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Commit 8aa84ad8 authored by Thomas Renninger's avatar Thomas Renninger Committed by Dave Jones
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[CPUFREQ] Introduce global, not per core: /sys/devices/system/cpu/cpufreq 



Currently everything in the cpufreq layer is per core based.
This does not reflect reality, for example ondemand on conservative
governors have global sysfs variables.

Introduce a global cpufreq directory and add the kobject to the governor
struct, so that governors can easily access it.
The directory is initialized in the cpufreq_core_init initcall and thus will
always be created if cpufreq is compiled in, even if no cpufreq driver is
active later.

Signed-off-by: default avatarThomas Renninger <trenn@suse.de>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent 4bfa042c

drivers/cpufreq/cpufreq.c

+8 −1
Original line number Diff line number Diff line
@@ -686,6 +686,9 @@ static struct attribute *default_attrs[] = { 
	NULL

};



struct kobject *cpufreq_global_kobject;

EXPORT_SYMBOL(cpufreq_global_kobject);



#define to_policy(k) container_of(k, struct cpufreq_policy, kobj)

#define to_attr(a) container_of(a, struct freq_attr, attr)
@@ -1935,7 +1938,11 @@ static int __init cpufreq_core_init(void) 
		per_cpu(policy_cpu, cpu) = -1;

		init_rwsem(&per_cpu(cpu_policy_rwsem, cpu));

	}



	cpufreq_global_kobject = kobject_create_and_add("cpufreq",

						&cpu_sysdev_class.kset.kobj);

	BUG_ON(!cpufreq_global_kobject);



	return 0;

}



core_initcall(cpufreq_core_init);

include/linux/cpufreq.h

+10 −0
Original line number Diff line number Diff line
@@ -65,6 +65,9 @@ static inline int cpufreq_unregister_notifier(struct notifier_block *nb, 


struct cpufreq_governor;



/* /sys/devices/system/cpu/cpufreq: entry point for global variables */

extern struct kobject *cpufreq_global_kobject;



#define CPUFREQ_ETERNAL			(-1)

struct cpufreq_cpuinfo {

	unsigned int		max_freq;
@@ -274,6 +277,13 @@ struct freq_attr { 
	ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);

};



struct global_attr {

	struct attribute attr;

	ssize_t (*show)(struct kobject *kobj,

			struct attribute *attr, char *buf);

	ssize_t (*store)(struct kobject *a, struct attribute *b,

			 const char *c, size_t count);

};



/*********************************************************************

 *                        CPUFREQ 2.6. INTERFACE                     *