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+
+/*
+ * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * $Id: BarrierGenerator.C 1.3 2005/01/19 13:12:35-06:00 mikem@maya.cs.wisc.edu $
+ *
+ */
+
+#include "BarrierGenerator.hh"
+#include "Sequencer.hh"
+#include "System.hh"
+#include "RubyConfig.hh"
+#include "SubBlock.hh"
+#include "SyntheticDriver.hh"
+#include "Chip.hh"
+
+BarrierGenerator::BarrierGenerator(NodeID node, SyntheticDriver& driver) :
+ m_driver(driver)
+{
+ m_status = BarrierGeneratorStatus_Thinking;
+ m_last_transition = 0;
+ m_node = node;
+ m_counter = 0;
+ proc_counter = 0;
+ m_local_sense = false;
+
+ m_total_think = 0;
+ m_think_periods = 0;
+
+ g_eventQueue_ptr->scheduleEvent(this, 1+(random() % 200));
+}
+
+BarrierGenerator::~BarrierGenerator()
+{
+}
+
+void BarrierGenerator::wakeup()
+{
+ DEBUG_EXPR(TESTER_COMP, MedPrio, m_node);
+ DEBUG_EXPR(TESTER_COMP, MedPrio, m_status);
+
+ if (m_status == BarrierGeneratorStatus_Thinking) {
+ m_barrier_done = false;
+ m_local_sense = !m_local_sense;
+ m_status = BarrierGeneratorStatus_Test_Pending;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ initiateTest(); // Test
+ } else if (m_status == BarrierGeneratorStatus_Test_Waiting) {
+ m_status = BarrierGeneratorStatus_Test_Pending;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ initiateTest(); // Test
+ } else if (m_status == BarrierGeneratorStatus_Release_Waiting) {
+ m_status = BarrierGeneratorStatus_Release_Pending;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ initiateRelease(); // Test
+ } else if (m_status == BarrierGeneratorStatus_StoreBarrierCounter_Waiting) {
+ m_status = BarrierGeneratorStatus_StoreBarrierCounter_Pending;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ initiateStoreCtr();
+ } else if (m_status == BarrierGeneratorStatus_StoreFlag_Waiting) {
+ m_status = BarrierGeneratorStatus_StoreFlag_Pending;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ initiateStoreFlag();
+ } else if (m_status == BarrierGeneratorStatus_Holding) {
+ m_status = BarrierGeneratorStatus_Release_Pending;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ initiateRelease(); // Release
+ } else if (m_status == BarrierGeneratorStatus_Before_Swap) {
+ m_status = BarrierGeneratorStatus_Swap_Pending;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ initiateSwap();
+ } else if (m_status == BarrierGeneratorStatus_SpinFlag_Ready) {
+ m_status = BarrierGeneratorStatus_SpinFlag_Pending;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ initiateLoadFlag();
+ } else {
+ WARN_EXPR(m_status);
+ ERROR_MSG("Invalid status");
+ }
+}
+
+void BarrierGenerator::performCallback(NodeID proc, SubBlock& data)
+{
+ Address address = data.getAddress();
+ assert(proc == m_node);
+
+ DEBUG_EXPR(TESTER_COMP, LowPrio, proc);
+ DEBUG_EXPR(TESTER_COMP, LowPrio, m_status);
+ DEBUG_EXPR(TESTER_COMP, LowPrio, address);
+ DEBUG_EXPR(TESTER_COMP, LowPrio, data);
+
+ if (m_status == BarrierGeneratorStatus_Test_Pending) {
+ uint8 dat = data.readByte();
+ uint8 lock = dat >> 7;
+ if (lock == 1) {
+ // Locked - keep spinning
+ m_status = BarrierGeneratorStatus_Test_Waiting;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ g_eventQueue_ptr->scheduleEvent(this, waitTime());
+ } else {
+ // Unlocked - try the swap
+ m_driver.recordTestLatency(g_eventQueue_ptr->getTime() - m_last_transition);
+ m_status = BarrierGeneratorStatus_Before_Swap;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ g_eventQueue_ptr->scheduleEvent(this, waitTime());
+ }
+ } else if (m_status == BarrierGeneratorStatus_Swap_Pending) {
+ m_driver.recordSwapLatency(g_eventQueue_ptr->getTime() - m_last_transition);
+ uint8 dat = data.readByte();
+ uint8 lock = dat >> 7;
+ if (lock == 1) {
+ // We failed to aquire the lock
+ m_status = BarrierGeneratorStatus_Test_Waiting;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ g_eventQueue_ptr->scheduleEvent(this, waitTime());
+ } else {
+ // We acquired the lock
+ dat = dat | 0x80;
+ data.writeByte(dat);
+ m_status = BarrierGeneratorStatus_StoreBarrierCounter_Waiting;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ DEBUG_MSG(TESTER_COMP, HighPrio, "Acquired");
+ DEBUG_EXPR(TESTER_COMP, HighPrio, proc);
+ DEBUG_EXPR(TESTER_COMP, HighPrio, g_eventQueue_ptr->getTime());
+ // g_eventQueue_ptr->scheduleEvent(this, holdTime());
+
+ g_eventQueue_ptr->scheduleEvent(this, 1);
+
+ // initiateLoadCtr();
+ }
+ } else if (m_status == BarrierGeneratorStatus_StoreBarrierCounter_Pending) {
+
+ // if value == p, reset counter and set local sense flag
+ uint8 ctr = data.readByte();
+ //uint8 sense = ctr >> 4;
+ ctr = ctr & 0x0F;
+
+ ctr++;
+ data.writeByte( ctr | 0x80); // store counter and lock
+
+ //cout << m_node << " incremented Barrier_ctr to " << (int)ctr << ", " << data << "\n";
+
+ if (ctr == (uint8) 16) {
+
+ data.writeByte( 0x0 );
+ m_status = BarrierGeneratorStatus_StoreFlag_Waiting;
+ m_barrier_done = true;
+
+ g_eventQueue_ptr->scheduleEvent(this, 1);
+ }
+ else {
+
+ m_status = BarrierGeneratorStatus_Release_Waiting;
+ g_eventQueue_ptr->scheduleEvent(this, 1);
+ }
+ } else if (m_status == BarrierGeneratorStatus_StoreFlag_Pending) {
+
+ // write flag
+ if (m_local_sense) {
+ data.writeByte( 0x01 );
+ }
+ else {
+ data.writeByte( 0x00 );
+ }
+
+ m_status = BarrierGeneratorStatus_Release_Waiting;
+ g_eventQueue_ptr->scheduleEvent(this, 1);
+
+ } else if (m_status == BarrierGeneratorStatus_Release_Pending) {
+ m_driver.recordReleaseLatency(g_eventQueue_ptr->getTime() - m_last_transition);
+ // We're releasing the lock
+ uint8 dat = data.readByte();
+ dat = dat & 0x7F;
+ data.writeByte(dat);
+
+ if (m_barrier_done) {
+ m_counter++;
+ proc_counter++;
+ if (m_counter < g_tester_length) {
+ m_status = BarrierGeneratorStatus_Thinking;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ g_eventQueue_ptr->scheduleEvent(this, thinkTime());
+ } else {
+
+ m_driver.reportDone(proc_counter, m_node);
+ m_last_transition = g_eventQueue_ptr->getTime();
+ }
+ }
+ else {
+ m_status = BarrierGeneratorStatus_SpinFlag_Ready;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ g_eventQueue_ptr->scheduleEvent(this, waitTime());
+ }
+ } else if (m_status == BarrierGeneratorStatus_SpinFlag_Pending) {
+
+ uint8 sense = data.readByte();
+
+
+ if (sense != m_local_sense) {
+ m_status = BarrierGeneratorStatus_SpinFlag_Ready;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ g_eventQueue_ptr->scheduleEvent(this, waitTime());
+ }
+ else {
+ m_counter++;
+ proc_counter++;
+ if (m_counter < g_tester_length) {
+ m_status = BarrierGeneratorStatus_Thinking;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ g_eventQueue_ptr->scheduleEvent(this, thinkTime());
+ } else {
+ m_driver.reportDone(proc_counter, m_node);
+ m_status = BarrierGeneratorStatus_Done;
+ m_last_transition = g_eventQueue_ptr->getTime();
+ }
+ }
+
+ } else {
+ WARN_EXPR(m_status);
+ ERROR_MSG("Invalid status");
+ }
+}
+
+int BarrierGenerator::thinkTime()
+{
+ int ret;
+ float ratio = g_think_fudge_factor;
+
+ // return 400;
+
+ if (ratio == 0) {
+ return g_think_time;
+ }
+
+ int r = random();
+ int x = (int) ( (float)g_think_time*ratio*2.0);
+ int mod = r % x;
+
+
+ int rand = ( mod+1 - ((float)g_think_time*ratio) );
+
+ ret = (g_think_time + rand);
+
+ m_total_think += ret;
+ m_think_periods++;
+
+ return ret;
+}
+
+int BarrierGenerator::waitTime() const
+{
+ return g_wait_time;
+}
+
+
+void BarrierGenerator::initiateTest()
+{
+ DEBUG_MSG(TESTER_COMP, MedPrio, "initiating Test");
+ sequencer()->makeRequest(CacheMsg(Address(0x40), CacheRequestType_LD, Address(1), AccessModeType_UserMode, 1, PrefetchBit_No, 0, false));
+}
+
+void BarrierGenerator::initiateSwap()
+{
+ DEBUG_MSG(TESTER_COMP, MedPrio, "initiating Swap");
+ sequencer()->makeRequest(CacheMsg(Address(0x40), CacheRequestType_ATOMIC, Address(2), AccessModeType_UserMode, 1, PrefetchBit_No, 0, false));
+}
+
+void BarrierGenerator::initiateRelease()
+{
+ DEBUG_MSG(TESTER_COMP, MedPrio, "initiating Release");
+ sequencer()->makeRequest(CacheMsg(Address(0x40), CacheRequestType_ST, Address(3), AccessModeType_UserMode, 1, PrefetchBit_No, 0, false));
+}
+
+void BarrierGenerator::initiateLoadCtr()
+{
+ DEBUG_MSG(TESTER_COMP, MedPrio, "initiating load of barrier counter");
+ sequencer()->makeRequest(CacheMsg(Address(0x40), CacheRequestType_LD, Address(3), AccessModeType_UserMode, 1, PrefetchBit_No, 0, false));
+}
+
+void BarrierGenerator::initiateStoreCtr()
+{
+ DEBUG_MSG(TESTER_COMP, MedPrio, "initiating load of barrier counter");
+ sequencer()->makeRequest(CacheMsg(Address(0x40), CacheRequestType_ST, Address(3), AccessModeType_UserMode, 1, PrefetchBit_No, 0, false));
+}
+
+void BarrierGenerator::initiateStoreFlag()
+{
+ DEBUG_MSG(TESTER_COMP, MedPrio, "initiating load of barrier counter");
+ sequencer()->makeRequest(CacheMsg(Address(0x00), CacheRequestType_ST, Address(3), AccessModeType_UserMode, 1, PrefetchBit_No, 0, false));
+}
+
+void BarrierGenerator::initiateLoadFlag()
+{
+ DEBUG_MSG(TESTER_COMP, MedPrio, "initiating load of barrier counter");
+ sequencer()->makeRequest(CacheMsg(Address(0x00), CacheRequestType_LD, Address(3), AccessModeType_UserMode, 1, PrefetchBit_No, 0, false));
+}
+
+
+Sequencer* BarrierGenerator::sequencer() const
+{
+ return g_system_ptr->getChip(m_node/RubyConfig::numberOfProcsPerChip())->getSequencer(m_node%RubyConfig::numberOfProcsPerChip());
+}
+
+void BarrierGenerator::print(ostream& out) const
+{
+}
+
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