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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>
hifive-unleashed-5.1
Srinivas Pandruvada 2018-06-05 14:42:41 -07:00 committed by Rafael J. Wysocki
parent 52ccc43142
commit aaaece3de9
1 changed files with 30 additions and 0 deletions
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30
drivers/cpufreq/intel_pstate.c
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@ -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 ************************/