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

[Zhi Wang]

Can we directly use DRM_DEBUG_KMS() for this periodic error message?

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,
>