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Sun, 26 Jul 2026 10:20:11 -0700 Date: Sun, 26 Jul 2026 10:20:10 -0700 From: Nicolin Chen To: Ashish Mhetre CC: , , , , , , , , , , , Subject: Re: [PATCH v9 4/4] iommu/arm-smmu-v3: Enable CFGI/TLBI-repeat workaround on Tegra264 Message-ID: References: <20260726081904.1408859-1-amhetre@nvidia.com> <20260726081904.1408859-5-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: <20260726081904.1408859-5-amhetre@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF00026369:EE_|IA0PPFACF832414:EE_ X-MS-Office365-Filtering-Correlation-Id: 70efa891-e236-4595-864e-08deeb3a2bda X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|1800799024|7416014|82310400026|36860700016|56012099006|4143699003|11063799006|10067099003|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: QUZZWSOrP8hzZOfzrtwRm8GA1ePyQ9NBzXWAVGqY3XsOFG1JMLMebHhDqmrJ5GPeTe9nbkY07mNl+2i4BLUuSHbIol9Uri2bQBaI5LXl+td/3tyFVLxr+GG1KS5MpNactIoi02a0F7t3jx35pa+1WsfcrVQELfk3TvG2coF2oKLuCoMO8FphoATq/Mj1YrTlBzeGmGDmaDvOKOw9rXqApb/E3id4lY/n2Oi++SVb7a+3SJyQ4VgDAg56GQHXFdH5MZuSxaegQzEbohW5dsUOZr39OMrn7fZQTpi/ZZC+KrJLCDwXhjdjH+xmDgwO6cdjMjseefyXSjyehD/ESULIqOZ1lcYQTfMTJvhnZxVff54tXn8yB5hoa7omN7caWcSJOwENpJ1WGV2skQHQEZk+8Z3Jl5UVHgHn5VO7KHuWsKKXd/nB3w1ZGyEwCp8IyDgy X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jul 2026 17:20:20.8159 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 70efa891-e236-4595-864e-08deeb3a2bda X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF00026369.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PPFACF832414 On Sun, Jul 26, 2026 at 08:19:04AM +0000, Ashish Mhetre wrote: > Nvidia Tegra264 SMMU is affected by an 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, and > that infrastructure is already in place behind > arm_smmu_erratum_repeat_tlbi_cfgi_key. > > Neither IDR nor IIDR flags this Tegra264-specific bug, so hardware > detection is not possible. Tegra264 is device-tree-only (no ACPI/IORT > support) and already has a dedicated "nvidia,tegra264-smmu" compatible, > so DT-probe is the only viable detection path. > > Enable the workaround on instances matching the existing > "nvidia,tegra264-smmu" compatible by calling static_branch_enable() on > arm_smmu_erratum_repeat_tlbi_cfgi_key. Document the erratum in > Documentation/arch/arm64/silicon-errata.rst. > > Signed-off-by: Ashish Mhetre Reviewed-by: Nicolin Chen