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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 C18BBCA9ECB for ; Thu, 31 Oct 2019 15:50:28 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 6BEA32087F for ; Thu, 31 Oct 2019 15:50:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6BEA32087F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 473qXd0hzyzF63g for ; Fri, 1 Nov 2019 02:50:25 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lst.de (client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=lst.de Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 473qV03HZzzF5ZS for ; Fri, 1 Nov 2019 02:48:06 +1100 (AEDT) Received: by verein.lst.de (Postfix, from userid 2407) id 4190F68BE1; Thu, 31 Oct 2019 16:48:00 +0100 (CET) Date: Thu, 31 Oct 2019 16:47:59 +0100 From: Christoph Hellwig To: Nicolas Saenz Julienne Subject: Re: [PATCH] dma/direct: turn ARCH_ZONE_DMA_BITS into a variable Message-ID: <20191031154759.GA7162@lst.de> References: <20191031152837.15253-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191031152837.15253-1-nsaenzjulienne@suse.de> User-Agent: Mutt/1.5.17 (2007-11-01) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390@vger.kernel.org, Vasily Gorbik , Will Deacon , Catalin Marinas , linuxppc-dev@lists.ozlabs.org, Heiko Carstens , linux-kernel@vger.kernel.org, Christian Borntraeger , iommu@lists.linux-foundation.org, Paul Mackerras , Robin Murphy , Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Marek Szyprowski Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, Oct 31, 2019 at 04:28:37PM +0100, Nicolas Saenz Julienne wrote: > Some architectures, notably ARM, are interested in tweaking this > depending on their runtime DMA addressing limitations. > > Signed-off-by: Nicolas Saenz Julienne > --- > > Changes since RFC: > - Rebased to v5.4-rc6, fixed arm64 code. > > NOTE: This will only apply to linux-next, where missing end of the sentence. But only applying to linux-next isn't going to help anyone.. > diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c > index 45c00a54909c..f716ea634804 100644 > --- a/arch/arm64/mm/init.c > +++ b/arch/arm64/mm/init.c > @@ -20,6 +20,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -41,6 +42,8 @@ > #include > #include > > +#define ARM64_ZONE_DMA_BITS 30 > + > /* > * We need to be able to catch inadvertent references to memstart_addr > * that occur (potentially in generic code) before arm64_memblock_init() > @@ -424,6 +427,8 @@ void __init arm64_memblock_init(void) > else > arm64_dma_phys_limit = PHYS_MASK + 1; > > + zone_dma_bits = ARM64_ZONE_DMA_BITS; > + > reserve_crashkernel(); This actually adds a new limit, as there wasn't one before for arm64.