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