[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;	/* Maximum huge pages or -1 if no maximum. */
	long used_hpages;	/* Used count against maximum, includes */
				/* both alloced and reserved pages. */
	struct hstate *hstate;
	long min_hpages;	/* Minimum huge pages or -1 if no minimum. */
	long rsv_hpages;	/* Pages reserved against global pool to */
				/* sasitfy minimum size. */
};

struct resv_map {
	struct kref refs;
	spinlock_t lock;
	struct list_head regions;
	long adds_in_progress;
	struct list_head region_cache;
	long region_cache_count;
};
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(struct hstate *h, long max_hpages,
						long min_hpages);
void hugepage_put_subpool(struct hugepage_subpool *spool);

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);
void free_huge_page(struct page *page);
extern struct mutex *hugetlb_fault_mutex_table;
u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
				struct vm_area_struct *vma,
				struct address_space *mapping,
				pgoff_t idx, unsigned long address);

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

extern int hugepages_treat_as_movable;
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 flags);
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int flags);
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 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, flags)	NULL
#define follow_huge_pud(mm, addr, pud, flags)	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)

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 */
/*
 * hugepages at page global directory. If arch support
 * hugepages at pgd level, they need to define this.
 */
#ifndef pgd_huge
#define pgd_huge(x)	0
#endif

#ifndef pgd_write
static inline int pgd_write(pgd_t pgd)
{
	BUG();
	return 0;
}
#endif

#ifndef pud_write
static inline int pud_write(pud_t pud)
{
	BUG();
	return 0;
}
#endif

#ifndef is_hugepd
/*
 * Some architectures requires a hugepage directory format that is
 * required to support multiple hugepage sizes. For example
 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
 * introduced the same on powerpc. This allows for a more flexible hugepage
 * pagetable layout.
 */
typedef struct { unsigned long pd; } hugepd_t;
#define is_hugepd(hugepd) (0)
#define __hugepd(x) ((hugepd_t) { (x) })
static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
			      unsigned pdshift, unsigned long end,
			      int write, struct page **pages, int *nr)
{
	return 0;
}
#else
extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
		       unsigned pdshift, unsigned long end,
		       int write, struct page **pages, int *nr);
#endif

#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(1UL << 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;
}

#ifndef hugepages_supported
/*
 * Some platform decide whether they support huge pages at boot
 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
 * when there is no such support
 */
#define hugepages_supported() (HPAGE_SHIFT != 0)
#endif

#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;
c6a91820 MK	25	long max_hpages; /* Maximum huge pages or -1 if no maximum. */
	26	long used_hpages; /* Used count against maximum, includes */
	27	/* both alloced and reserved pages. */
	28	struct hstate *hstate;
	29	long min_hpages; /* Minimum huge pages or -1 if no minimum. */
	30	long rsv_hpages; /* Pages reserved against global pool to */
	31	/* sasitfy minimum size. */
90481622 DG	32	};
90481622 DG	33
9119a41e JK	34	struct resv_map {
9119a41e JK	35	struct kref refs;
7b24d861	36	spinlock_t lock;
9119a41e	37	struct list_head regions;
5e911373 MK	38	long adds_in_progress;
	39	struct list_head region_cache;
	40	long region_cache_count;
9119a41e JK	41	};
	42	extern struct resv_map *resv_map_alloc(void);
	43	void resv_map_release(struct kref *ref);
	44
c3f38a38 AK	45	extern spinlock_t hugetlb_lock;
	46	extern int hugetlb_max_hstate __read_mostly;
	47	#define for_each_hstate(h) \
	48	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
	49
7ca02d0a MK	50	struct hugepage_subpool hugepage_new_subpool(struct hstate h, long max_hpages,
7ca02d0a MK	51	long min_hpages);
90481622 DG	52	void hugepage_put_subpool(struct hugepage_subpool *spool);
90481622 DG	53
a1e78772	54	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
8d65af78 AD	55	int hugetlb_sysctl_handler(struct ctl_table , int, void __user , size_t , loff_t );
	56	int hugetlb_overcommit_handler(struct ctl_table , int, void __user , size_t , loff_t );
	57	int hugetlb_treat_movable_handler(struct ctl_table , int, void __user , size_t , loff_t );
06808b08 LS	58
	59	#ifdef CONFIG_NUMA
	60	int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
	61	void __user , size_t , loff_t *);
	62	#endif
	63
1da177e4	64	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
28a35716 ML	65	long follow_hugetlb_page(struct mm_struct , struct vm_area_struct ,
	66	struct page , struct vm_area_struct ,
	67	unsigned long , unsigned long , long, unsigned int);
04f2cbe3	68	void unmap_hugepage_range(struct vm_area_struct *,
24669e58	69	unsigned long, unsigned long, struct page *);
d833352a MG	70	void __unmap_hugepage_range_final(struct mmu_gather *tlb,
	71	struct vm_area_struct *vma,
	72	unsigned long start, unsigned long end,
	73	struct page *ref_page);
24669e58 AK	74	void __unmap_hugepage_range(struct mmu_gather tlb, struct vm_area_struct vma,
	75	unsigned long start, unsigned long end,
	76	struct page *ref_page);
e1759c21	77	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	78	int hugetlb_report_node_meminfo(int, char *);
949f7ec5	79	void hugetlb_show_meminfo(void);
1da177e4	80	unsigned long hugetlb_total_pages(void);
ac9b9c66	81	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
788c7df4	82	unsigned long address, unsigned int flags);
a1e78772	83	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125	84	struct vm_area_struct *vma,
ca16d140	85	vm_flags_t vm_flags);
a43a8c39	86	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
6de2b1aa	87	int dequeue_hwpoisoned_huge_page(struct page *page);
31caf665 NH	88	bool isolate_huge_page(struct page page, struct list_head list);
31caf665 NH	89	void putback_active_hugepage(struct page *page);
8f1d26d0	90	void free_huge_page(struct page *page);
c672c7f2 MK	91	extern struct mutex *hugetlb_fault_mutex_table;
	92	u32 hugetlb_fault_mutex_hash(struct hstate h, struct mm_struct mm,
	93	struct vm_area_struct *vma,
	94	struct address_space *mapping,
	95	pgoff_t idx, unsigned long address);
1da177e4	96
3212b535 SC	97	#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
	98	pte_t huge_pmd_share(struct mm_struct mm, unsigned long addr, pud_t *pud);
	99	#endif
	100
753162cd	101	extern int hugepages_treat_as_movable;
1da177e4	102	extern int sysctl_hugetlb_shm_group;
53ba51d2	103	extern struct list_head huge_boot_pages;
1da177e4	104
63551ae0 DG	105	/* arch callbacks */
63551ae0 DG	106
a5516438 AK	107	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	108	unsigned long addr, unsigned long sz);
63551ae0	109	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	110	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	111	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	112	int write);
	113	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
e66f17ff	114	pmd_t *pmd, int flags);
ceb86879	115	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
e66f17ff	116	pud_t *pud, int flags);
63551ae0	117	int pmd_huge(pmd_t pmd);
ceb86879	118	int pud_huge(pud_t pmd);
7da4d641	119	unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
8f860591	120	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	121
1da177e4 LT	122	#else /* !CONFIG_HUGETLB_PAGE */
1da177e4 LT	123
a1e78772 MG	124	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	125	{
	126	}
	127
1da177e4 LT	128	static inline unsigned long hugetlb_total_pages(void)
	129	{
	130	return 0;
	131	}
	132
5b23dbe8	133	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	134	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
1da177e4 LT	135	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
e1759c21 AD	136	static inline void hugetlb_report_meminfo(struct seq_file *m)
	137	{
	138	}
1da177e4	139	#define hugetlb_report_node_meminfo(n, buf) 0
949f7ec5 DR	140	static inline void hugetlb_show_meminfo(void)
	141	{
	142	}
e66f17ff NH	143	#define follow_huge_pmd(mm, addr, pmd, flags) NULL
e66f17ff NH	144	#define follow_huge_pud(mm, addr, pud, flags) NULL
a5516438	145	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	146	#define pmd_huge(x) 0
ceb86879	147	#define pud_huge(x) 0
1da177e4	148	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	149	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
788c7df4	150	#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
0fe6e20b	151	#define huge_pte_offset(mm, address) 0
24669e58 AK	152	static inline int dequeue_hwpoisoned_huge_page(struct page *page)
	153	{
	154	return 0;
	155	}
	156
f40386a4 NH	157	static inline bool isolate_huge_page(struct page page, struct list_head list)
	158	{
	159	return false;
	160	}
31caf665	161	#define putback_active_hugepage(p) do {} while (0)
1da177e4	162
7da4d641 PZ	163	static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
	164	unsigned long address, unsigned long end, pgprot_t newprot)
	165	{
	166	return 0;
	167	}
8f860591	168
d833352a MG	169	static inline void __unmap_hugepage_range_final(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
24669e58 AK	176	static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
	177	struct vm_area_struct *vma, unsigned long start,
	178	unsigned long end, struct page *ref_page)
	179	{
	180	BUG();
	181	}
	182
1da177e4	183	#endif /* !CONFIG_HUGETLB_PAGE */
f30c59e9 AK	184	/*
	185	* hugepages at page global directory. If arch support
	186	* hugepages at pgd level, they need to define this.
	187	*/
	188	#ifndef pgd_huge
	189	#define pgd_huge(x) 0
	190	#endif
	191
	192	#ifndef pgd_write
	193	static inline int pgd_write(pgd_t pgd)
	194	{
	195	BUG();
	196	return 0;
	197	}
	198	#endif
	199
	200	#ifndef pud_write
	201	static inline int pud_write(pud_t pud)
	202	{
	203	BUG();
	204	return 0;
	205	}
	206	#endif
	207
	208	#ifndef is_hugepd
	209	/*
	210	* Some architectures requires a hugepage directory format that is
	211	* required to support multiple hugepage sizes. For example
	212	* a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
	213	* introduced the same on powerpc. This allows for a more flexible hugepage
	214	* pagetable layout.
	215	*/
	216	typedef struct { unsigned long pd; } hugepd_t;
	217	#define is_hugepd(hugepd) (0)
	218	#define __hugepd(x) ((hugepd_t) { (x) })
	219	static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
	220	unsigned pdshift, unsigned long end,
	221	int write, struct page *pages, int nr)
	222	{
	223	return 0;
	224	}
	225	#else
	226	extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
	227	unsigned pdshift, unsigned long end,
	228	int write, struct page *pages, int nr);
	229	#endif
1da177e4	230
4e52780d EM	231	#define HUGETLB_ANON_FILE "anon_hugepage"
4e52780d EM	232
6bfde05b EM	233	enum {
	234	/*
	235	* The file will be used as an shm file so shmfs accounting rules
	236	* apply
	237	*/
	238	HUGETLB_SHMFS_INODE = 1,
4e52780d EM	239	/*
	240	* The file is being created on the internal vfs mount and shmfs
	241	* accounting rules do not apply
	242	*/
	243	HUGETLB_ANONHUGE_INODE = 2,
6bfde05b EM	244	};
6bfde05b EM	245
1da177e4	246	#ifdef CONFIG_HUGETLBFS
1da177e4	247	struct hugetlbfs_sb_info {
1da177e4 LT	248	long max_inodes; /* inodes allowed */
	249	long free_inodes; /* inodes free */
	250	spinlock_t stat_lock;
a137e1cc	251	struct hstate *hstate;
90481622	252	struct hugepage_subpool *spool;
1da177e4 LT	253	};
1da177e4 LT	254
1da177e4 LT	255	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	256	{
	257	return sb->s_fs_info;
	258	}
	259
4b6f5d20	260	extern const struct file_operations hugetlbfs_file_operations;
f0f37e2f	261	extern const struct vm_operations_struct hugetlb_vm_ops;
af73e4d9	262	struct file hugetlb_file_setup(const char name, size_t size, vm_flags_t acct,
42d7395f AK	263	struct user_struct **user, int creat_flags,
42d7395f AK	264	int page_size_log);
1da177e4 LT	265
	266	static inline int is_file_hugepages(struct file *file)
	267	{
516dffdc AL	268	if (file->f_op == &hugetlbfs_file_operations)
	269	return 1;
	270	if (is_file_shm_hugepages(file))
	271	return 1;
	272
	273	return 0;
1da177e4 LT	274	}
1da177e4 LT	275
42d7395f	276
1da177e4 LT	277	#else /* !CONFIG_HUGETLBFS */
1da177e4 LT	278
1db8508c	279	#define is_file_hugepages(file) 0
40716e29	280	static inline struct file *
af73e4d9 NH	281	hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
af73e4d9 NH	282	struct user_struct **user, int creat_flags,
42d7395f	283	int page_size_log)
e9ea0e2d AM	284	{
	285	return ERR_PTR(-ENOSYS);
	286	}
1da177e4 LT	287
	288	#endif /* !CONFIG_HUGETLBFS */
	289
d2ba27e8 AB	290	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	291	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	292	unsigned long len, unsigned long pgoff,
	293	unsigned long flags);
	294	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	295
a5516438 AK	296	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	297
a3437870	298	#define HSTATE_NAME_LEN 32
a5516438 AK	299	/* Defines one hugetlb page size */
a5516438 AK	300	struct hstate {
e8c5c824 LS	301	int next_nid_to_alloc;
e8c5c824 LS	302	int next_nid_to_free;
a5516438 AK	303	unsigned int order;
	304	unsigned long mask;
	305	unsigned long max_huge_pages;
	306	unsigned long nr_huge_pages;
	307	unsigned long free_huge_pages;
	308	unsigned long resv_huge_pages;
	309	unsigned long surplus_huge_pages;
	310	unsigned long nr_overcommit_huge_pages;
0edaecfa	311	struct list_head hugepage_activelist;
a5516438 AK	312	struct list_head hugepage_freelists[MAX_NUMNODES];
	313	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	314	unsigned int free_huge_pages_node[MAX_NUMNODES];
	315	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
abb8206c AK	316	#ifdef CONFIG_CGROUP_HUGETLB
	317	/* cgroup control files */
	318	struct cftype cgroup_files[5];
	319	#endif
a3437870	320	char name[HSTATE_NAME_LEN];
a5516438 AK	321	};
a5516438 AK	322
53ba51d2 JT	323	struct huge_bootmem_page {
	324	struct list_head list;
	325	struct hstate *hstate;
ee8f248d BB	326	#ifdef CONFIG_HIGHMEM
	327	phys_addr_t phys;
	328	#endif
53ba51d2 JT	329	};
53ba51d2 JT	330
bf50bab2	331	struct page alloc_huge_page_node(struct hstate h, int nid);
74060e4d NH	332	struct page alloc_huge_page_noerr(struct vm_area_struct vma,
74060e4d NH	333	unsigned long addr, int avoid_reserve);
bf50bab2	334
53ba51d2 JT	335	/* arch callback */
	336	int __init alloc_bootmem_huge_page(struct hstate *h);
	337
e5ff2159 AK	338	void __init hugetlb_add_hstate(unsigned order);
	339	struct hstate *size_to_hstate(unsigned long size);
	340
	341	#ifndef HUGE_MAX_HSTATE
	342	#define HUGE_MAX_HSTATE 1
	343	#endif
	344
	345	extern struct hstate hstates[HUGE_MAX_HSTATE];
	346	extern unsigned int default_hstate_idx;
	347
	348	#define default_hstate (hstates[default_hstate_idx])
a5516438	349
a137e1cc	350	static inline struct hstate hstate_inode(struct inode i)
a5516438	351	{
a137e1cc AK	352	struct hugetlbfs_sb_info *hsb;
	353	hsb = HUGETLBFS_SB(i->i_sb);
	354	return hsb->hstate;
a5516438 AK	355	}
	356
	357	static inline struct hstate hstate_file(struct file f)
	358	{
496ad9aa	359	return hstate_inode(file_inode(f));
a5516438 AK	360	}
a5516438 AK	361
af73e4d9 NH	362	static inline struct hstate *hstate_sizelog(int page_size_log)
	363	{
	364	if (!page_size_log)
	365	return &default_hstate;
97ad2be1 SL	366
97ad2be1 SL	367	return size_to_hstate(1UL << page_size_log);
af73e4d9 NH	368	}
af73e4d9 NH	369
a137e1cc	370	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	371	{
a137e1cc	372	return hstate_file(vma->vm_file);
a5516438 AK	373	}
	374
	375	static inline unsigned long huge_page_size(struct hstate *h)
	376	{
	377	return (unsigned long)PAGE_SIZE << h->order;
	378	}
	379
08fba699 MG	380	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	381
3340289d MG	382	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	383
a5516438 AK	384	static inline unsigned long huge_page_mask(struct hstate *h)
	385	{
	386	return h->mask;
	387	}
	388
	389	static inline unsigned int huge_page_order(struct hstate *h)
	390	{
	391	return h->order;
	392	}
	393
	394	static inline unsigned huge_page_shift(struct hstate *h)
	395	{
	396	return h->order + PAGE_SHIFT;
	397	}
	398
bae7f4ae LC	399	static inline bool hstate_is_gigantic(struct hstate *h)
	400	{
	401	return huge_page_order(h) >= MAX_ORDER;
	402	}
	403
a5516438 AK	404	static inline unsigned int pages_per_huge_page(struct hstate *h)
	405	{
	406	return 1 << h->order;
	407	}
	408
	409	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	410	{
	411	return huge_page_size(h) / 512;
	412	}
	413
	414	#include <asm/hugetlb.h>
	415
d9ed9faa CM	416	#ifndef arch_make_huge_pte
	417	static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
	418	struct page *page, int writable)
	419	{
	420	return entry;
	421	}
	422	#endif
	423
e5ff2159 AK	424	static inline struct hstate page_hstate(struct page page)
e5ff2159 AK	425	{
309381fe	426	VM_BUG_ON_PAGE(!PageHuge(page), page);
e5ff2159 AK	427	return size_to_hstate(PAGE_SIZE << compound_order(page));
	428	}
	429
aa50d3a7 AK	430	static inline unsigned hstate_index_to_shift(unsigned index)
	431	{
	432	return hstates[index].order + PAGE_SHIFT;
	433	}
	434
972dc4de AK	435	static inline int hstate_index(struct hstate *h)
	436	{
	437	return h - hstates;
	438	}
	439
13d60f4b ZY	440	pgoff_t __basepage_index(struct page *page);
	441
	442	/* Return page->index in PAGE_SIZE units */
	443	static inline pgoff_t basepage_index(struct page *page)
	444	{
	445	if (!PageCompound(page))
	446	return page->index;
	447
	448	return __basepage_index(page);
	449	}
	450
c8721bbb NH	451	extern void dissolve_free_huge_pages(unsigned long start_pfn,
c8721bbb NH	452	unsigned long end_pfn);
100873d7	453	static inline int hugepage_migration_supported(struct hstate *h)
83467efb	454	{
c177c81e NH	455	#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	456	return huge_page_shift(h) == PMD_SHIFT;
	457	#else
	458	return 0;
	459	#endif
83467efb	460	}
c8721bbb	461
cb900f41 KS	462	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	463	struct mm_struct mm, pte_t pte)
	464	{
	465	if (huge_page_size(h) == PMD_SIZE)
	466	return pmd_lockptr(mm, (pmd_t *) pte);
	467	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	468	return &mm->page_table_lock;
	469	}
	470
2531c8cf DD	471	#ifndef hugepages_supported
	472	/*
	473	* Some platform decide whether they support huge pages at boot
	474	* time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
	475	* when there is no such support
	476	*/
	477	#define hugepages_supported() (HPAGE_SHIFT != 0)
	478	#endif
457c1b27	479
af73e4d9	480	#else /* CONFIG_HUGETLB_PAGE */
a5516438	481	struct hstate {};
bf50bab2	482	#define alloc_huge_page_node(h, nid) NULL
74060e4d	483	#define alloc_huge_page_noerr(v, a, r) NULL
53ba51d2	484	#define alloc_bootmem_huge_page(h) NULL
a5516438	485	#define hstate_file(f) NULL
af73e4d9	486	#define hstate_sizelog(s) NULL
a5516438 AK	487	#define hstate_vma(v) NULL
a5516438 AK	488	#define hstate_inode(i) NULL
cb900f41	489	#define page_hstate(page) NULL
a5516438 AK	490	#define huge_page_size(h) PAGE_SIZE
a5516438 AK	491	#define huge_page_mask(h) PAGE_MASK
08fba699	492	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	493	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	494	#define huge_page_order(h) 0
a5516438 AK	495	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	496	static inline unsigned int pages_per_huge_page(struct hstate *h)
	497	{
	498	return 1;
	499	}
aa50d3a7	500	#define hstate_index_to_shift(index) 0
972dc4de	501	#define hstate_index(h) 0
13d60f4b ZY	502
	503	static inline pgoff_t basepage_index(struct page *page)
	504	{
	505	return page->index;
	506	}
c8721bbb	507	#define dissolve_free_huge_pages(s, e) do {} while (0)
100873d7	508	#define hugepage_migration_supported(h) 0
cb900f41 KS	509
	510	static inline spinlock_t huge_pte_lockptr(struct hstate h,
	511	struct mm_struct mm, pte_t pte)
	512	{
	513	return &mm->page_table_lock;
	514	}
af73e4d9	515	#endif /* CONFIG_HUGETLB_PAGE */
a5516438	516
cb900f41 KS	517	static inline spinlock_t huge_pte_lock(struct hstate h,
	518	struct mm_struct mm, pte_t pte)
	519	{
	520	spinlock_t *ptl;
	521
	522	ptl = huge_pte_lockptr(h, mm, pte);
	523	spin_lock(ptl);
	524	return ptl;
	525	}
	526
1da177e4	527	#endif /* _LINUX_HUGETLB_H */