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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> 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; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(36860700016)(82310400026)(1800799024)(4143699003)(11063799006)(56012099006)(22082099003)(18002099003);DIR:OUT;SFP:1101; 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260529_143051_399420_EE60FF06 X-CRM114-Status: GOOD ( 15.49 ) 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 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