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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 CDBCCC433E9 for ; Thu, 21 Jan 2021 02:35:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D34C2389A for ; Thu, 21 Jan 2021 02:35:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436739AbhAUCYz (ORCPT ); Wed, 20 Jan 2021 21:24:55 -0500 Received: from mga07.intel.com ([134.134.136.100]:31116 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393000AbhAUBzc (ORCPT ); Wed, 20 Jan 2021 20:55:32 -0500 IronPort-SDR: YBS2wxNTOU+6lK20imfGq1ENK5NtgPr+hvexJtxlWrl3bwb9reiF26fJEaRrItk91UD68hGzE+ L+xrd5/E5YEg== X-IronPort-AV: E=McAfee;i="6000,8403,9870"; a="243275398" X-IronPort-AV: E=Sophos;i="5.79,362,1602572400"; d="scan'208";a="243275398" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jan 2021 17:53:34 -0800 IronPort-SDR: 3k9uywaSMdFyyUz24lP5uLRP7uCP4WNv3wP7iolkairLK8NJct3J3L4ui6vbBD8ln0LrPnDqV5 6f3DtT4t2N8g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.79,362,1602572400"; d="scan'208";a="391762248" Received: from allen-box.sh.intel.com ([10.239.159.28]) by orsmga007.jf.intel.com with ESMTP; 20 Jan 2021 17:53:32 -0800 From: Lu Baolu To: Joerg Roedel , Will Deacon Cc: Ashok Raj , Jacob Pan , Kevin Tian , Liu Yi L , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH 1/3] iommu/vt-d: Add rate limited information when PRQ overflows Date: Thu, 21 Jan 2021 09:45:03 +0800 Message-Id: <20210121014505.1659166-2-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210121014505.1659166-1-baolu.lu@linux.intel.com> References: <20210121014505.1659166-1-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 So that the uses could get chances to know what happened. Suggested-by: Ashok Raj Signed-off-by: Lu Baolu --- drivers/iommu/intel/svm.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c index 033b25886e57..f49fe715477b 100644 --- a/drivers/iommu/intel/svm.c +++ b/drivers/iommu/intel/svm.c @@ -895,6 +895,7 @@ static irqreturn_t prq_event_thread(int irq, void *d) struct intel_iommu *iommu = d; struct intel_svm *svm = NULL; int head, tail, handled = 0; + struct page_req_dsc *req; /* Clear PPR bit before reading head/tail registers, to * ensure that we get a new interrupt if needed. */ @@ -904,7 +905,6 @@ static irqreturn_t prq_event_thread(int irq, void *d) head = dmar_readq(iommu->reg + DMAR_PQH_REG) & PRQ_RING_MASK; while (head != tail) { struct vm_area_struct *vma; - struct page_req_dsc *req; struct qi_desc resp; int result; vm_fault_t ret; @@ -1042,8 +1042,14 @@ static irqreturn_t prq_event_thread(int irq, void *d) * Clear the page request overflow bit and wake up all threads that * are waiting for the completion of this handling. */ - if (readl(iommu->reg + DMAR_PRS_REG) & DMA_PRS_PRO) + if (readl(iommu->reg + DMAR_PRS_REG) & DMA_PRS_PRO) { + head = dmar_readq(iommu->reg + DMAR_PQH_REG) & PRQ_RING_MASK; + req = &iommu->prq[head / sizeof(*req)]; + pr_warn_ratelimited("IOMMU: %s: Page request overflow: HEAD: %08llx %08llx", + iommu->name, ((unsigned long long *)req)[0], + ((unsigned long long *)req)[1]); writel(DMA_PRS_PRO, iommu->reg + DMAR_PRS_REG); + } if (!completion_done(&iommu->prq_complete)) complete(&iommu->prq_complete); -- 2.25.1