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charset=UTF-8 Date: Thu, 05 Mar 2026 16:26:52 +0900 Message-Id: Cc: , "Miguel Ojeda" , "Boqun Feng" , "Gary Guo" , "Benno Lossin" , "Andreas Hindborg" , "Alice Ryhl" , "Trevor Gross" , "Danilo Krummrich" , "Dave Airlie" , , , , "Nikola Djukic" , Subject: Re: [PATCH v8 25/25] gpu: nova-core: mm: Add PRAMIN aperture self-tests From: "Alexandre Courbot" To: "Joel Fernandes" References: <855853e7-f9cc-4661-bb62-c8d4fff86a76@nvidia.com> In-Reply-To: <855853e7-f9cc-4661-bb62-c8d4fff86a76@nvidia.com> X-ClientProxiedBy: TY4PR01CA0018.jpnprd01.prod.outlook.com (2603:1096:405:2bf::7) To CH2PR12MB3990.namprd12.prod.outlook.com (2603:10b6:610:28::18) 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: CH2PR12MB3990:EE_|CH3PR12MB7692:EE_ X-MS-Office365-Filtering-Correlation-Id: d1856c95-c7bf-4b03-83ef-08de7a889435 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|10070799003|1800799024|366016; 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I thought PRAMIN was also working on Hopper+. Isn't it >> orthogonal to the kind of MMU used? > > The PRAMIN aperture window register changed on Hopper+: pre-Hopper uses > NV_PBUS_BAR0_WINDOW while Hopper+ uses NV_XAL_EP_BAR0_WINDOW. Our > current code only programs the former, so we'd need a HAL to support > both. For now, V2-only is the safe choice. I've updated the comment to > explain this. I see, but then it seems that the correct check would be against the `Chips= et`, not the version of the page table format? I understand the two are linked transitively, but they are in practice different engines.