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,
49 unsigned long cp_flags);
50 vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn,
51 pgprot_t pgprot, bool write);
54 * vmf_insert_pfn_pmd - insert a pmd size pfn
55 * @vmf: Structure describing the fault
57 * @pgprot: page protection to use
58 * @write: whether it's a write fault
60 * Insert a pmd size pfn. See vmf_insert_pfn() for additional info.
62 * Return: vm_fault_t value.
64 static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn,
67 return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
69 vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn,
70 pgprot_t pgprot, bool write);
73 * vmf_insert_pfn_pud - insert a pud size pfn
74 * @vmf: Structure describing the fault
76 * @pgprot: page protection to use
77 * @write: whether it's a write fault
79 * Insert a pud size pfn. See vmf_insert_pfn() for additional info.
81 * Return: vm_fault_t value.
83 static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn,
86 return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
89 enum transparent_hugepage_flag {
90 TRANSPARENT_HUGEPAGE_FLAG,
91 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
92 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
93 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
94 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
95 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
96 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
97 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
98 #ifdef CONFIG_DEBUG_VM
99 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
104 struct kobj_attribute;
106 extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
107 struct kobj_attribute *attr,
108 const char *buf, size_t count,
109 enum transparent_hugepage_flag flag);
110 extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
111 struct kobj_attribute *attr, char *buf,
112 enum transparent_hugepage_flag flag);
113 extern struct kobj_attribute shmem_enabled_attr;
115 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
116 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
118 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
119 #define HPAGE_PMD_SHIFT PMD_SHIFT
120 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
121 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
123 #define HPAGE_PUD_SHIFT PUD_SHIFT
124 #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
125 #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
127 extern unsigned long transparent_hugepage_flags;
130 * to be used on vmas which are known to support THP.
131 * Use transparent_hugepage_enabled otherwise
133 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
135 if (vma->vm_flags & VM_NOHUGEPAGE)
138 if (vma_is_temporary_stack(vma))
141 if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
144 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
147 * For dax vmas, try to always use hugepage mappings. If the kernel does
148 * not support hugepages, fsdax mappings will fallback to PAGE_SIZE
149 * mappings, and device-dax namespaces, that try to guarantee a given
150 * mapping size, will fail to enable
155 if (transparent_hugepage_flags &
156 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
157 return !!(vma->vm_flags & VM_HUGEPAGE);
162 bool transparent_hugepage_enabled(struct vm_area_struct *vma);
164 #define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
166 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
169 /* Don't have to check pgoff for anonymous vma */
170 if (!vma_is_anonymous(vma)) {
171 if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
172 (vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
176 if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
181 #define transparent_hugepage_use_zero_page() \
182 (transparent_hugepage_flags & \
183 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
184 #ifdef CONFIG_DEBUG_VM
185 #define transparent_hugepage_debug_cow() \
186 (transparent_hugepage_flags & \
187 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
188 #else /* CONFIG_DEBUG_VM */
189 #define transparent_hugepage_debug_cow() 0
190 #endif /* CONFIG_DEBUG_VM */
192 extern unsigned long thp_get_unmapped_area(struct file *filp,
193 unsigned long addr, unsigned long len, unsigned long pgoff,
194 unsigned long flags);
196 extern void prep_transhuge_page(struct page *page);
197 extern void free_transhuge_page(struct page *page);
198 bool is_transparent_hugepage(struct page *page);
200 bool can_split_huge_page(struct page *page, int *pextra_pins);
201 int split_huge_page_to_list(struct page *page, struct list_head *list);
202 static inline int split_huge_page(struct page *page)
204 return split_huge_page_to_list(page, NULL);
206 void deferred_split_huge_page(struct page *page);
208 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
209 unsigned long address, bool freeze, struct page *page);
211 #define split_huge_pmd(__vma, __pmd, __address) \
213 pmd_t *____pmd = (__pmd); \
214 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
215 || pmd_devmap(*____pmd)) \
216 __split_huge_pmd(__vma, __pmd, __address, \
221 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
222 bool freeze, struct page *page);
224 void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
225 unsigned long address);
227 #define split_huge_pud(__vma, __pud, __address) \
229 pud_t *____pud = (__pud); \
230 if (pud_trans_huge(*____pud) \
231 || pud_devmap(*____pud)) \
232 __split_huge_pud(__vma, __pud, __address); \
235 extern int hugepage_madvise(struct vm_area_struct *vma,
236 unsigned long *vm_flags, int advice);
237 extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
241 extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
242 struct vm_area_struct *vma);
243 extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
244 struct vm_area_struct *vma);
246 static inline int is_swap_pmd(pmd_t pmd)
248 return !pmd_none(pmd) && !pmd_present(pmd);
251 /* mmap_lock must be held on entry */
252 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
253 struct vm_area_struct *vma)
255 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
256 return __pmd_trans_huge_lock(pmd, vma);
260 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
261 struct vm_area_struct *vma)
263 if (pud_trans_huge(*pud) || pud_devmap(*pud))
264 return __pud_trans_huge_lock(pud, vma);
268 static inline int hpage_nr_pages(struct page *page)
270 if (unlikely(PageTransHuge(page)))
275 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
276 pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
277 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
278 pud_t *pud, int flags, struct dev_pagemap **pgmap);
280 extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
282 extern struct page *huge_zero_page;
284 static inline bool is_huge_zero_page(struct page *page)
286 return READ_ONCE(huge_zero_page) == page;
289 static inline bool is_huge_zero_pmd(pmd_t pmd)
291 return is_huge_zero_page(pmd_page(pmd));
294 static inline bool is_huge_zero_pud(pud_t pud)
299 struct page *mm_get_huge_zero_page(struct mm_struct *mm);
300 void mm_put_huge_zero_page(struct mm_struct *mm);
302 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
304 static inline bool thp_migration_supported(void)
306 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
309 static inline struct list_head *page_deferred_list(struct page *page)
312 * Global or memcg deferred list in the second tail pages is
313 * occupied by compound_head.
315 return &page[2].deferred_list;
318 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
319 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
320 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
321 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
323 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
324 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
325 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
327 static inline int hpage_nr_pages(struct page *page)
329 VM_BUG_ON_PAGE(PageTail(page), page);
333 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
338 static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
343 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
349 static inline void prep_transhuge_page(struct page *page) {}
351 static inline bool is_transparent_hugepage(struct page *page)
356 #define transparent_hugepage_flags 0UL
358 #define thp_get_unmapped_area NULL
361 can_split_huge_page(struct page *page, int *pextra_pins)
367 split_huge_page_to_list(struct page *page, struct list_head *list)
371 static inline int split_huge_page(struct page *page)
375 static inline void deferred_split_huge_page(struct page *page) {}
376 #define split_huge_pmd(__vma, __pmd, __address) \
379 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
380 unsigned long address, bool freeze, struct page *page) {}
381 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
382 unsigned long address, bool freeze, struct page *page) {}
384 #define split_huge_pud(__vma, __pmd, __address) \
387 static inline int hugepage_madvise(struct vm_area_struct *vma,
388 unsigned long *vm_flags, int advice)
393 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
399 static inline int is_swap_pmd(pmd_t pmd)
403 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
404 struct vm_area_struct *vma)
408 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
409 struct vm_area_struct *vma)
414 static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
420 static inline bool is_huge_zero_page(struct page *page)
425 static inline bool is_huge_zero_pud(pud_t pud)
430 static inline void mm_put_huge_zero_page(struct mm_struct *mm)
435 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
436 unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
441 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
442 unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
447 static inline bool thp_migration_supported(void)
451 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
453 #endif /* _LINUX_HUGE_MM_H */