linux-kernel - Re: [PATCH v9 0/4] Add vendor agnostic mechanism to report hardware sleep

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Date:   Mon, 17 Apr 2023 10:24:52 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Mario Limonciello <mario.limonciello@....com>,
        Box David E <david.e.box@...el.com>, jstultz@...gle.com,
        pavel@....cz, svenva@...omium.org,
        platform-driver-x86@...r.kernel.org, linux-pm@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Shyam-sundar.S-k@....com, rrangel@...omium.org,
        Jain Rajat <rajatja@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 0/4] Add vendor agnostic mechanism to report hardware
 sleep

Hi Mario, et al.,

On 4/14/23 03:23, Mario Limonciello wrote:
> An important part of validating that s0ix worked properly is to check how
> much of a cycle was spent in a hardware sleep state.
> 
> The reporting of hardware sleep is a mix of kernel messages and sysfs
> files that vary from vendor to vendor. Collecting this information
> requires extra information on the kernel command line or fetching from
> debugfs.
> 
> To make this information more readily accessible introduce a new file in
> suspend_stats that drivers can report into during their resume routine.
> 
> Userspace can fetch this information and compare it against the duration
> of the cycle to allow determining residency percentages and flagging
> problems.
> 
> Mario Limonciello (4):
>   PM: Add sysfs files to represent time spent in hardware sleep state
>   platform/x86/amd: pmc: Report duration of time in hw sleep state
>   platform/x86/intel/pmc: core: Always capture counters on suspend
>   platform/x86/intel/pmc: core: Report duration of time in HW sleep
>     state
> 
>  Documentation/ABI/testing/sysfs-power | 29 +++++++++++++
>  drivers/platform/x86/amd/pmc.c        |  6 +--
>  drivers/platform/x86/intel/pmc/core.c | 17 ++++----
>  drivers/platform/x86/intel/pmc/core.h |  4 +-
>  include/linux/suspend.h               |  8 ++++
>  kernel/power/main.c                   | 59 +++++++++++++++++++++------
>  6 files changed, 98 insertions(+), 25 deletions(-)
> 
> 
> base-commit: 09a9639e56c01c7a00d6c0ca63f4c7c41abe075d

Thank you for working on this, this looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

For the series. Since this also touches kernel/power/main.c
I think it would be best if the entire series is merged
through the linux-pm tree and I'm fine with the pdx86 bits
also getting merged through linux-pm.

Rafael ?

Regards,

Hans