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);
27 int PageHuge(struct page *page);
29 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
30 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
31 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
32 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
35 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
36 void __user *, size_t *, loff_t *);
39 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
40 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
41 struct page **, struct vm_area_struct **,
42 unsigned long *, int *, int, unsigned int flags);
43 void unmap_hugepage_range(struct vm_area_struct *,
44 unsigned long, unsigned long, struct page *);
45 void __unmap_hugepage_range(struct vm_area_struct *,
46 unsigned long, unsigned long, struct page *);
47 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
48 void hugetlb_report_meminfo(struct seq_file *);
49 int hugetlb_report_node_meminfo(int, char *);
50 unsigned long hugetlb_total_pages(void);
51 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
52 unsigned long address, unsigned int flags);
53 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
54 struct vm_area_struct *vma,
56 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
57 int dequeue_hwpoisoned_huge_page(struct page *page);
58 void copy_huge_page(struct page *dst, struct page *src);
60 extern unsigned long hugepages_treat_as_movable;
61 extern const unsigned long hugetlb_zero, hugetlb_infinity;
62 extern int sysctl_hugetlb_shm_group;
63 extern struct list_head huge_boot_pages;
67 pte_t *huge_pte_alloc(struct mm_struct *mm,
68 unsigned long addr, unsigned long sz);
69 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
70 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
71 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
73 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
74 pmd_t *pmd, int write);
75 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
76 pud_t *pud, int write);
77 int pmd_huge(pmd_t pmd);
78 int pud_huge(pud_t pmd);
79 void hugetlb_change_protection(struct vm_area_struct *vma,
80 unsigned long address, unsigned long end, pgprot_t newprot);
82 #else /* !CONFIG_HUGETLB_PAGE */
84 static inline int PageHuge(struct page *page)
89 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
93 static inline unsigned long hugetlb_total_pages(void)
98 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
99 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
100 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
101 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
102 #define unmap_hugepage_range(vma, start, end, page) BUG()
103 static inline void hugetlb_report_meminfo(struct seq_file *m)
106 #define hugetlb_report_node_meminfo(n, buf) 0
107 #define follow_huge_pmd(mm, addr, pmd, write) NULL
108 #define follow_huge_pud(mm, addr, pud, write) NULL
109 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
110 #define pmd_huge(x) 0
111 #define pud_huge(x) 0
112 #define is_hugepage_only_range(mm, addr, len) 0
113 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
114 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
115 #define huge_pte_offset(mm, address) 0
116 #define dequeue_hwpoisoned_huge_page(page) 0
117 static inline void copy_huge_page(struct page *dst, struct page *src)
121 #define hugetlb_change_protection(vma, address, end, newprot)
124 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
125 #define HPAGE_SIZE PAGE_SIZE
128 #endif /* !CONFIG_HUGETLB_PAGE */
130 #define HUGETLB_ANON_FILE "anon_hugepage"
134 * The file will be used as an shm file so shmfs accounting rules
137 HUGETLB_SHMFS_INODE = 1,
139 * The file is being created on the internal vfs mount and shmfs
140 * accounting rules do not apply
142 HUGETLB_ANONHUGE_INODE = 2,
145 #ifdef CONFIG_HUGETLBFS
146 struct hugetlbfs_config {
152 struct hstate *hstate;
155 struct hugetlbfs_sb_info {
156 long max_inodes; /* inodes allowed */
157 long free_inodes; /* inodes free */
158 spinlock_t stat_lock;
159 struct hstate *hstate;
160 struct hugepage_subpool *spool;
164 struct hugetlbfs_inode_info {
165 struct shared_policy policy;
166 struct inode vfs_inode;
169 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
171 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
174 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
176 return sb->s_fs_info;
179 extern const struct file_operations hugetlbfs_file_operations;
180 extern const struct vm_operations_struct hugetlb_vm_ops;
181 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
182 struct user_struct **user, int creat_flags);
184 static inline int is_file_hugepages(struct file *file)
186 if (file->f_op == &hugetlbfs_file_operations)
188 if (is_file_shm_hugepages(file))
194 static inline void set_file_hugepages(struct file *file)
196 file->f_op = &hugetlbfs_file_operations;
198 #else /* !CONFIG_HUGETLBFS */
200 #define is_file_hugepages(file) 0
201 #define set_file_hugepages(file) BUG()
202 static inline struct file *hugetlb_file_setup(const char *name, size_t size,
203 vm_flags_t acctflag, struct user_struct **user, int creat_flags)
205 return ERR_PTR(-ENOSYS);
208 #endif /* !CONFIG_HUGETLBFS */
210 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
211 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
212 unsigned long len, unsigned long pgoff,
213 unsigned long flags);
214 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
216 #ifdef CONFIG_HUGETLB_PAGE
218 #define HSTATE_NAME_LEN 32
219 /* Defines one hugetlb page size */
221 int next_nid_to_alloc;
222 int next_nid_to_free;
225 unsigned long max_huge_pages;
226 unsigned long nr_huge_pages;
227 unsigned long free_huge_pages;
228 unsigned long resv_huge_pages;
229 unsigned long surplus_huge_pages;
230 unsigned long nr_overcommit_huge_pages;
231 struct list_head hugepage_freelists[MAX_NUMNODES];
232 unsigned int nr_huge_pages_node[MAX_NUMNODES];
233 unsigned int free_huge_pages_node[MAX_NUMNODES];
234 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
235 char name[HSTATE_NAME_LEN];
238 struct huge_bootmem_page {
239 struct list_head list;
240 struct hstate *hstate;
243 struct page *alloc_huge_page_node(struct hstate *h, int nid);
246 int __init alloc_bootmem_huge_page(struct hstate *h);
248 void __init hugetlb_add_hstate(unsigned order);
249 struct hstate *size_to_hstate(unsigned long size);
251 #ifndef HUGE_MAX_HSTATE
252 #define HUGE_MAX_HSTATE 1
255 extern struct hstate hstates[HUGE_MAX_HSTATE];
256 extern unsigned int default_hstate_idx;
258 #define default_hstate (hstates[default_hstate_idx])
260 static inline struct hstate *hstate_inode(struct inode *i)
262 struct hugetlbfs_sb_info *hsb;
263 hsb = HUGETLBFS_SB(i->i_sb);
267 static inline struct hstate *hstate_file(struct file *f)
269 return hstate_inode(f->f_dentry->d_inode);
272 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
274 return hstate_file(vma->vm_file);
277 static inline unsigned long huge_page_size(struct hstate *h)
279 return (unsigned long)PAGE_SIZE << h->order;
282 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
284 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
286 static inline unsigned long huge_page_mask(struct hstate *h)
291 static inline unsigned int huge_page_order(struct hstate *h)
296 static inline unsigned huge_page_shift(struct hstate *h)
298 return h->order + PAGE_SHIFT;
301 static inline unsigned int pages_per_huge_page(struct hstate *h)
303 return 1 << h->order;
306 static inline unsigned int blocks_per_huge_page(struct hstate *h)
308 return huge_page_size(h) / 512;
311 #include <asm/hugetlb.h>
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 pgoff_t __basepage_index(struct page *page);
325 /* Return page->index in PAGE_SIZE units */
326 static inline pgoff_t basepage_index(struct page *page)
328 if (!PageCompound(page))
331 return __basepage_index(page);
336 #define alloc_huge_page_node(h, nid) NULL
337 #define alloc_bootmem_huge_page(h) NULL
338 #define hstate_file(f) NULL
339 #define hstate_vma(v) NULL
340 #define hstate_inode(i) NULL
341 #define huge_page_size(h) PAGE_SIZE
342 #define huge_page_mask(h) PAGE_MASK
343 #define vma_kernel_pagesize(v) PAGE_SIZE
344 #define vma_mmu_pagesize(v) PAGE_SIZE
345 #define huge_page_order(h) 0
346 #define huge_page_shift(h) PAGE_SHIFT
347 static inline unsigned int pages_per_huge_page(struct hstate *h)
351 #define hstate_index_to_shift(index) 0
353 static inline pgoff_t basepage_index(struct page *page)
359 #endif /* _LINUX_HUGETLB_H */