From patchwork Fri Nov 28 03:36:16 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: ethan zhao X-Patchwork-Id: 5401181 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id BD1B89F1BD for ; Fri, 28 Nov 2014 03:37:34 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C061B20138 for ; Fri, 28 Nov 2014 03:37:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E40E82012D for ; Fri, 28 Nov 2014 03:37:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751252AbaK1DhF (ORCPT ); Thu, 27 Nov 2014 22:37:05 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:31560 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751502AbaK1DhC (ORCPT ); Thu, 27 Nov 2014 22:37:02 -0500 Received: from ucsinet21.oracle.com (ucsinet21.oracle.com [156.151.31.93]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id sAS3apXv027927 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 28 Nov 2014 03:36:52 GMT Received: from userz7022.oracle.com (userz7022.oracle.com [156.151.31.86]) by ucsinet21.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id sAS3ao3Q018656 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 28 Nov 2014 03:36:50 GMT Received: from abhmp0004.oracle.com (abhmp0004.oracle.com [141.146.116.10]) by userz7022.oracle.com (8.14.5+Sun/8.14.4) with ESMTP id sAS3anXX027832; Fri, 28 Nov 2014 03:36:49 GMT Received: from localhost.localdomain.com (/10.182.70.25) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 27 Nov 2014 19:36:49 -0800 From: Ethan Zhao To: dirk.j.brandewie@intel.com, viresh.kumar@linaro.org, rjw@rjwysocki.net, corbet@lwn.net Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, ethan.kernel@gmail.com, joe.jin@oracle.com, brian.maly@oracle.com, Ethan Zhao Subject: [PATCH 2/2 V6] intel_pstate: add kernel parameter to force loading on Sun X86 servers. Date: Fri, 28 Nov 2014 12:36:16 +0900 Message-Id: <1417145777-21897-3-git-send-email-ethan.zhao@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1417145777-21897-1-git-send-email-ethan.zhao@oracle.com> References: <1417145777-21897-1-git-send-email-ethan.zhao@oracle.com> X-Source-IP: ucsinet21.oracle.com [156.151.31.93] Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP To force loading on Oracle Sun X86 servers, provide one kernel command line parameter intel_pstate = ora_force For those who be aware of the risk of no power capping capabily working and try to get better performance with this driver. Signed-off-by: Ethan Zhao --- v2: change to hardware vendor specific naming parameter. v4: refine code and doc. v5&v6: fix a typo in doc. Documentation/kernel-parameters.txt | 5 +++++ drivers/cpufreq/intel_pstate.c | 6 +++++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 479f332..7d0983e 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1446,6 +1446,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted. disable Do not enable intel_pstate as the default scaling driver for the supported processors + ora_force + Force loading intel_pstate on Oracle Sun Servers(X86). + only for those who be aware of the risk of no power capping + capability working and try to get better performance with this + driver. intremap= [X86-64, Intel-IOMMU] on enable Interrupt Remapping (default) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 1bb62ca..2654e13 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -866,6 +866,7 @@ static struct cpufreq_driver intel_pstate_driver = { }; static int __initdata no_load; +static unsigned int ora_force; static int intel_pstate_msrs_not_valid(void) { @@ -1003,7 +1004,8 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void) case PSS: return intel_pstate_no_acpi_pss(); case PCC: - return intel_pstate_has_acpi_ppc(); + return intel_pstate_has_acpi_ppc() && + (!ora_force); } } @@ -1078,6 +1080,8 @@ static int __init intel_pstate_setup(char *str) if (!strcmp(str, "disable")) no_load = 1; + if (!strcmp(str, "ora_force")) + ora_force = 1; return 0; } early_param("intel_pstate", intel_pstate_setup);