iommu/arm-smmu-v3: Invalidate ATC when detaching a device
We make the invalid assumption in arm_smmu_detach_dev() that the ATC is clear after calling pci_disable_ats(). For one thing, only enabling the PCIe ATS capability constitutes an implicit invalidation event, so the comment was wrong. More importantly, the ATS capability isn't necessarily disabled by pci_disable_ats() in a PF, if the associated VFs have ATS enabled. Explicitly invalidate all ATC entries in arm_smmu_detach_dev(). The endpoint cannot form new ATC entries because STE.EATS is clear. Fixes: 9ce27afc ("iommu/arm-smmu-v3: Add support for PCI ATS") Reported-by: NManoj Kumar <Manoj.Kumar3@arm.com> Reported-by: NRobin Murphy <Robin.Murphy@arm.com> Signed-off-by: NJean-Philippe Brucker <jean-philippe.brucker@arm.com> Acked-by: NWill Deacon <will@kernel.org> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
Showing
想要评论请 注册 或 登录