> > On Tegra, the following use cases need specific IOVA mapping. > > 1. Few MMIO blocks need IOVA=PA mapping setup. > > In that case, why would we enable the IOMMU for that one device; IOMMU > disabled means VA==PA, right? Perhaps isolation of the device so it can only > access certain PA ranges for security? The device(H/W controller) need to access few special memory blocks(IOVA==PA) and DRAM as well. If IOMMU is disabled, then it has to handle memory fragmentation, which defeats the purpose of IOMMU support. There is also a case where frame buffer memory is passed from BootLoader to Kernel and display H/W continues to access it with IOMMU enabled. To support this, the one to one mapping has to be setup before enabling IOMMU. -KR -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
