From patchwork Sat Apr 23 04:03:53 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: srinivas pandruvada X-Patchwork-Id: 8916901 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 [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 873C89F372 for ; Sat, 23 Apr 2016 04:07:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9BB5D20123 for ; Sat, 23 Apr 2016 04:07:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A6B8720172 for ; Sat, 23 Apr 2016 04:07:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750895AbcDWEHT (ORCPT ); Sat, 23 Apr 2016 00:07:19 -0400 Received: from mga04.intel.com ([192.55.52.120]:16104 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750757AbcDWEHS (ORCPT ); Sat, 23 Apr 2016 00:07:18 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga104.fm.intel.com with ESMTP; 22 Apr 2016 21:07:15 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,520,1455004800"; d="scan'208";a="951183616" Received: from spandruv-mobl3.jf.intel.com ([10.255.231.180]) by fmsmga001.fm.intel.com with ESMTP; 22 Apr 2016 21:07:15 -0700 From: Srinivas Pandruvada To: khlebnikov@yandex-team.ru Cc: linux-pm@vger.kernel.org, Srinivas Pandruvada Subject: [PATCH v2 3/3] cpufreq: intel_pstate: Enable PPC enforcement for servers Date: Fri, 22 Apr 2016 21:03:53 -0700 Message-Id: <1461384233-24214-4-git-send-email-srinivas.pandruvada@linux.intel.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1461384233-24214-1-git-send-email-srinivas.pandruvada@linux.intel.com> References: <1461384233-24214-1-git-send-email-srinivas.pandruvada@linux.intel.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-7.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham 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 For platforms which are controlled via remove node manager, enable _PPC by default. These platforms are mostly categorized as enterprise server or performance servers. These platforms needs to go through some certifications tests, which tests control via _PPC. The relative risk of enabling by default is low as this is is less likely that these systems have broken _PSS table. Signed-off-by: Srinivas Pandruvada --- Documentation/kernel-parameters.txt | 5 ++++- drivers/cpufreq/intel_pstate.c | 14 ++++++++++++-- 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 4199a1b..52292b2 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1662,7 +1662,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted. Only load intel_pstate on systems which support hardware P state control (HWP) if available. support_acpi_ppc - Enforce ACPI _PPC performance limits. + Enforce ACPI _PPC performance limits. If the Fixed ACPI + Description Table, specifies preferred power management + profile as "Enterprise Server" or "Performance Server", + then this feature is turned on by default. 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 c9cc72d..eb5f1ec 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -345,6 +345,16 @@ static struct perf_limits *limits = &powersave_limits; #endif #ifdef CONFIG_ACPI + +static bool intel_pstate_get_ppc_enable_status(void) +{ + if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER || + acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER) + return true; + + return acpi_ppc; +} + /* * The max target pstate ratio is a 8 bit value in both PLATFORM_INFO MSR and * in TURBO_RATIO_LIMIT MSR, which pstate driver stores in max_pstate and @@ -368,8 +378,8 @@ static int intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) int ret; int i; - if (!acpi_ppc) - return 0; /* this is optional flag, so no error returned */ + if (!intel_pstate_get_ppc_enable_status()) + return 0; /* this is optional, so no error returned */ cpu = all_cpu_data[policy->cpu];