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Commit 07f4f87f authored by Todd Poynor's avatar Todd Poynor Committed by Ruchi Kandoi
Browse files

cpufreq: interactive: Add sysfs boost interface for hints from userspace 



The explicit hint on/off version.

Change-Id: Ibf62b6d45bf6fb8c9c055b9bdaf074ce9374c04f
Signed-off-by: default avatarTodd Poynor <toddpoynor@google.com>
parent b9c1d7e6

Documentation/cpu-freq/governors.txt

+3 −0
Original line number Diff line number Diff line
@@ -267,6 +267,9 @@ not idle. Default is 20000 uS. 
input_boost: If non-zero, boost speed of all CPUs to hispeed_freq on

touchscreen activity.  Default is 0.



boost: If non-zero, immediately boost speed of all CPUs to

hispeed_freq.  If zero, allow CPU speeds to drop below hispeed_freq.





3. The Governor Interface in the CPUfreq Core

=============================================

drivers/cpufreq/cpufreq_interactive.c

+44 −4
Original line number Diff line number Diff line
@@ -31,12 +31,11 @@ 
#include <linux/mutex.h>

#include <linux/slab.h>

#include <linux/input.h>

#include <asm/cputime.h>



#define CREATE_TRACE_POINTS

#include <trace/events/cpufreq_interactive.h>



#include <asm/cputime.h>



static atomic_t active_count = ATOMIC_INIT(0);



struct cpufreq_interactive_cpuinfo {
@@ -94,7 +93,7 @@ static unsigned long timer_rate; 
static unsigned long above_hispeed_delay_val;



/*

 * Boost to hispeed on touchscreen input.

 * Boost pulse to hispeed on touchscreen input.

 */



static int input_boost_val;
@@ -106,6 +105,12 @@ struct cpufreq_interactive_inputopen { 


static struct cpufreq_interactive_inputopen inputopen;



/*

 * Non-zero means longer-term speed boost active.

 */



static int boost_val;



static int cpufreq_governor_interactive(struct cpufreq_policy *policy,

		unsigned int event);
@@ -189,7 +194,7 @@ static void cpufreq_interactive_timer(unsigned long data) 
	if (load_since_change > cpu_load)

		cpu_load = load_since_change;



	if (cpu_load >= go_hispeed_load) {

	if (cpu_load >= go_hispeed_load || boost_val) {

		if (pcpu->target_freq <= pcpu->policy->min) {

			new_freq = hispeed_freq;

		} else {
@@ -517,6 +522,12 @@ static void cpufreq_interactive_boost(void) 
		wake_up_process(up_task);

}



/*

 * Pulsed boost on input event raises CPUs to hispeed_freq and lets

 * usual algorithm of min_sample_time  decide when to allow speed

 * to drop.

 */



static void cpufreq_interactive_input_event(struct input_handle *handle,

					    unsigned int type,

					    unsigned int code, int value)
@@ -732,6 +743,34 @@ static ssize_t store_input_boost(struct kobject *kobj, struct attribute *attr, 


define_one_global_rw(input_boost);



static ssize_t show_boost(struct kobject *kobj, struct attribute *attr,

			  char *buf)

{

	return sprintf(buf, "%d\n", boost_val);

}



static ssize_t store_boost(struct kobject *kobj, struct attribute *attr,

			   const char *buf, size_t count)

{

	int ret;

	unsigned long val;



	ret = kstrtoul(buf, 0, &val);

	if (ret < 0)

		return ret;



	boost_val = val;



	if (boost_val)

		cpufreq_interactive_boost();

	else

		trace_cpufreq_interactive_unboost(hispeed_freq);



	return count;

}



define_one_global_rw(boost);



static struct attribute *interactive_attributes[] = {

	&hispeed_freq_attr.attr,

	&go_hispeed_load_attr.attr,
@@ -739,6 +778,7 @@ static struct attribute *interactive_attributes[] = { 
	&min_sample_time_attr.attr,

	&timer_rate_attr.attr,

	&input_boost.attr,

	&boost.attr,

	NULL,

};

include/trace/events/cpufreq_interactive.h

+13 −0
Original line number Diff line number Diff line
@@ -93,6 +93,19 @@ TRACE_EVENT(cpufreq_interactive_boost, 
	    ),

	    TP_printk("freq=%lu", __entry->freq)

);



TRACE_EVENT(cpufreq_interactive_unboost,

	    TP_PROTO(unsigned long freq),

	    TP_ARGS(freq),

	    TP_STRUCT__entry(

		    __field(unsigned long, freq)

	    ),

	    TP_fast_assign(

		    __entry->freq = freq;

	    ),

	    TP_printk("freq=%lu", __entry->freq)

);



#endif /* _TRACE_CPUFREQ_INTERACTIVE_H */



/* This part must be outside protection */