From patchwork Tue Apr 22 07:07:33 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiang Liu X-Patchwork-Id: 4029031 Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id AFCCA9F1F4 for ; Tue, 22 Apr 2014 07:08:08 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id DA73A201B4 for ; Tue, 22 Apr 2014 07:08:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F1256201B9 for ; Tue, 22 Apr 2014 07:08:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754356AbaDVHHl (ORCPT ); Tue, 22 Apr 2014 03:07:41 -0400 Received: from mga09.intel.com ([134.134.136.24]:37313 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752537AbaDVHHi (ORCPT ); Tue, 22 Apr 2014 03:07:38 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP; 22 Apr 2014 00:02:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,902,1389772800"; d="scan'208";a="517082331" Received: from gerry-dev.bj.intel.com ([10.238.158.74]) by fmsmga001.fm.intel.com with ESMTP; 22 Apr 2014 00:07:19 -0700 From: Jiang Liu To: Joerg Roedel , David Woodhouse , Yinghai Lu , Bjorn Helgaas , Dan Williams , Vinod Koul , "Rafael J . Wysocki" Cc: Jiang Liu , Ashok Raj , Yijing Wang , Tony Luck , iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org Subject: [Patch Part3 V1 22/22] iommu/vt-d: fix bug in computing domain's iommu_snooping flag Date: Tue, 22 Apr 2014 15:07:33 +0800 Message-Id: <1398150453-28141-23-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1398150453-28141-1-git-send-email-jiang.liu@linux.intel.com> References: <1398150453-28141-1-git-send-email-jiang.liu@linux.intel.com> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP IOMMU units may dynamically attached to/detached from domains, so we should scan all active IOMMU units when computing iommu_snooping flag for a domain instead of only scanning IOMMU units associated with the domain. Also check snooping and superpage capabilities when hot-adding DMAR units. Signed-off-by: Jiang Liu --- drivers/iommu/intel-iommu.c | 54 ++++++++++++++++++++++++++++--------------- 1 file changed, 36 insertions(+), 18 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 6d5b94aaac6e..9c39cab62cc1 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -626,50 +626,56 @@ static void domain_update_iommu_coherency(struct dmar_domain *domain) rcu_read_unlock(); } -static void domain_update_iommu_snooping(struct dmar_domain *domain) +static int domain_update_iommu_snooping(struct intel_iommu *skip) { - int i; - - domain->iommu_snooping = 1; + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + int ret = 1; - for_each_set_bit(i, domain->iommu_bmp, g_num_of_iommus) { - if (!ecap_sc_support(g_iommus[i]->ecap)) { - domain->iommu_snooping = 0; - break; + rcu_read_lock(); + for_each_active_iommu(iommu, drhd) { + if (iommu != skip) { + if (!ecap_sc_support(iommu->ecap)) { + ret = 0; + break; + } } } + rcu_read_unlock(); + + return ret; } -static void domain_update_iommu_superpage(struct dmar_domain *domain) +static int domain_update_iommu_superpage(struct intel_iommu *skip) { struct dmar_drhd_unit *drhd; - struct intel_iommu *iommu = NULL; + struct intel_iommu *iommu; int mask = 0xf; if (!intel_iommu_superpage) { - domain->iommu_superpage = 0; - return; + return 0; } /* set iommu_superpage to the smallest common denominator */ rcu_read_lock(); for_each_active_iommu(iommu, drhd) { - mask &= cap_super_page_val(iommu->cap); - if (!mask) { - break; + if (iommu != skip) { + mask &= cap_super_page_val(iommu->cap); + if (!mask) + break; } } rcu_read_unlock(); - domain->iommu_superpage = fls(mask); + return fls(mask); } /* Some capabilities may be different across iommus */ static void domain_update_iommu_cap(struct dmar_domain *domain) { domain_update_iommu_coherency(domain); - domain_update_iommu_snooping(domain); - domain_update_iommu_superpage(domain); + domain->iommu_snooping = domain_update_iommu_snooping(NULL); + domain->iommu_superpage = domain_update_iommu_superpage(NULL); } static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn) @@ -3793,6 +3799,18 @@ static int intel_iommu_add(struct dmar_drhd_unit *dmaru) iommu->name); return -ENXIO; } + if (!ecap_sc_support(iommu->ecap) && + domain_update_iommu_snooping(iommu)) { + pr_warn("IOMMU: %s doesn't support snooping.\n", + iommu->name); + return -ENXIO; + } + if ((cap_super_page_val(iommu->cap) & + (1 << domain_update_iommu_superpage(iommu))) == 0) { + pr_warn("IOMMU: %s doesn't support large page.\n", + iommu->name); + return -ENXIO; + } /* * Disable translation if already enabled prior to OS handover.