linux-kernel - Re: [patches] [patch 3/5] x86: Add PCI extended config space access for AMD Barcelona

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Date:	Wed, 05 Sep 2007 11:12:00 +0100
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Robert Richter <robert.richter@....com>
CC:	Andreas Herrmann <andreas.herrmann3@....com>,
	Arjan van de Ven <arjan@...radead.org>, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patches] [patch 3/5] x86: Add PCI extended config space access
 for AMD Barcelona

Robert Richter wrote:
> On 05.09.07 06:58:58, H. Peter Anvin wrote:
> 
>>> But at the moment there is no need for further discussion on this subject
>>> because Andi refuses to add support for Barcelona CF8/CFC ECS access.
>>>
>> Well, they don't add any functionality, do they?  As such, I would agree 
>> with Andi -- we only need one method which can (correctly) access the 
>> full configuration space, since it'll look the same on the bus anyway.
> 
> PCI Devices will not be the same on the bus since PCI read/write
> functions will have different behavior. Without the patches you will
> get an error when accessing ECS with CF8. We need ECS access for
> patches that setups local interrupt vectors. This patches will be
> released soon.

You're missing the point.   How will the PCI bus transactions be 
different when using MMCONFIG versus your extended CF8 version?

> Btw, this patch fixes also config space access with proc/sys fs and
> lspci. I see this as an added functionality as well.

The latter implies the former.  Again, how does this differ from MMCONFIG?

	-hpa

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