linux-kernel - Re: [PATCH] platform: cros_ec: Add fields to command traces

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Date:   Tue, 1 Sep 2020 11:10:54 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Gwendal Grignou <gwendal@...omium.org>, rrangel@...omium.org,
        groeck@...omium.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform: cros_ec: Add fields to command traces

Hi Gwendal,

On 15/8/20 5:39, Gwendal Grignou wrote:
> In ftrace, add more fields to the cros_ec command event:
> - Add size of commands to check if they are properly set.
> - Add offset (in case an EC is cascaded being another EC),
> to allow proper command output
> 
> With:
> echo 1 > events/cros_ec/cros_ec_cmd/enable
> We now have (on samus)
> 
> invalid command for the sensor stack:
> ectool-6942  [002] ....  3082.783116: cros_ec_request_done: version: 3,
>  offset: 0, command: EC_CMD_MOTION_SENSE_CMD, outsize: 2, insize: 19,
>  ec result: EC_RES_INVALID_PARAM, retval: 0
> 
> powerd accessing PD EC being the main EC:
> powerd-1272  [002] ....    40.644026: cros_ec_request_done: version: 0,
>  offset: 1, command: EC_CMD_USB_PD_POWER_INFO, outsize: 1, insize: 16,
>  ec result: EC_RES_SUCCESS, retval: 16
> 
> Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
> ---

Applied for 5.10.

Thanks,
 Enric


>  drivers/platform/chrome/cros_ec_trace.h | 27 +++++++++++++++++++------
>  1 file changed, 21 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/platform/chrome/cros_ec_trace.h b/drivers/platform/chrome/cros_ec_trace.h
> index e9fb05f89ef07..f744b21bc655f 100644
> --- a/drivers/platform/chrome/cros_ec_trace.h
> +++ b/drivers/platform/chrome/cros_ec_trace.h
> @@ -23,14 +23,22 @@ TRACE_EVENT(cros_ec_request_start,
>  	TP_ARGS(cmd),
>  	TP_STRUCT__entry(
>  		__field(uint32_t, version)
> +		__field(uint32_t, offset)
>  		__field(uint32_t, command)
> +		__field(uint32_t, outsize)
> +		__field(uint32_t, insize)
>  	),
>  	TP_fast_assign(
>  		__entry->version = cmd->version;
> -		__entry->command = cmd->command;
> +		__entry->offset = cmd->command / EC_CMD_PASSTHRU_OFFSET(1);
> +		__entry->command = cmd->command % EC_CMD_PASSTHRU_OFFSET(1);
> +		__entry->outsize = cmd->outsize;
> +		__entry->insize = cmd->insize;
>  	),
> -	TP_printk("version: %u, command: %s", __entry->version,
> -		  __print_symbolic(__entry->command, EC_CMDS))
> +	TP_printk("version: %u, offset: %d, command: %s, outsize: %u, insize: %u",
> +		  __entry->version, __entry->offset,
> +		  __print_symbolic(__entry->command, EC_CMDS),
> +		  __entry->outsize, __entry->insize)
>  );
>  
>  TRACE_EVENT(cros_ec_request_done,
> @@ -38,19 +46,26 @@ TRACE_EVENT(cros_ec_request_done,
>  	TP_ARGS(cmd, retval),
>  	TP_STRUCT__entry(
>  		__field(uint32_t, version)
> +		__field(uint32_t, offset)
>  		__field(uint32_t, command)
> +		__field(uint32_t, outsize)
> +		__field(uint32_t, insize)
>  		__field(uint32_t, result)
>  		__field(int, retval)
>  	),
>  	TP_fast_assign(
>  		__entry->version = cmd->version;
> -		__entry->command = cmd->command;
> +		__entry->offset = cmd->command / EC_CMD_PASSTHRU_OFFSET(1);
> +		__entry->command = cmd->command % EC_CMD_PASSTHRU_OFFSET(1);
> +		__entry->outsize = cmd->outsize;
> +		__entry->insize = cmd->insize;
>  		__entry->result = cmd->result;
>  		__entry->retval = retval;
>  	),
> -	TP_printk("version: %u, command: %s, ec result: %s, retval: %d",
> -		  __entry->version,
> +	TP_printk("version: %u, offset: %d, command: %s, outsize: %u, insize: %u, ec result: %s, retval: %u",
> +		  __entry->version, __entry->offset,
>  		  __print_symbolic(__entry->command, EC_CMDS),
> +		  __entry->outsize, __entry->insize,
>  		  __print_symbolic(__entry->result, EC_RESULT),
>  		  __entry->retval)
>  );
>