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.voine...@arm.com>
Acked-by: Viresh Kumar <viresh.ku...@linaro.org>
Cc: Rafael J. Wysocki <r...@rjwysocki.net>
Cc: Viresh Kumar <viresh.ku...@linaro.org>
---
Documentation/ABI/testing/sysfs-devices-system-cpu | 3 ++-
drivers/cpufreq/cppc_cpufreq.c | 14 ++++++++++++++
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu
b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 1a04ca8162ad..0eee30b27ab6 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -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}
diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index f15a44c8b6b7..40b58d2dbbc6 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -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",
};
--
2.29.2.dirty
