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1 | /* internal.h: mm/ internal definitions | |
2 | * | |
3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | #ifndef __MM_INTERNAL_H | |
12 | #define __MM_INTERNAL_H | |
13 | ||
14 | #include <linux/mm.h> | |
15 | ||
16 | void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, | |
17 | unsigned long floor, unsigned long ceiling); | |
18 | ||
19 | static inline void set_page_count(struct page *page, int v) | |
20 | { | |
21 | atomic_set(&page->_count, v); | |
22 | } | |
23 | ||
24 | /* | |
25 | * Turn a non-refcounted page (->_count == 0) into refcounted with | |
26 | * a count of one. | |
27 | */ | |
28 | static inline void set_page_refcounted(struct page *page) | |
29 | { | |
30 | VM_BUG_ON(PageTail(page)); | |
31 | VM_BUG_ON(atomic_read(&page->_count)); | |
32 | set_page_count(page, 1); | |
33 | } | |
34 | ||
35 | static inline void __get_page_tail_foll(struct page *page, | |
36 | bool get_page_head) | |
37 | { | |
38 | /* | |
39 | * If we're getting a tail page, the elevated page->_count is | |
40 | * required only in the head page and we will elevate the head | |
41 | * page->_count and tail page->_mapcount. | |
42 | * | |
43 | * We elevate page_tail->_mapcount for tail pages to force | |
44 | * page_tail->_count to be zero at all times to avoid getting | |
45 | * false positives from get_page_unless_zero() with | |
46 | * speculative page access (like in | |
47 | * page_cache_get_speculative()) on tail pages. | |
48 | */ | |
49 | VM_BUG_ON(atomic_read(&page->first_page->_count) <= 0); | |
50 | VM_BUG_ON(atomic_read(&page->_count) != 0); | |
51 | VM_BUG_ON(page_mapcount(page) < 0); | |
52 | if (get_page_head) | |
53 | atomic_inc(&page->first_page->_count); | |
54 | atomic_inc(&page->_mapcount); | |
55 | } | |
56 | ||
57 | /* | |
58 | * This is meant to be called as the FOLL_GET operation of | |
59 | * follow_page() and it must be called while holding the proper PT | |
60 | * lock while the pte (or pmd_trans_huge) is still mapping the page. | |
61 | */ | |
62 | static inline void get_page_foll(struct page *page) | |
63 | { | |
64 | if (unlikely(PageTail(page))) | |
65 | /* | |
66 | * This is safe only because | |
67 | * __split_huge_page_refcount() can't run under | |
68 | * get_page_foll() because we hold the proper PT lock. | |
69 | */ | |
70 | __get_page_tail_foll(page, true); | |
71 | else { | |
72 | /* | |
73 | * Getting a normal page or the head of a compound page | |
74 | * requires to already have an elevated page->_count. | |
75 | */ | |
76 | VM_BUG_ON(atomic_read(&page->_count) <= 0); | |
77 | atomic_inc(&page->_count); | |
78 | } | |
79 | } | |
80 | ||
81 | extern unsigned long highest_memmap_pfn; | |
82 | ||
83 | /* | |
84 | * in mm/vmscan.c: | |
85 | */ | |
86 | extern int isolate_lru_page(struct page *page); | |
87 | extern void putback_lru_page(struct page *page); | |
88 | ||
89 | /* | |
90 | * in mm/rmap.c: | |
91 | */ | |
92 | extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); | |
93 | ||
94 | /* | |
95 | * in mm/page_alloc.c | |
96 | */ | |
97 | extern void __free_pages_bootmem(struct page *page, unsigned int order); | |
98 | extern void prep_compound_page(struct page *page, unsigned long order); | |
99 | #ifdef CONFIG_MEMORY_FAILURE | |
100 | extern bool is_free_buddy_page(struct page *page); | |
101 | #endif | |
102 | ||
103 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA | |
104 | ||
105 | /* | |
106 | * in mm/compaction.c | |
107 | */ | |
108 | /* | |
109 | * compact_control is used to track pages being migrated and the free pages | |
110 | * they are being migrated to during memory compaction. The free_pfn starts | |
111 | * at the end of a zone and migrate_pfn begins at the start. Movable pages | |
112 | * are moved to the end of a zone during a compaction run and the run | |
113 | * completes when free_pfn <= migrate_pfn | |
114 | */ | |
115 | struct compact_control { | |
116 | struct list_head freepages; /* List of free pages to migrate to */ | |
117 | struct list_head migratepages; /* List of pages being migrated */ | |
118 | unsigned long nr_freepages; /* Number of isolated free pages */ | |
119 | unsigned long nr_migratepages; /* Number of pages to migrate */ | |
120 | unsigned long free_pfn; /* isolate_freepages search base */ | |
121 | unsigned long migrate_pfn; /* isolate_migratepages search base */ | |
122 | bool sync; /* Synchronous migration */ | |
123 | bool ignore_skip_hint; /* Scan blocks even if marked skip */ | |
124 | bool finished_update_free; /* True when the zone cached pfns are | |
125 | * no longer being updated | |
126 | */ | |
127 | bool finished_update_migrate; | |
128 | ||
129 | int order; /* order a direct compactor needs */ | |
130 | int migratetype; /* MOVABLE, RECLAIMABLE etc */ | |
131 | struct zone *zone; | |
132 | bool contended; /* True if a lock was contended */ | |
133 | }; | |
134 | ||
135 | unsigned long | |
136 | isolate_freepages_range(struct compact_control *cc, | |
137 | unsigned long start_pfn, unsigned long end_pfn); | |
138 | unsigned long | |
139 | isolate_migratepages_range(struct zone *zone, struct compact_control *cc, | |
140 | unsigned long low_pfn, unsigned long end_pfn, bool unevictable); | |
141 | ||
142 | #endif | |
143 | ||
144 | /* | |
145 | * function for dealing with page's order in buddy system. | |
146 | * zone->lock is already acquired when we use these. | |
147 | * So, we don't need atomic page->flags operations here. | |
148 | */ | |
149 | static inline unsigned long page_order(struct page *page) | |
150 | { | |
151 | /* PageBuddy() must be checked by the caller */ | |
152 | return page_private(page); | |
153 | } | |
154 | ||
155 | /* mm/util.c */ | |
156 | void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, | |
157 | struct vm_area_struct *prev, struct rb_node *rb_parent); | |
158 | ||
159 | #ifdef CONFIG_MMU | |
160 | extern long __mlock_vma_pages_range(struct vm_area_struct *vma, | |
161 | unsigned long start, unsigned long end, int *nonblocking); | |
162 | extern void munlock_vma_pages_range(struct vm_area_struct *vma, | |
163 | unsigned long start, unsigned long end); | |
164 | static inline void munlock_vma_pages_all(struct vm_area_struct *vma) | |
165 | { | |
166 | munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); | |
167 | } | |
168 | ||
169 | /* | |
170 | * Called only in fault path, to determine if a new page is being | |
171 | * mapped into a LOCKED vma. If it is, mark page as mlocked. | |
172 | */ | |
173 | static inline int mlocked_vma_newpage(struct vm_area_struct *vma, | |
174 | struct page *page) | |
175 | { | |
176 | VM_BUG_ON(PageLRU(page)); | |
177 | ||
178 | if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) | |
179 | return 0; | |
180 | ||
181 | if (!TestSetPageMlocked(page)) { | |
182 | mod_zone_page_state(page_zone(page), NR_MLOCK, | |
183 | hpage_nr_pages(page)); | |
184 | count_vm_event(UNEVICTABLE_PGMLOCKED); | |
185 | } | |
186 | return 1; | |
187 | } | |
188 | ||
189 | /* | |
190 | * must be called with vma's mmap_sem held for read or write, and page locked. | |
191 | */ | |
192 | extern void mlock_vma_page(struct page *page); | |
193 | extern unsigned int munlock_vma_page(struct page *page); | |
194 | ||
195 | /* | |
196 | * Clear the page's PageMlocked(). This can be useful in a situation where | |
197 | * we want to unconditionally remove a page from the pagecache -- e.g., | |
198 | * on truncation or freeing. | |
199 | * | |
200 | * It is legal to call this function for any page, mlocked or not. | |
201 | * If called for a page that is still mapped by mlocked vmas, all we do | |
202 | * is revert to lazy LRU behaviour -- semantics are not broken. | |
203 | */ | |
204 | extern void clear_page_mlock(struct page *page); | |
205 | ||
206 | /* | |
207 | * mlock_migrate_page - called only from migrate_page_copy() to | |
208 | * migrate the Mlocked page flag; update statistics. | |
209 | */ | |
210 | static inline void mlock_migrate_page(struct page *newpage, struct page *page) | |
211 | { | |
212 | if (TestClearPageMlocked(page)) { | |
213 | unsigned long flags; | |
214 | int nr_pages = hpage_nr_pages(page); | |
215 | ||
216 | local_irq_save(flags); | |
217 | __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages); | |
218 | SetPageMlocked(newpage); | |
219 | __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages); | |
220 | local_irq_restore(flags); | |
221 | } | |
222 | } | |
223 | ||
224 | extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); | |
225 | ||
226 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
227 | extern unsigned long vma_address(struct page *page, | |
228 | struct vm_area_struct *vma); | |
229 | #endif | |
230 | #else /* !CONFIG_MMU */ | |
231 | static inline int mlocked_vma_newpage(struct vm_area_struct *v, struct page *p) | |
232 | { | |
233 | return 0; | |
234 | } | |
235 | static inline void clear_page_mlock(struct page *page) { } | |
236 | static inline void mlock_vma_page(struct page *page) { } | |
237 | static inline void mlock_migrate_page(struct page *new, struct page *old) { } | |
238 | ||
239 | #endif /* !CONFIG_MMU */ | |
240 | ||
241 | /* | |
242 | * Return the mem_map entry representing the 'offset' subpage within | |
243 | * the maximally aligned gigantic page 'base'. Handle any discontiguity | |
244 | * in the mem_map at MAX_ORDER_NR_PAGES boundaries. | |
245 | */ | |
246 | static inline struct page *mem_map_offset(struct page *base, int offset) | |
247 | { | |
248 | if (unlikely(offset >= MAX_ORDER_NR_PAGES)) | |
249 | return pfn_to_page(page_to_pfn(base) + offset); | |
250 | return base + offset; | |
251 | } | |
252 | ||
253 | /* | |
254 | * Iterator over all subpages within the maximally aligned gigantic | |
255 | * page 'base'. Handle any discontiguity in the mem_map. | |
256 | */ | |
257 | static inline struct page *mem_map_next(struct page *iter, | |
258 | struct page *base, int offset) | |
259 | { | |
260 | if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { | |
261 | unsigned long pfn = page_to_pfn(base) + offset; | |
262 | if (!pfn_valid(pfn)) | |
263 | return NULL; | |
264 | return pfn_to_page(pfn); | |
265 | } | |
266 | return iter + 1; | |
267 | } | |
268 | ||
269 | /* | |
270 | * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, | |
271 | * so all functions starting at paging_init should be marked __init | |
272 | * in those cases. SPARSEMEM, however, allows for memory hotplug, | |
273 | * and alloc_bootmem_node is not used. | |
274 | */ | |
275 | #ifdef CONFIG_SPARSEMEM | |
276 | #define __paginginit __meminit | |
277 | #else | |
278 | #define __paginginit __init | |
279 | #endif | |
280 | ||
281 | /* Memory initialisation debug and verification */ | |
282 | enum mminit_level { | |
283 | MMINIT_WARNING, | |
284 | MMINIT_VERIFY, | |
285 | MMINIT_TRACE | |
286 | }; | |
287 | ||
288 | #ifdef CONFIG_DEBUG_MEMORY_INIT | |
289 | ||
290 | extern int mminit_loglevel; | |
291 | ||
292 | #define mminit_dprintk(level, prefix, fmt, arg...) \ | |
293 | do { \ | |
294 | if (level < mminit_loglevel) { \ | |
295 | printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ | |
296 | printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ | |
297 | } \ | |
298 | } while (0) | |
299 | ||
300 | extern void mminit_verify_pageflags_layout(void); | |
301 | extern void mminit_verify_page_links(struct page *page, | |
302 | enum zone_type zone, unsigned long nid, unsigned long pfn); | |
303 | extern void mminit_verify_zonelist(void); | |
304 | ||
305 | #else | |
306 | ||
307 | static inline void mminit_dprintk(enum mminit_level level, | |
308 | const char *prefix, const char *fmt, ...) | |
309 | { | |
310 | } | |
311 | ||
312 | static inline void mminit_verify_pageflags_layout(void) | |
313 | { | |
314 | } | |
315 | ||
316 | static inline void mminit_verify_page_links(struct page *page, | |
317 | enum zone_type zone, unsigned long nid, unsigned long pfn) | |
318 | { | |
319 | } | |
320 | ||
321 | static inline void mminit_verify_zonelist(void) | |
322 | { | |
323 | } | |
324 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ | |
325 | ||
326 | /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ | |
327 | #if defined(CONFIG_SPARSEMEM) | |
328 | extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
329 | unsigned long *end_pfn); | |
330 | #else | |
331 | static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
332 | unsigned long *end_pfn) | |
333 | { | |
334 | } | |
335 | #endif /* CONFIG_SPARSEMEM */ | |
336 | ||
337 | #define ZONE_RECLAIM_NOSCAN -2 | |
338 | #define ZONE_RECLAIM_FULL -1 | |
339 | #define ZONE_RECLAIM_SOME 0 | |
340 | #define ZONE_RECLAIM_SUCCESS 1 | |
341 | ||
342 | extern int hwpoison_filter(struct page *p); | |
343 | ||
344 | extern u32 hwpoison_filter_dev_major; | |
345 | extern u32 hwpoison_filter_dev_minor; | |
346 | extern u64 hwpoison_filter_flags_mask; | |
347 | extern u64 hwpoison_filter_flags_value; | |
348 | extern u64 hwpoison_filter_memcg; | |
349 | extern u32 hwpoison_filter_enable; | |
350 | ||
351 | extern unsigned long vm_mmap_pgoff(struct file *, unsigned long, | |
352 | unsigned long, unsigned long, | |
353 | unsigned long, unsigned long); | |
354 | ||
355 | extern void set_pageblock_order(void); | |
356 | unsigned long reclaim_clean_pages_from_list(struct zone *zone, | |
357 | struct list_head *page_list); | |
358 | /* The ALLOC_WMARK bits are used as an index to zone->watermark */ | |
359 | #define ALLOC_WMARK_MIN WMARK_MIN | |
360 | #define ALLOC_WMARK_LOW WMARK_LOW | |
361 | #define ALLOC_WMARK_HIGH WMARK_HIGH | |
362 | #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */ | |
363 | ||
364 | /* Mask to get the watermark bits */ | |
365 | #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1) | |
366 | ||
367 | #define ALLOC_HARDER 0x10 /* try to alloc harder */ | |
368 | #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ | |
369 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ | |
370 | #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */ | |
371 | ||
372 | #endif /* __MM_INTERNAL_H */ |