Add a very poor implementation of dealing with retries on timing requests. It is especially slow with tracing on since

it ends up being O(N^2). But it's probably going to have to change for the real bus anyway, so it should be rewritten then
Change recvRetry() to not accept a packet. Sendtiming should be called again (and can respond with false or true)
Removed Port Blocked/Unblocked and replaced with sendRetry().
Remove possibility of packet mangling if packet is going to be refused anyway in bridge

src/cpu/simple/atomic.cc:
src/cpu/simple/atomic.hh:
src/cpu/simple/timing.cc:
src/cpu/simple/timing.hh:
    Change recvRetry() to not accept a packet. Sendtiming should be called again (and can respond with false or true)
src/dev/io_device.cc:
src/dev/io_device.hh:
    Make DMA Timing requests/responses work.
    Change recvRetry() to not accept a packet. Sendtiming should be called again (and can respond with false or true)
src/mem/bridge.cc:
src/mem/bridge.hh:
    Change recvRetry() to not accept a packet. Sendtiming should be called again (and can respond with false or true)
    Removed Port Blocked/Unblocked and replaced with sendRetry().
    Remove posibility of packet mangling if packet is going to be refused anyway.
src/mem/bus.cc:
src/mem/bus.hh:
    Add a very poor implementation of dealing with retries on timing requests. It is especially slow with tracing on since
    it ends up being O(N^2). But it's probably going to have to change for the real bus anyway, so it should be rewritten then
src/mem/port.hh:
    Change recvRetry() to not accept a packet. Sendtiming should be called again (and can respond with false or true)
    Removed Blocked/Unblocked port status, their functionality is really duplicated in the recvRetry() method

--HG--
extra : convert_revision : fab613404be54bfa7a4c67572bae7b559169e573

src/dev/io_device.cc

@@ -26,6 +26,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include "base/trace.hh"
 #include "dev/io_device.hh"
 #include "sim/builder.hh"
 
@@ -55,12 +56,13 @@ PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
 }
 
 
-Packet *
+void
 PioPort::recvRetry()
 {
     Packet* pkt = transmitList.front();
-    transmitList.pop_front();
-    return pkt;
+    if (Port::sendTiming(pkt)) {
+        transmitList.pop_front();
+    }
 }
 
 
@@ -74,6 +76,7 @@ PioPort::SendEvent::process()
 }
 
 
+
 bool
 PioPort::recvTiming(Packet *pkt)
 {
@@ -116,16 +119,20 @@ DmaPort::recvTiming(Packet *pkt)
 {
     if (pkt->senderState) {
         DmaReqState *state;
+        DPRINTF(DMA, "Received response Packet %#x with senderState: %#x\n",
+               pkt, pkt->senderState);
         state = dynamic_cast<DmaReqState*>(pkt->senderState);
-        state->completionEvent->schedule(pkt->time - pkt->req->getTime());
+        assert(state);
+        state->completionEvent->process();
         delete pkt->req;
         delete pkt;
     }  else {
+        DPRINTF(DMA, "Received response Packet %#x with no senderState\n", pkt);
         delete pkt->req;
         delete pkt;
     }
 
-    return Packet::Success;
+    return true;
 }
 
 DmaDevice::DmaDevice(Params *p)
@@ -133,20 +140,19 @@ DmaDevice::DmaDevice(Params *p)
 { }
 
 void
-DmaPort::SendEvent::process()
-{
-    if (port->Port::sendTiming(packet))
-        return;
-
-    port->transmitList.push_back(packet);
-}
-
-Packet *
 DmaPort::recvRetry()
 {
     Packet* pkt = transmitList.front();
-    transmitList.pop_front();
-    return pkt;
+    DPRINTF(DMA, "Retry on  Packet %#x with senderState: %#x\n",
+               pkt, pkt->senderState);
+    if (sendTiming(pkt)) {
+        DPRINTF(DMA, "-- Done\n");
+        transmitList.pop_front();
+        pendingCount--;
+        assert(pendingCount >= 0);
+    } else {
+        DPRINTF(DMA, "-- Failed, queued\n");
+    }
 }
 
 
@@ -192,13 +198,22 @@ DmaPort::sendDma(Packet *pkt)
    // switching actually work
   /* MemState state = device->platform->system->memState;
 
-   if (state == Timing) {
-       if (!sendTiming(pkt))
-           transmitList.push_back(&packet);
-    } else if (state == Atomic) {*/
+   if (state == Timing) {  */
+       DPRINTF(DMA, "Attempting to send Packet %#x with senderState: %#x\n",
+               pkt, pkt->senderState);
+       if (!sendTiming(pkt)) {
+           transmitList.push_back(pkt);
+           DPRINTF(DMA, "-- Failed: queued\n");
+       } else {
+           DPRINTF(DMA, "-- Done\n");
+           pendingCount--;
+           assert(pendingCount >= 0);
+       }
+  /*  } else if (state == Atomic) {
        sendAtomic(pkt);
        if (pkt->senderState) {
            DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
+           assert(state);
            state->completionEvent->schedule(curTick + (pkt->time - pkt->req->getTime()) +1);
        }
        pendingCount--;
@@ -206,7 +221,7 @@ DmaPort::sendDma(Packet *pkt)
        delete pkt->req;
        delete pkt;
 
-/*   } else if (state == Functional) {
+   } else if (state == Functional) {
        sendFunctional(pkt);
        // Is this correct???
        completionEvent->schedule(pkt->req->responseTime - pkt->req->requestTime);

src/dev/io_device.hh

@@ -105,8 +105,9 @@ class PioPort : public Port
     void sendTiming(Packet *pkt, Tick time)
     { new PioPort::SendEvent(this, pkt, time); }
 
-    /** This function pops the last element off the transmit list and sends it.*/
-    virtual Packet *recvRetry();
+    /** This function is notification that the device should attempt to send a
+     * packet again. */
+    virtual void recvRetry();
 
   public:
     PioPort(PioDevice *dev, Platform *p);
@@ -146,28 +147,11 @@ class DmaPort : public Port
     virtual void recvStatusChange(Status status)
     { ; }
 
-    virtual Packet *recvRetry() ;
+    virtual void recvRetry() ;
 
     virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
     { resp.clear(); snoop.clear(); }
 
-    class SendEvent : public Event
-    {
-        DmaPort *port;
-        Packet *packet;
-
-        SendEvent(PioPort *p, Packet *pkt, Tick t)
-            : Event(&mainEventQueue), packet(pkt)
-        { schedule(curTick + t); }
-
-        virtual void process();
-
-        virtual const char *description()
-        { return "Future scheduled sendTiming event"; }
-
-        friend class DmaPort;
-    };
-
     void sendDma(Packet *pkt);
 
   public:
@@ -178,8 +162,6 @@ class DmaPort : public Port
 
     bool dmaPending() { return pendingCount > 0; }
 
-  friend class DmaPort::SendEvent;
-
 };
 
 /**