| /* internal.h: mm/ internal definitions |
| * |
| * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #ifndef __MM_INTERNAL_H |
| #define __MM_INTERNAL_H |
| |
| #include <linux/mm.h> |
| |
| void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
| unsigned long floor, unsigned long ceiling); |
| |
| static inline void set_page_count(struct page *page, int v) |
| { |
| atomic_set(&page->_count, v); |
| } |
| |
| /* |
| * Turn a non-refcounted page (->_count == 0) into refcounted with |
| * a count of one. |
| */ |
| static inline void set_page_refcounted(struct page *page) |
| { |
| VM_BUG_ON(PageTail(page)); |
| VM_BUG_ON(atomic_read(&page->_count)); |
| set_page_count(page, 1); |
| } |
| |
| static inline void __put_page(struct page *page) |
| { |
| atomic_dec(&page->_count); |
| } |
| |
| static inline void __get_page_tail_foll(struct page *page, |
| bool get_page_head) |
| { |
| /* |
| * If we're getting a tail page, the elevated page->_count is |
| * required only in the head page and we will elevate the head |
| * page->_count and tail page->_mapcount. |
| * |
| * We elevate page_tail->_mapcount for tail pages to force |
| * page_tail->_count to be zero at all times to avoid getting |
| * false positives from get_page_unless_zero() with |
| * speculative page access (like in |
| * page_cache_get_speculative()) on tail pages. |
| */ |
| VM_BUG_ON(atomic_read(&page->first_page->_count) <= 0); |
| VM_BUG_ON(atomic_read(&page->_count) != 0); |
| VM_BUG_ON(page_mapcount(page) < 0); |
| if (get_page_head) |
| atomic_inc(&page->first_page->_count); |
| atomic_inc(&page->_mapcount); |
| } |
| |
| /* |
| * This is meant to be called as the FOLL_GET operation of |
| * follow_page() and it must be called while holding the proper PT |
| * lock while the pte (or pmd_trans_huge) is still mapping the page. |
| */ |
| static inline void get_page_foll(struct page *page) |
| { |
| if (unlikely(PageTail(page))) |
| /* |
| * This is safe only because |
| * __split_huge_page_refcount() can't run under |
| * get_page_foll() because we hold the proper PT lock. |
| */ |
| __get_page_tail_foll(page, true); |
| else { |
| /* |
| * Getting a normal page or the head of a compound page |
| * requires to already have an elevated page->_count. |
| */ |
| VM_BUG_ON(atomic_read(&page->_count) <= 0); |
| atomic_inc(&page->_count); |
| } |
| } |
| |
| extern unsigned long highest_memmap_pfn; |
| |
| /* |
| * in mm/vmscan.c: |
| */ |
| extern int isolate_lru_page(struct page *page); |
| extern void putback_lru_page(struct page *page); |
| |
| /* |
| * in mm/page_alloc.c |
| */ |
| extern void __free_pages_bootmem(struct page *page, unsigned int order); |
| extern void prep_compound_page(struct page *page, unsigned long order); |
| #ifdef CONFIG_MEMORY_FAILURE |
| extern bool is_free_buddy_page(struct page *page); |
| #endif |
| |
| #if defined CONFIG_COMPACTION || defined CONFIG_CMA |
| |
| /* |
| * in mm/compaction.c |
| */ |
| /* |
| * compact_control is used to track pages being migrated and the free pages |
| * they are being migrated to during memory compaction. The free_pfn starts |
| * at the end of a zone and migrate_pfn begins at the start. Movable pages |
| * are moved to the end of a zone during a compaction run and the run |
| * completes when free_pfn <= migrate_pfn |
| */ |
| struct compact_control { |
| struct list_head freepages; /* List of free pages to migrate to */ |
| struct list_head migratepages; /* List of pages being migrated */ |
| unsigned long nr_freepages; /* Number of isolated free pages */ |
| unsigned long nr_migratepages; /* Number of pages to migrate */ |
| unsigned long free_pfn; /* isolate_freepages search base */ |
| unsigned long migrate_pfn; /* isolate_migratepages search base */ |
| bool sync; /* Synchronous migration */ |
| |
| int order; /* order a direct compactor needs */ |
| int migratetype; /* MOVABLE, RECLAIMABLE etc */ |
| struct zone *zone; |
| bool *contended; /* True if a lock was contended */ |
| struct page **page; /* Page captured of requested size */ |
| }; |
| |
| unsigned long |
| isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn); |
| unsigned long |
| isolate_migratepages_range(struct zone *zone, struct compact_control *cc, |
| unsigned long low_pfn, unsigned long end_pfn); |
| |
| #endif |
| |
| /* |
| * function for dealing with page's order in buddy system. |
| * zone->lock is already acquired when we use these. |
| * So, we don't need atomic page->flags operations here. |
| */ |
| static inline unsigned long page_order(struct page *page) |
| { |
| /* PageBuddy() must be checked by the caller */ |
| return page_private(page); |
| } |
| |
| /* mm/util.c */ |
| void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, |
| struct vm_area_struct *prev, struct rb_node *rb_parent); |
| |
| #ifdef CONFIG_MMU |
| extern long mlock_vma_pages_range(struct vm_area_struct *vma, |
| unsigned long start, unsigned long end); |
| extern void munlock_vma_pages_range(struct vm_area_struct *vma, |
| unsigned long start, unsigned long end); |
| static inline void munlock_vma_pages_all(struct vm_area_struct *vma) |
| { |
| munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); |
| } |
| |
| /* |
| * Called only in fault path via page_evictable() for a new page |
| * to determine if it's being mapped into a LOCKED vma. |
| * If so, mark page as mlocked. |
| */ |
| static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page) |
| { |
| VM_BUG_ON(PageLRU(page)); |
| |
| if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) |
| return 0; |
| |
| if (!TestSetPageMlocked(page)) { |
| inc_zone_page_state(page, NR_MLOCK); |
| count_vm_event(UNEVICTABLE_PGMLOCKED); |
| } |
| return 1; |
| } |
| |
| /* |
| * must be called with vma's mmap_sem held for read or write, and page locked. |
| */ |
| extern void mlock_vma_page(struct page *page); |
| extern void munlock_vma_page(struct page *page); |
| |
| /* |
| * Clear the page's PageMlocked(). This can be useful in a situation where |
| * we want to unconditionally remove a page from the pagecache -- e.g., |
| * on truncation or freeing. |
| * |
| * It is legal to call this function for any page, mlocked or not. |
| * If called for a page that is still mapped by mlocked vmas, all we do |
| * is revert to lazy LRU behaviour -- semantics are not broken. |
| */ |
| extern void __clear_page_mlock(struct page *page); |
| static inline void clear_page_mlock(struct page *page) |
| { |
| if (unlikely(TestClearPageMlocked(page))) |
| __clear_page_mlock(page); |
| } |
| |
| /* |
| * mlock_migrate_page - called only from migrate_page_copy() to |
| * migrate the Mlocked page flag; update statistics. |
| */ |
| static inline void mlock_migrate_page(struct page *newpage, struct page *page) |
| { |
| if (TestClearPageMlocked(page)) { |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| __dec_zone_page_state(page, NR_MLOCK); |
| SetPageMlocked(newpage); |
| __inc_zone_page_state(newpage, NR_MLOCK); |
| local_irq_restore(flags); |
| } |
| } |
| |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| extern unsigned long vma_address(struct page *page, |
| struct vm_area_struct *vma); |
| #endif |
| #else /* !CONFIG_MMU */ |
| static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) |
| { |
| return 0; |
| } |
| static inline void clear_page_mlock(struct page *page) { } |
| static inline void mlock_vma_page(struct page *page) { } |
| static inline void mlock_migrate_page(struct page *new, struct page *old) { } |
| |
| #endif /* !CONFIG_MMU */ |
| |
| /* |
| * Return the mem_map entry representing the 'offset' subpage within |
| * the maximally aligned gigantic page 'base'. Handle any discontiguity |
| * in the mem_map at MAX_ORDER_NR_PAGES boundaries. |
| */ |
| static inline struct page *mem_map_offset(struct page *base, int offset) |
| { |
| if (unlikely(offset >= MAX_ORDER_NR_PAGES)) |
| return pfn_to_page(page_to_pfn(base) + offset); |
| return base + offset; |
| } |
| |
| /* |
| * Iterator over all subpages within the maximally aligned gigantic |
| * page 'base'. Handle any discontiguity in the mem_map. |
| */ |
| static inline struct page *mem_map_next(struct page *iter, |
| struct page *base, int offset) |
| { |
| if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { |
| unsigned long pfn = page_to_pfn(base) + offset; |
| if (!pfn_valid(pfn)) |
| return NULL; |
| return pfn_to_page(pfn); |
| } |
| return iter + 1; |
| } |
| |
| /* |
| * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, |
| * so all functions starting at paging_init should be marked __init |
| * in those cases. SPARSEMEM, however, allows for memory hotplug, |
| * and alloc_bootmem_node is not used. |
| */ |
| #ifdef CONFIG_SPARSEMEM |
| #define __paginginit __meminit |
| #else |
| #define __paginginit __init |
| #endif |
| |
| /* Memory initialisation debug and verification */ |
| enum mminit_level { |
| MMINIT_WARNING, |
| MMINIT_VERIFY, |
| MMINIT_TRACE |
| }; |
| |
| #ifdef CONFIG_DEBUG_MEMORY_INIT |
| |
| extern int mminit_loglevel; |
| |
| #define mminit_dprintk(level, prefix, fmt, arg...) \ |
| do { \ |
| if (level < mminit_loglevel) { \ |
| printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ |
| printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ |
| } \ |
| } while (0) |
| |
| extern void mminit_verify_pageflags_layout(void); |
| extern void mminit_verify_page_links(struct page *page, |
| enum zone_type zone, unsigned long nid, unsigned long pfn); |
| extern void mminit_verify_zonelist(void); |
| |
| #else |
| |
| static inline void mminit_dprintk(enum mminit_level level, |
| const char *prefix, const char *fmt, ...) |
| { |
| } |
| |
| static inline void mminit_verify_pageflags_layout(void) |
| { |
| } |
| |
| static inline void mminit_verify_page_links(struct page *page, |
| enum zone_type zone, unsigned long nid, unsigned long pfn) |
| { |
| } |
| |
| static inline void mminit_verify_zonelist(void) |
| { |
| } |
| #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
| |
| /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ |
| #if defined(CONFIG_SPARSEMEM) |
| extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, |
| unsigned long *end_pfn); |
| #else |
| static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, |
| unsigned long *end_pfn) |
| { |
| } |
| #endif /* CONFIG_SPARSEMEM */ |
| |
| #define ZONE_RECLAIM_NOSCAN -2 |
| #define ZONE_RECLAIM_FULL -1 |
| #define ZONE_RECLAIM_SOME 0 |
| #define ZONE_RECLAIM_SUCCESS 1 |
| #endif |
| |
| extern int hwpoison_filter(struct page *p); |
| |
| extern u32 hwpoison_filter_dev_major; |
| extern u32 hwpoison_filter_dev_minor; |
| extern u64 hwpoison_filter_flags_mask; |
| extern u64 hwpoison_filter_flags_value; |
| extern u64 hwpoison_filter_memcg; |
| extern u32 hwpoison_filter_enable; |
| |
| /* The ALLOC_WMARK bits are used as an index to zone->watermark */ |
| #define ALLOC_WMARK_MIN WMARK_MIN |
| #define ALLOC_WMARK_LOW WMARK_LOW |
| #define ALLOC_WMARK_HIGH WMARK_HIGH |
| #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */ |
| |
| /* Mask to get the watermark bits */ |
| #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1) |
| |
| #define ALLOC_HARDER 0x10 /* try to alloc harder */ |
| #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ |
| #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ |
| #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */ |
| |
| unsigned long reclaim_clean_pages_from_list(struct zone *zone, |
| struct list_head *page_list); |