[RFC][PATCH 0/4] Support non-default CMA regions to the dmabuf heaps interface

[John Stultz]

This is a much belated second stab at allowing non-default CMA
regions to be exposed via the dmabuf heaps interface.

Previous attempt was here:
 https://lore.kernel.org/lkml/20191025225009.50305-2-john.stultz@xxxxxxxxxx/T/

This pass tried to take Rob's earlier suggestion to use a flag
property.

Feedback would be greatly welcome!

thanks
-john

Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: "Andrew F. Davis" <afd@xxxxxx>
Cc: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
Cc: Liam Mark <lmark@xxxxxxxxxxxxxx>
Cc: Pratik Patel <pratikp@xxxxxxxxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Cc: Brian Starkey <Brian.Starkey@xxxxxxx>
Cc: Chenbo Feng <fengc@xxxxxxxxxx>
Cc: Alistair Strachan <astrachan@xxxxxxxxxx>
Cc: Sandeep Patil <sspatil@xxxxxxxxxx>
Cc: Hridya Valsaraju <hridya@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx

John Stultz (4):
  devicetree: bindings: Add linux,cma-heap tag for reserved memory
  mm: cma: Add dma_heap flag to cma structure
  dma-buf: cma_heap: Extend logic to export CMA regions tagged with
    "linux,cma-heap"
  example: dts: hi3660-hikey960: Add dts entries to test cma heap
    binding

 .../reserved-memory/reserved-memory.txt        |  3 +++
 .../boot/dts/hisilicon/hi3660-hikey960.dts     |  7 +++++++
 drivers/dma-buf/heaps/cma_heap.c               | 18 +++++++++---------
 include/linux/cma.h                            |  3 +++
 kernel/dma/contiguous.c                        |  3 +++
 mm/cma.c                                       | 11 +++++++++++
 mm/cma.h                                       |  1 +
 7 files changed, 37 insertions(+), 9 deletions(-)

-- 
2.17.1