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,
32 struct vm_area_struct *new_vma,
33 unsigned long old_addr,
34 unsigned long new_addr, unsigned long old_end,
35 pmd_t *old_pmd, pmd_t *new_pmd);
36extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
37 unsigned long addr, pgprot_t newprot,
38 int prot_numa);
39int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *,
40 pfn_t pfn, bool write);
41enum transparent_hugepage_flag {
42 TRANSPARENT_HUGEPAGE_FLAG,
43 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
44 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
45 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
46 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
47 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
48#ifdef CONFIG_DEBUG_VM
49 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
50#endif
51};
52
53#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
54#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
55
56#ifdef CONFIG_TRANSPARENT_HUGEPAGE
57struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
58 pmd_t *pmd, int flags);
59
60#define HPAGE_PMD_SHIFT PMD_SHIFT
61#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
62#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
63
64extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
65
66#define transparent_hugepage_enabled(__vma) \
67 ((transparent_hugepage_flags & \
68 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
69 (transparent_hugepage_flags & \
70 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
71 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
72 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
73 !is_vma_temporary_stack(__vma))
74#define transparent_hugepage_defrag(__vma) \
75 ((transparent_hugepage_flags & \
76 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
77 (transparent_hugepage_flags & \
78 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
79 (__vma)->vm_flags & VM_HUGEPAGE))
80#define transparent_hugepage_use_zero_page() \
81 (transparent_hugepage_flags & \
82 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
83#ifdef CONFIG_DEBUG_VM
84#define transparent_hugepage_debug_cow() \
85 (transparent_hugepage_flags & \
86 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
87#else /* CONFIG_DEBUG_VM */
88#define transparent_hugepage_debug_cow() 0
89#endif /* CONFIG_DEBUG_VM */
90
91extern unsigned long transparent_hugepage_flags;
92
93extern void prep_transhuge_page(struct page *page);
94extern void free_transhuge_page(struct page *page);
95
96int split_huge_page_to_list(struct page *page, struct list_head *list);
97static inline int split_huge_page(struct page *page)
98{
99 return split_huge_page_to_list(page, NULL);
100}
101void deferred_split_huge_page(struct page *page);
102
103void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
104 unsigned long address);
105
106#define split_huge_pmd(__vma, __pmd, __address) \
107 do { \
108 pmd_t *____pmd = (__pmd); \
109 if (pmd_trans_huge(*____pmd) \
110 || pmd_devmap(*____pmd)) \
111 __split_huge_pmd(__vma, __pmd, __address); \
112 } while (0)
113
114#if HPAGE_PMD_ORDER >= MAX_ORDER
115#error "hugepages can't be allocated by the buddy allocator"
116#endif
117extern int hugepage_madvise(struct vm_area_struct *vma,
118 unsigned long *vm_flags, int advice);
119extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
120 unsigned long start,
121 unsigned long end,
122 long adjust_next);
123extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
124 struct vm_area_struct *vma);
125/* mmap_sem must be held on entry */
126static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
127 struct vm_area_struct *vma)
128{
129 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
130 if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
131 return __pmd_trans_huge_lock(pmd, vma);
132 else
133 return false;
134}
135static inline int hpage_nr_pages(struct page *page)
136{
137 if (unlikely(PageTransHuge(page)))
138 return HPAGE_PMD_NR;
139 return 1;
140}
141
142extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
143 unsigned long addr, pmd_t pmd, pmd_t *pmdp);
144
145extern struct page *huge_zero_page;
146
147static inline bool is_huge_zero_page(struct page *page)
148{
149 return ACCESS_ONCE(huge_zero_page) == page;
150}
151
152static inline bool is_huge_zero_pmd(pmd_t pmd)
153{
154 return is_huge_zero_page(pmd_page(pmd));
155}
156
157struct page *get_huge_zero_page(void);
158
159#else /* CONFIG_TRANSPARENT_HUGEPAGE */
160#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
161#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
162#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
163
164#define hpage_nr_pages(x) 1
165
166#define transparent_hugepage_enabled(__vma) 0
167
168#define transparent_hugepage_flags 0UL
169static inline int
170split_huge_page_to_list(struct page *page, struct list_head *list)
171{
172 return 0;
173}
174static inline int split_huge_page(struct page *page)
175{
176 return 0;
177}
178static inline void deferred_split_huge_page(struct page *page) {}
179#define split_huge_pmd(__vma, __pmd, __address) \
180 do { } while (0)
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
210
211static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
212 unsigned long addr, pmd_t *pmd, int flags)
213{
214 return NULL;
215}
216#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
217
218#endif /* _LINUX_HUGE_MM_H */