Linux Kernel  3.7.1
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virtio.h
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1 #ifndef _LINUX_VIRTIO_H
2 #define _LINUX_VIRTIO_H
3 /* Everything a virtio driver needs to work with any particular virtio
4  * implementation. */
5 #include <linux/types.h>
6 #include <linux/scatterlist.h>
7 #include <linux/spinlock.h>
8 #include <linux/device.h>
10 #include <linux/gfp.h>
11 
20 struct virtqueue {
21  struct list_head list;
22  void (*callback)(struct virtqueue *vq);
23  const char *name;
25  void *priv;
26 };
27 
28 int virtqueue_add_buf(struct virtqueue *vq,
29  struct scatterlist sg[],
30  unsigned int out_num,
31  unsigned int in_num,
32  void *data,
33  gfp_t gfp);
34 
35 void virtqueue_kick(struct virtqueue *vq);
36 
37 bool virtqueue_kick_prepare(struct virtqueue *vq);
38 
39 void virtqueue_notify(struct virtqueue *vq);
40 
41 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
42 
43 void virtqueue_disable_cb(struct virtqueue *vq);
44 
45 bool virtqueue_enable_cb(struct virtqueue *vq);
46 
47 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
48 
49 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
50 
51 unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
52 
53 int virtqueue_get_queue_index(struct virtqueue *vq);
54 
65 struct virtio_device {
66  int index;
67  struct device dev;
70  struct list_head vqs;
71  /* Note that this is a Linux set_bit-style bitmap. */
72  unsigned long features[1];
73  void *priv;
74 };
75 
76 #define dev_to_virtio(dev) container_of(dev, struct virtio_device, dev)
79 
91 struct virtio_driver {
93  const struct virtio_device_id *id_table;
94  const unsigned int *feature_table;
95  unsigned int feature_table_size;
96  int (*probe)(struct virtio_device *dev);
97  void (*scan)(struct virtio_device *dev);
98  void (*remove)(struct virtio_device *dev);
100 #ifdef CONFIG_PM
101  int (*freeze)(struct virtio_device *dev);
102  int (*restore)(struct virtio_device *dev);
103 #endif
104 };
105 
106 int register_virtio_driver(struct virtio_driver *drv);
107 void unregister_virtio_driver(struct virtio_driver *drv);
108 #endif /* _LINUX_VIRTIO_H */