fastmodel: Implement ThreadContext::sendFunctional.

This change provides a custom implementation for the
ThreadContext::sendFunctional method.

Change-Id: Idffb4efc509dd63c852ada0768435bf653bd1854
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45862
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Yu-hsin Wang <yuhsingw@google.com>
Maintainer: Gabe Black <gabe.black@gmail.com>

src/arch/arm/fastmodel/iris/cpu.hh

@@ -38,6 +38,8 @@
 namespace Iris
 {
 
+class ThreadContext;
+
 // The base interface of the EVS used by gem5 BaseCPU below.
 class BaseCpuEvs
 {
@@ -93,6 +95,8 @@ class BaseCPU : public ::BaseCPU
     Iris::BaseCpuEvs *evs_base_cpu;
 
   protected:
+    friend ThreadContext;
+
     void
     clockPeriodUpdated() override
     {

src/arch/arm/fastmodel/iris/thread_context.cc

@@ -41,6 +41,7 @@
 
 #include <utility>
 
+#include "arch/arm/fastmodel/iris/cpu.hh"
 #include "arch/arm/system.hh"
 #include "arch/arm/utility.hh"
 #include "iris/detail/IrisCppAdapter.h"
@@ -304,7 +305,7 @@ ThreadContext::semihostingEvent(
 }
 
 ThreadContext::ThreadContext(
-        BaseCPU *cpu, int id, System *system, ::BaseMMU *mmu,
+        ::BaseCPU *cpu, int id, System *system, ::BaseMMU *mmu,
         BaseISA *isa, iris::IrisConnectionInterface *iris_if,
         const std::string &iris_path) :
     _cpu(cpu), _threadId(id), _system(system), _mmu(mmu), _isa(isa),
@@ -488,6 +489,14 @@ ThreadContext::initMemProxies(::ThreadContext *tc)
     }
 }
 
+void
+ThreadContext::sendFunctional(PacketPtr pkt)
+{
+    auto *iris_cpu = dynamic_cast<Iris::BaseCPU *>(getCpuPtr());
+    assert(iris_cpu);
+    iris_cpu->evs_base_cpu->sendFunc(pkt);
+}
+
 ThreadContext::Status
 ThreadContext::status() const
 {

src/arch/arm/fastmodel/iris/thread_context.hh

@@ -216,6 +216,8 @@ class ThreadContext : public ::ThreadContext
     PortProxy &getVirtProxy() override { return *virtProxy; }
     void initMemProxies(::ThreadContext *tc) override;
 
+    void sendFunctional(PacketPtr pkt) override;
+
     Process *
     getProcessPtr() override
     {