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)
34 static inline void arch_invalidate_pmem(void *addr, size_t size)
40 static inline bool arch_has_pmem_api(void)
42 return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API);
46 * memcpy_to_pmem - copy data to persistent memory
47 * @dst: destination buffer for the copy
48 * @src: source buffer for the copy
49 * @n: length of the copy in bytes
51 * Perform a memory copy that results in the destination of the copy
52 * being effectively evicted from, or never written to, the processor
53 * cache hierarchy after the copy completes. After memcpy_to_pmem()
54 * data may still reside in cpu or platform buffers, so this operation
55 * must be followed by a blkdev_issue_flush() on the pmem block device.
57 static inline void memcpy_to_pmem(void *dst, const void *src, size_t n)
59 if (arch_has_pmem_api())
60 arch_memcpy_to_pmem(dst, src, n);
66 * invalidate_pmem - flush a pmem range from the cache hierarchy
67 * @addr: virtual start address
68 * @size: bytes to invalidate (internally aligned to cache line size)
70 * For platforms that support clearing poison this flushes any poisoned
71 * ranges out of the cache
73 static inline void invalidate_pmem(void *addr, size_t size)
75 if (arch_has_pmem_api())
76 arch_invalidate_pmem(addr, size);
78 #endif /* __PMEM_H__ */