[deliverable/linux.git] / include / linux / hugetlb.h

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/mm_types.h>
#include <linux/mmdebug.h>
#include <linux/fs.h>
#include <linux/hugetlb_inline.h>
#include <linux/cgroup.h>
#include <linux/list.h>
#include <linux/kref.h>

struct ctl_table;
struct user_struct;
struct mmu_gather;

#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mempolicy.h>
#include <linux/shm.h>
#include <asm/tlbflush.h>

struct hugepage_subpool {
	spinlock_t lock;
	long count;
	long max_hpages, used_hpages;
};

struct resv_map {
	struct kref refs;
	struct list_head regions;
};
extern struct resv_map *resv_map_alloc(void);
void resv_map_release(struct kref *ref);

extern spinlock_t hugetlb_lock;
extern int hugetlb_max_hstate __read_mostly;
#define for_each_hstate(h) \
	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)

struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
void hugepage_put_subpool(struct hugepage_subpool *spool);

int PageHuge(struct page *page);

void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);

#ifdef CONFIG_NUMA
int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
					void __user *, size_t *, loff_t *);
#endif

int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			 struct page **, struct vm_area_struct **,
			 unsigned long *, unsigned long *, long, unsigned int);
void unmap_hugepage_range(struct vm_area_struct *,
			  unsigned long, unsigned long, struct page *);
void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			  struct vm_area_struct *vma,
			  unsigned long start, unsigned long end,
			  struct page *ref_page);
void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
				unsigned long start, unsigned long end,
				struct page *ref_page);
void hugetlb_report_meminfo(struct seq_file *);
int hugetlb_report_node_meminfo(int, char *);
void hugetlb_show_meminfo(void);
unsigned long hugetlb_total_pages(void);
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
			unsigned long address, unsigned int flags);
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
						struct vm_area_struct *vma,
						vm_flags_t vm_flags);
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
int dequeue_hwpoisoned_huge_page(struct page *page);
bool isolate_huge_page(struct page *page, struct list_head *list);
void putback_active_hugepage(struct page *page);
bool is_hugepage_active(struct page *page);

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

extern unsigned long hugepages_treat_as_movable;
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
extern struct list_head huge_boot_pages;

/* arch callbacks */

pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
			      int write);
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
				pmd_t *pmd, int write);
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int write);
int pmd_huge(pmd_t pmd);
int pud_huge(pud_t pmd);
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot);

#else /* !CONFIG_HUGETLB_PAGE */

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

static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
#define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
#define hugetlb_report_node_meminfo(n, buf)	0
static inline void hugetlb_show_meminfo(void)
{
}
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
#define follow_huge_pud(mm, addr, pud, write)	NULL
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
#define pmd_huge(x)	0
#define pud_huge(x)	0
#define is_hugepage_only_range(mm, addr, len)	0
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
#define huge_pte_offset(mm, address)	0
static inline int dequeue_hwpoisoned_huge_page(struct page *page)
{
	return 0;
}

static inline bool isolate_huge_page(struct page *page, struct list_head *list)
{
	return false;
}
#define putback_active_hugepage(p)	do {} while (0)
#define is_hugepage_active(x)	false

static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot)
{
	return 0;
}

static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			struct vm_area_struct *vma, unsigned long start,
			unsigned long end, struct page *ref_page)
{
	BUG();
}

static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
			struct vm_area_struct *vma, unsigned long start,
			unsigned long end, struct page *ref_page)
{
	BUG();
}

#endif /* !CONFIG_HUGETLB_PAGE */

#define HUGETLB_ANON_FILE "anon_hugepage"

enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
};

#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
	struct hstate *hstate;
	struct hugepage_subpool *spool;
};

static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

extern const struct file_operations hugetlbfs_file_operations;
extern const struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
				struct user_struct **user, int creat_flags,
				int page_size_log);

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

	return 0;
}


#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)			0
static inline struct file *
hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
		struct user_struct **user, int creat_flags,
		int page_size_log)
{
	return ERR_PTR(-ENOSYS);
}

#endif /* !CONFIG_HUGETLBFS */

#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
					unsigned long len, unsigned long pgoff,
					unsigned long flags);
#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */

#ifdef CONFIG_HUGETLB_PAGE

#define HSTATE_NAME_LEN 32
/* Defines one hugetlb page size */
struct hstate {
	int next_nid_to_alloc;
	int next_nid_to_free;
	unsigned int order;
	unsigned long mask;
	unsigned long max_huge_pages;
	unsigned long nr_huge_pages;
	unsigned long free_huge_pages;
	unsigned long resv_huge_pages;
	unsigned long surplus_huge_pages;
	unsigned long nr_overcommit_huge_pages;
	struct list_head hugepage_activelist;
	struct list_head hugepage_freelists[MAX_NUMNODES];
	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	unsigned int free_huge_pages_node[MAX_NUMNODES];
	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files[5];
#endif
	char name[HSTATE_NAME_LEN];
};

struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
#ifdef CONFIG_HIGHMEM
	phys_addr_t phys;
#endif
};

struct page *alloc_huge_page_node(struct hstate *h, int nid);
struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);

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

void __init hugetlb_add_hstate(unsigned order);
struct hstate *size_to_hstate(unsigned long size);

#ifndef HUGE_MAX_HSTATE
#define HUGE_MAX_HSTATE 1
#endif

extern struct hstate hstates[HUGE_MAX_HSTATE];
extern unsigned int default_hstate_idx;

#define default_hstate (hstates[default_hstate_idx])

static inline struct hstate *hstate_inode(struct inode *i)
{
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->hstate;
}

static inline struct hstate *hstate_file(struct file *f)
{
	return hstate_inode(file_inode(f));
}

static inline struct hstate *hstate_sizelog(int page_size_log)
{
	if (!page_size_log)
		return &default_hstate;
	return size_to_hstate(1 << page_size_log);
}

static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
{
	return hstate_file(vma->vm_file);
}

static inline unsigned long huge_page_size(struct hstate *h)
{
	return (unsigned long)PAGE_SIZE << h->order;
}

extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

static inline unsigned long huge_page_mask(struct hstate *h)
{
	return h->mask;
}

static inline unsigned int huge_page_order(struct hstate *h)
{
	return h->order;
}

static inline unsigned huge_page_shift(struct hstate *h)
{
	return h->order + PAGE_SHIFT;
}

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