Purpose of these patches is to add a new dma-buf heap: linaro,secure-heap
Linaro OPTEE OS Secure Data Path feature is relying on a reserved memory
defined at Linux Kernel level and OPTEE OS level.
From Linux Kernel side, heap management is using dma-buf heaps interface.

John Stultz (2):
  ANDROID: dma-buf: heaps: Add deferred-free-helper library code
  ANDROID: dma-buf: heaps: Add a shrinker controlled page pool

Olivier Masse (3):
  dma-buf: heaps: add Linaro secure dmabuf heap support
  dt-bindings: reserved-memory: add linaro,secure-heap
  plat-hikey: Add linaro,secure-heap compatible

 .../reserved-memory/linaro,secure-heap.yaml   |  56 ++
 .../arm64/boot/dts/hisilicon/hi6220-hikey.dts |  11 +
 arch/arm64/configs/defconfig                  |   4 +
 drivers/dma-buf/heaps/Kconfig                 |  19 +
 drivers/dma-buf/heaps/Makefile                |   3 +
 drivers/dma-buf/heaps/deferred-free-helper.c  | 136 ++++
 drivers/dma-buf/heaps/deferred-free-helper.h  |  63 ++
 drivers/dma-buf/heaps/page_pool.c             | 246 ++++++++
 drivers/dma-buf/heaps/page_pool.h             |  55 ++
 drivers/dma-buf/heaps/secure_heap.c           | 588 ++++++++++++++++++
 10 files changed, 1181 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/linaro,secure-heap.yaml
 create mode 100644 drivers/dma-buf/heaps/deferred-free-helper.c
 create mode 100644 drivers/dma-buf/heaps/deferred-free-helper.h
 create mode 100644 drivers/dma-buf/heaps/page_pool.c
 create mode 100644 drivers/dma-buf/heaps/page_pool.h
 create mode 100644 drivers/dma-buf/heaps/secure_heap.c

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2.25.0