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arm64/imx9: Add DMA memory allocator #12228

Merged
merged 2 commits into from
Apr 30, 2024
Merged

arm64/imx9: Add DMA memory allocator #12228

merged 2 commits into from
Apr 30, 2024

Commits on Apr 30, 2024

  1. arm64/imx9: Add DMA memory allocator 

    Add a simple allocator for DMA safe memory. It will provide contiguous
blocks of memory with D-Cache line size alignment.

NOTE: The optimal granule size is the D-Cache line size (64), but due
to restrictions in the granule allocator this would result in a maximum
block size of 2K only, thus use 256B granules instead givin 8K max block
size.

Once the granule allocator is fixed this limitation can be removed.
    @pussuw
    pussuw committed Apr 30, 2024
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  2. arch/imx9_lpspi: Use DMA safe buffers to do the DMA transfers 

    Using user allocated buffers for DMA transfers is not safe for two reasons:
- User space memory is virtual memory, DMA needs physical memory
- User memory buffer alignment cannot be guaranteed -> cache line ops
  are not safe
    @pussuw
    pussuw committed Apr 30, 2024
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