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[209.132.180.67]) by mx.google.com with ESMTP id y11-v6si3849819plg.301.2018.07.27.10.15.12; Fri, 27 Jul 2018 10:15:27 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=pEijCbEC; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388813AbeG0Sgc (ORCPT + 99 others); Fri, 27 Jul 2018 14:36:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:56540 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730850AbeG0Sgc (ORCPT ); Fri, 27 Jul 2018 14:36:32 -0400 Received: from mail-qt0-f175.google.com (mail-qt0-f175.google.com [209.85.216.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A6798208C2; Fri, 27 Jul 2018 17:13:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1532711623; bh=zhXGrDnLdW2Vbz3oRvzxOQFoPJOgxEVZ0Y85dL4QBxM=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=pEijCbECTmq/QBB6x339LjR6qdPY5LBbOypUPZnpUHba84lHFvztEhx1dmIOPiBut K3H6g8Ae1UAX8BG5Kh882HxJTwnG7rBsqx51iCOX/lQHXkon2Kieae7qhV3RZBaxNj MoCrVVp/SOI25poeedqjaY/CuRECPMVJ4FGo9Cgk= Received: by mail-qt0-f175.google.com with SMTP id c15-v6so5789062qtp.0; Fri, 27 Jul 2018 10:13:43 -0700 (PDT) X-Gm-Message-State: AOUpUlFRzTAFHOVRF/fuxt8+kv7oYfY4ie1c77ozBToSRuAZVQlCKleO Li3HGU7VGpEQZ2IWQTTq8Oa0ebBfQrNxwzQpvg== X-Received: by 2002:a0c:f411:: with SMTP id h17-v6mr6489490qvl.25.1532711622874; Fri, 27 Jul 2018 10:13:42 -0700 (PDT) MIME-Version: 1.0 References: <20180726231624.21084-1-digetx@gmail.com> <20180727082512.lpvmeuvxnw3mpeym@8bytes.org> <20180727090328.GH28088@arm.com> <4164951.xGHfcFJ9uZ@dimapc> <20180727142000.76zgficpta473snl@8bytes.org> In-Reply-To: <20180727142000.76zgficpta473snl@8bytes.org> From: Rob Herring Date: Fri, 27 Jul 2018 11:13:31 -0600 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU To: Joerg Roedel Cc: Dmitry Osipenko , Will Deacon , Greg Kroah-Hartman , "Rafael J. Wysocki" , Thierry Reding , Jon Hunter , Mikko Perttunen , Frank Rowand , bskeggs@redhat.com, Russell King , Catalin Marinas , kwizart@gmail.com, devicetree@vger.kernel.org, nouveau@lists.freedesktop.org, Linux IOMMU , dri-devel , linux-tegra@vger.kernel.org, "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 27, 2018 at 8:20 AM Joerg Roedel wrote: > > On Fri, Jul 27, 2018 at 05:10:22PM +0300, Dmitry Osipenko wrote: > > I'm not sure what you guys are meaning by the "firmware", could you elaborate > > please? Do you mean the Open Firmware and hence the devicetree or what? > > Yes, I think the best way to request this is using a device-tree > property. Letting the device driver request it is definitly a bad idea. I don't follow why we need a property rather than being implied by the device's (the GPU) compatible string. Rob