linux-kernel - Re: [PATCH 6/6] perf cs-etm: Print the decoder name

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Message-ID: <20210731073037.GF7437@leoy-ThinkPad-X240s>
Date:   Sat, 31 Jul 2021 15:30:37 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     James Clark <james.clark@....com>
Cc:     acme@...nel.org, mathieu.poirier@...aro.org,
        coresight@...ts.linaro.org, al.grant@....com,
        suzuki.poulose@....com, anshuman.khandual@....com,
        mike.leach@...aro.org, John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 6/6] perf cs-etm: Print the decoder name

On Wed, Jul 21, 2021 at 10:07:05AM +0100, James Clark wrote:
> Use the real name of the decoder instead of hard-coding "ETM" to avoid
> confusion when the trace is ETE. This also now distinguishes between
> ETMv3 and ETMv4.
> 
> Signed-off-by: James Clark <james.clark@....com>
> ---
>  tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 17 +++++++++++------
>  tools/perf/util/cs-etm-decoder/cs-etm-decoder.h |  1 +
>  tools/perf/util/cs-etm.c                        |  4 ++--
>  3 files changed, 14 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> index 37bc9d6a7677..177c08f5be8d 100644
> --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> @@ -37,6 +37,7 @@ struct cs_etm_decoder {
>  	dcd_tree_handle_t dcd_tree;
>  	cs_etm_mem_cb_type mem_access;
>  	ocsd_datapath_resp_t prev_return;
> +	const char *decoder_name;
>  };
>  
>  static u32
> @@ -614,7 +615,6 @@ cs_etm_decoder__create_etm_decoder(struct cs_etm_decoder_params *d_params,
>  				   struct cs_etm_trace_params *t_params,
>  				   struct cs_etm_decoder *decoder)
>  {
> -	const char *decoder_name;
>  	ocsd_etmv3_cfg config_etmv3;
>  	ocsd_etmv4_cfg trace_config_etmv4;
>  	ocsd_ete_cfg trace_config_ete;
> @@ -625,19 +625,19 @@ cs_etm_decoder__create_etm_decoder(struct cs_etm_decoder_params *d_params,
>  	case CS_ETM_PROTO_ETMV3:
>  	case CS_ETM_PROTO_PTM:
>  		cs_etm_decoder__gen_etmv3_config(t_params, &config_etmv3);
> -		decoder_name = (t_params->protocol == CS_ETM_PROTO_ETMV3) ?
> +		decoder->decoder_name = (t_params->protocol == CS_ETM_PROTO_ETMV3) ?
>  							OCSD_BUILTIN_DCD_ETMV3 :
>  							OCSD_BUILTIN_DCD_PTM;
>  		trace_config = &config_etmv3;
>  		break;
>  	case CS_ETM_PROTO_ETMV4i:
>  		cs_etm_decoder__gen_etmv4_config(t_params, &trace_config_etmv4);
> -		decoder_name = OCSD_BUILTIN_DCD_ETMV4I;
> +		decoder->decoder_name = OCSD_BUILTIN_DCD_ETMV4I;
>  		trace_config = &trace_config_etmv4;
>  		break;
>  	case CS_ETM_PROTO_ETE:
>  		cs_etm_decoder__gen_ete_config(t_params, &trace_config_ete);
> -		decoder_name = OCSD_BUILTIN_DCD_ETE;
> +		decoder->decoder_name = OCSD_BUILTIN_DCD_ETE;
>  		trace_config = &trace_config_ete;
>  		break;
>  	default:
> @@ -646,7 +646,7 @@ cs_etm_decoder__create_etm_decoder(struct cs_etm_decoder_params *d_params,
>  
>  	if (d_params->operation == CS_ETM_OPERATION_DECODE) {
>  		if (ocsd_dt_create_decoder(decoder->dcd_tree,
> -					   decoder_name,
> +					   decoder->decoder_name,
>  					   OCSD_CREATE_FLG_FULL_DECODER,
>  					   trace_config, &csid))
>  			return -1;
> @@ -658,7 +658,7 @@ cs_etm_decoder__create_etm_decoder(struct cs_etm_decoder_params *d_params,
>  
>  		return 0;
>  	} else if (d_params->operation == CS_ETM_OPERATION_PRINT) {
> -		if (ocsd_dt_create_decoder(decoder->dcd_tree, decoder_name,
> +		if (ocsd_dt_create_decoder(decoder->dcd_tree, decoder->decoder_name,
>  					   OCSD_CREATE_FLG_PACKET_PROC,
>  					   trace_config, &csid))
>  			return -1;
> @@ -790,3 +790,8 @@ void cs_etm_decoder__free(struct cs_etm_decoder *decoder)
>  	decoder->dcd_tree = NULL;
>  	free(decoder);
>  }
> +
> +const char *cs_etm_decoder__get_name(struct cs_etm_decoder *decoder)
> +{
> +	return decoder->decoder_name;
> +}

Maybe can consider to place this function into the header file with
"static inline" specifier.

Either way, this patch looks good to me:

Reviewed-by: Leo Yan <leo.yan@...aro.org>

> diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
> index 9137796fe3c5..fbd6786baf99 100644
> --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
> +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
> @@ -99,5 +99,6 @@ int cs_etm_decoder__get_packet(struct cs_etm_packet_queue *packet_queue,
>  			       struct cs_etm_packet *packet);
>  
>  int cs_etm_decoder__reset(struct cs_etm_decoder *decoder);
> +const char *cs_etm_decoder__get_name(struct cs_etm_decoder *decoder);
>  
>  #endif /* INCLUDE__CS_ETM_DECODER_H__ */
> diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
> index 870073bce670..bb7957afd9cb 100644
> --- a/tools/perf/util/cs-etm.c
> +++ b/tools/perf/util/cs-etm.c
> @@ -564,8 +564,8 @@ static void cs_etm__dump_event(struct cs_etm_queue *etmq,
>  
>  	fprintf(stdout, "\n");
>  	color_fprintf(stdout, color,
> -		     ". ... CoreSight ETM Trace data: size %zu bytes\n",
> -		     buffer->size);
> +		     ". ... CoreSight %s Trace data: size %zu bytes\n",
> +		     cs_etm_decoder__get_name(etmq->decoder), buffer->size);
>  
>  	do {
>  		size_t consumed;
> -- 
> 2.28.0
>