[Mesa-dev] [PATCH v1 0/7] Implement commont gralloc_handle_t in libdrm

[Tomasz Figa]

On Fri, Mar 23, 2018 at 11:43 AM, Chih-Wei Huang <cwhuang at linux.org.tw> wrote:
> 2018-03-22 16:23 GMT+08:00 Tomasz Figa <tfiga at chromium.org>:
>> Hi Chih-Wei,
>>
>> On Thu, Feb 22, 2018 at 2:53 PM, Chih-Wei Huang <cwhuang at linux.org.tw> wrote:
>>> 2018-02-21 3:03 GMT+08:00 Rob Herring <robh at kernel.org>:
>>>>
>>>> Perhaps worth revisiting. Given we've failed to progress at all since
>>>> then may change opinions some. We already have to handle multiple
>>>> opens share the same pipe_screen, so I don't think reusing the fd buys
>>>> us anything.
>>>>
>>>> Maybe we're close to the point of removing the flink name support too.
>>>> The android-x86 folks have been working to get dma-bufs working.
>>>> Chih-Wei, any comments on this?
>>>
>>> Ah! Sorry. I didn't catch or understand the details.
>>> Did you mean the attempts to use drm_hwcomposer
>>> in android-x86?
>>> My understanding so far is most x86 GPUs won't work
>>> except some very limited models.
>>> It's due to kernel driver issues which may never be solved.
>>> So we can't drop the flink name support.
>>> Please correct me if I am wrong.
>>
>> Could you elaborate a bit more on those GPUs that won't work and
>> corresponding driver issues? We're running cros_gralloc on Intel and
>> AMD GPUs, with DMA-buf and render-node only setup and we haven't seen
>> any problems.
>
> Hi Tomasz,
> I remember (in our previous discussion) you said
> CrOS uses your own hwcomposer (proprietary?) so
> the story may be different.
>
> What we have tried is gbm_gralloc + drm_hwcomposer
> and I reported the issues here:
> https://lists.freedesktop.org/archives/dri-devel/2017-September/153580.html
>
> Sorry I didn't make more tests recently.
> I CC Mauro to comment. He should have made more tests
> with newer kernel and mesa.

Thanks for clarification.

This sounds like something that could be fixed by making sure DMA-buf
support is properly implemented in gralloc and hwcomposer used by
android-x86. I can help figuring this out, if anyone would be
interested in driving this on your side. FYI, I'm UTC+9 time zone, so
based on .tw domain in your email, it should be possible for us to
communicate easily, for example by IRC.

If i915 DRI driver is also needed, it would need wiring support for
DMA-buf as well, but it shouldn't be too hard as mentioned earlier

Best regards,
Tomasz