linux-kernel - [PATCH v14 2/3] cpufreq: Add of_perf_domain_get_sharing

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Date:   Sat, 28 Aug 2021 23:01:11 +0800
From:   Hector Yuan <hector.yuan@...iatek.com>
To:     <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <wsd_upstream@...iatek.com>,
        <hector.yuan@...iatek.com>
Subject: [PATCH v14 2/3] cpufreq: Add of_perf_domain_get_sharing_cpumask

From: "Hector.Yuan" <hector.yuan@...iatek.com>

Add of_perf_domain_get_sharing_cpumask function to group cpu
to specific performance domain.

Signed-off-by: Hector.Yuan <hector.yuan@...iatek.com>
---
 include/linux/cpufreq.h |   39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 9fd7194..4916d70 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -13,6 +13,8 @@
 #include <linux/completion.h>
 #include <linux/kobject.h>
 #include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/pm_qos.h>
 #include <linux/spinlock.h>
 #include <linux/sysfs.h>
@@ -1036,6 +1038,43 @@ void arch_set_freq_scale(const struct cpumask *cpus,
 }
 #endif
 
+#ifdef CONFIG_CPU_FREQ
+static inline int of_perf_domain_get_sharing_cpumask(int index, const char *list_name,
+						     const char *cell_name,
+						     struct cpumask *cpumask)
+{
+	struct device_node *cpu_np;
+	struct of_phandle_args args;
+	int cpu, ret;
+
+	for_each_possible_cpu(cpu) {
+		cpu_np = of_cpu_device_node_get(cpu);
+		if (!cpu_np)
+			continue;
+
+		ret = of_parse_phandle_with_args(cpu_np, list_name,
+						 cell_name, 0,
+						 &args);
+
+		of_node_put(cpu_np);
+		if (ret < 0)
+			continue;
+
+		if (index == args.args[0])
+			cpumask_set_cpu(cpu, cpumask);
+	}
+
+	return 0;
+}
+#else
+static inline int of_perf_domain_get_sharing_cpumask(int index, const char *list_name,
+						     const char *cell_name,
+						     struct cpumask *cpumask)
+{
+	return 0;
+}
+#endif
+
 /* the following are really really optional */
 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
-- 
1.7.9.5