linux-kernel - Re: [RFC PATCH] Utilize the PCI API in the AGP framework.

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Date:	Mon, 6 Dec 2010 21:12:27 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Dave Airlie <airlied@...hat.com>
Cc:	airlied@...ux.ie, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org, konrad@...nel.org,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [RFC PATCH] Utilize the PCI API in the AGP framework.

> Okay reading that I'm not sure you've started at the right end.

I actually have all of those patches ready but figured I would start
from the AGP side..
> 
> I just read 601341, and it concerns nouveau, which shouldn't on the hw
> described be touching AGP at all. Its a PCIE machine, so the DRM/TTM
> code won't use any of the AGP paths.

I think most of them do touch PCIe cards. I swore that there were
some AGP users out there, maybe they aren't on those bugs - let me search
my mail archive. Maybe it just me who still uses AGP...
> 
> Now if we have fixes for TTM/nouveau/radeon that make it work under Xen
> then that is a whole different story, however these patches are not
> those.

Nope. I just posted them: https://lkml.org/lkml/2010/12/6/516

> 
> I'd suggest you reverse the priority, of the comment
> 
> a) Fix the GART/AGP backend (so drivers/char/agp/*.c) so they use the
> PCI API.
>    Only the i915 and higher are using the PCI API and I've some of the older
>    boxes with i860 so can actually test it.
>  b) Fix the TTM to use the DMA API.
>  c) Lastly, get rid of _PAGE_IOMAP so we don't have to depend on radeon/nouveau/etc
>    to set the proper _PAGE_IOMAP on the PFNs/BARs..
> 
> to do c, then b, and finally figure out if anyone cares about a, unless there is a major dependency in the code that requires this ordering.

There is a patch for c) that is nice and simple:
http://git.kernel.org/?p=linux/kernel/git/konrad/xen.git;a=commit;h=f5d630621f6616a8a14438c047332742e77c0739

but we are working on making that obsolete by .. well I can go in details
but it still is just on pieces of paper.
> 
> Dave.
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