hugetlb.h 8.73 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3
#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

Alexey Dobriyan's avatar
Alexey Dobriyan committed
4
#include <linux/fs.h>
5
#include <linux/hugetlb_inline.h>
Alexey Dobriyan's avatar
Alexey Dobriyan committed
6

7 8 9
struct ctl_table;
struct user_struct;

Linus Torvalds's avatar
Linus Torvalds committed
10 11 12
#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mempolicy.h>
13
#include <linux/shm.h>
David Gibson's avatar
David Gibson committed
14
#include <asm/tlbflush.h>
Linus Torvalds's avatar
Linus Torvalds committed
15

16 17
int PageHuge(struct page *page);

18
void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
19 20 21
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 *);
22 23 24 25 26 27

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

Linus Torvalds's avatar
Linus Torvalds committed
28
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
Hugh Dickins's avatar
Hugh Dickins committed
29 30 31
int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			struct page **, struct vm_area_struct **,
			unsigned long *, int *, int, unsigned int flags);
32 33 34 35
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 *);
Linus Torvalds's avatar
Linus Torvalds committed
36
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
37
void hugetlb_report_meminfo(struct seq_file *);
Linus Torvalds's avatar
Linus Torvalds committed
38 39
int hugetlb_report_node_meminfo(int, char *);
unsigned long hugetlb_total_pages(void);
40
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
41
			unsigned long address, unsigned int flags);
42
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
43 44
						struct vm_area_struct *vma,
						int acctflags);
45
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
Linus Torvalds's avatar
Linus Torvalds committed
46

47
extern unsigned long hugepages_treat_as_movable;
Linus Torvalds's avatar
Linus Torvalds committed
48 49
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
50
extern struct list_head huge_boot_pages;
Linus Torvalds's avatar
Linus Torvalds committed
51

David Gibson's avatar
David Gibson committed
52 53
/* arch callbacks */

54 55
pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
David Gibson's avatar
David Gibson committed
56
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
57
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson's avatar
David Gibson committed
58 59 60 61
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);
Andi Kleen's avatar
Andi Kleen committed
62 63
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int write);
David Gibson's avatar
David Gibson committed
64
int pmd_huge(pmd_t pmd);
Andi Kleen's avatar
Andi Kleen committed
65
int pud_huge(pud_t pmd);
66 67
void hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot);
David Gibson's avatar
David Gibson committed
68

Linus Torvalds's avatar
Linus Torvalds committed
69 70
#else /* !CONFIG_HUGETLB_PAGE */

71 72 73 74 75
static inline int PageHuge(struct page *page)
{
	return 0;
}

76 77 78 79
static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

Linus Torvalds's avatar
Linus Torvalds committed
80 81 82 83 84
static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

85
#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
Linus Torvalds's avatar
Linus Torvalds committed
86 87 88
#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; })
89
#define unmap_hugepage_range(vma, start, end, page)	BUG()
90 91 92
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
93 94
#define hugetlb_report_node_meminfo(n, buf)	0
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
Andi Kleen's avatar
Andi Kleen committed
95
#define follow_huge_pud(mm, addr, pud, write)	NULL
96
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
Linus Torvalds's avatar
Linus Torvalds committed
97
#define pmd_huge(x)	0
Andi Kleen's avatar
Andi Kleen committed
98
#define pud_huge(x)	0
Linus Torvalds's avatar
Linus Torvalds committed
99
#define is_hugepage_only_range(mm, addr, len)	0
100
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
101
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
Linus Torvalds's avatar
Linus Torvalds committed
102

103 104
#define hugetlb_change_protection(vma, address, end, newprot)

Linus Torvalds's avatar
Linus Torvalds committed
105
#ifndef HPAGE_MASK
106 107
#define HPAGE_MASK	PAGE_MASK		/* Keep the compiler happy */
#define HPAGE_SIZE	PAGE_SIZE
Linus Torvalds's avatar
Linus Torvalds committed
108 109 110 111
#endif

#endif /* !CONFIG_HUGETLB_PAGE */

112 113
#define HUGETLB_ANON_FILE "anon_hugepage"

114 115 116 117 118 119
enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
120 121 122 123 124
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
125 126
};

Linus Torvalds's avatar
Linus Torvalds committed
127 128 129 130 131 132 133
#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_config {
	uid_t   uid;
	gid_t   gid;
	umode_t mode;
	long	nr_blocks;
	long	nr_inodes;
134
	struct hstate *hstate;
Linus Torvalds's avatar
Linus Torvalds committed
135 136 137 138 139 140 141 142
};

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;
143
	struct hstate *hstate;
Linus Torvalds's avatar
Linus Torvalds committed
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
};


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;
}

162
extern const struct file_operations hugetlbfs_file_operations;
163
extern const struct vm_operations_struct hugetlb_vm_ops;
164
struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
165
				struct user_struct **user, int creat_flags);
166 167
int hugetlb_get_quota(struct address_space *mapping, long delta);
void hugetlb_put_quota(struct address_space *mapping, long delta);
Linus Torvalds's avatar
Linus Torvalds committed
168 169 170

static inline int is_file_hugepages(struct file *file)
{
171 172 173 174 175 176
	if (file->f_op == &hugetlbfs_file_operations)
		return 1;
	if (is_file_shm_hugepages(file))
		return 1;

	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
177 178 179 180 181 182 183 184
}

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

185 186
#define is_file_hugepages(file)			0
#define set_file_hugepages(file)		BUG()
187 188 189 190 191
static inline struct file *hugetlb_file_setup(const char *name, size_t size,
		int acctflag, struct user_struct **user, int creat_flags)
{
	return ERR_PTR(-ENOSYS);
}
Linus Torvalds's avatar
Linus Torvalds committed
192 193 194

#endif /* !CONFIG_HUGETLBFS */

195 196 197 198 199 200
#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 */

201 202
#ifdef CONFIG_HUGETLB_PAGE

203
#define HSTATE_NAME_LEN 32
204 205
/* Defines one hugetlb page size */
struct hstate {
206 207
	int next_nid_to_alloc;
	int next_nid_to_free;
208 209 210 211 212 213 214 215 216 217 218 219
	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];
220
	char name[HSTATE_NAME_LEN];
221 222
};

223 224 225 226 227 228 229 230
struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
};

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

231 232 233 234 235 236 237 238 239 240 241
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])
242

243
static inline struct hstate *hstate_inode(struct inode *i)
244
{
245 246 247
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->hstate;
248 249 250 251
}

static inline struct hstate *hstate_file(struct file *f)
{
252
	return hstate_inode(f->f_dentry->d_inode);
253 254
}

255
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
256
{
257
	return hstate_file(vma->vm_file);
258 259 260 261 262 263 264
}

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

265 266
extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

267 268
extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
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>

296 297 298 299 300
static inline struct hstate *page_hstate(struct page *page)
{
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

301 302
#else
struct hstate {};
303
#define alloc_bootmem_huge_page(h) NULL
304 305 306 307 308
#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
309
#define vma_kernel_pagesize(v) PAGE_SIZE
310
#define vma_mmu_pagesize(v) PAGE_SIZE
311 312
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
313 314 315 316
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
317 318
#endif

Linus Torvalds's avatar
Linus Torvalds committed
319
#endif /* _LINUX_HUGETLB_H */