From patchwork Tue Nov 18 08:27:29 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: ethan zhao X-Patchwork-Id: 5326281 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 6297A9F1E1 for ; Tue, 18 Nov 2014 08:30:12 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8E6702017A for ; Tue, 18 Nov 2014 08:30:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9996420176 for ; Tue, 18 Nov 2014 08:30:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753892AbaKRI2p (ORCPT ); Tue, 18 Nov 2014 03:28:45 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:32937 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753718AbaKRI2o (ORCPT ); Tue, 18 Nov 2014 03:28:44 -0500 Received: from ucsinet22.oracle.com (ucsinet22.oracle.com [156.151.31.94]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id sAI8SaT3020271 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 18 Nov 2014 08:28:37 GMT Received: from userz7022.oracle.com (userz7022.oracle.com [156.151.31.86]) by ucsinet22.oracle.com (8.14.5+Sun/8.14.5) with ESMTP id sAI8Saoh020651 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 18 Nov 2014 08:28:36 GMT Received: from abhmp0016.oracle.com (abhmp0016.oracle.com [141.146.116.22]) by userz7022.oracle.com (8.14.5+Sun/8.14.4) with ESMTP id sAI8SZYU020516; Tue, 18 Nov 2014 08:28:35 GMT Received: from localhost.localdomain.com (/10.182.70.25) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 18 Nov 2014 00:28:34 -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] intel_pstate: add module and kernel command line parameter to ignore ACPI _PPC Date: Tue, 18 Nov 2014 17:27:29 +0900 Message-Id: <1416299253-14912-4-git-send-email-ethan.zhao@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1416299253-14912-1-git-send-email-ethan.zhao@oracle.com> References: <1416299253-14912-1-git-send-email-ethan.zhao@oracle.com> X-Source-IP: ucsinet22.oracle.com [156.151.31.94] 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 Add kernel command line parameter intel_pstate = ignore_acpi_ppc and module parameter ignore_acpi_ppc = 1 to allow driver to ignore the ACPI _PPC existence even for Sun x86 servers. These parameter could be used for debug\test\workaround etc purpose. Signed-off-by: Ethan Zhao --- Documentation/kernel-parameters.txt | 3 +++ drivers/cpufreq/intel_pstate.c | 8 +++++++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 4c81a86..f502b85 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1446,6 +1446,9 @@ 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 + ignore_acpi_ppc + Ignore the existence of ACPI method _PPC for Sun x86 servers + and load the 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 7c5faea..388387b 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -870,6 +870,7 @@ static struct cpufreq_driver intel_pstate_driver = { }; static int __initdata no_load; +static unsigned int ignore_acpi_ppc; static int intel_pstate_msrs_not_valid(void) { @@ -990,7 +991,7 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void) intel_pstate_no_acpi_pss()) return true; if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && - intel_pstate_has_acpi_ppc()) + intel_pstate_has_acpi_ppc() && !ignore_acpi_ppc) return true; } @@ -1066,11 +1067,16 @@ static int __init intel_pstate_setup(char *str) if (!strcmp(str, "disable")) no_load = 1; + if (!strcmp(str, "ignore_acpi_ppc")) + ignore_acpi_ppc = 1; return 0; } early_param("intel_pstate", intel_pstate_setup); #endif +module_param(ignore_acpi_ppc, uint, 0644); +MODULE_PARM_DESC(ignore_acpi_ppc, + "value 0 or non-zero. non-zero -> ignore ACPI _PPC and load this driver"); MODULE_AUTHOR("Dirk Brandewie "); MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); MODULE_LICENSE("GPL");