linux-kernel - Re: [Fwd: Re: [PATCH 0/5]PCI: x86 MMCONFIG]

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Message-ID: <20071220195021.GA427@jurassic.park.msu.ru>
Date:	Thu, 20 Dec 2007 22:50:21 +0300
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Tony Camuso <tcamuso@...hat.com>, Loic Prylli <loic@...i.com>,
	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz
Subject: Re: [Fwd: Re: [PATCH 0/5]PCI: x86 MMCONFIG]

On Thu, Dec 20, 2007 at 12:08:33PM -0700, Matthew Wilcox wrote:
> On Thu, Dec 20, 2007 at 02:04:31PM -0500, Tony Camuso wrote:
> > Does anybody see a down side to this?
> 
> It'll be slower than it would be if we used mmconfig directly.  Now yes,
> nobody should be using pci config space in performance critical paths
> ... but see the tg3 driver.

Use type 1 just for the first 64 bytes and tg3 will be happy. All we need
is to avoid touching BARs with mmconfig.

Ivan.
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