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=-6.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 8167EC433E7 for ; Tue, 13 Oct 2020 02:47:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 31AF4221FE for ; Tue, 13 Oct 2020 02:47:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727799AbgJMCrL (ORCPT ); Mon, 12 Oct 2020 22:47:11 -0400 Received: from mga11.intel.com ([192.55.52.93]:47364 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726511AbgJMCrL (ORCPT ); Mon, 12 Oct 2020 22:47:11 -0400 IronPort-SDR: QTnGytfAimFJ/fInIh9pZVaxFXplMI1IrwMOrjx3IFwDA5HfdTrF0VY+reRXfu30mIpLr6+9UY P12NdABuvYng== X-IronPort-AV: E=McAfee;i="6000,8403,9772"; a="162369330" X-IronPort-AV: E=Sophos;i="5.77,369,1596524400"; d="scan'208";a="162369330" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Oct 2020 19:47:10 -0700 IronPort-SDR: VrElMgCHa10hJ0BqiwV0Zn2AeyH+FZsRVjS+WBMaP8OuVvVoqp0hRXd0cgz2pb3RcbDYeOuJ0Z ABsx9ComjLew== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,369,1596524400"; d="scan'208";a="520882246" Received: from otcwcpicx6.sc.intel.com ([172.25.55.29]) by fmsmga005.fm.intel.com with ESMTP; 12 Oct 2020 19:47:10 -0700 From: Fenghua Yu To: "Borislav Petkov" , "Thomas Gleixner" , "Ingo Molnar" , "Stephane Eranian" , "Tony Luck" , "Reinette Chatre" , "Ravi V Shankar" Cc: "linux-kernel" , "x86" , Fenghua Yu Subject: [PATCH v2 0/2] x86/resctrl: Workaround MBM errata Date: Tue, 13 Oct 2020 02:46:54 +0000 Message-Id: <20201013024656.700492-1-fenghua.yu@intel.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Intel Memory Bandwidth Monitoring (MBM) counters may report system memory bandwidth incorrectly on some Intel processors. The errata are reported in erratum SKX99 [1], erratum BDF102 [2] and RDT reference manual [3]. The errata are worked around using a correction factor table. Since the correction factor table is not publicly documented anywhere, it's documented in Documentation/x86/resctrl.rst along with the errata. 1. Erratum SKX99 in Intel Xeon Processor Scalable Family Specification Update: http://web.archive.org/web/20200716124958/https://www.intel.com/content/www/us/en/processors/xeon/scalable/xeon-scalable-spec-update.html 2. Erratum BDF102 in Intel Xeon E5-2600 v4 Processor Product Family Specification Update: http://web.archive.org/web/20191125200531/https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/xeon-e5-v4-spec-update.pdf 3. The errata in Intel Resource Director Technology (Intel RDT) on 2nd Generation Intel Xeon Scalable Processors Reference Manual: https://software.intel.com/content/www/us/en/develop/articles/intel-resource-director-technology-rdt-reference-manual.html Change Log: v2: - Document the errata and the correction table in resctrl.rst (Boris). - Address various comments on patch 2 (Boris). - Change the documentation URLs to stable archive.org (Tony). Fenghua Yu (2): Documentation: x86: Rename resctrl_ui.rst and add two errata to the file x86/resctrl: Correct MBM total and local values Documentation/conf.py | 2 +- Documentation/x86/index.rst | 2 +- .../x86/{resctrl_ui.rst => resctrl.rst} | 82 ++++++++++++++++++ arch/x86/kernel/cpu/resctrl/core.c | 4 + arch/x86/kernel/cpu/resctrl/internal.h | 1 + arch/x86/kernel/cpu/resctrl/monitor.c | 83 ++++++++++++++++++- 6 files changed, 170 insertions(+), 4 deletions(-) rename Documentation/x86/{resctrl_ui.rst => resctrl.rst} (92%) -- 2.28.0