linux-kernel - Re: [PATCH] powercap: RAPL: fix invalid initialization for pl4

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Date:   Mon, 12 Jun 2023 19:46:46 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>
Cc:     rafael@...nel.org, srinivas.pandruvada@...ux.intel.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        rui.zhang@...el.com, Dave Hansen <dave.hansen@...ux.intel.com>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [PATCH] powercap: RAPL: fix invalid initialization for
 pl4_supported field

+Dave and the x86 maintainers

On Thu, Jun 8, 2023 at 4:44 AM Sumeet Pawnikar
<sumeet.r.pawnikar@...el.com> wrote:
>
> The current initialization of the struct x86_cpu_id via
> pl4_support_ids[] is partial and wrong. It is initializing
> "stepping" field with "X86_FEATURE_ANY" instead of "feature" field.
>
> Use X86_MATCH_INTEL_FAM6_MODEL macro instead of initializing
> each field of the struct x86_cpu_id for pl4_supported list of CPUs.
> This X86_MATCH_INTEL_FAM6_MODEL macro internally uses another macro
> X86_MATCH_VENDOR_FAM_MODEL_FEATURE for X86 based CPU matching with
> appropriate initialized values.
>
> Reported-by: Dave Hansen <dave.hansen@...el.com>
> Closes: https://lore.kernel.org/lkml/28ead36b-2d9e-1a36-6f4e-04684e420260@intel.com/
> Fixes: eb52bc2ae5b8 ("powercap: RAPL: Add Power Limit4 support for Meteor Lake SoC")
> Fixes: b08b95cf30f5 ("powercap: RAPL: Add Power Limit4 support for Alder Lake-N and Raptor Lake-P")
> Fixes: 515755906921 ("powercap: RAPL: Add Power Limit4 support for RaptorLake")
> Fixes: 1cc5b9a411e4 ("powercap: Add Power Limit4 support for Alder Lake SoC")
> Fixes: 8365a898fe53 ("powercap: Add Power Limit4 support")
> Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>
> ---
>  drivers/powercap/intel_rapl_msr.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/powercap/intel_rapl_msr.c b/drivers/powercap/intel_rapl_msr.c
> index a27673706c3d..7be7561f5ad6 100644
> --- a/drivers/powercap/intel_rapl_msr.c
> +++ b/drivers/powercap/intel_rapl_msr.c
> @@ -137,14 +137,14 @@ static int rapl_msr_write_raw(int cpu, struct reg_action *ra)
>
>  /* List of verified CPUs. */
>  static const struct x86_cpu_id pl4_support_ids[] = {
> -       { X86_VENDOR_INTEL, 6, INTEL_FAM6_TIGERLAKE_L, X86_FEATURE_ANY },
> -       { X86_VENDOR_INTEL, 6, INTEL_FAM6_ALDERLAKE, X86_FEATURE_ANY },
> -       { X86_VENDOR_INTEL, 6, INTEL_FAM6_ALDERLAKE_L, X86_FEATURE_ANY },
> -       { X86_VENDOR_INTEL, 6, INTEL_FAM6_ALDERLAKE_N, X86_FEATURE_ANY },
> -       { X86_VENDOR_INTEL, 6, INTEL_FAM6_RAPTORLAKE, X86_FEATURE_ANY },
> -       { X86_VENDOR_INTEL, 6, INTEL_FAM6_RAPTORLAKE_P, X86_FEATURE_ANY },
> -       { X86_VENDOR_INTEL, 6, INTEL_FAM6_METEORLAKE, X86_FEATURE_ANY },
> -       { X86_VENDOR_INTEL, 6, INTEL_FAM6_METEORLAKE_L, X86_FEATURE_ANY },
> +       X86_MATCH_INTEL_FAM6_MODEL(TIGERLAKE_L, NULL),
> +       X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE, NULL),
> +       X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L, NULL),
> +       X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_N, NULL),
> +       X86_MATCH_INTEL_FAM6_MODEL(RAPTORLAKE, NULL),
> +       X86_MATCH_INTEL_FAM6_MODEL(RAPTORLAKE_P, NULL),
> +       X86_MATCH_INTEL_FAM6_MODEL(METEORLAKE, NULL),
> +       X86_MATCH_INTEL_FAM6_MODEL(METEORLAKE_L, NULL),
>         {}
>  };
>
> --

Tentatively applied as 6.5 material, thanks!