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authorShilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>2015-09-14 14:01:47 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-09-26 03:03:06 +0200
commitd43b1b6f8e5b3219d4d02ea7fadcf67fecf78b1a (patch)
treedc6d5fe08aeb72fe6ce8ae78f9d95d6df430c33b /drivers/cpufreq
parenta35fc5a33b62a6c658b8ffe7544c966c1776d128 (diff)
downloadlwn-d43b1b6f8e5b3219d4d02ea7fadcf67fecf78b1a.tar.gz
lwn-d43b1b6f8e5b3219d4d02ea7fadcf67fecf78b1a.zip
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>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/powernv-cpufreq.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 64994e10638e..cb501386eb6e 100644
--- 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,