1 files changed, 66 insertions, 0 deletions

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 0bb9cf2d53e6..3fc20422c166 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -1098,6 +1098,71 @@ static struct trace_event trace_user_stack_event = {
         .funcs          = &trace_user_stack_funcs,
 };
 
+/* TRACE_HWLAT */
+static enum print_line_t
+trace_hwlat_print(struct trace_iterator *iter, int flags,
+                  struct trace_event *event)
+{
+        struct trace_entry *entry = iter->ent;
+        struct trace_seq *s = &iter->seq;
+        struct hwlat_entry *field;
+
+        trace_assign_type(field, entry);
+
+        trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%ld.%09ld",
+                         field->seqnum,
+                         field->duration,
+                         field->outer_duration,
+                         field->timestamp.tv_sec,
+                         field->timestamp.tv_nsec);
+
+        if (field->nmi_count) {
+                /*
+                 * The generic sched_clock() is not NMI safe, thus
+                 * we only record the count and not the time.
+                 */
+                if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
+                        trace_seq_printf(s, " nmi-total:%llu",
+                                         field->nmi_total_ts);
+                trace_seq_printf(s, " nmi-count:%u",
+                                 field->nmi_count);
+        }
+
+        trace_seq_putc(s, '\n');
+
+        return trace_handle_return(s);
+}
+
+
+static enum print_line_t
+trace_hwlat_raw(struct trace_iterator *iter, int flags,
+                struct trace_event *event)
+{
+        struct hwlat_entry *field;
+        struct trace_seq *s = &iter->seq;
+
+        trace_assign_type(field, iter->ent);
+
+        trace_seq_printf(s, "%llu %lld %ld %09ld %u\n",
+                         field->duration,
+                         field->outer_duration,
+                         field->timestamp.tv_sec,
+                         field->timestamp.tv_nsec,
+                         field->seqnum);
+
+        return trace_handle_return(s);
+}
+
+static struct trace_event_functions trace_hwlat_funcs = {
+        .trace          = trace_hwlat_print,
+        .raw            = trace_hwlat_raw,
+};
+
+static struct trace_event trace_hwlat_event = {
+        .type           = TRACE_HWLAT,
+        .funcs          = &trace_hwlat_funcs,
+};
+
 /* TRACE_BPUTS */
 static enum print_line_t
 trace_bputs_print(struct trace_iterator *iter, int flags,
@@ -1233,6 +1298,7 @@ static struct trace_event *events[] __initdata = {
         &trace_bputs_event,
         &trace_bprint_event,
         &trace_print_event,
+        &trace_hwlat_event,
         NULL
 };