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 *);
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,
37 int acctflags);
38void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
39
40extern unsigned long hugepages_treat_as_movable;
41extern const unsigned long hugetlb_zero, hugetlb_infinity;
42extern int sysctl_hugetlb_shm_group;
43extern struct list_head huge_boot_pages;
44
45/* arch callbacks */
46
47pte_t *huge_pte_alloc(struct mm_struct *mm,
48 unsigned long addr, unsigned long sz);
49pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
50int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
51struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
52 int write);
53struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
54 pmd_t *pmd, int write);
55struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
56 pud_t *pud, int write);
57int pmd_huge(pmd_t pmd);
58int pud_huge(pud_t pmd);
59void 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
64static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
65{
66 return 0;
67}
68
69static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
70{
71}
72
73static 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()
83static 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
106struct 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
115struct 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
125struct hugetlbfs_inode_info {
126 struct shared_policy policy;
127 struct inode vfs_inode;
128};
129
130static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
131{
132 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
133}
134
135static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
136{
137 return sb->s_fs_info;
138}
139
140extern const struct file_operations hugetlbfs_file_operations;
141extern struct vm_operations_struct hugetlb_vm_ops;
142struct file *hugetlb_file_setup(const char *name, size_t, int);
143int hugetlb_get_quota(struct address_space *mapping, long delta);
144void hugetlb_put_quota(struct address_space *mapping, long delta);
145
146static 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
156static 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
169unsigned 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 */
178struct 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
195struct huge_bootmem_page {
196 struct list_head list;
197 struct hstate *hstate;
198};
199
200/* arch callback */
201int __init alloc_bootmem_huge_page(struct hstate *h);
202
203void __init hugetlb_add_hstate(unsigned order);
204struct hstate *size_to_hstate(unsigned long size);
205
206#ifndef HUGE_MAX_HSTATE
207#define HUGE_MAX_HSTATE 1
208#endif
209
210extern struct hstate hstates[HUGE_MAX_HSTATE];
211extern unsigned int default_hstate_idx;
212
213#define default_hstate (hstates[default_hstate_idx])
214
215static 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
222static inline struct hstate *hstate_file(struct file *f)
223{
224 return hstate_inode(f->f_dentry->d_inode);
225}
226
227static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
228{
229 return hstate_file(vma->vm_file);
230}
231
232static inline unsigned long huge_page_size(struct hstate *h)
233{
234 return (unsigned long)PAGE_SIZE << h->order;
235}
236
237extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
238
239extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
240
241static inline unsigned long huge_page_mask(struct hstate *h)
242{
243 return h->mask;
244}
245
246static inline unsigned int huge_page_order(struct hstate *h)
247{
248 return h->order;
249}
250
251static inline unsigned huge_page_shift(struct hstate *h)
252{
253 return h->order + PAGE_SHIFT;
254}
255
256static inline unsigned int pages_per_huge_page(struct hstate *h)
257{
258 return 1 << h->order;
259}
260
261static 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
268static inline struct hstate *page_hstate(struct page *page)
269{
270 return size_to_hstate(PAGE_SIZE << compound_order(page));
271}
272
273#else
274struct 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
285static inline unsigned int pages_per_huge_page(struct hstate *h)
286{
287 return 1;
288}
289#endif
290
291#endif /* _LINUX_HUGETLB_H */