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 fault_env *fe);
5extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
6 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
7 struct vm_area_struct *vma);
8extern void huge_pmd_set_accessed(struct fault_env *fe, pmd_t orig_pmd);
9extern int do_huge_pmd_wp_page(struct fault_env *fe, pmd_t orig_pmd);
10extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
11 unsigned long addr,
12 pmd_t *pmd,
13 unsigned int flags);
14extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
15 struct vm_area_struct *vma,
16 pmd_t *pmd, unsigned long addr, unsigned long next);
17extern int zap_huge_pmd(struct mmu_gather *tlb,
18 struct vm_area_struct *vma,
19 pmd_t *pmd, unsigned long addr);
20extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
21 unsigned long addr, unsigned long end,
22 unsigned char *vec);
23extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
24 unsigned long new_addr, unsigned long old_end,
25 pmd_t *old_pmd, pmd_t *new_pmd, bool *need_flush);
26extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
27 unsigned long addr, pgprot_t newprot,
28 int prot_numa);
29int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *,
30 pfn_t pfn, bool write);
31enum transparent_hugepage_flag {
32 TRANSPARENT_HUGEPAGE_FLAG,
33 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
34 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
35 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
36 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
37 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
38 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
39#ifdef CONFIG_DEBUG_VM
40 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
41#endif
42};
43
44struct kobject;
45struct kobj_attribute;
46
47extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
48 struct kobj_attribute *attr,
49 const char *buf, size_t count,
50 enum transparent_hugepage_flag flag);
51extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
52 struct kobj_attribute *attr, char *buf,
53 enum transparent_hugepage_flag flag);
54extern struct kobj_attribute shmem_enabled_attr;
55
56#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
57#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
58
59#ifdef CONFIG_TRANSPARENT_HUGEPAGE
60struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
61 pmd_t *pmd, int flags);
62
63#define HPAGE_PMD_SHIFT PMD_SHIFT
64#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
65#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
66
67extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
68
69#define transparent_hugepage_enabled(__vma) \
70 ((transparent_hugepage_flags & \
71 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
72 (transparent_hugepage_flags & \
73 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
74 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
75 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
76 !is_vma_temporary_stack(__vma))
77#define transparent_hugepage_use_zero_page() \
78 (transparent_hugepage_flags & \
79 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
80#ifdef CONFIG_DEBUG_VM
81#define transparent_hugepage_debug_cow() \
82 (transparent_hugepage_flags & \
83 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
84#else /* CONFIG_DEBUG_VM */
85#define transparent_hugepage_debug_cow() 0
86#endif /* CONFIG_DEBUG_VM */
87
88extern unsigned long transparent_hugepage_flags;
89
90extern unsigned long thp_get_unmapped_area(struct file *filp,
91 unsigned long addr, unsigned long len, unsigned long pgoff,
92 unsigned long flags);
93
94extern void prep_transhuge_page(struct page *page);
95extern void free_transhuge_page(struct page *page);
96
97int split_huge_page_to_list(struct page *page, struct list_head *list);
98static inline int split_huge_page(struct page *page)
99{
100 return split_huge_page_to_list(page, NULL);
101}
102void deferred_split_huge_page(struct page *page);
103
104void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
105 unsigned long address, bool freeze, struct page *page);
106
107#define split_huge_pmd(__vma, __pmd, __address) \
108 do { \
109 pmd_t *____pmd = (__pmd); \
110 if (pmd_trans_huge(*____pmd) \
111 || pmd_devmap(*____pmd)) \
112 __split_huge_pmd(__vma, __pmd, __address, \
113 false, NULL); \
114 } while (0)
115
116
117void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
118 bool freeze, struct page *page);
119
120extern int hugepage_madvise(struct vm_area_struct *vma,
121 unsigned long *vm_flags, int advice);
122extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
123 unsigned long start,
124 unsigned long end,
125 long adjust_next);
126extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
127 struct vm_area_struct *vma);
128/* mmap_sem must be held on entry */
129static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
130 struct vm_area_struct *vma)
131{
132 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
133 if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
134 return __pmd_trans_huge_lock(pmd, vma);
135 else
136 return NULL;
137}
138static inline int hpage_nr_pages(struct page *page)
139{
140 if (unlikely(PageTransHuge(page)))
141 return HPAGE_PMD_NR;
142 return 1;
143}
144
145extern int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd);
146
147extern struct page *huge_zero_page;
148
149static inline bool is_huge_zero_page(struct page *page)
150{
151 return ACCESS_ONCE(huge_zero_page) == page;
152}
153
154static inline bool is_huge_zero_pmd(pmd_t pmd)
155{
156 return is_huge_zero_page(pmd_page(pmd));
157}
158
159struct page *mm_get_huge_zero_page(struct mm_struct *mm);
160void mm_put_huge_zero_page(struct mm_struct *mm);
161
162#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
163
164#else /* CONFIG_TRANSPARENT_HUGEPAGE */
165#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
166#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
167#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
168
169#define hpage_nr_pages(x) 1
170
171#define transparent_hugepage_enabled(__vma) 0
172
173static inline void prep_transhuge_page(struct page *page) {}
174
175#define transparent_hugepage_flags 0UL
176
177#define thp_get_unmapped_area NULL
178
179static inline int
180split_huge_page_to_list(struct page *page, struct list_head *list)
181{
182 return 0;
183}
184static inline int split_huge_page(struct page *page)
185{
186 return 0;
187}
188static inline void deferred_split_huge_page(struct page *page) {}
189#define split_huge_pmd(__vma, __pmd, __address) \
190 do { } while (0)
191
192static inline void split_huge_pmd_address(struct vm_area_struct *vma,
193 unsigned long address, bool freeze, struct page *page) {}
194
195static inline int hugepage_madvise(struct vm_area_struct *vma,
196 unsigned long *vm_flags, int advice)
197{
198 BUG();
199 return 0;
200}
201static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
202 unsigned long start,
203 unsigned long end,
204 long adjust_next)
205{
206}
207static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
208 struct vm_area_struct *vma)
209{
210 return NULL;
211}
212
213static inline int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd)
214{
215 return 0;
216}
217
218static inline bool is_huge_zero_page(struct page *page)
219{
220 return false;
221}
222
223static inline void mm_put_huge_zero_page(struct mm_struct *mm)
224{
225 return;
226}
227
228static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
229 unsigned long addr, pmd_t *pmd, int flags)
230{
231 return NULL;
232}
233#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
234
235#endif /* _LINUX_HUGE_MM_H */