csky: Fixup 610 vipt cache flush mechanism
[sfrench/cifs-2.6.git] / arch / csky / abiv1 / cacheflush.c
1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4 #include <linux/kernel.h>
5 #include <linux/mm.h>
6 #include <linux/fs.h>
7 #include <linux/syscalls.h>
8 #include <linux/spinlock.h>
9 #include <asm/page.h>
10 #include <asm/cache.h>
11 #include <asm/cacheflush.h>
12 #include <asm/cachectl.h>
13
14 #define PG_dcache_clean         PG_arch_1
15
16 void flush_dcache_page(struct page *page)
17 {
18         struct address_space *mapping;
19
20         if (page == ZERO_PAGE(0))
21                 return;
22
23         mapping = page_mapping_file(page);
24
25         if (mapping && !page_mapcount(page))
26                 clear_bit(PG_dcache_clean, &page->flags);
27         else {
28                 dcache_wbinv_all();
29                 if (mapping)
30                         icache_inv_all();
31                 set_bit(PG_dcache_clean, &page->flags);
32         }
33 }
34 EXPORT_SYMBOL(flush_dcache_page);
35
36 void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
37         pte_t *ptep)
38 {
39         unsigned long pfn = pte_pfn(*ptep);
40         struct page *page;
41
42         if (!pfn_valid(pfn))
43                 return;
44
45         page = pfn_to_page(pfn);
46         if (page == ZERO_PAGE(0))
47                 return;
48
49         if (!test_and_set_bit(PG_dcache_clean, &page->flags))
50                 dcache_wbinv_all();
51
52         if (page_mapping_file(page)) {
53                 if (vma->vm_flags & VM_EXEC)
54                         icache_inv_all();
55         }
56 }
57
58 void flush_kernel_dcache_page(struct page *page)
59 {
60         struct address_space *mapping;
61
62         mapping = page_mapping_file(page);
63
64         if (!mapping || mapping_mapped(mapping))
65                 dcache_wbinv_all();
66 }
67 EXPORT_SYMBOL(flush_kernel_dcache_page);
68
69 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
70         unsigned long end)
71 {
72         dcache_wbinv_all();
73
74         if (vma->vm_flags & VM_EXEC)
75                 icache_inv_all();
76 }