xref: /linux-6.15/include/linux/hugetlb.h (revision 3eeebf17)
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 
12 struct ctl_table;
13 
14 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
15 {
16 	return vma->vm_flags & VM_HUGETLB;
17 }
18 
19 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
20 int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
21 int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
22 int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *);
23 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
24 int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int);
25 void unmap_hugepage_range(struct vm_area_struct *,
26 			unsigned long, unsigned long, struct page *);
27 void __unmap_hugepage_range(struct vm_area_struct *,
28 			unsigned long, unsigned long, struct page *);
29 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
30 void hugetlb_report_meminfo(struct seq_file *);
31 int hugetlb_report_node_meminfo(int, char *);
32 unsigned long hugetlb_total_pages(void);
33 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
34 			unsigned long address, int write_access);
35 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
36 						struct vm_area_struct *vma);
37 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
38 
39 extern unsigned long hugepages_treat_as_movable;
40 extern const unsigned long hugetlb_zero, hugetlb_infinity;
41 extern int sysctl_hugetlb_shm_group;
42 extern struct list_head huge_boot_pages;
43 
44 /* arch callbacks */
45 
46 pte_t *huge_pte_alloc(struct mm_struct *mm,
47 			unsigned long addr, unsigned long sz);
48 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
49 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
50 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
51 			      int write);
52 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
53 				pmd_t *pmd, int write);
54 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
55 				pud_t *pud, int write);
56 int pmd_huge(pmd_t pmd);
57 int pud_huge(pud_t pmd);
58 void 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 
63 static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
64 {
65 	return 0;
66 }
67 
68 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
69 {
70 }
71 
72 static 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 static 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
105 struct 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 
114 struct 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 
124 struct hugetlbfs_inode_info {
125 	struct shared_policy policy;
126 	struct inode vfs_inode;
127 };
128 
129 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
130 {
131 	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
132 }
133 
134 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
135 {
136 	return sb->s_fs_info;
137 }
138 
139 extern const struct file_operations hugetlbfs_file_operations;
140 extern struct vm_operations_struct hugetlb_vm_ops;
141 struct file *hugetlb_file_setup(const char *name, size_t);
142 int hugetlb_get_quota(struct address_space *mapping, long delta);
143 void hugetlb_put_quota(struct address_space *mapping, long delta);
144 
145 static 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 
155 static 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
168 unsigned 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 */
177 struct 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 
194 struct huge_bootmem_page {
195 	struct list_head list;
196 	struct hstate *hstate;
197 };
198 
199 /* arch callback */
200 int __init alloc_bootmem_huge_page(struct hstate *h);
201 
202 void __init hugetlb_add_hstate(unsigned order);
203 struct hstate *size_to_hstate(unsigned long size);
204 
205 #ifndef HUGE_MAX_HSTATE
206 #define HUGE_MAX_HSTATE 1
207 #endif
208 
209 extern struct hstate hstates[HUGE_MAX_HSTATE];
210 extern unsigned int default_hstate_idx;
211 
212 #define default_hstate (hstates[default_hstate_idx])
213 
214 static 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 
221 static inline struct hstate *hstate_file(struct file *f)
222 {
223 	return hstate_inode(f->f_dentry->d_inode);
224 }
225 
226 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
227 {
228 	return hstate_file(vma->vm_file);
229 }
230 
231 static inline unsigned long huge_page_size(struct hstate *h)
232 {
233 	return (unsigned long)PAGE_SIZE << h->order;
234 }
235 
236 static inline unsigned long huge_page_mask(struct hstate *h)
237 {
238 	return h->mask;
239 }
240 
241 static inline unsigned int huge_page_order(struct hstate *h)
242 {
243 	return h->order;
244 }
245 
246 static inline unsigned huge_page_shift(struct hstate *h)
247 {
248 	return h->order + PAGE_SHIFT;
249 }
250 
251 static inline unsigned int pages_per_huge_page(struct hstate *h)
252 {
253 	return 1 << h->order;
254 }
255 
256 static 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 
263 static inline struct hstate *page_hstate(struct page *page)
264 {
265 	return size_to_hstate(PAGE_SIZE << compound_order(page));
266 }
267 
268 #else
269 struct 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
278 static inline unsigned int pages_per_huge_page(struct hstate *h)
279 {
280 	return 1;
281 }
282 #endif
283 
284 #endif /* _LINUX_HUGETLB_H */
285