linux-kernel - Re: [RFC 1/3] PM: Add a sysfs file to represent whether hardware reached the deepest state

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Date:   Tue, 1 Nov 2022 13:37:26 -0400
From:   Sven van Ashbrook <svenva@...omium.org>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     Rafael J Wysocki <rafael@...nel.org>, Pavel Machek <pavel@....cz>,
        Len Brown <len.brown@...el.com>,
        Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
        S-k Shyam-sundar <Shyam-sundar.S-k@....com>,
        rrangel@...omium.org, platform-driver-x86@...r.kernel.org,
        Rajat Jain <rajatja@...gle.com>,
        David E Box <david.e.box@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [RFC 1/3] PM: Add a sysfs file to represent whether hardware
 reached the deepest state

On Mon, Oct 31, 2022 at 4:43 PM Mario Limonciello
<mario.limonciello@....com> wrote:
>
> +void pm_set_hw_deepest_state(u64 duration)
> +{
> +       suspend_stats.last_hw_deepest_state = duration;

I'm wondering if we could add a userspace notification here. Then
userspace wouldn't have to synchronize with the suspend/resume state
of the system when reading this entry.

What about sysfs_notify() ? Or via udev?

> +}
> +EXPORT_SYMBOL_GPL(pm_set_hw_deepest_state);