diff options
Diffstat (limited to 'drivers/scsi/sr.c')
| -rw-r--r-- | drivers/scsi/sr.c | 1018 |
1 files changed, 1018 insertions, 0 deletions
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c new file mode 100644 index 000000000..8bd54a64e --- /dev/null +++ b/drivers/scsi/sr.c @@ -0,0 +1,1018 @@ +/* + * 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/mutex.h> +#include <linux/slab.h> +#include <linux/pm_runtime.h> +#include <asm/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 int sr_init_command(struct scsi_cmnd *SCpnt); +static int sr_done(struct scsi_cmnd *); +static int sr_runtime_suspend(struct device *dev); + +static 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 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->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 int sr_init_command(struct scsi_cmnd *SCpnt) +{ + int block = 0, this_count, s_size; + struct scsi_cd *cd; + struct request *rq = SCpnt->request; + int ret; + + ret = scsi_init_io(SCpnt); + if (ret != BLKPREP_OK) + goto out; + SCpnt = rq->special; + cd = scsi_cd(rq->rq_disk); + + /* from here on until we're complete, any goto out + * is used for a killable error condition */ + ret = BLKPREP_KILL; + + 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; + } + + if (rq_data_dir(rq) == WRITE) { + if (!cd->writeable) + goto out; + SCpnt->cmnd[0] = WRITE_10; + cd->cdi.media_written = 1; + } else if (rq_data_dir(rq) == READ) { + SCpnt->cmnd[0] = READ_10; + } else { + 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 = BLKPREP_OK; + out: + return ret; +} + +static int sr_block_open(struct block_device *bdev, fmode_t mode) +{ + struct scsi_cd *cd; + int ret = -ENXIO; + + mutex_lock(&sr_mutex); + cd = scsi_cd_get(bdev->bd_disk); + if (cd) { + ret = cdrom_open(&cd->cdi, bdev, mode); + if (ret) + scsi_cd_put(cd); + } + mutex_unlock(&sr_mutex); + 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; + + /* + * 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 out; + } + + ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); + if (ret != -ENOSYS) + goto out; + + ret = scsi_ioctl(sdev, cmd, argp); + +out: + mutex_unlock(&sr_mutex); + return ret; +} + +static unsigned int sr_block_check_events(struct gendisk *disk, + unsigned int clearing) +{ + struct scsi_cd *cd = scsi_cd(disk); + + if (atomic_read(&cd->device->disk_events_disable_depth)) + return 0; + + return cdrom_check_events(&cd->cdi, clearing); +} + +static int sr_block_revalidate_disk(struct gendisk *disk) +{ + struct scsi_cd *cd = scsi_cd(disk); + struct scsi_sense_hdr sshdr; + + /* 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: + 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); + + disk->driverfs_dev = &sdev->sdev_gendev; + 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; + add_disk(disk); + + 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; + 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, 128, + SR_TIMEOUT, 3, &data, NULL); + + if (!scsi_status_is_good(rc)) { + /* 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); + + 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"); |