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Mon, 23 Feb 2026 22:42:00 -0800 From: Akhil R To: CC: , , , , , , , , , , , , Subject: Re: [PATCH 1/8] dt-bindings: dma: nvidia,tegra186-gpc-dma: Add iommu-map property Date: Tue, 24 Feb 2026 12:11:59 +0530 Message-ID: <20260224064159.49442-1-akhilrajeev@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF00003443:EE_|IA0PR12MB7752:EE_ X-MS-Office365-Filtering-Correlation-Id: bf99c402-9fe5-454a-f7a0-08de736fd624 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|7416014|376014|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?yaGhku4IXE3JlIaGlSJwUdf793UAqA0NVn6UuhT3W5LhSRK6+dy1MTDr3Til?= =?us-ascii?Q?LIJEhhXsVqMaW1mOwHmftcWIUayGxcrJI6cKxgVDLiDMBiBo99f3oGHtIkva?= =?us-ascii?Q?LBtmTId1ATHBX5yOmUd2Wg83wDE9hH9B4MljsLnLg+ubRvcbRKsYQuyxlywU?= =?us-ascii?Q?DaXvRb1lMfWPz/m5ICgKqSe3F8ZeG/qL3cT9rQssqk6L8WC81mrT4Pm00LHh?= =?us-ascii?Q?4YxMU9UF5AxYbS9M8/8lr5Y9cnRm16fTPjO6LST7lXyjZGEl0E+6BbAeI01g?= =?us-ascii?Q?ZnOzzsprE9gojHpsii2gmVToURP/wmjQIYMYuSXwxAtPrlJutAgtZWU5WpNr?= =?us-ascii?Q?yHCkHvp8umf4CdqWliz1jZsPCHdf0tJtRCVeFRdJBBetdx7x0nFakKiUjWlf?= =?us-ascii?Q?yRaz03/2gtvSURTMD2uqdbmXx+UK99lLWbYiWvZ2i/Ufkr4TOs1+fOMA2ieU?= =?us-ascii?Q?V/nXwJKw9fi7aXd/6aVo+jzbW4R3XFtRbbArHj+NtaXyeXoH9j2XNOHDZ4rS?= =?us-ascii?Q?7u6/+2hoEcH/LmXf/2Ul8T00Nbnx6GoBCSSOo/ttXK20kCNQtfbw7qKTMWhb?= =?us-ascii?Q?u5UVdARzfhqDVXTjvP8Zu4noxxr73QYpmS3pMZF6fUm2X0rvf1o2FwKPXNEi?= =?us-ascii?Q?jOIwe0PIegDDPG9yPcZk1eTzdPG9YWdogOgX/G/dV0WF1pYlTAtwoBmlp8LP?= =?us-ascii?Q?izLbffF1Z5DNV9JZDcGnywtZMO+kZ0d0PzG7QoWVGCzrulT6mG/TfxKAjopN?= =?us-ascii?Q?00iU6CgoVvVBOPVorN5K14z5QNBzH0yWEWlJt1tTOyNkzOky6I7lDA5uMGxQ?= =?us-ascii?Q?mbNGHl2qUISRaf1RElBmszpNFYtIS4RcZ/MzK9xNfbORrAZPZToyrOfD0vAk?= =?us-ascii?Q?m+BP6b9ge9R7wFAZ8grucv6WQ3eB7dlUg+9wpOcL/RNJKJied3OzXOqHdDLU?= =?us-ascii?Q?Gap/z2TaHjAHhLGOL33HPQbkL+m60Vv/NV1F2/zPY7AMiLSnAb7kRUX5XLzR?= =?us-ascii?Q?wNu4S305k1sflzuWihmCNHgJOoFLjDkZHFAkBZ0wIO/Hb9sT1Cd2IIsw0a+g?= =?us-ascii?Q?UAzFyhvCMpjLXkyAi+6fzMIgDPqKQdOMySjb4VT1oEXZlSqJoln1Xq/PbeQU?= =?us-ascii?Q?0IJLGFycw/2099v/s3GZKo6kLogW10JpEEIgyDZ8GhaJQYuUXpdqzRmMxJgl?= =?us-ascii?Q?llrKdeHA5Z8oIaRotedI8N4knkVb4n2QSZ1fgVBO9YOvKdCl8TLN5NzHrKf2?= =?us-ascii?Q?4ow+e1CuxkwIIfueudGnzsF6WitZcGfMui8nyqi+7zmGD6P6w3DiZ3HeF/Pr?= =?us-ascii?Q?PAQI0zTyFhZXALOLQzbdShABDOpUfeI1/GtG0pdJDS3WIRm81VysUu+DGGcP?= =?us-ascii?Q?J8HIWjf2tgQzh88c1viWfpNpzGez9HEX3h7K/ekxVLHjk0JhxccAUUBEpoZ6?= =?us-ascii?Q?w5m15eLIvaWedVTzx/zDl+ihzgZoVVJtYXFaAZXV5Ejcbhws1NcPBso6jH/+?= =?us-ascii?Q?aOTu/QqQLyiV++8eNTnjIQYHQ7MN7/44DVZG2EqNZuky+T8NSOUTVdwRKW7T?= =?us-ascii?Q?ENez/H33dtLpRFdbkkQNxIaShl1Xha5hqR48u/I5T6uXAJmePdrLbS7rBRu/?= =?us-ascii?Q?Ywz8wk+lGaygCZKAWTE6PtyUINhWDXoCDb1Sfwk+WkPXJhJo7rerau3ksSTI?= =?us-ascii?Q?j2a1YA=3D=3D?= 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)(82310400026)(1800799024)(7416014)(376014)(36860700013);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: sMm4K3aLTHkG20nA1NDAylJFfuHSz657B9vK3RkGQsFHyAYEEZAnVubN/tQp0TRF0rICxsHlHiV4rz6ivlvUjUBvQosLgVJPkPmMt5lVOEz/ZlGDvwb9kzim80sGehGGGBvJdq/nuOD8seJRZQRuxcKQ6h3gme7maw/Nu9bNpBhM+a/EZj4WXRDK31K4uTI34ZZVGacEuDWEqHIo+VkHvo/7lJ8oDyfd9tPZDCrAfum6Rw1wpbKLTutqc3MNDJZC6mT7ZGEH6gETGhWR3ZEGp2w4ADxPi5NrDVa2lFM9VYOEcAV8SXOwcFYLMQlRk+WeWsGXLFGo1xgKBKUHb9j1fL4OWczrWPXPyvEE0N8LYTIDi2w8+uLBBpGOmmFlu0vCfjH33EXoynEp5Vgt/r2AYLzh/pE6VtspnfhhQmDKpCqKnE4a457QN1IzsToi/pKs X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2026 06:42:10.3378 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bf99c402-9fe5-454a-f7a0-08de736fd624 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: DS2PEPF00003443.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7752 On Wed, 18 Feb 2026 09:49:28 -0600, Rob Herring wrote: > On Wed, Feb 18, 2026 at 3:59 AM Jon Hunter wrote: >> >> >> On 17/02/2026 19:53, Krzysztof Kozlowski wrote: >>> On 17/02/2026 18:34, Akhil R wrote: >>>> Add iommu-map property which helps when each channel requires its own >>>> stream ID for the transfer. Use iommu-map to specify separate stream >>>> ID for each channel. This enables each channel to be in its own iommu >>>> domain and keeps the memory isolated from other devices sharing the >>>> same DMA controller. >>>> >>>> Signed-off-by: Akhil R >>>> --- >>>> .../devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml | 8 ++++++++ >>>> 1 file changed, 8 insertions(+) >>>> >>>> diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml >>>> index 0dabe9bbb219..542e9cb9f641 100644 >>>> --- a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml >>>> +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml >>>> @@ -14,6 +14,7 @@ description: | >>>> maintainers: >>>> - Jon Hunter >>>> - Rajesh Gumasta >>>> + - Akhil R >>> >>> With 4.5 trillion USD capitalization of Nvidia one could assume they can >>> spare few resources to test the patch before sending it... instead of >>> relying on Rob's and my machines to do that for them. >>> >>> Expect grumpy review because you do not care about our time. >> >> >> ACK! We need to do a better job here. I will work with Akhil to improve >> this. > > Anyone that wants to run a gitlab-runner (and docker) on one of their > machines to add to the test capacity would be more than welcomed. It's > pretty trivial to set up. The only requirement is something faster > than gitlab shared runners. My 2 machines are M1 and M3 MBPs. I did not realise that the system I used had a very old version of dtschema where these errors did not show up. I do see them now once I upgraded the dtschema. Will fix these and test them in the next revision. Regards, Akhil