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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 235D9C531FF for ; Fri, 20 Feb 2026 10:25:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D4A1210E010; Fri, 20 Feb 2026 10:25:35 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="LkZKHCEE"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) by gabe.freedesktop.org (Postfix) with ESMTPS id BC81610E010 for ; Fri, 20 Feb 2026 10:25:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1771583135; x=1803119135; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=N8MntAP/70DB66jYBekqkQscAfasJwXQLCGTdLeSAPk=; b=LkZKHCEEeuDC61F/CXm/4quNGeG1zJjLCmXpc+Y2nLRvqRrv6h2djEc9 HMbvcHFqJ0V5wpOrNlDr+8L//RgZxC6HdBd2TYIKMZxFY1YdPfrjV3lJx AV402JoI6ZsIyrNW13ebyoXXtLni0HoyTZpnmBKnmZlwjmn5mELGiybIr jL6xxyQTNnYXC3CrsIBMAcfaeTL/pGXkl5ChfLttKpCcmx15MBrXo99Vf mKkjntDKLD/wLLY1HdtwJLgsxQXRBSqJwvgViDWNr8ufjNVDUAB6hLMfy LDLWLbOZNic0dEzQigsMKP+J89eRZCCcl5j/3K3mpNY2LtUL+SVtSYe+L g==; X-CSE-ConnectionGUID: YxDnYwsRSCGM1K0OxM+bbw== X-CSE-MsgGUID: liUV54KfRn6W259lexuPRw== X-IronPort-AV: E=McAfee;i="6800,10657,11706"; a="72659704" X-IronPort-AV: E=Sophos;i="6.21,301,1763452800"; d="scan'208";a="72659704" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Feb 2026 02:25:35 -0800 X-CSE-ConnectionGUID: ltF25NoKQm67zh9coroaOw== X-CSE-MsgGUID: XdhtJDbjS6iBXJ08u/0LqA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,301,1763452800"; d="scan'208";a="219361569" Received: from fpallare-mobl4.ger.corp.intel.com (HELO [10.245.245.77]) ([10.245.245.77]) by fmviesa005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Feb 2026 02:25:33 -0800 Message-ID: <0863281d-9e3d-48ba-89e3-3503c98407cd@intel.com> Date: Fri, 20 Feb 2026 10:25:31 +0000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V3 2/4] drm/xe/pat: define coh_mode 2way To: Tejas Upadhyay , intel-xe@lists.freedesktop.org Cc: thomas.hellstrom@linux.intel.com References: <20260220101638.1609775-6-tejas.upadhyay@intel.com> <20260220101638.1609775-8-tejas.upadhyay@intel.com> Content-Language: en-GB From: Matthew Auld In-Reply-To: <20260220101638.1609775-8-tejas.upadhyay@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" On 20/02/2026 10:16, Tejas Upadhyay wrote: > Defining 2way (two-way coherency) is critical for > Xe3p_LPG (Nova Lake P) platforms to support L2 flush > optimization safely. > > This mode allows the driver to skip certain manual cache > flushes (L2 flush optimization) without risking memory > corruption because the hardware ensures the most recent > data is visible to both entities. > > Signed-off-by: Tejas Upadhyay Reviewed-by: Matthew Auld