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 /* 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 */ 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); 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 */ 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); 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 */ 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 #else /* !CONFIG_MMU */ 138 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) 139 { 140 return 0; 141 } 142 static inline void clear_page_mlock(struct page *page) { } 143 static inline void mlock_vma_page(struct page *page) { } 144 static inline void mlock_migrate_page(struct page *new, struct page *old) { } 145 146 #endif /* !CONFIG_MMU */ 147 148 /* 149 * Return the mem_map entry representing the 'offset' subpage within 150 * the maximally aligned gigantic page 'base'. Handle any discontiguity 151 * in the mem_map at MAX_ORDER_NR_PAGES boundaries. 152 */ 153 static inline struct page *mem_map_offset(struct page *base, int offset) 154 { 155 if (unlikely(offset >= MAX_ORDER_NR_PAGES)) 156 return pfn_to_page(page_to_pfn(base) + offset); 157 return base + offset; 158 } 159 160 /* 161 * Iterator over all subpages withing the maximally aligned gigantic 162 * page 'base'. Handle any discontiguity in the mem_map. 163 */ 164 static inline struct page *mem_map_next(struct page *iter, 165 struct page *base, int offset) 166 { 167 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { 168 unsigned long pfn = page_to_pfn(base) + offset; 169 if (!pfn_valid(pfn)) 170 return NULL; 171 return pfn_to_page(pfn); 172 } 173 return iter + 1; 174 } 175 176 /* 177 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, 178 * so all functions starting at paging_init should be marked __init 179 * in those cases. SPARSEMEM, however, allows for memory hotplug, 180 * and alloc_bootmem_node is not used. 181 */ 182 #ifdef CONFIG_SPARSEMEM 183 #define __paginginit __meminit 184 #else 185 #define __paginginit __init 186 #endif 187 188 /* Memory initialisation debug and verification */ 189 enum mminit_level { 190 MMINIT_WARNING, 191 MMINIT_VERIFY, 192 MMINIT_TRACE 193 }; 194 195 #ifdef CONFIG_DEBUG_MEMORY_INIT 196 197 extern int mminit_loglevel; 198 199 #define mminit_dprintk(level, prefix, fmt, arg...) \ 200 do { \ 201 if (level < mminit_loglevel) { \ 202 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ 203 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ 204 } \ 205 } while (0) 206 207 extern void mminit_verify_pageflags_layout(void); 208 extern void mminit_verify_page_links(struct page *page, 209 enum zone_type zone, unsigned long nid, unsigned long pfn); 210 extern void mminit_verify_zonelist(void); 211 212 #else 213 214 static inline void mminit_dprintk(enum mminit_level level, 215 const char *prefix, const char *fmt, ...) 216 { 217 } 218 219 static inline void mminit_verify_pageflags_layout(void) 220 { 221 } 222 223 static inline void mminit_verify_page_links(struct page *page, 224 enum zone_type zone, unsigned long nid, unsigned long pfn) 225 { 226 } 227 228 static inline void mminit_verify_zonelist(void) 229 { 230 } 231 #endif /* CONFIG_DEBUG_MEMORY_INIT */ 232 233 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ 234 #if defined(CONFIG_SPARSEMEM) 235 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, 236 unsigned long *end_pfn); 237 #else 238 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, 239 unsigned long *end_pfn) 240 { 241 } 242 #endif /* CONFIG_SPARSEMEM */ 243 244 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, 245 unsigned long start, int len, unsigned int foll_flags, 246 struct page **pages, struct vm_area_struct **vmas); 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