[deliverable/linux.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>

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, used_hpages;
};

struct resv_map {
	struct kref refs;
	spinlock_t lock;
	struct list_head regions;
};
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(long nr_blocks);
void hugepage_put_subpool(struct hugepage_subpool *spool);

int PageHuge(struct page *page);

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);
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_reserve_pages(struct inode *inode, long from, long to,
						struct vm_area_struct *vma,
						vm_flags_t vm_flags);
void hugetlb_unreserve_pages(struct inode *inode, long offset, 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);
bool is_hugepage_active(struct page *page);

#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
#endif

extern unsigned long hugepages_treat_as_movable;
extern const unsigned long hugetlb_zero, hugetlb_infinity;
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 write);
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int write);
int pmd_huge(pmd_t pmd);
int pud_huge(pud_t pmd);
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot);

#else /* !CONFIG_HUGETLB_PAGE */

static inline int PageHuge(struct page *page)
{
	return 0;
}

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)	({ 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, write)	NULL
#define follow_huge_pud(mm, addr, pud, write)	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 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)
#define is_hugepage_active(x)	false

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 */

#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 int is_file_hugepages(struct file *file)
{
	if (file->f_op == &hugetlbfs_file_operations)
		return 1;
	if (is_file_shm_hugepages(file))
		return 1;

	return 0;
}


#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)			0
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_node(struct hstate *h, int nid);
struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);

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

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)
{
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->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(1 << 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 void dissolve_free_huge_pages(unsigned long start_pfn,
				     unsigned long end_pfn);
static inline int hugepage_migration_supported(struct hstate *h)
{
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	return huge_page_shift(h) == PMD_SHIFT;
#else
	return 0;
#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;
}

static inline bool hugepages_supported(void)
{
	/*
	 * Some platform decide whether they support huge pages at boot
	 * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
	 * there is no such support
	 */
	return HPAGE_SHIFT != 0;
}

#else	/* CONFIG_HUGETLB_PAGE */
struct hstate {};
#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 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)	do {} while (0)
#define hugepage_migration_supported(h)	0

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	return &mm->page_table_lock;
}
#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>
4e950f6f	11
e9ea0e2d AM	12	struct ctl_table;
e9ea0e2d AM	13	struct user_struct;
24669e58	14	struct mmu_gather;
e9ea0e2d	15
1da177e4 LT	16	#ifdef CONFIG_HUGETLB_PAGE
	17
	18	#include <linux/mempolicy.h>
516dffdc	19	#include <linux/shm.h>
63551ae0	20	#include <asm/tlbflush.h>
1da177e4	21
90481622 DG	22	struct hugepage_subpool {
	23	spinlock_t lock;
	24	long count;
	25	long max_hpages, used_hpages;
	26	};
	27
9119a41e JK	28	struct resv_map {
9119a41e JK	29	struct kref refs;
7b24d861	30	spinlock_t lock;
9119a41e JK	31	struct list_head regions;
	32	};
	33	extern struct resv_map *resv_map_alloc(void);
	34	void resv_map_release(struct kref *ref);
	35
c3f38a38 AK	36	extern spinlock_t hugetlb_lock;
	37	extern int hugetlb_max_hstate __read_mostly;
	38	#define for_each_hstate(h) \
	39	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
	40
90481622 DG	41	struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
	42	void hugepage_put_subpool(struct hugepage_subpool *spool);
	43
20a0307c WF	44	int PageHuge(struct page *page);
20a0307c WF	45
a1e78772	46	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	47	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	48	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	49	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	50
	51	#ifdef CONFIG_NUMA
	52	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	53	void __user , size_t , loff_t *);
	54	#endif
	55
1da177e4	56	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
28a35716 ML	57	long follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	58	struct page , struct vm_area_struct ,
	59	unsigned long , unsigned long , long, unsigned int);
04f2cbe3	60	void unmap_hugepage_range(struct vm_area_struct *,
24669e58	61	unsigned long, unsigned long, struct page *);
d833352a MG	62	void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	63	struct vm_area_struct *vma,
	64	unsigned long start, unsigned long end,
	65	struct page *ref_page);
24669e58 AK	66	void __unmap_hugepage_range(struct mmu_gather tlb, struct vm_area_struct vma,
	67	unsigned long start, unsigned long end,
	68	struct page *ref_page);
e1759c21	69	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	70	int hugetlb_report_node_meminfo(int, char *);
949f7ec5	71	void hugetlb_show_meminfo(void);
1da177e4	72	unsigned long hugetlb_total_pages(void);
ac9b9c66	73	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	74	unsigned long address, unsigned int flags);
a1e78772	75	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125	76	struct vm_area_struct *vma,
ca16d140	77	vm_flags_t vm_flags);
a43a8c39	78	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
6de2b1aa	79	int dequeue_hwpoisoned_huge_page(struct page *page);
31caf665 NH	80	bool isolate_huge_page(struct page page, struct list_head list);
31caf665 NH	81	void putback_active_hugepage(struct page *page);
c8721bbb	82	bool is_hugepage_active(struct page *page);
1da177e4	83
3212b535 SC	84	#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
	85	pte_t huge_pmd_share(struct mm_struct mm, unsigned long addr, pud_t *pud);
	86	#endif
	87
396faf03	88	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	89	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	90	extern int sysctl_hugetlb_shm_group;
53ba51d2	91	extern struct list_head huge_boot_pages;
1da177e4	92
63551ae0 DG	93	/* arch callbacks */
63551ae0 DG	94
a5516438 AK	95	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	96	unsigned long addr, unsigned long sz);
63551ae0	97	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	98	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	99	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	100	int write);
	101	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	102	pmd_t *pmd, int write);
ceb86879 AK	103	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	104	pud_t *pud, int write);
63551ae0	105	int pmd_huge(pmd_t pmd);
ceb86879	106	int pud_huge(pud_t pmd);
7da4d641	107	unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
8f860591	108	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	109
1da177e4 LT	110	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	111
20a0307c WF	112	static inline int PageHuge(struct page *page)
	113	{
	114	return 0;
	115	}
	116
a1e78772 MG	117	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	118	{
	119	}
	120
1da177e4 LT	121	static inline unsigned long hugetlb_total_pages(void)
	122	{
	123	return 0;
	124	}
	125
5b23dbe8	126	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	127	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
1da177e4 LT	128	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
e1759c21 AD	129	static inline void hugetlb_report_meminfo(struct seq_file *m)
	130	{
	131	}
1da177e4	132	#define hugetlb_report_node_meminfo(n, buf) 0
949f7ec5 DR	133	static inline void hugetlb_show_meminfo(void)
	134	{
	135	}
1da177e4	136	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	137	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	138	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	139	#define pmd_huge(x) 0
ceb86879	140	#define pud_huge(x) 0
1da177e4	141	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	142	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	143	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	144	#define huge_pte_offset(mm, address) 0
24669e58 AK	145	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	146	{
	147	return 0;
	148	}
	149
f40386a4 NH	150	static inline bool isolate_huge_page(struct page page, struct list_head list)
	151	{
	152	return false;
	153	}
31caf665	154	#define putback_active_hugepage(p) do {} while (0)
c8721bbb	155	#define is_hugepage_active(x) false
1da177e4	156
7da4d641 PZ	157	static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	158	unsigned long address, unsigned long end, pgprot_t newprot)
	159	{
	160	return 0;
	161	}
8f860591	162
d833352a MG	163	static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	164	struct vm_area_struct *vma, unsigned long start,
	165	unsigned long end, struct page *ref_page)
	166	{
	167	BUG();
	168	}
	169
24669e58 AK	170	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	171	struct vm_area_struct *vma, unsigned long start,
	172	unsigned long end, struct page *ref_page)
	173	{
	174	BUG();
	175	}
	176
1da177e4 LT	177	#endif /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	178
4e52780d EM	179	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	180
6bfde05b EM	181	enum {
	182	/*
	183	* The file will be used as an shm file so shmfs accounting rules
	184	* apply
	185	*/
	186	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	187	/*
	188	* The file is being created on the internal vfs mount and shmfs
	189	* accounting rules do not apply
	190	*/
	191	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	192	};
6bfde05b EM	193
1da177e4	194	#ifdef CONFIG_HUGETLBFS
1da177e4	195	struct hugetlbfs_sb_info {
1da177e4 LT	196	long max_inodes; /* inodes allowed */
	197	long free_inodes; /* inodes free */
	198	spinlock_t stat_lock;
a137e1cc	199	struct hstate *hstate;
90481622	200	struct hugepage_subpool *spool;
1da177e4 LT	201	};
1da177e4 LT	202
1da177e4 LT	203	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	204	{
	205	return sb->s_fs_info;
	206	}
	207
4b6f5d20	208	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	209	extern const struct vm_operations_struct hugetlb_vm_ops;
af73e4d9	210	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
42d7395f AK	211	struct user_struct **user, int creat_flags,
42d7395f AK	212	int page_size_log);
1da177e4 LT	213
	214	static inline int is_file_hugepages(struct file *file)
	215	{
516dffdc AL	216	if (file->f_op == &hugetlbfs_file_operations)
	217	return 1;
	218	if (is_file_shm_hugepages(file))
	219	return 1;
	220
	221	return 0;
1da177e4 LT	222	}
1da177e4 LT	223
42d7395f	224
1da177e4 LT	225	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	226
1db8508c	227	#define is_file_hugepages(file) 0
40716e29	228	static inline struct file *
af73e4d9 NH	229	hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
af73e4d9 NH	230	struct user_struct **user, int creat_flags,
42d7395f	231	int page_size_log)
e9ea0e2d AM	232	{
	233	return ERR_PTR(-ENOSYS);
	234	}
1da177e4 LT	235
	236	#endif /* !CONFIG_HUGETLBFS */
	237
d2ba27e8 AB	238	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	239	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	240	unsigned long len, unsigned long pgoff,
	241	unsigned long flags);
	242	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	243
a5516438 AK	244	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	245
a3437870	246	#define HSTATE_NAME_LEN 32
a5516438 AK	247	/* Defines one hugetlb page size */
a5516438 AK	248	struct hstate {
e8c5c824 LS	249	int next_nid_to_alloc;
e8c5c824 LS	250	int next_nid_to_free;
a5516438 AK	251	unsigned int order;
	252	unsigned long mask;
	253	unsigned long max_huge_pages;
	254	unsigned long nr_huge_pages;
	255	unsigned long free_huge_pages;
	256	unsigned long resv_huge_pages;
	257	unsigned long surplus_huge_pages;
	258	unsigned long nr_overcommit_huge_pages;
0edaecfa	259	struct list_head hugepage_activelist;
a5516438 AK	260	struct list_head hugepage_freelists[MAX_NUMNODES];
	261	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	262	unsigned int free_huge_pages_node[MAX_NUMNODES];
	263	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
abb8206c AK	264	#ifdef CONFIG_CGROUP_HUGETLB
	265	/* cgroup control files */
	266	struct cftype cgroup_files[5];
	267	#endif
a3437870	268	char name[HSTATE_NAME_LEN];
a5516438 AK	269	};
a5516438 AK	270
53ba51d2 JT	271	struct huge_bootmem_page {
	272	struct list_head list;
	273	struct hstate *hstate;
ee8f248d BB	274	#ifdef CONFIG_HIGHMEM
	275	phys_addr_t phys;
	276	#endif
53ba51d2 JT	277	};
53ba51d2 JT	278
bf50bab2	279	struct page alloc_huge_page_node(struct hstate h, int nid);
74060e4d NH	280	struct page alloc_huge_page_noerr(struct vm_area_struct vma,
74060e4d NH	281	unsigned long addr, int avoid_reserve);
bf50bab2	282
53ba51d2 JT	283	/* arch callback */
	284	int __init alloc_bootmem_huge_page(struct hstate *h);
	285
e5ff2159 AK	286	void __init hugetlb_add_hstate(unsigned order);
	287	struct hstate *size_to_hstate(unsigned long size);
	288
	289	#ifndef HUGE_MAX_HSTATE
	290	#define HUGE_MAX_HSTATE 1
	291	#endif
	292
	293	extern struct hstate hstates[HUGE_MAX_HSTATE];
	294	extern unsigned int default_hstate_idx;
	295
	296	#define default_hstate (hstates[default_hstate_idx])
a5516438	297
a137e1cc	298	static inline struct hstate hstate_inode(struct inode i)
a5516438	299	{
a137e1cc AK	300	struct hugetlbfs_sb_info *hsb;
	301	hsb = HUGETLBFS_SB(i->i_sb);
	302	return hsb->hstate;
a5516438 AK	303	}
	304
	305	static inline struct hstate hstate_file(struct file f)
	306	{
496ad9aa	307	return hstate_inode(file_inode(f));
a5516438 AK	308	}
a5516438 AK	309
af73e4d9 NH	310	static inline struct hstate *hstate_sizelog(int page_size_log)
	311	{
	312	if (!page_size_log)
	313	return &default_hstate;
	314	return size_to_hstate(1 << page_size_log);
	315	}
	316
a137e1cc	317	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	318	{
a137e1cc	319	return hstate_file(vma->vm_file);
a5516438 AK	320	}
	321
	322	static inline unsigned long huge_page_size(struct hstate *h)
	323	{
	324	return (unsigned long)PAGE_SIZE << h->order;
	325	}
	326
08fba699 MG	327	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	328
3340289d MG	329	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	330
a5516438 AK	331	static inline unsigned long huge_page_mask(struct hstate *h)
	332	{
	333	return h->mask;
	334	}
	335
	336	static inline unsigned int huge_page_order(struct hstate *h)
	337	{
	338	return h->order;
	339	}
	340
	341	static inline unsigned huge_page_shift(struct hstate *h)
	342	{
	343	return h->order + PAGE_SHIFT;
	344	}
	345
bae7f4ae LC	346	static inline bool hstate_is_gigantic(struct hstate *h)
	347	{
	348	return huge_page_order(h) >= MAX_ORDER;
	349	}
	350
a5516438 AK	351	static inline unsigned int pages_per_huge_page(struct hstate *h)
	352	{
	353	return 1 << h->order;
	354	}
	355
	356	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	357	{
	358	return huge_page_size(h) / 512;
	359	}
	360
	361	#include <asm/hugetlb.h>
	362
d9ed9faa CM	363	#ifndef arch_make_huge_pte
	364	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	365	struct page *page, int writable)
	366	{
	367	return entry;
	368	}
	369	#endif
	370
e5ff2159 AK	371	static inline struct hstate page_hstate(struct page page)
e5ff2159 AK	372	{
309381fe	373	VM_BUG_ON_PAGE(!PageHuge(page), page);
e5ff2159 AK	374	return size_to_hstate(PAGE_SIZE << compound_order(page));
	375	}
	376
aa50d3a7 AK	377	static inline unsigned hstate_index_to_shift(unsigned index)
	378	{
	379	return hstates[index].order + PAGE_SHIFT;
	380	}
	381
972dc4de AK	382	static inline int hstate_index(struct hstate *h)
	383	{
	384	return h - hstates;
	385	}
	386
13d60f4b ZY	387	pgoff_t __basepage_index(struct page *page);
	388
	389	/* Return page->index in PAGE_SIZE units */
	390	static inline pgoff_t basepage_index(struct page *page)
	391	{
	392	if (!PageCompound(page))
	393	return page->index;
	394
	395	return __basepage_index(page);
	396	}
	397
c8721bbb NH	398	extern void dissolve_free_huge_pages(unsigned long start_pfn,
c8721bbb NH	399	unsigned long end_pfn);
100873d7	400	static inline int hugepage_migration_supported(struct hstate *h)
83467efb	401	{
c177c81e NH	402	#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	403	return huge_page_shift(h) == PMD_SHIFT;
	404	#else
	405	return 0;
	406	#endif
83467efb	407	}
c8721bbb	408
cb900f41 KS	409	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	410	struct mm_struct mm, pte_t pte)
	411	{
	412	if (huge_page_size(h) == PMD_SIZE)
	413	return pmd_lockptr(mm, (pmd_t *) pte);
	414	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	415	return &mm->page_table_lock;
	416	}
	417
457c1b27 NA	418	static inline bool hugepages_supported(void)
	419	{
	420	/*
	421	* Some platform decide whether they support huge pages at boot
	422	* time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
	423	* there is no such support
	424	*/
	425	return HPAGE_SHIFT != 0;
	426	}
	427
af73e4d9	428	#else /* CONFIG_HUGETLB_PAGE */
a5516438	429	struct hstate {};
bf50bab2	430	#define alloc_huge_page_node(h, nid) NULL
74060e4d	431	#define alloc_huge_page_noerr(v, a, r) NULL
53ba51d2	432	#define alloc_bootmem_huge_page(h) NULL
a5516438	433	#define hstate_file(f) NULL
af73e4d9	434	#define hstate_sizelog(s) NULL
a5516438 AK	435	#define hstate_vma(v) NULL
a5516438 AK	436	#define hstate_inode(i) NULL
cb900f41	437	#define page_hstate(page) NULL
a5516438 AK	438	#define huge_page_size(h) PAGE_SIZE
a5516438 AK	439	#define huge_page_mask(h) PAGE_MASK
08fba699	440	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	441	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	442	#define huge_page_order(h) 0
a5516438 AK	443	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	444	static inline unsigned int pages_per_huge_page(struct hstate *h)
	445	{
	446	return 1;
	447	}
aa50d3a7	448	#define hstate_index_to_shift(index) 0
972dc4de	449	#define hstate_index(h) 0
13d60f4b ZY	450
	451	static inline pgoff_t basepage_index(struct page *page)
	452	{
	453	return page->index;
	454	}
c8721bbb	455	#define dissolve_free_huge_pages(s, e) do {} while (0)
100873d7	456	#define hugepage_migration_supported(h) 0
cb900f41 KS	457
	458	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	459	struct mm_struct mm, pte_t pte)
	460	{
	461	return &mm->page_table_lock;
	462	}
af73e4d9	463	#endif /* CONFIG_HUGETLB_PAGE */
a5516438	464
cb900f41 KS	465	static inline spinlock_t huge_pte_lock(struct hstate h,
	466	struct mm_struct mm, pte_t pte)
	467	{
	468	spinlock_t *ptl;
	469
	470	ptl = huge_pte_lockptr(h, mm, pte);
	471	spin_lock(ptl);
	472	return ptl;
	473	}
	474
1da177e4	475	#endif /* _LINUX_HUGETLB_H */