From b81a977e6ab7dbfd122cb778cfe3d40ca7451198 Mon Sep 17 00:00:00 2001
From: Andreas Sandberg <Andreas.Sandberg@arm.com>
Date: Fri, 2 Nov 2012 11:32:01 -0500
Subject: sim: Move the draining interface into a separate base class

This patch moves the draining interface from SimObject to a separate
class that can be used by any object needing draining. However,
objects not visible to the Python code (i.e., objects not deriving
from SimObject) still depend on their parents informing them when to
drain. This patch also gets rid of the CountedDrainEvent (which isn't
really an event) and replaces it with a DrainManager.
---
 src/dev/i8254xGBe.cc | 44 ++++++++++++++++++++++----------------------
 1 file changed, 22 insertions(+), 22 deletions(-)

(limited to 'src/dev/i8254xGBe.cc')

diff --git a/src/dev/i8254xGBe.cc b/src/dev/i8254xGBe.cc
index 159cc4726..9a3ddaeb7 100644
--- a/src/dev/i8254xGBe.cc
+++ b/src/dev/i8254xGBe.cc
@@ -57,7 +57,7 @@ using namespace iGbReg;
 using namespace Net;
 
 IGbE::IGbE(const Params *p)
-    : EtherDevice(p), etherInt(NULL),  drainEvent(NULL),
+    : EtherDevice(p), etherInt(NULL),  drainManager(NULL),
       useFlowControl(p->use_flow_control),
       rxFifo(p->rx_fifo_size), txFifo(p->tx_fifo_size), rxTick(false),
       txTick(false), txFifoTick(false), rxDmaPacket(false), pktOffset(0),
@@ -588,7 +588,7 @@ IGbE::write(PacketPtr pkt)
       case REG_RDT:
         regs.rdt = val;
         DPRINTF(EthernetSM, "RXS: RDT Updated.\n");
-        if (getState() == SimObject::Running) {
+        if (getDrainState() == Drainable::Running) {
             DPRINTF(EthernetSM, "RXS: RDT Fetching Descriptors!\n");
             rxDescCache.fetchDescriptors();
         } else {
@@ -628,7 +628,7 @@ IGbE::write(PacketPtr pkt)
       case REG_TDT:
         regs.tdt = val;
         DPRINTF(EthernetSM, "TXS: TX Tail pointer updated\n");
-        if (getState() == SimObject::Running) {
+        if (getDrainState() == Drainable::Running) {
             DPRINTF(EthernetSM, "TXS: TDT Fetching Descriptors!\n");
             txDescCache.fetchDescriptors();
         } else {
@@ -906,7 +906,7 @@ void
 IGbE::DescCache<T>::writeback1()
 {
     // If we're draining delay issuing this DMA
-    if (igbe->getState() != SimObject::Running) {
+    if (igbe->getDrainState() != Drainable::Running) {
         igbe->schedule(wbDelayEvent, curTick() + igbe->wbDelay);
         return;
     }
@@ -987,7 +987,7 @@ void
 IGbE::DescCache<T>::fetchDescriptors1()
 {
     // If we're draining delay issuing this DMA
-    if (igbe->getState() != SimObject::Running) {
+    if (igbe->getDrainState() != Drainable::Running) {
         igbe->schedule(fetchDelayEvent, curTick() + igbe->fetchDelay);
         return;
     }
@@ -1493,7 +1493,7 @@ IGbE::RxDescCache::pktComplete()
 void
 IGbE::RxDescCache::enableSm()
 {
-    if (!igbe->drainEvent) {
+    if (!igbe->drainManager) {
         igbe->rxTick = true;
         igbe->restartClock();
     }
@@ -2029,7 +2029,7 @@ IGbE::TxDescCache::packetAvailable()
 void
 IGbE::TxDescCache::enableSm()
 {
-    if (!igbe->drainEvent) {
+    if (!igbe->drainManager) {
         igbe->txTick = true;
         igbe->restartClock();
     }
@@ -2049,19 +2049,19 @@ void
 IGbE::restartClock()
 {
     if (!tickEvent.scheduled() && (rxTick || txTick || txFifoTick) &&
-        getState() == SimObject::Running)
+        getDrainState() == Drainable::Running)
         schedule(tickEvent, clockEdge(Cycles(1)));
 }
 
 unsigned int
-IGbE::drain(Event *de)
+IGbE::drain(DrainManager *dm)
 {
     unsigned int count;
-    count = pioPort.drain(de) + dmaPort.drain(de);
+    count = pioPort.drain(dm) + dmaPort.drain(dm);
     if (rxDescCache.hasOutstandingEvents() ||
         txDescCache.hasOutstandingEvents()) {
         count++;
-        drainEvent = de;
+        drainManager = dm;
     }
 
     txFifoTick = false;
@@ -2073,17 +2073,17 @@ IGbE::drain(Event *de)
 
     if (count) {
         DPRINTF(Drain, "IGbE not drained\n");
-        changeState(Draining);
+        setDrainState(Drainable::Draining);
     } else
-        changeState(Drained);
+        setDrainState(Drainable::Drained);
 
     return count;
 }
 
 void
-IGbE::resume()
+IGbE::drainResume()
 {
-    SimObject::resume();
+    Drainable::drainResume();
 
     txFifoTick = true;
     txTick = true;
@@ -2096,7 +2096,7 @@ IGbE::resume()
 void
 IGbE::checkDrain()
 {
-    if (!drainEvent)
+    if (!drainManager)
         return;
 
     txFifoTick = false;
@@ -2105,8 +2105,8 @@ IGbE::checkDrain()
     if (!rxDescCache.hasOutstandingEvents() &&
         !txDescCache.hasOutstandingEvents()) {
         DPRINTF(Drain, "IGbE done draining, processing drain event\n");
-        drainEvent->process();
-        drainEvent = NULL;
+        drainManager->signalDrainDone();
+        drainManager = NULL;
     }
 }
 
@@ -2130,7 +2130,7 @@ IGbE::txStateMachine()
         bool success =
 #endif
             txFifo.push(txPacket);
-        txFifoTick = true && !drainEvent;
+        txFifoTick = true && !drainManager;
         assert(success);
         txPacket = NULL;
         anBegin("TXS", "Desc Writeback");
@@ -2229,7 +2229,7 @@ IGbE::ethRxPkt(EthPacketPtr pkt)
     }
 
     // restart the state machines if they are stopped
-    rxTick = true && !drainEvent;
+    rxTick = true && !drainManager;
     if ((rxTick || txTick) && !tickEvent.scheduled()) {
         DPRINTF(EthernetSM,
                 "RXS: received packet into fifo, starting ticking\n");
@@ -2442,8 +2442,8 @@ IGbE::ethTxDone()
     // restart the tx state machines if they are stopped
     // fifo to send another packet
     // tx sm to put more data into the fifo
-    txFifoTick = true && !drainEvent;
-    if (txDescCache.descLeft() != 0 && !drainEvent)
+    txFifoTick = true && !drainManager;
+    if (txDescCache.descLeft() != 0 && !drainManager)
         txTick = true;
 
     restartClock();
-- 
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