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=-9.8 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_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 325D4C433FF for ; Wed, 14 Aug 2019 13:39:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 13E7A206C2 for ; Wed, 14 Aug 2019 13:39:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728100AbfHNNjN (ORCPT ); Wed, 14 Aug 2019 09:39:13 -0400 Received: from 8bytes.org ([81.169.241.247]:49366 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726821AbfHNNir (ORCPT ); Wed, 14 Aug 2019 09:38:47 -0400 Received: by theia.8bytes.org (Postfix, from userid 1000) id 1670A527; Wed, 14 Aug 2019 15:38:43 +0200 (CEST) From: Joerg Roedel To: Joerg Roedel Cc: corbet@lwn.net, tony.luck@intel.com, fenghua.yu@intel.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org, linux-doc@vger.kernel.org, linux-ia64@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Thomas.Lendacky@amd.com, Suravee.Suthikulpanit@amd.com, Joerg Roedel Subject: [PATCH 09/10] iommu: Disable passthrough mode when SME is active Date: Wed, 14 Aug 2019 15:38:40 +0200 Message-Id: <20190814133841.7095-10-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190814133841.7095-1-joro@8bytes.org> References: <20190814133841.7095-1-joro@8bytes.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joerg Roedel Using Passthrough mode when SME is active causes certain devices to use the SWIOTLB bounce buffer. The bounce buffer code has an upper limit of 256kb for the size of DMA allocations, which is too small for certain devices and causes them to fail. With this patch we enable IOMMU by default when SME is active in the system, making the default configuration work for more systems than it does now. Users that don't want IOMMUs to be enabled still can disable them with kernel parameters. Signed-off-by: Joerg Roedel --- drivers/iommu/iommu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 96cc7cc8ab21..4bc9025a9975 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -119,6 +119,11 @@ static int __init iommu_subsys_init(void) iommu_set_default_passthrough(); else iommu_set_default_translated(); + + if (iommu_default_passthrough() && sme_active()) { + pr_info("SME detected - Disabling default IOMMU Passthrough\n"); + iommu_set_default_translated(); + } } pr_info("Default domain type: %s %s\n", -- 2.17.1