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-rw-r--r--Documentation/trace/events-power.rst1
-rw-r--r--drivers/cpufreq/cpufreq.c1
-rw-r--r--include/trace/events/power.h25
3 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/trace/events-power.rst b/Documentation/trace/events-power.rst
index a77daca75e30..2ef318962e29 100644
--- a/Documentation/trace/events-power.rst
+++ b/Documentation/trace/events-power.rst
@@ -27,6 +27,7 @@ cpufreq.
cpu_idle "state=%lu cpu_id=%lu"
cpu_frequency "state=%lu cpu_id=%lu"
+ cpu_frequency_limits "min=%lu max=%lu cpu_id=%lu"
A suspend event is used to indicate the system going in and out of the
suspend mode:
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index b0dfd3222013..52566f1f1050 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2236,6 +2236,7 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
policy->min = new_policy->min;
policy->max = new_policy->max;
+ trace_cpu_frequency_limits(policy);
policy->cached_target_freq = UINT_MAX;
diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index 908977d69783..f7aece721aed 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -5,6 +5,7 @@
#if !defined(_TRACE_POWER_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_POWER_H
+#include <linux/cpufreq.h>
#include <linux/ktime.h>
#include <linux/pm_qos.h>
#include <linux/tracepoint.h>
@@ -148,6 +149,30 @@ DEFINE_EVENT(cpu, cpu_frequency,
TP_ARGS(frequency, cpu_id)
);
+TRACE_EVENT(cpu_frequency_limits,
+
+ TP_PROTO(struct cpufreq_policy *policy),
+
+ TP_ARGS(policy),
+
+ TP_STRUCT__entry(
+ __field(u32, min_freq)
+ __field(u32, max_freq)
+ __field(u32, cpu_id)
+ ),
+
+ TP_fast_assign(
+ __entry->min_freq = policy->min;
+ __entry->max_freq = policy->max;
+ __entry->cpu_id = policy->cpu;
+ ),
+
+ TP_printk("min=%lu max=%lu cpu_id=%lu",
+ (unsigned long)__entry->min_freq,
+ (unsigned long)__entry->max_freq,
+ (unsigned long)__entry->cpu_id)
+);
+
TRACE_EVENT(device_pm_callback_start,
TP_PROTO(struct device *dev, const char *pm_ops, int event),