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@xxxxxxxxxx>
---
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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