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

From: Yinghai Lu
Date: Fri May 23 2008 - 15:06:38 EST

On Fri, May 23, 2008 at 11:18 AM, Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote:
> On Fri, 23 May 2008 10:57:22 -0700
> "Yinghai Lu" <yhlu.kernel@xxxxxxxxx> wrote:
>> On Fri, May 23, 2008 at 5:46 AM, Robert Richter
>> <robert.richter@xxxxxxx> 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.

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