@@ -786,12 +786,46 @@ static ssize_t show_energy_performance_preference(
return sprintf(buf, "%s\n", energy_perf_strings[preference]);
}
+static void amd_pstate_update_policies(void)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu)
+ cpufreq_update_policy(cpu);
+}
+
+static ssize_t show_pstate_dynamic_boost(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%u\n", cppc_boost);
+}
+
+static ssize_t store_pstate_dynamic_boost(struct kobject *a,
+ struct kobj_attribute *b,
+ const char *buf, size_t count)
+{
+ unsigned int input;
+ int ret;
+
+ ret = kstrtouint(buf, 10, &input);
+ if (ret)
+ return ret;
+
+ mutex_lock(&amd_pstate_driver_lock);
+ cppc_boost = !!input;
+ amd_pstate_update_policies();
+ mutex_unlock(&amd_pstate_driver_lock);
+
+ return count;
+}
+
cpufreq_freq_attr_ro(amd_pstate_max_freq);
cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
cpufreq_freq_attr_ro(amd_pstate_highest_perf);
cpufreq_freq_attr_rw(energy_performance_preference);
cpufreq_freq_attr_ro(energy_performance_available_preferences);
+define_one_global_rw(pstate_dynamic_boost);
static struct freq_attr *amd_pstate_attr[] = {
&amd_pstate_max_freq,
@@ -809,6 +843,15 @@ static struct freq_attr *amd_pstate_epp_attr[] = {
NULL,
};
+static struct attribute *pstate_global_attributes[] = {
+ &pstate_dynamic_boost.attr,
+ NULL
+};
+
+static const struct attribute_group amd_pstate_global_attr_group = {
+ .attrs = pstate_global_attributes,
+};
+
static inline void update_boost_state(void)
{
u64 misc_en;
@@ -1416,6 +1459,16 @@ static int __init amd_pstate_init(void)
pr_err("failed to register amd pstate driver with return %d\n",
ret);
+ amd_pstate_kobj = kobject_create_and_add("amd-pstate", &cpu_subsys.dev_root->kobj);
+ if (!amd_pstate_kobj)
+ pr_err("amd-pstate: Global sysfs registration failed.\n");
+
+ ret = sysfs_create_group(amd_pstate_kobj, &amd_pstate_global_attr_group);
+ if (ret) {
+ pr_err("amd-pstate: Sysfs attribute export failed with error %d.\n",
+ ret);
+ }
+
return ret;
}
device_initcall(amd_pstate_init);
Add one sysfs entry to control the CPU cores frequency boost state The attribute file can allow user to set max performance boosted or keeping at normal perf level. Signed-off-by: Perry Yuan <Perry.Yuan@amd.com> --- drivers/cpufreq/amd-pstate.c | 53 ++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+)