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dma-mapping: add new {alloc,free}_noncoherent dma_map_ops methods

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This will allow IOMMU drivers to allocate non-contigous memory and
return a vmapped virtual address.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2020-09-01 13:59:45 +02:00
parent efa70f2fdc
commit de7cf91776
2 changed files with 32 additions and 6 deletions
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5
include/linux/dma-mapping.h
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@ -74,6 +74,11 @@ struct dma_map_ops {
gfp_t gfp);
void (*free_pages)(struct device *dev, size_t size, struct page *vaddr,
dma_addr_t dma_handle, enum dma_data_direction dir);
void* (*alloc_noncoherent)(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir,
gfp_t gfp);
void (*free_noncoherent)(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, enum dma_data_direction dir);
int (*mmap)(struct device *, struct vm_area_struct *,
void *, dma_addr_t, size_t,
unsigned long attrs);