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Subject[RFC PATCH 2/7] sched/cpufreq: Attach perf domain to sugov policy
Date
From: Douglas RAILLARD <douglas.raillard@arm.com>

Attach an Energy Model perf_domain to each sugov_policy to prepare the
ground for energy-aware schedutil.

Signed-off-by: Douglas RAILLARD <douglas.raillard@arm.com>
---
kernel/sched/cpufreq_schedutil.c | 39 ++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)

diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index d0f4d2111bfe..82dbacf83649 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -39,6 +39,10 @@ struct sugov_policy {
bool work_in_progress;

bool need_freq_update;
+
+#ifdef CONFIG_ENERGY_MODEL
+ struct em_perf_domain *pd;
+#endif
};

struct sugov_cpu {
@@ -64,6 +68,38 @@ static DEFINE_PER_CPU(struct sugov_cpu, sugov_cpu);

/************************ Governor internals ***********************/

+#ifdef CONFIG_ENERGY_MODEL
+static void sugov_policy_attach_pd(struct sugov_policy *sg_policy)
+{
+ struct em_perf_domain *pd;
+ struct cpufreq_policy *policy = sg_policy->policy;
+
+ sg_policy->pd = NULL;
+ pd = em_cpu_get(policy->cpu);
+ if (!pd)
+ return;
+
+ if (cpumask_equal(policy->related_cpus, to_cpumask(pd->cpus)))
+ sg_policy->pd = pd;
+ else
+ pr_warn("%s: Not all CPUs in schedutil policy %u share the same perf domain, no perf domain for that policy will be registered\n",
+ __func__, policy->cpu);
+}
+
+static struct em_perf_domain *sugov_policy_get_pd(
+ struct sugov_policy *sg_policy)
+{
+ return sg_policy->pd;
+}
+#else /* CONFIG_ENERGY_MODEL */
+static void sugov_policy_attach_pd(struct sugov_policy *sg_policy) {}
+static struct em_perf_domain *sugov_policy_get_pd(
+ struct sugov_policy *sg_policy)
+{
+ return NULL;
+}
+#endif /* CONFIG_ENERGY_MODEL */
+
static bool sugov_should_update_freq(struct sugov_policy *sg_policy, u64 time)
{
s64 delta_ns;
@@ -849,6 +885,9 @@ static int sugov_start(struct cpufreq_policy *policy)
sugov_update_shared :
sugov_update_single);
}
+
+ sugov_policy_attach_pd(sg_policy);
+
return 0;
}

--
2.21.0
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