1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
3
4 #include <linux/fs.h>
5
6 #ifdef CONFIG_HUGETLB_PAGE
7
8 #include <linux/mempolicy.h>
9 #include <linux/shm.h>
10 #include <asm/tlbflush.h>
11
12 struct ctl_table;
13
is_vm_hugetlb_page(struct vm_area_struct * vma)14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
15 {
16 return vma->vm_flags & VM_HUGETLB;
17 }
18
19 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
20 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
21 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
22 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
23 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
24 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
25 void unmap_hugepage_range(struct vm_area_struct *,
26 unsigned long, unsigned long, struct page *);
27 void __unmap_hugepage_range(struct vm_area_struct *,
28 unsigned long, unsigned long, struct page *);
29 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
30 void hugetlb_report_meminfo(struct seq_file *);
31 int hugetlb_report_node_meminfo(int, char *);
32 unsigned long hugetlb_total_pages(void);
33 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
34 unsigned long address, int write_access);
35 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
36 struct vm_area_struct *vma,
37 int acctflags);
38 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
39
40 extern unsigned long hugepages_treat_as_movable;
41 extern const unsigned long hugetlb_zero, hugetlb_infinity;
42 extern int sysctl_hugetlb_shm_group;
43 extern struct list_head huge_boot_pages;
44
45 /* arch callbacks */
46
47 pte_t *huge_pte_alloc(struct mm_struct *mm,
48 unsigned long addr, unsigned long sz);
49 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
50 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
51 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
52 int write);
53 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
54 pmd_t *pmd, int write);
55 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
56 pud_t *pud, int write);
57 int pmd_huge(pmd_t pmd);
58 int pud_huge(pud_t pmd);
59 void hugetlb_change_protection(struct vm_area_struct *vma,
60 unsigned long address, unsigned long end, pgprot_t newprot);
61
62 #else /* !CONFIG_HUGETLB_PAGE */
63
is_vm_hugetlb_page(struct vm_area_struct * vma)64 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
65 {
66 return 0;
67 }
68
reset_vma_resv_huge_pages(struct vm_area_struct * vma)69 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
70 {
71 }
72
hugetlb_total_pages(void)73 static inline unsigned long hugetlb_total_pages(void)
74 {
75 return 0;
76 }
77
78 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
79 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
80 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
81 #define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
82 #define unmap_hugepage_range(vma, start, end, page) BUG()
hugetlb_report_meminfo(struct seq_file * m)83 static inline void hugetlb_report_meminfo(struct seq_file *m)
84 {
85 }
86 #define hugetlb_report_node_meminfo(n, buf) 0
87 #define follow_huge_pmd(mm, addr, pmd, write) NULL
88 #define follow_huge_pud(mm, addr, pud, write) NULL
89 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
90 #define pmd_huge(x) 0
91 #define pud_huge(x) 0
92 #define is_hugepage_only_range(mm, addr, len) 0
93 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
94 #define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
95
96 #define hugetlb_change_protection(vma, address, end, newprot)
97
98 #ifndef HPAGE_MASK
99 #define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
100 #define HPAGE_SIZE PAGE_SIZE
101 #endif
102
103 #endif /* !CONFIG_HUGETLB_PAGE */
104
105 #ifdef CONFIG_HUGETLBFS
106 struct hugetlbfs_config {
107 uid_t uid;
108 gid_t gid;
109 umode_t mode;
110 long nr_blocks;
111 long nr_inodes;
112 struct hstate *hstate;
113 };
114
115 struct hugetlbfs_sb_info {
116 long max_blocks; /* blocks allowed */
117 long free_blocks; /* blocks free */
118 long max_inodes; /* inodes allowed */
119 long free_inodes; /* inodes free */
120 spinlock_t stat_lock;
121 struct hstate *hstate;
122 };
123
124
125 struct hugetlbfs_inode_info {
126 struct shared_policy policy;
127 struct inode vfs_inode;
128 };
129
HUGETLBFS_I(struct inode * inode)130 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
131 {
132 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
133 }
134
HUGETLBFS_SB(struct super_block * sb)135 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
136 {
137 return sb->s_fs_info;
138 }
139
140 extern const struct file_operations hugetlbfs_file_operations;
141 extern struct vm_operations_struct hugetlb_vm_ops;
142 struct file *hugetlb_file_setup(const char *name, size_t, int);
143 int hugetlb_get_quota(struct address_space *mapping, long delta);
144 void hugetlb_put_quota(struct address_space *mapping, long delta);
145
is_file_hugepages(struct file * file)146 static inline int is_file_hugepages(struct file *file)
147 {
148 if (file->f_op == &hugetlbfs_file_operations)
149 return 1;
150 if (is_file_shm_hugepages(file))
151 return 1;
152
153 return 0;
154 }
155
set_file_hugepages(struct file * file)156 static inline void set_file_hugepages(struct file *file)
157 {
158 file->f_op = &hugetlbfs_file_operations;
159 }
160 #else /* !CONFIG_HUGETLBFS */
161
162 #define is_file_hugepages(file) 0
163 #define set_file_hugepages(file) BUG()
164 #define hugetlb_file_setup(name,size,acctflag) ERR_PTR(-ENOSYS)
165
166 #endif /* !CONFIG_HUGETLBFS */
167
168 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
169 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
170 unsigned long len, unsigned long pgoff,
171 unsigned long flags);
172 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
173
174 #ifdef CONFIG_HUGETLB_PAGE
175
176 #define HSTATE_NAME_LEN 32
177 /* Defines one hugetlb page size */
178 struct hstate {
179 int hugetlb_next_nid;
180 unsigned int order;
181 unsigned long mask;
182 unsigned long max_huge_pages;
183 unsigned long nr_huge_pages;
184 unsigned long free_huge_pages;
185 unsigned long resv_huge_pages;
186 unsigned long surplus_huge_pages;
187 unsigned long nr_overcommit_huge_pages;
188 struct list_head hugepage_freelists[MAX_NUMNODES];
189 unsigned int nr_huge_pages_node[MAX_NUMNODES];
190 unsigned int free_huge_pages_node[MAX_NUMNODES];
191 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
192 char name[HSTATE_NAME_LEN];
193 };
194
195 struct huge_bootmem_page {
196 struct list_head list;
197 struct hstate *hstate;
198 };
199
200 /* arch callback */
201 int __init alloc_bootmem_huge_page(struct hstate *h);
202
203 void __init hugetlb_add_hstate(unsigned order);
204 struct hstate *size_to_hstate(unsigned long size);
205
206 #ifndef HUGE_MAX_HSTATE
207 #define HUGE_MAX_HSTATE 1
208 #endif
209
210 extern struct hstate hstates[HUGE_MAX_HSTATE];
211 extern unsigned int default_hstate_idx;
212
213 #define default_hstate (hstates[default_hstate_idx])
214
hstate_inode(struct inode * i)215 static inline struct hstate *hstate_inode(struct inode *i)
216 {
217 struct hugetlbfs_sb_info *hsb;
218 hsb = HUGETLBFS_SB(i->i_sb);
219 return hsb->hstate;
220 }
221
hstate_file(struct file * f)222 static inline struct hstate *hstate_file(struct file *f)
223 {
224 return hstate_inode(f->f_dentry->d_inode);
225 }
226
hstate_vma(struct vm_area_struct * vma)227 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
228 {
229 return hstate_file(vma->vm_file);
230 }
231
huge_page_size(struct hstate * h)232 static inline unsigned long huge_page_size(struct hstate *h)
233 {
234 return (unsigned long)PAGE_SIZE << h->order;
235 }
236
237 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
238
239 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
240
huge_page_mask(struct hstate * h)241 static inline unsigned long huge_page_mask(struct hstate *h)
242 {
243 return h->mask;
244 }
245
huge_page_order(struct hstate * h)246 static inline unsigned int huge_page_order(struct hstate *h)
247 {
248 return h->order;
249 }
250
huge_page_shift(struct hstate * h)251 static inline unsigned huge_page_shift(struct hstate *h)
252 {
253 return h->order + PAGE_SHIFT;
254 }
255
pages_per_huge_page(struct hstate * h)256 static inline unsigned int pages_per_huge_page(struct hstate *h)
257 {
258 return 1 << h->order;
259 }
260
blocks_per_huge_page(struct hstate * h)261 static inline unsigned int blocks_per_huge_page(struct hstate *h)
262 {
263 return huge_page_size(h) / 512;
264 }
265
266 #include <asm/hugetlb.h>
267
page_hstate(struct page * page)268 static inline struct hstate *page_hstate(struct page *page)
269 {
270 return size_to_hstate(PAGE_SIZE << compound_order(page));
271 }
272
273 #else
274 struct hstate {};
275 #define alloc_bootmem_huge_page(h) NULL
276 #define hstate_file(f) NULL
277 #define hstate_vma(v) NULL
278 #define hstate_inode(i) NULL
279 #define huge_page_size(h) PAGE_SIZE
280 #define huge_page_mask(h) PAGE_MASK
281 #define vma_kernel_pagesize(v) PAGE_SIZE
282 #define vma_mmu_pagesize(v) PAGE_SIZE
283 #define huge_page_order(h) 0
284 #define huge_page_shift(h) PAGE_SHIFT
pages_per_huge_page(struct hstate * h)285 static inline unsigned int pages_per_huge_page(struct hstate *h)
286 {
287 return 1;
288 }
289 #endif
290
291 #endif /* _LINUX_HUGETLB_H */
292