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