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 struct user_struct;
  14
  15 int PageHuge(struct page *page);
  16
  17 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  18 {
  19         return vma->vm_flags & VM_HUGETLB;
  20 }
  21
  22 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  23 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  24 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  25 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
  26 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  27 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
  28 void unmap_hugepage_range(struct vm_area_struct *,
  29                         unsigned long, unsigned long, struct page *);
  30 void __unmap_hugepage_range(struct vm_area_struct *,
  31                         unsigned long, unsigned long, struct page *);
  32 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  33 void hugetlb_report_meminfo(struct seq_file *);
  34 int hugetlb_report_node_meminfo(int, char *);
  35 unsigned long hugetlb_total_pages(void);
  36 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  37                         unsigned long address, unsigned int flags);
  38 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  39                                                 struct vm_area_struct *vma,
  40                                                 int acctflags);
  41 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  42
  43 extern unsigned long hugepages_treat_as_movable;
  44 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  45 extern int sysctl_hugetlb_shm_group;
  46 extern struct list_head huge_boot_pages;
  47
  48 /* arch callbacks */
  49
  50 pte_t *huge_pte_alloc(struct mm_struct *mm,
  51                         unsigned long addr, unsigned long sz);
  52 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  53 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  54 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  55                               int write);
  56 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  57                                 pmd_t *pmd, int write);
  58 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  59                                 pud_t *pud, int write);
  60 int pmd_huge(pmd_t pmd);
  61 int pud_huge(pud_t pmd);
  62 void hugetlb_change_protection(struct vm_area_struct *vma,
  63                 unsigned long address, unsigned long end, pgprot_t newprot);
  64
  65 #else /* !CONFIG_HUGETLB_PAGE */
  66
  67 static inline int PageHuge(struct page *page)
  68 {
  69         return 0;
  70 }
  71
  72 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  73 {
  74         return 0;
  75 }
  76
  77 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  78 {
  79 }
  80
  81 static inline unsigned long hugetlb_total_pages(void)
  82 {
  83         return 0;
  84 }
  85
  86 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  87 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  88 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  89 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  90 #define unmap_hugepage_range(vma, start, end, page)     BUG()
  91 static inline void hugetlb_report_meminfo(struct seq_file *m)
  92 {
  93 }
  94 #define hugetlb_report_node_meminfo(n, buf)     0
  95 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  96 #define follow_huge_pud(mm, addr, pud, write)   NULL
  97 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
  98 #define pmd_huge(x)     0
  99 #define pud_huge(x)     0
 100 #define is_hugepage_only_range(mm, addr, len)   0
 101 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 102 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 103
 104 #define hugetlb_change_protection(vma, address, end, newprot)
 105
 106 #ifndef HPAGE_MASK
 107 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 108 #define HPAGE_SIZE      PAGE_SIZE
 109 #endif
 110
 111 #endif /* !CONFIG_HUGETLB_PAGE */
 112
 113 #ifdef CONFIG_HUGETLBFS
 114 struct hugetlbfs_config {
 115         uid_t   uid;
 116         gid_t   gid;
 117         umode_t mode;
 118         long    nr_blocks;
 119         long    nr_inodes;
 120         struct hstate *hstate;
 121 };
 122
 123 struct hugetlbfs_sb_info {
 124         long    max_blocks;   /* blocks allowed */
 125         long    free_blocks;  /* blocks free */
 126         long    max_inodes;   /* inodes allowed */
 127         long    free_inodes;  /* inodes free */
 128         spinlock_t      stat_lock;
 129         struct hstate *hstate;
 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 const struct file_operations hugetlbfs_file_operations;
 149 extern struct vm_operations_struct hugetlb_vm_ops;
 150 struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
 151                                                 struct user_struct **user);
 152 int hugetlb_get_quota(struct address_space *mapping, long delta);
 153 void hugetlb_put_quota(struct address_space *mapping, long delta);
 154
 155 static inline int is_file_hugepages(struct file *file)
 156 {
 157         if (file->f_op == &hugetlbfs_file_operations)
 158                 return 1;
 159         if (is_file_shm_hugepages(file))
 160                 return 1;
 161
 162         return 0;
 163 }
 164
 165 static inline void set_file_hugepages(struct file *file)
 166 {
 167         file->f_op = &hugetlbfs_file_operations;
 168 }
 169 #else /* !CONFIG_HUGETLBFS */
 170
 171 #define is_file_hugepages(file)                 0
 172 #define set_file_hugepages(file)                BUG()
 173 #define hugetlb_file_setup(name,size,acct,user) ERR_PTR(-ENOSYS)
 174
 175 #endif /* !CONFIG_HUGETLBFS */
 176
 177 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 178 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 179                                         unsigned long len, unsigned long pgoff,
 180                                         unsigned long flags);
 181 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 182
 183 #ifdef CONFIG_HUGETLB_PAGE
 184
 185 #define HSTATE_NAME_LEN 32
 186 /* Defines one hugetlb page size */
 187 struct hstate {
 188         int hugetlb_next_nid;
 189         unsigned int order;
 190         unsigned long mask;
 191         unsigned long max_huge_pages;
 192         unsigned long nr_huge_pages;
 193         unsigned long free_huge_pages;
 194         unsigned long resv_huge_pages;
 195         unsigned long surplus_huge_pages;
 196         unsigned long nr_overcommit_huge_pages;
 197         struct list_head hugepage_freelists[MAX_NUMNODES];
 198         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 199         unsigned int free_huge_pages_node[MAX_NUMNODES];
 200         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 201         char name[HSTATE_NAME_LEN];
 202 };
 203
 204 struct huge_bootmem_page {
 205         struct list_head list;
 206         struct hstate *hstate;
 207 };
 208
 209 /* arch callback */
 210 int __init alloc_bootmem_huge_page(struct hstate *h);
 211
 212 void __init hugetlb_add_hstate(unsigned order);
 213 struct hstate *size_to_hstate(unsigned long size);
 214
 215 #ifndef HUGE_MAX_HSTATE
 216 #define HUGE_MAX_HSTATE 1
 217 #endif
 218
 219 extern struct hstate hstates[HUGE_MAX_HSTATE];
 220 extern unsigned int default_hstate_idx;
 221
 222 #define default_hstate (hstates[default_hstate_idx])
 223
 224 static inline struct hstate *hstate_inode(struct inode *i)
 225 {
 226         struct hugetlbfs_sb_info *hsb;
 227         hsb = HUGETLBFS_SB(i->i_sb);
 228         return hsb->hstate;
 229 }
 230
 231 static inline struct hstate *hstate_file(struct file *f)
 232 {
 233         return hstate_inode(f->f_dentry->d_inode);
 234 }
 235
 236 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 237 {
 238         return hstate_file(vma->vm_file);
 239 }
 240
 241 static inline unsigned long huge_page_size(struct hstate *h)
 242 {
 243         return (unsigned long)PAGE_SIZE << h->order;
 244 }
 245
 246 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 247
 248 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 249
 250 static inline unsigned long huge_page_mask(struct hstate *h)
 251 {
 252         return h->mask;
 253 }
 254
 255 static inline unsigned int huge_page_order(struct hstate *h)
 256 {
 257         return h->order;
 258 }
 259
 260 static inline unsigned huge_page_shift(struct hstate *h)
 261 {
 262         return h->order + PAGE_SHIFT;
 263 }
 264
 265 static inline unsigned int pages_per_huge_page(struct hstate *h)
 266 {
 267         return 1 << h->order;
 268 }
 269
 270 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 271 {
 272         return huge_page_size(h) / 512;
 273 }
 274
 275 #include <asm/hugetlb.h>
 276
 277 static inline struct hstate *page_hstate(struct page *page)
 278 {
 279         return size_to_hstate(PAGE_SIZE << compound_order(page));
 280 }
 281
 282 #else
 283 struct hstate {};
 284 #define alloc_bootmem_huge_page(h) NULL
 285 #define hstate_file(f) NULL
 286 #define hstate_vma(v) NULL
 287 #define hstate_inode(i) NULL
 288 #define huge_page_size(h) PAGE_SIZE
 289 #define huge_page_mask(h) PAGE_MASK
 290 #define vma_kernel_pagesize(v) PAGE_SIZE
 291 #define vma_mmu_pagesize(v) PAGE_SIZE
 292 #define huge_page_order(h) 0
 293 #define huge_page_shift(h) PAGE_SHIFT
 294 static inline unsigned int pages_per_huge_page(struct hstate *h)
 295 {
 296         return 1;
 297 }
 298 #endif
 299
 300 #endif /* _LINUX_HUGETLB_H */