On 26-02-16, 16:06, Shilpasri G Bhat wrote:
quoted hunk ↗ jump to hunk
+static int powernv_cpufreq_policy_notifier(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct cpufreq_policy *policy = data;
+ int ret;
+
+ if (action == CPUFREQ_CREATE_POLICY) {
+ ret = sysfs_create_group(&policy->kobj, &throttle_attr_grp);
+ if (ret)
+ pr_info("Failed to create throttle stats directory for cpu %d\n",
+ policy->cpu);
+ } else if (action == CPUFREQ_REMOVE_POLICY) {
+ sysfs_remove_group(&policy->kobj, &throttle_attr_grp);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block powernv_cpufreq_policy_nb = {
+ .notifier_call = powernv_cpufreq_policy_notifier,
+ .next = NULL,
+};
+
static void powernv_cpufreq_stop_cpu(struct cpufreq_policy *policy)
{
struct powernv_smp_call_data freq_data;@@ -603,6 +708,8 @@ static inline void clean_chip_info(void)
static inline void unregister_all_notifiers(void)
{
+ cpufreq_unregister_notifier(&powernv_cpufreq_policy_nb,
+ CPUFREQ_POLICY_NOTIFIER);
opal_message_notifier_unregister(OPAL_MSG_OCC,
&powernv_cpufreq_opal_nb);
unregister_reboot_notifier(&powernv_cpufreq_reboot_nb);@@ -628,6 +735,8 @@ static int __init powernv_cpufreq_init(void)
register_reboot_notifier(&powernv_cpufreq_reboot_nb);
opal_message_notifier_register(OPAL_MSG_OCC, &powernv_cpufreq_opal_nb);
+ cpufreq_register_notifier(&powernv_cpufreq_policy_nb,
+ CPUFREQ_POLICY_NOTIFIER);
rc = cpufreq_register_driver(&powernv_cpufreq_driver);
if (!rc)
@Rafael: This driver needs to do this *ugly* notifier hack, just because we
aren't doing kobject_add() for policy->kobj before ->init(). And we did that
because, we wanted to create the policyX structure with the first CPU in
policy->related_cpus mask and related_cpus mask isn't available until we call
->init()..
Should we do something in core to make this easier for this driver?
--
viresh