virtio: document functions better.

The old documentation is left over from when we used a structure with
strategy pointers.

And move the documentation to the C file as per kernel practice.
Though I disagree...

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 0 insertions, 47 deletions

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 4c069d8bd740..73ad7243128f 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -25,53 +25,6 @@ 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_gfp(struct virtqueue *vq,
 			  struct scatterlist sg[],
 			  unsigned int out_num,