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
113
114
115
116
117 if (vma_is_dax(vma))
118 return true;
119
120 if (transparent_hugepage_flags &
121 (1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
122 return !!(vma->vm_flags & VM_HUGEPAGE);
123
124 return false;
125}
126
127bool transparent_hugepage_enabled(struct vm_area_struct *vma);
128
129#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
130
131static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
132 unsigned long haddr)
133{
134
135 if (!vma_is_anonymous(vma)) {
136 if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
137 (vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
138 return false;
139 }
140
141 if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
142 return false;
143 return true;
144}
145
146#define transparent_hugepage_use_zero_page() \
147 (transparent_hugepage_flags & \
148 (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
149#ifdef CONFIG_DEBUG_VM
150#define transparent_hugepage_debug_cow() \
151 (transparent_hugepage_flags & \
152 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
153#else
154#define transparent_hugepage_debug_cow() 0
155#endif
156
157extern unsigned long thp_get_unmapped_area(struct file *filp,
158 unsigned long addr, unsigned long len, unsigned long pgoff,
159 unsigned long flags);
160
161extern void prep_transhuge_page(struct page *page);
162extern void free_transhuge_page(struct page *page);
163
164bool can_split_huge_page(struct page *page, int *pextra_pins);
165int split_huge_page_to_list(struct page *page, struct list_head *list);
166static inline int split_huge_page(struct page *page)
167{
168 return split_huge_page_to_list(page, NULL);
169}
170void deferred_split_huge_page(struct page *page);
171
172void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
173 unsigned long address, bool freeze, struct page *page);
174
175#define split_huge_pmd(__vma, __pmd, __address) \
176 do { \
177 pmd_t *____pmd = (__pmd); \
178 if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
179 || pmd_devmap(*____pmd)) \
180 __split_huge_pmd(__vma, __pmd, __address, \
181 false, NULL); \
182 } while (0)
183
184
185void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
186 bool freeze, struct page *page);
187
188void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
189 unsigned long address);
190
191#define split_huge_pud(__vma, __pud, __address) \
192 do { \
193 pud_t *____pud = (__pud); \
194 if (pud_trans_huge(*____pud) \
195 || pud_devmap(*____pud)) \
196 __split_huge_pud(__vma, __pud, __address); \
197 } while (0)
198
199extern int hugepage_madvise(struct vm_area_struct *vma,
200 unsigned long *vm_flags, int advice);
201extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
202 unsigned long start,
203 unsigned long end,
204 long adjust_next);
205extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
206 struct vm_area_struct *vma);
207extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
208 struct vm_area_struct *vma);
209
210static inline int is_swap_pmd(pmd_t pmd)
211{
212 return !pmd_none(pmd) && !pmd_present(pmd);
213}
214
215
216static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
217 struct vm_area_struct *vma)
218{
219 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
220 if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
221 return __pmd_trans_huge_lock(pmd, vma);
222 else
223 return NULL;
224}
225static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
226 struct vm_area_struct *vma)
227{
228 VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
229 if (pud_trans_huge(*pud) || pud_devmap(*pud))
230 return __pud_trans_huge_lock(pud, vma);
231 else
232 return NULL;
233}
234static inline int hpage_nr_pages(struct page *page)
235{
236 if (unlikely(PageTransHuge(page)))
237 return HPAGE_PMD_NR;
238 return 1;
239}
240
241struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
242 pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
243struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
244 pud_t *pud, int flags, struct dev_pagemap **pgmap);
245
246extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
247
248extern struct page *huge_zero_page;
249
250static inline bool is_huge_zero_page(struct page *page)
251{
252 return READ_ONCE(huge_zero_page) == page;
253}
254
255static inline bool is_huge_zero_pmd(pmd_t pmd)
256{
257 return is_huge_zero_page(pmd_page(pmd));
258}
259
260static inline bool is_huge_zero_pud(pud_t pud)
261{
262 return false;
263}
264
265struct page *mm_get_huge_zero_page(struct mm_struct *mm);
266void mm_put_huge_zero_page(struct mm_struct *mm);
267
268#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
269
270static inline bool thp_migration_supported(void)
271{
272 return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
273}
274
275static inline struct list_head *page_deferred_list(struct page *page)
276{
277
278
279
280
281 return &page[2].deferred_list;
282}
283
284#else
285#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
286#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
287#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
288
289#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
290#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
291#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
292
293#define hpage_nr_pages(x) 1
294
295static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
296{
297 return false;
298}
299
300static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
301{
302 return false;
303}
304
305static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
306 unsigned long haddr)
307{
308 return false;
309}
310
311static inline void prep_transhuge_page(struct page *page) {}
312
313#define transparent_hugepage_flags 0UL
314
315#define thp_get_unmapped_area NULL
316
317static inline bool
318can_split_huge_page(struct page *page, int *pextra_pins)
319{
320 BUILD_BUG();
321 return false;
322}
323static inline int
324split_huge_page_to_list(struct page *page, struct list_head *list)
325{
326 return 0;
327}
328static inline int split_huge_page(struct page *page)
329{
330 return 0;
331}
332static inline void deferred_split_huge_page(struct page *page) {}
333#define split_huge_pmd(__vma, __pmd, __address) \
334 do { } while (0)
335
336static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
337 unsigned long address, bool freeze, struct page *page) {}
338static inline void split_huge_pmd_address(struct vm_area_struct *vma,
339 unsigned long address, bool freeze, struct page *page) {}
340
341#define split_huge_pud(__vma, __pmd, __address) \
342 do { } while (0)
343
344static inline int hugepage_madvise(struct vm_area_struct *vma,
345 unsigned long *vm_flags, int advice)
346{
347 BUG();
348 return 0;
349}
350static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
351 unsigned long start,
352 unsigned long end,
353 long adjust_next)
354{
355}
356static inline int is_swap_pmd(pmd_t pmd)
357{
358 return 0;
359}
360static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
361 struct vm_area_struct *vma)
362{
363 return NULL;
364}
365static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
366 struct vm_area_struct *vma)
367{
368 return NULL;
369}
370
371static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
372 pmd_t orig_pmd)
373{
374 return 0;
375}
376
377static inline bool is_huge_zero_page(struct page *page)
378{
379 return false;
380}
381
382static inline bool is_huge_zero_pud(pud_t pud)
383{
384 return false;
385}
386
387static inline void mm_put_huge_zero_page(struct mm_struct *mm)
388{
389 return;
390}
391
392static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
393 unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
394{
395 return NULL;
396}
397
398static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
399 unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
400{
401 return NULL;
402}
403
404static inline bool thp_migration_supported(void)
405{
406 return false;
407}
408#endif
409
410#endif
411
