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authorXuan Zhuo <xuanzhuo@linux.alibaba.com>2022-08-01 14:38:34 +0800
committerMichael S. Tsirkin <mst@redhat.com>2022-08-11 04:06:39 -0400
commite5175b419a1394e77ff418dd9bfaf15555dfe594 (patch)
tree8ccc914414c912e40195fc29e3a629e594f816a4 /drivers/virtio/virtio_ring.c
parente1d6a423ea1867a3a84f12a99981f036acb8f354 (diff)
downloadlinux-e5175b419a1394e77ff418dd9bfaf15555dfe594.tar.bz2
virtio_ring: split: introduce virtqueue_reinit_split()
Introduce a function to initialize vq without allocating new ring, desc_state, desc_extra. Subsequent patches will call this function after reset vq to reinitialize vq. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Acked-by: Jason Wang <jasowang@redhat.com> Message-Id: <20220801063902.129329-15-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio/virtio_ring.c')
-rw-r--r--drivers/virtio/virtio_ring.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index d0df887c3ada..948f8da7b780 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -957,6 +957,29 @@ static void virtqueue_vring_init_split(struct vring_virtqueue_split *vring_split
}
}
+static void virtqueue_reinit_split(struct vring_virtqueue *vq)
+{
+ int num;
+
+ num = vq->split.vring.num;
+
+ vq->split.vring.avail->flags = 0;
+ vq->split.vring.avail->idx = 0;
+
+ /* reset avail event */
+ vq->split.vring.avail->ring[num] = 0;
+
+ vq->split.vring.used->flags = 0;
+ vq->split.vring.used->idx = 0;
+
+ /* reset used event */
+ *(__virtio16 *)&(vq->split.vring.used->ring[num]) = 0;
+
+ virtqueue_init(vq, num);
+
+ virtqueue_vring_init_split(&vq->split, vq);
+}
+
static void virtqueue_vring_attach_split(struct vring_virtqueue *vq,
struct vring_virtqueue_split *vring_split)
{