diff options
| author | Xuan Zhuo <xuanzhuo@linux.alibaba.com> | 2023-08-10 14:30:54 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-09-04 00:10:23 +0200 |
| commit | ba3e0c47c070c4cf010be9fb1e4eb669c744af11 (patch) | |
| tree | 327b335e496638ffe2c06c77082679752af18548 /drivers/virtio | |
| parent | virtio_ring: separate the logic of reset/enable from virtqueue_resize (diff) | |
| download | linux-ba3e0c47c070c4cf010be9fb1e4eb669c744af11.tar.xz linux-ba3e0c47c070c4cf010be9fb1e4eb669c744af11.zip | |
virtio_ring: introduce virtqueue_reset()
Introduce virtqueue_reset() to release all buffer inside vq.
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230810123057.43407-10-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 | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 23172d98e48e..639c20b19e06 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -2812,6 +2812,39 @@ int virtqueue_set_dma_premapped(struct virtqueue *_vq) } EXPORT_SYMBOL_GPL(virtqueue_set_dma_premapped); +/** + * virtqueue_reset - detach and recycle all unused buffers + * @_vq: the struct virtqueue we're talking about. + * @recycle: callback to recycle unused buffers + * + * Caller must ensure we don't call this with other virtqueue operations + * at the same time (except where noted). + * + * Returns zero or a negative error. + * 0: success. + * -EBUSY: Failed to sync with device, vq may not work properly + * -ENOENT: Transport or device not supported + * -EPERM: Operation not permitted + */ +int virtqueue_reset(struct virtqueue *_vq, + void (*recycle)(struct virtqueue *vq, void *buf)) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + int err; + + err = virtqueue_disable_and_recycle(_vq, recycle); + if (err) + return err; + + if (vq->packed_ring) + virtqueue_reinit_packed(vq); + else + virtqueue_reinit_split(vq); + + return virtqueue_enable_after_reset(_vq); +} +EXPORT_SYMBOL_GPL(virtqueue_reset); + /* Only available for split ring */ struct virtqueue *vring_new_virtqueue(unsigned int index, unsigned int num, |