[RFC][PATCH 0/3] Support non-default CMA regions to the dmabuf heaps interface

John Stultz john.stultz at linaro.org
Fri Oct 25 22:50:06 UTC 2019

Now that the dmabuf heaps core code has been queued, I wanted to
submit for initial review some of the changes I have pending.

In previous versions, the dmabuf CMA heap added all CMA areas to
the dmabuf heaps interface. However, Andrew noted this may not
be desirable, so I've come up with a DT binding and code to
allow specified CMA regions to be added to the dmabuf heaps

This allows additional CMA regions for things like cameras, etc
to be allocated from separately from the default region.

Review and feedback would be greatly appreciated!


Cc: Rob Herring <robh+dt at kernel.org>
Cc: Mark Rutland <mark.rutland at arm.com>
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: Andrew F. Davis <afd at ti.com>
Cc: Chenbo Feng <fengc at google.com>
Cc: Alistair Strachan <astrachan at google.com>
Cc: Sandeep Patil <sspatil at google.com>
Cc: Hridya Valsaraju <hridya at google.com>
Cc: devicetree at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org

John Stultz (3):
  dt-bindings: dma-buf: heaps: Describe CMA regions to be added to
    dmabuf heaps interface.
  dma-buf: heaps: Allow adding specified non-default CMA heaps
  example: dts: hi3660-hikey960: Add dts entries to test cma heap

 .../bindings/dma/dmabuf-heap-cma.txt          | 31 +++++++++++++++
 .../boot/dts/hisilicon/hi3660-hikey960.dts    | 13 ++++++-
 drivers/dma-buf/heaps/cma_heap.c              | 38 +++++++++++++++++++
 3 files changed, 81 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/dma/dmabuf-heap-cma.txt


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