1 #ifndef _LINUX_HUGETLB_H
2 #define _LINUX_HUGETLB_H
4 #include <linux/mm_types.h>
5 #include <linux/mmdebug.h>
7 #include <linux/hugetlb_inline.h>
8 #include <linux/cgroup.h>
9 #include <linux/list.h>
10 #include <linux/kref.h>
16 #ifdef CONFIG_HUGETLB_PAGE
18 #include <linux/mempolicy.h>
19 #include <linux/shm.h>
20 #include <asm/tlbflush.h>
22 struct hugepage_subpool
{
25 long max_hpages
, used_hpages
;
31 struct list_head regions
;
33 extern struct resv_map
*resv_map_alloc(void);
34 void resv_map_release(struct kref
*ref
);
36 extern spinlock_t hugetlb_lock
;
37 extern int hugetlb_max_hstate __read_mostly
;
38 #define for_each_hstate(h) \
39 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
41 struct hugepage_subpool
*hugepage_new_subpool(long nr_blocks
);
42 void hugepage_put_subpool(struct hugepage_subpool
*spool
);
44 int PageHuge(struct page
*page
);
46 void reset_vma_resv_huge_pages(struct vm_area_struct
*vma
);
47 int hugetlb_sysctl_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
48 int hugetlb_overcommit_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
49 int hugetlb_treat_movable_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
52 int hugetlb_mempolicy_sysctl_handler(struct ctl_table
*, int,
53 void __user
*, size_t *, loff_t
*);
56 int copy_hugetlb_page_range(struct mm_struct
*, struct mm_struct
*, struct vm_area_struct
*);
57 long follow_hugetlb_page(struct mm_struct
*, struct vm_area_struct
*,
58 struct page
**, struct vm_area_struct
**,
59 unsigned long *, unsigned long *, long, unsigned int);
60 void unmap_hugepage_range(struct vm_area_struct
*,
61 unsigned long, unsigned long, struct page
*);
62 void __unmap_hugepage_range_final(struct mmu_gather
*tlb
,
63 struct vm_area_struct
*vma
,
64 unsigned long start
, unsigned long end
,
65 struct page
*ref_page
);
66 void __unmap_hugepage_range(struct mmu_gather
*tlb
, struct vm_area_struct
*vma
,
67 unsigned long start
, unsigned long end
,
68 struct page
*ref_page
);
69 void hugetlb_report_meminfo(struct seq_file
*);
70 int hugetlb_report_node_meminfo(int, char *);
71 void hugetlb_show_meminfo(void);
72 unsigned long hugetlb_total_pages(void);
73 int hugetlb_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
74 unsigned long address
, unsigned int flags
);
75 int hugetlb_reserve_pages(struct inode
*inode
, long from
, long to
,
76 struct vm_area_struct
*vma
,
78 void hugetlb_unreserve_pages(struct inode
*inode
, long offset
, long freed
);
79 int dequeue_hwpoisoned_huge_page(struct page
*page
);
80 bool isolate_huge_page(struct page
*page
, struct list_head
*list
);
81 void putback_active_hugepage(struct page
*page
);
82 bool is_hugepage_active(struct page
*page
);
84 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
85 pte_t
*huge_pmd_share(struct mm_struct
*mm
, unsigned long addr
, pud_t
*pud
);
88 extern unsigned long hugepages_treat_as_movable
;
89 extern const unsigned long hugetlb_zero
, hugetlb_infinity
;
90 extern int sysctl_hugetlb_shm_group
;
91 extern struct list_head huge_boot_pages
;
95 pte_t
*huge_pte_alloc(struct mm_struct
*mm
,
96 unsigned long addr
, unsigned long sz
);
97 pte_t
*huge_pte_offset(struct mm_struct
*mm
, unsigned long addr
);
98 int huge_pmd_unshare(struct mm_struct
*mm
, unsigned long *addr
, pte_t
*ptep
);
99 struct page
*follow_huge_addr(struct mm_struct
*mm
, unsigned long address
,
101 struct page
*follow_huge_pmd(struct mm_struct
*mm
, unsigned long address
,
102 pmd_t
*pmd
, int write
);
103 struct page
*follow_huge_pud(struct mm_struct
*mm
, unsigned long address
,
104 pud_t
*pud
, int write
);
105 int pmd_huge(pmd_t pmd
);
106 int pud_huge(pud_t pmd
);
107 unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
108 unsigned long address
, unsigned long end
, pgprot_t newprot
);
110 #else /* !CONFIG_HUGETLB_PAGE */
112 static inline int PageHuge(struct page
*page
)
117 static inline void reset_vma_resv_huge_pages(struct vm_area_struct
*vma
)
121 static inline unsigned long hugetlb_total_pages(void)
126 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
127 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
128 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
129 static inline void hugetlb_report_meminfo(struct seq_file
*m
)
132 #define hugetlb_report_node_meminfo(n, buf) 0
133 static inline void hugetlb_show_meminfo(void)
136 #define follow_huge_pmd(mm, addr, pmd, write) NULL
137 #define follow_huge_pud(mm, addr, pud, write) NULL
138 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
139 #define pmd_huge(x) 0
140 #define pud_huge(x) 0
141 #define is_hugepage_only_range(mm, addr, len) 0
142 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
143 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
144 #define huge_pte_offset(mm, address) 0
145 static inline int dequeue_hwpoisoned_huge_page(struct page
*page
)
150 static inline bool isolate_huge_page(struct page
*page
, struct list_head
*list
)
154 #define putback_active_hugepage(p) do {} while (0)
155 #define is_hugepage_active(x) false
157 static inline unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
158 unsigned long address
, unsigned long end
, pgprot_t newprot
)
163 static inline void __unmap_hugepage_range_final(struct mmu_gather
*tlb
,
164 struct vm_area_struct
*vma
, unsigned long start
,
165 unsigned long end
, struct page
*ref_page
)
170 static inline void __unmap_hugepage_range(struct mmu_gather
*tlb
,
171 struct vm_area_struct
*vma
, unsigned long start
,
172 unsigned long end
, struct page
*ref_page
)
177 #endif /* !CONFIG_HUGETLB_PAGE */
179 #define HUGETLB_ANON_FILE "anon_hugepage"
183 * The file will be used as an shm file so shmfs accounting rules
186 HUGETLB_SHMFS_INODE
= 1,
188 * The file is being created on the internal vfs mount and shmfs
189 * accounting rules do not apply
191 HUGETLB_ANONHUGE_INODE
= 2,
194 #ifdef CONFIG_HUGETLBFS
195 struct hugetlbfs_sb_info
{
196 long max_inodes
; /* inodes allowed */
197 long free_inodes
; /* inodes free */
198 spinlock_t stat_lock
;
199 struct hstate
*hstate
;
200 struct hugepage_subpool
*spool
;
203 static inline struct hugetlbfs_sb_info
*HUGETLBFS_SB(struct super_block
*sb
)
205 return sb
->s_fs_info
;
208 extern const struct file_operations hugetlbfs_file_operations
;
209 extern const struct vm_operations_struct hugetlb_vm_ops
;
210 struct file
*hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acct
,
211 struct user_struct
**user
, int creat_flags
,
214 static inline int is_file_hugepages(struct file
*file
)
216 if (file
->f_op
== &hugetlbfs_file_operations
)
218 if (is_file_shm_hugepages(file
))
225 #else /* !CONFIG_HUGETLBFS */
227 #define is_file_hugepages(file) 0
228 static inline struct file
*
229 hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acctflag
,
230 struct user_struct
**user
, int creat_flags
,
233 return ERR_PTR(-ENOSYS
);
236 #endif /* !CONFIG_HUGETLBFS */
238 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
239 unsigned long hugetlb_get_unmapped_area(struct file
*file
, unsigned long addr
,
240 unsigned long len
, unsigned long pgoff
,
241 unsigned long flags
);
242 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
244 #ifdef CONFIG_HUGETLB_PAGE
246 #define HSTATE_NAME_LEN 32
247 /* Defines one hugetlb page size */
249 int next_nid_to_alloc
;
250 int next_nid_to_free
;
253 unsigned long max_huge_pages
;
254 unsigned long nr_huge_pages
;
255 unsigned long free_huge_pages
;
256 unsigned long resv_huge_pages
;
257 unsigned long surplus_huge_pages
;
258 unsigned long nr_overcommit_huge_pages
;
259 struct list_head hugepage_activelist
;
260 struct list_head hugepage_freelists
[MAX_NUMNODES
];
261 unsigned int nr_huge_pages_node
[MAX_NUMNODES
];
262 unsigned int free_huge_pages_node
[MAX_NUMNODES
];
263 unsigned int surplus_huge_pages_node
[MAX_NUMNODES
];
264 #ifdef CONFIG_CGROUP_HUGETLB
265 /* cgroup control files */
266 struct cftype cgroup_files
[5];
268 char name
[HSTATE_NAME_LEN
];
271 struct huge_bootmem_page
{
272 struct list_head list
;
273 struct hstate
*hstate
;
274 #ifdef CONFIG_HIGHMEM
279 struct page
*alloc_huge_page_node(struct hstate
*h
, int nid
);
280 struct page
*alloc_huge_page_noerr(struct vm_area_struct
*vma
,
281 unsigned long addr
, int avoid_reserve
);
284 int __init
alloc_bootmem_huge_page(struct hstate
*h
);
286 void __init
hugetlb_add_hstate(unsigned order
);
287 struct hstate
*size_to_hstate(unsigned long size
);
289 #ifndef HUGE_MAX_HSTATE
290 #define HUGE_MAX_HSTATE 1
293 extern struct hstate hstates
[HUGE_MAX_HSTATE
];
294 extern unsigned int default_hstate_idx
;
296 #define default_hstate (hstates[default_hstate_idx])
298 static inline struct hstate
*hstate_inode(struct inode
*i
)
300 struct hugetlbfs_sb_info
*hsb
;
301 hsb
= HUGETLBFS_SB(i
->i_sb
);
305 static inline struct hstate
*hstate_file(struct file
*f
)
307 return hstate_inode(file_inode(f
));
310 static inline struct hstate
*hstate_sizelog(int page_size_log
)
313 return &default_hstate
;
314 return size_to_hstate(1 << page_size_log
);
317 static inline struct hstate
*hstate_vma(struct vm_area_struct
*vma
)
319 return hstate_file(vma
->vm_file
);
322 static inline unsigned long huge_page_size(struct hstate
*h
)
324 return (unsigned long)PAGE_SIZE
<< h
->order
;
327 extern unsigned long vma_kernel_pagesize(struct vm_area_struct
*vma
);
329 extern unsigned long vma_mmu_pagesize(struct vm_area_struct
*vma
);
331 static inline unsigned long huge_page_mask(struct hstate
*h
)
336 static inline unsigned int huge_page_order(struct hstate
*h
)
341 static inline unsigned huge_page_shift(struct hstate
*h
)
343 return h
->order
+ PAGE_SHIFT
;
346 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
348 return 1 << h
->order
;
351 static inline unsigned int blocks_per_huge_page(struct hstate
*h
)
353 return huge_page_size(h
) / 512;
356 #include <asm/hugetlb.h>
358 #ifndef arch_make_huge_pte
359 static inline pte_t
arch_make_huge_pte(pte_t entry
, struct vm_area_struct
*vma
,
360 struct page
*page
, int writable
)
366 static inline struct hstate
*page_hstate(struct page
*page
)
368 VM_BUG_ON_PAGE(!PageHuge(page
), page
);
369 return size_to_hstate(PAGE_SIZE
<< compound_order(page
));
372 static inline unsigned hstate_index_to_shift(unsigned index
)
374 return hstates
[index
].order
+ PAGE_SHIFT
;
377 static inline int hstate_index(struct hstate
*h
)
382 pgoff_t
__basepage_index(struct page
*page
);
384 /* Return page->index in PAGE_SIZE units */
385 static inline pgoff_t
basepage_index(struct page
*page
)
387 if (!PageCompound(page
))
390 return __basepage_index(page
);
393 extern void dissolve_free_huge_pages(unsigned long start_pfn
,
394 unsigned long end_pfn
);
395 int pmd_huge_support(void);
397 * Currently hugepage migration is enabled only for pmd-based hugepage.
398 * This function will be updated when hugepage migration is more widely
401 static inline int hugepage_migration_support(struct hstate
*h
)
403 return pmd_huge_support() && (huge_page_shift(h
) == PMD_SHIFT
);
406 static inline spinlock_t
*huge_pte_lockptr(struct hstate
*h
,
407 struct mm_struct
*mm
, pte_t
*pte
)
409 if (huge_page_size(h
) == PMD_SIZE
)
410 return pmd_lockptr(mm
, (pmd_t
*) pte
);
411 VM_BUG_ON(huge_page_size(h
) == PAGE_SIZE
);
412 return &mm
->page_table_lock
;
415 static inline bool hugepages_supported(void)
418 * Some platform decide whether they support huge pages at boot
419 * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
420 * there is no such support
422 return HPAGE_SHIFT
!= 0;
425 #else /* CONFIG_HUGETLB_PAGE */
427 #define alloc_huge_page_node(h, nid) NULL
428 #define alloc_huge_page_noerr(v, a, r) NULL
429 #define alloc_bootmem_huge_page(h) NULL
430 #define hstate_file(f) NULL
431 #define hstate_sizelog(s) NULL
432 #define hstate_vma(v) NULL
433 #define hstate_inode(i) NULL
434 #define page_hstate(page) NULL
435 #define huge_page_size(h) PAGE_SIZE
436 #define huge_page_mask(h) PAGE_MASK
437 #define vma_kernel_pagesize(v) PAGE_SIZE
438 #define vma_mmu_pagesize(v) PAGE_SIZE
439 #define huge_page_order(h) 0
440 #define huge_page_shift(h) PAGE_SHIFT
441 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
445 #define hstate_index_to_shift(index) 0
446 #define hstate_index(h) 0
448 static inline pgoff_t
basepage_index(struct page
*page
)
452 #define dissolve_free_huge_pages(s, e) do {} while (0)
453 #define pmd_huge_support() 0
454 #define hugepage_migration_support(h) 0
456 static inline spinlock_t
*huge_pte_lockptr(struct hstate
*h
,
457 struct mm_struct
*mm
, pte_t
*pte
)
459 return &mm
->page_table_lock
;
461 #endif /* CONFIG_HUGETLB_PAGE */
463 static inline spinlock_t
*huge_pte_lock(struct hstate
*h
,
464 struct mm_struct
*mm
, pte_t
*pte
)
468 ptl
= huge_pte_lockptr(h
, mm
, pte
);
473 #endif /* _LINUX_HUGETLB_H */