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=-4.2 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,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 27382C433EF for ; Tue, 14 Sep 2021 18:57:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0E9A36113B for ; Tue, 14 Sep 2021 18:57:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232267AbhINS6p (ORCPT ); Tue, 14 Sep 2021 14:58:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229728AbhINS6n (ORCPT ); Tue, 14 Sep 2021 14:58:43 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 56FD3C061574; Tue, 14 Sep 2021 11:57:26 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id f21so6651861plb.4; Tue, 14 Sep 2021 11:57:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to :user-agent; bh=g2+loS70cSgdFxeOP/sRqiawauBWZZoV++pN8aeuNG4=; b=LiNspIrKHZ8lHoj51foc14YEVker+hYXD5WF7LtIW9JrAXaWxwNzMiZ7xZoVWbD56P MlFik++pPRVz1wMEMRg0xe0uhGUAVrFDWHIsl5zMK0v3OPiy9BPD8vIvB4rBSZDgwaKq 46NuEayBAIue4b0SSqeqACnyrYFZsCeiXF4+IUceZp71L8dOXKnnrCrHHDCc9NPJp3AL 8KhA1a0Gw4MSqKRZvyU9vcKv7FsJdQZ8vZxLCLxHxJm6nOYwgOeqrtO2pK5FkBCmhHVx PK1IE/dSrc8ZJG9VL6NT7kXko3iE9mZF7frY1a+63UCcRBror9iuqWugJdnwQBeLi7NZ sPTg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to:user-agent; bh=g2+loS70cSgdFxeOP/sRqiawauBWZZoV++pN8aeuNG4=; b=1viJGb0v20uQvxUbbApBRyEd2GoER1X5w7RI7lr9d10rEGTXsDxKLfa1Krwb76Mj2N xgYlP5/X+FuZnkzT/0LMdsrGnhMCckGJ3UnRm7XSMU88KiUJ3tDH9Rz10LMZm0C/Fguo wDsXnkyiL0E32rNEHW3gImwQAsTBWBvzp9CY8cpPv7OkVqRDvquni/j1fgPfWT2XDdhd +ucvdlEg6LQmFQM4vZfBby+TU7fdM5VH29fWqo/cdmL/rdVtD4+INxq5n7ZdKidWlq55 Jb8YQ3qq1I46NEI77TY9wchp/UsA5xbBd/FQjcNV64T1sUhWQ1R6Kk8NQwRMLAL0Rb6G nOBQ== X-Gm-Message-State: AOAM532zbqROIsV3Rem/5huNIpZujER6FCq/b/eo1+83OgoETwdpVyEG Iv3KhuWMkyYLlehLZuRzgsg= X-Google-Smtp-Source: ABdhPJxCnIRlsaQZc9Q4J3l7LWo55eKXeafd5utGpHYG1mnIrZXruWW/b6d7wLz5hFUBc4vE7exkkA== X-Received: by 2002:a17:90a:1984:: with SMTP id 4mr3788827pji.87.1631645845834; Tue, 14 Sep 2021 11:57:25 -0700 (PDT) Received: from Asurada-Nvidia (thunderhill.nvidia.com. [216.228.112.22]) by smtp.gmail.com with ESMTPSA id x15sm12057669pgt.34.2021.09.14.11.57.24 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 14 Sep 2021 11:57:25 -0700 (PDT) Date: Tue, 14 Sep 2021 11:49:34 -0700 From: Nicolin Chen To: Dmitry Osipenko Cc: thierry.reding@gmail.com, joro@8bytes.org, will@kernel.org, vdumpa@nvidia.com, jonathanh@nvidia.com, linux-tegra@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 6/6] iommu/tegra-smmu: Add pagetable mappings to debugfs Message-ID: <20210914184933.GA32705@Asurada-Nvidia> References: <20210914013858.31192-1-nicoleotsuka@gmail.com> <20210914013858.31192-7-nicoleotsuka@gmail.com> <31501a62-3312-9f04-3bb8-790d0481746c@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <31501a62-3312-9f04-3bb8-790d0481746c@gmail.com> User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Sep 14, 2021 at 04:29:15PM +0300, Dmitry Osipenko wrote: > 14.09.2021 04:38, Nicolin Chen пишет: > > +static unsigned long pd_pt_index_iova(unsigned int pd_index, unsigned int pt_index) > > +{ > > + return ((dma_addr_t)pd_index & (SMMU_NUM_PDE - 1)) << SMMU_PDE_SHIFT | > > + ((dma_addr_t)pt_index & (SMMU_NUM_PTE - 1)) << SMMU_PTE_SHIFT; > > +} > > We know that IOVA is fixed to u32 for this controller. Can we avoid all > these dma_addr_t castings? It should make code cleaner a tad, IMO. Tegra210 actually supports 34-bit IOVA...