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    Subject[PATCH V6 05/26] coresight: etm3x: implementing 'cpu_id()' API
    Date
    Other than plainly parsing the device tree there is no way to
    know which CPU a tracer is affined to. As such adding an
    interface to lookup the CPU field enclosed in the etm_drvdata
    structure that was initialised at boot time.

    Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
    ---
    drivers/hwtracing/coresight/coresight-etm3x.c | 8 ++++++++
    include/linux/coresight.h | 3 +++
    2 files changed, 11 insertions(+)

    diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
    index b30add73c0ae..9dd88cf8f15c 100644
    --- a/drivers/hwtracing/coresight/coresight-etm3x.c
    +++ b/drivers/hwtracing/coresight/coresight-etm3x.c
    @@ -312,6 +312,13 @@ static void etm_enable_hw(void *info)
    dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu);
    }

    +static int etm_cpu_id(struct coresight_device *csdev)
    +{
    + struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
    +
    + return drvdata->cpu;
    +}
    +
    int etm_get_trace_id(struct etm_drvdata *drvdata)
    {
    unsigned long flags;
    @@ -439,6 +446,7 @@ static void etm_disable(struct coresight_device *csdev)
    }

    static const struct coresight_ops_source etm_source_ops = {
    + .cpu_id = etm_cpu_id,
    .trace_id = etm_trace_id,
    .enable = etm_enable,
    .disable = etm_disable,
    diff --git a/include/linux/coresight.h b/include/linux/coresight.h
    index a7cabfa23b55..bf62b265bf52 100644
    --- a/include/linux/coresight.h
    +++ b/include/linux/coresight.h
    @@ -205,12 +205,15 @@ struct coresight_ops_link {
    /**
    * struct coresight_ops_source - basic operations for a source
    * Operations available for sources.
    + * @cpu_id: returns the value of the CPU number this component
    + * is associated to.
    * @trace_id: returns the value of the component's trace ID as known
    to the HW.
    * @enable: enables tracing for a source.
    * @disable: disables tracing for a source.
    */
    struct coresight_ops_source {
    + int (*cpu_id)(struct coresight_device *csdev);
    int (*trace_id)(struct coresight_device *csdev);
    int (*enable)(struct coresight_device *csdev);
    void (*disable)(struct coresight_device *csdev);
    --
    2.1.4


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