linux-kernel - Re: [PATCH] perf/x86/intel: Use is_visible callback for default group

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Message-ID: <20190614102017.GA4325@krava>
Date:   Fri, 14 Jun 2019 12:20:17 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] perf/x86/intel: Use is_visible callback for default group

On Fri, May 24, 2019 at 03:21:52PM +0200, Jiri Olsa wrote:

SNIP

ping

jirka

> ---
> It's preffered to use group's is_visible callback, so
> we do not need to use condition attribute assignment.
> 
> Cc: Stephane Eranian <eranian@...gle.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Suggested-by: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  arch/x86/events/intel/core.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
> index 85afe7e98c7d..cfd61b71136d 100644
> --- a/arch/x86/events/intel/core.c
> +++ b/arch/x86/events/intel/core.c
> @@ -4386,7 +4386,7 @@ static DEVICE_ATTR(allow_tsx_force_abort, 0644,
>  
>  static struct attribute *intel_pmu_attrs[] = {
>  	&dev_attr_freeze_on_smi.attr,
> -	NULL, /* &dev_attr_allow_tsx_force_abort.attr.attr */
> +	&dev_attr_allow_tsx_force_abort.attr,
>  	NULL,
>  };
>  
> @@ -4414,6 +4414,15 @@ exra_is_visible(struct kobject *kobj, struct attribute *attr, int i)
>  	return x86_pmu.version >= 2 ? attr->mode : 0;
>  }
>  
> +static umode_t
> +default_is_visible(struct kobject *kobj, struct attribute *attr, int i)
> +{
> +	if (attr == &dev_attr_allow_tsx_force_abort.attr)
> +		return x86_pmu.flags & PMU_FL_TFA ? attr->mode : 0;
> +
> +	return attr->mode;
> +}
> +
>  static struct attribute_group group_events_td  = {
>  	.name = "events",
>  };
> @@ -4450,7 +4459,8 @@ static struct attribute_group group_format_extra_skl = {
>  };
>  
>  static struct attribute_group group_default = {
> -	.attrs = intel_pmu_attrs,
> +	.attrs      = intel_pmu_attrs,
> +	.is_visible = default_is_visible,
>  };
>  
>  static const struct attribute_group *attr_update[] = {
> @@ -4973,7 +4983,6 @@ __init int intel_pmu_init(void)
>  			x86_pmu.get_event_constraints = tfa_get_event_constraints;
>  			x86_pmu.enable_all = intel_tfa_pmu_enable_all;
>  			x86_pmu.commit_scheduling = intel_tfa_commit_scheduling;
> -			intel_pmu_attrs[1] = &dev_attr_allow_tsx_force_abort.attr;
>  		}
>  
>  		pr_cont("Skylake events, ");
> -- 
> 2.20.1
>