linux-kernel - [PATCH v10 0/2] coresight: Add Coresight Trace Network On Chip driver

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Message-ID: <20250611-trace-noc-v10-0-a83b5c63da34@quicinc.com>
Date: Wed, 11 Jun 2025 18:42:20 +0800
From: Yuanfang Zhang <quic_yuanfang@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach
	<mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Alexander Shishkin
	<alexander.shishkin@...ux.intel.com>
CC: <kernel@....qualcomm.com>, <linux-arm-msm@...r.kernel.org>,
        <coresight@...ts.linaro.org>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Yuanfang Zhang
	<quic_yuanfang@...cinc.com>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski@...aro.org>,
        Leo Yan <leo.yan@....com>
Subject: [PATCH v10 0/2] coresight: Add Coresight Trace Network On Chip
 driver

The Trace Network On Chip (TNOC) is an integration hierarchy which is a
hardware component that integrates the functionalities of TPDA and
funnels. It collects trace from subsystems and transfers it to coresight
sink.

In addition to the generic TNOC mentioned above, there is also a special type
of TNOC called Interconnect TNOC. Unlike the generic TNOC, the Interconnect
TNOC doesn't need ATID. Its primary function is to connect the source of
subsystems to the Aggregator TNOC. Its driver is different from this patch and
will describe it and upstream its driver separately.

Signed-off-by: Yuanfang Zhang <quic_yuanfang@...cinc.com>
---
Changes in v10:
- Rebase to coresight/next branch.
- Link to v9: https://lore.kernel.org/r/20250611-trace-noc-v9-0-4322d4cf8f4b@quicinc.com

Changes in v9:
- Mention the binding is only for Aggregator TNOC.
- Link to v8: https://lore.kernel.org/r/20250606-trace-noc-v8-0-833f94712c57@quicinc.com

Changes in v8:
- Add sysfs node to expose atid.
- Link to v7: https://lore.kernel.org/r/20250523-trace-noc-v7-0-d65edbab2997@quicinc.com

Changes in v7:
- Move the content in header file into coresight-tnoc.c.
- Use scoped_guard() to replace spin_lock().
- Invoke coresight_trace_id_put_system_id() for registration failure.
- Link to v6: https://lore.kernel.org/r/20250522-trace-noc-v6-0-f5a9bcae90ee@quicinc.com

Changes in v6:
- Add a newline after return statements.
- Use 'x &= foo' to replace 'x = x & foo'.
- Use 'x |= foo' to replace 'x = x | foo'.
- Link to v5: https://lore.kernel.org/r/20250512-trace-noc-v5-0-f2ef070baee5@quicinc.com

Changes in v5:
- update cover-letter to describe the Interconnect TNOC.
- Link to v4: https://lore.kernel.org/r/20250415-trace-noc-v4-0-979938fedfd8@quicinc.com

Changes in v4:
- Fix dt_binding warning.
- update mask of trace_noc amba_id.
- Modify driver comments.
- rename TRACE_NOC_SYN_VAL to TRACE_NOC_SYNC_INTERVAL.
- Link to v3: https://lore.kernel.org/r/20250411-trace-noc-v3-0-1f19ddf7699b@quicinc.com

Changes in v3:
- Remove unnecessary sysfs nodes.
- update commit messages.
- Use 'writel' instead of 'write_relaxed' when writing to the register for the last time.
- Add trace_id ops.
- Link to v2: https://lore.kernel.org/r/20250226-trace-noc-driver-v2-0-8afc6584afc5@quicinc.com

Changes in v2:
- Modified the format of DT binging file.
- Fix compile warnings.
- Link to v1: https://lore.kernel.org/r/46643089-b88d-49dc-be05-7bf0bb21f847@quicinc.com

---
Yuanfang Zhang (2):
      dt-bindings: arm: Add device Trace Network On Chip definition
      coresight: add coresight Trace Network On Chip driver

 .../bindings/arm/qcom,coresight-tnoc.yaml          | 113 ++++++++++
 drivers/hwtracing/coresight/Kconfig                |  12 +
 drivers/hwtracing/coresight/Makefile               |   1 +
 drivers/hwtracing/coresight/coresight-tnoc.c       | 242 +++++++++++++++++++++
 4 files changed, 368 insertions(+)
---
base-commit: 408c97c4a5e0b634dcd15bf8b8808b382e888164
change-id: 20250403-trace-noc-f8286b30408e

Best regards,
-- 
Yuanfang Zhang <quic_yuanfang@...cinc.com>