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_area_struct *vma, unsigned long addr,
51 pmd_t *pmd, pfn_t pfn, bool write);
52vm_fault_t vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
53 pud_t *pud, pfn_t pfn, bool write);
54enum transparent_hugepage_flag {
55 TRANSPARENT_HUGEPAGE_FLAG,
56 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
57 TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
58 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
59 TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
60 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
61 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
62 TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
63#ifdef CONFIG_DEBUG_VM
64 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
65#endif
66};
67
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);
78extern struct kobj_attribute shmem_enabled_attr;
79
80#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
81#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
82
83#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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))
87
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
92extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
93
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
110 if (vma_is_dax(vma))
111 return true;
112
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
120#define transparent_hugepage_use_zero_page() \
121 (transparent_hugepage_flags & \
122 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
123#ifdef CONFIG_DEBUG_VM
124#define transparent_hugepage_debug_cow() \
125 (transparent_hugepage_flags & \
126 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
127#else
128#define transparent_hugepage_debug_cow() 0
129#endif
130
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
135extern void prep_transhuge_page(struct page *page);
136extern void free_transhuge_page(struct page *page);
137
138bool can_split_huge_page(struct page *page, int *pextra_pins);
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}
144void deferred_split_huge_page(struct page *page);
145
146void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
147 unsigned long address, bool freeze, struct page *page);
148
149#define split_huge_pmd(__vma, __pmd, __address) \
150 do { \
151 pmd_t *____pmd = (__pmd); \
152 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
153 || pmd_devmap(*____pmd)) \
154 __split_huge_pmd(__vma, __pmd, __address, \
155 false, NULL); \
156 } while (0)
157
158
159void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
160 bool freeze, struct page *page);
161
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
173extern int hugepage_madvise(struct vm_area_struct *vma,
174 unsigned long *vm_flags, int advice);
175extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
176 unsigned long start,
177 unsigned long end,
178 long adjust_next);
179extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
180 struct vm_area_struct *vma);
181extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
182 struct vm_area_struct *vma);
183
184static inline int is_swap_pmd(pmd_t pmd)
185{
186 return !pmd_none(pmd) && !pmd_present(pmd);
187}
188
189
190static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
191 struct vm_area_struct *vma)
192{
193 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
194 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
195 return __pmd_trans_huge_lock(pmd, vma);
196 else
197 return NULL;
198}
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}
208static inline int hpage_nr_pages(struct page *page)
209{
210 if (unlikely(PageTransHuge(page)))
211 return HPAGE_PMD_NR;
212 return 1;
213}
214
215struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
216 pmd_t *pmd, int flags);
217struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
218 pud_t *pud, int flags);
219
220extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
221
222extern struct page *huge_zero_page;
223
224static inline bool is_huge_zero_page(struct page *page)
225{
226 return READ_ONCE(huge_zero_page) == page;
227}
228
229static inline bool is_huge_zero_pmd(pmd_t pmd)
230{
231 return is_huge_zero_page(pmd_page(pmd));
232}
233
234static inline bool is_huge_zero_pud(pud_t pud)
235{
236 return false;
237}
238
239struct page *mm_get_huge_zero_page(struct mm_struct *mm);
240void mm_put_huge_zero_page(struct mm_struct *mm);
241
242#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
243
244static inline bool thp_migration_supported(void)
245{
246 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
247}
248
249#else
250#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
251#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
252#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
253
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
258#define hpage_nr_pages(x) 1
259
260static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
261{
262 return false;
263}
264
265static inline void prep_transhuge_page(struct page *page) {}
266
267#define transparent_hugepage_flags 0UL
268
269#define thp_get_unmapped_area NULL
270
271static inline bool
272can_split_huge_page(struct page *page, int *pextra_pins)
273{
274 BUILD_BUG();
275 return false;
276}
277static inline int
278split_huge_page_to_list(struct page *page, struct list_head *list)
279{
280 return 0;
281}
282static inline int split_huge_page(struct page *page)
283{
284 return 0;
285}
286static inline void deferred_split_huge_page(struct page *page) {}
287#define split_huge_pmd(__vma, __pmd, __address) \
288 do { } while (0)
289
290static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
291 unsigned long address, bool freeze, struct page *page) {}
292static inline void split_huge_pmd_address(struct vm_area_struct *vma,
293 unsigned long address, bool freeze, struct page *page) {}
294
295#define split_huge_pud(__vma, __pmd, __address) \
296 do { } while (0)
297
298static inline int hugepage_madvise(struct vm_area_struct *vma,
299 unsigned long *vm_flags, int advice)
300{
301 BUG();
302 return 0;
303}
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}
310static inline int is_swap_pmd(pmd_t pmd)
311{
312 return 0;
313}
314static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
315 struct vm_area_struct *vma)
316{
317 return NULL;
318}
319static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
320 struct vm_area_struct *vma)
321{
322 return NULL;
323}
324
325static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
326 pmd_t orig_pmd)
327{
328 return 0;
329}
330
331static inline bool is_huge_zero_page(struct page *page)
332{
333 return false;
334}
335
336static inline bool is_huge_zero_pud(pud_t pud)
337{
338 return false;
339}
340
341static inline void mm_put_huge_zero_page(struct mm_struct *mm)
342{
343 return;
344}
345
346static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
347 unsigned long addr, pmd_t *pmd, int flags)
348{
349 return NULL;
350}
351
352static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
353 unsigned long addr, pud_t *pud, int flags)
354{
355 return NULL;
356}
357
358static inline bool thp_migration_supported(void)
359{
360 return false;
361}
362#endif
363
364#endif
365
