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

[Nicolas Dufresne]

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
>