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[CPUFREQ] Introduce global, not per core: /sys/devices/system/cpu/cpufreq

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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: Thomas Renninger <trenn@suse.de>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Thomas Renninger 2009-07-24 15:25:05 +02:00 committed by Dave Jones
parent 4bfa042cd3
commit 8aa84ad8d6
2 changed files with 18 additions and 1 deletions
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9
drivers/cpufreq/cpufreq.c
View file

@ -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);

10
include/linux/cpufreq.h
View file

@ -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 *