arch-arm: Do not check MustBeOne flag for TLB requests from the prefetcher

[gem5.git] / src / mem / tport.cc

diff --git a/src/mem/tport.cc b/src/mem/tport.cc
index 2644a504c3bb76be40736df41dff4ab9fb7576f9..4de495e22f6d376ea65b547437ebc95384d70a0a 100644 (file)
--- a/src/mem/tport.cc
+++ b/src/mem/tport.cc
@@ -1,4 +1,16 @@
 /*
+ * Copyright (c) 2012 ARM Limited
+ * All rights reserved.
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
  * Copyright (c) 2006 The Regents of The University of Michigan
  * All rights reserved.
  *
@@ -26,151 +38,49 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Authors: Ali Saidi
+ *          Andreas Hansson
  */
 
 #include "mem/tport.hh"
+#include "sim/sim_object.hh"
 
-void
-SimpleTimingPort::checkFunctional(PacketPtr pkt)
+SimpleTimingPort::SimpleTimingPort(const std::string& _name,
+                                   SimObject* _owner) :
+    QueuedSlavePort(_name, _owner, queueImpl), queueImpl(*_owner, *this)
 {
-    DeferredPacketIterator i = transmitList.begin();
-    DeferredPacketIterator end = transmitList.end();
-
-    for (; i != end; ++i) {
-        PacketPtr target = i->pkt;
-        // If the target contains data, and it overlaps the
-        // probed request, need to update data
-        if (target->intersect(pkt)) {
-            if (!fixPacket(pkt, target)) {
-                // fixPacket returns true for continue, false for done
-                return;
-            }
-        }
-    }
 }
 
 void
 SimpleTimingPort::recvFunctional(PacketPtr pkt)
 {
-    checkFunctional(pkt);
-
-    // Just do an atomic access and throw away the returned latency
-    if (pkt->result != Packet::Success)
+    if (!respQueue.trySatisfyFunctional(pkt)) {
+        // do an atomic access and throw away the returned latency
         recvAtomic(pkt);
+    }
 }
 
 bool
-SimpleTimingPort::recvTiming(PacketPtr pkt)
+SimpleTimingPort::recvTimingReq(PacketPtr pkt)
 {
-    // If the device is only a slave, it should only be sending
-    // responses, which should never get nacked.  There used to be
-    // code to hanldle nacks here, but I'm pretty sure it didn't work
-    // correctly with the drain code, so that would need to be fixed
-    // if we ever added it back.
-    assert(pkt->isRequest());
-    assert(pkt->result == Packet::Unknown);
+    // the SimpleTimingPort should not be used anywhere where there is
+    // a need to deal with snoop responses and their flow control
+    // requirements
+    if (pkt->cacheResponding())
+        panic("SimpleTimingPort should never see packets with the "
+              "cacheResponding flag set\n");
+
     bool needsResponse = pkt->needsResponse();
     Tick latency = recvAtomic(pkt);
     // turn packet around to go back to requester if response expected
     if (needsResponse) {
-        // recvAtomic() should already have turned packet into atomic response
+        // recvAtomic() should already have turned packet into
+        // atomic response
         assert(pkt->isResponse());
-        pkt->convertAtomicToTimingResponse();
-        schedSendTiming(pkt, curTick + latency);
+        schedTimingResp(pkt, curTick() + latency);
     } else {
-        delete pkt->req;
-        delete pkt;
-    }
-    return true;
-}
-
-
-void
-SimpleTimingPort::schedSendTiming(PacketPtr pkt, Tick when)
-{
-    assert(when > curTick);
-
-    // Nothing is on the list: add it and schedule an event
-    if (transmitList.empty()) {
-        assert(!sendEvent->scheduled());
-        sendEvent->schedule(when);
-        transmitList.push_back(DeferredPacket(when, pkt));
-        return;
-    }
-
-    // something is on the list and this belongs at the end
-    if (when >= transmitList.back().tick) {
-        transmitList.push_back(DeferredPacket(when, pkt));
-        return;
-    }
-    // Something is on the list and this belongs somewhere else
-    DeferredPacketIterator i = transmitList.begin();
-    DeferredPacketIterator end = transmitList.end();
-
-    for (; i != end; ++i) {
-        if (when < i->tick) {
-            if (i == transmitList.begin()) {
-                //Inserting at begining, reschedule
-                sendEvent->reschedule(when);
-            }
-            transmitList.insert(i, DeferredPacket(when, pkt));
-            return;
-        }
-    }
-    assert(false); // should never get here
-}
-
-
-void
-SimpleTimingPort::sendDeferredPacket()
-{
-    assert(deferredPacketReady());
-    bool success = sendTiming(transmitList.front().pkt);
-
-    if (success) {
-        //send successful, remove packet
-        transmitList.pop_front();
-        if (!transmitList.empty()) {
-            Tick time = transmitList.front().tick;
-            sendEvent->schedule(time <= curTick ? curTick+1 : time);
-        }
-
-        if (transmitList.empty() && drainEvent) {
-            drainEvent->process();
-            drainEvent = NULL;
-        }
+        // queue the packet for deletion
+        pendingDelete.reset(pkt);
     }
 
-    waitingOnRetry = !success;
-
-    if (waitingOnRetry) {
-        DPRINTF(Bus, "Send failed, waiting on retry\n");
-    }
-}
-
-
-void
-SimpleTimingPort::recvRetry()
-{
-    DPRINTF(Bus, "Received retry\n");
-    assert(waitingOnRetry);
-    sendDeferredPacket();
-}
-
-
-void
-SimpleTimingPort::processSendEvent()
-{
-    assert(!waitingOnRetry);
-    sendDeferredPacket();
-}
-
-
-unsigned int
-SimpleTimingPort::drain(Event *de)
-{
-    if (transmitList.size() == 0)
-        return 0;
-    drainEvent = de;
-    return 1;
+    return true;
 }