Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1#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);
11extern 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);
15extern 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);
18extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
19 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,
24 pmd_t *pmd, unsigned long addr);
25extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
26 unsigned long addr, unsigned long end,
27 unsigned char *vec);
28extern 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);
33extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
34 unsigned long addr, pgprot_t newprot,
35 int prot_numa);
36
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,
42 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
43 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
44#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,
57 enum page_check_address_pmd_flag flag);
58
59#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
60#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
61
62#ifdef CONFIG_TRANSPARENT_HUGEPAGE
63#define HPAGE_PMD_SHIFT HPAGE_SHIFT
64#define HPAGE_PMD_MASK HPAGE_MASK
65#define HPAGE_PMD_SIZE HPAGE_SIZE
66
67extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
68
69#define transparent_hugepage_enabled(__vma) \
70 ((transparent_hugepage_flags & \
71 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
72 (transparent_hugepage_flags & \
73 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
74 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
75 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
76 !is_vma_temporary_stack(__vma))
77#define transparent_hugepage_defrag(__vma) \
78 ((transparent_hugepage_flags & \
79 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
80 (transparent_hugepage_flags & \
81 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
82 (__vma)->vm_flags & VM_HUGEPAGE))
83#define transparent_hugepage_use_zero_page() \
84 (transparent_hugepage_flags & \
85 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
86#ifdef CONFIG_DEBUG_VM
87#define transparent_hugepage_debug_cow() \
88 (transparent_hugepage_flags & \
89 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
90#else /* CONFIG_DEBUG_VM */
91#define transparent_hugepage_debug_cow() 0
92#endif /* CONFIG_DEBUG_VM */
93
94extern unsigned long transparent_hugepage_flags;
95extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
96 pmd_t *dst_pmd, pmd_t *src_pmd,
97 struct vm_area_struct *vma,
98 unsigned long addr, unsigned long end);
99extern int handle_pte_fault(struct mm_struct *mm,
100 struct vm_area_struct *vma, unsigned long address,
101 pte_t *pte, pmd_t *pmd, unsigned int flags);
102extern int split_huge_page(struct page *page);
103extern void __split_huge_page_pmd(struct vm_area_struct *vma,
104 unsigned long address, pmd_t *pmd);
105#define split_huge_page_pmd(__vma, __address, __pmd) \
106 do { \
107 pmd_t *____pmd = (__pmd); \
108 if (unlikely(pmd_trans_huge(*____pmd))) \
109 __split_huge_page_pmd(__vma, __address, \
110 ____pmd); \
111 } while (0)
112#define wait_split_huge_page(__anon_vma, __pmd) \
113 do { \
114 pmd_t *____pmd = (__pmd); \
115 anon_vma_lock_write(__anon_vma); \
116 anon_vma_unlock_write(__anon_vma); \
117 BUG_ON(pmd_trans_splitting(*____pmd) || \
118 pmd_trans_huge(*____pmd)); \
119 } while (0)
120extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
121 pmd_t *pmd);
122#if HPAGE_PMD_ORDER > MAX_ORDER
123#error "hugepages can't be allocated by the buddy allocator"
124#endif
125extern int hugepage_madvise(struct vm_area_struct *vma,
126 unsigned long *vm_flags, int advice);
127extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
128 unsigned long start,
129 unsigned long end,
130 long adjust_next);
131extern int __pmd_trans_huge_lock(pmd_t *pmd,
132 struct vm_area_struct *vma);
133/* mmap_sem must be held on entry */
134static inline int pmd_trans_huge_lock(pmd_t *pmd,
135 struct vm_area_struct *vma)
136{
137 VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
138 if (pmd_trans_huge(*pmd))
139 return __pmd_trans_huge_lock(pmd, vma);
140 else
141 return 0;
142}
143static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
144 unsigned long start,
145 unsigned long end,
146 long adjust_next)
147{
148 if (!vma->anon_vma || vma->vm_ops)
149 return;
150 __vma_adjust_trans_huge(vma, start, end, adjust_next);
151}
152static inline int hpage_nr_pages(struct page *page)
153{
154 if (unlikely(PageTransHuge(page)))
155 return HPAGE_PMD_NR;
156 return 1;
157}
158static inline struct page *compound_trans_head(struct page *page)
159{
160 if (PageTail(page)) {
161 struct page *head;
162 head = page->first_page;
163 smp_rmb();
164 /*
165 * head may be a dangling pointer.
166 * __split_huge_page_refcount clears PageTail before
167 * overwriting first_page, so if PageTail is still
168 * there it means the head pointer isn't dangling.
169 */
170 if (PageTail(page))
171 return head;
172 }
173 return page;
174}
175
176extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
177 unsigned long addr, pmd_t pmd, pmd_t *pmdp);
178
179#else /* CONFIG_TRANSPARENT_HUGEPAGE */
180#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
181#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
182#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
183
184#define hpage_nr_pages(x) 1
185
186#define transparent_hugepage_enabled(__vma) 0
187
188#define transparent_hugepage_flags 0UL
189static inline int split_huge_page(struct page *page)
190{
191 return 0;
192}
193#define split_huge_page_pmd(__vma, __address, __pmd) \
194 do { } while (0)
195#define wait_split_huge_page(__anon_vma, __pmd) \
196 do { } while (0)
197#define split_huge_page_pmd_mm(__mm, __address, __pmd) \
198 do { } while (0)
199#define compound_trans_head(page) compound_head(page)
200static inline int hugepage_madvise(struct vm_area_struct *vma,
201 unsigned long *vm_flags, int advice)
202{
203 BUG();
204 return 0;
205}
206static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
207 unsigned long start,
208 unsigned long end,
209 long adjust_next)
210{
211}
212static inline int pmd_trans_huge_lock(pmd_t *pmd,
213 struct vm_area_struct *vma)
214{
215 return 0;
216}
217
218static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
219 unsigned long addr, pmd_t pmd, pmd_t *pmdp)
220{
221 return 0;
222}
223
224#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
225
226#endif /* _LINUX_HUGE_MM_H */