linux-kernel - Re: [PATCH v5 4/4] platform/x86/intel/pmc: core: Report duration of time in HW sleep state

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Message-ID: <CAJZ5v0jabz27wk-g=iZRSnpUCmWimfjSUZO+iuNeRbuzPxW=DA@mail.gmail.com>
Date:   Fri, 31 Mar 2023 20:05:42 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     Sven van Ashbrook <svenva@...omium.org>,
        John Stultz <jstultz@...gle.com>,
        Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
        David E Box <david.e.box@...el.com>,
        Raul Rangel <rrangel@...omium.org>,
        Rajat Jain <rajatja@...gle.com>,
        S-k Shyam-sundar <Shyam-sundar.S-k@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-pm@...r.kernel.org, Mark Gross <markgross@...nel.org>
Subject: Re: [PATCH v5 4/4] platform/x86/intel/pmc: core: Report duration of
 time in HW sleep state

On Thu, Mar 30, 2023 at 9:45 PM Mario Limonciello
<mario.limonciello@....com> wrote:
>
> intel_pmc_core displays a warning when the module parameter
> `warn_on_s0ix_failures` is set and a suspend didn't get to a HW sleep
> state.
>
> Report this to the standard kernel reporting infrastructure so that
> userspace software can query after the suspend cycle is done.
>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
> v4->v5:
>  * Reword commit message
> ---
>  drivers/platform/x86/intel/pmc/core.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
> index e2f171fac094..980af32dd48a 100644
> --- a/drivers/platform/x86/intel/pmc/core.c
> +++ b/drivers/platform/x86/intel/pmc/core.c
> @@ -1203,6 +1203,8 @@ static inline bool pmc_core_is_s0ix_failed(struct pmc_dev *pmcdev)
>         if (pmc_core_dev_state_get(pmcdev, &s0ix_counter))
>                 return false;
>
> +       pm_set_hw_sleep_time(s0ix_counter - pmcdev->s0ix_counter);
> +

Maybe check if this is really accumulating?  In case of a counter
overflow, for instance?

>         if (s0ix_counter == pmcdev->s0ix_counter)
>                 return true;
>
> --