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Commit 247e9ee0 authored by Sahara's avatar Sahara Committed by Rafael J. Wysocki
Browse files

PM / QoS: Add pm_qos_update_target/flags tracepoints 



This patch adds tracepoints to pm_qos_update_target and
pm_qos_update_flags. It's useful for checking pm qos action,
previous value and current value.

Signed-off-by: default avatarSahara <keun-o.park@windriver.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent d30b82a4

include/trace/events/power.h

+51 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
#define _TRACE_POWER_H



#include <linux/ktime.h>

#include <linux/pm_qos.h>

#include <linux/tracepoint.h>



DECLARE_EVENT_CLASS(cpu,
@@ -177,6 +178,56 @@ DEFINE_EVENT(power_domain, power_domain_target, 


	TP_ARGS(name, state, cpu_id)

);



/*

 * The pm qos events are used for pm qos update

 */

DECLARE_EVENT_CLASS(pm_qos_update,



	TP_PROTO(enum pm_qos_req_action action, int prev_value, int curr_value),



	TP_ARGS(action, prev_value, curr_value),



	TP_STRUCT__entry(

		__field( enum pm_qos_req_action, action         )

		__field( int,                    prev_value     )

		__field( int,                    curr_value     )

	),



	TP_fast_assign(

		__entry->action = action;

		__entry->prev_value = prev_value;

		__entry->curr_value = curr_value;

	),



	TP_printk("action=%s prev_value=%d curr_value=%d",

		  __print_symbolic(__entry->action,

			{ PM_QOS_ADD_REQ,	"ADD_REQ" },

			{ PM_QOS_UPDATE_REQ,	"UPDATE_REQ" },

			{ PM_QOS_REMOVE_REQ,	"REMOVE_REQ" }),

		  __entry->prev_value, __entry->curr_value)

);



DEFINE_EVENT(pm_qos_update, pm_qos_update_target,



	TP_PROTO(enum pm_qos_req_action action, int prev_value, int curr_value),



	TP_ARGS(action, prev_value, curr_value)

);



DEFINE_EVENT_PRINT(pm_qos_update, pm_qos_update_flags,



	TP_PROTO(enum pm_qos_req_action action, int prev_value, int curr_value),



	TP_ARGS(action, prev_value, curr_value),



	TP_printk("action=%s prev_value=0x%x curr_value=0x%x",

		  __print_symbolic(__entry->action,

			{ PM_QOS_ADD_REQ,	"ADD_REQ" },

			{ PM_QOS_UPDATE_REQ,	"UPDATE_REQ" },

			{ PM_QOS_REMOVE_REQ,	"REMOVE_REQ" }),

		  __entry->prev_value, __entry->curr_value)

);

#endif /* _TRACE_POWER_H */



/* This part must be outside protection */

kernel/power/qos.c

+3 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ 


#include <linux/uaccess.h>

#include <linux/export.h>

#include <trace/events/power.h>



/*

 * locking rule: all changes to constraints or notifiers lists
@@ -202,6 +203,7 @@ int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node, 


	spin_unlock_irqrestore(&pm_qos_lock, flags);



	trace_pm_qos_update_target(action, prev_value, curr_value);

	if (prev_value != curr_value) {

		blocking_notifier_call_chain(c->notifiers,

					     (unsigned long)curr_value,
@@ -272,6 +274,7 @@ bool pm_qos_update_flags(struct pm_qos_flags *pqf, 


	spin_unlock_irqrestore(&pm_qos_lock, irqflags);



	trace_pm_qos_update_flags(action, prev_value, curr_value);

	return prev_value != curr_value;

}