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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 5A74BC33C9E for ; Wed, 8 Jan 2020 09:16:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 288CE2070E for ; Wed, 8 Jan 2020 09:16:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578475014; bh=+IAbT80Thjb7cm6WAP8wRkhDBitTa05E7byZ57Le5ag=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=A9zFJAycCuhQpi0IE0x6GsZj/EoLiml8kf95yLSLp0hulxolXTK8wJoATd9YCfJqR Z9PpJTxcPkVBCv8CDyku1f6AhvY4nN6WjcL1Z77GMNMMur8OKDlWJduUN3TKzDGwzQ zJQaYI28ZItf/9zzv4Ev6gLUCE3f5v8fnfAn5E58= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727512AbgAHJQx (ORCPT ); Wed, 8 Jan 2020 04:16:53 -0500 Received: from mail.kernel.org ([198.145.29.99]:46506 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727205AbgAHJQx (ORCPT ); Wed, 8 Jan 2020 04:16:53 -0500 Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C672C20705; Wed, 8 Jan 2020 09:16:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578475012; bh=+IAbT80Thjb7cm6WAP8wRkhDBitTa05E7byZ57Le5ag=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ie6mnSQIZ0/Cmh6ez45IJInqQwaokWY9MDyBZqRTZNt5uTgXRFmVAd2hNSM9uN3ID y/12CJS7TUfkeqVSwEDmyPF/a5pSrE4SVd4XYt+znN6uP71KT5adACbICf8qRxpEXp AQXOt9SNrLgS1q631MX+fnpE/s46nKozLm/TcjSk= Date: Wed, 8 Jan 2020 09:16:42 +0000 From: Will Deacon To: Bjorn Andersson Cc: Robin Murphy , Joerg Roedel , linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Patrick Daly , Pratik Patel , Rob Clark , treding@nvidia.com Subject: Re: [PATCH 0/3] iommu/arm-smmu: Qualcomm bootsplash/efifb Message-ID: <20200108091641.GA15147@willie-the-truck> References: <20191226221709.3844244-1-bjorn.andersson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191226221709.3844244-1-bjorn.andersson@linaro.org> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 26, 2019 at 02:17:06PM -0800, Bjorn Andersson wrote: > These patches implements the stream mapping inheritance that's necessary in > order to not hit a security violation as the display hardware looses its stream > mapping during initialization of arm-smmu in various Qualcomm platforms. > > This was previously posted as an RFC [1], changes since then involves the > rebase and migration of the read-back code to the Qualcomm specific > implementation, the mapping is maintained indefinitely - to handle probe > deferring clients - and rewritten commit messages. I don't think we should solve this in a Qualcomm-specific manner. Please can you take a look at the proposal from Thierry [1] and see whether or not it works for you? Thanks, Will [1] https://lore.kernel.org/lkml/20191209150748.2471814-1-thierry.reding@gmail.com