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 #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
100 pte_t
*huge_pmd_share(struct mm_struct
*mm
, unsigned long addr
, pud_t
*pud
);
103 extern int hugepages_treat_as_movable
;
104 extern int sysctl_hugetlb_shm_group
;
105 extern struct list_head huge_boot_pages
;
109 pte_t
*huge_pte_alloc(struct mm_struct
*mm
,
110 unsigned long addr
, unsigned long sz
);
111 pte_t
*huge_pte_offset(struct mm_struct
*mm
, unsigned long addr
);
112 int huge_pmd_unshare(struct mm_struct
*mm
, unsigned long *addr
, pte_t
*ptep
);
113 struct page
*follow_huge_addr(struct mm_struct
*mm
, unsigned long address
,
115 struct page
*follow_huge_pmd(struct mm_struct
*mm
, unsigned long address
,
116 pmd_t
*pmd
, int flags
);
117 struct page
*follow_huge_pud(struct mm_struct
*mm
, unsigned long address
,
118 pud_t
*pud
, int flags
);
119 int pmd_huge(pmd_t pmd
);
120 int pud_huge(pud_t pmd
);
121 unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
122 unsigned long address
, unsigned long end
, pgprot_t newprot
);
124 #else /* !CONFIG_HUGETLB_PAGE */
126 static inline void reset_vma_resv_huge_pages(struct vm_area_struct
*vma
)
130 static inline unsigned long hugetlb_total_pages(void)
135 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w) ({ BUG(); 0; })
136 #define follow_huge_addr(mm, addr, write) ERR_PTR(-EINVAL)
137 #define copy_hugetlb_page_range(src, dst, vma) ({ BUG(); 0; })
138 static inline void hugetlb_report_meminfo(struct seq_file
*m
)
141 #define hugetlb_report_node_meminfo(n, buf) 0
142 static inline void hugetlb_show_meminfo(void)
145 #define follow_huge_pmd(mm, addr, pmd, flags) NULL
146 #define follow_huge_pud(mm, addr, pud, flags) NULL
147 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
148 #define pmd_huge(x) 0
149 #define pud_huge(x) 0
150 #define is_hugepage_only_range(mm, addr, len) 0
151 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
152 #define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })
153 #define huge_pte_offset(mm, address) 0
154 static inline int dequeue_hwpoisoned_huge_page(struct page
*page
)
159 static inline bool isolate_huge_page(struct page
*page
, struct list_head
*list
)
163 #define putback_active_hugepage(p) do {} while (0)
165 static inline unsigned long hugetlb_change_protection(struct vm_area_struct
*vma
,
166 unsigned long address
, unsigned long end
, pgprot_t newprot
)
171 static inline void __unmap_hugepage_range_final(struct mmu_gather
*tlb
,
172 struct vm_area_struct
*vma
, unsigned long start
,
173 unsigned long end
, struct page
*ref_page
)
178 static inline void __unmap_hugepage_range(struct mmu_gather
*tlb
,
179 struct vm_area_struct
*vma
, unsigned long start
,
180 unsigned long end
, struct page
*ref_page
)
185 #endif /* !CONFIG_HUGETLB_PAGE */
187 * hugepages at page global directory. If arch support
188 * hugepages at pgd level, they need to define this.
191 #define pgd_huge(x) 0
195 static inline int pgd_write(pgd_t pgd
)
203 static inline int pud_write(pud_t pud
)
212 * Some architectures requires a hugepage directory format that is
213 * required to support multiple hugepage sizes. For example
214 * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
215 * introduced the same on powerpc. This allows for a more flexible hugepage
218 typedef struct { unsigned long pd
; } hugepd_t
;
219 #define is_hugepd(hugepd) (0)
220 #define __hugepd(x) ((hugepd_t) { (x) })
221 static inline int gup_huge_pd(hugepd_t hugepd
, unsigned long addr
,
222 unsigned pdshift
, unsigned long end
,
223 int write
, struct page
**pages
, int *nr
)
228 extern int gup_huge_pd(hugepd_t hugepd
, unsigned long addr
,
229 unsigned pdshift
, unsigned long end
,
230 int write
, struct page
**pages
, int *nr
);
233 #define HUGETLB_ANON_FILE "anon_hugepage"
237 * The file will be used as an shm file so shmfs accounting rules
240 HUGETLB_SHMFS_INODE
= 1,
242 * The file is being created on the internal vfs mount and shmfs
243 * accounting rules do not apply
245 HUGETLB_ANONHUGE_INODE
= 2,
248 #ifdef CONFIG_HUGETLBFS
249 struct hugetlbfs_sb_info
{
250 long max_inodes
; /* inodes allowed */
251 long free_inodes
; /* inodes free */
252 spinlock_t stat_lock
;
253 struct hstate
*hstate
;
254 struct hugepage_subpool
*spool
;
257 static inline struct hugetlbfs_sb_info
*HUGETLBFS_SB(struct super_block
*sb
)
259 return sb
->s_fs_info
;
262 extern const struct file_operations hugetlbfs_file_operations
;
263 extern const struct vm_operations_struct hugetlb_vm_ops
;
264 struct file
*hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acct
,
265 struct user_struct
**user
, int creat_flags
,
268 static inline int is_file_hugepages(struct file
*file
)
270 if (file
->f_op
== &hugetlbfs_file_operations
)
272 if (is_file_shm_hugepages(file
))
279 #else /* !CONFIG_HUGETLBFS */
281 #define is_file_hugepages(file) 0
282 static inline struct file
*
283 hugetlb_file_setup(const char *name
, size_t size
, vm_flags_t acctflag
,
284 struct user_struct
**user
, int creat_flags
,
287 return ERR_PTR(-ENOSYS
);
290 #endif /* !CONFIG_HUGETLBFS */
292 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
293 unsigned long hugetlb_get_unmapped_area(struct file
*file
, unsigned long addr
,
294 unsigned long len
, unsigned long pgoff
,
295 unsigned long flags
);
296 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
298 #ifdef CONFIG_HUGETLB_PAGE
300 #define HSTATE_NAME_LEN 32
301 /* Defines one hugetlb page size */
303 int next_nid_to_alloc
;
304 int next_nid_to_free
;
307 unsigned long max_huge_pages
;
308 unsigned long nr_huge_pages
;
309 unsigned long free_huge_pages
;
310 unsigned long resv_huge_pages
;
311 unsigned long surplus_huge_pages
;
312 unsigned long nr_overcommit_huge_pages
;
313 struct list_head hugepage_activelist
;
314 struct list_head hugepage_freelists
[MAX_NUMNODES
];
315 unsigned int nr_huge_pages_node
[MAX_NUMNODES
];
316 unsigned int free_huge_pages_node
[MAX_NUMNODES
];
317 unsigned int surplus_huge_pages_node
[MAX_NUMNODES
];
318 #ifdef CONFIG_CGROUP_HUGETLB
319 /* cgroup control files */
320 struct cftype cgroup_files
[5];
322 char name
[HSTATE_NAME_LEN
];
325 struct huge_bootmem_page
{
326 struct list_head list
;
327 struct hstate
*hstate
;
328 #ifdef CONFIG_HIGHMEM
333 struct page
*alloc_huge_page(struct vm_area_struct
*vma
,
334 unsigned long addr
, int avoid_reserve
);
335 struct page
*alloc_huge_page_node(struct hstate
*h
, int nid
);
336 struct page
*alloc_huge_page_noerr(struct vm_area_struct
*vma
,
337 unsigned long addr
, int avoid_reserve
);
338 int huge_add_to_page_cache(struct page
*page
, struct address_space
*mapping
,
342 int __init
alloc_bootmem_huge_page(struct hstate
*h
);
344 void __init
hugetlb_add_hstate(unsigned order
);
345 struct hstate
*size_to_hstate(unsigned long size
);
347 #ifndef HUGE_MAX_HSTATE
348 #define HUGE_MAX_HSTATE 1
351 extern struct hstate hstates
[HUGE_MAX_HSTATE
];
352 extern unsigned int default_hstate_idx
;
354 #define default_hstate (hstates[default_hstate_idx])
356 static inline struct hstate
*hstate_inode(struct inode
*i
)
358 struct hugetlbfs_sb_info
*hsb
;
359 hsb
= HUGETLBFS_SB(i
->i_sb
);
363 static inline struct hstate
*hstate_file(struct file
*f
)
365 return hstate_inode(file_inode(f
));
368 static inline struct hstate
*hstate_sizelog(int page_size_log
)
371 return &default_hstate
;
373 return size_to_hstate(1UL << page_size_log
);
376 static inline struct hstate
*hstate_vma(struct vm_area_struct
*vma
)
378 return hstate_file(vma
->vm_file
);
381 static inline unsigned long huge_page_size(struct hstate
*h
)
383 return (unsigned long)PAGE_SIZE
<< h
->order
;
386 extern unsigned long vma_kernel_pagesize(struct vm_area_struct
*vma
);
388 extern unsigned long vma_mmu_pagesize(struct vm_area_struct
*vma
);
390 static inline unsigned long huge_page_mask(struct hstate
*h
)
395 static inline unsigned int huge_page_order(struct hstate
*h
)
400 static inline unsigned huge_page_shift(struct hstate
*h
)
402 return h
->order
+ PAGE_SHIFT
;
405 static inline bool hstate_is_gigantic(struct hstate
*h
)
407 return huge_page_order(h
) >= MAX_ORDER
;
410 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
412 return 1 << h
->order
;
415 static inline unsigned int blocks_per_huge_page(struct hstate
*h
)
417 return huge_page_size(h
) / 512;
420 #include <asm/hugetlb.h>
422 #ifndef arch_make_huge_pte
423 static inline pte_t
arch_make_huge_pte(pte_t entry
, struct vm_area_struct
*vma
,
424 struct page
*page
, int writable
)
430 static inline struct hstate
*page_hstate(struct page
*page
)
432 VM_BUG_ON_PAGE(!PageHuge(page
), page
);
433 return size_to_hstate(PAGE_SIZE
<< compound_order(page
));
436 static inline unsigned hstate_index_to_shift(unsigned index
)
438 return hstates
[index
].order
+ PAGE_SHIFT
;
441 static inline int hstate_index(struct hstate
*h
)
446 pgoff_t
__basepage_index(struct page
*page
);
448 /* Return page->index in PAGE_SIZE units */
449 static inline pgoff_t
basepage_index(struct page
*page
)
451 if (!PageCompound(page
))
454 return __basepage_index(page
);
457 extern void dissolve_free_huge_pages(unsigned long start_pfn
,
458 unsigned long end_pfn
);
459 static inline int hugepage_migration_supported(struct hstate
*h
)
461 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
462 return huge_page_shift(h
) == PMD_SHIFT
;
468 static inline spinlock_t
*huge_pte_lockptr(struct hstate
*h
,
469 struct mm_struct
*mm
, pte_t
*pte
)
471 if (huge_page_size(h
) == PMD_SIZE
)
472 return pmd_lockptr(mm
, (pmd_t
*) pte
);
473 VM_BUG_ON(huge_page_size(h
) == PAGE_SIZE
);
474 return &mm
->page_table_lock
;
477 #ifndef hugepages_supported
479 * Some platform decide whether they support huge pages at boot
480 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
481 * when there is no such support
483 #define hugepages_supported() (HPAGE_SHIFT != 0)
486 #else /* CONFIG_HUGETLB_PAGE */
488 #define alloc_huge_page(v, a, r) NULL
489 #define alloc_huge_page_node(h, nid) NULL
490 #define alloc_huge_page_noerr(v, a, r) NULL
491 #define alloc_bootmem_huge_page(h) NULL
492 #define hstate_file(f) NULL
493 #define hstate_sizelog(s) NULL
494 #define hstate_vma(v) NULL
495 #define hstate_inode(i) NULL
496 #define page_hstate(page) NULL
497 #define huge_page_size(h) PAGE_SIZE
498 #define huge_page_mask(h) PAGE_MASK
499 #define vma_kernel_pagesize(v) PAGE_SIZE
500 #define vma_mmu_pagesize(v) PAGE_SIZE
501 #define huge_page_order(h) 0
502 #define huge_page_shift(h) PAGE_SHIFT
503 static inline unsigned int pages_per_huge_page(struct hstate
*h
)
507 #define hstate_index_to_shift(index) 0
508 #define hstate_index(h) 0
510 static inline pgoff_t
basepage_index(struct page
*page
)
514 #define dissolve_free_huge_pages(s, e) do {} while (0)
515 #define hugepage_migration_supported(h) 0
517 static inline spinlock_t
*huge_pte_lockptr(struct hstate
*h
,
518 struct mm_struct
*mm
, pte_t
*pte
)
520 return &mm
->page_table_lock
;
522 #endif /* CONFIG_HUGETLB_PAGE */
524 static inline spinlock_t
*huge_pte_lock(struct hstate
*h
,
525 struct mm_struct
*mm
, pte_t
*pte
)
529 ptl
= huge_pte_lockptr(h
, mm
, pte
);
534 #endif /* _LINUX_HUGETLB_H */