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To: Karel Zak , Jeremy Linton Cc: util-linux@vger.kernel.org References: <20250711211648.53361-1-paul@os.amperecomputing.com> <20250711211648.53361-2-paul@os.amperecomputing.com> Content-Language: en-US From: Paul Benoit In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SJ0PR03CA0189.namprd03.prod.outlook.com (2603:10b6:a03:2ef::14) To SA1PR01MB8179.prod.exchangelabs.com (2603:10b6:806:330::14) Precedence: bulk X-Mailing-List: util-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA1PR01MB8179:EE_|SJ2PR01MB8005:EE_ X-MS-Office365-Filtering-Correlation-Id: 7ff6c121-1410-470e-1161-08de1e44490d X-MS-Exchange-AtpMessageProperties: SA X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|52116014|366016|38350700014; X-Microsoft-Antispam-Message-Info: =?utf-8?B?Sk1wS3dKWlIvL01PK0tIZEdpMjVNM2QvTU9RaFVhWURuZmlqZVBPeWRNWFAr?= =?utf-8?B?RTRibDA0aWs2WmVzSWhDbGJ6NTZMN0NmNy9Oa3Z1K1ZWeHkwakxZeGhTWHIw?= =?utf-8?B?UHdFKzY4QnhBdzdkbDhSWDMzRGlkOUFYT3liOVFsSVFCcmhESzVmUUw4bXJL?= =?utf-8?B?VkM4UkQwOXZabUN1R2dMRDZXOVhxQXhJbFJYRURNVUFVdEs4bWc2Nkd6ZkpF?= =?utf-8?B?L2VvQ0FZTHFNNXJ4d0Y5bVRZZStyUFIrVGNTdFdqVG9OcTFubG9YZFpzYmcw?= =?utf-8?B?VVR5Rk5hYmY2TnRwaW16UUk0ajZzWDFqdEs5bXNzaG9lK25yRW5TNUYxU1B6?= =?utf-8?B?eS9PL1pSeXFVald4bWY0SWNWcVBOdkZEblo3VEJUVkNZeG9SQWIrOVNacnVB?= =?utf-8?B?Q0RrNThvT1dmMnJLL25oRU5hK2kxaUVJMkFHKy9mTFlDbFozVXh0R3Z0Z2pj?= =?utf-8?B?bjNBaTBKRHhlazhpY2JCQjJCd3lhQ3dCUTJMSkYrU2NmOXFQakF6VlNYWjZZ?= =?utf-8?B?NERsRGt3akRpWWk1WlpTNjA2Zkl6NnN5Z29OeHFnQXFCbW80V01YRDV3SUZ6?= =?utf-8?B?TmlySm15ZmtuZ1pjY3FaRG03cFhSWkpUcDdlT3dTT01Nb1Z3Q0hVY0dYcnBS?= =?utf-8?B?amdqUW9PakdlcGs3aGRpTmR2TmV4ZTFtbFpxWkdaTnRwakphWndVT2dBWlVi?= =?utf-8?B?MHRVNHZsa0tQcnc2eXZlR3lOSm5hQmpveGtXekd4cEJVODBhTFlYRGhVeTJZ?= =?utf-8?B?N3UyTUk3aUdhUVNrcUVQcmlHekcrVnk5SEpONkhGWHFPODUxbXFpQk90aXVK?= =?utf-8?B?MU8rbHljSlBKM0haZVQ4cnpwMkJSYWVWWUFxQVZPMTRjczg1cUhQMWs4OElP?= =?utf-8?B?L3R1bUQ2bS9od3lINUt3WWlFUFhFN1VYUnVDbDRnaTNRZ1Flemx2YWtkS3Ro?= =?utf-8?B?dk43RElQYVpwMFhxYlMyVDJmNVBxVUM5Z2V2OEFEVStvdG1LUlhIb2srZytM?= =?utf-8?B?SXA5MkNxNDF2MmxKTHBRbVVwcDlNM3VGVldhbFdYa3JMb2hueXluTWZDL2JK?= =?utf-8?B?QUJwa2dRSVlNTnVMT2NUVXR3dkZMRkJEdTNtZk9vK2hLanlRTXludDZUVkFu?= =?utf-8?B?M25nV1drajdVd2paaXJTR3JhZVB3Qm52YW9uTWJVZXRsaEFPRURyL2c1S0tB?= =?utf-8?B?MUNYcm9acGc2c0lPNDZmaHB6N0dReTRTblRzM2QwL3FnbVNsSVRXcGM4ZVBQ?= =?utf-8?B?aFBoUk5DeGN2bUVSWU1LOU0vazd0SE1FWUFOZnZxTkFNTW4vekNvejJlQ3pD?= =?utf-8?B?WmMyMzE0eUs5ZVZiZGp0RVMvc0o2Ukk5YUFOamdNaHBUUldtQ3Z0NUhhQisx?= =?utf-8?B?NnlwRTVUM2djZ2NjaEFBQnd0Z05xTVZYc0t4THQvemRBb1dXWjVTdHhzZkxH?= =?utf-8?B?SUJjU3YzQmJ4T01YZFQ0RkYwTkFyTEVOVjJDSlNDRHJ3cHRkMHZLM2xqcWEz?= =?utf-8?B?TGdsbHNUMVZzbnR5NTZPZ1ZpYUpPRkduS3pMTkJlS0Y4RUVkWndhN2Zxeit4?= =?utf-8?B?alhyc2d2WUZGQWpvK0gxRlJxL2hXd3ZrSUh0cEN4b3FMb0h6TFdGNktPZkky?= =?utf-8?B?UVlSQlpZbDFyOHArSVZWaE9sc0FxRUYxL25xQXcrdkFGK25URkxrOFZ0a1pk?= =?utf-8?B?dy9QYnRxVVJUUHAyQkdPU3NXOVo5aHZVQldPWDR1RWp0TGxRb0ErR3JKekZp?= =?utf-8?B?ckpTblBWRkIrTWFhRENrR3YvRWJxZ2xQMVFvTnRCL3ZVbnFCalhDYWJNYjVy?= =?utf-8?B?N0pocnE4ai9ZS2M0T3R5OFIyWjdzczZvYm16c2tmVy9tQUJQMStBNnlhd3Ja?= =?utf-8?B?d05hL3IwUHd6RVJXRW5sMGJwclR4UGgrSkZ3OWY5UHJBenZzTEl1a0ZpOXU0?= =?utf-8?B?UytUSUZOQ3VwTlpKWVBCL0FjZjBDa0Z6MkNJUVVEeUU1NzdUQmZVdlcxcXVR?= =?utf-8?B?RG0xOUhXODVsd0JEbmx2ZVZrTmlKTFl3K25mdExuMFdSa2c0UG5FMndpZG5Q?= =?utf-8?Q?JnXNGi?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SA1PR01MB8179.prod.exchangelabs.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(1800799024)(52116014)(366016)(38350700014);DIR:OUT;SFP:1102; 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On newer Ampere Computing systems, the >>>> system/model name will be obtained from /sys/bus/soc/devices/soc0/machine, >>>> that is populated with the ARM SMC CC SOC_ID Name. >>> >>> If I understand correctly, there are old systems without >>> /sys/.../soc0/machine, right? The change will remove Ampere-1a from >>> the lscpu output. This sounds backward incompatible. >> >> Thats a good point, but as I understand it, Ampere hasn't been happy with >> the string that is there. > > We can update the string to make them happy. > >> If its OK to break whatever scripts/etc might depend on it at the moment, >> why not just update the string. >> >> Then invert the check so that the /sys/bus entry is preferred? > > I still do not understand how a per-CPU identifier can be replaced by > one soc0 path. What if there is soc1, soc2, etc.? Yes, I agree that /sys/bus/soc/devices/soc0/machine shouldn't be used for processors/cpus in soc1..socn unless all physical SOCs are mapped by soc0. My recollection is that I only saw the one /sys/bus/devices/soc0 on an SMC compliant system with 2 SOCs. The smccc_soc_init routine is what calls soc_device_register once. The support code for other ARM SOCs call soc_device_register from a *_probe routine (run once per SOC?). As per my other reply in this thread today, /sys/bus/soc/devices/soc0/machine will only be used for a SMC CC compliant SOC. > > Anyway, using /sys/bus as the primary source and the hardcoded id_part[] > array as a fallback seems better than removing anything from id_part[] > and relying on /sys/bus only. > > Karel >