[0/4] Add PCI ATS support to Arm SMMUv3

Message

Jean-Philippe Brucker March 20, 2019, 5:36 p.m. UTC

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(-)