1
2#ifndef _LINUX_VIRTIO_RING_H
3#define _LINUX_VIRTIO_RING_H
4
5#include <asm/barrier.h>
6#include <linux/irqreturn.h>
7#include <uapi/linux/virtio_ring.h>
8
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24
25static inline void virtio_mb(bool weak_barriers)
26{
27 if (weak_barriers)
28 virt_mb();
29 else
30 mb();
31}
32
33static inline void virtio_rmb(bool weak_barriers)
34{
35 if (weak_barriers)
36 virt_rmb();
37 else
38 dma_rmb();
39}
40
41static inline void virtio_wmb(bool weak_barriers)
42{
43 if (weak_barriers)
44 virt_wmb();
45 else
46 dma_wmb();
47}
48
49static inline void virtio_store_mb(bool weak_barriers,
50 __virtio16 *p, __virtio16 v)
51{
52 if (weak_barriers) {
53 virt_store_mb(*p, v);
54 } else {
55 WRITE_ONCE(*p, v);
56 mb();
57 }
58}
59
60struct virtio_device;
61struct virtqueue;
62
63
64
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66
67
68
69struct virtqueue *vring_create_virtqueue(unsigned int index,
70 unsigned int num,
71 unsigned int vring_align,
72 struct virtio_device *vdev,
73 bool weak_barriers,
74 bool may_reduce_num,
75 bool ctx,
76 bool (*notify)(struct virtqueue *vq),
77 void (*callback)(struct virtqueue *vq),
78 const char *name);
79
80
81struct virtqueue *__vring_new_virtqueue(unsigned int index,
82 struct vring vring,
83 struct virtio_device *vdev,
84 bool weak_barriers,
85 bool ctx,
86 bool (*notify)(struct virtqueue *),
87 void (*callback)(struct virtqueue *),
88 const char *name);
89
90
91
92
93
94struct virtqueue *vring_new_virtqueue(unsigned int index,
95 unsigned int num,
96 unsigned int vring_align,
97 struct virtio_device *vdev,
98 bool weak_barriers,
99 bool ctx,
100 void *pages,
101 bool (*notify)(struct virtqueue *vq),
102 void (*callback)(struct virtqueue *vq),
103 const char *name);
104
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108
109void vring_del_virtqueue(struct virtqueue *vq);
110
111
112void vring_transport_features(struct virtio_device *vdev);
113
114irqreturn_t vring_interrupt(int irq, void *_vq);
115#endif
116