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Andrea Arcangeli71e3aac2011-01-13 15:46:52 -08001#ifndef _LINUX_HUGE_MM_H
2#define _LINUX_HUGE_MM_H
3
4extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
5 struct vm_area_struct *vma,
6 unsigned long address, pmd_t *pmd,
7 unsigned int flags);
8extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
9 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
10 struct vm_area_struct *vma);
Will Deacona1dd4502012-12-11 16:01:27 -080011extern void huge_pmd_set_accessed(struct mm_struct *mm,
12 struct vm_area_struct *vma,
13 unsigned long address, pmd_t *pmd,
14 pmd_t orig_pmd, int dirty);
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080015extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
16 unsigned long address, pmd_t *pmd,
17 pmd_t orig_pmd);
David Rientjesb676b292012-10-08 16:34:03 -070018extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080019 unsigned long addr,
20 pmd_t *pmd,
21 unsigned int flags);
22extern int zap_huge_pmd(struct mmu_gather *tlb,
23 struct vm_area_struct *vma,
Shaohua Lif21760b2012-01-12 17:19:16 -080024 pmd_t *pmd, unsigned long addr);
Johannes Weiner0ca16342011-01-13 15:47:02 -080025extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
26 unsigned long addr, unsigned long end,
27 unsigned char *vec);
Andrea Arcangeli37a1c492011-10-31 17:08:30 -070028extern int move_huge_pmd(struct vm_area_struct *vma,
29 struct vm_area_struct *new_vma,
30 unsigned long old_addr,
31 unsigned long new_addr, unsigned long old_end,
32 pmd_t *old_pmd, pmd_t *new_pmd);
Johannes Weinercd7548a2011-01-13 15:47:04 -080033extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
Mel Gorman4b10e7d2012-10-25 14:16:32 +020034 unsigned long addr, pgprot_t newprot,
35 int prot_numa);
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080036
37enum transparent_hugepage_flag {
38 TRANSPARENT_HUGEPAGE_FLAG,
39 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
40 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
41 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
Andrea Arcangeliba761492011-01-13 15:46:58 -080042 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
Kirill A. Shutemov79da5402012-12-12 13:51:12 -080043 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080044#ifdef CONFIG_DEBUG_VM
45 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
46#endif
47};
48
49enum page_check_address_pmd_flag {
50 PAGE_CHECK_ADDRESS_PMD_FLAG,
51 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
52 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
53};
54extern pmd_t *page_check_address_pmd(struct page *page,
55 struct mm_struct *mm,
56 unsigned long address,
Kirill A. Shutemov117b0792013-11-14 14:30:56 -080057 enum page_check_address_pmd_flag flag,
58 spinlock_t **ptl);
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080059
Naoya Horiguchid8c37c42012-03-21 16:34:27 -070060#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
61#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
62
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080063#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Aneesh Kumar K.Vfde52792013-06-05 17:14:05 -070064#define HPAGE_PMD_SHIFT PMD_SHIFT
65#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
66#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080067
Alex Shi20995972012-05-29 15:06:31 -070068extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
69
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080070#define transparent_hugepage_enabled(__vma) \
Andrea Arcangelia664b2d2011-01-13 15:47:17 -080071 ((transparent_hugepage_flags & \
72 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
73 (transparent_hugepage_flags & \
74 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
75 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
Andrea Arcangelia7d6e4e2011-02-15 19:02:45 +010076 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
77 !is_vma_temporary_stack(__vma))
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080078#define transparent_hugepage_defrag(__vma) \
79 ((transparent_hugepage_flags & \
80 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
81 (transparent_hugepage_flags & \
82 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
83 (__vma)->vm_flags & VM_HUGEPAGE))
Kirill A. Shutemov79da5402012-12-12 13:51:12 -080084#define transparent_hugepage_use_zero_page() \
85 (transparent_hugepage_flags & \
86 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -080087#ifdef CONFIG_DEBUG_VM
88#define transparent_hugepage_debug_cow() \
89 (transparent_hugepage_flags & \
90 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
91#else /* CONFIG_DEBUG_VM */
92#define transparent_hugepage_debug_cow() 0
93#endif /* CONFIG_DEBUG_VM */
94
95extern unsigned long transparent_hugepage_flags;
Shaohua Li5bc7b8a2013-04-29 15:08:36 -070096extern int split_huge_page_to_list(struct page *page, struct list_head *list);
97static inline int split_huge_page(struct page *page)
98{
99 return split_huge_page_to_list(page, NULL);
100}
Kirill A. Shutemove1803772012-12-12 13:50:59 -0800101extern void __split_huge_page_pmd(struct vm_area_struct *vma,
102 unsigned long address, pmd_t *pmd);
103#define split_huge_page_pmd(__vma, __address, __pmd) \
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800104 do { \
105 pmd_t *____pmd = (__pmd); \
106 if (unlikely(pmd_trans_huge(*____pmd))) \
Kirill A. Shutemove1803772012-12-12 13:50:59 -0800107 __split_huge_page_pmd(__vma, __address, \
108 ____pmd); \
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800109 } while (0)
110#define wait_split_huge_page(__anon_vma, __pmd) \
111 do { \
112 pmd_t *____pmd = (__pmd); \
Ingo Molnar4fc3f1d2012-12-02 19:56:50 +0000113 anon_vma_lock_write(__anon_vma); \
Konstantin Khlebnikov08b52702013-02-22 16:34:40 -0800114 anon_vma_unlock_write(__anon_vma); \
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800115 BUG_ON(pmd_trans_splitting(*____pmd) || \
116 pmd_trans_huge(*____pmd)); \
117 } while (0)
Kirill A. Shutemove1803772012-12-12 13:50:59 -0800118extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
119 pmd_t *pmd);
Steve Capperdfa5e232013-05-07 14:46:03 +0100120#if HPAGE_PMD_ORDER >= MAX_ORDER
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800121#error "hugepages can't be allocated by the buddy allocator"
122#endif
Andrea Arcangeli60ab3242011-01-13 15:47:18 -0800123extern int hugepage_madvise(struct vm_area_struct *vma,
124 unsigned long *vm_flags, int advice);
Andrea Arcangeli94fcc582011-01-13 15:47:08 -0800125extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
126 unsigned long start,
127 unsigned long end,
128 long adjust_next);
Kirill A. Shutemovbf929152013-11-14 14:30:54 -0800129extern int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
130 spinlock_t **ptl);
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700131/* mmap_sem must be held on entry */
Kirill A. Shutemovbf929152013-11-14 14:30:54 -0800132static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
133 spinlock_t **ptl)
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700134{
Sasha Levin81d1b092014-10-09 15:28:10 -0700135 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700136 if (pmd_trans_huge(*pmd))
Kirill A. Shutemovbf929152013-11-14 14:30:54 -0800137 return __pmd_trans_huge_lock(pmd, vma, ptl);
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700138 else
139 return 0;
140}
Andrea Arcangeli94fcc582011-01-13 15:47:08 -0800141static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
142 unsigned long start,
143 unsigned long end,
144 long adjust_next)
145{
Andrea Arcangeli78f11a22011-04-27 15:26:45 -0700146 if (!vma->anon_vma || vma->vm_ops)
Andrea Arcangeli94fcc582011-01-13 15:47:08 -0800147 return;
148 __vma_adjust_trans_huge(vma, start, end, adjust_next);
149}
Rik van Riel2c888cf2011-01-13 15:47:13 -0800150static inline int hpage_nr_pages(struct page *page)
151{
152 if (unlikely(PageTransHuge(page)))
153 return HPAGE_PMD_NR;
154 return 1;
155}
Mel Gormand10e63f2012-10-25 14:16:31 +0200156
Mel Gorman4daae3b2012-11-02 11:33:45 +0000157extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
158 unsigned long addr, pmd_t pmd, pmd_t *pmdp);
Mel Gormand10e63f2012-10-25 14:16:31 +0200159
Wang, Yalin56873f42015-02-11 15:24:51 -0800160extern struct page *huge_zero_page;
161
162static inline bool is_huge_zero_page(struct page *page)
163{
164 return ACCESS_ONCE(huge_zero_page) == page;
165}
166
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800167#else /* CONFIG_TRANSPARENT_HUGEPAGE */
Naoya Horiguchid8c37c42012-03-21 16:34:27 -0700168#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
169#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
170#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800171
Rik van Riel2c888cf2011-01-13 15:47:13 -0800172#define hpage_nr_pages(x) 1
173
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800174#define transparent_hugepage_enabled(__vma) 0
175
176#define transparent_hugepage_flags 0UL
Shaohua Li5bc7b8a2013-04-29 15:08:36 -0700177static inline int
178split_huge_page_to_list(struct page *page, struct list_head *list)
179{
180 return 0;
181}
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800182static inline int split_huge_page(struct page *page)
183{
184 return 0;
185}
Kirill A. Shutemove1803772012-12-12 13:50:59 -0800186#define split_huge_page_pmd(__vma, __address, __pmd) \
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800187 do { } while (0)
188#define wait_split_huge_page(__anon_vma, __pmd) \
189 do { } while (0)
Kirill A. Shutemove1803772012-12-12 13:50:59 -0800190#define split_huge_page_pmd_mm(__mm, __address, __pmd) \
191 do { } while (0)
Andrea Arcangeli60ab3242011-01-13 15:47:18 -0800192static inline int hugepage_madvise(struct vm_area_struct *vma,
193 unsigned long *vm_flags, int advice)
Andrea Arcangeli0af4e982011-01-13 15:46:55 -0800194{
195 BUG();
196 return 0;
197}
Andrea Arcangeli94fcc582011-01-13 15:47:08 -0800198static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
199 unsigned long start,
200 unsigned long end,
201 long adjust_next)
202{
203}
Kirill A. Shutemovbf929152013-11-14 14:30:54 -0800204static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
205 spinlock_t **ptl)
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700206{
207 return 0;
208}
Mel Gormand10e63f2012-10-25 14:16:31 +0200209
Mel Gorman4daae3b2012-11-02 11:33:45 +0000210static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
211 unsigned long addr, pmd_t pmd, pmd_t *pmdp)
Mel Gormand10e63f2012-10-25 14:16:31 +0200212{
Mel Gorman4daae3b2012-11-02 11:33:45 +0000213 return 0;
Mel Gormand10e63f2012-10-25 14:16:31 +0200214}
215
Wang, Yalin56873f42015-02-11 15:24:51 -0800216static inline bool is_huge_zero_page(struct page *page)
217{
218 return false;
219}
220
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800221#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
222
223#endif /* _LINUX_HUGE_MM_H */