void cpuquiet_unregister_driver(struct cpuquiet_driver *drv)
{
unsigned int cpu;
if (drv != cpuquiet_curr_driver) {
WARN(1, "invalid cpuquiet_unregister_driver(%s)\n",
drv->name);
return;
}
mutex_lock(&cpuquiet_lock);
/* Stop current governor first */
cpuquiet_switch_governor(NULL);
cpuquiet_curr_driver = NULL;
for_each_possible_cpu(cpu) {
#ifdef CONFIG_CPUQUIET_STATS
kobject_put(&stats[cpu].cpu_kobject);
#endif
cpuquiet_remove_dev(cpu);
}
mutex_unlock(&cpuquiet_lock);
}
/*
* only after register we can check for the kernel
* config default governor and set it
*/
void cpuquiet_set_default_governor(struct cpuquiet_governor* gov)
{
#ifdef CONFIG_CPUQUIET_DEFAULT_GOV_BALANCED
if (!strnicmp("balanced", gov->name, CPUQUIET_NAME_LEN))
default_gov = gov;
#endif
#ifdef CONFIG_CPUQUIET_DEFAULT_GOV_RQ_STATS
if (!strnicmp("rq_stats", gov->name, CPUQUIET_NAME_LEN))
default_gov = gov;
#endif
#ifdef CONFIG_CPUQUIET_DEFAULT_GOV_RUNNABLE
if (!strnicmp("runnable", gov->name, CPUQUIET_NAME_LEN))
default_gov = gov;
#endif
#ifdef CONFIG_CPUQUIET_DEFAULT_GOV_MAKO_HOTPLUG
if (!strnicmp("mako_hotplug", gov->name, CPUQUIET_NAME_LEN))
default_gov = gov;
#endif
#ifdef CONFIG_CPUQUIET_DEFAULT_GOV_LOAD_STATS
if (!strnicmp("load_stats", gov->name, CPUQUIET_NAME_LEN))
default_gov = gov;
#endif
if (default_gov != NULL)
cpuquiet_switch_governor(default_gov);
}
int cpuquiet_register_driver(struct cpuquiet_driver *drv)
{
int err = -EBUSY;
unsigned int cpu;
struct device *dev;
if (!drv)
return -EINVAL;
#ifdef CONFIG_CPUQUIET_STATS
stats = kzalloc(nr_cpu_ids * sizeof(*stats), GFP_KERNEL);
if (!stats)
return -ENOMEM;
#endif
for_each_possible_cpu(cpu) {
#ifdef CONFIG_CPUQUIET_STATS
u64 cur_jiffies = get_jiffies_64();
stats[cpu].last_update = cur_jiffies;
if (cpu_online(cpu))
stats[cpu].up_down_count = 1;
#endif
dev = get_cpu_device(cpu);
if (dev) {
cpuquiet_add_dev(dev, cpu);
#ifdef CONFIG_CPUQUIET_STATS
cpuquiet_cpu_kobject_init(&stats[cpu].cpu_kobject,
&ktype_cpu_stats, "stats", cpu);
#endif
}
}
mutex_lock(&cpuquiet_lock);
if (!cpuquiet_curr_driver) {
err = 0;
cpuquiet_curr_driver = drv;
cpuquiet_switch_governor(cpuquiet_get_first_governor());
}
mutex_unlock(&cpuquiet_lock);
return err;
}