[Intel-gfx] [PATCH] drm/i915/display: Warn if the FBC is still writing to stolen on removal

[Ville Syrjälä]

On Sun, May 03, 2020 at 07:00:34PM +0100, Chris Wilson wrote:
> If the FBC is still writing into stolen, it will overwrite any future
> users of that stolen region. Check before release.
> 
> References: https://gitlab.freedesktop.org/drm/intel/-/issues/1635
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>  drivers/gpu/drm/i915/display/intel_fbc.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> index c6afa10e814c..37244ed92ae4 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> @@ -540,6 +540,9 @@ static void __intel_fbc_cleanup_cfb(struct drm_i915_private *dev_priv)
>  {
>  	struct intel_fbc *fbc = &dev_priv->fbc;
>  
> +	if (WARN_ON(intel_fbc_hw_is_active(dev_priv)))
> +		return;
> +

Can't immediately see how that would hapoen, but no harm in checking.

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

>  	if (!drm_mm_node_allocated(&fbc->compressed_fb))
>  		return;
>  
> -- 
> 2.20.1
> 
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-- 
Ville Syrjälä
Intel