[mirror_ubuntu-artful-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>

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_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);
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>
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>
4e950f6f	9
e9ea0e2d AM	10	struct ctl_table;
e9ea0e2d AM	11	struct user_struct;
24669e58	12	struct mmu_gather;
e9ea0e2d	13
1da177e4 LT	14	#ifdef CONFIG_HUGETLB_PAGE
	15
	16	#include <linux/mempolicy.h>
516dffdc	17	#include <linux/shm.h>
63551ae0	18	#include <asm/tlbflush.h>
1da177e4	19
90481622 DG	20	struct hugepage_subpool {
	21	spinlock_t lock;
	22	long count;
	23	long max_hpages, used_hpages;
	24	};
	25
c3f38a38 AK	26	extern spinlock_t hugetlb_lock;
	27	extern int hugetlb_max_hstate __read_mostly;
	28	#define for_each_hstate(h) \
	29	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
	30
90481622 DG	31	struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
	32	void hugepage_put_subpool(struct hugepage_subpool *spool);
	33
20a0307c WF	34	int PageHuge(struct page *page);
20a0307c WF	35
a1e78772	36	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	37	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	38	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	39	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	40
	41	#ifdef CONFIG_NUMA
	42	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	43	void __user , size_t , loff_t *);
	44	#endif
	45
1da177e4	46	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
28a35716 ML	47	long follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	48	struct page , struct vm_area_struct ,
	49	unsigned long , unsigned long , long, unsigned int);
04f2cbe3	50	void unmap_hugepage_range(struct vm_area_struct *,
24669e58	51	unsigned long, unsigned long, struct page *);
d833352a MG	52	void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	53	struct vm_area_struct *vma,
	54	unsigned long start, unsigned long end,
	55	struct page *ref_page);
24669e58 AK	56	void __unmap_hugepage_range(struct mmu_gather tlb, struct vm_area_struct vma,
	57	unsigned long start, unsigned long end,
	58	struct page *ref_page);
e1759c21	59	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	60	int hugetlb_report_node_meminfo(int, char *);
949f7ec5	61	void hugetlb_show_meminfo(void);
1da177e4	62	unsigned long hugetlb_total_pages(void);
ac9b9c66	63	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	64	unsigned long address, unsigned int flags);
a1e78772	65	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125	66	struct vm_area_struct *vma,
ca16d140	67	vm_flags_t vm_flags);
a43a8c39	68	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
6de2b1aa	69	int dequeue_hwpoisoned_huge_page(struct page *page);
31caf665 NH	70	bool isolate_huge_page(struct page page, struct list_head list);
31caf665 NH	71	void putback_active_hugepage(struct page *page);
c8721bbb	72	bool is_hugepage_active(struct page *page);
1da177e4	73
3212b535 SC	74	#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
	75	pte_t huge_pmd_share(struct mm_struct mm, unsigned long addr, pud_t *pud);
	76	#endif
	77
396faf03	78	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	79	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	80	extern int sysctl_hugetlb_shm_group;
53ba51d2	81	extern struct list_head huge_boot_pages;
1da177e4	82
63551ae0 DG	83	/* arch callbacks */
63551ae0 DG	84
a5516438 AK	85	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	86	unsigned long addr, unsigned long sz);
63551ae0	87	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	88	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	89	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	90	int write);
	91	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	92	pmd_t *pmd, int write);
ceb86879 AK	93	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	94	pud_t *pud, int write);
63551ae0	95	int pmd_huge(pmd_t pmd);
ceb86879	96	int pud_huge(pud_t pmd);
7da4d641	97	unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
8f860591	98	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	99
1da177e4 LT	100	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	101
20a0307c WF	102	static inline int PageHuge(struct page *page)
	103	{
	104	return 0;
	105	}
	106
a1e78772 MG	107	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	108	{
	109	}
	110
1da177e4 LT	111	static inline unsigned long hugetlb_total_pages(void)
	112	{
	113	return 0;
	114	}
	115
5b23dbe8	116	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	117	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
1da177e4 LT	118	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
e1759c21 AD	119	static inline void hugetlb_report_meminfo(struct seq_file *m)
	120	{
	121	}
1da177e4	122	#define hugetlb_report_node_meminfo(n, buf) 0
949f7ec5 DR	123	static inline void hugetlb_show_meminfo(void)
	124	{
	125	}
1da177e4	126	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	127	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	128	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	129	#define pmd_huge(x) 0
ceb86879	130	#define pud_huge(x) 0
1da177e4	131	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	132	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	133	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	134	#define huge_pte_offset(mm, address) 0
24669e58 AK	135	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	136	{
	137	return 0;
	138	}
	139
f40386a4 NH	140	static inline bool isolate_huge_page(struct page page, struct list_head list)
	141	{
	142	return false;
	143	}
31caf665	144	#define putback_active_hugepage(p) do {} while (0)
c8721bbb	145	#define is_hugepage_active(x) false
1da177e4	146
7da4d641 PZ	147	static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	148	unsigned long address, unsigned long end, pgprot_t newprot)
	149	{
	150	return 0;
	151	}
8f860591	152
d833352a MG	153	static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	154	struct vm_area_struct *vma, unsigned long start,
	155	unsigned long end, struct page *ref_page)
	156	{
	157	BUG();
	158	}
	159
24669e58 AK	160	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	161	struct vm_area_struct *vma, unsigned long start,
	162	unsigned long end, struct page *ref_page)
	163	{
	164	BUG();
	165	}
	166
1da177e4 LT	167	#endif /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	168
4e52780d EM	169	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	170
6bfde05b EM	171	enum {
	172	/*
	173	* The file will be used as an shm file so shmfs accounting rules
	174	* apply
	175	*/
	176	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	177	/*
	178	* The file is being created on the internal vfs mount and shmfs
	179	* accounting rules do not apply
	180	*/
	181	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	182	};
6bfde05b EM	183
1da177e4	184	#ifdef CONFIG_HUGETLBFS
1da177e4	185	struct hugetlbfs_sb_info {
1da177e4 LT	186	long max_inodes; /* inodes allowed */
	187	long free_inodes; /* inodes free */
	188	spinlock_t stat_lock;
a137e1cc	189	struct hstate *hstate;
90481622	190	struct hugepage_subpool *spool;
1da177e4 LT	191	};
1da177e4 LT	192
1da177e4 LT	193	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	194	{
	195	return sb->s_fs_info;
	196	}
	197
4b6f5d20	198	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	199	extern const struct vm_operations_struct hugetlb_vm_ops;
af73e4d9	200	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
42d7395f AK	201	struct user_struct **user, int creat_flags,
42d7395f AK	202	int page_size_log);
1da177e4 LT	203
	204	static inline int is_file_hugepages(struct file *file)
	205	{
516dffdc AL	206	if (file->f_op == &hugetlbfs_file_operations)
	207	return 1;
	208	if (is_file_shm_hugepages(file))
	209	return 1;
	210
	211	return 0;
1da177e4 LT	212	}
1da177e4 LT	213
42d7395f	214
1da177e4 LT	215	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	216
1db8508c	217	#define is_file_hugepages(file) 0
40716e29	218	static inline struct file *
af73e4d9 NH	219	hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
af73e4d9 NH	220	struct user_struct **user, int creat_flags,
42d7395f	221	int page_size_log)
e9ea0e2d AM	222	{
	223	return ERR_PTR(-ENOSYS);
	224	}
1da177e4 LT	225
	226	#endif /* !CONFIG_HUGETLBFS */
	227
d2ba27e8 AB	228	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	229	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	230	unsigned long len, unsigned long pgoff,
	231	unsigned long flags);
	232	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	233
a5516438 AK	234	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	235
a3437870	236	#define HSTATE_NAME_LEN 32
a5516438 AK	237	/* Defines one hugetlb page size */
a5516438 AK	238	struct hstate {
e8c5c824 LS	239	int next_nid_to_alloc;
e8c5c824 LS	240	int next_nid_to_free;
a5516438 AK	241	unsigned int order;
	242	unsigned long mask;
	243	unsigned long max_huge_pages;
	244	unsigned long nr_huge_pages;
	245	unsigned long free_huge_pages;
	246	unsigned long resv_huge_pages;
	247	unsigned long surplus_huge_pages;
	248	unsigned long nr_overcommit_huge_pages;
0edaecfa	249	struct list_head hugepage_activelist;
a5516438 AK	250	struct list_head hugepage_freelists[MAX_NUMNODES];
	251	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	252	unsigned int free_huge_pages_node[MAX_NUMNODES];
	253	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
abb8206c AK	254	#ifdef CONFIG_CGROUP_HUGETLB
	255	/* cgroup control files */
	256	struct cftype cgroup_files[5];
	257	#endif
a3437870	258	char name[HSTATE_NAME_LEN];
a5516438 AK	259	};
a5516438 AK	260
53ba51d2 JT	261	struct huge_bootmem_page {
	262	struct list_head list;
	263	struct hstate *hstate;
ee8f248d BB	264	#ifdef CONFIG_HIGHMEM
	265	phys_addr_t phys;
	266	#endif
53ba51d2 JT	267	};
53ba51d2 JT	268
bf50bab2	269	struct page alloc_huge_page_node(struct hstate h, int nid);
74060e4d NH	270	struct page alloc_huge_page_noerr(struct vm_area_struct vma,
74060e4d NH	271	unsigned long addr, int avoid_reserve);
bf50bab2	272
53ba51d2 JT	273	/* arch callback */
	274	int __init alloc_bootmem_huge_page(struct hstate *h);
	275
e5ff2159 AK	276	void __init hugetlb_add_hstate(unsigned order);
	277	struct hstate *size_to_hstate(unsigned long size);
	278
	279	#ifndef HUGE_MAX_HSTATE
	280	#define HUGE_MAX_HSTATE 1
	281	#endif
	282
	283	extern struct hstate hstates[HUGE_MAX_HSTATE];
	284	extern unsigned int default_hstate_idx;
	285
	286	#define default_hstate (hstates[default_hstate_idx])
a5516438	287
a137e1cc	288	static inline struct hstate hstate_inode(struct inode i)
a5516438	289	{
a137e1cc AK	290	struct hugetlbfs_sb_info *hsb;
	291	hsb = HUGETLBFS_SB(i->i_sb);
	292	return hsb->hstate;
a5516438 AK	293	}
	294
	295	static inline struct hstate hstate_file(struct file f)
	296	{
496ad9aa	297	return hstate_inode(file_inode(f));
a5516438 AK	298	}
a5516438 AK	299
af73e4d9 NH	300	static inline struct hstate *hstate_sizelog(int page_size_log)
	301	{
	302	if (!page_size_log)
	303	return &default_hstate;
	304	return size_to_hstate(1 << page_size_log);
	305	}
	306
a137e1cc	307	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	308	{
a137e1cc	309	return hstate_file(vma->vm_file);
a5516438 AK	310	}
	311
	312	static inline unsigned long huge_page_size(struct hstate *h)
	313	{
	314	return (unsigned long)PAGE_SIZE << h->order;
	315	}
	316
08fba699 MG	317	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	318
3340289d MG	319	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	320
a5516438 AK	321	static inline unsigned long huge_page_mask(struct hstate *h)
	322	{
	323	return h->mask;
	324	}
	325
	326	static inline unsigned int huge_page_order(struct hstate *h)
	327	{
	328	return h->order;
	329	}
	330
	331	static inline unsigned huge_page_shift(struct hstate *h)
	332	{
	333	return h->order + PAGE_SHIFT;
	334	}
	335
	336	static inline unsigned int pages_per_huge_page(struct hstate *h)
	337	{
	338	return 1 << h->order;
	339	}
	340
	341	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	342	{
	343	return huge_page_size(h) / 512;
	344	}
	345
	346	#include <asm/hugetlb.h>
	347
d9ed9faa CM	348	#ifndef arch_make_huge_pte
	349	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	350	struct page *page, int writable)
	351	{
	352	return entry;
	353	}
	354	#endif
	355
e5ff2159 AK	356	static inline struct hstate page_hstate(struct page page)
e5ff2159 AK	357	{
309381fe	358	VM_BUG_ON_PAGE(!PageHuge(page), page);
e5ff2159 AK	359	return size_to_hstate(PAGE_SIZE << compound_order(page));
	360	}
	361
aa50d3a7 AK	362	static inline unsigned hstate_index_to_shift(unsigned index)
	363	{
	364	return hstates[index].order + PAGE_SHIFT;
	365	}
	366
972dc4de AK	367	static inline int hstate_index(struct hstate *h)
	368	{
	369	return h - hstates;
	370	}
	371
13d60f4b ZY	372	pgoff_t __basepage_index(struct page *page);
	373
	374	/* Return page->index in PAGE_SIZE units */
	375	static inline pgoff_t basepage_index(struct page *page)
	376	{
	377	if (!PageCompound(page))
	378	return page->index;
	379
	380	return __basepage_index(page);
	381	}
	382
c8721bbb NH	383	extern void dissolve_free_huge_pages(unsigned long start_pfn,
c8721bbb NH	384	unsigned long end_pfn);
83467efb NH	385	int pmd_huge_support(void);
	386	/*
	387	* Currently hugepage migration is enabled only for pmd-based hugepage.
	388	* This function will be updated when hugepage migration is more widely
	389	* supported.
	390	*/
	391	static inline int hugepage_migration_support(struct hstate *h)
	392	{
	393	return pmd_huge_support() && (huge_page_shift(h) == PMD_SHIFT);
	394	}
c8721bbb	395
cb900f41 KS	396	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	397	struct mm_struct mm, pte_t pte)
	398	{
	399	if (huge_page_size(h) == PMD_SIZE)
	400	return pmd_lockptr(mm, (pmd_t *) pte);
	401	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	402	return &mm->page_table_lock;
	403	}
	404
af73e4d9	405	#else /* CONFIG_HUGETLB_PAGE */
a5516438	406	struct hstate {};
bf50bab2	407	#define alloc_huge_page_node(h, nid) NULL
74060e4d	408	#define alloc_huge_page_noerr(v, a, r) NULL
53ba51d2	409	#define alloc_bootmem_huge_page(h) NULL
a5516438	410	#define hstate_file(f) NULL
af73e4d9	411	#define hstate_sizelog(s) NULL
a5516438 AK	412	#define hstate_vma(v) NULL
a5516438 AK	413	#define hstate_inode(i) NULL
cb900f41	414	#define page_hstate(page) NULL
a5516438 AK	415	#define huge_page_size(h) PAGE_SIZE
a5516438 AK	416	#define huge_page_mask(h) PAGE_MASK
08fba699	417	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	418	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	419	#define huge_page_order(h) 0
a5516438 AK	420	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	421	static inline unsigned int pages_per_huge_page(struct hstate *h)
	422	{
	423	return 1;
	424	}
aa50d3a7	425	#define hstate_index_to_shift(index) 0
972dc4de	426	#define hstate_index(h) 0
13d60f4b ZY	427
	428	static inline pgoff_t basepage_index(struct page *page)
	429	{
	430	return page->index;
	431	}
c8721bbb	432	#define dissolve_free_huge_pages(s, e) do {} while (0)
83467efb NH	433	#define pmd_huge_support() 0
83467efb NH	434	#define hugepage_migration_support(h) 0
cb900f41 KS	435
	436	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	437	struct mm_struct mm, pte_t pte)
	438	{
	439	return &mm->page_table_lock;
	440	}
af73e4d9	441	#endif /* CONFIG_HUGETLB_PAGE */
a5516438	442
cb900f41 KS	443	static inline spinlock_t huge_pte_lock(struct hstate h,
	444	struct mm_struct mm, pte_t pte)
	445	{
	446	spinlock_t *ptl;
	447
	448	ptl = huge_pte_lockptr(h, mm, pte);
	449	spin_lock(ptl);
	450	return ptl;
	451	}
	452
1da177e4	453	#endif /* _LINUX_HUGETLB_H */