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 void hugetlb_report_meminfo(struct seq_file *);
  60 int hugetlb_report_node_meminfo(int, char *);
  61 void hugetlb_show_meminfo(void);
  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 bool isolate_huge_page(struct page *page, struct list_head *list);
  71 void putback_active_hugepage(struct page *page);
  72 bool is_hugepage_active(struct page *page);
  73
  74 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
  75 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
  76 #endif
  77
  78 extern unsigned long hugepages_treat_as_movable;
  79 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  80 extern int sysctl_hugetlb_shm_group;
  81 extern struct list_head huge_boot_pages;
  82
  83 /* arch callbacks */
  84
  85 pte_t *huge_pte_alloc(struct mm_struct *mm,
  86                         unsigned long addr, unsigned long sz);
  87 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  88 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  89 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  90                               int write);
  91 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  92                                 pmd_t *pmd, int write);
  93 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  94                                 pud_t *pud, int write);
  95 int pmd_huge(pmd_t pmd);
  96 int pud_huge(pud_t pmd);
  97 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
  98                 unsigned long address, unsigned long end, pgprot_t newprot);
  99
 100 #else /* !CONFIG_HUGETLB_PAGE */
 101
 102 static inline int PageHuge(struct page *page)
 103 {
 104         return 0;
 105 }
 106
 107 static inline int PageHeadHuge(struct page *page_head)
 108 {
 109         return 0;
 110 }
 111
 112 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 113 {
 114 }
 115
 116 static inline unsigned long hugetlb_total_pages(void)
 117 {
 118         return 0;
 119 }
 120
 121 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
 122 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 123 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 124 static inline void hugetlb_report_meminfo(struct seq_file *m)
 125 {
 126 }
 127 #define hugetlb_report_node_meminfo(n, buf)     0
 128 static inline void hugetlb_show_meminfo(void)
 129 {
 130 }
 131 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
 132 #define follow_huge_pud(mm, addr, pud, write)   NULL
 133 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
 134 #define pmd_huge(x)     0
 135 #define pud_huge(x)     0
 136 #define is_hugepage_only_range(mm, addr, len)   0
 137 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 138 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 139 #define huge_pte_offset(mm, address)    0
 140 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
 141 {
 142         return 0;
 143 }
 144
 145 #define isolate_huge_page(p, l) false
 146 #define putback_active_hugepage(p)      do {} while (0)
 147 #define is_hugepage_active(x)   false
 148
 149 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 150                 unsigned long address, unsigned long end, pgprot_t newprot)
 151 {
 152         return 0;
 153 }
 154
 155 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
 156                         struct vm_area_struct *vma, unsigned long start,
 157                         unsigned long end, struct page *ref_page)
 158 {
 159         BUG();
 160 }
 161
 162 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
 163                         struct vm_area_struct *vma, unsigned long start,
 164                         unsigned long end, struct page *ref_page)
 165 {
 166         BUG();
 167 }
 168
 169 #endif /* !CONFIG_HUGETLB_PAGE */
 170
 171 #define HUGETLB_ANON_FILE "anon_hugepage"
 172
 173 enum {
 174         /*
 175          * The file will be used as an shm file so shmfs accounting rules
 176          * apply
 177          */
 178         HUGETLB_SHMFS_INODE     = 1,
 179         /*
 180          * The file is being created on the internal vfs mount and shmfs
 181          * accounting rules do not apply
 182          */
 183         HUGETLB_ANONHUGE_INODE  = 2,
 184 };
 185
 186 #ifdef CONFIG_HUGETLBFS
 187 struct hugetlbfs_sb_info {
 188         long    max_inodes;   /* inodes allowed */
 189         long    free_inodes;  /* inodes free */
 190         spinlock_t      stat_lock;
 191         struct hstate *hstate;
 192         struct hugepage_subpool *spool;
 193 };
 194
 195 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 196 {
 197         return sb->s_fs_info;
 198 }
 199
 200 extern const struct file_operations hugetlbfs_file_operations;
 201 extern const struct vm_operations_struct hugetlb_vm_ops;
 202 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
 203                                 struct user_struct **user, int creat_flags,
 204                                 int page_size_log);
 205
 206 static inline int is_file_hugepages(struct file *file)
 207 {
 208         if (file->f_op == &hugetlbfs_file_operations)
 209                 return 1;
 210         if (is_file_shm_hugepages(file))
 211                 return 1;
 212
 213         return 0;
 214 }
 215
 216
 217 #else /* !CONFIG_HUGETLBFS */
 218
 219 #define is_file_hugepages(file)                 0
 220 static inline struct file *
 221 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
 222                 struct user_struct **user, int creat_flags,
 223                 int page_size_log)
 224 {
 225         return ERR_PTR(-ENOSYS);
 226 }
 227
 228 #endif /* !CONFIG_HUGETLBFS */
 229
 230 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 231 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 232                                         unsigned long len, unsigned long pgoff,
 233                                         unsigned long flags);
 234 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 235
 236 #ifdef CONFIG_HUGETLB_PAGE
 237
 238 #define HSTATE_NAME_LEN 32
 239 /* Defines one hugetlb page size */
 240 struct hstate {
 241         int next_nid_to_alloc;
 242         int next_nid_to_free;
 243         unsigned int order;
 244         unsigned long mask;
 245         unsigned long max_huge_pages;
 246         unsigned long nr_huge_pages;
 247         unsigned long free_huge_pages;
 248         unsigned long resv_huge_pages;
 249         unsigned long surplus_huge_pages;
 250         unsigned long nr_overcommit_huge_pages;
 251         struct list_head hugepage_activelist;
 252         struct list_head hugepage_freelists[MAX_NUMNODES];
 253         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 254         unsigned int free_huge_pages_node[MAX_NUMNODES];
 255         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 256 #ifdef CONFIG_CGROUP_HUGETLB
 257         /* cgroup control files */
 258         struct cftype cgroup_files[5];
 259 #endif
 260         char name[HSTATE_NAME_LEN];
 261 };
 262
 263 struct huge_bootmem_page {
 264         struct list_head list;
 265         struct hstate *hstate;
 266 #ifdef CONFIG_HIGHMEM
 267         phys_addr_t phys;
 268 #endif
 269 };
 270
 271 struct page *alloc_huge_page_node(struct hstate *h, int nid);
 272 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
 273                                 unsigned long addr, int avoid_reserve);
 274
 275 /* arch callback */
 276 int __init alloc_bootmem_huge_page(struct hstate *h);
 277
 278 void __init hugetlb_add_hstate(unsigned order);
 279 struct hstate *size_to_hstate(unsigned long size);
 280
 281 #ifndef HUGE_MAX_HSTATE
 282 #define HUGE_MAX_HSTATE 1
 283 #endif
 284
 285 extern struct hstate hstates[HUGE_MAX_HSTATE];
 286 extern unsigned int default_hstate_idx;
 287
 288 #define default_hstate (hstates[default_hstate_idx])
 289
 290 static inline struct hstate *hstate_inode(struct inode *i)
 291 {
 292         struct hugetlbfs_sb_info *hsb;
 293         hsb = HUGETLBFS_SB(i->i_sb);
 294         return hsb->hstate;
 295 }
 296
 297 static inline struct hstate *hstate_file(struct file *f)
 298 {
 299         return hstate_inode(file_inode(f));
 300 }
 301
 302 static inline struct hstate *hstate_sizelog(int page_size_log)
 303 {
 304         if (!page_size_log)
 305                 return &default_hstate;
 306         return size_to_hstate(1 << page_size_log);
 307 }
 308
 309 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 310 {
 311         return hstate_file(vma->vm_file);
 312 }
 313
 314 static inline unsigned long huge_page_size(struct hstate *h)
 315 {
 316         return (unsigned long)PAGE_SIZE << h->order;
 317 }
 318
 319 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 320
 321 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 322
 323 static inline unsigned long huge_page_mask(struct hstate *h)
 324 {
 325         return h->mask;
 326 }
 327
 328 static inline unsigned int huge_page_order(struct hstate *h)
 329 {
 330         return h->order;
 331 }
 332
 333 static inline unsigned huge_page_shift(struct hstate *h)
 334 {
 335         return h->order + PAGE_SHIFT;
 336 }
 337
 338 static inline unsigned int pages_per_huge_page(struct hstate *h)
 339 {
 340         return 1 << h->order;
 341 }
 342
 343 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 344 {
 345         return huge_page_size(h) / 512;
 346 }
 347
 348 #include <asm/hugetlb.h>
 349
 350 #ifndef arch_make_huge_pte
 351 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 352                                        struct page *page, int writable)
 353 {
 354         return entry;
 355 }
 356 #endif
 357
 358 static inline struct hstate *page_hstate(struct page *page)
 359 {
 360         return size_to_hstate(PAGE_SIZE << compound_order(page));
 361 }
 362
 363 static inline unsigned hstate_index_to_shift(unsigned index)
 364 {
 365         return hstates[index].order + PAGE_SHIFT;
 366 }
 367
 368 static inline int hstate_index(struct hstate *h)
 369 {
 370         return h - hstates;
 371 }
 372
 373 pgoff_t __basepage_index(struct page *page);
 374
 375 /* Return page->index in PAGE_SIZE units */
 376 static inline pgoff_t basepage_index(struct page *page)
 377 {
 378         if (!PageCompound(page))
 379                 return page->index;
 380
 381         return __basepage_index(page);
 382 }
 383
 384 extern void dissolve_free_huge_pages(unsigned long start_pfn,
 385                                      unsigned long end_pfn);
 386 int pmd_huge_support(void);
 387 /*
 388  * Currently hugepage migration is enabled only for pmd-based hugepage.
 389  * This function will be updated when hugepage migration is more widely
 390  * supported.
 391  */
 392 static inline int hugepage_migration_support(struct hstate *h)
 393 {
 394         return pmd_huge_support() && (huge_page_shift(h) == PMD_SHIFT);
 395 }
 396
 397 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 398                                            struct mm_struct *mm, pte_t *pte)
 399 {
 400         if (huge_page_size(h) == PMD_SIZE)
 401                 return pmd_lockptr(mm, (pmd_t *) pte);
 402         VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
 403         return &mm->page_table_lock;
 404 }
 405
 406 #else   /* CONFIG_HUGETLB_PAGE */
 407 struct hstate {};
 408 #define alloc_huge_page_node(h, nid) NULL
 409 #define alloc_huge_page_noerr(v, a, r) NULL
 410 #define alloc_bootmem_huge_page(h) NULL
 411 #define hstate_file(f) NULL
 412 #define hstate_sizelog(s) NULL
 413 #define hstate_vma(v) NULL
 414 #define hstate_inode(i) NULL
 415 #define page_hstate(page) NULL
 416 #define huge_page_size(h) PAGE_SIZE
 417 #define huge_page_mask(h) PAGE_MASK
 418 #define vma_kernel_pagesize(v) PAGE_SIZE
 419 #define vma_mmu_pagesize(v) PAGE_SIZE
 420 #define huge_page_order(h) 0
 421 #define huge_page_shift(h) PAGE_SHIFT
 422 static inline unsigned int pages_per_huge_page(struct hstate *h)
 423 {
 424         return 1;
 425 }
 426 #define hstate_index_to_shift(index) 0
 427 #define hstate_index(h) 0
 428
 429 static inline pgoff_t basepage_index(struct page *page)
 430 {
 431         return page->index;
 432 }
 433 #define dissolve_free_huge_pages(s, e)  do {} while (0)
 434 #define pmd_huge_support()      0
 435 #define hugepage_migration_support(h)   0
 436
 437 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 438                                            struct mm_struct *mm, pte_t *pte)
 439 {
 440         return &mm->page_table_lock;
 441 }
 442 #endif  /* CONFIG_HUGETLB_PAGE */
 443
 444 static inline spinlock_t *huge_pte_lock(struct hstate *h,
 445                                         struct mm_struct *mm, pte_t *pte)
 446 {
 447         spinlock_t *ptl;
 448
 449         ptl = huge_pte_lockptr(h, mm, pte);
 450         spin_lock(ptl);
 451         return ptl;
 452 }
 453
 454 #endif /* _LINUX_HUGETLB_H */