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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 2C5CDC4338F for ; Wed, 18 Aug 2021 14:55:28 +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 E9608610D2 for ; Wed, 18 Aug 2021 14:55:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E9608610D2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5C7736E910; Wed, 18 Aug 2021 14:55:27 +0000 (UTC) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2C9C86E910 for ; Wed, 18 Aug 2021 14:55:26 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10080"; a="238440164" X-IronPort-AV: E=Sophos;i="5.84,330,1620716400"; d="scan'208";a="238440164" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2021 07:55:25 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,330,1620716400"; d="scan'208";a="521081515" Received: from stinkbox.fi.intel.com (HELO stinkbox) ([10.237.72.171]) by FMSMGA003.fm.intel.com with SMTP; 18 Aug 2021 07:55:22 -0700 Received: by stinkbox (sSMTP sendmail emulation); Wed, 18 Aug 2021 17:55:21 +0300 Date: Wed, 18 Aug 2021 17:55:21 +0300 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: =?iso-8859-1?Q?Jos=E9?= Roberto de Souza Cc: intel-gfx@lists.freedesktop.org, Daniel Vetter , Gwan-gyeong Mun , Jani Nikula , Rodrigo Vivi Message-ID: References: <20210818004216.220279-1-jose.souza@intel.com> <20210818004216.220279-8-jose.souza@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20210818004216.220279-8-jose.souza@intel.com> X-Patchwork-Hint: comment Subject: Re: [Intel-gfx] [PATCH 7/8] drm/i915/display/skl+: Drop frontbuffer rendering support X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Tue, Aug 17, 2021 at 05:42:15PM -0700, José Roberto de Souza wrote: > By now all the userspace applications should have migrated to atomic > or at least be calling DRM_IOCTL_MODE_DIRTYFB. > > With that we can kill frontbuffer rendering support in i915 for > modern platforms. > > So here converting legacy APIs into atomic commits so it can be > properly handled by driver i915. > > Several IGT tests will fail with this changes, because some tests > were stressing those frontbuffer rendering scenarios that no userspace > should be using by now, fixes to IGT should be sent soon. Blocking atomic commits instead of the current lightweight frontbuffer interface sounds like a terrible plan. How unusable is X with this approach? -- Ville Syrjälä Intel