PCI: Add bridge DMA alias quirk for ITE 8893 bridge

The ITE 8893 bridge has the same problems as the ITE 8892, which were resulting in crippling an older PCI 1Gbps NIC down to 45Mbps throughput with IOMMU and VT-d enabled. With the patch, this old e1000 goes back up to ~900Mbps. Suggested-by: Alex Williamson <[email protected]> Signed-off-by: Jarod Wilson <[email protected]> Signed-off-by: Bjorn Helgaas <[email protected]> Reviewed-by: Alex Williamson <[email protected]>
opendata26 · Apr 12, 2017 · fce5d57 · fce5d57
1 parent c1ae3cf
commit fce5d57
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
@@ -3938,6 +3938,8 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ASMEDIA, 0x1080,
 DECLARE_PCI_FIXUP_HEADER(0x10e3, 0x8113, quirk_use_pcie_bridge_dma_alias);
 /* ITE 8892, https://bugzilla.kernel.org/show_bug.cgi?id=73551 */
 DECLARE_PCI_FIXUP_HEADER(0x1283, 0x8892, quirk_use_pcie_bridge_dma_alias);
+/* ITE 8893 has the same problem as the 8892 */
+DECLARE_PCI_FIXUP_HEADER(0x1283, 0x8893, quirk_use_pcie_bridge_dma_alias);
 /* Intel 82801, https://bugzilla.kernel.org/show_bug.cgi?id=44881#c49 */
 DECLARE_PCI_FIXUP_HEADER(0x8086, 0x244e, quirk_use_pcie_bridge_dma_alias);