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=-3.0 required=3.0 tests=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 43996C10F0E for ; Thu, 18 Apr 2019 14:00:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1591D2083D for ; Thu, 18 Apr 2019 14:00:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389152AbfDROAG (ORCPT ); Thu, 18 Apr 2019 10:00:06 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:35408 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729331AbfDROAG (ORCPT ); Thu, 18 Apr 2019 10:00:06 -0400 Received: from DGGEMS408-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 88937F67DDE42C3BF8C7; Thu, 18 Apr 2019 22:00:02 +0800 (CST) Received: from HGHY1l002753561.china.huawei.com (10.177.23.164) by DGGEMS408-HUB.china.huawei.com (10.3.19.208) with Microsoft SMTP Server id 14.3.408.0; Thu, 18 Apr 2019 21:59:56 +0800 From: Zhen Lei To: Jean-Philippe Brucker , John Garry , Robin Murphy , Will Deacon , Joerg Roedel , Jonathan Corbet , linux-doc , Sebastian Ott , Gerald Schaefer , "Martin Schwidefsky" , Heiko Carstens , Benjamin Herrenschmidt , Paul Mackerras , "Michael Ellerman" , Tony Luck , Fenghua Yu , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , David Woodhouse , iommu , linux-kernel , linux-s390 , linuxppc-dev , x86 , linux-ia64 CC: Zhen Lei , Hanjun Guo Subject: [PATCH v6 0/1] iommu: enhance IOMMU dma mode build options Date: Thu, 18 Apr 2019 21:57:00 +0800 Message-ID: <20190418135701.24668-1-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.19.2.windows.1 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.177.23.164] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org v5 --> v6: 1. give up adding boot option iommu.dma_mode v4 --> v5: As Hanjun and Thomas Gleixner's suggestion: 1. Keep the old ARCH specific boot options no change. 2. Keep build option CONFIG_IOMMU_DEFAULT_PASSTHROUGH no change. v4: As Robin Murphy's suggestion: "It's also not necessarily obvious to the user how this interacts with IOMMU_DEFAULT_PASSTHROUGH, so if we really do go down this route, maybe it would be better to refactor the whole lot into a single selection of something like IOMMU_DEFAULT_MODE anyway." In this version, I tried to normalize the IOMMU dma mode boot options for all ARCHs. When IOMMU is enabled, there are 3 dma modes: paasthrough(bypass), lazy(mapping but defer the IOTLB invalidation), strict. But currently each ARCHs defined their private boot options, different with each other. For example, to enable/disable "passthrough", ARM64 use iommu.passthrough=1/0, X86 use iommu=pt/nopt, PPC/POWERNV use iommu=nobypass. Zhen Lei (1): iommu: enhance IOMMU dma mode build options arch/ia64/kernel/pci-dma.c | 2 +- arch/powerpc/platforms/powernv/pci-ioda.c | 3 ++- arch/s390/pci/pci_dma.c | 2 +- arch/x86/kernel/pci-dma.c | 7 ++--- drivers/iommu/Kconfig | 44 ++++++++++++++++++++++++++----- drivers/iommu/amd_iommu_init.c | 3 ++- drivers/iommu/intel-iommu.c | 2 +- drivers/iommu/iommu.c | 3 ++- 8 files changed, 48 insertions(+), 18 deletions(-) -- 1.8.3