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    SubjectRe: [PATCH 0/4] Chunk Heap Support on DMA-HEAP
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    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
    >


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