• Marek Szyprowski's avatar
    arm: dma-mapping: remove order parameter from arm_iommu_create_mapping() · 68efd7d2
    Marek Szyprowski authored
    The 'order' parameter for IOMMU-aware dma-mapping implementation was
    introduced mainly as a hack to reduce size of the bitmap used for
    tracking IO virtual address space. Since now it is possible to dynamically
    resize the bitmap, this hack is not needed and can be removed without any
    impact on the client devices. This way the parameters for
    arm_iommu_create_mapping() becomes much easier to understand. 'size'
    parameter now means the maximum supported IO address space size.
    
    The code will allocate (resize) bitmap in chunks, ensuring that a single
    chunk is not larger than a single memory page to avoid unreliable
    allocations of size larger than PAGE_SIZE in atomic context.
    Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
    68efd7d2
exynos_drm_iommu.c 3.46 KB