linux-kernel - Re: [PATCH v2 2/7] x86: Add definitions for the Intel Hardware Feedback Interface

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Date:   Thu, 30 Dec 2021 19:03:57 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Len Brown <len.brown@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Amit Kucheria <amitk@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Lukasz Luba <lukasz.luba@....com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ricardo Neri <ricardo.neri@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/7] x86: Add definitions for the Intel Hardware
 Feedback Interface

On Mon, Dec 20, 2021 at 4:23 PM Ricardo Neri
<ricardo.neri-calderon@...ux.intel.com> wrote:
>
> Add the CPUID feature bit and the model-specific registers needed to
> identify and configure the Intel Hardware Feedback Interface.
>
> Cc: Andi Kleen <ak@...ux.intel.com>
> Cc: Aubrey Li <aubrey.li@...ux.intel.com>
> Cc: Len Brown <len.brown@...el.com>
> Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Cc: Tim Chen <tim.c.chen@...ux.intel.com>
> Cc: "Ravi V. Shankar" <ravi.v.shankar@...el.com>
> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> ---
> Changes since v1:
>   * Renamed X86_FEATURE_INTEL_HFI as X86_FEATURE_HFI. (Boris)

It would be good to get an ACK from the x86 side for this.

> ---
>  arch/x86/include/asm/cpufeatures.h | 1 +
>  arch/x86/include/asm/msr-index.h   | 6 ++++++
>  2 files changed, 7 insertions(+)
>
> diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
> index d5b5f2ab87a0..1a31b3ef15f0 100644
> --- a/arch/x86/include/asm/cpufeatures.h
> +++ b/arch/x86/include/asm/cpufeatures.h
> @@ -327,6 +327,7 @@
>  #define X86_FEATURE_HWP_ACT_WINDOW     (14*32+ 9) /* HWP Activity Window */
>  #define X86_FEATURE_HWP_EPP            (14*32+10) /* HWP Energy Perf. Preference */
>  #define X86_FEATURE_HWP_PKG_REQ                (14*32+11) /* HWP Package Level Request */
> +#define X86_FEATURE_HFI                        (14*32+19) /* Hardware Feedback Interface */
>
>  /* AMD SVM Feature Identification, CPUID level 0x8000000a (EDX), word 15 */
>  #define X86_FEATURE_NPT                        (15*32+ 0) /* Nested Page Table support */
> diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
> index 01e2650b9585..ad958a49b2bb 100644
> --- a/arch/x86/include/asm/msr-index.h
> +++ b/arch/x86/include/asm/msr-index.h
> @@ -687,12 +687,14 @@
>
>  #define PACKAGE_THERM_STATUS_PROCHOT           (1 << 0)
>  #define PACKAGE_THERM_STATUS_POWER_LIMIT       (1 << 10)
> +#define PACKAGE_THERM_STATUS_HFI_UPDATED       (1 << 26)
>
>  #define MSR_IA32_PACKAGE_THERM_INTERRUPT       0x000001b2
>
>  #define PACKAGE_THERM_INT_HIGH_ENABLE          (1 << 0)
>  #define PACKAGE_THERM_INT_LOW_ENABLE           (1 << 1)
>  #define PACKAGE_THERM_INT_PLN_ENABLE           (1 << 24)
> +#define PACKAGE_THERM_INT_HFI_ENABLE           (1 << 25)
>
>  /* Thermal Thresholds Support */
>  #define THERM_INT_THRESHOLD0_ENABLE    (1 << 15)
> @@ -941,4 +943,8 @@
>  #define MSR_VM_IGNNE                    0xc0010115
>  #define MSR_VM_HSAVE_PA                 0xc0010117
>
> +/* Hardware Feedback Interface */
> +#define MSR_IA32_HW_FEEDBACK_PTR        0x17d0
> +#define MSR_IA32_HW_FEEDBACK_CONFIG     0x17d1
> +
>  #endif /* _ASM_X86_MSR_INDEX_H */
> --
> 2.17.1
>