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=-2.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 7F26DC28CF6 for ; Thu, 26 Jul 2018 23:23:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 35D5F20883 for ; Thu, 26 Jul 2018 23:23:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GYSTlGSt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 35D5F20883 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732065AbeG0Alg (ORCPT ); Thu, 26 Jul 2018 20:41:36 -0400 Received: from mail-lf1-f67.google.com ([209.85.167.67]:46124 "EHLO mail-lf1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730610AbeG0Alf (ORCPT ); Thu, 26 Jul 2018 20:41:35 -0400 Received: by mail-lf1-f67.google.com with SMTP id l16-v6so2319946lfc.13; Thu, 26 Jul 2018 16:22:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=O+e/im9YZ70ju1A0neTQHuRteCq93hPLVv7chPKaQl4=; b=GYSTlGStsfO6u4BW3It+2ufAu0sofqFlN0hIoZczNqvzwqXWYDxq+20VmXlEWcut9n GsdgdRLdd23ns7uXhr1bFXG0mDeoRTVd2h14CrvtK81k8RGyMQGRRUG8aTLcaF5pKuSc 3rOlL0IM788wIugFJS28KUd8vY/1IdIWn1pr95vlWzSomhL6+2bQhLFZUKrdXxC79VAf XEa3yKdy3BA2KP5j7ojV2Xen85dY5XJyiH2pk+Mf1Jp8Xhv/oEM86IJ6fb1xlOMtx6se Jrbjd2QJpnxP0Vl0ieJWJDXxKPGyoJZT804sUxK/aBH6+m6HkZdOFkhhX2BFKfOcj3Qe oQ9A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=O+e/im9YZ70ju1A0neTQHuRteCq93hPLVv7chPKaQl4=; b=hwFejf5RJTqUoBinbLxYLN2j/co3oQ53VDwW7YBaHICKDGvwwPDPGFd4n2lz22Y6CA t3nuyI5T5rNDNaqk6nuXsq+9MTrObFWDUFiZvtf5cKS3cb/ualDQ4lYTZzGJPLGIVxeU Bu+DoKAhbRLgex8Q9VBIMuqYeFZ4w+hEeaPjVybtxR71Cd0i823qaKiZf8OHHjsyeOCc ZjaZar2d7gr5Ap5LQulHvXsiAhYOcEcIHKzNYf/EXnM0vEE+t4KA+dgWvCnj7dHjUyVc dlp8aH8Clpp7gsio1zMZwVKhTI5dN5Icb7ddvxvMErXJYzpaxnOIoUz/VYAb/ybf9gC5 hVxA== X-Gm-Message-State: AOUpUlF+yynOTKDF67EBzxY45J4MDAjDXuMlrC66+LNXFGkeZFr5+8nU VTd/4w0FjTgKvxZRdZkI9Mo= X-Google-Smtp-Source: AAOMgpd7uptmuOgsvdEPcDNF4IVTY06fwQllp60hnf+Dybs7iMhg02K5qeaQ33WLchf2Rb1Tqsod+w== X-Received: by 2002:a19:4ecd:: with SMTP id u74-v6mr2410628lfk.57.1532647352254; Thu, 26 Jul 2018 16:22:32 -0700 (PDT) Received: from localhost.localdomain (109-252-90-13.nat.spd-mgts.ru. [109.252.90.13]) by smtp.gmail.com with ESMTPSA id q15-v6sm411541ljg.62.2018.07.26.16.22.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 26 Jul 2018 16:22:31 -0700 (PDT) From: Dmitry Osipenko To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Thierry Reding , Jonathan Hunter , Mikko Perttunen , Rob Herring , Frank Rowand , Ben Skeggs , Russell King , Catalin Marinas , Will Deacon , Joerg Roedel , Nicolas Chauvet Cc: devicetree@vger.kernel.org, nouveau@lists.freedesktop.org, iommu@lists.linux-foundation.org, dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v1 2/6] of/device: Don't back devices DMA with IOMMU if that's undesired by driver Date: Fri, 27 Jul 2018 02:16:20 +0300 Message-Id: <20180726231624.21084-3-digetx@gmail.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180726231624.21084-1-digetx@gmail.com> References: <20180726231624.21084-1-digetx@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Respect device driver requirement for device DMA not to be implicitly backed with IOMMU by skipping the backing setup for drivers that do not want that. Signed-off-by: Dmitry Osipenko --- drivers/of/device.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/of/device.c b/drivers/of/device.c index 33d85511d790..e70b7a886875 100644 --- a/drivers/of/device.c +++ b/drivers/of/device.c @@ -163,6 +163,13 @@ int of_dma_configure(struct device *dev, struct device_node *np, bool force_dma) dev_dbg(dev, "device is%sbehind an iommu\n", iommu ? " " : " not "); + /* + * Respect device driver requirement for device DMA not to be + * implicitly backed with IOMMU. + */ + if (iommu && dev->driver->no_implicit_iommu) + iommu = NULL; + arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent); return 0; -- 2.18.0