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Fri, 29 May 2026 14:30:23 -0700 Date: Fri, 29 May 2026 14:30:22 -0700 From: Nicolin Chen To: Ashish Mhetre CC: , , , , , , , Subject: Re: [PATCH v2 1/2] iommu/arm-smmu-v3: Detect Tegra264 erratum Message-ID: References: <20260529140830.629738-1-amhetre@nvidia.com> <20260529140830.629738-2-amhetre@nvidia.com> Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260529140830.629738-2-amhetre@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001D1:EE_|CY5PR12MB6226:EE_ X-MS-Office365-Filtering-Correlation-Id: 79638964-4343-47ba-e53a-08debdc98808 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700016|82310400026|1800799024|4143699003|11063799006|56012099006|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: TJup/SQNefnTWoW+WNCw45JKkrfUUlabIn0JulGLt/MNmg/GfF2i9Uh//l4zijKCUp15JbWdyWLfeRhPOoxmrfeLbQABIL+q3GvfeAgJPAG615xN7NTKU6sOJ0AvnNbJxVu+T+4qh0ihH3O2xaH4HU1lFCBaOvFK/cSfdkTV7T4EMGzX88eZu6rd6NmyTuUf1ElQ3/AfH+kF4Z7oCczM7uCPTrbvQOjlzBAW33Ty60t9hh9YfLFWKAnF6ETgNGr40Iw9ptwS0V7Wp+AVlp+z9r57xIKj4a+a7Ct7+BuhW98YRgjQQMbMVwoeeEX2ZsspUIf2egsGzXfOB7PFO8OZEv58IpfQrwuP0OIwq55pIQWQ/eE3XeOKmKa/TX/IMoEpkhExOw6ZnfO+HwJU34O1oYUHcmecAwd2oEMsOr1+cfDa1N3VBHorAjKGSyC4xYmP X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 May 2026 21:30:40.1249 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 79638964-4343-47ba-e53a-08debdc98808 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001D1.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6226 On Fri, May 29, 2026 at 02:08:29PM +0000, Ashish Mhetre wrote: > Tegra264 SMMU is affected by erratum where a TLB entry can survive an > invalidation that races with concurrent traffic targeting the same > entry. The hardware-recommended software workaround is to issue every > CFGI/TLBI command (each followed by CMD_SYNC) twice. The second issue is > guaranteed to evict the entry. ATC_INV is not affected and must not be > doubled. > > The erratum is not flagged by any SMMUv3 IDR/IIDR register, so it cannot > be detected from hardware register. Tegra264 boots from device tree only > and has no ACPI/IORT support, so detection is through device tree only. > > Add the ARM_SMMU_OPT_TLBI_TWICE option and set it on instances matching > the existing "nvidia,tegra264-smmu" compatible. No callers consume the > option yet, next patch wires the workaround into the CMDQ issue paths. I was told to avoid "patch": once a patch is applied it becomes a commit. So, maybe "a subsequent change will wire". > > Signed-off-by: Ashish Mhetre Reviewed-by: Nicolin Chen