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 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 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
  50                                                 do { } while (0)
  51 #endif
  52
  53 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  54 #define prepare_hugepage_range(addr, len)       \
  55         is_aligned_hugepage_range(addr, len)
  56 #else
  57 int prepare_hugepage_range(unsigned long addr, unsigned long len);
  58 #endif
  59
  60 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  61 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  62 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  63 #else
  64 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  65                      pte_t *ptep, pte_t pte);
  66 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  67                               pte_t *ptep);
  68 #endif
  69
  70 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  71 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  72 #else
  73 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  74 #endif
  75
  76 #else /* !CONFIG_HUGETLB_PAGE */
  77
  78 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  79 {
  80         return 0;
  81 }
  82 static inline unsigned long hugetlb_total_pages(void)
  83 {
  84         return 0;
  85 }
  86
  87 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
  88 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  89 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  90 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  91 #define unmap_hugepage_range(vma, start, end)   BUG()
  92 #define is_hugepage_mem_enough(size)            0
  93 #define hugetlb_report_meminfo(buf)             0
  94 #define hugetlb_report_node_meminfo(n, buf)     0
  95 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  96 #define is_aligned_hugepage_range(addr, len)    0
  97 #define prepare_hugepage_range(addr, len)       (-EINVAL)
  98 #define pmd_huge(x)     0
  99 #define is_hugepage_only_range(mm, addr, len)   0
 100 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
 101                                                 do { } while (0)
 102 #define alloc_huge_page(vma, addr)              ({ NULL; })
 103 #define free_huge_page(p)                       ({ (void)(p); BUG(); })
 104 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 105
 106 #define hugetlb_change_protection(vma, address, end, newprot)
 107
 108 #ifndef HPAGE_MASK
 109 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 110 #define HPAGE_SIZE      PAGE_SIZE
 111 #endif
 112
 113 #endif /* !CONFIG_HUGETLB_PAGE */
 114
 115 #ifdef CONFIG_HUGETLBFS
 116 struct hugetlbfs_config {
 117         uid_t   uid;
 118         gid_t   gid;
 119         umode_t mode;
 120         long    nr_blocks;
 121         long    nr_inodes;
 122 };
 123
 124 struct hugetlbfs_sb_info {
 125         long    max_blocks;   /* blocks allowed */
 126         long    free_blocks;  /* blocks free */
 127         long    max_inodes;   /* inodes allowed */
 128         long    free_inodes;  /* inodes free */
 129         spinlock_t      stat_lock;
 130 };
 131
 132
 133 struct hugetlbfs_inode_info {
 134         struct shared_policy policy;
 135         struct inode vfs_inode;
 136 };
 137
 138 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 139 {
 140         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 141 }
 142
 143 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 144 {
 145         return sb->s_fs_info;
 146 }
 147
 148 extern struct file_operations hugetlbfs_file_operations;
 149 extern struct vm_operations_struct hugetlb_vm_ops;
 150 struct file *hugetlb_zero_setup(size_t);
 151 int hugetlb_get_quota(struct address_space *mapping);
 152 void hugetlb_put_quota(struct address_space *mapping);
 153
 154 static inline int is_file_hugepages(struct file *file)
 155 {
 156         return file->f_op == &hugetlbfs_file_operations;
 157 }
 158
 159 static inline void set_file_hugepages(struct file *file)
 160 {
 161         file->f_op = &hugetlbfs_file_operations;
 162 }
 163 #else /* !CONFIG_HUGETLBFS */
 164
 165 #define is_file_hugepages(file)         0
 166 #define set_file_hugepages(file)        BUG()
 167 #define hugetlb_zero_setup(size)        ERR_PTR(-ENOSYS)
 168
 169 #endif /* !CONFIG_HUGETLBFS */
 170
 171 #endif /* _LINUX_HUGETLB_H */