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Subject[PATCH 7/8] cppc_cpufreq: expose information on frequency domains
Date
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>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@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 60ac7f8049b5..b4edeeb57d04 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -483,6 +483,19 @@ 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)
+{
+ struct cppc_cpudata *cpu_data = policy->driver_data;
+
+ return cpufreq_show_cpus(cpu_data->domain->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,
@@ -491,6 +504,7 @@ 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",
};

--
2.17.1
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