Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_HUGE_MM_H
3#define _LINUX_HUGE_MM_H
4
5#include <linux/sched/coredump.h>
6#include <linux/mm_types.h>
7
8#include <linux/fs.h> /* only for vma_is_dax() */
9
10extern vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
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);
14extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
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
27extern vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
28extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
29 unsigned long addr,
30 pmd_t *pmd,
31 unsigned int flags);
32extern 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);
35extern int zap_huge_pmd(struct mmu_gather *tlb,
36 struct vm_area_struct *vma,
37 pmd_t *pmd, unsigned long addr);
38extern int zap_huge_pud(struct mmu_gather *tlb,
39 struct vm_area_struct *vma,
40 pud_t *pud, unsigned long addr);
41extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
42 unsigned long addr, unsigned long end,
43 unsigned char *vec);
44extern 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);
47extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
48 unsigned long addr, pgprot_t newprot,
49 int prot_numa);
50vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write);
51vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write);
52enum transparent_hugepage_flag {
53 TRANSPARENT_HUGEPAGE_FLAG,
54 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
55 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
56 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
57 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
58 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
59 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
60 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
61#ifdef CONFIG_DEBUG_VM
62 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
63#endif
64};
65
66struct kobject;
67struct kobj_attribute;
68
69extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
70 struct kobj_attribute *attr,
71 const char *buf, size_t count,
72 enum transparent_hugepage_flag flag);
73extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
74 struct kobj_attribute *attr, char *buf,
75 enum transparent_hugepage_flag flag);
76extern struct kobj_attribute shmem_enabled_attr;
77
78#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
79#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
80
81#ifdef CONFIG_TRANSPARENT_HUGEPAGE
82#define HPAGE_PMD_SHIFT PMD_SHIFT
83#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
84#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
85
86#define HPAGE_PUD_SHIFT PUD_SHIFT
87#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
88#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
89
90extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
91
92extern unsigned long transparent_hugepage_flags;
93
94/*
95 * to be used on vmas which are known to support THP.
96 * Use transparent_hugepage_enabled otherwise
97 */
98static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
99{
100 if (vma->vm_flags & VM_NOHUGEPAGE)
101 return false;
102
103 if (is_vma_temporary_stack(vma))
104 return false;
105
106 if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
107 return false;
108
109 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
110 return true;
111
112 if (vma_is_dax(vma))
113 return true;
114
115 if (transparent_hugepage_flags &
116 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
117 return !!(vma->vm_flags & VM_HUGEPAGE);
118
119 return false;
120}
121
122bool transparent_hugepage_enabled(struct vm_area_struct *vma);
123
124#define transparent_hugepage_use_zero_page() \
125 (transparent_hugepage_flags & \
126 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
127#ifdef CONFIG_DEBUG_VM
128#define transparent_hugepage_debug_cow() \
129 (transparent_hugepage_flags & \
130 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
131#else /* CONFIG_DEBUG_VM */
132#define transparent_hugepage_debug_cow() 0
133#endif /* CONFIG_DEBUG_VM */
134
135extern unsigned long thp_get_unmapped_area(struct file *filp,
136 unsigned long addr, unsigned long len, unsigned long pgoff,
137 unsigned long flags);
138
139extern void prep_transhuge_page(struct page *page);
140extern void free_transhuge_page(struct page *page);
141
142bool can_split_huge_page(struct page *page, int *pextra_pins);
143int split_huge_page_to_list(struct page *page, struct list_head *list);
144static inline int split_huge_page(struct page *page)
145{
146 return split_huge_page_to_list(page, NULL);
147}
148void deferred_split_huge_page(struct page *page);
149
150void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
151 unsigned long address, bool freeze, struct page *page);
152
153#define split_huge_pmd(__vma, __pmd, __address) \
154 do { \
155 pmd_t *____pmd = (__pmd); \
156 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
157 || pmd_devmap(*____pmd)) \
158 __split_huge_pmd(__vma, __pmd, __address, \
159 false, NULL); \
160 } while (0)
161
162
163void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
164 bool freeze, struct page *page);
165
166void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
167 unsigned long address);
168
169#define split_huge_pud(__vma, __pud, __address) \
170 do { \
171 pud_t *____pud = (__pud); \
172 if (pud_trans_huge(*____pud) \
173 || pud_devmap(*____pud)) \
174 __split_huge_pud(__vma, __pud, __address); \
175 } while (0)
176
177extern int hugepage_madvise(struct vm_area_struct *vma,
178 unsigned long *vm_flags, int advice);
179extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
180 unsigned long start,
181 unsigned long end,
182 long adjust_next);
183extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
184 struct vm_area_struct *vma);
185extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
186 struct vm_area_struct *vma);
187
188static inline int is_swap_pmd(pmd_t pmd)
189{
190 return !pmd_none(pmd) && !pmd_present(pmd);
191}
192
193/* mmap_sem must be held on entry */
194static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
195 struct vm_area_struct *vma)
196{
197 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
198 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
199 return __pmd_trans_huge_lock(pmd, vma);
200 else
201 return NULL;
202}
203static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
204 struct vm_area_struct *vma)
205{
206 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
207 if (pud_trans_huge(*pud) || pud_devmap(*pud))
208 return __pud_trans_huge_lock(pud, vma);
209 else
210 return NULL;
211}
212static inline int hpage_nr_pages(struct page *page)
213{
214 if (unlikely(PageTransHuge(page)))
215 return HPAGE_PMD_NR;
216 return 1;
217}
218
219struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
220 pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
221struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
222 pud_t *pud, int flags, struct dev_pagemap **pgmap);
223
224extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
225
226extern struct page *huge_zero_page;
227
228static inline bool is_huge_zero_page(struct page *page)
229{
230 return READ_ONCE(huge_zero_page) == page;
231}
232
233static inline bool is_huge_zero_pmd(pmd_t pmd)
234{
235 return is_huge_zero_page(pmd_page(pmd));
236}
237
238static inline bool is_huge_zero_pud(pud_t pud)
239{
240 return false;
241}
242
243struct page *mm_get_huge_zero_page(struct mm_struct *mm);
244void mm_put_huge_zero_page(struct mm_struct *mm);
245
246#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
247
248static inline bool thp_migration_supported(void)
249{
250 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
251}
252
253#else /* CONFIG_TRANSPARENT_HUGEPAGE */
254#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
255#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
256#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
257
258#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
259#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
260#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
261
262#define hpage_nr_pages(x) 1
263
264static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
265{
266 return false;
267}
268
269static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
270{
271 return false;
272}
273
274static inline void prep_transhuge_page(struct page *page) {}
275
276#define transparent_hugepage_flags 0UL
277
278#define thp_get_unmapped_area NULL
279
280static inline bool
281can_split_huge_page(struct page *page, int *pextra_pins)
282{
283 BUILD_BUG();
284 return false;
285}
286static inline int
287split_huge_page_to_list(struct page *page, struct list_head *list)
288{
289 return 0;
290}
291static inline int split_huge_page(struct page *page)
292{
293 return 0;
294}
295static inline void deferred_split_huge_page(struct page *page) {}
296#define split_huge_pmd(__vma, __pmd, __address) \
297 do { } while (0)
298
299static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
300 unsigned long address, bool freeze, struct page *page) {}
301static inline void split_huge_pmd_address(struct vm_area_struct *vma,
302 unsigned long address, bool freeze, struct page *page) {}
303
304#define split_huge_pud(__vma, __pmd, __address) \
305 do { } while (0)
306
307static inline int hugepage_madvise(struct vm_area_struct *vma,
308 unsigned long *vm_flags, int advice)
309{
310 BUG();
311 return 0;
312}
313static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
314 unsigned long start,
315 unsigned long end,
316 long adjust_next)
317{
318}
319static inline int is_swap_pmd(pmd_t pmd)
320{
321 return 0;
322}
323static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
324 struct vm_area_struct *vma)
325{
326 return NULL;
327}
328static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
329 struct vm_area_struct *vma)
330{
331 return NULL;
332}
333
334static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
335 pmd_t orig_pmd)
336{
337 return 0;
338}
339
340static inline bool is_huge_zero_page(struct page *page)
341{
342 return false;
343}
344
345static inline bool is_huge_zero_pud(pud_t pud)
346{
347 return false;
348}
349
350static inline void mm_put_huge_zero_page(struct mm_struct *mm)
351{
352 return;
353}
354
355static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
356 unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
357{
358 return NULL;
359}
360
361static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
362 unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
363{
364 return NULL;
365}
366
367static inline bool thp_migration_supported(void)
368{
369 return false;
370}
371#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
372
373#endif /* _LINUX_HUGE_MM_H */