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,NICE_REPLY_A,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 75E5FC04FF3 for ; Mon, 24 May 2021 12:48:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 58CD461360 for ; Mon, 24 May 2021 12:48:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232603AbhEXMuM (ORCPT ); Mon, 24 May 2021 08:50:12 -0400 Received: from foss.arm.com ([217.140.110.172]:41900 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232371AbhEXMuB (ORCPT ); Mon, 24 May 2021 08:50:01 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0B1B7113E; Mon, 24 May 2021 05:48:33 -0700 (PDT) Received: from [10.57.73.64] (unknown [10.57.73.64]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 43B153F719; Mon, 24 May 2021 05:48:31 -0700 (PDT) Subject: Re: [PATCH 0/3] iommu/arm-smmu: Qualcomm bootsplash/efifb To: Lee Jones , Will Deacon Cc: Bjorn Andersson , Joerg Roedel , linux-arm-kernel , iommu@lists.linux-foundation.org, open list , linux-arm-msm , Patrick Daly , Pratik Patel , Rob Clark , Thierry Reding References: <20191226221709.3844244-1-bjorn.andersson@linaro.org> <20200108091641.GA15147@willie-the-truck> From: Robin Murphy Message-ID: <1a93ede6-7af5-dbc8-f655-8b96afa4a277@arm.com> Date: Mon, 24 May 2021 13:48:25 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021-05-24 13:03, Lee Jones wrote: > On Wed, 8 Jan 2020 at 09:16, Will Deacon wrote: > >> 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? >> > > Did this or Thierry's solution ever gain traction? > > Or are all the parties still 'solving' this downstream? I think this particular series is what eventually ended up upstream as 07a7f2caaa5a and f9081b8ff593 (plus a couple of tweaks later). Progress is slow on the more general solution, but still happening - I see there was a new version recently which I've not had time to properly look at yet. Robin.