linux-kernel - Re: [PATCH v2 3/9] perf cs-etm: Refactor out ETMv4 header saving

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Date:   Tue, 24 Aug 2021 14:58:48 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     James Clark <james.clark@....com>
Cc:     mathieu.poirier@...aro.org, coresight@...ts.linaro.org,
        linux-perf-users@...r.kernel.org, mike.leach@...aro.org,
        acme@...nel.org, suzuki.poulose@....com,
        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
Subject: Re: [PATCH v2 3/9] perf cs-etm: Refactor out ETMv4 header saving

On Fri, Aug 06, 2021 at 02:41:03PM +0100, James Clark wrote:
> Extract a function for saving the ETMv4 header because this will be used
> for ETE in a later commit.
> 
> Signed-off-by: James Clark <james.clark@....com>

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

> ---
>  tools/perf/arch/arm/util/cs-etm.c | 46 +++++++++++++++----------------
>  1 file changed, 23 insertions(+), 23 deletions(-)
> 
> diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
> index 85168d87b2d7..ecb6fa55a210 100644
> --- a/tools/perf/arch/arm/util/cs-etm.c
> +++ b/tools/perf/arch/arm/util/cs-etm.c
> @@ -607,6 +607,28 @@ static int cs_etm_get_ro(struct perf_pmu *pmu, int cpu, const char *path)
>  	return val;
>  }
>  
> +static void cs_etm_save_etmv4_header(__u64 data[], struct auxtrace_record *itr, int cpu)
> +{
> +	struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr);
> +	struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
> +
> +	/* Get trace configuration register */
> +	data[CS_ETMV4_TRCCONFIGR] = cs_etmv4_get_config(itr);
> +	/* Get traceID from the framework */
> +	data[CS_ETMV4_TRCTRACEIDR] = coresight_get_trace_id(cpu);
> +	/* Get read-only information from sysFS */
> +	data[CS_ETMV4_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu,
> +					       metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
> +	data[CS_ETMV4_TRCIDR1] = cs_etm_get_ro(cs_etm_pmu, cpu,
> +					       metadata_etmv4_ro[CS_ETMV4_TRCIDR1]);
> +	data[CS_ETMV4_TRCIDR2] = cs_etm_get_ro(cs_etm_pmu, cpu,
> +					       metadata_etmv4_ro[CS_ETMV4_TRCIDR2]);
> +	data[CS_ETMV4_TRCIDR8] = cs_etm_get_ro(cs_etm_pmu, cpu,
> +					       metadata_etmv4_ro[CS_ETMV4_TRCIDR8]);
> +	data[CS_ETMV4_TRCAUTHSTATUS] = cs_etm_get_ro(cs_etm_pmu, cpu,
> +						     metadata_etmv4_ro[CS_ETMV4_TRCAUTHSTATUS]);
> +}
> +
>  static void cs_etm_get_metadata(int cpu, u32 *offset,
>  				struct auxtrace_record *itr,
>  				struct perf_record_auxtrace_info *info)
> @@ -620,29 +642,7 @@ static void cs_etm_get_metadata(int cpu, u32 *offset,
>  	/* first see what kind of tracer this cpu is affined to */
>  	if (cs_etm_is_etmv4(itr, cpu)) {
>  		magic = __perf_cs_etmv4_magic;
> -		/* Get trace configuration register */
> -		info->priv[*offset + CS_ETMV4_TRCCONFIGR] =
> -						cs_etmv4_get_config(itr);
> -		/* Get traceID from the framework */
> -		info->priv[*offset + CS_ETMV4_TRCTRACEIDR] =
> -						coresight_get_trace_id(cpu);
> -		/* Get read-only information from sysFS */
> -		info->priv[*offset + CS_ETMV4_TRCIDR0] =
> -			cs_etm_get_ro(cs_etm_pmu, cpu,
> -				      metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
> -		info->priv[*offset + CS_ETMV4_TRCIDR1] =
> -			cs_etm_get_ro(cs_etm_pmu, cpu,
> -				      metadata_etmv4_ro[CS_ETMV4_TRCIDR1]);
> -		info->priv[*offset + CS_ETMV4_TRCIDR2] =
> -			cs_etm_get_ro(cs_etm_pmu, cpu,
> -				      metadata_etmv4_ro[CS_ETMV4_TRCIDR2]);
> -		info->priv[*offset + CS_ETMV4_TRCIDR8] =
> -			cs_etm_get_ro(cs_etm_pmu, cpu,
> -				      metadata_etmv4_ro[CS_ETMV4_TRCIDR8]);
> -		info->priv[*offset + CS_ETMV4_TRCAUTHSTATUS] =
> -			cs_etm_get_ro(cs_etm_pmu, cpu,
> -				      metadata_etmv4_ro
> -				      [CS_ETMV4_TRCAUTHSTATUS]);
> +		cs_etm_save_etmv4_header(&info->priv[*offset], itr, cpu);
>  
>  		/* How much space was used */
>  		increment = CS_ETMV4_PRIV_MAX;
> -- 
> 2.28.0
>