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Subject[PATCH v3 1/2] cpufreq: powernv: Adding fast_switch for schedutil
Date
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: Akshay Adiga <akshay.adiga@linux.vnet.ibm.com>
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
---
Changes from v2 :
- No changes.
Changes from v1 :
- Removed unnecessary check for index out of bound.

drivers/cpufreq/powernv-cpufreq.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index d3ffde8..4a4380d 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 +900,20 @@ 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,
--
2.5.5
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