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
14int PageHuge(struct page *page);
15
16static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
17{
18 return vma->vm_flags & VM_HUGETLB;
19}
20
21void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
22int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
23int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
24int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
25int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
26int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
27void unmap_hugepage_range(struct vm_area_struct *,
28 unsigned long, unsigned long, struct page *);
29void __unmap_hugepage_range(struct vm_area_struct *,
30 unsigned long, unsigned long, struct page *);
31int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
32void hugetlb_report_meminfo(struct seq_file *);
33int hugetlb_report_node_meminfo(int, char *);
34unsigned long hugetlb_total_pages(void);
35int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
36 unsigned long address, unsigned int flags);
37int hugetlb_reserve_pages(struct inode *inode, long from, long to,
38 struct vm_area_struct *vma,
39 int acctflags);
40void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
41
42extern unsigned long hugepages_treat_as_movable;
43extern const unsigned long hugetlb_zero, hugetlb_infinity;
44extern int sysctl_hugetlb_shm_group;
45extern struct list_head huge_boot_pages;
46
47/* arch callbacks */
48
49pte_t *huge_pte_alloc(struct mm_struct *mm,
50 unsigned long addr, unsigned long sz);
51pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
52int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
53struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
54 int write);
55struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
56 pmd_t *pmd, int write);
57struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
58 pud_t *pud, int write);
59int pmd_huge(pmd_t pmd);
60int pud_huge(pud_t pmd);
61void hugetlb_change_protection(struct vm_area_struct *vma,
62 unsigned long address, unsigned long end, pgprot_t newprot);
63
64#else /* !CONFIG_HUGETLB_PAGE */
65
66static inline int PageHuge(struct page *page)
67{
68 return 0;
69}
70
71static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
72{
73 return 0;
74}
75
76static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
77{
78}
79
80static inline unsigned long hugetlb_total_pages(void)
81{
82 return 0;
83}
84
85#define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
86#define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
87#define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
88#define hugetlb_prefault(mapping, vma) ({ BUG(); 0; })
89#define unmap_hugepage_range(vma, start, end, page) BUG()
90static inline void hugetlb_report_meminfo(struct seq_file *m)
91{
92}
93#define hugetlb_report_node_meminfo(n, buf) 0
94#define follow_huge_pmd(mm, addr, pmd, write) NULL
95#define follow_huge_pud(mm, addr, pud, write) NULL
96#define prepare_hugepage_range(file, addr, len) (-EINVAL)
97#define pmd_huge(x) 0
98#define pud_huge(x) 0
99#define is_hugepage_only_range(mm, addr, len) 0
100#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
101#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
102
103#define hugetlb_change_protection(vma, address, end, newprot)
104
105#ifndef HPAGE_MASK
106#define HPAGE_MASK PAGE_MASK /* Keep the compiler happy */
107#define HPAGE_SIZE PAGE_SIZE
108#endif
109
110#endif /* !CONFIG_HUGETLB_PAGE */
111
112#ifdef CONFIG_HUGETLBFS
113struct hugetlbfs_config {
114 uid_t uid;
115 gid_t gid;
116 umode_t mode;
117 long nr_blocks;
118 long nr_inodes;
119 struct hstate *hstate;
120};
121
122struct hugetlbfs_sb_info {
123 long max_blocks; /* blocks allowed */
124 long free_blocks; /* blocks free */
125 long max_inodes; /* inodes allowed */
126 long free_inodes; /* inodes free */
127 spinlock_t stat_lock;
128 struct hstate *hstate;
129};
130
131
132struct hugetlbfs_inode_info {
133 struct shared_policy policy;
134 struct inode vfs_inode;
135};
136
137static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
138{
139 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
140}
141
142static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
143{
144 return sb->s_fs_info;
145}
146
147extern const struct file_operations hugetlbfs_file_operations;
148extern struct vm_operations_struct hugetlb_vm_ops;
149struct file *hugetlb_file_setup(const char *name, size_t, int);
150int hugetlb_get_quota(struct address_space *mapping, long delta);
151void hugetlb_put_quota(struct address_space *mapping, long delta);
152
153static inline int is_file_hugepages(struct file *file)
154{
155 if (file->f_op == &hugetlbfs_file_operations)
156 return 1;
157 if (is_file_shm_hugepages(file))
158 return 1;
159
160 return 0;
161}
162
163static inline void set_file_hugepages(struct file *file)
164{
165 file->f_op = &hugetlbfs_file_operations;
166}
167#else /* !CONFIG_HUGETLBFS */
168
169#define is_file_hugepages(file) 0
170#define set_file_hugepages(file) BUG()
171#define hugetlb_file_setup(name,size,acctflag) ERR_PTR(-ENOSYS)
172
173#endif /* !CONFIG_HUGETLBFS */
174
175#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
176unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
177 unsigned long len, unsigned long pgoff,
178 unsigned long flags);
179#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
180
181#ifdef CONFIG_HUGETLB_PAGE
182
183#define HSTATE_NAME_LEN 32
184/* Defines one hugetlb page size */
185struct hstate {
186 int hugetlb_next_nid;
187 unsigned int order;
188 unsigned long mask;
189 unsigned long max_huge_pages;
190 unsigned long nr_huge_pages;
191 unsigned long free_huge_pages;
192 unsigned long resv_huge_pages;
193 unsigned long surplus_huge_pages;
194 unsigned long nr_overcommit_huge_pages;
195 struct list_head hugepage_freelists[MAX_NUMNODES];
196 unsigned int nr_huge_pages_node[MAX_NUMNODES];
197 unsigned int free_huge_pages_node[MAX_NUMNODES];
198 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
199 char name[HSTATE_NAME_LEN];
200};
201
202struct huge_bootmem_page {
203 struct list_head list;
204 struct hstate *hstate;
205};
206
207/* arch callback */
208int __init alloc_bootmem_huge_page(struct hstate *h);
209
210void __init hugetlb_add_hstate(unsigned order);
211struct hstate *size_to_hstate(unsigned long size);
212
213#ifndef HUGE_MAX_HSTATE
214#define HUGE_MAX_HSTATE 1
215#endif
216
217extern struct hstate hstates[HUGE_MAX_HSTATE];
218extern unsigned int default_hstate_idx;
219
220#define default_hstate (hstates[default_hstate_idx])
221
222static inline struct hstate *hstate_inode(struct inode *i)
223{
224 struct hugetlbfs_sb_info *hsb;
225 hsb = HUGETLBFS_SB(i->i_sb);
226 return hsb->hstate;
227}
228
229static inline struct hstate *hstate_file(struct file *f)
230{
231 return hstate_inode(f->f_dentry->d_inode);
232}
233
234static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
235{
236 return hstate_file(vma->vm_file);
237}
238
239static inline unsigned long huge_page_size(struct hstate *h)
240{
241 return (unsigned long)PAGE_SIZE << h->order;
242}
243
244extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
245
246extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
247
248static inline unsigned long huge_page_mask(struct hstate *h)
249{
250 return h->mask;
251}
252
253static inline unsigned int huge_page_order(struct hstate *h)
254{
255 return h->order;
256}
257
258static inline unsigned huge_page_shift(struct hstate *h)
259{
260 return h->order + PAGE_SHIFT;
261}
262
263static inline unsigned int pages_per_huge_page(struct hstate *h)
264{
265 return 1 << h->order;
266}
267
268static inline unsigned int blocks_per_huge_page(struct hstate *h)
269{
270 return huge_page_size(h) / 512;
271}
272
273#include <asm/hugetlb.h>
274
275static inline struct hstate *page_hstate(struct page *page)
276{
277 return size_to_hstate(PAGE_SIZE << compound_order(page));
278}
279
280#else
281struct hstate {};
282#define alloc_bootmem_huge_page(h) NULL
283#define hstate_file(f) NULL
284#define hstate_vma(v) NULL
285#define hstate_inode(i) NULL
286#define huge_page_size(h) PAGE_SIZE
287#define huge_page_mask(h) PAGE_MASK
288#define vma_kernel_pagesize(v) PAGE_SIZE
289#define vma_mmu_pagesize(v) PAGE_SIZE
290#define huge_page_order(h) 0
291#define huge_page_shift(h) PAGE_SHIFT
292static inline unsigned int pages_per_huge_page(struct hstate *h)
293{
294 return 1;
295}
296#endif
297
298#endif /* _LINUX_HUGETLB_H */