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
; /* Maximum huge pages or -1 if no maximum. */
26 long used_hpages
; /* Used count against maximum, includes */
27 /* both alloced and reserved pages. */
28 struct hstate
*hstate
;
29 long min_hpages
; /* Minimum huge pages or -1 if no minimum. */
30 long rsv_hpages
; /* Pages reserved against global pool to */
31 /* sasitfy minimum size. */
37 struct list_head regions
;
38 long adds_in_progress
;
39 struct list_head region_cache
;
40 long region_cache_count
;
42 extern struct resv_map
*resv_map_alloc(void);
43 void resv_map_release(struct kref
*ref
);
45 extern spinlock_t hugetlb_lock
;
46 extern int hugetlb_max_hstate __read_mostly
;
47 #define for_each_hstate(h) \
48 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
50 struct hugepage_subpool
*hugepage_new_subpool(struct hstate
*h
, long max_hpages
,
52 void hugepage_put_subpool(struct hugepage_subpool
*spool
);
54 void reset_vma_resv_huge_pages(struct vm_area_struct
*vma
);
55 int hugetlb_sysctl_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
56 int hugetlb_overcommit_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
57 int hugetlb_treat_movable_handler(struct ctl_table
*, int, void __user
*, size_t *, loff_t
*);
60 int hugetlb_mempolicy_sysctl_handler(struct ctl_table
*, int,
61 void __user
*, size_t *, loff_t
*);
64 int copy_hugetlb_page_range(struct mm_struct
*, struct mm_struct
*, struct vm_area_struct
*);
65 long follow_hugetlb_page(struct mm_struct
*, struct vm_area_struct
*,
66 struct page
**, struct vm_area_struct
**,
67 unsigned long *, unsigned long *, long, unsigned int);
68 void unmap_hugepage_range(struct vm_area_struct
*,
69 unsigned long, unsigned long, struct page
*);
70 void __unmap_hugepage_range_final(struct mmu_gather
*tlb
,
71 struct vm_area_struct
*vma
,
72 unsigned long start
, unsigned long end
,
73 struct page
*ref_page
);
74 void __unmap_hugepage_range(struct mmu_gather
*tlb
, struct vm_area_struct
*vma
,
75 unsigned long start
, unsigned long end
,
76 struct page
*ref_page
);
77 void hugetlb_report_meminfo(struct seq_file
*);
78 int hugetlb_report_node_meminfo(int, char *);
79 void hugetlb_show_meminfo(void);
80 unsigned long hugetlb_total_pages(void);
81 int hugetlb_fault(struct mm_struct
*mm
, struct vm_area_struct
*vma
,
82 unsigned long address
, unsigned int flags
);
83 int hugetlb_reserve_pages(struct inode
*inode
, long from
, long to
,
84 struct vm_area_struct
*vma
,
86 long hugetlb_unreserve_pages(struct inode
*inode
, long start
, long end
,
88 int dequeue_hwpoisoned_huge_page(struct page
*page
);
89 bool isolate_huge_page(struct page
*page
, struct list_head
*list
);
90 void putback_active_hugepage(struct page
*page
);
91 void free_huge_page(struct page
*page
);
92 void hugetlb_fix_reserve_counts(struct inode
*inode
, bool restore_reserve
);
93 extern struct mutex
*hugetlb_fault_mutex_table
;
94 u32
hugetlb_fault_mutex_hash(struct hstate
*h
, struct mm_struct
*mm
,
95 struct vm_area_struct
*vma
,
96 struct address_space
*mapping
,
97 pgoff_t idx
, unsigned long address
);
99 pte_t
*huge_pmd_share(struct mm_struct
*mm
, unsigned long addr
, pud_t
*pud
);
101 extern int hugepages_treat_as_movable
;
102 extern int sysctl_hugetlb_shm_group
;
103 extern struct list_head huge_boot_pages
;
107 pte_t
*huge_pte_alloc(struct mm_struct
*mm
,
108 unsigned long addr
, unsigned long sz
);
109 pte_t
*huge_pte_offset(struct mm_struct
*mm
, unsigned long addr
);
110 int huge_pmd_unshare(struct mm_struct
*mm
, unsigned long *addr
, pte_t
*ptep
);
111 struct page
*follow_huge_addr(struct mm_struct
*mm
, unsigned long address
,
113 struct page
*follow_huge_pmd(struct mm_struct
*mm
, unsigned long address
,
114 pmd_t
*pmd
, int flags
);
115 struct page
*follow_huge_pud(struct mm_struct
*mm
, unsigned long address
,
116 pud_t
*pud
, int flags
);
117 int pmd_huge(pmd_t pmd
);
118 int pud_huge(pud_t pmd
);
119 unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
120 unsigned long address
, unsigned long end
, pgprot_t newprot
);
122 #else /* !CONFIG_HUGETLB_PAGE */
124 static inline void reset_vma_resv_huge_pages(struct vm_area_struct
*vma
)
128 static inline unsigned long hugetlb_total_pages(void)
133 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
134 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
135 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
136 static inline void hugetlb_report_meminfo(struct seq_file
*m
)
139 #define hugetlb_report_node_meminfo(n, buf) 0
140 static inline void hugetlb_show_meminfo(void)
143 #define follow_huge_pmd(mm, addr, pmd, flags) NULL
144 #define follow_huge_pud(mm, addr, pud, flags) NULL
145 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
146 #define pmd_huge(x) 0
147 #define pud_huge(x) 0
148 #define is_hugepage_only_range(mm, addr, len) 0
149 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
150 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
151 #define huge_pte_offset(mm, address) 0
152 static inline int dequeue_hwpoisoned_huge_page(struct page
*page
)
157 static inline bool isolate_huge_page(struct page
*page
, struct list_head
*list
)
161 #define putback_active_hugepage(p) do {} while (0)
163 static inline unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
164 unsigned long address
, unsigned long end
, pgprot_t newprot
)
169 static inline void __unmap_hugepage_range_final(struct mmu_gather
*tlb
,
170 struct vm_area_struct
*vma
, unsigned long start
,
171 unsigned long end
, struct page
*ref_page
)
176 static inline void __unmap_hugepage_range(struct mmu_gather
*tlb
,
177 struct vm_area_struct
*vma
, unsigned long start
,
178 unsigned long end
, struct page
*ref_page
)
183 #endif /* !CONFIG_HUGETLB_PAGE */
185 * hugepages at page global directory. If arch support
186 * hugepages at pgd level, they need to define this.
189 #define pgd_huge(x) 0
193 static inline int pgd_write(pgd_t pgd
)
201 static inline int pud_write(pud_t pud
)
210 * Some architectures requires a hugepage directory format that is
211 * required to support multiple hugepage sizes. For example
212 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
213 * introduced the same on powerpc. This allows for a more flexible hugepage
216 typedef struct { unsigned long pd
; } hugepd_t
;
217 #define is_hugepd(hugepd) (0)
218 #define __hugepd(x) ((hugepd_t) { (x) })
219 static inline int gup_huge_pd(hugepd_t hugepd
, unsigned long addr
,
220 unsigned pdshift
, unsigned long end
,
221 int write
, struct page
**pages
, int *nr
)
226 extern int gup_huge_pd(hugepd_t hugepd
, unsigned long addr
,
227 unsigned pdshift
, unsigned long end
,
228 int write
, struct page
**pages
, int *nr
);
231 #define HUGETLB_ANON_FILE "anon_hugepage"
235 * The file will be used as an shm file so shmfs accounting rules
238 HUGETLB_SHMFS_INODE
= 1,
240 * The file is being created on the internal vfs mount and shmfs
241 * accounting rules do not apply
243 HUGETLB_ANONHUGE_INODE
= 2,
246 #ifdef CONFIG_HUGETLBFS
247 struct hugetlbfs_sb_info
{
248 long max_inodes
; /* inodes allowed */
249 long free_inodes
; /* inodes free */
250 spinlock_t stat_lock
;
251 struct hstate
*hstate
;
252 struct hugepage_subpool
*spool
;
255 static inline struct hugetlbfs_sb_info
*HUGETLBFS_SB(struct super_block
*sb
)
257 return sb
->s_fs_info
;
260 extern const struct file_operations hugetlbfs_file_operations
;
261 extern const struct vm_operations_struct hugetlb_vm_ops
;
262 struct file
*hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acct
,
263 struct user_struct
**user
, int creat_flags
,
266 static inline int is_file_hugepages(struct file
*file
)
268 if (file
->f_op
== &hugetlbfs_file_operations
)
270 if (is_file_shm_hugepages(file
))
277 #else /* !CONFIG_HUGETLBFS */
279 #define is_file_hugepages(file) 0
280 static inline struct file
*
281 hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acctflag
,
282 struct user_struct
**user
, int creat_flags
,
285 return ERR_PTR(-ENOSYS
);
288 #endif /* !CONFIG_HUGETLBFS */
290 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
291 unsigned long hugetlb_get_unmapped_area(struct file
*file
, unsigned long addr
,
292 unsigned long len
, unsigned long pgoff
,
293 unsigned long flags
);
294 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
296 #ifdef CONFIG_HUGETLB_PAGE
298 #define HSTATE_NAME_LEN 32
299 /* Defines one hugetlb page size */
301 int next_nid_to_alloc
;
302 int next_nid_to_free
;
305 unsigned long max_huge_pages
;
306 unsigned long nr_huge_pages
;
307 unsigned long free_huge_pages
;
308 unsigned long resv_huge_pages
;
309 unsigned long surplus_huge_pages
;
310 unsigned long nr_overcommit_huge_pages
;
311 struct list_head hugepage_activelist
;
312 struct list_head hugepage_freelists
[MAX_NUMNODES
];
313 unsigned int nr_huge_pages_node
[MAX_NUMNODES
];
314 unsigned int free_huge_pages_node
[MAX_NUMNODES
];
315 unsigned int surplus_huge_pages_node
[MAX_NUMNODES
];
316 #ifdef CONFIG_CGROUP_HUGETLB
317 /* cgroup control files */
318 struct cftype cgroup_files
[5];
320 char name
[HSTATE_NAME_LEN
];
323 struct huge_bootmem_page
{
324 struct list_head list
;
325 struct hstate
*hstate
;
326 #ifdef CONFIG_HIGHMEM
331 struct page
*alloc_huge_page(struct vm_area_struct
*vma
,
332 unsigned long addr
, int avoid_reserve
);
333 struct page
*alloc_huge_page_node(struct hstate
*h
, int nid
);
334 struct page
*alloc_huge_page_noerr(struct vm_area_struct
*vma
,
335 unsigned long addr
, int avoid_reserve
);
336 int huge_add_to_page_cache(struct page
*page
, struct address_space
*mapping
,
340 int __init
alloc_bootmem_huge_page(struct hstate
*h
);
342 void __init
hugetlb_add_hstate(unsigned order
);
343 struct hstate
*size_to_hstate(unsigned long size
);
345 #ifndef HUGE_MAX_HSTATE
346 #define HUGE_MAX_HSTATE 1
349 extern struct hstate hstates
[HUGE_MAX_HSTATE
];
350 extern unsigned int default_hstate_idx
;
352 #define default_hstate (hstates[default_hstate_idx])
354 static inline struct hstate
*hstate_inode(struct inode
*i
)
356 struct hugetlbfs_sb_info
*hsb
;
357 hsb
= HUGETLBFS_SB(i
->i_sb
);
361 static inline struct hstate
*hstate_file(struct file
*f
)
363 return hstate_inode(file_inode(f
));
366 static inline struct hstate
*hstate_sizelog(int page_size_log
)
369 return &default_hstate
;
371 return size_to_hstate(1UL << page_size_log
);
374 static inline struct hstate
*hstate_vma(struct vm_area_struct
*vma
)
376 return hstate_file(vma
->vm_file
);
379 static inline unsigned long huge_page_size(struct hstate
*h
)
381 return (unsigned long)PAGE_SIZE
<< h
->order
;
384 extern unsigned long vma_kernel_pagesize(struct vm_area_struct
*vma
);
386 extern unsigned long vma_mmu_pagesize(struct vm_area_struct
*vma
);
388 static inline unsigned long huge_page_mask(struct hstate
*h
)
393 static inline unsigned int huge_page_order(struct hstate
*h
)
398 static inline unsigned huge_page_shift(struct hstate
*h
)
400 return h
->order
+ PAGE_SHIFT
;
403 static inline bool hstate_is_gigantic(struct hstate
*h
)
405 return huge_page_order(h
) >= MAX_ORDER
;
408 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
410 return 1 << h
->order
;
413 static inline unsigned int blocks_per_huge_page(struct hstate
*h
)
415 return huge_page_size(h
) / 512;
418 #include <asm/hugetlb.h>
420 #ifndef arch_make_huge_pte
421 static inline pte_t
arch_make_huge_pte(pte_t entry
, struct vm_area_struct
*vma
,
422 struct page
*page
, int writable
)
428 static inline struct hstate
*page_hstate(struct page
*page
)
430 VM_BUG_ON_PAGE(!PageHuge(page
), page
);
431 return size_to_hstate(PAGE_SIZE
<< compound_order(page
));
434 static inline unsigned hstate_index_to_shift(unsigned index
)
436 return hstates
[index
].order
+ PAGE_SHIFT
;
439 static inline int hstate_index(struct hstate
*h
)
444 pgoff_t
__basepage_index(struct page
*page
);
446 /* Return page->index in PAGE_SIZE units */
447 static inline pgoff_t
basepage_index(struct page
*page
)
449 if (!PageCompound(page
))
452 return __basepage_index(page
);
455 extern void dissolve_free_huge_pages(unsigned long start_pfn
,
456 unsigned long end_pfn
);
457 static inline int hugepage_migration_supported(struct hstate
*h
)
459 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
460 return huge_page_shift(h
) == PMD_SHIFT
;
466 static inline spinlock_t
*huge_pte_lockptr(struct hstate
*h
,
467 struct mm_struct
*mm
, pte_t
*pte
)
469 if (huge_page_size(h
) == PMD_SIZE
)
470 return pmd_lockptr(mm
, (pmd_t
*) pte
);
471 VM_BUG_ON(huge_page_size(h
) == PAGE_SIZE
);
472 return &mm
->page_table_lock
;
475 #ifndef hugepages_supported
477 * Some platform decide whether they support huge pages at boot
478 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
479 * when there is no such support
481 #define hugepages_supported() (HPAGE_SHIFT != 0)
484 void hugetlb_report_usage(struct seq_file
*m
, struct mm_struct
*mm
);
486 static inline void hugetlb_count_add(long l
, struct mm_struct
*mm
)
488 atomic_long_add(l
, &mm
->hugetlb_usage
);
491 static inline void hugetlb_count_sub(long l
, struct mm_struct
*mm
)
493 atomic_long_sub(l
, &mm
->hugetlb_usage
);
495 #else /* CONFIG_HUGETLB_PAGE */
497 #define alloc_huge_page(v, a, r) NULL
498 #define alloc_huge_page_node(h, nid) NULL
499 #define alloc_huge_page_noerr(v, a, r) NULL
500 #define alloc_bootmem_huge_page(h) NULL
501 #define hstate_file(f) NULL
502 #define hstate_sizelog(s) NULL
503 #define hstate_vma(v) NULL
504 #define hstate_inode(i) NULL
505 #define page_hstate(page) NULL
506 #define huge_page_size(h) PAGE_SIZE
507 #define huge_page_mask(h) PAGE_MASK
508 #define vma_kernel_pagesize(v) PAGE_SIZE
509 #define vma_mmu_pagesize(v) PAGE_SIZE
510 #define huge_page_order(h) 0
511 #define huge_page_shift(h) PAGE_SHIFT
512 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
516 #define hstate_index_to_shift(index) 0
517 #define hstate_index(h) 0
519 static inline pgoff_t
basepage_index(struct page
*page
)
523 #define dissolve_free_huge_pages(s, e) do {} while (0)
524 #define hugepage_migration_supported(h) 0
526 static inline spinlock_t
*huge_pte_lockptr(struct hstate
*h
,
527 struct mm_struct
*mm
, pte_t
*pte
)
529 return &mm
->page_table_lock
;
532 static inline void hugetlb_report_usage(struct seq_file
*f
, struct mm_struct
*m
)
536 static inline void hugetlb_count_sub(long l
, struct mm_struct
*mm
)
539 #endif /* CONFIG_HUGETLB_PAGE */
541 static inline spinlock_t
*huge_pte_lock(struct hstate
*h
,
542 struct mm_struct
*mm
, pte_t
*pte
)
546 ptl
= huge_pte_lockptr(h
, mm
, pte
);
551 #endif /* _LINUX_HUGETLB_H */