LXR linux/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
   7struct ctl_table;
   8struct 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
  16int PageHuge(struct page *page);
  17
  18void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  19int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  20int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  21int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  22
  23#ifdef CONFIG_NUMA
  24int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  25                                        void __user *, size_t *, loff_t *);
  26#endif
  27
  28int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  29int 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);
  32void unmap_hugepage_range(struct vm_area_struct *,
  33                        unsigned long, unsigned long, struct page *);
  34void __unmap_hugepage_range(struct vm_area_struct *,
  35                        unsigned long, unsigned long, struct page *);
  36int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  37void hugetlb_report_meminfo(struct seq_file *);
  38int hugetlb_report_node_meminfo(int, char *);
  39unsigned long hugetlb_total_pages(void);
  40int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  41                        unsigned long address, unsigned int flags);
  42int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  43                                                struct vm_area_struct *vma,
  44                                                int acctflags);
  45void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  46int dequeue_hwpoisoned_huge_page(struct page *page);
  47void copy_huge_page(struct page *dst, struct page *src);
  48
  49extern unsigned long hugepages_treat_as_movable;
  50extern const unsigned long hugetlb_zero, hugetlb_infinity;
  51extern int sysctl_hugetlb_shm_group;
  52extern struct list_head huge_boot_pages;
  53
  54/* arch callbacks */
  55
  56pte_t *huge_pte_alloc(struct mm_struct *mm,
  57                        unsigned long addr, unsigned long sz);
  58pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  59int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  60struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  61                              int write);
  62struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  63                                pmd_t *pmd, int write);
  64struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  65                                pud_t *pud, int write);
  66int pmd_huge(pmd_t pmd);
  67int pud_huge(pud_t pmd);
  68void 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
  73static inline int PageHuge(struct page *page)
  74{
  75        return 0;
  76}
  77
  78static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
  79{
  80}
  81
  82static 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()
  92static 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
 106static 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
 121enum {
 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
 135struct 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
 144struct 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
 154struct hugetlbfs_inode_info {
 155        struct shared_policy policy;
 156        struct inode vfs_inode;
 157};
 158
 159static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 160{
 161        return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 162}
 163
 164static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 165{
 166        return sb->s_fs_info;
 167}
 168
 169extern const struct file_operations hugetlbfs_file_operations;
 170extern const struct vm_operations_struct hugetlb_vm_ops;
 171struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
 172                                struct user_struct **user, int creat_flags);
 173int hugetlb_get_quota(struct address_space *mapping, long delta);
 174void hugetlb_put_quota(struct address_space *mapping, long delta);
 175
 176static 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
 186static 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()
 194static 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
 203unsigned 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 */
 212struct 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
 230struct huge_bootmem_page {
 231        struct list_head list;
 232        struct hstate *hstate;
 233};
 234
 235struct page *alloc_huge_page_node(struct hstate *h, int nid);
 236
 237/* arch callback */
 238int __init alloc_bootmem_huge_page(struct hstate *h);
 239
 240void __init hugetlb_add_hstate(unsigned order);
 241struct hstate *size_to_hstate(unsigned long size);
 242
 243#ifndef HUGE_MAX_HSTATE
 244#define HUGE_MAX_HSTATE 1
 245#endif
 246
 247extern struct hstate hstates[HUGE_MAX_HSTATE];
 248extern unsigned int default_hstate_idx;
 249
 250#define default_hstate (hstates[default_hstate_idx])
 251
 252static 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
 259static inline struct hstate *hstate_file(struct file *f)
 260{
 261        return hstate_inode(f->f_dentry->d_inode);
 262}
 263
 264static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 265{
 266        return hstate_file(vma->vm_file);
 267}
 268
 269static inline unsigned long huge_page_size(struct hstate *h)
 270{
 271        return (unsigned long)PAGE_SIZE << h->order;
 272}
 273
 274extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 275
 276extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 277
 278static inline unsigned long huge_page_mask(struct hstate *h)
 279{
 280        return h->mask;
 281}
 282
 283static inline unsigned int huge_page_order(struct hstate *h)
 284{
 285        return h->order;
 286}
 287
 288static inline unsigned huge_page_shift(struct hstate *h)
 289{
 290        return h->order + PAGE_SHIFT;
 291}
 292
 293static inline unsigned int pages_per_huge_page(struct hstate *h)
 294{
 295        return 1 << h->order;
 296}
 297
 298static 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
 305static inline struct hstate *page_hstate(struct page *page)
 306{
 307        return size_to_hstate(PAGE_SIZE << compound_order(page));
 308}
 309
 310static inline unsigned hstate_index_to_shift(unsigned index)
 311{
 312        return hstates[index].order + PAGE_SHIFT;
 313}
 314
 315#else
 316struct 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
 328static 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 */
 336