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);

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