Commit 1c256245 authored by Thomas Renninger's avatar Thomas Renninger Committed by Dave Jones
Browse files

[CPUFREQ] allow ondemand and conservative cpufreq governors to be used as default 



Depending on the transition latency of the HW for cpufreq switches, the
ondemand or conservative governor cannot be used with certain cpufreq
drivers.  Still the ondemand should be the default governor on a wide range
of systems.  This patch allows this and lets the governor fallback to the
performance governor at cpufreq driver load time, if the driver does not
support fast enough frequency switching.

Main benefit is that on e.g.  installation or other systems without
userspace support a working dynamic cpufreq support can be achieved on most
systems by simply loading the cpufreq driver.  This is especially essential
for recent x86(_64) laptop hardware which may rely on working dynamic
cpufreq OS support.

Signed-off-by: default avatarThomas Renninger <trenn@suse.de>
Signed-off-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Bryan Wu <bryan.wu@analog.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent 8122c6ce

drivers/cpufreq/Kconfig

+23 −4
Original line number Diff line number Diff line
@@ -56,10 +56,6 @@ config CPU_FREQ_STAT_DETAILS 


	  If in doubt, say N.



# Note that it is not currently possible to set the other governors (such as ondemand)

# as the default, since if they fail to initialise, cpufreq will be

# left in an undefined state.



choice

	prompt "Default CPUFreq governor"

	default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110
@@ -85,6 +81,29 @@ config CPU_FREQ_DEFAULT_GOV_USERSPACE 
	  program shall be able to set the CPU dynamically without having

	  to enable the userspace governor manually.



config CPU_FREQ_DEFAULT_GOV_ONDEMAND

	bool "ondemand"

	select CPU_FREQ_GOV_ONDEMAND

	select CPU_FREQ_GOV_PERFORMANCE

	help

	  Use the CPUFreq governor 'ondemand' as default. This allows

	  you to get a full dynamic frequency capable system by simply

	  loading your cpufreq low-level hardware driver.

	  Be aware that not all cpufreq drivers support the ondemand

	  governor. If unsure have a look at the help section of the

	  driver. Fallback governor will be the performance governor.



config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE

	bool "conservative"

	select CPU_FREQ_GOV_CONSERVATIVE

	select CPU_FREQ_GOV_PERFORMANCE

	help

	  Use the CPUFreq governor 'conservative' as default. This allows

	  you to get a full dynamic frequency capable system by simply

	  loading your cpufreq low-level hardware driver.

	  Be aware that not all cpufreq drivers support the conservative

	  governor. If unsure have a look at the help section of the

	  driver. Fallback governor will be the performance governor.

endchoice



config CPU_FREQ_GOV_PERFORMANCE

drivers/cpufreq/cpufreq.c

+12 −0
Original line number Diff line number Diff line
@@ -1484,6 +1484,18 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, 
					unsigned int event)

{

	int ret;

	struct cpufreq_governor *gov = CPUFREQ_PERFORMANCE_GOVERNOR;



	if (policy->governor->max_transition_latency &&

	    policy->cpuinfo.transition_latency >

	    policy->governor->max_transition_latency) {

		printk(KERN_WARNING "%s governor failed, too long"

		       " transition latency of HW, fallback"

		       " to %s governor\n",

		       policy->governor->name,

		       gov->name);

		       policy->governor = gov;

	}



	if (!try_module_get(policy->governor->owner))

		return -EINVAL;

drivers/cpufreq/cpufreq_conservative.c

+9 −10
Original line number Diff line number Diff line
@@ -58,7 +58,7 @@ static unsigned int def_sampling_rate; 
#define DEF_SAMPLING_RATE_LATENCY_MULTIPLIER	(1000)

#define DEF_SAMPLING_DOWN_FACTOR		(1)

#define MAX_SAMPLING_DOWN_FACTOR		(10)

#define TRANSITION_LATENCY_LIMIT		(10 * 1000)

#define TRANSITION_LATENCY_LIMIT		(10 * 1000 * 1000)



static void do_dbs_timer(struct work_struct *work);
@@ -466,9 +466,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, 
		    (!policy->cur))

			return -EINVAL;



		if (policy->cpuinfo.transition_latency >

				(TRANSITION_LATENCY_LIMIT * 1000))

			return -EINVAL;

		if (this_dbs_info->enable) /* Already enabled */

			break;
@@ -551,15 +548,17 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, 
	return 0;

}



static struct cpufreq_governor cpufreq_gov_dbs = {

struct cpufreq_governor cpufreq_gov_conservative = {

	.name			= "conservative",

	.governor		= cpufreq_governor_dbs,

	.max_transition_latency	= TRANSITION_LATENCY_LIMIT,

	.owner			= THIS_MODULE,

};

EXPORT_SYMBOL(cpufreq_gov_conservative);



static int __init cpufreq_gov_dbs_init(void)

{

	return cpufreq_register_governor(&cpufreq_gov_dbs);

	return cpufreq_register_governor(&cpufreq_gov_conservative);

}



static void __exit cpufreq_gov_dbs_exit(void)
@@ -567,7 +566,7 @@ static void __exit cpufreq_gov_dbs_exit(void) 
	/* Make sure that the scheduled work is indeed not running */

	flush_scheduled_work();



	cpufreq_unregister_governor(&cpufreq_gov_dbs);

	cpufreq_unregister_governor(&cpufreq_gov_conservative);

}

drivers/cpufreq/cpufreq_ondemand.c

+9 −13
Original line number Diff line number Diff line
@@ -47,7 +47,7 @@ static unsigned int def_sampling_rate; 
			(def_sampling_rate / MIN_SAMPLING_RATE_RATIO)

#define MAX_SAMPLING_RATE			(500 * def_sampling_rate)

#define DEF_SAMPLING_RATE_LATENCY_MULTIPLIER	(1000)

#define TRANSITION_LATENCY_LIMIT		(10 * 1000)

#define TRANSITION_LATENCY_LIMIT		(10 * 1000 * 1000)



static void do_dbs_timer(struct work_struct *work);
@@ -508,12 +508,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, 
		if ((!cpu_online(cpu)) || (!policy->cur))

			return -EINVAL;



		if (policy->cpuinfo.transition_latency >

				(TRANSITION_LATENCY_LIMIT * 1000)) {

			printk(KERN_WARNING "ondemand governor failed to load "

			       "due to too long transition latency\n");

			return -EINVAL;

		}

		if (this_dbs_info->enable) /* Already enabled */

			break;
@@ -585,11 +579,13 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, 
	return 0;

}



static struct cpufreq_governor cpufreq_gov_dbs = {

struct cpufreq_governor cpufreq_gov_ondemand = {

	.name			= "ondemand",

	.governor		= cpufreq_governor_dbs,

	.max_transition_latency = TRANSITION_LATENCY_LIMIT,

	.owner			= THIS_MODULE,

};

EXPORT_SYMBOL(cpufreq_gov_ondemand);



static int __init cpufreq_gov_dbs_init(void)

{
@@ -598,12 +594,12 @@ static int __init cpufreq_gov_dbs_init(void) 
		printk(KERN_ERR "Creation of kondemand failed\n");

		return -EFAULT;

	}

	return cpufreq_register_governor(&cpufreq_gov_dbs);

	return cpufreq_register_governor(&cpufreq_gov_ondemand);

}



static void __exit cpufreq_gov_dbs_exit(void)

{

	cpufreq_unregister_governor(&cpufreq_gov_dbs);

	cpufreq_unregister_governor(&cpufreq_gov_ondemand);

	destroy_workqueue(kondemand_wq);

}

include/linux/cpufreq.h

+17 −3
Original line number Diff line number Diff line
@@ -155,6 +155,9 @@ struct cpufreq_governor { 
	char	name[CPUFREQ_NAME_LEN];

	int 	(*governor)	(struct cpufreq_policy *policy,

				 unsigned int event);

	unsigned int max_transition_latency; /* HW must be able to switch to

			next freq faster than this value in nano secs or we

			will fallback to performance governor */

	struct list_head	governor_list;

	struct module		*owner;

};
@@ -279,12 +282,23 @@ static inline unsigned int cpufreq_quick_get(unsigned int cpu) 
 *********************************************************************/





#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE

/*

  Performance governor is fallback governor if any other gov failed to

  auto load due latency restrictions

*/

extern struct cpufreq_governor cpufreq_gov_performance;

#define CPUFREQ_DEFAULT_GOVERNOR	&cpufreq_gov_performance

#define CPUFREQ_PERFORMANCE_GOVERNOR	(&cpufreq_gov_performance)

#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE

#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_performance)

#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)

extern struct cpufreq_governor cpufreq_gov_userspace;

#define CPUFREQ_DEFAULT_GOVERNOR	&cpufreq_gov_userspace

#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_userspace)

#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)

extern struct cpufreq_governor cpufreq_gov_ondemand;

#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_ondemand)

#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)

extern struct cpufreq_governor cpufreq_gov_conservative;

#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_conservative)

#endif

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