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Tue, 7 Jul 2026 19:10:39 -0700 Date: Tue, 7 Jul 2026 19:10:37 -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> <20260708000239.GN220801@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260708000239.GN220801@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS3PEPF000099E0:EE_|SA3PR12MB9197:EE_ X-MS-Office365-Filtering-Correlation-Id: affbc64a-6f48-4b68-09e3-08dedc962559 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|23010399003|82310400026|36860700016|7416014|22082099003|18002099003|56012099006|6133799003|11063799006|4143699003|3023799007; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 41hz39cUpXaqv2fvvNR8r+4nJQJ9TyLM+TE/ky0t1sui3aLTQnaP/AcPkRfHw+25kV0w2ICyYEH81XO/NCr++PYf6LyEsiF3GGNGTskwLUwzQEhwq1jCupQJoQDtKtTQqhcVN3gKjTC4A085OYJ18g/d3g3lIa1UUMsEqdq5cXHocsoHaOLWVXgvHwqGy0ezpDd8uMuFKr47URnONo7ALQTYCDeUaN01SrNFKRoyA9SWbg2fiea/A/6cincHdG16Ocv74DuLv42HE+DW1mj19hLgzVzGxxGm7vH9q4O2gwWX8+UoFHgYahfO41cmra7znqVzTVwtU3fZ8+xdauWg5dpVfBKwfvNPXagidej5/CyRlPIqFILusY0krwfzezD5wzbgPUjfjPEaOXU+kCCUPpqechG2KvKsCwYZ31sG2/bt8EQxbbUDbmTpq7PcRZt4 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2026 02:10:56.1480 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: affbc64a-6f48-4b68-09e3-08dedc962559 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS3PEPF000099E0.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB9197 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260707_191104_408276_ABFDC487 X-CRM114-Status: GOOD ( 22.07 ) 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 Tue, Jul 07, 2026 at 09:02:39PM -0300, Jason Gunthorpe wrote: > On Tue, Jul 07, 2026 at 04:20:58PM -0700, Nicolin Chen wrote: > > 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. > > Oh that's an interesting one. So if you add strict validation it will > technically break DS, no VMM can set DS to the vIOMMU as then it would > face invalid SCALE which the kernel will now block. > > Maybe these hunks need to be included in your series, I do expect it > to go first, and we should try to validate fully. OK. I can take the minimal DS part into my series. One more question to confirm: there are other fields like DS, which are defined in the spec but not supported by the driver. Should we expose them via hw_info while rejecting them via user cmds? Thanks Nicolin