1#ifndef _LINUX_VIRTIO_H
2#define _LINUX_VIRTIO_H
3
4
5#include <linux/types.h>
6#include <linux/scatterlist.h>
7#include <linux/spinlock.h>
8#include <linux/device.h>
9#include <linux/mod_devicetable.h>
10#include <linux/gfp.h>
11#include <linux/vringh.h>
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27struct virtqueue {
28 struct list_head list;
29 void (*callback)(struct virtqueue *vq);
30 const char *name;
31 struct virtio_device *vdev;
32 unsigned int index;
33 unsigned int num_free;
34 void *priv;
35};
36
37int virtqueue_add_outbuf(struct virtqueue *vq,
38 struct scatterlist sg[], unsigned int num,
39 void *data,
40 gfp_t gfp);
41
42int virtqueue_add_inbuf(struct virtqueue *vq,
43 struct scatterlist sg[], unsigned int num,
44 void *data,
45 gfp_t gfp);
46
47int __virtqueue_add_sgs(struct virtqueue *vq,
48 struct scatterlist *sgs[],
49 unsigned int out_sgs,
50 unsigned int in_sgs,
51 void *data,
52 gfp_t gfp,
53 bool dma);
54
55int virtqueue_add_sgs(struct virtqueue *vq,
56 struct scatterlist *sgs[],
57 unsigned int out_sgs,
58 unsigned int in_sgs,
59 void *data,
60 gfp_t gfp);
61
62bool virtqueue_kick(struct virtqueue *vq);
63
64bool virtqueue_kick_prepare(struct virtqueue *vq);
65
66bool virtqueue_notify(struct virtqueue *vq);
67
68void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
69
70void virtqueue_disable_cb(struct virtqueue *vq);
71
72bool virtqueue_enable_cb(struct virtqueue *vq);
73
74unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq);
75
76bool virtqueue_poll(struct virtqueue *vq, unsigned);
77
78bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
79
80void *virtqueue_detach_unused_buf(struct virtqueue *vq);
81
82unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
83
84bool virtqueue_is_broken(struct virtqueue *vq);
85
86const struct vring *virtqueue_get_vring(struct virtqueue *vq);
87dma_addr_t virtqueue_get_desc_addr(struct virtqueue *vq);
88dma_addr_t virtqueue_get_avail_addr(struct virtqueue *vq);
89dma_addr_t virtqueue_get_used_addr(struct virtqueue *vq);
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95static inline void *virtqueue_get_desc(struct virtqueue *vq)
96{
97 return virtqueue_get_vring(vq)->desc;
98}
99static inline void *virtqueue_get_avail(struct virtqueue *vq)
100{
101 return virtqueue_get_vring(vq)->avail;
102}
103static inline void *virtqueue_get_used(struct virtqueue *vq)
104{
105 return virtqueue_get_vring(vq)->used;
106}
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123struct virtio_device {
124 int index;
125 bool failed;
126 bool config_enabled;
127 bool config_change_pending;
128 spinlock_t config_lock;
129 struct device dev;
130 struct virtio_device_id id;
131 const struct virtio_config_ops *config;
132 const struct vringh_config_ops *vringh_config;
133 struct list_head vqs;
134 u64 features;
135 void *priv;
136};
137
138static inline struct virtio_device *dev_to_virtio(struct device *_dev)
139{
140 return container_of(_dev, struct virtio_device, dev);
141}
142
143int register_virtio_device(struct virtio_device *dev);
144void unregister_virtio_device(struct virtio_device *dev);
145
146void virtio_break_device(struct virtio_device *dev);
147
148void virtio_config_changed(struct virtio_device *dev);
149#ifdef CONFIG_PM_SLEEP
150int virtio_device_freeze(struct virtio_device *dev);
151int virtio_device_restore(struct virtio_device *dev);
152#endif
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167struct virtio_driver {
168 struct device_driver driver;
169 const struct virtio_device_id *id_table;
170 const unsigned int *feature_table;
171 unsigned int feature_table_size;
172 const unsigned int *feature_table_legacy;
173 unsigned int feature_table_size_legacy;
174 int (*probe)(struct virtio_device *dev);
175 void (*scan)(struct virtio_device *dev);
176 void (*remove)(struct virtio_device *dev);
177 void (*config_changed)(struct virtio_device *dev);
178#ifdef CONFIG_PM
179 int (*freeze)(struct virtio_device *dev);
180 int (*restore)(struct virtio_device *dev);
181#endif
182};
183
184static inline struct virtio_driver *drv_to_virtio(struct device_driver *drv)
185{
186 return container_of(drv, struct virtio_driver, driver);
187}
188
189int register_virtio_driver(struct virtio_driver *drv);
190void unregister_virtio_driver(struct virtio_driver *drv);
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197#define module_virtio_driver(__virtio_driver) \
198 module_driver(__virtio_driver, register_virtio_driver, \
199 unregister_virtio_driver)
200#endif
201