X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmem%2Ftport.cc;h=4de495e22f6d376ea65b547437ebc95384d70a0a;hb=abd33d6fd26bb69d3bf53ceb6c2dc8f90d893e34;hp=b9d5cbe4ae243f300ee73cedd22a28517fbd36d3;hpb=2f30c2b4c982b61b393a2888c022fbeac3225d59;p=gem5.git

diff --git a/src/mem/tport.cc b/src/mem/tport.cc
index b9d5cbe4a..4de495e22 100644
--- 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.
  *
@@ -26,114 +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::recvFunctional(PacketPtr pkt)
+SimpleTimingPort::SimpleTimingPort(const std::string& _name,
+                                   SimObject* _owner) :
+    QueuedSlavePort(_name, _owner, queueImpl), queueImpl(*_owner, *this)
 {
-    std::list<std::pair<Tick,PacketPtr> >::iterator i = transmitList.begin();
-    std::list<std::pair<Tick,PacketPtr> >::iterator end = transmitList.end();
-    bool done = false;
-
-    while (i != end && !done) {
-        PacketPtr target = i->second;
-        // If the target contains data, and it overlaps the
-        // probed request, need to update data
-        if (target->intersect(pkt))
-            done = fixPacket(pkt, target);
-
-    }
-
-    //Then just do an atomic access and throw away the returned latency
-    if (pkt->result != Packet::Success)
-        recvAtomic(pkt);
-}
-
-bool
-SimpleTimingPort::recvTiming(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);
-    Tick latency = recvAtomic(pkt);
-    // turn packet around to go back to requester if response expected
-    if (pkt->needsResponse()) {
-        pkt->makeTimingResponse();
-        sendTiming(pkt, latency);
-    }
-    else {
-        if (pkt->cmd != Packet::UpgradeReq)
-        {
-            delete pkt->req;
-            delete pkt;
-        }
-    }
-    return true;
 }
 
 void
-SimpleTimingPort::recvRetry()
+SimpleTimingPort::recvFunctional(PacketPtr pkt)
 {
-    assert(!transmitList.empty());
-    if (Port::sendTiming(transmitList.front().second)) {
-        transmitList.pop_front();
-        DPRINTF(Bus, "No Longer waiting on retry\n");
-        if (!transmitList.empty()) {
-            Tick time = transmitList.front().first;
-            sendEvent.schedule(time <= curTick ? curTick+1 : time);
-        }
-    }
-
-    if (transmitList.empty() && drainEvent) {
-        drainEvent->process();
-        drainEvent = NULL;
+    if (!respQueue.trySatisfyFunctional(pkt)) {
+        // do an atomic access and throw away the returned latency
+        recvAtomic(pkt);
     }
 }
 
-void
-SimpleTimingPort::sendTiming(PacketPtr pkt, Tick time)
+bool
+SimpleTimingPort::recvTimingReq(PacketPtr pkt)
 {
-    if (transmitList.empty()) {
-        assert(!sendEvent.scheduled());
-        sendEvent.schedule(curTick+time);
-    }
-    transmitList.push_back(std::pair<Tick,PacketPtr>(time+curTick,pkt));
-}
+    // 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");
 
-void
-SimpleTimingPort::SendEvent::process()
-{
-    assert(port->transmitList.size());
-    assert(port->transmitList.front().first <= curTick);
-    if (port->Port::sendTiming(port->transmitList.front().second)) {
-        //send successful, remove packet
-        port->transmitList.pop_front();
-        if (!port->transmitList.empty()) {
-            Tick time = port->transmitList.front().first;
-            schedule(time <= curTick ? curTick+1 : time);
-        }
-        if (port->transmitList.empty() && port->drainEvent) {
-            port->drainEvent->process();
-            port->drainEvent = NULL;
-        }
-        return;
+    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
+        assert(pkt->isResponse());
+        schedTimingResp(pkt, curTick() + latency);
+    } else {
+        // queue the packet for deletion
+        pendingDelete.reset(pkt);
     }
-    // send unsuccessful (due to flow control).  Will get retry
-    // callback later; save for then if not already
-    DPRINTF(Bus, "Waiting on retry\n");
-}
-
 
-unsigned int
-SimpleTimingPort::drain(Event *de)
-{
-    if (transmitList.size() == 0)
-        return 0;
-    drainEvent = de;
-    return 1;
+    return true;
 }