1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #include <linux/mm_types.h>
6 #include <linux/hugetlb_inline.h>
7 #include <linux/cgroup.h>
13 #ifdef CONFIG_HUGETLB_PAGE
15 #include <linux/mempolicy.h>
16 #include <linux/shm.h>
17 #include <asm/tlbflush.h>
19 struct hugepage_subpool
{
22 long max_hpages
, used_hpages
;
25 extern spinlock_t hugetlb_lock
;
26 extern int hugetlb_max_hstate __read_mostly
;
27 #define for_each_hstate(h) \
28 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
30 struct hugepage_subpool
*hugepage_new_subpool(long nr_blocks
);
31 void hugepage_put_subpool(struct hugepage_subpool
*spool
);
33 int PageHuge(struct page
*page
);
35 void reset_vma_resv_huge_pages(struct vm_area_struct
*vma
);
36 int hugetlb_sysctl_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
37 int hugetlb_overcommit_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
38 int hugetlb_treat_movable_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
41 int hugetlb_mempolicy_sysctl_handler(struct ctl_table
*, int,
42 void __user
*, size_t *, loff_t
*);
45 int copy_hugetlb_page_range(struct mm_struct
*, struct mm_struct
*, struct vm_area_struct
*);
46 long follow_hugetlb_page(struct mm_struct
*, struct vm_area_struct
*,
47 struct page
**, struct vm_area_struct
**,
48 unsigned long *, unsigned long *, long, unsigned int);
49 void unmap_hugepage_range(struct vm_area_struct
*,
50 unsigned long, unsigned long, struct page
*);
51 void __unmap_hugepage_range_final(struct mmu_gather
*tlb
,
52 struct vm_area_struct
*vma
,
53 unsigned long start
, unsigned long end
,
54 struct page
*ref_page
);
55 void __unmap_hugepage_range(struct mmu_gather
*tlb
, struct vm_area_struct
*vma
,
56 unsigned long start
, unsigned long end
,
57 struct page
*ref_page
);
58 void hugetlb_report_meminfo(struct seq_file
*);
59 int hugetlb_report_node_meminfo(int, char *);
60 void hugetlb_show_meminfo(void);
61 unsigned long hugetlb_total_pages(void);
62 int hugetlb_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
63 unsigned long address
, unsigned int flags
);
64 int hugetlb_reserve_pages(struct inode
*inode
, long from
, long to
,
65 struct vm_area_struct
*vma
,
67 void hugetlb_unreserve_pages(struct inode
*inode
, long offset
, long freed
);
68 int dequeue_hwpoisoned_huge_page(struct page
*page
);
69 bool isolate_huge_page(struct page
*page
, struct list_head
*list
);
70 void putback_active_hugepage(struct page
*page
);
71 bool is_hugepage_active(struct page
*page
);
72 void copy_huge_page(struct page
*dst
, struct page
*src
);
74 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
75 pte_t
*huge_pmd_share(struct mm_struct
*mm
, unsigned long addr
, pud_t
*pud
);
78 extern unsigned long hugepages_treat_as_movable
;
79 extern const unsigned long hugetlb_zero
, hugetlb_infinity
;
80 extern int sysctl_hugetlb_shm_group
;
81 extern struct list_head huge_boot_pages
;
85 pte_t
*huge_pte_alloc(struct mm_struct
*mm
,
86 unsigned long addr
, unsigned long sz
);
87 pte_t
*huge_pte_offset(struct mm_struct
*mm
, unsigned long addr
);
88 int huge_pmd_unshare(struct mm_struct
*mm
, unsigned long *addr
, pte_t
*ptep
);
89 struct page
*follow_huge_addr(struct mm_struct
*mm
, unsigned long address
,
91 struct page
*follow_huge_pmd(struct mm_struct
*mm
, unsigned long address
,
92 pmd_t
*pmd
, int write
);
93 struct page
*follow_huge_pud(struct mm_struct
*mm
, unsigned long address
,
94 pud_t
*pud
, int write
);
95 int pmd_huge(pmd_t pmd
);
96 int pud_huge(pud_t pmd
);
97 unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
98 unsigned long address
, unsigned long end
, pgprot_t newprot
);
100 #else /* !CONFIG_HUGETLB_PAGE */
102 static inline int PageHuge(struct page
*page
)
107 static inline void reset_vma_resv_huge_pages(struct vm_area_struct
*vma
)
111 static inline unsigned long hugetlb_total_pages(void)
116 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
117 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
118 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
119 static inline void hugetlb_report_meminfo(struct seq_file
*m
)
122 #define hugetlb_report_node_meminfo(n, buf) 0
123 static inline void hugetlb_show_meminfo(void)
126 #define follow_huge_pmd(mm, addr, pmd, write) NULL
127 #define follow_huge_pud(mm, addr, pud, write) NULL
128 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
129 #define pmd_huge(x) 0
130 #define pud_huge(x) 0
131 #define is_hugepage_only_range(mm, addr, len) 0
132 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
133 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
134 #define huge_pte_offset(mm, address) 0
135 static inline int dequeue_hwpoisoned_huge_page(struct page
*page
)
140 #define isolate_huge_page(p, l) false
141 #define putback_active_hugepage(p) do {} while (0)
142 #define is_hugepage_active(x) false
143 static inline void copy_huge_page(struct page
*dst
, struct page
*src
)
147 static inline unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
148 unsigned long address
, unsigned long end
, pgprot_t newprot
)
153 static inline void __unmap_hugepage_range_final(struct mmu_gather
*tlb
,
154 struct vm_area_struct
*vma
, unsigned long start
,
155 unsigned long end
, struct page
*ref_page
)
160 static inline void __unmap_hugepage_range(struct mmu_gather
*tlb
,
161 struct vm_area_struct
*vma
, unsigned long start
,
162 unsigned long end
, struct page
*ref_page
)
167 #endif /* !CONFIG_HUGETLB_PAGE */
169 #define HUGETLB_ANON_FILE "anon_hugepage"
173 * The file will be used as an shm file so shmfs accounting rules
176 HUGETLB_SHMFS_INODE
= 1,
178 * The file is being created on the internal vfs mount and shmfs
179 * accounting rules do not apply
181 HUGETLB_ANONHUGE_INODE
= 2,
184 #ifdef CONFIG_HUGETLBFS
185 struct hugetlbfs_sb_info
{
186 long max_inodes
; /* inodes allowed */
187 long free_inodes
; /* inodes free */
188 spinlock_t stat_lock
;
189 struct hstate
*hstate
;
190 struct hugepage_subpool
*spool
;
193 static inline struct hugetlbfs_sb_info
*HUGETLBFS_SB(struct super_block
*sb
)
195 return sb
->s_fs_info
;
198 extern const struct file_operations hugetlbfs_file_operations
;
199 extern const struct vm_operations_struct hugetlb_vm_ops
;
200 struct file
*hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acct
,
201 struct user_struct
**user
, int creat_flags
,
204 static inline int is_file_hugepages(struct file
*file
)
206 if (file
->f_op
== &hugetlbfs_file_operations
)
208 if (is_file_shm_hugepages(file
))
215 #else /* !CONFIG_HUGETLBFS */
217 #define is_file_hugepages(file) 0
218 static inline struct file
*
219 hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acctflag
,
220 struct user_struct
**user
, int creat_flags
,
223 return ERR_PTR(-ENOSYS
);
226 #endif /* !CONFIG_HUGETLBFS */
228 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
229 unsigned long hugetlb_get_unmapped_area(struct file
*file
, unsigned long addr
,
230 unsigned long len
, unsigned long pgoff
,
231 unsigned long flags
);
232 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
234 #ifdef CONFIG_HUGETLB_PAGE
236 #define HSTATE_NAME_LEN 32
237 /* Defines one hugetlb page size */
239 int next_nid_to_alloc
;
240 int next_nid_to_free
;
243 unsigned long max_huge_pages
;
244 unsigned long nr_huge_pages
;
245 unsigned long free_huge_pages
;
246 unsigned long resv_huge_pages
;
247 unsigned long surplus_huge_pages
;
248 unsigned long nr_overcommit_huge_pages
;
249 struct list_head hugepage_activelist
;
250 struct list_head hugepage_freelists
[MAX_NUMNODES
];
251 unsigned int nr_huge_pages_node
[MAX_NUMNODES
];
252 unsigned int free_huge_pages_node
[MAX_NUMNODES
];
253 unsigned int surplus_huge_pages_node
[MAX_NUMNODES
];
254 #ifdef CONFIG_CGROUP_HUGETLB
255 /* cgroup control files */
256 struct cftype cgroup_files
[5];
258 char name
[HSTATE_NAME_LEN
];
261 struct huge_bootmem_page
{
262 struct list_head list
;
263 struct hstate
*hstate
;
264 #ifdef CONFIG_HIGHMEM
269 struct page
*alloc_huge_page_node(struct hstate
*h
, int nid
);
270 struct page
*alloc_huge_page_noerr(struct vm_area_struct
*vma
,
271 unsigned long addr
, int avoid_reserve
);
274 int __init
alloc_bootmem_huge_page(struct hstate
*h
);
276 void __init
hugetlb_add_hstate(unsigned order
);
277 struct hstate
*size_to_hstate(unsigned long size
);
279 #ifndef HUGE_MAX_HSTATE
280 #define HUGE_MAX_HSTATE 1
283 extern struct hstate hstates
[HUGE_MAX_HSTATE
];
284 extern unsigned int default_hstate_idx
;
286 #define default_hstate (hstates[default_hstate_idx])
288 static inline struct hstate
*hstate_inode(struct inode
*i
)
290 struct hugetlbfs_sb_info
*hsb
;
291 hsb
= HUGETLBFS_SB(i
->i_sb
);
295 static inline struct hstate
*hstate_file(struct file
*f
)
297 return hstate_inode(file_inode(f
));
300 static inline struct hstate
*hstate_sizelog(int page_size_log
)
303 return &default_hstate
;
304 return size_to_hstate(1 << page_size_log
);
307 static inline struct hstate
*hstate_vma(struct vm_area_struct
*vma
)
309 return hstate_file(vma
->vm_file
);
312 static inline unsigned long huge_page_size(struct hstate
*h
)
314 return (unsigned long)PAGE_SIZE
<< h
->order
;
317 extern unsigned long vma_kernel_pagesize(struct vm_area_struct
*vma
);
319 extern unsigned long vma_mmu_pagesize(struct vm_area_struct
*vma
);
321 static inline unsigned long huge_page_mask(struct hstate
*h
)
326 static inline unsigned int huge_page_order(struct hstate
*h
)
331 static inline unsigned huge_page_shift(struct hstate
*h
)
333 return h
->order
+ PAGE_SHIFT
;
336 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
338 return 1 << h
->order
;
341 static inline unsigned int blocks_per_huge_page(struct hstate
*h
)
343 return huge_page_size(h
) / 512;
346 #include <asm/hugetlb.h>
348 #ifndef arch_make_huge_pte
349 static inline pte_t
arch_make_huge_pte(pte_t entry
, struct vm_area_struct
*vma
,
350 struct page
*page
, int writable
)
356 static inline struct hstate
*page_hstate(struct page
*page
)
358 return size_to_hstate(PAGE_SIZE
<< compound_order(page
));
361 static inline unsigned hstate_index_to_shift(unsigned index
)
363 return hstates
[index
].order
+ PAGE_SHIFT
;
366 static inline int hstate_index(struct hstate
*h
)
371 pgoff_t
__basepage_index(struct page
*page
);
373 /* Return page->index in PAGE_SIZE units */
374 static inline pgoff_t
basepage_index(struct page
*page
)
376 if (!PageCompound(page
))
379 return __basepage_index(page
);
382 extern void dissolve_free_huge_pages(unsigned long start_pfn
,
383 unsigned long end_pfn
);
384 int pmd_huge_support(void);
386 * Currently hugepage migration is enabled only for pmd-based hugepage.
387 * This function will be updated when hugepage migration is more widely
390 static inline int hugepage_migration_support(struct hstate
*h
)
392 return pmd_huge_support() && (huge_page_shift(h
) == PMD_SHIFT
);
395 #else /* CONFIG_HUGETLB_PAGE */
397 #define alloc_huge_page_node(h, nid) NULL
398 #define alloc_huge_page_noerr(v, a, r) NULL
399 #define alloc_bootmem_huge_page(h) NULL
400 #define hstate_file(f) NULL
401 #define hstate_sizelog(s) NULL
402 #define hstate_vma(v) NULL
403 #define hstate_inode(i) NULL
404 #define huge_page_size(h) PAGE_SIZE
405 #define huge_page_mask(h) PAGE_MASK
406 #define vma_kernel_pagesize(v) PAGE_SIZE
407 #define vma_mmu_pagesize(v) PAGE_SIZE
408 #define huge_page_order(h) 0
409 #define huge_page_shift(h) PAGE_SHIFT
410 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
414 #define hstate_index_to_shift(index) 0
415 #define hstate_index(h) 0
417 static inline pgoff_t
basepage_index(struct page
*page
)
421 #define dissolve_free_huge_pages(s, e) do {} while (0)
422 #define pmd_huge_support() 0
423 #define hugepage_migration_support(h) 0
424 #endif /* CONFIG_HUGETLB_PAGE */
426 #endif /* _LINUX_HUGETLB_H */