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Message-ID: <20221208111852.386731-9-perry.yuan@amd.com>
Date: Thu, 8 Dec 2022 19:18:47 +0800
From: Perry Yuan <perry.yuan@....com>
To: <rafael.j.wysocki@...el.com>, <Mario.Limonciello@....com>,
<ray.huang@....com>, <viresh.kumar@...aro.org>
CC: <Deepak.Sharma@....com>, <Nathan.Fontenot@....com>,
<Alexander.Deucher@....com>, <Shimmer.Huang@....com>,
<Xiaojian.Du@....com>, <Li.Meng@....com>, <wyes.karny@....com>,
<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v7 08/13] cpufreq: amd-pstate: add frequency dynamic boost sysfs control
From: Perry Yuan <Perry.Yuan@....com>
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@....com>
---
drivers/cpufreq/amd-pstate.c | 67 ++++++++++++++++++++++++++++++++++--
1 file changed, 65 insertions(+), 2 deletions(-)
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index ea9255bdc9ac..4cd53c010215 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -69,6 +69,7 @@ static struct amd_pstate_params global_params;
static DEFINE_MUTEX(amd_pstate_limits_lock);
static DEFINE_MUTEX(amd_pstate_driver_lock);
+struct kobject *amd_pstate_kobj;
static bool cppc_boost __read_mostly;
@@ -768,12 +769,46 @@ static ssize_t show_energy_performance_preference(
return sysfs_emit(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_cppc_dynamic_boost(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "%u\n", cppc_boost);
+}
+
+static ssize_t store_cppc_dynamic_boost(struct kobject *a,
+ struct kobj_attribute *b,
+ const char *buf, size_t count)
+{
+ bool new_state;
+ int ret;
+
+ ret = kstrtobool(buf, &new_state);
+ if (ret)
+ return -EINVAL;
+
+ mutex_lock(&amd_pstate_driver_lock);
+ cppc_boost = !!new_state;
+ 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(cppc_dynamic_boost);
static struct freq_attr *amd_pstate_attr[] = {
&amd_pstate_max_freq,
@@ -791,6 +826,15 @@ static struct freq_attr *amd_pstate_epp_attr[] = {
NULL,
};
+static struct attribute *pstate_global_attributes[] = {
+ &cppc_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;
@@ -1404,9 +1448,28 @@ static int __init amd_pstate_init(void)
ret = cpufreq_register_driver(default_pstate_driver);
if (ret)
- pr_err("failed to register amd pstate driver with return %d\n",
- ret);
+ pr_err("failed to register driver with return %d\n", ret);
+
+ amd_pstate_kobj = kobject_create_and_add("amd-pstate", &cpu_subsys.dev_root->kobj);
+ if (!amd_pstate_kobj) {
+ ret = -EINVAL;
+ pr_err("global sysfs registration failed.\n");
+ goto kobject_free;
+ }
+
+ ret = sysfs_create_group(amd_pstate_kobj, &amd_pstate_global_attr_group);
+ if (ret) {
+ pr_err("sysfs attribute export failed with error %d.\n", ret);
+ goto global_attr_free;
+ }
+
+ return ret;
+global_attr_free:
+ kobject_put(amd_pstate_kobj);
+kobject_free:
+ cpufreq_unregister_driver(default_pstate_driver);
+ kfree(cpudata);
return ret;
}
device_initcall(amd_pstate_init);
--
2.34.1
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