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cpufreq: powernv: Restore cpu frequency to policy->cur on unthrottling 

If frequency is throttled due to OCC reset then cpus will be in Psafe
frequency, so restore the frequency on all cpus to policy->cur when
OCCs are active again. And if frequency is throttled due to Pmax
capping then restore the frequency of all the cpus  in the chip on
unthrottling.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Shilpasri G Bhat 2015-07-16 13:34:23 +05:30 committed by Rafael J. Wysocki
parent 3dd3ebe5bb
commit 227942809b
1 changed files with 29 additions and 2 deletions
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31
drivers/cpufreq/powernv-cpufreq.c
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@ -48,6 +48,7 @@ static struct chip {
bool throttled;
cpumask_t mask;
struct work_struct throttle;
bool restore;
} *chips;
static int nr_chips;
@ -415,9 +416,29 @@ static struct notifier_block powernv_cpufreq_reboot_nb = {
void powernv_cpufreq_work_fn(struct work_struct *work)
{
struct chip *chip = container_of(work, struct chip, throttle);
unsigned int cpu;
cpumask_var_t mask;
smp_call_function_any(&chip->mask,
powernv_cpufreq_throttle_check, NULL, 0);
if (!chip->restore)
return;
chip->restore = false;
cpumask_copy(mask, &chip->mask);
for_each_cpu_and(cpu, mask, cpu_online_mask) {
int index, tcpu;
struct cpufreq_policy policy;
cpufreq_get_policy(&policy, cpu);
cpufreq_frequency_table_target(&policy, policy.freq_table,
policy.cur,
CPUFREQ_RELATION_C, &index);
powernv_cpufreq_target_index(&policy, index);
for_each_cpu(tcpu, policy.cpus)
cpumask_clear_cpu(tcpu, mask);
}
}
static char throttle_reason[][30] = {
@ -469,8 +490,10 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
throttled = false;
pr_info("OCC: Active\n");
for (i = 0; i < nr_chips; i++)
for (i = 0; i < nr_chips; i++) {
chips[i].restore = true;
schedule_work(&chips[i].throttle);
}
return 0;
}
@ -487,8 +510,11 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
return 0;
for (i = 0; i < nr_chips; i++)
if (chips[i].id == omsg.chip)
if (chips[i].id == omsg.chip) {
if (!omsg.throttle_status)
chips[i].restore = true;
schedule_work(&chips[i].throttle);
}
}
return 0;
}
@ -542,6 +568,7 @@ static int init_chip_info(void)
chips[i].throttled = false;
cpumask_copy(&chips[i].mask, cpumask_of_node(chip[i]));
INIT_WORK(&chips[i].throttle, powernv_cpufreq_work_fn);
chips[i].restore = false;
}
return 0;