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=-7.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 3C2BFECE58C for ; Mon, 14 Oct 2019 20:59:12 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (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 09CC221848 for ; Mon, 14 Oct 2019 20:59:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 09CC221848 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id ADAF019D5; Mon, 14 Oct 2019 20:59:11 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id B674319B7 for ; Mon, 14 Oct 2019 20:59:09 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 5A9C588E for ; Mon, 14 Oct 2019 20:59:09 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8A383337; Mon, 14 Oct 2019 13:59:08 -0700 (PDT) Received: from iMac-3.local (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BA5423F68E; Mon, 14 Oct 2019 13:59:06 -0700 (PDT) Date: Mon, 14 Oct 2019 21:59:00 +0100 From: Catalin Marinas To: Nicolas Saenz Julienne Subject: Re: [PATCH RFC 0/5] ARM: Raspberry Pi 4 DMA support Message-ID: <20191014205859.GA7634@iMac-3.local> References: <20191014183108.24804-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191014183108.24804-1-nsaenzjulienne@suse.de> User-Agent: Mutt/1.11.1 (2018-12-01) Cc: linux-s390@vger.kernel.org, f.fainelli@gmail.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, mbrugger@suse.com, bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Robin Murphy , linux-arm-kernel@lists.infradead.org, wahrenst@gmx.net X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 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 Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On Mon, Oct 14, 2019 at 08:31:02PM +0200, Nicolas Saenz Julienne wrote: > the Raspberry Pi 4 offers up to 4GB of memory, of which only the first > is DMA capable device wide. This forces us to use of bounce buffers, > which are currently not very well supported by ARM's custom DMA ops. > Among other things the current mechanism (see dmabounce.c) isn't > suitable for high memory. Instead of fixing it, this series introduces a > way of selecting dma-direct as the default DMA ops provider which allows > for the Raspberry Pi to make use of swiotlb. I presume these patches go on top of this series: http://lkml.kernel.org/r/20190911182546.17094-1-nsaenzjulienne@suse.de which I queued here: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=for-next/zone-dma -- Catalin _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu