[PATCH 2/2] PCI: OF: Support external-facing property

Jean-Philippe Brucker jean-philippe.brucker at arm.com
Mon Mar 18 11:21:24 PDT 2019


Set the "untrusted" attribute to any PCIe port that has an
"external-facing" device tree property. Any device downstream of this
port will inherit the attribute and have only the strictest IOMMU
protection.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker at arm.com>
---
 drivers/pci/of.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 3d32da15c215..3e7ac7748d90 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -35,6 +35,9 @@ void pci_set_bus_of_node(struct pci_bus *bus)
 		bus->dev.of_node = pcibios_get_phb_of_node(bus);
 	else
 		bus->dev.of_node = of_node_get(bus->self->dev.of_node);
+
+	if (of_get_property(bus->dev.of_node, "external-facing", NULL))
+		bus->self->untrusted = true;
 }
 
 void pci_release_bus_of_node(struct pci_bus *bus)
-- 
2.21.0




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