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 <[email protected]>
---
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
On 11/10/2022 11:58, Perry Yuan wrote:
> 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 <[email protected]>
> ---
> 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");
> +}
For new code I believe you should use the new helper sysfs_emit() instead.
> +
> +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
> };
>
[AMD Official Use Only - General]
> -----Original Message-----
> From: Limonciello, Mario <[email protected]>
> Sent: Tuesday, November 15, 2022 6:30 AM
> To: Yuan, Perry <[email protected]>; [email protected]; Huang,
> Ray <[email protected]>; [email protected]
> Cc: Sharma, Deepak <[email protected]>; Fontenot, Nathan
> <[email protected]>; Deucher, Alexander
> <[email protected]>; Huang, Shimmer
> <[email protected]>; Du, Xiaojian <[email protected]>; Meng,
> Li (Jassmine) <[email protected]>; Karny, Wyes <[email protected]>;
> [email protected]; [email protected]
> Subject: Re: [PATCH v4 8/9] cpufreq: amd_pstate: add driver working mode
> status sysfs entry
>
> On 11/10/2022 11:58, Perry Yuan wrote:
> > 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 <[email protected]>
> > ---
> > 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");
> > +}
>
> For new code I believe you should use the new helper sysfs_emit() instead.
Make sense, changed in v5.
Thanks .
Perry.
>
> > +
> > +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
> > };
> >