1 #ifndef _LINUX_HUGE_MM_H
2 #define _LINUX_HUGE_MM_H
4 #include <linux/sched/coredump.h>
6 #include <linux/fs.h> /* only for vma_is_dax() */
8 extern int do_huge_pmd_anonymous_page(struct vm_fault
*vmf
);
9 extern int copy_huge_pmd(struct mm_struct
*dst_mm
, struct mm_struct
*src_mm
,
10 pmd_t
*dst_pmd
, pmd_t
*src_pmd
, unsigned long addr
,
11 struct vm_area_struct
*vma
);
12 extern void huge_pmd_set_accessed(struct vm_fault
*vmf
, pmd_t orig_pmd
);
13 extern int copy_huge_pud(struct mm_struct
*dst_mm
, struct mm_struct
*src_mm
,
14 pud_t
*dst_pud
, pud_t
*src_pud
, unsigned long addr
,
15 struct vm_area_struct
*vma
);
17 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
18 extern void huge_pud_set_accessed(struct vm_fault
*vmf
, pud_t orig_pud
);
20 static inline void huge_pud_set_accessed(struct vm_fault
*vmf
, pud_t orig_pud
)
25 extern int do_huge_pmd_wp_page(struct vm_fault
*vmf
, pmd_t orig_pmd
);
26 extern struct page
*follow_trans_huge_pmd(struct vm_area_struct
*vma
,
30 extern bool madvise_free_huge_pmd(struct mmu_gather
*tlb
,
31 struct vm_area_struct
*vma
,
32 pmd_t
*pmd
, unsigned long addr
, unsigned long next
);
33 extern int zap_huge_pmd(struct mmu_gather
*tlb
,
34 struct vm_area_struct
*vma
,
35 pmd_t
*pmd
, unsigned long addr
);
36 extern int zap_huge_pud(struct mmu_gather
*tlb
,
37 struct vm_area_struct
*vma
,
38 pud_t
*pud
, unsigned long addr
);
39 extern int mincore_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
40 unsigned long addr
, unsigned long end
,
42 extern bool move_huge_pmd(struct vm_area_struct
*vma
, unsigned long old_addr
,
43 unsigned long new_addr
, unsigned long old_end
,
44 pmd_t
*old_pmd
, pmd_t
*new_pmd
, bool *need_flush
);
45 extern int change_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
46 unsigned long addr
, pgprot_t newprot
,
48 int vmf_insert_pfn_pmd(struct vm_area_struct
*vma
, unsigned long addr
,
49 pmd_t
*pmd
, pfn_t pfn
, bool write
);
50 int vmf_insert_pfn_pud(struct vm_area_struct
*vma
, unsigned long addr
,
51 pud_t
*pud
, pfn_t pfn
, bool write
);
52 enum transparent_hugepage_flag
{
53 TRANSPARENT_HUGEPAGE_FLAG
,
54 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG
,
55 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG
,
56 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG
,
57 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG
,
58 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG
,
59 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG
,
60 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG
,
61 #ifdef CONFIG_DEBUG_VM
62 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG
,
67 struct kobj_attribute
;
69 extern ssize_t
single_hugepage_flag_store(struct kobject
*kobj
,
70 struct kobj_attribute
*attr
,
71 const char *buf
, size_t count
,
72 enum transparent_hugepage_flag flag
);
73 extern ssize_t
single_hugepage_flag_show(struct kobject
*kobj
,
74 struct kobj_attribute
*attr
, char *buf
,
75 enum transparent_hugepage_flag flag
);
76 extern struct kobj_attribute shmem_enabled_attr
;
78 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
79 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
81 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
82 #define HPAGE_PMD_SHIFT PMD_SHIFT
83 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
84 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
86 #define HPAGE_PUD_SHIFT PUD_SHIFT
87 #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
88 #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
90 extern bool is_vma_temporary_stack(struct vm_area_struct
*vma
);
92 extern unsigned long transparent_hugepage_flags
;
94 static inline bool transparent_hugepage_enabled(struct vm_area_struct
*vma
)
96 if (vma
->vm_flags
& VM_NOHUGEPAGE
)
99 if (is_vma_temporary_stack(vma
))
102 if (test_bit(MMF_DISABLE_THP
, &vma
->vm_mm
->flags
))
105 if (transparent_hugepage_flags
& (1 << TRANSPARENT_HUGEPAGE_FLAG
))
111 if (transparent_hugepage_flags
&
112 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG
))
113 return !!(vma
->vm_flags
& VM_HUGEPAGE
);
118 #define transparent_hugepage_use_zero_page() \
119 (transparent_hugepage_flags & \
120 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
121 #ifdef CONFIG_DEBUG_VM
122 #define transparent_hugepage_debug_cow() \
123 (transparent_hugepage_flags & \
124 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
125 #else /* CONFIG_DEBUG_VM */
126 #define transparent_hugepage_debug_cow() 0
127 #endif /* CONFIG_DEBUG_VM */
129 extern unsigned long thp_get_unmapped_area(struct file
*filp
,
130 unsigned long addr
, unsigned long len
, unsigned long pgoff
,
131 unsigned long flags
);
133 extern void prep_transhuge_page(struct page
*page
);
134 extern void free_transhuge_page(struct page
*page
);
136 bool can_split_huge_page(struct page
*page
, int *pextra_pins
);
137 int split_huge_page_to_list(struct page
*page
, struct list_head
*list
);
138 static inline int split_huge_page(struct page
*page
)
140 return split_huge_page_to_list(page
, NULL
);
142 void deferred_split_huge_page(struct page
*page
);
144 void __split_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
145 unsigned long address
, bool freeze
, struct page
*page
);
147 #define split_huge_pmd(__vma, __pmd, __address) \
149 pmd_t *____pmd = (__pmd); \
150 if (pmd_trans_huge(*____pmd) \
151 || pmd_devmap(*____pmd)) \
152 __split_huge_pmd(__vma, __pmd, __address, \
157 void split_huge_pmd_address(struct vm_area_struct
*vma
, unsigned long address
,
158 bool freeze
, struct page
*page
);
160 void __split_huge_pud(struct vm_area_struct
*vma
, pud_t
*pud
,
161 unsigned long address
);
163 #define split_huge_pud(__vma, __pud, __address) \
165 pud_t *____pud = (__pud); \
166 if (pud_trans_huge(*____pud) \
167 || pud_devmap(*____pud)) \
168 __split_huge_pud(__vma, __pud, __address); \
171 extern int hugepage_madvise(struct vm_area_struct
*vma
,
172 unsigned long *vm_flags
, int advice
);
173 extern void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
177 extern spinlock_t
*__pmd_trans_huge_lock(pmd_t
*pmd
,
178 struct vm_area_struct
*vma
);
179 extern spinlock_t
*__pud_trans_huge_lock(pud_t
*pud
,
180 struct vm_area_struct
*vma
);
181 /* mmap_sem must be held on entry */
182 static inline spinlock_t
*pmd_trans_huge_lock(pmd_t
*pmd
,
183 struct vm_area_struct
*vma
)
185 VM_BUG_ON_VMA(!rwsem_is_locked(&vma
->vm_mm
->mmap_sem
), vma
);
186 if (pmd_trans_huge(*pmd
) || pmd_devmap(*pmd
))
187 return __pmd_trans_huge_lock(pmd
, vma
);
191 static inline spinlock_t
*pud_trans_huge_lock(pud_t
*pud
,
192 struct vm_area_struct
*vma
)
194 VM_BUG_ON_VMA(!rwsem_is_locked(&vma
->vm_mm
->mmap_sem
), vma
);
195 if (pud_trans_huge(*pud
) || pud_devmap(*pud
))
196 return __pud_trans_huge_lock(pud
, vma
);
200 static inline int hpage_nr_pages(struct page
*page
)
202 if (unlikely(PageTransHuge(page
)))
207 struct page
*follow_devmap_pmd(struct vm_area_struct
*vma
, unsigned long addr
,
208 pmd_t
*pmd
, int flags
);
209 struct page
*follow_devmap_pud(struct vm_area_struct
*vma
, unsigned long addr
,
210 pud_t
*pud
, int flags
);
212 extern int do_huge_pmd_numa_page(struct vm_fault
*vmf
, pmd_t orig_pmd
);
214 extern struct page
*huge_zero_page
;
216 static inline bool is_huge_zero_page(struct page
*page
)
218 return ACCESS_ONCE(huge_zero_page
) == page
;
221 static inline bool is_huge_zero_pmd(pmd_t pmd
)
223 return is_huge_zero_page(pmd_page(pmd
));
226 static inline bool is_huge_zero_pud(pud_t pud
)
231 struct page
*mm_get_huge_zero_page(struct mm_struct
*mm
);
232 void mm_put_huge_zero_page(struct mm_struct
*mm
);
234 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
236 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
237 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
238 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
239 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
241 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
242 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
243 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
245 #define hpage_nr_pages(x) 1
247 static inline bool transparent_hugepage_enabled(struct vm_area_struct
*vma
)
252 static inline void prep_transhuge_page(struct page
*page
) {}
254 #define transparent_hugepage_flags 0UL
256 #define thp_get_unmapped_area NULL
259 can_split_huge_page(struct page
*page
, int *pextra_pins
)
265 split_huge_page_to_list(struct page
*page
, struct list_head
*list
)
269 static inline int split_huge_page(struct page
*page
)
273 static inline void deferred_split_huge_page(struct page
*page
) {}
274 #define split_huge_pmd(__vma, __pmd, __address) \
277 static inline void __split_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
278 unsigned long address
, bool freeze
, struct page
*page
) {}
279 static inline void split_huge_pmd_address(struct vm_area_struct
*vma
,
280 unsigned long address
, bool freeze
, struct page
*page
) {}
282 #define split_huge_pud(__vma, __pmd, __address) \
285 static inline int hugepage_madvise(struct vm_area_struct
*vma
,
286 unsigned long *vm_flags
, int advice
)
291 static inline void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
297 static inline spinlock_t
*pmd_trans_huge_lock(pmd_t
*pmd
,
298 struct vm_area_struct
*vma
)
302 static inline spinlock_t
*pud_trans_huge_lock(pud_t
*pud
,
303 struct vm_area_struct
*vma
)
308 static inline int do_huge_pmd_numa_page(struct vm_fault
*vmf
, pmd_t orig_pmd
)
313 static inline bool is_huge_zero_page(struct page
*page
)
318 static inline bool is_huge_zero_pud(pud_t pud
)
323 static inline void mm_put_huge_zero_page(struct mm_struct
*mm
)
328 static inline struct page
*follow_devmap_pmd(struct vm_area_struct
*vma
,
329 unsigned long addr
, pmd_t
*pmd
, int flags
)
334 static inline struct page
*follow_devmap_pud(struct vm_area_struct
*vma
,
335 unsigned long addr
, pud_t
*pud
, int flags
)
339 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
341 #endif /* _LINUX_HUGE_MM_H */