From patchwork Mon Mar 17 14:54:29 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Artem Bityutskiy X-Patchwork-Id: 14019638 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A2BDB1C861C for ; Mon, 17 Mar 2025 14:54:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742223274; cv=none; b=odQ66dr3WXWRN/R54gaHBNDKfZZHJjHawO8vNoYaShe6wFEq3S4vBcA5DYI/mbiCzikVRHQlYFucH1nWcKiD1wsNn0h6fKrEV3HkKtQoaK9d6vuwQ9jmt/ENa83mMYrYYgHf/MT3iLsNf87HPfEjtRtiyyeY307mxd9HMUJ3IPM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742223274; c=relaxed/simple; bh=SMdfojPdC+WWjxgfc5tO1ZAAMB55YjJ8tIY4qjK1aro=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=SPg7VkZaHXrmCR53yljLbtLtWMrpyUwFwsPP7qE1lYd9zogr91bCioyoL/oE0qKbmETv92A/4r0IVlDpPfk9gCN8Rq28N5KK2e7GCRO/5aU+LiBaAXlUldtljI/9vvoNfzrG4tGlkEvqsILirI2nIktvXxdxVEzf6BUOxqgWEcU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com; spf=fail smtp.mailfrom=gmail.com; arc=none smtp.client-ip=198.175.65.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=gmail.com X-CSE-ConnectionGUID: Q5lrX2KyTXSlhXA2MPSjew== X-CSE-MsgGUID: OhZTWXCvTHybu/kM+ET/iw== X-IronPort-AV: E=McAfee;i="6700,10204,11376"; a="60711785" X-IronPort-AV: E=Sophos;i="6.14,254,1736841600"; d="scan'208";a="60711785" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Mar 2025 07:54:32 -0700 X-CSE-ConnectionGUID: zQr1KsKvR+eRXuOLop4aPg== X-CSE-MsgGUID: L2pYiJd5TLSs/vW/dx2fGQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.14,254,1736841600"; d="scan'208";a="121682631" Received: from powerlab.fi.intel.com (HELO powerlab.backendnet) ([10.237.71.25]) by orviesa009.jf.intel.com with ESMTP; 17 Mar 2025 07:54:31 -0700 From: Artem Bityutskiy To: "Rafael J. Wysocki" Cc: Linux PM Mailing List Subject: [RFC PATCH v2 0/1] Add a header for MSR_PKG_CST_CONFIG_CONTROL Date: Mon, 17 Mar 2025 16:54:29 +0200 Message-ID: <20250317145430.2153013-1-dedekind1@gmail.com> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Artem Bityutskiy Implement a suggestion from Rafael Wysocki. Previous version of the RFC: https://lore.kernel.org/linux-pm/20250220154306.2166129-1-dedekind1@gmail.com/T/#t The suggestion is to add a common helper for switching the C1 demotion feature on/off via MSR_PKG_CST_CONFIG_CONTROL. Still RFC because I feel like the common helper is not universal enough, because the bit number was different on the Lincroft platform, and the MSR is not architectural, so may change from platform to platform. Therefore, just to linux-pm as RFC so far, and as a single patch. This patch applies on top of the following patch-set that I sent to linux-pm a bit earlier today: Subject: [PATCH v3 0/3] intel_idle: Add C1 demotion on/off sysfs knob Link: https://lore.kernel.org/linux-pm/20250317135541.1471754-1-dedekind1@gmail.com/T/#t Artem Bityutskiy (1): x86: msr: add 'msr_pkg_cst_config_control.h' header .../include/asm/msr_pkg_cst_config_control.h | 41 +++++++++++++++++++ drivers/idle/intel_idle.c | 10 +---- drivers/platform/x86/intel/pmc/cnp.c | 7 ++-- 3 files changed, 46 insertions(+), 12 deletions(-) create mode 100644 arch/x86/include/asm/msr_pkg_cst_config_control.h