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.
Signed-off-by: Hiroshi Doyu <[email protected]> --- drivers/iommu/tegra-smmu.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index 96dbef3..9018151 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -904,7 +904,18 @@ enum { static int smmu_iommu_add_device(struct device *dev) { int err; - struct dma_iommu_mapping *map = smmu_handle->map[SYSTEM_DEFAULT]; + u64 swgids; + struct dma_iommu_mapping *map = NULL; + + swgids = tegra_smmu_of_get_swgids(dev); + switch (swgids) { + case SWGID(PPCS): + map = smmu_handle->map[SYSTEM_PROTECTED]; + break; + default: + map = smmu_handle->map[SYSTEM_DEFAULT]; + break; + } if (!map) goto out; @@ -915,7 +926,7 @@ static int smmu_iommu_add_device(struct device *dev) return err; } out: - dev_dbg(dev, "Attached to map %p\n", map); + dev_dbg(dev, "Attached to map %p, swgids:%08llx\n", map, swgids); return 0; } -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
