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

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Message-ID: <20080523111825.580423e1@infradead.org>
Date:	Fri, 23 May 2008 11:18:25 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
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, 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)

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