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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2016-02-02 21:46:32 -0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2016-03-02 17:01:55 +0200 |
| commit | a8463d4b0e47d1f37af684d97884ffcf35de043b (patch) | |
| tree | 22edc03944c201629c6fd2c77805b014c05f9fbc /include/linux/dma-mapping.h | |
| parent | e1f33be9186363da7955bcb5f0b03e6685544c50 (diff) | |
| download | linux-a8463d4b0e47d1f37af684d97884ffcf35de043b.tar.gz linux-a8463d4b0e47d1f37af684d97884ffcf35de043b.tar.bz2 linux-a8463d4b0e47d1f37af684d97884ffcf35de043b.zip | |
dma: Provide simple noop dma ops
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>
Diffstat (limited to 'include/linux/dma-mapping.h')
| -rw-r--r-- | include/linux/dma-mapping.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 75857cda38e9..c0b27ff2c784 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -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 |