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4e4f00a9b5
With all handling of the CONFIG_ARCH_HAS_PMEM_API case being moved to libnvdimm and the pmem driver directly we do not need to provide global wrappers and fallbacks in the CONFIG_ARCH_HAS_PMEM_API=n case. The pmem driver will simply not link to arch_wb_cache_pmem() in that case. Same as before, pmem flushing is only defined for x86_64, via clean_cache_range(), but it is straightforward to add other archs in the future. arch_wb_cache_pmem() is an exported function since the pmem module needs to find it, but it is privately declared in drivers/nvdimm/pmem.h because there are no consumers outside of the pmem driver. Cc: <x86@kernel.org> Cc: Jan Kara <jack@suse.cz> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Oliver O'Halloran <oohall@gmail.com> Cc: Matthew Wilcox <mawilcox@microsoft.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
52 lines
1.7 KiB
C
52 lines
1.7 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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static inline void arch_invalidate_pmem(void *addr, size_t size)
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{
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clflush_cache_range(addr, size);
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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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