On 07/05/2013 04:44 AM, Hiroshi Doyu wrote:
> Support Multiple Address Space(AS). Tegra SMMU can have multiple
> ASes. We reserve 2 of them for static assignment, AS[0] for system
> default, AS[1] for AHB clusters as protected domain from others, where
> there are many traditional pheripheral devices like USB, SD/MMC. They
> should be isolated from some smart devices like host1x for system
> robustness. Even if smart devices behaves wrongly, the traditional
> devices(SD/MMC, USB) wouldn't be affected, and the system could
> continue most likely.
> diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
> static int smmu_iommu_add_device(struct device *dev)
> {
> int err;
> - struct dma_iommu_mapping *map = smmu_handle->map[SYSTEM_DEFAULT];
> + u64 swgroup;
> + struct dma_iommu_mapping *map = NULL;
> +
> + swgroup = smmu_of_get_memory_client(dev);
> + switch (swgroup) {
> + case TEGRA_SWGROUP_BIT(PPCS):
> + map = smmu_handle->map[SYSTEM_PROTECTED];
> + break;
> + default:
> + map = smmu_handle->map[SYSTEM_DEFAULT];
I already mentioned this, but just for completeness: What is
smmu->num_as <= SYSTEM_DEFAULT?
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