dma-mapping: warn when coherent pool is depleted

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When a DMA coherent pool is depleted, allocation failures may or may not
get reported in the kernel log depending on the allocator.

The admin does have a workaround, however, by using coherent_pool= on the
kernel command line.

Provide some guidance on the failure and a recommended minimum size for
the pools (double the size).

Signed-off-by: David Rientjes <rientjes@google.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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David Rientjes 2020-06-21 13:43:02 -07:00 • committed by Christoph Hellwig

parent 9ebcfadb06

commit 71cdec4fab

1 changed files with 5 additions and 1 deletions

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kernel/dma/pool.c

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