cpuidle: sysfs: Export target residency information

From user space, there is no way to know the target residency for each idle
state. If we want to write tools to measure the accuracy of the idle state
selection from the governor, we need this info.

As the exit latency is exported through sysfs, exporting the target residency
in the same place makes sense.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index e918b6d0caf7558025578be747b920003adb2698..efe2f175168f608f6170d37d516a444cab6c0676 100644 (file)
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -293,6 +293,7 @@ static ssize_t show_state_##_name(struct cpuidle_state *state, \
 }
 
 define_show_state_function(exit_latency)
+define_show_state_function(target_residency)
 define_show_state_function(power_usage)
 define_show_state_ull_function(usage)
 define_show_state_ull_function(time)
@@ -304,6 +305,7 @@ define_store_state_ull_function(disable)
 define_one_state_ro(name, show_state_name);
 define_one_state_ro(desc, show_state_desc);
 define_one_state_ro(latency, show_state_exit_latency);
+define_one_state_ro(residency, show_state_target_residency);
 define_one_state_ro(power, show_state_power_usage);
 define_one_state_ro(usage, show_state_usage);
 define_one_state_ro(time, show_state_time);
@@ -313,6 +315,7 @@ static struct attribute *cpuidle_state_default_attrs[] = {
        &attr_name.attr,
        &attr_desc.attr,
        &attr_latency.attr,
+       &attr_residency.attr,
        &attr_power.attr,
        &attr_usage.attr,
        &attr_time.attr,