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Wed, 19 Feb 2025 22:14:32 +0000 Message-ID: Date: Wed, 19 Feb 2025 14:14:29 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 07/42] x86/resctrl: Add max_bw to struct resctrl_membw To: James Morse , , CC: Thomas Gleixner , Ingo Molnar , Borislav Petkov , H Peter Anvin , Babu Moger , , "D Scott Phillips OS" , , , , , , Jamie Iles , Xin Hao , , , , David Hildenbrand , Rex Nie , "Dave Martin" , Koba Ko , Shanker Donthineni , Shaopeng Tan , "Tony Luck" References: <20250207181823.6378-1-james.morse@arm.com> <20250207181823.6378-8-james.morse@arm.com> Content-Language: en-US From: Reinette Chatre In-Reply-To: <20250207181823.6378-8-james.morse@arm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR02CA0022.namprd02.prod.outlook.com (2603:10b6:303:16d::15) To SN7PR11MB7566.namprd11.prod.outlook.com (2603:10b6:806:34d::7) 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: SN7PR11MB7566:EE_|SJ0PR11MB5024:EE_ X-MS-Office365-Filtering-Correlation-Id: cb83c8e1-d40f-4f6a-1284-08dd5132c94a 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|366016|1800799024|7053199007; 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This is because the > MBA schema works differently between these platforms. Doing this > complicates determining whether the default_ctrl property belongs > to the arch code, or can be derived from the schema format. > > Deriving the maximum or default value from the schema format would > avoid the architecture code having to tell resctrl such obvious > things as the maximum percentage is 100, and the maximum bitmap > is all ones. > > Maximum bandwidth is always going to vary per platform. Add > max_bw as a special case. This is currently used for the maximum > MBA percentage on Intel platforms, but can be removed from the > architecture code if 'percentage' becomes a schema format resctrl > supports directly. > > This value isn't needed for other schema formats. > > This will allow the default_ctrl to be generated from the schema > properties when it is needed. > > Signed-off-by: James Morse > Tested-by: Carl Worth # arm64 > Tested-by: Shaopeng Tan > Reviewed-by: Shaopeng Tan > Reviewed-by: Tony Luck > --- Reviewed-by: Reinette Chatre Reinette