trace: irq: Add next event trace

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

2 files changed, 32 insertions, 0 deletions

diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
index 1c41b74581f7..dc3c6f22fcb9 100644
--- a/include/trace/events/irq.h
+++ b/include/trace/events/irq.h
@@ -99,6 +99,35 @@ TRACE_EVENT(irq_handler_exit,
 		  __entry->irq, __entry->ret ? "handled" : "unhandled")
 );
 
+#ifdef CONFIG_IRQ_TIMINGS
+/**
+ * irq_timings_next_event - called when the next irq event is computed
+ * @irq: the irq number
+ * @ne: next event timeline in nanosec unit based
+ *
+ * If there is no event predicted at the moment this function is called,
+ * the next event is U64_MAX.
+ */
+TRACE_EVENT(irq_timings_next_event,
+
+	TP_PROTO(int irq, u64 ne),
+
+	TP_ARGS(irq, ne),
+
+	TP_STRUCT__entry(
+		__field(	int,		irq	)
+		__field(	u64,		ne	)
+	),
+
+	TP_fast_assign(
+		__entry->irq	= irq;
+		__entry->ne	= ne;
+	),
+
+	TP_printk("irq=%d next_event=%llu", __entry->irq, __entry->ne)
+);
+#endif
+
 DECLARE_EVENT_CLASS(softirq,
 
 	TP_PROTO(unsigned int vec_nr),
diff --git a/kernel/irq/timings.c b/kernel/irq/timings.c
index 2dba2e745302..d50736473600 100644
--- a/kernel/irq/timings.c
+++ b/kernel/irq/timings.c
@@ -363,6 +363,9 @@ u64 irq_timings_next_event(u64 now)
 		}
 	}
 
+	if (irq)
+		trace_irq_timings_next_event(irq, ne);
+
 	return ne;
 }