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Date:   Fri, 15 Mar 2019 19:15:47 -0400
From:   Jerome Glisse <jglisse@redhat.com>
To:     John Stultz <john.stultz@linaro.org>
Cc:     lkml <linux-kernel@vger.kernel.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        Chenbo Feng <fengc@google.com>,
        Alistair Strachan <astrachan@google.com>,
        Liam Mark <lmark@codeaurora.org>,
        dri-devel@lists.freedesktop.org, "Andrew F . Davis" <afd@ti.com>
Subject: Re: [RFC][PATCH 0/5 v2] DMA-BUF Heaps (destaging ION)
Message-ID: <20190315231547.GB3242@redhat.com>
References: <1551819273-640-1-git-send-email-john.stultz@linaro.org>
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On Tue, Mar 05, 2019 at 12:54:28PM -0800, John Stultz wrote:
> Here is a initial RFC of the dma-buf heaps patchset Andrew and I
> have been working on which tries to destage a fair chunk of ION
> functionality.
> 
> 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 simple system and cma heaps. The system
> heap in particular is missing the page-pool optimizations ION
> had, but works well enough to validate the interface.
> 
> 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

What upstream driver will use this eventualy ? And why is it
needed ?

Cheers,
J?r?me