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[0/2] PCI: Describe external-facing ports in device tree

Message ID 20190318182124.53859-1-jean-philippe.brucker@arm.com (mailing list archive)
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Series PCI: Describe external-facing ports in device tree | expand

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Jean-Philippe Brucker March 18, 2019, 6:21 p.m. UTC 
Add an "external-facing" property to PCI ports in device-tree, to help
identify untrusted devices. The notion of untrusted PCI devices was
added to the v5.0 kernel to describe devices that should have strict
IOMMU protection [1], for example devices that are plugged in a
thunderbolt port. ACPI systems use the ExternalFacingPort property [2].
Add an equivalent mechanism to device tree.

[1] https://lkml.org/lkml/2018/11/26/631
[2] https://docs.microsoft.com/en-us/windows-hardware/drivers/pci/dsd-for-pcie-root-ports#identifying-externally-exposed-pcie-root-ports

Jean-Philippe Brucker (2):
  dt-bindings: Add external-facing PCIe port property
  PCI: OF: Support external-facing property

 Documentation/devicetree/bindings/pci/pci.txt | 47 +++++++++++++++++++
 drivers/pci/of.c                              |  3 ++
 2 files changed, 50 insertions(+)