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Message-ID: <20221110175847.3098728-9-Perry.Yuan@amd.com>
Date: Fri, 11 Nov 2022 01:58:46 +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>,
Perry Yuan <Perry.Yuan@....com>
Subject: [PATCH v4 8/9] cpufreq: amd_pstate: add driver working mode status sysfs entry
While amd-pstate driver was loaded with specific driver mode, it will
need to check which mode is enabled for the pstate driver,add this sysfs
entry to show the current status
$ cat /sys/devices/system/cpu/amd-pstate/status
active
Signed-off-by: Perry Yuan <Perry.Yuan@....com>
---
drivers/cpufreq/amd-pstate.c | 44 ++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index b71bfbbb7639..6a3b610cb084 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -65,6 +65,8 @@ static int cppc_load __initdata;
static int epp_off __initdata;
static struct cpufreq_driver *default_pstate_driver;
+static struct cpufreq_driver amd_pstate_epp_driver;
+static struct cpufreq_driver amd_pstate_driver;
static struct amd_cpudata **all_cpu_data;
static struct amd_pstate_params global_params;
@@ -798,6 +800,46 @@ static ssize_t store_boost(struct kobject *a,
return count;
}
+static ssize_t amd_pstate_show_status(char *buf)
+{
+ if (!default_pstate_driver)
+ return sprintf(buf, "off\n");
+
+ return sprintf(buf, "%s\n", default_pstate_driver == &amd_pstate_epp_driver ?
+ "active" : "passive");
+}
+
+static int amd_pstate_update_status(const char *buf, size_t size)
+{
+ /* FIXME! */
+ return -EOPNOTSUPP;
+}
+
+static ssize_t show_status(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ ssize_t ret;
+
+ mutex_lock(&amd_pstate_driver_lock);
+ ret = amd_pstate_show_status(buf);
+ mutex_unlock(&amd_pstate_driver_lock);
+
+ return ret;
+}
+
+static ssize_t store_status(struct kobject *a, struct kobj_attribute *b,
+ const char *buf, size_t count)
+{
+ char *p = memchr(buf, '\n', count);
+ int ret;
+
+ mutex_lock(&amd_pstate_driver_lock);
+ ret = amd_pstate_update_status(buf, p ? p - buf : count);
+ mutex_unlock(&amd_pstate_driver_lock);
+
+ return ret < 0 ? ret : count;
+}
+
cpufreq_freq_attr_ro(amd_pstate_max_freq);
cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
@@ -805,6 +847,7 @@ 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(boost);
+define_one_global_rw(status);
static struct freq_attr *amd_pstate_attr[] = {
&amd_pstate_max_freq,
@@ -824,6 +867,7 @@ static struct freq_attr *amd_pstate_epp_attr[] = {
static struct attribute *pstate_global_attributes[] = {
&boost.attr,
+ &status.attr,
NULL
};
--
2.34.1
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