libdrm amdgpu semaphores questions

[Mao, David]

Hi Dave,
i believe your first attempt is correct.
The export/import semaphore needs refine of the semaphore implementation. 
We are working on that. 

Thanks. 
Best Regards,
David
> On 1 Dec 2016, at 10:12 AM, Dave Airlie <airlied at gmail.com> wrote:
> 
> Hey all,
> 
> So I've started adding semaphore support to radv but I'm not really
> sure what the API to the semaphore code is.
> 
> the Vulkan API is you get a command submission of a number of submit
> units which have a 0-n wait semaphore, 0-n command buffers and 0-n
> signal semaphores.
> 
> Now I'm not sure how I should use the APIs with those.
> 
> My first attempt is
> 
> call amdgpu_cs_wait_semaphore on all the wait ones, call the cs submit
> API, then call the amdgpu_cs_signal_semaphore on all the signal ones?
> 
> or should I be up front calling wait/signal then submitting the command streams?
> 
> Also upcoming work requires possibly sharing semaphores between
> processes, is there any indication how this might be made work with
> the libdrm_amdgpu semaphore implementation?
> 
> Thanks,
> Dave.
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