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Sat, 16 Nov 2024 00:35:22 +0000 Message-ID: Date: Fri, 15 Nov 2024 16:35:19 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 15/26] x86/resctrl: Add data structures and definitions for ABMC assignment To: Babu Moger , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <219cac124638f576cc7a9c5a14207f8c018e31f1.1730244116.git.babu.moger@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <219cac124638f576cc7a9c5a14207f8c018e31f1.1730244116.git.babu.moger@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4PR04CA0302.namprd04.prod.outlook.com (2603:10b6:303:82::7) 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_|PH7PR11MB6955:EE_ X-MS-Office365-Filtering-Correlation-Id: 9198288e-32a8-41ec-9ead-08dd05d68e1b 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|376014|7416014|1800799024|366016; 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The bandwidth events will be tracked by the hardware > until the user changes the configuration. Each resctrl group can configure > maximum two counters, one for total event and one for local event. > > The ABMC feature implements an MSR L3_QOS_ABMC_CFG (C000_03FDh). > Configuration is done by setting the counter id, bandwidth source (RMID) > and bandwidth configuration supported by BMEC (Bandwidth Monitoring Event > Configuration). > > Attempts to read or write the MSR when ABMC is not enabled will result > in a #GP(0) exception. > > Introduce the data structures and definitions for MSR L3_QOS_ABMC_CFG > (0xC000_03FDh): > ========================================================================= > Bits Mnemonic Description Access Reset > Type Value > ========================================================================= > 63 CfgEn Configuration Enable R/W 0 > > 62 CtrEn Enable/disable counting R/W 0 > > 61:53 – Reserved MBZ 0 > > 52:48 CtrID Counter Identifier R/W 0 > > 47 IsCOS BwSrc field is a CLOSID R/W 0 > (not an RMID) > > 46:44 – Reserved MBZ 0 > > 43:32 BwSrc Bandwidth Source R/W 0 > (RMID or CLOSID) > > 31:0 BwType Bandwidth configuration R/W 0 > to track for this counter > ========================================================================== > > 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