[PATCH 1/2] cpufreq: powernv: Adding fast_switch for schedutil
Akshay Adiga
akshay.adiga at linux.vnet.ibm.com
Mon Nov 7 18:32:04 AEDT 2016
Thanks Viresh for taking a look at it.
I will make the mentioned changes in the next version of the patch.
Regards
Akshay Adiga
On 11/04/2016 12:03 PM, Viresh Kumar wrote:
> On 04-11-16, 10:57, Akshay Adiga wrote:
>> Adding fast_switch which does light weight operation to
>> set the desired pstate.
>>
>> Signed-off-by: Akshay Adiga <akshay.adiga at linux.vnet.ibm.com>
>> ---
>> drivers/cpufreq/powernv-cpufreq.c | 22 +++++++++++++++++++++-
>> 1 file changed, 21 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
>> index d3ffde8..09a0496 100644
>> --- a/drivers/cpufreq/powernv-cpufreq.c
>> +++ b/drivers/cpufreq/powernv-cpufreq.c
>> @@ -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 +900,22 @@ 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);
>> + if (index < 0 || index >= powernv_pstate_info.nr_pstates)
>> + return CPUFREQ_ENTRY_INVALID;
> I don't think such a check is required at all. It wouldn't happen without a BUG
> in kernel.
>> + 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 +923,7 @@ 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,
>> --
>> 2.7.4
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