1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #include <linux/mm_types.h>
6 #include <linux/hugetlb_inline.h>
11 #ifdef CONFIG_HUGETLB_PAGE
13 #include <linux/mempolicy.h>
14 #include <linux/shm.h>
15 #include <asm/tlbflush.h>
17 struct hugepage_subpool {
20 long max_hpages, used_hpages;
23 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
24 void hugepage_put_subpool(struct hugepage_subpool *spool);
26 int PageHuge(struct page *page);
28 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
29 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
30 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
31 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
34 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
35 void __user *, size_t *, loff_t *);
38 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
39 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
40 struct page **, struct vm_area_struct **,
41 unsigned long *, int *, int, unsigned int flags);
42 void unmap_hugepage_range(struct vm_area_struct *,
43 unsigned long, unsigned long, struct page *);
44 void __unmap_hugepage_range_final(struct vm_area_struct *vma,
45 unsigned long start, unsigned long end,
46 struct page *ref_page);
47 void __unmap_hugepage_range(struct vm_area_struct *,
48 unsigned long, unsigned long, struct page *);
49 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
50 void hugetlb_report_meminfo(struct seq_file *);
51 int hugetlb_report_node_meminfo(int, char *);
52 unsigned long hugetlb_total_pages(void);
53 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
54 unsigned long address, unsigned int flags);
55 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
56 struct vm_area_struct *vma,
58 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
59 int dequeue_hwpoisoned_huge_page(struct page *page);
60 void copy_huge_page(struct page *dst, struct page *src);
62 extern unsigned long hugepages_treat_as_movable;
63 extern const unsigned long hugetlb_zero, hugetlb_infinity;
64 extern int sysctl_hugetlb_shm_group;
65 extern struct list_head huge_boot_pages;
69 pte_t *huge_pte_alloc(struct mm_struct *mm,
70 unsigned long addr, unsigned long sz);
71 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
72 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
73 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
75 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
76 pmd_t *pmd, int write);
77 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
78 pud_t *pud, int write);
79 int pmd_huge(pmd_t pmd);
80 int pud_huge(pud_t pmd);
81 void hugetlb_change_protection(struct vm_area_struct *vma,
82 unsigned long address, unsigned long end, pgprot_t newprot);
84 #else /* !CONFIG_HUGETLB_PAGE */
86 static inline int PageHuge(struct page *page)
91 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
95 static inline unsigned long hugetlb_total_pages(void)
100 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
101 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
102 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
103 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
104 #define unmap_hugepage_range(vma, start, end, page) BUG()
105 static inline void __unmap_hugepage_range_final(struct vm_area_struct *vma,
106 unsigned long start, unsigned long end,
107 struct page *ref_page)
112 static inline void hugetlb_report_meminfo(struct seq_file *m)
115 #define hugetlb_report_node_meminfo(n, buf) 0
116 #define follow_huge_pmd(mm, addr, pmd, write) NULL
117 #define follow_huge_pud(mm, addr, pud, write) NULL
118 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
119 #define pmd_huge(x) 0
120 #define pud_huge(x) 0
121 #define is_hugepage_only_range(mm, addr, len) 0
122 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
123 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
124 #define huge_pte_offset(mm, address) 0
125 #define dequeue_hwpoisoned_huge_page(page) 0
126 static inline void copy_huge_page(struct page *dst, struct page *src)
130 #define hugetlb_change_protection(vma, address, end, newprot)
132 #endif /* !CONFIG_HUGETLB_PAGE */
134 #define HUGETLB_ANON_FILE "anon_hugepage"
138 * The file will be used as an shm file so shmfs accounting rules
141 HUGETLB_SHMFS_INODE = 1,
143 * The file is being created on the internal vfs mount and shmfs
144 * accounting rules do not apply
146 HUGETLB_ANONHUGE_INODE = 2,
149 #ifdef CONFIG_HUGETLBFS
150 struct hugetlbfs_config {
156 struct hstate *hstate;
159 struct hugetlbfs_sb_info {
160 long max_inodes; /* inodes allowed */
161 long free_inodes; /* inodes free */
162 spinlock_t stat_lock;
163 struct hstate *hstate;
164 struct hugepage_subpool *spool;
168 struct hugetlbfs_inode_info {
169 struct shared_policy policy;
170 struct inode vfs_inode;
173 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
175 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
178 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
180 return sb->s_fs_info;
183 extern const struct file_operations hugetlbfs_file_operations;
184 extern const struct vm_operations_struct hugetlb_vm_ops;
185 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
186 struct user_struct **user, int creat_flags);
188 static inline int is_file_hugepages(struct file *file)
190 if (file->f_op == &hugetlbfs_file_operations)
192 if (is_file_shm_hugepages(file))
198 static inline void set_file_hugepages(struct file *file)
200 file->f_op = &hugetlbfs_file_operations;
202 #else /* !CONFIG_HUGETLBFS */
204 #define is_file_hugepages(file) 0
205 #define set_file_hugepages(file) BUG()
206 static inline struct file *hugetlb_file_setup(const char *name, size_t size,
207 vm_flags_t acctflag, struct user_struct **user, int creat_flags)
209 return ERR_PTR(-ENOSYS);
212 #endif /* !CONFIG_HUGETLBFS */
214 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
215 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
216 unsigned long len, unsigned long pgoff,
217 unsigned long flags);
218 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
220 #ifdef CONFIG_HUGETLB_PAGE
222 #define HSTATE_NAME_LEN 32
223 /* Defines one hugetlb page size */
225 int next_nid_to_alloc;
226 int next_nid_to_free;
229 unsigned long max_huge_pages;
230 unsigned long nr_huge_pages;
231 unsigned long free_huge_pages;
232 unsigned long resv_huge_pages;
233 unsigned long surplus_huge_pages;
234 unsigned long nr_overcommit_huge_pages;
235 struct list_head hugepage_freelists[MAX_NUMNODES];
236 unsigned int nr_huge_pages_node[MAX_NUMNODES];
237 unsigned int free_huge_pages_node[MAX_NUMNODES];
238 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
239 char name[HSTATE_NAME_LEN];
242 struct huge_bootmem_page {
243 struct list_head list;
244 struct hstate *hstate;
245 #ifdef CONFIG_HIGHMEM
250 struct page *alloc_huge_page_node(struct hstate *h, int nid);
253 int __init alloc_bootmem_huge_page(struct hstate *h);
255 void __init hugetlb_add_hstate(unsigned order);
256 struct hstate *size_to_hstate(unsigned long size);
258 #ifndef HUGE_MAX_HSTATE
259 #define HUGE_MAX_HSTATE 1
262 extern struct hstate hstates[HUGE_MAX_HSTATE];
263 extern unsigned int default_hstate_idx;
265 #define default_hstate (hstates[default_hstate_idx])
267 static inline struct hstate *hstate_inode(struct inode *i)
269 struct hugetlbfs_sb_info *hsb;
270 hsb = HUGETLBFS_SB(i->i_sb);
274 static inline struct hstate *hstate_file(struct file *f)
276 return hstate_inode(f->f_dentry->d_inode);
279 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
281 return hstate_file(vma->vm_file);
284 static inline unsigned long huge_page_size(struct hstate *h)
286 return (unsigned long)PAGE_SIZE << h->order;
289 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
291 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
293 static inline unsigned long huge_page_mask(struct hstate *h)
298 static inline unsigned int huge_page_order(struct hstate *h)
303 static inline unsigned huge_page_shift(struct hstate *h)
305 return h->order + PAGE_SHIFT;
308 static inline unsigned int pages_per_huge_page(struct hstate *h)
310 return 1 << h->order;
313 static inline unsigned int blocks_per_huge_page(struct hstate *h)
315 return huge_page_size(h) / 512;
318 #include <asm/hugetlb.h>
320 static inline struct hstate *page_hstate(struct page *page)
322 return size_to_hstate(PAGE_SIZE << compound_order(page));
325 static inline unsigned hstate_index_to_shift(unsigned index)
327 return hstates[index].order + PAGE_SHIFT;
332 #define alloc_huge_page_node(h, nid) NULL
333 #define alloc_bootmem_huge_page(h) NULL
334 #define hstate_file(f) NULL
335 #define hstate_vma(v) NULL
336 #define hstate_inode(i) NULL
337 #define huge_page_size(h) PAGE_SIZE
338 #define huge_page_mask(h) PAGE_MASK
339 #define vma_kernel_pagesize(v) PAGE_SIZE
340 #define vma_mmu_pagesize(v) PAGE_SIZE
341 #define huge_page_order(h) 0
342 #define huge_page_shift(h) PAGE_SHIFT
343 static inline unsigned int pages_per_huge_page(struct hstate *h)
347 #define hstate_index_to_shift(index) 0
350 #endif /* _LINUX_HUGETLB_H */