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cpufreq: amd-pstate: Add AMD P-State frequencies attributes

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Introduce sysfs attributes to get the different level processor
frequencies.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Huang Rui 2021-12-24 09:05:05 +08:00 committed by Rafael J. Wysocki
parent 41271016df
commit ec4e3326a9
1 changed files with 47 additions and 0 deletions
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47
drivers/cpufreq/amd-pstate.c
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@ -509,6 +509,52 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy)
return 0;
}
/* Sysfs attributes */
/*
* This frequency is to indicate the maximum hardware frequency.
* If boost is not active but supported, the frequency will be larger than the
* one in cpuinfo.
*/
static ssize_t show_amd_pstate_max_freq(struct cpufreq_policy *policy,
char *buf)
{
int max_freq;
struct amd_cpudata *cpudata;
cpudata = policy->driver_data;
max_freq = amd_get_max_freq(cpudata);
if (max_freq < 0)
return max_freq;
return sprintf(&buf[0], "%u\n", max_freq);
}
static ssize_t show_amd_pstate_lowest_nonlinear_freq(struct cpufreq_policy *policy,
char *buf)
{
int freq;
struct amd_cpudata *cpudata;
cpudata = policy->driver_data;
freq = amd_get_lowest_nonlinear_freq(cpudata);
if (freq < 0)
return freq;
return sprintf(&buf[0], "%u\n", freq);
}
cpufreq_freq_attr_ro(amd_pstate_max_freq);
cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
static struct freq_attr *amd_pstate_attr[] = {
&amd_pstate_max_freq,
&amd_pstate_lowest_nonlinear_freq,
NULL,
};
static struct cpufreq_driver amd_pstate_driver = {
.flags = CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS,
.verify = amd_pstate_verify,
@ -517,6 +563,7 @@ static struct cpufreq_driver amd_pstate_driver = {
.exit = amd_pstate_cpu_exit,
.set_boost = amd_pstate_set_boost,
.name = "amd-pstate",
.attr = amd_pstate_attr,
};
static int __init amd_pstate_init(void)