[mirror_ubuntu-bionic-kernel.git] / include / linux / hugetlb.h

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/mm_types.h>
#include <linux/mmdebug.h>
#include <linux/fs.h>
#include <linux/hugetlb_inline.h>
#include <linux/cgroup.h>
#include <linux/list.h>
#include <linux/kref.h>
#include <asm/pgtable.h>

struct ctl_table;
struct user_struct;
struct mmu_gather;

#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mempolicy.h>
#include <linux/shm.h>
#include <asm/tlbflush.h>

struct hugepage_subpool {
	spinlock_t lock;
	long count;
	long max_hpages;	/* Maximum huge pages or -1 if no maximum. */
	long used_hpages;	/* Used count against maximum, includes */
				/* both alloced and reserved pages. */
	struct hstate *hstate;
	long min_hpages;	/* Minimum huge pages or -1 if no minimum. */
	long rsv_hpages;	/* Pages reserved against global pool to */
				/* sasitfy minimum size. */
};

struct resv_map {
	struct kref refs;
	spinlock_t lock;
	struct list_head regions;
	long adds_in_progress;
	struct list_head region_cache;
	long region_cache_count;
};
extern struct resv_map *resv_map_alloc(void);
void resv_map_release(struct kref *ref);

extern spinlock_t hugetlb_lock;
extern int hugetlb_max_hstate __read_mostly;
#define for_each_hstate(h) \
	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)

struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
						long min_hpages);
void hugepage_put_subpool(struct hugepage_subpool *spool);

void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);

#ifdef CONFIG_NUMA
int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
					void __user *, size_t *, loff_t *);
#endif

int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			 struct page **, struct vm_area_struct **,
			 unsigned long *, unsigned long *, long, unsigned int,
			 int *);
void unmap_hugepage_range(struct vm_area_struct *,
			  unsigned long, unsigned long, struct page *);
void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			  struct vm_area_struct *vma,
			  unsigned long start, unsigned long end,
			  struct page *ref_page);
void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
				unsigned long start, unsigned long end,
				struct page *ref_page);
void hugetlb_report_meminfo(struct seq_file *);
int hugetlb_report_node_meminfo(int, char *);
void hugetlb_show_meminfo(void);
unsigned long hugetlb_total_pages(void);
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
			unsigned long address, unsigned int flags);
int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
				struct vm_area_struct *dst_vma,
				unsigned long dst_addr,
				unsigned long src_addr,
				struct page **pagep);
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
						struct vm_area_struct *vma,
						vm_flags_t vm_flags);
long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
						long freed);
int dequeue_hwpoisoned_huge_page(struct page *page);
bool isolate_huge_page(struct page *page, struct list_head *list);
void putback_active_hugepage(struct page *page);
void free_huge_page(struct page *page);
void hugetlb_fix_reserve_counts(struct inode *inode);
extern struct mutex *hugetlb_fault_mutex_table;
u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
				struct vm_area_struct *vma,
				struct address_space *mapping,
				pgoff_t idx, unsigned long address);

pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);

extern int hugepages_treat_as_movable;
extern int sysctl_hugetlb_shm_group;
extern struct list_head huge_boot_pages;

/* arch callbacks */

pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
			      int write);
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
				pmd_t *pmd, int flags);
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int flags);
struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
			     pgd_t *pgd, int flags);

int pmd_huge(pmd_t pmd);
int pud_huge(pud_t pud);
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot);

bool is_hugetlb_entry_migration(pte_t pte);
#else /* !CONFIG_HUGETLB_PAGE */

static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

#define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n)	({ BUG(); 0; })
#define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
#define hugetlb_report_node_meminfo(n, buf)	0
static inline void hugetlb_show_meminfo(void)
{
}
#define follow_huge_pmd(mm, addr, pmd, flags)	NULL
#define follow_huge_pud(mm, addr, pud, flags)	NULL
#define follow_huge_pgd(mm, addr, pgd, flags)	NULL
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
#define pmd_huge(x)	0
#define pud_huge(x)	0
#define is_hugepage_only_range(mm, addr, len)	0
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
#define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
				src_addr, pagep)	({ BUG(); 0; })
#define huge_pte_offset(mm, address)	0
static inline int dequeue_hwpoisoned_huge_page(struct page *page)
{
	return 0;
}

static inline bool isolate_huge_page(struct page *page, struct list_head *list)
{
	return false;
}
#define putback_active_hugepage(p)	do {} while (0)

static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot)
{
	return 0;
}

static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			struct vm_area_struct *vma, unsigned long start,
			unsigned long end, struct page *ref_page)
{
	BUG();
}

static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
			struct vm_area_struct *vma, unsigned long start,
			unsigned long end, struct page *ref_page)
{
	BUG();
}

#endif /* !CONFIG_HUGETLB_PAGE */
/*
 * hugepages at page global directory. If arch support
 * hugepages at pgd level, they need to define this.
 */
#ifndef pgd_huge
#define pgd_huge(x)	0
#endif
#ifndef p4d_huge
#define p4d_huge(x)	0
#endif

#ifndef pgd_write
static inline int pgd_write(pgd_t pgd)
{
	BUG();
	return 0;
}
#endif

#ifndef pud_write
static inline int pud_write(pud_t pud)
{
	BUG();
	return 0;
}
#endif

#ifndef is_hugepd
/*
 * Some architectures requires a hugepage directory format that is
 * required to support multiple hugepage sizes. For example
 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
 * introduced the same on powerpc. This allows for a more flexible hugepage
 * pagetable layout.
 */
typedef struct { unsigned long pd; } hugepd_t;
#define is_hugepd(hugepd) (0)
#define __hugepd(x) ((hugepd_t) { (x) })
static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
			      unsigned pdshift, unsigned long end,
			      int write, struct page **pages, int *nr)
{
	return 0;
}
#else
extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
		       unsigned pdshift, unsigned long end,
		       int write, struct page **pages, int *nr);
#endif

#define HUGETLB_ANON_FILE "anon_hugepage"

enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
};

#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
	struct hstate *hstate;
	struct hugepage_subpool *spool;
};

static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

extern const struct file_operations hugetlbfs_file_operations;
extern const struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
				struct user_struct **user, int creat_flags,
				int page_size_log);

static inline bool is_file_hugepages(struct file *file)
{
	if (file->f_op == &hugetlbfs_file_operations)
		return true;

	return is_file_shm_hugepages(file);
}


#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)			false
static inline struct file *
hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
		struct user_struct **user, int creat_flags,
		int page_size_log)
{
	return ERR_PTR(-ENOSYS);
}

#endif /* !CONFIG_HUGETLBFS */

#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
					unsigned long len, unsigned long pgoff,
					unsigned long flags);
#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */

#ifdef CONFIG_HUGETLB_PAGE

#define HSTATE_NAME_LEN 32
/* Defines one hugetlb page size */
struct hstate {
	int next_nid_to_alloc;
	int next_nid_to_free;
	unsigned int order;
	unsigned long mask;
	unsigned long max_huge_pages;
	unsigned long nr_huge_pages;
	unsigned long free_huge_pages;
	unsigned long resv_huge_pages;
	unsigned long surplus_huge_pages;
	unsigned long nr_overcommit_huge_pages;
	struct list_head hugepage_activelist;
	struct list_head hugepage_freelists[MAX_NUMNODES];
	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	unsigned int free_huge_pages_node[MAX_NUMNODES];
	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files[5];
#endif
	char name[HSTATE_NAME_LEN];
};

struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
#ifdef CONFIG_HIGHMEM
	phys_addr_t phys;
#endif
};

struct page *alloc_huge_page(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);
struct page *alloc_huge_page_node(struct hstate *h, int nid);
struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);
int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
			pgoff_t idx);

/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

void __init hugetlb_bad_size(void);
void __init hugetlb_add_hstate(unsigned order);
struct hstate *size_to_hstate(unsigned long size);

#ifndef HUGE_MAX_HSTATE
#define HUGE_MAX_HSTATE 1
#endif

extern struct hstate hstates[HUGE_MAX_HSTATE];
extern unsigned int default_hstate_idx;

#define default_hstate (hstates[default_hstate_idx])

static inline struct hstate *hstate_inode(struct inode *i)
{
	return HUGETLBFS_SB(i->i_sb)->hstate;
}

static inline struct hstate *hstate_file(struct file *f)
{
	return hstate_inode(file_inode(f));
}

static inline struct hstate *hstate_sizelog(int page_size_log)
{
	if (!page_size_log)
		return &default_hstate;

	return size_to_hstate(1UL << page_size_log);
}

static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
{
	return hstate_file(vma->vm_file);
}

static inline unsigned long huge_page_size(struct hstate *h)
{
	return (unsigned long)PAGE_SIZE << h->order;
}

extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

static inline unsigned long huge_page_mask(struct hstate *h)
{
	return h->mask;
}

static inline unsigned int huge_page_order(struct hstate *h)
{
	return h->order;
}

static inline unsigned huge_page_shift(struct hstate *h)
{
	return h->order + PAGE_SHIFT;
}

static inline bool hstate_is_gigantic(struct hstate *h)
{
	return huge_page_order(h) >= MAX_ORDER;
}

static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1 << h->order;
}

static inline unsigned int blocks_per_huge_page(struct hstate *h)
{
	return huge_page_size(h) / 512;
}

#include <asm/hugetlb.h>

#ifndef arch_make_huge_pte
static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
				       struct page *page, int writable)
{
	return entry;
}
#endif

static inline struct hstate *page_hstate(struct page *page)
{
	VM_BUG_ON_PAGE(!PageHuge(page), page);
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

pgoff_t __basepage_index(struct page *page);

/* Return page->index in PAGE_SIZE units */
static inline pgoff_t basepage_index(struct page *page)
{
	if (!PageCompound(page))
		return page->index;

	return __basepage_index(page);
}

extern int dissolve_free_huge_pages(unsigned long start_pfn,
				    unsigned long end_pfn);
static inline bool hugepage_migration_supported(struct hstate *h)
{
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	if ((huge_page_shift(h) == PMD_SHIFT) ||
		(huge_page_shift(h) == PGDIR_SHIFT))
		return true;
	else
		return false;
#else
	return false;
#endif
}

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	if (huge_page_size(h) == PMD_SIZE)
		return pmd_lockptr(mm, (pmd_t *) pte);
	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	return &mm->page_table_lock;
}

#ifndef hugepages_supported
/*
 * Some platform decide whether they support huge pages at boot
 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
 * when there is no such support
 */
#define hugepages_supported() (HPAGE_SHIFT != 0)
#endif

void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);

static inline void hugetlb_count_add(long l, struct mm_struct *mm)
{
	atomic_long_add(l, &mm->hugetlb_usage);
}

static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
{
	atomic_long_sub(l, &mm->hugetlb_usage);
}
#else	/* CONFIG_HUGETLB_PAGE */
struct hstate {};
#define alloc_huge_page(v, a, r) NULL
#define alloc_huge_page_node(h, nid) NULL
#define alloc_huge_page_noerr(v, a, r) NULL
#define alloc_bootmem_huge_page(h) NULL
#define hstate_file(f) NULL
#define hstate_sizelog(s) NULL
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
#define page_hstate(page) NULL
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
#define vma_kernel_pagesize(v) PAGE_SIZE
#define vma_mmu_pagesize(v) PAGE_SIZE
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
static inline bool hstate_is_gigantic(struct hstate *h)
{
	return false;
}

static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
#define hstate_index_to_shift(index) 0
#define hstate_index(h) 0

static inline pgoff_t basepage_index(struct page *page)
{
	return page->index;
}
#define dissolve_free_huge_pages(s, e)	0
#define hugepage_migration_supported(h)	false

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	return &mm->page_table_lock;
}

static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
{
}

static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
{
}
#endif	/* CONFIG_HUGETLB_PAGE */

static inline spinlock_t *huge_pte_lock(struct hstate *h,
					struct mm_struct *mm, pte_t *pte)
{
	spinlock_t *ptl;

	ptl = huge_pte_lockptr(h, mm, pte);
	spin_lock(ptl);
	return ptl;
}

#endif /* _LINUX_HUGETLB_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_HUGETLB_H
	2	#define _LINUX_HUGETLB_H
	3
be93d8cf	4	#include <linux/mm_types.h>
309381fe	5	#include <linux/mmdebug.h>
4e950f6f	6	#include <linux/fs.h>
8edf344c	7	#include <linux/hugetlb_inline.h>
abb8206c	8	#include <linux/cgroup.h>
9119a41e JK	9	#include <linux/list.h>
9119a41e JK	10	#include <linux/kref.h>
888cdbc2	11	#include <asm/pgtable.h>
4e950f6f	12
e9ea0e2d AM	13	struct ctl_table;
e9ea0e2d AM	14	struct user_struct;
24669e58	15	struct mmu_gather;
e9ea0e2d	16
1da177e4 LT	17	#ifdef CONFIG_HUGETLB_PAGE
	18
	19	#include <linux/mempolicy.h>
516dffdc	20	#include <linux/shm.h>
63551ae0	21	#include <asm/tlbflush.h>
1da177e4	22
90481622 DG	23	struct hugepage_subpool {
	24	spinlock_t lock;
	25	long count;
c6a91820 MK	26	long max_hpages; /* Maximum huge pages or -1 if no maximum. */
	27	long used_hpages; /* Used count against maximum, includes */
	28	/* both alloced and reserved pages. */
	29	struct hstate *hstate;
	30	long min_hpages; /* Minimum huge pages or -1 if no minimum. */
	31	long rsv_hpages; /* Pages reserved against global pool to */
	32	/* sasitfy minimum size. */
90481622 DG	33	};
90481622 DG	34
9119a41e JK	35	struct resv_map {
9119a41e JK	36	struct kref refs;
7b24d861	37	spinlock_t lock;
9119a41e	38	struct list_head regions;
5e911373 MK	39	long adds_in_progress;
	40	struct list_head region_cache;
	41	long region_cache_count;
9119a41e JK	42	};
	43	extern struct resv_map *resv_map_alloc(void);
	44	void resv_map_release(struct kref *ref);
	45
c3f38a38 AK	46	extern spinlock_t hugetlb_lock;
	47	extern int hugetlb_max_hstate __read_mostly;
	48	#define for_each_hstate(h) \
	49	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
	50
7ca02d0a MK	51	struct hugepage_subpool hugepage_new_subpool(struct hstate h, long max_hpages,
7ca02d0a MK	52	long min_hpages);
90481622 DG	53	void hugepage_put_subpool(struct hugepage_subpool *spool);
90481622 DG	54
a1e78772	55	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	56	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	57	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	58	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	59
	60	#ifdef CONFIG_NUMA
	61	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	62	void __user , size_t , loff_t *);
	63	#endif
	64
1da177e4	65	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
28a35716 ML	66	long follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
28a35716 ML	67	struct page , struct vm_area_struct ,
87ffc118 AA	68	unsigned long , unsigned long , long, unsigned int,
87ffc118 AA	69	int *);
04f2cbe3	70	void unmap_hugepage_range(struct vm_area_struct *,
24669e58	71	unsigned long, unsigned long, struct page *);
d833352a MG	72	void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	73	struct vm_area_struct *vma,
	74	unsigned long start, unsigned long end,
	75	struct page *ref_page);
24669e58 AK	76	void __unmap_hugepage_range(struct mmu_gather tlb, struct vm_area_struct vma,
	77	unsigned long start, unsigned long end,
	78	struct page *ref_page);
e1759c21	79	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	80	int hugetlb_report_node_meminfo(int, char *);
949f7ec5	81	void hugetlb_show_meminfo(void);
1da177e4	82	unsigned long hugetlb_total_pages(void);
ac9b9c66	83	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	84	unsigned long address, unsigned int flags);
8fb5debc MK	85	int hugetlb_mcopy_atomic_pte(struct mm_struct dst_mm, pte_t dst_pte,
	86	struct vm_area_struct *dst_vma,
	87	unsigned long dst_addr,
	88	unsigned long src_addr,
	89	struct page **pagep);
a1e78772	90	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125	91	struct vm_area_struct *vma,
ca16d140	92	vm_flags_t vm_flags);
b5cec28d MK	93	long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
b5cec28d MK	94	long freed);
6de2b1aa	95	int dequeue_hwpoisoned_huge_page(struct page *page);
31caf665 NH	96	bool isolate_huge_page(struct page page, struct list_head list);
31caf665 NH	97	void putback_active_hugepage(struct page *page);
8f1d26d0	98	void free_huge_page(struct page *page);
72e2936c	99	void hugetlb_fix_reserve_counts(struct inode *inode);
c672c7f2 MK	100	extern struct mutex *hugetlb_fault_mutex_table;
	101	u32 hugetlb_fault_mutex_hash(struct hstate h, struct mm_struct mm,
	102	struct vm_area_struct *vma,
	103	struct address_space *mapping,
	104	pgoff_t idx, unsigned long address);
1da177e4	105
3212b535	106	pte_t huge_pmd_share(struct mm_struct mm, unsigned long addr, pud_t *pud);
3212b535	107
753162cd	108	extern int hugepages_treat_as_movable;
1da177e4	109	extern int sysctl_hugetlb_shm_group;
53ba51d2	110	extern struct list_head huge_boot_pages;
1da177e4	111
63551ae0 DG	112	/* arch callbacks */
63551ae0 DG	113
a5516438 AK	114	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	115	unsigned long addr, unsigned long sz);
63551ae0	116	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	117	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	118	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	119	int write);
	120	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
e66f17ff	121	pmd_t *pmd, int flags);
ceb86879	122	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
e66f17ff	123	pud_t *pud, int flags);
faaa5b62 AK	124	struct page follow_huge_pgd(struct mm_struct mm, unsigned long address,
	125	pgd_t *pgd, int flags);
	126
63551ae0	127	int pmd_huge(pmd_t pmd);
c2febafc	128	int pud_huge(pud_t pud);
7da4d641	129	unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
8f860591	130	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	131
d5ed7444	132	bool is_hugetlb_entry_migration(pte_t pte);
1da177e4 LT	133	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	134
a1e78772 MG	135	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	136	{
	137	}
	138
1da177e4 LT	139	static inline unsigned long hugetlb_total_pages(void)
	140	{
	141	return 0;
	142	}
	143
87ffc118	144	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
1da177e4 LT	145	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
1da177e4 LT	146	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
e1759c21 AD	147	static inline void hugetlb_report_meminfo(struct seq_file *m)
	148	{
	149	}
1da177e4	150	#define hugetlb_report_node_meminfo(n, buf) 0
949f7ec5 DR	151	static inline void hugetlb_show_meminfo(void)
	152	{
	153	}
e66f17ff NH	154	#define follow_huge_pmd(mm, addr, pmd, flags) NULL
e66f17ff NH	155	#define follow_huge_pud(mm, addr, pud, flags) NULL
faaa5b62	156	#define follow_huge_pgd(mm, addr, pgd, flags) NULL
a5516438	157	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	158	#define pmd_huge(x) 0
ceb86879	159	#define pud_huge(x) 0
1da177e4	160	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	161	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	162	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
8fb5debc MK	163	#define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
8fb5debc MK	164	src_addr, pagep) ({ BUG(); 0; })
0fe6e20b	165	#define huge_pte_offset(mm, address) 0
24669e58 AK	166	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	167	{
	168	return 0;
	169	}
	170
f40386a4 NH	171	static inline bool isolate_huge_page(struct page page, struct list_head list)
	172	{
	173	return false;
	174	}
31caf665	175	#define putback_active_hugepage(p) do {} while (0)
1da177e4	176
7da4d641 PZ	177	static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	178	unsigned long address, unsigned long end, pgprot_t newprot)
	179	{
	180	return 0;
	181	}
8f860591	182
d833352a MG	183	static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	184	struct vm_area_struct *vma, unsigned long start,
	185	unsigned long end, struct page *ref_page)
	186	{
	187	BUG();
	188	}
	189
24669e58 AK	190	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	191	struct vm_area_struct *vma, unsigned long start,
	192	unsigned long end, struct page *ref_page)
	193	{
	194	BUG();
	195	}
	196
1da177e4	197	#endif /* !CONFIG_HUGETLB_PAGE */
f30c59e9 AK	198	/*
	199	* hugepages at page global directory. If arch support
	200	* hugepages at pgd level, they need to define this.
	201	*/
	202	#ifndef pgd_huge
	203	#define pgd_huge(x) 0
	204	#endif
c2febafc KS	205	#ifndef p4d_huge
	206	#define p4d_huge(x) 0
	207	#endif
f30c59e9 AK	208
	209	#ifndef pgd_write
	210	static inline int pgd_write(pgd_t pgd)
	211	{
	212	BUG();
	213	return 0;
	214	}
	215	#endif
	216
	217	#ifndef pud_write
	218	static inline int pud_write(pud_t pud)
	219	{
	220	BUG();
	221	return 0;
	222	}
	223	#endif
	224
	225	#ifndef is_hugepd
	226	/*
	227	* Some architectures requires a hugepage directory format that is
	228	* required to support multiple hugepage sizes. For example
	229	* a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
	230	* introduced the same on powerpc. This allows for a more flexible hugepage
	231	* pagetable layout.
	232	*/
	233	typedef struct { unsigned long pd; } hugepd_t;
	234	#define is_hugepd(hugepd) (0)
	235	#define __hugepd(x) ((hugepd_t) { (x) })
	236	static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
	237	unsigned pdshift, unsigned long end,
	238	int write, struct page *pages, int nr)
	239	{
	240	return 0;
	241	}
	242	#else
	243	extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
	244	unsigned pdshift, unsigned long end,
	245	int write, struct page *pages, int nr);
	246	#endif
1da177e4	247
4e52780d EM	248	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	249
6bfde05b EM	250	enum {
	251	/*
	252	* The file will be used as an shm file so shmfs accounting rules
	253	* apply
	254	*/
	255	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	256	/*
	257	* The file is being created on the internal vfs mount and shmfs
	258	* accounting rules do not apply
	259	*/
	260	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	261	};
6bfde05b EM	262
1da177e4	263	#ifdef CONFIG_HUGETLBFS
1da177e4	264	struct hugetlbfs_sb_info {
1da177e4 LT	265	long max_inodes; /* inodes allowed */
	266	long free_inodes; /* inodes free */
	267	spinlock_t stat_lock;
a137e1cc	268	struct hstate *hstate;
90481622	269	struct hugepage_subpool *spool;
1da177e4 LT	270	};
1da177e4 LT	271
1da177e4 LT	272	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	273	{
	274	return sb->s_fs_info;
	275	}
	276
4b6f5d20	277	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	278	extern const struct vm_operations_struct hugetlb_vm_ops;
af73e4d9	279	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
42d7395f AK	280	struct user_struct **user, int creat_flags,
42d7395f AK	281	int page_size_log);
1da177e4	282
719ff321	283	static inline bool is_file_hugepages(struct file *file)
1da177e4	284	{
516dffdc	285	if (file->f_op == &hugetlbfs_file_operations)
719ff321	286	return true;
516dffdc	287
719ff321	288	return is_file_shm_hugepages(file);
1da177e4 LT	289	}
1da177e4 LT	290
42d7395f	291
1da177e4 LT	292	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	293
719ff321	294	#define is_file_hugepages(file) false
40716e29	295	static inline struct file *
af73e4d9 NH	296	hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
af73e4d9 NH	297	struct user_struct **user, int creat_flags,
42d7395f	298	int page_size_log)
e9ea0e2d AM	299	{
	300	return ERR_PTR(-ENOSYS);
	301	}
1da177e4 LT	302
	303	#endif /* !CONFIG_HUGETLBFS */
	304
d2ba27e8 AB	305	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	306	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	307	unsigned long len, unsigned long pgoff,
	308	unsigned long flags);
	309	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	310
a5516438 AK	311	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	312
a3437870	313	#define HSTATE_NAME_LEN 32
a5516438 AK	314	/* Defines one hugetlb page size */
a5516438 AK	315	struct hstate {
e8c5c824 LS	316	int next_nid_to_alloc;
e8c5c824 LS	317	int next_nid_to_free;
a5516438 AK	318	unsigned int order;
	319	unsigned long mask;
	320	unsigned long max_huge_pages;
	321	unsigned long nr_huge_pages;
	322	unsigned long free_huge_pages;
	323	unsigned long resv_huge_pages;
	324	unsigned long surplus_huge_pages;
	325	unsigned long nr_overcommit_huge_pages;
0edaecfa	326	struct list_head hugepage_activelist;
a5516438 AK	327	struct list_head hugepage_freelists[MAX_NUMNODES];
	328	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	329	unsigned int free_huge_pages_node[MAX_NUMNODES];
	330	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
abb8206c AK	331	#ifdef CONFIG_CGROUP_HUGETLB
	332	/* cgroup control files */
	333	struct cftype cgroup_files[5];
	334	#endif
a3437870	335	char name[HSTATE_NAME_LEN];
a5516438 AK	336	};
a5516438 AK	337
53ba51d2 JT	338	struct huge_bootmem_page {
	339	struct list_head list;
	340	struct hstate *hstate;
ee8f248d BB	341	#ifdef CONFIG_HIGHMEM
	342	phys_addr_t phys;
	343	#endif
53ba51d2 JT	344	};
53ba51d2 JT	345
70c3547e MK	346	struct page alloc_huge_page(struct vm_area_struct vma,
70c3547e MK	347	unsigned long addr, int avoid_reserve);
bf50bab2	348	struct page alloc_huge_page_node(struct hstate h, int nid);
74060e4d NH	349	struct page alloc_huge_page_noerr(struct vm_area_struct vma,
74060e4d NH	350	unsigned long addr, int avoid_reserve);
ab76ad54 MK	351	int huge_add_to_page_cache(struct page page, struct address_space mapping,
ab76ad54 MK	352	pgoff_t idx);
bf50bab2	353
53ba51d2 JT	354	/* arch callback */
	355	int __init alloc_bootmem_huge_page(struct hstate *h);
	356
9fee021d	357	void __init hugetlb_bad_size(void);
e5ff2159 AK	358	void __init hugetlb_add_hstate(unsigned order);
	359	struct hstate *size_to_hstate(unsigned long size);
	360
	361	#ifndef HUGE_MAX_HSTATE
	362	#define HUGE_MAX_HSTATE 1
	363	#endif
	364
	365	extern struct hstate hstates[HUGE_MAX_HSTATE];
	366	extern unsigned int default_hstate_idx;
	367
	368	#define default_hstate (hstates[default_hstate_idx])
a5516438	369
a137e1cc	370	static inline struct hstate hstate_inode(struct inode i)
a5516438	371	{
7fab358d	372	return HUGETLBFS_SB(i->i_sb)->hstate;
a5516438 AK	373	}
	374
	375	static inline struct hstate hstate_file(struct file f)
	376	{
496ad9aa	377	return hstate_inode(file_inode(f));
a5516438 AK	378	}
a5516438 AK	379
af73e4d9 NH	380	static inline struct hstate *hstate_sizelog(int page_size_log)
	381	{
	382	if (!page_size_log)
	383	return &default_hstate;
97ad2be1 SL	384
97ad2be1 SL	385	return size_to_hstate(1UL << page_size_log);
af73e4d9 NH	386	}
af73e4d9 NH	387
a137e1cc	388	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	389	{
a137e1cc	390	return hstate_file(vma->vm_file);
a5516438 AK	391	}
	392
	393	static inline unsigned long huge_page_size(struct hstate *h)
	394	{
	395	return (unsigned long)PAGE_SIZE << h->order;
	396	}
	397
08fba699 MG	398	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	399
3340289d MG	400	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	401
a5516438 AK	402	static inline unsigned long huge_page_mask(struct hstate *h)
	403	{
	404	return h->mask;
	405	}
	406
	407	static inline unsigned int huge_page_order(struct hstate *h)
	408	{
	409	return h->order;
	410	}
	411
	412	static inline unsigned huge_page_shift(struct hstate *h)
	413	{
	414	return h->order + PAGE_SHIFT;
	415	}
	416
bae7f4ae LC	417	static inline bool hstate_is_gigantic(struct hstate *h)
	418	{
	419	return huge_page_order(h) >= MAX_ORDER;
	420	}
	421
a5516438 AK	422	static inline unsigned int pages_per_huge_page(struct hstate *h)
	423	{
	424	return 1 << h->order;
	425	}
	426
	427	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	428	{
	429	return huge_page_size(h) / 512;
	430	}
	431
	432	#include <asm/hugetlb.h>
	433
d9ed9faa CM	434	#ifndef arch_make_huge_pte
	435	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	436	struct page *page, int writable)
	437	{
	438	return entry;
	439	}
	440	#endif
	441
e5ff2159 AK	442	static inline struct hstate page_hstate(struct page page)
e5ff2159 AK	443	{
309381fe	444	VM_BUG_ON_PAGE(!PageHuge(page), page);
e5ff2159 AK	445	return size_to_hstate(PAGE_SIZE << compound_order(page));
	446	}
	447
aa50d3a7 AK	448	static inline unsigned hstate_index_to_shift(unsigned index)
	449	{
	450	return hstates[index].order + PAGE_SHIFT;
	451	}
	452
972dc4de AK	453	static inline int hstate_index(struct hstate *h)
	454	{
	455	return h - hstates;
	456	}
	457
13d60f4b ZY	458	pgoff_t __basepage_index(struct page *page);
	459
	460	/* Return page->index in PAGE_SIZE units */
	461	static inline pgoff_t basepage_index(struct page *page)
	462	{
	463	if (!PageCompound(page))
	464	return page->index;
	465
	466	return __basepage_index(page);
	467	}
	468
082d5b6b GS	469	extern int dissolve_free_huge_pages(unsigned long start_pfn,
082d5b6b GS	470	unsigned long end_pfn);
d70c17d4	471	static inline bool hugepage_migration_supported(struct hstate *h)
83467efb	472	{
c177c81e	473	#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
94310cbc AK	474	if ((huge_page_shift(h) == PMD_SHIFT) \|\|
	475	(huge_page_shift(h) == PGDIR_SHIFT))
	476	return true;
	477	else
	478	return false;
c177c81e	479	#else
d70c17d4	480	return false;
c177c81e	481	#endif
83467efb	482	}
c8721bbb	483
cb900f41 KS	484	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	485	struct mm_struct mm, pte_t pte)
	486	{
	487	if (huge_page_size(h) == PMD_SIZE)
	488	return pmd_lockptr(mm, (pmd_t *) pte);
	489	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	490	return &mm->page_table_lock;
	491	}
	492
2531c8cf DD	493	#ifndef hugepages_supported
	494	/*
	495	* Some platform decide whether they support huge pages at boot
	496	* time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
	497	* when there is no such support
	498	*/
	499	#define hugepages_supported() (HPAGE_SHIFT != 0)
	500	#endif
457c1b27	501
5d317b2b NH	502	void hugetlb_report_usage(struct seq_file m, struct mm_struct mm);
	503
	504	static inline void hugetlb_count_add(long l, struct mm_struct *mm)
	505	{
	506	atomic_long_add(l, &mm->hugetlb_usage);
	507	}
	508
	509	static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
	510	{
	511	atomic_long_sub(l, &mm->hugetlb_usage);
	512	}
af73e4d9	513	#else /* CONFIG_HUGETLB_PAGE */
a5516438	514	struct hstate {};
70c3547e	515	#define alloc_huge_page(v, a, r) NULL
bf50bab2	516	#define alloc_huge_page_node(h, nid) NULL
74060e4d	517	#define alloc_huge_page_noerr(v, a, r) NULL
53ba51d2	518	#define alloc_bootmem_huge_page(h) NULL
a5516438	519	#define hstate_file(f) NULL
af73e4d9	520	#define hstate_sizelog(s) NULL
a5516438 AK	521	#define hstate_vma(v) NULL
a5516438 AK	522	#define hstate_inode(i) NULL
cb900f41	523	#define page_hstate(page) NULL
a5516438 AK	524	#define huge_page_size(h) PAGE_SIZE
a5516438 AK	525	#define huge_page_mask(h) PAGE_MASK
08fba699	526	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	527	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	528	#define huge_page_order(h) 0
a5516438 AK	529	#define huge_page_shift(h) PAGE_SHIFT
94310cbc AK	530	static inline bool hstate_is_gigantic(struct hstate *h)
	531	{
	532	return false;
	533	}
	534
510a35d4 AR	535	static inline unsigned int pages_per_huge_page(struct hstate *h)
	536	{
	537	return 1;
	538	}
aa50d3a7	539	#define hstate_index_to_shift(index) 0
972dc4de	540	#define hstate_index(h) 0
13d60f4b ZY	541
	542	static inline pgoff_t basepage_index(struct page *page)
	543	{
	544	return page->index;
	545	}
082d5b6b	546	#define dissolve_free_huge_pages(s, e) 0
d70c17d4	547	#define hugepage_migration_supported(h) false
cb900f41 KS	548
	549	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	550	struct mm_struct mm, pte_t pte)
	551	{
	552	return &mm->page_table_lock;
	553	}
5d317b2b NH	554
	555	static inline void hugetlb_report_usage(struct seq_file f, struct mm_struct m)
	556	{
	557	}
	558
	559	static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
	560	{
	561	}
af73e4d9	562	#endif /* CONFIG_HUGETLB_PAGE */
a5516438	563
cb900f41 KS	564	static inline spinlock_t huge_pte_lock(struct hstate h,
	565	struct mm_struct mm, pte_t pte)
	566	{
	567	spinlock_t *ptl;
	568
	569	ptl = huge_pte_lockptr(h, mm, pte);
	570	spin_lock(ptl);
	571	return ptl;
	572	}
	573
1da177e4	574	#endif /* _LINUX_HUGETLB_H */