linux-kernel - Re: Enable mmconf access to PCI ECS for all AMD fam10h systems

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Date:	Fri, 23 May 2008 12:06:27 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Arjan van de Ven" <arjan@...radead.org>
Cc:	"Robert Richter" <robert.richter@....com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	"Andi Kleen" <andi@...stfloor.org>
Subject: Re: Enable mmconf access to PCI ECS for all AMD fam10h systems

On Fri, May 23, 2008 at 11:18 AM, Arjan van de Ven <arjan@...radead.org> wrote:
> On Fri, 23 May 2008 10:57:22 -0700
> "Yinghai Lu" <yhlu.kernel@...il.com> wrote:
>
>> On Fri, May 23, 2008 at 5:46 AM, Robert Richter
>> <robert.richter@....com> wrote:
>> > Yinghai,
>> >
>> > We would like to enable ECS for all fam10h systems. What was the
>> > reason for patch 5f0b2976 that enables it for Sun systems only? If
>> > there are no objections, this patch should be reverted.
>>
>> Someone express the concern about touching MSR. Arjan or Andi?
>>
>> for those of system that doesn't have MCFG table there, they could use
>> pci=check_enable_amd_mmconf to enable it forcely.
>
> using MMIO if the bios doesn't allow it via MCFG is a huge mistake and
> shouldn't be done.
>
> Using the extended port IO version is actually perfectly reasonable to
> me and I would encourage that to be in the kernel (and be used in favor
> of MCFG if the port IO method is there)

that extend access via port IO on AMD Fam10h doesn't support pci
domain other than domain 0.

YH
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