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Date:   Fri, 15 Mar 2019 19:15:47 -0400
From:   Jerome Glisse <>
To:     John Stultz <>
Cc:     lkml <>,
        Greg KH <>,
        Chenbo Feng <>,
        Alistair Strachan <>,
        Liam Mark <>,, "Andrew F . Davis" <>
Subject: Re: [RFC][PATCH 0/5 v2] DMA-BUF Heaps (destaging ION)

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:
> And the userspace changes here:

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


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