Re: [RFC][PATCH 5/5 v2] kselftests: Add dma-heap test

[Laura Abbott]

On 3/6/19 9:01 AM, John Stultz wrote:
> On Wed, Mar 6, 2019 at 8:14 AM Benjamin Gaignard
> <benjamin.gaignard@xxxxxxxxxx> wrote:
> > Le mar. 5 mars 2019 Ã 21:54, John Stultz <john.stultz@xxxxxxxxxx> a Ãcrit :
> > > +
> > > +       printf("Allocating 1 MEG\n");
> > > +       ret = dmabuf_heap_alloc(heap_fd, ONE_MEG, 0, &dmabuf_fd);
> > > +       if (ret)
> > > +               goto out;
> > > +
> > > +       /* DO SOMETHING WITH THE DMABUF HERE? */
> >
> > You can do a call to mmap and write a pattern in the buffer.
>
> Yea. I can also do some invalid allocations to make sure things fail properly.
>
> But I was talking a bit w/ Sumit about the lack of any general dmabuf
> tests, and am curious if we need to have a importer device driver that
> can validate its a real dmabuf and exercise more of the dmabuf ops.
>
> thanks
> -john

There's the vgem driver in drm. I did some work to clean that
up so it could take an import af33a9190d02 ("drm/vgem: Enable dmabuf import
interfaces") . I mostly used it for private tests and never ended
up upstreaming any of the tests.

Thanks,
Laura