Line data Source code
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 :
10 : vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
11 : 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 *dst_vma, struct vm_area_struct *src_vma);
14 : void huge_pmd_set_accessed(struct vm_fault *vmf);
15 : 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
20 : void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
21 : #else
22 : static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
23 : {
24 : }
25 : #endif
26 :
27 : vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf);
28 : struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
29 : unsigned long addr, pmd_t *pmd,
30 : unsigned int flags);
31 : bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
32 : pmd_t *pmd, unsigned long addr, unsigned long next);
33 : int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd,
34 : unsigned long addr);
35 : int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud,
36 : unsigned long addr);
37 : bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
38 : unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd);
39 : int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
40 : pmd_t *pmd, unsigned long addr, pgprot_t newprot,
41 : unsigned long cp_flags);
42 :
43 : vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write);
44 : vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write);
45 :
46 : enum transparent_hugepage_flag {
47 : TRANSPARENT_HUGEPAGE_UNSUPPORTED,
48 : TRANSPARENT_HUGEPAGE_FLAG,
49 : TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
50 : TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
51 : TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
52 : TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
53 : TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
54 : TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
55 : TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
56 : };
57 :
58 : struct kobject;
59 : struct kobj_attribute;
60 :
61 : ssize_t single_hugepage_flag_store(struct kobject *kobj,
62 : struct kobj_attribute *attr,
63 : const char *buf, size_t count,
64 : enum transparent_hugepage_flag flag);
65 : ssize_t single_hugepage_flag_show(struct kobject *kobj,
66 : struct kobj_attribute *attr, char *buf,
67 : enum transparent_hugepage_flag flag);
68 : extern struct kobj_attribute shmem_enabled_attr;
69 :
70 : #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
71 : #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
72 :
73 : #ifdef CONFIG_TRANSPARENT_HUGEPAGE
74 : #define HPAGE_PMD_SHIFT PMD_SHIFT
75 : #define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
76 : #define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
77 :
78 : #define HPAGE_PUD_SHIFT PUD_SHIFT
79 : #define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
80 : #define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
81 :
82 : extern unsigned long transparent_hugepage_flags;
83 :
84 : #define hugepage_flags_enabled() \
85 : (transparent_hugepage_flags & \
86 : ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
87 : (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
88 : #define hugepage_flags_always() \
89 : (transparent_hugepage_flags & \
90 : (1<<TRANSPARENT_HUGEPAGE_FLAG))
91 :
92 : /*
93 : * Do the below checks:
94 : * - For file vma, check if the linear page offset of vma is
95 : * HPAGE_PMD_NR aligned within the file. The hugepage is
96 : * guaranteed to be hugepage-aligned within the file, but we must
97 : * check that the PMD-aligned addresses in the VMA map to
98 : * PMD-aligned offsets within the file, else the hugepage will
99 : * not be PMD-mappable.
100 : * - For all vmas, check if the haddr is in an aligned HPAGE_PMD_SIZE
101 : * area.
102 : */
103 : static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
104 : unsigned long addr)
105 : {
106 : unsigned long haddr;
107 :
108 : /* Don't have to check pgoff for anonymous vma */
109 : if (!vma_is_anonymous(vma)) {
110 : if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
111 : HPAGE_PMD_NR))
112 : return false;
113 : }
114 :
115 : haddr = addr & HPAGE_PMD_MASK;
116 :
117 : if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
118 : return false;
119 : return true;
120 : }
121 :
122 : static inline bool file_thp_enabled(struct vm_area_struct *vma)
123 : {
124 : struct inode *inode;
125 :
126 : if (!vma->vm_file)
127 : return false;
128 :
129 : inode = vma->vm_file->f_inode;
130 :
131 : return (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) &&
132 : (vma->vm_flags & VM_EXEC) &&
133 : !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode);
134 : }
135 :
136 : bool hugepage_vma_check(struct vm_area_struct *vma, unsigned long vm_flags,
137 : bool smaps, bool in_pf, bool enforce_sysfs);
138 :
139 : #define transparent_hugepage_use_zero_page() \
140 : (transparent_hugepage_flags & \
141 : (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
142 :
143 : unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
144 : unsigned long len, unsigned long pgoff, unsigned long flags);
145 :
146 : void prep_transhuge_page(struct page *page);
147 : void free_transhuge_page(struct page *page);
148 :
149 : bool can_split_folio(struct folio *folio, int *pextra_pins);
150 : int split_huge_page_to_list(struct page *page, struct list_head *list);
151 : static inline int split_huge_page(struct page *page)
152 : {
153 : return split_huge_page_to_list(page, NULL);
154 : }
155 : void deferred_split_folio(struct folio *folio);
156 :
157 : void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
158 : unsigned long address, bool freeze, struct folio *folio);
159 :
160 : #define split_huge_pmd(__vma, __pmd, __address) \
161 : do { \
162 : pmd_t *____pmd = (__pmd); \
163 : if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
164 : || pmd_devmap(*____pmd)) \
165 : __split_huge_pmd(__vma, __pmd, __address, \
166 : false, NULL); \
167 : } while (0)
168 :
169 :
170 : void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
171 : bool freeze, struct folio *folio);
172 :
173 : void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
174 : unsigned long address);
175 :
176 : #define split_huge_pud(__vma, __pud, __address) \
177 : do { \
178 : pud_t *____pud = (__pud); \
179 : if (pud_trans_huge(*____pud) \
180 : || pud_devmap(*____pud)) \
181 : __split_huge_pud(__vma, __pud, __address); \
182 : } while (0)
183 :
184 : int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags,
185 : int advice);
186 : int madvise_collapse(struct vm_area_struct *vma,
187 : struct vm_area_struct **prev,
188 : unsigned long start, unsigned long end);
189 : void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
190 : unsigned long end, long adjust_next);
191 : spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma);
192 : spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma);
193 :
194 : static inline int is_swap_pmd(pmd_t pmd)
195 : {
196 : return !pmd_none(pmd) && !pmd_present(pmd);
197 : }
198 :
199 : /* mmap_lock must be held on entry */
200 : static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
201 : struct vm_area_struct *vma)
202 : {
203 : if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
204 : return __pmd_trans_huge_lock(pmd, vma);
205 : else
206 : return NULL;
207 : }
208 : static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
209 : struct vm_area_struct *vma)
210 : {
211 : if (pud_trans_huge(*pud) || pud_devmap(*pud))
212 : return __pud_trans_huge_lock(pud, vma);
213 : else
214 : return NULL;
215 : }
216 :
217 : /**
218 : * folio_test_pmd_mappable - Can we map this folio with a PMD?
219 : * @folio: The folio to test
220 : */
221 : static inline bool folio_test_pmd_mappable(struct folio *folio)
222 : {
223 : return folio_order(folio) >= HPAGE_PMD_ORDER;
224 : }
225 :
226 : struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
227 : pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
228 : struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
229 : pud_t *pud, int flags, struct dev_pagemap **pgmap);
230 :
231 : vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf);
232 :
233 : extern struct page *huge_zero_page;
234 : extern unsigned long huge_zero_pfn;
235 :
236 : static inline bool is_huge_zero_page(struct page *page)
237 : {
238 : return READ_ONCE(huge_zero_page) == page;
239 : }
240 :
241 : static inline bool is_huge_zero_pmd(pmd_t pmd)
242 : {
243 : return pmd_present(pmd) && READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd);
244 : }
245 :
246 : static inline bool is_huge_zero_pud(pud_t pud)
247 : {
248 : return false;
249 : }
250 :
251 : struct page *mm_get_huge_zero_page(struct mm_struct *mm);
252 : void mm_put_huge_zero_page(struct mm_struct *mm);
253 :
254 : #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
255 :
256 : static inline bool thp_migration_supported(void)
257 : {
258 : return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
259 : }
260 :
261 : #else /* CONFIG_TRANSPARENT_HUGEPAGE */
262 : #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
263 : #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
264 : #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
265 :
266 : #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
267 : #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
268 : #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
269 :
270 : static inline bool folio_test_pmd_mappable(struct folio *folio)
271 : {
272 : return false;
273 : }
274 :
275 : static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
276 : unsigned long addr)
277 : {
278 : return false;
279 : }
280 :
281 : static inline bool hugepage_vma_check(struct vm_area_struct *vma,
282 : unsigned long vm_flags, bool smaps,
283 : bool in_pf, bool enforce_sysfs)
284 : {
285 : return false;
286 : }
287 :
288 : static inline void prep_transhuge_page(struct page *page) {}
289 :
290 : #define transparent_hugepage_flags 0UL
291 :
292 : #define thp_get_unmapped_area NULL
293 :
294 : static inline bool
295 : can_split_folio(struct folio *folio, int *pextra_pins)
296 : {
297 : return false;
298 : }
299 : static inline int
300 : split_huge_page_to_list(struct page *page, struct list_head *list)
301 : {
302 : return 0;
303 : }
304 : static inline int split_huge_page(struct page *page)
305 : {
306 : return 0;
307 : }
308 : static inline void deferred_split_folio(struct folio *folio) {}
309 : #define split_huge_pmd(__vma, __pmd, __address) \
310 : do { } while (0)
311 :
312 : static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
313 : unsigned long address, bool freeze, struct folio *folio) {}
314 : static inline void split_huge_pmd_address(struct vm_area_struct *vma,
315 : unsigned long address, bool freeze, struct folio *folio) {}
316 :
317 : #define split_huge_pud(__vma, __pmd, __address) \
318 : do { } while (0)
319 :
320 : static inline int hugepage_madvise(struct vm_area_struct *vma,
321 : unsigned long *vm_flags, int advice)
322 : {
323 : return -EINVAL;
324 : }
325 :
326 : static inline int madvise_collapse(struct vm_area_struct *vma,
327 : struct vm_area_struct **prev,
328 : unsigned long start, unsigned long end)
329 : {
330 : return -EINVAL;
331 : }
332 :
333 : static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
334 : unsigned long start,
335 : unsigned long end,
336 : long adjust_next)
337 : {
338 : }
339 : static inline int is_swap_pmd(pmd_t pmd)
340 : {
341 : return 0;
342 : }
343 : static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
344 : struct vm_area_struct *vma)
345 : {
346 : return NULL;
347 : }
348 : static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
349 : struct vm_area_struct *vma)
350 : {
351 : return NULL;
352 : }
353 :
354 : static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
355 : {
356 : return 0;
357 : }
358 :
359 : static inline bool is_huge_zero_page(struct page *page)
360 : {
361 : return false;
362 : }
363 :
364 : static inline bool is_huge_zero_pmd(pmd_t pmd)
365 : {
366 : return false;
367 : }
368 :
369 : static inline bool is_huge_zero_pud(pud_t pud)
370 : {
371 : return false;
372 : }
373 :
374 : static inline void mm_put_huge_zero_page(struct mm_struct *mm)
375 : {
376 : return;
377 : }
378 :
379 : static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
380 : unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
381 : {
382 : return NULL;
383 : }
384 :
385 : static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
386 : unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
387 : {
388 : return NULL;
389 : }
390 :
391 : static inline bool thp_migration_supported(void)
392 : {
393 : return false;
394 : }
395 : #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
396 :
397 : static inline int split_folio_to_list(struct folio *folio,
398 : struct list_head *list)
399 : {
400 0 : return split_huge_page_to_list(&folio->page, list);
401 : }
402 :
403 : static inline int split_folio(struct folio *folio)
404 : {
405 0 : return split_folio_to_list(folio, NULL);
406 : }
407 :
408 : /*
409 : * archs that select ARCH_WANTS_THP_SWAP but don't support THP_SWP due to
410 : * limitations in the implementation like arm64 MTE can override this to
411 : * false
412 : */
413 : #ifndef arch_thp_swp_supported
414 : static inline bool arch_thp_swp_supported(void)
415 : {
416 : return true;
417 : }
418 : #endif
419 :
420 : #endif /* _LINUX_HUGE_MM_H */
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