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

[Jason Ekstrand]

On March 22, 2018 06:07:01 Tapani Pälli <tapani.palli at intel.com> wrote:

On 03/22/2018 01:01 PM, Emil Velikov wrote:
Hi guys,

On 22 March 2018 at 08:23, Tomasz Figa <tfiga at chromium.org> wrote:
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.
May I suggest an alternative to, diving into details of the issues
observed by the Android-x86 team.

Namely: Tomasz, please send a patch ripping all the flink stuff, thus
Chih-Wei and others can test it.

Ideally it'll be a quick and easy "works for me" ;-)

This has been discussed before and IIRC one reason is that i915 does not
have dmabuf implemented.

Or they can just send patches to add dmabuf to i915.  Clearly the kernel 
module supports it and it wouldn't take much to add it to the dri driver.