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=-4.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 F419FC433B4 for ; Wed, 28 Apr 2021 05:51:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CF3D761418 for ; Wed, 28 Apr 2021 05:51:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229624AbhD1Fvt (ORCPT ); Wed, 28 Apr 2021 01:51:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229464AbhD1Fvt (ORCPT ); Wed, 28 Apr 2021 01:51:49 -0400 Received: from mail-lj1-x230.google.com (mail-lj1-x230.google.com [IPv6:2a00:1450:4864:20::230]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AEA83C061574; Tue, 27 Apr 2021 22:51:04 -0700 (PDT) Received: by mail-lj1-x230.google.com with SMTP id u20so70881403lja.13; Tue, 27 Apr 2021 22:51:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=WxSDWJBKubTe8n31Ne0qppIwGIo+P1mF3Vf38REuc2Y=; b=crelfWOqIYnCaWLEZuJNLVQ3Ex7ONPKeatjPyvp7rwx/wDvnF0Ue6WkHPxpGANlt5p h8YanZj7qT5r6/dawYQgHD+QwQWRlfhXKhGks5m3TmIFUSf9JgxW2QW7CdYlFpnrUjut Udhcn31rlOkuBIQ66W8rJ/WXrXUVdg7+YoU4smv3PpZ7WI6FAG3oaXE3SlqNwoH79gMf Ry1AuaesNOgUzERt3zbhwJX9iDSGYUBf/0MLSQJRERgkJy1a/QQpCE3vFGHCwn4ETyrx 66QApFr8V1sW4euyURXXNkiBms9A6KT7/9RwucLV3WTIQagKpuftroG6FfVRtpYxGpfo uATQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=WxSDWJBKubTe8n31Ne0qppIwGIo+P1mF3Vf38REuc2Y=; b=hkiFgN7BFIk+5veUGgbK+260LoyWrBG6TDAyjdxPeQW7K3WGw28npOLWXKJDchQ/Pi jitvTpCvbx0S+YFFJfastghF333Yqa4CBBY40zNu4Zc4kCcJnzKJsKjjYaX4lDEg3Oi7 wpgCe/94Vkjfml1SrgU5okdeQWlc0IdjDToiAy/x6fXTBp9vG+a7fgheGhX5ugcHro6N 9TaLYCURYqEghcSQ0Hf/lmJe2uJt0SvyEjXOv1pY6nZHbUZsTVu8yxt4ZAAVCSuCp/QF XygxIvRkslipaNe2dsS20GIugulI4UrwRIebcZhYhTiaexC1p/8DgR+en+Tk6e5Uu7cK PCvQ== X-Gm-Message-State: AOAM533xIhHmbHbNgptbsQoD1N++RYVBlvKA5pIhLsGJNoOzK6w/lxlo fZGUutmt8kaORP4p42Sm0Xo/NXbkXkQ= X-Google-Smtp-Source: ABdhPJwuAJK4aFYajohCA0T5i71uWmaClgd0xYfxsrAdmww9qbx9226OHVGHhTgkF5PAvkBApg8pLA== X-Received: by 2002:a2e:b0c9:: with SMTP id g9mr19071704ljl.500.1619589062803; Tue, 27 Apr 2021 22:51:02 -0700 (PDT) Received: from [192.168.2.145] (109-252-193-102.dynamic.spd-mgts.ru. [109.252.193.102]) by smtp.googlemail.com with ESMTPSA id g9sm462878lfv.120.2021.04.27.22.51.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Apr 2021 22:51:02 -0700 (PDT) Subject: Re: [PATCH v2 0/5] iommu: Support identity mappings of reserved-memory regions To: Thierry Reding , Joerg Roedel , Rob Herring Cc: Will Deacon , Robin Murphy , Nicolin Chen , Krishna Reddy , devicetree@vger.kernel.org, iommu@lists.linux-foundation.org, linux-tegra@vger.kernel.org References: <20210423163234.3651547-1-thierry.reding@gmail.com> From: Dmitry Osipenko Message-ID: Date: Wed, 28 Apr 2021 08:51:01 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210423163234.3651547-1-thierry.reding@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 23.04.2021 19:32, Thierry Reding пишет: > Note that there will be no new releases of the bootloader for earlier > devices, so adding support for these new DT bindings will not be > practical. The bootloaders on those devices do pass information about > the active framebuffer via the kernel command-line, so we may want to > add code to create reserved regions in the IOMMU based on that. Since this change requires a bootloader update anyways, why it's not possible to fix the bootloader properly, making it to stop all the DMA activity before jumping into kernel?