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 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  20 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  21 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  22 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  23 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  24 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
  25 void unmap_hugepage_range(struct vm_area_struct *,
  26                         unsigned long, unsigned long, struct page *);
  27 void __unmap_hugepage_range(struct vm_area_struct *,
  28                         unsigned long, unsigned long, struct page *);
  29 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  30 int hugetlb_report_meminfo(char *);
  31 int hugetlb_report_node_meminfo(int, char *);
  32 unsigned long hugetlb_total_pages(void);
  33 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  34                         unsigned long address, int write_access);
  35 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  36                                                 struct vm_area_struct *vma);
  37 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  38
  39 extern unsigned long max_huge_pages;
  40 extern unsigned long sysctl_overcommit_huge_pages;
  41 extern unsigned long hugepages_treat_as_movable;
  42 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  43 extern int sysctl_hugetlb_shm_group;
  44
  45 /* arch callbacks */
  46
  47 pte_t *huge_pte_alloc(struct mm_struct *mm,
  48                         unsigned long addr, unsigned long sz);
  49 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  50 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  51 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  52                               int write);
  53 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  54                                 pmd_t *pmd, int write);
  55 int pmd_huge(pmd_t pmd);
  56 void hugetlb_change_protection(struct vm_area_struct *vma,
  57                 unsigned long address, unsigned long end, pgprot_t newprot);
  58
  59 #else /* !CONFIG_HUGETLB_PAGE */
  60
  61 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  62 {
  63         return 0;
  64 }
  65
  66 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  67 {
  68 }
  69
  70 static inline unsigned long hugetlb_total_pages(void)
  71 {
  72         return 0;
  73 }
  74
  75 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  76 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  77 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  78 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  79 #define unmap_hugepage_range(vma, start, end, page)     BUG()
  80 #define hugetlb_report_meminfo(buf)             0
  81 #define hugetlb_report_node_meminfo(n, buf)     0
  82 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  83 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
  84 #define pmd_huge(x)     0
  85 #define is_hugepage_only_range(mm, addr, len)   0
  86 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
  87 #define hugetlb_fault(mm, vma, addr, write)     ({ BUG(); 0; })
  88
  89 #define hugetlb_change_protection(vma, address, end, newprot)
  90
  91 #ifndef HPAGE_MASK
  92 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
  93 #define HPAGE_SIZE      PAGE_SIZE
  94 #endif
  95
  96 #endif /* !CONFIG_HUGETLB_PAGE */
  97
  98 #ifdef CONFIG_HUGETLBFS
  99 struct hugetlbfs_config {
 100         uid_t   uid;
 101         gid_t   gid;
 102         umode_t mode;
 103         long    nr_blocks;
 104         long    nr_inodes;
 105 };
 106
 107 struct hugetlbfs_sb_info {
 108         long    max_blocks;   /* blocks allowed */
 109         long    free_blocks;  /* blocks free */
 110         long    max_inodes;   /* inodes allowed */
 111         long    free_inodes;  /* inodes free */
 112         spinlock_t      stat_lock;
 113 };
 114
 115
 116 struct hugetlbfs_inode_info {
 117         struct shared_policy policy;
 118         struct inode vfs_inode;
 119 };
 120
 121 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 122 {
 123         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 124 }
 125
 126 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 127 {
 128         return sb->s_fs_info;
 129 }
 130
 131 extern const struct file_operations hugetlbfs_file_operations;
 132 extern struct vm_operations_struct hugetlb_vm_ops;
 133 struct file *hugetlb_file_setup(const char *name, size_t);
 134 int hugetlb_get_quota(struct address_space *mapping, long delta);
 135 void hugetlb_put_quota(struct address_space *mapping, long delta);
 136
 137 static inline int is_file_hugepages(struct file *file)
 138 {
 139         if (file->f_op == &hugetlbfs_file_operations)
 140                 return 1;
 141         if (is_file_shm_hugepages(file))
 142                 return 1;
 143
 144         return 0;
 145 }
 146
 147 static inline void set_file_hugepages(struct file *file)
 148 {
 149         file->f_op = &hugetlbfs_file_operations;
 150 }
 151 #else /* !CONFIG_HUGETLBFS */
 152
 153 #define is_file_hugepages(file)         0
 154 #define set_file_hugepages(file)        BUG()
 155 #define hugetlb_file_setup(name,size)   ERR_PTR(-ENOSYS)
 156
 157 #endif /* !CONFIG_HUGETLBFS */
 158
 159 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 160 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 161                                         unsigned long len, unsigned long pgoff,
 162                                         unsigned long flags);
 163 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 164
 165 #ifdef CONFIG_HUGETLB_PAGE
 166
 167 /* Defines one hugetlb page size */
 168 struct hstate {
 169         int hugetlb_next_nid;
 170         unsigned int order;
 171         unsigned long mask;
 172         unsigned long max_huge_pages;
 173         unsigned long nr_huge_pages;
 174         unsigned long free_huge_pages;
 175         unsigned long resv_huge_pages;
 176         unsigned long surplus_huge_pages;
 177         unsigned long nr_overcommit_huge_pages;
 178         struct list_head hugepage_freelists[MAX_NUMNODES];
 179         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 180         unsigned int free_huge_pages_node[MAX_NUMNODES];
 181         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 182 };
 183
 184 extern struct hstate default_hstate;
 185
 186 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 187 {
 188         return &default_hstate;
 189 }
 190
 191 static inline struct hstate *hstate_file(struct file *f)
 192 {
 193         return &default_hstate;
 194 }
 195
 196 static inline struct hstate *hstate_inode(struct inode *i)
 197 {
 198         return &default_hstate;
 199 }
 200
 201 static inline unsigned long huge_page_size(struct hstate *h)
 202 {
 203         return (unsigned long)PAGE_SIZE << h->order;
 204 }
 205
 206 static inline unsigned long huge_page_mask(struct hstate *h)
 207 {
 208         return h->mask;
 209 }
 210
 211 static inline unsigned int huge_page_order(struct hstate *h)
 212 {
 213         return h->order;
 214 }
 215
 216 static inline unsigned huge_page_shift(struct hstate *h)
 217 {
 218         return h->order + PAGE_SHIFT;
 219 }
 220
 221 static inline unsigned int pages_per_huge_page(struct hstate *h)
 222 {
 223         return 1 << h->order;
 224 }
 225
 226 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 227 {
 228         return huge_page_size(h) / 512;
 229 }
 230
 231 #include <asm/hugetlb.h>
 232
 233 #else
 234 struct hstate {};
 235 #define hstate_file(f) NULL
 236 #define hstate_vma(v) NULL
 237 #define hstate_inode(i) NULL
 238 #define huge_page_size(h) PAGE_SIZE
 239 #define huge_page_mask(h) PAGE_MASK
 240 #define huge_page_order(h) 0
 241 #define huge_page_shift(h) PAGE_SHIFT
 242 #define pages_per_huge_page(h) 1
 243 #endif
 244
 245 #endif /* _LINUX_HUGETLB_H */