@@ -10,6 +10,7 @@
#define pr_fmt(fmt) "energy_model: " fmt
#include <linux/cpu.h>
+#include <linux/cpufreq.h>
#include <linux/cpumask.h>
#include <linux/debugfs.h>
#include <linux/energy_model.h>
@@ -231,6 +232,43 @@ static int em_create_pd(struct device *dev, int nr_states,
return 0;
}
+static void em_cpufreq_update_efficiencies(struct device *dev)
+{
+ struct em_perf_domain *pd = dev->em_pd;
+ struct em_perf_state *table;
+ struct cpufreq_policy *policy;
+ int found = 0;
+ int i;
+
+ if (!_is_cpu_device(dev) || !pd)
+ return;
+
+ policy = cpufreq_cpu_get(cpumask_first(em_span_cpus(pd)));
+ if (!policy) {
+ dev_warn(dev, "EM: Access to CPUFreq policy failed");
+ return;
+ }
+
+ table = pd->table;
+
+ for (i = 0; i < pd->nr_perf_states; i++) {
+ if (!(table[i].flags & EM_PERF_STATE_INEFFICIENT))
+ continue;
+
+ if (!cpufreq_table_set_inefficient(policy, table[i].frequency))
+ found++;
+ }
+
+ if (!found)
+ return;
+
+ /*
+ * Efficiencies have been installed in CPUFreq, inefficient frequencies
+ * will be skipped. The EM can do the same.
+ */
+ pd->flags |= EM_PERF_DOMAIN_SKIP_INEFFICIENCIES;
+}
+
/**
* em_pd_get() - Return the performance domain for a device
* @dev : Device to find the performance domain for
@@ -347,6 +385,8 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
if (milliwatts)
dev->em_pd->flags |= EM_PERF_DOMAIN_MILLIWATTS;
+ em_cpufreq_update_efficiencies(dev);
+
em_debug_create_pd(dev);
dev_info(dev, "EM: created perf domain\n");
The Energy Model has a 1:1 mapping between OPPs and performance states (em_perf_state). If a CPUFreq driver registers an Energy Model, inefficiencies found by the latter can be applied to CPUFreq. Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>