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>
6 #include <linux/mm_types.h>
8 #include <linux/fs.h> /* only for vma_is_dax() */
10 extern vm_fault_t
do_huge_pmd_anonymous_page(struct vm_fault
*vmf
);
11 extern int copy_huge_pmd(struct mm_struct
*dst_mm
, struct mm_struct
*src_mm
,
12 pmd_t
*dst_pmd
, pmd_t
*src_pmd
, unsigned long addr
,
13 struct vm_area_struct
*vma
);
14 extern void huge_pmd_set_accessed(struct vm_fault
*vmf
, pmd_t orig_pmd
);
15 extern int copy_huge_pud(struct mm_struct
*dst_mm
, struct mm_struct
*src_mm
,
16 pud_t
*dst_pud
, pud_t
*src_pud
, unsigned long addr
,
17 struct vm_area_struct
*vma
);
19 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
20 extern void huge_pud_set_accessed(struct vm_fault
*vmf
, pud_t orig_pud
);
22 static inline void huge_pud_set_accessed(struct vm_fault
*vmf
, pud_t orig_pud
)
27 extern vm_fault_t
do_huge_pmd_wp_page(struct vm_fault
*vmf
, pmd_t orig_pmd
);
28 extern struct page
*follow_trans_huge_pmd(struct vm_area_struct
*vma
,
32 extern bool madvise_free_huge_pmd(struct mmu_gather
*tlb
,
33 struct vm_area_struct
*vma
,
34 pmd_t
*pmd
, unsigned long addr
, unsigned long next
);
35 extern int zap_huge_pmd(struct mmu_gather
*tlb
,
36 struct vm_area_struct
*vma
,
37 pmd_t
*pmd
, unsigned long addr
);
38 extern int zap_huge_pud(struct mmu_gather
*tlb
,
39 struct vm_area_struct
*vma
,
40 pud_t
*pud
, unsigned long addr
);
41 extern int mincore_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
42 unsigned long addr
, unsigned long end
,
44 extern bool move_huge_pmd(struct vm_area_struct
*vma
, unsigned long old_addr
,
45 unsigned long new_addr
, unsigned long old_end
,
46 pmd_t
*old_pmd
, pmd_t
*new_pmd
);
47 extern int change_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
48 unsigned long addr
, pgprot_t newprot
,
50 vm_fault_t
vmf_insert_pfn_pmd(struct vm_fault
*vmf
, pfn_t pfn
, bool write
);
51 vm_fault_t
vmf_insert_pfn_pud(struct vm_fault
*vmf
, 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
;
95 * to be used on vmas which are known to support THP.
96 * Use transparent_hugepage_enabled otherwise
98 static inline bool __transparent_hugepage_enabled(struct vm_area_struct
*vma
)
100 if (vma
->vm_flags
& VM_NOHUGEPAGE
)
103 if (is_vma_temporary_stack(vma
))
106 if (test_bit(MMF_DISABLE_THP
, &vma
->vm_mm
->flags
))
109 if (transparent_hugepage_flags
& (1 << TRANSPARENT_HUGEPAGE_FLAG
))
115 if (transparent_hugepage_flags
&
116 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG
))
117 return !!(vma
->vm_flags
& VM_HUGEPAGE
);
122 bool transparent_hugepage_enabled(struct vm_area_struct
*vma
);
124 #define transparent_hugepage_use_zero_page() \
125 (transparent_hugepage_flags & \
126 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
127 #ifdef CONFIG_DEBUG_VM
128 #define transparent_hugepage_debug_cow() \
129 (transparent_hugepage_flags & \
130 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
131 #else /* CONFIG_DEBUG_VM */
132 #define transparent_hugepage_debug_cow() 0
133 #endif /* CONFIG_DEBUG_VM */
135 extern unsigned long thp_get_unmapped_area(struct file
*filp
,
136 unsigned long addr
, unsigned long len
, unsigned long pgoff
,
137 unsigned long flags
);
139 extern void prep_transhuge_page(struct page
*page
);
140 extern void free_transhuge_page(struct page
*page
);
142 bool can_split_huge_page(struct page
*page
, int *pextra_pins
);
143 int split_huge_page_to_list(struct page
*page
, struct list_head
*list
);
144 static inline int split_huge_page(struct page
*page
)
146 return split_huge_page_to_list(page
, NULL
);
148 void deferred_split_huge_page(struct page
*page
);
150 void __split_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
151 unsigned long address
, bool freeze
, struct page
*page
);
153 #define split_huge_pmd(__vma, __pmd, __address) \
155 pmd_t *____pmd = (__pmd); \
156 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
157 || pmd_devmap(*____pmd)) \
158 __split_huge_pmd(__vma, __pmd, __address, \
163 void split_huge_pmd_address(struct vm_area_struct
*vma
, unsigned long address
,
164 bool freeze
, struct page
*page
);
166 void __split_huge_pud(struct vm_area_struct
*vma
, pud_t
*pud
,
167 unsigned long address
);
169 #define split_huge_pud(__vma, __pud, __address) \
171 pud_t *____pud = (__pud); \
172 if (pud_trans_huge(*____pud) \
173 || pud_devmap(*____pud)) \
174 __split_huge_pud(__vma, __pud, __address); \
177 extern int hugepage_madvise(struct vm_area_struct
*vma
,
178 unsigned long *vm_flags
, int advice
);
179 extern void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
183 extern spinlock_t
*__pmd_trans_huge_lock(pmd_t
*pmd
,
184 struct vm_area_struct
*vma
);
185 extern spinlock_t
*__pud_trans_huge_lock(pud_t
*pud
,
186 struct vm_area_struct
*vma
);
188 static inline int is_swap_pmd(pmd_t pmd
)
190 return !pmd_none(pmd
) && !pmd_present(pmd
);
193 /* mmap_sem must be held on entry */
194 static inline spinlock_t
*pmd_trans_huge_lock(pmd_t
*pmd
,
195 struct vm_area_struct
*vma
)
197 VM_BUG_ON_VMA(!rwsem_is_locked(&vma
->vm_mm
->mmap_sem
), vma
);
198 if (is_swap_pmd(*pmd
) || pmd_trans_huge(*pmd
) || pmd_devmap(*pmd
))
199 return __pmd_trans_huge_lock(pmd
, vma
);
203 static inline spinlock_t
*pud_trans_huge_lock(pud_t
*pud
,
204 struct vm_area_struct
*vma
)
206 VM_BUG_ON_VMA(!rwsem_is_locked(&vma
->vm_mm
->mmap_sem
), vma
);
207 if (pud_trans_huge(*pud
) || pud_devmap(*pud
))
208 return __pud_trans_huge_lock(pud
, vma
);
212 static inline int hpage_nr_pages(struct page
*page
)
214 if (unlikely(PageTransHuge(page
)))
219 struct page
*follow_devmap_pmd(struct vm_area_struct
*vma
, unsigned long addr
,
220 pmd_t
*pmd
, int flags
, struct dev_pagemap
**pgmap
);
221 struct page
*follow_devmap_pud(struct vm_area_struct
*vma
, unsigned long addr
,
222 pud_t
*pud
, int flags
, struct dev_pagemap
**pgmap
);
224 extern vm_fault_t
do_huge_pmd_numa_page(struct vm_fault
*vmf
, pmd_t orig_pmd
);
226 extern struct page
*huge_zero_page
;
228 static inline bool is_huge_zero_page(struct page
*page
)
230 return READ_ONCE(huge_zero_page
) == page
;
233 static inline bool is_huge_zero_pmd(pmd_t pmd
)
235 return is_huge_zero_page(pmd_page(pmd
));
238 static inline bool is_huge_zero_pud(pud_t pud
)
243 struct page
*mm_get_huge_zero_page(struct mm_struct
*mm
);
244 void mm_put_huge_zero_page(struct mm_struct
*mm
);
246 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
248 static inline bool thp_migration_supported(void)
250 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION
);
253 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
254 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
255 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
256 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
258 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
259 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
260 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
262 #define hpage_nr_pages(x) 1
264 static inline bool __transparent_hugepage_enabled(struct vm_area_struct
*vma
)
269 static inline bool transparent_hugepage_enabled(struct vm_area_struct
*vma
)
274 static inline void prep_transhuge_page(struct page
*page
) {}
276 #define transparent_hugepage_flags 0UL
278 #define thp_get_unmapped_area NULL
281 can_split_huge_page(struct page
*page
, int *pextra_pins
)
287 split_huge_page_to_list(struct page
*page
, struct list_head
*list
)
291 static inline int split_huge_page(struct page
*page
)
295 static inline void deferred_split_huge_page(struct page
*page
) {}
296 #define split_huge_pmd(__vma, __pmd, __address) \
299 static inline void __split_huge_pmd(struct vm_area_struct
*vma
, pmd_t
*pmd
,
300 unsigned long address
, bool freeze
, struct page
*page
) {}
301 static inline void split_huge_pmd_address(struct vm_area_struct
*vma
,
302 unsigned long address
, bool freeze
, struct page
*page
) {}
304 #define split_huge_pud(__vma, __pmd, __address) \
307 static inline int hugepage_madvise(struct vm_area_struct
*vma
,
308 unsigned long *vm_flags
, int advice
)
313 static inline void vma_adjust_trans_huge(struct vm_area_struct
*vma
,
319 static inline int is_swap_pmd(pmd_t pmd
)
323 static inline spinlock_t
*pmd_trans_huge_lock(pmd_t
*pmd
,
324 struct vm_area_struct
*vma
)
328 static inline spinlock_t
*pud_trans_huge_lock(pud_t
*pud
,
329 struct vm_area_struct
*vma
)
334 static inline vm_fault_t
do_huge_pmd_numa_page(struct vm_fault
*vmf
,
340 static inline bool is_huge_zero_page(struct page
*page
)
345 static inline bool is_huge_zero_pud(pud_t pud
)
350 static inline void mm_put_huge_zero_page(struct mm_struct
*mm
)
355 static inline struct page
*follow_devmap_pmd(struct vm_area_struct
*vma
,
356 unsigned long addr
, pmd_t
*pmd
, int flags
, struct dev_pagemap
**pgmap
)
361 static inline struct page
*follow_devmap_pud(struct vm_area_struct
*vma
,
362 unsigned long addr
, pud_t
*pud
, int flags
, struct dev_pagemap
**pgmap
)
367 static inline bool thp_migration_supported(void)
371 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
373 #endif /* _LINUX_HUGE_MM_H */