virtio_config: LE config space accessors (e598960f) · Commits · 戴 / test

include/linux/virtio_config.h

+65 −0

Original line number	Diff line number	Diff line
		@@ -375,6 +375,71 @@ static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
		sizeof(virtio_cwrite_v)); \
		} while(0)

		/*
		* Nothing virtio-specific about these, but let's worry about generalizing
		* these later.
		*/
		#define virtio_le_to_cpu(x) \
		_Generic((x), \
		__u8: (x), \
		__le16: le16_to_cpu(x), \
		__le32: le32_to_cpu(x), \
		__le64: le64_to_cpu(x) \
		)

		#define virtio_cpu_to_le(x, m) \
		_Generic((m), \
		__u8: (x), \
		__le16: cpu_to_le16(x), \
		__le32: cpu_to_le32(x), \
		__le64: cpu_to_le64(x) \
		)

		/* LE (e.g. modern) Config space accessors. */
		#define virtio_cread_le(vdev, structname, member, ptr) \
		do { \
		typeof(((structname*)0)->member) virtio_cread_v; \
		\
		might_sleep(); \
		/* Sanity check: must match the member's type */ \
		typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \
		\
		switch (sizeof(virtio_cread_v)) { \
		case 1: \
		case 2: \
		case 4: \
		vdev->config->get((vdev), \
		offsetof(structname, member), \
		&virtio_cread_v, \
		sizeof(virtio_cread_v)); \
		break; \
		default: \
		__virtio_cread_many((vdev), \
		offsetof(structname, member), \
		&virtio_cread_v, \
		1, \
		sizeof(virtio_cread_v)); \
		break; \
		} \
		*(ptr) = virtio_le_to_cpu(virtio_cread_v); \
		} while(0)

		/* Config space accessors. */
		#define virtio_cwrite_le(vdev, structname, member, ptr) \
		do { \
		typeof(((structname*)0)->member) virtio_cwrite_v = \
		virtio_cpu_to_le((ptr), ((structname)0)->member); \
		\
		might_sleep(); \
		/* Sanity check: must match the member's type */ \
		typecheck(typeof(virtio_le_to_cpu(virtio_cwrite_v)), *(ptr)); \
		\
		vdev->config->set((vdev), offsetof(structname, member), \
		&virtio_cwrite_v, \
		sizeof(virtio_cwrite_v)); \
		} while(0)


		/* Read @count fields, @bytes each. */
		static inline void __virtio_cread_many(struct virtio_device *vdev,
		unsigned int offset,

Admin message