linux-kernel - Re: [PATCH v13 0/5] DMA-BUF Heaps (destaging ION)

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Date:   Tue, 22 Oct 2019 08:56:06 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Hillf Danton <hdanton@...a.com>,
        Sudipto Paul <Sudipto.Paul@....com>,
        Vincent Donnefort <Vincent.Donnefort@....com>,
        Chenbo Feng <fengc@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        Liam Mark <lmark@...eaurora.org>,
        Christoph Hellwig <hch@...radead.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "Andrew F . Davis" <afd@...com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Pratik Patel <pratikp@...eaurora.org>
Subject: Re: [PATCH v13 0/5] DMA-BUF Heaps (destaging ION)

On Tue, Oct 22, 2019 at 1:21 AM Neil Armstrong <narmstrong@...libre.com> wrote:
>
> Hi John,
>
> On 21/10/2019 21:03, John Stultz wrote:
> > Lucky number 13! :)
> >
> > Last week in v12 I had re-added some symbol exports to support
> > later patches I have pending to enable loading heaps from
> > modules. He reminded me that back around v3 (its been awhile!) I
> > had removed those exports due to concerns about the fact that we
> > don't support module removal.
> >
> > So I'm respinning the patches, removing the exports again. I'll
> > submit a patch to re-add them in a later series enabling moduels
> > which can be reviewed indepently.
> >
> > With that done, lets get on to the boilerplate!
> >
> > The patchset implements per-heap devices which can be opened
> > directly and then an ioctl is used to allocate a dmabuf from the
> > heap.
> >
> > The interface is similar, but much simpler then IONs, only
> > providing an ALLOC ioctl.
> >
> > Also, I've provided relatively simple system and cma heaps.
> >
> > I've booted and tested these patches with AOSP on the HiKey960
> > using the kernel tree here:
> >   https://git.linaro.org/people/john.stultz/android-dev.git/log/?h=dev/dma-buf-heap
>
> Do you have a 4.19 tree with the changes ? I tried but the xarray idr replacement
> is missing... so I can't test with our android-amlogic-bmeson-4.19 tree.
>
> If you can provide, I'll be happy to test the serie and the gralloc changes.

Unfortunately I don't have a 4.19 version of dmabuf heaps (all the
work has been done this year, post 4.19). I'm planning to backport to
5.4 for AOSP, but I've not really thought about 4.19. Most likely I
won't have time to look at it until after the changes are upstream and
the 5.4 backport is done.

Is the bmeson tree likely to only stay at 4.19? Or will it move forward?

thanks
-john