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