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 #include <linux/spinlock.h>
7 
8 struct device {
9 	void *parent;
10 };
11 
12 struct virtio_device {
13 	struct device dev;
14 	u64 features;
15 	struct list_head vqs;
16 	spinlock_t vqs_list_lock;
17 };
18 
19 struct virtqueue {
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. */
30 int 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 
37 int virtqueue_add_outbuf(struct virtqueue *vq,
38 			 struct scatterlist sg[], unsigned int num,
39 			 void *data,
40 			 gfp_t gfp);
41 
42 int virtqueue_add_inbuf(struct virtqueue *vq,
43 			struct scatterlist sg[], unsigned int num,
44 			void *data,
45 			gfp_t gfp);
46 
47 bool virtqueue_kick(struct virtqueue *vq);
48 
49 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
50 
51 void virtqueue_disable_cb(struct virtqueue *vq);
52 
53 bool virtqueue_enable_cb(struct virtqueue *vq);
54 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
55 
56 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
57 struct 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 				      bool ctx,
63 				      void *pages,
64 				      bool (*notify)(struct virtqueue *vq),
65 				      void (*callback)(struct virtqueue *vq),
66 				      const char *name);
67 void vring_del_virtqueue(struct virtqueue *vq);
68 
69 #endif
70