[Intel-gfx] [PATCH 04/25] drm/vkms: Annotate vblank timer

[Melissa Wen]

On 07/12, Rodrigo Siqueira wrote:
> Hi,
> 
> Everything looks fine to me, I just noticed that the amdgpu patches did
> not apply smoothly, however it was trivial to fix the issues.
> 
> Reviewed-by: Rodrigo Siqueira <rodrigosiqueiramelo at gmail.com>
> 
> Melissa,
> Since you are using vkms regularly, could you test this patch and review
> it? Remember to add your Tested-by when you finish.
>
Hi,

I've applied the patch series, ran some tests on vkms, and found no
issues. I mean, things have remained stable.

Tested-by: Melissa Wen <melissa.srw at gmail.com>

> Thanks
> 
> On 07/07, Daniel Vetter wrote:
> > This is needed to signal the fences from page flips, annotate it
> > accordingly. We need to annotate entire timer callback since if we get
> > stuck anywhere in there, then the timer stops, and hence fences stop.
> > Just annotating the top part that does the vblank handling isn't
> > enough.
> > 
> > Cc: linux-media at vger.kernel.org
> > Cc: linaro-mm-sig at lists.linaro.org
> > Cc: linux-rdma at vger.kernel.org
> > Cc: amd-gfx at lists.freedesktop.org
> > Cc: intel-gfx at lists.freedesktop.org
> > Cc: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> > Cc: Christian König <christian.koenig at amd.com>
> > Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> > Cc: Rodrigo Siqueira <rodrigosiqueiramelo at gmail.com>
> > Cc: Haneen Mohammed <hamohammed.sa at gmail.com>
> > Cc: Daniel Vetter <daniel at ffwll.ch>
> > ---
> >  drivers/gpu/drm/vkms/vkms_crtc.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
> > index ac85e17428f8..a53a40848a72 100644
> > --- a/drivers/gpu/drm/vkms/vkms_crtc.c
> > +++ b/drivers/gpu/drm/vkms/vkms_crtc.c
> > @@ -1,5 +1,7 @@
> >  // SPDX-License-Identifier: GPL-2.0+
> >  
> > +#include <linux/dma-fence.h>
> > +
> >  #include <drm/drm_atomic.h>
> >  #include <drm/drm_atomic_helper.h>
> >  #include <drm/drm_probe_helper.h>
> > @@ -14,7 +16,9 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
> >  	struct drm_crtc *crtc = &output->crtc;
> >  	struct vkms_crtc_state *state;
> >  	u64 ret_overrun;
> > -	bool ret;
> > +	bool ret, fence_cookie;
> > +
> > +	fence_cookie = dma_fence_begin_signalling();
> >  
> >  	ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
> >  					  output->period_ns);
> > @@ -49,6 +53,8 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
> >  			DRM_DEBUG_DRIVER("Composer worker already queued\n");
> >  	}
> >  
> > +	dma_fence_end_signalling(fence_cookie);
> > +
> >  	return HRTIMER_RESTART;
> >  }
> >  
> > -- 
> > 2.27.0
> > 
> 
> -- 
> Rodrigo Siqueira
> https://siqueira.tech