hugetlb.h 14.9 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
struct hugepage_subpool {
	spinlock_t lock;
	long count;
25 26 27 28 29 30 31
	long max_hpages;	/* Maximum huge pages or -1 if no maximum. */
	long used_hpages;	/* Used count against maximum, includes */
				/* both alloced and reserved pages. */
	struct hstate *hstate;
	long min_hpages;	/* Minimum huge pages or -1 if no minimum. */
	long rsv_hpages;	/* Pages reserved against global pool to */
				/* sasitfy minimum size. */
32 33
};

34 35
struct resv_map {
	struct kref refs;
36
	spinlock_t lock;
37
	struct list_head regions;
38 39 40
	long adds_in_progress;
	struct list_head region_cache;
	long region_cache_count;
41 42 43 44
};
extern struct resv_map *resv_map_alloc(void);
void resv_map_release(struct kref *ref);

45 46 47 48 49
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)++)

50 51
struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
						long min_hpages);
52 53
void hugepage_put_subpool(struct hugepage_subpool *spool);

54
void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
55 56 57
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 *);
58 59 60 61 62 63

#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
64
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
65 66 67
long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			 struct page **, struct vm_area_struct **,
			 unsigned long *, unsigned long *, long, unsigned int);
68
void unmap_hugepage_range(struct vm_area_struct *,
69
			  unsigned long, unsigned long, struct page *);
70 71 72 73
void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			  struct vm_area_struct *vma,
			  unsigned long start, unsigned long end,
			  struct page *ref_page);
74 75 76
void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
				unsigned long start, unsigned long end,
				struct page *ref_page);
77
void hugetlb_report_meminfo(struct seq_file *);
Linus Torvalds's avatar
Linus Torvalds committed
78
int hugetlb_report_node_meminfo(int, char *);
79
void hugetlb_show_meminfo(void);
Linus Torvalds's avatar
Linus Torvalds committed
80
unsigned long hugetlb_total_pages(void);
81
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
82
			unsigned long address, unsigned int flags);
83
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
84
						struct vm_area_struct *vma,
85
						vm_flags_t vm_flags);
86 87
long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
						long freed);
88
int dequeue_hwpoisoned_huge_page(struct page *page);
89 90
bool isolate_huge_page(struct page *page, struct list_head *list);
void putback_active_hugepage(struct page *page);
91
void free_huge_page(struct page *page);
92
void hugetlb_fix_reserve_counts(struct inode *inode, bool restore_reserve);
93 94 95 96 97
extern struct mutex *hugetlb_fault_mutex_table;
u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
				struct vm_area_struct *vma,
				struct address_space *mapping,
				pgoff_t idx, unsigned long address);
Linus Torvalds's avatar
Linus Torvalds committed
98

99 100
pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);

101
extern int hugepages_treat_as_movable;
Linus Torvalds's avatar
Linus Torvalds committed
102
extern int sysctl_hugetlb_shm_group;
103
extern struct list_head huge_boot_pages;
Linus Torvalds's avatar
Linus Torvalds committed
104

David Gibson's avatar
David Gibson committed
105 106
/* arch callbacks */

107 108
pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
David Gibson's avatar
David Gibson committed
109
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
110
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson's avatar
David Gibson committed
111 112 113
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,
114
				pmd_t *pmd, int flags);
Andi Kleen's avatar
Andi Kleen committed
115
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
116
				pud_t *pud, int flags);
David Gibson's avatar
David Gibson committed
117
int pmd_huge(pmd_t pmd);
Andi Kleen's avatar
Andi Kleen committed
118
int pud_huge(pud_t pmd);
119
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
120
		unsigned long address, unsigned long end, pgprot_t newprot);
David Gibson's avatar
David Gibson committed
121

Linus Torvalds's avatar
Linus Torvalds committed
122 123
#else /* !CONFIG_HUGETLB_PAGE */

124 125 126 127
static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

Linus Torvalds's avatar
Linus Torvalds committed
128 129 130 131 132
static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

133
#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
Linus Torvalds's avatar
Linus Torvalds committed
134 135
#define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
136 137 138
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
139
#define hugetlb_report_node_meminfo(n, buf)	0
140 141 142
static inline void hugetlb_show_meminfo(void)
{
}
143 144
#define follow_huge_pmd(mm, addr, pmd, flags)	NULL
#define follow_huge_pud(mm, addr, pud, flags)	NULL
145
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
Linus Torvalds's avatar
Linus Torvalds committed
146
#define pmd_huge(x)	0
Andi Kleen's avatar
Andi Kleen committed
147
#define pud_huge(x)	0
Linus Torvalds's avatar
Linus Torvalds committed
148
#define is_hugepage_only_range(mm, addr, len)	0
149
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
150
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
151
#define huge_pte_offset(mm, address)	0
152 153 154 155 156
static inline int dequeue_hwpoisoned_huge_page(struct page *page)
{
	return 0;
}

157 158 159 160
static inline bool isolate_huge_page(struct page *page, struct list_head *list)
{
	return false;
}
161
#define putback_active_hugepage(p)	do {} while (0)
Linus Torvalds's avatar
Linus Torvalds committed
162

163 164 165 166 167
static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot)
{
	return 0;
}
168

169 170 171 172 173 174 175
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();
}

176 177 178 179 180 181 182
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
183
#endif /* !CONFIG_HUGETLB_PAGE */
184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229
/*
 * hugepages at page global directory. If arch support
 * hugepages at pgd level, they need to define this.
 */
#ifndef pgd_huge
#define pgd_huge(x)	0
#endif

#ifndef pgd_write
static inline int pgd_write(pgd_t pgd)
{
	BUG();
	return 0;
}
#endif

#ifndef pud_write
static inline int pud_write(pud_t pud)
{
	BUG();
	return 0;
}
#endif

#ifndef is_hugepd
/*
 * Some architectures requires a hugepage directory format that is
 * required to support multiple hugepage sizes. For example
 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
 * introduced the same on powerpc. This allows for a more flexible hugepage
 * pagetable layout.
 */
typedef struct { unsigned long pd; } hugepd_t;
#define is_hugepd(hugepd) (0)
#define __hugepd(x) ((hugepd_t) { (x) })
static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
			      unsigned pdshift, unsigned long end,
			      int write, struct page **pages, int *nr)
{
	return 0;
}
#else
extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
		       unsigned pdshift, unsigned long end,
		       int write, struct page **pages, int *nr);
#endif
Linus Torvalds's avatar
Linus Torvalds committed
230

231 232
#define HUGETLB_ANON_FILE "anon_hugepage"

233 234 235 236 237 238
enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
239 240 241 242 243
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
244 245
};

Linus Torvalds's avatar
Linus Torvalds committed
246 247 248 249 250
#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
251
	struct hstate *hstate;
252
	struct hugepage_subpool *spool;
Linus Torvalds's avatar
Linus Torvalds committed
253 254 255 256 257 258 259
};

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

260
extern const struct file_operations hugetlbfs_file_operations;
261
extern const struct vm_operations_struct hugetlb_vm_ops;
262
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
263 264
				struct user_struct **user, int creat_flags,
				int page_size_log);
Linus Torvalds's avatar
Linus Torvalds committed
265 266 267

static inline int is_file_hugepages(struct file *file)
{
268 269 270 271 272 273
	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
274 275
}

276

Linus Torvalds's avatar
Linus Torvalds committed
277 278
#else /* !CONFIG_HUGETLBFS */

279
#define is_file_hugepages(file)			0
280
static inline struct file *
281 282
hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
		struct user_struct **user, int creat_flags,
283
		int page_size_log)
284 285 286
{
	return ERR_PTR(-ENOSYS);
}
Linus Torvalds's avatar
Linus Torvalds committed
287 288 289

#endif /* !CONFIG_HUGETLBFS */

290 291 292 293 294 295
#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 */

296 297
#ifdef CONFIG_HUGETLB_PAGE

298
#define HSTATE_NAME_LEN 32
299 300
/* Defines one hugetlb page size */
struct hstate {
301 302
	int next_nid_to_alloc;
	int next_nid_to_free;
303 304 305 306 307 308 309 310
	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;
311
	struct list_head hugepage_activelist;
312 313 314 315
	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];
316 317 318 319
#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files[5];
#endif
320
	char name[HSTATE_NAME_LEN];
321 322
};

323 324 325
struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
326 327 328
#ifdef CONFIG_HIGHMEM
	phys_addr_t phys;
#endif
329 330
};

331 332
struct page *alloc_huge_page(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);
333
struct page *alloc_huge_page_node(struct hstate *h, int nid);
334 335
struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);
336 337
int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
			pgoff_t idx);
338

339 340 341
/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

342 343 344 345 346 347 348 349 350 351 352
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])
353

354
static inline struct hstate *hstate_inode(struct inode *i)
355
{
356 357 358
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->hstate;
359 360 361 362
}

static inline struct hstate *hstate_file(struct file *f)
{
Al Viro's avatar
Al Viro committed
363
	return hstate_inode(file_inode(f));
364 365
}

366 367 368 369
static inline struct hstate *hstate_sizelog(int page_size_log)
{
	if (!page_size_log)
		return &default_hstate;
370 371

	return size_to_hstate(1UL << page_size_log);
372 373
}

374
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
375
{
376
	return hstate_file(vma->vm_file);
377 378 379 380 381 382 383
}

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

384 385
extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

386 387
extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

388 389 390 391 392 393 394 395 396 397 398 399 400 401 402
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;
}

403 404 405 406 407
static inline bool hstate_is_gigantic(struct hstate *h)
{
	return huge_page_order(h) >= MAX_ORDER;
}

408 409 410 411 412 413 414 415 416 417 418 419
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>

420 421 422 423 424 425 426 427
#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

428 429
static inline struct hstate *page_hstate(struct page *page)
{
430
	VM_BUG_ON_PAGE(!PageHuge(page), page);
431 432 433
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

434 435 436 437 438
static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

439 440 441 442 443
static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

444 445 446 447 448 449 450 451 452 453 454
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);
}

455 456
extern void dissolve_free_huge_pages(unsigned long start_pfn,
				     unsigned long end_pfn);
457
static inline int hugepage_migration_supported(struct hstate *h)
458
{
459 460 461 462 463
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
	return huge_page_shift(h) == PMD_SHIFT;
#else
	return 0;
#endif
464
}
465

466 467 468 469 470 471 472 473 474
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;
}

475 476 477 478 479 480 481 482
#ifndef hugepages_supported
/*
 * Some platform decide whether they support huge pages at boot
 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
 * when there is no such support
 */
#define hugepages_supported() (HPAGE_SHIFT != 0)
#endif
483

484 485 486 487 488 489 490 491 492 493 494
void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);

static inline void hugetlb_count_add(long l, struct mm_struct *mm)
{
	atomic_long_add(l, &mm->hugetlb_usage);
}

static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
{
	atomic_long_sub(l, &mm->hugetlb_usage);
}
495
#else	/* CONFIG_HUGETLB_PAGE */
496
struct hstate {};
497
#define alloc_huge_page(v, a, r) NULL
498
#define alloc_huge_page_node(h, nid) NULL
499
#define alloc_huge_page_noerr(v, a, r) NULL
500
#define alloc_bootmem_huge_page(h) NULL
501
#define hstate_file(f) NULL
502
#define hstate_sizelog(s) NULL
503 504
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
505
#define page_hstate(page) NULL
506 507
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
508
#define vma_kernel_pagesize(v) PAGE_SIZE
509
#define vma_mmu_pagesize(v) PAGE_SIZE
510 511
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
512 513 514 515
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
516
#define hstate_index_to_shift(index) 0
517
#define hstate_index(h) 0
518 519 520 521 522

static inline pgoff_t basepage_index(struct page *page)
{
	return page->index;
}
523
#define dissolve_free_huge_pages(s, e)	do {} while (0)
524
#define hugepage_migration_supported(h)	0
525 526 527 528 529 530

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	return &mm->page_table_lock;
}
531 532 533 534 535 536 537 538

static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
{
}

static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
{
}
539
#endif	/* CONFIG_HUGETLB_PAGE */
540

541 542 543 544 545 546 547 548 549 550
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
551
#endif /* _LINUX_HUGETLB_H */