Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754058AbaK0Igq (ORCPT ); Thu, 27 Nov 2014 03:36:46 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:51960 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753344AbaK0IgX (ORCPT ); Thu, 27 Nov 2014 03:36:23 -0500 From: Ethan Zhao To: dirk.j.brandewie@intel.com, linda.knippers@hp.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, Ethan Zhao Subject: [PATCH 2/2 V4] intel_pstate: add kernel parameter to force loading on Sun X86 servers. Date: Thu, 27 Nov 2014 17:35:32 +0900 Message-Id: <1417077332-7453-3-git-send-email-ethan.zhao@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1417077332-7453-1-git-send-email-ethan.zhao@oracle.com> References: <1417077332-7453-1-git-send-email-ethan.zhao@oracle.com> X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. 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 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); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/