include/linux/mmu_notifier.h

19  * @MMU_NOTIFY_UNMAP: either munmap() that unmap the range or a mremap() that
20  * move the range
25  * @MMU_NOTIFY_PROTECTION_VMA: update is due to protection change for the range
26  * ie using the vma access permission (vm_page_prot) to update the whole range
31  * pages in the range so to mirror those changes the user must inspect the CPU
40  * that the mm refcount is zero and the range is no longer accessible.
48  * exclusive range the owner will be initialised to the value provided by the
139 	 * the pages in the range, it has to implement the
145 	 * establishment of sptes is forbidden in the range passed to
150 	 * range are still mapped and have at least a refcount of one.
153 	 * range have been unmapped and the pages have been freed by
185 				      const struct mmu_notifier_range *range);
187 				     const struct mmu_notifier_range *range);
248  *              range. This function can sleep. Return false only if sleeping
249  *              was required but mmu_notifier_range_blockable(range) is false.
253 			   const struct mmu_notifier_range *range,
340  * mmu_interval_read_retry - End a read side critical section against a VA range
402 mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range);
405 mmu_notifier_range_blockable(const struct mmu_notifier_range *range)
407 	return (range->flags & MMU_NOTIFIER_RANGE_BLOCKABLE);
450 mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
455 	if (mm_has_notifiers(range->mm)) {
456 		range->flags |= MMU_NOTIFIER_RANGE_BLOCKABLE;
457 		__mmu_notifier_invalidate_range_start(range);
465  * case you're not allowed to modify PTEs in the specified range.
470 mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range)
475 	if (mm_has_notifiers(range->mm)) {
476 		range->flags &= ~MMU_NOTIFIER_RANGE_BLOCKABLE;
477 		ret = __mmu_notifier_invalidate_range_start(range);
484 mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range)
486 	if (mmu_notifier_range_blockable(range))
489 	if (mm_has_notifiers(range->mm))
490 		__mmu_notifier_invalidate_range_end(range);
512 static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
519 	range->event = event;
520 	range->mm = mm;
521 	range->start = start;
522 	range->end = end;
523 	range->flags = flags;
527 			struct mmu_notifier_range *range,
532 	mmu_notifier_range_init(range, event, flags, mm, start, end);
533 	range->owner = owner;
611 static inline void _mmu_notifier_range_init(struct mmu_notifier_range *range,
615 	range->start = start;
616 	range->end = end;
619 #define mmu_notifier_range_init(range,event,flags,mm,start,end)  \
620 	_mmu_notifier_range_init(range, start, end)
621 #define mmu_notifier_range_init_owner(range, event, flags, mm, start, \
623 	_mmu_notifier_range_init(range, start, end)
626 mmu_notifier_range_blockable(const struct mmu_notifier_range *range)
659 mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
664 mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range)
670 void mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range)