linux-kernel - Re: [PATCH v3 0/4] Add some extra debugging mechanisms for s0i3

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Date:   Fri, 9 Sep 2022 18:01:02 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Mario Limonciello <mario.limonciello@....com>,
        Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     rafael@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/4] Add some extra debugging mechanisms for s0i3

Hi All,

On 8/29/22 18:29, Mario Limonciello wrote:
> Recently there have been reports of problems where the system consumes
> too much power after certain interrupts occur that would notify the
> kernel of some event but those events aren't marked for wakeup.
> 
> These problems have been root caused to the timing of the kernel moving
> the cores into ACPI C3 relative to other events from the previous wakeup
> not being settled.  Linux will more aggressively move the cores into C3
> for s2idle than Windows does for Modern Standby.
> 
> To aide with debugging this class of problems in the future add a new
> set of optional debugging infrastructure.
> 
> Mario Limonciello (4):
>   ACPI: s2idle: Add a new ->check() callback for platform_s2idle_ops
>   platform/x86/amd: pmc: Add defines for STB events
>   platform/x86/amd: pmc: Always write to the STB
>   platform/x86/amd: pmc: Add an extra STB message for checking s2idle
>     entry


Thank you for your patch-series, I've applied the series to my
review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans



> 
>  drivers/acpi/sleep.h           |  1 +
>  drivers/acpi/x86/s2idle.c      | 14 ++++++++++++++
>  drivers/platform/x86/amd/pmc.c | 32 ++++++++++++++++++++------------
>  include/linux/acpi.h           |  1 +
>  include/linux/suspend.h        |  1 +
>  kernel/power/suspend.c         |  3 +++
>  6 files changed, 40 insertions(+), 12 deletions(-)
>