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