drm/amdgpu: add condition check for trace_amdgpu_cs()

v1:
add trace event enabled check to avoid nop loop when submit multi ibs
in amdgpu_cs_ioctl() function.

v2:
add a new wrapper function to trace all amdgpu cs ibs.
Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

@@ -1275,13 +1275,24 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
 	return r;
 }
 
+static void trace_amdgpu_cs_ibs(struct amdgpu_cs_parser *parser)
+{
+	int i;
+
+	if (!trace_amdgpu_cs_enabled())
+		return;
+
+	for (i = 0; i < parser->job->num_ibs; i++)
+		trace_amdgpu_cs(parser, i);
+}
+
 int amdgpu_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 {
 	struct amdgpu_device *adev = dev->dev_private;
 	union drm_amdgpu_cs *cs = data;
 	struct amdgpu_cs_parser parser = {};
 	bool reserved_buffers = false;
-	int i, r;
+	int r;
 
 	if (amdgpu_ras_intr_triggered())
 		return -EHWPOISON;
@@ -1319,8 +1330,7 @@ int amdgpu_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 
 	reserved_buffers = true;
 
-	for (i = 0; i < parser.job->num_ibs; i++)
-		trace_amdgpu_cs(&parser, i);
+	trace_amdgpu_cs_ibs(&parser);
 
 	r = amdgpu_cs_vm_handling(&parser);
 	if (r)