linux-kernel - Re: [PATCH v6 06/10] perf/x86/rapl: Add arguments to the init and cleanup functions

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Message-ID: <Zx+EDmtALgLDRpQ0@BLRRASHENOY1.amd.com>
Date: Mon, 28 Oct 2024 18:01:10 +0530
From: "Gautham R. Shenoy" <gautham.shenoy@....com>
To: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
Cc: peterz@...radead.org, mingo@...hat.com, rui.zhang@...el.com,
	acme@...nel.org, namhyung@...nel.org, mark.rutland@....com,
	alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
	irogers@...gle.com, adrian.hunter@...el.com,
	kan.liang@...ux.intel.com, tglx@...utronix.de, bp@...en8.de,
	dave.hansen@...ux.intel.com, ananth.narayan@....com,
	kprateek.nayak@....com, ravi.bangoria@....com, x86@...nel.org,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 06/10] perf/x86/rapl: Add arguments to the init and
 cleanup functions

Hello Dhananjay,


On Fri, Oct 25, 2024 at 11:13:44AM +0000, Dhananjay Ugwekar wrote:
> Prepare for the addition of RAPL core energy counter support.
> 
> Add arguments to the init and cleanup functions, which will help in
> initialization and cleaning up of two separate PMUs.
> 
> No functional change.
> 
> Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>

The patch looks good to me.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>

--
Thanks and Regards
gautham.

> ---
>  arch/x86/events/rapl.c | 28 ++++++++++++++++------------
>  1 file changed, 16 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
> index 447f62caa5f9..bf6fee114294 100644
> --- a/arch/x86/events/rapl.c
> +++ b/arch/x86/events/rapl.c
> @@ -597,7 +597,7 @@ static void __init rapl_advertise(void)
>  	}
>  }
>  
> -static void cleanup_rapl_pmus(void)
> +static void cleanup_rapl_pmus(struct rapl_pmus *rapl_pmus)
>  {
>  	int i;
>  
> @@ -615,7 +615,7 @@ static const struct attribute_group *rapl_attr_update[] = {
>  	NULL,
>  };
>  
> -static int __init init_rapl_pmu(void)
> +static int __init init_rapl_pmu(struct rapl_pmus *rapl_pmus)
>  {
>  	struct rapl_pmu *rapl_pmu;
>  	int idx;
> @@ -641,20 +641,20 @@ static int __init init_rapl_pmu(void)
>  	return -ENOMEM;
>  }
>  
> -static int __init init_rapl_pmus(void)
> +static int __init init_rapl_pmus(struct rapl_pmus **rapl_pmus_ptr, int rapl_pmu_scope)
>  {
>  	int nr_rapl_pmu = topology_max_packages();
> -	int rapl_pmu_scope = PERF_PMU_SCOPE_PKG;
> +	struct rapl_pmus *rapl_pmus;
>  
> -	if (!rapl_pmu_is_pkg_scope()) {
> -		nr_rapl_pmu *= topology_max_dies_per_package();
> -		rapl_pmu_scope = PERF_PMU_SCOPE_DIE;
> -	}
> +	if (rapl_pmu_scope == PERF_PMU_SCOPE_DIE)
> +		nr_rapl_pmu	*= topology_max_dies_per_package();
>  
>  	rapl_pmus = kzalloc(struct_size(rapl_pmus, rapl_pmu, nr_rapl_pmu), GFP_KERNEL);
>  	if (!rapl_pmus)
>  		return -ENOMEM;
>  
> +	*rapl_pmus_ptr = rapl_pmus;
> +
>  	rapl_pmus->nr_rapl_pmu		= nr_rapl_pmu;
>  	rapl_pmus->pmu.attr_groups	= rapl_attr_groups;
>  	rapl_pmus->pmu.attr_update	= rapl_attr_update;
> @@ -669,7 +669,7 @@ static int __init init_rapl_pmus(void)
>  	rapl_pmus->pmu.module		= THIS_MODULE;
>  	rapl_pmus->pmu.capabilities	= PERF_PMU_CAP_NO_EXCLUDE;
>  
> -	return init_rapl_pmu();
> +	return init_rapl_pmu(rapl_pmus);
>  }
>  
>  static struct rapl_model model_snb = {
> @@ -793,8 +793,12 @@ MODULE_DEVICE_TABLE(x86cpu, rapl_model_match);
>  static int __init rapl_pmu_init(void)
>  {
>  	const struct x86_cpu_id *id;
> +	int rapl_pmu_scope = PERF_PMU_SCOPE_DIE;
>  	int ret;
>  
> +	if (rapl_pmu_is_pkg_scope())
> +		rapl_pmu_scope = PERF_PMU_SCOPE_PKG;
> +
>  	id = x86_match_cpu(rapl_model_match);
>  	if (!id)
>  		return -ENODEV;
> @@ -810,7 +814,7 @@ static int __init rapl_pmu_init(void)
>  	if (ret)
>  		return ret;
>  
> -	ret = init_rapl_pmus();
> +	ret = init_rapl_pmus(&rapl_pmus, rapl_pmu_scope);
>  	if (ret)
>  		return ret;
>  
> @@ -823,7 +827,7 @@ static int __init rapl_pmu_init(void)
>  
>  out:
>  	pr_warn("Initialization failed (%d), disabled\n", ret);
> -	cleanup_rapl_pmus();
> +	cleanup_rapl_pmus(rapl_pmus);
>  	return ret;
>  }
>  module_init(rapl_pmu_init);
> @@ -831,6 +835,6 @@ module_init(rapl_pmu_init);
>  static void __exit intel_rapl_exit(void)
>  {
>  	perf_pmu_unregister(&rapl_pmus->pmu);
> -	cleanup_rapl_pmus();
> +	cleanup_rapl_pmus(rapl_pmus);
>  }
>  module_exit(intel_rapl_exit);
> -- 
> 2.34.1
>