hugetlb.h 9.96 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 *);
Hugh Dickins's avatar
Hugh Dickins committed
46 47 48
int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
			struct page **, struct vm_area_struct **,
			unsigned long *, int *, int, unsigned int flags);
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 61
int hugetlb_report_node_meminfo(int, char *);
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
void copy_huge_page(struct page *dst, struct page *src);
Linus Torvalds's avatar
Linus Torvalds committed
70

71
extern unsigned long hugepages_treat_as_movable;
Linus Torvalds's avatar
Linus Torvalds committed
72 73
extern const unsigned long hugetlb_zero, hugetlb_infinity;
extern int sysctl_hugetlb_shm_group;
74
extern struct list_head huge_boot_pages;
Linus Torvalds's avatar
Linus Torvalds committed
75

David Gibson's avatar
David Gibson committed
76 77
/* arch callbacks */

78 79
pte_t *huge_pte_alloc(struct mm_struct *mm,
			unsigned long addr, unsigned long sz);
David Gibson's avatar
David Gibson committed
80
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
81
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
David Gibson's avatar
David Gibson committed
82 83 84 85
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
86 87
struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
				pud_t *pud, int write);
David Gibson's avatar
David Gibson committed
88
int pmd_huge(pmd_t pmd);
Andi Kleen's avatar
Andi Kleen committed
89
int pud_huge(pud_t pmd);
90 91
void hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot);
David Gibson's avatar
David Gibson committed
92

Linus Torvalds's avatar
Linus Torvalds committed
93 94
#else /* !CONFIG_HUGETLB_PAGE */

95 96 97 98 99
static inline int PageHuge(struct page *page)
{
	return 0;
}

100 101 102 103
static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

Linus Torvalds's avatar
Linus Torvalds committed
104 105 106 107 108
static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

109
#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
Linus Torvalds's avatar
Linus Torvalds committed
110 111 112
#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; })
113 114 115
static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
116 117
#define hugetlb_report_node_meminfo(n, buf)	0
#define follow_huge_pmd(mm, addr, pmd, write)	NULL
Andi Kleen's avatar
Andi Kleen committed
118
#define follow_huge_pud(mm, addr, pud, write)	NULL
119
#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
Linus Torvalds's avatar
Linus Torvalds committed
120
#define pmd_huge(x)	0
Andi Kleen's avatar
Andi Kleen committed
121
#define pud_huge(x)	0
Linus Torvalds's avatar
Linus Torvalds committed
122
#define is_hugepage_only_range(mm, addr, len)	0
123
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
124
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
125
#define huge_pte_offset(mm, address)	0
126 127 128 129 130
static inline int dequeue_hwpoisoned_huge_page(struct page *page)
{
	return 0;
}

131 132 133
static inline void copy_huge_page(struct page *dst, struct page *src)
{
}
Linus Torvalds's avatar
Linus Torvalds committed
134

135 136
#define hugetlb_change_protection(vma, address, end, newprot)

137 138 139 140 141 142 143
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();
}

144 145 146 147 148 149 150
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
151 152
#endif /* !CONFIG_HUGETLB_PAGE */

153 154
#define HUGETLB_ANON_FILE "anon_hugepage"

155 156 157 158 159 160
enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
161 162 163 164 165
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
166 167
};

Linus Torvalds's avatar
Linus Torvalds committed
168 169 170 171 172
#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
173
	struct hstate *hstate;
174
	struct hugepage_subpool *spool;
Linus Torvalds's avatar
Linus Torvalds committed
175 176 177 178 179 180 181
};

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

182
extern const struct file_operations hugetlbfs_file_operations;
183
extern const struct vm_operations_struct hugetlb_vm_ops;
184 185
struct file *hugetlb_file_setup(const char *name, unsigned long addr,
				size_t size, vm_flags_t acct,
186
				struct user_struct **user, int creat_flags);
Linus Torvalds's avatar
Linus Torvalds committed
187 188 189

static inline int is_file_hugepages(struct file *file)
{
190 191 192 193 194 195
	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
196 197 198 199
}

#else /* !CONFIG_HUGETLBFS */

200
#define is_file_hugepages(file)			0
201 202
static inline struct file *
hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
203
		vm_flags_t acctflag, struct user_struct **user, int creat_flags)
204 205 206
{
	return ERR_PTR(-ENOSYS);
}
Linus Torvalds's avatar
Linus Torvalds committed
207 208 209

#endif /* !CONFIG_HUGETLBFS */

210 211 212 213 214 215
#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 */

216 217
#ifdef CONFIG_HUGETLB_PAGE

218
#define HSTATE_NAME_LEN 32
219 220
/* Defines one hugetlb page size */
struct hstate {
221 222
	int next_nid_to_alloc;
	int next_nid_to_free;
223 224 225 226 227 228 229 230
	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;
231
	struct list_head hugepage_activelist;
232 233 234 235
	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];
236 237 238 239
#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files[5];
#endif
240
	char name[HSTATE_NAME_LEN];
241 242
};

243 244 245
struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
246 247 248
#ifdef CONFIG_HIGHMEM
	phys_addr_t phys;
#endif
249 250
};

251 252
struct page *alloc_huge_page_node(struct hstate *h, int nid);

253 254 255
/* arch callback */
int __init alloc_bootmem_huge_page(struct hstate *h);

256 257 258 259 260 261 262 263 264 265 266
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])
267

268
static inline struct hstate *hstate_inode(struct inode *i)
269
{
270 271 272
	struct hugetlbfs_sb_info *hsb;
	hsb = HUGETLBFS_SB(i->i_sb);
	return hsb->hstate;
273 274 275 276
}

static inline struct hstate *hstate_file(struct file *f)
{
277
	return hstate_inode(f->f_dentry->d_inode);
278 279
}

280
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
281
{
282
	return hstate_file(vma->vm_file);
283 284 285 286 287 288 289
}

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

290 291
extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

292 293
extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320
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>

321 322 323 324 325 326 327 328
#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

329 330 331 332 333
static inline struct hstate *page_hstate(struct page *page)
{
	return size_to_hstate(PAGE_SIZE << compound_order(page));
}

334 335 336 337 338
static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

339 340 341 342 343
static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

344 345
#else
struct hstate {};
346
#define alloc_huge_page_node(h, nid) NULL
347
#define alloc_bootmem_huge_page(h) NULL
348 349 350 351 352
#define hstate_file(f) NULL
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
353
#define vma_kernel_pagesize(v) PAGE_SIZE
354
#define vma_mmu_pagesize(v) PAGE_SIZE
355 356
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
357 358 359 360
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}
361
#define hstate_index_to_shift(index) 0
362
#define hstate_index(h) 0
363 364
#endif

Linus Torvalds's avatar
Linus Torvalds committed
365
#endif /* _LINUX_HUGETLB_H */