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
   8 struct ctl_table;
   9 struct user_struct;
  10
  11 #ifdef CONFIG_HUGETLB_PAGE
  12
  13 #include <linux/mempolicy.h>
  14 #include <linux/shm.h>
  15 #include <asm/tlbflush.h>
  16
  17 int PageHuge(struct page *page);
  18
  19 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  20 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  21 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  22 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  23
  24 #ifdef CONFIG_NUMA
  25 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  26                                         void __user *, size_t *, loff_t *);
  27 #endif
  28
  29 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  30 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  31                         struct page **, struct vm_area_struct **,
  32                         unsigned long *, int *, int, unsigned int flags);
  33 void unmap_hugepage_range(struct vm_area_struct *,
  34                         unsigned long, unsigned long, struct page *);
  35 void __unmap_hugepage_range(struct vm_area_struct *,
  36                         unsigned long, unsigned long, struct page *);
  37 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  38 void hugetlb_report_meminfo(struct seq_file *);
  39 int hugetlb_report_node_meminfo(int, char *);
  40 unsigned long hugetlb_total_pages(void);
  41 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  42                         unsigned long address, unsigned int flags);
  43 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  44                                                 struct vm_area_struct *vma,
  45                                                 vm_flags_t vm_flags);
  46 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  47 int dequeue_hwpoisoned_huge_page(struct page *page);
  48 void copy_huge_page(struct page *dst, struct page *src);
  49
  50 extern unsigned long hugepages_treat_as_movable;
  51 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  52 extern int sysctl_hugetlb_shm_group;
  53 extern struct list_head huge_boot_pages;
  54
  55 /* arch callbacks */
  56
  57 pte_t *huge_pte_alloc(struct mm_struct *mm,
  58                         unsigned long addr, unsigned long sz);
  59 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  60 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  61 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  62                               int write);
  63 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  64                                 pmd_t *pmd, int write);
  65 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  66                                 pud_t *pud, int write);
  67 int pmd_huge(pmd_t pmd);
  68 int pud_huge(pud_t pmd);
  69 void hugetlb_change_protection(struct vm_area_struct *vma,
  70                 unsigned long address, unsigned long end, pgprot_t newprot);
  71
  72 #else /* !CONFIG_HUGETLB_PAGE */
  73
  74 static inline int PageHuge(struct page *page)
  75 {
  76         return 0;
  77 }
  78
  79 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  80 {
  81 }
  82
  83 static inline unsigned long hugetlb_total_pages(void)
  84 {
  85         return 0;
  86 }
  87
  88 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  89 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  90 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  91 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  92 #define unmap_hugepage_range(vma, start, end, page)     BUG()
  93 static inline void hugetlb_report_meminfo(struct seq_file *m)
  94 {
  95 }
  96 #define hugetlb_report_node_meminfo(n, buf)     0
  97 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  98 #define follow_huge_pud(mm, addr, pud, write)   NULL
  99 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
 100 #define pmd_huge(x)     0
 101 #define pud_huge(x)     0
 102 #define is_hugepage_only_range(mm, addr, len)   0
 103 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 104 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 105 #define huge_pte_offset(mm, address)    0
 106 #define dequeue_hwpoisoned_huge_page(page)      0
 107 static inline void copy_huge_page(struct page *dst, struct page *src)
 108 {
 109 }
 110
 111 #define hugetlb_change_protection(vma, address, end, newprot)
 112
 113 #ifndef HPAGE_MASK
 114 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 115 #define HPAGE_SIZE      PAGE_SIZE
 116 #endif
 117
 118 #endif /* !CONFIG_HUGETLB_PAGE */
 119
 120 #define HUGETLB_ANON_FILE "anon_hugepage"
 121
 122 enum {
 123         /*
 124          * The file will be used as an shm file so shmfs accounting rules
 125          * apply
 126          */
 127         HUGETLB_SHMFS_INODE     = 1,
 128         /*
 129          * The file is being created on the internal vfs mount and shmfs
 130          * accounting rules do not apply
 131          */
 132         HUGETLB_ANONHUGE_INODE  = 2,
 133 };
 134
 135 #ifdef CONFIG_HUGETLBFS
 136 struct hugetlbfs_config {
 137         uid_t   uid;
 138         gid_t   gid;
 139         umode_t mode;
 140         long    nr_blocks;
 141         long    nr_inodes;
 142         struct hstate *hstate;
 143 };
 144
 145 struct hugetlbfs_sb_info {
 146         long    max_blocks;   /* blocks allowed */
 147         long    free_blocks;  /* blocks free */
 148         long    max_inodes;   /* inodes allowed */
 149         long    free_inodes;  /* inodes free */
 150         spinlock_t      stat_lock;
 151         struct hstate *hstate;
 152 };
 153
 154
 155 struct hugetlbfs_inode_info {
 156         struct shared_policy policy;
 157         struct inode vfs_inode;
 158 };
 159
 160 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 161 {
 162         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 163 }
 164
 165 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 166 {
 167         return sb->s_fs_info;
 168 }
 169
 170 extern const struct file_operations hugetlbfs_file_operations;
 171 extern const struct vm_operations_struct hugetlb_vm_ops;
 172 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
 173                                 struct user_struct **user, int creat_flags);
 174 int hugetlb_get_quota(struct address_space *mapping, long delta);
 175 void hugetlb_put_quota(struct address_space *mapping, long delta);
 176
 177 static inline int is_file_hugepages(struct file *file)
 178 {
 179         if (file->f_op == &hugetlbfs_file_operations)
 180                 return 1;
 181         if (is_file_shm_hugepages(file))
 182                 return 1;
 183
 184         return 0;
 185 }
 186
 187 static inline void set_file_hugepages(struct file *file)
 188 {
 189         file->f_op = &hugetlbfs_file_operations;
 190 }
 191 #else /* !CONFIG_HUGETLBFS */
 192
 193 #define is_file_hugepages(file)                 0
 194 #define set_file_hugepages(file)                BUG()
 195 static inline struct file *hugetlb_file_setup(const char *name, size_t size,
 196                 vm_flags_t acctflag, struct user_struct **user, int creat_flags)
 197 {
 198         return ERR_PTR(-ENOSYS);
 199 }
 200
 201 #endif /* !CONFIG_HUGETLBFS */
 202
 203 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 204 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 205                                         unsigned long len, unsigned long pgoff,
 206                                         unsigned long flags);
 207 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 208
 209 #ifdef CONFIG_HUGETLB_PAGE
 210
 211 #define HSTATE_NAME_LEN 32
 212 /* Defines one hugetlb page size */
 213 struct hstate {
 214         int next_nid_to_alloc;
 215         int next_nid_to_free;
 216         unsigned int order;
 217         unsigned long mask;
 218         unsigned long max_huge_pages;
 219         unsigned long nr_huge_pages;
 220         unsigned long free_huge_pages;
 221         unsigned long resv_huge_pages;
 222         unsigned long surplus_huge_pages;
 223         unsigned long nr_overcommit_huge_pages;
 224         struct list_head hugepage_freelists[MAX_NUMNODES];
 225         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 226         unsigned int free_huge_pages_node[MAX_NUMNODES];
 227         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 228         char name[HSTATE_NAME_LEN];
 229 };
 230
 231 struct huge_bootmem_page {
 232         struct list_head list;
 233         struct hstate *hstate;
 234 };
 235
 236 struct page *alloc_huge_page_node(struct hstate *h, int nid);
 237
 238 /* arch callback */
 239 int __init alloc_bootmem_huge_page(struct hstate *h);
 240
 241 void __init hugetlb_add_hstate(unsigned order);
 242 struct hstate *size_to_hstate(unsigned long size);
 243
 244 #ifndef HUGE_MAX_HSTATE
 245 #define HUGE_MAX_HSTATE 1
 246 #endif
 247
 248 extern struct hstate hstates[HUGE_MAX_HSTATE];
 249 extern unsigned int default_hstate_idx;
 250
 251 #define default_hstate (hstates[default_hstate_idx])
 252
 253 static inline struct hstate *hstate_inode(struct inode *i)
 254 {
 255         struct hugetlbfs_sb_info *hsb;
 256         hsb = HUGETLBFS_SB(i->i_sb);
 257         return hsb->hstate;
 258 }
 259
 260 static inline struct hstate *hstate_file(struct file *f)
 261 {
 262         return hstate_inode(f->f_dentry->d_inode);
 263 }
 264
 265 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 266 {
 267         return hstate_file(vma->vm_file);
 268 }
 269
 270 static inline unsigned long huge_page_size(struct hstate *h)
 271 {
 272         return (unsigned long)PAGE_SIZE << h->order;
 273 }
 274
 275 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 276
 277 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 278
 279 static inline unsigned long huge_page_mask(struct hstate *h)
 280 {
 281         return h->mask;
 282 }
 283
 284 static inline unsigned int huge_page_order(struct hstate *h)
 285 {
 286         return h->order;
 287 }
 288
 289 static inline unsigned huge_page_shift(struct hstate *h)
 290 {
 291         return h->order + PAGE_SHIFT;
 292 }
 293
 294 static inline unsigned int pages_per_huge_page(struct hstate *h)
 295 {
 296         return 1 << h->order;
 297 }
 298
 299 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 300 {
 301         return huge_page_size(h) / 512;
 302 }
 303
 304 #include <asm/hugetlb.h>
 305
 306 static inline struct hstate *page_hstate(struct page *page)
 307 {
 308         return size_to_hstate(PAGE_SIZE << compound_order(page));
 309 }
 310
 311 static inline unsigned hstate_index_to_shift(unsigned index)
 312 {
 313         return hstates[index].order + PAGE_SHIFT;
 314 }
 315
 316 #else
 317 struct hstate {};
 318 #define alloc_huge_page_node(h, nid) NULL
 319 #define alloc_bootmem_huge_page(h) NULL
 320 #define hstate_file(f) NULL
 321 #define hstate_vma(v) NULL
 322 #define hstate_inode(i) NULL
 323 #define huge_page_size(h) PAGE_SIZE
 324 #define huge_page_mask(h) PAGE_MASK
 325 #define vma_kernel_pagesize(v) PAGE_SIZE
 326 #define vma_mmu_pagesize(v) PAGE_SIZE
 327 #define huge_page_order(h) 0
 328 #define huge_page_shift(h) PAGE_SHIFT
 329 static inline unsigned int pages_per_huge_page(struct hstate *h)
 330 {
 331         return 1;
 332 }
 333 #define hstate_index_to_shift(index) 0
 334 #endif
 335
 336 #endif /* _LINUX_HUGETLB_H */