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virtio: allow to unbreak/break virtqueue individually

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This patch allows the new introduced
__virtqueue_break()/__virtqueue_unbreak() to break/unbreak the
virtqueue.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-27-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xuan Zhuo 2022-08-01 14:38:46 +08:00 committed by Michael S. Tsirkin
parent ea024594b1
commit 3251063155
2 changed files with 27 additions and 0 deletions
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24
drivers/virtio/virtio_ring.c
View File

@ -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);

3
include/linux/virtio.h
View File

@ -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);