dma-pool: introduce dma_guess_pool()

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dma-pool's dev_to_pool() creates the false impression that there is a
way to grantee a mapping between a device's DMA constraints and an
atomic pool. It tuns out it's just a guess, and the device might need to
use an atomic pool containing memory from a 'safer' (or lower) memory
zone.

To help mitigate this, introduce dma_guess_pool() which can be fed a
device's DMA constraints and atomic pools already known to be faulty, in
order for it to provide an better guess on which pool to use.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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Nicolas Saenz Julienne 2020-07-14 14:39:27 +02:00 • committed by Christoph Hellwig

parent 23e469be62

commit 48b6703858

1 changed files with 23 additions and 3 deletions

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kernel/dma/pool.c

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