hugetlb.h 12.2 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 *);
46 47 48
long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			 struct page **, struct vm_area_struct **,
			 unsigned long *, unsigned long *, long, unsigned int);
49
void unmap_hugepage_range(struct vm_area_struct *,
50
			  unsigned long, unsigned long, struct page *);
51 52 53 54
void __unmap_hugepage_range_final(struct mmu_gather *tlb,
			  struct vm_area_struct *vma,
			  unsigned long start, unsigned long end,
			  struct page *ref_page);
55 56 57
void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
				unsigned long start, unsigned long end,
				struct page *ref_page);
58
void hugetlb_report_meminfo(struct seq_file *);
Linus Torvalds's avatar
Linus Torvalds committed
59
int hugetlb_report_node_meminfo(int, char *);
60
void hugetlb_show_meminfo(void);
Linus Torvalds's avatar
Linus Torvalds committed
61
unsigned long hugetlb_total_pages(void);
62
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
63
			unsigned long address, unsigned int flags);
64
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
65
						struct vm_area_struct *vma,
66
						vm_flags_t vm_flags);
67
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
68
int dequeue_hwpoisoned_huge_page(struct page *page);
69 70
bool isolate_huge_page(struct page *page, struct list_head *list);
void putback_active_hugepage(struct page *page);
71
bool is_hugepage_active(struct page *page);
Linus Torvalds's avatar
Linus Torvalds committed
72

73 74 75 76
#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
#endif

77
extern unsigned long hugepages_treat_as_movable;
Linus Torvalds's avatar
Linus Torvalds committed
78 79
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
80
extern struct list_head huge_boot_pages;
Linus Torvalds's avatar
Linus Torvalds committed
81

David Gibson's avatar
David Gibson committed
82 83
/* arch callbacks */

84 85
pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
David Gibson's avatar
David Gibson committed
86
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
87
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson's avatar
David Gibson committed
88 89 90 91
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
92 93
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int write);
David Gibson's avatar
David Gibson committed
94
int pmd_huge(pmd_t pmd);
Andi Kleen's avatar
Andi Kleen committed
95
int pud_huge(pud_t pmd);
96
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
97
		unsigned long address, unsigned long end, pgprot_t newprot);
David Gibson's avatar
David Gibson committed
98

Linus Torvalds's avatar
Linus Torvalds committed
99 100
#else /* !CONFIG_HUGETLB_PAGE */

101 102 103 104 105
static inline int PageHuge(struct page *page)
{
	return 0;
}

106 107 108 109
static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

Linus Torvalds's avatar
Linus Torvalds committed
110 111 112 113 114
static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

115
#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
Linus Torvalds's avatar
Linus Torvalds committed
116 117
#define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
118 119 120
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
121
#define hugetlb_report_node_meminfo(n, buf)	0
122 123 124
static inline void hugetlb_show_meminfo(void)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
125
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
Andi Kleen's avatar
Andi Kleen committed
126
#define follow_huge_pud(mm, addr, pud, write)	NULL
127
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
Linus Torvalds's avatar
Linus Torvalds committed
128
#define pmd_huge(x)	0
Andi Kleen's avatar
Andi Kleen committed
129
#define pud_huge(x)	0
Linus Torvalds's avatar
Linus Torvalds committed
130
#define is_hugepage_only_range(mm, addr, len)	0
131
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
132
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
133
#define huge_pte_offset(mm, address)	0
134 135 136 137 138
static inline int dequeue_hwpoisoned_huge_page(struct page *page)
{
	return 0;
}

139 140 141 142
static inline bool isolate_huge_page(struct page *page, struct list_head *list)
{
	return false;
}
143
#define putback_active_hugepage(p)	do {} while (0)
144
#define is_hugepage_active(x)	false
Linus Torvalds's avatar
Linus Torvalds committed
145

146 147 148 149 150
static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot)
{
	return 0;
}
151

152 153 154 155 156 157 158
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();
}

159 160 161 162 163 164 165
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
166 167
#endif /* !CONFIG_HUGETLB_PAGE */

168 169
#define HUGETLB_ANON_FILE "anon_hugepage"

170 171 172 173 174 175
enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
176 177 178 179 180
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
181 182
};

Linus Torvalds's avatar
Linus Torvalds committed
183 184 185 186 187
#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
188
	struct hstate *hstate;
189
	struct hugepage_subpool *spool;
Linus Torvalds's avatar
Linus Torvalds committed
190 191 192 193 194 195 196
};

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

197
extern const struct file_operations hugetlbfs_file_operations;
198
extern const struct vm_operations_struct hugetlb_vm_ops;
199
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
200 201
				struct user_struct **user, int creat_flags,
				int page_size_log);
Linus Torvalds's avatar
Linus Torvalds committed
202 203 204

static inline int is_file_hugepages(struct file *file)
{
205 206 207 208 209 210
	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
211 212
}

213

Linus Torvalds's avatar
Linus Torvalds committed
214 215
#else /* !CONFIG_HUGETLBFS */

216
#define is_file_hugepages(file)			0
217
static inline struct file *
218 219
hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
		struct user_struct **user, int creat_flags,
220
		int page_size_log)
221 222 223
{
	return ERR_PTR(-ENOSYS);
}
Linus Torvalds's avatar
Linus Torvalds committed
224 225 226

#endif /* !CONFIG_HUGETLBFS */

227 228 229 230 231 232
#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 */

233 234
#ifdef CONFIG_HUGETLB_PAGE

235
#define HSTATE_NAME_LEN 32
236 237
/* Defines one hugetlb page size */
struct hstate {
238 239
	int next_nid_to_alloc;
	int next_nid_to_free;
240 241 242 243 244 245 246 247
	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;
248
	struct list_head hugepage_activelist;
249 250 251 252
	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];
253 254 255 256
#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files[5];
#endif
257
	char name[HSTATE_NAME_LEN];
258 259
};

260 261 262
struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
263 264 265
#ifdef CONFIG_HIGHMEM
	phys_addr_t phys;
#endif
266 267
};

268
struct page *alloc_huge_page_node(struct hstate *h, int nid);
269 270
struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);
271

272 273 274
/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

275 276 277 278 279 280 281 282 283 284 285
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])
286

287
static inline struct hstate *hstate_inode(struct inode *i)
288
{
289 290 291
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->hstate;
292 293 294 295
}

static inline struct hstate *hstate_file(struct file *f)
{
Al Viro's avatar
Al Viro committed
296
	return hstate_inode(file_inode(f));
297 298
}

299 300 301 302 303 304 305
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);
}

306
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
307
{
308
	return hstate_file(vma->vm_file);
309 310 311 312 313 314 315
}

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

316 317
extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

318 319
extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346
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>

347 348 349 350 351 352 353 354
#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

355 356
static inline struct hstate *page_hstate(struct page *page)
{
357
	VM_BUG_ON(!PageHuge(page));
358 359 360
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

361 362 363 364 365
static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

366 367 368 369 370
static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

371 372 373 374 375 376 377 378 379 380 381
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);
}

382 383
extern void dissolve_free_huge_pages(unsigned long start_pfn,
				     unsigned long end_pfn);
384 385 386 387 388 389 390 391 392 393
int pmd_huge_support(void);
/*
 * Currently hugepage migration is enabled only for pmd-based hugepage.
 * This function will be updated when hugepage migration is more widely
 * supported.
 */
static inline int hugepage_migration_support(struct hstate *h)
{
	return pmd_huge_support() && (huge_page_shift(h) == PMD_SHIFT);
}
394

395 396 397 398 399 400 401 402 403
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;
}

404
#else	/* CONFIG_HUGETLB_PAGE */
405
struct hstate {};
406
#define alloc_huge_page_node(h, nid) NULL
407
#define alloc_huge_page_noerr(v, a, r) NULL
408
#define alloc_bootmem_huge_page(h) NULL
409
#define hstate_file(f) NULL
410
#define hstate_sizelog(s) NULL
411 412
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
413
#define page_hstate(page) NULL
414 415
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
416
#define vma_kernel_pagesize(v) PAGE_SIZE
417
#define vma_mmu_pagesize(v) PAGE_SIZE
418 419
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
420 421 422 423
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
424
#define hstate_index_to_shift(index) 0
425
#define hstate_index(h) 0
426 427 428 429 430

static inline pgoff_t basepage_index(struct page *page)
{
	return page->index;
}
431
#define dissolve_free_huge_pages(s, e)	do {} while (0)
432 433
#define pmd_huge_support()	0
#define hugepage_migration_support(h)	0
434 435 436 437 438 439

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	return &mm->page_table_lock;
}
440
#endif	/* CONFIG_HUGETLB_PAGE */
441

442 443 444 445 446 447 448 449 450 451
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
452
#endif /* _LINUX_HUGETLB_H */