root/arch/arm64/include/asm/lse.h

INCLUDED FROM

DEFINITIONS

1. system_uses_lse_atomics
2. system_uses_lse_atomics

   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 #if defined(CONFIG_AS_LSE) && defined(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/atomic_lse.h>
  17 #include <asm/cpucaps.h>
  18 
  19 extern struct static_key_false cpu_hwcap_keys[ARM64_NCAPS];
  20 extern struct static_key_false arm64_const_caps_ready;
  21 
  22 static inline bool system_uses_lse_atomics(void)
  23 {
  24         return (static_branch_likely(&arm64_const_caps_ready)) &&
  25                 static_branch_likely(&cpu_hwcap_keys[ARM64_HAS_LSE_ATOMICS]);
  26 }
  27 
  28 #define __lse_ll_sc_body(op, ...)                                       \
  29 ({                                                                      \
  30         system_uses_lse_atomics() ?                                     \
  31                 __lse_##op(__VA_ARGS__) :                               \
  32                 __ll_sc_##op(__VA_ARGS__);                              \
  33 })
  34 
  35 /* In-line patching at runtime */
  36 #define ARM64_LSE_ATOMIC_INSN(llsc, lse)                                \
  37         ALTERNATIVE(llsc, __LSE_PREAMBLE lse, ARM64_HAS_LSE_ATOMICS)
  38 
  39 #else   /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
  40 
  41 static inline bool system_uses_lse_atomics(void) { return false; }
  42 
  43 #define __lse_ll_sc_body(op, ...)               __ll_sc_##op(__VA_ARGS__)
  44 
  45 #define ARM64_LSE_ATOMIC_INSN(llsc, lse)        llsc
  46 
  47 #endif  /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
  48 #endif  /* __ASM_LSE_H */