From patchwork Wed Jun 28 22:53:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Srinivas Pandruvada X-Patchwork-Id: 697622 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ED9F4EB64D7 for ; Wed, 28 Jun 2023 22:54:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229524AbjF1Wyk (ORCPT ); Wed, 28 Jun 2023 18:54:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230060AbjF1Wyi (ORCPT ); Wed, 28 Jun 2023 18:54:38 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61F1126B9; Wed, 28 Jun 2023 15:54:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1687992876; x=1719528876; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=Iki1tAwHsT0InDXDuJ03LNhaQB1nSzzHCxO6ym/RF98=; b=FA1ceeOI1N5oayzbg4g51EtVigTVRp2Fb0EGnBGLGvqsCXOApO1TVUVz 1XU2kZ8RK3Jg077ufxUKD8Ann55fCjktiOU3PdqoZpuVcWPOojZcB+zB1 wdAPUOhKdYt/Y8oecHb+yd3sbOuLY6xVI8CMwAObp9xbNErDqzlRFGDpj iA/XnhVvi3uQsaAB8XjWCAm3iFR3UK9LEYM09D2S0LZg3hxR0K0t9w5XC /htWmHwSxXbDtrtSbzxoqElqK0AAFFu/gGJy0l/Eg6GMjQtFzuJ1JjCoc 5X5VeD1afJPcN8LBxtAFNBySKt5Z2wxCNxVLgpUaEIN1+MYS0/jPmW7ft w==; X-IronPort-AV: E=McAfee;i="6600,9927,10755"; a="365438758" X-IronPort-AV: E=Sophos;i="6.01,166,1684825200"; d="scan'208";a="365438758" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jun 2023 15:54:28 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10755"; a="891206357" X-IronPort-AV: E=Sophos;i="6.01,166,1684825200"; d="scan'208";a="891206357" Received: from spandruv-desk.jf.intel.com ([10.54.75.8]) by orsmga005.jf.intel.com with ESMTP; 28 Jun 2023 15:54:28 -0700 From: Srinivas Pandruvada To: rafael@kernel.org, lenb@kernel.org, viresh.kumar@linaro.org Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Srinivas Pandruvada Subject: [PATCH] cpufreq: intel_pstate: Fix scaling for hybrid capable system with disabled E-cores Date: Wed, 28 Jun 2023 15:53:41 -0700 Message-Id: <20230628225341.3718351-1-srinivas.pandruvada@linux.intel.com> X-Mailer: git-send-email 2.39.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Some system BIOS configuration may provide option to disable E-cores. As part of this change, CPUID feature for hybrid (Leaf 7 sub leaf 0, EDX[15] = 0) may not be set. But HWP performance limits will still be using a scaling factor like any other hybrid enabled system. The current check for applying scaling factor will fail when hybrid CPUID feature is not set. Only way to make sure that scaling should be applied by checking CPPC nominal frequency and nominal performance. If CPPC nominal frequency and nominal performance is defined and nominal frequency is not in multiples of 100MHz of nominal performance, then use hybrid scaling factor. The above check will fail for non hybrid capable systems as they don't publish nominal frequency field in CPPC, so this function can be used for all HWP systems without additional cpu model check. Signed-off-by: Srinivas Pandruvada --- drivers/cpufreq/intel_pstate.c | 59 ++++++++++++++++++++++++++++------ 1 file changed, 49 insertions(+), 10 deletions(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 2548ec92faa2..b562ed7c4f37 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -330,6 +330,13 @@ static bool intel_pstate_get_ppc_enable_status(void) return acpi_ppc; } +#define HYBRID_SCALING_FACTOR 78741 + +static inline int core_get_scaling(void) +{ + return 100000; +} + #ifdef CONFIG_ACPI_CPPC_LIB /* The work item is needed to avoid CPU hotplug locking issues */ @@ -400,10 +407,35 @@ static int intel_pstate_get_cppc_guaranteed(int cpu) return cppc_perf.nominal_perf; } + +static int intel_pstate_cppc_get_scaling(int cpu) +{ + struct cppc_perf_caps cppc_perf; + int ret; + + ret = cppc_get_perf_caps(cpu, &cppc_perf); + + /* + * Check if nominal frequency is multiples of 100 MHz, if + * not return hybrid scaling factor. + */ + if (!ret && cppc_perf.nominal_perf && cppc_perf.nominal_freq && + (cppc_perf.nominal_perf * 100 != cppc_perf.nominal_freq)) + return HYBRID_SCALING_FACTOR; + + return core_get_scaling(); +} + #else /* CONFIG_ACPI_CPPC_LIB */ static inline void intel_pstate_set_itmt_prio(int cpu) { } + +static int intel_pstate_cppc_get_scaling(int cpu) +{ + return core_get_scaling(); +} + #endif /* CONFIG_ACPI_CPPC_LIB */ static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) @@ -1895,11 +1927,6 @@ static int core_get_turbo_pstate(int cpu) return ret; } -static inline int core_get_scaling(void) -{ - return 100000; -} - static u64 core_get_val(struct cpudata *cpudata, int pstate) { u64 val; @@ -1936,16 +1963,29 @@ static void hybrid_get_type(void *data) *cpu_type = get_this_hybrid_cpu_type(); } -static int hybrid_get_cpu_scaling(int cpu) +static int hwp_get_cpu_scaling(int cpu) { u8 cpu_type = 0; smp_call_function_single(cpu, hybrid_get_type, &cpu_type, 1); /* P-cores have a smaller perf level-to-freqency scaling factor. */ if (cpu_type == 0x40) - return 78741; + return HYBRID_SCALING_FACTOR; - return core_get_scaling(); + /* Use default core scaling for E-cores */ + if (cpu_type == 0x20) + return core_get_scaling(); + + /* + * If reached here, it means that, this system is either non + * hybrid system (like Tiger Lake) or hybrid capable system (like + * Alder Lake or Raptor Lake) with no E cores (CPUID for hybrid + * support is 0). + * All non hybrid systems, don't publish nominal_frequency + * field (means nominal frequency = 0), In that case + * the legacy core scaling is used. + */ + return intel_pstate_cppc_get_scaling(cpu); } static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate) @@ -3393,8 +3433,7 @@ static int __init intel_pstate_init(void) if (!default_driver) default_driver = &intel_pstate; - if (boot_cpu_has(X86_FEATURE_HYBRID_CPU)) - pstate_funcs.get_cpu_scaling = hybrid_get_cpu_scaling; + pstate_funcs.get_cpu_scaling = hwp_get_cpu_scaling; goto hwp_cpu_matched; }