From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756807AbcKVUZ1 (ORCPT ); Tue, 22 Nov 2016 15:25:27 -0500 Received: from mga04.intel.com ([192.55.52.120]:28060 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933083AbcKVUZZ (ORCPT ); Tue, 22 Nov 2016 15:25:25 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,682,1473145200"; d="scan'208";a="34464150" From: Tim Chen To: rjw@rjwysocki.net, tglx@linutronix.de, mingo@redhat.com, bp@suse.de Cc: "Rafael J. Wysocki" , x86@kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, peterz@infradead.org, Tim Chen , jolsa@redhat.com, Srinivas Pandruvada Subject: [PATCH v8 8/8] cpufreq: intel_pstate: Use CPPC to get max performance Date: Tue, 22 Nov 2016 12:24:00 -0800 Message-Id: <0998b98943bcdec7d1ddd4ff27358da555ea8e92.1479844244.git.tim.c.chen@linux.intel.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Rafael J. Wysocki" This change uses acpi cppc_lib interface to get CPPC performance limits and calls scheduler interface to update per cpu highest priority. If there is a difference in highest performance of each CPUs, call scheduler interface to enable ITMT feature for only one time. Here sched_set_itmt_core_prio() is called to set priorities and sched_set_itmt_support() is called to enable ITMT feature. Co-developed-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki Signed-off-by: Tim Chen --- drivers/cpufreq/Kconfig.x86 | 1 + drivers/cpufreq/intel_pstate.c | 56 +++++++++++++++++++++++++++++++++++++++++- 2 files changed, 56 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86 index adbd1de..c6d273b 100644 --- a/drivers/cpufreq/Kconfig.x86 +++ b/drivers/cpufreq/Kconfig.x86 @@ -6,6 +6,7 @@ config X86_INTEL_PSTATE bool "Intel P state control" depends on X86 select ACPI_PROCESSOR if ACPI + select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_ITMT help This driver provides a P state for Intel core processors. The driver implements an internal governor and will become diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 4737520..e8dc42f 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -44,6 +44,7 @@ #ifdef CONFIG_ACPI #include +#include #endif #define FRAC_BITS 8 @@ -379,14 +380,67 @@ static bool intel_pstate_get_ppc_enable_status(void) return acpi_ppc; } +#ifdef CONFIG_ACPI_CPPC_LIB + +/* The work item is needed to avoid CPU hotplug locking issues */ +static void intel_pstste_sched_itmt_work_fn(struct work_struct *work) +{ + sched_set_itmt_support(); +} + +static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn); + +static void intel_pstate_set_itmt_prio(int cpu) +{ + struct cppc_perf_caps cppc_perf; + static u32 max_highest_perf = 0, min_highest_perf = U32_MAX; + int ret; + + ret = cppc_get_perf_caps(cpu, &cppc_perf); + if (ret) + return; + + /* + * The priorities can be set regardless of whether or not + * sched_set_itmt_support(true) has been called and it is valid to + * update them at any time after it has been called. + */ + sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu); + + if (max_highest_perf <= min_highest_perf) { + if (cppc_perf.highest_perf > max_highest_perf) + max_highest_perf = cppc_perf.highest_perf; + + if (cppc_perf.highest_perf < min_highest_perf) + min_highest_perf = cppc_perf.highest_perf; + + if (max_highest_perf > min_highest_perf) { + /* + * This code can be run during CPU online under the + * CPU hotplug locks, so sched_set_itmt_support() + * cannot be called from here. Queue up a work item + * to invoke it. + */ + schedule_work(&sched_itmt_work); + } + } +} +#else +static void intel_pstate_set_itmt_prio(int cpu) +{ +} +#endif + static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) { struct cpudata *cpu; int ret; int i; - if (hwp_active) + if (hwp_active) { + intel_pstate_set_itmt_prio(policy->cpu); return; + } if (!intel_pstate_get_ppc_enable_status()) return; -- 2.5.5