diff options
Diffstat (limited to 'arch/arm64/include/asm/lse.h')
| -rw-r--r-- | arch/arm64/include/asm/lse.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/lse.h b/arch/arm64/include/asm/lse.h new file mode 100644 index 0000000000..cbbcdc35c4 --- /dev/null +++ b/arch/arm64/include/asm/lse.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_LSE_H +#define __ASM_LSE_H + +#include <asm/atomic_ll_sc.h> + +#ifdef CONFIG_ARM64_LSE_ATOMICS + +#define __LSE_PREAMBLE ".arch_extension lse\n" + +#include <linux/compiler_types.h> +#include <linux/export.h> +#include <linux/stringify.h> +#include <asm/alternative.h> +#include <asm/alternative-macros.h> +#include <asm/atomic_lse.h> +#include <asm/cpucaps.h> + +static __always_inline bool system_uses_lse_atomics(void) +{ + return alternative_has_cap_likely(ARM64_HAS_LSE_ATOMICS); +} + +#define __lse_ll_sc_body(op, ...) \ +({ \ + system_uses_lse_atomics() ? \ + __lse_##op(__VA_ARGS__) : \ + __ll_sc_##op(__VA_ARGS__); \ +}) + +/* In-line patching at runtime */ +#define ARM64_LSE_ATOMIC_INSN(llsc, lse) \ + ALTERNATIVE(llsc, __LSE_PREAMBLE lse, ARM64_HAS_LSE_ATOMICS) + +#else /* CONFIG_ARM64_LSE_ATOMICS */ + +static inline bool system_uses_lse_atomics(void) { return false; } + +#define __lse_ll_sc_body(op, ...) __ll_sc_##op(__VA_ARGS__) + +#define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc + +#endif /* CONFIG_ARM64_LSE_ATOMICS */ +#endif /* __ASM_LSE_H */ |