1 /* internal.h: mm/ internal definitions
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11 #ifndef __MM_INTERNAL_H
12 #define __MM_INTERNAL_H
13
14 #include <linux/mm.h>
15
16 void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
17 unsigned long floor, unsigned long ceiling);
18
set_page_count(struct page * page,int v)19 static inline void set_page_count(struct page *page, int v)
20 {
21 atomic_set(&page->_count, v);
22 }
23
24 /*
25 * Turn a non-refcounted page (->_count == 0) into refcounted with
26 * a count of one.
27 */
set_page_refcounted(struct page * page)28 static inline void set_page_refcounted(struct page *page)
29 {
30 VM_BUG_ON(PageTail(page));
31 VM_BUG_ON(atomic_read(&page->_count));
32 set_page_count(page, 1);
33 }
34
__put_page(struct page * page)35 static inline void __put_page(struct page *page)
36 {
37 atomic_dec(&page->_count);
38 }
39
40 extern unsigned long highest_memmap_pfn;
41
42 /*
43 * in mm/vmscan.c:
44 */
45 extern int isolate_lru_page(struct page *page);
46 extern void putback_lru_page(struct page *page);
47
48 /*
49 * in mm/page_alloc.c
50 */
51 extern void __free_pages_bootmem(struct page *page, unsigned int order);
52 extern void prep_compound_page(struct page *page, unsigned long order);
53 #ifdef CONFIG_MEMORY_FAILURE
54 extern bool is_free_buddy_page(struct page *page);
55 #endif
56
57
58 /*
59 * function for dealing with page's order in buddy system.
60 * zone->lock is already acquired when we use these.
61 * So, we don't need atomic page->flags operations here.
62 */
page_order(struct page * page)63 static inline unsigned long page_order(struct page *page)
64 {
65 /* PageBuddy() must be checked by the caller */
66 return page_private(page);
67 }
68
69 #ifdef CONFIG_MMU
70 extern long mlock_vma_pages_range(struct vm_area_struct *vma,
71 unsigned long start, unsigned long end);
72 extern void munlock_vma_pages_range(struct vm_area_struct *vma,
73 unsigned long start, unsigned long end);
munlock_vma_pages_all(struct vm_area_struct * vma)74 static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
75 {
76 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
77 }
78
79 /*
80 * Called only in fault path via page_evictable() for a new page
81 * to determine if it's being mapped into a LOCKED vma.
82 * If so, mark page as mlocked.
83 */
is_mlocked_vma(struct vm_area_struct * vma,struct page * page)84 static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
85 {
86 VM_BUG_ON(PageLRU(page));
87
88 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
89 return 0;
90
91 if (!TestSetPageMlocked(page)) {
92 inc_zone_page_state(page, NR_MLOCK);
93 count_vm_event(UNEVICTABLE_PGMLOCKED);
94 }
95 return 1;
96 }
97
98 /*
99 * must be called with vma's mmap_sem held for read or write, and page locked.
100 */
101 extern void mlock_vma_page(struct page *page);
102 extern void munlock_vma_page(struct page *page);
103
104 /*
105 * Clear the page's PageMlocked(). This can be useful in a situation where
106 * we want to unconditionally remove a page from the pagecache -- e.g.,
107 * on truncation or freeing.
108 *
109 * It is legal to call this function for any page, mlocked or not.
110 * If called for a page that is still mapped by mlocked vmas, all we do
111 * is revert to lazy LRU behaviour -- semantics are not broken.
112 */
113 extern void __clear_page_mlock(struct page *page);
clear_page_mlock(struct page * page)114 static inline void clear_page_mlock(struct page *page)
115 {
116 if (unlikely(TestClearPageMlocked(page)))
117 __clear_page_mlock(page);
118 }
119
120 /*
121 * mlock_migrate_page - called only from migrate_page_copy() to
122 * migrate the Mlocked page flag; update statistics.
123 */
mlock_migrate_page(struct page * newpage,struct page * page)124 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
125 {
126 if (TestClearPageMlocked(page)) {
127 unsigned long flags;
128
129 local_irq_save(flags);
130 __dec_zone_page_state(page, NR_MLOCK);
131 SetPageMlocked(newpage);
132 __inc_zone_page_state(newpage, NR_MLOCK);
133 local_irq_restore(flags);
134 }
135 }
136
137 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
138 extern unsigned long vma_address(struct page *page,
139 struct vm_area_struct *vma);
140 #endif
141 #else /* !CONFIG_MMU */
is_mlocked_vma(struct vm_area_struct * v,struct page * p)142 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
143 {
144 return 0;
145 }
clear_page_mlock(struct page * page)146 static inline void clear_page_mlock(struct page *page) { }
mlock_vma_page(struct page * page)147 static inline void mlock_vma_page(struct page *page) { }
mlock_migrate_page(struct page * new,struct page * old)148 static inline void mlock_migrate_page(struct page *new, struct page *old) { }
149
150 #endif /* !CONFIG_MMU */
151
152 /*
153 * Return the mem_map entry representing the 'offset' subpage within
154 * the maximally aligned gigantic page 'base'. Handle any discontiguity
155 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
156 */
mem_map_offset(struct page * base,int offset)157 static inline struct page *mem_map_offset(struct page *base, int offset)
158 {
159 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
160 return pfn_to_page(page_to_pfn(base) + offset);
161 return base + offset;
162 }
163
164 /*
165 * Iterator over all subpages within the maximally aligned gigantic
166 * page 'base'. Handle any discontiguity in the mem_map.
167 */
mem_map_next(struct page * iter,struct page * base,int offset)168 static inline struct page *mem_map_next(struct page *iter,
169 struct page *base, int offset)
170 {
171 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
172 unsigned long pfn = page_to_pfn(base) + offset;
173 if (!pfn_valid(pfn))
174 return NULL;
175 return pfn_to_page(pfn);
176 }
177 return iter + 1;
178 }
179
180 /*
181 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
182 * so all functions starting at paging_init should be marked __init
183 * in those cases. SPARSEMEM, however, allows for memory hotplug,
184 * and alloc_bootmem_node is not used.
185 */
186 #ifdef CONFIG_SPARSEMEM
187 #define __paginginit __meminit
188 #else
189 #define __paginginit __init
190 #endif
191
192 /* Memory initialisation debug and verification */
193 enum mminit_level {
194 MMINIT_WARNING,
195 MMINIT_VERIFY,
196 MMINIT_TRACE
197 };
198
199 #ifdef CONFIG_DEBUG_MEMORY_INIT
200
201 extern int mminit_loglevel;
202
203 #define mminit_dprintk(level, prefix, fmt, arg...) \
204 do { \
205 if (level < mminit_loglevel) { \
206 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
207 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
208 } \
209 } while (0)
210
211 extern void mminit_verify_pageflags_layout(void);
212 extern void mminit_verify_page_links(struct page *page,
213 enum zone_type zone, unsigned long nid, unsigned long pfn);
214 extern void mminit_verify_zonelist(void);
215
216 #else
217
mminit_dprintk(enum mminit_level level,const char * prefix,const char * fmt,...)218 static inline void mminit_dprintk(enum mminit_level level,
219 const char *prefix, const char *fmt, ...)
220 {
221 }
222
mminit_verify_pageflags_layout(void)223 static inline void mminit_verify_pageflags_layout(void)
224 {
225 }
226
mminit_verify_page_links(struct page * page,enum zone_type zone,unsigned long nid,unsigned long pfn)227 static inline void mminit_verify_page_links(struct page *page,
228 enum zone_type zone, unsigned long nid, unsigned long pfn)
229 {
230 }
231
mminit_verify_zonelist(void)232 static inline void mminit_verify_zonelist(void)
233 {
234 }
235 #endif /* CONFIG_DEBUG_MEMORY_INIT */
236
237 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
238 #if defined(CONFIG_SPARSEMEM)
239 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
240 unsigned long *end_pfn);
241 #else
mminit_validate_memmodel_limits(unsigned long * start_pfn,unsigned long * end_pfn)242 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
243 unsigned long *end_pfn)
244 {
245 }
246 #endif /* CONFIG_SPARSEMEM */
247
248 #define ZONE_RECLAIM_NOSCAN -2
249 #define ZONE_RECLAIM_FULL -1
250 #define ZONE_RECLAIM_SOME 0
251 #define ZONE_RECLAIM_SUCCESS 1
252 #endif
253
254 extern int hwpoison_filter(struct page *p);
255
256 extern u32 hwpoison_filter_dev_major;
257 extern u32 hwpoison_filter_dev_minor;
258 extern u64 hwpoison_filter_flags_mask;
259 extern u64 hwpoison_filter_flags_value;
260 extern u64 hwpoison_filter_memcg;
261 extern u32 hwpoison_filter_enable;
262