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 vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
11 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 void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
15 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 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 vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
28 struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
29 unsigned long addr, pmd_t *pmd,
31 bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
32 pmd_t *pmd, unsigned long addr, unsigned long next);
33 int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd,
35 int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud,
37 bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
38 unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd);
39 int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr,
40 pgprot_t newprot, unsigned long cp_flags);
41 vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn,
42 pgprot_t pgprot, bool write);
45 * vmf_insert_pfn_pmd - insert a pmd size pfn
46 * @vmf: Structure describing the fault
48 * @pgprot: page protection to use
49 * @write: whether it's a write fault
51 * Insert a pmd size pfn. See vmf_insert_pfn() for additional info.
53 * Return: vm_fault_t value.
55 static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn,
58 return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
60 vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn,
61 pgprot_t pgprot, bool write);
64 * vmf_insert_pfn_pud - insert a pud size pfn
65 * @vmf: Structure describing the fault
67 * @pgprot: page protection to use
68 * @write: whether it's a write fault
70 * Insert a pud size pfn. See vmf_insert_pfn() for additional info.
72 * Return: vm_fault_t value.
74 static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn,
77 return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
80 enum transparent_hugepage_flag {
81 TRANSPARENT_HUGEPAGE_FLAG,
82 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
83 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
84 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
85 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
86 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
87 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
88 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
89 #ifdef CONFIG_DEBUG_VM
90 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
95 struct kobj_attribute;
97 ssize_t single_hugepage_flag_store(struct kobject *kobj,
98 struct kobj_attribute *attr,
99 const char *buf, size_t count,
100 enum transparent_hugepage_flag flag);
101 ssize_t single_hugepage_flag_show(struct kobject *kobj,
102 struct kobj_attribute *attr, char *buf,
103 enum transparent_hugepage_flag flag);
104 extern struct kobj_attribute shmem_enabled_attr;
106 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
107 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
109 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
110 #define HPAGE_PMD_SHIFT PMD_SHIFT
111 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
112 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
114 #define HPAGE_PUD_SHIFT PUD_SHIFT
115 #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
116 #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
118 extern unsigned long transparent_hugepage_flags;
121 * to be used on vmas which are known to support THP.
122 * Use transparent_hugepage_enabled otherwise
124 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
126 if (vma->vm_flags & VM_NOHUGEPAGE)
129 if (vma_is_temporary_stack(vma))
132 if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
135 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
138 * For dax vmas, try to always use hugepage mappings. If the kernel does
139 * not support hugepages, fsdax mappings will fallback to PAGE_SIZE
140 * mappings, and device-dax namespaces, that try to guarantee a given
141 * mapping size, will fail to enable
146 if (transparent_hugepage_flags &
147 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
148 return !!(vma->vm_flags & VM_HUGEPAGE);
153 bool transparent_hugepage_enabled(struct vm_area_struct *vma);
155 #define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
157 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
160 /* Don't have to check pgoff for anonymous vma */
161 if (!vma_is_anonymous(vma)) {
162 if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
163 (vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
167 if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
172 #define transparent_hugepage_use_zero_page() \
173 (transparent_hugepage_flags & \
174 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
176 unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
177 unsigned long len, unsigned long pgoff, unsigned long flags);
179 void prep_transhuge_page(struct page *page);
180 void free_transhuge_page(struct page *page);
181 bool is_transparent_hugepage(struct page *page);
183 bool can_split_huge_page(struct page *page, int *pextra_pins);
184 int split_huge_page_to_list(struct page *page, struct list_head *list);
185 static inline int split_huge_page(struct page *page)
187 return split_huge_page_to_list(page, NULL);
189 void deferred_split_huge_page(struct page *page);
191 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
192 unsigned long address, bool freeze, struct page *page);
194 #define split_huge_pmd(__vma, __pmd, __address) \
196 pmd_t *____pmd = (__pmd); \
197 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
198 || pmd_devmap(*____pmd)) \
199 __split_huge_pmd(__vma, __pmd, __address, \
204 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
205 bool freeze, struct page *page);
207 void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
208 unsigned long address);
210 #define split_huge_pud(__vma, __pud, __address) \
212 pud_t *____pud = (__pud); \
213 if (pud_trans_huge(*____pud) \
214 || pud_devmap(*____pud)) \
215 __split_huge_pud(__vma, __pud, __address); \
218 int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags,
220 void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
221 unsigned long end, long adjust_next);
222 spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma);
223 spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma);
225 static inline int is_swap_pmd(pmd_t pmd)
227 return !pmd_none(pmd) && !pmd_present(pmd);
230 /* mmap_lock must be held on entry */
231 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
232 struct vm_area_struct *vma)
234 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
235 return __pmd_trans_huge_lock(pmd, vma);
239 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
240 struct vm_area_struct *vma)
242 if (pud_trans_huge(*pud) || pud_devmap(*pud))
243 return __pud_trans_huge_lock(pud, vma);
249 * thp_head - Head page of a transparent huge page.
250 * @page: Any page (tail, head or regular) found in the page cache.
252 static inline struct page *thp_head(struct page *page)
254 return compound_head(page);
258 * thp_order - Order of a transparent huge page.
259 * @page: Head page of a transparent huge page.
261 static inline unsigned int thp_order(struct page *page)
263 VM_BUG_ON_PGFLAGS(PageTail(page), page);
265 return HPAGE_PMD_ORDER;
270 * thp_nr_pages - The number of regular pages in this huge page.
271 * @page: The head page of a huge page.
273 static inline int thp_nr_pages(struct page *page)
275 VM_BUG_ON_PGFLAGS(PageTail(page), page);
281 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
282 pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
283 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
284 pud_t *pud, int flags, struct dev_pagemap **pgmap);
286 vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
288 extern struct page *huge_zero_page;
290 static inline bool is_huge_zero_page(struct page *page)
292 return READ_ONCE(huge_zero_page) == page;
295 static inline bool is_huge_zero_pmd(pmd_t pmd)
297 return is_huge_zero_page(pmd_page(pmd));
300 static inline bool is_huge_zero_pud(pud_t pud)
305 struct page *mm_get_huge_zero_page(struct mm_struct *mm);
306 void mm_put_huge_zero_page(struct mm_struct *mm);
308 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
310 static inline bool thp_migration_supported(void)
312 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
315 static inline struct list_head *page_deferred_list(struct page *page)
318 * Global or memcg deferred list in the second tail pages is
319 * occupied by compound_head.
321 return &page[2].deferred_list;
324 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
325 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
326 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
327 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
329 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
330 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
331 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
333 static inline struct page *thp_head(struct page *page)
335 VM_BUG_ON_PGFLAGS(PageTail(page), page);
339 static inline unsigned int thp_order(struct page *page)
341 VM_BUG_ON_PGFLAGS(PageTail(page), page);
345 static inline int thp_nr_pages(struct page *page)
347 VM_BUG_ON_PGFLAGS(PageTail(page), page);
351 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
356 static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
361 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
367 static inline void prep_transhuge_page(struct page *page) {}
369 static inline bool is_transparent_hugepage(struct page *page)
374 #define transparent_hugepage_flags 0UL
376 #define thp_get_unmapped_area NULL
379 can_split_huge_page(struct page *page, int *pextra_pins)
385 split_huge_page_to_list(struct page *page, struct list_head *list)
389 static inline int split_huge_page(struct page *page)
393 static inline void deferred_split_huge_page(struct page *page) {}
394 #define split_huge_pmd(__vma, __pmd, __address) \
397 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
398 unsigned long address, bool freeze, struct page *page) {}
399 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
400 unsigned long address, bool freeze, struct page *page) {}
402 #define split_huge_pud(__vma, __pmd, __address) \
405 static inline int hugepage_madvise(struct vm_area_struct *vma,
406 unsigned long *vm_flags, int advice)
411 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
417 static inline int is_swap_pmd(pmd_t pmd)
421 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
422 struct vm_area_struct *vma)
426 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
427 struct vm_area_struct *vma)
432 static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
438 static inline bool is_huge_zero_page(struct page *page)
443 static inline bool is_huge_zero_pud(pud_t pud)
448 static inline void mm_put_huge_zero_page(struct mm_struct *mm)
453 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
454 unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
459 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
460 unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
465 static inline bool thp_migration_supported(void)
469 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
472 * thp_size - Size of a transparent huge page.
473 * @page: Head page of a transparent huge page.
475 * Return: Number of bytes in this page.
477 static inline unsigned long thp_size(struct page *page)
479 return PAGE_SIZE << thp_order(page);
482 #endif /* _LINUX_HUGE_MM_H */