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 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);
36int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *,
37 unsigned long pfn, bool write);
38
39enum transparent_hugepage_flag {
40 TRANSPARENT_HUGEPAGE_FLAG,
41 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
42 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
43 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
44 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
45 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
46#ifdef CONFIG_DEBUG_VM
47 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
48#endif
49};
50
51enum page_check_address_pmd_flag {
52 PAGE_CHECK_ADDRESS_PMD_FLAG,
53 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
54 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
55};
56extern pmd_t *page_check_address_pmd(struct page *page,
57 struct mm_struct *mm,
58 unsigned long address,
59 enum page_check_address_pmd_flag flag,
60 spinlock_t **ptl);
61
62#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
63#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
64
65#ifdef CONFIG_TRANSPARENT_HUGEPAGE
66#define HPAGE_PMD_SHIFT PMD_SHIFT
67#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
68#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
69
70extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
71
72#define transparent_hugepage_enabled(__vma) \
73 ((transparent_hugepage_flags & \
74 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
75 (transparent_hugepage_flags & \
76 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
77 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
78 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
79 !is_vma_temporary_stack(__vma))
80#define transparent_hugepage_defrag(__vma) \
81 ((transparent_hugepage_flags & \
82 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
83 (transparent_hugepage_flags & \
84 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
85 (__vma)->vm_flags & VM_HUGEPAGE))
86#define transparent_hugepage_use_zero_page() \
87 (transparent_hugepage_flags & \
88 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
89#ifdef CONFIG_DEBUG_VM
90#define transparent_hugepage_debug_cow() \
91 (transparent_hugepage_flags & \
92 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
93#else /* CONFIG_DEBUG_VM */
94#define transparent_hugepage_debug_cow() 0
95#endif /* CONFIG_DEBUG_VM */
96
97extern unsigned long transparent_hugepage_flags;
98extern int split_huge_page_to_list(struct page *page, struct list_head *list);
99static inline int split_huge_page(struct page *page)
100{
101 return split_huge_page_to_list(page, NULL);
102}
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, struct vm_area_struct *vma,
132 spinlock_t **ptl);
133/* mmap_sem must be held on entry */
134static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
135 spinlock_t **ptl)
136{
137 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
138 if (pmd_trans_huge(*pmd))
139 return __pmd_trans_huge_lock(pmd, vma, ptl);
140 else
141 return 0;
142}
143static inline int hpage_nr_pages(struct page *page)
144{
145 if (unlikely(PageTransHuge(page)))
146 return HPAGE_PMD_NR;
147 return 1;
148}
149
150extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
151 unsigned long addr, pmd_t pmd, pmd_t *pmdp);
152
153extern struct page *huge_zero_page;
154
155static inline bool is_huge_zero_page(struct page *page)
156{
157 return ACCESS_ONCE(huge_zero_page) == page;
158}
159
160static inline bool is_huge_zero_pmd(pmd_t pmd)
161{
162 return is_huge_zero_page(pmd_page(pmd));
163}
164
165struct page *get_huge_zero_page(void);
166
167#else /* CONFIG_TRANSPARENT_HUGEPAGE */
168#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
169#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
170#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
171
172#define hpage_nr_pages(x) 1
173
174#define transparent_hugepage_enabled(__vma) 0
175
176#define transparent_hugepage_flags 0UL
177static inline int
178split_huge_page_to_list(struct page *page, struct list_head *list)
179{
180 return 0;
181}
182static inline int split_huge_page(struct page *page)
183{
184 return 0;
185}
186#define split_huge_page_pmd(__vma, __address, __pmd) \
187 do { } while (0)
188#define wait_split_huge_page(__anon_vma, __pmd) \
189 do { } while (0)
190#define split_huge_page_pmd_mm(__mm, __address, __pmd) \
191 do { } while (0)
192static inline int hugepage_madvise(struct vm_area_struct *vma,
193 unsigned long *vm_flags, int advice)
194{
195 BUG();
196 return 0;
197}
198static 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}
204static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
205 spinlock_t **ptl)
206{
207 return 0;
208}
209
210static 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)
212{
213 return 0;
214}
215
216static inline bool is_huge_zero_page(struct page *page)
217{
218 return false;
219}
220
221#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
222
223#endif /* _LINUX_HUGE_MM_H */