Adding an interface to lookup the status of a tracer along with a source operation allowing external customers to access it.
Signed-off-by: Mathieu Poirier <[email protected]> --- drivers/hwtracing/coresight/coresight-etm3x.c | 13 +++++++++++++ include/linux/coresight.h | 2 ++ 2 files changed, 15 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c index 999c62a59c70..a44bc3532585 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x.c +++ b/drivers/hwtracing/coresight/coresight-etm3x.c @@ -374,6 +374,18 @@ static int etm_configure(struct coresight_device *csdev) etm_configure_cpu, csdev, 1); } +static bool etm_is_enabled(struct coresight_device *csdev) +{ + bool enabled; + struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + spin_lock(&drvdata->spinlock); + enabled = drvdata->enable; + spin_unlock(&drvdata->spinlock); + + return enabled; +} + /** * etm_trace_enable - enable ETM tracer * @csdev - the etm that needs to be enabled/disabled. @@ -525,6 +537,7 @@ static void etm_disable(struct coresight_device *csdev) static const struct coresight_ops_source etm_source_ops = { .trace_id = etm_trace_id, + .is_enabled = etm_is_enabled, .configure = etm_configure, .trace_enable = etm_trace_enable, .enable = etm_enable, diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 70f3dafa5194..d16e874079b7 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -207,6 +207,7 @@ struct coresight_ops_link { * Operations available for sources. * @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. * @configure: performs configuration for a source but doesn't enable it. * @trace_enable: enable/disable tracing on a source. * @enable: enables tracing for a source. @@ -216,6 +217,7 @@ struct coresight_ops_link { */ struct coresight_ops_source { int (*trace_id)(struct coresight_device *csdev); + bool (*is_enabled)(struct coresight_device *csdev); int (*configure)(struct coresight_device *csdev); int (*trace_enable)(struct coresight_device *csdev, bool enable); int (*enable)(struct coresight_device *csdev); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
