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PCI: Treat "external-facing" devices themselves as internal

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"External-facing" devices are internal devices that expose PCIe hierarchies
such as Thunderbolt outside the platform [1].  Previously these internal
devices were marked as "untrusted" the same as devices downstream from
them.

Use the ACPI or DT information to identify external-facing devices, but
only mark the devices *downstream* from them as "untrusted" [2].  The
external-facing device itself is no longer marked as untrusted.

[1] https://docs.microsoft.com/en-us/windows-hardware/drivers/pci/dsd-for-pcie-root-ports#identifying-externally-exposed-pcie-root-ports
[2] https://lore.kernel.org/linux-pci/20200610230906.GA1528594@bjorn-Precision-5520/
Link: https://lore.kernel.org/r/20200707224604.3737893-3-rajatja@google.com
Signed-off-by: Rajat Jain <rajatja@google.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Rajat Jain
2020-07-07 15:46:03 -07:00
committed by Bjorn Helgaas
parent 52fbf5bdee
commit 99b50be9d8
5 changed files with 15 additions and 10 deletions
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6
include/linux/pci.h
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@@ -432,6 +432,12 @@ struct pci_dev {
* mappings to make sure they cannot access arbitrary memory.
*/
unsigned int untrusted:1;
/*
* Info from the platform, e.g., ACPI or device tree, may mark a
* device as "external-facing". An external-facing device is
* itself internal but devices downstream from it are external.
*/
unsigned int external_facing:1;
unsigned int broken_intx_masking:1; /* INTx masking can't be used */
unsigned int io_window_1k:1; /* Intel bridge 1K I/O windows */
unsigned int irq_managed:1;