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, 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 DBDA0C4332F for ; Wed, 15 Sep 2021 13:53:55 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 398F361250 for ; Wed, 15 Sep 2021 13:53:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 398F361250 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4H8hX16m87z308V for ; Wed, 15 Sep 2021 23:53:53 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lst.de (client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver=) Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4H8hWX1TYTz2yJX for ; Wed, 15 Sep 2021 23:53:27 +1000 (AEST) Received: by verein.lst.de (Postfix, from userid 2407) id AC35C67357; Wed, 15 Sep 2021 15:53:21 +0200 (CEST) Date: Wed, 15 Sep 2021 15:53:21 +0200 From: Christoph Hellwig To: Jan Beulich Subject: Re: [PATCH] swiotlb: set IO TLB segment size via cmdline Message-ID: <20210915135321.GA15216@lst.de> References: <20210914151016.3174924-1-Roman_Skakun@epam.com> <7c04db79-7de1-93ff-0908-9bad60a287b9@suse.com> <84ef7ff7-2c9c-113a-4a2c-cef54a6ded51@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <84ef7ff7-2c9c-113a-4a2c-cef54a6ded51@suse.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Roman Skakun , linux-doc@vger.kernel.org, Peter Zijlstra , Viresh Kumar , Linux Kernel Mailing List , Paul Mackerras , Will Deacon , Boris Ostrovsky , Marek Szyprowski , Stefano Stabellini , Jonathan Corbet , Christoph Hellwig , xen-devel@lists.xenproject.org, "Paul E. McKenney" , Konrad Rzeszutek Wilk , Muchun Song , Thomas Gleixner , Juergen Gross , Thomas Bogendoerfer , Andrii Anisov , linuxppc-dev@lists.ozlabs.org, Randy Dunlap , linux-mips@vger.kernel.org, iommu , Roman Skakun , Andrew Morton , Lu Baolu , Robin Murphy , Mike Rapoport , "Maciej W. Rozycki" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, Sep 15, 2021 at 03:49:52PM +0200, Jan Beulich wrote: > But the question remains: Why does the framebuffer need to be mapped > in a single giant chunk? More importantly: if you use dynamic dma mappings for your framebuffer you're doing something wrong.