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@xxxxxxx>
---
drivers/cpufreq/cpufreq.c | 8 +++++++-
include/linux/cpufreq.h | 10 ++++++++++
2 files changed, 17 insertions(+), 1 deletions(-)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index fa6dc2a..bccdebb 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -658,6 +658,8 @@ static struct attribute *default_attrs[] = {
NULL
};
+struct kobject *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)
@@ -1962,7 +1964,11 @@ 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);
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 642141a..336017a 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -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;
@@ -270,6 +273,13 @@ 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 *
--
1.6.0.2
--
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