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 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 int is_hugepage_mem_enough(size_t);
  24 unsigned long hugetlb_total_pages(void);
  25 struct page *alloc_huge_page(struct vm_area_struct *, unsigned long);
  26 void free_huge_page(struct page *);
  27 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  28                         unsigned long address, int write_access);
  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 is_aligned_hugepage_range(unsigned long addr, unsigned long len);
  43 int pmd_huge(pmd_t pmd);
  44
  45 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  46 #define is_hugepage_only_range(mm, addr, len)   0
  47 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
  48                                                 do { } while (0)
  49 #endif
  50
  51 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  52 #define prepare_hugepage_range(addr, len)       \
  53         is_aligned_hugepage_range(addr, len)
  54 #else
  55 int prepare_hugepage_range(unsigned long addr, unsigned long len);
  56 #endif
  57
  58 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  59 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  60 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  61 #else
  62 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  63                      pte_t *ptep, pte_t pte);
  64 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  65                               pte_t *ptep);
  66 #endif
  67
  68 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  69 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  70 #else
  71 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  72 #endif
  73
  74 #else /* !CONFIG_HUGETLB_PAGE */
  75
  76 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  77 {
  78         return 0;
  79 }
  80 static inline unsigned long hugetlb_total_pages(void)
  81 {
  82         return 0;
  83 }
  84
  85 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
  86 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  87 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  88 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  89 #define unmap_hugepage_range(vma, start, end)   BUG()
  90 #define is_hugepage_mem_enough(size)            0
  91 #define hugetlb_report_meminfo(buf)             0
  92 #define hugetlb_report_node_meminfo(n, buf)     0
  93 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  94 #define is_aligned_hugepage_range(addr, len)    0
  95 #define prepare_hugepage_range(addr, len)       (-EINVAL)
  96 #define pmd_huge(x)     0
  97 #define is_hugepage_only_range(mm, addr, len)   0
  98 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
  99                                                 do { } while (0)
 100 #define alloc_huge_page(vma, addr)              ({ NULL; })
 101 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
 102 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 103
 104 #ifndef HPAGE_MASK
 105 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 106 #define HPAGE_SIZE      PAGE_SIZE
 107 #endif
 108
 109 #endif /* !CONFIG_HUGETLB_PAGE */
 110
 111 #ifdef CONFIG_HUGETLBFS
 112 struct hugetlbfs_config {
 113         uid_t   uid;
 114         gid_t   gid;
 115         umode_t mode;
 116         long    nr_blocks;
 117         long    nr_inodes;
 118 };
 119
 120 struct hugetlbfs_sb_info {
 121         long    max_blocks;   /* blocks allowed */
 122         long    free_blocks;  /* blocks free */
 123         long    max_inodes;   /* inodes allowed */
 124         long    free_inodes;  /* inodes free */
 125         spinlock_t      stat_lock;
 126 };
 127
 128
 129 struct hugetlbfs_inode_info {
 130         struct shared_policy policy;
 131         struct inode vfs_inode;
 132 };
 133
 134 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 135 {
 136         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 137 }
 138
 139 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 140 {
 141         return sb->s_fs_info;
 142 }
 143
 144 extern struct file_operations hugetlbfs_file_operations;
 145 extern struct vm_operations_struct hugetlb_vm_ops;
 146 struct file *hugetlb_zero_setup(size_t);
 147 int hugetlb_get_quota(struct address_space *mapping);
 148 void hugetlb_put_quota(struct address_space *mapping);
 149
 150 static inline int is_file_hugepages(struct file *file)
 151 {
 152         return file->f_op == &hugetlbfs_file_operations;
 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_zero_setup(size)        ERR_PTR(-ENOSYS)
 164
 165 #endif /* !CONFIG_HUGETLBFS */
 166
 167 #endif /* _LINUX_HUGETLB_H */