1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
9 #ifdef CONFIG_HUGETLB_PAGE
11 #include <linux/mempolicy.h>
12 #include <linux/shm.h>
13 #include <asm/tlbflush.h>
15 int PageHuge(struct page *page);
17 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
19 return vma->vm_flags & VM_HUGETLB;
22 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
23 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
24 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
25 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
28 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
29 void __user *, size_t *, loff_t *);
32 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
33 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
34 struct page **, struct vm_area_struct **,
35 unsigned long *, int *, int, unsigned int flags);
36 void unmap_hugepage_range(struct vm_area_struct *,
37 unsigned long, unsigned long, struct page *);
38 void __unmap_hugepage_range(struct vm_area_struct *,
39 unsigned long, unsigned long, struct page *);
40 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
41 void hugetlb_report_meminfo(struct seq_file *);
42 int hugetlb_report_node_meminfo(int, char *);
43 unsigned long hugetlb_total_pages(void);
44 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
45 unsigned long address, unsigned int flags);
46 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
47 struct vm_area_struct *vma,
49 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
51 extern unsigned long hugepages_treat_as_movable;
52 extern const unsigned long hugetlb_zero, hugetlb_infinity;
53 extern int sysctl_hugetlb_shm_group;
54 extern struct list_head huge_boot_pages;
58 pte_t *huge_pte_alloc(struct mm_struct *mm,
59 unsigned long addr, unsigned long sz);
60 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
61 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
62 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
64 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
65 pmd_t *pmd, int write);
66 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
67 pud_t *pud, int write);
68 int pmd_huge(pmd_t pmd);
69 int pud_huge(pud_t pmd);
70 void hugetlb_change_protection(struct vm_area_struct *vma,
71 unsigned long address, unsigned long end, pgprot_t newprot);
73 #else /* !CONFIG_HUGETLB_PAGE */
75 static inline int PageHuge(struct page *page)
80 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
85 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
89 static inline unsigned long hugetlb_total_pages(void)
94 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
95 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
96 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
97 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
98 #define unmap_hugepage_range(vma, start, end, page) BUG()
99 static inline void hugetlb_report_meminfo(struct seq_file *m)
102 #define hugetlb_report_node_meminfo(n, buf) 0
103 #define follow_huge_pmd(mm, addr, pmd, write) NULL
104 #define follow_huge_pud(mm, addr, pud, write) NULL
105 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
106 #define pmd_huge(x) 0
107 #define pud_huge(x) 0
108 #define is_hugepage_only_range(mm, addr, len) 0
109 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
110 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
112 #define hugetlb_change_protection(vma, address, end, newprot)
115 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
116 #define HPAGE_SIZE PAGE_SIZE
119 #endif /* !CONFIG_HUGETLB_PAGE */
121 #define HUGETLB_ANON_FILE "anon_hugepage"
125 * The file will be used as an shm file so shmfs accounting rules
128 HUGETLB_SHMFS_INODE = 1,
130 * The file is being created on the internal vfs mount and shmfs
131 * accounting rules do not apply
133 HUGETLB_ANONHUGE_INODE = 2,
136 #ifdef CONFIG_HUGETLBFS
137 struct hugetlbfs_config {
143 struct hstate *hstate;
146 struct hugetlbfs_sb_info {
147 long max_blocks; /* blocks allowed */
148 long free_blocks; /* blocks free */
149 long max_inodes; /* inodes allowed */
150 long free_inodes; /* inodes free */
151 spinlock_t stat_lock;
152 struct hstate *hstate;
156 struct hugetlbfs_inode_info {
157 struct shared_policy policy;
158 struct inode vfs_inode;
161 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
163 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
166 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
168 return sb->s_fs_info;
171 extern const struct file_operations hugetlbfs_file_operations;
172 extern const struct vm_operations_struct hugetlb_vm_ops;
173 struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
174 struct user_struct **user, int creat_flags);
175 int hugetlb_get_quota(struct address_space *mapping, long delta);
176 void hugetlb_put_quota(struct address_space *mapping, long delta);
178 static inline int is_file_hugepages(struct file *file)
180 if (file->f_op == &hugetlbfs_file_operations)
182 if (is_file_shm_hugepages(file))
188 static inline void set_file_hugepages(struct file *file)
190 file->f_op = &hugetlbfs_file_operations;
192 #else /* !CONFIG_HUGETLBFS */
194 #define is_file_hugepages(file) 0
195 #define set_file_hugepages(file) BUG()
196 static inline struct file *hugetlb_file_setup(const char *name, size_t size,
197 int acctflag, struct user_struct **user, int creat_flags)
199 return ERR_PTR(-ENOSYS);
202 #endif /* !CONFIG_HUGETLBFS */
204 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
205 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
206 unsigned long len, unsigned long pgoff,
207 unsigned long flags);
208 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
210 #ifdef CONFIG_HUGETLB_PAGE
212 #define HSTATE_NAME_LEN 32
213 /* Defines one hugetlb page size */
215 int next_nid_to_alloc;
216 int next_nid_to_free;
219 unsigned long max_huge_pages;
220 unsigned long nr_huge_pages;
221 unsigned long free_huge_pages;
222 unsigned long resv_huge_pages;
223 unsigned long surplus_huge_pages;
224 unsigned long nr_overcommit_huge_pages;
225 struct list_head hugepage_freelists[MAX_NUMNODES];
226 unsigned int nr_huge_pages_node[MAX_NUMNODES];
227 unsigned int free_huge_pages_node[MAX_NUMNODES];
228 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
229 char name[HSTATE_NAME_LEN];
232 struct huge_bootmem_page {
233 struct list_head list;
234 struct hstate *hstate;
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));
312 #define alloc_bootmem_huge_page(h) NULL
313 #define hstate_file(f) NULL
314 #define hstate_vma(v) NULL
315 #define hstate_inode(i) NULL
316 #define huge_page_size(h) PAGE_SIZE
317 #define huge_page_mask(h) PAGE_MASK
318 #define vma_kernel_pagesize(v) PAGE_SIZE
319 #define vma_mmu_pagesize(v) PAGE_SIZE
320 #define huge_page_order(h) 0
321 #define huge_page_shift(h) PAGE_SHIFT
322 static inline unsigned int pages_per_huge_page(struct hstate *h)
328 #endif /* _LINUX_HUGETLB_H */