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

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Message-ID: <20080810004750.GA2617@colo.lackof.org>
Date:	Sat, 9 Aug 2008 18:47:50 -0600
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Grant Grundler <grundler@...isc-linux.org>,
	jbarnes@...tuousgeek.org, linux-kernel@...r.kernel.org,
	eric@...olt.net, Matthew Wilcox <willy@...ux.intel.com>
Subject: Re: [PATCH 3/3] PCI: Add pci_read_base() API

On Wed, Aug 06, 2008 at 08:38:45AM -0600, Matthew Wilcox wrote:
> On Mon, Aug 04, 2008 at 12:38:33AM -0600, Grant Grundler wrote:
> > On Mon, Jul 28, 2008 at 01:39:01PM -0400, Matthew Wilcox wrote:
> > > Some devices have a BAR at a non-standard address.  The pci_read_base()
> > > API allows us to probe these BARs and fill in a resource for it as if
> > > they were standard BARs.
> > 
> > Willy,
> > Can you add a comment to the code listing the offending device?
> > That way we know how to test next time this code changes.
> 
> It's not an offending device -- devices are allowed to put whatever they
> want anywhere outside the first 0x40 bytes of config space.

Sorry - bad phrasing on my part.

> Eric Anholt's patches add a user for this interface.

ok - people will find the "user" in the email archives now.

> If you want to see an
> example, download the Intel 3 Series Express Chipset Family Datashee
> (the filename is 316966.pdf) and see section 5.1.13 about the MCHBAR.

This would be a suitable comment in the code.
My point still stands: The next person modifying the code will
need to know how/what to test and where to look it up.

thanks,
grant
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