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