From: Cornelia Huck Date: Tue, 7 Oct 2014 14:39:47 +0000 (+0200) Subject: virtio: allow transports to get avail/used addresses X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=890626521503318d7ac92a4a3b9feba55c0131ec;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 Signed-off-by: Cornelia Huck Signed-off-by: Michael S. Tsirkin --- 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