[PATCH v13 0/5] DMA-BUF Heaps (destaging ION)

John Stultz john.stultz at linaro.org
Mon Oct 21 19:03:05 UTC 2019

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

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:

And the userspace changes here:

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

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


Cc: Laura Abbott <labbott at redhat.com>
Cc: Benjamin Gaignard <benjamin.gaignard at linaro.org>
Cc: Sumit Semwal <sumit.semwal at linaro.org>
Cc: Liam Mark <lmark at codeaurora.org>
Cc: Pratik Patel <pratikp at codeaurora.org>
Cc: Brian Starkey <Brian.Starkey at arm.com>
Cc: Vincent Donnefort <Vincent.Donnefort at arm.com>
Cc: Sudipto Paul <Sudipto.Paul at arm.com>
Cc: Andrew F. Davis <afd at ti.com>
Cc: Christoph Hellwig <hch at infradead.org>
Cc: Chenbo Feng <fengc at google.com>
Cc: Alistair Strachan <astrachan at google.com>
Cc: Hridya Valsaraju <hridya at google.com>
Cc: Hillf Danton <hdanton at sina.com>
Cc: dri-devel at 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                    | 269 ++++++++++++++++++
 drivers/dma-buf/heaps/Kconfig                 |  14 +
 drivers/dma-buf/heaps/Makefile                |   4 +
 drivers/dma-buf/heaps/cma_heap.c              | 178 ++++++++++++
 drivers/dma-buf/heaps/heap-helpers.c          | 268 +++++++++++++++++
 drivers/dma-buf/heaps/heap-helpers.h          |  55 ++++
 drivers/dma-buf/heaps/system_heap.c           | 124 ++++++++
 include/linux/dma-heap.h                      |  59 ++++
 include/uapi/linux/dma-heap.h                 |  55 ++++
 tools/testing/selftests/dmabuf-heaps/Makefile |   9 +
 .../selftests/dmabuf-heaps/dmabuf-heap.c      | 238 ++++++++++++++++
 14 files changed, 1304 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


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