energy: Tighter checking of levels for DFS systems

There are cases where users might by accident / intention specify less voltage
operating points thatn frequency points.  We consider one of these cases
special: giving only a single voltage to a voltage domain effectively renders
it as a static domain.  This patch adds additional logic in the auxiliary parts
of the functionality to handle these cases properly (simple driver asking for
N>1 operating levels, we should return the same voltage for all of them) and
adds error checking code in the voltage domain.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/sim/voltage_domain.hh b/src/sim/voltage_domain.hh
index 9ffbe7bbc..ab96abad8 100644
--- a/src/sim/voltage_domain.hh
+++ b/src/sim/voltage_domain.hh
@@ -77,6 +77,10 @@ class VoltageDomain : public SimObject
      */
     double voltage(PerfLevel perf_level) const
     {
+        chatty_assert(perf_level < numVoltages(), "VoltageDomain %s "\
+                      "request for voltage perf level %u is outside "\
+                      "of numVoltages %u", name(), perf_level,
+                      numVoltages());
         return voltageOpPoints[perf_level];
     }