1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __ASM_LSE_H 3#define __ASM_LSE_H 4 5#include <asm/atomic_ll_sc.h> 6 7#ifdef CONFIG_ARM64_LSE_ATOMICS 8 9#define __LSE_PREAMBLE ".arch_extension lse\n" 10 11#include <linux/compiler_types.h> 12#include <linux/export.h> 13#include <linux/stringify.h> 14#include <asm/alternative.h> 15#include <asm/alternative-macros.h> 16#include <asm/atomic_lse.h> 17#include <asm/cpucaps.h> 18 19static __always_inline bool system_uses_lse_atomics(void) 20{ 21 return alternative_has_cap_likely(ARM64_HAS_LSE_ATOMICS); 22} 23 24#define __lse_ll_sc_body(op, ...) \ 25({ \ 26 system_uses_lse_atomics() ? \ 27 __lse_##op(__VA_ARGS__) : \ 28 __ll_sc_##op(__VA_ARGS__); \ 29}) 30 31/* In-line patching at runtime */ 32#define ARM64_LSE_ATOMIC_INSN(llsc, lse) \ 33 ALTERNATIVE(llsc, __LSE_PREAMBLE lse, ARM64_HAS_LSE_ATOMICS) 34 35#else /* CONFIG_ARM64_LSE_ATOMICS */ 36 37static inline bool system_uses_lse_atomics(void) { return false; } 38 39#define __lse_ll_sc_body(op, ...) __ll_sc_##op(__VA_ARGS__) 40 41#define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc 42 43#endif /* CONFIG_ARM64_LSE_ATOMICS */ 44#endif /* __ASM_LSE_H */ 45