[PATCH v3 09/21] cpufreq: amd: add trace for amd-pstate module

[Huang Rui]

Add trace event to monitor the performance value changes which is
controlled by cpu governors.

Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
---
 drivers/cpufreq/amd-pstate.c |  4 ++++
 include/trace/events/power.h | 46 ++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index d399938d6d85..6037590e82a6 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -36,6 +36,7 @@
 #include <linux/delay.h>
 #include <linux/uaccess.h>
 #include <linux/static_call.h>
+#include <trace/events/power.h>
 
 #include <acpi/processor.h>
 #include <acpi/cppc_acpi.h>
@@ -189,6 +190,9 @@ static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
 	value &= ~REQ_MAX_PERF(~0L);
 	value |= REQ_MAX_PERF(max_perf);
 
+	trace_amd_pstate_perf(min_perf, des_perf, max_perf, cpudata->cpu,
+			      (value != prev), fast_switch);
+
 	if (value == prev)
 		return;
 
diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index af5018aa9517..c95c0b8d443d 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -173,6 +173,52 @@ TRACE_EVENT(cpu_frequency_limits,
 		  (unsigned long)__entry->cpu_id)
 );
 
+TRACE_EVENT(amd_pstate_perf,
+
+	TP_PROTO(unsigned long min_perf,
+		 unsigned long target_perf,
+		 unsigned long capacity,
+		 unsigned int cpu_id,
+		 bool changed,
+		 bool fast_switch
+		 ),
+
+	TP_ARGS(min_perf,
+		target_perf,
+		capacity,
+		cpu_id,
+		changed,
+		fast_switch
+		),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, min_perf)
+		__field(unsigned long, target_perf)
+		__field(unsigned long, capacity)
+		__field(unsigned int, cpu_id)
+		__field(bool, changed)
+		__field(bool, fast_switch)
+		),
+
+	TP_fast_assign(
+		__entry->min_perf = min_perf;
+		__entry->target_perf = target_perf;
+		__entry->capacity = capacity;
+		__entry->cpu_id = cpu_id;
+		__entry->changed = changed;
+		__entry->fast_switch = fast_switch;
+		),
+
+	TP_printk("amd_min_perf=%lu amd_des_perf=%lu amd_max_perf=%lu cpu_id=%u changed=%s fast_switch=%s",
+		  (unsigned long)__entry->min_perf,
+		  (unsigned long)__entry->target_perf,
+		  (unsigned long)__entry->capacity,
+		  (unsigned int)__entry->cpu_id,
+		  (__entry->changed) ? "true" : "false",
+		  (__entry->fast_switch) ? "true" : "false"
+		 )
+);
+
 TRACE_EVENT(device_pm_callback_start,
 
 	TP_PROTO(struct device *dev, const char *pm_ops, int event),
-- 
2.25.1