LXR linux/include/linux/hugetlb.h

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