Commit | Line | Data |
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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 | ||
64 | /* | |
65 | * How many individual pages have an elevated _mapcount. Excludes | |
66 | * the folio's entire_mapcount. | |
67 | */ | |
68 | static inline int folio_nr_pages_mapped(struct folio *folio) | |
69 | { | |
70 | return atomic_read(&folio->_nr_pages_mapped) & FOLIO_PAGES_MAPPED; | |
71 | } | |
72 | ||
64601000 MWO |
73 | static inline void *folio_raw_mapping(struct folio *folio) |
74 | { | |
75 | unsigned long mapping = (unsigned long)folio->mapping; | |
76 | ||
77 | return (void *)(mapping & ~PAGE_MAPPING_FLAGS); | |
78 | } | |
79 | ||
512b7931 | 80 | void __acct_reclaim_writeback(pg_data_t *pgdat, struct folio *folio, |
8cd7c588 | 81 | int nr_throttled); |
512b7931 | 82 | static inline void acct_reclaim_writeback(struct folio *folio) |
8cd7c588 | 83 | { |
512b7931 | 84 | pg_data_t *pgdat = folio_pgdat(folio); |
8cd7c588 MG |
85 | int nr_throttled = atomic_read(&pgdat->nr_writeback_throttled); |
86 | ||
87 | if (nr_throttled) | |
512b7931 | 88 | __acct_reclaim_writeback(pgdat, folio, nr_throttled); |
8cd7c588 MG |
89 | } |
90 | ||
d818fca1 MG |
91 | static inline void wake_throttle_isolated(pg_data_t *pgdat) |
92 | { | |
93 | wait_queue_head_t *wqh; | |
94 | ||
95 | wqh = &pgdat->reclaim_wait[VMSCAN_THROTTLE_ISOLATED]; | |
96 | if (waitqueue_active(wqh)) | |
97 | wake_up(wqh); | |
98 | } | |
99 | ||
2b740303 | 100 | vm_fault_t do_swap_page(struct vm_fault *vmf); |
575ced1c | 101 | void folio_rotate_reclaimable(struct folio *folio); |
269ccca3 | 102 | bool __folio_end_writeback(struct folio *folio); |
261b6840 | 103 | void deactivate_file_folio(struct folio *folio); |
018ee47f | 104 | void folio_activate(struct folio *folio); |
8a966ed7 | 105 | |
763ecb03 LH |
106 | void free_pgtables(struct mmu_gather *tlb, struct maple_tree *mt, |
107 | struct vm_area_struct *start_vma, unsigned long floor, | |
98e51a22 | 108 | unsigned long ceiling, bool mm_wr_locked); |
03c4f204 | 109 | void pmd_install(struct mm_struct *mm, pmd_t *pmd, pgtable_t *pte); |
42b77728 | 110 | |
3506659e | 111 | struct zap_details; |
aac45363 MH |
112 | void unmap_page_range(struct mmu_gather *tlb, |
113 | struct vm_area_struct *vma, | |
114 | unsigned long addr, unsigned long end, | |
115 | struct zap_details *details); | |
116 | ||
56a4d67c MWO |
117 | void page_cache_ra_order(struct readahead_control *, struct file_ra_state *, |
118 | unsigned int order); | |
fcd9ae4f | 119 | void force_page_cache_ra(struct readahead_control *, unsigned long nr); |
7b3df3b9 DH |
120 | static inline void force_page_cache_readahead(struct address_space *mapping, |
121 | struct file *file, pgoff_t index, unsigned long nr_to_read) | |
122 | { | |
fcd9ae4f MWO |
123 | DEFINE_READAHEAD(ractl, file, &file->f_ra, mapping, index); |
124 | force_page_cache_ra(&ractl, nr_to_read); | |
7b3df3b9 | 125 | } |
29f175d1 | 126 | |
3392ca12 | 127 | unsigned find_lock_entries(struct address_space *mapping, pgoff_t *start, |
51dcbdac | 128 | pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices); |
9fb6beea | 129 | unsigned find_get_entries(struct address_space *mapping, pgoff_t *start, |
0e499ed3 | 130 | pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices); |
78f42660 | 131 | void filemap_free_folio(struct address_space *mapping, struct folio *folio); |
1e84a3d9 | 132 | int truncate_inode_folio(struct address_space *mapping, struct folio *folio); |
b9a8a419 MWO |
133 | bool truncate_inode_partial_folio(struct folio *folio, loff_t start, |
134 | loff_t end); | |
d6c75dc2 | 135 | long invalidate_inode_page(struct page *page); |
1a0fc811 MWO |
136 | unsigned long mapping_try_invalidate(struct address_space *mapping, |
137 | pgoff_t start, pgoff_t end, unsigned long *nr_failed); | |
5c211ba2 | 138 | |
1eb6234e | 139 | /** |
3eed3ef5 MWO |
140 | * folio_evictable - Test whether a folio is evictable. |
141 | * @folio: The folio to test. | |
1eb6234e | 142 | * |
3eed3ef5 MWO |
143 | * Test whether @folio is evictable -- i.e., should be placed on |
144 | * active/inactive lists vs unevictable list. | |
1eb6234e | 145 | * |
3eed3ef5 MWO |
146 | * Reasons folio might not be evictable: |
147 | * 1. folio's mapping marked unevictable | |
148 | * 2. One of the pages in the folio is part of an mlocked VMA | |
1eb6234e | 149 | */ |
3eed3ef5 MWO |
150 | static inline bool folio_evictable(struct folio *folio) |
151 | { | |
152 | bool ret; | |
153 | ||
154 | /* Prevent address_space of inode and swap cache from being freed */ | |
155 | rcu_read_lock(); | |
156 | ret = !mapping_unevictable(folio_mapping(folio)) && | |
157 | !folio_test_mlocked(folio); | |
158 | rcu_read_unlock(); | |
159 | return ret; | |
160 | } | |
161 | ||
7835e98b | 162 | /* |
0139aa7b | 163 | * Turn a non-refcounted page (->_refcount == 0) into refcounted with |
7835e98b NP |
164 | * a count of one. |
165 | */ | |
166 | static inline void set_page_refcounted(struct page *page) | |
167 | { | |
309381fe | 168 | VM_BUG_ON_PAGE(PageTail(page), page); |
fe896d18 | 169 | VM_BUG_ON_PAGE(page_ref_count(page), page); |
77a8a788 | 170 | set_page_count(page, 1); |
77a8a788 NP |
171 | } |
172 | ||
03f6462a HD |
173 | extern unsigned long highest_memmap_pfn; |
174 | ||
c73322d0 JW |
175 | /* |
176 | * Maximum number of reclaim retries without progress before the OOM | |
177 | * killer is consider the only way forward. | |
178 | */ | |
179 | #define MAX_RECLAIM_RETRIES 16 | |
180 | ||
894bc310 LS |
181 | /* |
182 | * in mm/vmscan.c: | |
183 | */ | |
f7f9c00d | 184 | bool isolate_lru_page(struct page *page); |
be2d5756 | 185 | bool folio_isolate_lru(struct folio *folio); |
ca6d60f3 MWO |
186 | void putback_lru_page(struct page *page); |
187 | void folio_putback_lru(struct folio *folio); | |
c3f4a9a2 | 188 | extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason); |
62695a84 | 189 | |
6219049a BL |
190 | /* |
191 | * in mm/rmap.c: | |
192 | */ | |
50722804 | 193 | pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); |
6219049a | 194 | |
894bc310 LS |
195 | /* |
196 | * in mm/page_alloc.c | |
197 | */ | |
eb8589b4 | 198 | #define K(x) ((x) << (PAGE_SHIFT-10)) |
3c605096 | 199 | |
9420f89d MRI |
200 | extern char * const zone_names[MAX_NR_ZONES]; |
201 | ||
f2fc4b44 MRI |
202 | /* perform sanity checks on struct pages being allocated or freed */ |
203 | DECLARE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM, check_pages_enabled); | |
204 | ||
e95d372c KW |
205 | extern int min_free_kbytes; |
206 | ||
207 | void setup_per_zone_wmarks(void); | |
208 | void calculate_min_free_kbytes(void); | |
209 | int __meminit init_per_zone_wmark_min(void); | |
210 | void page_alloc_sysctl_init(void); | |
f2fc4b44 | 211 | |
1a6d53a1 VB |
212 | /* |
213 | * Structure for holding the mostly immutable allocation parameters passed | |
214 | * between functions involved in allocations, including the alloc_pages* | |
215 | * family of functions. | |
216 | * | |
97a225e6 | 217 | * nodemask, migratetype and highest_zoneidx are initialized only once in |
84172f4b | 218 | * __alloc_pages() and then never change. |
1a6d53a1 | 219 | * |
97a225e6 | 220 | * zonelist, preferred_zone and highest_zoneidx are set first in |
84172f4b | 221 | * __alloc_pages() for the fast path, and might be later changed |
68956ccb | 222 | * in __alloc_pages_slowpath(). All other functions pass the whole structure |
1a6d53a1 VB |
223 | * by a const pointer. |
224 | */ | |
225 | struct alloc_context { | |
226 | struct zonelist *zonelist; | |
227 | nodemask_t *nodemask; | |
c33d6c06 | 228 | struct zoneref *preferred_zoneref; |
1a6d53a1 | 229 | int migratetype; |
97a225e6 JK |
230 | |
231 | /* | |
232 | * highest_zoneidx represents highest usable zone index of | |
233 | * the allocation request. Due to the nature of the zone, | |
234 | * memory on lower zone than the highest_zoneidx will be | |
235 | * protected by lowmem_reserve[highest_zoneidx]. | |
236 | * | |
237 | * highest_zoneidx is also used by reclaim/compaction to limit | |
238 | * the target zone since higher zone than this index cannot be | |
239 | * usable for this allocation request. | |
240 | */ | |
241 | enum zone_type highest_zoneidx; | |
c9ab0c4f | 242 | bool spread_dirty_pages; |
1a6d53a1 VB |
243 | }; |
244 | ||
8170ac47 ZY |
245 | /* |
246 | * This function returns the order of a free page in the buddy system. In | |
247 | * general, page_zone(page)->lock must be held by the caller to prevent the | |
248 | * page from being allocated in parallel and returning garbage as the order. | |
249 | * If a caller does not hold page_zone(page)->lock, it must guarantee that the | |
250 | * page cannot be allocated or merged in parallel. Alternatively, it must | |
251 | * handle invalid values gracefully, and use buddy_order_unsafe() below. | |
252 | */ | |
253 | static inline unsigned int buddy_order(struct page *page) | |
254 | { | |
255 | /* PageBuddy() must be checked by the caller */ | |
256 | return page_private(page); | |
257 | } | |
258 | ||
259 | /* | |
260 | * Like buddy_order(), but for callers who cannot afford to hold the zone lock. | |
261 | * PageBuddy() should be checked first by the caller to minimize race window, | |
262 | * and invalid values must be handled gracefully. | |
263 | * | |
264 | * READ_ONCE is used so that if the caller assigns the result into a local | |
265 | * variable and e.g. tests it for valid range before using, the compiler cannot | |
266 | * decide to remove the variable and inline the page_private(page) multiple | |
267 | * times, potentially observing different values in the tests and the actual | |
268 | * use of the result. | |
269 | */ | |
270 | #define buddy_order_unsafe(page) READ_ONCE(page_private(page)) | |
271 | ||
272 | /* | |
273 | * This function checks whether a page is free && is the buddy | |
274 | * we can coalesce a page and its buddy if | |
275 | * (a) the buddy is not in a hole (check before calling!) && | |
276 | * (b) the buddy is in the buddy system && | |
277 | * (c) a page and its buddy have the same order && | |
278 | * (d) a page and its buddy are in the same zone. | |
279 | * | |
280 | * For recording whether a page is in the buddy system, we set PageBuddy. | |
281 | * Setting, clearing, and testing PageBuddy is serialized by zone->lock. | |
282 | * | |
283 | * For recording page's order, we use page_private(page). | |
284 | */ | |
285 | static inline bool page_is_buddy(struct page *page, struct page *buddy, | |
286 | unsigned int order) | |
287 | { | |
288 | if (!page_is_guard(buddy) && !PageBuddy(buddy)) | |
289 | return false; | |
290 | ||
291 | if (buddy_order(buddy) != order) | |
292 | return false; | |
293 | ||
294 | /* | |
295 | * zone check is done late to avoid uselessly calculating | |
296 | * zone/node ids for pages that could never merge. | |
297 | */ | |
298 | if (page_zone_id(page) != page_zone_id(buddy)) | |
299 | return false; | |
300 | ||
301 | VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); | |
302 | ||
303 | return true; | |
304 | } | |
305 | ||
3c605096 JK |
306 | /* |
307 | * Locate the struct page for both the matching buddy in our | |
308 | * pair (buddy1) and the combined O(n+1) page they form (page). | |
309 | * | |
310 | * 1) Any buddy B1 will have an order O twin B2 which satisfies | |
311 | * the following equation: | |
312 | * B2 = B1 ^ (1 << O) | |
313 | * For example, if the starting buddy (buddy2) is #8 its order | |
314 | * 1 buddy is #10: | |
315 | * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10 | |
316 | * | |
317 | * 2) Any buddy B will have an order O+1 parent P which | |
318 | * satisfies the following equation: | |
319 | * P = B & ~(1 << O) | |
320 | * | |
321 | * Assumption: *_mem_map is contiguous at least up to MAX_ORDER | |
322 | */ | |
323 | static inline unsigned long | |
76741e77 | 324 | __find_buddy_pfn(unsigned long page_pfn, unsigned int order) |
3c605096 | 325 | { |
76741e77 | 326 | return page_pfn ^ (1 << order); |
3c605096 JK |
327 | } |
328 | ||
8170ac47 ZY |
329 | /* |
330 | * Find the buddy of @page and validate it. | |
331 | * @page: The input page | |
332 | * @pfn: The pfn of the page, it saves a call to page_to_pfn() when the | |
333 | * function is used in the performance-critical __free_one_page(). | |
334 | * @order: The order of the page | |
335 | * @buddy_pfn: The output pointer to the buddy pfn, it also saves a call to | |
336 | * page_to_pfn(). | |
337 | * | |
338 | * The found buddy can be a non PageBuddy, out of @page's zone, or its order is | |
339 | * not the same as @page. The validation is necessary before use it. | |
340 | * | |
341 | * Return: the found buddy page or NULL if not found. | |
342 | */ | |
343 | static inline struct page *find_buddy_page_pfn(struct page *page, | |
344 | unsigned long pfn, unsigned int order, unsigned long *buddy_pfn) | |
345 | { | |
346 | unsigned long __buddy_pfn = __find_buddy_pfn(pfn, order); | |
347 | struct page *buddy; | |
348 | ||
349 | buddy = page + (__buddy_pfn - pfn); | |
350 | if (buddy_pfn) | |
351 | *buddy_pfn = __buddy_pfn; | |
352 | ||
353 | if (page_is_buddy(page, buddy, order)) | |
354 | return buddy; | |
355 | return NULL; | |
356 | } | |
357 | ||
7cf91a98 JK |
358 | extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn, |
359 | unsigned long end_pfn, struct zone *zone); | |
360 | ||
361 | static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn, | |
362 | unsigned long end_pfn, struct zone *zone) | |
363 | { | |
364 | if (zone->contiguous) | |
365 | return pfn_to_page(start_pfn); | |
366 | ||
367 | return __pageblock_pfn_to_page(start_pfn, end_pfn, zone); | |
368 | } | |
369 | ||
904d5857 KW |
370 | void set_zone_contiguous(struct zone *zone); |
371 | ||
372 | static inline void clear_zone_contiguous(struct zone *zone) | |
373 | { | |
374 | zone->contiguous = false; | |
375 | } | |
376 | ||
3c605096 | 377 | extern int __isolate_free_page(struct page *page, unsigned int order); |
624f58d8 AD |
378 | extern void __putback_isolated_page(struct page *page, unsigned int order, |
379 | int mt); | |
7c2ee349 | 380 | extern void memblock_free_pages(struct page *page, unsigned long pfn, |
d70ddd7a | 381 | unsigned int order); |
a9cd410a | 382 | extern void __free_pages_core(struct page *page, unsigned int order); |
9420f89d | 383 | |
1e3be485 TS |
384 | /* |
385 | * This will have no effect, other than possibly generating a warning, if the | |
386 | * caller passes in a non-large folio. | |
387 | */ | |
388 | static inline void folio_set_order(struct folio *folio, unsigned int order) | |
389 | { | |
390 | if (WARN_ON_ONCE(!order || !folio_test_large(folio))) | |
391 | return; | |
392 | ||
393 | folio->_folio_order = order; | |
394 | #ifdef CONFIG_64BIT | |
395 | folio->_folio_nr_pages = 1U << order; | |
396 | #endif | |
397 | } | |
398 | ||
9420f89d MRI |
399 | static inline void prep_compound_head(struct page *page, unsigned int order) |
400 | { | |
401 | struct folio *folio = (struct folio *)page; | |
402 | ||
b95826c9 | 403 | folio_set_compound_dtor(folio, COMPOUND_PAGE_DTOR); |
1e3be485 | 404 | folio_set_order(folio, order); |
9420f89d MRI |
405 | atomic_set(&folio->_entire_mapcount, -1); |
406 | atomic_set(&folio->_nr_pages_mapped, 0); | |
407 | atomic_set(&folio->_pincount, 0); | |
408 | } | |
409 | ||
410 | static inline void prep_compound_tail(struct page *head, int tail_idx) | |
411 | { | |
412 | struct page *p = head + tail_idx; | |
413 | ||
414 | p->mapping = TAIL_MAPPING; | |
415 | set_compound_head(p, head); | |
416 | set_page_private(p, 0); | |
417 | } | |
418 | ||
d00181b9 | 419 | extern void prep_compound_page(struct page *page, unsigned int order); |
9420f89d | 420 | |
46f24fd8 JK |
421 | extern void post_alloc_hook(struct page *page, unsigned int order, |
422 | gfp_t gfp_flags); | |
42aa83cb | 423 | extern int user_min_free_kbytes; |
20a0307c | 424 | |
44042b44 | 425 | extern void free_unref_page(struct page *page, unsigned int order); |
0966aeb4 MWO |
426 | extern void free_unref_page_list(struct list_head *list); |
427 | ||
68265390 | 428 | extern void zone_pcp_reset(struct zone *zone); |
ec6e8c7e VB |
429 | extern void zone_pcp_disable(struct zone *zone); |
430 | extern void zone_pcp_enable(struct zone *zone); | |
9420f89d | 431 | extern void zone_pcp_init(struct zone *zone); |
68265390 | 432 | |
c803b3c8 MR |
433 | extern void *memmap_alloc(phys_addr_t size, phys_addr_t align, |
434 | phys_addr_t min_addr, | |
435 | int nid, bool exact_nid); | |
436 | ||
e95d372c KW |
437 | void memmap_init_range(unsigned long, int, unsigned long, unsigned long, |
438 | unsigned long, enum meminit_context, struct vmem_altmap *, int); | |
b2c9e2fb | 439 | |
04a42e72 | 440 | |
86d28b07 ZY |
441 | int split_free_page(struct page *free_page, |
442 | unsigned int order, unsigned long split_pfn_offset); | |
04a42e72 | 443 | |
ff9543fd MN |
444 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA |
445 | ||
446 | /* | |
447 | * in mm/compaction.c | |
448 | */ | |
449 | /* | |
450 | * compact_control is used to track pages being migrated and the free pages | |
451 | * they are being migrated to during memory compaction. The free_pfn starts | |
452 | * at the end of a zone and migrate_pfn begins at the start. Movable pages | |
453 | * are moved to the end of a zone during a compaction run and the run | |
454 | * completes when free_pfn <= migrate_pfn | |
455 | */ | |
456 | struct compact_control { | |
457 | struct list_head freepages; /* List of free pages to migrate to */ | |
458 | struct list_head migratepages; /* List of pages being migrated */ | |
c5fbd937 MG |
459 | unsigned int nr_freepages; /* Number of isolated free pages */ |
460 | unsigned int nr_migratepages; /* Number of pages to migrate */ | |
ff9543fd | 461 | unsigned long free_pfn; /* isolate_freepages search base */ |
c2ad7a1f OS |
462 | /* |
463 | * Acts as an in/out parameter to page isolation for migration. | |
464 | * isolate_migratepages uses it as a search base. | |
465 | * isolate_migratepages_block will update the value to the next pfn | |
466 | * after the last isolated one. | |
467 | */ | |
468 | unsigned long migrate_pfn; | |
70b44595 | 469 | unsigned long fast_start_pfn; /* a pfn to start linear scan from */ |
c5943b9c MG |
470 | struct zone *zone; |
471 | unsigned long total_migrate_scanned; | |
472 | unsigned long total_free_scanned; | |
dbe2d4e4 MG |
473 | unsigned short fast_search_fail;/* failures to use free list searches */ |
474 | short search_order; /* order to start a fast search at */ | |
f25ba6dc VB |
475 | const gfp_t gfp_mask; /* gfp mask of a direct compactor */ |
476 | int order; /* order a direct compactor needs */ | |
d39773a0 | 477 | int migratetype; /* migratetype of direct compactor */ |
f25ba6dc | 478 | const unsigned int alloc_flags; /* alloc flags of a direct compactor */ |
97a225e6 | 479 | const int highest_zoneidx; /* zone index of a direct compactor */ |
e0b9daeb | 480 | enum migrate_mode mode; /* Async or sync migration mode */ |
bb13ffeb | 481 | bool ignore_skip_hint; /* Scan blocks even if marked skip */ |
2583d671 | 482 | bool no_set_skip_hint; /* Don't mark blocks for skipping */ |
9f7e3387 | 483 | bool ignore_block_suitable; /* Scan blocks considered unsuitable */ |
accf6242 | 484 | bool direct_compaction; /* False from kcompactd or /proc/... */ |
facdaa91 | 485 | bool proactive_compaction; /* kcompactd proactive compaction */ |
06ed2998 | 486 | bool whole_zone; /* Whole zone should/has been scanned */ |
d56c1584 | 487 | bool contended; /* Signal lock contention */ |
48731c84 MG |
488 | bool finish_pageblock; /* Scan the remainder of a pageblock. Used |
489 | * when there are potentially transient | |
490 | * isolation or migration failures to | |
491 | * ensure forward progress. | |
492 | */ | |
b06eda09 | 493 | bool alloc_contig; /* alloc_contig_range allocation */ |
ff9543fd MN |
494 | }; |
495 | ||
5e1f0f09 MG |
496 | /* |
497 | * Used in direct compaction when a page should be taken from the freelists | |
498 | * immediately when one is created during the free path. | |
499 | */ | |
500 | struct capture_control { | |
501 | struct compact_control *cc; | |
502 | struct page *page; | |
503 | }; | |
504 | ||
ff9543fd | 505 | unsigned long |
bb13ffeb MG |
506 | isolate_freepages_range(struct compact_control *cc, |
507 | unsigned long start_pfn, unsigned long end_pfn); | |
c2ad7a1f | 508 | int |
edc2ca61 VB |
509 | isolate_migratepages_range(struct compact_control *cc, |
510 | unsigned long low_pfn, unsigned long end_pfn); | |
b2c9e2fb ZY |
511 | |
512 | int __alloc_contig_migrate_range(struct compact_control *cc, | |
513 | unsigned long start, unsigned long end); | |
9420f89d MRI |
514 | |
515 | /* Free whole pageblock and set its migration type to MIGRATE_CMA. */ | |
516 | void init_cma_reserved_pageblock(struct page *page); | |
517 | ||
518 | #endif /* CONFIG_COMPACTION || CONFIG_CMA */ | |
519 | ||
2149cdae JK |
520 | int find_suitable_fallback(struct free_area *area, unsigned int order, |
521 | int migratetype, bool only_stealable, bool *can_steal); | |
ff9543fd | 522 | |
62f31bd4 MRI |
523 | static inline bool free_area_empty(struct free_area *area, int migratetype) |
524 | { | |
525 | return list_empty(&area->free_list[migratetype]); | |
526 | } | |
527 | ||
30bdbb78 KK |
528 | /* |
529 | * These three helpers classifies VMAs for virtual memory accounting. | |
530 | */ | |
531 | ||
532 | /* | |
533 | * Executable code area - executable, not writable, not stack | |
534 | */ | |
d977d56c KK |
535 | static inline bool is_exec_mapping(vm_flags_t flags) |
536 | { | |
30bdbb78 | 537 | return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC; |
d977d56c KK |
538 | } |
539 | ||
30bdbb78 | 540 | /* |
f0953a1b | 541 | * Stack area - automatically grows in one direction |
30bdbb78 KK |
542 | * |
543 | * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous: | |
544 | * do_mmap() forbids all other combinations. | |
545 | */ | |
d977d56c KK |
546 | static inline bool is_stack_mapping(vm_flags_t flags) |
547 | { | |
30bdbb78 | 548 | return (flags & VM_STACK) == VM_STACK; |
d977d56c KK |
549 | } |
550 | ||
30bdbb78 KK |
551 | /* |
552 | * Data area - private, writable, not stack | |
553 | */ | |
d977d56c KK |
554 | static inline bool is_data_mapping(vm_flags_t flags) |
555 | { | |
30bdbb78 | 556 | return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE; |
d977d56c KK |
557 | } |
558 | ||
6038def0 | 559 | /* mm/util.c */ |
e05b3453 | 560 | struct anon_vma *folio_anon_vma(struct folio *folio); |
6038def0 | 561 | |
af8e3354 | 562 | #ifdef CONFIG_MMU |
3506659e | 563 | void unmap_mapping_folio(struct folio *folio); |
fc05f566 | 564 | extern long populate_vma_page_range(struct vm_area_struct *vma, |
a78f1ccd | 565 | unsigned long start, unsigned long end, int *locked); |
4ca9b385 DH |
566 | extern long faultin_vma_page_range(struct vm_area_struct *vma, |
567 | unsigned long start, unsigned long end, | |
568 | bool write, int *locked); | |
b0cc5e89 | 569 | extern bool mlock_future_ok(struct mm_struct *mm, unsigned long flags, |
3c54a298 | 570 | unsigned long bytes); |
b291f000 | 571 | /* |
7efecffb | 572 | * mlock_vma_folio() and munlock_vma_folio(): |
cea86fe2 HD |
573 | * should be called with vma's mmap_lock held for read or write, |
574 | * under page table lock for the pte/pmd being added or removed. | |
b291f000 | 575 | * |
96f97c43 LS |
576 | * mlock is usually called at the end of page_add_*_rmap(), munlock at |
577 | * the end of page_remove_rmap(); but new anon folios are managed by | |
578 | * folio_add_lru_vma() calling mlock_new_folio(). | |
cea86fe2 HD |
579 | * |
580 | * @compound is used to include pmd mappings of THPs, but filter out | |
581 | * pte mappings of THPs, which cannot be consistently counted: a pte | |
582 | * mapping of the THP head cannot be distinguished by the page alone. | |
b291f000 | 583 | */ |
dcc5d337 MWO |
584 | void mlock_folio(struct folio *folio); |
585 | static inline void mlock_vma_folio(struct folio *folio, | |
cea86fe2 HD |
586 | struct vm_area_struct *vma, bool compound) |
587 | { | |
c8263bd6 HD |
588 | /* |
589 | * The VM_SPECIAL check here serves two purposes. | |
590 | * 1) VM_IO check prevents migration from double-counting during mlock. | |
591 | * 2) Although mmap_region() and mlock_fixup() take care that VM_LOCKED | |
592 | * is never left set on a VM_SPECIAL vma, there is an interval while | |
593 | * file->f_op->mmap() is using vm_insert_page(s), when VM_LOCKED may | |
594 | * still be set while VM_SPECIAL bits are added: so ignore it then. | |
595 | */ | |
596 | if (unlikely((vma->vm_flags & (VM_LOCKED|VM_SPECIAL)) == VM_LOCKED) && | |
dcc5d337 MWO |
597 | (compound || !folio_test_large(folio))) |
598 | mlock_folio(folio); | |
599 | } | |
600 | ||
96f97c43 | 601 | void munlock_folio(struct folio *folio); |
96f97c43 | 602 | static inline void munlock_vma_folio(struct folio *folio, |
cea86fe2 HD |
603 | struct vm_area_struct *vma, bool compound) |
604 | { | |
605 | if (unlikely(vma->vm_flags & VM_LOCKED) && | |
96f97c43 LS |
606 | (compound || !folio_test_large(folio))) |
607 | munlock_folio(folio); | |
cea86fe2 | 608 | } |
96f97c43 | 609 | |
96f97c43 LS |
610 | void mlock_new_folio(struct folio *folio); |
611 | bool need_mlock_drain(int cpu); | |
612 | void mlock_drain_local(void); | |
613 | void mlock_drain_remote(int cpu); | |
b291f000 | 614 | |
f55e1014 | 615 | extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); |
b32967ff | 616 | |
e9b61f19 | 617 | /* |
6a8e0596 MS |
618 | * Return the start of user virtual address at the specific offset within |
619 | * a vma. | |
e9b61f19 KS |
620 | */ |
621 | static inline unsigned long | |
6a8e0596 MS |
622 | vma_pgoff_address(pgoff_t pgoff, unsigned long nr_pages, |
623 | struct vm_area_struct *vma) | |
e9b61f19 | 624 | { |
494334e4 HD |
625 | unsigned long address; |
626 | ||
494334e4 HD |
627 | if (pgoff >= vma->vm_pgoff) { |
628 | address = vma->vm_start + | |
629 | ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); | |
630 | /* Check for address beyond vma (or wrapped through 0?) */ | |
631 | if (address < vma->vm_start || address >= vma->vm_end) | |
632 | address = -EFAULT; | |
6a8e0596 | 633 | } else if (pgoff + nr_pages - 1 >= vma->vm_pgoff) { |
494334e4 HD |
634 | /* Test above avoids possibility of wrap to 0 on 32-bit */ |
635 | address = vma->vm_start; | |
636 | } else { | |
637 | address = -EFAULT; | |
638 | } | |
639 | return address; | |
e9b61f19 KS |
640 | } |
641 | ||
6a8e0596 MS |
642 | /* |
643 | * Return the start of user virtual address of a page within a vma. | |
644 | * Returns -EFAULT if all of the page is outside the range of vma. | |
645 | * If page is a compound head, the entire compound page is considered. | |
646 | */ | |
647 | static inline unsigned long | |
648 | vma_address(struct page *page, struct vm_area_struct *vma) | |
649 | { | |
650 | VM_BUG_ON_PAGE(PageKsm(page), page); /* KSM page->index unusable */ | |
651 | return vma_pgoff_address(page_to_pgoff(page), compound_nr(page), vma); | |
652 | } | |
653 | ||
494334e4 | 654 | /* |
2aff7a47 | 655 | * Then at what user virtual address will none of the range be found in vma? |
494334e4 | 656 | * Assumes that vma_address() already returned a good starting address. |
494334e4 | 657 | */ |
2aff7a47 | 658 | static inline unsigned long vma_address_end(struct page_vma_mapped_walk *pvmw) |
e9b61f19 | 659 | { |
2aff7a47 | 660 | struct vm_area_struct *vma = pvmw->vma; |
494334e4 HD |
661 | pgoff_t pgoff; |
662 | unsigned long address; | |
663 | ||
2aff7a47 MWO |
664 | /* Common case, plus ->pgoff is invalid for KSM */ |
665 | if (pvmw->nr_pages == 1) | |
666 | return pvmw->address + PAGE_SIZE; | |
667 | ||
668 | pgoff = pvmw->pgoff + pvmw->nr_pages; | |
494334e4 HD |
669 | address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); |
670 | /* Check for address beyond vma (or wrapped through 0?) */ | |
671 | if (address < vma->vm_start || address > vma->vm_end) | |
672 | address = vma->vm_end; | |
673 | return address; | |
e9b61f19 KS |
674 | } |
675 | ||
89b15332 JW |
676 | static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf, |
677 | struct file *fpin) | |
678 | { | |
679 | int flags = vmf->flags; | |
680 | ||
681 | if (fpin) | |
682 | return fpin; | |
683 | ||
684 | /* | |
685 | * FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or | |
c1e8d7c6 | 686 | * anything, so we only pin the file and drop the mmap_lock if only |
4064b982 | 687 | * FAULT_FLAG_ALLOW_RETRY is set, while this is the first attempt. |
89b15332 | 688 | */ |
4064b982 PX |
689 | if (fault_flag_allow_retry_first(flags) && |
690 | !(flags & FAULT_FLAG_RETRY_NOWAIT)) { | |
89b15332 | 691 | fpin = get_file(vmf->vma->vm_file); |
d8ed45c5 | 692 | mmap_read_unlock(vmf->vma->vm_mm); |
89b15332 JW |
693 | } |
694 | return fpin; | |
695 | } | |
af8e3354 | 696 | #else /* !CONFIG_MMU */ |
3506659e | 697 | static inline void unmap_mapping_folio(struct folio *folio) { } |
96f97c43 LS |
698 | static inline void mlock_new_folio(struct folio *folio) { } |
699 | static inline bool need_mlock_drain(int cpu) { return false; } | |
700 | static inline void mlock_drain_local(void) { } | |
701 | static inline void mlock_drain_remote(int cpu) { } | |
4ad0ae8c NP |
702 | static inline void vunmap_range_noflush(unsigned long start, unsigned long end) |
703 | { | |
704 | } | |
af8e3354 | 705 | #endif /* !CONFIG_MMU */ |
894bc310 | 706 | |
6b74ab97 | 707 | /* Memory initialisation debug and verification */ |
9420f89d MRI |
708 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
709 | DECLARE_STATIC_KEY_TRUE(deferred_pages); | |
710 | ||
711 | bool __init deferred_grow_zone(struct zone *zone, unsigned int order); | |
712 | #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ | |
713 | ||
6b74ab97 MG |
714 | enum mminit_level { |
715 | MMINIT_WARNING, | |
716 | MMINIT_VERIFY, | |
717 | MMINIT_TRACE | |
718 | }; | |
719 | ||
720 | #ifdef CONFIG_DEBUG_MEMORY_INIT | |
721 | ||
722 | extern int mminit_loglevel; | |
723 | ||
724 | #define mminit_dprintk(level, prefix, fmt, arg...) \ | |
725 | do { \ | |
726 | if (level < mminit_loglevel) { \ | |
fc5199d1 | 727 | if (level <= MMINIT_WARNING) \ |
1170532b | 728 | pr_warn("mminit::" prefix " " fmt, ##arg); \ |
fc5199d1 RV |
729 | else \ |
730 | printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \ | |
6b74ab97 MG |
731 | } \ |
732 | } while (0) | |
733 | ||
708614e6 | 734 | extern void mminit_verify_pageflags_layout(void); |
68ad8df4 | 735 | extern void mminit_verify_zonelist(void); |
6b74ab97 MG |
736 | #else |
737 | ||
738 | static inline void mminit_dprintk(enum mminit_level level, | |
739 | const char *prefix, const char *fmt, ...) | |
740 | { | |
741 | } | |
742 | ||
708614e6 MG |
743 | static inline void mminit_verify_pageflags_layout(void) |
744 | { | |
745 | } | |
746 | ||
68ad8df4 MG |
747 | static inline void mminit_verify_zonelist(void) |
748 | { | |
749 | } | |
6b74ab97 | 750 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
2dbb51c4 | 751 | |
a5f5f91d MG |
752 | #define NODE_RECLAIM_NOSCAN -2 |
753 | #define NODE_RECLAIM_FULL -1 | |
754 | #define NODE_RECLAIM_SOME 0 | |
755 | #define NODE_RECLAIM_SUCCESS 1 | |
7c116f2b | 756 | |
8b09549c WY |
757 | #ifdef CONFIG_NUMA |
758 | extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int); | |
79c28a41 | 759 | extern int find_next_best_node(int node, nodemask_t *used_node_mask); |
8b09549c WY |
760 | #else |
761 | static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask, | |
762 | unsigned int order) | |
763 | { | |
764 | return NODE_RECLAIM_NOSCAN; | |
765 | } | |
79c28a41 DH |
766 | static inline int find_next_best_node(int node, nodemask_t *used_node_mask) |
767 | { | |
768 | return NUMA_NO_NODE; | |
769 | } | |
8b09549c WY |
770 | #endif |
771 | ||
60f272f6 | 772 | /* |
773 | * mm/memory-failure.c | |
774 | */ | |
31d3d348 WF |
775 | extern int hwpoison_filter(struct page *p); |
776 | ||
7c116f2b WF |
777 | extern u32 hwpoison_filter_dev_major; |
778 | extern u32 hwpoison_filter_dev_minor; | |
478c5ffc WF |
779 | extern u64 hwpoison_filter_flags_mask; |
780 | extern u64 hwpoison_filter_flags_value; | |
4fd466eb | 781 | extern u64 hwpoison_filter_memcg; |
1bfe5feb | 782 | extern u32 hwpoison_filter_enable; |
eb36c587 | 783 | |
dc0ef0df | 784 | extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long, |
eb36c587 | 785 | unsigned long, unsigned long, |
9fbeb5ab | 786 | unsigned long, unsigned long); |
ca57df79 XQ |
787 | |
788 | extern void set_pageblock_order(void); | |
4bf4f155 | 789 | unsigned long reclaim_pages(struct list_head *folio_list); |
730ec8c0 | 790 | unsigned int reclaim_clean_pages_from_list(struct zone *zone, |
4bf4f155 | 791 | struct list_head *folio_list); |
d95ea5d1 BZ |
792 | /* The ALLOC_WMARK bits are used as an index to zone->watermark */ |
793 | #define ALLOC_WMARK_MIN WMARK_MIN | |
794 | #define ALLOC_WMARK_LOW WMARK_LOW | |
795 | #define ALLOC_WMARK_HIGH WMARK_HIGH | |
796 | #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */ | |
797 | ||
798 | /* Mask to get the watermark bits */ | |
799 | #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1) | |
800 | ||
cd04ae1e MH |
801 | /* |
802 | * Only MMU archs have async oom victim reclaim - aka oom_reaper so we | |
803 | * cannot assume a reduced access to memory reserves is sufficient for | |
804 | * !MMU | |
805 | */ | |
806 | #ifdef CONFIG_MMU | |
807 | #define ALLOC_OOM 0x08 | |
808 | #else | |
809 | #define ALLOC_OOM ALLOC_NO_WATERMARKS | |
810 | #endif | |
811 | ||
1ebbb218 MG |
812 | #define ALLOC_NON_BLOCK 0x10 /* Caller cannot block. Allow access |
813 | * to 25% of the min watermark or | |
814 | * 62.5% if __GFP_HIGH is set. | |
815 | */ | |
524c4807 MG |
816 | #define ALLOC_MIN_RESERVE 0x20 /* __GFP_HIGH set. Allow access to 50% |
817 | * of the min watermark. | |
818 | */ | |
6bb15450 MG |
819 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ |
820 | #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */ | |
821 | #ifdef CONFIG_ZONE_DMA32 | |
822 | #define ALLOC_NOFRAGMENT 0x100 /* avoid mixing pageblock types */ | |
823 | #else | |
824 | #define ALLOC_NOFRAGMENT 0x0 | |
825 | #endif | |
eb2e2b42 | 826 | #define ALLOC_HIGHATOMIC 0x200 /* Allows access to MIGRATE_HIGHATOMIC */ |
736838e9 | 827 | #define ALLOC_KSWAPD 0x800 /* allow waking of kswapd, __GFP_KSWAPD_RECLAIM set */ |
d95ea5d1 | 828 | |
ab350885 | 829 | /* Flags that allow allocations below the min watermark. */ |
1ebbb218 | 830 | #define ALLOC_RESERVES (ALLOC_NON_BLOCK|ALLOC_MIN_RESERVE|ALLOC_HIGHATOMIC|ALLOC_OOM) |
ab350885 | 831 | |
72b252ae MG |
832 | enum ttu_flags; |
833 | struct tlbflush_unmap_batch; | |
834 | ||
ce612879 MH |
835 | |
836 | /* | |
837 | * only for MM internal work items which do not depend on | |
838 | * any allocations or locks which might depend on allocations | |
839 | */ | |
840 | extern struct workqueue_struct *mm_percpu_wq; | |
841 | ||
72b252ae MG |
842 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
843 | void try_to_unmap_flush(void); | |
d950c947 | 844 | void try_to_unmap_flush_dirty(void); |
3ea27719 | 845 | void flush_tlb_batched_pending(struct mm_struct *mm); |
72b252ae MG |
846 | #else |
847 | static inline void try_to_unmap_flush(void) | |
848 | { | |
849 | } | |
d950c947 MG |
850 | static inline void try_to_unmap_flush_dirty(void) |
851 | { | |
852 | } | |
3ea27719 MG |
853 | static inline void flush_tlb_batched_pending(struct mm_struct *mm) |
854 | { | |
855 | } | |
72b252ae | 856 | #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */ |
edf14cdb VB |
857 | |
858 | extern const struct trace_print_flags pageflag_names[]; | |
4c85c0be | 859 | extern const struct trace_print_flags pagetype_names[]; |
edf14cdb VB |
860 | extern const struct trace_print_flags vmaflag_names[]; |
861 | extern const struct trace_print_flags gfpflag_names[]; | |
862 | ||
a6ffdc07 XQ |
863 | static inline bool is_migrate_highatomic(enum migratetype migratetype) |
864 | { | |
865 | return migratetype == MIGRATE_HIGHATOMIC; | |
866 | } | |
867 | ||
868 | static inline bool is_migrate_highatomic_page(struct page *page) | |
869 | { | |
870 | return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC; | |
871 | } | |
872 | ||
72675e13 | 873 | void setup_zone_pageset(struct zone *zone); |
19fc7bed JK |
874 | |
875 | struct migration_target_control { | |
876 | int nid; /* preferred node id */ | |
877 | nodemask_t *nmask; | |
878 | gfp_t gfp_mask; | |
879 | }; | |
880 | ||
07073eb0 DH |
881 | /* |
882 | * mm/filemap.c | |
883 | */ | |
884 | size_t splice_folio_into_pipe(struct pipe_inode_info *pipe, | |
885 | struct folio *folio, loff_t fpos, size_t size); | |
886 | ||
b67177ec NP |
887 | /* |
888 | * mm/vmalloc.c | |
889 | */ | |
4ad0ae8c | 890 | #ifdef CONFIG_MMU |
b6714911 | 891 | void __init vmalloc_init(void); |
d905ae2b | 892 | int __must_check vmap_pages_range_noflush(unsigned long addr, unsigned long end, |
b67177ec | 893 | pgprot_t prot, struct page **pages, unsigned int page_shift); |
4ad0ae8c | 894 | #else |
b6714911 MRI |
895 | static inline void vmalloc_init(void) |
896 | { | |
897 | } | |
898 | ||
4ad0ae8c | 899 | static inline |
d905ae2b | 900 | int __must_check vmap_pages_range_noflush(unsigned long addr, unsigned long end, |
4ad0ae8c NP |
901 | pgprot_t prot, struct page **pages, unsigned int page_shift) |
902 | { | |
903 | return -EINVAL; | |
904 | } | |
905 | #endif | |
906 | ||
d905ae2b AP |
907 | int __must_check __vmap_pages_range_noflush(unsigned long addr, |
908 | unsigned long end, pgprot_t prot, | |
909 | struct page **pages, unsigned int page_shift); | |
b073d7f8 | 910 | |
4ad0ae8c | 911 | void vunmap_range_noflush(unsigned long start, unsigned long end); |
b67177ec | 912 | |
b073d7f8 AP |
913 | void __vunmap_range_noflush(unsigned long start, unsigned long end); |
914 | ||
f4c0d836 YS |
915 | int numa_migrate_prep(struct page *page, struct vm_area_struct *vma, |
916 | unsigned long addr, int page_nid, int *flags); | |
917 | ||
27674ef6 | 918 | void free_zone_device_page(struct page *page); |
b05a79d4 | 919 | int migrate_device_coherent_page(struct page *page); |
27674ef6 | 920 | |
ece1ed7b MWO |
921 | /* |
922 | * mm/gup.c | |
923 | */ | |
924 | struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags); | |
7ce154fe | 925 | int __must_check try_grab_page(struct page *page, unsigned int flags); |
ece1ed7b | 926 | |
2c224108 JG |
927 | enum { |
928 | /* mark page accessed */ | |
929 | FOLL_TOUCH = 1 << 16, | |
930 | /* a retry, previous pass started an IO */ | |
931 | FOLL_TRIED = 1 << 17, | |
932 | /* we are working on non-current tsk/mm */ | |
933 | FOLL_REMOTE = 1 << 18, | |
934 | /* pages must be released via unpin_user_page */ | |
935 | FOLL_PIN = 1 << 19, | |
936 | /* gup_fast: prevent fall-back to slow gup */ | |
937 | FOLL_FAST_ONLY = 1 << 20, | |
938 | /* allow unlocking the mmap lock */ | |
939 | FOLL_UNLOCKABLE = 1 << 21, | |
940 | }; | |
941 | ||
63b60512 JG |
942 | /* |
943 | * Indicates for which pages that are write-protected in the page table, | |
944 | * whether GUP has to trigger unsharing via FAULT_FLAG_UNSHARE such that the | |
945 | * GUP pin will remain consistent with the pages mapped into the page tables | |
946 | * of the MM. | |
947 | * | |
948 | * Temporary unmapping of PageAnonExclusive() pages or clearing of | |
949 | * PageAnonExclusive() has to protect against concurrent GUP: | |
950 | * * Ordinary GUP: Using the PT lock | |
951 | * * GUP-fast and fork(): mm->write_protect_seq | |
952 | * * GUP-fast and KSM or temporary unmapping (swap, migration): see | |
953 | * page_try_share_anon_rmap() | |
954 | * | |
955 | * Must be called with the (sub)page that's actually referenced via the | |
956 | * page table entry, which might not necessarily be the head page for a | |
957 | * PTE-mapped THP. | |
958 | * | |
959 | * If the vma is NULL, we're coming from the GUP-fast path and might have | |
960 | * to fallback to the slow path just to lookup the vma. | |
961 | */ | |
962 | static inline bool gup_must_unshare(struct vm_area_struct *vma, | |
963 | unsigned int flags, struct page *page) | |
964 | { | |
965 | /* | |
966 | * FOLL_WRITE is implicitly handled correctly as the page table entry | |
967 | * has to be writable -- and if it references (part of) an anonymous | |
968 | * folio, that part is required to be marked exclusive. | |
969 | */ | |
970 | if ((flags & (FOLL_WRITE | FOLL_PIN)) != FOLL_PIN) | |
971 | return false; | |
972 | /* | |
973 | * Note: PageAnon(page) is stable until the page is actually getting | |
974 | * freed. | |
975 | */ | |
976 | if (!PageAnon(page)) { | |
977 | /* | |
978 | * We only care about R/O long-term pining: R/O short-term | |
979 | * pinning does not have the semantics to observe successive | |
980 | * changes through the process page tables. | |
981 | */ | |
982 | if (!(flags & FOLL_LONGTERM)) | |
983 | return false; | |
984 | ||
985 | /* We really need the vma ... */ | |
986 | if (!vma) | |
987 | return true; | |
988 | ||
989 | /* | |
990 | * ... because we only care about writable private ("COW") | |
991 | * mappings where we have to break COW early. | |
992 | */ | |
993 | return is_cow_mapping(vma->vm_flags); | |
994 | } | |
995 | ||
996 | /* Paired with a memory barrier in page_try_share_anon_rmap(). */ | |
997 | if (IS_ENABLED(CONFIG_HAVE_FAST_GUP)) | |
998 | smp_rmb(); | |
999 | ||
1000 | /* | |
1001 | * Note that PageKsm() pages cannot be exclusive, and consequently, | |
1002 | * cannot get pinned. | |
1003 | */ | |
1004 | return !PageAnonExclusive(page); | |
1005 | } | |
ece1ed7b | 1006 | |
902c2d91 MW |
1007 | extern bool mirrored_kernelcore; |
1008 | ||
76aefad6 PX |
1009 | static inline bool vma_soft_dirty_enabled(struct vm_area_struct *vma) |
1010 | { | |
1011 | /* | |
1012 | * NOTE: we must check this before VM_SOFTDIRTY on soft-dirty | |
1013 | * enablements, because when without soft-dirty being compiled in, | |
1014 | * VM_SOFTDIRTY is defined as 0x0, then !(vm_flags & VM_SOFTDIRTY) | |
1015 | * will be constantly true. | |
1016 | */ | |
1017 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
1018 | return false; | |
1019 | ||
1020 | /* | |
1021 | * Soft-dirty is kind of special: its tracking is enabled when the | |
1022 | * vma flags not set. | |
1023 | */ | |
1024 | return !(vma->vm_flags & VM_SOFTDIRTY); | |
1025 | } | |
1026 | ||
b62b633e LH |
1027 | /* |
1028 | * VMA Iterator functions shared between nommu and mmap | |
1029 | */ | |
1030 | static inline int vma_iter_prealloc(struct vma_iterator *vmi) | |
1031 | { | |
1032 | return mas_preallocate(&vmi->mas, GFP_KERNEL); | |
1033 | } | |
1034 | ||
1035 | static inline void vma_iter_clear(struct vma_iterator *vmi, | |
1036 | unsigned long start, unsigned long end) | |
1037 | { | |
1038 | mas_set_range(&vmi->mas, start, end - 1); | |
1039 | mas_store_prealloc(&vmi->mas, NULL); | |
1040 | } | |
1041 | ||
1042 | static inline struct vm_area_struct *vma_iter_load(struct vma_iterator *vmi) | |
1043 | { | |
1044 | return mas_walk(&vmi->mas); | |
1045 | } | |
1046 | ||
1047 | /* Store a VMA with preallocated memory */ | |
1048 | static inline void vma_iter_store(struct vma_iterator *vmi, | |
1049 | struct vm_area_struct *vma) | |
1050 | { | |
1051 | ||
1052 | #if defined(CONFIG_DEBUG_VM_MAPLE_TREE) | |
36bd9310 LH |
1053 | if (MAS_WARN_ON(&vmi->mas, vmi->mas.node != MAS_START && |
1054 | vmi->mas.index > vma->vm_start)) { | |
1055 | pr_warn("%lx > %lx\n store vma %lx-%lx\n into slot %lx-%lx\n", | |
1056 | vmi->mas.index, vma->vm_start, vma->vm_start, | |
1057 | vma->vm_end, vmi->mas.index, vmi->mas.last); | |
b62b633e | 1058 | } |
36bd9310 LH |
1059 | if (MAS_WARN_ON(&vmi->mas, vmi->mas.node != MAS_START && |
1060 | vmi->mas.last < vma->vm_start)) { | |
1061 | pr_warn("%lx < %lx\nstore vma %lx-%lx\ninto slot %lx-%lx\n", | |
1062 | vmi->mas.last, vma->vm_start, vma->vm_start, vma->vm_end, | |
1063 | vmi->mas.index, vmi->mas.last); | |
b62b633e LH |
1064 | } |
1065 | #endif | |
1066 | ||
1067 | if (vmi->mas.node != MAS_START && | |
1068 | ((vmi->mas.index > vma->vm_start) || (vmi->mas.last < vma->vm_start))) | |
1069 | vma_iter_invalidate(vmi); | |
1070 | ||
1071 | vmi->mas.index = vma->vm_start; | |
1072 | vmi->mas.last = vma->vm_end - 1; | |
1073 | mas_store_prealloc(&vmi->mas, vma); | |
1074 | } | |
1075 | ||
1076 | static inline int vma_iter_store_gfp(struct vma_iterator *vmi, | |
1077 | struct vm_area_struct *vma, gfp_t gfp) | |
1078 | { | |
1079 | if (vmi->mas.node != MAS_START && | |
1080 | ((vmi->mas.index > vma->vm_start) || (vmi->mas.last < vma->vm_start))) | |
1081 | vma_iter_invalidate(vmi); | |
1082 | ||
1083 | vmi->mas.index = vma->vm_start; | |
1084 | vmi->mas.last = vma->vm_end - 1; | |
1085 | mas_store_gfp(&vmi->mas, vma, gfp); | |
1086 | if (unlikely(mas_is_err(&vmi->mas))) | |
1087 | return -ENOMEM; | |
1088 | ||
1089 | return 0; | |
1090 | } | |
440703e0 LH |
1091 | |
1092 | /* | |
1093 | * VMA lock generalization | |
1094 | */ | |
1095 | struct vma_prepare { | |
1096 | struct vm_area_struct *vma; | |
1097 | struct vm_area_struct *adj_next; | |
1098 | struct file *file; | |
1099 | struct address_space *mapping; | |
1100 | struct anon_vma *anon_vma; | |
1101 | struct vm_area_struct *insert; | |
1102 | struct vm_area_struct *remove; | |
1103 | struct vm_area_struct *remove2; | |
1104 | }; | |
db971418 | 1105 | #endif /* __MM_INTERNAL_H */ |