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virtio_config: LE config space accessors 

To be used by modern code, as well as to handle LE only fields such as
balloon.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
zero-sugar-mainline-defconfig
Michael S. Tsirkin 2020-08-04 17:33:08 -04:00
parent 14191c15ab
commit e598960ff5
1 changed files with 65 additions and 0 deletions
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65
include/linux/virtio_config.h
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@ -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,