1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
3
4 #include <linux/mm_types.h>
5 #include <linux/fs.h>
6 #include <linux/hugetlb_inline.h>
7
8 struct ctl_table;
9 struct user_struct;
10
11 #ifdef CONFIG_HUGETLB_PAGE
12
13 #include <linux/mempolicy.h>
14 #include <linux/shm.h>
15 #include <asm/tlbflush.h>
16
17 struct hugepage_subpool {
18 spinlock_t lock;
19 long count;
20 long max_hpages, used_hpages;
21 };
22
23 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
24 void hugepage_put_subpool(struct hugepage_subpool *spool);
25
26 int PageHuge(struct page *page);
27
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 *);
32
33 #ifdef CONFIG_NUMA
34 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
35 void __user *, size_t *, loff_t *);
36 #endif
37
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(struct vm_area_struct *,
45 unsigned long, unsigned long, struct page *);
46 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
47 void hugetlb_report_meminfo(struct seq_file *);
48 int hugetlb_report_node_meminfo(int, char *);
49 unsigned long hugetlb_total_pages(void);
50 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
51 unsigned long address, unsigned int flags);
52 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
53 struct vm_area_struct *vma,
54 vm_flags_t vm_flags);
55 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
56 int dequeue_hwpoisoned_huge_page(struct page *page);
57 void copy_huge_page(struct page *dst, struct page *src);
58
59 extern unsigned long hugepages_treat_as_movable;
60 extern const unsigned long hugetlb_zero, hugetlb_infinity;
61 extern int sysctl_hugetlb_shm_group;
62 extern struct list_head huge_boot_pages;
63
64 /* arch callbacks */
65
66 pte_t *huge_pte_alloc(struct mm_struct *mm,
67 unsigned long addr, unsigned long sz);
68 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
69 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
70 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
71 int write);
72 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
73 pmd_t *pmd, int write);
74 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
75 pud_t *pud, int write);
76 int pmd_huge(pmd_t pmd);
77 int pud_huge(pud_t pmd);
78 void hugetlb_change_protection(struct vm_area_struct *vma,
79 unsigned long address, unsigned long end, pgprot_t newprot);
80
81 #else /* !CONFIG_HUGETLB_PAGE */
82
PageHuge(struct page * page)83 static inline int PageHuge(struct page *page)
84 {
85 return 0;
86 }
87
reset_vma_resv_huge_pages(struct vm_area_struct * vma)88 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
89 {
90 }
91
hugetlb_total_pages(void)92 static inline unsigned long hugetlb_total_pages(void)
93 {
94 return 0;
95 }
96
97 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
98 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
99 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
100 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
101 #define unmap_hugepage_range(vma, start, end, page) BUG()
hugetlb_report_meminfo(struct seq_file * m)102 static inline void hugetlb_report_meminfo(struct seq_file *m)
103 {
104 }
105 #define hugetlb_report_node_meminfo(n, buf) 0
106 #define follow_huge_pmd(mm, addr, pmd, write) NULL
107 #define follow_huge_pud(mm, addr, pud, write) NULL
108 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
109 #define pmd_huge(x) 0
110 #define pud_huge(x) 0
111 #define is_hugepage_only_range(mm, addr, len) 0
112 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
113 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
114 #define huge_pte_offset(mm, address) 0
115 #define dequeue_hwpoisoned_huge_page(page) 0
copy_huge_page(struct page * dst,struct page * src)116 static inline void copy_huge_page(struct page *dst, struct page *src)
117 {
118 }
119
120 #define hugetlb_change_protection(vma, address, end, newprot)
121
122 #endif /* !CONFIG_HUGETLB_PAGE */
123
124 #define HUGETLB_ANON_FILE "anon_hugepage"
125
126 enum {
127 /*
128 * The file will be used as an shm file so shmfs accounting rules
129 * apply
130 */
131 HUGETLB_SHMFS_INODE = 1,
132 /*
133 * The file is being created on the internal vfs mount and shmfs
134 * accounting rules do not apply
135 */
136 HUGETLB_ANONHUGE_INODE = 2,
137 };
138
139 #ifdef CONFIG_HUGETLBFS
140 struct hugetlbfs_sb_info {
141 long max_inodes; /* inodes allowed */
142 long free_inodes; /* inodes free */
143 spinlock_t stat_lock;
144 struct hstate *hstate;
145 struct hugepage_subpool *spool;
146 };
147
HUGETLBFS_SB(struct super_block * sb)148 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
149 {
150 return sb->s_fs_info;
151 }
152
153 extern const struct file_operations hugetlbfs_file_operations;
154 extern const struct vm_operations_struct hugetlb_vm_ops;
155 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
156 struct user_struct **user, int creat_flags);
157
is_file_hugepages(struct file * file)158 static inline int is_file_hugepages(struct file *file)
159 {
160 if (file->f_op == &hugetlbfs_file_operations)
161 return 1;
162 if (is_file_shm_hugepages(file))
163 return 1;
164
165 return 0;
166 }
167
168 #else /* !CONFIG_HUGETLBFS */
169
170 #define is_file_hugepages(file) 0
171 static inline struct file *
hugetlb_file_setup(const char * name,size_t size,vm_flags_t acctflag,struct user_struct ** user,int creat_flags)172 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
173 struct user_struct **user, int creat_flags)
174 {
175 return ERR_PTR(-ENOSYS);
176 }
177
178 #endif /* !CONFIG_HUGETLBFS */
179
180 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
181 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
182 unsigned long len, unsigned long pgoff,
183 unsigned long flags);
184 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
185
186 #ifdef CONFIG_HUGETLB_PAGE
187
188 #define HSTATE_NAME_LEN 32
189 /* Defines one hugetlb page size */
190 struct hstate {
191 int next_nid_to_alloc;
192 int next_nid_to_free;
193 unsigned int order;
194 unsigned long mask;
195 unsigned long max_huge_pages;
196 unsigned long nr_huge_pages;
197 unsigned long free_huge_pages;
198 unsigned long resv_huge_pages;
199 unsigned long surplus_huge_pages;
200 unsigned long nr_overcommit_huge_pages;
201 struct list_head hugepage_freelists[MAX_NUMNODES];
202 unsigned int nr_huge_pages_node[MAX_NUMNODES];
203 unsigned int free_huge_pages_node[MAX_NUMNODES];
204 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
205 char name[HSTATE_NAME_LEN];
206 };
207
208 struct huge_bootmem_page {
209 struct list_head list;
210 struct hstate *hstate;
211 #ifdef CONFIG_HIGHMEM
212 phys_addr_t phys;
213 #endif
214 };
215
216 struct page *alloc_huge_page_node(struct hstate *h, int nid);
217
218 /* arch callback */
219 int __init alloc_bootmem_huge_page(struct hstate *h);
220
221 void __init hugetlb_add_hstate(unsigned order);
222 struct hstate *size_to_hstate(unsigned long size);
223
224 #ifndef HUGE_MAX_HSTATE
225 #define HUGE_MAX_HSTATE 1
226 #endif
227
228 extern struct hstate hstates[HUGE_MAX_HSTATE];
229 extern unsigned int default_hstate_idx;
230
231 #define default_hstate (hstates[default_hstate_idx])
232
hstate_inode(struct inode * i)233 static inline struct hstate *hstate_inode(struct inode *i)
234 {
235 struct hugetlbfs_sb_info *hsb;
236 hsb = HUGETLBFS_SB(i->i_sb);
237 return hsb->hstate;
238 }
239
hstate_file(struct file * f)240 static inline struct hstate *hstate_file(struct file *f)
241 {
242 return hstate_inode(f->f_dentry->d_inode);
243 }
244
hstate_vma(struct vm_area_struct * vma)245 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
246 {
247 return hstate_file(vma->vm_file);
248 }
249
huge_page_size(struct hstate * h)250 static inline unsigned long huge_page_size(struct hstate *h)
251 {
252 return (unsigned long)PAGE_SIZE << h->order;
253 }
254
255 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
256
257 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
258
huge_page_mask(struct hstate * h)259 static inline unsigned long huge_page_mask(struct hstate *h)
260 {
261 return h->mask;
262 }
263
huge_page_order(struct hstate * h)264 static inline unsigned int huge_page_order(struct hstate *h)
265 {
266 return h->order;
267 }
268
huge_page_shift(struct hstate * h)269 static inline unsigned huge_page_shift(struct hstate *h)
270 {
271 return h->order + PAGE_SHIFT;
272 }
273
pages_per_huge_page(struct hstate * h)274 static inline unsigned int pages_per_huge_page(struct hstate *h)
275 {
276 return 1 << h->order;
277 }
278
blocks_per_huge_page(struct hstate * h)279 static inline unsigned int blocks_per_huge_page(struct hstate *h)
280 {
281 return huge_page_size(h) / 512;
282 }
283
284 #include <asm/hugetlb.h>
285
page_hstate(struct page * page)286 static inline struct hstate *page_hstate(struct page *page)
287 {
288 return size_to_hstate(PAGE_SIZE << compound_order(page));
289 }
290
hstate_index_to_shift(unsigned index)291 static inline unsigned hstate_index_to_shift(unsigned index)
292 {
293 return hstates[index].order + PAGE_SHIFT;
294 }
295
296 pgoff_t __basepage_index(struct page *page);
297
298 /* Return page->index in PAGE_SIZE units */
basepage_index(struct page * page)299 static inline pgoff_t basepage_index(struct page *page)
300 {
301 if (!PageCompound(page))
302 return page->index;
303
304 return __basepage_index(page);
305 }
306
307 #else /* CONFIG_HUGETLB_PAGE */
308 struct hstate {};
309 #define alloc_huge_page_node(h, nid) NULL
310 #define alloc_bootmem_huge_page(h) NULL
311 #define hstate_file(f) NULL
312 #define hstate_vma(v) NULL
313 #define hstate_inode(i) NULL
314 #define huge_page_size(h) PAGE_SIZE
315 #define huge_page_mask(h) PAGE_MASK
316 #define vma_kernel_pagesize(v) PAGE_SIZE
317 #define vma_mmu_pagesize(v) PAGE_SIZE
318 #define huge_page_order(h) 0
319 #define huge_page_shift(h) PAGE_SHIFT
pages_per_huge_page(struct hstate * h)320 static inline unsigned int pages_per_huge_page(struct hstate *h)
321 {
322 return 1;
323 }
324 #define hstate_index_to_shift(index) 0
325
basepage_index(struct page * page)326 static inline pgoff_t basepage_index(struct page *page)
327 {
328 return page->index;
329 }
330 #endif
331
332 #endif /* _LINUX_HUGETLB_H */
333