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platform/chrome: cros_ec_proto: Add response tracing

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Add the ability to view response codes as well.

I dropped the EVENT_CLASS since there is only one event per class.

cros_ec_cmd has now been renamed to cros_ec_request_start.

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

369.416372: cros_ec_request_start: version: 0, command: EC_CMD_USB_PD_POWER_INFO
369.420528: cros_ec_request_done: version: 0, command: EC_CMD_USB_PD_POWER_INFO, ec result: EC_RES_SUCCESS, retval: 16
369.420529: cros_ec_request_start: version: 0, command: EC_CMD_USB_PD_DISCOVERY
369.421383: cros_ec_request_done: version: 0, command: EC_CMD_USB_PD_DISCOVERY, ec result: EC_RES_SUCCESS, retval: 5

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Raul E Rangel 2019-11-25 10:45:39 -07:00 committed by Enric Balletbo i Serra
parent 086338df1d
commit 205c9326fd
3 changed files with 49 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/platform/chrome/cros_ec_proto.c
View File

@ -54,8 +54,6 @@ 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);
if (ec_dev->proto_version > 2)
xfer_fxn = ec_dev->pkt_xfer;
else
@ -72,7 +70,9 @@ static int send_command(struct cros_ec_device *ec_dev,
return -EIO;
}
trace_cros_ec_request_start(msg);
ret = (*xfer_fxn)(ec_dev, msg);
trace_cros_ec_request_done(msg, ret);
if (msg->result == EC_RES_IN_PROGRESS) {
int i;
struct cros_ec_command *status_msg;
@ -95,7 +95,9 @@ 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_start(status_msg);
ret = (*xfer_fxn)(ec_dev, status_msg);
trace_cros_ec_request_done(status_msg, ret);
if (ret == -EAGAIN)
continue;
if (ret < 0)

24
drivers/platform/chrome/cros_ec_trace.c
View File

@ -182,5 +182,29 @@
TRACE_SYMBOL(EC_CMD_BOARD_SPECIFIC_BASE), \
TRACE_SYMBOL(EC_CMD_BOARD_SPECIFIC_LAST)
/* See the enum ec_status in include/linux/platform_data/cros_ec_commands.h */
#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"

26
drivers/platform/chrome/cros_ec_trace.h
View File

@ -18,7 +18,7 @@
#include <linux/tracepoint.h>
DECLARE_EVENT_CLASS(cros_ec_cmd_class,
TRACE_EVENT(cros_ec_request_start,
TP_PROTO(struct cros_ec_command *cmd),
TP_ARGS(cmd),
TP_STRUCT__entry(
@ -33,10 +33,26 @@ DECLARE_EVENT_CLASS(cros_ec_cmd_class,
__print_symbolic(__entry->command, EC_CMDS))
);
DEFINE_EVENT(cros_ec_cmd_class, cros_ec_cmd,
TP_PROTO(struct cros_ec_command *cmd),
TP_ARGS(cmd)
TRACE_EVENT(cros_ec_request_done,
TP_PROTO(struct cros_ec_command *cmd, int retval),
TP_ARGS(cmd, retval),
TP_STRUCT__entry(
__field(uint32_t, version)
__field(uint32_t, command)
__field(uint32_t, result)
__field(int, retval)
),
TP_fast_assign(
__entry->version = cmd->version;
__entry->command = cmd->command;
__entry->result = cmd->result;
__entry->retval = retval;
),
TP_printk("version: %u, command: %s, ec result: %s, retval: %d",
__entry->version,
__print_symbolic(__entry->command, EC_CMDS),
__print_symbolic(__entry->result, EC_RESULT),
__entry->retval)
);