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Date: Tue, 1 Feb 2022 18:01:03 -0800
From: Rajat Jain <rajatja@...gle.com>
To: Rob Herring <robh+dt@...nel.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>, linux-pci@...r.kernel.org,
devicetree@...r.kernel.org,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Bjorn Helgaas <helgaas@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Rajat Jain <rajatxjain@...il.com>,
Dmitry Torokhov <dtor@...gle.com>,
Jesse Barnes <jsbarnes@...gle.com>,
Jean-Philippe Brucker <jean-philippe@...aro.org>,
Pavel Machek <pavel@...x.de>,
"Oliver O'Halloran" <oohall@...il.com>,
Joerg Roedel <joro@...tes.org>
Cc: Rajat Jain <rajatja@...gle.com>
Subject: [PATCH v2 2/2] dt-bindings: Document "UntrustedDevice" property for
PCI devices
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@...gle.com>
---
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@...00000 {
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@...8 {
+ /* 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
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