[PATCH v3 1/3] drm: Introduce device wedged event

[Raag Jadav]

On Mon, Sep 02, 2024 at 02:44:21PM +0530, Aravind Iddamsetty wrote:
> 
> On 02/09/24 13:18, Raag Jadav wrote:
> > Introduce device wedged event, which will notify userspace of wedged
> > (hanged/unusable) state of the DRM device through a uevent. This is
> > useful especially in cases where the device is in unrecoverable state
> > and requires userspace intervention for recovery.
> >
> > Purpose of this implementation is to be vendor agnostic. Userspace
> > consumers (sysadmin) can define udev rules to parse this event and
> > take respective action to recover the device.
> >
> > Consumer expectations:
> > ----------------------
> > 1) Unbind driver
> > 2) Reset bus device
> > 3) Re-bind driver
> >
> > Signed-off-by: Raag Jadav <raag.jadav at intel.com>
> > ---
> >  drivers/gpu/drm/drm_drv.c | 21 +++++++++++++++++++++
> >  include/drm/drm_drv.h     |  1 +
> >  2 files changed, 22 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> > index 93543071a500..dc55cc237d89 100644
> > --- a/drivers/gpu/drm/drm_drv.c
> > +++ b/drivers/gpu/drm/drm_drv.c
> > @@ -499,6 +499,27 @@ void drm_dev_unplug(struct drm_device *dev)
> >  }
> >  EXPORT_SYMBOL(drm_dev_unplug);
> >  
> > +/**
> > + * drm_dev_wedged - declare DRM device as wedged
> > + * @dev: DRM device
> > + *
> > + * This declares a DRM device specified by @dev as wedged (hanged/unusable)
> this doesn't seem to set any drm state as wedged, it is just sending an
> uevent. you might need to correct the above statement.

On a second thought, perhaps this warrants any action on drm_device?

Raag