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 55a461a8b5182f6e4b5d6aeab37e5be197be477d..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.
  *
@@ -26,108 +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"
+
+SimpleTimingPort::SimpleTimingPort(const std::string& _name,
+                                   SimObject* _owner) :
+    QueuedSlavePort(_name, _owner, queueImpl), queueImpl(*_owner, *this)
+{
+}
 
 void
 SimpleTimingPort::recvFunctional(PacketPtr pkt)
 {
-    std::list<PacketPtr>::iterator i = transmitList.begin();
-    std::list<PacketPtr>::iterator end = transmitList.end();
-
-    while (i != end) {
-        PacketPtr target = *i;
-        // If the target contains data, and it overlaps the
-        // probed request, need to update data
-        if (target->intersect(pkt))
-            fixPacket(pkt, target);
-
-    }
-
-    //Then 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->result != Packet::Nacked);
+    // 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 (pkt->needsResponse()) {
-        pkt->makeTimingResponse();
-        sendTimingLater(pkt, latency);
-    }
-    else {
-        if (pkt->cmd != Packet::UpgradeReq)
-        {
-            delete pkt->req;
-            delete pkt;
-        }
-    }
-    return true;
-}
-
-void
-SimpleTimingPort::recvRetry()
-{
-    assert(outTiming > 0);
-    assert(!transmitList.empty());
-    if (sendTiming(transmitList.front())) {
-        transmitList.pop_front();
-        outTiming--;
-        DPRINTF(Bus, "No Longer waiting on retry\n");
-        if (!transmitList.empty())
-            sendTimingLater(transmitList.front(), 1);
-    }
-
-    if (transmitList.empty() && drainEvent) {
-        drainEvent->process();
-        drainEvent = NULL;
-    }
-}
-
-void
-SimpleTimingPort::SendEvent::process()
-{
-    assert(port->outTiming > 0);
-    if (!port->transmitList.empty() && port->transmitList.front() != packet) {
-        //We are not the head of the list
-        port->transmitList.push_back(packet);
-    } else if (port->sendTiming(packet)) {
-        // send successful
-        if (port->transmitList.size()) {
-            port->transmitList.pop_front();
-            port->outTiming--;
-           if (!port->transmitList.empty())
-                port->sendTimingLater(port->transmitList.front(), 1);
-        }
-        if (port->transmitList.empty() && port->drainEvent) {
-            port->drainEvent->process();
-            port->drainEvent = NULL;
-        }
+    if (needsResponse) {
+        // recvAtomic() should already have turned packet into
+        // atomic response
+        assert(pkt->isResponse());
+        schedTimingResp(pkt, curTick() + latency);
     } else {
-        // send unsuccessful (due to flow control).  Will get retry
-        // callback later; save for then if not already
-        DPRINTF(Bus, "Waiting on retry\n");
-        if (!(port->transmitList.front() == packet))
-            port->transmitList.push_back(packet);
+        // queue the packet for deletion
+        pendingDelete.reset(pkt);
     }
-}
 
-
-unsigned int
-SimpleTimingPort::drain(Event *de)
-{
-    if (outTiming == 0 && transmitList.size() == 0)
-        return 0;
-    drainEvent = de;
-    return 1;
+    return true;
 }