| /* 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/fs.h> |
| #include <linux/mm.h> |
| #include <linux/pagemap.h> |
| #include <linux/tracepoint-defs.h> |
| |
| /* |
| * The set of flags that only affect watermark checking and reclaim |
| * behaviour. This is used by the MM to obey the caller constraints |
| * about IO, FS and watermark checking while ignoring placement |
| * hints such as HIGHMEM usage. |
| */ |
| #define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\ |
| __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ |
| __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC) |
| |
| /* The GFP flags allowed during early boot */ |
| #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS)) |
| |
| /* Control allocation cpuset and node placement constraints */ |
| #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) |
| |
| /* Do not use these with a slab allocator */ |
| #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) |
| |
| void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
| unsigned long floor, unsigned long ceiling); |
| |
| extern int __do_page_cache_readahead(struct address_space *mapping, |
| struct file *filp, pgoff_t offset, unsigned long nr_to_read, |
| unsigned long lookahead_size); |
| |
| /* |
| * Submit IO for the read-ahead request in file_ra_state. |
| */ |
| static inline unsigned long ra_submit(struct file_ra_state *ra, |
| struct address_space *mapping, struct file *filp) |
| { |
| return __do_page_cache_readahead(mapping, filp, |
| ra->start, ra->size, ra->async_size); |
| } |
| |
| /* |
| * 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_PAGE(PageTail(page), page); |
| VM_BUG_ON_PAGE(page_ref_count(page), page); |
| set_page_count(page, 1); |
| } |
| |
| 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); |
| extern bool zone_reclaimable(struct zone *zone); |
| |
| /* |
| * in mm/rmap.c: |
| */ |
| extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); |
| |
| /* |
| * in mm/page_alloc.c |
| */ |
| |
| /* |
| * Structure for holding the mostly immutable allocation parameters passed |
| * between functions involved in allocations, including the alloc_pages* |
| * family of functions. |
| * |
| * nodemask, migratetype and high_zoneidx are initialized only once in |
| * __alloc_pages_nodemask() and then never change. |
| * |
| * zonelist, preferred_zone and classzone_idx are set first in |
| * __alloc_pages_nodemask() for the fast path, and might be later changed |
| * in __alloc_pages_slowpath(). All other functions pass the whole strucure |
| * by a const pointer. |
| */ |
| struct alloc_context { |
| struct zonelist *zonelist; |
| nodemask_t *nodemask; |
| struct zone *preferred_zone; |
| int classzone_idx; |
| int migratetype; |
| enum zone_type high_zoneidx; |
| bool spread_dirty_pages; |
| }; |
| |
| /* |
| * Locate the struct page for both the matching buddy in our |
| * pair (buddy1) and the combined O(n+1) page they form (page). |
| * |
| * 1) Any buddy B1 will have an order O twin B2 which satisfies |
| * the following equation: |
| * B2 = B1 ^ (1 << O) |
| * For example, if the starting buddy (buddy2) is #8 its order |
| * 1 buddy is #10: |
| * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10 |
| * |
| * 2) Any buddy B will have an order O+1 parent P which |
| * satisfies the following equation: |
| * P = B & ~(1 << O) |
| * |
| * Assumption: *_mem_map is contiguous at least up to MAX_ORDER |
| */ |
| static inline unsigned long |
| __find_buddy_index(unsigned long page_idx, unsigned int order) |
| { |
| return page_idx ^ (1 << order); |
| } |
| |
| extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn, |
| unsigned long end_pfn, struct zone *zone); |
| |
| static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn, |
| unsigned long end_pfn, struct zone *zone) |
| { |
| if (zone->contiguous) |
| return pfn_to_page(start_pfn); |
| |
| return __pageblock_pfn_to_page(start_pfn, end_pfn, zone); |
| } |
| |
| extern int __isolate_free_page(struct page *page, unsigned int order); |
| extern void __free_pages_bootmem(struct page *page, unsigned long pfn, |
| unsigned int order); |
| extern void prep_compound_page(struct page *page, unsigned int order); |
| extern int user_min_free_kbytes; |
| |
| #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 */ |
| unsigned long last_migrated_pfn;/* Not yet flushed page being freed */ |
| enum migrate_mode mode; /* Async or sync migration mode */ |
| bool ignore_skip_hint; /* Scan blocks even if marked skip */ |
| bool direct_compaction; /* False from kcompactd or /proc/... */ |
| int order; /* order a direct compactor needs */ |
| const gfp_t gfp_mask; /* gfp mask of a direct compactor */ |
| const int alloc_flags; /* alloc flags of a direct compactor */ |
| const int classzone_idx; /* zone index of a direct compactor */ |
| struct zone *zone; |
| int contended; /* Signal need_sched() or lock |
| * contention detected during |
| * compaction |
| */ |
| }; |
| |
| unsigned long |
| isolate_freepages_range(struct compact_control *cc, |
| unsigned long start_pfn, unsigned long end_pfn); |
| unsigned long |
| isolate_migratepages_range(struct compact_control *cc, |
| unsigned long low_pfn, unsigned long end_pfn); |
| int find_suitable_fallback(struct free_area *area, unsigned int order, |
| int migratetype, bool only_stealable, bool *can_steal); |
| |
| #endif |
| |
| /* |
| * This function returns the order of a free page in the buddy system. In |
| * general, page_zone(page)->lock must be held by the caller to prevent the |
| * page from being allocated in parallel and returning garbage as the order. |
| * If a caller does not hold page_zone(page)->lock, it must guarantee that the |
| * page cannot be allocated or merged in parallel. Alternatively, it must |
| * handle invalid values gracefully, and use page_order_unsafe() below. |
| */ |
| static inline unsigned int page_order(struct page *page) |
| { |
| /* PageBuddy() must be checked by the caller */ |
| return page_private(page); |
| } |
| |
| /* |
| * Like page_order(), but for callers who cannot afford to hold the zone lock. |
| * PageBuddy() should be checked first by the caller to minimize race window, |
| * and invalid values must be handled gracefully. |
| * |
| * READ_ONCE is used so that if the caller assigns the result into a local |
| * variable and e.g. tests it for valid range before using, the compiler cannot |
| * decide to remove the variable and inline the page_private(page) multiple |
| * times, potentially observing different values in the tests and the actual |
| * use of the result. |
| */ |
| #define page_order_unsafe(page) READ_ONCE(page_private(page)) |
| |
| static inline bool is_cow_mapping(vm_flags_t flags) |
| { |
| return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; |
| } |
| |
| /* |
| * These three helpers classifies VMAs for virtual memory accounting. |
| */ |
| |
| /* |
| * Executable code area - executable, not writable, not stack |
| */ |
| static inline bool is_exec_mapping(vm_flags_t flags) |
| { |
| return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC; |
| } |
| |
| /* |
| * Stack area - atomatically grows in one direction |
| * |
| * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous: |
| * do_mmap() forbids all other combinations. |
| */ |
| static inline bool is_stack_mapping(vm_flags_t flags) |
| { |
| return (flags & VM_STACK) == VM_STACK; |
| } |
| |
| /* |
| * Data area - private, writable, not stack |
| */ |
| static inline bool is_data_mapping(vm_flags_t flags) |
| { |
| return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE; |
| } |
| |
| /* 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 populate_vma_page_range(struct vm_area_struct *vma, |
| unsigned long start, unsigned long end, int *nonblocking); |
| 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); |
| } |
| |
| /* |
| * 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 unsigned int 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); |
| |
| /* |
| * mlock_migrate_page - called only from migrate_misplaced_transhuge_page() |
| * (because that does not go through the full procedure of migration ptes): |
| * to migrate the Mlocked page flag; update statistics. |
| */ |
| static inline void mlock_migrate_page(struct page *newpage, struct page *page) |
| { |
| if (TestClearPageMlocked(page)) { |
| int nr_pages = hpage_nr_pages(page); |
| |
| /* Holding pmd lock, no change in irq context: __mod is safe */ |
| __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages); |
| SetPageMlocked(newpage); |
| __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages); |
| } |
| } |
| |
| extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); |
| |
| /* |
| * At what user virtual address is page expected in @vma? |
| */ |
| static inline unsigned long |
| __vma_address(struct page *page, struct vm_area_struct *vma) |
| { |
| pgoff_t pgoff = page_to_pgoff(page); |
| return vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); |
| } |
| |
| static inline unsigned long |
| vma_address(struct page *page, struct vm_area_struct *vma) |
| { |
| unsigned long address = __vma_address(page, vma); |
| |
| /* page should be within @vma mapping range */ |
| VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); |
| |
| return address; |
| } |
| |
| #else /* !CONFIG_MMU */ |
| 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 nth_page(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) { \ |
| if (level <= MMINIT_WARNING) \ |
| printk(KERN_WARNING "mminit::" prefix " " fmt, ##arg); \ |
| else \ |
| printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \ |
| } \ |
| } while (0) |
| |
| extern void mminit_verify_pageflags_layout(void); |
| 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_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 |
| |
| 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; |
| |
| extern unsigned long vm_mmap_pgoff(struct file *, unsigned long, |
| unsigned long, unsigned long, |
| unsigned long, unsigned long); |
| |
| extern void set_pageblock_order(void); |
| unsigned long reclaim_clean_pages_from_list(struct zone *zone, |
| struct list_head *page_list); |
| /* 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 */ |
| #define ALLOC_FAIR 0x100 /* fair zone allocation */ |
| |
| enum ttu_flags; |
| struct tlbflush_unmap_batch; |
| |
| #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
| void try_to_unmap_flush(void); |
| void try_to_unmap_flush_dirty(void); |
| #else |
| static inline void try_to_unmap_flush(void) |
| { |
| } |
| static inline void try_to_unmap_flush_dirty(void) |
| { |
| } |
| |
| #endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */ |
| |
| extern const struct trace_print_flags pageflag_names[]; |
| extern const struct trace_print_flags vmaflag_names[]; |
| extern const struct trace_print_flags gfpflag_names[]; |
| |
| #endif /* __MM_INTERNAL_H */ |