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=-2.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 AF43AC76195 for ; Thu, 18 Jul 2019 09:15:37 +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 8518D217F4 for ; Thu, 18 Jul 2019 09:15:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="q9wcC7oE" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8518D217F4 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=JAOAcesgokJsvHGIQ8uv7eY9L8VezlX0ClmY5k5QMfQ=; b=q9wcC7oE/l+w/R vNvr+WfQjWgwp6dpb/SKnJgWIGRu5WUm5NwRDcsWpRmemq1Ln7xZ8LLC34e0awgb2Ubz6iF/tcs3S FVpMzrIzCcWZwv11v99rSjmhTnk4PnHuKvrkVB/RiuFrRPMV5Ibzx48ES/9DyRkNHgsb3n0u3WR5I BtckvESHPh9PH2lXlWNP+JiQktgNGogm6mbpgE0KIJl7kZ5f73rngn1yVj/ULH8CS79g6vkAcYZFM Ch7jhkwGqaeZ5wyDWeGffU5c3ah3irD5qfJplhSsyOJ5ak4RskRLuiTb8AMZ2uZd7sKV2QM8umF1m 8bGK+dC+fSYGeRoHvSMQ==; 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 1ho2Vh-0005gJ-7f; Thu, 18 Jul 2019 09:15:33 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1ho2Vd-0005aR-1t for linux-arm-kernel@lists.infradead.org; Thu, 18 Jul 2019 09:15:30 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 5018A68B05; Thu, 18 Jul 2019 11:15:26 +0200 (CEST) Date: Thu, 18 Jul 2019 11:15:26 +0200 From: Christoph Hellwig To: Nicolas Saenz Julienne Subject: Re: [RFC 3/4] dma-direct: add dma_direct_min_mask Message-ID: <20190718091526.GA25321@lst.de> References: <20190717153135.15507-1-nsaenzjulienne@suse.de> <20190717153135.15507-4-nsaenzjulienne@suse.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190717153135.15507-4-nsaenzjulienne@suse.de> 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-20190718_021529_252989_32395209 X-CRM114-Status: UNSURE ( 9.44 ) 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: stefan.wahren@i2se.com, f.fainelli@gmail.com, catalin.marinas@arm.com, phil@raspberrypi.org, Robin Murphy , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Jisheng.Zhang@synaptics.com, mbrugger@suse.com, will@kernel.org, Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Marek Szyprowski 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 17, 2019 at 05:31:34PM +0200, Nicolas Saenz Julienne wrote: > Historically devices with ZONE_DMA32 have been assumed to be able to > address at least the lower 4GB of ram for DMA. This is still the defualt > behavior yet the Raspberry Pi 4 is limited to the first GB of memory. > This has been observed to trigger failures in dma_direct_supported() as > the 'min_mask' isn't properly set. > > We create 'dma_direct_min_mask' in order for the arch init code to be > able to fine-tune dma direct's 'min_dma' mask. Normally we use ZONE_DMA for that case. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel