From patchwork Fri Jan 15 09:47:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Rui X-Patchwork-Id: 364927 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 105D3C433DB for ; Fri, 15 Jan 2021 09:37:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C44AA22A84 for ; Fri, 15 Jan 2021 09:37:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727696AbhAOJgx (ORCPT ); Fri, 15 Jan 2021 04:36:53 -0500 Received: from mga14.intel.com ([192.55.52.115]:38898 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726652AbhAOJgw (ORCPT ); Fri, 15 Jan 2021 04:36:52 -0500 IronPort-SDR: aI+/has4LV6qC+eTLFm+RfnXhWSdjndiPQziv/TRwfZuAlwCaFfbl4tMkdArz6Wum7krLJfwuA hJNnGeai4e4A== X-IronPort-AV: E=McAfee;i="6000,8403,9864"; a="177747256" X-IronPort-AV: E=Sophos;i="5.79,349,1602572400"; d="scan'208";a="177747256" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jan 2021 01:36:20 -0800 IronPort-SDR: LLxmZCnZzLY8SYSKds3LuVI1ZZrZZ95+qHhkPkE3NX2b9+hJj4NHJu/xUTLnjp0GniQVrT6yu2 fPlD9Gt0FZSA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.79,349,1602572400"; d="scan'208";a="425253586" Received: from power-sh.sh.intel.com ([10.239.48.130]) by orsmga001.jf.intel.com with ESMTP; 15 Jan 2021 01:36:17 -0800 From: Zhang Rui To: linux-pm@vger.kernel.org Cc: rui.zhang@intel.com, daniel.lezcano@linaro.org, srinivas.pandruvada@linux.intel.com Subject: [PATCH] thermal/intel: introduce tcc cooling driver Date: Fri, 15 Jan 2021 17:47:44 +0800 Message-Id: <20210115094744.21156-1-rui.zhang@intel.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On Intel processors, the core frequency can be reduced below OS request, when the current temperature reaches the TCC (Thermal Control Circuit) activation temperature. The default TCC activation temperature is specified by MSR_IA32_TEMPERATURE_TARGET. However, it can be adjusted by specifying an offset in degrees C, using the TCC Offset bits in the same MSR register. This patch introduces a cooling devices driver that utilizes the TCC Offset feature. The bigger the current cooling state is, the lower the effective TCC activation temperature is, so that the processors can be throttled earlier before system critical overheats. This patch has been tested on a KBL mobile platform. Signed-off-by: Zhang Rui --- drivers/thermal/intel/Kconfig | 8 ++ drivers/thermal/intel/Makefile | 1 + drivers/thermal/intel/intel_tcc_cooling.c | 128 ++++++++++++++++++++++ 3 files changed, 137 insertions(+) create mode 100644 drivers/thermal/intel/intel_tcc_cooling.c diff --git a/drivers/thermal/intel/Kconfig b/drivers/thermal/intel/Kconfig index 8025b21f43fa..67de49cc9fb4 100644 --- a/drivers/thermal/intel/Kconfig +++ b/drivers/thermal/intel/Kconfig @@ -75,3 +75,11 @@ config INTEL_PCH_THERMAL Enable this to support thermal reporting on certain intel PCHs. Thermal reporting device will provide temperature reading, programmable trip points and other information. + +config INTEL_TCC_COOLING + tristate "Intel TCC offset cooling Driver" + depends on X86 + help + Enable this to support system cooling by adjusting the effective TCC + activation temperature via the TCC Offset register, which is widely + supported on modern Intel platforms. diff --git a/drivers/thermal/intel/Makefile b/drivers/thermal/intel/Makefile index 0d9736ced5d4..40e86973f88d 100644 --- a/drivers/thermal/intel/Makefile +++ b/drivers/thermal/intel/Makefile @@ -10,3 +10,4 @@ obj-$(CONFIG_INTEL_QUARK_DTS_THERMAL) += intel_quark_dts_thermal.o obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/ obj-$(CONFIG_INTEL_BXT_PMIC_THERMAL) += intel_bxt_pmic_thermal.o obj-$(CONFIG_INTEL_PCH_THERMAL) += intel_pch_thermal.o +obj-$(CONFIG_INTEL_TCC_COOLING) += intel_tcc_cooling.o diff --git a/drivers/thermal/intel/intel_tcc_cooling.c b/drivers/thermal/intel/intel_tcc_cooling.c new file mode 100644 index 000000000000..aa6bbb9ba898 --- /dev/null +++ b/drivers/thermal/intel/intel_tcc_cooling.c @@ -0,0 +1,128 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * cooling device driver that activates the processor throttling by + * programming the TCC Offset register. + * Copyright (c) 2021, Intel Corporation. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include + +#define TCC_SHIFT 24 +#define TCC_MASK (0x3fULL<<24) +#define TCC_PROGRAMMABLE BIT(30) + +static struct thermal_cooling_device *tcc_cdev; + +static int tcc_get_max_state(struct thermal_cooling_device *cdev, unsigned long + *state) +{ + *state = TCC_MASK >> TCC_SHIFT; + return 0; +} + +static int tcc_offset_update(int tcc) +{ + u64 val; + int err; + + err = rdmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, &val); + if (err) + return err; + + val &= ~TCC_MASK; + val |= tcc << TCC_SHIFT; + + err = wrmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, val); + if (err) + return err; + + return 0; +} + +static int tcc_get_cur_state(struct thermal_cooling_device *cdev, unsigned long + *state) +{ + u64 val; + int err; + + err = rdmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, &val); + if (err) + return err; + + *state = (val & TCC_MASK) >> TCC_SHIFT; + return 0; +} + +static int tcc_set_cur_state(struct thermal_cooling_device *cdev, unsigned long + state) +{ + return tcc_offset_update(state); +} + +static const struct thermal_cooling_device_ops tcc_cooling_ops = { + .get_max_state = tcc_get_max_state, + .get_cur_state = tcc_get_cur_state, + .set_cur_state = tcc_set_cur_state, +}; + +static const struct x86_cpu_id tcc_ids[] __initconst = { + X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, NULL), + X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, NULL), + X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, NULL), + X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, NULL), + X86_MATCH_INTEL_FAM6_MODEL(ICELAKE, NULL), + X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_L, NULL), + X86_MATCH_INTEL_FAM6_MODEL(TIGERLAKE, NULL), + X86_MATCH_INTEL_FAM6_MODEL(TIGERLAKE_L, NULL), + {} +}; + +MODULE_DEVICE_TABLE(x86cpu, tcc_ids); + +static int __init tcc_cooling_init(void) +{ + int ret; + u64 val; + const struct x86_cpu_id *id; + + int err; + + id = x86_match_cpu(tcc_ids); + if (!id) + return -ENODEV; + + err = rdmsrl_safe(MSR_PLATFORM_INFO, &val); + if (err) + return err; + + if (!(val & TCC_PROGRAMMABLE)) + return -ENODEV; + + pr_info("Programmable TCC Offset detected\n"); + + tcc_cdev = + thermal_cooling_device_register("TCC Offset", NULL, + &tcc_cooling_ops); + if (IS_ERR(tcc_cdev)) { + ret = PTR_ERR(tcc_cdev); + return ret; + } + return 0; +} + +module_init(tcc_cooling_init) + +static void __exit tcc_cooling_exit(void) +{ + thermal_cooling_device_unregister(tcc_cdev); +} + +module_exit(tcc_cooling_exit) + +MODULE_DESCRIPTION("TCC offset cooling device Driver"); +MODULE_AUTHOR("Zhang Rui "); +MODULE_LICENSE("GPL v2");