tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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 *);
30int hugetlb_report_meminfo(char *);
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()
82#define hugetlb_report_meminfo(buf) 0
83#define hugetlb_report_node_meminfo(n, buf) 0
84#define follow_huge_pmd(mm, addr, pmd, write) NULL
85#define follow_huge_pud(mm, addr, pud, write) NULL
86#define prepare_hugepage_range(file, addr, len) (-EINVAL)
87#define pmd_huge(x) 0
88#define pud_huge(x) 0
89#define is_hugepage_only_range(mm, addr, len) 0
90#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
91#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
92
93#define hugetlb_change_protection(vma, address, end, newprot)
94
95#ifndef HPAGE_MASK
96#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
97#define HPAGE_SIZE PAGE_SIZE
98#endif
99
100#endif /* !CONFIG_HUGETLB_PAGE */
101
102#ifdef CONFIG_HUGETLBFS
103struct hugetlbfs_config {
104 uid_t uid;
105 gid_t gid;
106 umode_t mode;
107 long nr_blocks;
108 long nr_inodes;
109 struct hstate *hstate;
110};
111
112struct hugetlbfs_sb_info {
113 long max_blocks; /* blocks allowed */
114 long free_blocks; /* blocks free */
115 long max_inodes; /* inodes allowed */
116 long free_inodes; /* inodes free */
117 spinlock_t stat_lock;
118 struct hstate *hstate;
119};
120
121
122struct hugetlbfs_inode_info {
123 struct shared_policy policy;
124 struct inode vfs_inode;
125};
126
127static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
128{
129 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
130}
131
132static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
133{
134 return sb->s_fs_info;
135}
136
137extern const struct file_operations hugetlbfs_file_operations;
138extern struct vm_operations_struct hugetlb_vm_ops;
139struct file *hugetlb_file_setup(const char *name, size_t);
140int hugetlb_get_quota(struct address_space *mapping, long delta);
141void hugetlb_put_quota(struct address_space *mapping, long delta);
142
143static inline int is_file_hugepages(struct file *file)
144{
145 if (file->f_op == &hugetlbfs_file_operations)
146 return 1;
147 if (is_file_shm_hugepages(file))
148 return 1;
149
150 return 0;
151}
152
153static inline void set_file_hugepages(struct file *file)
154{
155 file->f_op = &hugetlbfs_file_operations;
156}
157#else /* !CONFIG_HUGETLBFS */
158
159#define is_file_hugepages(file) 0
160#define set_file_hugepages(file) BUG()
161#define hugetlb_file_setup(name,size) ERR_PTR(-ENOSYS)
162
163#endif /* !CONFIG_HUGETLBFS */
164
165#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
166unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
167 unsigned long len, unsigned long pgoff,
168 unsigned long flags);
169#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
170
171#ifdef CONFIG_HUGETLB_PAGE
172
173#define HSTATE_NAME_LEN 32
174/* Defines one hugetlb page size */
175struct hstate {
176 int hugetlb_next_nid;
177 unsigned int order;
178 unsigned long mask;
179 unsigned long max_huge_pages;
180 unsigned long nr_huge_pages;
181 unsigned long free_huge_pages;
182 unsigned long resv_huge_pages;
183 unsigned long surplus_huge_pages;
184 unsigned long nr_overcommit_huge_pages;
185 struct list_head hugepage_freelists[MAX_NUMNODES];
186 unsigned int nr_huge_pages_node[MAX_NUMNODES];
187 unsigned int free_huge_pages_node[MAX_NUMNODES];
188 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
189 char name[HSTATE_NAME_LEN];
190};
191
192struct huge_bootmem_page {
193 struct list_head list;
194 struct hstate *hstate;
195};
196
197/* arch callback */
198int __init alloc_bootmem_huge_page(struct hstate *h);
199
200void __init hugetlb_add_hstate(unsigned order);
201struct hstate *size_to_hstate(unsigned long size);
202
203#ifndef HUGE_MAX_HSTATE
204#define HUGE_MAX_HSTATE 1
205#endif
206
207extern struct hstate hstates[HUGE_MAX_HSTATE];
208extern unsigned int default_hstate_idx;
209
210#define default_hstate (hstates[default_hstate_idx])
211
212static inline struct hstate *hstate_inode(struct inode *i)
213{
214 struct hugetlbfs_sb_info *hsb;
215 hsb = HUGETLBFS_SB(i->i_sb);
216 return hsb->hstate;
217}
218
219static inline struct hstate *hstate_file(struct file *f)
220{
221 return hstate_inode(f->f_dentry->d_inode);
222}
223
224static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
225{
226 return hstate_file(vma->vm_file);
227}
228
229static inline unsigned long huge_page_size(struct hstate *h)
230{
231 return (unsigned long)PAGE_SIZE << h->order;
232}
233
234static inline unsigned long huge_page_mask(struct hstate *h)
235{
236 return h->mask;
237}
238
239static inline unsigned int huge_page_order(struct hstate *h)
240{
241 return h->order;
242}
243
244static inline unsigned huge_page_shift(struct hstate *h)
245{
246 return h->order + PAGE_SHIFT;
247}
248
249static inline unsigned int pages_per_huge_page(struct hstate *h)
250{
251 return 1 << h->order;
252}
253
254static inline unsigned int blocks_per_huge_page(struct hstate *h)
255{
256 return huge_page_size(h) / 512;
257}
258
259#include <asm/hugetlb.h>
260
261static inline struct hstate *page_hstate(struct page *page)
262{
263 return size_to_hstate(PAGE_SIZE << compound_order(page));
264}
265
266#else
267struct hstate {};
268#define alloc_bootmem_huge_page(h) NULL
269#define hstate_file(f) NULL
270#define hstate_vma(v) NULL
271#define hstate_inode(i) NULL
272#define huge_page_size(h) PAGE_SIZE
273#define huge_page_mask(h) PAGE_MASK
274#define huge_page_order(h) 0
275#define huge_page_shift(h) PAGE_SHIFT
276static inline unsigned int pages_per_huge_page(struct hstate *h)
277{
278 return 1;
279}
280#endif
281
282#endif /* _LINUX_HUGETLB_H */