/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_LSE_H #define __ASM_LSE_H #include <asm/atomic_ll_sc.h> #if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS) #include <linux/compiler_types.h> #include <linux/export.h> #include <linux/jump_label.h> #include <linux/stringify.h> #include <asm/alternative.h> #include <asm/atomic_lse.h> #include <asm/cpucaps.h> __asm__(".arch_extension lse"); extern struct static_key_false cpu_hwcap_keys[ARM64_NCAPS]; extern struct static_key_false arm64_const_caps_ready; static inline bool system_uses_lse_atomics(void) { return (static_branch_likely(&arm64_const_caps_ready)) && static_branch_likely(&cpu_hwcap_keys[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, ARM64_HAS_LSE_ATOMICS) #else /* CONFIG_AS_LSE && 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_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */ #endif /* __ASM_LSE_H */