From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date: Tue, 5 Jun 2018 14:42:41 -0700
Subject: cpufreq: intel_pstate: New sysfs entry to control HWP boost
Patch-mainline: v4.18-rc1
Git-commit: aaaece3de9d7709d79004dd5d5aa7c9b366f0675
References: bsc#1066110

A new attribute is added to intel_pstate sysfs to enable/disable
HWP dynamic performance boost.

Reported-by: Mel Gorman <mgorman@techsingularity.net>
Tested-by: Giovanni Gherdovich <ggherdovich@suse.cz>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Giovanni Gherdovich <ggherdovich@suse.cz>
---
 drivers/cpufreq/intel_pstate.c |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1218,6 +1218,30 @@ static ssize_t store_min_perf_pct(struct
 	return count;
 }
 
+static ssize_t show_hwp_dynamic_boost(struct kobject *kobj,
+				struct attribute *attr, char *buf)
+{
+	return sprintf(buf, "%u\n", hwp_boost);
+}
+
+static ssize_t store_hwp_dynamic_boost(struct kobject *a, struct attribute *b,
+				       const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+
+	ret = kstrtouint(buf, 10, &input);
+	if (ret)
+		return ret;
+
+	mutex_lock(&intel_pstate_driver_lock);
+	hwp_boost = !!input;
+	intel_pstate_update_policies();
+	mutex_unlock(&intel_pstate_driver_lock);
+
+	return count;
+}
+
 show_one(max_perf_pct, max_perf_pct);
 show_one(min_perf_pct, min_perf_pct);
 
@@ -1227,6 +1251,7 @@ define_one_global_rw(max_perf_pct);
 define_one_global_rw(min_perf_pct);
 define_one_global_ro(turbo_pct);
 define_one_global_ro(num_pstates);
+define_one_global_rw(hwp_dynamic_boost);
 
 static struct attribute *intel_pstate_attributes[] = {
 	&status.attr,
@@ -1267,6 +1292,11 @@ static void __init intel_pstate_sysfs_ex
 	rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr);
 	WARN_ON(rc);
 
+	if (hwp_active) {
+		rc = sysfs_create_file(intel_pstate_kobject,
+				       &hwp_dynamic_boost.attr);
+		WARN_ON(rc);
+	}
 }
 /************************** sysfs end ************************/