linux-kernel - RE: [PATCH 3/3] PCI: Add pci_read

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Message-ID: <7A25B56E4BE99C4283EB931CD1A40E1101587039@pdsmsx414.ccr.corp.intel.com>
Date:	Tue, 29 Jul 2008 10:36:49 +0800
From:	"Zhao, Yu" <yu.zhao@...el.com>
To:	"Matthew Wilcox" <matthew@....cx>
Cc:	<linux-kernel@...r.kernel.org>, <eric@...olt.net>,
	"Matthew Wilcox" <willy@...ux.intel.com>,
	<jbarnes@...tuousgeek.org>
Subject: RE: [PATCH 3/3] PCI: Add pci_read_base() API

On Tuesday, July 29, 2008 9:50 AM, Matthew Wilcox <mailto:matthew@....cx> wrote:

> On Tue, Jul 29, 2008 at 09:22:03AM +0800, Zhao, Yu wrote:
>> Greetings,
>> 
>> It would be nice if people can have an enhanced
> pci_update_resource to update non-standard BARs probed by
> pci_read_base. 
> 
> Yes, that would be a natural addition to the API.  However, we don't
> tend to add APIs until we have a use case for them.  Do you have
> anything in the pipeline that could use this feature?  I'm quite happy
> to write the code for you if you do.

There is a new PCIe extended capability SR-IOV, which defines 6 additional BARs encapsulated inside the capability. I'm writing code to support it, and will be using your APIs to probe and update these non-standard BARs.

The SR-IOV specification can be found at:
http://www.pcisig.com/members/downloads/specifications/iov/sr-iov1.0_11Sep07.pdf

Thanks.

> 
> --
> Intel are signing my paycheques ... these opinions are still mine
> "Bill, look, we understand that you're interested in selling us this
> operating system, but compare it to ours.  We can't possibly take such
> a retrograde step."

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