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

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Message-ID: <542D5EB8.7080602@amd.com>
Date:	Thu, 2 Oct 2014 09:18:32 -0500
From:	Joel Schopp <joel.schopp@....com>
To:	Alex Williamson <alex.williamson@...hat.com>,
	Marti Raudsepp <marti@...fo.org>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: Add ACS support for AMD A88X southbridge devices


On 10/02/2014 08:47 AM, Alex Williamson wrote:
> 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@...fo.org>
> 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,

My apologies for not being as clear as I could have been in the 
bugzilla.  These are isolated.  Acked-by is below.

>
> 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 }
>>   };

Acked-by: Joel Schopp <joel.schopp@....com>
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