linux-kernel - Re: [PATCH RFC 3/4] driver/perf: Add identifier sysfs file for Yitian 710 DDR

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Date:   Wed, 29 Mar 2023 15:55:57 +0800
From:   Shuai Xue <xueshuai@...ux.alibaba.com>
To:     Jing Zhang <renyu.zj@...ux.alibaba.com>,
        John Garry <john.g.garry@...cle.com>,
        Ian Rogers <irogers@...gle.com>, Will Deacon <will@...nel.org>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org,
        Zhuo Song <zhuo.song@...ux.alibaba.com>
Subject: Re: [PATCH RFC 3/4] driver/perf: Add identifier sysfs file for Yitian
 710 DDR



On 2023/3/27 AM10:46, Jing Zhang wrote:
> To allow userspace to identify the specific implementation of the device,
> add an "identifier" sysfs file.
> 
> The perf tool can match the Yitian 710 DDR metric through the identifier.
> 
> Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>
> ---
>  drivers/perf/alibaba_uncore_drw_pmu.c | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/drivers/perf/alibaba_uncore_drw_pmu.c b/drivers/perf/alibaba_uncore_drw_pmu.c
> index a7689fe..6639a57 100644
> --- a/drivers/perf/alibaba_uncore_drw_pmu.c
> +++ b/drivers/perf/alibaba_uncore_drw_pmu.c
> @@ -236,10 +236,37 @@ static ssize_t ali_drw_pmu_cpumask_show(struct device *dev,
>  	.attrs = ali_drw_pmu_cpumask_attrs,
>  };
>  
> +static ssize_t ali_drw_pmu_identifier_show(struct device *dev,
> +					struct device_attribute *attr,
> +					char *page)
> +{
> +	return sysfs_emit(page, "%s\n", "ali_drw_yitian710");

Is it possible to rename identifier as "ali_drw_pmu"? I don't think we need only
limit alibaba_uncore_drw_pmu to Yitian710 SoC here.

Thank you.
Shuai

> +}
> +
> +static umode_t ali_drw_pmu_identifier_attr_visible(struct kobject *kobj,
> +						struct attribute *attr, int n)
> +{
> +	return attr->mode;
> +}
> +
> +static struct device_attribute ali_drw_pmu_identifier_attr =
> +	__ATTR(identifier, 0444, ali_drw_pmu_identifier_show, NULL);
> +
> +static struct attribute *ali_drw_pmu_identifier_attrs[] = {
> +	&ali_drw_pmu_identifier_attr.attr,
> +	NULL,
> +};
> +
> +static const struct attribute_group ali_drw_pmu_identifier_attr_group = {
> +	.attrs = ali_drw_pmu_identifier_attrs,
> +	.is_visible = ali_drw_pmu_identifier_attr_visible,
> +};
> +
>  static const struct attribute_group *ali_drw_pmu_attr_groups[] = {
>  	&ali_drw_pmu_events_attr_group,
>  	&ali_drw_pmu_cpumask_attr_group,
>  	&ali_drw_pmu_format_group,
> +	&ali_drw_pmu_identifier_attr_group,
>  	NULL,
>  };
>