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[mirror_ubuntu-jammy-kernel.git] / include / linux / huge_mm.h
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b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
71e3aac0
AA
2#ifndef _LINUX_HUGE_MM_H
3#define _LINUX_HUGE_MM_H
4
16981d76 5#include <linux/sched/coredump.h>
226ab561 6#include <linux/mm_types.h>
16981d76 7
baabda26
DW
8#include <linux/fs.h> /* only for vma_is_dax() */
9
2b740303 10extern vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
71e3aac0
AA
11extern 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);
82b0f8c3 14extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
a00cc7d9
MW
15extern 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);
18
19#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
20extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
21#else
22static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
23{
24}
25#endif
26
2b740303 27extern vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
b676b293 28extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
71e3aac0
AA
29 unsigned long addr,
30 pmd_t *pmd,
31 unsigned int flags);
319904ad 32extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
b8d3c4c3
MK
33 struct vm_area_struct *vma,
34 pmd_t *pmd, unsigned long addr, unsigned long next);
71e3aac0
AA
35extern int zap_huge_pmd(struct mmu_gather *tlb,
36 struct vm_area_struct *vma,
f21760b1 37 pmd_t *pmd, unsigned long addr);
a00cc7d9
MW
38extern int zap_huge_pud(struct mmu_gather *tlb,
39 struct vm_area_struct *vma,
40 pud_t *pud, unsigned long addr);
0ca1634d
JW
41extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
42 unsigned long addr, unsigned long end,
43 unsigned char *vec);
bf8616d5 44extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
37a1c49a 45 unsigned long new_addr, unsigned long old_end,
eb66ae03 46 pmd_t *old_pmd, pmd_t *new_pmd);
cd7548ab 47extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
4b10e7d5
MG
48 unsigned long addr, pgprot_t newprot,
49 int prot_numa);
226ab561 50vm_fault_t vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
a00cc7d9 51 pmd_t *pmd, pfn_t pfn, bool write);
226ab561 52vm_fault_t vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
a00cc7d9 53 pud_t *pud, pfn_t pfn, bool write);
71e3aac0
AA
54enum transparent_hugepage_flag {
55 TRANSPARENT_HUGEPAGE_FLAG,
56 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
444eb2a4
MG
57 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
58 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
21440d7e 59 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
71e3aac0 60 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
ba76149f 61 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
79da5407 62 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
71e3aac0
AA
63#ifdef CONFIG_DEBUG_VM
64 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
65#endif
66};
67
b46e756f
KS
68struct kobject;
69struct kobj_attribute;
70
71extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
72 struct kobj_attribute *attr,
73 const char *buf, size_t count,
74 enum transparent_hugepage_flag flag);
75extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
76 struct kobj_attribute *attr, char *buf,
77 enum transparent_hugepage_flag flag);
5a6e75f8
KS
78extern struct kobj_attribute shmem_enabled_attr;
79
d8c37c48
NH
80#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
81#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
82
71e3aac0 83#ifdef CONFIG_TRANSPARENT_HUGEPAGE
fde52796
AK
84#define HPAGE_PMD_SHIFT PMD_SHIFT
85#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
86#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
71e3aac0 87
a00cc7d9
MW
88#define HPAGE_PUD_SHIFT PUD_SHIFT
89#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
90#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
91
20995974
AS
92extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
93
16981d76
DW
94extern unsigned long transparent_hugepage_flags;
95
96static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
97{
98 if (vma->vm_flags & VM_NOHUGEPAGE)
99 return false;
100
101 if (is_vma_temporary_stack(vma))
102 return false;
103
104 if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
105 return false;
106
107 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
108 return true;
109
baabda26
DW
110 if (vma_is_dax(vma))
111 return true;
112
16981d76
DW
113 if (transparent_hugepage_flags &
114 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
115 return !!(vma->vm_flags & VM_HUGEPAGE);
116
117 return false;
118}
119
79da5407
KS
120#define transparent_hugepage_use_zero_page() \
121 (transparent_hugepage_flags & \
122 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
71e3aac0
AA
123#ifdef CONFIG_DEBUG_VM
124#define transparent_hugepage_debug_cow() \
125 (transparent_hugepage_flags & \
126 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
127#else /* CONFIG_DEBUG_VM */
128#define transparent_hugepage_debug_cow() 0
129#endif /* CONFIG_DEBUG_VM */
130
74d2fad1
TK
131extern unsigned long thp_get_unmapped_area(struct file *filp,
132 unsigned long addr, unsigned long len, unsigned long pgoff,
133 unsigned long flags);
134
9a982250
KS
135extern void prep_transhuge_page(struct page *page);
136extern void free_transhuge_page(struct page *page);
137
b8f593cd 138bool can_split_huge_page(struct page *page, int *pextra_pins);
e9b61f19
KS
139int split_huge_page_to_list(struct page *page, struct list_head *list);
140static inline int split_huge_page(struct page *page)
141{
142 return split_huge_page_to_list(page, NULL);
143}
9a982250 144void deferred_split_huge_page(struct page *page);
eef1b3ba
KS
145
146void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
33f4751e 147 unsigned long address, bool freeze, struct page *page);
eef1b3ba
KS
148
149#define split_huge_pmd(__vma, __pmd, __address) \
150 do { \
151 pmd_t *____pmd = (__pmd); \
84c3fc4e 152 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
5c7fb56e 153 || pmd_devmap(*____pmd)) \
fec89c10 154 __split_huge_pmd(__vma, __pmd, __address, \
33f4751e 155 false, NULL); \
eef1b3ba 156 } while (0)
ad0bed24 157
2a52bcbc 158
fec89c10
KS
159void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
160 bool freeze, struct page *page);
2a52bcbc 161
a00cc7d9
MW
162void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
163 unsigned long address);
164
165#define split_huge_pud(__vma, __pud, __address) \
166 do { \
167 pud_t *____pud = (__pud); \
168 if (pud_trans_huge(*____pud) \
169 || pud_devmap(*____pud)) \
170 __split_huge_pud(__vma, __pud, __address); \
171 } while (0)
172
60ab3244
AA
173extern int hugepage_madvise(struct vm_area_struct *vma,
174 unsigned long *vm_flags, int advice);
e1b9996b 175extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
94fcc585
AA
176 unsigned long start,
177 unsigned long end,
178 long adjust_next);
b6ec57f4
KS
179extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
180 struct vm_area_struct *vma);
a00cc7d9
MW
181extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
182 struct vm_area_struct *vma);
84c3fc4e
ZY
183
184static inline int is_swap_pmd(pmd_t pmd)
185{
186 return !pmd_none(pmd) && !pmd_present(pmd);
187}
188
025c5b24 189/* mmap_sem must be held on entry */
b6ec57f4
KS
190static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
191 struct vm_area_struct *vma)
025c5b24 192{
81d1b09c 193 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
84c3fc4e 194 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
b6ec57f4 195 return __pmd_trans_huge_lock(pmd, vma);
025c5b24 196 else
969e8d7e 197 return NULL;
025c5b24 198}
a00cc7d9
MW
199static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
200 struct vm_area_struct *vma)
201{
202 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
203 if (pud_trans_huge(*pud) || pud_devmap(*pud))
204 return __pud_trans_huge_lock(pud, vma);
205 else
206 return NULL;
207}
2c888cfb
RR
208static inline int hpage_nr_pages(struct page *page)
209{
210 if (unlikely(PageTransHuge(page)))
211 return HPAGE_PMD_NR;
212 return 1;
213}
d10e63f2 214
a00cc7d9 215struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
df06b37f 216 pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
a00cc7d9 217struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
df06b37f 218 pud_t *pud, int flags, struct dev_pagemap **pgmap);
a00cc7d9 219
2b740303 220extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
d10e63f2 221
56873f43
WY
222extern struct page *huge_zero_page;
223
224static inline bool is_huge_zero_page(struct page *page)
225{
6aa7de05 226 return READ_ONCE(huge_zero_page) == page;
56873f43
WY
227}
228
fc437044
MW
229static inline bool is_huge_zero_pmd(pmd_t pmd)
230{
231 return is_huge_zero_page(pmd_page(pmd));
232}
233
a00cc7d9
MW
234static inline bool is_huge_zero_pud(pud_t pud)
235{
236 return false;
237}
238
6fcb52a5
AL
239struct page *mm_get_huge_zero_page(struct mm_struct *mm);
240void mm_put_huge_zero_page(struct mm_struct *mm);
fc437044 241
10102459
KS
242#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
243
9c670ea3
NH
244static inline bool thp_migration_supported(void)
245{
246 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
247}
248
71e3aac0 249#else /* CONFIG_TRANSPARENT_HUGEPAGE */
d8c37c48
NH
250#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
251#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
252#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
71e3aac0 253
a00cc7d9
MW
254#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
255#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
256#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
257
2c888cfb
RR
258#define hpage_nr_pages(x) 1
259
16981d76
DW
260static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
261{
262 return false;
263}
71e3aac0 264
800d8c63
KS
265static inline void prep_transhuge_page(struct page *page) {}
266
71e3aac0 267#define transparent_hugepage_flags 0UL
74d2fad1
TK
268
269#define thp_get_unmapped_area NULL
270
b8f593cd
HY
271static inline bool
272can_split_huge_page(struct page *page, int *pextra_pins)
273{
274 BUILD_BUG();
275 return false;
276}
5bc7b8ac
SL
277static inline int
278split_huge_page_to_list(struct page *page, struct list_head *list)
279{
280 return 0;
281}
71e3aac0
AA
282static inline int split_huge_page(struct page *page)
283{
284 return 0;
285}
9a982250 286static inline void deferred_split_huge_page(struct page *page) {}
78ddc534 287#define split_huge_pmd(__vma, __pmd, __address) \
e180377f 288 do { } while (0)
2a52bcbc 289
fd60775a
DR
290static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
291 unsigned long address, bool freeze, struct page *page) {}
2a52bcbc 292static inline void split_huge_pmd_address(struct vm_area_struct *vma,
fec89c10 293 unsigned long address, bool freeze, struct page *page) {}
2a52bcbc 294
a00cc7d9
MW
295#define split_huge_pud(__vma, __pmd, __address) \
296 do { } while (0)
297
60ab3244
AA
298static inline int hugepage_madvise(struct vm_area_struct *vma,
299 unsigned long *vm_flags, int advice)
0af4e98b
AA
300{
301 BUG();
302 return 0;
303}
94fcc585
AA
304static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
305 unsigned long start,
306 unsigned long end,
307 long adjust_next)
308{
309}
84c3fc4e
ZY
310static inline int is_swap_pmd(pmd_t pmd)
311{
312 return 0;
313}
b6ec57f4
KS
314static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
315 struct vm_area_struct *vma)
025c5b24 316{
b6ec57f4 317 return NULL;
025c5b24 318}
a00cc7d9
MW
319static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
320 struct vm_area_struct *vma)
321{
322 return NULL;
323}
d10e63f2 324
2b740303
SJ
325static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
326 pmd_t orig_pmd)
d10e63f2 327{
4daae3b4 328 return 0;
d10e63f2
MG
329}
330
56873f43
WY
331static inline bool is_huge_zero_page(struct page *page)
332{
333 return false;
334}
335
a00cc7d9
MW
336static inline bool is_huge_zero_pud(pud_t pud)
337{
338 return false;
339}
340
6fcb52a5 341static inline void mm_put_huge_zero_page(struct mm_struct *mm)
aa88b68c 342{
6fcb52a5 343 return;
aa88b68c 344}
3565fce3
DW
345
346static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
df06b37f 347 unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
3565fce3
DW
348{
349 return NULL;
350}
a00cc7d9
MW
351
352static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
df06b37f 353 unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
a00cc7d9
MW
354{
355 return NULL;
356}
9c670ea3
NH
357
358static inline bool thp_migration_supported(void)
359{
360 return false;
361}
71e3aac0
AA
362#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
363
364#endif /* _LINUX_HUGE_MM_H */