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=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 8B6C1C2BD09 for ; Wed, 4 Dec 2019 13:56:41 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (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 5DD902073C for ; Wed, 4 Dec 2019 13:56:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5DD902073C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 27E8087C74; Wed, 4 Dec 2019 13:56:41 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DxkFana5oV2t; Wed, 4 Dec 2019 13:56:39 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id E425787C65; Wed, 4 Dec 2019 13:56:39 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id D8C43C18DD; Wed, 4 Dec 2019 13:56:39 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 91C5BC077D for ; Wed, 4 Dec 2019 13:56:38 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 7FA3386BCF for ; Wed, 4 Dec 2019 13:56:38 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EyMSQErWhFTT for ; Wed, 4 Dec 2019 13:56:37 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by fraxinus.osuosl.org (Postfix) with ESMTPS id 3584F86AD1 for ; Wed, 4 Dec 2019 13:56:37 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 95DA468BFE; Wed, 4 Dec 2019 14:56:32 +0100 (CET) Date: Wed, 4 Dec 2019 14:56:32 +0100 From: Christoph Hellwig To: Mike Rapoport Subject: Re: [PATCH] powerpc: ensure that swiotlb buffer is allocated from low memory Message-ID: <20191204135632.GA31262@lst.de> References: <20191204123524.22919-1-rppt@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191204123524.22919-1-rppt@kernel.org> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: linux-arch@vger.kernel.org, Darren Stevens , Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, Mike Rapoport , linux-mm@kvack.org, iommu@lists.linux-foundation.org, Rob Herring , Paul Mackerras , Michael Ellerman , mad skateman , Christian Zigotzky , linuxppc-dev@lists.ozlabs.org, Christoph Hellwig , Nicolas Saenz Julienne , Robin Murphy 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 Wed, Dec 04, 2019 at 02:35:24PM +0200, Mike Rapoport wrote: > From: Mike Rapoport > > Some powerpc platforms (e.g. 85xx) limit DMA-able memory way below 4G. If a > system has more physical memory than this limit, the swiotlb buffer is not > addressable because it is allocated from memblock using top-down mode. > > Force memblock to bottom-up mode before calling swiotlb_init() to ensure > that the swiotlb buffer is DMA-able. > > Link: https://lkml.kernel.org/r/F1EBB706-73DF-430E-9020-C214EC8ED5DA@xenosoft.de > Reported-by: Christian Zigotzky > Signed-off-by: Mike Rapoport Looks good: Reviewed-by: Christoph Hellwig _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu