]>
Commit | Line | Data |
---|---|---|
2d7ce0e8 MT |
1 | #include <linux/virtio_byteorder.h> |
2 | #include <linux/virtio.h> | |
3 | #include <uapi/linux/virtio_config.h> | |
4 | ||
5 | /* | |
6 | * __virtio_test_bit - helper to test feature bits. For use by transports. | |
7 | * Devices should normally use virtio_has_feature, | |
8 | * which includes more checks. | |
9 | * @vdev: the device | |
10 | * @fbit: the feature bit | |
11 | */ | |
12 | static inline bool __virtio_test_bit(const struct virtio_device *vdev, | |
13 | unsigned int fbit) | |
14 | { | |
15 | return vdev->features & (1ULL << fbit); | |
16 | } | |
17 | ||
18 | /** | |
19 | * __virtio_set_bit - helper to set feature bits. For use by transports. | |
20 | * @vdev: the device | |
21 | * @fbit: the feature bit | |
22 | */ | |
23 | static inline void __virtio_set_bit(struct virtio_device *vdev, | |
24 | unsigned int fbit) | |
25 | { | |
26 | vdev->features |= (1ULL << fbit); | |
27 | } | |
28 | ||
29 | /** | |
30 | * __virtio_clear_bit - helper to clear feature bits. For use by transports. | |
31 | * @vdev: the device | |
32 | * @fbit: the feature bit | |
33 | */ | |
34 | static inline void __virtio_clear_bit(struct virtio_device *vdev, | |
35 | unsigned int fbit) | |
36 | { | |
37 | vdev->features &= ~(1ULL << fbit); | |
38 | } | |
61d0b5a4 RR |
39 | |
40 | #define virtio_has_feature(dev, feature) \ | |
e16e12be | 41 | (__virtio_test_bit((dev), feature)) |
61d0b5a4 | 42 | |
6be3ffaa MT |
43 | /** |
44 | * virtio_has_iommu_quirk - determine whether this device has the iommu quirk | |
45 | * @vdev: the device | |
46 | */ | |
47 | static inline bool virtio_has_iommu_quirk(const struct virtio_device *vdev) | |
48 | { | |
49 | /* | |
50 | * Note the reverse polarity of the quirk feature (compared to most | |
51 | * other features), this is for compatibility with legacy systems. | |
52 | */ | |
53 | return !virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); | |
54 | } | |
55 | ||
55564a02 MT |
56 | static inline bool virtio_is_little_endian(struct virtio_device *vdev) |
57 | { | |
58 | return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) || | |
59 | virtio_legacy_is_little_endian(); | |
60 | } | |
61 | ||
62 | /* Memory accessors */ | |
2d7ce0e8 MT |
63 | static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val) |
64 | { | |
55564a02 | 65 | return __virtio16_to_cpu(virtio_is_little_endian(vdev), val); |
2d7ce0e8 MT |
66 | } |
67 | ||
68 | static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val) | |
69 | { | |
55564a02 | 70 | return __cpu_to_virtio16(virtio_is_little_endian(vdev), val); |
2d7ce0e8 MT |
71 | } |
72 | ||
73 | static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val) | |
74 | { | |
55564a02 | 75 | return __virtio32_to_cpu(virtio_is_little_endian(vdev), val); |
2d7ce0e8 MT |
76 | } |
77 | ||
78 | static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val) | |
79 | { | |
55564a02 | 80 | return __cpu_to_virtio32(virtio_is_little_endian(vdev), val); |
2d7ce0e8 MT |
81 | } |
82 | ||
83 | static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val) | |
84 | { | |
55564a02 | 85 | return __virtio64_to_cpu(virtio_is_little_endian(vdev), val); |
2d7ce0e8 MT |
86 | } |
87 | ||
88 | static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val) | |
89 | { | |
55564a02 | 90 | return __cpu_to_virtio64(virtio_is_little_endian(vdev), val); |
2d7ce0e8 | 91 | } |