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 spinlock_t **ptl);
59
60#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
61#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
62
63#ifdef CONFIG_TRANSPARENT_HUGEPAGE
64#define HPAGE_PMD_SHIFT PMD_SHIFT
65#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
66#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
67
68extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
69
70#define transparent_hugepage_enabled(__vma) \
71 ((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))) && \
76 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
77 !is_vma_temporary_stack(__vma))
78#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))
84#define transparent_hugepage_use_zero_page() \
85 (transparent_hugepage_flags & \
86 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
87#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;
96extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
97 pmd_t *dst_pmd, pmd_t *src_pmd,
98 struct vm_area_struct *vma,
99 unsigned long addr, unsigned long end);
100extern int split_huge_page_to_list(struct page *page, struct list_head *list);
101static inline int split_huge_page(struct page *page)
102{
103 return split_huge_page_to_list(page, NULL);
104}
105extern void __split_huge_page_pmd(struct vm_area_struct *vma,
106 unsigned long address, pmd_t *pmd);
107#define split_huge_page_pmd(__vma, __address, __pmd) \
108 do { \
109 pmd_t *____pmd = (__pmd); \
110 if (unlikely(pmd_trans_huge(*____pmd))) \
111 __split_huge_page_pmd(__vma, __address, \
112 ____pmd); \
113 } while (0)
114#define wait_split_huge_page(__anon_vma, __pmd) \
115 do { \
116 pmd_t *____pmd = (__pmd); \
117 anon_vma_lock_write(__anon_vma); \
118 anon_vma_unlock_write(__anon_vma); \
119 BUG_ON(pmd_trans_splitting(*____pmd) || \
120 pmd_trans_huge(*____pmd)); \
121 } while (0)
122extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
123 pmd_t *pmd);
124#if HPAGE_PMD_ORDER >= MAX_ORDER
125#error "hugepages can't be allocated by the buddy allocator"
126#endif
127extern int hugepage_madvise(struct vm_area_struct *vma,
128 unsigned long *vm_flags, int advice);
129extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
130 unsigned long start,
131 unsigned long end,
132 long adjust_next);
133extern int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
134 spinlock_t **ptl);
135/* mmap_sem must be held on entry */
136static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
137 spinlock_t **ptl)
138{
139 VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
140 if (pmd_trans_huge(*pmd))
141 return __pmd_trans_huge_lock(pmd, vma, ptl);
142 else
143 return 0;
144}
145static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
146 unsigned long start,
147 unsigned long end,
148 long adjust_next)
149{
150 if (!vma->anon_vma || vma->vm_ops)
151 return;
152 __vma_adjust_trans_huge(vma, start, end, adjust_next);
153}
154static inline int hpage_nr_pages(struct page *page)
155{
156 if (unlikely(PageTransHuge(page)))
157 return HPAGE_PMD_NR;
158 return 1;
159}
160static inline struct page *compound_trans_head(struct page *page)
161{
162 if (PageTail(page)) {
163 struct page *head;
164 head = page->first_page;
165 smp_rmb();
166 /*
167 * head may be a dangling pointer.
168 * __split_huge_page_refcount clears PageTail before
169 * overwriting first_page, so if PageTail is still
170 * there it means the head pointer isn't dangling.
171 */
172 if (PageTail(page))
173 return head;
174 }
175 return page;
176}
177
178extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
179 unsigned long addr, pmd_t pmd, pmd_t *pmdp);
180
181#else /* CONFIG_TRANSPARENT_HUGEPAGE */
182#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
183#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
184#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
185
186#define hpage_nr_pages(x) 1
187
188#define transparent_hugepage_enabled(__vma) 0
189
190#define transparent_hugepage_flags 0UL
191static inline int
192split_huge_page_to_list(struct page *page, struct list_head *list)
193{
194 return 0;
195}
196static inline int split_huge_page(struct page *page)
197{
198 return 0;
199}
200#define split_huge_page_pmd(__vma, __address, __pmd) \
201 do { } while (0)
202#define wait_split_huge_page(__anon_vma, __pmd) \
203 do { } while (0)
204#define split_huge_page_pmd_mm(__mm, __address, __pmd) \
205 do { } while (0)
206#define compound_trans_head(page) compound_head(page)
207static inline int hugepage_madvise(struct vm_area_struct *vma,
208 unsigned long *vm_flags, int advice)
209{
210 BUG();
211 return 0;
212}
213static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
214 unsigned long start,
215 unsigned long end,
216 long adjust_next)
217{
218}
219static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
220 spinlock_t **ptl)
221{
222 return 0;
223}
224
225static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
226 unsigned long addr, pmd_t pmd, pmd_t *pmdp)
227{
228 return 0;
229}
230
231#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
232
233#endif /* _LINUX_HUGE_MM_H */