From e5175b419a1394e77ff418dd9bfaf15555dfe594 Mon Sep 17 00:00:00 2001 From: Xuan Zhuo Date: Mon, 1 Aug 2022 14:38:34 +0800 Subject: 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 Acked-by: Jason Wang Message-Id: <20220801063902.129329-15-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin --- drivers/virtio/virtio_ring.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'drivers/virtio') 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) { -- cgit v1.2.3