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=-5.3 required=3.0 tests=BAYES_00,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 735F9C433DF for ; Mon, 12 Oct 2020 06:48:49 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 F422C206B5 for ; Mon, 12 Oct 2020 06:48:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="IyRwkPwv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F422C206B5 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+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=merlin.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=Gw00RFiGXMk/cL/EHKf1ggeqs5jB40rYkwHfWT4O8r0=; b=IyRwkPwvlX2/J3aUw4DWeO7v0 rr10Imgk81jBPj5lD1DrizxgaVr/b7hZYsuvjcg96P7ahfBW5zPT4hg9ZHQPAnteDsI7sWKwQV0dD 2w+PdZu1l/kok9NpjhMaZWkyq14mi/F9VpKb5F6fZnKnEgDclT56EHRO+JikX+6g4GWWF9Cz4e7C1 pN++dfOicfTs7+QXxnxqoIj2+ggKb1wqXZc/f4lbyO8ENz7jgCWUGDulT1SoUwvIMzI7Qxoxoui1t GOFh7pmILaJUGESfi8CwrT7xlb1s6siFSkLHxJ0YaMTjy6kKpfoXn6A9bKMwjtXoS2aZ7v3bnn+EC XIyu30A/Q==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kRrcC-00083q-Pn; Mon, 12 Oct 2020 06:47:24 +0000 Received: from verein.lst.de ([213.95.11.211]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kRrcA-00082g-05; Mon, 12 Oct 2020 06:47:22 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 0B4B967373; Mon, 12 Oct 2020 08:47:16 +0200 (CEST) Date: Mon, 12 Oct 2020 08:47:15 +0200 From: Christoph Hellwig To: Catalin Marinas Subject: Re: [PATCH 1/4] of/fdt: Update zone_dma_bits when running in bcm2711 Message-ID: <20201012064715.GA2548@lst.de> References: <20201002115541.GC7034@gaia> <12f33d487eabd626db4c07ded5a1447795eed355.camel@suse.de> <20201009071013.GA12208@lst.de> <513833810c15b5efeab7c3cbae1963a78c71a79f.camel@suse.de> <20201009152433.GA19953@e121166-lin.cambridge.arm.com> <20201009171051.GL23638@gaia> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201009171051.GL23638@gaia> 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-20201012_024722_185082_670DE333 X-CRM114-Status: GOOD ( 11.60 ) 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: Linux ARM , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , Lorenzo Pieralisi , Frank Rowand , Linux Kernel Mailing List , Christoph Hellwig , Linux Memory Management List , iommu@lists.linux-foundation.org, Rob Herring , linux-rpi-kernel@lists.infradead.org, Will Deacon , Ard Biesheuvel , Nicolas Saenz Julienne , Robin Murphy Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Oct 09, 2020 at 06:10:52PM +0100, Catalin Marinas wrote: > kdump wants DMA-able memory and, DMAable by whom? The only way to guranteed DMAable memory is to use the DMA memory allocator(s) and pass a specific device to them. Everyting else is just fundamentally broken. Note that even when device is not DMAable we can still use swiotlb to access it. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel