include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #include <linux/fs.h>
   5
   6 #ifdef CONFIG_HUGETLB_PAGE
   7
   8 #include <linux/mempolicy.h>
   9 #include <linux/shm.h>
  10 #include <asm/tlbflush.h>
  11
  12 struct ctl_table;
  13
  14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  15 {
  16         return vma->vm_flags & VM_HUGETLB;
  17 }
  18
  19 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  20 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  21 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  22 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  23 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  24 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
  25 void unmap_hugepage_range(struct vm_area_struct *,
  26                         unsigned long, unsigned long, struct page *);
  27 void __unmap_hugepage_range(struct vm_area_struct *,
  28                         unsigned long, unsigned long, struct page *);
  29 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  30 void hugetlb_report_meminfo(struct seq_file *);
  31 int hugetlb_report_node_meminfo(int, char *);
  32 unsigned long hugetlb_total_pages(void);
  33 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  34                         unsigned long address, int write_access);
  35 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  36                                                 struct vm_area_struct *vma);
  37 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  38
  39 extern unsigned long hugepages_treat_as_movable;
  40 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  41 extern int sysctl_hugetlb_shm_group;
  42 extern struct list_head huge_boot_pages;
  43
  44 /* arch callbacks */
  45
  46 pte_t *huge_pte_alloc(struct mm_struct *mm,
  47                         unsigned long addr, unsigned long sz);
  48 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  49 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  50 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  51                               int write);
  52 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  53                                 pmd_t *pmd, int write);
  54 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  55                                 pud_t *pud, int write);
  56 int pmd_huge(pmd_t pmd);
  57 int pud_huge(pud_t pmd);
  58 void hugetlb_change_protection(struct vm_area_struct *vma,
  59                 unsigned long address, unsigned long end, pgprot_t newprot);
  60
  61 #else /* !CONFIG_HUGETLB_PAGE */
  62
  63 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  64 {
  65         return 0;
  66 }
  67
  68 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  69 {
  70 }
  71
  72 static inline unsigned long hugetlb_total_pages(void)
  73 {
  74         return 0;
  75 }
  76
  77 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  78 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  79 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  80 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  81 #define unmap_hugepage_range(vma, start, end, page)     BUG()
  82 static inline void hugetlb_report_meminfo(struct seq_file *m)
  83 {
  84 }
  85 #define hugetlb_report_node_meminfo(n, buf)     0
  86 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  87 #define follow_huge_pud(mm, addr, pud, write)   NULL
  88 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
  89 #define pmd_huge(x)     0
  90 #define pud_huge(x)     0
  91 #define is_hugepage_only_range(mm, addr, len)   0
  92 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
  93 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
  94
  95 #define hugetlb_change_protection(vma, address, end, newprot)
  96
  97 #ifndef HPAGE_MASK
  98 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
  99 #define HPAGE_SIZE      PAGE_SIZE
 100 #endif
 101
 102 #endif /* !CONFIG_HUGETLB_PAGE */
 103
 104 #ifdef CONFIG_HUGETLBFS
 105 struct hugetlbfs_config {
 106         uid_t   uid;
 107         gid_t   gid;
 108         umode_t mode;
 109         long    nr_blocks;
 110         long    nr_inodes;
 111         struct hstate *hstate;
 112 };
 113
 114 struct hugetlbfs_sb_info {
 115         long    max_blocks;   /* blocks allowed */
 116         long    free_blocks;  /* blocks free */
 117         long    max_inodes;   /* inodes allowed */
 118         long    free_inodes;  /* inodes free */
 119         spinlock_t      stat_lock;
 120         struct hstate *hstate;
 121 };
 122
 123
 124 struct hugetlbfs_inode_info {
 125         struct shared_policy policy;
 126         struct inode vfs_inode;
 127 };
 128
 129 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 130 {
 131         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 132 }
 133
 134 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 135 {
 136         return sb->s_fs_info;
 137 }
 138
 139 extern const struct file_operations hugetlbfs_file_operations;
 140 extern struct vm_operations_struct hugetlb_vm_ops;
 141 struct file *hugetlb_file_setup(const char *name, size_t);
 142 int hugetlb_get_quota(struct address_space *mapping, long delta);
 143 void hugetlb_put_quota(struct address_space *mapping, long delta);
 144
 145 static inline int is_file_hugepages(struct file *file)
 146 {
 147         if (file->f_op == &hugetlbfs_file_operations)
 148                 return 1;
 149         if (is_file_shm_hugepages(file))
 150                 return 1;
 151
 152         return 0;
 153 }
 154
 155 static inline void set_file_hugepages(struct file *file)
 156 {
 157         file->f_op = &hugetlbfs_file_operations;
 158 }
 159 #else /* !CONFIG_HUGETLBFS */
 160
 161 #define is_file_hugepages(file)         0
 162 #define set_file_hugepages(file)        BUG()
 163 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
 164
 165 #endif /* !CONFIG_HUGETLBFS */
 166
 167 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 168 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 169                                         unsigned long len, unsigned long pgoff,
 170                                         unsigned long flags);
 171 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 172
 173 #ifdef CONFIG_HUGETLB_PAGE
 174
 175 #define HSTATE_NAME_LEN 32
 176 /* Defines one hugetlb page size */
 177 struct hstate {
 178         int hugetlb_next_nid;
 179         unsigned int order;
 180         unsigned long mask;
 181         unsigned long max_huge_pages;
 182         unsigned long nr_huge_pages;
 183         unsigned long free_huge_pages;
 184         unsigned long resv_huge_pages;
 185         unsigned long surplus_huge_pages;
 186         unsigned long nr_overcommit_huge_pages;
 187         struct list_head hugepage_freelists[MAX_NUMNODES];
 188         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 189         unsigned int free_huge_pages_node[MAX_NUMNODES];
 190         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 191         char name[HSTATE_NAME_LEN];
 192 };
 193
 194 struct huge_bootmem_page {
 195         struct list_head list;
 196         struct hstate *hstate;
 197 };
 198
 199 /* arch callback */
 200 int __init alloc_bootmem_huge_page(struct hstate *h);
 201
 202 void __init hugetlb_add_hstate(unsigned order);
 203 struct hstate *size_to_hstate(unsigned long size);
 204
 205 #ifndef HUGE_MAX_HSTATE
 206 #define HUGE_MAX_HSTATE 1
 207 #endif
 208
 209 extern struct hstate hstates[HUGE_MAX_HSTATE];
 210 extern unsigned int default_hstate_idx;
 211
 212 #define default_hstate (hstates[default_hstate_idx])
 213
 214 static inline struct hstate *hstate_inode(struct inode *i)
 215 {
 216         struct hugetlbfs_sb_info *hsb;
 217         hsb = HUGETLBFS_SB(i->i_sb);
 218         return hsb->hstate;
 219 }
 220
 221 static inline struct hstate *hstate_file(struct file *f)
 222 {
 223         return hstate_inode(f->f_dentry->d_inode);
 224 }
 225
 226 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 227 {
 228         return hstate_file(vma->vm_file);
 229 }
 230
 231 static inline unsigned long huge_page_size(struct hstate *h)
 232 {
 233         return (unsigned long)PAGE_SIZE << h->order;
 234 }
 235
 236 static inline unsigned long huge_page_mask(struct hstate *h)
 237 {
 238         return h->mask;
 239 }
 240
 241 static inline unsigned int huge_page_order(struct hstate *h)
 242 {
 243         return h->order;
 244 }
 245
 246 static inline unsigned huge_page_shift(struct hstate *h)
 247 {
 248         return h->order + PAGE_SHIFT;
 249 }
 250
 251 static inline unsigned int pages_per_huge_page(struct hstate *h)
 252 {
 253         return 1 << h->order;
 254 }
 255
 256 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 257 {
 258         return huge_page_size(h) / 512;
 259 }
 260
 261 #include <asm/hugetlb.h>
 262
 263 static inline struct hstate *page_hstate(struct page *page)
 264 {
 265         return size_to_hstate(PAGE_SIZE << compound_order(page));
 266 }
 267
 268 #else
 269 struct hstate {};
 270 #define alloc_bootmem_huge_page(h) NULL
 271 #define hstate_file(f) NULL
 272 #define hstate_vma(v) NULL
 273 #define hstate_inode(i) NULL
 274 #define huge_page_size(h) PAGE_SIZE
 275 #define huge_page_mask(h) PAGE_MASK
 276 #define huge_page_order(h) 0
 277 #define huge_page_shift(h) PAGE_SHIFT
 278 static inline unsigned int pages_per_huge_page(struct hstate *h)
 279 {
 280         return 1;
 281 }
 282 #endif
 283
 284 #endif /* _LINUX_HUGETLB_H */