include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #include <linux/mm_types.h>
   5 #include <linux/mmdebug.h>
   6 #include <linux/fs.h>
   7 #include <linux/hugetlb_inline.h>
   8 #include <linux/cgroup.h>
   9 #include <linux/list.h>
  10 #include <linux/kref.h>
  11
  12 struct ctl_table;
  13 struct user_struct;
  14 struct mmu_gather;
  15
  16 #ifdef CONFIG_HUGETLB_PAGE
  17
  18 #include <linux/mempolicy.h>
  19 #include <linux/shm.h>
  20 #include <asm/tlbflush.h>
  21
  22 struct hugepage_subpool {
  23         spinlock_t lock;
  24         long count;
  25         long max_hpages, used_hpages;
  26 };
  27
  28 struct resv_map {
  29         struct kref refs;
  30         spinlock_t lock;
  31         struct list_head regions;
  32 };
  33 extern struct resv_map *resv_map_alloc(void);
  34 void resv_map_release(struct kref *ref);
  35
  36 extern spinlock_t hugetlb_lock;
  37 extern int hugetlb_max_hstate __read_mostly;
  38 #define for_each_hstate(h) \
  39         for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
  40
  41 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
  42 void hugepage_put_subpool(struct hugepage_subpool *spool);
  43
  44 int PageHuge(struct page *page);
  45
  46 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  47 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  48 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  49 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  50
  51 #ifdef CONFIG_NUMA
  52 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  53                                         void __user *, size_t *, loff_t *);
  54 #endif
  55
  56 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  57 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  58                          struct page **, struct vm_area_struct **,
  59                          unsigned long *, unsigned long *, long, unsigned int);
  60 void unmap_hugepage_range(struct vm_area_struct *,
  61                           unsigned long, unsigned long, struct page *);
  62 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
  63                           struct vm_area_struct *vma,
  64                           unsigned long start, unsigned long end,
  65                           struct page *ref_page);
  66 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
  67                                 unsigned long start, unsigned long end,
  68                                 struct page *ref_page);
  69 void hugetlb_report_meminfo(struct seq_file *);
  70 int hugetlb_report_node_meminfo(int, char *);
  71 void hugetlb_show_meminfo(void);
  72 unsigned long hugetlb_total_pages(void);
  73 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  74                         unsigned long address, unsigned int flags);
  75 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  76                                                 struct vm_area_struct *vma,
  77                                                 vm_flags_t vm_flags);
  78 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  79 int dequeue_hwpoisoned_huge_page(struct page *page);
  80 bool isolate_huge_page(struct page *page, struct list_head *list);
  81 void putback_active_hugepage(struct page *page);
  82 bool is_hugepage_active(struct page *page);
  83 void free_huge_page(struct page *page);
  84
  85 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
  86 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
  87 #endif
  88
  89 extern unsigned long hugepages_treat_as_movable;
  90 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  91 extern int sysctl_hugetlb_shm_group;
  92 extern struct list_head huge_boot_pages;
  93
  94 /* arch callbacks */
  95
  96 pte_t *huge_pte_alloc(struct mm_struct *mm,
  97                         unsigned long addr, unsigned long sz);
  98 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  99 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
 100 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
 101                               int write);
 102 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
 103                                 pmd_t *pmd, int write);
 104 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
 105                                 pud_t *pud, int write);
 106 int pmd_huge(pmd_t pmd);
 107 int pud_huge(pud_t pmd);
 108 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 109                 unsigned long address, unsigned long end, pgprot_t newprot);
 110
 111 #else /* !CONFIG_HUGETLB_PAGE */
 112
 113 static inline int PageHuge(struct page *page)
 114 {
 115         return 0;
 116 }
 117
 118 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 119 {
 120 }
 121
 122 static inline unsigned long hugetlb_total_pages(void)
 123 {
 124         return 0;
 125 }
 126
 127 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
 128 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 129 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 130 static inline void hugetlb_report_meminfo(struct seq_file *m)
 131 {
 132 }
 133 #define hugetlb_report_node_meminfo(n, buf)     0
 134 static inline void hugetlb_show_meminfo(void)
 135 {
 136 }
 137 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
 138 #define follow_huge_pud(mm, addr, pud, write)   NULL
 139 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
 140 #define pmd_huge(x)     0
 141 #define pud_huge(x)     0
 142 #define is_hugepage_only_range(mm, addr, len)   0
 143 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 144 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 145 #define huge_pte_offset(mm, address)    0
 146 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
 147 {
 148         return 0;
 149 }
 150
 151 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
 152 {
 153         return false;
 154 }
 155 #define putback_active_hugepage(p)      do {} while (0)
 156 #define is_hugepage_active(x)   false
 157
 158 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 159                 unsigned long address, unsigned long end, pgprot_t newprot)
 160 {
 161         return 0;
 162 }
 163
 164 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
 165                         struct vm_area_struct *vma, unsigned long start,
 166                         unsigned long end, struct page *ref_page)
 167 {
 168         BUG();
 169 }
 170
 171 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
 172                         struct vm_area_struct *vma, unsigned long start,
 173                         unsigned long end, struct page *ref_page)
 174 {
 175         BUG();
 176 }
 177
 178 #endif /* !CONFIG_HUGETLB_PAGE */
 179
 180 #define HUGETLB_ANON_FILE "anon_hugepage"
 181
 182 enum {
 183         /*
 184          * The file will be used as an shm file so shmfs accounting rules
 185          * apply
 186          */
 187         HUGETLB_SHMFS_INODE     = 1,
 188         /*
 189          * The file is being created on the internal vfs mount and shmfs
 190          * accounting rules do not apply
 191          */
 192         HUGETLB_ANONHUGE_INODE  = 2,
 193 };
 194
 195 #ifdef CONFIG_HUGETLBFS
 196 struct hugetlbfs_sb_info {
 197         long    max_inodes;   /* inodes allowed */
 198         long    free_inodes;  /* inodes free */
 199         spinlock_t      stat_lock;
 200         struct hstate *hstate;
 201         struct hugepage_subpool *spool;
 202 };
 203
 204 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 205 {
 206         return sb->s_fs_info;
 207 }
 208
 209 extern const struct file_operations hugetlbfs_file_operations;
 210 extern const struct vm_operations_struct hugetlb_vm_ops;
 211 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
 212                                 struct user_struct **user, int creat_flags,
 213                                 int page_size_log);
 214
 215 static inline int is_file_hugepages(struct file *file)
 216 {
 217         if (file->f_op == &hugetlbfs_file_operations)
 218                 return 1;
 219         if (is_file_shm_hugepages(file))
 220                 return 1;
 221
 222         return 0;
 223 }
 224
 225
 226 #else /* !CONFIG_HUGETLBFS */
 227
 228 #define is_file_hugepages(file)                 0
 229 static inline struct file *
 230 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
 231                 struct user_struct **user, int creat_flags,
 232                 int page_size_log)
 233 {
 234         return ERR_PTR(-ENOSYS);
 235 }
 236
 237 #endif /* !CONFIG_HUGETLBFS */
 238
 239 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 240 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 241                                         unsigned long len, unsigned long pgoff,
 242                                         unsigned long flags);
 243 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 244
 245 #ifdef CONFIG_HUGETLB_PAGE
 246
 247 #define HSTATE_NAME_LEN 32
 248 /* Defines one hugetlb page size */
 249 struct hstate {
 250         int next_nid_to_alloc;
 251         int next_nid_to_free;
 252         unsigned int order;
 253         unsigned long mask;
 254         unsigned long max_huge_pages;
 255         unsigned long nr_huge_pages;
 256         unsigned long free_huge_pages;
 257         unsigned long resv_huge_pages;
 258         unsigned long surplus_huge_pages;
 259         unsigned long nr_overcommit_huge_pages;
 260         struct list_head hugepage_activelist;
 261         struct list_head hugepage_freelists[MAX_NUMNODES];
 262         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 263         unsigned int free_huge_pages_node[MAX_NUMNODES];
 264         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 265 #ifdef CONFIG_CGROUP_HUGETLB
 266         /* cgroup control files */
 267         struct cftype cgroup_files[5];
 268 #endif
 269         char name[HSTATE_NAME_LEN];
 270 };
 271
 272 struct huge_bootmem_page {
 273         struct list_head list;
 274         struct hstate *hstate;
 275 #ifdef CONFIG_HIGHMEM
 276         phys_addr_t phys;
 277 #endif
 278 };
 279
 280 struct page *alloc_huge_page_node(struct hstate *h, int nid);
 281 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
 282                                 unsigned long addr, int avoid_reserve);
 283
 284 /* arch callback */
 285 int __init alloc_bootmem_huge_page(struct hstate *h);
 286
 287 void __init hugetlb_add_hstate(unsigned order);
 288 struct hstate *size_to_hstate(unsigned long size);
 289
 290 #ifndef HUGE_MAX_HSTATE
 291 #define HUGE_MAX_HSTATE 1
 292 #endif
 293
 294 extern struct hstate hstates[HUGE_MAX_HSTATE];
 295 extern unsigned int default_hstate_idx;
 296
 297 #define default_hstate (hstates[default_hstate_idx])
 298
 299 static inline struct hstate *hstate_inode(struct inode *i)
 300 {
 301         struct hugetlbfs_sb_info *hsb;
 302         hsb = HUGETLBFS_SB(i->i_sb);
 303         return hsb->hstate;
 304 }
 305
 306 static inline struct hstate *hstate_file(struct file *f)
 307 {
 308         return hstate_inode(file_inode(f));
 309 }
 310
 311 static inline struct hstate *hstate_sizelog(int page_size_log)
 312 {
 313         if (!page_size_log)
 314                 return &default_hstate;
 315         return size_to_hstate(1 << page_size_log);
 316 }
 317
 318 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 319 {
 320         return hstate_file(vma->vm_file);
 321 }
 322
 323 static inline unsigned long huge_page_size(struct hstate *h)
 324 {
 325         return (unsigned long)PAGE_SIZE << h->order;
 326 }
 327
 328 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 329
 330 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 331
 332 static inline unsigned long huge_page_mask(struct hstate *h)
 333 {
 334         return h->mask;
 335 }
 336
 337 static inline unsigned int huge_page_order(struct hstate *h)
 338 {
 339         return h->order;
 340 }
 341
 342 static inline unsigned huge_page_shift(struct hstate *h)
 343 {
 344         return h->order + PAGE_SHIFT;
 345 }
 346
 347 static inline bool hstate_is_gigantic(struct hstate *h)
 348 {
 349         return huge_page_order(h) >= MAX_ORDER;
 350 }
 351
 352 static inline unsigned int pages_per_huge_page(struct hstate *h)
 353 {
 354         return 1 << h->order;
 355 }
 356
 357 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 358 {
 359         return huge_page_size(h) / 512;
 360 }
 361
 362 #include <asm/hugetlb.h>
 363
 364 #ifndef arch_make_huge_pte
 365 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 366                                        struct page *page, int writable)
 367 {
 368         return entry;
 369 }
 370 #endif
 371
 372 static inline struct hstate *page_hstate(struct page *page)
 373 {
 374         VM_BUG_ON_PAGE(!PageHuge(page), page);
 375         return size_to_hstate(PAGE_SIZE << compound_order(page));
 376 }
 377
 378 static inline unsigned hstate_index_to_shift(unsigned index)
 379 {
 380         return hstates[index].order + PAGE_SHIFT;
 381 }
 382
 383 static inline int hstate_index(struct hstate *h)
 384 {
 385         return h - hstates;
 386 }
 387
 388 pgoff_t __basepage_index(struct page *page);
 389
 390 /* Return page->index in PAGE_SIZE units */
 391 static inline pgoff_t basepage_index(struct page *page)
 392 {
 393         if (!PageCompound(page))
 394                 return page->index;
 395
 396         return __basepage_index(page);
 397 }
 398
 399 extern void dissolve_free_huge_pages(unsigned long start_pfn,
 400                                      unsigned long end_pfn);
 401 static inline int hugepage_migration_supported(struct hstate *h)
 402 {
 403 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
 404         return huge_page_shift(h) == PMD_SHIFT;
 405 #else
 406         return 0;
 407 #endif
 408 }
 409
 410 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 411                                            struct mm_struct *mm, pte_t *pte)
 412 {
 413         if (huge_page_size(h) == PMD_SIZE)
 414                 return pmd_lockptr(mm, (pmd_t *) pte);
 415         VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
 416         return &mm->page_table_lock;
 417 }
 418
 419 static inline bool hugepages_supported(void)
 420 {
 421         /*
 422          * Some platform decide whether they support huge pages at boot
 423          * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
 424          * there is no such support
 425          */
 426         return HPAGE_SHIFT != 0;
 427 }
 428
 429 #else   /* CONFIG_HUGETLB_PAGE */
 430 struct hstate {};
 431 #define alloc_huge_page_node(h, nid) NULL
 432 #define alloc_huge_page_noerr(v, a, r) NULL
 433 #define alloc_bootmem_huge_page(h) NULL
 434 #define hstate_file(f) NULL
 435 #define hstate_sizelog(s) NULL
 436 #define hstate_vma(v) NULL
 437 #define hstate_inode(i) NULL
 438 #define page_hstate(page) NULL
 439 #define huge_page_size(h) PAGE_SIZE
 440 #define huge_page_mask(h) PAGE_MASK
 441 #define vma_kernel_pagesize(v) PAGE_SIZE
 442 #define vma_mmu_pagesize(v) PAGE_SIZE
 443 #define huge_page_order(h) 0
 444 #define huge_page_shift(h) PAGE_SHIFT
 445 static inline unsigned int pages_per_huge_page(struct hstate *h)
 446 {
 447         return 1;
 448 }
 449 #define hstate_index_to_shift(index) 0
 450 #define hstate_index(h) 0
 451
 452 static inline pgoff_t basepage_index(struct page *page)
 453 {
 454         return page->index;
 455 }
 456 #define dissolve_free_huge_pages(s, e)  do {} while (0)
 457 #define hugepage_migration_supported(h) 0
 458
 459 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 460                                            struct mm_struct *mm, pte_t *pte)
 461 {
 462         return &mm->page_table_lock;
 463 }
 464 #endif  /* CONFIG_HUGETLB_PAGE */
 465
 466 static inline spinlock_t *huge_pte_lock(struct hstate *h,
 467                                         struct mm_struct *mm, pte_t *pte)
 468 {
 469         spinlock_t *ptl;
 470
 471         ptl = huge_pte_lockptr(h, mm, pte);
 472         spin_lock(ptl);
 473         return ptl;
 474 }
 475
 476 #endif /* _LINUX_HUGETLB_H */