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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 | |
fac7757e AK |
30 | |
31 | /* | |
32 | * This defines the first usable user address. Platforms | |
33 | * can override its value with custom FIRST_USER_ADDRESS | |
34 | * defined in their respective <asm/pgtable.h>. | |
35 | */ | |
36 | #ifndef FIRST_USER_ADDRESS | |
37 | #define FIRST_USER_ADDRESS 0UL | |
38 | #endif | |
1c2f7d14 AK |
39 | |
40 | /* | |
41 | * This defines the generic helper for accessing PMD page | |
42 | * table page. Although platforms can still override this | |
43 | * via their respective <asm/pgtable.h>. | |
44 | */ | |
45 | #ifndef pmd_pgtable | |
46 | #define pmd_pgtable(pmd) pmd_page(pmd) | |
47 | #endif | |
6ee8630e | 48 | |
974b9b2c MR |
49 | /* |
50 | * A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD] | |
51 | * | |
52 | * The pXx_index() functions return the index of the entry in the page | |
53 | * table page which would control the given virtual address | |
54 | * | |
55 | * As these functions may be used by the same code for different levels of | |
56 | * the page table folding, they are always available, regardless of | |
57 | * CONFIG_PGTABLE_LEVELS value. For the folded levels they simply return 0 | |
58 | * because in such cases PTRS_PER_PxD equals 1. | |
59 | */ | |
60 | ||
61 | static inline unsigned long pte_index(unsigned long address) | |
62 | { | |
63 | return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1); | |
64 | } | |
314c459a | 65 | #define pte_index pte_index |
974b9b2c MR |
66 | |
67 | #ifndef pmd_index | |
68 | static inline unsigned long pmd_index(unsigned long address) | |
69 | { | |
70 | return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); | |
71 | } | |
72 | #define pmd_index pmd_index | |
73 | #endif | |
74 | ||
75 | #ifndef pud_index | |
76 | static inline unsigned long pud_index(unsigned long address) | |
77 | { | |
78 | return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1); | |
79 | } | |
80 | #define pud_index pud_index | |
81 | #endif | |
82 | ||
83 | #ifndef pgd_index | |
84 | /* Must be a compile-time constant, so implement it as a macro */ | |
85 | #define pgd_index(a) (((a) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) | |
86 | #endif | |
87 | ||
88 | #ifndef pte_offset_kernel | |
89 | static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address) | |
90 | { | |
91 | return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address); | |
92 | } | |
93 | #define pte_offset_kernel pte_offset_kernel | |
94 | #endif | |
95 | ||
96 | #if defined(CONFIG_HIGHPTE) | |
97 | #define pte_offset_map(dir, address) \ | |
98 | ((pte_t *)kmap_atomic(pmd_page(*(dir))) + \ | |
99 | pte_index((address))) | |
100 | #define pte_unmap(pte) kunmap_atomic((pte)) | |
101 | #else | |
102 | #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address)) | |
103 | #define pte_unmap(pte) ((void)(pte)) /* NOP */ | |
104 | #endif | |
105 | ||
106 | /* Find an entry in the second-level page table.. */ | |
107 | #ifndef pmd_offset | |
108 | static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) | |
109 | { | |
9cf6fa24 | 110 | return pud_pgtable(*pud) + pmd_index(address); |
974b9b2c MR |
111 | } |
112 | #define pmd_offset pmd_offset | |
113 | #endif | |
114 | ||
115 | #ifndef pud_offset | |
116 | static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) | |
117 | { | |
dc4875f0 | 118 | return p4d_pgtable(*p4d) + pud_index(address); |
974b9b2c MR |
119 | } |
120 | #define pud_offset pud_offset | |
121 | #endif | |
122 | ||
123 | static inline pgd_t *pgd_offset_pgd(pgd_t *pgd, unsigned long address) | |
124 | { | |
125 | return (pgd + pgd_index(address)); | |
126 | }; | |
127 | ||
128 | /* | |
129 | * a shortcut to get a pgd_t in a given mm | |
130 | */ | |
131 | #ifndef pgd_offset | |
132 | #define pgd_offset(mm, address) pgd_offset_pgd((mm)->pgd, (address)) | |
133 | #endif | |
134 | ||
135 | /* | |
136 | * a shortcut which implies the use of the kernel's pgd, instead | |
137 | * of a process's | |
138 | */ | |
bd05220c | 139 | #ifndef pgd_offset_k |
974b9b2c | 140 | #define pgd_offset_k(address) pgd_offset(&init_mm, (address)) |
bd05220c | 141 | #endif |
974b9b2c | 142 | |
e05c7b1f MR |
143 | /* |
144 | * In many cases it is known that a virtual address is mapped at PMD or PTE | |
145 | * level, so instead of traversing all the page table levels, we can get a | |
146 | * pointer to the PMD entry in user or kernel page table or translate a virtual | |
147 | * address to the pointer in the PTE in the kernel page tables with simple | |
148 | * helpers. | |
149 | */ | |
150 | static inline pmd_t *pmd_off(struct mm_struct *mm, unsigned long va) | |
151 | { | |
152 | return pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, va), va), va), va); | |
153 | } | |
154 | ||
155 | static inline pmd_t *pmd_off_k(unsigned long va) | |
156 | { | |
157 | return pmd_offset(pud_offset(p4d_offset(pgd_offset_k(va), va), va), va); | |
158 | } | |
159 | ||
160 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
161 | { | |
162 | pmd_t *pmd = pmd_off_k(vaddr); | |
163 | ||
164 | return pmd_none(*pmd) ? NULL : pte_offset_kernel(pmd, vaddr); | |
165 | } | |
166 | ||
1da177e4 | 167 | #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
e2cda322 AA |
168 | extern int ptep_set_access_flags(struct vm_area_struct *vma, |
169 | unsigned long address, pte_t *ptep, | |
170 | pte_t entry, int dirty); | |
171 | #endif | |
172 | ||
173 | #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS | |
bd5e88ad | 174 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e2cda322 AA |
175 | extern int pmdp_set_access_flags(struct vm_area_struct *vma, |
176 | unsigned long address, pmd_t *pmdp, | |
177 | pmd_t entry, int dirty); | |
a00cc7d9 MW |
178 | extern int pudp_set_access_flags(struct vm_area_struct *vma, |
179 | unsigned long address, pud_t *pudp, | |
180 | pud_t entry, int dirty); | |
bd5e88ad VG |
181 | #else |
182 | static inline int pmdp_set_access_flags(struct vm_area_struct *vma, | |
183 | unsigned long address, pmd_t *pmdp, | |
184 | pmd_t entry, int dirty) | |
185 | { | |
186 | BUILD_BUG(); | |
187 | return 0; | |
188 | } | |
a00cc7d9 MW |
189 | static inline int pudp_set_access_flags(struct vm_area_struct *vma, |
190 | unsigned long address, pud_t *pudp, | |
191 | pud_t entry, int dirty) | |
192 | { | |
193 | BUILD_BUG(); | |
194 | return 0; | |
195 | } | |
bd5e88ad | 196 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
1da177e4 LT |
197 | #endif |
198 | ||
199 | #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
e2cda322 AA |
200 | static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, |
201 | unsigned long address, | |
202 | pte_t *ptep) | |
203 | { | |
204 | pte_t pte = *ptep; | |
205 | int r = 1; | |
206 | if (!pte_young(pte)) | |
207 | r = 0; | |
208 | else | |
209 | set_pte_at(vma->vm_mm, address, ptep, pte_mkold(pte)); | |
210 | return r; | |
211 | } | |
212 | #endif | |
213 | ||
214 | #ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG | |
215 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
216 | static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, | |
217 | unsigned long address, | |
218 | pmd_t *pmdp) | |
219 | { | |
220 | pmd_t pmd = *pmdp; | |
221 | int r = 1; | |
222 | if (!pmd_young(pmd)) | |
223 | r = 0; | |
224 | else | |
225 | set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd)); | |
226 | return r; | |
227 | } | |
bd5e88ad | 228 | #else |
e2cda322 AA |
229 | static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, |
230 | unsigned long address, | |
231 | pmd_t *pmdp) | |
232 | { | |
bd5e88ad | 233 | BUILD_BUG(); |
e2cda322 AA |
234 | return 0; |
235 | } | |
236 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1da177e4 LT |
237 | #endif |
238 | ||
239 | #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH | |
e2cda322 AA |
240 | int ptep_clear_flush_young(struct vm_area_struct *vma, |
241 | unsigned long address, pte_t *ptep); | |
242 | #endif | |
243 | ||
244 | #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH | |
bd5e88ad VG |
245 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
246 | extern int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
247 | unsigned long address, pmd_t *pmdp); | |
248 | #else | |
249 | /* | |
250 | * Despite relevant to THP only, this API is called from generic rmap code | |
251 | * under PageTransHuge(), hence needs a dummy implementation for !THP | |
252 | */ | |
253 | static inline int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
254 | unsigned long address, pmd_t *pmdp) | |
255 | { | |
256 | BUILD_BUG(); | |
257 | return 0; | |
258 | } | |
259 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1da177e4 LT |
260 | #endif |
261 | ||
08d5b29e PT |
262 | #ifndef __HAVE_ARCH_PTEP_CLEAR |
263 | static inline void ptep_clear(struct mm_struct *mm, unsigned long addr, | |
264 | pte_t *ptep) | |
265 | { | |
266 | pte_clear(mm, addr, ptep); | |
267 | } | |
268 | #endif | |
269 | ||
1da177e4 | 270 | #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR |
e2cda322 AA |
271 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, |
272 | unsigned long address, | |
273 | pte_t *ptep) | |
274 | { | |
275 | pte_t pte = *ptep; | |
276 | pte_clear(mm, address, ptep); | |
277 | return pte; | |
278 | } | |
279 | #endif | |
280 | ||
481e980a CL |
281 | #ifndef __HAVE_ARCH_PTEP_GET |
282 | static inline pte_t ptep_get(pte_t *ptep) | |
283 | { | |
284 | return READ_ONCE(*ptep); | |
285 | } | |
286 | #endif | |
287 | ||
2a4a06da PZ |
288 | #ifdef CONFIG_GUP_GET_PTE_LOW_HIGH |
289 | /* | |
290 | * WARNING: only to be used in the get_user_pages_fast() implementation. | |
291 | * | |
292 | * With get_user_pages_fast(), we walk down the pagetables without taking any | |
293 | * locks. For this we would like to load the pointers atomically, but sometimes | |
294 | * that is not possible (e.g. without expensive cmpxchg8b on x86_32 PAE). What | |
295 | * we do have is the guarantee that a PTE will only either go from not present | |
296 | * to present, or present to not present or both -- it will not switch to a | |
297 | * completely different present page without a TLB flush in between; something | |
298 | * that we are blocking by holding interrupts off. | |
299 | * | |
300 | * Setting ptes from not present to present goes: | |
301 | * | |
302 | * ptep->pte_high = h; | |
303 | * smp_wmb(); | |
304 | * ptep->pte_low = l; | |
305 | * | |
306 | * And present to not present goes: | |
307 | * | |
308 | * ptep->pte_low = 0; | |
309 | * smp_wmb(); | |
310 | * ptep->pte_high = 0; | |
311 | * | |
312 | * We must ensure here that the load of pte_low sees 'l' IFF pte_high sees 'h'. | |
313 | * We load pte_high *after* loading pte_low, which ensures we don't see an older | |
314 | * value of pte_high. *Then* we recheck pte_low, which ensures that we haven't | |
315 | * picked up a changed pte high. We might have gotten rubbish values from | |
316 | * pte_low and pte_high, but we are guaranteed that pte_low will not have the | |
317 | * present bit set *unless* it is 'l'. Because get_user_pages_fast() only | |
318 | * operates on present ptes we're safe. | |
319 | */ | |
320 | static inline pte_t ptep_get_lockless(pte_t *ptep) | |
321 | { | |
322 | pte_t pte; | |
323 | ||
324 | do { | |
325 | pte.pte_low = ptep->pte_low; | |
326 | smp_rmb(); | |
327 | pte.pte_high = ptep->pte_high; | |
328 | smp_rmb(); | |
329 | } while (unlikely(pte.pte_low != ptep->pte_low)); | |
330 | ||
331 | return pte; | |
332 | } | |
333 | #else /* CONFIG_GUP_GET_PTE_LOW_HIGH */ | |
334 | /* | |
335 | * We require that the PTE can be read atomically. | |
336 | */ | |
337 | static inline pte_t ptep_get_lockless(pte_t *ptep) | |
338 | { | |
339 | return ptep_get(ptep); | |
340 | } | |
341 | #endif /* CONFIG_GUP_GET_PTE_LOW_HIGH */ | |
342 | ||
e2cda322 | 343 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
a00cc7d9 | 344 | #ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR |
8809aa2d AK |
345 | static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, |
346 | unsigned long address, | |
347 | pmd_t *pmdp) | |
e2cda322 AA |
348 | { |
349 | pmd_t pmd = *pmdp; | |
2d28a227 | 350 | pmd_clear(pmdp); |
e2cda322 | 351 | return pmd; |
49b24d6b | 352 | } |
a00cc7d9 MW |
353 | #endif /* __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR */ |
354 | #ifndef __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR | |
355 | static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, | |
356 | unsigned long address, | |
357 | pud_t *pudp) | |
358 | { | |
359 | pud_t pud = *pudp; | |
360 | ||
361 | pud_clear(pudp); | |
362 | return pud; | |
363 | } | |
364 | #endif /* __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR */ | |
e2cda322 | 365 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
1da177e4 | 366 | |
fcbe08d6 | 367 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
a00cc7d9 | 368 | #ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL |
93a98695 | 369 | static inline pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma, |
fcbe08d6 MS |
370 | unsigned long address, pmd_t *pmdp, |
371 | int full) | |
372 | { | |
93a98695 | 373 | return pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); |
fcbe08d6 | 374 | } |
fcbe08d6 MS |
375 | #endif |
376 | ||
a00cc7d9 MW |
377 | #ifndef __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR_FULL |
378 | static inline pud_t pudp_huge_get_and_clear_full(struct mm_struct *mm, | |
379 | unsigned long address, pud_t *pudp, | |
380 | int full) | |
381 | { | |
382 | return pudp_huge_get_and_clear(mm, address, pudp); | |
383 | } | |
384 | #endif | |
385 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
386 | ||
a600388d | 387 | #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL |
e2cda322 AA |
388 | static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, |
389 | unsigned long address, pte_t *ptep, | |
390 | int full) | |
391 | { | |
392 | pte_t pte; | |
393 | pte = ptep_get_and_clear(mm, address, ptep); | |
394 | return pte; | |
395 | } | |
a600388d ZA |
396 | #endif |
397 | ||
7df67697 BM |
398 | |
399 | /* | |
400 | * If two threads concurrently fault at the same page, the thread that | |
401 | * won the race updates the PTE and its local TLB/Cache. The other thread | |
402 | * gives up, simply does nothing, and continues; on architectures where | |
403 | * software can update TLB, local TLB can be updated here to avoid next page | |
404 | * fault. This function updates TLB only, do nothing with cache or others. | |
405 | * It is the difference with function update_mmu_cache. | |
406 | */ | |
407 | #ifndef __HAVE_ARCH_UPDATE_MMU_TLB | |
408 | static inline void update_mmu_tlb(struct vm_area_struct *vma, | |
409 | unsigned long address, pte_t *ptep) | |
410 | { | |
411 | } | |
412 | #define __HAVE_ARCH_UPDATE_MMU_TLB | |
413 | #endif | |
414 | ||
9888a1ca ZA |
415 | /* |
416 | * Some architectures may be able to avoid expensive synchronization | |
417 | * primitives when modifications are made to PTE's which are already | |
418 | * not present, or in the process of an address space destruction. | |
419 | */ | |
420 | #ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL | |
e2cda322 AA |
421 | static inline void pte_clear_not_present_full(struct mm_struct *mm, |
422 | unsigned long address, | |
423 | pte_t *ptep, | |
424 | int full) | |
425 | { | |
426 | pte_clear(mm, address, ptep); | |
427 | } | |
a600388d ZA |
428 | #endif |
429 | ||
1da177e4 | 430 | #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH |
e2cda322 AA |
431 | extern pte_t ptep_clear_flush(struct vm_area_struct *vma, |
432 | unsigned long address, | |
433 | pte_t *ptep); | |
434 | #endif | |
435 | ||
8809aa2d AK |
436 | #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH |
437 | extern pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, | |
e2cda322 AA |
438 | unsigned long address, |
439 | pmd_t *pmdp); | |
a00cc7d9 MW |
440 | extern pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, |
441 | unsigned long address, | |
442 | pud_t *pudp); | |
1da177e4 LT |
443 | #endif |
444 | ||
445 | #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT | |
8c65b4a6 | 446 | struct mm_struct; |
1da177e4 LT |
447 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) |
448 | { | |
449 | pte_t old_pte = *ptep; | |
450 | set_pte_at(mm, address, ptep, pte_wrprotect(old_pte)); | |
451 | } | |
452 | #endif | |
453 | ||
44bf431b BM |
454 | /* |
455 | * On some architectures hardware does not set page access bit when accessing | |
2eb70aab | 456 | * memory page, it is responsibility of software setting this bit. It brings |
44bf431b BM |
457 | * out extra page fault penalty to track page access bit. For optimization page |
458 | * access bit can be set during all page fault flow on these arches. | |
459 | * To be differentiate with macro pte_mkyoung, this macro is used on platforms | |
460 | * where software maintains page access bit. | |
461 | */ | |
50c25ee9 TB |
462 | #ifndef pte_sw_mkyoung |
463 | static inline pte_t pte_sw_mkyoung(pte_t pte) | |
464 | { | |
465 | return pte; | |
466 | } | |
467 | #define pte_sw_mkyoung pte_sw_mkyoung | |
468 | #endif | |
469 | ||
288bc549 AK |
470 | #ifndef pte_savedwrite |
471 | #define pte_savedwrite pte_write | |
472 | #endif | |
473 | ||
474 | #ifndef pte_mk_savedwrite | |
475 | #define pte_mk_savedwrite pte_mkwrite | |
476 | #endif | |
477 | ||
595cd8f2 AK |
478 | #ifndef pte_clear_savedwrite |
479 | #define pte_clear_savedwrite pte_wrprotect | |
480 | #endif | |
481 | ||
288bc549 AK |
482 | #ifndef pmd_savedwrite |
483 | #define pmd_savedwrite pmd_write | |
484 | #endif | |
485 | ||
486 | #ifndef pmd_mk_savedwrite | |
487 | #define pmd_mk_savedwrite pmd_mkwrite | |
488 | #endif | |
489 | ||
595cd8f2 AK |
490 | #ifndef pmd_clear_savedwrite |
491 | #define pmd_clear_savedwrite pmd_wrprotect | |
492 | #endif | |
493 | ||
e2cda322 AA |
494 | #ifndef __HAVE_ARCH_PMDP_SET_WRPROTECT |
495 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
496 | static inline void pmdp_set_wrprotect(struct mm_struct *mm, | |
497 | unsigned long address, pmd_t *pmdp) | |
498 | { | |
499 | pmd_t old_pmd = *pmdp; | |
500 | set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd)); | |
501 | } | |
bd5e88ad | 502 | #else |
e2cda322 AA |
503 | static inline void pmdp_set_wrprotect(struct mm_struct *mm, |
504 | unsigned long address, pmd_t *pmdp) | |
505 | { | |
bd5e88ad | 506 | BUILD_BUG(); |
e2cda322 AA |
507 | } |
508 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
509 | #endif | |
a00cc7d9 MW |
510 | #ifndef __HAVE_ARCH_PUDP_SET_WRPROTECT |
511 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
512 | static inline void pudp_set_wrprotect(struct mm_struct *mm, | |
513 | unsigned long address, pud_t *pudp) | |
514 | { | |
515 | pud_t old_pud = *pudp; | |
516 | ||
517 | set_pud_at(mm, address, pudp, pud_wrprotect(old_pud)); | |
518 | } | |
519 | #else | |
520 | static inline void pudp_set_wrprotect(struct mm_struct *mm, | |
521 | unsigned long address, pud_t *pudp) | |
522 | { | |
523 | BUILD_BUG(); | |
524 | } | |
525 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
526 | #endif | |
e2cda322 | 527 | |
15a25b2e AK |
528 | #ifndef pmdp_collapse_flush |
529 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
f28b6ff8 AK |
530 | extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, |
531 | unsigned long address, pmd_t *pmdp); | |
15a25b2e AK |
532 | #else |
533 | static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, | |
534 | unsigned long address, | |
535 | pmd_t *pmdp) | |
536 | { | |
537 | BUILD_BUG(); | |
538 | return *pmdp; | |
539 | } | |
540 | #define pmdp_collapse_flush pmdp_collapse_flush | |
541 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
542 | #endif | |
543 | ||
e3ebcf64 | 544 | #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT |
6b0b50b0 AK |
545 | extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, |
546 | pgtable_t pgtable); | |
e3ebcf64 GS |
547 | #endif |
548 | ||
549 | #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW | |
6b0b50b0 | 550 | extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); |
e3ebcf64 GS |
551 | #endif |
552 | ||
c58f0bb7 KS |
553 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
554 | /* | |
555 | * This is an implementation of pmdp_establish() that is only suitable for an | |
556 | * architecture that doesn't have hardware dirty/accessed bits. In this case we | |
2eb70aab | 557 | * can't race with CPU which sets these bits and non-atomic approach is fine. |
c58f0bb7 KS |
558 | */ |
559 | static inline pmd_t generic_pmdp_establish(struct vm_area_struct *vma, | |
560 | unsigned long address, pmd_t *pmdp, pmd_t pmd) | |
561 | { | |
562 | pmd_t old_pmd = *pmdp; | |
563 | set_pmd_at(vma->vm_mm, address, pmdp, pmd); | |
564 | return old_pmd; | |
565 | } | |
566 | #endif | |
567 | ||
46dcde73 | 568 | #ifndef __HAVE_ARCH_PMDP_INVALIDATE |
d52605d7 | 569 | extern pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, |
46dcde73 GS |
570 | pmd_t *pmdp); |
571 | #endif | |
572 | ||
1da177e4 | 573 | #ifndef __HAVE_ARCH_PTE_SAME |
e2cda322 AA |
574 | static inline int pte_same(pte_t pte_a, pte_t pte_b) |
575 | { | |
576 | return pte_val(pte_a) == pte_val(pte_b); | |
577 | } | |
578 | #endif | |
579 | ||
45961722 KW |
580 | #ifndef __HAVE_ARCH_PTE_UNUSED |
581 | /* | |
582 | * Some architectures provide facilities to virtualization guests | |
583 | * so that they can flag allocated pages as unused. This allows the | |
584 | * host to transparently reclaim unused pages. This function returns | |
585 | * whether the pte's page is unused. | |
586 | */ | |
587 | static inline int pte_unused(pte_t pte) | |
588 | { | |
589 | return 0; | |
590 | } | |
591 | #endif | |
592 | ||
e7884f8e KS |
593 | #ifndef pte_access_permitted |
594 | #define pte_access_permitted(pte, write) \ | |
595 | (pte_present(pte) && (!(write) || pte_write(pte))) | |
596 | #endif | |
597 | ||
598 | #ifndef pmd_access_permitted | |
599 | #define pmd_access_permitted(pmd, write) \ | |
600 | (pmd_present(pmd) && (!(write) || pmd_write(pmd))) | |
601 | #endif | |
602 | ||
603 | #ifndef pud_access_permitted | |
604 | #define pud_access_permitted(pud, write) \ | |
605 | (pud_present(pud) && (!(write) || pud_write(pud))) | |
606 | #endif | |
607 | ||
608 | #ifndef p4d_access_permitted | |
609 | #define p4d_access_permitted(p4d, write) \ | |
610 | (p4d_present(p4d) && (!(write) || p4d_write(p4d))) | |
611 | #endif | |
612 | ||
613 | #ifndef pgd_access_permitted | |
614 | #define pgd_access_permitted(pgd, write) \ | |
615 | (pgd_present(pgd) && (!(write) || pgd_write(pgd))) | |
616 | #endif | |
617 | ||
e2cda322 | 618 | #ifndef __HAVE_ARCH_PMD_SAME |
e2cda322 AA |
619 | static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) |
620 | { | |
621 | return pmd_val(pmd_a) == pmd_val(pmd_b); | |
622 | } | |
a00cc7d9 MW |
623 | |
624 | static inline int pud_same(pud_t pud_a, pud_t pud_b) | |
625 | { | |
626 | return pud_val(pud_a) == pud_val(pud_b); | |
627 | } | |
1da177e4 LT |
628 | #endif |
629 | ||
0cebbb60 DW |
630 | #ifndef __HAVE_ARCH_P4D_SAME |
631 | static inline int p4d_same(p4d_t p4d_a, p4d_t p4d_b) | |
632 | { | |
633 | return p4d_val(p4d_a) == p4d_val(p4d_b); | |
634 | } | |
635 | #endif | |
636 | ||
637 | #ifndef __HAVE_ARCH_PGD_SAME | |
638 | static inline int pgd_same(pgd_t pgd_a, pgd_t pgd_b) | |
639 | { | |
640 | return pgd_val(pgd_a) == pgd_val(pgd_b); | |
641 | } | |
642 | #endif | |
643 | ||
4369deaa DW |
644 | /* |
645 | * Use set_p*_safe(), and elide TLB flushing, when confident that *no* | |
646 | * TLB flush will be required as a result of the "set". For example, use | |
647 | * in scenarios where it is known ahead of time that the routine is | |
648 | * setting non-present entries, or re-setting an existing entry to the | |
649 | * same value. Otherwise, use the typical "set" helpers and flush the | |
650 | * TLB. | |
651 | */ | |
652 | #define set_pte_safe(ptep, pte) \ | |
653 | ({ \ | |
654 | WARN_ON_ONCE(pte_present(*ptep) && !pte_same(*ptep, pte)); \ | |
655 | set_pte(ptep, pte); \ | |
656 | }) | |
657 | ||
658 | #define set_pmd_safe(pmdp, pmd) \ | |
659 | ({ \ | |
660 | WARN_ON_ONCE(pmd_present(*pmdp) && !pmd_same(*pmdp, pmd)); \ | |
661 | set_pmd(pmdp, pmd); \ | |
662 | }) | |
663 | ||
664 | #define set_pud_safe(pudp, pud) \ | |
665 | ({ \ | |
666 | WARN_ON_ONCE(pud_present(*pudp) && !pud_same(*pudp, pud)); \ | |
667 | set_pud(pudp, pud); \ | |
668 | }) | |
669 | ||
670 | #define set_p4d_safe(p4dp, p4d) \ | |
671 | ({ \ | |
672 | WARN_ON_ONCE(p4d_present(*p4dp) && !p4d_same(*p4dp, p4d)); \ | |
673 | set_p4d(p4dp, p4d); \ | |
674 | }) | |
675 | ||
676 | #define set_pgd_safe(pgdp, pgd) \ | |
677 | ({ \ | |
678 | WARN_ON_ONCE(pgd_present(*pgdp) && !pgd_same(*pgdp, pgd)); \ | |
679 | set_pgd(pgdp, pgd); \ | |
680 | }) | |
681 | ||
ca827d55 KA |
682 | #ifndef __HAVE_ARCH_DO_SWAP_PAGE |
683 | /* | |
684 | * Some architectures support metadata associated with a page. When a | |
685 | * page is being swapped out, this metadata must be saved so it can be | |
686 | * restored when the page is swapped back in. SPARC M7 and newer | |
687 | * processors support an ADI (Application Data Integrity) tag for the | |
688 | * page as metadata for the page. arch_do_swap_page() can restore this | |
689 | * metadata when a page is swapped back in. | |
690 | */ | |
691 | static inline void arch_do_swap_page(struct mm_struct *mm, | |
692 | struct vm_area_struct *vma, | |
693 | unsigned long addr, | |
694 | pte_t pte, pte_t oldpte) | |
695 | { | |
696 | ||
697 | } | |
698 | #endif | |
699 | ||
700 | #ifndef __HAVE_ARCH_UNMAP_ONE | |
701 | /* | |
702 | * Some architectures support metadata associated with a page. When a | |
703 | * page is being swapped out, this metadata must be saved so it can be | |
704 | * restored when the page is swapped back in. SPARC M7 and newer | |
705 | * processors support an ADI (Application Data Integrity) tag for the | |
706 | * page as metadata for the page. arch_unmap_one() can save this | |
707 | * metadata on a swap-out of a page. | |
708 | */ | |
709 | static inline int arch_unmap_one(struct mm_struct *mm, | |
710 | struct vm_area_struct *vma, | |
711 | unsigned long addr, | |
712 | pte_t orig_pte) | |
713 | { | |
714 | return 0; | |
715 | } | |
716 | #endif | |
717 | ||
8a84802e SP |
718 | /* |
719 | * Allow architectures to preserve additional metadata associated with | |
720 | * swapped-out pages. The corresponding __HAVE_ARCH_SWAP_* macros and function | |
721 | * prototypes must be defined in the arch-specific asm/pgtable.h file. | |
722 | */ | |
723 | #ifndef __HAVE_ARCH_PREPARE_TO_SWAP | |
724 | static inline int arch_prepare_to_swap(struct page *page) | |
725 | { | |
726 | return 0; | |
727 | } | |
728 | #endif | |
729 | ||
730 | #ifndef __HAVE_ARCH_SWAP_INVALIDATE | |
731 | static inline void arch_swap_invalidate_page(int type, pgoff_t offset) | |
732 | { | |
733 | } | |
734 | ||
735 | static inline void arch_swap_invalidate_area(int type) | |
736 | { | |
737 | } | |
738 | #endif | |
739 | ||
740 | #ifndef __HAVE_ARCH_SWAP_RESTORE | |
741 | static inline void arch_swap_restore(swp_entry_t entry, struct page *page) | |
742 | { | |
743 | } | |
744 | #endif | |
745 | ||
1da177e4 LT |
746 | #ifndef __HAVE_ARCH_PGD_OFFSET_GATE |
747 | #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr) | |
748 | #endif | |
749 | ||
0b0968a3 | 750 | #ifndef __HAVE_ARCH_MOVE_PTE |
8b1f3124 | 751 | #define move_pte(pte, prot, old_addr, new_addr) (pte) |
8b1f3124 NP |
752 | #endif |
753 | ||
2c3cf556 | 754 | #ifndef pte_accessible |
20841405 | 755 | # define pte_accessible(mm, pte) ((void)(pte), 1) |
2c3cf556 RR |
756 | #endif |
757 | ||
61c77326 SL |
758 | #ifndef flush_tlb_fix_spurious_fault |
759 | #define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address) | |
760 | #endif | |
761 | ||
1da177e4 | 762 | /* |
8f6c99c1 HD |
763 | * When walking page tables, get the address of the next boundary, |
764 | * or the end address of the range if that comes earlier. Although no | |
765 | * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout. | |
1da177e4 LT |
766 | */ |
767 | ||
1da177e4 LT |
768 | #define pgd_addr_end(addr, end) \ |
769 | ({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \ | |
770 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
771 | }) | |
1da177e4 | 772 | |
c2febafc KS |
773 | #ifndef p4d_addr_end |
774 | #define p4d_addr_end(addr, end) \ | |
775 | ({ unsigned long __boundary = ((addr) + P4D_SIZE) & P4D_MASK; \ | |
776 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
777 | }) | |
778 | #endif | |
779 | ||
1da177e4 LT |
780 | #ifndef pud_addr_end |
781 | #define pud_addr_end(addr, end) \ | |
782 | ({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \ | |
783 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
784 | }) | |
785 | #endif | |
786 | ||
787 | #ifndef pmd_addr_end | |
788 | #define pmd_addr_end(addr, end) \ | |
789 | ({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \ | |
790 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
791 | }) | |
792 | #endif | |
793 | ||
1da177e4 LT |
794 | /* |
795 | * When walking page tables, we usually want to skip any p?d_none entries; | |
796 | * and any p?d_bad entries - reporting the error before resetting to none. | |
797 | * Do the tests inline, but report and clear the bad entry in mm/memory.c. | |
798 | */ | |
799 | void pgd_clear_bad(pgd_t *); | |
f2400abc VG |
800 | |
801 | #ifndef __PAGETABLE_P4D_FOLDED | |
c2febafc | 802 | void p4d_clear_bad(p4d_t *); |
f2400abc VG |
803 | #else |
804 | #define p4d_clear_bad(p4d) do { } while (0) | |
805 | #endif | |
806 | ||
807 | #ifndef __PAGETABLE_PUD_FOLDED | |
1da177e4 | 808 | void pud_clear_bad(pud_t *); |
f2400abc VG |
809 | #else |
810 | #define pud_clear_bad(p4d) do { } while (0) | |
811 | #endif | |
812 | ||
1da177e4 LT |
813 | void pmd_clear_bad(pmd_t *); |
814 | ||
815 | static inline int pgd_none_or_clear_bad(pgd_t *pgd) | |
816 | { | |
817 | if (pgd_none(*pgd)) | |
818 | return 1; | |
819 | if (unlikely(pgd_bad(*pgd))) { | |
820 | pgd_clear_bad(pgd); | |
821 | return 1; | |
822 | } | |
823 | return 0; | |
824 | } | |
825 | ||
c2febafc KS |
826 | static inline int p4d_none_or_clear_bad(p4d_t *p4d) |
827 | { | |
828 | if (p4d_none(*p4d)) | |
829 | return 1; | |
830 | if (unlikely(p4d_bad(*p4d))) { | |
831 | p4d_clear_bad(p4d); | |
832 | return 1; | |
833 | } | |
834 | return 0; | |
835 | } | |
836 | ||
1da177e4 LT |
837 | static inline int pud_none_or_clear_bad(pud_t *pud) |
838 | { | |
839 | if (pud_none(*pud)) | |
840 | return 1; | |
841 | if (unlikely(pud_bad(*pud))) { | |
842 | pud_clear_bad(pud); | |
843 | return 1; | |
844 | } | |
845 | return 0; | |
846 | } | |
847 | ||
848 | static inline int pmd_none_or_clear_bad(pmd_t *pmd) | |
849 | { | |
850 | if (pmd_none(*pmd)) | |
851 | return 1; | |
852 | if (unlikely(pmd_bad(*pmd))) { | |
853 | pmd_clear_bad(pmd); | |
854 | return 1; | |
855 | } | |
856 | return 0; | |
857 | } | |
9535239f | 858 | |
0cbe3e26 | 859 | static inline pte_t __ptep_modify_prot_start(struct vm_area_struct *vma, |
1ea0704e JF |
860 | unsigned long addr, |
861 | pte_t *ptep) | |
862 | { | |
863 | /* | |
864 | * Get the current pte state, but zero it out to make it | |
865 | * non-present, preventing the hardware from asynchronously | |
866 | * updating it. | |
867 | */ | |
0cbe3e26 | 868 | return ptep_get_and_clear(vma->vm_mm, addr, ptep); |
1ea0704e JF |
869 | } |
870 | ||
0cbe3e26 | 871 | static inline void __ptep_modify_prot_commit(struct vm_area_struct *vma, |
1ea0704e JF |
872 | unsigned long addr, |
873 | pte_t *ptep, pte_t pte) | |
874 | { | |
875 | /* | |
876 | * The pte is non-present, so there's no hardware state to | |
877 | * preserve. | |
878 | */ | |
0cbe3e26 | 879 | set_pte_at(vma->vm_mm, addr, ptep, pte); |
1ea0704e JF |
880 | } |
881 | ||
882 | #ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION | |
883 | /* | |
884 | * Start a pte protection read-modify-write transaction, which | |
885 | * protects against asynchronous hardware modifications to the pte. | |
886 | * The intention is not to prevent the hardware from making pte | |
887 | * updates, but to prevent any updates it may make from being lost. | |
888 | * | |
889 | * This does not protect against other software modifications of the | |
2eb70aab | 890 | * pte; the appropriate pte lock must be held over the transaction. |
1ea0704e JF |
891 | * |
892 | * Note that this interface is intended to be batchable, meaning that | |
893 | * ptep_modify_prot_commit may not actually update the pte, but merely | |
894 | * queue the update to be done at some later time. The update must be | |
895 | * actually committed before the pte lock is released, however. | |
896 | */ | |
0cbe3e26 | 897 | static inline pte_t ptep_modify_prot_start(struct vm_area_struct *vma, |
1ea0704e JF |
898 | unsigned long addr, |
899 | pte_t *ptep) | |
900 | { | |
0cbe3e26 | 901 | return __ptep_modify_prot_start(vma, addr, ptep); |
1ea0704e JF |
902 | } |
903 | ||
904 | /* | |
905 | * Commit an update to a pte, leaving any hardware-controlled bits in | |
906 | * the PTE unmodified. | |
907 | */ | |
0cbe3e26 | 908 | static inline void ptep_modify_prot_commit(struct vm_area_struct *vma, |
1ea0704e | 909 | unsigned long addr, |
04a86453 | 910 | pte_t *ptep, pte_t old_pte, pte_t pte) |
1ea0704e | 911 | { |
0cbe3e26 | 912 | __ptep_modify_prot_commit(vma, addr, ptep, pte); |
1ea0704e JF |
913 | } |
914 | #endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */ | |
fe1a6875 | 915 | #endif /* CONFIG_MMU */ |
1ea0704e | 916 | |
21729f81 TL |
917 | /* |
918 | * No-op macros that just return the current protection value. Defined here | |
1067b261 | 919 | * because these macros can be used even if CONFIG_MMU is not defined. |
21729f81 | 920 | */ |
63bb76de PE |
921 | |
922 | #ifndef pgprot_nx | |
923 | #define pgprot_nx(prot) (prot) | |
924 | #endif | |
925 | ||
926 | #ifndef pgprot_noncached | |
927 | #define pgprot_noncached(prot) (prot) | |
928 | #endif | |
929 | ||
930 | #ifndef pgprot_writecombine | |
931 | #define pgprot_writecombine pgprot_noncached | |
932 | #endif | |
933 | ||
934 | #ifndef pgprot_writethrough | |
935 | #define pgprot_writethrough pgprot_noncached | |
936 | #endif | |
937 | ||
938 | #ifndef pgprot_device | |
939 | #define pgprot_device pgprot_noncached | |
940 | #endif | |
941 | ||
d15dfd31 CM |
942 | #ifndef pgprot_mhp |
943 | #define pgprot_mhp(prot) (prot) | |
944 | #endif | |
945 | ||
63bb76de PE |
946 | #ifdef CONFIG_MMU |
947 | #ifndef pgprot_modify | |
948 | #define pgprot_modify pgprot_modify | |
949 | static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) | |
950 | { | |
951 | if (pgprot_val(oldprot) == pgprot_val(pgprot_noncached(oldprot))) | |
952 | newprot = pgprot_noncached(newprot); | |
953 | if (pgprot_val(oldprot) == pgprot_val(pgprot_writecombine(oldprot))) | |
954 | newprot = pgprot_writecombine(newprot); | |
955 | if (pgprot_val(oldprot) == pgprot_val(pgprot_device(oldprot))) | |
956 | newprot = pgprot_device(newprot); | |
957 | return newprot; | |
958 | } | |
959 | #endif | |
960 | #endif /* CONFIG_MMU */ | |
961 | ||
21729f81 TL |
962 | #ifndef pgprot_encrypted |
963 | #define pgprot_encrypted(prot) (prot) | |
964 | #endif | |
965 | ||
966 | #ifndef pgprot_decrypted | |
967 | #define pgprot_decrypted(prot) (prot) | |
968 | #endif | |
969 | ||
9535239f GU |
970 | /* |
971 | * A facility to provide lazy MMU batching. This allows PTE updates and | |
972 | * page invalidations to be delayed until a call to leave lazy MMU mode | |
973 | * is issued. Some architectures may benefit from doing this, and it is | |
974 | * beneficial for both shadow and direct mode hypervisors, which may batch | |
975 | * the PTE updates which happen during this window. Note that using this | |
976 | * interface requires that read hazards be removed from the code. A read | |
977 | * hazard could result in the direct mode hypervisor case, since the actual | |
978 | * write to the page tables may not yet have taken place, so reads though | |
979 | * a raw PTE pointer after it has been modified are not guaranteed to be | |
980 | * up to date. This mode can only be entered and left under the protection of | |
981 | * the page table locks for all page tables which may be modified. In the UP | |
982 | * case, this is required so that preemption is disabled, and in the SMP case, | |
983 | * it must synchronize the delayed page table writes properly on other CPUs. | |
984 | */ | |
985 | #ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE | |
986 | #define arch_enter_lazy_mmu_mode() do {} while (0) | |
987 | #define arch_leave_lazy_mmu_mode() do {} while (0) | |
988 | #define arch_flush_lazy_mmu_mode() do {} while (0) | |
989 | #endif | |
990 | ||
991 | /* | |
7fd7d83d JF |
992 | * A facility to provide batching of the reload of page tables and |
993 | * other process state with the actual context switch code for | |
994 | * paravirtualized guests. By convention, only one of the batched | |
995 | * update (lazy) modes (CPU, MMU) should be active at any given time, | |
996 | * entry should never be nested, and entry and exits should always be | |
997 | * paired. This is for sanity of maintaining and reasoning about the | |
998 | * kernel code. In this case, the exit (end of the context switch) is | |
999 | * in architecture-specific code, and so doesn't need a generic | |
1000 | * definition. | |
9535239f | 1001 | */ |
7fd7d83d | 1002 | #ifndef __HAVE_ARCH_START_CONTEXT_SWITCH |
224101ed | 1003 | #define arch_start_context_switch(prev) do {} while (0) |
9535239f GU |
1004 | #endif |
1005 | ||
ab6e3d09 NH |
1006 | #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY |
1007 | #ifndef CONFIG_ARCH_ENABLE_THP_MIGRATION | |
1008 | static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) | |
1009 | { | |
1010 | return pmd; | |
1011 | } | |
1012 | ||
1013 | static inline int pmd_swp_soft_dirty(pmd_t pmd) | |
1014 | { | |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) | |
1019 | { | |
1020 | return pmd; | |
1021 | } | |
1022 | #endif | |
1023 | #else /* !CONFIG_HAVE_ARCH_SOFT_DIRTY */ | |
0f8975ec PE |
1024 | static inline int pte_soft_dirty(pte_t pte) |
1025 | { | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | static inline int pmd_soft_dirty(pmd_t pmd) | |
1030 | { | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | static inline pte_t pte_mksoft_dirty(pte_t pte) | |
1035 | { | |
1036 | return pte; | |
1037 | } | |
1038 | ||
1039 | static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) | |
1040 | { | |
1041 | return pmd; | |
1042 | } | |
179ef71c | 1043 | |
a7b76174 MS |
1044 | static inline pte_t pte_clear_soft_dirty(pte_t pte) |
1045 | { | |
1046 | return pte; | |
1047 | } | |
1048 | ||
1049 | static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) | |
1050 | { | |
1051 | return pmd; | |
1052 | } | |
1053 | ||
179ef71c CG |
1054 | static inline pte_t pte_swp_mksoft_dirty(pte_t pte) |
1055 | { | |
1056 | return pte; | |
1057 | } | |
1058 | ||
1059 | static inline int pte_swp_soft_dirty(pte_t pte) | |
1060 | { | |
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) | |
1065 | { | |
1066 | return pte; | |
1067 | } | |
ab6e3d09 NH |
1068 | |
1069 | static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) | |
1070 | { | |
1071 | return pmd; | |
1072 | } | |
1073 | ||
1074 | static inline int pmd_swp_soft_dirty(pmd_t pmd) | |
1075 | { | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd) | |
1080 | { | |
1081 | return pmd; | |
1082 | } | |
0f8975ec PE |
1083 | #endif |
1084 | ||
34801ba9 | 1085 | #ifndef __HAVE_PFNMAP_TRACKING |
1086 | /* | |
5180da41 SS |
1087 | * Interfaces that can be used by architecture code to keep track of |
1088 | * memory type of pfn mappings specified by the remap_pfn_range, | |
67fa1666 | 1089 | * vmf_insert_pfn. |
5180da41 SS |
1090 | */ |
1091 | ||
1092 | /* | |
1093 | * track_pfn_remap is called when a _new_ pfn mapping is being established | |
1094 | * by remap_pfn_range() for physical range indicated by pfn and size. | |
34801ba9 | 1095 | */ |
5180da41 | 1096 | static inline int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, |
b3b9c293 KK |
1097 | unsigned long pfn, unsigned long addr, |
1098 | unsigned long size) | |
34801ba9 | 1099 | { |
1100 | return 0; | |
1101 | } | |
1102 | ||
1103 | /* | |
5180da41 | 1104 | * track_pfn_insert is called when a _new_ single pfn is established |
67fa1666 | 1105 | * by vmf_insert_pfn(). |
5180da41 | 1106 | */ |
308a047c BP |
1107 | static inline void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, |
1108 | pfn_t pfn) | |
5180da41 | 1109 | { |
5180da41 SS |
1110 | } |
1111 | ||
1112 | /* | |
1113 | * track_pfn_copy is called when vma that is covering the pfnmap gets | |
34801ba9 | 1114 | * copied through copy_page_range(). |
1115 | */ | |
5180da41 | 1116 | static inline int track_pfn_copy(struct vm_area_struct *vma) |
34801ba9 | 1117 | { |
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | /* | |
d9fe4fab | 1122 | * untrack_pfn is called while unmapping a pfnmap for a region. |
34801ba9 | 1123 | * untrack can be called for a specific region indicated by pfn and size or |
5180da41 | 1124 | * can be for the entire vma (in which case pfn, size are zero). |
34801ba9 | 1125 | */ |
5180da41 SS |
1126 | static inline void untrack_pfn(struct vm_area_struct *vma, |
1127 | unsigned long pfn, unsigned long size) | |
34801ba9 | 1128 | { |
1129 | } | |
d9fe4fab TK |
1130 | |
1131 | /* | |
1132 | * untrack_pfn_moved is called while mremapping a pfnmap for a new region. | |
1133 | */ | |
1134 | static inline void untrack_pfn_moved(struct vm_area_struct *vma) | |
1135 | { | |
1136 | } | |
34801ba9 | 1137 | #else |
5180da41 | 1138 | extern int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, |
b3b9c293 KK |
1139 | unsigned long pfn, unsigned long addr, |
1140 | unsigned long size); | |
308a047c BP |
1141 | extern void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, |
1142 | pfn_t pfn); | |
5180da41 SS |
1143 | extern int track_pfn_copy(struct vm_area_struct *vma); |
1144 | extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, | |
1145 | unsigned long size); | |
d9fe4fab | 1146 | extern void untrack_pfn_moved(struct vm_area_struct *vma); |
34801ba9 | 1147 | #endif |
1148 | ||
9afaf30f | 1149 | #ifdef CONFIG_MMU |
816422ad KS |
1150 | #ifdef __HAVE_COLOR_ZERO_PAGE |
1151 | static inline int is_zero_pfn(unsigned long pfn) | |
1152 | { | |
1153 | extern unsigned long zero_pfn; | |
1154 | unsigned long offset_from_zero_pfn = pfn - zero_pfn; | |
1155 | return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT); | |
1156 | } | |
1157 | ||
2f91ec8c KS |
1158 | #define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr)) |
1159 | ||
816422ad KS |
1160 | #else |
1161 | static inline int is_zero_pfn(unsigned long pfn) | |
1162 | { | |
1163 | extern unsigned long zero_pfn; | |
1164 | return pfn == zero_pfn; | |
1165 | } | |
1166 | ||
1167 | static inline unsigned long my_zero_pfn(unsigned long addr) | |
1168 | { | |
1169 | extern unsigned long zero_pfn; | |
1170 | return zero_pfn; | |
1171 | } | |
1172 | #endif | |
9afaf30f PT |
1173 | #else |
1174 | static inline int is_zero_pfn(unsigned long pfn) | |
1175 | { | |
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | static inline unsigned long my_zero_pfn(unsigned long addr) | |
1180 | { | |
1181 | return 0; | |
1182 | } | |
1183 | #endif /* CONFIG_MMU */ | |
816422ad | 1184 | |
1a5a9906 AA |
1185 | #ifdef CONFIG_MMU |
1186 | ||
5f6e8da7 AA |
1187 | #ifndef CONFIG_TRANSPARENT_HUGEPAGE |
1188 | static inline int pmd_trans_huge(pmd_t pmd) | |
1189 | { | |
1190 | return 0; | |
1191 | } | |
e4e40e02 | 1192 | #ifndef pmd_write |
e2cda322 AA |
1193 | static inline int pmd_write(pmd_t pmd) |
1194 | { | |
1195 | BUG(); | |
1196 | return 0; | |
1197 | } | |
e4e40e02 | 1198 | #endif /* pmd_write */ |
1a5a9906 AA |
1199 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
1200 | ||
1501899a DW |
1201 | #ifndef pud_write |
1202 | static inline int pud_write(pud_t pud) | |
1203 | { | |
1204 | BUG(); | |
1205 | return 0; | |
1206 | } | |
1207 | #endif /* pud_write */ | |
1208 | ||
bf1a12a8 TH |
1209 | #if !defined(CONFIG_ARCH_HAS_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE) |
1210 | static inline int pmd_devmap(pmd_t pmd) | |
1211 | { | |
1212 | return 0; | |
1213 | } | |
1214 | static inline int pud_devmap(pud_t pud) | |
1215 | { | |
1216 | return 0; | |
1217 | } | |
1218 | static inline int pgd_devmap(pgd_t pgd) | |
1219 | { | |
1220 | return 0; | |
1221 | } | |
1222 | #endif | |
1223 | ||
a00cc7d9 MW |
1224 | #if !defined(CONFIG_TRANSPARENT_HUGEPAGE) || \ |
1225 | (defined(CONFIG_TRANSPARENT_HUGEPAGE) && \ | |
1226 | !defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)) | |
1227 | static inline int pud_trans_huge(pud_t pud) | |
1228 | { | |
1229 | return 0; | |
1230 | } | |
1231 | #endif | |
1232 | ||
625110b5 TH |
1233 | /* See pmd_none_or_trans_huge_or_clear_bad for discussion. */ |
1234 | static inline int pud_none_or_trans_huge_or_dev_or_clear_bad(pud_t *pud) | |
1235 | { | |
1236 | pud_t pudval = READ_ONCE(*pud); | |
1237 | ||
1238 | if (pud_none(pudval) || pud_trans_huge(pudval) || pud_devmap(pudval)) | |
1239 | return 1; | |
1240 | if (unlikely(pud_bad(pudval))) { | |
1241 | pud_clear_bad(pud); | |
1242 | return 1; | |
1243 | } | |
1244 | return 0; | |
1245 | } | |
1246 | ||
1247 | /* See pmd_trans_unstable for discussion. */ | |
1248 | static inline int pud_trans_unstable(pud_t *pud) | |
1249 | { | |
1250 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \ | |
1251 | defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) | |
1252 | return pud_none_or_trans_huge_or_dev_or_clear_bad(pud); | |
1253 | #else | |
1254 | return 0; | |
1255 | #endif | |
1256 | } | |
1257 | ||
26c19178 AA |
1258 | #ifndef pmd_read_atomic |
1259 | static inline pmd_t pmd_read_atomic(pmd_t *pmdp) | |
1260 | { | |
1261 | /* | |
1262 | * Depend on compiler for an atomic pmd read. NOTE: this is | |
1263 | * only going to work, if the pmdval_t isn't larger than | |
1264 | * an unsigned long. | |
1265 | */ | |
1266 | return *pmdp; | |
1267 | } | |
1268 | #endif | |
1269 | ||
953c66c2 AK |
1270 | #ifndef arch_needs_pgtable_deposit |
1271 | #define arch_needs_pgtable_deposit() (false) | |
1272 | #endif | |
1a5a9906 AA |
1273 | /* |
1274 | * This function is meant to be used by sites walking pagetables with | |
c1e8d7c6 | 1275 | * the mmap_lock held in read mode to protect against MADV_DONTNEED and |
1a5a9906 AA |
1276 | * transhuge page faults. MADV_DONTNEED can convert a transhuge pmd |
1277 | * into a null pmd and the transhuge page fault can convert a null pmd | |
1278 | * into an hugepmd or into a regular pmd (if the hugepage allocation | |
c1e8d7c6 | 1279 | * fails). While holding the mmap_lock in read mode the pmd becomes |
1a5a9906 AA |
1280 | * stable and stops changing under us only if it's not null and not a |
1281 | * transhuge pmd. When those races occurs and this function makes a | |
1282 | * difference vs the standard pmd_none_or_clear_bad, the result is | |
1283 | * undefined so behaving like if the pmd was none is safe (because it | |
1284 | * can return none anyway). The compiler level barrier() is critically | |
1285 | * important to compute the two checks atomically on the same pmdval. | |
26c19178 AA |
1286 | * |
1287 | * For 32bit kernels with a 64bit large pmd_t this automatically takes | |
1288 | * care of reading the pmd atomically to avoid SMP race conditions | |
c1e8d7c6 | 1289 | * against pmd_populate() when the mmap_lock is hold for reading by the |
26c19178 AA |
1290 | * caller (a special atomic read not done by "gcc" as in the generic |
1291 | * version above, is also needed when THP is disabled because the page | |
1292 | * fault can populate the pmd from under us). | |
1a5a9906 AA |
1293 | */ |
1294 | static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd) | |
1295 | { | |
26c19178 | 1296 | pmd_t pmdval = pmd_read_atomic(pmd); |
1a5a9906 AA |
1297 | /* |
1298 | * The barrier will stabilize the pmdval in a register or on | |
1299 | * the stack so that it will stop changing under the code. | |
e4eed03f AA |
1300 | * |
1301 | * When CONFIG_TRANSPARENT_HUGEPAGE=y on x86 32bit PAE, | |
1302 | * pmd_read_atomic is allowed to return a not atomic pmdval | |
1303 | * (for example pointing to an hugepage that has never been | |
1304 | * mapped in the pmd). The below checks will only care about | |
1305 | * the low part of the pmd with 32bit PAE x86 anyway, with the | |
1306 | * exception of pmd_none(). So the important thing is that if | |
1307 | * the low part of the pmd is found null, the high part will | |
1308 | * be also null or the pmd_none() check below would be | |
1309 | * confused. | |
1a5a9906 AA |
1310 | */ |
1311 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
1312 | barrier(); | |
1313 | #endif | |
84c3fc4e ZY |
1314 | /* |
1315 | * !pmd_present() checks for pmd migration entries | |
1316 | * | |
1317 | * The complete check uses is_pmd_migration_entry() in linux/swapops.h | |
1318 | * But using that requires moving current function and pmd_trans_unstable() | |
2eb70aab | 1319 | * to linux/swapops.h to resolve dependency, which is too much code move. |
84c3fc4e ZY |
1320 | * |
1321 | * !pmd_present() is equivalent to is_pmd_migration_entry() currently, | |
1322 | * because !pmd_present() pages can only be under migration not swapped | |
1323 | * out. | |
1324 | * | |
2eb70aab | 1325 | * pmd_none() is preserved for future condition checks on pmd migration |
84c3fc4e ZY |
1326 | * entries and not confusing with this function name, although it is |
1327 | * redundant with !pmd_present(). | |
1328 | */ | |
1329 | if (pmd_none(pmdval) || pmd_trans_huge(pmdval) || | |
1330 | (IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION) && !pmd_present(pmdval))) | |
1a5a9906 AA |
1331 | return 1; |
1332 | if (unlikely(pmd_bad(pmdval))) { | |
ee53664b | 1333 | pmd_clear_bad(pmd); |
1a5a9906 AA |
1334 | return 1; |
1335 | } | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * This is a noop if Transparent Hugepage Support is not built into | |
1341 | * the kernel. Otherwise it is equivalent to | |
1342 | * pmd_none_or_trans_huge_or_clear_bad(), and shall only be called in | |
1343 | * places that already verified the pmd is not none and they want to | |
1344 | * walk ptes while holding the mmap sem in read mode (write mode don't | |
1345 | * need this). If THP is not enabled, the pmd can't go away under the | |
1346 | * code even if MADV_DONTNEED runs, but if THP is enabled we need to | |
1347 | * run a pmd_trans_unstable before walking the ptes after | |
9ef258ba KW |
1348 | * split_huge_pmd returns (because it may have run when the pmd become |
1349 | * null, but then a page fault can map in a THP and not a regular page). | |
1a5a9906 AA |
1350 | */ |
1351 | static inline int pmd_trans_unstable(pmd_t *pmd) | |
1352 | { | |
1353 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
1354 | return pmd_none_or_trans_huge_or_clear_bad(pmd); | |
1355 | #else | |
1356 | return 0; | |
5f6e8da7 | 1357 | #endif |
1a5a9906 AA |
1358 | } |
1359 | ||
f9ce0be7 KS |
1360 | /* |
1361 | * the ordering of these checks is important for pmds with _page_devmap set. | |
1362 | * if we check pmd_trans_unstable() first we will trip the bad_pmd() check | |
1363 | * inside of pmd_none_or_trans_huge_or_clear_bad(). this will end up correctly | |
1364 | * returning 1 but not before it spams dmesg with the pmd_clear_bad() output. | |
1365 | */ | |
1366 | static inline int pmd_devmap_trans_unstable(pmd_t *pmd) | |
1367 | { | |
1368 | return pmd_devmap(*pmd) || pmd_trans_unstable(pmd); | |
1369 | } | |
1370 | ||
e7bb4b6d MG |
1371 | #ifndef CONFIG_NUMA_BALANCING |
1372 | /* | |
1373 | * Technically a PTE can be PROTNONE even when not doing NUMA balancing but | |
1374 | * the only case the kernel cares is for NUMA balancing and is only ever set | |
1375 | * when the VMA is accessible. For PROT_NONE VMAs, the PTEs are not marked | |
1067b261 | 1376 | * _PAGE_PROTNONE so by default, implement the helper as "always no". It |
e7bb4b6d MG |
1377 | * is the responsibility of the caller to distinguish between PROT_NONE |
1378 | * protections and NUMA hinting fault protections. | |
1379 | */ | |
1380 | static inline int pte_protnone(pte_t pte) | |
1381 | { | |
1382 | return 0; | |
1383 | } | |
1384 | ||
1385 | static inline int pmd_protnone(pmd_t pmd) | |
1386 | { | |
1387 | return 0; | |
1388 | } | |
1389 | #endif /* CONFIG_NUMA_BALANCING */ | |
1390 | ||
1a5a9906 | 1391 | #endif /* CONFIG_MMU */ |
5f6e8da7 | 1392 | |
e61ce6ad | 1393 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP |
c2febafc KS |
1394 | |
1395 | #ifndef __PAGETABLE_P4D_FOLDED | |
1396 | int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot); | |
1397 | int p4d_clear_huge(p4d_t *p4d); | |
1398 | #else | |
1399 | static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot) | |
1400 | { | |
1401 | return 0; | |
1402 | } | |
1403 | static inline int p4d_clear_huge(p4d_t *p4d) | |
1404 | { | |
1405 | return 0; | |
1406 | } | |
1407 | #endif /* !__PAGETABLE_P4D_FOLDED */ | |
1408 | ||
e61ce6ad | 1409 | int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot); |
c742199a | 1410 | int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot); |
d8a71905 | 1411 | int pud_clear_huge(pud_t *pud); |
b9820d8f | 1412 | int pmd_clear_huge(pmd_t *pmd); |
8e2d4340 | 1413 | int p4d_free_pud_page(p4d_t *p4d, unsigned long addr); |
785a19f9 CP |
1414 | int pud_free_pmd_page(pud_t *pud, unsigned long addr); |
1415 | int pmd_free_pte_page(pmd_t *pmd, unsigned long addr); | |
e61ce6ad | 1416 | #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ |
c2febafc KS |
1417 | static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot) |
1418 | { | |
1419 | return 0; | |
1420 | } | |
e61ce6ad TK |
1421 | static inline int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot) |
1422 | { | |
1423 | return 0; | |
1424 | } | |
1425 | static inline int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot) | |
1426 | { | |
1427 | return 0; | |
1428 | } | |
c2febafc KS |
1429 | static inline int p4d_clear_huge(p4d_t *p4d) |
1430 | { | |
1431 | return 0; | |
1432 | } | |
b9820d8f TK |
1433 | static inline int pud_clear_huge(pud_t *pud) |
1434 | { | |
1435 | return 0; | |
1436 | } | |
1437 | static inline int pmd_clear_huge(pmd_t *pmd) | |
1438 | { | |
1439 | return 0; | |
1440 | } | |
8e2d4340 WD |
1441 | static inline int p4d_free_pud_page(p4d_t *p4d, unsigned long addr) |
1442 | { | |
1443 | return 0; | |
1444 | } | |
785a19f9 | 1445 | static inline int pud_free_pmd_page(pud_t *pud, unsigned long addr) |
b6bdb751 TK |
1446 | { |
1447 | return 0; | |
1448 | } | |
785a19f9 | 1449 | static inline int pmd_free_pte_page(pmd_t *pmd, unsigned long addr) |
b6bdb751 TK |
1450 | { |
1451 | return 0; | |
1452 | } | |
e61ce6ad TK |
1453 | #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ |
1454 | ||
458aa76d AK |
1455 | #ifndef __HAVE_ARCH_FLUSH_PMD_TLB_RANGE |
1456 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
1457 | /* | |
1458 | * ARCHes with special requirements for evicting THP backing TLB entries can | |
1459 | * implement this. Otherwise also, it can help optimize normal TLB flush in | |
1067b261 RD |
1460 | * THP regime. Stock flush_tlb_range() typically has optimization to nuke the |
1461 | * entire TLB if flush span is greater than a threshold, which will | |
1462 | * likely be true for a single huge page. Thus a single THP flush will | |
1463 | * invalidate the entire TLB which is not desirable. | |
458aa76d AK |
1464 | * e.g. see arch/arc: flush_pmd_tlb_range |
1465 | */ | |
1466 | #define flush_pmd_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end) | |
a00cc7d9 | 1467 | #define flush_pud_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end) |
458aa76d AK |
1468 | #else |
1469 | #define flush_pmd_tlb_range(vma, addr, end) BUILD_BUG() | |
a00cc7d9 | 1470 | #define flush_pud_tlb_range(vma, addr, end) BUILD_BUG() |
458aa76d AK |
1471 | #endif |
1472 | #endif | |
1473 | ||
08ea8c07 BX |
1474 | struct file; |
1475 | int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, | |
1476 | unsigned long size, pgprot_t *vma_prot); | |
613e396b TG |
1477 | |
1478 | #ifndef CONFIG_X86_ESPFIX64 | |
1479 | static inline void init_espfix_bsp(void) { } | |
1480 | #endif | |
1481 | ||
782de70c | 1482 | extern void __init pgtable_cache_init(void); |
caa84136 | 1483 | |
6c26fcd2 JK |
1484 | #ifndef __HAVE_ARCH_PFN_MODIFY_ALLOWED |
1485 | static inline bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot) | |
1486 | { | |
1487 | return true; | |
1488 | } | |
1489 | ||
1490 | static inline bool arch_has_pfn_modify_check(void) | |
1491 | { | |
1492 | return false; | |
1493 | } | |
1494 | #endif /* !_HAVE_ARCH_PFN_MODIFY_ALLOWED */ | |
1495 | ||
a3266bd4 LR |
1496 | /* |
1497 | * Architecture PAGE_KERNEL_* fallbacks | |
1498 | * | |
1499 | * Some architectures don't define certain PAGE_KERNEL_* flags. This is either | |
1500 | * because they really don't support them, or the port needs to be updated to | |
1501 | * reflect the required functionality. Below are a set of relatively safe | |
1502 | * fallbacks, as best effort, which we can count on in lieu of the architectures | |
1503 | * not defining them on their own yet. | |
1504 | */ | |
1505 | ||
1506 | #ifndef PAGE_KERNEL_RO | |
1507 | # define PAGE_KERNEL_RO PAGE_KERNEL | |
1508 | #endif | |
1509 | ||
1a9b4b3d LR |
1510 | #ifndef PAGE_KERNEL_EXEC |
1511 | # define PAGE_KERNEL_EXEC PAGE_KERNEL | |
1512 | #endif | |
1513 | ||
d8626138 JR |
1514 | /* |
1515 | * Page Table Modification bits for pgtbl_mod_mask. | |
1516 | * | |
1517 | * These are used by the p?d_alloc_track*() set of functions an in the generic | |
1518 | * vmalloc/ioremap code to track at which page-table levels entries have been | |
1519 | * modified. Based on that the code can better decide when vmalloc and ioremap | |
1520 | * mapping changes need to be synchronized to other page-tables in the system. | |
1521 | */ | |
1522 | #define __PGTBL_PGD_MODIFIED 0 | |
1523 | #define __PGTBL_P4D_MODIFIED 1 | |
1524 | #define __PGTBL_PUD_MODIFIED 2 | |
1525 | #define __PGTBL_PMD_MODIFIED 3 | |
1526 | #define __PGTBL_PTE_MODIFIED 4 | |
1527 | ||
1528 | #define PGTBL_PGD_MODIFIED BIT(__PGTBL_PGD_MODIFIED) | |
1529 | #define PGTBL_P4D_MODIFIED BIT(__PGTBL_P4D_MODIFIED) | |
1530 | #define PGTBL_PUD_MODIFIED BIT(__PGTBL_PUD_MODIFIED) | |
1531 | #define PGTBL_PMD_MODIFIED BIT(__PGTBL_PMD_MODIFIED) | |
1532 | #define PGTBL_PTE_MODIFIED BIT(__PGTBL_PTE_MODIFIED) | |
1533 | ||
1534 | /* Page-Table Modification Mask */ | |
1535 | typedef unsigned int pgtbl_mod_mask; | |
1536 | ||
1da177e4 LT |
1537 | #endif /* !__ASSEMBLY__ */ |
1538 | ||
cef39703 AB |
1539 | #if !defined(MAX_POSSIBLE_PHYSMEM_BITS) && !defined(CONFIG_64BIT) |
1540 | #ifdef CONFIG_PHYS_ADDR_T_64BIT | |
1541 | /* | |
1542 | * ZSMALLOC needs to know the highest PFN on 32-bit architectures | |
1543 | * with physical address space extension, but falls back to | |
1544 | * BITS_PER_LONG otherwise. | |
1545 | */ | |
1546 | #error Missing MAX_POSSIBLE_PHYSMEM_BITS definition | |
1547 | #else | |
1548 | #define MAX_POSSIBLE_PHYSMEM_BITS 32 | |
1549 | #endif | |
1550 | #endif | |
1551 | ||
fd8cfd30 HD |
1552 | #ifndef has_transparent_hugepage |
1553 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
1554 | #define has_transparent_hugepage() 1 | |
1555 | #else | |
1556 | #define has_transparent_hugepage() 0 | |
1557 | #endif | |
1558 | #endif | |
1559 | ||
1071fc57 MS |
1560 | /* |
1561 | * On some architectures it depends on the mm if the p4d/pud or pmd | |
1562 | * layer of the page table hierarchy is folded or not. | |
1563 | */ | |
1564 | #ifndef mm_p4d_folded | |
1565 | #define mm_p4d_folded(mm) __is_defined(__PAGETABLE_P4D_FOLDED) | |
1566 | #endif | |
1567 | ||
1568 | #ifndef mm_pud_folded | |
1569 | #define mm_pud_folded(mm) __is_defined(__PAGETABLE_PUD_FOLDED) | |
1570 | #endif | |
1571 | ||
1572 | #ifndef mm_pmd_folded | |
1573 | #define mm_pmd_folded(mm) __is_defined(__PAGETABLE_PMD_FOLDED) | |
1574 | #endif | |
1575 | ||
d3f7b1bb VG |
1576 | #ifndef p4d_offset_lockless |
1577 | #define p4d_offset_lockless(pgdp, pgd, address) p4d_offset(&(pgd), address) | |
1578 | #endif | |
1579 | #ifndef pud_offset_lockless | |
1580 | #define pud_offset_lockless(p4dp, p4d, address) pud_offset(&(p4d), address) | |
1581 | #endif | |
1582 | #ifndef pmd_offset_lockless | |
1583 | #define pmd_offset_lockless(pudp, pud, address) pmd_offset(&(pud), address) | |
1584 | #endif | |
1585 | ||
93fab1b2 SP |
1586 | /* |
1587 | * p?d_leaf() - true if this entry is a final mapping to a physical address. | |
1588 | * This differs from p?d_huge() by the fact that they are always available (if | |
1589 | * the architecture supports large pages at the appropriate level) even | |
1590 | * if CONFIG_HUGETLB_PAGE is not defined. | |
1591 | * Only meaningful when called on a valid entry. | |
1592 | */ | |
1593 | #ifndef pgd_leaf | |
1594 | #define pgd_leaf(x) 0 | |
1595 | #endif | |
1596 | #ifndef p4d_leaf | |
1597 | #define p4d_leaf(x) 0 | |
1598 | #endif | |
1599 | #ifndef pud_leaf | |
1600 | #define pud_leaf(x) 0 | |
1601 | #endif | |
1602 | #ifndef pmd_leaf | |
1603 | #define pmd_leaf(x) 0 | |
1604 | #endif | |
1605 | ||
560dabbd PZ |
1606 | #ifndef pgd_leaf_size |
1607 | #define pgd_leaf_size(x) (1ULL << PGDIR_SHIFT) | |
1608 | #endif | |
1609 | #ifndef p4d_leaf_size | |
1610 | #define p4d_leaf_size(x) P4D_SIZE | |
1611 | #endif | |
1612 | #ifndef pud_leaf_size | |
1613 | #define pud_leaf_size(x) PUD_SIZE | |
1614 | #endif | |
1615 | #ifndef pmd_leaf_size | |
1616 | #define pmd_leaf_size(x) PMD_SIZE | |
1617 | #endif | |
1618 | #ifndef pte_leaf_size | |
1619 | #define pte_leaf_size(x) PAGE_SIZE | |
1620 | #endif | |
1621 | ||
c0f8aa4f DA |
1622 | /* |
1623 | * Some architectures have MMUs that are configurable or selectable at boot | |
1624 | * time. These lead to variable PTRS_PER_x. For statically allocated arrays it | |
1625 | * helps to have a static maximum value. | |
1626 | */ | |
1627 | ||
1628 | #ifndef MAX_PTRS_PER_PTE | |
1629 | #define MAX_PTRS_PER_PTE PTRS_PER_PTE | |
1630 | #endif | |
1631 | ||
1632 | #ifndef MAX_PTRS_PER_PMD | |
1633 | #define MAX_PTRS_PER_PMD PTRS_PER_PMD | |
1634 | #endif | |
1635 | ||
1636 | #ifndef MAX_PTRS_PER_PUD | |
1637 | #define MAX_PTRS_PER_PUD PTRS_PER_PUD | |
1638 | #endif | |
1639 | ||
1640 | #ifndef MAX_PTRS_PER_P4D | |
1641 | #define MAX_PTRS_PER_P4D PTRS_PER_P4D | |
1642 | #endif | |
1643 | ||
ca5999fd | 1644 | #endif /* _LINUX_PGTABLE_H */ |