From patchwork Wed Mar 2 08:16:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Artem Bityutskiy X-Patchwork-Id: 547731 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 18F42C4332F for ; Wed, 2 Mar 2022 08:16:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229518AbiCBIQu (ORCPT ); Wed, 2 Mar 2022 03:16:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240031AbiCBIQt (ORCPT ); Wed, 2 Mar 2022 03:16:49 -0500 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1BEA1B7C44 for ; Wed, 2 Mar 2022 00:16:06 -0800 (PST) X-IronPort-AV: E=McAfee;i="6200,9189,10273"; a="314058971" X-IronPort-AV: E=Sophos;i="5.90,148,1643702400"; d="scan'208";a="314058971" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Mar 2022 00:16:05 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.90,148,1643702400"; d="scan'208";a="510913512" Received: from powerlab.fi.intel.com (HELO powerlab..) ([10.237.71.25]) by orsmga006.jf.intel.com with ESMTP; 02 Mar 2022 00:16:04 -0800 From: Artem Bityutskiy To: "Rafael J. Wysocki" Cc: Linux PM Mailing List , chang.seok.bae@intel.com Subject: [PATCH v1 3/3] intel_idle: add core C6 optimization for SPR Date: Wed, 2 Mar 2022 10:16:00 +0200 Message-Id: <20220302081600.1751716-3-dedekind1@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220302081600.1751716-1-dedekind1@gmail.com> References: <20220302081600.1751716-1-dedekind1@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Artem Bityutskiy Add a Sapphire Rapids Xeon C6 optimization, similar to what we have for Sky Lake Xeon: if package C6 is disabled, adjust C6 exit latency and target residency to match core C6 values, instead of using the default package C6 values. Signed-off-by: Artem Bityutskiy --- drivers/idle/intel_idle.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index b2688c326522..e385ddf15b32 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -1578,6 +1578,8 @@ static void __init skx_idle_state_table_update(void) */ static void __init spr_idle_state_table_update(void) { + unsigned long long msr; + /* Check if user prefers C1E over C1. */ if (preferred_states_mask & BIT(2)) { if (preferred_states_mask & BIT(1)) @@ -1591,6 +1593,19 @@ static void __init spr_idle_state_table_update(void) c1e_promotion_enable(); disable_promotion_to_c1e = false; } + + /* + * By default, the C6 state assumes the worst-case scenario of package + * C6. However, if PC6 is disabled, we update the numbers to match + * core C6. + */ + rdmsrl(MSR_PKG_CST_CONFIG_CONTROL, msr); + + /* Limit value 2 and above allow for PC6. */ + if ((msr & 0x7) < 2) { + spr_cstates[2].exit_latency = 190; + spr_cstates[2].target_residency = 600; + } } static bool __init intel_idle_verify_cstate(unsigned int mwait_hint)