2 * Copyright(c) 2015 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
17 #include <linux/uio.h>
19 #ifdef CONFIG_ARCH_HAS_PMEM_API
20 #define ARCH_MEMREMAP_PMEM MEMREMAP_WB
23 #define ARCH_MEMREMAP_PMEM MEMREMAP_WT
25 * These are simply here to enable compilation, all call sites gate
26 * calling these symbols with arch_has_pmem_api() and redirect to the
27 * implementation in asm/pmem.h.
29 static inline void arch_memcpy_to_pmem(void *dst, const void *src, size_t n)
35 static inline bool arch_has_pmem_api(void)
37 return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API);
41 * memcpy_to_pmem - copy data to persistent memory
42 * @dst: destination buffer for the copy
43 * @src: source buffer for the copy
44 * @n: length of the copy in bytes
46 * Perform a memory copy that results in the destination of the copy
47 * being effectively evicted from, or never written to, the processor
48 * cache hierarchy after the copy completes. After memcpy_to_pmem()
49 * data may still reside in cpu or platform buffers, so this operation
50 * must be followed by a blkdev_issue_flush() on the pmem block device.
52 static inline void memcpy_to_pmem(void *dst, const void *src, size_t n)
54 if (arch_has_pmem_api())
55 arch_memcpy_to_pmem(dst, src, n);
59 #endif /* __PMEM_H__ */