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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 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  21 int hugetlb_report_meminfo(char *);
  22 int hugetlb_report_node_meminfo(int, char *);
  23 unsigned long hugetlb_total_pages(void);
  24 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  25                         unsigned long address, int write_access);
  26
  27 extern unsigned long max_huge_pages;
  28 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  29 extern int sysctl_hugetlb_shm_group;
  30
  31 /* arch callbacks */
  32
  33 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  34 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  35 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  36                               int write);
  37 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  38                                 pmd_t *pmd, int write);
  39 int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
  40 int pmd_huge(pmd_t pmd);
  41 void hugetlb_change_protection(struct vm_area_struct *vma,
  42                 unsigned long address, unsigned long end, pgprot_t newprot);
  43
  44 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  45 #define is_hugepage_only_range(mm, addr, len)   0
  46 #endif
  47
  48 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
  49 #define hugetlb_free_pgd_range  free_pgd_range
  50 #else
  51 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
  52                             unsigned long end, unsigned long floor,
  53                             unsigned long ceiling);
  54 #endif
  55
  56 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  57 #define prepare_hugepage_range(addr, len)       \
  58         is_aligned_hugepage_range(addr, len)
  59 #else
  60 int prepare_hugepage_range(unsigned long addr, unsigned long len);
  61 #endif
  62
  63 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  64 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  65 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  66 #else
  67 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  68                      pte_t *ptep, pte_t pte);
  69 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  70                               pte_t *ptep);
  71 #endif
  72
  73 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  74 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  75 #else
  76 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  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 unmap_hugepage_range(vma, start, end)   BUG()
  95 #define hugetlb_report_meminfo(buf)             0
  96 #define hugetlb_report_node_meminfo(n, buf)     0
  97 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  98 #define is_aligned_hugepage_range(addr, len)    0
  99 #define prepare_hugepage_range(addr, len)       (-EINVAL)
 100 #define pmd_huge(x)     0
 101 #define is_hugepage_only_range(mm, addr, len)   0
 102 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 103 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 104
 105 #define hugetlb_change_protection(vma, address, end, newprot)
 106
 107 #ifndef HPAGE_MASK
 108 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 109 #define HPAGE_SIZE      PAGE_SIZE
 110 #endif
 111
 112 #endif /* !CONFIG_HUGETLB_PAGE */
 113
 114 #ifdef CONFIG_HUGETLBFS
 115 struct hugetlbfs_config {
 116         uid_t   uid;
 117         gid_t   gid;
 118         umode_t mode;
 119         long    nr_blocks;
 120         long    nr_inodes;
 121 };
 122
 123 struct hugetlbfs_sb_info {
 124         long    max_blocks;   /* blocks allowed */
 125         long    free_blocks;  /* blocks free */
 126         long    max_inodes;   /* inodes allowed */
 127         long    free_inodes;  /* inodes free */
 128         spinlock_t      stat_lock;
 129 };
 130
 131
 132 struct hugetlbfs_inode_info {
 133         struct shared_policy policy;
 134         /* Protected by the (global) hugetlb_lock */
 135         unsigned long prereserved_hpages;
 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_extend_reservation(struct hugetlbfs_inode_info *info,
 153                                unsigned long atleast_hpages);
 154 void hugetlb_truncate_reservation(struct hugetlbfs_inode_info *info,
 155                                   unsigned long atmost_hpages);
 156 int hugetlb_get_quota(struct address_space *mapping);
 157 void hugetlb_put_quota(struct address_space *mapping);
 158
 159 static inline int is_file_hugepages(struct file *file)
 160 {
 161         return file->f_op == &hugetlbfs_file_operations;
 162 }
 163
 164 static inline void set_file_hugepages(struct file *file)
 165 {
 166         file->f_op = &hugetlbfs_file_operations;
 167 }
 168 #else /* !CONFIG_HUGETLBFS */
 169
 170 #define is_file_hugepages(file)         0
 171 #define set_file_hugepages(file)        BUG()
 172 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
 173
 174 #endif /* !CONFIG_HUGETLBFS */
 175
 176 #endif /* _LINUX_HUGETLB_H */