[PATCH libdrm] libdrm_amdgpu: add kernel semaphore support

[Marek Olšák]

On Sun, Jul 16, 2017 at 11:36 PM, Dave Airlie <airlied at gmail.com> wrote:
>>
>> I can take a look at it, I just won't have time until next week most likely.
>
> I've taken a look, and it's seemingly more complicated than I'm
> expecting I'd want to land in Mesa before 17.2 ships, I'd really
> prefer to just push the new libdrm_amdgpu api from this patch. If I
> have to port all the current radv code to the new API, I'll most
> definitely get something wrong.
>
> Adding the new API so far looks like
> https://cgit.freedesktop.org/~airlied/drm/log/?h=drm-amdgpu-cs-submit-raw
>
> https://cgit.freedesktop.org/~airlied/drm/commit/?h=drm-amdgpu-cs-submit-raw&id=e7f85d0ca617fa41e72624780c9035df132e23c4
> being the API, and whether it should take a uint32_t context id or
> context handle left as an open question in the last patch in the
> series.
>
> However to hook this into radv or radeonsi will take a bit of
> rewriting of a lot of code that is probably a bit more fragile than
> I'd like for this sort of surgery at this point.
>
> I'd actually suspect if we do want to proceed with this type of
> interface, we might be better doing it all in common mesa code, and
> maybe bypassing libdrm_amdgpu altogether, which I suppose the API I've
> written here is mostly already doing.

Well, we plan to stop using the BO list ioctl. The interface has
bo_list_handle in it. Will we just set it to 0 when add the chunk for
the inlined buffer list i.e. what radeon has?

Marek