hugetlb.h 12.5 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>
5
#include <linux/mmdebug.h>
Alexey Dobriyan's avatar
Alexey Dobriyan committed
6
#include <linux/fs.h>
7
#include <linux/hugetlb_inline.h>
8
#include <linux/cgroup.h>
9
10
#include <linux/list.h>
#include <linux/kref.h>
Alexey Dobriyan's avatar
Alexey Dobriyan committed
11

12
13
struct ctl_table;
struct user_struct;
14
struct mmu_gather;
15

Linus Torvalds's avatar
Linus Torvalds committed
16
17
18
#ifdef CONFIG_HUGETLB_PAGE

#include <linux/mempolicy.h>
19
#include <linux/shm.h>
David Gibson's avatar
David Gibson committed
20
#include <asm/tlbflush.h>
Linus Torvalds's avatar
Linus Torvalds committed
21

22
23
24
25
26
27
struct hugepage_subpool {
	spinlock_t lock;
	long count;
	long max_hpages, used_hpages;
};

28
29
struct resv_map {
	struct kref refs;
30
	spinlock_t lock;
31
32
33
34
35
	struct list_head regions;
};
extern struct resv_map *resv_map_alloc(void);
void resv_map_release(struct kref *ref);

36
37
38
39
40
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)++)

41
42
43
struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
void hugepage_put_subpool(struct hugepage_subpool *spool);

44
45
int PageHuge(struct page *page);

46
void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
47
48
49
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 *);
50
51
52
53
54
55

#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
56
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
57
58
59
long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			 struct page **, struct vm_area_struct **,
			 unsigned long *, unsigned long *, long, unsigned int);
60
void unmap_hugepage_range(struct vm_area_struct *,
61
			  unsigned long, unsigned long, struct page *);
62
63
64
65
void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			  struct vm_area_struct *vma,
			  unsigned long start, unsigned long end,
			  struct page *ref_page);
66
67
68
void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
				unsigned long start, unsigned long end,
				struct page *ref_page);
69
void hugetlb_report_meminfo(struct seq_file *);
Linus Torvalds's avatar
Linus Torvalds committed
70
int hugetlb_report_node_meminfo(int, char *);
71
void hugetlb_show_meminfo(void);
Linus Torvalds's avatar
Linus Torvalds committed
72
unsigned long hugetlb_total_pages(void);
73
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
74
			unsigned long address, unsigned int flags);
75
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
76
						struct vm_area_struct *vma,
77
						vm_flags_t vm_flags);
78
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
79
int dequeue_hwpoisoned_huge_page(struct page *page);
80
81
bool isolate_huge_page(struct page *page, struct list_head *list);
void putback_active_hugepage(struct page *page);
82
bool is_hugepage_active(struct page *page);
Linus Torvalds's avatar
Linus Torvalds committed
83

84
85
86
87
#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
#endif

88
extern unsigned long hugepages_treat_as_movable;
Linus Torvalds's avatar
Linus Torvalds committed
89
90
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
91
extern struct list_head huge_boot_pages;
Linus Torvalds's avatar
Linus Torvalds committed
92

David Gibson's avatar
David Gibson committed
93
94
/* arch callbacks */

95
96
pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
David Gibson's avatar
David Gibson committed
97
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
98
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson's avatar
David Gibson committed
99
100
101
102
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
103
104
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int write);
David Gibson's avatar
David Gibson committed
105
int pmd_huge(pmd_t pmd);
Andi Kleen's avatar
Andi Kleen committed
106
int pud_huge(pud_t pmd);
107
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
108
		unsigned long address, unsigned long end, pgprot_t newprot);
David Gibson's avatar
David Gibson committed
109

Linus Torvalds's avatar
Linus Torvalds committed
110
111
#else /* !CONFIG_HUGETLB_PAGE */

112
113
114
115
116
static inline int PageHuge(struct page *page)
{
	return 0;
}

117
118
119
120
static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

Linus Torvalds's avatar
Linus Torvalds committed
121
122
123
124
125
static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

126
#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
Linus Torvalds's avatar
Linus Torvalds committed
127
128
#define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
129
130
131
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
132
#define hugetlb_report_node_meminfo(n, buf)	0
133
134
135
static inline void hugetlb_show_meminfo(void)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
136
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
Andi Kleen's avatar
Andi Kleen committed
137
#define follow_huge_pud(mm, addr, pud, write)	NULL
138
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
Linus Torvalds's avatar
Linus Torvalds committed
139
#define pmd_huge(x)	0
Andi Kleen's avatar
Andi Kleen committed
140
#define pud_huge(x)	0
Linus Torvalds's avatar
Linus Torvalds committed
141
#define is_hugepage_only_range(mm, addr, len)	0
142
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
143
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
144
#define huge_pte_offset(mm, address)	0
145
146
147
148
149
static inline int dequeue_hwpoisoned_huge_page(struct page *page)
{
	return 0;
}

150
151
152
153
static inline bool isolate_huge_page(struct page *page, struct list_head *list)
{
	return false;
}
154
#define putback_active_hugepage(p)	do {} while (0)
155
#define is_hugepage_active(x)	false
Linus Torvalds's avatar
Linus Torvalds committed
156

157
158
159
160
161
static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot)
{
	return 0;
}
162

163
164
165
166
167
168
169
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();
}

170
171
172
173
174
175
176
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
177
178
#endif /* !CONFIG_HUGETLB_PAGE */

179
180
#define HUGETLB_ANON_FILE "anon_hugepage"

181
182
183
184
185
186
enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
187
188
189
190
191
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
192
193
};

Linus Torvalds's avatar
Linus Torvalds committed
194
195
196
197
198
#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
199
	struct hstate *hstate;
200
	struct hugepage_subpool *spool;
Linus Torvalds's avatar
Linus Torvalds committed
201
202
203
204
205
206
207
};

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

208
extern const struct file_operations hugetlbfs_file_operations;
209
extern const struct vm_operations_struct hugetlb_vm_ops;
210
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
211
212
				struct user_struct **user, int creat_flags,
				int page_size_log);
Linus Torvalds's avatar
Linus Torvalds committed
213
214
215

static inline int is_file_hugepages(struct file *file)
{
216
217
218
219
220
221
	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
222
223
}

224

Linus Torvalds's avatar
Linus Torvalds committed
225
226
#else /* !CONFIG_HUGETLBFS */

227
#define is_file_hugepages(file)			0
228
static inline struct file *
229
230
hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
		struct user_struct **user, int creat_flags,
231
		int page_size_log)
232
233
234
{
	return ERR_PTR(-ENOSYS);
}
Linus Torvalds's avatar
Linus Torvalds committed
235
236
237

#endif /* !CONFIG_HUGETLBFS */

238
239
240
241
242
243
#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 */

244
245
#ifdef CONFIG_HUGETLB_PAGE

246
#define HSTATE_NAME_LEN 32
247
248
/* Defines one hugetlb page size */
struct hstate {
249
250
	int next_nid_to_alloc;
	int next_nid_to_free;
251
252
253
254
255
256
257
258
	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;
259
	struct list_head hugepage_activelist;
260
261
262
263
	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];
264
265
266
267
#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files[5];
#endif
268
	char name[HSTATE_NAME_LEN];
269
270
};

271
272
273
struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
274
275
276
#ifdef CONFIG_HIGHMEM
	phys_addr_t phys;
#endif
277
278
};

279
struct page *alloc_huge_page_node(struct hstate *h, int nid);
280
281
struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);
282

283
284
285
/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

286
287
288
289
290
291
292
293
294
295
296
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])
297

298
static inline struct hstate *hstate_inode(struct inode *i)
299
{
300
301
302
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->hstate;
303
304
305
306
}

static inline struct hstate *hstate_file(struct file *f)
{
Al Viro's avatar
Al Viro committed
307
	return hstate_inode(file_inode(f));
308
309
}

310
311
312
313
314
315
316
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);
}

317
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
318
{
319
	return hstate_file(vma->vm_file);
320
321
322
323
324
325
326
}

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

327
328
extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

329
330
extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
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>

358
359
360
361
362
363
364
365
#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

366
367
static inline struct hstate *page_hstate(struct page *page)
{
368
	VM_BUG_ON_PAGE(!PageHuge(page), page);
369
370
371
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

372
373
374
375
376
static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

377
378
379
380
381
static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

382
383
384
385
386
387
388
389
390
391
392
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);
}

393
394
extern void dissolve_free_huge_pages(unsigned long start_pfn,
				     unsigned long end_pfn);
395
396
static inline int hugepage_migration_support(struct hstate *h)
{
397
398
399
400
401
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	return huge_page_shift(h) == PMD_SHIFT;
#else
	return 0;
#endif
402
}
403

404
405
406
407
408
409
410
411
412
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;
}

413
414
415
416
417
418
419
420
421
422
static inline bool hugepages_supported(void)
{
	/*
	 * Some platform decide whether they support huge pages at boot
	 * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
	 * there is no such support
	 */
	return HPAGE_SHIFT != 0;
}

423
#else	/* CONFIG_HUGETLB_PAGE */
424
struct hstate {};
425
#define alloc_huge_page_node(h, nid) NULL
426
#define alloc_huge_page_noerr(v, a, r) NULL
427
#define alloc_bootmem_huge_page(h) NULL
428
#define hstate_file(f) NULL
429
#define hstate_sizelog(s) NULL
430
431
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
432
#define page_hstate(page) NULL
433
434
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
435
#define vma_kernel_pagesize(v) PAGE_SIZE
436
#define vma_mmu_pagesize(v) PAGE_SIZE
437
438
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
439
440
441
442
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
443
#define hstate_index_to_shift(index) 0
444
#define hstate_index(h) 0
445
446
447
448
449

static inline pgoff_t basepage_index(struct page *page)
{
	return page->index;
}
450
#define dissolve_free_huge_pages(s, e)	do {} while (0)
451
#define hugepage_migration_support(h)	0
452
453
454
455
456
457

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	return &mm->page_table_lock;
}
458
#endif	/* CONFIG_HUGETLB_PAGE */
459

460
461
462
463
464
465
466
467
468
469
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;
}

Linus Torvalds's avatar
Linus Torvalds committed
470
#endif /* _LINUX_HUGETLB_H */