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 | |
13 | static 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 | |
25 | static 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 | |
37 | static 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 | |
43 | static 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 | */ |
52 | void arch_wb_cache_pmem(void *addr, size_t size) |
53 | { |
54 | unsigned long start = (unsigned long) addr; |
55 | clean_pmem_range(start, stop: start + size); |
56 | } |
57 | EXPORT_SYMBOL_GPL(arch_wb_cache_pmem); |
58 | |
59 | void arch_invalidate_pmem(void *addr, size_t size) |
60 | { |
61 | unsigned long start = (unsigned long) addr; |
62 | flush_pmem_range(start, stop: start + size); |
63 | } |
64 | EXPORT_SYMBOL_GPL(arch_invalidate_pmem); |
65 | |
66 | /* |
67 | * CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols |
68 | */ |
69 | long __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(to: dest, from: src, n: size); |
75 | clean_pmem_range(start, stop: start + size); |
76 | |
77 | return copied; |
78 | } |
79 | |
80 | void 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, stop: start + size); |
86 | } |
87 | EXPORT_SYMBOL(memcpy_flushcache); |
88 | |