From 3251063155032729b8793ac3957136ae25c0bafa Mon Sep 17 00:00:00 2001 From: Xuan Zhuo Date: Mon, 1 Aug 2022 14:38:46 +0800 Subject: virtio: allow to unbreak/break virtqueue individually This patch allows the new introduced __virtqueue_break()/__virtqueue_unbreak() to break/unbreak the virtqueue. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang Message-Id: <20220801063902.129329-27-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin --- drivers/virtio/virtio_ring.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'drivers/virtio') diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 6447a09e2e38..accb3ae6cc95 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -2724,6 +2724,30 @@ unsigned int virtqueue_get_vring_size(struct virtqueue *_vq) } EXPORT_SYMBOL_GPL(virtqueue_get_vring_size); +/* + * This function should only be called by the core, not directly by the driver. + */ +void __virtqueue_break(struct virtqueue *_vq) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + /* Pairs with READ_ONCE() in virtqueue_is_broken(). */ + WRITE_ONCE(vq->broken, true); +} +EXPORT_SYMBOL_GPL(__virtqueue_break); + +/* + * This function should only be called by the core, not directly by the driver. + */ +void __virtqueue_unbreak(struct virtqueue *_vq) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + /* Pairs with READ_ONCE() in virtqueue_is_broken(). */ + WRITE_ONCE(vq->broken, false); +} +EXPORT_SYMBOL_GPL(__virtqueue_unbreak); + bool virtqueue_is_broken(struct virtqueue *_vq) { struct vring_virtqueue *vq = to_vvq(_vq); -- cgit v1.2.3