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Commit e48a92d9 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti
Browse files

sched: walt: Bring back cpufreq based current frequency tracking 



When cycle counter is not available, we have to depend on the
cpufreq transition notifiers to track the current frequency.
This support was removed during HMP and WALT refactoring under
the assumption that it is not needed any more. However some
upcoming targets do not have cycle counter support, so bring
this feature back.

Change-Id: I3d900693d6cdb59a4756a44ccaefcd9e6df75c77
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent 0b005590

kernel/sched/walt.c

+51 −2
Original line number Diff line number Diff line
@@ -2338,10 +2338,59 @@ static struct notifier_block notifier_policy_block = { 
	.notifier_call = cpufreq_notifier_policy

};



static int cpufreq_notifier_trans(struct notifier_block *nb,

		unsigned long val, void *data)

{

	struct cpufreq_freqs *freq = (struct cpufreq_freqs *)data;

	unsigned int cpu = freq->cpu, new_freq = freq->new;

	unsigned long flags;

	struct sched_cluster *cluster;

	struct cpumask policy_cpus = cpu_rq(cpu)->freq_domain_cpumask;

	int i, j;



	if (use_cycle_counter)

		return NOTIFY_DONE;



	if (val != CPUFREQ_POSTCHANGE)

		return NOTIFY_DONE;



	if (cpu_cur_freq(cpu) == new_freq)

		return NOTIFY_OK;



	for_each_cpu(i, &policy_cpus) {

		cluster = cpu_rq(i)->cluster;



		for_each_cpu(j, &cluster->cpus) {

			struct rq *rq = cpu_rq(j);



			raw_spin_lock_irqsave(&rq->lock, flags);

			update_task_ravg(rq->curr, rq, TASK_UPDATE,

					 ktime_get_ns(), 0);

			raw_spin_unlock_irqrestore(&rq->lock, flags);

		}



		cluster->cur_freq = new_freq;

		cpumask_andnot(&policy_cpus, &policy_cpus, &cluster->cpus);

	}



	return NOTIFY_OK;

}



static struct notifier_block notifier_trans_block = {

	.notifier_call = cpufreq_notifier_trans

};



static int register_walt_callback(void)

{

	return cpufreq_register_notifier(&notifier_policy_block,

	int ret;



	ret = cpufreq_register_notifier(&notifier_policy_block,

					CPUFREQ_POLICY_NOTIFIER);

	if (!ret)

		ret = cpufreq_register_notifier(&notifier_trans_block,

						CPUFREQ_TRANSITION_NOTIFIER);



	return ret;

}

/*

 * cpufreq callbacks can be registered at core_initcall or later time.