[PATCH 0/9] dma-buf: heaps: Add MediaTek secure heap

[Yong Wu <yong.wu@mediatek.com>]

This patchset consists of two parts, the first is from John and TJ.
It adds some heap interfaces, then our kernel users could allocate buffer
from special heap. The second part is adding MTK secure heap for SVP
(Secure Video Path). A total of two heaps are added, one is mtk_svp and
the other is mtk_svp_cma. The mtk_svp buffer is reserved for the secure
world after bootup and it is used for ES/working buffer, while the
mtk_svp_cma buffer is dynamically reserved for the secure world and will
be get ready when we start playing secure videos, this heap is used for the
frame buffer. Once the security video playing is complete, the CMA will be
released.

For easier viewing, I've split the new heap file into several patches.

The consumers of new heap and new interfaces are our codec and drm which
will send upstream soon, probably this week.

Base on v6.6-rc1.

John Stultz (2):
  dma-heap: Add proper kref handling on dma-buf heaps
  dma-heap: Provide accessors so that in-kernel drivers can allocate
    dmabufs from specific heaps

T.J. Mercier (1):
  dma-buf: heaps: Deduplicate docs and adopt common format

Yong Wu (6):
  dma-buf: heaps: Initialise MediaTek secure heap
  dma-buf: heaps: mtk_sec_heap: Initialise tee session
  dma-buf: heaps: mtk_sec_heap: Add tee service call for buffer
    allocating/freeing
  dma-buf: heaps: mtk_sec_heap: Add dma_ops
  dt-bindings: reserved-memory: MediaTek: Add reserved memory for SVP
  dma_buf: heaps: mtk_sec_heap: Add a new CMA heap

 .../mediatek,secure_cma_chunkmem.yaml         |  42 ++
 drivers/dma-buf/dma-heap.c                    | 127 +++--
 drivers/dma-buf/heaps/Kconfig                 |   8 +
 drivers/dma-buf/heaps/Makefile                |   1 +
 drivers/dma-buf/heaps/mtk_secure_heap.c       | 458 ++++++++++++++++++
 include/linux/dma-heap.h                      |  42 +-
 6 files changed, 630 insertions(+), 48 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,secure_cma_chunkmem.yaml
 create mode 100644 drivers/dma-buf/heaps/mtk_secure_heap.c

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2.18.0