linux-kernel - Re: [PATCH v10 0/4] Add vendor agnostic mechanism to report hardware sleep

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Message-ID: <CAJZ5v0hBVosNmxN-KFZ0N=syNWNsQKtPOxYbNFy1bjRO2tP05Q@mail.gmail.com>
Date:   Thu, 20 Apr 2023 19:08:22 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        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,
        S-k Shyam-sundar <Shyam-sundar.S-k@....com>,
        rrangel@...omium.org, Jain Rajat <rajatja@...gle.com>,
        hdegoede@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 0/4] Add vendor agnostic mechanism to report hardware sleep

On Mon, Apr 17, 2023 at 5:27 PM Mario Limonciello
<mario.limonciello@....com> 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.
>
> v9->v10:
>  * Add tags
>  * Rebase on linux-pm/bleeding-edge as it will apply through this tree
>
> 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(-)
>

Whole series applied as 6.4-rc1 material, thanks!