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Tue, 7 Jul 2026 16:20:59 -0700 Date: Tue, 7 Jul 2026 16:20:58 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , "Joerg Roedel (AMD)" , Jean-Philippe Brucker , , Robin Murphy , Will Deacon , David Matlack , "Pasha Tatashin" , , "Pranjal Shrivastava" , Samiullah Khawaja , Mostafa Saleh Subject: Re: [PATCH v2 8/8] iommu/arm-smmu-v3: Support the DS expansion of RIL's SCALE Message-ID: References: <0-v2-43074a57a53a+fb95-smmu_tlbi_jgg@nvidia.com> <8-v2-43074a57a53a+fb95-smmu_tlbi_jgg@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <8-v2-43074a57a53a+fb95-smmu_tlbi_jgg@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000ECD9:EE_|DS0PR12MB8504:EE_ X-MS-Office365-Filtering-Correlation-Id: 619bb7ab-4b58-4358-2560-08dedc7e7117 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|7416014|36860700016|1800799024|82310400026|56012099006|4143699003|11063799006|22082099003|18002099003|3023799007; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: M1alDuiBNP0VcOnGIsTEwiXua/JVcVGv8NLdnCJE6q9kc/0OakLiEiwIcEksTeZFOamW73/6c2pjrXp7lK7Y6whcyQgOIj9mh4EDCEaQs7bWRAcQlc9ZM1vJNvL433mYGyAbF9bC9YhlZscSkRHiuAOXY+GZKKHuTGhqQSLjrTs/SylcDeakegbqGFkqZaXPIUceoAHodSSJwTd/vx0koM3sUyheD+uniBl6VP05grDdiH0mVOR9WY0ji58IsL27fhV5lbfKxqUE/6ZeDbevkNSAZDPp+9OHT8CiZ2HGVqERFQ5+GMqPCGwDqzCvaq9Ye7lRYdFVeQXL2AuQvws0lQt81UfUx9XD7d7NHwg8hGqDnGA3X6wdNxFYM2dXoC5Q8I3rZ4RL9fcZkrjdqO46lh1CJr4y/zmSpp3b/ZfobQr4sMued4WYoK0MSa56OJhw X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2026 23:21:15.2632 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 619bb7ab-4b58-4358-2560-08dedc7e7117 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: MN1PEPF0000ECD9.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8504 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260707_162123_493225_6C9E3396 X-CRM114-Status: GOOD ( 11.34 ) 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 Mon, Jul 06, 2026 at 01:26:45PM -0300, Jason Gunthorpe wrote: > If DS is supported then SCALE can go up to 39. Detect the IDR and compute > a scale max that is compatible for the entire invs list. > > Signed-off-by: Jason Gunthorpe Reviewed-by: Nicolin Chen > @@ -5235,6 +5242,9 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu) > /* Maximum number of outstanding stalls */ > smmu->evtq.max_stalls = FIELD_GET(IDR5_STALL_MAX, reg); > > + if (reg & IDR5_DS) > + smmu->features |= ARM_SMMU_FEAT_DS; > + Just a note here: This somehow conflicts with my iommufd_invalidation_loop series where we sanitize user space commands, because the driver would support IDR5.DS. So, one of the series would need a rebase. Nicolin