From 34cfca722c1a36ae04b9fb6e50930fef30f75518 Mon Sep 17 00:00:00 2001
From: Thomas Richter <tmricht@linux.ibm.com>
Date: Tue, 21 Jul 2020 14:29:58 +0200
Subject: [PATCH] cpumf/lscpumf.c: Add support for counter number 265
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Set the counter name for z15 counter numbered 265. It is either named
DFLT_CCERROR or DFLT_CCFINISH, depending on the linux version. The
counter was renamed from CCERROR to CCFINISH in linux version 5.8.
Check for existence of file /sys/devices/cpum_cf/events/DLFT_CCERROR.
f this file exists the counter is named DFLT_CCERROR else
DFLT_CCFINISH (only for z15), other machines do not have this counter.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
---
 cpumf/lscpumf.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/cpumf/lscpumf.c b/cpumf/lscpumf.c
index 21e9d466..88146c7f 100644
--- a/cpumf/lscpumf.c
+++ b/cpumf/lscpumf.c
@@ -2539,7 +2539,7 @@ static struct counters cpumcf_z15_counters[] = {
 	{
 		.ctrnum = 265,
 		.ctrset = CPUMF_CTRSET_EXTENDED,
-		.name = "DFLT_CCERROR",
+		.name = NULL,
 		.desc = "Increments by one for every DEFLATE CONVERSION CALL"
 			"\n\t\tinstruction executed that ended in Condition Codes"
 			"\n\t\t0, 1 or 2",
@@ -2830,6 +2830,30 @@ static int read_sfb(struct cpumf_info *p)
 	return rc;
 }
 
+/* Set the counter name for z15 counter numbered 265. It is either named
+ * DFLT_CCERROR or DFLT_CCFINISH, depending on the linux version. The
+ * counter was renamed from CCERROR to CCFINISH in linux version 5.8.
+ * Check for existence of file /sys/devices/cpum_cf/events/DLFT_CCERROR.
+ */
+#define	CCERROR		"/sys/devices/cpum_cf/events/DFLT_CCERROR"
+static void read_ccerror(struct counters *cp, size_t cp_cnt)
+{
+	struct stat sbuf;
+	char *ctrname;
+	size_t i = 0;
+
+	if (stat(CCERROR, &sbuf) == 0)
+		ctrname = "DFLT_CCERROR";
+	else
+		ctrname = "DFLT_CCFINISH";
+	/* Find DFLT_CC{FINISH,ERROR} in table and set name */
+	for (struct counters *p = cp; i < cp_cnt; ++i, ++p)
+		if (p->ctrnum == 265) {
+			p->name = ctrname;
+			break;
+		}
+}
+
 /* Read allnecessary information from /sysfs file /proc/service_levels */
 static int read_info(void)
 {
@@ -3017,6 +3041,7 @@ static struct counters *get_counter(int ctrset, size_t *len)
 		case 8562:
 			cp = cpumcf_z15_counters;
 			*len = ARRAY_SIZE(cpumcf_z15_counters);
+			read_ccerror(cp, *len);
 			break;
 		}
 		break;