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 ED521C43603 for ; Wed, 4 Dec 2019 13:56:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id ABFE62077B for ; Wed, 4 Dec 2019 13:56:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ABFE62077B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5602A6B0AE3; Wed, 4 Dec 2019 08:56:37 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 510A96B0AE4; Wed, 4 Dec 2019 08:56:37 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 427896B0AE5; Wed, 4 Dec 2019 08:56:37 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0063.hostedemail.com [216.40.44.63]) by kanga.kvack.org (Postfix) with ESMTP id 2DD606B0AE3 for ; Wed, 4 Dec 2019 08:56:37 -0500 (EST) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id E93BC499613 for ; Wed, 4 Dec 2019 13:56:36 +0000 (UTC) X-FDA: 76227609192.13.spark31_73e5f8be3e353 X-HE-Tag: spark31_73e5f8be3e353 X-Filterd-Recvd-Size: 2112 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf09.hostedemail.com (Postfix) with ESMTP for ; Wed, 4 Dec 2019 13:56:36 +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 Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Mike Rapoport , Christian Zigotzky , Benjamin Herrenschmidt , Christoph Hellwig , Darren Stevens , mad skateman , Michael Ellerman , Nicolas Saenz Julienne , Paul Mackerras , Robin Murphy , Rob Herring 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-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191204123524.22919-1-rppt@kernel.org> User-Agent: Mutt/1.5.17 (2007-11-01) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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