linux-kernel - Re: [PATCH] x86: Add PCI extended config space access for AMD Barcelona

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Message-ID: <20080602193527.722fbbce@infradead.org>
Date:	Mon, 2 Jun 2008 19:35:27 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] x86: Add PCI extended config space access for AMD
 Barcelona

On Mon, 2 Jun 2008 16:19:29 +0200
Robert Richter <robert.richter@....com> wrote:

> Arjan,
> 
> On 28.05.08 12:02:53, Arjan van de Ven wrote:
> > Comment 1:
> > Can we make the 256/4096 thing conditional on actually having the
> > feature somehow? (while not making the code TOO ugly)
> 
> In the first version I had 2 functions also. The patch have had lots
> of duplicate code or inline functions. Since the conditional check is
> already in raw_pci_* I decided to not implement an additional check
> and use only one function.

ok fair enough.

> 
> > Comment 2: 
> > The cpu_has_XXX is a bit dubious; while it's dependent on your cpu
> > model right now, I'm a bit hesitant to consider a PCI feature
> > something that belongs in the cpu_has_XXX namespace. (Yes I know
> > PCI is moving into the cpu package, but on a logical level it seems
> > just the wrong place).
> > Do we need a platform_has_XXX namespace for things like this?
> 
> An alternative implementation would be here to use a check something
> like pci_probe & PCI_HAS_EXT_CFG. If needed, I will send an updated
> patch.

I kind of prefer this, since logically this is a PCI not a CPU property.
Would you mind doing this ?
(not that your current patch is wrong, it's just nicer to keep CPU
stuff with the CPU and PCI stuff with PCI :)
(This wouldn't need to stop inclusion of your current patch, it can
just be an incremental cleanup)

-- 
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