linux-kernel - Re: [PATCH 1/3] powercap: intel_rapl: Use standard Energy Unit for SPR Dram RAPL domain

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Date:   Sat, 24 Sep 2022 19:34:17 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Zhang Rui <rui.zhang@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        linux-perf-users@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Subject: Re: [PATCH 1/3] powercap: intel_rapl: Use standard Energy Unit for
 SPR Dram RAPL domain

On Sat, Sep 24, 2022 at 7:45 AM Zhang Rui <rui.zhang@...el.com> wrote:
>
> Intel Xeon servers used to use a fixed energy resolution (15.3uj) for
> Dram RAPL domain. But on SPR, Dram RAPL domain follows the standard
> energy resolution as described in MSR_RAPL_POWER_UNIT.
>
> Remove the SPR dram_domain_energy_unit quirk.
>
> Fixes: 2d798d9f5967 ("powercap: intel_rapl: add support for Sapphire Rapids")
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> Tested-by: Wang Wendy <wendy.wang@...el.com>
> ---
>  drivers/powercap/intel_rapl_common.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c
> index 949eb90f5733..d8eaa04bf2af 100644
> --- a/drivers/powercap/intel_rapl_common.c
> +++ b/drivers/powercap/intel_rapl_common.c
> @@ -1035,7 +1035,6 @@ static const struct rapl_defaults rapl_defaults_spr_server = {
>         .check_unit = rapl_check_unit_core,
>         .set_floor_freq = set_floor_freq_default,
>         .compute_time_window = rapl_compute_time_window_core,
> -       .dram_domain_energy_unit = 15300,
>         .psys_domain_energy_unit = 1000000000,
>         .spr_psys_bits = true,
>  };
> --

Applied as 6.1 material, thanks!