1#ifndef LINUX_VIRTIO_H
2#define LINUX_VIRTIO_H
3#include <linux/scatterlist.h>
4#include <linux/kernel.h>
5
6/* TODO: empty stubs for now. Broken but enough for virtio_ring.c */
7#define list_add_tail(a, b) do {} while (0)
8#define list_del(a) do {} while (0)
9#define list_for_each_entry(a, b, c) while (0)
10/* end of stubs */
11
12struct virtio_device {
13	void *dev;
14	u64 features;
15};
16
17struct virtqueue {
18	/* TODO: commented as list macros are empty stubs for now.
19	 * Broken but enough for virtio_ring.c
20	 * struct list_head list; */
21	void (*callback)(struct virtqueue *vq);
22	const char *name;
23	struct virtio_device *vdev;
24        unsigned int index;
25        unsigned int num_free;
26	void *priv;
27};
28
29/* Interfaces exported by virtio_ring. */
30int virtqueue_add_sgs(struct virtqueue *vq,
31		      struct scatterlist *sgs[],
32		      unsigned int out_sgs,
33		      unsigned int in_sgs,
34		      void *data,
35		      gfp_t gfp);
36
37int virtqueue_add_outbuf(struct virtqueue *vq,
38			 struct scatterlist sg[], unsigned int num,
39			 void *data,
40			 gfp_t gfp);
41
42int virtqueue_add_inbuf(struct virtqueue *vq,
43			struct scatterlist sg[], unsigned int num,
44			void *data,
45			gfp_t gfp);
46
47bool virtqueue_kick(struct virtqueue *vq);
48
49void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
50
51void virtqueue_disable_cb(struct virtqueue *vq);
52
53bool virtqueue_enable_cb(struct virtqueue *vq);
54bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
55
56void *virtqueue_detach_unused_buf(struct virtqueue *vq);
57struct virtqueue *vring_new_virtqueue(unsigned int index,
58				      unsigned int num,
59				      unsigned int vring_align,
60				      struct virtio_device *vdev,
61				      bool weak_barriers,
62				      void *pages,
63				      bool (*notify)(struct virtqueue *vq),
64				      void (*callback)(struct virtqueue *vq),
65				      const char *name);
66void vring_del_virtqueue(struct virtqueue *vq);
67
68#endif
69