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   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 unmap_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 unsigned long hugetlb_total_pages(void);
  25 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  26                         unsigned long address, int write_access);
  27 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
  28 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  29
  30 extern unsigned long max_huge_pages;
  31 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  32 extern int sysctl_hugetlb_shm_group;
  33
  34 /* arch callbacks */
  35
  36 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  37 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  38 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  39                               int write);
  40 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  41                                 pmd_t *pmd, int write);
  42 int pmd_huge(pmd_t pmd);
  43 void hugetlb_change_protection(struct vm_area_struct *vma,
  44                 unsigned long address, unsigned long end, pgprot_t newprot);
  45
  46 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  47 #define is_hugepage_only_range(mm, addr, len)   0
  48 #endif
  49
  50 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
  51 #define hugetlb_free_pgd_range  free_pgd_range
  52 #else
  53 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
  54                             unsigned long end, unsigned long floor,
  55                             unsigned long ceiling);
  56 #endif
  57
  58 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  59 /*
  60  * If the arch doesn't supply something else, assume that hugepage
  61  * size aligned regions are ok without further preparation.
  62  */
  63 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
  64                                                 pgoff_t pgoff)
  65 {
  66         if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
  67                 return -EINVAL;
  68         if (len & ~HPAGE_MASK)
  69                 return -EINVAL;
  70         if (addr & ~HPAGE_MASK)
  71                 return -EINVAL;
  72         return 0;
  73 }
  74 #else
  75 int prepare_hugepage_range(unsigned long addr, unsigned long len,
  76                                                 pgoff_t pgoff);
  77 #endif
  78
  79 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  80 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  81 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  82 #else
  83 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  84                      pte_t *ptep, pte_t pte);
  85 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  86                               pte_t *ptep);
  87 #endif
  88
  89 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  90 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  91 #else
  92 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  93 #endif
  94
  95 #else /* !CONFIG_HUGETLB_PAGE */
  96
  97 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  98 {
  99         return 0;
 100 }
 101 static inline unsigned long hugetlb_total_pages(void)
 102 {
 103         return 0;
 104 }
 105
 106 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
 107 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 108 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 109 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
 110 #define unmap_hugepage_range(vma, start, end)   BUG()
 111 #define hugetlb_report_meminfo(buf)             0
 112 #define hugetlb_report_node_meminfo(n, buf)     0
 113 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
 114 #define prepare_hugepage_range(addr,len,pgoff)  (-EINVAL)
 115 #define pmd_huge(x)     0
 116 #define is_hugepage_only_range(mm, addr, len)   0
 117 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 118 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 119
 120 #define hugetlb_change_protection(vma, address, end, newprot)
 121
 122 #ifndef HPAGE_MASK
 123 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 124 #define HPAGE_SIZE      PAGE_SIZE
 125 #endif
 126
 127 #endif /* !CONFIG_HUGETLB_PAGE */
 128
 129 #ifdef CONFIG_HUGETLBFS
 130 struct hugetlbfs_config {
 131         uid_t   uid;
 132         gid_t   gid;
 133         umode_t mode;
 134         long    nr_blocks;
 135         long    nr_inodes;
 136 };
 137
 138 struct hugetlbfs_sb_info {
 139         long    max_blocks;   /* blocks allowed */
 140         long    free_blocks;  /* blocks free */
 141         long    max_inodes;   /* inodes allowed */
 142         long    free_inodes;  /* inodes free */
 143         spinlock_t      stat_lock;
 144 };
 145
 146
 147 struct hugetlbfs_inode_info {
 148         struct shared_policy policy;
 149         struct inode vfs_inode;
 150 };
 151
 152 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 153 {
 154         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 155 }
 156
 157 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 158 {
 159         return sb->s_fs_info;
 160 }
 161
 162 extern const struct file_operations hugetlbfs_file_operations;
 163 extern struct vm_operations_struct hugetlb_vm_ops;
 164 struct file *hugetlb_zero_setup(size_t);
 165 int hugetlb_get_quota(struct address_space *mapping);
 166 void hugetlb_put_quota(struct address_space *mapping);
 167
 168 static inline int is_file_hugepages(struct file *file)
 169 {
 170         return file->f_op == &hugetlbfs_file_operations;
 171 }
 172
 173 static inline void set_file_hugepages(struct file *file)
 174 {
 175         file->f_op = &hugetlbfs_file_operations;
 176 }
 177 #else /* !CONFIG_HUGETLBFS */
 178
 179 #define is_file_hugepages(file)         0
 180 #define set_file_hugepages(file)        BUG()
 181 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
 182
 183 #endif /* !CONFIG_HUGETLBFS */
 184
 185 #endif /* _LINUX_HUGETLB_H */