include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #include <linux/fs.h>
   5
   6 #ifdef CONFIG_HUGETLB_PAGE
   7
   8 #include <linux/mempolicy.h>
   9 #include <linux/shm.h>
  10 #include <asm/tlbflush.h>
  11
  12 struct ctl_table;
  13
  14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  15 {
  16         return vma->vm_flags & VM_HUGETLB;
  17 }
  18
  19 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  20 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  21 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  22 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
  23 void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  24 void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
  25 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  26 int hugetlb_report_meminfo(char *);
  27 int hugetlb_report_node_meminfo(int, char *);
  28 unsigned long hugetlb_total_pages(void);
  29 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  30                         unsigned long address, int write_access);
  31 int hugetlb_reserve_pages(struct inode *inode, long from, long to);
  32 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  33
  34 extern unsigned long max_huge_pages;
  35 extern unsigned long hugepages_treat_as_movable;
  36 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  37 extern int sysctl_hugetlb_shm_group;
  38
  39 /* arch callbacks */
  40
  41 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  42 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  43 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  44 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  45                               int write);
  46 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  47                                 pmd_t *pmd, int write);
  48 int pmd_huge(pmd_t pmd);
  49 void hugetlb_change_protection(struct vm_area_struct *vma,
  50                 unsigned long address, unsigned long end, pgprot_t newprot);
  51
  52 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  53 #define is_hugepage_only_range(mm, addr, len)   0
  54 #endif
  55
  56 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
  57 #define hugetlb_free_pgd_range  free_pgd_range
  58 #else
  59 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
  60                             unsigned long end, unsigned long floor,
  61                             unsigned long ceiling);
  62 #endif
  63
  64 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  65 /*
  66  * If the arch doesn't supply something else, assume that hugepage
  67  * size aligned regions are ok without further preparation.
  68  */
  69 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len,
  70                                                 pgoff_t pgoff)
  71 {
  72         if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
  73                 return -EINVAL;
  74         if (len & ~HPAGE_MASK)
  75                 return -EINVAL;
  76         if (addr & ~HPAGE_MASK)
  77                 return -EINVAL;
  78         return 0;
  79 }
  80 #else
  81 int prepare_hugepage_range(unsigned long addr, unsigned long len,
  82                                                 pgoff_t pgoff);
  83 #endif
  84
  85 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  86 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  87 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  88 #else
  89 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  90                      pte_t *ptep, pte_t pte);
  91 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  92                               pte_t *ptep);
  93 #endif
  94
  95 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  96 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  97 #else
  98 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  99 #endif
 100
 101 #else /* !CONFIG_HUGETLB_PAGE */
 102
 103 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
 104 {
 105         return 0;
 106 }
 107 static inline unsigned long hugetlb_total_pages(void)
 108 {
 109         return 0;
 110 }
 111
 112 #define follow_hugetlb_page(m,v,p,vs,a,b,i)     ({ BUG(); 0; })
 113 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 114 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 115 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
 116 #define unmap_hugepage_range(vma, start, end)   BUG()
 117 #define hugetlb_report_meminfo(buf)             0
 118 #define hugetlb_report_node_meminfo(n, buf)     0
 119 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
 120 #define prepare_hugepage_range(addr,len,pgoff)  (-EINVAL)
 121 #define pmd_huge(x)     0
 122 #define is_hugepage_only_range(mm, addr, len)   0
 123 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 124 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 125
 126 #define hugetlb_change_protection(vma, address, end, newprot)
 127
 128 #ifndef HPAGE_MASK
 129 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 130 #define HPAGE_SIZE      PAGE_SIZE
 131 #endif
 132
 133 #endif /* !CONFIG_HUGETLB_PAGE */
 134
 135 #ifdef CONFIG_HUGETLBFS
 136 struct hugetlbfs_config {
 137         uid_t   uid;
 138         gid_t   gid;
 139         umode_t mode;
 140         long    nr_blocks;
 141         long    nr_inodes;
 142 };
 143
 144 struct hugetlbfs_sb_info {
 145         long    max_blocks;   /* blocks allowed */
 146         long    free_blocks;  /* blocks free */
 147         long    max_inodes;   /* inodes allowed */
 148         long    free_inodes;  /* inodes free */
 149         spinlock_t      stat_lock;
 150 };
 151
 152
 153 struct hugetlbfs_inode_info {
 154         struct shared_policy policy;
 155         struct inode vfs_inode;
 156 };
 157
 158 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 159 {
 160         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 161 }
 162
 163 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 164 {
 165         return sb->s_fs_info;
 166 }
 167
 168 extern const struct file_operations hugetlbfs_file_operations;
 169 extern struct vm_operations_struct hugetlb_vm_ops;
 170 struct file *hugetlb_file_setup(const char *name, size_t);
 171 int hugetlb_get_quota(struct address_space *mapping);
 172 void hugetlb_put_quota(struct address_space *mapping);
 173
 174 static inline int is_file_hugepages(struct file *file)
 175 {
 176         if (file->f_op == &hugetlbfs_file_operations)
 177                 return 1;
 178         if (is_file_shm_hugepages(file))
 179                 return 1;
 180
 181         return 0;
 182 }
 183
 184 static inline void set_file_hugepages(struct file *file)
 185 {
 186         file->f_op = &hugetlbfs_file_operations;
 187 }
 188 #else /* !CONFIG_HUGETLBFS */
 189
 190 #define is_file_hugepages(file)         0
 191 #define set_file_hugepages(file)        BUG()
 192 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
 193
 194 #endif /* !CONFIG_HUGETLBFS */
 195
 196 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 197 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 198                                         unsigned long len, unsigned long pgoff,
 199                                         unsigned long flags);
 200 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 201
 202 #endif /* _LINUX_HUGETLB_H */