cpu: Probe points for basic PMU stats

This changeset adds probe points that can be used to implement PMU
counters for CPU stats. The following probes are supported:

  * BaseCPU::ppCycles / Cycles
  * BaseCPU::ppRetiredInsts / RetiredInsts
  * BaseCPU::ppRetiredLoads / RetiredLoads
  * BaseCPU::ppRetiredStores / RetiredStores
  * BaseCPU::ppRetiredBranches RetiredBranches

1 files changed, 36 insertions, 0 deletions

diff --git a/src/cpu/base.cc b/src/cpu/base.cc
index c8c8ac571..ea4df2aa8 100644
--- a/src/cpu/base.cc
+++ b/src/cpu/base.cc
@@ -283,6 +283,42 @@ BaseCPU::startup()
     }
 }
 
+ProbePoints::PMUUPtr
+BaseCPU::pmuProbePoint(const char *name)
+{
+    ProbePoints::PMUUPtr ptr;
+    ptr.reset(new ProbePoints::PMU(getProbeManager(), name));
+
+    return ptr;
+}
+
+void
+BaseCPU::regProbePoints()
+{
+    ppCycles = pmuProbePoint("Cycles");
+
+    ppRetiredInsts = pmuProbePoint("RetiredInsts");
+    ppRetiredLoads = pmuProbePoint("RetiredLoads");
+    ppRetiredStores = pmuProbePoint("RetiredStores");
+    ppRetiredBranches = pmuProbePoint("RetiredBranches");
+}
+
+void
+BaseCPU::probeInstCommit(const StaticInstPtr &inst)
+{
+    if (!inst->isMicroop() || inst->isLastMicroop())
+        ppRetiredInsts->notify(1);
+
+
+    if (inst->isLoad())
+        ppRetiredLoads->notify(1);
+
+    if (inst->isStore())
+        ppRetiredLoads->notify(1);
+
+    if (inst->isControl())
+        ppRetiredBranches->notify(1);
+}
 
 void
 BaseCPU::regStats()