linux-kernel - Re: [RFC 1/3] drm: Add DAMAGE

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Date:   Thu, 5 Apr 2018 13:42:11 +0200
From:   Thomas Hellstrom <thellstrom@...are.com>
To:     Deepak Rawat <drawat@...are.com>, dri-devel@...ts.freedesktop.org,
        syeh@...are.com, linux-graphics-maintainer@...are.com,
        ville.syrjala@...ux.intel.com, lukasz.spintzyk@...playlink.com,
        noralf@...nnes.org, robdclark@...il.com, gustavo@...ovan.org,
        maarten.lankhorst@...ux.intel.com, seanpaul@...omium.org,
        airlied@...ux.ie, linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/3] drm: Add DAMAGE_CLIPS property to plane

On 04/05/2018 12:03 PM, Daniel Vetter wrote:
>
> On the topic of input validation: Should the kernel check in shared code
> that all the clip rects are sensible, i.e. within the dimensions of the
> fb? Relying on drivers for that seems like a bad idea.

I guess we could do that.

There seems to be different needs for different kinds of iterators, but 
otherwise
I was thinking that an iterator could just skip invalid rects if found. 
Then we
don't need a separate validation step, but OTOH user-space won't get 
notified if
that was intended.

I'm not 100% sure user-space would do anything sensible with any error 
information, though.

/Thomas


>
> That could be done in core code in drm_atomic_plane_check().
> -Daniel
>> /Thomas
>>
>>
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