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