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ARM: dma-mapping: Add arm_iommu_detach_device() 

A counter part of arm_iommu_attach_device().

Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Hiroshi Doyu 2013-01-24 15:16:57 +02:00 committed by Marek Szyprowski
parent fab112a394
commit 6fe3675803
2 changed files with 26 additions and 0 deletions
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1
arch/arm/include/asm/dma-iommu.h
View File

@ -30,6 +30,7 @@ void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
int arm_iommu_attach_device(struct device *dev, int arm_iommu_attach_device(struct device *dev,
struct dma_iommu_mapping *mapping); struct dma_iommu_mapping *mapping);
void arm_iommu_detach_device(struct device *dev);
#endif /* __KERNEL__ */ #endif /* __KERNEL__ */
#endif #endif

25
arch/arm/mm/dma-mapping.c
View File

@ -1848,4 +1848,29 @@ int arm_iommu_attach_device(struct device *dev,
return 0; return 0;
} }
/**
* arm_iommu_detach_device
* @dev: valid struct device pointer
*
* Detaches the provided device from a previously attached map.
* This voids the dma operations (dma_map_ops pointer)
*/
void arm_iommu_detach_device(struct device *dev)
{
struct dma_iommu_mapping *mapping;
mapping = to_dma_iommu_mapping(dev);
if (!mapping) {
dev_warn(dev, "Not attached\n");
return;
}
iommu_detach_device(mapping->domain, dev);
kref_put(&mapping->kref, release_iommu_mapping);
mapping = NULL;
set_dma_ops(dev, NULL);
pr_debug("Detached IOMMU controller from %s device.\n", dev_name(dev));
}
#endif #endif