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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>
This commit is contained in:
Yajun Deng
2023-07-12 15:47:58 +08:00
committed by Christoph Hellwig
parent 22e4a348f8
commit bf29bfaa54
4 changed files with 101 additions and 28 deletions
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9
kernel/dma/Kconfig
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@@ -145,15 +145,16 @@ config DMA_CMA
if DMA_CMA
config DMA_PERNUMA_CMA
bool "Enable separate DMA Contiguous Memory Area for each NUMA Node"
config DMA_NUMA_CMA
bool "Enable separate DMA Contiguous Memory Area for NUMA Node"
default NUMA
help
Enable this option to get pernuma CMA areas so that NUMA devices
Enable this option to get numa CMA areas so that NUMA devices
can get local memory by DMA coherent APIs.
You can set the size of pernuma CMA by specifying "cma_pernuma=size"
on the kernel's command line.
or set the node id and its size of CMA by specifying "numa_cma=
<node>:size[,<node>:size]" on the kernel's command line.
comment "Default contiguous memory area size:"