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(void * kaddr,unsigned long len)17 void sync_icache_aliases(void *kaddr, unsigned long len)
18 {
19 unsigned long addr = (unsigned long)kaddr;
20
21 if (icache_is_aliasing()) {
22 __clean_dcache_area_pou(kaddr, len);
23 __flush_icache_all();
24 } else {
25 /*
26 * Don't issue kick_all_cpus_sync() after I-cache invalidation
27 * for user mappings.
28 */
29 __flush_icache_range(addr, addr + len);
30 }
31 }
32
flush_ptrace_access(struct vm_area_struct * vma,struct page * page,unsigned long uaddr,void * kaddr,unsigned long len)33 static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
34 unsigned long uaddr, void *kaddr,
35 unsigned long len)
36 {
37 if (vma->vm_flags & VM_EXEC)
38 sync_icache_aliases(kaddr, len);
39 }
40
41 /*
42 * Copy user data from/to a page which is mapped into a different processes
43 * address space. Really, we want to allow our "user space" model to handle
44 * this.
45 */
copy_to_user_page(struct vm_area_struct * vma,struct page * page,unsigned long uaddr,void * dst,const void * src,unsigned long len)46 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
47 unsigned long uaddr, void *dst, const void *src,
48 unsigned long len)
49 {
50 memcpy(dst, src, len);
51 flush_ptrace_access(vma, page, uaddr, dst, len);
52 }
53
__sync_icache_dcache(pte_t pte)54 void __sync_icache_dcache(pte_t pte)
55 {
56 struct page *page = pte_page(pte);
57
58 if (!test_bit(PG_dcache_clean, &page->flags)) {
59 sync_icache_aliases(page_address(page), page_size(page));
60 set_bit(PG_dcache_clean, &page->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 */
flush_dcache_page(struct page * page)70 void flush_dcache_page(struct page *page)
71 {
72 if (test_bit(PG_dcache_clean, &page->flags))
73 clear_bit(PG_dcache_clean, &page->flags);
74 }
75 EXPORT_SYMBOL(flush_dcache_page);
76
77 /*
78 * Additional functions defined in assembly.
79 */
80 EXPORT_SYMBOL(__flush_icache_range);
81
82 #ifdef CONFIG_ARCH_HAS_PMEM_API
arch_wb_cache_pmem(void * addr,size_t size)83 void arch_wb_cache_pmem(void *addr, size_t size)
84 {
85 /* Ensure order against any prior non-cacheable writes */
86 dmb(osh);
87 __clean_dcache_area_pop(addr, size);
88 }
89 EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
90
arch_invalidate_pmem(void * addr,size_t size)91 void arch_invalidate_pmem(void *addr, size_t size)
92 {
93 __inval_dcache_area(addr, size);
94 }
95 EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
96 #endif
97