * quietly refuse to do anything to a changed disc until the |
| * changed bit has been reset |
| */ |
| goto out; |
| } |
| |
| /* |
| * we do lazy blocksize switching (when reading XA sectors, |
| * see CDROMREADMODE2 ioctl) |
| */ |
| s_size = cd->device->sector_size; |
| if (s_size > 2048) { |
| if (!in_interrupt()) |
| sr_set_blocklength(cd, 2048); |
| else |
| scmd_printk(KERN_INFO, SCpnt, |
| "can't switch blocksize: in interrupt\n"); |
| } |
| |
| if (s_size != 512 && s_size != 1024 && s_size != 2048) { |
| scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); |
| goto out; |
| } |
| |
| switch (req_op(rq)) { |
| case REQ_OP_WRITE: |
| if (!cd->writeable) |
| goto out; |
| SCpnt->cmnd[0] = WRITE_10; |
| cd->cdi.media_written = 1; |
| break; |
| case REQ_OP_READ: |
| SCpnt->cmnd[0] = READ_10; |
| break; |
| default: |
| blk_dump_rq_flags(rq, "Unknown sr command"); |
| goto out; |
| } |
| |
| { |
| struct scatterlist *sg; |
| int i, size = 0, sg_count = scsi_sg_count(SCpnt); |
| |
| scsi_for_each_sg(SCpnt, sg, sg_count, i) |
| size += sg->length; |
| |
| if (size != scsi_bufflen(SCpnt)) { |
| scmd_printk(KERN_ERR, SCpnt, |
| "mismatch count %d, bytes %d\n", |
| size, scsi_bufflen(SCpnt)); |
| if (scsi_bufflen(SCpnt) > size) |
| SCpnt->sdb.length = size; |
| } |
| } |
| |
| /* |
| * request doesn't start on hw block boundary, add scatter pads |
| */ |
| if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || |
| (scsi_bufflen(SCpnt) % s_size)) { |
| scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); |
| goto out; |
| } |
| |
| this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); |
| |
| |
| SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
| "%s %d/%u 512 byte blocks.\n", |
| (rq_data_dir(rq) == WRITE) ? |
| "writing" : "reading", |
| this_count, blk_rq_sectors(rq))); |
| |
| SCpnt->cmnd[1] = 0; |
| block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); |
| |
| if (this_count > 0xffff) { |
| this_count = 0xffff; |
| SCpnt->sdb.length = this_count * s_size; |
| } |
| |
| SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
| SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; |
| SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; |
| SCpnt->cmnd[5] = (unsigned char) block & 0xff; |
| SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; |
| SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; |
| SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; |
| |
| /* |
| * We shouldn't disconnect in the middle of a sector, so with a dumb |
| * host adapter, it's safe to assume that we can at least transfer |
| * this many bytes between each connect / disconnect. |
| */ |
| SCpnt->transfersize = cd->device->sector_size; |
| SCpnt->underflow = this_count << 9; |
| SCpnt->allowed = MAX_RETRIES; |
| |
| /* |
| * This indicates that the command is ready from our end to be |
| * queued. |
| */ |
| ret = BLK_STS_OK; |
| out: |
| return ret; |
| } |
| |
| static int sr_block_open(struct block_device *bdev, fmode_t mode) |
| { |
| struct scsi_cd *cd; |
| struct scsi_device *sdev; |
| int ret = -ENXIO; |
| |
| cd = scsi_cd_get(bdev->bd_disk); |
| if (!cd) |
| goto out; |
| |
| sdev = cd->device; |
| scsi_autopm_get_device(sdev); |
| check_disk_change(bdev); |
| |
| mutex_lock(&sr_mutex); |
| ret = cdrom_open(&cd->cdi, bdev, mode); |
| mutex_unlock(&sr_mutex); |
| |
| scsi_autopm_put_device(sdev); |
| if (ret) |
| scsi_cd_put(cd); |
| |
| out: |
| return ret; |
| } |
| |
| static void sr_block_release(struct gendisk *disk, fmode_t mode) |
| { |
| struct scsi_cd *cd = scsi_cd(disk); |
| mutex_lock(&sr_mutex); |
| cdrom_release(&cd->cdi, mode); |
| scsi_cd_put(cd); |
| mutex_unlock(&sr_mutex); |
| } |
| |
| static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
| unsigned long arg) |
| { |
| struct scsi_cd *cd = scsi_cd(bdev->bd_disk); |
| struct scsi_device *sdev = cd->device; |
| void __user *argp = (void __user *)arg; |
| int ret; |
| |
| mutex_lock(&sr_mutex); |
| |
| ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, |
| (mode & FMODE_NDELAY) != 0); |
| if (ret) |
| goto out; |
| |
| scsi_autopm_get_device(sdev); |
| |
| /* |
| * Send SCSI addressing ioctls directly to mid level, send other |
| * ioctls to cdrom/block level. |
| */ |
| switch (cmd) { |
| case SCSI_IOCTL_GET_IDLUN: |
| case SCSI_IOCTL_GET_BUS_NUMBER: |
| ret = scsi_ioctl(sdev, cmd, argp); |
| goto put; |
| } |
| |
| ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); |
| if (ret != -ENOSYS) |
| goto put; |
| |
| ret = scsi_ioctl(sdev, cmd, argp); |
| |
| put: |
| scsi_autopm_put_device(sdev); |
| |
| out: |
| mutex_unlock(&sr_mutex); |
| return ret; |
| } |
| |
| static unsigned int sr_block_check_events(struct gendisk *disk, |
| unsigned int clearing) |
| { |
| unsigned int ret = 0; |
| struct scsi_cd *cd; |
| |
| cd = scsi_cd_get(disk); |
| if (!cd) |
| return 0; |
| |
| if (!atomic_read(&cd->device->disk_events_disable_depth)) |
| ret = cdrom_check_events(&cd->cdi, clearing); |
| |
| scsi_cd_put(cd); |
| return ret; |
| } |
| |
| static int sr_block_revalidate_disk(struct gendisk *disk) |
| { |
| struct scsi_sense_hdr sshdr; |
| struct scsi_cd *cd; |
| |
| cd = scsi_cd_get(disk); |
| if (!cd) |
| return -ENXIO; |
| |
| /* if the unit is not ready, nothing more to do */ |
| if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) |
| goto out; |
| |
| sr_cd_check(&cd->cdi); |
| get_sectorsize(cd); |
| out: |
| scsi_cd_put(cd); |
| return 0; |
| } |
| |
| static const struct block_device_operations sr_bdops = |
| { |
| .owner = THIS_MODULE, |
| .open = sr_block_open, |
| .release = sr_block_release, |
| .ioctl = sr_block_ioctl, |
| .check_events = sr_block_check_events, |
| .revalidate_disk = sr_block_revalidate_disk, |
| /* |
| * No compat_ioctl for now because sr_block_ioctl never |
| * seems to pass arbitrary ioctls down to host drivers. |
| */ |
| }; |
| |
| static int sr_open(struct cdrom_device_info *cdi, int purpose) |
| { |
| struct scsi_cd *cd = cdi->handle; |
| struct scsi_device *sdev = cd->device; |
| int retval; |
| |
| /* |
| * If the device is in error recovery, wait until it is done. |
| * If the device is offline, then disallow any access to it. |
| */ |
| retval = -ENXIO; |
| if (!scsi_block_when_processing_errors(sdev)) |
| goto error_out; |
| |
| return 0; |
| |
| error_out: |
| return retval; |
| } |
| |
| static void sr_release(struct cdrom_device_info *cdi) |
| { |
| struct scsi_cd *cd = cdi->handle; |
| |
| if (cd->device->sector_size > 2048) |
| sr_set_blocklength(cd, 2048); |
| |
| } |
| |
| static int sr_probe(struct device *dev) |
| { |
| struct scsi_device *sdev = to_scsi_device(dev); |
| struct gendisk *disk; |
| struct scsi_cd *cd; |
| int minor, error; |
| |
| scsi_autopm_get_device(sdev); |
| error = -ENODEV; |
| if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) |
| goto fail; |
| |
| error = -ENOMEM; |
| cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
| if (!cd) |
| goto fail; |
| |
| kref_init(&cd->kref); |
| |
| disk = alloc_disk(1); |
| if (!disk) |
| goto fail_free; |
| |
| spin_lock(&sr_index_lock); |
| minor = find_first_zero_bit(sr_index_bits, SR_DISKS); |
| if (minor == SR_DISKS) { |
| spin_unlock(&sr_index_lock); |
| error = -EBUSY; |
| goto fail_put; |
| } |
| __set_bit(minor, sr_index_bits); |
| spin_unlock(&sr_index_lock); |
| |
| disk->major = SCSI_CDROM_MAJOR; |
| disk->first_minor = minor; |
| sprintf(disk->disk_name, "sr%d", minor); |
| disk->fops = &sr_bdops; |
| disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; |
| disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; |
| |
| blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); |
| |
| cd->device = sdev; |
| cd->disk = disk; |
| cd->driver = &sr_template; |
| cd->disk = disk; |
| cd->capacity = 0x1fffff; |
| cd->device->changed = 1; /* force recheck CD type */ |
| cd->media_present = 1; |
| cd->use = 1; |
| cd->readcd_known = 0; |
| cd->readcd_cdda = 0; |
| |
| cd->cdi.ops = &sr_dops; |
| cd->cdi.handle = cd; |
| cd->cdi.mask = 0; |
| cd->cdi.capacity = 1; |
| sprintf(cd->cdi.name, "sr%d", minor); |
| |
| sdev->sector_size = 2048; /* A guess, just in case */ |
| |
| /* FIXME: need to handle a get_capabilities failure properly ?? */ |
| get_capabilities(cd); |
| sr_vendor_init(cd); |
| |
| set_capacity(disk, cd->capacity); |
| disk->private_data = &cd->driver; |
| disk->queue = sdev->request_queue; |
| cd->cdi.disk = disk; |
| |
| if (register_cdrom(&cd->cdi)) |
| goto fail_put; |
| |
| /* |
| * Initialize block layer runtime PM stuffs before the |
| * periodic event checking request gets started in add_disk. |
| */ |
| blk_pm_runtime_init(sdev->request_queue, dev); |
| |
| dev_set_drvdata(dev, cd); |
| disk->flags |= GENHD_FL_REMOVABLE; |
| device_add_disk(&sdev->sdev_gendev, disk, NULL); |
| |
| sdev_printk(KERN_DEBUG, sdev, |
| "Attached scsi CD-ROM %s\n", cd->cdi.name); |
| scsi_autopm_put_device(cd->device); |
| |
| return 0; |
| |
| fail_put: |
| put_disk(disk); |
| fail_free: |
| kfree(cd); |
| fail: |
| scsi_autopm_put_device(sdev); |
| return error; |
| } |
| |
| |
| static void get_sectorsize(struct scsi_cd *cd) |
| { |
| unsigned char cmd[10]; |
| unsigned char buffer[8]; |
| int the_result, retries = 3; |
| int sector_size; |
| struct request_queue *queue; |
| |
| do { |
| cmd[0] = READ_CAPACITY; |
| memset((void *) &cmd[1], 0, 9); |
| memset(buffer, 0, sizeof(buffer)); |
| |
| /* Do the command and wait.. */ |
| the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
| buffer, sizeof(buffer), NULL, |
| SR_TIMEOUT, MAX_RETRIES, NULL); |
| |
| retries--; |
| |
| } while (the_result && retries); |
| |
| |
| if (the_result) { |
| cd->capacity = 0x1fffff; |
| sector_size = 2048; /* A guess, just in case */ |
| } else { |
| long last_written; |
| |
| cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | |
| (buffer[2] << 8) | buffer[3]); |
| /* |
| * READ_CAPACITY doesn't return the correct size on |
| * certain UDF media. If last_written is larger, use |
| * it instead. |
| * |
| * http://bugzilla.kernel.org/show_bug.cgi?id=9668 |
| */ |
| if (!cdrom_get_last_written(&cd->cdi, &last_written)) |
| cd->capacity = max_t(long, cd->capacity, last_written); |
| |
| sector_size = (buffer[4] << 24) | |
| (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; |
| switch (sector_size) { |
| /* |
| * HP 4020i CD-Recorder reports 2340 byte sectors |
| * Philips CD-Writers report 2352 byte sectors |
| * |
| * Use 2k sectors for them.. |
| */ |
| case 0: |
| case 2340: |
| case 2352: |
| sector_size = 2048; |
| /* fall through */ |
| case 2048: |
| cd->capacity *= 4; |
| /* fall through */ |
| case 512: |
| break; |
| default: |
| sr_printk(KERN_INFO, cd, |
| "unsupported sector size %d.", sector_size); |
| cd->capacity = 0; |
| } |
| |
| cd->device->sector_size = sector_size; |
| |
| /* |
| * Add this so that we have the ability to correctly gauge |
| * what the device is capable of. |
| */ |
| set_capacity(cd->disk, cd->capacity); |
| } |
| |
| queue = cd->device->request_queue; |
| blk_queue_logical_block_size(queue, sector_size); |
| |
| return; |
| } |
| |
| static void get_capabilities(struct scsi_cd *cd) |
| { |
| unsigned char *buffer; |
| struct scsi_mode_data data; |
| struct scsi_sense_hdr sshdr; |
| unsigned int ms_len = 128; |
| int rc, n; |
| |
| static const char *loadmech[] = |
| { |
| "caddy", |
| "tray", |
| "pop-up", |
| "", |
| "changer", |
| "cartridge changer", |
| "", |
| "" |
| }; |
| |
| |
| /* allocate transfer buffer */ |
| buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); |
| if (!buffer) { |
| sr_printk(KERN_ERR, cd, "out of memory.\n"); |
| return; |
| } |
| |
| /* eat unit attentions */ |
| scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
| |
| /* ask for mode page 0x2a */ |
| rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, |
| SR_TIMEOUT, 3, &data, NULL); |
| |
| if (!scsi_status_is_good(rc) || data.length > ms_len || |
| data.header_length + data.block_descriptor_length > data.length) { |
| /* failed, drive doesn't have capabilities mode page */ |
| cd->cdi.speed = 1; |
| cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | |
| CDC_DVD | CDC_DVD_RAM | |
| CDC_SELECT_DISC | CDC_SELECT_SPEED | |
| CDC_MRW | CDC_MRW_W | CDC_RAM); |
| kfree(buffer); |
| sr_printk(KERN_INFO, cd, "scsi-1 drive"); |
| return; |
| } |
| |
| n = data.header_length + data.block_descriptor_length; |
| cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; |
| cd->readcd_known = 1; |
| cd->readcd_cdda = buffer[n + 5] & 0x01; |
| /* print some capability bits */ |
| sr_printk(KERN_INFO, cd, |
| "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", |
| ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, |
| cd->cdi.speed, |
| buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ |
| buffer[n + 3] & 0x20 ? "dvd-ram " : "", |
| buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ |
| buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ |
| buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ |
| loadmech[buffer[n + 6] >> 5]); |
| if ((buffer[n + 6] >> 5) == 0) |
| /* caddy drives can't close tray... */ |
| cd->cdi.mask |= CDC_CLOSE_TRAY; |
| if ((buffer[n + 2] & 0x8) == 0) |
| /* not a DVD drive */ |
| cd->cdi.mask |= CDC_DVD; |
| if ((buffer[n + 3] & 0x20) == 0) |
| /* can't write DVD-RAM media */ |
| cd->cdi.mask |= CDC_DVD_RAM; |
| if ((buffer[n + 3] & 0x10) == 0) |
| /* can't write DVD-R media */ |
| cd->cdi.mask |= CDC_DVD_R; |
| if ((buffer[n + 3] & 0x2) == 0) |
| /* can't write CD-RW media */ |
| cd->cdi.mask |= CDC_CD_RW; |
| if ((buffer[n + 3] & 0x1) == 0) |
| /* can't write CD-R media */ |
| cd->cdi.mask |= CDC_CD_R; |
| if ((buffer[n + 6] & 0x8) == 0) |
| /* can't eject */ |
| cd->cdi.mask |= CDC_OPEN_TRAY; |
| |
| if ((buffer[n + 6] >> 5) == mechtype_individual_changer || |
| (buffer[n + 6] >> 5) == mechtype_cartridge_changer) |
| cd->cdi.capacity = |
| cdrom_number_of_slots(&cd->cdi); |
| if (cd->cdi.capacity <= 1) |
| /* not a changer */ |
| cd->cdi.mask |= CDC_SELECT_DISC; |
| /*else I don't think it can close its tray |
| cd->cdi.mask |= CDC_CLOSE_TRAY; */ |
| |
| /* |
| * if DVD-RAM, MRW-W or CD-RW, we are randomly writable |
| */ |
| if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != |
| (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { |
| cd->writeable = 1; |
| } |
| |
| kfree(buffer); |
| } |
| |
| /* |
| * sr_packet() is the entry point for the generic commands generated |
| * by the Uniform CD-ROM layer. |
| */ |
| static int sr_packet(struct cdrom_device_info *cdi, |
| struct packet_command *cgc) |
| { |
| struct scsi_cd *cd = cdi->handle; |
| struct scsi_device *sdev = cd->device; |
| |
| if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) |
| return -EDRIVE_CANT_DO_THIS; |
| |
| if (cgc->timeout <= 0) |
| cgc->timeout = IOCTL_TIMEOUT; |
| |
| sr_do_ioctl(cd, cgc); |
| |
| return cgc->stat; |
| } |
| |
| /** |
| * sr_kref_release - Called to free the scsi_cd structure |
| * @kref: pointer to embedded kref |
| * |
| * sr_ref_mutex must be held entering this routine. Because it is |
| * called on last put, you should always use the scsi_cd_get() |
| * scsi_cd_put() helpers which manipulate the semaphore directly |
| * and never do a direct kref_put(). |
| **/ |
| static void sr_kref_release(struct kref *kref) |
| { |
| struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); |
| struct gendisk *disk = cd->disk; |
| |
| spin_lock(&sr_index_lock); |
| clear_bit(MINOR(disk_devt(disk)), sr_index_bits); |
| spin_unlock(&sr_index_lock); |
| |
| unregister_cdrom(&cd->cdi); |
| |
| disk->private_data = NULL; |
| |
| put_disk(disk); |
| |
| kfree(cd); |
| } |
| |
| static int sr_remove(struct device *dev) |
| { |
| struct scsi_cd *cd = dev_get_drvdata(dev); |
| |
| scsi_autopm_get_device(cd->device); |
| |
| del_gendisk(cd->disk); |
| dev_set_drvdata(dev, NULL); |
| |
| mutex_lock(&sr_ref_mutex); |
| kref_put(&cd->kref, sr_kref_release); |
| mutex_unlock(&sr_ref_mutex); |
| |
| return 0; |
| } |
| |
| static int __init init_sr(void) |
| { |
| int rc; |
| |
| rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); |
| if (rc) |
| return rc; |
| rc = scsi_register_driver(&sr_template.gendrv); |
| if (rc) |
| unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); |
| |
| return rc; |
| } |
| |
| static void __exit exit_sr(void) |
| { |
| scsi_unregister_driver(&sr_template.gendrv); |
| unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); |
| } |
| |
| module_init(init_sr); |
| module_exit(exit_sr); |
| MODULE_LICENSE("GPL"); |