1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #include <linux/mm_types.h>
6 #include <linux/hugetlb_inline.h>
12 #ifdef CONFIG_HUGETLB_PAGE
14 #include <linux/mempolicy.h>
15 #include <linux/shm.h>
16 #include <asm/tlbflush.h>
18 struct hugepage_subpool {
21 long max_hpages, used_hpages;
24 extern spinlock_t hugetlb_lock;
25 extern int hugetlb_max_hstate __read_mostly;
26 #define for_each_hstate(h) \
27 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
29 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
30 void hugepage_put_subpool(struct hugepage_subpool *spool);
32 int PageHuge(struct page *page);
34 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
35 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
36 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
37 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
40 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
41 void __user *, size_t *, loff_t *);
44 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
45 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
46 struct page **, struct vm_area_struct **,
47 unsigned long *, int *, int, unsigned int flags);
48 void unmap_hugepage_range(struct vm_area_struct *,
49 unsigned long, unsigned long, struct page *);
50 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
51 unsigned long start, unsigned long end,
52 struct page *ref_page);
53 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
54 void hugetlb_report_meminfo(struct seq_file *);
55 int hugetlb_report_node_meminfo(int, char *);
56 unsigned long hugetlb_total_pages(void);
57 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
58 unsigned long address, unsigned int flags);
59 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
60 struct vm_area_struct *vma,
62 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
63 int dequeue_hwpoisoned_huge_page(struct page *page);
64 void copy_huge_page(struct page *dst, struct page *src);
66 extern unsigned long hugepages_treat_as_movable;
67 extern const unsigned long hugetlb_zero, hugetlb_infinity;
68 extern int sysctl_hugetlb_shm_group;
69 extern struct list_head huge_boot_pages;
73 pte_t *huge_pte_alloc(struct mm_struct *mm,
74 unsigned long addr, unsigned long sz);
75 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
76 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
77 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
79 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
80 pmd_t *pmd, int write);
81 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
82 pud_t *pud, int write);
83 int pmd_huge(pmd_t pmd);
84 int pud_huge(pud_t pmd);
85 void hugetlb_change_protection(struct vm_area_struct *vma,
86 unsigned long address, unsigned long end, pgprot_t newprot);
88 #else /* !CONFIG_HUGETLB_PAGE */
90 static inline int PageHuge(struct page *page)
95 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
99 static inline unsigned long hugetlb_total_pages(void)
104 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
105 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
106 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
107 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
108 static inline void hugetlb_report_meminfo(struct seq_file *m)
111 #define hugetlb_report_node_meminfo(n, buf) 0
112 #define follow_huge_pmd(mm, addr, pmd, write) NULL
113 #define follow_huge_pud(mm, addr, pud, write) NULL
114 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
115 #define pmd_huge(x) 0
116 #define pud_huge(x) 0
117 #define is_hugepage_only_range(mm, addr, len) 0
118 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
119 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
120 #define huge_pte_offset(mm, address) 0
121 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
126 static inline void copy_huge_page(struct page *dst, struct page *src)
130 #define hugetlb_change_protection(vma, address, end, newprot)
132 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
133 struct vm_area_struct *vma, unsigned long start,
134 unsigned long end, struct page *ref_page)
139 #endif /* !CONFIG_HUGETLB_PAGE */
141 #define HUGETLB_ANON_FILE "anon_hugepage"
145 * The file will be used as an shm file so shmfs accounting rules
148 HUGETLB_SHMFS_INODE = 1,
150 * The file is being created on the internal vfs mount and shmfs
151 * accounting rules do not apply
153 HUGETLB_ANONHUGE_INODE = 2,
156 #ifdef CONFIG_HUGETLBFS
157 struct hugetlbfs_sb_info {
158 long max_inodes; /* inodes allowed */
159 long free_inodes; /* inodes free */
160 spinlock_t stat_lock;
161 struct hstate *hstate;
162 struct hugepage_subpool *spool;
165 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
167 return sb->s_fs_info;
170 extern const struct file_operations hugetlbfs_file_operations;
171 extern const struct vm_operations_struct hugetlb_vm_ops;
172 struct file *hugetlb_file_setup(const char *name, unsigned long addr,
173 size_t size, vm_flags_t acct,
174 struct user_struct **user, int creat_flags);
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 #else /* !CONFIG_HUGETLBFS */
188 #define is_file_hugepages(file) 0
189 static inline struct file *
190 hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
191 vm_flags_t acctflag, struct user_struct **user, int creat_flags)
193 return ERR_PTR(-ENOSYS);
196 #endif /* !CONFIG_HUGETLBFS */
198 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
199 unsigned 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 */
204 #ifdef CONFIG_HUGETLB_PAGE
206 #define HSTATE_NAME_LEN 32
207 /* Defines one hugetlb page size */
209 int next_nid_to_alloc;
210 int next_nid_to_free;
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_activelist;
220 struct list_head hugepage_freelists[MAX_NUMNODES];
221 unsigned int nr_huge_pages_node[MAX_NUMNODES];
222 unsigned int free_huge_pages_node[MAX_NUMNODES];
223 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
224 char name[HSTATE_NAME_LEN];
227 struct huge_bootmem_page {
228 struct list_head list;
229 struct hstate *hstate;
230 #ifdef CONFIG_HIGHMEM
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 #ifndef arch_make_huge_pte
306 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
307 struct page *page, int writable)
313 static inline struct hstate *page_hstate(struct page *page)
315 return size_to_hstate(PAGE_SIZE << compound_order(page));
318 static inline unsigned hstate_index_to_shift(unsigned index)
320 return hstates[index].order + PAGE_SHIFT;
323 static inline int hstate_index(struct hstate *h)
330 #define alloc_huge_page_node(h, nid) NULL
331 #define alloc_bootmem_huge_page(h) NULL
332 #define hstate_file(f) NULL
333 #define hstate_vma(v) NULL
334 #define hstate_inode(i) NULL
335 #define huge_page_size(h) PAGE_SIZE
336 #define huge_page_mask(h) PAGE_MASK
337 #define vma_kernel_pagesize(v) PAGE_SIZE
338 #define vma_mmu_pagesize(v) PAGE_SIZE
339 #define huge_page_order(h) 0
340 #define huge_page_shift(h) PAGE_SHIFT
341 static inline unsigned int pages_per_huge_page(struct hstate *h)
345 #define hstate_index_to_shift(index) 0
346 #define hstate_index(h) 0
349 #endif /* _LINUX_HUGETLB_H */