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arm64: dma-mapping: fix build when !CONFIG_ARM64_DMA_USE_IOMMU

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When CONFIG_ARM64_DMA_USE_IOMMU is not selected, drivers that make use
of the ARM DMA IOMMU mapping APIs currently don't link.  First instinct
might be to add a dependency on CONFIG_ARM64_DMA_USE_IOMMU to those
drivers, but they might not actually want to do that because they might
have other ways of getting DMA-able memory.

Allow compilation when CONFIG_ARM64_DMA_USE_IOMMU is not selected by
providing necessary stub functions.

Change-Id: I172e00a0748c70676b8ff7555e217a1e6122e3e6
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
This commit is contained in:
Mitchel Humpherys 2014-12-18 17:03:04 -08:00 • committed by David Keitel
parent 95d01c7209
commit 6e0817546a
1 changed files with 27 additions and 0 deletions
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27
arch/arm64/include/asm/dma-iommu.h
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@ -22,6 +22,8 @@ struct dma_iommu_mapping {
struct kref kref;
};
#ifdef CONFIG_ARM64_DMA_USE_IOMMU
struct dma_iommu_mapping *
arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size,
int order);
@ -32,5 +34,30 @@ int arm_iommu_attach_device(struct device *dev,
struct dma_iommu_mapping *mapping);
void arm_iommu_detach_device(struct device *dev);
#else /* !CONFIG_ARM64_DMA_USE_IOMMU */
static inline struct dma_iommu_mapping *
arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size,
int order)
{
return NULL;
}
static inline void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping)
{
}
static inline int arm_iommu_attach_device(struct device *dev,
struct dma_iommu_mapping *mapping)
{
return -ENODEV;
}
static inline void arm_iommu_detach_device(struct device *dev)
{
}
#endif /* CONFIG_ARM64_DMA_USE_IOMMU */
#endif /* __KERNEL__ */
#endif