Revert power patch sets with unexpected interactions

The following patches had unexpected interactions with the current
upstream code and have been reverted for now:

e07fd01651f3: power: Add support for power models
831c7f2f9e39: power: Low-power idle power state for idle CPUs
4f749e00b667: power: Add power states to ClockedObject

Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>

--HG--
extra : amend_source : 0b6fb073c6bbc24be533ec431eb51fbf1b269508

2 files changed, 30 insertions, 17 deletions

diff --git a/src/mem/cache/prefetch/queued.cc b/src/mem/cache/prefetch/queued.cc
index 4bc75acd6..03ca3188f 100644
--- a/src/mem/cache/prefetch/queued.cc
+++ b/src/mem/cache/prefetch/queued.cc
@@ -122,7 +122,8 @@ QueuedPrefetcher::notify(const PacketPtr &pkt)
             pf_pkt->allocate();
 
             if (pkt->req->hasContextId()) {
-                pf_req->setContext(pkt->req->contextId());
+                pf_req->setThreadContext(pkt->req->contextId(),
+                                         pkt->req->threadId());
             }
 
             if (tagPrefetch && pkt->req->hasPC()) {
diff --git a/src/mem/request.hh b/src/mem/request.hh
index 90363ea66..0d2750a16 100644
--- a/src/mem/request.hh
+++ b/src/mem/request.hh
@@ -257,13 +257,14 @@ class Request
         VALID_PC             = 0x00000010,
         /** Whether or not the context ID is valid. */
         VALID_CONTEXT_ID     = 0x00000020,
+        VALID_THREAD_ID      = 0x00000040,
         /** Whether or not the sc result is valid. */
         VALID_EXTRA_DATA     = 0x00000080,
         /**
          * These flags are *not* cleared when a Request object is reused
          * (assigned a new address).
          */
-        STICKY_PRIVATE_FLAGS = VALID_CONTEXT_ID
+        STICKY_PRIVATE_FLAGS = VALID_CONTEXT_ID | VALID_THREAD_ID
     };
 
   private:
@@ -338,8 +339,10 @@ class Request
      * store conditional or the compare value for a CAS. */
     uint64_t _extraData;
 
-    /** The context ID (for statistics, locks, and wakeups). */
+    /** The context ID (for statistics, typically). */
     ContextID _contextId;
+    /** The thread ID (id within this CPU) */
+    ThreadID _threadId;
 
     /** program counter of initiating access; for tracing/debugging */
     Addr _pc;
@@ -360,21 +363,21 @@ class Request
     Request()
         : _paddr(0), _size(0), _masterId(invldMasterId), _time(0),
           _taskId(ContextSwitchTaskId::Unknown), _asid(0), _vaddr(0),
-          _extraData(0), _contextId(0), _pc(0),
+          _extraData(0), _contextId(0), _threadId(0), _pc(0),
           _reqInstSeqNum(0), atomicOpFunctor(nullptr), translateDelta(0),
           accessDelta(0), depth(0)
     {}
 
     Request(Addr paddr, unsigned size, Flags flags, MasterID mid,
-            InstSeqNum seq_num, ContextID cid)
+            InstSeqNum seq_num, ContextID cid, ThreadID tid)
         : _paddr(0), _size(0), _masterId(invldMasterId), _time(0),
           _taskId(ContextSwitchTaskId::Unknown), _asid(0), _vaddr(0),
-          _extraData(0), _contextId(0), _pc(0),
+          _extraData(0), _contextId(0), _threadId(0), _pc(0),
           _reqInstSeqNum(seq_num), atomicOpFunctor(nullptr), translateDelta(0),
           accessDelta(0), depth(0)
     {
         setPhys(paddr, size, flags, mid, curTick());
-        setContext(cid);
+        setThreadContext(cid, tid);
         privateFlags.set(VALID_INST_SEQ_NUM);
     }
 
@@ -386,7 +389,7 @@ class Request
     Request(Addr paddr, unsigned size, Flags flags, MasterID mid)
         : _paddr(0), _size(0), _masterId(invldMasterId), _time(0),
           _taskId(ContextSwitchTaskId::Unknown), _asid(0), _vaddr(0),
-          _extraData(0), _contextId(0), _pc(0),
+          _extraData(0), _contextId(0), _threadId(0), _pc(0),
           _reqInstSeqNum(0), atomicOpFunctor(nullptr), translateDelta(0),
           accessDelta(0), depth(0)
     {
@@ -396,7 +399,7 @@ class Request
     Request(Addr paddr, unsigned size, Flags flags, MasterID mid, Tick time)
         : _paddr(0), _size(0), _masterId(invldMasterId), _time(0),
           _taskId(ContextSwitchTaskId::Unknown), _asid(0), _vaddr(0),
-          _extraData(0), _contextId(0), _pc(0),
+          _extraData(0), _contextId(0), _threadId(0), _pc(0),
           _reqInstSeqNum(0), atomicOpFunctor(nullptr), translateDelta(0),
           accessDelta(0), depth(0)
     {
@@ -407,7 +410,7 @@ class Request
             Addr pc)
         : _paddr(0), _size(0), _masterId(invldMasterId), _time(0),
           _taskId(ContextSwitchTaskId::Unknown), _asid(0), _vaddr(0),
-          _extraData(0), _contextId(0), _pc(pc),
+          _extraData(0), _contextId(0), _threadId(0), _pc(pc),
           _reqInstSeqNum(0), atomicOpFunctor(nullptr), translateDelta(0),
           accessDelta(0), depth(0)
     {
@@ -416,15 +419,15 @@ class Request
     }
 
     Request(int asid, Addr vaddr, unsigned size, Flags flags, MasterID mid,
-            Addr pc, ContextID cid)
+            Addr pc, ContextID cid, ThreadID tid)
         : _paddr(0), _size(0), _masterId(invldMasterId), _time(0),
           _taskId(ContextSwitchTaskId::Unknown), _asid(0), _vaddr(0),
-          _extraData(0), _contextId(0), _pc(0),
+          _extraData(0), _contextId(0), _threadId(0), _pc(0),
           _reqInstSeqNum(0), atomicOpFunctor(nullptr), translateDelta(0),
           accessDelta(0), depth(0)
     {
         setVirt(asid, vaddr, size, flags, mid, pc);
-        setContext(cid);
+        setThreadContext(cid, tid);
     }
 
     Request(int asid, Addr vaddr, int size, Flags flags, MasterID mid, Addr pc,
@@ -432,7 +435,7 @@ class Request
         : atomicOpFunctor(atomic_op)
     {
         setVirt(asid, vaddr, size, flags, mid, pc);
-        setContext(cid);
+        setThreadContext(cid, tid);
     }
 
     ~Request()
@@ -443,13 +446,14 @@ class Request
     }
 
     /**
-     * Set up Context numbers.
+     * Set up CPU and thread numbers.
      */
     void
-    setContext(ContextID context_id)
+    setThreadContext(ContextID context_id, ThreadID tid)
     {
         _contextId = context_id;
-        privateFlags.set(VALID_CONTEXT_ID);
+        _threadId = tid;
+        privateFlags.set(VALID_CONTEXT_ID|VALID_THREAD_ID);
     }
 
     /**
@@ -697,6 +701,14 @@ class Request
         return _contextId;
     }
 
+    /** Accessor function for thread ID. */
+    ThreadID
+    threadId() const
+    {
+        assert(privateFlags.isSet(VALID_THREAD_ID));
+        return _threadId;
+    }
+
     void
     setPC(Addr pc)
     {