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_PASS,URIBL_BLOCKED,USER_AGENT_MUTT 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 CE182C71123 for ; Sun, 14 Oct 2018 08:14:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9CFD620876 for ; Sun, 14 Oct 2018 08:14:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9CFD620876 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726499AbeJNPy5 (ORCPT ); Sun, 14 Oct 2018 11:54:57 -0400 Received: from verein.lst.de ([213.95.11.211]:33878 "EHLO newverein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726115AbeJNPy5 (ORCPT ); Sun, 14 Oct 2018 11:54:57 -0400 Received: by newverein.lst.de (Postfix, from userid 2407) id B37CE68C73; Sun, 14 Oct 2018 10:14:43 +0200 (CEST) Date: Sun, 14 Oct 2018 10:14:43 +0200 From: Christoph Hellwig To: Thomas Gleixner Cc: Christoph Hellwig , x86@kernel.org, tedheadster@gmail.com, konrad.wilk@oracle.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86: enable swiotlb for > 4GiG ram on 32-bit kernels Message-ID: <20181014081443.GA17889@lst.de> References: <20181014075208.2715-1-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Oct 14, 2018 at 10:13:31AM +0200, Thomas Gleixner wrote: > On Sun, 14 Oct 2018, Christoph Hellwig wrote: > > > We already build the swiotlb code for 32b-t kernels with PAE support, > > but the code to actually use swiotlb has only been enabled for 64-bit > > kernel for an unknown reason. > > > > Before Linux 4.18 we papers over this fact because the networking code, > > the scsi layer and some random block drivers implenented their own > > bounce buffering scheme. > > > > Fixes: 21e07dba ("scsi: reduce use of block bounce buffers") > > Fixes: ab74cfeb ("net: remove the PCI_DMA_BUS_IS_PHYS check in illegal_highdma") > > Reported-by: tedheadster > > Tested-by: tedheadster > > I'll add your SOB when picking this up :) Thanks. Here it is in writing: Signed-off-by: Christoph Hellwig From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH] x86: enable swiotlb for > 4GiG ram on 32-bit kernels Date: Sun, 14 Oct 2018 10:14:43 +0200 Message-ID: <20181014081443.GA17889@lst.de> References: <20181014075208.2715-1-hch@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Thomas Gleixner Cc: konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, tedheadster-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Christoph Hellwig List-Id: iommu@lists.linux-foundation.org On Sun, Oct 14, 2018 at 10:13:31AM +0200, Thomas Gleixner wrote: > On Sun, 14 Oct 2018, Christoph Hellwig wrote: > > > We already build the swiotlb code for 32b-t kernels with PAE support, > > but the code to actually use swiotlb has only been enabled for 64-bit > > kernel for an unknown reason. > > > > Before Linux 4.18 we papers over this fact because the networking code, > > the scsi layer and some random block drivers implenented their own > > bounce buffering scheme. > > > > Fixes: 21e07dba ("scsi: reduce use of block bounce buffers") > > Fixes: ab74cfeb ("net: remove the PCI_DMA_BUS_IS_PHYS check in illegal_highdma") > > Reported-by: tedheadster > > Tested-by: tedheadster > > I'll add your SOB when picking this up :) Thanks. Here it is in writing: Signed-off-by: Christoph Hellwig