From: Jarod Wilson Date: Wed, 12 Apr 2017 17:33:04 +0000 (-0500) Subject: PCI: Add bridge DMA alias quirk for ITE 8893 bridge X-Git-Tag: v4.12-rc1~65^2~9^2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fce5d57e5754fa35245f7c41e3942040393e2fb1;p=karo-tx-linux.git 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 Signed-off-by: Jarod Wilson Signed-off-by: Bjorn Helgaas Reviewed-by: Alex Williamson --- diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index f754453fe754..e2e2f7ab1d75 100644 --- 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);