hugetlb.h 12.6 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);
83
void free_huge_page(struct page *page);
Linus Torvalds's avatar
Linus Torvalds committed
84

85 86 87 88
#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
#endif

89
extern unsigned long hugepages_treat_as_movable;
Linus Torvalds's avatar
Linus Torvalds committed
90
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
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;
}

346 347 348 349 350
static inline bool hstate_is_gigantic(struct hstate *h)
{
	return huge_page_order(h) >= MAX_ORDER;
}

351 352 353 354 355 356 357 358 359 360 361 362
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>

363 364 365 366 367 368 369 370
#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

371 372
static inline struct hstate *page_hstate(struct page *page)
{
373
	VM_BUG_ON_PAGE(!PageHuge(page), page);
374 375 376
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

377 378 379 380 381
static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

382 383 384 385 386
static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

387 388 389 390 391 392 393 394 395 396 397
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);
}

398 399
extern void dissolve_free_huge_pages(unsigned long start_pfn,
				     unsigned long end_pfn);
400
static inline int hugepage_migration_supported(struct hstate *h)
401
{
402 403 404 405 406
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	return huge_page_shift(h) == PMD_SHIFT;
#else
	return 0;
#endif
407
}
408

409 410 411 412 413 414 415 416 417
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;
}

418 419 420 421 422 423 424 425 426 427
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;
}

428
#else	/* CONFIG_HUGETLB_PAGE */
429
struct hstate {};
430
#define alloc_huge_page_node(h, nid) NULL
431
#define alloc_huge_page_noerr(v, a, r) NULL
432
#define alloc_bootmem_huge_page(h) NULL
433
#define hstate_file(f) NULL
434
#define hstate_sizelog(s) NULL
435 436
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
437
#define page_hstate(page) NULL
438 439
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
440
#define vma_kernel_pagesize(v) PAGE_SIZE
441
#define vma_mmu_pagesize(v) PAGE_SIZE
442 443
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
444 445 446 447
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
448
#define hstate_index_to_shift(index) 0
449
#define hstate_index(h) 0
450 451 452 453 454

static inline pgoff_t basepage_index(struct page *page)
{
	return page->index;
}
455
#define dissolve_free_huge_pages(s, e)	do {} while (0)
456
#define hugepage_migration_supported(h)	0
457 458 459 460 461 462

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	return &mm->page_table_lock;
}
463
#endif	/* CONFIG_HUGETLB_PAGE */
464

465 466 467 468 469 470 471 472 473 474
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
475
#endif /* _LINUX_HUGETLB_H */