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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 E74DCC76186 for ; Wed, 24 Jul 2019 17:56:05 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 BE74C21852 for ; Wed, 24 Jul 2019 17:56:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="u0JevNZC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BE74C21852 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-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=obn7dNkyZnn9nlNBttMg2TUTa8jJfgZNiG2Q38LMMJE=; b=u0JevNZCMZ+KKl N3QT0jpTB/P985O4Uzdlcmj2r7jo/pxNZy1ACw2aEJAz3Kjz+zWZ3kfb0h4NjO4KNDwYKMChykC9B kRYyNmgavUB1m7FNDsHmMQByJGpuUdgG+OrjkBnzyLl61CUcpvIfPEP2/dYFoLFIwsjZRn8LpZfJ2 kNTUaCCwc6iPVWFIPhLnnxD41As0/j/sg8tWvSjQ5Pgy7IEQX2LgmlTy0gBMWP49TzvAWpxS4Bj4D yu7GdjiTHif5N5Eg/FD0x4ajbkQbJ23ArqkGlzeXkxi8c86iLpXccKCar3Zr5V2SLT/zzo96GOWPv IYtCmd7FG7/eBdBMATUQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hqLUb-0003fR-Th; Wed, 24 Jul 2019 17:55:57 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hqLUX-0003ed-Pu for linux-arm-kernel@lists.infradead.org; Wed, 24 Jul 2019 17:55:55 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 4813E68B20; Wed, 24 Jul 2019 19:55:51 +0200 (CEST) Date: Wed, 24 Jul 2019 19:55:51 +0200 From: Christoph Hellwig To: Nicolas Saenz Julienne Subject: Re: [PATCH 2/2] arm: use swiotlb for bounce buffer on LPAE configs Message-ID: <20190724175551.GA13073@lst.de> References: <20190709142011.24984-1-hch@lst.de> <20190709142011.24984-3-hch@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190724_105553_987496_BD503FA1 X-CRM114-Status: UNSURE ( 7.60 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vignesh Raghavendra , Konrad Rzeszutek Wilk , linux-kernel@vger.kernel.org, Russell King - ARM Linux admin , iommu@lists.linux-foundation.org, Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Roger Quadros Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jul 24, 2019 at 07:23:50PM +0200, Nicolas Saenz Julienne wrote: > Out of curiosity, what is the reason stopping us from using dma-direct/swiotlb > instead of arm_dma_ops altogether? Nothing fundamental. We just need to do a very careful piecemeal migration as the arm code handles a ot of interesting corner case and we need to ensure we don't break that. I have various WIP patches for the easier bits and we can work from there. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel