pstore: Add persistent function tracing

[firefly-linux-kernel-4.4.55.git] / fs / pstore / ftrace.c

diff --git a/fs/pstore/ftrace.c b/fs/pstore/ftrace.c
new file mode 100644 (file)
index 0000000..a130d48
--- /dev/null
+++ b/fs/pstore/ftrace.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2012  Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/compiler.h>
+#include <linux/irqflags.h>
+#include <linux/percpu.h>
+#include <linux/smp.h>
+#include <linux/atomic.h>
+#include <asm/barrier.h>
+#include "internal.h"
+
+void notrace pstore_ftrace_call(unsigned long ip, unsigned long parent_ip)
+{
+       struct pstore_ftrace_record rec = {};
+
+       if (unlikely(oops_in_progress))
+               return;
+
+       rec.ip = ip;
+       rec.parent_ip = parent_ip;
+       pstore_ftrace_encode_cpu(&rec, raw_smp_processor_id());
+       psinfo->write_buf(PSTORE_TYPE_FTRACE, 0, NULL, 0, (void *)&rec,
+                         sizeof(rec), psinfo);
+}