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Mon, 24 Nov 2025 14:41:16 -0800 Date: Mon, 24 Nov 2025 14:41:15 -0800 From: Nicolin Chen To: Will Deacon CC: , , , , , , , , , , , Subject: Re: [PATCH v5 3/7] iommu/arm-smmu-v3: Introduce a per-domain arm_smmu_invs array Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF0000009A:EE_|SJ0PR12MB6942:EE_ X-MS-Office365-Filtering-Correlation-Id: 1a83bbee-eadd-4a04-34fe-08de2baa9e71 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|376014|7416014|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?+zFQC9v0kZ7pfjbPbRcWyMKWzsPeNQCJFQYOmi5mqqoLZVP6iGM39+0vqgi4?= =?us-ascii?Q?BLcDWHAIPL9STPj0W+hZnL5bVpYnVwZf4y0H4yIyxfJl3jyhYxL2Fm5weLZO?= =?us-ascii?Q?Xp6ZLGMFXSaOGPzXptUcjB6Bay5NAcH0xz3XNmdf7/fAr1lLq4/YSMx5sCLe?= =?us-ascii?Q?wyVXPpVVO/n/07ZpEVOcH6U8/LKGq2dO2bNMFiPDgIfTHRUTOO1hOdT88uOM?= =?us-ascii?Q?CaITCDJtd9fFSArz5K9o+B8Vg5EP4Q5ExXfr+YxakQr8BaTzjdybUF4BP4WE?= =?us-ascii?Q?eWVcKJ8uwYui2ayDzXl9hkBLnV32mltsuKeIriIRkXtXdVO5cf2ud9unkGcp?= =?us-ascii?Q?nzwxGAif7GqAj6iAMWeiQQbXnDGsf1NpaUHUbUmCgzvUzc3iPcXQcaZGCaYf?= =?us-ascii?Q?C/QcnN5o8XRilVWD4U5t9Lmpii+Q6UBu3b+B7D+tU0jCakeVjrY2wMhfgbkY?= =?us-ascii?Q?hxaBvIFFu6IggKb3HXH6tJnmgLBBX6wU/shHVUoZyfj2xfNyQo20UMerGLzB?= =?us-ascii?Q?mrb/rRqrXnLdude4Rr2CDrZGwCu+c30QRFSmeMx8cDp2CRCsoQSPj09wSl26?= =?us-ascii?Q?epB6SA5b0qpwYJgmjyl4cYJ1tij6Aut4JvZXNl9WJnT88B5fOqGPLe+nhHtp?= =?us-ascii?Q?cTQ2ofpq6yWmMjJcinU1doB4LhT9LHSvDxcwTv6SUs4cAOD5wBgDbUFk9Bel?= =?us-ascii?Q?UuSLOUqnKwH5KnyOyIxncBGPtLORc+6sswPSKs9x1LUCj5v5V2GhguK/xZwA?= =?us-ascii?Q?Ex/n1xFi+ojB8ddLhoT55AL5AqfaBhcG6yYNy+bii+WwUA6aGH9zusW4Af99?= =?us-ascii?Q?D9bDkScPxFXRYKDcRHXF8WgGc2Pu2jv9JBmKFaNKgwvBldBQsr9mNYbAr5P7?= =?us-ascii?Q?D328at0p1mzwCuhmwnyoRfXfUqffYMnFbVlQWBv5FPpSbVNLkQPpKCAn2Mjz?= =?us-ascii?Q?UWOoXqm30j5Qi85MjqaGSx/Nx71lt+P/+/6d70CAxhfj4dYN36lrPU6UH+Lp?= =?us-ascii?Q?IDFa05aoXzgtnqyusUorAPdMVfjt0+urEuU5Mq804REtZ1+n48LTsGw57MxB?= =?us-ascii?Q?U72zY9mQ0w4PDmndU6VQ+pOmcVdjgStz7e+V6vZTy450gZj8GfIfdpOHF+XX?= =?us-ascii?Q?sqAH/xUJ1X8NhqjWYsnS5+G/BOPdXReoHnbtFz1KmG7thz5Q26qyi3Rb/YAY?= =?us-ascii?Q?9bKtX5PgkHIbR0HXG6cdGRU8TbeicuuHcxulzqdI3HFCdqI9JaWeDFTe4bxU?= =?us-ascii?Q?s9Q6VXnPGEnaB1LRrovnyqx1fiXPOaLKaHTkHWf19tS8mh9hPMpPtf46d4KL?= =?us-ascii?Q?cLBu19zVOLLb3k1qivJybSegG386V2tk6hMheTouA/bkgnWWEnucu3pjLbmX?= =?us-ascii?Q?u+Uc4nhd72vUSG5fM+olo7jDNTnitecHgykhIxIW67oj6/gSgdn2At5Uopou?= =?us-ascii?Q?jk8PA+WO3H73TyYzHYdhSSNup7V+CRc7f7ItFYGjxPYtQtleAPpso8SUgpRL?= =?us-ascii?Q?orBFHznaPq5lagp374Eg1GJ0k+BEZkveq6CtkqfR6Zjjjdg01FJ/ERHzNVT3?= =?us-ascii?Q?PnsUg4UJ0YIxPrmvUM0=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(1800799024)(376014)(7416014)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Nov 2025 22:41:33.4291 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1a83bbee-eadd-4a04-34fe-08de2baa9e71 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF0000009A.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6942 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251124_144144_653836_E4788247 X-CRM114-Status: GOOD ( 10.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Nov 24, 2025 at 09:42:31PM +0000, Will Deacon wrote: > On Sat, Nov 08, 2025 at 12:08:04AM -0800, Nicolin Chen wrote: > > +EXPORT_SYMBOL_IF_KUNIT(arm_smmu_invs_merge); > > There's nothing really SMMU-specific about this data structure manipulation. > Do you think we can abstract the invalidation array concept into a library > which other IOMMU drivers could use too? Yea, I am trying to shift to that at this moment, hopefully to combine the iotlb tag (asid/vmid) allocation as well. We do see it could be quite useful in AMD driver already. And I will address the other remarks of yours. Thanks Nicolin