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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 CCC24C2D0A8 for ; Wed, 23 Sep 2020 16:19:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D00520B1F for ; Wed, 23 Sep 2020 16:19:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726518AbgIWQTq (ORCPT ); Wed, 23 Sep 2020 12:19:46 -0400 Received: from mga05.intel.com ([192.55.52.43]:28354 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726130AbgIWQTq (ORCPT ); Wed, 23 Sep 2020 12:19:46 -0400 IronPort-SDR: J8qDqiGezPFYziI4CxYSR6QAda2NWSb0ou2ycnZLtuyFortbgj+BBNHNOhhuTezWmxTwdXUlql 9nNSWxgl1dyQ== X-IronPort-AV: E=McAfee;i="6000,8403,9753"; a="245765135" X-IronPort-AV: E=Sophos;i="5.77,293,1596524400"; d="scan'208";a="245765135" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Sep 2020 09:19:46 -0700 IronPort-SDR: n84VaKhwCX5sjOasLfcX9sZZSHECuBqTrA0blMYILMmYzE0Pj4T36LW9qYLGnfatmwHQT9Y+ru ISUKaQw7HwbA== X-IronPort-AV: E=Sophos;i="5.77,293,1596524400"; d="scan'208";a="486496324" Received: from otc-nc-03.jf.intel.com (HELO otc-nc-03) ([10.54.39.36]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Sep 2020 09:19:45 -0700 Date: Wed, 23 Sep 2020 09:19:44 -0700 From: "Raj, Ashok" To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, Kai-Heng Feng , Joerg Roedel , Lalithambika Krishnakumar , Lu Baolu , Mika Westerberg , Keith Busch , Jens Axboe , Christoph Hellwig , Sagi Grimberg , Rajat Jain , linux-nvme@lists.infradead.org, iommu@lists.linux-foundation.org, Ashok Raj Subject: Re: [bugzilla-daemon@bugzilla.kernel.org: [Bug 209149] New: "iommu/vt-d: Enable PCI ACS for platform opt in hint" makes NVMe config space not accessible after S3] Message-ID: <20200923161944.GA17764@otc-nc-03> References: <20200923160327.GA2267374@bjorn-Precision-5520> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200923160327.GA2267374@bjorn-Precision-5520> User-Agent: Mutt/1.5.24 (2015-08-30) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Hi Bjorn On Wed, Sep 23, 2020 at 11:03:27AM -0500, Bjorn Helgaas wrote: > [+cc IOMMU and NVMe folks] > > Sorry, I forgot to forward this to linux-pci when it was first > reported. > > Apparently this happens with v5.9-rc3, and may be related to > 50310600ebda ("iommu/vt-d: Enable PCI ACS for platform opt in hint"), > which appeared in v5.8-rc3. > > There are several dmesg logs and proposed patches in the bugzilla, but > no analysis yet of what the problem is. From the first dmesg > attachment (https://bugzilla.kernel.org/attachment.cgi?id=292327): We have been investigating this internally as well. It appears maybe the specupdate for Cometlake is missing the errata documention. The offsets were wrong in some of them, and if its the same issue its likely cause. Will nudge the hw folks to hunt that down :-(. Cheers, Ashok