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/jump_label.h> 14 #include <linux/stringify.h> 15 #include <asm/alternative.h> 16 #include <asm/alternative-macros.h> 17 #include <asm/atomic_lse.h> 18 #include <asm/cpucaps.h> 19 20 static __always_inline bool system_uses_lse_atomics(void) 21 { 22 return alternative_has_feature_likely(ARM64_HAS_LSE_ATOMICS); 23 } 24 25 #define __lse_ll_sc_body(op, ...) \ 26 ({ \ 27 system_uses_lse_atomics() ? \ 28 __lse_##op(__VA_ARGS__) : \ 29 __ll_sc_##op(__VA_ARGS__); \ 30 }) 31 32 /* In-line patching at runtime */ 33 #define ARM64_LSE_ATOMIC_INSN(llsc, lse) \ 34 ALTERNATIVE(llsc, __LSE_PREAMBLE lse, ARM64_HAS_LSE_ATOMICS) 35 36 #else /* CONFIG_ARM64_LSE_ATOMICS */ 37 38 static inline bool system_uses_lse_atomics(void) { return false; } 39 40 #define __lse_ll_sc_body(op, ...) __ll_sc_##op(__VA_ARGS__) 41 42 #define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc 43 44 #endif /* CONFIG_ARM64_LSE_ATOMICS */ 45 #endif /* __ASM_LSE_H */ 46