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_NEVER_DAX,
82 TRANSPARENT_HUGEPAGE_FLAG,
83 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
84 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
85 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
86 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
87 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
88 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
89 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
90 #ifdef CONFIG_DEBUG_VM
91 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
96 struct kobj_attribute;
98 ssize_t single_hugepage_flag_store(struct kobject *kobj,
99 struct kobj_attribute *attr,
100 const char *buf, size_t count,
101 enum transparent_hugepage_flag flag);
102 ssize_t single_hugepage_flag_show(struct kobject *kobj,
103 struct kobj_attribute *attr, char *buf,
104 enum transparent_hugepage_flag flag);
105 extern struct kobj_attribute shmem_enabled_attr;
107 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
108 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
110 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
111 #define HPAGE_PMD_SHIFT PMD_SHIFT
112 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
113 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
115 #define HPAGE_PUD_SHIFT PUD_SHIFT
116 #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
117 #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
119 extern unsigned long transparent_hugepage_flags;
122 * to be used on vmas which are known to support THP.
123 * Use transparent_hugepage_enabled otherwise
125 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
129 * If the hardware/firmware marked hugepage support disabled.
131 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX))
134 if (vma->vm_flags & VM_NOHUGEPAGE)
137 if (vma_is_temporary_stack(vma))
140 if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
143 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
149 if (transparent_hugepage_flags &
150 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
151 return !!(vma->vm_flags & VM_HUGEPAGE);
156 bool transparent_hugepage_enabled(struct vm_area_struct *vma);
158 #define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
160 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
163 /* Don't have to check pgoff for anonymous vma */
164 if (!vma_is_anonymous(vma)) {
165 if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
166 (vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
170 if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
175 #define transparent_hugepage_use_zero_page() \
176 (transparent_hugepage_flags & \
177 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
179 unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
180 unsigned long len, unsigned long pgoff, unsigned long flags);
182 void prep_transhuge_page(struct page *page);
183 void free_transhuge_page(struct page *page);
184 bool is_transparent_hugepage(struct page *page);
186 bool can_split_huge_page(struct page *page, int *pextra_pins);
187 int split_huge_page_to_list(struct page *page, struct list_head *list);
188 static inline int split_huge_page(struct page *page)
190 return split_huge_page_to_list(page, NULL);
192 void deferred_split_huge_page(struct page *page);
194 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
195 unsigned long address, bool freeze, struct page *page);
197 #define split_huge_pmd(__vma, __pmd, __address) \
199 pmd_t *____pmd = (__pmd); \
200 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
201 || pmd_devmap(*____pmd)) \
202 __split_huge_pmd(__vma, __pmd, __address, \
207 void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
208 bool freeze, struct page *page);
210 void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
211 unsigned long address);
213 #define split_huge_pud(__vma, __pud, __address) \
215 pud_t *____pud = (__pud); \
216 if (pud_trans_huge(*____pud) \
217 || pud_devmap(*____pud)) \
218 __split_huge_pud(__vma, __pud, __address); \
221 int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags,
223 void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
224 unsigned long end, long adjust_next);
225 spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma);
226 spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma);
228 static inline int is_swap_pmd(pmd_t pmd)
230 return !pmd_none(pmd) && !pmd_present(pmd);
233 /* mmap_lock must be held on entry */
234 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
235 struct vm_area_struct *vma)
237 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
238 return __pmd_trans_huge_lock(pmd, vma);
242 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
243 struct vm_area_struct *vma)
245 if (pud_trans_huge(*pud) || pud_devmap(*pud))
246 return __pud_trans_huge_lock(pud, vma);
252 * thp_head - Head page of a transparent huge page.
253 * @page: Any page (tail, head or regular) found in the page cache.
255 static inline struct page *thp_head(struct page *page)
257 return compound_head(page);
261 * thp_order - Order of a transparent huge page.
262 * @page: Head page of a transparent huge page.
264 static inline unsigned int thp_order(struct page *page)
266 VM_BUG_ON_PGFLAGS(PageTail(page), page);
268 return HPAGE_PMD_ORDER;
273 * thp_nr_pages - The number of regular pages in this huge page.
274 * @page: The head page of a huge page.
276 static inline int thp_nr_pages(struct page *page)
278 VM_BUG_ON_PGFLAGS(PageTail(page), page);
284 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
285 pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
286 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
287 pud_t *pud, int flags, struct dev_pagemap **pgmap);
289 vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
291 extern struct page *huge_zero_page;
293 static inline bool is_huge_zero_page(struct page *page)
295 return READ_ONCE(huge_zero_page) == page;
298 static inline bool is_huge_zero_pmd(pmd_t pmd)
300 return is_huge_zero_page(pmd_page(pmd));
303 static inline bool is_huge_zero_pud(pud_t pud)
308 struct page *mm_get_huge_zero_page(struct mm_struct *mm);
309 void mm_put_huge_zero_page(struct mm_struct *mm);
311 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
313 static inline bool thp_migration_supported(void)
315 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
318 static inline struct list_head *page_deferred_list(struct page *page)
321 * Global or memcg deferred list in the second tail pages is
322 * occupied by compound_head.
324 return &page[2].deferred_list;
327 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
328 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
329 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
330 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
332 #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
333 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
334 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
336 static inline struct page *thp_head(struct page *page)
338 VM_BUG_ON_PGFLAGS(PageTail(page), page);
342 static inline unsigned int thp_order(struct page *page)
344 VM_BUG_ON_PGFLAGS(PageTail(page), page);
348 static inline int thp_nr_pages(struct page *page)
350 VM_BUG_ON_PGFLAGS(PageTail(page), page);
354 static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
359 static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
364 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
370 static inline void prep_transhuge_page(struct page *page) {}
372 static inline bool is_transparent_hugepage(struct page *page)
377 #define transparent_hugepage_flags 0UL
379 #define thp_get_unmapped_area NULL
382 can_split_huge_page(struct page *page, int *pextra_pins)
388 split_huge_page_to_list(struct page *page, struct list_head *list)
392 static inline int split_huge_page(struct page *page)
396 static inline void deferred_split_huge_page(struct page *page) {}
397 #define split_huge_pmd(__vma, __pmd, __address) \
400 static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
401 unsigned long address, bool freeze, struct page *page) {}
402 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
403 unsigned long address, bool freeze, struct page *page) {}
405 #define split_huge_pud(__vma, __pmd, __address) \
408 static inline int hugepage_madvise(struct vm_area_struct *vma,
409 unsigned long *vm_flags, int advice)
414 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
420 static inline int is_swap_pmd(pmd_t pmd)
424 static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
425 struct vm_area_struct *vma)
429 static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
430 struct vm_area_struct *vma)
435 static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
441 static inline bool is_huge_zero_page(struct page *page)
446 static inline bool is_huge_zero_pud(pud_t pud)
451 static inline void mm_put_huge_zero_page(struct mm_struct *mm)
456 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
457 unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
462 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
463 unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
468 static inline bool thp_migration_supported(void)
472 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
475 * thp_size - Size of a transparent huge page.
476 * @page: Head page of a transparent huge page.
478 * Return: Number of bytes in this page.
480 static inline unsigned long thp_size(struct page *page)
482 return PAGE_SIZE << thp_order(page);
485 #endif /* _LINUX_HUGE_MM_H */