drivers/iommu/io-pgfault.c

3  * Handle device page faults
33  * @partial: faults that are part of a Page Request Group for which the last
50 	struct list_head		faults;  member
85 	list_for_each_entry_safe(iopf, next, &group->faults, list) {  in iopf_handler()
88 		 * faults in the group if there is an error.  in iopf_handler()
111  * them before reporting faults. A PASID Stop Marker (LRW = 0b100) doesn't
131  * request completes, outstanding faults will have been dealt with by the time
137  * freed after the device has stopped generating page faults (or the iommu
138  * hardware has been set to block the page faults) and the pending page faults
184 		 * need to clean up before leaving, otherwise partial faults  in iommu_queue_iopf()
193 	INIT_LIST_HEAD(&group->faults);  in iommu_queue_iopf()
194 	list_add(&group->last_fault.list, &group->faults);  in iommu_queue_iopf()
197 	/* See if we have partial faults for this group */  in iommu_queue_iopf()
201 			list_move(&iopf->list, &group->faults);  in iommu_queue_iopf()
219  * iopf_queue_flush_dev - Ensure that all queued faults have been processed
220  * @dev: the endpoint whose faults need to be flushed.
223  * pending faults for this PASID have been handled, and won't hit the address
253  * @queue: the queue whose partial faults need to be discarded
255  * When the hardware queue overflows, last page faults in a group may have been
256  * lost and the IOMMU driver calls this to discard all partial faults. The
257  * driver shouldn't be adding new faults to this queue concurrently.
328  * Caller makes sure that no more faults are reported for this device.
355 	/* Just in case some faults are still stuck */  in iopf_queue_remove_device()
380 	 * The WQ is unordered because the low-level handler enqueues faults by  in iopf_queue_alloc()
402  * Counterpart to iopf_queue_alloc(). The driver must not be queuing faults or