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-rw-r--r--kernel/power/energy_model.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index c1ff7fa030ab..efe2a595988e 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -52,6 +52,17 @@ static int em_debug_cpus_show(struct seq_file *s, void *unused)
}
DEFINE_SHOW_ATTRIBUTE(em_debug_cpus);
+static int em_debug_units_show(struct seq_file *s, void *unused)
+{
+ struct em_perf_domain *pd = s->private;
+ char *units = pd->milliwatts ? "milliWatts" : "bogoWatts";
+
+ seq_printf(s, "%s\n", units);
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(em_debug_units);
+
static void em_debug_create_pd(struct device *dev)
{
struct dentry *d;
@@ -64,6 +75,8 @@ static void em_debug_create_pd(struct device *dev)
debugfs_create_file("cpus", 0444, d, dev->em_pd->cpus,
&em_debug_cpus_fops);
+ debugfs_create_file("units", 0444, d, dev->em_pd, &em_debug_units_fops);
+
/* Create a sub-directory for each performance state */
for (i = 0; i < dev->em_pd->nr_perf_states; i++)
em_debug_create_ps(&dev->em_pd->table[i], d);
@@ -250,17 +263,24 @@ EXPORT_SYMBOL_GPL(em_cpu_get);
* @cpus : Pointer to cpumask_t, which in case of a CPU device is
* obligatory. It can be taken from i.e. 'policy->cpus'. For other
* type of devices this should be set to NULL.
+ * @milliwatts : Flag indicating that the power values are in milliWatts or
+ * in some other scale. It must be set properly.
*
* Create Energy Model tables for a performance domain using the callbacks
* defined in cb.
*
+ * The @milliwatts is important to set with correct value. Some kernel
+ * sub-systems might rely on this flag and check if all devices in the EM are
+ * using the same scale.
+ *
* If multiple clients register the same performance domain, all but the first
* registration will be ignored.
*
* Return 0 on success
*/
int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
- struct em_data_callback *cb, cpumask_t *cpus)
+ struct em_data_callback *cb, cpumask_t *cpus,
+ bool milliwatts)
{
unsigned long cap, prev_cap = 0;
int cpu, ret;
@@ -313,6 +333,8 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
if (ret)
goto unlock;
+ dev->em_pd->milliwatts = milliwatts;
+
em_debug_create_pd(dev);
dev_info(dev, "EM: created perf domain\n");