Status of rpi work

Eric Anholt eric at
Wed May 13 13:32:19 PDT 2015

Vince Weaver <vincent.weaver at> writes:

> On Mon, 11 May 2015, Eric Anholt wrote:
>> - vc4-kms-v3d: VC4 3D driver implementation on top of vc4-kms, for use
>>   with Mesa master (GLES 2.0 / OpenGL 2.0 support).  Needs rpi-mailbox
>>   to turn on v3d.  The 3D ioctl ABI is definitely not stable, as I need
>>   to do a bunch of performance analysis first.  I won't be able to do
>>   that really until we get a cpufreq driver in, have working perf
>>   support, and hopefuly have bcm2836-smp in as well.
> Just curious, by "working perf support" do you mean perf_event support for 
> the ARM processor, or is there going to be perf_event support for the GPU?
> Or something else entirely?

I've been failing to get callgraphs in sysprof.  It's hard to do good
CPU-side optimization work without it.  (-fomit-frame-pointer is
apparently not the default, so it's not even that that would be the
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