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dma: Provide simple noop dma ops

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We are going to require dma_ops for several common drivers, even for
systems that do have an identity mapping. Lets provide some minimal
no-op dma_ops that can be used for that purpose.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Christian Borntraeger
2016-02-02 21:46:32 -08:00
committed by Michael S. Tsirkin
parent e1f33be918
commit a8463d4b0e
3 changed files with 78 additions and 0 deletions
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2
include/linux/dma-mapping.h
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@@ -70,6 +70,8 @@ struct dma_map_ops {
int is_phys;
};
extern struct dma_map_ops dma_noop_ops;
#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
#define DMA_MASK_NONE 0x0ULL