1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Based on arch/arm/mm/flush.c |
4 | * |
5 | * Copyright (C) 1995-2002 Russell King |
6 | * Copyright (C) 2012 ARM Ltd. |
7 | */ |
8 | |
9 | #include <linux/export.h> |
10 | #include <linux/mm.h> |
11 | #include <linux/libnvdimm.h> |
12 | #include <linux/pagemap.h> |
13 | |
14 | #include <asm/cacheflush.h> |
15 | #include <asm/cache.h> |
16 | #include <asm/tlbflush.h> |
17 | |
18 | void sync_icache_aliases(unsigned long start, unsigned long end) |
19 | { |
20 | if (icache_is_aliasing()) { |
21 | dcache_clean_pou(start, end); |
22 | icache_inval_all_pou(); |
23 | } else { |
24 | /* |
25 | * Don't issue kick_all_cpus_sync() after I-cache invalidation |
26 | * for user mappings. |
27 | */ |
28 | caches_clean_inval_pou(start, end); |
29 | } |
30 | } |
31 | |
32 | static void flush_ptrace_access(struct vm_area_struct *vma, unsigned long start, |
33 | unsigned long end) |
34 | { |
35 | if (vma->vm_flags & VM_EXEC) |
36 | sync_icache_aliases(start, end); |
37 | } |
38 | |
39 | /* |
40 | * Copy user data from/to a page which is mapped into a different processes |
41 | * address space. Really, we want to allow our "user space" model to handle |
42 | * this. |
43 | */ |
44 | void copy_to_user_page(struct vm_area_struct *vma, struct page *page, |
45 | unsigned long uaddr, void *dst, const void *src, |
46 | unsigned long len) |
47 | { |
48 | memcpy(dst, src, len); |
49 | flush_ptrace_access(vma, (unsigned long)dst, (unsigned long)dst + len); |
50 | } |
51 | |
52 | void __sync_icache_dcache(pte_t pte) |
53 | { |
54 | struct folio *folio = page_folio(pte_page(pte)); |
55 | |
56 | if (!test_bit(PG_dcache_clean, &folio->flags)) { |
57 | sync_icache_aliases(start: (unsigned long)folio_address(folio), |
58 | end: (unsigned long)folio_address(folio) + |
59 | folio_size(folio)); |
60 | set_bit(nr: PG_dcache_clean, addr: &folio->flags); |
61 | } |
62 | } |
63 | EXPORT_SYMBOL_GPL(__sync_icache_dcache); |
64 | |
65 | /* |
66 | * This function is called when a page has been modified by the kernel. Mark |
67 | * it as dirty for later flushing when mapped in user space (if executable, |
68 | * see __sync_icache_dcache). |
69 | */ |
70 | void flush_dcache_folio(struct folio *folio) |
71 | { |
72 | if (test_bit(PG_dcache_clean, &folio->flags)) |
73 | clear_bit(nr: PG_dcache_clean, addr: &folio->flags); |
74 | } |
75 | EXPORT_SYMBOL(flush_dcache_folio); |
76 | |
77 | void flush_dcache_page(struct page *page) |
78 | { |
79 | flush_dcache_folio(page_folio(page)); |
80 | } |
81 | EXPORT_SYMBOL(flush_dcache_page); |
82 | |
83 | /* |
84 | * Additional functions defined in assembly. |
85 | */ |
86 | EXPORT_SYMBOL(caches_clean_inval_pou); |
87 | |
88 | #ifdef CONFIG_ARCH_HAS_PMEM_API |
89 | void arch_wb_cache_pmem(void *addr, size_t size) |
90 | { |
91 | /* Ensure order against any prior non-cacheable writes */ |
92 | dmb(osh); |
93 | dcache_clean_pop((unsigned long)addr, (unsigned long)addr + size); |
94 | } |
95 | EXPORT_SYMBOL_GPL(arch_wb_cache_pmem); |
96 | |
97 | void arch_invalidate_pmem(void *addr, size_t size) |
98 | { |
99 | dcache_inval_poc((unsigned long)addr, (unsigned long)addr + size); |
100 | } |
101 | EXPORT_SYMBOL_GPL(arch_invalidate_pmem); |
102 | #endif |
103 | |