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    x86: Kill bad_dma_address variable · 8fd524b3
    FUJITA Tomonori 提交于
    This kills bad_dma_address variable, the old mechanism to enable
    IOMMU drivers to make dma_mapping_error() work in IOMMU's
    specific way.
    
    bad_dma_address variable was introduced to enable IOMMU drivers
    to make dma_mapping_error() work in IOMMU's specific way.
    However, it can't handle systems that use both swiotlb and HW
    IOMMU. SO we introduced dma_map_ops->mapping_error to solve that
    case.
    
    Intel VT-d, GART, and swiotlb already use
    dma_map_ops->mapping_error. Calgary, AMD IOMMU, and nommu use
    zero for an error dma address. This adds DMA_ERROR_CODE and
    converts them to use it (as SPARC and POWER does).
    Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
    Acked-by: NJesse Barnes <jbarnes@virtuousgeek.org>
    Cc: muli@il.ibm.com
    Cc: joerg.roedel@amd.com
    LKML-Reference: <1258287594-8777-3-git-send-email-fujita.tomonori@lab.ntt.co.jp>
    Signed-off-by: NIngo Molnar <mingo@elte.hu>
    8fd524b3
dma-mapping.h 3.8 KB