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

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Date:	Sun, 02 Mar 2008 12:05:05 +0100
From:	"Gerhard Pircher" <gerhard_pircher@....net>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>, airlied@...ux.ie
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.sourceforge.net,
	linuxppc-dev@...abs.org
Subject: [BUG/RFC/PATCH] drm: Fix for non-coherent DMA PowerPC

Hi,

-------- Original-Nachricht --------
> Datum: Mon, 26 Nov 2007 10:41:58 +1100
> Von: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> An: David Airlie <airlied@...ux.ie>
> CC: linuxppc-dev@...abs.org, dri-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
> Betreff: [RFC/PATCH] drm: Fix for non-coherent DMA PowerPC

> This patch fixes bits of the DRM so to make the radeon DRI work on
> non-cache coherent PCI DMA variants of the PowerPC processors.
> 
> It moves the few places that needs change to wrappers to that
> other architectures with similar issues can easily add their
> own changes to those wrappers, at least until we have more useful
> generic kernel API.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

Xorg (v7.1.1, Debian Etch) crashes with this patch (applied to 2.6.25-rc3)
on my AmigaOne with a Radeon 9200 (PCIGART mode enabled). See the attached
log file for the stack trace.

regards,

Gerhard
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View attachment "dri_crash.log" of type "text/x-log" (67026 bytes)