1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_HUGE_MM_H
3 #define _LINUX_HUGE_MM_H
5 #include <linux/sched/coredump.h>
7 #include <linux/fs.h> /* only for vma_is_dax() */
9 extern int do_huge_pmd_anonymous_page(struct vm_fault
*vmf
);
10 extern int copy_huge_pmd(struct mm_struct
*dst_mm
, struct mm_struct
*src_mm
,
11 pmd_t
*dst_pmd
, pmd_t
*src_pmd
, unsigned long addr
,
12 struct vm_area_struct
*vma
);
13 extern void huge_pmd_set_accessed(struct vm_fault
*vmf
, pmd_t orig_pmd
);
14 extern int copy_huge_pud(struct mm_struct
*dst_mm
, struct mm_struct
*src_mm
,
15 pud_t
*dst_pud
, pud_t
*src_pud
, unsigned long addr
,
16 struct vm_area_struct
*vma
);
18 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
19 extern void huge_pud_set_accessed(struct vm_fault
*vmf
, pud_t orig_pud
);
21 static inline void huge_pud_set_accessed(struct vm_fault
*vmf
, pud_t orig_pud
)
26 extern int do_huge_pmd_wp_page(struct vm_fault
*vmf
, pmd_t orig_pmd
);
27 extern struct page
*follow_trans_huge_pmd(struct vm_area_struct
*vma
,
31 extern bool madvise_free_huge_pmd(struct mmu_gather
*tlb
,
32 struct vm_area_struct
*vma
,
33 pmd_t
*pmd
, unsigned long addr
, unsigned long next
);
34 extern int zap_huge_pmd(struct mmu_gather
*tlb
,
35 struct vm_area_struct
*vma
,
36 pmd_t
*pmd
, unsigned long addr
);
37 extern int zap_huge_pud(struct mmu_gather
*tlb
,
38 struct vm_area_struct
*vma
,
39 pud_t
*pud
, unsigned long addr
);
40 extern int mincore_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
41 unsigned long addr
, unsigned long end
,
43 extern bool move_huge_pmd(struct vm_area_struct
*vma
, unsigned long old_addr
,
44 unsigned long new_addr
, unsigned long old_end
,
45 pmd_t
*old_pmd
, pmd_t
*new_pmd
);
46 extern int change_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
47 unsigned long addr
, pgprot_t newprot
,
49 int vmf_insert_pfn_pmd(struct vm_fault
*vmf
, pfn_t pfn
, bool write
);
50 int vmf_insert_pfn_pud(struct vm_fault
*vmf
, pfn_t pfn
, bool write
);
51 enum transparent_hugepage_flag
{
52 TRANSPARENT_HUGEPAGE_FLAG
,
53 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG
,
54 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG
,
55 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG
,
56 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG
,
57 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG
,
58 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG
,
59 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG
,
60 #ifdef CONFIG_DEBUG_VM
61 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG
,
66 struct kobj_attribute
;
68 extern ssize_t
single_hugepage_flag_store(struct kobject
*kobj
,
69 struct kobj_attribute
*attr
,
70 const char *buf
, size_t count
,
71 enum transparent_hugepage_flag flag
);
72 extern ssize_t
single_hugepage_flag_show(struct kobject
*kobj
,
73 struct kobj_attribute
*attr
, char *buf
,
74 enum transparent_hugepage_flag flag
);
75 extern struct kobj_attribute shmem_enabled_attr
;
77 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
78 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
80 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
81 #define HPAGE_PMD_SHIFT PMD_SHIFT
82 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
83 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
85 #define HPAGE_PUD_SHIFT PUD_SHIFT
86 #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
87 #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
89 extern bool is_vma_temporary_stack(struct vm_area_struct
*vma
);
91 extern unsigned long transparent_hugepage_flags
;
93 static inline bool transparent_hugepage_enabled(struct vm_area_struct
*vma
)
95 if (vma
->vm_flags
& VM_NOHUGEPAGE
)
98 if (is_vma_temporary_stack(vma
))
101 if (test_bit(MMF_DISABLE_THP
, &vma
->vm_mm
->flags
))
104 if (transparent_hugepage_flags
& (1 << TRANSPARENT_HUGEPAGE_FLAG
))
110 if (transparent_hugepage_flags
&
111 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG
))
112 return !!(vma
->vm_flags
& VM_HUGEPAGE
);
117 #define transparent_hugepage_use_zero_page() \
118 (transparent_hugepage_flags & \
119 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
120 #ifdef CONFIG_DEBUG_VM
121 #define transparent_hugepage_debug_cow() \
122 (transparent_hugepage_flags & \
123 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
124 #else /* CONFIG_DEBUG_VM */
125 #define transparent_hugepage_debug_cow() 0
126 #endif /* CONFIG_DEBUG_VM */
128 extern unsigned long thp_get_unmapped_area(struct file
*filp
,
129 unsigned long addr
, unsigned long len
, unsigned long pgoff
,
130 unsigned long flags
);
132 extern void prep_transhuge_page(struct page
*page
);
133 extern void free_transhuge_page(struct page
*page
);
135 bool can_split_huge_page(struct page
*page
, int *pextra_pins
);
136 int split_huge_page_to_list(struct page
*page
, struct list_head
*list
);
137 static inline int split_huge_page(struct page
*page
)
139 return split_huge_page_to_list(page
, NULL
);
141 void deferred_split_huge_page(struct page
*page
);
143 void __split_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
144 unsigned long address
, bool freeze
, struct page
*page
);
146 #define split_huge_pmd(__vma, __pmd, __address) \
148 pmd_t *____pmd = (__pmd); \
149 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
150 || pmd_devmap(*____pmd)) \
151 __split_huge_pmd(__vma, __pmd, __address, \
156 void split_huge_pmd_address(struct vm_area_struct
*vma
, unsigned long address
,
157 bool freeze
, struct page
*page
);
159 void __split_huge_pud(struct vm_area_struct
*vma
, pud_t
*pud
,
160 unsigned long address
);
162 #define split_huge_pud(__vma, __pud, __address) \
164 pud_t *____pud = (__pud); \
165 if (pud_trans_huge(*____pud) \
166 || pud_devmap(*____pud)) \
167 __split_huge_pud(__vma, __pud, __address); \
170 extern int hugepage_madvise(struct vm_area_struct
*vma
,
171 unsigned long *vm_flags
, int advice
);
172 extern void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
176 extern spinlock_t
*__pmd_trans_huge_lock(pmd_t
*pmd
,
177 struct vm_area_struct
*vma
);
178 extern spinlock_t
*__pud_trans_huge_lock(pud_t
*pud
,
179 struct vm_area_struct
*vma
);
181 static inline int is_swap_pmd(pmd_t pmd
)
183 return !pmd_none(pmd
) && !pmd_present(pmd
);
186 /* mmap_sem must be held on entry */
187 static inline spinlock_t
*pmd_trans_huge_lock(pmd_t
*pmd
,
188 struct vm_area_struct
*vma
)
190 VM_BUG_ON_VMA(!rwsem_is_locked(&vma
->vm_mm
->mmap_sem
), vma
);
191 if (is_swap_pmd(*pmd
) || pmd_trans_huge(*pmd
) || pmd_devmap(*pmd
))
192 return __pmd_trans_huge_lock(pmd
, vma
);
196 static inline spinlock_t
*pud_trans_huge_lock(pud_t
*pud
,
197 struct vm_area_struct
*vma
)
199 VM_BUG_ON_VMA(!rwsem_is_locked(&vma
->vm_mm
->mmap_sem
), vma
);
200 if (pud_trans_huge(*pud
) || pud_devmap(*pud
))
201 return __pud_trans_huge_lock(pud
, vma
);
205 static inline int hpage_nr_pages(struct page
*page
)
207 if (unlikely(PageTransHuge(page
)))
212 struct page
*follow_devmap_pmd(struct vm_area_struct
*vma
, unsigned long addr
,
213 pmd_t
*pmd
, int flags
);
214 struct page
*follow_devmap_pud(struct vm_area_struct
*vma
, unsigned long addr
,
215 pud_t
*pud
, int flags
);
217 extern int do_huge_pmd_numa_page(struct vm_fault
*vmf
, pmd_t orig_pmd
);
219 extern struct page
*huge_zero_page
;
221 static inline bool is_huge_zero_page(struct page
*page
)
223 return READ_ONCE(huge_zero_page
) == page
;
226 static inline bool is_huge_zero_pmd(pmd_t pmd
)
228 return is_huge_zero_page(pmd_page(pmd
));
231 static inline bool is_huge_zero_pud(pud_t pud
)
236 struct page
*mm_get_huge_zero_page(struct mm_struct
*mm
);
237 void mm_put_huge_zero_page(struct mm_struct
*mm
);
239 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
241 static inline bool thp_migration_supported(void)
243 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION
);
246 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
247 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
248 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
249 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
251 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
252 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
253 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
255 #define hpage_nr_pages(x) 1
257 static inline bool transparent_hugepage_enabled(struct vm_area_struct
*vma
)
262 static inline void prep_transhuge_page(struct page
*page
) {}
264 #define transparent_hugepage_flags 0UL
266 #define thp_get_unmapped_area NULL
269 can_split_huge_page(struct page
*page
, int *pextra_pins
)
275 split_huge_page_to_list(struct page
*page
, struct list_head
*list
)
279 static inline int split_huge_page(struct page
*page
)
283 static inline void deferred_split_huge_page(struct page
*page
) {}
284 #define split_huge_pmd(__vma, __pmd, __address) \
287 static inline void __split_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
288 unsigned long address
, bool freeze
, struct page
*page
) {}
289 static inline void split_huge_pmd_address(struct vm_area_struct
*vma
,
290 unsigned long address
, bool freeze
, struct page
*page
) {}
292 #define split_huge_pud(__vma, __pmd, __address) \
295 static inline int hugepage_madvise(struct vm_area_struct
*vma
,
296 unsigned long *vm_flags
, int advice
)
301 static inline void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
307 static inline int is_swap_pmd(pmd_t pmd
)
311 static inline spinlock_t
*pmd_trans_huge_lock(pmd_t
*pmd
,
312 struct vm_area_struct
*vma
)
316 static inline spinlock_t
*pud_trans_huge_lock(pud_t
*pud
,
317 struct vm_area_struct
*vma
)
322 static inline int do_huge_pmd_numa_page(struct vm_fault
*vmf
, pmd_t orig_pmd
)
327 static inline bool is_huge_zero_page(struct page
*page
)
332 static inline bool is_huge_zero_pud(pud_t pud
)
337 static inline void mm_put_huge_zero_page(struct mm_struct
*mm
)
342 static inline struct page
*follow_devmap_pmd(struct vm_area_struct
*vma
,
343 unsigned long addr
, pmd_t
*pmd
, int flags
)
348 static inline struct page
*follow_devmap_pud(struct vm_area_struct
*vma
,
349 unsigned long addr
, pud_t
*pud
, int flags
)
354 static inline bool thp_migration_supported(void)
358 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
360 #endif /* _LINUX_HUGE_MM_H */