5 files changed, 60 insertions, 0 deletions

diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 30a8cdcfd4a4..60a41b7069dd 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -45,6 +45,11 @@ const char *trace_print_array_seq(struct trace_seq *p,
 				   const void *buf, int count,
 				   size_t el_size);
 
+const char *
+trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
+			 int prefix_type, int rowsize, int groupsize,
+			 const void *buf, size_t len, bool ascii);
+
 struct trace_iterator;
 struct trace_event;
 
diff --git a/include/linux/trace_seq.h b/include/linux/trace_seq.h
index 6609b39a7232..6c30508fca19 100644
--- a/include/linux/trace_seq.h
+++ b/include/linux/trace_seq.h
@@ -92,6 +92,10 @@ extern int trace_seq_path(struct trace_seq *s, const struct path *path);
 extern void trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
 			     int nmaskbits);
 
+extern int trace_seq_hex_dump(struct trace_seq *s, const char *prefix_str,
+			      int prefix_type, int rowsize, int groupsize,
+			      const void *buf, size_t len, bool ascii);
+
 #else /* CONFIG_TRACING */
 static inline void trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
 {
diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h
index 4ecdfe2e3580..7089760d4c7a 100644
--- a/include/trace/trace_events.h
+++ b/include/trace/trace_events.h
@@ -340,6 +340,12 @@ TRACE_MAKE_SYSTEM_STR();
 		trace_print_array_seq(p, array, count, el_size);	\
 	})
 
+#undef __print_hex_dump
+#define __print_hex_dump(prefix_str, prefix_type,			\
+			 rowsize, groupsize, buf, len, ascii)		\
+	trace_print_hex_dump_seq(p, prefix_str, prefix_type,		\
+				 rowsize, groupsize, buf, len, ascii)
+
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
 static notrace enum print_line_t					\
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index d54ce252b05a..d9b4b7c22db4 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -274,6 +274,21 @@ trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
 }
 EXPORT_SYMBOL(trace_print_array_seq);
 
+const char *
+trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
+			 int prefix_type, int rowsize, int groupsize,
+			 const void *buf, size_t len, bool ascii)
+{
+	const char *ret = trace_seq_buffer_ptr(p);
+
+	trace_seq_putc(p, '\n');
+	trace_seq_hex_dump(p, prefix_str, prefix_type,
+			   rowsize, groupsize, buf, len, ascii);
+	trace_seq_putc(p, 0);
+	return ret;
+}
+EXPORT_SYMBOL(trace_print_hex_dump_seq);
+
 int trace_raw_output_prep(struct trace_iterator *iter,
 			  struct trace_event *trace_event)
 {
diff --git a/kernel/trace/trace_seq.c b/kernel/trace/trace_seq.c
index 6b1c562ffdaf..344e4c1aa09c 100644
--- a/kernel/trace/trace_seq.c
+++ b/kernel/trace/trace_seq.c
@@ -376,3 +376,33 @@ int trace_seq_to_user(struct trace_seq *s, char __user *ubuf, int cnt)
 	return seq_buf_to_user(&s->seq, ubuf, cnt);
 }
 EXPORT_SYMBOL_GPL(trace_seq_to_user);
+
+int trace_seq_hex_dump(struct trace_seq *s, const char *prefix_str,
+		       int prefix_type, int rowsize, int groupsize,
+		       const void *buf, size_t len, bool ascii)
+{
+		unsigned int save_len = s->seq.len;
+
+	if (s->full)
+		return 0;
+
+	__trace_seq_init(s);
+
+	if (TRACE_SEQ_BUF_LEFT(s) < 1) {
+		s->full = 1;
+		return 0;
+	}
+
+	seq_buf_hex_dump(&(s->seq), prefix_str,
+		   prefix_type, rowsize, groupsize,
+		   buf, len, ascii);
+
+	if (unlikely(seq_buf_has_overflowed(&s->seq))) {
+		s->seq.len = save_len;
+		s->full = 1;
+		return 0;
+	}
+
+	return 1;
+}
+EXPORT_SYMBOL(trace_seq_hex_dump);