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