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 522DEC3A59E for ; Mon, 26 Aug 2019 07:09:52 +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 2536820874 for ; Mon, 26 Aug 2019 07:09:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="N4Sv1Jg1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2536820874 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=HvtDsECHp0w0UK32dMGhjJeYwBHIUDuAoMY/myIXTPA=; b=N4Sv1Jg1W5LSky v5oYg1pn4tG8973rLR1alXmH7pzr/rFwctRyr0p+UQLLazx5xspK+zljggtGexX8sNlVqMpv+52af Mlsr9X3WbdB3VbR7BN+cMU4sNlwArZrnVuZLBytHl2k2JX7cApfCrD1uznwRMlNw4tHLyXQ5vujmw QsZueryB8hGH0q9PtqQ3H9V/AVVU7dNF0fbXnqj0skPjunTsaySvZIb8zeM8zZUriKRggRzzOMf69 BXPVJD1jPL14TWoLa2rrS0F8+kNrcdR/hVsxCB4nfprH64glWp/pr9arpTRxIlmTh0pDVehYWprCH YcWWRiT62X9fCRSWFljw==; 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 1i298N-0002l2-M5; Mon, 26 Aug 2019 07:09:47 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1i298J-0002k5-Kh; Mon, 26 Aug 2019 07:09:45 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id B04E568B02; Mon, 26 Aug 2019 09:09:39 +0200 (CEST) Date: Mon, 26 Aug 2019 09:09:39 +0200 From: Christoph Hellwig To: Nicolas Saenz Julienne Subject: Re: [PATCH v2 01/11] asm-generic: add dma_zone_size Message-ID: <20190826070939.GD11331@lst.de> References: <20190820145821.27214-1-nsaenzjulienne@suse.de> <20190820145821.27214-2-nsaenzjulienne@suse.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190820145821.27214-2-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-20190826_000944_757939_D0F6482F X-CRM114-Status: UNSURE ( 8.24 ) 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: catalin.marinas@arm.com, eric@anholt.net, linux-riscv@lists.infradead.org, frowand.list@gmail.com, hch@lst.de, m.szyprowski@samsung.com, linux-arch@vger.kernel.org, f.fainelli@gmail.com, will@kernel.org, devicetree@vger.kernel.org, Arnd Bergmann , marc.zyngier@arm.com, robh+dt@kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, phill@raspberryi.org, mbrugger@suse.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, wahrenst@gmx.net, akpm@linux-foundation.org, Robin Murphy 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 Tue, Aug 20, 2019 at 04:58:09PM +0200, Nicolas Saenz Julienne wrote: > Some architectures have platform specific DMA addressing limitations. > This will allow for hardware description code to provide the constraints > in a generic manner, so as for arch code to properly setup it's memory > zones and DMA mask. I know this just spreads the arm code, but I still kinda hate it. MAX_DMA_ADDRESS is such an oddly defined concepts. We have the mm code that uses it to start allocating after the dma zones, but I think that would better be done using a function returning 1 << max(zone_dma_bits, 32) or so. Then we have about a handful of drivers using it that all seem rather bogus, and one of which I think are usable on arm64. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel