Commit | Line | Data |
---|---|---|
2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* internal.h: mm/ internal definitions |
3 | * | |
4 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
1da177e4 | 6 | */ |
0f8053a5 NP |
7 | #ifndef __MM_INTERNAL_H |
8 | #define __MM_INTERNAL_H | |
9 | ||
29f175d1 | 10 | #include <linux/fs.h> |
0f8053a5 | 11 | #include <linux/mm.h> |
e9b61f19 | 12 | #include <linux/pagemap.h> |
2aff7a47 | 13 | #include <linux/rmap.h> |
edf14cdb | 14 | #include <linux/tracepoint-defs.h> |
1da177e4 | 15 | |
0e499ed3 MWO |
16 | struct folio_batch; |
17 | ||
dd56b046 MG |
18 | /* |
19 | * The set of flags that only affect watermark checking and reclaim | |
20 | * behaviour. This is used by the MM to obey the caller constraints | |
21 | * about IO, FS and watermark checking while ignoring placement | |
22 | * hints such as HIGHMEM usage. | |
23 | */ | |
24 | #define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
dcda9b04 | 25 | __GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NOFAIL|\ |
e838a45f | 26 | __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC|\ |
2973d822 | 27 | __GFP_NOLOCKDEP) |
dd56b046 MG |
28 | |
29 | /* The GFP flags allowed during early boot */ | |
30 | #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS)) | |
31 | ||
32 | /* Control allocation cpuset and node placement constraints */ | |
33 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
34 | ||
35 | /* Do not use these with a slab allocator */ | |
36 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
37 | ||
3f913fc5 QZ |
38 | /* |
39 | * Different from WARN_ON_ONCE(), no warning will be issued | |
40 | * when we specify __GFP_NOWARN. | |
41 | */ | |
42 | #define WARN_ON_ONCE_GFP(cond, gfp) ({ \ | |
43 | static bool __section(".data.once") __warned; \ | |
44 | int __ret_warn_once = !!(cond); \ | |
45 | \ | |
46 | if (unlikely(!(gfp & __GFP_NOWARN) && __ret_warn_once && !__warned)) { \ | |
47 | __warned = true; \ | |
48 | WARN_ON(1); \ | |
49 | } \ | |
50 | unlikely(__ret_warn_once); \ | |
51 | }) | |
52 | ||
62906027 NP |
53 | void page_writeback_init(void); |
54 | ||
eec20426 MWO |
55 | /* |
56 | * If a 16GB hugetlb folio were mapped by PTEs of all of its 4kB pages, | |
57 | * its nr_pages_mapped would be 0x400000: choose the COMPOUND_MAPPED bit | |
58 | * above that range, instead of 2*(PMD_SIZE/PAGE_SIZE). Hugetlb currently | |
59 | * leaves nr_pages_mapped at 0, but avoid surprise if it participates later. | |
60 | */ | |
61 | #define COMPOUND_MAPPED 0x800000 | |
62 | #define FOLIO_PAGES_MAPPED (COMPOUND_MAPPED - 1) | |
63 | ||
1279aa06 KW |
64 | /* |
65 | * Flags passed to __show_mem() and show_free_areas() to suppress output in | |
66 | * various contexts. | |
67 | */ | |
68 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ | |
69 | ||
eec20426 MWO |
70 | /* |
71 | * How many individual pages have an elevated _mapcount. Excludes | |
72 | * the folio's entire_mapcount. | |
73 | */ | |
74 | static inline int folio_nr_pages_mapped(struct folio *folio) | |
75 | { | |
76 | return atomic_read(&folio->_nr_pages_mapped) & FOLIO_PAGES_MAPPED; | |
77 | } | |
78 | ||
64601000 MWO |
79 | static inline void *folio_raw_mapping(struct folio *folio) |
80 | { | |
81 | unsigned long mapping = (unsigned long)folio->mapping; | |
82 | ||
83 | return (void *)(mapping & ~PAGE_MAPPING_FLAGS); | |
84 | } | |
85 | ||
512b7931 | 86 | void __acct_reclaim_writeback(pg_data_t *pgdat, struct folio *folio, |
8cd7c588 | 87 | int nr_throttled); |
512b7931 | 88 | static inline void acct_reclaim_writeback(struct folio *folio) |
8cd7c588 | 89 | { |
512b7931 | 90 | pg_data_t *pgdat = folio_pgdat(folio); |
8cd7c588 MG |
91 | int nr_throttled = atomic_read(&pgdat->nr_writeback_throttled); |
92 | ||
93 | if (nr_throttled) | |
512b7931 | 94 | __acct_reclaim_writeback(pgdat, folio, nr_throttled); |
8cd7c588 MG |
95 | } |
96 | ||
d818fca1 MG |
97 | static inline void wake_throttle_isolated(pg_data_t *pgdat) |
98 | { | |
99 | wait_queue_head_t *wqh; | |
100 | ||
101 | wqh = &pgdat->reclaim_wait[VMSCAN_THROTTLE_ISOLATED]; | |
102 | if (waitqueue_active(wqh)) | |
103 | wake_up(wqh); | |
104 | } | |
105 | ||
2b740303 | 106 | vm_fault_t do_swap_page(struct vm_fault *vmf); |
575ced1c | 107 | void folio_rotate_reclaimable(struct folio *folio); |
269ccca3 | 108 | bool __folio_end_writeback(struct folio *folio); |
261b6840 | 109 | void deactivate_file_folio(struct folio *folio); |
018ee47f | 110 | void folio_activate(struct folio *folio); |
8a966ed7 | 111 | |
fd892593 | 112 | void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas, |
763ecb03 | 113 | struct vm_area_struct *start_vma, unsigned long floor, |
98e51a22 | 114 | unsigned long ceiling, bool mm_wr_locked); |
03c4f204 | 115 | void pmd_install(struct mm_struct *mm, pmd_t *pmd, pgtable_t *pte); |
42b77728 | 116 | |
3506659e | 117 | struct zap_details; |
aac45363 MH |
118 | void unmap_page_range(struct mmu_gather *tlb, |
119 | struct vm_area_struct *vma, | |
120 | unsigned long addr, unsigned long end, | |
121 | struct zap_details *details); | |
122 | ||
56a4d67c MWO |
123 | void page_cache_ra_order(struct readahead_control *, struct file_ra_state *, |
124 | unsigned int order); | |
fcd9ae4f | 125 | void force_page_cache_ra(struct readahead_control *, unsigned long nr); |
7b3df3b9 DH |
126 | static inline void force_page_cache_readahead(struct address_space *mapping, |
127 | struct file *file, pgoff_t index, unsigned long nr_to_read) | |
128 | { | |
fcd9ae4f MWO |
129 | DEFINE_READAHEAD(ractl, file, &file->f_ra, mapping, index); |
130 | force_page_cache_ra(&ractl, nr_to_read); | |
7b3df3b9 | 131 | } |
29f175d1 | 132 | |
3392ca12 | 133 | unsigned find_lock_entries(struct address_space *mapping, pgoff_t *start, |
51dcbdac | 134 | pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices); |
9fb6beea | 135 | unsigned find_get_entries(struct address_space *mapping, pgoff_t *start, |
0e499ed3 | 136 | pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices); |
78f42660 | 137 | void filemap_free_folio(struct address_space *mapping, struct folio *folio); |
1e84a3d9 | 138 | int truncate_inode_folio(struct address_space *mapping, struct folio *folio); |
b9a8a419 MWO |
139 | bool truncate_inode_partial_folio(struct folio *folio, loff_t start, |
140 | loff_t end); | |
d6c75dc2 | 141 | long invalidate_inode_page(struct page *page); |
1a0fc811 MWO |
142 | unsigned long mapping_try_invalidate(struct address_space *mapping, |
143 | pgoff_t start, pgoff_t end, unsigned long *nr_failed); | |
5c211ba2 | 144 | |
1eb6234e | 145 | /** |
3eed3ef5 MWO |
146 | * folio_evictable - Test whether a folio is evictable. |
147 | * @folio: The folio to test. | |
1eb6234e | 148 | * |
3eed3ef5 MWO |
149 | * Test whether @folio is evictable -- i.e., should be placed on |
150 | * active/inactive lists vs unevictable list. | |
1eb6234e | 151 | * |
3eed3ef5 MWO |
152 | * Reasons folio might not be evictable: |
153 | * 1. folio's mapping marked unevictable | |
154 | * 2. One of the pages in the folio is part of an mlocked VMA | |
1eb6234e | 155 | */ |
3eed3ef5 MWO |
156 | static inline bool folio_evictable(struct folio *folio) |
157 | { | |
158 | bool ret; | |
159 | ||
160 | /* Prevent address_space of inode and swap cache from being freed */ | |
161 | rcu_read_lock(); | |
162 | ret = !mapping_unevictable(folio_mapping(folio)) && | |
163 | !folio_test_mlocked(folio); | |
164 | rcu_read_unlock(); | |
165 | return ret; | |
166 | } | |
167 | ||
7835e98b | 168 | /* |
0139aa7b | 169 | * Turn a non-refcounted page (->_refcount == 0) into refcounted with |
7835e98b NP |
170 | * a count of one. |
171 | */ | |
172 | static inline void set_page_refcounted(struct page *page) | |
173 | { | |
309381fe | 174 | VM_BUG_ON_PAGE(PageTail(page), page); |
fe896d18 | 175 | VM_BUG_ON_PAGE(page_ref_count(page), page); |
77a8a788 | 176 | set_page_count(page, 1); |
77a8a788 NP |
177 | } |
178 | ||
0201ebf2 DH |
179 | /* |
180 | * Return true if a folio needs ->release_folio() calling upon it. | |
181 | */ | |
182 | static inline bool folio_needs_release(struct folio *folio) | |
183 | { | |
b4fa966f DH |
184 | struct address_space *mapping = folio_mapping(folio); |
185 | ||
186 | return folio_has_private(folio) || | |
187 | (mapping && mapping_release_always(mapping)); | |
0201ebf2 DH |
188 | } |
189 | ||
03f6462a HD |
190 | extern unsigned long highest_memmap_pfn; |
191 | ||
c73322d0 JW |
192 | /* |
193 | * Maximum number of reclaim retries without progress before the OOM | |
194 | * killer is consider the only way forward. | |
195 | */ | |
196 | #define MAX_RECLAIM_RETRIES 16 | |
197 | ||
894bc310 LS |
198 | /* |
199 | * in mm/vmscan.c: | |
200 | */ | |
f7f9c00d | 201 | bool isolate_lru_page(struct page *page); |
be2d5756 | 202 | bool folio_isolate_lru(struct folio *folio); |
ca6d60f3 MWO |
203 | void putback_lru_page(struct page *page); |
204 | void folio_putback_lru(struct folio *folio); | |
c3f4a9a2 | 205 | extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason); |
62695a84 | 206 | |
6219049a BL |
207 | /* |
208 | * in mm/rmap.c: | |
209 | */ | |
50722804 | 210 | pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); |
6219049a | 211 | |
894bc310 LS |
212 | /* |
213 | * in mm/page_alloc.c | |
214 | */ | |
eb8589b4 | 215 | #define K(x) ((x) << (PAGE_SHIFT-10)) |
3c605096 | 216 | |
9420f89d MRI |
217 | extern char * const zone_names[MAX_NR_ZONES]; |
218 | ||
f2fc4b44 MRI |
219 | /* perform sanity checks on struct pages being allocated or freed */ |
220 | DECLARE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM, check_pages_enabled); | |
221 | ||
e95d372c KW |
222 | extern int min_free_kbytes; |
223 | ||
224 | void setup_per_zone_wmarks(void); | |
225 | void calculate_min_free_kbytes(void); | |
226 | int __meminit init_per_zone_wmark_min(void); | |
227 | void page_alloc_sysctl_init(void); | |
f2fc4b44 | 228 | |
1a6d53a1 VB |
229 | /* |
230 | * Structure for holding the mostly immutable allocation parameters passed | |
231 | * between functions involved in allocations, including the alloc_pages* | |
232 | * family of functions. | |
233 | * | |
97a225e6 | 234 | * nodemask, migratetype and highest_zoneidx are initialized only once in |
84172f4b | 235 | * __alloc_pages() and then never change. |
1a6d53a1 | 236 | * |
97a225e6 | 237 | * zonelist, preferred_zone and highest_zoneidx are set first in |
84172f4b | 238 | * __alloc_pages() for the fast path, and might be later changed |
68956ccb | 239 | * in __alloc_pages_slowpath(). All other functions pass the whole structure |
1a6d53a1 VB |
240 | * by a const pointer. |
241 | */ | |
242 | struct alloc_context { | |
243 | struct zonelist *zonelist; | |
244 | nodemask_t *nodemask; | |
c33d6c06 | 245 | struct zoneref *preferred_zoneref; |
1a6d53a1 | 246 | int migratetype; |
97a225e6 JK |
247 | |
248 | /* | |
249 | * highest_zoneidx represents highest usable zone index of | |
250 | * the allocation request. Due to the nature of the zone, | |
251 | * memory on lower zone than the highest_zoneidx will be | |
252 | * protected by lowmem_reserve[highest_zoneidx]. | |
253 | * | |
254 | * highest_zoneidx is also used by reclaim/compaction to limit | |
255 | * the target zone since higher zone than this index cannot be | |
256 | * usable for this allocation request. | |
257 | */ | |
258 | enum zone_type highest_zoneidx; | |
c9ab0c4f | 259 | bool spread_dirty_pages; |
1a6d53a1 VB |
260 | }; |
261 | ||
8170ac47 ZY |
262 | /* |
263 | * This function returns the order of a free page in the buddy system. In | |
264 | * general, page_zone(page)->lock must be held by the caller to prevent the | |
265 | * page from being allocated in parallel and returning garbage as the order. | |
266 | * If a caller does not hold page_zone(page)->lock, it must guarantee that the | |
267 | * page cannot be allocated or merged in parallel. Alternatively, it must | |
268 | * handle invalid values gracefully, and use buddy_order_unsafe() below. | |
269 | */ | |
270 | static inline unsigned int buddy_order(struct page *page) | |
271 | { | |
272 | /* PageBuddy() must be checked by the caller */ | |
273 | return page_private(page); | |
274 | } | |
275 | ||
276 | /* | |
277 | * Like buddy_order(), but for callers who cannot afford to hold the zone lock. | |
278 | * PageBuddy() should be checked first by the caller to minimize race window, | |
279 | * and invalid values must be handled gracefully. | |
280 | * | |
281 | * READ_ONCE is used so that if the caller assigns the result into a local | |
282 | * variable and e.g. tests it for valid range before using, the compiler cannot | |
283 | * decide to remove the variable and inline the page_private(page) multiple | |
284 | * times, potentially observing different values in the tests and the actual | |
285 | * use of the result. | |
286 | */ | |
287 | #define buddy_order_unsafe(page) READ_ONCE(page_private(page)) | |
288 | ||
289 | /* | |
290 | * This function checks whether a page is free && is the buddy | |
291 | * we can coalesce a page and its buddy if | |
292 | * (a) the buddy is not in a hole (check before calling!) && | |
293 | * (b) the buddy is in the buddy system && | |
294 | * (c) a page and its buddy have the same order && | |
295 | * (d) a page and its buddy are in the same zone. | |
296 | * | |
297 | * For recording whether a page is in the buddy system, we set PageBuddy. | |
298 | * Setting, clearing, and testing PageBuddy is serialized by zone->lock. | |
299 | * | |
300 | * For recording page's order, we use page_private(page). | |
301 | */ | |
302 | static inline bool page_is_buddy(struct page *page, struct page *buddy, | |
303 | unsigned int order) | |
304 | { | |
305 | if (!page_is_guard(buddy) && !PageBuddy(buddy)) | |
306 | return false; | |
307 | ||
308 | if (buddy_order(buddy) != order) | |
309 | return false; | |
310 | ||
311 | /* | |
312 | * zone check is done late to avoid uselessly calculating | |
313 | * zone/node ids for pages that could never merge. | |
314 | */ | |
315 | if (page_zone_id(page) != page_zone_id(buddy)) | |
316 | return false; | |
317 | ||
318 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); | |
319 | ||
320 | return true; | |
321 | } | |
322 | ||
3c605096 JK |
323 | /* |
324 | * Locate the struct page for both the matching buddy in our | |
325 | * pair (buddy1) and the combined O(n+1) page they form (page). | |
326 | * | |
327 | * 1) Any buddy B1 will have an order O twin B2 which satisfies | |
328 | * the following equation: | |
329 | * B2 = B1 ^ (1 << O) | |
330 | * For example, if the starting buddy (buddy2) is #8 its order | |
331 | * 1 buddy is #10: | |
332 | * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10 | |
333 | * | |
334 | * 2) Any buddy B will have an order O+1 parent P which | |
335 | * satisfies the following equation: | |
336 | * P = B & ~(1 << O) | |
337 | * | |
338 | * Assumption: *_mem_map is contiguous at least up to MAX_ORDER | |
339 | */ | |
340 | static inline unsigned long | |
76741e77 | 341 | __find_buddy_pfn(unsigned long page_pfn, unsigned int order) |
3c605096 | 342 | { |
76741e77 | 343 | return page_pfn ^ (1 << order); |
3c605096 JK |
344 | } |
345 | ||
8170ac47 ZY |
346 | /* |
347 | * Find the buddy of @page and validate it. | |
348 | * @page: The input page | |
349 | * @pfn: The pfn of the page, it saves a call to page_to_pfn() when the | |
350 | * function is used in the performance-critical __free_one_page(). | |
351 | * @order: The order of the page | |
352 | * @buddy_pfn: The output pointer to the buddy pfn, it also saves a call to | |
353 | * page_to_pfn(). | |
354 | * | |
355 | * The found buddy can be a non PageBuddy, out of @page's zone, or its order is | |
356 | * not the same as @page. The validation is necessary before use it. | |
357 | * | |
358 | * Return: the found buddy page or NULL if not found. | |
359 | */ | |
360 | static inline struct page *find_buddy_page_pfn(struct page *page, | |
361 | unsigned long pfn, unsigned int order, unsigned long *buddy_pfn) | |
362 | { | |
363 | unsigned long __buddy_pfn = __find_buddy_pfn(pfn, order); | |
364 | struct page *buddy; | |
365 | ||
366 | buddy = page + (__buddy_pfn - pfn); | |
367 | if (buddy_pfn) | |
368 | *buddy_pfn = __buddy_pfn; | |
369 | ||
370 | if (page_is_buddy(page, buddy, order)) | |
371 | return buddy; | |
372 | return NULL; | |
373 | } | |
374 | ||
7cf91a98 JK |
375 | extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn, |
376 | unsigned long end_pfn, struct zone *zone); | |
377 | ||
378 | static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn, | |
379 | unsigned long end_pfn, struct zone *zone) | |
380 | { | |
381 | if (zone->contiguous) | |
382 | return pfn_to_page(start_pfn); | |
383 | ||
384 | return __pageblock_pfn_to_page(start_pfn, end_pfn, zone); | |
385 | } | |
386 | ||
904d5857 KW |
387 | void set_zone_contiguous(struct zone *zone); |
388 | ||
389 | static inline void clear_zone_contiguous(struct zone *zone) | |
390 | { | |
391 | zone->contiguous = false; | |
392 | } | |
393 | ||
3c605096 | 394 | extern int __isolate_free_page(struct page *page, unsigned int order); |
624f58d8 AD |
395 | extern void __putback_isolated_page(struct page *page, unsigned int order, |
396 | int mt); | |
7c2ee349 | 397 | extern void memblock_free_pages(struct page *page, unsigned long pfn, |
d70ddd7a | 398 | unsigned int order); |
a9cd410a | 399 | extern void __free_pages_core(struct page *page, unsigned int order); |
9420f89d | 400 | |
1e3be485 TS |
401 | /* |
402 | * This will have no effect, other than possibly generating a warning, if the | |
403 | * caller passes in a non-large folio. | |
404 | */ | |
405 | static inline void folio_set_order(struct folio *folio, unsigned int order) | |
406 | { | |
407 | if (WARN_ON_ONCE(!order || !folio_test_large(folio))) | |
408 | return; | |
409 | ||
ebc1baf5 | 410 | folio->_flags_1 = (folio->_flags_1 & ~0xffUL) | order; |
1e3be485 TS |
411 | #ifdef CONFIG_64BIT |
412 | folio->_folio_nr_pages = 1U << order; | |
413 | #endif | |
414 | } | |
415 | ||
8dc4a8f1 MWO |
416 | void folio_undo_large_rmappable(struct folio *folio); |
417 | ||
9420f89d MRI |
418 | static inline void prep_compound_head(struct page *page, unsigned int order) |
419 | { | |
420 | struct folio *folio = (struct folio *)page; | |
421 | ||
1e3be485 | 422 | folio_set_order(folio, order); |
9420f89d MRI |
423 | atomic_set(&folio->_entire_mapcount, -1); |
424 | atomic_set(&folio->_nr_pages_mapped, 0); | |
425 | atomic_set(&folio->_pincount, 0); | |
426 | } | |
427 | ||
428 | static inline void prep_compound_tail(struct page *head, int tail_idx) | |
429 | { | |
430 | struct page *p = head + tail_idx; | |
431 | ||
432 | p->mapping = TAIL_MAPPING; | |
433 | set_compound_head(p, head); | |
434 | set_page_private(p, 0); | |
435 | } | |
436 | ||
d00181b9 | 437 | extern void prep_compound_page(struct page *page, unsigned int order); |
9420f89d | 438 | |
46f24fd8 JK |
439 | extern void post_alloc_hook(struct page *page, unsigned int order, |
440 | gfp_t gfp_flags); | |
42aa83cb | 441 | extern int user_min_free_kbytes; |
20a0307c | 442 | |
44042b44 | 443 | extern void free_unref_page(struct page *page, unsigned int order); |
0966aeb4 MWO |
444 | extern void free_unref_page_list(struct list_head *list); |
445 | ||
68265390 | 446 | extern void zone_pcp_reset(struct zone *zone); |
ec6e8c7e VB |
447 | extern void zone_pcp_disable(struct zone *zone); |
448 | extern void zone_pcp_enable(struct zone *zone); | |
9420f89d | 449 | extern void zone_pcp_init(struct zone *zone); |
68265390 | 450 | |
c803b3c8 MR |
451 | extern void *memmap_alloc(phys_addr_t size, phys_addr_t align, |
452 | phys_addr_t min_addr, | |
453 | int nid, bool exact_nid); | |
454 | ||
e95d372c KW |
455 | void memmap_init_range(unsigned long, int, unsigned long, unsigned long, |
456 | unsigned long, enum meminit_context, struct vmem_altmap *, int); | |
b2c9e2fb | 457 | |
04a42e72 | 458 | |
86d28b07 ZY |
459 | int split_free_page(struct page *free_page, |
460 | unsigned int order, unsigned long split_pfn_offset); | |
04a42e72 | 461 | |
ff9543fd MN |
462 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA |
463 | ||
464 | /* | |
465 | * in mm/compaction.c | |
466 | */ | |
467 | /* | |
468 | * compact_control is used to track pages being migrated and the free pages | |
469 | * they are being migrated to during memory compaction. The free_pfn starts | |
470 | * at the end of a zone and migrate_pfn begins at the start. Movable pages | |
471 | * are moved to the end of a zone during a compaction run and the run | |
472 | * completes when free_pfn <= migrate_pfn | |
473 | */ | |
474 | struct compact_control { | |
475 | struct list_head freepages; /* List of free pages to migrate to */ | |
476 | struct list_head migratepages; /* List of pages being migrated */ | |
c5fbd937 MG |
477 | unsigned int nr_freepages; /* Number of isolated free pages */ |
478 | unsigned int nr_migratepages; /* Number of pages to migrate */ | |
ff9543fd | 479 | unsigned long free_pfn; /* isolate_freepages search base */ |
c2ad7a1f OS |
480 | /* |
481 | * Acts as an in/out parameter to page isolation for migration. | |
482 | * isolate_migratepages uses it as a search base. | |
483 | * isolate_migratepages_block will update the value to the next pfn | |
484 | * after the last isolated one. | |
485 | */ | |
486 | unsigned long migrate_pfn; | |
70b44595 | 487 | unsigned long fast_start_pfn; /* a pfn to start linear scan from */ |
c5943b9c MG |
488 | struct zone *zone; |
489 | unsigned long total_migrate_scanned; | |
490 | unsigned long total_free_scanned; | |
dbe2d4e4 MG |
491 | unsigned short fast_search_fail;/* failures to use free list searches */ |
492 | short search_order; /* order to start a fast search at */ | |
f25ba6dc VB |
493 | const gfp_t gfp_mask; /* gfp mask of a direct compactor */ |
494 | int order; /* order a direct compactor needs */ | |
d39773a0 | 495 | int migratetype; /* migratetype of direct compactor */ |
f25ba6dc | 496 | const unsigned int alloc_flags; /* alloc flags of a direct compactor */ |
97a225e6 | 497 | const int highest_zoneidx; /* zone index of a direct compactor */ |
e0b9daeb | 498 | enum migrate_mode mode; /* Async or sync migration mode */ |
bb13ffeb | 499 | bool ignore_skip_hint; /* Scan blocks even if marked skip */ |
2583d671 | 500 | bool no_set_skip_hint; /* Don't mark blocks for skipping */ |
9f7e3387 | 501 | bool ignore_block_suitable; /* Scan blocks considered unsuitable */ |
accf6242 | 502 | bool direct_compaction; /* False from kcompactd or /proc/... */ |
facdaa91 | 503 | bool proactive_compaction; /* kcompactd proactive compaction */ |
06ed2998 | 504 | bool whole_zone; /* Whole zone should/has been scanned */ |
d56c1584 | 505 | bool contended; /* Signal lock contention */ |
48731c84 MG |
506 | bool finish_pageblock; /* Scan the remainder of a pageblock. Used |
507 | * when there are potentially transient | |
508 | * isolation or migration failures to | |
509 | * ensure forward progress. | |
510 | */ | |
b06eda09 | 511 | bool alloc_contig; /* alloc_contig_range allocation */ |
ff9543fd MN |
512 | }; |
513 | ||
5e1f0f09 MG |
514 | /* |
515 | * Used in direct compaction when a page should be taken from the freelists | |
516 | * immediately when one is created during the free path. | |
517 | */ | |
518 | struct capture_control { | |
519 | struct compact_control *cc; | |
520 | struct page *page; | |
521 | }; | |
522 | ||
ff9543fd | 523 | unsigned long |
bb13ffeb MG |
524 | isolate_freepages_range(struct compact_control *cc, |
525 | unsigned long start_pfn, unsigned long end_pfn); | |
c2ad7a1f | 526 | int |
edc2ca61 VB |
527 | isolate_migratepages_range(struct compact_control *cc, |
528 | unsigned long low_pfn, unsigned long end_pfn); | |
b2c9e2fb ZY |
529 | |
530 | int __alloc_contig_migrate_range(struct compact_control *cc, | |
531 | unsigned long start, unsigned long end); | |
9420f89d MRI |
532 | |
533 | /* Free whole pageblock and set its migration type to MIGRATE_CMA. */ | |
534 | void init_cma_reserved_pageblock(struct page *page); | |
535 | ||
536 | #endif /* CONFIG_COMPACTION || CONFIG_CMA */ | |
537 | ||
2149cdae JK |
538 | int find_suitable_fallback(struct free_area *area, unsigned int order, |
539 | int migratetype, bool only_stealable, bool *can_steal); | |
ff9543fd | 540 | |
62f31bd4 MRI |
541 | static inline bool free_area_empty(struct free_area *area, int migratetype) |
542 | { | |
543 | return list_empty(&area->free_list[migratetype]); | |
544 | } | |
545 | ||
30bdbb78 KK |
546 | /* |
547 | * These three helpers classifies VMAs for virtual memory accounting. | |
548 | */ | |
549 | ||
550 | /* | |
551 | * Executable code area - executable, not writable, not stack | |
552 | */ | |
d977d56c KK |
553 | static inline bool is_exec_mapping(vm_flags_t flags) |
554 | { | |
30bdbb78 | 555 | return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC; |
d977d56c KK |
556 | } |
557 | ||
30bdbb78 | 558 | /* |
00547ef7 | 559 | * Stack area (including shadow stacks) |
30bdbb78 KK |
560 | * |
561 | * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous: | |
562 | * do_mmap() forbids all other combinations. | |
563 | */ | |
d977d56c KK |
564 | static inline bool is_stack_mapping(vm_flags_t flags) |
565 | { | |
00547ef7 | 566 | return ((flags & VM_STACK) == VM_STACK) || (flags & VM_SHADOW_STACK); |
d977d56c KK |
567 | } |
568 | ||
30bdbb78 KK |
569 | /* |
570 | * Data area - private, writable, not stack | |
571 | */ | |
d977d56c KK |
572 | static inline bool is_data_mapping(vm_flags_t flags) |
573 | { | |
30bdbb78 | 574 | return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE; |
d977d56c KK |
575 | } |
576 | ||
6038def0 | 577 | /* mm/util.c */ |
e05b3453 | 578 | struct anon_vma *folio_anon_vma(struct folio *folio); |
6038def0 | 579 | |
af8e3354 | 580 | #ifdef CONFIG_MMU |
3506659e | 581 | void unmap_mapping_folio(struct folio *folio); |
fc05f566 | 582 | extern long populate_vma_page_range(struct vm_area_struct *vma, |
a78f1ccd | 583 | unsigned long start, unsigned long end, int *locked); |
4ca9b385 DH |
584 | extern long faultin_vma_page_range(struct vm_area_struct *vma, |
585 | unsigned long start, unsigned long end, | |
586 | bool write, int *locked); | |
b0cc5e89 | 587 | extern bool mlock_future_ok(struct mm_struct *mm, unsigned long flags, |
3c54a298 | 588 | unsigned long bytes); |
b291f000 | 589 | /* |
7efecffb | 590 | * mlock_vma_folio() and munlock_vma_folio(): |
cea86fe2 HD |
591 | * should be called with vma's mmap_lock held for read or write, |
592 | * under page table lock for the pte/pmd being added or removed. | |
b291f000 | 593 | * |
96f97c43 LS |
594 | * mlock is usually called at the end of page_add_*_rmap(), munlock at |
595 | * the end of page_remove_rmap(); but new anon folios are managed by | |
596 | * folio_add_lru_vma() calling mlock_new_folio(). | |
cea86fe2 HD |
597 | * |
598 | * @compound is used to include pmd mappings of THPs, but filter out | |
599 | * pte mappings of THPs, which cannot be consistently counted: a pte | |
600 | * mapping of the THP head cannot be distinguished by the page alone. | |
b291f000 | 601 | */ |
dcc5d337 MWO |
602 | void mlock_folio(struct folio *folio); |
603 | static inline void mlock_vma_folio(struct folio *folio, | |
cea86fe2 HD |
604 | struct vm_area_struct *vma, bool compound) |
605 | { | |
c8263bd6 HD |
606 | /* |
607 | * The VM_SPECIAL check here serves two purposes. | |
608 | * 1) VM_IO check prevents migration from double-counting during mlock. | |
609 | * 2) Although mmap_region() and mlock_fixup() take care that VM_LOCKED | |
610 | * is never left set on a VM_SPECIAL vma, there is an interval while | |
611 | * file->f_op->mmap() is using vm_insert_page(s), when VM_LOCKED may | |
612 | * still be set while VM_SPECIAL bits are added: so ignore it then. | |
613 | */ | |
614 | if (unlikely((vma->vm_flags & (VM_LOCKED|VM_SPECIAL)) == VM_LOCKED) && | |
dcc5d337 MWO |
615 | (compound || !folio_test_large(folio))) |
616 | mlock_folio(folio); | |
617 | } | |
618 | ||
96f97c43 | 619 | void munlock_folio(struct folio *folio); |
96f97c43 | 620 | static inline void munlock_vma_folio(struct folio *folio, |
cea86fe2 HD |
621 | struct vm_area_struct *vma, bool compound) |
622 | { | |
623 | if (unlikely(vma->vm_flags & VM_LOCKED) && | |
96f97c43 LS |
624 | (compound || !folio_test_large(folio))) |
625 | munlock_folio(folio); | |
cea86fe2 | 626 | } |
96f97c43 | 627 | |
96f97c43 LS |
628 | void mlock_new_folio(struct folio *folio); |
629 | bool need_mlock_drain(int cpu); | |
630 | void mlock_drain_local(void); | |
631 | void mlock_drain_remote(int cpu); | |
b291f000 | 632 | |
f55e1014 | 633 | extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); |
b32967ff | 634 | |
e9b61f19 | 635 | /* |
6a8e0596 MS |
636 | * Return the start of user virtual address at the specific offset within |
637 | * a vma. | |
e9b61f19 KS |
638 | */ |
639 | static inline unsigned long | |
6a8e0596 MS |
640 | vma_pgoff_address(pgoff_t pgoff, unsigned long nr_pages, |
641 | struct vm_area_struct *vma) | |
e9b61f19 | 642 | { |
494334e4 HD |
643 | unsigned long address; |
644 | ||
494334e4 HD |
645 | if (pgoff >= vma->vm_pgoff) { |
646 | address = vma->vm_start + | |
647 | ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); | |
648 | /* Check for address beyond vma (or wrapped through 0?) */ | |
649 | if (address < vma->vm_start || address >= vma->vm_end) | |
650 | address = -EFAULT; | |
6a8e0596 | 651 | } else if (pgoff + nr_pages - 1 >= vma->vm_pgoff) { |
494334e4 HD |
652 | /* Test above avoids possibility of wrap to 0 on 32-bit */ |
653 | address = vma->vm_start; | |
654 | } else { | |
655 | address = -EFAULT; | |
656 | } | |
657 | return address; | |
e9b61f19 KS |
658 | } |
659 | ||
6a8e0596 MS |
660 | /* |
661 | * Return the start of user virtual address of a page within a vma. | |
662 | * Returns -EFAULT if all of the page is outside the range of vma. | |
663 | * If page is a compound head, the entire compound page is considered. | |
664 | */ | |
665 | static inline unsigned long | |
666 | vma_address(struct page *page, struct vm_area_struct *vma) | |
667 | { | |
668 | VM_BUG_ON_PAGE(PageKsm(page), page); /* KSM page->index unusable */ | |
669 | return vma_pgoff_address(page_to_pgoff(page), compound_nr(page), vma); | |
670 | } | |
671 | ||
494334e4 | 672 | /* |
2aff7a47 | 673 | * Then at what user virtual address will none of the range be found in vma? |
494334e4 | 674 | * Assumes that vma_address() already returned a good starting address. |
494334e4 | 675 | */ |
2aff7a47 | 676 | static inline unsigned long vma_address_end(struct page_vma_mapped_walk *pvmw) |
e9b61f19 | 677 | { |
2aff7a47 | 678 | struct vm_area_struct *vma = pvmw->vma; |
494334e4 HD |
679 | pgoff_t pgoff; |
680 | unsigned long address; | |
681 | ||
2aff7a47 MWO |
682 | /* Common case, plus ->pgoff is invalid for KSM */ |
683 | if (pvmw->nr_pages == 1) | |
684 | return pvmw->address + PAGE_SIZE; | |
685 | ||
686 | pgoff = pvmw->pgoff + pvmw->nr_pages; | |
494334e4 HD |
687 | address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); |
688 | /* Check for address beyond vma (or wrapped through 0?) */ | |
689 | if (address < vma->vm_start || address > vma->vm_end) | |
690 | address = vma->vm_end; | |
691 | return address; | |
e9b61f19 KS |
692 | } |
693 | ||
89b15332 JW |
694 | static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf, |
695 | struct file *fpin) | |
696 | { | |
697 | int flags = vmf->flags; | |
698 | ||
699 | if (fpin) | |
700 | return fpin; | |
701 | ||
702 | /* | |
703 | * FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or | |
c1e8d7c6 | 704 | * anything, so we only pin the file and drop the mmap_lock if only |
4064b982 | 705 | * FAULT_FLAG_ALLOW_RETRY is set, while this is the first attempt. |
89b15332 | 706 | */ |
4064b982 PX |
707 | if (fault_flag_allow_retry_first(flags) && |
708 | !(flags & FAULT_FLAG_RETRY_NOWAIT)) { | |
89b15332 | 709 | fpin = get_file(vmf->vma->vm_file); |
0790e1e2 | 710 | release_fault_lock(vmf); |
89b15332 JW |
711 | } |
712 | return fpin; | |
713 | } | |
af8e3354 | 714 | #else /* !CONFIG_MMU */ |
3506659e | 715 | static inline void unmap_mapping_folio(struct folio *folio) { } |
96f97c43 LS |
716 | static inline void mlock_new_folio(struct folio *folio) { } |
717 | static inline bool need_mlock_drain(int cpu) { return false; } | |
718 | static inline void mlock_drain_local(void) { } | |
719 | static inline void mlock_drain_remote(int cpu) { } | |
4ad0ae8c NP |
720 | static inline void vunmap_range_noflush(unsigned long start, unsigned long end) |
721 | { | |
722 | } | |
af8e3354 | 723 | #endif /* !CONFIG_MMU */ |
894bc310 | 724 | |
6b74ab97 | 725 | /* Memory initialisation debug and verification */ |
9420f89d MRI |
726 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
727 | DECLARE_STATIC_KEY_TRUE(deferred_pages); | |
728 | ||
729 | bool __init deferred_grow_zone(struct zone *zone, unsigned int order); | |
730 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ | |
731 | ||
6b74ab97 MG |
732 | enum mminit_level { |
733 | MMINIT_WARNING, | |
734 | MMINIT_VERIFY, | |
735 | MMINIT_TRACE | |
736 | }; | |
737 | ||
738 | #ifdef CONFIG_DEBUG_MEMORY_INIT | |
739 | ||
740 | extern int mminit_loglevel; | |
741 | ||
742 | #define mminit_dprintk(level, prefix, fmt, arg...) \ | |
743 | do { \ | |
744 | if (level < mminit_loglevel) { \ | |
fc5199d1 | 745 | if (level <= MMINIT_WARNING) \ |
1170532b | 746 | pr_warn("mminit::" prefix " " fmt, ##arg); \ |
fc5199d1 RV |
747 | else \ |
748 | printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \ | |
6b74ab97 MG |
749 | } \ |
750 | } while (0) | |
751 | ||
708614e6 | 752 | extern void mminit_verify_pageflags_layout(void); |
68ad8df4 | 753 | extern void mminit_verify_zonelist(void); |
6b74ab97 MG |
754 | #else |
755 | ||
756 | static inline void mminit_dprintk(enum mminit_level level, | |
757 | const char *prefix, const char *fmt, ...) | |
758 | { | |
759 | } | |
760 | ||
708614e6 MG |
761 | static inline void mminit_verify_pageflags_layout(void) |
762 | { | |
763 | } | |
764 | ||
68ad8df4 MG |
765 | static inline void mminit_verify_zonelist(void) |
766 | { | |
767 | } | |
6b74ab97 | 768 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
2dbb51c4 | 769 | |
a5f5f91d MG |
770 | #define NODE_RECLAIM_NOSCAN -2 |
771 | #define NODE_RECLAIM_FULL -1 | |
772 | #define NODE_RECLAIM_SOME 0 | |
773 | #define NODE_RECLAIM_SUCCESS 1 | |
7c116f2b | 774 | |
8b09549c WY |
775 | #ifdef CONFIG_NUMA |
776 | extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int); | |
79c28a41 | 777 | extern int find_next_best_node(int node, nodemask_t *used_node_mask); |
8b09549c WY |
778 | #else |
779 | static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask, | |
780 | unsigned int order) | |
781 | { | |
782 | return NODE_RECLAIM_NOSCAN; | |
783 | } | |
79c28a41 DH |
784 | static inline int find_next_best_node(int node, nodemask_t *used_node_mask) |
785 | { | |
786 | return NUMA_NO_NODE; | |
787 | } | |
8b09549c WY |
788 | #endif |
789 | ||
60f272f6 | 790 | /* |
791 | * mm/memory-failure.c | |
792 | */ | |
31d3d348 WF |
793 | extern int hwpoison_filter(struct page *p); |
794 | ||
7c116f2b WF |
795 | extern u32 hwpoison_filter_dev_major; |
796 | extern u32 hwpoison_filter_dev_minor; | |
478c5ffc WF |
797 | extern u64 hwpoison_filter_flags_mask; |
798 | extern u64 hwpoison_filter_flags_value; | |
4fd466eb | 799 | extern u64 hwpoison_filter_memcg; |
1bfe5feb | 800 | extern u32 hwpoison_filter_enable; |
eb36c587 | 801 | |
dc0ef0df | 802 | extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long, |
eb36c587 | 803 | unsigned long, unsigned long, |
9fbeb5ab | 804 | unsigned long, unsigned long); |
ca57df79 XQ |
805 | |
806 | extern void set_pageblock_order(void); | |
4bf4f155 | 807 | unsigned long reclaim_pages(struct list_head *folio_list); |
730ec8c0 | 808 | unsigned int reclaim_clean_pages_from_list(struct zone *zone, |
4bf4f155 | 809 | struct list_head *folio_list); |
d95ea5d1 BZ |
810 | /* The ALLOC_WMARK bits are used as an index to zone->watermark */ |
811 | #define ALLOC_WMARK_MIN WMARK_MIN | |
812 | #define ALLOC_WMARK_LOW WMARK_LOW | |
813 | #define ALLOC_WMARK_HIGH WMARK_HIGH | |
814 | #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */ | |
815 | ||
816 | /* Mask to get the watermark bits */ | |
817 | #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1) | |
818 | ||
cd04ae1e MH |
819 | /* |
820 | * Only MMU archs have async oom victim reclaim - aka oom_reaper so we | |
821 | * cannot assume a reduced access to memory reserves is sufficient for | |
822 | * !MMU | |
823 | */ | |
824 | #ifdef CONFIG_MMU | |
825 | #define ALLOC_OOM 0x08 | |
826 | #else | |
827 | #define ALLOC_OOM ALLOC_NO_WATERMARKS | |
828 | #endif | |
829 | ||
1ebbb218 MG |
830 | #define ALLOC_NON_BLOCK 0x10 /* Caller cannot block. Allow access |
831 | * to 25% of the min watermark or | |
832 | * 62.5% if __GFP_HIGH is set. | |
833 | */ | |
524c4807 MG |
834 | #define ALLOC_MIN_RESERVE 0x20 /* __GFP_HIGH set. Allow access to 50% |
835 | * of the min watermark. | |
836 | */ | |
6bb15450 MG |
837 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ |
838 | #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */ | |
839 | #ifdef CONFIG_ZONE_DMA32 | |
840 | #define ALLOC_NOFRAGMENT 0x100 /* avoid mixing pageblock types */ | |
841 | #else | |
842 | #define ALLOC_NOFRAGMENT 0x0 | |
843 | #endif | |
eb2e2b42 | 844 | #define ALLOC_HIGHATOMIC 0x200 /* Allows access to MIGRATE_HIGHATOMIC */ |
736838e9 | 845 | #define ALLOC_KSWAPD 0x800 /* allow waking of kswapd, __GFP_KSWAPD_RECLAIM set */ |
d95ea5d1 | 846 | |
ab350885 | 847 | /* Flags that allow allocations below the min watermark. */ |
1ebbb218 | 848 | #define ALLOC_RESERVES (ALLOC_NON_BLOCK|ALLOC_MIN_RESERVE|ALLOC_HIGHATOMIC|ALLOC_OOM) |
ab350885 | 849 | |
72b252ae MG |
850 | enum ttu_flags; |
851 | struct tlbflush_unmap_batch; | |
852 | ||
ce612879 MH |
853 | |
854 | /* | |
855 | * only for MM internal work items which do not depend on | |
856 | * any allocations or locks which might depend on allocations | |
857 | */ | |
858 | extern struct workqueue_struct *mm_percpu_wq; | |
859 | ||
72b252ae MG |
860 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
861 | void try_to_unmap_flush(void); | |
d950c947 | 862 | void try_to_unmap_flush_dirty(void); |
3ea27719 | 863 | void flush_tlb_batched_pending(struct mm_struct *mm); |
72b252ae MG |
864 | #else |
865 | static inline void try_to_unmap_flush(void) | |
866 | { | |
867 | } | |
d950c947 MG |
868 | static inline void try_to_unmap_flush_dirty(void) |
869 | { | |
870 | } | |
3ea27719 MG |
871 | static inline void flush_tlb_batched_pending(struct mm_struct *mm) |
872 | { | |
873 | } | |
72b252ae | 874 | #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */ |
edf14cdb VB |
875 | |
876 | extern const struct trace_print_flags pageflag_names[]; | |
4c85c0be | 877 | extern const struct trace_print_flags pagetype_names[]; |
edf14cdb VB |
878 | extern const struct trace_print_flags vmaflag_names[]; |
879 | extern const struct trace_print_flags gfpflag_names[]; | |
880 | ||
a6ffdc07 XQ |
881 | static inline bool is_migrate_highatomic(enum migratetype migratetype) |
882 | { | |
883 | return migratetype == MIGRATE_HIGHATOMIC; | |
884 | } | |
885 | ||
886 | static inline bool is_migrate_highatomic_page(struct page *page) | |
887 | { | |
888 | return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC; | |
889 | } | |
890 | ||
72675e13 | 891 | void setup_zone_pageset(struct zone *zone); |
19fc7bed JK |
892 | |
893 | struct migration_target_control { | |
894 | int nid; /* preferred node id */ | |
895 | nodemask_t *nmask; | |
896 | gfp_t gfp_mask; | |
897 | }; | |
898 | ||
07073eb0 DH |
899 | /* |
900 | * mm/filemap.c | |
901 | */ | |
902 | size_t splice_folio_into_pipe(struct pipe_inode_info *pipe, | |
903 | struct folio *folio, loff_t fpos, size_t size); | |
904 | ||
b67177ec NP |
905 | /* |
906 | * mm/vmalloc.c | |
907 | */ | |
4ad0ae8c | 908 | #ifdef CONFIG_MMU |
b6714911 | 909 | void __init vmalloc_init(void); |
d905ae2b | 910 | int __must_check vmap_pages_range_noflush(unsigned long addr, unsigned long end, |
b67177ec | 911 | pgprot_t prot, struct page **pages, unsigned int page_shift); |
4ad0ae8c | 912 | #else |
b6714911 MRI |
913 | static inline void vmalloc_init(void) |
914 | { | |
915 | } | |
916 | ||
4ad0ae8c | 917 | static inline |
d905ae2b | 918 | int __must_check vmap_pages_range_noflush(unsigned long addr, unsigned long end, |
4ad0ae8c NP |
919 | pgprot_t prot, struct page **pages, unsigned int page_shift) |
920 | { | |
921 | return -EINVAL; | |
922 | } | |
923 | #endif | |
924 | ||
d905ae2b AP |
925 | int __must_check __vmap_pages_range_noflush(unsigned long addr, |
926 | unsigned long end, pgprot_t prot, | |
927 | struct page **pages, unsigned int page_shift); | |
b073d7f8 | 928 | |
4ad0ae8c | 929 | void vunmap_range_noflush(unsigned long start, unsigned long end); |
b67177ec | 930 | |
b073d7f8 AP |
931 | void __vunmap_range_noflush(unsigned long start, unsigned long end); |
932 | ||
f4c0d836 YS |
933 | int numa_migrate_prep(struct page *page, struct vm_area_struct *vma, |
934 | unsigned long addr, int page_nid, int *flags); | |
935 | ||
27674ef6 | 936 | void free_zone_device_page(struct page *page); |
b05a79d4 | 937 | int migrate_device_coherent_page(struct page *page); |
27674ef6 | 938 | |
ece1ed7b MWO |
939 | /* |
940 | * mm/gup.c | |
941 | */ | |
942 | struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags); | |
7ce154fe | 943 | int __must_check try_grab_page(struct page *page, unsigned int flags); |
ece1ed7b | 944 | |
8b9c1cc0 DH |
945 | /* |
946 | * mm/huge_memory.c | |
947 | */ | |
948 | struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, | |
949 | unsigned long addr, pmd_t *pmd, | |
950 | unsigned int flags); | |
951 | ||
2c224108 JG |
952 | enum { |
953 | /* mark page accessed */ | |
954 | FOLL_TOUCH = 1 << 16, | |
955 | /* a retry, previous pass started an IO */ | |
956 | FOLL_TRIED = 1 << 17, | |
957 | /* we are working on non-current tsk/mm */ | |
958 | FOLL_REMOTE = 1 << 18, | |
959 | /* pages must be released via unpin_user_page */ | |
960 | FOLL_PIN = 1 << 19, | |
961 | /* gup_fast: prevent fall-back to slow gup */ | |
962 | FOLL_FAST_ONLY = 1 << 20, | |
963 | /* allow unlocking the mmap lock */ | |
964 | FOLL_UNLOCKABLE = 1 << 21, | |
965 | }; | |
966 | ||
63b60512 JG |
967 | /* |
968 | * Indicates for which pages that are write-protected in the page table, | |
969 | * whether GUP has to trigger unsharing via FAULT_FLAG_UNSHARE such that the | |
970 | * GUP pin will remain consistent with the pages mapped into the page tables | |
971 | * of the MM. | |
972 | * | |
973 | * Temporary unmapping of PageAnonExclusive() pages or clearing of | |
974 | * PageAnonExclusive() has to protect against concurrent GUP: | |
975 | * * Ordinary GUP: Using the PT lock | |
976 | * * GUP-fast and fork(): mm->write_protect_seq | |
977 | * * GUP-fast and KSM or temporary unmapping (swap, migration): see | |
978 | * page_try_share_anon_rmap() | |
979 | * | |
980 | * Must be called with the (sub)page that's actually referenced via the | |
981 | * page table entry, which might not necessarily be the head page for a | |
982 | * PTE-mapped THP. | |
983 | * | |
984 | * If the vma is NULL, we're coming from the GUP-fast path and might have | |
985 | * to fallback to the slow path just to lookup the vma. | |
986 | */ | |
987 | static inline bool gup_must_unshare(struct vm_area_struct *vma, | |
988 | unsigned int flags, struct page *page) | |
989 | { | |
990 | /* | |
991 | * FOLL_WRITE is implicitly handled correctly as the page table entry | |
992 | * has to be writable -- and if it references (part of) an anonymous | |
993 | * folio, that part is required to be marked exclusive. | |
994 | */ | |
995 | if ((flags & (FOLL_WRITE | FOLL_PIN)) != FOLL_PIN) | |
996 | return false; | |
997 | /* | |
998 | * Note: PageAnon(page) is stable until the page is actually getting | |
999 | * freed. | |
1000 | */ | |
1001 | if (!PageAnon(page)) { | |
1002 | /* | |
1003 | * We only care about R/O long-term pining: R/O short-term | |
1004 | * pinning does not have the semantics to observe successive | |
1005 | * changes through the process page tables. | |
1006 | */ | |
1007 | if (!(flags & FOLL_LONGTERM)) | |
1008 | return false; | |
1009 | ||
1010 | /* We really need the vma ... */ | |
1011 | if (!vma) | |
1012 | return true; | |
1013 | ||
1014 | /* | |
1015 | * ... because we only care about writable private ("COW") | |
1016 | * mappings where we have to break COW early. | |
1017 | */ | |
1018 | return is_cow_mapping(vma->vm_flags); | |
1019 | } | |
1020 | ||
1021 | /* Paired with a memory barrier in page_try_share_anon_rmap(). */ | |
1022 | if (IS_ENABLED(CONFIG_HAVE_FAST_GUP)) | |
1023 | smp_rmb(); | |
1024 | ||
5805192c DH |
1025 | /* |
1026 | * During GUP-fast we might not get called on the head page for a | |
1027 | * hugetlb page that is mapped using cont-PTE, because GUP-fast does | |
1028 | * not work with the abstracted hugetlb PTEs that always point at the | |
1029 | * head page. For hugetlb, PageAnonExclusive only applies on the head | |
1030 | * page (as it cannot be partially COW-shared), so lookup the head page. | |
1031 | */ | |
1032 | if (unlikely(!PageHead(page) && PageHuge(page))) | |
1033 | page = compound_head(page); | |
1034 | ||
63b60512 JG |
1035 | /* |
1036 | * Note that PageKsm() pages cannot be exclusive, and consequently, | |
1037 | * cannot get pinned. | |
1038 | */ | |
1039 | return !PageAnonExclusive(page); | |
1040 | } | |
ece1ed7b | 1041 | |
902c2d91 | 1042 | extern bool mirrored_kernelcore; |
0db31d63 | 1043 | extern bool memblock_has_mirror(void); |
902c2d91 | 1044 | |
76aefad6 PX |
1045 | static inline bool vma_soft_dirty_enabled(struct vm_area_struct *vma) |
1046 | { | |
1047 | /* | |
1048 | * NOTE: we must check this before VM_SOFTDIRTY on soft-dirty | |
1049 | * enablements, because when without soft-dirty being compiled in, | |
1050 | * VM_SOFTDIRTY is defined as 0x0, then !(vm_flags & VM_SOFTDIRTY) | |
1051 | * will be constantly true. | |
1052 | */ | |
1053 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
1054 | return false; | |
1055 | ||
1056 | /* | |
1057 | * Soft-dirty is kind of special: its tracking is enabled when the | |
1058 | * vma flags not set. | |
1059 | */ | |
1060 | return !(vma->vm_flags & VM_SOFTDIRTY); | |
1061 | } | |
1062 | ||
53bee98d LH |
1063 | static inline void vma_iter_config(struct vma_iterator *vmi, |
1064 | unsigned long index, unsigned long last) | |
1065 | { | |
1066 | MAS_BUG_ON(&vmi->mas, vmi->mas.node != MAS_START && | |
1067 | (vmi->mas.index > index || vmi->mas.last < index)); | |
1068 | __mas_set_range(&vmi->mas, index, last - 1); | |
1069 | } | |
1070 | ||
b62b633e LH |
1071 | /* |
1072 | * VMA Iterator functions shared between nommu and mmap | |
1073 | */ | |
b5df0922 LH |
1074 | static inline int vma_iter_prealloc(struct vma_iterator *vmi, |
1075 | struct vm_area_struct *vma) | |
b62b633e | 1076 | { |
b5df0922 | 1077 | return mas_preallocate(&vmi->mas, vma, GFP_KERNEL); |
b62b633e LH |
1078 | } |
1079 | ||
b5df0922 | 1080 | static inline void vma_iter_clear(struct vma_iterator *vmi) |
b62b633e | 1081 | { |
b62b633e LH |
1082 | mas_store_prealloc(&vmi->mas, NULL); |
1083 | } | |
1084 | ||
f72cf24a LH |
1085 | static inline int vma_iter_clear_gfp(struct vma_iterator *vmi, |
1086 | unsigned long start, unsigned long end, gfp_t gfp) | |
1087 | { | |
b5df0922 | 1088 | __mas_set_range(&vmi->mas, start, end - 1); |
f72cf24a LH |
1089 | mas_store_gfp(&vmi->mas, NULL, gfp); |
1090 | if (unlikely(mas_is_err(&vmi->mas))) | |
1091 | return -ENOMEM; | |
1092 | ||
1093 | return 0; | |
1094 | } | |
1095 | ||
b62b633e LH |
1096 | static inline struct vm_area_struct *vma_iter_load(struct vma_iterator *vmi) |
1097 | { | |
1098 | return mas_walk(&vmi->mas); | |
1099 | } | |
1100 | ||
1101 | /* Store a VMA with preallocated memory */ | |
1102 | static inline void vma_iter_store(struct vma_iterator *vmi, | |
1103 | struct vm_area_struct *vma) | |
1104 | { | |
1105 | ||
1106 | #if defined(CONFIG_DEBUG_VM_MAPLE_TREE) | |
36bd9310 LH |
1107 | if (MAS_WARN_ON(&vmi->mas, vmi->mas.node != MAS_START && |
1108 | vmi->mas.index > vma->vm_start)) { | |
1109 | pr_warn("%lx > %lx\n store vma %lx-%lx\n into slot %lx-%lx\n", | |
1110 | vmi->mas.index, vma->vm_start, vma->vm_start, | |
1111 | vma->vm_end, vmi->mas.index, vmi->mas.last); | |
b62b633e | 1112 | } |
36bd9310 LH |
1113 | if (MAS_WARN_ON(&vmi->mas, vmi->mas.node != MAS_START && |
1114 | vmi->mas.last < vma->vm_start)) { | |
1115 | pr_warn("%lx < %lx\nstore vma %lx-%lx\ninto slot %lx-%lx\n", | |
1116 | vmi->mas.last, vma->vm_start, vma->vm_start, vma->vm_end, | |
1117 | vmi->mas.index, vmi->mas.last); | |
b62b633e LH |
1118 | } |
1119 | #endif | |
1120 | ||
1121 | if (vmi->mas.node != MAS_START && | |
1122 | ((vmi->mas.index > vma->vm_start) || (vmi->mas.last < vma->vm_start))) | |
1123 | vma_iter_invalidate(vmi); | |
1124 | ||
b5df0922 | 1125 | __mas_set_range(&vmi->mas, vma->vm_start, vma->vm_end - 1); |
b62b633e LH |
1126 | mas_store_prealloc(&vmi->mas, vma); |
1127 | } | |
1128 | ||
1129 | static inline int vma_iter_store_gfp(struct vma_iterator *vmi, | |
1130 | struct vm_area_struct *vma, gfp_t gfp) | |
1131 | { | |
1132 | if (vmi->mas.node != MAS_START && | |
1133 | ((vmi->mas.index > vma->vm_start) || (vmi->mas.last < vma->vm_start))) | |
1134 | vma_iter_invalidate(vmi); | |
1135 | ||
b5df0922 | 1136 | __mas_set_range(&vmi->mas, vma->vm_start, vma->vm_end - 1); |
b62b633e LH |
1137 | mas_store_gfp(&vmi->mas, vma, gfp); |
1138 | if (unlikely(mas_is_err(&vmi->mas))) | |
1139 | return -ENOMEM; | |
1140 | ||
1141 | return 0; | |
1142 | } | |
440703e0 LH |
1143 | |
1144 | /* | |
1145 | * VMA lock generalization | |
1146 | */ | |
1147 | struct vma_prepare { | |
1148 | struct vm_area_struct *vma; | |
1149 | struct vm_area_struct *adj_next; | |
1150 | struct file *file; | |
1151 | struct address_space *mapping; | |
1152 | struct anon_vma *anon_vma; | |
1153 | struct vm_area_struct *insert; | |
1154 | struct vm_area_struct *remove; | |
1155 | struct vm_area_struct *remove2; | |
1156 | }; | |
3ee0aa9f QZ |
1157 | |
1158 | /* shrinker related functions */ | |
96f7b2b9 QZ |
1159 | unsigned long shrink_slab(gfp_t gfp_mask, int nid, struct mem_cgroup *memcg, |
1160 | int priority); | |
3ee0aa9f QZ |
1161 | |
1162 | #ifdef CONFIG_SHRINKER_DEBUG | |
1163 | extern int shrinker_debugfs_add(struct shrinker *shrinker); | |
1164 | extern struct dentry *shrinker_debugfs_detach(struct shrinker *shrinker, | |
1165 | int *debugfs_id); | |
1166 | extern void shrinker_debugfs_remove(struct dentry *debugfs_entry, | |
1167 | int debugfs_id); | |
1168 | #else /* CONFIG_SHRINKER_DEBUG */ | |
1169 | static inline int shrinker_debugfs_add(struct shrinker *shrinker) | |
1170 | { | |
1171 | return 0; | |
1172 | } | |
1173 | static inline struct dentry *shrinker_debugfs_detach(struct shrinker *shrinker, | |
1174 | int *debugfs_id) | |
1175 | { | |
1176 | *debugfs_id = -1; | |
1177 | return NULL; | |
1178 | } | |
1179 | static inline void shrinker_debugfs_remove(struct dentry *debugfs_entry, | |
1180 | int debugfs_id) | |
1181 | { | |
1182 | } | |
1183 | #endif /* CONFIG_SHRINKER_DEBUG */ | |
1184 | ||
db971418 | 1185 | #endif /* __MM_INTERNAL_H */ |