dma-direct: add support for dma_coherent_default_memory

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Add an option to allocate uncached memory for dma_alloc_coherent from
the global dma_coherent_default_memory.  This will allow to move
arm-nommu (and eventually other platforms) to use generic code for
allocating uncached memory from a pre-populated pool.

Note that this is a different pool from the one that platforms that
can remap at runtime use for GFP_ATOMIC allocations for now, although
there might be opportunities to eventually end up with a common codebase
for the two use cases.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Dillon Min <dillon.minfei@gmail.com>

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Christoph Hellwig 2021-06-23 14:21:16 +02:00

parent 2a047e0662

commit faf4ef823a

2 changed files with 19 additions and 0 deletions

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4

kernel/dma/Kconfig

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15

kernel/dma/direct.c

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