cpufreq : powernv: Report Pmax throttling if capped below nominal frequency

Log a 'critical' message if the max frequency is reduced below nominal
frequency. We already log 'info' message if the max frequency is
capped below turbo frequency. CPU should guarantee atleast nominal
frequency, but not turbo frequency in all system configurations and
environments. So report the pmax throttling with severity when Pmax is
dipped below nominal frequency.

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>

diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 64994e10638e4595c98248a5671a4201523c77be..cb501386eb6ef6beee5f91b6cd54840d31b38611 100644 (file)
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -327,8 +327,14 @@ static void powernv_cpufreq_throttle_check(void *data)
                if (chips[i].throttled)
                        goto next;
                chips[i].throttled = true;
-               pr_info("CPU %d on Chip %u has Pmax reduced to %d\n", cpu,
-                       chips[i].id, pmsr_pmax);
+               if (pmsr_pmax < powernv_pstate_info.nominal)
+                       pr_crit("CPU %d on Chip %u has Pmax reduced below nominal frequency (%d < %d)\n",
+                               cpu, chips[i].id, pmsr_pmax,
+                               powernv_pstate_info.nominal);
+               else
+                       pr_info("CPU %d on Chip %u has Pmax reduced below turbo frequency (%d < %d)\n",
+                               cpu, chips[i].id, pmsr_pmax,
+                               powernv_pstate_info.max);
        } else if (chips[i].throttled) {
                chips[i].throttled = false;
                pr_info("CPU %d on Chip %u has Pmax restored to %d\n", cpu,