systemc: Add the stream id entry and its conversion in control extension

stream id and substream id are properties of gem5 Request. This CL adds
the information into gem5 ControlExtension to manipulate them in SystemC
level, and adds the conversion between ControlExtension and Packet.

Change-Id: Id13d181561ba496c2012f7237eb800f0a9786d05
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/65371
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Yu-hsin Wang <yuhsingw@google.com>

src/systemc/tlm_bridge/sc_ext.cc

@@ -33,6 +33,8 @@
 
 #include "systemc/tlm_bridge/sc_ext.hh"
 
+#include <optional>
+
 #include "systemc/ext/utils/sc_report_handler.hh"
 #include "systemc/tlm_bridge/gem5_to_tlm.hh"
 #include "systemc/tlm_bridge/tlm_to_gem5.hh"
@@ -76,6 +78,14 @@ struct ControlConversionRegister
                 }
 
                 pkt->qosValue(control_ex->getQos());
+
+                if (control_ex->hasStreamId()) {
+                    pkt->req->setStreamId(control_ex->getStreamId().value());
+                }
+                if (control_ex->hasSubstreamId()) {
+                    pkt->req->setSubstreamId(
+                        control_ex->getSubstreamId().value());
+                }
             });
         sc_gem5::addPacketToPayloadConversionStep(
             [] (PacketPtr pkt, tlm::tlm_generic_payload &trans)
@@ -90,6 +100,12 @@ struct ControlConversionRegister
                 control_ex->setSecure(pkt->req->isSecure());
                 control_ex->setInstruction(pkt->req->isInstFetch());
                 control_ex->setQos(pkt->qosValue());
+                if (pkt->req->hasStreamId()) {
+                    control_ex->setStreamId(pkt->req->streamId());
+                }
+                if (pkt->req->hasSubstreamId()) {
+                    control_ex->setSubstreamId(pkt->req->substreamId());
+                }
             });
     }
 };
@@ -263,4 +279,40 @@ ControlExtension::setQos(uint8_t q)
     qos = q;
 }
 
-} // namespace Gem5SystemC
+bool
+ControlExtension::hasStreamId() const
+{
+    return stream_id.has_value();
+}
+
+std::optional<uint32_t>
+ControlExtension::getStreamId() const
+{
+    return stream_id;
+}
+
+void
+ControlExtension::setStreamId(std::optional<uint32_t> s)
+{
+    stream_id = std::move(s);
+}
+
+bool
+ControlExtension::hasSubstreamId() const
+{
+    return substream_id.has_value();
+}
+
+std::optional<uint32_t>
+ControlExtension::getSubstreamId() const
+{
+    return substream_id;
+}
+
+void
+ControlExtension::setSubstreamId(std::optional<uint32_t> s)
+{
+    substream_id = std::move(s);
+}
+
+}  // namespace Gem5SystemC

src/systemc/tlm_bridge/sc_ext.hh

@@ -36,6 +36,7 @@
 
 #include <cstdint>
 #include <memory>
+#include <optional>
 
 #include "base/amo.hh"
 #include "mem/packet.hh"
@@ -115,6 +116,14 @@ class ControlExtension : public tlm::tlm_extension<ControlExtension>
     uint8_t getQos() const;
     void setQos(uint8_t q);
 
+    /* Stream ID and Substream ID */
+    bool hasStreamId() const;
+    std::optional<uint32_t> getStreamId() const;
+    void setStreamId(std::optional<uint32_t> s);
+    bool hasSubstreamId() const;
+    std::optional<uint32_t> getSubstreamId() const;
+    void setSubstreamId(std::optional<uint32_t> s);
+
   private:
     /* Secure and privileged access */
     bool privileged;
@@ -123,6 +132,10 @@ class ControlExtension : public tlm::tlm_extension<ControlExtension>
 
     /* Quality of Service (AXI4) */
     uint8_t qos;
+
+    /* Stream ID and Substream ID */
+    std::optional<uint32_t> stream_id;
+    std::optional<uint32_t> substream_id;
 };
 
 } // namespace Gem5SystemC