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 <rajatja@xxxxxxxxxx>
---
v2: Initial version (added documentation based on comments)
v1: Does not exist.
Documentation/devicetree/bindings/pci/pci.txt | 35 +++++++++++++++++++
1 file changed, 35 insertions(+)
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:
+ Scope (\_SB.PCI0.WFA3)
+ {
+ Name (_DSD, Package (0x02) // _DSD: Device-Specific Data
+ {
+ ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301") /* Device
+ Properties for _DSD */,
+ Package (0x01)
+ {
+ Package (0x02)
+ {
+ "UntrustedDevice",
+ One
+ }
+ }
+ })
+ }
--
2.35.0.rc2.247.g8bbb082509-goog
