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In server system, we often use ACPI table in UEFI to stort parametres of system. For a PCIe subsystem, IORT table will be used to store configurations of ITS, SMMU and RC. This document analyzes how to parse ITS configuration in kernel.

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This document shares a code analysis based on Linux-v4.9 about how to parse SMMU information in ACPI IORT table, and how does a PCIe device get its SMMUv3 device.

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