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swiotlb-xen: introduce xen_swiotlb_set_dma_mask

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Implement xen_swiotlb_set_dma_mask, use it for set_dma_mask on arm.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Stefano Stabellini 2013-10-09 16:56:33 +00:00
parent 83862ccfc0
commit eb1ddc00b8
3 changed files with 15 additions and 0 deletions
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1
arch/arm/xen/mm.c
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@ -51,6 +51,7 @@ static struct dma_map_ops xen_swiotlb_dma_ops = {
.map_page = xen_swiotlb_map_page, .map_page = xen_swiotlb_map_page,
.unmap_page = xen_swiotlb_unmap_page, .unmap_page = xen_swiotlb_unmap_page,
.dma_supported = xen_swiotlb_dma_supported, .dma_supported = xen_swiotlb_dma_supported,
.set_dma_mask = xen_swiotlb_set_dma_mask,
}; };
int __init xen_mm_init(void) int __init xen_mm_init(void)

12
drivers/xen/swiotlb-xen.c
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@ -608,3 +608,15 @@ xen_swiotlb_dma_supported(struct device *hwdev, u64 mask)
return xen_virt_to_bus(xen_io_tlb_end - 1) <= mask; return xen_virt_to_bus(xen_io_tlb_end - 1) <= mask;
} }
EXPORT_SYMBOL_GPL(xen_swiotlb_dma_supported); EXPORT_SYMBOL_GPL(xen_swiotlb_dma_supported);
int
xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask)
{
if (!dev->dma_mask || !xen_swiotlb_dma_supported(dev, dma_mask))
return -EIO;
*dev->dma_mask = dma_mask;
return 0;
}
EXPORT_SYMBOL_GPL(xen_swiotlb_set_dma_mask);

2
include/xen/swiotlb-xen.h
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@ -55,4 +55,6 @@ xen_swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
extern int extern int
xen_swiotlb_dma_supported(struct device *hwdev, u64 mask); xen_swiotlb_dma_supported(struct device *hwdev, u64 mask);
extern int
xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask);
#endif /* __LINUX_SWIOTLB_XEN_H */ #endif /* __LINUX_SWIOTLB_XEN_H */