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) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
7 * Copyright (C) 2007 MIPS Technologies, Inc.
8 */
9 #include <linux/fs.h>
10 #include <linux/fcntl.h>
11 #include <linux/kernel.h>
12 #include <linux/linkage.h>
13 #include <linux/export.h>
14 #include <linux/sched.h>
15 #include <linux/syscalls.h>
16 #include <linux/mm.h>
17 #include <linux/highmem.h>
18 #include <linux/pagemap.h>
19
20 #include <asm/bcache.h>
21 #include <asm/cacheflush.h>
22 #include <asm/processor.h>
23 #include <asm/cpu.h>
24 #include <asm/cpu-features.h>
25 #include <asm/setup.h>
26 #include <asm/pgtable.h>
27
28 /* Cache operations. */
29 void (*flush_cache_all)(void);
30 void (*__flush_cache_all)(void);
31 EXPORT_SYMBOL_GPL(__flush_cache_all);
32 void (*flush_cache_mm)(struct mm_struct *mm);
33 void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
34 unsigned long end);
35 void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
36 unsigned long pfn);
37 void (*flush_icache_range)(unsigned long start, unsigned long end);
38 EXPORT_SYMBOL_GPL(flush_icache_range);
39 void (*local_flush_icache_range)(unsigned long start, unsigned long end);
40 EXPORT_SYMBOL_GPL(local_flush_icache_range);
41 void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
42 void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
43 EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);
44
45 void (*__flush_cache_vmap)(void);
46 void (*__flush_cache_vunmap)(void);
47
48 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
49 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
50
51 /* MIPS specific cache operations */
52 void (*flush_data_cache_page)(unsigned long addr);
53 void (*flush_icache_all)(void);
54
55 EXPORT_SYMBOL(flush_data_cache_page);
56 EXPORT_SYMBOL(flush_icache_all);
57
58 /*
59 * Dummy cache handling routine
60 */
61
62 void cache_noop(void) {}
63
64 #ifdef CONFIG_BOARD_SCACHE
65
66 static struct bcache_ops no_sc_ops = {
67 .bc_enable = (void *)cache_noop,
68 .bc_disable = (void *)cache_noop,
69 .bc_wback_inv = (void *)cache_noop,
70 .bc_inv = (void *)cache_noop
71 };
72
73 struct bcache_ops *bcops = &no_sc_ops;
74 #endif
75
76 #ifdef CONFIG_DMA_NONCOHERENT
77
78 /* DMA cache operations. */
79 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
80 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
81 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
82
83 #endif /* CONFIG_DMA_NONCOHERENT */
84
85 /*
86 * We could optimize the case where the cache argument is not BCACHE but
87 * that seems very atypical use ...
88 */
89 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
90 unsigned int, cache)
91 {
92 if (bytes == 0)
93 return 0;
94 if (!access_ok((void __user *) addr, bytes))
95 return -EFAULT;
96
97 __flush_icache_user_range(addr, addr + bytes);
98
99 return 0;
100 }
101
102 void __flush_dcache_pages(struct page *page, unsigned int nr)
103 {
104 struct folio *folio = page_folio(page);
105 struct address_space *mapping = folio_flush_mapping(folio);
106 unsigned long addr;
107 unsigned int i;
108
109 if (mapping && !mapping_mapped(mapping)) {
110 folio_set_dcache_dirty(folio);
111 return;
112 }
113
114 /*
115 * We could delay the flush for the !folio_mapping case too. But that
116 * case is for exec env/arg pages and those are %99 certainly going to
117 * get faulted into the tlb (and thus flushed) anyways.
118 */
119 for (i = 0; i < nr; i++) {
120 addr = (unsigned long)kmap_local_page(nth_page(page, i));
121 flush_data_cache_page(addr);
122 kunmap_local((void *)addr);
123 }
124 }
125 EXPORT_SYMBOL(__flush_dcache_pages);
126
127 void __flush_anon_page(struct page *page, unsigned long vmaddr)
128 {
129 unsigned long addr = (unsigned long) page_address(page);
130 struct folio *folio = page_folio(page);
131
132 if (pages_do_alias(addr, vmaddr)) {
133 if (folio_mapped(folio) && !folio_test_dcache_dirty(folio)) {
134 void *kaddr;
135
136 kaddr = kmap_coherent(page, vmaddr);
137 flush_data_cache_page((unsigned long)kaddr);
138 kunmap_coherent();
139 } else
140 flush_data_cache_page(addr);
141 }
142 }
143
144 EXPORT_SYMBOL(__flush_anon_page);
145
146 void __update_cache(unsigned long address, pte_t pte)
147 {
148 struct folio *folio;
149 unsigned long pfn, addr;
150 int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
151 unsigned int i;
152
153 pfn = pte_pfn(pte);
154 if (unlikely(!pfn_valid(pfn)))
155 return;
156
157 folio = page_folio(pfn_to_page(pfn));
158 address &= PAGE_MASK;
159 address -= offset_in_folio(folio, pfn << PAGE_SHIFT);
160
161 if (folio_test_dcache_dirty(folio)) {
162 for (i = 0; i < folio_nr_pages(folio); i++) {
163 addr = (unsigned long)kmap_local_folio(folio, i);
164
165 if (exec || pages_do_alias(addr, address))
166 flush_data_cache_page(addr);
167 kunmap_local((void *)addr);
168 address += PAGE_SIZE;
169 }
170 folio_clear_dcache_dirty(folio);
171 }
172 }
173
174 unsigned long _page_cachable_default;
175 EXPORT_SYMBOL(_page_cachable_default);
176
177 #define PM(p) __pgprot(_page_cachable_default | (p))
178
179 static pgprot_t protection_map[16] __ro_after_init;
180 DECLARE_VM_GET_PAGE_PROT
181
182 static inline void setup_protection_map(void)
183 {
184 protection_map[0] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
185 protection_map[1] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
186 protection_map[2] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
187 protection_map[3] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
188 protection_map[4] = PM(_PAGE_PRESENT);
189 protection_map[5] = PM(_PAGE_PRESENT);
190 protection_map[6] = PM(_PAGE_PRESENT);
191 protection_map[7] = PM(_PAGE_PRESENT);
192
193 protection_map[8] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
194 protection_map[9] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
195 protection_map[10] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE |
196 _PAGE_NO_READ);
197 protection_map[11] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
198 protection_map[12] = PM(_PAGE_PRESENT);
199 protection_map[13] = PM(_PAGE_PRESENT);
200 protection_map[14] = PM(_PAGE_PRESENT | _PAGE_WRITE);
201 protection_map[15] = PM(_PAGE_PRESENT | _PAGE_WRITE);
202 }
203
204 #undef PM
205
206 void cpu_cache_init(void)
207 {
208 if (IS_ENABLED(CONFIG_CPU_R3000) && cpu_has_3k_cache)
209 r3k_cache_init();
210 if (IS_ENABLED(CONFIG_CPU_R4K_CACHE_TLB) && cpu_has_4k_cache)
211 r4k_cache_init();
212
213 if (IS_ENABLED(CONFIG_CPU_CAVIUM_OCTEON) && cpu_has_octeon_cache)
214 octeon_cache_init();
215
216 setup_protection_map();
217 }
218
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