Re: [RESEND][PATCH v8 0/5] DMA-BUF Heaps (destaging ION)

[John Stultz]

On Fri, Oct 18, 2019 at 11:41 AM Ayan Halder <Ayan.Halder@xxxxxxx> wrote:
> On Fri, Oct 18, 2019 at 09:55:17AM +0000, Brian Starkey wrote:
> > On Thu, Oct 17, 2019 at 01:57:45PM -0700, John Stultz wrote:
> > > On Thu, Oct 17, 2019 at 12:29 PM Andrew F. Davis <afd@xxxxxx> wrote:
> > > > On 10/17/19 3:14 PM, John Stultz wrote:
> > > > > But if the objection stands, do you have a proposal for an alternative
> > > > > way to enumerate a subset of CMA heaps?
> > > > >
> > > > When in staging ION had to reach into the CMA framework as the other
> > > > direction would not be allowed, so cma_for_each_area() was added. If
> > > > DMA-BUF heaps is not in staging then we can do the opposite, and have
> > > > the CMA framework register heaps itself using our framework. That way
> > > > the CMA system could decide what areas to export or not (maybe based on
> > > > a DT property or similar).
> > >
> > > Ok. Though the CMA core doesn't have much sense of DT details either,
> > > so it would probably have to be done in the reserved_mem logic, which
> > > doesn't feel right to me.
> > >
> > > I'd probably guess we should have some sort of dt binding to describe
> > > a dmabuf cma heap and from that node link to a CMA node via a
> > > memory-region phandle. Along with maybe the default heap as well? Not
> > > eager to get into another binding review cycle, and I'm not sure what
> > > non-DT systems will do yet, but I'll take a shot at it and iterate.
> > >
> > > > The end result is the same so we can make this change later (it has to
> > > > come after DMA-BUF heaps is in anyway).
> > >
> > > Well, I'm hesitant to merge code that exposes all the CMA heaps and
> > > then add patches that becomes more selective, should anyone depend on
> > > the initial behavior. :/
> >
> > How about only auto-adding the system default CMA region (cma->name ==
> > "reserved")?
> >
> > And/or the CMA auto-add could be behind a config option? It seems a
> > shame to further delay this, and the CMA heap itself really is useful.
> >
> A bit of a detour, comming back to the issue why the following node
> was not getting detected by the dma-buf heaps framework.
>
>         reserved-memory {
>                 #address-cells = <2>;
>                 #size-cells = <2>;
>                 ranges;
>
>                 display_reserved: framebuffer@60000000 {
>                         compatible = "shared-dma-pool";
>                         linux,cma-default;
>                         reusable; <<<<<<<<<<<<-----------This was missing in our
> earlier node
>                         reg = <0 0x60000000 0 0x08000000>;
>                 };

Right. It has to be a CMA region for us to expose it from the cma heap.


> With 'reusable', rmem_cma_setup() succeeds , but the kernel crashes as follows :-
>
> [    0.450562] WARNING: CPU: 2 PID: 1 at mm/cma.c:110 cma_init_reserved_areas+0xec/0x22c

Is the value 0x60000000 you're using something you just guessed at? It
seems like the warning here is saying the pfn calculated from the base
address isn't valid.

thanks
-john