Commit 32510631 authored by Xuan Zhuo's avatar Xuan Zhuo Committed by Michael S. Tsirkin
Browse files

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: default avatarXuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-27-xuanzhuo@linux.alibaba.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent ea024594

drivers/virtio/virtio_ring.c

+24 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/virtio.h

+3 −0
Original line number Diff line number Diff line
@@ -138,6 +138,9 @@ bool is_virtio_device(struct device *dev); 
void virtio_break_device(struct virtio_device *dev);

void __virtio_unbreak_device(struct virtio_device *dev);



void __virtqueue_break(struct virtqueue *_vq);

void __virtqueue_unbreak(struct virtqueue *_vq);



void virtio_config_changed(struct virtio_device *dev);

#ifdef CONFIG_PM_SLEEP

int virtio_device_freeze(struct virtio_device *dev);