Add ATS support to the SMMUv3 driver. The previous posting was about a year ago, as part of SVA v2 [1]. I feel slightly more confident upstreaming this now that we can disable the feature for untrusted devices. It's a low-hanging fruit in the SVA patch stack, and a good candidate for v5.2. As for testing, there is a public (free as in beer) software model that has both SMMUv3 and a SATA controller with ATS [2]. It's not much since, except for a dev_dbg message, you won't notice a difference when enabling ATS, but it can still be used for checking that the patches don't break anything. [1] https://www.spinics.net/lists/kvm/msg168742.html [2] https://patchwork.kernel.org/patch/10781793/ Jean-Philippe Brucker (4): ACPI/IORT: Check ATS capability in root complex nodes iommu/arm-smmu-v3: Link domains and devices iommu/arm-smmu-v3: Add support for PCI ATS iommu/arm-smmu-v3: Disable tagged pointers drivers/acpi/arm64/iort.c | 11 ++ drivers/iommu/arm-smmu-v3.c | 250 +++++++++++++++++++++++++++++++++++- include/linux/iommu.h | 4 + 3 files changed, 259 insertions(+), 6 deletions(-) -- 2.21.0
