Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753553Ab1DRBMx (ORCPT ); Sun, 17 Apr 2011 21:12:53 -0400 Received: from mail-iw0-f174.google.com ([209.85.214.174]:41456 "EHLO mail-iw0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751582Ab1DRBMr convert rfc822-to-8bit (ORCPT ); Sun, 17 Apr 2011 21:12:47 -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=YDQ5TGHWPMbGBoHbLeghkKfQ/YxsVk7P9cw8J1Fyr3SXuy5YgwgQH9E/1CyF1onp/o zBeLqKcqVSX8FILmImbFWBRfH6k60I3UWsPx4nRDI3tqPuYiVexfLRY6oc1goDNWnmvA zYHhpPjHG3WdaE8Kc0ihiTHXNUGJEXKwQYxxY= MIME-Version: 1.0 In-Reply-To: <20110417140924.GU18463@8bytes.org> 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: Sun, 17 Apr 2011 21:12:47 -0400 Message-ID: Subject: Re: Linux 2.6.39-rc3 From: Jerome Glisse To: Joerg Roedel Cc: Ingo Molnar , Linus Torvalds , Linux Kernel Mailing List , "dri-devel@lists.freedesktop.org" , Tejun Heo , "H. Peter Anvin" , Thomas Gleixner , Yinghai Lu , 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: 1395 Lines: 32 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? > > ? ? ? ?Joerg > > I can't think of any theory, at that point the wb, irq ring, cp buffer & ib pool are all allocated and pinned into gtt so they all have valid entry backed by a real page. Maybe the GART flush & update is seriously buggy but i expect we would have been hurt sooner by such things. Maybe there is a bug in the hw... wouldn't be surprised. Will try to think to crazy theory. 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/