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 48C98C433FE for ; Tue, 14 Sep 2021 15:30:57 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 EC2A461157 for ; Tue, 14 Sep 2021 15:30:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org EC2A461157 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.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id B4889402F7; Tue, 14 Sep 2021 15:30:56 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id X6yga_IM4SE8; Tue, 14 Sep 2021 15:30:56 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTPS id C1CAD401E6; Tue, 14 Sep 2021 15:30:55 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 90EB1C0011; Tue, 14 Sep 2021 15:30:55 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 23EA0C000D for ; Tue, 14 Sep 2021 15:30:54 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 127C56061A for ; Tue, 14 Sep 2021 15:30:54 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1k9l4sfQmzRT for ; Tue, 14 Sep 2021 15:30:53 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by smtp3.osuosl.org (Postfix) with ESMTPS id 2F8E86059A for ; Tue, 14 Sep 2021 15:30:52 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 375B567373; Tue, 14 Sep 2021 17:30:47 +0200 (CEST) Date: Tue, 14 Sep 2021 17:30:46 +0200 From: Christoph Hellwig To: Jan Beulich Subject: Re: [PATCH] swiotlb: set IO TLB segment size via cmdline Message-ID: <20210914153046.GB815@lst.de> References: <20210914151016.3174924-1-Roman_Skakun@epam.com> <7c04db79-7de1-93ff-0908-9bad60a287b9@suse.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <7c04db79-7de1-93ff-0908-9bad60a287b9@suse.com> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: Roman Skakun , linux-doc@vger.kernel.org, Peter Zijlstra , Viresh Kumar , linux-kernel@vger.kernel.org, Paul Mackerras , Will Deacon , Boris Ostrovsky , Stefano Stabellini , Jonathan Corbet , Michael Ellerman , Christoph Hellwig , Benjamin Herrenschmidt , 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@lists.linux-foundation.org, Roman Skakun , Andrew Morton , Robin Murphy , Mike Rapoport , "Maciej W. Rozycki" X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Tue, Sep 14, 2021 at 05:29:07PM +0200, Jan Beulich wrote: > I'm not convinced the swiotlb use describe there falls under "intended > use" - mapping a 1280x720 framebuffer in a single chunk? (As an aside, > the bottom of this page is also confusing, as following "Then we can > confirm the modified swiotlb size in the boot log:" there is a log > fragment showing the same original size of 64Mb. It doesn't. We also do not add hacks to the kernel for whacky out of tree modules. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu