linux-kernel - Re: [PATCH v5 02/22] x86/msr: add AMD CPPC MSR definitions

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Date:   Thu, 16 Dec 2021 18:23:22 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Huang Rui <ray.huang@....com>
Cc:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        Linux PM <linux-pm@...r.kernel.org>,
        Deepak Sharma <deepak.sharma@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Steven Noonan <steven@...vesoftware.com>,
        Nathan Fontenot <nathan.fontenot@....com>,
        Jinzhou Su <Jinzhou.Su@....com>,
        Xiaojian Du <Xiaojian.Du@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [PATCH v5 02/22] x86/msr: add AMD CPPC MSR definitions

On Tue, Nov 30, 2021 at 1:37 PM Huang Rui <ray.huang@....com> wrote:
>
> AMD CPPC (Collaborative Processor Performance Control) function uses MSR
> registers to manage the performance hints. So add the MSR register macro
> here.
>
> Signed-off-by: Huang Rui <ray.huang@....com>

I guess I can take this one if there are no objections from the x86
maintainers, but it would be nice to receive an ACK from one of them.

> ---
>  arch/x86/include/asm/msr-index.h | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
> index 01e2650b9585..e7945ef6a8df 100644
> --- a/arch/x86/include/asm/msr-index.h
> +++ b/arch/x86/include/asm/msr-index.h
> @@ -486,6 +486,23 @@
>
>  #define MSR_AMD64_VIRT_SPEC_CTRL       0xc001011f
>
> +/* AMD Collaborative Processor Performance Control MSRs */
> +#define MSR_AMD_CPPC_CAP1              0xc00102b0
> +#define MSR_AMD_CPPC_ENABLE            0xc00102b1
> +#define MSR_AMD_CPPC_CAP2              0xc00102b2
> +#define MSR_AMD_CPPC_REQ               0xc00102b3
> +#define MSR_AMD_CPPC_STATUS            0xc00102b4
> +
> +#define CAP1_LOWEST_PERF(x)    (((x) >> 0) & 0xff)
> +#define CAP1_LOWNONLIN_PERF(x) (((x) >> 8) & 0xff)
> +#define CAP1_NOMINAL_PERF(x)   (((x) >> 16) & 0xff)
> +#define CAP1_HIGHEST_PERF(x)   (((x) >> 24) & 0xff)
> +
> +#define REQ_MAX_PERF(x)                (((x) & 0xff) << 0)
> +#define REQ_MIN_PERF(x)                (((x) & 0xff) << 8)
> +#define REQ_DES_PERF(x)                (((x) & 0xff) << 16)
> +#define REQ_ENERGY_PERF_PREF(x)        (((x) & 0xff) << 24)
> +
>  /* Fam 17h MSRs */
>  #define MSR_F17H_IRPERF                        0xc00000e9
>
> --
> 2.25.1
>