linux-kernel - Re: [PATCH v6] PM / wakeup: show wakeup sources stats in sysfs

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Date:   Thu, 1 Aug 2019 10:09:22 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Tri Vo <trong@...roid.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Hridya Valsaraju <hridya@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Cc: Android Kernel" <kernel-team@...roid.com>
Subject: Re: [PATCH v6] PM / wakeup: show wakeup sources stats in sysfs

On Thu, Aug 1, 2019 at 2:45 AM Stephen Boyd <swboyd@...omium.org> wrote:
>
> Quoting Stephen Boyd (2019-07-31 16:45:31)
> >
> > This approach also nicely detects duplicate wakeup source names in the
> > case that the string passed in to wakeup_source_register() is already
> > used on the virtual bus.
>
> This was clearly untested! Here's a better one. This is what I see on my
> device with this patch squashed in:
>
> localhost ~ # cat /sys/kernel/debug/wakeup_sources
> name            active_count    event_count     wakeup_count    expire_count    active_since    total_time      max_time        last_change  prevent_suspend_time
> 1-1.2.4.1       0               0               0               0               0               0               0               0   0
> 1-1.1           0               0               0               0               0               0               0               0   0
> gpio-keys       0               0               0               0               0               0               0               0   0
> spi10.0         0               0               0               0               0               0               0               0   0
> a88000.spi:ec@0:keyboard-controller     0               0               0               0               0               0           0
>                 0               0
> alarmtimer      0               0               0               0               0               0               0               0   0
> cros-ec-rtc.1.auto      0               0               0               0               0               0               0           0
>                 0
> a8f8800.usb     0               0               0               0               0               0               0               0   0
> a6f8800.usb     0               0               0               0               0               0               0               0   0
> localhost ~ # ls -l /sys/class/wakeup/
> total 0
> lrwxrwxrwx. 1 root root 0 Jul 31 17:43 alarmtimer -> ../../devices/platform/soc/ac0000.geniqup/a88000.spi/spi_master/spi10/spi10.0/cros-ec-dev.0.auto/cros-ec-rtc.1.auto/rtc/rtc0/alarmtimer

So why is this not "(...)rtc0/wakeup/alarmtimer" ?

This particular bit looks kind of inconsistent.

I guess without your patch you'd see "(...)rtc0/wakeup/wakeup0" instead, right?

> lrwxrwxrwx. 1 root root 0 Jul 31 17:43 wakeup0 -> ../../devices/platform/soc/a6f8800.usb/wakeup/wakeup0
> lrwxrwxrwx. 1 root root 0 Jul 31 17:43 wakeup1 -> ../../devices/platform/soc/a8f8800.usb/wakeup/wakeup1
> lrwxrwxrwx. 1 root root 0 Jul 31 17:43 wakeup2 -> ../../devices/platform/soc/ac0000.geniqup/a88000.spi/spi_master/spi10/spi10.0/cros-ec-dev.0.auto/cros-ec-rtc.1.auto/wakeup/wakeup2
> lrwxrwxrwx. 1 root root 0 Jul 31 17:43 wakeup3 -> ../../devices/platform/soc/ac0000.geniqup/a88000.spi/spi_master/spi10/spi10.0/a88000.spi:ec@0:keyboard-controller/wakeup/wakeup3
> lrwxrwxrwx. 1 root root 0 Jul 31 17:43 wakeup4 -> ../../devices/platform/soc/ac0000.geniqup/a88000.spi/spi_master/spi10/spi10.0/wakeup/wakeup4
> lrwxrwxrwx. 1 root root 0 Jul 31 17:43 wakeup5 -> ../../devices/platform/gpio-keys/wakeup/wakeup5
> lrwxrwxrwx. 1 root root 0 Jul 31 17:43 wakeup6 -> ../../devices/platform/soc/a8f8800.usb/a800000.dwc3/xhci-hcd.7.auto/usb1/1-1/1-1.1/wakeup/wakeup6
> lrwxrwxrwx. 1 root root 0 Jul 31 17:43 wakeup7 -> ../../devices/platform/soc/a8f8800.usb/a800000.dwc3/xhci-hcd.7.auto/usb1/1-1/1-1.2/1-1.2.4/1-1.2.4.1/wakeup/wakeup7
>