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/pagemap.h>
12
13 #include <asm/cacheflush.h>
14 #include <asm/cache.h>
15 #include <asm/tlbflush.h>
16
sync_icache_aliases(unsigned long start,unsigned long end)17 void sync_icache_aliases(unsigned long start, unsigned long end)
18 {
19 if (icache_is_aliasing()) {
20 dcache_clean_pou(start, end);
21 icache_inval_all_pou();
22 } else {
23 /*
24 * Don't issue kick_all_cpus_sync() after I-cache invalidation
25 * for user mappings.
26 */
27 caches_clean_inval_pou(start, end);
28 }
29 }
30
flush_ptrace_access(struct vm_area_struct * vma,unsigned long start,unsigned long end)31 static void flush_ptrace_access(struct vm_area_struct *vma, unsigned long start,
32 unsigned long end)
33 {
34 if (vma->vm_flags & VM_EXEC)
35 sync_icache_aliases(start, end);
36 }
37
38 /*
39 * Copy user data from/to a page which is mapped into a different processes
40 * address space. Really, we want to allow our "user space" model to handle
41 * this.
42 */
copy_to_user_page(struct vm_area_struct * vma,struct page * page,unsigned long uaddr,void * dst,const void * src,unsigned long len)43 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
44 unsigned long uaddr, void *dst, const void *src,
45 unsigned long len)
46 {
47 memcpy(dst, src, len);
48 flush_ptrace_access(vma, (unsigned long)dst, (unsigned long)dst + len);
49 }
50
__sync_icache_dcache(pte_t pte)51 void __sync_icache_dcache(pte_t pte)
52 {
53 struct page *page = pte_page(pte);
54
55 /*
56 * HugeTLB pages are always fully mapped, so only setting head page's
57 * PG_dcache_clean flag is enough.
58 */
59 if (PageHuge(page))
60 page = compound_head(page);
61
62 if (!test_bit(PG_dcache_clean, &page->flags)) {
63 sync_icache_aliases((unsigned long)page_address(page),
64 (unsigned long)page_address(page) +
65 page_size(page));
66 set_bit(PG_dcache_clean, &page->flags);
67 }
68 }
69 EXPORT_SYMBOL_GPL(__sync_icache_dcache);
70
71 /*
72 * This function is called when a page has been modified by the kernel. Mark
73 * it as dirty for later flushing when mapped in user space (if executable,
74 * see __sync_icache_dcache).
75 */
flush_dcache_page(struct page * page)76 void flush_dcache_page(struct page *page)
77 {
78 /*
79 * HugeTLB pages are always fully mapped and only head page will be
80 * set PG_dcache_clean (see comments in __sync_icache_dcache()).
81 */
82 if (PageHuge(page))
83 page = compound_head(page);
84
85 if (test_bit(PG_dcache_clean, &page->flags))
86 clear_bit(PG_dcache_clean, &page->flags);
87 }
88 EXPORT_SYMBOL(flush_dcache_page);
89
90 /*
91 * Additional functions defined in assembly.
92 */
93 EXPORT_SYMBOL(caches_clean_inval_pou);
94
95 #ifdef CONFIG_ARCH_HAS_PMEM_API
arch_wb_cache_pmem(void * addr,size_t size)96 void arch_wb_cache_pmem(void *addr, size_t size)
97 {
98 /* Ensure order against any prior non-cacheable writes */
99 dmb(osh);
100 dcache_clean_pop((unsigned long)addr, (unsigned long)addr + size);
101 }
102 EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
103
arch_invalidate_pmem(void * addr,size_t size)104 void arch_invalidate_pmem(void *addr, size_t size)
105 {
106 dcache_inval_poc((unsigned long)addr, (unsigned long)addr + size);
107 }
108 EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
109 #endif
110