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1da177e4 LT |
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 | */ | |
0f8053a5 NP |
11 | #ifndef __MM_INTERNAL_H |
12 | #define __MM_INTERNAL_H | |
13 | ||
29f175d1 | 14 | #include <linux/fs.h> |
0f8053a5 | 15 | #include <linux/mm.h> |
1da177e4 | 16 | |
dd56b046 MG |
17 | /* |
18 | * The set of flags that only affect watermark checking and reclaim | |
19 | * behaviour. This is used by the MM to obey the caller constraints | |
20 | * about IO, FS and watermark checking while ignoring placement | |
21 | * hints such as HIGHMEM usage. | |
22 | */ | |
23 | #define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
24 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ | |
25 | __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC) | |
26 | ||
27 | /* The GFP flags allowed during early boot */ | |
28 | #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS)) | |
29 | ||
30 | /* Control allocation cpuset and node placement constraints */ | |
31 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
32 | ||
33 | /* Do not use these with a slab allocator */ | |
34 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
35 | ||
42b77728 JB |
36 | void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
37 | unsigned long floor, unsigned long ceiling); | |
38 | ||
7835e98b | 39 | static inline void set_page_count(struct page *page, int v) |
77a8a788 | 40 | { |
7835e98b NP |
41 | atomic_set(&page->_count, v); |
42 | } | |
43 | ||
29f175d1 FF |
44 | extern int __do_page_cache_readahead(struct address_space *mapping, |
45 | struct file *filp, pgoff_t offset, unsigned long nr_to_read, | |
46 | unsigned long lookahead_size); | |
47 | ||
48 | /* | |
49 | * Submit IO for the read-ahead request in file_ra_state. | |
50 | */ | |
51 | static inline unsigned long ra_submit(struct file_ra_state *ra, | |
52 | struct address_space *mapping, struct file *filp) | |
53 | { | |
54 | return __do_page_cache_readahead(mapping, filp, | |
55 | ra->start, ra->size, ra->async_size); | |
56 | } | |
57 | ||
7835e98b NP |
58 | /* |
59 | * Turn a non-refcounted page (->_count == 0) into refcounted with | |
60 | * a count of one. | |
61 | */ | |
62 | static inline void set_page_refcounted(struct page *page) | |
63 | { | |
309381fe SL |
64 | VM_BUG_ON_PAGE(PageTail(page), page); |
65 | VM_BUG_ON_PAGE(atomic_read(&page->_count), page); | |
77a8a788 | 66 | set_page_count(page, 1); |
77a8a788 NP |
67 | } |
68 | ||
70b50f94 AA |
69 | static inline void __get_page_tail_foll(struct page *page, |
70 | bool get_page_head) | |
71 | { | |
72 | /* | |
73 | * If we're getting a tail page, the elevated page->_count is | |
74 | * required only in the head page and we will elevate the head | |
75 | * page->_count and tail page->_mapcount. | |
76 | * | |
77 | * We elevate page_tail->_mapcount for tail pages to force | |
78 | * page_tail->_count to be zero at all times to avoid getting | |
79 | * false positives from get_page_unless_zero() with | |
80 | * speculative page access (like in | |
81 | * page_cache_get_speculative()) on tail pages. | |
82 | */ | |
1d798ca3 | 83 | VM_BUG_ON_PAGE(atomic_read(&compound_head(page)->_count) <= 0, page); |
70b50f94 | 84 | if (get_page_head) |
1d798ca3 | 85 | atomic_inc(&compound_head(page)->_count); |
c728852f | 86 | get_huge_page_tail(page); |
70b50f94 AA |
87 | } |
88 | ||
89 | /* | |
90 | * This is meant to be called as the FOLL_GET operation of | |
91 | * follow_page() and it must be called while holding the proper PT | |
92 | * lock while the pte (or pmd_trans_huge) is still mapping the page. | |
93 | */ | |
94 | static inline void get_page_foll(struct page *page) | |
95 | { | |
96 | if (unlikely(PageTail(page))) | |
97 | /* | |
98 | * This is safe only because | |
99 | * __split_huge_page_refcount() can't run under | |
100 | * get_page_foll() because we hold the proper PT lock. | |
101 | */ | |
102 | __get_page_tail_foll(page, true); | |
103 | else { | |
104 | /* | |
105 | * Getting a normal page or the head of a compound page | |
106 | * requires to already have an elevated page->_count. | |
107 | */ | |
309381fe | 108 | VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page); |
70b50f94 AA |
109 | atomic_inc(&page->_count); |
110 | } | |
111 | } | |
112 | ||
03f6462a HD |
113 | extern unsigned long highest_memmap_pfn; |
114 | ||
894bc310 LS |
115 | /* |
116 | * in mm/vmscan.c: | |
117 | */ | |
62695a84 | 118 | extern int isolate_lru_page(struct page *page); |
894bc310 | 119 | extern void putback_lru_page(struct page *page); |
6e543d57 | 120 | extern bool zone_reclaimable(struct zone *zone); |
62695a84 | 121 | |
6219049a BL |
122 | /* |
123 | * in mm/rmap.c: | |
124 | */ | |
125 | extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); | |
126 | ||
894bc310 LS |
127 | /* |
128 | * in mm/page_alloc.c | |
129 | */ | |
3c605096 | 130 | |
1a6d53a1 VB |
131 | /* |
132 | * Structure for holding the mostly immutable allocation parameters passed | |
133 | * between functions involved in allocations, including the alloc_pages* | |
134 | * family of functions. | |
135 | * | |
136 | * nodemask, migratetype and high_zoneidx are initialized only once in | |
137 | * __alloc_pages_nodemask() and then never change. | |
138 | * | |
139 | * zonelist, preferred_zone and classzone_idx are set first in | |
140 | * __alloc_pages_nodemask() for the fast path, and might be later changed | |
141 | * in __alloc_pages_slowpath(). All other functions pass the whole strucure | |
142 | * by a const pointer. | |
143 | */ | |
144 | struct alloc_context { | |
145 | struct zonelist *zonelist; | |
146 | nodemask_t *nodemask; | |
147 | struct zone *preferred_zone; | |
148 | int classzone_idx; | |
149 | int migratetype; | |
150 | enum zone_type high_zoneidx; | |
c9ab0c4f | 151 | bool spread_dirty_pages; |
1a6d53a1 VB |
152 | }; |
153 | ||
3c605096 JK |
154 | /* |
155 | * Locate the struct page for both the matching buddy in our | |
156 | * pair (buddy1) and the combined O(n+1) page they form (page). | |
157 | * | |
158 | * 1) Any buddy B1 will have an order O twin B2 which satisfies | |
159 | * the following equation: | |
160 | * B2 = B1 ^ (1 << O) | |
161 | * For example, if the starting buddy (buddy2) is #8 its order | |
162 | * 1 buddy is #10: | |
163 | * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10 | |
164 | * | |
165 | * 2) Any buddy B will have an order O+1 parent P which | |
166 | * satisfies the following equation: | |
167 | * P = B & ~(1 << O) | |
168 | * | |
169 | * Assumption: *_mem_map is contiguous at least up to MAX_ORDER | |
170 | */ | |
171 | static inline unsigned long | |
172 | __find_buddy_index(unsigned long page_idx, unsigned int order) | |
173 | { | |
174 | return page_idx ^ (1 << order); | |
175 | } | |
176 | ||
177 | extern int __isolate_free_page(struct page *page, unsigned int order); | |
d70ddd7a MG |
178 | extern void __free_pages_bootmem(struct page *page, unsigned long pfn, |
179 | unsigned int order); | |
d00181b9 | 180 | extern void prep_compound_page(struct page *page, unsigned int order); |
8d22ba1b WF |
181 | #ifdef CONFIG_MEMORY_FAILURE |
182 | extern bool is_free_buddy_page(struct page *page); | |
183 | #endif | |
42aa83cb | 184 | extern int user_min_free_kbytes; |
20a0307c | 185 | |
ff9543fd MN |
186 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA |
187 | ||
188 | /* | |
189 | * in mm/compaction.c | |
190 | */ | |
191 | /* | |
192 | * compact_control is used to track pages being migrated and the free pages | |
193 | * they are being migrated to during memory compaction. The free_pfn starts | |
194 | * at the end of a zone and migrate_pfn begins at the start. Movable pages | |
195 | * are moved to the end of a zone during a compaction run and the run | |
196 | * completes when free_pfn <= migrate_pfn | |
197 | */ | |
198 | struct compact_control { | |
199 | struct list_head freepages; /* List of free pages to migrate to */ | |
200 | struct list_head migratepages; /* List of pages being migrated */ | |
201 | unsigned long nr_freepages; /* Number of isolated free pages */ | |
202 | unsigned long nr_migratepages; /* Number of pages to migrate */ | |
203 | unsigned long free_pfn; /* isolate_freepages search base */ | |
204 | unsigned long migrate_pfn; /* isolate_migratepages search base */ | |
1a16718c | 205 | unsigned long last_migrated_pfn;/* Not yet flushed page being freed */ |
e0b9daeb | 206 | enum migrate_mode mode; /* Async or sync migration mode */ |
bb13ffeb | 207 | bool ignore_skip_hint; /* Scan blocks even if marked skip */ |
ff9543fd | 208 | int order; /* order a direct compactor needs */ |
6d7ce559 | 209 | const gfp_t gfp_mask; /* gfp mask of a direct compactor */ |
ebff3980 VB |
210 | const int alloc_flags; /* alloc flags of a direct compactor */ |
211 | const int classzone_idx; /* zone index of a direct compactor */ | |
ff9543fd | 212 | struct zone *zone; |
1f9efdef VB |
213 | int contended; /* Signal need_sched() or lock |
214 | * contention detected during | |
be976572 VB |
215 | * compaction |
216 | */ | |
ff9543fd MN |
217 | }; |
218 | ||
219 | unsigned long | |
bb13ffeb MG |
220 | isolate_freepages_range(struct compact_control *cc, |
221 | unsigned long start_pfn, unsigned long end_pfn); | |
ff9543fd | 222 | unsigned long |
edc2ca61 VB |
223 | isolate_migratepages_range(struct compact_control *cc, |
224 | unsigned long low_pfn, unsigned long end_pfn); | |
2149cdae JK |
225 | int find_suitable_fallback(struct free_area *area, unsigned int order, |
226 | int migratetype, bool only_stealable, bool *can_steal); | |
ff9543fd MN |
227 | |
228 | #endif | |
0f8053a5 | 229 | |
48f13bf3 | 230 | /* |
6c14466c MG |
231 | * This function returns the order of a free page in the buddy system. In |
232 | * general, page_zone(page)->lock must be held by the caller to prevent the | |
233 | * page from being allocated in parallel and returning garbage as the order. | |
234 | * If a caller does not hold page_zone(page)->lock, it must guarantee that the | |
99c0fd5e VB |
235 | * page cannot be allocated or merged in parallel. Alternatively, it must |
236 | * handle invalid values gracefully, and use page_order_unsafe() below. | |
48f13bf3 | 237 | */ |
d00181b9 | 238 | static inline unsigned int page_order(struct page *page) |
48f13bf3 | 239 | { |
572438f9 | 240 | /* PageBuddy() must be checked by the caller */ |
48f13bf3 MG |
241 | return page_private(page); |
242 | } | |
b5a0e011 | 243 | |
99c0fd5e VB |
244 | /* |
245 | * Like page_order(), but for callers who cannot afford to hold the zone lock. | |
246 | * PageBuddy() should be checked first by the caller to minimize race window, | |
247 | * and invalid values must be handled gracefully. | |
248 | * | |
4db0c3c2 | 249 | * READ_ONCE is used so that if the caller assigns the result into a local |
99c0fd5e VB |
250 | * variable and e.g. tests it for valid range before using, the compiler cannot |
251 | * decide to remove the variable and inline the page_private(page) multiple | |
252 | * times, potentially observing different values in the tests and the actual | |
253 | * use of the result. | |
254 | */ | |
4db0c3c2 | 255 | #define page_order_unsafe(page) READ_ONCE(page_private(page)) |
99c0fd5e | 256 | |
4bbd4c77 KS |
257 | static inline bool is_cow_mapping(vm_flags_t flags) |
258 | { | |
259 | return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; | |
260 | } | |
261 | ||
6038def0 NK |
262 | /* mm/util.c */ |
263 | void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, | |
264 | struct vm_area_struct *prev, struct rb_node *rb_parent); | |
265 | ||
af8e3354 | 266 | #ifdef CONFIG_MMU |
fc05f566 | 267 | extern long populate_vma_page_range(struct vm_area_struct *vma, |
cea10a19 | 268 | unsigned long start, unsigned long end, int *nonblocking); |
af8e3354 HD |
269 | extern void munlock_vma_pages_range(struct vm_area_struct *vma, |
270 | unsigned long start, unsigned long end); | |
271 | static inline void munlock_vma_pages_all(struct vm_area_struct *vma) | |
272 | { | |
273 | munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); | |
274 | } | |
275 | ||
b291f000 | 276 | /* |
73848b46 | 277 | * must be called with vma's mmap_sem held for read or write, and page locked. |
b291f000 NP |
278 | */ |
279 | extern void mlock_vma_page(struct page *page); | |
ff6a6da6 | 280 | extern unsigned int munlock_vma_page(struct page *page); |
b291f000 NP |
281 | |
282 | /* | |
283 | * Clear the page's PageMlocked(). This can be useful in a situation where | |
284 | * we want to unconditionally remove a page from the pagecache -- e.g., | |
285 | * on truncation or freeing. | |
286 | * | |
287 | * It is legal to call this function for any page, mlocked or not. | |
288 | * If called for a page that is still mapped by mlocked vmas, all we do | |
289 | * is revert to lazy LRU behaviour -- semantics are not broken. | |
290 | */ | |
e6c509f8 | 291 | extern void clear_page_mlock(struct page *page); |
b291f000 NP |
292 | |
293 | /* | |
51afb12b HD |
294 | * mlock_migrate_page - called only from migrate_misplaced_transhuge_page() |
295 | * (because that does not go through the full procedure of migration ptes): | |
296 | * to migrate the Mlocked page flag; update statistics. | |
b291f000 NP |
297 | */ |
298 | static inline void mlock_migrate_page(struct page *newpage, struct page *page) | |
299 | { | |
5344b7e6 | 300 | if (TestClearPageMlocked(page)) { |
b32967ff | 301 | int nr_pages = hpage_nr_pages(page); |
5344b7e6 | 302 | |
51afb12b | 303 | /* Holding pmd lock, no change in irq context: __mod is safe */ |
b32967ff | 304 | __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages); |
b291f000 | 305 | SetPageMlocked(newpage); |
b32967ff | 306 | __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages); |
5344b7e6 | 307 | } |
b291f000 NP |
308 | } |
309 | ||
b32967ff MG |
310 | extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); |
311 | ||
71e3aac0 AA |
312 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
313 | extern unsigned long vma_address(struct page *page, | |
314 | struct vm_area_struct *vma); | |
315 | #endif | |
af8e3354 | 316 | #else /* !CONFIG_MMU */ |
b291f000 NP |
317 | static inline void clear_page_mlock(struct page *page) { } |
318 | static inline void mlock_vma_page(struct page *page) { } | |
319 | static inline void mlock_migrate_page(struct page *new, struct page *old) { } | |
320 | ||
af8e3354 | 321 | #endif /* !CONFIG_MMU */ |
894bc310 | 322 | |
69d177c2 AW |
323 | /* |
324 | * Return the mem_map entry representing the 'offset' subpage within | |
325 | * the maximally aligned gigantic page 'base'. Handle any discontiguity | |
326 | * in the mem_map at MAX_ORDER_NR_PAGES boundaries. | |
327 | */ | |
328 | static inline struct page *mem_map_offset(struct page *base, int offset) | |
329 | { | |
330 | if (unlikely(offset >= MAX_ORDER_NR_PAGES)) | |
bc7f84c0 | 331 | return nth_page(base, offset); |
69d177c2 AW |
332 | return base + offset; |
333 | } | |
334 | ||
335 | /* | |
25985edc | 336 | * Iterator over all subpages within the maximally aligned gigantic |
69d177c2 AW |
337 | * page 'base'. Handle any discontiguity in the mem_map. |
338 | */ | |
339 | static inline struct page *mem_map_next(struct page *iter, | |
340 | struct page *base, int offset) | |
341 | { | |
342 | if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { | |
343 | unsigned long pfn = page_to_pfn(base) + offset; | |
344 | if (!pfn_valid(pfn)) | |
345 | return NULL; | |
346 | return pfn_to_page(pfn); | |
347 | } | |
348 | return iter + 1; | |
349 | } | |
350 | ||
b5a0e011 AH |
351 | /* |
352 | * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, | |
353 | * so all functions starting at paging_init should be marked __init | |
354 | * in those cases. SPARSEMEM, however, allows for memory hotplug, | |
355 | * and alloc_bootmem_node is not used. | |
356 | */ | |
357 | #ifdef CONFIG_SPARSEMEM | |
358 | #define __paginginit __meminit | |
359 | #else | |
360 | #define __paginginit __init | |
361 | #endif | |
362 | ||
6b74ab97 MG |
363 | /* Memory initialisation debug and verification */ |
364 | enum mminit_level { | |
365 | MMINIT_WARNING, | |
366 | MMINIT_VERIFY, | |
367 | MMINIT_TRACE | |
368 | }; | |
369 | ||
370 | #ifdef CONFIG_DEBUG_MEMORY_INIT | |
371 | ||
372 | extern int mminit_loglevel; | |
373 | ||
374 | #define mminit_dprintk(level, prefix, fmt, arg...) \ | |
375 | do { \ | |
376 | if (level < mminit_loglevel) { \ | |
fc5199d1 RV |
377 | if (level <= MMINIT_WARNING) \ |
378 | printk(KERN_WARNING "mminit::" prefix " " fmt, ##arg); \ | |
379 | else \ | |
380 | printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \ | |
6b74ab97 MG |
381 | } \ |
382 | } while (0) | |
383 | ||
708614e6 | 384 | extern void mminit_verify_pageflags_layout(void); |
68ad8df4 | 385 | extern void mminit_verify_zonelist(void); |
6b74ab97 MG |
386 | #else |
387 | ||
388 | static inline void mminit_dprintk(enum mminit_level level, | |
389 | const char *prefix, const char *fmt, ...) | |
390 | { | |
391 | } | |
392 | ||
708614e6 MG |
393 | static inline void mminit_verify_pageflags_layout(void) |
394 | { | |
395 | } | |
396 | ||
68ad8df4 MG |
397 | static inline void mminit_verify_zonelist(void) |
398 | { | |
399 | } | |
6b74ab97 | 400 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
2dbb51c4 MG |
401 | |
402 | /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ | |
403 | #if defined(CONFIG_SPARSEMEM) | |
404 | extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
405 | unsigned long *end_pfn); | |
406 | #else | |
407 | static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
408 | unsigned long *end_pfn) | |
409 | { | |
410 | } | |
411 | #endif /* CONFIG_SPARSEMEM */ | |
412 | ||
fa5e084e MG |
413 | #define ZONE_RECLAIM_NOSCAN -2 |
414 | #define ZONE_RECLAIM_FULL -1 | |
415 | #define ZONE_RECLAIM_SOME 0 | |
416 | #define ZONE_RECLAIM_SUCCESS 1 | |
7c116f2b | 417 | |
31d3d348 WF |
418 | extern int hwpoison_filter(struct page *p); |
419 | ||
7c116f2b WF |
420 | extern u32 hwpoison_filter_dev_major; |
421 | extern u32 hwpoison_filter_dev_minor; | |
478c5ffc WF |
422 | extern u64 hwpoison_filter_flags_mask; |
423 | extern u64 hwpoison_filter_flags_value; | |
4fd466eb | 424 | extern u64 hwpoison_filter_memcg; |
1bfe5feb | 425 | extern u32 hwpoison_filter_enable; |
eb36c587 AV |
426 | |
427 | extern unsigned long vm_mmap_pgoff(struct file *, unsigned long, | |
428 | unsigned long, unsigned long, | |
429 | unsigned long, unsigned long); | |
ca57df79 XQ |
430 | |
431 | extern void set_pageblock_order(void); | |
02c6de8d MK |
432 | unsigned long reclaim_clean_pages_from_list(struct zone *zone, |
433 | struct list_head *page_list); | |
d95ea5d1 BZ |
434 | /* The ALLOC_WMARK bits are used as an index to zone->watermark */ |
435 | #define ALLOC_WMARK_MIN WMARK_MIN | |
436 | #define ALLOC_WMARK_LOW WMARK_LOW | |
437 | #define ALLOC_WMARK_HIGH WMARK_HIGH | |
438 | #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */ | |
439 | ||
440 | /* Mask to get the watermark bits */ | |
441 | #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1) | |
442 | ||
443 | #define ALLOC_HARDER 0x10 /* try to alloc harder */ | |
444 | #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ | |
445 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ | |
446 | #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */ | |
3a025760 | 447 | #define ALLOC_FAIR 0x100 /* fair zone allocation */ |
d95ea5d1 | 448 | |
72b252ae MG |
449 | enum ttu_flags; |
450 | struct tlbflush_unmap_batch; | |
451 | ||
452 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH | |
453 | void try_to_unmap_flush(void); | |
d950c947 | 454 | void try_to_unmap_flush_dirty(void); |
72b252ae MG |
455 | #else |
456 | static inline void try_to_unmap_flush(void) | |
457 | { | |
458 | } | |
d950c947 MG |
459 | static inline void try_to_unmap_flush_dirty(void) |
460 | { | |
461 | } | |
72b252ae MG |
462 | |
463 | #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */ | |
db971418 | 464 | #endif /* __MM_INTERNAL_H */ |