include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #include <linux/fs.h>
   5
   6 struct ctl_table;
   7 struct user_struct;
   8
   9 #ifdef CONFIG_HUGETLB_PAGE
  10
  11 #include <linux/mempolicy.h>
  12 #include <linux/shm.h>
  13 #include <asm/tlbflush.h>
  14
  15 int PageHuge(struct page *page);
  16
  17 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  18 {
  19         return vma->vm_flags & VM_HUGETLB;
  20 }
  21
  22 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  23 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  24 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  25 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  26 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  27 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  28                         struct page **, struct vm_area_struct **,
  29                         unsigned long *, int *, int, unsigned int flags);
  30 void unmap_hugepage_range(struct vm_area_struct *,
  31                         unsigned long, unsigned long, struct page *);
  32 void __unmap_hugepage_range(struct vm_area_struct *,
  33                         unsigned long, unsigned long, struct page *);
  34 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  35 void hugetlb_report_meminfo(struct seq_file *);
  36 int hugetlb_report_node_meminfo(int, char *);
  37 unsigned long hugetlb_total_pages(void);
  38 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  39                         unsigned long address, unsigned int flags);
  40 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  41                                                 struct vm_area_struct *vma,
  42                                                 int acctflags);
  43 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  44
  45 extern unsigned long hugepages_treat_as_movable;
  46 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  47 extern int sysctl_hugetlb_shm_group;
  48 extern struct list_head huge_boot_pages;
  49
  50 /* arch callbacks */
  51
  52 pte_t *huge_pte_alloc(struct mm_struct *mm,
  53                         unsigned long addr, unsigned long sz);
  54 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  55 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  56 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  57                               int write);
  58 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  59                                 pmd_t *pmd, int write);
  60 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  61                                 pud_t *pud, int write);
  62 int pmd_huge(pmd_t pmd);
  63 int pud_huge(pud_t pmd);
  64 void hugetlb_change_protection(struct vm_area_struct *vma,
  65                 unsigned long address, unsigned long end, pgprot_t newprot);
  66
  67 #else /* !CONFIG_HUGETLB_PAGE */
  68
  69 static inline int PageHuge(struct page *page)
  70 {
  71         return 0;
  72 }
  73
  74 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  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
 106 #define hugetlb_change_protection(vma, address, end, newprot)
 107
 108 #ifndef HPAGE_MASK
 109 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 110 #define HPAGE_SIZE      PAGE_SIZE
 111 #endif
 112
 113 #endif /* !CONFIG_HUGETLB_PAGE */
 114
 115 #define HUGETLB_ANON_FILE "anon_hugepage"
 116
 117 enum {
 118         /*
 119          * The file will be used as an shm file so shmfs accounting rules
 120          * apply
 121          */
 122         HUGETLB_SHMFS_INODE     = 1,
 123         /*
 124          * The file is being created on the internal vfs mount and shmfs
 125          * accounting rules do not apply
 126          */
 127         HUGETLB_ANONHUGE_INODE  = 2,
 128 };
 129
 130 #ifdef CONFIG_HUGETLBFS
 131 struct hugetlbfs_config {
 132         uid_t   uid;
 133         gid_t   gid;
 134         umode_t mode;
 135         long    nr_blocks;
 136         long    nr_inodes;
 137         struct hstate *hstate;
 138 };
 139
 140 struct hugetlbfs_sb_info {
 141         long    max_blocks;   /* blocks allowed */
 142         long    free_blocks;  /* blocks free */
 143         long    max_inodes;   /* inodes allowed */
 144         long    free_inodes;  /* inodes free */
 145         spinlock_t      stat_lock;
 146         struct hstate *hstate;
 147 };
 148
 149
 150 struct hugetlbfs_inode_info {
 151         struct shared_policy policy;
 152         struct inode vfs_inode;
 153 };
 154
 155 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 156 {
 157         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 158 }
 159
 160 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 161 {
 162         return sb->s_fs_info;
 163 }
 164
 165 extern const struct file_operations hugetlbfs_file_operations;
 166 extern struct vm_operations_struct hugetlb_vm_ops;
 167 struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
 168                                 struct user_struct **user, int creat_flags);
 169 int hugetlb_get_quota(struct address_space *mapping, long delta);
 170 void hugetlb_put_quota(struct address_space *mapping, long delta);
 171
 172 static inline int is_file_hugepages(struct file *file)
 173 {
 174         if (file->f_op == &hugetlbfs_file_operations)
 175                 return 1;
 176         if (is_file_shm_hugepages(file))
 177                 return 1;
 178
 179         return 0;
 180 }
 181
 182 static inline void set_file_hugepages(struct file *file)
 183 {
 184         file->f_op = &hugetlbfs_file_operations;
 185 }
 186 #else /* !CONFIG_HUGETLBFS */
 187
 188 #define is_file_hugepages(file)                 0
 189 #define set_file_hugepages(file)                BUG()
 190 static inline struct file *hugetlb_file_setup(const char *name, size_t size,
 191                 int acctflag, struct user_struct **user, int creat_flags)
 192 {
 193         return ERR_PTR(-ENOSYS);
 194 }
 195
 196 #endif /* !CONFIG_HUGETLBFS */
 197
 198 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 199 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 200                                         unsigned long len, unsigned long pgoff,
 201                                         unsigned long flags);
 202 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 203
 204 #ifdef CONFIG_HUGETLB_PAGE
 205
 206 #define HSTATE_NAME_LEN 32
 207 /* Defines one hugetlb page size */
 208 struct hstate {
 209         int next_nid_to_alloc;
 210         int next_nid_to_free;
 211         unsigned int order;
 212         unsigned long mask;
 213         unsigned long max_huge_pages;
 214         unsigned long nr_huge_pages;
 215         unsigned long free_huge_pages;
 216         unsigned long resv_huge_pages;
 217         unsigned long surplus_huge_pages;
 218         unsigned long nr_overcommit_huge_pages;
 219         struct list_head hugepage_freelists[MAX_NUMNODES];
 220         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 221         unsigned int free_huge_pages_node[MAX_NUMNODES];
 222         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 223         char name[HSTATE_NAME_LEN];
 224 };
 225
 226 struct huge_bootmem_page {
 227         struct list_head list;
 228         struct hstate *hstate;
 229 };
 230
 231 /* arch callback */
 232 int __init alloc_bootmem_huge_page(struct hstate *h);
 233
 234 void __init hugetlb_add_hstate(unsigned order);
 235 struct hstate *size_to_hstate(unsigned long size);
 236
 237 #ifndef HUGE_MAX_HSTATE
 238 #define HUGE_MAX_HSTATE 1
 239 #endif
 240
 241 extern struct hstate hstates[HUGE_MAX_HSTATE];
 242 extern unsigned int default_hstate_idx;
 243
 244 #define default_hstate (hstates[default_hstate_idx])
 245
 246 static inline struct hstate *hstate_inode(struct inode *i)
 247 {
 248         struct hugetlbfs_sb_info *hsb;
 249         hsb = HUGETLBFS_SB(i->i_sb);
 250         return hsb->hstate;
 251 }
 252
 253 static inline struct hstate *hstate_file(struct file *f)
 254 {
 255         return hstate_inode(f->f_dentry->d_inode);
 256 }
 257
 258 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 259 {
 260         return hstate_file(vma->vm_file);
 261 }
 262
 263 static inline unsigned long huge_page_size(struct hstate *h)
 264 {
 265         return (unsigned long)PAGE_SIZE << h->order;
 266 }
 267
 268 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 269
 270 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 271
 272 static inline unsigned long huge_page_mask(struct hstate *h)
 273 {
 274         return h->mask;
 275 }
 276
 277 static inline unsigned int huge_page_order(struct hstate *h)
 278 {
 279         return h->order;
 280 }
 281
 282 static inline unsigned huge_page_shift(struct hstate *h)
 283 {
 284         return h->order + PAGE_SHIFT;
 285 }
 286
 287 static inline unsigned int pages_per_huge_page(struct hstate *h)
 288 {
 289         return 1 << h->order;
 290 }
 291
 292 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 293 {
 294         return huge_page_size(h) / 512;
 295 }
 296
 297 #include <asm/hugetlb.h>
 298
 299 static inline struct hstate *page_hstate(struct page *page)
 300 {
 301         return size_to_hstate(PAGE_SIZE << compound_order(page));
 302 }
 303
 304 #else
 305 struct hstate {};
 306 #define alloc_bootmem_huge_page(h) NULL
 307 #define hstate_file(f) NULL
 308 #define hstate_vma(v) NULL
 309 #define hstate_inode(i) NULL
 310 #define huge_page_size(h) PAGE_SIZE
 311 #define huge_page_mask(h) PAGE_MASK
 312 #define vma_kernel_pagesize(v) PAGE_SIZE
 313 #define vma_mmu_pagesize(v) PAGE_SIZE
 314 #define huge_page_order(h) 0
 315 #define huge_page_shift(h) PAGE_SHIFT
 316 static inline unsigned int pages_per_huge_page(struct hstate *h)
 317 {
 318         return 1;
 319 }
 320 #endif
 321
 322 #endif /* _LINUX_HUGETLB_H */