[Intel-gfx] [PATCH 8/8] drm/i915: Pimp the FBC debugfs output

[Jani Nikula]

On Wed, 14 Apr 2021, Ville Syrjala <ville.syrjala at linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Now that each pipe tracks its own no_fbc_reason we can print that
> out in debugfs, and we can also show which pipe is currently
> selected for FBC duty.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  .../drm/i915/display/intel_display_debugfs.c  | 50 +++++++++++++------
>  1 file changed, 36 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> index 183c414d554a..26317e66cb95 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> @@ -38,15 +38,36 @@ static int i915_frontbuffer_tracking(struct seq_file *m, void *unused)
>  	return 0;
>  }
>  
> +static bool i915_fbc_is_compressing(struct drm_i915_private *dev_priv)
> +{
> +	if (!intel_fbc_is_active(dev_priv))
> +		return false;
> +
> +	if (DISPLAY_VER(dev_priv) >= 8)
> +		return intel_de_read(dev_priv, IVB_FBC_STATUS2) & BDW_FBC_COMP_SEG_MASK;
> +	else if (DISPLAY_VER(dev_priv) >= 7)
> +		return intel_de_read(dev_priv, IVB_FBC_STATUS2) & IVB_FBC_COMP_SEG_MASK;
> +	else if (DISPLAY_VER(dev_priv) >= 5)
> +		return intel_de_read(dev_priv, ILK_DPFC_STATUS) & ILK_DPFC_COMP_SEG_MASK;
> +	else if (IS_G4X(dev_priv))
> +		return intel_de_read(dev_priv, DPFC_STATUS) & DPFC_COMP_SEG_MASK;
> +	else
> +		return intel_de_read(dev_priv, FBC_STATUS) &
> +			(FBC_STAT_COMPRESSING | FBC_STAT_COMPRESSED);
> +}

I wouldn't mind moving debugfs helpers like this to files by feature,
e.g. intel_fbc.[ch] in this case. This one could just return bool like
here; in some cases I'm starting to think passing struct seq_file * and
having the helper print there would make sense.

BR,
Jani.


> +
>  static int i915_fbc_status(struct seq_file *m, void *unused)
>  {
>  	struct drm_i915_private *dev_priv = node_to_i915(m->private);
>  	struct intel_fbc *fbc = &dev_priv->fbc;
> +	struct intel_crtc *crtc;
>  	intel_wakeref_t wakeref;
>  
>  	if (!HAS_FBC(dev_priv))
>  		return -ENODEV;
>  
> +	drm_modeset_lock_all(&dev_priv->drm);
> +
>  	wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
>  	mutex_lock(&fbc->lock);
>  
> @@ -55,27 +76,28 @@ static int i915_fbc_status(struct seq_file *m, void *unused)
>  	else
>  		seq_printf(m, "FBC disabled: %s\n", fbc->no_fbc_reason);
>  
> -	if (intel_fbc_is_active(dev_priv)) {
> -		u32 mask;
> +	seq_printf(m, "Compressing: %s\n", yesno(i915_fbc_is_compressing(dev_priv)));
>  
> -		if (DISPLAY_VER(dev_priv) >= 8)
> -			mask = intel_de_read(dev_priv, IVB_FBC_STATUS2) & BDW_FBC_COMP_SEG_MASK;
> -		else if (DISPLAY_VER(dev_priv) >= 7)
> -			mask = intel_de_read(dev_priv, IVB_FBC_STATUS2) & IVB_FBC_COMP_SEG_MASK;
> -		else if (DISPLAY_VER(dev_priv) >= 5)
> -			mask = intel_de_read(dev_priv, ILK_DPFC_STATUS) & ILK_DPFC_COMP_SEG_MASK;
> -		else if (IS_G4X(dev_priv))
> -			mask = intel_de_read(dev_priv, DPFC_STATUS) & DPFC_COMP_SEG_MASK;
> -		else
> -			mask = intel_de_read(dev_priv, FBC_STATUS) &
> -				(FBC_STAT_COMPRESSING | FBC_STAT_COMPRESSED);
> +	for_each_intel_crtc(&dev_priv->drm, crtc) {
> +		struct intel_plane *plane = to_intel_plane(crtc->base.primary);
> +		const struct intel_crtc_state *crtc_state =
> +			to_intel_crtc_state(crtc->base.state);
>  
> -		seq_printf(m, "Compressing: %s\n", yesno(mask));
> +		if (!plane->has_fbc)
> +			continue;
> +
> +		seq_printf(m, "%c [CRTC:%d:%s]/[PLANE:%d:%s]: %s\n",
> +			   fbc->crtc == crtc ? '*' : ' ',
> +			   crtc->base.base.id, crtc->base.name,
> +			   plane->base.base.id, plane->base.name,
> +			   crtc_state->no_fbc_reason ?: "FBC possible");
>  	}
>  
>  	mutex_unlock(&fbc->lock);
>  	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
>  
> +	drm_modeset_unlock_all(&dev_priv->drm);
> +
>  	return 0;
>  }

-- 
Jani Nikula, Intel Open Source Graphics Center