Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <linux/virtio_byteorder.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/virtio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <uapi/linux/virtio_config.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * __virtio_test_bit - helper to test feature bits. For use by transports.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *                     Devices should normally use virtio_has_feature,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *                     which includes more checks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * @vdev: the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * @fbit: the feature bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) static inline bool __virtio_test_bit(const struct virtio_device *vdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 				     unsigned int fbit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	return vdev->features & (1ULL << fbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * __virtio_set_bit - helper to set feature bits. For use by transports.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * @vdev: the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * @fbit: the feature bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static inline void __virtio_set_bit(struct virtio_device *vdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 				    unsigned int fbit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	vdev->features |= (1ULL << fbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)  * __virtio_clear_bit - helper to clear feature bits. For use by transports.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  * @vdev: the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)  * @fbit: the feature bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static inline void __virtio_clear_bit(struct virtio_device *vdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 				      unsigned int fbit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	vdev->features &= ~(1ULL << fbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define virtio_has_feature(dev, feature) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	(__virtio_test_bit((dev), feature))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)  * virtio_has_dma_quirk - determine whether this device has the DMA quirk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)  * @vdev: the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static inline bool virtio_has_dma_quirk(const struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	 * Note the reverse polarity of the quirk feature (compared to most
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	 * other features), this is for compatibility with legacy systems.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	return !virtio_has_feature(vdev, VIRTIO_F_ACCESS_PLATFORM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static inline bool virtio_is_little_endian(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		virtio_legacy_is_little_endian();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /* Memory accessors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) 	return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }