Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755826Ab1DRQfT (ORCPT ); Mon, 18 Apr 2011 12:35:19 -0400 Received: from mail-qy0-f181.google.com ([209.85.216.181]:45227 "EHLO mail-qy0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755714Ab1DRQfQ convert rfc822-to-8bit (ORCPT ); Mon, 18 Apr 2011 12:35:16 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=lRBtaKZnw48PMNBzRondrLPbUxosXGelr02gcJ9+MXFyneCqrIx+0om6GiItr1oAHf H4z8WuByQKXUmfIpBMHmlPwQ0KSKdAL/TubjTirEByLzZxIAd09MdB0v7DXodvsc4sAP sV2IVS3CrCltjOFnfJdDdc/98oOgtj0yg9w+I= MIME-Version: 1.0 In-Reply-To: References: <4DA655E7.3000904@zytor.com> <20110415131152.GJ18463@8bytes.org> <20110415131650.GB18660@elte.hu> <20110415154604.GN18463@8bytes.org> <20110416163509.GS18463@8bytes.org> <20110417140924.GU18463@8bytes.org> Date: Mon, 18 Apr 2011 12:35:15 -0400 Message-ID: Subject: Re: Linux 2.6.39-rc3 From: Alex Deucher To: Jerome Glisse Cc: Joerg Roedel , Yinghai Lu , Linux Kernel Mailing List , "dri-devel@lists.freedesktop.org" , "H. Peter Anvin" , Tejun Heo , Linus Torvalds , Thomas Gleixner , alexandre.f.demers@gmail.com Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2160 Lines: 53 On Mon, Apr 18, 2011 at 11:59 AM, Jerome Glisse wrote: > On Mon, Apr 18, 2011 at 11:33 AM, Alex Deucher wrote: >> On Mon, Apr 18, 2011 at 11:29 AM, Jerome Glisse wrote: >>> On Mon, Apr 18, 2011 at 11:23 AM, Alex Deucher wrote: >>>> On Sun, Apr 17, 2011 at 10:09 AM, Joerg Roedel wrote: >>>>> 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? >>>>> >>>> >>>> I can't think of anything off hand. ?It might be worth disabling the >>>> call to r600_ib_test() in r600_init() and then seeing if you get any >>>> errors when the fences are used later on when X starts or just at that >>>> point in the module load sequence. ?What's odd is that when you tested >>>> radeon.no_wb=1 you got the same behavior as that disables shadowing of >>>> fence writes to gpu gart mem, so it wouldn't be writing to memory in >>>> that case. >>>> >>>> Alex >>>> >>> >>> It might be the irq ring write that is faulty. >> >> That's disabled with no_wb=1 as well. >> >> Alex >> > > I mean the irq interrupt ring, i don't see this being disabled when no_wb=1 I meant the IH ring pointer writeback. The ih ring itself is still in gart memory. Alex > > Cheers, > Jerome > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/