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Wysocki" , Huang Rui CC: , , , , Shuah Khan , , "Nathan Fontenot" , Deepak Sharma , Alex Deucher , Mario Limonciello , Shimmer Huang , "Perry Yuan" , Xiaojian Du , Viresh Kumar , Borislav Petkov , "Oleksandr Natalenko" , Meng Li , Wyes Karny Subject: [PATCH V9 2/7] acpi: cppc: Add get the highest performance cppc control Date: Fri, 13 Oct 2023 10:57:36 +0800 Message-ID: <20231013025741.3332520-3-li.meng@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231013025741.3332520-1-li.meng@amd.com> References: <20231013025741.3332520-1-li.meng@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044F5:EE_|PH7PR12MB5853:EE_ X-MS-Office365-Filtering-Correlation-Id: 540aa639-883f-452d-9732-08dbcb983cb0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: BI5K7RfbfAnmQLVAy2m5ZqE03TXMrhqZOdlOcjqq5RbeivNCFFlyv+v0+i+Gag9ee6R+kEd9lurPMZOAUimSHRdIwiiCVgv10bBoVG0p9rgDR0wXMGUsiItPd+PBnst2ak6IF2adDMqkoChLDQ73pLrHXRX4fpYOqUMLEK6ezx0L+u5VDtKNdiMg80hed0ozaX38WBKC6GpUL1N8h6/7gLiMFLEb8UBKbGXDSpqdHAqoq0kgbGpkRJuOF44hE49z2orLRYr9J++r3dXcGyGXV4DeJxkiA6fsVcsNgd3KpqGIPKKtLjVuOf99mCRC4UnInTvxBcR02qe+o/aMsS3Dp0Y7y41xHXCon4x9qvQmygPjNQPetJysgh9pkAaUh0dhTpFamKE6tTKPZqpP0ka536w0yGsKWH3y2YyyE02e+E14t6E+yMJPM1LaoK6Ehm1nm9YpxgVDxcJF+ard5YsQbAF6cWWIDHSmIi+sYG5C9h4WsBAq0i09DAGhwF4pfSkCQvZMqjPKPZuNgnoSjOB/Ljx7ks+NYsykIR7Jzp9WJdh0ybZjpHlzwUR3udBoggGugXCE4mODzrWgDTajlLi5BvT2nVrzBj1l7S69FR1xZ6qcjL1slwzlyTT2Qg41lSM70SiLO1DSbZrTapCza20+Y9QygGDSpeKEzEthwpgn9YsPzcb9L07QjFtZV+3EDvVoQ/r6I4UyDcBp3g5L0H1nQ7RaTB9tb62AhjKev7EHIwM40EVkRvyXLOG8t7ZVLn1aIzC4cNKpAmLfBBnUZmtXyekHKodmMd+kdF/FmChs12I= X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230031)(4636009)(376002)(346002)(396003)(136003)(39860400002)(230922051799003)(451199024)(186009)(82310400011)(64100799003)(1800799009)(40470700004)(46966006)(36840700001)(426003)(26005)(336012)(70206006)(40480700001)(54906003)(5660300002)(36756003)(36860700001)(6666004)(478600001)(47076005)(86362001)(7696005)(41300700001)(1076003)(40460700003)(356005)(316002)(6636002)(82740400003)(70586007)(7416002)(966005)(8936002)(4326008)(2906002)(81166007)(8676002)(2616005)(110136005)(16526019)(15583001)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Oct 2023 02:58:11.5324 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 540aa639-883f-452d-9732-08dbcb983cb0 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000044F5.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5853 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add support for getting the highest performance to the generic CPPC driver. This enables downstream drivers such as amd-pstate to discover and use these values. Please refer to the ACPI_Spec for details on continuous performance control of CPPC. Tested-by: Oleksandr Natalenko Reviewed-by: Mario Limonciello Reviewed-by: Wyes Karny Acked-by: Huang Rui Signed-off-by: Meng Li Link: https://uefi.org/specs/ACPI/6.5/08_Processor_Configuration_and_Control.html?highlight=cppc#highest-performance --- drivers/acpi/cppc_acpi.c | 13 +++++++++++++ include/acpi/cppc_acpi.h | 5 +++++ 2 files changed, 18 insertions(+) diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 7ff269a78c20..ad388a0e8484 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -1154,6 +1154,19 @@ int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf) return cppc_get_perf(cpunum, NOMINAL_PERF, nominal_perf); } +/** + * cppc_get_highest_perf - Get the highest performance register value. + * @cpunum: CPU from which to get highest performance. + * @highest_perf: Return address. + * + * Return: 0 for success, -EIO otherwise. + */ +int cppc_get_highest_perf(int cpunum, u64 *highest_perf) +{ + return cppc_get_perf(cpunum, HIGHEST_PERF, highest_perf); +} +EXPORT_SYMBOL_GPL(cppc_get_highest_perf); + /** * cppc_get_epp_perf - Get the epp register value. * @cpunum: CPU from which to get epp preference value. diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h index 6126c977ece0..c0b69ffe7bdb 100644 --- a/include/acpi/cppc_acpi.h +++ b/include/acpi/cppc_acpi.h @@ -139,6 +139,7 @@ struct cppc_cpudata { #ifdef CONFIG_ACPI_CPPC_LIB extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf); extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf); +extern int cppc_get_highest_perf(int cpunum, u64 *highest_perf); extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); extern int cppc_set_enable(int cpu, bool enable); @@ -165,6 +166,10 @@ static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf) { return -ENOTSUPP; } +static inline int cppc_get_highest_perf(int cpunum, u64 *highest_perf) +{ + return -ENOTSUPP; +} static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs) { return -ENOTSUPP; From patchwork Fri Oct 13 02:57:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Meng, Li \(Jassmine\)" X-Patchwork-Id: 733806 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 D90D4C41513 for ; Fri, 13 Oct 2023 02:58:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229550AbjJMC6e (ORCPT ); Thu, 12 Oct 2023 22:58:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229553AbjJMC6d (ORCPT ); Thu, 12 Oct 2023 22:58:33 -0400 Received: from NAM02-BN1-obe.outbound.protection.outlook.com (mail-bn1nam02on2077.outbound.protection.outlook.com [40.107.212.77]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A7230106; 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Wysocki" , Huang Rui CC: , , , , Shuah Khan , , "Nathan Fontenot" , Deepak Sharma , Alex Deucher , Mario Limonciello , Shimmer Huang , "Perry Yuan" , Xiaojian Du , Viresh Kumar , Borislav Petkov , "Oleksandr Natalenko" , Meng Li Subject: [PATCH V9 4/7] cpufreq: Add a notification message that the highest perf has changed Date: Fri, 13 Oct 2023 10:57:38 +0800 Message-ID: <20231013025741.3332520-5-li.meng@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231013025741.3332520-1-li.meng@amd.com> References: <20231013025741.3332520-1-li.meng@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044F5:EE_|PH7PR12MB7819:EE_ X-MS-Office365-Filtering-Correlation-Id: 7d881ec1-ff1f-475f-9f28-08dbcb9842cc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230031)(4636009)(396003)(376002)(39860400002)(346002)(136003)(230922051799003)(186009)(451199024)(1800799009)(82310400011)(64100799003)(40470700004)(36840700001)(46966006)(7696005)(83380400001)(36860700001)(47076005)(16526019)(82740400003)(40460700003)(336012)(426003)(40480700001)(7416002)(86362001)(4326008)(2906002)(15650500001)(5660300002)(966005)(8676002)(26005)(8936002)(6666004)(110136005)(316002)(70586007)(70206006)(6636002)(54906003)(41300700001)(36756003)(1076003)(356005)(81166007)(2616005)(478600001)(226483002)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Oct 2023 02:58:21.7512 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7d881ec1-ff1f-475f-9f28-08dbcb9842cc X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000044F5.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7819 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org ACPI 6.5 section 8.4.6.1.1.1 specifies that Notify event 0x85 can be emmitted to cause the the OSPM to re-evaluate the highest performance register. Add support for this event. Tested-by: Oleksandr Natalenko Reviewed-by: Mario Limonciello Reviewed-by: Huang Rui Signed-off-by: Meng Li Link: https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#processor-device-notification-values --- drivers/acpi/processor_driver.c | 6 ++++++ drivers/cpufreq/cpufreq.c | 13 +++++++++++++ include/linux/cpufreq.h | 5 +++++ 3 files changed, 24 insertions(+) diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 4bd16b3f0781..29b2fb68a35d 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -27,6 +27,7 @@ #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 +#define ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED 0x85 MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION("ACPI Processor Driver"); @@ -83,6 +84,11 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) acpi_bus_generate_netlink_event(device->pnp.device_class, dev_name(&device->dev), event, 0); break; + case ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED: + cpufreq_update_highest_perf(pr->id); + acpi_bus_generate_netlink_event(device->pnp.device_class, + dev_name(&device->dev), event, 0); + break; default: acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); break; diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 60ed89000e82..4ada787ff105 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -2718,6 +2718,19 @@ void cpufreq_update_limits(unsigned int cpu) } EXPORT_SYMBOL_GPL(cpufreq_update_limits); +/** + * cpufreq_update_highest_perf - Update highest performance for a given CPU. + * @cpu: CPU to update the highest performance for. + * + * Invoke the driver's ->update_highest_perf callback if present + */ +void cpufreq_update_highest_perf(unsigned int cpu) +{ + if (cpufreq_driver->update_highest_perf) + cpufreq_driver->update_highest_perf(cpu); +} +EXPORT_SYMBOL_GPL(cpufreq_update_highest_perf); + /********************************************************************* * BOOST * *********************************************************************/ diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 71d186d6933a..1cc1241fb698 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -235,6 +235,7 @@ int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); void refresh_frequency_limits(struct cpufreq_policy *policy); void cpufreq_update_policy(unsigned int cpu); void cpufreq_update_limits(unsigned int cpu); +void cpufreq_update_highest_perf(unsigned int cpu); bool have_governor_per_policy(void); bool cpufreq_supports_freq_invariance(void); struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); @@ -263,6 +264,7 @@ static inline bool cpufreq_supports_freq_invariance(void) return false; } static inline void disable_cpufreq(void) { } +static inline void cpufreq_update_highest_perf(unsigned int cpu) { } #endif #ifdef CONFIG_CPU_FREQ_STAT @@ -380,6 +382,9 @@ struct cpufreq_driver { /* Called to update policy limits on firmware notifications. */ void (*update_limits)(unsigned int cpu); + /* Called to update highest performance on firmware notifications. */ + void (*update_highest_perf)(unsigned int cpu); + /* optional */ int (*bios_limit)(int cpu, unsigned int *limit); From patchwork Fri Oct 13 02:57:40 2023 Content-Type: text/plain; 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Wysocki" , Huang Rui CC: , , , , Shuah Khan , , "Nathan Fontenot" , Deepak Sharma , Alex Deucher , Mario Limonciello , Shimmer Huang , "Perry Yuan" , Xiaojian Du , Viresh Kumar , Borislav Petkov , "Oleksandr Natalenko" , Meng Li , Wyes Karny Subject: [PATCH V9 6/7] Documentation: amd-pstate: introduce amd-pstate preferred core Date: Fri, 13 Oct 2023 10:57:40 +0800 Message-ID: <20231013025741.3332520-7-li.meng@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231013025741.3332520-1-li.meng@amd.com> References: <20231013025741.3332520-1-li.meng@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044F3:EE_|SA3PR12MB9200:EE_ X-MS-Office365-Filtering-Correlation-Id: bd6e18d7-1a6a-4a95-1cfe-08dbcb9848cb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230031)(4636009)(346002)(39860400002)(396003)(376002)(136003)(230922051799003)(82310400011)(186009)(451199024)(1800799009)(64100799003)(36840700001)(40470700004)(46966006)(4326008)(8936002)(8676002)(54906003)(70586007)(6666004)(70206006)(6636002)(316002)(7696005)(5660300002)(26005)(2616005)(478600001)(16526019)(336012)(426003)(1076003)(41300700001)(110136005)(40460700003)(47076005)(83380400001)(36860700001)(40480700001)(82740400003)(81166007)(2906002)(356005)(7416002)(36756003)(86362001)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Oct 2023 02:58:31.8076 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bd6e18d7-1a6a-4a95-1cfe-08dbcb9848cb X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000044F3.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB9200 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Introduce amd-pstate preferred core. check preferred core state set by the kernel parameter: $ cat /sys/devices/system/cpu/amd-pstate/prefcore Tested-by: Oleksandr Natalenko Reviewed-by: Wyes Karny Reviewed-by: Mario Limonciello Reviewed-by: Huang Rui Signed-off-by: Meng Li --- Documentation/admin-guide/pm/amd-pstate.rst | 59 ++++++++++++++++++++- 1 file changed, 57 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 1cf40f69278c..0b832ff529db 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -300,8 +300,8 @@ platforms. The AMD P-States mechanism is the more performance and energy efficiency frequency management method on AMD processors. -AMD Pstate Driver Operation Modes -================================= +``amd-pstate`` Driver Operation Modes +====================================== ``amd_pstate`` CPPC has 3 operation modes: autonomous (active) mode, non-autonomous (passive) mode and guided autonomous (guided) mode. @@ -353,6 +353,48 @@ is activated. In this mode, driver requests minimum and maximum performance level and the platform autonomously selects a performance level in this range and appropriate to the current workload. +``amd-pstate`` Preferred Core +================================= + +The core frequency is subjected to the process variation in semiconductors. +Not all cores are able to reach the maximum frequency respecting the +infrastructure limits. Consequently, AMD has redefined the concept of +maximum frequency of a part. This means that a fraction of cores can reach +maximum frequency. To find the best process scheduling policy for a given +scenario, OS needs to know the core ordering informed by the platform through +highest performance capability register of the CPPC interface. + +``amd-pstate`` preferred core enables the scheduler to prefer scheduling on +cores that can achieve a higher frequency with lower voltage. The preferred +core rankings can dynamically change based on the workload, platform conditions, +thermals and ageing. + +The priority metric will be initialized by the ``amd-pstate`` driver. The ``amd-pstate`` +driver will also determine whether or not ``amd-pstate`` preferred core is +supported by the platform. + +``amd-pstate`` driver will provide an initial core ordering when the system boots. +The platform uses the CPPC interfaces to communicate the core ranking to the +operating system and scheduler to make sure that OS is choosing the cores +with highest performance firstly for scheduling the process. When ``amd-pstate`` +driver receives a message with the highest performance change, it will +update the core ranking and set the cpu's priority. + +``amd-pstate`` Preferred Core Switch +================================= +Kernel Parameters +----------------- + +``amd-pstate`` peferred core`` has two states: enable and disable. +Enable/disable states can be chosen by different kernel parameters. +Default enable ``amd-pstate`` preferred core. + +``amd_prefcore=disable`` + +For systems that support ``amd-pstate`` preferred core, the core rankings will +always be advertised by the platform. But OS can choose to ignore that via the +kernel parameter ``amd_prefcore=disable``. + User Space Interface in ``sysfs`` - General =========================================== @@ -385,6 +427,19 @@ control its functionality at the system level. They are located in the to the operation mode represented by that string - or to be unregistered in the "disable" case. +``prefcore`` + Preferred core state of the driver: "enabled" or "disabled". + + "enabled" + Enable the ``amd-pstate`` preferred core. + + "disabled" + Disable the ``amd-pstate`` preferred core + + + This attribute is read-only to check the state of preferred core set + by the kernel parameter. + ``cpupower`` tool support for ``amd-pstate`` ===============================================