sanchayanmaity/gem5
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
gem5/src/mem/protocol/MOESI_CMP_directory-L1cache.sm

1154 lines
36 KiB
Text
Raw Normal View History

ruby: Import ruby and slicc from GEMS We eventually plan to replace the m5 cache hierarchy with the GEMS hierarchy, but for now we will make both live alongside eachother.
2009-05-11 19:38:43 +02:00
/*
* Copyright (c) 1999-2005 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.
*/
/*
* $Id$
*
*/
machine(L1Cache, "Directory protocol") {
// NODE L1 CACHE
// From this node's L1 cache TO the network
// a local L1 -> this L2 bank, currently ordered with directory forwarded requests
MessageBuffer requestFromL1Cache, network="To", virtual_network="0", ordered="false";
MessageBuffer foo, network="To", virtual_network="1", ordered="false";
// a local L1 -> this L2 bank
MessageBuffer responseFromL1Cache, network="To", virtual_network="2", ordered="false";
// MessageBuffer writebackFromL1Cache, network="To", virtual_network="3", ordered="false";
// To this node's L1 cache FROM the network
// a L2 bank -> this L1
MessageBuffer requestToL1Cache, network="From", virtual_network="0", ordered="false";
MessageBuffer goo, network="From", virtual_network="1", ordered="false";
// a L2 bank -> this L1
MessageBuffer responseToL1Cache, network="From", virtual_network="2", ordered="false";
// STATES
enumeration(State, desc="Cache states", default="L1Cache_State_I") {
// Base states
I, desc="Idle";
S, desc="Shared";
O, desc="Owned";
M, desc="Modified (dirty)";
M_W, desc="Modified (dirty)";
MM, desc="Modified (dirty and locally modified)";
MM_W, desc="Modified (dirty and locally modified)";
// Transient States
IM, "IM", desc="Issued GetX";
SM, "SM", desc="Issued GetX, we still have an old copy of the line";
OM, "SM", desc="Issued GetX, received data";
IS, "IS", desc="Issued GetS";
SI, "OI", desc="Issued PutS, waiting for ack";
OI, "OI", desc="Issued PutO, waiting for ack";
MI, "MI", desc="Issued PutX, waiting for ack";
II, "II", desc="Issued PutX/O, saw Fwd_GETS or Fwd_GETX, waiting for ack";
}
// EVENTS
enumeration(Event, desc="Cache events") {
Load, desc="Load request from the processor";
Ifetch, desc="I-fetch request from the processor";
Store, desc="Store request from the processor";
L1_Replacement, desc="Replacement";
// Requests
Own_GETX, desc="We observe our own GetX forwarded back to us";
Fwd_GETX, desc="A GetX from another processor";
Fwd_GETS, desc="A GetS from another processor";
Inv, desc="Invalidations from the directory";
// Responses
Ack, desc="Received an ack message";
Data, desc="Received a data message, responder has a shared copy";
Exclusive_Data, desc="Received a data message";
Writeback_Ack, desc="Writeback O.K. from directory";
Writeback_Ack_Data, desc="Writeback O.K. from directory";
Writeback_Nack, desc="Writeback not O.K. from directory";
// Triggers
All_acks, desc="Received all required data and message acks";
// Timeouts
Use_Timeout, desc="lockout period ended";
}
// TYPES
// CacheEntry
structure(Entry, desc="...", interface="AbstractCacheEntry") {
State CacheState, desc="cache state";
bool Dirty, desc="Is the data dirty (different than memory)?";
DataBlock DataBlk, desc="data for the block";
}
// TBE fields
structure(TBE, desc="...") {
Address Address, desc="Physical address for this TBE";
State TBEState, desc="Transient state";
DataBlock DataBlk, desc="data for the block, required for concurrent writebacks";
bool Dirty, desc="Is the data dirty (different than memory)?";
int NumPendingMsgs, default="0", desc="Number of acks/data messages that this processor is waiting for";
}
external_type(CacheMemory) {
bool cacheAvail(Address);
Address cacheProbe(Address);
void allocate(Address);
void deallocate(Address);
Entry lookup(Address);
void changePermission(Address, AccessPermission);
bool isTagPresent(Address);
}
external_type(TBETable) {
TBE lookup(Address);
void allocate(Address);
void deallocate(Address);
bool isPresent(Address);
}
MessageBuffer mandatoryQueue, ordered="false", abstract_chip_ptr="true";
Sequencer sequencer, abstract_chip_ptr="true", constructor_hack="i";
TBETable TBEs, template_hack="<L1Cache_TBE>";
CacheMemory L1IcacheMemory, template_hack="<L1Cache_Entry>", constructor_hack='L1_CACHE_NUM_SETS_BITS,L1_CACHE_ASSOC,MachineType_L1Cache,int_to_string(i)+"_L1I"', abstract_chip_ptr="true";
CacheMemory L1DcacheMemory, template_hack="<L1Cache_Entry>", constructor_hack='L1_CACHE_NUM_SETS_BITS,L1_CACHE_ASSOC,MachineType_L1Cache,int_to_string(i)+"_L1D"', abstract_chip_ptr="true";
TimerTable useTimerTable;
Entry getCacheEntry(Address addr), return_by_ref="yes" {
if (L1DcacheMemory.isTagPresent(addr)) {
return L1DcacheMemory[addr];
} else {
return L1IcacheMemory[addr];
}
}
void changePermission(Address addr, AccessPermission permission) {
if (L1DcacheMemory.isTagPresent(addr)) {
return L1DcacheMemory.changePermission(addr, permission);
} else {
return L1IcacheMemory.changePermission(addr, permission);
}
}
bool isCacheTagPresent(Address addr) {
return (L1DcacheMemory.isTagPresent(addr) || L1IcacheMemory.isTagPresent(addr));
}
State getState(Address addr) {
assert((L1DcacheMemory.isTagPresent(addr) && L1IcacheMemory.isTagPresent(addr)) == false);
if(TBEs.isPresent(addr)) {
return TBEs[addr].TBEState;
} else if (isCacheTagPresent(addr)) {
return getCacheEntry(addr).CacheState;
}
return State:I;
}
void setState(Address addr, State state) {
assert((L1DcacheMemory.isTagPresent(addr) && L1IcacheMemory.isTagPresent(addr)) == false);
if (TBEs.isPresent(addr)) {
TBEs[addr].TBEState := state;
}
if (isCacheTagPresent(addr)) {
if ( ((getCacheEntry(addr).CacheState != State:M) && (state == State:M)) ||
((getCacheEntry(addr).CacheState != State:MM) && (state == State:MM)) ||
((getCacheEntry(addr).CacheState != State:S) && (state == State:S)) ||
((getCacheEntry(addr).CacheState != State:O) && (state == State:O)) ) {
getCacheEntry(addr).CacheState := state;
sequencer.checkCoherence(addr);
}
else {
getCacheEntry(addr).CacheState := state;
}
// Set permission
if (state == State:MM || state == State:MM_W) {
changePermission(addr, AccessPermission:Read_Write);
} else if ((state == State:S) ||
(state == State:O) ||
(state == State:M) ||
(state == State:M_W) ||
(state == State:SM) ||
(state == State:OM)) {
changePermission(addr, AccessPermission:Read_Only);
} else {
changePermission(addr, AccessPermission:Invalid);
}
}
}
bool isBlockExclusive(Address addr) {
if (isCacheTagPresent(addr)) {
if ( (getCacheEntry(addr).CacheState == State:M) || (getCacheEntry(addr).CacheState == State:MM)
|| (getCacheEntry(addr).CacheState == State:MI) || (getCacheEntry(addr).CacheState == State:MM_W)
) {
return true;
}
}
return false;
}
bool isBlockShared(Address addr) {
if (isCacheTagPresent(addr)) {
if ( (getCacheEntry(addr).CacheState == State:S) || (getCacheEntry(addr).CacheState == State:O)
|| (getCacheEntry(addr).CacheState == State:SM)
|| (getCacheEntry(addr).CacheState == State:OI)
|| (getCacheEntry(addr).CacheState == State:SI)
|| (getCacheEntry(addr).CacheState == State:OM)
) {
return true;
}
}
return false;
}
Event mandatory_request_type_to_event(CacheRequestType type) {
if (type == CacheRequestType:LD) {
return Event:Load;
} else if (type == CacheRequestType:IFETCH) {
return Event:Ifetch;
} else if ((type == CacheRequestType:ST) || (type == CacheRequestType:ATOMIC)) {
return Event:Store;
} else {
error("Invalid CacheRequestType");
}
}
MessageBuffer triggerQueue, ordered="true";
// ** OUT_PORTS **
out_port(requestNetwork_out, RequestMsg, requestFromL1Cache);
out_port(responseNetwork_out, ResponseMsg, responseFromL1Cache);
out_port(triggerQueue_out, TriggerMsg, triggerQueue);
out_port(foo_out, ResponseMsg, foo);
// ** IN_PORTS **
// Use Timer
in_port(useTimerTable_in, Address, useTimerTable) {
if (useTimerTable_in.isReady()) {
trigger(Event:Use_Timeout, useTimerTable.readyAddress());
}
}
in_port(goo_in, RequestMsg, goo) {
if (goo_in.isReady()) {
peek(goo_in, RequestMsg) {
assert(false);
}
}
}
// Trigger Queue
in_port(triggerQueue_in, TriggerMsg, triggerQueue) {
if (triggerQueue_in.isReady()) {
peek(triggerQueue_in, TriggerMsg) {
if (in_msg.Type == TriggerType:ALL_ACKS) {
trigger(Event:All_acks, in_msg.Address);
} else {
error("Unexpected message");
}
}
}
}
// Nothing from the request network
// Request Network
in_port(requestNetwork_in, RequestMsg, requestToL1Cache) {
if (requestNetwork_in.isReady()) {
peek(requestNetwork_in, RequestMsg) {
assert(in_msg.Destination.isElement(machineID));
DEBUG_EXPR("MRM_DEBUG: L1 received");
DEBUG_EXPR(in_msg.Type);
if (in_msg.Type == CoherenceRequestType:GETX) {
if (in_msg.Requestor == machineID && in_msg.RequestorMachine == MachineType:L1Cache) {
trigger(Event:Own_GETX, in_msg.Address);
} else {
trigger(Event:Fwd_GETX, in_msg.Address);
}
} else if (in_msg.Type == CoherenceRequestType:GETS) {
trigger(Event:Fwd_GETS, in_msg.Address);
} else if (in_msg.Type == CoherenceRequestType:WB_ACK) {
trigger(Event:Writeback_Ack, in_msg.Address);
} else if (in_msg.Type == CoherenceRequestType:WB_ACK_DATA) {
trigger(Event:Writeback_Ack_Data, in_msg.Address);
} else if (in_msg.Type == CoherenceRequestType:WB_NACK) {
trigger(Event:Writeback_Nack, in_msg.Address);
} else if (in_msg.Type == CoherenceRequestType:INV) {
trigger(Event:Inv, in_msg.Address);
} else {
error("Unexpected message");
}
}
}
}
// Response Network
in_port(responseToL1Cache_in, ResponseMsg, responseToL1Cache) {
if (responseToL1Cache_in.isReady()) {
peek(responseToL1Cache_in, ResponseMsg) {
if (in_msg.Type == CoherenceResponseType:ACK) {
trigger(Event:Ack, in_msg.Address);
} else if (in_msg.Type == CoherenceResponseType:DATA) {
trigger(Event:Data, in_msg.Address);
} else if (in_msg.Type == CoherenceResponseType:DATA_EXCLUSIVE) {
trigger(Event:Exclusive_Data, in_msg.Address);
} else {
error("Unexpected message");
}
}
}
}
// Nothing from the unblock network
// Mandatory Queue betweens Node's CPU and it's L1 caches
in_port(mandatoryQueue_in, CacheMsg, mandatoryQueue, desc="...") {
if (mandatoryQueue_in.isReady()) {
peek(mandatoryQueue_in, CacheMsg) {
// Check for data access to blocks in I-cache and ifetchs to blocks in D-cache
if (in_msg.Type == CacheRequestType:IFETCH) {
// ** INSTRUCTION ACCESS ***
// Check to see if it is in the OTHER L1
if (L1DcacheMemory.isTagPresent(in_msg.Address)) {
// The block is in the wrong L1, put the request on the queue to the shared L2
trigger(Event:L1_Replacement, in_msg.Address);
}
if (L1IcacheMemory.isTagPresent(in_msg.Address)) {
// The tag matches for the L1, so the L1 asks the L2 for it.
trigger(mandatory_request_type_to_event(in_msg.Type), in_msg.Address);
} else {
if (L1IcacheMemory.cacheAvail(in_msg.Address)) {
// L1 does't have the line, but we have space for it in the L1 so let's see if the L2 has it
trigger(mandatory_request_type_to_event(in_msg.Type), in_msg.Address);
} else {
// No room in the L1, so we need to make room in the L1
trigger(Event:L1_Replacement, L1IcacheMemory.cacheProbe(in_msg.Address));
}
}
} else {
// *** DATA ACCESS ***
// Check to see if it is in the OTHER L1
if (L1IcacheMemory.isTagPresent(in_msg.Address)) {
// The block is in the wrong L1, put the request on the queue to the shared L2
trigger(Event:L1_Replacement, in_msg.Address);
}
if (L1DcacheMemory.isTagPresent(in_msg.Address)) {
// The tag matches for the L1, so the L1 ask the L2 for it
trigger(mandatory_request_type_to_event(in_msg.Type), in_msg.Address);
} else {
if (L1DcacheMemory.cacheAvail(in_msg.Address)) {
// L1 does't have the line, but we have space for it in the L1 let's see if the L2 has it
trigger(mandatory_request_type_to_event(in_msg.Type), in_msg.Address);
} else {
// No room in the L1, so we need to make room in the L1
trigger(Event:L1_Replacement, L1DcacheMemory.cacheProbe(in_msg.Address));
}
}
}
}
}
}
// ACTIONS
action(a_issueGETS, "a", desc="Issue GETS") {
peek(mandatoryQueue_in, CacheMsg) {
enqueue(requestNetwork_out, RequestMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceRequestType:GETS;
out_msg.Requestor := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address, machineID));
out_msg.MessageSize := MessageSizeType:Request_Control;
out_msg.AccessMode := in_msg.AccessMode;
out_msg.Prefetch := in_msg.Prefetch;
}
}
}
action(b_issueGETX, "b", desc="Issue GETX") {
peek(mandatoryQueue_in, CacheMsg) {
enqueue(requestNetwork_out, RequestMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceRequestType:GETX;
out_msg.Requestor := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address, machineID));
out_msg.MessageSize := MessageSizeType:Request_Control;
out_msg.AccessMode := in_msg.AccessMode;
out_msg.Prefetch := in_msg.Prefetch;
}
}
}
action(d_issuePUTX, "d", desc="Issue PUTX") {
// enqueue(writebackNetwork_out, RequestMsg, latency="L1_REQUEST_LATENCY") {
enqueue(requestNetwork_out, RequestMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceRequestType:PUTX;
out_msg.Requestor := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address, machineID));
out_msg.MessageSize := MessageSizeType:Writeback_Control;
}
}
action(dd_issuePUTO, "\d", desc="Issue PUTO") {
// enqueue(writebackNetwork_out, RequestMsg, latency="L1_REQUEST_LATENCY") {
enqueue(requestNetwork_out, RequestMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceRequestType:PUTO;
out_msg.Requestor := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address, machineID));
out_msg.MessageSize := MessageSizeType:Writeback_Control;
}
}
action(dd_issuePUTS, "\ds", desc="Issue PUTS") {
// enqueue(writebackNetwork_out, RequestMsg, latency="L1_REQUEST_LATENCY") {
enqueue(requestNetwork_out, RequestMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceRequestType:PUTS;
out_msg.Requestor := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address, machineID));
out_msg.MessageSize := MessageSizeType:Writeback_Control;
}
}
action(e_sendData, "e", desc="Send data from cache to requestor") {
peek(requestNetwork_in, RequestMsg) {
if (in_msg.RequestorMachine == MachineType:L2Cache) {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:DATA;
out_msg.Sender := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(in_msg.Address, machineID));
out_msg.DataBlk := getCacheEntry(address).DataBlk;
// out_msg.Dirty := getCacheEntry(address).Dirty;
out_msg.Dirty := false;
out_msg.Acks := in_msg.Acks;
out_msg.MessageSize := MessageSizeType:Response_Data;
}
DEBUG_EXPR("Sending data to L2");
DEBUG_EXPR(in_msg.Address);
}
else {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:DATA;
out_msg.Sender := machineID;
out_msg.Destination.add(in_msg.Requestor);
out_msg.DataBlk := getCacheEntry(address).DataBlk;
// out_msg.Dirty := getCacheEntry(address).Dirty;
out_msg.Dirty := false;
out_msg.Acks := in_msg.Acks;
out_msg.MessageSize := MessageSizeType:ResponseLocal_Data;
}
DEBUG_EXPR("Sending data to L1");
}
}
}
action(e_sendDataToL2, "ee", desc="Send data from cache to requestor") {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:DATA;
out_msg.Sender := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address, machineID));
out_msg.DataBlk := getCacheEntry(address).DataBlk;
out_msg.Dirty := getCacheEntry(address).Dirty;
out_msg.Acks := 0; // irrelevant
out_msg.MessageSize := MessageSizeType:Response_Data;
}
}
action(ee_sendDataExclusive, "\e", desc="Send data from cache to requestor, don't keep a shared copy") {
peek(requestNetwork_in, RequestMsg) {
if (in_msg.RequestorMachine == MachineType:L2Cache) {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:DATA_EXCLUSIVE;
out_msg.Sender := machineID;
out_msg.SenderMachine := MachineType:L1Cache;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(in_msg.Address, machineID));
out_msg.DataBlk := getCacheEntry(address).DataBlk;
out_msg.Dirty := getCacheEntry(address).Dirty;
out_msg.Acks := in_msg.Acks;
out_msg.MessageSize := MessageSizeType:Response_Data;
}
DEBUG_EXPR("Sending exclusive data to L2");
}
else {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:DATA_EXCLUSIVE;
out_msg.Sender := machineID;
out_msg.SenderMachine := MachineType:L1Cache;
out_msg.Destination.add(in_msg.Requestor);
out_msg.DataBlk := getCacheEntry(address).DataBlk;
out_msg.Dirty := getCacheEntry(address).Dirty;
out_msg.Acks := in_msg.Acks;
out_msg.MessageSize := MessageSizeType:ResponseLocal_Data;
}
DEBUG_EXPR("Sending exclusive data to L1");
}
}
}
action(f_sendAck, "f", desc="Send ack from cache to requestor") {
peek(requestNetwork_in, RequestMsg) {
if (in_msg.RequestorMachine == MachineType:L1Cache) {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:ACK;
out_msg.Sender := machineID;
out_msg.SenderMachine := MachineType:L1Cache;
out_msg.Destination.add(in_msg.Requestor);
out_msg.Acks := 0 - 1; // -1
out_msg.MessageSize := MessageSizeType:Response_Control;
}
}
else {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:ACK;
out_msg.Sender := machineID;
out_msg.SenderMachine := MachineType:L1Cache;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(in_msg.Address, machineID));
out_msg.Acks := 0 - 1; // -1
out_msg.MessageSize := MessageSizeType:Response_Control;
}
}
}
}
action(g_sendUnblock, "g", desc="Send unblock to memory") {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:UNBLOCK;
out_msg.Sender := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address, machineID));
out_msg.MessageSize := MessageSizeType:Unblock_Control;
}
}
action(gg_sendUnblockExclusive, "\g", desc="Send unblock exclusive to memory") {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:UNBLOCK_EXCLUSIVE;
out_msg.Sender := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address, machineID));
out_msg.MessageSize := MessageSizeType:Unblock_Control;
}
}
action(h_load_hit, "h", desc="Notify sequencer the load completed.") {
DEBUG_EXPR(getCacheEntry(address).DataBlk);
sequencer.readCallback(address, getCacheEntry(address).DataBlk);
}
action(hh_store_hit, "\h", desc="Notify sequencer that store completed.") {
DEBUG_EXPR(getCacheEntry(address).DataBlk);
sequencer.writeCallback(address, getCacheEntry(address).DataBlk);
getCacheEntry(address).Dirty := true;
}
action(i_allocateTBE, "i", desc="Allocate TBE") {
check_allocate(TBEs);
TBEs.allocate(address);
TBEs[address].DataBlk := getCacheEntry(address).DataBlk; // Data only used for writebacks
TBEs[address].Dirty := getCacheEntry(address).Dirty;
}
action(j_popTriggerQueue, "j", desc="Pop trigger queue.") {
triggerQueue_in.dequeue();
}
action(jj_unsetUseTimer, "\jj", desc="Unset use timer.") {
useTimerTable.unset(address);
}
action(k_popMandatoryQueue, "k", desc="Pop mandatory queue.") {
mandatoryQueue_in.dequeue();
}
action(l_popForwardQueue, "l", desc="Pop forwareded request queue.") {
requestNetwork_in.dequeue();
}
action(m_decrementNumberOfMessages, "m", desc="Decrement the number of messages for which we're waiting") {
peek(responseToL1Cache_in, ResponseMsg) {
DEBUG_EXPR("MRM_DEBUG: L1 decrementNumberOfMessages");
DEBUG_EXPR(id);
DEBUG_EXPR(in_msg.Acks);
TBEs[address].NumPendingMsgs := TBEs[address].NumPendingMsgs - in_msg.Acks;
}
}
action(mm_decrementNumberOfMessages, "\m", desc="Decrement the number of messages for which we're waiting") {
peek(requestNetwork_in, RequestMsg) {
TBEs[address].NumPendingMsgs := TBEs[address].NumPendingMsgs - in_msg.Acks;
}
}
action(n_popResponseQueue, "n", desc="Pop response queue") {
responseToL1Cache_in.dequeue();
}
action(o_checkForCompletion, "o", desc="Check if we have received all the messages required for completion") {
if (TBEs[address].NumPendingMsgs == 0) {
enqueue(triggerQueue_out, TriggerMsg) {
out_msg.Address := address;
out_msg.Type := TriggerType:ALL_ACKS;
}
}
}
action(o_scheduleUseTimeout, "oo", desc="Schedule a use timeout.") {
useTimerTable.set(address, 50);
}
action(q_sendDataFromTBEToCache, "q", desc="Send data from TBE to cache") {
peek(requestNetwork_in, RequestMsg) {
if (in_msg.RequestorMachine == MachineType:L1Cache) {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:DATA;
out_msg.Sender := machineID;
out_msg.Destination.add(in_msg.Requestor);
out_msg.DataBlk := TBEs[address].DataBlk;
// out_msg.Dirty := TBEs[address].Dirty;
out_msg.Dirty := false;
out_msg.Acks := in_msg.Acks;
out_msg.MessageSize := MessageSizeType:ResponseLocal_Data;
}
}
else {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:DATA;
out_msg.Sender := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address,machineID));
out_msg.DataBlk := TBEs[address].DataBlk;
// out_msg.Dirty := TBEs[address].Dirty;
out_msg.Dirty := false;
out_msg.Acks := in_msg.Acks;
out_msg.MessageSize := MessageSizeType:Response_Data;
}
}
}
}
action(q_sendExclusiveDataFromTBEToCache, "qq", desc="Send data from TBE to cache") {
peek(requestNetwork_in, RequestMsg) {
if (in_msg.RequestorMachine == MachineType:L1Cache) {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:DATA_EXCLUSIVE;
out_msg.Sender := machineID;
out_msg.Destination.add(in_msg.Requestor);
out_msg.DataBlk := TBEs[address].DataBlk;
out_msg.Dirty := TBEs[address].Dirty;
out_msg.Acks := in_msg.Acks;
out_msg.MessageSize := MessageSizeType:ResponseLocal_Data;
}
}
else {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Type := CoherenceResponseType:DATA_EXCLUSIVE;
out_msg.Sender := machineID;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address,machineID));
out_msg.DataBlk := TBEs[address].DataBlk;
out_msg.Dirty := TBEs[address].Dirty;
out_msg.Acks := in_msg.Acks;
out_msg.MessageSize := MessageSizeType:Response_Data;
}
}
}
}
// L2 will usually request data for a writeback
action(qq_sendWBDataFromTBEToL2, "\q", desc="Send data from TBE to L2") {
enqueue(responseNetwork_out, ResponseMsg, latency="L1_REQUEST_LATENCY") {
out_msg.Address := address;
out_msg.Sender := machineID;
out_msg.SenderMachine := MachineType:L1Cache;
out_msg.Destination.add(map_L1CacheMachId_to_L2Cache(address, machineID));
out_msg.Dirty := TBEs[address].Dirty;
if (TBEs[address].Dirty) {
out_msg.Type := CoherenceResponseType:WRITEBACK_DIRTY_DATA;
} else {
out_msg.Type := CoherenceResponseType:WRITEBACK_CLEAN_DATA;
}
out_msg.DataBlk := TBEs[address].DataBlk;
out_msg.MessageSize := MessageSizeType:Writeback_Data;
}
}
action(s_deallocateTBE, "s", desc="Deallocate TBE") {
TBEs.deallocate(address);
}
action(u_writeDataToCache, "u", desc="Write data to cache") {
peek(responseToL1Cache_in, ResponseMsg) {
getCacheEntry(address).DataBlk := in_msg.DataBlk;
getCacheEntry(address).Dirty := in_msg.Dirty;
if (in_msg.Type == CoherenceResponseType:DATA) {
//assert(in_msg.Dirty == false);
}
}
}
action(v_writeDataToCacheVerify, "v", desc="Write data to cache, assert it was same as before") {
peek(responseToL1Cache_in, ResponseMsg) {
assert(getCacheEntry(address).DataBlk == in_msg.DataBlk);
getCacheEntry(address).DataBlk := in_msg.DataBlk;
getCacheEntry(address).Dirty := in_msg.Dirty;
}
}
action(kk_deallocateL1CacheBlock, "\k", desc="Deallocate cache block. Sets the cache to invalid, allowing a replacement in parallel with a fetch.") {
if (L1DcacheMemory.isTagPresent(address)) {
L1DcacheMemory.deallocate(address);
} else {
L1IcacheMemory.deallocate(address);
}
}
action(ii_allocateL1DCacheBlock, "\i", desc="Set L1 D-cache tag equal to tag of block B.") {
if (L1DcacheMemory.isTagPresent(address) == false) {
L1DcacheMemory.allocate(address);
}
}
action(jj_allocateL1ICacheBlock, "\j", desc="Set L1 I-cache tag equal to tag of block B.") {
if (L1IcacheMemory.isTagPresent(address) == false) {
L1IcacheMemory.allocate(address);
}
}
action(uu_profileMiss, "\u", desc="Profile the demand miss") {
peek(mandatoryQueue_in, CacheMsg) {
profile_miss(in_msg, id);
}
}
action(z_recycleRequestQueue, "z", desc="Send the head of the mandatory queue to the back of the queue.") {
requestNetwork_in.recycle();
}
action(zz_recycleMandatoryQueue, "\z", desc="Send the head of the mandatory queue to the back of the queue.") {
mandatoryQueue_in.recycle();
}
//*****************************************************
// TRANSITIONS
//*****************************************************
// Transitions for Load/Store/L2_Replacement from transient states
transition({IM, SM, OM, IS, OI, SI, MI, II}, {Store, L1_Replacement}) {
zz_recycleMandatoryQueue;
}
transition({M_W, MM_W}, L1_Replacement) {
zz_recycleMandatoryQueue;
}
transition({M_W, MM_W}, {Fwd_GETS, Fwd_GETX, Own_GETX, Inv}) {
z_recycleRequestQueue;
}
transition({IM, IS, OI, MI, SI, II}, {Load, Ifetch}) {
zz_recycleMandatoryQueue;
}
// Transitions from Idle
transition(I, Load, IS) {
ii_allocateL1DCacheBlock;
i_allocateTBE;
a_issueGETS;
// uu_profileMiss;
k_popMandatoryQueue;
}
transition(I, Ifetch, IS) {
jj_allocateL1ICacheBlock;
i_allocateTBE;
a_issueGETS;
// uu_profileMiss;
k_popMandatoryQueue;
}
transition(I, Store, IM) {
ii_allocateL1DCacheBlock;
i_allocateTBE;
b_issueGETX;
// uu_profileMiss;
k_popMandatoryQueue;
}
transition(I, L1_Replacement) {
kk_deallocateL1CacheBlock;
}
transition(I, Inv) {
f_sendAck;
l_popForwardQueue;
}
// Transitions from Shared
transition({S, SM}, {Load, Ifetch}) {
h_load_hit;
k_popMandatoryQueue;
}
transition(S, Store, SM) {
i_allocateTBE;
b_issueGETX;
// uu_profileMiss;
k_popMandatoryQueue;
}
transition(S, L1_Replacement, SI) {
i_allocateTBE;
dd_issuePUTS;
kk_deallocateL1CacheBlock;
}
transition(S, Inv, I) {
f_sendAck;
l_popForwardQueue;
}
transition(S, Fwd_GETS) {
e_sendData;
l_popForwardQueue;
}
// Transitions from Owned
transition({O, OM}, {Load, Ifetch}) {
h_load_hit;
k_popMandatoryQueue;
}
transition(O, Store, OM) {
i_allocateTBE;
b_issueGETX;
// uu_profileMiss;
k_popMandatoryQueue;
}
transition(O, L1_Replacement, OI) {
i_allocateTBE;
dd_issuePUTO;
kk_deallocateL1CacheBlock;
}
transition(O, Fwd_GETX, I) {
ee_sendDataExclusive;
l_popForwardQueue;
}
transition(O, Fwd_GETS) {
e_sendData;
l_popForwardQueue;
}
// Transitions from MM
transition({MM, MM_W}, {Load, Ifetch}) {
h_load_hit;
k_popMandatoryQueue;
}
transition({MM, MM_W}, Store) {
hh_store_hit;
k_popMandatoryQueue;
}
transition(MM, L1_Replacement, MI) {
i_allocateTBE;
d_issuePUTX;
kk_deallocateL1CacheBlock;
}
transition(MM, Fwd_GETX, I) {
ee_sendDataExclusive;
l_popForwardQueue;
}
transition(MM, Fwd_GETS, I) {
ee_sendDataExclusive;
l_popForwardQueue;
}
// Transitions from M
transition({M, M_W}, {Load, Ifetch}) {
h_load_hit;
k_popMandatoryQueue;
}
transition(M, Store, MM) {
hh_store_hit;
k_popMandatoryQueue;
}
transition(M_W, Store, MM_W) {
hh_store_hit;
k_popMandatoryQueue;
}
transition(M, L1_Replacement, MI) {
i_allocateTBE;
d_issuePUTX;
kk_deallocateL1CacheBlock;
}
transition(M, Fwd_GETX, I) {
// e_sendData;
ee_sendDataExclusive;
l_popForwardQueue;
}
transition(M, Fwd_GETS, O) {
e_sendData;
l_popForwardQueue;
}
// Transitions from IM
transition(IM, Inv) {
f_sendAck;
l_popForwardQueue;
}
transition(IM, Ack) {
m_decrementNumberOfMessages;
o_checkForCompletion;
n_popResponseQueue;
}
transition(IM, {Exclusive_Data, Data}, OM) {
u_writeDataToCache;
m_decrementNumberOfMessages;
o_checkForCompletion;
n_popResponseQueue;
}
// Transitions from SM
transition(SM, Inv, IM) {
f_sendAck;
l_popForwardQueue;
}
transition(SM, Ack) {
m_decrementNumberOfMessages;
o_checkForCompletion;
n_popResponseQueue;
}
transition(SM, {Data, Exclusive_Data}, OM) {
// v_writeDataToCacheVerify;
m_decrementNumberOfMessages;
o_checkForCompletion;
n_popResponseQueue;
}
transition(SM, Fwd_GETS) {
e_sendData;
l_popForwardQueue;
}
// Transitions from OM
transition(OM, Own_GETX) {
mm_decrementNumberOfMessages;
o_checkForCompletion;
l_popForwardQueue;
}
// transition(OM, Fwd_GETX, OMF) {
transition(OM, Fwd_GETX, IM) {
ee_sendDataExclusive;
l_popForwardQueue;
}
transition(OM, Fwd_GETS, OM) {
e_sendData;
l_popForwardQueue;
}
//transition({OM, OMF}, Ack) {
transition(OM, Ack) {
m_decrementNumberOfMessages;
o_checkForCompletion;
n_popResponseQueue;
}
transition(OM, All_acks, MM_W) {
hh_store_hit;
gg_sendUnblockExclusive;
s_deallocateTBE;
o_scheduleUseTimeout;
j_popTriggerQueue;
}
transition(MM_W, Use_Timeout, MM) {
jj_unsetUseTimer;
}
// Transitions from IS
transition(IS, Inv) {
f_sendAck;
l_popForwardQueue;
}
transition(IS, Data, S) {
u_writeDataToCache;
m_decrementNumberOfMessages;
h_load_hit;
g_sendUnblock;
s_deallocateTBE;
n_popResponseQueue;
}
transition(IS, Exclusive_Data, M_W) {
u_writeDataToCache;
m_decrementNumberOfMessages;
h_load_hit;
gg_sendUnblockExclusive;
o_scheduleUseTimeout;
s_deallocateTBE;
n_popResponseQueue;
}
transition(M_W, Use_Timeout, M) {
jj_unsetUseTimer;
}
// Transitions from OI/MI
transition(MI, Fwd_GETS, OI) {
q_sendDataFromTBEToCache;
l_popForwardQueue;
}
transition(MI, Fwd_GETX, II) {
q_sendExclusiveDataFromTBEToCache;
l_popForwardQueue;
}
transition({SI, OI}, Fwd_GETS) {
q_sendDataFromTBEToCache;
l_popForwardQueue;
}
transition(OI, Fwd_GETX, II) {
q_sendExclusiveDataFromTBEToCache;
l_popForwardQueue;
}
transition({SI, OI, MI}, Writeback_Ack_Data, I) {
qq_sendWBDataFromTBEToL2; // always send data
s_deallocateTBE;
l_popForwardQueue;
}
transition({SI, OI, MI}, Writeback_Ack, I) {
g_sendUnblock;
s_deallocateTBE;
l_popForwardQueue;
}
transition({MI, OI}, Writeback_Nack, OI) {
// FIXME: This might cause deadlock by re-using the writeback
// channel, we should handle this case differently.
dd_issuePUTO;
l_popForwardQueue;
}
// Transitions from II
transition(II, {Writeback_Ack, Writeback_Ack_Data}, I) {
g_sendUnblock;
s_deallocateTBE;
l_popForwardQueue;
}
// transition({II, SI}, Writeback_Nack, I) {
transition(II, Writeback_Nack, I) {
s_deallocateTBE;
l_popForwardQueue;
}
transition(SI, Writeback_Nack) {
dd_issuePUTS;
l_popForwardQueue;
}
transition(II, Inv) {
f_sendAck;
l_popForwardQueue;
}
transition(SI, Inv, II) {
f_sendAck;
l_popForwardQueue;
}
}
Reference in a new issue Copy permalink