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| author | Xuan Zhuo <xuanzhuo@linux.alibaba.com> | 2022-08-01 08:38:34 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-08-11 10:06:39 +0200 |
| commit | e5175b419a1394e77ff418dd9bfaf15555dfe594 (patch) | |
| tree | 8ccc914414c912e40195fc29e3a629e594f816a4 /drivers/virtio | |
| parent | virtio_ring: split: extract the logic of attach vring (diff) | |
| download | linux-e5175b419a1394e77ff418dd9bfaf15555dfe594.tar.xz linux-e5175b419a1394e77ff418dd9bfaf15555dfe594.zip | |
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')
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 23 |
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) { |