linux-kernel - Re: [PATCH v3 08/20] perf arm-spe: Add new function arm_spe_pkt_desc

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Message-ID: <3428fe2c-77b1-1ad4-ddf6-513eb409c284@arm.com>
Date:   Fri, 23 Oct 2020 18:09:46 +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 08/20] perf arm-spe: Add new function
 arm_spe_pkt_desc_addr()

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

Can confirm the move is correct.

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

Cheers,
Andre

> ---
>  .../arm-spe-decoder/arm-spe-pkt-decoder.c     | 49 ++++++++++++-------
>  1 file changed, 30 insertions(+), 19 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 6f2329990729..550cd7648c73 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
> @@ -267,10 +267,38 @@ static int arm_spe_pkt_snprintf(char **buf_p, size_t *blen,
>  	return ret;
>  }
>  
> +static int arm_spe_pkt_desc_addr(const struct arm_spe_pkt *packet,
> +				 char *buf, size_t buf_len)
> +{
> +	int ns, el, idx = packet->index;
> +	u64 payload = packet->payload;
> +
> +	switch (idx) {
> +	case 0:
> +	case 1:
> +		ns = !!(packet->payload & NS_FLAG);
> +		el = (packet->payload & EL_FLAG) >> 61;
> +		payload &= ~(0xffULL << 56);
> +		return arm_spe_pkt_snprintf(&buf, &buf_len,
> +				"%s 0x%llx el%d ns=%d",
> +				(idx == 1) ? "TGT" : "PC", payload, el, ns);
> +	case 2:
> +		return arm_spe_pkt_snprintf(&buf, &buf_len,
> +					    "VA 0x%llx", payload);
> +	case 3:
> +		ns = !!(packet->payload & NS_FLAG);
> +		payload &= ~(0xffULL << 56);
> +		return arm_spe_pkt_snprintf(&buf, &buf_len,
> +					    "PA 0x%llx ns=%d", payload, ns);
> +	default:
> +		return 0;
> +	}
> +}
> +
>  int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
>  		     size_t buf_len)
>  {
> -	int ret, ns, el, idx = packet->index;
> +	int ret, idx = packet->index;
>  	unsigned long long payload = packet->payload;
>  	const char *name = arm_spe_pkt_name(packet->type);
>  	size_t blen = buf_len;
> @@ -404,24 +432,7 @@ int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
>  	case ARM_SPE_TIMESTAMP:
>  		return arm_spe_pkt_snprintf(&buf, &blen, "%s %lld", name, payload);
>  	case ARM_SPE_ADDRESS:
> -		switch (idx) {
> -		case 0:
> -		case 1: ns = !!(packet->payload & NS_FLAG);
> -			el = (packet->payload & EL_FLAG) >> 61;
> -			payload &= ~(0xffULL << 56);
> -			return arm_spe_pkt_snprintf(&buf, &blen,
> -					"%s 0x%llx el%d ns=%d",
> -				        (idx == 1) ? "TGT" : "PC", payload, el, ns);
> -		case 2:
> -			return arm_spe_pkt_snprintf(&buf, &blen,
> -						    "VA 0x%llx", payload);
> -		case 3:	ns = !!(packet->payload & NS_FLAG);
> -			payload &= ~(0xffULL << 56);
> -			return arm_spe_pkt_snprintf(&buf, &blen,
> -						    "PA 0x%llx ns=%d", payload, ns);
> -		default:
> -			return 0;
> -		}
> +		return arm_spe_pkt_desc_addr(packet, buf, buf_len);
>  	case ARM_SPE_CONTEXT:
>  		return arm_spe_pkt_snprintf(&buf, &blen, "%s 0x%lx el%d",
>  					    name, (unsigned long)payload, idx + 1);
>