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This protocol is used by the SMMUv3AEM model to identify the SSD, StreamID, and SubStreamID of an incoming transaction. It is only used if the parameter
howto_identify is set to
identify(unsigned tbu_number_, const pv::TransactionAttributes* attributes_, bool*
out_ssd_ns_, unsigned* out_streamid_, unsigned* out_substreamid_) :
Architecturally, a transaction comes into the SMMUv3AEM model with the following side band signals:
SubStreamID and SubStreamID valid.
If you set
*out_substreamid_ = ~0u, that is interpreted as
no SubStreamID because SubStreamIDs are 20 or fewer bits.
How these are transported in the system is SoC-dependent.
The SMMUv3AEM requires that the SoC provides a way of determining this information by