[linux-2.6-block.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);
void copy_huge_page(struct page *dst, struct page *src);

#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 void copy_huge_page(struct page *dst, struct page *src)
{
}

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);

/* 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)
{
	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);
}

#else	/* CONFIG_HUGETLB_PAGE */
struct hstate {};
#define alloc_huge_page_node(h, nid) 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 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;
}
#endif	/* CONFIG_HUGETLB_PAGE */

#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);
0ebabb41	69	void copy_huge_page(struct page dst, struct page src);
1da177e4	70
3212b535 SC	71	#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
	72	pte_t huge_pmd_share(struct mm_struct mm, unsigned long addr, pud_t *pud);
	73	#endif
	74
396faf03	75	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	76	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	77	extern int sysctl_hugetlb_shm_group;
53ba51d2	78	extern struct list_head huge_boot_pages;
1da177e4	79
63551ae0 DG	80	/* arch callbacks */
63551ae0 DG	81
a5516438 AK	82	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	83	unsigned long addr, unsigned long sz);
63551ae0	84	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	85	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	86	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	87	int write);
	88	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	89	pmd_t *pmd, int write);
ceb86879 AK	90	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	91	pud_t *pud, int write);
63551ae0	92	int pmd_huge(pmd_t pmd);
ceb86879	93	int pud_huge(pud_t pmd);
7da4d641	94	unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
8f860591	95	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	96
1da177e4 LT	97	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	98
20a0307c WF	99	static inline int PageHuge(struct page *page)
	100	{
	101	return 0;
	102	}
	103
a1e78772 MG	104	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	105	{
	106	}
	107
1da177e4 LT	108	static inline unsigned long hugetlb_total_pages(void)
	109	{
	110	return 0;
	111	}
	112
5b23dbe8	113	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	114	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
1da177e4 LT	115	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
e1759c21 AD	116	static inline void hugetlb_report_meminfo(struct seq_file *m)
	117	{
	118	}
1da177e4	119	#define hugetlb_report_node_meminfo(n, buf) 0
949f7ec5 DR	120	static inline void hugetlb_show_meminfo(void)
	121	{
	122	}
1da177e4	123	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	124	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	125	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	126	#define pmd_huge(x) 0
ceb86879	127	#define pud_huge(x) 0
1da177e4	128	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	129	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	130	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	131	#define huge_pte_offset(mm, address) 0
24669e58 AK	132	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	133	{
	134	return 0;
	135	}
	136
0ebabb41 NH	137	static inline void copy_huge_page(struct page dst, struct page src)
	138	{
	139	}
1da177e4	140
7da4d641 PZ	141	static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	142	unsigned long address, unsigned long end, pgprot_t newprot)
	143	{
	144	return 0;
	145	}
8f860591	146
d833352a MG	147	static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	148	struct vm_area_struct *vma, unsigned long start,
	149	unsigned long end, struct page *ref_page)
	150	{
	151	BUG();
	152	}
	153
24669e58 AK	154	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	155	struct vm_area_struct *vma, unsigned long start,
	156	unsigned long end, struct page *ref_page)
	157	{
	158	BUG();
	159	}
	160
1da177e4 LT	161	#endif /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	162
4e52780d EM	163	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	164
6bfde05b EM	165	enum {
	166	/*
	167	* The file will be used as an shm file so shmfs accounting rules
	168	* apply
	169	*/
	170	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	171	/*
	172	* The file is being created on the internal vfs mount and shmfs
	173	* accounting rules do not apply
	174	*/
	175	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	176	};
6bfde05b EM	177
1da177e4	178	#ifdef CONFIG_HUGETLBFS
1da177e4	179	struct hugetlbfs_sb_info {
1da177e4 LT	180	long max_inodes; /* inodes allowed */
	181	long free_inodes; /* inodes free */
	182	spinlock_t stat_lock;
a137e1cc	183	struct hstate *hstate;
90481622	184	struct hugepage_subpool *spool;
1da177e4 LT	185	};
1da177e4 LT	186
1da177e4 LT	187	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	188	{
	189	return sb->s_fs_info;
	190	}
	191
4b6f5d20	192	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	193	extern const struct vm_operations_struct hugetlb_vm_ops;
af73e4d9	194	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
42d7395f AK	195	struct user_struct **user, int creat_flags,
42d7395f AK	196	int page_size_log);
1da177e4 LT	197
	198	static inline int is_file_hugepages(struct file *file)
	199	{
516dffdc AL	200	if (file->f_op == &hugetlbfs_file_operations)
	201	return 1;
	202	if (is_file_shm_hugepages(file))
	203	return 1;
	204
	205	return 0;
1da177e4 LT	206	}
1da177e4 LT	207
42d7395f	208
1da177e4 LT	209	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	210
1db8508c	211	#define is_file_hugepages(file) 0
40716e29	212	static inline struct file *
af73e4d9 NH	213	hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
af73e4d9 NH	214	struct user_struct **user, int creat_flags,
42d7395f	215	int page_size_log)
e9ea0e2d AM	216	{
	217	return ERR_PTR(-ENOSYS);
	218	}
1da177e4 LT	219
	220	#endif /* !CONFIG_HUGETLBFS */
	221
d2ba27e8 AB	222	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	223	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	224	unsigned long len, unsigned long pgoff,
	225	unsigned long flags);
	226	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	227
a5516438 AK	228	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	229
a3437870	230	#define HSTATE_NAME_LEN 32
a5516438 AK	231	/* Defines one hugetlb page size */
a5516438 AK	232	struct hstate {
e8c5c824 LS	233	int next_nid_to_alloc;
e8c5c824 LS	234	int next_nid_to_free;
a5516438 AK	235	unsigned int order;
	236	unsigned long mask;
	237	unsigned long max_huge_pages;
	238	unsigned long nr_huge_pages;
	239	unsigned long free_huge_pages;
	240	unsigned long resv_huge_pages;
	241	unsigned long surplus_huge_pages;
	242	unsigned long nr_overcommit_huge_pages;
0edaecfa	243	struct list_head hugepage_activelist;
a5516438 AK	244	struct list_head hugepage_freelists[MAX_NUMNODES];
	245	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	246	unsigned int free_huge_pages_node[MAX_NUMNODES];
	247	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
abb8206c AK	248	#ifdef CONFIG_CGROUP_HUGETLB
	249	/* cgroup control files */
	250	struct cftype cgroup_files[5];
	251	#endif
a3437870	252	char name[HSTATE_NAME_LEN];
a5516438 AK	253	};
a5516438 AK	254
53ba51d2 JT	255	struct huge_bootmem_page {
	256	struct list_head list;
	257	struct hstate *hstate;
ee8f248d BB	258	#ifdef CONFIG_HIGHMEM
	259	phys_addr_t phys;
	260	#endif
53ba51d2 JT	261	};
53ba51d2 JT	262
bf50bab2 NH	263	struct page alloc_huge_page_node(struct hstate h, int nid);
bf50bab2 NH	264
53ba51d2 JT	265	/* arch callback */
	266	int __init alloc_bootmem_huge_page(struct hstate *h);
	267
e5ff2159 AK	268	void __init hugetlb_add_hstate(unsigned order);
	269	struct hstate *size_to_hstate(unsigned long size);
	270
	271	#ifndef HUGE_MAX_HSTATE
	272	#define HUGE_MAX_HSTATE 1
	273	#endif
	274
	275	extern struct hstate hstates[HUGE_MAX_HSTATE];
	276	extern unsigned int default_hstate_idx;
	277
	278	#define default_hstate (hstates[default_hstate_idx])
a5516438	279
a137e1cc	280	static inline struct hstate hstate_inode(struct inode i)
a5516438	281	{
a137e1cc AK	282	struct hugetlbfs_sb_info *hsb;
	283	hsb = HUGETLBFS_SB(i->i_sb);
	284	return hsb->hstate;
a5516438 AK	285	}
	286
	287	static inline struct hstate hstate_file(struct file f)
	288	{
496ad9aa	289	return hstate_inode(file_inode(f));
a5516438 AK	290	}
a5516438 AK	291
af73e4d9 NH	292	static inline struct hstate *hstate_sizelog(int page_size_log)
	293	{
	294	if (!page_size_log)
	295	return &default_hstate;
	296	return size_to_hstate(1 << page_size_log);
	297	}
	298
a137e1cc	299	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	300	{
a137e1cc	301	return hstate_file(vma->vm_file);
a5516438 AK	302	}
	303
	304	static inline unsigned long huge_page_size(struct hstate *h)
	305	{
	306	return (unsigned long)PAGE_SIZE << h->order;
	307	}
	308
08fba699 MG	309	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	310
3340289d MG	311	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	312
a5516438 AK	313	static inline unsigned long huge_page_mask(struct hstate *h)
	314	{
	315	return h->mask;
	316	}
	317
	318	static inline unsigned int huge_page_order(struct hstate *h)
	319	{
	320	return h->order;
	321	}
	322
	323	static inline unsigned huge_page_shift(struct hstate *h)
	324	{
	325	return h->order + PAGE_SHIFT;
	326	}
	327
	328	static inline unsigned int pages_per_huge_page(struct hstate *h)
	329	{
	330	return 1 << h->order;
	331	}
	332
	333	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	334	{
	335	return huge_page_size(h) / 512;
	336	}
	337
	338	#include <asm/hugetlb.h>
	339
d9ed9faa CM	340	#ifndef arch_make_huge_pte
	341	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	342	struct page *page, int writable)
	343	{
	344	return entry;
	345	}
	346	#endif
	347
e5ff2159 AK	348	static inline struct hstate page_hstate(struct page page)
	349	{
	350	return size_to_hstate(PAGE_SIZE << compound_order(page));
	351	}
	352
aa50d3a7 AK	353	static inline unsigned hstate_index_to_shift(unsigned index)
	354	{
	355	return hstates[index].order + PAGE_SHIFT;
	356	}
	357
972dc4de AK	358	static inline int hstate_index(struct hstate *h)
	359	{
	360	return h - hstates;
	361	}
	362
13d60f4b ZY	363	pgoff_t __basepage_index(struct page *page);
	364
	365	/* Return page->index in PAGE_SIZE units */
	366	static inline pgoff_t basepage_index(struct page *page)
	367	{
	368	if (!PageCompound(page))
	369	return page->index;
	370
	371	return __basepage_index(page);
	372	}
	373
af73e4d9	374	#else /* CONFIG_HUGETLB_PAGE */
a5516438	375	struct hstate {};
bf50bab2	376	#define alloc_huge_page_node(h, nid) NULL
53ba51d2	377	#define alloc_bootmem_huge_page(h) NULL
a5516438	378	#define hstate_file(f) NULL
af73e4d9	379	#define hstate_sizelog(s) NULL
a5516438 AK	380	#define hstate_vma(v) NULL
	381	#define hstate_inode(i) NULL
	382	#define huge_page_size(h) PAGE_SIZE
	383	#define huge_page_mask(h) PAGE_MASK
08fba699	384	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	385	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	386	#define huge_page_order(h) 0
a5516438 AK	387	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	388	static inline unsigned int pages_per_huge_page(struct hstate *h)
	389	{
	390	return 1;
	391	}
aa50d3a7	392	#define hstate_index_to_shift(index) 0
972dc4de	393	#define hstate_index(h) 0
13d60f4b ZY	394
	395	static inline pgoff_t basepage_index(struct page *page)
	396	{
	397	return page->index;
	398	}
af73e4d9	399	#endif /* CONFIG_HUGETLB_PAGE */
a5516438	400
1da177e4	401	#endif /* _LINUX_HUGETLB_H */