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
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