1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
5 #include <linux/hugetlb_inline.h>
10 #ifdef CONFIG_HUGETLB_PAGE
12 #include <linux/mempolicy.h>
13 #include <linux/shm.h>
14 #include <asm/tlbflush.h>
16 int PageHuge(struct page *page);
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 *);
24 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
25 void __user *, size_t *, loff_t *);
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,
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);
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;
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,
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);
71 #else /* !CONFIG_HUGETLB_PAGE */
73 static inline int PageHuge(struct page *page)
78 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
82 static inline unsigned long hugetlb_total_pages(void)
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)
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)
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)
110 #define hugetlb_change_protection(vma, address, end, newprot)
113 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
114 #define HPAGE_SIZE PAGE_SIZE
117 #endif /* !CONFIG_HUGETLB_PAGE */
119 #define HUGETLB_ANON_FILE "anon_hugepage"
123 * The file will be used as an shm file so shmfs accounting rules
126 HUGETLB_SHMFS_INODE = 1,
128 * The file is being created on the internal vfs mount and shmfs
129 * accounting rules do not apply
131 HUGETLB_ANONHUGE_INODE = 2,
134 #ifdef CONFIG_HUGETLBFS
135 struct hugetlbfs_config {
141 struct hstate *hstate;
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;
154 struct hugetlbfs_inode_info {
155 struct shared_policy policy;
156 struct inode vfs_inode;
159 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
161 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
164 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
166 return sb->s_fs_info;
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);
176 static inline int is_file_hugepages(struct file *file)
178 if (file->f_op == &hugetlbfs_file_operations)
180 if (is_file_shm_hugepages(file))
186 static inline void set_file_hugepages(struct file *file)
188 file->f_op = &hugetlbfs_file_operations;
190 #else /* !CONFIG_HUGETLBFS */
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)
197 return ERR_PTR(-ENOSYS);
200 #endif /* !CONFIG_HUGETLBFS */
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 */
208 #ifdef CONFIG_HUGETLB_PAGE
210 #define HSTATE_NAME_LEN 32
211 /* Defines one hugetlb page size */
213 int next_nid_to_alloc;
214 int next_nid_to_free;
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];
230 struct huge_bootmem_page {
231 struct list_head list;
232 struct hstate *hstate;
235 struct page *alloc_huge_page_node(struct hstate *h, int nid);
238 int __init alloc_bootmem_huge_page(struct hstate *h);
240 void __init hugetlb_add_hstate(unsigned order);
241 struct hstate *size_to_hstate(unsigned long size);
243 #ifndef HUGE_MAX_HSTATE
244 #define HUGE_MAX_HSTATE 1
247 extern struct hstate hstates[HUGE_MAX_HSTATE];
248 extern unsigned int default_hstate_idx;
250 #define default_hstate (hstates[default_hstate_idx])
252 static inline struct hstate *hstate_inode(struct inode *i)
254 struct hugetlbfs_sb_info *hsb;
255 hsb = HUGETLBFS_SB(i->i_sb);
259 static inline struct hstate *hstate_file(struct file *f)
261 return hstate_inode(f->f_dentry->d_inode);
264 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
266 return hstate_file(vma->vm_file);
269 static inline unsigned long huge_page_size(struct hstate *h)
271 return (unsigned long)PAGE_SIZE << h->order;
274 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
276 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
278 static inline unsigned long huge_page_mask(struct hstate *h)
283 static inline unsigned int huge_page_order(struct hstate *h)
288 static inline unsigned huge_page_shift(struct hstate *h)
290 return h->order + PAGE_SHIFT;
293 static inline unsigned int pages_per_huge_page(struct hstate *h)
295 return 1 << h->order;
298 static inline unsigned int blocks_per_huge_page(struct hstate *h)
300 return huge_page_size(h) / 512;
303 #include <asm/hugetlb.h>
305 static inline struct hstate *page_hstate(struct page *page)
307 return size_to_hstate(PAGE_SIZE << compound_order(page));
310 static inline unsigned hstate_index_to_shift(unsigned index)
312 return hstates[index].order + PAGE_SHIFT;
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)
332 #define hstate_index_to_shift(index) 0
335 #endif /* _LINUX_HUGETLB_H */