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, 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 unsigned long nr_overcommit_huge_pages;
  37 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  38 extern int sysctl_hugetlb_shm_group;
  39
  40 /* arch callbacks */
  41
  42 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr);
  43 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  44 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  45 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  46                               int write);
  47 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  48                                 pmd_t *pmd, int write);
  49 int pmd_huge(pmd_t pmd);
  50 void hugetlb_change_protection(struct vm_area_struct *vma,
  51                 unsigned long address, unsigned long end, pgprot_t newprot);
  52
  53 #ifndef ARCH_HAS_HUGEPAGE_ONLY_RANGE
  54 #define is_hugepage_only_range(mm, addr, len)   0
  55 #endif
  56
  57 #ifndef ARCH_HAS_HUGETLB_FREE_PGD_RANGE
  58 #define hugetlb_free_pgd_range  free_pgd_range
  59 #else
  60 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
  61                             unsigned long end, unsigned long floor,
  62                             unsigned long ceiling);
  63 #endif
  64
  65 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
  66 /*
  67  * If the arch doesn't supply something else, assume that hugepage
  68  * size aligned regions are ok without further preparation.
  69  */
  70 static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
  71 {
  72         if (len & ~HPAGE_MASK)
  73                 return -EINVAL;
  74         if (addr & ~HPAGE_MASK)
  75                 return -EINVAL;
  76         return 0;
  77 }
  78 #else
  79 int prepare_hugepage_range(unsigned long addr, unsigned long len);
  80 #endif
  81
  82 #ifndef ARCH_HAS_SETCLEAR_HUGE_PTE
  83 #define set_huge_pte_at(mm, addr, ptep, pte)    set_pte_at(mm, addr, ptep, pte)
  84 #define huge_ptep_get_and_clear(mm, addr, ptep) ptep_get_and_clear(mm, addr, ptep)
  85 #else
  86 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
  87                      pte_t *ptep, pte_t pte);
  88 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
  89                               pte_t *ptep);
  90 #endif
  91
  92 #ifndef ARCH_HAS_HUGETLB_PREFAULT_HOOK
  93 #define hugetlb_prefault_arch_hook(mm)          do { } while (0)
  94 #else
  95 void hugetlb_prefault_arch_hook(struct mm_struct *mm);
  96 #endif
  97
  98 #else /* !CONFIG_HUGETLB_PAGE */
  99
 100 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
 101 {
 102         return 0;
 103 }
 104 static inline unsigned long hugetlb_total_pages(void)
 105 {
 106         return 0;
 107 }
 108
 109 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
 110 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 111 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 112 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
 113 #define unmap_hugepage_range(vma, start, end)   BUG()
 114 #define hugetlb_report_meminfo(buf)             0
 115 #define hugetlb_report_node_meminfo(n, buf)     0
 116 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
 117 #define prepare_hugepage_range(addr,len)        (-EINVAL)
 118 #define pmd_huge(x)     0
 119 #define is_hugepage_only_range(mm, addr, len)   0
 120 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 121 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
 122
 123 #define hugetlb_change_protection(vma, address, end, newprot)
 124
 125 #ifndef HPAGE_MASK
 126 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 127 #define HPAGE_SIZE      PAGE_SIZE
 128 #endif
 129
 130 #endif /* !CONFIG_HUGETLB_PAGE */
 131
 132 #ifdef CONFIG_HUGETLBFS
 133 struct hugetlbfs_config {
 134         uid_t   uid;
 135         gid_t   gid;
 136         umode_t mode;
 137         long    nr_blocks;
 138         long    nr_inodes;
 139 };
 140
 141 struct hugetlbfs_sb_info {
 142         long    max_blocks;   /* blocks allowed */
 143         long    free_blocks;  /* blocks free */
 144         long    max_inodes;   /* inodes allowed */
 145         long    free_inodes;  /* inodes free */
 146         spinlock_t      stat_lock;
 147 };
 148
 149
 150 struct hugetlbfs_inode_info {
 151         struct shared_policy policy;
 152         struct inode vfs_inode;
 153 };
 154
 155 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 156 {
 157         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 158 }
 159
 160 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 161 {
 162         return sb->s_fs_info;
 163 }
 164
 165 extern const struct file_operations hugetlbfs_file_operations;
 166 extern struct vm_operations_struct hugetlb_vm_ops;
 167 struct file *hugetlb_file_setup(const char *name, size_t);
 168 int hugetlb_get_quota(struct address_space *mapping, long delta);
 169 void hugetlb_put_quota(struct address_space *mapping, long delta);
 170
 171 #define BLOCKS_PER_HUGEPAGE     (HPAGE_SIZE / 512)
 172
 173 static inline int is_file_hugepages(struct file *file)
 174 {
 175         if (file->f_op == &hugetlbfs_file_operations)
 176                 return 1;
 177         if (is_file_shm_hugepages(file))
 178                 return 1;
 179
 180         return 0;
 181 }
 182
 183 static inline void set_file_hugepages(struct file *file)
 184 {
 185         file->f_op = &hugetlbfs_file_operations;
 186 }
 187 #else /* !CONFIG_HUGETLBFS */
 188
 189 #define is_file_hugepages(file)         0
 190 #define set_file_hugepages(file)        BUG()
 191 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
 192
 193 #endif /* !CONFIG_HUGETLBFS */
 194
 195 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 196 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 197                                         unsigned long len, unsigned long pgoff,
 198                                         unsigned long flags);
 199 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 200
 201 #endif /* _LINUX_HUGETLB_H */