linux-kernel - Re: [PATCH v2 06/10] drm/i915/gen9: Add ddb changes to atomic debug output

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Date:   Thu, 13 Oct 2016 17:17:36 -0300
From:   Paulo Zanoni <paulo.r.zanoni@...el.com>
To:     Lyude <cpaul@...hat.com>, intel-gfx@...ts.freedesktop.org
Cc:     Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/10] drm/i915/gen9: Add ddb changes to atomic debug
 output

Em Sex, 2016-10-07 às 20:11 -0400, Lyude escreveu:
> Finally, add some debugging output for ddb changes in the atomic
> debug
> output. This makes it a lot easier to spot bugs from incorrect ddb
> allocations.
> 
> Signed-off-by: Lyude <cpaul@...hat.com>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Cc: Paulo Zanoni <paulo.r.zanoni@...el.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 57
> +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c
> b/drivers/gpu/drm/i915/intel_pm.c
> index 5cb537c..9e53ff7 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4040,6 +4040,61 @@ skl_copy_wm_for_pipe(struct skl_wm_values
> *dst,
>  	       sizeof(dst->ddb.plane[pipe]));
>  }
>  
> +static void
> +skl_print_wm_changes(const struct drm_atomic_state *state)
> +{
> +	const struct drm_device *dev = state->dev;
> +	const struct drm_i915_private *dev_priv = to_i915(dev);
> +	const struct intel_atomic_state *intel_state =
> +		to_intel_atomic_state(state);
> +	const struct drm_crtc *crtc;
> +	const struct drm_crtc_state *cstate;
> +	const struct drm_plane *plane;
> +	const struct intel_plane *intel_plane;
> +	const struct drm_plane_state *pstate;
> +	const struct skl_ddb_allocation *old_ddb = &dev_priv-
> >wm.skl_hw.ddb;
> +	const struct skl_ddb_allocation *new_ddb = &intel_state-
> >wm_results.ddb;
> +	enum pipe pipe;
> +	int id;
> +	int i, j;
> +
> +	for_each_crtc_in_state(state, crtc, cstate, i) {
> +		if (!crtc->state)
> +			continue;

Why exactly do we have this check?

Everything else looks good. So with either an explanation or the check
removed in case it's not needed:
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@...el.com>

> +
> +		pipe = to_intel_crtc(crtc)->pipe;
> +
> +		for_each_plane_in_state(state, plane, pstate, j) {
> +			const struct skl_ddb_entry *old, *new;
> +
> +			intel_plane = to_intel_plane(plane);
> +			id = skl_wm_plane_id(intel_plane);
> +			old = &old_ddb->plane[pipe][id];
> +			new = &new_ddb->plane[pipe][id];
> +
> +			if (intel_plane->pipe != pipe)
> +				continue;
> +
> +			if (skl_ddb_entry_equal(old, new))
> +				continue;
> +
> +			if (id != PLANE_CURSOR) {
> +				DRM_DEBUG_ATOMIC("[PLANE:%d:plane
> %d%c] ddb (%d - %d) -> (%d - %d)\n",
> +						 plane->base.id, id
> + 1,
> +						 pipe_name(pipe),
> +						 old->start, old-
> >end,
> +						 new->start, new-
> >end);
> +			} else {
> +				DRM_DEBUG_ATOMIC("[PLANE:%d:cursor
> %c] ddb (%d - %d) -> (%d - %d)\n",
> +						 plane->base.id,
> +						 pipe_name(pipe),
> +						 old->start, old-
> >end,
> +						 new->start, new-
> >end);
> +			}
> +		}
> +	}
> +}
> +
>  static int
>  skl_compute_wm(struct drm_atomic_state *state)
>  {
> @@ -4101,6 +4156,8 @@ skl_compute_wm(struct drm_atomic_state *state)
>  		intel_cstate->update_wm_pre = true;
>  	}
>  
> +	skl_print_wm_changes(state);
> +
>  	return 0;
>  }
>