1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef LINUX_VIRTIO_H
3 #define LINUX_VIRTIO_H
4 #include <linux/scatterlist.h>
5 #include <linux/kernel.h>
6 
7 struct device {
8 	void *parent;
9 };
10 
11 struct virtio_device {
12 	struct device dev;
13 	u64 features;
14 	struct list_head vqs;
15 };
16 
17 struct virtqueue {
18 	struct list_head list;
19 	void (*callback)(struct virtqueue *vq);
20 	const char *name;
21 	struct virtio_device *vdev;
22         unsigned int index;
23         unsigned int num_free;
24 	void *priv;
25 };
26 
27 /* Interfaces exported by virtio_ring. */
28 int virtqueue_add_sgs(struct virtqueue *vq,
29 		      struct scatterlist *sgs[],
30 		      unsigned int out_sgs,
31 		      unsigned int in_sgs,
32 		      void *data,
33 		      gfp_t gfp);
34 
35 int virtqueue_add_outbuf(struct virtqueue *vq,
36 			 struct scatterlist sg[], unsigned int num,
37 			 void *data,
38 			 gfp_t gfp);
39 
40 int virtqueue_add_inbuf(struct virtqueue *vq,
41 			struct scatterlist sg[], unsigned int num,
42 			void *data,
43 			gfp_t gfp);
44 
45 bool virtqueue_kick(struct virtqueue *vq);
46 
47 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
48 
49 void virtqueue_disable_cb(struct virtqueue *vq);
50 
51 bool virtqueue_enable_cb(struct virtqueue *vq);
52 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
53 
54 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
55 struct virtqueue *vring_new_virtqueue(unsigned int index,
56 				      unsigned int num,
57 				      unsigned int vring_align,
58 				      struct virtio_device *vdev,
59 				      bool weak_barriers,
60 				      bool ctx,
61 				      void *pages,
62 				      bool (*notify)(struct virtqueue *vq),
63 				      void (*callback)(struct virtqueue *vq),
64 				      const char *name);
65 void vring_del_virtqueue(struct virtqueue *vq);
66 
67 #endif
68