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=-5.2 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 E1D57C2D0A8 for ; Wed, 30 Sep 2020 05:10:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 98C9420789 for ; Wed, 30 Sep 2020 05:10:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="JEKFiD9I" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725440AbgI3FKF (ORCPT ); Wed, 30 Sep 2020 01:10:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59780 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725320AbgI3FKE (ORCPT ); Wed, 30 Sep 2020 01:10:04 -0400 Received: from mail-lf1-x143.google.com (mail-lf1-x143.google.com [IPv6:2a00:1450:4864:20::143]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C2B6FC061755; Tue, 29 Sep 2020 22:10:03 -0700 (PDT) Received: by mail-lf1-x143.google.com with SMTP id u8so581063lff.1; Tue, 29 Sep 2020 22:10:03 -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=cEH+zGuhb7boZPnK+5qwlskD7dzNXbs2N7hqt0FYXtI=; b=JEKFiD9IhMc0d2BR62xEDLkwxPUNZ5O5AdjXzgRfQBoaNRDPyAaOzVSksh5qzthbOn cYaL2EEnInhh9d9qCI/VzTHM1UAFrtLeelC6pPjdHatdMhlXKjkbIwO7k0//RsZkRsjS 423U++/3789kQEX1LWZcA5NE/DgIeZJI+acgQJ9GYvKAG4XiCcvjr/EDmHXnhenbvhwx tuH8F9P/YTm19nRrmsNVTDY6ylX+zAyu5FzeFSHMQ0xbRSvwdp3IfcWatk/brX3Rh49h ptCq5FurX26gGHPZHjo9Rvr1ERKApIQju9F9KmmigUZ9gY3kmkYyPPHkqXtglU0jw/ww +Fsg== 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=cEH+zGuhb7boZPnK+5qwlskD7dzNXbs2N7hqt0FYXtI=; b=WjX9P8Z0UwYDVMSCc7211iHSboENiwIpjR6AqZ7acdesEvUohqEc43a9LITZ/5d2N6 URZvI1vKDtzntx0bmT3HrWNAa/Sg7Nn2x9XaNpniRc9rnozsj3CgI3+R2BPuL2DWazFm b9/MpjAtgZRHDa42DSU4FCFOXeSE0+wPWREkRBYvtvE6YjE/bccLNspa1IQlVR7VyaPZ Kkr4v6JjCWK3bvA9Nwr4jKolEMApqODKIskris1pdNbx26VFwwFJ4kP0dTfTIGjQgPoW SYx7L2twQXiV5VPyfNYBaO8O6g4DLgtCex0BE3Xuf8dCOrCcESq77XFOOHt2QRlC2uwH msZw== X-Gm-Message-State: AOAM532cI/Swnz8r4ar17ONqjtIXPfPbFxa/rlEr8/2EecFPDAVhNR4t eo3KGY3Q+QgfOxnmu9EghmVqqxZYkO8= X-Google-Smtp-Source: ABdhPJyOrfcyT8AJjKsE9UZTICu54D13qTLp0F9P1YPzBCvcB7eAm/HnfeYg1e2/Xa+QzTIeCRVeNA== X-Received: by 2002:a19:8bc2:: with SMTP id n185mr211884lfd.211.1601442601966; Tue, 29 Sep 2020 22:10:01 -0700 (PDT) Received: from [192.168.2.145] (109-252-170-211.dynamic.spd-mgts.ru. [109.252.170.211]) by smtp.googlemail.com with ESMTPSA id v196sm54763lfa.96.2020.09.29.22.10.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 29 Sep 2020 22:10:00 -0700 (PDT) Subject: Re: [PATCH v2 3/3] iommu/tegra-smmu: Add PCI support To: Nicolin Chen , thierry.reding@gmail.com, joro@8bytes.org, krzk@kernel.org Cc: vdumpa@nvidia.com, jonathanh@nvidia.com, linux-tegra@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <20200930003013.31289-1-nicoleotsuka@gmail.com> <20200930003013.31289-4-nicoleotsuka@gmail.com> From: Dmitry Osipenko Message-ID: <27b155ec-97ab-98f6-7b48-3fded875d5cc@gmail.com> Date: Wed, 30 Sep 2020 08:10:00 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200930003013.31289-4-nicoleotsuka@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org 30.09.2020 03:30, Nicolin Chen пишет: ... > +#ifdef CONFIG_PCI > + if (!iommu_present(&pci_bus_type)) { Could you please explain why this check is needed?