Re: [PATCH v2 2/2] dt-bindings: Document "UntrustedDevice" property for PCI devices
From: Rob Herring <robh@kernel.org>
Date: 2022-02-09 21:57:18
Also in:
linux-acpi, linux-pci, lkml
On Tue, Feb 01, 2022 at 06:01:03PM -0800, Rajat Jain wrote:
Add the new "UntrustedDevice" property for PCI devices. This property is optional and can be applied to any PCI device. Signed-off-by: Rajat Jain <redacted> --- v2: Initial version (added documentation based on comments) v1: Does not exist. Documentation/devicetree/bindings/pci/pci.txt | 35 +++++++++++++++++++ 1 file changed, 35 insertions(+)
New properties have to be in a schema which resides here: https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/pci/pci-bus.yaml
quoted hunk ↗ jump to hunk
diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt index 6a8f2874a24d..bc1ba10f51e1 100644 --- a/Documentation/devicetree/bindings/pci/pci.txt +++ b/Documentation/devicetree/bindings/pci/pci.txt@@ -82,3 +82,38 @@ pcie@10000000 { external-facing; }; }; + +PCI Device Properties +--------------------- +Following optional properties may be present for any PCI device: + +- UntrustedDevice: + When present, this property is an indicator that this PCI device (and + any downstream devices) are to be treated as untrusted by the kernel. + The kernel can, for example, use this information to isolate such + devices using a strict DMA protection via the IOMMU. + + Example device tree node: + pcie@0008 { + /* PCI device 00:01.0 is an untrusted device */ + reg = <0x00000800 0 0 0 0>; + UntrustedDevice = <1>; + }; + + Example ACPI node:
Humm, your caret case smelled like ACPI to begin with. As far as ACPI bindings in Documentation/devicetree/bindings/ are concerned, NAK.