diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2026-09-21 19:35:45 -0300 |
|---|---|---|
| committer | Alex Williamson <alex@shazbot.org> | 2026-09-28 14:10:48 -0600 |
| commit | be0237a5f35df3518953075c375cc07fe09aef38 (patch) | |
| tree | 090de8e821c124d9d69d12027d81c334ae501ff6 /tools/include/asm-generic | |
| parent | 5f8e94a75a11661184de9e2d8aaeca095554c6f7 (diff) | |
selftests: Add additional kernel functions to tools/include/
These are needed by the VFIO mlx5 selftest in the following patches,
which includes some headers from mlx5 and also needs a few more
MMIO-related features.
- DECLARE_FLEX_ARRAY in new tools/include/linux/stddef.h (wraps
existing __DECLARE_FLEX_ARRAY from uapi/linux/stddef.h)
- dma_wmb/dma_rmb barriers: x86 uses compiler barrier
(DMA-coherent), arm64 uses dmb oshst/oshld (outer-shareable for
device visibility), generic fallback uses wmb/rmb
- ioread32be/iowrite32be in tools/include/asm-generic/io.h for
big-endian MMIO register access
Assisted-by: Claude:claude-opus-4.6
Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/5-v7-c6d30e8ce1e4+3dfa6-mlx5st_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex@shazbot.org>
Diffstat (limited to 'tools/include/asm-generic')
| -rw-r--r-- | tools/include/asm-generic/io.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/tools/include/asm-generic/io.h b/tools/include/asm-generic/io.h index e5a0b07ad452..0d89decdafb8 100644 --- a/tools/include/asm-generic/io.h +++ b/tools/include/asm-generic/io.h @@ -479,4 +479,32 @@ static inline void writesq(volatile void __iomem *addr, const void *buffer, } #endif +/* + * ioread/iowrite for big-endian MMIO registers. + */ + +#ifndef ioread32be +#define ioread32be ioread32be +static inline u32 ioread32be(const volatile void __iomem *addr) +{ + return bswap_32(readl(addr)); +} +#endif + +#ifndef iowrite32be +#define iowrite32be iowrite32be +static inline void iowrite32be(u32 value, volatile void __iomem *addr) +{ + writel(bswap_32(value), addr); +} +#endif + +#ifndef iowrite64be +#define iowrite64be iowrite64be +static inline void iowrite64be(u64 value, volatile void __iomem *addr) +{ + writeq(bswap_64(value), addr); +} +#endif + #endif /* _TOOLS_ASM_GENERIC_IO_H */ |