1 files changed, 37 insertions, 0 deletions

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 438bb261f391..22a4ad5a927a 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -3,6 +3,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <stdbool.h>
+#include <stdarg.h>
 #include <dirent.h>
 #include <api/fs/fs.h>
 #include <locale.h>
@@ -804,3 +805,39 @@ bool pmu_have_event(const char *pname, const char *name)
         }
         return false;
 }
+
+static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
+{
+        struct stat st;
+        char path[PATH_MAX];
+        const char *sysfs;
+
+        sysfs = sysfs__mountpoint();
+        if (!sysfs)
+                return NULL;
+
+        snprintf(path, PATH_MAX,
+                 "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
+
+        if (stat(path, &st) < 0)
+                return NULL;
+
+        return fopen(path, "r");
+}
+
+int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
+                        ...)
+{
+        va_list args;
+        FILE *file;
+        int ret = EOF;
+
+        va_start(args, fmt);
+        file = perf_pmu__open_file(pmu, name);
+        if (file) {
+                ret = vfscanf(file, fmt, args);
+                fclose(file);
+        }
+        va_end(args);
+        return ret;
+}