MessageBuffer forwardFromDir, network="To", virtual_network="2", ordered="false";
MessageBuffer responseFromDir, network="To", virtual_network="1", ordered="false";
- //MessageBuffer dmaRequestFromDir, network="To", virtual_network="4", ordered="true";
+ //
+ // For a finite buffered network, note that the DMA response network only
+ // works at this relatively higher numbered (lower priority) virtual network
+ // because the trigger queue decouples cache responses from DMA responses.
+ //
+ MessageBuffer dmaResponseFromDir, network="To", virtual_network="4", ordered="true";
- MessageBuffer requestToDir, network="From", virtual_network="3", ordered="false";
MessageBuffer unblockToDir, network="From", virtual_network="0", ordered="false";
- //MessageBuffer dmaRequestToDir, network="From", virtual_network="5", ordered="true";
+ MessageBuffer responseToDir, network="From", virtual_network="1", ordered="false";
+ MessageBuffer requestToDir, network="From", virtual_network="3", ordered="false";
+ MessageBuffer dmaRequestToDir, network="From", virtual_network="5", ordered="true";
// STATES
enumeration(State, desc="Directory states", default="Directory_State_E") {
O_B_W, desc="Owner, Blocked, waiting for Dram";
NO_W, desc="Not Owner, waiting for Dram";
O_W, desc="Owner, waiting for Dram";
+ NO_DW_B_W, desc="Not Owner, Dma Write waiting for Dram and cache responses";
+ NO_DR_B_W, desc="Not Owner, Dma Read waiting for Dram and cache responses";
+ NO_DR_B_D, desc="Not Owner, Dma Read waiting for cache responses including dirty data";
+ NO_DR_B, desc="Not Owner, Dma Read waiting for cache responses";
+ NO_DW_W, desc="Not Owner, Dma Write waiting for Dram";
+ O_DR_B_W, desc="Owner, Dma Read waiting for Dram and cache responses";
+ O_DR_B, desc="Owner, Dma Read waiting for cache responses";
WB, desc="Blocked on a writeback";
WB_O_W, desc="Blocked on memory write, will go to O";
WB_E_W, desc="Blocked on memory write, will go to E";
Writeback_Exclusive_Clean, desc="The final part of a PutX (no data, exclusive)";
Writeback_Exclusive_Dirty, desc="The final part of a PutX (data, exclusive)";
+ // DMA requests
+ DMA_READ, desc="A DMA Read memory request";
+ DMA_WRITE, desc="A DMA Write memory request";
+
// Memory Controller
Memory_Data, desc="Fetched data from memory arrives";
Memory_Ack, desc="Writeback Ack from memory arrives";
+
+ // Cache responses required to handle DMA
+ Ack, desc="Received an ack message";
+ Shared_Ack, desc="Received an ack message, responder has a shared copy";
+ Shared_Data, desc="Received a data message, responder has a shared copy";
+ Exclusive_Data, desc="Received a data message, responder had an exclusive copy, they gave it to us";
+
+ // Triggers
+ All_acks_and_data, desc="Received all required data and message acks";
+ All_acks_and_data_no_sharers, desc="Received all acks and no other processor has a shared copy";
}
// TYPES
Address PhysicalAddress, desc="physical address";
State TBEState, desc="Transient State";
CoherenceResponseType ResponseType, desc="The type for the subsequent response message";
- DataBlock DataBlk, desc="Data to be written (DMA write only)";
+ DataBlock DmaDataBlk, desc="DMA Data to be written. Partial blocks need to merged with system memory";
+ DataBlock DataBlk, desc="The current view of system memory";
int Len, desc="...";
MachineID DmaRequestor, desc="DMA requestor";
+ int NumPendingMsgs, desc="Number of pending acks/messages";
+ bool CacheDirty, desc="Indicates whether a cache has responded with dirty data";
+ bool Sharers, desc="Indicates whether a cache has indicated it is currently a sharer";
}
external_type(TBETable) {
directory[addr].DirectoryState := state;
}
+ MessageBuffer triggerQueue, ordered="true";
+
// ** OUT_PORTS **
+ out_port(requestQueue_out, ResponseMsg, requestToDir); // For recycling requests
out_port(forwardNetwork_out, RequestMsg, forwardFromDir);
out_port(responseNetwork_out, ResponseMsg, responseFromDir);
- out_port(requestQueue_out, ResponseMsg, requestToDir); // For recycling requests
+ out_port(dmaResponseNetwork_out, DMAResponseMsg, dmaResponseFromDir);
+ out_port(triggerQueue_out, TriggerMsg, triggerQueue);
//
// Memory buffer for memory controller to DIMM communication
// ** IN_PORTS **
+ // 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_and_data, in_msg.Address);
+ } else if (in_msg.Type == TriggerType:ALL_ACKS_NO_SHARERS) {
+ trigger(Event:All_acks_and_data_no_sharers, in_msg.Address);
+ } else {
+ error("Unexpected message");
+ }
+ }
+ }
+ }
+
in_port(unblockNetwork_in, ResponseMsg, unblockToDir) {
if (unblockNetwork_in.isReady()) {
peek(unblockNetwork_in, ResponseMsg) {
}
}
+ // Response Network
+ in_port(responseToDir_in, ResponseMsg, responseToDir) {
+ if (responseToDir_in.isReady()) {
+ peek(responseToDir_in, ResponseMsg) {
+ if (in_msg.Type == CoherenceResponseType:ACK) {
+ trigger(Event:Ack, in_msg.Address);
+ } else if (in_msg.Type == CoherenceResponseType:ACK_SHARED) {
+ trigger(Event:Shared_Ack, in_msg.Address);
+ } else if (in_msg.Type == CoherenceResponseType:DATA_SHARED) {
+ trigger(Event:Shared_Data, in_msg.Address);
+ } else if (in_msg.Type == CoherenceResponseType:DATA_EXCLUSIVE) {
+ trigger(Event:Exclusive_Data, in_msg.Address);
+ } else {
+ error("Unexpected message");
+ }
+ }
+ }
+ }
+
+ in_port(dmaRequestQueue_in, DMARequestMsg, dmaRequestToDir) {
+ if (dmaRequestQueue_in.isReady()) {
+ peek(dmaRequestQueue_in, DMARequestMsg) {
+ if (in_msg.Type == DMARequestType:READ) {
+ trigger(Event:DMA_READ, in_msg.LineAddress);
+ } else if (in_msg.Type == DMARequestType:WRITE) {
+ trigger(Event:DMA_WRITE, in_msg.LineAddress);
+ } else {
+ error("Invalid message");
+ }
+ }
+ }
+ }
+
in_port(requestQueue_in, RequestMsg, requestToDir) {
if (requestQueue_in.isReady()) {
peek(requestQueue_in, RequestMsg) {
}
}
+ action(vd_allocateDmaRequestInTBE, "vd", desc="Record Data in TBE") {
+ peek(dmaRequestQueue_in, DMARequestMsg) {
+ TBEs.allocate(address);
+ TBEs[address].DmaDataBlk := in_msg.DataBlk;
+ TBEs[address].PhysicalAddress := in_msg.PhysicalAddress;
+ TBEs[address].Len := in_msg.Len;
+ TBEs[address].DmaRequestor := in_msg.Requestor;
+ TBEs[address].ResponseType := CoherenceResponseType:DATA_EXCLUSIVE;
+ //
+ // One ack for each last-level cache
+ //
+ TBEs[address].NumPendingMsgs := getNumberOfLastLevelCaches();
+ //
+ // Assume initially that the caches store a clean copy and that memory
+ // will provide the data
+ //
+ TBEs[address].CacheDirty := false;
+ }
+ }
+
action(w_deallocateTBE, "w", desc="Deallocate TBE") {
TBEs.deallocate(address);
}
+ action(m_decrementNumberOfMessages, "m", desc="Decrement the number of messages for which we're waiting") {
+ peek(responseToDir_in, ResponseMsg) {
+ assert(in_msg.Acks > 0);
+ DEBUG_EXPR(TBEs[address].NumPendingMsgs);
+ //
+ // Note that cache data responses will have an ack count of 2. However,
+ // directory DMA requests must wait for acks from all LLC caches, so
+ // only decrement by 1.
+ //
+ TBEs[address].NumPendingMsgs := TBEs[address].NumPendingMsgs - 1;
+ DEBUG_EXPR(TBEs[address].NumPendingMsgs);
+ }
+ }
+
+ action(n_popResponseQueue, "n", desc="Pop response queue") {
+ responseToDir_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;
+ if (TBEs[address].Sharers) {
+ out_msg.Type := TriggerType:ALL_ACKS;
+ } else {
+ out_msg.Type := TriggerType:ALL_ACKS_NO_SHARERS;
+ }
+ }
+ }
+ }
+
action(d_sendData, "d", desc="Send data to requestor") {
peek(memQueue_in, MemoryMsg) {
enqueue(responseNetwork_out, ResponseMsg, latency="1") {
}
}
+ action(dr_sendDmaData, "dr", desc="Send Data to DMA controller from memory") {
+ peek(memQueue_in, MemoryMsg) {
+ enqueue(dmaResponseNetwork_out, DMAResponseMsg, latency="1") {
+ out_msg.PhysicalAddress := address;
+ out_msg.LineAddress := address;
+ out_msg.Type := DMAResponseType:DATA;
+ //
+ // we send the entire data block and rely on the dma controller to
+ // split it up if need be
+ //
+ out_msg.DataBlk := in_msg.DataBlk;
+ out_msg.Destination.add(TBEs[address].DmaRequestor);
+ out_msg.MessageSize := MessageSizeType:Response_Data;
+ }
+ }
+ }
+
+ action(dt_sendDmaDataFromTbe, "dt", desc="Send Data to DMA controller from tbe") {
+ peek(triggerQueue_in, TriggerMsg) {
+ enqueue(dmaResponseNetwork_out, DMAResponseMsg, latency="1") {
+ out_msg.PhysicalAddress := address;
+ out_msg.LineAddress := address;
+ out_msg.Type := DMAResponseType:DATA;
+ //
+ // we send the entire data block and rely on the dma controller to
+ // split it up if need be
+ //
+ out_msg.DataBlk := TBEs[address].DataBlk;
+ out_msg.Destination.add(TBEs[address].DmaRequestor);
+ out_msg.MessageSize := MessageSizeType:Response_Data;
+ }
+ }
+ }
+
+ action(da_sendDmaAck, "da", desc="Send Ack to DMA controller") {
+ enqueue(dmaResponseNetwork_out, DMAResponseMsg, latency="1") {
+ out_msg.PhysicalAddress := address;
+ out_msg.LineAddress := address;
+ out_msg.Type := DMAResponseType:ACK;
+ out_msg.Destination.add(TBEs[address].DmaRequestor);
+ out_msg.MessageSize := MessageSizeType:Writeback_Control;
+ }
+ }
+
action(rx_recordExclusiveInTBE, "rx", desc="Record Exclusive in TBE") {
peek(requestQueue_in, RequestMsg) {
TBEs[address].ResponseType := CoherenceResponseType:DATA_EXCLUSIVE;
}
}
- action(r_recordDataInTBE, "r", desc="Record Data in TBE") {
+ action(r_recordDataInTBE, "rt", desc="Record Data in TBE") {
peek(requestQueue_in, RequestMsg) {
TBEs[address].ResponseType := CoherenceResponseType:DATA;
}
}
+ action(r_setSharerBit, "r", desc="We saw other sharers") {
+ TBEs[address].Sharers := true;
+ }
+
action(qf_queueMemoryFetchRequest, "qf", desc="Queue off-chip fetch request") {
peek(requestQueue_in, RequestMsg) {
enqueue(memQueue_out, MemoryMsg, latency="1") {
out_msg.Sender := machineID;
out_msg.OriginalRequestorMachId := in_msg.Requestor;
out_msg.MessageSize := in_msg.MessageSize;
- out_msg.DataBlk := directory[in_msg.Address].DataBlk;
+ out_msg.DataBlk := directory[address].DataBlk;
DEBUG_EXPR(out_msg);
}
}
}
-// action(qx_queueMemoryFetchExclusiveRequest, "xf", desc="Queue off-chip fetch request") {
-// peek(requestQueue_in, RequestMsg) {
-// enqueue(memQueue_out, MemoryMsg, latency=memory_request_latency) {
-// out_msg.Address := address;
-// out_msg.Type := MemoryRequestType:MEMORY_READ;
-// out_msg.ResponseType := CoherenceResponseType:DATA_EXCLUSIVE;
-// out_msg.Sender := machineID;
-// out_msg.OriginalRequestorMachId := in_msg.Requestor;
-// out_msg.MessageSize := in_msg.MessageSize;
-// out_msg.DataBlk := directory[in_msg.Address].DataBlk;
-// DEBUG_EXPR(out_msg);
-// }
-// }
-// }
-
-// action(d_sendData, "d", desc="Send data to requestor") {
-// peek(requestQueue_in, RequestMsg) {
-// enqueue(responseNetwork_out, ResponseMsg, latency=memory_latency) {
-// out_msg.Address := address;
-// out_msg.Type := CoherenceResponseType:DATA;
-// out_msg.Sender := machineID;
-// out_msg.Destination.add(in_msg.Requestor);
-// out_msg.DataBlk := directory[in_msg.Address].DataBlk;
-// out_msg.Dirty := false; // By definition, the block is now clean
-// out_msg.Acks := 1;
-// out_msg.MessageSize := MessageSizeType:Response_Data;
-// }
-// }
-// }
-
-// action(dd_sendExclusiveData, "\d", desc="Send exclusive data to requestor") {
-// peek(requestQueue_in, RequestMsg) {
-// enqueue(responseNetwork_out, ResponseMsg, latency=memory_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 := directory[in_msg.Address].DataBlk;
-// out_msg.Dirty := false; // By definition, the block is now clean
-// out_msg.Acks := 1;
-// out_msg.MessageSize := MessageSizeType:Response_Data;
-// }
-// }
-// }
+ action(qd_queueMemoryRequestFromDmaRead, "qd", desc="Queue off-chip fetch request") {
+ peek(dmaRequestQueue_in, DMARequestMsg) {
+ enqueue(memQueue_out, MemoryMsg, latency="1") {
+ out_msg.Address := address;
+ out_msg.Type := MemoryRequestType:MEMORY_READ;
+ out_msg.Sender := machineID;
+ out_msg.OriginalRequestorMachId := in_msg.Requestor;
+ out_msg.MessageSize := in_msg.MessageSize;
+ out_msg.DataBlk := directory[address].DataBlk;
+ DEBUG_EXPR(out_msg);
+ }
+ }
+ }
action(f_forwardRequest, "f", desc="Forward requests") {
if (getNumberOfLastLevelCaches() > 1) {
}
}
+ action(f_forwardWriteFromDma, "fw", desc="Forward requests") {
+ peek(dmaRequestQueue_in, DMARequestMsg) {
+ enqueue(forwardNetwork_out, RequestMsg, latency=memory_controller_latency) {
+ out_msg.Address := address;
+ out_msg.Type := CoherenceRequestType:GETX;
+ //
+ // Send to all L1 caches, since the requestor is the memory controller
+ // itself
+ //
+ out_msg.Requestor := machineID;
+ out_msg.Destination.broadcast(MachineType:L1Cache);
+ out_msg.MessageSize := MessageSizeType:Forwarded_Control;
+ }
+ }
+ }
+
+ action(f_forwardReadFromDma, "fr", desc="Forward requests") {
+ peek(dmaRequestQueue_in, DMARequestMsg) {
+ enqueue(forwardNetwork_out, RequestMsg, latency=memory_controller_latency) {
+ out_msg.Address := address;
+ out_msg.Type := CoherenceRequestType:GETS;
+ //
+ // Send to all L1 caches, since the requestor is the memory controller
+ // itself
+ //
+ out_msg.Requestor := machineID;
+ out_msg.Destination.broadcast(MachineType:L1Cache);
+ out_msg.MessageSize := MessageSizeType:Forwarded_Control;
+ }
+ }
+ }
+
action(i_popIncomingRequestQueue, "i", desc="Pop incoming request queue") {
requestQueue_in.dequeue();
}
memQueue_in.dequeue();
}
+ action(g_popTriggerQueue, "g", desc="Pop trigger queue") {
+ triggerQueue_in.dequeue();
+ }
+
+ action(p_popDmaRequestQueue, "pd", desc="pop dma request queue") {
+ dmaRequestQueue_in.dequeue();
+ }
+
+ action(y_recycleDmaRequestQueue, "y", desc="recycle dma request queue") {
+ dmaRequestQueue_in.recycle();
+ }
+
+ action(r_recordMemoryData, "rd", desc="record data from memory to TBE") {
+ peek(memQueue_in, MemoryMsg) {
+ if (TBEs[address].CacheDirty == false) {
+ TBEs[address].DataBlk := in_msg.DataBlk;
+ }
+ }
+ }
+
+ action(r_recordCacheData, "rc", desc="record data from cache response to TBE") {
+ peek(responseToDir_in, ResponseMsg) {
+ TBEs[address].CacheDirty := true;
+ TBEs[address].DataBlk := in_msg.DataBlk;
+ }
+ }
+
action(l_writeDataToMemory, "l", desc="Write PUTX/PUTO data to memory") {
peek(unblockNetwork_in, ResponseMsg) {
assert(in_msg.Dirty);
assert(in_msg.MessageSize == MessageSizeType:Writeback_Data);
- directory[in_msg.Address].DataBlk := in_msg.DataBlk;
+ directory[address].DataBlk := in_msg.DataBlk;
DEBUG_EXPR(in_msg.Address);
DEBUG_EXPR(in_msg.DataBlk);
}
}
+ action(dwt_writeDmaDataFromTBE, "dwt", desc="DMA Write data to memory from TBE") {
+ directory[address].DataBlk := TBEs[address].DataBlk;
+ directory[address].DataBlk.copyPartial(TBEs[address].DmaDataBlk, addressOffset(TBEs[address].PhysicalAddress), TBEs[address].Len);
+ }
+
+ action(a_assertCacheData, "ac", desc="Assert that a cache provided the data") {
+ assert(TBEs[address].CacheDirty);
+ }
+
action(l_queueMemoryWBRequest, "lq", desc="Write PUTX data to memory") {
peek(unblockNetwork_in, ResponseMsg) {
enqueue(memQueue_out, MemoryMsg, latency="1") {
}
}
+ action(ld_queueMemoryDmaWrite, "ld", desc="Write DMA data to memory") {
+ enqueue(memQueue_out, MemoryMsg, latency="1") {
+ out_msg.Address := address;
+ out_msg.Type := MemoryRequestType:MEMORY_WB;
+ // first, initialize the data blk to the current version of system memory
+ out_msg.DataBlk := TBEs[address].DataBlk;
+ // then add the dma write data
+ out_msg.DataBlk.copyPartial(TBEs[address].DmaDataBlk, addressOffset(TBEs[address].PhysicalAddress), TBEs[address].Len);
+ DEBUG_EXPR(out_msg);
+ }
+ }
+
action(ll_checkIncomingWriteback, "\l", desc="Check PUTX/PUTO response message") {
peek(unblockNetwork_in, ResponseMsg) {
assert(in_msg.Dirty == false);
// implementation. We include the data in the "dataless"
// message so we can assert the clean data matches the datablock
// in memory
- assert(directory[in_msg.Address].DataBlk == in_msg.DataBlk);
+ assert(directory[address].DataBlk == in_msg.DataBlk);
}
}
- // action(z_stall, "z", desc="Cannot be handled right now.") {
- // Special name recognized as do nothing case
- // }
-
action(zz_recycleRequest, "\z", desc="Recycle the request queue") {
requestQueue_in.recycle();
}
// TRANSITIONS
+ // Transitions out of E state
transition(E, GETX, NO_B_W) {
v_allocateTBE;
rx_recordExclusiveInTBE;
i_popIncomingRequestQueue;
}
- //
+ transition(E, DMA_READ, NO_DR_B_W) {
+ vd_allocateDmaRequestInTBE;
+ qd_queueMemoryRequestFromDmaRead;
+ f_forwardReadFromDma;
+ p_popDmaRequestQueue;
+ }
+
+ // Transitions out of O state
transition(O, GETX, NO_B_W) {
v_allocateTBE;
r_recordDataInTBE;
i_popIncomingRequestQueue;
}
- //
+ transition(O, DMA_READ, O_DR_B_W) {
+ vd_allocateDmaRequestInTBE;
+ qd_queueMemoryRequestFromDmaRead;
+ f_forwardReadFromDma;
+ p_popDmaRequestQueue;
+ }
+
+ transition({E, O, NO}, DMA_WRITE, NO_DW_B_W) {
+ vd_allocateDmaRequestInTBE;
+ f_forwardWriteFromDma;
+ p_popDmaRequestQueue;
+ }
+
+ // Transitions out of NO state
transition(NO, GETX, NO_B) {
f_forwardRequest;
i_popIncomingRequestQueue;
i_popIncomingRequestQueue;
}
+ transition(NO, DMA_READ, NO_DR_B_D) {
+ vd_allocateDmaRequestInTBE;
+ f_forwardReadFromDma;
+ p_popDmaRequestQueue;
+ }
+
+ // Nack PUT requests when races cause us to believe we own the data
transition({O, E}, PUT) {
b_sendWriteBackNack;
i_popIncomingRequestQueue;
}
- // Blocked states
- transition({NO_B, O_B, NO_B_W, O_B_W, NO_W, O_W, WB, WB_E_W, WB_O_W}, {GETS, GETX, PUT}) {
+ // Blocked transient states
+ transition({NO_B, O_B, NO_DR_B_W, NO_DW_B_W, NO_B_W, NO_DR_B_D,
+ NO_DR_B, O_DR_B, O_B_W, O_DR_B_W, NO_DW_W,
+ NO_W, O_W, WB, WB_E_W, WB_O_W},
+ {GETS, GETX, PUT}) {
zz_recycleRequest;
}
+ transition({NO_B, O_B, NO_DR_B_W, NO_DW_B_W, NO_B_W, NO_DR_B_D,
+ NO_DR_B, O_DR_B, O_B_W, O_DR_B_W, NO_DW_W,
+ NO_W, O_W, WB, WB_E_W, WB_O_W},
+ {DMA_READ, DMA_WRITE}) {
+ y_recycleDmaRequestQueue;
+ }
+
transition(NO_B, Unblock, NO) {
j_popIncomingUnblockQueue;
}
l_popMemQueue;
}
+ transition(NO_DR_B_W, Memory_Data, NO_DR_B) {
+ r_recordMemoryData;
+ o_checkForCompletion;
+ l_popMemQueue;
+ }
+
+ transition(O_DR_B_W, Memory_Data, O_DR_B) {
+ r_recordMemoryData;
+ dr_sendDmaData;
+ o_checkForCompletion;
+ l_popMemQueue;
+ }
+
+ transition({NO_DR_B, O_DR_B, NO_DR_B_D, NO_DW_B_W}, Ack) {
+ m_decrementNumberOfMessages;
+ o_checkForCompletion;
+ n_popResponseQueue;
+ }
+
+ transition(NO_DR_B_W, Ack) {
+ m_decrementNumberOfMessages;
+ n_popResponseQueue;
+ }
+
+ transition(NO_DR_B_W, Shared_Ack) {
+ m_decrementNumberOfMessages;
+ r_setSharerBit;
+ n_popResponseQueue;
+ }
+
+ transition({NO_DR_B, NO_DR_B_D}, Shared_Ack) {
+ m_decrementNumberOfMessages;
+ r_setSharerBit;
+ o_checkForCompletion;
+ n_popResponseQueue;
+ }
+
+ transition(NO_DR_B_W, Shared_Data) {
+ r_recordCacheData;
+ m_decrementNumberOfMessages;
+ r_setSharerBit;
+ o_checkForCompletion;
+ n_popResponseQueue;
+ }
+
+ transition({NO_DR_B, NO_DR_B_D}, Shared_Data) {
+ r_recordCacheData;
+ m_decrementNumberOfMessages;
+ r_setSharerBit;
+ o_checkForCompletion;
+ n_popResponseQueue;
+ }
+
+ transition(NO_DR_B_W, Exclusive_Data) {
+ r_recordCacheData;
+ m_decrementNumberOfMessages;
+ n_popResponseQueue;
+ }
+
+ transition({NO_DR_B, NO_DR_B_D, NO_DW_B_W}, Exclusive_Data) {
+ r_recordCacheData;
+ m_decrementNumberOfMessages;
+ o_checkForCompletion;
+ n_popResponseQueue;
+ }
+
+ transition(NO_DR_B, All_acks_and_data, O) {
+ //
+ // Note that the DMA consistency model allows us to send the DMA device
+ // a response as soon as we receive valid data and prior to receiving
+ // all acks. However, to simplify the protocol we wait for all acks.
+ //
+ dt_sendDmaDataFromTbe;
+ w_deallocateTBE;
+ g_popTriggerQueue;
+ }
+
+ transition(NO_DR_B_D, All_acks_and_data, O) {
+ //
+ // Note that the DMA consistency model allows us to send the DMA device
+ // a response as soon as we receive valid data and prior to receiving
+ // all acks. However, to simplify the protocol we wait for all acks.
+ //
+ dt_sendDmaDataFromTbe;
+ w_deallocateTBE;
+ g_popTriggerQueue;
+ }
+
+ transition(O_DR_B, All_acks_and_data_no_sharers, O) {
+ w_deallocateTBE;
+ g_popTriggerQueue;
+ }
+
+ transition(NO_DR_B, All_acks_and_data_no_sharers, E) {
+ //
+ // Note that the DMA consistency model allows us to send the DMA device
+ // a response as soon as we receive valid data and prior to receiving
+ // all acks. However, to simplify the protocol we wait for all acks.
+ //
+ dt_sendDmaDataFromTbe;
+ w_deallocateTBE;
+ g_popTriggerQueue;
+ }
+
+ transition(NO_DR_B_D, All_acks_and_data_no_sharers, E) {
+ a_assertCacheData;
+ //
+ // Note that the DMA consistency model allows us to send the DMA device
+ // a response as soon as we receive valid data and prior to receiving
+ // all acks. However, to simplify the protocol we wait for all acks.
+ //
+ dt_sendDmaDataFromTbe;
+ w_deallocateTBE;
+ g_popTriggerQueue;
+ }
+
+ transition(NO_DW_B_W, All_acks_and_data_no_sharers, NO_DW_W) {
+ dwt_writeDmaDataFromTBE;
+ ld_queueMemoryDmaWrite;
+ g_popTriggerQueue;
+ }
+
+ transition(NO_DW_W, Memory_Ack, E) {
+ da_sendDmaAck;
+ w_deallocateTBE;
+ l_popMemQueue;
+ }
+
transition(O_B_W, Memory_Data, O_B) {
d_sendData;
w_deallocateTBE;
l_popMemQueue;
}
- // WB
+ // WB State Transistions
transition(WB, Writeback_Dirty, WB_E_W) {
l_writeDataToMemory;
l_queueMemoryWBRequest;
--- /dev/null
+/*
+ * 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.
+ */
+
+
+machine(DMA, "DMA Controller")
+: int request_latency
+{
+
+ MessageBuffer responseFromDir, network="From", virtual_network="4", ordered="true", no_vector="true";
+ MessageBuffer reqToDirectory, network="To", virtual_network="5", ordered="false", no_vector="true";
+
+ enumeration(State, desc="DMA states", default="DMA_State_READY") {
+ READY, desc="Ready to accept a new request";
+ BUSY_RD, desc="Busy: currently processing a request";
+ BUSY_WR, desc="Busy: currently processing a request";
+ }
+
+ enumeration(Event, desc="DMA events") {
+ ReadRequest, desc="A new read request";
+ WriteRequest, desc="A new write request";
+ Data, desc="Data from a DMA memory read";
+ Ack, desc="DMA write to memory completed";
+ }
+
+ external_type(DMASequencer) {
+ void ackCallback();
+ void dataCallback(DataBlock);
+ }
+
+ MessageBuffer mandatoryQueue, ordered="false", no_vector="true";
+ DMASequencer dma_sequencer, factory='RubySystem::getDMASequencer(m_cfg["dma_sequencer"])', no_vector="true";
+ State cur_state, no_vector="true";
+
+ State getState(Address addr) {
+ return cur_state;
+ }
+ void setState(Address addr, State state) {
+ cur_state := state;
+ }
+
+ out_port(reqToDirectory_out, DMARequestMsg, reqToDirectory, desc="...");
+
+ in_port(dmaRequestQueue_in, SequencerMsg, mandatoryQueue, desc="...") {
+ if (dmaRequestQueue_in.isReady()) {
+ peek(dmaRequestQueue_in, SequencerMsg) {
+ if (in_msg.Type == SequencerRequestType:LD ) {
+ trigger(Event:ReadRequest, in_msg.LineAddress);
+ } else if (in_msg.Type == SequencerRequestType:ST) {
+ trigger(Event:WriteRequest, in_msg.LineAddress);
+ } else {
+ error("Invalid request type");
+ }
+ }
+ }
+ }
+
+ in_port(dmaResponseQueue_in, DMAResponseMsg, responseFromDir, desc="...") {
+ if (dmaResponseQueue_in.isReady()) {
+ peek( dmaResponseQueue_in, DMAResponseMsg) {
+ if (in_msg.Type == DMAResponseType:ACK) {
+ trigger(Event:Ack, in_msg.LineAddress);
+ } else if (in_msg.Type == DMAResponseType:DATA) {
+ trigger(Event:Data, in_msg.LineAddress);
+ } else {
+ error("Invalid response type");
+ }
+ }
+ }
+ }
+
+ action(s_sendReadRequest, "s", desc="Send a DMA read request to memory") {
+ peek(dmaRequestQueue_in, SequencerMsg) {
+ enqueue(reqToDirectory_out, DMARequestMsg, latency=request_latency) {
+ out_msg.PhysicalAddress := in_msg.PhysicalAddress;
+ out_msg.LineAddress := in_msg.LineAddress;
+ out_msg.Type := DMARequestType:READ;
+ out_msg.Requestor := machineID;
+ out_msg.DataBlk := in_msg.DataBlk;
+ out_msg.Len := in_msg.Len;
+ out_msg.Destination.add(map_Address_to_Directory(address));
+ out_msg.MessageSize := MessageSizeType:Writeback_Control;
+ }
+ }
+ }
+
+ action(s_sendWriteRequest, "\s", desc="Send a DMA write request to memory") {
+ peek(dmaRequestQueue_in, SequencerMsg) {
+ enqueue(reqToDirectory_out, DMARequestMsg, latency=request_latency) {
+ out_msg.PhysicalAddress := in_msg.PhysicalAddress;
+ out_msg.LineAddress := in_msg.LineAddress;
+ out_msg.Type := DMARequestType:WRITE;
+ out_msg.Requestor := machineID;
+ out_msg.DataBlk := in_msg.DataBlk;
+ out_msg.Len := in_msg.Len;
+ out_msg.Destination.add(map_Address_to_Directory(address));
+ out_msg.MessageSize := MessageSizeType:Writeback_Control;
+ }
+ }
+ }
+
+ action(a_ackCallback, "a", desc="Notify dma controller that write request completed") {
+ peek (dmaResponseQueue_in, DMAResponseMsg) {
+ dma_sequencer.ackCallback();
+ }
+ }
+
+ action(d_dataCallback, "d", desc="Write data to dma sequencer") {
+ peek (dmaResponseQueue_in, DMAResponseMsg) {
+ dma_sequencer.dataCallback(in_msg.DataBlk);
+ }
+ }
+
+ action(p_popRequestQueue, "p", desc="Pop request queue") {
+ dmaRequestQueue_in.dequeue();
+ }
+
+ action(p_popResponseQueue, "\p", desc="Pop request queue") {
+ dmaResponseQueue_in.dequeue();
+ }
+
+ transition(READY, ReadRequest, BUSY_RD) {
+ s_sendReadRequest;
+ p_popRequestQueue;
+ }
+
+ transition(READY, WriteRequest, BUSY_WR) {
+ s_sendWriteRequest;
+ p_popRequestQueue;
+ }
+
+ transition(BUSY_RD, Data, READY) {
+ d_dataCallback;
+ p_popResponseQueue;
+ }
+
+ transition(BUSY_WR, Ack, READY) {
+ a_ackCallback;
+ p_popResponseQueue;
+ }
+}
projects / gem5.git / commitdiff