]> Git Repo - linux.git/blob - arch/arm64/include/asm/lse.h
Merge tag 'amd-drm-next-6.5-2023-06-09' of https://gitlab.freedesktop.org/agd5f/linux...
[linux.git] / arch / arm64 / include / asm / lse.h
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
19 static __always_inline bool system_uses_lse_atomics(void)
20 {
21         return alternative_has_feature_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
37 static 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 */
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