armv7m: add a TCP channel to stream captured trace

When trace capturing the trace is enabled using 'tpiu_config internal'
(via the internal mode), OpenOCD can collect the trace buffers then append
it to a specified file or named pipe and propagate the trace to 'tcl_trace'
command.
This change is allowing OpenOCD to stream the captured trace over TCP.

When using this configuration OpenOCD acts like a server and multiple
clients can connect and receive the captured trace.

Example on STM32F7 running at 216MHz:
  itm port 0 on
  tpiu config internal :3344 uart off 216000000


Change-Id: Idea43e7e26e87b98a33da7fb9acf7ea50fe3b345
Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-on: http://openocd.zylin.com/5345
Tested-by: jenkins
Reviewed-by: Karl Palsson <karlp@tweak.net.au>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/src/target/armv7m_trace.h b/src/target/armv7m_trace.h
index e5879fb..076f9d5 100644
--- a/src/target/armv7m_trace.h
+++ b/src/target/armv7m_trace.h
@@ -18,6 +18,7 @@
 #ifndef OPENOCD_TARGET_ARMV7M_TRACE_H
 #define OPENOCD_TARGET_ARMV7M_TRACE_H
 
+#include <server/server.h>
 #include <target/target.h>
 #include <command.h>
 
@@ -32,8 +33,14 @@ enum trace_config_type {
 	TRACE_CONFIG_TYPE_INTERNAL	/**< trace output is handled by OpenOCD adapter driver */
 };
 
+enum trace_internal_channel {
+	TRACE_INTERNAL_CHANNEL_TCL_ONLY,	/** trace data is sent only to 'tcl_trace'  */
+	TRACE_INTERNAL_CHANNEL_FILE,		/** trace data is appended to a file */
+	TRACE_INTERNAL_CHANNEL_TCP			/** trace data is appended to a TCP/IP port*/
+};
+
 enum tpiu_pin_protocol {
-	TPIU_PIN_PROTOCOL_SYNC,			/**< synchronous trace output */
+	TPIU_PIN_PROTOCOL_SYNC,				/**< synchronous trace output */
 	TPIU_PIN_PROTOCOL_ASYNC_MANCHESTER,	/**< asynchronous output with Manchester coding */
 	TPIU_PIN_PROTOCOL_ASYNC_UART		/**< asynchronous output with NRZ coding */
 };
@@ -49,6 +56,9 @@ struct armv7m_trace_config {
 	/** Currently active trace capture mode */
 	enum trace_config_type config_type;
 
+	/** The used channel when internal mode is selected */
+	enum trace_internal_channel internal_channel;
+
 	/** Currently active trace output mode */
 	enum tpiu_pin_protocol pin_protocol;
 	/** TPIU formatter enable/disable (in async mode) */
@@ -73,8 +83,10 @@ struct armv7m_trace_config {
 	unsigned int traceclkin_freq;
 	/** Current frequency of trace port */
 	unsigned int trace_freq;
-	/** Handle to output trace data in INTERNAL capture mode */
+	/** Handle to output trace data in INTERNAL capture mode via file */
 	FILE *trace_file;
+	/** Handle to output trace data in INTERNAL capture mode via tcp */
+	struct service *trace_service;
 };
 
 extern const struct command_registration armv7m_trace_command_handlers[];