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cppc_cpufreq: expose information on frequency domains

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Use the existing sysfs attribute "freqdomain_cpus" to expose
information to userspace about CPUs in the same frequency domain.

Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ionela Voinescu 2020-12-14 12:38:22 +00:00 committed by Rafael J. Wysocki
parent bf76bb208f
commit cfdc589f4b
2 changed files with 16 additions and 1 deletions
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3
Documentation/ABI/testing/sysfs-devices-system-cpu
View File

@ -264,7 +264,8 @@ Description: Discover CPUs in the same CPU frequency coordination domain
attribute is useful for user space DVFS controllers to get better
power/performance results for platforms using acpi-cpufreq.
This file is only present if the acpi-cpufreq driver is in use.
This file is only present if the acpi-cpufreq or the cppc-cpufreq
drivers are in use.
What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1}

14
drivers/cpufreq/cppc_cpufreq.c
View File

@ -402,6 +402,19 @@ static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state)
return 0;
}
static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
{
unsigned int cpu = policy->cpu;
return cpufreq_show_cpus(all_cpu_data[cpu]->shared_cpu_map, buf);
}
cpufreq_freq_attr_ro(freqdomain_cpus);
static struct freq_attr *cppc_cpufreq_attr[] = {
&freqdomain_cpus,
NULL,
};
static struct cpufreq_driver cppc_cpufreq_driver = {
.flags = CPUFREQ_CONST_LOOPS,
.verify = cppc_verify_policy,
@ -410,6 +423,7 @@ static struct cpufreq_driver cppc_cpufreq_driver = {
.init = cppc_cpufreq_cpu_init,
.stop_cpu = cppc_cpufreq_stop_cpu,
.set_boost = cppc_cpufreq_set_boost,
.attr = cppc_cpufreq_attr,
.name = "cppc_cpufreq",
};