Re: [PATCH v12 4/5] dma-buf: heaps: Add CMA heap to dmabuf heaps

[John Stultz]

On Fri, Oct 18, 2019 at 5:04 AM Benjamin Gaignard
<benjamin.gaignard@xxxxxxxxxx> wrote:
> Le ven. 18 oct. 2019 Ã 13:21, Brian Starkey <Brian.Starkey@xxxxxxx> a Ãcrit :
> >
> > On Fri, Oct 18, 2019 at 05:23:22AM +0000, John Stultz wrote:
> > > This adds a CMA heap, which allows userspace to allocate
> > > a dma-buf of contiguous memory out of a CMA region.
> > >
> > > This code is an evolution of the Android ION implementation, so
> > > thanks to its original author and maintainters:
> > >   Benjamin Gaignard, Laura Abbott, and others!
> > >
> > > NOTE: This patch only adds the default CMA heap. We will enable
> > > selectively adding other CMA memory regions to the dmabuf heaps
> > > interface with a later patch (which requires a dt binding)
>
> Maybe we can use "no-map" DT property to trigger that. If set do not expose the
> cma heap.

I don't think that's a good plan. See my WIP tree for the approach I'm planning:
  https://git.linaro.org/people/john.stultz/android-dev.git/log/?h=dev/dma-buf-heap-WIP

thanks
-john