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

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/mm_types.h>
#include <linux/fs.h>
#include <linux/hugetlb_inline.h>
#include <linux/cgroup.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;
};

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 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(!PageHuge(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);
int pmd_huge_support(void);
/*
 * Currently hugepage migration is enabled only for pmd-based hugepage.
 * This function will be updated when hugepage migration is more widely
 * supported.
 */
static inline int hugepage_migration_support(struct hstate *h)
{
	return pmd_huge_support() && (huge_page_shift(h) == PMD_SHIFT);
}

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;
}

#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 pmd_huge_support()	0
#define hugepage_migration_support(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>
4e950f6f	5	#include <linux/fs.h>
8edf344c	6	#include <linux/hugetlb_inline.h>
abb8206c	7	#include <linux/cgroup.h>
4e950f6f	8
e9ea0e2d AM	9	struct ctl_table;
e9ea0e2d AM	10	struct user_struct;
24669e58	11	struct mmu_gather;
e9ea0e2d	12
1da177e4 LT	13	#ifdef CONFIG_HUGETLB_PAGE
	14
	15	#include <linux/mempolicy.h>
516dffdc	16	#include <linux/shm.h>
63551ae0	17	#include <asm/tlbflush.h>
1da177e4	18
90481622 DG	19	struct hugepage_subpool {
	20	spinlock_t lock;
	21	long count;
	22	long max_hpages, used_hpages;
	23	};
	24
c3f38a38 AK	25	extern spinlock_t hugetlb_lock;
	26	extern int hugetlb_max_hstate __read_mostly;
	27	#define for_each_hstate(h) \
	28	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
	29
90481622 DG	30	struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
	31	void hugepage_put_subpool(struct hugepage_subpool *spool);
	32
20a0307c WF	33	int PageHuge(struct page *page);
20a0307c WF	34
a1e78772	35	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	36	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	37	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	38	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	39
	40	#ifdef CONFIG_NUMA
	41	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	42	void __user , size_t , loff_t *);
	43	#endif
	44
1da177e4	45	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
28a35716 ML	46	long follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	47	struct page , struct vm_area_struct ,
	48	unsigned long , unsigned long , long, unsigned int);
04f2cbe3	49	void unmap_hugepage_range(struct vm_area_struct *,
24669e58	50	unsigned long, unsigned long, struct page *);
d833352a MG	51	void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	52	struct vm_area_struct *vma,
	53	unsigned long start, unsigned long end,
	54	struct page *ref_page);
24669e58 AK	55	void __unmap_hugepage_range(struct mmu_gather tlb, struct vm_area_struct vma,
	56	unsigned long start, unsigned long end,
	57	struct page *ref_page);
e1759c21	58	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	59	int hugetlb_report_node_meminfo(int, char *);
949f7ec5	60	void hugetlb_show_meminfo(void);
1da177e4	61	unsigned long hugetlb_total_pages(void);
ac9b9c66	62	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	63	unsigned long address, unsigned int flags);
a1e78772	64	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125	65	struct vm_area_struct *vma,
ca16d140	66	vm_flags_t vm_flags);
a43a8c39	67	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
6de2b1aa	68	int dequeue_hwpoisoned_huge_page(struct page *page);
31caf665 NH	69	bool isolate_huge_page(struct page page, struct list_head list);
31caf665 NH	70	void putback_active_hugepage(struct page *page);
c8721bbb	71	bool is_hugepage_active(struct page *page);
1da177e4	72
3212b535 SC	73	#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
	74	pte_t huge_pmd_share(struct mm_struct mm, unsigned long addr, pud_t *pud);
	75	#endif
	76
396faf03	77	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	78	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	79	extern int sysctl_hugetlb_shm_group;
53ba51d2	80	extern struct list_head huge_boot_pages;
1da177e4	81
63551ae0 DG	82	/* arch callbacks */
63551ae0 DG	83
a5516438 AK	84	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	85	unsigned long addr, unsigned long sz);
63551ae0	86	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	87	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	88	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	89	int write);
	90	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	91	pmd_t *pmd, int write);
ceb86879 AK	92	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	93	pud_t *pud, int write);
63551ae0	94	int pmd_huge(pmd_t pmd);
ceb86879	95	int pud_huge(pud_t pmd);
7da4d641	96	unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
8f860591	97	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	98
1da177e4 LT	99	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	100
20a0307c WF	101	static inline int PageHuge(struct page *page)
	102	{
	103	return 0;
	104	}
	105
a1e78772 MG	106	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	107	{
	108	}
	109
1da177e4 LT	110	static inline unsigned long hugetlb_total_pages(void)
	111	{
	112	return 0;
	113	}
	114
5b23dbe8	115	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	116	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
1da177e4 LT	117	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
e1759c21 AD	118	static inline void hugetlb_report_meminfo(struct seq_file *m)
	119	{
	120	}
1da177e4	121	#define hugetlb_report_node_meminfo(n, buf) 0
949f7ec5 DR	122	static inline void hugetlb_show_meminfo(void)
	123	{
	124	}
1da177e4	125	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	126	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	127	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	128	#define pmd_huge(x) 0
ceb86879	129	#define pud_huge(x) 0
1da177e4	130	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	131	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	132	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	133	#define huge_pte_offset(mm, address) 0
24669e58 AK	134	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	135	{
	136	return 0;
	137	}
	138
f40386a4 NH	139	static inline bool isolate_huge_page(struct page page, struct list_head list)
	140	{
	141	return false;
	142	}
31caf665	143	#define putback_active_hugepage(p) do {} while (0)
c8721bbb	144	#define is_hugepage_active(x) false
1da177e4	145
7da4d641 PZ	146	static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	147	unsigned long address, unsigned long end, pgprot_t newprot)
	148	{
	149	return 0;
	150	}
8f860591	151
d833352a MG	152	static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	153	struct vm_area_struct *vma, unsigned long start,
	154	unsigned long end, struct page *ref_page)
	155	{
	156	BUG();
	157	}
	158
24669e58 AK	159	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	160	struct vm_area_struct *vma, unsigned long start,
	161	unsigned long end, struct page *ref_page)
	162	{
	163	BUG();
	164	}
	165
1da177e4 LT	166	#endif /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	167
4e52780d EM	168	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	169
6bfde05b EM	170	enum {
	171	/*
	172	* The file will be used as an shm file so shmfs accounting rules
	173	* apply
	174	*/
	175	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	176	/*
	177	* The file is being created on the internal vfs mount and shmfs
	178	* accounting rules do not apply
	179	*/
	180	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	181	};
6bfde05b EM	182
1da177e4	183	#ifdef CONFIG_HUGETLBFS
1da177e4	184	struct hugetlbfs_sb_info {
1da177e4 LT	185	long max_inodes; /* inodes allowed */
	186	long free_inodes; /* inodes free */
	187	spinlock_t stat_lock;
a137e1cc	188	struct hstate *hstate;
90481622	189	struct hugepage_subpool *spool;
1da177e4 LT	190	};
1da177e4 LT	191
1da177e4 LT	192	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	193	{
	194	return sb->s_fs_info;
	195	}
	196
4b6f5d20	197	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	198	extern const struct vm_operations_struct hugetlb_vm_ops;
af73e4d9	199	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
42d7395f AK	200	struct user_struct **user, int creat_flags,
42d7395f AK	201	int page_size_log);
1da177e4 LT	202
	203	static inline int is_file_hugepages(struct file *file)
	204	{
516dffdc AL	205	if (file->f_op == &hugetlbfs_file_operations)
	206	return 1;
	207	if (is_file_shm_hugepages(file))
	208	return 1;
	209
	210	return 0;
1da177e4 LT	211	}
1da177e4 LT	212
42d7395f	213
1da177e4 LT	214	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	215
1db8508c	216	#define is_file_hugepages(file) 0
40716e29	217	static inline struct file *
af73e4d9 NH	218	hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
af73e4d9 NH	219	struct user_struct **user, int creat_flags,
42d7395f	220	int page_size_log)
e9ea0e2d AM	221	{
	222	return ERR_PTR(-ENOSYS);
	223	}
1da177e4 LT	224
	225	#endif /* !CONFIG_HUGETLBFS */
	226
d2ba27e8 AB	227	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	228	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	229	unsigned long len, unsigned long pgoff,
	230	unsigned long flags);
	231	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	232
a5516438 AK	233	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	234
a3437870	235	#define HSTATE_NAME_LEN 32
a5516438 AK	236	/* Defines one hugetlb page size */
a5516438 AK	237	struct hstate {
e8c5c824 LS	238	int next_nid_to_alloc;
e8c5c824 LS	239	int next_nid_to_free;
a5516438 AK	240	unsigned int order;
	241	unsigned long mask;
	242	unsigned long max_huge_pages;
	243	unsigned long nr_huge_pages;
	244	unsigned long free_huge_pages;
	245	unsigned long resv_huge_pages;
	246	unsigned long surplus_huge_pages;
	247	unsigned long nr_overcommit_huge_pages;
0edaecfa	248	struct list_head hugepage_activelist;
a5516438 AK	249	struct list_head hugepage_freelists[MAX_NUMNODES];
	250	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	251	unsigned int free_huge_pages_node[MAX_NUMNODES];
	252	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
abb8206c AK	253	#ifdef CONFIG_CGROUP_HUGETLB
	254	/* cgroup control files */
	255	struct cftype cgroup_files[5];
	256	#endif
a3437870	257	char name[HSTATE_NAME_LEN];
a5516438 AK	258	};
a5516438 AK	259
53ba51d2 JT	260	struct huge_bootmem_page {
	261	struct list_head list;
	262	struct hstate *hstate;
ee8f248d BB	263	#ifdef CONFIG_HIGHMEM
	264	phys_addr_t phys;
	265	#endif
53ba51d2 JT	266	};
53ba51d2 JT	267
bf50bab2	268	struct page alloc_huge_page_node(struct hstate h, int nid);
74060e4d NH	269	struct page alloc_huge_page_noerr(struct vm_area_struct vma,
74060e4d NH	270	unsigned long addr, int avoid_reserve);
bf50bab2	271
53ba51d2 JT	272	/* arch callback */
	273	int __init alloc_bootmem_huge_page(struct hstate *h);
	274
e5ff2159 AK	275	void __init hugetlb_add_hstate(unsigned order);
	276	struct hstate *size_to_hstate(unsigned long size);
	277
	278	#ifndef HUGE_MAX_HSTATE
	279	#define HUGE_MAX_HSTATE 1
	280	#endif
	281
	282	extern struct hstate hstates[HUGE_MAX_HSTATE];
	283	extern unsigned int default_hstate_idx;
	284
	285	#define default_hstate (hstates[default_hstate_idx])
a5516438	286
a137e1cc	287	static inline struct hstate hstate_inode(struct inode i)
a5516438	288	{
a137e1cc AK	289	struct hugetlbfs_sb_info *hsb;
	290	hsb = HUGETLBFS_SB(i->i_sb);
	291	return hsb->hstate;
a5516438 AK	292	}
	293
	294	static inline struct hstate hstate_file(struct file f)
	295	{
496ad9aa	296	return hstate_inode(file_inode(f));
a5516438 AK	297	}
a5516438 AK	298
af73e4d9 NH	299	static inline struct hstate *hstate_sizelog(int page_size_log)
	300	{
	301	if (!page_size_log)
	302	return &default_hstate;
	303	return size_to_hstate(1 << page_size_log);
	304	}
	305
a137e1cc	306	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	307	{
a137e1cc	308	return hstate_file(vma->vm_file);
a5516438 AK	309	}
	310
	311	static inline unsigned long huge_page_size(struct hstate *h)
	312	{
	313	return (unsigned long)PAGE_SIZE << h->order;
	314	}
	315
08fba699 MG	316	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	317
3340289d MG	318	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	319
a5516438 AK	320	static inline unsigned long huge_page_mask(struct hstate *h)
	321	{
	322	return h->mask;
	323	}
	324
	325	static inline unsigned int huge_page_order(struct hstate *h)
	326	{
	327	return h->order;
	328	}
	329
	330	static inline unsigned huge_page_shift(struct hstate *h)
	331	{
	332	return h->order + PAGE_SHIFT;
	333	}
	334
	335	static inline unsigned int pages_per_huge_page(struct hstate *h)
	336	{
	337	return 1 << h->order;
	338	}
	339
	340	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	341	{
	342	return huge_page_size(h) / 512;
	343	}
	344
	345	#include <asm/hugetlb.h>
	346
d9ed9faa CM	347	#ifndef arch_make_huge_pte
	348	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	349	struct page *page, int writable)
	350	{
	351	return entry;
	352	}
	353	#endif
	354
e5ff2159 AK	355	static inline struct hstate page_hstate(struct page page)
e5ff2159 AK	356	{
0e147aed	357	VM_BUG_ON(!PageHuge(page));
e5ff2159 AK	358	return size_to_hstate(PAGE_SIZE << compound_order(page));
	359	}
	360
aa50d3a7 AK	361	static inline unsigned hstate_index_to_shift(unsigned index)
	362	{
	363	return hstates[index].order + PAGE_SHIFT;
	364	}
	365
972dc4de AK	366	static inline int hstate_index(struct hstate *h)
	367	{
	368	return h - hstates;
	369	}
	370
13d60f4b ZY	371	pgoff_t __basepage_index(struct page *page);
	372
	373	/* Return page->index in PAGE_SIZE units */
	374	static inline pgoff_t basepage_index(struct page *page)
	375	{
	376	if (!PageCompound(page))
	377	return page->index;
	378
	379	return __basepage_index(page);
	380	}
	381
c8721bbb NH	382	extern void dissolve_free_huge_pages(unsigned long start_pfn,
c8721bbb NH	383	unsigned long end_pfn);
83467efb NH	384	int pmd_huge_support(void);
	385	/*
	386	* Currently hugepage migration is enabled only for pmd-based hugepage.
	387	* This function will be updated when hugepage migration is more widely
	388	* supported.
	389	*/
	390	static inline int hugepage_migration_support(struct hstate *h)
	391	{
	392	return pmd_huge_support() && (huge_page_shift(h) == PMD_SHIFT);
	393	}
c8721bbb	394
cb900f41 KS	395	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	396	struct mm_struct mm, pte_t pte)
	397	{
	398	if (huge_page_size(h) == PMD_SIZE)
	399	return pmd_lockptr(mm, (pmd_t *) pte);
	400	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	401	return &mm->page_table_lock;
	402	}
	403
af73e4d9	404	#else /* CONFIG_HUGETLB_PAGE */
a5516438	405	struct hstate {};
bf50bab2	406	#define alloc_huge_page_node(h, nid) NULL
74060e4d	407	#define alloc_huge_page_noerr(v, a, r) NULL
53ba51d2	408	#define alloc_bootmem_huge_page(h) NULL
a5516438	409	#define hstate_file(f) NULL
af73e4d9	410	#define hstate_sizelog(s) NULL
a5516438 AK	411	#define hstate_vma(v) NULL
a5516438 AK	412	#define hstate_inode(i) NULL
cb900f41	413	#define page_hstate(page) NULL
a5516438 AK	414	#define huge_page_size(h) PAGE_SIZE
a5516438 AK	415	#define huge_page_mask(h) PAGE_MASK
08fba699	416	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	417	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	418	#define huge_page_order(h) 0
a5516438 AK	419	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	420	static inline unsigned int pages_per_huge_page(struct hstate *h)
	421	{
	422	return 1;
	423	}
aa50d3a7	424	#define hstate_index_to_shift(index) 0
972dc4de	425	#define hstate_index(h) 0
13d60f4b ZY	426
	427	static inline pgoff_t basepage_index(struct page *page)
	428	{
	429	return page->index;
	430	}
c8721bbb	431	#define dissolve_free_huge_pages(s, e) do {} while (0)
83467efb NH	432	#define pmd_huge_support() 0
83467efb NH	433	#define hugepage_migration_support(h) 0
cb900f41 KS	434
	435	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	436	struct mm_struct mm, pte_t pte)
	437	{
	438	return &mm->page_table_lock;
	439	}
af73e4d9	440	#endif /* CONFIG_HUGETLB_PAGE */
a5516438	441
cb900f41 KS	442	static inline spinlock_t huge_pte_lock(struct hstate h,
	443	struct mm_struct mm, pte_t pte)
	444	{
	445	spinlock_t *ptl;
	446
	447	ptl = huge_pte_lockptr(h, mm, pte);
	448	spin_lock(ptl);
	449	return ptl;
	450	}
	451
1da177e4	452	#endif /* _LINUX_HUGETLB_H */