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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2018-06-06 00:42:41 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-06-06 09:37:52 +0300
commitaaaece3de9d7709d79004dd5d5aa7c9b366f0675 (patch)
treefefb9446852b3afdafba4a83bac0b21e174f9385 /drivers/cpufreq
parent52ccc4314293272397b117f3cc6f0f368c81431c (diff)
downloadlinux-aaaece3de9d7709d79004dd5d5aa7c9b366f0675.tar.xz
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>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/intel_pstate.c30
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 ************************/