linux-kernel - Re: [PATCH 1/6] perf cs-etm: Refactor initialisation of decoder params.

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Message-ID: <20210731054822.GA7437@leoy-ThinkPad-X240s>
Date:   Sat, 31 Jul 2021 13:48:22 +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 1/6] perf cs-etm: Refactor initialisation of decoder
 params.

On Wed, Jul 21, 2021 at 10:07:00AM +0100, James Clark wrote:
> The initialisation of the decoder params is duplicated between
> creation of the packet printer and packet decoder. Put them both
> into one function so that future changes only need to be made in one
> place.
> 
> Signed-off-by: James Clark <james.clark@....com>

It's good to wait for Mathieu's review, I reviewed this patch and it's
good for me:

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

> ---
>  .../perf/util/cs-etm-decoder/cs-etm-decoder.c | 99 +++++--------------
>  1 file changed, 25 insertions(+), 74 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 ed1f0326f859..30889a9d0165 100644
> --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> @@ -227,55 +227,6 @@ cs_etm_decoder__init_raw_frame_logging(
>  }
>  #endif
>  
> -static int cs_etm_decoder__create_packet_printer(struct cs_etm_decoder *decoder,
> -						 const char *decoder_name,
> -						 void *trace_config)
> -{
> -	u8 csid;
> -
> -	if (ocsd_dt_create_decoder(decoder->dcd_tree, decoder_name,
> -				   OCSD_CREATE_FLG_PACKET_PROC,
> -				   trace_config, &csid))
> -		return -1;
> -
> -	if (ocsd_dt_set_pkt_protocol_printer(decoder->dcd_tree, csid, 0))
> -		return -1;
> -
> -	return 0;
> -}
> -
> -static int
> -cs_etm_decoder__create_etm_packet_printer(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;
> -	void *trace_config;
> -
> -	switch (t_params->protocol) {
> -	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) ?
> -							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;
> -		trace_config = &trace_config_etmv4;
> -		break;
> -	default:
> -		return -1;
> -	}
> -
> -	return cs_etm_decoder__create_packet_printer(decoder,
> -						     decoder_name,
> -						     trace_config);
> -}
> -
>  static ocsd_datapath_resp_t
>  cs_etm_decoder__do_soft_timestamp(struct cs_etm_queue *etmq,
>  				  struct cs_etm_packet_queue *packet_queue,
> @@ -629,9 +580,10 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
>  	return resp;
>  }
>  
> -static int cs_etm_decoder__create_etm_packet_decoder(
> -					struct cs_etm_trace_params *t_params,
> -					struct cs_etm_decoder *decoder)
> +static int
> +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;
> @@ -657,31 +609,30 @@ static int cs_etm_decoder__create_etm_packet_decoder(
>  		return -1;
>  	}
>  
> -	if (ocsd_dt_create_decoder(decoder->dcd_tree,
> -				     decoder_name,
> -				     OCSD_CREATE_FLG_FULL_DECODER,
> -				     trace_config, &csid))
> -		return -1;
> +	if (d_params->operation == CS_ETM_OPERATION_DECODE) {
> +		if (ocsd_dt_create_decoder(decoder->dcd_tree,
> +					   decoder_name,
> +					   OCSD_CREATE_FLG_FULL_DECODER,
> +					   trace_config, &csid))
> +			return -1;
>  
> -	if (ocsd_dt_set_gen_elem_outfn(decoder->dcd_tree,
> -				       cs_etm_decoder__gen_trace_elem_printer,
> -				       decoder))
> -		return -1;
> +		if (ocsd_dt_set_gen_elem_outfn(decoder->dcd_tree,
> +					       cs_etm_decoder__gen_trace_elem_printer,
> +					       decoder))
> +			return -1;
>  
> -	return 0;
> -}
> +		return 0;
> +	} else if (d_params->operation == CS_ETM_OPERATION_PRINT) {
> +		if (ocsd_dt_create_decoder(decoder->dcd_tree, decoder_name,
> +					   OCSD_CREATE_FLG_PACKET_PROC,
> +					   trace_config, &csid))
> +			return -1;
>  
> -static int
> -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)
> -{
> -	if (d_params->operation == CS_ETM_OPERATION_PRINT)
> -		return cs_etm_decoder__create_etm_packet_printer(t_params,
> -								 decoder);
> -	else if (d_params->operation == CS_ETM_OPERATION_DECODE)
> -		return cs_etm_decoder__create_etm_packet_decoder(t_params,
> -								 decoder);
> +		if (ocsd_dt_set_pkt_protocol_printer(decoder->dcd_tree, csid, 0))
> +			return -1;
> +
> +		return 0;
> +	}
>  
>  	return -1;
>  }
> -- 
> 2.28.0
>