[PATCH libdrm] libdrm_amdgpu: add kernel semaphore support

[zhoucm1]

On 2017年07月18日 01:35, Christian König wrote:
> Am 17.07.2017 um 19:22 schrieb 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?
>
> Yeah, exactly that was my thinking as well.
Just one thought, Could we remove and not use bo list at all? Instead, 
we expose api like amdgpu_bo_make_resident with proper privilege to user 
mode? That way, we will obviously short CS ioctl.

David Zhou
>
> Christian.
>
>> Marek
>
>
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