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