linux-kernel - Re: [PATCH v3 0/3] driver core: Add device link related sysfs files

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Date:   Fri, 29 May 2020 14:30:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH v3 0/3] driver core: Add device link related sysfs files

On Thu, May 28, 2020 at 02:18:23PM -0700, Saravana Kannan wrote:
> On Thu, May 21, 2020 at 12:18 PM Saravana Kannan <saravanak@...gle.com> wrote:
> >
> > With fw_devlink and with sync_state() callback features, there's a lot
> > of device/device link related information that's not available in sysfs.
> >
> > Exposing these details to user space can be very useful in understanding
> > suspend/resume issues, runtime pm issues, probing issues, figuring out
> > the modules that'd be needed for first stage init, etc. In fact, an
> > earlier verion of this series was very helpful in debugging and
> > validating the recent memory leak fix[1].
> >
> > This series is based on driver-core-next and [1] cherry-picked on top of
> > it.
> >
> > [1] - https://lore.kernel.org/lkml/20200519063000.128819-1-saravanak@google.com/
> >
> > v1->v2:
> > Patch 1/4
> > - New patch
> > Patch 2/4
> > - Fixed the warnings I saw before that were related to incorrect
> >   sysfs removal code when a device link is deleted.
> > - Fixed error handling in device_link_add()
> > - Split up flags into more meaningful files.
> > - Added status file.
> > Patch 3/4
> > - Fixed error handling that Greg pointed out before.
> > Patch 4/4
> > - New patch
> >
> > v2->v3:
> > - Dropped patch 1/4 from v2 since it was already picked up. So numbering
> >   has shifted.
> > Patch 1/3
> > - Added documentation
> >
> > Saravana Kannan (3):
> >   driver core: Expose device link details in sysfs
> >   driver core: Add state_synced sysfs file for devices that support it
> >   driver core: Add waiting_for_supplier sysfs file for devices
> >
> >  Documentation/ABI/testing/sysfs-class-devlink | 126 ++++++++++
> >  .../ABI/testing/sysfs-devices-consumer        |   8 +
> >  .../ABI/testing/sysfs-devices-state_synced    |  24 ++
> >  .../ABI/testing/sysfs-devices-supplier        |   8 +
> >  .../sysfs-devices-waiting_for_supplier        |  17 ++
> >  drivers/base/core.c                           | 237 +++++++++++++++++-
> >  drivers/base/dd.c                             |  22 ++
> >  include/linux/device.h                        |  58 ++---
> >  8 files changed, 464 insertions(+), 36 deletions(-)
> >  create mode 100644 Documentation/ABI/testing/sysfs-class-devlink
> >  create mode 100644 Documentation/ABI/testing/sysfs-devices-consumer
> >  create mode 100644 Documentation/ABI/testing/sysfs-devices-state_synced
> >  create mode 100644 Documentation/ABI/testing/sysfs-devices-supplier
> >  create mode 100644 Documentation/ABI/testing/sysfs-devices-waiting_for_supplier
> 
> Friendly reminder.

Looks semi-sane, but it's too close to the merge window at the moment
for me to take this.  If there's no objections by the time 5.8-rc1 is
out, I'll queue it up in my tree for 5.9-rc1.

thanks,

greg k-h