diff options
Diffstat (limited to 'arch/arm64/include/asm/lse.h')
| -rw-r--r-- | arch/arm64/include/asm/lse.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/lse.h b/arch/arm64/include/asm/lse.h index 08e818e53ed7..80b388278149 100644 --- a/arch/arm64/include/asm/lse.h +++ b/arch/arm64/include/asm/lse.h @@ -2,22 +2,46 @@ #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 */ |