@@ -230,6 +230,46 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
desc);
}
+/**
+ * virtio_reset_vq - reset a queue individually
+ * @vq: the virtqueue
+ *
+ * returns 0 on success or error status
+ *
+ * The api process of reset under normal circumstances:
+ * 1. virtio_reset_vq() - notify the device to reset the queue
+ * 2. virtqueue_detach_unused_buf() - recycle the buffer submitted
+ * 3. virtqueue_reset_vring() - reset the vring (may re-alloc)
+ * 4. virtio_enable_resetq() - mmap vring to device, and enable the queue
+ *
+ * Caller should guarantee that the vring is not accessed by any functions
+ * of virtqueue.
+ */
+static inline
+int virtio_reset_vq(struct virtqueue *vq)
+{
+ if (!vq->vdev->config->reset_vq)
+ return -ENOENT;
+
+ return vq->vdev->config->reset_vq(vq);
+}
+
+/**
+ * virtio_enable_resetq - enable a reset queue
+ * @vq: the virtqueue
+ *
+ * returns 0 on success or error status
+ *
+ */
+static inline
+int virtio_enable_resetq(struct virtqueue *vq)
+{
+ if (!vq->vdev->config->enable_reset_vq)
+ return -ENOENT;
+
+ return vq->vdev->config->enable_reset_vq(vq);
+}
+
/**
* virtio_device_ready - enable vq use in probe function
* @vdev: the device
Add helper for virtio queue reset. * virtio_reset_vq(): reset a queue individually * virtio_enable_resetq(): enable a reset queue Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- include/linux/virtio_config.h | 40 +++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+)