1 files changed, 33 insertions, 22 deletions

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 40d1709bdbf4..aff5b4f74041 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -7,6 +7,7 @@
 #include <linux/spinlock.h>
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>
+#include <linux/gfp.h>
 
 /**
  * virtqueue - a queue to register buffers for sending or receiving.
@@ -14,7 +15,6 @@
  * @callback: the function to call when buffers are consumed (can be NULL).
  * @name: the name of this virtqueue (mainly for debugging)
  * @vdev: the virtio device this queue was created for.
- * @vq_ops: the operations for this virtqueue (see below).
  * @priv: a pointer for the virtqueue implementation to use.
  */
 struct virtqueue {
@@ -22,60 +22,71 @@ struct virtqueue {
         void (*callback)(struct virtqueue *vq);
         const char *name;
         struct virtio_device *vdev;
-        struct virtqueue_ops *vq_ops;
         void *priv;
 };
 
 /**
- * virtqueue_ops - operations for virtqueue abstraction layer
- * @add_buf: expose buffer to other end
+ * 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.
- * @kick: update after add_buf
+ * virtqueue_kick: update after add_buf
  *      vq: the struct virtqueue
  *      After one or more add_buf calls, invoke this to kick the other side.
- * @get_buf: get the next used buffer
+ * 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.
- * @disable_cb: disable callbacks
+ * 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.
- * @enable_cb: restart callbacks after disable_cb.
+ * 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.
- * @detach_unused_buf: detach first unused buffer
+ * 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
  *
  * Locking rules are straightforward: the driver is responsible for
  * locking.  No two operations may be invoked simultaneously, with the exception
- * of @disable_cb.
+ * of virtqueue_disable_cb.
  *
  * All operations can be called in any context.
  */
-struct virtqueue_ops {
-        int (*add_buf)(struct virtqueue *vq,
-                       struct scatterlist sg[],
-                       unsigned int out_num,
-                       unsigned int in_num,
-                       void *data);
 
-        void (*kick)(struct virtqueue *vq);
+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 *(*get_buf)(struct virtqueue *vq, unsigned int *len);
+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);
+}
 
-        void (*disable_cb)(struct virtqueue *vq);
-        bool (*enable_cb)(struct virtqueue *vq);
-        void *(*detach_unused_buf)(struct virtqueue *vq);
-};
+void virtqueue_kick(struct virtqueue *vq);
+
+void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
+
+void virtqueue_disable_cb(struct virtqueue *vq);
+
+bool virtqueue_enable_cb(struct virtqueue *vq);
+
+void *virtqueue_detach_unused_buf(struct virtqueue *vq);
 
 /**
  * virtio_device - representation of a device using virtio