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Message-Id: <1616658937-82063-3-git-send-email-guoren@kernel.org>
Date: Thu, 25 Mar 2021 07:55:35 +0000
From: guoren@...nel.org
To: guoren@...nel.org, Anup.Patel@....com
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-csky@...r.kernel.org, linux-arch@...r.kernel.org,
tech-unixplatformspec@...ts.riscv.org,
Guo Ren <guoren@...ux.alibaba.com>,
Peter Zijlstra <peterz@...radead.org>,
Michael Clark <michaeljclark@....com>,
Anup Patel <anup@...infault.org>,
Arnd Bergmann <arnd@...db.de>,
Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: [PATCH v3 2/4] riscv: cmpxchg.h: Merge macros
From: Guo Ren <guoren@...ux.alibaba.com>
To reduce assembly codes, let's merge duplicate codes into one
(xchg_acquire, xchg_release, cmpxchg_release).
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Link: https://lore.kernel.org/linux-riscv/CAJF2gTT1_mP-wiK2HsCpTeU61NqZVKZX1A5ye=TwqvGN4TPmrA@mail.gmail.com/
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Michael Clark <michaeljclark@....com>
Cc: Anup Patel <anup@...infault.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Palmer Dabbelt <palmerdabbelt@...gle.com>
---
arch/riscv/include/asm/cmpxchg.h | 92 +++++---------------------------
1 file changed, 12 insertions(+), 80 deletions(-)
diff --git a/arch/riscv/include/asm/cmpxchg.h b/arch/riscv/include/asm/cmpxchg.h
index f1383c15e16b..50513b95411d 100644
--- a/arch/riscv/include/asm/cmpxchg.h
+++ b/arch/riscv/include/asm/cmpxchg.h
@@ -11,6 +11,12 @@
#include <asm/barrier.h>
#include <asm/fence.h>
+#define __local_acquire_fence() \
+ __asm__ __volatile__(RISCV_ACQUIRE_BARRIER "" ::: "memory")
+
+#define __local_release_fence() \
+ __asm__ __volatile__(RISCV_RELEASE_BARRIER "" ::: "memory")
+
#define __xchg_relaxed(ptr, new, size) \
({ \
__typeof__(ptr) __ptr = (ptr); \
@@ -46,58 +52,16 @@
#define __xchg_acquire(ptr, new, size) \
({ \
- __typeof__(ptr) __ptr = (ptr); \
- __typeof__(new) __new = (new); \
__typeof__(*(ptr)) __ret; \
- switch (size) { \
- case 4: \
- __asm__ __volatile__ ( \
- " amoswap.w %0, %2, %1\n" \
- RISCV_ACQUIRE_BARRIER \
- : "=r" (__ret), "+A" (*__ptr) \
- : "r" (__new) \
- : "memory"); \
- break; \
- case 8: \
- __asm__ __volatile__ ( \
- " amoswap.d %0, %2, %1\n" \
- RISCV_ACQUIRE_BARRIER \
- : "=r" (__ret), "+A" (*__ptr) \
- : "r" (__new) \
- : "memory"); \
- break; \
- default: \
- BUILD_BUG(); \
- } \
+ __ret = __xchg_relaxed(ptr, new, size); \
+ __local_acquire_fence(); \
__ret; \
})
#define __xchg_release(ptr, new, size) \
({ \
- __typeof__(ptr) __ptr = (ptr); \
- __typeof__(new) __new = (new); \
- __typeof__(*(ptr)) __ret; \
- switch (size) { \
- case 4: \
- __asm__ __volatile__ ( \
- RISCV_RELEASE_BARRIER \
- " amoswap.w %0, %2, %1\n" \
- : "=r" (__ret), "+A" (*__ptr) \
- : "r" (__new) \
- : "memory"); \
- break; \
- case 8: \
- __asm__ __volatile__ ( \
- RISCV_RELEASE_BARRIER \
- " amoswap.d %0, %2, %1\n" \
- : "=r" (__ret), "+A" (*__ptr) \
- : "r" (__new) \
- : "memory"); \
- break; \
- default: \
- BUILD_BUG(); \
- } \
- __ret; \
+ __local_release_fence(); \
+ __xchg_relaxed(ptr, new, size); \
})
#define __xchg(ptr, new, size) \
@@ -215,40 +179,8 @@
#define __cmpxchg_release(ptr, old, new, size) \
({ \
- __typeof__(ptr) __ptr = (ptr); \
- __typeof__(*(ptr)) __old = (old); \
- __typeof__(*(ptr)) __new = (new); \
- __typeof__(*(ptr)) __ret; \
- register unsigned int __rc; \
- switch (size) { \
- case 4: \
- __asm__ __volatile__ ( \
- RISCV_RELEASE_BARRIER \
- "0: lr.w %0, %2\n" \
- " bne %0, %z3, 1f\n" \
- " sc.w %1, %z4, %2\n" \
- " bnez %1, 0b\n" \
- "1:\n" \
- : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
- : "rJ" ((long)__old), "rJ" (__new) \
- : "memory"); \
- break; \
- case 8: \
- __asm__ __volatile__ ( \
- RISCV_RELEASE_BARRIER \
- "0: lr.d %0, %2\n" \
- " bne %0, %z3, 1f\n" \
- " sc.d %1, %z4, %2\n" \
- " bnez %1, 0b\n" \
- "1:\n" \
- : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
- : "rJ" (__old), "rJ" (__new) \
- : "memory"); \
- break; \
- default: \
- BUILD_BUG(); \
- } \
- __ret; \
+ __local_release_fence(); \
+ __cmpxchg_relaxed(ptr, old, new, size); \
})
#define __cmpxchg(ptr, old, new, size) \
--
2.17.1
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