Messages in this thread Patch in this message | | | From | Perry Yuan <> | Subject | [PATCH v4 8/9] cpufreq: amd_pstate: add driver working mode status sysfs entry | Date | Fri, 11 Nov 2022 01:58:46 +0800 |
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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@amd.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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