linux-kernel - Re: [PATCH] dma-buf: heaps: Introduce dma_heap_add

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Date:   Fri, 31 Jul 2020 12:38:07 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        "Andrew F . Davis" <afd@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        Christian Koenig <christian.koenig@....com>,
        linux-media@...r.kernel.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dma-buf: heaps: Introduce dma_heap_add_cma() for
 non-default CMA heap

On Fri, Jul 31, 2020 at 2:32 AM Kunihiko Hayashi
<hayashi.kunihiko@...ionext.com> wrote:
> On 2020/07/29 4:17, John Stultz wrote:
> > Do you have a upstream driver that you plan to make use this new call?
>
> Unfortunately I don't have an upstream driver using this call.
>
> This call is called from dma-buf heaps "importer" or "customer",
> and I only made an example (do nothing) importer driver
> to test the call.
>
> > We want to have in-tree users of code added.
>
> I think this is a generic way to use non-default CMA heaps, however,
> we need in-tree "importer" drivers to want to use non-default CMA heaps.
> I don't find it from now.
>

Yea, I and again, I do agree this is functionality that will be
needed. But we'll need to wait for a user (camera driver, etc which
would utilize the reserved cma region) before we can merge it
upstream. :(  Do let me know if you have an out of tree driver that
would make use of it, and we can see what can be done to help upstream
things.

thanks
-john