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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D093FC433EF for ; Tue, 12 Jul 2022 00:16:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231971AbiGLAQL (ORCPT ); Mon, 11 Jul 2022 20:16:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50808 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231445AbiGLAPg (ORCPT ); Mon, 11 Jul 2022 20:15:36 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BBEA38AB3D for ; Mon, 11 Jul 2022 17:14:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1657584886; x=1689120886; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=C8Uzw/OFgKD9tbEvzPbFnAX3iv82DoXowylUk3SZ2PY=; b=hhvXF/CUXHCocdnQxbJ2Ch7b1Os+WcEuMmuoMfpDqFg5CgWVzXFs8o+L Z/fnjc6tF/6KMFdty7/hFX1nRzemmzrnlcs5EOrUUZp7wOkm8xFqcMcEK 6YqAqzFt2jxwzvwg/jNVq0vJUqvomaBgnstMbMCpegpIn0OFziHNrUd3b 5QiDio70YdykkusbwKjPmsAgeVc4igC71lNwQDEInZIzxpTbu+/jpmYrX cqOkXmfhPXEUVLCDq9Qwn1H7k8LNMJZpNFdT+SMyUuuHxrDr2PkrEiiNE PMtIY2dY6gBaNnhiib8/+dtDmLdfZFuXJBBUM6wN4nwJlaQTl6MnHclRp Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10405"; a="285929325" X-IronPort-AV: E=Sophos;i="5.92,264,1650956400"; d="scan'208";a="285929325" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jul 2022 17:14:26 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.92,264,1650956400"; d="scan'208";a="592445847" Received: from allen-box.sh.intel.com ([10.239.159.48]) by orsmga007.jf.intel.com with ESMTP; 11 Jul 2022 17:14:07 -0700 From: Lu Baolu To: Joerg Roedel Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 18/25] iommu/vt-d: Use device_domain_lock accurately Date: Tue, 12 Jul 2022 08:09:01 +0800 Message-Id: <20220712000908.3431936-19-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220712000908.3431936-1-baolu.lu@linux.intel.com> References: <20220712000908.3431936-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The device_domain_lock is used to protect the device tracking list of a domain. Remove unnecessary spin_lock/unlock()'s and move the necessary ones around the list access. Signed-off-by: Lu Baolu Reviewed-by: Kevin Tian Link: https://lore.kernel.org/r/20220706025524.2904370-11-baolu.lu@linux.intel.com --- drivers/iommu/intel/iommu.c | 57 +++++++++++++------------------------ 1 file changed, 19 insertions(+), 38 deletions(-) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index ccddf634fae9..ae42a9e43997 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -535,15 +535,8 @@ static int domain_update_device_node(struct dmar_domain *domain) struct device_domain_info *info; int nid = NUMA_NO_NODE; - assert_spin_locked(&device_domain_lock); - - if (list_empty(&domain->devices)) - return NUMA_NO_NODE; - + spin_lock(&device_domain_lock); list_for_each_entry(info, &domain->devices, link) { - if (!info->dev) - continue; - /* * There could possibly be multiple device numa nodes as devices * within the same domain may sit behind different IOMMUs. There @@ -554,6 +547,7 @@ static int domain_update_device_node(struct dmar_domain *domain) if (nid != NUMA_NO_NODE) break; } + spin_unlock(&device_domain_lock); return nid; } @@ -1376,23 +1370,23 @@ static void __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did, } static struct device_domain_info * -iommu_support_dev_iotlb (struct dmar_domain *domain, struct intel_iommu *iommu, - u8 bus, u8 devfn) +iommu_support_dev_iotlb(struct dmar_domain *domain, struct intel_iommu *iommu, + u8 bus, u8 devfn) { struct device_domain_info *info; - assert_spin_locked(&device_domain_lock); - if (!iommu->qi) return NULL; - list_for_each_entry(info, &domain->devices, link) + spin_lock(&device_domain_lock); + list_for_each_entry(info, &domain->devices, link) { if (info->iommu == iommu && info->bus == bus && info->devfn == devfn) { - if (info->ats_supported && info->dev) - return info; - break; + spin_unlock(&device_domain_lock); + return info->ats_supported ? info : NULL; } + } + spin_unlock(&device_domain_lock); return NULL; } @@ -1402,23 +1396,21 @@ static void domain_update_iotlb(struct dmar_domain *domain) struct device_domain_info *info; bool has_iotlb_device = false; - assert_spin_locked(&device_domain_lock); - - list_for_each_entry(info, &domain->devices, link) + spin_lock(&device_domain_lock); + list_for_each_entry(info, &domain->devices, link) { if (info->ats_enabled) { has_iotlb_device = true; break; } - + } domain->has_iotlb_device = has_iotlb_device; + spin_unlock(&device_domain_lock); } static void iommu_enable_dev_iotlb(struct device_domain_info *info) { struct pci_dev *pdev; - assert_spin_locked(&device_domain_lock); - if (!info || !dev_is_pci(info->dev)) return; @@ -1464,8 +1456,6 @@ static void iommu_disable_dev_iotlb(struct device_domain_info *info) { struct pci_dev *pdev; - assert_spin_locked(&device_domain_lock); - if (!dev_is_pci(info->dev)) return; @@ -1906,9 +1896,10 @@ static int domain_context_mapping_one(struct dmar_domain *domain, struct pasid_table *table, u8 bus, u8 devfn) { + struct device_domain_info *info = + iommu_support_dev_iotlb(domain, iommu, bus, devfn); u16 did = domain->iommu_did[iommu->seq_id]; int translation = CONTEXT_TT_MULTI_LEVEL; - struct device_domain_info *info = NULL; struct context_entry *context; int ret; @@ -1922,9 +1913,7 @@ static int domain_context_mapping_one(struct dmar_domain *domain, BUG_ON(!domain->pgd); - spin_lock(&device_domain_lock); spin_lock(&iommu->lock); - ret = -ENOMEM; context = iommu_context_addr(iommu, bus, devfn, 1); if (!context) @@ -1975,7 +1964,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain, * Setup the Device-TLB enable bit and Page request * Enable bit: */ - info = iommu_support_dev_iotlb(domain, iommu, bus, devfn); if (info && info->ats_supported) context_set_sm_dte(context); if (info && info->pri_supported) @@ -1998,7 +1986,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain, goto out_unlock; } - info = iommu_support_dev_iotlb(domain, iommu, bus, devfn); if (info && info->ats_supported) translation = CONTEXT_TT_DEV_IOTLB; else @@ -2044,7 +2031,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain, out_unlock: spin_unlock(&iommu->lock); - spin_unlock(&device_domain_lock); return ret; } @@ -2456,13 +2442,11 @@ static int domain_add_dev_info(struct dmar_domain *domain, struct device *dev) if (!iommu) return -ENODEV; - spin_lock(&device_domain_lock); - info->domain = domain; ret = domain_attach_iommu(domain, iommu); - if (ret) { - spin_unlock(&device_domain_lock); + if (ret) return ret; - } + info->domain = domain; + spin_lock(&device_domain_lock); list_add(&info->link, &domain->devices); spin_unlock(&device_domain_lock); @@ -4638,9 +4622,7 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device *dev) if (!domain) return -EINVAL; - spin_lock(&device_domain_lock); spin_lock(&iommu->lock); - ret = -EINVAL; if (!info->pasid_supported) goto out; @@ -4670,7 +4652,6 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device *dev) out: spin_unlock(&iommu->lock); - spin_unlock(&device_domain_lock); return ret; } -- 2.25.1