perf evlist: Introduce perf_evlist__strerror_tp method

[~andy/linux] / tools / perf / util / evlist.c

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index cb9523f50a37b4587a16dadabb103fb1c4d21a08..6737420891cd00ac7a9e04c23a34be2e29aa04d5 100644 (file)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1126,3 +1126,30 @@ size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
 
        return printed + fprintf(fp, "\n");;
 }
+
+int perf_evlist__strerror_tp(struct perf_evlist *evlist __maybe_unused,
+                            int err, char *buf, size_t size)
+{
+       char sbuf[128];
+
+       switch (err) {
+       case ENOENT:
+               scnprintf(buf, size, "%s",
+                         "Error:\tUnable to find debugfs\n"
+                         "Hint:\tWas your kernel was compiled with debugfs support?\n"
+                         "Hint:\tIs the debugfs filesystem mounted?\n"
+                         "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
+               break;
+       case EACCES:
+               scnprintf(buf, size,
+                         "Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
+                         "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
+                         debugfs_mountpoint, debugfs_mountpoint);
+               break;
+       default:
+               scnprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
+               break;
+       }
+
+       return 0;
+}