linux-kernel - Re: [PATCH v6 05/10] perf/x86/rapl: Make rapl

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Message-ID: <4d0455229b6f5ddad851daf54557844a4a9a1071.camel@intel.com>
Date: Fri, 1 Nov 2024 07:29:10 +0000
From: "Zhang, Rui" <rui.zhang@...el.com>
To: "alexander.shishkin@...ux.intel.com" <alexander.shishkin@...ux.intel.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>, "bp@...en8.de" <bp@...en8.de>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"peterz@...radead.org" <peterz@...radead.org>, "mark.rutland@....com"
	<mark.rutland@....com>, "mingo@...hat.com" <mingo@...hat.com>,
	"Dhananjay.Ugwekar@....com" <Dhananjay.Ugwekar@....com>, "acme@...nel.org"
	<acme@...nel.org>, "namhyung@...nel.org" <namhyung@...nel.org>,
	"jolsa@...nel.org" <jolsa@...nel.org>, "kan.liang@...ux.intel.com"
	<kan.liang@...ux.intel.com>, "irogers@...gle.com" <irogers@...gle.com>,
	"Hunter, Adrian" <adrian.hunter@...el.com>
CC: "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
	"ravi.bangoria@....com" <ravi.bangoria@....com>, "ananth.narayan@....com"
	<ananth.narayan@....com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "gautham.shenoy@....com"
	<gautham.shenoy@....com>, "kprateek.nayak@....com" <kprateek.nayak@....com>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v6 05/10] perf/x86/rapl: Make rapl_model struct global

On Fri, 2024-10-25 at 11:13 +0000, Dhananjay Ugwekar wrote:
> Prepare for the addition of RAPL core energy counter support.
> 
> As there will always be just one rapl_model variable on a system,
> make it
> global, to make it easier to access it from any function.
> 
> No functional change.
> 
> Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>

Reviewed-by: Zhang Rui <rui.zhang@...el.com>
Tested-by: Zhang Rui <rui.zhang@...el.com>

thanks,
rui

> ---
>  arch/x86/events/rapl.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
> index 7387bca95018..447f62caa5f9 100644
> --- a/arch/x86/events/rapl.c
> +++ b/arch/x86/events/rapl.c
> @@ -151,6 +151,7 @@ static struct rapl_pmus *rapl_pmus;
>  static unsigned int rapl_cntr_mask;
>  static u64 rapl_timer_ms;
>  static struct perf_msr *rapl_msrs;
> +static struct rapl_model *rapl_model;
>  
>  /*
>   * Helper function to get the correct topology id according to the
> @@ -536,18 +537,18 @@ static struct perf_msr amd_rapl_msrs[] = {
>         [PERF_RAPL_PSYS] = { 0, &rapl_events_psys_group,  NULL,
> false, 0 },
>  };
>  
> -static int rapl_check_hw_unit(struct rapl_model *rm)
> +static int rapl_check_hw_unit(void)
>  {
>         u64 msr_rapl_power_unit_bits;
>         int i;
>  
>         /* protect rdmsrl() to handle virtualization */
> -       if (rdmsrl_safe(rm->msr_power_unit,
> &msr_rapl_power_unit_bits))
> +       if (rdmsrl_safe(rapl_model->msr_power_unit,
> &msr_rapl_power_unit_bits))
>                 return -1;
>         for (i = 0; i < NR_RAPL_DOMAINS; i++)
>                 rapl_hw_unit[i] = (msr_rapl_power_unit_bits >> 8) &
> 0x1FULL;
>  
> -       switch (rm->unit_quirk) {
> +       switch (rapl_model->unit_quirk) {
>         /*
>          * DRAM domain on HSW server and KNL has fixed energy unit
> which can be
>          * different than the unit from power unit MSR. See
> @@ -792,21 +793,20 @@ MODULE_DEVICE_TABLE(x86cpu, rapl_model_match);
>  static int __init rapl_pmu_init(void)
>  {
>         const struct x86_cpu_id *id;
> -       struct rapl_model *rm;
>         int ret;
>  
>         id = x86_match_cpu(rapl_model_match);
>         if (!id)
>                 return -ENODEV;
>  
> -       rm = (struct rapl_model *) id->driver_data;
> +       rapl_model = (struct rapl_model *) id->driver_data;
>  
> -       rapl_msrs = rm->rapl_msrs;
> +       rapl_msrs = rapl_model->rapl_msrs;
>  
>         rapl_cntr_mask = perf_msr_probe(rapl_msrs, PERF_RAPL_MAX,
> -                                       false, (void *) &rm->events);
> +                                       false, (void *) &rapl_model-
> >events);
>  
> -       ret = rapl_check_hw_unit(rm);
> +       ret = rapl_check_hw_unit();
>         if (ret)
>                 return ret;
>