1
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>
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
96
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 HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
125
126static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
127 unsigned long haddr)
128{
129
130 if (!vma_is_anonymous(vma)) {
131 if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
132 (vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
133 return false;
134 }
135
136 if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
137 return false;
138 return true;
139}
140
141#define transparent_hugepage_use_zero_page() \
142 (transparent_hugepage_flags & \
143 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
144#ifdef CONFIG_DEBUG_VM
145#define transparent_hugepage_debug_cow() \
146 (transparent_hugepage_flags & \
147 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
148#else
149#define transparent_hugepage_debug_cow() 0
150#endif
151
152extern unsigned long thp_get_unmapped_area(struct file *filp,
153 unsigned long addr, unsigned long len, unsigned long pgoff,
154 unsigned long flags);
155
156extern void prep_transhuge_page(struct page *page);
157extern void free_transhuge_page(struct page *page);
158
159bool can_split_huge_page(struct page *page, int *pextra_pins);
160int split_huge_page_to_list(struct page *page, struct list_head *list);
161static inline int split_huge_page(struct page *page)
162{
163 return split_huge_page_to_list(page, NULL);
164}
165void deferred_split_huge_page(struct page *page);
166
167void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
168 unsigned long address, bool freeze, struct page *page);
169
170#define split_huge_pmd(__vma, __pmd, __address) \
171 do { \
172 pmd_t *____pmd = (__pmd); \
173 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
174 || pmd_devmap(*____pmd)) \
175 __split_huge_pmd(__vma, __pmd, __address, \
176 false, NULL); \
177 } while (0)
178
179
180void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
181 bool freeze, struct page *page);
182
183void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
184 unsigned long address);
185
186#define split_huge_pud(__vma, __pud, __address) \
187 do { \
188 pud_t *____pud = (__pud); \
189 if (pud_trans_huge(*____pud) \
190 || pud_devmap(*____pud)) \
191 __split_huge_pud(__vma, __pud, __address); \
192 } while (0)
193
194extern int hugepage_madvise(struct vm_area_struct *vma,
195 unsigned long *vm_flags, int advice);
196extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
197 unsigned long start,
198 unsigned long end,
199 long adjust_next);
200extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
201 struct vm_area_struct *vma);
202extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
203 struct vm_area_struct *vma);
204
205static inline int is_swap_pmd(pmd_t pmd)
206{
207 return !pmd_none(pmd) && !pmd_present(pmd);
208}
209
210
211static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
212 struct vm_area_struct *vma)
213{
214 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
215 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
216 return __pmd_trans_huge_lock(pmd, vma);
217 else
218 return NULL;
219}
220static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
221 struct vm_area_struct *vma)
222{
223 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
224 if (pud_trans_huge(*pud) || pud_devmap(*pud))
225 return __pud_trans_huge_lock(pud, vma);
226 else
227 return NULL;
228}
229static inline int hpage_nr_pages(struct page *page)
230{
231 if (unlikely(PageTransHuge(page)))
232 return HPAGE_PMD_NR;
233 return 1;
234}
235
236struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
237 pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
238struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
239 pud_t *pud, int flags, struct dev_pagemap **pgmap);
240
241extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
242
243extern struct page *huge_zero_page;
244
245static inline bool is_huge_zero_page(struct page *page)
246{
247 return READ_ONCE(huge_zero_page) == page;
248}
249
250static inline bool is_huge_zero_pmd(pmd_t pmd)
251{
252 return is_huge_zero_page(pmd_page(pmd));
253}
254
255static inline bool is_huge_zero_pud(pud_t pud)
256{
257 return false;
258}
259
260struct page *mm_get_huge_zero_page(struct mm_struct *mm);
261void mm_put_huge_zero_page(struct mm_struct *mm);
262
263#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
264
265static inline bool thp_migration_supported(void)
266{
267 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
268}
269
270#else
271#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
272#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
273#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
274
275#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
276#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
277#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
278
279#define hpage_nr_pages(x) 1
280
281static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
282{
283 return false;
284}
285
286static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
287{
288 return false;
289}
290
291static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
292 unsigned long haddr)
293{
294 return false;
295}
296
297static inline void prep_transhuge_page(struct page *page) {}
298
299#define transparent_hugepage_flags 0UL
300
301#define thp_get_unmapped_area NULL
302
303static inline bool
304can_split_huge_page(struct page *page, int *pextra_pins)
305{
306 BUILD_BUG();
307 return false;
308}
309static inline int
310split_huge_page_to_list(struct page *page, struct list_head *list)
311{
312 return 0;
313}
314static inline int split_huge_page(struct page *page)
315{
316 return 0;
317}
318static inline void deferred_split_huge_page(struct page *page) {}
319#define split_huge_pmd(__vma, __pmd, __address) \
320 do { } while (0)
321
322static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
323 unsigned long address, bool freeze, struct page *page) {}
324static inline void split_huge_pmd_address(struct vm_area_struct *vma,
325 unsigned long address, bool freeze, struct page *page) {}
326
327#define split_huge_pud(__vma, __pmd, __address) \
328 do { } while (0)
329
330static inline int hugepage_madvise(struct vm_area_struct *vma,
331 unsigned long *vm_flags, int advice)
332{
333 BUG();
334 return 0;
335}
336static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
337 unsigned long start,
338 unsigned long end,
339 long adjust_next)
340{
341}
342static inline int is_swap_pmd(pmd_t pmd)
343{
344 return 0;
345}
346static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
347 struct vm_area_struct *vma)
348{
349 return NULL;
350}
351static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
352 struct vm_area_struct *vma)
353{
354 return NULL;
355}
356
357static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
358 pmd_t orig_pmd)
359{
360 return 0;
361}
362
363static inline bool is_huge_zero_page(struct page *page)
364{
365 return false;
366}
367
368static inline bool is_huge_zero_pud(pud_t pud)
369{
370 return false;
371}
372
373static inline void mm_put_huge_zero_page(struct mm_struct *mm)
374{
375 return;
376}
377
378static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
379 unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
380{
381 return NULL;
382}
383
384static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
385 unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
386{
387 return NULL;
388}
389
390static inline bool thp_migration_supported(void)
391{
392 return false;
393}
394#endif
395
396#endif
397
