linux-kernel - Re: [BUG/RFC/PATCH] drm: Fix for non-coherent DMA PowerPC

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Date:	Mon, 03 Mar 2008 22:37:05 +0100
From:	"Gerhard Pircher" <gerhard_pircher@....net>
To:	benh@...nel.crashing.org
Cc:	linuxppc-dev@...abs.org, dri-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, airlied@...ux.ie
Subject: Re: [BUG/RFC/PATCH] drm: Fix for non-coherent DMA PowerPC


-------- Original-Nachricht --------
> Datum: Tue, 04 Mar 2008 07:44:11 +1100
> Von: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> An: Gerhard Pircher <gerhard_pircher@....net>
> CC: airlied@...ux.ie, linux-kernel@...r.kernel.org, dri-devel@...ts.sourceforge.net, linuxppc-dev@...abs.org
> Betreff: Re: [BUG/RFC/PATCH] drm: Fix for non-coherent DMA PowerPC

> On Mon, 2008-03-03 at 20:51 +0100, Gerhard Pircher wrote:
> > > Remove the GFP_HIGHMEM from the above. It looks like our cache
> > > flushing isn't going to work for highmem, it would need some
> > > kmap's for that.
> 
> > Yes, it looks like this was the problem. No kernel oops anymore.
> > The machine locks up anyway (which is a well known hardware problem).
> > It doesn't lock up with CPPIOMode=true, but probably only because the
> > initialization of DRI fails with "BAD cp_mode (f0000000)!".
> 
> Damn, I wonder why you insist trying to make that machine work :-) The
> hardware is just totally busted.
Because it's a challenge! :) Or because the OS4 developers say that
PCIGART works.

Gerhard
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