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| author |   Hiroshi Doyu <hdoyu@nvidia.com> | 2013-01-24 15:16:57 +0200 |
|---|---|---|
| committer |   Marek Szyprowski <m.szyprowski@samsung.com> | 2013-02-25 15:30:41 +0100 |
| commit | 6fe367580339a3adf77273d4366652665319bdeb (patch) | |
| tree | 211fd3d066c016afaac35d1802d7cd09b64a1f73 /arch | |
| parent | ARM: dma-mapping: Add macro to_dma_iommu_mapping() (diff) | |
| download | linux-dev-6fe367580339a3adf77273d4366652665319bdeb.tar.xz linux-dev-6fe367580339a3adf77273d4366652665319bdeb.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/include/asm/dma-iommu.h | 1 | ||||
| -rw-r--r-- | arch/arm/mm/dma-mapping.c | 25 |
2 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h index 666d8a8c3a2b..a8c56acc8c98 100644 --- a/arch/arm/include/asm/dma-iommu.h +++ b/arch/arm/include/asm/dma-iommu.h @@ -30,6 +30,7 @@ void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping); int arm_iommu_attach_device(struct device *dev, struct dma_iommu_mapping *mapping); +void arm_iommu_detach_device(struct device *dev); #endif /* __KERNEL__ */ #endif diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index d91c4880f559..6563e3872659 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -1848,4 +1848,29 @@ int arm_iommu_attach_device(struct device *dev, 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 |