1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright(c) 2017 IBM Corporation. All rights reserved.
 
 
 
 
 
 
 
 
 
 4 */
 5
 6#include <linux/string.h>
 7#include <linux/export.h>
 8#include <linux/uaccess.h>
 9#include <linux/libnvdimm.h>
10
11#include <asm/cacheflush.h>
12
13static inline void __clean_pmem_range(unsigned long start, unsigned long stop)
14{
15	unsigned long shift = l1_dcache_shift();
16	unsigned long bytes = l1_dcache_bytes();
17	void *addr = (void *)(start & ~(bytes - 1));
18	unsigned long size = stop - (unsigned long)addr + (bytes - 1);
19	unsigned long i;
20
21	for (i = 0; i < size >> shift; i++, addr += bytes)
22		asm volatile(PPC_DCBSTPS(%0, %1): :"i"(0), "r"(addr): "memory");
23}
24
25static inline void __flush_pmem_range(unsigned long start, unsigned long stop)
26{
27	unsigned long shift = l1_dcache_shift();
28	unsigned long bytes = l1_dcache_bytes();
29	void *addr = (void *)(start & ~(bytes - 1));
30	unsigned long size = stop - (unsigned long)addr + (bytes - 1);
31	unsigned long i;
32
33	for (i = 0; i < size >> shift; i++, addr += bytes)
34		asm volatile(PPC_DCBFPS(%0, %1): :"i"(0), "r"(addr): "memory");
35}
36
37static inline void clean_pmem_range(unsigned long start, unsigned long stop)
38{
39	if (cpu_has_feature(CPU_FTR_ARCH_207S))
40		return __clean_pmem_range(start, stop);
41}
42
43static inline void flush_pmem_range(unsigned long start, unsigned long stop)
44{
45	if (cpu_has_feature(CPU_FTR_ARCH_207S))
46		return __flush_pmem_range(start, stop);
47}
48
49/*
50 * CONFIG_ARCH_HAS_PMEM_API symbols
51 */
52void arch_wb_cache_pmem(void *addr, size_t size)
53{
54	unsigned long start = (unsigned long) addr;
55	clean_pmem_range(start, start + size);
56}
57EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
58
59void arch_invalidate_pmem(void *addr, size_t size)
60{
61	unsigned long start = (unsigned long) addr;
62	flush_pmem_range(start, start + size);
63}
64EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
65
66/*
67 * CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols
68 */
69long __copy_from_user_flushcache(void *dest, const void __user *src,
70		unsigned size)
71{
72	unsigned long copied, start = (unsigned long) dest;
73
74	copied = __copy_from_user(dest, src, size);
75	clean_pmem_range(start, start + size);
76
77	return copied;
78}
79
80void memcpy_flushcache(void *dest, const void *src, size_t size)
81{
82	unsigned long start = (unsigned long) dest;
83
84	memcpy(dest, src, size);
85	clean_pmem_range(start, start + size);
 
 
86}
87EXPORT_SYMBOL(memcpy_flushcache);
88
89void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
90	size_t len)
91{
92	memcpy_flushcache(to, page_to_virt(page) + offset, len);
93}
94EXPORT_SYMBOL(memcpy_page_flushcache);

 
 1/*
 2 * Copyright(c) 2017 IBM Corporation. All rights reserved.
 3 *
 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.
 7 *
 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.
12 */
13
14#include <linux/string.h>
15#include <linux/export.h>
16#include <linux/uaccess.h>
 
17
18#include <asm/cacheflush.h>
19
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
20/*
21 * CONFIG_ARCH_HAS_PMEM_API symbols
22 */
23void arch_wb_cache_pmem(void *addr, size_t size)
24{
25	unsigned long start = (unsigned long) addr;
26	flush_inval_dcache_range(start, start + size);
27}
28EXPORT_SYMBOL(arch_wb_cache_pmem);
29
30void arch_invalidate_pmem(void *addr, size_t size)
31{
32	unsigned long start = (unsigned long) addr;
33	flush_inval_dcache_range(start, start + size);
34}
35EXPORT_SYMBOL(arch_invalidate_pmem);
36
37/*
38 * CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols
39 */
40long __copy_from_user_flushcache(void *dest, const void __user *src,
41		unsigned size)
42{
43	unsigned long copied, start = (unsigned long) dest;
44
45	copied = __copy_from_user(dest, src, size);
46	flush_inval_dcache_range(start, start + size);
47
48	return copied;
49}
50
51void *memcpy_flushcache(void *dest, const void *src, size_t size)
52{
53	unsigned long start = (unsigned long) dest;
54
55	memcpy(dest, src, size);
56	flush_inval_dcache_range(start, start + size);
57
58	return dest;
59}
60EXPORT_SYMBOL(memcpy_flushcache);
61
62void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
63	size_t len)
64{
65	memcpy_flushcache(to, page_to_virt(page) + offset, len);
66}
67EXPORT_SYMBOL(memcpy_page_flushcache);