Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _ASM_GENERIC_PGTABLE_H |
2 | #define _ASM_GENERIC_PGTABLE_H | |
3 | ||
673eae82 | 4 | #ifndef __ASSEMBLY__ |
9535239f | 5 | #ifdef CONFIG_MMU |
673eae82 | 6 | |
fbd71844 | 7 | #include <linux/mm_types.h> |
187f1882 | 8 | #include <linux/bug.h> |
e61ce6ad | 9 | #include <linux/errno.h> |
fbd71844 | 10 | |
235a8f02 KS |
11 | #if 4 - defined(__PAGETABLE_PUD_FOLDED) - defined(__PAGETABLE_PMD_FOLDED) != \ |
12 | CONFIG_PGTABLE_LEVELS | |
13 | #error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{PUD,PMD}_FOLDED | |
14 | #endif | |
15 | ||
6ee8630e HD |
16 | /* |
17 | * On almost all architectures and configurations, 0 can be used as the | |
18 | * upper ceiling to free_pgtables(): on many architectures it has the same | |
19 | * effect as using TASK_SIZE. However, there is one configuration which | |
20 | * must impose a more careful limit, to avoid freeing kernel pgtables. | |
21 | */ | |
22 | #ifndef USER_PGTABLES_CEILING | |
23 | #define USER_PGTABLES_CEILING 0UL | |
24 | #endif | |
25 | ||
1da177e4 | 26 | #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
e2cda322 AA |
27 | extern int ptep_set_access_flags(struct vm_area_struct *vma, |
28 | unsigned long address, pte_t *ptep, | |
29 | pte_t entry, int dirty); | |
30 | #endif | |
31 | ||
32 | #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS | |
bd5e88ad | 33 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e2cda322 AA |
34 | extern int pmdp_set_access_flags(struct vm_area_struct *vma, |
35 | unsigned long address, pmd_t *pmdp, | |
36 | pmd_t entry, int dirty); | |
bd5e88ad VG |
37 | #else |
38 | static inline int pmdp_set_access_flags(struct vm_area_struct *vma, | |
39 | unsigned long address, pmd_t *pmdp, | |
40 | pmd_t entry, int dirty) | |
41 | { | |
42 | BUILD_BUG(); | |
43 | return 0; | |
44 | } | |
45 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1da177e4 LT |
46 | #endif |
47 | ||
48 | #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
e2cda322 AA |
49 | static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, |
50 | unsigned long address, | |
51 | pte_t *ptep) | |
52 | { | |
53 | pte_t pte = *ptep; | |
54 | int r = 1; | |
55 | if (!pte_young(pte)) | |
56 | r = 0; | |
57 | else | |
58 | set_pte_at(vma->vm_mm, address, ptep, pte_mkold(pte)); | |
59 | return r; | |
60 | } | |
61 | #endif | |
62 | ||
63 | #ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG | |
64 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
65 | static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, | |
66 | unsigned long address, | |
67 | pmd_t *pmdp) | |
68 | { | |
69 | pmd_t pmd = *pmdp; | |
70 | int r = 1; | |
71 | if (!pmd_young(pmd)) | |
72 | r = 0; | |
73 | else | |
74 | set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd)); | |
75 | return r; | |
76 | } | |
bd5e88ad | 77 | #else |
e2cda322 AA |
78 | static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, |
79 | unsigned long address, | |
80 | pmd_t *pmdp) | |
81 | { | |
bd5e88ad | 82 | BUILD_BUG(); |
e2cda322 AA |
83 | return 0; |
84 | } | |
85 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1da177e4 LT |
86 | #endif |
87 | ||
88 | #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH | |
e2cda322 AA |
89 | int ptep_clear_flush_young(struct vm_area_struct *vma, |
90 | unsigned long address, pte_t *ptep); | |
91 | #endif | |
92 | ||
93 | #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH | |
bd5e88ad VG |
94 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
95 | extern int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
96 | unsigned long address, pmd_t *pmdp); | |
97 | #else | |
98 | /* | |
99 | * Despite relevant to THP only, this API is called from generic rmap code | |
100 | * under PageTransHuge(), hence needs a dummy implementation for !THP | |
101 | */ | |
102 | static inline int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
103 | unsigned long address, pmd_t *pmdp) | |
104 | { | |
105 | BUILD_BUG(); | |
106 | return 0; | |
107 | } | |
108 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1da177e4 LT |
109 | #endif |
110 | ||
1da177e4 | 111 | #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR |
e2cda322 AA |
112 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, |
113 | unsigned long address, | |
114 | pte_t *ptep) | |
115 | { | |
116 | pte_t pte = *ptep; | |
117 | pte_clear(mm, address, ptep); | |
118 | return pte; | |
119 | } | |
120 | #endif | |
121 | ||
8809aa2d | 122 | #ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR |
e2cda322 | 123 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
8809aa2d AK |
124 | static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, |
125 | unsigned long address, | |
126 | pmd_t *pmdp) | |
e2cda322 AA |
127 | { |
128 | pmd_t pmd = *pmdp; | |
2d28a227 | 129 | pmd_clear(pmdp); |
e2cda322 | 130 | return pmd; |
49b24d6b | 131 | } |
e2cda322 | 132 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
1da177e4 LT |
133 | #endif |
134 | ||
8809aa2d | 135 | #ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL |
fcbe08d6 | 136 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
8809aa2d | 137 | static inline pmd_t pmdp_huge_get_and_clear_full(struct mm_struct *mm, |
fcbe08d6 MS |
138 | unsigned long address, pmd_t *pmdp, |
139 | int full) | |
140 | { | |
8809aa2d | 141 | return pmdp_huge_get_and_clear(mm, address, pmdp); |
fcbe08d6 MS |
142 | } |
143 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
144 | #endif | |
145 | ||
a600388d | 146 | #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL |
e2cda322 AA |
147 | static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, |
148 | unsigned long address, pte_t *ptep, | |
149 | int full) | |
150 | { | |
151 | pte_t pte; | |
152 | pte = ptep_get_and_clear(mm, address, ptep); | |
153 | return pte; | |
154 | } | |
a600388d ZA |
155 | #endif |
156 | ||
9888a1ca ZA |
157 | /* |
158 | * Some architectures may be able to avoid expensive synchronization | |
159 | * primitives when modifications are made to PTE's which are already | |
160 | * not present, or in the process of an address space destruction. | |
161 | */ | |
162 | #ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL | |
e2cda322 AA |
163 | static inline void pte_clear_not_present_full(struct mm_struct *mm, |
164 | unsigned long address, | |
165 | pte_t *ptep, | |
166 | int full) | |
167 | { | |
168 | pte_clear(mm, address, ptep); | |
169 | } | |
a600388d ZA |
170 | #endif |
171 | ||
1da177e4 | 172 | #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH |
e2cda322 AA |
173 | extern pte_t ptep_clear_flush(struct vm_area_struct *vma, |
174 | unsigned long address, | |
175 | pte_t *ptep); | |
176 | #endif | |
177 | ||
8809aa2d AK |
178 | #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH |
179 | extern pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, | |
e2cda322 AA |
180 | unsigned long address, |
181 | pmd_t *pmdp); | |
1da177e4 LT |
182 | #endif |
183 | ||
184 | #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT | |
8c65b4a6 | 185 | struct mm_struct; |
1da177e4 LT |
186 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) |
187 | { | |
188 | pte_t old_pte = *ptep; | |
189 | set_pte_at(mm, address, ptep, pte_wrprotect(old_pte)); | |
190 | } | |
191 | #endif | |
192 | ||
e2cda322 AA |
193 | #ifndef __HAVE_ARCH_PMDP_SET_WRPROTECT |
194 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
195 | static inline void pmdp_set_wrprotect(struct mm_struct *mm, | |
196 | unsigned long address, pmd_t *pmdp) | |
197 | { | |
198 | pmd_t old_pmd = *pmdp; | |
199 | set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd)); | |
200 | } | |
bd5e88ad | 201 | #else |
e2cda322 AA |
202 | static inline void pmdp_set_wrprotect(struct mm_struct *mm, |
203 | unsigned long address, pmd_t *pmdp) | |
204 | { | |
bd5e88ad | 205 | BUILD_BUG(); |
e2cda322 AA |
206 | } |
207 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
208 | #endif | |
209 | ||
210 | #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH | |
73636b1a CM |
211 | extern void pmdp_splitting_flush(struct vm_area_struct *vma, |
212 | unsigned long address, pmd_t *pmdp); | |
e2cda322 AA |
213 | #endif |
214 | ||
15a25b2e AK |
215 | #ifndef pmdp_collapse_flush |
216 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
f28b6ff8 AK |
217 | extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, |
218 | unsigned long address, pmd_t *pmdp); | |
15a25b2e AK |
219 | #else |
220 | static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, | |
221 | unsigned long address, | |
222 | pmd_t *pmdp) | |
223 | { | |
224 | BUILD_BUG(); | |
225 | return *pmdp; | |
226 | } | |
227 | #define pmdp_collapse_flush pmdp_collapse_flush | |
228 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
229 | #endif | |
230 | ||
e3ebcf64 | 231 | #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT |
6b0b50b0 AK |
232 | extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, |
233 | pgtable_t pgtable); | |
e3ebcf64 GS |
234 | #endif |
235 | ||
236 | #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW | |
6b0b50b0 | 237 | extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); |
e3ebcf64 GS |
238 | #endif |
239 | ||
46dcde73 GS |
240 | #ifndef __HAVE_ARCH_PMDP_INVALIDATE |
241 | extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, | |
242 | pmd_t *pmdp); | |
243 | #endif | |
244 | ||
1da177e4 | 245 | #ifndef __HAVE_ARCH_PTE_SAME |
e2cda322 AA |
246 | static inline int pte_same(pte_t pte_a, pte_t pte_b) |
247 | { | |
248 | return pte_val(pte_a) == pte_val(pte_b); | |
249 | } | |
250 | #endif | |
251 | ||
45961722 KW |
252 | #ifndef __HAVE_ARCH_PTE_UNUSED |
253 | /* | |
254 | * Some architectures provide facilities to virtualization guests | |
255 | * so that they can flag allocated pages as unused. This allows the | |
256 | * host to transparently reclaim unused pages. This function returns | |
257 | * whether the pte's page is unused. | |
258 | */ | |
259 | static inline int pte_unused(pte_t pte) | |
260 | { | |
261 | return 0; | |
262 | } | |
263 | #endif | |
264 | ||
e2cda322 AA |
265 | #ifndef __HAVE_ARCH_PMD_SAME |
266 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
267 | static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) | |
268 | { | |
269 | return pmd_val(pmd_a) == pmd_val(pmd_b); | |
270 | } | |
271 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
272 | static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) | |
273 | { | |
bd5e88ad | 274 | BUILD_BUG(); |
e2cda322 AA |
275 | return 0; |
276 | } | |
277 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
1da177e4 LT |
278 | #endif |
279 | ||
1da177e4 LT |
280 | #ifndef __HAVE_ARCH_PGD_OFFSET_GATE |
281 | #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr) | |
282 | #endif | |
283 | ||
0b0968a3 | 284 | #ifndef __HAVE_ARCH_MOVE_PTE |
8b1f3124 | 285 | #define move_pte(pte, prot, old_addr, new_addr) (pte) |
8b1f3124 NP |
286 | #endif |
287 | ||
2c3cf556 | 288 | #ifndef pte_accessible |
20841405 | 289 | # define pte_accessible(mm, pte) ((void)(pte), 1) |
2c3cf556 RR |
290 | #endif |
291 | ||
61c77326 SL |
292 | #ifndef flush_tlb_fix_spurious_fault |
293 | #define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address) | |
294 | #endif | |
295 | ||
0634a632 PM |
296 | #ifndef pgprot_noncached |
297 | #define pgprot_noncached(prot) (prot) | |
298 | #endif | |
299 | ||
2520bd31 | 300 | #ifndef pgprot_writecombine |
301 | #define pgprot_writecombine pgprot_noncached | |
302 | #endif | |
303 | ||
d1b4bfbf TK |
304 | #ifndef pgprot_writethrough |
305 | #define pgprot_writethrough pgprot_noncached | |
306 | #endif | |
307 | ||
8b921acf LD |
308 | #ifndef pgprot_device |
309 | #define pgprot_device pgprot_noncached | |
310 | #endif | |
311 | ||
64e45507 PF |
312 | #ifndef pgprot_modify |
313 | #define pgprot_modify pgprot_modify | |
314 | static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) | |
315 | { | |
316 | if (pgprot_val(oldprot) == pgprot_val(pgprot_noncached(oldprot))) | |
317 | newprot = pgprot_noncached(newprot); | |
318 | if (pgprot_val(oldprot) == pgprot_val(pgprot_writecombine(oldprot))) | |
319 | newprot = pgprot_writecombine(newprot); | |
320 | if (pgprot_val(oldprot) == pgprot_val(pgprot_device(oldprot))) | |
321 | newprot = pgprot_device(newprot); | |
322 | return newprot; | |
323 | } | |
324 | #endif | |
325 | ||
1da177e4 | 326 | /* |
8f6c99c1 HD |
327 | * When walking page tables, get the address of the next boundary, |
328 | * or the end address of the range if that comes earlier. Although no | |
329 | * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout. | |
1da177e4 LT |
330 | */ |
331 | ||
1da177e4 LT |
332 | #define pgd_addr_end(addr, end) \ |
333 | ({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \ | |
334 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
335 | }) | |
1da177e4 LT |
336 | |
337 | #ifndef pud_addr_end | |
338 | #define pud_addr_end(addr, end) \ | |
339 | ({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \ | |
340 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
341 | }) | |
342 | #endif | |
343 | ||
344 | #ifndef pmd_addr_end | |
345 | #define pmd_addr_end(addr, end) \ | |
346 | ({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \ | |
347 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
348 | }) | |
349 | #endif | |
350 | ||
1da177e4 LT |
351 | /* |
352 | * When walking page tables, we usually want to skip any p?d_none entries; | |
353 | * and any p?d_bad entries - reporting the error before resetting to none. | |
354 | * Do the tests inline, but report and clear the bad entry in mm/memory.c. | |
355 | */ | |
356 | void pgd_clear_bad(pgd_t *); | |
357 | void pud_clear_bad(pud_t *); | |
358 | void pmd_clear_bad(pmd_t *); | |
359 | ||
360 | static inline int pgd_none_or_clear_bad(pgd_t *pgd) | |
361 | { | |
362 | if (pgd_none(*pgd)) | |
363 | return 1; | |
364 | if (unlikely(pgd_bad(*pgd))) { | |
365 | pgd_clear_bad(pgd); | |
366 | return 1; | |
367 | } | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static inline int pud_none_or_clear_bad(pud_t *pud) | |
372 | { | |
373 | if (pud_none(*pud)) | |
374 | return 1; | |
375 | if (unlikely(pud_bad(*pud))) { | |
376 | pud_clear_bad(pud); | |
377 | return 1; | |
378 | } | |
379 | return 0; | |
380 | } | |
381 | ||
382 | static inline int pmd_none_or_clear_bad(pmd_t *pmd) | |
383 | { | |
384 | if (pmd_none(*pmd)) | |
385 | return 1; | |
386 | if (unlikely(pmd_bad(*pmd))) { | |
387 | pmd_clear_bad(pmd); | |
388 | return 1; | |
389 | } | |
390 | return 0; | |
391 | } | |
9535239f | 392 | |
1ea0704e JF |
393 | static inline pte_t __ptep_modify_prot_start(struct mm_struct *mm, |
394 | unsigned long addr, | |
395 | pte_t *ptep) | |
396 | { | |
397 | /* | |
398 | * Get the current pte state, but zero it out to make it | |
399 | * non-present, preventing the hardware from asynchronously | |
400 | * updating it. | |
401 | */ | |
402 | return ptep_get_and_clear(mm, addr, ptep); | |
403 | } | |
404 | ||
405 | static inline void __ptep_modify_prot_commit(struct mm_struct *mm, | |
406 | unsigned long addr, | |
407 | pte_t *ptep, pte_t pte) | |
408 | { | |
409 | /* | |
410 | * The pte is non-present, so there's no hardware state to | |
411 | * preserve. | |
412 | */ | |
413 | set_pte_at(mm, addr, ptep, pte); | |
414 | } | |
415 | ||
416 | #ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION | |
417 | /* | |
418 | * Start a pte protection read-modify-write transaction, which | |
419 | * protects against asynchronous hardware modifications to the pte. | |
420 | * The intention is not to prevent the hardware from making pte | |
421 | * updates, but to prevent any updates it may make from being lost. | |
422 | * | |
423 | * This does not protect against other software modifications of the | |
424 | * pte; the appropriate pte lock must be held over the transation. | |
425 | * | |
426 | * Note that this interface is intended to be batchable, meaning that | |
427 | * ptep_modify_prot_commit may not actually update the pte, but merely | |
428 | * queue the update to be done at some later time. The update must be | |
429 | * actually committed before the pte lock is released, however. | |
430 | */ | |
431 | static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, | |
432 | unsigned long addr, | |
433 | pte_t *ptep) | |
434 | { | |
435 | return __ptep_modify_prot_start(mm, addr, ptep); | |
436 | } | |
437 | ||
438 | /* | |
439 | * Commit an update to a pte, leaving any hardware-controlled bits in | |
440 | * the PTE unmodified. | |
441 | */ | |
442 | static inline void ptep_modify_prot_commit(struct mm_struct *mm, | |
443 | unsigned long addr, | |
444 | pte_t *ptep, pte_t pte) | |
445 | { | |
446 | __ptep_modify_prot_commit(mm, addr, ptep, pte); | |
447 | } | |
448 | #endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */ | |
fe1a6875 | 449 | #endif /* CONFIG_MMU */ |
1ea0704e | 450 | |
9535239f GU |
451 | /* |
452 | * A facility to provide lazy MMU batching. This allows PTE updates and | |
453 | * page invalidations to be delayed until a call to leave lazy MMU mode | |
454 | * is issued. Some architectures may benefit from doing this, and it is | |
455 | * beneficial for both shadow and direct mode hypervisors, which may batch | |
456 | * the PTE updates which happen during this window. Note that using this | |
457 | * interface requires that read hazards be removed from the code. A read | |
458 | * hazard could result in the direct mode hypervisor case, since the actual | |
459 | * write to the page tables may not yet have taken place, so reads though | |
460 | * a raw PTE pointer after it has been modified are not guaranteed to be | |
461 | * up to date. This mode can only be entered and left under the protection of | |
462 | * the page table locks for all page tables which may be modified. In the UP | |
463 | * case, this is required so that preemption is disabled, and in the SMP case, | |
464 | * it must synchronize the delayed page table writes properly on other CPUs. | |
465 | */ | |
466 | #ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE | |
467 | #define arch_enter_lazy_mmu_mode() do {} while (0) | |
468 | #define arch_leave_lazy_mmu_mode() do {} while (0) | |
469 | #define arch_flush_lazy_mmu_mode() do {} while (0) | |
470 | #endif | |
471 | ||
472 | /* | |
7fd7d83d JF |
473 | * A facility to provide batching of the reload of page tables and |
474 | * other process state with the actual context switch code for | |
475 | * paravirtualized guests. By convention, only one of the batched | |
476 | * update (lazy) modes (CPU, MMU) should be active at any given time, | |
477 | * entry should never be nested, and entry and exits should always be | |
478 | * paired. This is for sanity of maintaining and reasoning about the | |
479 | * kernel code. In this case, the exit (end of the context switch) is | |
480 | * in architecture-specific code, and so doesn't need a generic | |
481 | * definition. | |
9535239f | 482 | */ |
7fd7d83d | 483 | #ifndef __HAVE_ARCH_START_CONTEXT_SWITCH |
224101ed | 484 | #define arch_start_context_switch(prev) do {} while (0) |
9535239f GU |
485 | #endif |
486 | ||
0f8975ec PE |
487 | #ifndef CONFIG_HAVE_ARCH_SOFT_DIRTY |
488 | static inline int pte_soft_dirty(pte_t pte) | |
489 | { | |
490 | return 0; | |
491 | } | |
492 | ||
493 | static inline int pmd_soft_dirty(pmd_t pmd) | |
494 | { | |
495 | return 0; | |
496 | } | |
497 | ||
498 | static inline pte_t pte_mksoft_dirty(pte_t pte) | |
499 | { | |
500 | return pte; | |
501 | } | |
502 | ||
503 | static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) | |
504 | { | |
505 | return pmd; | |
506 | } | |
179ef71c | 507 | |
a7b76174 MS |
508 | static inline pte_t pte_clear_soft_dirty(pte_t pte) |
509 | { | |
510 | return pte; | |
511 | } | |
512 | ||
513 | static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) | |
514 | { | |
515 | return pmd; | |
516 | } | |
517 | ||
179ef71c CG |
518 | static inline pte_t pte_swp_mksoft_dirty(pte_t pte) |
519 | { | |
520 | return pte; | |
521 | } | |
522 | ||
523 | static inline int pte_swp_soft_dirty(pte_t pte) | |
524 | { | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) | |
529 | { | |
530 | return pte; | |
531 | } | |
0f8975ec PE |
532 | #endif |
533 | ||
34801ba9 | 534 | #ifndef __HAVE_PFNMAP_TRACKING |
535 | /* | |
5180da41 SS |
536 | * Interfaces that can be used by architecture code to keep track of |
537 | * memory type of pfn mappings specified by the remap_pfn_range, | |
538 | * vm_insert_pfn. | |
539 | */ | |
540 | ||
541 | /* | |
542 | * track_pfn_remap is called when a _new_ pfn mapping is being established | |
543 | * by remap_pfn_range() for physical range indicated by pfn and size. | |
34801ba9 | 544 | */ |
5180da41 | 545 | static inline int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, |
b3b9c293 KK |
546 | unsigned long pfn, unsigned long addr, |
547 | unsigned long size) | |
34801ba9 | 548 | { |
549 | return 0; | |
550 | } | |
551 | ||
552 | /* | |
5180da41 SS |
553 | * track_pfn_insert is called when a _new_ single pfn is established |
554 | * by vm_insert_pfn(). | |
555 | */ | |
556 | static inline int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, | |
557 | unsigned long pfn) | |
558 | { | |
559 | return 0; | |
560 | } | |
561 | ||
562 | /* | |
563 | * track_pfn_copy is called when vma that is covering the pfnmap gets | |
34801ba9 | 564 | * copied through copy_page_range(). |
565 | */ | |
5180da41 | 566 | static inline int track_pfn_copy(struct vm_area_struct *vma) |
34801ba9 | 567 | { |
568 | return 0; | |
569 | } | |
570 | ||
571 | /* | |
34801ba9 | 572 | * untrack_pfn_vma is called while unmapping a pfnmap for a region. |
573 | * untrack can be called for a specific region indicated by pfn and size or | |
5180da41 | 574 | * can be for the entire vma (in which case pfn, size are zero). |
34801ba9 | 575 | */ |
5180da41 SS |
576 | static inline void untrack_pfn(struct vm_area_struct *vma, |
577 | unsigned long pfn, unsigned long size) | |
34801ba9 | 578 | { |
579 | } | |
580 | #else | |
5180da41 | 581 | extern int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, |
b3b9c293 KK |
582 | unsigned long pfn, unsigned long addr, |
583 | unsigned long size); | |
5180da41 SS |
584 | extern int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, |
585 | unsigned long pfn); | |
586 | extern int track_pfn_copy(struct vm_area_struct *vma); | |
587 | extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, | |
588 | unsigned long size); | |
34801ba9 | 589 | #endif |
590 | ||
816422ad KS |
591 | #ifdef __HAVE_COLOR_ZERO_PAGE |
592 | static inline int is_zero_pfn(unsigned long pfn) | |
593 | { | |
594 | extern unsigned long zero_pfn; | |
595 | unsigned long offset_from_zero_pfn = pfn - zero_pfn; | |
596 | return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT); | |
597 | } | |
598 | ||
2f91ec8c KS |
599 | #define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr)) |
600 | ||
816422ad KS |
601 | #else |
602 | static inline int is_zero_pfn(unsigned long pfn) | |
603 | { | |
604 | extern unsigned long zero_pfn; | |
605 | return pfn == zero_pfn; | |
606 | } | |
607 | ||
608 | static inline unsigned long my_zero_pfn(unsigned long addr) | |
609 | { | |
610 | extern unsigned long zero_pfn; | |
611 | return zero_pfn; | |
612 | } | |
613 | #endif | |
614 | ||
1a5a9906 AA |
615 | #ifdef CONFIG_MMU |
616 | ||
5f6e8da7 AA |
617 | #ifndef CONFIG_TRANSPARENT_HUGEPAGE |
618 | static inline int pmd_trans_huge(pmd_t pmd) | |
619 | { | |
620 | return 0; | |
621 | } | |
622 | static inline int pmd_trans_splitting(pmd_t pmd) | |
623 | { | |
624 | return 0; | |
625 | } | |
e2cda322 AA |
626 | #ifndef __HAVE_ARCH_PMD_WRITE |
627 | static inline int pmd_write(pmd_t pmd) | |
628 | { | |
629 | BUG(); | |
630 | return 0; | |
631 | } | |
632 | #endif /* __HAVE_ARCH_PMD_WRITE */ | |
1a5a9906 AA |
633 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
634 | ||
26c19178 AA |
635 | #ifndef pmd_read_atomic |
636 | static inline pmd_t pmd_read_atomic(pmd_t *pmdp) | |
637 | { | |
638 | /* | |
639 | * Depend on compiler for an atomic pmd read. NOTE: this is | |
640 | * only going to work, if the pmdval_t isn't larger than | |
641 | * an unsigned long. | |
642 | */ | |
643 | return *pmdp; | |
644 | } | |
645 | #endif | |
646 | ||
b3084f4d AK |
647 | #ifndef pmd_move_must_withdraw |
648 | static inline int pmd_move_must_withdraw(spinlock_t *new_pmd_ptl, | |
649 | spinlock_t *old_pmd_ptl) | |
650 | { | |
651 | /* | |
652 | * With split pmd lock we also need to move preallocated | |
653 | * PTE page table if new_pmd is on different PMD page table. | |
654 | */ | |
655 | return new_pmd_ptl != old_pmd_ptl; | |
656 | } | |
657 | #endif | |
658 | ||
1a5a9906 AA |
659 | /* |
660 | * This function is meant to be used by sites walking pagetables with | |
661 | * the mmap_sem hold in read mode to protect against MADV_DONTNEED and | |
662 | * transhuge page faults. MADV_DONTNEED can convert a transhuge pmd | |
663 | * into a null pmd and the transhuge page fault can convert a null pmd | |
664 | * into an hugepmd or into a regular pmd (if the hugepage allocation | |
665 | * fails). While holding the mmap_sem in read mode the pmd becomes | |
666 | * stable and stops changing under us only if it's not null and not a | |
667 | * transhuge pmd. When those races occurs and this function makes a | |
668 | * difference vs the standard pmd_none_or_clear_bad, the result is | |
669 | * undefined so behaving like if the pmd was none is safe (because it | |
670 | * can return none anyway). The compiler level barrier() is critically | |
671 | * important to compute the two checks atomically on the same pmdval. | |
26c19178 AA |
672 | * |
673 | * For 32bit kernels with a 64bit large pmd_t this automatically takes | |
674 | * care of reading the pmd atomically to avoid SMP race conditions | |
675 | * against pmd_populate() when the mmap_sem is hold for reading by the | |
676 | * caller (a special atomic read not done by "gcc" as in the generic | |
677 | * version above, is also needed when THP is disabled because the page | |
678 | * fault can populate the pmd from under us). | |
1a5a9906 AA |
679 | */ |
680 | static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd) | |
681 | { | |
26c19178 | 682 | pmd_t pmdval = pmd_read_atomic(pmd); |
1a5a9906 AA |
683 | /* |
684 | * The barrier will stabilize the pmdval in a register or on | |
685 | * the stack so that it will stop changing under the code. | |
e4eed03f AA |
686 | * |
687 | * When CONFIG_TRANSPARENT_HUGEPAGE=y on x86 32bit PAE, | |
688 | * pmd_read_atomic is allowed to return a not atomic pmdval | |
689 | * (for example pointing to an hugepage that has never been | |
690 | * mapped in the pmd). The below checks will only care about | |
691 | * the low part of the pmd with 32bit PAE x86 anyway, with the | |
692 | * exception of pmd_none(). So the important thing is that if | |
693 | * the low part of the pmd is found null, the high part will | |
694 | * be also null or the pmd_none() check below would be | |
695 | * confused. | |
1a5a9906 AA |
696 | */ |
697 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
698 | barrier(); | |
699 | #endif | |
ee53664b | 700 | if (pmd_none(pmdval) || pmd_trans_huge(pmdval)) |
1a5a9906 AA |
701 | return 1; |
702 | if (unlikely(pmd_bad(pmdval))) { | |
ee53664b | 703 | pmd_clear_bad(pmd); |
1a5a9906 AA |
704 | return 1; |
705 | } | |
706 | return 0; | |
707 | } | |
708 | ||
709 | /* | |
710 | * This is a noop if Transparent Hugepage Support is not built into | |
711 | * the kernel. Otherwise it is equivalent to | |
712 | * pmd_none_or_trans_huge_or_clear_bad(), and shall only be called in | |
713 | * places that already verified the pmd is not none and they want to | |
714 | * walk ptes while holding the mmap sem in read mode (write mode don't | |
715 | * need this). If THP is not enabled, the pmd can't go away under the | |
716 | * code even if MADV_DONTNEED runs, but if THP is enabled we need to | |
717 | * run a pmd_trans_unstable before walking the ptes after | |
718 | * split_huge_page_pmd returns (because it may have run when the pmd | |
719 | * become null, but then a page fault can map in a THP and not a | |
720 | * regular page). | |
721 | */ | |
722 | static inline int pmd_trans_unstable(pmd_t *pmd) | |
723 | { | |
724 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
725 | return pmd_none_or_trans_huge_or_clear_bad(pmd); | |
726 | #else | |
727 | return 0; | |
5f6e8da7 | 728 | #endif |
1a5a9906 AA |
729 | } |
730 | ||
e7bb4b6d MG |
731 | #ifndef CONFIG_NUMA_BALANCING |
732 | /* | |
733 | * Technically a PTE can be PROTNONE even when not doing NUMA balancing but | |
734 | * the only case the kernel cares is for NUMA balancing and is only ever set | |
735 | * when the VMA is accessible. For PROT_NONE VMAs, the PTEs are not marked | |
736 | * _PAGE_PROTNONE so by by default, implement the helper as "always no". It | |
737 | * is the responsibility of the caller to distinguish between PROT_NONE | |
738 | * protections and NUMA hinting fault protections. | |
739 | */ | |
740 | static inline int pte_protnone(pte_t pte) | |
741 | { | |
742 | return 0; | |
743 | } | |
744 | ||
745 | static inline int pmd_protnone(pmd_t pmd) | |
746 | { | |
747 | return 0; | |
748 | } | |
749 | #endif /* CONFIG_NUMA_BALANCING */ | |
750 | ||
1a5a9906 | 751 | #endif /* CONFIG_MMU */ |
5f6e8da7 | 752 | |
e61ce6ad TK |
753 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP |
754 | int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot); | |
755 | int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot); | |
b9820d8f TK |
756 | int pud_clear_huge(pud_t *pud); |
757 | int pmd_clear_huge(pmd_t *pmd); | |
e61ce6ad TK |
758 | #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ |
759 | static inline int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot) | |
760 | { | |
761 | return 0; | |
762 | } | |
763 | static inline int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot) | |
764 | { | |
765 | return 0; | |
766 | } | |
b9820d8f TK |
767 | static inline int pud_clear_huge(pud_t *pud) |
768 | { | |
769 | return 0; | |
770 | } | |
771 | static inline int pmd_clear_huge(pmd_t *pmd) | |
772 | { | |
773 | return 0; | |
774 | } | |
e61ce6ad TK |
775 | #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ |
776 | ||
1da177e4 LT |
777 | #endif /* !__ASSEMBLY__ */ |
778 | ||
40d158e6 AV |
779 | #ifndef io_remap_pfn_range |
780 | #define io_remap_pfn_range remap_pfn_range | |
781 | #endif | |
782 | ||
1da177e4 | 783 | #endif /* _ASM_GENERIC_PGTABLE_H */ |