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