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 (is_swap_pmd(*____pmd) || 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);
182 static inline int is_swap_pmd(pmd_t pmd)
184 return !pmd_none(pmd) && !pmd_present(pmd);
187 /* mmap_sem must be held on entry */
188 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
189 struct vm_area_struct *vma)
191 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
192 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
193 return __pmd_trans_huge_lock(pmd, vma);
197 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
198 struct vm_area_struct *vma)
200 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
201 if (pud_trans_huge(*pud) || pud_devmap(*pud))
202 return __pud_trans_huge_lock(pud, vma);
206 static inline int hpage_nr_pages(struct page *page)
208 if (unlikely(PageTransHuge(page)))
213 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
214 pmd_t *pmd, int flags);
215 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
216 pud_t *pud, int flags);
218 extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
220 extern struct page *huge_zero_page;
222 static inline bool is_huge_zero_page(struct page *page)
224 return ACCESS_ONCE(huge_zero_page) == page;
227 static inline bool is_huge_zero_pmd(pmd_t pmd)
229 return is_huge_zero_page(pmd_page(pmd));
232 static inline bool is_huge_zero_pud(pud_t pud)
237 struct page *mm_get_huge_zero_page(struct mm_struct *mm);
238 void mm_put_huge_zero_page(struct mm_struct *mm);
240 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
242 static inline bool thp_migration_supported(void)
244 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
247 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
248 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
249 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
250 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
252 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
253 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
254 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
256 #define hpage_nr_pages(x) 1
258 static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
263 static inline void prep_transhuge_page(struct page *page) {}
265 #define transparent_hugepage_flags 0UL
267 #define thp_get_unmapped_area NULL
270 can_split_huge_page(struct page *page, int *pextra_pins)
276 split_huge_page_to_list(struct page *page, struct list_head *list)
280 static inline int split_huge_page(struct page *page)
284 static inline void deferred_split_huge_page(struct page *page) {}
285 #define split_huge_pmd(__vma, __pmd, __address) \
288 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
289 unsigned long address, bool freeze, struct page *page) {}
290 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
291 unsigned long address, bool freeze, struct page *page) {}
293 #define split_huge_pud(__vma, __pmd, __address) \
296 static inline int hugepage_madvise(struct vm_area_struct *vma,
297 unsigned long *vm_flags, int advice)
302 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
308 static inline int is_swap_pmd(pmd_t pmd)
312 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
313 struct vm_area_struct *vma)
317 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
318 struct vm_area_struct *vma)
323 static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd)
328 static inline bool is_huge_zero_page(struct page *page)
333 static inline bool is_huge_zero_pud(pud_t pud)
338 static inline void mm_put_huge_zero_page(struct mm_struct *mm)
343 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
344 unsigned long addr, pmd_t *pmd, int flags)
349 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
350 unsigned long addr, pud_t *pud, int flags)
355 static inline bool thp_migration_supported(void)
359 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
361 #endif /* _LINUX_HUGE_MM_H */