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This patch is learn from Marek Szyprowski's patch: (drm/exynos: rewrite IOMMU support code) The patch replaces usage of ARM-specific IOMMU/DMA-mapping related calls with new generic code for managing DMA-IOMMU integration layer. It also removes all the hacks, which were needed to configure common DMA/IO address space on the virtual rockchip-drm device. Change-Id: I5d2b90002bf135a72ce30cc8503a7d06769835f3 Signed-off-by: Mark Yao <mark.yao@rock-chips.com>