ASoC: SOF: ipc4: add a command to start GDB

Add an IPC4 message type to start a firmware GDB debugging session.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

include/sound/sof/ipc4/header.h

@@ -123,8 +123,9 @@ enum sof_ipc4_global_msg {
 	/* Notification (FW to SW driver) */
 	SOF_IPC4_GLB_NOTIFICATION,
 
-	/* 28 .. 31: RESERVED - do not use */
+	/* 28 .. 30: RESERVED - do not use */
 
+	SOF_IPC4_GLB_ENTER_GDB = 31,
 	SOF_IPC4_GLB_TYPE_LAST,
 };
 

sound/soc/sof/ipc4.c

@@ -164,6 +164,7 @@ static const char * const ipc4_dbg_glb_msg_type[] = {
 	DBG_IPC4_MSG_TYPE_ENTRY(GLB_LOAD_LIBRARY_PREPARE),
 	DBG_IPC4_MSG_TYPE_ENTRY(GLB_INTERNAL_MESSAGE),
 	DBG_IPC4_MSG_TYPE_ENTRY(GLB_NOTIFICATION),
+	DBG_IPC4_MSG_TYPE_ENTRY(GLB_ENTER_GDB),
 };
 
 #define DBG_IPC4_NOTIFICATION_TYPE_ENTRY(type)	[SOF_IPC4_NOTIFY_##type] = #type