include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #include <linux/fs.h>
   5
   6 struct ctl_table;
   7 struct user_struct;
   8
   9 #ifdef CONFIG_HUGETLB_PAGE
  10
  11 #include <linux/mempolicy.h>
  12 #include <linux/shm.h>
  13 #include <asm/tlbflush.h>
  14
  15 struct hugepage_subpool {
  16         spinlock_t lock;
  17         long count;
  18         long max_hpages, used_hpages;
  19 };
  20
  21 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
  22 void hugepage_put_subpool(struct hugepage_subpool *spool);
  23
  24 int PageHuge(struct page *page);
  25
  26 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  27 {
  28         return vma->vm_flags & VM_HUGETLB;
  29 }
  30
  31 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  32 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  33 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  34 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  35 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  36 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  37                         struct page **, struct vm_area_struct **,
  38                         unsigned long *, int *, int, unsigned int flags);
  39 void unmap_hugepage_range(struct vm_area_struct *,
  40                         unsigned long, unsigned long, struct page *);
  41 void __unmap_hugepage_range(struct vm_area_struct *,
  42                         unsigned long, unsigned long, struct page *);
  43 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  44 void hugetlb_report_meminfo(struct seq_file *);
  45 int hugetlb_report_node_meminfo(int, char *);
  46 unsigned long hugetlb_total_pages(void);
  47 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  48                         unsigned long address, unsigned int flags);
  49 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  50                                                 struct vm_area_struct *vma,
  51                                                 int acctflags);
  52 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  53
  54 extern unsigned long hugepages_treat_as_movable;
  55 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  56 extern int sysctl_hugetlb_shm_group;
  57 extern struct list_head huge_boot_pages;
  58
  59 /* arch callbacks */
  60
  61 pte_t *huge_pte_alloc(struct mm_struct *mm,
  62                         unsigned long addr, unsigned long sz);
  63 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  64 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  65 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  66                               int write);
  67 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  68                                 pmd_t *pmd, int write);
  69 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  70                                 pud_t *pud, int write);
  71 int pmd_huge(pmd_t pmd);
  72 int pud_huge(pud_t pmd);
  73 void hugetlb_change_protection(struct vm_area_struct *vma,
  74                 unsigned long address, unsigned long end, pgprot_t newprot);
  75
  76 #else /* !CONFIG_HUGETLB_PAGE */
  77
  78 static inline int PageHuge(struct page *page)
  79 {
  80         return 0;
  81 }
  82
  83 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  84 {
  85         return 0;
  86 }
  87
  88 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  89 {
  90 }
  91
  92 static inline unsigned long hugetlb_total_pages(void)
  93 {
  94         return 0;
  95 }
  96
  97 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  98 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  99 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 100 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
 101 #define unmap_hugepage_range(vma, start, end, page)     BUG()
 102 static inline void hugetlb_report_meminfo(struct seq_file *m)
 103 {
 104 }
 105 #define hugetlb_report_node_meminfo(n, buf)     0
 106 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
 107 #define follow_huge_pud(mm, addr, pud, write)   NULL
 108 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
 109 #define pmd_huge(x)     0
 110 #define pud_huge(x)     0
 111 #define is_hugepage_only_range(mm, addr, len)   0
 112 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 113 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 114
 115 #define hugetlb_change_protection(vma, address, end, newprot)
 116
 117 #ifndef HPAGE_MASK
 118 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 119 #define HPAGE_SIZE      PAGE_SIZE
 120 #endif
 121
 122 #endif /* !CONFIG_HUGETLB_PAGE */
 123
 124 #define HUGETLB_ANON_FILE "anon_hugepage"
 125
 126 enum {
 127         /*
 128          * The file will be used as an shm file so shmfs accounting rules
 129          * apply
 130          */
 131         HUGETLB_SHMFS_INODE     = 1,
 132         /*
 133          * The file is being created on the internal vfs mount and shmfs
 134          * accounting rules do not apply
 135          */
 136         HUGETLB_ANONHUGE_INODE  = 2,
 137 };
 138
 139 #ifdef CONFIG_HUGETLBFS
 140 struct hugetlbfs_config {
 141         uid_t   uid;
 142         gid_t   gid;
 143         umode_t mode;
 144         long    nr_blocks;
 145         long    nr_inodes;
 146         struct hstate *hstate;
 147 };
 148
 149 struct hugetlbfs_sb_info {
 150         long    max_inodes;   /* inodes allowed */
 151         long    free_inodes;  /* inodes free */
 152         spinlock_t      stat_lock;
 153         struct hstate *hstate;
 154         struct hugepage_subpool *spool;
 155 };
 156
 157
 158 struct hugetlbfs_inode_info {
 159         struct shared_policy policy;
 160         struct inode vfs_inode;
 161 };
 162
 163 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 164 {
 165         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 166 }
 167
 168 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 169 {
 170         return sb->s_fs_info;
 171 }
 172
 173 extern const struct file_operations hugetlbfs_file_operations;
 174 extern const struct vm_operations_struct hugetlb_vm_ops;
 175 struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
 176                                 struct user_struct **user, int creat_flags);
 177
 178 static inline int is_file_hugepages(struct file *file)
 179 {
 180         if (file->f_op == &hugetlbfs_file_operations)
 181                 return 1;
 182         if (is_file_shm_hugepages(file))
 183                 return 1;
 184
 185         return 0;
 186 }
 187
 188 static inline void set_file_hugepages(struct file *file)
 189 {
 190         file->f_op = &hugetlbfs_file_operations;
 191 }
 192 #else /* !CONFIG_HUGETLBFS */
 193
 194 #define is_file_hugepages(file)                 0
 195 #define set_file_hugepages(file)                BUG()
 196 static inline struct file *hugetlb_file_setup(const char *name, size_t size,
 197                 int acctflag, struct user_struct **user, int creat_flags)
 198 {
 199         return ERR_PTR(-ENOSYS);
 200 }
 201
 202 #endif /* !CONFIG_HUGETLBFS */
 203
 204 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 205 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 206                                         unsigned long len, unsigned long pgoff,
 207                                         unsigned long flags);
 208 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 209
 210 #ifdef CONFIG_HUGETLB_PAGE
 211
 212 #define HSTATE_NAME_LEN 32
 213 /* Defines one hugetlb page size */
 214 struct hstate {
 215         int next_nid_to_alloc;
 216         int next_nid_to_free;
 217         unsigned int order;
 218         unsigned long mask;
 219         unsigned long max_huge_pages;
 220         unsigned long nr_huge_pages;
 221         unsigned long free_huge_pages;
 222         unsigned long resv_huge_pages;
 223         unsigned long surplus_huge_pages;
 224         unsigned long nr_overcommit_huge_pages;
 225         struct list_head hugepage_freelists[MAX_NUMNODES];
 226         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 227         unsigned int free_huge_pages_node[MAX_NUMNODES];
 228         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 229         char name[HSTATE_NAME_LEN];
 230 };
 231
 232 struct huge_bootmem_page {
 233         struct list_head list;
 234         struct hstate *hstate;
 235 };
 236
 237 /* arch callback */
 238 int __init alloc_bootmem_huge_page(struct hstate *h);
 239
 240 void __init hugetlb_add_hstate(unsigned order);
 241 struct hstate *size_to_hstate(unsigned long size);
 242
 243 #ifndef HUGE_MAX_HSTATE
 244 #define HUGE_MAX_HSTATE 1
 245 #endif
 246
 247 extern struct hstate hstates[HUGE_MAX_HSTATE];
 248 extern unsigned int default_hstate_idx;
 249
 250 #define default_hstate (hstates[default_hstate_idx])
 251
 252 static inline struct hstate *hstate_inode(struct inode *i)
 253 {
 254         struct hugetlbfs_sb_info *hsb;
 255         hsb = HUGETLBFS_SB(i->i_sb);
 256         return hsb->hstate;
 257 }
 258
 259 static inline struct hstate *hstate_file(struct file *f)
 260 {
 261         return hstate_inode(f->f_dentry->d_inode);
 262 }
 263
 264 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 265 {
 266         return hstate_file(vma->vm_file);
 267 }
 268
 269 static inline unsigned long huge_page_size(struct hstate *h)
 270 {
 271         return (unsigned long)PAGE_SIZE << h->order;
 272 }
 273
 274 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 275
 276 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 277
 278 static inline unsigned long huge_page_mask(struct hstate *h)
 279 {
 280         return h->mask;
 281 }
 282
 283 static inline unsigned int huge_page_order(struct hstate *h)
 284 {
 285         return h->order;
 286 }
 287
 288 static inline unsigned huge_page_shift(struct hstate *h)
 289 {
 290         return h->order + PAGE_SHIFT;
 291 }
 292
 293 static inline unsigned int pages_per_huge_page(struct hstate *h)
 294 {
 295         return 1 << h->order;
 296 }
 297
 298 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 299 {
 300         return huge_page_size(h) / 512;
 301 }
 302
 303 #include <asm/hugetlb.h>
 304
 305 static inline struct hstate *page_hstate(struct page *page)
 306 {
 307         return size_to_hstate(PAGE_SIZE << compound_order(page));
 308 }
 309
 310 #else
 311 struct hstate {};
 312 #define alloc_bootmem_huge_page(h) NULL
 313 #define hstate_file(f) NULL
 314 #define hstate_vma(v) NULL
 315 #define hstate_inode(i) NULL
 316 #define huge_page_size(h) PAGE_SIZE
 317 #define huge_page_mask(h) PAGE_MASK
 318 #define vma_kernel_pagesize(v) PAGE_SIZE
 319 #define vma_mmu_pagesize(v) PAGE_SIZE
 320 #define huge_page_order(h) 0
 321 #define huge_page_shift(h) PAGE_SHIFT
 322 static inline unsigned int pages_per_huge_page(struct hstate *h)
 323 {
 324         return 1;
 325 }
 326 #endif
 327
 328 #endif /* _LINUX_HUGETLB_H */