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authorShilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>2015-07-16 13:34:23 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-07-28 17:24:14 +0200
commit227942809b52f23cda414858b635c0285f11de00 (patch)
tree9ead4484e5679057df62d859a748f50a2716b437 /drivers/cpufreq
parent3dd3ebe5bb3837aeac28a23f8f22b97cb84abab6 (diff)
downloadlinux-227942809b52f23cda414858b635c0285f11de00.tar.bz2
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>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/powernv-cpufreq.c31
1 files changed, 29 insertions, 2 deletions
diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 90b42938837e..546e056e416d 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -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;