dma-contiguous: support numa CMA for specified node

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The kernel parameter 'cma_pernuma=' only supports reserving the same
size of CMA area for each node. We need to reserve different sizes of
CMA area for specified nodes if these devices belong to different nodes.

Adding another kernel parameter 'numa_cma=' to reserve CMA area for
the specified node. If we want to use one of these parameters, we need to
enable DMA_NUMA_CMA.

At the same time, print the node id in cma_declare_contiguous_nid() if
CONFIG_NUMA is enabled.

Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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Yajun Deng 2023-07-12 15:47:58 +08:00 • committed by Christoph Hellwig

parent 22e4a348f8

commit bf29bfaa54

4 changed files with 102 additions and 29 deletions

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11

Documentation/admin-guide/kernel-parameters.txt

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9

kernel/dma/Kconfig

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99

kernel/dma/contiguous.c

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10

mm/cma.c

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