Hi Doyu-san,
+static void iotlb_lock_set(struct iommu *obj, struct iotlb_lock *l) {
+ u32 val;
+
+ BUG_ON(l->base != 0); /* Currently no preservation is used */
-- Did you notice any issues in the IOMMU driver by enabling the preservation?
Bridge driver is locking the memory segment that is used for IPC in the TLB and by not having the preservation we might see a hit in the performance.
Thank you,
Best regards,
Hari
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