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 vm_fault *vmf);
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 vm_fault *vmf, pmd_t orig_pmd);
9extern int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
10 pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
11 struct vm_area_struct *vma);
12
13#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
14extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
15#else
16static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
17{
18}
19#endif
20
21extern int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
22extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
23 unsigned long addr,
24 pmd_t *pmd,
25 unsigned int flags);
26extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
27 struct vm_area_struct *vma,
28 pmd_t *pmd, unsigned long addr, unsigned long next);
29extern int zap_huge_pmd(struct mmu_gather *tlb,
30 struct vm_area_struct *vma,
31 pmd_t *pmd, unsigned long addr);
32extern int zap_huge_pud(struct mmu_gather *tlb,
33 struct vm_area_struct *vma,
34 pud_t *pud, unsigned long addr);
35extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
36 unsigned long addr, unsigned long end,
37 unsigned char *vec);
38extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
39 unsigned long new_addr, unsigned long old_end,
40 pmd_t *old_pmd, pmd_t *new_pmd, bool *need_flush);
41extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
42 unsigned long addr, pgprot_t newprot,
43 int prot_numa);
44int vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
45 pmd_t *pmd, pfn_t pfn, bool write);
46int vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
47 pud_t *pud, pfn_t pfn, bool write);
48enum transparent_hugepage_flag {
49 TRANSPARENT_HUGEPAGE_FLAG,
50 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
51 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
52 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
53 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
54 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
55 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
56 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
57#ifdef CONFIG_DEBUG_VM
58 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
59#endif
60};
61
62struct kobject;
63struct kobj_attribute;
64
65extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
66 struct kobj_attribute *attr,
67 const char *buf, size_t count,
68 enum transparent_hugepage_flag flag);
69extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
70 struct kobj_attribute *attr, char *buf,
71 enum transparent_hugepage_flag flag);
72extern struct kobj_attribute shmem_enabled_attr;
73
74#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
75#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
76
77#ifdef CONFIG_TRANSPARENT_HUGEPAGE
78#define HPAGE_PMD_SHIFT PMD_SHIFT
79#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
80#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
81
82#define HPAGE_PUD_SHIFT PUD_SHIFT
83#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
84#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
85
86extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
87
88#define transparent_hugepage_enabled(__vma) \
89 ((transparent_hugepage_flags & \
90 (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
91 (transparent_hugepage_flags & \
92 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
93 ((__vma)->vm_flags & VM_HUGEPAGE))) && \
94 !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
95 !is_vma_temporary_stack(__vma))
96#define transparent_hugepage_use_zero_page() \
97 (transparent_hugepage_flags & \
98 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
99#ifdef CONFIG_DEBUG_VM
100#define transparent_hugepage_debug_cow() \
101 (transparent_hugepage_flags & \
102 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
103#else /* CONFIG_DEBUG_VM */
104#define transparent_hugepage_debug_cow() 0
105#endif /* CONFIG_DEBUG_VM */
106
107extern unsigned long transparent_hugepage_flags;
108
109extern unsigned long thp_get_unmapped_area(struct file *filp,
110 unsigned long addr, unsigned long len, unsigned long pgoff,
111 unsigned long flags);
112
113extern void prep_transhuge_page(struct page *page);
114extern void free_transhuge_page(struct page *page);
115
116int split_huge_page_to_list(struct page *page, struct list_head *list);
117static inline int split_huge_page(struct page *page)
118{
119 return split_huge_page_to_list(page, NULL);
120}
121void deferred_split_huge_page(struct page *page);
122
123void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
124 unsigned long address, bool freeze, struct page *page);
125
126#define split_huge_pmd(__vma, __pmd, __address) \
127 do { \
128 pmd_t *____pmd = (__pmd); \
129 if (pmd_trans_huge(*____pmd) \
130 || pmd_devmap(*____pmd)) \
131 __split_huge_pmd(__vma, __pmd, __address, \
132 false, NULL); \
133 } while (0)
134
135
136void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
137 bool freeze, struct page *page);
138
139void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
140 unsigned long address);
141
142#define split_huge_pud(__vma, __pud, __address) \
143 do { \
144 pud_t *____pud = (__pud); \
145 if (pud_trans_huge(*____pud) \
146 || pud_devmap(*____pud)) \
147 __split_huge_pud(__vma, __pud, __address); \
148 } while (0)
149
150extern int hugepage_madvise(struct vm_area_struct *vma,
151 unsigned long *vm_flags, int advice);
152extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
153 unsigned long start,
154 unsigned long end,
155 long adjust_next);
156extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
157 struct vm_area_struct *vma);
158extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
159 struct vm_area_struct *vma);
160/* mmap_sem must be held on entry */
161static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
162 struct vm_area_struct *vma)
163{
164 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
165 if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
166 return __pmd_trans_huge_lock(pmd, vma);
167 else
168 return NULL;
169}
170static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
171 struct vm_area_struct *vma)
172{
173 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
174 if (pud_trans_huge(*pud) || pud_devmap(*pud))
175 return __pud_trans_huge_lock(pud, vma);
176 else
177 return NULL;
178}
179static inline int hpage_nr_pages(struct page *page)
180{
181 if (unlikely(PageTransHuge(page)))
182 return HPAGE_PMD_NR;
183 return 1;
184}
185
186struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
187 pmd_t *pmd, int flags);
188struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
189 pud_t *pud, int flags);
190
191extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
192
193extern struct page *huge_zero_page;
194
195static inline bool is_huge_zero_page(struct page *page)
196{
197 return ACCESS_ONCE(huge_zero_page) == page;
198}
199
200static inline bool is_huge_zero_pmd(pmd_t pmd)
201{
202 return is_huge_zero_page(pmd_page(pmd));
203}
204
205static inline bool is_huge_zero_pud(pud_t pud)
206{
207 return false;
208}
209
210struct page *mm_get_huge_zero_page(struct mm_struct *mm);
211void mm_put_huge_zero_page(struct mm_struct *mm);
212
213#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
214
215#else /* CONFIG_TRANSPARENT_HUGEPAGE */
216#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
217#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
218#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
219
220#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
221#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
222#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
223
224#define hpage_nr_pages(x) 1
225
226#define transparent_hugepage_enabled(__vma) 0
227
228static inline void prep_transhuge_page(struct page *page) {}
229
230#define transparent_hugepage_flags 0UL
231
232#define thp_get_unmapped_area NULL
233
234static inline int
235split_huge_page_to_list(struct page *page, struct list_head *list)
236{
237 return 0;
238}
239static inline int split_huge_page(struct page *page)
240{
241 return 0;
242}
243static inline void deferred_split_huge_page(struct page *page) {}
244#define split_huge_pmd(__vma, __pmd, __address) \
245 do { } while (0)
246
247static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
248 unsigned long address, bool freeze, struct page *page) {}
249static inline void split_huge_pmd_address(struct vm_area_struct *vma,
250 unsigned long address, bool freeze, struct page *page) {}
251
252#define split_huge_pud(__vma, __pmd, __address) \
253 do { } while (0)
254
255static inline int hugepage_madvise(struct vm_area_struct *vma,
256 unsigned long *vm_flags, int advice)
257{
258 BUG();
259 return 0;
260}
261static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
262 unsigned long start,
263 unsigned long end,
264 long adjust_next)
265{
266}
267static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
268 struct vm_area_struct *vma)
269{
270 return NULL;
271}
272static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
273 struct vm_area_struct *vma)
274{
275 return NULL;
276}
277
278static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd)
279{
280 return 0;
281}
282
283static inline bool is_huge_zero_page(struct page *page)
284{
285 return false;
286}
287
288static inline bool is_huge_zero_pud(pud_t pud)
289{
290 return false;
291}
292
293static inline void mm_put_huge_zero_page(struct mm_struct *mm)
294{
295 return;
296}
297
298static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
299 unsigned long addr, pmd_t *pmd, int flags)
300{
301 return NULL;
302}
303
304static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
305 unsigned long addr, pud_t *pud, int flags)
306{
307 return NULL;
308}
309#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
310
311#endif /* _LINUX_HUGE_MM_H */