[PATCH] platform/chrome: cros_ec_proto: Add response tracing

[Raul E Rangel]

Add the ability to view response codes as well.

I renamed the trace event from cros_ec_cmd to cros_ec_request and added
a cros_ec_response.

Example:
$ echo 1 > /sys/kernel/debug/tracing/events/cros_ec/enable
$ cat /sys/kernel/debug/tracing/trace

cros_ec_request: version: 1, command: EC_CMD_CONSOLE_READ
cros_ec_response: version: 1, command: EC_CMD_CONSOLE_READ, result: EC_RES_SUCCESS, rc: 0
cros_ec_request: version: 0, command: EC_CMD_USB_PD_POWER_INFO
cros_ec_response: version: 0, command: EC_CMD_USB_PD_POWER_INFO, result: EC_RES_SUCCESS, rc: 16

Signed-off-by: Raul E Rangel <rrangel@xxxxxxxxxxxx>
---

 drivers/platform/chrome/cros_ec_proto.c |  7 +++++-
 drivers/platform/chrome/cros_ec_trace.c | 24 +++++++++++++++++++
 drivers/platform/chrome/cros_ec_trace.h | 32 +++++++++++++++++++++++--
 3 files changed, 60 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index bd485ce98a42..ef2229047e0f 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -54,7 +54,7 @@ static int send_command(struct cros_ec_device *ec_dev,
 	int ret;
 	int (*xfer_fxn)(struct cros_ec_device *ec, struct cros_ec_command *msg);
 
-	trace_cros_ec_cmd(msg);
+	trace_cros_ec_request(msg);
 
 	if (ec_dev->proto_version > 2)
 		xfer_fxn = ec_dev->pkt_xfer;
@@ -73,6 +73,8 @@ static int send_command(struct cros_ec_device *ec_dev,
 	}
 
 	ret = (*xfer_fxn)(ec_dev, msg);
+
+	trace_cros_ec_response(msg, ret);
 	if (msg->result == EC_RES_IN_PROGRESS) {
 		int i;
 		struct cros_ec_command *status_msg;
@@ -95,7 +97,10 @@ static int send_command(struct cros_ec_device *ec_dev,
 		for (i = 0; i < EC_COMMAND_RETRIES; i++) {
 			usleep_range(10000, 11000);
 
+			trace_cros_ec_request(status_msg);
 			ret = (*xfer_fxn)(ec_dev, status_msg);
+			trace_cros_ec_response(status_msg, ret);
+
 			if (ret == -EAGAIN)
 				continue;
 			if (ret < 0)
diff --git a/drivers/platform/chrome/cros_ec_trace.c b/drivers/platform/chrome/cros_ec_trace.c
index 6f80ff4532ae..28eb94d99ba2 100644
--- a/drivers/platform/chrome/cros_ec_trace.c
+++ b/drivers/platform/chrome/cros_ec_trace.c
@@ -120,5 +120,29 @@
 	TRACE_SYMBOL(EC_CMD_PD_GET_LOG_ENTRY), \
 	TRACE_SYMBOL(EC_CMD_USB_PD_MUX_INFO)
 
+// See enum ec_status
+#define EC_RESULT \
+	TRACE_SYMBOL(EC_RES_SUCCESS), \
+	TRACE_SYMBOL(EC_RES_INVALID_COMMAND), \
+	TRACE_SYMBOL(EC_RES_ERROR), \
+	TRACE_SYMBOL(EC_RES_INVALID_PARAM), \
+	TRACE_SYMBOL(EC_RES_ACCESS_DENIED), \
+	TRACE_SYMBOL(EC_RES_INVALID_RESPONSE), \
+	TRACE_SYMBOL(EC_RES_INVALID_VERSION), \
+	TRACE_SYMBOL(EC_RES_INVALID_CHECKSUM), \
+	TRACE_SYMBOL(EC_RES_IN_PROGRESS), \
+	TRACE_SYMBOL(EC_RES_UNAVAILABLE), \
+	TRACE_SYMBOL(EC_RES_TIMEOUT), \
+	TRACE_SYMBOL(EC_RES_OVERFLOW), \
+	TRACE_SYMBOL(EC_RES_INVALID_HEADER), \
+	TRACE_SYMBOL(EC_RES_REQUEST_TRUNCATED), \
+	TRACE_SYMBOL(EC_RES_RESPONSE_TOO_BIG), \
+	TRACE_SYMBOL(EC_RES_BUS_ERROR), \
+	TRACE_SYMBOL(EC_RES_BUSY), \
+	TRACE_SYMBOL(EC_RES_INVALID_HEADER_VERSION), \
+	TRACE_SYMBOL(EC_RES_INVALID_HEADER_CRC), \
+	TRACE_SYMBOL(EC_RES_INVALID_DATA_CRC), \
+	TRACE_SYMBOL(EC_RES_DUP_UNAVAILABLE)
+
 #define CREATE_TRACE_POINTS
 #include "cros_ec_trace.h"
diff --git a/drivers/platform/chrome/cros_ec_trace.h b/drivers/platform/chrome/cros_ec_trace.h
index 0dd4df30fa89..853eeaaac9da 100644
--- a/drivers/platform/chrome/cros_ec_trace.h
+++ b/drivers/platform/chrome/cros_ec_trace.h
@@ -18,7 +18,7 @@
 
 #include <linux/tracepoint.h>
 
-DECLARE_EVENT_CLASS(cros_ec_cmd_class,
+DECLARE_EVENT_CLASS(cros_ec_request_class,
 	TP_PROTO(struct cros_ec_command *cmd),
 	TP_ARGS(cmd),
 	TP_STRUCT__entry(
@@ -34,11 +34,39 @@ DECLARE_EVENT_CLASS(cros_ec_cmd_class,
 );
 
 
-DEFINE_EVENT(cros_ec_cmd_class, cros_ec_cmd,
+DEFINE_EVENT(cros_ec_request_class, cros_ec_request,
 	TP_PROTO(struct cros_ec_command *cmd),
 	TP_ARGS(cmd)
 );
 
+DECLARE_EVENT_CLASS(cros_ec_response_class,
+	TP_PROTO(struct cros_ec_command *cmd, int rc),
+	TP_ARGS(cmd, rc),
+	TP_STRUCT__entry(
+		__field(uint32_t, version)
+		__field(uint32_t, command)
+		__field(uint32_t, result)
+		__field(int, rc)
+	),
+	TP_fast_assign(
+		__entry->version = cmd->version;
+		__entry->command = cmd->command;
+		__entry->result = cmd->result;
+		__entry->rc = rc;
+	),
+	TP_printk("version: %u, command: %s, result: %s, rc: %d",
+		  __entry->version,
+		  __print_symbolic(__entry->command, EC_CMDS),
+		  __print_symbolic(__entry->result, EC_RESULT),
+		  __entry->rc)
+);
+
+
+DEFINE_EVENT(cros_ec_response_class, cros_ec_response,
+	TP_PROTO(struct cros_ec_command *cmd, int rc),
+	TP_ARGS(cmd, rc)
+);
+
 
 #endif /* _CROS_EC_TRACE_H_ */
 
-- 
2.24.0.432.g9d3f5f5b63-goog