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

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Message-ID: <CALAqxLWxpExDpiKbNGQ6Oz5h=FUPNLvehm34JdrntLQjFed41w@mail.gmail.com>
Date:   Wed, 6 Mar 2019 09:01:07 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Laura Abbott <labbott@...hat.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Brian Starkey <Brian.Starkey@....com>,
        "Andrew F . Davis" <afd@...com>, Chenbo Feng <fengc@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [RFC][PATCH 5/5 v2] kselftests: Add dma-heap test

On Wed, Mar 6, 2019 at 8:14 AM Benjamin Gaignard
<benjamin.gaignard@...aro.org> wrote:
> Le mar. 5 mars 2019 à 21:54, John Stultz <john.stultz@...aro.org> a écrit :
> > +
> > +       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