linux-kernel - [PATCH] add cpu frequency to cpuinfo in arm64

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Date:   Wed, 26 Jan 2022 09:18:53 +0000
From:   Chao Liu <liuchao173@...wei.com>
To:     <catalin.marinas@....com>, <will@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <hewenliang4@...wei.com>,
        <zhoukang7@...wei.com>
Subject: [PATCH] add cpu frequency to cpuinfo in arm64

There is cpu frequency in /proc/cpuinfo in x86 but not in arm64

Signed-off-by: Chao Liu <liuchao173@...wei.com>
---
 arch/arm64/kernel/cpuinfo.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 591c18a889a5..a5af899bebc9 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -24,6 +24,7 @@
 #include <linux/sched.h>
 #include <linux/smp.h>
 #include <linux/delay.h>
+#include <linux/cpufreq.h>
 
 /*
  * In case the boot CPU is hotpluggable, we record its initial state and
@@ -144,6 +145,7 @@ static int c_show(struct seq_file *m, void *v)
 	for_each_online_cpu(i) {
 		struct cpuinfo_arm64 *cpuinfo = &per_cpu(cpu_data, i);
 		u32 midr = cpuinfo->reg_midr;
+		unsigned int freq = cpufreq_quick_get(i);
 
 		/*
 		 * glibc reads /proc/cpuinfo to determine the number of
@@ -159,6 +161,11 @@ static int c_show(struct seq_file *m, void *v)
 			   loops_per_jiffy / (500000UL/HZ),
 			   loops_per_jiffy / (5000UL/HZ) % 100);
 
+
+		if (cpu_freq)
+			seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
+				   freq / 1000, (freq % 1000));
+
 		/*
 		 * Dump out the common processor features in a single line.
 		 * Userspace should read the hwcaps with getauxval(AT_HWCAP)
-- 
2.23.0