sim: Refactor quiesce and remove FS asserts

The quiesce family of magic ops can be simplified by the inclusion of
quiesceTick() and quiesce() functions on ThreadContext.  This patch also
gets rid of the FS guards, since suspending a CPU is also a valid
operation for SE mode.

src/cpu/o3/cpu.cc

@@ -380,10 +380,9 @@ FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params)
         assert(o3_tc->cpu);
         o3_tc->thread = this->thread[tid];
 
-        if (FullSystem) {
-            // Setup quiesce event.
-            this->thread[tid]->quiesceEvent = new EndQuiesceEvent(tc);
-        }
+        // Setup quiesce event.
+        this->thread[tid]->quiesceEvent = new EndQuiesceEvent(tc);
+
         // Give the thread the TC.
         this->thread[tid]->tc = tc;
 

src/cpu/simple_thread.cc

@@ -69,6 +69,7 @@ SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num, System *_sys,
 {
     clearArchRegs();
     tc = new ProxyThreadContext<SimpleThread>(this);
+    quiesceEvent = new EndQuiesceEvent(tc);
 }
 
 SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num, System *_sys,

src/cpu/thread_context.cc

@@ -41,6 +41,7 @@
  * Authors: Kevin Lim
  */
 
+#include "arch/kernel_stats.hh"
 #include "base/misc.hh"
 #include "base/trace.hh"
 #include "config/the_isa.hh"
@@ -48,6 +49,8 @@
 #include "cpu/quiesce_event.hh"
 #include "cpu/thread_context.hh"
 #include "debug/Context.hh"
+#include "debug/Quiesce.hh"
+#include "params/BaseCPU.hh"
 #include "sim/full_system.hh"
 
 void
@@ -103,6 +106,39 @@ ThreadContext::compare(ThreadContext *one, ThreadContext *two)
 
 }
 
+void
+ThreadContext::quiesce()
+{
+    if (!getCpuPtr()->params()->do_quiesce)
+        return;
+
+    DPRINTF(Quiesce, "%s: quiesce()\n", getCpuPtr()->name());
+
+    suspend();
+    if (getKernelStats())
+       getKernelStats()->quiesce();
+}
+
+
+void
+ThreadContext::quiesceTick(Tick resume)
+{
+    BaseCPU *cpu = getCpuPtr();
+
+    if (!cpu->params()->do_quiesce)
+        return;
+
+    EndQuiesceEvent *quiesceEvent = getQuiesceEvent();
+
+    cpu->reschedule(quiesceEvent, resume, true);
+
+    DPRINTF(Quiesce, "%s: quiesceTick until %lu\n", cpu->name(), resume);
+
+    suspend();
+    if (getKernelStats())
+        getKernelStats()->quiesce();
+}
+
 void
 serialize(ThreadContext &tc, CheckpointOut &cp)
 {

src/cpu/thread_context.hh

@@ -174,6 +174,12 @@ class ThreadContext
     /// Set the status to Halted.
     virtual void halt() = 0;
 
+    /// Quiesce thread context
+    void quiesce();
+
+    /// Quiesce, suspend, and schedule activate at resume
+    void quiesceTick(Tick resume);
+
     virtual void dumpFuncProfile() = 0;
 
     virtual void takeOverFrom(ThreadContext *old_context) = 0;
@@ -367,6 +373,12 @@ class ProxyThreadContext : public ThreadContext
     /// Set the status to Halted.
     void halt() { actualTC->halt(); }
 
+    /// Quiesce thread context
+    void quiesce() { actualTC->quiesce(); }
+
+    /// Quiesce, suspend, and schedule activate at resume
+    void quiesceTick(Tick resume) { actualTC->quiesceTick(resume); }
+
     void dumpFuncProfile() { actualTC->dumpFuncProfile(); }
 
     void takeOverFrom(ThreadContext *oldContext)

src/sim/pseudo_inst.cc

@@ -234,105 +234,34 @@ void
 quiesce(ThreadContext *tc)
 {
     DPRINTF(PseudoInst, "PseudoInst::quiesce()\n");
-    if (!FullSystem)
-        panicFsOnlyPseudoInst("quiesce");
-
-    if (!tc->getCpuPtr()->params()->do_quiesce)
-        return;
-
-    DPRINTF(Quiesce, "%s: quiesce()\n", tc->getCpuPtr()->name());
-
-    tc->suspend();
-    if (tc->getKernelStats())
-        tc->getKernelStats()->quiesce();
+    tc->quiesce();
 }
 
 void
 quiesceSkip(ThreadContext *tc)
 {
     DPRINTF(PseudoInst, "PseudoInst::quiesceSkip()\n");
-    if (!FullSystem)
-        panicFsOnlyPseudoInst("quiesceSkip");
-
-    BaseCPU *cpu = tc->getCpuPtr();
-
-    if (!cpu->params()->do_quiesce)
-        return;
-
-    EndQuiesceEvent *quiesceEvent = tc->getQuiesceEvent();
-
-    Tick resume = cpu->nextCycle() + 1;
-
-    cpu->reschedule(quiesceEvent, resume, true);
-
-    DPRINTF(Quiesce, "%s: quiesceSkip() until %d\n",
-            cpu->name(), resume);
-
-    tc->suspend();
-    if (tc->getKernelStats())
-        tc->getKernelStats()->quiesce();
+    tc->quiesceTick(tc->getCpuPtr()->nextCycle() + 1);
 }
 
 void
 quiesceNs(ThreadContext *tc, uint64_t ns)
 {
     DPRINTF(PseudoInst, "PseudoInst::quiesceNs(%i)\n", ns);
-    if (!FullSystem)
-        panicFsOnlyPseudoInst("quiesceNs");
-
-    BaseCPU *cpu = tc->getCpuPtr();
-
-    if (!cpu->params()->do_quiesce)
-        return;
-
-    EndQuiesceEvent *quiesceEvent = tc->getQuiesceEvent();
-
-    Tick resume = curTick() + SimClock::Int::ns * ns;
-
-    cpu->reschedule(quiesceEvent, resume, true);
-
-    DPRINTF(Quiesce, "%s: quiesceNs(%d) until %d\n",
-            cpu->name(), ns, resume);
-
-    tc->suspend();
-    if (tc->getKernelStats())
-        tc->getKernelStats()->quiesce();
+    tc->quiesceTick(curTick() + SimClock::Int::ns * ns);
 }
 
 void
 quiesceCycles(ThreadContext *tc, uint64_t cycles)
 {
     DPRINTF(PseudoInst, "PseudoInst::quiesceCycles(%i)\n", cycles);
-    if (!FullSystem)
-        panicFsOnlyPseudoInst("quiesceCycles");
-
-    BaseCPU *cpu = tc->getCpuPtr();
-
-    if (!cpu->params()->do_quiesce)
-        return;
-
-    EndQuiesceEvent *quiesceEvent = tc->getQuiesceEvent();
-
-    Tick resume = cpu->clockEdge(Cycles(cycles));
-
-    cpu->reschedule(quiesceEvent, resume, true);
-
-    DPRINTF(Quiesce, "%s: quiesceCycles(%d) until %d\n",
-            cpu->name(), cycles, resume);
-
-    tc->suspend();
-    if (tc->getKernelStats())
-        tc->getKernelStats()->quiesce();
+    tc->quiesceTick(tc->getCpuPtr()->clockEdge(Cycles(cycles)));
 }
 
 uint64_t
 quiesceTime(ThreadContext *tc)
 {
     DPRINTF(PseudoInst, "PseudoInst::quiesceTime()\n");
-    if (!FullSystem) {
-        panicFsOnlyPseudoInst("quiesceTime");
-        return 0;
-    }
 
     return (tc->readLastActivate() - tc->readLastSuspend()) /
         SimClock::Int::ns;