On Sat, Jul 11, 2020 at 02:48:43PM +0800, Yong Wu wrote: > Some HW IP(ex: CCU) require the special iova range. That means the > iova got from dma_alloc_attrs for that devices must locate in his > special range. In this patch, we allocate a special iova_range for > each a special requirement and create each a iommu domain for each > a iova_range. > > meanwhile we still use one pagetable which support 16GB iova. > > After this patch, If the iova range of a master is over 4G, the master > should: > a) Declare its special dma_ranges in its dtsi node. For example, If we > preassign the iova 4G-8G for vcodec, then the vcodec dtsi node should: > dma-ranges = <0x1 0x0 0x1 0x0 0x1 0x0>; /* 4G ~ 8G */ BTW, dma-ranges should be in the parent node of the vcodec. > b) Update the dma_mask: > dma_set_mask_and_coherent(dev, DMA_BIT_MASK(33)); This should happen for you automatically. The DMA PFN offset should also be 4GB here. > > Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx> > --- > drivers/iommu/mtk_iommu.c | 49 ++++++++++++++++++++++++++++++++------- > drivers/iommu/mtk_iommu.h | 3 ++- > 2 files changed, 42 insertions(+), 10 deletions(-)
