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    Subject[RFC PATCH 03/20] coresight: etm3x: implementing 'cpu_id()' API
    Date
    Adding an interface to lookup the CPU a tracer has been affined
    to along with a source operation allowing external customers to
    access it.

    Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
    ---
    drivers/hwtracing/coresight/coresight-etm3x.c | 14 ++++++++++++++
    include/linux/coresight.h | 3 +++
    2 files changed, 17 insertions(+)

    diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
    index a44bc3532585..4ce9cfc06e93 100644
    --- a/drivers/hwtracing/coresight/coresight-etm3x.c
    +++ b/drivers/hwtracing/coresight/coresight-etm3x.c
    @@ -441,6 +441,19 @@ static void etm_config_enable(void *info)
    spin_unlock(&drvdata->spinlock);
    }

    +static int etm_cpu_id(struct coresight_device *csdev)
    +{
    + int cpu;
    + unsigned long flags;
    + struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
    +
    + spin_lock_irqsave(&drvdata->spinlock, flags);
    + cpu = drvdata->cpu;
    + spin_unlock_irqrestore(&drvdata->spinlock, flags);
    +
    + return cpu;
    +}
    +
    static int etm_trace_id(struct coresight_device *csdev)
    {
    struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
    @@ -536,6 +549,7 @@ 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,
    .is_enabled = etm_is_enabled,
    .configure = etm_configure,
    diff --git a/include/linux/coresight.h b/include/linux/coresight.h
    index d16e874079b7..9fe2ccf1cc36 100644
    --- a/include/linux/coresight.h
    +++ b/include/linux/coresight.h
    @@ -205,6 +205,8 @@ 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.
    * @is_enabled: returns whether a source has been enabled or not.
    @@ -216,6 +218,7 @@ struct coresight_ops_link {
    * @poweroff: switch off power to a source.
    */
    struct coresight_ops_source {
    + int (*cpu_id)(struct coresight_device *csdev);
    int (*trace_id)(struct coresight_device *csdev);
    bool (*is_enabled)(struct coresight_device *csdev);
    int (*configure)(struct coresight_device *csdev);
    --
    1.9.1


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