[Qemu-devel] [RFC v4][PATCH 2/3] Monitor command 'info trace'

[Prerna Saxena <prerna@linux.vnet.ibm.com>]

Monitor command 'info trace' to display contents of trace buffer

Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
---
 configure       |    3 +++
 monitor.c       |   12 ++++++++++++
 qemu-monitor.hx |    4 ++++
 simpletrace.c   |   12 ++++++++++++
 tracetool       |    1 +
 5 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index 675d0fc..56af8dd 100755
--- a/configure
+++ b/configure
@@ -2302,6 +2302,9 @@ bsd)
 esac
 
 echo "TRACE_BACKEND=$trace_backend" >> $config_host_mak
+if test "$trace_backend" = "simple"; then
+  echo "CONFIG_SIMPLE_TRACE=y" >> $config_host_mak
+fi
 if test "$trace_backend" = "ust"; then
   LIBS="-lust $LIBS"
 fi
diff --git a/monitor.c b/monitor.c
index ad50f12..8b60830 100644
--- a/monitor.c
+++ b/monitor.c
@@ -55,6 +55,9 @@
 #include "json-streamer.h"
 #include "json-parser.h"
 #include "osdep.h"
+#ifdef CONFIG_SIMPLE_TRACE
+#include "trace.h"
+#endif
 
 //#define DEBUG
 //#define DEBUG_COMPLETION
@@ -2780,6 +2783,15 @@ static const mon_cmd_t info_cmds[] = {
         .help       = "show roms",
         .mhandler.info = do_info_roms,
     },
+#if defined(CONFIG_SIMPLE_TRACE)
+    {
+        .name       = "trace",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show current contents of trace buffer",
+        .mhandler.info = do_info_trace,
+    },
+#endif
     {
         .name       = NULL,
     },
diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index b6e3467..766c30f 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -114,6 +114,10 @@ show migration status
 show balloon information
 @item info qtree
 show device tree
+#ifdef CONFIG_SIMPLE_TRACE
+@item info trace
+show contents of trace buffer
+#endif
 @end table
 ETEXI
 
diff --git a/simpletrace.c b/simpletrace.c
index b488380..5734d15 100644
--- a/simpletrace.c
+++ b/simpletrace.c
@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include "monitor.h"
 #include "trace.h"
 
 typedef struct {
@@ -62,3 +63,14 @@ void trace4(TraceEventID event, unsigned long x1, unsigned long x2, unsigned lon
 void trace5(TraceEventID event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4, unsigned long x5) {
     trace(event, x1, x2, x3, x4, x5);
 }
+
+void do_info_trace(Monitor *mon)
+{
+    unsigned int i;
+
+    for (i = 0; i < trace_idx ; i++) {
+        monitor_printf(mon, "Event %lu : %lx %lx %lx %lx %lx\n",
+                          trace_buf[i].event, trace_buf[i].x1, trace_buf[i].x2,
+                            trace_buf[i].x3, trace_buf[i].x4, trace_buf[i].x5);
+    }
+}
diff --git a/tracetool b/tracetool
index 0dc7f1b..6f8f8a9 100755
--- a/tracetool
+++ b/tracetool
@@ -130,6 +130,7 @@ void trace2(TraceEventID event, unsigned long x1, unsigned long x2);
 void trace3(TraceEventID event, unsigned long x1, unsigned long x2, unsigned long x3);
 void trace4(TraceEventID event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4);
 void trace5(TraceEventID event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4, unsigned long x5);
+void do_info_trace(Monitor *mon);
 EOF
 
     simple_event_num=0
-- 
1.6.2.5



-- 
Prerna Saxena

Linux Technology Centre,
IBM Systems and Technology Lab,
Bangalore, India