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    Subject[PATCH 08/29] ARM: dma-mapping: add helpers for managing default per-device dma mappings
    Date
    This patch adds 2 helpers: arm_iommu_create_default_mapping and
    arm_iommu_release_default_mapping for managing default iommu-based
    dma-mapping address space, created for exlusive use only by the given
    device. Those helpers are convenient for setting up iommu-based
    dma-mapping for most typical devices in the system.

    Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
    ---
    arch/arm/include/asm/dma-iommu.h | 5 +++++
    arch/arm/mm/dma-mapping.c | 31 +++++++++++++++++++++++++++++++
    2 files changed, 36 insertions(+)

    diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h
    index 8e3fcb9..ae3dac0 100644
    --- a/arch/arm/include/asm/dma-iommu.h
    +++ b/arch/arm/include/asm/dma-iommu.h
    @@ -33,5 +33,10 @@ int arm_iommu_attach_device(struct device *dev,
    struct dma_iommu_mapping *mapping);
    void arm_iommu_detach_device(struct device *dev);

    +int arm_iommu_create_default_mapping(struct device *dev, dma_addr_t base,
    + size_t size);
    +
    +void arm_iommu_release_default_mapping(struct device *dev);
    +
    #endif /* __KERNEL__ */
    #endif
    diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
    index 8161102..233a8cf 100644
    --- a/arch/arm/mm/dma-mapping.c
    +++ b/arch/arm/mm/dma-mapping.c
    @@ -2106,4 +2106,35 @@ void arm_iommu_detach_device(struct device *dev)
    }
    EXPORT_SYMBOL_GPL(arm_iommu_detach_device);

    +int arm_iommu_create_default_mapping(struct device *dev, dma_addr_t base,
    + size_t size)
    +{
    + struct dma_iommu_mapping *mapping;
    + int ret;
    +
    + mapping = arm_iommu_create_mapping(dev->bus, base, size);
    + if (IS_ERR(mapping))
    + return PTR_ERR(mapping);
    +
    + ret = arm_iommu_attach_device(dev, mapping);
    + if (ret) {
    + arm_iommu_release_mapping(mapping);
    + return ret;
    + }
    +
    + return 0;
    +}
    +EXPORT_SYMBOL_GPL(arm_iommu_create_default_mapping);
    +
    +void arm_iommu_release_default_mapping(struct device *dev)
    +{
    + struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
    + if (!mapping)
    + return;
    +
    + arm_iommu_detach_device(dev);
    + arm_iommu_release_mapping(mapping);
    +}
    +EXPORT_SYMBOL_GPL(arm_iommu_release_default_mapping);
    +
    #endif
    --
    1.9.2


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