Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

[firefly-linux-kernel-4.4.55.git] / include / linux / virtio.h

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 4c069d8bd74038568acc37992c4eb111188f261b..d0018d27c281ffa3a7135c1aa1a8deffc1b900ca 100644 (file)
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -25,70 +25,18 @@ struct virtqueue {
        void *priv;
 };
 
-/**
- * operations for virtqueue
- * virtqueue_add_buf: expose buffer to other end
- *     vq: the struct virtqueue we're talking about.
- *     sg: the description of the buffer(s).
- *     out_num: the number of sg readable by other side
- *     in_num: the number of sg which are writable (after readable ones)
- *     data: the token identifying the buffer.
- *     gfp: how to do memory allocations (if necessary).
- *      Returns remaining capacity of queue (sg segments) or a negative error.
- * virtqueue_kick: update after add_buf
- *     vq: the struct virtqueue
- *     After one or more add_buf calls, invoke this to kick the other side.
- * virtqueue_get_buf: get the next used buffer
- *     vq: the struct virtqueue we're talking about.
- *     len: the length written into the buffer
- *     Returns NULL or the "data" token handed to add_buf.
- * virtqueue_disable_cb: disable callbacks
- *     vq: the struct virtqueue we're talking about.
- *     Note that this is not necessarily synchronous, hence unreliable and only
- *     useful as an optimization.
- * virtqueue_enable_cb: restart callbacks after disable_cb.
- *     vq: the struct virtqueue we're talking about.
- *     This re-enables callbacks; it returns "false" if there are pending
- *     buffers in the queue, to detect a possible race between the driver
- *     checking for more work, and enabling callbacks.
- * virtqueue_enable_cb_delayed: restart callbacks after disable_cb.
- *     vq: the struct virtqueue we're talking about.
- *     This re-enables callbacks but hints to the other side to delay
- *     interrupts until most of the available buffers have been processed;
- *     it returns "false" if there are many pending buffers in the queue,
- *     to detect a possible race between the driver checking for more work,
- *     and enabling callbacks.
- * virtqueue_detach_unused_buf: detach first unused buffer
- *     vq: the struct virtqueue we're talking about.
- *     Returns NULL or the "data" token handed to add_buf
- * virtqueue_get_vring_size: return the size of the virtqueue's vring
- *     vq: the struct virtqueue containing the vring of interest.
- *     Returns the size of the vring.
- *
- * Locking rules are straightforward: the driver is responsible for
- * locking.  No two operations may be invoked simultaneously, with the exception
- * of virtqueue_disable_cb.
- *
- * All operations can be called in any context.
- */
+int virtqueue_add_buf(struct virtqueue *vq,
+                     struct scatterlist sg[],
+                     unsigned int out_num,
+                     unsigned int in_num,
+                     void *data,
+                     gfp_t gfp);
 
-int virtqueue_add_buf_gfp(struct virtqueue *vq,
-                         struct scatterlist sg[],
-                         unsigned int out_num,
-                         unsigned int in_num,
-                         void *data,
-                         gfp_t gfp);
+void virtqueue_kick(struct virtqueue *vq);
 
-static inline int virtqueue_add_buf(struct virtqueue *vq,
-                                   struct scatterlist sg[],
-                                   unsigned int out_num,
-                                   unsigned int in_num,
-                                   void *data)
-{
-       return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC);
-}
+bool virtqueue_kick_prepare(struct virtqueue *vq);
 
-void virtqueue_kick(struct virtqueue *vq);
+void virtqueue_notify(struct virtqueue *vq);
 
 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
 
@@ -146,6 +94,11 @@ struct virtio_driver {
        int (*probe)(struct virtio_device *dev);
        void (*remove)(struct virtio_device *dev);
        void (*config_changed)(struct virtio_device *dev);
+#ifdef CONFIG_PM
+       int (*freeze)(struct virtio_device *dev);
+       int (*thaw)(struct virtio_device *dev);
+       int (*restore)(struct virtio_device *dev);
+#endif
 };
 
 int register_virtio_driver(struct virtio_driver *drv);