>> The Tegra Next Generation SOC uses arm-smmu-v3, but it doesn't have support for BTM. >> Do you have plan to get your earlier patch to handle invalidate notifications into upstream sometime soon? >> Can the dependency on BTM be relaxed with the patch? >> >> PATCH v9 13/13] iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops >> https://www.spinics.net/lists/arm-kernel/msg825099.html >This patch (which should be in 5.11) only takes care of sending ATC invalidations to PCIe endpoints. With this, BTM is still required to invalidate SMMU TLBs. > However we could enable command-queue invalidation when ARM_SMMU_FEAT_BTM isn't set. > Invalidations are still a relatively rare event so it may not be outrageously slow. I can add a patch to my tree if you have hardware to test. Thanks! We can test the patch on emulation platform. -KR
