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| author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2014-10-07 18:39:47 +0400 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-12-09 13:05:25 +0300 |
| commit | 890626521503318d7ac92a4a3b9feba55c0131ec (patch) | |
| tree | 643da66cb95f5afbfc752901654626c373e26820 | |
| parent | 92e6d7438ee631aac85258ee3d4de8c860d8c32f (diff) | |
| download | linux-890626521503318d7ac92a4a3b9feba55c0131ec.tar.xz | |
virtio: allow transports to get avail/used addresses
For virtio-1, we can theoretically have a more complex virtqueue
layout with avail and used buffers not on a contiguous memory area
with the descriptor table. For now, it's fine for a transport driver
to stay with the old layout: It needs, however, a way to access
the locations of the avail/used rings so it can register them with
the host.
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 16 | ||||
| -rw-r--r-- | include/linux/virtio.h | 3 |
2 files changed, 19 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 0d3c73737652..55532a43ead3 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -827,4 +827,20 @@ void virtio_break_device(struct virtio_device *dev) } EXPORT_SYMBOL_GPL(virtio_break_device); +void *virtqueue_get_avail(struct virtqueue *_vq) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + return vq->vring.avail; +} +EXPORT_SYMBOL_GPL(virtqueue_get_avail); + +void *virtqueue_get_used(struct virtqueue *_vq) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + return vq->vring.used; +} +EXPORT_SYMBOL_GPL(virtqueue_get_used); + MODULE_LICENSE("GPL"); diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 149284e5196d..d6359a5d5d4e 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -75,6 +75,9 @@ unsigned int virtqueue_get_vring_size(struct virtqueue *vq); bool virtqueue_is_broken(struct virtqueue *vq); +void *virtqueue_get_avail(struct virtqueue *vq); +void *virtqueue_get_used(struct virtqueue *vq); + /** * virtio_device - representation of a device using virtio * @index: unique position on the virtio bus |