include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #ifdef CONFIG_HUGETLB_PAGE
   5
   6 #include <linux/mempolicy.h>
   7 #include <asm/tlbflush.h>
   8
   9 struct ctl_table;
  10
  11 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  12 {
  13         return vma->vm_flags & VM_HUGETLB;
  14 }
  15
  16 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  17 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  18 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
  19 void zap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  20 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  21 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  22 int hugetlb_report_meminfo(char *);
  23 int hugetlb_report_node_meminfo(int, char *);
  24 int is_hugepage_mem_enough(size_t);
  25 unsigned long hugetlb_total_pages(void);
  26 struct page *alloc_huge_page(void);
  27 void free_huge_page(struct page *);
  28
  29 extern unsigned long max_huge_pages;
  30 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  31 extern int sysctl_hugetlb_shm_group;
  32
  33 /* arch callbacks */
  34
  35 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  36 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  37 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  38                               int write);
  39 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  40                                 pmd_t *pmd, int write);
  41 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
  42 int pmd_huge(pmd_t pmd);
  43
  44 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  45 #define is_hugepage_only_range(mm, addr, len)   0
  46 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
  47                                                 do { } while (0)
  48 #endif
  49
  50 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  51 #define prepare_hugepage_range(addr, len)       \
  52         is_aligned_hugepage_range(addr, len)
  53 #else
  54 int prepare_hugepage_range(unsigned long addr, unsigned long len);
  55 #endif
  56
  57 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  58 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  59 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  60 #else
  61 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  62                      pte_t *ptep, pte_t pte);
  63 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  64                               pte_t *ptep);
  65 #endif
  66
  67 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  68 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  69 #else
  70 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  71 #endif
  72
  73 #ifndef ARCH_HAS_HUGETLB_CLEAN_STALE_PGTABLE
  74 #define hugetlb_clean_stale_pgtable(pte)        BUG()
  75 #else
  76 void hugetlb_clean_stale_pgtable(pte_t *pte);
  77 #endif
  78
  79 #else /* !CONFIG_HUGETLB_PAGE */
  80
  81 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  82 {
  83         return 0;
  84 }
  85 static inline unsigned long hugetlb_total_pages(void)
  86 {
  87         return 0;
  88 }
  89
  90 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
  91 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  92 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  93 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  94 #define zap_hugepage_range(vma, start, len)     BUG()
  95 #define unmap_hugepage_range(vma, start, end)   BUG()
  96 #define is_hugepage_mem_enough(size)            0
  97 #define hugetlb_report_meminfo(buf)             0
  98 #define hugetlb_report_node_meminfo(n, buf)     0
  99 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
 100 #define is_aligned_hugepage_range(addr, len)    0
 101 #define prepare_hugepage_range(addr, len)       (-EINVAL)
 102 #define pmd_huge(x)     0
 103 #define is_hugepage_only_range(mm, addr, len)   0
 104 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
 105                                                 do { } while (0)
 106 #define alloc_huge_page()                       ({ NULL; })
 107 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
 108
 109 #ifndef HPAGE_MASK
 110 #define HPAGE_MASK      0               /* Keep the compiler happy */
 111 #define HPAGE_SIZE      0
 112 #endif
 113
 114 #endif /* !CONFIG_HUGETLB_PAGE */
 115
 116 #ifdef CONFIG_HUGETLBFS
 117 struct hugetlbfs_config {
 118         uid_t   uid;
 119         gid_t   gid;
 120         umode_t mode;
 121         long    nr_blocks;
 122         long    nr_inodes;
 123 };
 124
 125 struct hugetlbfs_sb_info {
 126         long    max_blocks;   /* blocks allowed */
 127         long    free_blocks;  /* blocks free */
 128         long    max_inodes;   /* inodes allowed */
 129         long    free_inodes;  /* inodes free */
 130         spinlock_t      stat_lock;
 131 };
 132
 133
 134 struct hugetlbfs_inode_info {
 135         struct shared_policy policy;
 136         struct inode vfs_inode;
 137 };
 138
 139 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 140 {
 141         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 142 }
 143
 144 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 145 {
 146         return sb->s_fs_info;
 147 }
 148
 149 extern struct file_operations hugetlbfs_file_operations;
 150 extern struct vm_operations_struct hugetlb_vm_ops;
 151 struct file *hugetlb_zero_setup(size_t);
 152 int hugetlb_get_quota(struct address_space *mapping);
 153 void hugetlb_put_quota(struct address_space *mapping);
 154
 155 static inline int is_file_hugepages(struct file *file)
 156 {
 157         return file->f_op == &hugetlbfs_file_operations;
 158 }
 159
 160 static inline void set_file_hugepages(struct file *file)
 161 {
 162         file->f_op = &hugetlbfs_file_operations;
 163 }
 164 #else /* !CONFIG_HUGETLBFS */
 165
 166 #define is_file_hugepages(file)         0
 167 #define set_file_hugepages(file)        BUG()
 168 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
 169
 170 #endif /* !CONFIG_HUGETLBFS */
 171
 172 #endif /* _LINUX_HUGETLB_H */