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 4C819C433E6 for ; Tue, 26 Jan 2021 08:16:01 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CFC3922D04 for ; Tue, 26 Jan 2021 08:16:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CFC3922D04 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 97DFC203FE; Tue, 26 Jan 2021 08:16:00 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id G056NCHIXs+z; Tue, 26 Jan 2021 08:15:58 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by silver.osuosl.org (Postfix) with ESMTP id 8FF12203FC; Tue, 26 Jan 2021 08:15:56 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 7EAABC1825; Tue, 26 Jan 2021 08:15:56 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 5D1D6C013A for ; Tue, 26 Jan 2021 08:15:55 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 4C5BF85166 for ; Tue, 26 Jan 2021 08:15:55 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id apFCQS94Efng for ; Tue, 26 Jan 2021 08:15:54 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by fraxinus.osuosl.org (Postfix) with ESMTPS id D8E458511B for ; Tue, 26 Jan 2021 08:15:54 +0000 (UTC) IronPort-SDR: wCZerfw71FQdPvjbP7xuohiIx1W+6SMkSqtdOXaGd+BUy0lzj+0nPUOQux2GgIVe2X7c694E3N X6vbjq4GND4g== X-IronPort-AV: E=McAfee;i="6000,8403,9875"; a="177297775" X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="177297775" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 00:15:54 -0800 IronPort-SDR: Xbaohphle2A6hpHinYJoUconS6x3/FL5WMaizLC41NrzyYieCTl+f02AmYtWxYBe0TX6gj0V3w hEF+PN320ANA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="577725469" Received: from allen-box.sh.intel.com ([10.239.159.128]) by fmsmga005.fm.intel.com with ESMTP; 26 Jan 2021 00:15:52 -0800 From: Lu Baolu To: Joerg Roedel , Will Deacon Subject: [PATCH v2 2/2] iommu/vt-d: Use INVALID response code instead of FAILURE Date: Tue, 26 Jan 2021 16:07:30 +0800 Message-Id: <20210126080730.2232859-3-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210126080730.2232859-1-baolu.lu@linux.intel.com> References: <20210126080730.2232859-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Cc: Kevin Tian , Ashok Raj , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" The VT-d IOMMU response RESPONSE_FAILURE for a page request in below cases: - When it gets a Page_Request with no PASID; - When it gets a Page_Request with PASID that is not in use for this device. This is allowed by the spec, but IOMMU driver doesn't support such cases today. When the device receives RESPONSE_FAILURE, it sends the device state machine to HALT state. Now if we try to unload the driver, it hangs since the device doesn't send any outbound transactions to host when the driver is trying to clear things up. The only possible responses would be for invalidation requests. Let's use RESPONSE_INVALID instead for now, so that the device state machine doesn't enter HALT state. Suggested-by: Ashok Raj Signed-off-by: Lu Baolu --- drivers/iommu/intel/svm.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c index d7c98c5fa4e7..574a7e657a9a 100644 --- a/drivers/iommu/intel/svm.c +++ b/drivers/iommu/intel/svm.c @@ -911,10 +911,8 @@ static irqreturn_t prq_event_thread(int irq, void *d) u64 address; handled = 1; - req = &iommu->prq[head / sizeof(*req)]; - - result = QI_RESP_FAILURE; + result = QI_RESP_INVALID; address = (u64)req->addr << VTD_PAGE_SHIFT; if (!req->pasid_present) { pr_err("%s: Page request without PASID: %08llx %08llx\n", @@ -952,7 +950,6 @@ static irqreturn_t prq_event_thread(int irq, void *d) rcu_read_unlock(); } - result = QI_RESP_INVALID; /* Since we're using init_mm.pgd directly, we should never take * any faults on kernel addresses. */ if (!svm->mm) -- 2.25.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu