linux-kernel - Re: [PATCH v3 11/20] perf arm-spe: Add new function arm_spe_pkt_desc

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Date:   Fri, 23 Oct 2020 18:10:18 +0100
From:   André Przywara <andre.przywara@....com>
To:     Leo Yan <leo.yan@...aro.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Wei Li <liwei391@...wei.com>,
        James Clark <james.clark@....com>, Al Grant <Al.Grant@....com>,
        Dave Martin <Dave.Martin@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 11/20] perf arm-spe: Add new function
 arm_spe_pkt_desc_counter()

On 22/10/2020 15:58, Leo Yan wrote:
> This patch moves out the counter packet parsing code from
> arm_spe_pkt_desc() to the new function arm_spe_pkt_desc_counter().
> 
> Signed-off-by: Leo Yan <leo.yan@...aro.org>

Confirmed by diff'ing '-' vs. '+' to not introduce an actual change.

Reviewed-by: Andre Przywara <andre.przywara@....com>

Cheers,
Andre

> ---
>  .../arm-spe-decoder/arm-spe-pkt-decoder.c     | 64 +++++++++++--------
>  1 file changed, 37 insertions(+), 27 deletions(-)
> 
> diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
> index 1fc07c693640..023bcc9be3cc 100644
> --- a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
> +++ b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
> @@ -293,6 +293,42 @@ static int arm_spe_pkt_desc_addr(const struct arm_spe_pkt *packet,
>  	}
>  }
>  
> +static int arm_spe_pkt_desc_counter(const struct arm_spe_pkt *packet,
> +				    char *buf, size_t buf_len)
> +{
> +	u64 payload = packet->payload;
> +	const char *name = arm_spe_pkt_name(packet->type);
> +	size_t blen = buf_len;
> +	int ret;
> +
> +	ret = arm_spe_pkt_snprintf(&buf, &blen, "%s %d ", name,
> +				   (unsigned short)payload);
> +	if (ret < 0)
> +		return ret;
> +
> +	switch (packet->index) {
> +	case 0:
> +		ret = arm_spe_pkt_snprintf(&buf, &blen, "TOT");
> +		if (ret < 0)
> +			return ret;
> +		break;
> +	case 1:
> +		ret = arm_spe_pkt_snprintf(&buf, &blen, "ISSUE");
> +		if (ret < 0)
> +			return ret;
> +		break;
> +	case 2:
> +		ret = arm_spe_pkt_snprintf(&buf, &blen, "XLAT");
> +		if (ret < 0)
> +			return ret;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	return buf_len - blen;
> +}
> +
>  int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
>  		     size_t buf_len)
>  {
> @@ -435,33 +471,7 @@ int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
>  		return arm_spe_pkt_snprintf(&buf, &blen, "%s 0x%lx el%d",
>  					    name, (unsigned long)payload, idx + 1);
>  	case ARM_SPE_COUNTER:
> -		ret = arm_spe_pkt_snprintf(&buf, &blen, "%s %d ", name,
> -					   (unsigned short)payload);
> -		if (ret < 0)
> -			return ret;
> -
> -		switch (idx) {
> -		case 0:
> -			ret = arm_spe_pkt_snprintf(&buf, &blen, "TOT");
> -			if (ret < 0)
> -				return ret;
> -			break;
> -		case 1:
> -			ret = arm_spe_pkt_snprintf(&buf, &blen, "ISSUE");
> -			if (ret < 0)
> -				return ret;
> -			break;
> -		case 2:
> -			ret = arm_spe_pkt_snprintf(&buf, &blen, "XLAT");
> -			if (ret < 0)
> -				return ret;
> -			break;
> -		default:
> -			break;
> -		}
> -
> -		return buf_len - blen;
> -
> +		return arm_spe_pkt_desc_counter(packet, buf, buf_len);
>  	default:
>  		break;
>  	}
>