linux-kernel - Re: [PATCH v4 1/1] x86/acpi, x86/boot: Add multiprocessor wake-up support

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Date:   Fri, 21 May 2021 07:18:41 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Rafael J Wysocki <rjw@...ysocki.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v4 1/1] x86/acpi, x86/boot: Add multiprocessor wake-up
 support

Hi Rafael,

On 5/13/21 2:37 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>
> Signed-off-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@...ux.intel.com>
> Reviewed-by: Andi Kleen<ak@...ux.intel.com>
> ---

Any comments on this patch?

> 
> 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.
> 
>   arch/x86/include/asm/apic.h |  3 ++
>   arch/x86/kernel/acpi/boot.c | 95 +++++++++++++++++++++++++++++++++++++
>   arch/x86/kernel/apic/apic.c |  8 ++++
>   3 files changed, 106 insertions(+)

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer