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

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Message-ID: <20170410224018.1874ac78@t450s.home>
Date:   Mon, 10 Apr 2017 22:40:18 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Jarod Wilson <jarod@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] pci/quirks: ITE 8893 needs
 quirk_use_pcie_bridge_dma_alias

On Mon, 10 Apr 2017 21:01:27 -0400
Jarod Wilson <jarod@...hat.com> wrote:

> 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);


Reviewed-by: Alex Williamson <alex.williamson@...hat.com>