Re: [drm:i915_gem_object_unbind] *ERROR* Attempting to unbind pinned buffer

On Sun, Aug 30, 2015 at 04:06:04PM +0300, Slawa Olhovchenkov wrote:

> On Sat, Aug 29, 2015 at 11:15:53PM +0300, Ruslan Makhmatkhanov wrote:
> 
> > Hello,
> > 
> > I'm getting tons of this in /var/log/messages:
> > error: [drm:pid9:i915_gem_object_unbind] *ERROR* Attempting to unbind 
> > pinned buffer
> > 
> > As far I understand [1], this case is harmless and there is no point to 
> > print it with DRM_ERROR - DRM_DEBUG is sufficient. Can we please change 
> > it in our tree like it done in patch attached? Thanks.
> > 
> > PS. In Linux 3.8 [2] this check was changed by removing the warning 
> > altogether and just returning -EBUSY, so may be we can do just this to 
> > reduce the diff ;).
> > 
> > [1] https://bugs.freedesktop.org/show_bug.cgi?id=50075
> > [2] 
> > http://lxr.free-electrons.com/source/drivers/gpu/drm/i915/i915_gem.c?v=3.8
> > 
> > -- 
> > Regards,
> > Ruslan
> > 
> > T.O.S. Of Reality
> 
> > Index: sys/dev/drm2/i915/i915_gem.c
> > ===================================================================
> > --- sys/dev/drm2/i915/i915_gem.c	(revision 287214)
> > +++ sys/dev/drm2/i915/i915_gem.c	(working copy)
> > _at__at_ -2528,7 +2528,7 _at__at_
> >  		return 0;
> >  
> >  	if (obj->pin_count) {
> > -		DRM_ERROR("Attempting to unbind pinned buffer\n");
> > +		DRM_DEBUG("Attempting to unbind pinned buffer\n");
> >  		return -EINVAL;
> >  	}
> >  
> 
> I think this is not root of cause, this is only cause of other error:
> 
> === dmesg ====
> info: [drm] Initialized i915 1.6.0 20080730 for drmn0 on minor 0
> error: [drm:pid12:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
> info: [drm] capturing error event; look for more information in sysctl hw.dri.0.info.i915_error_state
> error: [drm:pid0:i915_reset] *ERROR* Failed to reset chip.
> ==============
> 
> This cause:
> 
> === Xorg.log ====
> [    51.010] (EE) intel(0): Detected a hung GPU, disabling acceleration.
> [    51.010] (EE) intel(0): When reporting this, please include i915_error_state from debugfs and the full dmesg.
> =================    
> 
> and after this you see Attempting to unbind pinned buffer.
> 
> I am see this in STABLE after Aug upgrade. I am don't see this at 2014-Oct STABLE.

For -STABLE:

r280368 -- All works OK (no error messages, video playback work)
r280369 -- All works OK (no error messages, video playback work)
r282141 -- error: [drm:pid5:i915_gem_object_unbind] *ERROR* Attempting to unbind pinned buffer (video don't tested)
r282199 -- error: [drm:pid12:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung (video don't work)