48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/*
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* Copyright(c) 2015 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#ifndef __ASM_X86_PMEM_H__
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#define __ASM_X86_PMEM_H__
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#include <linux/uaccess.h>
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#include <asm/cacheflush.h>
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#include <asm/cpufeature.h>
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#include <asm/special_insns.h>
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#ifdef CONFIG_ARCH_HAS_PMEM_API
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/**
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* arch_memcpy_to_pmem - copy data to persistent memory
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* @dst: destination buffer for the copy
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* @src: source buffer for the copy
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* @n: length of the copy in bytes
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*
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* Copy data to persistent memory media via non-temporal stores so that
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* a subsequent pmem driver flush operation will drain posted write queues.
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*/
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static inline void arch_memcpy_to_pmem(void *dst, const void *src, size_t n)
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{
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int rem;
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/*
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* We are copying between two kernel buffers, if
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* __copy_from_user_inatomic_nocache() returns an error (page
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* fault) we would have already reported a general protection fault
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* before the WARN+BUG.
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*/
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rem = __copy_from_user_inatomic_nocache(dst, (void __user *) src, n);
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if (WARN(rem, "%s: fault copying %p <- %p unwritten: %d\n",
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__func__, dst, src, rem))
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BUG();
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}
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#endif /* CONFIG_ARCH_HAS_PMEM_API */
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#endif /* __ASM_X86_PMEM_H__ */
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