Re: [PATCH] dma-buf: heaps: Introduce dma_heap_add_cma() for non-default CMA heap

[John Stultz]

On Fri, Jul 31, 2020 at 2:32 AM Kunihiko Hayashi
<hayashi.kunihiko@xxxxxxxxxxxxx> 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