From patchwork Fri Sep 7 16:26:47 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Catalin Marinas X-Patchwork-Id: 1424291 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id C5951DF283 for ; Fri, 7 Sep 2012 16:46:17 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TA1bo-0002P4-WB; Fri, 07 Sep 2012 16:40:46 +0000 Received: from service87.mimecast.com ([91.220.42.44]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TA1PQ-0002zr-1l for linux-arm-kernel@lists.infradead.org; Fri, 07 Sep 2012 16:28:46 +0000 Received: from cam-owa1.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.21]) by service87.mimecast.com; Fri, 07 Sep 2012 17:27:52 +0100 Received: from e102109-lin.cambridge.arm.com ([10.1.255.212]) by cam-owa1.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.0); Fri, 7 Sep 2012 17:27:52 +0100 From: Catalin Marinas To: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 12/31] arm64: Atomic operations Date: Fri, 7 Sep 2012 17:26:47 +0100 Message-Id: <1347035226-18649-13-git-send-email-catalin.marinas@arm.com> X-Mailer: git-send-email 1.7.9.111.gf3fb0 In-Reply-To: <1347035226-18649-1-git-send-email-catalin.marinas@arm.com> References: <1347035226-18649-1-git-send-email-catalin.marinas@arm.com> X-OriginalArrivalTime: 07 Sep 2012 16:27:52.0222 (UTC) FILETIME=[BA4053E0:01CD8D15] X-MC-Unique: 112090717275207001 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [91.220.42.44 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: linux-kernel@vger.kernel.org, Arnd Bergmann X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This patch introduces the atomic, mutex and futex operations. Many atomic operations use the load-acquire and store-release operations which imply barriers, avoiding the need for explicit DMB. Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas Acked-by: Tony Lindgren Acked-by: Arnd Bergmann --- arch/arm64/include/asm/atomic.h | 305 +++++++++++++++++++++++++++++++++++++++ arch/arm64/include/asm/futex.h | 136 +++++++++++++++++ 2 files changed, 441 insertions(+), 0 deletions(-) create mode 100644 arch/arm64/include/asm/atomic.h create mode 100644 arch/arm64/include/asm/futex.h diff --git a/arch/arm64/include/asm/atomic.h b/arch/arm64/include/asm/atomic.h new file mode 100644 index 0000000..407717b --- /dev/null +++ b/arch/arm64/include/asm/atomic.h @@ -0,0 +1,305 @@ +/* + * Based on arch/arm/include/asm/atomic.h + * + * Copyright (C) 1996 Russell King. + * Copyright (C) 2002 Deep Blue Solutions Ltd. + * Copyright (C) 2012 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ +#ifndef __ASM_ATOMIC_H +#define __ASM_ATOMIC_H + +#include +#include + +#include +#include + +#define ATOMIC_INIT(i) { (i) } + +#ifdef __KERNEL__ + +/* + * On ARM, ordinary assignment (str instruction) doesn't clear the local + * strex/ldrex monitor on some implementations. The reason we can use it for + * atomic_set() is the clrex or dummy strex done on every exception return. + */ +#define atomic_read(v) (*(volatile int *)&(v)->counter) +#define atomic_set(v,i) (((v)->counter) = (i)) + +/* + * AArch64 UP and SMP safe atomic ops. We use load exclusive and + * store exclusive to ensure that these are atomic. We may loop + * to ensure that the update happens. + */ +static inline void atomic_add(int i, atomic_t *v) +{ + unsigned long tmp; + int result; + + asm volatile("// atomic_add\n" +"1: ldxr %w0, [%3]\n" +" add %w0, %w0, %w4\n" +" stxr %w1, %w0, [%3]\n" +" cbnz %w1, 1b" + : "=&r" (result), "=&r" (tmp), "+o" (v->counter) + : "r" (&v->counter), "Ir" (i) + : "cc"); +} + +static inline int atomic_add_return(int i, atomic_t *v) +{ + unsigned long tmp; + int result; + + asm volatile("// atomic_add_return\n" +"1: ldaxr %w0, [%3]\n" +" add %w0, %w0, %w4\n" +" stlxr %w1, %w0, [%3]\n" +" cbnz %w1, 1b" + : "=&r" (result), "=&r" (tmp), "+o" (v->counter) + : "r" (&v->counter), "Ir" (i) + : "cc"); + + return result; +} + +static inline void atomic_sub(int i, atomic_t *v) +{ + unsigned long tmp; + int result; + + asm volatile("// atomic_sub\n" +"1: ldxr %w0, [%3]\n" +" sub %w0, %w0, %w4\n" +" stxr %w1, %w0, [%3]\n" +" cbnz %w1, 1b" + : "=&r" (result), "=&r" (tmp), "+o" (v->counter) + : "r" (&v->counter), "Ir" (i) + : "cc"); +} + +static inline int atomic_sub_return(int i, atomic_t *v) +{ + unsigned long tmp; + int result; + + asm volatile("// atomic_sub_return\n" +"1: ldaxr %w0, [%3]\n" +" sub %w0, %w0, %w4\n" +" stlxr %w1, %w0, [%3]\n" +" cbnz %w1, 1b" + : "=&r" (result), "=&r" (tmp), "+o" (v->counter) + : "r" (&v->counter), "Ir" (i) + : "cc"); + + return result; +} + +static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new) +{ + unsigned long tmp; + int oldval; + + asm volatile("// atomic_cmpxchg\n" +"1: ldaxr %w1, [%3]\n" +" cmp %w1, %w4\n" +" b.ne 2f\n" +" stlxr %w0, %w5, [%3]\n" +" cbnz %w0, 1b\n" +"2:" + : "=&r" (tmp), "=&r" (oldval), "+o" (ptr->counter) + : "r" (&ptr->counter), "Ir" (old), "r" (new) + : "cc"); + + return oldval; +} + +static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr) +{ + unsigned long tmp, tmp2; + + asm volatile("// atomic_clear_mask\n" +"1: ldxr %0, [%3]\n" +" bic %0, %0, %4\n" +" stxr %w1, %0, [%3]\n" +" cbnz %w1, 1b" + : "=&r" (tmp), "=&r" (tmp2), "+o" (*addr) + : "r" (addr), "Ir" (mask) + : "cc"); +} + +#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) + +static inline int __atomic_add_unless(atomic_t *v, int a, int u) +{ + int c, old; + + c = atomic_read(v); + while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c) + c = old; + return c; +} + +#define atomic_inc(v) atomic_add(1, v) +#define atomic_dec(v) atomic_sub(1, v) + +#define atomic_inc_and_test(v) (atomic_add_return(1, v) == 0) +#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0) +#define atomic_inc_return(v) (atomic_add_return(1, v)) +#define atomic_dec_return(v) (atomic_sub_return(1, v)) +#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0) + +#define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0) + +#define smp_mb__before_atomic_dec() smp_mb() +#define smp_mb__after_atomic_dec() smp_mb() +#define smp_mb__before_atomic_inc() smp_mb() +#define smp_mb__after_atomic_inc() smp_mb() + +/* + * 64-bit atomic operations. + */ +#define ATOMIC64_INIT(i) { (i) } + +#define atomic64_read(v) (*(volatile long long *)&(v)->counter) +#define atomic64_set(v,i) (((v)->counter) = (i)) + +static inline void atomic64_add(u64 i, atomic64_t *v) +{ + long result; + unsigned long tmp; + + asm volatile("// atomic64_add\n" +"1: ldxr %0, [%3]\n" +" add %0, %0, %4\n" +" stxr %w1, %0, [%3]\n" +" cbnz %w1, 1b" + : "=&r" (result), "=&r" (tmp), "+o" (v->counter) + : "r" (&v->counter), "Ir" (i) + : "cc"); +} + +static inline long atomic64_add_return(long i, atomic64_t *v) +{ + long result; + unsigned long tmp; + + asm volatile("// atomic64_add_return\n" +"1: ldaxr %0, [%3]\n" +" add %0, %0, %4\n" +" stlxr %w1, %0, [%3]\n" +" cbnz %w1, 1b" + : "=&r" (result), "=&r" (tmp), "+o" (v->counter) + : "r" (&v->counter), "Ir" (i) + : "cc"); + + return result; +} + +static inline void atomic64_sub(u64 i, atomic64_t *v) +{ + long result; + unsigned long tmp; + + asm volatile("// atomic64_sub\n" +"1: ldxr %0, [%3]\n" +" sub %0, %0, %4\n" +" stxr %w1, %0, [%3]\n" +" cbnz %w1, 1b" + : "=&r" (result), "=&r" (tmp), "+o" (v->counter) + : "r" (&v->counter), "Ir" (i) + : "cc"); +} + +static inline long atomic64_sub_return(long i, atomic64_t *v) +{ + long result; + unsigned long tmp; + + asm volatile("// atomic64_sub_return\n" +"1: ldaxr %0, [%3]\n" +" sub %0, %0, %4\n" +" stlxr %w1, %0, [%3]\n" +" cbnz %w1, 1b" + : "=&r" (result), "=&r" (tmp), "+o" (v->counter) + : "r" (&v->counter), "Ir" (i) + : "cc"); + + return result; +} + +static inline long atomic64_cmpxchg(atomic64_t *ptr, long old, long new) +{ + long oldval; + unsigned long res; + + asm volatile("// atomic64_cmpxchg\n" +"1: ldaxr %1, [%3]\n" +" cmp %1, %4\n" +" b.ne 2f\n" +" stlxr %w0, %5, [%3]\n" +" cbnz %w0, 1b\n" +"2:" + : "=&r" (res), "=&r" (oldval), "+o" (ptr->counter) + : "r" (&ptr->counter), "Ir" (old), "r" (new) + : "cc"); + + return oldval; +} + +#define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) + +static inline long atomic64_dec_if_positive(atomic64_t *v) +{ + long result; + unsigned long tmp; + + asm volatile("// atomic64_dec_if_positive\n" +"1: ldaxr %0, [%3]\n" +" subs %0, %0, #1\n" +" b.mi 2f\n" +" stlxr %w1, %0, [%3]\n" +" cbnz %w1, 1b\n" +"2:" + : "=&r" (result), "=&r" (tmp), "+o" (v->counter) + : "r" (&v->counter) + : "cc"); + + return result; +} + +static inline int atomic64_add_unless(atomic64_t *v, long a, long u) +{ + long c, old; + + c = atomic64_read(v); + while (c != u && (old = atomic64_cmpxchg((v), c, c + a)) != c) + c = old; + + return c != u; +} + +#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) +#define atomic64_inc(v) atomic64_add(1LL, (v)) +#define atomic64_inc_return(v) atomic64_add_return(1LL, (v)) +#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) +#define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0) +#define atomic64_dec(v) atomic64_sub(1LL, (v)) +#define atomic64_dec_return(v) atomic64_sub_return(1LL, (v)) +#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0) +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL) + +#endif +#endif diff --git a/arch/arm64/include/asm/futex.h b/arch/arm64/include/asm/futex.h new file mode 100644 index 0000000..3468ae8 --- /dev/null +++ b/arch/arm64/include/asm/futex.h @@ -0,0 +1,136 @@ +/* + * Copyright (C) 2012 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ +#ifndef __ASM_FUTEX_H +#define __ASM_FUTEX_H + +#ifdef __KERNEL__ + +#include +#include +#include + +#define __futex_atomic_op(insn, ret, oldval, uaddr, tmp, oparg) \ + asm volatile( \ +"1: ldaxr %w1, %2\n" \ + insn "\n" \ +"2: stlxr %w3, %w0, %2\n" \ +" cbnz %w3, 1b\n" \ +"3:\n" \ +" .pushsection .fixup,\"ax\"\n" \ +"4: mov %w0, %w5\n" \ +" b 3b\n" \ +" .popsection\n" \ +" .pushsection __ex_table,\"a\"\n" \ +" .align 3\n" \ +" .quad 1b, 4b, 2b, 4b\n" \ +" .popsection\n" \ + : "=&r" (ret), "=&r" (oldval), "+Q" (*uaddr), "=&r" (tmp) \ + : "r" (oparg), "Ir" (-EFAULT) \ + : "cc") + +static inline int +futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) +{ + int op = (encoded_op >> 28) & 7; + int cmp = (encoded_op >> 24) & 15; + int oparg = (encoded_op << 8) >> 20; + int cmparg = (encoded_op << 20) >> 20; + int oldval = 0, ret, tmp; + + if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) + oparg = 1 << oparg; + + if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) + return -EFAULT; + + pagefault_disable(); /* implies preempt_disable() */ + + switch (op) { + case FUTEX_OP_SET: + __futex_atomic_op("mov %w0, %w4", + ret, oldval, uaddr, tmp, oparg); + break; + case FUTEX_OP_ADD: + __futex_atomic_op("add %w0, %w1, %w4", + ret, oldval, uaddr, tmp, oparg); + break; + case FUTEX_OP_OR: + __futex_atomic_op("orr %w0, %w1, %w4", + ret, oldval, uaddr, tmp, oparg); + break; + case FUTEX_OP_ANDN: + __futex_atomic_op("and %w0, %w1, %w4", + ret, oldval, uaddr, tmp, ~oparg); + break; + case FUTEX_OP_XOR: + __futex_atomic_op("eor %w0, %w1, %w4", + ret, oldval, uaddr, tmp, oparg); + break; + default: + ret = -ENOSYS; + } + + pagefault_enable(); /* subsumes preempt_enable() */ + + if (!ret) { + switch (cmp) { + case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; + case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; + case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; + case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; + case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; + case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; + default: ret = -ENOSYS; + } + } + return ret; +} + +static inline int +futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, + u32 oldval, u32 newval) +{ + int ret = 0; + u32 val, tmp; + + if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) + return -EFAULT; + + asm volatile("// futex_atomic_cmpxchg_inatomic\n" +"1: ldaxr %w1, %2\n" +" sub %w3, %w1, %w4\n" +" cbnz %w3, 3f\n" +"2: stlxr %w3, %w5, %2\n" +" cbnz %w3, 1b\n" +"3:\n" +" .pushsection .fixup,\"ax\"\n" +"4: mov %w0, %w6\n" +" b 3b\n" +" .popsection\n" +" .pushsection __ex_table,\"a\"\n" +" .align 3\n" +" .quad 1b, 4b, 2b, 4b\n" +" .popsection\n" + : "+r" (ret), "=&r" (val), "+Q" (*uaddr), "=&r" (tmp) + : "r" (oldval), "r" (newval), "Ir" (-EFAULT) + : "cc", "memory"); + + *uval = val; + return ret; +} + +#endif /* __KERNEL__ */ +#endif /* __ASM_FUTEX_H */