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

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Date:   Fri, 15 Mar 2019 13:07:29 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     John Stultz <john.stultz@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        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 3/6/19 9:01 AM, John Stultz wrote:
> 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
> 

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