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
,
93 struct kobj_attribute
;
95 ssize_t
single_hugepage_flag_store(struct kobject
*kobj
,
96 struct kobj_attribute
*attr
,
97 const char *buf
, size_t count
,
98 enum transparent_hugepage_flag flag
);
99 ssize_t
single_hugepage_flag_show(struct kobject
*kobj
,
100 struct kobj_attribute
*attr
, char *buf
,
101 enum transparent_hugepage_flag flag
);
102 extern struct kobj_attribute shmem_enabled_attr
;
104 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
105 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
107 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
108 #define HPAGE_PMD_SHIFT PMD_SHIFT
109 #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
110 #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
112 #define HPAGE_PUD_SHIFT PUD_SHIFT
113 #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
114 #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
116 extern unsigned long transparent_hugepage_flags
;
119 * to be used on vmas which are known to support THP.
120 * Use transparent_hugepage_enabled otherwise
122 static inline bool __transparent_hugepage_enabled(struct vm_area_struct
*vma
)
126 * If the hardware/firmware marked hugepage support disabled.
128 if (transparent_hugepage_flags
& (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX
))
131 if (vma
->vm_flags
& VM_NOHUGEPAGE
)
134 if (vma_is_temporary_stack(vma
))
137 if (test_bit(MMF_DISABLE_THP
, &vma
->vm_mm
->flags
))
140 if (transparent_hugepage_flags
& (1 << TRANSPARENT_HUGEPAGE_FLAG
))
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 */