GNU Linux-libre 6.9.1-gnu
[releases.git] / tools / virtio / linux / virtio.h
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