include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #include <linux/fs.h>
   5 #include <linux/hugetlb_inline.h>
   6
   7 struct ctl_table;
   8 struct user_struct;
   9
  10 #ifdef CONFIG_HUGETLB_PAGE
  11
  12 #include <linux/mempolicy.h>
  13 #include <linux/shm.h>
  14 #include <asm/tlbflush.h>
  15
  16 int PageHuge(struct page *page);
  17
  18 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  19 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  20 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  21 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  22
  23 #ifdef CONFIG_NUMA
  24 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  25                                         void __user *, size_t *, loff_t *);
  26 #endif
  27
  28 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  29 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  30                         struct page **, struct vm_area_struct **,
  31                         unsigned long *, int *, int, unsigned int flags);
  32 void unmap_hugepage_range(struct vm_area_struct *,
  33                         unsigned long, unsigned long, struct page *);
  34 void __unmap_hugepage_range(struct vm_area_struct *,
  35                         unsigned long, unsigned long, struct page *);
  36 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  37 void hugetlb_report_meminfo(struct seq_file *);
  38 int hugetlb_report_node_meminfo(int, char *);
  39 unsigned long hugetlb_total_pages(void);
  40 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  41                         unsigned long address, unsigned int flags);
  42 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  43                                                 struct vm_area_struct *vma,
  44                                                 int acctflags);
  45 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  46 int dequeue_hwpoisoned_huge_page(struct page *page);
  47 void copy_huge_page(struct page *dst, struct page *src);
  48
  49 extern unsigned long hugepages_treat_as_movable;
  50 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  51 extern int sysctl_hugetlb_shm_group;
  52 extern struct list_head huge_boot_pages;
  53
  54 /* arch callbacks */
  55
  56 pte_t *huge_pte_alloc(struct mm_struct *mm,
  57                         unsigned long addr, unsigned long sz);
  58 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  59 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  60 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  61                               int write);
  62 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  63                                 pmd_t *pmd, int write);
  64 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  65                                 pud_t *pud, int write);
  66 int pmd_huge(pmd_t pmd);
  67 int pud_huge(pud_t pmd);
  68 void hugetlb_change_protection(struct vm_area_struct *vma,
  69                 unsigned long address, unsigned long end, pgprot_t newprot);
  70
  71 #else /* !CONFIG_HUGETLB_PAGE */
  72
  73 static inline int PageHuge(struct page *page)
  74 {
  75         return 0;
  76 }
  77
  78 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  79 {
  80 }
  81
  82 static inline unsigned long hugetlb_total_pages(void)
  83 {
  84         return 0;
  85 }
  86
  87 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  88 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  89 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  90 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  91 #define unmap_hugepage_range(vma, start, end, page)     BUG()
  92 static inline void hugetlb_report_meminfo(struct seq_file *m)
  93 {
  94 }
  95 #define hugetlb_report_node_meminfo(n, buf)     0
  96 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  97 #define follow_huge_pud(mm, addr, pud, write)   NULL
  98 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
  99 #define pmd_huge(x)     0
 100 #define pud_huge(x)     0
 101 #define is_hugepage_only_range(mm, addr, len)   0
 102 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 103 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 104 #define huge_pte_offset(mm, address)    0
 105 #define dequeue_hwpoisoned_huge_page(page)      0
 106 static inline void copy_huge_page(struct page *dst, struct page *src)
 107 {
 108 }
 109
 110 #define hugetlb_change_protection(vma, address, end, newprot)
 111
 112 #ifndef HPAGE_MASK
 113 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 114 #define HPAGE_SIZE      PAGE_SIZE
 115 #endif
 116
 117 #endif /* !CONFIG_HUGETLB_PAGE */
 118
 119 #define HUGETLB_ANON_FILE "anon_hugepage"
 120
 121 enum {
 122         /*
 123          * The file will be used as an shm file so shmfs accounting rules
 124          * apply
 125          */
 126         HUGETLB_SHMFS_INODE     = 1,
 127         /*
 128          * The file is being created on the internal vfs mount and shmfs
 129          * accounting rules do not apply
 130          */
 131         HUGETLB_ANONHUGE_INODE  = 2,
 132 };
 133
 134 #ifdef CONFIG_HUGETLBFS
 135 struct hugetlbfs_config {
 136         uid_t   uid;
 137         gid_t   gid;
 138         umode_t mode;
 139         long    nr_blocks;
 140         long    nr_inodes;
 141         struct hstate *hstate;
 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         struct hstate *hstate;
 151 };
 152
 153
 154 struct hugetlbfs_inode_info {
 155         struct shared_policy policy;
 156         struct inode vfs_inode;
 157 };
 158
 159 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 160 {
 161         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 162 }
 163
 164 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 165 {
 166         return sb->s_fs_info;
 167 }
 168
 169 extern const struct file_operations hugetlbfs_file_operations;
 170 extern const struct vm_operations_struct hugetlb_vm_ops;
 171 struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
 172                                 struct user_struct **user, int creat_flags);
 173 int hugetlb_get_quota(struct address_space *mapping, long delta);
 174 void hugetlb_put_quota(struct address_space *mapping, long delta);
 175
 176 static inline int is_file_hugepages(struct file *file)
 177 {
 178         if (file->f_op == &hugetlbfs_file_operations)
 179                 return 1;
 180         if (is_file_shm_hugepages(file))
 181                 return 1;
 182
 183         return 0;
 184 }
 185
 186 static inline void set_file_hugepages(struct file *file)
 187 {
 188         file->f_op = &hugetlbfs_file_operations;
 189 }
 190 #else /* !CONFIG_HUGETLBFS */
 191
 192 #define is_file_hugepages(file)                 0
 193 #define set_file_hugepages(file)                BUG()
 194 static inline struct file *hugetlb_file_setup(const char *name, size_t size,
 195                 int acctflag, struct user_struct **user, int creat_flags)
 196 {
 197         return ERR_PTR(-ENOSYS);
 198 }
 199
 200 #endif /* !CONFIG_HUGETLBFS */
 201
 202 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 203 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 204                                         unsigned long len, unsigned long pgoff,
 205                                         unsigned long flags);
 206 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 207
 208 #ifdef CONFIG_HUGETLB_PAGE
 209
 210 #define HSTATE_NAME_LEN 32
 211 /* Defines one hugetlb page size */
 212 struct hstate {
 213         int next_nid_to_alloc;
 214         int next_nid_to_free;
 215         unsigned int order;
 216         unsigned long mask;
 217         unsigned long max_huge_pages;
 218         unsigned long nr_huge_pages;
 219         unsigned long free_huge_pages;
 220         unsigned long resv_huge_pages;
 221         unsigned long surplus_huge_pages;
 222         unsigned long nr_overcommit_huge_pages;
 223         struct list_head hugepage_freelists[MAX_NUMNODES];
 224         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 225         unsigned int free_huge_pages_node[MAX_NUMNODES];
 226         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 227         char name[HSTATE_NAME_LEN];
 228 };
 229
 230 struct huge_bootmem_page {
 231         struct list_head list;
 232         struct hstate *hstate;
 233 };
 234
 235 struct page *alloc_huge_page_node(struct hstate *h, int nid);
 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 static inline unsigned hstate_index_to_shift(unsigned index)
 311 {
 312         return hstates[index].order + PAGE_SHIFT;
 313 }
 314
 315 #else
 316 struct hstate {};
 317 #define alloc_huge_page_node(h, nid) NULL
 318 #define alloc_bootmem_huge_page(h) NULL
 319 #define hstate_file(f) NULL
 320 #define hstate_vma(v) NULL
 321 #define hstate_inode(i) NULL
 322 #define huge_page_size(h) PAGE_SIZE
 323 #define huge_page_mask(h) PAGE_MASK
 324 #define vma_kernel_pagesize(v) PAGE_SIZE
 325 #define vma_mmu_pagesize(v) PAGE_SIZE
 326 #define huge_page_order(h) 0
 327 #define huge_page_shift(h) PAGE_SHIFT
 328 static inline unsigned int pages_per_huge_page(struct hstate *h)
 329 {
 330         return 1;
 331 }
 332 #define hstate_index_to_shift(index) 0
 333 #endif
 334
 335 #endif /* _LINUX_HUGETLB_H */