hugetlb.h 10.4 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);
Linus Torvalds's avatar
Linus Torvalds committed
58
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
59
void hugetlb_report_meminfo(struct seq_file *);
Linus Torvalds's avatar
Linus Torvalds committed
60
int hugetlb_report_node_meminfo(int, char *);
61
void hugetlb_show_meminfo(void);
Linus Torvalds's avatar
Linus Torvalds committed
62
unsigned long hugetlb_total_pages(void);
63
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
64
			unsigned long address, unsigned int flags);
65
int hugetlb_reserve_pages(struct inode *inode, long from, long to,
66
						struct vm_area_struct *vma,
67
						vm_flags_t vm_flags);
68
void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
69
int dequeue_hwpoisoned_huge_page(struct page *page);
70
void copy_huge_page(struct page *dst, struct page *src);
Linus Torvalds's avatar
Linus Torvalds committed
71

72
extern unsigned long hugepages_treat_as_movable;
Linus Torvalds's avatar
Linus Torvalds committed
73 74
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
75
extern struct list_head huge_boot_pages;
Linus Torvalds's avatar
Linus Torvalds committed
76

David Gibson's avatar
David Gibson committed
77 78
/* arch callbacks */

79 80
pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
David Gibson's avatar
David Gibson committed
81
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
82
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson's avatar
David Gibson committed
83 84 85 86
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
87 88
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int write);
David Gibson's avatar
David Gibson committed
89
int pmd_huge(pmd_t pmd);
Andi Kleen's avatar
Andi Kleen committed
90
int pud_huge(pud_t pmd);
91
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
92
		unsigned long address, unsigned long end, pgprot_t newprot);
David Gibson's avatar
David Gibson committed
93

Linus Torvalds's avatar
Linus Torvalds committed
94 95
#else /* !CONFIG_HUGETLB_PAGE */

96 97 98 99 100
static inline int PageHuge(struct page *page)
{
	return 0;
}

101 102 103 104
static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

Linus Torvalds's avatar
Linus Torvalds committed
105 106 107 108 109
static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

110
#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
Linus Torvalds's avatar
Linus Torvalds committed
111 112 113
#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; })
114 115 116
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
117
#define hugetlb_report_node_meminfo(n, buf)	0
118 119 120
static inline void hugetlb_show_meminfo(void)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
121
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
Andi Kleen's avatar
Andi Kleen committed
122
#define follow_huge_pud(mm, addr, pud, write)	NULL
123
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
Linus Torvalds's avatar
Linus Torvalds committed
124
#define pmd_huge(x)	0
Andi Kleen's avatar
Andi Kleen committed
125
#define pud_huge(x)	0
Linus Torvalds's avatar
Linus Torvalds committed
126
#define is_hugepage_only_range(mm, addr, len)	0
127
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
128
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
129
#define huge_pte_offset(mm, address)	0
130 131 132 133 134
static inline int dequeue_hwpoisoned_huge_page(struct page *page)
{
	return 0;
}

135 136 137
static inline void copy_huge_page(struct page *dst, struct page *src)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
138

139 140 141 142 143
static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot)
{
	return 0;
}
144

145 146 147 148 149 150 151
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();
}

152 153 154 155 156 157 158
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
159 160
#endif /* !CONFIG_HUGETLB_PAGE */

161 162
#define HUGETLB_ANON_FILE "anon_hugepage"

163 164 165 166 167 168
enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
169 170 171 172 173
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
174 175
};

Linus Torvalds's avatar
Linus Torvalds committed
176 177 178 179 180
#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
181
	struct hstate *hstate;
182
	struct hugepage_subpool *spool;
Linus Torvalds's avatar
Linus Torvalds committed
183 184 185 186 187 188 189
};

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

190
extern const struct file_operations hugetlbfs_file_operations;
191
extern const struct vm_operations_struct hugetlb_vm_ops;
192
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
193 194
				struct user_struct **user, int creat_flags,
				int page_size_log);
Linus Torvalds's avatar
Linus Torvalds committed
195 196 197

static inline int is_file_hugepages(struct file *file)
{
198 199 200 201 202 203
	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
204 205
}

206

Linus Torvalds's avatar
Linus Torvalds committed
207 208
#else /* !CONFIG_HUGETLBFS */

209
#define is_file_hugepages(file)			0
210
static inline struct file *
211 212
hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
		struct user_struct **user, int creat_flags,
213
		int page_size_log)
214 215 216
{
	return ERR_PTR(-ENOSYS);
}
Linus Torvalds's avatar
Linus Torvalds committed
217 218 219

#endif /* !CONFIG_HUGETLBFS */

220 221 222 223 224 225
#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 */

226 227
#ifdef CONFIG_HUGETLB_PAGE

228
#define HSTATE_NAME_LEN 32
229 230
/* Defines one hugetlb page size */
struct hstate {
231 232
	int next_nid_to_alloc;
	int next_nid_to_free;
233 234 235 236 237 238 239 240
	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;
241
	struct list_head hugepage_activelist;
242 243 244 245
	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];
246 247 248 249
#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files[5];
#endif
250
	char name[HSTATE_NAME_LEN];
251 252
};

253 254 255
struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
256 257 258
#ifdef CONFIG_HIGHMEM
	phys_addr_t phys;
#endif
259 260
};

261 262
struct page *alloc_huge_page_node(struct hstate *h, int nid);

263 264 265
/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

266 267 268 269 270 271 272 273 274 275 276
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])
277

278
static inline struct hstate *hstate_inode(struct inode *i)
279
{
280 281 282
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->hstate;
283 284 285 286
}

static inline struct hstate *hstate_file(struct file *f)
{
Al Viro's avatar
Al Viro committed
287
	return hstate_inode(file_inode(f));
288 289
}

290 291 292 293 294 295 296
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);
}

297
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
298
{
299
	return hstate_file(vma->vm_file);
300 301 302 303 304 305 306
}

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

307 308
extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

309 310
extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337
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>

338 339 340 341 342 343 344 345
#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

346 347 348 349 350
static inline struct hstate *page_hstate(struct page *page)
{
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

351 352 353 354 355
static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

356 357 358 359 360
static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

361
#else	/* CONFIG_HUGETLB_PAGE */
362
struct hstate {};
363
#define alloc_huge_page_node(h, nid) NULL
364
#define alloc_bootmem_huge_page(h) NULL
365
#define hstate_file(f) NULL
366
#define hstate_sizelog(s) NULL
367 368 369 370
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
371
#define vma_kernel_pagesize(v) PAGE_SIZE
372
#define vma_mmu_pagesize(v) PAGE_SIZE
373 374
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
375 376 377 378
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
379
#define hstate_index_to_shift(index) 0
380
#define hstate_index(h) 0
381
#endif	/* CONFIG_HUGETLB_PAGE */
382

Linus Torvalds's avatar
Linus Torvalds committed
383
#endif /* _LINUX_HUGETLB_H */