style: [patch 3/22] reduce include dependencies in some headers

Used cppclean to help identify useless includes and removed them. This
involved erroneously included headers, but also cases where forward
declarations could have been used rather than a full include.

src/sim/dvfs_handler.cc

@@ -45,9 +45,11 @@
 #include <utility>
 
 #include "base/misc.hh"
+#include "base/trace.hh"
 #include "debug/DVFS.hh"
 #include "params/DVFSHandler.hh"
 #include "sim/clock_domain.hh"
+#include "sim/eventq_impl.hh"
 #include "sim/stat_control.hh"
 #include "sim/voltage_domain.hh"
 
@@ -170,6 +172,30 @@ DVFSHandler::UpdateEvent::updatePerfLevel()
     d->perfLevel(perfLevelToSet);
 }
 
+double
+DVFSHandler::voltageAtPerfLevel(DomainID domain_id, PerfLevel perf_level) const
+{
+    VoltageDomain *d = findDomain(domain_id)->voltageDomain();
+    assert(d);
+    PerfLevel n = d->numVoltages();
+    if (perf_level < n)
+        return d->voltage(perf_level);
+
+    // Request outside of the range of the voltage domain
+    if (n == 1) {
+        DPRINTF(DVFS, "DVFS: Request for perf-level %i for single-point "\
+                "voltage domain %s.  Returning voltage at level 0: %.2f "\
+                "V\n", perf_level, d->name(), d->voltage(0));
+        // Special case for single point voltage domain -> same voltage for
+        // all points
+        return d->voltage(0);
+    }
+
+    warn("DVFSHandler %s reads illegal voltage level %u from "\
+         "VoltageDomain %s. Returning 0 V\n", name(), perf_level, d->name());
+    return 0.;
+}
+
 void
 DVFSHandler::serialize(CheckpointOut &cp) const
 {