From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60210C4363A for ; Wed, 28 Oct 2020 22:44:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0FE1E2072E for ; Wed, 28 Oct 2020 22:44:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389210AbgJ1Wor (ORCPT ); Wed, 28 Oct 2020 18:44:47 -0400 Received: from hosting.gsystem.sk ([212.5.213.30]:50340 "EHLO hosting.gsystem.sk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730295AbgJ1WmX (ORCPT ); Wed, 28 Oct 2020 18:42:23 -0400 Received: from [192.168.0.2] (188-167-68-178.dynamic.chello.sk [188.167.68.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by hosting.gsystem.sk (Postfix) with ESMTPSA id 502DD7A00EE; Wed, 28 Oct 2020 21:15:37 +0100 (CET) From: Ondrej Zary To: Karol Herbst Subject: Re: [Nouveau] nouveau broken on Riva TNT2 in 5.9.0-rc8: GPU not supported on big-endian Date: Wed, 28 Oct 2020 21:15:32 +0100 User-Agent: KMail/1.9.10 Cc: Ilia Mirkin , nouveau , Ben Skeggs , "dri-devel" , LKML References: <202010092326.20482.linux@zary.sk> In-Reply-To: X-KMail-QuotePrefix: > MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <202010282115.32811.linux@zary.sk> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Saturday 10 October 2020 02:02:42 Karol Herbst wrote: > On Sat, Oct 10, 2020 at 12:23 AM Ilia Mirkin wrote: > > > > On Fri, Oct 9, 2020 at 5:54 PM Karol Herbst wrote: > > > > > > On Fri, Oct 9, 2020 at 11:35 PM Ondrej Zary wrote: > > > > > > > > Hello, > > > > I'm testing 5.9.0-rc8 and found that Riva TNT2 stopped working: > > > > [ 0.000000] Linux version 5.9.0-rc8+ (zary@gsql) (gcc (Debian 8.3.0-6) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #326 SMP Fri Oct 9 22:31:40 CEST 2020 > > > > ... > > > > [ 14.771464] nouveau 0000:01:00.0: GPU not supported on big-endian > > > > [ 14.771782] nouveau: probe of 0000:01:00.0 failed with error -38 > > > > > > > > big-endian? WTF? The machine is x86. > > > > > > > > > > mhh, we reworked the endianess checks a bit and apparently that broke > > > something... I will give it some thoughts, but could you be so kind > > > and create an mmiotrace under 5.9 with nouveau? You won't need to > > > start X or anything while doing it. Just enable the trace and modprobe > > > nouveau and collect the trace. > > > > Looks like nvkm_device_endianness unconditionally reads out 0x4. I > > don't think that reg is there pre-NV11. At least NV4, NV5, NV10 and > > maybe NV15 (which is logically pre-NV11) don't support big-endian > > mode. Not sure about NV1A, which was the IGP of the series and IIRC > > logically pre-NV11 as well (but clearly could only be used with x86 > > chips, since it was part of the motherboard). > > > > Aha, it's documented in rnndb: > > > > https://github.com/envytools/envytools/blob/master/rnndb/bus/pmc.xml > > > > > > ohh, I should have checked there.. yeah, will write a fix for it then. > Before my patch we just always tried to switch it, but never threw an > error. Any progress with the patch? -- Ondrej Zary