linux-kernel - Re: Linux 2.6.39-rc3

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Message-ID: <20110417140924.GU18463@8bytes.org>
Date:	Sun, 17 Apr 2011 16:09:24 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Jerome Glisse <j.glisse@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Tejun Heo <tj@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.org>, alexandre.f.demers@...il.com
Subject: Re: Linux 2.6.39-rc3

On Sat, Apr 16, 2011 at 02:54:04PM -0400, Jerome Glisse wrote:

> If you want to go the printk way you can add printk before each test
> ring_test, ib_test in r600.c this 2 functions are the own that might
> trigger the first GPU gart activities.

Okay, I found the place in source that triggers this. It happens in the
function r600_ib_test. The interesting thing is that not the ib-command
itself is responsible but the fence that is emitted afterwards (proved
by removing the fence command, where the problem went away).
I don't know enough about the command semantics to make a guess what
goes wrong there. But maybe you GPU folks have an idea?

	Joerg

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