Commit fce5d57e authored by Jarod Wilson's avatar Jarod Wilson Committed by Bjorn Helgaas
Browse files

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: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarJarod Wilson <jarod@redhat.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent c1ae3cfa

drivers/pci/quirks.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

CRA Git | Maintained and supported by SUSTech CRA and CCSE