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/*
* Copyright(c) 2015 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License 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.
*/
#ifndef __PMEM_H__
#define __PMEM_H__
#include <linux/io.h>
#include <linux/uio.h>
#ifdef CONFIG_ARCH_HAS_PMEM_API
#define ARCH_MEMREMAP_PMEM MEMREMAP_WB
#include <asm/pmem.h>
#else
#define ARCH_MEMREMAP_PMEM MEMREMAP_WT
/*
* These are simply here to enable compilation, all call sites gate
* calling these symbols with arch_has_pmem_api() and redirect to the
* implementation in asm/pmem.h.
*/
static inline void arch_memcpy_to_pmem(void *dst, const void *src, size_t n)
{
BUG();
}
static inline void arch_invalidate_pmem(void *addr, size_t size)
{
BUG();
}
#endif
static inline bool arch_has_pmem_api(void)
{
return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API);
}
/**
* memcpy_to_pmem - copy data to persistent memory
* @dst: destination buffer for the copy
* @src: source buffer for the copy
* @n: length of the copy in bytes
*
* Perform a memory copy that results in the destination of the copy
* being effectively evicted from, or never written to, the processor
* cache hierarchy after the copy completes. After memcpy_to_pmem()
* data may still reside in cpu or platform buffers, so this operation
* must be followed by a blkdev_issue_flush() on the pmem block device.
*/
static inline void memcpy_to_pmem(void *dst, const void *src, size_t n)
{
if (arch_has_pmem_api())
arch_memcpy_to_pmem(dst, src, n);
else
memcpy(dst, src, n);
}
/**
* invalidate_pmem - flush a pmem range from the cache hierarchy
* @addr: virtual start address
* @size: bytes to invalidate (internally aligned to cache line size)
*
* For platforms that support clearing poison this flushes any poisoned
* ranges out of the cache
*/
static inline void invalidate_pmem(void *addr, size_t size)
{
if (arch_has_pmem_api())
arch_invalidate_pmem(addr, size);
}
#endif /* __PMEM_H__ */
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