Re: libdrm amdgpu semaphores questions

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

Thanks Dave, got your suggestion.

Regards,
David Zhou

On 2016年12月02日 03:44, Dave Airlie wrote:
> Hi David,
>
> Some one major review suggestion, don't use file descriptors for
> semaphore, as fd's are a limited resource and we don't want to use
> them all up.
>
> You create semaphore objects and use them in a single process without
> them being fds, then when userspace wants to share with another
> process
> you convert the semaphore object to an fd, pass it to the other
> process and have it convert it back into a semaphore object.
>
> Dave.
>
> On 1 December 2016 at 16:11, zhoucm1 <david1.zhou@amd.com> wrote:
>> Hi Dave,
>>
>> As the attached, our Vulkan team is verifying it.
>>
>> Thanks,
>> David Zhou
>>
>>
>> On 2016年12月01日 13:44, Dave Airlie wrote:
>>
>> On 1 Dec. 2016 15:22, "zhoucm1" <david1.zhou@amd.com> wrote:
>>> 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.
>> Could you post some patches for the new one? Otherwise I'll have to write
>> one for radv.
>>
>> Dave.
>>> 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.
>>>>> _______________________________________________
>>>>> amd-gfx mailing list
>>>>> amd-gfx@lists.freedesktop.org
>>>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
>>>> _______________________________________________
>>>> amd-gfx mailing list
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>>>
>>

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