diff options
| author | Robin Murphy <robin.murphy@arm.com> | 2017-07-25 12:55:43 +0200 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2017-08-09 13:16:26 +0200 |
| commit | 5d7bdeb1eeb250222304cb7b8126892cc47980a8 (patch) | |
| tree | 56e29a0d8285c6a33cd8a991007207f56414af01 /arch/arm64/include | |
| parent | arm64: Implement pmem API support (diff) | |
| download | linux-5d7bdeb1eeb250222304cb7b8126892cc47980a8.tar.xz linux-5d7bdeb1eeb250222304cb7b8126892cc47980a8.zip | |
arm64: uaccess: Implement *_flushcache variants
Implement the set of copy functions with guarantees of a clean cache
upon completion necessary to support the pmem driver.
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/string.h | 4 | ||||
| -rw-r--r-- | arch/arm64/include/asm/uaccess.h | 12 |
2 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/string.h b/arch/arm64/include/asm/string.h index d0aa42907569..dd95d33a5bd5 100644 --- a/arch/arm64/include/asm/string.h +++ b/arch/arm64/include/asm/string.h @@ -52,6 +52,10 @@ extern void *__memset(void *, int, __kernel_size_t); #define __HAVE_ARCH_MEMCMP extern int memcmp(const void *, const void *, size_t); +#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE +#define __HAVE_ARCH_MEMCPY_FLUSHCACHE +void memcpy_flushcache(void *dst, const void *src, size_t cnt); +#endif #if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__) diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index fab46a0ea223..bf8435deb8a1 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -347,4 +347,16 @@ extern long strncpy_from_user(char *dest, const char __user *src, long count); extern __must_check long strnlen_user(const char __user *str, long n); +#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE +struct page; +void memcpy_page_flushcache(char *to, struct page *page, size_t offset, size_t len); +extern unsigned long __must_check __copy_user_flushcache(void *to, const void __user *from, unsigned long n); + +static inline int __copy_from_user_flushcache(void *dst, const void __user *src, unsigned size) +{ + kasan_check_write(dst, size); + return __copy_user_flushcache(dst, src, size); +} +#endif + #endif /* __ASM_UACCESS_H */ |