Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_HIGHMEM_H |
3 | #define _LINUX_HIGHMEM_H | |
4 | ||
1da177e4 | 5 | #include <linux/fs.h> |
597781f3 | 6 | #include <linux/kernel.h> |
187f1882 | 7 | #include <linux/bug.h> |
1da177e4 | 8 | #include <linux/mm.h> |
ad76fb6b | 9 | #include <linux/uaccess.h> |
43b3a0c7 | 10 | #include <linux/hardirq.h> |
1da177e4 LT |
11 | |
12 | #include <asm/cacheflush.h> | |
13 | ||
03beb076 | 14 | #ifndef ARCH_HAS_FLUSH_ANON_PAGE |
a6f36be3 | 15 | static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr) |
03beb076 JB |
16 | { |
17 | } | |
18 | #endif | |
19 | ||
5a3a5a98 JB |
20 | #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE |
21 | static inline void flush_kernel_dcache_page(struct page *page) | |
22 | { | |
23 | } | |
9df5f741 JB |
24 | static inline void flush_kernel_vmap_range(void *vaddr, int size) |
25 | { | |
26 | } | |
27 | static inline void invalidate_kernel_vmap_range(void *vaddr, int size) | |
28 | { | |
29 | } | |
5a3a5a98 JB |
30 | #endif |
31 | ||
3688e07f KG |
32 | #include <asm/kmap_types.h> |
33 | ||
3688e07f | 34 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
35 | #include <asm/highmem.h> |
36 | ||
37 | /* declarations for linux/mm/highmem.c */ | |
38 | unsigned int nr_free_highpages(void); | |
ca79b0c2 AK |
39 | extern atomic_long_t _totalhigh_pages; |
40 | static inline unsigned long totalhigh_pages(void) | |
41 | { | |
42 | return (unsigned long)atomic_long_read(&_totalhigh_pages); | |
43 | } | |
44 | ||
45 | static inline void totalhigh_pages_inc(void) | |
46 | { | |
47 | atomic_long_inc(&_totalhigh_pages); | |
48 | } | |
49 | ||
50 | static inline void totalhigh_pages_dec(void) | |
51 | { | |
52 | atomic_long_dec(&_totalhigh_pages); | |
53 | } | |
54 | ||
55 | static inline void totalhigh_pages_add(long count) | |
56 | { | |
57 | atomic_long_add(count, &_totalhigh_pages); | |
58 | } | |
59 | ||
60 | static inline void totalhigh_pages_set(long val) | |
61 | { | |
62 | atomic_long_set(&_totalhigh_pages, val); | |
63 | } | |
1da177e4 | 64 | |
ce6234b5 JF |
65 | void kmap_flush_unused(void); |
66 | ||
5a178119 MG |
67 | struct page *kmap_to_page(void *addr); |
68 | ||
1da177e4 LT |
69 | #else /* CONFIG_HIGHMEM */ |
70 | ||
71 | static inline unsigned int nr_free_highpages(void) { return 0; } | |
72 | ||
5a178119 MG |
73 | static inline struct page *kmap_to_page(void *addr) |
74 | { | |
75 | return virt_to_page(addr); | |
76 | } | |
77 | ||
ca79b0c2 | 78 | static inline unsigned long totalhigh_pages(void) { return 0UL; } |
c1f60a5a | 79 | |
a6ca1b99 | 80 | #ifndef ARCH_HAS_KMAP |
1da177e4 LT |
81 | static inline void *kmap(struct page *page) |
82 | { | |
83 | might_sleep(); | |
84 | return page_address(page); | |
85 | } | |
86 | ||
31c91132 MW |
87 | static inline void kunmap(struct page *page) |
88 | { | |
89 | } | |
1da177e4 | 90 | |
a24401bc | 91 | static inline void *kmap_atomic(struct page *page) |
254f9c5c | 92 | { |
2cb7c9cb | 93 | preempt_disable(); |
254f9c5c GU |
94 | pagefault_disable(); |
95 | return page_address(page); | |
96 | } | |
a24401bc | 97 | #define kmap_atomic_prot(page, prot) kmap_atomic(page) |
254f9c5c | 98 | |
3e4d3af5 | 99 | static inline void __kunmap_atomic(void *addr) |
4e60c86b AK |
100 | { |
101 | pagefault_enable(); | |
2cb7c9cb | 102 | preempt_enable(); |
4e60c86b AK |
103 | } |
104 | ||
3e4d3af5 | 105 | #define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) |
ce6234b5 JF |
106 | |
107 | #define kmap_flush_unused() do {} while(0) | |
a6ca1b99 | 108 | #endif |
1da177e4 LT |
109 | |
110 | #endif /* CONFIG_HIGHMEM */ | |
111 | ||
a8e23a29 PZ |
112 | #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) |
113 | ||
114 | DECLARE_PER_CPU(int, __kmap_atomic_idx); | |
115 | ||
116 | static inline int kmap_atomic_idx_push(void) | |
117 | { | |
cfb82434 CL |
118 | int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; |
119 | ||
a8e23a29 PZ |
120 | #ifdef CONFIG_DEBUG_HIGHMEM |
121 | WARN_ON_ONCE(in_irq() && !irqs_disabled()); | |
1d352bfd | 122 | BUG_ON(idx >= KM_TYPE_NR); |
a8e23a29 PZ |
123 | #endif |
124 | return idx; | |
125 | } | |
126 | ||
20273941 PZ |
127 | static inline int kmap_atomic_idx(void) |
128 | { | |
cfb82434 | 129 | return __this_cpu_read(__kmap_atomic_idx) - 1; |
20273941 PZ |
130 | } |
131 | ||
cfb82434 | 132 | static inline void kmap_atomic_idx_pop(void) |
a8e23a29 | 133 | { |
a8e23a29 | 134 | #ifdef CONFIG_DEBUG_HIGHMEM |
cfb82434 CL |
135 | int idx = __this_cpu_dec_return(__kmap_atomic_idx); |
136 | ||
a8e23a29 | 137 | BUG_ON(idx < 0); |
cfb82434 CL |
138 | #else |
139 | __this_cpu_dec(__kmap_atomic_idx); | |
a8e23a29 | 140 | #endif |
a8e23a29 PZ |
141 | } |
142 | ||
143 | #endif | |
144 | ||
3e4d3af5 PZ |
145 | /* |
146 | * Prevent people trying to call kunmap_atomic() as if it were kunmap() | |
147 | * kunmap_atomic() should get the return value of kmap_atomic, not the page. | |
148 | */ | |
1285e4c8 | 149 | #define kunmap_atomic(addr) \ |
980c19e3 CW |
150 | do { \ |
151 | BUILD_BUG_ON(__same_type((addr), struct page *)); \ | |
152 | __kunmap_atomic(addr); \ | |
153 | } while (0) | |
154 | ||
980c19e3 | 155 | |
1da177e4 | 156 | /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ |
487ff320 | 157 | #ifndef clear_user_highpage |
1da177e4 LT |
158 | static inline void clear_user_highpage(struct page *page, unsigned long vaddr) |
159 | { | |
1ec9c5dd | 160 | void *addr = kmap_atomic(page); |
1da177e4 | 161 | clear_user_page(addr, vaddr, page); |
1ec9c5dd | 162 | kunmap_atomic(addr); |
1da177e4 | 163 | } |
487ff320 | 164 | #endif |
1da177e4 LT |
165 | |
166 | #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE | |
769848c0 MG |
167 | /** |
168 | * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags | |
169 | * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE | |
170 | * @vma: The VMA the page is to be allocated for | |
171 | * @vaddr: The virtual address the page will be inserted into | |
172 | * | |
173 | * This function will allocate a page for a VMA but the caller is expected | |
174 | * to specify via movableflags whether the page will be movable in the | |
175 | * future or not | |
176 | * | |
177 | * An architecture may override this function by defining | |
178 | * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own | |
179 | * implementation. | |
180 | */ | |
1da177e4 | 181 | static inline struct page * |
769848c0 MG |
182 | __alloc_zeroed_user_highpage(gfp_t movableflags, |
183 | struct vm_area_struct *vma, | |
184 | unsigned long vaddr) | |
1da177e4 | 185 | { |
769848c0 MG |
186 | struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags, |
187 | vma, vaddr); | |
1da177e4 LT |
188 | |
189 | if (page) | |
190 | clear_user_highpage(page, vaddr); | |
191 | ||
192 | return page; | |
193 | } | |
194 | #endif | |
195 | ||
769848c0 MG |
196 | /** |
197 | * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move | |
198 | * @vma: The VMA the page is to be allocated for | |
199 | * @vaddr: The virtual address the page will be inserted into | |
200 | * | |
201 | * This function will allocate a page for a VMA that the caller knows will | |
202 | * be able to migrate in the future using move_pages() or reclaimed | |
203 | */ | |
204 | static inline struct page * | |
205 | alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma, | |
206 | unsigned long vaddr) | |
207 | { | |
208 | return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr); | |
209 | } | |
210 | ||
1da177e4 LT |
211 | static inline void clear_highpage(struct page *page) |
212 | { | |
1ec9c5dd | 213 | void *kaddr = kmap_atomic(page); |
1da177e4 | 214 | clear_page(kaddr); |
1ec9c5dd | 215 | kunmap_atomic(kaddr); |
1da177e4 LT |
216 | } |
217 | ||
eebd2aa3 CL |
218 | static inline void zero_user_segments(struct page *page, |
219 | unsigned start1, unsigned end1, | |
220 | unsigned start2, unsigned end2) | |
221 | { | |
1ec9c5dd | 222 | void *kaddr = kmap_atomic(page); |
eebd2aa3 CL |
223 | |
224 | BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE); | |
225 | ||
226 | if (end1 > start1) | |
227 | memset(kaddr + start1, 0, end1 - start1); | |
228 | ||
229 | if (end2 > start2) | |
230 | memset(kaddr + start2, 0, end2 - start2); | |
231 | ||
1ec9c5dd | 232 | kunmap_atomic(kaddr); |
eebd2aa3 CL |
233 | flush_dcache_page(page); |
234 | } | |
235 | ||
236 | static inline void zero_user_segment(struct page *page, | |
237 | unsigned start, unsigned end) | |
238 | { | |
239 | zero_user_segments(page, start, end, 0, 0); | |
240 | } | |
241 | ||
242 | static inline void zero_user(struct page *page, | |
243 | unsigned start, unsigned size) | |
244 | { | |
245 | zero_user_segments(page, start, start + size, 0, 0); | |
246 | } | |
01f2705d | 247 | |
77fff4ae AN |
248 | #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE |
249 | ||
9de455b2 AN |
250 | static inline void copy_user_highpage(struct page *to, struct page *from, |
251 | unsigned long vaddr, struct vm_area_struct *vma) | |
1da177e4 LT |
252 | { |
253 | char *vfrom, *vto; | |
254 | ||
1ec9c5dd CW |
255 | vfrom = kmap_atomic(from); |
256 | vto = kmap_atomic(to); | |
1da177e4 | 257 | copy_user_page(vto, vfrom, vaddr, to); |
1ec9c5dd CW |
258 | kunmap_atomic(vto); |
259 | kunmap_atomic(vfrom); | |
1da177e4 LT |
260 | } |
261 | ||
77fff4ae AN |
262 | #endif |
263 | ||
a4602b62 KA |
264 | #ifndef __HAVE_ARCH_COPY_HIGHPAGE |
265 | ||
1da177e4 LT |
266 | static inline void copy_highpage(struct page *to, struct page *from) |
267 | { | |
268 | char *vfrom, *vto; | |
269 | ||
1ec9c5dd CW |
270 | vfrom = kmap_atomic(from); |
271 | vto = kmap_atomic(to); | |
1da177e4 | 272 | copy_page(vto, vfrom); |
1ec9c5dd CW |
273 | kunmap_atomic(vto); |
274 | kunmap_atomic(vfrom); | |
1da177e4 LT |
275 | } |
276 | ||
a4602b62 KA |
277 | #endif |
278 | ||
1da177e4 | 279 | #endif /* _LINUX_HIGHMEM_H */ |