Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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 int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
12 unsigned long address, pmd_t *pmd,
13 pmd_t orig_pmd);
14extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
15extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
16 unsigned long addr,
17 pmd_t *pmd,
18 unsigned int flags);
19extern int zap_huge_pmd(struct mmu_gather *tlb,
20 struct vm_area_struct *vma,
21 pmd_t *pmd, unsigned long addr);
22extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
23 unsigned long addr, unsigned long end,
24 unsigned char *vec);
25extern int move_huge_pmd(struct vm_area_struct *vma,
26 struct vm_area_struct *new_vma,
27 unsigned long old_addr,
28 unsigned long new_addr, unsigned long old_end,
29 pmd_t *old_pmd, pmd_t *new_pmd);
30extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
31 unsigned long addr, pgprot_t newprot);
32
33enum transparent_hugepage_flag {
34 TRANSPARENT_HUGEPAGE_FLAG,
35 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
36 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
37 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
38 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
39#ifdef CONFIG_DEBUG_VM
40 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
41#endif
42};
43
44enum page_check_address_pmd_flag {
45 PAGE_CHECK_ADDRESS_PMD_FLAG,
46 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
47 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
48};
49extern pmd_t *page_check_address_pmd(struct page *page,
50 struct mm_struct *mm,
51 unsigned long address,
52 enum page_check_address_pmd_flag flag);
53
54#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
55#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
56
57#ifdef CONFIG_TRANSPARENT_HUGEPAGE
58#define HPAGE_PMD_SHIFT HPAGE_SHIFT
59#define HPAGE_PMD_MASK HPAGE_MASK
60#define HPAGE_PMD_SIZE HPAGE_SIZE
61
62extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
63
64#define transparent_hugepage_enabled(__vma) \
65 ((transparent_hugepage_flags & \
66 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
67 (transparent_hugepage_flags & \
68 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
69 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
70 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
71 !is_vma_temporary_stack(__vma))
72#define transparent_hugepage_defrag(__vma) \
73 ((transparent_hugepage_flags & \
74 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
75 (transparent_hugepage_flags & \
76 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
77 (__vma)->vm_flags & VM_HUGEPAGE))
78#ifdef CONFIG_DEBUG_VM
79#define transparent_hugepage_debug_cow() \
80 (transparent_hugepage_flags & \
81 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
82#else /* CONFIG_DEBUG_VM */
83#define transparent_hugepage_debug_cow() 0
84#endif /* CONFIG_DEBUG_VM */
85
86extern unsigned long transparent_hugepage_flags;
87extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
88 pmd_t *dst_pmd, pmd_t *src_pmd,
89 struct vm_area_struct *vma,
90 unsigned long addr, unsigned long end);
91extern int handle_pte_fault(struct mm_struct *mm,
92 struct vm_area_struct *vma, unsigned long address,
93 pte_t *pte, pmd_t *pmd, unsigned int flags);
94extern int split_huge_page(struct page *page);
95extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
96#define split_huge_page_pmd(__mm, __pmd) \
97 do { \
98 pmd_t *____pmd = (__pmd); \
99 if (unlikely(pmd_trans_huge(*____pmd))) \
100 __split_huge_page_pmd(__mm, ____pmd); \
101 } while (0)
102#define wait_split_huge_page(__anon_vma, __pmd) \
103 do { \
104 pmd_t *____pmd = (__pmd); \
105 anon_vma_lock(__anon_vma); \
106 anon_vma_unlock(__anon_vma); \
107 BUG_ON(pmd_trans_splitting(*____pmd) || \
108 pmd_trans_huge(*____pmd)); \
109 } while (0)
110#if HPAGE_PMD_ORDER > MAX_ORDER
111#error "hugepages can't be allocated by the buddy allocator"
112#endif
113extern int hugepage_madvise(struct vm_area_struct *vma,
114 unsigned long *vm_flags, int advice);
115extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
116 unsigned long start,
117 unsigned long end,
118 long adjust_next);
119extern int __pmd_trans_huge_lock(pmd_t *pmd,
120 struct vm_area_struct *vma);
121/* mmap_sem must be held on entry */
122static inline int pmd_trans_huge_lock(pmd_t *pmd,
123 struct vm_area_struct *vma)
124{
125 VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
126 if (pmd_trans_huge(*pmd))
127 return __pmd_trans_huge_lock(pmd, vma);
128 else
129 return 0;
130}
131static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
132 unsigned long start,
133 unsigned long end,
134 long adjust_next)
135{
136 if (!vma->anon_vma || vma->vm_ops)
137 return;
138 __vma_adjust_trans_huge(vma, start, end, adjust_next);
139}
140static inline int hpage_nr_pages(struct page *page)
141{
142 if (unlikely(PageTransHuge(page)))
143 return HPAGE_PMD_NR;
144 return 1;
145}
146static inline struct page *compound_trans_head(struct page *page)
147{
148 if (PageTail(page)) {
149 struct page *head;
150 head = page->first_page;
151 smp_rmb();
152 /*
153 * head may be a dangling pointer.
154 * __split_huge_page_refcount clears PageTail before
155 * overwriting first_page, so if PageTail is still
156 * there it means the head pointer isn't dangling.
157 */
158 if (PageTail(page))
159 return head;
160 }
161 return page;
162}
163#else /* CONFIG_TRANSPARENT_HUGEPAGE */
164#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
165#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
166#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
167
168#define hpage_nr_pages(x) 1
169
170#define transparent_hugepage_enabled(__vma) 0
171
172#define transparent_hugepage_flags 0UL
173static inline int split_huge_page(struct page *page)
174{
175 return 0;
176}
177#define split_huge_page_pmd(__mm, __pmd) \
178 do { } while (0)
179#define wait_split_huge_page(__anon_vma, __pmd) \
180 do { } while (0)
181#define compound_trans_head(page) compound_head(page)
182static inline int hugepage_madvise(struct vm_area_struct *vma,
183 unsigned long *vm_flags, int advice)
184{
185 BUG();
186 return 0;
187}
188static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
189 unsigned long start,
190 unsigned long end,
191 long adjust_next)
192{
193}
194static inline int pmd_trans_huge_lock(pmd_t *pmd,
195 struct vm_area_struct *vma)
196{
197 return 0;
198}
199#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
200
201#endif /* _LINUX_HUGE_MM_H */