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