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SubjectRe: [PATCH v5] chrome/platform: cros_ec_proto: Add trace event to trace EC commands
On Mon, 15 Apr 2019 14:57:04 -0600
Raul E Rangel <rrangel@chromium.org> wrote:

> This is useful to see which EC commands are being executed and when.
>
> To enable:
>
> echo 'cros_ec:*' >> /sys/kernel/debug/tracing/set_event

Note, you can accomplish the same thing with:

echo 1 > /sys/kernel/debug/tracing/events/cros_ec/enable

That's the "new" way to do things. The set_event only hangs around for
historical (and compatibility) reasons.


>
> Example:
>
> /* cros_ec_cmd: version: 0, command: EC_CMD_GET_VERSION */
> /* cros_ec_cmd: version: 0, command: EC_CMD_GET_PROTOCOL_INFO */
> /* cros_ec_cmd: version: 1, command: EC_CMD_GET_CMD_VERSIONS */
> /* cros_ec_cmd: version: 1, command: EC_CMD_USB_PD_CONTROL */
>
> Signed-off-by: Raul E Rangel <rrangel@chromium.org>
> Reviewed-by: Ross Zwisler <zwisler@google.com>

For the tracing side of things:

Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

-- Steve

> ---
>
> Changes in v5:
> - Rebased on upstream/master. It turns out upstream/master is missing a
> lot of changes to cros_ec_commands.h.
> - Replace SYM with SYMBOL in macro name.
>
> Changes in v4:
> - Use the full command name so go to definition continues to work in my
> editor.
>
> Changes in v3:
> - Use a macro to avoid duplicating the ec command names.
>
> Changes in v2:
> - Changed comment style to match other cros_ec files.
> - Fixed commit tag.
>
> drivers/platform/chrome/Makefile | 4 +-
> drivers/platform/chrome/cros_ec_proto.c | 4 +
> drivers/platform/chrome/cros_ec_trace.c | 121 ++++++++++++++++++++++++
> drivers/platform/chrome/cros_ec_trace.h | 51 ++++++++++
> 4 files changed, 179 insertions(+), 1 deletion(-)
> create mode 100644 drivers/platform/chrome/cros_ec_trace.c
> create mode 100644 drivers/platform/chrome/cros_ec_trace.h

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