Contributors: 3
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Michael S. Tsirkin |
298 |
96.75% |
6 |
75.00% |
| Rusty Russell |
9 |
2.92% |
1 |
12.50% |
| Greg Kroah-Hartman |
1 |
0.32% |
1 |
12.50% |
| Total |
308 |
|
8 |
|
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/virtio_byteorder.h>
#include <linux/virtio.h>
#include <uapi/linux/virtio_config.h>
/*
* __virtio_test_bit - helper to test feature bits. For use by transports.
* Devices should normally use virtio_has_feature,
* which includes more checks.
* @vdev: the device
* @fbit: the feature bit
*/
static inline bool __virtio_test_bit(const struct virtio_device *vdev,
unsigned int fbit)
{
return vdev->features & (1ULL << fbit);
}
/**
* __virtio_set_bit - helper to set feature bits. For use by transports.
* @vdev: the device
* @fbit: the feature bit
*/
static inline void __virtio_set_bit(struct virtio_device *vdev,
unsigned int fbit)
{
vdev->features |= (1ULL << fbit);
}
/**
* __virtio_clear_bit - helper to clear feature bits. For use by transports.
* @vdev: the device
* @fbit: the feature bit
*/
static inline void __virtio_clear_bit(struct virtio_device *vdev,
unsigned int fbit)
{
vdev->features &= ~(1ULL << fbit);
}
#define virtio_has_feature(dev, feature) \
(__virtio_test_bit((dev), feature))
/**
* virtio_has_dma_quirk - determine whether this device has the DMA quirk
* @vdev: the device
*/
static inline bool virtio_has_dma_quirk(const struct virtio_device *vdev)
{
/*
* Note the reverse polarity of the quirk feature (compared to most
* other features), this is for compatibility with legacy systems.
*/
return !virtio_has_feature(vdev, VIRTIO_F_ACCESS_PLATFORM);
}
static inline bool virtio_is_little_endian(struct virtio_device *vdev)
{
return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
virtio_legacy_is_little_endian();
}
/* Memory accessors */
static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
{
return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
}
static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
{
return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
}
static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
{
return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
}
static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
{
return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
}
static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
{
return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
}
static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
{
return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
}