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swiotlb-xen: implement xen_swiotlb_dma_mmap callback

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This function creates userspace mapping for the DMA-coherent memory.

Signed-off-by: Stefano Stabellini <[email protected]>
Signed-off-by: Oleksandr Dmytryshyn <[email protected]>
Signed-off-by: Andrii Anisov <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
This commit is contained in:
Stefano Stabellini 2017-02-07 19:58:02 +02:00 • committed by Konrad Rzeszutek Wilk
commit 7e91c7df29
3 changed files with 25 additions and 0 deletions
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19
drivers/xen/swiotlb-xen.c
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@ -680,3 +680,22 @@ xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask)
return 0;
}
EXPORT_SYMBOL_GPL(xen_swiotlb_set_dma_mask);
/*
* Create userspace mapping for the DMA-coherent memory.
* This function should be called with the pages from the current domain only,
* passing pages mapped from other domains would lead to memory corruption.
*/
int
xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
if (__generic_dma_ops(dev)->mmap)
return __generic_dma_ops(dev)->mmap(dev, vma, cpu_addr,
dma_addr, size, attrs);
#endif
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
}
EXPORT_SYMBOL_GPL(xen_swiotlb_dma_mmap);