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.

5 files changed, 56 insertions, 79 deletions

diff --git a/src/cpu/o3/cpu.cc b/src/cpu/o3/cpu.cc
index 73174e4a9..9bda09bf8 100644
--- a/src/cpu/o3/cpu.cc
+++ b/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;
 
diff --git a/src/cpu/simple_thread.cc b/src/cpu/simple_thread.cc
index 33c5b47ea..0e17c07b5 100644
--- a/src/cpu/simple_thread.cc
+++ b/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,
diff --git a/src/cpu/thread_context.cc b/src/cpu/thread_context.cc
index 01ea51f26..691465996 100644
--- a/src/cpu/thread_context.cc
+++ b/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
@@ -104,6 +107,39 @@ 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)
 {
     using namespace TheISA;
diff --git a/src/cpu/thread_context.hh b/src/cpu/thread_context.hh
index 2544b19c6..f966c0aa1 100644
--- a/src/cpu/thread_context.hh
+++ b/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)
diff --git a/src/sim/pseudo_inst.cc b/src/sim/pseudo_inst.cc
index 8f20c5ff9..4f9bbff6e 100644
--- a/src/sim/pseudo_inst.cc
+++ b/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;