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 	const struct virtio_config_ops *config;
18 };
19 
20 struct virtqueue {
21 	struct list_head list;
22 	void (*callback)(struct virtqueue *vq);
23 	const char *name;
24 	struct virtio_device *vdev;
25         unsigned int index;
26         unsigned int num_free;
27 	unsigned int num_max;
28 	void *priv;
29 	bool reset;
30 };
31 
32 /* Interfaces exported by virtio_ring. */
33 int virtqueue_add_sgs(struct virtqueue *vq,
34 		      struct scatterlist *sgs[],
35 		      unsigned int out_sgs,
36 		      unsigned int in_sgs,
37 		      void *data,
38 		      gfp_t gfp);
39 
40 int virtqueue_add_outbuf(struct virtqueue *vq,
41 			 struct scatterlist sg[], unsigned int num,
42 			 void *data,
43 			 gfp_t gfp);
44 
45 int virtqueue_add_inbuf(struct virtqueue *vq,
46 			struct scatterlist sg[], unsigned int num,
47 			void *data,
48 			gfp_t gfp);
49 
50 bool virtqueue_kick(struct virtqueue *vq);
51 
52 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
53 
54 void virtqueue_disable_cb(struct virtqueue *vq);
55 
56 bool virtqueue_enable_cb(struct virtqueue *vq);
57 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
58 
59 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
60 struct virtqueue *vring_new_virtqueue(unsigned int index,
61 				      unsigned int num,
62 				      unsigned int vring_align,
63 				      struct virtio_device *vdev,
64 				      bool weak_barriers,
65 				      bool ctx,
66 				      void *pages,
67 				      bool (*notify)(struct virtqueue *vq),
68 				      void (*callback)(struct virtqueue *vq),
69 				      const char *name);
70 void vring_del_virtqueue(struct virtqueue *vq);
71 
72 #endif
73