virtio: add names to virtqueue struct, mapping from devices to queues.

Add a linked list of all virtqueues for a virtio device: this helps for
debugging and is also needed for upcoming interface change.

Also, add a "name" field for clearer debug messages.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index bf8ec283b23..9fae274751e 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -55,7 +55,8 @@
  * @find_vq: find a virtqueue and instantiate it.
  *      vdev: the virtio_device
  *      index: the 0-based virtqueue number in case there's more than one.
- *      callback: the virqtueue callback
+ *      callback: the virtqueue callback
+ *      name: the virtqueue name (mainly for debugging)
  *      Returns the new virtqueue or ERR_PTR() (eg. -ENOENT).
  * @del_vq: free a virtqueue found by find_vq().
  * @get_features: get the array of feature bits for this device.
@@ -77,7 +78,8 @@ struct virtio_config_ops
         void (*reset)(struct virtio_device *vdev);
         struct virtqueue *(*find_vq)(struct virtio_device *vdev,
                                      unsigned index,
-                                     void (*callback)(struct virtqueue *));
+                                     void (*callback)(struct virtqueue *),
+                                     const char *name);
         void (*del_vq)(struct virtqueue *vq);
         u32 (*get_features)(struct virtio_device *vdev);
         void (*finalize_features)(struct virtio_device *vdev);