Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1#ifndef _LINUX_HUGE_MM_H
2#define _LINUX_HUGE_MM_H
3
4#include <linux/sched/coredump.h>
5
6#include <linux/fs.h> /* only for vma_is_dax() */
7
8extern int do_huge_pmd_anonymous_page(struct vm_fault *vmf);
9extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
10 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
11 struct vm_area_struct *vma);
12extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
13extern int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
14 pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
15 struct vm_area_struct *vma);
16
17#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
18extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
19#else
20static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
21{
22}
23#endif
24
25extern int do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
26extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
27 unsigned long addr,
28 pmd_t *pmd,
29 unsigned int flags);
30extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
31 struct vm_area_struct *vma,
32 pmd_t *pmd, unsigned long addr, unsigned long next);
33extern int zap_huge_pmd(struct mmu_gather *tlb,
34 struct vm_area_struct *vma,
35 pmd_t *pmd, unsigned long addr);
36extern int zap_huge_pud(struct mmu_gather *tlb,
37 struct vm_area_struct *vma,
38 pud_t *pud, unsigned long addr);
39extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
40 unsigned long addr, unsigned long end,
41 unsigned char *vec);
42extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
43 unsigned long new_addr, unsigned long old_end,
44 pmd_t *old_pmd, pmd_t *new_pmd, bool *need_flush);
45extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
46 unsigned long addr, pgprot_t newprot,
47 int prot_numa);
48int vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
49 pmd_t *pmd, pfn_t pfn, bool write);
50int vmf_insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
51 pud_t *pud, 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
94static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
95{
96 if (vma->vm_flags & VM_NOHUGEPAGE)
97 return false;
98
99 if (is_vma_temporary_stack(vma))
100 return false;
101
102 if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
103 return false;
104
105 if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
106 return true;
107
108 if (vma_is_dax(vma))
109 return true;
110
111 if (transparent_hugepage_flags &
112 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
113 return !!(vma->vm_flags & VM_HUGEPAGE);
114
115 return false;
116}
117
118#define transparent_hugepage_use_zero_page() \
119 (transparent_hugepage_flags & \
120 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
121#ifdef CONFIG_DEBUG_VM
122#define transparent_hugepage_debug_cow() \
123 (transparent_hugepage_flags & \
124 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
125#else /* CONFIG_DEBUG_VM */
126#define transparent_hugepage_debug_cow() 0
127#endif /* CONFIG_DEBUG_VM */
128
129extern unsigned long thp_get_unmapped_area(struct file *filp,
130 unsigned long addr, unsigned long len, unsigned long pgoff,
131 unsigned long flags);
132
133extern void prep_transhuge_page(struct page *page);
134extern void free_transhuge_page(struct page *page);
135
136bool can_split_huge_page(struct page *page, int *pextra_pins);
137int split_huge_page_to_list(struct page *page, struct list_head *list);
138static inline int split_huge_page(struct page *page)
139{
140 return split_huge_page_to_list(page, NULL);
141}
142void deferred_split_huge_page(struct page *page);
143
144void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
145 unsigned long address, bool freeze, struct page *page);
146
147#define split_huge_pmd(__vma, __pmd, __address) \
148 do { \
149 pmd_t *____pmd = (__pmd); \
150 if (pmd_trans_huge(*____pmd) \
151 || pmd_devmap(*____pmd)) \
152 __split_huge_pmd(__vma, __pmd, __address, \
153 false, NULL); \
154 } while (0)
155
156
157void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
158 bool freeze, struct page *page);
159
160void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
161 unsigned long address);
162
163#define split_huge_pud(__vma, __pud, __address) \
164 do { \
165 pud_t *____pud = (__pud); \
166 if (pud_trans_huge(*____pud) \
167 || pud_devmap(*____pud)) \
168 __split_huge_pud(__vma, __pud, __address); \
169 } while (0)
170
171extern int hugepage_madvise(struct vm_area_struct *vma,
172 unsigned long *vm_flags, int advice);
173extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
174 unsigned long start,
175 unsigned long end,
176 long adjust_next);
177extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
178 struct vm_area_struct *vma);
179extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
180 struct vm_area_struct *vma);
181/* mmap_sem must be held on entry */
182static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
183 struct vm_area_struct *vma)
184{
185 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
186 if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
187 return __pmd_trans_huge_lock(pmd, vma);
188 else
189 return NULL;
190}
191static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
192 struct vm_area_struct *vma)
193{
194 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
195 if (pud_trans_huge(*pud) || pud_devmap(*pud))
196 return __pud_trans_huge_lock(pud, vma);
197 else
198 return NULL;
199}
200static inline int hpage_nr_pages(struct page *page)
201{
202 if (unlikely(PageTransHuge(page)))
203 return HPAGE_PMD_NR;
204 return 1;
205}
206
207struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
208 pmd_t *pmd, int flags);
209struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
210 pud_t *pud, int flags);
211
212extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
213
214extern struct page *huge_zero_page;
215
216static inline bool is_huge_zero_page(struct page *page)
217{
218 return ACCESS_ONCE(huge_zero_page) == page;
219}
220
221static inline bool is_huge_zero_pmd(pmd_t pmd)
222{
223 return is_huge_zero_page(pmd_page(pmd));
224}
225
226static inline bool is_huge_zero_pud(pud_t pud)
227{
228 return false;
229}
230
231struct page *mm_get_huge_zero_page(struct mm_struct *mm);
232void mm_put_huge_zero_page(struct mm_struct *mm);
233
234#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
235
236#else /* CONFIG_TRANSPARENT_HUGEPAGE */
237#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
238#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
239#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
240
241#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
242#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
243#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
244
245#define hpage_nr_pages(x) 1
246
247static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
248{
249 return false;
250}
251
252static inline void prep_transhuge_page(struct page *page) {}
253
254#define transparent_hugepage_flags 0UL
255
256#define thp_get_unmapped_area NULL
257
258static inline bool
259can_split_huge_page(struct page *page, int *pextra_pins)
260{
261 BUILD_BUG();
262 return false;
263}
264static inline int
265split_huge_page_to_list(struct page *page, struct list_head *list)
266{
267 return 0;
268}
269static inline int split_huge_page(struct page *page)
270{
271 return 0;
272}
273static inline void deferred_split_huge_page(struct page *page) {}
274#define split_huge_pmd(__vma, __pmd, __address) \
275 do { } while (0)
276
277static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
278 unsigned long address, bool freeze, struct page *page) {}
279static inline void split_huge_pmd_address(struct vm_area_struct *vma,
280 unsigned long address, bool freeze, struct page *page) {}
281
282#define split_huge_pud(__vma, __pmd, __address) \
283 do { } while (0)
284
285static inline int hugepage_madvise(struct vm_area_struct *vma,
286 unsigned long *vm_flags, int advice)
287{
288 BUG();
289 return 0;
290}
291static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
292 unsigned long start,
293 unsigned long end,
294 long adjust_next)
295{
296}
297static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
298 struct vm_area_struct *vma)
299{
300 return NULL;
301}
302static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
303 struct vm_area_struct *vma)
304{
305 return NULL;
306}
307
308static inline int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd)
309{
310 return 0;
311}
312
313static inline bool is_huge_zero_page(struct page *page)
314{
315 return false;
316}
317
318static inline bool is_huge_zero_pud(pud_t pud)
319{
320 return false;
321}
322
323static inline void mm_put_huge_zero_page(struct mm_struct *mm)
324{
325 return;
326}
327
328static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
329 unsigned long addr, pmd_t *pmd, int flags)
330{
331 return NULL;
332}
333
334static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
335 unsigned long addr, pud_t *pud, int flags)
336{
337 return NULL;
338}
339#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
340
341#endif /* _LINUX_HUGE_MM_H */