1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2009, Wind River Systems Inc
7 * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
8 */
9
10 #include <linux/export.h>
11 #include <linux/sched.h>
12 #include <linux/mm.h>
13 #include <linux/fs.h>
14 #include <linux/pagemap.h>
15
16 #include <asm/cacheflush.h>
17 #include <asm/cpuinfo.h>
18
19 static void __flush_dcache(unsigned long start, unsigned long end)
20 {
21 unsigned long addr;
22
23 start &= ~(cpuinfo.dcache_line_size - 1);
24 end += (cpuinfo.dcache_line_size - 1);
25 end &= ~(cpuinfo.dcache_line_size - 1);
26
27 if (end > start + cpuinfo.dcache_size)
28 end = start + cpuinfo.dcache_size;
29
30 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
31 __asm__ __volatile__ (" flushd 0(%0)\n"
32 : /* Outputs */
33 : /* Inputs */ "r"(addr)
34 /* : No clobber */);
35 }
36 }
37
38 static void __invalidate_dcache(unsigned long start, unsigned long end)
39 {
40 unsigned long addr;
41
42 start &= ~(cpuinfo.dcache_line_size - 1);
43 end += (cpuinfo.dcache_line_size - 1);
44 end &= ~(cpuinfo.dcache_line_size - 1);
45
46 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
47 __asm__ __volatile__ (" initda 0(%0)\n"
48 : /* Outputs */
49 : /* Inputs */ "r"(addr)
50 /* : No clobber */);
51 }
52 }
53
54 static void __flush_icache(unsigned long start, unsigned long end)
55 {
56 unsigned long addr;
57
58 start &= ~(cpuinfo.icache_line_size - 1);
59 end += (cpuinfo.icache_line_size - 1);
60 end &= ~(cpuinfo.icache_line_size - 1);
61
62 if (end > start + cpuinfo.icache_size)
63 end = start + cpuinfo.icache_size;
64
65 for (addr = start; addr < end; addr += cpuinfo.icache_line_size) {
66 __asm__ __volatile__ (" flushi %0\n"
67 : /* Outputs */
68 : /* Inputs */ "r"(addr)
69 /* : No clobber */);
70 }
71 __asm__ __volatile(" flushp\n");
72 }
73
74 static void flush_aliases(struct address_space *mapping, struct folio *folio)
75 {
76 struct mm_struct *mm = current->active_mm;
77 struct vm_area_struct *vma;
78 unsigned long flags;
79 pgoff_t pgoff;
80 unsigned long nr = folio_nr_pages(folio);
81
82 pgoff = folio->index;
83
84 flush_dcache_mmap_lock_irqsave(mapping, flags);
85 vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff + nr - 1) {
86 unsigned long start;
87
88 if (vma->vm_mm != mm)
89 continue;
90 if (!(vma->vm_flags & VM_MAYSHARE))
91 continue;
92
93 start = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
94 flush_cache_range(vma, start, start + nr * PAGE_SIZE);
95 }
96 flush_dcache_mmap_unlock_irqrestore(mapping, flags);
97 }
98
99 void flush_cache_all(void)
100 {
101 __flush_dcache(0, cpuinfo.dcache_size);
102 __flush_icache(0, cpuinfo.icache_size);
103 }
104
105 void flush_cache_mm(struct mm_struct *mm)
106 {
107 flush_cache_all();
108 }
109
110 void flush_cache_dup_mm(struct mm_struct *mm)
111 {
112 flush_cache_all();
113 }
114
115 void flush_icache_range(unsigned long start, unsigned long end)
116 {
117 __flush_dcache(start, end);
118 __flush_icache(start, end);
119 }
120
121 void flush_dcache_range(unsigned long start, unsigned long end)
122 {
123 __flush_dcache(start, end);
124 __flush_icache(start, end);
125 }
126 EXPORT_SYMBOL(flush_dcache_range);
127
128 void invalidate_dcache_range(unsigned long start, unsigned long end)
129 {
130 __invalidate_dcache(start, end);
131 }
132 EXPORT_SYMBOL(invalidate_dcache_range);
133
134 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
135 unsigned long end)
136 {
137 __flush_dcache(start, end);
138 if (vma == NULL || (vma->vm_flags & VM_EXEC))
139 __flush_icache(start, end);
140 }
141
142 void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
143 unsigned int nr)
144 {
145 unsigned long start = (unsigned long) page_address(page);
146 unsigned long end = start + nr * PAGE_SIZE;
147
148 __flush_dcache(start, end);
149 __flush_icache(start, end);
150 }
151
152 void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
153 unsigned long pfn)
154 {
155 unsigned long start = vmaddr;
156 unsigned long end = start + PAGE_SIZE;
157
158 __flush_dcache(start, end);
159 if (vma->vm_flags & VM_EXEC)
160 __flush_icache(start, end);
161 }
162
163 static void __flush_dcache_folio(struct folio *folio)
164 {
165 /*
166 * Writeback any data associated with the kernel mapping of this
167 * page. This ensures that data in the physical page is mutually
168 * coherent with the kernels mapping.
169 */
170 unsigned long start = (unsigned long)folio_address(folio);
171
172 __flush_dcache(start, start + folio_size(folio));
173 }
174
175 void flush_dcache_folio(struct folio *folio)
176 {
177 struct address_space *mapping;
178
179 /*
180 * The zero page is never written to, so never has any dirty
181 * cache lines, and therefore never needs to be flushed.
182 */
183 if (is_zero_pfn(folio_pfn(folio)))
184 return;
185
186 mapping = folio_flush_mapping(folio);
187
188 /* Flush this page if there are aliases. */
189 if (mapping && !mapping_mapped(mapping)) {
190 clear_bit(PG_dcache_clean, &folio->flags);
191 } else {
192 __flush_dcache_folio(folio);
193 if (mapping) {
194 unsigned long start = (unsigned long)folio_address(folio);
195 flush_aliases(mapping, folio);
196 flush_icache_range(start, start + folio_size(folio));
197 }
198 set_bit(PG_dcache_clean, &folio->flags);
199 }
200 }
201 EXPORT_SYMBOL(flush_dcache_folio);
202
203 void flush_dcache_page(struct page *page)
204 {
205 flush_dcache_folio(page_folio(page));
206 }
207 EXPORT_SYMBOL(flush_dcache_page);
208
209 void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
210 unsigned long address, pte_t *ptep, unsigned int nr)
211 {
212 pte_t pte = *ptep;
213 unsigned long pfn = pte_pfn(pte);
214 struct folio *folio;
215 struct address_space *mapping;
216
217 reload_tlb_page(vma, address, pte);
218
219 if (!pfn_valid(pfn))
220 return;
221
222 /*
223 * The zero page is never written to, so never has any dirty
224 * cache lines, and therefore never needs to be flushed.
225 */
226 if (is_zero_pfn(pfn))
227 return;
228
229 folio = page_folio(pfn_to_page(pfn));
230 if (!test_and_set_bit(PG_dcache_clean, &folio->flags))
231 __flush_dcache_folio(folio);
232
233 mapping = folio_flush_mapping(folio);
234 if (mapping) {
235 flush_aliases(mapping, folio);
236 if (vma->vm_flags & VM_EXEC)
237 flush_icache_pages(vma, &folio->page,
238 folio_nr_pages(folio));
239 }
240 }
241
242 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
243 struct page *to)
244 {
245 __flush_dcache(vaddr, vaddr + PAGE_SIZE);
246 __flush_icache(vaddr, vaddr + PAGE_SIZE);
247 copy_page(vto, vfrom);
248 __flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
249 __flush_icache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
250 }
251
252 void clear_user_page(void *addr, unsigned long vaddr, struct page *page)
253 {
254 __flush_dcache(vaddr, vaddr + PAGE_SIZE);
255 __flush_icache(vaddr, vaddr + PAGE_SIZE);
256 clear_page(addr);
257 __flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
258 __flush_icache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
259 }
260
261 void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
262 unsigned long user_vaddr,
263 void *dst, void *src, int len)
264 {
265 flush_cache_page(vma, user_vaddr, page_to_pfn(page));
266 memcpy(dst, src, len);
267 __flush_dcache((unsigned long)src, (unsigned long)src + len);
268 if (vma->vm_flags & VM_EXEC)
269 __flush_icache((unsigned long)src, (unsigned long)src + len);
270 }
271
272 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
273 unsigned long user_vaddr,
274 void *dst, void *src, int len)
275 {
276 flush_cache_page(vma, user_vaddr, page_to_pfn(page));
277 memcpy(dst, src, len);
278 __flush_dcache((unsigned long)dst, (unsigned long)dst + len);
279 if (vma->vm_flags & VM_EXEC)
280 __flush_icache((unsigned long)dst, (unsigned long)dst + len);
281 }
282
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