zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/block/virtio_blk.c b/ap/os/linux/linux-3.4.x/drivers/block/virtio_blk.c
new file mode 100644
index 0000000..98bb43f
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/block/virtio_blk.c
@@ -0,0 +1,710 @@
+//#define DEBUG
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/virtio.h>
+#include <linux/virtio_blk.h>
+#include <linux/scatterlist.h>
+#include <linux/string_helpers.h>
+#include <scsi/scsi_cmnd.h>
+#include <linux/idr.h>
+
+#define PART_BITS 4
+
+static int major;
+static DEFINE_IDA(vd_index_ida);
+
+struct workqueue_struct *virtblk_wq;
+
+struct virtio_blk
+{
+ struct virtio_device *vdev;
+ struct virtqueue *vq;
+
+ /* The disk structure for the kernel. */
+ struct gendisk *disk;
+
+ mempool_t *pool;
+
+ /* Process context for config space updates */
+ struct work_struct config_work;
+
+ /* Lock for config space updates */
+ struct mutex config_lock;
+
+ /* enable config space updates */
+ bool config_enable;
+
+ /* What host tells us, plus 2 for header & tailer. */
+ unsigned int sg_elems;
+
+ /* Ida index - used to track minor number allocations. */
+ int index;
+
+ /* Scatterlist: can be too big for stack. */
+ struct scatterlist sg[/*sg_elems*/];
+};
+
+struct virtblk_req
+{
+ struct request *req;
+ struct virtio_blk_outhdr out_hdr;
+ struct virtio_scsi_inhdr in_hdr;
+ u8 status;
+};
+
+static void blk_done(struct virtqueue *vq)
+{
+ struct virtio_blk *vblk = vq->vdev->priv;
+ struct virtblk_req *vbr;
+ unsigned int len;
+ unsigned long flags;
+
+ spin_lock_irqsave(vblk->disk->queue->queue_lock, flags);
+ while ((vbr = virtqueue_get_buf(vblk->vq, &len)) != NULL) {
+ int error;
+
+ switch (vbr->status) {
+ case VIRTIO_BLK_S_OK:
+ error = 0;
+ break;
+ case VIRTIO_BLK_S_UNSUPP:
+ error = -ENOTTY;
+ break;
+ default:
+ error = -EIO;
+ break;
+ }
+
+ switch (vbr->req->cmd_type) {
+ case REQ_TYPE_BLOCK_PC:
+ vbr->req->resid_len = vbr->in_hdr.residual;
+ vbr->req->sense_len = vbr->in_hdr.sense_len;
+ vbr->req->errors = vbr->in_hdr.errors;
+ break;
+ case REQ_TYPE_SPECIAL:
+ vbr->req->errors = (error != 0);
+ break;
+ default:
+ break;
+ }
+
+ __blk_end_request_all(vbr->req, error);
+ mempool_free(vbr, vblk->pool);
+ }
+ /* In case queue is stopped waiting for more buffers. */
+ blk_start_queue(vblk->disk->queue);
+ spin_unlock_irqrestore(vblk->disk->queue->queue_lock, flags);
+}
+
+static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
+ struct request *req)
+{
+ unsigned long num, out = 0, in = 0;
+ struct virtblk_req *vbr;
+
+ vbr = mempool_alloc(vblk->pool, GFP_ATOMIC);
+ if (!vbr)
+ /* When another request finishes we'll try again. */
+ return false;
+
+ vbr->req = req;
+
+ if (req->cmd_flags & REQ_FLUSH) {
+ vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH;
+ vbr->out_hdr.sector = 0;
+ vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
+ } else {
+ switch (req->cmd_type) {
+ case REQ_TYPE_FS:
+ vbr->out_hdr.type = 0;
+ vbr->out_hdr.sector = blk_rq_pos(vbr->req);
+ vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
+ break;
+ case REQ_TYPE_BLOCK_PC:
+ vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
+ vbr->out_hdr.sector = 0;
+ vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
+ break;
+ case REQ_TYPE_SPECIAL:
+ vbr->out_hdr.type = VIRTIO_BLK_T_GET_ID;
+ vbr->out_hdr.sector = 0;
+ vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
+ break;
+ default:
+ /* We don't put anything else in the queue. */
+ BUG();
+ }
+ }
+
+ sg_set_buf(&vblk->sg[out++], &vbr->out_hdr, sizeof(vbr->out_hdr));
+
+ /*
+ * If this is a packet command we need a couple of additional headers.
+ * Behind the normal outhdr we put a segment with the scsi command
+ * block, and before the normal inhdr we put the sense data and the
+ * inhdr with additional status information before the normal inhdr.
+ */
+ if (vbr->req->cmd_type == REQ_TYPE_BLOCK_PC)
+ sg_set_buf(&vblk->sg[out++], vbr->req->cmd, vbr->req->cmd_len);
+
+ num = blk_rq_map_sg(q, vbr->req, vblk->sg + out);
+
+ if (vbr->req->cmd_type == REQ_TYPE_BLOCK_PC) {
+ sg_set_buf(&vblk->sg[num + out + in++], vbr->req->sense, SCSI_SENSE_BUFFERSIZE);
+ sg_set_buf(&vblk->sg[num + out + in++], &vbr->in_hdr,
+ sizeof(vbr->in_hdr));
+ }
+
+ sg_set_buf(&vblk->sg[num + out + in++], &vbr->status,
+ sizeof(vbr->status));
+
+ if (num) {
+ if (rq_data_dir(vbr->req) == WRITE) {
+ vbr->out_hdr.type |= VIRTIO_BLK_T_OUT;
+ out += num;
+ } else {
+ vbr->out_hdr.type |= VIRTIO_BLK_T_IN;
+ in += num;
+ }
+ }
+
+ if (virtqueue_add_buf(vblk->vq, vblk->sg, out, in, vbr, GFP_ATOMIC)<0) {
+ mempool_free(vbr, vblk->pool);
+ return false;
+ }
+
+ return true;
+}
+
+static void do_virtblk_request(struct request_queue *q)
+{
+ struct virtio_blk *vblk = q->queuedata;
+ struct request *req;
+ unsigned int issued = 0;
+
+ while ((req = blk_peek_request(q)) != NULL) {
+ BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
+
+ /* If this request fails, stop queue and wait for something to
+ finish to restart it. */
+ if (!do_req(q, vblk, req)) {
+ blk_stop_queue(q);
+ break;
+ }
+ blk_start_request(req);
+ issued++;
+ }
+
+ if (issued)
+ virtqueue_kick(vblk->vq);
+}
+
+/* return id (s/n) string for *disk to *id_str
+ */
+static int virtblk_get_id(struct gendisk *disk, char *id_str)
+{
+ struct virtio_blk *vblk = disk->private_data;
+ struct request *req;
+ struct bio *bio;
+ int err;
+
+ bio = bio_map_kern(vblk->disk->queue, id_str, VIRTIO_BLK_ID_BYTES,
+ GFP_KERNEL);
+ if (IS_ERR(bio))
+ return PTR_ERR(bio);
+
+ req = blk_make_request(vblk->disk->queue, bio, GFP_KERNEL);
+ if (IS_ERR(req)) {
+ bio_put(bio);
+ return PTR_ERR(req);
+ }
+
+ req->cmd_type = REQ_TYPE_SPECIAL;
+ err = blk_execute_rq(vblk->disk->queue, vblk->disk, req, false);
+ blk_put_request(req);
+
+ return err;
+}
+
+static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long data)
+{
+ struct gendisk *disk = bdev->bd_disk;
+ struct virtio_blk *vblk = disk->private_data;
+
+ /*
+ * Only allow the generic SCSI ioctls if the host can support it.
+ */
+ if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
+ return -ENOTTY;
+
+ return scsi_cmd_blk_ioctl(bdev, mode, cmd,
+ (void __user *)data);
+}
+
+/* We provide getgeo only to please some old bootloader/partitioning tools */
+static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
+{
+ struct virtio_blk *vblk = bd->bd_disk->private_data;
+ struct virtio_blk_geometry vgeo;
+ int err;
+
+ /* see if the host passed in geometry config */
+ err = virtio_config_val(vblk->vdev, VIRTIO_BLK_F_GEOMETRY,
+ offsetof(struct virtio_blk_config, geometry),
+ &vgeo);
+
+ if (!err) {
+ geo->heads = vgeo.heads;
+ geo->sectors = vgeo.sectors;
+ geo->cylinders = vgeo.cylinders;
+ } else {
+ /* some standard values, similar to sd */
+ geo->heads = 1 << 6;
+ geo->sectors = 1 << 5;
+ geo->cylinders = get_capacity(bd->bd_disk) >> 11;
+ }
+ return 0;
+}
+
+static const struct block_device_operations virtblk_fops = {
+ .ioctl = virtblk_ioctl,
+ .owner = THIS_MODULE,
+ .getgeo = virtblk_getgeo,
+};
+
+static int index_to_minor(int index)
+{
+ return index << PART_BITS;
+}
+
+static int minor_to_index(int minor)
+{
+ return minor >> PART_BITS;
+}
+
+static ssize_t virtblk_serial_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gendisk *disk = dev_to_disk(dev);
+ int err;
+
+ /* sysfs gives us a PAGE_SIZE buffer */
+ BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES);
+
+ buf[VIRTIO_BLK_ID_BYTES] = '\0';
+ err = virtblk_get_id(disk, buf);
+ if (!err)
+ return strlen(buf);
+
+ if (err == -EIO) /* Unsupported? Make it empty. */
+ return 0;
+
+ return err;
+}
+DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL);
+
+static void virtblk_config_changed_work(struct work_struct *work)
+{
+ struct virtio_blk *vblk =
+ container_of(work, struct virtio_blk, config_work);
+ struct virtio_device *vdev = vblk->vdev;
+ struct request_queue *q = vblk->disk->queue;
+ char cap_str_2[10], cap_str_10[10];
+ u64 capacity, size;
+
+ mutex_lock(&vblk->config_lock);
+ if (!vblk->config_enable)
+ goto done;
+
+ /* Host must always specify the capacity. */
+ vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity),
+ &capacity, sizeof(capacity));
+
+ /* If capacity is too big, truncate with warning. */
+ if ((sector_t)capacity != capacity) {
+ dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
+ (unsigned long long)capacity);
+ capacity = (sector_t)-1;
+ }
+
+ size = capacity * queue_logical_block_size(q);
+ string_get_size(size, STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
+ string_get_size(size, STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
+
+ dev_notice(&vdev->dev,
+ "new size: %llu %d-byte logical blocks (%s/%s)\n",
+ (unsigned long long)capacity,
+ queue_logical_block_size(q),
+ cap_str_10, cap_str_2);
+
+ set_capacity(vblk->disk, capacity);
+ revalidate_disk(vblk->disk);
+done:
+ mutex_unlock(&vblk->config_lock);
+}
+
+static void virtblk_config_changed(struct virtio_device *vdev)
+{
+ struct virtio_blk *vblk = vdev->priv;
+
+ queue_work(virtblk_wq, &vblk->config_work);
+}
+
+static int init_vq(struct virtio_blk *vblk)
+{
+ int err = 0;
+
+ /* We expect one virtqueue, for output. */
+ vblk->vq = virtio_find_single_vq(vblk->vdev, blk_done, "requests");
+ if (IS_ERR(vblk->vq))
+ err = PTR_ERR(vblk->vq);
+
+ return err;
+}
+
+/*
+ * Legacy naming scheme used for virtio devices. We are stuck with it for
+ * virtio blk but don't ever use it for any new driver.
+ */
+static int virtblk_name_format(char *prefix, int index, char *buf, int buflen)
+{
+ const int base = 'z' - 'a' + 1;
+ char *begin = buf + strlen(prefix);
+ char *end = buf + buflen;
+ char *p;
+ int unit;
+
+ p = end - 1;
+ *p = '\0';
+ unit = base;
+ do {
+ if (p == begin)
+ return -EINVAL;
+ *--p = 'a' + (index % unit);
+ index = (index / unit) - 1;
+ } while (index >= 0);
+
+ memmove(begin, p, end - p);
+ memcpy(buf, prefix, strlen(prefix));
+
+ return 0;
+}
+
+static int __devinit virtblk_probe(struct virtio_device *vdev)
+{
+ struct virtio_blk *vblk;
+ struct request_queue *q;
+ int err, index;
+ u64 cap;
+ u32 v, blk_size, sg_elems, opt_io_size;
+ u16 min_io_size;
+ u8 physical_block_exp, alignment_offset;
+
+ err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
+ GFP_KERNEL);
+ if (err < 0)
+ goto out;
+ index = err;
+
+ /* We need to know how many segments before we allocate. */
+ err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX,
+ offsetof(struct virtio_blk_config, seg_max),
+ &sg_elems);
+
+ /* We need at least one SG element, whatever they say. */
+ if (err || !sg_elems)
+ sg_elems = 1;
+
+ /* We need an extra sg elements at head and tail. */
+ sg_elems += 2;
+ vdev->priv = vblk = kmalloc(sizeof(*vblk) +
+ sizeof(vblk->sg[0]) * sg_elems, GFP_KERNEL);
+ if (!vblk) {
+ err = -ENOMEM;
+ goto out_free_index;
+ }
+
+ vblk->vdev = vdev;
+ vblk->sg_elems = sg_elems;
+ sg_init_table(vblk->sg, vblk->sg_elems);
+ mutex_init(&vblk->config_lock);
+ INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
+ vblk->config_enable = true;
+
+ err = init_vq(vblk);
+ if (err)
+ goto out_free_vblk;
+
+ vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req));
+ if (!vblk->pool) {
+ err = -ENOMEM;
+ goto out_free_vq;
+ }
+
+ /* FIXME: How many partitions? How long is a piece of string? */
+ vblk->disk = alloc_disk(1 << PART_BITS);
+ if (!vblk->disk) {
+ err = -ENOMEM;
+ goto out_mempool;
+ }
+
+ q = vblk->disk->queue = blk_init_queue(do_virtblk_request, NULL);
+ if (!q) {
+ err = -ENOMEM;
+ goto out_put_disk;
+ }
+
+ q->queuedata = vblk;
+
+ virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
+
+ vblk->disk->major = major;
+ vblk->disk->first_minor = index_to_minor(index);
+ vblk->disk->private_data = vblk;
+ vblk->disk->fops = &virtblk_fops;
+ vblk->disk->driverfs_dev = &vdev->dev;
+ vblk->index = index;
+
+ /* configure queue flush support */
+ if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH))
+ blk_queue_flush(q, REQ_FLUSH);
+
+ /* If disk is read-only in the host, the guest should obey */
+ if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
+ set_disk_ro(vblk->disk, 1);
+
+ /* Host must always specify the capacity. */
+ vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity),
+ &cap, sizeof(cap));
+
+ /* If capacity is too big, truncate with warning. */
+ if ((sector_t)cap != cap) {
+ dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
+ (unsigned long long)cap);
+ cap = (sector_t)-1;
+ }
+ set_capacity(vblk->disk, cap);
+
+ /* We can handle whatever the host told us to handle. */
+ blk_queue_max_segments(q, vblk->sg_elems-2);
+
+ /* No need to bounce any requests */
+ blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
+
+ /* No real sector limit. */
+ blk_queue_max_hw_sectors(q, -1U);
+
+ /* Host can optionally specify maximum segment size and number of
+ * segments. */
+ err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX,
+ offsetof(struct virtio_blk_config, size_max),
+ &v);
+ if (!err)
+ blk_queue_max_segment_size(q, v);
+ else
+ blk_queue_max_segment_size(q, -1U);
+
+ /* Host can optionally specify the block size of the device */
+ err = virtio_config_val(vdev, VIRTIO_BLK_F_BLK_SIZE,
+ offsetof(struct virtio_blk_config, blk_size),
+ &blk_size);
+ if (!err)
+ blk_queue_logical_block_size(q, blk_size);
+ else
+ blk_size = queue_logical_block_size(q);
+
+ /* Use topology information if available */
+ err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY,
+ offsetof(struct virtio_blk_config, physical_block_exp),
+ &physical_block_exp);
+ if (!err && physical_block_exp)
+ blk_queue_physical_block_size(q,
+ blk_size * (1 << physical_block_exp));
+
+ err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY,
+ offsetof(struct virtio_blk_config, alignment_offset),
+ &alignment_offset);
+ if (!err && alignment_offset)
+ blk_queue_alignment_offset(q, blk_size * alignment_offset);
+
+ err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY,
+ offsetof(struct virtio_blk_config, min_io_size),
+ &min_io_size);
+ if (!err && min_io_size)
+ blk_queue_io_min(q, blk_size * min_io_size);
+
+ err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY,
+ offsetof(struct virtio_blk_config, opt_io_size),
+ &opt_io_size);
+ if (!err && opt_io_size)
+ blk_queue_io_opt(q, blk_size * opt_io_size);
+
+
+ add_disk(vblk->disk);
+ err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial);
+ if (err)
+ goto out_del_disk;
+
+ return 0;
+
+out_del_disk:
+ del_gendisk(vblk->disk);
+ blk_cleanup_queue(vblk->disk->queue);
+out_put_disk:
+ put_disk(vblk->disk);
+out_mempool:
+ mempool_destroy(vblk->pool);
+out_free_vq:
+ vdev->config->del_vqs(vdev);
+out_free_vblk:
+ kfree(vblk);
+out_free_index:
+ ida_simple_remove(&vd_index_ida, index);
+out:
+ return err;
+}
+
+static void __devexit virtblk_remove(struct virtio_device *vdev)
+{
+ struct virtio_blk *vblk = vdev->priv;
+ int index = vblk->index;
+ int refc;
+
+ /* Prevent config work handler from accessing the device. */
+ mutex_lock(&vblk->config_lock);
+ vblk->config_enable = false;
+ mutex_unlock(&vblk->config_lock);
+
+ del_gendisk(vblk->disk);
+ blk_cleanup_queue(vblk->disk->queue);
+
+ /* Stop all the virtqueues. */
+ vdev->config->reset(vdev);
+
+ flush_work(&vblk->config_work);
+
+ refc = atomic_read(&disk_to_dev(vblk->disk)->kobj.kref.refcount);
+ put_disk(vblk->disk);
+ mempool_destroy(vblk->pool);
+ vdev->config->del_vqs(vdev);
+ kfree(vblk);
+
+ /* Only free device id if we don't have any users */
+ if (refc == 1)
+ ida_simple_remove(&vd_index_ida, index);
+}
+
+#ifdef CONFIG_PM
+static int virtblk_freeze(struct virtio_device *vdev)
+{
+ struct virtio_blk *vblk = vdev->priv;
+
+ /* Ensure we don't receive any more interrupts */
+ vdev->config->reset(vdev);
+
+ /* Prevent config work handler from accessing the device. */
+ mutex_lock(&vblk->config_lock);
+ vblk->config_enable = false;
+ mutex_unlock(&vblk->config_lock);
+
+ flush_work(&vblk->config_work);
+
+ spin_lock_irq(vblk->disk->queue->queue_lock);
+ blk_stop_queue(vblk->disk->queue);
+ spin_unlock_irq(vblk->disk->queue->queue_lock);
+ blk_sync_queue(vblk->disk->queue);
+
+ vdev->config->del_vqs(vdev);
+ return 0;
+}
+
+static int virtblk_restore(struct virtio_device *vdev)
+{
+ struct virtio_blk *vblk = vdev->priv;
+ int ret;
+
+ vblk->config_enable = true;
+ ret = init_vq(vdev->priv);
+ if (!ret) {
+ spin_lock_irq(vblk->disk->queue->queue_lock);
+ blk_start_queue(vblk->disk->queue);
+ spin_unlock_irq(vblk->disk->queue->queue_lock);
+ }
+ return ret;
+}
+#endif
+
+static const struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static unsigned int features[] = {
+ VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
+ VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI,
+ VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY
+};
+
+/*
+ * virtio_blk causes spurious section mismatch warning by
+ * simultaneously referring to a __devinit and a __devexit function.
+ * Use __refdata to avoid this warning.
+ */
+static struct virtio_driver __refdata virtio_blk = {
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = virtblk_probe,
+ .remove = __devexit_p(virtblk_remove),
+ .config_changed = virtblk_config_changed,
+#ifdef CONFIG_PM
+ .freeze = virtblk_freeze,
+ .restore = virtblk_restore,
+#endif
+};
+
+static int __init init(void)
+{
+ int error;
+
+ virtblk_wq = alloc_workqueue("virtio-blk", 0, 0);
+ if (!virtblk_wq)
+ return -ENOMEM;
+
+ major = register_blkdev(0, "virtblk");
+ if (major < 0) {
+ error = major;
+ goto out_destroy_workqueue;
+ }
+
+ error = register_virtio_driver(&virtio_blk);
+ if (error)
+ goto out_unregister_blkdev;
+ return 0;
+
+out_unregister_blkdev:
+ unregister_blkdev(major, "virtblk");
+out_destroy_workqueue:
+ destroy_workqueue(virtblk_wq);
+ return error;
+}
+
+static void __exit fini(void)
+{
+ unregister_blkdev(major, "virtblk");
+ unregister_virtio_driver(&virtio_blk);
+ destroy_workqueue(virtblk_wq);
+}
+module_init(init);
+module_exit(fini);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio block driver");
+MODULE_LICENSE("GPL");