Re: libdrm amdgpu semaphores questions

[zhoucm1 <david1.zhou-5C7GfCeVMHo@public.gmane.org>]

Yes, the old implementation which is already in upstream libdrm is out 
of data, there isn't other user, so we want to drop it when new 
semaphore is verified OK.

Thanks,
David Zhou

On 2016年12月01日 10:36, Mao, David wrote:
> 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@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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