linux-kernel - Re: [PATCH v7 1/1] x86/acpi, x86/boot: Add multiprocessor wake-up support

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Message-ID: <c881e659-bb31-3d08-d7eb-0b260bb90525@linux.intel.com>
Date:   Tue, 17 Aug 2021 06:55:48 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Rafael J Wysocki <rjw@...ysocki.net>,
        H Peter Anvin <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Len Brown <lenb@...nel.org>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH v7 1/1] x86/acpi, x86/boot: Add multiprocessor wake-up
 support

Hi,

On 7/19/21 9:25 PM, Kuppuswamy Sathyanarayanan wrote:
> As per ACPI specification r6.4, sec 5.2.12.19, a new sub
> structure – multiprocessor wake-up structure - is added to the
> ACPI Multiple APIC Description Table (MADT) to describe the
> information of the mailbox. If a platform firmware produces the
> multiprocessor wake-up structure, then OS may use this new
> mailbox-based mechanism to wake up the APs.
> 
> Add ACPI MADT wake table parsing support for x86 platform and if
> MADT wake table is present, update apic->wakeup_secondary_cpu with
> new API which uses MADT wake mailbox to wake-up CPU.
> 
> Co-developed-by: Sean Christopherson<sean.j.christopherson@...el.com>
> Signed-off-by: Sean Christopherson<sean.j.christopherson@...el.com>
> Reviewed-by: Andi Kleen<ak@...ux.intel.com>
> Reviewed-by: Rafael J. Wysocki<rafael.j.wysocki@...el.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@...ux.intel.com>
> ---
> 
> Changes since v6:
>   * Rebased on top of v5.14-rc1.
> 
> Changes since v5:
>   * None ( CCed ACPI list)
> 
> Changes since v4:
>   * Used smp_store_release() in place of WRITE_ONCE().
>   * Addressed some checkpatch warnings.
> 
> Changes since v3:
>   * Removed acpi_mp_wake_mailbox_init() and moved init code to
>     acpi_wakeup_cpu().
>   * Removed redundant NULL pointer check for acpi_mp_wake_mailbox.
>   * Added comments/debug prints as per Rafael's suggestion.
>   * Removed MADT/SVKL ACPI patches from this patchset. It will be
>     merged via ACPICA submission.


Gentle ping! Any comments on this patch?

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer