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 13612C3A59E for ; Sat, 24 Aug 2019 22:35:05 +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 CC2692133F for ; Sat, 24 Aug 2019 22:35:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="DDoZrBSQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CC2692133F 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=xUXelAxiVFi9ebLKWd7LAIs33bNylX9PtanBZgrOhY4=; b=DDoZrBSQ9fB0mK RubMyxel8DhwcgZYbqlMJr5Scy94mvwgod2IyOQY5ujOIBIdutoVw7vzbxaHFMt3laJuPzPqPeEaS RhbQKZBFyOo87bp4ih2fhpeiR2wgHdk9rXh0hZDomm5PmOs7FbYAM6BzR18kCRRxjsY6WihZXSbno eRA3Z7ibbgUFyL0YkyX6pDiJesCWAqM5cy7z9aEY+Ff8pG11Zh89mUFloaRcVSphDZiZOEMnWomzO jiL2McSz13EcN5h4ylQQIuNTJFJNcdgFogL0zbnmYpbPeJOPle81mzr1CF+DtEbI5aIiw+JJDnCRD zrjenjkUdzhTRjHvosTg==; 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 1i1ecd-00016f-W2; Sat, 24 Aug 2019 22:35:00 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1i1eca-00015v-4r for linux-arm-kernel@lists.infradead.org; Sat, 24 Aug 2019 22:34:57 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 3E93268AEF; Sun, 25 Aug 2019 00:34:50 +0200 (CEST) Date: Sun, 25 Aug 2019 00:34:49 +0200 From: Christoph Hellwig To: Paul Burton Subject: Re: cleanup the dma_pgprot handling Message-ID: <20190824223449.GC21729@lst.de> References: <20190816070754.15653-1-hch@lst.de> <20190823215759.zprrwotlbva46y33@pburton-laptop> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190823215759.zprrwotlbva46y33@pburton-laptop> 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-20190824_153456_340370_11C04FDE X-CRM114-Status: GOOD ( 13.33 ) 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: Shawn Anastasio , Will Deacon , "linux-m68k@lists.linux-m68k.org" , Catalin Marinas , "linuxppc-dev@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" , Russell King , "linux-mips@vger.kernel.org" , "iommu@lists.linux-foundation.org" , Geert Uytterhoeven , James Hogan , Guan Xuetao , Christoph Hellwig , "linux-arm-kernel@lists.infradead.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 Fri, Aug 23, 2019 at 09:58:04PM +0000, Paul Burton wrote: > So I believe uncached & uncached accelerated are another case like that > described above - they're 2 different CCAs but the same "access type", > namely uncached. > > Section 4.9 then goes on to forbid mixing access types, but not CCAs. > > It would be nice if the precise mapping from CCA to access type was > provided, but I don't see that anywhere. I can check with the > architecture team to be sure, but to my knowledge we're fine to mix > access via kseg1 (ie. uncached) & mappings with CCA=7 (uncached > accelerated). Ok. Looks like we can keep it then and I'll add a comment to the code with the above reference. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel