[Intel-gfx] [PATCH] drm/i915: suppress atomic commit error message under gvt-g env

[Ville Syrjälä]

On Fri, Mar 03, 2017 at 10:56:16AM +0800, Zhi Wang wrote:
> Can we directly use DRM_DEBUG_KMS() for this periodic error message?

No. We want to actually know when/if this fails.

> 
> On 03/03/17 19:53, bing.niu at intel.com wrote:
> > From: Bing Niu <bing.niu at intel.com>
> >
> > under virtualization enviroment, it is possible guest update pipe
> > registers across vblank intervals due to overhead of mmio traps or vm
> > schedule out. However, it is safe since those pipe update happen in
> > virual registers and will not be committed to hardware. suppress that
> > atomic commit error message under virtualization case to avoid
> > confusing user.
> >
> > Signed-off-by: Bing Niu <bing.niu at intel.com>
> > ---
> >   drivers/gpu/drm/i915/intel_sprite.c | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> > index b16a295..5ce1ec6 100644
> > --- a/drivers/gpu/drm/i915/intel_sprite.c
> > +++ b/drivers/gpu/drm/i915/intel_sprite.c
> > @@ -158,6 +158,7 @@ void intel_pipe_update_end(struct intel_crtc *crtc, struct intel_flip_work *work
> >   	int scanline_end = intel_get_crtc_scanline(crtc);
> >   	u32 end_vbl_count = intel_crtc_get_vblank_counter(crtc);
> >   	ktime_t end_vbl_time = ktime_get();
> > +	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> >
> >   	if (work) {
> >   		work->flip_queued_vblank = end_vbl_count;
> > @@ -184,7 +185,7 @@ void intel_pipe_update_end(struct intel_crtc *crtc, struct intel_flip_work *work
> >   	local_irq_enable();
> >
> >   	if (crtc->debug.start_vbl_count &&
> > -	    crtc->debug.start_vbl_count != end_vbl_count) {
> > +	    crtc->debug.start_vbl_count != end_vbl_count && !intel_vgpu_active(dev_priv)) {
> >   		DRM_ERROR("Atomic update failure on pipe %c (start=%u end=%u) time %lld us, min %d, max %d, scanline start %d, end %d\n",
> >   			  pipe_name(pipe), crtc->debug.start_vbl_count,
> >   			  end_vbl_count,
> >
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC