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 madvise_free_huge_pmd(struct mmu_gather *tlb,
23 struct vm_area_struct *vma,
24 pmd_t *pmd, unsigned long addr, unsigned long next);
25extern int zap_huge_pmd(struct mmu_gather *tlb,
26 struct vm_area_struct *vma,
27 pmd_t *pmd, unsigned long addr);
28extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
29 unsigned long addr, unsigned long end,
30 unsigned char *vec);
31extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
32 unsigned long new_addr, unsigned long old_end,
33 pmd_t *old_pmd, pmd_t *new_pmd);
34extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
35 unsigned long addr, pgprot_t newprot,
36 int prot_numa);
37int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *,
38 pfn_t pfn, bool write);
39enum transparent_hugepage_flag {
40 TRANSPARENT_HUGEPAGE_FLAG,
41 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
42 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
43 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
44 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
45 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
46 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
47#ifdef CONFIG_DEBUG_VM
48 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
49#endif
50};
51
52#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
53#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
54
55#ifdef CONFIG_TRANSPARENT_HUGEPAGE
56struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
57 pmd_t *pmd, int flags);
58
59#define HPAGE_PMD_SHIFT PMD_SHIFT
60#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
61#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
62
63extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
64
65#define transparent_hugepage_enabled(__vma) \
66 ((transparent_hugepage_flags & \
67 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
68 (transparent_hugepage_flags & \
69 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
70 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
71 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
72 !is_vma_temporary_stack(__vma))
73#define transparent_hugepage_use_zero_page() \
74 (transparent_hugepage_flags & \
75 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
76#ifdef CONFIG_DEBUG_VM
77#define transparent_hugepage_debug_cow() \
78 (transparent_hugepage_flags & \
79 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
80#else /* CONFIG_DEBUG_VM */
81#define transparent_hugepage_debug_cow() 0
82#endif /* CONFIG_DEBUG_VM */
83
84extern unsigned long transparent_hugepage_flags;
85
86extern void prep_transhuge_page(struct page *page);
87extern void free_transhuge_page(struct page *page);
88
89int split_huge_page_to_list(struct page *page, struct list_head *list);
90static inline int split_huge_page(struct page *page)
91{
92 return split_huge_page_to_list(page, NULL);
93}
94void deferred_split_huge_page(struct page *page);
95
96void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
97 unsigned long address, bool freeze, struct page *page);
98
99#define split_huge_pmd(__vma, __pmd, __address) \
100 do { \
101 pmd_t *____pmd = (__pmd); \
102 if (pmd_trans_huge(*____pmd) \
103 || pmd_devmap(*____pmd)) \
104 __split_huge_pmd(__vma, __pmd, __address, \
105 false, NULL); \
106 } while (0)
107
108
109void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
110 bool freeze, struct page *page);
111
112extern int hugepage_madvise(struct vm_area_struct *vma,
113 unsigned long *vm_flags, int advice);
114extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
115 unsigned long start,
116 unsigned long end,
117 long adjust_next);
118extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
119 struct vm_area_struct *vma);
120/* mmap_sem must be held on entry */
121static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
122 struct vm_area_struct *vma)
123{
124 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
125 if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
126 return __pmd_trans_huge_lock(pmd, vma);
127 else
128 return NULL;
129}
130static inline int hpage_nr_pages(struct page *page)
131{
132 if (unlikely(PageTransHuge(page)))
133 return HPAGE_PMD_NR;
134 return 1;
135}
136
137extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
138 unsigned long addr, pmd_t pmd, pmd_t *pmdp);
139
140extern struct page *huge_zero_page;
141
142static inline bool is_huge_zero_page(struct page *page)
143{
144 return ACCESS_ONCE(huge_zero_page) == page;
145}
146
147static inline bool is_huge_zero_pmd(pmd_t pmd)
148{
149 return is_huge_zero_page(pmd_page(pmd));
150}
151
152struct page *get_huge_zero_page(void);
153void put_huge_zero_page(void);
154
155#else /* CONFIG_TRANSPARENT_HUGEPAGE */
156#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
157#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
158#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
159
160#define hpage_nr_pages(x) 1
161
162#define transparent_hugepage_enabled(__vma) 0
163
164#define transparent_hugepage_flags 0UL
165static inline int
166split_huge_page_to_list(struct page *page, struct list_head *list)
167{
168 return 0;
169}
170static inline int split_huge_page(struct page *page)
171{
172 return 0;
173}
174static inline void deferred_split_huge_page(struct page *page) {}
175#define split_huge_pmd(__vma, __pmd, __address) \
176 do { } while (0)
177
178static inline void split_huge_pmd_address(struct vm_area_struct *vma,
179 unsigned long address, bool freeze, struct page *page) {}
180
181static inline int hugepage_madvise(struct vm_area_struct *vma,
182 unsigned long *vm_flags, int advice)
183{
184 BUG();
185 return 0;
186}
187static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
188 unsigned long start,
189 unsigned long end,
190 long adjust_next)
191{
192}
193static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
194 struct vm_area_struct *vma)
195{
196 return NULL;
197}
198
199static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
200 unsigned long addr, pmd_t pmd, pmd_t *pmdp)
201{
202 return 0;
203}
204
205static inline bool is_huge_zero_page(struct page *page)
206{
207 return false;
208}
209
210static inline void put_huge_zero_page(void)
211{
212 BUILD_BUG();
213}
214
215static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
216 unsigned long addr, pmd_t *pmd, int flags)
217{
218 return NULL;
219}
220#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
221
222#endif /* _LINUX_HUGE_MM_H */