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Thu, 28 May 2026 11:38:25 -0700 Date: Thu, 28 May 2026 11:38:24 -0700 From: Nicolin Chen To: Ashish Mhetre CC: Robin Murphy , , , , , , , Subject: Re: [PATCH 1/2] iommu/arm-smmu-v3: Detect Tegra264 erratum Message-ID: References: <20260528101617.4068249-1-amhetre@nvidia.com> <20260528101617.4068249-2-amhetre@nvidia.com> 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: CY4PEPF0000EE36:EE_|SA3PR12MB7974:EE_ X-MS-Office365-Filtering-Correlation-Id: 51236ac2-552b-4384-607f-08debce85864 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|82310400026|376014|22082099003|18002099003|4143699003|56012099006|11063799006; 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)(1800799024)(36860700016)(82310400026)(376014)(22082099003)(18002099003)(4143699003)(56012099006)(11063799006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: jDnJdJO2viJ8vptYUaF5XYQ0D8E/zQti+b5HIvuf+ZCcCktN/7cegHQo7qQi/+tar4t9y+be6M9cI+3QpR/8TCcIioZoQZ4VBi/RHRCNLWXvEb8ctVYwWGBRGTkKFPj+0YlB4E/Rpfb3Lza7IsR32cbXT0K6Oh+AE7oW0lqZ9qU8RsH3EIgSyojDM3teMULh8gqSiPN6VcMqO9liM5ZE69f3HNJjKrlDMGP9jiRmUy8CXHLgMdbguJ5jtdscvcQOCMekTy+sHNLTZxmskFT/5M1jBOTqniHINdUkH5DSd84st65QOzFyksCoQWmtbE4woKKjo+/TjUifZT7RaU7XN4GiSFlmyNzDqEJ7TcI1vOq9z5s/OqB5/iYjD+A1K69/5OLOQwaQnq9NBnKj11Fa0X+oQGtCekC/XMmN6MO7d+nuL0yweTYyVjWJb7krskPk X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 May 2026 18:38:43.3176 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 51236ac2-552b-4384-607f-08debce85864 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: CY4PEPF0000EE36.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB7974 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260528_113854_855211_93B83537 X-CRM114-Status: GOOD ( 19.45 ) 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 Thu, May 28, 2026 at 09:36:34PM +0530, Ashish Mhetre wrote: > On 5/28/2026 4:04 PM, Robin Murphy wrote: > > On 2026-05-28 11:16 am, 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. > > > > > > 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. > > > > Can you not detect this implementation from IIDR like for our other > > workarounds? Otherwise what about ACPI? > > Neither IDR nor IIDR flags this Tegra264-specific bug. We cannot > detect it from any HW register, so we have to rely on the Tegra264 > device tree. > Regarding ACPI, the bug is in Tegra264 only, and Tegra264 is > device-tree-only. It doesn't support ACPI/IORT as of now. Let's add a note in the commit message. Nicolin