Re: [PATCH v16 0/5] DMA-BUF Heaps (destaging ION)

From: "Andrew F. Davis" <afd@ti.com>
To: John Stultz <john.stultz@linaro.org>,
	lkml <linux-kernel@vger.kernel.org>
Cc: Laura Abbott <labbott@redhat.com>,
	Benjamin Gaignard <benjamin.gaignard@linaro.org>,
	Sumit Semwal <sumit.semwal@linaro.org>,
	Liam Mark <lmark@codeaurora.org>,
	Pratik Patel <pratikp@codeaurora.org>,
	Brian Starkey <Brian.Starkey@arm.com>,
	Vincent Donnefort <Vincent.Donnefort@arm.com>,
	Sudipto Paul <Sudipto.Paul@arm.com>,
	Christoph Hellwig <hch@infradead.org>,
	Chenbo Feng <fengc@google.com>,
	Alistair Strachan <astrachan@google.com>,
	Hridya Valsaraju <hridya@google.com>,
	Sandeep Patil <sspatil@google.com>,
	Hillf Danton <hdanton@sina.com>, Dave Airlie <airlied@gmail.com>,
	<dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH v16 0/5] DMA-BUF Heaps (destaging ION)
Date: Mon, 18 Nov 2019 15:30:38 -0500	[thread overview]
Message-ID: <5a9ea98d-3486-8167-d2d5-aa055da65198@ti.com> (raw)
In-Reply-To: <20191118202332.109172-1-john.stultz@linaro.org>

On 11/18/19 3:23 PM, John Stultz wrote:
> Just wanted to resend v16 with a few minor changes.
> 
> This 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 reviewed (+2'ed) 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

ION's Carveout and Chunk heaps got dropped from upstream, so no gap
there. :)

Andrew

> 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 v16:
> * Typo fix suggested by Hridya Valsaraju <hridya@google.com>
> * Add extra error and ioctl compatibility testing suggested by
>   Daniel Vetter to the kselftest test
> 
> Thanks again for all the reviews and feedback!
> -john
> 
> Cc: Laura Abbott <labbott@redhat.com>
> Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org>
> Cc: Sumit Semwal <sumit.semwal@linaro.org>
> Cc: Liam Mark <lmark@codeaurora.org>
> Cc: Pratik Patel <pratikp@codeaurora.org>
> Cc: Brian Starkey <Brian.Starkey@arm.com>
> Cc: Vincent Donnefort <Vincent.Donnefort@arm.com>
> Cc: Sudipto Paul <Sudipto.Paul@arm.com>
> Cc: Andrew F. Davis <afd@ti.com>
> Cc: Christoph Hellwig <hch@infradead.org>
> Cc: Chenbo Feng <fengc@google.com>
> Cc: Alistair Strachan <astrachan@google.com>
> Cc: Hridya Valsaraju <hridya@google.com>
> Cc: Sandeep Patil <sspatil@google.com>
> Cc: Hillf Danton <hdanton@sina.com>
> Cc: Dave Airlie <airlied@gmail.com>
> Cc: dri-devel@lists.freedesktop.org
> 
> Andrew F. Davis (1):
>   dma-buf: Add dma-buf heaps framework
> 
> John Stultz (4):
>   dma-buf: heaps: Add heap helpers
>   dma-buf: heaps: Add system heap to dmabuf heaps
>   dma-buf: heaps: Add CMA heap to dmabuf heaps
>   kselftests: Add dma-heap test
> 
>  MAINTAINERS                                   |  18 +
>  drivers/dma-buf/Kconfig                       |  11 +
>  drivers/dma-buf/Makefile                      |   2 +
>  drivers/dma-buf/dma-heap.c                    | 297 +++++++++++++
>  drivers/dma-buf/heaps/Kconfig                 |  14 +
>  drivers/dma-buf/heaps/Makefile                |   4 +
>  drivers/dma-buf/heaps/cma_heap.c              | 177 ++++++++
>  drivers/dma-buf/heaps/heap-helpers.c          | 271 ++++++++++++
>  drivers/dma-buf/heaps/heap-helpers.h          |  53 +++
>  drivers/dma-buf/heaps/system_heap.c           | 123 ++++++
>  include/linux/dma-heap.h                      |  59 +++
>  include/uapi/linux/dma-heap.h                 |  53 +++
>  tools/testing/selftests/dmabuf-heaps/Makefile |   6 +
>  .../selftests/dmabuf-heaps/dmabuf-heap.c      | 396 ++++++++++++++++++
>  14 files changed, 1484 insertions(+)
>  create mode 100644 drivers/dma-buf/dma-heap.c
>  create mode 100644 drivers/dma-buf/heaps/Kconfig
>  create mode 100644 drivers/dma-buf/heaps/Makefile
>  create mode 100644 drivers/dma-buf/heaps/cma_heap.c
>  create mode 100644 drivers/dma-buf/heaps/heap-helpers.c
>  create mode 100644 drivers/dma-buf/heaps/heap-helpers.h
>  create mode 100644 drivers/dma-buf/heaps/system_heap.c
>  create mode 100644 include/linux/dma-heap.h
>  create mode 100644 include/uapi/linux/dma-heap.h
>  create mode 100644 tools/testing/selftests/dmabuf-heaps/Makefile
>  create mode 100644 tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
> 