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
6struct ctl_table;
7struct user_struct;
8
9#ifdef CONFIG_HUGETLB_PAGE
10
11#include <linux/mempolicy.h>
12#include <linux/shm.h>
13#include <asm/tlbflush.h>
14
15int PageHuge(struct page *page);
16
17static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
18{
19 return vma->vm_flags & VM_HUGETLB;
20}
21
22void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
23int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
24int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
25int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
26
27#ifdef CONFIG_NUMA
28int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
29 void __user *, size_t *, loff_t *);
30#endif
31
32int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
33int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
34 struct page **, struct vm_area_struct **,
35 unsigned long *, int *, int, unsigned int flags);
36void unmap_hugepage_range(struct vm_area_struct *,
37 unsigned long, unsigned long, struct page *);
38void __unmap_hugepage_range(struct vm_area_struct *,
39 unsigned long, unsigned long, struct page *);
40int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
41void hugetlb_report_meminfo(struct seq_file *);
42int hugetlb_report_node_meminfo(int, char *);
43unsigned long hugetlb_total_pages(void);
44int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
45 unsigned long address, unsigned int flags);
46int hugetlb_reserve_pages(struct inode *inode, long from, long to,
47 struct vm_area_struct *vma,
48 int acctflags);
49void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
50
51extern unsigned long hugepages_treat_as_movable;
52extern const unsigned long hugetlb_zero, hugetlb_infinity;
53extern int sysctl_hugetlb_shm_group;
54extern struct list_head huge_boot_pages;
55
56/* arch callbacks */
57
58pte_t *huge_pte_alloc(struct mm_struct *mm,
59 unsigned long addr, unsigned long sz);
60pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
61int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
62struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
63 int write);
64struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
65 pmd_t *pmd, int write);
66struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
67 pud_t *pud, int write);
68int pmd_huge(pmd_t pmd);
69int pud_huge(pud_t pmd);
70void hugetlb_change_protection(struct vm_area_struct *vma,
71 unsigned long address, unsigned long end, pgprot_t newprot);
72
73#else /* !CONFIG_HUGETLB_PAGE */
74
75static inline int PageHuge(struct page *page)
76{
77 return 0;
78}
79
80static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
81{
82 return 0;
83}
84
85static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
86{
87}
88
89static inline unsigned long hugetlb_total_pages(void)
90{
91 return 0;
92}
93
94#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
95#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
96#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
97#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
98#define unmap_hugepage_range(vma, start, end, page) BUG()
99static inline void hugetlb_report_meminfo(struct seq_file *m)
100{
101}
102#define hugetlb_report_node_meminfo(n, buf) 0
103#define follow_huge_pmd(mm, addr, pmd, write) NULL
104#define follow_huge_pud(mm, addr, pud, write) NULL
105#define prepare_hugepage_range(file, addr, len) (-EINVAL)
106#define pmd_huge(x) 0
107#define pud_huge(x) 0
108#define is_hugepage_only_range(mm, addr, len) 0
109#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
110#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
111
112#define hugetlb_change_protection(vma, address, end, newprot)
113
114#ifndef HPAGE_MASK
115#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
116#define HPAGE_SIZE PAGE_SIZE
117#endif
118
119#endif /* !CONFIG_HUGETLB_PAGE */
120
121#define HUGETLB_ANON_FILE "anon_hugepage"
122
123enum {
124 /*
125 * The file will be used as an shm file so shmfs accounting rules
126 * apply
127 */
128 HUGETLB_SHMFS_INODE = 1,
129 /*
130 * The file is being created on the internal vfs mount and shmfs
131 * accounting rules do not apply
132 */
133 HUGETLB_ANONHUGE_INODE = 2,
134};
135
136#ifdef CONFIG_HUGETLBFS
137struct hugetlbfs_config {
138 uid_t uid;
139 gid_t gid;
140 umode_t mode;
141 long nr_blocks;
142 long nr_inodes;
143 struct hstate *hstate;
144};
145
146struct hugetlbfs_sb_info {
147 long max_blocks; /* blocks allowed */
148 long free_blocks; /* blocks free */
149 long max_inodes; /* inodes allowed */
150 long free_inodes; /* inodes free */
151 spinlock_t stat_lock;
152 struct hstate *hstate;
153};
154
155
156struct hugetlbfs_inode_info {
157 struct shared_policy policy;
158 struct inode vfs_inode;
159};
160
161static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
162{
163 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
164}
165
166static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
167{
168 return sb->s_fs_info;
169}
170
171extern const struct file_operations hugetlbfs_file_operations;
172extern const struct vm_operations_struct hugetlb_vm_ops;
173struct file *hugetlb_file_setup(const char *name, size_t size, int acct,
174 struct user_struct **user, int creat_flags);
175int hugetlb_get_quota(struct address_space *mapping, long delta);
176void hugetlb_put_quota(struct address_space *mapping, long delta);
177
178static inline int is_file_hugepages(struct file *file)
179{
180 if (file->f_op == &hugetlbfs_file_operations)
181 return 1;
182 if (is_file_shm_hugepages(file))
183 return 1;
184
185 return 0;
186}
187
188static inline void set_file_hugepages(struct file *file)
189{
190 file->f_op = &hugetlbfs_file_operations;
191}
192#else /* !CONFIG_HUGETLBFS */
193
194#define is_file_hugepages(file) 0
195#define set_file_hugepages(file) BUG()
196static inline struct file *hugetlb_file_setup(const char *name, size_t size,
197 int acctflag, struct user_struct **user, int creat_flags)
198{
199 return ERR_PTR(-ENOSYS);
200}
201
202#endif /* !CONFIG_HUGETLBFS */
203
204#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
205unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
206 unsigned long len, unsigned long pgoff,
207 unsigned long flags);
208#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
209
210#ifdef CONFIG_HUGETLB_PAGE
211
212#define HSTATE_NAME_LEN 32
213/* Defines one hugetlb page size */
214struct hstate {
215 int next_nid_to_alloc;
216 int next_nid_to_free;
217 unsigned int order;
218 unsigned long mask;
219 unsigned long max_huge_pages;
220 unsigned long nr_huge_pages;
221 unsigned long free_huge_pages;
222 unsigned long resv_huge_pages;
223 unsigned long surplus_huge_pages;
224 unsigned long nr_overcommit_huge_pages;
225 struct list_head hugepage_freelists[MAX_NUMNODES];
226 unsigned int nr_huge_pages_node[MAX_NUMNODES];
227 unsigned int free_huge_pages_node[MAX_NUMNODES];
228 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
229 char name[HSTATE_NAME_LEN];
230};
231
232struct huge_bootmem_page {
233 struct list_head list;
234 struct hstate *hstate;
235};
236
237/* arch callback */
238int __init alloc_bootmem_huge_page(struct hstate *h);
239
240void __init hugetlb_add_hstate(unsigned order);
241struct hstate *size_to_hstate(unsigned long size);
242
243#ifndef HUGE_MAX_HSTATE
244#define HUGE_MAX_HSTATE 1
245#endif
246
247extern struct hstate hstates[HUGE_MAX_HSTATE];
248extern unsigned int default_hstate_idx;
249
250#define default_hstate (hstates[default_hstate_idx])
251
252static inline struct hstate *hstate_inode(struct inode *i)
253{
254 struct hugetlbfs_sb_info *hsb;
255 hsb = HUGETLBFS_SB(i->i_sb);
256 return hsb->hstate;
257}
258
259static inline struct hstate *hstate_file(struct file *f)
260{
261 return hstate_inode(f->f_dentry->d_inode);
262}
263
264static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
265{
266 return hstate_file(vma->vm_file);
267}
268
269static inline unsigned long huge_page_size(struct hstate *h)
270{
271 return (unsigned long)PAGE_SIZE << h->order;
272}
273
274extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
275
276extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
277
278static inline unsigned long huge_page_mask(struct hstate *h)
279{
280 return h->mask;
281}
282
283static inline unsigned int huge_page_order(struct hstate *h)
284{
285 return h->order;
286}
287
288static inline unsigned huge_page_shift(struct hstate *h)
289{
290 return h->order + PAGE_SHIFT;
291}
292
293static inline unsigned int pages_per_huge_page(struct hstate *h)
294{
295 return 1 << h->order;
296}
297
298static inline unsigned int blocks_per_huge_page(struct hstate *h)
299{
300 return huge_page_size(h) / 512;
301}
302
303#include <asm/hugetlb.h>
304
305static inline struct hstate *page_hstate(struct page *page)
306{
307 return size_to_hstate(PAGE_SIZE << compound_order(page));
308}
309
310#else
311struct hstate {};
312#define alloc_bootmem_huge_page(h) NULL
313#define hstate_file(f) NULL
314#define hstate_vma(v) NULL
315#define hstate_inode(i) NULL
316#define huge_page_size(h) PAGE_SIZE
317#define huge_page_mask(h) PAGE_MASK
318#define vma_kernel_pagesize(v) PAGE_SIZE
319#define vma_mmu_pagesize(v) PAGE_SIZE
320#define huge_page_order(h) 0
321#define huge_page_shift(h) PAGE_SHIFT
322static inline unsigned int pages_per_huge_page(struct hstate *h)
323{
324 return 1;
325}
326#endif
327
328#endif /* _LINUX_HUGETLB_H */