| /* |
| * 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 __ASM_X86_PMEM_H__ |
| #define __ASM_X86_PMEM_H__ |
| |
| #include <linux/uaccess.h> |
| #include <asm/cacheflush.h> |
| #include <asm/cpufeature.h> |
| #include <asm/special_insns.h> |
| |
| #ifdef CONFIG_ARCH_HAS_PMEM_API |
| /** |
| * arch_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 |
| * |
| * Copy data to persistent memory media via non-temporal stores so that |
| * a subsequent pmem driver flush operation will drain posted write queues. |
| */ |
| static inline void arch_memcpy_to_pmem(void *dst, const void *src, size_t n) |
| { |
| int rem; |
| |
| /* |
| * We are copying between two kernel buffers, if |
| * __copy_from_user_inatomic_nocache() returns an error (page |
| * fault) we would have already reported a general protection fault |
| * before the WARN+BUG. |
| */ |
| rem = __copy_from_user_inatomic_nocache(dst, (void __user *) src, n); |
| if (WARN(rem, "%s: fault copying %p <- %p unwritten: %d\n", |
| __func__, dst, src, rem)) |
| BUG(); |
| } |
| #endif /* CONFIG_ARCH_HAS_PMEM_API */ |
| #endif /* __ASM_X86_PMEM_H__ */ |