linux-kernel - [PATCH v2 0/3] coresight: Add preferred trace id support

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Message-ID: <20240603094354.2348-1-quic_jinlmao@quicinc.com>
Date: Mon, 3 Jun 2024 02:43:49 -0700
From: Mao Jinlong <quic_jinlmao@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach
	<mike.leach@...aro.org>, James Clark <james.clark@....com>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Mao Jinlong <quic_jinlmao@...cinc.com>,
        "Alexander
 Shishkin" <alexander.shishkin@...ux.intel.com>
CC: <coresight@...ts.linaro.org>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Tao Zhang
	<quic_taozha@...cinc.com>,
        songchai <quic_songchai@...cinc.com>
Subject: [PATCH v2 0/3] coresight: Add preferred trace id support

Some HW has static trace id which cannot be changed via
software programming. For this case, configure the trace id
in device tree with "trace-id = <xxx>", and
call coresight_trace_id_get_system_id with the trace id value
in device probe function. The id will be reserved for the HW
all the time if the device is probed.

Changes since V1:
1. Add argument to coresight_trace_id_get_system_id for preferred id
instead of adding new function coresight_trace_id_reserve_system_id.
2. Add constraint to trace-id in dt-binding file.

Mao Jinlong (3):
  dt-bindings: arm: Add trace-id for coresight dummy source
  coresight: Add support to get preferred id for system trace sources
  coresight: dummy: Add reserve atid support for dummy source

 .../sysfs-bus-coresight-devices-dummy-source  | 15 +++++
 .../arm/arm,coresight-dummy-source.yaml       |  6 ++
 drivers/hwtracing/coresight/coresight-dummy.c | 58 +++++++++++++++++--
 .../hwtracing/coresight/coresight-platform.c  | 26 +++++++++
 drivers/hwtracing/coresight/coresight-stm.c   |  2 +-
 .../hwtracing/coresight/coresight-trace-id.c  | 32 ++++++----
 .../hwtracing/coresight/coresight-trace-id.h  |  5 +-
 include/linux/coresight.h                     |  1 +
 8 files changed, 128 insertions(+), 17 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source

-- 
2.41.0