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 unsigned long transparent_hugepage_flags;
93 * to be used on vmas which are known to support THP.
94 * Use transparent_hugepage_enabled otherwise
96 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
98 if (vma->vm_flags & VM_NOHUGEPAGE)
101 if (vma_is_temporary_stack(vma))
104 if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
107 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
110 * For dax vmas, try to always use hugepage mappings. If the kernel does
111 * not support hugepages, fsdax mappings will fallback to PAGE_SIZE
112 * mappings, and device-dax namespaces, that try to guarantee a given
113 * mapping size, will fail to enable
118 if (transparent_hugepage_flags &
119 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
120 return !!(vma->vm_flags & VM_HUGEPAGE);
125 bool transparent_hugepage_enabled(struct vm_area_struct *vma);
127 #define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
129 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
132 /* Don't have to check pgoff for anonymous vma */
133 if (!vma_is_anonymous(vma)) {
134 if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
135 (vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
139 if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
144 #define transparent_hugepage_use_zero_page() \
145 (transparent_hugepage_flags & \
146 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
147 #ifdef CONFIG_DEBUG_VM
148 #define transparent_hugepage_debug_cow() \
149 (transparent_hugepage_flags & \
150 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
151 #else /* CONFIG_DEBUG_VM */
152 #define transparent_hugepage_debug_cow() 0
153 #endif /* CONFIG_DEBUG_VM */
155 extern unsigned long thp_get_unmapped_area(struct file *filp,
156 unsigned long addr, unsigned long len, unsigned long pgoff,
157 unsigned long flags);
159 extern void prep_transhuge_page(struct page *page);
160 extern void free_transhuge_page(struct page *page);
161 bool is_transparent_hugepage(struct page *page);
163 bool can_split_huge_page(struct page *page, int *pextra_pins);
164 int split_huge_page_to_list(struct page *page, struct list_head *list);
165 static inline int split_huge_page(struct page *page)
167 return split_huge_page_to_list(page, NULL);
169 void deferred_split_huge_page(struct page *page);
171 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
172 unsigned long address, bool freeze, struct page *page);
174 #define split_huge_pmd(__vma, __pmd, __address) \
176 pmd_t *____pmd = (__pmd); \
177 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
178 || pmd_devmap(*____pmd)) \
179 __split_huge_pmd(__vma, __pmd, __address, \
184 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
185 bool freeze, struct page *page);
187 void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
188 unsigned long address);
190 #define split_huge_pud(__vma, __pud, __address) \
192 pud_t *____pud = (__pud); \
193 if (pud_trans_huge(*____pud) \
194 || pud_devmap(*____pud)) \
195 __split_huge_pud(__vma, __pud, __address); \
198 extern int hugepage_madvise(struct vm_area_struct *vma,
199 unsigned long *vm_flags, int advice);
200 extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
204 extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
205 struct vm_area_struct *vma);
206 extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
207 struct vm_area_struct *vma);
209 static inline int is_swap_pmd(pmd_t pmd)
211 return !pmd_none(pmd) && !pmd_present(pmd);
214 /* mmap_sem must be held on entry */
215 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
216 struct vm_area_struct *vma)
218 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
219 return __pmd_trans_huge_lock(pmd, vma);
223 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
224 struct vm_area_struct *vma)
226 if (pud_trans_huge(*pud) || pud_devmap(*pud))
227 return __pud_trans_huge_lock(pud, vma);
231 static inline int hpage_nr_pages(struct page *page)
233 if (unlikely(PageTransHuge(page)))
238 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
239 pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
240 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
241 pud_t *pud, int flags, struct dev_pagemap **pgmap);
243 extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
245 extern struct page *huge_zero_page;
247 static inline bool is_huge_zero_page(struct page *page)
249 return READ_ONCE(huge_zero_page) == page;
252 static inline bool is_huge_zero_pmd(pmd_t pmd)
254 return is_huge_zero_page(pmd_page(pmd));
257 static inline bool is_huge_zero_pud(pud_t pud)
262 struct page *mm_get_huge_zero_page(struct mm_struct *mm);
263 void mm_put_huge_zero_page(struct mm_struct *mm);
265 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
267 static inline bool thp_migration_supported(void)
269 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
272 static inline struct list_head *page_deferred_list(struct page *page)
275 * Global or memcg deferred list in the second tail pages is
276 * occupied by compound_head.
278 return &page[2].deferred_list;
281 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
282 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
283 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
284 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
286 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
287 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
288 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
290 static inline int hpage_nr_pages(struct page *page)
292 VM_BUG_ON_PAGE(PageTail(page), page);
296 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
301 static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
306 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
312 static inline void prep_transhuge_page(struct page *page) {}
314 static inline bool is_transparent_hugepage(struct page *page)
319 #define transparent_hugepage_flags 0UL
321 #define thp_get_unmapped_area NULL
324 can_split_huge_page(struct page *page, int *pextra_pins)
330 split_huge_page_to_list(struct page *page, struct list_head *list)
334 static inline int split_huge_page(struct page *page)
338 static inline void deferred_split_huge_page(struct page *page) {}
339 #define split_huge_pmd(__vma, __pmd, __address) \
342 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
343 unsigned long address, bool freeze, struct page *page) {}
344 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
345 unsigned long address, bool freeze, struct page *page) {}
347 #define split_huge_pud(__vma, __pmd, __address) \
350 static inline int hugepage_madvise(struct vm_area_struct *vma,
351 unsigned long *vm_flags, int advice)
356 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
362 static inline int is_swap_pmd(pmd_t pmd)
366 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
367 struct vm_area_struct *vma)
371 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
372 struct vm_area_struct *vma)
377 static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
383 static inline bool is_huge_zero_page(struct page *page)
388 static inline bool is_huge_zero_pud(pud_t pud)
393 static inline void mm_put_huge_zero_page(struct mm_struct *mm)
398 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
399 unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
404 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
405 unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
410 static inline bool thp_migration_supported(void)
414 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
416 #endif /* _LINUX_HUGE_MM_H */