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| author |   Christoph Hellwig <hch@lst.de> | 2019-08-06 15:01:38 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-09-04 11:13:19 +0200 |
| commit | 249baa54790171438524ba97e8e0485dd6aa2762 (patch) | |
| tree | cf5dc669ac064a93a37912f25aa7910d7e8db58d /include/linux/dma-mapping.h | |
| parent | dma-mapping: remove the dma_declare_coherent_memory export (diff) | |
| download | wireguard-linux-249baa54790171438524ba97e8e0485dd6aa2762.tar.xz wireguard-linux-249baa54790171438524ba97e8e0485dd6aa2762.zip | |
dma-mapping: provide a better default ->get_required_mask
Most dma_map_ops instances are IOMMUs that work perfectly fine in 32-bits
of IOVA space, and the generic direct mapping code already provides its
own routines that is intelligent based on the amount of memory actually
present. Wire up the dma-direct routine for the ARM direct mapping code
as well, and otherwise default to the constant 32-bit mask. This way
we only need to override it for the occasional odd IOMMU that requires
64-bit IOVA support, or IOMMU drivers that are more efficient if they
can fall back to the direct mapping.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include/linux/dma-mapping.h')
0 files changed, 0 insertions, 0 deletions