From nobody Wed Dec 17 06:04:12 2025 Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on2074.outbound.protection.outlook.com [40.107.243.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 184D828B411; Wed, 7 May 2025 13:52:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.243.74 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746625970; cv=fail; b=RAVc+Frz1yfdacSmiHCP4vayzCerLey9b9DGjjxcoY2+jJLjs4LgCMJvFYFuQSeYgvnc/tD8uTK53NsHjtUS1/ZPnrJK1O70VWiB7U5Nw/k8dGNFIORbWIIOG5bPItKxBaBfpHjPxKToaAuj91mUZggHFbjfjw+IUpRJ+smSm8U= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746625970; c=relaxed/simple; bh=hGbc2yk2RM2Y+o2LTZUmTnurzfCZrQq/roBBB88RbuE=; h=From:Date:Subject:Content-Type:Message-Id:References:In-Reply-To: To:Cc:MIME-Version; b=NqZF2t1F6PEj6nns6Ne53+MndbqAalMsPT7h4xZkeq5f/c4XqsEo0FaabN1r+8OHcku2Ho6lbkuRE4sq3bscV4n7bNmMsczCTQtarMZGGlDOPnkXBbDa1MnuoKEG8XnwoL182wIp3fx8D0x3kH9MuYWTi24C7D17uG7KJ9/P6NI= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=WYApacyw; arc=fail smtp.client-ip=40.107.243.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="WYApacyw" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=sL279KkE16yiQsVa9hi8pEMjTlMaWU76h7vkZKsjcS4Shy26T0B9btZ9wtydmVyCDPnUT1nuYCbD/wx7lt1M2LVzfFwCUEWR8rhSG6HDPXCrrDGs6aKOXchhc5qr3Zm6ab8rkFlGmizOtpwW1zCBCKdAeqnuX/7UTN1cV22NkVCbcAMu9M4scWw8UTL0YIrqqcMRyen92ALsc5GIPVlqlMcCw2yTCxSYhwzwhleY+SVq/R8rHh2iedc1auI1RUmYb+i5+R9PmatXrnK164DyjFiKunp3gnMEE5jBqIOY1UnECMSJDY0rNRutrxv93d3RMecgpx2bo6y3dtYO07nmlw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=C5fn5BOL5M1i9E9djBbdLHqZ4DTyMzx3e+L+XnmzFq4=; b=tUKMaOe/SWOz7o/sq9nFZIjgV/7Ofn7aULq4bibkdIpsnzRQD2Uj9r0HxGqddbdUvllJEH4Aphb765Z4PsgNtcNp3vCLUoQAZv546CKvNY4ZDMRb5ezj2oki4mDk/MdJhmj7sHe9xjgwrx7iSFb2t4VNy14lHLeT7uZEmjkaa9WENgGdsGxyt655s5dtYKPHB3JENe6eKKjzumgpcCwLMNJ1aH2szlBtwu/8ELQHhSvkVUNS8b0qf6YQRO/nVRWXkZ53/Lz8m1IaEI1rr2NFRlZhgt8YaPMuUpkcsGk7rnPYNtZfZaIp9HF8D8r1BSRSlNlV3Zsy6CqCoU6BWnbowQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=C5fn5BOL5M1i9E9djBbdLHqZ4DTyMzx3e+L+XnmzFq4=; b=WYApacywBLcTr+ayvK/i32sCocEmZOBwtFzmY8g5oMZuVFGzcFG5B7vv/BZCy5+2QHCV59iA5hEQ8LyhD9SK480Zx4XiatHMO97DxcX+c9Cql3yzk0QAPXpISkzZmXpKxCmhgWFOPDIf/KR3GixzuYwU5AGq3WXH2Z1JvRjih+o/8eAsA6JxR1Jcu2XStQMypAHAfZexnlfvksuTTUB2A+HOLK9pI0KH/DTDKFy26d0PCDxBn0W/G9tV/JXjVB1mFo02w9R/B8UyiLcsab1Ewo/CxeqJNmB2ZwWjkkm2DAU3QuMJ/XDG/VBB0WpcC1dciZWUyThs5VoqOZChcWprjA== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from CH2PR12MB3990.namprd12.prod.outlook.com (2603:10b6:610:28::18) by PH7PR12MB6761.namprd12.prod.outlook.com (2603:10b6:510:1ab::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8699.26; Wed, 7 May 2025 13:52:45 +0000 Received: from CH2PR12MB3990.namprd12.prod.outlook.com ([fe80::6e37:569f:82ee:3f99]) by CH2PR12MB3990.namprd12.prod.outlook.com ([fe80::6e37:569f:82ee:3f99%4]) with mapi id 15.20.8699.026; Wed, 7 May 2025 13:52:45 +0000 From: Alexandre Courbot Date: Wed, 07 May 2025 22:52:28 +0900 Subject: [PATCH v3 01/19] rust: dma: expose the count and size of CoherentAllocation Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250507-nova-frts-v3-1-fcb02749754d@nvidia.com> References: <20250507-nova-frts-v3-0-fcb02749754d@nvidia.com> In-Reply-To: <20250507-nova-frts-v3-0-fcb02749754d@nvidia.com> To: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Jonathan Corbet Cc: John Hubbard , Ben Skeggs , Joel Fernandes , Timur Tabi , Alistair Popple , linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Alexandre Courbot X-Mailer: b4 0.14.2 X-ClientProxiedBy: TY4P301CA0031.JPNP301.PROD.OUTLOOK.COM (2603:1096:405:2be::17) 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_|PH7PR12MB6761:EE_ X-MS-Office365-Filtering-Correlation-Id: 7cb2cb4c-2d17-4ee5-21b7-08dd8d6e71e3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|10070799003|376014|7416014|1800799024|921020; X-Microsoft-Antispam-Message-Info: =?utf-8?B?SVNsODdGY0pqblROWHZUMnhmYkxTOTJZb0FpREg5cUg2WXZxR2NXTytPTGtM?= =?utf-8?B?L2RUd0VzdmJCTEZyZXNITTgvV2ttS2plZWpXUW5tb3FqK3RFNTczZmZ6dGdT?= =?utf-8?B?MlBtK1IxMkp4ZzhnM2FzWVFJL0dEbVRBTmJ3NzNxOHFrRE9zaHlvTFpuaWg2?= =?utf-8?B?RGNlRTRsMkg1aFBmN1pSUGUxSVl2Yi91K0ZpaVIySGlOemp0cDhDa3JvbDh6?= =?utf-8?B?V1Y3SjFPYnFtTkxZMERiNEJjVG54M0JyajhGdngwR0MxT0NEYjB6Y09QM2ZV?= =?utf-8?B?SEJBbEJPdzJUMDM2K2xTbEtVcllzQWlwT3ZzUFU1UmNXTFFNTmhQMEVid1Jo?= =?utf-8?B?NTJHc1VGQThXci85ZlZ3NEszWXEwRVUyL0V3ODRWWGdaYTg5alVnMDR2NC9s?= =?utf-8?B?endqV3YzREhoUDdQZzJPRFBMdUZBbG12MTRMYlpFazNLZmhxYjIxUFdSVURM?= =?utf-8?B?aVhrMWJrSDg4dTFvM0lYaFRreUYwbThzbUMrV0sxRkhSTEkzT05Uem1TQXRL?= =?utf-8?B?WXpyaHpoYjVmckEyd1h3TFdWU3BkNUZRYUdmVFVpK09VZnhnYjh1eFo5SE5j?= =?utf-8?B?WWJ5SU13dmRGMkZrRzllWnBEZjRSNTNiVHl2S3hndzZGWkJvZElmZ3EvemQ1?= =?utf-8?B?VGNkN24xM083a0ZEQi9sWmZ3UDJSUHdmTm5CUW1WUHE1WDVpamllVnhNVTha?= =?utf-8?B?ajBQR1liN0JXNGtNRUo0bkNDYUsvSVVtZnNHSWYydkFseEYwcG10RkdnSnZG?= =?utf-8?B?ekZrZEp5aWtHV0VuejQyVjErZkwwSW12akNqVmRxZGNHZWFFWjNOT3lFbnAr?= =?utf-8?B?R1hWVWZncEtQc0ZiYXpaNjhxQ05qRE9hdWIwUXVkbXhubW1XRHVRdW5SczRC?= =?utf-8?B?NkJaRGhxQ3IwZEIvOW5LZFVjL01GTnhhelB6TmhrdE5nOFJYcjY3cVZHclNh?= =?utf-8?B?c2N3RGpqSTBjTTlYUUdsQ29FcEM3VC9zQnc0bjFnbWxtdXkyM2NXSXo4c3Ri?= =?utf-8?B?cHBYSUhuV0VZQ2V1R3pRMEp2VFZRZWZLaFFyVjhoVmNZeCs2ajFHTkpocVZi?= =?utf-8?B?S2hiSjJzM0J2TTJic3ZmT0k3S0tudG1sMUZ6ditBN2RaeGZCdGJmLzl6VkND?= =?utf-8?B?cnZ3MU1udjByS2FzQzRLOUtqTTRucnh6empyYytyR3A3d3dKWStIWUxZRDNB?= =?utf-8?B?MjI2TDNEaVJ3cHg4cXQzVmt2QVNuTE9aUnZiQUlzUFVjU2RLL1U2L3ArOHRF?= =?utf-8?B?MGhBSmlCNjV2VHFoQUhsUmNRWSthNzlyWGMySjBGa3NHa3pzN0xzbWVjczlk?= =?utf-8?B?WUhjT2M0UzZwTUcraXZhREhsL05MNWFPbXc1TTJGd2ZSNGVzUmdqQWQ5VzIy?= =?utf-8?B?RnhXNWg2dUV5cmIrKzJ2QVpkazh3YmhsQlU1NG04NWZJanNpMDNUOGlUeURV?= =?utf-8?B?RWVwQmRGNWxlMWdxZXgxekZkOEhrSUNnUkl5ZzlYYjNkTUpqeUZYb05Da3c2?= =?utf-8?B?c2dYRnZZa0RlL2xOeFcwb3NqZ09vYmUxSFpPOWJpRzExWVFKb2xVKzZvaTFT?= =?utf-8?B?TWt2UFFiUkV0NTZYYmpYZTNDdzRBeGJDSTRlbVlGTnFnWGp3WW9ydFlyV2Ez?= =?utf-8?B?Nkwva3dnbVc0ditseXl2UGdPcXNmZVRRQWthWjZYR24raVJ0cUdBQi9SZGE2?= =?utf-8?B?NVhnbzkwUFlQaE9XNlNrVHNSOXZvRUtJbVo0Y2IxQ1FjYW5OaVF1a3lpTnFP?= =?utf-8?B?MzZlRmRkdTU3MVRscEJLRkhrWlkrUG9wQXdpa2p0b1gzUnFYOTYvOXFGY1pa?= =?utf-8?B?dkI1dDllRFFCSEpPOEdPc29TWVRPaWhvV2plR1ZJajd3OTd5RnlJZ2hxWlJv?= =?utf-8?B?VTZqWmZ6SnYwNENxVkhEWTh1WFpNL1JxUHdWYXZKWDZNLzVTQzR0bWdaT3hI?= =?utf-8?B?ZWM4RXNIZ3Y2SGh5M2dZSWx4aHJDYnVsZlFSRDZyL01YOENoSTRjYi9NeXZ0?= =?utf-8?B?R096d3NyNlpBPT0=?= 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)(366016)(10070799003)(376014)(7416014)(1800799024)(921020);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?eXBGSTlENVN1aXZYWHFUTVJlcE4zT2srTFp0cGhPZzNIL21kYVpXVmo1TXBj?= =?utf-8?B?ZTBJZE1FNE5SUWVUNHZNVzhPZEVNMWF4Sjl5aFgvcEZIK245dGxvZkRYd2RD?= =?utf-8?B?V0FvOU9jcjE0YkRYNHI2U3BoNVpzcU0zR055VndoTnE1bTVrVjdKOGZHNDdR?= =?utf-8?B?eXVLK0pDWkNwTXBxMEh5cFliSW5wK2JlNm0zWmQvbG1QcEN5RlhSMzdZWDB3?= =?utf-8?B?VmhxMmExRmgxQ005QXk5WWhIa0RPR2RHNkU0QmpqbE1SSHRiREpZenptR0p2?= =?utf-8?B?YzZ4K1J1VHVydXN0L0Jqckovd2puRytrcXVHa0VzZVJQQWJwZjBPNlBqRlo5?= =?utf-8?B?V0xqanlDd1l1Z1AwMG1VNng1dWE3UXhiVnp5ZFdxVGpPbHRVbFAwRzdxNUpm?= =?utf-8?B?Sm5YVE1XNmNaZEFiUXhObVRDWVBrSXIxczFhcUdqQXZsUHlzcVRlTDdUNVJR?= =?utf-8?B?QzVhSlp3eUhGejJEMGQ0UVFlOHg3ODZPdzF6TU1XT2V5d3crVEZuY29xY2pw?= =?utf-8?B?Z3c1U0RMOC8rdFFlNndJbW5uVmROZVN1UVF0eTZXQmttTlJXV3p3bVMzNHZE?= =?utf-8?B?Z2w2cFFaNjZoSGUxNHd4bkpIYUp4bjBXYy9MZ3ZvcWRlbkYrck1qWmJUWk0w?= =?utf-8?B?ZXJpckxRSWZDRnNvb3JMY2ZsZVlObFFYWVltMHNYZXVCUUIwY1ZnQ0dQOUc1?= =?utf-8?B?SVUzdTFycTEwSDUybkQ0amhHcWsxRndLMjhyaXVhMDhTd2I3R0RpRnN6TWFW?= =?utf-8?B?QlFNMUNXb0NOajFibm5ia2hVb0RUZGxiOHFMMUN1OVJKb0NEczhGRG4vbjlB?= =?utf-8?B?Y250STdnOGpydXpRQVdlelJNdmZUeDJkenNvZGZsVGxvT3BlUlNjdGE4R1A2?= =?utf-8?B?ZXp6QXlWSkYxbU5sakpleDlnRjd5dDUzdGMrZ2lSeEViQXZpU2ZxZ25QTzBX?= =?utf-8?B?MmxlMk9URHd5Qk9uT29iVkY0OTdyQnRhZkZtMlMxS3FLWXVIU1d2Zm95N1RB?= =?utf-8?B?L1plR3cxekExM1c2MWFjUDZONHM4Qlc4aFhFSy9QVUJTc2FrbmpodDBMZHk3?= =?utf-8?B?SEt0Smw5SUx6c3lodDZ2MFNyTmV1ZGRtSk5mcVFvOHJkWGU2TklMZUE3bnVM?= =?utf-8?B?OEVkUUZQQk5WSUNtK0FPU1FQNUxnaE41MURzVkdVdURhSmw3ZnVXaWxld1lx?= =?utf-8?B?eERHWHhqN2h0Q3AySUIzUmw4Vi9kOTJHSnVXaHJ3cjJwdTZ2SnNHYTZYbEdj?= =?utf-8?B?a01icFlvMEg3bFBrT2hNbjlhcWtwM2lkSG5LQmNwSXJROEwrTnpNS2FYalp6?= =?utf-8?B?QURrc1UxNFRKV3d3alBldGJiSU9FcXBEenJzVnpZL2FNZC82UHlqaTZQUkFm?= =?utf-8?B?WnlJNnQvWk5NRFFGbGZySE16cVh1UUFOLytOcHFrZXNGdkhhU29tQlBCOFNv?= =?utf-8?B?akZYL2gyVmdpQnpRMm1RcWx4LzZyRDZMRVJSSzVNM0Fob2FIdnZlVmpYZXFR?= =?utf-8?B?VU5aQlp1UXBhWU01Zk12N0tQWFNSYkp1VDhvT2pSclRwdmJuQnd6azgrR1Fh?= =?utf-8?B?NjdlZTYwUVBHRGRlbCtpR2gvZU9wV2RxTGMwOFN4UXg4NjRYd0VBOVhkdlNZ?= =?utf-8?B?U1ZKWm1saXY5emljQXgvd1VQeHlUeXlpZWhFeHhKZVVkOGNLU0x1Q2tpRzRW?= =?utf-8?B?NFVicUE4Nk9ET293OUhKMnZXamdaQ1F6ZWdCanR0Qm1HN05oVDBCYkNZV25F?= =?utf-8?B?VDNpR1JSYi9iWEN4Z3RYMm9aYW5YNG04MzNNMGQyVml1b3l6OEZ0UDMrWXJ2?= =?utf-8?B?dmhnNFhCcEo2aklVSURLTlNaMWgxOTR3WEhnc3UzTWVzZ290cXp6VEttbDl5?= =?utf-8?B?WThOcVRPQmZ6N1Y0NHVCQkdvVWc2a3dudStkSklsQXI0OGZhWnFhK0VOZ3VI?= =?utf-8?B?cWVibi9ZaGRTMFhWRnBTbUJ3bUxZVkJmVTBPRHhMUlFyUUtBMGJEemlLVHhX?= =?utf-8?B?eTVZcWUvVmRJbExLbUEwN2YvMW5reCtWdXVRVUk5TDEvUGJ4ZWJURmpJcFJ5?= =?utf-8?B?d3dtS0FVVTFpR0puTU53Q2d4V2tQUjVNNEpHcVJwSExSUjh4OXdCV0xKYnpz?= =?utf-8?B?SzRlRE9naFNBaEN6OW9FU0tDQTM1T1BOZm9ORmN2V20wTStOdFNDanhIelN4?= =?utf-8?Q?4hNFWPU3pTCGAw3PeuduLe9wKXGXPoM3TP5hn6pI9+mW?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7cb2cb4c-2d17-4ee5-21b7-08dd8d6e71e3 X-MS-Exchange-CrossTenant-AuthSource: CH2PR12MB3990.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 May 2025 13:52:45.4411 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Ybk04sucz+rhEIVdo/+Zpdkf/bxXFWIHXZcnlkFXtC+9p4GAHLJRuuMEtYPWh4pMFZkzArFPz5mGzQvf878U0g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6761 These properties are very useful to have and should be accessible. Signed-off-by: Alexandre Courbot --- rust/kernel/dma.rs | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/rust/kernel/dma.rs b/rust/kernel/dma.rs index 605e01e35715667f93297fd9ec49d8e7032e0910..18602d771054fceb80c29278b19= 45254312ed7c6 100644 --- a/rust/kernel/dma.rs +++ b/rust/kernel/dma.rs @@ -201,6 +201,20 @@ pub fn alloc_coherent( CoherentAllocation::alloc_attrs(dev, count, gfp_flags, Attrs(0)) } =20 + /// Returns the number of elements `T` in this allocation. + /// + /// Note that this is not the size of the allocation in bytes, which i= s provided by + /// [`Self::size`]. + pub fn count(&self) -> usize { + self.count + } + + /// Returns the size in bytes of this allocation. + pub fn size(&self) -> usize { + // This is guaranteed not to overflow as the same operation has be= en done in `alloc_attrs`. + self.count * core::mem::size_of::() + } + /// Returns the base address to the allocated region in the CPU's virt= ual address space. pub fn start_ptr(&self) -> *const T { self.cpu_addr --=20 2.49.0