cpufreq / intel_pstate: use lowest requested max performance

commit d8f469e9cff3bc4a6317d923e9506be046aa7bdc upstream.

There are two ways that the maximum p-state can be clamped, via a
policy change and via the sysfs file.

The acpi-thermal driver adjusts the p-state policy in response to
thermal events.  These changes override the users settings at the
moment.

Use the lowest of the two requested values this ensures that we will
not exceed the requested pstate from either mechanism.

Reported-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index e4786423f3f2e7ef039d746fb0d79b313c90f757..081d867449a5dc0dc949921152a5326881fd167c 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -117,6 +117,8 @@ struct perf_limits {
        int min_perf_pct;
        int32_t max_perf;
        int32_t min_perf;
+       int max_policy_pct;
+       int max_sysfs_pct;
 };
 
 static struct perf_limits limits = {
@@ -125,6 +127,8 @@ static struct perf_limits limits = {
        .max_perf = int_tofp(1),
        .min_perf_pct = 0,
        .min_perf = 0,
+       .max_policy_pct = 100,
+       .max_sysfs_pct = 100,
 };
 
 static inline void pid_reset(struct _pid *pid, int setpoint, int busy,
@@ -295,7 +299,8 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
        if (ret != 1)
                return -EINVAL;
 
-       limits.max_perf_pct = clamp_t(int, input, 0 , 100);
+       limits.max_sysfs_pct = clamp_t(int, input, 0 , 100);
+       limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
        limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
        return count;
 }
@@ -641,8 +646,9 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
        limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100);
        limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
 
-       limits.max_perf_pct = policy->max * 100 / policy->cpuinfo.max_freq;
-       limits.max_perf_pct = clamp_t(int, limits.max_perf_pct, 0 , 100);
+       limits.max_policy_pct = policy->max * 100 / policy->cpuinfo.max_freq;
+       limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100);
+       limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
        limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
 
        if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {