linux-kernel - [PATCH v1] PM / Domains: Add tracepoints

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Date:   Thu, 26 Sep 2019 15:04:38 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>, linux-pm@...r.kernel.org,
        Amit Kucheria <amit.kucheria@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1] PM / Domains: Add tracepoints

Define genpd_power_on/off and genpd_set_performance_state
tracepoints and use them.

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---

 drivers/base/power/domain.c  | 27 +++++++++++++++++---
 include/trace/events/power.h | 49 ++++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+), 4 deletions(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index cc85e87eaf05..aee988c112e5 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -21,6 +21,7 @@
 #include <linux/suspend.h>
 #include <linux/export.h>
 #include <linux/cpu.h>
+#include <trace/events/power.h>
 
 #include "power.h"
 
@@ -329,6 +330,9 @@ static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
 		goto err;
 
 	genpd->performance_state = state;
+
+	trace_genpd_set_performance_state(genpd);
+
 	return 0;
 
 err:
@@ -418,14 +422,21 @@ static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
 	if (!genpd->power_on)
 		return 0;
 
-	if (!timed)
-		return genpd->power_on(genpd);
+	if (!timed) {
+		ret = genpd->power_on(genpd);
+		if (!ret)
+			trace_genpd_power_on(genpd);
+
+		return ret;
+	}
 
 	time_start = ktime_get();
 	ret = genpd->power_on(genpd);
 	if (ret)
 		return ret;
 
+	trace_genpd_power_on(genpd);
+
 	elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
 	if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)
 		return ret;
@@ -448,14 +459,22 @@ static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
 	if (!genpd->power_off)
 		return 0;
 
-	if (!timed)
-		return genpd->power_off(genpd);
+	if (!timed) {
+		ret = genpd->power_off(genpd);
+		if (!ret)
+			trace_genpd_power_off(genpd);
+
+		return ret;
+	}
 
 	time_start = ktime_get();
 	ret = genpd->power_off(genpd);
 	if (ret)
 		return ret;
 
+	if (!ret)
+		trace_genpd_power_off(genpd);
+
 	elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
 	if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns)
 		return 0;
diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index 7457e238e1b7..de56cd1e8d0d 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -7,6 +7,7 @@
 
 #include <linux/cpufreq.h>
 #include <linux/ktime.h>
+#include <linux/pm_domain.h>
 #include <linux/pm_qos.h>
 #include <linux/tracepoint.h>
 #include <linux/trace_events.h>
@@ -525,6 +526,54 @@ DEFINE_EVENT(dev_pm_qos_request, dev_pm_qos_remove_request,
 
 	TP_ARGS(name, type, new_value)
 );
+
+#ifdef CONFIG_PM_GENERIC_DOMAINS
+DECLARE_EVENT_CLASS(genpd_power_on_off,
+	TP_PROTO(struct generic_pm_domain *genpd),
+
+	TP_ARGS(genpd),
+
+	TP_STRUCT__entry(
+		__string(name, genpd->name)
+	),
+
+	TP_fast_assign(
+		__assign_str(name, genpd->name);
+	),
+
+	TP_printk("name=%s", __get_str(name))
+);
+
+DEFINE_EVENT(genpd_power_on_off, genpd_power_on,
+	TP_PROTO(struct generic_pm_domain *genpd),
+
+	TP_ARGS(genpd)
+);
+
+DEFINE_EVENT(genpd_power_on_off, genpd_power_off,
+	TP_PROTO(struct generic_pm_domain *genpd),
+
+	TP_ARGS(genpd)
+);
+
+TRACE_EVENT(genpd_set_performance_state,
+	TP_PROTO(struct generic_pm_domain *genpd),
+
+	TP_ARGS(genpd),
+
+	TP_STRUCT__entry(
+		__string(name, genpd->name)
+		__field(unsigned int, state)
+	),
+
+	TP_fast_assign(
+		__assign_str(name, genpd->name);
+		__entry->state = genpd->performance_state;
+	),
+
+	TP_printk("name=%s state=%u", __get_str(name), __entry->state)
+);
+#endif /* CONFIG_PM_GENERIC_DOMAINS */
 #endif /* _TRACE_POWER_H */
 
 /* This part must be outside protection */
-- 
2.23.0.444.g18eeb5a265-goog