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

[Chih-Wei Huang]

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.