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Thu, 23 Oct 2025 17:45:59 +0000 Message-ID: <1d9b83e6-48b3-4e62-a9aa-09947013c907@intel.com> Date: Thu, 23 Oct 2025 10:45:57 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 23/31] x86/resctrl: Add energy/perf choices to rdt boot option To: Tony Luck , Fenghua Yu , "Maciej Wieczor-Retman" , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu CC: , , References: <20251013223348.103390-1-tony.luck@intel.com> <20251013223348.103390-24-tony.luck@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20251013223348.103390-24-tony.luck@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4P223CA0005.NAMP223.PROD.OUTLOOK.COM (2603:10b6:303:80::10) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|CH3PR11MB7323:EE_ X-MS-Office365-Filtering-Correlation-Id: 9fc2c21d-08a1-4b78-6417-08de125c0678 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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These > may be overridden by quirks to disable features in the case of errata. > Users can use kernel command line options to either disable a feature, > or to force enable a feature that was disabled by a quirk. > > Provide similar functionality for hardware features that do not have an > X86_FEATURE_* flag. Unlike other features that are tied to X86_FEATURE_* > flags, these must be queried by name. Add rdt_is_feature_enabled() > to check whether quirks or kernel command line have disabled a feature. > > Users may force a feature to be disabled. E.g. "rdt=!perf" will ensure > that none of the perf telemetry events are enabled. > > Resctrl architecture code may disable a feature that does not provide > full functionality. Users may override that decision. E.g. "rdt=energy" > will enable any available energy telemetry events even if they do not > provide full functionality. > > Signed-off-by: Tony Luck > --- Reviewed-by: Reinette Chatre Reinette