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Mon, 9 Mar 2026 11:48:45 -0700 Date: Mon, 9 Mar 2026 11:48:44 -0700 From: Nicolin Chen To: Nilay Shroff CC: , , , , , , Madhavan Srinivasan , Subject: Re: [bug report]: iommu WARNING is observed on powerpc system during pci enumeration at boot up Message-ID: References: Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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: BN3PEPF0000B36F:EE_|DS0PR12MB8501:EE_ X-MS-Office365-Filtering-Correlation-Id: 7b9a4d43-8144-46e9-c220-08de7e0c8d81 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|376014|82310400026; X-Microsoft-Antispam-Message-Info: 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 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)(1800799024)(36860700016)(376014)(82310400026);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Ej0mGbkk5nMX7LTaRHprkqtjHnwT45j8n4GLv1V4PzfLFGN4qfIh1mYqfeKifesyvJ2gJYLUwIqXKspW71HGFxVyIluWGFkLmXMxtTBTgobbo5a3mCgvbIuMPPWy59O02/4WPbpyrvST73F5ZzICVg15H9pit8bOfUJYJ+mRlNYjbNHCbTNNIvBJuzkClZGq+k6AYcuXHZUfFxw4+VOMQf+xEH+9Q3HueoS7JpBW7moTdCMB28Dj5ZkeDLlFcP1soMMQ1CxqC9DCR1jS6BI9jqoY2iUykdixbmnyhpFrKAYAxbh6l9XIB0Dat3mksHM5Kln74GOQni5IFZ1yC/LxqQ2Nf7VtUu7fUbHWT9OdEt1gqXBEBRFow9gpWdqy4Fs2ev9KihAOvtRIWup2r169RFBS9G1T25gwvvy9QLdQUvqjvUDXvQg0HVnwuPIaoB41 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Mar 2026 18:49:11.0200 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7b9a4d43-8144-46e9-c220-08de7e0c8d81 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: BN3PEPF0000B36F.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8501 On Mon, Mar 09, 2026 at 11:27:42PM +0530, Nilay Shroff wrote: > Looking at the warning it seems that this is a regression caused due to > commit a75b2be249d6 ("iommu: Add iommu_driver_get_domain_for_dev() helper"). > > Any help from the iommu expert would be appreciated. Though I am not expert, > it seems the following patch help fix this warning (I encourage the iommu > developers to confirm and/or take this forward) : > > diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c > index 0ce71310b7d9..d122e8447831 100644 > --- a/arch/powerpc/kernel/iommu.c > +++ b/arch/powerpc/kernel/iommu.c > @@ -1159,7 +1159,7 @@ spapr_tce_platform_iommu_attach_dev(struct iommu_domain *platform_domain, > struct device *dev, > struct iommu_domain *old) > { > - struct iommu_domain *domain = iommu_get_domain_for_dev(dev); > + struct iommu_domain *domain = iommu_driver_get_domain_for_dev(dev); > struct iommu_table_group *table_group; > struct iommu_group *grp; > > > Please let me know if any further information is needed. Yea, that should be the fix. Please submit a "PATCH rc" with: Fixes: a75b2be249d6 ("iommu: Add iommu_driver_get_domain_for_dev() helper") Cc: stable@vger.kernel.org Thanks! Nicolin