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 DD249C4167B for ; Mon, 6 Nov 2023 16:37:13 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4874D10E356; Mon, 6 Nov 2023 16:37:13 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5D14E10E356 for ; Mon, 6 Nov 2023 16:37:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1699288631; x=1730824631; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=lkFYKjRWlxwZmj7DMBN1tcd5xuHn/Jd2MiopPVF11hM=; b=gDtsXjzIfeHj5SghszC91qZByfP7LazYbQ0rxOhIfUY8366Zo4RrA/Gb eZbStZSyf9KSDDvyINYYPOLvVsG/QypFrKcNi0gdLlmpGTr27LZuuqFeo 4wcCLxdIf81yLlMIDuXOnqdvEPxPuEdJDSf91aY7o9eStUMuhY9WmwthC wkuicTaa+LSTiwqd/iZualNBNSbo9KZaBObVnDyWCc2cdhcvsqiIWoRFD /uUSikTRE4FC8j8wTa114aVHRIfBWGeOkEDfS1UxNaI3RIFMGE5q9g/aV H1oSgVP/kcSFh5paIIBO45QTbYEPO6fxr5sytbQqFTyVGerdod/9lLIDl w==; X-IronPort-AV: E=McAfee;i="6600,9927,10886"; a="379706109" X-IronPort-AV: E=Sophos;i="6.03,282,1694761200"; d="scan'208";a="379706109" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Nov 2023 08:37:10 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10886"; a="828277852" X-IronPort-AV: E=Sophos;i="6.03,282,1694761200"; d="scan'208";a="828277852" Received: from astrano-mobl2.ger.corp.intel.com (HELO intel.com) ([10.249.43.34]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Nov 2023 08:37:07 -0800 Date: Mon, 6 Nov 2023 17:37:05 +0100 From: Andi Shyti To: Jonathan Cavitt Message-ID: References: <20231102175831.872763-1-jonathan.cavitt@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20231102175831.872763-1-jonathan.cavitt@intel.com> Subject: Re: [Intel-gfx] [PATCH] drm/i915/gt: Temporarily disable CPU caching into DMA for MTL 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: , Cc: saurabhg.gupta@intel.com, intel-gfx@lists.freedesktop.org, chris.p.wilson@linux.intel.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Hi Jonathan, On Thu, Nov 02, 2023 at 10:58:31AM -0700, Jonathan Cavitt wrote: > FIXME: It is suspected that some Address Translation Service (ATS) > issue on IOMMU is causing CAT errors to occur on some MTL workloads. > Applying a write barrier to the ppgtt set entry functions appeared > to have no effect, so we must temporarily use I915_MAP_WC in the > map_pt_dma class of functions on MTL until a proper ATS solution is > found. > > Signed-off-by: Jonathan Cavitt > CC: Chris Wilson acked and pushed! Thanks! Andi