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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 DD13EC433E2 for ; Thu, 17 Sep 2020 17:53:43 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 85872206C3 for ; Thu, 17 Sep 2020 17:53:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 85872206C3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=amd-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D13D36E2D7; Thu, 17 Sep 2020 17:53:42 +0000 (UTC) Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by gabe.freedesktop.org (Postfix) with ESMTPS id 45A6F6EC61; Thu, 17 Sep 2020 17:27:20 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 1123B6736F; Thu, 17 Sep 2020 19:27:16 +0200 (CEST) Date: Thu, 17 Sep 2020 19:27:15 +0200 From: Christoph Hellwig To: Alex Deucher Subject: Re: [PATCH] Revert "drm/radeon: handle PCIe root ports with addressing limitations" Message-ID: <20200917172715.GA8325@lst.de> References: <20200915184607.84435-1-alexander.deucher@amd.com> <20200916070436.GA9392@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-Mailman-Approved-At: Thu, 17 Sep 2020 17:53:41 +0000 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: amd-gfx list , "for 3.8" , Christian Koenig , Maling list - DRI developers , Alex Deucher , Christoph Hellwig Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" On Wed, Sep 16, 2020 at 06:16:25PM -0400, Alex Deucher wrote: > On Wed, Sep 16, 2020 at 3:04 AM Christoph Hellwig wrote: > > > > On Tue, Sep 15, 2020 at 02:46:07PM -0400, Alex Deucher wrote: > > > This change breaks tons of systems. > > > > Did you do at least some basic root causing on why? Do GPUs get > > fed address they can't deal with? Any examples? > > > > Bug 1 doesn't seem to contain any analysis and was reported against > > a very old kernel that had all kind of fixes since. > > > > Bug 2 seems to imply a drm kthread is accessing some structure it > > shouldn't, which would imply a mismatch between pools used by radeon > > now and those actually provided by the core. Something that should > > be pretty to trivial to fix for someone understanding the whole ttm > > pool maze. > > > > Bug 3: same as 1, but an even older kernel. > > > > Bug 4: looks like 1 and 3, and actually verified to work properly > > in 5.9-rc. Did you try to get the other reporters test this as well? > > It would appear that the change in 5.9 to disable AGP on radeon fixed > the issue. I'm following up on the other tickets to see if I can get > confirmation. On another thread[1], the user was able to avoid the > issue by disabling HIMEM. Looks like some issue with HIMEM and/or > AGP. Thanks. I'll try to spend some time to figure out what could be highmem related. I'd much rather get this fixed properly. _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx