hugetlb.h 9.62 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
#ifndef _LINUX_HUGETLB_H
#define _LINUX_HUGETLB_H

Linus Torvalds's avatar
Linus Torvalds committed
4
#include <linux/mm_types.h>
Alexey Dobriyan's avatar
Alexey Dobriyan committed
5
#include <linux/fs.h>
6
#include <linux/hugetlb_inline.h>
7
#include <linux/cgroup.h>
Alexey Dobriyan's avatar
Alexey Dobriyan committed
8

9
10
struct ctl_table;
struct user_struct;
11
struct mmu_gather;
12

Linus Torvalds's avatar
Linus Torvalds committed
13
14
15
#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mempolicy.h>
16
#include <linux/shm.h>
David Gibson's avatar
David Gibson committed
17
#include <asm/tlbflush.h>
Linus Torvalds's avatar
Linus Torvalds committed
18

19
20
21
22
23
24
struct hugepage_subpool {
	spinlock_t lock;
	long count;
	long max_hpages, used_hpages;
};

25
26
27
28
29
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)++)

30
31
32
struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
void hugepage_put_subpool(struct hugepage_subpool *spool);

33
34
int PageHuge(struct page *page);

35
void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
36
37
38
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 *);
39
40
41
42
43
44

#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
45
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
Hugh Dickins's avatar
Hugh Dickins committed
46
47
48
int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			struct page **, struct vm_area_struct **,
			unsigned long *, int *, int, unsigned int flags);
49
void unmap_hugepage_range(struct vm_area_struct *,
50
51
52
53
			  unsigned long, unsigned long, struct page *);
void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
				unsigned long start, unsigned long end,
				struct page *ref_page);
Linus Torvalds's avatar
Linus Torvalds committed
54
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
55
void hugetlb_report_meminfo(struct seq_file *);
Linus Torvalds's avatar
Linus Torvalds committed
56
57
int hugetlb_report_node_meminfo(int, char *);
unsigned long hugetlb_total_pages(void);
58
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
59
			unsigned long address, unsigned int flags);
60
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
61
						struct vm_area_struct *vma,
62
						vm_flags_t vm_flags);
63
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
64
int dequeue_hwpoisoned_huge_page(struct page *page);
65
void copy_huge_page(struct page *dst, struct page *src);
Linus Torvalds's avatar
Linus Torvalds committed
66

67
extern unsigned long hugepages_treat_as_movable;
Linus Torvalds's avatar
Linus Torvalds committed
68
69
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
70
extern struct list_head huge_boot_pages;
Linus Torvalds's avatar
Linus Torvalds committed
71

David Gibson's avatar
David Gibson committed
72
73
/* arch callbacks */

74
75
pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
David Gibson's avatar
David Gibson committed
76
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
77
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson's avatar
David Gibson committed
78
79
80
81
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
82
83
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int write);
David Gibson's avatar
David Gibson committed
84
int pmd_huge(pmd_t pmd);
Andi Kleen's avatar
Andi Kleen committed
85
int pud_huge(pud_t pmd);
86
87
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
88

Linus Torvalds's avatar
Linus Torvalds committed
89
90
#else /* !CONFIG_HUGETLB_PAGE */

91
92
93
94
95
static inline int PageHuge(struct page *page)
{
	return 0;
}

96
97
98
99
static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

Linus Torvalds's avatar
Linus Torvalds committed
100
101
102
103
104
static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

105
#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
Linus Torvalds's avatar
Linus Torvalds committed
106
107
108
#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; })
109
110
111
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
112
113
#define hugetlb_report_node_meminfo(n, buf)	0
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
Andi Kleen's avatar
Andi Kleen committed
114
#define follow_huge_pud(mm, addr, pud, write)	NULL
115
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
Linus Torvalds's avatar
Linus Torvalds committed
116
#define pmd_huge(x)	0
Andi Kleen's avatar
Andi Kleen committed
117
#define pud_huge(x)	0
Linus Torvalds's avatar
Linus Torvalds committed
118
#define is_hugepage_only_range(mm, addr, len)	0
119
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
120
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
121
#define huge_pte_offset(mm, address)	0
122
123
124
125
126
static inline int dequeue_hwpoisoned_huge_page(struct page *page)
{
	return 0;
}

127
128
129
static inline void copy_huge_page(struct page *dst, struct page *src)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
130

131
132
#define hugetlb_change_protection(vma, address, end, newprot)

133
134
135
136
137
138
139
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();
}

Linus Torvalds's avatar
Linus Torvalds committed
140
141
#endif /* !CONFIG_HUGETLB_PAGE */

142
143
#define HUGETLB_ANON_FILE "anon_hugepage"

144
145
146
147
148
149
enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
150
151
152
153
154
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
155
156
};

Linus Torvalds's avatar
Linus Torvalds committed
157
158
159
160
161
#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
162
	struct hstate *hstate;
163
	struct hugepage_subpool *spool;
Linus Torvalds's avatar
Linus Torvalds committed
164
165
166
167
168
169
170
};

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

171
extern const struct file_operations hugetlbfs_file_operations;
172
extern const struct vm_operations_struct hugetlb_vm_ops;
173
174
struct file *hugetlb_file_setup(const char *name, unsigned long addr,
				size_t size, vm_flags_t acct,
175
				struct user_struct **user, int creat_flags);
Linus Torvalds's avatar
Linus Torvalds committed
176
177
178

static inline int is_file_hugepages(struct file *file)
{
179
180
181
182
183
184
	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
185
186
187
188
}

#else /* !CONFIG_HUGETLBFS */

189
#define is_file_hugepages(file)			0
190
191
static inline struct file *
hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
192
		vm_flags_t acctflag, struct user_struct **user, int creat_flags)
193
194
195
{
	return ERR_PTR(-ENOSYS);
}
Linus Torvalds's avatar
Linus Torvalds committed
196
197
198

#endif /* !CONFIG_HUGETLBFS */

199
200
201
202
203
204
#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 */

205
206
#ifdef CONFIG_HUGETLB_PAGE

207
#define HSTATE_NAME_LEN 32
208
209
/* Defines one hugetlb page size */
struct hstate {
210
211
	int next_nid_to_alloc;
	int next_nid_to_free;
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;
220
	struct list_head hugepage_activelist;
221
222
223
224
	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];
225
226
227
228
#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files[5];
#endif
229
	char name[HSTATE_NAME_LEN];
230
231
};

232
233
234
struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
235
236
237
#ifdef CONFIG_HIGHMEM
	phys_addr_t phys;
#endif
238
239
};

240
241
struct page *alloc_huge_page_node(struct hstate *h, int nid);

242
243
244
/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

245
246
247
248
249
250
251
252
253
254
255
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])
256

257
static inline struct hstate *hstate_inode(struct inode *i)
258
{
259
260
261
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->hstate;
262
263
264
265
}

static inline struct hstate *hstate_file(struct file *f)
{
266
	return hstate_inode(f->f_dentry->d_inode);
267
268
}

269
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
270
{
271
	return hstate_file(vma->vm_file);
272
273
274
275
276
277
278
}

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

279
280
extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

281
282
extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
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>

310
311
312
313
314
315
316
317
#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

318
319
320
321
322
static inline struct hstate *page_hstate(struct page *page)
{
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

323
324
325
326
327
static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

328
329
330
331
332
static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

333
334
#else
struct hstate {};
335
#define alloc_huge_page_node(h, nid) NULL
336
#define alloc_bootmem_huge_page(h) NULL
337
338
339
340
341
#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
342
#define vma_kernel_pagesize(v) PAGE_SIZE
343
#define vma_mmu_pagesize(v) PAGE_SIZE
344
345
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
346
347
348
349
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
350
#define hstate_index_to_shift(index) 0
351
#define hstate_index(h) 0
352
353
#endif

Linus Torvalds's avatar
Linus Torvalds committed
354
#endif /* _LINUX_HUGETLB_H */