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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: FzUtrN0zbwZNL5+mvYhe8RluBSTWLniMGKdau/UHrISapgZmUiQfZWLyXPK9ZPIBY7bm3XoWHrmyomE1Lka6U8zKecAfJEqCW03IZ1CagzeNCtAMsokA0XyODMkLoHSRMUYNCxFosmEFke8o2B4NnCljfikrEo86EpatI0fHaW0/DOeuPuuQ0ofWO0UpzgSNDF7op/w+kEjZNNWFt76udlWPexXV8Lguc8vbs2eGILcO1HrF7hJqijbSHzgeWcHEyn75yEGJ54eTtT9eWmFJowP7oRt8tBmI8fe7mJdiMFTl+811yn6puK/c+64r1+8KN/YDggyXulF/kWwhPmLOTXXZiyRIU20rOg+T121OOJPJs+XXY+bn0OEEfh3yr9NbiSOnOQNIAwCdrT0LSIOJcRCTucRAuYV74yJzZkxaLbNo70DbpMJxPaBLU6fNJDH7 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Jun 2026 08:22:46.7150 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c55d7897-b78c-4ba4-6d03-08ded680c425 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DB3PEPF0000885D.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS2PR08MB9644 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260630_012303_400385_F63D0C75 X-CRM114-Status: GOOD ( 28.76 ) 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 30/06/2026 02:03, Jie Gan wrote: > > > On 6/29/2026 10:28 PM, Leo Yan wrote: >> On Mon, Jun 29, 2026 at 10:08:17AM +0800, Jie Gan wrote: >> >> [...] >> >>> Can I fix the issue by adding "arm,primecell-periphid" property. That's >>> would be the best temp solution as it avoids breaking the original >>> design of >>> both the TraceNoC AMBA driver and interconnect TraceNoC platform driver. >> >> Before proceeding with the "arm,primecell-periphid" property, could you >> clarify a bit: >> >>    - For an interconnect TraceNoC, what would be the consequence of >>      enabling ATID? Would it simply be a no-op, or are there any side >>      effects? Or is the concern that the trace IDs could be exhausted? >> > > TPDM0(or ATB source) -> interconnect TraceNoC0 -> Aggregator TraceNoc -> > sink > TPDM1(or ATB source) -> interconnect TraceNoC1 -> Aggregator TraceNoc -> > sink > > We only have one Aggregator TraceNoC and many interconnect TraceNoC > devices for one platform. All interconnect TraceNoC devices are > connected to Aggregator TraceNoC devices in the topology, so the itnoc > doesnt need an ATID. > > That's the design purpose from hardware perspective. > > >>    - How can you guarantee that a interconnect TraceNoC will never >>      require ATID in the future? >> > > The interconnect TraceNoC is primarily introduced to reduce routing > complexity in the hardware design. It is typically deployed as an > intermediate TraceNoC that connects to an Aggregator TraceNoC (AG > TraceNoC). You can always distinguish one from the other by checking the "compatibles" or even add a custom data field to the of_device_id table for the platform driver. Personally, I think it is better to keep things away from AMBA framework, when we get everything from platform driver. Cheers Suzuki > > For example, a modem subsystem may contain many TPDM devices. Directly > connecting every TPDM to the AG TraceNoC would result in significant > wiring complexity. Instead, an itnoc is placed within the modem > subsystem to locally aggregate the TPDM connections. All TPDMs first > connect to the itnoc, and the itnoc then connects to the system-level AG > TraceNoC. > > From a hardware perspective, there is no fundamental difference between > an itnoc and an AG TraceNoC. They use the same TraceNoC hardware > implementation and share the same AMBA bus type. The distinction is > purely functional: an itnoc is used for local trace aggregation within a > subsystem, whereas an AG TraceNoC serves as the top-level aggregation > point for the SoC. > > Thanks, > Jie > >>> The TraceNoC device here must be treated as an AMBA device and I am >>> continuing to investigate the issue with our hardware team. >> >>> We aim to fix it from hardware perspetive for existing platforms if >>> possible >>> and ensure it is fixed in future platforms. >> >> I'm concerned that all of use end up repeatedly fixing similar issues >> whenever hardware configurations change or modules are reused in >> different topologies. >> >> For example, if future platforms may require ATID support for an >> interconnect TraceNoC, then the issue will pop up again. >> >> Thanks, >> Leo >