diff options
| author | Rajat Jain <rajatja@google.com> | 2020-07-07 15:46:03 -0700 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2020-07-10 14:03:13 -0500 |
| commit | 99b50be9d8ec9ef319cc7d5de07f4d405fac7764 (patch) | |
| tree | be02a9fb43919b4fb5ac42f8b728d48d0dc6988d /include/linux/pci.h | |
| parent | 52fbf5bdeeef415b28b8e6cdade1e48927927f60 (diff) | |
PCI: Treat "external-facing" devices themselves as internal
"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>
Diffstat (limited to 'include/linux/pci.h')
| -rw-r--r-- | include/linux/pci.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index a26be5332bba..7a40cd5caed0 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -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; |