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 */
__virtio_test_bit(const struct virtio_device * vdev,unsigned int fbit)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 */
__virtio_set_bit(struct virtio_device * vdev,unsigned int fbit)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 */
__virtio_clear_bit(struct virtio_device * vdev,unsigned int fbit)34 static inline void __virtio_clear_bit(struct virtio_device *vdev,
35 unsigned int fbit)
36 {
37 vdev->features &= ~(1ULL << fbit);
38 }
39
40 #define virtio_has_feature(dev, feature) \
41 (__virtio_test_bit((dev), feature))
42
43 /**
44 * virtio_has_iommu_quirk - determine whether this device has the iommu quirk
45 * @vdev: the device
46 */
virtio_has_iommu_quirk(const struct virtio_device * vdev)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
virtio_is_little_endian(struct virtio_device * vdev)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 */
virtio16_to_cpu(struct virtio_device * vdev,__virtio16 val)63 static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
64 {
65 return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
66 }
67
cpu_to_virtio16(struct virtio_device * vdev,u16 val)68 static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
69 {
70 return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
71 }
72
virtio32_to_cpu(struct virtio_device * vdev,__virtio32 val)73 static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
74 {
75 return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
76 }
77
cpu_to_virtio32(struct virtio_device * vdev,u32 val)78 static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
79 {
80 return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
81 }
82
virtio64_to_cpu(struct virtio_device * vdev,__virtio64 val)83 static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
84 {
85 return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
86 }
87
cpu_to_virtio64(struct virtio_device * vdev,u64 val)88 static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
89 {
90 return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
91 }
92