--- /dev/null
+/*
+ * 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");
Code Review / kvmfornfv.git / blobdiff