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Wed, 30 Jul 2025 19:50:31 +0000 Message-ID: <642ff1fc-3a79-4aff-b226-599d1a089516@intel.com> Date: Wed, 30 Jul 2025 12:50:28 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v16 16/34] x86,fs/resctrl: Implement resctrl_arch_config_cntr() to assign a counter with ABMC To: Babu Moger , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <5ce91d983fdb22648e13727866b0b5ebe1428b32.1753467772.git.babu.moger@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <5ce91d983fdb22648e13727866b0b5ebe1428b32.1753467772.git.babu.moger@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0064.namprd03.prod.outlook.com (2603:10b6:303:b6::9) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|DS0PR11MB6422:EE_ X-MS-Office365-Filtering-Correlation-Id: 5beadf04-a17e-4a62-b17e-08ddcfa25770 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014|7053199007; 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The > hardware continues to track the assigned counter until it is explicitly > unassigned by the user. > > Implement an x86 architecture-specific handler to configure a counter. This > architecture specific handler is called by resctrl fs when a counter is > assigned or unassigned as well as when an already assigned counter's > configuration should be updated. Configure counters by writing to the > L3_QOS_ABMC_CFG MSR, specifying the counter ID, bandwidth source (RMID), > and event configuration. > > The feature details are documented in the APM listed below [1]. > [1] AMD64 Architecture Programmer's Manual Volume 2: System Programming > Publication # 24593 Revision 3.41 section 19.3.3.3 Assignable Bandwidth > Monitoring (ABMC). > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 > Signed-off-by: Babu Moger > --- Reviewed-by: Reinette Chatre Reinette