From c342f78217e822d2178265b0b1de232eeb717149 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Thu, 23 Apr 2015 20:08:49 +0100 Subject: arm64: cmpxchg: patch in lse instructions when supported by the CPU On CPUs which support the LSE atomic instructions introduced in ARMv8.1, it makes sense to use them in preference to ll/sc sequences. This patch introduces runtime patching of our cmpxchg primitives so that the LSE cas instruction is used instead. Reviewed-by: Catalin Marinas Signed-off-by: Will Deacon --- arch/arm64/include/asm/atomic_ll_sc.h | 38 +++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) (limited to 'arch/arm64/include/asm/atomic_ll_sc.h') diff --git a/arch/arm64/include/asm/atomic_ll_sc.h b/arch/arm64/include/asm/atomic_ll_sc.h index 4b981ba57e78..4864158d486e 100644 --- a/arch/arm64/include/asm/atomic_ll_sc.h +++ b/arch/arm64/include/asm/atomic_ll_sc.h @@ -215,4 +215,42 @@ __LL_SC_PREFIX(atomic64_dec_if_positive(atomic64_t *v)) } __LL_SC_EXPORT(atomic64_dec_if_positive); +#define __CMPXCHG_CASE(w, sz, name, mb, cl) \ +__LL_SC_INLINE unsigned long \ +__LL_SC_PREFIX(__cmpxchg_case_##name(volatile void *ptr, \ + unsigned long old, \ + unsigned long new)) \ +{ \ + unsigned long tmp, oldval; \ + \ + asm volatile( \ + " " #mb "\n" \ + "1: ldxr" #sz "\t%" #w "[oldval], %[v]\n" \ + " eor %" #w "[tmp], %" #w "[oldval], %" #w "[old]\n" \ + " cbnz %" #w "[tmp], 2f\n" \ + " stxr" #sz "\t%w[tmp], %" #w "[new], %[v]\n" \ + " cbnz %w[tmp], 1b\n" \ + " " #mb "\n" \ + " mov %" #w "[oldval], %" #w "[old]\n" \ + "2:" \ + : [tmp] "=&r" (tmp), [oldval] "=&r" (oldval), \ + [v] "+Q" (*(unsigned long *)ptr) \ + : [old] "Lr" (old), [new] "r" (new) \ + : cl); \ + \ + return oldval; \ +} \ +__LL_SC_EXPORT(__cmpxchg_case_##name); + +__CMPXCHG_CASE(w, b, 1, , ) +__CMPXCHG_CASE(w, h, 2, , ) +__CMPXCHG_CASE(w, , 4, , ) +__CMPXCHG_CASE( , , 8, , ) +__CMPXCHG_CASE(w, b, mb_1, dmb ish, "memory") +__CMPXCHG_CASE(w, h, mb_2, dmb ish, "memory") +__CMPXCHG_CASE(w, , mb_4, dmb ish, "memory") +__CMPXCHG_CASE( , , mb_8, dmb ish, "memory") + +#undef __CMPXCHG_CASE + #endif /* __ASM_ATOMIC_LL_SC_H */ -- cgit v1.2.3