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 *,
  28                         struct page **, struct vm_area_struct **,
  29                         unsigned long *, int *, int, unsigned int flags);
  30 void unmap_hugepage_range(struct vm_area_struct *,
  31                         unsigned long, unsigned long, struct page *);
  32 void __unmap_hugepage_range(struct vm_area_struct *,
  33                         unsigned long, unsigned long, struct page *);
  34 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  35 void hugetlb_report_meminfo(struct seq_file *);
  36 int hugetlb_report_node_meminfo(int, char *);
  37 unsigned long hugetlb_total_pages(void);
  38 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  39                         unsigned long address, unsigned int flags);
  40 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  41                                                 struct vm_area_struct *vma,
  42                                                 int acctflags);
  43 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  44
  45 extern unsigned long hugepages_treat_as_movable;
  46 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  47 extern int sysctl_hugetlb_shm_group;
  48 extern struct list_head huge_boot_pages;
  49
  50 /* arch callbacks */
  51
  52 pte_t *huge_pte_alloc(struct mm_struct *mm,
  53                         unsigned long addr, unsigned long sz);
  54 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  55 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  56 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  57                               int write);
  58 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  59                                 pmd_t *pmd, int write);
  60 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  61                                 pud_t *pud, int write);
  62 int pmd_huge(pmd_t pmd);
  63 int pud_huge(pud_t pmd);
  64 void hugetlb_change_protection(struct vm_area_struct *vma,
  65                 unsigned long address, unsigned long end, pgprot_t newprot);
  66
  67 #else /* !CONFIG_HUGETLB_PAGE */
  68
  69 static inline int PageHuge(struct page *page)
  70 {
  71         return 0;
  72 }
  73
  74 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
  75 {
  76         return 0;
  77 }
  78
  79 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  80 {
  81 }
  82
  83 static inline unsigned long hugetlb_total_pages(void)
  84 {
  85         return 0;
  86 }
  87
  88 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
  89 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
  90 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
  91 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
  92 #define unmap_hugepage_range(vma, start, end, page)     BUG()
  93 static inline void hugetlb_report_meminfo(struct seq_file *m)
  94 {
  95 }
  96 #define hugetlb_report_node_meminfo(n, buf)     0
  97 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
  98 #define follow_huge_pud(mm, addr, pud, write)   NULL
  99 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
 100 #define pmd_huge(x)     0
 101 #define pud_huge(x)     0
 102 #define is_hugepage_only_range(mm, addr, len)   0
 103 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 104 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 105
 106 #define hugetlb_change_protection(vma, address, end, newprot)
 107
 108 #ifndef HPAGE_MASK
 109 #define HPAGE_MASK      PAGE_MASK               /* Keep the compiler happy */
 110 #define HPAGE_SIZE      PAGE_SIZE
 111 #endif
 112
 113 #endif /* !CONFIG_HUGETLB_PAGE */
 114
 115 #ifdef CONFIG_HUGETLBFS
 116 struct hugetlbfs_config {
 117         uid_t   uid;
 118         gid_t   gid;
 119         umode_t mode;
 120         long    nr_blocks;
 121         long    nr_inodes;
 122         struct hstate *hstate;
 123 };
 124
 125 struct hugetlbfs_sb_info {
 126         long    max_blocks;   /* blocks allowed */
 127         long    free_blocks;  /* blocks free */
 128         long    max_inodes;   /* inodes allowed */
 129         long    free_inodes;  /* inodes free */
 130         spinlock_t      stat_lock;
 131         struct hstate *hstate;
 132 };
 133
 134
 135 struct hugetlbfs_inode_info {
 136         struct shared_policy policy;
 137         struct inode vfs_inode;
 138 };
 139
 140 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 141 {
 142         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 143 }
 144
 145 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 146 {
 147         return sb->s_fs_info;
 148 }
 149
 150 extern const struct file_operations hugetlbfs_file_operations;
 151 extern struct vm_operations_struct hugetlb_vm_ops;
 152 struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
 153                                                 struct user_struct **user);
 154 int hugetlb_get_quota(struct address_space *mapping, long delta);
 155 void hugetlb_put_quota(struct address_space *mapping, long delta);
 156
 157 static inline int is_file_hugepages(struct file *file)
 158 {
 159         if (file->f_op == &hugetlbfs_file_operations)
 160                 return 1;
 161         if (is_file_shm_hugepages(file))
 162                 return 1;
 163
 164         return 0;
 165 }
 166
 167 static inline void set_file_hugepages(struct file *file)
 168 {
 169         file->f_op = &hugetlbfs_file_operations;
 170 }
 171 #else /* !CONFIG_HUGETLBFS */
 172
 173 #define is_file_hugepages(file)                 0
 174 #define set_file_hugepages(file)                BUG()
 175 #define hugetlb_file_setup(name,size,acct,user) ERR_PTR(-ENOSYS)
 176
 177 #endif /* !CONFIG_HUGETLBFS */
 178
 179 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 180 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 181                                         unsigned long len, unsigned long pgoff,
 182                                         unsigned long flags);
 183 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 184
 185 #ifdef CONFIG_HUGETLB_PAGE
 186
 187 #define HSTATE_NAME_LEN 32
 188 /* Defines one hugetlb page size */
 189 struct hstate {
 190         int next_nid_to_alloc;
 191         int next_nid_to_free;
 192         unsigned int order;
 193         unsigned long mask;
 194         unsigned long max_huge_pages;
 195         unsigned long nr_huge_pages;
 196         unsigned long free_huge_pages;
 197         unsigned long resv_huge_pages;
 198         unsigned long surplus_huge_pages;
 199         unsigned long nr_overcommit_huge_pages;
 200         struct list_head hugepage_freelists[MAX_NUMNODES];
 201         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 202         unsigned int free_huge_pages_node[MAX_NUMNODES];
 203         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 204         char name[HSTATE_NAME_LEN];
 205 };
 206
 207 struct huge_bootmem_page {
 208         struct list_head list;
 209         struct hstate *hstate;
 210 };
 211
 212 /* arch callback */
 213 int __init alloc_bootmem_huge_page(struct hstate *h);
 214
 215 void __init hugetlb_add_hstate(unsigned order);
 216 struct hstate *size_to_hstate(unsigned long size);
 217
 218 #ifndef HUGE_MAX_HSTATE
 219 #define HUGE_MAX_HSTATE 1
 220 #endif
 221
 222 extern struct hstate hstates[HUGE_MAX_HSTATE];
 223 extern unsigned int default_hstate_idx;
 224
 225 #define default_hstate (hstates[default_hstate_idx])
 226
 227 static inline struct hstate *hstate_inode(struct inode *i)
 228 {
 229         struct hugetlbfs_sb_info *hsb;
 230         hsb = HUGETLBFS_SB(i->i_sb);
 231         return hsb->hstate;
 232 }
 233
 234 static inline struct hstate *hstate_file(struct file *f)
 235 {
 236         return hstate_inode(f->f_dentry->d_inode);
 237 }
 238
 239 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 240 {
 241         return hstate_file(vma->vm_file);
 242 }
 243
 244 static inline unsigned long huge_page_size(struct hstate *h)
 245 {
 246         return (unsigned long)PAGE_SIZE << h->order;
 247 }
 248
 249 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 250
 251 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 252
 253 static inline unsigned long huge_page_mask(struct hstate *h)
 254 {
 255         return h->mask;
 256 }
 257
 258 static inline unsigned int huge_page_order(struct hstate *h)
 259 {
 260         return h->order;
 261 }
 262
 263 static inline unsigned huge_page_shift(struct hstate *h)
 264 {
 265         return h->order + PAGE_SHIFT;
 266 }
 267
 268 static inline unsigned int pages_per_huge_page(struct hstate *h)
 269 {
 270         return 1 << h->order;
 271 }
 272
 273 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 274 {
 275         return huge_page_size(h) / 512;
 276 }
 277
 278 #include <asm/hugetlb.h>
 279
 280 static inline struct hstate *page_hstate(struct page *page)
 281 {
 282         return size_to_hstate(PAGE_SIZE << compound_order(page));
 283 }
 284
 285 #else
 286 struct hstate {};
 287 #define alloc_bootmem_huge_page(h) NULL
 288 #define hstate_file(f) NULL
 289 #define hstate_vma(v) NULL
 290 #define hstate_inode(i) NULL
 291 #define huge_page_size(h) PAGE_SIZE
 292 #define huge_page_mask(h) PAGE_MASK
 293 #define vma_kernel_pagesize(v) PAGE_SIZE
 294 #define vma_mmu_pagesize(v) PAGE_SIZE
 295 #define huge_page_order(h) 0
 296 #define huge_page_shift(h) PAGE_SHIFT
 297 static inline unsigned int pages_per_huge_page(struct hstate *h)
 298 {
 299         return 1;
 300 }
 301 #endif
 302
 303 #endif /* _LINUX_HUGETLB_H */