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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_KCSAN_CHECKS_H
#define _LINUX_KCSAN_CHECKS_H
#include <linux/types.h>
/*
* Access type modifiers.
*/
#define KCSAN_ACCESS_WRITE 0x1
#define KCSAN_ACCESS_ATOMIC 0x2
/*
* __kcsan_*: Always calls into runtime when KCSAN is enabled. This may be used
* even in compilation units that selectively disable KCSAN, but must use KCSAN
* to validate access to an address. Never use these in header files!
*/
#ifdef CONFIG_KCSAN
/**
* __kcsan_check_access - check generic access for data race
*
* @ptr address of access
* @size size of access
* @type access type modifier
*/
void __kcsan_check_access(const volatile void *ptr, size_t size, int type);
#else
static inline void __kcsan_check_access(const volatile void *ptr, size_t size,
int type) { }
#endif
/*
* kcsan_*: Only calls into runtime when the particular compilation unit has
* KCSAN instrumentation enabled. May be used in header files.
*/
#ifdef __SANITIZE_THREAD__
#define kcsan_check_access __kcsan_check_access
#else
static inline void kcsan_check_access(const volatile void *ptr, size_t size,
int type) { }
#endif
/**
* __kcsan_check_read - check regular read access for data races
*
* @ptr address of access
* @size size of access
*/
#define __kcsan_check_read(ptr, size) __kcsan_check_access(ptr, size, 0)
/**
* __kcsan_check_write - check regular write access for data races
*
* @ptr address of access
* @size size of access
*/
#define __kcsan_check_write(ptr, size) \
__kcsan_check_access(ptr, size, KCSAN_ACCESS_WRITE)
/**
* kcsan_check_read - check regular read access for data races
*
* @ptr address of access
* @size size of access
*/
#define kcsan_check_read(ptr, size) kcsan_check_access(ptr, size, 0)
/**
* kcsan_check_write - check regular write access for data races
*
* @ptr address of access
* @size size of access
*/
#define kcsan_check_write(ptr, size) \
kcsan_check_access(ptr, size, KCSAN_ACCESS_WRITE)
/*
* Check for atomic accesses: if atomic access are not ignored, this simply
* aliases to kcsan_check_access, otherwise becomes a no-op.
*/
#ifdef CONFIG_KCSAN_IGNORE_ATOMICS
#define kcsan_check_atomic_read(...) \
do { \
} while (0)
#define kcsan_check_atomic_write(...) \
do { \
} while (0)
#else
#define kcsan_check_atomic_read(ptr, size) \
kcsan_check_access(ptr, size, KCSAN_ACCESS_ATOMIC)
#define kcsan_check_atomic_write(ptr, size) \
kcsan_check_access(ptr, size, KCSAN_ACCESS_ATOMIC | KCSAN_ACCESS_WRITE)
#endif
#endif /* _LINUX_KCSAN_CHECKS_H */
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