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 <alex.williamson@redhat.com>
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index f754453fe754e985361cb49cee0bddf54d752443..e2e2f7ab1d7508dfa20347972dd882ca016013d9 100644 (file)
--- 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);