power: Add power states to ClockedObject

Add 4 power states to the ClockedObject, provides necessary access functions
to check and update the power state. Default power state is UNDEFINED, it is
responsibility of the respective simulation model to provide the startup state
and any other logic for state change.

Add number of transition stat.
Add distribution of time spent in clock gated state.
Add power state residency stat.

Add dump call back function to allow stats update of distribution and residency
stats.

2 files changed, 6 insertions, 1 deletions

diff --git a/src/mem/ruby/system/RubySystem.hh b/src/mem/ruby/system/RubySystem.hh
index 62330e19d..8ebd3494a 100644
--- a/src/mem/ruby/system/RubySystem.hh
+++ b/src/mem/ruby/system/RubySystem.hh
@@ -89,7 +89,10 @@ class RubySystem : public ClockedObject
         return m_profiler;
     }
 
-    void regStats() override { m_profiler->regStats(name()); }
+    void regStats() override {
+        ClockedObject::regStats();
+        m_profiler->regStats(name());
+    }
     void collateStats() { m_profiler->collateStats(); }
     void resetStats() override;
 
diff --git a/src/mem/ruby/system/Sequencer.cc b/src/mem/ruby/system/Sequencer.cc
index dedade3cf..fbaad8407 100644
--- a/src/mem/ruby/system/Sequencer.cc
+++ b/src/mem/ruby/system/Sequencer.cc
@@ -688,6 +688,8 @@ Sequencer::evictionCallback(Addr address)
 void
 Sequencer::regStats()
 {
+    RubyPort::regStats();
+
     m_store_waiting_on_load
         .name(name() + ".store_waiting_on_load")
         .desc("Number of times a store aliased with a pending load")