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

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Message-ID: <CAO_48GHk8b=7Rs2CYZvnki2EMpeo_4FRy+_3F0Mv_nAK42MpgQ@mail.gmail.com>
Date:   Fri, 25 Oct 2019 11:26:44 +0530
From:   Sumit Semwal <sumit.semwal@...aro.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Laura Abbott <labbott@...hat.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Pratik Patel <pratikp@...eaurora.org>,
        Brian Starkey <Brian.Starkey@....com>,
        Vincent Donnefort <Vincent.Donnefort@....com>,
        Sudipto Paul <Sudipto.Paul@....com>,
        "Andrew F . Davis" <afd@...com>,
        Christoph Hellwig <hch@...radead.org>,
        Chenbo Feng <fengc@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Hillf Danton <hdanton@...a.com>,
        DRI mailing list <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v13 0/5] DMA-BUF Heaps (destaging ION)

Hi John,

On Tue, 22 Oct 2019 at 00:33, John Stultz <john.stultz@...aro.org> 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.

This looks good to me, and hasn't seen any more comments, so I am
going to merge it via drm-misc-next today.
>
> 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
>
> And the userspace changes here:
>   https://android-review.googlesource.com/c/device/linaro/hikey/+/909436
>
> Compared to ION, this patchset is missing the system-contig,
> carveout and chunk heaps, as I don't have a device that uses
> those, so I'm unable to do much useful validation there.
> Additionally we have no upstream users of chunk or carveout,
> and the system-contig has been deprecated in the common/andoid-*
> kernels, so this should be ok.
>
> I've also removed the stats accounting, since any such
> accounting should be implemented by dma-buf core or the heaps
> themselves.
>
> New in v13:
> * Re-remove symbol exports, per discussion with Brian. I'll
>   resubmit these separately in a later patch so they can be
>   independently reviewed
>
> thanks
> -john

<snip>

Best,
Sumit.