diff options
| author | Christoph Hellwig <hch@lst.de> | 2019-08-03 13:31:25 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-09-04 11:13:18 +0200 |
| commit | e29ccc188f3dae1cb66f59e10e01e0f150642a54 (patch) | |
| tree | 50aefa076cec185f9ccc50c2696fb80d38ceb165 /include/linux/dma-mapping.h | |
| parent | f9f3232a7d0ab73a33d11f4056c5823010f03d55 (diff) | |
dma-mapping: add a dma_can_mmap helper
Add a helper to check if DMA allocations for a specific device can be
mapped to userspace using dma_mmap_*.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include/linux/dma-mapping.h')
| -rw-r--r-- | include/linux/dma-mapping.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index de41a4f0b9f6..10dc9ac3cccb 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -463,6 +463,7 @@ int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs); +bool dma_can_mmap(struct device *dev); int dma_supported(struct device *dev, u64 mask); int dma_set_mask(struct device *dev, u64 mask); int dma_set_coherent_mask(struct device *dev, u64 mask); @@ -554,6 +555,10 @@ static inline int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, { return -ENXIO; } +static inline bool dma_can_mmap(struct device *dev) +{ + return false; +} static inline int dma_supported(struct device *dev, u64 mask) { return 0; |