On Sat, Apr 26, 2014 at 03:28:37PM +0100, Ritesh Harjani wrote:
> Hi Guys,
>
> Need again some help in deciding which all functions/Data structures
> needs to be moved out from arch/arm/mm/dma-mapping to
> lib/iommu-helper.c.
>
> 1. There is this dma_iommu_mapping structure defination in
> arch/arm/include/asm/dma-iommu.h. In arm this structure is declared as
> "mapping" which is part of dev_archdata structure, which is used for
> IOVA management.
> Now, does this make sense to move this structure out to
> include/linux/iommu-helper.h ? And define a config like
> CONFIG_IOMMU_USE_HELPER_MAPPING (default n) which will be used to,
> have a variable("mapping") defined or not in dev_archdata of all
> archs.
In that case, wouldn't it make more sense to put the DMA mapping information
in the struct device itself, rather than the dev_archdata? The CMA data, for
example, is stored directly there.
Will
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