include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #include <linux/mm_types.h>
   5 #include <linux/fs.h>
   6 #include <linux/hugetlb_inline.h>
   7 #include <linux/cgroup.h>
   8
   9 struct ctl_table;
  10 struct user_struct;
  11 struct mmu_gather;
  12
  13 #ifdef CONFIG_HUGETLB_PAGE
  14
  15 #include <linux/mempolicy.h>
  16 #include <linux/shm.h>
  17 #include <asm/tlbflush.h>
  18
  19 struct hugepage_subpool {
  20         spinlock_t lock;
  21         long count;
  22         long max_hpages, used_hpages;
  23 };
  24
  25 extern spinlock_t hugetlb_lock;
  26 extern int hugetlb_max_hstate __read_mostly;
  27 #define for_each_hstate(h) \
  28         for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
  29
  30 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
  31 void hugepage_put_subpool(struct hugepage_subpool *spool);
  32
  33 int PageHuge(struct page *page);
  34 int PageHeadHuge(struct page *page_head);
  35
  36 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  37 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  38 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  39 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  40
  41 #ifdef CONFIG_NUMA
  42 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  43                                         void __user *, size_t *, loff_t *);
  44 #endif
  45
  46 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  47 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  48                          struct page **, struct vm_area_struct **,
  49                          unsigned long *, unsigned long *, long, unsigned int);
  50 void unmap_hugepage_range(struct vm_area_struct *,
  51                           unsigned long, unsigned long, struct page *);
  52 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
  53                           struct vm_area_struct *vma,
  54                           unsigned long start, unsigned long end,
  55                           struct page *ref_page);
  56 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
  57                                 unsigned long start, unsigned long end,
  58                                 struct page *ref_page);
  59 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  60 void hugetlb_report_meminfo(struct seq_file *);
  61 int hugetlb_report_node_meminfo(int, char *);
  62 void hugetlb_show_meminfo(void);
  63 unsigned long hugetlb_total_pages(void);
  64 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  65                         unsigned long address, unsigned int flags);
  66 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  67                                                 struct vm_area_struct *vma,
  68                                                 vm_flags_t vm_flags);
  69 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  70 int dequeue_hwpoisoned_huge_page(struct page *page);
  71 void copy_huge_page(struct page *dst, struct page *src);
  72
  73 extern unsigned long hugepages_treat_as_movable;
  74 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  75 extern int sysctl_hugetlb_shm_group;
  76 extern struct list_head huge_boot_pages;
  77
  78 /* arch callbacks */
  79
  80 pte_t *huge_pte_alloc(struct mm_struct *mm,
  81                         unsigned long addr, unsigned long sz);
  82 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  83 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  84 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  85                               int write);
  86 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  87                                 pmd_t *pmd, int write);
  88 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  89                                 pud_t *pud, int write);
  90 int pmd_huge(pmd_t pmd);
  91 int pud_huge(pud_t pmd);
  92 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
  93                 unsigned long address, unsigned long end, pgprot_t newprot);
  94
  95 #else /* !CONFIG_HUGETLB_PAGE */
  96
  97 static inline int PageHuge(struct page *page)
  98 {
  99         return 0;
 100 }
 101
 102 static inline int PageHeadHuge(struct page *page_head)
 103 {
 104         return 0;
 105 }
 106
 107 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 108 {
 109 }
 110
 111 static inline unsigned long hugetlb_total_pages(void)
 112 {
 113         return 0;
 114 }
 115
 116 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
 117 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 118 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 119 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
 120 static inline void hugetlb_report_meminfo(struct seq_file *m)
 121 {
 122 }
 123 #define hugetlb_report_node_meminfo(n, buf)     0
 124 static inline void hugetlb_show_meminfo(void)
 125 {
 126 }
 127 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
 128 #define follow_huge_pud(mm, addr, pud, write)   NULL
 129 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
 130 #define pmd_huge(x)     0
 131 #define pud_huge(x)     0
 132 #define is_hugepage_only_range(mm, addr, len)   0
 133 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 134 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 135 #define huge_pte_offset(mm, address)    0
 136 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
 137 {
 138         return 0;
 139 }
 140
 141 static inline void copy_huge_page(struct page *dst, struct page *src)
 142 {
 143 }
 144
 145 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 146                 unsigned long address, unsigned long end, pgprot_t newprot)
 147 {
 148         return 0;
 149 }
 150
 151 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
 152                         struct vm_area_struct *vma, unsigned long start,
 153                         unsigned long end, struct page *ref_page)
 154 {
 155         BUG();
 156 }
 157
 158 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
 159                         struct vm_area_struct *vma, unsigned long start,
 160                         unsigned long end, struct page *ref_page)
 161 {
 162         BUG();
 163 }
 164
 165 #endif /* !CONFIG_HUGETLB_PAGE */
 166
 167 #define HUGETLB_ANON_FILE "anon_hugepage"
 168
 169 enum {
 170         /*
 171          * The file will be used as an shm file so shmfs accounting rules
 172          * apply
 173          */
 174         HUGETLB_SHMFS_INODE     = 1,
 175         /*
 176          * The file is being created on the internal vfs mount and shmfs
 177          * accounting rules do not apply
 178          */
 179         HUGETLB_ANONHUGE_INODE  = 2,
 180 };
 181
 182 #ifdef CONFIG_HUGETLBFS
 183 struct hugetlbfs_sb_info {
 184         long    max_inodes;   /* inodes allowed */
 185         long    free_inodes;  /* inodes free */
 186         spinlock_t      stat_lock;
 187         struct hstate *hstate;
 188         struct hugepage_subpool *spool;
 189 };
 190
 191 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 192 {
 193         return sb->s_fs_info;
 194 }
 195
 196 extern const struct file_operations hugetlbfs_file_operations;
 197 extern const struct vm_operations_struct hugetlb_vm_ops;
 198 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
 199                                 struct user_struct **user, int creat_flags,
 200                                 int page_size_log);
 201
 202 static inline int is_file_hugepages(struct file *file)
 203 {
 204         if (file->f_op == &hugetlbfs_file_operations)
 205                 return 1;
 206         if (is_file_shm_hugepages(file))
 207                 return 1;
 208
 209         return 0;
 210 }
 211
 212
 213 #else /* !CONFIG_HUGETLBFS */
 214
 215 #define is_file_hugepages(file)                 0
 216 static inline struct file *
 217 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
 218                 struct user_struct **user, int creat_flags,
 219                 int page_size_log)
 220 {
 221         return ERR_PTR(-ENOSYS);
 222 }
 223
 224 #endif /* !CONFIG_HUGETLBFS */
 225
 226 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 227 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 228                                         unsigned long len, unsigned long pgoff,
 229                                         unsigned long flags);
 230 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 231
 232 #ifdef CONFIG_HUGETLB_PAGE
 233
 234 #define HSTATE_NAME_LEN 32
 235 /* Defines one hugetlb page size */
 236 struct hstate {
 237         int next_nid_to_alloc;
 238         int next_nid_to_free;
 239         unsigned int order;
 240         unsigned long mask;
 241         unsigned long max_huge_pages;
 242         unsigned long nr_huge_pages;
 243         unsigned long free_huge_pages;
 244         unsigned long resv_huge_pages;
 245         unsigned long surplus_huge_pages;
 246         unsigned long nr_overcommit_huge_pages;
 247         struct list_head hugepage_activelist;
 248         struct list_head hugepage_freelists[MAX_NUMNODES];
 249         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 250         unsigned int free_huge_pages_node[MAX_NUMNODES];
 251         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 252 #ifdef CONFIG_CGROUP_HUGETLB
 253         /* cgroup control files */
 254         struct cftype cgroup_files[5];
 255 #endif
 256         char name[HSTATE_NAME_LEN];
 257 };
 258
 259 struct huge_bootmem_page {
 260         struct list_head list;
 261         struct hstate *hstate;
 262 #ifdef CONFIG_HIGHMEM
 263         phys_addr_t phys;
 264 #endif
 265 };
 266
 267 struct page *alloc_huge_page_node(struct hstate *h, int nid);
 268
 269 /* arch callback */
 270 int __init alloc_bootmem_huge_page(struct hstate *h);
 271
 272 void __init hugetlb_add_hstate(unsigned order);
 273 struct hstate *size_to_hstate(unsigned long size);
 274
 275 #ifndef HUGE_MAX_HSTATE
 276 #define HUGE_MAX_HSTATE 1
 277 #endif
 278
 279 extern struct hstate hstates[HUGE_MAX_HSTATE];
 280 extern unsigned int default_hstate_idx;
 281
 282 #define default_hstate (hstates[default_hstate_idx])
 283
 284 static inline struct hstate *hstate_inode(struct inode *i)
 285 {
 286         struct hugetlbfs_sb_info *hsb;
 287         hsb = HUGETLBFS_SB(i->i_sb);
 288         return hsb->hstate;
 289 }
 290
 291 static inline struct hstate *hstate_file(struct file *f)
 292 {
 293         return hstate_inode(file_inode(f));
 294 }
 295
 296 static inline struct hstate *hstate_sizelog(int page_size_log)
 297 {
 298         if (!page_size_log)
 299                 return &default_hstate;
 300         return size_to_hstate(1 << page_size_log);
 301 }
 302
 303 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 304 {
 305         return hstate_file(vma->vm_file);
 306 }
 307
 308 static inline unsigned long huge_page_size(struct hstate *h)
 309 {
 310         return (unsigned long)PAGE_SIZE << h->order;
 311 }
 312
 313 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 314
 315 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 316
 317 static inline unsigned long huge_page_mask(struct hstate *h)
 318 {
 319         return h->mask;
 320 }
 321
 322 static inline unsigned int huge_page_order(struct hstate *h)
 323 {
 324         return h->order;
 325 }
 326
 327 static inline unsigned huge_page_shift(struct hstate *h)
 328 {
 329         return h->order + PAGE_SHIFT;
 330 }
 331
 332 static inline unsigned int pages_per_huge_page(struct hstate *h)
 333 {
 334         return 1 << h->order;
 335 }
 336
 337 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 338 {
 339         return huge_page_size(h) / 512;
 340 }
 341
 342 #include <asm/hugetlb.h>
 343
 344 #ifndef arch_make_huge_pte
 345 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 346                                        struct page *page, int writable)
 347 {
 348         return entry;
 349 }
 350 #endif
 351
 352 static inline struct hstate *page_hstate(struct page *page)
 353 {
 354         return size_to_hstate(PAGE_SIZE << compound_order(page));
 355 }
 356
 357 static inline unsigned hstate_index_to_shift(unsigned index)
 358 {
 359         return hstates[index].order + PAGE_SHIFT;
 360 }
 361
 362 static inline int hstate_index(struct hstate *h)
 363 {
 364         return h - hstates;
 365 }
 366
 367 pgoff_t __basepage_index(struct page *page);
 368
 369 /* Return page->index in PAGE_SIZE units */
 370 static inline pgoff_t basepage_index(struct page *page)
 371 {
 372         if (!PageCompound(page))
 373                 return page->index;
 374
 375         return __basepage_index(page);
 376 }
 377
 378 #else   /* CONFIG_HUGETLB_PAGE */
 379 struct hstate {};
 380 #define alloc_huge_page_node(h, nid) NULL
 381 #define alloc_bootmem_huge_page(h) NULL
 382 #define hstate_file(f) NULL
 383 #define hstate_sizelog(s) NULL
 384 #define hstate_vma(v) NULL
 385 #define hstate_inode(i) NULL
 386 #define huge_page_size(h) PAGE_SIZE
 387 #define huge_page_mask(h) PAGE_MASK
 388 #define vma_kernel_pagesize(v) PAGE_SIZE
 389 #define vma_mmu_pagesize(v) PAGE_SIZE
 390 #define huge_page_order(h) 0
 391 #define huge_page_shift(h) PAGE_SHIFT
 392 static inline unsigned int pages_per_huge_page(struct hstate *h)
 393 {
 394         return 1;
 395 }
 396 #define hstate_index_to_shift(index) 0
 397 #define hstate_index(h) 0
 398
 399 static inline pgoff_t basepage_index(struct page *page)
 400 {
 401         return page->index;
 402 }
 403 #endif  /* CONFIG_HUGETLB_PAGE */
 404
 405 #endif /* _LINUX_HUGETLB_H */