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Thu, 28 May 2026 03:16:23 -0700 From: Ashish Mhetre To: , , , , CC: , , , , Ashish Mhetre Subject: [PATCH 0/2] iommu/arm-smmu-v3: Tegra264 invalidation workaround Date: Thu, 28 May 2026 10:16:15 +0000 Message-ID: <20260528101617.4068249-1-amhetre@nvidia.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000A6730:EE_|BY5PR12MB4210:EE_ X-MS-Office365-Filtering-Correlation-Id: afbfecdd-42fc-40ac-18cd-08debca2331e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|1800799024|376014|82310400026|18002099003|11063799006|6133799003|56012099006; X-Microsoft-Antispam-Message-Info: 6zsAtW1vk/N2TLIwSc0x8uu+fZb19+z2xr23wB1AqLH6bk3/d4Sq90VnyCdDxmmH5lc5TnafqUPh6funw5IMVNeqlPBE4bdQxEojI7nPL+4kHhsT3mTCoIz3RAnzPbu0VhxaAd8Z2eDU5Rk0RygkCEKFFuNIX1vHTZ61pcJ/epz1AIoN9leLKMBxa+nPsz+fnPUdGh3qZCG8W/VSOdgdlJE+23g6e/7PpHs2c3RPLNIpAaVAwfLQEkKHAJ21u4LZgsP9dmAY3G/y3uYVy7yrKSlffYeB6+wNy8KDX+SUSzuyEHAX7WMdqAs1kiGx3k9ik1uQKmuC2L9VCEKush4veHIltLGVajpiwNi48OANyB/GrK3BM1BJvP9KAC2o25MJUn5ftePxfL3WBD5OvO6ZS+yjYh03NN27ftJG75zouvnuf7YwB4ghWnt1UMg+K1YEghN5ggcFkAIg8zG1/P0WoDtg/R48juiyAWeWZIABDT31jVuzTTcRV94GMpJeiSrsPN/wgL8awLyt9r08JeaNWMESLU4EsqSLgHNTGG+tfXwOr9AjoaSBxiwmYpS+KdwrT3QYLFJPk75e73T8tnEewaf0I0nQT+XF7VOMANZeOEjviZtlef4hX+yM2XIUCTx9+kNEbif69SHOwBM1e+WkTL1lBem578zgCT95pQMPkISo6Q512Nu2J0bw2ZFuVsZhf4/Sdjehz+p3QCw3mdZL8ISZsOzgMNPlfXz/rjhyBaQ= 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)(36860700016)(1800799024)(376014)(82310400026)(18002099003)(11063799006)(6133799003)(56012099006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: o6UnSxBvzti8tExDXZ9FNfiCfdryEyfQrpC0ZOA0Hg25jO5xUwKnq61nihLRQ8uymIHqw9aWdQNtM4ZG3hTzPiR4qcUBu7+AY2YmtdqcZI6PZ+RD9YJSFdw5ERSiRuEgzemoWnWkeRHYDag6Afqoo9nCGErUSXqChcPfnkhRVrD+mi/ybJ9ijSKDYGURlClo1XJGI8/xhchqKbLfUccKvm1/WBy7D9V6gywY8E+FtUTb/A3r7ebuJzh1d1e9u6QY3rMkWM9hmTs9Yoe/GP0Gv1l1ebn06tXQWZt1G4FRSYMEf6WTBPVQDYMOeseXJrdo2to69qqptHf3v2DtoYErFKc2n+XpLV/oRiuYjIOZklw6/zNzGDcZ7Uzv/VtOmO7O1NKOLH97TBlWno7/opLqe9BGqS3bGKbuidDT5UW1T/Yf4o5IH/OOwk2Ec2YWLV3c X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 May 2026 10:16:36.1016 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: afbfecdd-42fc-40ac-18cd-08debca2331e 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: MWH0EPF000A6730.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4210 Nvidia Tegra264 SMMUs are 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. The second issue must execute only after the first issue's CMD_SYNC has completed, giving the sequence: TLBI/CFGI ... CMD_SYNC TLBI/CFGI ... CMD_SYNC This series implements the workaround by hooking the duplication into the single chokepoint that every synchronous submission flows through arm_smmu_cmdq_issue_cmdlist(). Patch 1 detects affected instances using the existing "nvidia,tegra264-smmu" compatible string and exposes the condition via a new ARM_SMMU_OPT_TLBI_TWICE option bit. Patch 2 wires the option into the CMDQ submission path which is used to re-issue the cmdlist when @sync is true and the first command is a CFGI/TLBI. Ashish Mhetre (2): iommu/arm-smmu-v3: Detect Tegra264 erratum iommu/arm-smmu-v3: Issue CFGI/TLBI twice on Tegra264 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 70 +++++++++++++++++++-- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 8 +++ 2 files changed, 72 insertions(+), 6 deletions(-) base-commit: f86b1ac9a67321419fec095ecb27584b2f77e339 -- 2.50.1