2015-09-21 08:52:41 -07:00
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/*-
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* BSD LICENSE
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*
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2016-01-26 10:47:22 -07:00
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* Copyright (c) Intel Corporation.
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2017-10-10 14:19:16 +02:00
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* Copyright (c) 2017, IBM Corporation.
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2015-09-21 08:52:41 -07:00
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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2016-04-29 11:04:33 -07:00
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/** \file
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* Memory barriers
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*/
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2015-09-21 08:52:41 -07:00
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#ifndef SPDK_BARRIER_H
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#define SPDK_BARRIER_H
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2017-05-01 13:22:48 -07:00
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#include "spdk/stdinc.h"
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2016-02-12 07:52:35 -07:00
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#ifdef __cplusplus
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extern "C" {
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#endif
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2017-02-06 17:37:18 -07:00
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/** Compiler memory barrier */
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#define spdk_compiler_barrier() __asm volatile("" ::: "memory")
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2017-01-04 15:14:02 -07:00
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/** Write memory barrier */
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2017-10-10 14:19:16 +02:00
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#ifdef __PPC64__
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#define spdk_wmb() __asm volatile("sync" ::: "memory")
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2017-11-09 22:18:00 +02:00
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#elif defined(__aarch64__)
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#define spdk_wmb() __asm volatile("dsb st" ::: "memory")
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2017-11-08 16:28:58 -07:00
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#elif defined(__i386__) || defined(__x86_64__)
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2016-02-08 13:32:19 -07:00
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#define spdk_wmb() __asm volatile("sfence" ::: "memory")
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2017-11-08 16:28:58 -07:00
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#else
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#define spdk_wmb()
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#error Unknown architecture
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2017-10-10 14:19:16 +02:00
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#endif
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2017-01-04 15:14:02 -07:00
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/** Full read/write memory barrier */
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2017-10-10 14:19:16 +02:00
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#ifdef __PPC64__
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#define spdk_mb() __asm volatile("sync" ::: "memory")
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2017-11-09 22:18:00 +02:00
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#elif defined(__aarch64__)
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#define spdk_mb() __asm volatile("dsb sy" ::: "memory")
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2017-11-08 16:28:58 -07:00
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#elif defined(__i386__) || defined(__x86_64__)
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2016-02-08 13:32:19 -07:00
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#define spdk_mb() __asm volatile("mfence" ::: "memory")
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2017-11-08 16:28:58 -07:00
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#else
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#define spdk_mb()
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#error Unknown architecture
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2017-10-10 14:19:16 +02:00
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#endif
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2015-09-21 08:52:41 -07:00
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2017-11-23 13:35:15 +01:00
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/** SMP read memory barrier. */
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#ifdef __PPC64__
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#define spdk_smp_rmb() __asm volatile("lwsync" ::: "memory")
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#elif defined(__aarch64__)
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#define spdk_smp_rmb() __asm volatile("dmb ishld" ::: "memory")
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#elif defined(__i386__) || defined(__x86_64__)
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#define spdk_smp_rmb() spdk_compiler_barrier()
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#else
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#define spdk_smp_rmb()
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#error Unknown architecture
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#endif
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/** SMP write memory barrier. */
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#ifdef __PPC64__
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#define spdk_smp_wmb() __asm volatile("lwsync" ::: "memory")
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#elif defined(__aarch64__)
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#define spdk_smp_wmb() __asm volatile("dmb ishst" ::: "memory")
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#elif defined(__i386__) || defined(__x86_64__)
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#define spdk_smp_wmb() spdk_compiler_barrier()
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#else
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#define spdk_smp_wmb()
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#error Unknown architecture
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#endif
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/** SMP read/write memory barrier. */
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#ifdef __PPC64__
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#define spdk_smp_mb() spdk_mb()
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#elif defined(__aarch64__)
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#define spdk_smp_mb() __asm volatile("dmb ish" ::: "memory")
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#elif defined(__i386__) || defined(__x86_64__)
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#define spdk_smp_mb() spdk_mb()
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#else
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#define spdk_smp_mb()
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#error Unknown architecture
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#endif
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2016-02-12 07:52:35 -07:00
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#ifdef __cplusplus
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}
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#endif
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2015-09-21 08:52:41 -07:00
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#endif
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