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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* internal.h: mm/ internal definitions
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
Nick Piggin0f8053a2006-03-22 00:08:33 -080011#ifndef __MM_INTERNAL_H
12#define __MM_INTERNAL_H
13
14#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Jan Beulich42b77722008-07-23 21:27:10 -070016void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
17 unsigned long floor, unsigned long ceiling);
18
Nick Piggin7835e982006-03-22 00:08:40 -080019static inline void set_page_count(struct page *page, int v)
Nick Piggin77a8a782006-01-06 00:10:57 -080020{
Nick Piggin7835e982006-03-22 00:08:40 -080021 atomic_set(&page->_count, v);
22}
23
24/*
25 * Turn a non-refcounted page (->_count == 0) into refcounted with
26 * a count of one.
27 */
28static inline void set_page_refcounted(struct page *page)
29{
Qi Yongae1276b2008-02-04 22:29:27 -080030 VM_BUG_ON(PageTail(page));
Nick Piggin725d7042006-09-25 23:30:55 -070031 VM_BUG_ON(atomic_read(&page->_count));
Nick Piggin77a8a782006-01-06 00:10:57 -080032 set_page_count(page, 1);
Nick Piggin77a8a782006-01-06 00:10:57 -080033}
34
Nick Piggin0f8053a2006-03-22 00:08:33 -080035static inline void __put_page(struct page *page)
36{
37 atomic_dec(&page->_count);
38}
39
Andrea Arcangeli70b50f92011-11-02 13:36:59 -070040static inline void __get_page_tail_foll(struct page *page,
41 bool get_page_head)
42{
43 /*
44 * If we're getting a tail page, the elevated page->_count is
45 * required only in the head page and we will elevate the head
46 * page->_count and tail page->_mapcount.
47 *
48 * We elevate page_tail->_mapcount for tail pages to force
49 * page_tail->_count to be zero at all times to avoid getting
50 * false positives from get_page_unless_zero() with
51 * speculative page access (like in
52 * page_cache_get_speculative()) on tail pages.
53 */
54 VM_BUG_ON(atomic_read(&page->first_page->_count) <= 0);
55 VM_BUG_ON(atomic_read(&page->_count) != 0);
56 VM_BUG_ON(page_mapcount(page) < 0);
57 if (get_page_head)
58 atomic_inc(&page->first_page->_count);
59 atomic_inc(&page->_mapcount);
60}
61
62/*
63 * This is meant to be called as the FOLL_GET operation of
64 * follow_page() and it must be called while holding the proper PT
65 * lock while the pte (or pmd_trans_huge) is still mapping the page.
66 */
67static inline void get_page_foll(struct page *page)
68{
69 if (unlikely(PageTail(page)))
70 /*
71 * This is safe only because
72 * __split_huge_page_refcount() can't run under
73 * get_page_foll() because we hold the proper PT lock.
74 */
75 __get_page_tail_foll(page, true);
76 else {
77 /*
78 * Getting a normal page or the head of a compound page
79 * requires to already have an elevated page->_count.
80 */
81 VM_BUG_ON(atomic_read(&page->_count) <= 0);
82 atomic_inc(&page->_count);
83 }
84}
85
Hugh Dickins03f64622009-09-21 17:03:35 -070086extern unsigned long highest_memmap_pfn;
87
Lee Schermerhorn894bc312008-10-18 20:26:39 -070088/*
89 * in mm/vmscan.c:
90 */
Nick Piggin62695a82008-10-18 20:26:09 -070091extern int isolate_lru_page(struct page *page);
Lee Schermerhorn894bc312008-10-18 20:26:39 -070092extern void putback_lru_page(struct page *page);
Nick Piggin62695a82008-10-18 20:26:09 -070093
Lee Schermerhorn894bc312008-10-18 20:26:39 -070094/*
95 * in mm/page_alloc.c
96 */
Yasunori Goto0c0a4a52008-04-28 02:13:34 -070097extern void __free_pages_bootmem(struct page *page, unsigned int order);
Wu Fengguang20a03072009-06-16 15:32:22 -070098extern void prep_compound_page(struct page *page, unsigned long order);
Wu Fengguang8d22ba12009-12-16 12:19:58 +010099#ifdef CONFIG_MEMORY_FAILURE
100extern bool is_free_buddy_page(struct page *page);
101#endif
Wu Fengguang20a03072009-06-16 15:32:22 -0700102
Michal Nazarewicz02ff1de2011-12-29 13:09:50 +0100103#if defined CONFIG_COMPACTION || defined CONFIG_CMA
104
105/*
106 * in mm/compaction.c
107 */
108/*
109 * compact_control is used to track pages being migrated and the free pages
110 * they are being migrated to during memory compaction. The free_pfn starts
111 * at the end of a zone and migrate_pfn begins at the start. Movable pages
112 * are moved to the end of a zone during a compaction run and the run
113 * completes when free_pfn <= migrate_pfn
114 */
115struct compact_control {
116 struct list_head freepages; /* List of free pages to migrate to */
117 struct list_head migratepages; /* List of pages being migrated */
118 unsigned long nr_freepages; /* Number of isolated free pages */
119 unsigned long nr_migratepages; /* Number of pages to migrate */
120 unsigned long free_pfn; /* isolate_freepages search base */
121 unsigned long migrate_pfn; /* isolate_migratepages search base */
122 bool sync; /* Synchronous migration */
123
124 int order; /* order a direct compactor needs */
125 int migratetype; /* MOVABLE, RECLAIMABLE etc */
126 struct zone *zone;
127};
128
129unsigned long
130isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn);
131unsigned long
132isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
133 unsigned long low_pfn, unsigned long end_pfn);
134
135#endif
Nick Piggin0f8053a2006-03-22 00:08:33 -0800136
Mel Gorman48f13bf2007-10-16 01:26:10 -0700137/*
138 * function for dealing with page's order in buddy system.
139 * zone->lock is already acquired when we use these.
140 * So, we don't need atomic page->flags operations here.
141 */
142static inline unsigned long page_order(struct page *page)
143{
KAMEZAWA Hiroyuki572438f2010-10-26 14:22:08 -0700144 /* PageBuddy() must be checked by the caller */
Mel Gorman48f13bf2007-10-16 01:26:10 -0700145 return page_private(page);
146}
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800147
Namhyung Kim6038def2011-05-24 17:11:22 -0700148/* mm/util.c */
149void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
150 struct vm_area_struct *prev, struct rb_node *rb_parent);
151
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800152#ifdef CONFIG_MMU
153extern long mlock_vma_pages_range(struct vm_area_struct *vma,
154 unsigned long start, unsigned long end);
155extern void munlock_vma_pages_range(struct vm_area_struct *vma,
156 unsigned long start, unsigned long end);
157static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
158{
159 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
160}
161
Nick Pigginb291f002008-10-18 20:26:44 -0700162/*
163 * Called only in fault path via page_evictable() for a new page
164 * to determine if it's being mapped into a LOCKED vma.
165 * If so, mark page as mlocked.
166 */
167static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
168{
169 VM_BUG_ON(PageLRU(page));
170
171 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
172 return 0;
173
Nick Piggin5344b7e2008-10-18 20:26:51 -0700174 if (!TestSetPageMlocked(page)) {
175 inc_zone_page_state(page, NR_MLOCK);
176 count_vm_event(UNEVICTABLE_PGMLOCKED);
177 }
Nick Pigginb291f002008-10-18 20:26:44 -0700178 return 1;
179}
180
181/*
Hugh Dickins73848b42009-12-14 17:59:22 -0800182 * must be called with vma's mmap_sem held for read or write, and page locked.
Nick Pigginb291f002008-10-18 20:26:44 -0700183 */
184extern void mlock_vma_page(struct page *page);
Hugh Dickins73848b42009-12-14 17:59:22 -0800185extern void munlock_vma_page(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700186
187/*
188 * Clear the page's PageMlocked(). This can be useful in a situation where
189 * we want to unconditionally remove a page from the pagecache -- e.g.,
190 * on truncation or freeing.
191 *
192 * It is legal to call this function for any page, mlocked or not.
193 * If called for a page that is still mapped by mlocked vmas, all we do
194 * is revert to lazy LRU behaviour -- semantics are not broken.
195 */
196extern void __clear_page_mlock(struct page *page);
197static inline void clear_page_mlock(struct page *page)
198{
199 if (unlikely(TestClearPageMlocked(page)))
200 __clear_page_mlock(page);
201}
202
203/*
204 * mlock_migrate_page - called only from migrate_page_copy() to
Nick Piggin5344b7e2008-10-18 20:26:51 -0700205 * migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700206 */
207static inline void mlock_migrate_page(struct page *newpage, struct page *page)
208{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700209 if (TestClearPageMlocked(page)) {
210 unsigned long flags;
211
212 local_irq_save(flags);
213 __dec_zone_page_state(page, NR_MLOCK);
Nick Pigginb291f002008-10-18 20:26:44 -0700214 SetPageMlocked(newpage);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700215 __inc_zone_page_state(newpage, NR_MLOCK);
216 local_irq_restore(flags);
217 }
Nick Pigginb291f002008-10-18 20:26:44 -0700218}
219
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800220#ifdef CONFIG_TRANSPARENT_HUGEPAGE
221extern unsigned long vma_address(struct page *page,
222 struct vm_area_struct *vma);
223#endif
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800224#else /* !CONFIG_MMU */
Nick Pigginb291f002008-10-18 20:26:44 -0700225static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
226{
227 return 0;
228}
229static inline void clear_page_mlock(struct page *page) { }
230static inline void mlock_vma_page(struct page *page) { }
231static inline void mlock_migrate_page(struct page *new, struct page *old) { }
232
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800233#endif /* !CONFIG_MMU */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700234
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800235/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800236 * Return the mem_map entry representing the 'offset' subpage within
237 * the maximally aligned gigantic page 'base'. Handle any discontiguity
238 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
239 */
240static inline struct page *mem_map_offset(struct page *base, int offset)
241{
242 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
243 return pfn_to_page(page_to_pfn(base) + offset);
244 return base + offset;
245}
246
247/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300248 * Iterator over all subpages within the maximally aligned gigantic
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800249 * page 'base'. Handle any discontiguity in the mem_map.
250 */
251static inline struct page *mem_map_next(struct page *iter,
252 struct page *base, int offset)
253{
254 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
255 unsigned long pfn = page_to_pfn(base) + offset;
256 if (!pfn_valid(pfn))
257 return NULL;
258 return pfn_to_page(pfn);
259 }
260 return iter + 1;
261}
262
263/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800264 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
265 * so all functions starting at paging_init should be marked __init
266 * in those cases. SPARSEMEM, however, allows for memory hotplug,
267 * and alloc_bootmem_node is not used.
268 */
269#ifdef CONFIG_SPARSEMEM
270#define __paginginit __meminit
271#else
272#define __paginginit __init
273#endif
274
Mel Gorman6b74ab92008-07-23 21:26:49 -0700275/* Memory initialisation debug and verification */
276enum mminit_level {
277 MMINIT_WARNING,
278 MMINIT_VERIFY,
279 MMINIT_TRACE
280};
281
282#ifdef CONFIG_DEBUG_MEMORY_INIT
283
284extern int mminit_loglevel;
285
286#define mminit_dprintk(level, prefix, fmt, arg...) \
287do { \
288 if (level < mminit_loglevel) { \
289 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
290 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
291 } \
292} while (0)
293
Mel Gorman708614e2008-07-23 21:26:51 -0700294extern void mminit_verify_pageflags_layout(void);
295extern void mminit_verify_page_links(struct page *page,
296 enum zone_type zone, unsigned long nid, unsigned long pfn);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700297extern void mminit_verify_zonelist(void);
Mel Gorman708614e2008-07-23 21:26:51 -0700298
Mel Gorman6b74ab92008-07-23 21:26:49 -0700299#else
300
301static inline void mminit_dprintk(enum mminit_level level,
302 const char *prefix, const char *fmt, ...)
303{
304}
305
Mel Gorman708614e2008-07-23 21:26:51 -0700306static inline void mminit_verify_pageflags_layout(void)
307{
308}
309
310static inline void mminit_verify_page_links(struct page *page,
311 enum zone_type zone, unsigned long nid, unsigned long pfn)
312{
313}
Mel Gorman68ad8df2008-07-23 21:26:52 -0700314
315static inline void mminit_verify_zonelist(void)
316{
317}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700318#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700319
320/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
321#if defined(CONFIG_SPARSEMEM)
322extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
323 unsigned long *end_pfn);
324#else
325static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
326 unsigned long *end_pfn)
327{
328}
329#endif /* CONFIG_SPARSEMEM */
330
Mel Gormanfa5e0842009-06-16 15:33:22 -0700331#define ZONE_RECLAIM_NOSCAN -2
332#define ZONE_RECLAIM_FULL -1
333#define ZONE_RECLAIM_SOME 0
334#define ZONE_RECLAIM_SUCCESS 1
Nick Piggin0f8053a2006-03-22 00:08:33 -0800335#endif
Wu Fengguang7c116f22009-12-16 12:19:59 +0100336
Wu Fengguang31d3d342009-12-16 12:19:59 +0100337extern int hwpoison_filter(struct page *p);
338
Wu Fengguang7c116f22009-12-16 12:19:59 +0100339extern u32 hwpoison_filter_dev_major;
340extern u32 hwpoison_filter_dev_minor;
Wu Fengguang478c5ff2009-12-16 12:19:59 +0100341extern u64 hwpoison_filter_flags_mask;
342extern u64 hwpoison_filter_flags_value;
Andi Kleen4fd466e2009-12-16 12:19:59 +0100343extern u64 hwpoison_filter_memcg;
Haicheng Li1bfe5fe2009-12-16 12:19:59 +0100344extern u32 hwpoison_filter_enable;