[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@linaro.org/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 at kernel.org>
Cc: Sumit Semwal <sumit.semwal at linaro.org>
Cc: "Andrew F. Davis" <afd at ti.com>
Cc: Benjamin Gaignard <benjamin.gaignard at linaro.org>
Cc: Liam Mark <lmark at codeaurora.org>
Cc: Pratik Patel <pratikp at codeaurora.org>
Cc: Laura Abbott <labbott at redhat.com>
Cc: Brian Starkey <Brian.Starkey at arm.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: Christoph Hellwig <hch at lst.de>
Cc: Marek Szyprowski <m.szyprowski at samsung.com>
Cc: Robin Murphy <robin.murphy at arm.com>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: devicetree at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Cc: linux-mm at kvack.org

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