linux-kernel - [PATCH v2 6/6] cpufreq/cppc: set the frequency used for capacity computation

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Message-Id: <20231009103621.374412-7-vincent.guittot@linaro.org>
Date:   Mon,  9 Oct 2023 12:36:21 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     linux@...linux.org.uk, catalin.marinas@....com, will@...nel.org,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, sudeep.holla@....com,
        gregkh@...uxfoundation.org, rafael@...nel.org, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        viresh.kumar@...aro.org, lukasz.luba@....com,
        ionela.voinescu@....com, pierre.gondois@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-pm@...r.kernel.org
Cc:     conor.dooley@...rochip.com, suagrfillet@...il.com,
        ajones@...tanamicro.com, lftan@...nel.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH v2 6/6] cpufreq/cppc: set the frequency used for capacity computation

cppc cpufreq driver can register an artificial energy model. In such case,
it also have to register the frequency that is used to define the CPU
capacity

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
---
 drivers/cpufreq/cppc_cpufreq.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index fe08ca419b3d..24c6ba349f01 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -636,6 +636,21 @@ static int populate_efficiency_class(void)
 	return 0;
 }
 
+
+static void cppc_cpufreq_set_capacity_ref_freq(struct cpufreq_policy *policy)
+{
+	struct cppc_perf_caps *perf_caps;
+	struct cppc_cpudata *cpu_data;
+	unsigned int ref_freq;
+
+	cpu_data = policy->driver_data;
+	perf_caps = &cpu_data->perf_caps;
+
+	ref_freq = cppc_cpufreq_perf_to_khz(cpu_data, perf_caps->highest_perf);
+
+	per_cpu(capacity_ref_freq, policy->cpu) = ref_freq;
+}
+
 static void cppc_cpufreq_register_em(struct cpufreq_policy *policy)
 {
 	struct cppc_cpudata *cpu_data;
@@ -643,6 +658,9 @@ static void cppc_cpufreq_register_em(struct cpufreq_policy *policy)
 		EM_ADV_DATA_CB(cppc_get_cpu_power, cppc_get_cpu_cost);
 
 	cpu_data = policy->driver_data;
+
+	cppc_cpufreq_set_capacity_ref_freq(policy);
+
 	em_dev_register_perf_domain(get_cpu_device(policy->cpu),
 			get_perf_level_count(policy), &em_cb,
 			cpu_data->shared_cpu_map, 0);
-- 
2.34.1