1 files changed, 29 insertions, 4 deletions

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 3bf7b145b826..c7115d369511 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -482,6 +482,34 @@ static void fs_something(void)
         }
 }
 
+static const char *do_determine_event(bool excl_kernel)
+{
+        const char *event = excl_kernel ? "cycles:u" : "cycles";
+
+#ifdef __s390x__
+        char cpuid[128], model[16], model_c[16], cpum_cf_v[16];
+        unsigned int family;
+        int ret, cpum_cf_a;
+
+        if (get_cpuid(cpuid, sizeof(cpuid)))
+                goto out_clocks;
+        ret = sscanf(cpuid, "%*[^,],%u,%[^,],%[^,],%[^,],%x", &family, model_c,
+                     model, cpum_cf_v, &cpum_cf_a);
+        if (ret != 5)            /* Not available */
+                goto out_clocks;
+        if (excl_kernel && (cpum_cf_a & 4))
+                return event;
+        if (!excl_kernel && (cpum_cf_a & 2))
+                return event;
+
+        /* Fall through: missing authorization */
+out_clocks:
+        event = excl_kernel ? "cpu-clock:u" : "cpu-clock";
+
+#endif
+        return event;
+}
+
 static void do_something(void)
 {
         fs_something();
@@ -592,10 +620,7 @@ static int do_test_code_reading(bool try_kcore)
 
                 perf_evlist__set_maps(evlist, cpus, threads);
 
-                if (excl_kernel)
-                        str = "cycles:u";
-                else
-                        str = "cycles";
+                str = do_determine_event(excl_kernel);
                 pr_debug("Parsing event '%s'\n", str);
                 ret = parse_events(evlist, str, NULL);
                 if (ret < 0) {