power: Low-power idle power state for idle CPUs

Add functionality to the BaseCPU that will put the entire CPU into a low-power
idle state whenever all threads in it are idle.

6 files changed, 45 insertions, 2 deletions

diff --git a/src/cpu/base.cc b/src/cpu/base.cc
index 624843f42..0f9fe49ea 100644
--- a/src/cpu/base.cc
+++ b/src/cpu/base.cc
@@ -64,6 +64,7 @@
 #include "debug/SyscallVerbose.hh"
 #include "mem/page_table.hh"
 #include "params/BaseCPU.hh"
+#include "sim/clocked_object.hh"
 #include "sim/full_system.hh"
 #include "sim/process.hh"
 #include "sim/sim_events.hh"
@@ -355,6 +356,11 @@ BaseCPU::startup()
     if (params()->progress_interval) {
         new CPUProgressEvent(this, params()->progress_interval);
     }
+
+    // Assumption CPU start to operate instantaneously without any latency
+    if (ClockedObject::pwrState() == Enums::PwrState::UNDEFINED)
+        ClockedObject::pwrState(Enums::PwrState::ON);
+
 }
 
 ProbePoints::PMUUPtr
@@ -473,6 +479,27 @@ BaseCPU::findContext(ThreadContext *tc)
 }
 
 void
+BaseCPU::activateContext(ThreadID thread_num)
+{
+    // For any active thread running, update CPU power state to active (ON)
+    ClockedObject::pwrState(Enums::PwrState::ON);
+}
+
+void
+BaseCPU::suspendContext(ThreadID thread_num)
+{
+    // Check if all threads are suspended
+    for (auto t : threadContexts) {
+        if (t->status() != ThreadContext::Suspended) {
+            return;
+        }
+    }
+
+    // All CPU threads suspended, enter lower power state for the CPU
+    ClockedObject::pwrState(Enums::PwrState::CLK_GATED);
+}
+
+void
 BaseCPU::switchOut()
 {
     assert(!_switchedOut);
diff --git a/src/cpu/base.hh b/src/cpu/base.hh
index 438c38812..f01aa71f3 100644
--- a/src/cpu/base.hh
+++ b/src/cpu/base.hh
@@ -279,10 +279,11 @@ class BaseCPU : public MemObject
     Trace::InstTracer * getTracer() { return tracer; }
 
     /// Notify the CPU that the indicated context is now active.
-    virtual void activateContext(ThreadID thread_num) {}
+    virtual void activateContext(ThreadID thread_num);
 
     /// Notify the CPU that the indicated context is now suspended.
-    virtual void suspendContext(ThreadID thread_num) {}
+    /// Check if possible to enter a lower power state
+    virtual void suspendContext(ThreadID thread_num);
 
     /// Notify the CPU that the indicated context is now halted.
     virtual void haltContext(ThreadID thread_num) {}
diff --git a/src/cpu/minor/cpu.cc b/src/cpu/minor/cpu.cc
index cd39a8b93..a707c6045 100644
--- a/src/cpu/minor/cpu.cc
+++ b/src/cpu/minor/cpu.cc
@@ -287,6 +287,8 @@ MinorCPU::activateContext(ThreadID thread_id)
     threads[thread_id]->activate();
     wakeupOnEvent(Minor::Pipeline::CPUStageId);
     pipeline->wakeupFetch();
+
+    BaseCPU::activateContext(thread_id);
 }
 
 void
@@ -295,6 +297,8 @@ MinorCPU::suspendContext(ThreadID thread_id)
     DPRINTF(MinorCPU, "SuspendContext %d\n", thread_id);
 
     threads[thread_id]->suspend();
+
+    BaseCPU::suspendContext(thread_id);
 }
 
 void
diff --git a/src/cpu/o3/cpu.cc b/src/cpu/o3/cpu.cc
index 79ad705bf..73174e4a9 100644
--- a/src/cpu/o3/cpu.cc
+++ b/src/cpu/o3/cpu.cc
@@ -735,6 +735,8 @@ FullO3CPU<Impl>::activateContext(ThreadID tid)
         lastActivatedCycle = curTick();
 
         _status = Running;
+
+        BaseCPU::activateContext(tid);
     }
 }
 
@@ -755,6 +757,8 @@ FullO3CPU<Impl>::suspendContext(ThreadID tid)
     }
 
     DPRINTF(Quiesce, "Suspending Context\n");
+
+    BaseCPU::suspendContext(tid);
 }
 
 template <class Impl>
diff --git a/src/cpu/simple/atomic.cc b/src/cpu/simple/atomic.cc
index f3e14d401..3cd6c1666 100644
--- a/src/cpu/simple/atomic.cc
+++ b/src/cpu/simple/atomic.cc
@@ -247,6 +247,8 @@ AtomicSimpleCPU::activateContext(ThreadID thread_num)
         == activeThreads.end()) {
         activeThreads.push_back(thread_num);
     }
+
+    BaseCPU::activateContext(thread_num);
 }
 
 
@@ -273,6 +275,7 @@ AtomicSimpleCPU::suspendContext(ThreadID thread_num)
         }
     }
 
+    BaseCPU::suspendContext(thread_num);
 }
 
 
diff --git a/src/cpu/simple/timing.cc b/src/cpu/simple/timing.cc
index 43f4eb9f4..c99f9c475 100644
--- a/src/cpu/simple/timing.cc
+++ b/src/cpu/simple/timing.cc
@@ -218,6 +218,8 @@ TimingSimpleCPU::activateContext(ThreadID thread_num)
          == activeThreads.end()) {
         activeThreads.push_back(thread_num);
     }
+
+    BaseCPU::activateContext(thread_num);
 }
 
 
@@ -243,6 +245,8 @@ TimingSimpleCPU::suspendContext(ThreadID thread_num)
             deschedule(fetchEvent);
         }
     }
+
+    BaseCPU::suspendContext(thread_num);
 }
 
 bool