@@ -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,
@@ -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);
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(+)