Re: [PATCH] PCI: Add ACS support for AMD A88X southbridge devices

From: Alex Williamson
Date: Thu Oct 02 2014 - 09:47:30 EST


On Thu, 2014-10-02 at 16:05 +0300, Marti Raudsepp wrote:
> AMD has confirmed that peer-to-peer between two southbridge functions
> does not occur.
>
> Joel Schopp at https://bugzilla.kernel.org/show_bug.cgi?id=81841#c15
> > +-14.4-[01]----05.0 Dialogic Corporation PRI
> > The legacy PCI should be isolated from the other devices identified.
> > Not sure what is going on here.
> >
> > +-14.5 Advanced Micro Devices, Inc. [AMD] FCH USB OHCI Controller
> > This OHCI Controller should also be isolated from the other devices.
>
> Signed-off-by: Marti Raudsepp <marti@xxxxxxxxx>

The bugzilla comments aren't quite as decisive as I'd like to see for a
quirk, so I think we should probably get an ACK from Joel before
including this. Thanks,

Alex

> ---
> drivers/pci/quirks.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 80c2d01..ce43316 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3582,6 +3582,11 @@ struct pci_dev *pci_get_dma_source(struct pci_dev *dev)
> * 1002:439d SB7x0/SB8x0/SB9x0 LPC host controller
> * 1002:4384 SBx00 PCI to PCI Bridge
> * 1002:4399 SB7x0/SB8x0/SB9x0 USB OHCI2 Controller
> + *
> + * https://bugzilla.kernel.org/show_bug.cgi?id=81841#c15
> + *
> + * 1022:780f [AMD] FCH PCI Bridge
> + * 1022:7809 [AMD] FCH USB OHCI Controller
> */
> static int pci_quirk_amd_sb_acs(struct pci_dev *dev, u16 acs_flags)
> {
> @@ -3675,6 +3680,8 @@ static const struct pci_dev_acs_enabled {
> { PCI_VENDOR_ID_ATI, 0x439d, pci_quirk_amd_sb_acs },
> { PCI_VENDOR_ID_ATI, 0x4384, pci_quirk_amd_sb_acs },
> { PCI_VENDOR_ID_ATI, 0x4399, pci_quirk_amd_sb_acs },
> + { PCI_VENDOR_ID_AMD, 0x780f, pci_quirk_amd_sb_acs },
> + { PCI_VENDOR_ID_AMD, 0x7809, pci_quirk_amd_sb_acs },
> { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_intel_pch_acs },
> { 0 }
> };



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