diff options
| author | Nirmoy Das <nirmoyd@nvidia.com> | 2025-12-17 18:45:29 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2026-01-13 20:46:33 +0300 |
| commit | 550a190494a0d3e933dd6f3b2e9c430f94a30a8c (patch) | |
| tree | 8a224a6fd5981431bb89946f45c4d89c778cb674 /include/linux | |
| parent | eeb95c07d5fcaafb1829d5307ce4290cf1dc3190 (diff) | |
| download | linux-550a190494a0d3e933dd6f3b2e9c430f94a30a8c.tar.xz | |
PCI: Add PCI_BRIDGE_NO_ALIAS quirk for ASPEED AST1150
ASPEED BMC controllers have VGA and USB functions behind a PCIe-to-PCI
bridge that causes them to share the same StreamID:
[e0]---00.0-[e1-e2]----00.0-[e2]--+-00.0 ASPEED Graphics Family
\-02.0 ASPEED USB Controller
Both devices get StreamID 0x5e200 due to bridge aliasing, causing the USB
controller to be rejected with 'Aliasing StreamID unsupported'.
Per ASPEED, the AST1150 doesn't use a real PCI bus and always forwards
the original Requester ID from downstream devices rather than replacing
it with any alias.
Add a new PCI_DEV_FLAGS_PCI_BRIDGE_NO_ALIAS flag and apply it to the
AST1150.
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nirmoy Das <nirmoyd@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://patch.msgid.link/20251217154529.377586-2-nirmoyd@nvidia.com
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/pci.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 864775651c6f..48d5b9dac5f1 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -248,6 +248,11 @@ enum pci_dev_flags { PCI_DEV_FLAGS_HAS_MSI_MASKING = (__force pci_dev_flags_t) (1 << 12), /* Device requires write to PCI_MSIX_ENTRY_DATA before any MSIX reads */ PCI_DEV_FLAGS_MSIX_TOUCH_ENTRY_DATA_FIRST = (__force pci_dev_flags_t) (1 << 13), + /* + * PCIe to PCI bridge does not create RID aliases because the bridge is + * integrated with the downstream devices and doesn't use real PCI. + */ + PCI_DEV_FLAGS_PCI_BRIDGE_NO_ALIAS = (__force pci_dev_flags_t) (1 << 14), }; enum pci_irq_reroute_variant { |