[mirror_ubuntu-zesty-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>

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);
void free_huge_page(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);
8f1d26d0	83	void free_huge_page(struct page *page);
1da177e4	84
3212b535 SC	85	#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
	86	pte_t huge_pmd_share(struct mm_struct mm, unsigned long addr, pud_t *pud);
	87	#endif
	88
396faf03	89	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	90	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	91	extern int sysctl_hugetlb_shm_group;
53ba51d2	92	extern struct list_head huge_boot_pages;
1da177e4	93
63551ae0 DG	94	/* arch callbacks */
63551ae0 DG	95
a5516438 AK	96	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	97	unsigned long addr, unsigned long sz);
63551ae0	98	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	99	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	100	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	101	int write);
	102	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	103	pmd_t *pmd, int write);
ceb86879 AK	104	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	105	pud_t *pud, int write);
63551ae0	106	int pmd_huge(pmd_t pmd);
ceb86879	107	int pud_huge(pud_t pmd);
7da4d641	108	unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
8f860591	109	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	110
1da177e4 LT	111	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	112
20a0307c WF	113	static inline int PageHuge(struct page *page)
	114	{
	115	return 0;
	116	}
	117
a1e78772 MG	118	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	119	{
	120	}
	121
1da177e4 LT	122	static inline unsigned long hugetlb_total_pages(void)
	123	{
	124	return 0;
	125	}
	126
5b23dbe8	127	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	128	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
1da177e4 LT	129	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
e1759c21 AD	130	static inline void hugetlb_report_meminfo(struct seq_file *m)
	131	{
	132	}
1da177e4	133	#define hugetlb_report_node_meminfo(n, buf) 0
949f7ec5 DR	134	static inline void hugetlb_show_meminfo(void)
	135	{
	136	}
1da177e4	137	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	138	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	139	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	140	#define pmd_huge(x) 0
ceb86879	141	#define pud_huge(x) 0
1da177e4	142	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	143	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	144	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	145	#define huge_pte_offset(mm, address) 0
24669e58 AK	146	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	147	{
	148	return 0;
	149	}
	150
f40386a4 NH	151	static inline bool isolate_huge_page(struct page page, struct list_head list)
	152	{
	153	return false;
	154	}
31caf665	155	#define putback_active_hugepage(p) do {} while (0)
c8721bbb	156	#define is_hugepage_active(x) false
1da177e4	157
7da4d641 PZ	158	static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	159	unsigned long address, unsigned long end, pgprot_t newprot)
	160	{
	161	return 0;
	162	}
8f860591	163
d833352a MG	164	static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	165	struct vm_area_struct *vma, unsigned long start,
	166	unsigned long end, struct page *ref_page)
	167	{
	168	BUG();
	169	}
	170
24669e58 AK	171	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	172	struct vm_area_struct *vma, unsigned long start,
	173	unsigned long end, struct page *ref_page)
	174	{
	175	BUG();
	176	}
	177
1da177e4 LT	178	#endif /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	179
4e52780d EM	180	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	181
6bfde05b EM	182	enum {
	183	/*
	184	* The file will be used as an shm file so shmfs accounting rules
	185	* apply
	186	*/
	187	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	188	/*
	189	* The file is being created on the internal vfs mount and shmfs
	190	* accounting rules do not apply
	191	*/
	192	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	193	};
6bfde05b EM	194
1da177e4	195	#ifdef CONFIG_HUGETLBFS
1da177e4	196	struct hugetlbfs_sb_info {
1da177e4 LT	197	long max_inodes; /* inodes allowed */
	198	long free_inodes; /* inodes free */
	199	spinlock_t stat_lock;
a137e1cc	200	struct hstate *hstate;
90481622	201	struct hugepage_subpool *spool;
1da177e4 LT	202	};
1da177e4 LT	203
1da177e4 LT	204	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	205	{
	206	return sb->s_fs_info;
	207	}
	208
4b6f5d20	209	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	210	extern const struct vm_operations_struct hugetlb_vm_ops;
af73e4d9	211	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
42d7395f AK	212	struct user_struct **user, int creat_flags,
42d7395f AK	213	int page_size_log);
1da177e4 LT	214
	215	static inline int is_file_hugepages(struct file *file)
	216	{
516dffdc AL	217	if (file->f_op == &hugetlbfs_file_operations)
	218	return 1;
	219	if (is_file_shm_hugepages(file))
	220	return 1;
	221
	222	return 0;
1da177e4 LT	223	}
1da177e4 LT	224
42d7395f	225
1da177e4 LT	226	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	227
1db8508c	228	#define is_file_hugepages(file) 0
40716e29	229	static inline struct file *
af73e4d9 NH	230	hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
af73e4d9 NH	231	struct user_struct **user, int creat_flags,
42d7395f	232	int page_size_log)
e9ea0e2d AM	233	{
	234	return ERR_PTR(-ENOSYS);
	235	}
1da177e4 LT	236
	237	#endif /* !CONFIG_HUGETLBFS */
	238
d2ba27e8 AB	239	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	240	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	241	unsigned long len, unsigned long pgoff,
	242	unsigned long flags);
	243	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	244
a5516438 AK	245	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	246
a3437870	247	#define HSTATE_NAME_LEN 32
a5516438 AK	248	/* Defines one hugetlb page size */
a5516438 AK	249	struct hstate {
e8c5c824 LS	250	int next_nid_to_alloc;
e8c5c824 LS	251	int next_nid_to_free;
a5516438 AK	252	unsigned int order;
	253	unsigned long mask;
	254	unsigned long max_huge_pages;
	255	unsigned long nr_huge_pages;
	256	unsigned long free_huge_pages;
	257	unsigned long resv_huge_pages;
	258	unsigned long surplus_huge_pages;
	259	unsigned long nr_overcommit_huge_pages;
0edaecfa	260	struct list_head hugepage_activelist;
a5516438 AK	261	struct list_head hugepage_freelists[MAX_NUMNODES];
	262	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	263	unsigned int free_huge_pages_node[MAX_NUMNODES];
	264	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
abb8206c AK	265	#ifdef CONFIG_CGROUP_HUGETLB
	266	/* cgroup control files */
	267	struct cftype cgroup_files[5];
	268	#endif
a3437870	269	char name[HSTATE_NAME_LEN];
a5516438 AK	270	};
a5516438 AK	271
53ba51d2 JT	272	struct huge_bootmem_page {
	273	struct list_head list;
	274	struct hstate *hstate;
ee8f248d BB	275	#ifdef CONFIG_HIGHMEM
	276	phys_addr_t phys;
	277	#endif
53ba51d2 JT	278	};
53ba51d2 JT	279
bf50bab2	280	struct page alloc_huge_page_node(struct hstate h, int nid);
74060e4d NH	281	struct page alloc_huge_page_noerr(struct vm_area_struct vma,
74060e4d NH	282	unsigned long addr, int avoid_reserve);
bf50bab2	283
53ba51d2 JT	284	/* arch callback */
	285	int __init alloc_bootmem_huge_page(struct hstate *h);
	286
e5ff2159 AK	287	void __init hugetlb_add_hstate(unsigned order);
	288	struct hstate *size_to_hstate(unsigned long size);
	289
	290	#ifndef HUGE_MAX_HSTATE
	291	#define HUGE_MAX_HSTATE 1
	292	#endif
	293
	294	extern struct hstate hstates[HUGE_MAX_HSTATE];
	295	extern unsigned int default_hstate_idx;
	296
	297	#define default_hstate (hstates[default_hstate_idx])
a5516438	298
a137e1cc	299	static inline struct hstate hstate_inode(struct inode i)
a5516438	300	{
a137e1cc AK	301	struct hugetlbfs_sb_info *hsb;
	302	hsb = HUGETLBFS_SB(i->i_sb);
	303	return hsb->hstate;
a5516438 AK	304	}
	305
	306	static inline struct hstate hstate_file(struct file f)
	307	{
496ad9aa	308	return hstate_inode(file_inode(f));
a5516438 AK	309	}
a5516438 AK	310
af73e4d9 NH	311	static inline struct hstate *hstate_sizelog(int page_size_log)
	312	{
	313	if (!page_size_log)
	314	return &default_hstate;
	315	return size_to_hstate(1 << page_size_log);
	316	}
	317
a137e1cc	318	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	319	{
a137e1cc	320	return hstate_file(vma->vm_file);
a5516438 AK	321	}
	322
	323	static inline unsigned long huge_page_size(struct hstate *h)
	324	{
	325	return (unsigned long)PAGE_SIZE << h->order;
	326	}
	327
08fba699 MG	328	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	329
3340289d MG	330	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	331
a5516438 AK	332	static inline unsigned long huge_page_mask(struct hstate *h)
	333	{
	334	return h->mask;
	335	}
	336
	337	static inline unsigned int huge_page_order(struct hstate *h)
	338	{
	339	return h->order;
	340	}
	341
	342	static inline unsigned huge_page_shift(struct hstate *h)
	343	{
	344	return h->order + PAGE_SHIFT;
	345	}
	346
bae7f4ae LC	347	static inline bool hstate_is_gigantic(struct hstate *h)
	348	{
	349	return huge_page_order(h) >= MAX_ORDER;
	350	}
	351
a5516438 AK	352	static inline unsigned int pages_per_huge_page(struct hstate *h)
	353	{
	354	return 1 << h->order;
	355	}
	356
	357	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	358	{
	359	return huge_page_size(h) / 512;
	360	}
	361
	362	#include <asm/hugetlb.h>
	363
d9ed9faa CM	364	#ifndef arch_make_huge_pte
	365	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	366	struct page *page, int writable)
	367	{
	368	return entry;
	369	}
	370	#endif
	371
e5ff2159 AK	372	static inline struct hstate page_hstate(struct page page)
e5ff2159 AK	373	{
309381fe	374	VM_BUG_ON_PAGE(!PageHuge(page), page);
e5ff2159 AK	375	return size_to_hstate(PAGE_SIZE << compound_order(page));
	376	}
	377
aa50d3a7 AK	378	static inline unsigned hstate_index_to_shift(unsigned index)
	379	{
	380	return hstates[index].order + PAGE_SHIFT;
	381	}
	382
972dc4de AK	383	static inline int hstate_index(struct hstate *h)
	384	{
	385	return h - hstates;
	386	}
	387
13d60f4b ZY	388	pgoff_t __basepage_index(struct page *page);
	389
	390	/* Return page->index in PAGE_SIZE units */
	391	static inline pgoff_t basepage_index(struct page *page)
	392	{
	393	if (!PageCompound(page))
	394	return page->index;
	395
	396	return __basepage_index(page);
	397	}
	398
c8721bbb NH	399	extern void dissolve_free_huge_pages(unsigned long start_pfn,
c8721bbb NH	400	unsigned long end_pfn);
100873d7	401	static inline int hugepage_migration_supported(struct hstate *h)
83467efb	402	{
c177c81e NH	403	#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	404	return huge_page_shift(h) == PMD_SHIFT;
	405	#else
	406	return 0;
	407	#endif
83467efb	408	}
c8721bbb	409
cb900f41 KS	410	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	411	struct mm_struct mm, pte_t pte)
	412	{
	413	if (huge_page_size(h) == PMD_SIZE)
	414	return pmd_lockptr(mm, (pmd_t *) pte);
	415	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	416	return &mm->page_table_lock;
	417	}
	418
457c1b27 NA	419	static inline bool hugepages_supported(void)
	420	{
	421	/*
	422	* Some platform decide whether they support huge pages at boot
	423	* time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
	424	* there is no such support
	425	*/
	426	return HPAGE_SHIFT != 0;
	427	}
	428
af73e4d9	429	#else /* CONFIG_HUGETLB_PAGE */
a5516438	430	struct hstate {};
bf50bab2	431	#define alloc_huge_page_node(h, nid) NULL
74060e4d	432	#define alloc_huge_page_noerr(v, a, r) NULL
53ba51d2	433	#define alloc_bootmem_huge_page(h) NULL
a5516438	434	#define hstate_file(f) NULL
af73e4d9	435	#define hstate_sizelog(s) NULL
a5516438 AK	436	#define hstate_vma(v) NULL
a5516438 AK	437	#define hstate_inode(i) NULL
cb900f41	438	#define page_hstate(page) NULL
a5516438 AK	439	#define huge_page_size(h) PAGE_SIZE
a5516438 AK	440	#define huge_page_mask(h) PAGE_MASK
08fba699	441	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	442	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	443	#define huge_page_order(h) 0
a5516438 AK	444	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	445	static inline unsigned int pages_per_huge_page(struct hstate *h)
	446	{
	447	return 1;
	448	}
aa50d3a7	449	#define hstate_index_to_shift(index) 0
972dc4de	450	#define hstate_index(h) 0
13d60f4b ZY	451
	452	static inline pgoff_t basepage_index(struct page *page)
	453	{
	454	return page->index;
	455	}
c8721bbb	456	#define dissolve_free_huge_pages(s, e) do {} while (0)
100873d7	457	#define hugepage_migration_supported(h) 0
cb900f41 KS	458
	459	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	460	struct mm_struct mm, pte_t pte)
	461	{
	462	return &mm->page_table_lock;
	463	}
af73e4d9	464	#endif /* CONFIG_HUGETLB_PAGE */
a5516438	465
cb900f41 KS	466	static inline spinlock_t huge_pte_lock(struct hstate h,
	467	struct mm_struct mm, pte_t pte)
	468	{
	469	spinlock_t *ptl;
	470
	471	ptl = huge_pte_lockptr(h, mm, pte);
	472	spin_lock(ptl);
	473	return ptl;
	474	}
	475
1da177e4	476	#endif /* _LINUX_HUGETLB_H */