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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
ca5999fd MR |
2 | #ifndef _LINUX_PGTABLE_H |
3 | #define _LINUX_PGTABLE_H | |
1da177e4 | 4 | |
f25748e3 | 5 | #include <linux/pfn.h> |
ca5999fd | 6 | #include <asm/pgtable.h> |
f25748e3 | 7 | |
673eae82 | 8 | #ifndef __ASSEMBLY__ |
9535239f | 9 | #ifdef CONFIG_MMU |
673eae82 | 10 | |
fbd71844 | 11 | #include <linux/mm_types.h> |
187f1882 | 12 | #include <linux/bug.h> |
e61ce6ad | 13 | #include <linux/errno.h> |
5a281062 | 14 | #include <asm-generic/pgtable_uffd.h> |
fbd71844 | 15 | |
c2febafc KS |
16 | #if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \ |
17 | defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS | |
18 | #error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{P4D,PUD,PMD}_FOLDED | |
235a8f02 KS |
19 | #endif |
20 | ||
6ee8630e HD |
21 | /* |
22 | * On almost all architectures and configurations, 0 can be used as the | |
23 | * upper ceiling to free_pgtables(): on many architectures it has the same | |
24 | * effect as using TASK_SIZE. However, there is one configuration which | |
25 | * must impose a more careful limit, to avoid freeing kernel pgtables. | |
26 | */ | |
27 | #ifndef USER_PGTABLES_CEILING | |
28 | #define USER_PGTABLES_CEILING 0UL | |
29 | #endif | |
30 | ||
974b9b2c MR |
31 | /* |
32 | * A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD] | |
33 | * | |
34 | * The pXx_index() functions return the index of the entry in the page | |
35 | * table page which would control the given virtual address | |
36 | * | |
37 | * As these functions may be used by the same code for different levels of | |
38 | * the page table folding, they are always available, regardless of | |
39 | * CONFIG_PGTABLE_LEVELS value. For the folded levels they simply return 0 | |
40 | * because in such cases PTRS_PER_PxD equals 1. | |
41 | */ | |
42 | ||
43 | static inline unsigned long pte_index(unsigned long address) | |
44 | { | |
45 | return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1); | |
46 | } | |
47 | ||
48 | #ifndef pmd_index | |
49 | static inline unsigned long pmd_index(unsigned long address) | |
50 | { | |
51 | return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); | |
52 | } | |
53 | #define pmd_index pmd_index | |
54 | #endif | |
55 | ||
56 | #ifndef pud_index | |
57 | static inline unsigned long pud_index(unsigned long address) | |
58 | { | |
59 | return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1); | |
60 | } | |
61 | #define pud_index pud_index | |
62 | #endif | |
63 | ||
64 | #ifndef pgd_index | |
65 | /* Must be a compile-time constant, so implement it as a macro */ | |
66 | #define pgd_index(a) (((a) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) | |
67 | #endif | |
68 | ||
69 | #ifndef pte_offset_kernel | |
70 | static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address) | |
71 | { | |
72 | return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address); | |
73 | } | |
74 | #define pte_offset_kernel pte_offset_kernel | |
75 | #endif | |
76 | ||
77 | #if defined(CONFIG_HIGHPTE) | |
78 | #define pte_offset_map(dir, address) \ | |
79 | ((pte_t *)kmap_atomic(pmd_page(*(dir))) + \ | |
80 | pte_index((address))) | |
81 | #define pte_unmap(pte) kunmap_atomic((pte)) | |
82 | #else | |
83 | #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address)) | |
84 | #define pte_unmap(pte) ((void)(pte)) /* NOP */ | |
85 | #endif | |
86 | ||
87 | /* Find an entry in the second-level page table.. */ | |
88 | #ifndef pmd_offset | |
89 | static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) | |
90 | { | |
91 | return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); | |
92 | } | |
93 | #define pmd_offset pmd_offset | |
94 | #endif | |
95 | ||
96 | #ifndef pud_offset | |
97 | static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) | |
98 | { | |
99 | return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address); | |
100 | } | |
101 | #define pud_offset pud_offset | |
102 | #endif | |
103 | ||
104 | static inline pgd_t *pgd_offset_pgd(pgd_t *pgd, unsigned long address) | |
105 | { | |
106 | return (pgd + pgd_index(address)); | |
107 | }; | |
108 | ||
109 | /* | |
110 | * a shortcut to get a pgd_t in a given mm | |
111 | */ | |
112 | #ifndef pgd_offset | |
113 | #define pgd_offset(mm, address) pgd_offset_pgd((mm)->pgd, (address)) | |
114 | #endif | |
115 | ||
116 | /* | |
117 | * a shortcut which implies the use of the kernel's pgd, instead | |
118 | * of a process's | |
119 | */ | |
120 | #define pgd_offset_k(address) pgd_offset(&init_mm, (address)) | |
121 | ||
e05c7b1f MR |
122 | /* |
123 | * In many cases it is known that a virtual address is mapped at PMD or PTE | |
124 | * level, so instead of traversing all the page table levels, we can get a | |
125 | * pointer to the PMD entry in user or kernel page table or translate a virtual | |
126 | * address to the pointer in the PTE in the kernel page tables with simple | |
127 | * helpers. | |
128 | */ | |
129 | static inline pmd_t *pmd_off(struct mm_struct *mm, unsigned long va) | |
130 | { | |
131 | return pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, va), va), va), va); | |
132 | } | |
133 | ||
134 | static inline pmd_t *pmd_off_k(unsigned long va) | |
135 | { | |
136 | return pmd_offset(pud_offset(p4d_offset(pgd_offset_k(va), va), va), va); | |
137 | } | |
138 | ||
139 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
140 | { | |
141 | pmd_t *pmd = pmd_off_k(vaddr); | |
142 | ||
143 | return pmd_none(*pmd) ? NULL : pte_offset_kernel(pmd, vaddr); | |
144 | } | |
145 | ||
1da177e4 | 146 | #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
e2cda322 AA |
147 | extern int ptep_set_access_flags(struct vm_area_struct *vma, |
148 | unsigned long address, pte_t *ptep, | |
149 | pte_t entry, int dirty); | |
150 | #endif | |
151 | ||
152 | #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS | |
bd5e88ad | 153 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e2cda322 AA |
154 | extern int pmdp_set_access_flags(struct vm_area_struct *vma, |
155 | unsigned long address, pmd_t *pmdp, | |
156 | pmd_t entry, int dirty); | |
a00cc7d9 MW |
157 | extern int pudp_set_access_flags(struct vm_area_struct *vma, |
158 | unsigned long address, pud_t *pudp, | |
159 | pud_t entry, int dirty); | |
bd5e88ad VG |
160 | #else |
161 | static inline int pmdp_set_access_flags(struct vm_area_struct *vma, | |
162 | unsigned long address, pmd_t *pmdp, | |
163 | pmd_t entry, int dirty) | |
164 | { | |
165 | BUILD_BUG(); | |
166 | return 0; | |
167 | } | |
a00cc7d9 MW |
168 | static inline int pudp_set_access_flags(struct vm_area_struct *vma, |
169 | unsigned long address, pud_t *pudp, | |
170 | pud_t entry, int dirty) | |
171 | { | |
172 | BUILD_BUG(); | |
173 | return 0; | |
174 | } | |
bd5e88ad | 175 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
1da177e4 LT |
176 | #endif |
177 | ||
178 | #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
e2cda322 AA |
179 | static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, |
180 | unsigned long address, | |
181 | pte_t *ptep) | |
182 | { | |
183 | pte_t pte = *ptep; | |
184 | int r = 1; | |
185 | if (!pte_young(pte)) | |
186 | r = 0; | |
187 | else | |
188 | set_pte_at(vma->vm_mm, address, ptep, pte_mkold(pte)); | |
189 | return r; | |
190 | } | |
191 | #endif | |
192 | ||
193 | #ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG | |
194 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
195 | static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, | |
196 | unsigned long address, | |
197 | pmd_t *pmdp) | |
198 | { | |
199 | pmd_t pmd = *pmdp; | |
200 | int r = 1; | |
201 | if (!pmd_young(pmd)) | |
202 | r = 0; | |
203 | else | |
204 | set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd)); | |
205 | return r; | |
206 | } | |
bd5e88ad | 207 | #else |
e2cda322 AA |
208 | static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, |
209 | unsigned long address, | |
210 | pmd_t *pmdp) | |
211 | { | |
bd5e88ad | 212 | BUILD_BUG(); |
e2cda322 AA |
213 | return 0; |
214 | } | |
215 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1da177e4 LT |
216 | #endif |
217 | ||
218 | #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH | |
e2cda322 AA |
219 | int ptep_clear_flush_young(struct vm_area_struct *vma, |
220 | unsigned long address, pte_t *ptep); | |
221 | #endif | |
222 | ||
223 | #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH | |
bd5e88ad VG |
224 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
225 | extern int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
226 | unsigned long address, pmd_t *pmdp); | |
227 | #else | |
228 | /* | |
229 | * Despite relevant to THP only, this API is called from generic rmap code | |
230 | * under PageTransHuge(), hence needs a dummy implementation for !THP | |
231 | */ | |
232 | static inline int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
233 | unsigned long address, pmd_t *pmdp) | |
234 | { | |
235 | BUILD_BUG(); | |
236 | return 0; | |
237 | } | |
238 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1da177e4 LT |
239 | #endif |
240 | ||
1da177e4 | 241 | #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR |
e2cda322 AA |
242 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, |
243 | unsigned long address, | |
244 | pte_t *ptep) | |
245 | { | |
246 | pte_t pte = *ptep; | |
247 | pte_clear(mm, address, ptep); | |
248 | return pte; | |
249 | } | |
250 | #endif | |
251 | ||
e2cda322 | 252 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
a00cc7d9 | 253 | #ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR |
8809aa2d AK |
254 | static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, |
255 | unsigned long address, | |
256 | pmd_t *pmdp) | |
e2cda322 AA |
257 | { |
258 | pmd_t pmd = *pmdp; | |
2d28a227 | 259 | pmd_clear(pmdp); |
e2cda322 | 260 | return pmd; |
49b24d6b | 261 | } |
a00cc7d9 MW |
262 | #endif /* __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR */ |
263 | #ifndef __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR | |
264 | static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, | |
265 | unsigned long address, | |
266 | pud_t *pudp) | |
267 | { | |
268 | pud_t pud = *pudp; | |
269 | ||
270 | pud_clear(pudp); | |
271 | return pud; | |
272 | } | |
273 | #endif /* __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR */ | |
e2cda322 | 274 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
1da177e4 | 275 | |
fcbe08d6 | 276 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
a00cc7d9 | 277 | #ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL |
93a98695 | 278 | static inline pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma, |
fcbe08d6 MS |
279 | unsigned long address, pmd_t *pmdp, |
280 | int full) | |
281 | { | |
93a98695 | 282 | return pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); |
fcbe08d6 | 283 | } |
fcbe08d6 MS |
284 | #endif |
285 | ||
a00cc7d9 MW |
286 | #ifndef __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR_FULL |
287 | static inline pud_t pudp_huge_get_and_clear_full(struct mm_struct *mm, | |
288 | unsigned long address, pud_t *pudp, | |
289 | int full) | |
290 | { | |
291 | return pudp_huge_get_and_clear(mm, address, pudp); | |
292 | } | |
293 | #endif | |
294 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
295 | ||
a600388d | 296 | #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL |
e2cda322 AA |
297 | static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, |
298 | unsigned long address, pte_t *ptep, | |
299 | int full) | |
300 | { | |
301 | pte_t pte; | |
302 | pte = ptep_get_and_clear(mm, address, ptep); | |
303 | return pte; | |
304 | } | |
a600388d ZA |
305 | #endif |
306 | ||
7df67697 BM |
307 | |
308 | /* | |
309 | * If two threads concurrently fault at the same page, the thread that | |
310 | * won the race updates the PTE and its local TLB/Cache. The other thread | |
311 | * gives up, simply does nothing, and continues; on architectures where | |
312 | * software can update TLB, local TLB can be updated here to avoid next page | |
313 | * fault. This function updates TLB only, do nothing with cache or others. | |
314 | * It is the difference with function update_mmu_cache. | |
315 | */ | |
316 | #ifndef __HAVE_ARCH_UPDATE_MMU_TLB | |
317 | static inline void update_mmu_tlb(struct vm_area_struct *vma, | |
318 | unsigned long address, pte_t *ptep) | |
319 | { | |
320 | } | |
321 | #define __HAVE_ARCH_UPDATE_MMU_TLB | |
322 | #endif | |
323 | ||
9888a1ca ZA |
324 | /* |
325 | * Some architectures may be able to avoid expensive synchronization | |
326 | * primitives when modifications are made to PTE's which are already | |
327 | * not present, or in the process of an address space destruction. | |
328 | */ | |
329 | #ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL | |
e2cda322 AA |
330 | static inline void pte_clear_not_present_full(struct mm_struct *mm, |
331 | unsigned long address, | |
332 | pte_t *ptep, | |
333 | int full) | |
334 | { | |
335 | pte_clear(mm, address, ptep); | |
336 | } | |
a600388d ZA |
337 | #endif |
338 | ||
1da177e4 | 339 | #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH |
e2cda322 AA |
340 | extern pte_t ptep_clear_flush(struct vm_area_struct *vma, |
341 | unsigned long address, | |
342 | pte_t *ptep); | |
343 | #endif | |
344 | ||
8809aa2d AK |
345 | #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH |
346 | extern pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, | |
e2cda322 AA |
347 | unsigned long address, |
348 | pmd_t *pmdp); | |
a00cc7d9 MW |
349 | extern pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, |
350 | unsigned long address, | |
351 | pud_t *pudp); | |
1da177e4 LT |
352 | #endif |
353 | ||
354 | #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT | |
8c65b4a6 | 355 | struct mm_struct; |
1da177e4 LT |
356 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) |
357 | { | |
358 | pte_t old_pte = *ptep; | |
359 | set_pte_at(mm, address, ptep, pte_wrprotect(old_pte)); | |
360 | } | |
361 | #endif | |
362 | ||
44bf431b BM |
363 | /* |
364 | * On some architectures hardware does not set page access bit when accessing | |
365 | * memory page, it is responsibilty of software setting this bit. It brings | |
366 | * out extra page fault penalty to track page access bit. For optimization page | |
367 | * access bit can be set during all page fault flow on these arches. | |
368 | * To be differentiate with macro pte_mkyoung, this macro is used on platforms | |
369 | * where software maintains page access bit. | |
370 | */ | |
371 | #ifndef pte_sw_mkyoung | |
372 | static inline pte_t pte_sw_mkyoung(pte_t pte) | |
373 | { | |
374 | return pte; | |
375 | } | |
376 | #define pte_sw_mkyoung pte_sw_mkyoung | |
377 | #endif | |
378 | ||
288bc549 AK |
379 | #ifndef pte_savedwrite |
380 | #define pte_savedwrite pte_write | |
381 | #endif | |
382 | ||
383 | #ifndef pte_mk_savedwrite | |
384 | #define pte_mk_savedwrite pte_mkwrite | |
385 | #endif | |
386 | ||
595cd8f2 AK |
387 | #ifndef pte_clear_savedwrite |
388 | #define pte_clear_savedwrite pte_wrprotect | |
389 | #endif | |
390 | ||
288bc549 AK |
391 | #ifndef pmd_savedwrite |
392 | #define pmd_savedwrite pmd_write | |
393 | #endif | |
394 | ||
395 | #ifndef pmd_mk_savedwrite | |
396 | #define pmd_mk_savedwrite pmd_mkwrite | |
397 | #endif | |
398 | ||
595cd8f2 AK |
399 | #ifndef pmd_clear_savedwrite |
400 | #define pmd_clear_savedwrite pmd_wrprotect | |
401 | #endif | |
402 | ||
e2cda322 AA |
403 | #ifndef __HAVE_ARCH_PMDP_SET_WRPROTECT |
404 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
405 | static inline void pmdp_set_wrprotect(struct mm_struct *mm, | |
406 | unsigned long address, pmd_t *pmdp) | |
407 | { | |
408 | pmd_t old_pmd = *pmdp; | |
409 | set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd)); | |
410 | } | |
bd5e88ad | 411 | #else |
e2cda322 AA |
412 | static inline void pmdp_set_wrprotect(struct mm_struct *mm, |
413 | unsigned long address, pmd_t *pmdp) | |
414 | { | |
bd5e88ad | 415 | BUILD_BUG(); |
e2cda322 AA |
416 | } |
417 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
418 | #endif | |
a00cc7d9 MW |
419 | #ifndef __HAVE_ARCH_PUDP_SET_WRPROTECT |
420 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
421 | static inline void pudp_set_wrprotect(struct mm_struct *mm, | |
422 | unsigned long address, pud_t *pudp) | |
423 | { | |
424 | pud_t old_pud = *pudp; | |
425 | ||
426 | set_pud_at(mm, address, pudp, pud_wrprotect(old_pud)); | |
427 | } | |
428 | #else | |
429 | static inline void pudp_set_wrprotect(struct mm_struct *mm, | |
430 | unsigned long address, pud_t *pudp) | |
431 | { | |
432 | BUILD_BUG(); | |
433 | } | |
434 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
435 | #endif | |
e2cda322 | 436 | |
15a25b2e AK |
437 | #ifndef pmdp_collapse_flush |
438 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
f28b6ff8 AK |
439 | extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, |
440 | unsigned long address, pmd_t *pmdp); | |
15a25b2e AK |
441 | #else |
442 | static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, | |
443 | unsigned long address, | |
444 | pmd_t *pmdp) | |
445 | { | |
446 | BUILD_BUG(); | |
447 | return *pmdp; | |
448 | } | |
449 | #define pmdp_collapse_flush pmdp_collapse_flush | |
450 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
451 | #endif | |
452 | ||
e3ebcf64 | 453 | #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT |
6b0b50b0 AK |
454 | extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, |
455 | pgtable_t pgtable); | |
e3ebcf64 GS |
456 | #endif |
457 | ||
458 | #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW | |
6b0b50b0 | 459 | extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); |
e3ebcf64 GS |
460 | #endif |
461 | ||
c58f0bb7 KS |
462 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
463 | /* | |
464 | * This is an implementation of pmdp_establish() that is only suitable for an | |
465 | * architecture that doesn't have hardware dirty/accessed bits. In this case we | |
466 | * can't race with CPU which sets these bits and non-atomic aproach is fine. | |
467 | */ | |
468 | static inline pmd_t generic_pmdp_establish(struct vm_area_struct *vma, | |
469 | unsigned long address, pmd_t *pmdp, pmd_t pmd) | |
470 | { | |
471 | pmd_t old_pmd = *pmdp; | |
472 | set_pmd_at(vma->vm_mm, address, pmdp, pmd); | |
473 | return old_pmd; | |
474 | } | |
475 | #endif | |
476 | ||
46dcde73 | 477 | #ifndef __HAVE_ARCH_PMDP_INVALIDATE |
d52605d7 | 478 | extern pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, |
46dcde73 GS |
479 | pmd_t *pmdp); |
480 | #endif | |
481 | ||
1da177e4 | 482 | #ifndef __HAVE_ARCH_PTE_SAME |
e2cda322 AA |
483 | static inline int pte_same(pte_t pte_a, pte_t pte_b) |
484 | { | |
485 | return pte_val(pte_a) == pte_val(pte_b); | |
486 | } | |
487 | #endif | |
488 | ||
45961722 KW |
489 | #ifndef __HAVE_ARCH_PTE_UNUSED |
490 | /* | |
491 | * Some architectures provide facilities to virtualization guests | |
492 | * so that they can flag allocated pages as unused. This allows the | |
493 | * host to transparently reclaim unused pages. This function returns | |
494 | * whether the pte's page is unused. | |
495 | */ | |
496 | static inline int pte_unused(pte_t pte) | |
497 | { | |
498 | return 0; | |
499 | } | |
500 | #endif | |
501 | ||
e7884f8e KS |
502 | #ifndef pte_access_permitted |
503 | #define pte_access_permitted(pte, write) \ | |
504 | (pte_present(pte) && (!(write) || pte_write(pte))) | |
505 | #endif | |
506 | ||
507 | #ifndef pmd_access_permitted | |
508 | #define pmd_access_permitted(pmd, write) \ | |
509 | (pmd_present(pmd) && (!(write) || pmd_write(pmd))) | |
510 | #endif | |
511 | ||
512 | #ifndef pud_access_permitted | |
513 | #define pud_access_permitted(pud, write) \ | |
514 | (pud_present(pud) && (!(write) || pud_write(pud))) | |
515 | #endif | |
516 | ||
517 | #ifndef p4d_access_permitted | |
518 | #define p4d_access_permitted(p4d, write) \ | |
519 | (p4d_present(p4d) && (!(write) || p4d_write(p4d))) | |
520 | #endif | |
521 | ||
522 | #ifndef pgd_access_permitted | |
523 | #define pgd_access_permitted(pgd, write) \ | |
524 | (pgd_present(pgd) && (!(write) || pgd_write(pgd))) | |
525 | #endif | |
526 | ||
e2cda322 | 527 | #ifndef __HAVE_ARCH_PMD_SAME |
e2cda322 AA |
528 | static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) |
529 | { | |
530 | return pmd_val(pmd_a) == pmd_val(pmd_b); | |
531 | } | |
a00cc7d9 MW |
532 | |
533 | static inline int pud_same(pud_t pud_a, pud_t pud_b) | |
534 | { | |
535 | return pud_val(pud_a) == pud_val(pud_b); | |
536 | } | |
1da177e4 LT |
537 | #endif |
538 | ||
0cebbb60 DW |
539 | #ifndef __HAVE_ARCH_P4D_SAME |
540 | static inline int p4d_same(p4d_t p4d_a, p4d_t p4d_b) | |
541 | { | |
542 | return p4d_val(p4d_a) == p4d_val(p4d_b); | |
543 | } | |
544 | #endif | |
545 | ||
546 | #ifndef __HAVE_ARCH_PGD_SAME | |
547 | static inline int pgd_same(pgd_t pgd_a, pgd_t pgd_b) | |
548 | { | |
549 | return pgd_val(pgd_a) == pgd_val(pgd_b); | |
550 | } | |
551 | #endif | |
552 | ||
4369deaa DW |
553 | /* |
554 | * Use set_p*_safe(), and elide TLB flushing, when confident that *no* | |
555 | * TLB flush will be required as a result of the "set". For example, use | |
556 | * in scenarios where it is known ahead of time that the routine is | |
557 | * setting non-present entries, or re-setting an existing entry to the | |
558 | * same value. Otherwise, use the typical "set" helpers and flush the | |
559 | * TLB. | |
560 | */ | |
561 | #define set_pte_safe(ptep, pte) \ | |
562 | ({ \ | |
563 | WARN_ON_ONCE(pte_present(*ptep) && !pte_same(*ptep, pte)); \ | |
564 | set_pte(ptep, pte); \ | |
565 | }) | |
566 | ||
567 | #define set_pmd_safe(pmdp, pmd) \ | |
568 | ({ \ | |
569 | WARN_ON_ONCE(pmd_present(*pmdp) && !pmd_same(*pmdp, pmd)); \ | |
570 | set_pmd(pmdp, pmd); \ | |
571 | }) | |
572 | ||
573 | #define set_pud_safe(pudp, pud) \ | |
574 | ({ \ | |
575 | WARN_ON_ONCE(pud_present(*pudp) && !pud_same(*pudp, pud)); \ | |
576 | set_pud(pudp, pud); \ | |
577 | }) | |
578 | ||
579 | #define set_p4d_safe(p4dp, p4d) \ | |
580 | ({ \ | |
581 | WARN_ON_ONCE(p4d_present(*p4dp) && !p4d_same(*p4dp, p4d)); \ | |
582 | set_p4d(p4dp, p4d); \ | |
583 | }) | |
584 | ||
585 | #define set_pgd_safe(pgdp, pgd) \ | |
586 | ({ \ | |
587 | WARN_ON_ONCE(pgd_present(*pgdp) && !pgd_same(*pgdp, pgd)); \ | |
588 | set_pgd(pgdp, pgd); \ | |
589 | }) | |
590 | ||
ca827d55 KA |
591 | #ifndef __HAVE_ARCH_DO_SWAP_PAGE |
592 | /* | |
593 | * Some architectures support metadata associated with a page. When a | |
594 | * page is being swapped out, this metadata must be saved so it can be | |
595 | * restored when the page is swapped back in. SPARC M7 and newer | |
596 | * processors support an ADI (Application Data Integrity) tag for the | |
597 | * page as metadata for the page. arch_do_swap_page() can restore this | |
598 | * metadata when a page is swapped back in. | |
599 | */ | |
600 | static inline void arch_do_swap_page(struct mm_struct *mm, | |
601 | struct vm_area_struct *vma, | |
602 | unsigned long addr, | |
603 | pte_t pte, pte_t oldpte) | |
604 | { | |
605 | ||
606 | } | |
607 | #endif | |
608 | ||
609 | #ifndef __HAVE_ARCH_UNMAP_ONE | |
610 | /* | |
611 | * Some architectures support metadata associated with a page. When a | |
612 | * page is being swapped out, this metadata must be saved so it can be | |
613 | * restored when the page is swapped back in. SPARC M7 and newer | |
614 | * processors support an ADI (Application Data Integrity) tag for the | |
615 | * page as metadata for the page. arch_unmap_one() can save this | |
616 | * metadata on a swap-out of a page. | |
617 | */ | |
618 | static inline int arch_unmap_one(struct mm_struct *mm, | |
619 | struct vm_area_struct *vma, | |
620 | unsigned long addr, | |
621 | pte_t orig_pte) | |
622 | { | |
623 | return 0; | |
624 | } | |
625 | #endif | |
626 | ||
1da177e4 LT |
627 | #ifndef __HAVE_ARCH_PGD_OFFSET_GATE |
628 | #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr) | |
629 | #endif | |
630 | ||
0b0968a3 | 631 | #ifndef __HAVE_ARCH_MOVE_PTE |
8b1f3124 | 632 | #define move_pte(pte, prot, old_addr, new_addr) (pte) |
8b1f3124 NP |
633 | #endif |
634 | ||
2c3cf556 | 635 | #ifndef pte_accessible |
20841405 | 636 | # define pte_accessible(mm, pte) ((void)(pte), 1) |
2c3cf556 RR |
637 | #endif |
638 | ||
61c77326 SL |
639 | #ifndef flush_tlb_fix_spurious_fault |
640 | #define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address) | |
641 | #endif | |
642 | ||
cca98e9f CH |
643 | #ifndef pgprot_nx |
644 | #define pgprot_nx(prot) (prot) | |
645 | #endif | |
646 | ||
0634a632 PM |
647 | #ifndef pgprot_noncached |
648 | #define pgprot_noncached(prot) (prot) | |
649 | #endif | |
650 | ||
2520bd31 | 651 | #ifndef pgprot_writecombine |
652 | #define pgprot_writecombine pgprot_noncached | |
653 | #endif | |
654 | ||
d1b4bfbf TK |
655 | #ifndef pgprot_writethrough |
656 | #define pgprot_writethrough pgprot_noncached | |
657 | #endif | |
658 | ||
8b921acf LD |
659 | #ifndef pgprot_device |
660 | #define pgprot_device pgprot_noncached | |
661 | #endif | |
662 | ||
64e45507 PF |
663 | #ifndef pgprot_modify |
664 | #define pgprot_modify pgprot_modify | |
665 | static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) | |
666 | { | |
667 | if (pgprot_val(oldprot) == pgprot_val(pgprot_noncached(oldprot))) | |
668 | newprot = pgprot_noncached(newprot); | |
669 | if (pgprot_val(oldprot) == pgprot_val(pgprot_writecombine(oldprot))) | |
670 | newprot = pgprot_writecombine(newprot); | |
671 | if (pgprot_val(oldprot) == pgprot_val(pgprot_device(oldprot))) | |
672 | newprot = pgprot_device(newprot); | |
673 | return newprot; | |
674 | } | |
675 | #endif | |
676 | ||
1da177e4 | 677 | /* |
8f6c99c1 HD |
678 | * When walking page tables, get the address of the next boundary, |
679 | * or the end address of the range if that comes earlier. Although no | |
680 | * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout. | |
1da177e4 LT |
681 | */ |
682 | ||
1da177e4 LT |
683 | #define pgd_addr_end(addr, end) \ |
684 | ({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \ | |
685 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
686 | }) | |
1da177e4 | 687 | |
c2febafc KS |
688 | #ifndef p4d_addr_end |
689 | #define p4d_addr_end(addr, end) \ | |
690 | ({ unsigned long __boundary = ((addr) + P4D_SIZE) & P4D_MASK; \ | |
691 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
692 | }) | |
693 | #endif | |
694 | ||
1da177e4 LT |
695 | #ifndef pud_addr_end |
696 | #define pud_addr_end(addr, end) \ | |
697 | ({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \ | |
698 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
699 | }) | |
700 | #endif | |
701 | ||
702 | #ifndef pmd_addr_end | |
703 | #define pmd_addr_end(addr, end) \ | |
704 | ({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \ | |
705 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
706 | }) | |
707 | #endif | |
708 | ||
1da177e4 LT |
709 | /* |
710 | * When walking page tables, we usually want to skip any p?d_none entries; | |
711 | * and any p?d_bad entries - reporting the error before resetting to none. | |
712 | * Do the tests inline, but report and clear the bad entry in mm/memory.c. | |
713 | */ | |
714 | void pgd_clear_bad(pgd_t *); | |
f2400abc VG |
715 | |
716 | #ifndef __PAGETABLE_P4D_FOLDED | |
c2febafc | 717 | void p4d_clear_bad(p4d_t *); |
f2400abc VG |
718 | #else |
719 | #define p4d_clear_bad(p4d) do { } while (0) | |
720 | #endif | |
721 | ||
722 | #ifndef __PAGETABLE_PUD_FOLDED | |
1da177e4 | 723 | void pud_clear_bad(pud_t *); |
f2400abc VG |
724 | #else |
725 | #define pud_clear_bad(p4d) do { } while (0) | |
726 | #endif | |
727 | ||
1da177e4 LT |
728 | void pmd_clear_bad(pmd_t *); |
729 | ||
730 | static inline int pgd_none_or_clear_bad(pgd_t *pgd) | |
731 | { | |
732 | if (pgd_none(*pgd)) | |
733 | return 1; | |
734 | if (unlikely(pgd_bad(*pgd))) { | |
735 | pgd_clear_bad(pgd); | |
736 | return 1; | |
737 | } | |
738 | return 0; | |
739 | } | |
740 | ||
c2febafc KS |
741 | static inline int p4d_none_or_clear_bad(p4d_t *p4d) |
742 | { | |
743 | if (p4d_none(*p4d)) | |
744 | return 1; | |
745 | if (unlikely(p4d_bad(*p4d))) { | |
746 | p4d_clear_bad(p4d); | |
747 | return 1; | |
748 | } | |
749 | return 0; | |
750 | } | |
751 | ||
1da177e4 LT |
752 | static inline int pud_none_or_clear_bad(pud_t *pud) |
753 | { | |
754 | if (pud_none(*pud)) | |
755 | return 1; | |
756 | if (unlikely(pud_bad(*pud))) { | |
757 | pud_clear_bad(pud); | |
758 | return 1; | |
759 | } | |
760 | return 0; | |
761 | } | |
762 | ||
763 | static inline int pmd_none_or_clear_bad(pmd_t *pmd) | |
764 | { | |
765 | if (pmd_none(*pmd)) | |
766 | return 1; | |
767 | if (unlikely(pmd_bad(*pmd))) { | |
768 | pmd_clear_bad(pmd); | |
769 | return 1; | |
770 | } | |
771 | return 0; | |
772 | } | |
9535239f | 773 | |
0cbe3e26 | 774 | static inline pte_t __ptep_modify_prot_start(struct vm_area_struct *vma, |
1ea0704e JF |
775 | unsigned long addr, |
776 | pte_t *ptep) | |
777 | { | |
778 | /* | |
779 | * Get the current pte state, but zero it out to make it | |
780 | * non-present, preventing the hardware from asynchronously | |
781 | * updating it. | |
782 | */ | |
0cbe3e26 | 783 | return ptep_get_and_clear(vma->vm_mm, addr, ptep); |
1ea0704e JF |
784 | } |
785 | ||
0cbe3e26 | 786 | static inline void __ptep_modify_prot_commit(struct vm_area_struct *vma, |
1ea0704e JF |
787 | unsigned long addr, |
788 | pte_t *ptep, pte_t pte) | |
789 | { | |
790 | /* | |
791 | * The pte is non-present, so there's no hardware state to | |
792 | * preserve. | |
793 | */ | |
0cbe3e26 | 794 | set_pte_at(vma->vm_mm, addr, ptep, pte); |
1ea0704e JF |
795 | } |
796 | ||
797 | #ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION | |
798 | /* | |
799 | * Start a pte protection read-modify-write transaction, which | |
800 | * protects against asynchronous hardware modifications to the pte. | |
801 | * The intention is not to prevent the hardware from making pte | |
802 | * updates, but to prevent any updates it may make from being lost. | |
803 | * | |
804 | * This does not protect against other software modifications of the | |
805 | * pte; the appropriate pte lock must be held over the transation. | |
806 | * | |
807 | * Note that this interface is intended to be batchable, meaning that | |
808 | * ptep_modify_prot_commit may not actually update the pte, but merely | |
809 | * queue the update to be done at some later time. The update must be | |
810 | * actually committed before the pte lock is released, however. | |
811 | */ | |
0cbe3e26 | 812 | static inline pte_t ptep_modify_prot_start(struct vm_area_struct *vma, |
1ea0704e JF |
813 | unsigned long addr, |
814 | pte_t *ptep) | |
815 | { | |
0cbe3e26 | 816 | return __ptep_modify_prot_start(vma, addr, ptep); |
1ea0704e JF |
817 | } |
818 | ||
819 | /* | |
820 | * Commit an update to a pte, leaving any hardware-controlled bits in | |
821 | * the PTE unmodified. | |
822 | */ | |
0cbe3e26 | 823 | static inline void ptep_modify_prot_commit(struct vm_area_struct *vma, |
1ea0704e | 824 | unsigned long addr, |
04a86453 | 825 | pte_t *ptep, pte_t old_pte, pte_t pte) |
1ea0704e | 826 | { |
0cbe3e26 | 827 | __ptep_modify_prot_commit(vma, addr, ptep, pte); |
1ea0704e JF |
828 | } |
829 | #endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */ | |
fe1a6875 | 830 | #endif /* CONFIG_MMU */ |
1ea0704e | 831 | |
21729f81 TL |
832 | /* |
833 | * No-op macros that just return the current protection value. Defined here | |
834 | * because these macros can be used used even if CONFIG_MMU is not defined. | |
835 | */ | |
836 | #ifndef pgprot_encrypted | |
837 | #define pgprot_encrypted(prot) (prot) | |
838 | #endif | |
839 | ||
840 | #ifndef pgprot_decrypted | |
841 | #define pgprot_decrypted(prot) (prot) | |
842 | #endif | |
843 | ||
9535239f GU |
844 | /* |
845 | * A facility to provide lazy MMU batching. This allows PTE updates and | |
846 | * page invalidations to be delayed until a call to leave lazy MMU mode | |
847 | * is issued. Some architectures may benefit from doing this, and it is | |
848 | * beneficial for both shadow and direct mode hypervisors, which may batch | |
849 | * the PTE updates which happen during this window. Note that using this | |
850 | * interface requires that read hazards be removed from the code. A read | |
851 | * hazard could result in the direct mode hypervisor case, since the actual | |
852 | * write to the page tables may not yet have taken place, so reads though | |
853 | * a raw PTE pointer after it has been modified are not guaranteed to be | |
854 | * up to date. This mode can only be entered and left under the protection of | |
855 | * the page table locks for all page tables which may be modified. In the UP | |
856 | * case, this is required so that preemption is disabled, and in the SMP case, | |
857 | * it must synchronize the delayed page table writes properly on other CPUs. | |
858 | */ | |
859 | #ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE | |
860 | #define arch_enter_lazy_mmu_mode() do {} while (0) | |
861 | #define arch_leave_lazy_mmu_mode() do {} while (0) | |
862 | #define arch_flush_lazy_mmu_mode() do {} while (0) | |
863 | #endif | |
864 | ||
865 | /* | |
7fd7d83d JF |
866 | * A facility to provide batching of the reload of page tables and |
867 | * other process state with the actual context switch code for | |
868 | * paravirtualized guests. By convention, only one of the batched | |
869 | * update (lazy) modes (CPU, MMU) should be active at any given time, | |
870 | * entry should never be nested, and entry and exits should always be | |
871 | * paired. This is for sanity of maintaining and reasoning about the | |
872 | * kernel code. In this case, the exit (end of the context switch) is | |
873 | * in architecture-specific code, and so doesn't need a generic | |
874 | * definition. | |
9535239f | 875 | */ |
7fd7d83d | 876 | #ifndef __HAVE_ARCH_START_CONTEXT_SWITCH |
224101ed | 877 | #define arch_start_context_switch(prev) do {} while (0) |
9535239f GU |
878 | #endif |
879 | ||
ab6e3d09 NH |
880 | #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY |
881 | #ifndef CONFIG_ARCH_ENABLE_THP_MIGRATION | |
882 | static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) | |
883 | { | |
884 | return pmd; | |
885 | } | |
886 | ||
887 | static inline int pmd_swp_soft_dirty(pmd_t pmd) | |
888 | { | |
889 | return 0; | |
890 | } | |
891 | ||
892 | static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) | |
893 | { | |
894 | return pmd; | |
895 | } | |
896 | #endif | |
897 | #else /* !CONFIG_HAVE_ARCH_SOFT_DIRTY */ | |
0f8975ec PE |
898 | static inline int pte_soft_dirty(pte_t pte) |
899 | { | |
900 | return 0; | |
901 | } | |
902 | ||
903 | static inline int pmd_soft_dirty(pmd_t pmd) | |
904 | { | |
905 | return 0; | |
906 | } | |
907 | ||
908 | static inline pte_t pte_mksoft_dirty(pte_t pte) | |
909 | { | |
910 | return pte; | |
911 | } | |
912 | ||
913 | static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) | |
914 | { | |
915 | return pmd; | |
916 | } | |
179ef71c | 917 | |
a7b76174 MS |
918 | static inline pte_t pte_clear_soft_dirty(pte_t pte) |
919 | { | |
920 | return pte; | |
921 | } | |
922 | ||
923 | static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) | |
924 | { | |
925 | return pmd; | |
926 | } | |
927 | ||
179ef71c CG |
928 | static inline pte_t pte_swp_mksoft_dirty(pte_t pte) |
929 | { | |
930 | return pte; | |
931 | } | |
932 | ||
933 | static inline int pte_swp_soft_dirty(pte_t pte) | |
934 | { | |
935 | return 0; | |
936 | } | |
937 | ||
938 | static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) | |
939 | { | |
940 | return pte; | |
941 | } | |
ab6e3d09 NH |
942 | |
943 | static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) | |
944 | { | |
945 | return pmd; | |
946 | } | |
947 | ||
948 | static inline int pmd_swp_soft_dirty(pmd_t pmd) | |
949 | { | |
950 | return 0; | |
951 | } | |
952 | ||
953 | static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) | |
954 | { | |
955 | return pmd; | |
956 | } | |
0f8975ec PE |
957 | #endif |
958 | ||
34801ba9 | 959 | #ifndef __HAVE_PFNMAP_TRACKING |
960 | /* | |
5180da41 SS |
961 | * Interfaces that can be used by architecture code to keep track of |
962 | * memory type of pfn mappings specified by the remap_pfn_range, | |
67fa1666 | 963 | * vmf_insert_pfn. |
5180da41 SS |
964 | */ |
965 | ||
966 | /* | |
967 | * track_pfn_remap is called when a _new_ pfn mapping is being established | |
968 | * by remap_pfn_range() for physical range indicated by pfn and size. | |
34801ba9 | 969 | */ |
5180da41 | 970 | static inline int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, |
b3b9c293 KK |
971 | unsigned long pfn, unsigned long addr, |
972 | unsigned long size) | |
34801ba9 | 973 | { |
974 | return 0; | |
975 | } | |
976 | ||
977 | /* | |
5180da41 | 978 | * track_pfn_insert is called when a _new_ single pfn is established |
67fa1666 | 979 | * by vmf_insert_pfn(). |
5180da41 | 980 | */ |
308a047c BP |
981 | static inline void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, |
982 | pfn_t pfn) | |
5180da41 | 983 | { |
5180da41 SS |
984 | } |
985 | ||
986 | /* | |
987 | * track_pfn_copy is called when vma that is covering the pfnmap gets | |
34801ba9 | 988 | * copied through copy_page_range(). |
989 | */ | |
5180da41 | 990 | static inline int track_pfn_copy(struct vm_area_struct *vma) |
34801ba9 | 991 | { |
992 | return 0; | |
993 | } | |
994 | ||
995 | /* | |
d9fe4fab | 996 | * untrack_pfn is called while unmapping a pfnmap for a region. |
34801ba9 | 997 | * untrack can be called for a specific region indicated by pfn and size or |
5180da41 | 998 | * can be for the entire vma (in which case pfn, size are zero). |
34801ba9 | 999 | */ |
5180da41 SS |
1000 | static inline void untrack_pfn(struct vm_area_struct *vma, |
1001 | unsigned long pfn, unsigned long size) | |
34801ba9 | 1002 | { |
1003 | } | |
d9fe4fab TK |
1004 | |
1005 | /* | |
1006 | * untrack_pfn_moved is called while mremapping a pfnmap for a new region. | |
1007 | */ | |
1008 | static inline void untrack_pfn_moved(struct vm_area_struct *vma) | |
1009 | { | |
1010 | } | |
34801ba9 | 1011 | #else |
5180da41 | 1012 | extern int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, |
b3b9c293 KK |
1013 | unsigned long pfn, unsigned long addr, |
1014 | unsigned long size); | |
308a047c BP |
1015 | extern void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, |
1016 | pfn_t pfn); | |
5180da41 SS |
1017 | extern int track_pfn_copy(struct vm_area_struct *vma); |
1018 | extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, | |
1019 | unsigned long size); | |
d9fe4fab | 1020 | extern void untrack_pfn_moved(struct vm_area_struct *vma); |
34801ba9 | 1021 | #endif |
1022 | ||
816422ad KS |
1023 | #ifdef __HAVE_COLOR_ZERO_PAGE |
1024 | static inline int is_zero_pfn(unsigned long pfn) | |
1025 | { | |
1026 | extern unsigned long zero_pfn; | |
1027 | unsigned long offset_from_zero_pfn = pfn - zero_pfn; | |
1028 | return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT); | |
1029 | } | |
1030 | ||
2f91ec8c KS |
1031 | #define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr)) |
1032 | ||
816422ad KS |
1033 | #else |
1034 | static inline int is_zero_pfn(unsigned long pfn) | |
1035 | { | |
1036 | extern unsigned long zero_pfn; | |
1037 | return pfn == zero_pfn; | |
1038 | } | |
1039 | ||
1040 | static inline unsigned long my_zero_pfn(unsigned long addr) | |
1041 | { | |
1042 | extern unsigned long zero_pfn; | |
1043 | return zero_pfn; | |
1044 | } | |
1045 | #endif | |
1046 | ||
1a5a9906 AA |
1047 | #ifdef CONFIG_MMU |
1048 | ||
5f6e8da7 AA |
1049 | #ifndef CONFIG_TRANSPARENT_HUGEPAGE |
1050 | static inline int pmd_trans_huge(pmd_t pmd) | |
1051 | { | |
1052 | return 0; | |
1053 | } | |
e4e40e02 | 1054 | #ifndef pmd_write |
e2cda322 AA |
1055 | static inline int pmd_write(pmd_t pmd) |
1056 | { | |
1057 | BUG(); | |
1058 | return 0; | |
1059 | } | |
e4e40e02 | 1060 | #endif /* pmd_write */ |
1a5a9906 AA |
1061 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
1062 | ||
1501899a DW |
1063 | #ifndef pud_write |
1064 | static inline int pud_write(pud_t pud) | |
1065 | { | |
1066 | BUG(); | |
1067 | return 0; | |
1068 | } | |
1069 | #endif /* pud_write */ | |
1070 | ||
bf1a12a8 TH |
1071 | #if !defined(CONFIG_ARCH_HAS_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE) |
1072 | static inline int pmd_devmap(pmd_t pmd) | |
1073 | { | |
1074 | return 0; | |
1075 | } | |
1076 | static inline int pud_devmap(pud_t pud) | |
1077 | { | |
1078 | return 0; | |
1079 | } | |
1080 | static inline int pgd_devmap(pgd_t pgd) | |
1081 | { | |
1082 | return 0; | |
1083 | } | |
1084 | #endif | |
1085 | ||
a00cc7d9 MW |
1086 | #if !defined(CONFIG_TRANSPARENT_HUGEPAGE) || \ |
1087 | (defined(CONFIG_TRANSPARENT_HUGEPAGE) && \ | |
1088 | !defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)) | |
1089 | static inline int pud_trans_huge(pud_t pud) | |
1090 | { | |
1091 | return 0; | |
1092 | } | |
1093 | #endif | |
1094 | ||
625110b5 TH |
1095 | /* See pmd_none_or_trans_huge_or_clear_bad for discussion. */ |
1096 | static inline int pud_none_or_trans_huge_or_dev_or_clear_bad(pud_t *pud) | |
1097 | { | |
1098 | pud_t pudval = READ_ONCE(*pud); | |
1099 | ||
1100 | if (pud_none(pudval) || pud_trans_huge(pudval) || pud_devmap(pudval)) | |
1101 | return 1; | |
1102 | if (unlikely(pud_bad(pudval))) { | |
1103 | pud_clear_bad(pud); | |
1104 | return 1; | |
1105 | } | |
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | /* See pmd_trans_unstable for discussion. */ | |
1110 | static inline int pud_trans_unstable(pud_t *pud) | |
1111 | { | |
1112 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \ | |
1113 | defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) | |
1114 | return pud_none_or_trans_huge_or_dev_or_clear_bad(pud); | |
1115 | #else | |
1116 | return 0; | |
1117 | #endif | |
1118 | } | |
1119 | ||
26c19178 AA |
1120 | #ifndef pmd_read_atomic |
1121 | static inline pmd_t pmd_read_atomic(pmd_t *pmdp) | |
1122 | { | |
1123 | /* | |
1124 | * Depend on compiler for an atomic pmd read. NOTE: this is | |
1125 | * only going to work, if the pmdval_t isn't larger than | |
1126 | * an unsigned long. | |
1127 | */ | |
1128 | return *pmdp; | |
1129 | } | |
1130 | #endif | |
1131 | ||
953c66c2 AK |
1132 | #ifndef arch_needs_pgtable_deposit |
1133 | #define arch_needs_pgtable_deposit() (false) | |
1134 | #endif | |
1a5a9906 AA |
1135 | /* |
1136 | * This function is meant to be used by sites walking pagetables with | |
1137 | * the mmap_sem hold in read mode to protect against MADV_DONTNEED and | |
1138 | * transhuge page faults. MADV_DONTNEED can convert a transhuge pmd | |
1139 | * into a null pmd and the transhuge page fault can convert a null pmd | |
1140 | * into an hugepmd or into a regular pmd (if the hugepage allocation | |
1141 | * fails). While holding the mmap_sem in read mode the pmd becomes | |
1142 | * stable and stops changing under us only if it's not null and not a | |
1143 | * transhuge pmd. When those races occurs and this function makes a | |
1144 | * difference vs the standard pmd_none_or_clear_bad, the result is | |
1145 | * undefined so behaving like if the pmd was none is safe (because it | |
1146 | * can return none anyway). The compiler level barrier() is critically | |
1147 | * important to compute the two checks atomically on the same pmdval. | |
26c19178 AA |
1148 | * |
1149 | * For 32bit kernels with a 64bit large pmd_t this automatically takes | |
1150 | * care of reading the pmd atomically to avoid SMP race conditions | |
1151 | * against pmd_populate() when the mmap_sem is hold for reading by the | |
1152 | * caller (a special atomic read not done by "gcc" as in the generic | |
1153 | * version above, is also needed when THP is disabled because the page | |
1154 | * fault can populate the pmd from under us). | |
1a5a9906 AA |
1155 | */ |
1156 | static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd) | |
1157 | { | |
26c19178 | 1158 | pmd_t pmdval = pmd_read_atomic(pmd); |
1a5a9906 AA |
1159 | /* |
1160 | * The barrier will stabilize the pmdval in a register or on | |
1161 | * the stack so that it will stop changing under the code. | |
e4eed03f AA |
1162 | * |
1163 | * When CONFIG_TRANSPARENT_HUGEPAGE=y on x86 32bit PAE, | |
1164 | * pmd_read_atomic is allowed to return a not atomic pmdval | |
1165 | * (for example pointing to an hugepage that has never been | |
1166 | * mapped in the pmd). The below checks will only care about | |
1167 | * the low part of the pmd with 32bit PAE x86 anyway, with the | |
1168 | * exception of pmd_none(). So the important thing is that if | |
1169 | * the low part of the pmd is found null, the high part will | |
1170 | * be also null or the pmd_none() check below would be | |
1171 | * confused. | |
1a5a9906 AA |
1172 | */ |
1173 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
1174 | barrier(); | |
1175 | #endif | |
84c3fc4e ZY |
1176 | /* |
1177 | * !pmd_present() checks for pmd migration entries | |
1178 | * | |
1179 | * The complete check uses is_pmd_migration_entry() in linux/swapops.h | |
1180 | * But using that requires moving current function and pmd_trans_unstable() | |
1181 | * to linux/swapops.h to resovle dependency, which is too much code move. | |
1182 | * | |
1183 | * !pmd_present() is equivalent to is_pmd_migration_entry() currently, | |
1184 | * because !pmd_present() pages can only be under migration not swapped | |
1185 | * out. | |
1186 | * | |
1187 | * pmd_none() is preseved for future condition checks on pmd migration | |
1188 | * entries and not confusing with this function name, although it is | |
1189 | * redundant with !pmd_present(). | |
1190 | */ | |
1191 | if (pmd_none(pmdval) || pmd_trans_huge(pmdval) || | |
1192 | (IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION) && !pmd_present(pmdval))) | |
1a5a9906 AA |
1193 | return 1; |
1194 | if (unlikely(pmd_bad(pmdval))) { | |
ee53664b | 1195 | pmd_clear_bad(pmd); |
1a5a9906 AA |
1196 | return 1; |
1197 | } | |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * This is a noop if Transparent Hugepage Support is not built into | |
1203 | * the kernel. Otherwise it is equivalent to | |
1204 | * pmd_none_or_trans_huge_or_clear_bad(), and shall only be called in | |
1205 | * places that already verified the pmd is not none and they want to | |
1206 | * walk ptes while holding the mmap sem in read mode (write mode don't | |
1207 | * need this). If THP is not enabled, the pmd can't go away under the | |
1208 | * code even if MADV_DONTNEED runs, but if THP is enabled we need to | |
1209 | * run a pmd_trans_unstable before walking the ptes after | |
9ef258ba KW |
1210 | * split_huge_pmd returns (because it may have run when the pmd become |
1211 | * null, but then a page fault can map in a THP and not a regular page). | |
1a5a9906 AA |
1212 | */ |
1213 | static inline int pmd_trans_unstable(pmd_t *pmd) | |
1214 | { | |
1215 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
1216 | return pmd_none_or_trans_huge_or_clear_bad(pmd); | |
1217 | #else | |
1218 | return 0; | |
5f6e8da7 | 1219 | #endif |
1a5a9906 AA |
1220 | } |
1221 | ||
e7bb4b6d MG |
1222 | #ifndef CONFIG_NUMA_BALANCING |
1223 | /* | |
1224 | * Technically a PTE can be PROTNONE even when not doing NUMA balancing but | |
1225 | * the only case the kernel cares is for NUMA balancing and is only ever set | |
1226 | * when the VMA is accessible. For PROT_NONE VMAs, the PTEs are not marked | |
1227 | * _PAGE_PROTNONE so by by default, implement the helper as "always no". It | |
1228 | * is the responsibility of the caller to distinguish between PROT_NONE | |
1229 | * protections and NUMA hinting fault protections. | |
1230 | */ | |
1231 | static inline int pte_protnone(pte_t pte) | |
1232 | { | |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | static inline int pmd_protnone(pmd_t pmd) | |
1237 | { | |
1238 | return 0; | |
1239 | } | |
1240 | #endif /* CONFIG_NUMA_BALANCING */ | |
1241 | ||
1a5a9906 | 1242 | #endif /* CONFIG_MMU */ |
5f6e8da7 | 1243 | |
e61ce6ad | 1244 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP |
c2febafc KS |
1245 | |
1246 | #ifndef __PAGETABLE_P4D_FOLDED | |
1247 | int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot); | |
1248 | int p4d_clear_huge(p4d_t *p4d); | |
1249 | #else | |
1250 | static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot) | |
1251 | { | |
1252 | return 0; | |
1253 | } | |
1254 | static inline int p4d_clear_huge(p4d_t *p4d) | |
1255 | { | |
1256 | return 0; | |
1257 | } | |
1258 | #endif /* !__PAGETABLE_P4D_FOLDED */ | |
1259 | ||
e61ce6ad TK |
1260 | int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot); |
1261 | int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot); | |
b9820d8f TK |
1262 | int pud_clear_huge(pud_t *pud); |
1263 | int pmd_clear_huge(pmd_t *pmd); | |
8e2d4340 | 1264 | int p4d_free_pud_page(p4d_t *p4d, unsigned long addr); |
785a19f9 CP |
1265 | int pud_free_pmd_page(pud_t *pud, unsigned long addr); |
1266 | int pmd_free_pte_page(pmd_t *pmd, unsigned long addr); | |
e61ce6ad | 1267 | #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ |
c2febafc KS |
1268 | static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot) |
1269 | { | |
1270 | return 0; | |
1271 | } | |
e61ce6ad TK |
1272 | static inline int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot) |
1273 | { | |
1274 | return 0; | |
1275 | } | |
1276 | static inline int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot) | |
1277 | { | |
1278 | return 0; | |
1279 | } | |
c2febafc KS |
1280 | static inline int p4d_clear_huge(p4d_t *p4d) |
1281 | { | |
1282 | return 0; | |
1283 | } | |
b9820d8f TK |
1284 | static inline int pud_clear_huge(pud_t *pud) |
1285 | { | |
1286 | return 0; | |
1287 | } | |
1288 | static inline int pmd_clear_huge(pmd_t *pmd) | |
1289 | { | |
1290 | return 0; | |
1291 | } | |
8e2d4340 WD |
1292 | static inline int p4d_free_pud_page(p4d_t *p4d, unsigned long addr) |
1293 | { | |
1294 | return 0; | |
1295 | } | |
785a19f9 | 1296 | static inline int pud_free_pmd_page(pud_t *pud, unsigned long addr) |
b6bdb751 TK |
1297 | { |
1298 | return 0; | |
1299 | } | |
785a19f9 | 1300 | static inline int pmd_free_pte_page(pmd_t *pmd, unsigned long addr) |
b6bdb751 TK |
1301 | { |
1302 | return 0; | |
1303 | } | |
e61ce6ad TK |
1304 | #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ |
1305 | ||
458aa76d AK |
1306 | #ifndef __HAVE_ARCH_FLUSH_PMD_TLB_RANGE |
1307 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
1308 | /* | |
1309 | * ARCHes with special requirements for evicting THP backing TLB entries can | |
1310 | * implement this. Otherwise also, it can help optimize normal TLB flush in | |
1311 | * THP regime. stock flush_tlb_range() typically has optimization to nuke the | |
1312 | * entire TLB TLB if flush span is greater than a threshold, which will | |
1313 | * likely be true for a single huge page. Thus a single thp flush will | |
1314 | * invalidate the entire TLB which is not desitable. | |
1315 | * e.g. see arch/arc: flush_pmd_tlb_range | |
1316 | */ | |
1317 | #define flush_pmd_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end) | |
a00cc7d9 | 1318 | #define flush_pud_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end) |
458aa76d AK |
1319 | #else |
1320 | #define flush_pmd_tlb_range(vma, addr, end) BUILD_BUG() | |
a00cc7d9 | 1321 | #define flush_pud_tlb_range(vma, addr, end) BUILD_BUG() |
458aa76d AK |
1322 | #endif |
1323 | #endif | |
1324 | ||
08ea8c07 BX |
1325 | struct file; |
1326 | int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, | |
1327 | unsigned long size, pgprot_t *vma_prot); | |
613e396b TG |
1328 | |
1329 | #ifndef CONFIG_X86_ESPFIX64 | |
1330 | static inline void init_espfix_bsp(void) { } | |
1331 | #endif | |
1332 | ||
782de70c | 1333 | extern void __init pgtable_cache_init(void); |
caa84136 | 1334 | |
6c26fcd2 JK |
1335 | #ifndef __HAVE_ARCH_PFN_MODIFY_ALLOWED |
1336 | static inline bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot) | |
1337 | { | |
1338 | return true; | |
1339 | } | |
1340 | ||
1341 | static inline bool arch_has_pfn_modify_check(void) | |
1342 | { | |
1343 | return false; | |
1344 | } | |
1345 | #endif /* !_HAVE_ARCH_PFN_MODIFY_ALLOWED */ | |
1346 | ||
a3266bd4 LR |
1347 | /* |
1348 | * Architecture PAGE_KERNEL_* fallbacks | |
1349 | * | |
1350 | * Some architectures don't define certain PAGE_KERNEL_* flags. This is either | |
1351 | * because they really don't support them, or the port needs to be updated to | |
1352 | * reflect the required functionality. Below are a set of relatively safe | |
1353 | * fallbacks, as best effort, which we can count on in lieu of the architectures | |
1354 | * not defining them on their own yet. | |
1355 | */ | |
1356 | ||
1357 | #ifndef PAGE_KERNEL_RO | |
1358 | # define PAGE_KERNEL_RO PAGE_KERNEL | |
1359 | #endif | |
1360 | ||
1a9b4b3d LR |
1361 | #ifndef PAGE_KERNEL_EXEC |
1362 | # define PAGE_KERNEL_EXEC PAGE_KERNEL | |
1363 | #endif | |
1364 | ||
d8626138 JR |
1365 | /* |
1366 | * Page Table Modification bits for pgtbl_mod_mask. | |
1367 | * | |
1368 | * These are used by the p?d_alloc_track*() set of functions an in the generic | |
1369 | * vmalloc/ioremap code to track at which page-table levels entries have been | |
1370 | * modified. Based on that the code can better decide when vmalloc and ioremap | |
1371 | * mapping changes need to be synchronized to other page-tables in the system. | |
1372 | */ | |
1373 | #define __PGTBL_PGD_MODIFIED 0 | |
1374 | #define __PGTBL_P4D_MODIFIED 1 | |
1375 | #define __PGTBL_PUD_MODIFIED 2 | |
1376 | #define __PGTBL_PMD_MODIFIED 3 | |
1377 | #define __PGTBL_PTE_MODIFIED 4 | |
1378 | ||
1379 | #define PGTBL_PGD_MODIFIED BIT(__PGTBL_PGD_MODIFIED) | |
1380 | #define PGTBL_P4D_MODIFIED BIT(__PGTBL_P4D_MODIFIED) | |
1381 | #define PGTBL_PUD_MODIFIED BIT(__PGTBL_PUD_MODIFIED) | |
1382 | #define PGTBL_PMD_MODIFIED BIT(__PGTBL_PMD_MODIFIED) | |
1383 | #define PGTBL_PTE_MODIFIED BIT(__PGTBL_PTE_MODIFIED) | |
1384 | ||
1385 | /* Page-Table Modification Mask */ | |
1386 | typedef unsigned int pgtbl_mod_mask; | |
1387 | ||
1da177e4 LT |
1388 | #endif /* !__ASSEMBLY__ */ |
1389 | ||
40d158e6 AV |
1390 | #ifndef io_remap_pfn_range |
1391 | #define io_remap_pfn_range remap_pfn_range | |
1392 | #endif | |
1393 | ||
fd8cfd30 HD |
1394 | #ifndef has_transparent_hugepage |
1395 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
1396 | #define has_transparent_hugepage() 1 | |
1397 | #else | |
1398 | #define has_transparent_hugepage() 0 | |
1399 | #endif | |
1400 | #endif | |
1401 | ||
1071fc57 MS |
1402 | /* |
1403 | * On some architectures it depends on the mm if the p4d/pud or pmd | |
1404 | * layer of the page table hierarchy is folded or not. | |
1405 | */ | |
1406 | #ifndef mm_p4d_folded | |
1407 | #define mm_p4d_folded(mm) __is_defined(__PAGETABLE_P4D_FOLDED) | |
1408 | #endif | |
1409 | ||
1410 | #ifndef mm_pud_folded | |
1411 | #define mm_pud_folded(mm) __is_defined(__PAGETABLE_PUD_FOLDED) | |
1412 | #endif | |
1413 | ||
1414 | #ifndef mm_pmd_folded | |
1415 | #define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED) | |
1416 | #endif | |
1417 | ||
93fab1b2 SP |
1418 | /* |
1419 | * p?d_leaf() - true if this entry is a final mapping to a physical address. | |
1420 | * This differs from p?d_huge() by the fact that they are always available (if | |
1421 | * the architecture supports large pages at the appropriate level) even | |
1422 | * if CONFIG_HUGETLB_PAGE is not defined. | |
1423 | * Only meaningful when called on a valid entry. | |
1424 | */ | |
1425 | #ifndef pgd_leaf | |
1426 | #define pgd_leaf(x) 0 | |
1427 | #endif | |
1428 | #ifndef p4d_leaf | |
1429 | #define p4d_leaf(x) 0 | |
1430 | #endif | |
1431 | #ifndef pud_leaf | |
1432 | #define pud_leaf(x) 0 | |
1433 | #endif | |
1434 | #ifndef pmd_leaf | |
1435 | #define pmd_leaf(x) 0 | |
1436 | #endif | |
1437 | ||
ca5999fd | 1438 | #endif /* _LINUX_PGTABLE_H */ |