PM / QoS: Add pm_qos_request tracepoints

Adds tracepoints to pm_qos_add_request, pm_qos_update_request,
pm_qos_remove_request, and pm_qos_update_request_timeout.
It's useful for checking pm_qos_class, value, and timeout_us.

Signed-off-by: Sahara <keun-o.park@windriver.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 76 insertions, 0 deletions

diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index f1e73bd04beb..6411f924afb1 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -182,6 +182,77 @@ DEFINE_EVENT(power_domain, power_domain_target,
 /*
  * The pm qos events are used for pm qos update
  */
+DECLARE_EVENT_CLASS(pm_qos_request,
+
+        TP_PROTO(int pm_qos_class, s32 value),
+
+        TP_ARGS(pm_qos_class, value),
+
+        TP_STRUCT__entry(
+                __field( int,                    pm_qos_class   )
+                __field( s32,                    value          )
+        ),
+
+        TP_fast_assign(
+                __entry->pm_qos_class = pm_qos_class;
+                __entry->value = value;
+        ),
+
+        TP_printk("pm_qos_class=%s value=%d",
+                  __print_symbolic(__entry->pm_qos_class,
+                        { PM_QOS_CPU_DMA_LATENCY,       "CPU_DMA_LATENCY" },
+                        { PM_QOS_NETWORK_LATENCY,       "NETWORK_LATENCY" },
+                        { PM_QOS_NETWORK_THROUGHPUT,    "NETWORK_THROUGHPUT" }),
+                  __entry->value)
+);
+
+DEFINE_EVENT(pm_qos_request, pm_qos_add_request,
+
+        TP_PROTO(int pm_qos_class, s32 value),
+
+        TP_ARGS(pm_qos_class, value)
+);
+
+DEFINE_EVENT(pm_qos_request, pm_qos_update_request,
+
+        TP_PROTO(int pm_qos_class, s32 value),
+
+        TP_ARGS(pm_qos_class, value)
+);
+
+DEFINE_EVENT(pm_qos_request, pm_qos_remove_request,
+
+        TP_PROTO(int pm_qos_class, s32 value),
+
+        TP_ARGS(pm_qos_class, value)
+);
+
+TRACE_EVENT(pm_qos_update_request_timeout,
+
+        TP_PROTO(int pm_qos_class, s32 value, unsigned long timeout_us),
+
+        TP_ARGS(pm_qos_class, value, timeout_us),
+
+        TP_STRUCT__entry(
+                __field( int,                    pm_qos_class   )
+                __field( s32,                    value          )
+                __field( unsigned long,          timeout_us     )
+        ),
+
+        TP_fast_assign(
+                __entry->pm_qos_class = pm_qos_class;
+                __entry->value = value;
+                __entry->timeout_us = timeout_us;
+        ),
+
+        TP_printk("pm_qos_class=%s value=%d, timeout_us=%ld",
+                  __print_symbolic(__entry->pm_qos_class,
+                        { PM_QOS_CPU_DMA_LATENCY,       "CPU_DMA_LATENCY" },
+                        { PM_QOS_NETWORK_LATENCY,       "NETWORK_LATENCY" },
+                        { PM_QOS_NETWORK_THROUGHPUT,    "NETWORK_THROUGHPUT" }),
+                  __entry->value, __entry->timeout_us)
+);
+
 DECLARE_EVENT_CLASS(pm_qos_update,
 
         TP_PROTO(enum pm_qos_req_action action, int prev_value, int curr_value),
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 4fb8d1427938..06fe28589e9c 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -336,6 +336,7 @@ void pm_qos_add_request(struct pm_qos_request *req,
         }
         req->pm_qos_class = pm_qos_class;
         INIT_DELAYED_WORK(&req->work, pm_qos_work_fn);
+        trace_pm_qos_add_request(pm_qos_class, value);
         pm_qos_update_target(pm_qos_array[pm_qos_class]->constraints,
                              &req->node, PM_QOS_ADD_REQ, value);
 }
@@ -364,6 +365,7 @@ void pm_qos_update_request(struct pm_qos_request *req,
 
         cancel_delayed_work_sync(&req->work);
 
+        trace_pm_qos_update_request(req->pm_qos_class, new_value);
         if (new_value != req->node.prio)
                 pm_qos_update_target(
                         pm_qos_array[req->pm_qos_class]->constraints,
@@ -390,6 +392,8 @@ void pm_qos_update_request_timeout(struct pm_qos_request *req, s32 new_value,
 
         cancel_delayed_work_sync(&req->work);
 
+        trace_pm_qos_update_request_timeout(req->pm_qos_class,
+                                            new_value, timeout_us);
         if (new_value != req->node.prio)
                 pm_qos_update_target(
                         pm_qos_array[req->pm_qos_class]->constraints,
@@ -419,6 +423,7 @@ void pm_qos_remove_request(struct pm_qos_request *req)
 
         cancel_delayed_work_sync(&req->work);
 
+        trace_pm_qos_remove_request(req->pm_qos_class, PM_QOS_DEFAULT_VALUE);
         pm_qos_update_target(pm_qos_array[req->pm_qos_class]->constraints,
                              &req->node, PM_QOS_REMOVE_REQ,
                              PM_QOS_DEFAULT_VALUE);