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 4B85CC43334 for ; Wed, 29 Jun 2022 07:51:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231465AbiF2Hv4 (ORCPT ); Wed, 29 Jun 2022 03:51:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36286 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230514AbiF2Hvz (ORCPT ); Wed, 29 Jun 2022 03:51:55 -0400 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 606E125C57 for ; Wed, 29 Jun 2022 00:51:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1656489112; x=1688025112; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=nv6IKg36g4e5eVCX/5L0FmvRD5dFbZMAXtl/6cXjhDk=; b=AfDhXHFBBwxjJLvPx4aElSXSJofRRicj5q2otTWTvVlTYEfJ/FykhO0S C8P7ybhfP9W1QjKN0PRXckf8HmiOztB/l6lK9bqVeFI4XlFvZN7AcEEmR Vl0f8cwz0IrNnFuLZw32baK9ZlGxPpUl+0RJj+fqxKIhPSAJJ7g+ySiz7 /zSFAYLt7Xc3OxTK93nlTa40ALv4rFjM6x94wTpL3N8Eh5yoxpP2yKLm6 cUU7cjpLr3lLywZwFEm7H+bw6kGqc+1APAkmgbDhX16+PcudUN8W1FhZ9 jks1NRetvBDbwrUhNYkLbGnHUhCkmn3ZGNDw9hB1kM9tM04mQb3oiS3EU A==; X-IronPort-AV: E=McAfee;i="6400,9594,10392"; a="270719356" X-IronPort-AV: E=Sophos;i="5.92,230,1650956400"; d="scan'208";a="270719356" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Jun 2022 00:51:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.92,230,1650956400"; d="scan'208";a="588209571" Received: from allen-box.sh.intel.com ([10.239.159.48]) by orsmga007.jf.intel.com with ESMTP; 29 Jun 2022 00:51:49 -0700 From: Lu Baolu To: iommu@lists.linux-foundation.org, iommu@lists.linux.dev Cc: Kevin Tian , Ashok Raj , Liu Yi L , Jacob jun Pan , linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH v3 00/11] iommu/vt-d: Optimize the use of locks Date: Wed, 29 Jun 2022 15:47:14 +0800 Message-Id: <20220629074725.2331441-1-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi folks, This series tries to optimize the uses of two locks in the Intel IOMMU driver: - The intel_iommu::lock is used to protect the IOMMU resources shared by devices. They include the IOMMU root and context tables, the pasid tables and the domain IDs. - The global device_domain_lock is used to protect the global and the per-domain device tracking lists. The optimization includes: - Remove the unnecessary global device tracking list; - Remove unnecessary locking; - Reduce the scope of the lock as much as possible, that is, use the lock only where necessary; - The global lock is transformed into a local lock to improve the efficiency. This series is also available on github: https://github.com/LuBaolu/intel-iommu/commits/intel-iommu-lock-optimization-v3 Your comments and suggestions are very appreciated. Best regards, baolu Change log: v3: - Split reduction of lock ranges from changing irqsave. https://lore.kernel.org/linux-iommu/BN9PR11MB52760A3D7C6BF1AF9C9D34658CAA9@BN9PR11MB5276.namprd11.prod.outlook.com/ - Fully initialize the dev_info before adding it to the list. https://lore.kernel.org/linux-iommu/BN9PR11MB52764D7CD86448C5E4EB46668CAA9@BN9PR11MB5276.namprd11.prod.outlook.com/ - Various code and comments refinement. v2: - https://lore.kernel.org/linux-iommu/20220614025137.1632762-1-baolu.lu@linux.intel.com/ - Split the lock-free page walk issue into a new patch: https://lore.kernel.org/linux-iommu/20220609070811.902868-1-baolu.lu@linux.intel.com/ - Drop the conversion from spinlock to mutex and make this series cleanup purpose only. - Address several comments received during v1 review. v1: - https://lore.kernel.org/linux-iommu/20220527063019.3112905-1-baolu.lu@linux.intel.com/ - Initial post. Lu Baolu (11): iommu/vt-d: debugfs: Remove device_domain_lock usage iommu/vt-d: Remove clearing translation data in disable_dmar_iommu() iommu/vt-d: Use pci_get_domain_bus_and_slot() in pgtable_walk() iommu/vt-d: Unnecessary spinlock for root table alloc and free iommu/vt-d: Replace spin_lock_irqsave() with spin_lock() iommu/vt-d: Acquiring lock in domain ID allocation helpers iommu/vt-d: Acquiring lock in pasid manipulation helpers iommu/vt-d: Check device list of domain in domain free path iommu/vt-d: Fold __dmar_remove_one_dev_info() into its caller iommu/vt-d: Use device_domain_lock accurately iommu/vt-d: Convert global spinlock into per domain lock drivers/iommu/intel/iommu.h | 3 +- drivers/iommu/intel/pasid.h | 1 + drivers/iommu/intel/debugfs.c | 49 ++++--- drivers/iommu/intel/iommu.c | 248 ++++++++++------------------------ drivers/iommu/intel/pasid.c | 103 +++++++------- drivers/iommu/intel/svm.c | 5 +- 6 files changed, 164 insertions(+), 245 deletions(-) -- 2.25.1