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 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 */ 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 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 #ifdef CONFIG_SMP 43 extern int putback_active_lru_page(struct zone *zone, struct page *page); 44 #else 45 static inline int putback_active_lru_page(struct zone *zone, struct page *page) 46 { 47 return 0; 48 } 49 #endif 50 51 /* 52 * in mm/vmscan.c: 53 */ 54 extern int isolate_lru_page(struct page *page); 55 extern void putback_lru_page(struct page *page); 56 57 /* 58 * in mm/page_alloc.c 59 */ 60 extern void __free_pages_bootmem(struct page *page, unsigned int order); 61 extern void prep_compound_page(struct page *page, unsigned long order); 62 #ifdef CONFIG_MEMORY_FAILURE 63 extern bool is_free_buddy_page(struct page *page); 64 #endif 65 66 67 /* 68 * function for dealing with page's order in buddy system. 69 * zone->lock is already acquired when we use these. 70 * So, we don't need atomic page->flags operations here. 71 */ 72 static inline unsigned long page_order(struct page *page) 73 { 74 /* PageBuddy() must be checked by the caller */ 75 return page_private(page); 76 } 77 78 #ifdef CONFIG_MMU 79 extern long mlock_vma_pages_range(struct vm_area_struct *vma, 80 unsigned long start, unsigned long end); 81 extern void munlock_vma_pages_range(struct vm_area_struct *vma, 82 unsigned long start, unsigned long end); 83 static inline void munlock_vma_pages_all(struct vm_area_struct *vma) 84 { 85 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); 86 } 87 88 /* 89 * Called only in fault path via page_evictable() for a new page 90 * to determine if it's being mapped into a LOCKED vma. 91 * If so, mark page as mlocked. 92 */ 93 static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page) 94 { 95 VM_BUG_ON(PageLRU(page)); 96 97 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) 98 return 0; 99 100 if (!TestSetPageMlocked(page)) { 101 inc_zone_page_state(page, NR_MLOCK); 102 count_vm_event(UNEVICTABLE_PGMLOCKED); 103 } 104 return 1; 105 } 106 107 /* 108 * must be called with vma's mmap_sem held for read or write, and page locked. 109 */ 110 extern void mlock_vma_page(struct page *page); 111 extern void munlock_vma_page(struct page *page); 112 113 /* 114 * Clear the page's PageMlocked(). This can be useful in a situation where 115 * we want to unconditionally remove a page from the pagecache -- e.g., 116 * on truncation or freeing. 117 * 118 * It is legal to call this function for any page, mlocked or not. 119 * If called for a page that is still mapped by mlocked vmas, all we do 120 * is revert to lazy LRU behaviour -- semantics are not broken. 121 */ 122 extern void __clear_page_mlock(struct page *page); 123 static inline void clear_page_mlock(struct page *page) 124 { 125 if (unlikely(TestClearPageMlocked(page))) 126 __clear_page_mlock(page); 127 } 128 129 /* 130 * mlock_migrate_page - called only from migrate_page_copy() to 131 * migrate the Mlocked page flag; update statistics. 132 */ 133 static inline void mlock_migrate_page(struct page *newpage, struct page *page) 134 { 135 if (TestClearPageMlocked(page)) { 136 unsigned long flags; 137 138 local_irq_save(flags); 139 __dec_zone_page_state(page, NR_MLOCK); 140 SetPageMlocked(newpage); 141 __inc_zone_page_state(newpage, NR_MLOCK); 142 local_irq_restore(flags); 143 } 144 } 145 146 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 147 extern unsigned long vma_address(struct page *page, 148 struct vm_area_struct *vma); 149 #endif 150 #else /* !CONFIG_MMU */ 151 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) 152 { 153 return 0; 154 } 155 static inline void clear_page_mlock(struct page *page) { } 156 static inline void mlock_vma_page(struct page *page) { } 157 static inline void mlock_migrate_page(struct page *new, struct page *old) { } 158 159 #endif /* !CONFIG_MMU */ 160 161 /* 162 * Return the mem_map entry representing the 'offset' subpage within 163 * the maximally aligned gigantic page 'base'. Handle any discontiguity 164 * in the mem_map at MAX_ORDER_NR_PAGES boundaries. 165 */ 166 static inline struct page *mem_map_offset(struct page *base, int offset) 167 { 168 if (unlikely(offset >= MAX_ORDER_NR_PAGES)) 169 return pfn_to_page(page_to_pfn(base) + offset); 170 return base + offset; 171 } 172 173 /* 174 * Iterator over all subpages withing the maximally aligned gigantic 175 * page 'base'. Handle any discontiguity in the mem_map. 176 */ 177 static inline struct page *mem_map_next(struct page *iter, 178 struct page *base, int offset) 179 { 180 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { 181 unsigned long pfn = page_to_pfn(base) + offset; 182 if (!pfn_valid(pfn)) 183 return NULL; 184 return pfn_to_page(pfn); 185 } 186 return iter + 1; 187 } 188 189 /* 190 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, 191 * so all functions starting at paging_init should be marked __init 192 * in those cases. SPARSEMEM, however, allows for memory hotplug, 193 * and alloc_bootmem_node is not used. 194 */ 195 #ifdef CONFIG_SPARSEMEM 196 #define __paginginit __meminit 197 #else 198 #define __paginginit __init 199 #endif 200 201 /* Memory initialisation debug and verification */ 202 enum mminit_level { 203 MMINIT_WARNING, 204 MMINIT_VERIFY, 205 MMINIT_TRACE 206 }; 207 208 #ifdef CONFIG_DEBUG_MEMORY_INIT 209 210 extern int mminit_loglevel; 211 212 #define mminit_dprintk(level, prefix, fmt, arg...) \ 213 do { \ 214 if (level < mminit_loglevel) { \ 215 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ 216 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ 217 } \ 218 } while (0) 219 220 extern void mminit_verify_pageflags_layout(void); 221 extern void mminit_verify_page_links(struct page *page, 222 enum zone_type zone, unsigned long nid, unsigned long pfn); 223 extern void mminit_verify_zonelist(void); 224 225 #else 226 227 static inline void mminit_dprintk(enum mminit_level level, 228 const char *prefix, const char *fmt, ...) 229 { 230 } 231 232 static inline void mminit_verify_pageflags_layout(void) 233 { 234 } 235 236 static inline void mminit_verify_page_links(struct page *page, 237 enum zone_type zone, unsigned long nid, unsigned long pfn) 238 { 239 } 240 241 static inline void mminit_verify_zonelist(void) 242 { 243 } 244 #endif /* CONFIG_DEBUG_MEMORY_INIT */ 245 246 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ 247 #if defined(CONFIG_SPARSEMEM) 248 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, 249 unsigned long *end_pfn); 250 #else 251 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, 252 unsigned long *end_pfn) 253 { 254 } 255 #endif /* CONFIG_SPARSEMEM */ 256 257 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, 258 unsigned long start, int len, unsigned int foll_flags, 259 struct page **pages, struct vm_area_struct **vmas, 260 int *nonblocking); 261 262 #define ZONE_RECLAIM_NOSCAN -2 263 #define ZONE_RECLAIM_FULL -1 264 #define ZONE_RECLAIM_SOME 0 265 #define ZONE_RECLAIM_SUCCESS 1 266 #endif 267 268 extern int hwpoison_filter(struct page *p); 269 270 extern u32 hwpoison_filter_dev_major; 271 extern u32 hwpoison_filter_dev_minor; 272 extern u64 hwpoison_filter_flags_mask; 273 extern u64 hwpoison_filter_flags_value; 274 extern u64 hwpoison_filter_memcg; 275 extern u32 hwpoison_filter_enable; 276