[linux-2.6-block.git] / include / linux / hugetlb.h

#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

#include <linux/fs.h>

#ifdef CONFIG_HUGETLB_PAGE

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

struct ctl_table;

static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
{
	return vma->vm_flags & VM_HUGETLB;
}

void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
void unmap_hugepage_range(struct vm_area_struct *,
			unsigned long, unsigned long, struct page *);
void __unmap_hugepage_range(struct vm_area_struct *,
			unsigned long, unsigned long, struct page *);
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
void hugetlb_report_meminfo(struct seq_file *);
int hugetlb_report_node_meminfo(int, char *);
unsigned long hugetlb_total_pages(void);
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
			unsigned long address, int write_access);
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
						struct vm_area_struct *vma,
						int acctflags);
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);

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);
void hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot);

#else /* !CONFIG_HUGETLB_PAGE */

static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
{
	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; })
#define hugetlb_prefault(mapping, vma)		({ BUG(); 0; })
#define unmap_hugepage_range(vma, start, end, page)	BUG()
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
#define hugetlb_report_node_meminfo(n, buf)	0
#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, write)	({ BUG(); 0; })

#define hugetlb_change_protection(vma, address, end, newprot)

#ifndef HPAGE_MASK
#define HPAGE_MASK	PAGE_MASK		/* Keep the compiler happy */
#define HPAGE_SIZE	PAGE_SIZE
#endif

#endif /* !CONFIG_HUGETLB_PAGE */

#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_config {
	uid_t   uid;
	gid_t   gid;
	umode_t mode;
	long	nr_blocks;
	long	nr_inodes;
	struct hstate *hstate;
};

struct hugetlbfs_sb_info {
	long	max_blocks;   /* blocks allowed */
	long	free_blocks;  /* blocks free */
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
	struct hstate *hstate;
};


struct hugetlbfs_inode_info {
	struct shared_policy policy;
	struct inode vfs_inode;
};

static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
{
	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
}

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 struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_file_setup(const char *name, size_t, int);
int hugetlb_get_quota(struct address_space *mapping, long delta);
void hugetlb_put_quota(struct address_space *mapping, long delta);

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;
}

static inline void set_file_hugepages(struct file *file)
{
	file->f_op = &hugetlbfs_file_operations;
}
#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)			0
#define set_file_hugepages(file)		BUG()
#define hugetlb_file_setup(name,size,acctflag)	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 hugetlb_next_nid;
	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_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];
	char name[HSTATE_NAME_LEN];
};

struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
};

/* 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(f->f_dentry->d_inode);
}

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>

static inline struct hstate *page_hstate(struct page *page)
{
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

#else
struct hstate {};
#define alloc_bootmem_huge_page(h) NULL
#define hstate_file(f) 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;
}
#endif

#endif /* _LINUX_HUGETLB_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_HUGETLB_H
	2	#define _LINUX_HUGETLB_H
	3
4e950f6f AD	4	#include <linux/fs.h>
4e950f6f AD	5
1da177e4 LT	6	#ifdef CONFIG_HUGETLB_PAGE
	7
	8	#include <linux/mempolicy.h>
516dffdc	9	#include <linux/shm.h>
63551ae0	10	#include <asm/tlbflush.h>
1da177e4 LT	11
	12	struct ctl_table;
	13
	14	static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
	15	{
	16	return vma->vm_flags & VM_HUGETLB;
	17	}
	18
a1e78772	19	void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
1da177e4	20	int hugetlb_sysctl_handler(struct ctl_table , int, struct file , void __user , size_t , loff_t *);
a3d0c6aa	21	int hugetlb_overcommit_handler(struct ctl_table , int, struct file , void __user , size_t , loff_t *);
396faf03	22	int hugetlb_treat_movable_handler(struct ctl_table , int, struct file , void __user , size_t , loff_t *);
1da177e4	23	int copy_hugetlb_page_range(struct mm_struct , struct mm_struct , struct vm_area_struct *);
5b23dbe8	24	int follow_hugetlb_page(struct mm_struct , struct vm_area_struct , struct page , struct vm_area_struct , unsigned long , int , int, int);
04f2cbe3 MG	25	void unmap_hugepage_range(struct vm_area_struct *,
	26	unsigned long, unsigned long, struct page *);
	27	void __unmap_hugepage_range(struct vm_area_struct *,
	28	unsigned long, unsigned long, struct page *);
1da177e4	29	int hugetlb_prefault(struct address_space , struct vm_area_struct );
e1759c21	30	void hugetlb_report_meminfo(struct seq_file *);
1da177e4	31	int hugetlb_report_node_meminfo(int, char *);
1da177e4	32	unsigned long hugetlb_total_pages(void);
ac9b9c66 HD	33	int hugetlb_fault(struct mm_struct mm, struct vm_area_struct vma,
ac9b9c66 HD	34	unsigned long address, int write_access);
a1e78772	35	int hugetlb_reserve_pages(struct inode *inode, long from, long to,
5a6fe125 MG	36	struct vm_area_struct *vma,
5a6fe125 MG	37	int acctflags);
a43a8c39	38	void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
1da177e4	39
396faf03	40	extern unsigned long hugepages_treat_as_movable;
1da177e4 LT	41	extern const unsigned long hugetlb_zero, hugetlb_infinity;
1da177e4 LT	42	extern int sysctl_hugetlb_shm_group;
53ba51d2	43	extern struct list_head huge_boot_pages;
1da177e4	44
63551ae0 DG	45	/* arch callbacks */
63551ae0 DG	46
a5516438 AK	47	pte_t huge_pte_alloc(struct mm_struct mm,
a5516438 AK	48	unsigned long addr, unsigned long sz);
63551ae0	49	pte_t huge_pte_offset(struct mm_struct mm, unsigned long addr);
39dde65c	50	int huge_pmd_unshare(struct mm_struct mm, unsigned long addr, pte_t *ptep);
63551ae0 DG	51	struct page follow_huge_addr(struct mm_struct mm, unsigned long address,
	52	int write);
	53	struct page follow_huge_pmd(struct mm_struct mm, unsigned long address,
	54	pmd_t *pmd, int write);
ceb86879 AK	55	struct page follow_huge_pud(struct mm_struct mm, unsigned long address,
ceb86879 AK	56	pud_t *pud, int write);
63551ae0	57	int pmd_huge(pmd_t pmd);
ceb86879	58	int pud_huge(pud_t pmd);
8f860591 ZY	59	void hugetlb_change_protection(struct vm_area_struct *vma,
8f860591 ZY	60	unsigned long address, unsigned long end, pgprot_t newprot);
63551ae0	61
1da177e4 LT	62	#else /* !CONFIG_HUGETLB_PAGE */
	63
	64	static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
	65	{
	66	return 0;
	67	}
a1e78772 MG	68
	69	static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
	70	{
	71	}
	72
1da177e4 LT	73	static inline unsigned long hugetlb_total_pages(void)
	74	{
	75	return 0;
	76	}
	77
5b23dbe8	78	#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
1da177e4 LT	79	#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
	80	#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
	81	#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
04f2cbe3	82	#define unmap_hugepage_range(vma, start, end, page) BUG()
e1759c21 AD	83	static inline void hugetlb_report_meminfo(struct seq_file *m)
	84	{
	85	}
1da177e4 LT	86	#define hugetlb_report_node_meminfo(n, buf) 0
1da177e4 LT	87	#define follow_huge_pmd(mm, addr, pmd, write) NULL
ceb86879	88	#define follow_huge_pud(mm, addr, pud, write) NULL
a5516438	89	#define prepare_hugepage_range(file, addr, len) (-EINVAL)
1da177e4	90	#define pmd_huge(x) 0
ceb86879	91	#define pud_huge(x) 0
1da177e4	92	#define is_hugepage_only_range(mm, addr, len) 0
9da61aef	93	#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
ac9b9c66	94	#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
1da177e4	95
8f860591 ZY	96	#define hugetlb_change_protection(vma, address, end, newprot)
8f860591 ZY	97
1da177e4	98	#ifndef HPAGE_MASK
51c6f666 RH	99	#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
51c6f666 RH	100	#define HPAGE_SIZE PAGE_SIZE
1da177e4 LT	101	#endif
	102
	103	#endif /* !CONFIG_HUGETLB_PAGE */
	104
	105	#ifdef CONFIG_HUGETLBFS
	106	struct hugetlbfs_config {
	107	uid_t uid;
	108	gid_t gid;
	109	umode_t mode;
	110	long nr_blocks;
	111	long nr_inodes;
a137e1cc	112	struct hstate *hstate;
1da177e4 LT	113	};
	114
	115	struct hugetlbfs_sb_info {
	116	long max_blocks; /* blocks allowed */
	117	long free_blocks; /* blocks free */
	118	long max_inodes; /* inodes allowed */
	119	long free_inodes; /* inodes free */
	120	spinlock_t stat_lock;
a137e1cc	121	struct hstate *hstate;
1da177e4 LT	122	};
	123
	124
	125	struct hugetlbfs_inode_info {
	126	struct shared_policy policy;
	127	struct inode vfs_inode;
	128	};
	129
	130	static inline struct hugetlbfs_inode_info HUGETLBFS_I(struct inode inode)
	131	{
	132	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
	133	}
	134
	135	static inline struct hugetlbfs_sb_info HUGETLBFS_SB(struct super_block sb)
	136	{
	137	return sb->s_fs_info;
	138	}
	139
4b6f5d20	140	extern const struct file_operations hugetlbfs_file_operations;
1da177e4	141	extern struct vm_operations_struct hugetlb_vm_ops;
5a6fe125	142	struct file hugetlb_file_setup(const char name, size_t, int);
9a119c05 AL	143	int hugetlb_get_quota(struct address_space *mapping, long delta);
9a119c05 AL	144	void hugetlb_put_quota(struct address_space *mapping, long delta);
1da177e4 LT	145
	146	static inline int is_file_hugepages(struct file *file)
	147	{
516dffdc AL	148	if (file->f_op == &hugetlbfs_file_operations)
	149	return 1;
	150	if (is_file_shm_hugepages(file))
	151	return 1;
	152
	153	return 0;
1da177e4 LT	154	}
	155
	156	static inline void set_file_hugepages(struct file *file)
	157	{
	158	file->f_op = &hugetlbfs_file_operations;
	159	}
	160	#else /* !CONFIG_HUGETLBFS */
	161
1db8508c SR	162	#define is_file_hugepages(file) 0
	163	#define set_file_hugepages(file) BUG()
	164	#define hugetlb_file_setup(name,size,acctflag) ERR_PTR(-ENOSYS)
1da177e4 LT	165
	166	#endif /* !CONFIG_HUGETLBFS */
	167
d2ba27e8 AB	168	#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	169	unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
	170	unsigned long len, unsigned long pgoff,
	171	unsigned long flags);
	172	#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
	173
a5516438 AK	174	#ifdef CONFIG_HUGETLB_PAGE
a5516438 AK	175
a3437870	176	#define HSTATE_NAME_LEN 32
a5516438 AK	177	/* Defines one hugetlb page size */
	178	struct hstate {
	179	int hugetlb_next_nid;
	180	unsigned int order;
	181	unsigned long mask;
	182	unsigned long max_huge_pages;
	183	unsigned long nr_huge_pages;
	184	unsigned long free_huge_pages;
	185	unsigned long resv_huge_pages;
	186	unsigned long surplus_huge_pages;
	187	unsigned long nr_overcommit_huge_pages;
	188	struct list_head hugepage_freelists[MAX_NUMNODES];
	189	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	190	unsigned int free_huge_pages_node[MAX_NUMNODES];
	191	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
a3437870	192	char name[HSTATE_NAME_LEN];
a5516438 AK	193	};
a5516438 AK	194
53ba51d2 JT	195	struct huge_bootmem_page {
	196	struct list_head list;
	197	struct hstate *hstate;
	198	};
	199
	200	/* arch callback */
	201	int __init alloc_bootmem_huge_page(struct hstate *h);
	202
e5ff2159 AK	203	void __init hugetlb_add_hstate(unsigned order);
	204	struct hstate *size_to_hstate(unsigned long size);
	205
	206	#ifndef HUGE_MAX_HSTATE
	207	#define HUGE_MAX_HSTATE 1
	208	#endif
	209
	210	extern struct hstate hstates[HUGE_MAX_HSTATE];
	211	extern unsigned int default_hstate_idx;
	212
	213	#define default_hstate (hstates[default_hstate_idx])
a5516438	214
a137e1cc	215	static inline struct hstate hstate_inode(struct inode i)
a5516438	216	{
a137e1cc AK	217	struct hugetlbfs_sb_info *hsb;
	218	hsb = HUGETLBFS_SB(i->i_sb);
	219	return hsb->hstate;
a5516438 AK	220	}
	221
	222	static inline struct hstate hstate_file(struct file f)
	223	{
a137e1cc	224	return hstate_inode(f->f_dentry->d_inode);
a5516438 AK	225	}
a5516438 AK	226
a137e1cc	227	static inline struct hstate hstate_vma(struct vm_area_struct vma)
a5516438	228	{
a137e1cc	229	return hstate_file(vma->vm_file);
a5516438 AK	230	}
	231
	232	static inline unsigned long huge_page_size(struct hstate *h)
	233	{
	234	return (unsigned long)PAGE_SIZE << h->order;
	235	}
	236
08fba699 MG	237	extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
08fba699 MG	238
3340289d MG	239	extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
3340289d MG	240
a5516438 AK	241	static inline unsigned long huge_page_mask(struct hstate *h)
	242	{
	243	return h->mask;
	244	}
	245
	246	static inline unsigned int huge_page_order(struct hstate *h)
	247	{
	248	return h->order;
	249	}
	250
	251	static inline unsigned huge_page_shift(struct hstate *h)
	252	{
	253	return h->order + PAGE_SHIFT;
	254	}
	255
	256	static inline unsigned int pages_per_huge_page(struct hstate *h)
	257	{
	258	return 1 << h->order;
	259	}
	260
	261	static inline unsigned int blocks_per_huge_page(struct hstate *h)
	262	{
	263	return huge_page_size(h) / 512;
	264	}
	265
	266	#include <asm/hugetlb.h>
	267
e5ff2159 AK	268	static inline struct hstate page_hstate(struct page page)
	269	{
	270	return size_to_hstate(PAGE_SIZE << compound_order(page));
	271	}
	272
a5516438 AK	273	#else
a5516438 AK	274	struct hstate {};
53ba51d2	275	#define alloc_bootmem_huge_page(h) NULL
a5516438 AK	276	#define hstate_file(f) NULL
	277	#define hstate_vma(v) NULL
	278	#define hstate_inode(i) NULL
	279	#define huge_page_size(h) PAGE_SIZE
	280	#define huge_page_mask(h) PAGE_MASK
08fba699	281	#define vma_kernel_pagesize(v) PAGE_SIZE
3340289d	282	#define vma_mmu_pagesize(v) PAGE_SIZE
a5516438 AK	283	#define huge_page_order(h) 0
a5516438 AK	284	#define huge_page_shift(h) PAGE_SHIFT
510a35d4 AR	285	static inline unsigned int pages_per_huge_page(struct hstate *h)
	286	{
	287	return 1;
	288	}
a5516438 AK	289	#endif
a5516438 AK	290
1da177e4	291	#endif /* _LINUX_HUGETLB_H */