Re: [RFC][PATCH] dma-buf: Introduce dma-buf test module
From: Daniel Vetter
Date: Wed Mar 15 2017 - 06:08:22 EST
On Tue, Mar 14, 2017 at 01:30:30PM -0700, Laura Abbott wrote:
> On 03/14/2017 01:13 PM, Daniel Vetter wrote:
> > On Tue, Mar 14, 2017 at 01:04:19PM -0700, Laura Abbott wrote:
> >>
> >> dma-buf is designed to share buffers. Sharing means that there needs to
> >> be another subsystem to accept those buffers. Introduce a simple test
> >> module to act as a dummy system to accept dma_bufs from elsewhere. The
> >> goal is to provide a very simple interface to validate exported buffers
> >> do something reasonable. This is based on ion_test.c that existed for
> >> the Ion framework.
> >>
> >> Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
> >> ---
> >> This is basically a drop in of what was available as
> >> drivers/staging/android/ion/ion_test.c. Given it has no Ion specific
> >> parts it might be useful as a more general test module. RFC mostly
> >> to see if this is generally useful or not.
> >
> > We already have a test dma-buf driver, which also handles reservation
> > objects and can create fences to provoke signalling races an all kinds of
> > other fun. It's drivers/gpu/drm/vgem.
> >
> > If there's anything missing in there, patches very much welcome.
> > -Daniel
> >
>
> Thanks for that pointer. It certainly looks more complete vs. allocating
> a platform_device. I'll look and see if there's anything that needs
> extension. Plus this means I can probably delete more code from Ion (woo)
\o/ for less code!
btw for the tests, I think we should really hard to either get them into
kselftests or igt.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch