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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
cddb8a5c AA |
2 | #ifndef _LINUX_MMU_NOTIFIER_H |
3 | #define _LINUX_MMU_NOTIFIER_H | |
4 | ||
5 | #include <linux/list.h> | |
6 | #include <linux/spinlock.h> | |
7 | #include <linux/mm_types.h> | |
21a92735 | 8 | #include <linux/srcu.h> |
cddb8a5c AA |
9 | |
10 | struct mmu_notifier; | |
11 | struct mmu_notifier_ops; | |
12 | ||
d87f055b JG |
13 | /** |
14 | * enum mmu_notifier_event - reason for the mmu notifier callback | |
15 | * @MMU_NOTIFY_UNMAP: either munmap() that unmap the range or a mremap() that | |
16 | * move the range | |
17 | * | |
18 | * @MMU_NOTIFY_CLEAR: clear page table entry (many reasons for this like | |
19 | * madvise() or replacing a page by another one, ...). | |
20 | * | |
21 | * @MMU_NOTIFY_PROTECTION_VMA: update is due to protection change for the range | |
22 | * ie using the vma access permission (vm_page_prot) to update the whole range | |
23 | * is enough no need to inspect changes to the CPU page table (mprotect() | |
24 | * syscall) | |
25 | * | |
26 | * @MMU_NOTIFY_PROTECTION_PAGE: update is due to change in read/write flag for | |
27 | * pages in the range so to mirror those changes the user must inspect the CPU | |
28 | * page table (from the end callback). | |
29 | * | |
30 | * @MMU_NOTIFY_SOFT_DIRTY: soft dirty accounting (still same page and same | |
31 | * access flags). User should soft dirty the page in the end callback to make | |
32 | * sure that anyone relying on soft dirtyness catch pages that might be written | |
33 | * through non CPU mappings. | |
34 | */ | |
35 | enum mmu_notifier_event { | |
36 | MMU_NOTIFY_UNMAP = 0, | |
37 | MMU_NOTIFY_CLEAR, | |
38 | MMU_NOTIFY_PROTECTION_VMA, | |
39 | MMU_NOTIFY_PROTECTION_PAGE, | |
40 | MMU_NOTIFY_SOFT_DIRTY, | |
41 | }; | |
42 | ||
cddb8a5c AA |
43 | #ifdef CONFIG_MMU_NOTIFIER |
44 | ||
23b68395 DV |
45 | #ifdef CONFIG_LOCKDEP |
46 | extern struct lockdep_map __mmu_notifier_invalidate_range_start_map; | |
47 | #endif | |
48 | ||
cddb8a5c AA |
49 | /* |
50 | * The mmu notifier_mm structure is allocated and installed in | |
51 | * mm->mmu_notifier_mm inside the mm_take_all_locks() protected | |
52 | * critical section and it's released only when mm_count reaches zero | |
53 | * in mmdrop(). | |
54 | */ | |
55 | struct mmu_notifier_mm { | |
56 | /* all mmu notifiers registerd in this mm are queued in this list */ | |
57 | struct hlist_head list; | |
58 | /* to serialize the list modifications and hlist_unhashed */ | |
59 | spinlock_t lock; | |
60 | }; | |
61 | ||
27560ee9 JG |
62 | #define MMU_NOTIFIER_RANGE_BLOCKABLE (1 << 0) |
63 | ||
5d6527a7 | 64 | struct mmu_notifier_range { |
bf198b2b | 65 | struct vm_area_struct *vma; |
5d6527a7 JG |
66 | struct mm_struct *mm; |
67 | unsigned long start; | |
68 | unsigned long end; | |
27560ee9 | 69 | unsigned flags; |
bf198b2b | 70 | enum mmu_notifier_event event; |
5d6527a7 JG |
71 | }; |
72 | ||
cddb8a5c AA |
73 | struct mmu_notifier_ops { |
74 | /* | |
75 | * Called either by mmu_notifier_unregister or when the mm is | |
76 | * being destroyed by exit_mmap, always before all pages are | |
77 | * freed. This can run concurrently with other mmu notifier | |
78 | * methods (the ones invoked outside the mm context) and it | |
79 | * should tear down all secondary mmu mappings and freeze the | |
80 | * secondary mmu. If this method isn't implemented you've to | |
81 | * be sure that nothing could possibly write to the pages | |
82 | * through the secondary mmu by the time the last thread with | |
83 | * tsk->mm == mm exits. | |
84 | * | |
85 | * As side note: the pages freed after ->release returns could | |
86 | * be immediately reallocated by the gart at an alias physical | |
87 | * address with a different cache model, so if ->release isn't | |
88 | * implemented because all _software_ driven memory accesses | |
89 | * through the secondary mmu are terminated by the time the | |
90 | * last thread of this mm quits, you've also to be sure that | |
91 | * speculative _hardware_ operations can't allocate dirty | |
92 | * cachelines in the cpu that could not be snooped and made | |
93 | * coherent with the other read and write operations happening | |
94 | * through the gart alias address, so leading to memory | |
95 | * corruption. | |
96 | */ | |
97 | void (*release)(struct mmu_notifier *mn, | |
98 | struct mm_struct *mm); | |
99 | ||
100 | /* | |
101 | * clear_flush_young is called after the VM is | |
102 | * test-and-clearing the young/accessed bitflag in the | |
103 | * pte. This way the VM will provide proper aging to the | |
104 | * accesses to the page through the secondary MMUs and not | |
105 | * only to the ones through the Linux pte. | |
57128468 ALC |
106 | * Start-end is necessary in case the secondary MMU is mapping the page |
107 | * at a smaller granularity than the primary MMU. | |
cddb8a5c AA |
108 | */ |
109 | int (*clear_flush_young)(struct mmu_notifier *mn, | |
110 | struct mm_struct *mm, | |
57128468 ALC |
111 | unsigned long start, |
112 | unsigned long end); | |
cddb8a5c | 113 | |
1d7715c6 VD |
114 | /* |
115 | * clear_young is a lightweight version of clear_flush_young. Like the | |
116 | * latter, it is supposed to test-and-clear the young/accessed bitflag | |
117 | * in the secondary pte, but it may omit flushing the secondary tlb. | |
118 | */ | |
119 | int (*clear_young)(struct mmu_notifier *mn, | |
120 | struct mm_struct *mm, | |
121 | unsigned long start, | |
122 | unsigned long end); | |
123 | ||
8ee53820 AA |
124 | /* |
125 | * test_young is called to check the young/accessed bitflag in | |
126 | * the secondary pte. This is used to know if the page is | |
127 | * frequently used without actually clearing the flag or tearing | |
128 | * down the secondary mapping on the page. | |
129 | */ | |
130 | int (*test_young)(struct mmu_notifier *mn, | |
131 | struct mm_struct *mm, | |
132 | unsigned long address); | |
133 | ||
828502d3 IE |
134 | /* |
135 | * change_pte is called in cases that pte mapping to page is changed: | |
136 | * for example, when ksm remaps pte to point to a new shared page. | |
137 | */ | |
138 | void (*change_pte)(struct mmu_notifier *mn, | |
139 | struct mm_struct *mm, | |
140 | unsigned long address, | |
141 | pte_t pte); | |
142 | ||
cddb8a5c AA |
143 | /* |
144 | * invalidate_range_start() and invalidate_range_end() must be | |
145 | * paired and are called only when the mmap_sem and/or the | |
0f0a327f JR |
146 | * locks protecting the reverse maps are held. If the subsystem |
147 | * can't guarantee that no additional references are taken to | |
148 | * the pages in the range, it has to implement the | |
149 | * invalidate_range() notifier to remove any references taken | |
150 | * after invalidate_range_start(). | |
cddb8a5c AA |
151 | * |
152 | * Invalidation of multiple concurrent ranges may be | |
153 | * optionally permitted by the driver. Either way the | |
154 | * establishment of sptes is forbidden in the range passed to | |
155 | * invalidate_range_begin/end for the whole duration of the | |
156 | * invalidate_range_begin/end critical section. | |
157 | * | |
158 | * invalidate_range_start() is called when all pages in the | |
159 | * range are still mapped and have at least a refcount of one. | |
160 | * | |
161 | * invalidate_range_end() is called when all pages in the | |
162 | * range have been unmapped and the pages have been freed by | |
163 | * the VM. | |
164 | * | |
165 | * The VM will remove the page table entries and potentially | |
166 | * the page between invalidate_range_start() and | |
167 | * invalidate_range_end(). If the page must not be freed | |
168 | * because of pending I/O or other circumstances then the | |
169 | * invalidate_range_start() callback (or the initial mapping | |
170 | * by the driver) must make sure that the refcount is kept | |
171 | * elevated. | |
172 | * | |
173 | * If the driver increases the refcount when the pages are | |
174 | * initially mapped into an address space then either | |
175 | * invalidate_range_start() or invalidate_range_end() may | |
176 | * decrease the refcount. If the refcount is decreased on | |
177 | * invalidate_range_start() then the VM can free pages as page | |
178 | * table entries are removed. If the refcount is only | |
179 | * droppped on invalidate_range_end() then the driver itself | |
180 | * will drop the last refcount but it must take care to flush | |
181 | * any secondary tlb before doing the final free on the | |
182 | * page. Pages will no longer be referenced by the linux | |
183 | * address space but may still be referenced by sptes until | |
184 | * the last refcount is dropped. | |
5ff7091f | 185 | * |
93065ac7 MH |
186 | * If blockable argument is set to false then the callback cannot |
187 | * sleep and has to return with -EAGAIN. 0 should be returned | |
33490af3 MH |
188 | * otherwise. Please note that if invalidate_range_start approves |
189 | * a non-blocking behavior then the same applies to | |
190 | * invalidate_range_end. | |
93065ac7 | 191 | * |
cddb8a5c | 192 | */ |
93065ac7 | 193 | int (*invalidate_range_start)(struct mmu_notifier *mn, |
5d6527a7 | 194 | const struct mmu_notifier_range *range); |
cddb8a5c | 195 | void (*invalidate_range_end)(struct mmu_notifier *mn, |
5d6527a7 | 196 | const struct mmu_notifier_range *range); |
0f0a327f JR |
197 | |
198 | /* | |
199 | * invalidate_range() is either called between | |
200 | * invalidate_range_start() and invalidate_range_end() when the | |
201 | * VM has to free pages that where unmapped, but before the | |
202 | * pages are actually freed, or outside of _start()/_end() when | |
203 | * a (remote) TLB is necessary. | |
204 | * | |
205 | * If invalidate_range() is used to manage a non-CPU TLB with | |
206 | * shared page-tables, it not necessary to implement the | |
207 | * invalidate_range_start()/end() notifiers, as | |
208 | * invalidate_range() alread catches the points in time when an | |
0f10851e | 209 | * external TLB range needs to be flushed. For more in depth |
ad56b738 | 210 | * discussion on this see Documentation/vm/mmu_notifier.rst |
0f0a327f | 211 | * |
0f0a327f JR |
212 | * Note that this function might be called with just a sub-range |
213 | * of what was passed to invalidate_range_start()/end(), if | |
214 | * called between those functions. | |
215 | */ | |
216 | void (*invalidate_range)(struct mmu_notifier *mn, struct mm_struct *mm, | |
217 | unsigned long start, unsigned long end); | |
2c7933f5 JG |
218 | |
219 | /* | |
220 | * These callbacks are used with the get/put interface to manage the | |
221 | * lifetime of the mmu_notifier memory. alloc_notifier() returns a new | |
222 | * notifier for use with the mm. | |
223 | * | |
224 | * free_notifier() is only called after the mmu_notifier has been | |
225 | * fully put, calls to any ops callback are prevented and no ops | |
226 | * callbacks are currently running. It is called from a SRCU callback | |
227 | * and cannot sleep. | |
228 | */ | |
229 | struct mmu_notifier *(*alloc_notifier)(struct mm_struct *mm); | |
230 | void (*free_notifier)(struct mmu_notifier *mn); | |
cddb8a5c AA |
231 | }; |
232 | ||
233 | /* | |
234 | * The notifier chains are protected by mmap_sem and/or the reverse map | |
235 | * semaphores. Notifier chains are only changed when all reverse maps and | |
236 | * the mmap_sem locks are taken. | |
237 | * | |
238 | * Therefore notifier chains can only be traversed when either | |
239 | * | |
240 | * 1. mmap_sem is held. | |
c8c06efa | 241 | * 2. One of the reverse map locks is held (i_mmap_rwsem or anon_vma->rwsem). |
cddb8a5c AA |
242 | * 3. No other concurrent thread can access the list (release) |
243 | */ | |
244 | struct mmu_notifier { | |
245 | struct hlist_node hlist; | |
246 | const struct mmu_notifier_ops *ops; | |
2c7933f5 JG |
247 | struct mm_struct *mm; |
248 | struct rcu_head rcu; | |
249 | unsigned int users; | |
cddb8a5c AA |
250 | }; |
251 | ||
252 | static inline int mm_has_notifiers(struct mm_struct *mm) | |
253 | { | |
254 | return unlikely(mm->mmu_notifier_mm); | |
255 | } | |
256 | ||
2c7933f5 JG |
257 | struct mmu_notifier *mmu_notifier_get_locked(const struct mmu_notifier_ops *ops, |
258 | struct mm_struct *mm); | |
259 | static inline struct mmu_notifier * | |
260 | mmu_notifier_get(const struct mmu_notifier_ops *ops, struct mm_struct *mm) | |
261 | { | |
262 | struct mmu_notifier *ret; | |
263 | ||
264 | down_write(&mm->mmap_sem); | |
265 | ret = mmu_notifier_get_locked(ops, mm); | |
266 | up_write(&mm->mmap_sem); | |
267 | return ret; | |
268 | } | |
269 | void mmu_notifier_put(struct mmu_notifier *mn); | |
270 | void mmu_notifier_synchronize(void); | |
271 | ||
cddb8a5c AA |
272 | extern int mmu_notifier_register(struct mmu_notifier *mn, |
273 | struct mm_struct *mm); | |
274 | extern int __mmu_notifier_register(struct mmu_notifier *mn, | |
275 | struct mm_struct *mm); | |
276 | extern void mmu_notifier_unregister(struct mmu_notifier *mn, | |
277 | struct mm_struct *mm); | |
278 | extern void __mmu_notifier_mm_destroy(struct mm_struct *mm); | |
279 | extern void __mmu_notifier_release(struct mm_struct *mm); | |
280 | extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm, | |
57128468 ALC |
281 | unsigned long start, |
282 | unsigned long end); | |
1d7715c6 VD |
283 | extern int __mmu_notifier_clear_young(struct mm_struct *mm, |
284 | unsigned long start, | |
285 | unsigned long end); | |
8ee53820 AA |
286 | extern int __mmu_notifier_test_young(struct mm_struct *mm, |
287 | unsigned long address); | |
828502d3 IE |
288 | extern void __mmu_notifier_change_pte(struct mm_struct *mm, |
289 | unsigned long address, pte_t pte); | |
ac46d4f3 JG |
290 | extern int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *r); |
291 | extern void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *r, | |
4645b9fe | 292 | bool only_end); |
0f0a327f JR |
293 | extern void __mmu_notifier_invalidate_range(struct mm_struct *mm, |
294 | unsigned long start, unsigned long end); | |
c6d23413 JG |
295 | extern bool |
296 | mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range); | |
cddb8a5c | 297 | |
4a83bfe9 JG |
298 | static inline bool |
299 | mmu_notifier_range_blockable(const struct mmu_notifier_range *range) | |
300 | { | |
27560ee9 | 301 | return (range->flags & MMU_NOTIFIER_RANGE_BLOCKABLE); |
4a83bfe9 JG |
302 | } |
303 | ||
cddb8a5c AA |
304 | static inline void mmu_notifier_release(struct mm_struct *mm) |
305 | { | |
306 | if (mm_has_notifiers(mm)) | |
307 | __mmu_notifier_release(mm); | |
308 | } | |
309 | ||
310 | static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm, | |
57128468 ALC |
311 | unsigned long start, |
312 | unsigned long end) | |
cddb8a5c AA |
313 | { |
314 | if (mm_has_notifiers(mm)) | |
57128468 | 315 | return __mmu_notifier_clear_flush_young(mm, start, end); |
cddb8a5c AA |
316 | return 0; |
317 | } | |
318 | ||
1d7715c6 VD |
319 | static inline int mmu_notifier_clear_young(struct mm_struct *mm, |
320 | unsigned long start, | |
321 | unsigned long end) | |
322 | { | |
323 | if (mm_has_notifiers(mm)) | |
324 | return __mmu_notifier_clear_young(mm, start, end); | |
325 | return 0; | |
326 | } | |
327 | ||
8ee53820 AA |
328 | static inline int mmu_notifier_test_young(struct mm_struct *mm, |
329 | unsigned long address) | |
330 | { | |
331 | if (mm_has_notifiers(mm)) | |
332 | return __mmu_notifier_test_young(mm, address); | |
333 | return 0; | |
334 | } | |
335 | ||
828502d3 IE |
336 | static inline void mmu_notifier_change_pte(struct mm_struct *mm, |
337 | unsigned long address, pte_t pte) | |
338 | { | |
339 | if (mm_has_notifiers(mm)) | |
340 | __mmu_notifier_change_pte(mm, address, pte); | |
341 | } | |
342 | ||
ac46d4f3 JG |
343 | static inline void |
344 | mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range) | |
cddb8a5c | 345 | { |
810e24e0 DV |
346 | might_sleep(); |
347 | ||
23b68395 | 348 | lock_map_acquire(&__mmu_notifier_invalidate_range_start_map); |
ac46d4f3 | 349 | if (mm_has_notifiers(range->mm)) { |
27560ee9 | 350 | range->flags |= MMU_NOTIFIER_RANGE_BLOCKABLE; |
ac46d4f3 JG |
351 | __mmu_notifier_invalidate_range_start(range); |
352 | } | |
23b68395 | 353 | lock_map_release(&__mmu_notifier_invalidate_range_start_map); |
93065ac7 MH |
354 | } |
355 | ||
ac46d4f3 JG |
356 | static inline int |
357 | mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range) | |
93065ac7 | 358 | { |
23b68395 DV |
359 | int ret = 0; |
360 | ||
361 | lock_map_acquire(&__mmu_notifier_invalidate_range_start_map); | |
ac46d4f3 | 362 | if (mm_has_notifiers(range->mm)) { |
27560ee9 | 363 | range->flags &= ~MMU_NOTIFIER_RANGE_BLOCKABLE; |
23b68395 | 364 | ret = __mmu_notifier_invalidate_range_start(range); |
ac46d4f3 | 365 | } |
23b68395 DV |
366 | lock_map_release(&__mmu_notifier_invalidate_range_start_map); |
367 | return ret; | |
cddb8a5c AA |
368 | } |
369 | ||
ac46d4f3 JG |
370 | static inline void |
371 | mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range) | |
cddb8a5c | 372 | { |
810e24e0 DV |
373 | if (mmu_notifier_range_blockable(range)) |
374 | might_sleep(); | |
375 | ||
ac46d4f3 JG |
376 | if (mm_has_notifiers(range->mm)) |
377 | __mmu_notifier_invalidate_range_end(range, false); | |
4645b9fe JG |
378 | } |
379 | ||
ac46d4f3 JG |
380 | static inline void |
381 | mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range) | |
4645b9fe | 382 | { |
ac46d4f3 JG |
383 | if (mm_has_notifiers(range->mm)) |
384 | __mmu_notifier_invalidate_range_end(range, true); | |
cddb8a5c AA |
385 | } |
386 | ||
1897bdc4 JR |
387 | static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, |
388 | unsigned long start, unsigned long end) | |
389 | { | |
0f0a327f JR |
390 | if (mm_has_notifiers(mm)) |
391 | __mmu_notifier_invalidate_range(mm, start, end); | |
1897bdc4 JR |
392 | } |
393 | ||
cddb8a5c AA |
394 | static inline void mmu_notifier_mm_init(struct mm_struct *mm) |
395 | { | |
396 | mm->mmu_notifier_mm = NULL; | |
397 | } | |
398 | ||
399 | static inline void mmu_notifier_mm_destroy(struct mm_struct *mm) | |
400 | { | |
401 | if (mm_has_notifiers(mm)) | |
402 | __mmu_notifier_mm_destroy(mm); | |
403 | } | |
404 | ||
ac46d4f3 JG |
405 | |
406 | static inline void mmu_notifier_range_init(struct mmu_notifier_range *range, | |
6f4f13e8 JG |
407 | enum mmu_notifier_event event, |
408 | unsigned flags, | |
409 | struct vm_area_struct *vma, | |
ac46d4f3 JG |
410 | struct mm_struct *mm, |
411 | unsigned long start, | |
412 | unsigned long end) | |
413 | { | |
bf198b2b JG |
414 | range->vma = vma; |
415 | range->event = event; | |
ac46d4f3 JG |
416 | range->mm = mm; |
417 | range->start = start; | |
418 | range->end = end; | |
bf198b2b | 419 | range->flags = flags; |
ac46d4f3 JG |
420 | } |
421 | ||
cddb8a5c AA |
422 | #define ptep_clear_flush_young_notify(__vma, __address, __ptep) \ |
423 | ({ \ | |
424 | int __young; \ | |
425 | struct vm_area_struct *___vma = __vma; \ | |
426 | unsigned long ___address = __address; \ | |
427 | __young = ptep_clear_flush_young(___vma, ___address, __ptep); \ | |
428 | __young |= mmu_notifier_clear_flush_young(___vma->vm_mm, \ | |
57128468 ALC |
429 | ___address, \ |
430 | ___address + \ | |
431 | PAGE_SIZE); \ | |
cddb8a5c AA |
432 | __young; \ |
433 | }) | |
434 | ||
91a4ee26 AA |
435 | #define pmdp_clear_flush_young_notify(__vma, __address, __pmdp) \ |
436 | ({ \ | |
437 | int __young; \ | |
438 | struct vm_area_struct *___vma = __vma; \ | |
439 | unsigned long ___address = __address; \ | |
440 | __young = pmdp_clear_flush_young(___vma, ___address, __pmdp); \ | |
441 | __young |= mmu_notifier_clear_flush_young(___vma->vm_mm, \ | |
57128468 ALC |
442 | ___address, \ |
443 | ___address + \ | |
444 | PMD_SIZE); \ | |
91a4ee26 AA |
445 | __young; \ |
446 | }) | |
447 | ||
1d7715c6 VD |
448 | #define ptep_clear_young_notify(__vma, __address, __ptep) \ |
449 | ({ \ | |
450 | int __young; \ | |
451 | struct vm_area_struct *___vma = __vma; \ | |
452 | unsigned long ___address = __address; \ | |
453 | __young = ptep_test_and_clear_young(___vma, ___address, __ptep);\ | |
454 | __young |= mmu_notifier_clear_young(___vma->vm_mm, ___address, \ | |
455 | ___address + PAGE_SIZE); \ | |
456 | __young; \ | |
457 | }) | |
458 | ||
459 | #define pmdp_clear_young_notify(__vma, __address, __pmdp) \ | |
460 | ({ \ | |
461 | int __young; \ | |
462 | struct vm_area_struct *___vma = __vma; \ | |
463 | unsigned long ___address = __address; \ | |
464 | __young = pmdp_test_and_clear_young(___vma, ___address, __pmdp);\ | |
465 | __young |= mmu_notifier_clear_young(___vma->vm_mm, ___address, \ | |
466 | ___address + PMD_SIZE); \ | |
467 | __young; \ | |
468 | }) | |
469 | ||
34ee645e JR |
470 | #define ptep_clear_flush_notify(__vma, __address, __ptep) \ |
471 | ({ \ | |
472 | unsigned long ___addr = __address & PAGE_MASK; \ | |
473 | struct mm_struct *___mm = (__vma)->vm_mm; \ | |
474 | pte_t ___pte; \ | |
475 | \ | |
476 | ___pte = ptep_clear_flush(__vma, __address, __ptep); \ | |
477 | mmu_notifier_invalidate_range(___mm, ___addr, \ | |
478 | ___addr + PAGE_SIZE); \ | |
479 | \ | |
480 | ___pte; \ | |
481 | }) | |
482 | ||
8809aa2d | 483 | #define pmdp_huge_clear_flush_notify(__vma, __haddr, __pmd) \ |
34ee645e JR |
484 | ({ \ |
485 | unsigned long ___haddr = __haddr & HPAGE_PMD_MASK; \ | |
486 | struct mm_struct *___mm = (__vma)->vm_mm; \ | |
487 | pmd_t ___pmd; \ | |
488 | \ | |
8809aa2d | 489 | ___pmd = pmdp_huge_clear_flush(__vma, __haddr, __pmd); \ |
34ee645e JR |
490 | mmu_notifier_invalidate_range(___mm, ___haddr, \ |
491 | ___haddr + HPAGE_PMD_SIZE); \ | |
492 | \ | |
493 | ___pmd; \ | |
494 | }) | |
495 | ||
a00cc7d9 MW |
496 | #define pudp_huge_clear_flush_notify(__vma, __haddr, __pud) \ |
497 | ({ \ | |
498 | unsigned long ___haddr = __haddr & HPAGE_PUD_MASK; \ | |
499 | struct mm_struct *___mm = (__vma)->vm_mm; \ | |
500 | pud_t ___pud; \ | |
501 | \ | |
502 | ___pud = pudp_huge_clear_flush(__vma, __haddr, __pud); \ | |
503 | mmu_notifier_invalidate_range(___mm, ___haddr, \ | |
504 | ___haddr + HPAGE_PUD_SIZE); \ | |
505 | \ | |
506 | ___pud; \ | |
507 | }) | |
508 | ||
48af0d7c XG |
509 | /* |
510 | * set_pte_at_notify() sets the pte _after_ running the notifier. | |
511 | * This is safe to start by updating the secondary MMUs, because the primary MMU | |
512 | * pte invalidate must have already happened with a ptep_clear_flush() before | |
513 | * set_pte_at_notify() has been invoked. Updating the secondary MMUs first is | |
514 | * required when we change both the protection of the mapping from read-only to | |
515 | * read-write and the pfn (like during copy on write page faults). Otherwise the | |
516 | * old page would remain mapped readonly in the secondary MMUs after the new | |
517 | * page is already writable by some CPU through the primary MMU. | |
518 | */ | |
828502d3 IE |
519 | #define set_pte_at_notify(__mm, __address, __ptep, __pte) \ |
520 | ({ \ | |
521 | struct mm_struct *___mm = __mm; \ | |
522 | unsigned long ___address = __address; \ | |
523 | pte_t ___pte = __pte; \ | |
524 | \ | |
828502d3 | 525 | mmu_notifier_change_pte(___mm, ___address, ___pte); \ |
48af0d7c | 526 | set_pte_at(___mm, ___address, __ptep, ___pte); \ |
828502d3 IE |
527 | }) |
528 | ||
cddb8a5c AA |
529 | #else /* CONFIG_MMU_NOTIFIER */ |
530 | ||
ac46d4f3 JG |
531 | struct mmu_notifier_range { |
532 | unsigned long start; | |
533 | unsigned long end; | |
534 | }; | |
535 | ||
536 | static inline void _mmu_notifier_range_init(struct mmu_notifier_range *range, | |
537 | unsigned long start, | |
538 | unsigned long end) | |
539 | { | |
540 | range->start = start; | |
541 | range->end = end; | |
542 | } | |
543 | ||
6f4f13e8 | 544 | #define mmu_notifier_range_init(range,event,flags,vma,mm,start,end) \ |
ac46d4f3 JG |
545 | _mmu_notifier_range_init(range, start, end) |
546 | ||
4a83bfe9 JG |
547 | static inline bool |
548 | mmu_notifier_range_blockable(const struct mmu_notifier_range *range) | |
549 | { | |
550 | return true; | |
551 | } | |
ac46d4f3 | 552 | |
4d4bbd85 MH |
553 | static inline int mm_has_notifiers(struct mm_struct *mm) |
554 | { | |
555 | return 0; | |
556 | } | |
557 | ||
cddb8a5c AA |
558 | static inline void mmu_notifier_release(struct mm_struct *mm) |
559 | { | |
560 | } | |
561 | ||
562 | static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm, | |
57128468 ALC |
563 | unsigned long start, |
564 | unsigned long end) | |
8ee53820 AA |
565 | { |
566 | return 0; | |
567 | } | |
568 | ||
569 | static inline int mmu_notifier_test_young(struct mm_struct *mm, | |
570 | unsigned long address) | |
cddb8a5c AA |
571 | { |
572 | return 0; | |
573 | } | |
574 | ||
828502d3 IE |
575 | static inline void mmu_notifier_change_pte(struct mm_struct *mm, |
576 | unsigned long address, pte_t pte) | |
577 | { | |
578 | } | |
579 | ||
ac46d4f3 JG |
580 | static inline void |
581 | mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range) | |
cddb8a5c AA |
582 | { |
583 | } | |
584 | ||
ac46d4f3 JG |
585 | static inline int |
586 | mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range) | |
93065ac7 MH |
587 | { |
588 | return 0; | |
589 | } | |
590 | ||
ac46d4f3 JG |
591 | static inline |
592 | void mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range) | |
cddb8a5c AA |
593 | { |
594 | } | |
595 | ||
ac46d4f3 JG |
596 | static inline void |
597 | mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range) | |
4645b9fe JG |
598 | { |
599 | } | |
600 | ||
1897bdc4 JR |
601 | static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, |
602 | unsigned long start, unsigned long end) | |
603 | { | |
604 | } | |
605 | ||
cddb8a5c AA |
606 | static inline void mmu_notifier_mm_init(struct mm_struct *mm) |
607 | { | |
608 | } | |
609 | ||
610 | static inline void mmu_notifier_mm_destroy(struct mm_struct *mm) | |
611 | { | |
612 | } | |
613 | ||
c6d23413 JG |
614 | #define mmu_notifier_range_update_to_read_only(r) false |
615 | ||
cddb8a5c | 616 | #define ptep_clear_flush_young_notify ptep_clear_flush_young |
91a4ee26 | 617 | #define pmdp_clear_flush_young_notify pmdp_clear_flush_young |
33c3fc71 VD |
618 | #define ptep_clear_young_notify ptep_test_and_clear_young |
619 | #define pmdp_clear_young_notify pmdp_test_and_clear_young | |
34ee645e | 620 | #define ptep_clear_flush_notify ptep_clear_flush |
8809aa2d | 621 | #define pmdp_huge_clear_flush_notify pmdp_huge_clear_flush |
a00cc7d9 | 622 | #define pudp_huge_clear_flush_notify pudp_huge_clear_flush |
828502d3 | 623 | #define set_pte_at_notify set_pte_at |
cddb8a5c | 624 | |
2c7933f5 JG |
625 | static inline void mmu_notifier_synchronize(void) |
626 | { | |
627 | } | |
628 | ||
cddb8a5c AA |
629 | #endif /* CONFIG_MMU_NOTIFIER */ |
630 | ||
631 | #endif /* _LINUX_MMU_NOTIFIER_H */ |