linux-kernel - [PATCH 2/2] cpufreq: scmi: Update Energy Model with allowed performance limits

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Date: Wed,  3 Apr 2024 17:23:15 +0100
From: Lukasz Luba <lukasz.luba@....com>
To: linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Cc: lukasz.luba@....com,
	dietmar.eggemann@....com,
	linux-arm-kernel@...ts.infradead.org,
	sudeep.holla@....com,
	cristian.marussi@....com,
	linux-samsung-soc@...r.kernel.org,
	rafael@...nel.org,
	viresh.kumar@...aro.org,
	quic_sibis@...cinc.com
Subject: [PATCH 2/2] cpufreq: scmi: Update Energy Model with allowed performance limits

The Energy Model (EM) supports performance limits updates. Use the SCMI
notifications to get information from FW about allowed frequency scope for
the CPUs.

Signed-off-by: Lukasz Luba <lukasz.luba@....com>
---
 drivers/cpufreq/scmi-cpufreq.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index d946b7a082584..90c8448578cb1 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -185,12 +185,25 @@ static int scmi_limit_notify_cb(struct notifier_block *nb, unsigned long event,
 {
 	struct scmi_data *priv = container_of(nb, struct scmi_data, limit_notify_nb);
 	struct scmi_perf_limits_report *limit_notify = data;
+	unsigned int limit_freq_max_khz, limit_freq_min_khz;
 	struct cpufreq_policy *policy = priv->policy;
-	unsigned int limit_freq_khz;
+	struct em_perf_domain *pd;
+	int ret;
+
+	limit_freq_max_khz = limit_notify->range_max_freq / HZ_PER_KHZ;
+	limit_freq_min_khz = limit_notify->range_min_freq / HZ_PER_KHZ;
 
-	limit_freq_khz = limit_notify->range_max_freq / HZ_PER_KHZ;
+	pd = em_cpu_get(policy->cpu);
+	if (pd) {
+		ret = em_update_performance_limits(pd, limit_freq_min_khz,
+						   limit_freq_max_khz);
+		if (ret)
+			dev_warn(priv->cpu_dev,
+				 "EM perf limits update failed\n");
+	}
 
-	policy->max = clamp(limit_freq_khz, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
+	policy->max = clamp(limit_freq_max_khz, policy->cpuinfo.min_freq,
+			    policy->cpuinfo.max_freq);
 
 	cpufreq_update_pressure(policy);
 
-- 
2.25.1