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Commit 60c9efb8 authored by Akshay Adiga's avatar Akshay Adiga Committed by Rafael J. Wysocki
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cpufreq: powernv: Adding fast_switch for schedutil 



Adding fast_switch which does light weight operation to set the desired
pstate. Both global and local pstates are set to the same desired pstate.

Signed-off-by: default avatarAkshay Adiga <akshay.adiga@linux.vnet.ibm.com>
Reviewed-by: default avatarGautham R. Shenoy <ego@linux.vnet.ibm.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e7d040b8

drivers/cpufreq/powernv-cpufreq.c

+19 −1
Original line number Diff line number Diff line
@@ -752,9 +752,12 @@ static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy) 
	spin_lock_init(&gpstates->gpstate_lock);

	ret = cpufreq_table_validate_and_show(policy, powernv_freqs);



	if (ret < 0)

	if (ret < 0) {

		kfree(policy->driver_data);

		return ret;

	}



	policy->fast_switch_possible = true;

	return ret;

}
@@ -897,6 +900,20 @@ static void powernv_cpufreq_stop_cpu(struct cpufreq_policy *policy) 
	del_timer_sync(&gpstates->timer);

}



static unsigned int powernv_fast_switch(struct cpufreq_policy *policy,

					unsigned int target_freq)

{

	int index;

	struct powernv_smp_call_data freq_data;



	index = cpufreq_table_find_index_dl(policy, target_freq);

	freq_data.pstate_id = powernv_freqs[index].driver_data;

	freq_data.gpstate_id = powernv_freqs[index].driver_data;

	set_pstate(&freq_data);



	return powernv_freqs[index].frequency;

}



static struct cpufreq_driver powernv_cpufreq_driver = {

	.name		= "powernv-cpufreq",

	.flags		= CPUFREQ_CONST_LOOPS,
@@ -904,6 +921,7 @@ static struct cpufreq_driver powernv_cpufreq_driver = { 
	.exit		= powernv_cpufreq_cpu_exit,

	.verify		= cpufreq_generic_frequency_table_verify,

	.target_index	= powernv_cpufreq_target_index,

	.fast_switch	= powernv_fast_switch,

	.get		= powernv_cpufreq_get,

	.stop_cpu	= powernv_cpufreq_stop_cpu,

	.attr		= powernv_cpu_freq_attr,