dumb BOs and prime

[Martin Peres]

On 04/12/15 19:49, Rob Herring wrote:
> I'm working on getting Android working with DRM drivers. ATM, I'm
> using virtio-gpu as the driver and trying to get just KMS side working
> without rendering. I have it working with stock AOSP and the emulated
> fb with a few additions to the virtio-gpu driver[1]. Now I'm trying to
> get things working with native KMS using drm_gralloc and
> drm_hwcomposer (now in AOSP). I've hit one problem though which I'm
> not sure how to solve without hacking around it.
>
> Is prime allowed on dumb BOs? AIUI, dumb buffer allocation is not
> allowed on render nodes and drmPrimeHandleToFD is not allowed on
> card0, so I'm stuck. I could open both nodes, but then I want the case
> of no render node to work. After some searching, I thought it was a
> matter of needing to do drmAuthMagic, but then found that is
> considered obsolete[2].

Obsolete when using render nodes, but still necessary on usual nodes 
(/dev/dri/cardX) as far as I remember. The usual nodes can do everything 
the render nodes can do.

Authentication should help! Please make sure you are master or 
authenticated before doing anything on the usual nodes.

>
> Rob
>
> [1] git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git android-4.4
> [2] http://www.x.org/wiki/Events/XDC2013/XDC2013DavidHerrmannDRMSecurity/slides.pdf
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