linux-kernel - [PATCH] pci/quirks: ITE 8893 needs quirk_use_pcie_bridge_dma

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Date:   Mon, 10 Apr 2017 21:01:27 -0400
From:   Jarod Wilson <jarod@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jarod Wilson <jarod@...hat.com>, linux-pci@...r.kernel.org,
        Alex Williamson <alex.williamson@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH] pci/quirks: ITE 8893 needs quirk_use_pcie_bridge_dma_alias

This 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@...hat.com>
CC: linux-pci@...r.kernel.org
CC: Alex Williamson <alex.williamson@...hat.com>
CC: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Jarod Wilson <jarod@...hat.com>
---
 drivers/pci/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 9236e40ac055..c95fbf2431f8 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3914,6 +3914,8 @@ 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);
 
-- 
2.12.1