Le mardi 17 novembre 2020 à 10:19 -0800, Minchan Kim a écrit :

This patchset introduces a new dma heap, chunk heap that makes it
easy to perform the bulk allocation of high order pages.
It has been created to help optimize the 4K/8K HDR video playback
with secure DRM HW to protect contents on memory. The HW needs
physically contiguous memory chunks up to several hundred MB memory.

The chunk heap is registered by device tree with alignment and memory
node of Contiguous Memory Allocator(CMA). Alignment defines chunk page size.
For example, alignment 0x1_0000 means chunk page size is 64KB.
The phandle to memory node indicates contiguous memory allocator(CMA).
If device node doesn't have cma, the registration of chunk heap fails.

This patchset is against on next-20201110.

I believe you have forgot to reference Open Source / Upstream code using this.

regards,
Nicolas

The patchset includes the following:
 - cma_alloc_bulk API
 - export dma-heap API to register kernel module dma heap.
 - add chunk heap implementation.
 - devicetree

Hyesoo Yu (3):
  dma-buf: add export symbol for dma-heap
  dma-buf: heaps: add chunk heap to dmabuf heaps
  dma-heap: Devicetree binding for chunk heap

Minchan Kim (1):
  mm: introduce cma_alloc_bulk API

 .../bindings/dma-buf/chunk_heap.yaml          |  52 ++
 drivers/dma-buf/dma-heap.c                    |   2 +
 drivers/dma-buf/heaps/Kconfig                 |   9 +
 drivers/dma-buf/heaps/Makefile                |   1 +
 drivers/dma-buf/heaps/chunk_heap.c            | 458 ++++++++++++++++++
 include/linux/cma.h                           |   5 +
 include/linux/page-isolation.h                |   1 +
 mm/cma.c                                      | 129 ++++-
 mm/page_alloc.c                               |  19 +-
 mm/page_isolation.c                           |   3 +-
 10 files changed, 666 insertions(+), 13 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/dma-buf/chunk_heap.yaml
 create mode 100644 drivers/dma-buf/heaps/chunk_heap.c