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charset=UTF-8 Date: Fri, 22 Aug 2025 22:31:12 +0900 Message-Id: Cc: , Subject: Re: [PATCH v2 0/5] Rust infrastructure for sg_table and scatterlist From: "Alexandre Courbot" To: "Danilo Krummrich" , , , , , , , , , , , , , , , X-Mailer: aerc 0.20.1-0-g2ecb8770224a-dirty References: <20250820165431.170195-1-dakr@kernel.org> In-Reply-To: <20250820165431.170195-1-dakr@kernel.org> X-ClientProxiedBy: TY2PR06CA0004.apcprd06.prod.outlook.com (2603:1096:404:42::16) To CH2PR12MB3990.namprd12.prod.outlook.com (2603:10b6:610:28::18) Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR12MB3990:EE_|IA0PR12MB7721:EE_ X-MS-Office365-Filtering-Correlation-Id: db57d6ad-f19b-4fdd-f944-08dde1802aff X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|10070799003|1800799024|376014|7416014|366016|921020; X-Microsoft-Antispam-Message-Info: =?utf-8?B?VmZ0QmROYmxYRS9nSnZhalNHUWN0NWFVUmRVOXgyeldGcDJlbVhqbDM5RTdT?= =?utf-8?B?dHRJRjBVeHJ4bnRPbHNRazZiSWt2ekljNEg0a2ZBVStuS0JrSkFCY1BzeDV2?= =?utf-8?B?WTZ4N1N3WE4zR2NmR3g0enZ1NkxTWkJ3TXRJdkRIQlpVNmVuTXZVQjhsQkhS?= =?utf-8?B?eld2bGRzU1ZFQzFvVHZyY0tRMnNadWJlY0J3MG1Pa280L2ltRzY4RHcyRGt1?= =?utf-8?B?MFdCeGtYRmJyZTBYNnlXUW5lbEhjbVhqVU8wKzJBd1czOXpZUk9qWlp4dzhv?= =?utf-8?B?YStsZUdWMnp1NTNlb1RBQVc1NmNGNysyUVArV3FyLy9RNm92OVU0VlpSVU8z?= =?utf-8?B?c3JKaWJsTUpFa1Q2RFVYcTI1RlBWcjhPYWd5NUxLbmhPRDZmWS91NGdhdVh1?= =?utf-8?B?bFpoTjFzU2hIcnRIWWRiNisvcGRtZXQ2b295L3B6dVErM3F6dWZCNDF5dkh5?= =?utf-8?B?aXJYaG1oSFRlUG9WekNMQXp6SUduZjY5ZkNIOHR5QmpDRUJIbElMKzBnSEZ5?= =?utf-8?B?c3hBaS9CV2pCN2R2bmJQR1pzd2xYZlpWOElMNGdqd0JXYzhrRWZuRk9hUW5u?= =?utf-8?B?MWtXeUg5eWJZUXhROWgwbFV0eTVkYXZhM3V5TkgyWmZObUdaWE1ZN0RpQlph?= =?utf-8?B?WStuNCtmazhTbTJVbnZqb2paTWZYd2s4Vlp5bm9JbjNxclVVV2RCVXVOeUtR?= =?utf-8?B?V09Kd0hPNlkyM1h1SjlMS2xNME9samZCdUxIRmNDYXdKTnUwbTZuSGlYUGl2?= =?utf-8?B?djNIeVJUQ1BIaWN6QkdvV3VtOHRqQWozMFMzc2R6MnBERGFNREx1U1U1Z3Bw?= =?utf-8?B?YlpRZVhaZXo5TTZVdmgxazhBa2tqR3FuRjBaR3YvY2Z2ZHNYTjZDMFp0d1Z6?= =?utf-8?B?eFo4MWdqQ0FJdFFhSFp0VzkvQk5TSXBNejBpS1laV25kS2FScEMwWHkrZmpw?= =?utf-8?B?OXlQOThINlJZVjNTa2ZXQkFGN3BHcldicWRwVytDaFB3eFhha0xjNjZvdFJo?= =?utf-8?B?QU84d1VacVd1SFJscG1UVVFXNjBJbDlLeFhSUE9veTVPYmVyMzNXMS9DaFg3?= =?utf-8?B?YjV0K0E0UzRGcXV4VW5ORTdwUXdBZTdrYW9yUXovLzhtNCttV20zL3pUckQ4?= =?utf-8?B?UUFjSlQycWFVVmhWVnBPbDRKTm8vRkFBVG1Fc3NOdjcxSnRucFRDVjNLOWRi?= =?utf-8?B?bU9hYkJHNkNOVEcxY3RRZTUxOWo1Qi90YVAwTVlFN3U5Qk1VVlhndWpnL3dz?= =?utf-8?B?Wm5BcDk2eEtvZzlGMTQveFFLRHYyWU84S2Uzait3enhsUHA5M1FuYWo4cit2?= =?utf-8?B?OTVSMjVybDk4NkNlOWVPVWhDd2VTUFZpclppNHByUmRZL09IKzYxZU5MbHNu?= =?utf-8?B?cVcwUElRQm9QQUZIT1FiSUd1clBNWjJIMzhRS2F5dStmcXNlNmxCZktib291?= =?utf-8?B?UHQrbzU4L1d2NzNqR2s4WnJ6d0YzWUkyR3FNUW5FY3M4TUkySFlyNkd2bWFK?= =?utf-8?B?dWVrcVJNWVdrbWczZ1ZCL0RPNlJjQmRoM3RWZHJVOVNjZ0doUFRBZCtCWlFx?= =?utf-8?B?NVd4cEFMdUhlREMxYWdKeDgyWGEzZ0FTdGJraFRZWHA5UW9ZNEltU1AvbDJM?= =?utf-8?B?aHRzMHZQYW1JZWx1WjJERG1TSGtMOU0xTHZIVGxRTEZ6Rlo3d2h6UDI1a2lu?= =?utf-8?B?QVBuTU83YW9FZ0lrSUZoeExsUEVoOW1uU01ueGF3VFQ4WWdiZWg0eWpaWUEr?= =?utf-8?B?R3UrcSs3ZG90aXdyMXhFSzBnOW1UaDJoalhOSlEwc1E1UldjSEtvNGdiSG9u?= =?utf-8?B?RnVWb3dVYjdUTDZsZG5VaFZISVBGcEwwZkt5YzBCR1R3NzFSS0twWG40eFU0?= =?utf-8?B?M0swdDVVazEwVzFNRWlpSS96ZXlUYVlrcG1wd1lrbGFGQnpoeW9kQ2NKK09y?= =?utf-8?B?cVpkMVlYelpQMW1Neitaa2poM1ZCbXl4MHN4eGIyRzArY3FueUVKTWJZYXpo?= =?utf-8?Q?/ZDnLPcNYIkZyHfQEkyHj8KBjWHtn8=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH2PR12MB3990.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(10070799003)(1800799024)(376014)(7416014)(366016)(921020);DIR:OUT;SFP:1101; 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(where = P is > the provider of the backing pages) or struct Borrowed, which by itse= lf is a > transparent wrapper over Opaque, i.e. either > SGTable> or just SGTable (which is equivalent to > SGTable. > > - `SGTable>`: Represents a table whose resources are fully = managed > by Rust. It takes ownership of a page provider `P`, allocates the > underlying `struct sg_table`, maps it for DMA, and handles all cle= anup > automatically upon drop. The DMA mapping's lifetime is tied to the > associated device using `Devres`, ensuring it is correctly unmappe= d > before the device is unbound. > > - `SGTable` (or just `SGTable`): A zero-cost representatio= n of an > externally managed `struct sg_table`. It is created from a raw poi= nter > using `SGTable::as_ref()` and provides a lifetime-bound reference > (`&'a SGTable`) for operations like iteration. > > - As a consequence, a borrowed SG table can be created with > SGTable::as_ref(), which returns a &'a SGTable, just like similar > existing abstractions. > > An owned SGTable is created with SGTable::new(), which returns an > impl PinInit>, Error>, such that it can be initia= lized > directly within existing private data memory allocations while pro= viding > the required pin guarantees. > > - SGTable> uses an inner type Devres to ensure that= the > DMA mapping can't out-live device unbind. > > - SGTable> uses pin-init for initialization. > > This patch series depends on [1] (branch containing the patches in [2]). = A > branch containing this series (including dependencies) can be found in [3= ]; > Abdiel's latest series can be found in [4]. > > [1] https://lore.kernel.org/rust-for-linux/20250820145434.94745-1-dakr@ke= rnel.org/ > [2] https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h= =3Dpage-iter > [3] https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h= =3Dscatterlist > [4] https://lore.kernel.org/lkml/20250718103359.1026240-1-abdiel.janulgue= @gmail.com/ I am going to do a full review of this revision over the weekend, but I have already successfully used it in nova-core to boot the GSP. Thus, Tested-by: Alexandre Courbot