cpufreq: intel_pstate: New sysfs entry to control HWP boost

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>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 5b2b6b6d1ff4..70bf63bb4e0e 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1033,6 +1033,30 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
         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);
 
@@ -1042,6 +1066,7 @@ 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,
@@ -1082,6 +1107,11 @@ static void __init intel_pstate_sysfs_expose_params(void)
         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 ************************/