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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no 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 36A56C55186 for ; Wed, 22 Apr 2020 08:09:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B7B9206E9 for ; Wed, 22 Apr 2020 08:09:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726321AbgDVIJX (ORCPT ); Wed, 22 Apr 2020 04:09:23 -0400 Received: from mga01.intel.com ([192.55.52.88]:3118 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725810AbgDVIJW (ORCPT ); Wed, 22 Apr 2020 04:09:22 -0400 IronPort-SDR: SjwJpBwfe4wHCh4ayL/YBGaSQZ7FjFkdBFGySeM+LnnSM3Yto9xtuIxHYRojSuip/2ZEW6sMAJ SkP9sUwBrw4A== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 01:09:22 -0700 IronPort-SDR: NYAah0qsiK+CbyM/jO/clQIEDbrOCPop07kDA389yxLeqORC7eqQWTB0w7sqRpL07tXgPNqWp+ jEk/3J5OMTAQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,412,1580803200"; d="scan'208";a="365609616" Received: from allen-box.sh.intel.com ([10.239.159.139]) by fmsmga001.fm.intel.com with ESMTP; 22 Apr 2020 01:09:20 -0700 From: Lu Baolu To: Joerg Roedel Cc: ashok.raj@intel.com, jacob.jun.pan@linux.intel.com, Liu Yi L , kevin.tian@intel.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH v3 0/4] iommu/vt-d: Add page request draining support Date: Wed, 22 Apr 2020 16:06:07 +0800 Message-Id: <20200422080611.15689-1-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When a PASID is stopped or terminated, there can be pending PRQs (requests that haven't received responses) in the software and remapping hardware. The pending page requests must be drained so that the pasid could be reused. The chapter 7.10 in the VT-d specification specifies the software steps to drain pending page requests and responses. This includes two parts: - PATCH 1/4 ~ 2/4: refactor the qi_submit_sync() to support multiple descriptors per submission which will be used in the following patch. - PATCH 3/4 ~ 4/4: add page request drain support after a pasid entry is torn down. Please help to review. Best regards, baolu Change log: v2->v3: - Address Kevin's review comments - Squash the first 2 patches together; - The prq thread is serialized, no need to consider reentrance; - Ensure no new-coming prq before drain prq in queue; - Handle page request overflow case. v1->v2: - Fix race between multiple prq handling threads. Lu Baolu (4): iommu/vt-d: Multiple descriptors per qi_submit_sync() iommu/vt-d: debugfs: Add support to show inv queue internals iommu/vt-d: Add page request draining support iommu/vt-d: Remove redundant IOTLB flush drivers/iommu/dmar.c | 63 +++++++++------- drivers/iommu/intel-iommu-debugfs.c | 62 +++++++++++++++ drivers/iommu/intel-pasid.c | 4 +- drivers/iommu/intel-svm.c | 112 +++++++++++++++++++++++++--- drivers/iommu/intel_irq_remapping.c | 2 +- include/linux/intel-iommu.h | 13 +++- 6 files changed, 216 insertions(+), 40 deletions(-) -- 2.17.1