1#ifndef _LINUX_HUGETLB_H
2#define _LINUX_HUGETLB_H
3
4#include <linux/mm_types.h>
5#include <linux/fs.h>
6#include <linux/hugetlb_inline.h>
7
8struct ctl_table;
9struct user_struct;
10
11#ifdef CONFIG_HUGETLB_PAGE
12
13#include <linux/mempolicy.h>
14#include <linux/shm.h>
15#include <asm/tlbflush.h>
16
17struct hugepage_subpool {
18	spinlock_t lock;
19	long count;
20	long max_hpages, used_hpages;
21};
22
23struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
24void hugepage_put_subpool(struct hugepage_subpool *spool);
25
26int PageHuge(struct page *page);
27
28void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
29int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
30int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
31int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
32
33#ifdef CONFIG_NUMA
34int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
35					void __user *, size_t *, loff_t *);
36#endif
37
38int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
39int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
40			struct page **, struct vm_area_struct **,
41			unsigned long *, int *, int, unsigned int flags);
42void unmap_hugepage_range(struct vm_area_struct *,
43			unsigned long, unsigned long, struct page *);
44void __unmap_hugepage_range(struct vm_area_struct *,
45			unsigned long, unsigned long, struct page *);
46int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
47void hugetlb_report_meminfo(struct seq_file *);
48int hugetlb_report_node_meminfo(int, char *);
49unsigned long hugetlb_total_pages(void);
50int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
51			unsigned long address, unsigned int flags);
52int hugetlb_reserve_pages(struct inode *inode, long from, long to,
53						struct vm_area_struct *vma,
54						vm_flags_t vm_flags);
55void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
56int dequeue_hwpoisoned_huge_page(struct page *page);
57void copy_huge_page(struct page *dst, struct page *src);
58
59extern unsigned long hugepages_treat_as_movable;
60extern const unsigned long hugetlb_zero, hugetlb_infinity;
61extern int sysctl_hugetlb_shm_group;
62extern struct list_head huge_boot_pages;
63
64/* arch callbacks */
65
66pte_t *huge_pte_alloc(struct mm_struct *mm,
67			unsigned long addr, unsigned long sz);
68pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
69int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
70struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
71			      int write);
72struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
73				pmd_t *pmd, int write);
74struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
75				pud_t *pud, int write);
76int pmd_huge(pmd_t pmd);
77int pud_huge(pud_t pmd);
78void hugetlb_change_protection(struct vm_area_struct *vma,
79		unsigned long address, unsigned long end, pgprot_t newprot);
80
81#else /* !CONFIG_HUGETLB_PAGE */
82
83static inline int PageHuge(struct page *page)
84{
85	return 0;
86}
87
88static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
89{
90}
91
92static inline unsigned long hugetlb_total_pages(void)
93{
94	return 0;
95}
96
97#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
98#define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
99#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
100#define hugetlb_prefault(mapping, vma)		({ BUG(); 0; })
101#define unmap_hugepage_range(vma, start, end, page)	BUG()
102static inline void hugetlb_report_meminfo(struct seq_file *m)
103{
104}
105#define hugetlb_report_node_meminfo(n, buf)	0
106#define follow_huge_pmd(mm, addr, pmd, write)	NULL
107#define follow_huge_pud(mm, addr, pud, write)	NULL
108#define prepare_hugepage_range(file, addr, len)	(-EINVAL)
109#define pmd_huge(x)	0
110#define pud_huge(x)	0
111#define is_hugepage_only_range(mm, addr, len)	0
112#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
113#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
114#define huge_pte_offset(mm, address)	0
115#define dequeue_hwpoisoned_huge_page(page)	0
116static inline void copy_huge_page(struct page *dst, struct page *src)
117{
118}
119
120#define hugetlb_change_protection(vma, address, end, newprot)
121
122#endif /* !CONFIG_HUGETLB_PAGE */
123
124#define HUGETLB_ANON_FILE "anon_hugepage"
125
126enum {
127	/*
128	 * The file will be used as an shm file so shmfs accounting rules
129	 * apply
130	 */
131	HUGETLB_SHMFS_INODE     = 1,
132	/*
133	 * The file is being created on the internal vfs mount and shmfs
134	 * accounting rules do not apply
135	 */
136	HUGETLB_ANONHUGE_INODE  = 2,
137};
138
139#ifdef CONFIG_HUGETLBFS
140struct hugetlbfs_sb_info {
141	long	max_inodes;   /* inodes allowed */
142	long	free_inodes;  /* inodes free */
143	spinlock_t	stat_lock;
144	struct hstate *hstate;
145	struct hugepage_subpool *spool;
146};
147
148static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
149{
150	return sb->s_fs_info;
151}
152
153extern const struct file_operations hugetlbfs_file_operations;
154extern const struct vm_operations_struct hugetlb_vm_ops;
155struct file *hugetlb_file_setup(const char *name, unsigned long addr,
156				size_t size, vm_flags_t acct,
157				struct user_struct **user, int creat_flags);
158
159static inline int is_file_hugepages(struct file *file)
160{
161	if (file->f_op == &hugetlbfs_file_operations)
162		return 1;
163	if (is_file_shm_hugepages(file))
164		return 1;
165
166	return 0;
167}
168
169#else /* !CONFIG_HUGETLBFS */
170
171#define is_file_hugepages(file)			0
172static inline struct file *
173hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
174		vm_flags_t acctflag, struct user_struct **user, int creat_flags)
175{
176	return ERR_PTR(-ENOSYS);
177}
178
179#endif /* !CONFIG_HUGETLBFS */
180
181#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
182unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
183					unsigned long len, unsigned long pgoff,
184					unsigned long flags);
185#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
186
187#ifdef CONFIG_HUGETLB_PAGE
188
189#define HSTATE_NAME_LEN 32
190/* Defines one hugetlb page size */
191struct hstate {
192	int next_nid_to_alloc;
193	int next_nid_to_free;
194	unsigned int order;
195	unsigned long mask;
196	unsigned long max_huge_pages;
197	unsigned long nr_huge_pages;
198	unsigned long free_huge_pages;
199	unsigned long resv_huge_pages;
200	unsigned long surplus_huge_pages;
201	unsigned long nr_overcommit_huge_pages;
202	struct list_head hugepage_freelists[MAX_NUMNODES];
203	unsigned int nr_huge_pages_node[MAX_NUMNODES];
204	unsigned int free_huge_pages_node[MAX_NUMNODES];
205	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
206	char name[HSTATE_NAME_LEN];
207};
208
209struct huge_bootmem_page {
210	struct list_head list;
211	struct hstate *hstate;
212#ifdef CONFIG_HIGHMEM
213	phys_addr_t phys;
214#endif
215};
216
217struct page *alloc_huge_page_node(struct hstate *h, int nid);
218
219/* arch callback */
220int __init alloc_bootmem_huge_page(struct hstate *h);
221
222void __init hugetlb_add_hstate(unsigned order);
223struct hstate *size_to_hstate(unsigned long size);
224
225#ifndef HUGE_MAX_HSTATE
226#define HUGE_MAX_HSTATE 1
227#endif
228
229extern struct hstate hstates[HUGE_MAX_HSTATE];
230extern unsigned int default_hstate_idx;
231
232#define default_hstate (hstates[default_hstate_idx])
233
234static inline struct hstate *hstate_inode(struct inode *i)
235{
236	struct hugetlbfs_sb_info *hsb;
237	hsb = HUGETLBFS_SB(i->i_sb);
238	return hsb->hstate;
239}
240
241static inline struct hstate *hstate_file(struct file *f)
242{
243	return hstate_inode(f->f_dentry->d_inode);
244}
245
246static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
247{
248	return hstate_file(vma->vm_file);
249}
250
251static inline unsigned long huge_page_size(struct hstate *h)
252{
253	return (unsigned long)PAGE_SIZE << h->order;
254}
255
256extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
257
258extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
259
260static inline unsigned long huge_page_mask(struct hstate *h)
261{
262	return h->mask;
263}
264
265static inline unsigned int huge_page_order(struct hstate *h)
266{
267	return h->order;
268}
269
270static inline unsigned huge_page_shift(struct hstate *h)
271{
272	return h->order + PAGE_SHIFT;
273}
274
275static inline unsigned int pages_per_huge_page(struct hstate *h)
276{
277	return 1 << h->order;
278}
279
280static inline unsigned int blocks_per_huge_page(struct hstate *h)
281{
282	return huge_page_size(h) / 512;
283}
284
285#include <asm/hugetlb.h>
286
287static inline struct hstate *page_hstate(struct page *page)
288{
289	return size_to_hstate(PAGE_SIZE << compound_order(page));
290}
291
292static inline unsigned hstate_index_to_shift(unsigned index)
293{
294	return hstates[index].order + PAGE_SHIFT;
295}
296
297#else
298struct hstate {};
299#define alloc_huge_page_node(h, nid) NULL
300#define alloc_bootmem_huge_page(h) NULL
301#define hstate_file(f) NULL
302#define hstate_vma(v) NULL
303#define hstate_inode(i) NULL
304#define huge_page_size(h) PAGE_SIZE
305#define huge_page_mask(h) PAGE_MASK
306#define vma_kernel_pagesize(v) PAGE_SIZE
307#define vma_mmu_pagesize(v) PAGE_SIZE
308#define huge_page_order(h) 0
309#define huge_page_shift(h) PAGE_SHIFT
310static inline unsigned int pages_per_huge_page(struct hstate *h)
311{
312	return 1;
313}
314#define hstate_index_to_shift(index) 0
315#endif
316
317#endif /* _LINUX_HUGETLB_H */
318