linux-kernel - [PATCH v2 1/3] cpufreq: CPPC: Add cppc_cpufreq_search_cpu

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Message-Id: <20220407081620.1662192-2-pierre.gondois@arm.com>
Date:   Thu,  7 Apr 2022 10:16:16 +0200
From:   Pierre Gondois <pierre.gondois@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Ionela.Voinescu@....com, Lukasz.Luba@....com,
        Morten.Rasmussen@....com, Dietmar.Eggemann@....com, maz@...nel.org,
        Pierre Gondois <Pierre.Gondois@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Fuad Tabba <tabba@...gle.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Rob Herring <robh@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org
Subject: [PATCH v2 1/3] cpufreq: CPPC: Add cppc_cpufreq_search_cpu_data

From: Pierre Gondois <Pierre.Gondois@....com>

cppc_cpufreq_get_cpu_data() allocates a new struct cppc_cpudata
for the input CPU at each call.

To search the struct associated with a cpu without allocating
a new one, add cppc_cpufreq_search_cpu_data().
Also add an early prototype.

This will be used in a later patch, when generating artificial
performance states to register an artificial Energy Model in the
cppc_cpufreq driver and enable the Energy Aware Scheduler for ACPI
based systems.

Signed-off-by: Pierre Gondois <Pierre.Gondois@....com>
---
 drivers/cpufreq/cppc_cpufreq.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index 82d370ae6a4a..ffcd9704add2 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -41,6 +41,8 @@
  */
 static LIST_HEAD(cpu_data_list);
 
+static struct cppc_cpudata *cppc_cpufreq_search_cpu_data(unsigned int cpu);
+
 static bool boost_supported;
 
 struct cppc_workaround_oem_info {
@@ -479,6 +481,19 @@ static void cppc_cpufreq_put_cpu_data(struct cpufreq_policy *policy)
 	policy->driver_data = NULL;
 }
 
+static struct cppc_cpudata *
+cppc_cpufreq_search_cpu_data(unsigned int cpu)
+{
+	struct cppc_cpudata *iter, *tmp;
+
+	list_for_each_entry_safe(iter, tmp, &cpu_data_list, node) {
+		if (cpumask_test_cpu(cpu, iter->shared_cpu_map))
+			return iter;
+	}
+
+	return NULL;
+}
+
 static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
 {
 	unsigned int cpu = policy->cpu;
-- 
2.25.1