From e8f0f534bab72cecdaf6b5822324d71884cb9133 Mon Sep 17 00:00:00 2001
Message-Id: <e8f0f534bab72cecdaf6b5822324d71884cb9133.1587532692.git.kamalesh@linux.vnet.ibm.com>
In-Reply-To: <cover.1587532692.git.kamalesh@linux.vnet.ibm.com>
References: <cover.1587532692.git.kamalesh@linux.vnet.ibm.com>
From: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Date: Tue, 21 Apr 2020 07:55:28 -0500
Subject: [PATCH V4 04/14] lparstat: Capture nominal frequency
To: powerpc-utils-devel@googlegroups.com
Cc: Tyrel Datwyler <tyreld@linux.ibm.com>,
    Nathan Lynch <nathanl@linux.ibm.com>,
    Naveen N . Rao <naveen.n.rao@linux.vnet.ibm.com>,
    Gautham R . Shenoy <ego@linux.vnet.ibm.com>,
    Vasant Hegde <hegdevasant@linux.vnet.ibm.com>

Capture the nominal frequency/clock from the /proc/cpuinfo. This value
will be used later to calculate the effective/current frequency at which
the processor is running.

Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
---
 src/lparstat.c | 36 ++++++++++++++++++++++++++++++++++++
 src/lparstat.h |  2 ++
 2 files changed, 38 insertions(+)

diff --git a/src/lparstat.c b/src/lparstat.c
index 1d0b3a7..24c48ad 100644
--- a/src/lparstat.c
+++ b/src/lparstat.c
@@ -171,6 +171,38 @@ void get_sys_uptime(struct sysentry *unused_se, char *uptime)
 	fclose(f);
 }
 
+int get_nominal_frequency(void)
+{
+	FILE *f;
+	char buf[80];
+	struct sysentry *se;
+	char *nfreq = NULL;
+
+	f = fopen("/proc/cpuinfo", "r");
+	if (!f) {
+		fprintf(stderr, "Could not open /proc/cpuinfo\n");
+		return -1;
+	}
+
+	while ((fgets(buf, 80, f)) != NULL) {
+		if (!strncmp(buf, "clock", 5)) {
+			nfreq = strchr(buf, ':') + 2;
+			break;
+		}
+	}
+
+	fclose(f);
+
+	if (!nfreq) {
+		fprintf(stderr, "Failed to read Nominal frequency\n");
+		return -1;
+	}
+
+	se = get_sysentry("nominal_freq");
+	snprintf(se->value, sizeof(se->value), "%s", nfreq);
+
+	return 0;
+}
 
 void get_cpu_physc(struct sysentry *unused_se, char *buf)
 {
@@ -623,6 +655,10 @@ void init_sysinfo(void)
 	}
 
 	get_online_cores();
+
+	rc = get_nominal_frequency();
+	if (rc)
+		exit(rc);
 }
 
 void init_sysdata(void)
diff --git a/src/lparstat.h b/src/lparstat.h
index 6b65b48..c1bac28 100644
--- a/src/lparstat.h
+++ b/src/lparstat.h
@@ -242,6 +242,8 @@ struct sysentry system_data[] = {
 	/* /proc/cpuinfo */
 	{.name = "timebase",
 	 .descr = "Timebase"},
+	{.name = "nominal_freq",
+	 .descr = "Nominal Frequency"},
 
 	/* /proc/interrupts */
 	{.name = "phint",
-- 
2.25.3